Fix ParameterMirror.hasDefaultValue/defaultValue in source mirrors.

tests/compiler/dart2js/mirrors/default_value_test.dart

+// Copyright (c) 2013, 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 "dart:mirrors";
+
+import "package:async_helper/async_helper.dart";
+import "package:expect/expect.dart";
+import "../memory_compiler.dart";
+
+const SOURCE = const {
+  'main.dart': """
+library main;
+
+class Class {
+  var a, b, c, d, e, f, g, h;
+  Class.optional(this.a, int b, void this.c(), 
+                 [this.d, int this.e, void this.f(), 
+                  this.g = 0, int this.h = 0]);
+  Class.named(this.a, int b, void this.c(), 
+                 {this.d, int this.e, void this.f(), 
+                  this.g: 0, int this.h: 0});
+  methodOptional(a, int b, void c(), 
+                 [d, int e, void f(), 
+                  g = 0, int h = 0]) {}
+  methodNamed(a, int b, void c(), 
+              {d, int e, void f(), 
+               g: 0, int h: 0}) {}
+} 
+""",
+};
+
+main() {
+  asyncTest(() => mirrorSystemFor(SOURCE).then((MirrorSystem mirrors) {
+    LibraryMirror dartCore = mirrors.libraries[Uri.parse('memory:main.dart')];
+    ClassMirror classMirror = dartCore.declarations[#Class];
+    testMethod(classMirror.declarations[#optional]);
+    testMethod(classMirror.declarations[#named]);
+    testMethod(classMirror.declarations[#methodOptional]);
+    testMethod(classMirror.declarations[#methodNamed]);
+  }));
+}
+
+testMethod(MethodMirror mirror) {
+  Expect.equals(8, mirror.parameters.length);
+  for (int i = 0 ; i < 6 ; i++) {
+    testParameter(mirror.parameters[i], false);
+  }
+  for (int i = 6 ; i < 8 ; i++) {
+    testParameter(mirror.parameters[i], true);
+  }
+}
+
+testParameter(ParameterMirror mirror, bool expectDefaultValue) {
+  if (expectDefaultValue) {
+    Expect.isTrue(mirror.hasDefaultValue);
+    Expect.isNotNull(mirror.defaultValue);
+  } else {
+    Expect.isFalse(mirror.hasDefaultValue);
+    Expect.isNull(mirror.defaultValue);
+  }
+}