Optimize the message queue for many active ports with few messages.

runtime/vm/dart_entry.cc

 // 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.
 
 #include "vm/dart_entry.h"
 
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
 #include "vm/object_store.h"
 #include "vm/resolver.h"
@@ skipping 265 matching lines @@
                                kNumArguments,
                                kNumNamedArguments));
   ASSERT(!function.IsNull());
   const Object& result = Object::Handle(
       DartEntry::InvokeDynamic(left, function, arguments, kNoArgumentNames));
   ASSERT(result.IsInstance() || result.IsError());
   return result.raw();
 }
 
 
-RawObject* DartLibraryCalls::HandleMessage(Dart_Port dest_port_id,
+RawObject* DartLibraryCalls::LookupReceivePort(Dart_Port port_id) {
+  Library& isolate_lib = Library::Handle(Library::IsolateLibrary());
+  ASSERT(!isolate_lib.IsNull());
+  const String& public_class_name =
+      String::Handle(Symbols::New("_ReceivePortImpl"));
+  const String& class_name =
+      String::Handle(isolate_lib.PrivateName(public_class_name));
+  const String& function_name =
+      String::Handle(Symbols::New("_lookupReceivePort"));
+  const int kNumArguments = 1;
+  const Array& kNoArgumentNames = Array::Handle();
+  const Function& function = Function::Handle(
+      Resolver::ResolveStatic(isolate_lib,
+                              class_name,
+                              function_name,
+                              kNumArguments,
+                              kNoArgumentNames,
+                              Resolver::kIsQualified));
+  GrowableArray<const Object*> arguments(kNumArguments);
+  arguments.Add(&Integer::Handle(Integer::New(port_id)));
+  const Object& result = Object::Handle(
+      DartEntry::InvokeStatic(function, arguments, kNoArgumentNames));
+  return result.raw();
+}
+
+
+RawObject* DartLibraryCalls::HandleMessage(const Object& receive_port,
                                            Dart_Port reply_port_id,
                                            const Instance& message) {
   Library& isolate_lib = Library::Handle(Library::IsolateLibrary());
   ASSERT(!isolate_lib.IsNull());
   const String& public_class_name =
       String::Handle(Symbols::New("_ReceivePortImpl"));
   const String& class_name =
       String::Handle(isolate_lib.PrivateName(public_class_name));
   const String& function_name =
       String::Handle(Symbols::New("_handleMessage"));
   const int kNumArguments = 3;
   const Array& kNoArgumentNames = Array::Handle();
   const Function& function = Function::Handle(
       Resolver::ResolveStatic(isolate_lib,
                               class_name,
                               function_name,
                               kNumArguments,
                               kNoArgumentNames,
                               Resolver::kIsQualified));
   GrowableArray<const Object*> arguments(kNumArguments);
-  arguments.Add(&Integer::Handle(Integer::New(dest_port_id)));
+  arguments.Add(&receive_port);
   arguments.Add(&Integer::Handle(Integer::New(reply_port_id)));
   arguments.Add(&message);
   const Object& result = Object::Handle(
       DartEntry::InvokeStatic(function, arguments, kNoArgumentNames));
   ASSERT(result.IsNull() || result.IsError());
   return result.raw();
 }
 
 
 RawObject* DartLibraryCalls::NewSendPort(intptr_t port_id) {
@@ skipping 42 matching lines @@
   const String& func_name = String::Handle(Field::GetterName(field_name));
   const Function& func = Function::Handle(cls.LookupDynamicFunction(func_name));
   ASSERT(!func.IsNull());
   GrowableArray<const Object*> arguments;
   const Array& kNoArgumentNames = Array::Handle();
   return DartEntry::InvokeDynamic(port, func, arguments, kNoArgumentNames);
 }
 
 
 }  // namespace dart