Mercurial > cpython-lru_cache-weakref

annotate Python/symtable.c @ 16539:a47d93ef103a legacy-trunk

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Relax the rules for using 'from ... import *' and exec in the presence of nested functions. Either is allowed in a function if it contains no defs or lambdas or the defs and lambdas it contains have no free variables. If a function is itself nested and has free variables, either is illegal. Revise the symtable to use a PySymtableEntryObject, which holds all the revelent information for a scope, rather than using a bunch of st_cur_XXX pointers in the symtable struct. The changes simplify the internal management of the current symtable scope and of the stack. Added new C source file: Python/symtable.c. (Does the Windows build process need to be updated?) As part of these changes, the initial _symtable module interface introduced in 2.1a2 is replaced. A dictionary of PySymtableEntryObjects are returned.
author Jeremy Hylton <jeremy@alum.mit.edu>
date Fri, 09 Feb 2001 22:22:18 +0000
parents
children 51977af230fa
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
16539
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1 #include "Python.h"
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2 #include "symtable.h"
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3 #include "graminit.h"
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4 #include "structmember.h"
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5
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6 PyObject *
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7 PySymtableEntry_New(struct symtable *st, char *name, int type, int lineno)
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8 {
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9 PySymtableEntryObject *ste = NULL;
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10 PyObject *k, *v;
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11
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12 k = PyInt_FromLong(st->st_nscopes++);
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13 if (k == NULL)
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14 goto fail;
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15 v = PyDict_GetItem(st->st_symbols, k);
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16 if (v) /* XXX could check that name, type, lineno match */
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17 return v;
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18
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19 ste = (PySymtableEntryObject *)PyObject_New(PySymtableEntryObject,
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20 &PySymtableEntry_Type);
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21 ste->ste_table = st;
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22 ste->ste_id = k;
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23
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24 v = PyString_FromString(name);
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25 if (v == NULL)
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26 goto fail;
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27 ste->ste_name = v;
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28
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29 v = PyDict_New();
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30 if (v == NULL)
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31 goto fail;
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32 ste->ste_symbols = v;
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33
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34 v = PyList_New(0);
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35 if (v == NULL)
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36 goto fail;
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37 ste->ste_varnames = v;
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38
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39 v = PyList_New(0);
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40 if (v == NULL)
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41 goto fail;
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42 ste->ste_children = v;
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43
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44 ste->ste_optimized = 1;
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45 ste->ste_lineno = lineno;
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46 switch (type) {
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47 case funcdef:
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48 case lambdef:
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49 ste->ste_type = TYPE_FUNCTION;
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50 break;
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51 case classdef:
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52 ste->ste_type = TYPE_CLASS;
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53 break;
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54 case single_input:
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55 case eval_input:
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56 case file_input:
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57 ste->ste_type = TYPE_MODULE;
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58 break;
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59 }
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60
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61 if (st->st_cur == NULL)
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62 ste->ste_nested = 0;
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63 else if (st->st_cur->ste_nested
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64 || st->st_cur->ste_type == TYPE_FUNCTION)
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65 ste->ste_nested = 1;
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66 else
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67 ste->ste_nested = 0;
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68 ste->ste_child_free = 0;
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69
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70 if (PyDict_SetItem(st->st_symbols, ste->ste_id, (PyObject *)ste) < 0)
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71 goto fail;
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72
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73 return (PyObject *)ste;
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74 fail:
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75 Py_XDECREF(ste);
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76 return NULL;
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77 }
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78
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79 static PyObject *
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80 ste_repr(PySymtableEntryObject *ste)
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81 {
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82 char buf[256];
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83
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84 sprintf(buf, "<symtable entry %.100s(%ld), line %d>",
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85 PyString_AS_STRING(ste->ste_name),
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86 PyInt_AS_LONG(ste->ste_id),
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87 ste->ste_lineno);
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88 return PyString_FromString(buf);
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89 }
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90
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91 static void
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92 ste_dealloc(PySymtableEntryObject *ste)
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93 {
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94 ste->ste_table = NULL;
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95 Py_XDECREF(ste->ste_id);
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96 Py_XDECREF(ste->ste_name);
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97 Py_XDECREF(ste->ste_symbols);
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98 Py_XDECREF(ste->ste_varnames);
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99 Py_XDECREF(ste->ste_children);
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100 PyObject_Del(ste);
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101 }
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102
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103 #define OFF(x) offsetof(PySymtableEntryObject, x)
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104
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105 static struct memberlist ste_memberlist[] = {
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106 {"id", T_OBJECT, OFF(ste_id), READONLY},
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107 {"name", T_OBJECT, OFF(ste_name), READONLY},
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108 {"symbols", T_OBJECT, OFF(ste_symbols), READONLY},
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109 {"varnames", T_OBJECT, OFF(ste_varnames), READONLY},
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110 {"children", T_OBJECT, OFF(ste_children), READONLY},
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111 {"type", T_INT, OFF(ste_type), READONLY},
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112 {"lineno", T_INT, OFF(ste_lineno), READONLY},
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113 {"optimized",T_INT, OFF(ste_optimized), READONLY},
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114 {"nested", T_INT, OFF(ste_nested), READONLY},
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115 {NULL}
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116 };
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117
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118 static PyObject *
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119 ste_getattr(PySymtableEntryObject *ste, char *name)
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120 {
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121 return PyMember_Get((char *)ste, ste_memberlist, name);
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122 }
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123
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124 PyTypeObject PySymtableEntry_Type = {
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125 PyObject_HEAD_INIT(&PyType_Type)
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126 0,
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127 "symtable entry",
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128 sizeof(PySymtableEntryObject),
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129 0,
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130 (destructor)ste_dealloc, /* tp_dealloc */
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131 0, /* tp_print */
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132 (getattrfunc)ste_getattr, /* tp_getattr */
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133 0, /* tp_setattr */
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134 0, /* tp_compare */
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135 (reprfunc)ste_repr, /* tp_repr */
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136 0, /* tp_as_number */
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137 0, /* tp_as_sequence */
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138 0, /* tp_as_mapping */
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139 0, /* tp_hash */
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140 0, /* tp_call */
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141 0, /* tp_str */
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142 0, /* tp_getattro */
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143 0, /* tp_setattro */
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144 0, /* tp_as_buffer */
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145 Py_TPFLAGS_DEFAULT, /* tp_flags */
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146 0, /* tp_doc */
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147 };