ref: 4308f6e7e6586e3a27aa46c4d54c434b8533b16d
dir: /sys/src/cmd/7l/pass.c/
#include "l.h"
void
dodata(void)
{
int i, t, size;
Sym *s;
Prog *p, *p1;
long orig, orig1, v;
vlong vv;
if(debug['v'])
Bprint(&bso, "%5.2f dodata\n", cputime());
Bflush(&bso);
for(p = datap; p != P; p = p->link) {
s = p->from.sym;
if(p->as == ADYNT || p->as == AINIT)
s->value = dtype;
if(s->type == SBSS)
s->type = SDATA;
if(s->type != SDATA)
diag("initialize non-data (%d): %s\n%P",
s->type, s->name, p);
v = p->from.offset + p->reg;
if(v > s->value)
diag("initialize bounds (%ld): %s\n%P",
s->value, s->name, p);
}
/*
* pass 1
* assign 'small' variables to data segment
* (rational is that data segment is more easily
* addressed through offset on REGSB)
*/
orig = 0;
for(i=0; i<NHASH; i++)
for(s = hash[i]; s != S; s = s->link) {
t = s->type;
if(t != SDATA && t != SBSS)
continue;
v = s->value;
if(v == 0) {
diag("%s: no size", s->name);
v = 1;
}
while(v & 3)
v++;
s->value = v;
if(v > MINSIZ)
continue;
if (v >= 8)
orig = rnd(orig, 8);
s->value = orig;
orig += v;
s->type = SDATA1;
}
orig = rnd(orig, 8);
orig1 = orig;
/*
* pass 2
* assign 'data' variables to data segment
*/
for(i=0; i<NHASH; i++)
for(s = hash[i]; s != S; s = s->link) {
t = s->type;
if(t != SDATA) {
if(t == SDATA1)
s->type = SDATA;
continue;
}
v = s->value;
if (v >= 8)
orig = rnd(orig, 8);
s->value = orig;
orig += v;
s->type = SDATA1;
}
orig = rnd(orig, 8);
datsize = orig;
/*
* pass 3
* everything else to bss segment
*/
for(i=0; i<NHASH; i++)
for(s = hash[i]; s != S; s = s->link) {
if(s->type != SBSS)
continue;
v = s->value;
if (v >= 8)
orig = rnd(orig, 8);
s->value = orig;
orig += v;
}
orig = rnd(orig, 8);
bsssize = orig-datsize;
/*
* pass 4
* add literals to all large values.
* at this time:
* small data is allocated DATA
* large data is allocated DATA1
* large bss is allocated BSS
* the new literals are loaded between
* small data and large data.
*/
orig = 0;
for(p = firstp; p != P; p = p->link) {
if(p->as != AMOVQ)
continue;
if(p->from.type != D_CONST)
continue;
if(s = p->from.sym) {
t = s->type;
if(t != SDATA && t != SDATA1 && t != SBSS)
continue;
t = p->from.name;
if(t != D_EXTERN && t != D_STATIC)
continue;
v = s->value + p->from.offset;
size = 4;
if(v >= 0 && v <= 0xffff)
continue;
if(!strcmp(s->name, "setSB"))
continue;
/* size should be 19 max */
if(strlen(s->name) >= 10) /* has loader address */
snprint(literal, sizeof literal, "$%p.%llux", s, p->from.offset);
else
snprint(literal, sizeof literal, "$%s.%d.%llux", s->name, s->version, p->from.offset);
} else {
if(p->from.name != D_NONE)
continue;
if(p->from.reg != NREG)
continue;
vv = p->from.offset;
if(vv >= -0x8000LL && vv <= 0x7fff)
continue;
if(!(vv & 0xffff))
continue;
size = 8;
if (vv <= 0x7FFFFFFFLL && vv >= -0x80000000LL)
size = 4;
/* size should be 17 max */
snprint(literal, sizeof literal, "$%llux", vv);
}
s = lookup(literal, 0);
if(s->type == 0) {
s->type = SDATA;
orig = rnd(orig, size);
s->value = orig1+orig;
orig += size;
p1 = prg();
p1->line = p->line;
p1->as = ADATA;
p1->from.type = D_OREG;
p1->from.sym = s;
p1->from.name = D_EXTERN;
p1->reg = size;
p1->to = p->from;
p1->link = datap;
datap = p1;
if(debug['C'])
Bprint(&bso, "literal %P for %P\n", p1, p);
}
if(s->type != SDATA)
diag("literal not data: %s", s->name);
if (size == 4)
p->as = AMOVL;
p->from.type = D_OREG;
p->from.sym = s;
p->from.name = D_EXTERN;
p->from.offset = 0;
continue;
}
orig = rnd(orig, 8);
/*
* pass 5
* re-adjust offsets
*/
for(i=0; i<NHASH; i++)
for(s = hash[i]; s != S; s = s->link) {
t = s->type;
if(t == SBSS) {
s->value += orig;
continue;
}
if(t == SDATA1) {
s->type = SDATA;
s->value += orig;
continue;
}
}
datsize += orig;
if (debug['v'] || debug['z'])
Bprint(&bso, "datsize = %lux, bsssize = %lux\n", datsize, bsssize);
xdefine("setSB", SDATA, 0L+BIG);
xdefine("bdata", SDATA, 0L);
xdefine("edata", SDATA, datsize);
xdefine("end", SBSS, datsize+bsssize);
xdefine("etext", STEXT, 0L);
}
void
undef(void)
{
int i;
Sym *s;
for(i=0; i<NHASH; i++)
for(s = hash[i]; s != S; s = s->link)
if(s->type == SXREF)
diag("%s: not defined", s->name);
}
void
follow(void)
{
if(debug['v'])
Bprint(&bso, "%5.2f follow\n", cputime());
Bflush(&bso);
firstp = prg();
lastp = firstp;
xfol(textp);
firstp = firstp->link;
lastp->link = P;
}
void
xfol(Prog *p)
{
Prog *q, *r;
int a, i;
loop:
if(p == P)
return;
a = p->as;
if(a == ATEXT)
curtext = p;
if(a == AJMP) {
q = p->cond;
if(q != P) {
p->mark = FOLL;
p = q;
if(!(p->mark & FOLL))
goto loop;
}
}
if(p->mark & FOLL) {
for(i=0,q=p; i<4; i++,q=q->link) {
if(q == lastp)
break;
a = q->as;
if(a == ANOP) {
i--;
continue;
}
if(a == AJMP || a == ARET || a == AREI)
goto copy;
if(!q->cond || (q->cond->mark&FOLL))
continue;
if(a != ABEQ && a != ABNE)
continue;
copy:
for(;;) {
r = prg();
*r = *p;
if(!(r->mark&FOLL))
print("cant happen 1\n");
r->mark = FOLL;
if(p != q) {
p = p->link;
lastp->link = r;
lastp = r;
continue;
}
lastp->link = r;
lastp = r;
if(a == AJMP || a == ARET || a == AREI)
return;
r->as = ABNE;
if(a == ABNE)
r->as = ABEQ;
r->cond = p->link;
r->link = p->cond;
if(!(r->link->mark&FOLL))
xfol(r->link);
if(!(r->cond->mark&FOLL))
print("cant happen 2\n");
return;
}
}
a = AJMP;
q = prg();
q->as = a;
q->line = p->line;
q->to.type = D_BRANCH;
q->to.offset = p->pc;
q->cond = p;
p = q;
}
p->mark = FOLL;
lastp->link = p;
lastp = p;
if(a == AJMP || a == ARET || a == AREI)
return;
if(p->cond != P)
if(a != AJSR && p->link != P) {
xfol(p->link);
p = p->cond;
if(p == P || (p->mark&FOLL))
return;
goto loop;
}
p = p->link;
goto loop;
}
void
patch(void)
{
long c, vexit;
Prog *p, *q;
Sym *s;
int a;
if(debug['v'])
Bprint(&bso, "%5.2f patch\n", cputime());
Bflush(&bso);
mkfwd();
s = lookup("exit", 0);
vexit = s->value;
for(p = firstp; p != P; p = p->link) {
a = p->as;
if(a == ATEXT)
curtext = p;
if((a == AJSR || a == AJMP || a == ARET) &&
p->to.type != D_BRANCH && p->to.sym != S) {
s = p->to.sym;
if(s->type != STEXT) {
diag("undefined: %s\n%P", s->name, p);
s->type = STEXT;
s->value = vexit;
}
p->to.offset = s->value;
p->to.type = D_BRANCH;
}
if(p->to.type != D_BRANCH)
continue;
c = p->to.offset;
for(q = firstp; q != P;) {
if(q->forwd != P)
if(c >= q->forwd->pc) {
q = q->forwd;
continue;
}
if(c == q->pc)
break;
q = q->link;
}
if(q == P) {
diag("branch out of range %ld\n%P", c, p);
p->to.type = D_NONE;
}
p->cond = q;
}
for(p = firstp; p != P; p = p->link) {
if(p->as == ATEXT)
curtext = p;
if(p->cond != P) {
p->cond = brloop(p->cond);
if(p->cond != P)
if(p->to.type == D_BRANCH)
p->to.offset = p->cond->pc;
}
}
}
#define LOG 5
void
mkfwd(void)
{
Prog *p;
long dwn[LOG], cnt[LOG], i;
Prog *lst[LOG];
for(i=0; i<LOG; i++) {
if(i == 0)
cnt[i] = 1; else
cnt[i] = LOG * cnt[i-1];
dwn[i] = 1;
lst[i] = P;
}
i = 0;
for(p = firstp; p != P; p = p->link) {
if(p->as == ATEXT)
curtext = p;
i--;
if(i < 0)
i = LOG-1;
p->forwd = P;
dwn[i]--;
if(dwn[i] <= 0) {
dwn[i] = cnt[i];
if(lst[i] != P)
lst[i]->forwd = p;
lst[i] = p;
}
}
}
Prog*
brloop(Prog *p)
{
Prog *q;
int c;
for(c=0; p!=P;) {
if(p->as != AJMP)
return p;
q = p->cond;
if(q <= p) {
c++;
if(q == p || c > 50)
break;
}
p = q;
}
return P;
}
long
atolwhex(char *s)
{
long n;
int f;
n = 0;
f = 0;
while(*s == ' ' || *s == '\t')
s++;
if(*s == '-' || *s == '+') {
if(*s++ == '-')
f = 1;
while(*s == ' ' || *s == '\t')
s++;
}
if(s[0]=='0' && s[1]){
if(s[1]=='x' || s[1]=='X'){
s += 2;
for(;;){
if(*s >= '0' && *s <= '9')
n = n*16 + *s++ - '0';
else if(*s >= 'a' && *s <= 'f')
n = n*16 + *s++ - 'a' + 10;
else if(*s >= 'A' && *s <= 'F')
n = n*16 + *s++ - 'A' + 10;
else
break;
}
} else
while(*s >= '0' && *s <= '7')
n = n*8 + *s++ - '0';
} else
while(*s >= '0' && *s <= '9')
n = n*10 + *s++ - '0';
if(f)
n = -n;
return n;
}
long
rnd(long v, long r)
{
long c;
if(r <= 0)
return v;
v += r - 1;
c = v % r;
if(c < 0)
c += r;
v -= c;
return v;
}