Mercurial > cpython-lru_cache-weakref

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents df2fdd42b375
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 "Python-ast.h"
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3 #include "node.h"
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4 #include "token.h"
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5 #include "graminit.h"
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6 #include "code.h"
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7 #include "symtable.h"
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8
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9 #define UNDEFINED_FUTURE_FEATURE "future feature %.100s is not defined"
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10 #define ERR_LATE_FUTURE \
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11 "from __future__ imports must occur at the beginning of the file"
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12
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13 static int
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14 future_check_features(PyFutureFeatures *ff, stmt_ty s, PyObject *filename)
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15 {
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16 int i;
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17 asdl_seq *names;
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18
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19 assert(s->kind == ImportFrom_kind);
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20
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21 names = s->v.ImportFrom.names;
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22 for (i = 0; i < asdl_seq_LEN(names); i++) {
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23 alias_ty name = (alias_ty)asdl_seq_GET(names, i);
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24 const char *feature = _PyUnicode_AsString(name->name);
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25 if (!feature)
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26 return 0;
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27 if (strcmp(feature, FUTURE_NESTED_SCOPES) == 0) {
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28 continue;
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29 } else if (strcmp(feature, FUTURE_GENERATORS) == 0) {
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30 continue;
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31 } else if (strcmp(feature, FUTURE_DIVISION) == 0) {
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32 continue;
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33 } else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) {
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34 continue;
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35 } else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
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36 continue;
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37 } else if (strcmp(feature, FUTURE_PRINT_FUNCTION) == 0) {
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38 continue;
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39 } else if (strcmp(feature, FUTURE_UNICODE_LITERALS) == 0) {
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40 continue;
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41 } else if (strcmp(feature, FUTURE_BARRY_AS_BDFL) == 0) {
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42 ff->ff_features |= CO_FUTURE_BARRY_AS_BDFL;
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43 } else if (strcmp(feature, "braces") == 0) {
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44 PyErr_SetString(PyExc_SyntaxError,
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45 "not a chance");
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46 PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset);
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47 return 0;
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48 } else {
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49 PyErr_Format(PyExc_SyntaxError,
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50 UNDEFINED_FUTURE_FEATURE, feature);
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51 PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset);
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52 return 0;
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53 }
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54 }
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55 return 1;
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56 }
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57
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58 static int
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59 future_parse(PyFutureFeatures *ff, mod_ty mod, PyObject *filename)
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60 {
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61 int i, done = 0, prev_line = 0;
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62 stmt_ty first;
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63
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64 if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
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65 return 1;
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66
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67 if (asdl_seq_LEN(mod->v.Module.body) == 0)
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68 return 1;
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69
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70 /* A subsequent pass will detect future imports that don't
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71 appear at the beginning of the file. There's one case,
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72 however, that is easier to handle here: A series of imports
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73 joined by semi-colons, where the first import is a future
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74 statement but some subsequent import has the future form
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75 but is preceded by a regular import.
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76 */
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77
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78 i = 0;
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79 first = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
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80 if (first->kind == Expr_kind && first->v.Expr.value->kind == Str_kind)
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81 i++;
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82
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83
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84 for (; i < asdl_seq_LEN(mod->v.Module.body); i++) {
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85 stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
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86
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87 if (done && s->lineno > prev_line)
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88 return 1;
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89 prev_line = s->lineno;
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90
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91 /* The tests below will return from this function unless it is
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92 still possible to find a future statement. The only things
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93 that can precede a future statement are another future
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94 statement and a doc string.
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95 */
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96
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97 if (s->kind == ImportFrom_kind) {
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98 identifier modname = s->v.ImportFrom.module;
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99 if (modname &&
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100 !PyUnicode_CompareWithASCIIString(modname, "__future__")) {
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101 if (done) {
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102 PyErr_SetString(PyExc_SyntaxError,
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103 ERR_LATE_FUTURE);
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104 PyErr_SyntaxLocationObject(filename, s->lineno, s->col_offset);
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105 return 0;
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106 }
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107 if (!future_check_features(ff, s, filename))
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108 return 0;
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109 ff->ff_lineno = s->lineno;
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110 }
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111 else {
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112 done = 1;
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113 }
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114 }
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115 else {
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116 done = 1;
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117 }
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118 }
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119 return 1;
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120 }
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121
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123 PyFutureFeatures *
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124 PyFuture_FromASTObject(mod_ty mod, PyObject *filename)
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125 {
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126 PyFutureFeatures *ff;
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127
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128 ff = (PyFutureFeatures *)PyObject_Malloc(sizeof(PyFutureFeatures));
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129 if (ff == NULL) {
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130 PyErr_NoMemory();
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131 return NULL;
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132 }
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133 ff->ff_features = 0;
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134 ff->ff_lineno = -1;
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135
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136 if (!future_parse(ff, mod, filename)) {
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137 PyObject_Free(ff);
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138 return NULL;
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139 }
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140 return ff;
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141 }
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142
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143
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144 PyFutureFeatures *
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145 PyFuture_FromAST(mod_ty mod, const char *filename_str)
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146 {
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147 PyFutureFeatures *ff;
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148 PyObject *filename;
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149
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150 filename = PyUnicode_DecodeFSDefault(filename_str);
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151 if (filename == NULL)
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152 return NULL;
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153 ff = PyFuture_FromASTObject(mod, filename);
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154 Py_DECREF(filename);
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155 return ff;
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156 }