Sped up hashCode by removing megamorphic call to _identityHashCode.

runtime/vm/object_store.cc

 // 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.
 
 #include "vm/object_store.h"
 
 #include "vm/exceptions.h"
 #include "vm/dart_entry.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 72 matching lines @@
     error_listeners_(GrowableObjectArray::null()),
     empty_context_(Context::null()),
     stack_overflow_(Instance::null()),
     out_of_memory_(Instance::null()),
     preallocated_unhandled_exception_(UnhandledException::null()),
     preallocated_stack_trace_(Stacktrace::null()),
     lookup_port_handler_(Function::null()),
     empty_uint32_array_(TypedData::null()),
     handle_message_function_(Function::null()),
     library_load_error_table_(Array::null()),
+    simple_instance_of_function_(Function::null()),
+    simple_instance_of_true_function_(Function::null()),
+    simple_instance_of_false_function_(Function::null()),
+    compile_time_constants_(Array::null()),
     unique_dynamic_targets_(Array::null()),
     token_objects_(GrowableObjectArray::null()),
     token_objects_map_(Array::null()),
     megamorphic_cache_table_(GrowableObjectArray::null()),
     megamorphic_miss_code_(Code::null()),
     megamorphic_miss_function_(Function::null()) {
   for (RawObject** current = from(); current <= to(); current++) {
     ASSERT(*current == Object::null());
   }
 }
@@ skipping 91 matching lines @@
       Stacktrace::New(code_array, pc_offset_array));
   // Expansion of inlined functions requires additional memory at run time,
   // avoid it.
   stack_trace.set_expand_inlined(false);
   set_preallocated_stack_trace(stack_trace);
 
   return Error::null();
 }
 
 
+RawFunction* ObjectStore::PrivateObjectLookup(const String& name) {
+  const Library& core_lib = Library::Handle(core_library());
+  const String& mangled = String::ZoneHandle(core_lib.PrivateName(name));
+  const Class& cls = Class::Handle(object_class());
+  const Function& result = Function::Handle(cls.LookupDynamicFunction(mangled));
+  ASSERT(!result.IsNull());
+  return result.raw();
+}
+
+
 void ObjectStore::InitKnownObjects() {
 #ifdef DART_PRECOMPILED_RUNTIME
   // These objects are only needed for code generation.
   return;
 #else
   Thread* thread = Thread::Current();
   Zone* zone = thread->zone();
   Isolate* isolate = thread->isolate();
   ASSERT(isolate != NULL && isolate->object_store() == this);
 
   const Library& async_lib = Library::Handle(async_library());
   ASSERT(!async_lib.IsNull());
   Class& cls = Class::Handle(zone);
   cls = async_lib.LookupClass(Symbols::Future());
   ASSERT(!cls.IsNull());
   set_future_class(cls);
   cls = async_lib.LookupClass(Symbols::Completer());
   ASSERT(!cls.IsNull());
   set_completer_class(cls);
   cls = async_lib.LookupClass(Symbols::StreamIterator());
   ASSERT(!cls.IsNull());
   set_stream_iterator_class(cls);
 
   const Library& internal_lib = Library::Handle(internal_library());
   cls = internal_lib.LookupClass(Symbols::Symbol());
   set_symbol_class(cls);
+
+  // Cache the core private functions used for fast instance of checks.
+  simple_instance_of_function_ =
+      PrivateObjectLookup(Symbols::_simpleInstanceOf());
+  simple_instance_of_true_function_ =
+      PrivateObjectLookup(Symbols::_simpleInstanceOfTrue());
+  simple_instance_of_false_function_ =
+      PrivateObjectLookup(Symbols::_simpleInstanceOfFalse());
 #endif
 }
 
 }  // namespace dart