gc: use more Go-like names for methods

Fixes #991.

R=ken2
CC=golang-dev
https://golang.org/cl/4819049

src/cmd/gc/dcl.c

@@ -1079,7 +1079,10 @@ methodsym(Sym *nsym, Type *t0, int iface)
 		if(t0->width < types[tptr]->width)
 			suffix = "·i";
 	}
-	p = smprint("%#hT·%s%s", t0, nsym->name, suffix);
+	if(t0->sym == S && isptr[t0->etype])
+		p = smprint("(%#hT).%s%s", t0, nsym->name, suffix);
+	else
+		p = smprint("%#hT.%s%s", t0, nsym->name, suffix);
 	s = pkglookup(p, s->pkg);
 	free(p);
 	return s;
@@ -1106,14 +1109,17 @@ methodname1(Node *n, Node *t)
 	char *star;
 	char *p;
 
-	star = "";
+	star = nil;
 	if(t->op == OIND) {
 		star = "*";
 		t = t->left;
 	}
 	if(t->sym == S || isblank(n))
 		return newname(n->sym);
-	p = smprint("%s%S·%S", star, t->sym, n->sym);
+	if(star)
+		p = smprint("(%s%S).%S", star, t->sym, n->sym);
+	else
+		p = smprint("%S.%S", t->sym, n->sym);
 	n = newname(pkglookup(p, t->sym->pkg));
 	free(p);
 	return n;

src/pkg/runtime/debug/stack_test.go

@@ -23,7 +23,7 @@ func (t T) method() []byte {
 	Don't worry much about the base levels, but check the ones in our own package.
 
 		/Users/r/go/src/pkg/runtime/debug/stack_test.go:15 (0x13878)
-			*T.ptrmethod: return Stack()
+			(*T).ptrmethod: return Stack()
 		/Users/r/go/src/pkg/runtime/debug/stack_test.go:18 (0x138dd)
 			T.method: return t.ptrmethod()
 		/Users/r/go/src/pkg/runtime/debug/stack_test.go:23 (0x13920)
@@ -40,7 +40,7 @@ func TestStack(t *testing.T) {
 		t.Fatal("too few lines")
 	}
 	check(t, lines[0], "src/pkg/runtime/debug/stack_test.go")
-	check(t, lines[1], "\t*T.ptrmethod: return Stack()")
+	check(t, lines[1], "\t(*T).ptrmethod: return Stack()")
 	check(t, lines[2], "src/pkg/runtime/debug/stack_test.go")
 	check(t, lines[3], "\tT.method: return t.ptrmethod()")
 	check(t, lines[4], "src/pkg/runtime/debug/stack_test.go")

test/fixedbugs/bug350.go

+// errchk $G $D/$F.go
+
+// Copyright 2011 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 T int
+
+func (T) m() {}
+func (T) m() {} // ERROR "T[.]m redeclared"
+
+func (*T) p() {}
+func (*T) p() {} // ERROR "[(][*]T[)][.]p redeclared"