Add metadata for type parameters (TypeVariableMirror).

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 "lib/invocation_mirror.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_entry.h"
 #include "vm/exceptions.h"
 #include "vm/object_store.h"
@@ skipping 417 matching lines @@
 
 
 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()).raw();
 }
 
 
 DEFINE_NATIVE_ENTRY(DeclarationMirror_metadata, 1) {
-  const MirrorReference& decl_ref =
-      MirrorReference::CheckedHandle(arguments->NativeArgAt(0));
-  const Object& decl = Object::Handle(decl_ref.referent());
+  GET_NON_NULL_NATIVE_ARGUMENT(Instance, reflectee, arguments->NativeArgAt(0));
+  Object& decl = Object::Handle();
+  if (reflectee.IsMirrorReference()) {
+    const MirrorReference& decl_ref = MirrorReference::Cast(reflectee);
+    decl = decl_ref.referent();
+  } else if (reflectee.IsTypeParameter()) {
+    decl = reflectee.raw();
+  } else {
+    UNREACHABLE();
+  }
 
   Class& klass = Class::Handle();
   Library& library = Library::Handle();
 
   if (decl.IsClass()) {
     klass ^= decl.raw();
     library = klass.library();
   } else if (decl.IsFunction()) {
     klass = Function::Cast(decl).origin();
     library = klass.library();
   } else if (decl.IsField()) {
     klass = Field::Cast(decl).origin();
     library = klass.library();
   } else if (decl.IsLibrary()) {
     library ^= decl.raw();
+  } else if (decl.IsTypeParameter()) {
+    klass ^= TypeParameter::Cast(decl).parameterized_class();
+    library = klass.library();
   } else {
     return Object::empty_array().raw();
   }
 
   const Object& metadata = Object::Handle(library.GetMetadata(decl));
   if (metadata.IsError()) {
     ThrowInvokeError(Error::Cast(metadata));
   }
   return metadata.raw();
 }
@@ skipping 939 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());
   return field.type();
 }
 
 }  // namespace dart