| 1 | /* |
| 2 | * Copyright (c) 1982 Regents of the University of California |
| 3 | */ |
| 4 | #ifndef lint |
| 5 | static char sccsid[] = "@(#)asparse.c 4.11 %G%"; |
| 6 | #endif not lint |
| 7 | |
| 8 | #include <stdio.h> |
| 9 | #include "as.h" |
| 10 | #include "asscan.h" |
| 11 | #include "assyms.h" |
| 12 | #include "asexpr.h" |
| 13 | |
| 14 | int lgensym[10]; |
| 15 | char genref[10]; |
| 16 | |
| 17 | long bitfield; |
| 18 | int bitoff; |
| 19 | int curlen; /* current length of literals */ |
| 20 | |
| 21 | /* |
| 22 | * The following three variables are communication between various |
| 23 | * modules to special case a number of things. They are properly |
| 24 | * categorized as hacks. |
| 25 | */ |
| 26 | extern struct symtab *lastnam;/*last name seen by the lexical analyzer*/ |
| 27 | int exprisname; /*last factor in an expression was a name*/ |
| 28 | int droppedLP; /*one is analyzing an expression beginning with*/ |
| 29 | /*a left parenthesis, which has already been*/ |
| 30 | /*shifted. (Used to parse (<expr>)(rn)*/ |
| 31 | |
| 32 | char yytext[NCPS+2]; /*the lexical image*/ |
| 33 | int yylval; /*the lexical value; sloppy typing*/ |
| 34 | struct Opcode yyopcode; /* lexical value for an opcode */ |
| 35 | Bignum yybignum; /* lexical value for a big number */ |
| 36 | /* |
| 37 | * Expression and argument managers |
| 38 | */ |
| 39 | struct exp *xp; /*next free expression slot, used by expr.c*/ |
| 40 | struct exp explist[NEXP]; /*max of 20 expressions in one opcode*/ |
| 41 | struct arg arglist[NARG]; /*building up operands in instructions*/ |
| 42 | /* |
| 43 | * Sets to accelerate token discrimination |
| 44 | */ |
| 45 | char tokensets[(LASTTOKEN) - (FIRSTTOKEN) + 1]; |
| 46 | |
| 47 | static char UDotsname[32]; /*name of the assembly source*/ |
| 48 | |
| 49 | yyparse() |
| 50 | { |
| 51 | reg struct exp *locxp; |
| 52 | /* |
| 53 | * loc1xp and ptrloc1xp are used in the |
| 54 | * expression lookahead |
| 55 | */ |
| 56 | struct exp *loc1xp; /*must be non register*/ |
| 57 | struct exp **ptrloc1xp = & loc1xp; |
| 58 | struct exp *pval; /*hacking expr:expr*/ |
| 59 | |
| 60 | reg struct symtab *np; |
| 61 | reg int argcnt; |
| 62 | |
| 63 | reg inttoktype val; /*what yylex gives*/ |
| 64 | reg inttoktype auxval; /*saves val*/ |
| 65 | |
| 66 | reg struct arg *ap; /*first free argument*/ |
| 67 | |
| 68 | reg struct symtab *p; |
| 69 | reg struct symtab *stpt; |
| 70 | |
| 71 | struct strdesc *stringp; /*handles string lists*/ |
| 72 | |
| 73 | int regno; /*handles arguments*/ |
| 74 | int *ptrregno = ®no; |
| 75 | int sawmul; /*saw * */ |
| 76 | int sawindex; /*saw [rn]*/ |
| 77 | int sawsize; |
| 78 | int seg_type; /*the kind of segment: data or text*/ |
| 79 | int seg_number; /*the segment number*/ |
| 80 | int space_value; /*how much .space needs*/ |
| 81 | int fill_rep; /*how many reps for .fill */ |
| 82 | int fill_size; /*how many bytes for .fill */ |
| 83 | |
| 84 | int field_width; /*how wide a field is to be*/ |
| 85 | int field_value; /*the value to stuff in a field*/ |
| 86 | char *stabname; /*name of stab dealing with*/ |
| 87 | ptrall stabstart; /*where the stab starts in the buffer*/ |
| 88 | int reloc_how; /* how to relocate expressions */ |
| 89 | int toconv; /* how to convert bignums */ |
| 90 | int incasetable; /* set if in a case table */ |
| 91 | |
| 92 | incasetable = 0; |
| 93 | xp = explist; |
| 94 | ap = arglist; |
| 95 | |
| 96 | val = yylex(); |
| 97 | |
| 98 | while (val != PARSEEOF){ /* primary loop */ |
| 99 | |
| 100 | while (INTOKSET(val, LINSTBEGIN)){ |
| 101 | if (val == INT) { |
| 102 | int i = ((struct exp *)yylval)->e_xvalue; |
| 103 | shift; |
| 104 | if (val != COLON){ |
| 105 | yyerror("Local label %d is not followed by a ':' for a label definition", |
| 106 | i); |
| 107 | goto errorfix; |
| 108 | } |
| 109 | if (i < 0 || i > 9) { |
| 110 | yyerror("Local labels are 0-9"); |
| 111 | goto errorfix; |
| 112 | } |
| 113 | (void)sprintf(yytext, "L%d\001%d", i, lgensym[i]); |
| 114 | lgensym[i]++; |
| 115 | genref[i] = 0; |
| 116 | yylval = (int)*lookup(passno == 1); |
| 117 | val = NAME; |
| 118 | np = (struct symtab *)yylval; |
| 119 | goto restlab; |
| 120 | } |
| 121 | if (val == NL){ |
| 122 | lineno++; |
| 123 | shift; |
| 124 | } else |
| 125 | if (val == SEMI) |
| 126 | shift; |
| 127 | else { /*its a name, so we have a label or def */ |
| 128 | if (val != NAME){ |
| 129 | ERROR("Name expected for a label"); |
| 130 | } |
| 131 | np = (struct symtab *)yylval; |
| 132 | shiftover(NAME); |
| 133 | if (val != COLON) { |
| 134 | #ifdef FLEXNAMES |
| 135 | yyerror("\"%s\" is not followed by a ':' for a label definition", |
| 136 | #else not FLEXNAMES |
| 137 | yyerror("\"%.*s\" is not followed by a ':' for a label definition", |
| 138 | NCPS, |
| 139 | #endif not FLEXNAMES |
| 140 | np->s_name); |
| 141 | goto errorfix; |
| 142 | } |
| 143 | restlab: |
| 144 | shift; |
| 145 | flushfield(NBPW/4); |
| 146 | if ((np->s_type&XTYPE)!=XUNDEF) { |
| 147 | if( (np->s_type&XTYPE)!=dotp->e_xtype |
| 148 | || np->s_value!=dotp->e_xvalue |
| 149 | || ( (passno==1) |
| 150 | &&(np->s_index != dotp->e_xloc) |
| 151 | ) |
| 152 | ){ |
| 153 | #ifndef DEBUG |
| 154 | if (np->s_name[0] != 'L') |
| 155 | #endif not DEBUG |
| 156 | { |
| 157 | if (passno == 1) |
| 158 | #ifdef FLEXNAMES |
| 159 | yyerror("%s redefined", |
| 160 | #else not FLEXNAMES |
| 161 | yyerror("%.*s redefined", |
| 162 | NCPS, |
| 163 | #endif not FLEXNAMES |
| 164 | np->s_name); |
| 165 | else |
| 166 | #ifdef FLEXNAMES |
| 167 | yyerror("%s redefined: PHASE ERROR, 1st: %d, 2nd: %d", |
| 168 | #else not FLEXNAMES |
| 169 | yyerror("%.*s redefined: PHASE ERROR, 1st: %d, 2nd: %d", |
| 170 | NCPS, |
| 171 | #endif not FLEXNAMES |
| 172 | np->s_name, |
| 173 | np->s_value, |
| 174 | dotp->e_xvalue); |
| 175 | } |
| 176 | } |
| 177 | } |
| 178 | np->s_type &= ~(XTYPE|XFORW); |
| 179 | np->s_type |= dotp->e_xtype; |
| 180 | np->s_value = dotp->e_xvalue; |
| 181 | if (passno == 1){ |
| 182 | np->s_index = dotp-usedot; |
| 183 | if (np->s_name[0] == 'L'){ |
| 184 | nlabels++; |
| 185 | } |
| 186 | np->s_tag = LABELID; |
| 187 | } |
| 188 | } /*end of this being a label*/ |
| 189 | } /*end of to consuming all labels, NLs and SEMIS */ |
| 190 | |
| 191 | xp = explist; |
| 192 | ap = arglist; |
| 193 | |
| 194 | /* |
| 195 | * process the INSTRUCTION body |
| 196 | */ |
| 197 | switch(val){ |
| 198 | |
| 199 | default: |
| 200 | ERROR("Unrecognized instruction or directive"); |
| 201 | |
| 202 | case IABORT: |
| 203 | shift; |
| 204 | sawabort(); |
| 205 | /*NOTREACHED*/ |
| 206 | break; |
| 207 | |
| 208 | case PARSEEOF: |
| 209 | tokptr -= sizeof(bytetoktype); |
| 210 | *tokptr++ = VOID; |
| 211 | tokptr[1] = VOID; |
| 212 | tokptr[2] = PARSEEOF; |
| 213 | break; |
| 214 | |
| 215 | case IFILE: |
| 216 | shift; |
| 217 | stringp = (struct strdesc *)yylval; |
| 218 | shiftover(STRING); |
| 219 | dotsname = &UDotsname[0]; |
| 220 | movestr(dotsname, stringp->str, |
| 221 | stringp->str_lg >= 32? 32 :stringp->str_lg); |
| 222 | dotsname[stringp->str_lg] = '\0'; |
| 223 | break; |
| 224 | |
| 225 | case ILINENO: |
| 226 | shift; /*over the ILINENO*/ |
| 227 | expr(locxp, val); |
| 228 | lineno = locxp->e_xvalue; |
| 229 | break; |
| 230 | |
| 231 | case ISET: /* .set <name> , <expr> */ |
| 232 | shift; |
| 233 | np = (struct symtab *)yylval; |
| 234 | shiftover(NAME); |
| 235 | shiftover(CM); |
| 236 | expr(locxp, val); |
| 237 | np->s_type &= (XXTRN|XFORW); |
| 238 | np->s_type |= locxp->e_xtype&(XTYPE|XFORW); |
| 239 | np->s_value = locxp->e_xvalue; |
| 240 | if (passno==1) |
| 241 | np->s_index = locxp->e_xloc; |
| 242 | if ((locxp->e_xtype&XTYPE) == XUNDEF) |
| 243 | yyerror("Illegal set?"); |
| 244 | break; |
| 245 | |
| 246 | case ILSYM: /*.lsym name , expr */ |
| 247 | shift; |
| 248 | np = (struct symtab *)yylval; |
| 249 | shiftover(NAME); |
| 250 | shiftover(CM); |
| 251 | expr(locxp, val); |
| 252 | /* |
| 253 | * Build the unique occurance of the |
| 254 | * symbol. |
| 255 | * The character scanner will have |
| 256 | * already entered it into the symbol |
| 257 | * table, but we should remove it |
| 258 | */ |
| 259 | if (passno == 1){ |
| 260 | stpt = (struct symtab *)symalloc(); |
| 261 | #ifdef FLEXNAMES |
| 262 | stpt->s_name = np->s_name; |
| 263 | #else |
| 264 | movestr(stpt->s_name, np->s_name, NCPS); |
| 265 | #endif |
| 266 | np->s_tag = OBSOLETE; /*invalidate original */ |
| 267 | nforgotten++; |
| 268 | np = stpt; |
| 269 | if ( (locxp->e_xtype & XTYPE) != XABS) |
| 270 | yyerror("Illegal second argument to lsym"); |
| 271 | np->s_value = locxp->e_xvalue; |
| 272 | np->s_type = XABS; |
| 273 | np->s_tag = ILSYM; |
| 274 | } |
| 275 | break; |
| 276 | |
| 277 | case IGLOBAL: /*.globl <name> */ |
| 278 | shift; |
| 279 | np = (struct symtab *)yylval; |
| 280 | shiftover(NAME); |
| 281 | np->s_type |= XXTRN; |
| 282 | break; |
| 283 | |
| 284 | case IDATA: /*.data [ <expr> ] */ |
| 285 | case ITEXT: /*.text [ <expr> ] */ |
| 286 | seg_type = -val; |
| 287 | shift; |
| 288 | if (INTOKSET(val, EBEGOPS+YUKKYEXPRBEG+SAFEEXPRBEG)){ |
| 289 | expr(locxp, val); |
| 290 | seg_type = -seg_type; /*now, it is positive*/ |
| 291 | } |
| 292 | |
| 293 | if (seg_type < 0) { /*there wasn't an associated expr*/ |
| 294 | seg_number = 0; |
| 295 | seg_type = -seg_type; |
| 296 | } else { |
| 297 | if ( ((locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 298 | || (seg_number = locxp->e_xvalue) >= NLOC) { |
| 299 | yyerror("illegal location counter"); |
| 300 | seg_number = 0; |
| 301 | } |
| 302 | } |
| 303 | if (seg_type == IDATA) |
| 304 | seg_number += NLOC; |
| 305 | flushfield(NBPW/4); |
| 306 | dotp = &usedot[seg_number]; |
| 307 | #ifdef UNIX |
| 308 | if (passno==2) { /* go salt away in pass 2*/ |
| 309 | txtfil = usefile[seg_number]; |
| 310 | relfil = rusefile[seg_number]; |
| 311 | } |
| 312 | #endif UNIX |
| 313 | #ifdef VMS |
| 314 | if (passno==2) { |
| 315 | puchar(vms_obj_ptr,6); /* setpl */ |
| 316 | puchar(vms_obj_ptr,seg_number); /* psect # */ |
| 317 | plong(vms_obj_ptr,dotp->e_xvalue);/* offset */ |
| 318 | puchar(vms_obj_ptr,80); /* setrb */ |
| 319 | if((vms_obj_ptr-sobuf) > 400){ |
| 320 | write(objfil,sobuf,vms_obj_ptr-sobuf); |
| 321 | vms_obj_ptr=sobuf+1; /*flush buf*/ |
| 322 | } |
| 323 | } |
| 324 | #endif VMS |
| 325 | break; |
| 326 | |
| 327 | /* |
| 328 | * Storage filler directives: |
| 329 | * |
| 330 | * .byte [<exprlist>] |
| 331 | * |
| 332 | * exprlist: empty | exprlist outexpr |
| 333 | * outexpr: <expr> | <expr> : <expr> |
| 334 | */ |
| 335 | case IBYTE: curlen = NBPW/4; goto elist; |
| 336 | case IWORD: curlen = NBPW/2; goto elist; |
| 337 | case IINT: curlen = NBPW; goto elist; |
| 338 | case ILONG: curlen = NBPW; goto elist; |
| 339 | |
| 340 | elist: |
| 341 | seg_type = val; |
| 342 | shift; |
| 343 | |
| 344 | /* |
| 345 | * Expression List processing |
| 346 | */ |
| 347 | if (INTOKSET(val, EBEGOPS+YUKKYEXPRBEG+SAFEEXPRBEG)){ |
| 348 | do{ |
| 349 | /* |
| 350 | * expression list consists of a list of : |
| 351 | * <expr> |
| 352 | * <expr> : <expr> |
| 353 | * (pack expr2 into expr1 bits |
| 354 | */ |
| 355 | expr(locxp, val); |
| 356 | /* |
| 357 | * now, pointing at the next token |
| 358 | */ |
| 359 | if (val == COLON){ |
| 360 | shiftover(COLON); |
| 361 | expr(pval, val); |
| 362 | if ((locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 363 | yyerror("Width not absolute"); |
| 364 | field_width = locxp->e_xvalue; |
| 365 | locxp = pval; |
| 366 | if (bitoff + field_width > curlen) |
| 367 | flushfield(curlen); |
| 368 | if (field_width > curlen) |
| 369 | yyerror("Expression crosses field boundary"); |
| 370 | } else { |
| 371 | field_width = curlen; |
| 372 | flushfield(curlen); |
| 373 | } |
| 374 | |
| 375 | if ((locxp->e_xtype & XTYPE) != XABS) { |
| 376 | if (bitoff) |
| 377 | yyerror("Illegal relocation in field"); |
| 378 | switch(curlen){ |
| 379 | case NBPW/4: reloc_how = TYPB; break; |
| 380 | case NBPW/2: reloc_how = TYPW; break; |
| 381 | case NBPW: reloc_how = TYPL; break; |
| 382 | } |
| 383 | if (passno == 1){ |
| 384 | dotp->e_xvalue += ty_nbyte[reloc_how]; |
| 385 | } else { |
| 386 | outrel(locxp, reloc_how); |
| 387 | } |
| 388 | } else { |
| 389 | /* |
| 390 | * |
| 391 | * See if we are doing a case instruction. |
| 392 | * If so, then see if the branch distance, |
| 393 | * stored as a word, |
| 394 | * is going to loose sig bits. |
| 395 | */ |
| 396 | if (passno == 2 && incasetable){ |
| 397 | if ( (locxp->e_xvalue < -32768) |
| 398 | ||(locxp->e_xvalue > 32767)){ |
| 399 | yyerror("Case will branch too far"); |
| 400 | } |
| 401 | } |
| 402 | field_value = locxp->e_xvalue & ( (1L << field_width)-1); |
| 403 | bitfield |= field_value << bitoff; |
| 404 | bitoff += field_width; |
| 405 | } |
| 406 | xp = explist; |
| 407 | if (auxval = (val == CM)) |
| 408 | shift; |
| 409 | } while (auxval); |
| 410 | } /* there existed an expression at all */ |
| 411 | |
| 412 | flushfield(curlen); |
| 413 | if ( ( curlen == NBPW/4) && bitoff) |
| 414 | dotp->e_xvalue ++; |
| 415 | break; |
| 416 | /*end of case IBYTE, IWORD, ILONG, IINT*/ |
| 417 | |
| 418 | case ISPACE: /* .space <expr> */ |
| 419 | shift; |
| 420 | expr(locxp, val); |
| 421 | if ((locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 422 | yyerror("Space size not absolute"); |
| 423 | space_value = locxp->e_xvalue; |
| 424 | ospace: |
| 425 | flushfield(NBPW/4); |
| 426 | #ifdef UNIX |
| 427 | while (space_value > 96){ |
| 428 | outs(strbuf[2].str, 96); |
| 429 | space_value -= 96; |
| 430 | } |
| 431 | outs(strbuf[2].str, space_value); |
| 432 | #endif UNIX |
| 433 | #ifdef VMS |
| 434 | dotp->e_xvalue += space_value; /*bump pc*/ |
| 435 | if (passno==2){ |
| 436 | if(*(strbuf[2].str)==0) { |
| 437 | puchar(vms_obj_ptr,81); /* AUGR */ |
| 438 | pulong(vms_obj_ptr,space_value);/* incr */ |
| 439 | } else yyerror("VMS, encountered non-0 .space"); |
| 440 | if ((vms_obj_ptr-sobuf) > 400) { |
| 441 | write(objfil,sobuf,vms_obj_ptr-sobuf); |
| 442 | vms_obj_ptr=sobuf+1; /*pur buf*/ |
| 443 | } |
| 444 | } |
| 445 | #endif VMS |
| 446 | break; |
| 447 | |
| 448 | #ifdef UNIX |
| 449 | /* |
| 450 | * .fill rep, size, value |
| 451 | * repeat rep times: fill size bytes with (truncated) value |
| 452 | * size must be between 1 and 8 |
| 453 | */ |
| 454 | case IFILL: |
| 455 | shift; |
| 456 | expr(locxp, val); |
| 457 | if ( (locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 458 | yyerror("Fill repetition count not absolute"); |
| 459 | fill_rep = locxp->e_xvalue; |
| 460 | shiftover(CM); |
| 461 | expr(locxp, val); |
| 462 | if ( (locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 463 | yyerror("Fill size not absolute"); |
| 464 | fill_size = locxp->e_xvalue; |
| 465 | if (fill_size <= 0 || fill_size > 8) |
| 466 | yyerror("Fill count not in in 1..8"); |
| 467 | shiftover(CM); |
| 468 | expr(locxp, val); |
| 469 | if (passno == 2 && (locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 470 | yyerror("Fill value not absolute"); |
| 471 | flushfield(NBPW/4); |
| 472 | if (passno == 1) { |
| 473 | dotp->e_xvalue += fill_rep * fill_size; |
| 474 | } else { |
| 475 | while(fill_rep-- > 0) |
| 476 | bwrite((char *)&locxp->e_xvalue, fill_size, txtfil); |
| 477 | } |
| 478 | break; |
| 479 | #endif UNIX |
| 480 | |
| 481 | case IASCII: /* .ascii [ <stringlist> ] */ |
| 482 | case IASCIZ: /* .asciz [ <stringlist> ] */ |
| 483 | auxval = val; |
| 484 | shift; |
| 485 | |
| 486 | /* |
| 487 | * Code to consume a string list |
| 488 | * |
| 489 | * stringlist: empty | STRING | stringlist STRING |
| 490 | */ |
| 491 | while (val == STRING){ |
| 492 | flushfield(NBPW/4); |
| 493 | if (bitoff) |
| 494 | dotp->e_xvalue++; |
| 495 | stringp = (struct strdesc *)yylval; |
| 496 | #ifdef UNIX |
| 497 | outs(stringp->str, stringp->str_lg); |
| 498 | #endif UNIX |
| 499 | #ifdef VMS |
| 500 | { |
| 501 | reg int i; |
| 502 | for (i=0; i < stringp->str_lg; i++){ |
| 503 | dotp->e_xvalue += 1; |
| 504 | if (passno==2){ |
| 505 | puchar(vms_obj_ptr,-1); |
| 506 | puchar(vms_obj_ptr,stringp->str[i]); |
| 507 | if (vms_obj_ptr-sobuf > 400) { |
| 508 | write(objfil,sobuf,vms_obj_ptr-sobuf); |
| 509 | vms_obj_ptr = sobuf + 1; |
| 510 | } |
| 511 | } |
| 512 | } |
| 513 | } |
| 514 | #endif VMS |
| 515 | shift; /*over the STRING*/ |
| 516 | if (val == CM) /*could be a split string*/ |
| 517 | shift; |
| 518 | } |
| 519 | |
| 520 | if (auxval == IASCIZ){ |
| 521 | flushfield(NBPW/4); |
| 522 | #ifdef UNIX |
| 523 | outb(0); |
| 524 | #endif UNIX |
| 525 | #ifdef VMS |
| 526 | if (passno == 2) { |
| 527 | puchar(vms_obj_ptr,-1); |
| 528 | puchar(vms_obj_ptr,0); |
| 529 | } |
| 530 | dotp->e_xvalue += 1; |
| 531 | #endif VMS |
| 532 | } |
| 533 | break; |
| 534 | |
| 535 | case IORG: /* .org <expr> */ |
| 536 | shift; |
| 537 | expr(locxp, val); |
| 538 | |
| 539 | if ((locxp->e_xtype & XTYPE) == XABS) /* tekmdp */ |
| 540 | orgwarn++; |
| 541 | else if ((locxp->e_xtype & ~XXTRN) != dotp->e_xtype) |
| 542 | yyerror("Illegal expression to set origin"); |
| 543 | space_value = locxp->e_xvalue - dotp->e_xvalue; |
| 544 | if (space_value < 0) |
| 545 | yyerror("Backwards 'org'"); |
| 546 | goto ospace; |
| 547 | break; |
| 548 | |
| 549 | /* |
| 550 | * |
| 551 | * Process stabs. Stabs are created only by the f77 |
| 552 | * and the C compiler with the -g flag set. |
| 553 | * We only look at the stab ONCE, during pass 1, and |
| 554 | * virtually remove the stab from the intermediate file |
| 555 | * so it isn't seen during pass2. This makes for some |
| 556 | * hairy processing to handle labels occuring in |
| 557 | * stab entries, but since most expressions in the |
| 558 | * stab are integral we save lots of time in the second |
| 559 | * pass by not looking at the stabs. |
| 560 | * A stab that is tagged floating will be bumped during |
| 561 | * the jxxx resolution phase. A stab tagged fixed will |
| 562 | * not be be bumped. |
| 563 | * |
| 564 | * .stab: Old fashioned stabs |
| 565 | * .stabn: For stabs without names |
| 566 | * .stabs: For stabs with string names |
| 567 | * .stabd: For stabs for line numbers or bracketing, |
| 568 | * without a string name, without |
| 569 | * a final expression. The value of the |
| 570 | * final expression is taken to be the current |
| 571 | * location counter, and is patched by the 2nd pass |
| 572 | * |
| 573 | * .stab{<expr>,}*NCPS,<expr>, <expr>, <expr>, <expr> |
| 574 | * .stabn <expr>, <expr>, <expr>, <expr> |
| 575 | * .stabs STRING, <expr>, <expr>, <expr>, <expr> |
| 576 | * .stabd <expr>, <expr>, <expr> # . |
| 577 | */ |
| 578 | case ISTAB: |
| 579 | #ifndef FLEXNAMES |
| 580 | stabname = ".stab"; |
| 581 | if (passno == 2) goto errorfix; |
| 582 | stpt = (struct symtab *)yylval; |
| 583 | /* |
| 584 | * Make a pointer to the .stab slot. |
| 585 | * There is a pointer in the way (stpt), and |
| 586 | * tokptr points to the next token. |
| 587 | */ |
| 588 | stabstart = tokptr; |
| 589 | (char *)stabstart -= sizeof(struct symtab *); |
| 590 | (char *)stabstart -= sizeof(bytetoktype); |
| 591 | shift; |
| 592 | for (argcnt = 0; argcnt < NCPS; argcnt++){ |
| 593 | expr(locxp, val); |
| 594 | stpt->s_name[argcnt] = locxp->e_xvalue; |
| 595 | xp = explist; |
| 596 | shiftover(CM); |
| 597 | } |
| 598 | goto tailstab; |
| 599 | #else FLEXNAMES |
| 600 | yyerror(".stab directive not supported in; report this compiler bug to system administrator"); |
| 601 | goto errorfix; |
| 602 | #endif FLEXNAMES |
| 603 | |
| 604 | tailstab: |
| 605 | expr(locxp, val); |
| 606 | if (! (locxp->e_xvalue & STABTYPS)){ |
| 607 | yyerror("Invalid type in %s", stabname); |
| 608 | goto errorfix; |
| 609 | } |
| 610 | stpt->s_ptype = locxp->e_xvalue; |
| 611 | shiftover(CM); |
| 612 | expr(locxp, val); |
| 613 | stpt->s_other = locxp->e_xvalue; |
| 614 | shiftover(CM); |
| 615 | expr(locxp, val); |
| 616 | stpt->s_desc = locxp->e_xvalue; |
| 617 | shiftover(CM); |
| 618 | exprisname = 0; |
| 619 | expr(locxp, val); |
| 620 | p = locxp->e_xname; |
| 621 | if (p == NULL) { /*absolute expr to begin with*/ |
| 622 | stpt->s_value = locxp->e_xvalue; |
| 623 | stpt->s_index = dotp - usedot; |
| 624 | if (exprisname){ |
| 625 | switch(stpt->s_ptype){ |
| 626 | case N_GSYM: |
| 627 | case N_FNAME: |
| 628 | case N_RSYM: |
| 629 | case N_SSYM: |
| 630 | case N_LSYM: |
| 631 | case N_PSYM: |
| 632 | case N_BCOMM: |
| 633 | case N_ECOMM: |
| 634 | case N_LENG: |
| 635 | stpt->s_tag = STABFIXED; |
| 636 | break; |
| 637 | default: |
| 638 | stpt->s_tag = STABFLOATING; |
| 639 | break; |
| 640 | } |
| 641 | } else |
| 642 | stpt->s_tag = STABFIXED; |
| 643 | } |
| 644 | else { /*really have a name*/ |
| 645 | stpt->s_dest = locxp->e_xname; |
| 646 | stpt->s_index = p->s_index; |
| 647 | stpt->s_type = p->s_type | STABFLAG; |
| 648 | /* |
| 649 | * We will assign a more accruate |
| 650 | * guess of locxp's location when |
| 651 | * we sort the symbol table |
| 652 | * The final value of value is |
| 653 | * given by stabfix() |
| 654 | */ |
| 655 | /* |
| 656 | * For exprs of the form (name + value) one needs to remember locxp->e_xvalue |
| 657 | * for use in stabfix. The right place to keep this is in stpt->s_value |
| 658 | * however this gets corrupted at an unknown point. |
| 659 | * As a bandaid hack the value is preserved in s_desc and s_other (a |
| 660 | * short and a char). This destroys these two values and will |
| 661 | * be fixed. May 19 ,1983 Alastair Fyfe |
| 662 | */ |
| 663 | if(locxp->e_xvalue) { |
| 664 | stpt->s_other = (locxp->e_xvalue >> 16); |
| 665 | stpt->s_desc = (locxp->e_xvalue & 0x0000ffff); |
| 666 | stpt->s_tag = STABFLOATING; |
| 667 | } |
| 668 | } |
| 669 | /* |
| 670 | * tokptr now points at one token beyond |
| 671 | * the current token stored in val and yylval, |
| 672 | * which are the next tokens after the end of |
| 673 | * this .stab directive. This next token must |
| 674 | * be either a SEMI or NL, so is of width just |
| 675 | * one. Therefore, to point to the next token |
| 676 | * after the end of this stab, just back up one.. |
| 677 | */ |
| 678 | buildskip(stabstart, (bytetoktype *)tokptr - sizeof(bytetoktype)); |
| 679 | break; /*end of the .stab*/ |
| 680 | |
| 681 | case ISTABDOT: |
| 682 | stabname = ".stabd"; |
| 683 | stpt = (struct symtab *)yylval; |
| 684 | /* |
| 685 | * We clobber everything after the |
| 686 | * .stabd and its pointer... we MUST |
| 687 | * be able to get back to this .stabd |
| 688 | * so that we can resolve its final value |
| 689 | */ |
| 690 | stabstart = tokptr; |
| 691 | shift; /*over the ISTABDOT*/ |
| 692 | if (passno == 1){ |
| 693 | expr(locxp, val); |
| 694 | if (! (locxp->e_xvalue & STABTYPS)){ |
| 695 | yyerror("Invalid type in .stabd"); |
| 696 | goto errorfix; |
| 697 | } |
| 698 | stpt->s_ptype = locxp->e_xvalue; |
| 699 | shiftover(CM); |
| 700 | expr(locxp, val); |
| 701 | stpt->s_other = locxp->e_xvalue; |
| 702 | shiftover(CM); |
| 703 | expr(locxp, val); |
| 704 | stpt->s_desc = locxp->e_xvalue; |
| 705 | /* |
| 706 | * |
| 707 | * Now, clobber everything but the |
| 708 | * .stabd pseudo and the pointer |
| 709 | * to its symbol table entry |
| 710 | * tokptr points to the next token, |
| 711 | * build the skip up to this |
| 712 | */ |
| 713 | buildskip(stabstart, (bytetoktype *)tokptr - sizeof(bytetoktype)); |
| 714 | } |
| 715 | /* |
| 716 | * pass 1: Assign a good guess for its position |
| 717 | * (ensures they are sorted into right place)/ |
| 718 | * pass 2: Fix the actual value |
| 719 | */ |
| 720 | stpt->s_value = dotp->e_xvalue; |
| 721 | stpt->s_index = dotp - usedot; |
| 722 | stpt->s_tag = STABFLOATING; /*although it has no effect in pass 2*/ |
| 723 | break; |
| 724 | |
| 725 | case ISTABNONE: stabname = ".stabn"; goto shortstab; |
| 726 | |
| 727 | case ISTABSTR: stabname = ".stabs"; |
| 728 | shortstab: |
| 729 | auxval = val; |
| 730 | if (passno == 2) goto errorfix; |
| 731 | stpt = (struct symtab *)yylval; |
| 732 | stabstart = tokptr; |
| 733 | (bytetoktype *)stabstart -= sizeof(struct symtab *); |
| 734 | (bytetoktype *)stabstart -= sizeof(bytetoktype); |
| 735 | shift; |
| 736 | if (auxval == ISTABSTR){ |
| 737 | stringp = (struct strdesc *)yylval; |
| 738 | shiftover(STRING); |
| 739 | #ifndef FLEXNAMES |
| 740 | auxval = stringp->str_lg > NCPS ? NCPS : stringp->str_lg; |
| 741 | #else |
| 742 | stringp->str[stringp->str_lg] = 0; |
| 743 | #endif |
| 744 | shiftover(CM); |
| 745 | } else { |
| 746 | stringp = &(strbuf[2]); |
| 747 | #ifndef FLEXNAMES |
| 748 | auxval = NCPS; |
| 749 | #endif |
| 750 | } |
| 751 | #ifndef FLEXNAMES |
| 752 | movestr(stpt->s_name, stringp->str, auxval); |
| 753 | #else |
| 754 | stpt->s_name = savestr(stringp->str); |
| 755 | #endif |
| 756 | goto tailstab; |
| 757 | break; |
| 758 | |
| 759 | case ICOMM: /* .comm <name> , <expr> */ |
| 760 | case ILCOMM: /* .lcomm <name> , <expr> */ |
| 761 | auxval = val; |
| 762 | shift; |
| 763 | np = (struct symtab *)yylval; |
| 764 | shiftover(NAME); |
| 765 | shiftover(CM); |
| 766 | expr(locxp, val); |
| 767 | |
| 768 | if ( (locxp->e_xtype & XTYPE) != XABS) /* tekmdp */ |
| 769 | yyerror("comm size not absolute"); |
| 770 | if (passno == 1 && (np->s_type&XTYPE) != XUNDEF) |
| 771 | #ifdef FLEXNAMES |
| 772 | yyerror("Redefinition of %s", |
| 773 | #else not FLEXNAMES |
| 774 | yyerror("Redefinition of %.*s", |
| 775 | NCPS, |
| 776 | #endif not FLEXNAMES |
| 777 | np->s_name); |
| 778 | if (passno==1) { |
| 779 | np->s_value = locxp->e_xvalue; |
| 780 | if (auxval == ICOMM) |
| 781 | np->s_type |= XXTRN; |
| 782 | else { |
| 783 | np->s_type &= ~XTYPE; |
| 784 | np->s_type |= XBSS; |
| 785 | } |
| 786 | } |
| 787 | break; |
| 788 | |
| 789 | case IALIGN: /* .align <expr> */ |
| 790 | stpt = (struct symtab *)yylval; |
| 791 | shift; |
| 792 | expr(locxp, val); |
| 793 | jalign(locxp, stpt); |
| 794 | break; |
| 795 | |
| 796 | case INST0: /* instructions w/o arguments*/ |
| 797 | incasetable = 0; |
| 798 | insout(yyopcode, (struct arg *)0, 0); |
| 799 | shift; |
| 800 | break; |
| 801 | |
| 802 | case INSTn: /* instructions with arguments*/ |
| 803 | case IJXXX: /* UNIX style jump instructions */ |
| 804 | auxval = val; |
| 805 | /* |
| 806 | * Code to process an argument list |
| 807 | */ |
| 808 | ap = arglist; |
| 809 | xp = explist; |
| 810 | |
| 811 | shift; /* bring in the first token for the arg list*/ |
| 812 | |
| 813 | for (argcnt = 1; argcnt <= 6; argcnt++, ap++){ |
| 814 | /* |
| 815 | * code to process an argument proper |
| 816 | */ |
| 817 | sawindex = sawmul = sawsize = 0; |
| 818 | { |
| 819 | switch(val) { |
| 820 | |
| 821 | default: |
| 822 | disp: |
| 823 | if( !(INTOKSET(val, |
| 824 | EBEGOPS |
| 825 | +YUKKYEXPRBEG |
| 826 | +SAFEEXPRBEG)) ) { |
| 827 | ERROR("expression expected"); |
| 828 | } |
| 829 | expr(ap->a_xp,val); |
| 830 | overdisp: |
| 831 | if ( val == LP || sawsize){ |
| 832 | shiftover(LP); |
| 833 | findreg(regno); |
| 834 | shiftover(RP); |
| 835 | ap->a_atype = ADISP; |
| 836 | ap->a_areg1 = regno; |
| 837 | } else { |
| 838 | ap->a_atype = AEXP; |
| 839 | ap->a_areg1 = 0; |
| 840 | } |
| 841 | goto index; |
| 842 | |
| 843 | case SIZESPEC: |
| 844 | sizespec: |
| 845 | sawsize = yylval; |
| 846 | shift; |
| 847 | goto disp; |
| 848 | |
| 849 | case REG: |
| 850 | case REGOP: |
| 851 | findreg(regno); |
| 852 | ap->a_atype = AREG; |
| 853 | ap->a_areg1 = regno; |
| 854 | break; |
| 855 | |
| 856 | case MUL: |
| 857 | sawmul = 1; |
| 858 | shift; |
| 859 | if (val == LP) goto base; |
| 860 | if (val == LITOP) goto imm; |
| 861 | if (val == SIZESPEC) goto sizespec; |
| 862 | if (INTOKSET(val, |
| 863 | EBEGOPS |
| 864 | +YUKKYEXPRBEG |
| 865 | +SAFEEXPRBEG)) goto disp; |
| 866 | ERROR("expression, '(' or '$' expected"); |
| 867 | break; |
| 868 | |
| 869 | case LP: |
| 870 | base: |
| 871 | shift; /*consume the LP*/ |
| 872 | /* |
| 873 | * hack the ambiguity of |
| 874 | * movl (expr) (rn), ... |
| 875 | * note that (expr) could also |
| 876 | * be (rn) (by special hole in the |
| 877 | * grammar), which we ensure |
| 878 | * means register indirection, instead |
| 879 | * of an expression with value n |
| 880 | */ |
| 881 | if (val != REG && val != REGOP){ |
| 882 | droppedLP = 1; |
| 883 | val = exprparse(val, &(ap->a_xp)); |
| 884 | droppedLP = 0; |
| 885 | goto overdisp; |
| 886 | } |
| 887 | findreg(regno); |
| 888 | shiftover(RP); |
| 889 | if (val == PLUS){ |
| 890 | shift; |
| 891 | ap->a_atype = AINCR; |
| 892 | } else |
| 893 | ap->a_atype = ABASE; |
| 894 | ap->a_areg1 = regno; |
| 895 | goto index; |
| 896 | |
| 897 | case LITOP: |
| 898 | imm: |
| 899 | shift; |
| 900 | expr(locxp, val); |
| 901 | ap->a_atype = AIMM; |
| 902 | ap->a_areg1 = 0; |
| 903 | ap->a_xp = locxp; |
| 904 | goto index; |
| 905 | |
| 906 | case MP: |
| 907 | shift; /* -(reg) */ |
| 908 | findreg(regno); |
| 909 | shiftover(RP); |
| 910 | ap->a_atype = ADECR; |
| 911 | ap->a_areg1 = regno; |
| 912 | index: /*look for [reg] */ |
| 913 | if (val == LB){ |
| 914 | shift; |
| 915 | findreg(regno); |
| 916 | shiftover(RB); |
| 917 | sawindex = 1; |
| 918 | ap->a_areg2 = regno; |
| 919 | } |
| 920 | break; |
| 921 | |
| 922 | } /*end of the switch to process an arg*/ |
| 923 | } /*end of processing an argument*/ |
| 924 | |
| 925 | if (sawmul){ |
| 926 | /* |
| 927 | * Make a concession for *(%r) |
| 928 | * meaning *0(%r) |
| 929 | */ |
| 930 | if (ap->a_atype == ABASE) { |
| 931 | ap->a_atype = ADISP; |
| 932 | xp->e_xtype = XABS; |
| 933 | xp->e_number = Znumber; |
| 934 | xp->e_number.num_tag = TYPL; |
| 935 | xp->e_xloc = 0; |
| 936 | ap->a_xp = xp++; |
| 937 | } |
| 938 | ap->a_atype |= ASTAR; |
| 939 | sawmul = 0; |
| 940 | } |
| 941 | if (sawindex){ |
| 942 | ap->a_atype |= AINDX; |
| 943 | sawindex = 0; |
| 944 | } |
| 945 | ap->a_dispsize = sawsize == 0 ? d124 : sawsize; |
| 946 | if (val != CM) break; |
| 947 | shiftover(CM); |
| 948 | } /*processing all the arguments*/ |
| 949 | |
| 950 | if (argcnt > 6){ |
| 951 | yyerror("More than 6 arguments"); |
| 952 | goto errorfix; |
| 953 | } |
| 954 | |
| 955 | /* |
| 956 | * See if this is a case instruction, |
| 957 | * so we can set up tests on the following |
| 958 | * vector of branch displacements |
| 959 | */ |
| 960 | if (yyopcode.Op_eopcode == CORE){ |
| 961 | switch(yyopcode.Op_popcode){ |
| 962 | case 0x8f: /* caseb */ |
| 963 | case 0xaf: /* casew */ |
| 964 | case 0xcf: /* casel */ |
| 965 | incasetable++; |
| 966 | break; |
| 967 | default: |
| 968 | incasetable = 0; |
| 969 | break; |
| 970 | } |
| 971 | } |
| 972 | |
| 973 | insout(yyopcode, arglist, |
| 974 | auxval == INSTn ? argcnt : - argcnt); |
| 975 | break; |
| 976 | |
| 977 | case IQUAD: toconv = TYPQ; goto bignumlist; |
| 978 | case IOCTA: toconv = TYPO; goto bignumlist; |
| 979 | |
| 980 | case IFFLOAT: toconv = TYPF; goto bignumlist; |
| 981 | case IDFLOAT: toconv = TYPD; goto bignumlist; |
| 982 | case IGFLOAT: toconv = TYPG; goto bignumlist; |
| 983 | case IHFLOAT: toconv = TYPH; goto bignumlist; |
| 984 | bignumlist: |
| 985 | /* |
| 986 | * eat a list of non 32 bit numbers. |
| 987 | * IQUAD and IOCTA can, possibly, return |
| 988 | * INT's, if the numbers are "small". |
| 989 | * |
| 990 | * The value of the numbers is coming back |
| 991 | * as an expression, NOT in yybignum. |
| 992 | */ |
| 993 | shift; /* over the opener */ |
| 994 | if ((val == BIGNUM) || (val == INT)){ |
| 995 | do{ |
| 996 | if ((val != BIGNUM) && (val != INT)){ |
| 997 | ERROR(ty_float[toconv] |
| 998 | ? "floating number expected" |
| 999 | : "integer number expected" ); |
| 1000 | } |
| 1001 | dotp->e_xvalue += ty_nbyte[toconv]; |
| 1002 | if (passno == 2){ |
| 1003 | bignumwrite( |
| 1004 | ((struct exp *)yylval)->e_number, |
| 1005 | toconv); |
| 1006 | } |
| 1007 | xp = explist; |
| 1008 | shift; /* over this number */ |
| 1009 | if (auxval = (val == CM)) |
| 1010 | shift; /* over the comma */ |
| 1011 | } while (auxval); /* as long as there are commas */ |
| 1012 | } |
| 1013 | break; |
| 1014 | /* end of the case for initialized big numbers */ |
| 1015 | } /*end of the switch for looking at each reserved word*/ |
| 1016 | |
| 1017 | continue; |
| 1018 | |
| 1019 | errorfix: |
| 1020 | /* |
| 1021 | * got here by either requesting to skip to the |
| 1022 | * end of this statement, or by erroring out and |
| 1023 | * wanting to apply panic mode recovery |
| 1024 | */ |
| 1025 | while ( (val != NL) |
| 1026 | && (val != SEMI) |
| 1027 | && (val != PARSEEOF) |
| 1028 | ){ |
| 1029 | shift; |
| 1030 | } |
| 1031 | if (val == NL) |
| 1032 | lineno++; |
| 1033 | shift; |
| 1034 | |
| 1035 | } /*end of the loop to read the entire file, line by line*/ |
| 1036 | |
| 1037 | } /*end of yyparse*/ |
| 1038 | |
| 1039 | /* |
| 1040 | * Process a register declaration of the form |
| 1041 | * % <expr> |
| 1042 | * |
| 1043 | * Note: |
| 1044 | * The scanner has already processed funny registers of the form |
| 1045 | * %dd[+-]*, where dd is a decimal number in the range 00 to 15 (optional |
| 1046 | * preceding zero digit). If there was any space between the % and |
| 1047 | * the digit, the scanner wouldn't have recognized it, so we |
| 1048 | * hack it out here. |
| 1049 | */ |
| 1050 | inttoktype funnyreg(val, regnoback) /*what the read head will sit on*/ |
| 1051 | inttoktype val; /*what the read head is sitting on*/ |
| 1052 | int *regnoback; /*call by return*/ |
| 1053 | { |
| 1054 | reg struct exp *locxp; |
| 1055 | struct exp *loc1xp; |
| 1056 | struct exp **ptrloc1xp = & loc1xp; |
| 1057 | |
| 1058 | expr(locxp, val); /*and leave the current read head with value*/ |
| 1059 | if ( (passno == 2) && |
| 1060 | ( (locxp->e_xtype & XTYPE) != XABS |
| 1061 | || (locxp->e_xvalue < 0) |
| 1062 | || (locxp->e_xvalue >= 16) |
| 1063 | ) |
| 1064 | ){ |
| 1065 | yyerror("Illegal register"); |
| 1066 | return(0); |
| 1067 | } |
| 1068 | *regnoback = locxp->e_xvalue; |
| 1069 | return(val); |
| 1070 | } |
| 1071 | /* |
| 1072 | * Shift over error |
| 1073 | */ |
| 1074 | shiftoerror(token) |
| 1075 | int token; |
| 1076 | { |
| 1077 | char *tok_to_name(); |
| 1078 | yyerror("%s expected", tok_to_name(token)); |
| 1079 | } |
| 1080 | |
| 1081 | /*VARARGS1*/ |
| 1082 | yyerror(s, a1, a2,a3,a4,a5) |
| 1083 | char *s; |
| 1084 | { |
| 1085 | |
| 1086 | #define sink stdout |
| 1087 | |
| 1088 | if (anyerrs == 0 && anywarnings == 0 && ! silent) |
| 1089 | fprintf(sink, "Assembler:\n"); |
| 1090 | anyerrs++; |
| 1091 | if (silent) |
| 1092 | return; |
| 1093 | fprintf(sink, "\"%s\", line %d: ", dotsname, lineno); |
| 1094 | fprintf(sink, s, a1, a2,a3,a4,a5); |
| 1095 | fprintf(sink, "\n"); |
| 1096 | #undef sink |
| 1097 | } |
| 1098 | |
| 1099 | /*VARARGS1*/ |
| 1100 | yywarning(s, a1, a2,a3,a4,a5) |
| 1101 | char *s; |
| 1102 | { |
| 1103 | #define sink stdout |
| 1104 | if (anyerrs == 0 && anywarnings == 0 && ! silent) |
| 1105 | fprintf(sink, "Assembler:\n"); |
| 1106 | anywarnings++; |
| 1107 | if (silent) |
| 1108 | return; |
| 1109 | fprintf(sink, "\"%s\", line %d: WARNING: ", dotsname, lineno); |
| 1110 | fprintf(sink, s, a1, a2,a3,a4,a5); |
| 1111 | fprintf(sink, "\n"); |
| 1112 | #undef sink |
| 1113 | } |