add method test & fix method name bugs

R=ken,r
DELTA=86  (72 added, 9 deleted, 5 changed)
OCL=16488
CL=16488

src/cmd/gc/dcl.c

@@ -176,22 +176,15 @@ methodname(Node *n, Type *t)
 	Sym *s;
 	char buf[NSYMB];
 
+	// caller has already called ismethod to obtain t
 	if(t == T)
 		goto bad;
-
-	// method receiver must be typename or *typename
-	s = S;
-	if(t->sym != S)
-		s = t->sym;
-	if(isptr[t->etype])
-		t = t->type;
-	if(t->sym != S)
-		s = t->sym;
+	s = t->sym;
 	if(s == S)
 		goto bad;
 
 	snprint(buf, sizeof(buf), "%s_%s", s->name, n->sym->name);
-	return newname(pkglookup(buf, t->sym->opackage));
+	return newname(pkglookup(buf, s->opackage));
 
 bad:
 	yyerror("illegal <this> type: %T", t);

src/cmd/gc/go.y

@@ -1113,9 +1113,15 @@ fndcl:
 	}
 |	'(' oarg_type_list ')' new_name '(' oarg_type_list ')' fnres
 	{
+		Type *t;
+
 		b0stack = dclstack;	// mark base for fn literals
 		$$ = nod(ODCLFUNC, N, N);
-		$$->nname = methodname($4, $2->type);
+		t = ismethod($2->type);
+		if(t != T)
+			$$->nname = methodname($4, t);
+		else
+			$$->nname = $4;
 		$$->type = functype($2, $6, $8);
 		funchdr($$);
 

src/cmd/gc/walk.c

@@ -1230,7 +1230,7 @@ recv:
 	r = list(a, r);
 	goto out;
 
-recv2:	
+recv2:
 	walktype(c->right, Erv);	// chan
 
 	t = fixchan(c->right->type);
@@ -1399,6 +1399,7 @@ lookdot(Node *n, Type *f)
 	for(; f!=T; f=f->down) {
 		if(f->sym == S)
 			continue;
+	//	if(strcmp(f->sym->name, s->name) != 0)
 		if(f->sym != s)
 			continue;
 		if(r != T) {
@@ -1430,6 +1431,7 @@ walkdot(Node *n)
 	if(t == T)
 		return;
 
+	// as a structure field or pointer to structure field
 	if(isptr[t->etype]) {
 		t = t->type;
 		if(t == T)
@@ -1437,7 +1439,6 @@ walkdot(Node *n)
 		n->op = ODOTPTR;
 	}
 
-	// as a structure field
 	if(t->etype == TSTRUCT || t->etype == TINTER) {
 		f = lookdot(n->right, t->type);
 		if(f != T) {
@@ -1450,9 +1451,13 @@ walkdot(Node *n)
 		}
 	}
 
-	f = lookdot(n->right, t->method);
+	// as a method
+	f = T;
+	t = ismethod(n->left->type);
+	if(t != T)
+		f = lookdot(n->right, t->method);
 	if(f == T) {
-		yyerror("undefined DOT %S", n->right->sym);
+		yyerror("undefined DOT %S on %T", n->right->sym, n->left->type);
 		return;
 	}
 
@@ -1883,7 +1888,7 @@ fixchan(Type *tm)
 {
 	Type *t;
 
-	if(tm == T) 
+	if(tm == T)
 		goto bad;
 	t = tm->type;
 	if(t == T)
@@ -2298,7 +2303,7 @@ fixarray(Type *tm)
 bad:
 	yyerror("not an array: %lT", tm);
 	return T;
-	
+
 }
 
 Node*

test/method.go

@@ -0,0 +1,63 @@
+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+type S string
+type S1 string
+type I int
+type I1 int
+type P *int
+type P1 *int
+type T struct { x int }
+type T1 T
+
+func (s S) val() int { return 1 }
+func (s *S1) val() int { return 2 }
+func (i I) val() int { return 3 }
+func (i *I1) val() int { return 4 }
+func (p P) val() int { return 5 }
+func (p *P1) val() int { return 6 }
+//func (t T) val() int { return 7 }
+func (t *T1) val() int { return 8 }
+
+type Val interface {
+	val() int
+}
+
+func val(v Val) int {
+	return v.val()
+}
+
+func main() {
+	var s S;
+	var ps *S1;
+	var i I;
+	var pi *I1;
+	var p P;
+	var pp *P1;
+	var t T;
+	var pt *T1
+
+	if s.val() != 1 { panicln("s.val:", s.val()) }
+	if ps.val() != 2 { panicln("ps.val:", ps.val()) }
+	if i.val() != 3 { panicln("i.val:", i.val()) }
+	if pi.val() != 4 { panicln("pi.val:", pi.val()) }
+	if p.val() != 5 { panicln("p.val:", p.val()) }
+	if pp.val() != 6 { panicln("pp.val:", pp.val()) }
+//	if t.val() != 7 { panicln("t.val:", t.val()) }
+	if pt.val() != 8 { panicln("pt.val:", pt.val()) }
+
+	if val(s) != 1 { panicln("s.val:", val(s)) }
+	if val(ps) != 2 { panicln("ps.val:", val(ps)) }
+	if val(i) != 3 { panicln("i.val:", val(i)) }
+	if val(pi) != 4 { panicln("pi.val:", val(pi)) }
+	if val(p) != 5 { panicln("p.val:", val(p)) }
+	if val(pp) != 6 { panicln("pp.val:", val(pp)) }
+//	if val(t) != 7 { panicln("t.val:", val(t)) }
+	if val(pt) != 8 { panicln("pt.val:", val(pt)) }
+
+}