go/internal/gccgoimporter: skip /*nointerface*/ comment

Support for methods marked with "//go:nointerface" was broken by CL
151557, based on CL 150061, which changed the scanner to stop skipping
comments.

Change-Id: I43d5e2cf51bed2dc4ed9d6136ca21aa1223e8df1
Reviewed-on: https://go-review.googlesource.com/c/152378
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>

src/go/internal/gccgoimporter/importer_test.go

@@ -89,6 +89,7 @@ var importerTests = [...]importerTest{
 	{pkgpath: "escapeinfo", name: "NewT", want: "func NewT(data []byte) *T"},
 	{pkgpath: "issue27856", name: "M", want: "type M struct{E F}"},
 	{pkgpath: "v1reflect", name: "Type", want: "type Type interface{Align() int; AssignableTo(u Type) bool; Bits() int; ChanDir() ChanDir; Elem() Type; Field(i int) StructField; FieldAlign() int; FieldByIndex(index []int) StructField; FieldByName(name string) (StructField, bool); FieldByNameFunc(match func(string) bool) (StructField, bool); Implements(u Type) bool; In(i int) Type; IsVariadic() bool; Key() Type; Kind() Kind; Len() int; Method(int) Method; MethodByName(string) (Method, bool); Name() string; NumField() int; NumIn() int; NumMethod() int; NumOut() int; Out(i int) Type; PkgPath() string; Size() uintptr; String() string; common() *commonType; rawString() string; runtimeType() *runtimeType; uncommon() *uncommonType}"},
+	{pkgpath: "nointerface", name: "I", want: "type I int"},
 }
 
 func TestGoxImporter(t *testing.T) {

src/go/internal/gccgoimporter/parser.go

@@ -541,6 +541,14 @@ func (p *parser) parseNamedType(nlist []int) types.Type {
 		// collect associated methods
 		for p.tok == scanner.Ident {
 			p.expectKeyword("func")
+			if p.tok == '/' {
+				// Skip a /*nointerface*/ comment.
+				p.expect('/')
+				p.expect('*')
+				p.expect(scanner.Ident)
+				p.expect('*')
+				p.expect('/')
+			}
 			p.expect('(')
 			receiver, _ := p.parseParam(pkg)
 			p.expect(')')

src/go/internal/gccgoimporter/testdata/nointerface.go

+// Copyright 2018 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 nointerface
+
+type I int
+
+//go:nointerface
+func (p *I) Get() int { return int(*p) }
+
+func (p *I) Set(v int) { *p = I(v) }

src/go/internal/gccgoimporter/testdata/nointerface.gox

+v3;
+package nointerface
+pkgpath nointerface
+types 3 2 133 17
+type 1 "I" <type -11>
+ func /*nointerface*/ (p <esc:0x1> <type 2>) Get () <type -11>
+ func (p <esc:0x1> <type 2>) Set (v <type -11>)
+type 2 *<type 1>