1: /*	@(#)gen.c	2.2	SCCS id keyword	*/
   2: /* Copyright (c) 1979 Regents of the University of California */
   3: #
   4: /*
   5:  * pi - Pascal interpreter code translator
   6:  *
   7:  * Charles Haley, Bill Joy UCB
   8:  * Version 1.2 November 1978
   9:  */
  10: 
  11: #include "whoami"
  12: #include "0.h"
  13: #include "tree.h"
  14: #include "opcode.h"
  15: 
  16: /*
  17:  * This array tells the type
  18:  * returned by an arithmetic
  19:  * operation.  It is indexed
  20:  * by the logarithm of the
  21:  * lengths base 2.
  22:  */
  23: #ifndef DEBUG
  24: char    arret[] = {
  25:     T4INT,      T4INT,      T4INT,      TDOUBLE,
  26:     T4INT,      T4INT,      T4INT,      TDOUBLE,
  27:     T4INT,      T4INT,      T4INT,      TDOUBLE,
  28:     TDOUBLE,    TDOUBLE,    TDOUBLE,    TDOUBLE
  29: };
  30: #else
  31: char    arret0[] = {
  32:     T4INT,      T4INT,      T4INT,      TDOUBLE,
  33:     T4INT,      T4INT,      T4INT,      TDOUBLE,
  34:     T4INT,      T4INT,      T4INT,      TDOUBLE,
  35:     TDOUBLE,    TDOUBLE,    TDOUBLE,    TDOUBLE
  36: };
  37: char    arret1[] = {
  38:     T4INT,      T4INT,      T4INT,      TDOUBLE,
  39:     T4INT,      T4INT,      T4INT,      TDOUBLE,
  40:     T4INT,      T4INT,      T4INT,      TDOUBLE,
  41:     TDOUBLE,    TDOUBLE,    TDOUBLE,    TDOUBLE
  42: };
  43: char    *arret = arret0;
  44: #endif
  45: 
  46: /*
  47:  * These array of arithmetic and set
  48:  * operators are indexed by the
  49:  * tree nodes and is highly dependent
  50:  * on their order.  They thus take
  51:  * on the flavor of magic.
  52:  */
  53: int arop[] = {
  54:     0, O_NEG2, O_MOD2, O_DIV2, O_DVD2, O_MUL2, O_ADD2, O_SUB2,
  55:     O_REL2, O_REL2, O_REL2, O_REL2, O_REL2, O_REL2
  56: };
  57: int setop[] = {
  58:     O_MULT, O_ADDT, O_SUBT,
  59:     O_RELT, O_RELT, O_RELT, O_RELT, O_RELT, O_RELT,
  60: };
  61: 
  62: /*
  63:  * The following array is
  64:  * used when operating on
  65:  * two reals since they are
  66:  * shoved off in a corner in
  67:  * the interpreter table.
  68:  */
  69: int ar8op[] = {
  70:     O_DVD8, O_MUL8, O_ADD8, O_SUB8,
  71:     O_REL8, O_REL8, O_REL8, O_REL8, O_REL8, O_REL8,
  72: };
  73: 
  74: /*
  75:  * The following arrays, which are linearizations
  76:  * of two dimensional arrays, are the offsets for
  77:  * arithmetic, relational and assignment operations
  78:  * indexed by the logarithms of the argument widths.
  79:  */
  80: #ifndef DEBUG
  81: char artab[] = {
  82:     O_ADD2-O_ADD2,  O_ADD2-O_ADD2,  O_ADD42-O_ADD2, O_ADD82-O_ADD2,
  83:     O_ADD2-O_ADD2,  O_ADD2-O_ADD2,  O_ADD42-O_ADD2, O_ADD82-O_ADD2,
  84:     O_ADD24-O_ADD2, O_ADD24-O_ADD2, O_ADD4-O_ADD2,  O_ADD84-O_ADD2,
  85:     O_ADD28-O_ADD2, O_ADD28-O_ADD2, O_ADD48-O_ADD2, -1
  86: };
  87: #else
  88: char artab0[] = {
  89:     O_ADD2-O_ADD2,  O_ADD2-O_ADD2,  O_ADD42-O_ADD2, O_ADD82-O_ADD2,
  90:     O_ADD2-O_ADD2,  O_ADD2-O_ADD2,  O_ADD42-O_ADD2, O_ADD82-O_ADD2,
  91:     O_ADD24-O_ADD2, O_ADD24-O_ADD2, O_ADD4-O_ADD2,  O_ADD84-O_ADD2,
  92:     O_ADD28-O_ADD2, O_ADD28-O_ADD2, O_ADD48-O_ADD2, -1
  93: };
  94: char artab1[] = {
  95:     O_ADD2-O_ADD2,  O_ADD2-O_ADD2,  O_ADD2-O_ADD2,  O_ADD82-O_ADD2,
  96:     O_ADD2-O_ADD2,  O_ADD2-O_ADD2,  O_ADD2-O_ADD2,  O_ADD82-O_ADD2,
  97:     O_ADD2-O_ADD2,  O_ADD2-O_ADD2,  O_ADD2-O_ADD2,  O_ADD84-O_ADD2,
  98:     O_ADD28-O_ADD2, O_ADD28-O_ADD2, O_ADD28-O_ADD2, -1
  99: };
 100: char    *artab = artab0;
 101: #endif
 102: #ifndef DEBUG
 103: char reltab[] = {
 104:     O_REL2-O_REL2,  O_REL2-O_REL2,  O_REL42-O_REL2, O_REL82-O_REL2,
 105:     O_REL2-O_REL2,  O_REL2-O_REL2,  O_REL42-O_REL2, O_REL82-O_REL2,
 106:     O_REL24-O_REL2, O_REL24-O_REL2, O_REL4-O_REL2,  O_REL84-O_REL2,
 107:     O_REL28-O_REL2, O_REL28-O_REL2, O_REL48-O_REL2, O_REL8-O_REL2
 108: };
 109: #else
 110: char reltab0[] = {
 111:     O_REL2-O_REL2,  O_REL2-O_REL2,  O_REL42-O_REL2, O_REL82-O_REL2,
 112:     O_REL2-O_REL2,  O_REL2-O_REL2,  O_REL42-O_REL2, O_REL82-O_REL2,
 113:     O_REL24-O_REL2, O_REL24-O_REL2, O_REL4-O_REL2,  O_REL84-O_REL2,
 114:     O_REL28-O_REL2, O_REL28-O_REL2, O_REL48-O_REL2, O_REL8-O_REL2
 115: };
 116: char reltab1[] = {
 117:     O_REL2-O_REL2,  O_REL2-O_REL2,  O_REL2-O_REL2,  O_REL82-O_REL2,
 118:     O_REL2-O_REL2,  O_REL2-O_REL2,  O_REL2-O_REL2,  O_REL82-O_REL2,
 119:     O_REL2-O_REL2,  O_REL2-O_REL2,  O_REL2-O_REL2,  O_REL82-O_REL2,
 120:     O_REL28-O_REL2, O_REL28-O_REL2, O_REL28-O_REL2, O_REL8-O_REL2
 121: };
 122: char *reltab = reltab0;
 123: #endif
 124: 
 125: #ifndef DEBUG
 126: char asgntab[] = {
 127:     O_AS21-O_AS2,   O_AS21-O_AS2,   O_AS41-O_AS2,   -1,
 128:     O_AS2-O_AS2,    O_AS2-O_AS2,    O_AS42-O_AS2,   -1,
 129:     O_AS24-O_AS2,   O_AS24-O_AS2,   O_AS4-O_AS2,    -1,
 130:     O_AS28-O_AS2,   O_AS28-O_AS2,   O_AS48-O_AS2,   O_AS8-O_AS2,
 131: };
 132: #else
 133: char asgntb0[] = {
 134:     O_AS21-O_AS2,   O_AS21-O_AS2,   O_AS41-O_AS2,   -1,
 135:     O_AS2-O_AS2,    O_AS2-O_AS2,    O_AS42-O_AS2,   -1,
 136:     O_AS24-O_AS2,   O_AS24-O_AS2,   O_AS4-O_AS2,    -1,
 137:     O_AS28-O_AS2,   O_AS28-O_AS2,   O_AS48-O_AS2,   O_AS8-O_AS2,
 138: };
 139: char asgntb1[] = {
 140:     O_AS21-O_AS2,   O_AS21-O_AS2,   O_AS21-O_AS2,   -1,
 141:     O_AS2-O_AS2,    O_AS2-O_AS2,    O_AS2-O_AS2,    -1,
 142:     O_AS2-O_AS2,    O_AS2-O_AS2,    O_AS2-O_AS2,    -1,
 143:     O_AS28-O_AS2,   O_AS28-O_AS2,   O_AS28-O_AS2,   O_AS4-O_AS2,
 144: };
 145: char *asgntab = asgntb0;
 146: #endif
 147: 
 148: #ifdef DEBUG
 149: genmx()
 150: {
 151: 
 152:     arret = arret1;
 153:     artab = artab1;
 154:     reltab = reltab1;
 155:     asgntab = asgntb1;
 156: }
 157: #endif
 158: 
 159: /*
 160:  * Gen generates code for assignments,
 161:  * and arithmetic and string operations
 162:  * and comparisons.
 163:  */
 164: struct nl *
 165: gen(p, o, w1, w2)
 166:     int p, o, w1, w2;
 167: {
 168:     register i, j;
 169:     int op, off;
 170: 
 171:     switch (p) {
 172:         case O_AS2:
 173:         case NIL:
 174:             i = j = -1;
 175:             /*
 176: 			 * Take the log2 of the widths
 177: 			 * and linearize them for indexing.
 178: 			 * width for indexing.
 179: 			 */
 180: #ifdef DEBUG
 181:             if (hp21mx) {
 182:                 if (w1 == 4)
 183:                     w1 = 8;
 184:                 if (w2 == 4)
 185:                     w2 = 8;
 186:             }
 187: #endif
 188:             do i++; while (w1 >>= 1);
 189:             do j++; while (w2 >>= 1);
 190:             i <<= 2;
 191:             i |= j;
 192:             if (p == O_AS2) {
 193:                 put1(O_AS2 + asgntab[i]);
 194:                 return (NIL);
 195:             }
 196:             op = arop[o];
 197:             if (op == O_REL2) {
 198:                 put1((op + reltab[i]) | (o - T_EQ) << 9);
 199:                 return (nl+TBOOL);
 200:             }
 201:             put1(i == 15 ? ar8op[o-T_DIVD] : op | artab[i]);
 202:             return (op == O_DVD2 && !divchk ? nl+TDOUBLE : nl+arret[i]);
 203:         case TSTR:
 204:             put2(O_RELG | (o - T_EQ) << 9, w1);
 205:             return (nl+TBOOL);
 206:         case TSET:
 207:             op = setop[o-T_MULT];
 208:             if (op == O_RELT)
 209:                 op |= (o - T_EQ)<<9;
 210:             put2(op, w1);
 211:             return (o >= T_EQ ? nl+TBOOL : nl+TSET);
 212:         default:
 213:             panic("gen");
 214:     }
 215: }

Defined functions

genmx defined in line 149; used 1 times

Defined variables

ar8op defined in line 69; used 1 times
arop defined in line 53; used 1 times
arret defined in line 43; used 2 times
arret0 defined in line 31; used 1 times
  • in line 43
arret1 defined in line 37; used 1 times
artab defined in line 100; used 2 times
artab0 defined in line 88; used 1 times
artab1 defined in line 94; used 1 times
asgntab defined in line 145; used 2 times
asgntb0 defined in line 133; used 1 times
asgntb1 defined in line 139; used 1 times
reltab defined in line 122; used 2 times
reltab0 defined in line 110; used 1 times
reltab1 defined in line 116; used 1 times
setop defined in line 57; used 1 times
Last modified: 1981-07-10
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