[runtime] Introduce FastNewStrictArgumentsStub to optimize strict arguments.

src/bootstrapper.cc

 // Copyright 2014 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.
 
 #include "src/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/code-stubs.h"
 #include "src/extensions/externalize-string-extension.h"
@@ skipping 1646 matching lines @@
     // Make sure we can recognize argument objects at runtime.
     // This is done by introducing an anonymous function with
     // class_name equals 'Arguments'.
     Handle<String> arguments_string = factory->Arguments_string();
     Handle<Code> code = isolate->builtins()->Illegal();
     Handle<JSFunction> function = factory->NewFunctionWithoutPrototype(
         arguments_string, code);
     function->shared()->set_instance_class_name(*arguments_string);
 
     Handle<Map> map = factory->NewMap(
-        JS_OBJECT_TYPE, Heap::kSloppyArgumentsObjectSize, FAST_ELEMENTS);
+        JS_OBJECT_TYPE, JSSloppyArgumentsObject::kSize, FAST_ELEMENTS);
     // Create the descriptor array for the arguments object.
     Map::EnsureDescriptorSlack(map, 2);
 
     {  // length
-      DataDescriptor d(factory->length_string(), Heap::kArgumentsLengthIndex,
-                       DONT_ENUM, Representation::Tagged());
+      DataDescriptor d(factory->length_string(),
+                       JSSloppyArgumentsObject::kLengthIndex, DONT_ENUM,
+                       Representation::Tagged());
       map->AppendDescriptor(&d);
     }
     {  // callee
-      DataDescriptor d(factory->callee_string(), Heap::kArgumentsCalleeIndex,
-                       DONT_ENUM, Representation::Tagged());
+      DataDescriptor d(factory->callee_string(),
+                       JSSloppyArgumentsObject::kCalleeIndex, DONT_ENUM,
+                       Representation::Tagged());
       map->AppendDescriptor(&d);
     }
     // @@iterator method is added later.
 
     map->SetInObjectProperties(2);
     native_context()->set_sloppy_arguments_map(*map);
 
     DCHECK(!function->has_initial_map());
     JSFunction::SetInitialMap(function, map,
                               isolate->initial_object_prototype());
 
-    DCHECK(map->GetInObjectProperties() > Heap::kArgumentsCalleeIndex);
-    DCHECK(map->GetInObjectProperties() > Heap::kArgumentsLengthIndex);
     DCHECK(!map->is_dictionary_map());
     DCHECK(IsFastObjectElementsKind(map->elements_kind()));
   }
 
   {  // --- fast and slow aliased arguments map
     Handle<Map> map = isolate->sloppy_arguments_map();
     map = Map::Copy(map, "FastAliasedArguments");
     map->set_elements_kind(FAST_SLOPPY_ARGUMENTS_ELEMENTS);
     DCHECK_EQ(2, map->GetInObjectProperties());
     native_context()->set_fast_aliased_arguments_map(*map);
@@ skipping 15 matching lines @@
     Handle<JSFunction> poison = GetStrictArgumentsPoisonFunction();
 
     // Install the ThrowTypeError functions.
     callee->set_getter(*poison);
     callee->set_setter(*poison);
     caller->set_getter(*poison);
     caller->set_setter(*poison);
 
     // Create the map. Allocate one in-object field for length.
     Handle<Map> map = factory->NewMap(
-        JS_OBJECT_TYPE, Heap::kStrictArgumentsObjectSize, FAST_ELEMENTS);
+        JS_OBJECT_TYPE, JSStrictArgumentsObject::kSize, FAST_ELEMENTS);
     // Create the descriptor array for the arguments object.
     Map::EnsureDescriptorSlack(map, 3);
 
     {  // length
-      DataDescriptor d(factory->length_string(), Heap::kArgumentsLengthIndex,
-                       DONT_ENUM, Representation::Tagged());
+      DataDescriptor d(factory->length_string(),
+                       JSStrictArgumentsObject::kLengthIndex, DONT_ENUM,
+                       Representation::Tagged());
       map->AppendDescriptor(&d);
     }
     {  // callee
       AccessorConstantDescriptor d(factory->callee_string(), callee,
                                    attributes);
       map->AppendDescriptor(&d);
     }
     {  // caller
       AccessorConstantDescriptor d(factory->caller_string(), caller,
                                    attributes);
       map->AppendDescriptor(&d);
     }
     // @@iterator method is added later.
 
     DCHECK_EQ(native_context()->object_function()->prototype(),
               *isolate->initial_object_prototype());
     Map::SetPrototype(map, isolate->initial_object_prototype());
     map->SetInObjectProperties(1);
 
     // Copy constructor from the sloppy arguments boilerplate.
     map->SetConstructor(
         native_context()->sloppy_arguments_map()->GetConstructor());
 
     native_context()->set_strict_arguments_map(*map);
 
-    DCHECK(map->GetInObjectProperties() > Heap::kArgumentsLengthIndex);
     DCHECK(!map->is_dictionary_map());
     DCHECK(IsFastObjectElementsKind(map->elements_kind()));
   }
 
   {  // --- context extension
     // Create a function for the context extension objects.
     Handle<Code> code = isolate->builtins()->Illegal();
     Handle<JSFunction> context_extension_fun = factory->NewFunction(
         factory->empty_string(), code, JS_CONTEXT_EXTENSION_OBJECT_TYPE,
         JSObject::kHeaderSize);
@@ skipping 1881 matching lines @@
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 }  // namespace internal
 }  // namespace v8