Mercurial > cpython-lru_cache-weakref
annotate Include/object.h @ 17322:bd110eadc19a legacy-trunk
One-liner critical fix from Jim Fulton: Eric's string-method crusade
got the order backwards in a line (for .find()).
| author | Tim Peters <tim.peters@gmail.com> |
|---|---|
| date | Thu, 05 Apr 2001 22:26:23 +0000 |
| parents | d446e4ec9b7b |
| children | 32e7d0898eab |
| rev | line source |
|---|---|
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1 #ifndef Py_OBJECT_H |
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2 #define Py_OBJECT_H |
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3 #ifdef __cplusplus |
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4 extern "C" { |
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5 #endif |
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6 |
| 145 | 7 |
| 6 | 8 /* Object and type object interface */ |
| 9 | |
| 10 /* | |
| 11 Objects are structures allocated on the heap. Special rules apply to | |
| 12 the use of objects to ensure they are properly garbage-collected. | |
| 13 Objects are never allocated statically or on the stack; they must be | |
| 14 accessed through special macros and functions only. (Type objects are | |
| 15 exceptions to the first rule; the standard types are represented by | |
| 16 statically initialized type objects.) | |
| 17 | |
| 18 An object has a 'reference count' that is increased or decreased when a | |
| 19 pointer to the object is copied or deleted; when the reference count | |
| 20 reaches zero there are no references to the object left and it can be | |
| 21 removed from the heap. | |
| 22 | |
| 23 An object has a 'type' that determines what it represents and what kind | |
| 24 of data it contains. An object's type is fixed when it is created. | |
| 25 Types themselves are represented as objects; an object contains a | |
| 26 pointer to the corresponding type object. The type itself has a type | |
| 27 pointer pointing to the object representing the type 'type', which | |
| 28 contains a pointer to itself!). | |
| 29 | |
| 30 Objects do not float around in memory; once allocated an object keeps | |
| 31 the same size and address. Objects that must hold variable-size data | |
| 32 can contain pointers to variable-size parts of the object. Not all | |
| 33 objects of the same type have the same size; but the size cannot change | |
| 34 after allocation. (These restrictions are made so a reference to an | |
| 35 object can be simply a pointer -- moving an object would require | |
| 36 updating all the pointers, and changing an object's size would require | |
| 37 moving it if there was another object right next to it.) | |
| 38 | |
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39 Objects are always accessed through pointers of the type 'PyObject *'. |
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40 The type 'PyObject' is a structure that only contains the reference count |
| 6 | 41 and the type pointer. The actual memory allocated for an object |
| 42 contains other data that can only be accessed after casting the pointer | |
| 43 to a pointer to a longer structure type. This longer type must start | |
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44 with the reference count and type fields; the macro PyObject_HEAD should be |
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45 used for this (to accommodate for future changes). The implementation |
| 6 | 46 of a particular object type can cast the object pointer to the proper |
| 47 type and back. | |
| 48 | |
| 49 A standard interface exists for objects that contain an array of items | |
| 50 whose size is determined when the object is allocated. | |
| 51 */ | |
| 52 | |
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53 #ifdef Py_DEBUG |
| 86 | 54 |
| 55 /* Turn on heavy reference debugging */ | |
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56 #define Py_TRACE_REFS |
| 86 | 57 |
| 58 /* Turn on reference counting */ | |
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59 #define Py_REF_DEBUG |
| 86 | 60 |
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61 #endif /* Py_DEBUG */ |
| 6 | 62 |
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63 #ifdef Py_TRACE_REFS |
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64 #define PyObject_HEAD \ |
| 6 | 65 struct _object *_ob_next, *_ob_prev; \ |
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66 int ob_refcnt; \ |
| 6 | 67 struct _typeobject *ob_type; |
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68 #define PyObject_HEAD_INIT(type) 0, 0, 1, type, |
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69 #else /* !Py_TRACE_REFS */ |
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70 #define PyObject_HEAD \ |
| 2058 | 71 int ob_refcnt; \ |
| 6 | 72 struct _typeobject *ob_type; |
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73 #define PyObject_HEAD_INIT(type) 1, type, |
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74 #endif /* !Py_TRACE_REFS */ |
| 6 | 75 |
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76 #define PyObject_VAR_HEAD \ |
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77 PyObject_HEAD \ |
| 2058 | 78 int ob_size; /* Number of items in variable part */ |
| 6 | 79 |
| 80 typedef struct _object { | |
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81 PyObject_HEAD |
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82 } PyObject; |
| 6 | 83 |
| 84 typedef struct { | |
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85 PyObject_VAR_HEAD |
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86 } PyVarObject; |
| 6 | 87 |
| 88 | |
| 89 /* | |
| 90 Type objects contain a string containing the type name (to help somewhat | |
| 91 in debugging), the allocation parameters (see newobj() and newvarobj()), | |
| 92 and methods for accessing objects of the type. Methods are optional,a | |
| 93 nil pointer meaning that particular kind of access is not available for | |
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94 this type. The Py_DECREF() macro uses the tp_dealloc method without |
| 6 | 95 checking for a nil pointer; it should always be implemented except if |
| 96 the implementation can guarantee that the reference count will never | |
| 97 reach zero (e.g., for type objects). | |
| 98 | |
| 99 NB: the methods for certain type groups are now contained in separate | |
| 100 method blocks. | |
| 101 */ | |
| 102 | |
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103 typedef PyObject * (*unaryfunc)(PyObject *); |
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104 typedef PyObject * (*binaryfunc)(PyObject *, PyObject *); |
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105 typedef PyObject * (*ternaryfunc)(PyObject *, PyObject *, PyObject *); |
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106 typedef int (*inquiry)(PyObject *); |
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107 typedef int (*coercion)(PyObject **, PyObject **); |
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108 typedef PyObject *(*intargfunc)(PyObject *, int); |
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109 typedef PyObject *(*intintargfunc)(PyObject *, int, int); |
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110 typedef int(*intobjargproc)(PyObject *, int, PyObject *); |
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111 typedef int(*intintobjargproc)(PyObject *, int, int, PyObject *); |
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112 typedef int(*objobjargproc)(PyObject *, PyObject *, PyObject *); |
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113 typedef int (*getreadbufferproc)(PyObject *, int, void **); |
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114 typedef int (*getwritebufferproc)(PyObject *, int, void **); |
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115 typedef int (*getsegcountproc)(PyObject *, int *); |
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116 typedef int (*getcharbufferproc)(PyObject *, int, const char **); |
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117 typedef int (*objobjproc)(PyObject *, PyObject *); |
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118 typedef int (*visitproc)(PyObject *, void *); |
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119 typedef int (*traverseproc)(PyObject *, visitproc, void *); |
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120 |
| 6 | 121 typedef struct { |
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122 /* For numbers without flag bit Py_TPFLAGS_CHECKTYPES set, all |
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123 arguments are guaranteed to be of the object's type (modulo |
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124 coercion hacks that is -- i.e. if the type's coercion function |
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125 returns other types, then these are allowed as well). Numbers that |
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126 have the Py_TPFLAGS_CHECKTYPES flag bit set should check *both* |
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127 arguments for proper type and implement the necessary conversions |
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128 in the slot functions themselves. */ |
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129 |
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130 binaryfunc nb_add; |
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131 binaryfunc nb_subtract; |
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132 binaryfunc nb_multiply; |
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133 binaryfunc nb_divide; |
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134 binaryfunc nb_remainder; |
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135 binaryfunc nb_divmod; |
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136 ternaryfunc nb_power; |
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137 unaryfunc nb_negative; |
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138 unaryfunc nb_positive; |
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139 unaryfunc nb_absolute; |
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140 inquiry nb_nonzero; |
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141 unaryfunc nb_invert; |
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142 binaryfunc nb_lshift; |
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143 binaryfunc nb_rshift; |
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144 binaryfunc nb_and; |
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145 binaryfunc nb_xor; |
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146 binaryfunc nb_or; |
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147 coercion nb_coerce; |
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148 unaryfunc nb_int; |
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149 unaryfunc nb_long; |
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150 unaryfunc nb_float; |
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151 unaryfunc nb_oct; |
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152 unaryfunc nb_hex; |
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153 binaryfunc nb_inplace_add; |
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154 binaryfunc nb_inplace_subtract; |
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155 binaryfunc nb_inplace_multiply; |
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156 binaryfunc nb_inplace_divide; |
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157 binaryfunc nb_inplace_remainder; |
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158 ternaryfunc nb_inplace_power; |
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159 binaryfunc nb_inplace_lshift; |
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160 binaryfunc nb_inplace_rshift; |
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161 binaryfunc nb_inplace_and; |
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162 binaryfunc nb_inplace_xor; |
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163 binaryfunc nb_inplace_or; |
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164 } PyNumberMethods; |
| 6 | 165 |
| 166 typedef struct { | |
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167 inquiry sq_length; |
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168 binaryfunc sq_concat; |
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169 intargfunc sq_repeat; |
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170 intargfunc sq_item; |
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171 intintargfunc sq_slice; |
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172 intobjargproc sq_ass_item; |
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173 intintobjargproc sq_ass_slice; |
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174 objobjproc sq_contains; |
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175 binaryfunc sq_inplace_concat; |
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176 intargfunc sq_inplace_repeat; |
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177 } PySequenceMethods; |
| 6 | 178 |
| 179 typedef struct { | |
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180 inquiry mp_length; |
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181 binaryfunc mp_subscript; |
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182 objobjargproc mp_ass_subscript; |
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183 } PyMappingMethods; |
| 6 | 184 |
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185 typedef struct { |
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186 getreadbufferproc bf_getreadbuffer; |
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187 getwritebufferproc bf_getwritebuffer; |
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188 getsegcountproc bf_getsegcount; |
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189 getcharbufferproc bf_getcharbuffer; |
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190 } PyBufferProcs; |
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191 |
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192 |
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193 typedef void (*destructor)(PyObject *); |
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194 typedef int (*printfunc)(PyObject *, FILE *, int); |
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195 typedef PyObject *(*getattrfunc)(PyObject *, char *); |
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196 typedef PyObject *(*getattrofunc)(PyObject *, PyObject *); |
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197 typedef int (*setattrfunc)(PyObject *, char *, PyObject *); |
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198 typedef int (*setattrofunc)(PyObject *, PyObject *, PyObject *); |
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199 typedef int (*cmpfunc)(PyObject *, PyObject *); |
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200 typedef PyObject *(*reprfunc)(PyObject *); |
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201 typedef long (*hashfunc)(PyObject *); |
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202 typedef PyObject *(*richcmpfunc) (PyObject *, PyObject *, int); |
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203 |
| 6 | 204 typedef struct _typeobject { |
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205 PyObject_VAR_HEAD |
| 6 | 206 char *tp_name; /* For printing */ |
| 2058 | 207 int tp_basicsize, tp_itemsize; /* For allocation */ |
| 6 | 208 |
| 209 /* Methods to implement standard operations */ | |
| 210 | |
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211 destructor tp_dealloc; |
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212 printfunc tp_print; |
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213 getattrfunc tp_getattr; |
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214 setattrfunc tp_setattr; |
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215 cmpfunc tp_compare; |
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216 reprfunc tp_repr; |
| 6 | 217 |
| 218 /* Method suites for standard classes */ | |
| 219 | |
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220 PyNumberMethods *tp_as_number; |
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221 PySequenceMethods *tp_as_sequence; |
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222 PyMappingMethods *tp_as_mapping; |
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223 |
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224 /* More standard operations (here for binary compatibility) */ |
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225 |
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226 hashfunc tp_hash; |
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227 ternaryfunc tp_call; |
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228 reprfunc tp_str; |
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229 getattrofunc tp_getattro; |
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230 setattrofunc tp_setattro; |
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231 |
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232 /* Functions to access object as input/output buffer */ |
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233 PyBufferProcs *tp_as_buffer; |
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234 |
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235 /* Flags to define presence of optional/expanded features */ |
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236 long tp_flags; |
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237 |
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238 char *tp_doc; /* Documentation string */ |
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239 |
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240 /* call function for all accessible objects */ |
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241 traverseproc tp_traverse; |
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242 |
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243 /* delete references to contained objects */ |
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244 inquiry tp_clear; |
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245 |
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246 /* rich comparisons */ |
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247 richcmpfunc tp_richcompare; |
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248 |
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249 /* weak reference enabler */ |
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250 long tp_weaklistoffset; |
|
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251 |
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* Extended X interface: pixmap objects, colormap objects visual objects,
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252 #ifdef COUNT_ALLOCS |
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253 /* these must be last */ |
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254 int tp_alloc; |
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255 int tp_free; |
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256 int tp_maxalloc; |
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257 struct _typeobject *tp_next; |
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258 #endif |
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259 } PyTypeObject; |
| 6 | 260 |
|
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261 extern DL_IMPORT(PyTypeObject) PyType_Type; /* The type of type objects */ |
| 6 | 262 |
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263 #define PyType_Check(op) ((op)->ob_type == &PyType_Type) |
| 6 | 264 |
| 86 | 265 /* Generic operations on objects */ |
|
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266 extern DL_IMPORT(int) PyObject_Print(PyObject *, FILE *, int); |
|
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267 extern DL_IMPORT(void) _PyObject_Dump(PyObject *); |
|
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268 extern DL_IMPORT(PyObject *) PyObject_Repr(PyObject *); |
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269 extern DL_IMPORT(PyObject *) PyObject_Str(PyObject *); |
|
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This patch adds a new builtin unistr() which behaves like str()
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270 extern DL_IMPORT(PyObject *) PyObject_Unicode(PyObject *); |
|
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271 extern DL_IMPORT(int) PyObject_Compare(PyObject *, PyObject *); |
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272 extern DL_IMPORT(PyObject *) PyObject_RichCompare(PyObject *, PyObject *, int); |
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273 extern DL_IMPORT(int) PyObject_RichCompareBool(PyObject *, PyObject *, int); |
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274 extern DL_IMPORT(PyObject *) PyObject_GetAttrString(PyObject *, char *); |
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275 extern DL_IMPORT(int) PyObject_SetAttrString(PyObject *, char *, PyObject *); |
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276 extern DL_IMPORT(int) PyObject_HasAttrString(PyObject *, char *); |
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277 extern DL_IMPORT(PyObject *) PyObject_GetAttr(PyObject *, PyObject *); |
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278 extern DL_IMPORT(int) PyObject_SetAttr(PyObject *, PyObject *, PyObject *); |
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279 extern DL_IMPORT(int) PyObject_HasAttr(PyObject *, PyObject *); |
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280 extern DL_IMPORT(long) PyObject_Hash(PyObject *); |
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281 extern DL_IMPORT(int) PyObject_IsTrue(PyObject *); |
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282 extern DL_IMPORT(int) PyObject_Not(PyObject *); |
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283 extern DL_IMPORT(int) PyCallable_Check(PyObject *); |
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284 extern DL_IMPORT(int) PyNumber_Coerce(PyObject **, PyObject **); |
|
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285 extern DL_IMPORT(int) PyNumber_CoerceEx(PyObject **, PyObject **); |
| 6 | 286 |
|
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The return value from PyObject_ClearWeakRefs() is no longer meaningful,
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287 extern DL_IMPORT(void) (*PyObject_ClearWeakRefs)(PyObject *); |
|
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288 |
|
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Add prototypes for Py_Repr{Enter,Leave}.
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289 /* Helpers for printing recursive container types */ |
|
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290 extern DL_IMPORT(int) Py_ReprEnter(PyObject *); |
|
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291 extern DL_IMPORT(void) Py_ReprLeave(PyObject *); |
|
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292 |
|
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cca84745da3e
This patch addresses two main issues: (1) There exist some non-fatal
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293 /* Helpers for hash functions */ |
|
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294 extern DL_IMPORT(long) _Py_HashDouble(double); |
|
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295 extern DL_IMPORT(long) _Py_HashPointer(void*); |
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296 |
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297 /* Helper for passing objects to printf and the like */ |
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298 #define PyObject_REPR(obj) PyString_AS_STRING(PyObject_Repr(obj)) |
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299 |
| 6 | 300 /* Flag bits for printing: */ |
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301 #define Py_PRINT_RAW 1 /* No string quotes etc. */ |
| 6 | 302 |
| 303 /* | |
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304 |
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305 Type flags (tp_flags) |
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306 |
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307 These flags are used to extend the type structure in a backwards-compatible |
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308 fashion. Extensions can use the flags to indicate (and test) when a given |
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309 type structure contains a new feature. The Python core will use these when |
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310 introducing new functionality between major revisions (to avoid mid-version |
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311 changes in the PYTHON_API_VERSION). |
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312 |
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313 Arbitration of the flag bit positions will need to be coordinated among |
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314 all extension writers who publically release their extensions (this will |
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315 be fewer than you might expect!).. |
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316 |
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317 Python 1.5.2 introduced the bf_getcharbuffer slot into PyBufferProcs. |
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318 |
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319 Type definitions should use Py_TPFLAGS_DEFAULT for their tp_flags value. |
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320 |
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321 Code can use PyType_HasFeature(type_ob, flag_value) to test whether the |
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322 given type object has a specified feature. |
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323 |
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324 */ |
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325 |
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326 /* PyBufferProcs contains bf_getcharbuffer */ |
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327 #define Py_TPFLAGS_HAVE_GETCHARBUFFER (1L<<0) |
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328 |
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329 /* PySequenceMethods contains sq_contains */ |
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330 #define Py_TPFLAGS_HAVE_SEQUENCE_IN (1L<<1) |
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331 |
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332 /* Objects which participate in garbage collection (see objimp.h) */ |
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333 #ifdef WITH_CYCLE_GC |
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334 #define Py_TPFLAGS_GC (1L<<2) |
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335 #else |
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336 #define Py_TPFLAGS_GC 0 |
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337 #endif |
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338 |
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339 /* PySequenceMethods and PyNumberMethods contain in-place operators */ |
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340 #define Py_TPFLAGS_HAVE_INPLACEOPS (1L<<3) |
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341 |
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342 /* PyNumberMethods do their own coercion */ |
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343 #define Py_TPFLAGS_CHECKTYPES (1L<<4) |
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344 |
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345 #define Py_TPFLAGS_HAVE_RICHCOMPARE (1L<<5) |
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346 |
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347 /* Objects which are weakly referencable if their tp_weaklistoffset is >0 */ |
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348 /* XXX Should this have the same value as Py_TPFLAGS_HAVE_RICHCOMPARE? |
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349 * These both indicate a feature that appeared in the same alpha release. |
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350 */ |
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351 #define Py_TPFLAGS_HAVE_WEAKREFS (1L<<6) |
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352 |
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353 #define Py_TPFLAGS_DEFAULT ( \ |
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354 Py_TPFLAGS_HAVE_GETCHARBUFFER | \ |
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355 Py_TPFLAGS_HAVE_SEQUENCE_IN | \ |
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356 Py_TPFLAGS_HAVE_INPLACEOPS | \ |
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357 Py_TPFLAGS_HAVE_RICHCOMPARE | \ |
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358 Py_TPFLAGS_HAVE_WEAKREFS | \ |
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359 0) |
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360 |
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361 #define PyType_HasFeature(t,f) (((t)->tp_flags & (f)) != 0) |
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362 |
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363 |
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364 /* |
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365 The macros Py_INCREF(op) and Py_DECREF(op) are used to increment or decrement |
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366 reference counts. Py_DECREF calls the object's deallocator function; for |
| 6 | 367 objects that don't contain references to other objects or heap memory |
| 368 this can be the standard function free(). Both macros can be used | |
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369 wherever a void expression is allowed. The argument shouldn't be a |
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370 NIL pointer. The macro _Py_NewReference(op) is used only to initialize |
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371 reference counts to 1; it is defined here for convenience. |
| 6 | 372 |
| 373 We assume that the reference count field can never overflow; this can | |
| 374 be proven when the size of the field is the same as the pointer size | |
| 375 but even with a 16-bit reference count field it is pretty unlikely so | |
| 376 we ignore the possibility. (If you are paranoid, make it a long.) | |
| 377 | |
| 378 Type objects should never be deallocated; the type pointer in an object | |
| 379 is not considered to be a reference to the type object, to save | |
| 380 complications in the deallocation function. (This is actually a | |
| 381 decision that's up to the implementer of each new type so if you want, | |
| 382 you can count such references to the type object.) | |
| 383 | |
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384 *** WARNING*** The Py_DECREF macro must have a side-effect-free argument |
| 6 | 385 since it may evaluate its argument multiple times. (The alternative |
| 386 would be to mace it a proper function or assign it to a global temporary | |
| 387 variable first, both of which are slower; and in a multi-threaded | |
| 388 environment the global variable trick is not safe.) | |
| 389 */ | |
| 390 | |
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391 #ifdef Py_TRACE_REFS |
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392 #ifndef Py_REF_DEBUG |
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393 #define Py_REF_DEBUG |
| 6 | 394 #endif |
| 395 #endif | |
| 396 | |
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397 #ifdef Py_TRACE_REFS |
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398 extern DL_IMPORT(void) _Py_Dealloc(PyObject *); |
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399 extern DL_IMPORT(void) _Py_NewReference(PyObject *); |
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400 extern DL_IMPORT(void) _Py_ForgetReference(PyObject *); |
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401 extern DL_IMPORT(void) _Py_PrintReferences(FILE *); |
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402 extern DL_IMPORT(void) _Py_ResetReferences(void); |
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403 #endif |
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404 |
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405 #ifndef Py_TRACE_REFS |
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406 #ifdef COUNT_ALLOCS |
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407 #define _Py_Dealloc(op) ((op)->ob_type->tp_free++, (*(op)->ob_type->tp_dealloc)((PyObject *)(op))) |
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408 #define _Py_ForgetReference(op) ((op)->ob_type->tp_free++) |
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409 #else /* !COUNT_ALLOCS */ |
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410 #define _Py_Dealloc(op) (*(op)->ob_type->tp_dealloc)((PyObject *)(op)) |
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411 #define _Py_ForgetReference(op) /*empty*/ |
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412 #endif /* !COUNT_ALLOCS */ |
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413 #endif /* !Py_TRACE_REFS */ |
| 6 | 414 |
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415 #ifdef COUNT_ALLOCS |
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416 extern DL_IMPORT(void) inc_count(PyTypeObject *); |
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417 #endif |
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418 |
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419 #ifdef Py_REF_DEBUG |
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420 |
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421 extern DL_IMPORT(long) _Py_RefTotal; |
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422 |
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423 #ifndef Py_TRACE_REFS |
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424 #ifdef COUNT_ALLOCS |
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425 #define _Py_NewReference(op) (inc_count((op)->ob_type), _Py_RefTotal++, (op)->ob_refcnt = 1) |
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426 #else |
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427 #define _Py_NewReference(op) (_Py_RefTotal++, (op)->ob_refcnt = 1) |
| 6 | 428 #endif |
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429 #endif /* !Py_TRACE_REFS */ |
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430 |
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431 #define Py_INCREF(op) (_Py_RefTotal++, (op)->ob_refcnt++) |
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432 #define Py_DECREF(op) \ |
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433 if (--_Py_RefTotal, (--((op)->ob_refcnt) != 0)) \ |
| 6 | 434 ; \ |
| 435 else \ | |
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436 _Py_Dealloc((PyObject *)(op)) |
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437 #else /* !Py_REF_DEBUG */ |
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438 |
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439 #ifdef COUNT_ALLOCS |
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440 #define _Py_NewReference(op) (inc_count((op)->ob_type), (op)->ob_refcnt = 1) |
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441 #else |
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442 #define _Py_NewReference(op) ((op)->ob_refcnt = 1) |
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443 #endif |
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444 |
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445 #define Py_INCREF(op) ((op)->ob_refcnt++) |
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446 #define Py_DECREF(op) \ |
| 2058 | 447 if (--(op)->ob_refcnt != 0) \ |
| 6 | 448 ; \ |
| 449 else \ | |
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450 _Py_Dealloc((PyObject *)(op)) |
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451 #endif /* !Py_REF_DEBUG */ |
| 6 | 452 |
| 86 | 453 /* Macros to use in case the object pointer may be NULL: */ |
| 454 | |
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455 #define Py_XINCREF(op) if ((op) == NULL) ; else Py_INCREF(op) |
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456 #define Py_XDECREF(op) if ((op) == NULL) ; else Py_DECREF(op) |
| 6 | 457 |
| 458 /* | |
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459 _Py_NoneStruct is an object of undefined type which can be used in contexts |
| 6 | 460 where NULL (nil) is not suitable (since NULL often means 'error'). |
| 461 | |
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462 Don't forget to apply Py_INCREF() when returning this value!!! |
| 6 | 463 */ |
| 464 | |
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465 extern DL_IMPORT(PyObject) _Py_NoneStruct; /* Don't use this directly */ |
| 6 | 466 |
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467 #define Py_None (&_Py_NoneStruct) |
| 6 | 468 |
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469 /* |
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470 Py_NotImplemented is a singleton used to signal that an operation is |
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471 not implemented for a given type combination. |
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472 */ |
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473 |
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474 extern DL_IMPORT(PyObject) _Py_NotImplementedStruct; /* Don't use this directly */ |
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475 |
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476 #define Py_NotImplemented (&_Py_NotImplementedStruct) |
| 6 | 477 |
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478 /* Rich comparison opcodes */ |
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479 #define Py_LT 0 |
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480 #define Py_LE 1 |
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481 #define Py_EQ 2 |
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482 #define Py_NE 3 |
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483 #define Py_GT 4 |
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484 #define Py_GE 5 |
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485 |
| 6 | 486 /* |
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487 A common programming style in Python requires the forward declaration |
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488 of static, initialized structures, e.g. for a type object that is used |
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489 by the functions whose address must be used in the initializer. |
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490 Some compilers (notably SCO ODT 3.0, I seem to remember early AIX as |
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491 well) botch this if you use the static keyword for both declarations |
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492 (they allocate two objects, and use the first, uninitialized one until |
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493 the second declaration is encountered). Therefore, the forward |
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494 declaration should use the 'forwardstatic' keyword. This expands to |
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495 static on most systems, but to extern on a few. The actual storage |
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496 and name will still be static because the second declaration is |
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497 static, so no linker visible symbols will be generated. (Standard C |
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498 compilers take offense to the extern forward declaration of a static |
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499 object, so I can't just put extern in all cases. :-( ) |
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500 */ |
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501 |
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502 #ifdef BAD_STATIC_FORWARD |
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503 #define staticforward extern |
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504 #define statichere static |
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505 #else /* !BAD_STATIC_FORWARD */ |
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506 #define staticforward static |
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507 #define statichere static |
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508 #endif /* !BAD_STATIC_FORWARD */ |
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509 |
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510 |
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511 /* |
| 6 | 512 More conventions |
| 513 ================ | |
| 514 | |
| 515 Argument Checking | |
| 516 ----------------- | |
| 517 | |
| 518 Functions that take objects as arguments normally don't check for nil | |
| 519 arguments, but they do check the type of the argument, and return an | |
| 520 error if the function doesn't apply to the type. | |
| 521 | |
| 522 Failure Modes | |
| 523 ------------- | |
| 524 | |
| 525 Functions may fail for a variety of reasons, including running out of | |
| 86 | 526 memory. This is communicated to the caller in two ways: an error string |
| 527 is set (see errors.h), and the function result differs: functions that | |
| 528 normally return a pointer return NULL for failure, functions returning | |
| 529 an integer return -1 (which could be a legal return value too!), and | |
| 530 other functions return 0 for success and -1 for failure. | |
| 531 Callers should always check for errors before using the result. | |
| 6 | 532 |
| 533 Reference Counts | |
| 534 ---------------- | |
| 535 | |
| 536 It takes a while to get used to the proper usage of reference counts. | |
| 537 | |
| 538 Functions that create an object set the reference count to 1; such new | |
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539 objects must be stored somewhere or destroyed again with Py_DECREF(). |
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540 Functions that 'store' objects such as PyTuple_SetItem() and |
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541 PyDict_SetItemString() |
| 6 | 542 don't increment the reference count of the object, since the most |
| 543 frequent use is to store a fresh object. Functions that 'retrieve' | |
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544 objects such as PyTuple_GetItem() and PyDict_GetItemString() also |
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545 don't increment |
| 6 | 546 the reference count, since most frequently the object is only looked at |
| 547 quickly. Thus, to retrieve an object and store it again, the caller | |
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548 must call Py_INCREF() explicitly. |
| 6 | 549 |
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550 NOTE: functions that 'consume' a reference count like |
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551 PyList_SetItemString() even consume the reference if the object wasn't |
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552 stored, to simplify error handling. |
| 6 | 553 |
| 554 It seems attractive to make other functions that take an object as | |
| 555 argument consume a reference count; however this may quickly get | |
| 556 confusing (even the current practice is already confusing). Consider | |
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557 it carefully, it may save lots of calls to Py_INCREF() and Py_DECREF() at |
| 6 | 558 times. |
| 559 */ | |
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560 |
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561 /* |
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562 trashcan |
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563 CT 2k0130 |
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564 non-recursively destroy nested objects |
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565 |
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566 CT 2k0223 |
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567 redefinition for better locality and less overhead. |
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568 |
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569 Objects that want to be recursion safe need to use |
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570 the macro's |
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571 Py_TRASHCAN_SAFE_BEGIN(name) |
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572 and |
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573 Py_TRASHCAN_SAFE_END(name) |
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574 surrounding their actual deallocation code. |
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575 |
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576 It would be nice to do this using the thread state. |
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577 Also, we could do an exact stack measure then. |
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578 Unfortunately, deallocations also take place when |
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579 the thread state is undefined. |
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Guido van Rossum <guido@python.org>
parents:
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580 |
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Christian Tismer -- total rewrite on trashcan code.
Guido van Rossum <guido@python.org>
parents:
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581 CT 2k0422 complete rewrite. |
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Christian Tismer -- total rewrite on trashcan code.
Guido van Rossum <guido@python.org>
parents:
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582 There is no need to allocate new objects. |
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Christian Tismer -- total rewrite on trashcan code.
Guido van Rossum <guido@python.org>
parents:
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583 Everything is done vialob_refcnt and ob_type now. |
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Christian Tismer -- total rewrite on trashcan code.
Guido van Rossum <guido@python.org>
parents:
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584 Adding support for free-threading should be easy, too. |
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Christian Tismer's "trashcan" patch:
Guido van Rossum <guido@python.org>
parents:
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585 */ |
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Guido van Rossum <guido@python.org>
parents:
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586 |
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587 #define PyTrash_UNWIND_LEVEL 50 |
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588 |
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589 #define Py_TRASHCAN_SAFE_BEGIN(op) \ |
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590 { \ |
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591 ++_PyTrash_delete_nesting; \ |
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592 if (_PyTrash_delete_nesting < PyTrash_UNWIND_LEVEL) { \ |
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593 |
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594 #define Py_TRASHCAN_SAFE_END(op) \ |
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595 ;} \ |
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596 else \ |
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597 _PyTrash_deposit_object((PyObject*)op);\ |
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598 --_PyTrash_delete_nesting; \ |
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599 if (_PyTrash_delete_later && _PyTrash_delete_nesting <= 0) \ |
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600 _PyTrash_destroy_chain(); \ |
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601 } \ |
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602 |
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85520c220067
Got RID of redundant coercions in longobject.c (as spotted by Greg
Tim Peters <tim.peters@gmail.com>
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603 extern DL_IMPORT(void) _PyTrash_deposit_object(PyObject*); |
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604 extern DL_IMPORT(void) _PyTrash_destroy_chain(void); |
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parents:
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605 |
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606 extern DL_IMPORT(int) _PyTrash_delete_nesting; |
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607 extern DL_IMPORT(PyObject *) _PyTrash_delete_later; |
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608 |
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609 /* swap the "xx" to check the speed loss */ |
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610 |
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611 #define xxPy_TRASHCAN_SAFE_BEGIN(op) |
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612 #define xxPy_TRASHCAN_SAFE_END(op) ; |
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613 |
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1329
519c25039c6a
* Added support for X11 modules.
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614 #ifdef __cplusplus |
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615 } |
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616 #endif |
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617 #endif /* !Py_OBJECT_H */ |