Mercurial > cpython-lru_cache-weakref

annotate Python/import.c @ 340:e3941efd7310 legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Use more dict2 functions./
author Guido van Rossum <guido@python.org>
date Fri, 16 Aug 1991 09:01:08 +0000
parents f900b692b37e
children 77b80a91d357
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1 /***********************************************************
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2 Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
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3 Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI not be used in advertising or publicity pertaining to
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13 distribution of the software without specific, written prior permission.
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14
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15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 ******************************************************************/
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24
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25 /* Module definition and import implementation */
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26
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27 #include "allobjects.h"
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28
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29 #include "node.h"
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30 #include "token.h"
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31 #include "graminit.h"
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32 #include "import.h"
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33 #include "errcode.h"
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34 #include "sysmodule.h"
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35 #include "pythonrun.h"
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36 #include "marshal.h"
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37 #include "compile.h"
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38 #include "ceval.h"
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39
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40 /* Define pathname separator used in file names */
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41
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42 #ifdef macintosh
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43 #define SEP ':'
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44 #endif
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45
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46 #ifdef MSDOS
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47 #define SEP '\\'
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48 #endif
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49
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50 #ifndef SEP
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51 #define SEP '/'
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52 #endif
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53
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54 static object *modules;
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55
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56 /* Forward */
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57 static int init_builtin PROTO((char *));
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58
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59 /* Initialization */
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60
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61 void
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62 initimport()
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63 {
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64 if ((modules = newdictobject()) == NULL)
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65 fatal("no mem for dictionary of modules");
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66 }
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67
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68 object *
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69 get_modules()
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70 {
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71 return modules;
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72 }
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73
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74 object *
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75 add_module(name)
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76 char *name;
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77 {
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78 object *m;
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79 if ((m = dictlookup(modules, name)) != NULL && is_moduleobject(m))
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80 return m;
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81 m = newmoduleobject(name);
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82 if (m == NULL)
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83 return NULL;
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84 if (dictinsert(modules, name, m) != 0) {
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85 DECREF(m);
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86 return NULL;
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87 }
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88 DECREF(m); /* Yes, it still exists, in modules! */
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89 return m;
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90 }
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91
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92 static FILE *
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93 open_module(name, suffix, namebuf)
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94 char *name;
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95 char *suffix;
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96 char *namebuf; /* XXX No buffer overflow checks! */
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97 {
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98 object *path;
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99 FILE *fp;
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100
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101 path = sysget("path");
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102 if (path == NULL || !is_listobject(path)) {
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103 strcpy(namebuf, name);
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104 strcat(namebuf, suffix);
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105 fp = fopen(namebuf, "r");
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106 }
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107 else {
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108 int npath = getlistsize(path);
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109 int i;
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110 fp = NULL;
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111 for (i = 0; i < npath; i++) {
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112 object *v = getlistitem(path, i);
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113 int len;
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114 if (!is_stringobject(v))
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115 continue;
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116 strcpy(namebuf, getstringvalue(v));
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117 len = getstringsize(v);
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118 if (len > 0 && namebuf[len-1] != SEP)
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119 namebuf[len++] = SEP;
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120 strcpy(namebuf+len, name);
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121 strcat(namebuf, suffix);
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122 fp = fopen(namebuf, "r");
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123 if (fp != NULL)
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124 break;
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125 }
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126 }
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127 return fp;
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128 }
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130 static object *
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131 get_module(m, name, m_ret)
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132 /*module*/object *m;
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133 char *name;
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134 object **m_ret;
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135 {
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136 codeobject *co = NULL;
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137 object *v, *d;
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138 FILE *fp, *fpc;
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139 node *n;
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140 int err;
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141 char namebuf[258];
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142 int namelen;
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143 long mtime;
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144 extern long getmtime();
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145
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146 fp = open_module(name, ".py", namebuf);
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147 if (fp == NULL) {
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148 if (m == NULL)
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149 err_setstr(NameError, name);
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150 else
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151 err_setstr(RuntimeError, "no module source file");
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152 return NULL;
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153 }
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154 /* Get mtime -- always useful */
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155 mtime = getmtime(namebuf);
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156 /* Check ".pyc" file first */
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157 namelen = strlen(namebuf);
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158 namebuf[namelen] = 'c';
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159 namebuf[namelen+1] = '\0';
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160 fpc = fopen(namebuf, "rb");
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161 if (fpc != NULL) {
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162 long pyc_mtime;
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163 (void) rd_long(fpc); /* Reserved for magic word */
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164 pyc_mtime = rd_long(fpc);
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165 if (pyc_mtime != 0 && pyc_mtime != -1 && pyc_mtime == mtime) {
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166 v = rd_object(fpc);
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167 if (v == NULL || err_occurred() || !is_codeobject(v)) {
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168 err_clear();
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169 XDECREF(v);
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170 }
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171 else
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172 co = (codeobject *)v;
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173 }
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174 fclose(fpc);
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175 }
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176 namebuf[namelen] = '\0';
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177 if (co == NULL)
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178 err = parse_file(fp, namebuf, file_input, &n);
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179 else
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180 err = E_DONE;
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181 fclose(fp);
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182 if (err != E_DONE) {
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183 err_input(err);
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184 return NULL;
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185 }
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186 if (m == NULL) {
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187 m = add_module(name);
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188 if (m == NULL) {
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189 freetree(n);
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190 return NULL;
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191 }
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192 *m_ret = m;
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193 }
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194 d = getmoduledict(m);
263
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195 if (co == NULL) {
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196 co = compile(n, namebuf);
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197 freetree(n);
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198 if (co == NULL)
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199 return NULL;
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200 /* Now write the code object to the ".pyc" file */
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201 namebuf[namelen] = 'c';
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202 namebuf[namelen+1] = '\0';
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203 fpc = fopen(namebuf, "wb");
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204 if (fpc != NULL) {
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205 wr_long(0L, fpc); /* Reserved for magic word */
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206 /* First write a 0 for mtime */
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207 wr_long(0L, fpc);
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208 wr_object((object *)co, fpc);
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209 if (ferror(fpc)) {
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210 /* Don't keep partial file */
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211 fclose(fpc);
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212 (void) unlink(namebuf);
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213 }
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214 else {
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215 /* Now write the true mtime */
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216 fseek(fpc, 4L, 0);
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217 wr_long(mtime, fpc);
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218 fflush(fpc);
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219 fclose(fpc);
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220 }
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221 }
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222 }
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223 v = eval_code(co, d, d, (object *)NULL);
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224 DECREF(co);
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225 return v;
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226 }
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227
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228 static object *
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229 load_module(name)
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230 char *name;
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231 {
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232 object *m, *v;
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233 v = get_module((object *)NULL, name, &m);
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234 if (v == NULL)
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235 return NULL;
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236 DECREF(v);
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237 return m;
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238 }
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239
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240 object *
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241 import_module(name)
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242 char *name;
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243 {
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244 object *m;
141
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245 if ((m = dictlookup(modules, name)) == NULL) {
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246 if (init_builtin(name)) {
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247 if ((m = dictlookup(modules, name)) == NULL)
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248 err_setstr(SystemError, "builtin module missing");
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249 }
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250 else {
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251 m = load_module(name);
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252 }
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253 }
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254 return m;
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255 }
40
f28ac7f621c7 Added reload() functionality.
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256
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257 object *
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258 reload_module(m)
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259 object *m;
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260 {
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261 if (m == NULL || !is_moduleobject(m)) {
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262 err_setstr(TypeError, "reload() argument must be module");
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263 return NULL;
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264 }
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265 /* XXX Ought to check for builtin modules -- can't reload these... */
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266 return get_module(m, getmodulename(m), (object **)NULL);
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267 }
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268
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269 static void
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270 cleardict(d)
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271 object *d;
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272 {
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273 int i;
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274 for (i = getdictsize(d); --i >= 0; ) {
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275 char *k;
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276 k = getdictkey(d, i);
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277 if (k != NULL)
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278 (void) dictremove(d, k);
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279 }
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280 }
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281
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282 void
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283 doneimport()
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284 {
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285 if (modules != NULL) {
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286 int i;
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287 /* Explicitly erase all modules; this is the safest way
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288 to get rid of at least *some* circular dependencies */
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289 for (i = getdictsize(modules); --i >= 0; ) {
340
e3941efd7310 Use more dict2 functions./
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290 object *k;
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291 k = getdict2key(modules, i);
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292 if (k != NULL) {
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293 object *m;
340
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diff changeset
294 m = dict2lookup(modules, k);
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295 if (m == NULL)
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diff changeset
296 err_clear();
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297 else if (is_moduleobject(m)) {
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298 object *d;
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299 d = getmoduledict(m);
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300 if (d != NULL && is_dictobject(d)) {
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301 cleardict(d);
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302 }
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303 }
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304 }
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305 }
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306 cleardict(modules);
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307 }
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308 DECREF(modules);
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309 }
141
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310
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311
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312 /* Initialize built-in modules when first imported */
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313
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diff changeset
314 extern struct {
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315 char *name;
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316 void (*initfunc)();
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317 } inittab[];
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318
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319 static int
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320 init_builtin(name)
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321 char *name;
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322 {
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323 int i;
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324 for (i = 0; inittab[i].name != NULL; i++) {
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325 if (strcmp(name, inittab[i].name) == 0) {
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326 (*inittab[i].initfunc)();
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327 return 1;
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328 }
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329 }
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330 return 0;
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331 }