Mercurial > cpython-lru_cache-weakref

annotate Python/import.c @ 595:f9cdeebfcb67 legacy-trunk

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New version from the net.
author Guido van Rossum <guido@python.org>
date Tue, 14 Jan 1992 18:42:23 +0000
parents cbcdfda05bc4
children 0ad5b35e3ad8
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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 /* Magic word to reject pre-0.9.4 .pyc files */
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41
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42 #define MAGIC 0x949494L
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43
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44 /* Define pathname separator used in file names */
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45
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46 #ifdef macintosh
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47 #define SEP ':'
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48 #endif
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49
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50 #ifdef MSDOS
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51 #define SEP '\\'
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52 #endif
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53
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54 #ifndef SEP
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55 #define SEP '/'
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56 #endif
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57
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58 static object *modules;
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59
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60 /* Forward */
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61 static int init_builtin PROTO((char *));
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62
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63 /* Initialization */
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64
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65 void
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66 initimport()
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67 {
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68 if ((modules = newdictobject()) == NULL)
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69 fatal("no mem for dictionary of modules");
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70 }
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71
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72 object *
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73 get_modules()
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74 {
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75 return modules;
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76 }
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78 object *
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79 add_module(name)
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80 char *name;
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81 {
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82 object *m;
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83 if ((m = dictlookup(modules, name)) != NULL && is_moduleobject(m))
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84 return m;
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85 m = newmoduleobject(name);
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86 if (m == NULL)
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87 return NULL;
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88 if (dictinsert(modules, name, m) != 0) {
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89 DECREF(m);
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90 return NULL;
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91 }
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92 DECREF(m); /* Yes, it still exists, in modules! */
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93 return m;
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94 }
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95
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96 static FILE *
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97 open_module(name, suffix, namebuf)
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98 char *name;
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99 char *suffix;
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100 char *namebuf; /* XXX No buffer overflow checks! */
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101 {
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102 object *path;
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103 FILE *fp;
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104
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105 path = sysget("path");
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106 if (path == NULL || !is_listobject(path)) {
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107 strcpy(namebuf, name);
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108 strcat(namebuf, suffix);
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109 fp = fopen(namebuf, "r");
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110 }
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111 else {
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112 int npath = getlistsize(path);
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113 int i;
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114 fp = NULL;
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115 for (i = 0; i < npath; i++) {
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116 object *v = getlistitem(path, i);
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117 int len;
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118 if (!is_stringobject(v))
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119 continue;
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120 strcpy(namebuf, getstringvalue(v));
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121 len = getstringsize(v);
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122 if (len > 0 && namebuf[len-1] != SEP)
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123 namebuf[len++] = SEP;
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124 strcpy(namebuf+len, name);
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125 strcat(namebuf, suffix);
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126 fp = fopen(namebuf, "r");
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127 if (fp != NULL)
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128 break;
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129 }
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130 }
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131 return fp;
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132 }
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133
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134 static object *
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135 get_module(m, name, m_ret)
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136 /*module*/object *m;
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137 char *name;
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138 object **m_ret;
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139 {
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140 codeobject *co = NULL;
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141 object *v, *d;
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142 FILE *fp, *fpc;
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143 node *n;
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144 int err;
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145 char namebuf[258];
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146 int namelen;
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147 long mtime;
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148 extern long getmtime();
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149
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150 fp = open_module(name, ".py", namebuf);
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151 if (fp == NULL) {
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152 if (m == NULL) {
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153 sprintf(namebuf, "no module named %.200s", name);
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154 err_setstr(ImportError, namebuf);
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155 }
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156 else {
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157 sprintf(namebuf, "no source for module %.200s", name);
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158 err_setstr(ImportError, namebuf);
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159 }
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160 return NULL;
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161 }
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162 /* Get mtime -- always useful */
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163 mtime = getmtime(namebuf);
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164 /* Check ".pyc" file first */
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165 namelen = strlen(namebuf);
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166 namebuf[namelen] = 'c';
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167 namebuf[namelen+1] = '\0';
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168 fpc = fopen(namebuf, "rb");
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169 if (fpc != NULL) {
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170 long pyc_mtime;
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171 long magic;
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172 magic = rd_long(fpc);
263
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173 pyc_mtime = rd_long(fpc);
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174 if (magic == MAGIC && pyc_mtime == mtime && mtime != 0 && mtime != -1) {
263
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175 v = rd_object(fpc);
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176 if (v == NULL || err_occurred() || !is_codeobject(v)) {
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177 err_clear();
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178 XDECREF(v);
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179 }
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180 else
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181 co = (codeobject *)v;
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182 }
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183 fclose(fpc);
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184 }
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185 namebuf[namelen] = '\0';
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186 if (co == NULL)
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187 err = parse_file(fp, namebuf, file_input, &n);
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188 else
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189 err = E_DONE;
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190 fclose(fp);
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191 if (err != E_DONE) {
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192 err_input(err);
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193 return NULL;
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194 }
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195 if (m == NULL) {
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196 m = add_module(name);
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197 if (m == NULL) {
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198 freetree(n);
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199 return NULL;
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200 }
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201 *m_ret = m;
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202 }
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203 d = getmoduledict(m);
263
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204 if (co == NULL) {
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205 co = compile(n, namebuf);
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206 freetree(n);
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207 if (co == NULL)
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208 return NULL;
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209 /* Now write the code object to the ".pyc" file */
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210 namebuf[namelen] = 'c';
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211 namebuf[namelen+1] = '\0';
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212 fpc = fopen(namebuf, "wb");
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213 if (fpc != NULL) {
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214 wr_long(MAGIC, fpc);
263
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215 /* First write a 0 for mtime */
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216 wr_long(0L, fpc);
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217 wr_object((object *)co, fpc);
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218 if (ferror(fpc)) {
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219 /* Don't keep partial file */
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220 fclose(fpc);
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221 (void) unlink(namebuf);
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222 }
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223 else {
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224 /* Now write the true mtime */
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225 fseek(fpc, 4L, 0);
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226 wr_long(mtime, fpc);
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227 fflush(fpc);
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228 fclose(fpc);
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229 }
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230 }
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231 }
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232 v = eval_code(co, d, d, (object *)NULL);
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233 DECREF(co);
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234 return v;
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235 }
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236
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237 static object *
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238 load_module(name)
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239 char *name;
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240 {
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241 object *m, *v;
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242 v = get_module((object *)NULL, name, &m);
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243 if (v == NULL)
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244 return NULL;
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245 DECREF(v);
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246 return m;
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247 }
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248
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249 object *
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250 import_module(name)
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251 char *name;
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252 {
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253 object *m;
141
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diff changeset
254 if ((m = dictlookup(modules, name)) == NULL) {
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255 if (init_builtin(name)) {
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256 if ((m = dictlookup(modules, name)) == NULL)
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257 err_setstr(SystemError, "builtin module missing");
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diff changeset
258 }
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diff changeset
259 else {
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260 m = load_module(name);
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diff changeset
261 }
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diff changeset
262 }
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263 return m;
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264 }
40
f28ac7f621c7 Added reload() functionality.
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265
f28ac7f621c7 Added reload() functionality.
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266 object *
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267 reload_module(m)
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f28ac7f621c7 Added reload() functionality.
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diff changeset
268 object *m;
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269 {
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270 if (m == NULL || !is_moduleobject(m)) {
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271 err_setstr(TypeError, "reload() argument must be module");
40
f28ac7f621c7 Added reload() functionality.
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diff changeset
272 return NULL;
f28ac7f621c7 Added reload() functionality.
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diff changeset
273 }
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274 /* XXX Ought to check for builtin modules -- can't reload these... */
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275 return get_module(m, getmodulename(m), (object **)NULL);
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276 }
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277
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278 static void
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279 cleardict(d)
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280 object *d;
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281 {
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282 int i;
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283 for (i = getdictsize(d); --i >= 0; ) {
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284 char *k;
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285 k = getdictkey(d, i);
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286 if (k != NULL)
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diff changeset
287 (void) dictremove(d, k);
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diff changeset
288 }
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diff changeset
289 }
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290
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291 void
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diff changeset
292 doneimport()
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293 {
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294 if (modules != NULL) {
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295 int i;
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296 /* Explicitly erase all modules; this is the safest way
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297 to get rid of at least *some* circular dependencies */
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298 for (i = getdictsize(modules); --i >= 0; ) {
340
e3941efd7310 Use more dict2 functions./
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diff changeset
299 object *k;
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diff changeset
300 k = getdict2key(modules, i);
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301 if (k != NULL) {
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302 object *m;
340
e3941efd7310 Use more dict2 functions./
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diff changeset
303 m = dict2lookup(modules, k);
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diff changeset
304 if (m == NULL)
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diff changeset
305 err_clear();
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diff changeset
306 else if (is_moduleobject(m)) {
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307 object *d;
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308 d = getmoduledict(m);
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309 if (d != NULL && is_dictobject(d)) {
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310 cleardict(d);
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311 }
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312 }
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313 }
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314 }
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315 cleardict(modules);
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diff changeset
316 }
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317 DECREF(modules);
a6934380c6e7 "Compiling" version
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diff changeset
318 }
141
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319
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320
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321 /* Initialize built-in modules when first imported */
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322
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323 extern struct {
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324 char *name;
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325 void (*initfunc)();
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326 } inittab[];
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327
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328 static int
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329 init_builtin(name)
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330 char *name;
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331 {
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332 int i;
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333 for (i = 0; inittab[i].name != NULL; i++) {
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334 if (strcmp(name, inittab[i].name) == 0) {
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335 (*inittab[i].initfunc)();
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336 return 1;
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337 }
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338 }
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339 return 0;
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340 }