Mercurial > cpython-lru_cache-weakref

annotate Python/symtable.c @ 17104:a488a63cb867 legacy-trunk

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Fix PyFrame_FastToLocals() and counterpart to deal with cells and frees. Note there doesn't seem to be any way to test LocalsToFast(), because the instructions that trigger it are illegal in nested scopes with free variables. Fix allocation strategy for cells that are also formal parameters. Instead of emitting LOAD_FAST / STORE_DEREF pairs for each parameter, have the argument handling code in eval_code2() do the right thing. A side-effect of this change is that cell variables that are also arguments are listed at the front of co_cellvars in the order they appear in the argument list.
author Jeremy Hylton <jeremy@alum.mit.edu>
date Wed, 21 Mar 2001 16:43:47 +0000
parents 08d937107fe6
children 568c75dd5078 7bc473b2c654
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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
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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 };