--- /dev/null
+/* ANTLRTokenBuffer.C
+ *
+ * SOFTWARE RIGHTS
+ *
+ * We reserve no LEGAL rights to the Purdue Compiler Construction Tool
+ * Set (PCCTS) -- PCCTS is in the public domain. An individual or
+ * company may do whatever they wish with source code distributed with
+ * PCCTS or the code generated by PCCTS, including the incorporation of
+ * PCCTS, or its output, into commerical software.
+ *
+ * We encourage users to develop software with PCCTS. However, we do ask
+ * that credit is given to us for developing PCCTS. By "credit",
+ * we mean that if you incorporate our source code into one of your
+ * programs (commercial product, research project, or otherwise) that you
+ * acknowledge this fact somewhere in the documentation, research report,
+ * etc... If you like PCCTS and have developed a nice tool with the
+ * output, please mention that you developed it using PCCTS. In
+ * addition, we ask that this header remain intact in our source code.
+ * As long as these guidelines are kept, we expect to continue enhancing
+ * this system and expect to make other tools available as they are
+ * completed.
+ *
+ * ANTLR 1.33
+ * Terence Parr
+ * Parr Research Corporation
+ * with Purdue University and AHPCRC, University of Minnesota
+ * 1989-1995
+ */
+
+typedef int ANTLRTokenType; // fool AToken.h into compiling
+
+#define ANTLR_SUPPORT_CODE
+
+#include "config.h"
+#include ATOKENBUFFER_H
+typedef ANTLRAbstractToken *_ANTLRTokenPtr;
+
+#if defined(DBG_TBUF)||defined(DBG_TBUF_MARK_REW)
+static unsigned char test[1000];
+#endif
+
+#ifdef DBG_REFCOUNTTOKEN
+int ANTLRCommonToken::ctor = 0;
+int ANTLRCommonToken::dtor = 0;
+#endif
+
+ANTLRTokenBuffer::
+ANTLRTokenBuffer(ANTLRTokenStream *_input, int _k, int _cs)
+{
+ this->input = _input;
+ this->k = _k;
+ buffer_size = chunk_size = _cs;
+ buffer = (_ANTLRTokenPtr *)
+ calloc(chunk_size+1,sizeof(_ANTLRTokenPtr ));
+ if ( buffer == NULL ) {
+ panic("cannot alloc token buffer");
+ }
+ buffer++; // leave the first elem empty so tp-1 is valid ptr
+
+ tp = &buffer[0];
+ last = tp-1;
+ next = &buffer[0];
+ num_markers = 0;
+ end_of_buffer = &buffer[buffer_size-1];
+ threshold = &buffer[(int)(buffer_size*(1.0/2.0))];
+ _deleteTokens = 1; // assume we delete tokens
+}
+
+static void f() {;}
+ANTLRTokenBuffer::
+~ANTLRTokenBuffer()
+{
+ f();
+ // Delete all remaining tokens (from 0..last inclusive)
+ if ( _deleteTokens )
+ {
+ _ANTLRTokenPtr *z;
+ for (z=buffer; z<=last; z++)
+ {
+ (*z)->deref();
+// z->deref();
+#ifdef DBG_REFCOUNTTOKEN
+ fprintf(stderr, "##########dtor: deleting token '%s' (ref %d)\n",
+ ((ANTLRCommonToken *)*z)->getText(), (*z)->nref());
+#endif
+ if ( (*z)->nref()==0 )
+ {
+ delete (*z);
+ }
+ }
+ }
+
+ if ( buffer!=NULL ) free((char *)(buffer-1));
+}
+
+#if defined(DBG_TBUF)||defined(DBG_TBUF_MARK_REW)
+#include <stdio.h>
+#endif
+
+_ANTLRTokenPtr ANTLRTokenBuffer::
+getToken()
+{
+ if ( tp <= last ) // is there any buffered lookahead still to be read?
+ {
+ return *tp++; // read buffered lookahead
+ }
+ // out of buffered lookahead, get some more "real"
+ // input from getANTLRToken()
+ if ( num_markers==0 )
+ {
+ if( next > threshold )
+ {
+#ifdef DBG_TBUF
+fprintf(stderr,"getToken: next > threshold (high water is %d)\n", threshold-buffer);
+#endif
+ makeRoom();
+ }
+ }
+ else {
+ if ( next > end_of_buffer )
+ {
+#ifdef DBG_TBUF
+fprintf(stderr,"getToken: next > end_of_buffer (size is %d)\n", buffer_size);
+#endif
+ extendBuffer();
+ }
+ }
+ *next = getANTLRToken();
+ (*next)->ref(); // say we have a copy of this pointer in buffer
+ last = next;
+ next++;
+ tp = last;
+ return *tp++;
+}
+
+void ANTLRTokenBuffer::
+rewind(int pos)
+{
+#if defined(DBG_TBUF)||defined(DBG_TBUF_MARK_REW)
+ fprintf(stderr, "rewind(%d)[nm=%d,from=%d,%d.n=%d]\n", pos, num_markers, tp-buffer,pos,test[pos]);
+ test[pos]--;
+#endif
+ tp = &buffer[pos];
+ num_markers--;
+}
+
+/*
+ * This function is used to specify that the token pointers read
+ * by the ANTLRTokenBuffer should be buffered up (to be reused later).
+ */
+int ANTLRTokenBuffer::
+mark()
+{
+#if defined(DBG_TBUF)||defined(DBG_TBUF_MARK_REW)
+ test[tp-buffer]++;
+ fprintf(stderr,"mark(%d)[nm=%d,%d.n=%d]\n",tp-buffer,num_markers+1,tp-buffer,test[tp-buffer]);
+#endif
+ num_markers++;
+ return tp - buffer;
+}
+
+/*
+ * returns the token pointer n positions ahead.
+ * This implies that bufferedToken(1) gets the NEXT symbol of lookahead.
+ * This is used in conjunction with the ANTLRParser lookahead buffer.
+ *
+ * No markers are set or anything. A bunch of input is buffered--that's all.
+ * The tp pointer is left alone as the lookahead has not been advanced
+ * with getToken(). The next call to getToken() will find a token
+ * in the buffer and won't have to call getANTLRToken().
+ *
+ * If this is called before a consume() is done, how_many_more_i_need is
+ * set to 'n'.
+ */
+_ANTLRTokenPtr ANTLRTokenBuffer::
+bufferedToken(int n)
+{
+// int how_many_more_i_need = (last-tp < 0) ? n : n-(last-tp)-1;
+ int how_many_more_i_need = (tp > last) ? n : n-(last-tp)-1;
+ // Make sure that at least n tokens are available in the buffer
+#ifdef DBG_TBUF
+ fprintf(stderr, "bufferedToken(%d)\n", n);
+#endif
+ for (int i=1; i<=how_many_more_i_need; i++)
+ {
+ if ( next > end_of_buffer ) // buffer overflow?
+ {
+ extendBuffer();
+ }
+ *next = getANTLRToken();
+ (*next)->ref(); // say we have a copy of this pointer in buffer
+ last = next;
+ next++;
+ }
+ return tp[n - 1];
+}
+
+/* If no markers are set, the none of the input needs to be saved (except
+ * for the lookahead Token pointers). We save only k-1 token pointers as
+ * we are guaranteed to do a getANTLRToken() right after this because otherwise
+ * we wouldn't have needed to extend the buffer.
+ *
+ * If there are markers in the buffer, we need to save things and so
+ * extendBuffer() is called.
+ */
+void ANTLRTokenBuffer::
+makeRoom()
+{
+#ifdef DBG_TBUF
+ fprintf(stderr, "in makeRoom.................\n");
+ fprintf(stderr, "num_markers==%d\n", num_markers);
+#endif
+/*
+ if ( num_markers == 0 )
+ {
+*/
+#ifdef DBG_TBUF
+ fprintf(stderr, "moving lookahead and resetting next\n");
+
+ _ANTLRTokenPtr *r;
+ fprintf(stderr, "tbuf = [");
+ for (r=buffer; r<=last; r++)
+ {
+ if ( *r==NULL ) fprintf(stderr, " xxx");
+ else fprintf(stderr, " '%s'", ((ANTLRCommonToken *)*r)->getText());
+ }
+ fprintf(stderr, " ]\n");
+
+ fprintf(stderr,
+ "before: tp=%d, last=%d, next=%d, threshold=%d\n",tp-buffer,last-buffer,next-buffer,threshold-buffer);
+#endif
+
+ // Delete all tokens from 0..last-(k-1) inclusive
+ if ( _deleteTokens )
+ {
+ _ANTLRTokenPtr *z;
+ for (z=buffer; z<=last-(k-1); z++)
+ {
+ (*z)->deref();
+// z->deref();
+#ifdef DBG_REFCOUNTTOKEN
+ fprintf(stderr, "##########makeRoom: deleting token '%s' (ref %d)\n",
+ ((ANTLRCommonToken *)*z)->getText(), (*z)->nref());
+#endif
+ if ( (*z)->nref()==0 )
+ {
+ delete (*z);
+ }
+ }
+ }
+
+ // reset the buffer to initial conditions, but move k-1 symbols
+ // to the beginning of buffer and put new input symbol at k
+ _ANTLRTokenPtr *p = buffer, *q = last-(k-1)+1;
+// ANTLRAbstractToken **p = buffer, **q = end_of_buffer-(k-1)+1;
+#ifdef DBG_TBUF
+ fprintf(stderr, "lookahead buffer = [");
+#endif
+ for (int i=1; i<=(k-1); i++)
+ {
+ *p++ = *q++;
+#ifdef DBG_TBUF
+ fprintf(stderr,
+ " '%s'", ((ANTLRCommonToken *)buffer[i-1])->getText());
+#endif
+ }
+#ifdef DBG_TBUF
+ fprintf(stderr, " ]\n");
+#endif
+ next = &buffer[k-1];
+ tp = &buffer[k-1]; // tp points to what will be filled in next
+ last = tp-1;
+#ifdef DBG_TBUF
+ fprintf(stderr,
+ "after: tp=%d, last=%d, next=%d\n",
+ tp-buffer, last-buffer, next-buffer);
+#endif
+/*
+ }
+ else {
+ extendBuffer();
+ }
+*/
+}
+
+/* This function extends 'buffer' by chunk_size and returns with all
+ * pointers at the same relative positions in the buffer (the buffer base
+ * address could have changed in realloc()) except that 'next' comes
+ * back set to where the next token should be stored. All other pointers
+ * are untouched.
+ */
+void
+ANTLRTokenBuffer::
+extendBuffer()
+{
+ int save_last = last-buffer, save_tp = tp-buffer, save_next = next-buffer;
+#ifdef DBG_TBUF
+ fprintf(stderr, "extending physical buffer\n");
+#endif
+ buffer_size += chunk_size;
+ buffer = (_ANTLRTokenPtr *)
+ realloc((char *)(buffer-1),
+ (buffer_size+1)*sizeof(_ANTLRTokenPtr ));
+ if ( buffer == NULL ) {
+ panic("cannot alloc token buffer");
+ }
+ buffer++; // leave the first elem empty so tp-1 is valid ptr
+
+ tp = buffer + save_tp; // put the pointers back to same relative position
+ last = buffer + save_last;
+ next = buffer + save_next;
+ end_of_buffer = &buffer[buffer_size-1];
+ threshold = &buffer[(int)(buffer_size*(1.0/2.0))];
+
+/*
+ // zero out new token ptrs so we'll know if something to delete in buffer
+ ANTLRAbstractToken **p = end_of_buffer-chunk_size+1;
+ for (; p<=end_of_buffer; p++) *p = NULL;
+*/
+}
+
+/* to avoid having to link in another file just for the smart token ptr
+ * stuff, we include it here. Ugh.
+ */
+#include ATOKPTR_C
projects / pccts / blobdiff