Adding %_NewObject intrinsic

src/compiler/js-intrinsic-lowering.cc

 // Copyright 2015 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/compiler/js-intrinsic-lowering.h"
 
 #include <stack>
 
 #include "src/code-factory.h"
 #include "src/compiler/access-builder.h"
@@ skipping 71 matching lines @@
     case Runtime::kInlineToNumber:
       return ReduceToNumber(node);
     case Runtime::kInlineToObject:
       return ReduceToObject(node);
     case Runtime::kInlineToPrimitive:
       return ReduceToPrimitive(node);
     case Runtime::kInlineToString:
       return ReduceToString(node);
     case Runtime::kInlineCall:
       return ReduceCall(node);
+    case Runtime::kInlineNewObject:
+      return ReduceNewObject(node);
     case Runtime::kInlineGetSuperConstructor:
       return ReduceGetSuperConstructor(node);
     case Runtime::kInlineGetOrdinaryHasInstance:
       return ReduceGetOrdinaryHasInstance(node);
     default:
       break;
   }
   return NoChange();
 }
 
@@ skipping 368 matching lines @@
 
 Reduction JSIntrinsicLowering::ReduceCall(Node* node) {
   size_t const arity = CallRuntimeParametersOf(node->op()).arity();
   NodeProperties::ChangeOp(node,
                            javascript()->CallFunction(arity, VectorSlotPair(),
                                                       ConvertReceiverMode::kAny,
                                                       TailCallMode::kDisallow));
   return Changed(node);
 }
 
+Reduction JSIntrinsicLowering::ReduceNewObject(Node* node) {
+  return Change(node, CodeFactory::FastNewObject(isolate()), 0);

[Benedikt Meurer, 2016/03/31 17:49:29]

%_NewObject should be lowered to JSCreate, which does the fast case if possible
and otherwise falls back to FastNewObjectStub.

+}
 
 Reduction JSIntrinsicLowering::ReduceGetSuperConstructor(Node* node) {
   Node* active_function = NodeProperties::GetValueInput(node, 0);
   Node* effect = NodeProperties::GetEffectInput(node);
   Node* control = NodeProperties::GetControlInput(node);
   Node* active_function_map = effect =
       graph()->NewNode(simplified()->LoadField(AccessBuilder::ForMap()),
                        active_function, effect, control);
   return Change(node, simplified()->LoadField(AccessBuilder::ForMapPrototype()),
                 active_function_map, effect, control);
@@ skipping 84 matching lines @@
 }
 
 
 SimplifiedOperatorBuilder* JSIntrinsicLowering::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8