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[] = "@(#)tmps.c	5.1 (Berkeley) 6/5/85";
   9: #endif not lint
  10: 
  11: #include "whoami.h"
  12: #include "0.h"
  13: #include "objfmt.h"
  14: #ifdef PC
  15: #   include "pc.h"
  16: #endif PC
  17: #include "align.h"
  18: #include "tmps.h"
  19: 
  20: /*
  21:  * This routine defines the register allocation strategy
  22:  * All temporaries are allocated here, and this routines decides
  23:  * where they are to be put.
  24:  */
  25: #ifdef PC
  26:     /*
  27:      *	register temporaries
  28:      *	- are allocated from highreg towards lowreg.
  29:      *	- are of size regsize.
  30:      *	- register numbers from the various register types are mapped to
  31:      *	  integer register numbers using the offsets.  (cf. pcc/mac2defs)
  32:      *
  33:      *	stack temporaries
  34:      *	- are allocated on a downward growing stack.
  35:      */
  36: 
  37: #ifdef vax
  38:     /*
  39:      *	first pass register declaration constants
  40:      */
  41: struct  regtype {
  42:     long    lowreg;
  43:     long    highreg;
  44:     long    regsize;
  45: } regtypes[NUMREGTYPES] = {
  46:     { 6, 11, 4 },       /* r6..r11 */
  47: };
  48: #endif vax
  49: 
  50: #ifdef mc68000
  51:     /*
  52:      *	first pass register declaration constants
  53:      */
  54: struct  regtype {
  55:     long    lowreg;
  56:     long    highreg;
  57:     long    regsize;
  58: } regtypes[NUMREGTYPES] = {
  59:     { 2, 7, 4 },        /* d2..d7 */
  60:     { 2, 5, 4 },        /* a2..a5 */
  61: };
  62: #endif mc68000
  63: #endif PC
  64: 
  65: tmpinit(cbn)
  66:     int cbn;
  67: {
  68:     struct om   *sizesp = &sizes[cbn];
  69: #	ifdef PC
  70:     int i;
  71: #	endif PC
  72: 
  73:     sizesp->om_max = -DPOFF1;
  74:     sizesp->curtmps.om_off = -DPOFF1;
  75: #	ifdef PC
  76:         for (i = 0; i < NUMREGTYPES; i++) {
  77:             sizesp->low_water[i] = regtypes[i].highreg + 1;
  78:             sizesp->curtmps.next_avail[i] = regtypes[i].highreg;
  79:         }
  80: #	endif PC
  81: }
  82: 
  83: /*
  84:  * allocate runtime temporary variables
  85:  */
  86: /*ARGSUSED*/
  87: struct nl *
  88: tmpalloc(size, type, mode)
  89:     long size;
  90:     struct nl *type;
  91:     int mode;
  92: {
  93:     register struct om  *op = &sizes[ cbn ];
  94:     register int        offset;
  95:     register struct nl  *nlp;
  96:     long            alignment;
  97: 
  98: #	ifdef PC
  99: #	    ifdef vax
 100:         if (  mode == REGOK
 101:            && size == regtypes[REG_GENERAL].regsize
 102:            && op->curtmps.next_avail[REG_GENERAL]
 103:                 >= regtypes[REG_GENERAL].lowreg) {
 104:             offset = op->curtmps.next_avail[REG_GENERAL]--;
 105:             if (offset < op->low_water[REG_GENERAL]) {
 106:                 op->low_water[REG_GENERAL] = offset;
 107:             }
 108:             nlp = defnl( (char *) 0 , VAR , type , offset );
 109:             nlp -> extra_flags = NLOCAL | NREGVAR;
 110:             putlbracket(ftnno, op);
 111:             return nlp;
 112:         }
 113: #	    endif vax
 114: #	    ifdef mc68000
 115:         if (  mode == REGOK
 116:            && type != nl + TPTR
 117:            && size == regtypes[REG_DATA].regsize
 118:            && op->curtmps.next_avail[REG_DATA]
 119:                 >= regtypes[REG_DATA].lowreg) {
 120:             offset = op->curtmps.next_avail[REG_DATA]--;
 121:             if (offset < op->low_water[REG_DATA]) {
 122:                 op->low_water[REG_DATA] = offset;
 123:             }
 124:             nlp = defnl(0, VAR, type, offset + DATA_REG_OFFSET );
 125:             nlp -> extra_flags = NLOCAL | NREGVAR;
 126:             putlbracket(ftnno, op);
 127:             return nlp;
 128:         }
 129:         if (  mode == REGOK
 130:            && type == nl + TPTR
 131:            && size == regtypes[REG_ADDR].regsize
 132:            && op->curtmps.next_avail[REG_ADDR]
 133:                 >= regtypes[REG_ADDR].lowreg) {
 134:             offset = op->curtmps.next_avail[REG_ADDR]--;
 135:             if (offset < op->low_water[REG_ADDR]) {
 136:                 op->low_water[REG_ADDR] = offset;
 137:             }
 138:             nlp = defnl(0, VAR, type, offset + ADDR_REG_OFFSET );
 139:             nlp -> extra_flags = NLOCAL | NREGVAR;
 140:             putlbracket(ftnno, op);
 141:             return nlp;
 142:         }
 143: #	    endif mc68000
 144: #	endif PC
 145:     if (type == NIL) {
 146:         alignment = A_STACK;
 147:     } else if (type == nl+TPTR) {
 148:         alignment = A_POINT;
 149:     } else {
 150:         alignment = align(type);
 151:     }
 152:         op->curtmps.om_off =
 153:         roundup((int)(op->curtmps.om_off - size), alignment);
 154:     offset = op->curtmps.om_off;
 155:     if ( offset < op->om_max ) {
 156:             op->om_max = offset;
 157:     }
 158:     nlp = defnl( (char *) 0 , VAR , type , offset );
 159: #	ifdef PC
 160:         nlp -> extra_flags = NLOCAL;
 161:         putlbracket(ftnno, op);
 162: #	endif PC
 163:     return nlp;
 164: }
 165: 
 166: /*
 167:  * deallocate runtime temporary variables
 168:  */
 169: /*ARGSUSED*/
 170: tmpfree(restore)
 171:     register struct tmps    *restore;
 172: {
 173: #   ifdef PC
 174:     register struct om      *op = &sizes[ cbn ];
 175:     bool            change = FALSE;
 176: 
 177: #	ifdef vax
 178:         if (restore->next_avail[REG_GENERAL]
 179:         > op->curtmps.next_avail[REG_GENERAL]) {
 180:             op->curtmps.next_avail[REG_GENERAL]
 181:             = restore->next_avail[REG_GENERAL];
 182:             change = TRUE;
 183:         }
 184: #	endif vax
 185: #	ifdef mc68000
 186:         if (restore->next_avail[REG_DATA]
 187:         > op->curtmps.next_avail[REG_DATA]) {
 188:             op->curtmps.next_avail[REG_DATA]
 189:             = restore->next_avail[REG_DATA];
 190:             change = TRUE;
 191:         }
 192:         if (restore->next_avail[REG_ADDR]
 193:         > op->curtmps.next_avail[REG_ADDR]) {
 194:             op->curtmps.next_avail[REG_ADDR]
 195:             = restore->next_avail[REG_ADDR];
 196:             change = TRUE;
 197:         }
 198: #	endif mc68000
 199:     if (restore->om_off > op->curtmps.om_off) {
 200:         op->curtmps.om_off = restore->om_off;
 201:         change = TRUE;
 202:     }
 203:     if (change) {
 204:         putlbracket(ftnno, op);
 205:     }
 206: #endif PC
 207: }
 208: 
 209: #ifdef PC
 210: #ifdef vax
 211: /*
 212:  * create a save mask for registers which have been used
 213:  * in this level
 214:  */
 215: savmask()
 216: {
 217:     int mask;
 218:     int i;
 219: 
 220:     mask = RSAVEMASK;
 221:     if (opt('t'))
 222:             mask |= RUNCHECK;
 223:     for (i = 0; i <= regtypes[REG_GENERAL].highreg; i++) {
 224:         if (i >= sizes[cbn].low_water[REG_GENERAL]) {
 225:         mask |= 1 << i;
 226:         }
 227:     }
 228:     return mask;
 229: }
 230: #endif vax
 231: #endif PC

Defined functions

savmask defined in line 215; used 1 times
tmpinit defined in line 65; used 2 times

Defined variables

regtypes defined in line 58; used 9 times
sccsid defined in line 8; never used

Defined struct's

regtype defined in line 54; never used
Last modified: 1985-06-06
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