Implement Function.apply in the new emitter.

pkg/compiler/lib/src/js_emitter/program_builder.dart

 // Copyright (c) 2014, 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.
 
 library dart2js.js_emitter.program_builder;
 
 import 'js_emitter.dart' show computeMixinClass;
 import 'model.dart';
 
 import '../common.dart';
 import '../js/js.dart' as js;
 
 import '../js_backend/js_backend.dart' show
     Namer,
     JavaScriptBackend,
     JavaScriptConstantCompiler;
 
 import 'js_emitter.dart' show
     ClassStubGenerator,
     CodeEmitterTask,
     InterceptorStubGenerator,
     MainCallStubGenerator,
     ParameterStubGenerator,
     RuntimeTypeGenerator,
     TypeTestProperties;
 
+import '../elements/elements.dart' show ParameterElement;
+
 import '../universe/universe.dart' show Universe;
 import '../deferred_load.dart' show DeferredLoadTask, OutputUnit;
+import '../constants/expressions.dart' show ConstantExpression, ConstantValue;
 
 part 'registry.dart';
 
 class ProgramBuilder {
   final Compiler _compiler;
   final Namer namer;
   final CodeEmitterTask _task;
 
   final Registry _registry;
 
@@ skipping 412 matching lines @@
   // TODO(herhut): Refactor incremental compilation and remove method.
   Method buildMethodHackForIncrementalCompilation(FunctionElement element) {
     assert(_compiler.hasIncrementalSupport);
     if (element.isInstanceMember) {
       return _buildMethod(element);
     } else {
       return _buildStaticMethod(element);
     }
   }
 
+  /* Map | List */ _computeParameterDefaultValues(FunctionSignature signature) {
+    var /* Map | List */ optionalParameterDefaultValues;
+    if (signature.optionalParametersAreNamed) {
+      optionalParameterDefaultValues = new Map<String, ConstantValue>();
+      signature.forEachOptionalParameter((ParameterElement parameter) {
+        ConstantExpression def =
+            backend.constants.getConstantForVariable(parameter);
+        optionalParameterDefaultValues[parameter.name] = def.value;
+      });
+    } else {
+      optionalParameterDefaultValues = <ConstantValue>[];
+      signature.forEachOptionalParameter((ParameterElement parameter) {
+        ConstantExpression def =
+            backend.constants.getConstantForVariable(parameter);
+        optionalParameterDefaultValues.add(def.value);
+      });
+    }
+    return optionalParameterDefaultValues;
+  }
+
   DartMethod _buildMethod(FunctionElement element) {
     String name = namer.getNameOfInstanceMember(element);
     js.Expression code = backend.generatedCode[element];
 
     // TODO(kasperl): Figure out under which conditions code is null.
     if (code == null) return null;
 
     bool canTearOff = false;
     String tearOffName;
     bool isClosure = false;
@@ skipping 40 matching lines @@
     if (element.isGenerativeConstructorBody) {
       // TODO(herhut): Why does this need to be normalized away? We never need
       //               this information anyway as they cannot be torn off or
       //               reflected.
       var body = element;
       memberType = body.constructor.type;
     } else {
       memberType = element.type;
     }
 
+    int requiredParameterCount;
+    var /* List | Map */ optionalParameterDefaultValues;
+    if (canBeApplied || canBeReflected) {
+      FunctionSignature signature = element.functionSignature;
+      requiredParameterCount = signature.requiredParameterCount;
+      optionalParameterDefaultValues =
+          _computeParameterDefaultValues(signature);
+    }
+
     return new InstanceMethod(element, name, code,
         _generateParameterStubs(element, canTearOff), callName, memberType,
         needsTearOff: canTearOff, tearOffName: tearOffName,
         isClosure: isClosure, aliasName: aliasName,
-        canBeApplied: canBeApplied, canBeReflected: canBeReflected);
+        canBeApplied: canBeApplied, canBeReflected: canBeReflected,
+        requiredParameterCount: requiredParameterCount,
+        optionalParameterDefaultValues: optionalParameterDefaultValues);
   }
 
   List<ParameterStubMethod> _generateParameterStubs(FunctionElement element,
                                                     bool canTearOff) {
 
     if (!_methodNeedsStubs(element)) return const <ParameterStubMethod>[];
 
     ParameterStubGenerator generator =
         new ParameterStubGenerator(_compiler, namer, backend);
     return generator.generateParameterStubs(element, canTearOff: canTearOff);
@@ skipping 119 matching lines @@
     String tearOffName =
         needsTearOff ? namer.getStaticClosureName(element) : null;
 
     String callName = null;
     if (needsTearOff) {
       Selector callSelector =
           new Selector.fromElement(element).toCallSelector();
       callName = namer.invocationName(callSelector);
     }
 
+    int requiredParameterCount;
+    var /* List | Map */ optionalParameterDefaultValues;
+    if (canBeApplied || canBeReflected) {
+      FunctionSignature signature = element.functionSignature;
+      requiredParameterCount = signature.requiredParameterCount;
+      optionalParameterDefaultValues =
+          _computeParameterDefaultValues(signature);
+    }
+
     // TODO(floitsch): we shouldn't update the registry in the middle of
     // building a static method.
     return new StaticDartMethod(element,
                                 name, _registry.registerHolder(holder), code,
                                 _generateParameterStubs(element, needsTearOff),
                                 callName, element.type,
                                 needsTearOff: needsTearOff,
                                 tearOffName: tearOffName,
                                 canBeApplied: canBeApplied,
-                                canBeReflected: canBeReflected);
+                                canBeReflected: canBeReflected,
+                                requiredParameterCount: requiredParameterCount,
+                                optionalParameterDefaultValues:
+                                  optionalParameterDefaultValues);
   }
 
   void _registerConstants(OutputUnit outputUnit,
                           Iterable<ConstantValue> constantValues) {
     // `constantValues` is null if an outputUnit doesn't contain any constants.
     if (constantValues == null) return;
     for (ConstantValue constantValue in constantValues) {
       _registry.registerConstant(outputUnit, constantValue);
       assert(!_constants.containsKey(constantValue));
       String name = namer.constantName(constantValue);
       String constantObject = namer.globalObjectForConstant(constantValue);
       Holder holder = _registry.registerHolder(constantObject);
       Constant constant = new Constant(name, holder, constantValue);
       _constants[constantValue] = constant;
     }
   }
 }