ref: 63f9a4fda36f916e543c8f3ea117b31c194a4db7
dir: /sys/src/cmd/7l/span.c/
#include "l.h"
void
span(void)
{
Prog *p;
Sym *setext;
Optab *o;
int m;
long c;
if(debug['v'])
Bprint(&bso, "%5.2f span\n", cputime());
Bflush(&bso);
c = INITTEXT;
for(p = firstp; p != P; p = p->link) {
p->pc = c;
o = oplook(p);
m = o->size;
if(m == 0) {
if(p->as == ATEXT) {
curtext = p;
autosize = p->to.offset + 8;
if(p->from.sym != S)
p->from.sym->value = c;
continue;
}
diag("zero-width instruction\n%P", p);
continue;
}
c += m;
}
c = rnd(c, 8);
setext = lookup("etext", 0);
if(setext != S) {
setext->value = c;
textsize = c - INITTEXT;
}
if(INITRND)
INITDAT = rnd(c, INITRND);
if(debug['v'])
Bprint(&bso, "tsize = %lux\n", textsize);
Bflush(&bso);
}
void
xdefine(char *p, int t, long v)
{
Sym *s;
s = lookup(p, 0);
if(s->type == 0 || s->type == SXREF) {
s->type = t;
s->value = v;
}
}
vlong /* BUG? */
regoff(Adr *a)
{
offset = 0;
aclass(a);
return offset;
}
/*
* note that we can't generate every 32 bit constant with MOVQA+MOVQAH, hence the
* comparison with 0x7fff8000. offset >= this value gets incorrectly sign extended in
* the 64 bit register.
*/
aclass(Adr *a)
{
Sym *s;
int t;
switch(a->type) {
case D_NONE:
return C_NONE;
case D_REG:
return C_REG;
case D_FREG:
return C_FREG;
case D_FCREG:
return C_FCREG;
case D_PREG:
return C_PREG;
case D_PCC:
return C_PCC;
case D_OREG:
switch(a->name) {
case D_EXTERN:
case D_STATIC:
if(a->sym == 0) {
print("null sym external\n");
print("%D\n", a);
return C_GOK;
}
t = a->sym->type;
if(t == 0 || t == SXREF) {
diag("undefined external: %s in %s",
a->sym->name, TNAME);
a->sym->type = SDATA;
}
offset = a->sym->value + a->offset - BIG;
if(offset >= -BIG && offset < BIG)
return C_SEXT;
if (offset >= -0x80000000LL && offset < 0x7fff8000LL)
return C_LEXT;
badoff:
diag("offset out of range: %#llux", offset);
return C_GOK;
case D_AUTO:
offset = autosize + a->offset;
if(offset >= -BIG && offset < BIG)
return C_SAUTO;
if (offset >= -0x80000000LL && offset < 0x7fff8000LL)
return C_LAUTO;
goto badoff;
case D_PARAM:
offset = autosize + a->offset + 8L;
if(offset >= -BIG && offset < BIG)
return C_SAUTO;
if (offset >= -0x80000000LL && offset < 0x7fff8000LL)
return C_LAUTO;
goto badoff;
case D_NONE:
offset = a->offset;
if(offset == 0)
return C_ZOREG;
if(offset >= -BIG && offset < BIG)
return C_SOREG;
if (offset >= -0x80000000LL && offset < 0x7fff8000LL)
return C_LOREG;
goto badoff;
}
return C_GOK;
case D_CONST:
switch(a->name) {
case D_NONE:
offset = a->offset;
if(offset > 0) {
if(offset <= 0xffLL)
return C_BCON;
if(offset <= 0x7fffLL)
return C_SCON;
if((offset & 0xffffLL) == 0 && offset <= 0x7fff0000LL)
return C_UCON;
if (offset < 0x7fff8000LL)
return C_LCON;
return C_QCON;
}
if(offset == 0)
return C_ZCON;
if(offset >= -0x100LL)
return C_NCON;
if(offset >= -0x8000LL)
return C_SCON;
if((offset & 0xffffLL) == 0 && offset >= -0x80000000LL)
return C_UCON;
if (offset >= -0x80000000LL)
return C_LCON;
return C_QCON;
case D_EXTERN:
case D_STATIC:
s = a->sym;
if(s == 0) {
print("null sym const\n");
print("%D\n", a);
return C_GOK;
}
t = s->type;
if(t == 0 || t == SXREF) {
diag("undefined external: %s in %s",
s->name, TNAME);
s->type = SDATA;
}
if(s->type == STEXT || s->type == SLEAF) {
offset = s->value + a->offset;
return C_LCON;
}
offset = s->value + a->offset - BIG;
if (offset == 0L) {
offset = s->value + a->offset + INITDAT;
return C_LCON; /* botch */
}
if(offset >= -BIG && offset < BIG && offset != 0L)
return C_SECON;
if (offset >= -0x80000000LL && offset < 0x7fff8000L && offset != 0LL /*&& offset >= -INITDAT*/)
return C_LECON;
/*offset = s->value + a->offset + INITDAT;*/
/* if (offset >= -BIG && offset < BIG)
return C_SCON;
if (offset >= -0x80000000LL && offset < 0x7fff8000LL)
return C_LCON; */
goto badoff;
/*return C_QCON;*/
case D_AUTO:
offset = autosize + a->offset;
if(offset >= -BIG && offset < BIG)
return C_SACON;
if (offset >= -0x80000000LL && offset < 0x7fff8000LL)
return C_LACON;
goto badoff;
case D_PARAM:
offset = autosize + a->offset + 8L;
if(offset >= -BIG && offset < BIG)
return C_SACON;
if (offset >= -0x80000000LL && offset < 0x7fff8000LL)
return C_LACON;
goto badoff;
}
return C_GOK;
case D_BRANCH:
return C_SBRA;
}
return C_GOK;
}
Optab*
oplook(Prog *p)
{
int a1, a2, a3, r;
char *c1, *c3;
Optab *o, *e;
a1 = p->optab;
if(a1)
return optab+(a1-1);
a1 = p->from.class;
if(a1 == 0) {
a1 = aclass(&p->from) + 1;
p->from.class = a1;
}
a1--;
a3 = p->to.class;
if(a3 == 0) {
a3 = aclass(&p->to) + 1;
p->to.class = a3;
}
a3--;
a2 = C_NONE;
if(p->reg != NREG)
a2 = C_REG;
r = p->as;
o = oprange[r].start;
if(o == 0) {
a1 = opcross[repop[r]][a1][a2][a3];
if(a1) {
p->optab = a1+1;
return optab+a1;
}
o = oprange[r].stop; /* just generate an error */
}
e = oprange[r].stop;
c1 = xcmp[a1];
c3 = xcmp[a3];
for(; o<e; o++)
if(o->a2 == a2)
if(c1[o->a1])
if(c3[o->a3]) {
p->optab = (o-optab)+1;
return o;
}
diag("illegal combination %A %d %d %d (opcross %d)",
p->as, p->from.class-1, a2, a3, a1);
if(!debug['a'])
prasm(p);
o = optab;
p->optab = (o-optab)+1;
return o;
}
int
cmp(int a, int b)
{
if(a == b)
return 1;
switch(a) {
case C_QCON:
if(b == C_ZCON || b == C_BCON || b == C_NCON || b == C_SCON || b == C_UCON || b == C_LCON)
return 1;
break;
case C_LCON:
if(b == C_ZCON || b == C_BCON || b == C_NCON || b == C_SCON || b == C_UCON)
return 1;
break;
case C_UCON:
if(b == C_ZCON)
return 1;
break;
case C_SCON:
if(b == C_ZCON || b == C_BCON || b == C_NCON)
return 1;
break;
case C_BCON:
if(b == C_ZCON)
return 1;
break;
case C_LACON:
if(b == C_SACON)
return 1;
break;
case C_LBRA:
if(b == C_SBRA)
return 1;
break;
case C_LEXT:
if(b == C_SEXT)
return 1;
break;
case C_LAUTO:
if(b == C_SAUTO)
return 1;
break;
case C_REG:
/* if(b == C_ZCON)
return 1; */
break;
case C_LOREG:
if(b == C_ZOREG || b == C_SOREG)
return 1;
break;
case C_SOREG:
if(b == C_ZOREG)
return 1;
break;
}
return 0;
}
int
ocmp(void *a1, void *a2)
{
Optab *p1, *p2;
int n;
p1 = a1;
p2 = a2;
n = p1->as - p2->as;
if(n)
return n;
n = p1->a1 - p2->a1;
if(n)
return n;
n = p1->a2 - p2->a2;
if(n)
return n;
n = p1->a3 - p2->a3;
if(n)
return n;
return 0;
}
void
buildop(void)
{
int i, n, r;
for(i=0; i<32; i++)
for(n=0; n<32; n++)
xcmp[i][n] = cmp(n, i);
for(n=0; optab[n].as != AXXX; n++)
;
qsort(optab, n, sizeof(optab[0]), ocmp);
for(i=0; i<n; i++) {
r = optab[i].as;
oprange[r].start = optab+i;
while(optab[i].as == r)
i++;
oprange[r].stop = optab+i;
i--;
switch(r)
{
default:
diag("unknown op in build: %A", r);
errorexit();
case AADDQ:
oprange[AS4ADDQ] = oprange[r];
oprange[AS8ADDQ] = oprange[r];
oprange[ASUBQ] = oprange[r];
oprange[AS4SUBQ] = oprange[r];
oprange[AS8SUBQ] = oprange[r];
break;
case AADDL:
oprange[AADDLV] = oprange[r];
oprange[AS4ADDL] = oprange[r];
oprange[AS8ADDL] = oprange[r];
oprange[AADDQV] = oprange[r];
oprange[ASUBQV] = oprange[r];
oprange[ASUBL] = oprange[r];
oprange[ASUBLV] = oprange[r];
oprange[AS4SUBL] = oprange[r];
oprange[AS8SUBL] = oprange[r];
break;
case AAND:
oprange[AANDNOT] = oprange[r];
oprange[AOR] = oprange[r];
oprange[AORNOT] = oprange[r];
oprange[AXOR] = oprange[r];
oprange[AXORNOT] = oprange[r];
break;
case AMULQ:
oprange[ACMPEQ] = oprange[r];
oprange[ACMPGT] = oprange[r];
oprange[ACMPGE] = oprange[r];
oprange[ACMPUGT] = oprange[r];
oprange[ACMPUGE] = oprange[r];
oprange[ACMPBLE] = oprange[r];
oprange[ACMOVEQ] = oprange[r];
oprange[ACMOVNE] = oprange[r];
oprange[ACMOVLT] = oprange[r];
oprange[ACMOVGE] = oprange[r];
oprange[ACMOVLE] = oprange[r];
oprange[ACMOVGT] = oprange[r];
oprange[ACMOVLBS] = oprange[r];
oprange[ACMOVLBC] = oprange[r];
oprange[AMULL] = oprange[r];
oprange[AMULLV] = oprange[r];
oprange[AMULQV] = oprange[r];
oprange[AUMULH] = oprange[r];
oprange[ASLLQ] = oprange[r];
oprange[ASRLQ] = oprange[r];
oprange[ASRAQ] = oprange[r];
oprange[AEXTBL] = oprange[r];
oprange[AEXTWL] = oprange[r];
oprange[AEXTLL] = oprange[r];
oprange[AEXTQL] = oprange[r];
oprange[AEXTWH] = oprange[r];
oprange[AEXTLH] = oprange[r];
oprange[AEXTQH] = oprange[r];
oprange[AINSBL] = oprange[r];
oprange[AINSWL] = oprange[r];
oprange[AINSLL] = oprange[r];
oprange[AINSQL] = oprange[r];
oprange[AINSWH] = oprange[r];
oprange[AINSLH] = oprange[r];
oprange[AINSQH] = oprange[r];
oprange[AMSKBL] = oprange[r];
oprange[AMSKWL] = oprange[r];
oprange[AMSKLL] = oprange[r];
oprange[AMSKQL] = oprange[r];
oprange[AMSKWH] = oprange[r];
oprange[AMSKLH] = oprange[r];
oprange[AMSKQH] = oprange[r];
oprange[AZAP] = oprange[r];
oprange[AZAPNOT] = oprange[r];
break;
case ABEQ:
oprange[ABNE] = oprange[r];
oprange[ABGE] = oprange[r];
oprange[ABLE] = oprange[r];
oprange[ABGT] = oprange[r];
oprange[ABLT] = oprange[r];
break;
case AFBEQ:
oprange[AFBNE] = oprange[r];
oprange[AFBGE] = oprange[r];
oprange[AFBLE] = oprange[r];
oprange[AFBGT] = oprange[r];
oprange[AFBLT] = oprange[r];
break;
case AMOVQ:
oprange[AMOVL] = oprange[r];
oprange[AMOVLU] = oprange[r];
oprange[AMOVQU] = oprange[r];
oprange[AMOVA] = oprange[r];
oprange[AMOVAH] = oprange[r];
oprange[AMOVBU] = oprange[r];
oprange[AMOVWU] = oprange[r];
oprange[AMOVB] = oprange[r];
oprange[AMOVW] = oprange[r];
break;
case AMOVT:
oprange[AMOVS] = oprange[r];
break;
case AADDT:
oprange[AADDS] = oprange[r];
oprange[ACMPTEQ] = oprange[r];
oprange[ACMPTGT] = oprange[r];
oprange[ACMPTGE] = oprange[r];
oprange[ACMPTUN] = oprange[r];
oprange[ADIVS] = oprange[r];
oprange[ADIVT] = oprange[r];
oprange[AMULS] = oprange[r];
oprange[AMULT] = oprange[r];
oprange[ASUBS] = oprange[r];
oprange[ASUBT] = oprange[r];
oprange[ACPYS] = oprange[r];
oprange[ACPYSN] = oprange[r];
oprange[ACPYSE] = oprange[r];
oprange[ACVTLQ] = oprange[r];
oprange[ACVTQL] = oprange[r];
oprange[AFCMOVEQ] = oprange[r];
oprange[AFCMOVNE] = oprange[r];
oprange[AFCMOVLT] = oprange[r];
oprange[AFCMOVGE] = oprange[r];
oprange[AFCMOVLE] = oprange[r];
oprange[AFCMOVGT] = oprange[r];
break;
case ACVTTQ:
oprange[ACVTQT] = oprange[r];
oprange[ACVTTS] = oprange[r];
oprange[ACVTQS] = oprange[r];
break;
case AJMP:
case AJSR:
break;
case ACALL_PAL:
break;
case AMOVQL:
oprange[AMOVLL] = oprange[r];
break;
case AMOVQC:
oprange[AMOVLC] = oprange[r];
break;
case AMOVQP:
oprange[AMOVLP] = oprange[r];
break;
case AREI:
oprange[AMB] = oprange[r];
oprange[ATRAPB] = oprange[r];
break;
case AFETCH:
oprange[AFETCHM] = oprange[r];
break;
case AWORD:
case ATEXT:
break;
}
}
}
void
buildrep(int x, int as)
{
Opcross *p;
Optab *e, *s, *o;
int a1, a2, a3, n;
if(C_NONE != 0 || C_REG != 1 || C_GOK >= 32 || x >= nelem(opcross)) {
diag("assumptions fail in buildrep");
errorexit();
}
repop[as] = x;
p = (opcross + x);
s = oprange[as].start;
e = oprange[as].stop;
for(o=e-1; o>=s; o--) {
n = o-optab;
for(a2=0; a2<2; a2++) {
if(a2) {
if(o->a2 == C_NONE)
continue;
} else
if(o->a2 != C_NONE)
continue;
for(a1=0; a1<32; a1++) {
if(!xcmp[a1][o->a1])
continue;
for(a3=0; a3<32; a3++)
if(xcmp[a3][o->a3])
(*p)[a1][a2][a3] = n;
}
}
}
oprange[as].start = 0;
}