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T,ok = I.(T)

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R=r
OCL=18580
CL=18582
This commit is contained in:
Ken Thompson 2008-11-05 14:27:07 -08:00
parent 6f07ec721a
commit a8b56a73a4
1 changed files with 47 additions and 24 deletions
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71
src/cmd/gc/walk.c
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@ -14,8 +14,10 @@ enum
{
Inone,
I2T,
I2T2,
I2I,
T2I
I2I2,
T2I,
};
// can this code branch reach the end
@ -463,6 +465,33 @@ loop:
goto ret;
}
break;
case OCONV:
if(cl == 2 && cr == 1) {
// a,b = i.(T)
if(r->left == N)
break;
et = isandss(r->type, r->left);
switch(et) {
case I2T:
et = I2T2;
break;
case I2I:
et = I2I2;
break;
default:
et = Inone;
break;
}
if(et == Inone)
break;
r = ifaceop(r->type, r->left, et);
l = ascompatet(n->op, &n->left, &r->type, 0);
if(l != N)
indir(n, list(r, reorder2(l)));
goto ret;
}
break;
}
switch(l->op) {
@ -2667,6 +2696,15 @@ isandss(Type *lt, Node *r)
return Inone;
}
static char*
ifacename[] =
{
[I2T] = "ifaceI2T",
[I2T2] = "ifaceI2T2",
[I2I] = "ifaceI2I",
[I2I2] = "ifaceI2I2",
};
Node*
ifaceop(Type *tl, Node *n, int op)
{
@ -2678,26 +2716,7 @@ ifaceop(Type *tl, Node *n, int op)
switch(op) {
default:
fatal("ifaceop: unknown op %d\n", op);
case I2T:
// ifaceI2T(sigt *byte, iface any) (ret any);
a = n; // interface
r = a;
s = signame(tl); // sigi
if(s == S)
fatal("ifaceop: signame I2T");
a = s->oname;
a = nod(OADDR, a, N);
r = list(a, r);
on = syslook("ifaceI2T", 1);
argtype(on, tr);
argtype(on, tl);
break;
fatal("ifaceop: unknown op %O\n", op);
case T2I:
// ifaceT2I(sigi *byte, sigt *byte, elem any) (ret any);
@ -2726,22 +2745,26 @@ ifaceop(Type *tl, Node *n, int op)
break;
case I2T:
case I2T2:
case I2I:
// ifaceI2I(sigi *byte, iface any-1) (ret any-2);
case I2I2:
// iface[IT]2[IT][2](sigt *byte, iface any) (ret any[, ok bool]);
a = n; // interface
r = a;
s = signame(tl); // sigi
if(s == S)
fatal("ifaceop: signame I2I");
fatal("ifaceop: signame %d", op);
a = s->oname;
a = nod(OADDR, a, N);
r = list(a, r);
on = syslook("ifaceI2I", 1);
on = syslook(ifacename[op], 1);
argtype(on, tr);
argtype(on, tl);
break;
case OEQ: