Compile FastCloneShallowObjectStub using Crankshaft.

src/code-stubs-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 114 matching lines @@
   explicit CodeStubGraphBuilder(Stub* stub)
       : CodeStubGraphBuilderBase(Isolate::Current(), stub) {}
 
  protected:
   virtual void BuildCodeStub();
   Stub* casted_stub() { return static_cast<Stub*>(stub()); }
 };
 
 
 template <>
+void CodeStubGraphBuilder<FastCloneShallowObjectStub>::BuildCodeStub() {
+  Zone* zone = this->zone();
+  Factory* factory = isolate()->factory();
+
+  HInstruction* boilerplate =
+      AddInstruction(new(zone) HLoadKeyed(GetParameter(0),
+                                          GetParameter(1),
+                                          NULL,
+                                          FAST_ELEMENTS));
+
+  CheckBuilder builder(this);
+  builder.CheckNotUndefined(boilerplate);
+
+  int size = JSObject::kHeaderSize + casted_stub()->length() * kPointerSize;
+  HValue* boilerplate_size =
+      AddInstruction(new(zone) HInstanceSize(boilerplate));
+  HValue* size_in_words =
+      AddInstruction(new(zone) HConstant(size >> kPointerSizeLog2,
+                                         Representation::Integer32()));
+  builder.CheckIntegerEq(boilerplate_size, size_in_words);
+
+  HValue* size_in_bytes =
+      AddInstruction(new(zone) HConstant(size, Representation::Integer32()));
+  HInstruction* object =
+      AddInstruction(new(zone) HAllocate(context(),
+                                         size_in_bytes,
+                                         HType::JSObject(),
+                                         HAllocate::CAN_ALLOCATE_IN_NEW_SPACE));
+
+  for (int i = 0; i < size; i += kPointerSize) {
+    HInstruction* value =
+        AddInstruction(new(zone) HLoadNamedField(boilerplate,
+                                                 true, i));

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

nit: fits on last line

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

Done.

+    AddInstruction(new(zone) HStoreNamedField(object,
+                                              factory->empty_symbol(),
+                                              value,
+                                              true, i));
+    AddSimulate(BailoutId::StubEntry());
+  }
+
+  builder.End();
+
+  HReturn* ret = new(zone) HReturn(object, context());
+  current_block()->Finish(ret);
+}
+
+
+Handle<Code> FastCloneShallowObjectStub::GenerateCode() {
+  CodeStubGraphBuilder<FastCloneShallowObjectStub> builder(this);
+  LChunk* chunk = OptimizeGraph(builder.CreateGraph());
+  return chunk->Codegen(Code::COMPILED_STUB);
+}
+
+
+template <>
 void CodeStubGraphBuilder<KeyedLoadFastElementStub>::BuildCodeStub() {
   Zone* zone = this->zone();
 
   HInstruction* load = BuildUncheckedMonomorphicElementAccess(
       GetParameter(0), GetParameter(1), NULL, NULL,
       casted_stub()->is_js_array(), casted_stub()->elements_kind(),
       false, Representation::Tagged());
   AddInstruction(load);
 
   HReturn* ret = new(zone) HReturn(load, context());
@@ skipping 99 matching lines @@
 
 
 Handle<Code> TransitionElementsKindStub::GenerateCode() {
   CodeStubGraphBuilder<TransitionElementsKindStub> builder(this);
   LChunk* chunk = OptimizeGraph(builder.CreateGraph());
   return chunk->Codegen(Code::COMPILED_STUB);
 }
 
 
 } }  // namespace v8::internal