Don't generate forwarding hooks if all noSuchMethod implementations

tests/compiler/dart2js/no_such_method_enabled_test.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:expect/expect.dart';
+import "package:async_helper/async_helper.dart";
+import 'compiler_helper.dart';
+
+dummyImplTest() {
+  String source = """
+class A {
+  foo() => 3;
+  noSuchMethod(x) => super.noSuchMethod(x);
+}
+main() {
+  print(new A().foo());
+}
+""";
+  Uri uri = new Uri(scheme: 'source');
+  var compiler = compilerFor(source, uri);
+  asyncTest(() => compiler.runCompiler(uri).then((_) {
+    Expect.isFalse(compiler.backend.enabledNoSuchMethod);
+    ClassElement clsA = findElement(compiler, 'A');
+    Expect.isTrue(
+        compiler.backend.noSuchMethodRegistry.defaultImpls.contains(
+            clsA.lookupMember('noSuchMethod')));
+  }));
+}
+
+dummyImplTest2() {
+  String source = """
+class A extends B {
+  foo() => 3;
+  noSuchMethod(x) => super.noSuchMethod(x);
+}
+class B {}
+main() {
+  print(new A().foo());
+}
+""";
+  Uri uri = new Uri(scheme: 'source');
+  var compiler = compilerFor(source, uri);
+  asyncTest(() => compiler.runCompiler(uri).then((_) {
+    Expect.isFalse(compiler.backend.enabledNoSuchMethod);
+    ClassElement clsA = findElement(compiler, 'A');
+    Expect.isTrue(
+        compiler.backend.noSuchMethodRegistry.defaultImpls.contains(
+            clsA.lookupMember('noSuchMethod')));
+  }));
+}
+
+dummyImplTest3() {
+  String source = """
+class A extends B {
+  foo() => 3;
+  noSuchMethod(x) {
+    return super.noSuchMethod(x);
+  }
+}
+class B {}
+main() {
+  print(new A().foo());
+}
+""";
+  Uri uri = new Uri(scheme: 'source');
+  var compiler = compilerFor(source, uri);
+  asyncTest(() => compiler.runCompiler(uri).then((_) {
+    Expect.isFalse(compiler.backend.enabledNoSuchMethod);
+    ClassElement clsA = findElement(compiler, 'A');
+    Expect.isTrue(
+        compiler.backend.noSuchMethodRegistry.defaultImpls.contains(
+            clsA.lookupMember('noSuchMethod')));
+  }));
+}
+
+dummyImplTest4() {
+  String source = """
+class A extends B {
+  foo() => 3;
+  noSuchMethod(x) => super.noSuchMethod(x);
+}
+class B {
+  noSuchMethod(x) => super.noSuchMethod(x);
+}
+main() {
+  print(new A().foo());
+}
+""";
+  Uri uri = new Uri(scheme: 'source');
+  var compiler = compilerFor(source, uri);
+  asyncTest(() => compiler.runCompiler(uri).then((_) {
+    Expect.isFalse(compiler.backend.enabledNoSuchMethod);
+    ClassElement clsA = findElement(compiler, 'A');
+    Expect.isTrue(
+        compiler.backend.noSuchMethodRegistry.defaultImpls.contains(
+            clsA.lookupMember('noSuchMethod')));
+    ClassElement clsB = findElement(compiler, 'B');
+    Expect.isTrue(
+        compiler.backend.noSuchMethodRegistry.defaultImpls.contains(
+            clsB.lookupMember('noSuchMethod')));
+  }));
+}
+
+dummyImplTest5() {
+  String source = """
+class A extends B {
+  foo() => 3;
+  noSuchMethod(x) => super.noSuchMethod(x);
+}
+class B {
+  noSuchMethod(x) => throw 'foo';
+}
+main() {
+  print(new A().foo());
+}
+""";
+  Uri uri = new Uri(scheme: 'source');
+  var compiler = compilerFor(source, uri);
+  asyncTest(() => compiler.runCompiler(uri).then((_) {
+    Expect.isTrue(compiler.backend.enabledNoSuchMethod);
+    ClassElement clsA = findElement(compiler, 'A');
+    Expect.isTrue(
+        compiler.backend.noSuchMethodRegistry.throwingImpls.contains(
+            clsA.lookupMember('noSuchMethod')));
+    ClassElement clsB = findElement(compiler, 'B');
+    Expect.isTrue(
+        compiler.backend.noSuchMethodRegistry.throwingImpls.contains(
+            clsB.lookupMember('noSuchMethod')));
+  }));
+}
+
+dummyImplTest6() {
+  String source = """
+class A {
+  noSuchMethod(x) => 3;
+}
+main() {
+  print(new A().foo());
+}
+""";
+  Uri uri = new Uri(scheme: 'source');
+  var compiler = compilerFor(source, uri);
+  asyncTest(() => compiler.runCompiler(uri).then((_) {
+    Expect.isTrue(compiler.backend.enabledNoSuchMethod);
+    ClassElement clsA = findElement(compiler, 'A');
+    Expect.isTrue(
+        compiler.backend.noSuchMethodRegistry.otherImpls.contains(
+            clsA.lookupMember('noSuchMethod')));
+  }));
+}
+
+main() {
+  dummyImplTest();
+  dummyImplTest2();
+  dummyImplTest3();
+  dummyImplTest4();
+  dummyImplTest5();
+  dummyImplTest6();
+}