Revert changeset 6661a8154eb3: Issue #3329: Add new APIs to customize memory allocators
The new API require more discussion.
diff --git a/Include/pymem.h b/Include/pymem.h
index 34d9318..10b5bea 100644
--- a/Include/pymem.h
+++ b/Include/pymem.h
@@ -11,40 +11,6 @@
extern "C" {
#endif
-typedef struct {
- /* user context passed as the first argument to the 3 functions */
- void *ctx;
-
- /* allocate memory */
- void* (*malloc) (void *ctx, size_t size);
-
- /* allocate memory or resize a memory buffer */
- void* (*realloc) (void *ctx, void *ptr, size_t new_size);
-
- /* release memory */
- void (*free) (void *ctx, void *ptr);
-} PyMemAllocators;
-
-/* Raw memory allocators, system functions: malloc(), realloc(), free().
-
- These functions are thread-safe, the GIL does not need to be held. */
-
-/* Get internal functions of PyMem_RawMalloc(), PyMem_RawRealloc() and
- PyMem_RawFree(). *ctx_p is an arbitrary user value. */
-PyAPI_FUNC(void) PyMem_GetRawAllocators(PyMemAllocators *allocators);
-
-/* Set internal functions of PyMem_RawMalloc(), PyMem_RawRealloc() and
- PyMem_RawFree(). ctx is an arbitrary user value.
-
- PyMem_SetupDebugHooks() should be called to reinstall debug hooks if new
- functions do no call original functions anymore. */
-PyAPI_FUNC(void) PyMem_SetRawAllocators(PyMemAllocators *allocators);
-
-PyAPI_FUNC(void *) PyMem_RawMalloc(size_t size);
-PyAPI_FUNC(void *) PyMem_RawRealloc(void *ptr, size_t new_size);
-PyAPI_FUNC(void) PyMem_RawFree(void *ptr);
-
-
/* BEWARE:
Each interface exports both functions and macros. Extension modules should
@@ -83,11 +49,21 @@
performed on failure (no exception is set, no warning is printed, etc).
*/
-PyAPI_FUNC(void *) PyMem_Malloc(size_t size);
-PyAPI_FUNC(void *) PyMem_Realloc(void *ptr, size_t new_size);
-PyAPI_FUNC(void) PyMem_Free(void *ptr);
+PyAPI_FUNC(void *) PyMem_Malloc(size_t);
+PyAPI_FUNC(void *) PyMem_Realloc(void *, size_t);
+PyAPI_FUNC(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 _PyMem_DebugMalloc
+#define PyMem_REALLOC _PyMem_DebugRealloc
+#define PyMem_FREE _PyMem_DebugFree
+
+#else /* ! PYMALLOC_DEBUG */
/* PyMem_MALLOC(0) means malloc(1). Some systems would return NULL
for malloc(0), which would be treated as an error. Some platforms
@@ -95,9 +71,13 @@
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)
+#define PyMem_MALLOC(n) ((size_t)(n) > (size_t)PY_SSIZE_T_MAX ? NULL \
+ : malloc((n) ? (n) : 1))
+#define PyMem_REALLOC(p, n) ((size_t)(n) > (size_t)PY_SSIZE_T_MAX ? NULL \
+ : realloc((p), (n) ? (n) : 1))
+#define PyMem_FREE free
+
+#endif /* PYMALLOC_DEBUG */
/*
* Type-oriented memory interface
@@ -135,37 +115,6 @@
#define PyMem_Del PyMem_Free
#define PyMem_DEL PyMem_FREE
-/* Get internal functions of PyMem_Malloc(), PyMem_Realloc()
- and PyMem_Free() */
-PyAPI_FUNC(void) PyMem_GetAllocators(PyMemAllocators *allocators);
-
-/* Set internal functions of PyMem_Malloc(), PyMem_Realloc() and PyMem_Free().
-
- malloc(ctx, 0) and realloc(ctx, ptr, 0) must not return NULL: it would be
- treated as an error.
-
- PyMem_SetupDebugHooks() should be called to reinstall debug hooks if new
- functions do no call original functions anymore. */
-PyAPI_FUNC(void) PyMem_SetAllocators(PyMemAllocators *allocators);
-
-/* 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. Additionnal 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);
-
#ifdef __cplusplus
}
#endif