| 1 | #include "defs" |
| 2 | |
| 3 | /* Logical IF codes |
| 4 | */ |
| 5 | |
| 6 | |
| 7 | exif(p) |
| 8 | expptr p; |
| 9 | { |
| 10 | pushctl(CTLIF); |
| 11 | ctlstack->elselabel = newlabel(); |
| 12 | putif(p, ctlstack->elselabel); |
| 13 | } |
| 14 | |
| 15 | |
| 16 | |
| 17 | exelif(p) |
| 18 | expptr p; |
| 19 | { |
| 20 | if(ctlstack->ctltype == CTLIF) |
| 21 | { |
| 22 | if(ctlstack->endlabel == 0) |
| 23 | ctlstack->endlabel = newlabel(); |
| 24 | putgoto(ctlstack->endlabel); |
| 25 | putlabel(ctlstack->elselabel); |
| 26 | ctlstack->elselabel = newlabel(); |
| 27 | putif(p, ctlstack->elselabel); |
| 28 | } |
| 29 | |
| 30 | else execerr("elseif out of place", 0); |
| 31 | } |
| 32 | |
| 33 | |
| 34 | |
| 35 | |
| 36 | |
| 37 | exelse() |
| 38 | { |
| 39 | if(ctlstack->ctltype==CTLIF) |
| 40 | { |
| 41 | if(ctlstack->endlabel == 0) |
| 42 | ctlstack->endlabel = newlabel(); |
| 43 | putgoto( ctlstack->endlabel ); |
| 44 | putlabel(ctlstack->elselabel); |
| 45 | ctlstack->ctltype = CTLELSE; |
| 46 | } |
| 47 | |
| 48 | else execerr("else out of place", 0); |
| 49 | } |
| 50 | |
| 51 | |
| 52 | exendif() |
| 53 | { |
| 54 | if(ctlstack->ctltype == CTLIF) |
| 55 | { |
| 56 | putlabel(ctlstack->elselabel); |
| 57 | if(ctlstack->endlabel) |
| 58 | putlabel(ctlstack->endlabel); |
| 59 | popctl(); |
| 60 | } |
| 61 | else if(ctlstack->ctltype == CTLELSE) |
| 62 | { |
| 63 | putlabel(ctlstack->endlabel); |
| 64 | popctl(); |
| 65 | } |
| 66 | |
| 67 | else execerr("endif out of place", 0); |
| 68 | } |
| 69 | |
| 70 | |
| 71 | |
| 72 | LOCAL pushctl(code) |
| 73 | int code; |
| 74 | { |
| 75 | register int i; |
| 76 | |
| 77 | if(++ctlstack >= lastctl) |
| 78 | fatal("nesting too deep"); |
| 79 | ctlstack->ctltype = code; |
| 80 | for(i = 0 ; i < 4 ; ++i) |
| 81 | ctlstack->ctlabels[i] = 0; |
| 82 | ++blklevel; |
| 83 | } |
| 84 | |
| 85 | |
| 86 | LOCAL popctl() |
| 87 | { |
| 88 | if( ctlstack-- < ctls ) |
| 89 | fatal("control stack empty"); |
| 90 | --blklevel; |
| 91 | poplab(); |
| 92 | } |
| 93 | |
| 94 | |
| 95 | |
| 96 | LOCAL poplab() |
| 97 | { |
| 98 | register struct labelblock *lp; |
| 99 | |
| 100 | for(lp = labeltab ; lp < highlabtab ; ++lp) |
| 101 | if(lp->labdefined) |
| 102 | { |
| 103 | /* mark all labels in inner blocks unreachable */ |
| 104 | if(lp->blklevel > blklevel) |
| 105 | lp->labinacc = YES; |
| 106 | } |
| 107 | else if(lp->blklevel > blklevel) |
| 108 | { |
| 109 | /* move all labels referred to in inner blocks out a level */ |
| 110 | lp->blklevel = blklevel; |
| 111 | } |
| 112 | } |
| 113 | \f |
| 114 | |
| 115 | |
| 116 | /* BRANCHING CODE |
| 117 | */ |
| 118 | |
| 119 | exgoto(lab) |
| 120 | struct labelblock *lab; |
| 121 | { |
| 122 | putgoto(lab->labelno); |
| 123 | } |
| 124 | |
| 125 | |
| 126 | |
| 127 | |
| 128 | |
| 129 | |
| 130 | |
| 131 | exequals(lp, rp) |
| 132 | register struct primblock *lp; |
| 133 | register expptr rp; |
| 134 | { |
| 135 | if(lp->tag != TPRIM) |
| 136 | { |
| 137 | err("assignment to a non-variable"); |
| 138 | frexpr(lp); |
| 139 | frexpr(rp); |
| 140 | } |
| 141 | else if(lp->namep->vclass!=CLVAR && lp->argsp) |
| 142 | { |
| 143 | if(parstate >= INEXEC) |
| 144 | err("statement function amid executables"); |
| 145 | else |
| 146 | mkstfunct(lp, rp); |
| 147 | } |
| 148 | else |
| 149 | { |
| 150 | if(parstate < INDATA) |
| 151 | enddcl(); |
| 152 | puteq(mklhs(lp), rp); |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | |
| 157 | |
| 158 | mkstfunct(lp, rp) |
| 159 | struct primblock *lp; |
| 160 | expptr rp; |
| 161 | { |
| 162 | register struct primblock *p; |
| 163 | register struct nameblock *np; |
| 164 | chainp args; |
| 165 | |
| 166 | np = lp->namep; |
| 167 | if(np->vclass == CLUNKNOWN) |
| 168 | np->vclass = CLPROC; |
| 169 | else |
| 170 | { |
| 171 | dclerr("redeclaration of statement function", np); |
| 172 | return; |
| 173 | } |
| 174 | np->vprocclass = PSTFUNCT; |
| 175 | np->vstg = STGSTFUNCT; |
| 176 | impldcl(np); |
| 177 | args = (lp->argsp ? lp->argsp->listp : NULL); |
| 178 | np->vardesc.vstfdesc = mkchain(args , rp ); |
| 179 | |
| 180 | for( ; args ; args = args->nextp) |
| 181 | if( (p = args->datap)->tag!=TPRIM || |
| 182 | p->argsp || p->fcharp || p->lcharp) |
| 183 | err("non-variable argument in statement function definition"); |
| 184 | else |
| 185 | { |
| 186 | vardcl(args->datap = p->namep); |
| 187 | free(p); |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | |
| 192 | |
| 193 | excall(name, args, nstars, labels) |
| 194 | struct hashentry *name; |
| 195 | struct listblock *args; |
| 196 | int nstars; |
| 197 | struct labelblock *labels[ ]; |
| 198 | { |
| 199 | register expptr p; |
| 200 | |
| 201 | settype(name, TYSUBR, NULL); |
| 202 | p = mkfunct( mkprim(name, args, NULL, NULL) ); |
| 203 | p->vtype = p->leftp->vtype = TYINT; |
| 204 | if(nstars > 0) |
| 205 | putcmgo(p, nstars, labels); |
| 206 | else putexpr(p); |
| 207 | } |
| 208 | |
| 209 | |
| 210 | |
| 211 | exstop(stop, p) |
| 212 | int stop; |
| 213 | register expptr p; |
| 214 | { |
| 215 | char *q; |
| 216 | int n; |
| 217 | struct constblock *mkstrcon(); |
| 218 | |
| 219 | if(p) |
| 220 | { |
| 221 | if( ! ISCONST(p) ) |
| 222 | { |
| 223 | execerr("pause/stop argument must be constant", 0); |
| 224 | frexpr(p); |
| 225 | p = mkstrcon(0, 0); |
| 226 | } |
| 227 | else if( ISINT(p->vtype) ) |
| 228 | { |
| 229 | q = convic(p->const.ci); |
| 230 | n = strlen(q); |
| 231 | if(n > 0) |
| 232 | { |
| 233 | p->const.ccp = copyn(n, q); |
| 234 | p->vtype = TYCHAR; |
| 235 | p->vleng = ICON(n); |
| 236 | } |
| 237 | else |
| 238 | p = mkstrcon(0, 0); |
| 239 | } |
| 240 | else if(p->vtype != TYCHAR) |
| 241 | { |
| 242 | execerr("pause/stop argument must be integer or string", 0); |
| 243 | p = mkstrcon(0, 0); |
| 244 | } |
| 245 | } |
| 246 | else p = mkstrcon(0, 0); |
| 247 | |
| 248 | putexpr( call1(TYSUBR, (stop ? "s_stop" : "s_paus"), p) ); |
| 249 | } |
| 250 | \f |
| 251 | /* DO LOOP CODE */ |
| 252 | |
| 253 | #define DOINIT par[0] |
| 254 | #define DOLIMIT par[1] |
| 255 | #define DOINCR par[2] |
| 256 | |
| 257 | #define VARSTEP 0 |
| 258 | #define POSSTEP 1 |
| 259 | #define NEGSTEP 2 |
| 260 | |
| 261 | |
| 262 | exdo(range, spec) |
| 263 | int range; |
| 264 | chainp spec; |
| 265 | { |
| 266 | register expptr p, q; |
| 267 | expptr *q1; |
| 268 | register struct nameblock *np; |
| 269 | chainp cp; |
| 270 | register int i; |
| 271 | int dotype, incsign; |
| 272 | struct addrblock *dovarp, *dostgp; |
| 273 | expptr par[3]; |
| 274 | |
| 275 | pushctl(CTLDO); |
| 276 | dorange = ctlstack->dolabel = range; |
| 277 | np = spec->datap; |
| 278 | ctlstack->donamep = NULL; |
| 279 | if(np->vdovar) |
| 280 | { |
| 281 | err1("nested loops with variable %s", varstr(VL,np->varname)); |
| 282 | ctlstack->donamep = NULL; |
| 283 | return; |
| 284 | } |
| 285 | |
| 286 | dovarp = mklhs( mkprim(np, 0,0,0) ); |
| 287 | if( ! ONEOF(dovarp->vtype, MSKINT|MSKREAL) ) |
| 288 | { |
| 289 | err("bad type on do variable"); |
| 290 | return; |
| 291 | } |
| 292 | ctlstack->donamep = np; |
| 293 | |
| 294 | np->vdovar = YES; |
| 295 | if( enregister(np) ) |
| 296 | { |
| 297 | /* stgp points to a storage version, varp to a register version */ |
| 298 | dostgp = dovarp; |
| 299 | dovarp = mklhs( mkprim(np, 0,0,0) ); |
| 300 | } |
| 301 | else |
| 302 | dostgp = NULL; |
| 303 | dotype = dovarp->vtype; |
| 304 | |
| 305 | for(i=0 , cp = spec->nextp ; cp!=NULL && i<3 ; cp = cp->nextp) |
| 306 | { |
| 307 | p = par[i++] = fixtype(cp->datap); |
| 308 | if( ! ONEOF(p->vtype, MSKINT|MSKREAL) ) |
| 309 | { |
| 310 | err("bad type on DO parameter"); |
| 311 | return; |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | frchain(&spec); |
| 316 | switch(i) |
| 317 | { |
| 318 | case 0: |
| 319 | case 1: |
| 320 | err("too few DO parameters"); |
| 321 | return; |
| 322 | |
| 323 | default: |
| 324 | err("too many DO parameters"); |
| 325 | return; |
| 326 | |
| 327 | case 2: |
| 328 | DOINCR = ICON(1); |
| 329 | |
| 330 | case 3: |
| 331 | break; |
| 332 | } |
| 333 | |
| 334 | ctlstack->endlabel = newlabel(); |
| 335 | ctlstack->dobodylabel = newlabel(); |
| 336 | |
| 337 | if( ISCONST(DOLIMIT) ) |
| 338 | ctlstack->domax = mkconv(dotype, DOLIMIT); |
| 339 | else |
| 340 | ctlstack->domax = mktemp(dotype, NULL); |
| 341 | |
| 342 | if( ISCONST(DOINCR) ) |
| 343 | { |
| 344 | ctlstack->dostep = mkconv(dotype, DOINCR); |
| 345 | if( (incsign = conssgn(ctlstack->dostep)) == 0) |
| 346 | err("zero DO increment"); |
| 347 | ctlstack->dostepsign = (incsign > 0 ? POSSTEP : NEGSTEP); |
| 348 | } |
| 349 | else |
| 350 | { |
| 351 | ctlstack->dostep = mktemp(dotype, NULL); |
| 352 | ctlstack->dostepsign = VARSTEP; |
| 353 | ctlstack->doposlabel = newlabel(); |
| 354 | ctlstack->doneglabel = newlabel(); |
| 355 | } |
| 356 | |
| 357 | if( ISCONST(ctlstack->domax) && ISCONST(DOINIT) && ctlstack->dostepsign!=VARSTEP) |
| 358 | { |
| 359 | puteq(cpexpr(dovarp), cpexpr(DOINIT)); |
| 360 | if( onetripflag ) |
| 361 | frexpr(DOINIT); |
| 362 | else |
| 363 | { |
| 364 | q = mkexpr(OPPLUS, ICON(1), |
| 365 | mkexpr(OPMINUS, cpexpr(ctlstack->domax), cpexpr(DOINIT)) ); |
| 366 | if(incsign != conssgn(q)) |
| 367 | { |
| 368 | warn("DO range never executed"); |
| 369 | putgoto(ctlstack->endlabel); |
| 370 | } |
| 371 | frexpr(q); |
| 372 | } |
| 373 | } |
| 374 | else if(ctlstack->dostepsign!=VARSTEP && !onetripflag) |
| 375 | { |
| 376 | if( ISCONST(ctlstack->domax) ) |
| 377 | q = cpexpr(ctlstack->domax); |
| 378 | else |
| 379 | q = mkexpr(OPASSIGN, cpexpr(ctlstack->domax), DOLIMIT); |
| 380 | |
| 381 | q1 = mkexpr(OPASSIGN, cpexpr(dovarp), DOINIT); |
| 382 | q = mkexpr( (ctlstack->dostepsign==POSSTEP ? OPLE : OPGE), q1, q); |
| 383 | putif(q, ctlstack->endlabel); |
| 384 | } |
| 385 | else |
| 386 | { |
| 387 | if(! ISCONST(ctlstack->domax) ) |
| 388 | puteq( cpexpr(ctlstack->domax), DOLIMIT); |
| 389 | q = DOINIT; |
| 390 | if( ! onetripflag ) |
| 391 | q = mkexpr(OPMINUS, q, |
| 392 | mkexpr(OPASSIGN, cpexpr(ctlstack->dostep), DOINCR) ); |
| 393 | puteq( cpexpr(dovarp), q); |
| 394 | if(onetripflag && ctlstack->dostepsign==VARSTEP) |
| 395 | puteq( cpexpr(ctlstack->dostep), DOINCR); |
| 396 | } |
| 397 | |
| 398 | if(ctlstack->dostepsign == VARSTEP) |
| 399 | { |
| 400 | if(onetripflag) |
| 401 | putgoto(ctlstack->dobodylabel); |
| 402 | else |
| 403 | putif( mkexpr(OPGE, cpexpr(ctlstack->dostep), ICON(0)), |
| 404 | ctlstack->doneglabel ); |
| 405 | putlabel(ctlstack->doposlabel); |
| 406 | putif( mkexpr(OPLE, |
| 407 | mkexpr(OPPLUSEQ, cpexpr(dovarp), cpexpr(ctlstack->dostep)), |
| 408 | cpexpr(ctlstack->domax) ), |
| 409 | ctlstack->endlabel); |
| 410 | } |
| 411 | putlabel(ctlstack->dobodylabel); |
| 412 | if(dostgp) |
| 413 | puteq(dostgp, cpexpr(dovarp)); |
| 414 | frexpr(dovarp); |
| 415 | } |
| 416 | |
| 417 | |
| 418 | |
| 419 | enddo(here) |
| 420 | int here; |
| 421 | { |
| 422 | register struct ctlframe *q; |
| 423 | register expptr t; |
| 424 | struct nameblock *np; |
| 425 | struct addrblock *ap; |
| 426 | register int i; |
| 427 | |
| 428 | while(here == dorange) |
| 429 | { |
| 430 | if(np = ctlstack->donamep) |
| 431 | { |
| 432 | t = mkexpr(OPPLUSEQ, mklhs(mkprim(ctlstack->donamep, 0,0,0)), |
| 433 | cpexpr(ctlstack->dostep) ); |
| 434 | |
| 435 | if(ctlstack->dostepsign == VARSTEP) |
| 436 | { |
| 437 | putif( mkexpr(OPLE, cpexpr(ctlstack->dostep), ICON(0)), ctlstack->doposlabel); |
| 438 | putlabel(ctlstack->doneglabel); |
| 439 | putif( mkexpr(OPLT, t, ctlstack->domax), ctlstack->dobodylabel); |
| 440 | } |
| 441 | else |
| 442 | putif( mkexpr( (ctlstack->dostepsign==POSSTEP ? OPGT : OPLT), |
| 443 | t, ctlstack->domax), |
| 444 | ctlstack->dobodylabel); |
| 445 | putlabel(ctlstack->endlabel); |
| 446 | if(ap = memversion(np)) |
| 447 | puteq(ap, mklhs( mkprim(np,0,0,0)) ); |
| 448 | for(i = 0 ; i < 4 ; ++i) |
| 449 | ctlstack->ctlabels[i] = 0; |
| 450 | deregister(ctlstack->donamep); |
| 451 | ctlstack->donamep->vdovar = NO; |
| 452 | frexpr(ctlstack->dostep); |
| 453 | } |
| 454 | |
| 455 | popctl(); |
| 456 | dorange = 0; |
| 457 | for(q = ctlstack ; q>=ctls ; --q) |
| 458 | if(q->ctltype == CTLDO) |
| 459 | { |
| 460 | dorange = q->dolabel; |
| 461 | break; |
| 462 | } |
| 463 | } |
| 464 | } |
| 465 | \f |
| 466 | exassign(vname, labelval) |
| 467 | struct nameblock *vname; |
| 468 | struct labelblock *labelval; |
| 469 | { |
| 470 | struct addrblock *p; |
| 471 | struct constblock *mkaddcon(); |
| 472 | |
| 473 | p = mklhs(mkprim(vname,0,0,0)); |
| 474 | if( ! ONEOF(p->vtype, MSKINT|MSKADDR) ) |
| 475 | err("noninteger assign variable"); |
| 476 | else |
| 477 | puteq(p, mkaddcon(labelval->labelno) ); |
| 478 | } |
| 479 | |
| 480 | |
| 481 | |
| 482 | exarif(expr, neglab, zerlab, poslab) |
| 483 | expptr expr; |
| 484 | struct labelblock *neglab, *zerlab, *poslab; |
| 485 | { |
| 486 | register int lm, lz, lp; |
| 487 | |
| 488 | lm = neglab->labelno; |
| 489 | lz = zerlab->labelno; |
| 490 | lp = poslab->labelno; |
| 491 | expr = fixtype(expr); |
| 492 | |
| 493 | if( ! ONEOF(expr->vtype, MSKINT|MSKREAL) ) |
| 494 | { |
| 495 | err("invalid type of arithmetic if expression"); |
| 496 | frexpr(expr); |
| 497 | } |
| 498 | else |
| 499 | { |
| 500 | if(lm == lz) |
| 501 | exar2(OPLE, expr, lm, lp); |
| 502 | else if(lm == lp) |
| 503 | exar2(OPNE, expr, lm, lz); |
| 504 | else if(lz == lp) |
| 505 | exar2(OPGE, expr, lz, lm); |
| 506 | else |
| 507 | prarif(expr, lm, lz, lp); |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | |
| 512 | |
| 513 | LOCAL exar2(op, e, l1, l2) |
| 514 | int op; |
| 515 | expptr e; |
| 516 | int l1, l2; |
| 517 | { |
| 518 | putif( mkexpr(op, e, ICON(0)), l2); |
| 519 | putgoto(l1); |
| 520 | } |
| 521 | |
| 522 | |
| 523 | exreturn(p) |
| 524 | register expptr p; |
| 525 | { |
| 526 | if(p && (proctype!=TYSUBR || procclass!=CLPROC) ) |
| 527 | { |
| 528 | err("alternate return in nonsubroutine"); |
| 529 | p = 0; |
| 530 | } |
| 531 | |
| 532 | if(p) |
| 533 | { |
| 534 | putforce(TYINT, p); |
| 535 | putgoto(retlabel); |
| 536 | } |
| 537 | else |
| 538 | putgoto(procclass==TYSUBR ? ret0label : retlabel); |
| 539 | } |
| 540 | |
| 541 | |
| 542 | |
| 543 | exasgoto(labvar) |
| 544 | struct hashentry *labvar; |
| 545 | { |
| 546 | register struct addrblock *p; |
| 547 | |
| 548 | p = mklhs( mkprim(labvar,0,0,0) ); |
| 549 | if( ! ISINT(p->vtype) ) |
| 550 | err("assigned goto variable must be integer"); |
| 551 | else |
| 552 | putbranch(p); |
| 553 | } |