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libxml2 Reference Manual |
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xmlmemory
xmlmemory - interface for the memory allocator
provides interfaces for the memory allocator, including debugging capabilities.
Author(s): Daniel Veillard
Synopsis
#define xmlRealloc; #define xmlMalloc; #define xmlMallocAtomic; #define DEBUG_MEMORY; #define xmlMemStrdup; void * xmlMemRealloc (void * ptr,
size_t size); int xmlInitMemory (void); void xmlMemFree (void * ptr); void * xmlMemMalloc (size_t size); void xmlMemDisplayLast (FILE * fp,
long nbBytes); int xmlMemGet (xmlFreeFunc * freeFunc,
xmlMallocFunc * mallocFunc,
xmlReallocFunc * reallocFunc,
xmlStrdupFunc * strdupFunc); void xmlMemoryDump (void); void * xmlMallocLoc (size_t size,
const char * file,
int line); void xmlMemDisplay (FILE * fp); int xmlMemBlocks (void); int xmlGcMemGet (xmlFreeFunc * freeFunc,
xmlMallocFunc * mallocFunc,
xmlMallocFunc * mallocAtomicFunc,
xmlReallocFunc * reallocFunc,
xmlStrdupFunc * strdupFunc); typedef char * xmlStrdupFunc (const char * str); typedef void xmlFreeFunc (void * mem); void xmlMemShow (FILE * fp,
int nr); void * xmlMallocAtomicLoc (size_t size,
const char * file,
int line); void * xmlReallocLoc (void * ptr,
size_t size,
const char * file,
int line); void xmlCleanupMemory (void); int xmlMemUsed (void); int xmlMemSetup (xmlFreeFunc freeFunc,
xmlMallocFunc mallocFunc,
xmlReallocFunc reallocFunc,
xmlStrdupFunc strdupFunc); typedef void * xmlReallocFunc (void * mem,
size_t size); typedef void * xmlMallocFunc (size_t size); int xmlGcMemSetup (xmlFreeFunc freeFunc,
xmlMallocFunc mallocFunc,
xmlMallocFunc mallocAtomicFunc,
xmlReallocFunc reallocFunc,
xmlStrdupFunc strdupFunc); char * xmlMemoryStrdup (const char * str); char * xmlMemStrdupLoc (const char * str,
const char * file,
int line);
Description
Details
Macro DEBUG_MEMORY
#define DEBUG_MEMORY;
DEBUG_MEMORY replaces the allocator with a collect and debug shell to the libc allocator. DEBUG_MEMORY should only be activated when debugging libxml i.e. if libxml has been configured with --with-debug-mem too. #define DEBUG_MEMORY_FREED #define DEBUG_MEMORY_LOCATION
Function type xmlFreeFunc
void xmlFreeFunc (void * mem)
Signature for a free() implementation.
| mem: | an already allocated block of memory |
Function type xmlMallocFunc
void * xmlMallocFunc (size_t size)
Signature for a malloc() implementation.
| size: | the size requested in bytes |
| Returns: | a pointer to the newly allocated block or NULL in case of error. |
Function type xmlReallocFunc
void * xmlReallocFunc (void * mem,
size_t size)
Signature for a realloc() implementation.
| mem: | an already allocated block of memory |
| size: | the new size requested in bytes |
| Returns: | a pointer to the newly reallocated block or NULL in case of error. |
Function type xmlStrdupFunc
char * xmlStrdupFunc (const char * str)
Signature for an strdup() implementation.
| str: | a zero terminated string |
| Returns: | the copy of the string or NULL in case of error. |
xmlCleanupMemory ()
void xmlCleanupMemory (void)
Free up all the memory allocated by the library for its own use. This should not be called by user level code.
xmlGcMemGet ()
int xmlGcMemGet (xmlFreeFunc * freeFunc,
xmlMallocFunc * mallocFunc,
xmlMallocFunc * mallocAtomicFunc,
xmlReallocFunc * reallocFunc,
xmlStrdupFunc * strdupFunc)
Provides the memory access functions set currently in use The mallocAtomicFunc is specialized for atomic block allocations (i.e. of areas useful for garbage collected memory allocators
| freeFunc: | place to save the free() function in use |
| mallocFunc: | place to save the malloc() function in use |
| mallocAtomicFunc: | place to save the atomic malloc() function in use |
| reallocFunc: | place to save the realloc() function in use |
| strdupFunc: | place to save the strdup() function in use |
| Returns: | 0 on success |
xmlGcMemSetup ()
int xmlGcMemSetup (xmlFreeFunc freeFunc,
xmlMallocFunc mallocFunc,
xmlMallocFunc mallocAtomicFunc,
xmlReallocFunc reallocFunc,
xmlStrdupFunc strdupFunc)
Override the default memory access functions with a new set This has to be called before any other libxml routines ! The mallocAtomicFunc is specialized for atomic block allocations (i.e. of areas useful for garbage collected memory allocators Should this be blocked if there was already some allocations done ?
| freeFunc: | the free() function to use |
| mallocFunc: | the malloc() function to use |
| mallocAtomicFunc: | the malloc() function to use for atomic allocations |
| reallocFunc: | the realloc() function to use |
| strdupFunc: | the strdup() function to use |
| Returns: | 0 on success |
xmlMallocAtomicLoc ()
void * xmlMallocAtomicLoc (size_t size,
const char * file,
int line)
a malloc() equivalent, with logging of the allocation info.
| size: | an unsigned int specifying the size in byte to allocate. |
| file: | the file name or NULL |
| line: | the line number |
| Returns: | a pointer to the allocated area or NULL in case of lack of memory. |
xmlMallocLoc ()
void * xmlMallocLoc (size_t size,
const char * file,
int line)
a malloc() equivalent, with logging of the allocation info.
| size: | an int specifying the size in byte to allocate. |
| file: | the file name or NULL |
| line: | the line number |
| Returns: | a pointer to the allocated area or NULL in case of lack of memory. |
xmlMemBlocks ()
int xmlMemBlocks (void)
Provides the number of memory areas currently allocated
| Returns: | an int representing the number of blocks |
xmlMemDisplay ()
void xmlMemDisplay (FILE * fp)
show in-extenso the memory blocks allocated
| fp: | a FILE descriptor used as the output file, if NULL, the result is written to the file .memorylist |
xmlMemDisplayLast ()
void xmlMemDisplayLast (FILE * fp,
long nbBytes)
the last nbBytes of memory allocated and not freed, useful for dumping the memory left allocated between two places at runtime.
| fp: | a FILE descriptor used as the output file, if NULL, the result is written to the file .memorylist |
| nbBytes: | the amount of memory to dump |
xmlMemFree ()
void xmlMemFree (void * ptr)
a free() equivalent, with error checking.
| ptr: | the memory block pointer |
xmlMemGet ()
int xmlMemGet (xmlFreeFunc * freeFunc,
xmlMallocFunc * mallocFunc,
xmlReallocFunc * reallocFunc,
xmlStrdupFunc * strdupFunc)
Provides the memory access functions set currently in use
| freeFunc: | place to save the free() function in use |
| mallocFunc: | place to save the malloc() function in use |
| reallocFunc: | place to save the realloc() function in use |
| strdupFunc: | place to save the strdup() function in use |
| Returns: | 0 on success |
xmlMemMalloc ()
void * xmlMemMalloc (size_t size)
a malloc() equivalent, with logging of the allocation info.
| size: | an int specifying the size in byte to allocate. |
| Returns: | a pointer to the allocated area or NULL in case of lack of memory. |
xmlMemRealloc ()
void * xmlMemRealloc (void * ptr,
size_t size)
a realloc() equivalent, with logging of the allocation info.
| ptr: | the initial memory block pointer |
| size: | an int specifying the size in byte to allocate. |
| Returns: | a pointer to the allocated area or NULL in case of lack of memory. |
xmlMemSetup ()
int xmlMemSetup (xmlFreeFunc freeFunc,
xmlMallocFunc mallocFunc,
xmlReallocFunc reallocFunc,
xmlStrdupFunc strdupFunc)
Override the default memory access functions with a new set This has to be called before any other libxml routines ! Should this be blocked if there was already some allocations done ?
| freeFunc: | the free() function to use |
| mallocFunc: | the malloc() function to use |
| reallocFunc: | the realloc() function to use |
| strdupFunc: | the strdup() function to use |
| Returns: | 0 on success |
xmlMemShow ()
void xmlMemShow (FILE * fp,
int nr)
show a show display of the memory allocated, and dump the @nr last allocated areas which were not freed
| fp: | a FILE descriptor used as the output file |
| nr: | number of entries to dump |
xmlMemStrdupLoc ()
char * xmlMemStrdupLoc (const char * str,
const char * file,
int line)
a strdup() equivalent, with logging of the allocation info.
| str: | the initial string pointer |
| file: | the file name or NULL |
| line: | the line number |
| Returns: | a pointer to the new string or NULL if allocation error occurred. |
xmlMemUsed ()
int xmlMemUsed (void)
Provides the amount of memory currently allocated
| Returns: | an int representing the amount of memory allocated. |
xmlMemoryDump ()
void xmlMemoryDump (void)
Dump in-extenso the memory blocks allocated to the file .memorylist
xmlMemoryStrdup ()
char * xmlMemoryStrdup (const char * str)
a strdup() equivalent, with logging of the allocation info.
| str: | the initial string pointer |
| Returns: | a pointer to the new string or NULL if allocation error occurred. |
xmlReallocLoc ()
void * xmlReallocLoc (void * ptr,
size_t size,
const char * file,
int line)
a realloc() equivalent, with logging of the allocation info.
| ptr: | the initial memory block pointer |
| size: | an int specifying the size in byte to allocate. |
| file: | the file name or NULL |
| line: | the line number |
| Returns: | a pointer to the allocated area or NULL in case of lack of memory. |