Introduce typed selectors to do better tree shaking based on calls on 'this'. Getters and setters w…

lib/compiler/implementation/ssa/optimize.dart

 // Copyright (c) 2011, 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.
 
 interface OptimizationPhase {
   String get name();
   void visitGraph(HGraph graph);
 }
 
 class SsaOptimizerTask extends CompilerTask {
@@ skipping 160 matching lines @@
     return node;
   }
 
   HInstruction visitInvokeDynamic(HInvokeDynamic node) {
     HType receiverType = node.receiver.propagatedType;
     if (receiverType.isNonPrimitive()) {
       HNonPrimitiveType type = receiverType;
       Element element = type.lookupMember(node.name);
       // TODO(ngeoffray): Also fold if it's a getter or variable.
       if (element != null && element.isFunction()) {
-        FunctionElement method = element;
-        FunctionParameters parameters = method.computeParameters(compiler);
-        if (node.selector.applies(parameters)) {
+        if (node.selector.applies(element, compiler)) {
+          FunctionElement method = element;
+          FunctionParameters parameters = method.computeParameters(compiler);
           if (parameters.optionalParameterCount == 0) {
             node.element = element;
           }
           // TODO(ngeoffray): If the method has optional parameters,
           // we should pass the default values here.
         }
       }
     }
     return node;
   }
@@ skipping 622 matching lines @@
         }
       }
       if (!canBeMoved) continue;
 
       // This is safe because we are running after GVN.
       // TODO(ngeoffray): ensure GVN has been run.
       set_.add(current);
     }
   }
 }