Build fast literals in hydrogen.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 6dea1a6807479cc66e6970d070b1e51361626c7f..3f2841d3a3f47997a4b33cdcfb66ecf66ea29962 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -1183,6 +1183,11 @@ class HOptimizedGraphBuilder: public HGraphBuilder, public AstVisitor {
   static const int kUnlimitedMaxInlinedNodes = 10000;
   static const int kUnlimitedMaxInlinedNodesCumulative = 10000;
 
+  // Maximum depth and total number of elements and properties for literal
+  // graphs to be considered for fast deep-copying.
+  static const int kMaxLiteralDepth = 3;

[Michael Starzinger, 2013/04/03 09:23:23]

We should name this "kMaxFastLiteralDepth" and "kMaxFastLiteralProperties" I
think.

[Hannes Payer (out of office), 2013/04/08 11:03:00]

Done.

+  static const int kMaxLiteralProperties = 8;
+
   // Simple accessors.
   void set_function_state(FunctionState* state) { function_state_ = state; }
 
@@ -1453,6 +1458,19 @@ class HOptimizedGraphBuilder: public HGraphBuilder, public AstVisitor {
 
   HInstruction* BuildThisFunction();
 
+  HInstruction* BuildFastLiteral(HValue* context,
+                                 Handle<JSObject> boilerplate_object,
+                                 int size,
+                                 AllocationSiteMode mode,
+                                 BailoutId id);
+
+  void BuildEmitDeepCopy(Handle<JSObject> object,
+                         HInstruction* result,
+                         HInstruction* source,
+                         int* offset,
+                         AllocationSiteMode mode,
+                         BailoutId id);
+
   void AddCheckPrototypeMaps(Handle<JSObject> holder,
                              Handle<Map> receiver_map);