/*********************************************************** Copyright (c) 2000, BeOpen.com. Copyright (c) 1995-2000, Corporation for National Research Initiatives. Copyright (c) 1990-1995, Stichting Mathematisch Centrum. All rights reserved. See the file "Misc/COPYRIGHT" for information on usage and redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. ******************************************************************/ /*************************************** THIS FILE IS OBSOLETE USE "pyport.h" INSTEAD ***************************************/ #ifndef Py_MYMALLOC_H #define Py_MYMALLOC_H /* Lowest-level memory allocation interface */ #define ANY void /* For API compatibility only. Obsolete, do not use. */ #ifdef HAVE_STDLIB_H #include #endif #include "myproto.h" #ifdef __cplusplus /* Move this down here since some C++ #include's don't like to be included inside an extern "C" */ extern "C" { #endif #ifndef DL_IMPORT /* declarations for DLL import */ #define DL_IMPORT(RTYPE) RTYPE #endif #ifndef NULL #define NULL ((void *)0) #endif #ifdef MALLOC_ZERO_RETURNS_NULL /* XXX Always allocate one extra byte, since some malloc's return NULL XXX for malloc(0) or realloc(p, 0). */ #define _PyMem_EXTRA 1 #else #define _PyMem_EXTRA 0 #endif /* * Core memory allocator * ===================== */ /* To make sure the interpreter is user-malloc friendly, all memory APIs are implemented on top of this one. The PyCore_* macros can be defined to make the interpreter use a custom allocator. Note that they are for internal use only. Both the core and extension modules should use the PyMem_* API. See the comment block at the end of this file for two scenarios showing how to use this to use a different allocator. */ #ifndef PyCore_MALLOC_FUNC #undef PyCore_REALLOC_FUNC #undef PyCore_FREE_FUNC #define PyCore_MALLOC_FUNC malloc #define PyCore_REALLOC_FUNC realloc #define PyCore_FREE_FUNC free #endif #ifndef PyCore_MALLOC_PROTO #undef PyCore_REALLOC_PROTO #undef PyCore_FREE_PROTO #define PyCore_MALLOC_PROTO (size_t) #define PyCore_REALLOC_PROTO (void *, size_t) #define PyCore_FREE_PROTO (void *) #endif #ifdef NEED_TO_DECLARE_MALLOC_AND_FRIEND extern void *PyCore_MALLOC_FUNC PyCore_MALLOC_PROTO; extern void *PyCore_REALLOC_FUNC PyCore_REALLOC_PROTO; extern void PyCore_FREE_FUNC PyCore_FREE_PROTO; #endif #ifndef PyCore_MALLOC #undef PyCore_REALLOC #undef PyCore_FREE #define PyCore_MALLOC(n) PyCore_MALLOC_FUNC(n) #define PyCore_REALLOC(p, n) PyCore_REALLOC_FUNC((p), (n)) #define PyCore_FREE(p) PyCore_FREE_FUNC(p) #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 trade compatibility for speed. They can be used whenever there is a performance problem, but their use implies recompilation of the code for each new Python release. The Python core uses the macros because it *is* compiled on every upgrade. This might not be the case with 3rd party extensions in a custom setup (for example, a customer does not always have access to the source of 3rd party deliverables). You have been warned! */ /* * Raw memory interface * ==================== */ /* Functions */ /* Function wrappers around PyCore_MALLOC and friends; useful if you need to be sure that you are using the same memory allocator as Python. Note that the wrappers make sure that allocating 0 bytes returns a non-NULL pointer, even if the underlying malloc doesn't. Returned pointers must be checked for NULL explicitly. No action is performed on failure. */ 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 */ #define PyMem_MALLOC(n) PyCore_MALLOC(n) #define PyMem_REALLOC(p, n) PyCore_REALLOC((void *)(p), (n)) #define PyMem_FREE(p) PyCore_FREE((void *)(p)) /* * Type-oriented memory interface * ============================== */ /* Functions */ #define PyMem_New(type, n) \ ( (type *) PyMem_Malloc((n) * sizeof(type)) ) #define PyMem_Resize(p, type, n) \ ( (p) = (type *) PyMem_Realloc((n) * sizeof(type)) ) #define PyMem_Del(p) PyMem_Free(p) /* Macros */ #define PyMem_NEW(type, n) \ ( (type *) PyMem_MALLOC(_PyMem_EXTRA + (n) * sizeof(type)) ) #define PyMem_RESIZE(p, type, n) \ if ((p) == NULL) \ (p) = (type *)(PyMem_MALLOC( \ _PyMem_EXTRA + (n) * sizeof(type))); \ else \ (p) = (type *)(PyMem_REALLOC((p), \ _PyMem_EXTRA + (n) * sizeof(type))) #define PyMem_DEL(p) PyMem_FREE(p) /* PyMem_XDEL is deprecated. To avoid the call when p is NULL, it is recommended to write the test explicitly in the code. Note that according to ANSI C, free(NULL) has no effect. */ #ifdef __cplusplus } #endif /* SCENARIOS Here are two scenarios by Vladimir Marangozov (the author of the memory allocation redesign). 1) Scenario A Suppose you want to use a debugging malloc library that collects info on where the malloc calls originate from. Assume the interface is: d_malloc(size_t n, char* src_file, unsigned long src_line) c.s. In this case, you would define (for example in config.h) : #define PyCore_MALLOC_FUNC d_malloc ... #define PyCore_MALLOC_PROTO (size_t, char *, unsigned long) ... #define NEED_TO_DECLARE_MALLOC_AND_FRIEND #define PyCore_MALLOC(n) PyCore_MALLOC_FUNC((n), __FILE__, __LINE__) ... 2) Scenario B Suppose you want to use malloc hooks (defined & initialized in a 3rd party malloc library) instead of malloc functions. In this case, you would define: #define PyCore_MALLOC_FUNC (*malloc_hook) ... #define NEED_TO_DECLARE_MALLOC_AND_FRIEND and ignore the previous definitions about PyCore_MALLOC_FUNC, etc. */ #endif /* !Py_MYMALLOC_H */