Mercurial > cpython-lru_cache-weakref
annotate Python/pythonmain.c @ 95:a5bf7d5959ce legacy-trunk
Return -1 for errors.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Thu, 20 Dec 1990 23:12:40 +0000 |
| parents | dac8625c8d9b |
| children | 853b736a6a9e |
| rev | line source |
|---|---|
| 6 | 1 /* Python interpreter main program */ |
| 2 | |
| 86 | 3 #include "allobjects.h" |
| 6 | 4 |
| 5 #include "grammar.h" | |
| 6 #include "node.h" | |
| 7 #include "parsetok.h" | |
| 8 #include "graminit.h" | |
| 9 #include "errcode.h" | |
| 10 #include "sysmodule.h" | |
| 86 | 11 #include "compile.h" |
| 12 #include "ceval.h" | |
| 13 #include "pythonrun.h" | |
| 14 #include "import.h" | |
| 15 | |
| 16 extern char *getpythonpath(); | |
| 6 | 17 |
| 18 extern grammar gram; /* From graminit.c */ | |
| 19 | |
| 86 | 20 #ifdef DEBUG |
| 21 int debugging; /* Needed by parser.c */ | |
| 22 #endif | |
| 6 | 23 |
| 24 main(argc, argv) | |
| 25 int argc; | |
| 26 char **argv; | |
| 27 { | |
| 28 char *filename = NULL; | |
| 29 FILE *fp = stdin; | |
| 86 | 30 |
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31 initargs(&argc, &argv); |
| 6 | 32 |
| 33 if (argc > 1 && strcmp(argv[1], "-") != 0) | |
| 34 filename = argv[1]; | |
| 86 | 35 |
| 6 | 36 if (filename != NULL) { |
| 37 if ((fp = fopen(filename, "r")) == NULL) { | |
| 38 fprintf(stderr, "python: can't open file '%s'\n", | |
| 39 filename); | |
| 40 exit(2); | |
| 41 } | |
| 42 } | |
| 43 | |
| 86 | 44 initall(); |
| 45 | |
| 46 setpythonpath(getpythonpath()); | |
| 47 setpythonargv(argc-1, argv+1); | |
| 6 | 48 |
| 86 | 49 goaway(run(fp, filename == NULL ? "<stdin>" : filename)); |
| 50 /*NOTREACHED*/ | |
| 51 } | |
| 52 | |
| 53 /* Initialize all */ | |
| 54 | |
| 55 void | |
| 56 initall() | |
| 57 { | |
| 58 static int inited; | |
| 59 | |
| 60 if (inited) | |
| 61 return; | |
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Changes for THINK C 4.0.
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62 inited = 1; |
| 86 | 63 |
| 64 initimport(); | |
| 65 | |
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66 /* Modules 'builtin' and 'sys' are initialized here, |
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67 they are needed by random bits of the interpreter. |
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parents:
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68 All other modules are optional and should be initialized |
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Changes for THINK C 4.0.
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parents:
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69 by the initcalls() of a specific configuration. */ |
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dac8625c8d9b
Changes for THINK C 4.0.
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parents:
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diff
changeset
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70 |
| 86 | 71 initbuiltin(); /* Also initializes builtin exceptions */ |
| 72 initsys(); | |
| 6 | 73 |
| 86 | 74 initcalls(); /* Configuration-dependent initializations */ |
| 75 | |
| 76 initintr(); /* For intrcheck() */ | |
| 77 } | |
| 78 | |
| 79 /* Parse input from a file and execute it */ | |
| 80 | |
| 81 int | |
| 82 run(fp, filename) | |
| 83 FILE *fp; | |
| 84 char *filename; | |
| 85 { | |
| 86 if (filename == NULL) | |
| 87 filename = "???"; | |
| 88 if (isatty(fileno(fp))) | |
| 89 return run_tty_loop(fp, filename); | |
| 90 else | |
| 91 return run_script(fp, filename); | |
| 92 } | |
| 93 | |
| 94 int | |
| 95 run_tty_loop(fp, filename) | |
| 96 FILE *fp; | |
| 97 char *filename; | |
| 98 { | |
| 99 object *v; | |
| 100 int ret; | |
| 101 v = sysget("ps1"); | |
| 102 if (v == NULL) { | |
| 103 sysset("ps1", v = newstringobject(">>> ")); | |
| 104 XDECREF(v); | |
| 105 } | |
| 106 v = sysget("ps2"); | |
| 107 if (v == NULL) { | |
| 108 sysset("ps2", v = newstringobject("... ")); | |
| 109 XDECREF(v); | |
| 110 } | |
| 111 for (;;) { | |
| 112 ret = run_tty_1(fp, filename); | |
| 113 #ifdef REF_DEBUG | |
| 114 fprintf(stderr, "[%ld refs]\n", ref_total); | |
| 115 #endif | |
| 116 if (ret == E_EOF) | |
| 117 return 0; | |
| 118 /* | |
| 119 if (ret == E_NOMEM) | |
| 120 return -1; | |
| 121 */ | |
| 122 } | |
| 123 } | |
| 124 | |
| 125 int | |
| 126 run_tty_1(fp, filename) | |
| 127 FILE *fp; | |
| 128 char *filename; | |
| 129 { | |
| 130 object *m, *d, *v, *w; | |
| 131 node *n; | |
| 132 char *ps1, *ps2; | |
| 133 int err; | |
| 134 v = sysget("ps1"); | |
| 135 w = sysget("ps2"); | |
| 136 if (v != NULL && is_stringobject(v)) { | |
| 137 INCREF(v); | |
| 138 ps1 = getstringvalue(v); | |
| 139 } | |
| 140 else { | |
| 141 v = NULL; | |
| 142 ps1 = ""; | |
| 143 } | |
| 144 if (w != NULL && is_stringobject(w)) { | |
| 145 INCREF(w); | |
| 146 ps2 = getstringvalue(w); | |
| 6 | 147 } |
| 148 else { | |
| 86 | 149 w = NULL; |
| 150 ps2 = ""; | |
| 151 } | |
| 152 err = parsefile(fp, filename, &gram, single_input, ps1, ps2, &n); | |
| 153 XDECREF(v); | |
| 154 XDECREF(w); | |
| 155 if (err == E_EOF) | |
| 156 return E_EOF; | |
| 157 if (err != E_DONE) { | |
| 158 err_input(err); | |
| 159 print_error(); | |
| 160 return err; | |
| 161 } | |
| 162 m = add_module("__main__"); | |
| 163 if (m == NULL) | |
| 164 return -1; | |
| 165 d = getmoduledict(m); | |
| 166 v = run_node(n, filename, d, d); | |
| 167 flushline(); | |
| 168 if (v == NULL) { | |
| 169 print_error(); | |
| 170 return -1; | |
| 171 } | |
| 172 DECREF(v); | |
| 173 return 0; | |
| 174 } | |
| 175 | |
| 176 int | |
| 177 run_script(fp, filename) | |
| 178 FILE *fp; | |
| 179 char *filename; | |
| 180 { | |
| 181 object *m, *d, *v; | |
| 182 m = add_module("__main__"); | |
| 183 if (m == NULL) | |
| 184 return -1; | |
| 185 d = getmoduledict(m); | |
| 186 v = run_file(fp, filename, file_input, d, d); | |
| 187 flushline(); | |
| 188 if (v == NULL) { | |
| 189 print_error(); | |
| 190 return -1; | |
| 6 | 191 } |
| 86 | 192 DECREF(v); |
| 193 return 0; | |
| 194 } | |
| 195 | |
| 196 void | |
| 197 print_error() | |
| 198 { | |
| 199 object *exception, *v; | |
| 200 err_get(&exception, &v); | |
| 201 fprintf(stderr, "Unhandled exception: "); | |
| 202 printobject(exception, stderr, PRINT_RAW); | |
| 203 if (v != NULL && v != None) { | |
| 204 fprintf(stderr, ": "); | |
| 205 printobject(v, stderr, PRINT_RAW); | |
| 206 } | |
| 207 fprintf(stderr, "\n"); | |
| 208 XDECREF(exception); | |
| 209 XDECREF(v); | |
| 210 printtraceback(stderr); | |
| 211 } | |
| 212 | |
| 213 object * | |
| 214 run_string(str, start, globals, locals) | |
| 215 char *str; | |
| 216 int start; | |
| 217 /*dict*/object *globals, *locals; | |
| 218 { | |
| 219 node *n; | |
| 220 int err; | |
| 221 err = parse_string(str, start, &n); | |
| 222 return run_err_node(err, n, "<string>", globals, locals); | |
| 223 } | |
| 224 | |
| 225 object * | |
| 226 run_file(fp, filename, start, globals, locals) | |
| 227 FILE *fp; | |
| 228 char *filename; | |
| 229 int start; | |
| 230 /*dict*/object *globals, *locals; | |
| 231 { | |
| 232 node *n; | |
| 233 int err; | |
| 234 err = parse_file(fp, filename, start, &n); | |
| 235 return run_err_node(err, n, filename, globals, locals); | |
| 6 | 236 } |
| 237 | |
| 86 | 238 object * |
| 239 run_err_node(err, n, filename, globals, locals) | |
| 240 int err; | |
| 241 node *n; | |
| 242 char *filename; | |
| 243 /*dict*/object *globals, *locals; | |
| 244 { | |
| 245 if (err != E_DONE) { | |
| 246 err_input(err); | |
| 247 return NULL; | |
| 248 } | |
| 249 return run_node(n, filename, globals, locals); | |
| 250 } | |
| 251 | |
| 252 object * | |
| 253 run_node(n, filename, globals, locals) | |
| 254 node *n; | |
| 255 char *filename; | |
| 256 /*dict*/object *globals, *locals; | |
| 257 { | |
| 258 if (globals == NULL) { | |
| 259 globals = getglobals(); | |
| 260 if (locals == NULL) | |
| 261 locals = getlocals(); | |
| 262 } | |
| 263 else { | |
| 264 if (locals == NULL) | |
| 265 locals = globals; | |
| 266 } | |
| 267 return eval_node(n, filename, globals, locals); | |
| 268 } | |
| 269 | |
| 270 object * | |
| 271 eval_node(n, filename, globals, locals) | |
| 272 node *n; | |
| 273 char *filename; | |
| 274 object *globals; | |
| 275 object *locals; | |
| 276 { | |
| 277 codeobject *co; | |
| 278 object *v; | |
| 279 co = compile(n, filename); | |
| 280 freetree(n); | |
| 281 if (co == NULL) | |
| 282 return NULL; | |
| 283 v = eval_code(co, globals, locals, (object *)NULL); | |
| 284 DECREF(co); | |
| 285 return v; | |
| 286 } | |
| 287 | |
| 288 /* Simplified interface to parsefile */ | |
| 289 | |
| 290 int | |
| 291 parse_file(fp, filename, start, n_ret) | |
| 292 FILE *fp; | |
| 293 char *filename; | |
| 294 int start; | |
| 295 node **n_ret; | |
| 296 { | |
| 297 return parsefile(fp, filename, &gram, start, | |
| 298 (char *)0, (char *)0, n_ret); | |
| 299 } | |
| 300 | |
| 301 /* Simplified interface to parsestring */ | |
| 302 | |
| 303 int | |
| 304 parse_string(str, start, n_ret) | |
| 305 char *str; | |
| 306 int start; | |
| 307 node **n_ret; | |
| 308 { | |
| 309 int err = parsestring(str, &gram, start, n_ret); | |
| 310 /* Don't confuse early end of string with early end of input */ | |
| 311 if (err == E_EOF) | |
| 312 err = E_SYNTAX; | |
| 313 return err; | |
| 314 } | |
| 315 | |
| 316 /* Print fatal error message and abort */ | |
| 317 | |
| 318 void | |
| 319 fatal(msg) | |
| 320 char *msg; | |
| 321 { | |
| 322 fprintf(stderr, "Fatal error: %s\n", msg); | |
| 323 abort(); | |
| 324 } | |
| 325 | |
| 326 /* Clean up and exit */ | |
| 327 | |
| 328 void | |
| 6 | 329 goaway(sts) |
| 330 int sts; | |
| 331 { | |
| 86 | 332 flushline(); |
| 333 | |
| 334 /* XXX Call doneimport() before donecalls(), since donecalls() | |
| 335 calls wdone(), and doneimport() may close windows */ | |
| 336 doneimport(); | |
| 337 donecalls(); | |
| 338 | |
| 339 err_clear(); | |
| 340 | |
| 341 #ifdef REF_DEBUG | |
| 342 fprintf(stderr, "[%ld refs]\n", ref_total); | |
| 343 #endif | |
| 344 | |
|
94
dac8625c8d9b
Changes for THINK C 4.0.
Guido van Rossum <guido@python.org>
parents:
86
diff
changeset
|
345 #ifdef THINK_C_3_0 |
| 6 | 346 if (sts == 0) |
| 347 Click_On(0); | |
| 348 #endif | |
| 86 | 349 |
| 350 #ifdef TRACE_REFS | |
| 351 if (askyesno("Print left references?")) { | |
|
94
dac8625c8d9b
Changes for THINK C 4.0.
Guido van Rossum <guido@python.org>
parents:
86
diff
changeset
|
352 #ifdef THINK_C_3_0 |
| 86 | 353 Click_On(1); |
| 354 #endif | |
| 355 printrefs(stderr); | |
| 356 } | |
| 357 #endif /* TRACE_REFS */ | |
| 358 | |
| 6 | 359 exit(sts); |
| 360 /*NOTREACHED*/ | |
| 361 } | |
| 362 | |
| 86 | 363 static |
| 364 finaloutput() | |
| 6 | 365 { |
| 86 | 366 #ifdef TRACE_REFS |
| 367 if (!askyesno("Print left references?")) | |
| 368 return; | |
|
94
dac8625c8d9b
Changes for THINK C 4.0.
Guido van Rossum <guido@python.org>
parents:
86
diff
changeset
|
369 #ifdef THINK_C_3_0 |
| 86 | 370 Click_On(1); |
|
94
dac8625c8d9b
Changes for THINK C 4.0.
Guido van Rossum <guido@python.org>
parents:
86
diff
changeset
|
371 #endif |
| 86 | 372 printrefs(stderr); |
| 373 #endif /* TRACE_REFS */ | |
| 6 | 374 } |
| 375 | |
| 376 /* Ask a yes/no question */ | |
| 377 | |
| 86 | 378 static int |
| 6 | 379 askyesno(prompt) |
| 380 char *prompt; | |
| 381 { | |
| 382 char buf[256]; | |
| 383 | |
| 384 printf("%s [ny] ", prompt); | |
| 385 if (fgets(buf, sizeof buf, stdin) == NULL) | |
| 386 return 0; | |
| 387 return buf[0] == 'y' || buf[0] == 'Y'; | |
| 388 } | |
| 389 | |
|
94
dac8625c8d9b
Changes for THINK C 4.0.
Guido van Rossum <guido@python.org>
parents:
86
diff
changeset
|
390 #ifdef THINK_C_3_0 |
|
70
a36c348a8e1a
Moved configuration-dependent initializations (etc.) to config_*.c
Guido van Rossum <guido@python.org>
parents:
16
diff
changeset
|
391 |
| 6 | 392 /* Check for file descriptor connected to interactive device. |
| 393 Pretend that stdin is always interactive, other files never. */ | |
| 394 | |
| 395 int | |
| 396 isatty(fd) | |
| 397 int fd; | |
| 398 { | |
| 399 return fd == fileno(stdin); | |
| 400 } | |
| 401 | |
| 402 #endif | |
| 403 | |
| 86 | 404 /* XXX WISH LIST |
| 6 | 405 |
| 406 - possible new types: | |
| 407 - iterator (for range, keys, ...) | |
| 408 - improve interpreter error handling, e.g., true tracebacks | |
| 409 - save precompiled modules on file? | |
| 410 - fork threads, locking | |
| 411 - allow syntax extensions | |
| 412 */ | |
| 86 | 413 |
| 414 /* "Floccinaucinihilipilification" */ |