1 /* 2 * Copyright (c) 1980 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[] = "@(#)expr.c 5.3 (Berkeley) 6/23/85"; 9 #endif not lint 10 11 /* 12 * expr.c 13 * 14 * Routines for handling expressions, f77 compiler pass 1. 15 * 16 * University of Utah CS Dept modification history: 17 * 18 * $Log: expr.c,v $ 19 * Revision 1.3 86/02/26 17:13:37 rcs 20 * Correct COFR 411. 21 * P. Wong 22 * 23 * Revision 3.16 85/06/21 16:38:09 donn 24 * The fix to mkprim() didn't handle null substring parameters (sigh). 25 * 26 * Revision 3.15 85/06/04 04:37:03 donn 27 * Changed mkprim() to force substring parameters to be integral types. 28 * 29 * Revision 3.14 85/06/04 03:41:52 donn 30 * Change impldcl() to handle functions of type 'undefined'. 31 * 32 * Revision 3.13 85/05/06 23:14:55 donn 33 * Changed mkconv() so that it calls mkaltemp() instead of mktemp() to get 34 * a temporary when converting character strings to integers; previously we 35 * were having problems because mkconv() was called after tempalloc(). 36 * 37 * Revision 3.12 85/03/18 08:07:47 donn 38 * Fixes to help out with short integers -- if integers are by default short, 39 * then so are constants; and if addresses can't be stored in shorts, complain. 40 * 41 * Revision 3.11 85/03/16 22:31:27 donn 42 * Added hack to mkconv() to allow character values of length > 1 to be 43 * converted to numeric types, for Helge Skrivervik. Note that this does 44 * not affect use of the intrinsic ichar() conversion. 45 * 46 * Revision 3.10 85/01/15 21:06:47 donn 47 * Changed mkconv() to comment on implicit conversions; added intrconv() for 48 * use with explicit conversions by intrinsic functions. 49 * 50 * Revision 3.9 85/01/11 21:05:49 donn 51 * Added changes to implement SAVE statements. 52 * 53 * Revision 3.8 84/12/17 02:21:06 donn 54 * Added a test to prevent constant folding from being done on expressions 55 * whose type is not known at that point in mkexpr(). 56 * 57 * Revision 3.7 84/12/11 21:14:17 donn 58 * Removed obnoxious 'excess precision' warning. 59 * 60 * Revision 3.6 84/11/23 01:00:36 donn 61 * Added code to trim excess precision from single-precision constants, and 62 * to warn the user when this occurs. 63 * 64 * Revision 3.5 84/11/23 00:10:39 donn 65 * Changed stfcall() to remark on argument type clashes in 'calls' to 66 * statement functions. 67 * 68 * Revision 3.4 84/11/22 21:21:17 donn 69 * Fixed bug in fix to mkexpr() that caused IMPLICIT to affect intrinsics. 70 * 71 * Revision 3.3 84/11/12 18:26:14 donn 72 * Shuffled some code around so that the compiler remembers to free some vleng 73 * structures which used to just sit around. 74 * 75 * Revision 3.2 84/10/16 19:24:15 donn 76 * Fix for Peter Montgomery's bug with -C and invalid subscripts -- prevent 77 * core dumps by replacing bad subscripts with good ones. 78 * 79 * Revision 3.1 84/10/13 01:31:32 donn 80 * Merged Jerry Berkman's version into mine. 81 * 82 * Revision 2.7 84/09/27 15:42:52 donn 83 * The last fix for multiplying undeclared variables by 0 isn't sufficient, 84 * since the type of the 0 may not be the (implicit) type of the variable. 85 * I added a hack to check the implicit type of implicitly declared 86 * variables... 87 * 88 * Revision 2.6 84/09/14 19:34:03 donn 89 * Problem noted by Mike Vevea -- mkexpr will sometimes attempt to convert 90 * 0 to type UNKNOWN, which is illegal. Fix is to use native type instead. 91 * Not sure how correct (or important) this is... 92 * 93 * Revision 2.5 84/08/05 23:05:27 donn 94 * Added fixes to prevent fixexpr() from slicing and dicing complex conversions 95 * with two operands. 96 * 97 * Revision 2.4 84/08/05 17:34:48 donn 98 * Added an optimization to mklhs() to detect substrings of the form ch(i:i) 99 * and assign constant length 1 to them. 100 * 101 * Revision 2.3 84/07/19 19:38:33 donn 102 * Added a typecast to the last fix. Somehow I missed it the first time... 103 * 104 * Revision 2.2 84/07/19 17:19:57 donn 105 * Caused OPPAREN expressions to inherit the length of their operands, so 106 * that parenthesized character expressions work correctly. 107 * 108 * Revision 2.1 84/07/19 12:03:02 donn 109 * Changed comment headers for UofU. 110 * 111 * Revision 1.2 84/04/06 20:12:17 donn 112 * Fixed bug which caused programs with mixed-type multiplications involving 113 * the constant 0 to choke the compiler. 114 * 115 */ 116 117 #include "defs.h" 118 119 120 /* little routines to create constant blocks */ 121 122 Constp mkconst(t) 123 register int t; 124 { 125 register Constp p; 126 127 p = ALLOC(Constblock); 128 p->tag = TCONST; 129 p->vtype = t; 130 return(p); 131 } 132 133 134 expptr mklogcon(l) 135 register int l; 136 { 137 register Constp p; 138 139 p = mkconst(TYLOGICAL); 140 p->const.ci = l; 141 return( (expptr) p ); 142 } 143 144 145 146 expptr mkintcon(l) 147 ftnint l; 148 { 149 register Constp p; 150 int usetype; 151 152 if(tyint == TYSHORT) 153 { 154 short s = l; 155 if(l != s) 156 usetype = TYLONG; 157 else 158 usetype = TYSHORT; 159 } 160 else 161 usetype = tyint; 162 p = mkconst(usetype); 163 p->const.ci = l; 164 return( (expptr) p ); 165 } 166 167 168 169 expptr mkaddcon(l) 170 register int l; 171 { 172 register Constp p; 173 174 p = mkconst(TYADDR); 175 p->const.ci = l; 176 return( (expptr) p ); 177 } 178 179 180 181 expptr mkrealcon(t, d) 182 register int t; 183 double d; 184 { 185 register Constp p; 186 187 p = mkconst(t); 188 p->const.cd[0] = d; 189 return( (expptr) p ); 190 } 191 192 expptr mkbitcon(shift, leng, s) 193 int shift; 194 register int leng; 195 register char *s; 196 { 197 Constp p; 198 register int i, j, k; 199 register char *bp; 200 int size; 201 202 size = (shift*leng + BYTESIZE -1)/BYTESIZE; 203 bp = (char *) ckalloc(size); 204 205 i = 0; 206 207 #if (HERE == PDP11 || HERE == VAX) 208 j = 0; 209 #else 210 j = size; 211 #endif 212 213 k = 0; 214 215 while (leng > 0) 216 { 217 k |= (hextoi(s[--leng]) << i); 218 i += shift; 219 if (i >= BYTESIZE) 220 { 221 #if (HERE == PDP11 || HERE == VAX) 222 bp[j++] = k & MAXBYTE; 223 #else 224 bp[--j] = k & MAXBYTE; 225 #endif 226 k = k >> BYTESIZE; 227 i -= BYTESIZE; 228 } 229 } 230 231 if (k != 0) 232 #if (HERE == PDP11 || HERE == VAX) 233 bp[j++] = k; 234 #else 235 bp[--j] = k; 236 #endif 237 238 p = mkconst(TYBITSTR); 239 p->vleng = ICON(size); 240 p->const.ccp = bp; 241 242 return ((expptr) p); 243 } 244 245 246 247 expptr mkstrcon(l,v) 248 int l; 249 register char *v; 250 { 251 register Constp p; 252 register char *s; 253 254 p = mkconst(TYCHAR); 255 p->vleng = ICON(l); 256 p->const.ccp = s = (char *) ckalloc(l); 257 while(--l >= 0) 258 *s++ = *v++; 259 return( (expptr) p ); 260 } 261 262 263 expptr mkcxcon(realp,imagp) 264 register expptr realp, imagp; 265 { 266 int rtype, itype; 267 register Constp p; 268 269 rtype = realp->headblock.vtype; 270 itype = imagp->headblock.vtype; 271 272 if( ISCONST(realp) && ISNUMERIC(rtype) && ISCONST(imagp) && ISNUMERIC(itype) ) 273 { 274 p = mkconst( (rtype==TYDREAL||itype==TYDREAL) ? TYDCOMPLEX : TYCOMPLEX); 275 if( ISINT(rtype) ) 276 p->const.cd[0] = realp->constblock.const.ci; 277 else p->const.cd[0] = realp->constblock.const.cd[0]; 278 if( ISINT(itype) ) 279 p->const.cd[1] = imagp->constblock.const.ci; 280 else p->const.cd[1] = imagp->constblock.const.cd[0]; 281 } 282 else 283 { 284 err("invalid complex constant"); 285 p = (Constp) errnode(); 286 } 287 288 frexpr(realp); 289 frexpr(imagp); 290 return( (expptr) p ); 291 } 292 293 294 expptr errnode() 295 { 296 struct Errorblock *p; 297 p = ALLOC(Errorblock); 298 p->tag = TERROR; 299 p->vtype = TYERROR; 300 return( (expptr) p ); 301 } 302 303 304 305 306 307 expptr mkconv(t, p) 308 register int t; 309 register expptr p; 310 { 311 register expptr q; 312 Addrp r, s; 313 register int pt; 314 expptr opconv(); 315 316 if(t==TYUNKNOWN || t==TYERROR) 317 badtype("mkconv", t); 318 pt = p->headblock.vtype; 319 if(t == pt) 320 return(p); 321 322 if( pt == TYCHAR && ISNUMERIC(t) ) 323 { 324 warn("implicit conversion of character to numeric type"); 325 326 /* 327 * Ugly kluge to copy character values into numerics. 328 */ 329 s = mkaltemp(t, ENULL); 330 r = (Addrp) cpexpr(s); 331 r->vtype = TYCHAR; 332 r->varleng = typesize[t]; 333 r->vleng = mkintcon(r->varleng); 334 q = mkexpr(OPASSIGN, r, p); 335 q = mkexpr(OPCOMMA, q, s); 336 return(q); 337 } 338 339 #if SZADDR > SZSHORT 340 if( pt == TYADDR && t == TYSHORT) 341 { 342 err("insufficient precision to hold address type"); 343 return( errnode() ); 344 } 345 #endif 346 if( pt == TYADDR && ISNUMERIC(t) ) 347 warn("implicit conversion of address to numeric type"); 348 349 if( ISCONST(p) && pt!=TYADDR) 350 { 351 q = (expptr) mkconst(t); 352 consconv(t, &(q->constblock.const), 353 p->constblock.vtype, &(p->constblock.const) ); 354 frexpr(p); 355 } 356 #if TARGET == PDP11 357 else if(ISINT(t) && pt==TYCHAR) 358 { 359 q = mkexpr(OPBITAND, opconv(p,TYSHORT), ICON(255)); 360 if(t == TYLONG) 361 q = opconv(q, TYLONG); 362 } 363 #endif 364 else 365 q = opconv(p, t); 366 367 if(t == TYCHAR) 368 q->constblock.vleng = ICON(1); 369 return(q); 370 } 371 372 373 374 /* intrinsic conversions */ 375 expptr intrconv(t, p) 376 register int t; 377 register expptr p; 378 { 379 register expptr q; 380 register int pt; 381 expptr opconv(); 382 383 if(t==TYUNKNOWN || t==TYERROR) 384 badtype("intrconv", t); 385 pt = p->headblock.vtype; 386 if(t == pt) 387 return(p); 388 389 else if( ISCONST(p) && pt!=TYADDR) 390 { 391 q = (expptr) mkconst(t); 392 consconv(t, &(q->constblock.const), 393 p->constblock.vtype, &(p->constblock.const) ); 394 frexpr(p); 395 } 396 #if TARGET == PDP11 397 else if(ISINT(t) && pt==TYCHAR) 398 { 399 q = mkexpr(OPBITAND, opconv(p,TYSHORT), ICON(255)); 400 if(t == TYLONG) 401 q = opconv(q, TYLONG); 402 } 403 #endif 404 else 405 q = opconv(p, t); 406 407 if(t == TYCHAR) 408 q->constblock.vleng = ICON(1); 409 return(q); 410 } 411 412 413 414 expptr opconv(p, t) 415 expptr p; 416 int t; 417 { 418 register expptr q; 419 420 q = mkexpr(OPCONV, p, PNULL); 421 q->headblock.vtype = t; 422 return(q); 423 } 424 425 426 427 expptr addrof(p) 428 expptr p; 429 { 430 return( mkexpr(OPADDR, p, PNULL) ); 431 } 432 433 434 435 tagptr cpexpr(p) 436 register tagptr p; 437 { 438 register tagptr e; 439 int tag; 440 register chainp ep, pp; 441 tagptr cpblock(); 442 443 static int blksize[ ] = 444 { 0, 445 sizeof(struct Nameblock), 446 sizeof(struct Constblock), 447 sizeof(struct Exprblock), 448 sizeof(struct Addrblock), 449 sizeof(struct Tempblock), 450 sizeof(struct Primblock), 451 sizeof(struct Listblock), 452 sizeof(struct Errorblock) 453 }; 454 455 if(p == NULL) 456 return(NULL); 457 458 if( (tag = p->tag) == TNAME) 459 return(p); 460 461 e = cpblock( blksize[p->tag] , p); 462 463 switch(tag) 464 { 465 case TCONST: 466 if(e->constblock.vtype == TYCHAR) 467 { 468 e->constblock.const.ccp = 469 copyn(1+strlen(e->constblock.const.ccp), 470 e->constblock.const.ccp); 471 e->constblock.vleng = 472 (expptr) cpexpr(e->constblock.vleng); 473 } 474 case TERROR: 475 break; 476 477 case TEXPR: 478 e->exprblock.leftp = (expptr) cpexpr(p->exprblock.leftp); 479 e->exprblock.rightp = (expptr) cpexpr(p->exprblock.rightp); 480 break; 481 482 case TLIST: 483 if(pp = p->listblock.listp) 484 { 485 ep = e->listblock.listp = 486 mkchain( cpexpr(pp->datap), CHNULL); 487 for(pp = pp->nextp ; pp ; pp = pp->nextp) 488 ep = ep->nextp = 489 mkchain( cpexpr(pp->datap), CHNULL); 490 } 491 break; 492 493 case TADDR: 494 e->addrblock.vleng = (expptr) cpexpr(e->addrblock.vleng); 495 e->addrblock.memoffset = (expptr)cpexpr(e->addrblock.memoffset); 496 e->addrblock.istemp = NO; 497 break; 498 499 case TTEMP: 500 e->tempblock.vleng = (expptr) cpexpr(e->tempblock.vleng); 501 e->tempblock.istemp = NO; 502 break; 503 504 case TPRIM: 505 e->primblock.argsp = (struct Listblock *) 506 cpexpr(e->primblock.argsp); 507 e->primblock.fcharp = (expptr) cpexpr(e->primblock.fcharp); 508 e->primblock.lcharp = (expptr) cpexpr(e->primblock.lcharp); 509 break; 510 511 default: 512 badtag("cpexpr", tag); 513 } 514 515 return(e); 516 } 517 518 frexpr(p) 519 register tagptr p; 520 { 521 register chainp q; 522 523 if(p == NULL) 524 return; 525 526 switch(p->tag) 527 { 528 case TCONST: 529 switch (p->constblock.vtype) 530 { 531 case TYBITSTR: 532 case TYCHAR: 533 case TYHOLLERITH: 534 free( (charptr) (p->constblock.const.ccp) ); 535 frexpr(p->constblock.vleng); 536 } 537 break; 538 539 case TADDR: 540 if (!optimflag && p->addrblock.istemp) 541 { 542 frtemp(p); 543 return; 544 } 545 frexpr(p->addrblock.vleng); 546 frexpr(p->addrblock.memoffset); 547 break; 548 549 case TTEMP: 550 frexpr(p->tempblock.vleng); 551 break; 552 553 case TERROR: 554 break; 555 556 case TNAME: 557 return; 558 559 case TPRIM: 560 frexpr(p->primblock.argsp); 561 frexpr(p->primblock.fcharp); 562 frexpr(p->primblock.lcharp); 563 break; 564 565 case TEXPR: 566 frexpr(p->exprblock.leftp); 567 if(p->exprblock.rightp) 568 frexpr(p->exprblock.rightp); 569 break; 570 571 case TLIST: 572 for(q = p->listblock.listp ; q ; q = q->nextp) 573 frexpr(q->datap); 574 frchain( &(p->listblock.listp) ); 575 break; 576 577 default: 578 badtag("frexpr", p->tag); 579 } 580 581 free( (charptr) p ); 582 } 583 584 /* fix up types in expression; replace subtrees and convert 585 names to address blocks */ 586 587 expptr fixtype(p) 588 register tagptr p; 589 { 590 591 if(p == 0) 592 return(0); 593 594 switch(p->tag) 595 { 596 case TCONST: 597 return( (expptr) p ); 598 599 case TADDR: 600 p->addrblock.memoffset = fixtype(p->addrblock.memoffset); 601 return( (expptr) p); 602 603 case TTEMP: 604 return( (expptr) p); 605 606 case TERROR: 607 return( (expptr) p); 608 609 default: 610 badtag("fixtype", p->tag); 611 612 case TEXPR: 613 return( fixexpr(p) ); 614 615 case TLIST: 616 return( (expptr) p ); 617 618 case TPRIM: 619 if(p->primblock.argsp && p->primblock.namep->vclass!=CLVAR) 620 { 621 if(p->primblock.namep->vtype == TYSUBR) 622 { 623 err("function invocation of subroutine"); 624 return( errnode() ); 625 } 626 else 627 return( mkfunct(p) ); 628 } 629 else return( mklhs(p) ); 630 } 631 } 632 633 634 635 636 637 /* special case tree transformations and cleanups of expression trees */ 638 639 expptr fixexpr(p) 640 register Exprp p; 641 { 642 expptr lp; 643 register expptr rp; 644 register expptr q; 645 int opcode, ltype, rtype, ptype, mtype; 646 expptr lconst, rconst; 647 expptr mkpower(); 648 649 if( ISERROR(p) ) 650 return( (expptr) p ); 651 else if(p->tag != TEXPR) 652 badtag("fixexpr", p->tag); 653 opcode = p->opcode; 654 if (ISCONST(p->leftp)) 655 lconst = (expptr) cpexpr(p->leftp); 656 else 657 lconst = NULL; 658 if (p->rightp && ISCONST(p->rightp)) 659 rconst = (expptr) cpexpr(p->rightp); 660 else 661 rconst = NULL; 662 lp = p->leftp = fixtype(p->leftp); 663 ltype = lp->headblock.vtype; 664 if(opcode==OPASSIGN && lp->tag!=TADDR && lp->tag!=TTEMP) 665 { 666 err("left side of assignment must be variable"); 667 frexpr(p); 668 return( errnode() ); 669 } 670 671 if(p->rightp) 672 { 673 rp = p->rightp = fixtype(p->rightp); 674 rtype = rp->headblock.vtype; 675 } 676 else 677 { 678 rp = NULL; 679 rtype = 0; 680 } 681 682 if(ltype==TYERROR || rtype==TYERROR) 683 { 684 frexpr(p); 685 frexpr(lconst); 686 frexpr(rconst); 687 return( errnode() ); 688 } 689 690 /* force folding if possible */ 691 if( ISCONST(lp) && (rp==NULL || ISCONST(rp)) ) 692 { 693 q = mkexpr(opcode, lp, rp); 694 if( ISCONST(q) ) 695 { 696 frexpr(lconst); 697 frexpr(rconst); 698 return(q); 699 } 700 free( (charptr) q ); /* constants did not fold */ 701 } 702 703 if( (ptype = cktype(opcode, ltype, rtype)) == TYERROR) 704 { 705 frexpr(p); 706 frexpr(lconst); 707 frexpr(rconst); 708 return( errnode() ); 709 } 710 711 switch(opcode) 712 { 713 case OPCONCAT: 714 if(p->vleng == NULL) 715 p->vleng = mkexpr(OPPLUS, 716 cpexpr(lp->headblock.vleng), 717 cpexpr(rp->headblock.vleng) ); 718 break; 719 720 case OPASSIGN: 721 case OPPLUSEQ: 722 case OPSTAREQ: 723 if(ltype == rtype) 724 break; 725 #if TARGET == VAX 726 if( ! rconst && ISREAL(ltype) && ISREAL(rtype) ) 727 break; 728 #endif 729 if( ISCOMPLEX(ltype) || ISCOMPLEX(rtype) ) 730 break; 731 if( ONEOF(ltype, MSKADDR|MSKINT) && ONEOF(rtype, MSKADDR|MSKINT) 732 #if FAMILY==PCC 733 && typesize[ltype]>=typesize[rtype] ) 734 #else 735 && typesize[ltype]==typesize[rtype] ) 736 #endif 737 break; 738 if (rconst) 739 { 740 p->rightp = fixtype( mkconv(ptype, cpexpr(rconst)) ); 741 frexpr(rp); 742 } 743 else 744 p->rightp = fixtype(mkconv(ptype, rp)); 745 break; 746 747 case OPSLASH: 748 if( ISCOMPLEX(rtype) ) 749 { 750 p = (Exprp) call2(ptype, 751 ptype==TYCOMPLEX? "c_div" : "z_div", 752 mkconv(ptype, lp), mkconv(ptype, rp) ); 753 break; 754 } 755 case OPPLUS: 756 case OPMINUS: 757 case OPSTAR: 758 case OPMOD: 759 #if TARGET == VAX 760 if(ptype==TYDREAL && ( (ltype==TYREAL && ! lconst ) || 761 (rtype==TYREAL && ! rconst ) )) 762 break; 763 #endif 764 if( ISCOMPLEX(ptype) ) 765 break; 766 if(ltype != ptype) 767 if (lconst) 768 { 769 p->leftp = fixtype(mkconv(ptype, 770 cpexpr(lconst))); 771 frexpr(lp); 772 } 773 else 774 p->leftp = fixtype(mkconv(ptype,lp)); 775 if(rtype != ptype) 776 if (rconst) 777 { 778 p->rightp = fixtype(mkconv(ptype, 779 cpexpr(rconst))); 780 frexpr(rp); 781 } 782 else 783 p->rightp = fixtype(mkconv(ptype,rp)); 784 break; 785 786 case OPPOWER: 787 return( mkpower(p) ); 788 789 case OPLT: 790 case OPLE: 791 case OPGT: 792 case OPGE: 793 case OPEQ: 794 case OPNE: 795 if(ltype == rtype) 796 break; 797 mtype = cktype(OPMINUS, ltype, rtype); 798 #if TARGET == VAX 799 if(mtype==TYDREAL && ( (ltype==TYREAL && ! lconst) || 800 (rtype==TYREAL && ! rconst) )) 801 break; 802 #endif 803 if( ISCOMPLEX(mtype) ) 804 break; 805 if(ltype != mtype) 806 if (lconst) 807 { 808 p->leftp = fixtype(mkconv(mtype, 809 cpexpr(lconst))); 810 frexpr(lp); 811 } 812 else 813 p->leftp = fixtype(mkconv(mtype,lp)); 814 if(rtype != mtype) 815 if (rconst) 816 { 817 p->rightp = fixtype(mkconv(mtype, 818 cpexpr(rconst))); 819 frexpr(rp); 820 } 821 else 822 p->rightp = fixtype(mkconv(mtype,rp)); 823 break; 824 825 826 case OPCONV: 827 if(ISCOMPLEX(p->vtype)) 828 { 829 ptype = cktype(OPCONV, p->vtype, ltype); 830 if(p->rightp) 831 ptype = cktype(OPCONV, ptype, rtype); 832 break; 833 } 834 ptype = cktype(OPCONV, p->vtype, ltype); 835 if(lp->tag==TEXPR && lp->exprblock.opcode==OPCOMMA) 836 { 837 lp->exprblock.rightp = 838 fixtype( mkconv(ptype, lp->exprblock.rightp) ); 839 free( (charptr) p ); 840 p = (Exprp) lp; 841 } 842 break; 843 844 case OPADDR: 845 if(lp->tag==TEXPR && lp->exprblock.opcode==OPADDR) 846 fatal("addr of addr"); 847 break; 848 849 case OPCOMMA: 850 case OPQUEST: 851 case OPCOLON: 852 break; 853 854 case OPPAREN: 855 p->vleng = (expptr) cpexpr( lp->headblock.vleng ); 856 break; 857 858 case OPMIN: 859 case OPMAX: 860 ptype = p->vtype; 861 break; 862 863 default: 864 break; 865 } 866 867 p->vtype = ptype; 868 frexpr(lconst); 869 frexpr(rconst); 870 return((expptr) p); 871 } 872 873 #if SZINT < SZLONG 874 /* 875 for efficient subscripting, replace long ints by shorts 876 in easy places 877 */ 878 879 expptr shorten(p) 880 register expptr p; 881 { 882 register expptr q; 883 884 if(p->headblock.vtype != TYLONG) 885 return(p); 886 887 switch(p->tag) 888 { 889 case TERROR: 890 case TLIST: 891 return(p); 892 893 case TCONST: 894 case TADDR: 895 return( mkconv(TYINT,p) ); 896 897 case TEXPR: 898 break; 899 900 default: 901 badtag("shorten", p->tag); 902 } 903 904 switch(p->exprblock.opcode) 905 { 906 case OPPLUS: 907 case OPMINUS: 908 case OPSTAR: 909 q = shorten( cpexpr(p->exprblock.rightp) ); 910 if(q->headblock.vtype == TYINT) 911 { 912 p->exprblock.leftp = shorten(p->exprblock.leftp); 913 if(p->exprblock.leftp->headblock.vtype == TYLONG) 914 frexpr(q); 915 else 916 { 917 frexpr(p->exprblock.rightp); 918 p->exprblock.rightp = q; 919 p->exprblock.vtype = TYINT; 920 } 921 } 922 break; 923 924 case OPNEG: 925 case OPPAREN: 926 p->exprblock.leftp = shorten(p->exprblock.leftp); 927 if(p->exprblock.leftp->headblock.vtype == TYINT) 928 p->exprblock.vtype = TYINT; 929 break; 930 931 case OPCALL: 932 case OPCCALL: 933 p = mkconv(TYINT,p); 934 break; 935 default: 936 break; 937 } 938 939 return(p); 940 } 941 #endif 942 /* fix an argument list, taking due care for special first level cases */ 943 944 fixargs(doput, p0) 945 int doput; /* doput is true if the function is not intrinsic; 946 was used to decide whether to do a putconst, 947 but this is no longer done here (Feb82)*/ 948 struct Listblock *p0; 949 { 950 register chainp p; 951 register tagptr q, t; 952 register int qtag; 953 int nargs; 954 Addrp mkscalar(); 955 956 nargs = 0; 957 if(p0) 958 for(p = p0->listp ; p ; p = p->nextp) 959 { 960 ++nargs; 961 q = p->datap; 962 qtag = q->tag; 963 if(qtag == TCONST) 964 { 965 966 /* 967 if(q->constblock.vtype == TYSHORT) 968 q = (tagptr) mkconv(tyint, q); 969 */ 970 p->datap = q ; 971 } 972 else if(qtag==TPRIM && q->primblock.argsp==0 && 973 q->primblock.namep->vclass==CLPROC) 974 p->datap = (tagptr) mkaddr(q->primblock.namep); 975 else if(qtag==TPRIM && q->primblock.argsp==0 && 976 q->primblock.namep->vdim!=NULL) 977 p->datap = (tagptr) mkscalar(q->primblock.namep); 978 else if(qtag==TPRIM && q->primblock.argsp==0 && 979 q->primblock.namep->vdovar && 980 (t = (tagptr) memversion(q->primblock.namep)) ) 981 p->datap = (tagptr) fixtype(t); 982 else 983 p->datap = (tagptr) fixtype(q); 984 } 985 return(nargs); 986 } 987 988 989 Addrp mkscalar(np) 990 register Namep np; 991 { 992 register Addrp ap; 993 994 vardcl(np); 995 ap = mkaddr(np); 996 997 #if TARGET == VAX || TARGET == TAHOE 998 /* on the VAX, prolog causes array arguments 999 to point at the (0,...,0) element, except when 1000 subscript checking is on 1001 */ 1002 #ifdef SDB 1003 if( !checksubs && !sdbflag && np->vstg==STGARG) 1004 #else 1005 if( !checksubs && np->vstg==STGARG) 1006 #endif 1007 { 1008 register struct Dimblock *dp; 1009 dp = np->vdim; 1010 frexpr(ap->memoffset); 1011 ap->memoffset = mkexpr(OPSTAR, 1012 (np->vtype==TYCHAR ? 1013 cpexpr(np->vleng) : 1014 (tagptr)ICON(typesize[np->vtype]) ), 1015 cpexpr(dp->baseoffset) ); 1016 } 1017 #endif 1018 return(ap); 1019 } 1020 1021 1022 1023 1024 1025 expptr mkfunct(p) 1026 register struct Primblock *p; 1027 { 1028 struct Entrypoint *ep; 1029 Addrp ap; 1030 struct Extsym *extp; 1031 register Namep np; 1032 register expptr q; 1033 expptr intrcall(), stfcall(); 1034 int k, nargs; 1035 int class; 1036 1037 if(p->tag != TPRIM) 1038 return( errnode() ); 1039 1040 np = p->namep; 1041 class = np->vclass; 1042 1043 if(class == CLUNKNOWN) 1044 { 1045 np->vclass = class = CLPROC; 1046 if(np->vstg == STGUNKNOWN) 1047 { 1048 if(np->vtype!=TYSUBR && (k = intrfunct(np->varname)) ) 1049 { 1050 np->vstg = STGINTR; 1051 np->vardesc.varno = k; 1052 np->vprocclass = PINTRINSIC; 1053 } 1054 else 1055 { 1056 extp = mkext( varunder(VL,np->varname) ); 1057 if(extp->extstg == STGCOMMON) 1058 warn("conflicting declarations", np->varname); 1059 extp->extstg = STGEXT; 1060 np->vstg = STGEXT; 1061 np->vardesc.varno = extp - extsymtab; 1062 np->vprocclass = PEXTERNAL; 1063 } 1064 } 1065 else if(np->vstg==STGARG) 1066 { 1067 if(np->vtype!=TYCHAR && !ftn66flag) 1068 warn("Dummy procedure not declared EXTERNAL. Code may be wrong."); 1069 np->vprocclass = PEXTERNAL; 1070 } 1071 } 1072 1073 if(class != CLPROC) 1074 fatali("invalid class code %d for function", class); 1075 if(p->fcharp || p->lcharp) 1076 { 1077 err("no substring of function call"); 1078 goto error; 1079 } 1080 impldcl(np); 1081 nargs = fixargs( np->vprocclass!=PINTRINSIC, p->argsp); 1082 1083 switch(np->vprocclass) 1084 { 1085 case PEXTERNAL: 1086 ap = mkaddr(np); 1087 call: 1088 q = mkexpr(OPCALL, ap, p->argsp); 1089 if( (q->exprblock.vtype = np->vtype) == TYUNKNOWN) 1090 { 1091 err("attempt to use untyped function"); 1092 goto error; 1093 } 1094 if(np->vleng) 1095 q->exprblock.vleng = (expptr) cpexpr(np->vleng); 1096 break; 1097 1098 case PINTRINSIC: 1099 q = intrcall(np, p->argsp, nargs); 1100 break; 1101 1102 case PSTFUNCT: 1103 q = stfcall(np, p->argsp); 1104 break; 1105 1106 case PTHISPROC: 1107 warn("recursive call"); 1108 for(ep = entries ; ep ; ep = ep->entnextp) 1109 if(ep->enamep == np) 1110 break; 1111 if(ep == NULL) 1112 fatal("mkfunct: impossible recursion"); 1113 ap = builtin(np->vtype, varstr(XL, ep->entryname->extname) ); 1114 goto call; 1115 1116 default: 1117 fatali("mkfunct: impossible vprocclass %d", 1118 (int) (np->vprocclass) ); 1119 } 1120 free( (charptr) p ); 1121 return(q); 1122 1123 error: 1124 frexpr(p); 1125 return( errnode() ); 1126 } 1127 1128 1129 1130 LOCAL expptr stfcall(np, actlist) 1131 Namep np; 1132 struct Listblock *actlist; 1133 { 1134 register chainp actuals; 1135 int nargs; 1136 chainp oactp, formals; 1137 int type; 1138 expptr q, rhs, ap; 1139 Namep tnp; 1140 register struct Rplblock *rp; 1141 struct Rplblock *tlist; 1142 1143 if(actlist) 1144 { 1145 actuals = actlist->listp; 1146 free( (charptr) actlist); 1147 } 1148 else 1149 actuals = NULL; 1150 oactp = actuals; 1151 1152 nargs = 0; 1153 tlist = NULL; 1154 if( (type = np->vtype) == TYUNKNOWN) 1155 { 1156 err("attempt to use untyped statement function"); 1157 q = errnode(); 1158 goto ret; 1159 } 1160 formals = (chainp) (np->varxptr.vstfdesc->datap); 1161 rhs = (expptr) (np->varxptr.vstfdesc->nextp); 1162 1163 /* copy actual arguments into temporaries */ 1164 while(actuals!=NULL && formals!=NULL) 1165 { 1166 rp = ALLOC(Rplblock); 1167 rp->rplnp = tnp = (Namep) (formals->datap); 1168 ap = fixtype(actuals->datap); 1169 if(tnp->vtype==ap->headblock.vtype && tnp->vtype!=TYCHAR 1170 && (ap->tag==TCONST || ap->tag==TADDR || ap->tag==TTEMP) ) 1171 { 1172 rp->rplvp = (expptr) ap; 1173 rp->rplxp = NULL; 1174 rp->rpltag = ap->tag; 1175 } 1176 else { 1177 rp->rplvp = (expptr) mktemp(tnp->vtype, tnp->vleng); 1178 rp->rplxp = fixtype( mkexpr(OPASSIGN, cpexpr(rp->rplvp), ap) ); 1179 if( (rp->rpltag = rp->rplxp->tag) == TERROR) 1180 err("disagreement of argument types in statement function call"); 1181 else if(tnp->vtype!=ap->headblock.vtype) 1182 warn("argument type mismatch in statement function"); 1183 } 1184 rp->rplnextp = tlist; 1185 tlist = rp; 1186 actuals = actuals->nextp; 1187 formals = formals->nextp; 1188 ++nargs; 1189 } 1190 1191 if(actuals!=NULL || formals!=NULL) 1192 err("statement function definition and argument list differ"); 1193 1194 /* 1195 now push down names involved in formal argument list, then 1196 evaluate rhs of statement function definition in this environment 1197 */ 1198 1199 if(tlist) /* put tlist in front of the rpllist */ 1200 { 1201 for(rp = tlist; rp->rplnextp; rp = rp->rplnextp) 1202 ; 1203 rp->rplnextp = rpllist; 1204 rpllist = tlist; 1205 } 1206 1207 q = (expptr) mkconv(type, fixtype(cpexpr(rhs)) ); 1208 1209 /* now generate the tree ( t1=a1, (t2=a2,... , f))))) */ 1210 while(--nargs >= 0) 1211 { 1212 if(rpllist->rplxp) 1213 q = mkexpr(OPCOMMA, rpllist->rplxp, q); 1214 rp = rpllist->rplnextp; 1215 frexpr(rpllist->rplvp); 1216 free(rpllist); 1217 rpllist = rp; 1218 } 1219 1220 ret: 1221 frchain( &oactp ); 1222 return(q); 1223 } 1224 1225 1226 1227 1228 Addrp mkplace(np) 1229 register Namep np; 1230 { 1231 register Addrp s; 1232 register struct Rplblock *rp; 1233 int regn; 1234 1235 /* is name on the replace list? */ 1236 1237 for(rp = rpllist ; rp ; rp = rp->rplnextp) 1238 { 1239 if(np == rp->rplnp) 1240 { 1241 if(rp->rpltag == TNAME) 1242 { 1243 np = (Namep) (rp->rplvp); 1244 break; 1245 } 1246 else return( (Addrp) cpexpr(rp->rplvp) ); 1247 } 1248 } 1249 1250 /* is variable a DO index in a register ? */ 1251 1252 if(np->vdovar && ( (regn = inregister(np)) >= 0) ) 1253 if(np->vtype == TYERROR) 1254 return( (Addrp) errnode() ); 1255 else 1256 { 1257 s = ALLOC(Addrblock); 1258 s->tag = TADDR; 1259 s->vstg = STGREG; 1260 s->vtype = TYIREG; 1261 s->issaved = np->vsave; 1262 s->memno = regn; 1263 s->memoffset = ICON(0); 1264 return(s); 1265 } 1266 1267 vardcl(np); 1268 return(mkaddr(np)); 1269 } 1270 1271 1272 1273 1274 expptr mklhs(p) 1275 register struct Primblock *p; 1276 { 1277 expptr suboffset(); 1278 register Addrp s; 1279 Namep np; 1280 1281 if(p->tag != TPRIM) 1282 return( (expptr) p ); 1283 np = p->namep; 1284 1285 s = mkplace(np); 1286 if(s->tag!=TADDR || s->vstg==STGREG) 1287 { 1288 free( (charptr) p ); 1289 return( (expptr) s ); 1290 } 1291 1292 /* compute the address modified by subscripts */ 1293 1294 s->memoffset = mkexpr(OPPLUS, s->memoffset, suboffset(p) ); 1295 frexpr(p->argsp); 1296 p->argsp = NULL; 1297 1298 /* now do substring part */ 1299 1300 if(p->fcharp || p->lcharp) 1301 { 1302 if(np->vtype != TYCHAR) 1303 errstr("substring of noncharacter %s", varstr(VL,np->varname)); 1304 else { 1305 if(p->lcharp == NULL) 1306 p->lcharp = (expptr) cpexpr(s->vleng); 1307 frexpr(s->vleng); 1308 if(p->fcharp) 1309 { 1310 if(p->fcharp->tag == TPRIM && p->lcharp->tag == TPRIM 1311 && p->fcharp->primblock.namep == p->lcharp->primblock.namep) 1312 /* A trivial optimization -- upper == lower */ 1313 s->vleng = ICON(1); 1314 else 1315 s->vleng = mkexpr(OPMINUS, p->lcharp, 1316 mkexpr(OPMINUS, p->fcharp, ICON(1) )); 1317 } 1318 else 1319 s->vleng = p->lcharp; 1320 } 1321 } 1322 1323 s->vleng = fixtype( s->vleng ); 1324 s->memoffset = fixtype( s->memoffset ); 1325 free( (charptr) p ); 1326 return( (expptr) s ); 1327 } 1328 1329 1330 1331 1332 1333 deregister(np) 1334 Namep np; 1335 { 1336 if(nregvar>0 && regnamep[nregvar-1]==np) 1337 { 1338 --nregvar; 1339 #if FAMILY == DMR 1340 putnreg(); 1341 #endif 1342 } 1343 } 1344 1345 1346 1347 1348 Addrp memversion(np) 1349 register Namep np; 1350 { 1351 register Addrp s; 1352 1353 if(np->vdovar==NO || (inregister(np)<0) ) 1354 return(NULL); 1355 np->vdovar = NO; 1356 s = mkplace(np); 1357 np->vdovar = YES; 1358 return(s); 1359 } 1360 1361 1362 1363 inregister(np) 1364 register Namep np; 1365 { 1366 register int i; 1367 1368 for(i = 0 ; i < nregvar ; ++i) 1369 if(regnamep[i] == np) 1370 return( regnum[i] ); 1371 return(-1); 1372 } 1373 1374 1375 1376 1377 enregister(np) 1378 Namep np; 1379 { 1380 if( inregister(np) >= 0) 1381 return(YES); 1382 if(nregvar >= maxregvar) 1383 return(NO); 1384 vardcl(np); 1385 if( ONEOF(np->vtype, MSKIREG) ) 1386 { 1387 regnamep[nregvar++] = np; 1388 if(nregvar > highregvar) 1389 highregvar = nregvar; 1390 #if FAMILY == DMR 1391 putnreg(); 1392 #endif 1393 return(YES); 1394 } 1395 else 1396 return(NO); 1397 } 1398 1399 1400 1401 1402 expptr suboffset(p) 1403 register struct Primblock *p; 1404 { 1405 int n; 1406 expptr size; 1407 expptr oftwo(); 1408 chainp cp; 1409 expptr offp, prod; 1410 expptr subcheck(); 1411 struct Dimblock *dimp; 1412 expptr sub[MAXDIM+1]; 1413 register Namep np; 1414 1415 np = p->namep; 1416 offp = ICON(0); 1417 n = 0; 1418 if(p->argsp) 1419 for(cp = p->argsp->listp ; cp ; ++n, cp = cp->nextp) 1420 { 1421 sub[n] = fixtype(cpexpr(cp->datap)); 1422 if ( ! ISINT(sub[n]->headblock.vtype)) { 1423 errstr("%s: non-integer subscript expression", 1424 varstr(VL, np->varname) ); 1425 /* Provide a substitute -- go on to find more errors */ 1426 frexpr(sub[n]); 1427 sub[n] = ICON(1); 1428 } 1429 if(n > maxdim) 1430 { 1431 char str[28+VL]; 1432 sprintf(str, "%s: more than %d subscripts", 1433 varstr(VL, np->varname), maxdim ); 1434 err( str ); 1435 break; 1436 } 1437 } 1438 1439 dimp = np->vdim; 1440 if(n>0 && dimp==NULL) 1441 errstr("%s: subscripts on scalar variable", 1442 varstr(VL, np->varname), maxdim ); 1443 else if(dimp && dimp->ndim!=n) 1444 errstr("wrong number of subscripts on %s", 1445 varstr(VL, np->varname) ); 1446 else if(n > 0) 1447 { 1448 prod = sub[--n]; 1449 while( --n >= 0) 1450 prod = mkexpr(OPPLUS, sub[n], 1451 mkexpr(OPSTAR, prod, cpexpr(dimp->dims[n].dimsize)) ); 1452 #if TARGET == VAX || TARGET == TAHOE 1453 #ifdef SDB 1454 if(checksubs || np->vstg!=STGARG || sdbflag) 1455 #else 1456 if(checksubs || np->vstg!=STGARG) 1457 #endif 1458 prod = mkexpr(OPMINUS, prod, cpexpr(dimp->baseoffset)); 1459 #else 1460 prod = mkexpr(OPMINUS, prod, cpexpr(dimp->baseoffset)); 1461 #endif 1462 if(checksubs) 1463 prod = subcheck(np, prod); 1464 size = np->vtype == TYCHAR ? 1465 (expptr) cpexpr(np->vleng) : ICON(typesize[np->vtype]); 1466 if (!oftwo(size)) 1467 prod = mkexpr(OPSTAR, prod, size); 1468 else 1469 prod = mkexpr(OPLSHIFT,prod,oftwo(size)); 1470 1471 offp = mkexpr(OPPLUS, offp, prod); 1472 } 1473 1474 if(p->fcharp && np->vtype==TYCHAR) 1475 offp = mkexpr(OPPLUS, offp, mkexpr(OPMINUS, cpexpr(p->fcharp), ICON(1) )); 1476 1477 return(offp); 1478 } 1479 1480 1481 1482 1483 expptr subcheck(np, p) 1484 Namep np; 1485 register expptr p; 1486 { 1487 struct Dimblock *dimp; 1488 expptr t, checkvar, checkcond, badcall; 1489 1490 dimp = np->vdim; 1491 if(dimp->nelt == NULL) 1492 return(p); /* don't check arrays with * bounds */ 1493 checkvar = NULL; 1494 checkcond = NULL; 1495 if( ISICON(p) ) 1496 { 1497 if(p->constblock.const.ci < 0) 1498 goto badsub; 1499 if( ISICON(dimp->nelt) ) 1500 if(p->constblock.const.ci < dimp->nelt->constblock.const.ci) 1501 return(p); 1502 else 1503 goto badsub; 1504 } 1505 if(p->tag==TADDR && p->addrblock.vstg==STGREG) 1506 { 1507 checkvar = (expptr) cpexpr(p); 1508 t = p; 1509 } 1510 else { 1511 checkvar = (expptr) mktemp(p->headblock.vtype, ENULL); 1512 t = mkexpr(OPASSIGN, cpexpr(checkvar), p); 1513 } 1514 checkcond = mkexpr(OPLT, t, cpexpr(dimp->nelt) ); 1515 if( ! ISICON(p) ) 1516 checkcond = mkexpr(OPAND, checkcond, 1517 mkexpr(OPLE, ICON(0), cpexpr(checkvar)) ); 1518 1519 badcall = call4(p->headblock.vtype, "s_rnge", 1520 mkstrcon(VL, np->varname), 1521 mkconv(TYLONG, cpexpr(checkvar)), 1522 mkstrcon(XL, procname), 1523 ICON(lineno) ); 1524 badcall->exprblock.opcode = OPCCALL; 1525 p = mkexpr(OPQUEST, checkcond, 1526 mkexpr(OPCOLON, checkvar, badcall)); 1527 1528 return(p); 1529 1530 badsub: 1531 frexpr(p); 1532 errstr("subscript on variable %s out of range", varstr(VL,np->varname)); 1533 return ( ICON(0) ); 1534 } 1535 1536 1537 1538 1539 Addrp mkaddr(p) 1540 register Namep p; 1541 { 1542 struct Extsym *extp; 1543 register Addrp t; 1544 Addrp intraddr(); 1545 1546 switch( p->vstg) 1547 { 1548 case STGUNKNOWN: 1549 if(p->vclass != CLPROC) 1550 break; 1551 extp = mkext( varunder(VL, p->varname) ); 1552 extp->extstg = STGEXT; 1553 p->vstg = STGEXT; 1554 p->vardesc.varno = extp - extsymtab; 1555 p->vprocclass = PEXTERNAL; 1556 1557 case STGCOMMON: 1558 case STGEXT: 1559 case STGBSS: 1560 case STGINIT: 1561 case STGEQUIV: 1562 case STGARG: 1563 case STGLENG: 1564 case STGAUTO: 1565 t = ALLOC(Addrblock); 1566 t->tag = TADDR; 1567 if(p->vclass==CLPROC && p->vprocclass==PTHISPROC) 1568 t->vclass = CLVAR; 1569 else 1570 t->vclass = p->vclass; 1571 t->vtype = p->vtype; 1572 t->vstg = p->vstg; 1573 t->memno = p->vardesc.varno; 1574 t->issaved = p->vsave; 1575 if(p->vdim) t->isarray = YES; 1576 t->memoffset = ICON(p->voffset); 1577 if(p->vleng) 1578 { 1579 t->vleng = (expptr) cpexpr(p->vleng); 1580 if( ISICON(t->vleng) ) 1581 t->varleng = t->vleng->constblock.const.ci; 1582 } 1583 if (p->vstg == STGBSS) 1584 t->varsize = p->varsize; 1585 else if (p->vstg == STGEQUIV) 1586 t->varsize = eqvclass[t->memno].eqvleng; 1587 return(t); 1588 1589 case STGINTR: 1590 return( intraddr(p) ); 1591 1592 } 1593 /*debug*/fprintf(diagfile,"mkaddr. vtype=%d, vclass=%d\n", p->vtype, p->vclass); 1594 badstg("mkaddr", p->vstg); 1595 /* NOTREACHED */ 1596 } 1597 1598 1599 1600 1601 Addrp mkarg(type, argno) 1602 int type, argno; 1603 { 1604 register Addrp p; 1605 1606 p = ALLOC(Addrblock); 1607 p->tag = TADDR; 1608 p->vtype = type; 1609 p->vclass = CLVAR; 1610 p->vstg = (type==TYLENG ? STGLENG : STGARG); 1611 p->memno = argno; 1612 return(p); 1613 } 1614 1615 1616 1617 1618 expptr mkprim(v, args, substr) 1619 register union 1620 { 1621 struct Paramblock paramblock; 1622 struct Nameblock nameblock; 1623 struct Headblock headblock; 1624 } *v; 1625 struct Listblock *args; 1626 chainp substr; 1627 { 1628 register struct Primblock *p; 1629 1630 if(v->headblock.vclass == CLPARAM) 1631 { 1632 if(args || substr) 1633 { 1634 errstr("no qualifiers on parameter name %s", 1635 varstr(VL,v->paramblock.varname)); 1636 frexpr(args); 1637 if(substr) 1638 { 1639 frexpr(substr->datap); 1640 frexpr(substr->nextp->datap); 1641 frchain(&substr); 1642 } 1643 frexpr(v); 1644 return( errnode() ); 1645 } 1646 return( (expptr) cpexpr(v->paramblock.paramval) ); 1647 } 1648 1649 p = ALLOC(Primblock); 1650 p->tag = TPRIM; 1651 p->vtype = v->nameblock.vtype; 1652 p->namep = (Namep) v; 1653 p->argsp = args; 1654 if(substr) 1655 { 1656 p->fcharp = (expptr) substr->datap; 1657 if (p->fcharp != ENULL && ! ISINT(p->fcharp->headblock.vtype)) 1658 p->fcharp = mkconv(TYINT, p->fcharp); 1659 p->lcharp = (expptr) substr->nextp->datap; 1660 if (p->lcharp != ENULL && ! ISINT(p->lcharp->headblock.vtype)) 1661 p->lcharp = mkconv(TYINT, p->lcharp); 1662 frchain(&substr); 1663 } 1664 return( (expptr) p); 1665 } 1666 1667 1668 1669 vardcl(v) 1670 register Namep v; 1671 { 1672 int nelt; 1673 struct Dimblock *t; 1674 Addrp p; 1675 expptr neltp; 1676 int eltsize; 1677 int varsize; 1678 int tsize; 1679 int align; 1680 1681 if(v->vdcldone) 1682 return; 1683 if(v->vclass == CLNAMELIST) 1684 return; 1685 1686 if(v->vtype == TYUNKNOWN) 1687 impldcl(v); 1688 if(v->vclass == CLUNKNOWN) 1689 v->vclass = CLVAR; 1690 else if(v->vclass!=CLVAR && v->vprocclass!=PTHISPROC) 1691 { 1692 dclerr("used both as variable and non-variable", v); 1693 return; 1694 } 1695 if(v->vstg==STGUNKNOWN) 1696 v->vstg = implstg[ letter(v->varname[0]) ]; 1697 1698 switch(v->vstg) 1699 { 1700 case STGBSS: 1701 v->vardesc.varno = ++lastvarno; 1702 if (v->vclass != CLVAR) 1703 break; 1704 nelt = 1; 1705 t = v->vdim; 1706 if (t) 1707 { 1708 neltp = t->nelt; 1709 if (neltp && ISICON(neltp)) 1710 nelt = neltp->constblock.const.ci; 1711 else 1712 dclerr("improperly dimensioned array", v); 1713 } 1714 1715 if (v->vtype == TYCHAR) 1716 { 1717 v->vleng = fixtype(v->vleng); 1718 if (v->vleng == NULL) 1719 eltsize = typesize[TYCHAR]; 1720 else if (ISICON(v->vleng)) 1721 eltsize = typesize[TYCHAR] * 1722 v->vleng->constblock.const.ci; 1723 else if (v->vleng->tag != TERROR) 1724 { 1725 errstr("nonconstant string length on %s", 1726 varstr(VL, v->varname)); 1727 eltsize = 0; 1728 } 1729 } 1730 else 1731 eltsize = typesize[v->vtype]; 1732 1733 v->varsize = nelt * eltsize; 1734 break; 1735 case STGAUTO: 1736 if(v->vclass==CLPROC && v->vprocclass==PTHISPROC) 1737 break; 1738 nelt = 1; 1739 if(t = v->vdim) 1740 if( (neltp = t->nelt) && ISCONST(neltp) ) 1741 nelt = neltp->constblock.const.ci; 1742 else 1743 dclerr("adjustable automatic array", v); 1744 p = autovar(nelt, v->vtype, v->vleng); 1745 v->vardesc.varno = p->memno; 1746 v->voffset = p->memoffset->constblock.const.ci; 1747 frexpr(p); 1748 break; 1749 1750 default: 1751 break; 1752 } 1753 v->vdcldone = YES; 1754 } 1755 1756 1757 1758 1759 impldcl(p) 1760 register Namep p; 1761 { 1762 register int k; 1763 int type, leng; 1764 1765 if(p->vdcldone || (p->vclass==CLPROC && p->vprocclass==PINTRINSIC) ) 1766 return; 1767 if(p->vtype == TYUNKNOWN) 1768 { 1769 k = letter(p->varname[0]); 1770 type = impltype[ k ]; 1771 leng = implleng[ k ]; 1772 if(type == TYUNKNOWN) 1773 { 1774 if(p->vclass == CLPROC) 1775 dclerr("attempt to use function of undefined type", p); 1776 else 1777 dclerr("attempt to use undefined variable", p); 1778 type = TYERROR; 1779 leng = 1; 1780 } 1781 settype(p, type, leng); 1782 } 1783 } 1784 1785 1786 1787 1788 LOCAL letter(c) 1789 register int c; 1790 { 1791 if( isupper(c) ) 1792 c = tolower(c); 1793 return(c - 'a'); 1794 } 1795 1796 #define ICONEQ(z, c) (ISICON(z) && z->constblock.const.ci==c) 1797 #define COMMUTE { e = lp; lp = rp; rp = e; } 1798 1799 1800 expptr mkexpr(opcode, lp, rp) 1801 int opcode; 1802 register expptr lp, rp; 1803 { 1804 register expptr e, e1; 1805 int etype; 1806 int ltype, rtype; 1807 int ltag, rtag; 1808 expptr q, q1; 1809 expptr fold(); 1810 int k; 1811 1812 ltype = lp->headblock.vtype; 1813 ltag = lp->tag; 1814 if(rp && opcode!=OPCALL && opcode!=OPCCALL) 1815 { 1816 rtype = rp->headblock.vtype; 1817 rtag = rp->tag; 1818 } 1819 else { 1820 rtype = 0; 1821 rtag = 0; 1822 } 1823 1824 /* 1825 * Yuck. Why can't we fold constants AFTER 1826 * variables are implicitly declared??? 1827 */ 1828 if(ltype == TYUNKNOWN && ltag == TPRIM && lp->primblock.argsp == NULL) 1829 { 1830 k = letter(lp->primblock.namep->varname[0]); 1831 ltype = impltype[ k ]; 1832 } 1833 if(rtype == TYUNKNOWN && rtag == TPRIM && rp->primblock.argsp == NULL) 1834 { 1835 k = letter(rp->primblock.namep->varname[0]); 1836 rtype = impltype[ k ]; 1837 } 1838 1839 etype = cktype(opcode, ltype, rtype); 1840 if(etype == TYERROR) 1841 goto error; 1842 1843 if(etype != TYUNKNOWN) 1844 switch(opcode) 1845 { 1846 /* check for multiplication by 0 and 1 and addition to 0 */ 1847 1848 case OPSTAR: 1849 if( ISCONST(lp) ) 1850 COMMUTE 1851 1852 if( ISICON(rp) ) 1853 { 1854 if(rp->constblock.const.ci == 0) 1855 { 1856 if(etype == TYUNKNOWN) 1857 break; 1858 rp = mkconv(etype, rp); 1859 goto retright; 1860 } 1861 if ((lp->tag == TEXPR) && 1862 ((lp->exprblock.opcode == OPPLUS) || 1863 (lp->exprblock.opcode == OPMINUS)) && 1864 ISCONST(lp->exprblock.rightp) && 1865 ISINT(lp->exprblock.rightp->constblock.vtype)) 1866 { 1867 q1 = mkexpr(OPSTAR, lp->exprblock.rightp, 1868 cpexpr(rp)); 1869 q = mkexpr(OPSTAR, lp->exprblock.leftp, rp); 1870 q = mkexpr(lp->exprblock.opcode, q, q1); 1871 free ((char *) lp); 1872 return q; 1873 } 1874 else 1875 goto mulop; 1876 } 1877 break; 1878 1879 case OPSLASH: 1880 case OPMOD: 1881 if( ICONEQ(rp, 0) ) 1882 { 1883 err("attempted division by zero"); 1884 rp = ICON(1); 1885 break; 1886 } 1887 if(opcode == OPMOD) 1888 break; 1889 1890 1891 mulop: 1892 if( ISICON(rp) ) 1893 { 1894 if(rp->constblock.const.ci == 1) 1895 goto retleft; 1896 1897 if(rp->constblock.const.ci == -1) 1898 { 1899 frexpr(rp); 1900 return( mkexpr(OPNEG, lp, PNULL) ); 1901 } 1902 } 1903 1904 if( ISSTAROP(lp) && ISICON(lp->exprblock.rightp) ) 1905 { 1906 if(opcode == OPSTAR) 1907 e = mkexpr(OPSTAR, lp->exprblock.rightp, rp); 1908 else if(ISICON(rp) && 1909 (lp->exprblock.rightp->constblock.const.ci % 1910 rp->constblock.const.ci) == 0) 1911 e = mkexpr(OPSLASH, lp->exprblock.rightp, rp); 1912 else break; 1913 1914 e1 = lp->exprblock.leftp; 1915 free( (charptr) lp ); 1916 return( mkexpr(OPSTAR, e1, e) ); 1917 } 1918 break; 1919 1920 1921 case OPPLUS: 1922 if( ISCONST(lp) ) 1923 COMMUTE 1924 goto addop; 1925 1926 case OPMINUS: 1927 if( ICONEQ(lp, 0) ) 1928 { 1929 frexpr(lp); 1930 return( mkexpr(OPNEG, rp, ENULL) ); 1931 } 1932 1933 if( ISCONST(rp) ) 1934 { 1935 opcode = OPPLUS; 1936 consnegop(rp); 1937 } 1938 1939 addop: 1940 if( ISICON(rp) ) 1941 { 1942 if(rp->constblock.const.ci == 0) 1943 goto retleft; 1944 if( ISPLUSOP(lp) && ISICON(lp->exprblock.rightp) ) 1945 { 1946 e = mkexpr(OPPLUS, lp->exprblock.rightp, rp); 1947 e1 = lp->exprblock.leftp; 1948 free( (charptr) lp ); 1949 return( mkexpr(OPPLUS, e1, e) ); 1950 } 1951 } 1952 break; 1953 1954 1955 case OPPOWER: 1956 break; 1957 1958 case OPNEG: 1959 if(ltag==TEXPR && lp->exprblock.opcode==OPNEG) 1960 { 1961 e = lp->exprblock.leftp; 1962 free( (charptr) lp ); 1963 return(e); 1964 } 1965 break; 1966 1967 case OPNOT: 1968 if(ltag==TEXPR && lp->exprblock.opcode==OPNOT) 1969 { 1970 e = lp->exprblock.leftp; 1971 free( (charptr) lp ); 1972 return(e); 1973 } 1974 break; 1975 1976 case OPCALL: 1977 case OPCCALL: 1978 etype = ltype; 1979 if(rp!=NULL && rp->listblock.listp==NULL) 1980 { 1981 free( (charptr) rp ); 1982 rp = NULL; 1983 } 1984 break; 1985 1986 case OPAND: 1987 case OPOR: 1988 if( ISCONST(lp) ) 1989 COMMUTE 1990 1991 if( ISCONST(rp) ) 1992 { 1993 if(rp->constblock.const.ci == 0) 1994 if(opcode == OPOR) 1995 goto retleft; 1996 else 1997 goto retright; 1998 else if(opcode == OPOR) 1999 goto retright; 2000 else 2001 goto retleft; 2002 } 2003 case OPLSHIFT: 2004 if (ISICON(rp)) 2005 { 2006 if (rp->constblock.const.ci == 0) 2007 goto retleft; 2008 if ((lp->tag == TEXPR) && 2009 ((lp->exprblock.opcode == OPPLUS) || 2010 (lp->exprblock.opcode == OPMINUS)) && 2011 ISICON(lp->exprblock.rightp)) 2012 { 2013 q1 = mkexpr(OPLSHIFT, lp->exprblock.rightp, 2014 cpexpr(rp)); 2015 q = mkexpr(OPLSHIFT, lp->exprblock.leftp, rp); 2016 q = mkexpr(lp->exprblock.opcode, q, q1); 2017 free((char *) lp); 2018 return q; 2019 } 2020 } 2021 2022 case OPEQV: 2023 case OPNEQV: 2024 2025 case OPBITAND: 2026 case OPBITOR: 2027 case OPBITXOR: 2028 case OPBITNOT: 2029 case OPRSHIFT: 2030 2031 case OPLT: 2032 case OPGT: 2033 case OPLE: 2034 case OPGE: 2035 case OPEQ: 2036 case OPNE: 2037 2038 case OPCONCAT: 2039 break; 2040 case OPMIN: 2041 case OPMAX: 2042 2043 case OPASSIGN: 2044 case OPPLUSEQ: 2045 case OPSTAREQ: 2046 2047 case OPCONV: 2048 case OPADDR: 2049 2050 case OPCOMMA: 2051 case OPQUEST: 2052 case OPCOLON: 2053 2054 case OPPAREN: 2055 break; 2056 2057 default: 2058 badop("mkexpr", opcode); 2059 } 2060 2061 e = (expptr) ALLOC(Exprblock); 2062 e->exprblock.tag = TEXPR; 2063 e->exprblock.opcode = opcode; 2064 e->exprblock.vtype = etype; 2065 e->exprblock.leftp = lp; 2066 e->exprblock.rightp = rp; 2067 if(ltag==TCONST && (rp==0 || rtag==TCONST) ) 2068 e = fold(e); 2069 return(e); 2070 2071 retleft: 2072 frexpr(rp); 2073 return(lp); 2074 2075 retright: 2076 frexpr(lp); 2077 return(rp); 2078 2079 error: 2080 frexpr(lp); 2081 if(rp && opcode!=OPCALL && opcode!=OPCCALL) 2082 frexpr(rp); 2083 return( errnode() ); 2084 } 2085 2086 #define ERR(s) { errs = s; goto error; } 2087 2088 cktype(op, lt, rt) 2089 register int op, lt, rt; 2090 { 2091 char *errs; 2092 2093 if(lt==TYERROR || rt==TYERROR) 2094 goto error1; 2095 2096 if(lt==TYUNKNOWN) 2097 return(TYUNKNOWN); 2098 if(rt==TYUNKNOWN) 2099 if (op!=OPNOT && op!=OPBITNOT && op!=OPNEG && op!=OPCALL && 2100 op!=OPCCALL && op!=OPADDR && op!=OPPAREN) 2101 return(TYUNKNOWN); 2102 2103 switch(op) 2104 { 2105 case OPPLUS: 2106 case OPMINUS: 2107 case OPSTAR: 2108 case OPSLASH: 2109 case OPPOWER: 2110 case OPMOD: 2111 if( ISNUMERIC(lt) && ISNUMERIC(rt) ) 2112 return( maxtype(lt, rt) ); 2113 ERR("nonarithmetic operand of arithmetic operator") 2114 2115 case OPNEG: 2116 if( ISNUMERIC(lt) ) 2117 return(lt); 2118 ERR("nonarithmetic operand of negation") 2119 2120 case OPNOT: 2121 if(lt == TYLOGICAL) 2122 return(TYLOGICAL); 2123 ERR("NOT of nonlogical") 2124 2125 case OPAND: 2126 case OPOR: 2127 case OPEQV: 2128 case OPNEQV: 2129 if(lt==TYLOGICAL && rt==TYLOGICAL) 2130 return(TYLOGICAL); 2131 ERR("nonlogical operand of logical operator") 2132 2133 case OPLT: 2134 case OPGT: 2135 case OPLE: 2136 case OPGE: 2137 case OPEQ: 2138 case OPNE: 2139 if(lt==TYCHAR || rt==TYCHAR || lt==TYLOGICAL || rt==TYLOGICAL) 2140 { 2141 if(lt != rt) 2142 ERR("illegal comparison") 2143 } 2144 2145 else if( ISCOMPLEX(lt) || ISCOMPLEX(rt) ) 2146 { 2147 if(op!=OPEQ && op!=OPNE) 2148 ERR("order comparison of complex data") 2149 } 2150 2151 else if( ! ISNUMERIC(lt) || ! ISNUMERIC(rt) ) 2152 ERR("comparison of nonarithmetic data") 2153 return(TYLOGICAL); 2154 2155 case OPCONCAT: 2156 if(lt==TYCHAR && rt==TYCHAR) 2157 return(TYCHAR); 2158 ERR("concatenation of nonchar data") 2159 2160 case OPCALL: 2161 case OPCCALL: 2162 return(lt); 2163 2164 case OPADDR: 2165 return(TYADDR); 2166 2167 case OPCONV: 2168 if(ISCOMPLEX(lt)) 2169 { 2170 if(ISNUMERIC(rt)) 2171 return(lt); 2172 ERR("impossible conversion") 2173 } 2174 if(rt == 0) 2175 return(0); 2176 if(lt==TYCHAR && ISINT(rt) ) 2177 return(TYCHAR); 2178 case OPASSIGN: 2179 case OPPLUSEQ: 2180 case OPSTAREQ: 2181 if( ISINT(lt) && rt==TYCHAR) 2182 return(lt); 2183 if(lt==TYCHAR || rt==TYCHAR || lt==TYLOGICAL || rt==TYLOGICAL) 2184 if(op!=OPASSIGN || lt!=rt) 2185 { 2186 /* debug fprintf(diagfile, " lt=%d, rt=%d, op=%d\n", lt, rt, op); */ 2187 /* debug fatal("impossible conversion. possible compiler bug"); */ 2188 ERR("impossible conversion") 2189 } 2190 return(lt); 2191 2192 case OPMIN: 2193 case OPMAX: 2194 case OPBITOR: 2195 case OPBITAND: 2196 case OPBITXOR: 2197 case OPBITNOT: 2198 case OPLSHIFT: 2199 case OPRSHIFT: 2200 case OPPAREN: 2201 return(lt); 2202 2203 case OPCOMMA: 2204 case OPQUEST: 2205 case OPCOLON: 2206 return(rt); 2207 2208 default: 2209 badop("cktype", op); 2210 } 2211 error: err(errs); 2212 error1: return(TYERROR); 2213 } 2214 2215 LOCAL expptr fold(e) 2216 register expptr e; 2217 { 2218 Constp p; 2219 register expptr lp, rp; 2220 int etype, mtype, ltype, rtype, opcode; 2221 int i, ll, lr; 2222 char *q, *s; 2223 union Constant lcon, rcon; 2224 2225 opcode = e->exprblock.opcode; 2226 etype = e->exprblock.vtype; 2227 2228 lp = e->exprblock.leftp; 2229 ltype = lp->headblock.vtype; 2230 rp = e->exprblock.rightp; 2231 2232 if(rp == 0) 2233 switch(opcode) 2234 { 2235 case OPNOT: 2236 lp->constblock.const.ci = ! lp->constblock.const.ci; 2237 return(lp); 2238 2239 case OPBITNOT: 2240 lp->constblock.const.ci = ~ lp->constblock.const.ci; 2241 return(lp); 2242 2243 case OPNEG: 2244 consnegop(lp); 2245 return(lp); 2246 2247 case OPCONV: 2248 case OPADDR: 2249 case OPPAREN: 2250 return(e); 2251 2252 default: 2253 badop("fold", opcode); 2254 } 2255 2256 rtype = rp->headblock.vtype; 2257 2258 p = ALLOC(Constblock); 2259 p->tag = TCONST; 2260 p->vtype = etype; 2261 p->vleng = e->exprblock.vleng; 2262 2263 switch(opcode) 2264 { 2265 case OPCOMMA: 2266 case OPQUEST: 2267 case OPCOLON: 2268 return(e); 2269 2270 case OPAND: 2271 p->const.ci = lp->constblock.const.ci && 2272 rp->constblock.const.ci; 2273 break; 2274 2275 case OPOR: 2276 p->const.ci = lp->constblock.const.ci || 2277 rp->constblock.const.ci; 2278 break; 2279 2280 case OPEQV: 2281 p->const.ci = lp->constblock.const.ci == 2282 rp->constblock.const.ci; 2283 break; 2284 2285 case OPNEQV: 2286 p->const.ci = lp->constblock.const.ci != 2287 rp->constblock.const.ci; 2288 break; 2289 2290 case OPBITAND: 2291 p->const.ci = lp->constblock.const.ci & 2292 rp->constblock.const.ci; 2293 break; 2294 2295 case OPBITOR: 2296 p->const.ci = lp->constblock.const.ci | 2297 rp->constblock.const.ci; 2298 break; 2299 2300 case OPBITXOR: 2301 p->const.ci = lp->constblock.const.ci ^ 2302 rp->constblock.const.ci; 2303 break; 2304 2305 case OPLSHIFT: 2306 p->const.ci = lp->constblock.const.ci << 2307 rp->constblock.const.ci; 2308 break; 2309 2310 case OPRSHIFT: 2311 p->const.ci = lp->constblock.const.ci >> 2312 rp->constblock.const.ci; 2313 break; 2314 2315 case OPCONCAT: 2316 ll = lp->constblock.vleng->constblock.const.ci; 2317 lr = rp->constblock.vleng->constblock.const.ci; 2318 p->const.ccp = q = (char *) ckalloc(ll+lr); 2319 p->vleng = ICON(ll+lr); 2320 s = lp->constblock.const.ccp; 2321 for(i = 0 ; i < ll ; ++i) 2322 *q++ = *s++; 2323 s = rp->constblock.const.ccp; 2324 for(i = 0; i < lr; ++i) 2325 *q++ = *s++; 2326 break; 2327 2328 2329 case OPPOWER: 2330 if( ! ISINT(rtype) ) 2331 return(e); 2332 conspower(&(p->const), lp, rp->constblock.const.ci); 2333 break; 2334 2335 2336 default: 2337 if(ltype == TYCHAR) 2338 { 2339 lcon.ci = cmpstr(lp->constblock.const.ccp, 2340 rp->constblock.const.ccp, 2341 lp->constblock.vleng->constblock.const.ci, 2342 rp->constblock.vleng->constblock.const.ci); 2343 rcon.ci = 0; 2344 mtype = tyint; 2345 } 2346 else { 2347 mtype = maxtype(ltype, rtype); 2348 consconv(mtype, &lcon, ltype, &(lp->constblock.const) ); 2349 consconv(mtype, &rcon, rtype, &(rp->constblock.const) ); 2350 } 2351 consbinop(opcode, mtype, &(p->const), &lcon, &rcon); 2352 break; 2353 } 2354 2355 frexpr(e); 2356 return( (expptr) p ); 2357 } 2358 2359 2360 2361 /* assign constant l = r , doing coercion */ 2362 2363 consconv(lt, lv, rt, rv) 2364 int lt, rt; 2365 register union Constant *lv, *rv; 2366 { 2367 switch(lt) 2368 { 2369 case TYCHAR: 2370 *(lv->ccp = (char *) ckalloc(1)) = rv->ci; 2371 break; 2372 2373 case TYSHORT: 2374 case TYLONG: 2375 if(rt == TYCHAR) 2376 lv->ci = rv->ccp[0]; 2377 else if( ISINT(rt) ) 2378 lv->ci = rv->ci; 2379 else lv->ci = rv->cd[0]; 2380 break; 2381 2382 case TYCOMPLEX: 2383 case TYDCOMPLEX: 2384 switch(rt) 2385 { 2386 case TYSHORT: 2387 case TYLONG: 2388 /* fall through and do real assignment of 2389 first element 2390 */ 2391 case TYREAL: 2392 case TYDREAL: 2393 lv->cd[1] = 0; break; 2394 case TYCOMPLEX: 2395 case TYDCOMPLEX: 2396 lv->cd[1] = rv->cd[1]; break; 2397 } 2398 2399 case TYREAL: 2400 case TYDREAL: 2401 if( ISINT(rt) ) 2402 lv->cd[0] = rv->ci; 2403 else lv->cd[0] = rv->cd[0]; 2404 if( lt == TYREAL) 2405 { 2406 float f = lv->cd[0]; 2407 lv->cd[0] = f; 2408 } 2409 break; 2410 2411 case TYLOGICAL: 2412 lv->ci = rv->ci; 2413 break; 2414 } 2415 } 2416 2417 2418 2419 consnegop(p) 2420 register Constp p; 2421 { 2422 switch(p->vtype) 2423 { 2424 case TYSHORT: 2425 case TYLONG: 2426 p->const.ci = - p->const.ci; 2427 break; 2428 2429 case TYCOMPLEX: 2430 case TYDCOMPLEX: 2431 p->const.cd[1] = - p->const.cd[1]; 2432 /* fall through and do the real parts */ 2433 case TYREAL: 2434 case TYDREAL: 2435 p->const.cd[0] = - p->const.cd[0]; 2436 break; 2437 default: 2438 badtype("consnegop", p->vtype); 2439 } 2440 } 2441 2442 2443 2444 LOCAL conspower(powp, ap, n) 2445 register union Constant *powp; 2446 Constp ap; 2447 ftnint n; 2448 { 2449 register int type; 2450 union Constant x; 2451 2452 switch(type = ap->vtype) /* pow = 1 */ 2453 { 2454 case TYSHORT: 2455 case TYLONG: 2456 powp->ci = 1; 2457 break; 2458 case TYCOMPLEX: 2459 case TYDCOMPLEX: 2460 powp->cd[1] = 0; 2461 case TYREAL: 2462 case TYDREAL: 2463 powp->cd[0] = 1; 2464 break; 2465 default: 2466 badtype("conspower", type); 2467 } 2468 2469 if(n == 0) 2470 return; 2471 if(n < 0) 2472 { 2473 if( ISINT(type) ) 2474 { 2475 if (ap->const.ci == 0) 2476 err("zero raised to a negative power"); 2477 else if (ap->const.ci == 1) 2478 return; 2479 else if (ap->const.ci == -1) 2480 { 2481 if (n < -2) 2482 n = n + 2; 2483 n = -n; 2484 if (n % 2 == 1) 2485 powp->ci = -1; 2486 } 2487 else 2488 powp->ci = 0; 2489 return; 2490 } 2491 n = - n; 2492 consbinop(OPSLASH, type, &x, powp, &(ap->const)); 2493 } 2494 else 2495 consbinop(OPSTAR, type, &x, powp, &(ap->const)); 2496 2497 for( ; ; ) 2498 { 2499 if(n & 01) 2500 consbinop(OPSTAR, type, powp, powp, &x); 2501 if(n >>= 1) 2502 consbinop(OPSTAR, type, &x, &x, &x); 2503 else 2504 break; 2505 } 2506 } 2507 2508 2509 2510 /* do constant operation cp = a op b */ 2511 2512 2513 LOCAL consbinop(opcode, type, cp, ap, bp) 2514 int opcode, type; 2515 register union Constant *ap, *bp, *cp; 2516 { 2517 int k; 2518 double temp; 2519 2520 switch(opcode) 2521 { 2522 case OPPLUS: 2523 switch(type) 2524 { 2525 case TYSHORT: 2526 case TYLONG: 2527 cp->ci = ap->ci + bp->ci; 2528 break; 2529 case TYCOMPLEX: 2530 case TYDCOMPLEX: 2531 cp->cd[1] = ap->cd[1] + bp->cd[1]; 2532 case TYREAL: 2533 case TYDREAL: 2534 cp->cd[0] = ap->cd[0] + bp->cd[0]; 2535 break; 2536 } 2537 break; 2538 2539 case OPMINUS: 2540 switch(type) 2541 { 2542 case TYSHORT: 2543 case TYLONG: 2544 cp->ci = ap->ci - bp->ci; 2545 break; 2546 case TYCOMPLEX: 2547 case TYDCOMPLEX: 2548 cp->cd[1] = ap->cd[1] - bp->cd[1]; 2549 case TYREAL: 2550 case TYDREAL: 2551 cp->cd[0] = ap->cd[0] - bp->cd[0]; 2552 break; 2553 } 2554 break; 2555 2556 case OPSTAR: 2557 switch(type) 2558 { 2559 case TYSHORT: 2560 case TYLONG: 2561 cp->ci = ap->ci * bp->ci; 2562 break; 2563 case TYREAL: 2564 case TYDREAL: 2565 cp->cd[0] = ap->cd[0] * bp->cd[0]; 2566 break; 2567 case TYCOMPLEX: 2568 case TYDCOMPLEX: 2569 temp = ap->cd[0] * bp->cd[0] - 2570 ap->cd[1] * bp->cd[1] ; 2571 cp->cd[1] = ap->cd[0] * bp->cd[1] + 2572 ap->cd[1] * bp->cd[0] ; 2573 cp->cd[0] = temp; 2574 break; 2575 } 2576 break; 2577 case OPSLASH: 2578 switch(type) 2579 { 2580 case TYSHORT: 2581 case TYLONG: 2582 cp->ci = ap->ci / bp->ci; 2583 break; 2584 case TYREAL: 2585 case TYDREAL: 2586 cp->cd[0] = ap->cd[0] / bp->cd[0]; 2587 break; 2588 case TYCOMPLEX: 2589 case TYDCOMPLEX: 2590 zdiv(cp,ap,bp); 2591 break; 2592 } 2593 break; 2594 2595 case OPMOD: 2596 if( ISINT(type) ) 2597 { 2598 cp->ci = ap->ci % bp->ci; 2599 break; 2600 } 2601 else 2602 fatal("inline mod of noninteger"); 2603 2604 default: /* relational ops */ 2605 switch(type) 2606 { 2607 case TYSHORT: 2608 case TYLONG: 2609 if(ap->ci < bp->ci) 2610 k = -1; 2611 else if(ap->ci == bp->ci) 2612 k = 0; 2613 else k = 1; 2614 break; 2615 case TYREAL: 2616 case TYDREAL: 2617 if(ap->cd[0] < bp->cd[0]) 2618 k = -1; 2619 else if(ap->cd[0] == bp->cd[0]) 2620 k = 0; 2621 else k = 1; 2622 break; 2623 case TYCOMPLEX: 2624 case TYDCOMPLEX: 2625 if(ap->cd[0] == bp->cd[0] && 2626 ap->cd[1] == bp->cd[1] ) 2627 k = 0; 2628 else k = 1; 2629 break; 2630 } 2631 2632 switch(opcode) 2633 { 2634 case OPEQ: 2635 cp->ci = (k == 0); 2636 break; 2637 case OPNE: 2638 cp->ci = (k != 0); 2639 break; 2640 case OPGT: 2641 cp->ci = (k == 1); 2642 break; 2643 case OPLT: 2644 cp->ci = (k == -1); 2645 break; 2646 case OPGE: 2647 cp->ci = (k >= 0); 2648 break; 2649 case OPLE: 2650 cp->ci = (k <= 0); 2651 break; 2652 default: 2653 badop ("consbinop", opcode); 2654 } 2655 break; 2656 } 2657 } 2658 2659 2660 2661 2662 conssgn(p) 2663 register expptr p; 2664 { 2665 if( ! ISCONST(p) ) 2666 fatal( "sgn(nonconstant)" ); 2667 2668 switch(p->headblock.vtype) 2669 { 2670 case TYSHORT: 2671 case TYLONG: 2672 if(p->constblock.const.ci > 0) return(1); 2673 if(p->constblock.const.ci < 0) return(-1); 2674 return(0); 2675 2676 case TYREAL: 2677 case TYDREAL: 2678 if(p->constblock.const.cd[0] > 0) return(1); 2679 if(p->constblock.const.cd[0] < 0) return(-1); 2680 return(0); 2681 2682 case TYCOMPLEX: 2683 case TYDCOMPLEX: 2684 return(p->constblock.const.cd[0]!=0 || p->constblock.const.cd[1]!=0); 2685 2686 default: 2687 badtype( "conssgn", p->constblock.vtype); 2688 } 2689 /* NOTREACHED */ 2690 } 2691 2692 char *powint[ ] = { "pow_ii", "pow_ri", "pow_di", "pow_ci", "pow_zi" }; 2693 2694 2695 LOCAL expptr mkpower(p) 2696 register expptr p; 2697 { 2698 register expptr q, lp, rp; 2699 int ltype, rtype, mtype; 2700 2701 lp = p->exprblock.leftp; 2702 rp = p->exprblock.rightp; 2703 ltype = lp->headblock.vtype; 2704 rtype = rp->headblock.vtype; 2705 2706 if(ISICON(rp)) 2707 { 2708 if(rp->constblock.const.ci == 0) 2709 { 2710 frexpr(p); 2711 if( ISINT(ltype) ) 2712 return( ICON(1) ); 2713 else 2714 { 2715 expptr pp; 2716 pp = mkconv(ltype, ICON(1)); 2717 return( pp ); 2718 } 2719 } 2720 if(rp->constblock.const.ci < 0) 2721 { 2722 if( ISINT(ltype) ) 2723 { 2724 frexpr(p); 2725 err("integer**negative"); 2726 return( errnode() ); 2727 } 2728 rp->constblock.const.ci = - rp->constblock.const.ci; 2729 p->exprblock.leftp = lp = fixexpr(mkexpr(OPSLASH, ICON(1), lp)); 2730 } 2731 if(rp->constblock.const.ci == 1) 2732 { 2733 frexpr(rp); 2734 free( (charptr) p ); 2735 return(lp); 2736 } 2737 2738 if( ONEOF(ltype, MSKINT|MSKREAL) ) 2739 { 2740 p->exprblock.vtype = ltype; 2741 return(p); 2742 } 2743 } 2744 if( ISINT(rtype) ) 2745 { 2746 if(ltype==TYSHORT && rtype==TYSHORT && (!ISCONST(lp) || tyint==TYSHORT) ) 2747 q = call2(TYSHORT, "pow_hh", lp, rp); 2748 else { 2749 if(ltype == TYSHORT) 2750 { 2751 ltype = TYLONG; 2752 lp = mkconv(TYLONG,lp); 2753 } 2754 q = call2(ltype, powint[ltype-TYLONG], lp, mkconv(TYLONG, rp)); 2755 } 2756 } 2757 else if( ISREAL( (mtype = maxtype(ltype,rtype)) )) 2758 q = call2(mtype, "pow_dd", mkconv(TYDREAL,lp), mkconv(TYDREAL,rp)); 2759 else { 2760 q = call2(TYDCOMPLEX, "pow_zz", 2761 mkconv(TYDCOMPLEX,lp), mkconv(TYDCOMPLEX,rp)); 2762 if(mtype == TYCOMPLEX) 2763 q = mkconv(TYCOMPLEX, q); 2764 } 2765 free( (charptr) p ); 2766 return(q); 2767 } 2768 2769 2770 2771 /* Complex Division. Same code as in Runtime Library 2772 */ 2773 2774 struct dcomplex { double dreal, dimag; }; 2775 2776 2777 LOCAL zdiv(c, a, b) 2778 register struct dcomplex *a, *b, *c; 2779 { 2780 double ratio, den; 2781 double abr, abi; 2782 2783 if( (abr = b->dreal) < 0.) 2784 abr = - abr; 2785 if( (abi = b->dimag) < 0.) 2786 abi = - abi; 2787 if( abr <= abi ) 2788 { 2789 if(abi == 0) 2790 fatal("complex division by zero"); 2791 ratio = b->dreal / b->dimag ; 2792 den = b->dimag * (1 + ratio*ratio); 2793 c->dreal = (a->dreal*ratio + a->dimag) / den; 2794 c->dimag = (a->dimag*ratio - a->dreal) / den; 2795 } 2796 2797 else 2798 { 2799 ratio = b->dimag / b->dreal ; 2800 den = b->dreal * (1 + ratio*ratio); 2801 c->dreal = (a->dreal + a->dimag*ratio) / den; 2802 c->dimag = (a->dimag - a->dreal*ratio) / den; 2803 } 2804 2805 } 2806 2807 expptr oftwo(e) 2808 expptr e; 2809 { 2810 int val,res; 2811 2812 if (! ISCONST (e)) 2813 return (0); 2814 2815 val = e->constblock.const.ci; 2816 switch (val) 2817 { 2818 case 2: res = 1; break; 2819 case 4: res = 2; break; 2820 case 8: res = 3; break; 2821 case 16: res = 4; break; 2822 case 32: res = 5; break; 2823 case 64: res = 6; break; 2824 case 128: res = 7; break; 2825 case 256: res = 8; break; 2826 default: return (0); 2827 } 2828 return (ICON (res)); 2829 } 2830