Mercurial > cpython-lru_cache-weakref

annotate Python/symtable.c @ 21509:568c75dd5078 2.1

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backport 2.9: PySymtableEntry_New(): I'm not sure what this routine is doing, but it was obviously leaking an int object when whatever the heck it's looking for was found. Repaired that. This accounts for why entering function and class definitions at an interactive prompt leaked a reference to the integer 1 each time.
author Anthony Baxter <anthonybaxter@gmail.com>
date Fri, 21 Dec 2001 03:45:15 +0000
parents 08d937107fe6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "Python.h"
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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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7 PyObject *
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8 PySymtableEntry_New(struct symtable *st, char *name, int type, int lineno)
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9 {
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10 PySymtableEntryObject *ste = NULL;
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11 PyObject *k, *v;
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12
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13 k = PyInt_FromLong(st->st_nscopes++);
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14 if (k == NULL)
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15 goto fail;
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16 v = PyDict_GetItem(st->st_symbols, k);
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17 if (v) /* XXX could check that name, type, lineno match */ {
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18 Py_DECREF(k);
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19 Py_INCREF(v);
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20 return v;
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21 }
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22
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23 ste = (PySymtableEntryObject *)PyObject_New(PySymtableEntryObject,
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24 &PySymtableEntry_Type);
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25 ste->ste_table = st;
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26 ste->ste_id = k;
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27
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28 v = PyString_FromString(name);
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29 if (v == NULL)
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30 goto fail;
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31 ste->ste_name = v;
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32
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33 v = PyDict_New();
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34 if (v == NULL)
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35 goto fail;
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36 ste->ste_symbols = v;
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37
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38 v = PyList_New(0);
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39 if (v == NULL)
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40 goto fail;
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41 ste->ste_varnames = v;
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42
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43 v = PyList_New(0);
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44 if (v == NULL)
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45 goto fail;
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46 ste->ste_children = v;
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47
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48 ste->ste_optimized = 0;
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49 ste->ste_lineno = lineno;
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50 switch (type) {
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51 case funcdef:
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52 case lambdef:
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53 ste->ste_type = TYPE_FUNCTION;
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54 break;
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55 case classdef:
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56 ste->ste_type = TYPE_CLASS;
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57 break;
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58 case single_input:
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59 case eval_input:
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60 case file_input:
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61 ste->ste_type = TYPE_MODULE;
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62 break;
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63 }
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64
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65 if (st->st_cur == NULL)
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66 ste->ste_nested = 0;
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67 else if (st->st_cur->ste_nested
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68 || st->st_cur->ste_type == TYPE_FUNCTION)
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69 ste->ste_nested = 1;
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70 else
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71 ste->ste_nested = 0;
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72 ste->ste_child_free = 0;
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73
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74 if (PyDict_SetItem(st->st_symbols, ste->ste_id, (PyObject *)ste) < 0)
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75 goto fail;
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76
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77 return (PyObject *)ste;
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78 fail:
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79 Py_XDECREF(ste);
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80 return NULL;
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81 }
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82
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83 static PyObject *
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84 ste_repr(PySymtableEntryObject *ste)
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85 {
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86 char buf[256];
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87
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88 sprintf(buf, "<symtable entry %.100s(%ld), line %d>",
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89 PyString_AS_STRING(ste->ste_name),
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90 PyInt_AS_LONG(ste->ste_id),
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91 ste->ste_lineno);
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92 return PyString_FromString(buf);
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93 }
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94
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95 static void
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96 ste_dealloc(PySymtableEntryObject *ste)
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97 {
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98 ste->ste_table = NULL;
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99 Py_XDECREF(ste->ste_id);
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100 Py_XDECREF(ste->ste_name);
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101 Py_XDECREF(ste->ste_symbols);
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102 Py_XDECREF(ste->ste_varnames);
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103 Py_XDECREF(ste->ste_children);
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104 PyObject_Del(ste);
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105 }
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106
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107 #define OFF(x) offsetof(PySymtableEntryObject, x)
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108
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109 static struct memberlist ste_memberlist[] = {
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110 {"id", T_OBJECT, OFF(ste_id), READONLY},
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111 {"name", T_OBJECT, OFF(ste_name), READONLY},
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112 {"symbols", T_OBJECT, OFF(ste_symbols), READONLY},
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113 {"varnames", T_OBJECT, OFF(ste_varnames), READONLY},
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114 {"children", T_OBJECT, OFF(ste_children), READONLY},
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115 {"type", T_INT, OFF(ste_type), READONLY},
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116 {"lineno", T_INT, OFF(ste_lineno), READONLY},
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117 {"optimized",T_INT, OFF(ste_optimized), READONLY},
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118 {"nested", T_INT, OFF(ste_nested), READONLY},
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119 {NULL}
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120 };
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121
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122 static PyObject *
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123 ste_getattr(PySymtableEntryObject *ste, char *name)
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124 {
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125 return PyMember_Get((char *)ste, ste_memberlist, name);
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126 }
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127
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128 PyTypeObject PySymtableEntry_Type = {
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129 PyObject_HEAD_INIT(&PyType_Type)
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130 0,
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131 "symtable entry",
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132 sizeof(PySymtableEntryObject),
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133 0,
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134 (destructor)ste_dealloc, /* tp_dealloc */
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135 0, /* tp_print */
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136 (getattrfunc)ste_getattr, /* tp_getattr */
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137 0, /* tp_setattr */
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138 0, /* tp_compare */
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139 (reprfunc)ste_repr, /* tp_repr */
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140 0, /* tp_as_number */
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141 0, /* tp_as_sequence */
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142 0, /* tp_as_mapping */
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143 0, /* tp_hash */
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144 0, /* tp_call */
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145 0, /* tp_str */
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146 0, /* tp_getattro */
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147 0, /* tp_setattro */
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148 0, /* tp_as_buffer */
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149 Py_TPFLAGS_DEFAULT, /* tp_flags */
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150 0, /* tp_doc */
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151 };