Reland "Allocation site support for monomorphic StringAdds in BinaryOps".

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 4e49680652fbd5518b983a47447d8be85d1db89c..bb9ff78f47f0d42af112f1c9468ebb92ddca9873 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -42,6 +42,8 @@ namespace internal {
   V(CallFunction)                        \
   V(CallConstruct)                       \
   V(BinaryOpIC)                          \
+  V(BinaryOpICWithAllocationSite)        \
+  V(BinaryOpWithAllocationSite)          \
   V(StringAdd)                           \
   V(NewStringAdd)                        \
   V(SubString)                           \
@@ -1062,7 +1064,7 @@ class KeyedArrayCallStub: public HICStub {
 };
 
 
-class BinaryOpICStub V8_FINAL : public HydrogenCodeStub {
+class BinaryOpICStub : public HydrogenCodeStub {
  public:
   BinaryOpICStub(Token::Value op, OverwriteMode mode)
       : HydrogenCodeStub(UNINITIALIZED), state_(op, mode) {}
@@ -1080,15 +1082,15 @@ class BinaryOpICStub V8_FINAL : public HydrogenCodeStub {
     return Code::BINARY_OP_IC;
   }
 
-  virtual InlineCacheState GetICState() V8_OVERRIDE {
+  virtual InlineCacheState GetICState() V8_FINAL V8_OVERRIDE {
     return state_.GetICState();
   }
 
-  virtual ExtraICState GetExtraICState() V8_OVERRIDE {
+  virtual ExtraICState GetExtraICState() V8_FINAL V8_OVERRIDE {
     return state_.GetExtraICState();
   }
 
-  virtual void VerifyPlatformFeatures(Isolate* isolate) V8_OVERRIDE {
+  virtual void VerifyPlatformFeatures(Isolate* isolate) V8_FINAL V8_OVERRIDE {
     ASSERT(CpuFeatures::VerifyCrossCompiling(SSE2));
   }
 
@@ -1096,7 +1098,12 @@ class BinaryOpICStub V8_FINAL : public HydrogenCodeStub {
 
   const BinaryOpIC::State& state() const { return state_; }
 
-  virtual void PrintState(StringStream* stream) V8_OVERRIDE;
+  virtual void PrintState(StringStream* stream) V8_FINAL V8_OVERRIDE;
+
+  virtual Major MajorKey() V8_OVERRIDE { return BinaryOpIC; }
+  virtual int NotMissMinorKey() V8_FINAL V8_OVERRIDE {
+    return GetExtraICState();
+  }
 
   // Parameters accessed via CodeStubGraphBuilder::GetParameter()
   static const int kLeft = 0;
@@ -1106,15 +1113,89 @@ class BinaryOpICStub V8_FINAL : public HydrogenCodeStub {
   static void GenerateAheadOfTime(Isolate* isolate,
                                   const BinaryOpIC::State& state);
 
-  virtual Major MajorKey() V8_OVERRIDE { return BinaryOpIC; }
-  virtual int NotMissMinorKey() V8_OVERRIDE { return GetExtraICState(); }
-
   BinaryOpIC::State state_;
 
   DISALLOW_COPY_AND_ASSIGN(BinaryOpICStub);
 };
 
 
+// TODO(bmeurer): Merge this into the BinaryOpICStub once we have proper tail
+// call support for stubs in Hydrogen.
+class BinaryOpICWithAllocationSiteStub V8_FINAL : public PlatformCodeStub {
+ public:
+  explicit BinaryOpICWithAllocationSiteStub(const BinaryOpIC::State& state)
+      : state_(state) {}
+
+  static void GenerateAheadOfTime(Isolate* isolate);
+
+  Handle<Code> GetCodeCopyFromTemplate(Isolate* isolate,
+                                       Handle<AllocationSite> allocation_site) {
+    Handle<Code> code = CodeStub::GetCodeCopyFromTemplate(isolate);
+    // Replace the placeholder oddball with the actual allocation site.
+    code->ReplaceNthObject(1, isolate->heap()->oddball_map(), *allocation_site);
+    return code;
+  }
+
+  virtual Code::Kind GetCodeKind() const V8_OVERRIDE {
+    return Code::BINARY_OP_IC;
+  }
+
+  virtual InlineCacheState GetICState() V8_OVERRIDE {
+    return state_.GetICState();
+  }
+
+  virtual ExtraICState GetExtraICState() V8_OVERRIDE {
+    return state_.GetExtraICState();
+  }
+
+  virtual void VerifyPlatformFeatures(Isolate* isolate) V8_OVERRIDE {
+    ASSERT(CpuFeatures::VerifyCrossCompiling(SSE2));
+  }
+
+  virtual void Generate(MacroAssembler* masm) V8_OVERRIDE;
+
+  virtual void PrintState(StringStream* stream) V8_OVERRIDE;
+
+  virtual Major MajorKey() V8_OVERRIDE { return BinaryOpICWithAllocationSite; }
+  virtual int MinorKey() V8_OVERRIDE { return GetExtraICState(); }
+
+ private:
+  static void GenerateAheadOfTime(Isolate* isolate,
+                                  const BinaryOpIC::State& state);
+
+  BinaryOpIC::State state_;
+
+  DISALLOW_COPY_AND_ASSIGN(BinaryOpICWithAllocationSiteStub);
+};
+
+
+class BinaryOpWithAllocationSiteStub V8_FINAL : public BinaryOpICStub {
+ public:
+  explicit BinaryOpWithAllocationSiteStub(const BinaryOpIC::State& state)
+      : BinaryOpICStub(state) {}
+
+  virtual void InitializeInterfaceDescriptor(
+      Isolate* isolate, CodeStubInterfaceDescriptor* descriptor) V8_OVERRIDE;
+
+  static void InstallDescriptors(Isolate* isolate);
+
+  virtual Code::Kind GetCodeKind() const V8_FINAL V8_OVERRIDE {
+    return Code::STUB;
+  }
+
+  virtual Handle<Code> GenerateCode(Isolate* isolate) V8_OVERRIDE;
+
+  virtual Major MajorKey() V8_OVERRIDE {
+    return BinaryOpWithAllocationSite;
+  }
+
+  // Parameters accessed via CodeStubGraphBuilder::GetParameter()
+  static const int kAllocationSite = 0;
+  static const int kLeft = 1;
+  static const int kRight = 2;
+};
+
+
 // TODO(bmeurer): Rename to StringAddStub once we dropped the old StringAddStub.
 class NewStringAddStub V8_FINAL : public HydrogenCodeStub {
  public:
@@ -1130,6 +1211,10 @@ class NewStringAddStub V8_FINAL : public HydrogenCodeStub {
     return PretenureFlagBits::decode(bit_field_);
   }
 
+  virtual void VerifyPlatformFeatures(Isolate* isolate) V8_OVERRIDE {
+    ASSERT(CpuFeatures::VerifyCrossCompiling(SSE2));
+  }
+
   virtual Handle<Code> GenerateCode(Isolate* isolate) V8_OVERRIDE;
 
   virtual void InitializeInterfaceDescriptor(