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annotate Python/future.c @ 84648:92a9ccb2a521

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Issue #18408: add more assertions on PyErr_Occurred() in ceval.c to detect bugs earlier
author Victor Stinner <victor.stinner@gmail.com>
date Tue, 16 Jul 2013 01:02:12 +0200
parents 0e253370863f
children df2fdd42b375
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, const char *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_SyntaxLocationEx(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_SyntaxLocationEx(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, const char *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_SyntaxLocationEx(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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122
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123 PyFutureFeatures *
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124 PyFuture_FromAST(mod_ty mod, const char *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 }