2 * xmlmemory.c: libxml memory allocator wrapper.
12 #ifdef HAVE_SYS_TYPES_H
13 #include <sys/types.h>
32 /* #define DEBUG_MEMORY */
37 * keep track of all allocated blocks for error reporting
38 * Always build the memory list !
40 #ifdef DEBUG_MEMORY_LOCATION
42 #define MEM_LIST /* keep a list of all the allocated memory blocks */
46 #include <libxml/globals.h> /* must come before xmlmemory.h */
47 #include <libxml/xmlmemory.h>
48 #include <libxml/xmlerror.h>
49 #include <libxml/threads.h>
51 static int xmlMemInitialized = 0;
52 static unsigned long debugMemSize = 0;
53 static unsigned long debugMemBlocks = 0;
54 static unsigned long debugMaxMemSize = 0;
55 static xmlMutexPtr xmlMemMutex = NULL;
57 void xmlMallocBreakpoint(void);
59 /************************************************************************
61 * Macros, variables and associated types *
63 ************************************************************************/
65 #if !defined(LIBXML_THREAD_ENABLED) && !defined(LIBXML_THREAD_ALLOC_ENABLED)
78 * Each of the blocks allocated begin with a header containing informations
84 #define REALLOC_TYPE 2
86 #define MALLOC_ATOMIC_TYPE 4
87 #define REALLOC_ATOMIC_TYPE 5
89 typedef struct memnod {
92 unsigned long mh_number;
95 struct memnod *mh_next;
96 struct memnod *mh_prev;
104 #define ALIGN_SIZE 16
106 #define ALIGN_SIZE sizeof(double)
108 #define HDR_SIZE sizeof(MEMHDR)
109 #define RESERVE_SIZE (((HDR_SIZE + (ALIGN_SIZE-1)) \
110 / ALIGN_SIZE ) * ALIGN_SIZE)
112 #define MAX_SIZE_T ((size_t)-1)
114 #define CLIENT_2_HDR(a) ((MEMHDR *) (((char *) (a)) - RESERVE_SIZE))
115 #define HDR_2_CLIENT(a) ((void *) (((char *) (a)) + RESERVE_SIZE))
118 static unsigned int block=0;
119 static unsigned int xmlMemStopAtBlock = 0;
120 static void *xmlMemTraceBlockAt = NULL;
122 static MEMHDR *memlist = NULL;
125 static void debugmem_tag_error(void *addr);
127 static void debugmem_list_add(MEMHDR *);
128 static void debugmem_list_delete(MEMHDR *);
130 #define Mem_Tag_Err(a) debugmem_tag_error(a);
137 * xmlMallocBreakpoint:
139 * Breakpoint to use in conjunction with xmlMemStopAtBlock. When the block
140 * number reaches the specified value this function is called. One need to add a breakpoint
141 * to it to get the context in which the given block is allocated.
145 xmlMallocBreakpoint(void) {
146 xmlGenericError(xmlGenericErrorContext,
147 "xmlMallocBreakpoint reached on block %d\n", xmlMemStopAtBlock);
152 * @size: an int specifying the size in byte to allocate.
153 * @file: the file name or NULL
154 * @line: the line number
156 * a malloc() equivalent, with logging of the allocation info.
158 * Returns a pointer to the allocated area or NULL in case of lack of memory.
162 xmlMallocLoc(size_t size, const char * file, int line)
167 if (!xmlMemInitialized) xmlInitMemory();
169 xmlGenericError(xmlGenericErrorContext,
170 "Malloc(%d)\n",size);
175 p = (MEMHDR *) malloc(RESERVE_SIZE+size);
178 xmlGenericError(xmlGenericErrorContext,
179 "xmlMallocLoc : Out of free space\n");
185 p->mh_type = MALLOC_TYPE;
188 xmlMutexLock(xmlMemMutex);
189 p->mh_number = ++block;
190 debugMemSize += size;
192 if (debugMemSize > debugMaxMemSize) debugMaxMemSize = debugMemSize;
194 debugmem_list_add(p);
196 xmlMutexUnlock(xmlMemMutex);
199 xmlGenericError(xmlGenericErrorContext,
200 "Malloc(%d) Ok\n",size);
203 if (xmlMemStopAtBlock == p->mh_number) xmlMallocBreakpoint();
205 ret = HDR_2_CLIENT(p);
207 if (xmlMemTraceBlockAt == ret) {
208 xmlGenericError(xmlGenericErrorContext,
209 "%p : Malloc(%lu) Ok\n", xmlMemTraceBlockAt,
210 (long unsigned)size);
211 xmlMallocBreakpoint();
220 * xmlMallocAtomicLoc:
221 * @size: an unsigned int specifying the size in byte to allocate.
222 * @file: the file name or NULL
223 * @line: the line number
225 * a malloc() equivalent, with logging of the allocation info.
227 * Returns a pointer to the allocated area or NULL in case of lack of memory.
231 xmlMallocAtomicLoc(size_t size, const char * file, int line)
236 if (!xmlMemInitialized) xmlInitMemory();
238 xmlGenericError(xmlGenericErrorContext,
239 "Malloc(%d)\n",size);
244 if (size > (MAX_SIZE_T - RESERVE_SIZE)) {
245 xmlGenericError(xmlGenericErrorContext,
246 "xmlMallocAtomicLoc : Unsigned overflow prevented\n");
251 p = (MEMHDR *) malloc(RESERVE_SIZE+size);
254 xmlGenericError(xmlGenericErrorContext,
255 "xmlMallocAtomicLoc : Out of free space\n");
261 p->mh_type = MALLOC_ATOMIC_TYPE;
264 xmlMutexLock(xmlMemMutex);
265 p->mh_number = ++block;
266 debugMemSize += size;
268 if (debugMemSize > debugMaxMemSize) debugMaxMemSize = debugMemSize;
270 debugmem_list_add(p);
272 xmlMutexUnlock(xmlMemMutex);
275 xmlGenericError(xmlGenericErrorContext,
276 "Malloc(%d) Ok\n",size);
279 if (xmlMemStopAtBlock == p->mh_number) xmlMallocBreakpoint();
281 ret = HDR_2_CLIENT(p);
283 if (xmlMemTraceBlockAt == ret) {
284 xmlGenericError(xmlGenericErrorContext,
285 "%p : Malloc(%lu) Ok\n", xmlMemTraceBlockAt,
286 (long unsigned)size);
287 xmlMallocBreakpoint();
296 * @size: an int specifying the size in byte to allocate.
298 * a malloc() equivalent, with logging of the allocation info.
300 * Returns a pointer to the allocated area or NULL in case of lack of memory.
304 xmlMemMalloc(size_t size)
306 return(xmlMallocLoc(size, "none", 0));
311 * @ptr: the initial memory block pointer
312 * @size: an int specifying the size in byte to allocate.
313 * @file: the file name or NULL
314 * @line: the line number
316 * a realloc() equivalent, with logging of the allocation info.
318 * Returns a pointer to the allocated area or NULL in case of lack of memory.
322 xmlReallocLoc(void *ptr,size_t size, const char * file, int line)
325 unsigned long number;
331 return(xmlMallocLoc(size, file, line));
333 if (!xmlMemInitialized) xmlInitMemory();
336 p = CLIENT_2_HDR(ptr);
337 number = p->mh_number;
338 if (xmlMemStopAtBlock == number) xmlMallocBreakpoint();
339 if (p->mh_tag != MEMTAG) {
344 xmlMutexLock(xmlMemMutex);
345 debugMemSize -= p->mh_size;
348 oldsize = p->mh_size;
351 debugmem_list_delete(p);
353 xmlMutexUnlock(xmlMemMutex);
355 tmp = (MEMHDR *) realloc(p,RESERVE_SIZE+size);
361 if (xmlMemTraceBlockAt == ptr) {
362 xmlGenericError(xmlGenericErrorContext,
363 "%p : Realloced(%lu -> %lu) Ok\n",
364 xmlMemTraceBlockAt, (long unsigned)p->mh_size,
365 (long unsigned)size);
366 xmlMallocBreakpoint();
369 p->mh_number = number;
370 p->mh_type = REALLOC_TYPE;
374 xmlMutexLock(xmlMemMutex);
375 debugMemSize += size;
377 if (debugMemSize > debugMaxMemSize) debugMaxMemSize = debugMemSize;
379 debugmem_list_add(p);
381 xmlMutexUnlock(xmlMemMutex);
386 xmlGenericError(xmlGenericErrorContext,
387 "Realloced(%d to %d) Ok\n", oldsize, size);
389 return(HDR_2_CLIENT(p));
397 * @ptr: the initial memory block pointer
398 * @size: an int specifying the size in byte to allocate.
400 * a realloc() equivalent, with logging of the allocation info.
402 * Returns a pointer to the allocated area or NULL in case of lack of memory.
406 xmlMemRealloc(void *ptr,size_t size) {
407 return(xmlReallocLoc(ptr, size, "none", 0));
412 * @ptr: the memory block pointer
414 * a free() equivalent, with error checking.
417 xmlMemFree(void *ptr)
428 if (ptr == (void *) -1) {
429 xmlGenericError(xmlGenericErrorContext,
430 "trying to free pointer from freed area\n");
434 if (xmlMemTraceBlockAt == ptr) {
435 xmlGenericError(xmlGenericErrorContext,
436 "%p : Freed()\n", xmlMemTraceBlockAt);
437 xmlMallocBreakpoint();
442 target = (char *) ptr;
444 p = CLIENT_2_HDR(ptr);
445 if (p->mh_tag != MEMTAG) {
449 if (xmlMemStopAtBlock == p->mh_number) xmlMallocBreakpoint();
451 memset(target, -1, p->mh_size);
452 xmlMutexLock(xmlMemMutex);
453 debugMemSize -= p->mh_size;
459 debugmem_list_delete(p);
461 xmlMutexUnlock(xmlMemMutex);
468 xmlGenericError(xmlGenericErrorContext,
469 "Freed(%d) Ok\n", size);
475 xmlGenericError(xmlGenericErrorContext,
476 "xmlMemFree(%lX) error\n", (unsigned long) ptr);
477 xmlMallocBreakpoint();
483 * @str: the initial string pointer
484 * @file: the file name or NULL
485 * @line: the line number
487 * a strdup() equivalent, with logging of the allocation info.
489 * Returns a pointer to the new string or NULL if allocation error occurred.
493 xmlMemStrdupLoc(const char *str, const char *file, int line)
496 size_t size = strlen(str) + 1;
499 if (!xmlMemInitialized) xmlInitMemory();
502 p = (MEMHDR *) malloc(RESERVE_SIZE+size);
508 p->mh_type = STRDUP_TYPE;
511 xmlMutexLock(xmlMemMutex);
512 p->mh_number = ++block;
513 debugMemSize += size;
515 if (debugMemSize > debugMaxMemSize) debugMaxMemSize = debugMemSize;
517 debugmem_list_add(p);
519 xmlMutexUnlock(xmlMemMutex);
521 s = (char *) HDR_2_CLIENT(p);
523 if (xmlMemStopAtBlock == p->mh_number) xmlMallocBreakpoint();
529 if (xmlMemTraceBlockAt == s) {
530 xmlGenericError(xmlGenericErrorContext,
531 "%p : Strdup() Ok\n", xmlMemTraceBlockAt);
532 xmlMallocBreakpoint();
543 * @str: the initial string pointer
545 * a strdup() equivalent, with logging of the allocation info.
547 * Returns a pointer to the new string or NULL if allocation error occurred.
551 xmlMemoryStrdup(const char *str) {
552 return(xmlMemStrdupLoc(str, "none", 0));
558 * Provides the amount of memory currently allocated
560 * Returns an int representing the amount of memory allocated.
567 xmlMutexLock(xmlMemMutex);
569 xmlMutexUnlock(xmlMemMutex);
576 * Provides the number of memory areas currently allocated
578 * Returns an int representing the number of blocks
585 xmlMutexLock(xmlMemMutex);
586 res = debugMemBlocks;
587 xmlMutexUnlock(xmlMemMutex);
594 * @fp: a FILE descriptor used as the output file
595 * @p: a memory block header
597 * tries to show some content from the memory block
601 xmlMemContentShow(FILE *fp, MEMHDR *p)
607 fprintf(fp, " NULL");
611 buf = (const char *) HDR_2_CLIENT(p);
613 for (i = 0;i < len;i++) {
614 if (buf[i] == 0) break;
615 if (!isprint((unsigned char) buf[i])) break;
617 if ((i < 4) && ((buf[i] != 0) || (i == 0))) {
622 for (j = 0;(j < len -3) && (j < 40);j += 4) {
623 cur = *((void **) &buf[j]);
624 q = CLIENT_2_HDR(cur);
630 if (k++ > 100) break;
632 if ((p != NULL) && (p == q)) {
633 fprintf(fp, " pointer to #%lu at index %d",
639 } else if ((i == 0) && (buf[i] == 0)) {
642 if (buf[i] == 0) fprintf(fp," \"%.25s\"", buf);
645 for (j = 0;j < i;j++)
646 fprintf(fp,"%c", buf[j]);
655 * @fp: a FILE descriptor used as the output file, if NULL, the result is
656 * written to the file .memorylist
657 * @nbBytes: the amount of memory to dump
659 * the last nbBytes of memory allocated and not freed, useful for dumping
660 * the memory left allocated between two places at runtime.
664 xmlMemDisplayLast(FILE *fp, long nbBytes)
677 fp = fopen(".memorylist", "w");
683 fprintf(fp," Last %li MEMORY ALLOCATED : %lu, MAX was %lu\n",
684 nbBytes, debugMemSize, debugMaxMemSize);
685 fprintf(fp,"BLOCK NUMBER SIZE TYPE\n");
687 xmlMutexLock(xmlMemMutex);
689 while ((p) && (nbBytes > 0)) {
690 fprintf(fp,"%-5u %6lu %6lu ",idx++,p->mh_number,
691 (unsigned long)p->mh_size);
692 switch (p->mh_type) {
693 case STRDUP_TYPE:fprintf(fp,"strdup() in ");break;
694 case MALLOC_TYPE:fprintf(fp,"malloc() in ");break;
695 case REALLOC_TYPE:fprintf(fp,"realloc() in ");break;
696 case MALLOC_ATOMIC_TYPE:fprintf(fp,"atomicmalloc() in ");break;
697 case REALLOC_ATOMIC_TYPE:fprintf(fp,"atomicrealloc() in ");break;
699 fprintf(fp,"Unknown memory block, may be corrupted");
700 xmlMutexUnlock(xmlMemMutex);
705 if (p->mh_file != NULL) fprintf(fp,"%s(%u)", p->mh_file, p->mh_line);
706 if (p->mh_tag != MEMTAG)
707 fprintf(fp," INVALID");
710 xmlMemContentShow(fp, p);
715 nbBytes -= (unsigned long)p->mh_size;
718 xmlMutexUnlock(xmlMemMutex);
720 fprintf(fp,"Memory list not compiled (MEM_LIST not defined !)\n");
728 * @fp: a FILE descriptor used as the output file, if NULL, the result is
729 * written to the file .memorylist
731 * show in-extenso the memory blocks allocated
735 xmlMemDisplay(FILE *fp)
741 #if defined(HAVE_LOCALTIME) && defined(HAVE_STRFTIME)
750 fp = fopen(".memorylist", "w");
756 #if defined(HAVE_LOCALTIME) && defined(HAVE_STRFTIME)
757 currentTime = time(NULL);
758 tstruct = localtime(¤tTime);
759 strftime(buf, sizeof(buf) - 1, "%I:%M:%S %p", tstruct);
760 fprintf(fp," %s\n\n", buf);
764 fprintf(fp," MEMORY ALLOCATED : %lu, MAX was %lu\n",
765 debugMemSize, debugMaxMemSize);
766 fprintf(fp,"BLOCK NUMBER SIZE TYPE\n");
768 xmlMutexLock(xmlMemMutex);
771 fprintf(fp,"%-5u %6lu %6lu ",idx++,p->mh_number,
772 (unsigned long)p->mh_size);
773 switch (p->mh_type) {
774 case STRDUP_TYPE:fprintf(fp,"strdup() in ");break;
775 case MALLOC_TYPE:fprintf(fp,"malloc() in ");break;
776 case REALLOC_TYPE:fprintf(fp,"realloc() in ");break;
777 case MALLOC_ATOMIC_TYPE:fprintf(fp,"atomicmalloc() in ");break;
778 case REALLOC_ATOMIC_TYPE:fprintf(fp,"atomicrealloc() in ");break;
780 fprintf(fp,"Unknown memory block, may be corrupted");
781 xmlMutexUnlock(xmlMemMutex);
786 if (p->mh_file != NULL) fprintf(fp,"%s(%u)", p->mh_file, p->mh_line);
787 if (p->mh_tag != MEMTAG)
788 fprintf(fp," INVALID");
791 xmlMemContentShow(fp, p);
798 xmlMutexUnlock(xmlMemMutex);
800 fprintf(fp,"Memory list not compiled (MEM_LIST not defined !)\n");
808 static void debugmem_list_add(MEMHDR *p)
810 p->mh_next = memlist;
812 if (memlist) memlist->mh_prev = p;
814 #ifdef MEM_LIST_DEBUG
820 static void debugmem_list_delete(MEMHDR *p)
823 p->mh_next->mh_prev = p->mh_prev;
825 p->mh_prev->mh_next = p->mh_next;
826 else memlist = p->mh_next;
827 #ifdef MEM_LIST_DEBUG
836 * debugmem_tag_error:
838 * internal error function.
841 static void debugmem_tag_error(void *p)
843 xmlGenericError(xmlGenericErrorContext,
844 "Memory tag error occurs :%p \n\t bye\n", p);
847 xmlMemDisplay(stderr);
852 static FILE *xmlMemoryDumpFile = NULL;
857 * @fp: a FILE descriptor used as the output file
858 * @nr: number of entries to dump
860 * show a show display of the memory allocated, and dump
861 * the @nr last allocated areas which were not freed
865 xmlMemShow(FILE *fp, int nr ATTRIBUTE_UNUSED)
872 fprintf(fp," MEMORY ALLOCATED : %lu, MAX was %lu\n",
873 debugMemSize, debugMaxMemSize);
875 xmlMutexLock(xmlMemMutex);
877 fprintf(fp,"NUMBER SIZE TYPE WHERE\n");
879 while ((p) && nr > 0) {
880 fprintf(fp,"%6lu %6lu ",p->mh_number,(unsigned long)p->mh_size);
881 switch (p->mh_type) {
882 case STRDUP_TYPE:fprintf(fp,"strdup() in ");break;
883 case MALLOC_TYPE:fprintf(fp,"malloc() in ");break;
884 case MALLOC_ATOMIC_TYPE:fprintf(fp,"atomicmalloc() in ");break;
885 case REALLOC_TYPE:fprintf(fp,"realloc() in ");break;
886 case REALLOC_ATOMIC_TYPE:fprintf(fp,"atomicrealloc() in ");break;
887 default:fprintf(fp," ??? in ");break;
889 if (p->mh_file != NULL)
890 fprintf(fp,"%s(%u)", p->mh_file, p->mh_line);
891 if (p->mh_tag != MEMTAG)
892 fprintf(fp," INVALID");
893 xmlMemContentShow(fp, p);
899 xmlMutexUnlock(xmlMemMutex);
900 #endif /* MEM_LIST */
906 * Dump in-extenso the memory blocks allocated to the file .memorylist
915 if (debugMaxMemSize == 0)
917 dump = fopen(".memdump", "w");
919 xmlMemoryDumpFile = stderr;
920 else xmlMemoryDumpFile = dump;
922 xmlMemDisplay(xmlMemoryDumpFile);
924 if (dump != NULL) fclose(dump);
925 #endif /* MEM_LIST */
929 /****************************************************************
931 * Initialization Routines *
933 ****************************************************************/
938 * Initialize the memory layer.
940 * Returns 0 on success
949 xmlGenericError(xmlGenericErrorContext,
950 "xmlInitMemory()\n");
953 This is really not good code (see Bug 130419). Suggestions for
954 improvement will be welcome!
956 if (xmlMemInitialized) return(-1);
957 xmlMemInitialized = 1;
958 xmlMemMutex = xmlNewMutex();
961 breakpoint = getenv("XML_MEM_BREAKPOINT");
962 if (breakpoint != NULL) {
963 sscanf(breakpoint, "%ud", &xmlMemStopAtBlock);
967 breakpoint = getenv("XML_MEM_TRACE");
968 if (breakpoint != NULL) {
969 sscanf(breakpoint, "%p", &xmlMemTraceBlockAt);
974 xmlGenericError(xmlGenericErrorContext,
975 "xmlInitMemory() Ok\n");
983 * Free up all the memory allocated by the library for its own
984 * use. This should not be called by user level code.
987 xmlCleanupMemory(void) {
989 xmlGenericError(xmlGenericErrorContext,
990 "xmlCleanupMemory()\n");
992 if (xmlMemInitialized == 0)
995 xmlFreeMutex(xmlMemMutex);
997 xmlMemInitialized = 0;
999 xmlGenericError(xmlGenericErrorContext,
1000 "xmlCleanupMemory() Ok\n");
1006 * @freeFunc: the free() function to use
1007 * @mallocFunc: the malloc() function to use
1008 * @reallocFunc: the realloc() function to use
1009 * @strdupFunc: the strdup() function to use
1011 * Override the default memory access functions with a new set
1012 * This has to be called before any other libxml routines !
1014 * Should this be blocked if there was already some allocations
1017 * Returns 0 on success
1020 xmlMemSetup(xmlFreeFunc freeFunc, xmlMallocFunc mallocFunc,
1021 xmlReallocFunc reallocFunc, xmlStrdupFunc strdupFunc) {
1023 xmlGenericError(xmlGenericErrorContext,
1026 if (freeFunc == NULL)
1028 if (mallocFunc == NULL)
1030 if (reallocFunc == NULL)
1032 if (strdupFunc == NULL)
1035 xmlMalloc = mallocFunc;
1036 xmlMallocAtomic = mallocFunc;
1037 xmlRealloc = reallocFunc;
1038 xmlMemStrdup = strdupFunc;
1040 xmlGenericError(xmlGenericErrorContext,
1041 "xmlMemSetup() Ok\n");
1048 * @freeFunc: place to save the free() function in use
1049 * @mallocFunc: place to save the malloc() function in use
1050 * @reallocFunc: place to save the realloc() function in use
1051 * @strdupFunc: place to save the strdup() function in use
1053 * Provides the memory access functions set currently in use
1055 * Returns 0 on success
1058 xmlMemGet(xmlFreeFunc *freeFunc, xmlMallocFunc *mallocFunc,
1059 xmlReallocFunc *reallocFunc, xmlStrdupFunc *strdupFunc) {
1060 if (freeFunc != NULL) *freeFunc = xmlFree;
1061 if (mallocFunc != NULL) *mallocFunc = xmlMalloc;
1062 if (reallocFunc != NULL) *reallocFunc = xmlRealloc;
1063 if (strdupFunc != NULL) *strdupFunc = xmlMemStrdup;
1069 * @freeFunc: the free() function to use
1070 * @mallocFunc: the malloc() function to use
1071 * @mallocAtomicFunc: the malloc() function to use for atomic allocations
1072 * @reallocFunc: the realloc() function to use
1073 * @strdupFunc: the strdup() function to use
1075 * Override the default memory access functions with a new set
1076 * This has to be called before any other libxml routines !
1077 * The mallocAtomicFunc is specialized for atomic block
1078 * allocations (i.e. of areas useful for garbage collected memory allocators
1080 * Should this be blocked if there was already some allocations
1083 * Returns 0 on success
1086 xmlGcMemSetup(xmlFreeFunc freeFunc, xmlMallocFunc mallocFunc,
1087 xmlMallocFunc mallocAtomicFunc, xmlReallocFunc reallocFunc,
1088 xmlStrdupFunc strdupFunc) {
1090 xmlGenericError(xmlGenericErrorContext,
1091 "xmlGcMemSetup()\n");
1093 if (freeFunc == NULL)
1095 if (mallocFunc == NULL)
1097 if (mallocAtomicFunc == NULL)
1099 if (reallocFunc == NULL)
1101 if (strdupFunc == NULL)
1104 xmlMalloc = mallocFunc;
1105 xmlMallocAtomic = mallocAtomicFunc;
1106 xmlRealloc = reallocFunc;
1107 xmlMemStrdup = strdupFunc;
1109 xmlGenericError(xmlGenericErrorContext,
1110 "xmlGcMemSetup() Ok\n");
1117 * @freeFunc: place to save the free() function in use
1118 * @mallocFunc: place to save the malloc() function in use
1119 * @mallocAtomicFunc: place to save the atomic malloc() function in use
1120 * @reallocFunc: place to save the realloc() function in use
1121 * @strdupFunc: place to save the strdup() function in use
1123 * Provides the memory access functions set currently in use
1124 * The mallocAtomicFunc is specialized for atomic block
1125 * allocations (i.e. of areas useful for garbage collected memory allocators
1127 * Returns 0 on success
1130 xmlGcMemGet(xmlFreeFunc *freeFunc, xmlMallocFunc *mallocFunc,
1131 xmlMallocFunc *mallocAtomicFunc, xmlReallocFunc *reallocFunc,
1132 xmlStrdupFunc *strdupFunc) {
1133 if (freeFunc != NULL) *freeFunc = xmlFree;
1134 if (mallocFunc != NULL) *mallocFunc = xmlMalloc;
1135 if (mallocAtomicFunc != NULL) *mallocAtomicFunc = xmlMallocAtomic;
1136 if (reallocFunc != NULL) *reallocFunc = xmlRealloc;
1137 if (strdupFunc != NULL) *strdupFunc = xmlMemStrdup;
1141 #define bottom_xmlmemory
1142 #include "elfgcchack.h"