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g2.c
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C/C++ Source or Header
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1992-05-06
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627 lines
/* Copyright (c) 1988 by Sozobon, Limited. Author: Johann Ruegg
*
* Permission is granted to anyone to use this software for any purpose
* on any computer system, and to redistribute it freely, with the
* following restrictions:
* 1) No charge may be made other than reasonable charges for reproduction.
* 2) Modified versions must be clearly marked as such.
* 3) The authors are not responsible for any harmful consequences
* of using this software, even if they result from defects in it.
*
* g2.c
*
* Generate code for binary nodes.
*/
#include <stdio.h>
#include "param.h"
#include "nodes.h"
#include "flags.h"
#include "bstok.h"
#include "gen.h"
#include "ops.h"
#define FAIL 0
#define OKAY 1
extern int cookflags[];
#define isimmed(np) ((np)->g_flags & IMMEDID)
#define isareg(np) ((np)->g_token == REGVAR && (np)->g_rno >= AREG)
struct bop {
char *s_op, *u_op;
int opflags;
} bops[] = {
{"muls", "mulu", EOPD |ASSOC},
{"divs", "divu", EOPD},
{"divs", "divu", EOPD},
{"and", "and", EOPD|DOPE|IOPE |ASSOC},
{"or", "or", EOPD|DOPE|IOPE |ASSOC},
{"eor", "eor", DOPE|IOPE |ASSOC},
{"add", "add", EOPD|DOPE|EOPA|IOPE|AOPA|AOPD |ASSOC},
{"sub", "sub", EOPD|DOPE|EOPA|IOPE|AOPA|AOPD},
{"asl", "lsl", DOPD|QOPD|ONEOPM},
{"asr", "lsr", DOPD|QOPD|ONEOPM},
};
char *tstnm[] = {
"lt", /* < */
"gt", /* > */
"le", /* <= */
"ge", /* >= */
"eq", /* == */
"ne", /* != */
};
int tstx[] = {
B_LT, B_GT, B_LE, B_GE, B_EQ, B_NE
};
char *utstnm[] = {
"cs", /* < */
"hi", /* > */
"ls", /* <= */
"cc", /* >= */
"eq", /* == */
"ne", /* != */
};
int utstx[] = {
B_ULT, B_UGT, B_ULE, B_UGE, B_EQ, B_NE
};
b_eval(np, cookie)
register NODEP np;
{
NODEP lp = np->n_left, rp = np->n_right;
NODEP tp;
int lcook = FORADR, rcook = FORADR;
switch (np->g_token) { /* special cookies */
case DOUBLE '&':
case DOUBLE '|':
lcook = rcook = FORCC;
break;
case '?':
lcook = FORCC;
break;
case '(':
rcook = FORPUSH;
break;
case ',':
if (np->g_offs) /* function args */
lcook = rcook = FORPUSH;
else {
lcook = FORSIDE;
rcook = cookie;
}
break;
case '=':
rcook = FORIMA;
break;
case '+':
case '-':
tp = rp;
while (tp->g_token == TCONV && tp->g_ty != ET_F)
tp = tp->n_left;
if (tp->g_token == ICON)
lcook = FORIMA;
break;
}
if (np->g_type == EV_LR) {
if (eval(lp,lcook) == FAIL)
return FAIL;
freetmps(lp);
if (eval(rp,rcook) == FAIL)
return FAIL;
freetmps(rp);
} else if (np->g_type == EV_RL) {
if (eval(rp,rcook) == FAIL)
return FAIL;
freetmps(rp);
if (eval(lp,lcook) == FAIL)
return FAIL;
freetmps(lp);
} else { /* EV_LRSEP */
if (eval(lp,lcook) == FAIL)
return FAIL;
freetmps(lp);
free1(NULL, lp);
if (eval(rp,rcook) == FAIL)
return FAIL;
freetmps(rp);
}
return b_sube(np, cookflags[cookie]);
}
b_sube(np, flags)
register NODEP np;
{
NODEP lp = np->n_left, rp = np->n_right;
register int i, r;
int argsize;
char buf[40];
if (isassign(np->g_token))
return as_eval(np);
switch (np->g_token) {
case '=':
if (specasn(np, flags) || strasn(np))
return OKAY;
inherit(np);
addcode(np, "\tmove.S\t>A,<A\n");
return OKAY;
case '(':
argsize = argmod(rp);
free1(NULL,rp);
if (np->g_ty == ET_A) { /* struct returned */
frc_ral(AREG);
indir(np, AREG);
} else {
frc_ral(0);
retreg(np, 0);
}
externfuncref(np);
sprintf(buf, "\tjsr\t<A\n\tadd.w\t#%d,sp\n", argsize);
addcode(np, buf);
return OKAY;
case ',':
if (np->g_offs == 0) /* normal ',' */
rinherit(np);
return OKAY;
case DOUBLE '&':
free1(NULL, rp);
r = ralloc(0);
retreg(np, r);
holdlbls(np);
np->g_betw = iscc(lp) ? "<FL1\n" :
"<Q\tbeq\tL1\n";
addcode(np, iscc(rp) ? ">FL1\n" :
">Q\tbeq\tL1\n");
addcode(np, "\tmoveq\t#1,A\n");
addcode(np, "\tbra\tL2\nL1:\tclr\tA\nL2:\n");
return OKAY;
case DOUBLE '|':
free1(NULL, rp);
r = ralloc(0);
retreg(np, r);
holdlbls(np);
np->g_betw = iscc(lp) ? "<TL1\n" :
"<Q\tbne\tL1\n";
addcode(np, iscc(rp) ? ">TL1\n" :
">Q\tbne\tL1\n");
addcode(np, "\tclr\tA\n");
addcode(np, "\tbra\tL2\nL1:\tmoveq\t#1,A\nL2:\n");
return OKAY;
case '?':
rinherit(np);
rinhlbls(np);
np->g_betw = iscc(lp) ? "<FL1\n" : "<Q\tbeq\tL1\n";
return OKAY;
case ':':
free1(NULL, rp);
r = ralloc(0);
retreg(np, r);
holdlbls(np);
np->g_betw = same_a(np, lp) ?
"\tbra\tL2\nL1:\n" :
"\tmove.S\t<A,A\n\tbra\tL2\nL1:\n";
if (!same_a(np, rp))
addcode(np, "\tmove.S\t>A,A\n");
addcode(np, "L2:\n");
return OKAY;
case '<':
i = 0; goto dotst;
case '>':
i = 1; goto dotst;
case LTEQ:
i = 2; goto dotst;
case GTEQ:
i = 3; goto dotst;
case DOUBLE '=':
i = 4; goto dotst;
case NOTEQ:
i = 5;
dotst:
fix_cmp(np, EOPD|EOPA|IOPE|AOPA|AOPD);
if (flags & CC_OK) {
np->g_token = (lp->g_ty == ET_U ?
utstx[i] : tstx[i]) + BR_TOK;
} else {
strcpy(np->n_name, lp->g_ty == ET_U ?
utstnm[i] : tstnm[i]);
r = ralloc(0);
retreg(np, r);
addcode(np, "\tsN\tA\n\tand.w\t#1,A\n");
}
return OKAY;
case '*':
return fixmul(np, bops[0].opflags);
case '/':
return fixdiv(np, bops[1].opflags);
case '%':
return fixmod(np, bops[2].opflags);
case '&': i = 3; goto doop;
case '|': i = 4; goto doop;
case '^': i = 5; goto doop;
case '+':
if (optadd(np, flags, 1))
return OKAY;
i = 6; goto doop;
case '-':
if (optadd(np, flags, -1))
return OKAY;
i = 7; goto doop;
case DOUBLE '<':i = 8; goto doop;
case DOUBLE '>':i = 9;
doop:
strcpy(np->n_name, np->g_ty == ET_U ?
bops[i].u_op : bops[i].s_op);
r = fix2ops(np, bops[i].opflags);
cc_hack(np);
return r;
case FIELDAS:
return fldasn(np, flags);
default:
printf("Weird b_eval %s ", np->n_name);
return FAIL;
}
}
as_eval(np)
register NODEP np;
{
NODEP rp = np->n_right;
register int op, i, r;
rp = np->n_right;
op = np->g_token;
op -= ASSIGN 0;
switch (op) {
/* these get unfolded now */
case '*':
return fixamul(np, bops[0].opflags);
case '/':
return fixadiv(np, bops[1].opflags);
case '%':
return fixamod(np, bops[2].opflags);
case '&': i = 3; goto doop;
case '|': i = 4; goto doop;
case '^': i = 5; goto doop;
case '+': i = 6; goto doop;
case '-': i = 7; goto doop;
case DOUBLE '<':i = 8; goto doop;
case DOUBLE '>':i = 9;
doop:
strcpy(np->n_name, np->g_ty == ET_U ?
bops[i].u_op : bops[i].s_op);
r = fix_asn(np, bops[i].opflags);
cc_hack(np);
return r;
default:
printf("Weird as_eval %s ", np->n_name);
return FAIL;
}
}
rinherit(np)
register NODEP np;
{
register NODEP rp = np->n_right;
np->g_token = rp->g_token;
np->g_offs = rp->g_offs;
np->g_rno = rp->g_rno;
np->g_flags |= RCHILDNM | (rp->g_flags & IMMEDID);
}
argmod(np)
register NODEP np;
{
int size = 0;
if (np->g_token == ',') {
np->g_type = EV_RL;
size += argmod(np->n_right);
size += argmod(np->n_left);
return size;
}
size += onearg(np);
return size;
}
onearg(np)
register NODEP np;
{
int rv;
/* hack small ICON */
if (np->g_sz == 1 && np->g_token == ICON)
np->g_sz = 2;
/* hack push of 0 */
if (np->g_token == ICON && np->g_offs == 0 && isimmed(np)) {
addcode(np, "\tclr.S\t-(sp)\n");
return (int)np->g_sz;
}
/* hack push of #OREG */
if (np->g_token == OREG && isimmed(np)) {
np->g_flags &= ~IMMEDID;
addcode(np, "\tpea\tA\n");
return 4;
}
if (np->g_ty == ET_A) {
rv = np->g_bsize;
strpush(np);
freetmps(np);
free1(NULL,np);
return rv;
}
switch (np->g_sz) {
case 1:
addcode(np,
"\tmove.b\tA,d0\n\text.w\td0\n\tmove.w\td0,-(sp)\n");
return 2;
case 2:
addcode(np,
"\tmove.w\tA,-(sp)\n");
return 2;
default:
addcode(np,
"\tmove.l\tA,-(sp)\n");
return 4;
}
}
#define MAXD DRV_START
#define MAXA (ARV_START-AREG)
#define NEEDALL (MAXA*AREG + MAXD)
order(np)
register NODEP np;
{
int l, r;
switch (np->g_type) {
case E_BIN:
order(np->n_right);
r = np->n_right->g_needs;
case E_UNARY:
order(np->n_left);
l = np->n_left->g_needs;
break;
default: /* leaf */
np->g_type = EV_NONE;
np->g_needs = 0;
return;
}
if (np->g_type == E_UNARY) {
switch (np->g_token) {
case STAR:
np->g_needs = merge(l,AREG);
break;
case '(':
np->g_needs = NEEDALL;
break;
case POSTINC:
case POSTDEC:
case '!':
np->g_needs = merge(l,1);
break;
case '.':
if (np->g_fldw) {
np->g_needs = merge(l,1);
break;
}
/* else fall through */
default:
np->g_needs = l;
}
np->g_type = EV_LEFT;
return;
}
/* at this point, have binary node */
switch (np->g_token) {
case DOUBLE '&':
case DOUBLE '|':
case '?':
case ':':
/* always left-right, no extra regs */
np->g_type = EV_LRSEP;
np->g_needs = merge(1, merge(l,r));
return;
case ',':
np->g_needs = merge(l, r);
np->g_type = EV_LRSEP;
return;
case '(':
np->g_needs = NEEDALL;
break;
case '^':
case DOUBLE '<':
case DOUBLE '>':
case ASSIGN '/':
case ASSIGN DOUBLE '<':
case ASSIGN DOUBLE '>':
np->g_needs = merge(bin(l,r), 2);
break;
default:
np->g_needs = merge(bin(l,r), 1);
}
if (isassign(np->g_token) || np->g_token == '=')
np->g_type = EV_RL; /* NO PUSHER's on L */
else
np->g_type = worst_1st(l, r);
flag_saves(np, l, r);
}
flag_saves(np, l, r)
NODEP np;
{
NODEP *cpp;
register int other;
if (np->g_type == EV_LR) {
cpp = &np->n_left;
other = r;
} else {
cpp = &np->n_right;
other = l;
}
if ((other & 7) >= MAXD || (other/AREG) >= MAXA)
addtmp(np, cpp);
}
addtmp(np, cpp)
NODEP np, *cpp;
{
NODEP cp, tp;
NODEP copyone();
cp = *cpp;
tp = copyone(cp);
tp->n_left = cp;
*cpp = tp;
tp->g_token = PUSHER;
strcpy(tp->n_name, "pusher");
tp->g_type = EV_LEFT;
}
worst_1st(l,r)
{
int ld, rd;
ld = l & 7;
rd = r & 7;
if (rd > ld)
return EV_RL;
if (r > l)
return EV_RL;
return EV_LR;
}
bin(l,r)
{
int la, ra, na;
int ld, rd, nd;
la = l/AREG;
ra = r/AREG;
ld = l & 7;
rd = r & 7;
na = la > ra ? la : ra;
if (ld == rd)
nd = ld == MAXD ? MAXD : ld+1;
else
nd = ld > rd ? ld : rd;
return na*AREG + nd;
}
merge(need, have)
{
int na, nd, ha, hd, xa, xd;
na = need/AREG;
ha = have/AREG;
nd = need & 7;
hd = have & 7;
xa = na > ha ? na : ha;
xd = nd > hd ? nd : hd;
return xa*AREG + xd;
}
holdlbls(np)
NODEP np;
{
np->g_bsize = new_lbl();
new_lbl();
}
rinhlbls(np)
NODEP np;
{
np->g_bsize = np->n_right->g_bsize;
}
/* limited version of same address check
assume one of these is a temp register */
same_a(p1, p2)
NODEP p1, p2;
{
if (p1->g_token != p2->g_token)
return 0;
if (p1->g_rno != p2->g_rno)
return 0;
return 1;
}
optadd(np, flags, sign)
register NODEP np;
{
NODEP lp = np->n_left, rp = np->n_right;
if (rp->g_token != ICON)
return 0;
if (isimmed(lp) && isimmed(rp)) {
switch (lp->g_token) {
case OREG:
case ONAME:
inherit(np);
if (sign == -1)
rp->g_offs = -rp->g_offs;
np->g_offs += rp->g_offs;
if ((flags & IMMA_OK) == 0)
imm_oreg(np);
return 1;
default:
return 0;
}
}
return 0;
}
iscc(np)
NODEP np;
{
return (np->g_token >= BR_TOK) || (np->g_flags & SIDE_CC);
}
cc_hack(np)
NODEP np;
{
if (isareg(np))
return;
np->g_flags |= SIDE_CC;
}
cctok(np)
NODEP np;
{
if (np->g_token >= BR_TOK)
return np->g_token - BR_TOK;
if (np->g_flags & SIDE_CC)
return B_NE;
printf("cctok error ");
return 0;
}