mirror of https://github.com/python/cpython
127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
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/* Lowest-level memory allocation interface */
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#ifndef Py_PYMEM_H
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#define Py_PYMEM_H
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#include "pyport.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* BEWARE:
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Each interface exports both functions and macros. Extension modules
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should normally use the functions for ensuring binary compatibility
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of the user's code across Python versions. Subsequently, if the
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Python runtime switches to its own malloc (different from standard
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malloc), no recompilation is required for the extensions.
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The macro versions trade compatibility for speed. They can be used
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whenever there is a performance problem, but their use implies
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recompilation of the code for each new Python release. The Python
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core uses the macros because it *is* compiled on every upgrade.
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This might not be the case with 3rd party extensions in a custom
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setup (for example, a customer does not always have access to the
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source of 3rd party deliverables). You have been warned! */
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/*
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* Raw memory interface
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* ====================
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*/
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/* To make sure the interpreter is user-malloc friendly, all memory
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APIs are implemented on top of this one. */
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/* Functions */
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/* Function wrappers around PyMem_MALLOC and friends; useful if you
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need to be sure that you are using the same memory allocator as
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Python. Note that the wrappers make sure that allocating 0 bytes
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returns a non-NULL pointer, even if the underlying malloc
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doesn't. Returned pointers must be checked for NULL explicitly.
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No action is performed on failure. */
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extern DL_IMPORT(void *) PyMem_Malloc(size_t);
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extern DL_IMPORT(void *) PyMem_Realloc(void *, size_t);
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extern DL_IMPORT(void) PyMem_Free(void *);
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/* Starting from Python 1.6, the wrappers Py_{Malloc,Realloc,Free} are
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no longer supported. They used to call PyErr_NoMemory() on failure. */
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/* Macros (override these if you want to a different malloc */
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#ifndef PyMem_MALLOC
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#define PyMem_MALLOC(n) malloc(n)
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#define PyMem_REALLOC(p, n) realloc((void *)(p), (n))
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#define PyMem_FREE(p) free((void *)(p))
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#endif
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/*
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* Type-oriented memory interface
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* ==============================
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*/
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/* Functions */
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#define PyMem_New(type, n) \
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( (type *) PyMem_Malloc((n) * sizeof(type)) )
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#define PyMem_Resize(p, type, n) \
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( (p) = (type *) PyMem_Realloc((p), (n) * sizeof(type)) )
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#define PyMem_Del(p) PyMem_Free(p)
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/* Macros */
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#define PyMem_NEW(type, n) \
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( (type *) PyMem_MALLOC(_PyMem_EXTRA + (n) * sizeof(type)) )
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/* See comment near MALLOC_ZERO_RETURNS_NULL in pyport.h. */
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#define PyMem_RESIZE(p, type, n) \
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do { \
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size_t _sum = (n) * sizeof(type); \
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if (!_sum) \
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_sum = 1; \
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(p) = (type *)((p) ? \
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PyMem_REALLOC(p, _sum) : \
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PyMem_MALLOC(_sum)); \
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} while (0)
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#define PyMem_DEL(p) PyMem_FREE(p)
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/* PyMem_XDEL is deprecated. To avoid the call when p is NULL,
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it is recommended to write the test explicitly in the code.
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Note that according to ANSI C, free(NULL) has no effect. */
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/* pymalloc (private to the interpreter) */
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#ifdef WITH_PYMALLOC
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DL_IMPORT(void *) _PyMalloc_Malloc(size_t nbytes);
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DL_IMPORT(void *) _PyMalloc_Realloc(void *p, size_t nbytes);
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DL_IMPORT(void) _PyMalloc_Free(void *p);
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#ifdef PYMALLOC_DEBUG
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DL_IMPORT(void *) _PyMalloc_DebugMalloc(size_t nbytes);
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DL_IMPORT(void *) _PyMalloc_DebugRealloc(void *p, size_t nbytes);
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DL_IMPORT(void) _PyMalloc_DebugFree(void *p);
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DL_IMPORT(void) _PyMalloc_DebugDumpAddress(const void *p);
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DL_IMPORT(void) _PyMalloc_DebugCheckAddress(const void *p);
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#define _PyMalloc_MALLOC _PyMalloc_DebugMalloc
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#define _PyMalloc_REALLOC _PyMalloc_DebugRealloc
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#define _PyMalloc_FREE _PyMalloc_DebugFree
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#else /* WITH_PYMALLOC && ! PYMALLOC_DEBUG */
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#define _PyMalloc_MALLOC _PyMalloc_Malloc
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#define _PyMalloc_REALLOC _PyMalloc_Realloc
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#define _PyMalloc_FREE _PyMalloc_Free
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#endif
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#else /* ! WITH_PYMALLOC */
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#define _PyMalloc_MALLOC PyMem_MALLOC
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#define _PyMalloc_REALLOC PyMem_REALLOC
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#define _PyMalloc_FREE PyMem_FREE
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#endif /* WITH_PYMALLOC */
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_PYMEM_H */
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