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gc: new, less strict bool rules

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R=ken2
CC=golang-dev
https://golang.org/cl/5688064
This commit is contained in:
Russ Cox 2012-02-22 00:29:37 -05:00
parent 6c7daca236
commit e29d3dfc49
5 changed files with 45 additions and 7 deletions
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21
src/cmd/gc/const.c
View File

@ -87,6 +87,8 @@ convlit1(Node **np, Type *t, int explicit)
switch(n->op) {
default:
if(n->type == idealbool)
n->type = types[TBOOL];
if(n->type->etype == TIDEAL) {
convlit(&n->left, t);
convlit(&n->right, t);
@ -1010,6 +1012,10 @@ defaultlit(Node **np, Type *t)
}
n->type = t;
return;
case ONOT:
defaultlit(&n->left, t);
n->type = n->left->type;
return;
default:
if(n->left == N) {
dump("defaultlit", n);
@ -1029,13 +1035,18 @@ defaultlit(Node **np, Type *t)
} else if(t == T && (n->left->op == OLSH || n->left->op == ORSH)) {
defaultlit(&n->right, T);
defaultlit(&n->left, n->right->type);
} else if(iscmp[n->op]) {
defaultlit2(&n->left, &n->right, 1);
} else {
defaultlit(&n->left, t);
defaultlit(&n->right, t);
}
if(n->type == idealbool || n->type == idealstring)
n->type = types[n->type->etype];
else
if(n->type == idealbool || n->type == idealstring) {
if(t != T && t->etype == n->type->etype)
n->type = t;
else
n->type = types[n->type->etype];
} else
n->type = n->left->type;
return;
}
@ -1124,6 +1135,10 @@ defaultlit2(Node **lp, Node **rp, int force)
}
if(!force)
return;
if(l->type->etype == TBOOL) {
convlit(lp, types[TBOOL]);
convlit(rp, types[TBOOL]);
}
if(isconst(l, CTCPLX) || isconst(r, CTCPLX)) {
convlit(lp, types[TCOMPLEX128]);
convlit(rp, types[TCOMPLEX128]);

12
src/cmd/gc/subr.c
View File

@ -1354,6 +1354,18 @@ assignconv(Node *n, Type *t, char *context)
if(t->etype == TBLANK)
return n;
// Convert ideal bool from comparison to plain bool
// if the next step is non-bool (like interface{}).
if(n->type == idealbool && t->etype != TBOOL) {
if(n->op == ONAME || n->op == OLITERAL) {
r = nod(OCONVNOP, n, N);
r->type = types[TBOOL];
r->typecheck = 1;
r->implicit = 1;
n = r;
}
}
if(eqtype(n->type, t))
return n;

11
src/cmd/gc/typecheck.c
View File

@ -526,7 +526,7 @@ reswitch:
t = l->type;
if(iscmp[n->op]) {
evconst(n);
t = types[TBOOL];
t = idealbool;
if(n->op != OLITERAL) {
defaultlit2(&l, &r, 1);
n->left = l;
@ -1317,6 +1317,13 @@ reswitch:
case OPRINTN:
ok |= Etop;
typechecklist(n->list, Erv | Eindir); // Eindir: address does not escape
for(args=n->list; args; args=args->next) {
// Special case for print: int constant is int64, not int.
if(isconst(args->n, CTINT))
defaultlit(&args->n, types[TINT64]);
else
defaultlit(&args->n, T);
}
goto ret;
case OPANIC:
@ -2887,6 +2894,8 @@ typecheckdef(Node *n)
}
ret:
if(n->op != OLITERAL && n->type != T && isideal(n->type))
fatal("got %T for %N", n->type, n);
if(typecheckdefstack->n != n)
fatal("typecheckdefstack mismatch");
l = typecheckdefstack;

4
src/cmd/gc/walk.c
View File

@ -1055,6 +1055,8 @@ walkexpr(Node **np, NodeList **init)
walkexpr(&r, nil);
}
typecheck(&r, Erv);
if(n->type->etype != TBOOL) fatal("cmp %T", n->type);
r->type = n->type;
n = r;
goto ret;
@ -1190,7 +1192,7 @@ walkexpr(Node **np, NodeList **init)
r = nod(OOROR, nod(ONE, nod(OITAB, n->left, N), nod(OITAB, n->right, N)), r);
typecheck(&r, Erv);
walkexpr(&r, nil);
r->type = n->type;
n = r;
goto ret;

4
test/named1.go
View File

@ -37,8 +37,8 @@ func main() {
asBool(true)
asBool(*&b)
asBool(Bool(true))
asBool(1 != 2) // ERROR "cannot use.*type bool.*as type Bool"
asBool(i < j) // ERROR "cannot use.*type bool.*as type Bool"
asBool(1 != 2) // ok now
asBool(i < j) // ok now
_, b = m[2] // ERROR "cannot .* bool.*type Bool"