Generate tear-off closures dynamically.

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

 // Copyright (c) 2013, 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.js_emitter;
 
 class NsmEmitter extends CodeEmitterHelper {
   final List<Selector> trivialNsmHandlers = <Selector>[];
 
   /// If this is true then we can generate the noSuchMethod handlers at startup
   /// time, instead of them being emitted as part of the Object class.
   bool get generateTrivialNsmHandlers => true;
 
   // If we need fewer than this many noSuchMethod handlers we can save space by
   // just emitting them in JS, rather than emitting the JS needed to generate
   // them at run time.
   static const VERY_FEW_NO_SUCH_METHOD_HANDLERS = 10;
 
   static const MAX_MINIFIED_LENGTH_FOR_DIFF_ENCODING = 4;
 
-  void emitNoSuchMethodHandlers(DefineStubFunction defineStub) {
+  void emitNoSuchMethodHandlers(AddPropertyFunction addProperty) {
     // Do not generate no such method handlers if there is no class.
     if (compiler.codegenWorld.instantiatedClasses.isEmpty) return;
 
     String noSuchMethodName = namer.publicInstanceMethodNameByArity(
         Compiler.NO_SUCH_METHOD, Compiler.NO_SUCH_METHOD_ARG_COUNT);
 
     // Keep track of the JavaScript names we've already added so we
     // do not introduce duplicates (bad for code size).
     Map<String, Selector> addedJsNames = new Map<String, Selector>();
 
@@ skipping 16 matching lines @@
           task.mangledFieldNames[jsName] = reflectionName;
         }
       }
     }
 
     compiler.codegenWorld.invokedNames.forEach(addNoSuchMethodHandlers);
     compiler.codegenWorld.invokedGetters.forEach(addNoSuchMethodHandlers);
     compiler.codegenWorld.invokedSetters.forEach(addNoSuchMethodHandlers);
 
     // Set flag used by generateMethod helper below.  If we have very few
-    // handlers we use defineStub for them all, rather than try to generate them
+    // handlers we use addProperty for them all, rather than try to generate them

[ngeoffray, 2013/12/04 14:38:28]

Line too long.

[Johnni Winther, 2013/12/05 11:49:56]

Long line.

[ahe, 2013/12/06 15:57:54]

Done.

[ahe, 2013/12/06 15:57:54]

Done.

     // at runtime.
     bool haveVeryFewNoSuchMemberHandlers =
         (addedJsNames.length < VERY_FEW_NO_SUCH_METHOD_HANDLERS);
 
     jsAst.Expression generateMethod(String jsName, Selector selector) {
       // Values match JSInvocationMirror in js-helper library.
       int type = selector.invocationMirrorKind;
       List<jsAst.Parameter> parameters = <jsAst.Parameter>[];
       CodeBuffer args = new CodeBuffer();
       for (int i = 0; i < selector.argumentCount; i++) {
@@ skipping 28 matching lines @@
       parameters = backend.isInterceptedName(selector.name)
           ? ([new jsAst.Parameter('\$receiver')]..addAll(parameters))
           : parameters;
       return js.fun(parameters, js.return_(expression));
     }
 
     for (String jsName in addedJsNames.keys.toList()..sort()) {
       Selector selector = addedJsNames[jsName];
       jsAst.Expression method = generateMethod(jsName, selector);
       if (method != null) {
-        defineStub(jsName, method);
+        addProperty(jsName, method);
         String reflectionName = task.getReflectionName(selector, jsName);
         if (reflectionName != null) {
           bool accessible = compiler.world.allFunctions.filter(selector).any(
               (Element e) => backend.isAccessibleByReflection(e));
-          defineStub('+$reflectionName', js(accessible ? '1' : '0'));
+          addProperty('+$reflectionName', js(accessible ? '1' : '0'));
         }
       }
     }
   }
 
   // Identify the noSuchMethod handlers that are so simple that we can
   // generate them programatically.
   bool isTrivialNsmHandler(
       int type, List argNames, Selector selector, String internalName) {
     if (!generateTrivialNsmHandlers) return false;
@@ skipping 233 matching lines @@
                [js.return_(js(
                    'this.$noSuchMethodName('
                        'this, '
                        '$createInvocationMirror('
                            'name, short, type, '
                            '$slice(arguments$sliceOffsetParam), []))'))]))]))
       ])
     ]);
   }
 }