Bugfix in hydrogen array literal code generation.

src/hydrogen.cc

 // 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 6046 matching lines @@
     AddInstruction(new(zone()) HPushArgument(AddInstruction(
         new(zone()) HConstant(constants))));
 
     Runtime::FunctionId function_id = (expr->depth() > 1)
         ? Runtime::kCreateArrayLiteral : Runtime::kCreateArrayLiteralShallow;
     literal = AddInstruction(
         new(zone()) HCallRuntime(context,
                                  isolate()->factory()->empty_string(),
                                  Runtime::FunctionForId(function_id),
                                  3));
+
+    // De-opt if elements kind changed from boilerplate_elements_kind

[Yang, 2013/06/19 13:40:30]

add a period at the end of the comment.

[mvstanton, 2013/06/19 13:46:51]

Done.

+    Handle<Map> map = Handle<Map>(original_boilerplate_object->map(),
+                                  isolate());
+    AddInstruction(HCheckMaps::New(literal, map, zone()));
   }
 
   // The array is expected in the bailout environment during computation
   // of the property values and is the value of the entire expression.
   Push(literal);
   // The literal index is on the stack, too.
   Push(AddInstruction(new(zone()) HConstant(expr->literal_index())));
 
   HInstruction* elements = NULL;
 
@@ skipping 5570 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal