109 lines
3.5 KiB
C
109 lines
3.5 KiB
C
|
|
/* Lowest-level memory allocation interface */
|
|
|
|
#ifndef Py_PYMEM_H
|
|
#define Py_PYMEM_H
|
|
|
|
#include "pyport.h"
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* BEWARE:
|
|
|
|
Each interface exports both functions and macros. Extension modules
|
|
should normally use the functions for ensuring binary compatibility
|
|
of the user's code across Python versions. Subsequently, if the
|
|
Python runtime switches to its own malloc (different from standard
|
|
malloc), no recompilation is required for the extensions.
|
|
|
|
The macro versions are free to trade compatibility for speed, although
|
|
there's no guarantee they're ever faster. Extensions shouldn't use the
|
|
macro versions, as they don't gurantee binary compatibility across
|
|
releases.
|
|
|
|
Do not mix calls to PyMem_xyz with calls to platform
|
|
malloc/realloc/calloc/free. */
|
|
|
|
/*
|
|
* Raw memory interface
|
|
* ====================
|
|
*/
|
|
|
|
/* Functions */
|
|
|
|
/* Functions supplying platform-independent semantics for malloc/realloc/
|
|
free; useful if you need to be sure you're using the same memory
|
|
allocator as Python (this can be especially important on Windows, if
|
|
you need to make sure you're using the same MS malloc/free, and out of
|
|
the same heap, as the main Python DLL uses).
|
|
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).` */
|
|
|
|
extern DL_IMPORT(void *) PyMem_Malloc(size_t);
|
|
extern DL_IMPORT(void *) PyMem_Realloc(void *, size_t);
|
|
extern DL_IMPORT(void) PyMem_Free(void *);
|
|
|
|
/* Starting from Python 1.6, the wrappers Py_{Malloc,Realloc,Free} are
|
|
no longer supported. They used to call PyErr_NoMemory() on failure. */
|
|
|
|
/* Macros. */
|
|
#ifdef PYMALLOC_DEBUG
|
|
/* Redirect all memory operations to Python's debugging allocator. */
|
|
#define PyMem_MALLOC PyObject_MALLOC
|
|
#define PyMem_REALLOC PyObject_REALLOC
|
|
#define PyMem_FREE PyObject_FREE
|
|
|
|
#else /* ! PYMALLOC_DEBUG */
|
|
|
|
#ifdef MALLOC_ZERO_RETURNS_NULL
|
|
#define PyMem_MALLOC(n) malloc((n) ? (n) : 1)
|
|
#else
|
|
#define PyMem_MALLOC malloc
|
|
#endif
|
|
/* Caution: whether MALLOC_ZERO_RETURNS_NULL is #defined has nothing to
|
|
do with whether platform realloc(non-NULL, 0) normally frees the memory
|
|
or returns NULL. Rather than introduce yet another config variation,
|
|
just make a realloc to 0 bytes act as if to 1 instead. */
|
|
#define PyMem_REALLOC(p, n) realloc((p), (n) ? (n) : 1)
|
|
|
|
#define PyMem_FREE free
|
|
#endif /* PYMALLOC_DEBUG */
|
|
|
|
/*
|
|
* Type-oriented memory interface
|
|
* ==============================
|
|
*
|
|
* These are carried along for historical reasons. There's rarely a good
|
|
* reason to use them anymore.
|
|
*/
|
|
|
|
/* Functions */
|
|
#define PyMem_New(type, n) \
|
|
( (type *) PyMem_Malloc((n) * sizeof(type)) )
|
|
#define PyMem_Resize(p, type, n) \
|
|
( (p) = (type *) PyMem_Realloc((p), (n) * sizeof(type)) )
|
|
|
|
/* In order to avoid breaking old code mixing PyObject_{New, NEW} with
|
|
PyMem_{Del, DEL} (there was no choice about this in 1.5.2), the latter
|
|
have to be redirected to the object allocator. */
|
|
#define PyMem_Del PyObject_Free
|
|
|
|
/* Macros */
|
|
#define PyMem_NEW(type, n) \
|
|
( (type *) PyMem_MALLOC((n) * sizeof(type)) )
|
|
#define PyMem_RESIZE(p, type, n) \
|
|
( (p) = (type *) PyMem_REALLOC((p), (n) * sizeof(type)) )
|
|
|
|
#define PyMem_DEL PyObject_FREE
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* !Py_PYMEM_H */
|