Mercurial > cpython-lru_cache-weakref

annotate Python/future.c @ 50616:fc0000682bfe legacy-trunk

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Issue #1180193: When importing a module from a .pyc (or .pyo) file with an existing .py counterpart, override the co_filename attributes of all code objects if the original filename is obsolete (which can happen if the file has been renamed, moved, or if it is accessed through different paths). Patch by Ziga Seilnacht and Jean-Paul Calderone.
author Antoine Pitrou <solipsis@pitrou.net>
date Tue, 06 Jan 2009 18:10:47 +0000
parents 96418f812f06
children fd25030223b0
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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 "compile.h"
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8 #include "symtable.h"
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9
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10 #define UNDEFINED_FUTURE_FEATURE "future feature %.100s is not defined"
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11 #define ERR_LATE_FUTURE \
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12 "from __future__ imports must occur at the beginning of the file"
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13
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14 static int
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15 future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
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16 {
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17 int i;
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18 asdl_seq *names;
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19
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20 assert(s->kind == ImportFrom_kind);
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21
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22 names = s->v.ImportFrom.names;
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23 for (i = 0; i < asdl_seq_LEN(names); i++) {
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24 alias_ty name = (alias_ty)asdl_seq_GET(names, i);
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25 const char *feature = PyString_AsString(name->name);
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26 if (!feature)
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27 return 0;
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28 if (strcmp(feature, FUTURE_NESTED_SCOPES) == 0) {
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29 continue;
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30 } else if (strcmp(feature, FUTURE_GENERATORS) == 0) {
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31 continue;
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32 } else if (strcmp(feature, FUTURE_DIVISION) == 0) {
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33 ff->ff_features |= CO_FUTURE_DIVISION;
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34 } else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) {
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35 ff->ff_features |= CO_FUTURE_ABSOLUTE_IMPORT;
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36 } else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
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37 ff->ff_features |= CO_FUTURE_WITH_STATEMENT;
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38 } else if (strcmp(feature, FUTURE_PRINT_FUNCTION) == 0) {
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39 ff->ff_features |= CO_FUTURE_PRINT_FUNCTION;
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40 } else if (strcmp(feature, FUTURE_UNICODE_LITERALS) == 0) {
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41 ff->ff_features |= CO_FUTURE_UNICODE_LITERALS;
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42 } else if (strcmp(feature, "braces") == 0) {
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43 PyErr_SetString(PyExc_SyntaxError,
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44 "not a chance");
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45 PyErr_SyntaxLocation(filename, s->lineno);
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46 return 0;
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47 } else {
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48 PyErr_Format(PyExc_SyntaxError,
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49 UNDEFINED_FUTURE_FEATURE, feature);
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50 PyErr_SyntaxLocation(filename, s->lineno);
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51 return 0;
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52 }
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53 }
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54 return 1;
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55 }
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56
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57 static int
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58 future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
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59 {
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60 int i, found_docstring = 0, done = 0, prev_line = 0;
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61
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62 static PyObject *future;
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63 if (!future) {
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64 future = PyString_InternFromString("__future__");
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65 if (!future)
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66 return 0;
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67 }
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68
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69 if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
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70 return 1;
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71
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72 /* A subsequent pass will detect future imports that don't
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73 appear at the beginning of the file. There's one case,
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74 however, that is easier to handle here: A series of imports
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75 joined by semi-colons, where the first import is a future
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76 statement but some subsequent import has the future form
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77 but is preceded by a regular import.
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78 */
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79
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80
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81 for (i = 0; i < asdl_seq_LEN(mod->v.Module.body); i++) {
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82 stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
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83
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84 if (done && s->lineno > prev_line)
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85 return 1;
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86 prev_line = s->lineno;
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87
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88 /* The tests below will return from this function unless it is
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89 still possible to find a future statement. The only things
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90 that can precede a future statement are another future
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91 statement and a doc string.
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92 */
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93
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94 if (s->kind == ImportFrom_kind) {
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95 if (s->v.ImportFrom.module == future) {
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96 if (done) {
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97 PyErr_SetString(PyExc_SyntaxError,
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98 ERR_LATE_FUTURE);
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99 PyErr_SyntaxLocation(filename,
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100 s->lineno);
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101 return 0;
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102 }
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103 if (!future_check_features(ff, s, filename))
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104 return 0;
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105 ff->ff_lineno = s->lineno;
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106 }
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107 else
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108 done = 1;
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109 }
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110 else if (s->kind == Expr_kind && !found_docstring) {
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111 expr_ty e = s->v.Expr.value;
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112 if (e->kind != Str_kind)
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113 done = 1;
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114 else
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115 found_docstring = 1;
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116 }
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117 else
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118 done = 1;
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119 }
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120 return 1;
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121 }
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122
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123
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124 PyFutureFeatures *
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125 PyFuture_FromAST(mod_ty mod, const char *filename)
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126 {
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127 PyFutureFeatures *ff;
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128
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129 ff = (PyFutureFeatures *)PyObject_Malloc(sizeof(PyFutureFeatures));
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130 if (ff == NULL) {
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131 PyErr_NoMemory();
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132 return NULL;
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133 }
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134 ff->ff_features = 0;
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135 ff->ff_lineno = -1;
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136
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137 if (!future_parse(ff, mod, filename)) {
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138 PyObject_Free(ff);
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139 return NULL;
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140 }
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141 return ff;
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142 }