Implement mirror equality on the VM. Resolves issue 12026.

runtime/lib/mirrors.cc

 // Copyright (c) 2012, 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.
 
 #include "include/dart_api.h"
 #include "include/dart_debugger_api.h"
 #include "include/dart_mirrors_api.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"  // TODO(11742): Remove with CreateMirrorRef.
 #include "vm/bootstrap_natives.h"
@@ skipping 436 matching lines @@
     const LanguageError& compilation_error = LanguageError::Cast(error);
     String& message = String::Handle(compilation_error.message());
     ThrowMirroredCompilationError(message);
     UNREACHABLE();
   }
   Exceptions::PropagateError(error);
   UNREACHABLE();
 }
 
 
+DEFINE_NATIVE_ENTRY(MirrorReference_equals, 2) {
+  GET_NON_NULL_NATIVE_ARGUMENT(MirrorReference, a, arguments->NativeArgAt(0));
+  GET_NON_NULL_NATIVE_ARGUMENT(MirrorReference, b, arguments->NativeArgAt(1));
+  return Bool::Get(a.referent() == b.referent());

[rmacnak, 2013/07/31 18:38:01]

Assert no GC? Identical_comparison doesn't.

[siva, 2013/08/01 00:05:06]

Sure you can add a NoGCScope here if you want.

On 2013/07/31 18:38:01, Ryan Macnak wrote:

+}
+
+
 DEFINE_NATIVE_ENTRY(DeclarationMirror_metadata, 1) {
   const MirrorReference& decl_ref =
       MirrorReference::CheckedHandle(arguments->NativeArgAt(0));
   const Object& decl = Object::Handle(decl_ref.referent());
 
   Class& klass = Class::Handle();
   if (decl.IsClass()) {
     klass ^= decl.raw();
   } else if (decl.IsFunction()) {
     klass = Function::Cast(decl).origin();
@@ skipping 847 matching lines @@
 
 DEFINE_NATIVE_ENTRY(VariableMirror_type, 1) {
   GET_NON_NULL_NATIVE_ARGUMENT(MirrorReference, ref, arguments->NativeArgAt(0));
   const Field& field = Field::Handle(ref.GetFieldReferent());
 
   const AbstractType& type = AbstractType::Handle(field.type());
   return CreateTypeMirror(type);
 }
 
 }  // namespace dart