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annotate Python/symtable.c @ 33940:dfd07b7be407 legacy-trunk

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SF bug 1061968: threads: segfault or Py_FatalError at exit PyGILState_Ensure(): The fix in 2.4a3 for bug 1010677 reintroduced thread shutdown race bug 225673. Repaired by (once again) ensuring the GIL is held whenever deleting a thread state. Alas, there's no useful test case for this shy bug. Four years ago, only Guido could provoke it, on his box, and today only Armin can provoke it on his box. I've never been able to provoke it (but not for lack of trying!). This is a critical fix for 2.3.5 too, since the fix for 1010677 got backported there already and so also reintroduced 225673. I don't intend to backport this fix. For whoever (if anyone) does, there are other thread fixes in 2.4 that need backporting too, and I bet they need to happen first for this patch to apply cleanly.
author Tim Peters <tim.peters@gmail.com>
date Mon, 08 Nov 2004 04:30:21 +0000
parents 302d399cfd37
children 1c4d192f1568
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1 #include "Python.h"
16799
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
21325
8a26bb369f53 Add a comment explaining the st_symbols cache.
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7 /* The compiler uses this function to load a PySymtableEntry object
8a26bb369f53 Add a comment explaining the st_symbols cache.
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8 for a code block. Each block is loaded twice, once during the
8a26bb369f53 Add a comment explaining the st_symbols cache.
Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21314
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9 symbol table pass and once during the code gen pass. Entries
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parents: 21314
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10 created during the first pass are cached for the second pass, using
8a26bb369f53 Add a comment explaining the st_symbols cache.
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parents: 21314
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11 the st_symbols dictionary.
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12
8a26bb369f53 Add a comment explaining the st_symbols cache.
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parents: 21314
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13 The cache is keyed by st_nscopes. Each code block node in a
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parents: 21314
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14 module's parse tree can be assigned a unique id based on the order
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Jeremy Hylton <jeremy@alum.mit.edu>
parents: 21314
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15 in which the nodes are visited by the compiler. This strategy
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parents: 21314
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16 works so long as the symbol table and codegen passes visit the same
8a26bb369f53 Add a comment explaining the st_symbols cache.
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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
16781
5a1230de436a Preliminary support for future nested scopes
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62 ste->ste_optimized = 0;
21179
485422900ef0 SF bug #488687 reported by Neal Norwitz
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63 ste->ste_opt_lineno = 0;
29226
3aaf24b949df Backport fix for SF bug 734869 and sundry compiler cleanups.
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64 ste->ste_tmpname = 0;
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65 ste->ste_lineno = lineno;
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66 switch (type) {
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67 case funcdef:
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68 case lambdef:
32121
302d399cfd37 SF patch #872326: Generator expression implementation
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69 case testlist_gexp: /* generator expression */
302d399cfd37 SF patch #872326: Generator expression implementation
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70 case argument: /* generator expression */
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71 ste->ste_type = TYPE_FUNCTION;
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72 break;
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73 case classdef:
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74 ste->ste_type = TYPE_CLASS;
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75 break;
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76 case single_input:
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77 case eval_input:
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78 case file_input:
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79 ste->ste_type = TYPE_MODULE;
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80 break;
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81 }
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82
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83 if (st->st_cur == NULL)
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84 ste->ste_nested = 0;
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85 else if (st->st_cur->ste_nested
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86 || st->st_cur->ste_type == TYPE_FUNCTION)
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87 ste->ste_nested = 1;
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88 else
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89 ste->ste_nested = 0;
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90 ste->ste_child_free = 0;
18148
7bc473b2c654 Merging the gen-branch into the main line, at Guido's direction. Yay!
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91 ste->ste_generator = 0;
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92
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93 if (PyDict_SetItem(st->st_symbols, ste->ste_id, (PyObject *)ste) < 0)
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94 goto fail;
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51977af230fa Fix for bug 133489: compiler leaks memory
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parents: 16539
diff changeset
95
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96 return (PyObject *)ste;
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97 fail:
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98 Py_XDECREF(ste);
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99 return NULL;
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100 }
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101
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102 static PyObject *
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103 ste_repr(PySymtableEntryObject *ste)
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104 {
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105 char buf[256];
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106
21090
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parents: 20012
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107 PyOS_snprintf(buf, sizeof(buf),
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108 "<symtable entry %.100s(%ld), line %d>",
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109 PyString_AS_STRING(ste->ste_name),
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110 PyInt_AS_LONG(ste->ste_id),
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111 ste->ste_lineno);
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112 return PyString_FromString(buf);
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113 }
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114
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115 static void
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116 ste_dealloc(PySymtableEntryObject *ste)
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117 {
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118 ste->ste_table = NULL;
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119 Py_XDECREF(ste->ste_id);
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120 Py_XDECREF(ste->ste_name);
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121 Py_XDECREF(ste->ste_symbols);
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122 Py_XDECREF(ste->ste_varnames);
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123 Py_XDECREF(ste->ste_children);
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124 PyObject_Del(ste);
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125 }
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126
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127 #define OFF(x) offsetof(PySymtableEntryObject, x)
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128
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129 static PyMemberDef ste_memberlist[] = {
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130 {"id", T_OBJECT, OFF(ste_id), READONLY},
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131 {"name", T_OBJECT, OFF(ste_name), READONLY},
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132 {"symbols", T_OBJECT, OFF(ste_symbols), READONLY},
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133 {"varnames", T_OBJECT, OFF(ste_varnames), READONLY},
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134 {"children", T_OBJECT, OFF(ste_children), READONLY},
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135 {"type", T_INT, OFF(ste_type), READONLY},
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136 {"lineno", T_INT, OFF(ste_lineno), READONLY},
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137 {"optimized",T_INT, OFF(ste_optimized), READONLY},
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138 {"nested", T_INT, OFF(ste_nested), READONLY},
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139 {NULL}
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140 };
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141
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142 PyTypeObject PySymtableEntry_Type = {
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143 PyObject_HEAD_INIT(&PyType_Type)
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144 0,
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145 "symtable entry",
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146 sizeof(PySymtableEntryObject),
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147 0,
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148 (destructor)ste_dealloc, /* tp_dealloc */
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149 0, /* tp_print */
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150 0, /* tp_getattr */
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151 0, /* tp_setattr */
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152 0, /* tp_compare */
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153 (reprfunc)ste_repr, /* tp_repr */
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154 0, /* tp_as_number */
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155 0, /* tp_as_sequence */
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156 0, /* tp_as_mapping */
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157 0, /* tp_hash */
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158 0, /* tp_call */
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159 0, /* tp_str */
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160 PyObject_GenericGetAttr, /* tp_getattro */
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161 0, /* tp_setattro */
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162 0, /* tp_as_buffer */
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163 Py_TPFLAGS_DEFAULT, /* tp_flags */
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164 0, /* tp_doc */
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165 0, /* tp_traverse */
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166 0, /* tp_clear */
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167 0, /* tp_richcompare */
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168 0, /* tp_weaklistoffset */
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169 0, /* tp_iter */
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170 0, /* tp_iternext */
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171 0, /* tp_methods */
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172 ste_memberlist, /* tp_members */
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173 0, /* tp_getset */
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174 0, /* tp_base */
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175 0, /* tp_dict */
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176 0, /* tp_descr_get */
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177 0, /* tp_descr_set */
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178 0, /* tp_dictoffset */
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179 0, /* tp_init */
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180 0, /* tp_alloc */
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181 0, /* tp_new */
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182 };