[turbofan] Introduce JSCreateLowering for optimizing JSCreate nodes.

src/compiler/js-create-lowering.h

Index: src/compiler/js-create-lowering.h
diff --git a/src/compiler/js-create-lowering.h b/src/compiler/js-create-lowering.h
new file mode 100644
index 0000000000000000000000000000000000000000..743c060b883078319e98798415f04e514b5fc4e0
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+++ b/src/compiler/js-create-lowering.h
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+// Copyright 2016 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.
+
+#ifndef V8_COMPILER_JS_CREATE_LOWERING_H_
+#define V8_COMPILER_JS_CREATE_LOWERING_H_
+
+#include "src/compiler/graph-reducer.h"
+
+namespace v8 {
+namespace internal {
+
+// Forward declarations.
+class CompilationDependencies;
+class Factory;
+
+
+namespace compiler {
+
+// Forward declarations.
+class CommonOperatorBuilder;
+class JSGraph;
+class JSOperatorBuilder;
+class MachineOperatorBuilder;
+class SimplifiedOperatorBuilder;
+
+
+// Lowers JSCreate-level operators to fast (inline) allocations.
+class JSCreateLowering final : public AdvancedReducer {
+ public:
+  JSCreateLowering(Editor* editor, CompilationDependencies* dependencies,
+                   JSGraph* jsgraph)
+      : AdvancedReducer(editor),
+        dependencies_(dependencies),
+        jsgraph_(jsgraph) {}
+  ~JSCreateLowering() final {}
+
+  Reduction Reduce(Node* node) final;
+
+ private:
+  Reduction ReduceJSCreate(Node* node);
+  Reduction ReduceJSCreateArguments(Node* node);
+  Reduction ReduceJSCreateArray(Node* node);
+  Reduction ReduceJSCreateIterResultObject(Node* node);
+  Reduction ReduceJSCreateFunctionContext(Node* node);
+  Reduction ReduceJSCreateWithContext(Node* node);
+  Reduction ReduceJSCreateCatchContext(Node* node);
+  Reduction ReduceJSCreateBlockContext(Node* node);
+  Reduction ReduceNewArray(Node* node, Node* length, int capacity,
+                           Handle<AllocationSite> site);
+
+  Node* AllocateArguments(Node* effect, Node* control, Node* frame_state);
+  Node* AllocateRestArguments(Node* effect, Node* control, Node* frame_state,
+                              int start_index);
+  Node* AllocateAliasedArguments(Node* effect, Node* control, Node* frame_state,
+                                 Node* context, Handle<SharedFunctionInfo>,
+                                 bool* has_aliased_arguments);
+  Node* AllocateElements(Node* effect, Node* control,
+                         ElementsKind elements_kind, int capacity,
+                         PretenureFlag pretenure);
+
+  Factory* factory() const;
+  Graph* graph() const;
+  JSGraph* jsgraph() const { return jsgraph_; }
+  Isolate* isolate() const;
+  JSOperatorBuilder* javascript() const;
+  CommonOperatorBuilder* common() const;
+  SimplifiedOperatorBuilder* simplified() const;
+  MachineOperatorBuilder* machine() const;
+  CompilationDependencies* dependencies() const { return dependencies_; }
+
+  CompilationDependencies* const dependencies_;
+  JSGraph* const jsgraph_;
+};
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_COMPILER_JS_CREATE_LOWERING_H_