-/*\r
- This is a version (aka dlmalloc) of malloc/free/realloc written by\r
- Doug Lea and released to the public domain, as explained at\r
- http://creativecommons.org/publicdomain/zero/1.0/ Send questions,\r
- comments, complaints, performance data, etc to dl@cs.oswego.edu\r
-\r
-* Version 2.8.5 Sun May 22 10:26:02 2011 Doug Lea (dl at gee)\r
-\r
- Note: There may be an updated version of this malloc obtainable at\r
- ftp://gee.cs.oswego.edu/pub/misc/malloc.c\r
- Check before installing!\r
-\r
-* Quickstart\r
-\r
- This library is all in one file to simplify the most common usage:\r
- ftp it, compile it (-O3), and link it into another program. All of\r
- the compile-time options default to reasonable values for use on\r
- most platforms. You might later want to step through various\r
- compile-time and dynamic tuning options.\r
-\r
- For convenience, an include file for code using this malloc is at:\r
- ftp://gee.cs.oswego.edu/pub/misc/malloc-2.8.5.h\r
- You don't really need this .h file unless you call functions not\r
- defined in your system include files. The .h file contains only the\r
- excerpts from this file needed for using this malloc on ANSI C/C++\r
- systems, so long as you haven't changed compile-time options about\r
- naming and tuning parameters. If you do, then you can create your\r
- own malloc.h that does include all settings by cutting at the point\r
- indicated below. Note that you may already by default be using a C\r
- library containing a malloc that is based on some version of this\r
- malloc (for example in linux). You might still want to use the one\r
- in this file to customize settings or to avoid overheads associated\r
- with library versions.\r
-\r
-* Vital statistics:\r
-\r
- Supported pointer/size_t representation: 4 or 8 bytes\r
- size_t MUST be an unsigned type of the same width as\r
- pointers. (If you are using an ancient system that declares\r
- size_t as a signed type, or need it to be a different width\r
- than pointers, you can use a previous release of this malloc\r
- (e.g. 2.7.2) supporting these.)\r
-\r
- Alignment: 8 bytes (default)\r
- This suffices for nearly all current machines and C compilers.\r
- However, you can define MALLOC_ALIGNMENT to be wider than this\r
- if necessary (up to 128bytes), at the expense of using more space.\r
-\r
- Minimum overhead per allocated chunk: 4 or 8 bytes (if 4byte sizes)\r
- 8 or 16 bytes (if 8byte sizes)\r
- Each malloced chunk has a hidden word of overhead holding size\r
- and status information, and additional cross-check word\r
- if FOOTERS is defined.\r
-\r
- Minimum allocated size: 4-byte ptrs: 16 bytes (including overhead)\r
- 8-byte ptrs: 32 bytes (including overhead)\r
-\r
- Even a request for zero bytes (i.e., malloc(0)) returns a\r
- pointer to something of the minimum allocatable size.\r
- The maximum overhead wastage (i.e., number of extra bytes\r
- allocated than were requested in malloc) is less than or equal\r
- to the minimum size, except for requests >= mmap_threshold that\r
- are serviced via mmap(), where the worst case wastage is about\r
- 32 bytes plus the remainder from a system page (the minimal\r
- mmap unit); typically 4096 or 8192 bytes.\r
-\r
- Security: static-safe; optionally more or less\r
- The "security" of malloc refers to the ability of malicious\r
- code to accentuate the effects of errors (for example, freeing\r
- space that is not currently malloc'ed or overwriting past the\r
- ends of chunks) in code that calls malloc. This malloc\r
- guarantees not to modify any memory locations below the base of\r
- heap, i.e., static variables, even in the presence of usage\r
- errors. The routines additionally detect most improper frees\r
- and reallocs. All this holds as long as the static bookkeeping\r
- for malloc itself is not corrupted by some other means. This\r
- is only one aspect of security -- these checks do not, and\r
- cannot, detect all possible programming errors.\r
-\r
- If FOOTERS is defined nonzero, then each allocated chunk\r
- carries an additional check word to verify that it was malloced\r
- from its space. These check words are the same within each\r
- execution of a program using malloc, but differ across\r
- executions, so externally crafted fake chunks cannot be\r
- freed. This improves security by rejecting frees/reallocs that\r
- could corrupt heap memory, in addition to the checks preventing\r
- writes to statics that are always on. This may further improve\r
- security at the expense of time and space overhead. (Note that\r
- FOOTERS may also be worth using with MSPACES.)\r
-\r
- By default detected errors cause the program to abort (calling\r
- "abort()"). You can override this to instead proceed past\r
- errors by defining PROCEED_ON_ERROR. In this case, a bad free\r
- has no effect, and a malloc that encounters a bad address\r
- caused by user overwrites will ignore the bad address by\r
- dropping pointers and indices to all known memory. This may\r
- be appropriate for programs that should continue if at all\r
- possible in the face of programming errors, although they may\r
- run out of memory because dropped memory is never reclaimed.\r
-\r
- If you don't like either of these options, you can define\r
- CORRUPTION_ERROR_ACTION and USAGE_ERROR_ACTION to do anything\r
- else. And if if you are sure that your program using malloc has\r
- no errors or vulnerabilities, you can define INSECURE to 1,\r
- which might (or might not) provide a small performance improvement.\r
-\r
- It is also possible to limit the maximum total allocatable\r
- space, using malloc_set_footprint_limit. This is not\r
- designed as a security feature in itself (calls to set limits\r
- are not screened or privileged), but may be useful as one\r
- aspect of a secure implementation.\r
-\r
- Thread-safety: NOT thread-safe unless USE_LOCKS defined non-zero\r
- When USE_LOCKS is defined, each public call to malloc, free,\r
- etc is surrounded with a lock. By default, this uses a plain\r
- pthread mutex, win32 critical section, or a spin-lock if if\r
- available for the platform and not disabled by setting\r
- USE_SPIN_LOCKS=0. However, if USE_RECURSIVE_LOCKS is defined,\r
- recursive versions are used instead (which are not required for\r
- base functionality but may be needed in layered extensions).\r
- Using a global lock is not especially fast, and can be a major\r
- bottleneck. It is designed only to provide minimal protection\r
- in concurrent environments, and to provide a basis for\r
- extensions. If you are using malloc in a concurrent program,\r
- consider instead using nedmalloc\r
- (http://www.nedprod.com/programs/portable/nedmalloc/) or\r
- ptmalloc (See http://www.malloc.de), which are derived from\r
- versions of this malloc.\r
-\r
- System requirements: Any combination of MORECORE and/or MMAP/MUNMAP\r
- This malloc can use unix sbrk or any emulation (invoked using\r
- the CALL_MORECORE macro) and/or mmap/munmap or any emulation\r
- (invoked using CALL_MMAP/CALL_MUNMAP) to get and release system\r
- memory. On most unix systems, it tends to work best if both\r
- MORECORE and MMAP are enabled. On Win32, it uses emulations\r
- based on VirtualAlloc. It also uses common C library functions\r
- like memset.\r
-\r
- Compliance: I believe it is compliant with the Single Unix Specification\r
- (See http://www.unix.org). Also SVID/XPG, ANSI C, and probably\r
- others as well.\r
-\r
-* Overview of algorithms\r
-\r
- This is not the fastest, most space-conserving, most portable, or\r
- most tunable malloc ever written. However it is among the fastest\r
- while also being among the most space-conserving, portable and\r
- tunable. Consistent balance across these factors results in a good\r
- general-purpose allocator for malloc-intensive programs.\r
-\r
- In most ways, this malloc is a best-fit allocator. Generally, it\r
- chooses the best-fitting existing chunk for a request, with ties\r
- broken in approximately least-recently-used order. (This strategy\r
- normally maintains low fragmentation.) However, for requests less\r
- than 256bytes, it deviates from best-fit when there is not an\r
- exactly fitting available chunk by preferring to use space adjacent\r
- to that used for the previous small request, as well as by breaking\r
- ties in approximately most-recently-used order. (These enhance\r
- locality of series of small allocations.) And for very large requests\r
- (>= 256Kb by default), it relies on system memory mapping\r
- facilities, if supported. (This helps avoid carrying around and\r
- possibly fragmenting memory used only for large chunks.)\r
-\r
- All operations (except malloc_stats and mallinfo) have execution\r
- times that are bounded by a constant factor of the number of bits in\r
- a size_t, not counting any clearing in calloc or copying in realloc,\r
- or actions surrounding MORECORE and MMAP that have times\r
- proportional to the number of non-contiguous regions returned by\r
- system allocation routines, which is often just 1. In real-time\r
- applications, you can optionally suppress segment traversals using\r
- NO_SEGMENT_TRAVERSAL, which assures bounded execution even when\r
- system allocators return non-contiguous spaces, at the typical\r
- expense of carrying around more memory and increased fragmentation.\r
-\r
- The implementation is not very modular and seriously overuses\r
- macros. Perhaps someday all C compilers will do as good a job\r
- inlining modular code as can now be done by brute-force expansion,\r
- but now, enough of them seem not to.\r
-\r
- Some compilers issue a lot of warnings about code that is\r
- dead/unreachable only on some platforms, and also about intentional\r
- uses of negation on unsigned types. All known cases of each can be\r
- ignored.\r
-\r
- For a longer but out of date high-level description, see\r
- http://gee.cs.oswego.edu/dl/html/malloc.html\r
-\r
-* MSPACES\r
- If MSPACES is defined, then in addition to malloc, free, etc.,\r
- this file also defines mspace_malloc, mspace_free, etc. These\r
- are versions of malloc routines that take an "mspace" argument\r
- obtained using create_mspace, to control all internal bookkeeping.\r
- If ONLY_MSPACES is defined, only these versions are compiled.\r
- So if you would like to use this allocator for only some allocations,\r
- and your system malloc for others, you can compile with\r
- ONLY_MSPACES and then do something like...\r
- static mspace mymspace = create_mspace(0,0); // for example\r
- #define mymalloc(bytes) mspace_malloc(mymspace, bytes)\r
-\r
- (Note: If you only need one instance of an mspace, you can instead\r
- use "USE_DL_PREFIX" to relabel the global malloc.)\r
-\r
- You can similarly create thread-local allocators by storing\r
- mspaces as thread-locals. For example:\r
- static __thread mspace tlms = 0;\r
- void* tlmalloc(size_t bytes) {\r
- if (tlms == 0) tlms = create_mspace(0, 0);\r
- return mspace_malloc(tlms, bytes);\r
- }\r
- void tlfree(void* mem) { mspace_free(tlms, mem); }\r
-\r
- Unless FOOTERS is defined, each mspace is completely independent.\r
- You cannot allocate from one and free to another (although\r
- conformance is only weakly checked, so usage errors are not always\r
- caught). If FOOTERS is defined, then each chunk carries around a tag\r
- indicating its originating mspace, and frees are directed to their\r
- originating spaces. Normally, this requires use of locks.\r
-\r
- ------------------------- Compile-time options ---------------------------\r
-\r
-Be careful in setting #define values for numerical constants of type\r
-size_t. On some systems, literal values are not automatically extended\r
-to size_t precision unless they are explicitly casted. You can also\r
-use the symbolic values MAX_SIZE_T, SIZE_T_ONE, etc below.\r
-\r
-WIN32 default: defined if _WIN32 defined\r
- Defining WIN32 sets up defaults for MS environment and compilers.\r
- Otherwise defaults are for unix. Beware that there seem to be some\r
- cases where this malloc might not be a pure drop-in replacement for\r
- Win32 malloc: Random-looking failures from Win32 GDI API's (eg;\r
- SetDIBits()) may be due to bugs in some video driver implementations\r
- when pixel buffers are malloc()ed, and the region spans more than\r
- one VirtualAlloc()ed region. Because dlmalloc uses a small (64Kb)\r
- default granularity, pixel buffers may straddle virtual allocation\r
- regions more often than when using the Microsoft allocator. You can\r
- avoid this by using VirtualAlloc() and VirtualFree() for all pixel\r
- buffers rather than using malloc(). If this is not possible,\r
- recompile this malloc with a larger DEFAULT_GRANULARITY. Note:\r
- in cases where MSC and gcc (cygwin) are known to differ on WIN32,\r
- conditions use _MSC_VER to distinguish them.\r
-\r
-DLMALLOC_EXPORT default: extern\r
- Defines how public APIs are declared. If you want to export via a\r
- Windows DLL, you might define this as\r
- #define DLMALLOC_EXPORT extern __declspace(dllexport)\r
- If you want a POSIX ELF shared object, you might use\r
- #define DLMALLOC_EXPORT extern __attribute__((visibility("default")))\r
-\r
-MALLOC_ALIGNMENT default: (size_t)8\r
- Controls the minimum alignment for malloc'ed chunks. It must be a\r
- power of two and at least 8, even on machines for which smaller\r
- alignments would suffice. It may be defined as larger than this\r
- though. Note however that code and data structures are optimized for\r
- the case of 8-byte alignment.\r
-\r
-MSPACES default: 0 (false)\r
- If true, compile in support for independent allocation spaces.\r
- This is only supported if HAVE_MMAP is true.\r
-\r
-ONLY_MSPACES default: 0 (false)\r
- If true, only compile in mspace versions, not regular versions.\r
-\r
-USE_LOCKS default: 0 (false)\r
- Causes each call to each public routine to be surrounded with\r
- pthread or WIN32 mutex lock/unlock. (If set true, this can be\r
- overridden on a per-mspace basis for mspace versions.) If set to a\r
- non-zero value other than 1, locks are used, but their\r
- implementation is left out, so lock functions must be supplied manually,\r
- as described below.\r
-\r
-USE_SPIN_LOCKS default: 1 iff USE_LOCKS and spin locks available\r
- If true, uses custom spin locks for locking. This is currently\r
- supported only gcc >= 4.1, older gccs on x86 platforms, and recent\r
- MS compilers. Otherwise, posix locks or win32 critical sections are\r
- used.\r
-\r
-USE_RECURSIVE_LOCKS default: not defined\r
- If defined nonzero, uses recursive (aka reentrant) locks, otherwise\r
- uses plain mutexes. This is not required for malloc proper, but may\r
- be needed for layered allocators such as nedmalloc.\r
-\r
-FOOTERS default: 0\r
- If true, provide extra checking and dispatching by placing\r
- information in the footers of allocated chunks. This adds\r
- space and time overhead.\r
-\r
-INSECURE default: 0\r
- If true, omit checks for usage errors and heap space overwrites.\r
-\r
-USE_DL_PREFIX default: NOT defined\r
- Causes compiler to prefix all public routines with the string 'dl'.\r
- This can be useful when you only want to use this malloc in one part\r
- of a program, using your regular system malloc elsewhere.\r
-\r
-MALLOC_INSPECT_ALL default: NOT defined\r
- If defined, compiles malloc_inspect_all and mspace_inspect_all, that\r
- perform traversal of all heap space. Unless access to these\r
- functions is otherwise restricted, you probably do not want to\r
- include them in secure implementations.\r
-\r
-ABORT default: defined as abort()\r
- Defines how to abort on failed checks. On most systems, a failed\r
- check cannot die with an "assert" or even print an informative\r
- message, because the underlying print routines in turn call malloc,\r
- which will fail again. Generally, the best policy is to simply call\r
- abort(). It's not very useful to do more than this because many\r
- errors due to overwriting will show up as address faults (null, odd\r
- addresses etc) rather than malloc-triggered checks, so will also\r
- abort. Also, most compilers know that abort() does not return, so\r
- can better optimize code conditionally calling it.\r
-\r
-PROCEED_ON_ERROR default: defined as 0 (false)\r
- Controls whether detected bad addresses cause them to bypassed\r
- rather than aborting. If set, detected bad arguments to free and\r
- realloc are ignored. And all bookkeeping information is zeroed out\r
- upon a detected overwrite of freed heap space, thus losing the\r
- ability to ever return it from malloc again, but enabling the\r
- application to proceed. If PROCEED_ON_ERROR is defined, the\r
- static variable malloc_corruption_error_count is compiled in\r
- and can be examined to see if errors have occurred. This option\r
- generates slower code than the default abort policy.\r
-\r
-DEBUG default: NOT defined\r
- The DEBUG setting is mainly intended for people trying to modify\r
- this code or diagnose problems when porting to new platforms.\r
- However, it may also be able to better isolate user errors than just\r
- using runtime checks. The assertions in the check routines spell\r
- out in more detail the assumptions and invariants underlying the\r
- algorithms. The checking is fairly extensive, and will slow down\r
- execution noticeably. Calling malloc_stats or mallinfo with DEBUG\r
- set will attempt to check every non-mmapped allocated and free chunk\r
- in the course of computing the summaries.\r
-\r
-ABORT_ON_ASSERT_FAILURE default: defined as 1 (true)\r
- Debugging assertion failures can be nearly impossible if your\r
- version of the assert macro causes malloc to be called, which will\r
- lead to a cascade of further failures, blowing the runtime stack.\r
- ABORT_ON_ASSERT_FAILURE cause assertions failures to call abort(),\r
- which will usually make debugging easier.\r
-\r
-MALLOC_FAILURE_ACTION default: sets errno to ENOMEM, or no-op on win32\r
- The action to take before "return 0" when malloc fails to be able to\r
- return memory because there is none available.\r
-\r
-HAVE_MORECORE default: 1 (true) unless win32 or ONLY_MSPACES\r
- True if this system supports sbrk or an emulation of it.\r
-\r
-MORECORE default: sbrk\r
- The name of the sbrk-style system routine to call to obtain more\r
- memory. See below for guidance on writing custom MORECORE\r
- functions. The type of the argument to sbrk/MORECORE varies across\r
- systems. It cannot be size_t, because it supports negative\r
- arguments, so it is normally the signed type of the same width as\r
- size_t (sometimes declared as "intptr_t"). It doesn't much matter\r
- though. Internally, we only call it with arguments less than half\r
- the max value of a size_t, which should work across all reasonable\r
- possibilities, although sometimes generating compiler warnings.\r
-\r
-MORECORE_CONTIGUOUS default: 1 (true) if HAVE_MORECORE\r
- If true, take advantage of fact that consecutive calls to MORECORE\r
- with positive arguments always return contiguous increasing\r
- addresses. This is true of unix sbrk. It does not hurt too much to\r
- set it true anyway, since malloc copes with non-contiguities.\r
- Setting it false when definitely non-contiguous saves time\r
- and possibly wasted space it would take to discover this though.\r
-\r
-MORECORE_CANNOT_TRIM default: NOT defined\r
- True if MORECORE cannot release space back to the system when given\r
- negative arguments. This is generally necessary only if you are\r
- using a hand-crafted MORECORE function that cannot handle negative\r
- arguments.\r
-\r
-NO_SEGMENT_TRAVERSAL default: 0\r
- If non-zero, suppresses traversals of memory segments\r
- returned by either MORECORE or CALL_MMAP. This disables\r
- merging of segments that are contiguous, and selectively\r
- releasing them to the OS if unused, but bounds execution times.\r
-\r
-HAVE_MMAP default: 1 (true)\r
- True if this system supports mmap or an emulation of it. If so, and\r
- HAVE_MORECORE is not true, MMAP is used for all system\r
- allocation. If set and HAVE_MORECORE is true as well, MMAP is\r
- primarily used to directly allocate very large blocks. It is also\r
- used as a backup strategy in cases where MORECORE fails to provide\r
- space from system. Note: A single call to MUNMAP is assumed to be\r
- able to unmap memory that may have be allocated using multiple calls\r
- to MMAP, so long as they are adjacent.\r
-\r
-HAVE_MREMAP default: 1 on linux, else 0\r
- If true realloc() uses mremap() to re-allocate large blocks and\r
- extend or shrink allocation spaces.\r
-\r
-MMAP_CLEARS default: 1 except on WINCE.\r
- True if mmap clears memory so calloc doesn't need to. This is true\r
- for standard unix mmap using /dev/zero and on WIN32 except for WINCE.\r
-\r
-USE_BUILTIN_FFS default: 0 (i.e., not used)\r
- Causes malloc to use the builtin ffs() function to compute indices.\r
- Some compilers may recognize and intrinsify ffs to be faster than the\r
- supplied C version. Also, the case of x86 using gcc is special-cased\r
- to an asm instruction, so is already as fast as it can be, and so\r
- this setting has no effect. Similarly for Win32 under recent MS compilers.\r
- (On most x86s, the asm version is only slightly faster than the C version.)\r
-\r
-malloc_getpagesize default: derive from system includes, or 4096.\r
- The system page size. To the extent possible, this malloc manages\r
- memory from the system in page-size units. This may be (and\r
- usually is) a function rather than a constant. This is ignored\r
- if WIN32, where page size is determined using getSystemInfo during\r
- initialization.\r
-\r
-USE_DEV_RANDOM default: 0 (i.e., not used)\r
- Causes malloc to use /dev/random to initialize secure magic seed for\r
- stamping footers. Otherwise, the current time is used.\r
-\r
-NO_MALLINFO default: 0\r
- If defined, don't compile "mallinfo". This can be a simple way\r
- of dealing with mismatches between system declarations and\r
- those in this file.\r
-\r
-MALLINFO_FIELD_TYPE default: size_t\r
- The type of the fields in the mallinfo struct. This was originally\r
- defined as "int" in SVID etc, but is more usefully defined as\r
- size_t. The value is used only if HAVE_USR_INCLUDE_MALLOC_H is not set\r
-\r
-NO_MALLOC_STATS default: 0\r
- If defined, don't compile "malloc_stats". This avoids calls to\r
- fprintf and bringing in stdio dependencies you might not want.\r
-\r
-REALLOC_ZERO_BYTES_FREES default: not defined\r
- This should be set if a call to realloc with zero bytes should\r
- be the same as a call to free. Some people think it should. Otherwise,\r
- since this malloc returns a unique pointer for malloc(0), so does\r
- realloc(p, 0).\r
-\r
-LACKS_UNISTD_H, LACKS_FCNTL_H, LACKS_SYS_PARAM_H, LACKS_SYS_MMAN_H\r
-LACKS_STRINGS_H, LACKS_STRING_H, LACKS_SYS_TYPES_H, LACKS_ERRNO_H\r
-LACKS_STDLIB_H LACKS_SCHED_H LACKS_TIME_H default: NOT defined unless on WIN32\r
- Define these if your system does not have these header files.\r
- You might need to manually insert some of the declarations they provide.\r
-\r
-DEFAULT_GRANULARITY default: page size if MORECORE_CONTIGUOUS,\r
- system_info.dwAllocationGranularity in WIN32,\r
- otherwise 64K.\r
- Also settable using mallopt(M_GRANULARITY, x)\r
- The unit for allocating and deallocating memory from the system. On\r
- most systems with contiguous MORECORE, there is no reason to\r
- make this more than a page. However, systems with MMAP tend to\r
- either require or encourage larger granularities. You can increase\r
- this value to prevent system allocation functions to be called so\r
- often, especially if they are slow. The value must be at least one\r
- page and must be a power of two. Setting to 0 causes initialization\r
- to either page size or win32 region size. (Note: In previous\r
- versions of malloc, the equivalent of this option was called\r
- "TOP_PAD")\r
-\r
-DEFAULT_TRIM_THRESHOLD default: 2MB\r
- Also settable using mallopt(M_TRIM_THRESHOLD, x)\r
- The maximum amount of unused top-most memory to keep before\r
- releasing via malloc_trim in free(). Automatic trimming is mainly\r
- useful in long-lived programs using contiguous MORECORE. Because\r
- trimming via sbrk can be slow on some systems, and can sometimes be\r
- wasteful (in cases where programs immediately afterward allocate\r
- more large chunks) the value should be high enough so that your\r
- overall system performance would improve by releasing this much\r
- memory. As a rough guide, you might set to a value close to the\r
- average size of a process (program) running on your system.\r
- Releasing this much memory would allow such a process to run in\r
- memory. Generally, it is worth tuning trim thresholds when a\r
- program undergoes phases where several large chunks are allocated\r
- and released in ways that can reuse each other's storage, perhaps\r
- mixed with phases where there are no such chunks at all. The trim\r
- value must be greater than page size to have any useful effect. To\r
- disable trimming completely, you can set to MAX_SIZE_T. Note that the trick\r
- some people use of mallocing a huge space and then freeing it at\r
- program startup, in an attempt to reserve system memory, doesn't\r
- have the intended effect under automatic trimming, since that memory\r
- will immediately be returned to the system.\r
-\r
-DEFAULT_MMAP_THRESHOLD default: 256K\r
- Also settable using mallopt(M_MMAP_THRESHOLD, x)\r
- The request size threshold for using MMAP to directly service a\r
- request. Requests of at least this size that cannot be allocated\r
- using already-existing space will be serviced via mmap. (If enough\r
- normal freed space already exists it is used instead.) Using mmap\r
- segregates relatively large chunks of memory so that they can be\r
- individually obtained and released from the host system. A request\r
- serviced through mmap is never reused by any other request (at least\r
- not directly; the system may just so happen to remap successive\r
- requests to the same locations). Segregating space in this way has\r
- the benefits that: Mmapped space can always be individually released\r
- back to the system, which helps keep the system level memory demands\r
- of a long-lived program low. Also, mapped memory doesn't become\r
- `locked' between other chunks, as can happen with normally allocated\r
- chunks, which means that even trimming via malloc_trim would not\r
- release them. However, it has the disadvantage that the space\r
- cannot be reclaimed, consolidated, and then used to service later\r
- requests, as happens with normal chunks. The advantages of mmap\r
- nearly always outweigh disadvantages for "large" chunks, but the\r
- value of "large" may vary across systems. The default is an\r
- empirically derived value that works well in most systems. You can\r
- disable mmap by setting to MAX_SIZE_T.\r
-\r
-MAX_RELEASE_CHECK_RATE default: 4095 unless not HAVE_MMAP\r
- The number of consolidated frees between checks to release\r
- unused segments when freeing. When using non-contiguous segments,\r
- especially with multiple mspaces, checking only for topmost space\r
- doesn't always suffice to trigger trimming. To compensate for this,\r
- free() will, with a period of MAX_RELEASE_CHECK_RATE (or the\r
- current number of segments, if greater) try to release unused\r
- segments to the OS when freeing chunks that result in\r
- consolidation. The best value for this parameter is a compromise\r
- between slowing down frees with relatively costly checks that\r
- rarely trigger versus holding on to unused memory. To effectively\r
- disable, set to MAX_SIZE_T. This may lead to a very slight speed\r
- improvement at the expense of carrying around more memory.\r
-*/\r
-\r
-#ifndef REGTEST\r
-#include "dlmalloc.h"\r
-\r
-/* Version identifier to allow people to support multiple versions */\r
-#ifndef DLMALLOC_VERSION\r
-#define DLMALLOC_VERSION 20805\r
-#endif /* DLMALLOC_VERSION */\r
-\r
-#ifndef DLMALLOC_EXPORT\r
-#define DLMALLOC_EXPORT extern\r
-#endif\r
-\r
-#ifndef WIN32\r
-#ifdef _WIN32\r
-#define WIN32 1\r
-#endif /* _WIN32 */\r
-#ifdef _WIN32_WCE\r
-#define LACKS_FCNTL_H\r
-#define WIN32 1\r
-#endif /* _WIN32_WCE */\r
-#endif /* WIN32 */\r
-#ifdef WIN32\r
-#define WIN32_LEAN_AND_MEAN\r
-#include <windows.h>\r
-#include <tchar.h>\r
-#define HAVE_MMAP 1\r
-#define HAVE_MORECORE 0\r
-#define LACKS_UNISTD_H\r
-#define LACKS_SYS_PARAM_H\r
-#define LACKS_SYS_MMAN_H\r
-#define LACKS_STRING_H\r
-#define LACKS_STRINGS_H\r
-#define LACKS_SYS_TYPES_H\r
-#define LACKS_ERRNO_H\r
-#define LACKS_SCHED_H\r
-#ifndef MALLOC_FAILURE_ACTION\r
-#define MALLOC_FAILURE_ACTION\r
-#endif /* MALLOC_FAILURE_ACTION */\r
-#ifndef MMAP_CLEARS\r
-#ifdef _WIN32_WCE /* WINCE reportedly does not clear */\r
-#define MMAP_CLEARS 0\r
-#else\r
-#define MMAP_CLEARS 1\r
-#endif /* _WIN32_WCE */\r
-#endif /*MMAP_CLEARS */\r
-#endif /* WIN32 */\r
-\r
-#if defined(DARWIN) || defined(_DARWIN)\r
-/* Mac OSX docs advise not to use sbrk; it seems better to use mmap */\r
-#ifndef HAVE_MORECORE\r
-#define HAVE_MORECORE 0\r
-#define HAVE_MMAP 1\r
-/* OSX allocators provide 16 byte alignment */\r
-#ifndef MALLOC_ALIGNMENT\r
-#define MALLOC_ALIGNMENT ((size_t)16U)\r
-#endif\r
-#endif /* HAVE_MORECORE */\r
-#endif /* DARWIN */\r
-\r
-#ifndef LACKS_SYS_TYPES_H\r
-#include <sys/types.h> /* For size_t */\r
-#endif /* LACKS_SYS_TYPES_H */\r
-\r
-/* The maximum possible size_t value has all bits set */\r
-#define MAX_SIZE_T (~(size_t)0)\r
-\r
-#ifndef USE_LOCKS /* ensure true if spin or recursive locks set */\r
-#define USE_LOCKS ((defined(USE_SPIN_LOCKS) && USE_SPIN_LOCKS != 0) || \\r
- (defined(USE_RECURSIVE_LOCKS) && USE_RECURSIVE_LOCKS != 0))\r
-#endif /* USE_LOCKS */\r
-\r
-#if USE_LOCKS /* Spin locks for gcc >= 4.1, older gcc on x86, MSC >= 1310 */\r
-#if ((defined(__GNUC__) && \\r
- ((__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) || \\r
- defined(__i386__) || defined(__x86_64__))) || \\r
- (defined(_MSC_VER) && _MSC_VER>=1310))\r
-#ifndef USE_SPIN_LOCKS\r
-#define USE_SPIN_LOCKS 1\r
-#endif /* USE_SPIN_LOCKS */\r
-#elif USE_SPIN_LOCKS\r
-#error "USE_SPIN_LOCKS defined without implementation"\r
-#endif /* ... locks available... */\r
-#elif !defined(USE_SPIN_LOCKS)\r
-#define USE_SPIN_LOCKS 0\r
-#endif /* USE_LOCKS */\r
-\r
-#ifndef ONLY_MSPACES\r
-#define ONLY_MSPACES 0\r
-#endif /* ONLY_MSPACES */\r
-#ifndef MSPACES\r
-#if ONLY_MSPACES\r
-#define MSPACES 1\r
-#else /* ONLY_MSPACES */\r
-#define MSPACES 0\r
-#endif /* ONLY_MSPACES */\r
-#endif /* MSPACES */\r
-#ifndef MALLOC_ALIGNMENT\r
-#define MALLOC_ALIGNMENT ((size_t)8U)\r
-#endif /* MALLOC_ALIGNMENT */\r
-#ifndef FOOTERS\r
-#define FOOTERS 0\r
-#endif /* FOOTERS */\r
-#ifndef ABORT\r
-#define ABORT abort()\r
-#endif /* ABORT */\r
-#ifndef ABORT_ON_ASSERT_FAILURE\r
-#define ABORT_ON_ASSERT_FAILURE 1\r
-#endif /* ABORT_ON_ASSERT_FAILURE */\r
-#ifndef PROCEED_ON_ERROR\r
-#define PROCEED_ON_ERROR 0\r
-#endif /* PROCEED_ON_ERROR */\r
-\r
-#ifndef INSECURE\r
-#define INSECURE 0\r
-#endif /* INSECURE */\r
-#ifndef MALLOC_INSPECT_ALL\r
-#define MALLOC_INSPECT_ALL 0\r
-#endif /* MALLOC_INSPECT_ALL */\r
-#ifndef HAVE_MMAP\r
-#define HAVE_MMAP 1\r
-#endif /* HAVE_MMAP */\r
-#ifndef MMAP_CLEARS\r
-#define MMAP_CLEARS 1\r
-#endif /* MMAP_CLEARS */\r
-#ifndef HAVE_MREMAP\r
-#ifdef linux\r
-#define HAVE_MREMAP 1\r
-#define _GNU_SOURCE /* Turns on mremap() definition */\r
-#else /* linux */\r
-#define HAVE_MREMAP 0\r
-#endif /* linux */\r
-#endif /* HAVE_MREMAP */\r
-#ifndef MALLOC_FAILURE_ACTION\r
-#define MALLOC_FAILURE_ACTION errno = ENOMEM;\r
-#endif /* MALLOC_FAILURE_ACTION */\r
-#ifndef HAVE_MORECORE\r
-#if ONLY_MSPACES\r
-#define HAVE_MORECORE 0\r
-#else /* ONLY_MSPACES */\r
-#define HAVE_MORECORE 1\r
-#endif /* ONLY_MSPACES */\r
-#endif /* HAVE_MORECORE */\r
-#if !HAVE_MORECORE\r
-#define MORECORE_CONTIGUOUS 0\r
-#else /* !HAVE_MORECORE */\r
-#define MORECORE_DEFAULT sbrk\r
-#ifndef MORECORE_CONTIGUOUS\r
-#define MORECORE_CONTIGUOUS 1\r
-#endif /* MORECORE_CONTIGUOUS */\r
-#endif /* HAVE_MORECORE */\r
-#ifndef DEFAULT_GRANULARITY\r
-#if (MORECORE_CONTIGUOUS || defined(WIN32))\r
-#define DEFAULT_GRANULARITY (0) /* 0 means to compute in init_mparams */\r
-#else /* MORECORE_CONTIGUOUS */\r
-#define DEFAULT_GRANULARITY ((size_t)64U * (size_t)1024U)\r
-#endif /* MORECORE_CONTIGUOUS */\r
-#endif /* DEFAULT_GRANULARITY */\r
-#ifndef DEFAULT_TRIM_THRESHOLD\r
-#ifndef MORECORE_CANNOT_TRIM\r
-#define DEFAULT_TRIM_THRESHOLD ((size_t)2U * (size_t)1024U * (size_t)1024U)\r
-#else /* MORECORE_CANNOT_TRIM */\r
-#define DEFAULT_TRIM_THRESHOLD MAX_SIZE_T\r
-#endif /* MORECORE_CANNOT_TRIM */\r
-#endif /* DEFAULT_TRIM_THRESHOLD */\r
-#ifndef DEFAULT_MMAP_THRESHOLD\r
-#if HAVE_MMAP\r
-#define DEFAULT_MMAP_THRESHOLD ((size_t)256U * (size_t)1024U)\r
-#else /* HAVE_MMAP */\r
-#define DEFAULT_MMAP_THRESHOLD MAX_SIZE_T\r
-#endif /* HAVE_MMAP */\r
-#endif /* DEFAULT_MMAP_THRESHOLD */\r
-#ifndef MAX_RELEASE_CHECK_RATE\r
-#if HAVE_MMAP\r
-#define MAX_RELEASE_CHECK_RATE 4095\r
-#else\r
-#define MAX_RELEASE_CHECK_RATE MAX_SIZE_T\r
-#endif /* HAVE_MMAP */\r
-#endif /* MAX_RELEASE_CHECK_RATE */\r
-#ifndef USE_BUILTIN_FFS\r
-#define USE_BUILTIN_FFS 0\r
-#endif /* USE_BUILTIN_FFS */\r
-#ifndef USE_DEV_RANDOM\r
-#define USE_DEV_RANDOM 0\r
-#endif /* USE_DEV_RANDOM */\r
-#ifndef NO_MALLINFO\r
-#define NO_MALLINFO 0\r
-#endif /* NO_MALLINFO */\r
-#ifndef MALLINFO_FIELD_TYPE\r
-#define MALLINFO_FIELD_TYPE size_t\r
-#endif /* MALLINFO_FIELD_TYPE */\r
-#ifndef NO_MALLOC_STATS\r
-#define NO_MALLOC_STATS 0\r
-#endif /* NO_MALLOC_STATS */\r
-#ifndef NO_SEGMENT_TRAVERSAL\r
-#define NO_SEGMENT_TRAVERSAL 0\r
-#endif /* NO_SEGMENT_TRAVERSAL */\r
-\r
-/*\r
- mallopt tuning options. SVID/XPG defines four standard parameter\r
- numbers for mallopt, normally defined in malloc.h. None of these\r
- are used in this malloc, so setting them has no effect. But this\r
- malloc does support the following options.\r
-*/\r
-\r
-#define M_TRIM_THRESHOLD (-1)\r
-#define M_GRANULARITY (-2)\r
-#define M_MMAP_THRESHOLD (-3)\r
-\r
-/* ------------------------ Mallinfo declarations ------------------------ */\r
-\r
-#if !NO_MALLINFO\r
-/*\r
- This version of malloc supports the standard SVID/XPG mallinfo\r
- routine that returns a struct containing usage properties and\r
- statistics. It should work on any system that has a\r
- /usr/include/malloc.h defining struct mallinfo. The main\r
- declaration needed is the mallinfo struct that is returned (by-copy)\r
- by mallinfo(). The malloinfo struct contains a bunch of fields that\r
- are not even meaningful in this version of malloc. These fields are\r
- are instead filled by mallinfo() with other numbers that might be of\r
- interest.\r
-\r
- HAVE_USR_INCLUDE_MALLOC_H should be set if you have a\r
- /usr/include/malloc.h file that includes a declaration of struct\r
- mallinfo. If so, it is included; else a compliant version is\r
- declared below. These must be precisely the same for mallinfo() to\r
- work. The original SVID version of this struct, defined on most\r
- systems with mallinfo, declares all fields as ints. But some others\r
- define as unsigned long. If your system defines the fields using a\r
- type of different width than listed here, you MUST #include your\r
- system version and #define HAVE_USR_INCLUDE_MALLOC_H.\r
-*/\r
-\r
-/* #define HAVE_USR_INCLUDE_MALLOC_H */\r
-\r
-#ifdef HAVE_USR_INCLUDE_MALLOC_H\r
-#include "/usr/include/malloc.h"\r
-#else /* HAVE_USR_INCLUDE_MALLOC_H */\r
-#ifndef STRUCT_MALLINFO_DECLARED\r
-/* HP-UX (and others?) redefines mallinfo unless _STRUCT_MALLINFO is defined */\r
-#define _STRUCT_MALLINFO\r
-#define STRUCT_MALLINFO_DECLARED 1\r
-struct mallinfo {\r
- MALLINFO_FIELD_TYPE arena; /* non-mmapped space allocated from system */\r
- MALLINFO_FIELD_TYPE ordblks; /* number of free chunks */\r
- MALLINFO_FIELD_TYPE smblks; /* always 0 */\r
- MALLINFO_FIELD_TYPE hblks; /* always 0 */\r
- MALLINFO_FIELD_TYPE hblkhd; /* space in mmapped regions */\r
- MALLINFO_FIELD_TYPE usmblks; /* maximum total allocated space */\r
- MALLINFO_FIELD_TYPE fsmblks; /* always 0 */\r
- MALLINFO_FIELD_TYPE uordblks; /* total allocated space */\r
- MALLINFO_FIELD_TYPE fordblks; /* total free space */\r
- MALLINFO_FIELD_TYPE keepcost; /* releasable (via malloc_trim) space */\r
-};\r
-#endif /* STRUCT_MALLINFO_DECLARED */\r
-#endif /* HAVE_USR_INCLUDE_MALLOC_H */\r
-#endif /* NO_MALLINFO */\r
-\r
-/*\r
- Try to persuade compilers to inline. The most critical functions for\r
- inlining are defined as macros, so these aren't used for them.\r
-*/\r
-\r
-#ifndef FORCEINLINE\r
- #if defined(__GNUC__)\r
-#define FORCEINLINE __inline __attribute__ ((always_inline))\r
- #elif defined(_MSC_VER)\r
- #define FORCEINLINE __forceinline\r
- #endif\r
-#endif\r
-#ifndef NOINLINE\r
- #if defined(__GNUC__)\r
- #define NOINLINE __attribute__ ((noinline))\r
- #elif defined(_MSC_VER)\r
- #define NOINLINE __declspec(noinline)\r
- #else\r
- #define NOINLINE\r
- #endif\r
-#endif\r
-\r
-#ifdef __cplusplus\r
-extern "C" {\r
-#ifndef FORCEINLINE\r
- #define FORCEINLINE inline\r
-#endif\r
-#endif /* __cplusplus */\r
-#ifndef FORCEINLINE\r
- #define FORCEINLINE\r
-#endif\r
-\r
-#if !ONLY_MSPACES\r
-\r
-/* ------------------- Declarations of public routines ------------------- */\r
-\r
-#ifndef USE_DL_PREFIX\r
-#define dlcalloc calloc\r
-#define dlfree free\r
-#define dlmalloc malloc\r
-#define dlmemalign aligned_alloc\r
-#define dlposix_memalign posix_memalign\r
-#define dlrealloc realloc\r
-#define dlrealloc_in_place realloc_in_place\r
-#define dlvalloc valloc\r
-#define dlpvalloc pvalloc\r
-#define dlmallinfo mallinfo\r
-#define dlmallopt mallopt\r
-#define dlmalloc_trim malloc_trim\r
-#define dlmalloc_stats malloc_stats\r
-#define dlmalloc_usable_size malloc_usable_size\r
-#define dlmalloc_footprint malloc_footprint\r
-#define dlmalloc_max_footprint malloc_max_footprint\r
-#define dlmalloc_footprint_limit malloc_footprint_limit\r
-#define dlmalloc_set_footprint_limit malloc_set_footprint_limit\r
-#define dlmalloc_inspect_all malloc_inspect_all\r
-#define dlindependent_calloc independent_calloc\r
-#define dlindependent_comalloc independent_comalloc\r
-#define dlbulk_free bulk_free\r
-#endif /* USE_DL_PREFIX */\r
-\r
-#if 0 // Redeclaration warnings as PDCLib already declares these in <stdio.h>\r
-\r
-/*\r
- malloc(size_t n)\r
- Returns a pointer to a newly allocated chunk of at least n bytes, or\r
- null if no space is available, in which case errno is set to ENOMEM\r
- on ANSI C systems.\r
-\r
- If n is zero, malloc returns a minimum-sized chunk. (The minimum\r
- size is 16 bytes on most 32bit systems, and 32 bytes on 64bit\r
- systems.) Note that size_t is an unsigned type, so calls with\r
- arguments that would be negative if signed are interpreted as\r
- requests for huge amounts of space, which will often fail. The\r
- maximum supported value of n differs across systems, but is in all\r
- cases less than the maximum representable value of a size_t.\r
-*/\r
-DLMALLOC_EXPORT void* dlmalloc(size_t);\r
-\r
-/*\r
- free(void* p)\r
- Releases the chunk of memory pointed to by p, that had been previously\r
- allocated using malloc or a related routine such as realloc.\r
- It has no effect if p is null. If p was not malloced or already\r
- freed, free(p) will by default cause the current program to abort.\r
-*/\r
-DLMALLOC_EXPORT void dlfree(void*);\r
-\r
-/*\r
- calloc(size_t n_elements, size_t element_size);\r
- Returns a pointer to n_elements * element_size bytes, with all locations\r
- set to zero.\r
-*/\r
-DLMALLOC_EXPORT void* dlcalloc(size_t, size_t);\r
-\r
-/*\r
- realloc(void* p, size_t n)\r
- Returns a pointer to a chunk of size n that contains the same data\r
- as does chunk p up to the minimum of (n, p's size) bytes, or null\r
- if no space is available.\r
-\r
- The returned pointer may or may not be the same as p. The algorithm\r
- prefers extending p in most cases when possible, otherwise it\r
- employs the equivalent of a malloc-copy-free sequence.\r
-\r
- If p is null, realloc is equivalent to malloc.\r
-\r
- If space is not available, realloc returns null, errno is set (if on\r
- ANSI) and p is NOT freed.\r
-\r
- if n is for fewer bytes than already held by p, the newly unused\r
- space is lopped off and freed if possible. realloc with a size\r
- argument of zero (re)allocates a minimum-sized chunk.\r
-\r
- The old unix realloc convention of allowing the last-free'd chunk\r
- to be used as an argument to realloc is not supported.\r
-*/\r
-DLMALLOC_EXPORT void* dlrealloc(void*, size_t);\r
-\r
-#endif\r
-\r
-/*\r
- realloc_in_place(void* p, size_t n)\r
- Resizes the space allocated for p to size n, only if this can be\r
- done without moving p (i.e., only if there is adjacent space\r
- available if n is greater than p's current allocated size, or n is\r
- less than or equal to p's size). This may be used instead of plain\r
- realloc if an alternative allocation strategy is needed upon failure\r
- to expand space; for example, reallocation of a buffer that must be\r
- memory-aligned or cleared. You can use realloc_in_place to trigger\r
- these alternatives only when needed.\r
-\r
- Returns p if successful; otherwise null.\r
-*/\r
-DLMALLOC_EXPORT void* dlrealloc_in_place(void*, size_t);\r
-\r
-#if 0 // Redeclaration warnings as PDCLib already declares these in <stdio.h>\r
-\r
-/*\r
- memalign(size_t alignment, size_t n);\r
- Returns a pointer to a newly allocated chunk of n bytes, aligned\r
- in accord with the alignment argument.\r
-\r
- The alignment argument should be a power of two. If the argument is\r
- not a power of two, the nearest greater power is used.\r
- 8-byte alignment is guaranteed by normal malloc calls, so don't\r
- bother calling memalign with an argument of 8 or less.\r
-\r
- Overreliance on memalign is a sure way to fragment space.\r
-*/\r
-DLMALLOC_EXPORT void* dlmemalign(size_t, size_t);\r
-\r
-#endif\r
-\r
-/*\r
- int posix_memalign(void** pp, size_t alignment, size_t n);\r
- Allocates a chunk of n bytes, aligned in accord with the alignment\r
- argument. Differs from memalign only in that it (1) assigns the\r
- allocated memory to *pp rather than returning it, (2) fails and\r
- returns EINVAL if the alignment is not a power of two (3) fails and\r
- returns ENOMEM if memory cannot be allocated.\r
-*/\r
-DLMALLOC_EXPORT int dlposix_memalign(void**, size_t, size_t);\r
-\r
-/*\r
- valloc(size_t n);\r
- Equivalent to memalign(pagesize, n), where pagesize is the page\r
- size of the system. If the pagesize is unknown, 4096 is used.\r
-*/\r
-DLMALLOC_EXPORT void* dlvalloc(size_t);\r
-\r
-/*\r
- mallopt(int parameter_number, int parameter_value)\r
- Sets tunable parameters The format is to provide a\r
- (parameter-number, parameter-value) pair. mallopt then sets the\r
- corresponding parameter to the argument value if it can (i.e., so\r
- long as the value is meaningful), and returns 1 if successful else\r
- 0. To workaround the fact that mallopt is specified to use int,\r
- not size_t parameters, the value -1 is specially treated as the\r
- maximum unsigned size_t value.\r
-\r
- SVID/XPG/ANSI defines four standard param numbers for mallopt,\r
- normally defined in malloc.h. None of these are use in this malloc,\r
- so setting them has no effect. But this malloc also supports other\r
- options in mallopt. See below for details. Briefly, supported\r
- parameters are as follows (listed defaults are for "typical"\r
- configurations).\r
-\r
- Symbol param # default allowed param values\r
- M_TRIM_THRESHOLD -1 2*1024*1024 any (-1 disables)\r
- M_GRANULARITY -2 page size any power of 2 >= page size\r
- M_MMAP_THRESHOLD -3 256*1024 any (or 0 if no MMAP support)\r
-*/\r
-DLMALLOC_EXPORT int dlmallopt(int, int);\r
-\r
-/*\r
- malloc_footprint();\r
- Returns the number of bytes obtained from the system. The total\r
- number of bytes allocated by malloc, realloc etc., is less than this\r
- value. Unlike mallinfo, this function returns only a precomputed\r
- result, so can be called frequently to monitor memory consumption.\r
- Even if locks are otherwise defined, this function does not use them,\r
- so results might not be up to date.\r
-*/\r
-DLMALLOC_EXPORT size_t dlmalloc_footprint(void);\r
-\r
-/*\r
- malloc_max_footprint();\r
- Returns the maximum number of bytes obtained from the system. This\r
- value will be greater than current footprint if deallocated space\r
- has been reclaimed by the system. The peak number of bytes allocated\r
- by malloc, realloc etc., is less than this value. Unlike mallinfo,\r
- this function returns only a precomputed result, so can be called\r
- frequently to monitor memory consumption. Even if locks are\r
- otherwise defined, this function does not use them, so results might\r
- not be up to date.\r
-*/\r
-DLMALLOC_EXPORT size_t dlmalloc_max_footprint(void);\r
-\r
-/*\r
- malloc_footprint_limit();\r
- Returns the number of bytes that the heap is allowed to obtain from\r
- the system, returning the last value returned by\r
- malloc_set_footprint_limit, or the maximum size_t value if\r
- never set. The returned value reflects a permission. There is no\r
- guarantee that this number of bytes can actually be obtained from\r
- the system.\r
-*/\r
-DLMALLOC_EXPORT size_t dlmalloc_footprint_limit(void);\r
-\r
-/*\r
- malloc_set_footprint_limit();\r
- Sets the maximum number of bytes to obtain from the system, causing\r
- failure returns from malloc and related functions upon attempts to\r
- exceed this value. The argument value may be subject to page\r
- rounding to an enforceable limit; this actual value is returned.\r
- Using an argument of the maximum possible size_t effectively\r
- disables checks. If the argument is less than or equal to the\r
- current malloc_footprint, then all future allocations that require\r
- additional system memory will fail. However, invocation cannot\r
- retroactively deallocate existing used memory.\r
-*/\r
-DLMALLOC_EXPORT size_t dlmalloc_set_footprint_limit(size_t bytes);\r
-\r
-#if MALLOC_INSPECT_ALL\r
-/*\r
- malloc_inspect_all(void(*handler)(void *start,\r
- void *end,\r
- size_t used_bytes,\r
- void* callback_arg),\r
- void* arg);\r
- Traverses the heap and calls the given handler for each managed\r
- region, skipping all bytes that are (or may be) used for bookkeeping\r
- purposes. Traversal does not include include chunks that have been\r
- directly memory mapped. Each reported region begins at the start\r
- address, and continues up to but not including the end address. The\r
- first used_bytes of the region contain allocated data. If\r
- used_bytes is zero, the region is unallocated. The handler is\r
- invoked with the given callback argument. If locks are defined, they\r
- are held during the entire traversal. It is a bad idea to invoke\r
- other malloc functions from within the handler.\r
-\r
- For example, to count the number of in-use chunks with size greater\r
- than 1000, you could write:\r
- static int count = 0;\r
- void count_chunks(void* start, void* end, size_t used, void* arg) {\r
- if (used >= 1000) ++count;\r
- }\r
- then:\r
- malloc_inspect_all(count_chunks, NULL);\r
-\r
- malloc_inspect_all is compiled only if MALLOC_INSPECT_ALL is defined.\r
-*/\r
-DLMALLOC_EXPORT void dlmalloc_inspect_all(void(*handler)(void*, void *, size_t, void*),\r
- void* arg);\r
-\r
-#endif /* MALLOC_INSPECT_ALL */\r
-\r
-#if !NO_MALLINFO\r
-/*\r
- mallinfo()\r
- Returns (by copy) a struct containing various summary statistics:\r
-\r
- arena: current total non-mmapped bytes allocated from system\r
- ordblks: the number of free chunks\r
- smblks: always zero.\r
- hblks: current number of mmapped regions\r
- hblkhd: total bytes held in mmapped regions\r
- usmblks: the maximum total allocated space. This will be greater\r
- than current total if trimming has occurred.\r
- fsmblks: always zero\r
- uordblks: current total allocated space (normal or mmapped)\r
- fordblks: total free space\r
- keepcost: the maximum number of bytes that could ideally be released\r
- back to system via malloc_trim. ("ideally" means that\r
- it ignores page restrictions etc.)\r
-\r
- Because these fields are ints, but internal bookkeeping may\r
- be kept as longs, the reported values may wrap around zero and\r
- thus be inaccurate.\r
-*/\r
-DLMALLOC_EXPORT struct mallinfo dlmallinfo(void);\r
-#endif /* NO_MALLINFO */\r
-\r
-/*\r
- independent_calloc(size_t n_elements, size_t element_size, void* chunks[]);\r
-\r
- independent_calloc is similar to calloc, but instead of returning a\r
- single cleared space, it returns an array of pointers to n_elements\r
- independent elements that can hold contents of size elem_size, each\r
- of which starts out cleared, and can be independently freed,\r
- realloc'ed etc. The elements are guaranteed to be adjacently\r
- allocated (this is not guaranteed to occur with multiple callocs or\r
- mallocs), which may also improve cache locality in some\r
- applications.\r
-\r
- The "chunks" argument is optional (i.e., may be null, which is\r
- probably the most typical usage). If it is null, the returned array\r
- is itself dynamically allocated and should also be freed when it is\r
- no longer needed. Otherwise, the chunks array must be of at least\r
- n_elements in length. It is filled in with the pointers to the\r
- chunks.\r
-\r
- In either case, independent_calloc returns this pointer array, or\r
- null if the allocation failed. If n_elements is zero and "chunks"\r
- is null, it returns a chunk representing an array with zero elements\r
- (which should be freed if not wanted).\r
-\r
- Each element must be freed when it is no longer needed. This can be\r
- done all at once using bulk_free.\r
-\r
- independent_calloc simplifies and speeds up implementations of many\r
- kinds of pools. It may also be useful when constructing large data\r
- structures that initially have a fixed number of fixed-sized nodes,\r
- but the number is not known at compile time, and some of the nodes\r
- may later need to be freed. For example:\r
-\r
- struct Node { int item; struct Node* next; };\r
-\r
- struct Node* build_list() {\r
- struct Node** pool;\r
- int n = read_number_of_nodes_needed();\r
- if (n <= 0) return 0;\r
- pool = (struct Node**)(independent_calloc(n, sizeof(struct Node), 0);\r
- if (pool == 0) die();\r
- // organize into a linked list...\r
- struct Node* first = pool[0];\r
- for (i = 0; i < n-1; ++i)\r
- pool[i]->next = pool[i+1];\r
- free(pool); // Can now free the array (or not, if it is needed later)\r
- return first;\r
- }\r
-*/\r
-DLMALLOC_EXPORT void** dlindependent_calloc(size_t, size_t, void**);\r
-\r
-/*\r
- independent_comalloc(size_t n_elements, size_t sizes[], void* chunks[]);\r
-\r
- independent_comalloc allocates, all at once, a set of n_elements\r
- chunks with sizes indicated in the "sizes" array. It returns\r
- an array of pointers to these elements, each of which can be\r
- independently freed, realloc'ed etc. The elements are guaranteed to\r
- be adjacently allocated (this is not guaranteed to occur with\r
- multiple callocs or mallocs), which may also improve cache locality\r
- in some applications.\r
-\r
- The "chunks" argument is optional (i.e., may be null). If it is null\r
- the returned array is itself dynamically allocated and should also\r
- be freed when it is no longer needed. Otherwise, the chunks array\r
- must be of at least n_elements in length. It is filled in with the\r
- pointers to the chunks.\r
-\r
- In either case, independent_comalloc returns this pointer array, or\r
- null if the allocation failed. If n_elements is zero and chunks is\r
- null, it returns a chunk representing an array with zero elements\r
- (which should be freed if not wanted).\r
-\r
- Each element must be freed when it is no longer needed. This can be\r
- done all at once using bulk_free.\r
-\r
- independent_comallac differs from independent_calloc in that each\r
- element may have a different size, and also that it does not\r
- automatically clear elements.\r
-\r
- independent_comalloc can be used to speed up allocation in cases\r
- where several structs or objects must always be allocated at the\r
- same time. For example:\r
-\r
- struct Head { ... }\r
- struct Foot { ... }\r
-\r
- void send_message(char* msg) {\r
- int msglen = strlen(msg);\r
- size_t sizes[3] = { sizeof(struct Head), msglen, sizeof(struct Foot) };\r
- void* chunks[3];\r
- if (independent_comalloc(3, sizes, chunks) == 0)\r
- die();\r
- struct Head* head = (struct Head*)(chunks[0]);\r
- char* body = (char*)(chunks[1]);\r
- struct Foot* foot = (struct Foot*)(chunks[2]);\r
- // ...\r
- }\r
-\r
- In general though, independent_comalloc is worth using only for\r
- larger values of n_elements. For small values, you probably won't\r
- detect enough difference from series of malloc calls to bother.\r
-\r
- Overuse of independent_comalloc can increase overall memory usage,\r
- since it cannot reuse existing noncontiguous small chunks that\r
- might be available for some of the elements.\r
-*/\r
-DLMALLOC_EXPORT void** dlindependent_comalloc(size_t, size_t*, void**);\r
-\r
-/*\r
- bulk_free(void* array[], size_t n_elements)\r
- Frees and clears (sets to null) each non-null pointer in the given\r
- array. This is likely to be faster than freeing them one-by-one.\r
- If footers are used, pointers that have been allocated in different\r
- mspaces are not freed or cleared, and the count of all such pointers\r
- is returned. For large arrays of pointers with poor locality, it\r
- may be worthwhile to sort this array before calling bulk_free.\r
-*/\r
-DLMALLOC_EXPORT size_t dlbulk_free(void**, size_t n_elements);\r
-\r
-/*\r
- pvalloc(size_t n);\r
- Equivalent to valloc(minimum-page-that-holds(n)), that is,\r
- round up n to nearest pagesize.\r
- */\r
-DLMALLOC_EXPORT void* dlpvalloc(size_t);\r
-\r
-/*\r
- malloc_trim(size_t pad);\r
-\r
- If possible, gives memory back to the system (via negative arguments\r
- to sbrk) if there is unused memory at the `high' end of the malloc\r
- pool or in unused MMAP segments. You can call this after freeing\r
- large blocks of memory to potentially reduce the system-level memory\r
- requirements of a program. However, it cannot guarantee to reduce\r
- memory. Under some allocation patterns, some large free blocks of\r
- memory will be locked between two used chunks, so they cannot be\r
- given back to the system.\r
-\r
- The `pad' argument to malloc_trim represents the amount of free\r
- trailing space to leave untrimmed. If this argument is zero, only\r
- the minimum amount of memory to maintain internal data structures\r
- will be left. Non-zero arguments can be supplied to maintain enough\r
- trailing space to service future expected allocations without having\r
- to re-obtain memory from the system.\r
-\r
- Malloc_trim returns 1 if it actually released any memory, else 0.\r
-*/\r
-DLMALLOC_EXPORT int dlmalloc_trim(size_t);\r
-\r
-/*\r
- malloc_stats();\r
- Prints on stderr the amount of space obtained from the system (both\r
- via sbrk and mmap), the maximum amount (which may be more than\r
- current if malloc_trim and/or munmap got called), and the current\r
- number of bytes allocated via malloc (or realloc, etc) but not yet\r
- freed. Note that this is the number of bytes allocated, not the\r
- number requested. It will be larger than the number requested\r
- because of alignment and bookkeeping overhead. Because it includes\r
- alignment wastage as being in use, this figure may be greater than\r
- zero even when no user-level chunks are allocated.\r
-\r
- The reported current and maximum system memory can be inaccurate if\r
- a program makes other calls to system memory allocation functions\r
- (normally sbrk) outside of malloc.\r
-\r
- malloc_stats prints only the most commonly interesting statistics.\r
- More information can be obtained by calling mallinfo.\r
-*/\r
-DLMALLOC_EXPORT void dlmalloc_stats(void);\r
-\r
-#endif /* ONLY_MSPACES */\r
-\r
-/*\r
- malloc_usable_size(void* p);\r
-\r
- Returns the number of bytes you can actually use in\r
- an allocated chunk, which may be more than you requested (although\r
- often not) due to alignment and minimum size constraints.\r
- You can use this many bytes without worrying about\r
- overwriting other allocated objects. This is not a particularly great\r
- programming practice. malloc_usable_size can be more useful in\r
- debugging and assertions, for example:\r
-\r
- p = malloc(n);\r
- assert(malloc_usable_size(p) >= 256);\r
-*/\r
-size_t dlmalloc_usable_size(void*);\r
-\r
-#if MSPACES\r
-\r
-/*\r
- mspace is an opaque type representing an independent\r
- region of space that supports mspace_malloc, etc.\r
-*/\r
-typedef void* mspace;\r
-\r
-/*\r
- create_mspace creates and returns a new independent space with the\r
- given initial capacity, or, if 0, the default granularity size. It\r
- returns null if there is no system memory available to create the\r
- space. If argument locked is non-zero, the space uses a separate\r
- lock to control access. The capacity of the space will grow\r
- dynamically as needed to service mspace_malloc requests. You can\r
- control the sizes of incremental increases of this space by\r
- compiling with a different DEFAULT_GRANULARITY or dynamically\r
- setting with mallopt(M_GRANULARITY, value).\r
-*/\r
-DLMALLOC_EXPORT mspace create_mspace(size_t capacity, int locked);\r
-\r
-/*\r
- destroy_mspace destroys the given space, and attempts to return all\r
- of its memory back to the system, returning the total number of\r
- bytes freed. After destruction, the results of access to all memory\r
- used by the space become undefined.\r
-*/\r
-DLMALLOC_EXPORT size_t destroy_mspace(mspace msp);\r
-\r
-/*\r
- create_mspace_with_base uses the memory supplied as the initial base\r
- of a new mspace. Part (less than 128*sizeof(size_t) bytes) of this\r
- space is used for bookkeeping, so the capacity must be at least this\r
- large. (Otherwise 0 is returned.) When this initial space is\r
- exhausted, additional memory will be obtained from the system.\r
- Destroying this space will deallocate all additionally allocated\r
- space (if possible) but not the initial base.\r
-*/\r
-DLMALLOC_EXPORT mspace create_mspace_with_base(void* base, size_t capacity, int locked);\r
-\r
-/*\r
- mspace_track_large_chunks controls whether requests for large chunks\r
- are allocated in their own untracked mmapped regions, separate from\r
- others in this mspace. By default large chunks are not tracked,\r
- which reduces fragmentation. However, such chunks are not\r
- necessarily released to the system upon destroy_mspace. Enabling\r
- tracking by setting to true may increase fragmentation, but avoids\r
- leakage when relying on destroy_mspace to release all memory\r
- allocated using this space. The function returns the previous\r
- setting.\r
-*/\r
-DLMALLOC_EXPORT int mspace_track_large_chunks(mspace msp, int enable);\r
-\r
-\r
-/*\r
- mspace_malloc behaves as malloc, but operates within\r
- the given space.\r
-*/\r
-DLMALLOC_EXPORT void* mspace_malloc(mspace msp, size_t bytes);\r
-\r
-/*\r
- mspace_free behaves as free, but operates within\r
- the given space.\r
-\r
- If compiled with FOOTERS==1, mspace_free is not actually needed.\r
- free may be called instead of mspace_free because freed chunks from\r
- any space are handled by their originating spaces.\r
-*/\r
-DLMALLOC_EXPORT void mspace_free(mspace msp, void* mem);\r
-\r
-/*\r
- mspace_realloc behaves as realloc, but operates within\r
- the given space.\r
-\r
- If compiled with FOOTERS==1, mspace_realloc is not actually\r
- needed. realloc may be called instead of mspace_realloc because\r
- realloced chunks from any space are handled by their originating\r
- spaces.\r
-*/\r
-DLMALLOC_EXPORT void* mspace_realloc(mspace msp, void* mem, size_t newsize);\r
-\r
-/*\r
- mspace_calloc behaves as calloc, but operates within\r
- the given space.\r
-*/\r
-DLMALLOC_EXPORT void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size);\r
-\r
-/*\r
- mspace_memalign behaves as memalign, but operates within\r
- the given space.\r
-*/\r
-DLMALLOC_EXPORT void* mspace_memalign(mspace msp, size_t alignment, size_t bytes);\r
-\r
-/*\r
- mspace_independent_calloc behaves as independent_calloc, but\r
- operates within the given space.\r
-*/\r
-DLMALLOC_EXPORT void** mspace_independent_calloc(mspace msp, size_t n_elements,\r
- size_t elem_size, void* chunks[]);\r
-\r
-/*\r
- mspace_independent_comalloc behaves as independent_comalloc, but\r
- operates within the given space.\r
-*/\r
-DLMALLOC_EXPORT void** mspace_independent_comalloc(mspace msp, size_t n_elements,\r
- size_t sizes[], void* chunks[]);\r
-\r
-/*\r
- mspace_footprint() returns the number of bytes obtained from the\r
- system for this space.\r
-*/\r
-DLMALLOC_EXPORT size_t mspace_footprint(mspace msp);\r
-\r
-/*\r
- mspace_max_footprint() returns the peak number of bytes obtained from the\r
- system for this space.\r
-*/\r
-DLMALLOC_EXPORT size_t mspace_max_footprint(mspace msp);\r
-\r
-\r
-#if !NO_MALLINFO\r
-/*\r
- mspace_mallinfo behaves as mallinfo, but reports properties of\r
- the given space.\r
-*/\r
-DLMALLOC_EXPORT struct mallinfo mspace_mallinfo(mspace msp);\r
-#endif /* NO_MALLINFO */\r
-\r
-/*\r
- malloc_usable_size(void* p) behaves the same as malloc_usable_size;\r
-*/\r
-DLMALLOC_EXPORT size_t mspace_usable_size(void* mem);\r
-\r
-/*\r
- mspace_malloc_stats behaves as malloc_stats, but reports\r
- properties of the given space.\r
-*/\r
-DLMALLOC_EXPORT void mspace_malloc_stats(mspace msp);\r
-\r
-/*\r
- mspace_trim behaves as malloc_trim, but\r
- operates within the given space.\r
-*/\r
-DLMALLOC_EXPORT int mspace_trim(mspace msp, size_t pad);\r
-\r
-/*\r
- An alias for mallopt.\r
-*/\r
-DLMALLOC_EXPORT int mspace_mallopt(int, int);\r
-\r
-#endif /* MSPACES */\r
-\r
-#ifdef __cplusplus\r
-} /* end of extern "C" */\r
-#endif /* __cplusplus */\r
-\r
-/*\r
- ========================================================================\r
- To make a fully customizable malloc.h header file, cut everything\r
- above this line, put into file malloc.h, edit to suit, and #include it\r
- on the next line, as well as in programs that use this malloc.\r
- ========================================================================\r
-*/\r
-\r
-/* #include "malloc.h" */\r
-\r
-/*------------------------------ internal #includes ---------------------- */\r
-\r
-#ifdef _MSC_VER\r
-#pragma warning( disable : 4146 ) /* no "unsigned" warnings */\r
-#endif /* _MSC_VER */\r
-#if !NO_MALLOC_STATS\r
-#include <stdio.h> /* for printing in malloc_stats */\r
-#endif /* NO_MALLOC_STATS */\r
-#ifndef LACKS_ERRNO_H\r
-#include <errno.h> /* for MALLOC_FAILURE_ACTION */\r
-#endif /* LACKS_ERRNO_H */\r
-#ifdef DEBUG\r
-#if ABORT_ON_ASSERT_FAILURE\r
-#undef assert\r
-#define assert(x) if(!(x)) ABORT\r
-#else /* ABORT_ON_ASSERT_FAILURE */\r
-#include <assert.h>\r
-#endif /* ABORT_ON_ASSERT_FAILURE */\r
-#else /* DEBUG */\r
-#ifndef assert\r
-#define assert(x)\r
-#endif\r
-#define DEBUG 0\r
-#endif /* DEBUG */\r
-#if !defined(WIN32) && !defined(LACKS_TIME_H)\r
-#include <time.h> /* for magic initialization */\r
-#endif /* WIN32 */\r
-#ifndef LACKS_STDLIB_H\r
-#include <stdlib.h> /* for abort() */\r
-#endif /* LACKS_STDLIB_H */\r
-#ifndef LACKS_STRING_H\r
-#include <string.h> /* for memset etc */\r
-#endif /* LACKS_STRING_H */\r
-#if USE_BUILTIN_FFS\r
-#ifndef LACKS_STRINGS_H\r
-#include <strings.h> /* for ffs */\r
-#endif /* LACKS_STRINGS_H */\r
-#endif /* USE_BUILTIN_FFS */\r
-#if HAVE_MMAP\r
-#ifndef LACKS_SYS_MMAN_H\r
-/* On some versions of linux, mremap decl in mman.h needs __USE_GNU set */\r
-#if (defined(linux) && !defined(__USE_GNU))\r
-#define __USE_GNU 1\r
-#include <sys/mman.h> /* for mmap */\r
-#undef __USE_GNU\r
-#else\r
-#include <sys/mman.h> /* for mmap */\r
-#endif /* linux */\r
-#endif /* LACKS_SYS_MMAN_H */\r
-#ifndef LACKS_FCNTL_H\r
-#include <fcntl.h>\r
-#endif /* LACKS_FCNTL_H */\r
-#endif /* HAVE_MMAP */\r
-#ifndef LACKS_UNISTD_H\r
-#include <unistd.h> /* for sbrk, sysconf */\r
-#else /* LACKS_UNISTD_H */\r
-#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)\r
-/*extern void* sbrk(ptrdiff_t);*/\r
-#endif /* FreeBSD etc */\r
-#endif /* LACKS_UNISTD_H */\r
-\r
-/* Declarations for locking */\r
-#if USE_LOCKS\r
-#ifndef WIN32\r
-#if defined (__SVR4) && defined (__sun) /* solaris */\r
-#include <thread.h>\r
-#elif !defined(LACKS_SCHED_H)\r
-#include <sched.h>\r
-#endif /* solaris or LACKS_SCHED_H */\r
-#if (defined(USE_RECURSIVE_LOCKS) && USE_RECURSIVE_LOCKS != 0) || !USE_SPIN_LOCKS\r
-/*#include <pthread.h>*/\r
-#endif /* USE_RECURSIVE_LOCKS ... */\r
-#elif defined(_MSC_VER)\r
-#ifndef _M_AMD64\r
-/* These are already defined on AMD64 builds */\r
-#ifdef __cplusplus\r
-extern "C" {\r
-#endif /* __cplusplus */\r
-LONG __cdecl _InterlockedCompareExchange(LONG volatile *Dest, LONG Exchange, LONG Comp);\r
-LONG __cdecl _InterlockedExchange(LONG volatile *Target, LONG Value);\r
-#ifdef __cplusplus\r
-}\r
-#endif /* __cplusplus */\r
-#endif /* _M_AMD64 */\r
-#pragma intrinsic (_InterlockedCompareExchange)\r
-#pragma intrinsic (_InterlockedExchange)\r
-#define interlockedcompareexchange _InterlockedCompareExchange\r
-#define interlockedexchange _InterlockedExchange\r
-#elif defined(WIN32) && defined(__GNUC__)\r
-#define interlockedcompareexchange(a, b, c) __sync_val_compare_and_swap(a, c, b)\r
-#define interlockedexchange __sync_lock_test_and_set\r
-#endif /* Win32 */\r
-#endif /* USE_LOCKS */\r
-\r
-/* Declarations for bit scanning on win32 */\r
-#if defined(_MSC_VER) && _MSC_VER>=1300\r
-#ifndef BitScanForward /* Try to avoid pulling in WinNT.h */\r
-#ifdef __cplusplus\r
-extern "C" {\r
-#endif /* __cplusplus */\r
-unsigned char _BitScanForward(unsigned long *index, unsigned long mask);\r
-unsigned char _BitScanReverse(unsigned long *index, unsigned long mask);\r
-#ifdef __cplusplus\r
-}\r
-#endif /* __cplusplus */\r
-\r
-#define BitScanForward _BitScanForward\r
-#define BitScanReverse _BitScanReverse\r
-#pragma intrinsic(_BitScanForward)\r
-#pragma intrinsic(_BitScanReverse)\r
-#endif /* BitScanForward */\r
-#endif /* defined(_MSC_VER) && _MSC_VER>=1300 */\r
-\r
-#ifndef WIN32\r
-#ifndef malloc_getpagesize\r
-# ifdef _SC_PAGESIZE /* some SVR4 systems omit an underscore */\r
-# ifndef _SC_PAGE_SIZE\r
-# define _SC_PAGE_SIZE _SC_PAGESIZE\r
-# endif\r
-# endif\r
-# ifdef _SC_PAGE_SIZE\r
-# define malloc_getpagesize sysconf(_SC_PAGE_SIZE)\r
-# else\r
-# if defined(BSD) || defined(DGUX) || defined(HAVE_GETPAGESIZE)\r
- extern size_t getpagesize();\r
-# define malloc_getpagesize getpagesize()\r
-# else\r
-# ifdef WIN32 /* use supplied emulation of getpagesize */\r
-# define malloc_getpagesize getpagesize()\r
-# else\r
-# ifndef LACKS_SYS_PARAM_H\r
-# include <sys/param.h>\r
-# endif\r
-# ifdef EXEC_PAGESIZE\r
-# define malloc_getpagesize EXEC_PAGESIZE\r
-# else\r
-# ifdef NBPG\r
-# ifndef CLSIZE\r
-# define malloc_getpagesize NBPG\r
-# else\r
-# define malloc_getpagesize (NBPG * CLSIZE)\r
-# endif\r
-# else\r
-# ifdef NBPC\r
-# define malloc_getpagesize NBPC\r
-# else\r
-# ifdef PAGESIZE\r
-# define malloc_getpagesize PAGESIZE\r
-# else /* just guess */\r
-# define malloc_getpagesize ((size_t)4096U)\r
-# endif\r
-# endif\r
-# endif\r
-# endif\r
-# endif\r
-# endif\r
-# endif\r
-#endif\r
-#endif\r
-\r
-/* ------------------- size_t and alignment properties -------------------- */\r
-\r
-/* The byte and bit size of a size_t */\r
-#define SIZE_T_SIZE (sizeof(size_t))\r
-#define SIZE_T_BITSIZE (sizeof(size_t) << 3)\r
-\r
-/* Some constants coerced to size_t */\r
-/* Annoying but necessary to avoid errors on some platforms */\r
-#define SIZE_T_ZERO ((size_t)0)\r
-#define SIZE_T_ONE ((size_t)1)\r
-#define SIZE_T_TWO ((size_t)2)\r
-#define SIZE_T_FOUR ((size_t)4)\r
-#define TWO_SIZE_T_SIZES (SIZE_T_SIZE<<1)\r
-#define FOUR_SIZE_T_SIZES (SIZE_T_SIZE<<2)\r
-#define SIX_SIZE_T_SIZES (FOUR_SIZE_T_SIZES+TWO_SIZE_T_SIZES)\r
-#define HALF_MAX_SIZE_T (MAX_SIZE_T / 2U)\r
-\r
-/* The bit mask value corresponding to MALLOC_ALIGNMENT */\r
-#define CHUNK_ALIGN_MASK (MALLOC_ALIGNMENT - SIZE_T_ONE)\r
-\r
-/* True if address a has acceptable alignment */\r
-#define is_aligned(A) (((size_t)((A)) & (CHUNK_ALIGN_MASK)) == 0)\r
-\r
-/* the number of bytes to offset an address to align it */\r
-#define align_offset(A)\\r
- ((((size_t)(A) & CHUNK_ALIGN_MASK) == 0)? 0 :\\r
- ((MALLOC_ALIGNMENT - ((size_t)(A) & CHUNK_ALIGN_MASK)) & CHUNK_ALIGN_MASK))\r
-\r
-/* -------------------------- MMAP preliminaries ------------------------- */\r
-\r
-/*\r
- If HAVE_MORECORE or HAVE_MMAP are false, we just define calls and\r
- checks to fail so compiler optimizer can delete code rather than\r
- using so many "#if"s.\r
-*/\r
-\r
-\r
-/* MORECORE and MMAP must return MFAIL on failure */\r
-#define MFAIL ((void*)(MAX_SIZE_T))\r
-#define CMFAIL ((char*)(MFAIL)) /* defined for convenience */\r
-\r
-#if HAVE_MMAP\r
-\r
-#ifdef MMAP_DEFAULT\r
-#elif !defined(WIN32)\r
-#define MUNMAP_DEFAULT(a, s) munmap((a), (s))\r
-#define MMAP_PROT (PROT_READ|PROT_WRITE)\r
-#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)\r
-#define MAP_ANONYMOUS MAP_ANON\r
-#endif /* MAP_ANON */\r
-#ifdef MAP_ANONYMOUS\r
-#define MMAP_FLAGS (MAP_PRIVATE|MAP_ANONYMOUS)\r
-#define MMAP_DEFAULT(s) mmap(0, (s), MMAP_PROT, MMAP_FLAGS, -1, 0)\r
-#else /* MAP_ANONYMOUS */\r
-/*\r
- Nearly all versions of mmap support MAP_ANONYMOUS, so the following\r
- is unlikely to be needed, but is supplied just in case.\r
-*/\r
-#define MMAP_FLAGS (MAP_PRIVATE)\r
-#define MMAP_DEFAULT(s) ((dev_zero_fd < 0) ? \\r
- (dev_zero_fd = open("/dev/zero", O_RDWR), \\r
- mmap(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0)) : \\r
- mmap(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0))\r
-#endif /* MAP_ANONYMOUS */\r
-\r
-#define DIRECT_MMAP_DEFAULT(s) MMAP_DEFAULT(s)\r
-\r
-#else /* WIN32 */\r
-\r
-/* Win32 MMAP via VirtualAlloc */\r
-static FORCEINLINE void* win32mmap(size_t size) {\r
- void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);\r
- return (ptr != 0)? ptr: MFAIL;\r
-}\r
-\r
-/* For direct MMAP, use MEM_TOP_DOWN to minimize interference */\r
-static FORCEINLINE void* win32direct_mmap(size_t size) {\r
- void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN,\r
- PAGE_READWRITE);\r
- return (ptr != 0)? ptr: MFAIL;\r
-}\r
-\r
-/* This function supports releasing coalesed segments */\r
-static FORCEINLINE int win32munmap(void* ptr, size_t size) {\r
- MEMORY_BASIC_INFORMATION minfo;\r
- char* cptr = (char*)ptr;\r
- while (size) {\r
- if (VirtualQuery(cptr, &minfo, sizeof(minfo)) == 0)\r
- return -1;\r
- if (minfo.BaseAddress != cptr || minfo.AllocationBase != cptr ||\r
- minfo.State != MEM_COMMIT || minfo.RegionSize > size)\r
- return -1;\r
- if (VirtualFree(cptr, 0, MEM_RELEASE) == 0)\r
- return -1;\r
- cptr += minfo.RegionSize;\r
- size -= minfo.RegionSize;\r
- }\r
- return 0;\r
-}\r
-\r
-#define MMAP_DEFAULT(s) win32mmap(s)\r
-#define MUNMAP_DEFAULT(a, s) win32munmap((a), (s))\r
-#define DIRECT_MMAP_DEFAULT(s) win32direct_mmap(s)\r
-#endif /* WIN32 */\r
-#endif /* HAVE_MMAP */\r
-\r
-#if HAVE_MREMAP && !defined(MREMAP_DEFAULT)\r
-#ifndef WIN32\r
-#define MREMAP_DEFAULT(addr, osz, nsz, mv) mremap((addr), (osz), (nsz), (mv))\r
-#endif /* WIN32 */\r
-#endif /* HAVE_MREMAP */\r
-\r
-/**\r
- * Define CALL_MORECORE\r
- */\r
-#if HAVE_MORECORE\r
- #ifdef MORECORE\r
- #define CALL_MORECORE(S) MORECORE(S)\r
- #else /* MORECORE */\r
- #define CALL_MORECORE(S) MORECORE_DEFAULT(S)\r
- #endif /* MORECORE */\r
-#else /* HAVE_MORECORE */\r
- #define CALL_MORECORE(S) MFAIL\r
-#endif /* HAVE_MORECORE */\r
-\r
-/**\r
- * Define CALL_MMAP/CALL_MUNMAP/CALL_DIRECT_MMAP\r
- */\r
-#if HAVE_MMAP\r
- #define USE_MMAP_BIT (SIZE_T_ONE)\r
-\r
- #ifdef MMAP\r
- #define CALL_MMAP(s) MMAP(s)\r
- #else /* MMAP */\r
- #define CALL_MMAP(s) MMAP_DEFAULT(s)\r
- #endif /* MMAP */\r
- #ifdef MUNMAP\r
- #define CALL_MUNMAP(a, s) MUNMAP((a), (s))\r
- #else /* MUNMAP */\r
- #define CALL_MUNMAP(a, s) MUNMAP_DEFAULT((a), (s))\r
- #endif /* MUNMAP */\r
- #ifdef DIRECT_MMAP\r
- #define CALL_DIRECT_MMAP(s) DIRECT_MMAP(s)\r
- #else /* DIRECT_MMAP */\r
- #define CALL_DIRECT_MMAP(s) DIRECT_MMAP_DEFAULT(s)\r
- #endif /* DIRECT_MMAP */\r
-#else /* HAVE_MMAP */\r
- #define USE_MMAP_BIT (SIZE_T_ZERO)\r
-\r
- #define MMAP(s) MFAIL\r
- #define MUNMAP(a, s) (-1)\r
- #define DIRECT_MMAP(s) MFAIL\r
- #define CALL_DIRECT_MMAP(s) DIRECT_MMAP(s)\r
- #define CALL_MMAP(s) MMAP(s)\r
- #define CALL_MUNMAP(a, s) MUNMAP((a), (s))\r
-#endif /* HAVE_MMAP */\r
-\r
-/**\r
- * Define CALL_MREMAP\r
- */\r
-#if HAVE_MMAP && HAVE_MREMAP\r
- #ifdef MREMAP\r
- #define CALL_MREMAP(addr, osz, nsz, mv) MREMAP((addr), (osz), (nsz), (mv))\r
- #else /* MREMAP */\r
- #define CALL_MREMAP(addr, osz, nsz, mv) MREMAP_DEFAULT((addr), (osz), (nsz), (mv))\r
- #endif /* MREMAP */\r
-#else /* HAVE_MMAP && HAVE_MREMAP */\r
- #define CALL_MREMAP(addr, osz, nsz, mv) MFAIL\r
-#endif /* HAVE_MMAP && HAVE_MREMAP */\r
-\r
-/* mstate bit set if continguous morecore disabled or failed */\r
-#define USE_NONCONTIGUOUS_BIT (4U)\r
-\r
-/* segment bit set in create_mspace_with_base */\r
-#define EXTERN_BIT (8U)\r
-\r
-\r
-/* --------------------------- Lock preliminaries ------------------------ */\r
-\r
-/*\r
- When locks are defined, there is one global lock, plus\r
- one per-mspace lock.\r
-\r
- The global lock_ensures that mparams.magic and other unique\r
- mparams values are initialized only once. It also protects\r
- sequences of calls to MORECORE. In many cases sys_alloc requires\r
- two calls, that should not be interleaved with calls by other\r
- threads. This does not protect against direct calls to MORECORE\r
- by other threads not using this lock, so there is still code to\r
- cope the best we can on interference.\r
-\r
- Per-mspace locks surround calls to malloc, free, etc.\r
- By default, locks are simple non-reentrant mutexes.\r
-\r
- Because lock-protected regions generally have bounded times, it is\r
- OK to use the supplied simple spinlocks. Spinlocks are likely to\r
- improve performance for lightly contended applications, but worsen\r
- performance under heavy contention.\r
-\r
- If USE_LOCKS is > 1, the definitions of lock routines here are\r
- bypassed, in which case you will need to define the type MLOCK_T,\r
- and at least INITIAL_LOCK, DESTROY_LOCK, ACQUIRE_LOCK, RELEASE_LOCK\r
- and TRY_LOCK. You must also declare a\r
- static MLOCK_T malloc_global_mutex = { initialization values };.\r
-\r
-*/\r
-\r
-#if !USE_LOCKS\r
-#define USE_LOCK_BIT (0U)\r
-#define INITIAL_LOCK(l) (0)\r
-#define DESTROY_LOCK(l) (0)\r
-#define ACQUIRE_MALLOC_GLOBAL_LOCK()\r
-#define RELEASE_MALLOC_GLOBAL_LOCK()\r
-\r
-#else\r
-#if USE_LOCKS > 1\r
-/* ----------------------- User-defined locks ------------------------ */\r
-/* Define your own lock implementation here */\r
-/* #define INITIAL_LOCK(lk) ... */\r
-/* #define DESTROY_LOCK(lk) ... */\r
-/* #define ACQUIRE_LOCK(lk) ... */\r
-/* #define RELEASE_LOCK(lk) ... */\r
-/* #define TRY_LOCK(lk) ... */\r
-/* static MLOCK_T malloc_global_mutex = ... */\r
-\r
-#elif USE_SPIN_LOCKS\r
-\r
-/* First, define CAS_LOCK and CLEAR_LOCK on ints */\r
-/* Note CAS_LOCK defined to return 0 on success */\r
-\r
-#if defined(__GNUC__)&& (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1))\r
-#define CAS_LOCK(sl) __sync_lock_test_and_set(sl, 1)\r
-#define CLEAR_LOCK(sl) __sync_lock_release(sl)\r
-\r
-#elif (defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)))\r
-/* Custom spin locks for older gcc on x86 */\r
-static FORCEINLINE int x86_cas_lock(int *sl) {\r
- int ret;\r
- int val = 1;\r
- int cmp = 0;\r
- __asm__ __volatile__ ("lock; cmpxchgl %1, %2"\r
- : "=a" (ret)\r
- : "r" (val), "m" (*(sl)), "0"(cmp)\r
- : "memory", "cc");\r
- return ret;\r
-}\r
-\r
-static FORCEINLINE void x86_clear_lock(int* sl) {\r
- assert(*sl != 0);\r
- int prev = 0;\r
- int ret;\r
- __asm__ __volatile__ ("lock; xchgl %0, %1"\r
- : "=r" (ret)\r
- : "m" (*(sl)), "0"(prev)\r
- : "memory");\r
-}\r
-\r
-#define CAS_LOCK(sl) x86_cas_lock(sl)\r
-#define CLEAR_LOCK(sl) x86_clear_lock(sl)\r
-\r
-#else /* Win32 MSC */\r
-#define CAS_LOCK(sl) interlockedexchange(sl, 1)\r
-#define CLEAR_LOCK(sl) interlockedexchange (sl, 0)\r
-\r
-#endif /* ... gcc spins locks ... */\r
-\r
-/* How to yield for a spin lock */\r
-#define SPINS_PER_YIELD 63\r
-#if defined(_MSC_VER)\r
-#define SLEEP_EX_DURATION 50 /* delay for yield/sleep */\r
-#define SPIN_LOCK_YIELD SleepEx(SLEEP_EX_DURATION, FALSE)\r
-#elif defined (__SVR4) && defined (__sun) /* solaris */\r
-#define SPIN_LOCK_YIELD thr_yield();\r
-#elif !defined(LACKS_SCHED_H)\r
-#define SPIN_LOCK_YIELD sched_yield();\r
-#else\r
-#define SPIN_LOCK_YIELD\r
-#endif /* ... yield ... */\r
-\r
-#if !defined(USE_RECURSIVE_LOCKS) || USE_RECURSIVE_LOCKS == 0\r
-/* Plain spin locks use single word (embedded in malloc_states) */\r
-static int spin_acquire_lock(int *sl) {\r
- int spins = 0;\r
- while (*(volatile int *)sl != 0 || CAS_LOCK(sl)) {\r
- if ((++spins & SPINS_PER_YIELD) == 0) {\r
- SPIN_LOCK_YIELD;\r
- }\r
- }\r
- return 0;\r
-}\r
-\r
-#define MLOCK_T int\r
-#define TRY_LOCK(sl) !CAS_LOCK(sl)\r
-#define RELEASE_LOCK(sl) CLEAR_LOCK(sl)\r
-#define ACQUIRE_LOCK(sl) (CAS_LOCK(sl)? spin_acquire_lock(sl) : 0)\r
-#define INITIAL_LOCK(sl) (*sl = 0)\r
-#define DESTROY_LOCK(sl) (0)\r
-static MLOCK_T malloc_global_mutex = 0;\r
-\r
-#else /* USE_RECURSIVE_LOCKS */\r
-/* types for lock owners */\r
-#ifdef WIN32\r
-#define THREAD_ID_T DWORD\r
-#define CURRENT_THREAD GetCurrentThreadId()\r
-#define EQ_OWNER(X,Y) ((X) == (Y))\r
-#else\r
-/*\r
- Note: the following assume that pthread_t is a type that can be\r
- initialized to (casted) zero. If this is not the case, you will need to\r
- somehow redefine these or not use spin locks.\r
-*/\r
-#define THREAD_ID_T pthread_t\r
-#define CURRENT_THREAD pthread_self()\r
-#define EQ_OWNER(X,Y) pthread_equal(X, Y)\r
-#endif\r
-\r
-struct malloc_recursive_lock {\r
- int sl;\r
- unsigned int c;\r
- THREAD_ID_T threadid;\r
-};\r
-\r
-#define MLOCK_T struct malloc_recursive_lock\r
-static MLOCK_T malloc_global_mutex = { 0, 0, (THREAD_ID_T)0};\r
-\r
-static FORCEINLINE void recursive_release_lock(MLOCK_T *lk) {\r
- assert(lk->sl != 0);\r
- if (--lk->c == 0) {\r
- CLEAR_LOCK(&lk->sl);\r
- }\r
-}\r
-\r
-static FORCEINLINE int recursive_acquire_lock(MLOCK_T *lk) {\r
- THREAD_ID_T mythreadid = CURRENT_THREAD;\r
- int spins = 0;\r
- for (;;) {\r
- if (*((volatile int *)(&lk->sl)) == 0) {\r
- if (!CAS_LOCK(&lk->sl)) {\r
- lk->threadid = mythreadid;\r
- lk->c = 1;\r
- return 0;\r
- }\r
- }\r
- else if (EQ_OWNER(lk->threadid, mythreadid)) {\r
- ++lk->c;\r
- return 0;\r
- }\r
- if ((++spins & SPINS_PER_YIELD) == 0) {\r
- SPIN_LOCK_YIELD;\r
- }\r
- }\r
-}\r
-\r
-static FORCEINLINE int recursive_try_lock(MLOCK_T *lk) {\r
- THREAD_ID_T mythreadid = CURRENT_THREAD;\r
- if (*((volatile int *)(&lk->sl)) == 0) {\r
- if (!CAS_LOCK(&lk->sl)) {\r
- lk->threadid = mythreadid;\r
- lk->c = 1;\r
- return 1;\r
- }\r
- }\r
- else if (EQ_OWNER(lk->threadid, mythreadid)) {\r
- ++lk->c;\r
- return 1;\r
- }\r
- return 0;\r
-}\r
-\r
-#define RELEASE_LOCK(lk) recursive_release_lock(lk)\r
-#define TRY_LOCK(lk) recursive_try_lock(lk)\r
-#define ACQUIRE_LOCK(lk) recursive_acquire_lock(lk)\r
-#define INITIAL_LOCK(lk) ((lk)->threadid = (THREAD_ID_T)0, (lk)->sl = 0, (lk)->c = 0)\r
-#define DESTROY_LOCK(lk) (0)\r
-#endif /* USE_RECURSIVE_LOCKS */\r
-\r
-#elif defined(WIN32) /* Win32 critical sections */\r
-#define MLOCK_T CRITICAL_SECTION\r
-#define ACQUIRE_LOCK(lk) (EnterCriticalSection(lk), 0)\r
-#define RELEASE_LOCK(lk) LeaveCriticalSection(lk)\r
-#define TRY_LOCK(lk) TryEnterCriticalSection(lk)\r
-#define INITIAL_LOCK(lk) (!InitializeCriticalSectionAndSpinCount((lk), 0x80000000|4000))\r
-#define DESTROY_LOCK(lk) (DeleteCriticalSection(lk), 0)\r
-#define NEED_GLOBAL_LOCK_INIT\r
-\r
-static MLOCK_T malloc_global_mutex;\r
-static volatile long malloc_global_mutex_status;\r
-\r
-/* Use spin loop to initialize global lock */\r
-static void init_malloc_global_mutex() {\r
- for (;;) {\r
- long stat = malloc_global_mutex_status;\r
- if (stat > 0)\r
- return;\r
- /* transition to < 0 while initializing, then to > 0) */\r
- if (stat == 0 &&\r
- interlockedcompareexchange(&malloc_global_mutex_status, -1, 0) == 0) {\r
- InitializeCriticalSection(&malloc_global_mutex);\r
- interlockedexchange(&malloc_global_mutex_status,1);\r
- return;\r
- }\r
- SleepEx(0, FALSE);\r
- }\r
-}\r
-\r
-#else /* pthreads-based locks */\r
-#define MLOCK_T pthread_mutex_t\r
-#define ACQUIRE_LOCK(lk) pthread_mutex_lock(lk)\r
-#define RELEASE_LOCK(lk) pthread_mutex_unlock(lk)\r
-#define TRY_LOCK(lk) (!pthread_mutex_trylock(lk))\r
-#define INITIAL_LOCK(lk) pthread_init_lock(lk)\r
-#define DESTROY_LOCK(lk) pthread_mutex_destroy(lk)\r
-\r
-#if defined(USE_RECURSIVE_LOCKS) && USE_RECURSIVE_LOCKS != 0 && defined(linux) && !defined(PTHREAD_MUTEX_RECURSIVE)\r
-/* Cope with old-style linux recursive lock initialization by adding */\r
-/* skipped internal declaration from pthread.h */\r
-extern int pthread_mutexattr_setkind_np __P ((pthread_mutexattr_t *__attr,\r
- int __kind));\r
-#define PTHREAD_MUTEX_RECURSIVE PTHREAD_MUTEX_RECURSIVE_NP\r
-#define pthread_mutexattr_settype(x,y) pthread_mutexattr_setkind_np(x,y)\r
-#endif /* USE_RECURSIVE_LOCKS ... */\r
-\r
-static MLOCK_T malloc_global_mutex = PTHREAD_MUTEX_INITIALIZER;\r
-\r
-static int pthread_init_lock (MLOCK_T *lk) {\r
- pthread_mutexattr_t attr;\r
- if (pthread_mutexattr_init(&attr)) return 1;\r
-#if defined(USE_RECURSIVE_LOCKS) && USE_RECURSIVE_LOCKS != 0\r
- if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE)) return 1;\r
-#endif\r
- if (pthread_mutex_init(lk, &attr)) return 1;\r
- if (pthread_mutexattr_destroy(&attr)) return 1;\r
- return 0;\r
-}\r
-\r
-#endif /* ... lock types ... */\r
-\r
-/* Common code for all lock types */\r
-#define USE_LOCK_BIT (2U)\r
-\r
-#ifndef ACQUIRE_MALLOC_GLOBAL_LOCK\r
-#define ACQUIRE_MALLOC_GLOBAL_LOCK() ACQUIRE_LOCK(&malloc_global_mutex);\r
-#endif\r
-\r
-#ifndef RELEASE_MALLOC_GLOBAL_LOCK\r
-#define RELEASE_MALLOC_GLOBAL_LOCK() RELEASE_LOCK(&malloc_global_mutex);\r
-#endif\r
-\r
-#endif /* USE_LOCKS */\r
-\r
-/* ----------------------- Chunk representations ------------------------ */\r
-\r
-/*\r
- (The following includes lightly edited explanations by Colin Plumb.)\r
-\r
- The malloc_chunk declaration below is misleading (but accurate and\r
- necessary). It declares a "view" into memory allowing access to\r
- necessary fields at known offsets from a given base.\r
-\r
- Chunks of memory are maintained using a `boundary tag' method as\r
- originally described by Knuth. (See the paper by Paul Wilson\r
- ftp://ftp.cs.utexas.edu/pub/garbage/allocsrv.ps for a survey of such\r
- techniques.) Sizes of free chunks are stored both in the front of\r
- each chunk and at the end. This makes consolidating fragmented\r
- chunks into bigger chunks fast. The head fields also hold bits\r
- representing whether chunks are free or in use.\r
-\r
- Here are some pictures to make it clearer. They are "exploded" to\r
- show that the state of a chunk can be thought of as extending from\r
- the high 31 bits of the head field of its header through the\r
- prev_foot and PINUSE_BIT bit of the following chunk header.\r
-\r
- A chunk that's in use looks like:\r
-\r
- chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Size of previous chunk (if P = 0) |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P|\r
- | Size of this chunk 1| +-+\r
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | |\r
- +- -+\r
- | |\r
- +- -+\r
- | :\r
- +- size - sizeof(size_t) available payload bytes -+\r
- : |\r
- chunk-> +- -+\r
- | |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|\r
- | Size of next chunk (may or may not be in use) | +-+\r
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
-\r
- And if it's free, it looks like this:\r
-\r
- chunk-> +- -+\r
- | User payload (must be in use, or we would have merged!) |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P|\r
- | Size of this chunk 0| +-+\r
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Next pointer |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Prev pointer |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | :\r
- +- size - sizeof(struct chunk) unused bytes -+\r
- : |\r
- chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Size of this chunk |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|\r
- | Size of next chunk (must be in use, or we would have merged)| +-+\r
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | :\r
- +- User payload -+\r
- : |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- |0|\r
- +-+\r
- Note that since we always merge adjacent free chunks, the chunks\r
- adjacent to a free chunk must be in use.\r
-\r
- Given a pointer to a chunk (which can be derived trivially from the\r
- payload pointer) we can, in O(1) time, find out whether the adjacent\r
- chunks are free, and if so, unlink them from the lists that they\r
- are on and merge them with the current chunk.\r
-\r
- Chunks always begin on even word boundaries, so the mem portion\r
- (which is returned to the user) is also on an even word boundary, and\r
- thus at least double-word aligned.\r
-\r
- The P (PINUSE_BIT) bit, stored in the unused low-order bit of the\r
- chunk size (which is always a multiple of two words), is an in-use\r
- bit for the *previous* chunk. If that bit is *clear*, then the\r
- word before the current chunk size contains the previous chunk\r
- size, and can be used to find the front of the previous chunk.\r
- The very first chunk allocated always has this bit set, preventing\r
- access to non-existent (or non-owned) memory. If pinuse is set for\r
- any given chunk, then you CANNOT determine the size of the\r
- previous chunk, and might even get a memory addressing fault when\r
- trying to do so.\r
-\r
- The C (CINUSE_BIT) bit, stored in the unused second-lowest bit of\r
- the chunk size redundantly records whether the current chunk is\r
- inuse (unless the chunk is mmapped). This redundancy enables usage\r
- checks within free and realloc, and reduces indirection when freeing\r
- and consolidating chunks.\r
-\r
- Each freshly allocated chunk must have both cinuse and pinuse set.\r
- That is, each allocated chunk borders either a previously allocated\r
- and still in-use chunk, or the base of its memory arena. This is\r
- ensured by making all allocations from the `lowest' part of any\r
- found chunk. Further, no free chunk physically borders another one,\r
- so each free chunk is known to be preceded and followed by either\r
- inuse chunks or the ends of memory.\r
-\r
- Note that the `foot' of the current chunk is actually represented\r
- as the prev_foot of the NEXT chunk. This makes it easier to\r
- deal with alignments etc but can be very confusing when trying\r
- to extend or adapt this code.\r
-\r
- The exceptions to all this are\r
-\r
- 1. The special chunk `top' is the top-most available chunk (i.e.,\r
- the one bordering the end of available memory). It is treated\r
- specially. Top is never included in any bin, is used only if\r
- no other chunk is available, and is released back to the\r
- system if it is very large (see M_TRIM_THRESHOLD). In effect,\r
- the top chunk is treated as larger (and thus less well\r
- fitting) than any other available chunk. The top chunk\r
- doesn't update its trailing size field since there is no next\r
- contiguous chunk that would have to index off it. However,\r
- space is still allocated for it (TOP_FOOT_SIZE) to enable\r
- separation or merging when space is extended.\r
-\r
- 3. Chunks allocated via mmap, have both cinuse and pinuse bits\r
- cleared in their head fields. Because they are allocated\r
- one-by-one, each must carry its own prev_foot field, which is\r
- also used to hold the offset this chunk has within its mmapped\r
- region, which is needed to preserve alignment. Each mmapped\r
- chunk is trailed by the first two fields of a fake next-chunk\r
- for sake of usage checks.\r
-\r
-*/\r
-\r
-struct malloc_chunk {\r
- size_t prev_foot; /* Size of previous chunk (if free). */\r
- size_t head; /* Size and inuse bits. */\r
- struct malloc_chunk* fd; /* double links -- used only if free. */\r
- struct malloc_chunk* bk;\r
-};\r
-\r
-typedef struct malloc_chunk mchunk;\r
-typedef struct malloc_chunk* mchunkptr;\r
-typedef struct malloc_chunk* sbinptr; /* The type of bins of chunks */\r
-typedef unsigned int bindex_t; /* Described below */\r
-typedef unsigned int binmap_t; /* Described below */\r
-typedef unsigned int flag_t; /* The type of various bit flag sets */\r
-\r
-/* ------------------- Chunks sizes and alignments ----------------------- */\r
-\r
-#define MCHUNK_SIZE (sizeof(mchunk))\r
-\r
-#if FOOTERS\r
-#define CHUNK_OVERHEAD (TWO_SIZE_T_SIZES)\r
-#else /* FOOTERS */\r
-#define CHUNK_OVERHEAD (SIZE_T_SIZE)\r
-#endif /* FOOTERS */\r
-\r
-/* MMapped chunks need a second word of overhead ... */\r
-#define MMAP_CHUNK_OVERHEAD (TWO_SIZE_T_SIZES)\r
-/* ... and additional padding for fake next-chunk at foot */\r
-#define MMAP_FOOT_PAD (FOUR_SIZE_T_SIZES)\r
-\r
-/* The smallest size we can malloc is an aligned minimal chunk */\r
-#define MIN_CHUNK_SIZE\\r
- ((MCHUNK_SIZE + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK)\r
-\r
-/* conversion from malloc headers to user pointers, and back */\r
-#define chunk2mem(p) ((void*)((char*)(p) + TWO_SIZE_T_SIZES))\r
-#define mem2chunk(mem) ((mchunkptr)((char*)(mem) - TWO_SIZE_T_SIZES))\r
-/* chunk associated with aligned address A */\r
-#define align_as_chunk(A) (mchunkptr)((A) + align_offset(chunk2mem(A)))\r
-\r
-/* Bounds on request (not chunk) sizes. */\r
-#define MAX_REQUEST ((-MIN_CHUNK_SIZE) << 2)\r
-#define MIN_REQUEST (MIN_CHUNK_SIZE - CHUNK_OVERHEAD - SIZE_T_ONE)\r
-\r
-/* pad request bytes into a usable size */\r
-#define pad_request(req) \\r
- (((req) + CHUNK_OVERHEAD + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK)\r
-\r
-/* pad request, checking for minimum (but not maximum) */\r
-#define request2size(req) \\r
- (((req) < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(req))\r
-\r
-\r
-/* ------------------ Operations on head and foot fields ----------------- */\r
-\r
-/*\r
- The head field of a chunk is or'ed with PINUSE_BIT when previous\r
- adjacent chunk in use, and or'ed with CINUSE_BIT if this chunk is in\r
- use, unless mmapped, in which case both bits are cleared.\r
-\r
- FLAG4_BIT is not used by this malloc, but might be useful in extensions.\r
-*/\r
-\r
-#define PINUSE_BIT (SIZE_T_ONE)\r
-#define CINUSE_BIT (SIZE_T_TWO)\r
-#define FLAG4_BIT (SIZE_T_FOUR)\r
-#define INUSE_BITS (PINUSE_BIT|CINUSE_BIT)\r
-#define FLAG_BITS (PINUSE_BIT|CINUSE_BIT|FLAG4_BIT)\r
-\r
-/* Head value for fenceposts */\r
-#define FENCEPOST_HEAD (INUSE_BITS|SIZE_T_SIZE)\r
-\r
-/* extraction of fields from head words */\r
-#define cinuse(p) ((p)->head & CINUSE_BIT)\r
-#define pinuse(p) ((p)->head & PINUSE_BIT)\r
-#define flag4inuse(p) ((p)->head & FLAG4_BIT)\r
-#define is_inuse(p) (((p)->head & INUSE_BITS) != PINUSE_BIT)\r
-#define is_mmapped(p) (((p)->head & INUSE_BITS) == 0)\r
-\r
-#define chunksize(p) ((p)->head & ~(FLAG_BITS))\r
-\r
-#define clear_pinuse(p) ((p)->head &= ~PINUSE_BIT)\r
-#define set_flag4(p) ((p)->head |= FLAG4_BIT)\r
-#define clear_flag4(p) ((p)->head &= ~FLAG4_BIT)\r
-\r
-/* Treat space at ptr +/- offset as a chunk */\r
-#define chunk_plus_offset(p, s) ((mchunkptr)(((char*)(p)) + (s)))\r
-#define chunk_minus_offset(p, s) ((mchunkptr)(((char*)(p)) - (s)))\r
-\r
-/* Ptr to next or previous physical malloc_chunk. */\r
-#define next_chunk(p) ((mchunkptr)( ((char*)(p)) + ((p)->head & ~FLAG_BITS)))\r
-#define prev_chunk(p) ((mchunkptr)( ((char*)(p)) - ((p)->prev_foot) ))\r
-\r
-/* extract next chunk's pinuse bit */\r
-#define next_pinuse(p) ((next_chunk(p)->head) & PINUSE_BIT)\r
-\r
-/* Get/set size at footer */\r
-#define get_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot)\r
-#define set_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot = (s))\r
-\r
-/* Set size, pinuse bit, and foot */\r
-#define set_size_and_pinuse_of_free_chunk(p, s)\\r
- ((p)->head = (s|PINUSE_BIT), set_foot(p, s))\r
-\r
-/* Set size, pinuse bit, foot, and clear next pinuse */\r
-#define set_free_with_pinuse(p, s, n)\\r
- (clear_pinuse(n), set_size_and_pinuse_of_free_chunk(p, s))\r
-\r
-/* Get the internal overhead associated with chunk p */\r
-#define overhead_for(p)\\r
- (is_mmapped(p)? MMAP_CHUNK_OVERHEAD : CHUNK_OVERHEAD)\r
-\r
-/* Return true if malloced space is not necessarily cleared */\r
-#if MMAP_CLEARS\r
-#define calloc_must_clear(p) (!is_mmapped(p))\r
-#else /* MMAP_CLEARS */\r
-#define calloc_must_clear(p) (1)\r
-#endif /* MMAP_CLEARS */\r
-\r
-/* ---------------------- Overlaid data structures ----------------------- */\r
-\r
-/*\r
- When chunks are not in use, they are treated as nodes of either\r
- lists or trees.\r
-\r
- "Small" chunks are stored in circular doubly-linked lists, and look\r
- like this:\r
-\r
- chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Size of previous chunk |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- `head:' | Size of chunk, in bytes |P|\r
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Forward pointer to next chunk in list |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Back pointer to previous chunk in list |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Unused space (may be 0 bytes long) .\r
- . .\r
- . |\r
-nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- `foot:' | Size of chunk, in bytes |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
-\r
- Larger chunks are kept in a form of bitwise digital trees (aka\r
- tries) keyed on chunksizes. Because malloc_tree_chunks are only for\r
- free chunks greater than 256 bytes, their size doesn't impose any\r
- constraints on user chunk sizes. Each node looks like:\r
-\r
- chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Size of previous chunk |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- `head:' | Size of chunk, in bytes |P|\r
- mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Forward pointer to next chunk of same size |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Back pointer to previous chunk of same size |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Pointer to left child (child[0]) |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Pointer to right child (child[1]) |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Pointer to parent |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | bin index of this chunk |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- | Unused space .\r
- . |\r
-nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
- `foot:' | Size of chunk, in bytes |\r
- +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+\r
-\r
- Each tree holding treenodes is a tree of unique chunk sizes. Chunks\r
- of the same size are arranged in a circularly-linked list, with only\r
- the oldest chunk (the next to be used, in our FIFO ordering)\r
- actually in the tree. (Tree members are distinguished by a non-null\r
- parent pointer.) If a chunk with the same size an an existing node\r
- is inserted, it is linked off the existing node using pointers that\r
- work in the same way as fd/bk pointers of small chunks.\r
-\r
- Each tree contains a power of 2 sized range of chunk sizes (the\r
- smallest is 0x100 <= x < 0x180), which is is divided in half at each\r
- tree level, with the chunks in the smaller half of the range (0x100\r
- <= x < 0x140 for the top nose) in the left subtree and the larger\r
- half (0x140 <= x < 0x180) in the right subtree. This is, of course,\r
- done by inspecting individual bits.\r
-\r
- Using these rules, each node's left subtree contains all smaller\r
- sizes than its right subtree. However, the node at the root of each\r
- subtree has no particular ordering relationship to either. (The\r
- dividing line between the subtree sizes is based on trie relation.)\r
- If we remove the last chunk of a given size from the interior of the\r
- tree, we need to replace it with a leaf node. The tree ordering\r
- rules permit a node to be replaced by any leaf below it.\r
-\r
- The smallest chunk in a tree (a common operation in a best-fit\r
- allocator) can be found by walking a path to the leftmost leaf in\r
- the tree. Unlike a usual binary tree, where we follow left child\r
- pointers until we reach a null, here we follow the right child\r
- pointer any time the left one is null, until we reach a leaf with\r
- both child pointers null. The smallest chunk in the tree will be\r
- somewhere along that path.\r
-\r
- The worst case number of steps to add, find, or remove a node is\r
- bounded by the number of bits differentiating chunks within\r
- bins. Under current bin calculations, this ranges from 6 up to 21\r
- (for 32 bit sizes) or up to 53 (for 64 bit sizes). The typical case\r
- is of course much better.\r
-*/\r
-\r
-struct malloc_tree_chunk {\r
- /* The first four fields must be compatible with malloc_chunk */\r
- size_t prev_foot;\r
- size_t head;\r
- struct malloc_tree_chunk* fd;\r
- struct malloc_tree_chunk* bk;\r
-\r
- struct malloc_tree_chunk* child[2];\r
- struct malloc_tree_chunk* parent;\r
- bindex_t index;\r
-};\r
-\r
-typedef struct malloc_tree_chunk tchunk;\r
-typedef struct malloc_tree_chunk* tchunkptr;\r
-typedef struct malloc_tree_chunk* tbinptr; /* The type of bins of trees */\r
-\r
-/* A little helper macro for trees */\r
-#define leftmost_child(t) ((t)->child[0] != 0? (t)->child[0] : (t)->child[1])\r
-\r
-/* ----------------------------- Segments -------------------------------- */\r
-\r
-/*\r
- Each malloc space may include non-contiguous segments, held in a\r
- list headed by an embedded malloc_segment record representing the\r
- top-most space. Segments also include flags holding properties of\r
- the space. Large chunks that are directly allocated by mmap are not\r
- included in this list. They are instead independently created and\r
- destroyed without otherwise keeping track of them.\r
-\r
- Segment management mainly comes into play for spaces allocated by\r
- MMAP. Any call to MMAP might or might not return memory that is\r
- adjacent to an existing segment. MORECORE normally contiguously\r
- extends the current space, so this space is almost always adjacent,\r
- which is simpler and faster to deal with. (This is why MORECORE is\r
- used preferentially to MMAP when both are available -- see\r
- sys_alloc.) When allocating using MMAP, we don't use any of the\r
- hinting mechanisms (inconsistently) supported in various\r
- implementations of unix mmap, or distinguish reserving from\r
- committing memory. Instead, we just ask for space, and exploit\r
- contiguity when we get it. It is probably possible to do\r
- better than this on some systems, but no general scheme seems\r
- to be significantly better.\r
-\r
- Management entails a simpler variant of the consolidation scheme\r
- used for chunks to reduce fragmentation -- new adjacent memory is\r
- normally prepended or appended to an existing segment. However,\r
- there are limitations compared to chunk consolidation that mostly\r
- reflect the fact that segment processing is relatively infrequent\r
- (occurring only when getting memory from system) and that we\r
- don't expect to have huge numbers of segments:\r
-\r
- * Segments are not indexed, so traversal requires linear scans. (It\r
- would be possible to index these, but is not worth the extra\r
- overhead and complexity for most programs on most platforms.)\r
- * New segments are only appended to old ones when holding top-most\r
- memory; if they cannot be prepended to others, they are held in\r
- different segments.\r
-\r
- Except for the top-most segment of an mstate, each segment record\r
- is kept at the tail of its segment. Segments are added by pushing\r
- segment records onto the list headed by &mstate.seg for the\r
- containing mstate.\r
-\r
- Segment flags control allocation/merge/deallocation policies:\r
- * If EXTERN_BIT set, then we did not allocate this segment,\r
- and so should not try to deallocate or merge with others.\r
- (This currently holds only for the initial segment passed\r
- into create_mspace_with_base.)\r
- * If USE_MMAP_BIT set, the segment may be merged with\r
- other surrounding mmapped segments and trimmed/de-allocated\r
- using munmap.\r
- * If neither bit is set, then the segment was obtained using\r
- MORECORE so can be merged with surrounding MORECORE'd segments\r
- and deallocated/trimmed using MORECORE with negative arguments.\r
-*/\r
-\r
-struct malloc_segment {\r
- char* base; /* base address */\r
- size_t size; /* allocated size */\r
- struct malloc_segment* next; /* ptr to next segment */\r
- flag_t sflags; /* mmap and extern flag */\r
-};\r
-\r
-#define is_mmapped_segment(S) ((S)->sflags & USE_MMAP_BIT)\r
-#define is_extern_segment(S) ((S)->sflags & EXTERN_BIT)\r
-\r
-typedef struct malloc_segment msegment;\r
-typedef struct malloc_segment* msegmentptr;\r
-\r
-/* ---------------------------- malloc_state ----------------------------- */\r
-\r
-/*\r
- A malloc_state holds all of the bookkeeping for a space.\r
- The main fields are:\r
-\r
- Top\r
- The topmost chunk of the currently active segment. Its size is\r
- cached in topsize. The actual size of topmost space is\r
- topsize+TOP_FOOT_SIZE, which includes space reserved for adding\r
- fenceposts and segment records if necessary when getting more\r
- space from the system. The size at which to autotrim top is\r
- cached from mparams in trim_check, except that it is disabled if\r
- an autotrim fails.\r
-\r
- Designated victim (dv)\r
- This is the preferred chunk for servicing small requests that\r
- don't have exact fits. It is normally the chunk split off most\r
- recently to service another small request. Its size is cached in\r
- dvsize. The link fields of this chunk are not maintained since it\r
- is not kept in a bin.\r
-\r
- SmallBins\r
- An array of bin headers for free chunks. These bins hold chunks\r
- with sizes less than MIN_LARGE_SIZE bytes. Each bin contains\r
- chunks of all the same size, spaced 8 bytes apart. To simplify\r
- use in double-linked lists, each bin header acts as a malloc_chunk\r
- pointing to the real first node, if it exists (else pointing to\r
- itself). This avoids special-casing for headers. But to avoid\r
- waste, we allocate only the fd/bk pointers of bins, and then use\r
- repositioning tricks to treat these as the fields of a chunk.\r
-\r
- TreeBins\r
- Treebins are pointers to the roots of trees holding a range of\r
- sizes. There are 2 equally spaced treebins for each power of two\r
- from TREE_SHIFT to TREE_SHIFT+16. The last bin holds anything\r
- larger.\r
-\r
- Bin maps\r
- There is one bit map for small bins ("smallmap") and one for\r
- treebins ("treemap). Each bin sets its bit when non-empty, and\r
- clears the bit when empty. Bit operations are then used to avoid\r
- bin-by-bin searching -- nearly all "search" is done without ever\r
- looking at bins that won't be selected. The bit maps\r
- conservatively use 32 bits per map word, even if on 64bit system.\r
- For a good description of some of the bit-based techniques used\r
- here, see Henry S. Warren Jr's book "Hacker's Delight" (and\r
- supplement at http://hackersdelight.org/). Many of these are\r
- intended to reduce the branchiness of paths through malloc etc, as\r
- well as to reduce the number of memory locations read or written.\r
-\r
- Segments\r
- A list of segments headed by an embedded malloc_segment record\r
- representing the initial space.\r
-\r
- Address check support\r
- The least_addr field is the least address ever obtained from\r
- MORECORE or MMAP. Attempted frees and reallocs of any address less\r
- than this are trapped (unless INSECURE is defined).\r
-\r
- Magic tag\r
- A cross-check field that should always hold same value as mparams.magic.\r
-\r
- Max allowed footprint\r
- The maximum allowed bytes to allocate from system (zero means no limit)\r
-\r
- Flags\r
- Bits recording whether to use MMAP, locks, or contiguous MORECORE\r
-\r
- Statistics\r
- Each space keeps track of current and maximum system memory\r
- obtained via MORECORE or MMAP.\r
-\r
- Trim support\r
- Fields holding the amount of unused topmost memory that should trigger\r
- trimming, and a counter to force periodic scanning to release unused\r
- non-topmost segments.\r
-\r
- Locking\r
- If USE_LOCKS is defined, the "mutex" lock is acquired and released\r
- around every public call using this mspace.\r
-\r
- Extension support\r
- A void* pointer and a size_t field that can be used to help implement\r
- extensions to this malloc.\r
-*/\r
-\r
-/* Bin types, widths and sizes */\r
-#define NSMALLBINS (32U)\r
-#define NTREEBINS (32U)\r
-#define SMALLBIN_SHIFT (3U)\r
-#define SMALLBIN_WIDTH (SIZE_T_ONE << SMALLBIN_SHIFT)\r
-#define TREEBIN_SHIFT (8U)\r
-#define MIN_LARGE_SIZE (SIZE_T_ONE << TREEBIN_SHIFT)\r
-#define MAX_SMALL_SIZE (MIN_LARGE_SIZE - SIZE_T_ONE)\r
-#define MAX_SMALL_REQUEST (MAX_SMALL_SIZE - CHUNK_ALIGN_MASK - CHUNK_OVERHEAD)\r
-\r
-struct malloc_state {\r
- binmap_t smallmap;\r
- binmap_t treemap;\r
- size_t dvsize;\r
- size_t topsize;\r
- char* least_addr;\r
- mchunkptr dv;\r
- mchunkptr top;\r
- size_t trim_check;\r
- size_t release_checks;\r
- size_t magic;\r
- mchunkptr smallbins[(NSMALLBINS+1)*2];\r
- tbinptr treebins[NTREEBINS];\r
- size_t footprint;\r
- size_t max_footprint;\r
- size_t footprint_limit; /* zero means no limit */\r
- flag_t mflags;\r
-#if USE_LOCKS\r
- MLOCK_T mutex; /* locate lock among fields that rarely change */\r
-#endif /* USE_LOCKS */\r
- msegment seg;\r
- void* extp; /* Unused but available for extensions */\r
- size_t exts;\r
-};\r
-\r
-typedef struct malloc_state* mstate;\r
-\r
-/* ------------- Global malloc_state and malloc_params ------------------- */\r
-\r
-/*\r
- malloc_params holds global properties, including those that can be\r
- dynamically set using mallopt. There is a single instance, mparams,\r
- initialized in init_mparams. Note that the non-zeroness of "magic"\r
- also serves as an initialization flag.\r
-*/\r
-\r
-struct malloc_params {\r
- size_t magic;\r
- size_t page_size;\r
- size_t granularity;\r
- size_t mmap_threshold;\r
- size_t trim_threshold;\r
- flag_t default_mflags;\r
-};\r
-\r
-static struct malloc_params mparams;\r
-\r
-/* Ensure mparams initialized */\r
-#define ensure_initialization() (void)(mparams.magic != 0 || init_mparams())\r
-\r
-#if !ONLY_MSPACES\r
-\r
-/* The global malloc_state used for all non-"mspace" calls */\r
-static struct malloc_state _gm_;\r
-#define gm (&_gm_)\r
-#define is_global(M) ((M) == &_gm_)\r
-\r
-#endif /* !ONLY_MSPACES */\r
-\r
-#define is_initialized(M) ((M)->top != 0)\r
-\r
-/* -------------------------- system alloc setup ------------------------- */\r
-\r
-/* Operations on mflags */\r
-\r
-#define use_lock(M) ((M)->mflags & USE_LOCK_BIT)\r
-#define enable_lock(M) ((M)->mflags |= USE_LOCK_BIT)\r
-#if USE_LOCKS\r
-#define disable_lock(M) ((M)->mflags &= ~USE_LOCK_BIT)\r
-#else\r
-#define disable_lock(M)\r
-#endif\r
-\r
-#define use_mmap(M) ((M)->mflags & USE_MMAP_BIT)\r
-#define enable_mmap(M) ((M)->mflags |= USE_MMAP_BIT)\r
-#if HAVE_MMAP\r
-#define disable_mmap(M) ((M)->mflags &= ~USE_MMAP_BIT)\r
-#else\r
-#define disable_mmap(M)\r
-#endif\r
-\r
-#define use_noncontiguous(M) ((M)->mflags & USE_NONCONTIGUOUS_BIT)\r
-#define disable_contiguous(M) ((M)->mflags |= USE_NONCONTIGUOUS_BIT)\r
-\r
-#define set_lock(M,L)\\r
- ((M)->mflags = (L)?\\r
- ((M)->mflags | USE_LOCK_BIT) :\\r
- ((M)->mflags & ~USE_LOCK_BIT))\r
-\r
-/* page-align a size */\r
-#define page_align(S)\\r
- (((S) + (mparams.page_size - SIZE_T_ONE)) & ~(mparams.page_size - SIZE_T_ONE))\r
-\r
-/* granularity-align a size */\r
-#define granularity_align(S)\\r
- (((S) + (mparams.granularity - SIZE_T_ONE))\\r
- & ~(mparams.granularity - SIZE_T_ONE))\r
-\r
-\r
-/* For mmap, use granularity alignment on windows, else page-align */\r
-#ifdef WIN32\r
-#define mmap_align(S) granularity_align(S)\r
-#else\r
-#define mmap_align(S) page_align(S)\r
-#endif\r
-\r
-/* For sys_alloc, enough padding to ensure can malloc request on success */\r
-#define SYS_ALLOC_PADDING (TOP_FOOT_SIZE + MALLOC_ALIGNMENT)\r
-\r
-#define is_page_aligned(S)\\r
- (((size_t)(S) & (mparams.page_size - SIZE_T_ONE)) == 0)\r
-#define is_granularity_aligned(S)\\r
- (((size_t)(S) & (mparams.granularity - SIZE_T_ONE)) == 0)\r
-\r
-/* True if segment S holds address A */\r
-#define segment_holds(S, A)\\r
- ((char*)(A) >= S->base && (char*)(A) < S->base + S->size)\r
-\r
-/* Return segment holding given address */\r
-static msegmentptr segment_holding(mstate m, char* addr) {\r
- msegmentptr sp = &m->seg;\r
- for (;;) {\r
- if (addr >= sp->base && addr < sp->base + sp->size)\r
- return sp;\r
- if ((sp = sp->next) == 0)\r
- return 0;\r
- }\r
-}\r
-\r
-/* Return true if segment contains a segment link */\r
-static int has_segment_link(mstate m, msegmentptr ss) {\r
- msegmentptr sp = &m->seg;\r
- for (;;) {\r
- if ((char*)sp >= ss->base && (char*)sp < ss->base + ss->size)\r
- return 1;\r
- if ((sp = sp->next) == 0)\r
- return 0;\r
- }\r
-}\r
-\r
-#ifndef MORECORE_CANNOT_TRIM\r
-#define should_trim(M,s) ((s) > (M)->trim_check)\r
-#else /* MORECORE_CANNOT_TRIM */\r
-#define should_trim(M,s) (0)\r
-#endif /* MORECORE_CANNOT_TRIM */\r
-\r
-/*\r
- TOP_FOOT_SIZE is padding at the end of a segment, including space\r
- that may be needed to place segment records and fenceposts when new\r
- noncontiguous segments are added.\r
-*/\r
-#define TOP_FOOT_SIZE\\r
- (align_offset(chunk2mem(0))+pad_request(sizeof(struct malloc_segment))+MIN_CHUNK_SIZE)\r
-\r
-\r
-/* ------------------------------- Hooks -------------------------------- */\r
-\r
-/*\r
- PREACTION should be defined to return 0 on success, and nonzero on\r
- failure. If you are not using locking, you can redefine these to do\r
- anything you like.\r
-*/\r
-\r
-#if USE_LOCKS\r
-#define PREACTION(M) ((use_lock(M))? ACQUIRE_LOCK(&(M)->mutex) : 0)\r
-#define POSTACTION(M) { if (use_lock(M)) RELEASE_LOCK(&(M)->mutex); }\r
-#else /* USE_LOCKS */\r
-\r
-#ifndef PREACTION\r
-#define PREACTION(M) (0)\r
-#endif /* PREACTION */\r
-\r
-#ifndef POSTACTION\r
-#define POSTACTION(M)\r
-#endif /* POSTACTION */\r
-\r
-#endif /* USE_LOCKS */\r
-\r
-/*\r
- CORRUPTION_ERROR_ACTION is triggered upon detected bad addresses.\r
- USAGE_ERROR_ACTION is triggered on detected bad frees and\r
- reallocs. The argument p is an address that might have triggered the\r
- fault. It is ignored by the two predefined actions, but might be\r
- useful in custom actions that try to help diagnose errors.\r
-*/\r
-\r
-#if PROCEED_ON_ERROR\r
-\r
-/* A count of the number of corruption errors causing resets */\r
-int malloc_corruption_error_count;\r
-\r
-/* default corruption action */\r
-static void reset_on_error(mstate m);\r
-\r
-#define CORRUPTION_ERROR_ACTION(m) reset_on_error(m)\r
-#define USAGE_ERROR_ACTION(m, p)\r
-\r
-#else /* PROCEED_ON_ERROR */\r
-\r
-#ifndef CORRUPTION_ERROR_ACTION\r
-#define CORRUPTION_ERROR_ACTION(m) ABORT\r
-#endif /* CORRUPTION_ERROR_ACTION */\r
-\r
-#ifndef USAGE_ERROR_ACTION\r
-#define USAGE_ERROR_ACTION(m,p) ABORT\r
-#endif /* USAGE_ERROR_ACTION */\r
-\r
-#endif /* PROCEED_ON_ERROR */\r
-\r
-\r
-/* -------------------------- Debugging setup ---------------------------- */\r
-\r
-#if ! DEBUG\r
-\r
-#define check_free_chunk(M,P)\r
-#define check_inuse_chunk(M,P)\r
-#define check_malloced_chunk(M,P,N)\r
-#define check_mmapped_chunk(M,P)\r
-#define check_malloc_state(M)\r
-#define check_top_chunk(M,P)\r
-\r
-#else /* DEBUG */\r
-#define check_free_chunk(M,P) do_check_free_chunk(M,P)\r
-#define check_inuse_chunk(M,P) do_check_inuse_chunk(M,P)\r
-#define check_top_chunk(M,P) do_check_top_chunk(M,P)\r
-#define check_malloced_chunk(M,P,N) do_check_malloced_chunk(M,P,N)\r
-#define check_mmapped_chunk(M,P) do_check_mmapped_chunk(M,P)\r
-#define check_malloc_state(M) do_check_malloc_state(M)\r
-\r
-static void do_check_any_chunk(mstate m, mchunkptr p);\r
-static void do_check_top_chunk(mstate m, mchunkptr p);\r
-static void do_check_mmapped_chunk(mstate m, mchunkptr p);\r
-static void do_check_inuse_chunk(mstate m, mchunkptr p);\r
-static void do_check_free_chunk(mstate m, mchunkptr p);\r
-static void do_check_malloced_chunk(mstate m, void* mem, size_t s);\r
-static void do_check_tree(mstate m, tchunkptr t);\r
-static void do_check_treebin(mstate m, bindex_t i);\r
-static void do_check_smallbin(mstate m, bindex_t i);\r
-static void do_check_malloc_state(mstate m);\r
-static int bin_find(mstate m, mchunkptr x);\r
-static size_t traverse_and_check(mstate m);\r
-#endif /* DEBUG */\r
-\r
-/* ---------------------------- Indexing Bins ---------------------------- */\r
-\r
-#define is_small(s) (((s) >> SMALLBIN_SHIFT) < NSMALLBINS)\r
-#define small_index(s) (bindex_t)((s) >> SMALLBIN_SHIFT)\r
-#define small_index2size(i) ((i) << SMALLBIN_SHIFT)\r
-#define MIN_SMALL_INDEX (small_index(MIN_CHUNK_SIZE))\r
-\r
-/* addressing by index. See above about smallbin repositioning */\r
-#define smallbin_at(M, i) ((sbinptr)((char*)&((M)->smallbins[(i)<<1])))\r
-#define treebin_at(M,i) (&((M)->treebins[i]))\r
-\r
-/* assign tree index for size S to variable I. Use x86 asm if possible */\r
-#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))\r
-#define compute_tree_index(S, I)\\r
-{\\r
- unsigned int X = S >> TREEBIN_SHIFT;\\r
- if (X == 0)\\r
- I = 0;\\r
- else if (X > 0xFFFF)\\r
- I = NTREEBINS-1;\\r
- else {\\r
- unsigned int K = (unsigned) sizeof(X)*__CHAR_BIT__ - 1 - (unsigned) __builtin_clz(X); \\r
- I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\\r
- }\\r
-}\r
-\r
-#elif defined (__INTEL_COMPILER)\r
-#define compute_tree_index(S, I)\\r
-{\\r
- size_t X = S >> TREEBIN_SHIFT;\\r
- if (X == 0)\\r
- I = 0;\\r
- else if (X > 0xFFFF)\\r
- I = NTREEBINS-1;\\r
- else {\\r
- unsigned int K = _bit_scan_reverse (X); \\r
- I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\\r
- }\\r
-}\r
-\r
-#elif defined(_MSC_VER) && _MSC_VER>=1300\r
-#define compute_tree_index(S, I)\\r
-{\\r
- size_t X = S >> TREEBIN_SHIFT;\\r
- if (X == 0)\\r
- I = 0;\\r
- else if (X > 0xFFFF)\\r
- I = NTREEBINS-1;\\r
- else {\\r
- unsigned int K;\\r
- _BitScanReverse((DWORD *) &K, (DWORD) X);\\r
- I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\\r
- }\\r
-}\r
-\r
-#else /* GNUC */\r
-#define compute_tree_index(S, I)\\r
-{\\r
- size_t X = S >> TREEBIN_SHIFT;\\r
- if (X == 0)\\r
- I = 0;\\r
- else if (X > 0xFFFF)\\r
- I = NTREEBINS-1;\\r
- else {\\r
- unsigned int Y = (unsigned int)X;\\r
- unsigned int N = ((Y - 0x100) >> 16) & 8;\\r
- unsigned int K = (((Y <<= N) - 0x1000) >> 16) & 4;\\r
- N += K;\\r
- N += K = (((Y <<= K) - 0x4000) >> 16) & 2;\\r
- K = 14 - N + ((Y <<= K) >> 15);\\r
- I = (K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1));\\r
- }\\r
-}\r
-#endif /* GNUC */\r
-\r
-/* Bit representing maximum resolved size in a treebin at i */\r
-#define bit_for_tree_index(i) \\r
- (i == NTREEBINS-1)? (SIZE_T_BITSIZE-1) : (((i) >> 1) + TREEBIN_SHIFT - 2)\r
-\r
-/* Shift placing maximum resolved bit in a treebin at i as sign bit */\r
-#define leftshift_for_tree_index(i) \\r
- ((i == NTREEBINS-1)? 0 : \\r
- ((SIZE_T_BITSIZE-SIZE_T_ONE) - (((i) >> 1) + TREEBIN_SHIFT - 2)))\r
-\r
-/* The size of the smallest chunk held in bin with index i */\r
-#define minsize_for_tree_index(i) \\r
- ((SIZE_T_ONE << (((i) >> 1) + TREEBIN_SHIFT)) | \\r
- (((size_t)((i) & SIZE_T_ONE)) << (((i) >> 1) + TREEBIN_SHIFT - 1)))\r
-\r
-\r
-/* ------------------------ Operations on bin maps ----------------------- */\r
-\r
-/* bit corresponding to given index */\r
-#define idx2bit(i) ((binmap_t)(1) << (i))\r
-\r
-/* Mark/Clear bits with given index */\r
-#define mark_smallmap(M,i) ((M)->smallmap |= idx2bit(i))\r
-#define clear_smallmap(M,i) ((M)->smallmap &= ~idx2bit(i))\r
-#define smallmap_is_marked(M,i) ((M)->smallmap & idx2bit(i))\r
-\r
-#define mark_treemap(M,i) ((M)->treemap |= idx2bit(i))\r
-#define clear_treemap(M,i) ((M)->treemap &= ~idx2bit(i))\r
-#define treemap_is_marked(M,i) ((M)->treemap & idx2bit(i))\r
-\r
-/* isolate the least set bit of a bitmap */\r
-#define least_bit(x) ((x) & -(x))\r
-\r
-/* mask with all bits to left of least bit of x on */\r
-#define left_bits(x) ((x<<1) | -(x<<1))\r
-\r
-/* mask with all bits to left of or equal to least bit of x on */\r
-#define same_or_left_bits(x) ((x) | -(x))\r
-\r
-/* index corresponding to given bit. Use x86 asm if possible */\r
-\r
-#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))\r
-#define compute_bit2idx(X, I)\\r
-{\\r
- unsigned int J;\\r
- J = __builtin_ctz(X); \\r
- I = (bindex_t)J;\\r
-}\r
-\r
-#elif defined (__INTEL_COMPILER)\r
-#define compute_bit2idx(X, I)\\r
-{\\r
- unsigned int J;\\r
- J = _bit_scan_forward (X); \\r
- I = (bindex_t)J;\\r
-}\r
-\r
-#elif defined(_MSC_VER) && _MSC_VER>=1300\r
-#define compute_bit2idx(X, I)\\r
-{\\r
- unsigned int J;\\r
- _BitScanForward((DWORD *) &J, X);\\r
- I = (bindex_t)J;\\r
-}\r
-\r
-#elif USE_BUILTIN_FFS\r
-#define compute_bit2idx(X, I) I = ffs(X)-1\r
-\r
-#else\r
-#define compute_bit2idx(X, I)\\r
-{\\r
- unsigned int Y = X - 1;\\r
- unsigned int K = Y >> (16-4) & 16;\\r
- unsigned int N = K; Y >>= K;\\r
- N += K = Y >> (8-3) & 8; Y >>= K;\\r
- N += K = Y >> (4-2) & 4; Y >>= K;\\r
- N += K = Y >> (2-1) & 2; Y >>= K;\\r
- N += K = Y >> (1-0) & 1; Y >>= K;\\r
- I = (bindex_t)(N + Y);\\r
-}\r
-#endif /* GNUC */\r
-\r
-\r
-/* ----------------------- Runtime Check Support ------------------------- */\r
-\r
-/*\r
- For security, the main invariant is that malloc/free/etc never\r
- writes to a static address other than malloc_state, unless static\r
- malloc_state itself has been corrupted, which cannot occur via\r
- malloc (because of these checks). In essence this means that we\r
- believe all pointers, sizes, maps etc held in malloc_state, but\r
- check all of those linked or offsetted from other embedded data\r
- structures. These checks are interspersed with main code in a way\r
- that tends to minimize their run-time cost.\r
-\r
- When FOOTERS is defined, in addition to range checking, we also\r
- verify footer fields of inuse chunks, which can be used guarantee\r
- that the mstate controlling malloc/free is intact. This is a\r
- streamlined version of the approach described by William Robertson\r
- et al in "Run-time Detection of Heap-based Overflows" LISA'03\r
- http://www.usenix.org/events/lisa03/tech/robertson.html The footer\r
- of an inuse chunk holds the xor of its mstate and a random seed,\r
- that is checked upon calls to free() and realloc(). This is\r
- (probabalistically) unguessable from outside the program, but can be\r
- computed by any code successfully malloc'ing any chunk, so does not\r
- itself provide protection against code that has already broken\r
- security through some other means. Unlike Robertson et al, we\r
- always dynamically check addresses of all offset chunks (previous,\r
- next, etc). This turns out to be cheaper than relying on hashes.\r
-*/\r
-\r
-#if !INSECURE\r
-/* Check if address a is at least as high as any from MORECORE or MMAP */\r
-#define ok_address(M, a) ((char*)(a) >= (M)->least_addr)\r
-/* Check if address of next chunk n is higher than base chunk p */\r
-#define ok_next(p, n) ((char*)(p) < (char*)(n))\r
-/* Check if p has inuse status */\r
-#define ok_inuse(p) is_inuse(p)\r
-/* Check if p has its pinuse bit on */\r
-#define ok_pinuse(p) pinuse(p)\r
-\r
-#else /* !INSECURE */\r
-#define ok_address(M, a) (1)\r
-#define ok_next(b, n) (1)\r
-#define ok_inuse(p) (1)\r
-#define ok_pinuse(p) (1)\r
-#endif /* !INSECURE */\r
-\r
-#if (FOOTERS && !INSECURE)\r
-/* Check if (alleged) mstate m has expected magic field */\r
-#define ok_magic(M) ((M)->magic == mparams.magic)\r
-#else /* (FOOTERS && !INSECURE) */\r
-#define ok_magic(M) (1)\r
-#endif /* (FOOTERS && !INSECURE) */\r
-\r
-/* In gcc, use __builtin_expect to minimize impact of checks */\r
-#if !INSECURE\r
-#if defined(__GNUC__) && __GNUC__ >= 3\r
-#define RTCHECK(e) __builtin_expect(e, 1)\r
-#else /* GNUC */\r
-#define RTCHECK(e) (e)\r
-#endif /* GNUC */\r
-#else /* !INSECURE */\r
-#define RTCHECK(e) (1)\r
-#endif /* !INSECURE */\r
-\r
-/* macros to set up inuse chunks with or without footers */\r
-\r
-#if !FOOTERS\r
-\r
-#define mark_inuse_foot(M,p,s)\r
-\r
-/* Macros for setting head/foot of non-mmapped chunks */\r
-\r
-/* Set cinuse bit and pinuse bit of next chunk */\r
-#define set_inuse(M,p,s)\\r
- ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\\r
- ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT)\r
-\r
-/* Set cinuse and pinuse of this chunk and pinuse of next chunk */\r
-#define set_inuse_and_pinuse(M,p,s)\\r
- ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\\r
- ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT)\r
-\r
-/* Set size, cinuse and pinuse bit of this chunk */\r
-#define set_size_and_pinuse_of_inuse_chunk(M, p, s)\\r
- ((p)->head = (s|PINUSE_BIT|CINUSE_BIT))\r
-\r
-#else /* FOOTERS */\r
-\r
-/* Set foot of inuse chunk to be xor of mstate and seed */\r
-#define mark_inuse_foot(M,p,s)\\r
- (((mchunkptr)((char*)(p) + (s)))->prev_foot = ((size_t)(M) ^ mparams.magic))\r
-\r
-#define get_mstate_for(p)\\r
- ((mstate)(((mchunkptr)((char*)(p) +\\r
- (chunksize(p))))->prev_foot ^ mparams.magic))\r
-\r
-#define set_inuse(M,p,s)\\r
- ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\\r
- (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT), \\r
- mark_inuse_foot(M,p,s))\r
-\r
-#define set_inuse_and_pinuse(M,p,s)\\r
- ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\\r
- (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT),\\r
- mark_inuse_foot(M,p,s))\r
-\r
-#define set_size_and_pinuse_of_inuse_chunk(M, p, s)\\r
- ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\\r
- mark_inuse_foot(M, p, s))\r
-\r
-#endif /* !FOOTERS */\r
-\r
-/* ---------------------------- setting mparams -------------------------- */\r
-\r
-/* Initialize mparams */\r
-static int init_mparams(void) {\r
-#ifdef NEED_GLOBAL_LOCK_INIT\r
- call_once(&malloc_global_mutex_init_once, init_malloc_global_mutex);\r
-#endif\r
-\r
- ACQUIRE_MALLOC_GLOBAL_LOCK();\r
- if (mparams.magic == 0) {\r
- size_t magic;\r
- size_t psize;\r
- size_t gsize;\r
-\r
-#ifndef WIN32\r
- psize = malloc_getpagesize;\r
- gsize = ((DEFAULT_GRANULARITY != 0)? DEFAULT_GRANULARITY : psize);\r
-#else /* WIN32 */\r
- {\r
- SYSTEM_INFO system_info;\r
- GetSystemInfo(&system_info);\r
- psize = system_info.dwPageSize;\r
- gsize = ((DEFAULT_GRANULARITY != 0)?\r
- DEFAULT_GRANULARITY : system_info.dwAllocationGranularity);\r
- }\r
-#endif /* WIN32 */\r
-\r
- /* Sanity-check configuration:\r
- size_t must be unsigned and as wide as pointer type.\r
- ints must be at least 4 bytes.\r
- alignment must be at least 8.\r
- Alignment, min chunk size, and page size must all be powers of 2.\r
- */\r
- if ((sizeof(size_t) != sizeof(char*)) ||\r
- (MAX_SIZE_T < MIN_CHUNK_SIZE) ||\r
- (sizeof(int) < 4) ||\r
- (MALLOC_ALIGNMENT < (size_t)8U) ||\r
- ((MALLOC_ALIGNMENT & (MALLOC_ALIGNMENT-SIZE_T_ONE)) != 0) ||\r
- ((MCHUNK_SIZE & (MCHUNK_SIZE-SIZE_T_ONE)) != 0) ||\r
- ((gsize & (gsize-SIZE_T_ONE)) != 0) ||\r
- ((psize & (psize-SIZE_T_ONE)) != 0))\r
- ABORT;\r
-\r
- mparams.granularity = gsize;\r
- mparams.page_size = psize;\r
- mparams.mmap_threshold = DEFAULT_MMAP_THRESHOLD;\r
- mparams.trim_threshold = DEFAULT_TRIM_THRESHOLD;\r
-#if MORECORE_CONTIGUOUS\r
- mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT;\r
-#else /* MORECORE_CONTIGUOUS */\r
- mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT|USE_NONCONTIGUOUS_BIT;\r
-#endif /* MORECORE_CONTIGUOUS */\r
-\r
-#if !ONLY_MSPACES\r
- /* Set up lock for main malloc area */\r
- gm->mflags = mparams.default_mflags;\r
- (void)INITIAL_LOCK(&gm->mutex);\r
-#endif\r
-\r
- {\r
-#if USE_DEV_RANDOM\r
- int fd;\r
- unsigned char buf[sizeof(size_t)];\r
- /* Try to use /dev/urandom, else fall back on using time */\r
- if ((fd = open("/dev/urandom", O_RDONLY)) >= 0 &&\r
- read(fd, buf, sizeof(buf)) == sizeof(buf)) {\r
- magic = *((size_t *) buf);\r
- close(fd);\r
- }\r
- else\r
-#endif /* USE_DEV_RANDOM */\r
-#ifdef WIN32\r
- magic = (size_t)(GetTickCount() ^ (size_t)0x55555555U);\r
-#elif defined(LACKS_TIME_H)\r
- magic = (size_t)&magic ^ (size_t)0x55555555U;\r
-#else\r
- magic = (size_t)(time(0) ^ (size_t)0x55555555U);\r
-#endif\r
- magic |= (size_t)8U; /* ensure nonzero */\r
- magic &= ~(size_t)7U; /* improve chances of fault for bad values */\r
- /* Until memory modes commonly available, use volatile-write */\r
- (*(volatile size_t *)(&(mparams.magic))) = magic;\r
- }\r
- }\r
-\r
- RELEASE_MALLOC_GLOBAL_LOCK();\r
- return 1;\r
-}\r
-\r
-/* support for mallopt */\r
-static int change_mparam(int param_number, int value) {\r
- size_t val;\r
- ensure_initialization();\r
- val = (value == -1)? MAX_SIZE_T : (size_t)value;\r
- switch(param_number) {\r
- case M_TRIM_THRESHOLD:\r
- mparams.trim_threshold = val;\r
- return 1;\r
- case M_GRANULARITY:\r
- if (val >= mparams.page_size && ((val & (val-1)) == 0)) {\r
- mparams.granularity = val;\r
- return 1;\r
- }\r
- else\r
- return 0;\r
- case M_MMAP_THRESHOLD:\r
- mparams.mmap_threshold = val;\r
- return 1;\r
- default:\r
- return 0;\r
- }\r
-}\r
-\r
-#if DEBUG\r
-/* ------------------------- Debugging Support --------------------------- */\r
-\r
-/* Check properties of any chunk, whether free, inuse, mmapped etc */\r
-static void do_check_any_chunk(mstate m, mchunkptr p) {\r
- assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));\r
- assert(ok_address(m, p));\r
-}\r
-\r
-/* Check properties of top chunk */\r
-static void do_check_top_chunk(mstate m, mchunkptr p) {\r
- msegmentptr sp = segment_holding(m, (char*)p);\r
- size_t sz = p->head & ~INUSE_BITS; /* third-lowest bit can be set! */\r
- assert(sp != 0);\r
- assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));\r
- assert(ok_address(m, p));\r
- assert(sz == m->topsize);\r
- assert(sz > 0);\r
- assert(sz == ((sp->base + sp->size) - (char*)p) - TOP_FOOT_SIZE);\r
- assert(pinuse(p));\r
- assert(!pinuse(chunk_plus_offset(p, sz)));\r
-}\r
-\r
-/* Check properties of (inuse) mmapped chunks */\r
-static void do_check_mmapped_chunk(mstate m, mchunkptr p) {\r
- size_t sz = chunksize(p);\r
- size_t len = (sz + (p->prev_foot) + MMAP_FOOT_PAD);\r
- assert(is_mmapped(p));\r
- assert(use_mmap(m));\r
- assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));\r
- assert(ok_address(m, p));\r
- assert(!is_small(sz));\r
- assert((len & (mparams.page_size-SIZE_T_ONE)) == 0);\r
- assert(chunk_plus_offset(p, sz)->head == FENCEPOST_HEAD);\r
- assert(chunk_plus_offset(p, sz+SIZE_T_SIZE)->head == 0);\r
-}\r
-\r
-/* Check properties of inuse chunks */\r
-static void do_check_inuse_chunk(mstate m, mchunkptr p) {\r
- do_check_any_chunk(m, p);\r
- assert(is_inuse(p));\r
- assert(next_pinuse(p));\r
- /* If not pinuse and not mmapped, previous chunk has OK offset */\r
- assert(is_mmapped(p) || pinuse(p) || next_chunk(prev_chunk(p)) == p);\r
- if (is_mmapped(p))\r
- do_check_mmapped_chunk(m, p);\r
-}\r
-\r
-/* Check properties of free chunks */\r
-static void do_check_free_chunk(mstate m, mchunkptr p) {\r
- size_t sz = chunksize(p);\r
- mchunkptr next = chunk_plus_offset(p, sz);\r
- do_check_any_chunk(m, p);\r
- assert(!is_inuse(p));\r
- assert(!next_pinuse(p));\r
- assert (!is_mmapped(p));\r
- if (p != m->dv && p != m->top) {\r
- if (sz >= MIN_CHUNK_SIZE) {\r
- assert((sz & CHUNK_ALIGN_MASK) == 0);\r
- assert(is_aligned(chunk2mem(p)));\r
- assert(next->prev_foot == sz);\r
- assert(pinuse(p));\r
- assert (next == m->top || is_inuse(next));\r
- assert(p->fd->bk == p);\r
- assert(p->bk->fd == p);\r
- }\r
- else /* markers are always of size SIZE_T_SIZE */\r
- assert(sz == SIZE_T_SIZE);\r
- }\r
-}\r
-\r
-/* Check properties of malloced chunks at the point they are malloced */\r
-static void do_check_malloced_chunk(mstate m, void* mem, size_t s) {\r
- if (mem != 0) {\r
- mchunkptr p = mem2chunk(mem);\r
- size_t sz = p->head & ~INUSE_BITS;\r
- do_check_inuse_chunk(m, p);\r
- assert((sz & CHUNK_ALIGN_MASK) == 0);\r
- assert(sz >= MIN_CHUNK_SIZE);\r
- assert(sz >= s);\r
- /* unless mmapped, size is less than MIN_CHUNK_SIZE more than request */\r
- assert(is_mmapped(p) || sz < (s + MIN_CHUNK_SIZE));\r
- }\r
-}\r
-\r
-/* Check a tree and its subtrees. */\r
-static void do_check_tree(mstate m, tchunkptr t) {\r
- tchunkptr head = 0;\r
- tchunkptr u = t;\r
- bindex_t tindex = t->index;\r
- size_t tsize = chunksize(t);\r
- bindex_t idx;\r
- compute_tree_index(tsize, idx);\r
- assert(tindex == idx);\r
- assert(tsize >= MIN_LARGE_SIZE);\r
- assert(tsize >= minsize_for_tree_index(idx));\r
- assert((idx == NTREEBINS-1) || (tsize < minsize_for_tree_index((idx+1))));\r
-\r
- do { /* traverse through chain of same-sized nodes */\r
- do_check_any_chunk(m, ((mchunkptr)u));\r
- assert(u->index == tindex);\r
- assert(chunksize(u) == tsize);\r
- assert(!is_inuse(u));\r
- assert(!next_pinuse(u));\r
- assert(u->fd->bk == u);\r
- assert(u->bk->fd == u);\r
- if (u->parent == 0) {\r
- assert(u->child[0] == 0);\r
- assert(u->child[1] == 0);\r
- }\r
- else {\r
- assert(head == 0); /* only one node on chain has parent */\r
- head = u;\r
- assert(u->parent != u);\r
- assert (u->parent->child[0] == u ||\r
- u->parent->child[1] == u ||\r
- *((tbinptr*)(u->parent)) == u);\r
- if (u->child[0] != 0) {\r
- assert(u->child[0]->parent == u);\r
- assert(u->child[0] != u);\r
- do_check_tree(m, u->child[0]);\r
- }\r
- if (u->child[1] != 0) {\r
- assert(u->child[1]->parent == u);\r
- assert(u->child[1] != u);\r
- do_check_tree(m, u->child[1]);\r
- }\r
- if (u->child[0] != 0 && u->child[1] != 0) {\r
- assert(chunksize(u->child[0]) < chunksize(u->child[1]));\r
- }\r
- }\r
- u = u->fd;\r
- } while (u != t);\r
- assert(head != 0);\r
-}\r
-\r
-/* Check all the chunks in a treebin. */\r
-static void do_check_treebin(mstate m, bindex_t i) {\r
- tbinptr* tb = treebin_at(m, i);\r
- tchunkptr t = *tb;\r
- int empty = (m->treemap & (1U << i)) == 0;\r
- if (t == 0)\r
- assert(empty);\r
- if (!empty)\r
- do_check_tree(m, t);\r
-}\r
-\r
-/* Check all the chunks in a smallbin. */\r
-static void do_check_smallbin(mstate m, bindex_t i) {\r
- sbinptr b = smallbin_at(m, i);\r
- mchunkptr p = b->bk;\r
- unsigned int empty = (m->smallmap & (1U << i)) == 0;\r
- if (p == b)\r
- assert(empty);\r
- if (!empty) {\r
- for (; p != b; p = p->bk) {\r
- size_t size = chunksize(p);\r
- mchunkptr q;\r
- /* each chunk claims to be free */\r
- do_check_free_chunk(m, p);\r
- /* chunk belongs in bin */\r
- assert(small_index(size) == i);\r
- assert(p->bk == b || chunksize(p->bk) == chunksize(p));\r
- /* chunk is followed by an inuse chunk */\r
- q = next_chunk(p);\r
- if (q->head != FENCEPOST_HEAD)\r
- do_check_inuse_chunk(m, q);\r
- }\r
- }\r
-}\r
-\r
-/* Find x in a bin. Used in other check functions. */\r
-static int bin_find(mstate m, mchunkptr x) {\r
- size_t size = chunksize(x);\r
- if (is_small(size)) {\r
- bindex_t sidx = small_index(size);\r
- sbinptr b = smallbin_at(m, sidx);\r
- if (smallmap_is_marked(m, sidx)) {\r
- mchunkptr p = b;\r
- do {\r
- if (p == x)\r
- return 1;\r
- } while ((p = p->fd) != b);\r
- }\r
- }\r
- else {\r
- bindex_t tidx;\r
- compute_tree_index(size, tidx);\r
- if (treemap_is_marked(m, tidx)) {\r
- tchunkptr t = *treebin_at(m, tidx);\r
- size_t sizebits = size << leftshift_for_tree_index(tidx);\r
- while (t != 0 && chunksize(t) != size) {\r
- t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1];\r
- sizebits <<= 1;\r
- }\r
- if (t != 0) {\r
- tchunkptr u = t;\r
- do {\r
- if (u == (tchunkptr)x)\r
- return 1;\r
- } while ((u = u->fd) != t);\r
- }\r
- }\r
- }\r
- return 0;\r
-}\r
-\r
-/* Traverse each chunk and check it; return total */\r
-static size_t traverse_and_check(mstate m) {\r
- size_t sum = 0;\r
- if (is_initialized(m)) {\r
- msegmentptr s = &m->seg;\r
- sum += m->topsize + TOP_FOOT_SIZE;\r
- while (s != 0) {\r
- mchunkptr q = align_as_chunk(s->base);\r
- mchunkptr lastq = 0;\r
- assert(pinuse(q));\r
- while (segment_holds(s, q) &&\r
- q != m->top && q->head != FENCEPOST_HEAD) {\r
- sum += chunksize(q);\r
- if (is_inuse(q)) {\r
- assert(!bin_find(m, q));\r
- do_check_inuse_chunk(m, q);\r
- }\r
- else {\r
- assert(q == m->dv || bin_find(m, q));\r
- assert(lastq == 0 || is_inuse(lastq)); /* Not 2 consecutive free */\r
- do_check_free_chunk(m, q);\r
- }\r
- lastq = q;\r
- q = next_chunk(q);\r
- }\r
- s = s->next;\r
- }\r
- }\r
- return sum;\r
-}\r
-\r
-\r
-/* Check all properties of malloc_state. */\r
-static void do_check_malloc_state(mstate m) {\r
- bindex_t i;\r
- size_t total;\r
- /* check bins */\r
- for (i = 0; i < NSMALLBINS; ++i)\r
- do_check_smallbin(m, i);\r
- for (i = 0; i < NTREEBINS; ++i)\r
- do_check_treebin(m, i);\r
-\r
- if (m->dvsize != 0) { /* check dv chunk */\r
- do_check_any_chunk(m, m->dv);\r
- assert(m->dvsize == chunksize(m->dv));\r
- assert(m->dvsize >= MIN_CHUNK_SIZE);\r
- assert(bin_find(m, m->dv) == 0);\r
- }\r
-\r
- if (m->top != 0) { /* check top chunk */\r
- do_check_top_chunk(m, m->top);\r
- /*assert(m->topsize == chunksize(m->top)); redundant */\r
- assert(m->topsize > 0);\r
- assert(bin_find(m, m->top) == 0);\r
- }\r
-\r
- total = traverse_and_check(m);\r
- assert(total <= m->footprint);\r
- assert(m->footprint <= m->max_footprint);\r
-}\r
-#endif /* DEBUG */\r
-\r
-/* ----------------------------- statistics ------------------------------ */\r
-\r
-#if !NO_MALLINFO\r
-static struct mallinfo internal_mallinfo(mstate m) {\r
- struct mallinfo nm = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };\r
- ensure_initialization();\r
- if (!PREACTION(m)) {\r
- check_malloc_state(m);\r
- if (is_initialized(m)) {\r
- size_t nfree = SIZE_T_ONE; /* top always free */\r
- size_t mfree = m->topsize + TOP_FOOT_SIZE;\r
- size_t sum = mfree;\r
- msegmentptr s = &m->seg;\r
- while (s != 0) {\r
- mchunkptr q = align_as_chunk(s->base);\r
- while (segment_holds(s, q) &&\r
- q != m->top && q->head != FENCEPOST_HEAD) {\r
- size_t sz = chunksize(q);\r
- sum += sz;\r
- if (!is_inuse(q)) {\r
- mfree += sz;\r
- ++nfree;\r
- }\r
- q = next_chunk(q);\r
- }\r
- s = s->next;\r
- }\r
-\r
- nm.arena = sum;\r
- nm.ordblks = nfree;\r
- nm.hblkhd = m->footprint - sum;\r
- nm.usmblks = m->max_footprint;\r
- nm.uordblks = m->footprint - mfree;\r
- nm.fordblks = mfree;\r
- nm.keepcost = m->topsize;\r
- }\r
-\r
- POSTACTION(m);\r
- }\r
- return nm;\r
-}\r
-#endif /* !NO_MALLINFO */\r
-\r
-#if !NO_MALLOC_STATS\r
-static void internal_malloc_stats(mstate m) {\r
- ensure_initialization();\r
- if (!PREACTION(m)) {\r
- size_t maxfp = 0;\r
- size_t fp = 0;\r
- size_t used = 0;\r
- check_malloc_state(m);\r
- if (is_initialized(m)) {\r
- msegmentptr s = &m->seg;\r
- maxfp = m->max_footprint;\r
- fp = m->footprint;\r
- used = fp - (m->topsize + TOP_FOOT_SIZE);\r
-\r
- while (s != 0) {\r
- mchunkptr q = align_as_chunk(s->base);\r
- while (segment_holds(s, q) &&\r
- q != m->top && q->head != FENCEPOST_HEAD) {\r
- if (!is_inuse(q))\r
- used -= chunksize(q);\r
- q = next_chunk(q);\r
- }\r
- s = s->next;\r
- }\r
- }\r
- POSTACTION(m); /* drop lock */\r
- fprintf(stderr, "max system bytes = %10lu\n", (unsigned long)(maxfp));\r
- fprintf(stderr, "system bytes = %10lu\n", (unsigned long)(fp));\r
- fprintf(stderr, "in use bytes = %10lu\n", (unsigned long)(used));\r
- }\r
-}\r
-#endif /* NO_MALLOC_STATS */\r
-\r
-/* ----------------------- Operations on smallbins ----------------------- */\r
-\r
-/*\r
- Various forms of linking and unlinking are defined as macros. Even\r
- the ones for trees, which are very long but have very short typical\r
- paths. This is ugly but reduces reliance on inlining support of\r
- compilers.\r
-*/\r
-\r
-/* Link a free chunk into a smallbin */\r
-#define insert_small_chunk(M, P, S) {\\r
- bindex_t I = small_index(S);\\r
- mchunkptr B = smallbin_at(M, I);\\r
- mchunkptr F = B;\\r
- assert(S >= MIN_CHUNK_SIZE);\\r
- if (!smallmap_is_marked(M, I))\\r
- mark_smallmap(M, I);\\r
- else if (RTCHECK(ok_address(M, B->fd)))\\r
- F = B->fd;\\r
- else {\\r
- CORRUPTION_ERROR_ACTION(M);\\r
- }\\r
- B->fd = P;\\r
- F->bk = P;\\r
- P->fd = F;\\r
- P->bk = B;\\r
-}\r
-\r
-/* Unlink a chunk from a smallbin */\r
-#define unlink_small_chunk(M, P, S) {\\r
- mchunkptr F = P->fd;\\r
- mchunkptr B = P->bk;\\r
- bindex_t I = small_index(S);\\r
- assert(P != B);\\r
- assert(P != F);\\r
- assert(chunksize(P) == small_index2size(I));\\r
- if (RTCHECK(F == smallbin_at(M,I) || (ok_address(M, F) && F->bk == P))) { \\r
- if (B == F) {\\r
- clear_smallmap(M, I);\\r
- }\\r
- else if (RTCHECK(B == smallbin_at(M,I) ||\\r
- (ok_address(M, B) && B->fd == P))) {\\r
- F->bk = B;\\r
- B->fd = F;\\r
- }\\r
- else {\\r
- CORRUPTION_ERROR_ACTION(M);\\r
- }\\r
- }\\r
- else {\\r
- CORRUPTION_ERROR_ACTION(M);\\r
- }\\r
-}\r
-\r
-/* Unlink the first chunk from a smallbin */\r
-#define unlink_first_small_chunk(M, B, P, I) {\\r
- mchunkptr F = P->fd;\\r
- assert(P != B);\\r
- assert(P != F);\\r
- assert(chunksize(P) == small_index2size(I));\\r
- if (B == F) {\\r
- clear_smallmap(M, I);\\r
- }\\r
- else if (RTCHECK(ok_address(M, F) && F->bk == P)) {\\r
- F->bk = B;\\r
- B->fd = F;\\r
- }\\r
- else {\\r
- CORRUPTION_ERROR_ACTION(M);\\r
- }\\r
-}\r
-\r
-/* Replace dv node, binning the old one */\r
-/* Used only when dvsize known to be small */\r
-#define replace_dv(M, P, S) {\\r
- size_t DVS = M->dvsize;\\r
- assert(is_small(DVS));\\r
- if (DVS != 0) {\\r
- mchunkptr DV = M->dv;\\r
- insert_small_chunk(M, DV, DVS);\\r
- }\\r
- M->dvsize = S;\\r
- M->dv = P;\\r
-}\r
-\r
-/* ------------------------- Operations on trees ------------------------- */\r
-\r
-/* Insert chunk into tree */\r
-#define insert_large_chunk(M, X, S) {\\r
- tbinptr* H;\\r
- bindex_t I;\\r
- compute_tree_index(S, I);\\r
- H = treebin_at(M, I);\\r
- X->index = I;\\r
- X->child[0] = X->child[1] = 0;\\r
- if (!treemap_is_marked(M, I)) {\\r
- mark_treemap(M, I);\\r
- *H = X;\\r
- X->parent = (tchunkptr)H;\\r
- X->fd = X->bk = X;\\r
- }\\r
- else {\\r
- tchunkptr T = *H;\\r
- size_t K = S << leftshift_for_tree_index(I);\\r
- for (;;) {\\r
- if (chunksize(T) != S) {\\r
- tchunkptr* C = &(T->child[(K >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1]);\\r
- K <<= 1;\\r
- if (*C != 0)\\r
- T = *C;\\r
- else if (RTCHECK(ok_address(M, C))) {\\r
- *C = X;\\r
- X->parent = T;\\r
- X->fd = X->bk = X;\\r
- break;\\r
- }\\r
- else {\\r
- CORRUPTION_ERROR_ACTION(M);\\r
- break;\\r
- }\\r
- }\\r
- else {\\r
- tchunkptr F = T->fd;\\r
- if (RTCHECK(ok_address(M, T) && ok_address(M, F))) {\\r
- T->fd = F->bk = X;\\r
- X->fd = F;\\r
- X->bk = T;\\r
- X->parent = 0;\\r
- break;\\r
- }\\r
- else {\\r
- CORRUPTION_ERROR_ACTION(M);\\r
- break;\\r
- }\\r
- }\\r
- }\\r
- }\\r
-}\r
-\r
-/*\r
- Unlink steps:\r
-\r
- 1. If x is a chained node, unlink it from its same-sized fd/bk links\r
- and choose its bk node as its replacement.\r
- 2. If x was the last node of its size, but not a leaf node, it must\r
- be replaced with a leaf node (not merely one with an open left or\r
- right), to make sure that lefts and rights of descendents\r
- correspond properly to bit masks. We use the rightmost descendent\r
- of x. We could use any other leaf, but this is easy to locate and\r
- tends to counteract removal of leftmosts elsewhere, and so keeps\r
- paths shorter than minimally guaranteed. This doesn't loop much\r
- because on average a node in a tree is near the bottom.\r
- 3. If x is the base of a chain (i.e., has parent links) relink\r
- x's parent and children to x's replacement (or null if none).\r
-*/\r
-\r
-#define unlink_large_chunk(M, X) {\\r
- tchunkptr XP = X->parent;\\r
- tchunkptr R;\\r
- if (X->bk != X) {\\r
- tchunkptr F = X->fd;\\r
- R = X->bk;\\r
- if (RTCHECK(ok_address(M, F) && F->bk == X && R->fd == X)) {\\r
- F->bk = R;\\r
- R->fd = F;\\r
- }\\r
- else {\\r
- CORRUPTION_ERROR_ACTION(M);\\r
- }\\r
- }\\r
- else {\\r
- tchunkptr* RP;\\r
- if (((R = *(RP = &(X->child[1]))) != 0) ||\\r
- ((R = *(RP = &(X->child[0]))) != 0)) {\\r
- tchunkptr* CP;\\r
- while ((*(CP = &(R->child[1])) != 0) ||\\r
- (*(CP = &(R->child[0])) != 0)) {\\r
- R = *(RP = CP);\\r
- }\\r
- if (RTCHECK(ok_address(M, RP)))\\r
- *RP = 0;\\r
- else {\\r
- CORRUPTION_ERROR_ACTION(M);\\r
- }\\r
- }\\r
- }\\r
- if (XP != 0) {\\r
- tbinptr* H = treebin_at(M, X->index);\\r
- if (X == *H) {\\r
- if ((*H = R) == 0) \\r
- clear_treemap(M, X->index);\\r
- }\\r
- else if (RTCHECK(ok_address(M, XP))) {\\r
- if (XP->child[0] == X) \\r
- XP->child[0] = R;\\r
- else \\r
- XP->child[1] = R;\\r
- }\\r
- else\\r
- CORRUPTION_ERROR_ACTION(M);\\r
- if (R != 0) {\\r
- if (RTCHECK(ok_address(M, R))) {\\r
- tchunkptr C0, C1;\\r
- R->parent = XP;\\r
- if ((C0 = X->child[0]) != 0) {\\r
- if (RTCHECK(ok_address(M, C0))) {\\r
- R->child[0] = C0;\\r
- C0->parent = R;\\r
- }\\r
- else\\r
- CORRUPTION_ERROR_ACTION(M);\\r
- }\\r
- if ((C1 = X->child[1]) != 0) {\\r
- if (RTCHECK(ok_address(M, C1))) {\\r
- R->child[1] = C1;\\r
- C1->parent = R;\\r
- }\\r
- else\\r
- CORRUPTION_ERROR_ACTION(M);\\r
- }\\r
- }\\r
- else\\r
- CORRUPTION_ERROR_ACTION(M);\\r
- }\\r
- }\\r
-}\r
-\r
-/* Relays to large vs small bin operations */\r
-\r
-#define insert_chunk(M, P, S)\\r
- if (is_small(S)) insert_small_chunk(M, P, S)\\r
- else { tchunkptr TP = (tchunkptr)(P); insert_large_chunk(M, TP, S); }\r
-\r
-#define unlink_chunk(M, P, S)\\r
- if (is_small(S)) unlink_small_chunk(M, P, S)\\r
- else { tchunkptr TP = (tchunkptr)(P); unlink_large_chunk(M, TP); }\r
-\r
-\r
-/* Relays to internal calls to malloc/free from realloc, memalign etc */\r
-\r
-#if ONLY_MSPACES\r
-#define internal_malloc(m, b) mspace_malloc(m, b)\r
-#define internal_free(m, mem) mspace_free(m,mem);\r
-#else /* ONLY_MSPACES */\r
-#if MSPACES\r
-#define internal_malloc(m, b)\\r
- ((m == gm)? dlmalloc(b) : mspace_malloc(m, b))\r
-#define internal_free(m, mem)\\r
- if (m == gm) dlfree(mem); else mspace_free(m,mem);\r
-#else /* MSPACES */\r
-#define internal_malloc(m, b) dlmalloc(b)\r
-#define internal_free(m, mem) dlfree(mem)\r
-#endif /* MSPACES */\r
-#endif /* ONLY_MSPACES */\r
-\r
-/* ----------------------- Direct-mmapping chunks ----------------------- */\r
-\r
-/*\r
- Directly mmapped chunks are set up with an offset to the start of\r
- the mmapped region stored in the prev_foot field of the chunk. This\r
- allows reconstruction of the required argument to MUNMAP when freed,\r
- and also allows adjustment of the returned chunk to meet alignment\r
- requirements (especially in memalign).\r
-*/\r
-\r
-/* Malloc using mmap */\r
-static void* mmap_alloc(mstate m, size_t nb) {\r
- size_t mmsize = mmap_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK);\r
- if (m->footprint_limit != 0) {\r
- size_t fp = m->footprint + mmsize;\r
- if (fp <= m->footprint || fp > m->footprint_limit)\r
- return 0;\r
- }\r
- if (mmsize > nb) { /* Check for wrap around 0 */\r
- char* mm = (char*)(CALL_DIRECT_MMAP(mmsize));\r
- if (mm != CMFAIL) {\r
- size_t offset = align_offset(chunk2mem(mm));\r
- size_t psize = mmsize - offset - MMAP_FOOT_PAD;\r
- mchunkptr p = (mchunkptr)(mm + offset);\r
- p->prev_foot = offset;\r
- p->head = psize;\r
- mark_inuse_foot(m, p, psize);\r
- chunk_plus_offset(p, psize)->head = FENCEPOST_HEAD;\r
- chunk_plus_offset(p, psize+SIZE_T_SIZE)->head = 0;\r
-\r
- if (m->least_addr == 0 || mm < m->least_addr)\r
- m->least_addr = mm;\r
- if ((m->footprint += mmsize) > m->max_footprint)\r
- m->max_footprint = m->footprint;\r
- assert(is_aligned(chunk2mem(p)));\r
- check_mmapped_chunk(m, p);\r
- return chunk2mem(p);\r
- }\r
- }\r
- return 0;\r
-}\r
-\r
-/* Realloc using mmap */\r
-static mchunkptr mmap_resize(mstate m, mchunkptr oldp, size_t nb, int flags) {\r
- size_t oldsize = chunksize(oldp);\r
- (void) flags;\r
- if (is_small(nb)) /* Can't shrink mmap regions below small size */\r
- return 0;\r
- /* Keep old chunk if big enough but not too big */\r
- if (oldsize >= nb + SIZE_T_SIZE &&\r
- (oldsize - nb) <= (mparams.granularity << 1))\r
- return oldp;\r
- else {\r
- size_t offset = oldp->prev_foot;\r
- size_t oldmmsize = oldsize + offset + MMAP_FOOT_PAD;\r
- size_t newmmsize = mmap_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK);\r
- char* cp = (char*)CALL_MREMAP((char*)oldp - offset,\r
- oldmmsize, newmmsize, flags);\r
- if (cp != CMFAIL) {\r
- mchunkptr newp = (mchunkptr)(cp + offset);\r
- size_t psize = newmmsize - offset - MMAP_FOOT_PAD;\r
- newp->head = psize;\r
- mark_inuse_foot(m, newp, psize);\r
- chunk_plus_offset(newp, psize)->head = FENCEPOST_HEAD;\r
- chunk_plus_offset(newp, psize+SIZE_T_SIZE)->head = 0;\r
-\r
- if (cp < m->least_addr)\r
- m->least_addr = cp;\r
- if ((m->footprint += newmmsize - oldmmsize) > m->max_footprint)\r
- m->max_footprint = m->footprint;\r
- check_mmapped_chunk(m, newp);\r
- return newp;\r
- }\r
- }\r
- return 0;\r
-}\r
-\r
-\r
-/* -------------------------- mspace management -------------------------- */\r
-\r
-/* Initialize top chunk and its size */\r
-static void init_top(mstate m, mchunkptr p, size_t psize) {\r
- /* Ensure alignment */\r
- size_t offset = align_offset(chunk2mem(p));\r
- p = (mchunkptr)((char*)p + offset);\r
- psize -= offset;\r
-\r
- m->top = p;\r
- m->topsize = psize;\r
- p->head = psize | PINUSE_BIT;\r
- /* set size of fake trailing chunk holding overhead space only once */\r
- chunk_plus_offset(p, psize)->head = TOP_FOOT_SIZE;\r
- m->trim_check = mparams.trim_threshold; /* reset on each update */\r
-}\r
-\r
-/* Initialize bins for a new mstate that is otherwise zeroed out */\r
-static void init_bins(mstate m) {\r
- /* Establish circular links for smallbins */\r
- bindex_t i;\r
- for (i = 0; i < NSMALLBINS; ++i) {\r
- sbinptr bin = smallbin_at(m,i);\r
- bin->fd = bin->bk = bin;\r
- }\r
-}\r
-\r
-#if PROCEED_ON_ERROR\r
-\r
-/* default corruption action */\r
-static void reset_on_error(mstate m) {\r
- int i;\r
- ++malloc_corruption_error_count;\r
- /* Reinitialize fields to forget about all memory */\r
- m->smallmap = m->treemap = 0;\r
- m->dvsize = m->topsize = 0;\r
- m->seg.base = 0;\r
- m->seg.size = 0;\r
- m->seg.next = 0;\r
- m->top = m->dv = 0;\r
- for (i = 0; i < NTREEBINS; ++i)\r
- *treebin_at(m, i) = 0;\r
- init_bins(m);\r
-}\r
-#endif /* PROCEED_ON_ERROR */\r
-\r
-/* Allocate chunk and prepend remainder with chunk in successor base. */\r
-static void* prepend_alloc(mstate m, char* newbase, char* oldbase,\r
- size_t nb) {\r
- mchunkptr p = align_as_chunk(newbase);\r
- mchunkptr oldfirst = align_as_chunk(oldbase);\r
- size_t psize = (char*)oldfirst - (char*)p;\r
- mchunkptr q = chunk_plus_offset(p, nb);\r
- size_t qsize = psize - nb;\r
- set_size_and_pinuse_of_inuse_chunk(m, p, nb);\r
-\r
- assert((char*)oldfirst > (char*)q);\r
- assert(pinuse(oldfirst));\r
- assert(qsize >= MIN_CHUNK_SIZE);\r
-\r
- /* consolidate remainder with first chunk of old base */\r
- if (oldfirst == m->top) {\r
- size_t tsize = m->topsize += qsize;\r
- m->top = q;\r
- q->head = tsize | PINUSE_BIT;\r
- check_top_chunk(m, q);\r
- }\r
- else if (oldfirst == m->dv) {\r
- size_t dsize = m->dvsize += qsize;\r
- m->dv = q;\r
- set_size_and_pinuse_of_free_chunk(q, dsize);\r
- }\r
- else {\r
- if (!is_inuse(oldfirst)) {\r
- size_t nsize = chunksize(oldfirst);\r
- unlink_chunk(m, oldfirst, nsize);\r
- oldfirst = chunk_plus_offset(oldfirst, nsize);\r
- qsize += nsize;\r
- }\r
- set_free_with_pinuse(q, qsize, oldfirst);\r
- insert_chunk(m, q, qsize);\r
- check_free_chunk(m, q);\r
- }\r
-\r
- check_malloced_chunk(m, chunk2mem(p), nb);\r
- return chunk2mem(p);\r
-}\r
-\r
-/* Add a segment to hold a new noncontiguous region */\r
-static void add_segment(mstate m, char* tbase, size_t tsize, flag_t mmapped) {\r
- /* Determine locations and sizes of segment, fenceposts, old top */\r
- char* old_top = (char*)m->top;\r
- msegmentptr oldsp = segment_holding(m, old_top);\r
- char* old_end = oldsp->base + oldsp->size;\r
- size_t ssize = pad_request(sizeof(struct malloc_segment));\r
- char* rawsp = old_end - (ssize + FOUR_SIZE_T_SIZES + CHUNK_ALIGN_MASK);\r
- size_t offset = align_offset(chunk2mem(rawsp));\r
- char* asp = rawsp + offset;\r
- char* csp = (asp < (old_top + MIN_CHUNK_SIZE))? old_top : asp;\r
- mchunkptr sp = (mchunkptr)csp;\r
- msegmentptr ss = (msegmentptr)(chunk2mem(sp));\r
- mchunkptr tnext = chunk_plus_offset(sp, ssize);\r
- mchunkptr p = tnext;\r
- int nfences = 0;\r
-\r
- /* reset top to new space */\r
- init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE);\r
-\r
- /* Set up segment record */\r
- assert(is_aligned(ss));\r
- set_size_and_pinuse_of_inuse_chunk(m, sp, ssize);\r
- *ss = m->seg; /* Push current record */\r
- m->seg.base = tbase;\r
- m->seg.size = tsize;\r
- m->seg.sflags = mmapped;\r
- m->seg.next = ss;\r
-\r
- /* Insert trailing fenceposts */\r
- for (;;) {\r
- mchunkptr nextp = chunk_plus_offset(p, SIZE_T_SIZE);\r
- p->head = FENCEPOST_HEAD;\r
- ++nfences;\r
- if ((char*)(&(nextp->head)) < old_end)\r
- p = nextp;\r
- else\r
- break;\r
- }\r
- assert(nfences >= 2);\r
-\r
- /* Insert the rest of old top into a bin as an ordinary free chunk */\r
- if (csp != old_top) {\r
- mchunkptr q = (mchunkptr)old_top;\r
- size_t psize = csp - old_top;\r
- mchunkptr tn = chunk_plus_offset(q, psize);\r
- set_free_with_pinuse(q, psize, tn);\r
- insert_chunk(m, q, psize);\r
- }\r
-\r
- check_top_chunk(m, m->top);\r
-}\r
-\r
-/* -------------------------- System allocation -------------------------- */\r
-\r
-/* Get memory from system using MORECORE or MMAP */\r
-static void* sys_alloc(mstate m, size_t nb) {\r
- char* tbase = CMFAIL;\r
- size_t tsize = 0;\r
- flag_t mmap_flag = 0;\r
- size_t asize; /* allocation size */\r
-\r
- ensure_initialization();\r
-\r
- /* Directly map large chunks, but only if already initialized */\r
- if (use_mmap(m) && nb >= mparams.mmap_threshold && m->topsize != 0) {\r
- void* mem = mmap_alloc(m, nb);\r
- if (mem != 0)\r
- return mem;\r
- }\r
-\r
- asize = granularity_align(nb + SYS_ALLOC_PADDING);\r
- if (asize <= nb)\r
- return 0; /* wraparound */\r
- if (m->footprint_limit != 0) {\r
- size_t fp = m->footprint + asize;\r
- if (fp <= m->footprint || fp > m->footprint_limit)\r
- return 0;\r
- }\r
-\r
- /*\r
- Try getting memory in any of three ways (in most-preferred to\r
- least-preferred order):\r
- 1. A call to MORECORE that can normally contiguously extend memory.\r
- (disabled if not MORECORE_CONTIGUOUS or not HAVE_MORECORE or\r
- or main space is mmapped or a previous contiguous call failed)\r
- 2. A call to MMAP new space (disabled if not HAVE_MMAP).\r
- Note that under the default settings, if MORECORE is unable to\r
- fulfill a request, and HAVE_MMAP is true, then mmap is\r
- used as a noncontiguous system allocator. This is a useful backup\r
- strategy for systems with holes in address spaces -- in this case\r
- sbrk cannot contiguously expand the heap, but mmap may be able to\r
- find space.\r
- 3. A call to MORECORE that cannot usually contiguously extend memory.\r
- (disabled if not HAVE_MORECORE)\r
-\r
- In all cases, we need to request enough bytes from system to ensure\r
- we can malloc nb bytes upon success, so pad with enough space for\r
- top_foot, plus alignment-pad to make sure we don't lose bytes if\r
- not on boundary, and round this up to a granularity unit.\r
- */\r
-\r
- if (MORECORE_CONTIGUOUS && !use_noncontiguous(m)) {\r
- char* br = CMFAIL;\r
- msegmentptr ss = (m->top == 0)? 0 : segment_holding(m, (char*)m->top);\r
- ACQUIRE_MALLOC_GLOBAL_LOCK();\r
-\r
- if (ss == 0) { /* First time through or recovery */\r
- char* base = (char*)CALL_MORECORE(0);\r
- if (base != CMFAIL) {\r
- size_t fp;\r
- /* Adjust to end on a page boundary */\r
- if (!is_page_aligned(base))\r
- asize += (page_align((size_t)base) - (size_t)base);\r
- fp = m->footprint + asize; /* recheck limits */\r
- if (asize > nb && asize < HALF_MAX_SIZE_T &&\r
- (m->footprint_limit == 0 ||\r
- (fp > m->footprint && fp <= m->footprint_limit)) &&\r
- (br = (char*)(CALL_MORECORE(asize))) == base) {\r
- tbase = base;\r
- tsize = asize;\r
- }\r
- }\r
- }\r
- else {\r
- /* Subtract out existing available top space from MORECORE request. */\r
- asize = granularity_align(nb - m->topsize + SYS_ALLOC_PADDING);\r
- /* Use mem here only if it did continuously extend old space */\r
- if (asize < HALF_MAX_SIZE_T &&\r
- (br = (char*)(CALL_MORECORE(asize))) == ss->base+ss->size) {\r
- tbase = br;\r
- tsize = asize;\r
- }\r
- }\r
-\r
- if (tbase == CMFAIL) { /* Cope with partial failure */\r
- if (br != CMFAIL) { /* Try to use/extend the space we did get */\r
- if (asize < HALF_MAX_SIZE_T &&\r
- asize < nb + SYS_ALLOC_PADDING) {\r
- size_t esize = granularity_align(nb + SYS_ALLOC_PADDING - asize);\r
- if (esize < HALF_MAX_SIZE_T) {\r
- char* end = (char*)CALL_MORECORE(esize);\r
- if (end != CMFAIL)\r
- asize += esize;\r
- else { /* Can't use; try to release */\r
- (void) CALL_MORECORE(-asize);\r
- br = CMFAIL;\r
- }\r
- }\r
- }\r
- }\r
- if (br != CMFAIL) { /* Use the space we did get */\r
- tbase = br;\r
- tsize = asize;\r
- }\r
- else\r
- disable_contiguous(m); /* Don't try contiguous path in the future */\r
- }\r
-\r
- RELEASE_MALLOC_GLOBAL_LOCK();\r
- }\r
-\r
- if (HAVE_MMAP && tbase == CMFAIL) { /* Try MMAP */\r
- char* mp = (char*)(CALL_MMAP(asize));\r
- if (mp != CMFAIL) {\r
- tbase = mp;\r
- tsize = asize;\r
- mmap_flag = USE_MMAP_BIT;\r
- }\r
- }\r
-\r
- if (HAVE_MORECORE && tbase == CMFAIL) { /* Try noncontiguous MORECORE */\r
- if (asize < HALF_MAX_SIZE_T) {\r
- char* br = CMFAIL;\r
- char* end = CMFAIL;\r
- ACQUIRE_MALLOC_GLOBAL_LOCK();\r
- br = (char*)(CALL_MORECORE(asize));\r
- end = (char*)(CALL_MORECORE(0));\r
- RELEASE_MALLOC_GLOBAL_LOCK();\r
- if (br != CMFAIL && end != CMFAIL && br < end) {\r
- size_t ssize = end - br;\r
- if (ssize > nb + TOP_FOOT_SIZE) {\r
- tbase = br;\r
- tsize = ssize;\r
- }\r
- }\r
- }\r
- }\r
-\r
- if (tbase != CMFAIL) {\r
-\r
- if ((m->footprint += tsize) > m->max_footprint)\r
- m->max_footprint = m->footprint;\r
-\r
- if (!is_initialized(m)) { /* first-time initialization */\r
- if (m->least_addr == 0 || tbase < m->least_addr)\r
- m->least_addr = tbase;\r
- m->seg.base = tbase;\r
- m->seg.size = tsize;\r
- m->seg.sflags = mmap_flag;\r
- m->magic = mparams.magic;\r
- m->release_checks = MAX_RELEASE_CHECK_RATE;\r
- init_bins(m);\r
-#if !ONLY_MSPACES\r
- if (is_global(m))\r
- init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE);\r
- else\r
-#endif\r
- {\r
- /* Offset top by embedded malloc_state */\r
- mchunkptr mn = next_chunk(mem2chunk(m));\r
- init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) -TOP_FOOT_SIZE);\r
- }\r
- }\r
-\r
- else {\r
- /* Try to merge with an existing segment */\r
- msegmentptr sp = &m->seg;\r
- /* Only consider most recent segment if traversal suppressed */\r
- while (sp != 0 && tbase != sp->base + sp->size)\r
- sp = (NO_SEGMENT_TRAVERSAL) ? 0 : sp->next;\r
- if (sp != 0 &&\r
- !is_extern_segment(sp) &&\r
- (sp->sflags & USE_MMAP_BIT) == mmap_flag &&\r
- segment_holds(sp, m->top)) { /* append */\r
- sp->size += tsize;\r
- init_top(m, m->top, m->topsize + tsize);\r
- }\r
- else {\r
- if (tbase < m->least_addr)\r
- m->least_addr = tbase;\r
- sp = &m->seg;\r
- while (sp != 0 && sp->base != tbase + tsize)\r
- sp = (NO_SEGMENT_TRAVERSAL) ? 0 : sp->next;\r
- if (sp != 0 &&\r
- !is_extern_segment(sp) &&\r
- (sp->sflags & USE_MMAP_BIT) == mmap_flag) {\r
- char* oldbase = sp->base;\r
- sp->base = tbase;\r
- sp->size += tsize;\r
- return prepend_alloc(m, tbase, oldbase, nb);\r
- }\r
- else\r
- add_segment(m, tbase, tsize, mmap_flag);\r
- }\r
- }\r
-\r
- if (nb < m->topsize) { /* Allocate from new or extended top space */\r
- size_t rsize = m->topsize -= nb;\r
- mchunkptr p = m->top;\r
- mchunkptr r = m->top = chunk_plus_offset(p, nb);\r
- r->head = rsize | PINUSE_BIT;\r
- set_size_and_pinuse_of_inuse_chunk(m, p, nb);\r
- check_top_chunk(m, m->top);\r
- check_malloced_chunk(m, chunk2mem(p), nb);\r
- return chunk2mem(p);\r
- }\r
- }\r
-\r
- MALLOC_FAILURE_ACTION;\r
- return 0;\r
-}\r
-\r
-/* ----------------------- system deallocation -------------------------- */\r
-\r
-/* Unmap and unlink any mmapped segments that don't contain used chunks */\r
-static size_t release_unused_segments(mstate m) {\r
- size_t released = 0;\r
- int nsegs = 0;\r
- msegmentptr pred = &m->seg;\r
- msegmentptr sp = pred->next;\r
- while (sp != 0) {\r
- char* base = sp->base;\r
- size_t size = sp->size;\r
- msegmentptr next = sp->next;\r
- ++nsegs;\r
- if (is_mmapped_segment(sp) && !is_extern_segment(sp)) {\r
- mchunkptr p = align_as_chunk(base);\r
- size_t psize = chunksize(p);\r
- /* Can unmap if first chunk holds entire segment and not pinned */\r
- if (!is_inuse(p) && (char*)p + psize >= base + size - TOP_FOOT_SIZE) {\r
- tchunkptr tp = (tchunkptr)p;\r
- assert(segment_holds(sp, (char*)sp));\r
- if (p == m->dv) {\r
- m->dv = 0;\r
- m->dvsize = 0;\r
- }\r
- else {\r
- unlink_large_chunk(m, tp);\r
- }\r
- if (CALL_MUNMAP(base, size) == 0) {\r
- released += size;\r
- m->footprint -= size;\r
- /* unlink obsoleted record */\r
- sp = pred;\r
- sp->next = next;\r
- }\r
- else { /* back out if cannot unmap */\r
- insert_large_chunk(m, tp, psize);\r
- }\r
- }\r
- }\r
- if (NO_SEGMENT_TRAVERSAL) /* scan only first segment */\r
- break;\r
- pred = sp;\r
- sp = next;\r
- }\r
- /* Reset check counter */\r
- m->release_checks = ((nsegs > MAX_RELEASE_CHECK_RATE)?\r
- nsegs : MAX_RELEASE_CHECK_RATE);\r
- return released;\r
-}\r
-\r
-static int sys_trim(mstate m, size_t pad) {\r
- size_t released = 0;\r
- ensure_initialization();\r
- if (pad < MAX_REQUEST && is_initialized(m)) {\r
- pad += TOP_FOOT_SIZE; /* ensure enough room for segment overhead */\r
-\r
- if (m->topsize > pad) {\r
- /* Shrink top space in granularity-size units, keeping at least one */\r
- size_t unit = mparams.granularity;\r
- size_t extra = ((m->topsize - pad + (unit - SIZE_T_ONE)) / unit -\r
- SIZE_T_ONE) * unit;\r
- msegmentptr sp = segment_holding(m, (char*)m->top);\r
-\r
- if (!is_extern_segment(sp)) {\r
- if (is_mmapped_segment(sp)) {\r
- if (HAVE_MMAP &&\r
- sp->size >= extra &&\r
- !has_segment_link(m, sp)) { /* can't shrink if pinned */\r
- size_t newsize = sp->size - extra;\r
- /* Prefer mremap, fall back to munmap */\r
- if ((CALL_MREMAP(sp->base, sp->size, newsize, 0) != MFAIL) ||\r
- (CALL_MUNMAP(sp->base + newsize, extra) == 0)) {\r
- released = extra;\r
- }\r
- }\r
- }\r
- else if (HAVE_MORECORE) {\r
- if (extra >= HALF_MAX_SIZE_T) /* Avoid wrapping negative */\r
- extra = (HALF_MAX_SIZE_T) + SIZE_T_ONE - unit;\r
- ACQUIRE_MALLOC_GLOBAL_LOCK();\r
- {\r
- /* Make sure end of memory is where we last set it. */\r
- char* old_br = (char*)(CALL_MORECORE(0));\r
- if (old_br == sp->base + sp->size) {\r
- char* rel_br = (char*)(CALL_MORECORE(-extra));\r
- char* new_br = (char*)(CALL_MORECORE(0));\r
- if (rel_br != CMFAIL && new_br < old_br)\r
- released = old_br - new_br;\r
- }\r
- }\r
- RELEASE_MALLOC_GLOBAL_LOCK();\r
- }\r
- }\r
-\r
- if (released != 0) {\r
- sp->size -= released;\r
- m->footprint -= released;\r
- init_top(m, m->top, m->topsize - released);\r
- check_top_chunk(m, m->top);\r
- }\r
- }\r
-\r
- /* Unmap any unused mmapped segments */\r
- if (HAVE_MMAP)\r
- released += release_unused_segments(m);\r
-\r
- /* On failure, disable autotrim to avoid repeated failed future calls */\r
- if (released == 0 && m->topsize > m->trim_check)\r
- m->trim_check = MAX_SIZE_T;\r
- }\r
-\r
- return (released != 0)? 1 : 0;\r
-}\r
-\r
-/* Consolidate and bin a chunk. Differs from exported versions\r
- of free mainly in that the chunk need not be marked as inuse.\r
-*/\r
-static void dispose_chunk(mstate m, mchunkptr p, size_t psize) {\r
- mchunkptr next = chunk_plus_offset(p, psize);\r
- if (!pinuse(p)) {\r
- mchunkptr prev;\r
- size_t prevsize = p->prev_foot;\r
- if (is_mmapped(p)) {\r
- psize += prevsize + MMAP_FOOT_PAD;\r
- if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)\r
- m->footprint -= psize;\r
- return;\r
- }\r
- prev = chunk_minus_offset(p, prevsize);\r
- psize += prevsize;\r
- p = prev;\r
- if (RTCHECK(ok_address(m, prev))) { /* consolidate backward */\r
- if (p != m->dv) {\r
- unlink_chunk(m, p, prevsize);\r
- }\r
- else if ((next->head & INUSE_BITS) == INUSE_BITS) {\r
- m->dvsize = psize;\r
- set_free_with_pinuse(p, psize, next);\r
- return;\r
- }\r
- }\r
- else {\r
- CORRUPTION_ERROR_ACTION(m);\r
- return;\r
- }\r
- }\r
- if (RTCHECK(ok_address(m, next))) {\r
- if (!cinuse(next)) { /* consolidate forward */\r
- if (next == m->top) {\r
- size_t tsize = m->topsize += psize;\r
- m->top = p;\r
- p->head = tsize | PINUSE_BIT;\r
- if (p == m->dv) {\r
- m->dv = 0;\r
- m->dvsize = 0;\r
- }\r
- return;\r
- }\r
- else if (next == m->dv) {\r
- size_t dsize = m->dvsize += psize;\r
- m->dv = p;\r
- set_size_and_pinuse_of_free_chunk(p, dsize);\r
- return;\r
- }\r
- else {\r
- size_t nsize = chunksize(next);\r
- psize += nsize;\r
- unlink_chunk(m, next, nsize);\r
- set_size_and_pinuse_of_free_chunk(p, psize);\r
- if (p == m->dv) {\r
- m->dvsize = psize;\r
- return;\r
- }\r
- }\r
- }\r
- else {\r
- set_free_with_pinuse(p, psize, next);\r
- }\r
- insert_chunk(m, p, psize);\r
- }\r
- else {\r
- CORRUPTION_ERROR_ACTION(m);\r
- }\r
-}\r
-\r
-/* ---------------------------- malloc --------------------------- */\r
-\r
-/* allocate a large request from the best fitting chunk in a treebin */\r
-static void* tmalloc_large(mstate m, size_t nb) {\r
- tchunkptr v = 0;\r
- size_t rsize = -nb; /* Unsigned negation */\r
- tchunkptr t;\r
- bindex_t idx;\r
- compute_tree_index(nb, idx);\r
- if ((t = *treebin_at(m, idx)) != 0) {\r
- /* Traverse tree for this bin looking for node with size == nb */\r
- size_t sizebits = nb << leftshift_for_tree_index(idx);\r
- tchunkptr rst = 0; /* The deepest untaken right subtree */\r
- for (;;) {\r
- tchunkptr rt;\r
- size_t trem = chunksize(t) - nb;\r
- if (trem < rsize) {\r
- v = t;\r
- if ((rsize = trem) == 0)\r
- break;\r
- }\r
- rt = t->child[1];\r
- t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1];\r
- if (rt != 0 && rt != t)\r
- rst = rt;\r
- if (t == 0) {\r
- t = rst; /* set t to least subtree holding sizes > nb */\r
- break;\r
- }\r
- sizebits <<= 1;\r
- }\r
- }\r
- if (t == 0 && v == 0) { /* set t to root of next non-empty treebin */\r
- binmap_t leftbits = left_bits(idx2bit(idx)) & m->treemap;\r
- if (leftbits != 0) {\r
- bindex_t i;\r
- binmap_t leastbit = least_bit(leftbits);\r
- compute_bit2idx(leastbit, i);\r
- t = *treebin_at(m, i);\r
- }\r
- }\r
-\r
- while (t != 0) { /* find smallest of tree or subtree */\r
- size_t trem = chunksize(t) - nb;\r
- if (trem < rsize) {\r
- rsize = trem;\r
- v = t;\r
- }\r
- t = leftmost_child(t);\r
- }\r
-\r
- /* If dv is a better fit, return 0 so malloc will use it */\r
- if (v != 0 && rsize < (size_t)(m->dvsize - nb)) {\r
- if (RTCHECK(ok_address(m, v))) { /* split */\r
- mchunkptr r = chunk_plus_offset(v, nb);\r
- assert(chunksize(v) == rsize + nb);\r
- if (RTCHECK(ok_next(v, r))) {\r
- unlink_large_chunk(m, v);\r
- if (rsize < MIN_CHUNK_SIZE)\r
- set_inuse_and_pinuse(m, v, (rsize + nb));\r
- else {\r
- set_size_and_pinuse_of_inuse_chunk(m, v, nb);\r
- set_size_and_pinuse_of_free_chunk(r, rsize);\r
- insert_chunk(m, r, rsize);\r
- }\r
- return chunk2mem(v);\r
- }\r
- }\r
- CORRUPTION_ERROR_ACTION(m);\r
- }\r
- return 0;\r
-}\r
-\r
-/* allocate a small request from the best fitting chunk in a treebin */\r
-static void* tmalloc_small(mstate m, size_t nb) {\r
- tchunkptr t, v;\r
- size_t rsize;\r
- bindex_t i;\r
- binmap_t leastbit = least_bit(m->treemap);\r
- compute_bit2idx(leastbit, i);\r
- v = t = *treebin_at(m, i);\r
- rsize = chunksize(t) - nb;\r
-\r
- while ((t = leftmost_child(t)) != 0) {\r
- size_t trem = chunksize(t) - nb;\r
- if (trem < rsize) {\r
- rsize = trem;\r
- v = t;\r
- }\r
- }\r
-\r
- if (RTCHECK(ok_address(m, v))) {\r
- mchunkptr r = chunk_plus_offset(v, nb);\r
- assert(chunksize(v) == rsize + nb);\r
- if (RTCHECK(ok_next(v, r))) {\r
- unlink_large_chunk(m, v);\r
- if (rsize < MIN_CHUNK_SIZE)\r
- set_inuse_and_pinuse(m, v, (rsize + nb));\r
- else {\r
- set_size_and_pinuse_of_inuse_chunk(m, v, nb);\r
- set_size_and_pinuse_of_free_chunk(r, rsize);\r
- replace_dv(m, r, rsize);\r
- }\r
- return chunk2mem(v);\r
- }\r
- }\r
-\r
- CORRUPTION_ERROR_ACTION(m);\r
- return 0;\r
-}\r
-\r
-#if !ONLY_MSPACES\r
-\r
-void* dlmalloc(size_t bytes) {\r
- /*\r
- Basic algorithm:\r
- If a small request (< 256 bytes minus per-chunk overhead):\r
- 1. If one exists, use a remainderless chunk in associated smallbin.\r
- (Remainderless means that there are too few excess bytes to\r
- represent as a chunk.)\r
- 2. If it is big enough, use the dv chunk, which is normally the\r
- chunk adjacent to the one used for the most recent small request.\r
- 3. If one exists, split the smallest available chunk in a bin,\r
- saving remainder in dv.\r
- 4. If it is big enough, use the top chunk.\r
- 5. If available, get memory from system and use it\r
- Otherwise, for a large request:\r
- 1. Find the smallest available binned chunk that fits, and use it\r
- if it is better fitting than dv chunk, splitting if necessary.\r
- 2. If better fitting than any binned chunk, use the dv chunk.\r
- 3. If it is big enough, use the top chunk.\r
- 4. If request size >= mmap threshold, try to directly mmap this chunk.\r
- 5. If available, get memory from system and use it\r
-\r
- The ugly goto's here ensure that postaction occurs along all paths.\r
- */\r
-\r
-#if USE_LOCKS\r
- ensure_initialization(); /* initialize in sys_alloc if not using locks */\r
-#endif\r
-\r
- if (!PREACTION(gm)) {\r
- void* mem;\r
- size_t nb;\r
- if (bytes <= MAX_SMALL_REQUEST) {\r
- bindex_t idx;\r
- binmap_t smallbits;\r
- nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);\r
- idx = small_index(nb);\r
- smallbits = gm->smallmap >> idx;\r
-\r
- if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */\r
- mchunkptr b, p;\r
- idx += ~smallbits & 1; /* Uses next bin if idx empty */\r
- b = smallbin_at(gm, idx);\r
- p = b->fd;\r
- assert(chunksize(p) == small_index2size(idx));\r
- unlink_first_small_chunk(gm, b, p, idx);\r
- set_inuse_and_pinuse(gm, p, small_index2size(idx));\r
- mem = chunk2mem(p);\r
- check_malloced_chunk(gm, mem, nb);\r
- goto postaction;\r
- }\r
-\r
- else if (nb > gm->dvsize) {\r
- if (smallbits != 0) { /* Use chunk in next nonempty smallbin */\r
- mchunkptr b, p, r;\r
- size_t rsize;\r
- bindex_t i;\r
- binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));\r
- binmap_t leastbit = least_bit(leftbits);\r
- compute_bit2idx(leastbit, i);\r
- b = smallbin_at(gm, i);\r
- p = b->fd;\r
- assert(chunksize(p) == small_index2size(i));\r
- unlink_first_small_chunk(gm, b, p, i);\r
- rsize = small_index2size(i) - nb;\r
- /* Fit here cannot be remainderless if 4byte sizes */\r
- if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)\r
- set_inuse_and_pinuse(gm, p, small_index2size(i));\r
- else {\r
- set_size_and_pinuse_of_inuse_chunk(gm, p, nb);\r
- r = chunk_plus_offset(p, nb);\r
- set_size_and_pinuse_of_free_chunk(r, rsize);\r
- replace_dv(gm, r, rsize);\r
- }\r
- mem = chunk2mem(p);\r
- check_malloced_chunk(gm, mem, nb);\r
- goto postaction;\r
- }\r
-\r
- else if (gm->treemap != 0 && (mem = tmalloc_small(gm, nb)) != 0) {\r
- check_malloced_chunk(gm, mem, nb);\r
- goto postaction;\r
- }\r
- }\r
- }\r
- else if (bytes >= MAX_REQUEST)\r
- nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */\r
- else {\r
- nb = pad_request(bytes);\r
- if (gm->treemap != 0 && (mem = tmalloc_large(gm, nb)) != 0) {\r
- check_malloced_chunk(gm, mem, nb);\r
- goto postaction;\r
- }\r
- }\r
-\r
- if (nb <= gm->dvsize) {\r
- size_t rsize = gm->dvsize - nb;\r
- mchunkptr p = gm->dv;\r
- if (rsize >= MIN_CHUNK_SIZE) { /* split dv */\r
- mchunkptr r = gm->dv = chunk_plus_offset(p, nb);\r
- gm->dvsize = rsize;\r
- set_size_and_pinuse_of_free_chunk(r, rsize);\r
- set_size_and_pinuse_of_inuse_chunk(gm, p, nb);\r
- }\r
- else { /* exhaust dv */\r
- size_t dvs = gm->dvsize;\r
- gm->dvsize = 0;\r
- gm->dv = 0;\r
- set_inuse_and_pinuse(gm, p, dvs);\r
- }\r
- mem = chunk2mem(p);\r
- check_malloced_chunk(gm, mem, nb);\r
- goto postaction;\r
- }\r
-\r
- else if (nb < gm->topsize) { /* Split top */\r
- size_t rsize = gm->topsize -= nb;\r
- mchunkptr p = gm->top;\r
- mchunkptr r = gm->top = chunk_plus_offset(p, nb);\r
- r->head = rsize | PINUSE_BIT;\r
- set_size_and_pinuse_of_inuse_chunk(gm, p, nb);\r
- mem = chunk2mem(p);\r
- check_top_chunk(gm, gm->top);\r
- check_malloced_chunk(gm, mem, nb);\r
- goto postaction;\r
- }\r
-\r
- mem = sys_alloc(gm, nb);\r
-\r
- postaction:\r
- POSTACTION(gm);\r
- return mem;\r
- }\r
-\r
- return 0;\r
-}\r
-\r
-/* ---------------------------- free --------------------------- */\r
-\r
-void dlfree(void* mem) {\r
- /*\r
- Consolidate freed chunks with preceeding or succeeding bordering\r
- free chunks, if they exist, and then place in a bin. Intermixed\r
- with special cases for top, dv, mmapped chunks, and usage errors.\r
- */\r
-\r
- if (mem != 0) {\r
- mchunkptr p = mem2chunk(mem);\r
-#if FOOTERS\r
- mstate fm = get_mstate_for(p);\r
- if (!ok_magic(fm)) {\r
- USAGE_ERROR_ACTION(fm, p);\r
- return;\r
- }\r
-#else /* FOOTERS */\r
-#define fm gm\r
-#endif /* FOOTERS */\r
- if (!PREACTION(fm)) {\r
- check_inuse_chunk(fm, p);\r
- if (RTCHECK(ok_address(fm, p) && ok_inuse(p))) {\r
- size_t psize = chunksize(p);\r
- mchunkptr next = chunk_plus_offset(p, psize);\r
- if (!pinuse(p)) {\r
- size_t prevsize = p->prev_foot;\r
- if (is_mmapped(p)) {\r
- psize += prevsize + MMAP_FOOT_PAD;\r
- if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)\r
- fm->footprint -= psize;\r
- goto postaction;\r
- }\r
- else {\r
- mchunkptr prev = chunk_minus_offset(p, prevsize);\r
- psize += prevsize;\r
- p = prev;\r
- if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */\r
- if (p != fm->dv) {\r
- unlink_chunk(fm, p, prevsize);\r
- }\r
- else if ((next->head & INUSE_BITS) == INUSE_BITS) {\r
- fm->dvsize = psize;\r
- set_free_with_pinuse(p, psize, next);\r
- goto postaction;\r
- }\r
- }\r
- else\r
- goto erroraction;\r
- }\r
- }\r
-\r
- if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {\r
- if (!cinuse(next)) { /* consolidate forward */\r
- if (next == fm->top) {\r
- size_t tsize = fm->topsize += psize;\r
- fm->top = p;\r
- p->head = tsize | PINUSE_BIT;\r
- if (p == fm->dv) {\r
- fm->dv = 0;\r
- fm->dvsize = 0;\r
- }\r
- if (should_trim(fm, tsize))\r
- sys_trim(fm, 0);\r
- goto postaction;\r
- }\r
- else if (next == fm->dv) {\r
- size_t dsize = fm->dvsize += psize;\r
- fm->dv = p;\r
- set_size_and_pinuse_of_free_chunk(p, dsize);\r
- goto postaction;\r
- }\r
- else {\r
- size_t nsize = chunksize(next);\r
- psize += nsize;\r
- unlink_chunk(fm, next, nsize);\r
- set_size_and_pinuse_of_free_chunk(p, psize);\r
- if (p == fm->dv) {\r
- fm->dvsize = psize;\r
- goto postaction;\r
- }\r
- }\r
- }\r
- else\r
- set_free_with_pinuse(p, psize, next);\r
-\r
- if (is_small(psize)) {\r
- insert_small_chunk(fm, p, psize);\r
- check_free_chunk(fm, p);\r
- }\r
- else {\r
- tchunkptr tp = (tchunkptr)p;\r
- insert_large_chunk(fm, tp, psize);\r
- check_free_chunk(fm, p);\r
- if (--fm->release_checks == 0)\r
- release_unused_segments(fm);\r
- }\r
- goto postaction;\r
- }\r
- }\r
- erroraction:\r
- USAGE_ERROR_ACTION(fm, p);\r
- postaction:\r
- POSTACTION(fm);\r
- }\r
- }\r
-#if !FOOTERS\r
-#undef fm\r
-#endif /* FOOTERS */\r
-}\r
-\r
-void* dlcalloc(size_t n_elements, size_t elem_size) {\r
- void* mem;\r
- size_t req = 0;\r
- if (n_elements != 0) {\r
- req = n_elements * elem_size;\r
- if (((n_elements | elem_size) & ~(size_t)0xffff) &&\r
- (req / n_elements != elem_size))\r
- req = MAX_SIZE_T; /* force downstream failure on overflow */\r
- }\r
- mem = dlmalloc(req);\r
- if (mem != 0 && calloc_must_clear(mem2chunk(mem)))\r
- memset(mem, 0, req);\r
- return mem;\r
-}\r
-\r
-#endif /* !ONLY_MSPACES */\r
-\r
-/* ------------ Internal support for realloc, memalign, etc -------------- */\r
-\r
-/* Try to realloc; only in-place unless can_move true */\r
-static mchunkptr try_realloc_chunk(mstate m, mchunkptr p, size_t nb,\r
- int can_move) {\r
- mchunkptr newp = 0;\r
- size_t oldsize = chunksize(p);\r
- mchunkptr next = chunk_plus_offset(p, oldsize);\r
- if (RTCHECK(ok_address(m, p) && ok_inuse(p) &&\r
- ok_next(p, next) && ok_pinuse(next))) {\r
- if (is_mmapped(p)) {\r
- newp = mmap_resize(m, p, nb, can_move);\r
- }\r
- else if (oldsize >= nb) { /* already big enough */\r
- size_t rsize = oldsize - nb;\r
- if (rsize >= MIN_CHUNK_SIZE) { /* split off remainder */\r
- mchunkptr r = chunk_plus_offset(p, nb);\r
- set_inuse(m, p, nb);\r
- set_inuse(m, r, rsize);\r
- dispose_chunk(m, r, rsize);\r
- }\r
- newp = p;\r
- }\r
- else if (next == m->top) { /* extend into top */\r
- if (oldsize + m->topsize > nb) {\r
- size_t newsize = oldsize + m->topsize;\r
- size_t newtopsize = newsize - nb;\r
- mchunkptr newtop = chunk_plus_offset(p, nb);\r
- set_inuse(m, p, nb);\r
- newtop->head = newtopsize |PINUSE_BIT;\r
- m->top = newtop;\r
- m->topsize = newtopsize;\r
- newp = p;\r
- }\r
- }\r
- else if (next == m->dv) { /* extend into dv */\r
- size_t dvs = m->dvsize;\r
- if (oldsize + dvs >= nb) {\r
- size_t dsize = oldsize + dvs - nb;\r
- if (dsize >= MIN_CHUNK_SIZE) {\r
- mchunkptr r = chunk_plus_offset(p, nb);\r
- mchunkptr n = chunk_plus_offset(r, dsize);\r
- set_inuse(m, p, nb);\r
- set_size_and_pinuse_of_free_chunk(r, dsize);\r
- clear_pinuse(n);\r
- m->dvsize = dsize;\r
- m->dv = r;\r
- }\r
- else { /* exhaust dv */\r
- size_t newsize = oldsize + dvs;\r
- set_inuse(m, p, newsize);\r
- m->dvsize = 0;\r
- m->dv = 0;\r
- }\r
- newp = p;\r
- }\r
- }\r
- else if (!cinuse(next)) { /* extend into next free chunk */\r
- size_t nextsize = chunksize(next);\r
- if (oldsize + nextsize >= nb) {\r
- size_t rsize = oldsize + nextsize - nb;\r
- unlink_chunk(m, next, nextsize);\r
- if (rsize < MIN_CHUNK_SIZE) {\r
- size_t newsize = oldsize + nextsize;\r
- set_inuse(m, p, newsize);\r
- }\r
- else {\r
- mchunkptr r = chunk_plus_offset(p, nb);\r
- set_inuse(m, p, nb);\r
- set_inuse(m, r, rsize);\r
- dispose_chunk(m, r, rsize);\r
- }\r
- newp = p;\r
- }\r
- }\r
- }\r
- else {\r
- USAGE_ERROR_ACTION(m, oldmem);\r
- }\r
- return newp;\r
-}\r
-\r
-static void* internal_memalign(mstate m, size_t alignment, size_t bytes) {\r
- void* mem = 0;\r
- if (alignment < MIN_CHUNK_SIZE) /* must be at least a minimum chunk size */\r
- alignment = MIN_CHUNK_SIZE;\r
- if ((alignment & (alignment-SIZE_T_ONE)) != 0) {/* Ensure a power of 2 */\r
- size_t a = MALLOC_ALIGNMENT << 1;\r
- while (a < alignment) a <<= 1;\r
- alignment = a;\r
- }\r
- if (bytes >= MAX_REQUEST - alignment) {\r
- if (m != 0) { /* Test isn't needed but avoids compiler warning */\r
- MALLOC_FAILURE_ACTION;\r
- }\r
- }\r
- else {\r
- size_t nb = request2size(bytes);\r
- size_t req = nb + alignment + MIN_CHUNK_SIZE - CHUNK_OVERHEAD;\r
- mem = internal_malloc(m, req);\r
- if (mem != 0) {\r
- mchunkptr p = mem2chunk(mem);\r
- if (PREACTION(m))\r
- return 0;\r
- if ((((size_t)(mem)) & (alignment - 1)) != 0) { /* misaligned */\r
- /*\r
- Find an aligned spot inside chunk. Since we need to give\r
- back leading space in a chunk of at least MIN_CHUNK_SIZE, if\r
- the first calculation places us at a spot with less than\r
- MIN_CHUNK_SIZE leader, we can move to the next aligned spot.\r
- We've allocated enough total room so that this is always\r
- possible.\r
- */\r
- char* br = (char*)mem2chunk((size_t)(((size_t)((char*)mem + alignment -\r
- SIZE_T_ONE)) &\r
- -alignment));\r
- char* pos = ((size_t)(br - (char*)(p)) >= MIN_CHUNK_SIZE)?\r
- br : br+alignment;\r
- mchunkptr newp = (mchunkptr)pos;\r
- size_t leadsize = pos - (char*)(p);\r
- size_t newsize = chunksize(p) - leadsize;\r
-\r
- if (is_mmapped(p)) { /* For mmapped chunks, just adjust offset */\r
- newp->prev_foot = p->prev_foot + leadsize;\r
- newp->head = newsize;\r
- }\r
- else { /* Otherwise, give back leader, use the rest */\r
- set_inuse(m, newp, newsize);\r
- set_inuse(m, p, leadsize);\r
- dispose_chunk(m, p, leadsize);\r
- }\r
- p = newp;\r
- }\r
-\r
- /* Give back spare room at the end */\r
- if (!is_mmapped(p)) {\r
- size_t size = chunksize(p);\r
- if (size > nb + MIN_CHUNK_SIZE) {\r
- size_t remainder_size = size - nb;\r
- mchunkptr remainder = chunk_plus_offset(p, nb);\r
- set_inuse(m, p, nb);\r
- set_inuse(m, remainder, remainder_size);\r
- dispose_chunk(m, remainder, remainder_size);\r
- }\r
- }\r
-\r
- mem = chunk2mem(p);\r
- assert (chunksize(p) >= nb);\r
- assert(((size_t)mem & (alignment - 1)) == 0);\r
- check_inuse_chunk(m, p);\r
- POSTACTION(m);\r
- }\r
- }\r
- return mem;\r
-}\r
-\r
-/*\r
- Common support for independent_X routines, handling\r
- all of the combinations that can result.\r
- The opts arg has:\r
- bit 0 set if all elements are same size (using sizes[0])\r
- bit 1 set if elements should be zeroed\r
-*/\r
-static void** ialloc(mstate m,\r
- size_t n_elements,\r
- size_t* sizes,\r
- int opts,\r
- void* chunks[]) {\r
-\r
- size_t element_size; /* chunksize of each element, if all same */\r
- size_t contents_size; /* total size of elements */\r
- size_t array_size; /* request size of pointer array */\r
- void* mem; /* malloced aggregate space */\r
- mchunkptr p; /* corresponding chunk */\r
- size_t remainder_size; /* remaining bytes while splitting */\r
- void** marray; /* either "chunks" or malloced ptr array */\r
- mchunkptr array_chunk; /* chunk for malloced ptr array */\r
- flag_t was_enabled; /* to disable mmap */\r
- size_t size;\r
- size_t i;\r
-\r
- ensure_initialization();\r
- /* compute array length, if needed */\r
- if (chunks != 0) {\r
- if (n_elements == 0)\r
- return chunks; /* nothing to do */\r
- marray = chunks;\r
- array_size = 0;\r
- }\r
- else {\r
- /* if empty req, must still return chunk representing empty array */\r
- if (n_elements == 0)\r
- return (void**)internal_malloc(m, 0);\r
- marray = 0;\r
- array_size = request2size(n_elements * (sizeof(void*)));\r
- }\r
-\r
- /* compute total element size */\r
- if (opts & 0x1) { /* all-same-size */\r
- element_size = request2size(*sizes);\r
- contents_size = n_elements * element_size;\r
- }\r
- else { /* add up all the sizes */\r
- element_size = 0;\r
- contents_size = 0;\r
- for (i = 0; i != n_elements; ++i)\r
- contents_size += request2size(sizes[i]);\r
- }\r
-\r
- size = contents_size + array_size;\r
-\r
- /*\r
- Allocate the aggregate chunk. First disable direct-mmapping so\r
- malloc won't use it, since we would not be able to later\r
- free/realloc space internal to a segregated mmap region.\r
- */\r
- was_enabled = use_mmap(m);\r
- disable_mmap(m);\r
- mem = internal_malloc(m, size - CHUNK_OVERHEAD);\r
- if (was_enabled)\r
- enable_mmap(m);\r
- if (mem == 0)\r
- return 0;\r
-\r
- if (PREACTION(m)) return 0;\r
- p = mem2chunk(mem);\r
- remainder_size = chunksize(p);\r
-\r
- assert(!is_mmapped(p));\r
-\r
- if (opts & 0x2) { /* optionally clear the elements */\r
- memset((size_t*)mem, 0, remainder_size - SIZE_T_SIZE - array_size);\r
- }\r
-\r
- /* If not provided, allocate the pointer array as final part of chunk */\r
- if (marray == 0) {\r
- size_t array_chunk_size;\r
- array_chunk = chunk_plus_offset(p, contents_size);\r
- array_chunk_size = remainder_size - contents_size;\r
- marray = (void**) (chunk2mem(array_chunk));\r
- set_size_and_pinuse_of_inuse_chunk(m, array_chunk, array_chunk_size);\r
- remainder_size = contents_size;\r
- }\r
-\r
- /* split out elements */\r
- for (i = 0; ; ++i) {\r
- marray[i] = chunk2mem(p);\r
- if (i != n_elements-1) {\r
- if (element_size != 0)\r
- size = element_size;\r
- else\r
- size = request2size(sizes[i]);\r
- remainder_size -= size;\r
- set_size_and_pinuse_of_inuse_chunk(m, p, size);\r
- p = chunk_plus_offset(p, size);\r
- }\r
- else { /* the final element absorbs any overallocation slop */\r
- set_size_and_pinuse_of_inuse_chunk(m, p, remainder_size);\r
- break;\r
- }\r
- }\r
-\r
-#if DEBUG\r
- if (marray != chunks) {\r
- /* final element must have exactly exhausted chunk */\r
- if (element_size != 0) {\r
- assert(remainder_size == element_size);\r
- }\r
- else {\r
- assert(remainder_size == request2size(sizes[i]));\r
- }\r
- check_inuse_chunk(m, mem2chunk(marray));\r
- }\r
- for (i = 0; i != n_elements; ++i)\r
- check_inuse_chunk(m, mem2chunk(marray[i]));\r
-\r
-#endif /* DEBUG */\r
-\r
- POSTACTION(m);\r
- return marray;\r
-}\r
-\r
-/* Try to free all pointers in the given array.\r
- Note: this could be made faster, by delaying consolidation,\r
- at the price of disabling some user integrity checks, We\r
- still optimize some consolidations by combining adjacent\r
- chunks before freeing, which will occur often if allocated\r
- with ialloc or the array is sorted.\r
-*/\r
-static size_t internal_bulk_free(mstate m, void* array[], size_t nelem) {\r
- size_t unfreed = 0;\r
- if (!PREACTION(m)) {\r
- void** a;\r
- void** fence = &(array[nelem]);\r
- for (a = array; a != fence; ++a) {\r
- void* mem = *a;\r
- if (mem != 0) {\r
- mchunkptr p = mem2chunk(mem);\r
- size_t psize = chunksize(p);\r
-#if FOOTERS\r
- if (get_mstate_for(p) != m) {\r
- ++unfreed;\r
- continue;\r
- }\r
-#endif\r
- check_inuse_chunk(m, p);\r
- *a = 0;\r
- if (RTCHECK(ok_address(m, p) && ok_inuse(p))) {\r
- void ** b = a + 1; /* try to merge with next chunk */\r
- mchunkptr next = next_chunk(p);\r
- if (b != fence && *b == chunk2mem(next)) {\r
- size_t newsize = chunksize(next) + psize;\r
- set_inuse(m, p, newsize);\r
- *b = chunk2mem(p);\r
- }\r
- else\r
- dispose_chunk(m, p, psize);\r
- }\r
- else {\r
- CORRUPTION_ERROR_ACTION(m);\r
- break;\r
- }\r
- }\r
- }\r
- if (should_trim(m, m->topsize))\r
- sys_trim(m, 0);\r
- POSTACTION(m);\r
- }\r
- return unfreed;\r
-}\r
-\r
-/* Traversal */\r
-#if MALLOC_INSPECT_ALL\r
-static void internal_inspect_all(mstate m,\r
- void(*handler)(void *start,\r
- void *end,\r
- size_t used_bytes,\r
- void* callback_arg),\r
- void* arg) {\r
- if (is_initialized(m)) {\r
- mchunkptr top = m->top;\r
- msegmentptr s;\r
- for (s = &m->seg; s != 0; s = s->next) {\r
- mchunkptr q = align_as_chunk(s->base);\r
- while (segment_holds(s, q) && q->head != FENCEPOST_HEAD) {\r
- mchunkptr next = next_chunk(q);\r
- size_t sz = chunksize(q);\r
- size_t used;\r
- void* start;\r
- if (is_inuse(q)) {\r
- used = sz - CHUNK_OVERHEAD; /* must not be mmapped */\r
- start = chunk2mem(q);\r
- }\r
- else {\r
- used = 0;\r
- if (is_small(sz)) { /* offset by possible bookkeeping */\r
- start = (void*)((char*)q + sizeof(malloc_chunk));\r
- }\r
- else {\r
- start = (void*)((char*)q + sizeof(malloc_tree_chunk));\r
- }\r
- }\r
- if (start < (void*)next) /* skip if all space is bookkeeping */\r
- handler(start, next, used, arg);\r
- if (q == top)\r
- break;\r
- q = next;\r
- }\r
- }\r
- }\r
-}\r
-#endif /* MALLOC_INSPECT_ALL */\r
-\r
-/* ------------------ Exported realloc, memalign, etc -------------------- */\r
-\r
-#if !ONLY_MSPACES\r
-\r
-void* dlrealloc(void* oldmem, size_t bytes) {\r
- void* mem = 0;\r
- if (oldmem == 0) {\r
- mem = dlmalloc(bytes);\r
- }\r
- else if (bytes >= MAX_REQUEST) {\r
- MALLOC_FAILURE_ACTION;\r
- }\r
-#ifdef REALLOC_ZERO_BYTES_FREES\r
- else if (bytes == 0) {\r
- dlfree(oldmem);\r
- }\r
-#endif /* REALLOC_ZERO_BYTES_FREES */\r
- else {\r
- size_t nb = request2size(bytes);\r
- mchunkptr oldp = mem2chunk(oldmem);\r
-#if ! FOOTERS\r
- mstate m = gm;\r
-#else /* FOOTERS */\r
- mstate m = get_mstate_for(oldp);\r
- if (!ok_magic(m)) {\r
- USAGE_ERROR_ACTION(m, oldmem);\r
- return 0;\r
- }\r
-#endif /* FOOTERS */\r
- if (!PREACTION(m)) {\r
- mchunkptr newp = try_realloc_chunk(m, oldp, nb, 1);\r
- POSTACTION(m);\r
- if (newp != 0) {\r
- check_inuse_chunk(m, newp);\r
- mem = chunk2mem(newp);\r
- }\r
- else {\r
- mem = internal_malloc(m, bytes);\r
- if (mem != 0) {\r
- size_t oc = chunksize(oldp) - overhead_for(oldp);\r
- memcpy(mem, oldmem, (oc < bytes)? oc : bytes);\r
- internal_free(m, oldmem);\r
- }\r
- }\r
- }\r
- }\r
- return mem;\r
-}\r
-\r
-void* dlrealloc_in_place(void* oldmem, size_t bytes) {\r
- void* mem = 0;\r
- if (oldmem != 0) {\r
- if (bytes >= MAX_REQUEST) {\r
- MALLOC_FAILURE_ACTION;\r
- }\r
- else {\r
- size_t nb = request2size(bytes);\r
- mchunkptr oldp = mem2chunk(oldmem);\r
-#if ! FOOTERS\r
- mstate m = gm;\r
-#else /* FOOTERS */\r
- mstate m = get_mstate_for(oldp);\r
- if (!ok_magic(m)) {\r
- USAGE_ERROR_ACTION(m, oldmem);\r
- return 0;\r
- }\r
-#endif /* FOOTERS */\r
- if (!PREACTION(m)) {\r
- mchunkptr newp = try_realloc_chunk(m, oldp, nb, 0);\r
- POSTACTION(m);\r
- if (newp == oldp) {\r
- check_inuse_chunk(m, newp);\r
- mem = oldmem;\r
- }\r
- }\r
- }\r
- }\r
- return mem;\r
-}\r
-\r
-void* dlmemalign(size_t alignment, size_t bytes) {\r
- if (alignment <= MALLOC_ALIGNMENT) {\r
- return dlmalloc(bytes);\r
- }\r
- return internal_memalign(gm, alignment, bytes);\r
-}\r
-\r
-int dlposix_memalign(void** pp, size_t alignment, size_t bytes) {\r
- void* mem = 0;\r
- if (alignment == MALLOC_ALIGNMENT)\r
- mem = dlmalloc(bytes);\r
- else {\r
- size_t d = alignment / sizeof(void*);\r
- size_t r = alignment % sizeof(void*);\r
- if (r != 0 || d == 0 || (d & (d-SIZE_T_ONE)) != 0)\r
- return EINVAL;\r
- else if (bytes >= MAX_REQUEST - alignment) {\r
- if (alignment < MIN_CHUNK_SIZE)\r
- alignment = MIN_CHUNK_SIZE;\r
- mem = internal_memalign(gm, alignment, bytes);\r
- }\r
- }\r
- if (mem == 0)\r
- return ENOMEM;\r
- else {\r
- *pp = mem;\r
- return 0;\r
- }\r
-}\r
-\r
-void* dlvalloc(size_t bytes) {\r
- size_t pagesz;\r
- ensure_initialization();\r
- pagesz = mparams.page_size;\r
- return dlmemalign(pagesz, bytes);\r
-}\r
-\r
-void* dlpvalloc(size_t bytes) {\r
- size_t pagesz;\r
- ensure_initialization();\r
- pagesz = mparams.page_size;\r
- return dlmemalign(pagesz, (bytes + pagesz - SIZE_T_ONE) & ~(pagesz - SIZE_T_ONE));\r
-}\r
-\r
-void** dlindependent_calloc(size_t n_elements, size_t elem_size,\r
- void* chunks[]) {\r
- size_t sz = elem_size; /* serves as 1-element array */\r
- return ialloc(gm, n_elements, &sz, 3, chunks);\r
-}\r
-\r
-void** dlindependent_comalloc(size_t n_elements, size_t sizes[],\r
- void* chunks[]) {\r
- return ialloc(gm, n_elements, sizes, 0, chunks);\r
-}\r
-\r
-size_t dlbulk_free(void* array[], size_t nelem) {\r
- return internal_bulk_free(gm, array, nelem);\r
-}\r
-\r
-#if MALLOC_INSPECT_ALL\r
-void dlmalloc_inspect_all(void(*handler)(void *start,\r
- void *end,\r
- size_t used_bytes,\r
- void* callback_arg),\r
- void* arg) {\r
- ensure_initialization();\r
- if (!PREACTION(gm)) {\r
- internal_inspect_all(gm, handler, arg);\r
- POSTACTION(gm);\r
- }\r
-}\r
-#endif /* MALLOC_INSPECT_ALL */\r
-\r
-int dlmalloc_trim(size_t pad) {\r
- int result = 0;\r
- ensure_initialization();\r
- if (!PREACTION(gm)) {\r
- result = sys_trim(gm, pad);\r
- POSTACTION(gm);\r
- }\r
- return result;\r
-}\r
-\r
-size_t dlmalloc_footprint(void) {\r
- return gm->footprint;\r
-}\r
-\r
-size_t dlmalloc_max_footprint(void) {\r
- return gm->max_footprint;\r
-}\r
-\r
-size_t dlmalloc_footprint_limit(void) {\r
- size_t maf = gm->footprint_limit;\r
- return maf == 0 ? MAX_SIZE_T : maf;\r
-}\r
-\r
-size_t dlmalloc_set_footprint_limit(size_t bytes) {\r
- size_t result; /* invert sense of 0 */\r
- if (bytes == 0)\r
- result = granularity_align(1); /* Use minimal size */\r
- if (bytes == MAX_SIZE_T)\r
- result = 0; /* disable */\r
- else\r
- result = granularity_align(bytes);\r
- return gm->footprint_limit = result;\r
-}\r
-\r
-#if !NO_MALLINFO\r
-struct mallinfo dlmallinfo(void) {\r
- return internal_mallinfo(gm);\r
-}\r
-#endif /* NO_MALLINFO */\r
-\r
-#if !NO_MALLOC_STATS\r
-void dlmalloc_stats() {\r
- internal_malloc_stats(gm);\r
-}\r
-#endif /* NO_MALLOC_STATS */\r
-\r
-int dlmallopt(int param_number, int value) {\r
- return change_mparam(param_number, value);\r
-}\r
-\r
-size_t dlmalloc_usable_size(void* mem) {\r
- if (mem != 0) {\r
- mchunkptr p = mem2chunk(mem);\r
- if (is_inuse(p))\r
- return chunksize(p) - overhead_for(p);\r
- }\r
- return 0;\r
-}\r
-\r
-#endif /* !ONLY_MSPACES */\r
-\r
-/* ----------------------------- user mspaces ---------------------------- */\r
-\r
-#if MSPACES\r
-\r
-static mstate init_user_mstate(char* tbase, size_t tsize) {\r
- size_t msize = pad_request(sizeof(struct malloc_state));\r
- mchunkptr mn;\r
- mchunkptr msp = align_as_chunk(tbase);\r
- mstate m = (mstate)(chunk2mem(msp));\r
- memset(m, 0, msize);\r
- (void)INITIAL_LOCK(&m->mutex);\r
- msp->head = (msize|INUSE_BITS);\r
- m->seg.base = m->least_addr = tbase;\r
- m->seg.size = m->footprint = m->max_footprint = tsize;\r
- m->magic = mparams.magic;\r
- m->release_checks = MAX_RELEASE_CHECK_RATE;\r
- m->mflags = mparams.default_mflags;\r
- m->extp = 0;\r
- m->exts = 0;\r
- disable_contiguous(m);\r
- init_bins(m);\r
- mn = next_chunk(mem2chunk(m));\r
- init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) - TOP_FOOT_SIZE);\r
- check_top_chunk(m, m->top);\r
- return m;\r
-}\r
-\r
-mspace create_mspace(size_t capacity, int locked) {\r
- mstate m = 0;\r
- size_t msize;\r
- ensure_initialization();\r
- msize = pad_request(sizeof(struct malloc_state));\r
- if (capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {\r
- size_t rs = ((capacity == 0)? mparams.granularity :\r
- (capacity + TOP_FOOT_SIZE + msize));\r
- size_t tsize = granularity_align(rs);\r
- char* tbase = (char*)(CALL_MMAP(tsize));\r
- if (tbase != CMFAIL) {\r
- m = init_user_mstate(tbase, tsize);\r
- m->seg.sflags = USE_MMAP_BIT;\r
- set_lock(m, locked);\r
- }\r
- }\r
- return (mspace)m;\r
-}\r
-\r
-mspace create_mspace_with_base(void* base, size_t capacity, int locked) {\r
- mstate m = 0;\r
- size_t msize;\r
- ensure_initialization();\r
- msize = pad_request(sizeof(struct malloc_state));\r
- if (capacity > msize + TOP_FOOT_SIZE &&\r
- capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {\r
- m = init_user_mstate((char*)base, capacity);\r
- m->seg.sflags = EXTERN_BIT;\r
- set_lock(m, locked);\r
- }\r
- return (mspace)m;\r
-}\r
-\r
-int mspace_track_large_chunks(mspace msp, int enable) {\r
- int ret = 0;\r
- mstate ms = (mstate)msp;\r
- if (!PREACTION(ms)) {\r
- if (!use_mmap(ms))\r
- ret = 1;\r
- if (!enable)\r
- enable_mmap(ms);\r
- else\r
- disable_mmap(ms);\r
- POSTACTION(ms);\r
- }\r
- return ret;\r
-}\r
-\r
-size_t destroy_mspace(mspace msp) {\r
- size_t freed = 0;\r
- mstate ms = (mstate)msp;\r
- if (ok_magic(ms)) {\r
- msegmentptr sp = &ms->seg;\r
- (void)DESTROY_LOCK(&ms->mutex); /* destroy before unmapped */\r
- while (sp != 0) {\r
- char* base = sp->base;\r
- size_t size = sp->size;\r
- flag_t flag = sp->sflags;\r
- sp = sp->next;\r
- if ((flag & USE_MMAP_BIT) && !(flag & EXTERN_BIT) &&\r
- CALL_MUNMAP(base, size) == 0)\r
- freed += size;\r
- }\r
- }\r
- else {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- }\r
- return freed;\r
-}\r
-\r
-/*\r
- mspace versions of routines are near-clones of the global\r
- versions. This is not so nice but better than the alternatives.\r
-*/\r
-\r
-void* mspace_malloc(mspace msp, size_t bytes) {\r
- mstate ms = (mstate)msp;\r
- if (!ok_magic(ms)) {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- return 0;\r
- }\r
- if (!PREACTION(ms)) {\r
- void* mem;\r
- size_t nb;\r
- if (bytes <= MAX_SMALL_REQUEST) {\r
- bindex_t idx;\r
- binmap_t smallbits;\r
- nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);\r
- idx = small_index(nb);\r
- smallbits = ms->smallmap >> idx;\r
-\r
- if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */\r
- mchunkptr b, p;\r
- idx += ~smallbits & 1; /* Uses next bin if idx empty */\r
- b = smallbin_at(ms, idx);\r
- p = b->fd;\r
- assert(chunksize(p) == small_index2size(idx));\r
- unlink_first_small_chunk(ms, b, p, idx);\r
- set_inuse_and_pinuse(ms, p, small_index2size(idx));\r
- mem = chunk2mem(p);\r
- check_malloced_chunk(ms, mem, nb);\r
- goto postaction;\r
- }\r
-\r
- else if (nb > ms->dvsize) {\r
- if (smallbits != 0) { /* Use chunk in next nonempty smallbin */\r
- mchunkptr b, p, r;\r
- size_t rsize;\r
- bindex_t i;\r
- binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));\r
- binmap_t leastbit = least_bit(leftbits);\r
- compute_bit2idx(leastbit, i);\r
- b = smallbin_at(ms, i);\r
- p = b->fd;\r
- assert(chunksize(p) == small_index2size(i));\r
- unlink_first_small_chunk(ms, b, p, i);\r
- rsize = small_index2size(i) - nb;\r
- /* Fit here cannot be remainderless if 4byte sizes */\r
- if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)\r
- set_inuse_and_pinuse(ms, p, small_index2size(i));\r
- else {\r
- set_size_and_pinuse_of_inuse_chunk(ms, p, nb);\r
- r = chunk_plus_offset(p, nb);\r
- set_size_and_pinuse_of_free_chunk(r, rsize);\r
- replace_dv(ms, r, rsize);\r
- }\r
- mem = chunk2mem(p);\r
- check_malloced_chunk(ms, mem, nb);\r
- goto postaction;\r
- }\r
-\r
- else if (ms->treemap != 0 && (mem = tmalloc_small(ms, nb)) != 0) {\r
- check_malloced_chunk(ms, mem, nb);\r
- goto postaction;\r
- }\r
- }\r
- }\r
- else if (bytes >= MAX_REQUEST)\r
- nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */\r
- else {\r
- nb = pad_request(bytes);\r
- if (ms->treemap != 0 && (mem = tmalloc_large(ms, nb)) != 0) {\r
- check_malloced_chunk(ms, mem, nb);\r
- goto postaction;\r
- }\r
- }\r
-\r
- if (nb <= ms->dvsize) {\r
- size_t rsize = ms->dvsize - nb;\r
- mchunkptr p = ms->dv;\r
- if (rsize >= MIN_CHUNK_SIZE) { /* split dv */\r
- mchunkptr r = ms->dv = chunk_plus_offset(p, nb);\r
- ms->dvsize = rsize;\r
- set_size_and_pinuse_of_free_chunk(r, rsize);\r
- set_size_and_pinuse_of_inuse_chunk(ms, p, nb);\r
- }\r
- else { /* exhaust dv */\r
- size_t dvs = ms->dvsize;\r
- ms->dvsize = 0;\r
- ms->dv = 0;\r
- set_inuse_and_pinuse(ms, p, dvs);\r
- }\r
- mem = chunk2mem(p);\r
- check_malloced_chunk(ms, mem, nb);\r
- goto postaction;\r
- }\r
-\r
- else if (nb < ms->topsize) { /* Split top */\r
- size_t rsize = ms->topsize -= nb;\r
- mchunkptr p = ms->top;\r
- mchunkptr r = ms->top = chunk_plus_offset(p, nb);\r
- r->head = rsize | PINUSE_BIT;\r
- set_size_and_pinuse_of_inuse_chunk(ms, p, nb);\r
- mem = chunk2mem(p);\r
- check_top_chunk(ms, ms->top);\r
- check_malloced_chunk(ms, mem, nb);\r
- goto postaction;\r
- }\r
-\r
- mem = sys_alloc(ms, nb);\r
-\r
- postaction:\r
- POSTACTION(ms);\r
- return mem;\r
- }\r
-\r
- return 0;\r
-}\r
-\r
-void mspace_free(mspace msp, void* mem) {\r
- if (mem != 0) {\r
- mchunkptr p = mem2chunk(mem);\r
-#if FOOTERS\r
- mstate fm = get_mstate_for(p);\r
- msp = msp; /* placate people compiling -Wunused */\r
-#else /* FOOTERS */\r
- mstate fm = (mstate)msp;\r
-#endif /* FOOTERS */\r
- if (!ok_magic(fm)) {\r
- USAGE_ERROR_ACTION(fm, p);\r
- return;\r
- }\r
- if (!PREACTION(fm)) {\r
- check_inuse_chunk(fm, p);\r
- if (RTCHECK(ok_address(fm, p) && ok_inuse(p))) {\r
- size_t psize = chunksize(p);\r
- mchunkptr next = chunk_plus_offset(p, psize);\r
- if (!pinuse(p)) {\r
- size_t prevsize = p->prev_foot;\r
- if (is_mmapped(p)) {\r
- psize += prevsize + MMAP_FOOT_PAD;\r
- if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)\r
- fm->footprint -= psize;\r
- goto postaction;\r
- }\r
- else {\r
- mchunkptr prev = chunk_minus_offset(p, prevsize);\r
- psize += prevsize;\r
- p = prev;\r
- if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */\r
- if (p != fm->dv) {\r
- unlink_chunk(fm, p, prevsize);\r
- }\r
- else if ((next->head & INUSE_BITS) == INUSE_BITS) {\r
- fm->dvsize = psize;\r
- set_free_with_pinuse(p, psize, next);\r
- goto postaction;\r
- }\r
- }\r
- else\r
- goto erroraction;\r
- }\r
- }\r
-\r
- if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {\r
- if (!cinuse(next)) { /* consolidate forward */\r
- if (next == fm->top) {\r
- size_t tsize = fm->topsize += psize;\r
- fm->top = p;\r
- p->head = tsize | PINUSE_BIT;\r
- if (p == fm->dv) {\r
- fm->dv = 0;\r
- fm->dvsize = 0;\r
- }\r
- if (should_trim(fm, tsize))\r
- sys_trim(fm, 0);\r
- goto postaction;\r
- }\r
- else if (next == fm->dv) {\r
- size_t dsize = fm->dvsize += psize;\r
- fm->dv = p;\r
- set_size_and_pinuse_of_free_chunk(p, dsize);\r
- goto postaction;\r
- }\r
- else {\r
- size_t nsize = chunksize(next);\r
- psize += nsize;\r
- unlink_chunk(fm, next, nsize);\r
- set_size_and_pinuse_of_free_chunk(p, psize);\r
- if (p == fm->dv) {\r
- fm->dvsize = psize;\r
- goto postaction;\r
- }\r
- }\r
- }\r
- else\r
- set_free_with_pinuse(p, psize, next);\r
-\r
- if (is_small(psize)) {\r
- insert_small_chunk(fm, p, psize);\r
- check_free_chunk(fm, p);\r
- }\r
- else {\r
- tchunkptr tp = (tchunkptr)p;\r
- insert_large_chunk(fm, tp, psize);\r
- check_free_chunk(fm, p);\r
- if (--fm->release_checks == 0)\r
- release_unused_segments(fm);\r
- }\r
- goto postaction;\r
- }\r
- }\r
- erroraction:\r
- USAGE_ERROR_ACTION(fm, p);\r
- postaction:\r
- POSTACTION(fm);\r
- }\r
- }\r
-}\r
-\r
-void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size) {\r
- void* mem;\r
- size_t req = 0;\r
- mstate ms = (mstate)msp;\r
- if (!ok_magic(ms)) {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- return 0;\r
- }\r
- if (n_elements != 0) {\r
- req = n_elements * elem_size;\r
- if (((n_elements | elem_size) & ~(size_t)0xffff) &&\r
- (req / n_elements != elem_size))\r
- req = MAX_SIZE_T; /* force downstream failure on overflow */\r
- }\r
- mem = internal_malloc(ms, req);\r
- if (mem != 0 && calloc_must_clear(mem2chunk(mem)))\r
- memset(mem, 0, req);\r
- return mem;\r
-}\r
-\r
-void* mspace_realloc(mspace msp, void* oldmem, size_t bytes) {\r
- void* mem = 0;\r
- if (oldmem == 0) {\r
- mem = mspace_malloc(msp, bytes);\r
- }\r
- else if (bytes >= MAX_REQUEST) {\r
- MALLOC_FAILURE_ACTION;\r
- }\r
-#ifdef REALLOC_ZERO_BYTES_FREES\r
- else if (bytes == 0) {\r
- mspace_free(msp, oldmem);\r
- }\r
-#endif /* REALLOC_ZERO_BYTES_FREES */\r
- else {\r
- size_t nb = request2size(bytes);\r
- mchunkptr oldp = mem2chunk(oldmem);\r
-#if ! FOOTERS\r
- mstate m = (mstate)msp;\r
-#else /* FOOTERS */\r
- mstate m = get_mstate_for(oldp);\r
- if (!ok_magic(m)) {\r
- USAGE_ERROR_ACTION(m, oldmem);\r
- return 0;\r
- }\r
-#endif /* FOOTERS */\r
- if (!PREACTION(m)) {\r
- mchunkptr newp = try_realloc_chunk(m, oldp, nb, 1);\r
- POSTACTION(m);\r
- if (newp != 0) {\r
- check_inuse_chunk(m, newp);\r
- mem = chunk2mem(newp);\r
- }\r
- else {\r
- mem = mspace_malloc(m, bytes);\r
- if (mem != 0) {\r
- size_t oc = chunksize(oldp) - overhead_for(oldp);\r
- memcpy(mem, oldmem, (oc < bytes)? oc : bytes);\r
- mspace_free(m, oldmem);\r
- }\r
- }\r
- }\r
- }\r
- return mem;\r
-}\r
-\r
-void* mspace_realloc_in_place(mspace msp, void* oldmem, size_t bytes) {\r
- void* mem = 0;\r
- if (oldmem != 0) {\r
- if (bytes >= MAX_REQUEST) {\r
- MALLOC_FAILURE_ACTION;\r
- }\r
- else {\r
- size_t nb = request2size(bytes);\r
- mchunkptr oldp = mem2chunk(oldmem);\r
-#if ! FOOTERS\r
- mstate m = (mstate)msp;\r
-#else /* FOOTERS */\r
- mstate m = get_mstate_for(oldp);\r
- msp = msp; /* placate people compiling -Wunused */\r
- if (!ok_magic(m)) {\r
- USAGE_ERROR_ACTION(m, oldmem);\r
- return 0;\r
- }\r
-#endif /* FOOTERS */\r
- if (!PREACTION(m)) {\r
- mchunkptr newp = try_realloc_chunk(m, oldp, nb, 0);\r
- POSTACTION(m);\r
- if (newp == oldp) {\r
- check_inuse_chunk(m, newp);\r
- mem = oldmem;\r
- }\r
- }\r
- }\r
- }\r
- return mem;\r
-}\r
-\r
-void* mspace_memalign(mspace msp, size_t alignment, size_t bytes) {\r
- mstate ms = (mstate)msp;\r
- if (!ok_magic(ms)) {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- return 0;\r
- }\r
- if (alignment <= MALLOC_ALIGNMENT)\r
- return mspace_malloc(msp, bytes);\r
- return internal_memalign(ms, alignment, bytes);\r
-}\r
-\r
-void** mspace_independent_calloc(mspace msp, size_t n_elements,\r
- size_t elem_size, void* chunks[]) {\r
- size_t sz = elem_size; /* serves as 1-element array */\r
- mstate ms = (mstate)msp;\r
- if (!ok_magic(ms)) {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- return 0;\r
- }\r
- return ialloc(ms, n_elements, &sz, 3, chunks);\r
-}\r
-\r
-void** mspace_independent_comalloc(mspace msp, size_t n_elements,\r
- size_t sizes[], void* chunks[]) {\r
- mstate ms = (mstate)msp;\r
- if (!ok_magic(ms)) {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- return 0;\r
- }\r
- return ialloc(ms, n_elements, sizes, 0, chunks);\r
-}\r
-\r
-size_t mspace_bulk_free(mspace msp, void* array[], size_t nelem) {\r
- return internal_bulk_free((mstate)msp, array, nelem);\r
-}\r
-\r
-#if MALLOC_INSPECT_ALL\r
-void mspace_inspect_all(mspace msp,\r
- void(*handler)(void *start,\r
- void *end,\r
- size_t used_bytes,\r
- void* callback_arg),\r
- void* arg) {\r
- mstate ms = (mstate)msp;\r
- if (ok_magic(ms)) {\r
- if (!PREACTION(ms)) {\r
- internal_inspect_all(ms, handler, arg);\r
- POSTACTION(ms);\r
- }\r
- }\r
- else {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- }\r
-}\r
-#endif /* MALLOC_INSPECT_ALL */\r
-\r
-int mspace_trim(mspace msp, size_t pad) {\r
- int result = 0;\r
- mstate ms = (mstate)msp;\r
- if (ok_magic(ms)) {\r
- if (!PREACTION(ms)) {\r
- result = sys_trim(ms, pad);\r
- POSTACTION(ms);\r
- }\r
- }\r
- else {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- }\r
- return result;\r
-}\r
-\r
-#if !NO_MALLOC_STATS\r
-void mspace_malloc_stats(mspace msp) {\r
- mstate ms = (mstate)msp;\r
- if (ok_magic(ms)) {\r
- internal_malloc_stats(ms);\r
- }\r
- else {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- }\r
-}\r
-#endif /* NO_MALLOC_STATS */\r
-\r
-size_t mspace_footprint(mspace msp) {\r
- size_t result = 0;\r
- mstate ms = (mstate)msp;\r
- if (ok_magic(ms)) {\r
- result = ms->footprint;\r
- }\r
- else {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- }\r
- return result;\r
-}\r
-\r
-size_t mspace_max_footprint(mspace msp) {\r
- size_t result = 0;\r
- mstate ms = (mstate)msp;\r
- if (ok_magic(ms)) {\r
- result = ms->max_footprint;\r
- }\r
- else {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- }\r
- return result;\r
-}\r
-\r
-size_t mspace_footprint_limit(mspace msp) {\r
- size_t result = 0;\r
- mstate ms = (mstate)msp;\r
- if (ok_magic(ms)) {\r
- size_t maf = ms->footprint_limit;\r
- result = (maf == 0) ? MAX_SIZE_T : maf;\r
- }\r
- else {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- }\r
- return result;\r
-}\r
-\r
-size_t mspace_set_footprint_limit(mspace msp, size_t bytes) {\r
- size_t result = 0;\r
- mstate ms = (mstate)msp;\r
- if (ok_magic(ms)) {\r
- if (bytes == 0)\r
- result = granularity_align(1); /* Use minimal size */\r
- if (bytes == MAX_SIZE_T)\r
- result = 0; /* disable */\r
- else\r
- result = granularity_align(bytes);\r
- ms->footprint_limit = result;\r
- }\r
- else {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- }\r
- return result;\r
-}\r
-\r
-#if !NO_MALLINFO\r
-struct mallinfo mspace_mallinfo(mspace msp) {\r
- mstate ms = (mstate)msp;\r
- if (!ok_magic(ms)) {\r
- USAGE_ERROR_ACTION(ms,ms);\r
- }\r
- return internal_mallinfo(ms);\r
-}\r
-#endif /* NO_MALLINFO */\r
-\r
-size_t mspace_usable_size(void* mem) {\r
- if (mem != 0) {\r
- mchunkptr p = mem2chunk(mem);\r
- if (is_inuse(p))\r
- return chunksize(p) - overhead_for(p);\r
- }\r
- return 0;\r
-}\r
-\r
-int mspace_mallopt(int param_number, int value) {\r
- return change_mparam(param_number, value);\r
-}\r
-\r
-#endif /* MSPACES */\r
-\r
-\r
-/* -------------------- Alternative MORECORE functions ------------------- */\r
-\r
-/*\r
- Guidelines for creating a custom version of MORECORE:\r
-\r
- * For best performance, MORECORE should allocate in multiples of pagesize.\r
- * MORECORE may allocate more memory than requested. (Or even less,\r
- but this will usually result in a malloc failure.)\r
- * MORECORE must not allocate memory when given argument zero, but\r
- instead return one past the end address of memory from previous\r
- nonzero call.\r
- * For best performance, consecutive calls to MORECORE with positive\r
- arguments should return increasing addresses, indicating that\r
- space has been contiguously extended.\r
- * Even though consecutive calls to MORECORE need not return contiguous\r
- addresses, it must be OK for malloc'ed chunks to span multiple\r
- regions in those cases where they do happen to be contiguous.\r
- * MORECORE need not handle negative arguments -- it may instead\r
- just return MFAIL when given negative arguments.\r
- Negative arguments are always multiples of pagesize. MORECORE\r
- must not misinterpret negative args as large positive unsigned\r
- args. You can suppress all such calls from even occurring by defining\r
- MORECORE_CANNOT_TRIM,\r
-\r
- As an example alternative MORECORE, here is a custom allocator\r
- kindly contributed for pre-OSX macOS. It uses virtually but not\r
- necessarily physically contiguous non-paged memory (locked in,\r
- present and won't get swapped out). You can use it by uncommenting\r
- this section, adding some #includes, and setting up the appropriate\r
- defines above:\r
-\r
- #define MORECORE osMoreCore\r
-\r
- There is also a shutdown routine that should somehow be called for\r
- cleanup upon program exit.\r
-\r
- #define MAX_POOL_ENTRIES 100\r
- #define MINIMUM_MORECORE_SIZE (64 * 1024U)\r
- static int next_os_pool;\r
- void *our_os_pools[MAX_POOL_ENTRIES];\r
-\r
- void *osMoreCore(int size)\r
- {\r
- void *ptr = 0;\r
- static void *sbrk_top = 0;\r
-\r
- if (size > 0)\r
- {\r
- if (size < MINIMUM_MORECORE_SIZE)\r
- size = MINIMUM_MORECORE_SIZE;\r
- if (CurrentExecutionLevel() == kTaskLevel)\r
- ptr = PoolAllocateResident(size + RM_PAGE_SIZE, 0);\r
- if (ptr == 0)\r
- {\r
- return (void *) MFAIL;\r
- }\r
- // save ptrs so they can be freed during cleanup\r
- our_os_pools[next_os_pool] = ptr;\r
- next_os_pool++;\r
- ptr = (void *) ((((size_t) ptr) + RM_PAGE_MASK) & ~RM_PAGE_MASK);\r
- sbrk_top = (char *) ptr + size;\r
- return ptr;\r
- }\r
- else if (size < 0)\r
- {\r
- // we don't currently support shrink behavior\r
- return (void *) MFAIL;\r
- }\r
- else\r
- {\r
- return sbrk_top;\r
- }\r
- }\r
-\r
- // cleanup any allocated memory pools\r
- // called as last thing before shutting down driver\r
-\r
- void osCleanupMem(void)\r
- {\r
- void **ptr;\r
-\r
- for (ptr = our_os_pools; ptr < &our_os_pools[MAX_POOL_ENTRIES]; ptr++)\r
- if (*ptr)\r
- {\r
- PoolDeallocate(*ptr);\r
- *ptr = 0;\r
- }\r
- }\r
-\r
-*/\r
-\r
-\r
-/* -----------------------------------------------------------------------\r
-History:\r
- v2.8.5 Sun May 22 10:26:02 2011 Doug Lea (dl at gee)\r
- * Always perform unlink checks unless INSECURE\r
- * Add posix_memalign.\r
- * Improve realloc to expand in more cases; expose realloc_in_place.\r
- Thanks to Peter Buhr for the suggestion.\r
- * Add footprint_limit, inspect_all, bulk_free. Thanks\r
- to Barry Hayes and others for the suggestions.\r
- * Internal refactorings to avoid calls while holding locks\r
- * Use non-reentrant locks by default. Thanks to Roland McGrath\r
- for the suggestion.\r
- * Small fixes to mspace_destroy, reset_on_error.\r
- * Various configuration extensions/changes. Thanks\r
- to all who contributed these.\r
-\r
- V2.8.4a Thu Apr 28 14:39:43 2011 (dl at gee.cs.oswego.edu)\r
- * Update Creative Commons URL\r
-\r
- V2.8.4 Wed May 27 09:56:23 2009 Doug Lea (dl at gee)\r
- * Use zeros instead of prev foot for is_mmapped\r
- * Add mspace_track_large_chunks; thanks to Jean Brouwers\r
- * Fix set_inuse in internal_realloc; thanks to Jean Brouwers\r
- * Fix insufficient sys_alloc padding when using 16byte alignment\r
- * Fix bad error check in mspace_footprint\r
- * Adaptations for ptmalloc; thanks to Wolfram Gloger.\r
- * Reentrant spin locks; thanks to Earl Chew and others\r
- * Win32 improvements; thanks to Niall Douglas and Earl Chew\r
- * Add NO_SEGMENT_TRAVERSAL and MAX_RELEASE_CHECK_RATE options\r
- * Extension hook in malloc_state\r
- * Various small adjustments to reduce warnings on some compilers\r
- * Various configuration extensions/changes for more platforms. Thanks\r
- to all who contributed these.\r
-\r
- V2.8.3 Thu Sep 22 11:16:32 2005 Doug Lea (dl at gee)\r
- * Add max_footprint functions\r
- * Ensure all appropriate literals are size_t\r
- * Fix conditional compilation problem for some #define settings\r
- * Avoid concatenating segments with the one provided\r
- in create_mspace_with_base\r
- * Rename some variables to avoid compiler shadowing warnings\r
- * Use explicit lock initialization.\r
- * Better handling of sbrk interference.\r
- * Simplify and fix segment insertion, trimming and mspace_destroy\r
- * Reinstate REALLOC_ZERO_BYTES_FREES option from 2.7.x\r
- * Thanks especially to Dennis Flanagan for help on these.\r
-\r
- V2.8.2 Sun Jun 12 16:01:10 2005 Doug Lea (dl at gee)\r
- * Fix memalign brace error.\r
-\r
- V2.8.1 Wed Jun 8 16:11:46 2005 Doug Lea (dl at gee)\r
- * Fix improper #endif nesting in C++\r
- * Add explicit casts needed for C++\r
-\r
- V2.8.0 Mon May 30 14:09:02 2005 Doug Lea (dl at gee)\r
- * Use trees for large bins\r
- * Support mspaces\r
- * Use segments to unify sbrk-based and mmap-based system allocation,\r
- removing need for emulation on most platforms without sbrk.\r
- * Default safety checks\r
- * Optional footer checks. Thanks to William Robertson for the idea.\r
- * Internal code refactoring\r
- * Incorporate suggestions and platform-specific changes.\r
- Thanks to Dennis Flanagan, Colin Plumb, Niall Douglas,\r
- Aaron Bachmann, Emery Berger, and others.\r
- * Speed up non-fastbin processing enough to remove fastbins.\r
- * Remove useless cfree() to avoid conflicts with other apps.\r
- * Remove internal memcpy, memset. Compilers handle builtins better.\r
- * Remove some options that no one ever used and rename others.\r
-\r
- V2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)\r
- * Fix malloc_state bitmap array misdeclaration\r
-\r
- V2.7.1 Thu Jul 25 10:58:03 2002 Doug Lea (dl at gee)\r
- * Allow tuning of FIRST_SORTED_BIN_SIZE\r
- * Use PTR_UINT as type for all ptr->int casts. Thanks to John Belmonte.\r
- * Better detection and support for non-contiguousness of MORECORE.\r
- Thanks to Andreas Mueller, Conal Walsh, and Wolfram Gloger\r
- * Bypass most of malloc if no frees. Thanks To Emery Berger.\r
- * Fix freeing of old top non-contiguous chunk im sysmalloc.\r
- * Raised default trim and map thresholds to 256K.\r
- * Fix mmap-related #defines. Thanks to Lubos Lunak.\r
- * Fix copy macros; added LACKS_FCNTL_H. Thanks to Neal Walfield.\r
- * Branch-free bin calculation\r
- * Default trim and mmap thresholds now 256K.\r
-\r
- V2.7.0 Sun Mar 11 14:14:06 2001 Doug Lea (dl at gee)\r
- * Introduce independent_comalloc and independent_calloc.\r
- Thanks to Michael Pachos for motivation and help.\r
- * Make optional .h file available\r
- * Allow > 2GB requests on 32bit systems.\r
- * new WIN32 sbrk, mmap, munmap, lock code from <Walter@GeNeSys-e.de>.\r
- Thanks also to Andreas Mueller <a.mueller at paradatec.de>,\r
- and Anonymous.\r
- * Allow override of MALLOC_ALIGNMENT (Thanks to Ruud Waij for\r
- helping test this.)\r
- * memalign: check alignment arg\r
- * realloc: don't try to shift chunks backwards, since this\r
- leads to more fragmentation in some programs and doesn't\r
- seem to help in any others.\r
- * Collect all cases in malloc requiring system memory into sysmalloc\r
- * Use mmap as backup to sbrk\r
- * Place all internal state in malloc_state\r
- * Introduce fastbins (although similar to 2.5.1)\r
- * Many minor tunings and cosmetic improvements\r
- * Introduce USE_PUBLIC_MALLOC_WRAPPERS, USE_MALLOC_LOCK\r
- * Introduce MALLOC_FAILURE_ACTION, MORECORE_CONTIGUOUS\r
- Thanks to Tony E. Bennett <tbennett@nvidia.com> and others.\r
- * Include errno.h to support default failure action.\r
-\r
- V2.6.6 Sun Dec 5 07:42:19 1999 Doug Lea (dl at gee)\r
- * return null for negative arguments\r
- * Added Several WIN32 cleanups from Martin C. Fong <mcfong at yahoo.com>\r
- * Add 'LACKS_SYS_PARAM_H' for those systems without 'sys/param.h'\r
- (e.g. WIN32 platforms)\r
- * Cleanup header file inclusion for WIN32 platforms\r
- * Cleanup code to avoid Microsoft Visual C++ compiler complaints\r
- * Add 'USE_DL_PREFIX' to quickly allow co-existence with existing\r
- memory allocation routines\r
- * Set 'malloc_getpagesize' for WIN32 platforms (needs more work)\r
- * Use 'assert' rather than 'ASSERT' in WIN32 code to conform to\r
- usage of 'assert' in non-WIN32 code\r
- * Improve WIN32 'sbrk()' emulation's 'findRegion()' routine to\r
- avoid infinite loop\r
- * Always call 'fREe()' rather than 'free()'\r
-\r
- V2.6.5 Wed Jun 17 15:57:31 1998 Doug Lea (dl at gee)\r
- * Fixed ordering problem with boundary-stamping\r
-\r
- V2.6.3 Sun May 19 08:17:58 1996 Doug Lea (dl at gee)\r
- * Added pvalloc, as recommended by H.J. Liu\r
- * Added 64bit pointer support mainly from Wolfram Gloger\r
- * Added anonymously donated WIN32 sbrk emulation\r
- * Malloc, calloc, getpagesize: add optimizations from Raymond Nijssen\r
- * malloc_extend_top: fix mask error that caused wastage after\r
- foreign sbrks\r
- * Add linux mremap support code from HJ Liu\r
-\r
- V2.6.2 Tue Dec 5 06:52:55 1995 Doug Lea (dl at gee)\r
- * Integrated most documentation with the code.\r
- * Add support for mmap, with help from\r
- Wolfram Gloger (Gloger@lrz.uni-muenchen.de).\r
- * Use last_remainder in more cases.\r
- * Pack bins using idea from colin@nyx10.cs.du.edu\r
- * Use ordered bins instead of best-fit threshhold\r
- * Eliminate block-local decls to simplify tracing and debugging.\r
- * Support another case of realloc via move into top\r
- * Fix error occuring when initial sbrk_base not word-aligned.\r
- * Rely on page size for units instead of SBRK_UNIT to\r
- avoid surprises about sbrk alignment conventions.\r
- * Add mallinfo, mallopt. Thanks to Raymond Nijssen\r
- (raymond@es.ele.tue.nl) for the suggestion.\r
- * Add `pad' argument to malloc_trim and top_pad mallopt parameter.\r
- * More precautions for cases where other routines call sbrk,\r
- courtesy of Wolfram Gloger (Gloger@lrz.uni-muenchen.de).\r
- * Added macros etc., allowing use in linux libc from\r
- H.J. Lu (hjl@gnu.ai.mit.edu)\r
- * Inverted this history list\r
-\r
- V2.6.1 Sat Dec 2 14:10:57 1995 Doug Lea (dl at gee)\r
- * Re-tuned and fixed to behave more nicely with V2.6.0 changes.\r
- * Removed all preallocation code since under current scheme\r
- the work required to undo bad preallocations exceeds\r
- the work saved in good cases for most test programs.\r
- * No longer use return list or unconsolidated bins since\r
- no scheme using them consistently outperforms those that don't\r
- given above changes.\r
- * Use best fit for very large chunks to prevent some worst-cases.\r
- * Added some support for debugging\r
-\r
- V2.6.0 Sat Nov 4 07:05:23 1995 Doug Lea (dl at gee)\r
- * Removed footers when chunks are in use. Thanks to\r
- Paul Wilson (wilson@cs.texas.edu) for the suggestion.\r
-\r
- V2.5.4 Wed Nov 1 07:54:51 1995 Doug Lea (dl at gee)\r
- * Added malloc_trim, with help from Wolfram Gloger\r
- (wmglo@Dent.MED.Uni-Muenchen.DE).\r
-\r
- V2.5.3 Tue Apr 26 10:16:01 1994 Doug Lea (dl at g)\r
-\r
- V2.5.2 Tue Apr 5 16:20:40 1994 Doug Lea (dl at g)\r
- * realloc: try to expand in both directions\r
- * malloc: swap order of clean-bin strategy;\r
- * realloc: only conditionally expand backwards\r
- * Try not to scavenge used bins\r
- * Use bin counts as a guide to preallocation\r
- * Occasionally bin return list chunks in first scan\r
- * Add a few optimizations from colin@nyx10.cs.du.edu\r
-\r
- V2.5.1 Sat Aug 14 15:40:43 1993 Doug Lea (dl at g)\r
- * faster bin computation & slightly different binning\r
- * merged all consolidations to one part of malloc proper\r
- (eliminating old malloc_find_space & malloc_clean_bin)\r
- * Scan 2 returns chunks (not just 1)\r
- * Propagate failure in realloc if malloc returns 0\r
- * Add stuff to allow compilation on non-ANSI compilers\r
- from kpv@research.att.com\r
-\r
- V2.5 Sat Aug 7 07:41:59 1993 Doug Lea (dl at g.oswego.edu)\r
- * removed potential for odd address access in prev_chunk\r
- * removed dependency on getpagesize.h\r
- * misc cosmetics and a bit more internal documentation\r
- * anticosmetics: mangled names in macros to evade debugger strangeness\r
- * tested on sparc, hp-700, dec-mips, rs6000\r
- with gcc & native cc (hp, dec only) allowing\r
- Detlefs & Zorn comparison study (in SIGPLAN Notices.)\r
-\r
- Trial version Fri Aug 28 13:14:29 1992 Doug Lea (dl at g.oswego.edu)\r
- * Based loosely on libg++-1.2X malloc. (It retains some of the overall\r
- structure of old version, but most details differ.)\r
-\r
-*/\r
-#endif\r
-\r
-#ifdef TEST\r
-#include "_PDCLIB_test.h"\r
-\r
-/* TODO: TEST ME */\r
-int main( void )\r
-{\r
- return TEST_RESULTS;\r
-}\r
-\r
-#endif\r
+/*
+ This is a version (aka dlmalloc) of malloc/free/realloc written by
+ Doug Lea and released to the public domain, as explained at
+ http://creativecommons.org/publicdomain/zero/1.0/ Send questions,
+ comments, complaints, performance data, etc to dl@cs.oswego.edu
+
+* Version 2.8.5 Sun May 22 10:26:02 2011 Doug Lea (dl at gee)
+
+ Note: There may be an updated version of this malloc obtainable at
+ ftp://gee.cs.oswego.edu/pub/misc/malloc.c
+ Check before installing!
+
+* Quickstart
+
+ This library is all in one file to simplify the most common usage:
+ ftp it, compile it (-O3), and link it into another program. All of
+ the compile-time options default to reasonable values for use on
+ most platforms. You might later want to step through various
+ compile-time and dynamic tuning options.
+
+ For convenience, an include file for code using this malloc is at:
+ ftp://gee.cs.oswego.edu/pub/misc/malloc-2.8.5.h
+ You don't really need this .h file unless you call functions not
+ defined in your system include files. The .h file contains only the
+ excerpts from this file needed for using this malloc on ANSI C/C++
+ systems, so long as you haven't changed compile-time options about
+ naming and tuning parameters. If you do, then you can create your
+ own malloc.h that does include all settings by cutting at the point
+ indicated below. Note that you may already by default be using a C
+ library containing a malloc that is based on some version of this
+ malloc (for example in linux). You might still want to use the one
+ in this file to customize settings or to avoid overheads associated
+ with library versions.
+
+* Vital statistics:
+
+ Supported pointer/size_t representation: 4 or 8 bytes
+ size_t MUST be an unsigned type of the same width as
+ pointers. (If you are using an ancient system that declares
+ size_t as a signed type, or need it to be a different width
+ than pointers, you can use a previous release of this malloc
+ (e.g. 2.7.2) supporting these.)
+
+ Alignment: 8 bytes (default)
+ This suffices for nearly all current machines and C compilers.
+ However, you can define MALLOC_ALIGNMENT to be wider than this
+ if necessary (up to 128bytes), at the expense of using more space.
+
+ Minimum overhead per allocated chunk: 4 or 8 bytes (if 4byte sizes)
+ 8 or 16 bytes (if 8byte sizes)
+ Each malloced chunk has a hidden word of overhead holding size
+ and status information, and additional cross-check word
+ if FOOTERS is defined.
+
+ Minimum allocated size: 4-byte ptrs: 16 bytes (including overhead)
+ 8-byte ptrs: 32 bytes (including overhead)
+
+ Even a request for zero bytes (i.e., malloc(0)) returns a
+ pointer to something of the minimum allocatable size.
+ The maximum overhead wastage (i.e., number of extra bytes
+ allocated than were requested in malloc) is less than or equal
+ to the minimum size, except for requests >= mmap_threshold that
+ are serviced via mmap(), where the worst case wastage is about
+ 32 bytes plus the remainder from a system page (the minimal
+ mmap unit); typically 4096 or 8192 bytes.
+
+ Security: static-safe; optionally more or less
+ The "security" of malloc refers to the ability of malicious
+ code to accentuate the effects of errors (for example, freeing
+ space that is not currently malloc'ed or overwriting past the
+ ends of chunks) in code that calls malloc. This malloc
+ guarantees not to modify any memory locations below the base of
+ heap, i.e., static variables, even in the presence of usage
+ errors. The routines additionally detect most improper frees
+ and reallocs. All this holds as long as the static bookkeeping
+ for malloc itself is not corrupted by some other means. This
+ is only one aspect of security -- these checks do not, and
+ cannot, detect all possible programming errors.
+
+ If FOOTERS is defined nonzero, then each allocated chunk
+ carries an additional check word to verify that it was malloced
+ from its space. These check words are the same within each
+ execution of a program using malloc, but differ across
+ executions, so externally crafted fake chunks cannot be
+ freed. This improves security by rejecting frees/reallocs that
+ could corrupt heap memory, in addition to the checks preventing
+ writes to statics that are always on. This may further improve
+ security at the expense of time and space overhead. (Note that
+ FOOTERS may also be worth using with MSPACES.)
+
+ By default detected errors cause the program to abort (calling
+ "abort()"). You can override this to instead proceed past
+ errors by defining PROCEED_ON_ERROR. In this case, a bad free
+ has no effect, and a malloc that encounters a bad address
+ caused by user overwrites will ignore the bad address by
+ dropping pointers and indices to all known memory. This may
+ be appropriate for programs that should continue if at all
+ possible in the face of programming errors, although they may
+ run out of memory because dropped memory is never reclaimed.
+
+ If you don't like either of these options, you can define
+ CORRUPTION_ERROR_ACTION and USAGE_ERROR_ACTION to do anything
+ else. And if if you are sure that your program using malloc has
+ no errors or vulnerabilities, you can define INSECURE to 1,
+ which might (or might not) provide a small performance improvement.
+
+ It is also possible to limit the maximum total allocatable
+ space, using malloc_set_footprint_limit. This is not
+ designed as a security feature in itself (calls to set limits
+ are not screened or privileged), but may be useful as one
+ aspect of a secure implementation.
+
+ Thread-safety: NOT thread-safe unless USE_LOCKS defined non-zero
+ When USE_LOCKS is defined, each public call to malloc, free,
+ etc is surrounded with a lock. By default, this uses a plain
+ pthread mutex, win32 critical section, or a spin-lock if if
+ available for the platform and not disabled by setting
+ USE_SPIN_LOCKS=0. However, if USE_RECURSIVE_LOCKS is defined,
+ recursive versions are used instead (which are not required for
+ base functionality but may be needed in layered extensions).
+ Using a global lock is not especially fast, and can be a major
+ bottleneck. It is designed only to provide minimal protection
+ in concurrent environments, and to provide a basis for
+ extensions. If you are using malloc in a concurrent program,
+ consider instead using nedmalloc
+ (http://www.nedprod.com/programs/portable/nedmalloc/) or
+ ptmalloc (See http://www.malloc.de), which are derived from
+ versions of this malloc.
+
+ System requirements: Any combination of MORECORE and/or MMAP/MUNMAP
+ This malloc can use unix sbrk or any emulation (invoked using
+ the CALL_MORECORE macro) and/or mmap/munmap or any emulation
+ (invoked using CALL_MMAP/CALL_MUNMAP) to get and release system
+ memory. On most unix systems, it tends to work best if both
+ MORECORE and MMAP are enabled. On Win32, it uses emulations
+ based on VirtualAlloc. It also uses common C library functions
+ like memset.
+
+ Compliance: I believe it is compliant with the Single Unix Specification
+ (See http://www.unix.org). Also SVID/XPG, ANSI C, and probably
+ others as well.
+
+* Overview of algorithms
+
+ This is not the fastest, most space-conserving, most portable, or
+ most tunable malloc ever written. However it is among the fastest
+ while also being among the most space-conserving, portable and
+ tunable. Consistent balance across these factors results in a good
+ general-purpose allocator for malloc-intensive programs.
+
+ In most ways, this malloc is a best-fit allocator. Generally, it
+ chooses the best-fitting existing chunk for a request, with ties
+ broken in approximately least-recently-used order. (This strategy
+ normally maintains low fragmentation.) However, for requests less
+ than 256bytes, it deviates from best-fit when there is not an
+ exactly fitting available chunk by preferring to use space adjacent
+ to that used for the previous small request, as well as by breaking
+ ties in approximately most-recently-used order. (These enhance
+ locality of series of small allocations.) And for very large requests
+ (>= 256Kb by default), it relies on system memory mapping
+ facilities, if supported. (This helps avoid carrying around and
+ possibly fragmenting memory used only for large chunks.)
+
+ All operations (except malloc_stats and mallinfo) have execution
+ times that are bounded by a constant factor of the number of bits in
+ a size_t, not counting any clearing in calloc or copying in realloc,
+ or actions surrounding MORECORE and MMAP that have times
+ proportional to the number of non-contiguous regions returned by
+ system allocation routines, which is often just 1. In real-time
+ applications, you can optionally suppress segment traversals using
+ NO_SEGMENT_TRAVERSAL, which assures bounded execution even when
+ system allocators return non-contiguous spaces, at the typical
+ expense of carrying around more memory and increased fragmentation.
+
+ The implementation is not very modular and seriously overuses
+ macros. Perhaps someday all C compilers will do as good a job
+ inlining modular code as can now be done by brute-force expansion,
+ but now, enough of them seem not to.
+
+ Some compilers issue a lot of warnings about code that is
+ dead/unreachable only on some platforms, and also about intentional
+ uses of negation on unsigned types. All known cases of each can be
+ ignored.
+
+ For a longer but out of date high-level description, see
+ http://gee.cs.oswego.edu/dl/html/malloc.html
+
+* MSPACES
+ If MSPACES is defined, then in addition to malloc, free, etc.,
+ this file also defines mspace_malloc, mspace_free, etc. These
+ are versions of malloc routines that take an "mspace" argument
+ obtained using create_mspace, to control all internal bookkeeping.
+ If ONLY_MSPACES is defined, only these versions are compiled.
+ So if you would like to use this allocator for only some allocations,
+ and your system malloc for others, you can compile with
+ ONLY_MSPACES and then do something like...
+ static mspace mymspace = create_mspace(0,0); // for example
+ #define mymalloc(bytes) mspace_malloc(mymspace, bytes)
+
+ (Note: If you only need one instance of an mspace, you can instead
+ use "USE_DL_PREFIX" to relabel the global malloc.)
+
+ You can similarly create thread-local allocators by storing
+ mspaces as thread-locals. For example:
+ static __thread mspace tlms = 0;
+ void* tlmalloc(size_t bytes) {
+ if (tlms == 0) tlms = create_mspace(0, 0);
+ return mspace_malloc(tlms, bytes);
+ }
+ void tlfree(void* mem) { mspace_free(tlms, mem); }
+
+ Unless FOOTERS is defined, each mspace is completely independent.
+ You cannot allocate from one and free to another (although
+ conformance is only weakly checked, so usage errors are not always
+ caught). If FOOTERS is defined, then each chunk carries around a tag
+ indicating its originating mspace, and frees are directed to their
+ originating spaces. Normally, this requires use of locks.
+
+ ------------------------- Compile-time options ---------------------------
+
+Be careful in setting #define values for numerical constants of type
+size_t. On some systems, literal values are not automatically extended
+to size_t precision unless they are explicitly casted. You can also
+use the symbolic values MAX_SIZE_T, SIZE_T_ONE, etc below.
+
+WIN32 default: defined if _WIN32 defined
+ Defining WIN32 sets up defaults for MS environment and compilers.
+ Otherwise defaults are for unix. Beware that there seem to be some
+ cases where this malloc might not be a pure drop-in replacement for
+ Win32 malloc: Random-looking failures from Win32 GDI API's (eg;
+ SetDIBits()) may be due to bugs in some video driver implementations
+ when pixel buffers are malloc()ed, and the region spans more than
+ one VirtualAlloc()ed region. Because dlmalloc uses a small (64Kb)
+ default granularity, pixel buffers may straddle virtual allocation
+ regions more often than when using the Microsoft allocator. You can
+ avoid this by using VirtualAlloc() and VirtualFree() for all pixel
+ buffers rather than using malloc(). If this is not possible,
+ recompile this malloc with a larger DEFAULT_GRANULARITY. Note:
+ in cases where MSC and gcc (cygwin) are known to differ on WIN32,
+ conditions use _MSC_VER to distinguish them.
+
+DLMALLOC_EXPORT default: extern
+ Defines how public APIs are declared. If you want to export via a
+ Windows DLL, you might define this as
+ #define DLMALLOC_EXPORT extern __declspace(dllexport)
+ If you want a POSIX ELF shared object, you might use
+ #define DLMALLOC_EXPORT extern __attribute__((visibility("default")))
+
+MALLOC_ALIGNMENT default: (size_t)8
+ Controls the minimum alignment for malloc'ed chunks. It must be a
+ power of two and at least 8, even on machines for which smaller
+ alignments would suffice. It may be defined as larger than this
+ though. Note however that code and data structures are optimized for
+ the case of 8-byte alignment.
+
+MSPACES default: 0 (false)
+ If true, compile in support for independent allocation spaces.
+ This is only supported if HAVE_MMAP is true.
+
+ONLY_MSPACES default: 0 (false)
+ If true, only compile in mspace versions, not regular versions.
+
+USE_LOCKS default: 0 (false)
+ Causes each call to each public routine to be surrounded with
+ pthread or WIN32 mutex lock/unlock. (If set true, this can be
+ overridden on a per-mspace basis for mspace versions.) If set to a
+ non-zero value other than 1, locks are used, but their
+ implementation is left out, so lock functions must be supplied manually,
+ as described below.
+
+USE_SPIN_LOCKS default: 1 iff USE_LOCKS and spin locks available
+ If true, uses custom spin locks for locking. This is currently
+ supported only gcc >= 4.1, older gccs on x86 platforms, and recent
+ MS compilers. Otherwise, posix locks or win32 critical sections are
+ used.
+
+USE_RECURSIVE_LOCKS default: not defined
+ If defined nonzero, uses recursive (aka reentrant) locks, otherwise
+ uses plain mutexes. This is not required for malloc proper, but may
+ be needed for layered allocators such as nedmalloc.
+
+FOOTERS default: 0
+ If true, provide extra checking and dispatching by placing
+ information in the footers of allocated chunks. This adds
+ space and time overhead.
+
+INSECURE default: 0
+ If true, omit checks for usage errors and heap space overwrites.
+
+USE_DL_PREFIX default: NOT defined
+ Causes compiler to prefix all public routines with the string 'dl'.
+ This can be useful when you only want to use this malloc in one part
+ of a program, using your regular system malloc elsewhere.
+
+MALLOC_INSPECT_ALL default: NOT defined
+ If defined, compiles malloc_inspect_all and mspace_inspect_all, that
+ perform traversal of all heap space. Unless access to these
+ functions is otherwise restricted, you probably do not want to
+ include them in secure implementations.
+
+ABORT default: defined as abort()
+ Defines how to abort on failed checks. On most systems, a failed
+ check cannot die with an "assert" or even print an informative
+ message, because the underlying print routines in turn call malloc,
+ which will fail again. Generally, the best policy is to simply call
+ abort(). It's not very useful to do more than this because many
+ errors due to overwriting will show up as address faults (null, odd
+ addresses etc) rather than malloc-triggered checks, so will also
+ abort. Also, most compilers know that abort() does not return, so
+ can better optimize code conditionally calling it.
+
+PROCEED_ON_ERROR default: defined as 0 (false)
+ Controls whether detected bad addresses cause them to bypassed
+ rather than aborting. If set, detected bad arguments to free and
+ realloc are ignored. And all bookkeeping information is zeroed out
+ upon a detected overwrite of freed heap space, thus losing the
+ ability to ever return it from malloc again, but enabling the
+ application to proceed. If PROCEED_ON_ERROR is defined, the
+ static variable malloc_corruption_error_count is compiled in
+ and can be examined to see if errors have occurred. This option
+ generates slower code than the default abort policy.
+
+DEBUG default: NOT defined
+ The DEBUG setting is mainly intended for people trying to modify
+ this code or diagnose problems when porting to new platforms.
+ However, it may also be able to better isolate user errors than just
+ using runtime checks. The assertions in the check routines spell
+ out in more detail the assumptions and invariants underlying the
+ algorithms. The checking is fairly extensive, and will slow down
+ execution noticeably. Calling malloc_stats or mallinfo with DEBUG
+ set will attempt to check every non-mmapped allocated and free chunk
+ in the course of computing the summaries.
+
+ABORT_ON_ASSERT_FAILURE default: defined as 1 (true)
+ Debugging assertion failures can be nearly impossible if your
+ version of the assert macro causes malloc to be called, which will
+ lead to a cascade of further failures, blowing the runtime stack.
+ ABORT_ON_ASSERT_FAILURE cause assertions failures to call abort(),
+ which will usually make debugging easier.
+
+MALLOC_FAILURE_ACTION default: sets errno to ENOMEM, or no-op on win32
+ The action to take before "return 0" when malloc fails to be able to
+ return memory because there is none available.
+
+HAVE_MORECORE default: 1 (true) unless win32 or ONLY_MSPACES
+ True if this system supports sbrk or an emulation of it.
+
+MORECORE default: sbrk
+ The name of the sbrk-style system routine to call to obtain more
+ memory. See below for guidance on writing custom MORECORE
+ functions. The type of the argument to sbrk/MORECORE varies across
+ systems. It cannot be size_t, because it supports negative
+ arguments, so it is normally the signed type of the same width as
+ size_t (sometimes declared as "intptr_t"). It doesn't much matter
+ though. Internally, we only call it with arguments less than half
+ the max value of a size_t, which should work across all reasonable
+ possibilities, although sometimes generating compiler warnings.
+
+MORECORE_CONTIGUOUS default: 1 (true) if HAVE_MORECORE
+ If true, take advantage of fact that consecutive calls to MORECORE
+ with positive arguments always return contiguous increasing
+ addresses. This is true of unix sbrk. It does not hurt too much to
+ set it true anyway, since malloc copes with non-contiguities.
+ Setting it false when definitely non-contiguous saves time
+ and possibly wasted space it would take to discover this though.
+
+MORECORE_CANNOT_TRIM default: NOT defined
+ True if MORECORE cannot release space back to the system when given
+ negative arguments. This is generally necessary only if you are
+ using a hand-crafted MORECORE function that cannot handle negative
+ arguments.
+
+NO_SEGMENT_TRAVERSAL default: 0
+ If non-zero, suppresses traversals of memory segments
+ returned by either MORECORE or CALL_MMAP. This disables
+ merging of segments that are contiguous, and selectively
+ releasing them to the OS if unused, but bounds execution times.
+
+HAVE_MMAP default: 1 (true)
+ True if this system supports mmap or an emulation of it. If so, and
+ HAVE_MORECORE is not true, MMAP is used for all system
+ allocation. If set and HAVE_MORECORE is true as well, MMAP is
+ primarily used to directly allocate very large blocks. It is also
+ used as a backup strategy in cases where MORECORE fails to provide
+ space from system. Note: A single call to MUNMAP is assumed to be
+ able to unmap memory that may have be allocated using multiple calls
+ to MMAP, so long as they are adjacent.
+
+HAVE_MREMAP default: 1 on linux, else 0
+ If true realloc() uses mremap() to re-allocate large blocks and
+ extend or shrink allocation spaces.
+
+MMAP_CLEARS default: 1 except on WINCE.
+ True if mmap clears memory so calloc doesn't need to. This is true
+ for standard unix mmap using /dev/zero and on WIN32 except for WINCE.
+
+USE_BUILTIN_FFS default: 0 (i.e., not used)
+ Causes malloc to use the builtin ffs() function to compute indices.
+ Some compilers may recognize and intrinsify ffs to be faster than the
+ supplied C version. Also, the case of x86 using gcc is special-cased
+ to an asm instruction, so is already as fast as it can be, and so
+ this setting has no effect. Similarly for Win32 under recent MS compilers.
+ (On most x86s, the asm version is only slightly faster than the C version.)
+
+malloc_getpagesize default: derive from system includes, or 4096.
+ The system page size. To the extent possible, this malloc manages
+ memory from the system in page-size units. This may be (and
+ usually is) a function rather than a constant. This is ignored
+ if WIN32, where page size is determined using getSystemInfo during
+ initialization.
+
+USE_DEV_RANDOM default: 0 (i.e., not used)
+ Causes malloc to use /dev/random to initialize secure magic seed for
+ stamping footers. Otherwise, the current time is used.
+
+NO_MALLINFO default: 0
+ If defined, don't compile "mallinfo". This can be a simple way
+ of dealing with mismatches between system declarations and
+ those in this file.
+
+MALLINFO_FIELD_TYPE default: size_t
+ The type of the fields in the mallinfo struct. This was originally
+ defined as "int" in SVID etc, but is more usefully defined as
+ size_t. The value is used only if HAVE_USR_INCLUDE_MALLOC_H is not set
+
+NO_MALLOC_STATS default: 0
+ If defined, don't compile "malloc_stats". This avoids calls to
+ fprintf and bringing in stdio dependencies you might not want.
+
+REALLOC_ZERO_BYTES_FREES default: not defined
+ This should be set if a call to realloc with zero bytes should
+ be the same as a call to free. Some people think it should. Otherwise,
+ since this malloc returns a unique pointer for malloc(0), so does
+ realloc(p, 0).
+
+LACKS_UNISTD_H, LACKS_FCNTL_H, LACKS_SYS_PARAM_H, LACKS_SYS_MMAN_H
+LACKS_STRINGS_H, LACKS_STRING_H, LACKS_SYS_TYPES_H, LACKS_ERRNO_H
+LACKS_STDLIB_H LACKS_SCHED_H LACKS_TIME_H default: NOT defined unless on WIN32
+ Define these if your system does not have these header files.
+ You might need to manually insert some of the declarations they provide.
+
+DEFAULT_GRANULARITY default: page size if MORECORE_CONTIGUOUS,
+ system_info.dwAllocationGranularity in WIN32,
+ otherwise 64K.
+ Also settable using mallopt(M_GRANULARITY, x)
+ The unit for allocating and deallocating memory from the system. On
+ most systems with contiguous MORECORE, there is no reason to
+ make this more than a page. However, systems with MMAP tend to
+ either require or encourage larger granularities. You can increase
+ this value to prevent system allocation functions to be called so
+ often, especially if they are slow. The value must be at least one
+ page and must be a power of two. Setting to 0 causes initialization
+ to either page size or win32 region size. (Note: In previous
+ versions of malloc, the equivalent of this option was called
+ "TOP_PAD")
+
+DEFAULT_TRIM_THRESHOLD default: 2MB
+ Also settable using mallopt(M_TRIM_THRESHOLD, x)
+ The maximum amount of unused top-most memory to keep before
+ releasing via malloc_trim in free(). Automatic trimming is mainly
+ useful in long-lived programs using contiguous MORECORE. Because
+ trimming via sbrk can be slow on some systems, and can sometimes be
+ wasteful (in cases where programs immediately afterward allocate
+ more large chunks) the value should be high enough so that your
+ overall system performance would improve by releasing this much
+ memory. As a rough guide, you might set to a value close to the
+ average size of a process (program) running on your system.
+ Releasing this much memory would allow such a process to run in
+ memory. Generally, it is worth tuning trim thresholds when a
+ program undergoes phases where several large chunks are allocated
+ and released in ways that can reuse each other's storage, perhaps
+ mixed with phases where there are no such chunks at all. The trim
+ value must be greater than page size to have any useful effect. To
+ disable trimming completely, you can set to MAX_SIZE_T. Note that the trick
+ some people use of mallocing a huge space and then freeing it at
+ program startup, in an attempt to reserve system memory, doesn't
+ have the intended effect under automatic trimming, since that memory
+ will immediately be returned to the system.
+
+DEFAULT_MMAP_THRESHOLD default: 256K
+ Also settable using mallopt(M_MMAP_THRESHOLD, x)
+ The request size threshold for using MMAP to directly service a
+ request. Requests of at least this size that cannot be allocated
+ using already-existing space will be serviced via mmap. (If enough
+ normal freed space already exists it is used instead.) Using mmap
+ segregates relatively large chunks of memory so that they can be
+ individually obtained and released from the host system. A request
+ serviced through mmap is never reused by any other request (at least
+ not directly; the system may just so happen to remap successive
+ requests to the same locations). Segregating space in this way has
+ the benefits that: Mmapped space can always be individually released
+ back to the system, which helps keep the system level memory demands
+ of a long-lived program low. Also, mapped memory doesn't become
+ `locked' between other chunks, as can happen with normally allocated
+ chunks, which means that even trimming via malloc_trim would not
+ release them. However, it has the disadvantage that the space
+ cannot be reclaimed, consolidated, and then used to service later
+ requests, as happens with normal chunks. The advantages of mmap
+ nearly always outweigh disadvantages for "large" chunks, but the
+ value of "large" may vary across systems. The default is an
+ empirically derived value that works well in most systems. You can
+ disable mmap by setting to MAX_SIZE_T.
+
+MAX_RELEASE_CHECK_RATE default: 4095 unless not HAVE_MMAP
+ The number of consolidated frees between checks to release
+ unused segments when freeing. When using non-contiguous segments,
+ especially with multiple mspaces, checking only for topmost space
+ doesn't always suffice to trigger trimming. To compensate for this,
+ free() will, with a period of MAX_RELEASE_CHECK_RATE (or the
+ current number of segments, if greater) try to release unused
+ segments to the OS when freeing chunks that result in
+ consolidation. The best value for this parameter is a compromise
+ between slowing down frees with relatively costly checks that
+ rarely trigger versus holding on to unused memory. To effectively
+ disable, set to MAX_SIZE_T. This may lead to a very slight speed
+ improvement at the expense of carrying around more memory.
+*/
+
+#ifndef REGTEST
+#include "dlmalloc.h"
+
+/* Version identifier to allow people to support multiple versions */
+#ifndef DLMALLOC_VERSION
+#define DLMALLOC_VERSION 20805
+#endif /* DLMALLOC_VERSION */
+
+#ifndef DLMALLOC_EXPORT
+#define DLMALLOC_EXPORT extern
+#endif
+
+#ifndef WIN32
+#ifdef _WIN32
+#define WIN32 1
+#endif /* _WIN32 */
+#ifdef _WIN32_WCE
+#define LACKS_FCNTL_H
+#define WIN32 1
+#endif /* _WIN32_WCE */
+#endif /* WIN32 */
+#ifdef WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <tchar.h>
+#define HAVE_MMAP 1
+#define HAVE_MORECORE 0
+#define LACKS_UNISTD_H
+#define LACKS_SYS_PARAM_H
+#define LACKS_SYS_MMAN_H
+#define LACKS_STRING_H
+#define LACKS_STRINGS_H
+#define LACKS_SYS_TYPES_H
+#define LACKS_ERRNO_H
+#define LACKS_SCHED_H
+#ifndef MALLOC_FAILURE_ACTION
+#define MALLOC_FAILURE_ACTION
+#endif /* MALLOC_FAILURE_ACTION */
+#ifndef MMAP_CLEARS
+#ifdef _WIN32_WCE /* WINCE reportedly does not clear */
+#define MMAP_CLEARS 0
+#else
+#define MMAP_CLEARS 1
+#endif /* _WIN32_WCE */
+#endif /*MMAP_CLEARS */
+#endif /* WIN32 */
+
+#if defined(DARWIN) || defined(_DARWIN)
+/* Mac OSX docs advise not to use sbrk; it seems better to use mmap */
+#ifndef HAVE_MORECORE
+#define HAVE_MORECORE 0
+#define HAVE_MMAP 1
+/* OSX allocators provide 16 byte alignment */
+#ifndef MALLOC_ALIGNMENT
+#define MALLOC_ALIGNMENT ((size_t)16U)
+#endif
+#endif /* HAVE_MORECORE */
+#endif /* DARWIN */
+
+#ifndef LACKS_SYS_TYPES_H
+#include <sys/types.h> /* For size_t */
+#endif /* LACKS_SYS_TYPES_H */
+
+/* The maximum possible size_t value has all bits set */
+#define MAX_SIZE_T (~(size_t)0)
+
+#ifndef USE_LOCKS /* ensure true if spin or recursive locks set */
+#define USE_LOCKS ((defined(USE_SPIN_LOCKS) && USE_SPIN_LOCKS != 0) || \
+ (defined(USE_RECURSIVE_LOCKS) && USE_RECURSIVE_LOCKS != 0))
+#endif /* USE_LOCKS */
+
+#if USE_LOCKS /* Spin locks for gcc >= 4.1, older gcc on x86, MSC >= 1310 */
+#if ((defined(__GNUC__) && \
+ ((__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) || \
+ defined(__i386__) || defined(__x86_64__))) || \
+ (defined(_MSC_VER) && _MSC_VER>=1310))
+#ifndef USE_SPIN_LOCKS
+#define USE_SPIN_LOCKS 1
+#endif /* USE_SPIN_LOCKS */
+#elif USE_SPIN_LOCKS
+#error "USE_SPIN_LOCKS defined without implementation"
+#endif /* ... locks available... */
+#elif !defined(USE_SPIN_LOCKS)
+#define USE_SPIN_LOCKS 0
+#endif /* USE_LOCKS */
+
+#ifndef ONLY_MSPACES
+#define ONLY_MSPACES 0
+#endif /* ONLY_MSPACES */
+#ifndef MSPACES
+#if ONLY_MSPACES
+#define MSPACES 1
+#else /* ONLY_MSPACES */
+#define MSPACES 0
+#endif /* ONLY_MSPACES */
+#endif /* MSPACES */
+#ifndef MALLOC_ALIGNMENT
+#define MALLOC_ALIGNMENT ((size_t)8U)
+#endif /* MALLOC_ALIGNMENT */
+#ifndef FOOTERS
+#define FOOTERS 0
+#endif /* FOOTERS */
+#ifndef ABORT
+#define ABORT abort()
+#endif /* ABORT */
+#ifndef ABORT_ON_ASSERT_FAILURE
+#define ABORT_ON_ASSERT_FAILURE 1
+#endif /* ABORT_ON_ASSERT_FAILURE */
+#ifndef PROCEED_ON_ERROR
+#define PROCEED_ON_ERROR 0
+#endif /* PROCEED_ON_ERROR */
+
+#ifndef INSECURE
+#define INSECURE 0
+#endif /* INSECURE */
+#ifndef MALLOC_INSPECT_ALL
+#define MALLOC_INSPECT_ALL 0
+#endif /* MALLOC_INSPECT_ALL */
+#ifndef HAVE_MMAP
+#define HAVE_MMAP 1
+#endif /* HAVE_MMAP */
+#ifndef MMAP_CLEARS
+#define MMAP_CLEARS 1
+#endif /* MMAP_CLEARS */
+#ifndef HAVE_MREMAP
+#ifdef linux
+#define HAVE_MREMAP 1
+#define _GNU_SOURCE /* Turns on mremap() definition */
+#else /* linux */
+#define HAVE_MREMAP 0
+#endif /* linux */
+#endif /* HAVE_MREMAP */
+#ifndef MALLOC_FAILURE_ACTION
+#define MALLOC_FAILURE_ACTION errno = ENOMEM;
+#endif /* MALLOC_FAILURE_ACTION */
+#ifndef HAVE_MORECORE
+#if ONLY_MSPACES
+#define HAVE_MORECORE 0
+#else /* ONLY_MSPACES */
+#define HAVE_MORECORE 1
+#endif /* ONLY_MSPACES */
+#endif /* HAVE_MORECORE */
+#if !HAVE_MORECORE
+#define MORECORE_CONTIGUOUS 0
+#else /* !HAVE_MORECORE */
+#define MORECORE_DEFAULT sbrk
+#ifndef MORECORE_CONTIGUOUS
+#define MORECORE_CONTIGUOUS 1
+#endif /* MORECORE_CONTIGUOUS */
+#endif /* HAVE_MORECORE */
+#ifndef DEFAULT_GRANULARITY
+#if (MORECORE_CONTIGUOUS || defined(WIN32))
+#define DEFAULT_GRANULARITY (0) /* 0 means to compute in init_mparams */
+#else /* MORECORE_CONTIGUOUS */
+#define DEFAULT_GRANULARITY ((size_t)64U * (size_t)1024U)
+#endif /* MORECORE_CONTIGUOUS */
+#endif /* DEFAULT_GRANULARITY */
+#ifndef DEFAULT_TRIM_THRESHOLD
+#ifndef MORECORE_CANNOT_TRIM
+#define DEFAULT_TRIM_THRESHOLD ((size_t)2U * (size_t)1024U * (size_t)1024U)
+#else /* MORECORE_CANNOT_TRIM */
+#define DEFAULT_TRIM_THRESHOLD MAX_SIZE_T
+#endif /* MORECORE_CANNOT_TRIM */
+#endif /* DEFAULT_TRIM_THRESHOLD */
+#ifndef DEFAULT_MMAP_THRESHOLD
+#if HAVE_MMAP
+#define DEFAULT_MMAP_THRESHOLD ((size_t)256U * (size_t)1024U)
+#else /* HAVE_MMAP */
+#define DEFAULT_MMAP_THRESHOLD MAX_SIZE_T
+#endif /* HAVE_MMAP */
+#endif /* DEFAULT_MMAP_THRESHOLD */
+#ifndef MAX_RELEASE_CHECK_RATE
+#if HAVE_MMAP
+#define MAX_RELEASE_CHECK_RATE 4095
+#else
+#define MAX_RELEASE_CHECK_RATE MAX_SIZE_T
+#endif /* HAVE_MMAP */
+#endif /* MAX_RELEASE_CHECK_RATE */
+#ifndef USE_BUILTIN_FFS
+#define USE_BUILTIN_FFS 0
+#endif /* USE_BUILTIN_FFS */
+#ifndef USE_DEV_RANDOM
+#define USE_DEV_RANDOM 0
+#endif /* USE_DEV_RANDOM */
+#ifndef NO_MALLINFO
+#define NO_MALLINFO 0
+#endif /* NO_MALLINFO */
+#ifndef MALLINFO_FIELD_TYPE
+#define MALLINFO_FIELD_TYPE size_t
+#endif /* MALLINFO_FIELD_TYPE */
+#ifndef NO_MALLOC_STATS
+#define NO_MALLOC_STATS 0
+#endif /* NO_MALLOC_STATS */
+#ifndef NO_SEGMENT_TRAVERSAL
+#define NO_SEGMENT_TRAVERSAL 0
+#endif /* NO_SEGMENT_TRAVERSAL */
+
+/*
+ mallopt tuning options. SVID/XPG defines four standard parameter
+ numbers for mallopt, normally defined in malloc.h. None of these
+ are used in this malloc, so setting them has no effect. But this
+ malloc does support the following options.
+*/
+
+#define M_TRIM_THRESHOLD (-1)
+#define M_GRANULARITY (-2)
+#define M_MMAP_THRESHOLD (-3)
+
+/* ------------------------ Mallinfo declarations ------------------------ */
+
+#if !NO_MALLINFO
+/*
+ This version of malloc supports the standard SVID/XPG mallinfo
+ routine that returns a struct containing usage properties and
+ statistics. It should work on any system that has a
+ /usr/include/malloc.h defining struct mallinfo. The main
+ declaration needed is the mallinfo struct that is returned (by-copy)
+ by mallinfo(). The malloinfo struct contains a bunch of fields that
+ are not even meaningful in this version of malloc. These fields are
+ are instead filled by mallinfo() with other numbers that might be of
+ interest.
+
+ HAVE_USR_INCLUDE_MALLOC_H should be set if you have a
+ /usr/include/malloc.h file that includes a declaration of struct
+ mallinfo. If so, it is included; else a compliant version is
+ declared below. These must be precisely the same for mallinfo() to
+ work. The original SVID version of this struct, defined on most
+ systems with mallinfo, declares all fields as ints. But some others
+ define as unsigned long. If your system defines the fields using a
+ type of different width than listed here, you MUST #include your
+ system version and #define HAVE_USR_INCLUDE_MALLOC_H.
+*/
+
+/* #define HAVE_USR_INCLUDE_MALLOC_H */
+
+#ifdef HAVE_USR_INCLUDE_MALLOC_H
+#include "/usr/include/malloc.h"
+#else /* HAVE_USR_INCLUDE_MALLOC_H */
+#ifndef STRUCT_MALLINFO_DECLARED
+/* HP-UX (and others?) redefines mallinfo unless _STRUCT_MALLINFO is defined */
+#define _STRUCT_MALLINFO
+#define STRUCT_MALLINFO_DECLARED 1
+struct mallinfo {
+ MALLINFO_FIELD_TYPE arena; /* non-mmapped space allocated from system */
+ MALLINFO_FIELD_TYPE ordblks; /* number of free chunks */
+ MALLINFO_FIELD_TYPE smblks; /* always 0 */
+ MALLINFO_FIELD_TYPE hblks; /* always 0 */
+ MALLINFO_FIELD_TYPE hblkhd; /* space in mmapped regions */
+ MALLINFO_FIELD_TYPE usmblks; /* maximum total allocated space */
+ MALLINFO_FIELD_TYPE fsmblks; /* always 0 */
+ MALLINFO_FIELD_TYPE uordblks; /* total allocated space */
+ MALLINFO_FIELD_TYPE fordblks; /* total free space */
+ MALLINFO_FIELD_TYPE keepcost; /* releasable (via malloc_trim) space */
+};
+#endif /* STRUCT_MALLINFO_DECLARED */
+#endif /* HAVE_USR_INCLUDE_MALLOC_H */
+#endif /* NO_MALLINFO */
+
+/*
+ Try to persuade compilers to inline. The most critical functions for
+ inlining are defined as macros, so these aren't used for them.
+*/
+
+#ifndef FORCEINLINE
+ #if defined(__GNUC__)
+#define FORCEINLINE __inline __attribute__ ((always_inline))
+ #elif defined(_MSC_VER)
+ #define FORCEINLINE __forceinline
+ #endif
+#endif
+#ifndef NOINLINE
+ #if defined(__GNUC__)
+ #define NOINLINE __attribute__ ((noinline))
+ #elif defined(_MSC_VER)
+ #define NOINLINE __declspec(noinline)
+ #else
+ #define NOINLINE
+ #endif
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#ifndef FORCEINLINE
+ #define FORCEINLINE inline
+#endif
+#endif /* __cplusplus */
+#ifndef FORCEINLINE
+ #define FORCEINLINE
+#endif
+
+#if !ONLY_MSPACES
+
+/* ------------------- Declarations of public routines ------------------- */
+
+#ifndef USE_DL_PREFIX
+#define dlcalloc calloc
+#define dlfree free
+#define dlmalloc malloc
+#define dlmemalign aligned_alloc
+#define dlposix_memalign posix_memalign
+#define dlrealloc realloc
+#define dlrealloc_in_place realloc_in_place
+#define dlvalloc valloc
+#define dlpvalloc pvalloc
+#define dlmallinfo mallinfo
+#define dlmallopt mallopt
+#define dlmalloc_trim malloc_trim
+#define dlmalloc_stats malloc_stats
+#define dlmalloc_usable_size malloc_usable_size
+#define dlmalloc_footprint malloc_footprint
+#define dlmalloc_max_footprint malloc_max_footprint
+#define dlmalloc_footprint_limit malloc_footprint_limit
+#define dlmalloc_set_footprint_limit malloc_set_footprint_limit
+#define dlmalloc_inspect_all malloc_inspect_all
+#define dlindependent_calloc independent_calloc
+#define dlindependent_comalloc independent_comalloc
+#define dlbulk_free bulk_free
+#endif /* USE_DL_PREFIX */
+
+#if 0 // Redeclaration warnings as PDCLib already declares these in <stdio.h>
+
+/*
+ malloc(size_t n)
+ Returns a pointer to a newly allocated chunk of at least n bytes, or
+ null if no space is available, in which case errno is set to ENOMEM
+ on ANSI C systems.
+
+ If n is zero, malloc returns a minimum-sized chunk. (The minimum
+ size is 16 bytes on most 32bit systems, and 32 bytes on 64bit
+ systems.) Note that size_t is an unsigned type, so calls with
+ arguments that would be negative if signed are interpreted as
+ requests for huge amounts of space, which will often fail. The
+ maximum supported value of n differs across systems, but is in all
+ cases less than the maximum representable value of a size_t.
+*/
+DLMALLOC_EXPORT void* dlmalloc(size_t);
+
+/*
+ free(void* p)
+ Releases the chunk of memory pointed to by p, that had been previously
+ allocated using malloc or a related routine such as realloc.
+ It has no effect if p is null. If p was not malloced or already
+ freed, free(p) will by default cause the current program to abort.
+*/
+DLMALLOC_EXPORT void dlfree(void*);
+
+/*
+ calloc(size_t n_elements, size_t element_size);
+ Returns a pointer to n_elements * element_size bytes, with all locations
+ set to zero.
+*/
+DLMALLOC_EXPORT void* dlcalloc(size_t, size_t);
+
+/*
+ realloc(void* p, size_t n)
+ Returns a pointer to a chunk of size n that contains the same data
+ as does chunk p up to the minimum of (n, p's size) bytes, or null
+ if no space is available.
+
+ The returned pointer may or may not be the same as p. The algorithm
+ prefers extending p in most cases when possible, otherwise it
+ employs the equivalent of a malloc-copy-free sequence.
+
+ If p is null, realloc is equivalent to malloc.
+
+ If space is not available, realloc returns null, errno is set (if on
+ ANSI) and p is NOT freed.
+
+ if n is for fewer bytes than already held by p, the newly unused
+ space is lopped off and freed if possible. realloc with a size
+ argument of zero (re)allocates a minimum-sized chunk.
+
+ The old unix realloc convention of allowing the last-free'd chunk
+ to be used as an argument to realloc is not supported.
+*/
+DLMALLOC_EXPORT void* dlrealloc(void*, size_t);
+
+#endif
+
+/*
+ realloc_in_place(void* p, size_t n)
+ Resizes the space allocated for p to size n, only if this can be
+ done without moving p (i.e., only if there is adjacent space
+ available if n is greater than p's current allocated size, or n is
+ less than or equal to p's size). This may be used instead of plain
+ realloc if an alternative allocation strategy is needed upon failure
+ to expand space; for example, reallocation of a buffer that must be
+ memory-aligned or cleared. You can use realloc_in_place to trigger
+ these alternatives only when needed.
+
+ Returns p if successful; otherwise null.
+*/
+DLMALLOC_EXPORT void* dlrealloc_in_place(void*, size_t);
+
+#if 0 // Redeclaration warnings as PDCLib already declares these in <stdio.h>
+
+/*
+ memalign(size_t alignment, size_t n);
+ Returns a pointer to a newly allocated chunk of n bytes, aligned
+ in accord with the alignment argument.
+
+ The alignment argument should be a power of two. If the argument is
+ not a power of two, the nearest greater power is used.
+ 8-byte alignment is guaranteed by normal malloc calls, so don't
+ bother calling memalign with an argument of 8 or less.
+
+ Overreliance on memalign is a sure way to fragment space.
+*/
+DLMALLOC_EXPORT void* dlmemalign(size_t, size_t);
+
+#endif
+
+/*
+ int posix_memalign(void** pp, size_t alignment, size_t n);
+ Allocates a chunk of n bytes, aligned in accord with the alignment
+ argument. Differs from memalign only in that it (1) assigns the
+ allocated memory to *pp rather than returning it, (2) fails and
+ returns EINVAL if the alignment is not a power of two (3) fails and
+ returns ENOMEM if memory cannot be allocated.
+*/
+DLMALLOC_EXPORT int dlposix_memalign(void**, size_t, size_t);
+
+/*
+ valloc(size_t n);
+ Equivalent to memalign(pagesize, n), where pagesize is the page
+ size of the system. If the pagesize is unknown, 4096 is used.
+*/
+DLMALLOC_EXPORT void* dlvalloc(size_t);
+
+/*
+ mallopt(int parameter_number, int parameter_value)
+ Sets tunable parameters The format is to provide a
+ (parameter-number, parameter-value) pair. mallopt then sets the
+ corresponding parameter to the argument value if it can (i.e., so
+ long as the value is meaningful), and returns 1 if successful else
+ 0. To workaround the fact that mallopt is specified to use int,
+ not size_t parameters, the value -1 is specially treated as the
+ maximum unsigned size_t value.
+
+ SVID/XPG/ANSI defines four standard param numbers for mallopt,
+ normally defined in malloc.h. None of these are use in this malloc,
+ so setting them has no effect. But this malloc also supports other
+ options in mallopt. See below for details. Briefly, supported
+ parameters are as follows (listed defaults are for "typical"
+ configurations).
+
+ Symbol param # default allowed param values
+ M_TRIM_THRESHOLD -1 2*1024*1024 any (-1 disables)
+ M_GRANULARITY -2 page size any power of 2 >= page size
+ M_MMAP_THRESHOLD -3 256*1024 any (or 0 if no MMAP support)
+*/
+DLMALLOC_EXPORT int dlmallopt(int, int);
+
+/*
+ malloc_footprint();
+ Returns the number of bytes obtained from the system. The total
+ number of bytes allocated by malloc, realloc etc., is less than this
+ value. Unlike mallinfo, this function returns only a precomputed
+ result, so can be called frequently to monitor memory consumption.
+ Even if locks are otherwise defined, this function does not use them,
+ so results might not be up to date.
+*/
+DLMALLOC_EXPORT size_t dlmalloc_footprint(void);
+
+/*
+ malloc_max_footprint();
+ Returns the maximum number of bytes obtained from the system. This
+ value will be greater than current footprint if deallocated space
+ has been reclaimed by the system. The peak number of bytes allocated
+ by malloc, realloc etc., is less than this value. Unlike mallinfo,
+ this function returns only a precomputed result, so can be called
+ frequently to monitor memory consumption. Even if locks are
+ otherwise defined, this function does not use them, so results might
+ not be up to date.
+*/
+DLMALLOC_EXPORT size_t dlmalloc_max_footprint(void);
+
+/*
+ malloc_footprint_limit();
+ Returns the number of bytes that the heap is allowed to obtain from
+ the system, returning the last value returned by
+ malloc_set_footprint_limit, or the maximum size_t value if
+ never set. The returned value reflects a permission. There is no
+ guarantee that this number of bytes can actually be obtained from
+ the system.
+*/
+DLMALLOC_EXPORT size_t dlmalloc_footprint_limit(void);
+
+/*
+ malloc_set_footprint_limit();
+ Sets the maximum number of bytes to obtain from the system, causing
+ failure returns from malloc and related functions upon attempts to
+ exceed this value. The argument value may be subject to page
+ rounding to an enforceable limit; this actual value is returned.
+ Using an argument of the maximum possible size_t effectively
+ disables checks. If the argument is less than or equal to the
+ current malloc_footprint, then all future allocations that require
+ additional system memory will fail. However, invocation cannot
+ retroactively deallocate existing used memory.
+*/
+DLMALLOC_EXPORT size_t dlmalloc_set_footprint_limit(size_t bytes);
+
+#if MALLOC_INSPECT_ALL
+/*
+ malloc_inspect_all(void(*handler)(void *start,
+ void *end,
+ size_t used_bytes,
+ void* callback_arg),
+ void* arg);
+ Traverses the heap and calls the given handler for each managed
+ region, skipping all bytes that are (or may be) used for bookkeeping
+ purposes. Traversal does not include include chunks that have been
+ directly memory mapped. Each reported region begins at the start
+ address, and continues up to but not including the end address. The
+ first used_bytes of the region contain allocated data. If
+ used_bytes is zero, the region is unallocated. The handler is
+ invoked with the given callback argument. If locks are defined, they
+ are held during the entire traversal. It is a bad idea to invoke
+ other malloc functions from within the handler.
+
+ For example, to count the number of in-use chunks with size greater
+ than 1000, you could write:
+ static int count = 0;
+ void count_chunks(void* start, void* end, size_t used, void* arg) {
+ if (used >= 1000) ++count;
+ }
+ then:
+ malloc_inspect_all(count_chunks, NULL);
+
+ malloc_inspect_all is compiled only if MALLOC_INSPECT_ALL is defined.
+*/
+DLMALLOC_EXPORT void dlmalloc_inspect_all(void(*handler)(void*, void *, size_t, void*),
+ void* arg);
+
+#endif /* MALLOC_INSPECT_ALL */
+
+#if !NO_MALLINFO
+/*
+ mallinfo()
+ Returns (by copy) a struct containing various summary statistics:
+
+ arena: current total non-mmapped bytes allocated from system
+ ordblks: the number of free chunks
+ smblks: always zero.
+ hblks: current number of mmapped regions
+ hblkhd: total bytes held in mmapped regions
+ usmblks: the maximum total allocated space. This will be greater
+ than current total if trimming has occurred.
+ fsmblks: always zero
+ uordblks: current total allocated space (normal or mmapped)
+ fordblks: total free space
+ keepcost: the maximum number of bytes that could ideally be released
+ back to system via malloc_trim. ("ideally" means that
+ it ignores page restrictions etc.)
+
+ Because these fields are ints, but internal bookkeeping may
+ be kept as longs, the reported values may wrap around zero and
+ thus be inaccurate.
+*/
+DLMALLOC_EXPORT struct mallinfo dlmallinfo(void);
+#endif /* NO_MALLINFO */
+
+/*
+ independent_calloc(size_t n_elements, size_t element_size, void* chunks[]);
+
+ independent_calloc is similar to calloc, but instead of returning a
+ single cleared space, it returns an array of pointers to n_elements
+ independent elements that can hold contents of size elem_size, each
+ of which starts out cleared, and can be independently freed,
+ realloc'ed etc. The elements are guaranteed to be adjacently
+ allocated (this is not guaranteed to occur with multiple callocs or
+ mallocs), which may also improve cache locality in some
+ applications.
+
+ The "chunks" argument is optional (i.e., may be null, which is
+ probably the most typical usage). If it is null, the returned array
+ is itself dynamically allocated and should also be freed when it is
+ no longer needed. Otherwise, the chunks array must be of at least
+ n_elements in length. It is filled in with the pointers to the
+ chunks.
+
+ In either case, independent_calloc returns this pointer array, or
+ null if the allocation failed. If n_elements is zero and "chunks"
+ is null, it returns a chunk representing an array with zero elements
+ (which should be freed if not wanted).
+
+ Each element must be freed when it is no longer needed. This can be
+ done all at once using bulk_free.
+
+ independent_calloc simplifies and speeds up implementations of many
+ kinds of pools. It may also be useful when constructing large data
+ structures that initially have a fixed number of fixed-sized nodes,
+ but the number is not known at compile time, and some of the nodes
+ may later need to be freed. For example:
+
+ struct Node { int item; struct Node* next; };
+
+ struct Node* build_list() {
+ struct Node** pool;
+ int n = read_number_of_nodes_needed();
+ if (n <= 0) return 0;
+ pool = (struct Node**)(independent_calloc(n, sizeof(struct Node), 0);
+ if (pool == 0) die();
+ // organize into a linked list...
+ struct Node* first = pool[0];
+ for (i = 0; i < n-1; ++i)
+ pool[i]->next = pool[i+1];
+ free(pool); // Can now free the array (or not, if it is needed later)
+ return first;
+ }
+*/
+DLMALLOC_EXPORT void** dlindependent_calloc(size_t, size_t, void**);
+
+/*
+ independent_comalloc(size_t n_elements, size_t sizes[], void* chunks[]);
+
+ independent_comalloc allocates, all at once, a set of n_elements
+ chunks with sizes indicated in the "sizes" array. It returns
+ an array of pointers to these elements, each of which can be
+ independently freed, realloc'ed etc. The elements are guaranteed to
+ be adjacently allocated (this is not guaranteed to occur with
+ multiple callocs or mallocs), which may also improve cache locality
+ in some applications.
+
+ The "chunks" argument is optional (i.e., may be null). If it is null
+ the returned array is itself dynamically allocated and should also
+ be freed when it is no longer needed. Otherwise, the chunks array
+ must be of at least n_elements in length. It is filled in with the
+ pointers to the chunks.
+
+ In either case, independent_comalloc returns this pointer array, or
+ null if the allocation failed. If n_elements is zero and chunks is
+ null, it returns a chunk representing an array with zero elements
+ (which should be freed if not wanted).
+
+ Each element must be freed when it is no longer needed. This can be
+ done all at once using bulk_free.
+
+ independent_comallac differs from independent_calloc in that each
+ element may have a different size, and also that it does not
+ automatically clear elements.
+
+ independent_comalloc can be used to speed up allocation in cases
+ where several structs or objects must always be allocated at the
+ same time. For example:
+
+ struct Head { ... }
+ struct Foot { ... }
+
+ void send_message(char* msg) {
+ int msglen = strlen(msg);
+ size_t sizes[3] = { sizeof(struct Head), msglen, sizeof(struct Foot) };
+ void* chunks[3];
+ if (independent_comalloc(3, sizes, chunks) == 0)
+ die();
+ struct Head* head = (struct Head*)(chunks[0]);
+ char* body = (char*)(chunks[1]);
+ struct Foot* foot = (struct Foot*)(chunks[2]);
+ // ...
+ }
+
+ In general though, independent_comalloc is worth using only for
+ larger values of n_elements. For small values, you probably won't
+ detect enough difference from series of malloc calls to bother.
+
+ Overuse of independent_comalloc can increase overall memory usage,
+ since it cannot reuse existing noncontiguous small chunks that
+ might be available for some of the elements.
+*/
+DLMALLOC_EXPORT void** dlindependent_comalloc(size_t, size_t*, void**);
+
+/*
+ bulk_free(void* array[], size_t n_elements)
+ Frees and clears (sets to null) each non-null pointer in the given
+ array. This is likely to be faster than freeing them one-by-one.
+ If footers are used, pointers that have been allocated in different
+ mspaces are not freed or cleared, and the count of all such pointers
+ is returned. For large arrays of pointers with poor locality, it
+ may be worthwhile to sort this array before calling bulk_free.
+*/
+DLMALLOC_EXPORT size_t dlbulk_free(void**, size_t n_elements);
+
+/*
+ pvalloc(size_t n);
+ Equivalent to valloc(minimum-page-that-holds(n)), that is,
+ round up n to nearest pagesize.
+ */
+DLMALLOC_EXPORT void* dlpvalloc(size_t);
+
+/*
+ malloc_trim(size_t pad);
+
+ If possible, gives memory back to the system (via negative arguments
+ to sbrk) if there is unused memory at the `high' end of the malloc
+ pool or in unused MMAP segments. You can call this after freeing
+ large blocks of memory to potentially reduce the system-level memory
+ requirements of a program. However, it cannot guarantee to reduce
+ memory. Under some allocation patterns, some large free blocks of
+ memory will be locked between two used chunks, so they cannot be
+ given back to the system.
+
+ The `pad' argument to malloc_trim represents the amount of free
+ trailing space to leave untrimmed. If this argument is zero, only
+ the minimum amount of memory to maintain internal data structures
+ will be left. Non-zero arguments can be supplied to maintain enough
+ trailing space to service future expected allocations without having
+ to re-obtain memory from the system.
+
+ Malloc_trim returns 1 if it actually released any memory, else 0.
+*/
+DLMALLOC_EXPORT int dlmalloc_trim(size_t);
+
+/*
+ malloc_stats();
+ Prints on stderr the amount of space obtained from the system (both
+ via sbrk and mmap), the maximum amount (which may be more than
+ current if malloc_trim and/or munmap got called), and the current
+ number of bytes allocated via malloc (or realloc, etc) but not yet
+ freed. Note that this is the number of bytes allocated, not the
+ number requested. It will be larger than the number requested
+ because of alignment and bookkeeping overhead. Because it includes
+ alignment wastage as being in use, this figure may be greater than
+ zero even when no user-level chunks are allocated.
+
+ The reported current and maximum system memory can be inaccurate if
+ a program makes other calls to system memory allocation functions
+ (normally sbrk) outside of malloc.
+
+ malloc_stats prints only the most commonly interesting statistics.
+ More information can be obtained by calling mallinfo.
+*/
+DLMALLOC_EXPORT void dlmalloc_stats(void);
+
+#endif /* ONLY_MSPACES */
+
+/*
+ malloc_usable_size(void* p);
+
+ Returns the number of bytes you can actually use in
+ an allocated chunk, which may be more than you requested (although
+ often not) due to alignment and minimum size constraints.
+ You can use this many bytes without worrying about
+ overwriting other allocated objects. This is not a particularly great
+ programming practice. malloc_usable_size can be more useful in
+ debugging and assertions, for example:
+
+ p = malloc(n);
+ assert(malloc_usable_size(p) >= 256);
+*/
+size_t dlmalloc_usable_size(void*);
+
+#if MSPACES
+
+/*
+ mspace is an opaque type representing an independent
+ region of space that supports mspace_malloc, etc.
+*/
+typedef void* mspace;
+
+/*
+ create_mspace creates and returns a new independent space with the
+ given initial capacity, or, if 0, the default granularity size. It
+ returns null if there is no system memory available to create the
+ space. If argument locked is non-zero, the space uses a separate
+ lock to control access. The capacity of the space will grow
+ dynamically as needed to service mspace_malloc requests. You can
+ control the sizes of incremental increases of this space by
+ compiling with a different DEFAULT_GRANULARITY or dynamically
+ setting with mallopt(M_GRANULARITY, value).
+*/
+DLMALLOC_EXPORT mspace create_mspace(size_t capacity, int locked);
+
+/*
+ destroy_mspace destroys the given space, and attempts to return all
+ of its memory back to the system, returning the total number of
+ bytes freed. After destruction, the results of access to all memory
+ used by the space become undefined.
+*/
+DLMALLOC_EXPORT size_t destroy_mspace(mspace msp);
+
+/*
+ create_mspace_with_base uses the memory supplied as the initial base
+ of a new mspace. Part (less than 128*sizeof(size_t) bytes) of this
+ space is used for bookkeeping, so the capacity must be at least this
+ large. (Otherwise 0 is returned.) When this initial space is
+ exhausted, additional memory will be obtained from the system.
+ Destroying this space will deallocate all additionally allocated
+ space (if possible) but not the initial base.
+*/
+DLMALLOC_EXPORT mspace create_mspace_with_base(void* base, size_t capacity, int locked);
+
+/*
+ mspace_track_large_chunks controls whether requests for large chunks
+ are allocated in their own untracked mmapped regions, separate from
+ others in this mspace. By default large chunks are not tracked,
+ which reduces fragmentation. However, such chunks are not
+ necessarily released to the system upon destroy_mspace. Enabling
+ tracking by setting to true may increase fragmentation, but avoids
+ leakage when relying on destroy_mspace to release all memory
+ allocated using this space. The function returns the previous
+ setting.
+*/
+DLMALLOC_EXPORT int mspace_track_large_chunks(mspace msp, int enable);
+
+
+/*
+ mspace_malloc behaves as malloc, but operates within
+ the given space.
+*/
+DLMALLOC_EXPORT void* mspace_malloc(mspace msp, size_t bytes);
+
+/*
+ mspace_free behaves as free, but operates within
+ the given space.
+
+ If compiled with FOOTERS==1, mspace_free is not actually needed.
+ free may be called instead of mspace_free because freed chunks from
+ any space are handled by their originating spaces.
+*/
+DLMALLOC_EXPORT void mspace_free(mspace msp, void* mem);
+
+/*
+ mspace_realloc behaves as realloc, but operates within
+ the given space.
+
+ If compiled with FOOTERS==1, mspace_realloc is not actually
+ needed. realloc may be called instead of mspace_realloc because
+ realloced chunks from any space are handled by their originating
+ spaces.
+*/
+DLMALLOC_EXPORT void* mspace_realloc(mspace msp, void* mem, size_t newsize);
+
+/*
+ mspace_calloc behaves as calloc, but operates within
+ the given space.
+*/
+DLMALLOC_EXPORT void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size);
+
+/*
+ mspace_memalign behaves as memalign, but operates within
+ the given space.
+*/
+DLMALLOC_EXPORT void* mspace_memalign(mspace msp, size_t alignment, size_t bytes);
+
+/*
+ mspace_independent_calloc behaves as independent_calloc, but
+ operates within the given space.
+*/
+DLMALLOC_EXPORT void** mspace_independent_calloc(mspace msp, size_t n_elements,
+ size_t elem_size, void* chunks[]);
+
+/*
+ mspace_independent_comalloc behaves as independent_comalloc, but
+ operates within the given space.
+*/
+DLMALLOC_EXPORT void** mspace_independent_comalloc(mspace msp, size_t n_elements,
+ size_t sizes[], void* chunks[]);
+
+/*
+ mspace_footprint() returns the number of bytes obtained from the
+ system for this space.
+*/
+DLMALLOC_EXPORT size_t mspace_footprint(mspace msp);
+
+/*
+ mspace_max_footprint() returns the peak number of bytes obtained from the
+ system for this space.
+*/
+DLMALLOC_EXPORT size_t mspace_max_footprint(mspace msp);
+
+
+#if !NO_MALLINFO
+/*
+ mspace_mallinfo behaves as mallinfo, but reports properties of
+ the given space.
+*/
+DLMALLOC_EXPORT struct mallinfo mspace_mallinfo(mspace msp);
+#endif /* NO_MALLINFO */
+
+/*
+ malloc_usable_size(void* p) behaves the same as malloc_usable_size;
+*/
+DLMALLOC_EXPORT size_t mspace_usable_size(void* mem);
+
+/*
+ mspace_malloc_stats behaves as malloc_stats, but reports
+ properties of the given space.
+*/
+DLMALLOC_EXPORT void mspace_malloc_stats(mspace msp);
+
+/*
+ mspace_trim behaves as malloc_trim, but
+ operates within the given space.
+*/
+DLMALLOC_EXPORT int mspace_trim(mspace msp, size_t pad);
+
+/*
+ An alias for mallopt.
+*/
+DLMALLOC_EXPORT int mspace_mallopt(int, int);
+
+#endif /* MSPACES */
+
+#ifdef __cplusplus
+} /* end of extern "C" */
+#endif /* __cplusplus */
+
+/*
+ ========================================================================
+ To make a fully customizable malloc.h header file, cut everything
+ above this line, put into file malloc.h, edit to suit, and #include it
+ on the next line, as well as in programs that use this malloc.
+ ========================================================================
+*/
+
+/* #include "malloc.h" */
+
+/*------------------------------ internal #includes ---------------------- */
+
+#ifdef _MSC_VER
+#pragma warning( disable : 4146 ) /* no "unsigned" warnings */
+#endif /* _MSC_VER */
+#if !NO_MALLOC_STATS
+#include <stdio.h> /* for printing in malloc_stats */
+#endif /* NO_MALLOC_STATS */
+#ifndef LACKS_ERRNO_H
+#include <errno.h> /* for MALLOC_FAILURE_ACTION */
+#endif /* LACKS_ERRNO_H */
+#ifdef DEBUG
+#if ABORT_ON_ASSERT_FAILURE
+#undef assert
+#define assert(x) if(!(x)) ABORT
+#else /* ABORT_ON_ASSERT_FAILURE */
+#include <assert.h>
+#endif /* ABORT_ON_ASSERT_FAILURE */
+#else /* DEBUG */
+#ifndef assert
+#define assert(x)
+#endif
+#define DEBUG 0
+#endif /* DEBUG */
+#if !defined(WIN32) && !defined(LACKS_TIME_H)
+#include <time.h> /* for magic initialization */
+#endif /* WIN32 */
+#ifndef LACKS_STDLIB_H
+#include <stdlib.h> /* for abort() */
+#endif /* LACKS_STDLIB_H */
+#ifndef LACKS_STRING_H
+#include <string.h> /* for memset etc */
+#endif /* LACKS_STRING_H */
+#if USE_BUILTIN_FFS
+#ifndef LACKS_STRINGS_H
+#include <strings.h> /* for ffs */
+#endif /* LACKS_STRINGS_H */
+#endif /* USE_BUILTIN_FFS */
+#if HAVE_MMAP
+#ifndef LACKS_SYS_MMAN_H
+/* On some versions of linux, mremap decl in mman.h needs __USE_GNU set */
+#if (defined(linux) && !defined(__USE_GNU))
+#define __USE_GNU 1
+#include <sys/mman.h> /* for mmap */
+#undef __USE_GNU
+#else
+#include <sys/mman.h> /* for mmap */
+#endif /* linux */
+#endif /* LACKS_SYS_MMAN_H */
+#ifndef LACKS_FCNTL_H
+#include <fcntl.h>
+#endif /* LACKS_FCNTL_H */
+#endif /* HAVE_MMAP */
+#ifndef LACKS_UNISTD_H
+#include <unistd.h> /* for sbrk, sysconf */
+#else /* LACKS_UNISTD_H */
+#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
+/*extern void* sbrk(ptrdiff_t);*/
+#endif /* FreeBSD etc */
+#endif /* LACKS_UNISTD_H */
+
+/* Declarations for locking */
+#if USE_LOCKS
+#ifndef WIN32
+#if defined (__SVR4) && defined (__sun) /* solaris */
+#include <thread.h>
+#elif !defined(LACKS_SCHED_H)
+#include <sched.h>
+#endif /* solaris or LACKS_SCHED_H */
+#if (defined(USE_RECURSIVE_LOCKS) && USE_RECURSIVE_LOCKS != 0) || !USE_SPIN_LOCKS
+/*#include <pthread.h>*/
+#endif /* USE_RECURSIVE_LOCKS ... */
+#elif defined(_MSC_VER)
+#ifndef _M_AMD64
+/* These are already defined on AMD64 builds */
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+LONG __cdecl _InterlockedCompareExchange(LONG volatile *Dest, LONG Exchange, LONG Comp);
+LONG __cdecl _InterlockedExchange(LONG volatile *Target, LONG Value);
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* _M_AMD64 */
+#pragma intrinsic (_InterlockedCompareExchange)
+#pragma intrinsic (_InterlockedExchange)
+#define interlockedcompareexchange _InterlockedCompareExchange
+#define interlockedexchange _InterlockedExchange
+#elif defined(WIN32) && defined(__GNUC__)
+#define interlockedcompareexchange(a, b, c) __sync_val_compare_and_swap(a, c, b)
+#define interlockedexchange __sync_lock_test_and_set
+#endif /* Win32 */
+#endif /* USE_LOCKS */
+
+/* Declarations for bit scanning on win32 */
+#if defined(_MSC_VER) && _MSC_VER>=1300
+#ifndef BitScanForward /* Try to avoid pulling in WinNT.h */
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+unsigned char _BitScanForward(unsigned long *index, unsigned long mask);
+unsigned char _BitScanReverse(unsigned long *index, unsigned long mask);
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#define BitScanForward _BitScanForward
+#define BitScanReverse _BitScanReverse
+#pragma intrinsic(_BitScanForward)
+#pragma intrinsic(_BitScanReverse)
+#endif /* BitScanForward */
+#endif /* defined(_MSC_VER) && _MSC_VER>=1300 */
+
+#ifndef WIN32
+#ifndef malloc_getpagesize
+# ifdef _SC_PAGESIZE /* some SVR4 systems omit an underscore */
+# ifndef _SC_PAGE_SIZE
+# define _SC_PAGE_SIZE _SC_PAGESIZE
+# endif
+# endif
+# ifdef _SC_PAGE_SIZE
+# define malloc_getpagesize sysconf(_SC_PAGE_SIZE)
+# else
+# if defined(BSD) || defined(DGUX) || defined(HAVE_GETPAGESIZE)
+ extern size_t getpagesize();
+# define malloc_getpagesize getpagesize()
+# else
+# ifdef WIN32 /* use supplied emulation of getpagesize */
+# define malloc_getpagesize getpagesize()
+# else
+# ifndef LACKS_SYS_PARAM_H
+# include <sys/param.h>
+# endif
+# ifdef EXEC_PAGESIZE
+# define malloc_getpagesize EXEC_PAGESIZE
+# else
+# ifdef NBPG
+# ifndef CLSIZE
+# define malloc_getpagesize NBPG
+# else
+# define malloc_getpagesize (NBPG * CLSIZE)
+# endif
+# else
+# ifdef NBPC
+# define malloc_getpagesize NBPC
+# else
+# ifdef PAGESIZE
+# define malloc_getpagesize PAGESIZE
+# else /* just guess */
+# define malloc_getpagesize ((size_t)4096U)
+# endif
+# endif
+# endif
+# endif
+# endif
+# endif
+# endif
+#endif
+#endif
+
+/* ------------------- size_t and alignment properties -------------------- */
+
+/* The byte and bit size of a size_t */
+#define SIZE_T_SIZE (sizeof(size_t))
+#define SIZE_T_BITSIZE (sizeof(size_t) << 3)
+
+/* Some constants coerced to size_t */
+/* Annoying but necessary to avoid errors on some platforms */
+#define SIZE_T_ZERO ((size_t)0)
+#define SIZE_T_ONE ((size_t)1)
+#define SIZE_T_TWO ((size_t)2)
+#define SIZE_T_FOUR ((size_t)4)
+#define TWO_SIZE_T_SIZES (SIZE_T_SIZE<<1)
+#define FOUR_SIZE_T_SIZES (SIZE_T_SIZE<<2)
+#define SIX_SIZE_T_SIZES (FOUR_SIZE_T_SIZES+TWO_SIZE_T_SIZES)
+#define HALF_MAX_SIZE_T (MAX_SIZE_T / 2U)
+
+/* The bit mask value corresponding to MALLOC_ALIGNMENT */
+#define CHUNK_ALIGN_MASK (MALLOC_ALIGNMENT - SIZE_T_ONE)
+
+/* True if address a has acceptable alignment */
+#define is_aligned(A) (((size_t)((A)) & (CHUNK_ALIGN_MASK)) == 0)
+
+/* the number of bytes to offset an address to align it */
+#define align_offset(A)\
+ ((((size_t)(A) & CHUNK_ALIGN_MASK) == 0)? 0 :\
+ ((MALLOC_ALIGNMENT - ((size_t)(A) & CHUNK_ALIGN_MASK)) & CHUNK_ALIGN_MASK))
+
+/* -------------------------- MMAP preliminaries ------------------------- */
+
+/*
+ If HAVE_MORECORE or HAVE_MMAP are false, we just define calls and
+ checks to fail so compiler optimizer can delete code rather than
+ using so many "#if"s.
+*/
+
+
+/* MORECORE and MMAP must return MFAIL on failure */
+#define MFAIL ((void*)(MAX_SIZE_T))
+#define CMFAIL ((char*)(MFAIL)) /* defined for convenience */
+
+#if HAVE_MMAP
+
+#ifdef MMAP_DEFAULT
+#elif !defined(WIN32)
+#define MUNMAP_DEFAULT(a, s) munmap((a), (s))
+#define MMAP_PROT (PROT_READ|PROT_WRITE)
+#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
+#define MAP_ANONYMOUS MAP_ANON
+#endif /* MAP_ANON */
+#ifdef MAP_ANONYMOUS
+#define MMAP_FLAGS (MAP_PRIVATE|MAP_ANONYMOUS)
+#define MMAP_DEFAULT(s) mmap(0, (s), MMAP_PROT, MMAP_FLAGS, -1, 0)
+#else /* MAP_ANONYMOUS */
+/*
+ Nearly all versions of mmap support MAP_ANONYMOUS, so the following
+ is unlikely to be needed, but is supplied just in case.
+*/
+#define MMAP_FLAGS (MAP_PRIVATE)
+#define MMAP_DEFAULT(s) ((dev_zero_fd < 0) ? \
+ (dev_zero_fd = open("/dev/zero", O_RDWR), \
+ mmap(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0)) : \
+ mmap(0, (s), MMAP_PROT, MMAP_FLAGS, dev_zero_fd, 0))
+#endif /* MAP_ANONYMOUS */
+
+#define DIRECT_MMAP_DEFAULT(s) MMAP_DEFAULT(s)
+
+#else /* WIN32 */
+
+/* Win32 MMAP via VirtualAlloc */
+static FORCEINLINE void* win32mmap(size_t size) {
+ void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
+ return (ptr != 0)? ptr: MFAIL;
+}
+
+/* For direct MMAP, use MEM_TOP_DOWN to minimize interference */
+static FORCEINLINE void* win32direct_mmap(size_t size) {
+ void* ptr = VirtualAlloc(0, size, MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN,
+ PAGE_READWRITE);
+ return (ptr != 0)? ptr: MFAIL;
+}
+
+/* This function supports releasing coalesed segments */
+static FORCEINLINE int win32munmap(void* ptr, size_t size) {
+ MEMORY_BASIC_INFORMATION minfo;
+ char* cptr = (char*)ptr;
+ while (size) {
+ if (VirtualQuery(cptr, &minfo, sizeof(minfo)) == 0)
+ return -1;
+ if (minfo.BaseAddress != cptr || minfo.AllocationBase != cptr ||
+ minfo.State != MEM_COMMIT || minfo.RegionSize > size)
+ return -1;
+ if (VirtualFree(cptr, 0, MEM_RELEASE) == 0)
+ return -1;
+ cptr += minfo.RegionSize;
+ size -= minfo.RegionSize;
+ }
+ return 0;
+}
+
+#define MMAP_DEFAULT(s) win32mmap(s)
+#define MUNMAP_DEFAULT(a, s) win32munmap((a), (s))
+#define DIRECT_MMAP_DEFAULT(s) win32direct_mmap(s)
+#endif /* WIN32 */
+#endif /* HAVE_MMAP */
+
+#if HAVE_MREMAP && !defined(MREMAP_DEFAULT)
+#ifndef WIN32
+#define MREMAP_DEFAULT(addr, osz, nsz, mv) mremap((addr), (osz), (nsz), (mv))
+#endif /* WIN32 */
+#endif /* HAVE_MREMAP */
+
+/**
+ * Define CALL_MORECORE
+ */
+#if HAVE_MORECORE
+ #ifdef MORECORE
+ #define CALL_MORECORE(S) MORECORE(S)
+ #else /* MORECORE */
+ #define CALL_MORECORE(S) MORECORE_DEFAULT(S)
+ #endif /* MORECORE */
+#else /* HAVE_MORECORE */
+ #define CALL_MORECORE(S) MFAIL
+#endif /* HAVE_MORECORE */
+
+/**
+ * Define CALL_MMAP/CALL_MUNMAP/CALL_DIRECT_MMAP
+ */
+#if HAVE_MMAP
+ #define USE_MMAP_BIT (SIZE_T_ONE)
+
+ #ifdef MMAP
+ #define CALL_MMAP(s) MMAP(s)
+ #else /* MMAP */
+ #define CALL_MMAP(s) MMAP_DEFAULT(s)
+ #endif /* MMAP */
+ #ifdef MUNMAP
+ #define CALL_MUNMAP(a, s) MUNMAP((a), (s))
+ #else /* MUNMAP */
+ #define CALL_MUNMAP(a, s) MUNMAP_DEFAULT((a), (s))
+ #endif /* MUNMAP */
+ #ifdef DIRECT_MMAP
+ #define CALL_DIRECT_MMAP(s) DIRECT_MMAP(s)
+ #else /* DIRECT_MMAP */
+ #define CALL_DIRECT_MMAP(s) DIRECT_MMAP_DEFAULT(s)
+ #endif /* DIRECT_MMAP */
+#else /* HAVE_MMAP */
+ #define USE_MMAP_BIT (SIZE_T_ZERO)
+
+ #define MMAP(s) MFAIL
+ #define MUNMAP(a, s) (-1)
+ #define DIRECT_MMAP(s) MFAIL
+ #define CALL_DIRECT_MMAP(s) DIRECT_MMAP(s)
+ #define CALL_MMAP(s) MMAP(s)
+ #define CALL_MUNMAP(a, s) MUNMAP((a), (s))
+#endif /* HAVE_MMAP */
+
+/**
+ * Define CALL_MREMAP
+ */
+#if HAVE_MMAP && HAVE_MREMAP
+ #ifdef MREMAP
+ #define CALL_MREMAP(addr, osz, nsz, mv) MREMAP((addr), (osz), (nsz), (mv))
+ #else /* MREMAP */
+ #define CALL_MREMAP(addr, osz, nsz, mv) MREMAP_DEFAULT((addr), (osz), (nsz), (mv))
+ #endif /* MREMAP */
+#else /* HAVE_MMAP && HAVE_MREMAP */
+ #define CALL_MREMAP(addr, osz, nsz, mv) MFAIL
+#endif /* HAVE_MMAP && HAVE_MREMAP */
+
+/* mstate bit set if continguous morecore disabled or failed */
+#define USE_NONCONTIGUOUS_BIT (4U)
+
+/* segment bit set in create_mspace_with_base */
+#define EXTERN_BIT (8U)
+
+
+/* --------------------------- Lock preliminaries ------------------------ */
+
+/*
+ When locks are defined, there is one global lock, plus
+ one per-mspace lock.
+
+ The global lock_ensures that mparams.magic and other unique
+ mparams values are initialized only once. It also protects
+ sequences of calls to MORECORE. In many cases sys_alloc requires
+ two calls, that should not be interleaved with calls by other
+ threads. This does not protect against direct calls to MORECORE
+ by other threads not using this lock, so there is still code to
+ cope the best we can on interference.
+
+ Per-mspace locks surround calls to malloc, free, etc.
+ By default, locks are simple non-reentrant mutexes.
+
+ Because lock-protected regions generally have bounded times, it is
+ OK to use the supplied simple spinlocks. Spinlocks are likely to
+ improve performance for lightly contended applications, but worsen
+ performance under heavy contention.
+
+ If USE_LOCKS is > 1, the definitions of lock routines here are
+ bypassed, in which case you will need to define the type MLOCK_T,
+ and at least INITIAL_LOCK, DESTROY_LOCK, ACQUIRE_LOCK, RELEASE_LOCK
+ and TRY_LOCK. You must also declare a
+ static MLOCK_T malloc_global_mutex = { initialization values };.
+
+*/
+
+#if !USE_LOCKS
+#define USE_LOCK_BIT (0U)
+#define INITIAL_LOCK(l) (0)
+#define DESTROY_LOCK(l) (0)
+#define ACQUIRE_MALLOC_GLOBAL_LOCK()
+#define RELEASE_MALLOC_GLOBAL_LOCK()
+
+#else
+#if USE_LOCKS > 1
+/* ----------------------- User-defined locks ------------------------ */
+/* Define your own lock implementation here */
+/* #define INITIAL_LOCK(lk) ... */
+/* #define DESTROY_LOCK(lk) ... */
+/* #define ACQUIRE_LOCK(lk) ... */
+/* #define RELEASE_LOCK(lk) ... */
+/* #define TRY_LOCK(lk) ... */
+/* static MLOCK_T malloc_global_mutex = ... */
+
+#elif USE_SPIN_LOCKS
+
+/* First, define CAS_LOCK and CLEAR_LOCK on ints */
+/* Note CAS_LOCK defined to return 0 on success */
+
+#if defined(__GNUC__)&& (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1))
+#define CAS_LOCK(sl) __sync_lock_test_and_set(sl, 1)
+#define CLEAR_LOCK(sl) __sync_lock_release(sl)
+
+#elif (defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)))
+/* Custom spin locks for older gcc on x86 */
+static FORCEINLINE int x86_cas_lock(int *sl) {
+ int ret;
+ int val = 1;
+ int cmp = 0;
+ __asm__ __volatile__ ("lock; cmpxchgl %1, %2"
+ : "=a" (ret)
+ : "r" (val), "m" (*(sl)), "0"(cmp)
+ : "memory", "cc");
+ return ret;
+}
+
+static FORCEINLINE void x86_clear_lock(int* sl) {
+ assert(*sl != 0);
+ int prev = 0;
+ int ret;
+ __asm__ __volatile__ ("lock; xchgl %0, %1"
+ : "=r" (ret)
+ : "m" (*(sl)), "0"(prev)
+ : "memory");
+}
+
+#define CAS_LOCK(sl) x86_cas_lock(sl)
+#define CLEAR_LOCK(sl) x86_clear_lock(sl)
+
+#else /* Win32 MSC */
+#define CAS_LOCK(sl) interlockedexchange(sl, 1)
+#define CLEAR_LOCK(sl) interlockedexchange (sl, 0)
+
+#endif /* ... gcc spins locks ... */
+
+/* How to yield for a spin lock */
+#define SPINS_PER_YIELD 63
+#if defined(_MSC_VER)
+#define SLEEP_EX_DURATION 50 /* delay for yield/sleep */
+#define SPIN_LOCK_YIELD SleepEx(SLEEP_EX_DURATION, FALSE)
+#elif defined (__SVR4) && defined (__sun) /* solaris */
+#define SPIN_LOCK_YIELD thr_yield();
+#elif !defined(LACKS_SCHED_H)
+#define SPIN_LOCK_YIELD sched_yield();
+#else
+#define SPIN_LOCK_YIELD
+#endif /* ... yield ... */
+
+#if !defined(USE_RECURSIVE_LOCKS) || USE_RECURSIVE_LOCKS == 0
+/* Plain spin locks use single word (embedded in malloc_states) */
+static int spin_acquire_lock(int *sl) {
+ int spins = 0;
+ while (*(volatile int *)sl != 0 || CAS_LOCK(sl)) {
+ if ((++spins & SPINS_PER_YIELD) == 0) {
+ SPIN_LOCK_YIELD;
+ }
+ }
+ return 0;
+}
+
+#define MLOCK_T int
+#define TRY_LOCK(sl) !CAS_LOCK(sl)
+#define RELEASE_LOCK(sl) CLEAR_LOCK(sl)
+#define ACQUIRE_LOCK(sl) (CAS_LOCK(sl)? spin_acquire_lock(sl) : 0)
+#define INITIAL_LOCK(sl) (*sl = 0)
+#define DESTROY_LOCK(sl) (0)
+static MLOCK_T malloc_global_mutex = 0;
+
+#else /* USE_RECURSIVE_LOCKS */
+/* types for lock owners */
+#ifdef WIN32
+#define THREAD_ID_T DWORD
+#define CURRENT_THREAD GetCurrentThreadId()
+#define EQ_OWNER(X,Y) ((X) == (Y))
+#else
+/*
+ Note: the following assume that pthread_t is a type that can be
+ initialized to (casted) zero. If this is not the case, you will need to
+ somehow redefine these or not use spin locks.
+*/
+#define THREAD_ID_T pthread_t
+#define CURRENT_THREAD pthread_self()
+#define EQ_OWNER(X,Y) pthread_equal(X, Y)
+#endif
+
+struct malloc_recursive_lock {
+ int sl;
+ unsigned int c;
+ THREAD_ID_T threadid;
+};
+
+#define MLOCK_T struct malloc_recursive_lock
+static MLOCK_T malloc_global_mutex = { 0, 0, (THREAD_ID_T)0};
+
+static FORCEINLINE void recursive_release_lock(MLOCK_T *lk) {
+ assert(lk->sl != 0);
+ if (--lk->c == 0) {
+ CLEAR_LOCK(&lk->sl);
+ }
+}
+
+static FORCEINLINE int recursive_acquire_lock(MLOCK_T *lk) {
+ THREAD_ID_T mythreadid = CURRENT_THREAD;
+ int spins = 0;
+ for (;;) {
+ if (*((volatile int *)(&lk->sl)) == 0) {
+ if (!CAS_LOCK(&lk->sl)) {
+ lk->threadid = mythreadid;
+ lk->c = 1;
+ return 0;
+ }
+ }
+ else if (EQ_OWNER(lk->threadid, mythreadid)) {
+ ++lk->c;
+ return 0;
+ }
+ if ((++spins & SPINS_PER_YIELD) == 0) {
+ SPIN_LOCK_YIELD;
+ }
+ }
+}
+
+static FORCEINLINE int recursive_try_lock(MLOCK_T *lk) {
+ THREAD_ID_T mythreadid = CURRENT_THREAD;
+ if (*((volatile int *)(&lk->sl)) == 0) {
+ if (!CAS_LOCK(&lk->sl)) {
+ lk->threadid = mythreadid;
+ lk->c = 1;
+ return 1;
+ }
+ }
+ else if (EQ_OWNER(lk->threadid, mythreadid)) {
+ ++lk->c;
+ return 1;
+ }
+ return 0;
+}
+
+#define RELEASE_LOCK(lk) recursive_release_lock(lk)
+#define TRY_LOCK(lk) recursive_try_lock(lk)
+#define ACQUIRE_LOCK(lk) recursive_acquire_lock(lk)
+#define INITIAL_LOCK(lk) ((lk)->threadid = (THREAD_ID_T)0, (lk)->sl = 0, (lk)->c = 0)
+#define DESTROY_LOCK(lk) (0)
+#endif /* USE_RECURSIVE_LOCKS */
+
+#elif defined(WIN32) /* Win32 critical sections */
+#define MLOCK_T CRITICAL_SECTION
+#define ACQUIRE_LOCK(lk) (EnterCriticalSection(lk), 0)
+#define RELEASE_LOCK(lk) LeaveCriticalSection(lk)
+#define TRY_LOCK(lk) TryEnterCriticalSection(lk)
+#define INITIAL_LOCK(lk) (!InitializeCriticalSectionAndSpinCount((lk), 0x80000000|4000))
+#define DESTROY_LOCK(lk) (DeleteCriticalSection(lk), 0)
+#define NEED_GLOBAL_LOCK_INIT
+
+static MLOCK_T malloc_global_mutex;
+static volatile long malloc_global_mutex_status;
+
+/* Use spin loop to initialize global lock */
+static void init_malloc_global_mutex() {
+ for (;;) {
+ long stat = malloc_global_mutex_status;
+ if (stat > 0)
+ return;
+ /* transition to < 0 while initializing, then to > 0) */
+ if (stat == 0 &&
+ interlockedcompareexchange(&malloc_global_mutex_status, -1, 0) == 0) {
+ InitializeCriticalSection(&malloc_global_mutex);
+ interlockedexchange(&malloc_global_mutex_status,1);
+ return;
+ }
+ SleepEx(0, FALSE);
+ }
+}
+
+#else /* pthreads-based locks */
+#define MLOCK_T pthread_mutex_t
+#define ACQUIRE_LOCK(lk) pthread_mutex_lock(lk)
+#define RELEASE_LOCK(lk) pthread_mutex_unlock(lk)
+#define TRY_LOCK(lk) (!pthread_mutex_trylock(lk))
+#define INITIAL_LOCK(lk) pthread_init_lock(lk)
+#define DESTROY_LOCK(lk) pthread_mutex_destroy(lk)
+
+#if defined(USE_RECURSIVE_LOCKS) && USE_RECURSIVE_LOCKS != 0 && defined(linux) && !defined(PTHREAD_MUTEX_RECURSIVE)
+/* Cope with old-style linux recursive lock initialization by adding */
+/* skipped internal declaration from pthread.h */
+extern int pthread_mutexattr_setkind_np __P ((pthread_mutexattr_t *__attr,
+ int __kind));
+#define PTHREAD_MUTEX_RECURSIVE PTHREAD_MUTEX_RECURSIVE_NP
+#define pthread_mutexattr_settype(x,y) pthread_mutexattr_setkind_np(x,y)
+#endif /* USE_RECURSIVE_LOCKS ... */
+
+static MLOCK_T malloc_global_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+static int pthread_init_lock (MLOCK_T *lk) {
+ pthread_mutexattr_t attr;
+ if (pthread_mutexattr_init(&attr)) return 1;
+#if defined(USE_RECURSIVE_LOCKS) && USE_RECURSIVE_LOCKS != 0
+ if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE)) return 1;
+#endif
+ if (pthread_mutex_init(lk, &attr)) return 1;
+ if (pthread_mutexattr_destroy(&attr)) return 1;
+ return 0;
+}
+
+#endif /* ... lock types ... */
+
+/* Common code for all lock types */
+#define USE_LOCK_BIT (2U)
+
+#ifndef ACQUIRE_MALLOC_GLOBAL_LOCK
+#define ACQUIRE_MALLOC_GLOBAL_LOCK() ACQUIRE_LOCK(&malloc_global_mutex);
+#endif
+
+#ifndef RELEASE_MALLOC_GLOBAL_LOCK
+#define RELEASE_MALLOC_GLOBAL_LOCK() RELEASE_LOCK(&malloc_global_mutex);
+#endif
+
+#endif /* USE_LOCKS */
+
+/* ----------------------- Chunk representations ------------------------ */
+
+/*
+ (The following includes lightly edited explanations by Colin Plumb.)
+
+ The malloc_chunk declaration below is misleading (but accurate and
+ necessary). It declares a "view" into memory allowing access to
+ necessary fields at known offsets from a given base.
+
+ Chunks of memory are maintained using a `boundary tag' method as
+ originally described by Knuth. (See the paper by Paul Wilson
+ ftp://ftp.cs.utexas.edu/pub/garbage/allocsrv.ps for a survey of such
+ techniques.) Sizes of free chunks are stored both in the front of
+ each chunk and at the end. This makes consolidating fragmented
+ chunks into bigger chunks fast. The head fields also hold bits
+ representing whether chunks are free or in use.
+
+ Here are some pictures to make it clearer. They are "exploded" to
+ show that the state of a chunk can be thought of as extending from
+ the high 31 bits of the head field of its header through the
+ prev_foot and PINUSE_BIT bit of the following chunk header.
+
+ A chunk that's in use looks like:
+
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Size of previous chunk (if P = 0) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P|
+ | Size of this chunk 1| +-+
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | |
+ +- -+
+ | |
+ +- -+
+ | :
+ +- size - sizeof(size_t) available payload bytes -+
+ : |
+ chunk-> +- -+
+ | |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1|
+ | Size of next chunk (may or may not be in use) | +-+
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ And if it's free, it looks like this:
+
+ chunk-> +- -+
+ | User payload (must be in use, or we would have merged!) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |P|
+ | Size of this chunk 0| +-+
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Next pointer |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Prev pointer |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | :
+ +- size - sizeof(struct chunk) unused bytes -+
+ : |
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Size of this chunk |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0|
+ | Size of next chunk (must be in use, or we would have merged)| +-+
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | :
+ +- User payload -+
+ : |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |0|
+ +-+
+ Note that since we always merge adjacent free chunks, the chunks
+ adjacent to a free chunk must be in use.
+
+ Given a pointer to a chunk (which can be derived trivially from the
+ payload pointer) we can, in O(1) time, find out whether the adjacent
+ chunks are free, and if so, unlink them from the lists that they
+ are on and merge them with the current chunk.
+
+ Chunks always begin on even word boundaries, so the mem portion
+ (which is returned to the user) is also on an even word boundary, and
+ thus at least double-word aligned.
+
+ The P (PINUSE_BIT) bit, stored in the unused low-order bit of the
+ chunk size (which is always a multiple of two words), is an in-use
+ bit for the *previous* chunk. If that bit is *clear*, then the
+ word before the current chunk size contains the previous chunk
+ size, and can be used to find the front of the previous chunk.
+ The very first chunk allocated always has this bit set, preventing
+ access to non-existent (or non-owned) memory. If pinuse is set for
+ any given chunk, then you CANNOT determine the size of the
+ previous chunk, and might even get a memory addressing fault when
+ trying to do so.
+
+ The C (CINUSE_BIT) bit, stored in the unused second-lowest bit of
+ the chunk size redundantly records whether the current chunk is
+ inuse (unless the chunk is mmapped). This redundancy enables usage
+ checks within free and realloc, and reduces indirection when freeing
+ and consolidating chunks.
+
+ Each freshly allocated chunk must have both cinuse and pinuse set.
+ That is, each allocated chunk borders either a previously allocated
+ and still in-use chunk, or the base of its memory arena. This is
+ ensured by making all allocations from the `lowest' part of any
+ found chunk. Further, no free chunk physically borders another one,
+ so each free chunk is known to be preceded and followed by either
+ inuse chunks or the ends of memory.
+
+ Note that the `foot' of the current chunk is actually represented
+ as the prev_foot of the NEXT chunk. This makes it easier to
+ deal with alignments etc but can be very confusing when trying
+ to extend or adapt this code.
+
+ The exceptions to all this are
+
+ 1. The special chunk `top' is the top-most available chunk (i.e.,
+ the one bordering the end of available memory). It is treated
+ specially. Top is never included in any bin, is used only if
+ no other chunk is available, and is released back to the
+ system if it is very large (see M_TRIM_THRESHOLD). In effect,
+ the top chunk is treated as larger (and thus less well
+ fitting) than any other available chunk. The top chunk
+ doesn't update its trailing size field since there is no next
+ contiguous chunk that would have to index off it. However,
+ space is still allocated for it (TOP_FOOT_SIZE) to enable
+ separation or merging when space is extended.
+
+ 3. Chunks allocated via mmap, have both cinuse and pinuse bits
+ cleared in their head fields. Because they are allocated
+ one-by-one, each must carry its own prev_foot field, which is
+ also used to hold the offset this chunk has within its mmapped
+ region, which is needed to preserve alignment. Each mmapped
+ chunk is trailed by the first two fields of a fake next-chunk
+ for sake of usage checks.
+
+*/
+
+struct malloc_chunk {
+ size_t prev_foot; /* Size of previous chunk (if free). */
+ size_t head; /* Size and inuse bits. */
+ struct malloc_chunk* fd; /* double links -- used only if free. */
+ struct malloc_chunk* bk;
+};
+
+typedef struct malloc_chunk mchunk;
+typedef struct malloc_chunk* mchunkptr;
+typedef struct malloc_chunk* sbinptr; /* The type of bins of chunks */
+typedef unsigned int bindex_t; /* Described below */
+typedef unsigned int binmap_t; /* Described below */
+typedef unsigned int flag_t; /* The type of various bit flag sets */
+
+/* ------------------- Chunks sizes and alignments ----------------------- */
+
+#define MCHUNK_SIZE (sizeof(mchunk))
+
+#if FOOTERS
+#define CHUNK_OVERHEAD (TWO_SIZE_T_SIZES)
+#else /* FOOTERS */
+#define CHUNK_OVERHEAD (SIZE_T_SIZE)
+#endif /* FOOTERS */
+
+/* MMapped chunks need a second word of overhead ... */
+#define MMAP_CHUNK_OVERHEAD (TWO_SIZE_T_SIZES)
+/* ... and additional padding for fake next-chunk at foot */
+#define MMAP_FOOT_PAD (FOUR_SIZE_T_SIZES)
+
+/* The smallest size we can malloc is an aligned minimal chunk */
+#define MIN_CHUNK_SIZE\
+ ((MCHUNK_SIZE + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK)
+
+/* conversion from malloc headers to user pointers, and back */
+#define chunk2mem(p) ((void*)((char*)(p) + TWO_SIZE_T_SIZES))
+#define mem2chunk(mem) ((mchunkptr)((char*)(mem) - TWO_SIZE_T_SIZES))
+/* chunk associated with aligned address A */
+#define align_as_chunk(A) (mchunkptr)((A) + align_offset(chunk2mem(A)))
+
+/* Bounds on request (not chunk) sizes. */
+#define MAX_REQUEST ((-MIN_CHUNK_SIZE) << 2)
+#define MIN_REQUEST (MIN_CHUNK_SIZE - CHUNK_OVERHEAD - SIZE_T_ONE)
+
+/* pad request bytes into a usable size */
+#define pad_request(req) \
+ (((req) + CHUNK_OVERHEAD + CHUNK_ALIGN_MASK) & ~CHUNK_ALIGN_MASK)
+
+/* pad request, checking for minimum (but not maximum) */
+#define request2size(req) \
+ (((req) < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(req))
+
+
+/* ------------------ Operations on head and foot fields ----------------- */
+
+/*
+ The head field of a chunk is or'ed with PINUSE_BIT when previous
+ adjacent chunk in use, and or'ed with CINUSE_BIT if this chunk is in
+ use, unless mmapped, in which case both bits are cleared.
+
+ FLAG4_BIT is not used by this malloc, but might be useful in extensions.
+*/
+
+#define PINUSE_BIT (SIZE_T_ONE)
+#define CINUSE_BIT (SIZE_T_TWO)
+#define FLAG4_BIT (SIZE_T_FOUR)
+#define INUSE_BITS (PINUSE_BIT|CINUSE_BIT)
+#define FLAG_BITS (PINUSE_BIT|CINUSE_BIT|FLAG4_BIT)
+
+/* Head value for fenceposts */
+#define FENCEPOST_HEAD (INUSE_BITS|SIZE_T_SIZE)
+
+/* extraction of fields from head words */
+#define cinuse(p) ((p)->head & CINUSE_BIT)
+#define pinuse(p) ((p)->head & PINUSE_BIT)
+#define flag4inuse(p) ((p)->head & FLAG4_BIT)
+#define is_inuse(p) (((p)->head & INUSE_BITS) != PINUSE_BIT)
+#define is_mmapped(p) (((p)->head & INUSE_BITS) == 0)
+
+#define chunksize(p) ((p)->head & ~(FLAG_BITS))
+
+#define clear_pinuse(p) ((p)->head &= ~PINUSE_BIT)
+#define set_flag4(p) ((p)->head |= FLAG4_BIT)
+#define clear_flag4(p) ((p)->head &= ~FLAG4_BIT)
+
+/* Treat space at ptr +/- offset as a chunk */
+#define chunk_plus_offset(p, s) ((mchunkptr)(((char*)(p)) + (s)))
+#define chunk_minus_offset(p, s) ((mchunkptr)(((char*)(p)) - (s)))
+
+/* Ptr to next or previous physical malloc_chunk. */
+#define next_chunk(p) ((mchunkptr)( ((char*)(p)) + ((p)->head & ~FLAG_BITS)))
+#define prev_chunk(p) ((mchunkptr)( ((char*)(p)) - ((p)->prev_foot) ))
+
+/* extract next chunk's pinuse bit */
+#define next_pinuse(p) ((next_chunk(p)->head) & PINUSE_BIT)
+
+/* Get/set size at footer */
+#define get_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot)
+#define set_foot(p, s) (((mchunkptr)((char*)(p) + (s)))->prev_foot = (s))
+
+/* Set size, pinuse bit, and foot */
+#define set_size_and_pinuse_of_free_chunk(p, s)\
+ ((p)->head = (s|PINUSE_BIT), set_foot(p, s))
+
+/* Set size, pinuse bit, foot, and clear next pinuse */
+#define set_free_with_pinuse(p, s, n)\
+ (clear_pinuse(n), set_size_and_pinuse_of_free_chunk(p, s))
+
+/* Get the internal overhead associated with chunk p */
+#define overhead_for(p)\
+ (is_mmapped(p)? MMAP_CHUNK_OVERHEAD : CHUNK_OVERHEAD)
+
+/* Return true if malloced space is not necessarily cleared */
+#if MMAP_CLEARS
+#define calloc_must_clear(p) (!is_mmapped(p))
+#else /* MMAP_CLEARS */
+#define calloc_must_clear(p) (1)
+#endif /* MMAP_CLEARS */
+
+/* ---------------------- Overlaid data structures ----------------------- */
+
+/*
+ When chunks are not in use, they are treated as nodes of either
+ lists or trees.
+
+ "Small" chunks are stored in circular doubly-linked lists, and look
+ like this:
+
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Size of previous chunk |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ `head:' | Size of chunk, in bytes |P|
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Forward pointer to next chunk in list |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Back pointer to previous chunk in list |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Unused space (may be 0 bytes long) .
+ . .
+ . |
+nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ `foot:' | Size of chunk, in bytes |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ Larger chunks are kept in a form of bitwise digital trees (aka
+ tries) keyed on chunksizes. Because malloc_tree_chunks are only for
+ free chunks greater than 256 bytes, their size doesn't impose any
+ constraints on user chunk sizes. Each node looks like:
+
+ chunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Size of previous chunk |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ `head:' | Size of chunk, in bytes |P|
+ mem-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Forward pointer to next chunk of same size |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Back pointer to previous chunk of same size |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Pointer to left child (child[0]) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Pointer to right child (child[1]) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Pointer to parent |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | bin index of this chunk |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Unused space .
+ . |
+nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ `foot:' | Size of chunk, in bytes |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ Each tree holding treenodes is a tree of unique chunk sizes. Chunks
+ of the same size are arranged in a circularly-linked list, with only
+ the oldest chunk (the next to be used, in our FIFO ordering)
+ actually in the tree. (Tree members are distinguished by a non-null
+ parent pointer.) If a chunk with the same size an an existing node
+ is inserted, it is linked off the existing node using pointers that
+ work in the same way as fd/bk pointers of small chunks.
+
+ Each tree contains a power of 2 sized range of chunk sizes (the
+ smallest is 0x100 <= x < 0x180), which is is divided in half at each
+ tree level, with the chunks in the smaller half of the range (0x100
+ <= x < 0x140 for the top nose) in the left subtree and the larger
+ half (0x140 <= x < 0x180) in the right subtree. This is, of course,
+ done by inspecting individual bits.
+
+ Using these rules, each node's left subtree contains all smaller
+ sizes than its right subtree. However, the node at the root of each
+ subtree has no particular ordering relationship to either. (The
+ dividing line between the subtree sizes is based on trie relation.)
+ If we remove the last chunk of a given size from the interior of the
+ tree, we need to replace it with a leaf node. The tree ordering
+ rules permit a node to be replaced by any leaf below it.
+
+ The smallest chunk in a tree (a common operation in a best-fit
+ allocator) can be found by walking a path to the leftmost leaf in
+ the tree. Unlike a usual binary tree, where we follow left child
+ pointers until we reach a null, here we follow the right child
+ pointer any time the left one is null, until we reach a leaf with
+ both child pointers null. The smallest chunk in the tree will be
+ somewhere along that path.
+
+ The worst case number of steps to add, find, or remove a node is
+ bounded by the number of bits differentiating chunks within
+ bins. Under current bin calculations, this ranges from 6 up to 21
+ (for 32 bit sizes) or up to 53 (for 64 bit sizes). The typical case
+ is of course much better.
+*/
+
+struct malloc_tree_chunk {
+ /* The first four fields must be compatible with malloc_chunk */
+ size_t prev_foot;
+ size_t head;
+ struct malloc_tree_chunk* fd;
+ struct malloc_tree_chunk* bk;
+
+ struct malloc_tree_chunk* child[2];
+ struct malloc_tree_chunk* parent;
+ bindex_t index;
+};
+
+typedef struct malloc_tree_chunk tchunk;
+typedef struct malloc_tree_chunk* tchunkptr;
+typedef struct malloc_tree_chunk* tbinptr; /* The type of bins of trees */
+
+/* A little helper macro for trees */
+#define leftmost_child(t) ((t)->child[0] != 0? (t)->child[0] : (t)->child[1])
+
+/* ----------------------------- Segments -------------------------------- */
+
+/*
+ Each malloc space may include non-contiguous segments, held in a
+ list headed by an embedded malloc_segment record representing the
+ top-most space. Segments also include flags holding properties of
+ the space. Large chunks that are directly allocated by mmap are not
+ included in this list. They are instead independently created and
+ destroyed without otherwise keeping track of them.
+
+ Segment management mainly comes into play for spaces allocated by
+ MMAP. Any call to MMAP might or might not return memory that is
+ adjacent to an existing segment. MORECORE normally contiguously
+ extends the current space, so this space is almost always adjacent,
+ which is simpler and faster to deal with. (This is why MORECORE is
+ used preferentially to MMAP when both are available -- see
+ sys_alloc.) When allocating using MMAP, we don't use any of the
+ hinting mechanisms (inconsistently) supported in various
+ implementations of unix mmap, or distinguish reserving from
+ committing memory. Instead, we just ask for space, and exploit
+ contiguity when we get it. It is probably possible to do
+ better than this on some systems, but no general scheme seems
+ to be significantly better.
+
+ Management entails a simpler variant of the consolidation scheme
+ used for chunks to reduce fragmentation -- new adjacent memory is
+ normally prepended or appended to an existing segment. However,
+ there are limitations compared to chunk consolidation that mostly
+ reflect the fact that segment processing is relatively infrequent
+ (occurring only when getting memory from system) and that we
+ don't expect to have huge numbers of segments:
+
+ * Segments are not indexed, so traversal requires linear scans. (It
+ would be possible to index these, but is not worth the extra
+ overhead and complexity for most programs on most platforms.)
+ * New segments are only appended to old ones when holding top-most
+ memory; if they cannot be prepended to others, they are held in
+ different segments.
+
+ Except for the top-most segment of an mstate, each segment record
+ is kept at the tail of its segment. Segments are added by pushing
+ segment records onto the list headed by &mstate.seg for the
+ containing mstate.
+
+ Segment flags control allocation/merge/deallocation policies:
+ * If EXTERN_BIT set, then we did not allocate this segment,
+ and so should not try to deallocate or merge with others.
+ (This currently holds only for the initial segment passed
+ into create_mspace_with_base.)
+ * If USE_MMAP_BIT set, the segment may be merged with
+ other surrounding mmapped segments and trimmed/de-allocated
+ using munmap.
+ * If neither bit is set, then the segment was obtained using
+ MORECORE so can be merged with surrounding MORECORE'd segments
+ and deallocated/trimmed using MORECORE with negative arguments.
+*/
+
+struct malloc_segment {
+ char* base; /* base address */
+ size_t size; /* allocated size */
+ struct malloc_segment* next; /* ptr to next segment */
+ flag_t sflags; /* mmap and extern flag */
+};
+
+#define is_mmapped_segment(S) ((S)->sflags & USE_MMAP_BIT)
+#define is_extern_segment(S) ((S)->sflags & EXTERN_BIT)
+
+typedef struct malloc_segment msegment;
+typedef struct malloc_segment* msegmentptr;
+
+/* ---------------------------- malloc_state ----------------------------- */
+
+/*
+ A malloc_state holds all of the bookkeeping for a space.
+ The main fields are:
+
+ Top
+ The topmost chunk of the currently active segment. Its size is
+ cached in topsize. The actual size of topmost space is
+ topsize+TOP_FOOT_SIZE, which includes space reserved for adding
+ fenceposts and segment records if necessary when getting more
+ space from the system. The size at which to autotrim top is
+ cached from mparams in trim_check, except that it is disabled if
+ an autotrim fails.
+
+ Designated victim (dv)
+ This is the preferred chunk for servicing small requests that
+ don't have exact fits. It is normally the chunk split off most
+ recently to service another small request. Its size is cached in
+ dvsize. The link fields of this chunk are not maintained since it
+ is not kept in a bin.
+
+ SmallBins
+ An array of bin headers for free chunks. These bins hold chunks
+ with sizes less than MIN_LARGE_SIZE bytes. Each bin contains
+ chunks of all the same size, spaced 8 bytes apart. To simplify
+ use in double-linked lists, each bin header acts as a malloc_chunk
+ pointing to the real first node, if it exists (else pointing to
+ itself). This avoids special-casing for headers. But to avoid
+ waste, we allocate only the fd/bk pointers of bins, and then use
+ repositioning tricks to treat these as the fields of a chunk.
+
+ TreeBins
+ Treebins are pointers to the roots of trees holding a range of
+ sizes. There are 2 equally spaced treebins for each power of two
+ from TREE_SHIFT to TREE_SHIFT+16. The last bin holds anything
+ larger.
+
+ Bin maps
+ There is one bit map for small bins ("smallmap") and one for
+ treebins ("treemap). Each bin sets its bit when non-empty, and
+ clears the bit when empty. Bit operations are then used to avoid
+ bin-by-bin searching -- nearly all "search" is done without ever
+ looking at bins that won't be selected. The bit maps
+ conservatively use 32 bits per map word, even if on 64bit system.
+ For a good description of some of the bit-based techniques used
+ here, see Henry S. Warren Jr's book "Hacker's Delight" (and
+ supplement at http://hackersdelight.org/). Many of these are
+ intended to reduce the branchiness of paths through malloc etc, as
+ well as to reduce the number of memory locations read or written.
+
+ Segments
+ A list of segments headed by an embedded malloc_segment record
+ representing the initial space.
+
+ Address check support
+ The least_addr field is the least address ever obtained from
+ MORECORE or MMAP. Attempted frees and reallocs of any address less
+ than this are trapped (unless INSECURE is defined).
+
+ Magic tag
+ A cross-check field that should always hold same value as mparams.magic.
+
+ Max allowed footprint
+ The maximum allowed bytes to allocate from system (zero means no limit)
+
+ Flags
+ Bits recording whether to use MMAP, locks, or contiguous MORECORE
+
+ Statistics
+ Each space keeps track of current and maximum system memory
+ obtained via MORECORE or MMAP.
+
+ Trim support
+ Fields holding the amount of unused topmost memory that should trigger
+ trimming, and a counter to force periodic scanning to release unused
+ non-topmost segments.
+
+ Locking
+ If USE_LOCKS is defined, the "mutex" lock is acquired and released
+ around every public call using this mspace.
+
+ Extension support
+ A void* pointer and a size_t field that can be used to help implement
+ extensions to this malloc.
+*/
+
+/* Bin types, widths and sizes */
+#define NSMALLBINS (32U)
+#define NTREEBINS (32U)
+#define SMALLBIN_SHIFT (3U)
+#define SMALLBIN_WIDTH (SIZE_T_ONE << SMALLBIN_SHIFT)
+#define TREEBIN_SHIFT (8U)
+#define MIN_LARGE_SIZE (SIZE_T_ONE << TREEBIN_SHIFT)
+#define MAX_SMALL_SIZE (MIN_LARGE_SIZE - SIZE_T_ONE)
+#define MAX_SMALL_REQUEST (MAX_SMALL_SIZE - CHUNK_ALIGN_MASK - CHUNK_OVERHEAD)
+
+struct malloc_state {
+ binmap_t smallmap;
+ binmap_t treemap;
+ size_t dvsize;
+ size_t topsize;
+ char* least_addr;
+ mchunkptr dv;
+ mchunkptr top;
+ size_t trim_check;
+ size_t release_checks;
+ size_t magic;
+ mchunkptr smallbins[(NSMALLBINS+1)*2];
+ tbinptr treebins[NTREEBINS];
+ size_t footprint;
+ size_t max_footprint;
+ size_t footprint_limit; /* zero means no limit */
+ flag_t mflags;
+#if USE_LOCKS
+ MLOCK_T mutex; /* locate lock among fields that rarely change */
+#endif /* USE_LOCKS */
+ msegment seg;
+ void* extp; /* Unused but available for extensions */
+ size_t exts;
+};
+
+typedef struct malloc_state* mstate;
+
+/* ------------- Global malloc_state and malloc_params ------------------- */
+
+/*
+ malloc_params holds global properties, including those that can be
+ dynamically set using mallopt. There is a single instance, mparams,
+ initialized in init_mparams. Note that the non-zeroness of "magic"
+ also serves as an initialization flag.
+*/
+
+struct malloc_params {
+ size_t magic;
+ size_t page_size;
+ size_t granularity;
+ size_t mmap_threshold;
+ size_t trim_threshold;
+ flag_t default_mflags;
+};
+
+static struct malloc_params mparams;
+
+/* Ensure mparams initialized */
+#define ensure_initialization() (void)(mparams.magic != 0 || init_mparams())
+
+#if !ONLY_MSPACES
+
+/* The global malloc_state used for all non-"mspace" calls */
+static struct malloc_state _gm_;
+#define gm (&_gm_)
+#define is_global(M) ((M) == &_gm_)
+
+#endif /* !ONLY_MSPACES */
+
+#define is_initialized(M) ((M)->top != 0)
+
+/* -------------------------- system alloc setup ------------------------- */
+
+/* Operations on mflags */
+
+#define use_lock(M) ((M)->mflags & USE_LOCK_BIT)
+#define enable_lock(M) ((M)->mflags |= USE_LOCK_BIT)
+#if USE_LOCKS
+#define disable_lock(M) ((M)->mflags &= ~USE_LOCK_BIT)
+#else
+#define disable_lock(M)
+#endif
+
+#define use_mmap(M) ((M)->mflags & USE_MMAP_BIT)
+#define enable_mmap(M) ((M)->mflags |= USE_MMAP_BIT)
+#if HAVE_MMAP
+#define disable_mmap(M) ((M)->mflags &= ~USE_MMAP_BIT)
+#else
+#define disable_mmap(M)
+#endif
+
+#define use_noncontiguous(M) ((M)->mflags & USE_NONCONTIGUOUS_BIT)
+#define disable_contiguous(M) ((M)->mflags |= USE_NONCONTIGUOUS_BIT)
+
+#define set_lock(M,L)\
+ ((M)->mflags = (L)?\
+ ((M)->mflags | USE_LOCK_BIT) :\
+ ((M)->mflags & ~USE_LOCK_BIT))
+
+/* page-align a size */
+#define page_align(S)\
+ (((S) + (mparams.page_size - SIZE_T_ONE)) & ~(mparams.page_size - SIZE_T_ONE))
+
+/* granularity-align a size */
+#define granularity_align(S)\
+ (((S) + (mparams.granularity - SIZE_T_ONE))\
+ & ~(mparams.granularity - SIZE_T_ONE))
+
+
+/* For mmap, use granularity alignment on windows, else page-align */
+#ifdef WIN32
+#define mmap_align(S) granularity_align(S)
+#else
+#define mmap_align(S) page_align(S)
+#endif
+
+/* For sys_alloc, enough padding to ensure can malloc request on success */
+#define SYS_ALLOC_PADDING (TOP_FOOT_SIZE + MALLOC_ALIGNMENT)
+
+#define is_page_aligned(S)\
+ (((size_t)(S) & (mparams.page_size - SIZE_T_ONE)) == 0)
+#define is_granularity_aligned(S)\
+ (((size_t)(S) & (mparams.granularity - SIZE_T_ONE)) == 0)
+
+/* True if segment S holds address A */
+#define segment_holds(S, A)\
+ ((char*)(A) >= S->base && (char*)(A) < S->base + S->size)
+
+/* Return segment holding given address */
+static msegmentptr segment_holding(mstate m, char* addr) {
+ msegmentptr sp = &m->seg;
+ for (;;) {
+ if (addr >= sp->base && addr < sp->base + sp->size)
+ return sp;
+ if ((sp = sp->next) == 0)
+ return 0;
+ }
+}
+
+/* Return true if segment contains a segment link */
+static int has_segment_link(mstate m, msegmentptr ss) {
+ msegmentptr sp = &m->seg;
+ for (;;) {
+ if ((char*)sp >= ss->base && (char*)sp < ss->base + ss->size)
+ return 1;
+ if ((sp = sp->next) == 0)
+ return 0;
+ }
+}
+
+#ifndef MORECORE_CANNOT_TRIM
+#define should_trim(M,s) ((s) > (M)->trim_check)
+#else /* MORECORE_CANNOT_TRIM */
+#define should_trim(M,s) (0)
+#endif /* MORECORE_CANNOT_TRIM */
+
+/*
+ TOP_FOOT_SIZE is padding at the end of a segment, including space
+ that may be needed to place segment records and fenceposts when new
+ noncontiguous segments are added.
+*/
+#define TOP_FOOT_SIZE\
+ (align_offset(chunk2mem(0))+pad_request(sizeof(struct malloc_segment))+MIN_CHUNK_SIZE)
+
+
+/* ------------------------------- Hooks -------------------------------- */
+
+/*
+ PREACTION should be defined to return 0 on success, and nonzero on
+ failure. If you are not using locking, you can redefine these to do
+ anything you like.
+*/
+
+#if USE_LOCKS
+#define PREACTION(M) ((use_lock(M))? ACQUIRE_LOCK(&(M)->mutex) : 0)
+#define POSTACTION(M) { if (use_lock(M)) RELEASE_LOCK(&(M)->mutex); }
+#else /* USE_LOCKS */
+
+#ifndef PREACTION
+#define PREACTION(M) (0)
+#endif /* PREACTION */
+
+#ifndef POSTACTION
+#define POSTACTION(M)
+#endif /* POSTACTION */
+
+#endif /* USE_LOCKS */
+
+/*
+ CORRUPTION_ERROR_ACTION is triggered upon detected bad addresses.
+ USAGE_ERROR_ACTION is triggered on detected bad frees and
+ reallocs. The argument p is an address that might have triggered the
+ fault. It is ignored by the two predefined actions, but might be
+ useful in custom actions that try to help diagnose errors.
+*/
+
+#if PROCEED_ON_ERROR
+
+/* A count of the number of corruption errors causing resets */
+int malloc_corruption_error_count;
+
+/* default corruption action */
+static void reset_on_error(mstate m);
+
+#define CORRUPTION_ERROR_ACTION(m) reset_on_error(m)
+#define USAGE_ERROR_ACTION(m, p)
+
+#else /* PROCEED_ON_ERROR */
+
+#ifndef CORRUPTION_ERROR_ACTION
+#define CORRUPTION_ERROR_ACTION(m) ABORT
+#endif /* CORRUPTION_ERROR_ACTION */
+
+#ifndef USAGE_ERROR_ACTION
+#define USAGE_ERROR_ACTION(m,p) ABORT
+#endif /* USAGE_ERROR_ACTION */
+
+#endif /* PROCEED_ON_ERROR */
+
+
+/* -------------------------- Debugging setup ---------------------------- */
+
+#if ! DEBUG
+
+#define check_free_chunk(M,P)
+#define check_inuse_chunk(M,P)
+#define check_malloced_chunk(M,P,N)
+#define check_mmapped_chunk(M,P)
+#define check_malloc_state(M)
+#define check_top_chunk(M,P)
+
+#else /* DEBUG */
+#define check_free_chunk(M,P) do_check_free_chunk(M,P)
+#define check_inuse_chunk(M,P) do_check_inuse_chunk(M,P)
+#define check_top_chunk(M,P) do_check_top_chunk(M,P)
+#define check_malloced_chunk(M,P,N) do_check_malloced_chunk(M,P,N)
+#define check_mmapped_chunk(M,P) do_check_mmapped_chunk(M,P)
+#define check_malloc_state(M) do_check_malloc_state(M)
+
+static void do_check_any_chunk(mstate m, mchunkptr p);
+static void do_check_top_chunk(mstate m, mchunkptr p);
+static void do_check_mmapped_chunk(mstate m, mchunkptr p);
+static void do_check_inuse_chunk(mstate m, mchunkptr p);
+static void do_check_free_chunk(mstate m, mchunkptr p);
+static void do_check_malloced_chunk(mstate m, void* mem, size_t s);
+static void do_check_tree(mstate m, tchunkptr t);
+static void do_check_treebin(mstate m, bindex_t i);
+static void do_check_smallbin(mstate m, bindex_t i);
+static void do_check_malloc_state(mstate m);
+static int bin_find(mstate m, mchunkptr x);
+static size_t traverse_and_check(mstate m);
+#endif /* DEBUG */
+
+/* ---------------------------- Indexing Bins ---------------------------- */
+
+#define is_small(s) (((s) >> SMALLBIN_SHIFT) < NSMALLBINS)
+#define small_index(s) (bindex_t)((s) >> SMALLBIN_SHIFT)
+#define small_index2size(i) ((i) << SMALLBIN_SHIFT)
+#define MIN_SMALL_INDEX (small_index(MIN_CHUNK_SIZE))
+
+/* addressing by index. See above about smallbin repositioning */
+#define smallbin_at(M, i) ((sbinptr)((char*)&((M)->smallbins[(i)<<1])))
+#define treebin_at(M,i) (&((M)->treebins[i]))
+
+/* assign tree index for size S to variable I. Use x86 asm if possible */
+#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+#define compute_tree_index(S, I)\
+{\
+ unsigned int X = S >> TREEBIN_SHIFT;\
+ if (X == 0)\
+ I = 0;\
+ else if (X > 0xFFFF)\
+ I = NTREEBINS-1;\
+ else {\
+ unsigned int K = (unsigned) sizeof(X)*__CHAR_BIT__ - 1 - (unsigned) __builtin_clz(X); \
+ I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\
+ }\
+}
+
+#elif defined (__INTEL_COMPILER)
+#define compute_tree_index(S, I)\
+{\
+ size_t X = S >> TREEBIN_SHIFT;\
+ if (X == 0)\
+ I = 0;\
+ else if (X > 0xFFFF)\
+ I = NTREEBINS-1;\
+ else {\
+ unsigned int K = _bit_scan_reverse (X); \
+ I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\
+ }\
+}
+
+#elif defined(_MSC_VER) && _MSC_VER>=1300
+#define compute_tree_index(S, I)\
+{\
+ size_t X = S >> TREEBIN_SHIFT;\
+ if (X == 0)\
+ I = 0;\
+ else if (X > 0xFFFF)\
+ I = NTREEBINS-1;\
+ else {\
+ unsigned int K;\
+ _BitScanReverse((DWORD *) &K, (DWORD) X);\
+ I = (bindex_t)((K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1)));\
+ }\
+}
+
+#else /* GNUC */
+#define compute_tree_index(S, I)\
+{\
+ size_t X = S >> TREEBIN_SHIFT;\
+ if (X == 0)\
+ I = 0;\
+ else if (X > 0xFFFF)\
+ I = NTREEBINS-1;\
+ else {\
+ unsigned int Y = (unsigned int)X;\
+ unsigned int N = ((Y - 0x100) >> 16) & 8;\
+ unsigned int K = (((Y <<= N) - 0x1000) >> 16) & 4;\
+ N += K;\
+ N += K = (((Y <<= K) - 0x4000) >> 16) & 2;\
+ K = 14 - N + ((Y <<= K) >> 15);\
+ I = (K << 1) + ((S >> (K + (TREEBIN_SHIFT-1)) & 1));\
+ }\
+}
+#endif /* GNUC */
+
+/* Bit representing maximum resolved size in a treebin at i */
+#define bit_for_tree_index(i) \
+ (i == NTREEBINS-1)? (SIZE_T_BITSIZE-1) : (((i) >> 1) + TREEBIN_SHIFT - 2)
+
+/* Shift placing maximum resolved bit in a treebin at i as sign bit */
+#define leftshift_for_tree_index(i) \
+ ((i == NTREEBINS-1)? 0 : \
+ ((SIZE_T_BITSIZE-SIZE_T_ONE) - (((i) >> 1) + TREEBIN_SHIFT - 2)))
+
+/* The size of the smallest chunk held in bin with index i */
+#define minsize_for_tree_index(i) \
+ ((SIZE_T_ONE << (((i) >> 1) + TREEBIN_SHIFT)) | \
+ (((size_t)((i) & SIZE_T_ONE)) << (((i) >> 1) + TREEBIN_SHIFT - 1)))
+
+
+/* ------------------------ Operations on bin maps ----------------------- */
+
+/* bit corresponding to given index */
+#define idx2bit(i) ((binmap_t)(1) << (i))
+
+/* Mark/Clear bits with given index */
+#define mark_smallmap(M,i) ((M)->smallmap |= idx2bit(i))
+#define clear_smallmap(M,i) ((M)->smallmap &= ~idx2bit(i))
+#define smallmap_is_marked(M,i) ((M)->smallmap & idx2bit(i))
+
+#define mark_treemap(M,i) ((M)->treemap |= idx2bit(i))
+#define clear_treemap(M,i) ((M)->treemap &= ~idx2bit(i))
+#define treemap_is_marked(M,i) ((M)->treemap & idx2bit(i))
+
+/* isolate the least set bit of a bitmap */
+#define least_bit(x) ((x) & -(x))
+
+/* mask with all bits to left of least bit of x on */
+#define left_bits(x) ((x<<1) | -(x<<1))
+
+/* mask with all bits to left of or equal to least bit of x on */
+#define same_or_left_bits(x) ((x) | -(x))
+
+/* index corresponding to given bit. Use x86 asm if possible */
+
+#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+#define compute_bit2idx(X, I)\
+{\
+ unsigned int J;\
+ J = __builtin_ctz(X); \
+ I = (bindex_t)J;\
+}
+
+#elif defined (__INTEL_COMPILER)
+#define compute_bit2idx(X, I)\
+{\
+ unsigned int J;\
+ J = _bit_scan_forward (X); \
+ I = (bindex_t)J;\
+}
+
+#elif defined(_MSC_VER) && _MSC_VER>=1300
+#define compute_bit2idx(X, I)\
+{\
+ unsigned int J;\
+ _BitScanForward((DWORD *) &J, X);\
+ I = (bindex_t)J;\
+}
+
+#elif USE_BUILTIN_FFS
+#define compute_bit2idx(X, I) I = ffs(X)-1
+
+#else
+#define compute_bit2idx(X, I)\
+{\
+ unsigned int Y = X - 1;\
+ unsigned int K = Y >> (16-4) & 16;\
+ unsigned int N = K; Y >>= K;\
+ N += K = Y >> (8-3) & 8; Y >>= K;\
+ N += K = Y >> (4-2) & 4; Y >>= K;\
+ N += K = Y >> (2-1) & 2; Y >>= K;\
+ N += K = Y >> (1-0) & 1; Y >>= K;\
+ I = (bindex_t)(N + Y);\
+}
+#endif /* GNUC */
+
+
+/* ----------------------- Runtime Check Support ------------------------- */
+
+/*
+ For security, the main invariant is that malloc/free/etc never
+ writes to a static address other than malloc_state, unless static
+ malloc_state itself has been corrupted, which cannot occur via
+ malloc (because of these checks). In essence this means that we
+ believe all pointers, sizes, maps etc held in malloc_state, but
+ check all of those linked or offsetted from other embedded data
+ structures. These checks are interspersed with main code in a way
+ that tends to minimize their run-time cost.
+
+ When FOOTERS is defined, in addition to range checking, we also
+ verify footer fields of inuse chunks, which can be used guarantee
+ that the mstate controlling malloc/free is intact. This is a
+ streamlined version of the approach described by William Robertson
+ et al in "Run-time Detection of Heap-based Overflows" LISA'03
+ http://www.usenix.org/events/lisa03/tech/robertson.html The footer
+ of an inuse chunk holds the xor of its mstate and a random seed,
+ that is checked upon calls to free() and realloc(). This is
+ (probabalistically) unguessable from outside the program, but can be
+ computed by any code successfully malloc'ing any chunk, so does not
+ itself provide protection against code that has already broken
+ security through some other means. Unlike Robertson et al, we
+ always dynamically check addresses of all offset chunks (previous,
+ next, etc). This turns out to be cheaper than relying on hashes.
+*/
+
+#if !INSECURE
+/* Check if address a is at least as high as any from MORECORE or MMAP */
+#define ok_address(M, a) ((char*)(a) >= (M)->least_addr)
+/* Check if address of next chunk n is higher than base chunk p */
+#define ok_next(p, n) ((char*)(p) < (char*)(n))
+/* Check if p has inuse status */
+#define ok_inuse(p) is_inuse(p)
+/* Check if p has its pinuse bit on */
+#define ok_pinuse(p) pinuse(p)
+
+#else /* !INSECURE */
+#define ok_address(M, a) (1)
+#define ok_next(b, n) (1)
+#define ok_inuse(p) (1)
+#define ok_pinuse(p) (1)
+#endif /* !INSECURE */
+
+#if (FOOTERS && !INSECURE)
+/* Check if (alleged) mstate m has expected magic field */
+#define ok_magic(M) ((M)->magic == mparams.magic)
+#else /* (FOOTERS && !INSECURE) */
+#define ok_magic(M) (1)
+#endif /* (FOOTERS && !INSECURE) */
+
+/* In gcc, use __builtin_expect to minimize impact of checks */
+#if !INSECURE
+#if defined(__GNUC__) && __GNUC__ >= 3
+#define RTCHECK(e) __builtin_expect(e, 1)
+#else /* GNUC */
+#define RTCHECK(e) (e)
+#endif /* GNUC */
+#else /* !INSECURE */
+#define RTCHECK(e) (1)
+#endif /* !INSECURE */
+
+/* macros to set up inuse chunks with or without footers */
+
+#if !FOOTERS
+
+#define mark_inuse_foot(M,p,s)
+
+/* Macros for setting head/foot of non-mmapped chunks */
+
+/* Set cinuse bit and pinuse bit of next chunk */
+#define set_inuse(M,p,s)\
+ ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\
+ ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT)
+
+/* Set cinuse and pinuse of this chunk and pinuse of next chunk */
+#define set_inuse_and_pinuse(M,p,s)\
+ ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
+ ((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT)
+
+/* Set size, cinuse and pinuse bit of this chunk */
+#define set_size_and_pinuse_of_inuse_chunk(M, p, s)\
+ ((p)->head = (s|PINUSE_BIT|CINUSE_BIT))
+
+#else /* FOOTERS */
+
+/* Set foot of inuse chunk to be xor of mstate and seed */
+#define mark_inuse_foot(M,p,s)\
+ (((mchunkptr)((char*)(p) + (s)))->prev_foot = ((size_t)(M) ^ mparams.magic))
+
+#define get_mstate_for(p)\
+ ((mstate)(((mchunkptr)((char*)(p) +\
+ (chunksize(p))))->prev_foot ^ mparams.magic))
+
+#define set_inuse(M,p,s)\
+ ((p)->head = (((p)->head & PINUSE_BIT)|s|CINUSE_BIT),\
+ (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT), \
+ mark_inuse_foot(M,p,s))
+
+#define set_inuse_and_pinuse(M,p,s)\
+ ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
+ (((mchunkptr)(((char*)(p)) + (s)))->head |= PINUSE_BIT),\
+ mark_inuse_foot(M,p,s))
+
+#define set_size_and_pinuse_of_inuse_chunk(M, p, s)\
+ ((p)->head = (s|PINUSE_BIT|CINUSE_BIT),\
+ mark_inuse_foot(M, p, s))
+
+#endif /* !FOOTERS */
+
+/* ---------------------------- setting mparams -------------------------- */
+
+/* Initialize mparams */
+static int init_mparams(void) {
+#ifdef NEED_GLOBAL_LOCK_INIT
+ call_once(&malloc_global_mutex_init_once, init_malloc_global_mutex);
+#endif
+
+ ACQUIRE_MALLOC_GLOBAL_LOCK();
+ if (mparams.magic == 0) {
+ size_t magic;
+ size_t psize;
+ size_t gsize;
+
+#ifndef WIN32
+ psize = malloc_getpagesize;
+ gsize = ((DEFAULT_GRANULARITY != 0)? DEFAULT_GRANULARITY : psize);
+#else /* WIN32 */
+ {
+ SYSTEM_INFO system_info;
+ GetSystemInfo(&system_info);
+ psize = system_info.dwPageSize;
+ gsize = ((DEFAULT_GRANULARITY != 0)?
+ DEFAULT_GRANULARITY : system_info.dwAllocationGranularity);
+ }
+#endif /* WIN32 */
+
+ /* Sanity-check configuration:
+ size_t must be unsigned and as wide as pointer type.
+ ints must be at least 4 bytes.
+ alignment must be at least 8.
+ Alignment, min chunk size, and page size must all be powers of 2.
+ */
+ if ((sizeof(size_t) != sizeof(char*)) ||
+ (MAX_SIZE_T < MIN_CHUNK_SIZE) ||
+ (sizeof(int) < 4) ||
+ (MALLOC_ALIGNMENT < (size_t)8U) ||
+ ((MALLOC_ALIGNMENT & (MALLOC_ALIGNMENT-SIZE_T_ONE)) != 0) ||
+ ((MCHUNK_SIZE & (MCHUNK_SIZE-SIZE_T_ONE)) != 0) ||
+ ((gsize & (gsize-SIZE_T_ONE)) != 0) ||
+ ((psize & (psize-SIZE_T_ONE)) != 0))
+ ABORT;
+
+ mparams.granularity = gsize;
+ mparams.page_size = psize;
+ mparams.mmap_threshold = DEFAULT_MMAP_THRESHOLD;
+ mparams.trim_threshold = DEFAULT_TRIM_THRESHOLD;
+#if MORECORE_CONTIGUOUS
+ mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT;
+#else /* MORECORE_CONTIGUOUS */
+ mparams.default_mflags = USE_LOCK_BIT|USE_MMAP_BIT|USE_NONCONTIGUOUS_BIT;
+#endif /* MORECORE_CONTIGUOUS */
+
+#if !ONLY_MSPACES
+ /* Set up lock for main malloc area */
+ gm->mflags = mparams.default_mflags;
+ (void)INITIAL_LOCK(&gm->mutex);
+#endif
+
+ {
+#if USE_DEV_RANDOM
+ int fd;
+ unsigned char buf[sizeof(size_t)];
+ /* Try to use /dev/urandom, else fall back on using time */
+ if ((fd = open("/dev/urandom", O_RDONLY)) >= 0 &&
+ read(fd, buf, sizeof(buf)) == sizeof(buf)) {
+ magic = *((size_t *) buf);
+ close(fd);
+ }
+ else
+#endif /* USE_DEV_RANDOM */
+#ifdef WIN32
+ magic = (size_t)(GetTickCount() ^ (size_t)0x55555555U);
+#elif defined(LACKS_TIME_H)
+ magic = (size_t)&magic ^ (size_t)0x55555555U;
+#else
+ magic = (size_t)(time(0) ^ (size_t)0x55555555U);
+#endif
+ magic |= (size_t)8U; /* ensure nonzero */
+ magic &= ~(size_t)7U; /* improve chances of fault for bad values */
+ /* Until memory modes commonly available, use volatile-write */
+ (*(volatile size_t *)(&(mparams.magic))) = magic;
+ }
+ }
+
+ RELEASE_MALLOC_GLOBAL_LOCK();
+ return 1;
+}
+
+/* support for mallopt */
+static int change_mparam(int param_number, int value) {
+ size_t val;
+ ensure_initialization();
+ val = (value == -1)? MAX_SIZE_T : (size_t)value;
+ switch(param_number) {
+ case M_TRIM_THRESHOLD:
+ mparams.trim_threshold = val;
+ return 1;
+ case M_GRANULARITY:
+ if (val >= mparams.page_size && ((val & (val-1)) == 0)) {
+ mparams.granularity = val;
+ return 1;
+ }
+ else
+ return 0;
+ case M_MMAP_THRESHOLD:
+ mparams.mmap_threshold = val;
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+#if DEBUG
+/* ------------------------- Debugging Support --------------------------- */
+
+/* Check properties of any chunk, whether free, inuse, mmapped etc */
+static void do_check_any_chunk(mstate m, mchunkptr p) {
+ assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
+ assert(ok_address(m, p));
+}
+
+/* Check properties of top chunk */
+static void do_check_top_chunk(mstate m, mchunkptr p) {
+ msegmentptr sp = segment_holding(m, (char*)p);
+ size_t sz = p->head & ~INUSE_BITS; /* third-lowest bit can be set! */
+ assert(sp != 0);
+ assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
+ assert(ok_address(m, p));
+ assert(sz == m->topsize);
+ assert(sz > 0);
+ assert(sz == ((sp->base + sp->size) - (char*)p) - TOP_FOOT_SIZE);
+ assert(pinuse(p));
+ assert(!pinuse(chunk_plus_offset(p, sz)));
+}
+
+/* Check properties of (inuse) mmapped chunks */
+static void do_check_mmapped_chunk(mstate m, mchunkptr p) {
+ size_t sz = chunksize(p);
+ size_t len = (sz + (p->prev_foot) + MMAP_FOOT_PAD);
+ assert(is_mmapped(p));
+ assert(use_mmap(m));
+ assert((is_aligned(chunk2mem(p))) || (p->head == FENCEPOST_HEAD));
+ assert(ok_address(m, p));
+ assert(!is_small(sz));
+ assert((len & (mparams.page_size-SIZE_T_ONE)) == 0);
+ assert(chunk_plus_offset(p, sz)->head == FENCEPOST_HEAD);
+ assert(chunk_plus_offset(p, sz+SIZE_T_SIZE)->head == 0);
+}
+
+/* Check properties of inuse chunks */
+static void do_check_inuse_chunk(mstate m, mchunkptr p) {
+ do_check_any_chunk(m, p);
+ assert(is_inuse(p));
+ assert(next_pinuse(p));
+ /* If not pinuse and not mmapped, previous chunk has OK offset */
+ assert(is_mmapped(p) || pinuse(p) || next_chunk(prev_chunk(p)) == p);
+ if (is_mmapped(p))
+ do_check_mmapped_chunk(m, p);
+}
+
+/* Check properties of free chunks */
+static void do_check_free_chunk(mstate m, mchunkptr p) {
+ size_t sz = chunksize(p);
+ mchunkptr next = chunk_plus_offset(p, sz);
+ do_check_any_chunk(m, p);
+ assert(!is_inuse(p));
+ assert(!next_pinuse(p));
+ assert (!is_mmapped(p));
+ if (p != m->dv && p != m->top) {
+ if (sz >= MIN_CHUNK_SIZE) {
+ assert((sz & CHUNK_ALIGN_MASK) == 0);
+ assert(is_aligned(chunk2mem(p)));
+ assert(next->prev_foot == sz);
+ assert(pinuse(p));
+ assert (next == m->top || is_inuse(next));
+ assert(p->fd->bk == p);
+ assert(p->bk->fd == p);
+ }
+ else /* markers are always of size SIZE_T_SIZE */
+ assert(sz == SIZE_T_SIZE);
+ }
+}
+
+/* Check properties of malloced chunks at the point they are malloced */
+static void do_check_malloced_chunk(mstate m, void* mem, size_t s) {
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+ size_t sz = p->head & ~INUSE_BITS;
+ do_check_inuse_chunk(m, p);
+ assert((sz & CHUNK_ALIGN_MASK) == 0);
+ assert(sz >= MIN_CHUNK_SIZE);
+ assert(sz >= s);
+ /* unless mmapped, size is less than MIN_CHUNK_SIZE more than request */
+ assert(is_mmapped(p) || sz < (s + MIN_CHUNK_SIZE));
+ }
+}
+
+/* Check a tree and its subtrees. */
+static void do_check_tree(mstate m, tchunkptr t) {
+ tchunkptr head = 0;
+ tchunkptr u = t;
+ bindex_t tindex = t->index;
+ size_t tsize = chunksize(t);
+ bindex_t idx;
+ compute_tree_index(tsize, idx);
+ assert(tindex == idx);
+ assert(tsize >= MIN_LARGE_SIZE);
+ assert(tsize >= minsize_for_tree_index(idx));
+ assert((idx == NTREEBINS-1) || (tsize < minsize_for_tree_index((idx+1))));
+
+ do { /* traverse through chain of same-sized nodes */
+ do_check_any_chunk(m, ((mchunkptr)u));
+ assert(u->index == tindex);
+ assert(chunksize(u) == tsize);
+ assert(!is_inuse(u));
+ assert(!next_pinuse(u));
+ assert(u->fd->bk == u);
+ assert(u->bk->fd == u);
+ if (u->parent == 0) {
+ assert(u->child[0] == 0);
+ assert(u->child[1] == 0);
+ }
+ else {
+ assert(head == 0); /* only one node on chain has parent */
+ head = u;
+ assert(u->parent != u);
+ assert (u->parent->child[0] == u ||
+ u->parent->child[1] == u ||
+ *((tbinptr*)(u->parent)) == u);
+ if (u->child[0] != 0) {
+ assert(u->child[0]->parent == u);
+ assert(u->child[0] != u);
+ do_check_tree(m, u->child[0]);
+ }
+ if (u->child[1] != 0) {
+ assert(u->child[1]->parent == u);
+ assert(u->child[1] != u);
+ do_check_tree(m, u->child[1]);
+ }
+ if (u->child[0] != 0 && u->child[1] != 0) {
+ assert(chunksize(u->child[0]) < chunksize(u->child[1]));
+ }
+ }
+ u = u->fd;
+ } while (u != t);
+ assert(head != 0);
+}
+
+/* Check all the chunks in a treebin. */
+static void do_check_treebin(mstate m, bindex_t i) {
+ tbinptr* tb = treebin_at(m, i);
+ tchunkptr t = *tb;
+ int empty = (m->treemap & (1U << i)) == 0;
+ if (t == 0)
+ assert(empty);
+ if (!empty)
+ do_check_tree(m, t);
+}
+
+/* Check all the chunks in a smallbin. */
+static void do_check_smallbin(mstate m, bindex_t i) {
+ sbinptr b = smallbin_at(m, i);
+ mchunkptr p = b->bk;
+ unsigned int empty = (m->smallmap & (1U << i)) == 0;
+ if (p == b)
+ assert(empty);
+ if (!empty) {
+ for (; p != b; p = p->bk) {
+ size_t size = chunksize(p);
+ mchunkptr q;
+ /* each chunk claims to be free */
+ do_check_free_chunk(m, p);
+ /* chunk belongs in bin */
+ assert(small_index(size) == i);
+ assert(p->bk == b || chunksize(p->bk) == chunksize(p));
+ /* chunk is followed by an inuse chunk */
+ q = next_chunk(p);
+ if (q->head != FENCEPOST_HEAD)
+ do_check_inuse_chunk(m, q);
+ }
+ }
+}
+
+/* Find x in a bin. Used in other check functions. */
+static int bin_find(mstate m, mchunkptr x) {
+ size_t size = chunksize(x);
+ if (is_small(size)) {
+ bindex_t sidx = small_index(size);
+ sbinptr b = smallbin_at(m, sidx);
+ if (smallmap_is_marked(m, sidx)) {
+ mchunkptr p = b;
+ do {
+ if (p == x)
+ return 1;
+ } while ((p = p->fd) != b);
+ }
+ }
+ else {
+ bindex_t tidx;
+ compute_tree_index(size, tidx);
+ if (treemap_is_marked(m, tidx)) {
+ tchunkptr t = *treebin_at(m, tidx);
+ size_t sizebits = size << leftshift_for_tree_index(tidx);
+ while (t != 0 && chunksize(t) != size) {
+ t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1];
+ sizebits <<= 1;
+ }
+ if (t != 0) {
+ tchunkptr u = t;
+ do {
+ if (u == (tchunkptr)x)
+ return 1;
+ } while ((u = u->fd) != t);
+ }
+ }
+ }
+ return 0;
+}
+
+/* Traverse each chunk and check it; return total */
+static size_t traverse_and_check(mstate m) {
+ size_t sum = 0;
+ if (is_initialized(m)) {
+ msegmentptr s = &m->seg;
+ sum += m->topsize + TOP_FOOT_SIZE;
+ while (s != 0) {
+ mchunkptr q = align_as_chunk(s->base);
+ mchunkptr lastq = 0;
+ assert(pinuse(q));
+ while (segment_holds(s, q) &&
+ q != m->top && q->head != FENCEPOST_HEAD) {
+ sum += chunksize(q);
+ if (is_inuse(q)) {
+ assert(!bin_find(m, q));
+ do_check_inuse_chunk(m, q);
+ }
+ else {
+ assert(q == m->dv || bin_find(m, q));
+ assert(lastq == 0 || is_inuse(lastq)); /* Not 2 consecutive free */
+ do_check_free_chunk(m, q);
+ }
+ lastq = q;
+ q = next_chunk(q);
+ }
+ s = s->next;
+ }
+ }
+ return sum;
+}
+
+
+/* Check all properties of malloc_state. */
+static void do_check_malloc_state(mstate m) {
+ bindex_t i;
+ size_t total;
+ /* check bins */
+ for (i = 0; i < NSMALLBINS; ++i)
+ do_check_smallbin(m, i);
+ for (i = 0; i < NTREEBINS; ++i)
+ do_check_treebin(m, i);
+
+ if (m->dvsize != 0) { /* check dv chunk */
+ do_check_any_chunk(m, m->dv);
+ assert(m->dvsize == chunksize(m->dv));
+ assert(m->dvsize >= MIN_CHUNK_SIZE);
+ assert(bin_find(m, m->dv) == 0);
+ }
+
+ if (m->top != 0) { /* check top chunk */
+ do_check_top_chunk(m, m->top);
+ /*assert(m->topsize == chunksize(m->top)); redundant */
+ assert(m->topsize > 0);
+ assert(bin_find(m, m->top) == 0);
+ }
+
+ total = traverse_and_check(m);
+ assert(total <= m->footprint);
+ assert(m->footprint <= m->max_footprint);
+}
+#endif /* DEBUG */
+
+/* ----------------------------- statistics ------------------------------ */
+
+#if !NO_MALLINFO
+static struct mallinfo internal_mallinfo(mstate m) {
+ struct mallinfo nm = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+ ensure_initialization();
+ if (!PREACTION(m)) {
+ check_malloc_state(m);
+ if (is_initialized(m)) {
+ size_t nfree = SIZE_T_ONE; /* top always free */
+ size_t mfree = m->topsize + TOP_FOOT_SIZE;
+ size_t sum = mfree;
+ msegmentptr s = &m->seg;
+ while (s != 0) {
+ mchunkptr q = align_as_chunk(s->base);
+ while (segment_holds(s, q) &&
+ q != m->top && q->head != FENCEPOST_HEAD) {
+ size_t sz = chunksize(q);
+ sum += sz;
+ if (!is_inuse(q)) {
+ mfree += sz;
+ ++nfree;
+ }
+ q = next_chunk(q);
+ }
+ s = s->next;
+ }
+
+ nm.arena = sum;
+ nm.ordblks = nfree;
+ nm.hblkhd = m->footprint - sum;
+ nm.usmblks = m->max_footprint;
+ nm.uordblks = m->footprint - mfree;
+ nm.fordblks = mfree;
+ nm.keepcost = m->topsize;
+ }
+
+ POSTACTION(m);
+ }
+ return nm;
+}
+#endif /* !NO_MALLINFO */
+
+#if !NO_MALLOC_STATS
+static void internal_malloc_stats(mstate m) {
+ ensure_initialization();
+ if (!PREACTION(m)) {
+ size_t maxfp = 0;
+ size_t fp = 0;
+ size_t used = 0;
+ check_malloc_state(m);
+ if (is_initialized(m)) {
+ msegmentptr s = &m->seg;
+ maxfp = m->max_footprint;
+ fp = m->footprint;
+ used = fp - (m->topsize + TOP_FOOT_SIZE);
+
+ while (s != 0) {
+ mchunkptr q = align_as_chunk(s->base);
+ while (segment_holds(s, q) &&
+ q != m->top && q->head != FENCEPOST_HEAD) {
+ if (!is_inuse(q))
+ used -= chunksize(q);
+ q = next_chunk(q);
+ }
+ s = s->next;
+ }
+ }
+ POSTACTION(m); /* drop lock */
+ fprintf(stderr, "max system bytes = %10lu\n", (unsigned long)(maxfp));
+ fprintf(stderr, "system bytes = %10lu\n", (unsigned long)(fp));
+ fprintf(stderr, "in use bytes = %10lu\n", (unsigned long)(used));
+ }
+}
+#endif /* NO_MALLOC_STATS */
+
+/* ----------------------- Operations on smallbins ----------------------- */
+
+/*
+ Various forms of linking and unlinking are defined as macros. Even
+ the ones for trees, which are very long but have very short typical
+ paths. This is ugly but reduces reliance on inlining support of
+ compilers.
+*/
+
+/* Link a free chunk into a smallbin */
+#define insert_small_chunk(M, P, S) {\
+ bindex_t I = small_index(S);\
+ mchunkptr B = smallbin_at(M, I);\
+ mchunkptr F = B;\
+ assert(S >= MIN_CHUNK_SIZE);\
+ if (!smallmap_is_marked(M, I))\
+ mark_smallmap(M, I);\
+ else if (RTCHECK(ok_address(M, B->fd)))\
+ F = B->fd;\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ B->fd = P;\
+ F->bk = P;\
+ P->fd = F;\
+ P->bk = B;\
+}
+
+/* Unlink a chunk from a smallbin */
+#define unlink_small_chunk(M, P, S) {\
+ mchunkptr F = P->fd;\
+ mchunkptr B = P->bk;\
+ bindex_t I = small_index(S);\
+ assert(P != B);\
+ assert(P != F);\
+ assert(chunksize(P) == small_index2size(I));\
+ if (RTCHECK(F == smallbin_at(M,I) || (ok_address(M, F) && F->bk == P))) { \
+ if (B == F) {\
+ clear_smallmap(M, I);\
+ }\
+ else if (RTCHECK(B == smallbin_at(M,I) ||\
+ (ok_address(M, B) && B->fd == P))) {\
+ F->bk = B;\
+ B->fd = F;\
+ }\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ }\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+}
+
+/* Unlink the first chunk from a smallbin */
+#define unlink_first_small_chunk(M, B, P, I) {\
+ mchunkptr F = P->fd;\
+ assert(P != B);\
+ assert(P != F);\
+ assert(chunksize(P) == small_index2size(I));\
+ if (B == F) {\
+ clear_smallmap(M, I);\
+ }\
+ else if (RTCHECK(ok_address(M, F) && F->bk == P)) {\
+ F->bk = B;\
+ B->fd = F;\
+ }\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+}
+
+/* Replace dv node, binning the old one */
+/* Used only when dvsize known to be small */
+#define replace_dv(M, P, S) {\
+ size_t DVS = M->dvsize;\
+ assert(is_small(DVS));\
+ if (DVS != 0) {\
+ mchunkptr DV = M->dv;\
+ insert_small_chunk(M, DV, DVS);\
+ }\
+ M->dvsize = S;\
+ M->dv = P;\
+}
+
+/* ------------------------- Operations on trees ------------------------- */
+
+/* Insert chunk into tree */
+#define insert_large_chunk(M, X, S) {\
+ tbinptr* H;\
+ bindex_t I;\
+ compute_tree_index(S, I);\
+ H = treebin_at(M, I);\
+ X->index = I;\
+ X->child[0] = X->child[1] = 0;\
+ if (!treemap_is_marked(M, I)) {\
+ mark_treemap(M, I);\
+ *H = X;\
+ X->parent = (tchunkptr)H;\
+ X->fd = X->bk = X;\
+ }\
+ else {\
+ tchunkptr T = *H;\
+ size_t K = S << leftshift_for_tree_index(I);\
+ for (;;) {\
+ if (chunksize(T) != S) {\
+ tchunkptr* C = &(T->child[(K >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1]);\
+ K <<= 1;\
+ if (*C != 0)\
+ T = *C;\
+ else if (RTCHECK(ok_address(M, C))) {\
+ *C = X;\
+ X->parent = T;\
+ X->fd = X->bk = X;\
+ break;\
+ }\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ break;\
+ }\
+ }\
+ else {\
+ tchunkptr F = T->fd;\
+ if (RTCHECK(ok_address(M, T) && ok_address(M, F))) {\
+ T->fd = F->bk = X;\
+ X->fd = F;\
+ X->bk = T;\
+ X->parent = 0;\
+ break;\
+ }\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ break;\
+ }\
+ }\
+ }\
+ }\
+}
+
+/*
+ Unlink steps:
+
+ 1. If x is a chained node, unlink it from its same-sized fd/bk links
+ and choose its bk node as its replacement.
+ 2. If x was the last node of its size, but not a leaf node, it must
+ be replaced with a leaf node (not merely one with an open left or
+ right), to make sure that lefts and rights of descendents
+ correspond properly to bit masks. We use the rightmost descendent
+ of x. We could use any other leaf, but this is easy to locate and
+ tends to counteract removal of leftmosts elsewhere, and so keeps
+ paths shorter than minimally guaranteed. This doesn't loop much
+ because on average a node in a tree is near the bottom.
+ 3. If x is the base of a chain (i.e., has parent links) relink
+ x's parent and children to x's replacement (or null if none).
+*/
+
+#define unlink_large_chunk(M, X) {\
+ tchunkptr XP = X->parent;\
+ tchunkptr R;\
+ if (X->bk != X) {\
+ tchunkptr F = X->fd;\
+ R = X->bk;\
+ if (RTCHECK(ok_address(M, F) && F->bk == X && R->fd == X)) {\
+ F->bk = R;\
+ R->fd = F;\
+ }\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ }\
+ else {\
+ tchunkptr* RP;\
+ if (((R = *(RP = &(X->child[1]))) != 0) ||\
+ ((R = *(RP = &(X->child[0]))) != 0)) {\
+ tchunkptr* CP;\
+ while ((*(CP = &(R->child[1])) != 0) ||\
+ (*(CP = &(R->child[0])) != 0)) {\
+ R = *(RP = CP);\
+ }\
+ if (RTCHECK(ok_address(M, RP)))\
+ *RP = 0;\
+ else {\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ }\
+ }\
+ if (XP != 0) {\
+ tbinptr* H = treebin_at(M, X->index);\
+ if (X == *H) {\
+ if ((*H = R) == 0) \
+ clear_treemap(M, X->index);\
+ }\
+ else if (RTCHECK(ok_address(M, XP))) {\
+ if (XP->child[0] == X) \
+ XP->child[0] = R;\
+ else \
+ XP->child[1] = R;\
+ }\
+ else\
+ CORRUPTION_ERROR_ACTION(M);\
+ if (R != 0) {\
+ if (RTCHECK(ok_address(M, R))) {\
+ tchunkptr C0, C1;\
+ R->parent = XP;\
+ if ((C0 = X->child[0]) != 0) {\
+ if (RTCHECK(ok_address(M, C0))) {\
+ R->child[0] = C0;\
+ C0->parent = R;\
+ }\
+ else\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ if ((C1 = X->child[1]) != 0) {\
+ if (RTCHECK(ok_address(M, C1))) {\
+ R->child[1] = C1;\
+ C1->parent = R;\
+ }\
+ else\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ }\
+ else\
+ CORRUPTION_ERROR_ACTION(M);\
+ }\
+ }\
+}
+
+/* Relays to large vs small bin operations */
+
+#define insert_chunk(M, P, S)\
+ if (is_small(S)) insert_small_chunk(M, P, S)\
+ else { tchunkptr TP = (tchunkptr)(P); insert_large_chunk(M, TP, S); }
+
+#define unlink_chunk(M, P, S)\
+ if (is_small(S)) unlink_small_chunk(M, P, S)\
+ else { tchunkptr TP = (tchunkptr)(P); unlink_large_chunk(M, TP); }
+
+
+/* Relays to internal calls to malloc/free from realloc, memalign etc */
+
+#if ONLY_MSPACES
+#define internal_malloc(m, b) mspace_malloc(m, b)
+#define internal_free(m, mem) mspace_free(m,mem);
+#else /* ONLY_MSPACES */
+#if MSPACES
+#define internal_malloc(m, b)\
+ ((m == gm)? dlmalloc(b) : mspace_malloc(m, b))
+#define internal_free(m, mem)\
+ if (m == gm) dlfree(mem); else mspace_free(m,mem);
+#else /* MSPACES */
+#define internal_malloc(m, b) dlmalloc(b)
+#define internal_free(m, mem) dlfree(mem)
+#endif /* MSPACES */
+#endif /* ONLY_MSPACES */
+
+/* ----------------------- Direct-mmapping chunks ----------------------- */
+
+/*
+ Directly mmapped chunks are set up with an offset to the start of
+ the mmapped region stored in the prev_foot field of the chunk. This
+ allows reconstruction of the required argument to MUNMAP when freed,
+ and also allows adjustment of the returned chunk to meet alignment
+ requirements (especially in memalign).
+*/
+
+/* Malloc using mmap */
+static void* mmap_alloc(mstate m, size_t nb) {
+ size_t mmsize = mmap_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
+ if (m->footprint_limit != 0) {
+ size_t fp = m->footprint + mmsize;
+ if (fp <= m->footprint || fp > m->footprint_limit)
+ return 0;
+ }
+ if (mmsize > nb) { /* Check for wrap around 0 */
+ char* mm = (char*)(CALL_DIRECT_MMAP(mmsize));
+ if (mm != CMFAIL) {
+ size_t offset = align_offset(chunk2mem(mm));
+ size_t psize = mmsize - offset - MMAP_FOOT_PAD;
+ mchunkptr p = (mchunkptr)(mm + offset);
+ p->prev_foot = offset;
+ p->head = psize;
+ mark_inuse_foot(m, p, psize);
+ chunk_plus_offset(p, psize)->head = FENCEPOST_HEAD;
+ chunk_plus_offset(p, psize+SIZE_T_SIZE)->head = 0;
+
+ if (m->least_addr == 0 || mm < m->least_addr)
+ m->least_addr = mm;
+ if ((m->footprint += mmsize) > m->max_footprint)
+ m->max_footprint = m->footprint;
+ assert(is_aligned(chunk2mem(p)));
+ check_mmapped_chunk(m, p);
+ return chunk2mem(p);
+ }
+ }
+ return 0;
+}
+
+/* Realloc using mmap */
+static mchunkptr mmap_resize(mstate m, mchunkptr oldp, size_t nb, int flags) {
+ size_t oldsize = chunksize(oldp);
+ (void) flags;
+ if (is_small(nb)) /* Can't shrink mmap regions below small size */
+ return 0;
+ /* Keep old chunk if big enough but not too big */
+ if (oldsize >= nb + SIZE_T_SIZE &&
+ (oldsize - nb) <= (mparams.granularity << 1))
+ return oldp;
+ else {
+ size_t offset = oldp->prev_foot;
+ size_t oldmmsize = oldsize + offset + MMAP_FOOT_PAD;
+ size_t newmmsize = mmap_align(nb + SIX_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
+ char* cp = (char*)CALL_MREMAP((char*)oldp - offset,
+ oldmmsize, newmmsize, flags);
+ if (cp != CMFAIL) {
+ mchunkptr newp = (mchunkptr)(cp + offset);
+ size_t psize = newmmsize - offset - MMAP_FOOT_PAD;
+ newp->head = psize;
+ mark_inuse_foot(m, newp, psize);
+ chunk_plus_offset(newp, psize)->head = FENCEPOST_HEAD;
+ chunk_plus_offset(newp, psize+SIZE_T_SIZE)->head = 0;
+
+ if (cp < m->least_addr)
+ m->least_addr = cp;
+ if ((m->footprint += newmmsize - oldmmsize) > m->max_footprint)
+ m->max_footprint = m->footprint;
+ check_mmapped_chunk(m, newp);
+ return newp;
+ }
+ }
+ return 0;
+}
+
+
+/* -------------------------- mspace management -------------------------- */
+
+/* Initialize top chunk and its size */
+static void init_top(mstate m, mchunkptr p, size_t psize) {
+ /* Ensure alignment */
+ size_t offset = align_offset(chunk2mem(p));
+ p = (mchunkptr)((char*)p + offset);
+ psize -= offset;
+
+ m->top = p;
+ m->topsize = psize;
+ p->head = psize | PINUSE_BIT;
+ /* set size of fake trailing chunk holding overhead space only once */
+ chunk_plus_offset(p, psize)->head = TOP_FOOT_SIZE;
+ m->trim_check = mparams.trim_threshold; /* reset on each update */
+}
+
+/* Initialize bins for a new mstate that is otherwise zeroed out */
+static void init_bins(mstate m) {
+ /* Establish circular links for smallbins */
+ bindex_t i;
+ for (i = 0; i < NSMALLBINS; ++i) {
+ sbinptr bin = smallbin_at(m,i);
+ bin->fd = bin->bk = bin;
+ }
+}
+
+#if PROCEED_ON_ERROR
+
+/* default corruption action */
+static void reset_on_error(mstate m) {
+ int i;
+ ++malloc_corruption_error_count;
+ /* Reinitialize fields to forget about all memory */
+ m->smallmap = m->treemap = 0;
+ m->dvsize = m->topsize = 0;
+ m->seg.base = 0;
+ m->seg.size = 0;
+ m->seg.next = 0;
+ m->top = m->dv = 0;
+ for (i = 0; i < NTREEBINS; ++i)
+ *treebin_at(m, i) = 0;
+ init_bins(m);
+}
+#endif /* PROCEED_ON_ERROR */
+
+/* Allocate chunk and prepend remainder with chunk in successor base. */
+static void* prepend_alloc(mstate m, char* newbase, char* oldbase,
+ size_t nb) {
+ mchunkptr p = align_as_chunk(newbase);
+ mchunkptr oldfirst = align_as_chunk(oldbase);
+ size_t psize = (char*)oldfirst - (char*)p;
+ mchunkptr q = chunk_plus_offset(p, nb);
+ size_t qsize = psize - nb;
+ set_size_and_pinuse_of_inuse_chunk(m, p, nb);
+
+ assert((char*)oldfirst > (char*)q);
+ assert(pinuse(oldfirst));
+ assert(qsize >= MIN_CHUNK_SIZE);
+
+ /* consolidate remainder with first chunk of old base */
+ if (oldfirst == m->top) {
+ size_t tsize = m->topsize += qsize;
+ m->top = q;
+ q->head = tsize | PINUSE_BIT;
+ check_top_chunk(m, q);
+ }
+ else if (oldfirst == m->dv) {
+ size_t dsize = m->dvsize += qsize;
+ m->dv = q;
+ set_size_and_pinuse_of_free_chunk(q, dsize);
+ }
+ else {
+ if (!is_inuse(oldfirst)) {
+ size_t nsize = chunksize(oldfirst);
+ unlink_chunk(m, oldfirst, nsize);
+ oldfirst = chunk_plus_offset(oldfirst, nsize);
+ qsize += nsize;
+ }
+ set_free_with_pinuse(q, qsize, oldfirst);
+ insert_chunk(m, q, qsize);
+ check_free_chunk(m, q);
+ }
+
+ check_malloced_chunk(m, chunk2mem(p), nb);
+ return chunk2mem(p);
+}
+
+/* Add a segment to hold a new noncontiguous region */
+static void add_segment(mstate m, char* tbase, size_t tsize, flag_t mmapped) {
+ /* Determine locations and sizes of segment, fenceposts, old top */
+ char* old_top = (char*)m->top;
+ msegmentptr oldsp = segment_holding(m, old_top);
+ char* old_end = oldsp->base + oldsp->size;
+ size_t ssize = pad_request(sizeof(struct malloc_segment));
+ char* rawsp = old_end - (ssize + FOUR_SIZE_T_SIZES + CHUNK_ALIGN_MASK);
+ size_t offset = align_offset(chunk2mem(rawsp));
+ char* asp = rawsp + offset;
+ char* csp = (asp < (old_top + MIN_CHUNK_SIZE))? old_top : asp;
+ mchunkptr sp = (mchunkptr)csp;
+ msegmentptr ss = (msegmentptr)(chunk2mem(sp));
+ mchunkptr tnext = chunk_plus_offset(sp, ssize);
+ mchunkptr p = tnext;
+ int nfences = 0;
+
+ /* reset top to new space */
+ init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE);
+
+ /* Set up segment record */
+ assert(is_aligned(ss));
+ set_size_and_pinuse_of_inuse_chunk(m, sp, ssize);
+ *ss = m->seg; /* Push current record */
+ m->seg.base = tbase;
+ m->seg.size = tsize;
+ m->seg.sflags = mmapped;
+ m->seg.next = ss;
+
+ /* Insert trailing fenceposts */
+ for (;;) {
+ mchunkptr nextp = chunk_plus_offset(p, SIZE_T_SIZE);
+ p->head = FENCEPOST_HEAD;
+ ++nfences;
+ if ((char*)(&(nextp->head)) < old_end)
+ p = nextp;
+ else
+ break;
+ }
+ assert(nfences >= 2);
+
+ /* Insert the rest of old top into a bin as an ordinary free chunk */
+ if (csp != old_top) {
+ mchunkptr q = (mchunkptr)old_top;
+ size_t psize = csp - old_top;
+ mchunkptr tn = chunk_plus_offset(q, psize);
+ set_free_with_pinuse(q, psize, tn);
+ insert_chunk(m, q, psize);
+ }
+
+ check_top_chunk(m, m->top);
+}
+
+/* -------------------------- System allocation -------------------------- */
+
+/* Get memory from system using MORECORE or MMAP */
+static void* sys_alloc(mstate m, size_t nb) {
+ char* tbase = CMFAIL;
+ size_t tsize = 0;
+ flag_t mmap_flag = 0;
+ size_t asize; /* allocation size */
+
+ ensure_initialization();
+
+ /* Directly map large chunks, but only if already initialized */
+ if (use_mmap(m) && nb >= mparams.mmap_threshold && m->topsize != 0) {
+ void* mem = mmap_alloc(m, nb);
+ if (mem != 0)
+ return mem;
+ }
+
+ asize = granularity_align(nb + SYS_ALLOC_PADDING);
+ if (asize <= nb)
+ return 0; /* wraparound */
+ if (m->footprint_limit != 0) {
+ size_t fp = m->footprint + asize;
+ if (fp <= m->footprint || fp > m->footprint_limit)
+ return 0;
+ }
+
+ /*
+ Try getting memory in any of three ways (in most-preferred to
+ least-preferred order):
+ 1. A call to MORECORE that can normally contiguously extend memory.
+ (disabled if not MORECORE_CONTIGUOUS or not HAVE_MORECORE or
+ or main space is mmapped or a previous contiguous call failed)
+ 2. A call to MMAP new space (disabled if not HAVE_MMAP).
+ Note that under the default settings, if MORECORE is unable to
+ fulfill a request, and HAVE_MMAP is true, then mmap is
+ used as a noncontiguous system allocator. This is a useful backup
+ strategy for systems with holes in address spaces -- in this case
+ sbrk cannot contiguously expand the heap, but mmap may be able to
+ find space.
+ 3. A call to MORECORE that cannot usually contiguously extend memory.
+ (disabled if not HAVE_MORECORE)
+
+ In all cases, we need to request enough bytes from system to ensure
+ we can malloc nb bytes upon success, so pad with enough space for
+ top_foot, plus alignment-pad to make sure we don't lose bytes if
+ not on boundary, and round this up to a granularity unit.
+ */
+
+ if (MORECORE_CONTIGUOUS && !use_noncontiguous(m)) {
+ char* br = CMFAIL;
+ msegmentptr ss = (m->top == 0)? 0 : segment_holding(m, (char*)m->top);
+ ACQUIRE_MALLOC_GLOBAL_LOCK();
+
+ if (ss == 0) { /* First time through or recovery */
+ char* base = (char*)CALL_MORECORE(0);
+ if (base != CMFAIL) {
+ size_t fp;
+ /* Adjust to end on a page boundary */
+ if (!is_page_aligned(base))
+ asize += (page_align((size_t)base) - (size_t)base);
+ fp = m->footprint + asize; /* recheck limits */
+ if (asize > nb && asize < HALF_MAX_SIZE_T &&
+ (m->footprint_limit == 0 ||
+ (fp > m->footprint && fp <= m->footprint_limit)) &&
+ (br = (char*)(CALL_MORECORE(asize))) == base) {
+ tbase = base;
+ tsize = asize;
+ }
+ }
+ }
+ else {
+ /* Subtract out existing available top space from MORECORE request. */
+ asize = granularity_align(nb - m->topsize + SYS_ALLOC_PADDING);
+ /* Use mem here only if it did continuously extend old space */
+ if (asize < HALF_MAX_SIZE_T &&
+ (br = (char*)(CALL_MORECORE(asize))) == ss->base+ss->size) {
+ tbase = br;
+ tsize = asize;
+ }
+ }
+
+ if (tbase == CMFAIL) { /* Cope with partial failure */
+ if (br != CMFAIL) { /* Try to use/extend the space we did get */
+ if (asize < HALF_MAX_SIZE_T &&
+ asize < nb + SYS_ALLOC_PADDING) {
+ size_t esize = granularity_align(nb + SYS_ALLOC_PADDING - asize);
+ if (esize < HALF_MAX_SIZE_T) {
+ char* end = (char*)CALL_MORECORE(esize);
+ if (end != CMFAIL)
+ asize += esize;
+ else { /* Can't use; try to release */
+ (void) CALL_MORECORE(-asize);
+ br = CMFAIL;
+ }
+ }
+ }
+ }
+ if (br != CMFAIL) { /* Use the space we did get */
+ tbase = br;
+ tsize = asize;
+ }
+ else
+ disable_contiguous(m); /* Don't try contiguous path in the future */
+ }
+
+ RELEASE_MALLOC_GLOBAL_LOCK();
+ }
+
+ if (HAVE_MMAP && tbase == CMFAIL) { /* Try MMAP */
+ char* mp = (char*)(CALL_MMAP(asize));
+ if (mp != CMFAIL) {
+ tbase = mp;
+ tsize = asize;
+ mmap_flag = USE_MMAP_BIT;
+ }
+ }
+
+ if (HAVE_MORECORE && tbase == CMFAIL) { /* Try noncontiguous MORECORE */
+ if (asize < HALF_MAX_SIZE_T) {
+ char* br = CMFAIL;
+ char* end = CMFAIL;
+ ACQUIRE_MALLOC_GLOBAL_LOCK();
+ br = (char*)(CALL_MORECORE(asize));
+ end = (char*)(CALL_MORECORE(0));
+ RELEASE_MALLOC_GLOBAL_LOCK();
+ if (br != CMFAIL && end != CMFAIL && br < end) {
+ size_t ssize = end - br;
+ if (ssize > nb + TOP_FOOT_SIZE) {
+ tbase = br;
+ tsize = ssize;
+ }
+ }
+ }
+ }
+
+ if (tbase != CMFAIL) {
+
+ if ((m->footprint += tsize) > m->max_footprint)
+ m->max_footprint = m->footprint;
+
+ if (!is_initialized(m)) { /* first-time initialization */
+ if (m->least_addr == 0 || tbase < m->least_addr)
+ m->least_addr = tbase;
+ m->seg.base = tbase;
+ m->seg.size = tsize;
+ m->seg.sflags = mmap_flag;
+ m->magic = mparams.magic;
+ m->release_checks = MAX_RELEASE_CHECK_RATE;
+ init_bins(m);
+#if !ONLY_MSPACES
+ if (is_global(m))
+ init_top(m, (mchunkptr)tbase, tsize - TOP_FOOT_SIZE);
+ else
+#endif
+ {
+ /* Offset top by embedded malloc_state */
+ mchunkptr mn = next_chunk(mem2chunk(m));
+ init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) -TOP_FOOT_SIZE);
+ }
+ }
+
+ else {
+ /* Try to merge with an existing segment */
+ msegmentptr sp = &m->seg;
+ /* Only consider most recent segment if traversal suppressed */
+ while (sp != 0 && tbase != sp->base + sp->size)
+ sp = (NO_SEGMENT_TRAVERSAL) ? 0 : sp->next;
+ if (sp != 0 &&
+ !is_extern_segment(sp) &&
+ (sp->sflags & USE_MMAP_BIT) == mmap_flag &&
+ segment_holds(sp, m->top)) { /* append */
+ sp->size += tsize;
+ init_top(m, m->top, m->topsize + tsize);
+ }
+ else {
+ if (tbase < m->least_addr)
+ m->least_addr = tbase;
+ sp = &m->seg;
+ while (sp != 0 && sp->base != tbase + tsize)
+ sp = (NO_SEGMENT_TRAVERSAL) ? 0 : sp->next;
+ if (sp != 0 &&
+ !is_extern_segment(sp) &&
+ (sp->sflags & USE_MMAP_BIT) == mmap_flag) {
+ char* oldbase = sp->base;
+ sp->base = tbase;
+ sp->size += tsize;
+ return prepend_alloc(m, tbase, oldbase, nb);
+ }
+ else
+ add_segment(m, tbase, tsize, mmap_flag);
+ }
+ }
+
+ if (nb < m->topsize) { /* Allocate from new or extended top space */
+ size_t rsize = m->topsize -= nb;
+ mchunkptr p = m->top;
+ mchunkptr r = m->top = chunk_plus_offset(p, nb);
+ r->head = rsize | PINUSE_BIT;
+ set_size_and_pinuse_of_inuse_chunk(m, p, nb);
+ check_top_chunk(m, m->top);
+ check_malloced_chunk(m, chunk2mem(p), nb);
+ return chunk2mem(p);
+ }
+ }
+
+ MALLOC_FAILURE_ACTION;
+ return 0;
+}
+
+/* ----------------------- system deallocation -------------------------- */
+
+/* Unmap and unlink any mmapped segments that don't contain used chunks */
+static size_t release_unused_segments(mstate m) {
+ size_t released = 0;
+ int nsegs = 0;
+ msegmentptr pred = &m->seg;
+ msegmentptr sp = pred->next;
+ while (sp != 0) {
+ char* base = sp->base;
+ size_t size = sp->size;
+ msegmentptr next = sp->next;
+ ++nsegs;
+ if (is_mmapped_segment(sp) && !is_extern_segment(sp)) {
+ mchunkptr p = align_as_chunk(base);
+ size_t psize = chunksize(p);
+ /* Can unmap if first chunk holds entire segment and not pinned */
+ if (!is_inuse(p) && (char*)p + psize >= base + size - TOP_FOOT_SIZE) {
+ tchunkptr tp = (tchunkptr)p;
+ assert(segment_holds(sp, (char*)sp));
+ if (p == m->dv) {
+ m->dv = 0;
+ m->dvsize = 0;
+ }
+ else {
+ unlink_large_chunk(m, tp);
+ }
+ if (CALL_MUNMAP(base, size) == 0) {
+ released += size;
+ m->footprint -= size;
+ /* unlink obsoleted record */
+ sp = pred;
+ sp->next = next;
+ }
+ else { /* back out if cannot unmap */
+ insert_large_chunk(m, tp, psize);
+ }
+ }
+ }
+ if (NO_SEGMENT_TRAVERSAL) /* scan only first segment */
+ break;
+ pred = sp;
+ sp = next;
+ }
+ /* Reset check counter */
+ m->release_checks = ((nsegs > MAX_RELEASE_CHECK_RATE)?
+ nsegs : MAX_RELEASE_CHECK_RATE);
+ return released;
+}
+
+static int sys_trim(mstate m, size_t pad) {
+ size_t released = 0;
+ ensure_initialization();
+ if (pad < MAX_REQUEST && is_initialized(m)) {
+ pad += TOP_FOOT_SIZE; /* ensure enough room for segment overhead */
+
+ if (m->topsize > pad) {
+ /* Shrink top space in granularity-size units, keeping at least one */
+ size_t unit = mparams.granularity;
+ size_t extra = ((m->topsize - pad + (unit - SIZE_T_ONE)) / unit -
+ SIZE_T_ONE) * unit;
+ msegmentptr sp = segment_holding(m, (char*)m->top);
+
+ if (!is_extern_segment(sp)) {
+ if (is_mmapped_segment(sp)) {
+ if (HAVE_MMAP &&
+ sp->size >= extra &&
+ !has_segment_link(m, sp)) { /* can't shrink if pinned */
+ size_t newsize = sp->size - extra;
+ /* Prefer mremap, fall back to munmap */
+ if ((CALL_MREMAP(sp->base, sp->size, newsize, 0) != MFAIL) ||
+ (CALL_MUNMAP(sp->base + newsize, extra) == 0)) {
+ released = extra;
+ }
+ }
+ }
+ else if (HAVE_MORECORE) {
+ if (extra >= HALF_MAX_SIZE_T) /* Avoid wrapping negative */
+ extra = (HALF_MAX_SIZE_T) + SIZE_T_ONE - unit;
+ ACQUIRE_MALLOC_GLOBAL_LOCK();
+ {
+ /* Make sure end of memory is where we last set it. */
+ char* old_br = (char*)(CALL_MORECORE(0));
+ if (old_br == sp->base + sp->size) {
+ char* rel_br = (char*)(CALL_MORECORE(-extra));
+ char* new_br = (char*)(CALL_MORECORE(0));
+ if (rel_br != CMFAIL && new_br < old_br)
+ released = old_br - new_br;
+ }
+ }
+ RELEASE_MALLOC_GLOBAL_LOCK();
+ }
+ }
+
+ if (released != 0) {
+ sp->size -= released;
+ m->footprint -= released;
+ init_top(m, m->top, m->topsize - released);
+ check_top_chunk(m, m->top);
+ }
+ }
+
+ /* Unmap any unused mmapped segments */
+ if (HAVE_MMAP)
+ released += release_unused_segments(m);
+
+ /* On failure, disable autotrim to avoid repeated failed future calls */
+ if (released == 0 && m->topsize > m->trim_check)
+ m->trim_check = MAX_SIZE_T;
+ }
+
+ return (released != 0)? 1 : 0;
+}
+
+/* Consolidate and bin a chunk. Differs from exported versions
+ of free mainly in that the chunk need not be marked as inuse.
+*/
+static void dispose_chunk(mstate m, mchunkptr p, size_t psize) {
+ mchunkptr next = chunk_plus_offset(p, psize);
+ if (!pinuse(p)) {
+ mchunkptr prev;
+ size_t prevsize = p->prev_foot;
+ if (is_mmapped(p)) {
+ psize += prevsize + MMAP_FOOT_PAD;
+ if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
+ m->footprint -= psize;
+ return;
+ }
+ prev = chunk_minus_offset(p, prevsize);
+ psize += prevsize;
+ p = prev;
+ if (RTCHECK(ok_address(m, prev))) { /* consolidate backward */
+ if (p != m->dv) {
+ unlink_chunk(m, p, prevsize);
+ }
+ else if ((next->head & INUSE_BITS) == INUSE_BITS) {
+ m->dvsize = psize;
+ set_free_with_pinuse(p, psize, next);
+ return;
+ }
+ }
+ else {
+ CORRUPTION_ERROR_ACTION(m);
+ return;
+ }
+ }
+ if (RTCHECK(ok_address(m, next))) {
+ if (!cinuse(next)) { /* consolidate forward */
+ if (next == m->top) {
+ size_t tsize = m->topsize += psize;
+ m->top = p;
+ p->head = tsize | PINUSE_BIT;
+ if (p == m->dv) {
+ m->dv = 0;
+ m->dvsize = 0;
+ }
+ return;
+ }
+ else if (next == m->dv) {
+ size_t dsize = m->dvsize += psize;
+ m->dv = p;
+ set_size_and_pinuse_of_free_chunk(p, dsize);
+ return;
+ }
+ else {
+ size_t nsize = chunksize(next);
+ psize += nsize;
+ unlink_chunk(m, next, nsize);
+ set_size_and_pinuse_of_free_chunk(p, psize);
+ if (p == m->dv) {
+ m->dvsize = psize;
+ return;
+ }
+ }
+ }
+ else {
+ set_free_with_pinuse(p, psize, next);
+ }
+ insert_chunk(m, p, psize);
+ }
+ else {
+ CORRUPTION_ERROR_ACTION(m);
+ }
+}
+
+/* ---------------------------- malloc --------------------------- */
+
+/* allocate a large request from the best fitting chunk in a treebin */
+static void* tmalloc_large(mstate m, size_t nb) {
+ tchunkptr v = 0;
+ size_t rsize = -nb; /* Unsigned negation */
+ tchunkptr t;
+ bindex_t idx;
+ compute_tree_index(nb, idx);
+ if ((t = *treebin_at(m, idx)) != 0) {
+ /* Traverse tree for this bin looking for node with size == nb */
+ size_t sizebits = nb << leftshift_for_tree_index(idx);
+ tchunkptr rst = 0; /* The deepest untaken right subtree */
+ for (;;) {
+ tchunkptr rt;
+ size_t trem = chunksize(t) - nb;
+ if (trem < rsize) {
+ v = t;
+ if ((rsize = trem) == 0)
+ break;
+ }
+ rt = t->child[1];
+ t = t->child[(sizebits >> (SIZE_T_BITSIZE-SIZE_T_ONE)) & 1];
+ if (rt != 0 && rt != t)
+ rst = rt;
+ if (t == 0) {
+ t = rst; /* set t to least subtree holding sizes > nb */
+ break;
+ }
+ sizebits <<= 1;
+ }
+ }
+ if (t == 0 && v == 0) { /* set t to root of next non-empty treebin */
+ binmap_t leftbits = left_bits(idx2bit(idx)) & m->treemap;
+ if (leftbits != 0) {
+ bindex_t i;
+ binmap_t leastbit = least_bit(leftbits);
+ compute_bit2idx(leastbit, i);
+ t = *treebin_at(m, i);
+ }
+ }
+
+ while (t != 0) { /* find smallest of tree or subtree */
+ size_t trem = chunksize(t) - nb;
+ if (trem < rsize) {
+ rsize = trem;
+ v = t;
+ }
+ t = leftmost_child(t);
+ }
+
+ /* If dv is a better fit, return 0 so malloc will use it */
+ if (v != 0 && rsize < (size_t)(m->dvsize - nb)) {
+ if (RTCHECK(ok_address(m, v))) { /* split */
+ mchunkptr r = chunk_plus_offset(v, nb);
+ assert(chunksize(v) == rsize + nb);
+ if (RTCHECK(ok_next(v, r))) {
+ unlink_large_chunk(m, v);
+ if (rsize < MIN_CHUNK_SIZE)
+ set_inuse_and_pinuse(m, v, (rsize + nb));
+ else {
+ set_size_and_pinuse_of_inuse_chunk(m, v, nb);
+ set_size_and_pinuse_of_free_chunk(r, rsize);
+ insert_chunk(m, r, rsize);
+ }
+ return chunk2mem(v);
+ }
+ }
+ CORRUPTION_ERROR_ACTION(m);
+ }
+ return 0;
+}
+
+/* allocate a small request from the best fitting chunk in a treebin */
+static void* tmalloc_small(mstate m, size_t nb) {
+ tchunkptr t, v;
+ size_t rsize;
+ bindex_t i;
+ binmap_t leastbit = least_bit(m->treemap);
+ compute_bit2idx(leastbit, i);
+ v = t = *treebin_at(m, i);
+ rsize = chunksize(t) - nb;
+
+ while ((t = leftmost_child(t)) != 0) {
+ size_t trem = chunksize(t) - nb;
+ if (trem < rsize) {
+ rsize = trem;
+ v = t;
+ }
+ }
+
+ if (RTCHECK(ok_address(m, v))) {
+ mchunkptr r = chunk_plus_offset(v, nb);
+ assert(chunksize(v) == rsize + nb);
+ if (RTCHECK(ok_next(v, r))) {
+ unlink_large_chunk(m, v);
+ if (rsize < MIN_CHUNK_SIZE)
+ set_inuse_and_pinuse(m, v, (rsize + nb));
+ else {
+ set_size_and_pinuse_of_inuse_chunk(m, v, nb);
+ set_size_and_pinuse_of_free_chunk(r, rsize);
+ replace_dv(m, r, rsize);
+ }
+ return chunk2mem(v);
+ }
+ }
+
+ CORRUPTION_ERROR_ACTION(m);
+ return 0;
+}
+
+#if !ONLY_MSPACES
+
+void* dlmalloc(size_t bytes) {
+ /*
+ Basic algorithm:
+ If a small request (< 256 bytes minus per-chunk overhead):
+ 1. If one exists, use a remainderless chunk in associated smallbin.
+ (Remainderless means that there are too few excess bytes to
+ represent as a chunk.)
+ 2. If it is big enough, use the dv chunk, which is normally the
+ chunk adjacent to the one used for the most recent small request.
+ 3. If one exists, split the smallest available chunk in a bin,
+ saving remainder in dv.
+ 4. If it is big enough, use the top chunk.
+ 5. If available, get memory from system and use it
+ Otherwise, for a large request:
+ 1. Find the smallest available binned chunk that fits, and use it
+ if it is better fitting than dv chunk, splitting if necessary.
+ 2. If better fitting than any binned chunk, use the dv chunk.
+ 3. If it is big enough, use the top chunk.
+ 4. If request size >= mmap threshold, try to directly mmap this chunk.
+ 5. If available, get memory from system and use it
+
+ The ugly goto's here ensure that postaction occurs along all paths.
+ */
+
+#if USE_LOCKS
+ ensure_initialization(); /* initialize in sys_alloc if not using locks */
+#endif
+
+ if (!PREACTION(gm)) {
+ void* mem;
+ size_t nb;
+ if (bytes <= MAX_SMALL_REQUEST) {
+ bindex_t idx;
+ binmap_t smallbits;
+ nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);
+ idx = small_index(nb);
+ smallbits = gm->smallmap >> idx;
+
+ if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */
+ mchunkptr b, p;
+ idx += ~smallbits & 1; /* Uses next bin if idx empty */
+ b = smallbin_at(gm, idx);
+ p = b->fd;
+ assert(chunksize(p) == small_index2size(idx));
+ unlink_first_small_chunk(gm, b, p, idx);
+ set_inuse_and_pinuse(gm, p, small_index2size(idx));
+ mem = chunk2mem(p);
+ check_malloced_chunk(gm, mem, nb);
+ goto postaction;
+ }
+
+ else if (nb > gm->dvsize) {
+ if (smallbits != 0) { /* Use chunk in next nonempty smallbin */
+ mchunkptr b, p, r;
+ size_t rsize;
+ bindex_t i;
+ binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));
+ binmap_t leastbit = least_bit(leftbits);
+ compute_bit2idx(leastbit, i);
+ b = smallbin_at(gm, i);
+ p = b->fd;
+ assert(chunksize(p) == small_index2size(i));
+ unlink_first_small_chunk(gm, b, p, i);
+ rsize = small_index2size(i) - nb;
+ /* Fit here cannot be remainderless if 4byte sizes */
+ if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)
+ set_inuse_and_pinuse(gm, p, small_index2size(i));
+ else {
+ set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
+ r = chunk_plus_offset(p, nb);
+ set_size_and_pinuse_of_free_chunk(r, rsize);
+ replace_dv(gm, r, rsize);
+ }
+ mem = chunk2mem(p);
+ check_malloced_chunk(gm, mem, nb);
+ goto postaction;
+ }
+
+ else if (gm->treemap != 0 && (mem = tmalloc_small(gm, nb)) != 0) {
+ check_malloced_chunk(gm, mem, nb);
+ goto postaction;
+ }
+ }
+ }
+ else if (bytes >= MAX_REQUEST)
+ nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */
+ else {
+ nb = pad_request(bytes);
+ if (gm->treemap != 0 && (mem = tmalloc_large(gm, nb)) != 0) {
+ check_malloced_chunk(gm, mem, nb);
+ goto postaction;
+ }
+ }
+
+ if (nb <= gm->dvsize) {
+ size_t rsize = gm->dvsize - nb;
+ mchunkptr p = gm->dv;
+ if (rsize >= MIN_CHUNK_SIZE) { /* split dv */
+ mchunkptr r = gm->dv = chunk_plus_offset(p, nb);
+ gm->dvsize = rsize;
+ set_size_and_pinuse_of_free_chunk(r, rsize);
+ set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
+ }
+ else { /* exhaust dv */
+ size_t dvs = gm->dvsize;
+ gm->dvsize = 0;
+ gm->dv = 0;
+ set_inuse_and_pinuse(gm, p, dvs);
+ }
+ mem = chunk2mem(p);
+ check_malloced_chunk(gm, mem, nb);
+ goto postaction;
+ }
+
+ else if (nb < gm->topsize) { /* Split top */
+ size_t rsize = gm->topsize -= nb;
+ mchunkptr p = gm->top;
+ mchunkptr r = gm->top = chunk_plus_offset(p, nb);
+ r->head = rsize | PINUSE_BIT;
+ set_size_and_pinuse_of_inuse_chunk(gm, p, nb);
+ mem = chunk2mem(p);
+ check_top_chunk(gm, gm->top);
+ check_malloced_chunk(gm, mem, nb);
+ goto postaction;
+ }
+
+ mem = sys_alloc(gm, nb);
+
+ postaction:
+ POSTACTION(gm);
+ return mem;
+ }
+
+ return 0;
+}
+
+/* ---------------------------- free --------------------------- */
+
+void dlfree(void* mem) {
+ /*
+ Consolidate freed chunks with preceeding or succeeding bordering
+ free chunks, if they exist, and then place in a bin. Intermixed
+ with special cases for top, dv, mmapped chunks, and usage errors.
+ */
+
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+#if FOOTERS
+ mstate fm = get_mstate_for(p);
+ if (!ok_magic(fm)) {
+ USAGE_ERROR_ACTION(fm, p);
+ return;
+ }
+#else /* FOOTERS */
+#define fm gm
+#endif /* FOOTERS */
+ if (!PREACTION(fm)) {
+ check_inuse_chunk(fm, p);
+ if (RTCHECK(ok_address(fm, p) && ok_inuse(p))) {
+ size_t psize = chunksize(p);
+ mchunkptr next = chunk_plus_offset(p, psize);
+ if (!pinuse(p)) {
+ size_t prevsize = p->prev_foot;
+ if (is_mmapped(p)) {
+ psize += prevsize + MMAP_FOOT_PAD;
+ if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
+ fm->footprint -= psize;
+ goto postaction;
+ }
+ else {
+ mchunkptr prev = chunk_minus_offset(p, prevsize);
+ psize += prevsize;
+ p = prev;
+ if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */
+ if (p != fm->dv) {
+ unlink_chunk(fm, p, prevsize);
+ }
+ else if ((next->head & INUSE_BITS) == INUSE_BITS) {
+ fm->dvsize = psize;
+ set_free_with_pinuse(p, psize, next);
+ goto postaction;
+ }
+ }
+ else
+ goto erroraction;
+ }
+ }
+
+ if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {
+ if (!cinuse(next)) { /* consolidate forward */
+ if (next == fm->top) {
+ size_t tsize = fm->topsize += psize;
+ fm->top = p;
+ p->head = tsize | PINUSE_BIT;
+ if (p == fm->dv) {
+ fm->dv = 0;
+ fm->dvsize = 0;
+ }
+ if (should_trim(fm, tsize))
+ sys_trim(fm, 0);
+ goto postaction;
+ }
+ else if (next == fm->dv) {
+ size_t dsize = fm->dvsize += psize;
+ fm->dv = p;
+ set_size_and_pinuse_of_free_chunk(p, dsize);
+ goto postaction;
+ }
+ else {
+ size_t nsize = chunksize(next);
+ psize += nsize;
+ unlink_chunk(fm, next, nsize);
+ set_size_and_pinuse_of_free_chunk(p, psize);
+ if (p == fm->dv) {
+ fm->dvsize = psize;
+ goto postaction;
+ }
+ }
+ }
+ else
+ set_free_with_pinuse(p, psize, next);
+
+ if (is_small(psize)) {
+ insert_small_chunk(fm, p, psize);
+ check_free_chunk(fm, p);
+ }
+ else {
+ tchunkptr tp = (tchunkptr)p;
+ insert_large_chunk(fm, tp, psize);
+ check_free_chunk(fm, p);
+ if (--fm->release_checks == 0)
+ release_unused_segments(fm);
+ }
+ goto postaction;
+ }
+ }
+ erroraction:
+ USAGE_ERROR_ACTION(fm, p);
+ postaction:
+ POSTACTION(fm);
+ }
+ }
+#if !FOOTERS
+#undef fm
+#endif /* FOOTERS */
+}
+
+void* dlcalloc(size_t n_elements, size_t elem_size) {
+ void* mem;
+ size_t req = 0;
+ if (n_elements != 0) {
+ req = n_elements * elem_size;
+ if (((n_elements | elem_size) & ~(size_t)0xffff) &&
+ (req / n_elements != elem_size))
+ req = MAX_SIZE_T; /* force downstream failure on overflow */
+ }
+ mem = dlmalloc(req);
+ if (mem != 0 && calloc_must_clear(mem2chunk(mem)))
+ memset(mem, 0, req);
+ return mem;
+}
+
+#endif /* !ONLY_MSPACES */
+
+/* ------------ Internal support for realloc, memalign, etc -------------- */
+
+/* Try to realloc; only in-place unless can_move true */
+static mchunkptr try_realloc_chunk(mstate m, mchunkptr p, size_t nb,
+ int can_move) {
+ mchunkptr newp = 0;
+ size_t oldsize = chunksize(p);
+ mchunkptr next = chunk_plus_offset(p, oldsize);
+ if (RTCHECK(ok_address(m, p) && ok_inuse(p) &&
+ ok_next(p, next) && ok_pinuse(next))) {
+ if (is_mmapped(p)) {
+ newp = mmap_resize(m, p, nb, can_move);
+ }
+ else if (oldsize >= nb) { /* already big enough */
+ size_t rsize = oldsize - nb;
+ if (rsize >= MIN_CHUNK_SIZE) { /* split off remainder */
+ mchunkptr r = chunk_plus_offset(p, nb);
+ set_inuse(m, p, nb);
+ set_inuse(m, r, rsize);
+ dispose_chunk(m, r, rsize);
+ }
+ newp = p;
+ }
+ else if (next == m->top) { /* extend into top */
+ if (oldsize + m->topsize > nb) {
+ size_t newsize = oldsize + m->topsize;
+ size_t newtopsize = newsize - nb;
+ mchunkptr newtop = chunk_plus_offset(p, nb);
+ set_inuse(m, p, nb);
+ newtop->head = newtopsize |PINUSE_BIT;
+ m->top = newtop;
+ m->topsize = newtopsize;
+ newp = p;
+ }
+ }
+ else if (next == m->dv) { /* extend into dv */
+ size_t dvs = m->dvsize;
+ if (oldsize + dvs >= nb) {
+ size_t dsize = oldsize + dvs - nb;
+ if (dsize >= MIN_CHUNK_SIZE) {
+ mchunkptr r = chunk_plus_offset(p, nb);
+ mchunkptr n = chunk_plus_offset(r, dsize);
+ set_inuse(m, p, nb);
+ set_size_and_pinuse_of_free_chunk(r, dsize);
+ clear_pinuse(n);
+ m->dvsize = dsize;
+ m->dv = r;
+ }
+ else { /* exhaust dv */
+ size_t newsize = oldsize + dvs;
+ set_inuse(m, p, newsize);
+ m->dvsize = 0;
+ m->dv = 0;
+ }
+ newp = p;
+ }
+ }
+ else if (!cinuse(next)) { /* extend into next free chunk */
+ size_t nextsize = chunksize(next);
+ if (oldsize + nextsize >= nb) {
+ size_t rsize = oldsize + nextsize - nb;
+ unlink_chunk(m, next, nextsize);
+ if (rsize < MIN_CHUNK_SIZE) {
+ size_t newsize = oldsize + nextsize;
+ set_inuse(m, p, newsize);
+ }
+ else {
+ mchunkptr r = chunk_plus_offset(p, nb);
+ set_inuse(m, p, nb);
+ set_inuse(m, r, rsize);
+ dispose_chunk(m, r, rsize);
+ }
+ newp = p;
+ }
+ }
+ }
+ else {
+ USAGE_ERROR_ACTION(m, oldmem);
+ }
+ return newp;
+}
+
+static void* internal_memalign(mstate m, size_t alignment, size_t bytes) {
+ void* mem = 0;
+ if (alignment < MIN_CHUNK_SIZE) /* must be at least a minimum chunk size */
+ alignment = MIN_CHUNK_SIZE;
+ if ((alignment & (alignment-SIZE_T_ONE)) != 0) {/* Ensure a power of 2 */
+ size_t a = MALLOC_ALIGNMENT << 1;
+ while (a < alignment) a <<= 1;
+ alignment = a;
+ }
+ if (bytes >= MAX_REQUEST - alignment) {
+ if (m != 0) { /* Test isn't needed but avoids compiler warning */
+ MALLOC_FAILURE_ACTION;
+ }
+ }
+ else {
+ size_t nb = request2size(bytes);
+ size_t req = nb + alignment + MIN_CHUNK_SIZE - CHUNK_OVERHEAD;
+ mem = internal_malloc(m, req);
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+ if (PREACTION(m))
+ return 0;
+ if ((((size_t)(mem)) & (alignment - 1)) != 0) { /* misaligned */
+ /*
+ Find an aligned spot inside chunk. Since we need to give
+ back leading space in a chunk of at least MIN_CHUNK_SIZE, if
+ the first calculation places us at a spot with less than
+ MIN_CHUNK_SIZE leader, we can move to the next aligned spot.
+ We've allocated enough total room so that this is always
+ possible.
+ */
+ char* br = (char*)mem2chunk((size_t)(((size_t)((char*)mem + alignment -
+ SIZE_T_ONE)) &
+ -alignment));
+ char* pos = ((size_t)(br - (char*)(p)) >= MIN_CHUNK_SIZE)?
+ br : br+alignment;
+ mchunkptr newp = (mchunkptr)pos;
+ size_t leadsize = pos - (char*)(p);
+ size_t newsize = chunksize(p) - leadsize;
+
+ if (is_mmapped(p)) { /* For mmapped chunks, just adjust offset */
+ newp->prev_foot = p->prev_foot + leadsize;
+ newp->head = newsize;
+ }
+ else { /* Otherwise, give back leader, use the rest */
+ set_inuse(m, newp, newsize);
+ set_inuse(m, p, leadsize);
+ dispose_chunk(m, p, leadsize);
+ }
+ p = newp;
+ }
+
+ /* Give back spare room at the end */
+ if (!is_mmapped(p)) {
+ size_t size = chunksize(p);
+ if (size > nb + MIN_CHUNK_SIZE) {
+ size_t remainder_size = size - nb;
+ mchunkptr remainder = chunk_plus_offset(p, nb);
+ set_inuse(m, p, nb);
+ set_inuse(m, remainder, remainder_size);
+ dispose_chunk(m, remainder, remainder_size);
+ }
+ }
+
+ mem = chunk2mem(p);
+ assert (chunksize(p) >= nb);
+ assert(((size_t)mem & (alignment - 1)) == 0);
+ check_inuse_chunk(m, p);
+ POSTACTION(m);
+ }
+ }
+ return mem;
+}
+
+/*
+ Common support for independent_X routines, handling
+ all of the combinations that can result.
+ The opts arg has:
+ bit 0 set if all elements are same size (using sizes[0])
+ bit 1 set if elements should be zeroed
+*/
+static void** ialloc(mstate m,
+ size_t n_elements,
+ size_t* sizes,
+ int opts,
+ void* chunks[]) {
+
+ size_t element_size; /* chunksize of each element, if all same */
+ size_t contents_size; /* total size of elements */
+ size_t array_size; /* request size of pointer array */
+ void* mem; /* malloced aggregate space */
+ mchunkptr p; /* corresponding chunk */
+ size_t remainder_size; /* remaining bytes while splitting */
+ void** marray; /* either "chunks" or malloced ptr array */
+ mchunkptr array_chunk; /* chunk for malloced ptr array */
+ flag_t was_enabled; /* to disable mmap */
+ size_t size;
+ size_t i;
+
+ ensure_initialization();
+ /* compute array length, if needed */
+ if (chunks != 0) {
+ if (n_elements == 0)
+ return chunks; /* nothing to do */
+ marray = chunks;
+ array_size = 0;
+ }
+ else {
+ /* if empty req, must still return chunk representing empty array */
+ if (n_elements == 0)
+ return (void**)internal_malloc(m, 0);
+ marray = 0;
+ array_size = request2size(n_elements * (sizeof(void*)));
+ }
+
+ /* compute total element size */
+ if (opts & 0x1) { /* all-same-size */
+ element_size = request2size(*sizes);
+ contents_size = n_elements * element_size;
+ }
+ else { /* add up all the sizes */
+ element_size = 0;
+ contents_size = 0;
+ for (i = 0; i != n_elements; ++i)
+ contents_size += request2size(sizes[i]);
+ }
+
+ size = contents_size + array_size;
+
+ /*
+ Allocate the aggregate chunk. First disable direct-mmapping so
+ malloc won't use it, since we would not be able to later
+ free/realloc space internal to a segregated mmap region.
+ */
+ was_enabled = use_mmap(m);
+ disable_mmap(m);
+ mem = internal_malloc(m, size - CHUNK_OVERHEAD);
+ if (was_enabled)
+ enable_mmap(m);
+ if (mem == 0)
+ return 0;
+
+ if (PREACTION(m)) return 0;
+ p = mem2chunk(mem);
+ remainder_size = chunksize(p);
+
+ assert(!is_mmapped(p));
+
+ if (opts & 0x2) { /* optionally clear the elements */
+ memset((size_t*)mem, 0, remainder_size - SIZE_T_SIZE - array_size);
+ }
+
+ /* If not provided, allocate the pointer array as final part of chunk */
+ if (marray == 0) {
+ size_t array_chunk_size;
+ array_chunk = chunk_plus_offset(p, contents_size);
+ array_chunk_size = remainder_size - contents_size;
+ marray = (void**) (chunk2mem(array_chunk));
+ set_size_and_pinuse_of_inuse_chunk(m, array_chunk, array_chunk_size);
+ remainder_size = contents_size;
+ }
+
+ /* split out elements */
+ for (i = 0; ; ++i) {
+ marray[i] = chunk2mem(p);
+ if (i != n_elements-1) {
+ if (element_size != 0)
+ size = element_size;
+ else
+ size = request2size(sizes[i]);
+ remainder_size -= size;
+ set_size_and_pinuse_of_inuse_chunk(m, p, size);
+ p = chunk_plus_offset(p, size);
+ }
+ else { /* the final element absorbs any overallocation slop */
+ set_size_and_pinuse_of_inuse_chunk(m, p, remainder_size);
+ break;
+ }
+ }
+
+#if DEBUG
+ if (marray != chunks) {
+ /* final element must have exactly exhausted chunk */
+ if (element_size != 0) {
+ assert(remainder_size == element_size);
+ }
+ else {
+ assert(remainder_size == request2size(sizes[i]));
+ }
+ check_inuse_chunk(m, mem2chunk(marray));
+ }
+ for (i = 0; i != n_elements; ++i)
+ check_inuse_chunk(m, mem2chunk(marray[i]));
+
+#endif /* DEBUG */
+
+ POSTACTION(m);
+ return marray;
+}
+
+/* Try to free all pointers in the given array.
+ Note: this could be made faster, by delaying consolidation,
+ at the price of disabling some user integrity checks, We
+ still optimize some consolidations by combining adjacent
+ chunks before freeing, which will occur often if allocated
+ with ialloc or the array is sorted.
+*/
+static size_t internal_bulk_free(mstate m, void* array[], size_t nelem) {
+ size_t unfreed = 0;
+ if (!PREACTION(m)) {
+ void** a;
+ void** fence = &(array[nelem]);
+ for (a = array; a != fence; ++a) {
+ void* mem = *a;
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+ size_t psize = chunksize(p);
+#if FOOTERS
+ if (get_mstate_for(p) != m) {
+ ++unfreed;
+ continue;
+ }
+#endif
+ check_inuse_chunk(m, p);
+ *a = 0;
+ if (RTCHECK(ok_address(m, p) && ok_inuse(p))) {
+ void ** b = a + 1; /* try to merge with next chunk */
+ mchunkptr next = next_chunk(p);
+ if (b != fence && *b == chunk2mem(next)) {
+ size_t newsize = chunksize(next) + psize;
+ set_inuse(m, p, newsize);
+ *b = chunk2mem(p);
+ }
+ else
+ dispose_chunk(m, p, psize);
+ }
+ else {
+ CORRUPTION_ERROR_ACTION(m);
+ break;
+ }
+ }
+ }
+ if (should_trim(m, m->topsize))
+ sys_trim(m, 0);
+ POSTACTION(m);
+ }
+ return unfreed;
+}
+
+/* Traversal */
+#if MALLOC_INSPECT_ALL
+static void internal_inspect_all(mstate m,
+ void(*handler)(void *start,
+ void *end,
+ size_t used_bytes,
+ void* callback_arg),
+ void* arg) {
+ if (is_initialized(m)) {
+ mchunkptr top = m->top;
+ msegmentptr s;
+ for (s = &m->seg; s != 0; s = s->next) {
+ mchunkptr q = align_as_chunk(s->base);
+ while (segment_holds(s, q) && q->head != FENCEPOST_HEAD) {
+ mchunkptr next = next_chunk(q);
+ size_t sz = chunksize(q);
+ size_t used;
+ void* start;
+ if (is_inuse(q)) {
+ used = sz - CHUNK_OVERHEAD; /* must not be mmapped */
+ start = chunk2mem(q);
+ }
+ else {
+ used = 0;
+ if (is_small(sz)) { /* offset by possible bookkeeping */
+ start = (void*)((char*)q + sizeof(malloc_chunk));
+ }
+ else {
+ start = (void*)((char*)q + sizeof(malloc_tree_chunk));
+ }
+ }
+ if (start < (void*)next) /* skip if all space is bookkeeping */
+ handler(start, next, used, arg);
+ if (q == top)
+ break;
+ q = next;
+ }
+ }
+ }
+}
+#endif /* MALLOC_INSPECT_ALL */
+
+/* ------------------ Exported realloc, memalign, etc -------------------- */
+
+#if !ONLY_MSPACES
+
+void* dlrealloc(void* oldmem, size_t bytes) {
+ void* mem = 0;
+ if (oldmem == 0) {
+ mem = dlmalloc(bytes);
+ }
+ else if (bytes >= MAX_REQUEST) {
+ MALLOC_FAILURE_ACTION;
+ }
+#ifdef REALLOC_ZERO_BYTES_FREES
+ else if (bytes == 0) {
+ dlfree(oldmem);
+ }
+#endif /* REALLOC_ZERO_BYTES_FREES */
+ else {
+ size_t nb = request2size(bytes);
+ mchunkptr oldp = mem2chunk(oldmem);
+#if ! FOOTERS
+ mstate m = gm;
+#else /* FOOTERS */
+ mstate m = get_mstate_for(oldp);
+ if (!ok_magic(m)) {
+ USAGE_ERROR_ACTION(m, oldmem);
+ return 0;
+ }
+#endif /* FOOTERS */
+ if (!PREACTION(m)) {
+ mchunkptr newp = try_realloc_chunk(m, oldp, nb, 1);
+ POSTACTION(m);
+ if (newp != 0) {
+ check_inuse_chunk(m, newp);
+ mem = chunk2mem(newp);
+ }
+ else {
+ mem = internal_malloc(m, bytes);
+ if (mem != 0) {
+ size_t oc = chunksize(oldp) - overhead_for(oldp);
+ memcpy(mem, oldmem, (oc < bytes)? oc : bytes);
+ internal_free(m, oldmem);
+ }
+ }
+ }
+ }
+ return mem;
+}
+
+void* dlrealloc_in_place(void* oldmem, size_t bytes) {
+ void* mem = 0;
+ if (oldmem != 0) {
+ if (bytes >= MAX_REQUEST) {
+ MALLOC_FAILURE_ACTION;
+ }
+ else {
+ size_t nb = request2size(bytes);
+ mchunkptr oldp = mem2chunk(oldmem);
+#if ! FOOTERS
+ mstate m = gm;
+#else /* FOOTERS */
+ mstate m = get_mstate_for(oldp);
+ if (!ok_magic(m)) {
+ USAGE_ERROR_ACTION(m, oldmem);
+ return 0;
+ }
+#endif /* FOOTERS */
+ if (!PREACTION(m)) {
+ mchunkptr newp = try_realloc_chunk(m, oldp, nb, 0);
+ POSTACTION(m);
+ if (newp == oldp) {
+ check_inuse_chunk(m, newp);
+ mem = oldmem;
+ }
+ }
+ }
+ }
+ return mem;
+}
+
+void* dlmemalign(size_t alignment, size_t bytes) {
+ if (alignment <= MALLOC_ALIGNMENT) {
+ return dlmalloc(bytes);
+ }
+ return internal_memalign(gm, alignment, bytes);
+}
+
+int dlposix_memalign(void** pp, size_t alignment, size_t bytes) {
+ void* mem = 0;
+ if (alignment == MALLOC_ALIGNMENT)
+ mem = dlmalloc(bytes);
+ else {
+ size_t d = alignment / sizeof(void*);
+ size_t r = alignment % sizeof(void*);
+ if (r != 0 || d == 0 || (d & (d-SIZE_T_ONE)) != 0)
+ return EINVAL;
+ else if (bytes >= MAX_REQUEST - alignment) {
+ if (alignment < MIN_CHUNK_SIZE)
+ alignment = MIN_CHUNK_SIZE;
+ mem = internal_memalign(gm, alignment, bytes);
+ }
+ }
+ if (mem == 0)
+ return ENOMEM;
+ else {
+ *pp = mem;
+ return 0;
+ }
+}
+
+void* dlvalloc(size_t bytes) {
+ size_t pagesz;
+ ensure_initialization();
+ pagesz = mparams.page_size;
+ return dlmemalign(pagesz, bytes);
+}
+
+void* dlpvalloc(size_t bytes) {
+ size_t pagesz;
+ ensure_initialization();
+ pagesz = mparams.page_size;
+ return dlmemalign(pagesz, (bytes + pagesz - SIZE_T_ONE) & ~(pagesz - SIZE_T_ONE));
+}
+
+void** dlindependent_calloc(size_t n_elements, size_t elem_size,
+ void* chunks[]) {
+ size_t sz = elem_size; /* serves as 1-element array */
+ return ialloc(gm, n_elements, &sz, 3, chunks);
+}
+
+void** dlindependent_comalloc(size_t n_elements, size_t sizes[],
+ void* chunks[]) {
+ return ialloc(gm, n_elements, sizes, 0, chunks);
+}
+
+size_t dlbulk_free(void* array[], size_t nelem) {
+ return internal_bulk_free(gm, array, nelem);
+}
+
+#if MALLOC_INSPECT_ALL
+void dlmalloc_inspect_all(void(*handler)(void *start,
+ void *end,
+ size_t used_bytes,
+ void* callback_arg),
+ void* arg) {
+ ensure_initialization();
+ if (!PREACTION(gm)) {
+ internal_inspect_all(gm, handler, arg);
+ POSTACTION(gm);
+ }
+}
+#endif /* MALLOC_INSPECT_ALL */
+
+int dlmalloc_trim(size_t pad) {
+ int result = 0;
+ ensure_initialization();
+ if (!PREACTION(gm)) {
+ result = sys_trim(gm, pad);
+ POSTACTION(gm);
+ }
+ return result;
+}
+
+size_t dlmalloc_footprint(void) {
+ return gm->footprint;
+}
+
+size_t dlmalloc_max_footprint(void) {
+ return gm->max_footprint;
+}
+
+size_t dlmalloc_footprint_limit(void) {
+ size_t maf = gm->footprint_limit;
+ return maf == 0 ? MAX_SIZE_T : maf;
+}
+
+size_t dlmalloc_set_footprint_limit(size_t bytes) {
+ size_t result; /* invert sense of 0 */
+ if (bytes == 0)
+ result = granularity_align(1); /* Use minimal size */
+ if (bytes == MAX_SIZE_T)
+ result = 0; /* disable */
+ else
+ result = granularity_align(bytes);
+ return gm->footprint_limit = result;
+}
+
+#if !NO_MALLINFO
+struct mallinfo dlmallinfo(void) {
+ return internal_mallinfo(gm);
+}
+#endif /* NO_MALLINFO */
+
+#if !NO_MALLOC_STATS
+void dlmalloc_stats() {
+ internal_malloc_stats(gm);
+}
+#endif /* NO_MALLOC_STATS */
+
+int dlmallopt(int param_number, int value) {
+ return change_mparam(param_number, value);
+}
+
+size_t dlmalloc_usable_size(void* mem) {
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+ if (is_inuse(p))
+ return chunksize(p) - overhead_for(p);
+ }
+ return 0;
+}
+
+#endif /* !ONLY_MSPACES */
+
+/* ----------------------------- user mspaces ---------------------------- */
+
+#if MSPACES
+
+static mstate init_user_mstate(char* tbase, size_t tsize) {
+ size_t msize = pad_request(sizeof(struct malloc_state));
+ mchunkptr mn;
+ mchunkptr msp = align_as_chunk(tbase);
+ mstate m = (mstate)(chunk2mem(msp));
+ memset(m, 0, msize);
+ (void)INITIAL_LOCK(&m->mutex);
+ msp->head = (msize|INUSE_BITS);
+ m->seg.base = m->least_addr = tbase;
+ m->seg.size = m->footprint = m->max_footprint = tsize;
+ m->magic = mparams.magic;
+ m->release_checks = MAX_RELEASE_CHECK_RATE;
+ m->mflags = mparams.default_mflags;
+ m->extp = 0;
+ m->exts = 0;
+ disable_contiguous(m);
+ init_bins(m);
+ mn = next_chunk(mem2chunk(m));
+ init_top(m, mn, (size_t)((tbase + tsize) - (char*)mn) - TOP_FOOT_SIZE);
+ check_top_chunk(m, m->top);
+ return m;
+}
+
+mspace create_mspace(size_t capacity, int locked) {
+ mstate m = 0;
+ size_t msize;
+ ensure_initialization();
+ msize = pad_request(sizeof(struct malloc_state));
+ if (capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {
+ size_t rs = ((capacity == 0)? mparams.granularity :
+ (capacity + TOP_FOOT_SIZE + msize));
+ size_t tsize = granularity_align(rs);
+ char* tbase = (char*)(CALL_MMAP(tsize));
+ if (tbase != CMFAIL) {
+ m = init_user_mstate(tbase, tsize);
+ m->seg.sflags = USE_MMAP_BIT;
+ set_lock(m, locked);
+ }
+ }
+ return (mspace)m;
+}
+
+mspace create_mspace_with_base(void* base, size_t capacity, int locked) {
+ mstate m = 0;
+ size_t msize;
+ ensure_initialization();
+ msize = pad_request(sizeof(struct malloc_state));
+ if (capacity > msize + TOP_FOOT_SIZE &&
+ capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {
+ m = init_user_mstate((char*)base, capacity);
+ m->seg.sflags = EXTERN_BIT;
+ set_lock(m, locked);
+ }
+ return (mspace)m;
+}
+
+int mspace_track_large_chunks(mspace msp, int enable) {
+ int ret = 0;
+ mstate ms = (mstate)msp;
+ if (!PREACTION(ms)) {
+ if (!use_mmap(ms))
+ ret = 1;
+ if (!enable)
+ enable_mmap(ms);
+ else
+ disable_mmap(ms);
+ POSTACTION(ms);
+ }
+ return ret;
+}
+
+size_t destroy_mspace(mspace msp) {
+ size_t freed = 0;
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ msegmentptr sp = &ms->seg;
+ (void)DESTROY_LOCK(&ms->mutex); /* destroy before unmapped */
+ while (sp != 0) {
+ char* base = sp->base;
+ size_t size = sp->size;
+ flag_t flag = sp->sflags;
+ sp = sp->next;
+ if ((flag & USE_MMAP_BIT) && !(flag & EXTERN_BIT) &&
+ CALL_MUNMAP(base, size) == 0)
+ freed += size;
+ }
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return freed;
+}
+
+/*
+ mspace versions of routines are near-clones of the global
+ versions. This is not so nice but better than the alternatives.
+*/
+
+void* mspace_malloc(mspace msp, size_t bytes) {
+ mstate ms = (mstate)msp;
+ if (!ok_magic(ms)) {
+ USAGE_ERROR_ACTION(ms,ms);
+ return 0;
+ }
+ if (!PREACTION(ms)) {
+ void* mem;
+ size_t nb;
+ if (bytes <= MAX_SMALL_REQUEST) {
+ bindex_t idx;
+ binmap_t smallbits;
+ nb = (bytes < MIN_REQUEST)? MIN_CHUNK_SIZE : pad_request(bytes);
+ idx = small_index(nb);
+ smallbits = ms->smallmap >> idx;
+
+ if ((smallbits & 0x3U) != 0) { /* Remainderless fit to a smallbin. */
+ mchunkptr b, p;
+ idx += ~smallbits & 1; /* Uses next bin if idx empty */
+ b = smallbin_at(ms, idx);
+ p = b->fd;
+ assert(chunksize(p) == small_index2size(idx));
+ unlink_first_small_chunk(ms, b, p, idx);
+ set_inuse_and_pinuse(ms, p, small_index2size(idx));
+ mem = chunk2mem(p);
+ check_malloced_chunk(ms, mem, nb);
+ goto postaction;
+ }
+
+ else if (nb > ms->dvsize) {
+ if (smallbits != 0) { /* Use chunk in next nonempty smallbin */
+ mchunkptr b, p, r;
+ size_t rsize;
+ bindex_t i;
+ binmap_t leftbits = (smallbits << idx) & left_bits(idx2bit(idx));
+ binmap_t leastbit = least_bit(leftbits);
+ compute_bit2idx(leastbit, i);
+ b = smallbin_at(ms, i);
+ p = b->fd;
+ assert(chunksize(p) == small_index2size(i));
+ unlink_first_small_chunk(ms, b, p, i);
+ rsize = small_index2size(i) - nb;
+ /* Fit here cannot be remainderless if 4byte sizes */
+ if (SIZE_T_SIZE != 4 && rsize < MIN_CHUNK_SIZE)
+ set_inuse_and_pinuse(ms, p, small_index2size(i));
+ else {
+ set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
+ r = chunk_plus_offset(p, nb);
+ set_size_and_pinuse_of_free_chunk(r, rsize);
+ replace_dv(ms, r, rsize);
+ }
+ mem = chunk2mem(p);
+ check_malloced_chunk(ms, mem, nb);
+ goto postaction;
+ }
+
+ else if (ms->treemap != 0 && (mem = tmalloc_small(ms, nb)) != 0) {
+ check_malloced_chunk(ms, mem, nb);
+ goto postaction;
+ }
+ }
+ }
+ else if (bytes >= MAX_REQUEST)
+ nb = MAX_SIZE_T; /* Too big to allocate. Force failure (in sys alloc) */
+ else {
+ nb = pad_request(bytes);
+ if (ms->treemap != 0 && (mem = tmalloc_large(ms, nb)) != 0) {
+ check_malloced_chunk(ms, mem, nb);
+ goto postaction;
+ }
+ }
+
+ if (nb <= ms->dvsize) {
+ size_t rsize = ms->dvsize - nb;
+ mchunkptr p = ms->dv;
+ if (rsize >= MIN_CHUNK_SIZE) { /* split dv */
+ mchunkptr r = ms->dv = chunk_plus_offset(p, nb);
+ ms->dvsize = rsize;
+ set_size_and_pinuse_of_free_chunk(r, rsize);
+ set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
+ }
+ else { /* exhaust dv */
+ size_t dvs = ms->dvsize;
+ ms->dvsize = 0;
+ ms->dv = 0;
+ set_inuse_and_pinuse(ms, p, dvs);
+ }
+ mem = chunk2mem(p);
+ check_malloced_chunk(ms, mem, nb);
+ goto postaction;
+ }
+
+ else if (nb < ms->topsize) { /* Split top */
+ size_t rsize = ms->topsize -= nb;
+ mchunkptr p = ms->top;
+ mchunkptr r = ms->top = chunk_plus_offset(p, nb);
+ r->head = rsize | PINUSE_BIT;
+ set_size_and_pinuse_of_inuse_chunk(ms, p, nb);
+ mem = chunk2mem(p);
+ check_top_chunk(ms, ms->top);
+ check_malloced_chunk(ms, mem, nb);
+ goto postaction;
+ }
+
+ mem = sys_alloc(ms, nb);
+
+ postaction:
+ POSTACTION(ms);
+ return mem;
+ }
+
+ return 0;
+}
+
+void mspace_free(mspace msp, void* mem) {
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+#if FOOTERS
+ mstate fm = get_mstate_for(p);
+ msp = msp; /* placate people compiling -Wunused */
+#else /* FOOTERS */
+ mstate fm = (mstate)msp;
+#endif /* FOOTERS */
+ if (!ok_magic(fm)) {
+ USAGE_ERROR_ACTION(fm, p);
+ return;
+ }
+ if (!PREACTION(fm)) {
+ check_inuse_chunk(fm, p);
+ if (RTCHECK(ok_address(fm, p) && ok_inuse(p))) {
+ size_t psize = chunksize(p);
+ mchunkptr next = chunk_plus_offset(p, psize);
+ if (!pinuse(p)) {
+ size_t prevsize = p->prev_foot;
+ if (is_mmapped(p)) {
+ psize += prevsize + MMAP_FOOT_PAD;
+ if (CALL_MUNMAP((char*)p - prevsize, psize) == 0)
+ fm->footprint -= psize;
+ goto postaction;
+ }
+ else {
+ mchunkptr prev = chunk_minus_offset(p, prevsize);
+ psize += prevsize;
+ p = prev;
+ if (RTCHECK(ok_address(fm, prev))) { /* consolidate backward */
+ if (p != fm->dv) {
+ unlink_chunk(fm, p, prevsize);
+ }
+ else if ((next->head & INUSE_BITS) == INUSE_BITS) {
+ fm->dvsize = psize;
+ set_free_with_pinuse(p, psize, next);
+ goto postaction;
+ }
+ }
+ else
+ goto erroraction;
+ }
+ }
+
+ if (RTCHECK(ok_next(p, next) && ok_pinuse(next))) {
+ if (!cinuse(next)) { /* consolidate forward */
+ if (next == fm->top) {
+ size_t tsize = fm->topsize += psize;
+ fm->top = p;
+ p->head = tsize | PINUSE_BIT;
+ if (p == fm->dv) {
+ fm->dv = 0;
+ fm->dvsize = 0;
+ }
+ if (should_trim(fm, tsize))
+ sys_trim(fm, 0);
+ goto postaction;
+ }
+ else if (next == fm->dv) {
+ size_t dsize = fm->dvsize += psize;
+ fm->dv = p;
+ set_size_and_pinuse_of_free_chunk(p, dsize);
+ goto postaction;
+ }
+ else {
+ size_t nsize = chunksize(next);
+ psize += nsize;
+ unlink_chunk(fm, next, nsize);
+ set_size_and_pinuse_of_free_chunk(p, psize);
+ if (p == fm->dv) {
+ fm->dvsize = psize;
+ goto postaction;
+ }
+ }
+ }
+ else
+ set_free_with_pinuse(p, psize, next);
+
+ if (is_small(psize)) {
+ insert_small_chunk(fm, p, psize);
+ check_free_chunk(fm, p);
+ }
+ else {
+ tchunkptr tp = (tchunkptr)p;
+ insert_large_chunk(fm, tp, psize);
+ check_free_chunk(fm, p);
+ if (--fm->release_checks == 0)
+ release_unused_segments(fm);
+ }
+ goto postaction;
+ }
+ }
+ erroraction:
+ USAGE_ERROR_ACTION(fm, p);
+ postaction:
+ POSTACTION(fm);
+ }
+ }
+}
+
+void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size) {
+ void* mem;
+ size_t req = 0;
+ mstate ms = (mstate)msp;
+ if (!ok_magic(ms)) {
+ USAGE_ERROR_ACTION(ms,ms);
+ return 0;
+ }
+ if (n_elements != 0) {
+ req = n_elements * elem_size;
+ if (((n_elements | elem_size) & ~(size_t)0xffff) &&
+ (req / n_elements != elem_size))
+ req = MAX_SIZE_T; /* force downstream failure on overflow */
+ }
+ mem = internal_malloc(ms, req);
+ if (mem != 0 && calloc_must_clear(mem2chunk(mem)))
+ memset(mem, 0, req);
+ return mem;
+}
+
+void* mspace_realloc(mspace msp, void* oldmem, size_t bytes) {
+ void* mem = 0;
+ if (oldmem == 0) {
+ mem = mspace_malloc(msp, bytes);
+ }
+ else if (bytes >= MAX_REQUEST) {
+ MALLOC_FAILURE_ACTION;
+ }
+#ifdef REALLOC_ZERO_BYTES_FREES
+ else if (bytes == 0) {
+ mspace_free(msp, oldmem);
+ }
+#endif /* REALLOC_ZERO_BYTES_FREES */
+ else {
+ size_t nb = request2size(bytes);
+ mchunkptr oldp = mem2chunk(oldmem);
+#if ! FOOTERS
+ mstate m = (mstate)msp;
+#else /* FOOTERS */
+ mstate m = get_mstate_for(oldp);
+ if (!ok_magic(m)) {
+ USAGE_ERROR_ACTION(m, oldmem);
+ return 0;
+ }
+#endif /* FOOTERS */
+ if (!PREACTION(m)) {
+ mchunkptr newp = try_realloc_chunk(m, oldp, nb, 1);
+ POSTACTION(m);
+ if (newp != 0) {
+ check_inuse_chunk(m, newp);
+ mem = chunk2mem(newp);
+ }
+ else {
+ mem = mspace_malloc(m, bytes);
+ if (mem != 0) {
+ size_t oc = chunksize(oldp) - overhead_for(oldp);
+ memcpy(mem, oldmem, (oc < bytes)? oc : bytes);
+ mspace_free(m, oldmem);
+ }
+ }
+ }
+ }
+ return mem;
+}
+
+void* mspace_realloc_in_place(mspace msp, void* oldmem, size_t bytes) {
+ void* mem = 0;
+ if (oldmem != 0) {
+ if (bytes >= MAX_REQUEST) {
+ MALLOC_FAILURE_ACTION;
+ }
+ else {
+ size_t nb = request2size(bytes);
+ mchunkptr oldp = mem2chunk(oldmem);
+#if ! FOOTERS
+ mstate m = (mstate)msp;
+#else /* FOOTERS */
+ mstate m = get_mstate_for(oldp);
+ msp = msp; /* placate people compiling -Wunused */
+ if (!ok_magic(m)) {
+ USAGE_ERROR_ACTION(m, oldmem);
+ return 0;
+ }
+#endif /* FOOTERS */
+ if (!PREACTION(m)) {
+ mchunkptr newp = try_realloc_chunk(m, oldp, nb, 0);
+ POSTACTION(m);
+ if (newp == oldp) {
+ check_inuse_chunk(m, newp);
+ mem = oldmem;
+ }
+ }
+ }
+ }
+ return mem;
+}
+
+void* mspace_memalign(mspace msp, size_t alignment, size_t bytes) {
+ mstate ms = (mstate)msp;
+ if (!ok_magic(ms)) {
+ USAGE_ERROR_ACTION(ms,ms);
+ return 0;
+ }
+ if (alignment <= MALLOC_ALIGNMENT)
+ return mspace_malloc(msp, bytes);
+ return internal_memalign(ms, alignment, bytes);
+}
+
+void** mspace_independent_calloc(mspace msp, size_t n_elements,
+ size_t elem_size, void* chunks[]) {
+ size_t sz = elem_size; /* serves as 1-element array */
+ mstate ms = (mstate)msp;
+ if (!ok_magic(ms)) {
+ USAGE_ERROR_ACTION(ms,ms);
+ return 0;
+ }
+ return ialloc(ms, n_elements, &sz, 3, chunks);
+}
+
+void** mspace_independent_comalloc(mspace msp, size_t n_elements,
+ size_t sizes[], void* chunks[]) {
+ mstate ms = (mstate)msp;
+ if (!ok_magic(ms)) {
+ USAGE_ERROR_ACTION(ms,ms);
+ return 0;
+ }
+ return ialloc(ms, n_elements, sizes, 0, chunks);
+}
+
+size_t mspace_bulk_free(mspace msp, void* array[], size_t nelem) {
+ return internal_bulk_free((mstate)msp, array, nelem);
+}
+
+#if MALLOC_INSPECT_ALL
+void mspace_inspect_all(mspace msp,
+ void(*handler)(void *start,
+ void *end,
+ size_t used_bytes,
+ void* callback_arg),
+ void* arg) {
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ if (!PREACTION(ms)) {
+ internal_inspect_all(ms, handler, arg);
+ POSTACTION(ms);
+ }
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+}
+#endif /* MALLOC_INSPECT_ALL */
+
+int mspace_trim(mspace msp, size_t pad) {
+ int result = 0;
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ if (!PREACTION(ms)) {
+ result = sys_trim(ms, pad);
+ POSTACTION(ms);
+ }
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return result;
+}
+
+#if !NO_MALLOC_STATS
+void mspace_malloc_stats(mspace msp) {
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ internal_malloc_stats(ms);
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+}
+#endif /* NO_MALLOC_STATS */
+
+size_t mspace_footprint(mspace msp) {
+ size_t result = 0;
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ result = ms->footprint;
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return result;
+}
+
+size_t mspace_max_footprint(mspace msp) {
+ size_t result = 0;
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ result = ms->max_footprint;
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return result;
+}
+
+size_t mspace_footprint_limit(mspace msp) {
+ size_t result = 0;
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ size_t maf = ms->footprint_limit;
+ result = (maf == 0) ? MAX_SIZE_T : maf;
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return result;
+}
+
+size_t mspace_set_footprint_limit(mspace msp, size_t bytes) {
+ size_t result = 0;
+ mstate ms = (mstate)msp;
+ if (ok_magic(ms)) {
+ if (bytes == 0)
+ result = granularity_align(1); /* Use minimal size */
+ if (bytes == MAX_SIZE_T)
+ result = 0; /* disable */
+ else
+ result = granularity_align(bytes);
+ ms->footprint_limit = result;
+ }
+ else {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return result;
+}
+
+#if !NO_MALLINFO
+struct mallinfo mspace_mallinfo(mspace msp) {
+ mstate ms = (mstate)msp;
+ if (!ok_magic(ms)) {
+ USAGE_ERROR_ACTION(ms,ms);
+ }
+ return internal_mallinfo(ms);
+}
+#endif /* NO_MALLINFO */
+
+size_t mspace_usable_size(void* mem) {
+ if (mem != 0) {
+ mchunkptr p = mem2chunk(mem);
+ if (is_inuse(p))
+ return chunksize(p) - overhead_for(p);
+ }
+ return 0;
+}
+
+int mspace_mallopt(int param_number, int value) {
+ return change_mparam(param_number, value);
+}
+
+#endif /* MSPACES */
+
+
+/* -------------------- Alternative MORECORE functions ------------------- */
+
+/*
+ Guidelines for creating a custom version of MORECORE:
+
+ * For best performance, MORECORE should allocate in multiples of pagesize.
+ * MORECORE may allocate more memory than requested. (Or even less,
+ but this will usually result in a malloc failure.)
+ * MORECORE must not allocate memory when given argument zero, but
+ instead return one past the end address of memory from previous
+ nonzero call.
+ * For best performance, consecutive calls to MORECORE with positive
+ arguments should return increasing addresses, indicating that
+ space has been contiguously extended.
+ * Even though consecutive calls to MORECORE need not return contiguous
+ addresses, it must be OK for malloc'ed chunks to span multiple
+ regions in those cases where they do happen to be contiguous.
+ * MORECORE need not handle negative arguments -- it may instead
+ just return MFAIL when given negative arguments.
+ Negative arguments are always multiples of pagesize. MORECORE
+ must not misinterpret negative args as large positive unsigned
+ args. You can suppress all such calls from even occurring by defining
+ MORECORE_CANNOT_TRIM,
+
+ As an example alternative MORECORE, here is a custom allocator
+ kindly contributed for pre-OSX macOS. It uses virtually but not
+ necessarily physically contiguous non-paged memory (locked in,
+ present and won't get swapped out). You can use it by uncommenting
+ this section, adding some #includes, and setting up the appropriate
+ defines above:
+
+ #define MORECORE osMoreCore
+
+ There is also a shutdown routine that should somehow be called for
+ cleanup upon program exit.
+
+ #define MAX_POOL_ENTRIES 100
+ #define MINIMUM_MORECORE_SIZE (64 * 1024U)
+ static int next_os_pool;
+ void *our_os_pools[MAX_POOL_ENTRIES];
+
+ void *osMoreCore(int size)
+ {
+ void *ptr = 0;
+ static void *sbrk_top = 0;
+
+ if (size > 0)
+ {
+ if (size < MINIMUM_MORECORE_SIZE)
+ size = MINIMUM_MORECORE_SIZE;
+ if (CurrentExecutionLevel() == kTaskLevel)
+ ptr = PoolAllocateResident(size + RM_PAGE_SIZE, 0);
+ if (ptr == 0)
+ {
+ return (void *) MFAIL;
+ }
+ // save ptrs so they can be freed during cleanup
+ our_os_pools[next_os_pool] = ptr;
+ next_os_pool++;
+ ptr = (void *) ((((size_t) ptr) + RM_PAGE_MASK) & ~RM_PAGE_MASK);
+ sbrk_top = (char *) ptr + size;
+ return ptr;
+ }
+ else if (size < 0)
+ {
+ // we don't currently support shrink behavior
+ return (void *) MFAIL;
+ }
+ else
+ {
+ return sbrk_top;
+ }
+ }
+
+ // cleanup any allocated memory pools
+ // called as last thing before shutting down driver
+
+ void osCleanupMem(void)
+ {
+ void **ptr;
+
+ for (ptr = our_os_pools; ptr < &our_os_pools[MAX_POOL_ENTRIES]; ptr++)
+ if (*ptr)
+ {
+ PoolDeallocate(*ptr);
+ *ptr = 0;
+ }
+ }
+
+*/
+
+
+/* -----------------------------------------------------------------------
+History:
+ v2.8.5 Sun May 22 10:26:02 2011 Doug Lea (dl at gee)
+ * Always perform unlink checks unless INSECURE
+ * Add posix_memalign.
+ * Improve realloc to expand in more cases; expose realloc_in_place.
+ Thanks to Peter Buhr for the suggestion.
+ * Add footprint_limit, inspect_all, bulk_free. Thanks
+ to Barry Hayes and others for the suggestions.
+ * Internal refactorings to avoid calls while holding locks
+ * Use non-reentrant locks by default. Thanks to Roland McGrath
+ for the suggestion.
+ * Small fixes to mspace_destroy, reset_on_error.
+ * Various configuration extensions/changes. Thanks
+ to all who contributed these.
+
+ V2.8.4a Thu Apr 28 14:39:43 2011 (dl at gee.cs.oswego.edu)
+ * Update Creative Commons URL
+
+ V2.8.4 Wed May 27 09:56:23 2009 Doug Lea (dl at gee)
+ * Use zeros instead of prev foot for is_mmapped
+ * Add mspace_track_large_chunks; thanks to Jean Brouwers
+ * Fix set_inuse in internal_realloc; thanks to Jean Brouwers
+ * Fix insufficient sys_alloc padding when using 16byte alignment
+ * Fix bad error check in mspace_footprint
+ * Adaptations for ptmalloc; thanks to Wolfram Gloger.
+ * Reentrant spin locks; thanks to Earl Chew and others
+ * Win32 improvements; thanks to Niall Douglas and Earl Chew
+ * Add NO_SEGMENT_TRAVERSAL and MAX_RELEASE_CHECK_RATE options
+ * Extension hook in malloc_state
+ * Various small adjustments to reduce warnings on some compilers
+ * Various configuration extensions/changes for more platforms. Thanks
+ to all who contributed these.
+
+ V2.8.3 Thu Sep 22 11:16:32 2005 Doug Lea (dl at gee)
+ * Add max_footprint functions
+ * Ensure all appropriate literals are size_t
+ * Fix conditional compilation problem for some #define settings
+ * Avoid concatenating segments with the one provided
+ in create_mspace_with_base
+ * Rename some variables to avoid compiler shadowing warnings
+ * Use explicit lock initialization.
+ * Better handling of sbrk interference.
+ * Simplify and fix segment insertion, trimming and mspace_destroy
+ * Reinstate REALLOC_ZERO_BYTES_FREES option from 2.7.x
+ * Thanks especially to Dennis Flanagan for help on these.
+
+ V2.8.2 Sun Jun 12 16:01:10 2005 Doug Lea (dl at gee)
+ * Fix memalign brace error.
+
+ V2.8.1 Wed Jun 8 16:11:46 2005 Doug Lea (dl at gee)
+ * Fix improper #endif nesting in C++
+ * Add explicit casts needed for C++
+
+ V2.8.0 Mon May 30 14:09:02 2005 Doug Lea (dl at gee)
+ * Use trees for large bins
+ * Support mspaces
+ * Use segments to unify sbrk-based and mmap-based system allocation,
+ removing need for emulation on most platforms without sbrk.
+ * Default safety checks
+ * Optional footer checks. Thanks to William Robertson for the idea.
+ * Internal code refactoring
+ * Incorporate suggestions and platform-specific changes.
+ Thanks to Dennis Flanagan, Colin Plumb, Niall Douglas,
+ Aaron Bachmann, Emery Berger, and others.
+ * Speed up non-fastbin processing enough to remove fastbins.
+ * Remove useless cfree() to avoid conflicts with other apps.
+ * Remove internal memcpy, memset. Compilers handle builtins better.
+ * Remove some options that no one ever used and rename others.
+
+ V2.7.2 Sat Aug 17 09:07:30 2002 Doug Lea (dl at gee)
+ * Fix malloc_state bitmap array misdeclaration
+
+ V2.7.1 Thu Jul 25 10:58:03 2002 Doug Lea (dl at gee)
+ * Allow tuning of FIRST_SORTED_BIN_SIZE
+ * Use PTR_UINT as type for all ptr->int casts. Thanks to John Belmonte.
+ * Better detection and support for non-contiguousness of MORECORE.
+ Thanks to Andreas Mueller, Conal Walsh, and Wolfram Gloger
+ * Bypass most of malloc if no frees. Thanks To Emery Berger.
+ * Fix freeing of old top non-contiguous chunk im sysmalloc.
+ * Raised default trim and map thresholds to 256K.
+ * Fix mmap-related #defines. Thanks to Lubos Lunak.
+ * Fix copy macros; added LACKS_FCNTL_H. Thanks to Neal Walfield.
+ * Branch-free bin calculation
+ * Default trim and mmap thresholds now 256K.
+
+ V2.7.0 Sun Mar 11 14:14:06 2001 Doug Lea (dl at gee)
+ * Introduce independent_comalloc and independent_calloc.
+ Thanks to Michael Pachos for motivation and help.
+ * Make optional .h file available
+ * Allow > 2GB requests on 32bit systems.
+ * new WIN32 sbrk, mmap, munmap, lock code from <Walter@GeNeSys-e.de>.
+ Thanks also to Andreas Mueller <a.mueller at paradatec.de>,
+ and Anonymous.
+ * Allow override of MALLOC_ALIGNMENT (Thanks to Ruud Waij for
+ helping test this.)
+ * memalign: check alignment arg
+ * realloc: don't try to shift chunks backwards, since this
+ leads to more fragmentation in some programs and doesn't
+ seem to help in any others.
+ * Collect all cases in malloc requiring system memory into sysmalloc
+ * Use mmap as backup to sbrk
+ * Place all internal state in malloc_state
+ * Introduce fastbins (although similar to 2.5.1)
+ * Many minor tunings and cosmetic improvements
+ * Introduce USE_PUBLIC_MALLOC_WRAPPERS, USE_MALLOC_LOCK
+ * Introduce MALLOC_FAILURE_ACTION, MORECORE_CONTIGUOUS
+ Thanks to Tony E. Bennett <tbennett@nvidia.com> and others.
+ * Include errno.h to support default failure action.
+
+ V2.6.6 Sun Dec 5 07:42:19 1999 Doug Lea (dl at gee)
+ * return null for negative arguments
+ * Added Several WIN32 cleanups from Martin C. Fong <mcfong at yahoo.com>
+ * Add 'LACKS_SYS_PARAM_H' for those systems without 'sys/param.h'
+ (e.g. WIN32 platforms)
+ * Cleanup header file inclusion for WIN32 platforms
+ * Cleanup code to avoid Microsoft Visual C++ compiler complaints
+ * Add 'USE_DL_PREFIX' to quickly allow co-existence with existing
+ memory allocation routines
+ * Set 'malloc_getpagesize' for WIN32 platforms (needs more work)
+ * Use 'assert' rather than 'ASSERT' in WIN32 code to conform to
+ usage of 'assert' in non-WIN32 code
+ * Improve WIN32 'sbrk()' emulation's 'findRegion()' routine to
+ avoid infinite loop
+ * Always call 'fREe()' rather than 'free()'
+
+ V2.6.5 Wed Jun 17 15:57:31 1998 Doug Lea (dl at gee)
+ * Fixed ordering problem with boundary-stamping
+
+ V2.6.3 Sun May 19 08:17:58 1996 Doug Lea (dl at gee)
+ * Added pvalloc, as recommended by H.J. Liu
+ * Added 64bit pointer support mainly from Wolfram Gloger
+ * Added anonymously donated WIN32 sbrk emulation
+ * Malloc, calloc, getpagesize: add optimizations from Raymond Nijssen
+ * malloc_extend_top: fix mask error that caused wastage after
+ foreign sbrks
+ * Add linux mremap support code from HJ Liu
+
+ V2.6.2 Tue Dec 5 06:52:55 1995 Doug Lea (dl at gee)
+ * Integrated most documentation with the code.
+ * Add support for mmap, with help from
+ Wolfram Gloger (Gloger@lrz.uni-muenchen.de).
+ * Use last_remainder in more cases.
+ * Pack bins using idea from colin@nyx10.cs.du.edu
+ * Use ordered bins instead of best-fit threshhold
+ * Eliminate block-local decls to simplify tracing and debugging.
+ * Support another case of realloc via move into top
+ * Fix error occuring when initial sbrk_base not word-aligned.
+ * Rely on page size for units instead of SBRK_UNIT to
+ avoid surprises about sbrk alignment conventions.
+ * Add mallinfo, mallopt. Thanks to Raymond Nijssen
+ (raymond@es.ele.tue.nl) for the suggestion.
+ * Add `pad' argument to malloc_trim and top_pad mallopt parameter.
+ * More precautions for cases where other routines call sbrk,
+ courtesy of Wolfram Gloger (Gloger@lrz.uni-muenchen.de).
+ * Added macros etc., allowing use in linux libc from
+ H.J. Lu (hjl@gnu.ai.mit.edu)
+ * Inverted this history list
+
+ V2.6.1 Sat Dec 2 14:10:57 1995 Doug Lea (dl at gee)
+ * Re-tuned and fixed to behave more nicely with V2.6.0 changes.
+ * Removed all preallocation code since under current scheme
+ the work required to undo bad preallocations exceeds
+ the work saved in good cases for most test programs.
+ * No longer use return list or unconsolidated bins since
+ no scheme using them consistently outperforms those that don't
+ given above changes.
+ * Use best fit for very large chunks to prevent some worst-cases.
+ * Added some support for debugging
+
+ V2.6.0 Sat Nov 4 07:05:23 1995 Doug Lea (dl at gee)
+ * Removed footers when chunks are in use. Thanks to
+ Paul Wilson (wilson@cs.texas.edu) for the suggestion.
+
+ V2.5.4 Wed Nov 1 07:54:51 1995 Doug Lea (dl at gee)
+ * Added malloc_trim, with help from Wolfram Gloger
+ (wmglo@Dent.MED.Uni-Muenchen.DE).
+
+ V2.5.3 Tue Apr 26 10:16:01 1994 Doug Lea (dl at g)
+
+ V2.5.2 Tue Apr 5 16:20:40 1994 Doug Lea (dl at g)
+ * realloc: try to expand in both directions
+ * malloc: swap order of clean-bin strategy;
+ * realloc: only conditionally expand backwards
+ * Try not to scavenge used bins
+ * Use bin counts as a guide to preallocation
+ * Occasionally bin return list chunks in first scan
+ * Add a few optimizations from colin@nyx10.cs.du.edu
+
+ V2.5.1 Sat Aug 14 15:40:43 1993 Doug Lea (dl at g)
+ * faster bin computation & slightly different binning
+ * merged all consolidations to one part of malloc proper
+ (eliminating old malloc_find_space & malloc_clean_bin)
+ * Scan 2 returns chunks (not just 1)
+ * Propagate failure in realloc if malloc returns 0
+ * Add stuff to allow compilation on non-ANSI compilers
+ from kpv@research.att.com
+
+ V2.5 Sat Aug 7 07:41:59 1993 Doug Lea (dl at g.oswego.edu)
+ * removed potential for odd address access in prev_chunk
+ * removed dependency on getpagesize.h
+ * misc cosmetics and a bit more internal documentation
+ * anticosmetics: mangled names in macros to evade debugger strangeness
+ * tested on sparc, hp-700, dec-mips, rs6000
+ with gcc & native cc (hp, dec only) allowing
+ Detlefs & Zorn comparison study (in SIGPLAN Notices.)
+
+ Trial version Fri Aug 28 13:14:29 1992 Doug Lea (dl at g.oswego.edu)
+ * Based loosely on libg++-1.2X malloc. (It retains some of the overall
+ structure of old version, but most details differ.)
+
+*/
+#endif
+
+#ifdef TEST
+#include "_PDCLIB_test.h"
+
+/* TODO: TEST ME */
+int main( void )
+{
+ return TEST_RESULTS;
+}
+
+#endif
projects / pdclib / commitdiff