Mercurial > cpython-lru_cache-weakref

annotate Python/future.c @ 45155:86602b603462 2.5

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backport of r60575 (issue #1750076): Debugger did not step on every iteration of a while statement. The mapping between bytecode offsets and source lines (lnotab) did not contain an entry for the beginning of the loop. Now it does, and the lnotab can be a bit larger: in particular, several statements on the same line generate several entries. However, this does not bother the settrace function, which will trigger only one 'line' event. The lnotab seems to be exactly the same as with python2.4.
author Amaury Forgeot d'Arc <amauryfa@gmail.com>
date Mon, 04 Feb 2008 22:34:57 +0000
parents 75a7106662a3
children f3c1f9c8ce9f
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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
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12 static int
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13 future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
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14 {
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15 int i;
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16 asdl_seq *names;
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17
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18 assert(s->kind == ImportFrom_kind);
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19
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20 names = s->v.ImportFrom.names;
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21 for (i = 0; i < asdl_seq_LEN(names); i++) {
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22 alias_ty name = (alias_ty)asdl_seq_GET(names, i);
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23 const char *feature = PyString_AsString(name->name);
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24 if (!feature)
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25 return 0;
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26 if (strcmp(feature, FUTURE_NESTED_SCOPES) == 0) {
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27 continue;
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28 } else if (strcmp(feature, FUTURE_GENERATORS) == 0) {
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29 continue;
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30 } else if (strcmp(feature, FUTURE_DIVISION) == 0) {
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31 ff->ff_features |= CO_FUTURE_DIVISION;
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32 } else if (strcmp(feature, FUTURE_ABSOLUTE_IMPORT) == 0) {
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33 ff->ff_features |= CO_FUTURE_ABSOLUTE_IMPORT;
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34 } else if (strcmp(feature, FUTURE_WITH_STATEMENT) == 0) {
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35 ff->ff_features |= CO_FUTURE_WITH_STATEMENT;
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36 } else if (strcmp(feature, "braces") == 0) {
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37 PyErr_SetString(PyExc_SyntaxError,
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38 "not a chance");
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39 PyErr_SyntaxLocation(filename, s->lineno);
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40 return 0;
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41 } else {
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42 PyErr_Format(PyExc_SyntaxError,
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43 UNDEFINED_FUTURE_FEATURE, feature);
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44 PyErr_SyntaxLocation(filename, s->lineno);
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45 return 0;
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46 }
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47 }
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48 return 1;
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49 }
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50
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51 static int
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52 future_parse(PyFutureFeatures *ff, mod_ty mod, const char *filename)
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53 {
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54 int i, found_docstring = 0, done = 0, prev_line = 0;
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55
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56 static PyObject *future;
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57 if (!future) {
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58 future = PyString_InternFromString("__future__");
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59 if (!future)
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60 return 0;
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61 }
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62
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63 if (!(mod->kind == Module_kind || mod->kind == Interactive_kind))
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64 return 1;
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65
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66 /* A subsequent pass will detect future imports that don't
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67 appear at the beginning of the file. There's one case,
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68 however, that is easier to handl here: A series of imports
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69 joined by semi-colons, where the first import is a future
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70 statement but some subsequent import has the future form
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71 but is preceded by a regular import.
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72 */
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73
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74
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75 for (i = 0; i < asdl_seq_LEN(mod->v.Module.body); i++) {
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76 stmt_ty s = (stmt_ty)asdl_seq_GET(mod->v.Module.body, i);
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77
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78 if (done && s->lineno > prev_line)
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79 return 1;
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80 prev_line = s->lineno;
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81
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82 /* The tests below will return from this function unless it is
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83 still possible to find a future statement. The only things
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84 that can precede a future statement are another future
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85 statement and a doc string.
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86 */
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87
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88 if (s->kind == ImportFrom_kind) {
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89 if (s->v.ImportFrom.module == future) {
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90 if (done) {
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91 PyErr_SetString(PyExc_SyntaxError,
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92 ERR_LATE_FUTURE);
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93 PyErr_SyntaxLocation(filename,
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94 s->lineno);
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95 return 0;
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96 }
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97 if (!future_check_features(ff, s, filename))
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98 return 0;
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99 ff->ff_lineno = s->lineno;
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100 }
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101 else
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102 done = 1;
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103 }
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104 else if (s->kind == Expr_kind && !found_docstring) {
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105 expr_ty e = s->v.Expr.value;
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106 if (e->kind != Str_kind)
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107 done = 1;
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108 else
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109 found_docstring = 1;
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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 return 1;
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115 }
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116
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117
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118 PyFutureFeatures *
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119 PyFuture_FromAST(mod_ty mod, const char *filename)
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120 {
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121 PyFutureFeatures *ff;
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122
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123 ff = (PyFutureFeatures *)PyObject_Malloc(sizeof(PyFutureFeatures));
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124 if (ff == NULL) {
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125 PyErr_NoMemory();
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126 return NULL;
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127 }
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128 ff->ff_features = 0;
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129 ff->ff_lineno = -1;
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130
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131 if (!future_parse(ff, mod, filename)) {
37558
286c81689826 Use PyObject_* allocator since FutureFeatures is small
Neal Norwitz <nnorwitz@gmail.com>
parents: 37418
diff changeset
132 PyObject_Free(ff);
16799
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
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133 return NULL;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
134 }
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
135 return ff;
08d937107fe6 Improved __future__ parser; still more to do
Jeremy Hylton <jeremy@alum.mit.edu>
parents:
diff changeset
136 }