Mercurial > cpython-lru_cache-weakref
annotate Python/compile.c @ 203:ceb36ec6198d legacy-trunk
BUGFIX! Instructions are unsigned bytes.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Tue, 16 Apr 1991 08:39:12 +0000 |
| parents | 229168a2fe28 |
| children | 7e83115edb6a |
| rev | line source |
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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 |
| 69 | 25 /* Compile an expression node to intermediate code */ |
| 26 | |
| 86 | 27 /* XXX TO DO: |
| 28 XXX Compute maximum needed stack sizes while compiling | |
| 29 XXX Generate simple jump for break/return outside 'try...finally' | |
| 30 XXX Include function name in code (and module names?) | |
| 31 */ | |
| 69 | 32 |
| 86 | 33 #include "allobjects.h" |
| 34 | |
| 69 | 35 #include "node.h" |
| 36 #include "token.h" | |
| 37 #include "graminit.h" | |
| 38 #include "compile.h" | |
| 39 #include "opcode.h" | |
| 86 | 40 #include "structmember.h" |
| 41 | |
| 42 #include <ctype.h> | |
| 43 | |
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44 extern int errno; |
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45 |
| 86 | 46 #define OFF(x) offsetof(codeobject, x) |
| 47 | |
| 48 static struct memberlist code_memberlist[] = { | |
| 49 {"co_code", T_OBJECT, OFF(co_code)}, | |
| 50 {"co_consts", T_OBJECT, OFF(co_consts)}, | |
| 51 {"co_names", T_OBJECT, OFF(co_names)}, | |
| 52 {"co_filename", T_OBJECT, OFF(co_filename)}, | |
| 53 {NULL} /* Sentinel */ | |
| 54 }; | |
| 55 | |
| 56 static object * | |
| 57 code_getattr(co, name) | |
| 58 codeobject *co; | |
| 59 char *name; | |
| 60 { | |
| 61 return getmember((char *)co, code_memberlist, name); | |
| 62 } | |
| 69 | 63 |
| 64 static void | |
| 86 | 65 code_dealloc(co) |
| 66 codeobject *co; | |
| 69 | 67 { |
| 86 | 68 XDECREF(co->co_code); |
| 69 XDECREF(co->co_consts); | |
| 70 XDECREF(co->co_names); | |
| 71 XDECREF(co->co_filename); | |
| 72 DEL(co); | |
| 69 | 73 } |
| 74 | |
| 75 typeobject Codetype = { | |
| 76 OB_HEAD_INIT(&Typetype) | |
| 77 0, | |
| 78 "code", | |
| 79 sizeof(codeobject), | |
| 80 0, | |
| 81 code_dealloc, /*tp_dealloc*/ | |
| 82 0, /*tp_print*/ | |
| 86 | 83 code_getattr, /*tp_getattr*/ |
| 69 | 84 0, /*tp_setattr*/ |
| 85 0, /*tp_compare*/ | |
| 86 0, /*tp_repr*/ | |
| 87 0, /*tp_as_number*/ | |
| 88 0, /*tp_as_sequence*/ | |
| 89 0, /*tp_as_mapping*/ | |
| 90 }; | |
| 91 | |
| 86 | 92 static codeobject *newcodeobject PROTO((object *, object *, object *, char *)); |
| 69 | 93 |
| 94 static codeobject * | |
| 86 | 95 newcodeobject(code, consts, names, filename) |
| 69 | 96 object *code; |
| 97 object *consts; | |
| 98 object *names; | |
| 86 | 99 char *filename; |
| 69 | 100 { |
| 101 codeobject *co; | |
| 102 int i; | |
| 103 /* Check argument types */ | |
| 104 if (code == NULL || !is_stringobject(code) || | |
| 105 consts == NULL || !is_listobject(consts) || | |
| 106 names == NULL || !is_listobject(names)) { | |
| 107 err_badcall(); | |
| 108 return NULL; | |
| 109 } | |
| 110 /* Make sure the list of names contains only strings */ | |
| 111 for (i = getlistsize(names); --i >= 0; ) { | |
| 112 object *v = getlistitem(names, i); | |
| 113 if (v == NULL || !is_stringobject(v)) { | |
| 114 err_badcall(); | |
| 115 return NULL; | |
| 116 } | |
| 117 } | |
| 118 co = NEWOBJ(codeobject, &Codetype); | |
| 119 if (co != NULL) { | |
| 120 INCREF(code); | |
| 121 co->co_code = (stringobject *)code; | |
| 122 INCREF(consts); | |
| 123 co->co_consts = consts; | |
| 124 INCREF(names); | |
| 125 co->co_names = names; | |
| 86 | 126 if ((co->co_filename = newstringobject(filename)) == NULL) { |
| 127 DECREF(co); | |
| 128 co = NULL; | |
| 129 } | |
| 69 | 130 } |
| 131 return co; | |
| 132 } | |
| 133 | |
| 134 | |
| 135 /* Data structure used internally */ | |
| 136 struct compiling { | |
| 137 object *c_code; /* string */ | |
| 138 object *c_consts; /* list of objects */ | |
| 139 object *c_names; /* list of strings (names) */ | |
| 140 int c_nexti; /* index into c_code */ | |
| 141 int c_errors; /* counts errors occurred */ | |
| 86 | 142 int c_infunction; /* set when compiling a function */ |
| 143 int c_loops; /* counts nested loops */ | |
| 144 char *c_filename; /* filename of current node */ | |
| 69 | 145 }; |
| 146 | |
| 147 /* Prototypes */ | |
| 86 | 148 static int com_init PROTO((struct compiling *, char *)); |
| 69 | 149 static void com_free PROTO((struct compiling *)); |
| 150 static void com_done PROTO((struct compiling *)); | |
| 151 static void com_node PROTO((struct compiling *, struct _node *)); | |
| 152 static void com_addbyte PROTO((struct compiling *, int)); | |
| 153 static void com_addint PROTO((struct compiling *, int)); | |
| 154 static void com_addoparg PROTO((struct compiling *, int, int)); | |
| 155 static void com_addfwref PROTO((struct compiling *, int, int *)); | |
| 156 static void com_backpatch PROTO((struct compiling *, int)); | |
| 157 static int com_add PROTO((struct compiling *, object *, object *)); | |
| 158 static int com_addconst PROTO((struct compiling *, object *)); | |
| 159 static int com_addname PROTO((struct compiling *, object *)); | |
| 160 static void com_addopname PROTO((struct compiling *, int, node *)); | |
| 161 | |
| 162 static int | |
| 86 | 163 com_init(c, filename) |
| 69 | 164 struct compiling *c; |
| 86 | 165 char *filename; |
| 69 | 166 { |
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167 if ((c->c_code = newsizedstringobject((char *)NULL, 1000)) == NULL) |
| 69 | 168 goto fail_3; |
| 169 if ((c->c_consts = newlistobject(0)) == NULL) | |
| 170 goto fail_2; | |
| 171 if ((c->c_names = newlistobject(0)) == NULL) | |
| 172 goto fail_1; | |
| 173 c->c_nexti = 0; | |
| 174 c->c_errors = 0; | |
| 86 | 175 c->c_infunction = 0; |
| 176 c->c_loops = 0; | |
| 177 c->c_filename = filename; | |
| 69 | 178 return 1; |
| 179 | |
| 180 fail_1: | |
| 181 DECREF(c->c_consts); | |
| 182 fail_2: | |
| 183 DECREF(c->c_code); | |
| 184 fail_3: | |
| 185 return 0; | |
| 186 } | |
| 187 | |
| 188 static void | |
| 189 com_free(c) | |
| 190 struct compiling *c; | |
| 191 { | |
| 192 XDECREF(c->c_code); | |
| 193 XDECREF(c->c_consts); | |
| 194 XDECREF(c->c_names); | |
| 195 } | |
| 196 | |
| 197 static void | |
| 198 com_done(c) | |
| 199 struct compiling *c; | |
| 200 { | |
| 201 if (c->c_code != NULL) | |
| 202 resizestring(&c->c_code, c->c_nexti); | |
| 203 } | |
| 204 | |
| 205 static void | |
| 206 com_addbyte(c, byte) | |
| 207 struct compiling *c; | |
| 208 int byte; | |
| 209 { | |
| 210 int len; | |
| 211 if (byte < 0 || byte > 255) { | |
| 86 | 212 fprintf(stderr, "XXX compiling bad byte: %d\n", byte); |
| 213 abort(); | |
| 69 | 214 err_setstr(SystemError, "com_addbyte: byte out of range"); |
| 215 c->c_errors++; | |
| 216 } | |
| 217 if (c->c_code == NULL) | |
| 218 return; | |
| 219 len = getstringsize(c->c_code); | |
| 220 if (c->c_nexti >= len) { | |
| 221 if (resizestring(&c->c_code, len+1000) != 0) { | |
| 222 c->c_errors++; | |
| 223 return; | |
| 224 } | |
| 225 } | |
| 226 getstringvalue(c->c_code)[c->c_nexti++] = byte; | |
| 227 } | |
| 228 | |
| 229 static void | |
| 230 com_addint(c, x) | |
| 231 struct compiling *c; | |
| 232 int x; | |
| 233 { | |
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234 com_addbyte(c, x & 0xff); |
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235 com_addbyte(c, x >> 8); /* XXX x should be positive */ |
| 69 | 236 } |
| 237 | |
| 238 static void | |
| 239 com_addoparg(c, op, arg) | |
| 240 struct compiling *c; | |
| 241 int op; | |
| 242 int arg; | |
| 243 { | |
| 244 com_addbyte(c, op); | |
| 245 com_addint(c, arg); | |
| 246 } | |
| 247 | |
| 248 static void | |
| 249 com_addfwref(c, op, p_anchor) | |
| 250 struct compiling *c; | |
| 251 int op; | |
| 252 int *p_anchor; | |
| 253 { | |
| 254 /* Compile a forward reference for backpatching */ | |
| 255 int here; | |
| 256 int anchor; | |
| 257 com_addbyte(c, op); | |
| 258 here = c->c_nexti; | |
| 259 anchor = *p_anchor; | |
| 260 *p_anchor = here; | |
| 261 com_addint(c, anchor == 0 ? 0 : here - anchor); | |
| 262 } | |
| 263 | |
| 264 static void | |
| 265 com_backpatch(c, anchor) | |
| 266 struct compiling *c; | |
| 267 int anchor; /* Must be nonzero */ | |
| 268 { | |
| 269 unsigned char *code = (unsigned char *) getstringvalue(c->c_code); | |
| 270 int target = c->c_nexti; | |
| 271 int lastanchor = 0; | |
| 272 int dist; | |
| 273 int prev; | |
| 274 for (;;) { | |
| 275 /* Make the JUMP instruction at anchor point to target */ | |
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276 prev = code[anchor] + (code[anchor+1] << 8); |
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277 dist = target - (anchor+2); |
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278 code[anchor] = dist & 0xff; |
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279 code[anchor+1] = dist >> 8; |
| 69 | 280 if (!prev) |
| 281 break; | |
| 282 lastanchor = anchor; | |
| 283 anchor -= prev; | |
| 284 } | |
| 285 } | |
| 286 | |
| 287 /* Handle constants and names uniformly */ | |
| 288 | |
| 289 static int | |
| 290 com_add(c, list, v) | |
| 291 struct compiling *c; | |
| 292 object *list; | |
| 293 object *v; | |
| 294 { | |
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295 int n = getlistsize(list); |
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296 int i; |
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297 for (i = n; --i >= 0; ) { |
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298 object *w = getlistitem(list, i); |
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299 if (cmpobject(v, w) == 0) |
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300 return i; |
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301 } |
| 69 | 302 if (addlistitem(list, v) != 0) |
| 303 c->c_errors++; | |
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304 return n; |
| 69 | 305 } |
| 306 | |
| 307 static int | |
| 308 com_addconst(c, v) | |
| 309 struct compiling *c; | |
| 310 object *v; | |
| 311 { | |
| 312 return com_add(c, c->c_consts, v); | |
| 313 } | |
| 314 | |
| 315 static int | |
| 316 com_addname(c, v) | |
| 317 struct compiling *c; | |
| 318 object *v; | |
| 319 { | |
| 320 return com_add(c, c->c_names, v); | |
| 321 } | |
| 322 | |
| 323 static void | |
| 324 com_addopname(c, op, n) | |
| 325 struct compiling *c; | |
| 326 int op; | |
| 327 node *n; | |
| 328 { | |
| 329 object *v; | |
| 330 int i; | |
| 331 char *name; | |
| 332 if (TYPE(n) == STAR) | |
| 333 name = "*"; | |
| 334 else { | |
| 335 REQ(n, NAME); | |
| 336 name = STR(n); | |
| 337 } | |
| 338 if ((v = newstringobject(name)) == NULL) { | |
| 339 c->c_errors++; | |
| 340 i = 255; | |
| 341 } | |
| 342 else { | |
| 343 i = com_addname(c, v); | |
| 344 DECREF(v); | |
| 345 } | |
| 346 com_addoparg(c, op, i); | |
| 347 } | |
| 348 | |
| 349 static object * | |
| 350 parsenumber(s) | |
| 351 char *s; | |
| 352 { | |
| 353 extern long strtol(); | |
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354 extern double strtod(); |
| 69 | 355 char *end = s; |
| 356 long x; | |
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357 double xx; |
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358 errno = 0; |
| 69 | 359 x = strtol(s, &end, 0); |
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360 if (*end == '\0') { |
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361 if (errno != 0) { |
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362 err_setstr(RuntimeError, "integer constant too large"); |
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363 return NULL; |
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364 } |
| 69 | 365 return newintobject(x); |
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366 } |
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367 errno = 0; |
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368 xx = strtod(s, &end); |
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369 if (*end == '\0') { |
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370 if (errno != 0) { |
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371 err_setstr(RuntimeError, "float constant too large"); |
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372 return NULL; |
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373 } |
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374 return newfloatobject(xx); |
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375 } |
| 69 | 376 err_setstr(RuntimeError, "bad number syntax"); |
| 377 return NULL; | |
| 378 } | |
| 379 | |
| 380 static object * | |
| 381 parsestr(s) | |
| 382 char *s; | |
| 383 { | |
| 384 object *v; | |
| 385 int len; | |
| 386 char *buf; | |
| 387 char *p; | |
| 388 int c; | |
| 389 if (*s != '\'') { | |
| 390 err_badcall(); | |
| 391 return NULL; | |
| 392 } | |
| 393 s++; | |
| 394 len = strlen(s); | |
| 395 if (s[--len] != '\'') { | |
| 396 err_badcall(); | |
| 397 return NULL; | |
| 398 } | |
| 399 if (strchr(s, '\\') == NULL) | |
| 400 return newsizedstringobject(s, len); | |
| 401 v = newsizedstringobject((char *)NULL, len); | |
| 402 p = buf = getstringvalue(v); | |
| 403 while (*s != '\0' && *s != '\'') { | |
| 404 if (*s != '\\') { | |
| 405 *p++ = *s++; | |
| 406 continue; | |
| 407 } | |
| 408 s++; | |
| 409 switch (*s++) { | |
| 410 /* XXX This assumes ASCII! */ | |
| 411 case '\\': *p++ = '\\'; break; | |
| 412 case '\'': *p++ = '\''; break; | |
| 413 case 'b': *p++ = '\b'; break; | |
| 414 case 'f': *p++ = '\014'; break; /* FF */ | |
| 415 case 't': *p++ = '\t'; break; | |
| 416 case 'n': *p++ = '\n'; break; | |
| 417 case 'r': *p++ = '\r'; break; | |
| 418 case 'v': *p++ = '\013'; break; /* VT */ | |
| 419 case 'E': *p++ = '\033'; break; /* ESC, not C */ | |
| 420 case 'a': *p++ = '\007'; break; /* BEL, not classic C */ | |
| 421 case '0': case '1': case '2': case '3': | |
| 422 case '4': case '5': case '6': case '7': | |
| 423 c = s[-1] - '0'; | |
| 424 if ('0' <= *s && *s <= '7') { | |
| 425 c = (c<<3) + *s++ - '0'; | |
| 426 if ('0' <= *s && *s <= '7') | |
| 427 c = (c<<3) + *s++ - '0'; | |
| 428 } | |
| 429 *p++ = c; | |
| 430 break; | |
| 431 case 'x': | |
| 432 if (isxdigit(*s)) { | |
| 433 sscanf(s, "%x", &c); | |
| 434 *p++ = c; | |
| 435 do { | |
| 436 s++; | |
| 437 } while (isxdigit(*s)); | |
| 438 break; | |
| 439 } | |
| 440 /* FALLTHROUGH */ | |
| 441 default: *p++ = '\\'; *p++ = s[-1]; break; | |
| 442 } | |
| 443 } | |
| 444 resizestring(&v, (int)(p - buf)); | |
| 445 return v; | |
| 446 } | |
| 447 | |
| 448 static void | |
| 449 com_list_constructor(c, n) | |
| 450 struct compiling *c; | |
| 451 node *n; | |
| 452 { | |
| 453 int len; | |
| 454 int i; | |
| 455 object *v, *w; | |
| 456 if (TYPE(n) != testlist) | |
| 457 REQ(n, exprlist); | |
| 458 /* exprlist: expr (',' expr)* [',']; likewise for testlist */ | |
| 459 len = (NCH(n) + 1) / 2; | |
| 460 for (i = 0; i < NCH(n); i += 2) | |
| 461 com_node(c, CHILD(n, i)); | |
| 462 com_addoparg(c, BUILD_LIST, len); | |
| 463 } | |
| 464 | |
| 465 static void | |
| 466 com_atom(c, n) | |
| 467 struct compiling *c; | |
| 468 node *n; | |
| 469 { | |
| 470 node *ch; | |
| 471 object *v; | |
| 472 int i; | |
| 473 REQ(n, atom); | |
| 474 ch = CHILD(n, 0); | |
| 475 switch (TYPE(ch)) { | |
| 476 case LPAR: | |
| 477 if (TYPE(CHILD(n, 1)) == RPAR) | |
| 478 com_addoparg(c, BUILD_TUPLE, 0); | |
| 479 else | |
| 480 com_node(c, CHILD(n, 1)); | |
| 481 break; | |
| 482 case LSQB: | |
| 483 if (TYPE(CHILD(n, 1)) == RSQB) | |
| 484 com_addoparg(c, BUILD_LIST, 0); | |
| 485 else | |
| 486 com_list_constructor(c, CHILD(n, 1)); | |
| 487 break; | |
| 488 case LBRACE: | |
| 489 com_addoparg(c, BUILD_MAP, 0); | |
| 490 break; | |
| 491 case BACKQUOTE: | |
| 492 com_node(c, CHILD(n, 1)); | |
| 493 com_addbyte(c, UNARY_CONVERT); | |
| 494 break; | |
| 495 case NUMBER: | |
| 496 if ((v = parsenumber(STR(ch))) == NULL) { | |
| 497 c->c_errors++; | |
| 498 i = 255; | |
| 499 } | |
| 500 else { | |
| 501 i = com_addconst(c, v); | |
| 502 DECREF(v); | |
| 503 } | |
| 504 com_addoparg(c, LOAD_CONST, i); | |
| 505 break; | |
| 506 case STRING: | |
| 507 if ((v = parsestr(STR(ch))) == NULL) { | |
| 508 c->c_errors++; | |
| 509 i = 255; | |
| 510 } | |
| 511 else { | |
| 512 i = com_addconst(c, v); | |
| 513 DECREF(v); | |
| 514 } | |
| 515 com_addoparg(c, LOAD_CONST, i); | |
| 516 break; | |
| 517 case NAME: | |
| 518 com_addopname(c, LOAD_NAME, ch); | |
| 519 break; | |
| 520 default: | |
| 521 fprintf(stderr, "node type %d\n", TYPE(ch)); | |
| 522 err_setstr(SystemError, "com_atom: unexpected node type"); | |
| 523 c->c_errors++; | |
| 524 } | |
| 525 } | |
| 526 | |
| 527 static void | |
| 528 com_slice(c, n, op) | |
| 529 struct compiling *c; | |
| 530 node *n; | |
| 531 int op; | |
| 532 { | |
| 533 if (NCH(n) == 1) { | |
| 534 com_addbyte(c, op); | |
| 535 } | |
| 536 else if (NCH(n) == 2) { | |
| 537 if (TYPE(CHILD(n, 0)) != COLON) { | |
| 538 com_node(c, CHILD(n, 0)); | |
| 539 com_addbyte(c, op+1); | |
| 540 } | |
| 541 else { | |
| 542 com_node(c, CHILD(n, 1)); | |
| 543 com_addbyte(c, op+2); | |
| 544 } | |
| 545 } | |
| 546 else { | |
| 547 com_node(c, CHILD(n, 0)); | |
| 548 com_node(c, CHILD(n, 2)); | |
| 549 com_addbyte(c, op+3); | |
| 550 } | |
| 551 } | |
| 552 | |
| 553 static void | |
| 554 com_apply_subscript(c, n) | |
| 555 struct compiling *c; | |
| 556 node *n; | |
| 557 { | |
| 558 REQ(n, subscript); | |
| 559 if (NCH(n) == 1 && TYPE(CHILD(n, 0)) != COLON) { | |
| 560 /* It's a single subscript */ | |
| 561 com_node(c, CHILD(n, 0)); | |
| 562 com_addbyte(c, BINARY_SUBSCR); | |
| 563 } | |
| 564 else { | |
| 565 /* It's a slice: [expr] ':' [expr] */ | |
| 566 com_slice(c, n, SLICE); | |
| 567 } | |
| 568 } | |
| 569 | |
| 570 static void | |
| 571 com_call_function(c, n) | |
| 572 struct compiling *c; | |
| 573 node *n; /* EITHER testlist OR ')' */ | |
| 574 { | |
| 575 if (TYPE(n) == RPAR) { | |
| 576 com_addbyte(c, UNARY_CALL); | |
| 577 } | |
| 578 else { | |
| 579 com_node(c, n); | |
| 580 com_addbyte(c, BINARY_CALL); | |
| 581 } | |
| 582 } | |
| 583 | |
| 584 static void | |
| 585 com_select_member(c, n) | |
| 586 struct compiling *c; | |
| 587 node *n; | |
| 588 { | |
| 589 com_addopname(c, LOAD_ATTR, n); | |
| 590 } | |
| 591 | |
| 592 static void | |
| 593 com_apply_trailer(c, n) | |
| 594 struct compiling *c; | |
| 595 node *n; | |
| 596 { | |
| 597 REQ(n, trailer); | |
| 598 switch (TYPE(CHILD(n, 0))) { | |
| 599 case LPAR: | |
| 600 com_call_function(c, CHILD(n, 1)); | |
| 601 break; | |
| 602 case DOT: | |
| 603 com_select_member(c, CHILD(n, 1)); | |
| 604 break; | |
| 605 case LSQB: | |
| 606 com_apply_subscript(c, CHILD(n, 1)); | |
| 607 break; | |
| 608 default: | |
| 609 err_setstr(SystemError, | |
| 610 "com_apply_trailer: unknown trailer type"); | |
| 611 c->c_errors++; | |
| 612 } | |
| 613 } | |
| 614 | |
| 615 static void | |
| 616 com_factor(c, n) | |
| 617 struct compiling *c; | |
| 618 node *n; | |
| 619 { | |
| 620 int i; | |
| 621 REQ(n, factor); | |
| 622 if (TYPE(CHILD(n, 0)) == PLUS) { | |
| 623 com_factor(c, CHILD(n, 1)); | |
| 624 com_addbyte(c, UNARY_POSITIVE); | |
| 625 } | |
| 626 else if (TYPE(CHILD(n, 0)) == MINUS) { | |
| 627 com_factor(c, CHILD(n, 1)); | |
| 628 com_addbyte(c, UNARY_NEGATIVE); | |
| 629 } | |
| 630 else { | |
| 631 com_atom(c, CHILD(n, 0)); | |
| 632 for (i = 1; i < NCH(n); i++) | |
| 633 com_apply_trailer(c, CHILD(n, i)); | |
| 634 } | |
| 635 } | |
| 636 | |
| 637 static void | |
| 638 com_term(c, n) | |
| 639 struct compiling *c; | |
| 640 node *n; | |
| 641 { | |
| 642 int i; | |
| 643 int op; | |
| 644 REQ(n, term); | |
| 645 com_factor(c, CHILD(n, 0)); | |
| 646 for (i = 2; i < NCH(n); i += 2) { | |
| 647 com_factor(c, CHILD(n, i)); | |
| 648 switch (TYPE(CHILD(n, i-1))) { | |
| 649 case STAR: | |
| 650 op = BINARY_MULTIPLY; | |
| 651 break; | |
| 652 case SLASH: | |
| 653 op = BINARY_DIVIDE; | |
| 654 break; | |
| 655 case PERCENT: | |
| 656 op = BINARY_MODULO; | |
| 657 break; | |
| 658 default: | |
| 659 err_setstr(SystemError, | |
| 660 "com_term: term operator not *, / or %"); | |
| 661 c->c_errors++; | |
| 662 op = 255; | |
| 663 } | |
| 664 com_addbyte(c, op); | |
| 665 } | |
| 666 } | |
| 667 | |
| 668 static void | |
| 669 com_expr(c, n) | |
| 670 struct compiling *c; | |
| 671 node *n; | |
| 672 { | |
| 673 int i; | |
| 674 int op; | |
| 675 REQ(n, expr); | |
| 676 com_term(c, CHILD(n, 0)); | |
| 677 for (i = 2; i < NCH(n); i += 2) { | |
| 678 com_term(c, CHILD(n, i)); | |
| 679 switch (TYPE(CHILD(n, i-1))) { | |
| 680 case PLUS: | |
| 681 op = BINARY_ADD; | |
| 682 break; | |
| 683 case MINUS: | |
| 684 op = BINARY_SUBTRACT; | |
| 685 break; | |
| 686 default: | |
| 687 err_setstr(SystemError, | |
| 688 "com_expr: expr operator not + or -"); | |
| 689 c->c_errors++; | |
| 690 op = 255; | |
| 691 } | |
| 692 com_addbyte(c, op); | |
| 693 } | |
| 694 } | |
| 695 | |
| 696 static enum cmp_op | |
| 697 cmp_type(n) | |
| 698 node *n; | |
| 699 { | |
| 700 REQ(n, comp_op); | |
| 701 /* comp_op: '<' | '>' | '=' | '>' '=' | '<' '=' | '<' '>' | |
| 702 | 'in' | 'not' 'in' | 'is' | 'is' not' */ | |
| 703 if (NCH(n) == 1) { | |
| 704 n = CHILD(n, 0); | |
| 705 switch (TYPE(n)) { | |
| 706 case LESS: return LT; | |
| 707 case GREATER: return GT; | |
| 708 case EQUAL: return EQ; | |
| 709 case NAME: if (strcmp(STR(n), "in") == 0) return IN; | |
| 710 if (strcmp(STR(n), "is") == 0) return IS; | |
| 711 } | |
| 712 } | |
| 713 else if (NCH(n) == 2) { | |
| 714 int t2 = TYPE(CHILD(n, 1)); | |
| 715 switch (TYPE(CHILD(n, 0))) { | |
| 716 case LESS: if (t2 == EQUAL) return LE; | |
| 717 if (t2 == GREATER) return NE; | |
| 718 break; | |
| 719 case GREATER: if (t2 == EQUAL) return GE; | |
| 720 break; | |
| 721 case NAME: if (strcmp(STR(CHILD(n, 1)), "in") == 0) | |
| 722 return NOT_IN; | |
| 723 if (strcmp(STR(CHILD(n, 0)), "is") == 0) | |
| 724 return IS_NOT; | |
| 725 } | |
| 726 } | |
| 727 return BAD; | |
| 728 } | |
| 729 | |
| 730 static void | |
| 731 com_comparison(c, n) | |
| 732 struct compiling *c; | |
| 733 node *n; | |
| 734 { | |
| 735 int i; | |
| 736 enum cmp_op op; | |
| 737 int anchor; | |
| 738 REQ(n, comparison); /* comparison: expr (comp_op expr)* */ | |
| 739 com_expr(c, CHILD(n, 0)); | |
| 740 if (NCH(n) == 1) | |
| 741 return; | |
| 742 | |
| 743 /**************************************************************** | |
| 744 The following code is generated for all but the last | |
| 745 comparison in a chain: | |
| 746 | |
| 747 label: on stack: opcode: jump to: | |
| 748 | |
| 749 a <code to load b> | |
| 750 a, b DUP_TOP | |
| 751 a, b, b ROT_THREE | |
| 752 b, a, b COMPARE_OP | |
| 753 b, 0-or-1 JUMP_IF_FALSE L1 | |
| 754 b, 1 POP_TOP | |
| 755 b | |
| 756 | |
| 757 We are now ready to repeat this sequence for the next | |
| 758 comparison in the chain. | |
| 759 | |
| 760 For the last we generate: | |
| 761 | |
| 762 b <code to load c> | |
| 763 b, c COMPARE_OP | |
| 764 0-or-1 | |
| 765 | |
| 766 If there were any jumps to L1 (i.e., there was more than one | |
| 767 comparison), we generate: | |
| 768 | |
| 769 0-or-1 JUMP_FORWARD L2 | |
| 770 L1: b, 0 ROT_TWO | |
| 771 0, b POP_TOP | |
| 772 0 | |
| 773 L2: | |
| 774 ****************************************************************/ | |
| 775 | |
| 776 anchor = 0; | |
| 777 | |
| 778 for (i = 2; i < NCH(n); i += 2) { | |
| 779 com_expr(c, CHILD(n, i)); | |
| 780 if (i+2 < NCH(n)) { | |
| 781 com_addbyte(c, DUP_TOP); | |
| 782 com_addbyte(c, ROT_THREE); | |
| 783 } | |
| 784 op = cmp_type(CHILD(n, i-1)); | |
| 785 if (op == BAD) { | |
| 786 err_setstr(SystemError, | |
| 787 "com_comparison: unknown comparison op"); | |
| 788 c->c_errors++; | |
| 789 } | |
| 790 com_addoparg(c, COMPARE_OP, op); | |
| 791 if (i+2 < NCH(n)) { | |
| 792 com_addfwref(c, JUMP_IF_FALSE, &anchor); | |
| 793 com_addbyte(c, POP_TOP); | |
| 794 } | |
| 795 } | |
| 796 | |
| 797 if (anchor) { | |
| 798 int anchor2 = 0; | |
| 799 com_addfwref(c, JUMP_FORWARD, &anchor2); | |
| 800 com_backpatch(c, anchor); | |
| 801 com_addbyte(c, ROT_TWO); | |
| 802 com_addbyte(c, POP_TOP); | |
| 803 com_backpatch(c, anchor2); | |
| 804 } | |
| 805 } | |
| 806 | |
| 807 static void | |
| 808 com_not_test(c, n) | |
| 809 struct compiling *c; | |
| 810 node *n; | |
| 811 { | |
| 812 REQ(n, not_test); /* 'not' not_test | comparison */ | |
| 813 if (NCH(n) == 1) { | |
| 814 com_comparison(c, CHILD(n, 0)); | |
| 815 } | |
| 816 else { | |
| 817 com_not_test(c, CHILD(n, 1)); | |
| 818 com_addbyte(c, UNARY_NOT); | |
| 819 } | |
| 820 } | |
| 821 | |
| 822 static void | |
| 823 com_and_test(c, n) | |
| 824 struct compiling *c; | |
| 825 node *n; | |
| 826 { | |
| 827 int i; | |
| 828 int anchor; | |
| 829 REQ(n, and_test); /* not_test ('and' not_test)* */ | |
| 830 anchor = 0; | |
| 831 i = 0; | |
| 832 for (;;) { | |
| 833 com_not_test(c, CHILD(n, i)); | |
| 834 if ((i += 2) >= NCH(n)) | |
| 835 break; | |
| 836 com_addfwref(c, JUMP_IF_FALSE, &anchor); | |
| 837 com_addbyte(c, POP_TOP); | |
| 838 } | |
| 839 if (anchor) | |
| 840 com_backpatch(c, anchor); | |
| 841 } | |
| 842 | |
| 843 static void | |
| 844 com_test(c, n) | |
| 845 struct compiling *c; | |
| 846 node *n; | |
| 847 { | |
| 848 int i; | |
| 849 int anchor; | |
| 850 REQ(n, test); /* and_test ('and' and_test)* */ | |
| 851 anchor = 0; | |
| 852 i = 0; | |
| 853 for (;;) { | |
| 854 com_and_test(c, CHILD(n, i)); | |
| 855 if ((i += 2) >= NCH(n)) | |
| 856 break; | |
| 857 com_addfwref(c, JUMP_IF_TRUE, &anchor); | |
| 858 com_addbyte(c, POP_TOP); | |
| 859 } | |
| 860 if (anchor) | |
| 861 com_backpatch(c, anchor); | |
| 862 } | |
| 863 | |
| 864 static void | |
| 865 com_list(c, n) | |
| 866 struct compiling *c; | |
| 867 node *n; | |
| 868 { | |
| 869 /* exprlist: expr (',' expr)* [',']; likewise for testlist */ | |
| 870 if (NCH(n) == 1) { | |
| 871 com_node(c, CHILD(n, 0)); | |
| 872 } | |
| 873 else { | |
| 874 int i; | |
| 875 int len; | |
| 876 len = (NCH(n) + 1) / 2; | |
| 877 for (i = 0; i < NCH(n); i += 2) | |
| 878 com_node(c, CHILD(n, i)); | |
| 879 com_addoparg(c, BUILD_TUPLE, len); | |
| 880 } | |
| 881 } | |
| 882 | |
| 883 | |
| 884 /* Begin of assignment compilation */ | |
| 885 | |
| 886 static void com_assign_name PROTO((struct compiling *, node *, int)); | |
| 887 static void com_assign PROTO((struct compiling *, node *, int)); | |
| 888 | |
| 889 static void | |
| 890 com_assign_attr(c, n, assigning) | |
| 891 struct compiling *c; | |
| 892 node *n; | |
| 893 int assigning; | |
| 894 { | |
| 895 com_addopname(c, assigning ? STORE_ATTR : DELETE_ATTR, n); | |
| 896 } | |
| 897 | |
| 898 static void | |
| 899 com_assign_slice(c, n, assigning) | |
| 900 struct compiling *c; | |
| 901 node *n; | |
| 902 int assigning; | |
| 903 { | |
| 904 com_slice(c, n, assigning ? STORE_SLICE : DELETE_SLICE); | |
| 905 } | |
| 906 | |
| 907 static void | |
| 908 com_assign_subscript(c, n, assigning) | |
| 909 struct compiling *c; | |
| 910 node *n; | |
| 911 int assigning; | |
| 912 { | |
| 913 com_node(c, n); | |
| 914 com_addbyte(c, assigning ? STORE_SUBSCR : DELETE_SUBSCR); | |
| 915 } | |
| 916 | |
| 917 static void | |
| 918 com_assign_trailer(c, n, assigning) | |
| 919 struct compiling *c; | |
| 920 node *n; | |
| 921 int assigning; | |
| 922 { | |
| 923 char *name; | |
| 924 REQ(n, trailer); | |
| 925 switch (TYPE(CHILD(n, 0))) { | |
| 926 case LPAR: /* '(' [exprlist] ')' */ | |
| 927 err_setstr(TypeError, "can't assign to function call"); | |
| 928 c->c_errors++; | |
| 929 break; | |
| 930 case DOT: /* '.' NAME */ | |
| 931 com_assign_attr(c, CHILD(n, 1), assigning); | |
| 932 break; | |
| 933 case LSQB: /* '[' subscript ']' */ | |
| 934 n = CHILD(n, 1); | |
| 935 REQ(n, subscript); /* subscript: expr | [expr] ':' [expr] */ | |
| 936 if (NCH(n) > 1 || TYPE(CHILD(n, 0)) == COLON) | |
| 937 com_assign_slice(c, n, assigning); | |
| 938 else | |
| 939 com_assign_subscript(c, CHILD(n, 0), assigning); | |
| 940 break; | |
| 941 default: | |
| 942 err_setstr(TypeError, "unknown trailer type"); | |
| 943 c->c_errors++; | |
| 944 } | |
| 945 } | |
| 946 | |
| 947 static void | |
| 948 com_assign_tuple(c, n, assigning) | |
| 949 struct compiling *c; | |
| 950 node *n; | |
| 951 int assigning; | |
| 952 { | |
| 953 int i; | |
| 954 if (TYPE(n) != testlist) | |
| 955 REQ(n, exprlist); | |
| 956 if (assigning) | |
| 957 com_addoparg(c, UNPACK_TUPLE, (NCH(n)+1)/2); | |
| 958 for (i = 0; i < NCH(n); i += 2) | |
| 959 com_assign(c, CHILD(n, i), assigning); | |
| 960 } | |
| 961 | |
| 962 static void | |
| 963 com_assign_list(c, n, assigning) | |
| 964 struct compiling *c; | |
| 965 node *n; | |
| 966 int assigning; | |
| 967 { | |
| 968 int i; | |
| 969 if (assigning) | |
| 970 com_addoparg(c, UNPACK_LIST, (NCH(n)+1)/2); | |
| 971 for (i = 0; i < NCH(n); i += 2) | |
| 972 com_assign(c, CHILD(n, i), assigning); | |
| 973 } | |
| 974 | |
| 975 static void | |
| 976 com_assign_name(c, n, assigning) | |
| 977 struct compiling *c; | |
| 978 node *n; | |
| 979 int assigning; | |
| 980 { | |
| 981 REQ(n, NAME); | |
| 982 com_addopname(c, assigning ? STORE_NAME : DELETE_NAME, n); | |
| 983 } | |
| 984 | |
| 985 static void | |
| 986 com_assign(c, n, assigning) | |
| 987 struct compiling *c; | |
| 988 node *n; | |
| 989 int assigning; | |
| 990 { | |
| 991 /* Loop to avoid trivial recursion */ | |
| 992 for (;;) { | |
| 993 switch (TYPE(n)) { | |
|
73
3028acaa56b0
Compile class definitions.
Guido van Rossum <guido@python.org>
parents:
69
diff
changeset
|
994 |
| 69 | 995 case exprlist: |
| 996 case testlist: | |
| 997 if (NCH(n) > 1) { | |
| 998 com_assign_tuple(c, n, assigning); | |
| 999 return; | |
| 1000 } | |
| 1001 n = CHILD(n, 0); | |
| 1002 break; | |
|
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1003 |
| 69 | 1004 case test: |
| 1005 case and_test: | |
| 1006 case not_test: | |
| 1007 if (NCH(n) > 1) { | |
| 1008 err_setstr(TypeError, | |
| 1009 "can't assign to operator"); | |
| 1010 c->c_errors++; | |
| 1011 return; | |
| 1012 } | |
| 1013 n = CHILD(n, 0); | |
| 1014 break; | |
|
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1015 |
| 69 | 1016 case comparison: |
| 1017 if (NCH(n) > 1) { | |
| 1018 err_setstr(TypeError, | |
| 1019 "can't assign to operator"); | |
| 1020 c->c_errors++; | |
| 1021 return; | |
| 1022 } | |
| 1023 n = CHILD(n, 0); | |
| 1024 break; | |
|
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1025 |
| 69 | 1026 case expr: |
| 1027 if (NCH(n) > 1) { | |
| 1028 err_setstr(TypeError, | |
| 1029 "can't assign to operator"); | |
| 1030 c->c_errors++; | |
| 1031 return; | |
| 1032 } | |
| 1033 n = CHILD(n, 0); | |
| 1034 break; | |
|
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|
1035 |
| 69 | 1036 case term: |
| 1037 if (NCH(n) > 1) { | |
| 1038 err_setstr(TypeError, | |
| 1039 "can't assign to operator"); | |
| 1040 c->c_errors++; | |
| 1041 return; | |
| 1042 } | |
| 1043 n = CHILD(n, 0); | |
| 1044 break; | |
|
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1045 |
| 69 | 1046 case factor: /* ('+'|'-') factor | atom trailer* */ |
| 1047 if (TYPE(CHILD(n, 0)) != atom) { /* '+' | '-' */ | |
| 1048 err_setstr(TypeError, | |
| 1049 "can't assign to operator"); | |
| 1050 c->c_errors++; | |
| 1051 return; | |
| 1052 } | |
| 1053 if (NCH(n) > 1) { /* trailer present */ | |
| 1054 int i; | |
| 1055 com_node(c, CHILD(n, 0)); | |
| 1056 for (i = 1; i+1 < NCH(n); i++) { | |
| 1057 com_apply_trailer(c, CHILD(n, i)); | |
| 1058 } /* NB i is still alive */ | |
| 1059 com_assign_trailer(c, | |
| 1060 CHILD(n, i), assigning); | |
| 1061 return; | |
| 1062 } | |
| 1063 n = CHILD(n, 0); | |
| 1064 break; | |
|
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1065 |
| 69 | 1066 case atom: |
| 1067 switch (TYPE(CHILD(n, 0))) { | |
| 1068 case LPAR: | |
| 1069 n = CHILD(n, 1); | |
| 1070 if (TYPE(n) == RPAR) { | |
| 1071 /* XXX Should allow () = () ??? */ | |
| 1072 err_setstr(TypeError, | |
| 1073 "can't assign to ()"); | |
| 1074 c->c_errors++; | |
| 1075 return; | |
| 1076 } | |
| 1077 break; | |
| 1078 case LSQB: | |
| 1079 n = CHILD(n, 1); | |
| 1080 if (TYPE(n) == RSQB) { | |
| 1081 err_setstr(TypeError, | |
| 1082 "can't assign to []"); | |
| 1083 c->c_errors++; | |
| 1084 return; | |
| 1085 } | |
| 1086 com_assign_list(c, n, assigning); | |
| 1087 return; | |
| 1088 case NAME: | |
| 1089 com_assign_name(c, CHILD(n, 0), assigning); | |
| 1090 return; | |
| 1091 default: | |
| 1092 err_setstr(TypeError, | |
| 1093 "can't assign to constant"); | |
| 1094 c->c_errors++; | |
| 1095 return; | |
| 1096 } | |
| 1097 break; | |
|
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1098 |
| 69 | 1099 default: |
| 1100 fprintf(stderr, "node type %d\n", TYPE(n)); | |
| 1101 err_setstr(SystemError, "com_assign: bad node"); | |
| 1102 c->c_errors++; | |
| 1103 return; | |
|
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|
1104 |
| 69 | 1105 } |
| 1106 } | |
| 1107 } | |
| 1108 | |
| 1109 static void | |
| 1110 com_expr_stmt(c, n) | |
| 1111 struct compiling *c; | |
| 1112 node *n; | |
| 1113 { | |
| 1114 REQ(n, expr_stmt); /* exprlist ('=' exprlist)* NEWLINE */ | |
| 1115 com_node(c, CHILD(n, NCH(n)-2)); | |
| 1116 if (NCH(n) == 2) { | |
| 1117 com_addbyte(c, PRINT_EXPR); | |
| 1118 } | |
| 1119 else { | |
| 1120 int i; | |
| 1121 for (i = 0; i < NCH(n)-3; i+=2) { | |
| 1122 if (i+2 < NCH(n)-3) | |
| 1123 com_addbyte(c, DUP_TOP); | |
| 1124 com_assign(c, CHILD(n, i), 1/*assign*/); | |
| 1125 } | |
| 1126 } | |
| 1127 } | |
| 1128 | |
| 1129 static void | |
| 1130 com_print_stmt(c, n) | |
| 1131 struct compiling *c; | |
| 1132 node *n; | |
| 1133 { | |
| 1134 int i; | |
| 1135 REQ(n, print_stmt); /* 'print' (test ',')* [test] NEWLINE */ | |
| 1136 for (i = 1; i+1 < NCH(n); i += 2) { | |
| 1137 com_node(c, CHILD(n, i)); | |
| 1138 com_addbyte(c, PRINT_ITEM); | |
| 1139 } | |
| 1140 if (TYPE(CHILD(n, NCH(n)-2)) != COMMA) | |
| 1141 com_addbyte(c, PRINT_NEWLINE); | |
|
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|
1142 /* XXX Alternatively, LOAD_CONST '\n' and then PRINT_ITEM */ |
| 69 | 1143 } |
| 1144 | |
| 1145 static void | |
| 1146 com_return_stmt(c, n) | |
| 1147 struct compiling *c; | |
| 1148 node *n; | |
| 1149 { | |
| 1150 REQ(n, return_stmt); /* 'return' [testlist] NEWLINE */ | |
| 86 | 1151 if (!c->c_infunction) { |
| 1152 err_setstr(TypeError, "'return' outside function"); | |
| 1153 c->c_errors++; | |
| 1154 } | |
| 69 | 1155 if (NCH(n) == 2) |
| 1156 com_addoparg(c, LOAD_CONST, com_addconst(c, None)); | |
| 1157 else | |
| 1158 com_node(c, CHILD(n, 1)); | |
| 1159 com_addbyte(c, RETURN_VALUE); | |
| 1160 } | |
| 1161 | |
| 1162 static void | |
| 1163 com_raise_stmt(c, n) | |
| 1164 struct compiling *c; | |
| 1165 node *n; | |
| 1166 { | |
| 1167 REQ(n, raise_stmt); /* 'raise' expr [',' expr] NEWLINE */ | |
| 1168 com_node(c, CHILD(n, 1)); | |
| 1169 if (NCH(n) > 3) | |
| 1170 com_node(c, CHILD(n, 3)); | |
| 1171 else | |
| 1172 com_addoparg(c, LOAD_CONST, com_addconst(c, None)); | |
| 1173 com_addbyte(c, RAISE_EXCEPTION); | |
| 1174 } | |
| 1175 | |
| 1176 static void | |
| 1177 com_import_stmt(c, n) | |
| 1178 struct compiling *c; | |
| 1179 node *n; | |
| 1180 { | |
| 1181 int i; | |
| 1182 REQ(n, import_stmt); | |
| 1183 /* 'import' NAME (',' NAME)* NEWLINE | | |
| 1184 'from' NAME 'import' ('*' | NAME (',' NAME)*) NEWLINE */ | |
| 1185 if (STR(CHILD(n, 0))[0] == 'f') { | |
| 1186 /* 'from' NAME 'import' ... */ | |
| 1187 REQ(CHILD(n, 1), NAME); | |
| 1188 com_addopname(c, IMPORT_NAME, CHILD(n, 1)); | |
| 1189 for (i = 3; i < NCH(n); i += 2) | |
| 1190 com_addopname(c, IMPORT_FROM, CHILD(n, i)); | |
| 1191 com_addbyte(c, POP_TOP); | |
| 1192 } | |
| 1193 else { | |
|
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|
1194 /* 'import' ... */ |
| 69 | 1195 for (i = 1; i < NCH(n); i += 2) { |
| 1196 com_addopname(c, IMPORT_NAME, CHILD(n, i)); | |
| 1197 com_addopname(c, STORE_NAME, CHILD(n, i)); | |
| 1198 } | |
| 1199 } | |
| 1200 } | |
| 1201 | |
| 1202 static void | |
| 1203 com_if_stmt(c, n) | |
| 1204 struct compiling *c; | |
| 1205 node *n; | |
| 1206 { | |
| 1207 int i; | |
| 1208 int anchor = 0; | |
| 1209 REQ(n, if_stmt); | |
| 1210 /*'if' test ':' suite ('elif' test ':' suite)* ['else' ':' suite] */ | |
| 1211 for (i = 0; i+3 < NCH(n); i+=4) { | |
| 1212 int a = 0; | |
| 86 | 1213 node *ch = CHILD(n, i+1); |
| 1214 if (i > 0) | |
| 1215 com_addoparg(c, SET_LINENO, ch->n_lineno); | |
| 69 | 1216 com_node(c, CHILD(n, i+1)); |
| 1217 com_addfwref(c, JUMP_IF_FALSE, &a); | |
| 1218 com_addbyte(c, POP_TOP); | |
| 1219 com_node(c, CHILD(n, i+3)); | |
| 1220 com_addfwref(c, JUMP_FORWARD, &anchor); | |
| 1221 com_backpatch(c, a); | |
| 1222 com_addbyte(c, POP_TOP); | |
| 1223 } | |
| 1224 if (i+2 < NCH(n)) | |
| 1225 com_node(c, CHILD(n, i+2)); | |
| 1226 com_backpatch(c, anchor); | |
| 1227 } | |
| 1228 | |
| 1229 static void | |
| 1230 com_while_stmt(c, n) | |
| 1231 struct compiling *c; | |
| 1232 node *n; | |
| 1233 { | |
| 1234 int break_anchor = 0; | |
| 1235 int anchor = 0; | |
| 1236 int begin; | |
| 1237 REQ(n, while_stmt); /* 'while' test ':' suite ['else' ':' suite] */ | |
| 1238 com_addfwref(c, SETUP_LOOP, &break_anchor); | |
| 1239 begin = c->c_nexti; | |
| 86 | 1240 com_addoparg(c, SET_LINENO, n->n_lineno); |
| 69 | 1241 com_node(c, CHILD(n, 1)); |
| 1242 com_addfwref(c, JUMP_IF_FALSE, &anchor); | |
| 1243 com_addbyte(c, POP_TOP); | |
| 86 | 1244 c->c_loops++; |
| 69 | 1245 com_node(c, CHILD(n, 3)); |
| 86 | 1246 c->c_loops--; |
| 69 | 1247 com_addoparg(c, JUMP_ABSOLUTE, begin); |
| 1248 com_backpatch(c, anchor); | |
| 1249 com_addbyte(c, POP_TOP); | |
| 1250 com_addbyte(c, POP_BLOCK); | |
| 1251 if (NCH(n) > 4) | |
| 1252 com_node(c, CHILD(n, 6)); | |
| 1253 com_backpatch(c, break_anchor); | |
| 1254 } | |
| 1255 | |
| 1256 static void | |
| 1257 com_for_stmt(c, n) | |
| 1258 struct compiling *c; | |
| 1259 node *n; | |
| 1260 { | |
| 1261 object *v; | |
| 1262 int break_anchor = 0; | |
| 1263 int anchor = 0; | |
| 1264 int begin; | |
| 1265 REQ(n, for_stmt); | |
| 1266 /* 'for' exprlist 'in' exprlist ':' suite ['else' ':' suite] */ | |
| 1267 com_addfwref(c, SETUP_LOOP, &break_anchor); | |
| 1268 com_node(c, CHILD(n, 3)); | |
| 1269 v = newintobject(0L); | |
| 1270 if (v == NULL) | |
| 1271 c->c_errors++; | |
| 1272 com_addoparg(c, LOAD_CONST, com_addconst(c, v)); | |
| 1273 XDECREF(v); | |
| 1274 begin = c->c_nexti; | |
| 86 | 1275 com_addoparg(c, SET_LINENO, n->n_lineno); |
| 69 | 1276 com_addfwref(c, FOR_LOOP, &anchor); |
| 1277 com_assign(c, CHILD(n, 1), 1/*assigning*/); | |
| 86 | 1278 c->c_loops++; |
| 69 | 1279 com_node(c, CHILD(n, 5)); |
| 86 | 1280 c->c_loops--; |
| 69 | 1281 com_addoparg(c, JUMP_ABSOLUTE, begin); |
| 1282 com_backpatch(c, anchor); | |
| 1283 com_addbyte(c, POP_BLOCK); | |
| 1284 if (NCH(n) > 8) | |
| 1285 com_node(c, CHILD(n, 8)); | |
| 1286 com_backpatch(c, break_anchor); | |
| 1287 } | |
| 1288 | |
|
73
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|
1289 /* Although 'execpt' and 'finally' clauses can be combined |
|
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|
1290 syntactically, they are compiled separately. In fact, |
|
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diff
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|
1291 try: S |
|
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|
1292 except E1: S1 |
|
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|
1293 except E2: S2 |
|
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diff
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|
1294 ... |
|
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Compile class definitions.
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diff
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|
1295 finally: Sf |
|
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Compile class definitions.
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diff
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|
1296 is equivalent to |
|
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Compile class definitions.
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|
1297 try: |
|
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|
1298 try: S |
|
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|
1299 except E1: S1 |
|
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|
1300 except E2: S2 |
|
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Compile class definitions.
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diff
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|
1301 ... |
|
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Compile class definitions.
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|
1302 finally: Sf |
|
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|
1303 meaning that the 'finally' clause is entered even if things |
|
3028acaa56b0
Compile class definitions.
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|
1304 go wrong again in an exception handler. Note that this is |
|
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Compile class definitions.
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|
1305 not the case for exception handlers: at most one is entered. |
|
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Compile class definitions.
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|
1306 |
|
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|
1307 Code generated for "try: S finally: Sf" is as follows: |
|
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Compile class definitions.
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|
1308 |
|
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|
1309 SETUP_FINALLY L |
|
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|
1310 <code for S> |
|
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Compile class definitions.
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|
1311 POP_BLOCK |
|
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|
1312 LOAD_CONST <nil> |
|
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|
1313 L: <code for Sf> |
|
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|
1314 END_FINALLY |
|
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|
1315 |
|
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|
1316 The special instructions use the block stack. Each block |
|
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|
1317 stack entry contains the instruction that created it (here |
|
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|
1318 SETUP_FINALLY), the level of the value stack at the time the |
|
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|
1319 block stack entry was created, and a label (here L). |
|
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|
1320 |
|
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|
1321 SETUP_FINALLY: |
|
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|
1322 Pushes the current value stack level and the label |
|
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|
1323 onto the block stack. |
|
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|
1324 POP_BLOCK: |
|
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|
1325 Pops en entry from the block stack, and pops the value |
|
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|
1326 stack until its level is the same as indicated on the |
|
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|
1327 block stack. (The label is ignored.) |
|
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|
1328 END_FINALLY: |
| 86 | 1329 Pops a variable number of entries from the *value* stack |
| 1330 and re-raises the exception they specify. The number of | |
| 1331 entries popped depends on the (pseudo) exception type. | |
|
73
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|
1332 |
|
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|
1333 The block stack is unwound when an exception is raised: |
|
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|
1334 when a SETUP_FINALLY entry is found, the exception is pushed |
|
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|
1335 onto the value stack (and the exception condition is cleared), |
|
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1336 and the interpreter jumps to the label gotten from the block |
|
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|
1337 stack. |
|
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|
1338 |
|
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|
1339 Code generated for "try: S except E1, V1: S1 except E2, V2: S2 ...": |
| 86 | 1340 (The contents of the value stack is shown in [], with the top |
| 1341 at the right; 'tb' is trace-back info, 'val' the exception's | |
| 1342 associated value, and 'exc' the exception.) | |
|
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|
1343 |
|
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|
1344 Value stack Label Instruction Argument |
|
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|
1345 [] SETUP_EXCEPT L1 |
|
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1346 [] <code for S> |
|
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|
1347 [] POP_BLOCK |
|
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|
1348 [] JUMP_FORWARD L0 |
|
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|
1349 |
| 86 | 1350 [tb, val, exc] L1: DUP ) |
| 1351 [tb, val, exc, exc] <evaluate E1> ) | |
| 1352 [tb, val, exc, exc, E1] COMPARE_OP EXC_MATCH ) only if E1 | |
| 1353 [tb, val, exc, 1-or-0] JUMP_IF_FALSE L2 ) | |
| 1354 [tb, val, exc, 1] POP ) | |
| 1355 [tb, val, exc] POP | |
| 1356 [tb, val] <assign to V1> (or POP if no V1) | |
| 1357 [tb] POP | |
|
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|
1358 [] <code for S1> |
|
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1359 JUMP_FORWARD L0 |
|
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|
1360 |
| 86 | 1361 [tb, val, exc, 0] L2: POP |
| 1362 [tb, val, exc] DUP | |
|
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1363 .............................etc....................... |
|
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1364 |
| 86 | 1365 [tb, val, exc, 0] Ln+1: POP |
| 1366 [tb, val, exc] END_FINALLY # re-raise exception | |
|
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1367 |
|
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|
1368 [] L0: <next statement> |
|
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1369 |
|
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1370 Of course, parts are not generated if Vi or Ei is not present. |
|
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1371 */ |
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1372 |
| 69 | 1373 static void |
| 1374 com_try_stmt(c, n) | |
| 1375 struct compiling *c; | |
| 1376 node *n; | |
| 1377 { | |
| 1378 int finally_anchor = 0; | |
| 1379 int except_anchor = 0; | |
| 1380 REQ(n, try_stmt); | |
| 1381 /* 'try' ':' suite (except_clause ':' suite)* ['finally' ':' suite] */ | |
|
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1382 |
| 69 | 1383 if (NCH(n) > 3 && TYPE(CHILD(n, NCH(n)-3)) != except_clause) { |
| 1384 /* Have a 'finally' clause */ | |
| 1385 com_addfwref(c, SETUP_FINALLY, &finally_anchor); | |
| 1386 } | |
| 1387 if (NCH(n) > 3 && TYPE(CHILD(n, 3)) == except_clause) { | |
| 1388 /* Have an 'except' clause */ | |
| 1389 com_addfwref(c, SETUP_EXCEPT, &except_anchor); | |
| 1390 } | |
| 1391 com_node(c, CHILD(n, 2)); | |
| 1392 if (except_anchor) { | |
| 1393 int end_anchor = 0; | |
| 1394 int i; | |
| 1395 node *ch; | |
| 1396 com_addbyte(c, POP_BLOCK); | |
| 1397 com_addfwref(c, JUMP_FORWARD, &end_anchor); | |
| 1398 com_backpatch(c, except_anchor); | |
| 1399 for (i = 3; | |
| 1400 i < NCH(n) && TYPE(ch = CHILD(n, i)) == except_clause; | |
| 1401 i += 3) { | |
| 1402 /* except_clause: 'except' [expr [',' expr]] */ | |
|
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1403 if (except_anchor == 0) { |
|
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|
1404 err_setstr(TypeError, |
|
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|
1405 "default 'except:' must be last"); |
|
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|
1406 c->c_errors++; |
|
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|
1407 break; |
|
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|
1408 } |
|
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|
1409 except_anchor = 0; |
| 86 | 1410 com_addoparg(c, SET_LINENO, ch->n_lineno); |
| 69 | 1411 if (NCH(ch) > 1) { |
| 1412 com_addbyte(c, DUP_TOP); | |
| 1413 com_node(c, CHILD(ch, 1)); | |
| 1414 com_addoparg(c, COMPARE_OP, EXC_MATCH); | |
|
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|
1415 com_addfwref(c, JUMP_IF_FALSE, &except_anchor); |
| 69 | 1416 com_addbyte(c, POP_TOP); |
| 1417 } | |
| 1418 com_addbyte(c, POP_TOP); | |
| 1419 if (NCH(ch) > 3) | |
| 1420 com_assign(c, CHILD(ch, 3), 1/*assigning*/); | |
| 1421 else | |
| 1422 com_addbyte(c, POP_TOP); | |
| 86 | 1423 com_addbyte(c, POP_TOP); |
| 69 | 1424 com_node(c, CHILD(n, i+2)); |
| 1425 com_addfwref(c, JUMP_FORWARD, &end_anchor); | |
|
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|
1426 if (except_anchor) { |
|
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|
1427 com_backpatch(c, except_anchor); |
|
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1428 com_addbyte(c, POP_TOP); |
|
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|
1429 } |
| 69 | 1430 } |
| 1431 com_addbyte(c, END_FINALLY); | |
| 1432 com_backpatch(c, end_anchor); | |
| 1433 } | |
| 1434 if (finally_anchor) { | |
| 86 | 1435 node *ch; |
| 69 | 1436 com_addbyte(c, POP_BLOCK); |
| 1437 com_addoparg(c, LOAD_CONST, com_addconst(c, None)); | |
| 1438 com_backpatch(c, finally_anchor); | |
| 86 | 1439 ch = CHILD(n, NCH(n)-1); |
| 1440 com_addoparg(c, SET_LINENO, ch->n_lineno); | |
| 1441 com_node(c, ch); | |
| 69 | 1442 com_addbyte(c, END_FINALLY); |
| 1443 } | |
| 1444 } | |
| 1445 | |
| 1446 static void | |
| 1447 com_suite(c, n) | |
| 1448 struct compiling *c; | |
| 1449 node *n; | |
| 1450 { | |
| 1451 REQ(n, suite); | |
| 1452 /* simple_stmt | NEWLINE INDENT NEWLINE* (stmt NEWLINE*)+ DEDENT */ | |
| 1453 if (NCH(n) == 1) { | |
| 1454 com_node(c, CHILD(n, 0)); | |
| 1455 } | |
| 1456 else { | |
| 1457 int i; | |
| 1458 for (i = 0; i < NCH(n); i++) { | |
| 1459 node *ch = CHILD(n, i); | |
| 1460 if (TYPE(ch) == stmt) | |
| 1461 com_node(c, ch); | |
| 1462 } | |
| 1463 } | |
| 1464 } | |
| 1465 | |
| 1466 static void | |
| 1467 com_funcdef(c, n) | |
| 1468 struct compiling *c; | |
| 1469 node *n; | |
| 1470 { | |
| 1471 object *v; | |
| 1472 REQ(n, funcdef); /* funcdef: 'def' NAME parameters ':' suite */ | |
| 86 | 1473 v = (object *)compile(n, c->c_filename); |
| 69 | 1474 if (v == NULL) |
| 1475 c->c_errors++; | |
| 1476 else { | |
| 1477 int i = com_addconst(c, v); | |
| 1478 com_addoparg(c, LOAD_CONST, i); | |
| 1479 com_addbyte(c, BUILD_FUNCTION); | |
| 1480 com_addopname(c, STORE_NAME, CHILD(n, 1)); | |
| 1481 DECREF(v); | |
| 1482 } | |
| 1483 } | |
| 1484 | |
| 1485 static void | |
|
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|
1486 com_bases(c, n) |
|
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|
1487 struct compiling *c; |
|
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|
1488 node *n; |
|
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|
1489 { |
|
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|
1490 int i, nbases; |
|
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|
1491 REQ(n, baselist); |
|
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|
1492 /* |
|
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|
1493 baselist: atom arguments (',' atom arguments)* |
|
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1494 arguments: '(' [testlist] ')' |
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1495 */ |
|
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1496 for (i = 0; i < NCH(n); i += 3) |
|
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1497 com_node(c, CHILD(n, i)); |
|
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1498 com_addoparg(c, BUILD_TUPLE, (NCH(n)+1) / 3); |
|
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1499 } |
|
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|
1500 |
|
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1501 static void |
| 69 | 1502 com_classdef(c, n) |
| 1503 struct compiling *c; | |
| 1504 node *n; | |
| 1505 { | |
|
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1506 object *v; |
| 69 | 1507 REQ(n, classdef); |
| 1508 /* | |
| 1509 classdef: 'class' NAME parameters ['=' baselist] ':' suite | |
| 1510 baselist: atom arguments (',' atom arguments)* | |
| 1511 arguments: '(' [testlist] ')' | |
| 1512 */ | |
|
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1513 if (NCH(n) == 7) |
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1514 com_bases(c, CHILD(n, 4)); |
|
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1515 else |
|
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1516 com_addoparg(c, LOAD_CONST, com_addconst(c, None)); |
| 86 | 1517 v = (object *)compile(n, c->c_filename); |
|
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1518 if (v == NULL) |
|
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1519 c->c_errors++; |
|
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1520 else { |
|
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1521 int i = com_addconst(c, v); |
|
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1522 com_addoparg(c, LOAD_CONST, i); |
|
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1523 com_addbyte(c, BUILD_FUNCTION); |
|
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1524 com_addbyte(c, UNARY_CALL); |
|
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1525 com_addbyte(c, BUILD_CLASS); |
|
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1526 com_addopname(c, STORE_NAME, CHILD(n, 1)); |
|
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1527 DECREF(v); |
|
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|
1528 } |
| 69 | 1529 } |
| 1530 | |
| 1531 static void | |
| 1532 com_node(c, n) | |
| 1533 struct compiling *c; | |
| 1534 node *n; | |
| 1535 { | |
| 1536 switch (TYPE(n)) { | |
| 1537 | |
| 1538 /* Definition nodes */ | |
| 1539 | |
| 1540 case funcdef: | |
| 1541 com_funcdef(c, n); | |
| 1542 break; | |
| 1543 case classdef: | |
| 1544 com_classdef(c, n); | |
| 1545 break; | |
| 1546 | |
| 1547 /* Trivial parse tree nodes */ | |
| 1548 | |
| 1549 case stmt: | |
| 86 | 1550 case flow_stmt: |
| 1551 com_node(c, CHILD(n, 0)); | |
| 1552 break; | |
| 1553 | |
| 69 | 1554 case simple_stmt: |
| 1555 case compound_stmt: | |
| 86 | 1556 com_addoparg(c, SET_LINENO, n->n_lineno); |
| 69 | 1557 com_node(c, CHILD(n, 0)); |
| 1558 break; | |
| 1559 | |
| 1560 /* Statement nodes */ | |
| 1561 | |
| 1562 case expr_stmt: | |
| 1563 com_expr_stmt(c, n); | |
| 1564 break; | |
| 1565 case print_stmt: | |
| 1566 com_print_stmt(c, n); | |
| 1567 break; | |
| 1568 case del_stmt: /* 'del' exprlist NEWLINE */ | |
| 1569 com_assign(c, CHILD(n, 1), 0/*delete*/); | |
| 1570 break; | |
| 1571 case pass_stmt: | |
| 1572 break; | |
| 1573 case break_stmt: | |
| 86 | 1574 if (c->c_loops == 0) { |
| 1575 err_setstr(TypeError, "'break' outside loop"); | |
| 1576 c->c_errors++; | |
| 1577 } | |
| 69 | 1578 com_addbyte(c, BREAK_LOOP); |
| 1579 break; | |
| 1580 case return_stmt: | |
| 1581 com_return_stmt(c, n); | |
| 1582 break; | |
| 1583 case raise_stmt: | |
| 1584 com_raise_stmt(c, n); | |
| 1585 break; | |
| 1586 case import_stmt: | |
| 1587 com_import_stmt(c, n); | |
| 1588 break; | |
| 1589 case if_stmt: | |
| 1590 com_if_stmt(c, n); | |
| 1591 break; | |
| 1592 case while_stmt: | |
| 1593 com_while_stmt(c, n); | |
| 1594 break; | |
| 1595 case for_stmt: | |
| 1596 com_for_stmt(c, n); | |
| 1597 break; | |
| 1598 case try_stmt: | |
| 1599 com_try_stmt(c, n); | |
| 1600 break; | |
| 1601 case suite: | |
| 1602 com_suite(c, n); | |
| 1603 break; | |
| 1604 | |
| 1605 /* Expression nodes */ | |
| 1606 | |
| 1607 case testlist: | |
| 1608 com_list(c, n); | |
| 1609 break; | |
| 1610 case test: | |
| 1611 com_test(c, n); | |
| 1612 break; | |
| 1613 case and_test: | |
| 1614 com_and_test(c, n); | |
| 1615 break; | |
| 1616 case not_test: | |
| 1617 com_not_test(c, n); | |
| 1618 break; | |
| 1619 case comparison: | |
| 1620 com_comparison(c, n); | |
| 1621 break; | |
| 1622 case exprlist: | |
| 1623 com_list(c, n); | |
| 1624 break; | |
| 1625 case expr: | |
| 1626 com_expr(c, n); | |
| 1627 break; | |
| 1628 case term: | |
| 1629 com_term(c, n); | |
| 1630 break; | |
| 1631 case factor: | |
| 1632 com_factor(c, n); | |
| 1633 break; | |
| 1634 case atom: | |
| 1635 com_atom(c, n); | |
| 1636 break; | |
| 1637 | |
| 1638 default: | |
| 1639 fprintf(stderr, "node type %d\n", TYPE(n)); | |
| 1640 err_setstr(SystemError, "com_node: unexpected node type"); | |
| 1641 c->c_errors++; | |
| 1642 } | |
| 1643 } | |
| 1644 | |
| 1645 static void com_fplist PROTO((struct compiling *, node *)); | |
| 1646 | |
| 1647 static void | |
| 1648 com_fpdef(c, n) | |
| 1649 struct compiling *c; | |
| 1650 node *n; | |
| 1651 { | |
| 1652 REQ(n, fpdef); /* fpdef: NAME | '(' fplist ')' */ | |
| 1653 if (TYPE(CHILD(n, 0)) == LPAR) | |
| 1654 com_fplist(c, CHILD(n, 1)); | |
| 1655 else | |
| 1656 com_addopname(c, STORE_NAME, CHILD(n, 0)); | |
| 1657 } | |
| 1658 | |
| 1659 static void | |
| 1660 com_fplist(c, n) | |
| 1661 struct compiling *c; | |
| 1662 node *n; | |
| 1663 { | |
| 1664 REQ(n, fplist); /* fplist: fpdef (',' fpdef)* */ | |
| 1665 if (NCH(n) == 1) { | |
| 1666 com_fpdef(c, CHILD(n, 0)); | |
| 1667 } | |
| 1668 else { | |
| 1669 int i; | |
| 1670 com_addoparg(c, UNPACK_TUPLE, (NCH(n)+1)/2); | |
| 1671 for (i = 0; i < NCH(n); i += 2) | |
| 1672 com_fpdef(c, CHILD(n, i)); | |
| 1673 } | |
| 1674 } | |
| 1675 | |
| 1676 static void | |
| 1677 com_file_input(c, n) | |
| 1678 struct compiling *c; | |
| 1679 node *n; | |
| 1680 { | |
| 1681 int i; | |
| 1682 REQ(n, file_input); /* (NEWLINE | stmt)* ENDMARKER */ | |
| 1683 for (i = 0; i < NCH(n); i++) { | |
| 1684 node *ch = CHILD(n, i); | |
| 1685 if (TYPE(ch) != ENDMARKER && TYPE(ch) != NEWLINE) | |
| 1686 com_node(c, ch); | |
| 1687 } | |
| 1688 } | |
| 1689 | |
| 1690 /* Top-level compile-node interface */ | |
| 1691 | |
| 1692 static void | |
| 1693 compile_funcdef(c, n) | |
| 1694 struct compiling *c; | |
| 1695 node *n; | |
| 1696 { | |
| 1697 node *ch; | |
| 1698 REQ(n, funcdef); /* funcdef: 'def' NAME parameters ':' suite */ | |
| 1699 ch = CHILD(n, 2); /* parameters: '(' [fplist] ')' */ | |
| 1700 ch = CHILD(ch, 1); /* ')' | fplist */ | |
| 1701 if (TYPE(ch) == RPAR) | |
| 1702 com_addbyte(c, REFUSE_ARGS); | |
| 1703 else { | |
| 1704 com_addbyte(c, REQUIRE_ARGS); | |
| 1705 com_fplist(c, ch); | |
| 1706 } | |
| 86 | 1707 c->c_infunction = 1; |
| 69 | 1708 com_node(c, CHILD(n, 4)); |
| 86 | 1709 c->c_infunction = 0; |
| 69 | 1710 com_addoparg(c, LOAD_CONST, com_addconst(c, None)); |
| 1711 com_addbyte(c, RETURN_VALUE); | |
| 1712 } | |
| 1713 | |
| 1714 static void | |
| 1715 compile_node(c, n) | |
| 1716 struct compiling *c; | |
| 1717 node *n; | |
| 1718 { | |
| 86 | 1719 com_addoparg(c, SET_LINENO, n->n_lineno); |
| 1720 | |
| 69 | 1721 switch (TYPE(n)) { |
| 1722 | |
|
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|
1723 case single_input: /* One interactive command */ |
| 69 | 1724 /* NEWLINE | simple_stmt | compound_stmt NEWLINE */ |
| 86 | 1725 com_addbyte(c, REFUSE_ARGS); |
| 69 | 1726 n = CHILD(n, 0); |
| 1727 if (TYPE(n) != NEWLINE) | |
| 1728 com_node(c, n); | |
| 86 | 1729 com_addoparg(c, LOAD_CONST, com_addconst(c, None)); |
| 1730 com_addbyte(c, RETURN_VALUE); | |
| 69 | 1731 break; |
| 1732 | |
|
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|
1733 case file_input: /* A whole file, or built-in function exec() */ |
| 86 | 1734 com_addbyte(c, REFUSE_ARGS); |
| 69 | 1735 com_file_input(c, n); |
| 86 | 1736 com_addoparg(c, LOAD_CONST, com_addconst(c, None)); |
| 1737 com_addbyte(c, RETURN_VALUE); | |
| 69 | 1738 break; |
| 1739 | |
|
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|
1740 case expr_input: /* Built-in function eval() */ |
| 86 | 1741 com_addbyte(c, REFUSE_ARGS); |
| 69 | 1742 com_node(c, CHILD(n, 0)); |
| 86 | 1743 com_addbyte(c, RETURN_VALUE); |
| 69 | 1744 break; |
| 1745 | |
|
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|
1746 case eval_input: /* Built-in function input() */ |
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|
1747 com_addbyte(c, REFUSE_ARGS); |
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|
1748 com_node(c, CHILD(n, 0)); |
|
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|
1749 com_addbyte(c, RETURN_VALUE); |
|
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|
1750 break; |
|
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|
1751 |
|
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|
1752 case funcdef: /* A function definition */ |
| 69 | 1753 compile_funcdef(c, n); |
| 1754 break; | |
| 1755 | |
|
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|
1756 case classdef: /* A class definition */ |
| 86 | 1757 /* 'class' NAME parameters ['=' baselist] ':' suite */ |
| 1758 com_addbyte(c, REFUSE_ARGS); | |
| 1759 com_node(c, CHILD(n, NCH(n)-1)); | |
| 1760 com_addbyte(c, LOAD_LOCALS); | |
| 1761 com_addbyte(c, RETURN_VALUE); | |
|
73
3028acaa56b0
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|
1762 break; |
|
3028acaa56b0
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|
1763 |
| 69 | 1764 default: |
| 1765 fprintf(stderr, "node type %d\n", TYPE(n)); | |
| 1766 err_setstr(SystemError, "compile_node: unexpected node type"); | |
| 1767 c->c_errors++; | |
| 1768 } | |
| 1769 } | |
| 1770 | |
|
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1771 /* Optimization for local and global variables. |
|
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1772 |
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1773 Attempt to replace all LOAD_NAME instructions that refer to a local |
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1774 variable with LOAD_LOCAL instructions, and all that refer to a global |
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1775 variable with LOAD_GLOBAL instructions. |
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1776 |
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1777 To find all local variables, we check all STORE_NAME and IMPORT_FROM |
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1778 instructions. This yields all local variables, including arguments, |
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1779 function definitions, class definitions and import statements. |
|
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1780 |
|
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|
1781 There is one leak: 'from foo import *' introduces local variables |
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1782 that we can't know while compiling. If this is the case, LOAD_GLOBAL |
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1783 instructions are not generated -- LOAD_NAME is left in place for |
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1784 globals, since it first checks for globals (LOAD_LOCAL is still used |
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1785 for recognized locals, since it doesn't hurt). |
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1786 |
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1787 This optimization means that using the same name as a global and |
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1788 as a local variable within the same scope is now illegal, which |
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1789 is a change to the language! Also using eval() to introduce new |
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1790 local variables won't work. But both were bad practice at best. |
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1791 |
|
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1792 The optimization doesn't save much: basically, it saves one |
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1793 unsuccessful dictionary lookup per global (or built-in) variable |
|
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1794 reference. On the (slow!) Mac Plus, with 4 local variables, |
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1795 this saving was measured to be about 0.18 ms. We might save more |
|
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1796 by using a different data structure to hold local variables, like |
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1797 an array indexed by variable number. |
|
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1798 |
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1799 NB: this modifies the string object co->co_code! |
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1800 */ |
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1801 |
|
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1802 static void |
|
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1803 optimizer(co) |
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1804 codeobject *co; |
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1805 { |
|
203
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1806 unsigned char *next_instr, *cur_instr; |
|
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1807 object *locals; |
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1808 int opcode; |
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1809 int oparg; |
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1810 object *name; |
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1811 int star_used; |
|
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1812 |
|
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1813 #define NEXTOP() (*next_instr++) |
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1814 #define NEXTARG() (next_instr += 2, (next_instr[-1]<<8) + next_instr[-2]) |
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1815 #define GETITEM(v, i) (getlistitem((v), (i))) |
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1816 #define GETNAMEOBJ(i) (GETITEM(co->co_names, (i))) |
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1817 |
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1818 locals = newdictobject(); |
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1819 if (locals == NULL) { |
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1820 err_clear(); |
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1821 return; /* For now, this is OK */ |
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1822 } |
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1823 |
|
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1824 next_instr = (unsigned char *) GETSTRINGVALUE(co->co_code); |
|
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1825 for (;;) { |
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1826 opcode = NEXTOP(); |
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1827 if (opcode == STOP_CODE) |
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1828 break; |
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1829 if (HAS_ARG(opcode)) |
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1830 oparg = NEXTARG(); |
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1831 if (opcode == STORE_NAME || opcode == IMPORT_FROM) { |
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1832 name = GETNAMEOBJ(oparg); |
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1833 if (dict2insert(locals, name, None) != 0) { |
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1834 DECREF(locals); |
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1835 return; /* Sorry */ |
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1836 } |
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1837 } |
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1838 } |
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1839 |
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1840 star_used = (dictlookup(locals, "*") != NULL); |
|
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1841 next_instr = (unsigned char *) GETSTRINGVALUE(co->co_code); |
|
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1842 for (;;) { |
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1843 cur_instr = next_instr; |
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1844 opcode = NEXTOP(); |
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1845 if (opcode == STOP_CODE) |
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1846 break; |
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1847 if (HAS_ARG(opcode)) |
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1848 oparg = NEXTARG(); |
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1849 if (opcode == LOAD_NAME) { |
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1850 name = GETNAMEOBJ(oparg); |
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1851 if (dictlookup(locals, getstringvalue(name)) != NULL) |
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1852 *cur_instr = LOAD_LOCAL; |
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1853 else if (!star_used) |
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1854 *cur_instr = LOAD_GLOBAL; |
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1855 } |
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1856 } |
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1857 |
|
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1858 DECREF(locals); |
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1859 } |
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1860 |
| 69 | 1861 codeobject * |
| 86 | 1862 compile(n, filename) |
| 69 | 1863 node *n; |
| 86 | 1864 char *filename; |
| 69 | 1865 { |
| 1866 struct compiling sc; | |
| 1867 codeobject *co; | |
| 86 | 1868 if (!com_init(&sc, filename)) |
| 69 | 1869 return NULL; |
| 1870 compile_node(&sc, n); | |
| 1871 com_done(&sc); | |
| 1872 if (sc.c_errors == 0) | |
| 86 | 1873 co = newcodeobject(sc.c_code, sc.c_consts, sc.c_names, filename); |
| 69 | 1874 else |
| 1875 co = NULL; | |
| 1876 com_free(&sc); | |
|
176
229168a2fe28
Added error checking for numeric constants; added local/global variable
Guido van Rossum <guido@python.org>
parents:
160
diff
changeset
|
1877 if (co != NULL) |
|
229168a2fe28
Added error checking for numeric constants; added local/global variable
Guido van Rossum <guido@python.org>
parents:
160
diff
changeset
|
1878 optimizer(co); |
| 69 | 1879 return co; |
| 1880 } |