Mercurial > cpython-lru_cache-weakref

annotate Include/object.h @ 44825:ef859cd754a7 legacy-trunk

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Fixed a wrong assumption in configure.in and Include/pyport.h. The is finite function is not called isfinite() but finite(). Sorry, my fault. :)
author Christian Heimes <christian@cheimes.de>
date Sun, 20 Jan 2008 14:28:28 +0000
parents 387d48c3a0b3
children ea3fe302d392
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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7
6
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8 /* Object and type object interface */
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9
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10 /*
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11 Objects are structures allocated on the heap. Special rules apply to
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12 the use of objects to ensure they are properly garbage-collected.
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13 Objects are never allocated statically or on the stack; they must be
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14 accessed through special macros and functions only. (Type objects are
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15 exceptions to the first rule; the standard types are represented by
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16 statically initialized type objects, although work on type/class unification
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17 for Python 2.2 made it possible to have heap-allocated type objects too).
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18
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19 An object has a 'reference count' that is increased or decreased when a
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20 pointer to the object is copied or deleted; when the reference count
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21 reaches zero there are no references to the object left and it can be
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22 removed from the heap.
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23
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24 An object has a 'type' that determines what it represents and what kind
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25 of data it contains. An object's type is fixed when it is created.
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26 Types themselves are represented as objects; an object contains a
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27 pointer to the corresponding type object. The type itself has a type
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28 pointer pointing to the object representing the type 'type', which
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29 contains a pointer to itself!).
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30
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31 Objects do not float around in memory; once allocated an object keeps
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32 the same size and address. Objects that must hold variable-size data
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33 can contain pointers to variable-size parts of the object. Not all
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34 objects of the same type have the same size; but the size cannot change
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35 after allocation. (These restrictions are made so a reference to an
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36 object can be simply a pointer -- moving an object would require
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37 updating all the pointers, and changing an object's size would require
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38 moving it if there was another object right next to it.)
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39
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40 Objects are always accessed through pointers of the type 'PyObject *'.
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41 The type 'PyObject' is a structure that only contains the reference count
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42 and the type pointer. The actual memory allocated for an object
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43 contains other data that can only be accessed after casting the pointer
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44 to a pointer to a longer structure type. This longer type must start
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45 with the reference count and type fields; the macro PyObject_HEAD should be
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46 used for this (to accommodate for future changes). The implementation
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47 of a particular object type can cast the object pointer to the proper
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48 type and back.
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49
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50 A standard interface exists for objects that contain an array of items
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51 whose size is determined when the object is allocated.
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52 */
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53
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54 /* Py_DEBUG implies Py_TRACE_REFS. */
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55 #if defined(Py_DEBUG) && !defined(Py_TRACE_REFS)
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56 #define Py_TRACE_REFS
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57 #endif
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58
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59 /* Py_TRACE_REFS implies Py_REF_DEBUG. */
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60 #if defined(Py_TRACE_REFS) && !defined(Py_REF_DEBUG)
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61 #define Py_REF_DEBUG
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62 #endif
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63
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64 #ifdef Py_TRACE_REFS
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65 /* Define pointers to support a doubly-linked list of all live heap objects. */
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66 #define _PyObject_HEAD_EXTRA \
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67 struct _object *_ob_next; \
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68 struct _object *_ob_prev;
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69
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70 #define _PyObject_EXTRA_INIT 0, 0,
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71
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72 #else
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73 #define _PyObject_HEAD_EXTRA
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74 #define _PyObject_EXTRA_INIT
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75 #endif
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76
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77 /* PyObject_HEAD defines the initial segment of every PyObject. */
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78 #define PyObject_HEAD \
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79 _PyObject_HEAD_EXTRA \
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80 Py_ssize_t ob_refcnt; \
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81 struct _typeobject *ob_type;
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82
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83 #define PyObject_HEAD_INIT(type) \
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84 _PyObject_EXTRA_INIT \
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85 1, type,
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86
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87 #define PyVarObject_HEAD_INIT(type, size) \
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88 PyObject_HEAD_INIT(type) size,
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89
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90 /* PyObject_VAR_HEAD defines the initial segment of all variable-size
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91 * container objects. These end with a declaration of an array with 1
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92 * element, but enough space is malloc'ed so that the array actually
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93 * has room for ob_size elements. Note that ob_size is an element count,
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94 * not necessarily a byte count.
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95 */
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96 #define PyObject_VAR_HEAD \
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97 PyObject_HEAD \
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98 Py_ssize_t ob_size; /* Number of items in variable part */
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99 #define Py_INVALID_SIZE (Py_ssize_t)-1
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100
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101 /* Nothing is actually declared to be a PyObject, but every pointer to
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102 * a Python object can be cast to a PyObject*. This is inheritance built
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103 * by hand. Similarly every pointer to a variable-size Python object can,
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104 * in addition, be cast to PyVarObject*.
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105 */
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106 typedef struct _object {
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107 PyObject_HEAD
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108 } PyObject;
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110 typedef struct {
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111 PyObject_VAR_HEAD
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112 } PyVarObject;
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113
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114 #define Py_REFCNT(ob) (((PyObject*)(ob))->ob_refcnt)
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115 #define Py_TYPE(ob) (((PyObject*)(ob))->ob_type)
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116 #define Py_SIZE(ob) (((PyVarObject*)(ob))->ob_size)
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117
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118 /* B/w compatibility */
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119 #define Py_Refcnt(ob) Py_REFCNT(op)
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120 #define Py_Type(op) Py_TYPE(op)
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121 #define Py_Size(op) Py_SIZE(op)
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123 /*
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124 Type objects contain a string containing the type name (to help somewhat
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125 in debugging), the allocation parameters (see PyObject_New() and
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126 PyObject_NewVar()),
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127 and methods for accessing objects of the type. Methods are optional, a
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128 nil pointer meaning that particular kind of access is not available for
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129 this type. The Py_DECREF() macro uses the tp_dealloc method without
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130 checking for a nil pointer; it should always be implemented except if
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131 the implementation can guarantee that the reference count will never
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132 reach zero (e.g., for statically allocated type objects).
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134 NB: the methods for certain type groups are now contained in separate
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135 method blocks.
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136 */
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137
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138 typedef PyObject * (*unaryfunc)(PyObject *);
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139 typedef PyObject * (*binaryfunc)(PyObject *, PyObject *);
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140 typedef PyObject * (*ternaryfunc)(PyObject *, PyObject *, PyObject *);
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141 typedef int (*inquiry)(PyObject *);
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142 typedef Py_ssize_t (*lenfunc)(PyObject *);
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143 typedef int (*coercion)(PyObject **, PyObject **);
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144 typedef PyObject *(*intargfunc)(PyObject *, int) Py_DEPRECATED(2.5);
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145 typedef PyObject *(*intintargfunc)(PyObject *, int, int) Py_DEPRECATED(2.5);
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146 typedef PyObject *(*ssizeargfunc)(PyObject *, Py_ssize_t);
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147 typedef PyObject *(*ssizessizeargfunc)(PyObject *, Py_ssize_t, Py_ssize_t);
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148 typedef int(*intobjargproc)(PyObject *, int, PyObject *);
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149 typedef int(*intintobjargproc)(PyObject *, int, int, PyObject *);
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150 typedef int(*ssizeobjargproc)(PyObject *, Py_ssize_t, PyObject *);
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151 typedef int(*ssizessizeobjargproc)(PyObject *, Py_ssize_t, Py_ssize_t, PyObject *);
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152 typedef int(*objobjargproc)(PyObject *, PyObject *, PyObject *);
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153
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154 /* int-based buffer interface */
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155 typedef int (*getreadbufferproc)(PyObject *, int, void **);
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156 typedef int (*getwritebufferproc)(PyObject *, int, void **);
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157 typedef int (*getsegcountproc)(PyObject *, int *);
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158 typedef int (*getcharbufferproc)(PyObject *, int, char **);
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159 /* ssize_t-based buffer interface */
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160 typedef Py_ssize_t (*readbufferproc)(PyObject *, Py_ssize_t, void **);
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161 typedef Py_ssize_t (*writebufferproc)(PyObject *, Py_ssize_t, void **);
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162 typedef Py_ssize_t (*segcountproc)(PyObject *, Py_ssize_t *);
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163 typedef Py_ssize_t (*charbufferproc)(PyObject *, Py_ssize_t, char **);
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164
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165 typedef int (*objobjproc)(PyObject *, PyObject *);
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166 typedef int (*visitproc)(PyObject *, void *);
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167 typedef int (*traverseproc)(PyObject *, visitproc, void *);
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168
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169 typedef struct {
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170 /* For numbers without flag bit Py_TPFLAGS_CHECKTYPES set, all
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171 arguments are guaranteed to be of the object's type (modulo
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172 coercion hacks -- i.e. if the type's coercion function
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173 returns other types, then these are allowed as well). Numbers that
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174 have the Py_TPFLAGS_CHECKTYPES flag bit set should check *both*
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175 arguments for proper type and implement the necessary conversions
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176 in the slot functions themselves. */
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177
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178 binaryfunc nb_add;
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179 binaryfunc nb_subtract;
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180 binaryfunc nb_multiply;
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181 binaryfunc nb_divide;
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182 binaryfunc nb_remainder;
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183 binaryfunc nb_divmod;
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184 ternaryfunc nb_power;
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185 unaryfunc nb_negative;
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186 unaryfunc nb_positive;
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187 unaryfunc nb_absolute;
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188 inquiry nb_nonzero;
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189 unaryfunc nb_invert;
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190 binaryfunc nb_lshift;
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191 binaryfunc nb_rshift;
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192 binaryfunc nb_and;
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193 binaryfunc nb_xor;
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194 binaryfunc nb_or;
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195 coercion nb_coerce;
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196 unaryfunc nb_int;
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197 unaryfunc nb_long;
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198 unaryfunc nb_float;
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199 unaryfunc nb_oct;
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200 unaryfunc nb_hex;
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201 /* Added in release 2.0 */
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202 binaryfunc nb_inplace_add;
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203 binaryfunc nb_inplace_subtract;
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204 binaryfunc nb_inplace_multiply;
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205 binaryfunc nb_inplace_divide;
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206 binaryfunc nb_inplace_remainder;
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207 ternaryfunc nb_inplace_power;
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208 binaryfunc nb_inplace_lshift;
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209 binaryfunc nb_inplace_rshift;
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210 binaryfunc nb_inplace_and;
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211 binaryfunc nb_inplace_xor;
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212 binaryfunc nb_inplace_or;
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213
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214 /* Added in release 2.2 */
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215 /* The following require the Py_TPFLAGS_HAVE_CLASS flag */
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216 binaryfunc nb_floor_divide;
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217 binaryfunc nb_true_divide;
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218 binaryfunc nb_inplace_floor_divide;
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219 binaryfunc nb_inplace_true_divide;
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220
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221 /* Added in release 2.5 */
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222 unaryfunc nb_index;
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223 } PyNumberMethods;
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224
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225 typedef struct {
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226 lenfunc sq_length;
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227 binaryfunc sq_concat;
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228 ssizeargfunc sq_repeat;
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229 ssizeargfunc sq_item;
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230 ssizessizeargfunc sq_slice;
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231 ssizeobjargproc sq_ass_item;
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232 ssizessizeobjargproc sq_ass_slice;
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233 objobjproc sq_contains;
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234 /* Added in release 2.0 */
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235 binaryfunc sq_inplace_concat;
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236 ssizeargfunc sq_inplace_repeat;
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237 } PySequenceMethods;
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238
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239 typedef struct {
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240 lenfunc mp_length;
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241 binaryfunc mp_subscript;
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242 objobjargproc mp_ass_subscript;
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243 } PyMappingMethods;
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244
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245 typedef struct {
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246 readbufferproc bf_getreadbuffer;
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247 writebufferproc bf_getwritebuffer;
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248 segcountproc bf_getsegcount;
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249 charbufferproc bf_getcharbuffer;
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250 } PyBufferProcs;
24122
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Tim Peters <tim.peters@gmail.com>
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251
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252
22969
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253 typedef void (*freefunc)(void *);
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254 typedef void (*destructor)(PyObject *);
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255 typedef int (*printfunc)(PyObject *, FILE *, int);
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256 typedef PyObject *(*getattrfunc)(PyObject *, char *);
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257 typedef PyObject *(*getattrofunc)(PyObject *, PyObject *);
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258 typedef int (*setattrfunc)(PyObject *, char *, PyObject *);
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259 typedef int (*setattrofunc)(PyObject *, PyObject *, PyObject *);
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260 typedef int (*cmpfunc)(PyObject *, PyObject *);
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261 typedef PyObject *(*reprfunc)(PyObject *);
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262 typedef long (*hashfunc)(PyObject *);
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263 typedef PyObject *(*richcmpfunc) (PyObject *, PyObject *, int);
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264 typedef PyObject *(*getiterfunc) (PyObject *);
17617
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265 typedef PyObject *(*iternextfunc) (PyObject *);
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266 typedef PyObject *(*descrgetfunc) (PyObject *, PyObject *, PyObject *);
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267 typedef int (*descrsetfunc) (PyObject *, PyObject *, PyObject *);
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268 typedef int (*initproc)(PyObject *, PyObject *, PyObject *);
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269 typedef PyObject *(*newfunc)(struct _typeobject *, PyObject *, PyObject *);
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270 typedef PyObject *(*allocfunc)(struct _typeobject *, Py_ssize_t);
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271
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272 typedef struct _typeobject {
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273 PyObject_VAR_HEAD
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274 const char *tp_name; /* For printing, in format "<module>.<name>" */
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275 Py_ssize_t tp_basicsize, tp_itemsize; /* For allocation */
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276
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277 /* Methods to implement standard operations */
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278
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279 destructor tp_dealloc;
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280 printfunc tp_print;
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281 getattrfunc tp_getattr;
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282 setattrfunc tp_setattr;
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283 cmpfunc tp_compare;
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284 reprfunc tp_repr;
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285
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286 /* Method suites for standard classes */
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287
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288 PyNumberMethods *tp_as_number;
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289 PySequenceMethods *tp_as_sequence;
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290 PyMappingMethods *tp_as_mapping;
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291
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292 /* More standard operations (here for binary compatibility) */
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293
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294 hashfunc tp_hash;
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295 ternaryfunc tp_call;
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296 reprfunc tp_str;
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297 getattrofunc tp_getattro;
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298 setattrofunc tp_setattro;
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299
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300 /* Functions to access object as input/output buffer */
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301 PyBufferProcs *tp_as_buffer;
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302
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303 /* Flags to define presence of optional/expanded features */
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304 long tp_flags;
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305
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306 const char *tp_doc; /* Documentation string */
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307
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308 /* Assigned meaning in release 2.0 */
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309 /* call function for all accessible objects */
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310 traverseproc tp_traverse;
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311
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312 /* delete references to contained objects */
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313 inquiry tp_clear;
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314
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315 /* Assigned meaning in release 2.1 */
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316 /* rich comparisons */
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317 richcmpfunc tp_richcompare;
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318
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319 /* weak reference enabler */
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320 Py_ssize_t tp_weaklistoffset;
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321
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322 /* Added in release 2.2 */
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323 /* Iterators */
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324 getiterfunc tp_iter;
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325 iternextfunc tp_iternext;
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326
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327 /* Attribute descriptor and subclassing stuff */
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328 struct PyMethodDef *tp_methods;
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329 struct PyMemberDef *tp_members;
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330 struct PyGetSetDef *tp_getset;
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331 struct _typeobject *tp_base;
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332 PyObject *tp_dict;
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333 descrgetfunc tp_descr_get;
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334 descrsetfunc tp_descr_set;
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335 Py_ssize_t tp_dictoffset;
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336 initproc tp_init;
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337 allocfunc tp_alloc;
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338 newfunc tp_new;
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339 freefunc tp_free; /* Low-level free-memory routine */
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340 inquiry tp_is_gc; /* For PyObject_IS_GC */
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341 PyObject *tp_bases;
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342 PyObject *tp_mro; /* method resolution order */
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343 PyObject *tp_cache;
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344 PyObject *tp_subclasses;
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345 PyObject *tp_weaklist;
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346 destructor tp_del;
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347
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348 /* Type attribute cache version tag. Added in version 2.6 */
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349 unsigned int tp_version_tag;
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350
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351 #ifdef COUNT_ALLOCS
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352 /* these must be last and never explicitly initialized */
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353 Py_ssize_t tp_allocs;
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354 Py_ssize_t tp_frees;
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355 Py_ssize_t tp_maxalloc;
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356 struct _typeobject *tp_prev;
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357 struct _typeobject *tp_next;
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358 #endif
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359 } PyTypeObject;
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360
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361
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362 /* The *real* layout of a type object when allocated on the heap */
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363 typedef struct _heaptypeobject {
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364 /* Note: there's a dependency on the order of these members
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365 in slotptr() in typeobject.c . */
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366 PyTypeObject ht_type;
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367 PyNumberMethods as_number;
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368 PyMappingMethods as_mapping;
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369 PySequenceMethods as_sequence; /* as_sequence comes after as_mapping,
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370 so that the mapping wins when both
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371 the mapping and the sequence define
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372 a given operator (e.g. __getitem__).
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373 see add_operators() in typeobject.c . */
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374 PyBufferProcs as_buffer;
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375 PyObject *ht_name, *ht_slots;
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376 /* here are optional user slots, followed by the members. */
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377 } PyHeapTypeObject;
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378
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379 /* access macro to the members which are floating "behind" the object */
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380 #define PyHeapType_GET_MEMBERS(etype) \
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381 ((PyMemberDef *)(((char *)etype) + Py_TYPE(etype)->tp_basicsize))
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382
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383
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384 /* Generic type check */
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parents: 24280
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385 PyAPI_FUNC(int) PyType_IsSubtype(PyTypeObject *, PyTypeObject *);
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386 #define PyObject_TypeCheck(ob, tp) \
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parents: 42333
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387 (Py_TYPE(ob) == (tp) || PyType_IsSubtype(Py_TYPE(ob), (tp)))
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388
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389 PyAPI_DATA(PyTypeObject) PyType_Type; /* built-in 'type' */
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parents: 24280
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390 PyAPI_DATA(PyTypeObject) PyBaseObject_Type; /* built-in 'object' */
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391 PyAPI_DATA(PyTypeObject) PySuper_Type; /* built-in 'super' */
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392
40908
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Neal Norwitz <nnorwitz@gmail.com>
parents: 39463
diff changeset
393 #define PyType_Check(op) \
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Christian Heimes <christian@cheimes.de>
parents: 42333
diff changeset
394 PyType_FastSubclass(Py_TYPE(op), Py_TPFLAGS_TYPE_SUBCLASS)
26384b8180c7 #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE, Py_TYPE and Py_REFCNT. Macros for b/w compatibility are available.
Christian Heimes <christian@cheimes.de>
parents: 42333
diff changeset
395 #define PyType_CheckExact(op) (Py_TYPE(op) == &PyType_Type)
18933
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 17617
diff changeset
396
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
397 PyAPI_FUNC(int) PyType_Ready(PyTypeObject *);
36501
7fdc639bc5b4 Merge ssize_t branch.
Martin v. Löwis <martin@v.loewis.de>
parents: 35999
diff changeset
398 PyAPI_FUNC(PyObject *) PyType_GenericAlloc(PyTypeObject *, Py_ssize_t);
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
399 PyAPI_FUNC(PyObject *) PyType_GenericNew(PyTypeObject *,
18933
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 17617
diff changeset
400 PyObject *, PyObject *);
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
401 PyAPI_FUNC(PyObject *) _PyType_Lookup(PyTypeObject *, PyObject *);
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
402
86
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents: 68
diff changeset
403 /* Generic operations on objects */
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
404 PyAPI_FUNC(int) PyObject_Print(PyObject *, FILE *, int);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
405 PyAPI_FUNC(void) _PyObject_Dump(PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
406 PyAPI_FUNC(PyObject *) PyObject_Repr(PyObject *);
35331
ef11cbc08dab Change the %s format specifier for str objects so that it returns a
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 33541
diff changeset
407 PyAPI_FUNC(PyObject *) _PyObject_Str(PyObject *);
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
408 PyAPI_FUNC(PyObject *) PyObject_Str(PyObject *);
19343
7257e87e0720 Patch #445762: Support --disable-unicode
Martin v. Löwis <martin@v.loewis.de>
parents: 19283
diff changeset
409 #ifdef Py_USING_UNICODE
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
410 PyAPI_FUNC(PyObject *) PyObject_Unicode(PyObject *);
19343
7257e87e0720 Patch #445762: Support --disable-unicode
Martin v. Löwis <martin@v.loewis.de>
parents: 19283
diff changeset
411 #endif
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
412 PyAPI_FUNC(int) PyObject_Compare(PyObject *, PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
413 PyAPI_FUNC(PyObject *) PyObject_RichCompare(PyObject *, PyObject *, int);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
414 PyAPI_FUNC(int) PyObject_RichCompareBool(PyObject *, PyObject *, int);
35999
9541369b0dca Add const to several API functions that take char *.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 35331
diff changeset
415 PyAPI_FUNC(PyObject *) PyObject_GetAttrString(PyObject *, const char *);
9541369b0dca Add const to several API functions that take char *.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 35331
diff changeset
416 PyAPI_FUNC(int) PyObject_SetAttrString(PyObject *, const char *, PyObject *);
9541369b0dca Add const to several API functions that take char *.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 35331
diff changeset
417 PyAPI_FUNC(int) PyObject_HasAttrString(PyObject *, const char *);
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
418 PyAPI_FUNC(PyObject *) PyObject_GetAttr(PyObject *, PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
419 PyAPI_FUNC(int) PyObject_SetAttr(PyObject *, PyObject *, PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
420 PyAPI_FUNC(int) PyObject_HasAttr(PyObject *, PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
421 PyAPI_FUNC(PyObject **) _PyObject_GetDictPtr(PyObject *);
28320
fd5ef7003469 Renamed PyObject_GenericGetIter to PyObject_SelfIter
Raymond Hettinger <python@rcn.com>
parents: 28308
diff changeset
422 PyAPI_FUNC(PyObject *) PyObject_SelfIter(PyObject *);
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
423 PyAPI_FUNC(PyObject *) PyObject_GenericGetAttr(PyObject *, PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
424 PyAPI_FUNC(int) PyObject_GenericSetAttr(PyObject *,
18933
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 17617
diff changeset
425 PyObject *, PyObject *);
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
426 PyAPI_FUNC(long) PyObject_Hash(PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
427 PyAPI_FUNC(int) PyObject_IsTrue(PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
428 PyAPI_FUNC(int) PyObject_Not(PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
429 PyAPI_FUNC(int) PyCallable_Check(PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
430 PyAPI_FUNC(int) PyNumber_Coerce(PyObject **, PyObject **);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
431 PyAPI_FUNC(int) PyNumber_CoerceEx(PyObject **, PyObject **);
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
432
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
433 PyAPI_FUNC(void) PyObject_ClearWeakRefs(PyObject *);
16385
1fb6672b20ef PEP 205, Weak References -- initial checkin.
Fred Drake <fdrake@acm.org>
parents: 16235
diff changeset
434
19970
f761cab28c1c Hopefully fix 3-way comparisons. This unfortunately adds yet another
Guido van Rossum <guido@python.org>
parents: 19705
diff changeset
435 /* A slot function whose address we need to compare */
f761cab28c1c Hopefully fix 3-way comparisons. This unfortunately adds yet another
Guido van Rossum <guido@python.org>
parents: 19705
diff changeset
436 extern int _PyObject_SlotCompare(PyObject *, PyObject *);
f761cab28c1c Hopefully fix 3-way comparisons. This unfortunately adds yet another
Guido van Rossum <guido@python.org>
parents: 19705
diff changeset
437
f761cab28c1c Hopefully fix 3-way comparisons. This unfortunately adds yet another
Guido van Rossum <guido@python.org>
parents: 19705
diff changeset
438
19705
b7f6fbc087a7 At Guido's suggestion, here's a new C API function, PyObject_Dir(), like
Tim Peters <tim.peters@gmail.com>
parents: 19576
diff changeset
439 /* PyObject_Dir(obj) acts like Python __builtin__.dir(obj), returning a
b7f6fbc087a7 At Guido's suggestion, here's a new C API function, PyObject_Dir(), like
Tim Peters <tim.peters@gmail.com>
parents: 19576
diff changeset
440 list of strings. PyObject_Dir(NULL) is like __builtin__.dir(),
b7f6fbc087a7 At Guido's suggestion, here's a new C API function, PyObject_Dir(), like
Tim Peters <tim.peters@gmail.com>
parents: 19576
diff changeset
441 returning the names of the current locals. In this case, if there are
b7f6fbc087a7 At Guido's suggestion, here's a new C API function, PyObject_Dir(), like
Tim Peters <tim.peters@gmail.com>
parents: 19576
diff changeset
442 no current locals, NULL is returned, and PyErr_Occurred() is false.
b7f6fbc087a7 At Guido's suggestion, here's a new C API function, PyObject_Dir(), like
Tim Peters <tim.peters@gmail.com>
parents: 19576
diff changeset
443 */
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
444 PyAPI_FUNC(PyObject *) PyObject_Dir(PyObject *);
19705
b7f6fbc087a7 At Guido's suggestion, here's a new C API function, PyObject_Dir(), like
Tim Peters <tim.peters@gmail.com>
parents: 19576
diff changeset
445
b7f6fbc087a7 At Guido's suggestion, here's a new C API function, PyObject_Dir(), like
Tim Peters <tim.peters@gmail.com>
parents: 19576
diff changeset
446
7983
068303f925ea Add prototypes for Py_Repr{Enter,Leave}.
Guido van Rossum <guido@python.org>
parents: 7935
diff changeset
447 /* Helpers for printing recursive container types */
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
448 PyAPI_FUNC(int) Py_ReprEnter(PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
449 PyAPI_FUNC(void) Py_ReprLeave(PyObject *);
7983
068303f925ea Add prototypes for Py_Repr{Enter,Leave}.
Guido van Rossum <guido@python.org>
parents: 7935
diff changeset
450
13141
cca84745da3e This patch addresses two main issues: (1) There exist some non-fatal
Fred Drake <fdrake@acm.org>
parents: 12993
diff changeset
451 /* Helpers for hash functions */
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
452 PyAPI_FUNC(long) _Py_HashDouble(double);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
453 PyAPI_FUNC(long) _Py_HashPointer(void*);
13141
cca84745da3e This patch addresses two main issues: (1) There exist some non-fatal
Fred Drake <fdrake@acm.org>
parents: 12993
diff changeset
454
16394
f700e6b8de1f Undo recent change that banned using import to bind a global, as per
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16385
diff changeset
455 /* Helper for passing objects to printf and the like */
f700e6b8de1f Undo recent change that banned using import to bind a global, as per
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16385
diff changeset
456 #define PyObject_REPR(obj) PyString_AS_STRING(PyObject_Repr(obj))
f700e6b8de1f Undo recent change that banned using import to bind a global, as per
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 16385
diff changeset
457
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
458 /* Flag bits for printing: */
2129
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2071
diff changeset
459 #define Py_PRINT_RAW 1 /* No string quotes etc. */
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
460
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
461 /*
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
462 `Type flags (tp_flags)
9304
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
463
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
464 These flags are used to extend the type structure in a backwards-compatible
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
465 fashion. Extensions can use the flags to indicate (and test) when a given
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
466 type structure contains a new feature. The Python core will use these when
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
467 introducing new functionality between major revisions (to avoid mid-version
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
468 changes in the PYTHON_API_VERSION).
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
469
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
470 Arbitration of the flag bit positions will need to be coordinated among
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
471 all extension writers who publically release their extensions (this will
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
472 be fewer than you might expect!)..
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
473
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
474 Python 1.5.2 introduced the bf_getcharbuffer slot into PyBufferProcs.
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
475
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
476 Type definitions should use Py_TPFLAGS_DEFAULT for their tp_flags value.
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
477
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
478 Code can use PyType_HasFeature(type_ob, flag_value) to test whether the
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
479 given type object has a specified feature.
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
480 */
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
481
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
482 /* PyBufferProcs contains bf_getcharbuffer */
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
483 #define Py_TPFLAGS_HAVE_GETCHARBUFFER (1L<<0)
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
484
11867
06104bcf06a6 Patch by Mozhe Zadka, for __contains__ (overloading 'in'). This adds
Guido van Rossum <guido@python.org>
parents: 11673
diff changeset
485 /* PySequenceMethods contains sq_contains */
06104bcf06a6 Patch by Mozhe Zadka, for __contains__ (overloading 'in'). This adds
Guido van Rossum <guido@python.org>
parents: 11673
diff changeset
486 #define Py_TPFLAGS_HAVE_SEQUENCE_IN (1L<<1)
06104bcf06a6 Patch by Mozhe Zadka, for __contains__ (overloading 'in'). This adds
Guido van Rossum <guido@python.org>
parents: 11673
diff changeset
487
19576
b67309407cfc Change the GC type flag since the API has changed. Allow types using
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 19470
diff changeset
488 /* This is here for backwards compatibility. Extensions that use the old GC
b67309407cfc Change the GC type flag since the API has changed. Allow types using
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 19470
diff changeset
489 * API will still compile but the objects will not be tracked by the GC. */
b67309407cfc Change the GC type flag since the API has changed. Allow types using
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 19470
diff changeset
490 #define Py_TPFLAGS_GC 0 /* used to be (1L<<2) */
12993
8f79c5b69e0a part 2 of Neil Schemenauer's GC patches:
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 12990
diff changeset
491
14162
27d7d89c774b The real suport for augmented assignment: new opcodes, new PyNumber and
Thomas Wouters <thomas@python.org>
parents: 13620
diff changeset
492 /* PySequenceMethods and PyNumberMethods contain in-place operators */
27d7d89c774b The real suport for augmented assignment: new opcodes, new PyNumber and
Thomas Wouters <thomas@python.org>
parents: 13620
diff changeset
493 #define Py_TPFLAGS_HAVE_INPLACEOPS (1L<<3)
27d7d89c774b The real suport for augmented assignment: new opcodes, new PyNumber and
Thomas Wouters <thomas@python.org>
parents: 13620
diff changeset
494
15716
362e53f43dd2 - Add nb_cmp slot for new style nubmers.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 14497
diff changeset
495 /* PyNumberMethods do their own coercion */
15938
8fd221aed357 Introduction to rich comparisons:
Guido van Rossum <guido@python.org>
parents: 15716
diff changeset
496 #define Py_TPFLAGS_CHECKTYPES (1L<<4)
15716
362e53f43dd2 - Add nb_cmp slot for new style nubmers.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 14497
diff changeset
497
17597
32e7d0898eab Iterators phase 1. This comprises:
Guido van Rossum <guido@python.org>
parents: 16768
diff changeset
498 /* tp_richcompare is defined */
16235
5c60184f7f52 Add a flag to indicate the presence of the tp_richcompare field, and
Guido van Rossum <guido@python.org>
parents: 16195
diff changeset
499 #define Py_TPFLAGS_HAVE_RICHCOMPARE (1L<<5)
5c60184f7f52 Add a flag to indicate the presence of the tp_richcompare field, and
Guido van Rossum <guido@python.org>
parents: 16195
diff changeset
500
16420
38204093d9c9 Use a type flag to determine the applicability of the tp_weaklistoffset
Fred Drake <fdrake@acm.org>
parents: 16394
diff changeset
501 /* Objects which are weakly referencable if their tp_weaklistoffset is >0 */
38204093d9c9 Use a type flag to determine the applicability of the tp_weaklistoffset
Fred Drake <fdrake@acm.org>
parents: 16394
diff changeset
502 #define Py_TPFLAGS_HAVE_WEAKREFS (1L<<6)
38204093d9c9 Use a type flag to determine the applicability of the tp_weaklistoffset
Fred Drake <fdrake@acm.org>
parents: 16394
diff changeset
503
17597
32e7d0898eab Iterators phase 1. This comprises:
Guido van Rossum <guido@python.org>
parents: 16768
diff changeset
504 /* tp_iter is defined */
32e7d0898eab Iterators phase 1. This comprises:
Guido van Rossum <guido@python.org>
parents: 16768
diff changeset
505 #define Py_TPFLAGS_HAVE_ITER (1L<<7)
32e7d0898eab Iterators phase 1. This comprises:
Guido van Rossum <guido@python.org>
parents: 16768
diff changeset
506
19051
f20727cc3d0f Implement PEP 238 in its (almost) full glory.
Guido van Rossum <guido@python.org>
parents: 19040
diff changeset
507 /* New members introduced by Python 2.2 exist */
18933
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 17617
diff changeset
508 #define Py_TPFLAGS_HAVE_CLASS (1L<<8)
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 17617
diff changeset
509
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 17617
diff changeset
510 /* Set if the type object is dynamically allocated */
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 17617
diff changeset
511 #define Py_TPFLAGS_HEAPTYPE (1L<<9)
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 17617
diff changeset
512
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 17617
diff changeset
513 /* Set if the type allows subclassing */
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 17617
diff changeset
514 #define Py_TPFLAGS_BASETYPE (1L<<10)
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 17617
diff changeset
515
19134
d98121930e70 Add new flags for PyType_Ready(): READY to explicitly indicate the
Guido van Rossum <guido@python.org>
parents: 19051
diff changeset
516 /* Set if the type is 'ready' -- fully initialized */
d98121930e70 Add new flags for PyType_Ready(): READY to explicitly indicate the
Guido van Rossum <guido@python.org>
parents: 19051
diff changeset
517 #define Py_TPFLAGS_READY (1L<<12)
d98121930e70 Add new flags for PyType_Ready(): READY to explicitly indicate the
Guido van Rossum <guido@python.org>
parents: 19051
diff changeset
518
d98121930e70 Add new flags for PyType_Ready(): READY to explicitly indicate the
Guido van Rossum <guido@python.org>
parents: 19051
diff changeset
519 /* Set while the type is being 'readied', to prevent recursive ready calls */
d98121930e70 Add new flags for PyType_Ready(): READY to explicitly indicate the
Guido van Rossum <guido@python.org>
parents: 19051
diff changeset
520 #define Py_TPFLAGS_READYING (1L<<13)
d98121930e70 Add new flags for PyType_Ready(): READY to explicitly indicate the
Guido van Rossum <guido@python.org>
parents: 19051
diff changeset
521
19576
b67309407cfc Change the GC type flag since the API has changed. Allow types using
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 19470
diff changeset
522 /* Objects support garbage collection (see objimp.h) */
b67309407cfc Change the GC type flag since the API has changed. Allow types using
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 19470
diff changeset
523 #define Py_TPFLAGS_HAVE_GC (1L<<14)
b67309407cfc Change the GC type flag since the API has changed. Allow types using
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 19470
diff changeset
524
36882
6a9c7165b17b Checking in the code for PEP 357.
Guido van Rossum <guido@python.org>
parents: 36837
diff changeset
525 /* These two bits are preserved for Stackless Python, next after this is 17 */
29184
9aa06cbd9cc1 Preserved one bit in type objects for Stackless.
Christian Tismer <tismer@stackless.com>
parents: 28653
diff changeset
526 #ifdef STACKLESS
29245
ca0c8137de84 After Raymond's remark, I changed the Stackless bits to
Christian Tismer <tismer@stackless.com>
parents: 29240
diff changeset
527 #define Py_TPFLAGS_HAVE_STACKLESS_EXTENSION (3L<<15)
29184
9aa06cbd9cc1 Preserved one bit in type objects for Stackless.
Christian Tismer <tismer@stackless.com>
parents: 28653
diff changeset
528 #else
29240
e721025cca09 Generalized my type flags structure extension without being specific about
Christian Tismer <tismer@stackless.com>
parents: 29184
diff changeset
529 #define Py_TPFLAGS_HAVE_STACKLESS_EXTENSION 0
29184
9aa06cbd9cc1 Preserved one bit in type objects for Stackless.
Christian Tismer <tismer@stackless.com>
parents: 28653
diff changeset
530 #endif
9aa06cbd9cc1 Preserved one bit in type objects for Stackless.
Christian Tismer <tismer@stackless.com>
parents: 28653
diff changeset
531
36882
6a9c7165b17b Checking in the code for PEP 357.
Guido van Rossum <guido@python.org>
parents: 36837
diff changeset
532 /* Objects support nb_index in PyNumberMethods */
6a9c7165b17b Checking in the code for PEP 357.
Guido van Rossum <guido@python.org>
parents: 36837
diff changeset
533 #define Py_TPFLAGS_HAVE_INDEX (1L<<17)
6a9c7165b17b Checking in the code for PEP 357.
Guido van Rossum <guido@python.org>
parents: 36837
diff changeset
534
44664
387d48c3a0b3 Re-apply patch #1700288 (first applied in r59931, rolled back in r59940)
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 44661
diff changeset
535 /* Objects support type attribute cache */
387d48c3a0b3 Re-apply patch #1700288 (first applied in r59931, rolled back in r59940)
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 44661
diff changeset
536 #define Py_TPFLAGS_HAVE_VERSION_TAG (1L<<18)
387d48c3a0b3 Re-apply patch #1700288 (first applied in r59931, rolled back in r59940)
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 44661
diff changeset
537 #define Py_TPFLAGS_VALID_VERSION_TAG (1L<<19)
387d48c3a0b3 Re-apply patch #1700288 (first applied in r59931, rolled back in r59940)
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 44661
diff changeset
538
40908
d01bd37bf5ce Variation of patch # 1624059 to speed up checking if an object is a subclass
Neal Norwitz <nnorwitz@gmail.com>
parents: 39463
diff changeset
539 /* These flags are used to determine if a type is a subclass. */
d01bd37bf5ce Variation of patch # 1624059 to speed up checking if an object is a subclass
Neal Norwitz <nnorwitz@gmail.com>
parents: 39463
diff changeset
540 #define Py_TPFLAGS_INT_SUBCLASS (1L<<23)
d01bd37bf5ce Variation of patch # 1624059 to speed up checking if an object is a subclass
Neal Norwitz <nnorwitz@gmail.com>
parents: 39463
diff changeset
541 #define Py_TPFLAGS_LONG_SUBCLASS (1L<<24)
d01bd37bf5ce Variation of patch # 1624059 to speed up checking if an object is a subclass
Neal Norwitz <nnorwitz@gmail.com>
parents: 39463
diff changeset
542 #define Py_TPFLAGS_LIST_SUBCLASS (1L<<25)
d01bd37bf5ce Variation of patch # 1624059 to speed up checking if an object is a subclass
Neal Norwitz <nnorwitz@gmail.com>
parents: 39463
diff changeset
543 #define Py_TPFLAGS_TUPLE_SUBCLASS (1L<<26)
d01bd37bf5ce Variation of patch # 1624059 to speed up checking if an object is a subclass
Neal Norwitz <nnorwitz@gmail.com>
parents: 39463
diff changeset
544 #define Py_TPFLAGS_STRING_SUBCLASS (1L<<27)
d01bd37bf5ce Variation of patch # 1624059 to speed up checking if an object is a subclass
Neal Norwitz <nnorwitz@gmail.com>
parents: 39463
diff changeset
545 #define Py_TPFLAGS_UNICODE_SUBCLASS (1L<<28)
d01bd37bf5ce Variation of patch # 1624059 to speed up checking if an object is a subclass
Neal Norwitz <nnorwitz@gmail.com>
parents: 39463
diff changeset
546 #define Py_TPFLAGS_DICT_SUBCLASS (1L<<29)
d01bd37bf5ce Variation of patch # 1624059 to speed up checking if an object is a subclass
Neal Norwitz <nnorwitz@gmail.com>
parents: 39463
diff changeset
547 #define Py_TPFLAGS_BASE_EXC_SUBCLASS (1L<<30)
d01bd37bf5ce Variation of patch # 1624059 to speed up checking if an object is a subclass
Neal Norwitz <nnorwitz@gmail.com>
parents: 39463
diff changeset
548 #define Py_TPFLAGS_TYPE_SUBCLASS (1L<<31)
d01bd37bf5ce Variation of patch # 1624059 to speed up checking if an object is a subclass
Neal Norwitz <nnorwitz@gmail.com>
parents: 39463
diff changeset
549
16235
5c60184f7f52 Add a flag to indicate the presence of the tp_richcompare field, and
Guido van Rossum <guido@python.org>
parents: 16195
diff changeset
550 #define Py_TPFLAGS_DEFAULT ( \
5c60184f7f52 Add a flag to indicate the presence of the tp_richcompare field, and
Guido van Rossum <guido@python.org>
parents: 16195
diff changeset
551 Py_TPFLAGS_HAVE_GETCHARBUFFER | \
14162
27d7d89c774b The real suport for augmented assignment: new opcodes, new PyNumber and
Thomas Wouters <thomas@python.org>
parents: 13620
diff changeset
552 Py_TPFLAGS_HAVE_SEQUENCE_IN | \
16235
5c60184f7f52 Add a flag to indicate the presence of the tp_richcompare field, and
Guido van Rossum <guido@python.org>
parents: 16195
diff changeset
553 Py_TPFLAGS_HAVE_INPLACEOPS | \
5c60184f7f52 Add a flag to indicate the presence of the tp_richcompare field, and
Guido van Rossum <guido@python.org>
parents: 16195
diff changeset
554 Py_TPFLAGS_HAVE_RICHCOMPARE | \
16420
38204093d9c9 Use a type flag to determine the applicability of the tp_weaklistoffset
Fred Drake <fdrake@acm.org>
parents: 16394
diff changeset
555 Py_TPFLAGS_HAVE_WEAKREFS | \
17597
32e7d0898eab Iterators phase 1. This comprises:
Guido van Rossum <guido@python.org>
parents: 16768
diff changeset
556 Py_TPFLAGS_HAVE_ITER | \
18933
09df3254b49d Merge of descr-branch back into trunk.
Tim Peters <tim.peters@gmail.com>
parents: 17617
diff changeset
557 Py_TPFLAGS_HAVE_CLASS | \
29240
e721025cca09 Generalized my type flags structure extension without being specific about
Christian Tismer <tismer@stackless.com>
parents: 29184
diff changeset
558 Py_TPFLAGS_HAVE_STACKLESS_EXTENSION | \
36882
6a9c7165b17b Checking in the code for PEP 357.
Guido van Rossum <guido@python.org>
parents: 36837
diff changeset
559 Py_TPFLAGS_HAVE_INDEX | \
44664
387d48c3a0b3 Re-apply patch #1700288 (first applied in r59931, rolled back in r59940)
Amaury Forgeot d'Arc <amauryfa@gmail.com>
parents: 44661
diff changeset
560 Py_TPFLAGS_HAVE_VERSION_TAG | \
16235
5c60184f7f52 Add a flag to indicate the presence of the tp_richcompare field, and
Guido van Rossum <guido@python.org>
parents: 16195
diff changeset
561 0)
9304
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
562
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
563 #define PyType_HasFeature(t,f) (((t)->tp_flags & (f)) != 0)
40908
d01bd37bf5ce Variation of patch # 1624059 to speed up checking if an object is a subclass
Neal Norwitz <nnorwitz@gmail.com>
parents: 39463
diff changeset
564 #define PyType_FastSubclass(t,f) PyType_HasFeature(t,f)
9304
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
565
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
566
cc3e14837379 Changes by Greg Stein (code) and GvR (design).
Guido van Rossum <guido@python.org>
parents: 8124
diff changeset
567 /*
2129
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2071
diff changeset
568 The macros Py_INCREF(op) and Py_DECREF(op) are used to increment or decrement
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
569 reference counts. Py_DECREF calls the object's deallocator function when
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
570 the refcount falls to 0; for
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
571 objects that don't contain references to other objects or heap memory
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
572 this can be the standard function free(). Both macros can be used
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
573 wherever a void expression is allowed. The argument must not be a
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
574 NIL pointer. If it may be NIL, use Py_XINCREF/Py_XDECREF instead.
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
575 The macro _Py_NewReference(op) initialize reference counts to 1, and
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
576 in special builds (Py_REF_DEBUG, Py_TRACE_REFS) performs additional
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
577 bookkeeping appropriate to the special build.
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
578
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
579 We assume that the reference count field can never overflow; this can
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
580 be proven when the size of the field is the same as the pointer size, so
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
581 we ignore the possibility. Provided a C int is at least 32 bits (which
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
582 is implicitly assumed in many parts of this code), that's enough for
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
583 about 2**31 references to an object.
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
584
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
585 XXX The following became out of date in Python 2.2, but I'm not sure
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
586 XXX what the full truth is now. Certainly, heap-allocated type objects
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
587 XXX can and should be deallocated.
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
588 Type objects should never be deallocated; the type pointer in an object
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
589 is not considered to be a reference to the type object, to save
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
590 complications in the deallocation function. (This is actually a
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
591 decision that's up to the implementer of each new type so if you want,
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
592 you can count such references to the type object.)
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
593
2129
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2071
diff changeset
594 *** WARNING*** The Py_DECREF macro must have a side-effect-free argument
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
595 since it may evaluate its argument multiple times. (The alternative
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
596 would be to mace it a proper function or assign it to a global temporary
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
597 variable first, both of which are slower; and in a multi-threaded
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
598 environment the global variable trick is not safe.)
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
599 */
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
600
24184
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
601 /* First define a pile of simple helper macros, one set per special
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
602 * build symbol. These either expand to the obvious things, or to
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
603 * nothing at all when the special mode isn't in effect. The main
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
604 * macros can later be defined just once then, yet expand to different
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
605 * things depending on which special build options are and aren't in effect.
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
606 * Trust me <wink>: while painful, this is 20x easier to understand than,
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
607 * e.g, defining _Py_NewReference five different times in a maze of nested
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
608 * #ifdefs (we used to do that -- it was impenetrable).
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
609 */
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
610 #ifdef Py_REF_DEBUG
36837
3a3aed49b245 Use Py_ssize_t for _Py_RefTotal.
Neal Norwitz <nnorwitz@gmail.com>
parents: 36748
diff changeset
611 PyAPI_DATA(Py_ssize_t) _Py_RefTotal;
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
612 PyAPI_FUNC(void) _Py_NegativeRefcount(const char *fname,
24155
9456a2ccda61 The Py_REF_DEBUG/COUNT_ALLOCS/Py_TRACE_REFS macro minefield: added
Tim Peters <tim.peters@gmail.com>
parents: 24126
diff changeset
613 int lineno, PyObject *op);
37638
65ecb83ea7dd Ignore the references to the dummy objects used as deleted keys
Armin Rigo <arigo@tunes.org>
parents: 36882
diff changeset
614 PyAPI_FUNC(PyObject *) _PyDict_Dummy(void);
65ecb83ea7dd Ignore the references to the dummy objects used as deleted keys
Armin Rigo <arigo@tunes.org>
parents: 36882
diff changeset
615 PyAPI_FUNC(PyObject *) _PySet_Dummy(void);
65ecb83ea7dd Ignore the references to the dummy objects used as deleted keys
Armin Rigo <arigo@tunes.org>
parents: 36882
diff changeset
616 PyAPI_FUNC(Py_ssize_t) _Py_GetRefTotal(void);
24184
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
617 #define _Py_INC_REFTOTAL _Py_RefTotal++
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
618 #define _Py_DEC_REFTOTAL _Py_RefTotal--
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
619 #define _Py_REF_DEBUG_COMMA ,
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
620 #define _Py_CHECK_REFCNT(OP) \
42333
6620a510e9a9 PEP 3123: Provide forward compatibility with Python 3.0, while keeping
Martin v. Löwis <martin@v.loewis.de>
parents: 40908
diff changeset
621 { if (((PyObject*)OP)->ob_refcnt < 0) \
24155
9456a2ccda61 The Py_REF_DEBUG/COUNT_ALLOCS/Py_TRACE_REFS macro minefield: added
Tim Peters <tim.peters@gmail.com>
parents: 24126
diff changeset
622 _Py_NegativeRefcount(__FILE__, __LINE__, \
9456a2ccda61 The Py_REF_DEBUG/COUNT_ALLOCS/Py_TRACE_REFS macro minefield: added
Tim Peters <tim.peters@gmail.com>
parents: 24126
diff changeset
623 (PyObject *)(OP)); \
9456a2ccda61 The Py_REF_DEBUG/COUNT_ALLOCS/Py_TRACE_REFS macro minefield: added
Tim Peters <tim.peters@gmail.com>
parents: 24126
diff changeset
624 }
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
625 #else
24184
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
626 #define _Py_INC_REFTOTAL
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
627 #define _Py_DEC_REFTOTAL
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
628 #define _Py_REF_DEBUG_COMMA
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
629 #define _Py_CHECK_REFCNT(OP) /* a semicolon */;
24171
5e4b8d1e9fd6 Uglified the new Py_REF_DEBUG (etc) lexical helper macro definitions so
Tim Peters <tim.peters@gmail.com>
parents: 24155
diff changeset
630 #endif /* Py_REF_DEBUG */
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
631
1347
a22a350d3a5d * Extended X interface: pixmap objects, colormap objects visual objects,
Sjoerd Mullender <sjoerd@acm.org>
parents: 1329
diff changeset
632 #ifdef COUNT_ALLOCS
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
633 PyAPI_FUNC(void) inc_count(PyTypeObject *);
37831
d82dced6f1fa Remove types from type_list if they have no objects
Martin v. Löwis <martin@v.loewis.de>
parents: 37726
diff changeset
634 PyAPI_FUNC(void) dec_count(PyTypeObject *);
44350
26384b8180c7 #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE, Py_TYPE and Py_REFCNT. Macros for b/w compatibility are available.
Christian Heimes <christian@cheimes.de>
parents: 42333
diff changeset
635 #define _Py_INC_TPALLOCS(OP) inc_count(Py_TYPE(OP))
26384b8180c7 #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE, Py_TYPE and Py_REFCNT. Macros for b/w compatibility are available.
Christian Heimes <christian@cheimes.de>
parents: 42333
diff changeset
636 #define _Py_INC_TPFREES(OP) dec_count(Py_TYPE(OP))
26384b8180c7 #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE, Py_TYPE and Py_REFCNT. Macros for b/w compatibility are available.
Christian Heimes <christian@cheimes.de>
parents: 42333
diff changeset
637 #define _Py_DEC_TPFREES(OP) Py_TYPE(OP)->tp_frees--
24184
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
638 #define _Py_COUNT_ALLOCS_COMMA ,
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
639 #else
24184
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
640 #define _Py_INC_TPALLOCS(OP)
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
641 #define _Py_INC_TPFREES(OP)
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
642 #define _Py_DEC_TPFREES(OP)
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
643 #define _Py_COUNT_ALLOCS_COMMA
24171
5e4b8d1e9fd6 Uglified the new Py_REF_DEBUG (etc) lexical helper macro definitions so
Tim Peters <tim.peters@gmail.com>
parents: 24155
diff changeset
644 #endif /* COUNT_ALLOCS */
1347
a22a350d3a5d * Extended X interface: pixmap objects, colormap objects visual objects,
Sjoerd Mullender <sjoerd@acm.org>
parents: 1329
diff changeset
645
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
646 #ifdef Py_TRACE_REFS
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
647 /* Py_TRACE_REFS is such major surgery that we call external routines. */
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
648 PyAPI_FUNC(void) _Py_NewReference(PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
649 PyAPI_FUNC(void) _Py_ForgetReference(PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
650 PyAPI_FUNC(void) _Py_Dealloc(PyObject *);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
651 PyAPI_FUNC(void) _Py_PrintReferences(FILE *);
28653
56006d97bcef _Py_PrintReferences(): Changed to print object address at start of each
Tim Peters <tim.peters@gmail.com>
parents: 28396
diff changeset
652 PyAPI_FUNC(void) _Py_PrintReferenceAddresses(FILE *);
28396
d56282c28a1e Improved new Py_TRACE_REFS gimmicks.
Tim Peters <tim.peters@gmail.com>
parents: 28389
diff changeset
653 PyAPI_FUNC(void) _Py_AddToAllObjects(PyObject *, int force);
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
654
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
655 #else
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
656 /* Without Py_TRACE_REFS, there's little enough to do that we expand code
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
657 * inline.
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
658 */
24184
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
659 #define _Py_NewReference(op) ( \
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
660 _Py_INC_TPALLOCS(op) _Py_COUNT_ALLOCS_COMMA \
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
661 _Py_INC_REFTOTAL _Py_REF_DEBUG_COMMA \
44350
26384b8180c7 #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE, Py_TYPE and Py_REFCNT. Macros for b/w compatibility are available.
Christian Heimes <christian@cheimes.de>
parents: 42333
diff changeset
662 Py_REFCNT(op) = 1)
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
663
24184
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
664 #define _Py_ForgetReference(op) _Py_INC_TPFREES(op)
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
665
24171
5e4b8d1e9fd6 Uglified the new Py_REF_DEBUG (etc) lexical helper macro definitions so
Tim Peters <tim.peters@gmail.com>
parents: 24155
diff changeset
666 #define _Py_Dealloc(op) ( \
24184
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
667 _Py_INC_TPFREES(op) _Py_COUNT_ALLOCS_COMMA \
44350
26384b8180c7 #1629: Renamed Py_Size, Py_Type and Py_Refcnt to Py_SIZE, Py_TYPE and Py_REFCNT. Macros for b/w compatibility are available.
Christian Heimes <christian@cheimes.de>
parents: 42333
diff changeset
668 (*Py_TYPE(op)->tp_dealloc)((PyObject *)(op)))
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
669 #endif /* !Py_TRACE_REFS */
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
670
24184
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
671 #define Py_INCREF(op) ( \
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
672 _Py_INC_REFTOTAL _Py_REF_DEBUG_COMMA \
42333
6620a510e9a9 PEP 3123: Provide forward compatibility with Python 3.0, while keeping
Martin v. Löwis <martin@v.loewis.de>
parents: 40908
diff changeset
673 ((PyObject*)(op))->ob_refcnt++)
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
674
24184
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
675 #define Py_DECREF(op) \
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
676 if (_Py_DEC_REFTOTAL _Py_REF_DEBUG_COMMA \
42333
6620a510e9a9 PEP 3123: Provide forward compatibility with Python 3.0, while keeping
Martin v. Löwis <martin@v.loewis.de>
parents: 40908
diff changeset
677 --((PyObject*)(op))->ob_refcnt != 0) \
24184
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
678 _Py_CHECK_REFCNT(op) \
c4dcb80f48ea object.h special-build macro minefield: renamed all the new lexical
Tim Peters <tim.peters@gmail.com>
parents: 24171
diff changeset
679 else \
5943
ac877c4768e1 Add a cast to the call to _Py_Dealloc in the expanded version of
Guido van Rossum <guido@python.org>
parents: 5535
diff changeset
680 _Py_Dealloc((PyObject *)(op))
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
681
37726
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
682 /* Safely decref `op` and set `op` to NULL, especially useful in tp_clear
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
683 * and tp_dealloc implementatons.
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
684 *
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
685 * Note that "the obvious" code can be deadly:
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
686 *
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
687 * Py_XDECREF(op);
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
688 * op = NULL;
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
689 *
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
690 * Typically, `op` is something like self->containee, and `self` is done
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
691 * using its `containee` member. In the code sequence above, suppose
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
692 * `containee` is non-NULL with a refcount of 1. Its refcount falls to
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
693 * 0 on the first line, which can trigger an arbitrary amount of code,
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
694 * possibly including finalizers (like __del__ methods or weakref callbacks)
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
695 * coded in Python, which in turn can release the GIL and allow other threads
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
696 * to run, etc. Such code may even invoke methods of `self` again, or cause
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
697 * cyclic gc to trigger, but-- oops! --self->containee still points to the
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
698 * object being torn down, and it may be in an insane state while being torn
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
699 * down. This has in fact been a rich historic source of miserable (rare &
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
700 * hard-to-diagnose) segfaulting (and other) bugs.
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
701 *
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
702 * The safe way is:
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
703 *
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
704 * Py_CLEAR(op);
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
705 *
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
706 * That arranges to set `op` to NULL _before_ decref'ing, so that any code
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
707 * triggered as a side-effect of `op` getting torn down no longer believes
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
708 * `op` points to a valid object.
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
709 *
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
710 * There are cases where it's safe to use the naive code, but they're brittle.
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
711 * For example, if `op` points to a Python integer, you know that destroying
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
712 * one of those can't cause problems -- but in part that relies on that
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
713 * Python integers aren't currently weakly referencable. Best practice is
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
714 * to use Py_CLEAR() even if you can't think of a reason for why you need to.
27a639c4471a There were no comments explaining what Py_CLEAR() did or
Tim Peters <tim.peters@gmail.com>
parents: 37638
diff changeset
715 */
32670
a1a9776fab53 Implemented a new Py_CLEAR macro. This macro should be used when
Jim Fulton <jim@zope.com>
parents: 31940
diff changeset
716 #define Py_CLEAR(op) \
a1a9776fab53 Implemented a new Py_CLEAR macro. This macro should be used when
Jim Fulton <jim@zope.com>
parents: 31940
diff changeset
717 do { \
a1a9776fab53 Implemented a new Py_CLEAR macro. This macro should be used when
Jim Fulton <jim@zope.com>
parents: 31940
diff changeset
718 if (op) { \
33386
c2c49ee727d0 SF patch #1020188: Use Py_CLEAR where necessary to avoid crashes
Raymond Hettinger <python@rcn.com>
parents: 32793
diff changeset
719 PyObject *tmp = (PyObject *)(op); \
32670
a1a9776fab53 Implemented a new Py_CLEAR macro. This macro should be used when
Jim Fulton <jim@zope.com>
parents: 31940
diff changeset
720 (op) = NULL; \
a1a9776fab53 Implemented a new Py_CLEAR macro. This macro should be used when
Jim Fulton <jim@zope.com>
parents: 31940
diff changeset
721 Py_DECREF(tmp); \
a1a9776fab53 Implemented a new Py_CLEAR macro. This macro should be used when
Jim Fulton <jim@zope.com>
parents: 31940
diff changeset
722 } \
a1a9776fab53 Implemented a new Py_CLEAR macro. This macro should be used when
Jim Fulton <jim@zope.com>
parents: 31940
diff changeset
723 } while (0)
a1a9776fab53 Implemented a new Py_CLEAR macro. This macro should be used when
Jim Fulton <jim@zope.com>
parents: 31940
diff changeset
724
86
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents: 68
diff changeset
725 /* Macros to use in case the object pointer may be NULL: */
2129
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2071
diff changeset
726 #define Py_XINCREF(op) if ((op) == NULL) ; else Py_INCREF(op)
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2071
diff changeset
727 #define Py_XDECREF(op) if ((op) == NULL) ; else Py_DECREF(op)
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
728
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
729 /*
31940
059740d52ae5 Two new public API functions, Py_IncRef and Py_DecRef. Useful for
Thomas Heller <theller@ctypes.org>
parents: 30887
diff changeset
730 These are provided as conveniences to Python runtime embedders, so that
059740d52ae5 Two new public API functions, Py_IncRef and Py_DecRef. Useful for
Thomas Heller <theller@ctypes.org>
parents: 30887
diff changeset
731 they can have object code that is not dependent on Python compilation flags.
059740d52ae5 Two new public API functions, Py_IncRef and Py_DecRef. Useful for
Thomas Heller <theller@ctypes.org>
parents: 30887
diff changeset
732 */
059740d52ae5 Two new public API functions, Py_IncRef and Py_DecRef. Useful for
Thomas Heller <theller@ctypes.org>
parents: 30887
diff changeset
733 PyAPI_FUNC(void) Py_IncRef(PyObject *);
059740d52ae5 Two new public API functions, Py_IncRef and Py_DecRef. Useful for
Thomas Heller <theller@ctypes.org>
parents: 30887
diff changeset
734 PyAPI_FUNC(void) Py_DecRef(PyObject *);
059740d52ae5 Two new public API functions, Py_IncRef and Py_DecRef. Useful for
Thomas Heller <theller@ctypes.org>
parents: 30887
diff changeset
735
059740d52ae5 Two new public API functions, Py_IncRef and Py_DecRef. Useful for
Thomas Heller <theller@ctypes.org>
parents: 30887
diff changeset
736 /*
2129
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2071
diff changeset
737 _Py_NoneStruct is an object of undefined type which can be used in contexts
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
738 where NULL (nil) is not suitable (since NULL often means 'error').
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
739
2129
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2071
diff changeset
740 Don't forget to apply Py_INCREF() when returning this value!!!
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
741 */
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
742 PyAPI_DATA(PyObject) _Py_NoneStruct; /* Don't use this directly */
2129
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2071
diff changeset
743 #define Py_None (&_Py_NoneStruct)
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
744
30719
7dfdf9e8d95d Defined macros Py_RETURN_(TRUE|FALSE|NONE) as helper functions for returning
Brett Cannon <bcannon@gmail.com>
parents: 29245
diff changeset
745 /* Macro for returning Py_None from a function */
32793
1e2187f50631 SF bug 994255: Py_RETURN_NONE causes too much warnings
Tim Peters <tim.peters@gmail.com>
parents: 32670
diff changeset
746 #define Py_RETURN_NONE return Py_INCREF(Py_None), Py_None
30719
7dfdf9e8d95d Defined macros Py_RETURN_(TRUE|FALSE|NONE) as helper functions for returning
Brett Cannon <bcannon@gmail.com>
parents: 29245
diff changeset
747
15716
362e53f43dd2 - Add nb_cmp slot for new style nubmers.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 14497
diff changeset
748 /*
362e53f43dd2 - Add nb_cmp slot for new style nubmers.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 14497
diff changeset
749 Py_NotImplemented is a singleton used to signal that an operation is
362e53f43dd2 - Add nb_cmp slot for new style nubmers.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 14497
diff changeset
750 not implemented for a given type combination.
362e53f43dd2 - Add nb_cmp slot for new style nubmers.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 14497
diff changeset
751 */
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
752 PyAPI_DATA(PyObject) _Py_NotImplementedStruct; /* Don't use this directly */
15716
362e53f43dd2 - Add nb_cmp slot for new style nubmers.
Neil Schemenauer <nascheme@enme.ucalgary.ca>
parents: 14497
diff changeset
753 #define Py_NotImplemented (&_Py_NotImplementedStruct)
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
754
15938
8fd221aed357 Introduction to rich comparisons:
Guido van Rossum <guido@python.org>
parents: 15716
diff changeset
755 /* Rich comparison opcodes */
8fd221aed357 Introduction to rich comparisons:
Guido van Rossum <guido@python.org>
parents: 15716
diff changeset
756 #define Py_LT 0
8fd221aed357 Introduction to rich comparisons:
Guido van Rossum <guido@python.org>
parents: 15716
diff changeset
757 #define Py_LE 1
8fd221aed357 Introduction to rich comparisons:
Guido van Rossum <guido@python.org>
parents: 15716
diff changeset
758 #define Py_EQ 2
8fd221aed357 Introduction to rich comparisons:
Guido van Rossum <guido@python.org>
parents: 15716
diff changeset
759 #define Py_NE 3
8fd221aed357 Introduction to rich comparisons:
Guido van Rossum <guido@python.org>
parents: 15716
diff changeset
760 #define Py_GT 4
8fd221aed357 Introduction to rich comparisons:
Guido van Rossum <guido@python.org>
parents: 15716
diff changeset
761 #define Py_GE 5
8fd221aed357 Introduction to rich comparisons:
Guido van Rossum <guido@python.org>
parents: 15716
diff changeset
762
33541
781aef974463 A static swapped_op[] array was defined in 3 different C files, & I think
Tim Peters <tim.peters@gmail.com>
parents: 33386
diff changeset
763 /* Maps Py_LT to Py_GT, ..., Py_GE to Py_LE.
781aef974463 A static swapped_op[] array was defined in 3 different C files, & I think
Tim Peters <tim.peters@gmail.com>
parents: 33386
diff changeset
764 * Defined in object.c.
781aef974463 A static swapped_op[] array was defined in 3 different C files, & I think
Tim Peters <tim.peters@gmail.com>
parents: 33386
diff changeset
765 */
781aef974463 A static swapped_op[] array was defined in 3 different C files, & I think
Tim Peters <tim.peters@gmail.com>
parents: 33386
diff changeset
766 PyAPI_DATA(int) _Py_SwappedOp[];
781aef974463 A static swapped_op[] array was defined in 3 different C files, & I think
Tim Peters <tim.peters@gmail.com>
parents: 33386
diff changeset
767
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
768 /*
24280
1598a1e473e2 staticforward bites the dust.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 24184
diff changeset
769 Define staticforward and statichere for source compatibility with old
1598a1e473e2 staticforward bites the dust.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 24184
diff changeset
770 C extensions.
1598a1e473e2 staticforward bites the dust.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 24184
diff changeset
771
1598a1e473e2 staticforward bites the dust.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 24184
diff changeset
772 The staticforward define was needed to support certain broken C
1598a1e473e2 staticforward bites the dust.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 24184
diff changeset
773 compilers (notably SCO ODT 3.0, perhaps early AIX as well) botched the
1598a1e473e2 staticforward bites the dust.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 24184
diff changeset
774 static keyword when it was used with a forward declaration of a static
1598a1e473e2 staticforward bites the dust.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 24184
diff changeset
775 initialized structure. Standard C allows the forward declaration with
1598a1e473e2 staticforward bites the dust.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 24184
diff changeset
776 static, and we've decided to stop catering to broken C compilers.
1598a1e473e2 staticforward bites the dust.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 24184
diff changeset
777 (In fact, we expect that the compilers are all fixed eight years later.)
1746
1940892d2fe3 Merge alpha100 branch back to main trunk
Guido van Rossum <guido@python.org>
parents: 1400
diff changeset
778 */
1940892d2fe3 Merge alpha100 branch back to main trunk
Guido van Rossum <guido@python.org>
parents: 1400
diff changeset
779
1940892d2fe3 Merge alpha100 branch back to main trunk
Guido van Rossum <guido@python.org>
parents: 1400
diff changeset
780 #define staticforward static
2422
f4f71ebea53f change in staticforward -- added statichere
Guido van Rossum <guido@python.org>
parents: 2364
diff changeset
781 #define statichere static
1746
1940892d2fe3 Merge alpha100 branch back to main trunk
Guido van Rossum <guido@python.org>
parents: 1400
diff changeset
782
1940892d2fe3 Merge alpha100 branch back to main trunk
Guido van Rossum <guido@python.org>
parents: 1400
diff changeset
783
1940892d2fe3 Merge alpha100 branch back to main trunk
Guido van Rossum <guido@python.org>
parents: 1400
diff changeset
784 /*
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
785 More conventions
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
786 ================
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
787
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
788 Argument Checking
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
789 -----------------
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
790
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
791 Functions that take objects as arguments normally don't check for nil
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
792 arguments, but they do check the type of the argument, and return an
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
793 error if the function doesn't apply to the type.
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
794
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
795 Failure Modes
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
796 -------------
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
797
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
798 Functions may fail for a variety of reasons, including running out of
86
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents: 68
diff changeset
799 memory. This is communicated to the caller in two ways: an error string
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents: 68
diff changeset
800 is set (see errors.h), and the function result differs: functions that
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents: 68
diff changeset
801 normally return a pointer return NULL for failure, functions returning
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents: 68
diff changeset
802 an integer return -1 (which could be a legal return value too!), and
a6934380c6e7 "Compiling" version
Guido van Rossum <guido@python.org>
parents: 68
diff changeset
803 other functions return 0 for success and -1 for failure.
24126
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
804 Callers should always check for errors before using the result. If
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
805 an error was set, the caller must either explicitly clear it, or pass
fdf80e04e4bb Rearranged and added comments to object.h, to clarify many things
Tim Peters <tim.peters@gmail.com>
parents: 24122
diff changeset
806 the error on to its caller.
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
807
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
808 Reference Counts
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
809 ----------------
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
810
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
811 It takes a while to get used to the proper usage of reference counts.
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
812
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
813 Functions that create an object set the reference count to 1; such new
2129
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2071
diff changeset
814 objects must be stored somewhere or destroyed again with Py_DECREF().
30887
3ae82928b113 fixed buggy comment as per SF bug #827856
Alex Martelli <aleaxit@gmail.com>
parents: 30721
diff changeset
815 Some functions that 'store' objects, such as PyTuple_SetItem() and
3ae82928b113 fixed buggy comment as per SF bug #827856
Alex Martelli <aleaxit@gmail.com>
parents: 30721
diff changeset
816 PyList_SetItem(),
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
817 don't increment the reference count of the object, since the most
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
818 frequent use is to store a fresh object. Functions that 'retrieve'
30887
3ae82928b113 fixed buggy comment as per SF bug #827856
Alex Martelli <aleaxit@gmail.com>
parents: 30721
diff changeset
819 objects, such as PyTuple_GetItem() and PyDict_GetItemString(), also
2129
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2071
diff changeset
820 don't increment
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
821 the reference count, since most frequently the object is only looked at
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
822 quickly. Thus, to retrieve an object and store it again, the caller
2129
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2071
diff changeset
823 must call Py_INCREF() explicitly.
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
824
30887
3ae82928b113 fixed buggy comment as per SF bug #827856
Alex Martelli <aleaxit@gmail.com>
parents: 30721
diff changeset
825 NOTE: functions that 'consume' a reference count, like
3ae82928b113 fixed buggy comment as per SF bug #827856
Alex Martelli <aleaxit@gmail.com>
parents: 30721
diff changeset
826 PyList_SetItem(), consume the reference even if the object wasn't
3ae82928b113 fixed buggy comment as per SF bug #827856
Alex Martelli <aleaxit@gmail.com>
parents: 30721
diff changeset
827 successfully stored, to simplify error handling.
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
828
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
829 It seems attractive to make other functions that take an object as
30887
3ae82928b113 fixed buggy comment as per SF bug #827856
Alex Martelli <aleaxit@gmail.com>
parents: 30721
diff changeset
830 argument consume a reference count; however, this may quickly get
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
831 confusing (even the current practice is already confusing). Consider
2129
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2071
diff changeset
832 it carefully, it may save lots of calls to Py_INCREF() and Py_DECREF() at
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
833 times.
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
834 */
1329
519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1324
diff changeset
835
24122
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
836
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
837 /* Trashcan mechanism, thanks to Christian Tismer.
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
838
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
839 When deallocating a container object, it's possible to trigger an unbounded
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
840 chain of deallocations, as each Py_DECREF in turn drops the refcount on "the
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
841 next" object in the chain to 0. This can easily lead to stack faults, and
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
842 especially in threads (which typically have less stack space to work with).
11999
c94247b5c355 Christian Tismer's "trashcan" patch:
Guido van Rossum <guido@python.org>
parents: 11891
diff changeset
843
24122
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
844 A container object that participates in cyclic gc can avoid this by
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
845 bracketing the body of its tp_dealloc function with a pair of macros:
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
846
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
847 static void
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
848 mytype_dealloc(mytype *p)
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
849 {
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
850 ... declarations go here ...
11999
c94247b5c355 Christian Tismer's "trashcan" patch:
Guido van Rossum <guido@python.org>
parents: 11891
diff changeset
851
24122
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
852 PyObject_GC_UnTrack(p); // must untrack first
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
853 Py_TRASHCAN_SAFE_BEGIN(p)
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
854 ... The body of the deallocator goes here, including all calls ...
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
855 ... to Py_DECREF on contained objects. ...
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
856 Py_TRASHCAN_SAFE_END(p)
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
857 }
11999
c94247b5c355 Christian Tismer's "trashcan" patch:
Guido van Rossum <guido@python.org>
parents: 11891
diff changeset
858
24654
f672e1dbad92 Added info about the right way to leave the body of a trashcan-protected
Tim Peters <tim.peters@gmail.com>
parents: 24420
diff changeset
859 CAUTION: Never return from the middle of the body! If the body needs to
f672e1dbad92 Added info about the right way to leave the body of a trashcan-protected
Tim Peters <tim.peters@gmail.com>
parents: 24420
diff changeset
860 "get out early", put a label immediately before the Py_TRASHCAN_SAFE_END
f672e1dbad92 Added info about the right way to leave the body of a trashcan-protected
Tim Peters <tim.peters@gmail.com>
parents: 24420
diff changeset
861 call, and goto it. Else the call-depth counter (see below) will stay
f672e1dbad92 Added info about the right way to leave the body of a trashcan-protected
Tim Peters <tim.peters@gmail.com>
parents: 24420
diff changeset
862 above 0 forever, and the trashcan will never get emptied.
f672e1dbad92 Added info about the right way to leave the body of a trashcan-protected
Tim Peters <tim.peters@gmail.com>
parents: 24420
diff changeset
863
24122
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
864 How it works: The BEGIN macro increments a call-depth counter. So long
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
865 as this counter is small, the body of the deallocator is run directly without
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
866 further ado. But if the counter gets large, it instead adds p to a list of
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
867 objects to be deallocated later, skips the body of the deallocator, and
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
868 resumes execution after the END macro. The tp_dealloc routine then returns
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
869 without deallocating anything (and so unbounded call-stack depth is avoided).
12481
a8898a172fe2 Christian Tismer -- total rewrite on trashcan code.
Guido van Rossum <guido@python.org>
parents: 12406
diff changeset
870
24122
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
871 When the call stack finishes unwinding again, code generated by the END macro
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
872 notices this, and calls another routine to deallocate all the objects that
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
873 may have been added to the list of deferred deallocations. In effect, a
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
874 chain of N deallocations is broken into N / PyTrash_UNWIND_LEVEL pieces,
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
875 with the call stack never exceeding a depth of PyTrash_UNWIND_LEVEL.
11999
c94247b5c355 Christian Tismer's "trashcan" patch:
Guido van Rossum <guido@python.org>
parents: 11891
diff changeset
876 */
c94247b5c355 Christian Tismer's "trashcan" patch:
Guido van Rossum <guido@python.org>
parents: 11891
diff changeset
877
24420
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
878 PyAPI_FUNC(void) _PyTrash_deposit_object(PyObject*);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
879 PyAPI_FUNC(void) _PyTrash_destroy_chain(void);
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
880 PyAPI_DATA(int) _PyTrash_delete_nesting;
36e2fd3f08f7 Excise DL_IMPORT/EXPORT from object.h, and related files. This patch
Mark Hammond <mhammond@skippinet.com.au>
parents: 24280
diff changeset
881 PyAPI_DATA(PyObject *) _PyTrash_delete_later;
24122
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
882
11999
c94247b5c355 Christian Tismer's "trashcan" patch:
Guido van Rossum <guido@python.org>
parents: 11891
diff changeset
883 #define PyTrash_UNWIND_LEVEL 50
c94247b5c355 Christian Tismer's "trashcan" patch:
Guido van Rossum <guido@python.org>
parents: 11891
diff changeset
884
c94247b5c355 Christian Tismer's "trashcan" patch:
Guido van Rossum <guido@python.org>
parents: 11891
diff changeset
885 #define Py_TRASHCAN_SAFE_BEGIN(op) \
24122
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
886 if (_PyTrash_delete_nesting < PyTrash_UNWIND_LEVEL) { \
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
887 ++_PyTrash_delete_nesting;
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
888 /* The body of the deallocator is here. */
11999
c94247b5c355 Christian Tismer's "trashcan" patch:
Guido van Rossum <guido@python.org>
parents: 11891
diff changeset
889 #define Py_TRASHCAN_SAFE_END(op) \
c94247b5c355 Christian Tismer's "trashcan" patch:
Guido van Rossum <guido@python.org>
parents: 11891
diff changeset
890 --_PyTrash_delete_nesting; \
c94247b5c355 Christian Tismer's "trashcan" patch:
Guido van Rossum <guido@python.org>
parents: 11891
diff changeset
891 if (_PyTrash_delete_later && _PyTrash_delete_nesting <= 0) \
12481
a8898a172fe2 Christian Tismer -- total rewrite on trashcan code.
Guido van Rossum <guido@python.org>
parents: 12406
diff changeset
892 _PyTrash_destroy_chain(); \
11999
c94247b5c355 Christian Tismer's "trashcan" patch:
Guido van Rossum <guido@python.org>
parents: 11891
diff changeset
893 } \
24122
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
894 else \
d332484e394a Trashcan cleanup: Now that cyclic gc is always there, the trashcan
Tim Peters <tim.peters@gmail.com>
parents: 24121
diff changeset
895 _PyTrash_deposit_object((PyObject*)op);
12481
a8898a172fe2 Christian Tismer -- total rewrite on trashcan code.
Guido van Rossum <guido@python.org>
parents: 12406
diff changeset
896
1329
519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1324
diff changeset
897 #ifdef __cplusplus
519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1324
diff changeset
898 }
519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1324
diff changeset
899 #endif
519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1324
diff changeset
900 #endif /* !Py_OBJECT_H */