[es6] Introduce spec compliant IsConstructor.

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 174 matching lines @@
 bool Object::IsUniqueName() const {
   return IsInternalizedString() || IsSymbol();
 }
 
 
 bool Object::IsCallable() const {
   return Object::IsHeapObject() && HeapObject::cast(this)->map()->is_callable();
 }
 
 
+bool Object::IsConstructor() const {
+  return Object::IsHeapObject() &&
+         HeapObject::cast(this)->map()->is_constructor();
+}
+
+
 bool Object::IsSpecObject() const {
   return Object::IsHeapObject()
     && HeapObject::cast(this)->map()->instance_type() >= FIRST_SPEC_OBJECT_TYPE;
 }
 
 
 bool Object::IsTemplateInfo() const {
   return IsObjectTemplateInfo() || IsFunctionTemplateInfo();
 }
 
@@ skipping 4320 matching lines @@
     set_bit_field(bit_field() & ~(1 << kHasNonInstancePrototype));
   }
 }
 
 
 bool Map::has_non_instance_prototype() {
   return ((1 << kHasNonInstancePrototype) & bit_field()) != 0;
 }
 
 
-void Map::set_function_with_prototype(bool value) {
-  set_bit_field(FunctionWithPrototype::update(bit_field(), value));
+void Map::set_is_constructor(bool value) {
+  if (value) {
+    set_bit_field(bit_field() | (1 << kIsConstructor));
+  } else {
+    set_bit_field(bit_field() & ~(1 << kIsConstructor));
+  }
 }
 
 
-bool Map::function_with_prototype() {
-  return FunctionWithPrototype::decode(bit_field());
+bool Map::is_constructor() const {
+  return ((1 << kIsConstructor) & bit_field()) != 0;
 }
 
 
 void Map::set_is_hidden_prototype() {
   set_bit_field3(IsHiddenPrototype::update(bit_field3(), true));
 }
 
 
 bool Map::is_hidden_prototype() const {
   return IsHiddenPrototype::decode(bit_field3());
@@ skipping 236 matching lines @@
 
 bool Map::IsPrimitiveMap() {
   STATIC_ASSERT(FIRST_PRIMITIVE_TYPE == FIRST_TYPE);
   return instance_type() <= LAST_PRIMITIVE_TYPE;
 }
 bool Map::IsJSObjectMap() {
   STATIC_ASSERT(LAST_JS_OBJECT_TYPE == LAST_TYPE);
   return instance_type() >= FIRST_JS_OBJECT_TYPE;
 }
 bool Map::IsJSArrayMap() { return instance_type() == JS_ARRAY_TYPE; }
+bool Map::IsJSFunctionMap() { return instance_type() == JS_FUNCTION_TYPE; }
 bool Map::IsStringMap() { return instance_type() < FIRST_NONSTRING_TYPE; }
 bool Map::IsJSProxyMap() {
   InstanceType type = instance_type();
   return FIRST_JS_PROXY_TYPE <= type && type <= LAST_JS_PROXY_TYPE;
 }
 bool Map::IsJSGlobalProxyMap() {
   return instance_type() == JS_GLOBAL_PROXY_TYPE;
 }
 bool Map::IsJSGlobalObjectMap() {
   return instance_type() == JS_GLOBAL_OBJECT_TYPE;
@@ skipping 1441 matching lines @@
   if (map()->has_non_instance_prototype()) {
     Object* prototype = map()->GetConstructor();
     // The map must have a prototype in that field, not a back pointer.
     DCHECK(!prototype->IsMap());
     return prototype;
   }
   return instance_prototype();
 }
 
 
-bool JSFunction::should_have_prototype() {
-  return map()->function_with_prototype();
-}
-
-
 bool JSFunction::is_compiled() {
   Builtins* builtins = GetIsolate()->builtins();
   return code() != builtins->builtin(Builtins::kCompileLazy) &&
          code() != builtins->builtin(Builtins::kCompileOptimized) &&
          code() != builtins->builtin(Builtins::kCompileOptimizedConcurrent);
 }
 
 
 bool JSFunction::has_simple_parameters() {
   return shared()->has_simple_parameters();
@@ skipping 1733 matching lines @@
 #undef READ_INT64_FIELD
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_