ref: fe1eb39db7ae6904924f3ab1f6f9b34416f2eb1b
dir: /sys/src/cmd/2l/span.c/
#include "l.h"
void
span(void)
{
Prog *p, *q;
long v, c, idat;
Optab *o;
int m, n;
xdefine("etext", STEXT, 0L);
xdefine("a6base", STEXT, 0L);
idat = INITDAT;
for(p = firstp; p != P; p = p->link) {
if(p->as == ATEXT)
curtext = p;
n = 0;
if((q = p->pcond) != P)
if(q->back != 2)
n = 1;
p->back = n;
if(p->as == AADJSP) {
p->to.type = D_A0+7;
v = -p->from.offset;
p->from.offset = v;
if((v < -8 && v >= -32768L) || (v > 8 && v < 32768L)) {
p->as = ALEA;
p->from.type = I_INDIR | (D_A0+7);
continue;
}
p->as = AADDL;
if(v < 0) {
p->as = ASUBL;
v = -v;
p->from.offset = v;
}
if(v >= 0 && v <= 8)
p->from.type = D_QUICK;
if(v == 0)
p->as = ANOP;
}
}
n = 0;
start:
if(debug['v'])
Bprint(&bso, "%5.2f span\n", cputime());
Bflush(&bso);
c = INITTEXT;
for(p = firstp; p != P; p = p->link) {
if(p->as == ATEXT)
curtext = p;
o = &optab[p->as];
p->pc = c;
m = mmsize[o->optype];
if(m == 0) {
if(p->as == AWORD)
m = 2;
if(p->as == ALONG)
m = 4;
p->mark = m;
c += m;
continue;
}
if(p->from.type != D_NONE)
m += andsize(p, &p->from);
if(p->to.type == D_BRANCH) {
if(p->pcond == P)
p->pcond = p;
c += m;
if(m == 2)
m |= 0100;
p->mark = m;
continue;
}
if(p->to.type != D_NONE)
m += andsize(p, &p->to);
p->mark = m;
c += m;
}
loop:
n++;
if(debug['v'])
Bprint(&bso, "%5.2f span %d\n", cputime(), n);
Bflush(&bso);
if(n > 60) {
diag("span must be looping");
errorexit();
}
c = INITTEXT;
for(p = firstp; p != P; p = p->link) {
if(p->as == ATEXT)
curtext = p;
if((m = p->mark) & 0100) {
q = p->pcond;
v = q->pc - 2;
if(p->back)
v -= c;
else
v -= p->pc;
p->pc = c;
if(v < -32768L || v >= 32768L) {
if(p->as == ABSR && q->pc < 32768L && q->pc >= 0)
c += 4;
else
c += 6;
} else
if(v < -128 || v >= 128)
c += 4;
else
if(v == 0) {
c += 4;
p->mark = 4;
} else
c += 2;
continue;
}
p->pc = c;
c += m;
}
if(c != textsize) {
textsize = c;
goto loop;
}
if(INITRND)
INITDAT = rnd(c, INITRND);
if(INITDAT != idat) {
idat = INITDAT;
goto start;
}
xdefine("etext", STEXT, c);
xdefine("a6base", STEXT, INITDAT+A6OFFSET);
if(debug['v'])
Bprint(&bso, "etext = %lux\n", c);
Bflush(&bso);
for(p = textp; p != P; p = p->pcond)
p->from.sym->value = p->pc;
textsize = c - INITTEXT;
}
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;
}
if(s->type == STEXT && s->value == 0)
s->value = v;
}
int
andsize(Prog *p, Adr *ap)
{
int t, n;
long v;
Optab *o;
t = ap->type;
if(ap->index != D_NONE) {
n = 2;
v = ap->displace;
if(v != 0) {
n += 2;
if(v < -32768L || v >= 32768L)
n += 2;
}
switch(t) {
default:
v = ap->offset;
break;
case D_STATIC:
case D_EXTERN:
if(ap->sym->type == STEXT)
return n+4; /* see below */
v = ap->sym->value + ap->offset - A6OFFSET;
if(debug['6'])
v += INITDAT + A6OFFSET;
}
if(v != 0) {
n += 2;
if(v < -32768L || v >= 32768L)
n += 2;
}
return n;
}
n = simple[t];
if(n != 0177) {
v = ap->offset;
if(v == 0)
return 0;
if((n&070) != 020) /* D_INDIR */
return 0;
if(v == 0)
return 0;
if(v < -32768L || v >= 32768L)
return 6; /* switch to index1 mode */
return 2;
}
if((t&I_MASK) == I_ADDR)
t = D_CONST;
switch(t) {
default:
return 0;
case D_STACK:
case D_AUTO:
case D_PARAM:
v = ap->offset;
if(v == 0)
return 0;
if(v < -32768L || v >= 32768L)
return 6; /* switch to index1 mode */
return 2;
case I_INDIR|D_CONST:
v = ap->offset;
goto adr;
case D_STATIC:
case D_EXTERN:
if(ap->sym->type == STEXT)
return 4; /* too slow to get back into namelist */
v = ap->sym->value + ap->offset - A6OFFSET;
if(debug['6']) {
v += INITDAT + A6OFFSET;
goto adr;
}
if(v == 0)
return 0;
adr:
if(v < -32768L || v >= 32768L)
return 4;
return 2;
case D_CONST:
case D_FCONST:
o = &optab[p->as];
if(ap == &(p->from))
return o->srcsp;
return o->dstsp;
case D_CCR:
case D_SR:
if(p->as == AMOVW)
return 0;
return 2;
case D_USP:
t = p->from.type;
if(t >= D_A0 && t <= D_A0+8)
return 0;
t = p->to.type;
if(t >= D_A0 && t <= D_A0+8)
return 0;
case D_SFC:
case D_DFC:
case D_CACR:
case D_VBR:
case D_CAAR:
case D_MSP:
case D_ISP:
case D_FPCR:
case D_FPSR:
case D_FPIAR:
case D_TC:
case D_ITT0:
case D_ITT1:
case D_DTT0:
case D_DTT1:
case D_MMUSR:
case D_URP:
case D_SRP:
return 2;
}
}
void
putsymb(Sym *s, int t, long v)
{
int i, f;
char *n;
n = s->name;
if(t == 'f')
n++;
lput(v);
if(s->version)
t += 'a' - 'A';
CPUT(t+0x80); /* 0x80 is variable length */
if(t == 'Z' || t == 'z') {
CPUT(n[0]);
for(i=1; n[i] != 0 || n[i+1] != 0; i += 2) {
CPUT(n[i]);
CPUT(n[i+1]);
}
CPUT(0);
CPUT(0);
i++;
}
else {
for(i=0; n[i]; i++)
CPUT(n[i]);
CPUT(0);
}
symsize += 4 + 1 + i + 1;
if(debug['n']) {
if(t == 'z' || t == 'Z') {
Bprint(&bso, "%c %.8lux ", t, v);
for(i=1; n[i] != 0 || n[i+1] != 0; i+=2) {
f = ((n[i]&0xff) << 8) | (n[i+1]&0xff);
Bprint(&bso, "/%x", f);
}
Bprint(&bso, "\n");
return;
}
if(s->version)
Bprint(&bso, "%c %.8lux %s<%d>\n", t, v, n, s->version);
else
Bprint(&bso, "%c %.8lux %s\n", t, v, n);
}
}
void
asmsym(void)
{
Prog *p;
Auto *a;
Sym *s;
int h;
s = lookup("etext", 0);
if(s->type == STEXT)
putsymb(s, 'T', s->value);
s = lookup("a6base", 0);
if(s->type == STEXT)
putsymb(s, 'D', s->value);
for(h=0; h<NHASH; h++)
for(s=hash[h]; s!=S; s=s->link)
switch(s->type) {
case SDATA:
putsymb(s, 'D', s->value+INITDAT);
continue;
case SBSS:
putsymb(s, 'B', s->value+INITDAT);
continue;
case SFILE:
putsymb(s, 'f', s->value);
continue;
}
for(p=textp; p!=P; p=p->pcond) {
s = p->from.sym;
if(s->type != STEXT)
continue;
/* filenames first */
for(a=p->to.autom; a; a=a->link)
if(a->type == D_FILE)
putsymb(a->asym, 'z', a->aoffset);
else
if(a->type == D_FILE1)
putsymb(a->asym, 'Z', a->aoffset);
putsymb(s, 'T', s->value);
/* auto and param after */
for(a=p->to.autom; a; a=a->link)
if(a->type == D_AUTO)
putsymb(a->asym, 'a', -a->aoffset);
else
if(a->type == D_PARAM)
putsymb(a->asym, 'p', a->aoffset);
}
if(debug['v'] || debug['n'])
Bprint(&bso, "symsize = %lud\n", symsize);
Bflush(&bso);
}
#define MINLC 2
void
asmsp(void)
{
long oldpc, oldsp;
Prog *p;
int s;
long v;
oldpc = INITTEXT;
oldsp = 0;
for(p = firstp; p != P; p = p->link) {
if(p->stkoff == oldsp || p->as == ATEXT || p->as == ANOP) {
if(p->as == ATEXT)
curtext = p;
if(debug['G'])
Bprint(&bso, "%6lux %4ld%P\n",
p->pc, p->stkoff, p);
continue;
}
if(debug['G'])
Bprint(&bso, "\t\t%6ld", spsize);
v = (p->pc - oldpc) / MINLC;
while(v) {
s = 127;
if(v < 127)
s = v;
CPUT(s+128); /* 129-255 +pc */
if(debug['G'])
Bprint(&bso, " pc+%d*2(%d)", s, s+128);
v -= s;
spsize++;
}
v = p->stkoff - oldsp;
oldsp = p->stkoff;
oldpc = p->pc + MINLC;
if(v & 3 || v > 64L*4L || v < -64L*4L) {
CPUT(0); /* 0 vvvv +sp */
lput(v);
if(debug['G']) {
if(v > 0)
Bprint(&bso, " sp+%ld*1(%d,%ld)\n",
v, 0, v);
else
Bprint(&bso, " sp%ld*1(%d,%ld)\n",
v, 0, v);
Bprint(&bso, "%6lux %4ld%P\n",
p->pc, p->stkoff, p);
}
spsize += 5;
continue;
}
s = v/4;
if(s > 0) {
CPUT(0+s); /* 1-64 +sp */
if(debug['G']) {
Bprint(&bso, " sp+%d*4(%d)\n", s, 0+s);
Bprint(&bso, "%6lux %4ld%P\n",
p->pc, p->stkoff, p);
}
} else {
CPUT(64-s); /* 65-128 -sp */
if(debug['G']) {
Bprint(&bso, " sp%d*4(%d)\n", s, 64-s);
Bprint(&bso, "%6lux %4ld%P\n",
p->pc, p->stkoff, p);
}
}
spsize++;
}
while(spsize & 1) {
s = 129;
CPUT(s);
spsize++;
}
if(debug['v'] || debug['G'])
Bprint(&bso, "stsize = %ld\n", spsize);
Bflush(&bso);
}
void
asmlc(void)
{
long oldpc, oldlc;
Prog *p;
long v, s;
oldpc = INITTEXT;
oldlc = 0;
for(p = firstp; p != P; p = p->link) {
if(p->line == oldlc || p->as == ATEXT || p->as == ANOP) {
if(p->as == ATEXT)
curtext = p;
if(debug['L'])
Bprint(&bso, "%6lux %P\n",
p->pc, p);
continue;
}
if(debug['L'])
Bprint(&bso, "\t\t%6ld", lcsize);
v = (p->pc - oldpc) / MINLC;
while(v) {
s = 127;
if(v < 127)
s = v;
CPUT(s+128); /* 129-255 +pc */
if(debug['L'])
Bprint(&bso, " pc+%ld*%d(%ld)", s, MINLC, s+128);
v -= s;
lcsize++;
}
s = p->line - oldlc;
oldlc = p->line;
oldpc = p->pc + MINLC;
if(s > 64 || s < -64) {
CPUT(0); /* 0 vv +lc */
CPUT(s>>24);
CPUT(s>>16);
CPUT(s>>8);
CPUT(s);
if(debug['L']) {
if(s > 0)
Bprint(&bso, " lc+%ld(%d,%ld)\n",
s, 0, s);
else
Bprint(&bso, " lc%ld(%d,%ld)\n",
s, 0, s);
Bprint(&bso, "%6lux %P\n",
p->pc, p);
}
lcsize += 5;
continue;
}
if(s > 0) {
CPUT(0+s); /* 1-64 +lc */
if(debug['L']) {
Bprint(&bso, " lc+%ld(%ld)\n", s, 0+s);
Bprint(&bso, "%6lux %P\n",
p->pc, p);
}
} else {
CPUT(64-s); /* 65-128 -lc */
if(debug['L']) {
Bprint(&bso, " lc%ld(%ld)\n", s, 64-s);
Bprint(&bso, "%6lux %P\n",
p->pc, p);
}
}
lcsize++;
}
while(lcsize & 1) {
s = 129;
CPUT(s);
lcsize++;
}
if(debug['v'] || debug['L'])
Bprint(&bso, "lcsize = %ld\n", lcsize);
Bflush(&bso);
}