Mercurial > cpython-lru_cache-weakref

annotate Python/symtable.c @ 28572:faeb708bacc4 2.2

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Backport: PyErr_NormalizeException(): in the type==NULL test, we should simply return. Setting an exception can mess with the exception state, and continuing is definitely wrong (since type is dereferenced later on). Some code that calls this seems to be prepared for a NULL exception type, so let's be safe rather than sorry and simply assume there's nothing to normalize in this case.
author Guido van Rossum <guido@python.org>
date Thu, 10 Apr 2003 20:30:18 +0000
parents 8a26bb369f53
children 3aaf24b949df
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "Python.h"
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08d937107fe6 Improved __future__ parser; still more to do
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2 #include "compile.h"
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3 #include "symtable.h"
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4 #include "graminit.h"
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5 #include "structmember.h"
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6
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8a26bb369f53 Add a comment explaining the st_symbols cache.
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7 /* The compiler uses this function to load a PySymtableEntry object
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8 for a code block. Each block is loaded twice, once during the
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9 symbol table pass and once during the code gen pass. Entries
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10 created during the first pass are cached for the second pass, using
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11 the st_symbols dictionary.
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12
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13 The cache is keyed by st_nscopes. Each code block node in a
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14 module's parse tree can be assigned a unique id based on the order
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15 in which the nodes are visited by the compiler. This strategy
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16 works so long as the symbol table and codegen passes visit the same
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17 nodes in the same order.
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18 */
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19
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20
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21 PyObject *
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22 PySymtableEntry_New(struct symtable *st, char *name, int type, int lineno)
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23 {
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24 PySymtableEntryObject *ste = NULL;
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25 PyObject *k, *v;
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26
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27 k = PyInt_FromLong(st->st_nscopes++);
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28 if (k == NULL)
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29 goto fail;
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30 v = PyDict_GetItem(st->st_symbols, k);
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31 if (v) {
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4d5098cfa781 PySymtableEntry_New(): I'm not sure what this routine is doing, but it
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32 Py_DECREF(k);
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33 Py_INCREF(v);
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34 return v;
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35 }
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36
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37 ste = (PySymtableEntryObject *)PyObject_New(PySymtableEntryObject,
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38 &PySymtableEntry_Type);
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39 ste->ste_table = st;
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40 ste->ste_id = k;
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41
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42 v = PyString_FromString(name);
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43 if (v == NULL)
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44 goto fail;
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45 ste->ste_name = v;
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46
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47 v = PyDict_New();
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48 if (v == NULL)
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49 goto fail;
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50 ste->ste_symbols = v;
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51
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52 v = PyList_New(0);
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53 if (v == NULL)
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54 goto fail;
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55 ste->ste_varnames = v;
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56
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57 v = PyList_New(0);
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58 if (v == NULL)
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59 goto fail;
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60 ste->ste_children = v;
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61
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62 ste->ste_optimized = 0;
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63 ste->ste_opt_lineno = 0;
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64 ste->ste_lineno = lineno;
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65 switch (type) {
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66 case funcdef:
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67 case lambdef:
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68 ste->ste_type = TYPE_FUNCTION;
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69 break;
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70 case classdef:
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71 ste->ste_type = TYPE_CLASS;
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72 break;
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73 case single_input:
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74 case eval_input:
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75 case file_input:
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76 ste->ste_type = TYPE_MODULE;
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77 break;
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78 }
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79
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80 if (st->st_cur == NULL)
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81 ste->ste_nested = 0;
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82 else if (st->st_cur->ste_nested
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83 || st->st_cur->ste_type == TYPE_FUNCTION)
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84 ste->ste_nested = 1;
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85 else
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86 ste->ste_nested = 0;
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87 ste->ste_child_free = 0;
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88 ste->ste_generator = 0;
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89
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90 if (PyDict_SetItem(st->st_symbols, ste->ste_id, (PyObject *)ste) < 0)
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91 goto fail;
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92
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93 return (PyObject *)ste;
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94 fail:
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95 Py_XDECREF(ste);
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96 return NULL;
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97 }
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98
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99 static PyObject *
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100 ste_repr(PySymtableEntryObject *ste)
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101 {
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102 char buf[256];
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103
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104 PyOS_snprintf(buf, sizeof(buf),
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105 "<symtable entry %.100s(%ld), line %d>",
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106 PyString_AS_STRING(ste->ste_name),
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107 PyInt_AS_LONG(ste->ste_id),
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108 ste->ste_lineno);
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109 return PyString_FromString(buf);
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110 }
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111
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112 static void
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113 ste_dealloc(PySymtableEntryObject *ste)
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114 {
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115 ste->ste_table = NULL;
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116 Py_XDECREF(ste->ste_id);
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117 Py_XDECREF(ste->ste_name);
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118 Py_XDECREF(ste->ste_symbols);
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119 Py_XDECREF(ste->ste_varnames);
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120 Py_XDECREF(ste->ste_children);
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121 PyObject_Del(ste);
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122 }
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123
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124 #define OFF(x) offsetof(PySymtableEntryObject, x)
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125
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126 static PyMemberDef ste_memberlist[] = {
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127 {"id", T_OBJECT, OFF(ste_id), READONLY},
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128 {"name", T_OBJECT, OFF(ste_name), READONLY},
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129 {"symbols", T_OBJECT, OFF(ste_symbols), READONLY},
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130 {"varnames", T_OBJECT, OFF(ste_varnames), READONLY},
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131 {"children", T_OBJECT, OFF(ste_children), READONLY},
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132 {"type", T_INT, OFF(ste_type), READONLY},
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133 {"lineno", T_INT, OFF(ste_lineno), READONLY},
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134 {"optimized",T_INT, OFF(ste_optimized), READONLY},
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135 {"nested", T_INT, OFF(ste_nested), READONLY},
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136 {NULL}
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137 };
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138
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139 PyTypeObject PySymtableEntry_Type = {
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140 PyObject_HEAD_INIT(&PyType_Type)
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141 0,
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142 "symtable entry",
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143 sizeof(PySymtableEntryObject),
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144 0,
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145 (destructor)ste_dealloc, /* tp_dealloc */
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146 0, /* tp_print */
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147 0, /* tp_getattr */
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148 0, /* tp_setattr */
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149 0, /* tp_compare */
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150 (reprfunc)ste_repr, /* tp_repr */
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151 0, /* tp_as_number */
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152 0, /* tp_as_sequence */
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153 0, /* tp_as_mapping */
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154 0, /* tp_hash */
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155 0, /* tp_call */
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156 0, /* tp_str */
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157 PyObject_GenericGetAttr, /* tp_getattro */
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158 0, /* tp_setattro */
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159 0, /* tp_as_buffer */
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160 Py_TPFLAGS_DEFAULT, /* tp_flags */
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161 0, /* tp_doc */
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162 0, /* tp_traverse */
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163 0, /* tp_clear */
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164 0, /* tp_richcompare */
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165 0, /* tp_weaklistoffset */
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166 0, /* tp_iter */
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167 0, /* tp_iternext */
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168 0, /* tp_methods */
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169 ste_memberlist, /* tp_members */
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170 0, /* tp_getset */
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171 0, /* tp_base */
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172 0, /* tp_dict */
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173 0, /* tp_descr_get */
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174 0, /* tp_descr_set */
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175 0, /* tp_dictoffset */
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176 0, /* tp_init */
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177 0, /* tp_alloc */
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178 0, /* tp_new */
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179 };