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bug 135

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R=r
OCL=23646
CL=23646
This commit is contained in:
Ken Thompson 2009-01-27 18:21:03 -08:00
parent 7fa5941fad
commit 4b8e030762
2 changed files with 25 additions and 7 deletions
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1
src/cmd/gc/go.h
View File

@ -801,6 +801,7 @@ Node* chanop(Node*, int);
Node* arrayop(Node*, int);
Node* ifaceop(Type*, Node*, int);
int ifaceas(Type*, Type*);
int ifaceas1(Type*, Type*);
void ifacecheck(Type*, Type*, int);
void runifacechecks(void);
Node* convas(Node*);

23
src/cmd/gc/walk.c
View File

@ -17,6 +17,7 @@ enum
I2I,
I2I2,
T2I,
I2Isame,
};
// can this code branch reach the end
@ -500,11 +501,12 @@ loop:
walktype(r->left, Erv);
if(r->left == N)
break;
et = ifaceas(r->type, r->left->type);
et = ifaceas1(r->type, r->left->type);
switch(et) {
case I2T:
et = I2T2;
break;
case I2Isame:
case I2I:
et = I2I2;
break;
@ -2772,7 +2774,7 @@ arrayop(Node *n, int top)
* return op to use.
*/
int
ifaceas(Type *dst, Type *src)
ifaceas1(Type *dst, Type *src)
{
if(src == T || dst == T)
return Inone;
@ -2780,7 +2782,7 @@ ifaceas(Type *dst, Type *src)
if(isinter(dst)) {
if(isinter(src)) {
if(eqtype(dst, src, 0))
return Inone;
return I2Isame;
return I2I;
}
if(isnilinter(dst))
@ -2797,6 +2799,20 @@ ifaceas(Type *dst, Type *src)
return Inone;
}
/*
* treat convert T to T as noop
*/
int
ifaceas(Type *dst, Type *src)
{
int et;
et = ifaceas1(dst, src);
if(et == I2Isame)
et = Inone;
return et;
}
static char*
ifacename[] =
{
@ -2804,6 +2820,7 @@ ifacename[] =
[I2T2] = "ifaceI2T2",
[I2I] = "ifaceI2I",
[I2I2] = "ifaceI2I2",
[I2Isame] = "ifaceI2Isame",
};
Node*