539 lines
9.2 KiB
C
539 lines
9.2 KiB
C
#include "l.h"
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void
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dodata(void)
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{
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int i;
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Sym *s;
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Prog *p;
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long t, u;
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if(debug['v'])
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Bprint(&bso, "%5.2f dodata\n", cputime());
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Bflush(&bso);
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for(p = datap; p != P; p = p->link) {
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s = p->from.sym;
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if(s->type == SBSS)
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s->type = SDATA;
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if(s->type != SDATA)
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diag("initialize non-data (%d): %s\n%P",
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s->type, s->name, p);
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t = p->from.offset + p->from.displace;
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if(t > s->value)
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diag("initialize bounds (%ld): %s\n%P",
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s->value, s->name, p);
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}
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/* allocate small guys */
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datsize = 0;
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for(i=0; i<NHASH; i++)
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for(s = hash[i]; s != S; s = s->link) {
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if(s->type != SDATA)
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if(s->type != SBSS)
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continue;
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t = s->value;
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if(t == 0) {
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diag("%s: no size", s->name);
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t = 1;
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}
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t = rnd(t, 4);;
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s->value = t;
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if(t > MINSIZ)
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continue;
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s->value = datsize;
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datsize += t;
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s->type = SDATA1;
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}
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/* allocate the rest of the data */
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for(i=0; i<NHASH; i++)
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for(s = hash[i]; s != S; s = s->link) {
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if(s->type != SDATA) {
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if(s->type == SDATA1)
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s->type = SDATA;
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continue;
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}
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t = s->value;
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s->value = datsize;
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datsize += t;
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}
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if(debug['j']) {
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/*
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* pad data with bss that fits up to next
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* 8k boundary, then push data to 8k
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*/
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u = rnd(datsize, 8192);
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u -= datsize;
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for(i=0; i<NHASH; i++)
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for(s = hash[i]; s != S; s = s->link) {
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if(s->type != SBSS)
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continue;
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t = s->value;
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if(t > u)
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continue;
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u -= t;
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s->value = datsize;
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s->type = SDATA;
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datsize += t;
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}
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datsize += u;
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}
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/* now the bss */
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bsssize = 0;
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for(i=0; i<NHASH; i++)
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for(s = hash[i]; s != S; s = s->link) {
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if(s->type != SBSS)
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continue;
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t = s->value;
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s->value = bsssize + datsize;
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bsssize += t;
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}
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xdefine("bdata", SDATA, 0L);
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xdefine("edata", SDATA, datsize);
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xdefine("end", SBSS, datsize+bsssize);
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}
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Prog*
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brchain(Prog *p)
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{
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int i;
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for(i=0; i<20; i++) {
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if(p == P || p->as != ABRA)
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return p;
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p = p->pcond;
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}
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return P;
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}
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void
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follow(void)
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{
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Prog *p;
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long o;
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Sym *s;
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if(debug['v'])
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Bprint(&bso, "%5.2f follow\n", cputime());
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Bflush(&bso);
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firstp = prg();
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lastp = firstp;
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xfol(textp);
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lastp->link = P;
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firstp = firstp->link;
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o = 0; /* set */
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for(p = firstp; p != P; p = p->link) {
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if(p->as == ATEXT)
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curtext = p;
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if(p->as == ABCASE) { /* initialization for dodata */
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s = p->from.sym;
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if(s->type == SBSS)
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s->type = SDATA;
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if(s->type != SDATA)
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diag("BCASE of non-data: %s in %s\n%P",
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s->name, TNAME, p);
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}
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p->stkoff = -1; /* initialization for stkoff */
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if(p->as == ATEXT) {
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p->stkoff = 0;
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o = p->to.offset;
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continue;
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}
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if(p->as == AADJSP && p->from.offset == 0) {
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p->stkoff = o;
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continue;
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}
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}
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}
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void
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xfol(Prog *p)
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{
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Prog *q;
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int i;
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enum as a;
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loop:
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if(p == P)
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return;
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if(p->as == ATEXT)
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curtext = p;
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if(p->as == ABRA)
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if((q = p->pcond) != P) {
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p->mark = 1;
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p = q;
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if(p->mark == 0)
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goto loop;
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}
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if(p->mark) {
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/* copy up to 4 instructions to avoid branch */
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for(i=0,q=p; i<4; i++,q=q->link) {
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if(q == P)
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break;
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if(q == lastp)
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break;
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a = q->as;
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if(a == ANOP) {
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i--;
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continue;
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}
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if(a == ABRA || a == ARTS || a == ARTE)
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break;
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if(q->pcond == P || q->pcond->mark)
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continue;
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if(a == ABSR || a == ABCASE || a == ADBF)
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continue;
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for(;;) {
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if(p->as == ANOP) {
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p = p->link;
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continue;
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}
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q = copyp(p);
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p = p->link;
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q->mark = 1;
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lastp->link = q;
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lastp = q;
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if(q->as != a || q->pcond == P || q->pcond->mark)
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continue;
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q->as = relinv(q->as);
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p = q->pcond;
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q->pcond = q->link;
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q->link = p;
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xfol(q->link);
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p = q->link;
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if(p->mark)
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return;
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goto loop;
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}
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} /* */
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q = prg();
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q->as = ABRA;
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q->line = p->line;
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q->to.type = D_BRANCH;
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q->to.offset = p->pc;
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q->pcond = p;
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p = q;
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}
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p->mark = 1;
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lastp->link = p;
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lastp = p;
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a = p->as;
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if(a == ARTS || a == ABRA || a == ARTE)
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return;
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if(p->pcond != P)
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if(a != ABSR) {
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q = brchain(p->link);
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if(q != P && q->mark)
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if(a != ABCASE && a != ADBF) {
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p->as = relinv(a);
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p->link = p->pcond;
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p->pcond = q;
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}
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xfol(p->link);
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q = brchain(p->pcond);
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if(q->mark) {
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p->pcond = q;
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return;
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}
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p = q;
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goto loop;
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}
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p = p->link;
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goto loop;
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}
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int
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relinv(int a)
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{
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switch(a) {
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case ABEQ: return ABNE;
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case ABNE: return ABEQ;
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case ABLE: return ABGT;
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case ABLS: return ABHI;
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case ABLT: return ABGE;
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case ABMI: return ABPL;
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case ABGE: return ABLT;
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case ABPL: return ABMI;
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case ABGT: return ABLE;
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case ABHI: return ABLS;
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case ABCS: return ABCC;
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case ABCC: return ABCS;
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case AFBEQ: return AFBNE;
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case AFBF: return AFBT;
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case AFBGE: return AFBLT;
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case AFBGT: return AFBLE;
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case AFBLE: return AFBGT;
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case AFBLT: return AFBGE;
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case AFBNE: return AFBEQ;
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case AFBT: return AFBF;
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}
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diag("unknown relation: %s in %s", anames[a], TNAME);
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return a;
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}
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void
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patch(void)
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{
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long c;
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Prog *p, *q;
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Sym *s;
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long vexit;
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if(debug['v'])
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Bprint(&bso, "%5.2f mkfwd\n", cputime());
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Bflush(&bso);
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mkfwd();
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if(debug['v'])
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Bprint(&bso, "%5.2f patch\n", cputime());
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Bflush(&bso);
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s = lookup("exit", 0);
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vexit = s->value;
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for(p = firstp; p != P; p = p->link) {
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if(p->as == ATEXT)
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curtext = p;
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if((p->as == ABSR || p->as == ARTS) && p->to.sym != S) {
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s = p->to.sym;
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if(s->type != STEXT) {
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diag("undefined: %s in %s", s->name, TNAME);
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s->type = STEXT;
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s->value = vexit;
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}
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p->to.offset = s->value;
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p->to.type = D_BRANCH;
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}
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if(p->to.type != D_BRANCH)
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continue;
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c = p->to.offset;
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for(q = firstp; q != P;) {
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if(q->forwd != P)
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if(c >= q->forwd->pc) {
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q = q->forwd;
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continue;
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}
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if(c == q->pc)
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break;
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q = q->link;
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}
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if(q == P) {
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diag("branch out of range in %s\n%P", TNAME, p);
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p->to.type = D_NONE;
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}
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p->pcond = q;
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}
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for(p = firstp; p != P; p = p->link) {
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if(p->as == ATEXT)
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curtext = p;
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p->mark = 0; /* initialization for follow */
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if(p->pcond != P) {
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p->pcond = brloop(p->pcond);
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if(p->pcond != P)
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if(p->to.type == D_BRANCH)
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p->to.offset = p->pcond->pc;
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}
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}
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}
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#define LOG 5
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void
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mkfwd(void)
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{
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Prog *p;
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int i;
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long dwn[LOG], cnt[LOG];
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Prog *lst[LOG];
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for(i=0; i<LOG; i++) {
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if(i == 0)
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cnt[i] = 1; else
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cnt[i] = LOG * cnt[i-1];
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dwn[i] = 1;
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lst[i] = P;
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}
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i = 0;
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for(p = firstp; p != P; p = p->link) {
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if(p->as == ATEXT)
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curtext = p;
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i--;
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if(i < 0)
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i = LOG-1;
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p->forwd = P;
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dwn[i]--;
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if(dwn[i] <= 0) {
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dwn[i] = cnt[i];
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if(lst[i] != P)
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lst[i]->forwd = p;
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lst[i] = p;
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}
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}
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}
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Prog*
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brloop(Prog *p)
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{
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int c;
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Prog *q;
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c = 0;
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for(q = p; q != P; q = q->pcond) {
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if(q->as != ABRA)
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break;
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c++;
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if(c >= 5000)
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return P;
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}
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return q;
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}
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void
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dostkoff(void)
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{
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Prog *p, *q;
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long s, t;
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int a;
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Optab *o;
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if(debug['v'])
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Bprint(&bso, "%5.2f stkoff\n", cputime());
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Bflush(&bso);
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s = 0;
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for(p = firstp; p != P; p = p->link) {
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if(p->as == ATEXT) {
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curtext = p;
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s = p->to.offset;
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if(s == 0)
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continue;
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p = appendp(p);
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p->as = AADJSP;
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p->from.type = D_CONST;
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p->from.offset = s;
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p->stkoff = 0;
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continue;
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}
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for(q = p; q != P; q = q->pcond) {
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if(q->as == ATEXT)
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break;
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if(q->stkoff >= 0)
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if(q->stkoff != s)
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diag("stack offset %ld is %ld sb %ld in %s\n%P",
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q->pc, q->stkoff, s, TNAME, p);
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q->stkoff = s;
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}
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o = &optab[p->as];
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if(p->to.type == D_TOS)
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s -= o->dstsp;
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if(p->from.type == D_TOS)
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s -= o->srcsp;
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if(p->as == AADJSP)
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s += p->from.offset;
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if(p->as == APEA)
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s += 4;
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for(q = p->link; q != P; q = q->pcond) {
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if(q->as == ATEXT) {
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q = P;
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break;
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}
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if(q->stkoff >= 0)
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break;
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}
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if(q == P || q->stkoff == s)
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continue;
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if(p->as == ABRA || p->as == ARTS || p->as == ARTE) {
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s = q->stkoff;
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continue;
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}
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if(p->link->as == ABCASE)
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diag("BCASE with stack offset in %s", TNAME);
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t = q->stkoff - s;
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s = q->stkoff;
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p = appendp(p);
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p->as = AADJSP;
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p->stkoff = s - t;
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p->from.type = D_CONST;
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p->from.offset = t;
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}
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for(p = firstp; p != P; p = p->link) {
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if(p->as == ATEXT)
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curtext = p;
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a = p->from.type & D_MASK;
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if(a == D_AUTO)
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p->from.offset += p->stkoff;
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if(a == D_PARAM)
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p->from.offset += p->stkoff + 4;
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a = p->to.type & D_MASK;
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if(a == D_AUTO)
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p->to.offset += p->stkoff;
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if(a == D_PARAM)
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p->to.offset += p->stkoff + 4;
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if(p->as != ARTS)
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continue;
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if(p->stkoff == 0)
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continue;
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q = p;
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p = appendp(p);
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p->as = ARTS;
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p->stkoff = 0;
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q->as = AADJSP;
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q->from.type = D_CONST;
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q->from.offset = -q->stkoff;
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}
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}
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long
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atolwhex(char *s)
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{
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long n;
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int f;
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n = 0;
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f = 0;
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while(*s == ' ' || *s == '\t')
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s++;
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if(*s == '-' || *s == '+') {
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if(*s++ == '-')
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f = 1;
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while(*s == ' ' || *s == '\t')
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s++;
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}
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if(s[0]=='0' && s[1]){
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if(s[1]=='x' || s[1]=='X'){
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s += 2;
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for(;;){
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if(*s >= '0' && *s <= '9')
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n = n*16 + *s++ - '0';
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else if(*s >= 'a' && *s <= 'f')
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n = n*16 + *s++ - 'a' + 10;
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else if(*s >= 'A' && *s <= 'F')
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n = n*16 + *s++ - 'A' + 10;
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else
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break;
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}
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} else
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while(*s >= '0' && *s <= '7')
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n = n*8 + *s++ - '0';
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} else
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while(*s >= '0' && *s <= '9')
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n = n*10 + *s++ - '0';
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if(f)
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n = -n;
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return n;
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}
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void
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undef(void)
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{
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int i;
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Sym *s;
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for(i=0; i<NHASH; i++)
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for(s = hash[i]; s != S; s = s->link)
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if(s->type == SXREF)
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diag("%s: not defined", s->name);
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}
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