Decouple the constant handler from the compiler so we can have more than one.

sdk/lib/_internal/compiler/implementation/compiler.dart

 // 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.
 
 part of dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 171 matching lines @@
   ParserTask parser;
   PatchParserTask patchParser;
   LibraryLoader libraryLoader;
   TreeValidatorTask validator;
   ResolverTask resolver;
   closureMapping.ClosureTask closureToClassMapper;
   TypeCheckerTask checker;
   ti.TypesTask typesTask;
   Backend backend;
   ConstantHandler constantHandler;
+  ConstantHandler metadataHandler;
   EnqueueTask enqueuer;
 
   static const SourceString MAIN = const SourceString('main');
   static const SourceString CALL_OPERATOR_NAME = const SourceString('call');
   static const SourceString NO_SUCH_METHOD = const SourceString('noSuchMethod');
   static const int NO_SUCH_METHOD_ARG_COUNT = 1;
   static const SourceString INVOKE_ON = const SourceString('invokeOn');
   static const SourceString RUNTIME_TYPE = const SourceString('runtimeType');
   static const SourceString START_ROOT_ISOLATE =
       const SourceString('startRootIsolate');
@@ skipping 39 matching lines @@
     resolver = new ResolverTask(this);
     closureToClassMapper = new closureMapping.ClosureTask(this);
     checker = new TypeCheckerTask(this);
     typesTask = new ti.TypesTask(this, enableConcreteTypeInference);
     backend = emitJavaScript ?
         new js_backend.JavaScriptBackend(this,
                                          generateSourceMap,
                                          disallowUnsafeEval) :
         new dart_backend.DartBackend(this, strips);
     constantHandler = new ConstantHandler(this, backend.constantSystem);
+    metadataHandler = new ConstantHandler(this, backend.constantSystem);
     enqueuer = new EnqueueTask(this);
     tasks = [scanner, dietParser, parser, patchParser, libraryLoader,
              resolver, closureToClassMapper, checker, typesTask,
              constantHandler, enqueuer];
     tasks.addAll(backend.tasks);
   }
 
   Universe get resolverWorld => enqueuer.resolution.universe;
   Universe get codegenWorld => enqueuer.codegen.universe;
 
@@ skipping 456 matching lines @@
     withCurrentElement(element,
                        () => resolver.resolveTypedef(element));
   }
 
   FunctionType computeFunctionType(Element element,
                                    FunctionSignature signature) {
     return withCurrentElement(element,
         () => resolver.computeFunctionType(element, signature));
   }
 
-  bool isLazilyInitialized(VariableElement element) {
-    Constant initialValue = compileVariable(element);
-    return initialValue == null;
-  }
-
-  /**
-   * Compiles compile-time constants. Never returns [:null:].
-   * If the initial value is not a compile-time constants reports an error.
-   */
-  Constant compileConstant(VariableElement element) {
-    return withCurrentElement(element, () {
-      return constantHandler.compileConstant(element);
-    });
-  }
-
-  Constant compileVariable(VariableElement element) {
-    return withCurrentElement(element, () {
-      return constantHandler.compileVariable(element);
-    });
-  }
-
   reportWarning(Node node, var message) {
     if (message is TypeWarning) {
       // TODO(ahe): Don't supress these warning when the type checker
       // is more complete.
       if (identical(message.message.kind, MessageKind.NOT_ASSIGNABLE)) return;
       if (identical(message.message.kind, MessageKind.MISSING_RETURN)) return;
       if (identical(message.message.kind, MessageKind.MAYBE_MISSING_RETURN)) return;
       if (identical(message.message.kind, MessageKind.ADDITIONAL_ARGUMENT)) return;
       if (identical(message.message.kind, MessageKind.METHOD_NOT_FOUND)) return;
     }
@@ skipping 186 matching lines @@
   // TODO(johnniwinther): Use [spannable] and [message] to provide better
   // information on assertion errors.
   if (condition is Function){
     condition = condition();
   }
   if (spannable == null || !condition) {
     throw new SpannableAssertionFailure(spannable, message);
   }
   return true;
 }