Mercurial > cpython-lru_cache-weakref

annotate Include/pymem.h @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents 887ee6bd9284
children ef74764a6320 b6aff7a59803
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1 /* The PyMem_ family: low-level memory allocation interfaces.
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2 See objimpl.h for the PyObject_ memory family.
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3 */
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4
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5 #ifndef Py_PYMEM_H
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6 #define Py_PYMEM_H
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7
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8 #include "pyport.h"
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9
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10 #ifdef __cplusplus
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11 extern "C" {
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12 #endif
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13
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14 /* BEWARE:
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15
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16 Each interface exports both functions and macros. Extension modules should
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17 use the functions, to ensure binary compatibility across Python versions.
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18 Because the Python implementation is free to change internal details, and
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19 the macros may (or may not) expose details for speed, if you do use the
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20 macros you must recompile your extensions with each Python release.
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21
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22 Never mix calls to PyMem_ with calls to the platform malloc/realloc/
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23 calloc/free. For example, on Windows different DLLs may end up using
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24 different heaps, and if you use PyMem_Malloc you'll get the memory from the
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25 heap used by the Python DLL; it could be a disaster if you free()'ed that
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26 directly in your own extension. Using PyMem_Free instead ensures Python
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27 can return the memory to the proper heap. As another example, in
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28 PYMALLOC_DEBUG mode, Python wraps all calls to all PyMem_ and PyObject_
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29 memory functions in special debugging wrappers that add additional
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30 debugging info to dynamic memory blocks. The system routines have no idea
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31 what to do with that stuff, and the Python wrappers have no idea what to do
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32 with raw blocks obtained directly by the system routines then.
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33
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34 The GIL must be held when using these APIs.
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35 */
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36
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37 /*
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38 * Raw memory interface
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39 * ====================
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40 */
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41
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42 /* Functions
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43
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44 Functions supplying platform-independent semantics for malloc/realloc/
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45 free. These functions make sure that allocating 0 bytes returns a distinct
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46 non-NULL pointer (whenever possible -- if we're flat out of memory, NULL
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47 may be returned), even if the platform malloc and realloc don't.
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48 Returned pointers must be checked for NULL explicitly. No action is
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49 performed on failure (no exception is set, no warning is printed, etc).
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50 */
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51
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52 PyAPI_FUNC(void *) PyMem_Malloc(size_t);
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53 PyAPI_FUNC(void *) PyMem_Realloc(void *, size_t);
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54 PyAPI_FUNC(void) PyMem_Free(void *);
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55
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56 /* Starting from Python 1.6, the wrappers Py_{Malloc,Realloc,Free} are
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57 no longer supported. They used to call PyErr_NoMemory() on failure. */
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58
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59 /* Macros. */
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60 #ifdef PYMALLOC_DEBUG
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61 /* Redirect all memory operations to Python's debugging allocator. */
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62 #define PyMem_MALLOC PyObject_MALLOC
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63 #define PyMem_REALLOC PyObject_REALLOC
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64 #define PyMem_FREE PyObject_FREE
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65
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66 #else /* ! PYMALLOC_DEBUG */
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67
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68 /* PyMem_MALLOC(0) means malloc(1). Some systems would return NULL
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69 for malloc(0), which would be treated as an error. Some platforms
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70 would return a pointer with no memory behind it, which would break
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71 pymalloc. To solve these problems, allocate an extra byte. */
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72 /* Returns NULL to indicate error if a negative size or size larger than
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73 Py_ssize_t can represent is supplied. Helps prevents security holes. */
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74 #define PyMem_MALLOC(n) (((n) < 0 || (n) > PY_SSIZE_T_MAX) ? NULL \
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75 : malloc((n) ? (n) : 1))
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76 #define PyMem_REALLOC(p, n) (((n) < 0 || (n) > PY_SSIZE_T_MAX) ? NULL \
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77 : realloc((p), (n) ? (n) : 1))
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78 #define PyMem_FREE free
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79
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80 #endif /* PYMALLOC_DEBUG */
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81
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82 /*
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83 * Type-oriented memory interface
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84 * ==============================
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85 *
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86 * Allocate memory for n objects of the given type. Returns a new pointer
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87 * or NULL if the request was too large or memory allocation failed. Use
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88 * these macros rather than doing the multiplication yourself so that proper
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89 * overflow checking is always done.
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90 */
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91
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92 #define PyMem_New(type, n) \
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93 ( ((n) > PY_SSIZE_T_MAX / sizeof(type)) ? NULL : \
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94 ( (type *) PyMem_Malloc((n) * sizeof(type)) ) )
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95 #define PyMem_NEW(type, n) \
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96 ( ((n) > PY_SSIZE_T_MAX / sizeof(type)) ? NULL : \
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97 ( (type *) PyMem_MALLOC((n) * sizeof(type)) ) )
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98
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99 /*
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100 * The value of (p) is always clobbered by this macro regardless of success.
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101 * The caller MUST check if (p) is NULL afterwards and deal with the memory
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102 * error if so. This means the original value of (p) MUST be saved for the
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103 * caller's memory error handler to not lose track of it.
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104 */
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105 #define PyMem_Resize(p, type, n) \
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106 ( (p) = ((n) > PY_SSIZE_T_MAX / sizeof(type)) ? NULL : \
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107 (type *) PyMem_Realloc((p), (n) * sizeof(type)) )
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108 #define PyMem_RESIZE(p, type, n) \
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109 ( (p) = ((n) > PY_SSIZE_T_MAX / sizeof(type)) ? NULL : \
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110 (type *) PyMem_REALLOC((p), (n) * sizeof(type)) )
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111
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112 /* PyMem{Del,DEL} are left over from ancient days, and shouldn't be used
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113 * anymore. They're just confusing aliases for PyMem_{Free,FREE} now.
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114 */
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115 #define PyMem_Del PyMem_Free
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116 #define PyMem_DEL PyMem_FREE
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117
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118 #ifdef __cplusplus
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119 }
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120 #endif
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121
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122 #endif /* !Py_PYMEM_H */