Make ClassMirror.typeVariables lazy and convert dependencies to native code.

runtime/lib/mirrors_impl.dart

Index: runtime/lib/mirrors_impl.dart
diff --git a/runtime/lib/mirrors_impl.dart b/runtime/lib/mirrors_impl.dart
index acd568d6e6d65f4c8eacdbf0b1cba6e4cf605f02..8919165c4dffe7cd7a6ddf820c31497f010d0921 100644
--- a/runtime/lib/mirrors_impl.dart
+++ b/runtime/lib/mirrors_impl.dart
@@ -4,6 +4,8 @@
 
 // VM-specific implementation of the dart:mirrors library.
 
+import "dart:collection";
+
 // These values are allowed to be passed directly over the wire.
 bool _isSimpleValue(var value) {
   return (value == null || value is num || value is String || value is bool);
@@ -401,11 +403,9 @@ class _LocalClassMirrorImpl extends _LocalObjectMirrorImpl
                         this._superclass,
                         this._superinterfaces,
                         this._defaultFactory,
-                        Map<String, Mirror> constructors,
-                        Map<String, Mirror> typeVariables)
+                        Map<String, Mirror> constructors)
       : this._simpleName = _s(simpleName),
         this.constructors = _convertStringToSymbolMap(constructors),
-        this.typeVariables = _convertStringToSymbolMap(typeVariables),
         super(reflectee);
 
   Symbol _simpleName;
@@ -528,7 +528,17 @@ class _LocalClassMirrorImpl extends _LocalObjectMirrorImpl
   }
 
   Map<Symbol, MethodMirror> constructors;
-  Map<Symbol, TypeVariableMirror> typeVariables;
+
+  Map<Symbol, TypeVariableMirror> _typeVariables = null;
+  Map<Symbol, TypeVariableMirror> get typeVariables {

[Michael Lippautz (Google), 2013/07/25 20:17:57]

Future API may return a List here. We already get a list from native code, but
convert it to a Map (not changing behavior) for now.

+    if (_typeVariables == null) {
+      List<TypeVariableMirror> result = _ClassMirror_type_variables(
+          _reflectee, this);
+      _typeVariables = new LinkedHashMap<Symbol, TypeVariableMirror>
+          .fromIterable(result, key: (e) => e.simpleName);
+    }
+    return _typeVariables;
+  }
 
   Map<Symbol, TypeMirror> get typeArguments {
     throw new UnimplementedError(
@@ -606,6 +616,9 @@ class _LocalClassMirrorImpl extends _LocalObjectMirrorImpl
 
   static _invokeConstructor(reflectee, constructorName, positionalArguments)
       native 'ClassMirror_invokeConstructor';
+
+  static _ClassMirror_type_variables(reflectee, mirror)
+      native "ClassMirror_type_variables";
 }
 
 class _LazyFunctionTypeMirror {
@@ -633,7 +646,6 @@ class _LocalFunctionTypeMirrorImpl extends _LocalClassMirrorImpl
               new _LazyTypeMirror('dart:core', 'Object'),
               [ new _LazyTypeMirror('dart:core', 'Function') ],
               null,
-              const {},
               const {});
 
   Map<Symbol, Mirror> get members => const {};
@@ -647,6 +659,7 @@ class _LocalFunctionTypeMirrorImpl extends _LocalClassMirrorImpl
   }
 
   final List<ParameterMirror> parameters;
+  final Map<Symbol, TypeVariableMirror> typeVariables = const {};
 
   String toString() => "FunctionTypeMirror on '${_n(simpleName)}'";
 }
@@ -680,8 +693,7 @@ class _LocalTypeVariableMirrorImpl extends _LocalDeclarationMirrorImpl
     implements TypeVariableMirror {
   _LocalTypeVariableMirrorImpl(reflectee,
                                String simpleName,
-                               this._owner,
-                               this._upperBound)
+                               this._owner)
       : this.simpleName = _s(simpleName),
         super(reflectee);
 
@@ -697,6 +709,10 @@ class _LocalTypeVariableMirrorImpl extends _LocalDeclarationMirrorImpl
 
   var _owner;
   DeclarationMirror get owner {
+    if (_owner == null) {
+      _owner = _LocalTypeVariableMirror_owner(_reflectee);
+    }
+    // TODO(11897): This will go away, as soon as lazy mirrors go away.
     if (_owner is! Mirror) {
       _owner = _owner.resolve(mirrors);
     }
@@ -712,10 +728,10 @@ class _LocalTypeVariableMirrorImpl extends _LocalDeclarationMirrorImpl
         'TypeVariableMirror.location is not implemented');
   }
 
-  var _upperBound;
+  TypeMirror _upperBound = null;
   TypeMirror get upperBound {
-    if (_upperBound is! Mirror) {
-      _upperBound = _upperBound.resolve(mirrors);
+    if (_upperBound == null) {
+      _upperBound = _LocalTypeVariableMirror_upper_bound(_reflectee);
     }
     return _upperBound;
   }
@@ -726,6 +742,12 @@ class _LocalTypeVariableMirrorImpl extends _LocalDeclarationMirrorImpl
   }
 
   String toString() => "TypeVariableMirror on '${_n(simpleName)}'";
+
+  static DeclarationMirror _LocalTypeVariableMirror_owner(reflectee)
+      native "LocalTypeVariableMirror_owner";
+
+  static TypeMirror _LocalTypeVariableMirror_upper_bound(reflectee)
+      native "LocalTypeVariableMirror_upper_bound";
 }