1 /* Copyright (c) 1979 Regents of the University of California */ 2 3 static char sccsid[] = "@(#)stat.c 1.2 01/16/81"; 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 long soffset; 39 40 s = r; 41 snlp = nlp; 42 soffset = sizes[ cbn ].om_off; 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 if ( soffset != sizes[ cbn ].om_off ) { 139 sizes[ cbn ].om_off = soffset; 140 # ifdef PC 141 putlbracket( ftnno , -sizes[cbn].om_off ); 142 # endif PC 143 } 144 } 145 146 ungoto() 147 { 148 register struct nl *p; 149 150 for (p = gotos[cbn]; p != NIL; p = p->chain) 151 if ((p->nl_flags & NFORWD) != 0) { 152 if (p->value[NL_GOLEV] != NOTYET) 153 if (p->value[NL_GOLEV] > level) 154 p->value[NL_GOLEV] = level; 155 } else 156 if (p->value[NL_GOLEV] != DEAD) 157 if (p->value[NL_GOLEV] > level) 158 p->value[NL_GOLEV] = DEAD; 159 } 160 161 putcnt() 162 { 163 164 if (monflg == 0) { 165 return; 166 } 167 inccnt( getcnt() ); 168 } 169 170 int 171 getcnt() 172 { 173 174 return ++cnts; 175 } 176 177 inccnt( counter ) 178 int counter; 179 { 180 181 # ifdef OBJ 182 put2(O_COUNT, counter ); 183 # endif OBJ 184 # ifdef PC 185 putRV( PCPCOUNT , 0 , counter * sizeof (long) , P2INT ); 186 putleaf( P2ICON , 1 , 0 , P2INT , 0 ); 187 putop( P2ASG P2PLUS , P2INT ); 188 putdot( filename , line ); 189 # endif PC 190 } 191 192 putline() 193 { 194 195 # ifdef OBJ 196 if (opt('p') != 0) 197 put2(O_LINO, line); 198 # endif OBJ 199 # ifdef PC 200 static lastline; 201 202 if ( line != lastline ) { 203 stabline( line ); 204 lastline = line; 205 } 206 if ( opt( 'p' ) ) { 207 if ( opt('t') ) { 208 putleaf( P2ICON , 0 , 0 , ADDTYPE( P2FTN | P2INT , P2PTR ) 209 , "_LINO" ); 210 putop( P2UNARY P2CALL , P2INT ); 211 putdot( filename , line ); 212 } else { 213 putRV( STMTCOUNT , 0 , 0 , P2INT ); 214 putleaf( P2ICON , 1 , 0 , P2INT , 0 ); 215 putop( P2ASG P2PLUS , P2INT ); 216 putdot( filename , line ); 217 } 218 } 219 # endif PC 220 } 221 222 /* 223 * With varlist do stat 224 * 225 * With statement requires an extra word 226 * in automatic storage for each level of withing. 227 * These indirect pointers are initialized here, and 228 * the scoping effect of the with statement occurs 229 * because lookup examines the field names of the records 230 * associated with the WITHPTRs on the withlist. 231 */ 232 withop(s) 233 int *s; 234 { 235 register *p; 236 register struct nl *r; 237 int i; 238 int *swl; 239 long soffset; 240 241 putline(); 242 swl = withlist; 243 soffset = sizes[cbn].om_off; 244 for (p = s[2]; p != NIL; p = p[2]) { 245 i = sizes[cbn].om_off -= sizeof ( int * ); 246 if (sizes[cbn].om_off < sizes[cbn].om_max) 247 sizes[cbn].om_max = sizes[cbn].om_off; 248 # ifdef OBJ 249 put2(O_LV | cbn <<8+INDX, i ); 250 # endif OBJ 251 # ifdef PC 252 putlbracket( ftnno , -sizes[cbn].om_off ); 253 putRV( 0 , cbn , i , P2PTR|P2STRTY ); 254 # endif PC 255 r = lvalue(p[1], MOD , LREQ ); 256 if (r == NIL) 257 continue; 258 if (r->class != RECORD) { 259 error("Variable in with statement refers to %s, not to a record", nameof(r)); 260 continue; 261 } 262 r = defnl(0, WITHPTR, r, i); 263 r->nl_next = withlist; 264 withlist = r; 265 # ifdef OBJ 266 put(1, PTR_AS); 267 # endif OBJ 268 # ifdef PC 269 putop( P2ASSIGN , P2PTR|P2STRTY ); 270 putdot( filename , line ); 271 # endif PC 272 } 273 statement(s[3]); 274 sizes[cbn].om_off = soffset; 275 # ifdef PC 276 putlbracket( ftnno , -sizes[cbn].om_off ); 277 # endif PC 278 withlist = swl; 279 } 280 281 extern flagwas; 282 /* 283 * var := expr 284 */ 285 asgnop(r) 286 int *r; 287 { 288 register struct nl *p; 289 register *av; 290 291 if (r == NIL) 292 return (NIL); 293 /* 294 * Asgnop's only function is 295 * to handle function variable 296 * assignments. All other assignment 297 * stuff is handled by asgnop1. 298 * the if below checks for unqualified lefthandside: 299 * necessary for fvars. 300 */ 301 av = r[2]; 302 if (av != NIL && av[0] == T_VAR && av[3] == NIL) { 303 p = lookup1(av[2]); 304 if (p != NIL) 305 p->nl_flags = flagwas; 306 if (p != NIL && p->class == FVAR) { 307 /* 308 * Give asgnop1 the func 309 * which is the chain of 310 * the FVAR. 311 */ 312 p->nl_flags |= NUSED|NMOD; 313 p = p->chain; 314 if (p == NIL) { 315 rvalue(r[3], NIL , RREQ ); 316 return; 317 } 318 # ifdef OBJ 319 put2(O_LV | bn << 8+INDX, p->value[NL_OFFS]); 320 if (isa(p->type, "i") && width(p->type) == 1) 321 asgnop1(r, nl+T2INT); 322 else 323 asgnop1(r, p->type); 324 # endif OBJ 325 # ifdef PC 326 /* 327 * this should be the lvalue of the fvar, 328 * but since the second pass knows to use 329 * the address of the left operand of an 330 * assignment, what i want here is an rvalue. 331 * see note in funchdr about fvar allocation. 332 */ 333 p = p -> ptr[ NL_FVAR ]; 334 putRV( p -> symbol , bn , p -> value[ NL_OFFS ] 335 , p2type( p -> type ) ); 336 asgnop1( r , p -> type ); 337 # endif PC 338 return; 339 } 340 } 341 asgnop1(r, NIL); 342 } 343 344 /* 345 * Asgnop1 handles all assignments. 346 * If p is not nil then we are assigning 347 * to a function variable, otherwise 348 * we look the variable up ourselves. 349 */ 350 struct nl * 351 asgnop1(r, p) 352 int *r; 353 register struct nl *p; 354 { 355 register struct nl *p1; 356 357 if (r == NIL) 358 return (NIL); 359 if (p == NIL) { 360 # ifdef OBJ 361 p = lvalue(r[2], MOD|ASGN|NOUSE , LREQ ); 362 # endif OBJ 363 # ifdef PC 364 /* 365 * since the second pass knows that it should reference 366 * the lefthandside of asignments, what i need here is 367 * an rvalue. 368 */ 369 p = lvalue( r[2] , MOD|ASGN|NOUSE , RREQ ); 370 # endif PC 371 if ( p == NIL ) { 372 rvalue( r[3] , NIL , RREQ ); 373 return NIL; 374 } 375 } 376 # ifdef OBJ 377 p1 = rvalue(r[3], p , RREQ ); 378 # endif OBJ 379 # ifdef PC 380 /* 381 * if this is a scalar assignment, 382 * then i want to rvalue the righthandside. 383 * if this is a structure assignment, 384 * then i want an lvalue to the righthandside. 385 * that's what the intermediate form sez. 386 */ 387 switch ( classify( p ) ) { 388 case TINT: 389 case TCHAR: 390 case TBOOL: 391 case TSCAL: 392 precheck( p , "_RANG4" , "_RSNG4" ); 393 case TDOUBLE: 394 case TPTR: 395 p1 = rvalue( r[3] , p , RREQ ); 396 break; 397 default: 398 p1 = rvalue( r[3] , p , LREQ ); 399 break; 400 } 401 # endif PC 402 if (p1 == NIL) 403 return (NIL); 404 if (incompat(p1, p, r[3])) { 405 cerror("Type of expression clashed with type of variable in assignment"); 406 return (NIL); 407 } 408 switch (classify(p)) { 409 case TINT: 410 case TBOOL: 411 case TCHAR: 412 case TSCAL: 413 # ifdef OBJ 414 rangechk(p, p1); 415 # endif OBJ 416 # ifdef PC 417 postcheck( p ); 418 # endif PC 419 case TDOUBLE: 420 case TPTR: 421 # ifdef OBJ 422 gen(O_AS2, O_AS2, width(p), width(p1)); 423 # endif OBJ 424 # ifdef PC 425 putop( P2ASSIGN , p2type( p ) ); 426 putdot( filename , line ); 427 # endif PC 428 break; 429 default: 430 # ifdef OBJ 431 put2(O_AS, width(p)); 432 # endif OBJ 433 # ifdef PC 434 putstrop( P2STASG , p2type( p ) 435 , lwidth( p ) , align( p ) ); 436 putdot( filename , line ); 437 # endif PC 438 } 439 return (p); /* Used by for statement */ 440 } 441 442 /* 443 * if expr then stat [ else stat ] 444 */ 445 ifop(r) 446 int *r; 447 { 448 register struct nl *p; 449 register l1, l2; /* l1 is start of else, l2 is end of else */ 450 int nr, goc; 451 452 goc = gocnt; 453 if (r == NIL) 454 return; 455 putline(); 456 p = rvalue(r[2], NIL , RREQ ); 457 if (p == NIL) { 458 statement(r[3]); 459 noreach = 0; 460 statement(r[4]); 461 noreach = 0; 462 return; 463 } 464 if (isnta(p, "b")) { 465 error("Type of expression in if statement must be Boolean, not %s", nameof(p)); 466 statement(r[3]); 467 noreach = 0; 468 statement(r[4]); 469 noreach = 0; 470 return; 471 } 472 # ifdef OBJ 473 l1 = put2(O_IF, getlab()); 474 # endif OBJ 475 # ifdef PC 476 l1 = getlab(); 477 putleaf( P2ICON , l1 , 0 , P2INT , 0 ); 478 putop( P2CBRANCH , P2INT ); 479 putdot( filename , line ); 480 # endif PC 481 putcnt(); 482 statement(r[3]); 483 nr = noreach; 484 if (r[4] != NIL) { 485 /* 486 * else stat 487 */ 488 --level; 489 ungoto(); 490 ++level; 491 # ifdef OBJ 492 l2 = put2(O_TRA, getlab()); 493 # endif OBJ 494 # ifdef PC 495 l2 = getlab(); 496 putjbr( l2 ); 497 # endif PC 498 patch(l1); 499 noreach = 0; 500 statement(r[4]); 501 noreach &= nr; 502 l1 = l2; 503 } else 504 noreach = 0; 505 patch(l1); 506 if (goc != gocnt) 507 putcnt(); 508 } 509 510 /* 511 * while expr do stat 512 */ 513 whilop(r) 514 int *r; 515 { 516 register struct nl *p; 517 register l1, l2; 518 int goc; 519 520 goc = gocnt; 521 if (r == NIL) 522 return; 523 putlab(l1 = getlab()); 524 putline(); 525 p = rvalue(r[2], NIL , RREQ ); 526 if (p == NIL) { 527 statement(r[3]); 528 noreach = 0; 529 return; 530 } 531 if (isnta(p, "b")) { 532 error("Type of expression in while statement must be Boolean, not %s", nameof(p)); 533 statement(r[3]); 534 noreach = 0; 535 return; 536 } 537 l2 = getlab(); 538 # ifdef OBJ 539 put2(O_IF, l2); 540 # endif OBJ 541 # ifdef PC 542 putleaf( P2ICON , l2 , 0 , P2INT , 0 ); 543 putop( P2CBRANCH , P2INT ); 544 putdot( filename , line ); 545 # endif PC 546 putcnt(); 547 statement(r[3]); 548 # ifdef OBJ 549 put2(O_TRA, l1); 550 # endif OBJ 551 # ifdef PC 552 putjbr( l1 ); 553 # endif PC 554 patch(l2); 555 if (goc != gocnt) 556 putcnt(); 557 } 558 559 /* 560 * repeat stat* until expr 561 */ 562 repop(r) 563 int *r; 564 { 565 register struct nl *p; 566 register l; 567 int goc; 568 569 goc = gocnt; 570 if (r == NIL) 571 return; 572 l = putlab(getlab()); 573 putcnt(); 574 statlist(r[2]); 575 line = r[1]; 576 p = rvalue(r[3], NIL , RREQ ); 577 if (p == NIL) 578 return; 579 if (isnta(p,"b")) { 580 error("Until expression type must be Boolean, not %s, in repeat statement", nameof(p)); 581 return; 582 } 583 # ifdef OBJ 584 put2(O_IF, l); 585 # endif OBJ 586 # ifdef PC 587 putleaf( P2ICON , l , 0 , P2INT , 0 ); 588 putop( P2CBRANCH , P2INT ); 589 putdot( filename , line ); 590 # endif PC 591 if (goc != gocnt) 592 putcnt(); 593 } 594 595 /* 596 * assert expr 597 */ 598 asrtop(r) 599 register int *r; 600 { 601 register struct nl *q; 602 603 if (opt('s')) { 604 standard(); 605 error("Assert statement is non-standard"); 606 } 607 if (!opt('t')) 608 return; 609 r = r[2]; 610 # ifdef OBJ 611 q = rvalue((int *) r, NLNIL , RREQ ); 612 # endif OBJ 613 # ifdef PC 614 putleaf( P2ICON , 0 , 0 615 , ADDTYPE( P2FTN | P2INT , P2PTR ) , "_ASRT" ); 616 q = stkrval( r , NLNIL , RREQ ); 617 # endif PC 618 if (q == NIL) 619 return; 620 if (isnta(q, "b")) 621 error("Assert expression must be Boolean, not %ss", nameof(q)); 622 # ifdef OBJ 623 put1(O_ASRT); 624 # endif OBJ 625 # ifdef PC 626 putop( P2CALL , P2INT ); 627 putdot( filename , line ); 628 # endif PC 629 } 630