[turbofan] Optimized support for CreateGeneratorObject.

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 20 matching lines @@
   if (f->intrinsic_type != Runtime::IntrinsicType::INLINE) return NoChange();
   switch (f->function_id) {
     case Runtime::kInlineCreateIterResultObject:
       return ReduceCreateIterResultObject(node);
     case Runtime::kInlineDebugIsActive:
       return ReduceDebugIsActive(node);
     case Runtime::kInlineDeoptimizeNow:
       return ReduceDeoptimizeNow(node);
     case Runtime::kInlineGeneratorClose:
       return ReduceGeneratorClose(node);
+    case Runtime::kInlineCreateJSGeneratorObject:
+      return ReduceCreateJSGeneratorObject(node);
     case Runtime::kInlineGeneratorGetInputOrDebugPos:
       return ReduceGeneratorGetInputOrDebugPos(node);
     case Runtime::kInlineAsyncGeneratorGetAwaitInputOrDebugPos:
       return ReduceAsyncGeneratorGetAwaitInputOrDebugPos(node);
     case Runtime::kInlineAsyncGeneratorReject:
       return ReduceAsyncGeneratorReject(node);
     case Runtime::kInlineAsyncGeneratorResolve:
       return ReduceAsyncGeneratorResolve(node);
     case Runtime::kInlineGeneratorGetResumeMode:
       return ReduceGeneratorGetResumeMode(node);
@@ skipping 101 matching lines @@
       common()->Deoptimize(DeoptimizeKind::kEager, DeoptimizeReason::kNoReason),
       frame_state, effect, control);
   NodeProperties::MergeControlToEnd(graph(), common(), deoptimize);
   Revisit(graph()->end());
 
   node->TrimInputCount(0);
   NodeProperties::ChangeOp(node, common()->Dead());
   return Changed(node);
 }
 
+Reduction JSIntrinsicLowering::ReduceCreateJSGeneratorObject(Node* node) {
+  Node* const closure = NodeProperties::GetValueInput(node, 0);
+  Node* const receiver = NodeProperties::GetValueInput(node, 1);
+  Node* const context = NodeProperties::GetContextInput(node);
+  Node* const effect = NodeProperties::GetEffectInput(node);
+  Node* const control = NodeProperties::GetControlInput(node);
+  Operator const* const op = javascript()->CreateGeneratorObject();
+  Node* create_generator =
+      graph()->NewNode(op, closure, receiver, context, effect, control);
+  ReplaceWithValue(node, create_generator, create_generator);
+  return Changed(create_generator);
+}
+
 Reduction JSIntrinsicLowering::ReduceGeneratorClose(Node* node) {
   Node* const generator = NodeProperties::GetValueInput(node, 0);
   Node* const effect = NodeProperties::GetEffectInput(node);
   Node* const control = NodeProperties::GetControlInput(node);
   Node* const closed = jsgraph()->Constant(JSGeneratorObject::kGeneratorClosed);
   Node* const undefined = jsgraph()->UndefinedConstant();
   Operator const* const op = simplified()->StoreField(
       AccessBuilder::ForJSGeneratorObjectContinuation());
 
   ReplaceWithValue(node, undefined, node);
@@ skipping 334 matching lines @@
   return jsgraph_->javascript();
 }
 
 SimplifiedOperatorBuilder* JSIntrinsicLowering::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8