Mercurial > cpython-lru_cache-weakref
annotate Include/objimpl.h @ 58765:2ba7677bfa95 legacy-trunk
testCopysign was defined twice in test_math; combine the definitions
| author | Mark Dickinson <dickinsm@gmail.com> |
|---|---|
| date | Sat, 06 Feb 2010 23:11:25 +0000 |
| parents | ab49e0ac8c8f |
| children | fd25030223b0 |
| rev | line source |
|---|---|
| 23297 | 1 /* The PyObject_ memory family: high-level object memory interfaces. |
| 2 See pymem.h for the low-level PyMem_ family. | |
| 3 */ | |
| 145 | 4 |
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5 #ifndef Py_OBJIMPL_H |
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6 #define Py_OBJIMPL_H |
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7 |
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8 #include "pymem.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 |
| 23297 | 14 /* BEWARE: |
| 15 | |
| 16 Each interface exports both functions and macros. Extension modules should | |
| 17 use the functions, to ensure binary compatibility across Python versions. | |
| 18 Because the Python implementation is free to change internal details, and | |
| 19 the macros may (or may not) expose details for speed, if you do use the | |
| 20 macros you must recompile your extensions with each Python release. | |
| 21 | |
| 22 Never mix calls to PyObject_ memory functions with calls to the platform | |
| 23 malloc/realloc/ calloc/free, or with calls to PyMem_. | |
| 24 */ | |
| 25 | |
| 6 | 26 /* |
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27 Functions and macros for modules that implement new object types. |
| 6 | 28 |
| 23297 | 29 - PyObject_New(type, typeobj) allocates memory for a new object of the given |
| 30 type, and initializes part of it. 'type' must be the C structure type used | |
| 31 to represent the object, and 'typeobj' the address of the corresponding | |
| 32 type object. Reference count and type pointer are filled in; the rest of | |
| 33 the bytes of the object are *undefined*! The resulting expression type is | |
| 34 'type *'. The size of the object is determined by the tp_basicsize field | |
| 35 of the type object. | |
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36 |
| 23297 | 37 - PyObject_NewVar(type, typeobj, n) is similar but allocates a variable-size |
| 38 object with room for n items. In addition to the refcount and type pointer | |
| 39 fields, this also fills in the ob_size field. | |
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40 |
| 23297 | 41 - PyObject_Del(op) releases the memory allocated for an object. It does not |
| 42 run a destructor -- it only frees the memory. PyObject_Free is identical. | |
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43 |
| 23297 | 44 - PyObject_Init(op, typeobj) and PyObject_InitVar(op, typeobj, n) don't |
| 45 allocate memory. Instead of a 'type' parameter, they take a pointer to a | |
| 46 new object (allocated by an arbitrary allocator), and initialize its object | |
| 47 header fields. | |
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48 |
| 23297 | 49 Note that objects created with PyObject_{New, NewVar} are allocated using the |
| 50 specialized Python allocator (implemented in obmalloc.c), if WITH_PYMALLOC is | |
| 51 enabled. In addition, a special debugging allocator is used if PYMALLOC_DEBUG | |
| 52 is also #defined. | |
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53 |
| 23297 | 54 In case a specific form of memory management is needed (for example, if you |
| 55 must use the platform malloc heap(s), or shared memory, or C++ local storage or | |
| 56 operator new), you must first allocate the object with your custom allocator, | |
| 57 then pass its pointer to PyObject_{Init, InitVar} for filling in its Python- | |
| 58 specific fields: reference count, type pointer, possibly others. You should | |
| 59 be aware that Python no control over these objects because they don't | |
| 60 cooperate with the Python memory manager. Such objects may not be eligible | |
| 61 for automatic garbage collection and you have to make sure that they are | |
| 62 released accordingly whenever their destructor gets called (cf. the specific | |
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63 form of memory management you're using). |
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64 |
| 23297 | 65 Unless you have specific memory management requirements, use |
| 66 PyObject_{New, NewVar, Del}. | |
| 67 */ | |
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68 |
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69 /* |
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70 * Raw object memory interface |
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71 * =========================== |
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72 */ |
| 6 | 73 |
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74 /* Functions to call the same malloc/realloc/free as used by Python's |
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75 object allocator. If WITH_PYMALLOC is enabled, these may differ from |
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76 the platform malloc/realloc/free. The Python object allocator is |
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77 designed for fast, cache-conscious allocation of many "small" objects, |
| 23297 | 78 and with low hidden memory overhead. |
| 79 | |
| 80 PyObject_Malloc(0) returns a unique non-NULL pointer if possible. | |
| 81 | |
| 82 PyObject_Realloc(NULL, n) acts like PyObject_Malloc(n). | |
| 83 PyObject_Realloc(p != NULL, 0) does not return NULL, or free the memory | |
| 84 at p. | |
| 85 | |
| 86 Returned pointers must be checked for NULL explicitly; no action is | |
| 87 performed on failure other than to return NULL (no warning it printed, no | |
| 88 exception is set, etc). | |
| 89 | |
| 90 For allocating objects, use PyObject_{New, NewVar} instead whenever | |
| 91 possible. The PyObject_{Malloc, Realloc, Free} family is exposed | |
| 92 so that you can exploit Python's small-block allocator for non-object | |
| 93 uses. If you must use these routines to allocate object memory, make sure | |
| 94 the object gets initialized via PyObject_{Init, InitVar} after obtaining | |
| 95 the raw memory. | |
| 96 */ | |
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97 PyAPI_FUNC(void *) PyObject_Malloc(size_t); |
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98 PyAPI_FUNC(void *) PyObject_Realloc(void *, size_t); |
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99 PyAPI_FUNC(void) PyObject_Free(void *); |
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100 |
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101 |
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102 /* Macros */ |
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103 #ifdef WITH_PYMALLOC |
| 37229 | 104 #ifdef PYMALLOC_DEBUG /* WITH_PYMALLOC && PYMALLOC_DEBUG */ |
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105 PyAPI_FUNC(void *) _PyObject_DebugMalloc(size_t nbytes); |
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106 PyAPI_FUNC(void *) _PyObject_DebugRealloc(void *p, size_t nbytes); |
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107 PyAPI_FUNC(void) _PyObject_DebugFree(void *p); |
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108 PyAPI_FUNC(void) _PyObject_DebugDumpAddress(const void *p); |
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109 PyAPI_FUNC(void) _PyObject_DebugCheckAddress(const void *p); |
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110 PyAPI_FUNC(void) _PyObject_DebugMallocStats(void); |
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111 PyAPI_FUNC(void *) _PyObject_DebugMallocApi(char api, size_t nbytes); |
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112 PyAPI_FUNC(void *) _PyObject_DebugReallocApi(char api, void *p, size_t nbytes); |
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113 PyAPI_FUNC(void) _PyObject_DebugFreeApi(char api, void *p); |
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114 PyAPI_FUNC(void) _PyObject_DebugCheckAddressApi(char api, const void *p); |
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115 PyAPI_FUNC(void *) _PyMem_DebugMalloc(size_t nbytes); |
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116 PyAPI_FUNC(void *) _PyMem_DebugRealloc(void *p, size_t nbytes); |
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117 PyAPI_FUNC(void) _PyMem_DebugFree(void *p); |
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118 #define PyObject_MALLOC _PyObject_DebugMalloc |
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119 #define PyObject_Malloc _PyObject_DebugMalloc |
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120 #define PyObject_REALLOC _PyObject_DebugRealloc |
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121 #define PyObject_Realloc _PyObject_DebugRealloc |
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122 #define PyObject_FREE _PyObject_DebugFree |
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123 #define PyObject_Free _PyObject_DebugFree |
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124 |
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125 #else /* WITH_PYMALLOC && ! PYMALLOC_DEBUG */ |
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126 #define PyObject_MALLOC PyObject_Malloc |
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127 #define PyObject_REALLOC PyObject_Realloc |
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128 #define PyObject_FREE PyObject_Free |
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129 #endif |
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130 |
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131 #else /* ! WITH_PYMALLOC */ |
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132 #define PyObject_MALLOC PyMem_MALLOC |
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133 #define PyObject_REALLOC PyMem_REALLOC |
| 37229 | 134 #define PyObject_FREE PyMem_FREE |
| 23297 | 135 |
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136 #endif /* WITH_PYMALLOC */ |
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137 |
| 23297 | 138 #define PyObject_Del PyObject_Free |
| 139 #define PyObject_DEL PyObject_FREE | |
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140 |
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141 /* for source compatibility with 2.2 */ |
| 23297 | 142 #define _PyObject_Del PyObject_Free |
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143 |
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144 /* |
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145 * Generic object allocator interface |
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146 * ================================== |
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147 */ |
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148 |
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149 /* Functions */ |
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150 PyAPI_FUNC(PyObject *) PyObject_Init(PyObject *, PyTypeObject *); |
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151 PyAPI_FUNC(PyVarObject *) PyObject_InitVar(PyVarObject *, |
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152 PyTypeObject *, Py_ssize_t); |
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153 PyAPI_FUNC(PyObject *) _PyObject_New(PyTypeObject *); |
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154 PyAPI_FUNC(PyVarObject *) _PyObject_NewVar(PyTypeObject *, Py_ssize_t); |
| 6 | 155 |
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156 #define PyObject_New(type, typeobj) \ |
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157 ( (type *) _PyObject_New(typeobj) ) |
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158 #define PyObject_NewVar(type, typeobj, n) \ |
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159 ( (type *) _PyObject_NewVar((typeobj), (n)) ) |
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160 |
| 14006 | 161 /* Macros trading binary compatibility for speed. See also pymem.h. |
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162 Note that these macros expect non-NULL object pointers.*/ |
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163 #define PyObject_INIT(op, typeobj) \ |
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164 ( Py_TYPE(op) = (typeobj), _Py_NewReference((PyObject *)(op)), (op) ) |
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165 #define PyObject_INIT_VAR(op, typeobj, size) \ |
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166 ( Py_SIZE(op) = (size), PyObject_INIT((op), (typeobj)) ) |
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167 |
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168 #define _PyObject_SIZE(typeobj) ( (typeobj)->tp_basicsize ) |
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169 |
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170 /* _PyObject_VAR_SIZE returns the number of bytes (as size_t) allocated for a |
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171 vrbl-size object with nitems items, exclusive of gc overhead (if any). The |
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172 value is rounded up to the closest multiple of sizeof(void *), in order to |
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173 ensure that pointer fields at the end of the object are correctly aligned |
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174 for the platform (this is of special importance for subclasses of, e.g., |
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175 str or long, so that pointers can be stored after the embedded data). |
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176 |
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177 Note that there's no memory wastage in doing this, as malloc has to |
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178 return (at worst) pointer-aligned memory anyway. |
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179 */ |
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180 #if ((SIZEOF_VOID_P - 1) & SIZEOF_VOID_P) != 0 |
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181 # error "_PyObject_VAR_SIZE requires SIZEOF_VOID_P be a power of 2" |
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182 #endif |
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183 |
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184 #define _PyObject_VAR_SIZE(typeobj, nitems) \ |
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185 (size_t) \ |
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186 ( ( (typeobj)->tp_basicsize + \ |
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187 (nitems)*(typeobj)->tp_itemsize + \ |
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188 (SIZEOF_VOID_P - 1) \ |
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189 ) & ~(SIZEOF_VOID_P - 1) \ |
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190 ) |
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191 |
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192 #define PyObject_NEW(type, typeobj) \ |
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193 ( (type *) PyObject_Init( \ |
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194 (PyObject *) PyObject_MALLOC( _PyObject_SIZE(typeobj) ), (typeobj)) ) |
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195 |
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196 #define PyObject_NEW_VAR(type, typeobj, n) \ |
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197 ( (type *) PyObject_InitVar( \ |
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198 (PyVarObject *) PyObject_MALLOC(_PyObject_VAR_SIZE((typeobj),(n)) ),\ |
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199 (typeobj), (n)) ) |
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200 |
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201 /* This example code implements an object constructor with a custom |
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202 allocator, where PyObject_New is inlined, and shows the important |
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203 distinction between two steps (at least): |
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204 1) the actual allocation of the object storage; |
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205 2) the initialization of the Python specific fields |
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206 in this storage with PyObject_{Init, InitVar}. |
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207 |
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208 PyObject * |
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209 YourObject_New(...) |
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210 { |
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211 PyObject *op; |
| 3764 | 212 |
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213 op = (PyObject *) Your_Allocator(_PyObject_SIZE(YourTypeStruct)); |
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214 if (op == NULL) |
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215 return PyErr_NoMemory(); |
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216 |
| 23297 | 217 PyObject_Init(op, &YourTypeStruct); |
| 3764 | 218 |
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219 op->ob_field = value; |
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220 ... |
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221 return op; |
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222 } |
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223 |
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224 Note that in C++, the use of the new operator usually implies that |
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225 the 1st step is performed automatically for you, so in a C++ class |
| 23297 | 226 constructor you would start directly with PyObject_Init/InitVar |
| 227 */ | |
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229 /* |
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230 * Garbage Collection Support |
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231 * ========================== |
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232 */ |
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233 |
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234 /* C equivalent of gc.collect(). */ |
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235 PyAPI_FUNC(Py_ssize_t) PyGC_Collect(void); |
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236 |
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237 /* Test if a type has a GC head */ |
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238 #define PyType_IS_GC(t) PyType_HasFeature((t), Py_TPFLAGS_HAVE_GC) |
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239 |
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240 /* Test if an object has a GC head */ |
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241 #define PyObject_IS_GC(o) (PyType_IS_GC(Py_TYPE(o)) && \ |
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242 (Py_TYPE(o)->tp_is_gc == NULL || Py_TYPE(o)->tp_is_gc(o))) |
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243 |
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244 PyAPI_FUNC(PyVarObject *) _PyObject_GC_Resize(PyVarObject *, Py_ssize_t); |
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245 #define PyObject_GC_Resize(type, op, n) \ |
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246 ( (type *) _PyObject_GC_Resize((PyVarObject *)(op), (n)) ) |
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247 |
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248 /* for source compatibility with 2.2 */ |
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249 #define _PyObject_GC_Del PyObject_GC_Del |
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250 |
| 23297 | 251 /* GC information is stored BEFORE the object structure. */ |
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252 typedef union _gc_head { |
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253 struct { |
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254 union _gc_head *gc_next; |
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255 union _gc_head *gc_prev; |
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256 Py_ssize_t gc_refs; |
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257 } gc; |
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258 long double dummy; /* force worst-case alignment */ |
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259 } PyGC_Head; |
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260 |
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261 extern PyGC_Head *_PyGC_generation0; |
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262 |
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263 #define _Py_AS_GC(o) ((PyGC_Head *)(o)-1) |
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264 |
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265 #define _PyGC_REFS_UNTRACKED (-2) |
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266 #define _PyGC_REFS_REACHABLE (-3) |
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267 #define _PyGC_REFS_TENTATIVELY_UNREACHABLE (-4) |
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268 |
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269 /* Tell the GC to track this object. NB: While the object is tracked the |
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270 * collector it must be safe to call the ob_traverse method. */ |
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271 #define _PyObject_GC_TRACK(o) do { \ |
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272 PyGC_Head *g = _Py_AS_GC(o); \ |
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273 if (g->gc.gc_refs != _PyGC_REFS_UNTRACKED) \ |
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274 Py_FatalError("GC object already tracked"); \ |
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275 g->gc.gc_refs = _PyGC_REFS_REACHABLE; \ |
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276 g->gc.gc_next = _PyGC_generation0; \ |
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277 g->gc.gc_prev = _PyGC_generation0->gc.gc_prev; \ |
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278 g->gc.gc_prev->gc.gc_next = g; \ |
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279 _PyGC_generation0->gc.gc_prev = g; \ |
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280 } while (0); |
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281 |
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282 /* Tell the GC to stop tracking this object. |
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283 * gc_next doesn't need to be set to NULL, but doing so is a good |
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284 * way to provoke memory errors if calling code is confused. |
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285 */ |
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286 #define _PyObject_GC_UNTRACK(o) do { \ |
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287 PyGC_Head *g = _Py_AS_GC(o); \ |
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288 assert(g->gc.gc_refs != _PyGC_REFS_UNTRACKED); \ |
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289 g->gc.gc_refs = _PyGC_REFS_UNTRACKED; \ |
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290 g->gc.gc_prev->gc.gc_next = g->gc.gc_next; \ |
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291 g->gc.gc_next->gc.gc_prev = g->gc.gc_prev; \ |
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292 g->gc.gc_next = NULL; \ |
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293 } while (0); |
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294 |
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295 /* True if the object is currently tracked by the GC. */ |
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296 #define _PyObject_GC_IS_TRACKED(o) \ |
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297 ((_Py_AS_GC(o))->gc.gc_refs != _PyGC_REFS_UNTRACKED) |
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298 |
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299 /* True if the object may be tracked by the GC in the future, or already is. |
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300 This can be useful to implement some optimizations. */ |
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301 #define _PyObject_GC_MAY_BE_TRACKED(obj) \ |
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302 (PyObject_IS_GC(obj) && \ |
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303 (!PyTuple_CheckExact(obj) || _PyObject_GC_IS_TRACKED(obj))) |
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304 |
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305 |
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306 PyAPI_FUNC(PyObject *) _PyObject_GC_Malloc(size_t); |
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307 PyAPI_FUNC(PyObject *) _PyObject_GC_New(PyTypeObject *); |
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308 PyAPI_FUNC(PyVarObject *) _PyObject_GC_NewVar(PyTypeObject *, Py_ssize_t); |
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309 PyAPI_FUNC(void) PyObject_GC_Track(void *); |
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310 PyAPI_FUNC(void) PyObject_GC_UnTrack(void *); |
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311 PyAPI_FUNC(void) PyObject_GC_Del(void *); |
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312 |
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313 #define PyObject_GC_New(type, typeobj) \ |
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314 ( (type *) _PyObject_GC_New(typeobj) ) |
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315 #define PyObject_GC_NewVar(type, typeobj, n) \ |
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316 ( (type *) _PyObject_GC_NewVar((typeobj), (n)) ) |
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317 |
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318 |
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319 /* Utility macro to help write tp_traverse functions. |
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320 * To use this macro, the tp_traverse function must name its arguments |
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321 * "visit" and "arg". This is intended to keep tp_traverse functions |
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322 * looking as much alike as possible. |
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323 */ |
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324 #define Py_VISIT(op) \ |
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325 do { \ |
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326 if (op) { \ |
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327 int vret = visit((PyObject *)(op), arg); \ |
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328 if (vret) \ |
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329 return vret; \ |
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330 } \ |
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331 } while (0) |
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332 |
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333 /* This is here for the sake of backwards compatibility. Extensions that |
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334 * use the old GC API will still compile but the objects will not be |
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335 * tracked by the GC. */ |
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336 #define PyGC_HEAD_SIZE 0 |
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337 #define PyObject_GC_Init(op) |
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338 #define PyObject_GC_Fini(op) |
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339 #define PyObject_AS_GC(op) (op) |
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340 #define PyObject_FROM_GC(op) (op) |
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341 |
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342 |
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343 /* Test if a type supports weak references */ |
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344 #define PyType_SUPPORTS_WEAKREFS(t) \ |
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345 (PyType_HasFeature((t), Py_TPFLAGS_HAVE_WEAKREFS) \ |
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346 && ((t)->tp_weaklistoffset > 0)) |
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347 |
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348 #define PyObject_GET_WEAKREFS_LISTPTR(o) \ |
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349 ((PyObject **) (((char *) (o)) + Py_TYPE(o)->tp_weaklistoffset)) |
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350 |
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351 #ifdef __cplusplus |
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352 } |
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353 #endif |
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354 #endif /* !Py_OBJIMPL_H */ |