Add initial hydrogenized NewStringAddStub.

src/code-stubs.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 25 matching lines @@
 
 namespace v8 {
 namespace internal {
 
 // List of code stubs used on all platforms.
 #define CODE_STUB_LIST_ALL_PLATFORMS(V)  \
   V(CallFunction)                        \
   V(CallConstruct)                       \
   V(BinaryOp)                            \
   V(StringAdd)                           \
+  V(NewStringAdd)                        \
   V(SubString)                           \
   V(StringCompare)                       \
   V(Compare)                             \
   V(CompareIC)                           \
   V(CompareNilIC)                        \
   V(MathPow)                             \
   V(StringLength)                        \
   V(FunctionPrototype)                   \
   V(StoreArrayLength)                    \
   V(RecordWrite)                         \
@@ skipping 1116 matching lines @@
   Token::Value op_;
   OverwriteMode mode_;
 
   Maybe<int> fixed_right_arg_;
   State left_state_;
   State right_state_;
   State result_state_;
 };
 
 
+// TODO(bmeurer): Rename to StringAddStub once we dropped the old StringAddStub.
+class NewStringAddStub V8_FINAL : public HydrogenCodeStub {
+ public:
+  NewStringAddStub(StringAddFlags flags, PretenureFlag pretenure_flag)
+      : bit_field_(StringAddFlagsBits::encode(flags) |
+                   PretenureFlagBits::encode(pretenure_flag)) {}
+
+  StringAddFlags flags() const {
+    return StringAddFlagsBits::decode(bit_field_);
+  }
+
+  PretenureFlag pretenure_flag() const {
+    return PretenureFlagBits::decode(bit_field_);
+  }
+
+  virtual Handle<Code> GenerateCode(Isolate* isolate) V8_OVERRIDE;
+
+  virtual void InitializeInterfaceDescriptor(
+      Isolate* isolate,
+      CodeStubInterfaceDescriptor* descriptor) V8_OVERRIDE;
+
+  static void InstallDescriptors(Isolate* isolate);
+
+  // Parameters accessed via CodeStubGraphBuilder::GetParameter()
+  static const int kLeft = 0;
+  static const int kRight = 1;
+
+ private:
+  class StringAddFlagsBits: public BitField<StringAddFlags, 0, 2> {};
+  class PretenureFlagBits: public BitField<PretenureFlag, 2, 1> {};
+  uint32_t bit_field_;
+
+  virtual Major MajorKey() V8_OVERRIDE { return NewStringAdd; }
+  virtual int NotMissMinorKey() V8_OVERRIDE { return bit_field_; }
+
+  virtual void PrintBaseName(StringStream* stream) V8_OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(NewStringAddStub);
+};
+
+
 class ICCompareStub: public PlatformCodeStub {
  public:
   ICCompareStub(Token::Value op,
                 CompareIC::State left,
                 CompareIC::State right,
                 CompareIC::State handler)
       : op_(op),
         left_(left),
         right_(right),
         state_(handler) {
@@ skipping 1172 matching lines @@
   int MinorKey() { return 0; }
 
   void Generate(MacroAssembler* masm);
 
   DISALLOW_COPY_AND_ASSIGN(ProfileEntryHookStub);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_