HSubAllocatedObject instruction allows hydrogen code to carve up

src/x64/lithium-x64.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 274 matching lines @@
 
 void LTypeofIsAndBranch::PrintDataTo(StringStream* stream) {
   stream->Add("if typeof ");
   value()->PrintTo(stream);
   stream->Add(" == \"%s\" then B%d else B%d",
               *hydrogen()->type_literal()->ToCString(),
               true_block_id(), false_block_id());
 }
 
 
+void LInnerAllocatedObject::PrintDataTo(StringStream* stream) {
+  stream->Add(" = ");
+  base_object()->PrintTo(stream);
+  stream->Add(" + %d", offset());
+}
+
+
 void LCallConstantFunction::PrintDataTo(StringStream* stream) {
   stream->Add("#%d / ", arity());
 }
 
 
 void LUnaryMathOperation::PrintDataTo(StringStream* stream) {
   stream->Add("/%s ", hydrogen()->OpName());
   value()->PrintTo(stream);
 }
 
@@ skipping 712 matching lines @@
 }
 
 
 LInstruction* LChunkBuilder::DoPushArgument(HPushArgument* instr) {
   ++argument_count_;
   LOperand* argument = UseOrConstant(instr->argument());
   return new(zone()) LPushArgument(argument);
 }
 
 
+LInstruction* LChunkBuilder::DoInnerAllocatedObject(
+    HInnerAllocatedObject* inner_object) {
+  LOperand* base_object = UseRegisterAtStart(inner_object->base_object());
+  LInnerAllocatedObject* result =
+    new(zone()) LInnerAllocatedObject(base_object);
+  return DefineAsRegister(result);
+}
+
+
 LInstruction* LChunkBuilder::DoThisFunction(HThisFunction* instr) {
   return instr->HasNoUses()
       ? NULL
       : DefineAsRegister(new(zone()) LThisFunction);
 }
 
 
 LInstruction* LChunkBuilder::DoContext(HContext* instr) {
   // If there is a non-return use, the context must be allocated in a register.
   for (HUseIterator it(instr->uses()); !it.Done(); it.Advance()) {
@@ skipping 1393 matching lines @@
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseTempRegister(instr->index());
   return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64