1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 */ 6 7 #ifndef lint 8 static char sccsid[] = "@(#)c.c 5.6 (Berkeley) 07/02/87"; 9 #endif not lint 10 11 static char rcsid[] = "$Header: c.c,v 1.5 84/12/26 10:38:23 linton Exp $"; 12 13 /* 14 * C-dependent symbol routines. 15 */ 16 17 #include "defs.h" 18 #include "symbols.h" 19 #include "printsym.h" 20 #include "languages.h" 21 #include "c.h" 22 #include "tree.h" 23 #include "eval.h" 24 #include "operators.h" 25 #include "mappings.h" 26 #include "process.h" 27 #include "runtime.h" 28 #include "machine.h" 29 30 #ifndef public 31 # include "tree.h" 32 #endif 33 34 #define isdouble(range) ( \ 35 range->symvalue.rangev.upper == 0 and range->symvalue.rangev.lower > 0 \ 36 ) 37 38 #define isrange(t, name) (t->class == RANGE and istypename(t->type, name)) 39 40 private Language langC; 41 42 /* 43 * Initialize C language information. 44 */ 45 46 public c_init() 47 { 48 langC = language_define("c", ".c"); 49 language_setop(langC, L_PRINTDECL, c_printdecl); 50 language_setop(langC, L_PRINTVAL, c_printval); 51 language_setop(langC, L_TYPEMATCH, c_typematch); 52 language_setop(langC, L_BUILDAREF, c_buildaref); 53 language_setop(langC, L_EVALAREF, c_evalaref); 54 language_setop(langC, L_MODINIT, c_modinit); 55 language_setop(langC, L_HASMODULES, c_hasmodules); 56 language_setop(langC, L_PASSADDR, c_passaddr); 57 } 58 59 /* 60 * Test if two types are compatible. 61 */ 62 63 public Boolean c_typematch(type1, type2) 64 Symbol type1, type2; 65 { 66 Boolean b; 67 register Symbol t1, t2, tmp; 68 69 t1 = type1; 70 t2 = type2; 71 if (t1 == t2) { 72 b = true; 73 } else { 74 t1 = rtype(t1); 75 t2 = rtype(t2); 76 if (t1 == t_char->type or t1 == t_int->type or t1 == t_real->type) { 77 tmp = t1; 78 t1 = t2; 79 t2 = tmp; 80 } 81 b = (Boolean) ( 82 ( 83 isrange(t1, "int") and 84 (t2 == t_int->type or t2 == t_char->type) 85 ) or ( 86 isrange(t1, "char") and 87 (t2 == t_char->type or t2 == t_int->type) 88 ) or ( 89 t1->class == RANGE and isdouble(t1) and t2 == t_real->type 90 ) or ( 91 t1->class == RANGE and t2->class == RANGE and 92 t1->symvalue.rangev.lower == t2->symvalue.rangev.lower and 93 t1->symvalue.rangev.upper == t2->symvalue.rangev.upper 94 ) or ( 95 t1->type == t2->type and ( 96 (t1->class == t2->class) or 97 (t1->class == SCAL and t2->class == CONST) or 98 (t1->class == CONST and t2->class == SCAL) 99 ) 100 ) or ( 101 t1->class == PTR and c_typematch(t1->type, t_char) and 102 t2->class == ARRAY and c_typematch(t2->type, t_char) and 103 t2->language == primlang 104 ) 105 ); 106 } 107 return b; 108 } 109 110 /* 111 * Print out the declaration of a C variable. 112 */ 113 114 public c_printdecl(s) 115 Symbol s; 116 { 117 printdecl(s, 0); 118 } 119 120 private printdecl(s, indent) 121 register Symbol s; 122 Integer indent; 123 { 124 register Symbol t; 125 Boolean semicolon, newline; 126 127 semicolon = true; 128 newline = true; 129 if (indent > 0) { 130 printf("%*c", indent, ' '); 131 } 132 if (s->class == TYPE) { 133 printf("typedef "); 134 } 135 switch (s->class) { 136 case CONST: 137 if (s->type->class == SCAL) { 138 printf("enumeration constant with value "); 139 eval(s->symvalue.constval); 140 c_printval(s); 141 } else { 142 printf("const %s = ", symname(s)); 143 printval(s); 144 } 145 break; 146 147 case TYPE: 148 case VAR: 149 if (s->class != TYPE and s->level < 0) { 150 printf("register "); 151 } 152 if (s->type->class == ARRAY) { 153 printtype(s->type, s->type->type, indent); 154 t = rtype(s->type->chain); 155 assert(t->class == RANGE); 156 printf(" %s[%d]", symname(s), t->symvalue.rangev.upper + 1); 157 } else { 158 printtype(s, s->type, indent); 159 if (s->type->class != PTR) { 160 printf(" "); 161 } 162 printf("%s", symname(s)); 163 } 164 break; 165 166 case FIELD: 167 if (s->type->class == ARRAY) { 168 printtype(s->type, s->type->type, indent); 169 t = rtype(s->type->chain); 170 assert(t->class == RANGE); 171 printf(" %s[%d]", symname(s), t->symvalue.rangev.upper + 1); 172 } else { 173 printtype(s, s->type, indent); 174 if (s->type->class != PTR) { 175 printf(" "); 176 } 177 printf("%s", symname(s)); 178 } 179 if (isbitfield(s)) { 180 printf(" : %d", s->symvalue.field.length); 181 } 182 break; 183 184 case TAG: 185 if (s->type == nil) { 186 findtype(s); 187 if (s->type == nil) { 188 error("unexpected missing type information"); 189 } 190 } 191 printtype(s, s->type, indent); 192 break; 193 194 case RANGE: 195 case ARRAY: 196 case RECORD: 197 case VARNT: 198 case PTR: 199 case FFUNC: 200 semicolon = false; 201 printtype(s, s, indent); 202 break; 203 204 case SCAL: 205 printf("(enumeration constant, value %d)", s->symvalue.iconval); 206 break; 207 208 case PROC: 209 semicolon = false; 210 printf("%s", symname(s)); 211 c_listparams(s); 212 newline = false; 213 break; 214 215 case FUNC: 216 semicolon = false; 217 if (not istypename(s->type, "void")) { 218 printtype(s, s->type, indent); 219 printf(" "); 220 } 221 printf("%s", symname(s)); 222 c_listparams(s); 223 newline = false; 224 break; 225 226 case MODULE: 227 semicolon = false; 228 printf("source file \"%s.c\"", symname(s)); 229 break; 230 231 case PROG: 232 semicolon = false; 233 printf("executable file \"%s\"", symname(s)); 234 break; 235 236 default: 237 printf("[%s]", classname(s)); 238 break; 239 } 240 if (semicolon) { 241 putchar(';'); 242 } 243 if (newline) { 244 putchar('\n'); 245 } 246 } 247 248 /* 249 * Recursive whiz-bang procedure to print the type portion 250 * of a declaration. 251 * 252 * The symbol associated with the type is passed to allow 253 * searching for type names without getting "type blah = blah". 254 */ 255 256 private printtype(s, t, indent) 257 Symbol s; 258 Symbol t; 259 Integer indent; 260 { 261 register Symbol i; 262 long r0, r1; 263 register String p; 264 265 checkref(s); 266 checkref(t); 267 switch (t->class) { 268 case VAR: 269 case CONST: 270 case PROC: 271 panic("printtype: class %s", classname(t)); 272 break; 273 274 case ARRAY: 275 printf("array["); 276 i = t->chain; 277 if (i != nil) { 278 for (;;) { 279 printtype(i, i, indent); 280 i = i->chain; 281 if (i == nil) { 282 break; 283 } 284 printf(", "); 285 } 286 } 287 printf("] of "); 288 printtype(t, t->type, indent); 289 break; 290 291 case RECORD: 292 case VARNT: 293 printf("%s ", c_classname(t)); 294 if (s->name != nil and s->class == TAG) { 295 p = symname(s); 296 if (p[0] == '$' and p[1] == '$') { 297 printf("%s ", &p[2]); 298 } else { 299 printf("%s ", p); 300 } 301 } 302 printf("{\n"); 303 for (i = t->chain; i != nil; i = i->chain) { 304 assert(i->class == FIELD); 305 printdecl(i, indent+4); 306 } 307 if (indent > 0) { 308 printf("%*c", indent, ' '); 309 } 310 printf("}"); 311 break; 312 313 case RANGE: 314 r0 = t->symvalue.rangev.lower; 315 r1 = t->symvalue.rangev.upper; 316 if (istypename(t->type, "char")) { 317 if (r0 < 0x20 or r0 > 0x7e) { 318 printf("%ld..", r0); 319 } else { 320 printf("'%c'..", (char) r0); 321 } 322 if (r1 < 0x20 or r1 > 0x7e) { 323 printf("\\%lo", r1); 324 } else { 325 printf("'%c'", (char) r1); 326 } 327 } else if (r0 > 0 and r1 == 0) { 328 printf("%ld byte real", r0); 329 } else if (r0 >= 0) { 330 printf("%lu..%lu", r0, r1); 331 } else { 332 printf("%ld..%ld", r0, r1); 333 } 334 break; 335 336 case PTR: 337 printtype(t, t->type, indent); 338 if (t->type->class != PTR) { 339 printf(" "); 340 } 341 printf("*"); 342 break; 343 344 case FUNC: 345 case FFUNC: 346 printtype(t, t->type, indent); 347 printf("()"); 348 break; 349 350 case TYPE: 351 if (t->name != nil) { 352 printname(stdout, t); 353 } else { 354 printtype(t, t->type, indent); 355 } 356 break; 357 358 case TYPEREF: 359 printf("@%s", symname(t)); 360 break; 361 362 case SCAL: 363 printf("enum "); 364 if (s->name != nil and s->class == TAG) { 365 printf("%s ", symname(s)); 366 } 367 printf("{ "); 368 i = t->chain; 369 if (i != nil) { 370 for (;;) { 371 printf("%s", symname(i)); 372 i = i->chain; 373 if (i == nil) break; 374 printf(", "); 375 } 376 } 377 printf(" }"); 378 break; 379 380 case TAG: 381 if (t->type == nil) { 382 printf("unresolved tag %s", symname(t)); 383 } else { 384 i = rtype(t->type); 385 printf("%s %s", c_classname(i), symname(t)); 386 } 387 break; 388 389 default: 390 printf("(class %d)", t->class); 391 break; 392 } 393 } 394 395 /* 396 * List the parameters of a procedure or function. 397 * No attempt is made to combine like types. 398 */ 399 400 public c_listparams(s) 401 Symbol s; 402 { 403 register Symbol t; 404 405 putchar('('); 406 for (t = s->chain; t != nil; t = t->chain) { 407 printf("%s", symname(t)); 408 if (t->chain != nil) { 409 printf(", "); 410 } 411 } 412 putchar(')'); 413 if (s->chain != nil) { 414 printf("\n"); 415 for (t = s->chain; t != nil; t = t->chain) { 416 if (t->class != VAR) { 417 panic("unexpected class %d for parameter", t->class); 418 } 419 printdecl(t, 0); 420 } 421 } else { 422 putchar('\n'); 423 } 424 } 425 426 /* 427 * Print out the value on the top of the expression stack 428 * in the format for the type of the given symbol. 429 */ 430 431 public c_printval(s) 432 Symbol s; 433 { 434 register Symbol t; 435 register Address a; 436 integer i, len; 437 register String str; 438 439 switch (s->class) { 440 case CONST: 441 case TYPE: 442 case VAR: 443 case REF: 444 case FVAR: 445 case TAG: 446 c_printval(s->type); 447 break; 448 449 case FIELD: 450 if (isbitfield(s)) { 451 i = 0; 452 popn(size(s), &i); 453 i = extractfield(i, s); 454 t = rtype(s->type); 455 if (t->class == SCAL) { 456 printEnum(i, t); 457 } else { 458 printRangeVal(i, t); 459 } 460 } else { 461 c_printval(s->type); 462 } 463 break; 464 465 case ARRAY: 466 t = rtype(s->type); 467 if ((t->class == RANGE and istypename(t->type, "char")) or 468 t == t_char->type 469 ) { 470 len = size(s); 471 str = (String) (sp -= len); 472 if (s->language != primlang) { 473 putchar('"'); 474 } 475 while (--len > 0 and *str != '\0') { 476 printchar(*str++); 477 } 478 if (*str != '\0') { /* XXX - pitch trailing null */ 479 printchar(*str); 480 } 481 if (s->language != primlang) { 482 putchar('"'); 483 } 484 } else { 485 printarray(s); 486 } 487 break; 488 489 case RECORD: 490 c_printstruct(s); 491 break; 492 493 case RANGE: 494 if (s == t_boolean->type or istypename(s->type, "boolean")) { 495 printRangeVal(popsmall(s), s); 496 } else if (s == t_char->type or istypename(s->type, "char")) { 497 printRangeVal(pop(char), s); 498 } else if (s == t_real->type or isdouble(s)) { 499 switch (s->symvalue.rangev.lower) { 500 case sizeof(float): 501 prtreal(pop(float)); 502 break; 503 504 case sizeof(double): 505 prtreal(pop(double)); 506 break; 507 508 default: 509 panic("bad real size %d", t->symvalue.rangev.lower); 510 break; 511 } 512 } else { 513 printRangeVal(popsmall(s), s); 514 } 515 break; 516 517 case PTR: 518 t = rtype(s->type); 519 a = pop(Address); 520 if (a == 0) { 521 printf("(nil)"); 522 } else if (t->class == RANGE and istypename(t->type, "char")) { 523 printString(a, (boolean) (s->language != primlang)); 524 } else { 525 printf("0x%x", a); 526 } 527 break; 528 529 case SCAL: 530 i = pop(Integer); 531 printEnum(i, s); 532 break; 533 534 /* 535 * Unresolved structure pointers? 536 */ 537 case BADUSE: 538 a = pop(Address); 539 printf("@%x", a); 540 break; 541 542 default: 543 if (ord(s->class) > ord(TYPEREF)) { 544 panic("printval: bad class %d", ord(s->class)); 545 } 546 sp -= size(s); 547 printf("[%s]", c_classname(s)); 548 break; 549 } 550 } 551 552 /* 553 * Print out a C structure. 554 */ 555 556 private c_printstruct (s) 557 Symbol s; 558 { 559 Symbol f; 560 Stack *savesp; 561 integer n, off, len; 562 563 sp -= size(s); 564 savesp = sp; 565 printf("("); 566 f = s->chain; 567 for (;;) { 568 off = f->symvalue.field.offset; 569 len = f->symvalue.field.length; 570 n = (off + len + BITSPERBYTE - 1) div BITSPERBYTE; 571 sp += n; 572 printf("%s = ", symname(f)); 573 c_printval(f); 574 sp = savesp; 575 f = f->chain; 576 if (f == nil) break; 577 printf(", "); 578 } 579 printf(")"); 580 } 581 582 /* 583 * Return the C name for the particular class of a symbol. 584 */ 585 586 public String c_classname(s) 587 Symbol s; 588 { 589 String str; 590 591 switch (s->class) { 592 case RECORD: 593 str = "struct"; 594 break; 595 596 case VARNT: 597 str = "union"; 598 break; 599 600 case SCAL: 601 str = "enum"; 602 break; 603 604 default: 605 str = classname(s); 606 } 607 return str; 608 } 609 610 public Node c_buildaref(a, slist) 611 Node a, slist; 612 { 613 register Symbol t; 614 register Node p; 615 Symbol etype, atype, eltype; 616 Node r, esub; 617 618 t = rtype(a->nodetype); 619 eltype = t->type; 620 if (t->class == PTR) { 621 p = slist->value.arg[0]; 622 if (not compatible(p->nodetype, t_int)) { 623 beginerrmsg(); 624 fprintf(stderr, "subscript must be integer-compatible"); 625 enderrmsg(); 626 } 627 r = build(O_MUL, p, build(O_LCON, (long) size(eltype))); 628 r = build(O_ADD, build(O_RVAL, a), r); 629 r->nodetype = eltype; 630 } else if (t->class != ARRAY) { 631 beginerrmsg(); 632 fprintf(stderr, "\""); 633 prtree(stderr, a); 634 fprintf(stderr, "\" is not an array"); 635 enderrmsg(); 636 } else { 637 r = a; 638 p = slist; 639 t = t->chain; 640 for (; p != nil and t != nil; p = p->value.arg[1], t = t->chain) { 641 esub = p->value.arg[0]; 642 etype = rtype(esub->nodetype); 643 atype = rtype(t); 644 if (not compatible(atype, etype)) { 645 beginerrmsg(); 646 fprintf(stderr, "subscript \""); 647 prtree(stderr, esub); 648 fprintf(stderr, "\" is the wrong type"); 649 enderrmsg(); 650 } 651 r = build(O_INDEX, r, esub); 652 r->nodetype = eltype; 653 } 654 if (p != nil or t != nil) { 655 beginerrmsg(); 656 if (p != nil) { 657 fprintf(stderr, "too many subscripts for \""); 658 } else { 659 fprintf(stderr, "not enough subscripts for \""); 660 } 661 prtree(stderr, a); 662 fprintf(stderr, "\""); 663 enderrmsg(); 664 } 665 } 666 return r; 667 } 668 669 /* 670 * Evaluate a subscript index. 671 */ 672 673 public c_evalaref(s, base, i) 674 Symbol s; 675 Address base; 676 long i; 677 { 678 Symbol t; 679 long lb, ub; 680 681 t = rtype(s); 682 s = t->chain; 683 lb = s->symvalue.rangev.lower; 684 ub = s->symvalue.rangev.upper; 685 if (i < lb or i > ub) { 686 warning("subscript out of range"); 687 } 688 push(long, base + (i - lb) * size(t->type)); 689 } 690 691 /* 692 * Initialize typetable information. 693 */ 694 695 public c_modinit (typetable) 696 Symbol typetable[]; 697 { 698 /* nothing right now */ 699 } 700 701 public boolean c_hasmodules () 702 { 703 return false; 704 } 705 706 public boolean c_passaddr (param, exprtype) 707 Symbol param, exprtype; 708 { 709 boolean b; 710 Symbol t; 711 712 t = rtype(exprtype); 713 b = (boolean) (t->class == ARRAY); 714 return b; 715 } 716