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cpython/Include/internal/pycore_pymem.h at master · python-emscripten/cpython · GitHub
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pycore_pymem.h
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#ifndef
Py_INTERNAL_PYMEM_H
#define
Py_INTERNAL_PYMEM_H
#ifdef
__cplusplus
extern
"C"
{
#endif
#ifndef
Py_BUILD_CORE
# error
"this header requires Py_BUILD_CORE define"
#endif
#include
"pymem.h"
// PyMemAllocatorName
/* 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
);
/* Special bytes broadcast into debug memory blocks at appropriate times.
Strings of these are unlikely to be valid addresses, floats, ints or
7-bit ASCII.
- PYMEM_CLEANBYTE: clean (newly allocated) memory
- PYMEM_DEADBYTE dead (newly freed) memory
- PYMEM_FORBIDDENBYTE: untouchable bytes at each end of a block
Byte patterns 0xCB, 0xDB and 0xFB have been replaced with 0xCD, 0xDD and
0xFD to use the same values than Windows CRT debug malloc() and free().
If modified, _PyMem_IsPtrFreed() should be updated as well. */
#define
PYMEM_CLEANBYTE
0xCD
#define
PYMEM_DEADBYTE
0xDD
#define
PYMEM_FORBIDDENBYTE
0xFD
/* Heuristic checking if a pointer value is newly allocated
(uninitialized), newly freed or NULL (is equal to zero).
The pointer is not dereferenced, only the pointer value is checked.
The heuristic relies on the debug hooks on Python memory allocators which
fills newly allocated memory with CLEANBYTE (0xCD) and newly freed memory
with DEADBYTE (0xDD). Detect also "untouchable bytes" marked
with FORBIDDENBYTE (0xFD). */
static
inline
int
_PyMem_IsPtrFreed
(
void
*
ptr
)
{
uintptr_t
value
=
(
uintptr_t
)
ptr
;
#if
SIZEOF_VOID_P
==
8
return
(
value
==
0
||
value
==
(
uintptr_t
)
0xCDCDCDCDCDCDCDCD
||
value
==
(
uintptr_t
)
0xDDDDDDDDDDDDDDDD
||
value
==
(
uintptr_t
)
0xFDFDFDFDFDFDFDFD
);
#elif
SIZEOF_VOID_P
==
4
return
(
value
==
0
||
value
==
(
uintptr_t
)
0xCDCDCDCD
||
value
==
(
uintptr_t
)
0xDDDDDDDD
||
value
==
(
uintptr_t
)
0xFDFDFDFD
);
#else
# error
"unknown pointer size"
#endif
}
PyAPI_FUNC
(
int
)
_PyMem_GetAllocatorName
(
const
char
*
name
,
PyMemAllocatorName
*
allocator
);
/* Configure the Python memory allocators.
Pass PYMEM_ALLOCATOR_DEFAULT to use default allocators.
PYMEM_ALLOCATOR_NOT_SET does nothing. */
PyAPI_FUNC
(
int
)
_PyMem_SetupAllocators
(
PyMemAllocatorName
allocator
);
/* bpo-35053: Expose _Py_tracemalloc_config for _Py_NewReference()
which access directly _Py_tracemalloc_config.tracing for best
performances. */
struct
_PyTraceMalloc_Config
{
/* Module initialized?
Variable protected by the GIL */
enum
{
TRACEMALLOC_NOT_INITIALIZED
,
TRACEMALLOC_INITIALIZED
,
TRACEMALLOC_FINALIZED
}
initialized
;
/* Is tracemalloc tracing memory allocations?
Variable protected by the GIL */
int
tracing
;
/* limit of the number of frames in a traceback, 1 by default.
Variable protected by the GIL. */
int
max_nframe
;
};
#define
_PyTraceMalloc_Config_INIT
\
{.initialized = TRACEMALLOC_NOT_INITIALIZED, \
.tracing = 0, \
.max_nframe = 1}
PyAPI_DATA
(
struct
_PyTraceMalloc_Config
)
_Py_tracemalloc_config
;
#ifdef
__cplusplus
}
#endif
#endif
/* !Py_INTERNAL_PYMEM_H */
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