4.3BSD - /usr/src/lib/mip/fort.c

   1: #ifndef lint
   2: static char *sccsid ="@(#)fort.c	4.7 (Berkeley) 8/22/85";
   3: #endif lint
   4: 
   5: # ifndef FORT
   6: # define FORT
   7: /* this may force larger trees, etc. */
   8: # endif
   9: 
  10: # include "pass2.h"
  11: # include "fort.h"
  12: 
  13: /*	masks for unpacking longs */
  14: 
  15: # ifndef FOP
  16: # define FOP(x) (int)((x)&0377)
  17: # endif
  18: 
  19: # ifndef VAL
  20: # define VAL(x) (int)(((x)>>8)&0377)
  21: # endif
  22: 
  23: # ifndef REST
  24: # define REST(x) (((x)>>16)&0177777)
  25: # endif
  26: 
  27: # ifndef FIXINT
  28: # if SZINT == SZLONG
  29: # define FIXINT(x) ((x) == LONG || (x) == ULONG ? (x) - 1 : (x))
  30: # else
  31: # if SZINT == SZSHORT
  32: # define FIXINT(x) ((x) == SHORT || (x) == USHORT ? (x) + 1 : (x))
  33: # else
  34: # define FIXINT(x) (x)
  35: # endif
  36: # endif
  37: # endif
  38: 
  39: FILE * lrd;  /* for default reading routines */
  40: 
  41: # ifndef NOLNREAD
  42: #ifdef FLEXNAMES
  43: char *
  44: lnread()
  45: {
  46:     char buf[BUFSIZ];
  47:     register char *cp = buf;
  48:     register char *limit = &buf[BUFSIZ];
  49: 
  50:     for (;;) {
  51:         if (fread(cp, sizeof (long), 1, lrd) !=  1)
  52:             cerror("intermediate file read error");
  53:         cp += sizeof (long);
  54:         if (cp[-1] == 0)
  55:             break;
  56:         if (cp >= limit)
  57:             cerror("lnread overran string buffer");
  58:     }
  59:     return (tstr(buf));
  60: }
  61: #endif
  62: # endif NOLNREAD
  63: 
  64: # ifndef NOLREAD
  65: long lread(){
  66:     static long x;
  67:     if( fread( (char *) &x, 4, 1, lrd ) <= 0 ) cerror( "intermediate file read error" );
  68:     return( x );
  69:     }
  70: # endif
  71: 
  72: # ifndef NOLOPEN
  73: lopen( s ) char *s; {
  74:     /* if null, opens the standard input */
  75:     if( *s ){
  76:         lrd = fopen( s, "r" );
  77:         if( lrd == NULL ) cerror( "cannot open intermediate file %s", s );
  78:         }
  79:     else  lrd = stdin;
  80:     }
  81: # endif
  82: 
  83: # ifndef NOLCREAD
  84: lcread( cp, n ) char *cp; {
  85:     if( n > 0 ){
  86:         if( fread( cp, 4, n, lrd ) != n ) cerror( "intermediate file read error" );
  87:         }
  88:     }
  89: # endif
  90: 
  91: # ifndef NOLCCOPY
  92: lccopy( n ) register n; {
  93:     register i;
  94:     static char fbuf[BUFSIZ];
  95:     if( n > 0 ){
  96:         if( n > BUFSIZ/4 ) cerror( "lccopy asked to copy too much" );
  97:         if( fread( fbuf, 4, n, lrd ) != n ) cerror( "intermediate file read error" );
  98:         for( i=4*n; fbuf[i-1] == '\0' && i>0; --i ) { /* VOID */ }
  99:         if( i ) {
 100:             if( fwrite( fbuf, 1, i, stdout ) != i ) cerror( "output file error" );
 101:             }
 102:         }
 103:     }
 104: # endif
 105: 
 106: /*	stack for reading nodes in postfix form */
 107: 
 108: # define NSTACKSZ 250
 109: 
 110: NODE * fstack[NSTACKSZ];
 111: NODE ** fsp;  /* points to next free position on the stack */
 112: 
 113: unsigned int offsz;
 114: unsigned int caloff();
 115: mainp2( argc, argv ) char *argv[]; {
 116:     int files;
 117:     register long x;
 118:     register NODE *p;
 119: 
 120:     offsz = caloff();
 121:     files = p2init( argc, argv );
 122:     tinit();
 123: 
 124: 
 125:     if( files ){
 126:         while( files < argc && argv[files][0] == '-' ) {
 127:             ++files;
 128:             }
 129:         if( files > argc ) return( nerrors );
 130:         lopen( argv[files] );
 131:         }
 132:     else lopen( "" );
 133: 
 134:     fsp = fstack;
 135: 
 136:     for(;;){
 137:         /* read nodes, and go to work... */
 138:         x = lread();
 139: 
 140:     if( xdebug ) fprintf( stderr, "op=%d, val = %d, rest = 0%o\n", FOP(x), VAL(x), (int)REST(x) );
 141:         switch( (int)FOP(x) ){  /* switch on opcode */
 142: 
 143:         case 0:
 144:             fprintf( stderr, "null opcode ignored\n" );
 145:             continue;
 146:         case FTEXT:
 147:             lccopy( VAL(x) );
 148:             printf( "\n" );
 149:             continue;
 150: 
 151:         case FLBRAC:
 152:             tmpoff = baseoff = lread();
 153:             maxtreg = VAL(x);
 154:             if( ftnno != REST(x) ){
 155:                 /* beginning of function */
 156:                 maxoff = baseoff;
 157:                 ftnno = REST(x);
 158:                 maxtemp = 0;
 159:                 }
 160:             else {
 161:                 if( baseoff > maxoff ) maxoff = baseoff;
 162:                 /* maxoff at end of ftn is max of autos and temps
 163: 				   over all blocks in the function */
 164:                 }
 165:             setregs();
 166:             continue;
 167: 
 168:         case FRBRAC:
 169:             SETOFF( maxoff, ALSTACK );
 170:             eobl2();
 171:             continue;
 172: 
 173:         case FEOF:
 174:             return( nerrors );
 175: 
 176:         case FSWITCH:
 177:             uerror( "switch not yet done" );
 178:             for( x=VAL(x); x>0; --x ) lread();
 179:             continue;
 180: 
 181:         case ICON:
 182:             p = talloc();
 183:             p->in.op = ICON;
 184:             p->in.type = FIXINT(REST(x));
 185:             p->tn.rval = 0;
 186:             p->tn.lval = lread();
 187:             if( VAL(x) ){
 188: #ifndef FLEXNAMES
 189:                 lcread( p->in.name, 2 );
 190: #else
 191:                 p->in.name = lnread();
 192: #endif
 193:                 }
 194: #ifndef FLEXNAMES
 195:             else p->in.name[0] = '\0';
 196: #else
 197:             else p->in.name = "";
 198: #endif
 199: 
 200:         bump:
 201:             p->in.su = 0;
 202:             p->in.rall = NOPREF;
 203:             *fsp++ = p;
 204:             if( fsp >= &fstack[NSTACKSZ] ) uerror( "expression depth exceeded" );
 205:             continue;
 206: 
 207:         case NAME:
 208:             p = talloc();
 209:             p->in.op = NAME;
 210:             p->in.type = FIXINT(REST(x));
 211:             p->tn.rval = 0;
 212:             if( VAL(x) ) p->tn.lval = lread();
 213:             else p->tn.lval = 0;
 214: #ifndef FLEXNAMES
 215:             lcread( p->in.name, 2 );
 216: #else
 217:             p->in.name = lnread();
 218: #endif
 219:             goto bump;
 220: 
 221:         case OREG:
 222:             p = talloc();
 223:             p->in.op = OREG;
 224:             p->in.type = FIXINT(REST(x));
 225:             p->tn.rval = VAL(x);
 226:             rbusy( p->tn.rval, PTR | p->in.type );
 227:             p->tn.lval = lread();
 228: #ifndef FLEXNAMES
 229:             lcread( p->in.name, 2 );
 230: #else
 231:             p->in.name = lnread();
 232: #endif
 233:             goto bump;
 234: 
 235:         case REG:
 236:             p = talloc();
 237:             p->in.op = REG;
 238:             p->in.type = FIXINT(REST(x));
 239:             p->tn.rval = VAL(x);
 240:             rbusy( p->tn.rval, p->in.type );
 241:             p->tn.lval = 0;
 242: #ifndef FLEXNAMES
 243:             p->in.name[0] = '\0';
 244: #else
 245:             p->in.name = "";
 246: #endif
 247:             goto bump;
 248: 
 249:         case FEXPR:
 250:             lineno = REST(x);
 251:             if( VAL(x) ) lcread( filename, VAL(x) );
 252:             if( fsp == fstack ) continue;  /* filename only */
 253:             if( --fsp != fstack ) uerror( "expression poorly formed" );
 254:             if( lflag ) lineid( lineno, filename );
 255:             tmpoff = baseoff;
 256:             p = fstack[0];
 257:             if( edebug ) fwalk( p, eprint, 0 );
 258: # ifdef MYREADER
 259:             MYREADER(p);
 260: # endif
 261: 
 262:             nrecur = 0;
 263:             delay( p );
 264:             reclaim( p, RNULL, 0 );
 265: 
 266:             allchk();
 267:             tcheck();
 268:             continue;
 269: 
 270:         case FLABEL:
 271:             if( VAL(x) ){
 272:                 tlabel();
 273:                 }
 274:             else {
 275:                 label( (int) REST(x) );
 276:                 }
 277:             continue;
 278: 
 279:         case GOTO:
 280:             if( VAL(x) ) {
 281:                 cbgen( 0, (int) REST(x), 'I' );  /* unconditional branch */
 282:                 continue;
 283:                 }
 284:             /* otherwise, treat as unary */
 285:             goto def;
 286: 
 287:         case STASG:
 288:         case STARG:
 289:         case STCALL:
 290:         case UNARY STCALL:
 291:                 /*
 292: 			     * size and alignment come from next long words
 293: 			     */
 294:             p = talloc();
 295:             p -> stn.stsize = lread();
 296:             p -> stn.stalign = lread();
 297:             goto defa;
 298:         default:
 299:         def:
 300:             p = talloc();
 301:         defa:
 302:             p->in.op = FOP(x);
 303:             p->in.type = FIXINT(REST(x));
 304: 
 305:             switch( optype( p->in.op ) ){
 306: 
 307:             case BITYPE:
 308:                 p->in.right = *--fsp;
 309:                 p->in.left = *--fsp;
 310:                 goto bump;
 311: 
 312:             case UTYPE:
 313:                 p->in.left = *--fsp;
 314:                 p->tn.rval = 0;
 315:                 goto bump;
 316: 
 317:             case LTYPE:
 318:                 uerror( "illegal leaf node: %d", p->in.op );
 319:                 exit( 1 );
 320:                 }
 321:             }
 322:         }
 323:     }

Defined functions

Defined variables

Defined macros