Mercurial > cpython-lru_cache-weakref

annotate Python/symtable.c @ 16862:77a5470299db legacy-trunk

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Add warning/error handlin for problematic nested scopes cases as described in PEP 227. symtable_check_unoptimized() warns about import * and exec with "in" when it is used in a function that contains a nested function with free variables. Warnings are issued unless nested scopes are in effect, in which case these are SyntaxErrors. symtable_check_shadow() warns about assignments in a function scope that shadow free variables defined in a nested scope. This will always generate a warning -- and will behave differently with nested scopes than without. Restore full checking for free vars in children, even when nested scopes are not enabled. This is needed to support warnings for shadowing. Change symtable_warn() to return an int-- the return value of PyErr_WarnExplicit. Sundry cleanup: Remove commented out code. Break long lines.
author Jeremy Hylton <jeremy@alum.mit.edu>
date Wed, 28 Feb 2001 22:54:51 +0000
parents 08d937107fe6
children 568c75dd5078 7bc473b2c654
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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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_INCREF(v);
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19 return v;
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20 }
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21
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22 ste = (PySymtableEntryObject *)PyObject_New(PySymtableEntryObject,
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23 &PySymtableEntry_Type);
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24 ste->ste_table = st;
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25 ste->ste_id = k;
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26
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27 v = PyString_FromString(name);
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28 if (v == NULL)
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29 goto fail;
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30 ste->ste_name = v;
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31
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32 v = PyDict_New();
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33 if (v == NULL)
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34 goto fail;
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35 ste->ste_symbols = v;
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36
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37 v = PyList_New(0);
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38 if (v == NULL)
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39 goto fail;
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40 ste->ste_varnames = v;
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41
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42 v = PyList_New(0);
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43 if (v == NULL)
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44 goto fail;
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45 ste->ste_children = v;
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46
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47 ste->ste_optimized = 0;
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48 ste->ste_lineno = lineno;
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49 switch (type) {
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50 case funcdef:
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51 case lambdef:
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52 ste->ste_type = TYPE_FUNCTION;
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53 break;
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54 case classdef:
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55 ste->ste_type = TYPE_CLASS;
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56 break;
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57 case single_input:
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58 case eval_input:
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59 case file_input:
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60 ste->ste_type = TYPE_MODULE;
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61 break;
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62 }
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63
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64 if (st->st_cur == NULL)
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65 ste->ste_nested = 0;
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66 else if (st->st_cur->ste_nested
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67 || st->st_cur->ste_type == TYPE_FUNCTION)
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68 ste->ste_nested = 1;
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69 else
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70 ste->ste_nested = 0;
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71 ste->ste_child_free = 0;
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72
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73 if (PyDict_SetItem(st->st_symbols, ste->ste_id, (PyObject *)ste) < 0)
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74 goto fail;
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75
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76 return (PyObject *)ste;
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77 fail:
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78 Py_XDECREF(ste);
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79 return NULL;
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80 }
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81
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82 static PyObject *
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83 ste_repr(PySymtableEntryObject *ste)
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84 {
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85 char buf[256];
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86
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87 sprintf(buf, "<symtable entry %.100s(%ld), line %d>",
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88 PyString_AS_STRING(ste->ste_name),
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89 PyInt_AS_LONG(ste->ste_id),
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90 ste->ste_lineno);
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91 return PyString_FromString(buf);
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92 }
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93
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94 static void
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95 ste_dealloc(PySymtableEntryObject *ste)
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96 {
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97 ste->ste_table = NULL;
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98 Py_XDECREF(ste->ste_id);
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99 Py_XDECREF(ste->ste_name);
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100 Py_XDECREF(ste->ste_symbols);
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101 Py_XDECREF(ste->ste_varnames);
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102 Py_XDECREF(ste->ste_children);
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103 PyObject_Del(ste);
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104 }
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105
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106 #define OFF(x) offsetof(PySymtableEntryObject, x)
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107
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108 static struct memberlist ste_memberlist[] = {
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109 {"id", T_OBJECT, OFF(ste_id), READONLY},
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110 {"name", T_OBJECT, OFF(ste_name), READONLY},
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111 {"symbols", T_OBJECT, OFF(ste_symbols), READONLY},
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112 {"varnames", T_OBJECT, OFF(ste_varnames), READONLY},
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113 {"children", T_OBJECT, OFF(ste_children), READONLY},
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114 {"type", T_INT, OFF(ste_type), READONLY},
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115 {"lineno", T_INT, OFF(ste_lineno), READONLY},
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116 {"optimized",T_INT, OFF(ste_optimized), READONLY},
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117 {"nested", T_INT, OFF(ste_nested), READONLY},
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118 {NULL}
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119 };
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120
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121 static PyObject *
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122 ste_getattr(PySymtableEntryObject *ste, char *name)
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123 {
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124 return PyMember_Get((char *)ste, ste_memberlist, name);
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125 }
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126
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127 PyTypeObject PySymtableEntry_Type = {
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128 PyObject_HEAD_INIT(&PyType_Type)
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129 0,
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130 "symtable entry",
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131 sizeof(PySymtableEntryObject),
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132 0,
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133 (destructor)ste_dealloc, /* tp_dealloc */
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134 0, /* tp_print */
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135 (getattrfunc)ste_getattr, /* tp_getattr */
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136 0, /* tp_setattr */
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137 0, /* tp_compare */
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138 (reprfunc)ste_repr, /* tp_repr */
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139 0, /* tp_as_number */
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140 0, /* tp_as_sequence */
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141 0, /* tp_as_mapping */
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142 0, /* tp_hash */
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143 0, /* tp_call */
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144 0, /* tp_str */
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145 0, /* tp_getattro */
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146 0, /* tp_setattro */
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147 0, /* tp_as_buffer */
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148 Py_TPFLAGS_DEFAULT, /* tp_flags */
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149 0, /* tp_doc */
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150 };