1 /* Copyright (c) 1979 Regents of the University of California */ 2 3 static char sccsid[] = "@(#)stat.c 1.4 03/11/81"; 4 5 #include "whoami.h" 6 #include "0.h" 7 #include "tree.h" 8 #include "objfmt.h" 9 #ifdef PC 10 # include "pcops.h" 11 # include "pc.h" 12 #endif PC 13 14 int cntstat; 15 short cnts = 3; 16 #include "opcode.h" 17 18 /* 19 * Statement list 20 */ 21 statlist(r) 22 int *r; 23 { 24 register *sl; 25 26 for (sl=r; sl != NIL; sl=sl[2]) 27 statement(sl[1]); 28 } 29 30 /* 31 * Statement 32 */ 33 statement(r) 34 int *r; 35 { 36 register *s; 37 register struct nl *snlp; 38 struct tmps soffset; 39 40 s = r; 41 snlp = nlp; 42 soffset = sizes[cbn].curtmps; 43 top: 44 if (cntstat) { 45 cntstat = 0; 46 putcnt(); 47 } 48 if (s == NIL) 49 return; 50 line = s[1]; 51 if (s[0] == T_LABEL) { 52 labeled(s[2]); 53 s = s[3]; 54 noreach = 0; 55 cntstat = 1; 56 goto top; 57 } 58 if (noreach) { 59 noreach = 0; 60 warning(); 61 error("Unreachable statement"); 62 } 63 switch (s[0]) { 64 case T_PCALL: 65 putline(); 66 # ifdef OBJ 67 proc(s); 68 # endif OBJ 69 # ifdef PC 70 pcproc( s ); 71 # endif PC 72 break; 73 case T_ASGN: 74 putline(); 75 asgnop(s); 76 break; 77 case T_GOTO: 78 putline(); 79 gotoop(s[2]); 80 noreach = 1; 81 cntstat = 1; 82 break; 83 default: 84 level++; 85 switch (s[0]) { 86 default: 87 panic("stat"); 88 case T_IF: 89 case T_IFEL: 90 ifop(s); 91 break; 92 case T_WHILE: 93 whilop(s); 94 noreach = 0; 95 break; 96 case T_REPEAT: 97 repop(s); 98 break; 99 case T_FORU: 100 case T_FORD: 101 forop(s); 102 noreach = 0; 103 break; 104 case T_BLOCK: 105 statlist(s[2]); 106 break; 107 case T_CASE: 108 putline(); 109 # ifdef OBJ 110 caseop(s); 111 # endif OBJ 112 # ifdef PC 113 pccaseop( s ); 114 # endif PC 115 break; 116 case T_WITH: 117 withop(s); 118 break; 119 case T_ASRT: 120 putline(); 121 asrtop(s); 122 break; 123 } 124 --level; 125 if (gotos[cbn]) 126 ungoto(); 127 break; 128 } 129 /* 130 * Free the temporary name list entries defined in 131 * expressions, e.g. STRs, and WITHPTRs from withs. 132 */ 133 nlfree(snlp); 134 /* 135 * free any temporaries allocated for this statement 136 * these come from strings and sets. 137 */ 138 tmpfree(&soffset); 139 } 140 141 ungoto() 142 { 143 register struct nl *p; 144 145 for (p = gotos[cbn]; p != NIL; p = p->chain) 146 if ((p->nl_flags & NFORWD) != 0) { 147 if (p->value[NL_GOLEV] != NOTYET) 148 if (p->value[NL_GOLEV] > level) 149 p->value[NL_GOLEV] = level; 150 } else 151 if (p->value[NL_GOLEV] != DEAD) 152 if (p->value[NL_GOLEV] > level) 153 p->value[NL_GOLEV] = DEAD; 154 } 155 156 putcnt() 157 { 158 159 if (monflg == 0) { 160 return; 161 } 162 inccnt( getcnt() ); 163 } 164 165 int 166 getcnt() 167 { 168 169 return ++cnts; 170 } 171 172 inccnt( counter ) 173 int counter; 174 { 175 176 # ifdef OBJ 177 put(2, O_COUNT, counter ); 178 # endif OBJ 179 # ifdef PC 180 putRV( PCPCOUNT , 0 , counter * sizeof (long) , P2INT ); 181 putleaf( P2ICON , 1 , 0 , P2INT , 0 ); 182 putop( P2ASG P2PLUS , P2INT ); 183 putdot( filename , line ); 184 # endif PC 185 } 186 187 putline() 188 { 189 190 # ifdef OBJ 191 if (opt('p') != 0) 192 put(2, O_LINO, line); 193 # endif OBJ 194 # ifdef PC 195 static lastline; 196 197 if ( line != lastline ) { 198 stabline( line ); 199 lastline = line; 200 } 201 if ( opt( 'p' ) ) { 202 if ( opt('t') ) { 203 putleaf( P2ICON , 0 , 0 , ADDTYPE( P2FTN | P2INT , P2PTR ) 204 , "_LINO" ); 205 putop( P2UNARY P2CALL , P2INT ); 206 putdot( filename , line ); 207 } else { 208 putRV( STMTCOUNT , 0 , 0 , P2INT ); 209 putleaf( P2ICON , 1 , 0 , P2INT , 0 ); 210 putop( P2ASG P2PLUS , P2INT ); 211 putdot( filename , line ); 212 } 213 } 214 # endif PC 215 } 216 217 /* 218 * With varlist do stat 219 * 220 * With statement requires an extra word 221 * in automatic storage for each level of withing. 222 * These indirect pointers are initialized here, and 223 * the scoping effect of the with statement occurs 224 * because lookup examines the field names of the records 225 * associated with the WITHPTRs on the withlist. 226 */ 227 withop(s) 228 int *s; 229 { 230 register *p; 231 register struct nl *r; 232 int i; 233 int *swl; 234 235 putline(); 236 swl = withlist; 237 for (p = s[2]; p != NIL; p = p[2]) { 238 i = tmpalloc(sizeof(int *), INT_TYP, REGOK); 239 # ifdef OBJ 240 put(2, O_LV | cbn <<8+INDX, i ); 241 # endif OBJ 242 # ifdef PC 243 putRV( 0 , cbn , i , P2PTR|P2STRTY ); 244 # endif PC 245 r = lvalue(p[1], MOD , LREQ ); 246 if (r == NIL) 247 continue; 248 if (r->class != RECORD) { 249 error("Variable in with statement refers to %s, not to a record", nameof(r)); 250 continue; 251 } 252 r = defnl(0, WITHPTR, r, i); 253 r->nl_next = withlist; 254 withlist = r; 255 # ifdef OBJ 256 put(1, PTR_AS); 257 # endif OBJ 258 # ifdef PC 259 putop( P2ASSIGN , P2PTR|P2STRTY ); 260 putdot( filename , line ); 261 # endif PC 262 } 263 statement(s[3]); 264 withlist = swl; 265 } 266 267 extern flagwas; 268 /* 269 * var := expr 270 */ 271 asgnop(r) 272 int *r; 273 { 274 register struct nl *p; 275 register *av; 276 277 if (r == NIL) 278 return (NIL); 279 /* 280 * Asgnop's only function is 281 * to handle function variable 282 * assignments. All other assignment 283 * stuff is handled by asgnop1. 284 * the if below checks for unqualified lefthandside: 285 * necessary for fvars. 286 */ 287 av = r[2]; 288 if (av != NIL && av[0] == T_VAR && av[3] == NIL) { 289 p = lookup1(av[2]); 290 if (p != NIL) 291 p->nl_flags = flagwas; 292 if (p != NIL && p->class == FVAR) { 293 /* 294 * Give asgnop1 the func 295 * which is the chain of 296 * the FVAR. 297 */ 298 p->nl_flags |= NUSED|NMOD; 299 p = p->chain; 300 if (p == NIL) { 301 rvalue(r[3], NIL , RREQ ); 302 return; 303 } 304 # ifdef OBJ 305 put(2, O_LV | bn << 8+INDX, (int)p->value[NL_OFFS]); 306 if (isa(p->type, "i") && width(p->type) == 1) 307 asgnop1(r, nl+T2INT); 308 else 309 asgnop1(r, p->type); 310 # endif OBJ 311 # ifdef PC 312 /* 313 * this should be the lvalue of the fvar, 314 * but since the second pass knows to use 315 * the address of the left operand of an 316 * assignment, what i want here is an rvalue. 317 * see note in funchdr about fvar allocation. 318 */ 319 p = p -> ptr[ NL_FVAR ]; 320 putRV( p -> symbol , bn , p -> value[ NL_OFFS ] 321 , p2type( p -> type ) ); 322 asgnop1( r , p -> type ); 323 # endif PC 324 return; 325 } 326 } 327 asgnop1(r, NIL); 328 } 329 330 /* 331 * Asgnop1 handles all assignments. 332 * If p is not nil then we are assigning 333 * to a function variable, otherwise 334 * we look the variable up ourselves. 335 */ 336 struct nl * 337 asgnop1(r, p) 338 int *r; 339 register struct nl *p; 340 { 341 register struct nl *p1; 342 int w; 343 344 if (r == NIL) 345 return (NIL); 346 if (p == NIL) { 347 # ifdef OBJ 348 p = lvalue(r[2], MOD|ASGN|NOUSE , LREQ ); 349 w = width(p); 350 # endif OBJ 351 # ifdef PC 352 /* 353 * since the second pass knows that it should reference 354 * the lefthandside of asignments, what i need here is 355 * an rvalue. 356 */ 357 p = lvalue( r[2] , MOD|ASGN|NOUSE , RREQ ); 358 # endif PC 359 if ( p == NIL ) { 360 rvalue( r[3] , NIL , RREQ ); 361 return NIL; 362 } 363 } 364 # ifdef OBJ 365 /* 366 * assigning to the return value, which is at least 367 * of width two since it resides on the stack 368 */ 369 else { 370 w = width(p); 371 if (w < 2) 372 w = 2; 373 } 374 p1 = rvalue(r[3], p , RREQ ); 375 # endif OBJ 376 # ifdef PC 377 /* 378 * if this is a scalar assignment, 379 * then i want to rvalue the righthandside. 380 * if this is a structure assignment, 381 * then i want an lvalue to the righthandside. 382 * that's what the intermediate form sez. 383 */ 384 switch ( classify( p ) ) { 385 case TINT: 386 case TCHAR: 387 case TBOOL: 388 case TSCAL: 389 precheck( p , "_RANG4" , "_RSNG4" ); 390 case TDOUBLE: 391 case TPTR: 392 p1 = rvalue( r[3] , p , RREQ ); 393 break; 394 default: 395 p1 = rvalue( r[3] , p , LREQ ); 396 break; 397 } 398 # endif PC 399 if (p1 == NIL) 400 return (NIL); 401 if (incompat(p1, p, r[3])) { 402 cerror("Type of expression clashed with type of variable in assignment"); 403 return (NIL); 404 } 405 switch (classify(p)) { 406 case TINT: 407 case TBOOL: 408 case TCHAR: 409 case TSCAL: 410 # ifdef OBJ 411 rangechk(p, p1); 412 # endif OBJ 413 # ifdef PC 414 postcheck( p ); 415 # endif PC 416 case TDOUBLE: 417 case TPTR: 418 # ifdef OBJ 419 gen(O_AS2, O_AS2, w, width(p1)); 420 # endif OBJ 421 # ifdef PC 422 putop( P2ASSIGN , p2type( p ) ); 423 putdot( filename , line ); 424 # endif PC 425 break; 426 default: 427 # ifdef OBJ 428 put(2, O_AS, w); 429 # endif OBJ 430 # ifdef PC 431 putstrop( P2STASG , p2type( p ) 432 , lwidth( p ) , align( p ) ); 433 putdot( filename , line ); 434 # endif PC 435 } 436 return (p); /* Used by for statement */ 437 } 438 439 /* 440 * if expr then stat [ else stat ] 441 */ 442 ifop(r) 443 int *r; 444 { 445 register struct nl *p; 446 register l1, l2; /* l1 is start of else, l2 is end of else */ 447 int goc; 448 bool nr; 449 450 goc = gocnt; 451 if (r == NIL) 452 return; 453 putline(); 454 p = rvalue(r[2], NIL , RREQ ); 455 if (p == NIL) { 456 statement(r[3]); 457 noreach = 0; 458 statement(r[4]); 459 noreach = 0; 460 return; 461 } 462 if (isnta(p, "b")) { 463 error("Type of expression in if statement must be Boolean, not %s", nameof(p)); 464 statement(r[3]); 465 noreach = 0; 466 statement(r[4]); 467 noreach = 0; 468 return; 469 } 470 # ifdef OBJ 471 l1 = put(2, O_IF, getlab()); 472 # endif OBJ 473 # ifdef PC 474 l1 = getlab(); 475 putleaf( P2ICON , l1 , 0 , P2INT , 0 ); 476 putop( P2CBRANCH , P2INT ); 477 putdot( filename , line ); 478 # endif PC 479 putcnt(); 480 statement(r[3]); 481 nr = noreach; 482 if (r[4] != NIL) { 483 /* 484 * else stat 485 */ 486 --level; 487 ungoto(); 488 ++level; 489 # ifdef OBJ 490 l2 = put(2, O_TRA, getlab()); 491 # endif OBJ 492 # ifdef PC 493 l2 = getlab(); 494 putjbr( l2 ); 495 # endif PC 496 patch(l1); 497 noreach = 0; 498 statement(r[4]); 499 noreach = (noreach && nr); 500 l1 = l2; 501 } else 502 noreach = 0; 503 patch(l1); 504 if (goc != gocnt) 505 putcnt(); 506 } 507 508 /* 509 * while expr do stat 510 */ 511 whilop(r) 512 int *r; 513 { 514 register struct nl *p; 515 register l1, l2; 516 int goc; 517 518 goc = gocnt; 519 if (r == NIL) 520 return; 521 putlab(l1 = getlab()); 522 putline(); 523 p = rvalue(r[2], NIL , RREQ ); 524 if (p == NIL) { 525 statement(r[3]); 526 noreach = 0; 527 return; 528 } 529 if (isnta(p, "b")) { 530 error("Type of expression in while statement must be Boolean, not %s", nameof(p)); 531 statement(r[3]); 532 noreach = 0; 533 return; 534 } 535 l2 = getlab(); 536 # ifdef OBJ 537 put(2, O_IF, l2); 538 # endif OBJ 539 # ifdef PC 540 putleaf( P2ICON , l2 , 0 , P2INT , 0 ); 541 putop( P2CBRANCH , P2INT ); 542 putdot( filename , line ); 543 # endif PC 544 putcnt(); 545 statement(r[3]); 546 # ifdef OBJ 547 put(2, O_TRA, l1); 548 # endif OBJ 549 # ifdef PC 550 putjbr( l1 ); 551 # endif PC 552 patch(l2); 553 if (goc != gocnt) 554 putcnt(); 555 } 556 557 /* 558 * repeat stat* until expr 559 */ 560 repop(r) 561 int *r; 562 { 563 register struct nl *p; 564 register l; 565 int goc; 566 567 goc = gocnt; 568 if (r == NIL) 569 return; 570 l = putlab(getlab()); 571 putcnt(); 572 statlist(r[2]); 573 line = r[1]; 574 p = rvalue(r[3], NIL , RREQ ); 575 if (p == NIL) 576 return; 577 if (isnta(p,"b")) { 578 error("Until expression type must be Boolean, not %s, in repeat statement", nameof(p)); 579 return; 580 } 581 # ifdef OBJ 582 put(2, O_IF, l); 583 # endif OBJ 584 # ifdef PC 585 putleaf( P2ICON , l , 0 , P2INT , 0 ); 586 putop( P2CBRANCH , P2INT ); 587 putdot( filename , line ); 588 # endif PC 589 if (goc != gocnt) 590 putcnt(); 591 } 592 593 /* 594 * assert expr 595 */ 596 asrtop(r) 597 register int *r; 598 { 599 register struct nl *q; 600 601 if (opt('s')) { 602 standard(); 603 error("Assert statement is non-standard"); 604 } 605 if (!opt('t')) 606 return; 607 r = r[2]; 608 # ifdef OBJ 609 q = rvalue((int *) r, NLNIL , RREQ ); 610 # endif OBJ 611 # ifdef PC 612 putleaf( P2ICON , 0 , 0 613 , ADDTYPE( P2FTN | P2INT , P2PTR ) , "_ASRT" ); 614 q = stkrval( r , NLNIL , RREQ ); 615 # endif PC 616 if (q == NIL) 617 return; 618 if (isnta(q, "b")) 619 error("Assert expression must be Boolean, not %ss", nameof(q)); 620 # ifdef OBJ 621 put(1, O_ASRT); 622 # endif OBJ 623 # ifdef PC 624 putop( P2CALL , P2INT ); 625 putdot( filename , line ); 626 # endif PC 627 } 628