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- /* The PyMem_ family: low-level memory allocation interfaces.
- See objimpl.h for the PyObject_ memory family.
- */
- #ifndef Py_PYMEM_H
- #define Py_PYMEM_H
- #include "pyport.h"
- #ifdef __cplusplus
- extern "C" {
- #endif
- #ifndef Py_LIMITED_API
- PyAPI_FUNC(void *) PyMem_RawMalloc(size_t size);
- PyAPI_FUNC(void *) PyMem_RawCalloc(size_t nelem, size_t elsize);
- PyAPI_FUNC(void *) PyMem_RawRealloc(void *ptr, size_t new_size);
- PyAPI_FUNC(void) PyMem_RawFree(void *ptr);
- /* Configure the Python memory allocators. Pass NULL to use default
- allocators. */
- PyAPI_FUNC(int) _PyMem_SetupAllocators(const char *opt);
- /* Try to get the allocators name set by _PyMem_SetupAllocators(). */
- PyAPI_FUNC(const char*) _PyMem_GetAllocatorsName(void);
- /* Track an allocated memory block in the tracemalloc module.
- Return 0 on success, return -1 on error (failed to allocate memory to store
- the trace).
- Return -2 if tracemalloc is disabled.
- If memory block is already tracked, update the existing trace. */
- PyAPI_FUNC(int) PyTraceMalloc_Track(
- unsigned int domain,
- uintptr_t ptr,
- size_t size);
- /* Untrack an allocated memory block in the tracemalloc module.
- Do nothing if the block was not tracked.
- Return -2 if tracemalloc is disabled, otherwise return 0. */
- PyAPI_FUNC(int) PyTraceMalloc_Untrack(
- unsigned int domain,
- uintptr_t ptr);
- /* Get the traceback where a memory block was allocated.
- Return a tuple of (filename: str, lineno: int) tuples.
- Return None if the tracemalloc module is disabled or if the memory block
- is not tracked by tracemalloc.
- Raise an exception and return NULL on error. */
- PyAPI_FUNC(PyObject*) _PyTraceMalloc_GetTraceback(
- unsigned int domain,
- uintptr_t ptr);
- PyAPI_FUNC(int) _PyMem_IsFreed(void *ptr, size_t size);
- #endif /* !defined(Py_LIMITED_API) */
- /* BEWARE:
- Each interface exports both functions and macros. Extension modules should
- use the functions, to ensure binary compatibility across Python versions.
- Because the Python implementation is free to change internal details, and
- the macros may (or may not) expose details for speed, if you do use the
- macros you must recompile your extensions with each Python release.
- Never mix calls to PyMem_ with calls to the platform malloc/realloc/
- calloc/free. For example, on Windows different DLLs may end up using
- different heaps, and if you use PyMem_Malloc you'll get the memory from the
- heap used by the Python DLL; it could be a disaster if you free()'ed that
- directly in your own extension. Using PyMem_Free instead ensures Python
- can return the memory to the proper heap. As another example, in
- PYMALLOC_DEBUG mode, Python wraps all calls to all PyMem_ and PyObject_
- memory functions in special debugging wrappers that add additional
- debugging info to dynamic memory blocks. The system routines have no idea
- what to do with that stuff, and the Python wrappers have no idea what to do
- with raw blocks obtained directly by the system routines then.
- The GIL must be held when using these APIs.
- */
- /*
- * Raw memory interface
- * ====================
- */
- /* Functions
- Functions supplying platform-independent semantics for malloc/realloc/
- free. These functions make sure that allocating 0 bytes returns a distinct
- non-NULL pointer (whenever possible -- if we're flat out of memory, NULL
- may be returned), even if the platform malloc and realloc don't.
- Returned pointers must be checked for NULL explicitly. No action is
- performed on failure (no exception is set, no warning is printed, etc).
- */
- PyAPI_FUNC(void *) PyMem_Malloc(size_t size);
- #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03050000
- PyAPI_FUNC(void *) PyMem_Calloc(size_t nelem, size_t elsize);
- #endif
- PyAPI_FUNC(void *) PyMem_Realloc(void *ptr, size_t new_size);
- PyAPI_FUNC(void) PyMem_Free(void *ptr);
- #ifndef Py_LIMITED_API
- /* strdup() using PyMem_RawMalloc() */
- PyAPI_FUNC(char *) _PyMem_RawStrdup(const char *str);
- /* strdup() using PyMem_Malloc() */
- PyAPI_FUNC(char *) _PyMem_Strdup(const char *str);
- /* wcsdup() using PyMem_RawMalloc() */
- PyAPI_FUNC(wchar_t*) _PyMem_RawWcsdup(const wchar_t *str);
- #endif
- /* Macros. */
- /* PyMem_MALLOC(0) means malloc(1). Some systems would return NULL
- for malloc(0), which would be treated as an error. Some platforms
- would return a pointer with no memory behind it, which would break
- pymalloc. To solve these problems, allocate an extra byte. */
- /* Returns NULL to indicate error if a negative size or size larger than
- Py_ssize_t can represent is supplied. Helps prevents security holes. */
- #define PyMem_MALLOC(n) PyMem_Malloc(n)
- #define PyMem_REALLOC(p, n) PyMem_Realloc(p, n)
- #define PyMem_FREE(p) PyMem_Free(p)
- /*
- * Type-oriented memory interface
- * ==============================
- *
- * Allocate memory for n objects of the given type. Returns a new pointer
- * or NULL if the request was too large or memory allocation failed. Use
- * these macros rather than doing the multiplication yourself so that proper
- * overflow checking is always done.
- */
- #define PyMem_New(type, n) \
- ( ((size_t)(n) > PY_SSIZE_T_MAX / sizeof(type)) ? NULL : \
- ( (type *) PyMem_Malloc((n) * sizeof(type)) ) )
- #define PyMem_NEW(type, n) \
- ( ((size_t)(n) > PY_SSIZE_T_MAX / sizeof(type)) ? NULL : \
- ( (type *) PyMem_MALLOC((n) * sizeof(type)) ) )
- /*
- * The value of (p) is always clobbered by this macro regardless of success.
- * The caller MUST check if (p) is NULL afterwards and deal with the memory
- * error if so. This means the original value of (p) MUST be saved for the
- * caller's memory error handler to not lose track of it.
- */
- #define PyMem_Resize(p, type, n) \
- ( (p) = ((size_t)(n) > PY_SSIZE_T_MAX / sizeof(type)) ? NULL : \
- (type *) PyMem_Realloc((p), (n) * sizeof(type)) )
- #define PyMem_RESIZE(p, type, n) \
- ( (p) = ((size_t)(n) > PY_SSIZE_T_MAX / sizeof(type)) ? NULL : \
- (type *) PyMem_REALLOC((p), (n) * sizeof(type)) )
- /* PyMem{Del,DEL} are left over from ancient days, and shouldn't be used
- * anymore. They're just confusing aliases for PyMem_{Free,FREE} now.
- */
- #define PyMem_Del PyMem_Free
- #define PyMem_DEL PyMem_FREE
- #ifndef Py_LIMITED_API
- typedef enum {
- /* PyMem_RawMalloc(), PyMem_RawRealloc() and PyMem_RawFree() */
- PYMEM_DOMAIN_RAW,
- /* PyMem_Malloc(), PyMem_Realloc() and PyMem_Free() */
- PYMEM_DOMAIN_MEM,
- /* PyObject_Malloc(), PyObject_Realloc() and PyObject_Free() */
- PYMEM_DOMAIN_OBJ
- } PyMemAllocatorDomain;
- typedef struct {
- /* user context passed as the first argument to the 4 functions */
- void *ctx;
- /* allocate a memory block */
- void* (*malloc) (void *ctx, size_t size);
- /* allocate a memory block initialized by zeros */
- void* (*calloc) (void *ctx, size_t nelem, size_t elsize);
- /* allocate or resize a memory block */
- void* (*realloc) (void *ctx, void *ptr, size_t new_size);
- /* release a memory block */
- void (*free) (void *ctx, void *ptr);
- } PyMemAllocatorEx;
- /* Get the memory block allocator of the specified domain. */
- PyAPI_FUNC(void) PyMem_GetAllocator(PyMemAllocatorDomain domain,
- PyMemAllocatorEx *allocator);
- /* Set the memory block allocator of the specified domain.
- The new allocator must return a distinct non-NULL pointer when requesting
- zero bytes.
- For the PYMEM_DOMAIN_RAW domain, the allocator must be thread-safe: the GIL
- is not held when the allocator is called.
- If the new allocator is not a hook (don't call the previous allocator), the
- PyMem_SetupDebugHooks() function must be called to reinstall the debug hooks
- on top on the new allocator. */
- PyAPI_FUNC(void) PyMem_SetAllocator(PyMemAllocatorDomain domain,
- PyMemAllocatorEx *allocator);
- /* Setup hooks to detect bugs in the following Python memory allocator
- functions:
- - PyMem_RawMalloc(), PyMem_RawRealloc(), PyMem_RawFree()
- - PyMem_Malloc(), PyMem_Realloc(), PyMem_Free()
- - PyObject_Malloc(), PyObject_Realloc() and PyObject_Free()
- Newly allocated memory is filled with the byte 0xCB, freed memory is filled
- with the byte 0xDB. Additional checks:
- - detect API violations, ex: PyObject_Free() called on a buffer allocated
- by PyMem_Malloc()
- - detect write before the start of the buffer (buffer underflow)
- - detect write after the end of the buffer (buffer overflow)
- The function does nothing if Python is not compiled is debug mode. */
- PyAPI_FUNC(void) PyMem_SetupDebugHooks(void);
- #endif
- #ifdef Py_BUILD_CORE
- /* Set the memory allocator of the specified domain to the default.
- Save the old allocator into *old_alloc if it's non-NULL.
- Return on success, or return -1 if the domain is unknown. */
- PyAPI_FUNC(int) _PyMem_SetDefaultAllocator(
- PyMemAllocatorDomain domain,
- PyMemAllocatorEx *old_alloc);
- #endif
- #ifdef __cplusplus
- }
- #endif
- #endif /* !Py_PYMEM_H */
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