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annotate Objects/genobject.c @ 70817:dd775b1561ba

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Fix markup.
author Georg Brandl <georg@python.org>
date Tue, 14 Jun 2011 21:09:55 +0200
parents 724920a015f7
children 867ce75b885c 36df19f9e94b
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rev   line source
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1 /* Generator object implementation */
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2
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3 #include "Python.h"
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4 #include "frameobject.h"
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5 #include "structmember.h"
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6 #include "opcode.h"
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7
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8 static int
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9 gen_traverse(PyGenObject *gen, visitproc visit, void *arg)
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10 {
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11 Py_VISIT((PyObject *)gen->gi_frame);
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12 Py_VISIT(gen->gi_code);
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13 return 0;
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14 }
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15
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16 static void
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17 gen_dealloc(PyGenObject *gen)
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18 {
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19 PyObject *self = (PyObject *) gen;
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20
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21 _PyObject_GC_UNTRACK(gen);
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22
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23 if (gen->gi_weakreflist != NULL)
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24 PyObject_ClearWeakRefs(self);
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25
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26 _PyObject_GC_TRACK(self);
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27
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28 if (gen->gi_frame != NULL && gen->gi_frame->f_stacktop != NULL) {
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29 /* Generator is paused, so we need to close */
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30 Py_TYPE(gen)->tp_del(self);
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31 if (self->ob_refcnt > 0)
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32 return; /* resurrected. :( */
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33 }
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34
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35 _PyObject_GC_UNTRACK(self);
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36 Py_CLEAR(gen->gi_frame);
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37 Py_CLEAR(gen->gi_code);
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38 PyObject_GC_Del(gen);
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39 }
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40
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41
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42 static PyObject *
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43 gen_send_ex(PyGenObject *gen, PyObject *arg, int exc)
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44 {
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45 PyThreadState *tstate = PyThreadState_GET();
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46 PyFrameObject *f = gen->gi_frame;
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47 PyObject *result;
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48
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49 if (gen->gi_running) {
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50 PyErr_SetString(PyExc_ValueError,
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51 "generator already executing");
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52 return NULL;
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53 }
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54 if (f==NULL || f->f_stacktop == NULL) {
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55 /* Only set exception if called from send() */
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56 if (arg && !exc)
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57 PyErr_SetNone(PyExc_StopIteration);
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58 return NULL;
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59 }
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60
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61 if (f->f_lasti == -1) {
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62 if (arg && arg != Py_None) {
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63 PyErr_SetString(PyExc_TypeError,
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64 "can't send non-None value to a "
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65 "just-started generator");
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66 return NULL;
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67 }
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68 } else {
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69 /* Push arg onto the frame's value stack */
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70 result = arg ? arg : Py_None;
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71 Py_INCREF(result);
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72 *(f->f_stacktop++) = result;
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73 }
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74
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75 /* Generators always return to their most recent caller, not
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76 * necessarily their creator. */
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77 Py_XINCREF(tstate->frame);
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78 assert(f->f_back == NULL);
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79 f->f_back = tstate->frame;
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80
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81 gen->gi_running = 1;
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82 result = PyEval_EvalFrameEx(f, exc);
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83 gen->gi_running = 0;
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84
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85 /* Don't keep the reference to f_back any longer than necessary. It
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86 * may keep a chain of frames alive or it could create a reference
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87 * cycle. */
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88 assert(f->f_back == tstate->frame);
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89 Py_CLEAR(f->f_back);
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90
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91 /* If the generator just returned (as opposed to yielding), signal
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92 * that the generator is exhausted. */
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93 if (result == Py_None && f->f_stacktop == NULL) {
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94 Py_DECREF(result);
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95 result = NULL;
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96 /* Set exception if not called by gen_iternext() */
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97 if (arg)
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98 PyErr_SetNone(PyExc_StopIteration);
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99 }
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100
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101 if (!result || f->f_stacktop == NULL) {
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102 /* generator can't be rerun, so release the frame */
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103 Py_DECREF(f);
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104 gen->gi_frame = NULL;
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105 }
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106
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107 return result;
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108 }
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109
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110 PyDoc_STRVAR(send_doc,
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111 "send(arg) -> send 'arg' into generator,\n\
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112 return next yielded value or raise StopIteration.");
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113
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114 static PyObject *
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115 gen_send(PyGenObject *gen, PyObject *arg)
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116 {
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117 return gen_send_ex(gen, arg, 0);
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118 }
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119
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120 PyDoc_STRVAR(close_doc,
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121 "close(arg) -> raise GeneratorExit inside generator.");
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122
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123 static PyObject *
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124 gen_close(PyGenObject *gen, PyObject *args)
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125 {
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126 PyObject *retval;
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127 PyErr_SetNone(PyExc_GeneratorExit);
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128 retval = gen_send_ex(gen, Py_None, 1);
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129 if (retval) {
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130 Py_DECREF(retval);
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131 PyErr_SetString(PyExc_RuntimeError,
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132 "generator ignored GeneratorExit");
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133 return NULL;
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134 }
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135 if (PyErr_ExceptionMatches(PyExc_StopIteration)
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136 || PyErr_ExceptionMatches(PyExc_GeneratorExit))
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137 {
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138 PyErr_Clear(); /* ignore these errors */
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139 Py_INCREF(Py_None);
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140 return Py_None;
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141 }
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142 return NULL;
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143 }
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144
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145 static void
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146 gen_del(PyObject *self)
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147 {
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148 PyObject *res;
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149 PyObject *error_type, *error_value, *error_traceback;
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150 PyGenObject *gen = (PyGenObject *)self;
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151
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152 if (gen->gi_frame == NULL || gen->gi_frame->f_stacktop == NULL)
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153 /* Generator isn't paused, so no need to close */
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154 return;
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155
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156 /* Temporarily resurrect the object. */
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157 assert(self->ob_refcnt == 0);
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158 self->ob_refcnt = 1;
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159
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160 /* Save the current exception, if any. */
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161 PyErr_Fetch(&error_type, &error_value, &error_traceback);
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162
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163 res = gen_close(gen, NULL);
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164
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165 if (res == NULL)
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166 PyErr_WriteUnraisable(self);
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167 else
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168 Py_DECREF(res);
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169
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170 /* Restore the saved exception. */
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171 PyErr_Restore(error_type, error_value, error_traceback);
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172
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173 /* Undo the temporary resurrection; can't use DECREF here, it would
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174 * cause a recursive call.
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175 */
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176 assert(self->ob_refcnt > 0);
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177 if (--self->ob_refcnt == 0)
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178 return; /* this is the normal path out */
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179
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180 /* close() resurrected it! Make it look like the original Py_DECREF
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181 * never happened.
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182 */
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183 {
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184 Py_ssize_t refcnt = self->ob_refcnt;
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185 _Py_NewReference(self);
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186 self->ob_refcnt = refcnt;
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187 }
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188 assert(PyType_IS_GC(self->ob_type) &&
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189 _Py_AS_GC(self)->gc.gc_refs != _PyGC_REFS_UNTRACKED);
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190
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191 /* If Py_REF_DEBUG, _Py_NewReference bumped _Py_RefTotal, so
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192 * we need to undo that. */
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193 _Py_DEC_REFTOTAL;
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194 /* If Py_TRACE_REFS, _Py_NewReference re-added self to the object
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195 * chain, so no more to do there.
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196 * If COUNT_ALLOCS, the original decref bumped tp_frees, and
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197 * _Py_NewReference bumped tp_allocs: both of those need to be
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198 * undone.
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199 */
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200 #ifdef COUNT_ALLOCS
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201 --self->ob_type->tp_frees;
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202 --self->ob_type->tp_allocs;
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203 #endif
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204 }
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205
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206
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207
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208 PyDoc_STRVAR(throw_doc,
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209 "throw(typ[,val[,tb]]) -> raise exception in generator,\n\
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210 return next yielded value or raise StopIteration.");
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211
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212 static PyObject *
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213 gen_throw(PyGenObject *gen, PyObject *args)
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214 {
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215 PyObject *typ;
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216 PyObject *tb = NULL;
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217 PyObject *val = NULL;
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218
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219 if (!PyArg_UnpackTuple(args, "throw", 1, 3, &typ, &val, &tb))
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220 return NULL;
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221
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222 /* First, check the traceback argument, replacing None with
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223 NULL. */
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224 if (tb == Py_None)
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225 tb = NULL;
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226 else if (tb != NULL && !PyTraceBack_Check(tb)) {
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227 PyErr_SetString(PyExc_TypeError,
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228 "throw() third argument must be a traceback object");
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229 return NULL;
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230 }
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231
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232 Py_INCREF(typ);
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233 Py_XINCREF(val);
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234 Py_XINCREF(tb);
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235
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236 if (PyExceptionClass_Check(typ)) {
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237 PyErr_NormalizeException(&typ, &val, &tb);
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238 }
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239
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240 else if (PyExceptionInstance_Check(typ)) {
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241 /* Raising an instance. The value should be a dummy. */
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242 if (val && val != Py_None) {
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243 PyErr_SetString(PyExc_TypeError,
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244 "instance exception may not have a separate value");
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245 goto failed_throw;
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246 }
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247 else {
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248 /* Normalize to raise <class>, <instance> */
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249 Py_XDECREF(val);
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250 val = typ;
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251 typ = PyExceptionInstance_Class(typ);
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252 Py_INCREF(typ);
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253 }
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254 }
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255 else {
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256 /* Not something you can raise. throw() fails. */
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257 PyErr_Format(PyExc_TypeError,
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258 "exceptions must be classes or instances "
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259 "deriving from BaseException, not %s",
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260 typ->ob_type->tp_name);
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261 goto failed_throw;
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262 }
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263
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264 PyErr_Restore(typ, val, tb);
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265 return gen_send_ex(gen, Py_None, 1);
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266
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267 failed_throw:
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268 /* Didn't use our arguments, so restore their original refcounts */
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269 Py_DECREF(typ);
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270 Py_XDECREF(val);
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271 Py_XDECREF(tb);
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272 return NULL;
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273 }
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274
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275
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276 static PyObject *
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277 gen_iternext(PyGenObject *gen)
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278 {
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279 return gen_send_ex(gen, NULL, 0);
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280 }
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281
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282
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283 static PyObject *
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284 gen_repr(PyGenObject *gen)
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285 {
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286 return PyUnicode_FromFormat("<generator object %S at %p>",
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287 ((PyCodeObject *)gen->gi_code)->co_name,
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288 gen);
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289 }
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290
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291
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292 static PyObject *
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293 gen_get_name(PyGenObject *gen)
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294 {
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295 PyObject *name = ((PyCodeObject *)gen->gi_code)->co_name;
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296 Py_INCREF(name);
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297 return name;
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298 }
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299
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300
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301 PyDoc_STRVAR(gen__name__doc__,
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302 "Return the name of the generator's associated code object.");
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303
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304 static PyGetSetDef gen_getsetlist[] = {
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305 {"__name__", (getter)gen_get_name, NULL, gen__name__doc__},
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306 {NULL}
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307 };
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308
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309
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310 static PyMemberDef gen_memberlist[] = {
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311 {"gi_frame", T_OBJECT, offsetof(PyGenObject, gi_frame), READONLY},
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312 {"gi_running", T_INT, offsetof(PyGenObject, gi_running), READONLY},
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313 {"gi_code", T_OBJECT, offsetof(PyGenObject, gi_code), READONLY},
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314 {NULL} /* Sentinel */
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315 };
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316
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317 static PyMethodDef gen_methods[] = {
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318 {"send",(PyCFunction)gen_send, METH_O, send_doc},
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319 {"throw",(PyCFunction)gen_throw, METH_VARARGS, throw_doc},
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320 {"close",(PyCFunction)gen_close, METH_NOARGS, close_doc},
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321 {NULL, NULL} /* Sentinel */
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322 };
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323
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324 PyTypeObject PyGen_Type = {
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325 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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326 "generator", /* tp_name */
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327 sizeof(PyGenObject), /* tp_basicsize */
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328 0, /* tp_itemsize */
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329 /* methods */
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330 (destructor)gen_dealloc, /* tp_dealloc */
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331 0, /* tp_print */
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332 0, /* tp_getattr */
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333 0, /* tp_setattr */
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334 0, /* tp_reserved */
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335 (reprfunc)gen_repr, /* tp_repr */
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336 0, /* tp_as_number */
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337 0, /* tp_as_sequence */
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338 0, /* tp_as_mapping */
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339 0, /* tp_hash */
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340 0, /* tp_call */
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341 0, /* tp_str */
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342 PyObject_GenericGetAttr, /* tp_getattro */
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343 0, /* tp_setattro */
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344 0, /* tp_as_buffer */
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345 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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346 0, /* tp_doc */
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347 (traverseproc)gen_traverse, /* tp_traverse */
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348 0, /* tp_clear */
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349 0, /* tp_richcompare */
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350 offsetof(PyGenObject, gi_weakreflist), /* tp_weaklistoffset */
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351 PyObject_SelfIter, /* tp_iter */
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352 (iternextfunc)gen_iternext, /* tp_iternext */
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353 gen_methods, /* tp_methods */
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354 gen_memberlist, /* tp_members */
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355 gen_getsetlist, /* tp_getset */
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356 0, /* tp_base */
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357 0, /* tp_dict */
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358
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359 0, /* tp_descr_get */
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360 0, /* tp_descr_set */
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361 0, /* tp_dictoffset */
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362 0, /* tp_init */
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363 0, /* tp_alloc */
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364 0, /* tp_new */
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365 0, /* tp_free */
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366 0, /* tp_is_gc */
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367 0, /* tp_bases */
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368 0, /* tp_mro */
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369 0, /* tp_cache */
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370 0, /* tp_subclasses */
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371 0, /* tp_weaklist */
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372 gen_del, /* tp_del */
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373 };
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374
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375 PyObject *
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376 PyGen_New(PyFrameObject *f)
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377 {
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378 PyGenObject *gen = PyObject_GC_New(PyGenObject, &PyGen_Type);
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379 if (gen == NULL) {
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380 Py_DECREF(f);
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381 return NULL;
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382 }
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383 gen->gi_frame = f;
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384 Py_INCREF(f->f_code);
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385 gen->gi_code = (PyObject *)(f->f_code);
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386 gen->gi_running = 0;
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387 gen->gi_weakreflist = NULL;
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388 _PyObject_GC_TRACK(gen);
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389 return (PyObject *)gen;
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390 }
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391
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392 int
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393 PyGen_NeedsFinalizing(PyGenObject *gen)
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394 {
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395 int i;
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396 PyFrameObject *f = gen->gi_frame;
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397
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398 if (f == NULL || f->f_stacktop == NULL || f->f_iblock <= 0)
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399 return 0; /* no frame or empty blockstack == no finalization */
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400
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401 /* Any block type besides a loop requires cleanup. */
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402 i = f->f_iblock;
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403 while (--i >= 0) {
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404 if (f->f_blockstack[i].b_type != SETUP_LOOP)
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405 return 1;
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406 }
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407
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408 /* No blocks except loops, it's safe to skip finalization. */
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409 return 0;
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410 }