Compile FastCloneShallowObjectStub using Crankshaft.

src/hydrogen.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 894 matching lines @@
       HValue* val,
       HCheckMaps* mapcheck,
       bool is_js_array,
       ElementsKind elements_kind,
       bool is_store,
       Representation checked_index_representation = Representation::None());
 
   HInstruction* BuildStoreMap(HValue* object, HValue* map, BailoutId id);
   HInstruction* BuildStoreMap(HValue* object, Handle<Map> map, BailoutId id);
 
+  class CheckBuilder {
+   public:
+    CheckBuilder(HGraphBuilder* builder,
+                 BailoutId id = BailoutId::StubEntry());
+    ~CheckBuilder() {
+      if (!finished_) End();
+    }
+
+    void CheckNotUndefined(HValue* value);
+    void CheckIntegerEq(HValue* left, HValue* right);
+    void End();
+
+   private:
+    HGraphBuilder* builder_;
+    bool finished_;
+    HBasicBlock* failure_block_;
+    HBasicBlock* merge_block_;
+    BailoutId id_;
+
+    Zone* zone() { return builder_->zone(); }

[Jakob Kummerow, 2013/02/08 12:45:49]

nit: methods before properties

[Michael Starzinger, 2013/02/11 12:13:22]

Done (also for the other builders below).

+  };
+
   class IfBuilder {
    public:
     IfBuilder(HGraphBuilder* builder,
               BailoutId id = BailoutId::StubEntry());
     ~IfBuilder() {
       if (!finished_) End();
     }
 
     void BeginTrue(HValue* left, HValue* right, Token::Value token);
     void BeginFalse();
@@ skipping 729 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_