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#include "lib9.h"
#include "isa.h"
#include "interp.h"
#include "raise.h"
#include <pool.h>
#define T(r) *((void**)(R.r))
void
newstack(Prog *p)
{
int l;
Type *t;
Frame *f;
Stkext *ns;
f = T(s);
t = f->t;
if(t == nil)
t = SEXTYPE(f)->reg.TR;
f->lr = nil;
f->mr = nil;
f->fp = nil;
l = p->R.M->m->ss;
/* 16 bytes for Stkext record keeping */
if(l < t->size+16)
l = t->size+16;
ns = mallocz(l, 0);
if(ns == nil)
error(exNomem);
ns->reg.TR = t;
ns->reg.SP = nil;
ns->reg.TS = nil;
ns->reg.EX = nil;
p->R.EX = ns->stack;
p->R.TS = ns->stack + l;
p->R.SP = ns->reg.tos.fu + t->size;
p->R.FP = ns->reg.tos.fu;
memmove(p->R.FP, f, t->size);
f = (Frame*)p->R.FP;
f->t = nil;
}
void
extend(void)
{
int l;
Type *t;
Frame *f;
Stkext *ns;
t = R.s;
l = R.M->m->ss;
/* 16 bytes for Stkext record keeping */
if(l < t->size+16)
l = 2*t->size+16;
ns = mallocz(l, 0);
if(ns == nil)
error(exNomem);
ns->reg.TR = t;
ns->reg.SP = R.SP;
ns->reg.TS = R.TS;
ns->reg.EX = R.EX;
f = ns->reg.tos.fr;
f->t = nil;
f->mr = nil;
R.s = f;
R.EX = ns->stack;
R.TS = ns->stack + l;
R.SP = ns->reg.tos.fu + t->size;
if (t->np)
initmem(t, f);
}
void
unextend(Frame *f)
{
Stkext *sx;
Type *t;
sx = SEXTYPE(f);
R.SP = sx->reg.SP;
R.TS = sx->reg.TS;
R.EX = sx->reg.EX;
t = sx->reg.TR;
if (t->np)
freeptrs(f, t);
free(sx);
}
void
unframe(void)
{
Type *t;
Frame *f;
Stkext *sx;
f = (Frame*)R.FP;
t = f->t;
if(t == nil)
t = SEXTYPE(f)->reg.TR;
R.SP = R.FP+t->size;
f = T(s);
if(f->t == nil) {
sx = SEXTYPE(f);
R.TS = sx->reg.TS;
R.EX = sx->reg.EX;
free(sx);
}
}
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