Test StringLengthStub generation via TurboFan.

src/compiler/code-stubs-turbofan.cc

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/code-stubs.h"
+#include "src/compiler/graph.h"
+#include "src/compiler/linkage.h"
+#include "src/compiler/pipeline.h"
+#include "src/compiler/raw-machine-assembler.h"
+#include "src/handles.h"
+
+namespace v8 {
+namespace internal {
+
+Handle<Code> StringLengthStub::GenerateCode() {
+  using namespace v8::internal::compiler;
+  CompilationInfoWithZone info(this, isolate());
+  Graph graph(info.zone());
+  CallDescriptor* descriptor = Linkage::ComputeIncoming(info.zone(), &info);
+  RawMachineAssembler m(isolate(), &graph, descriptor->GetMachineSignature());
+
+  Node* str = m.Load(kMachAnyTagged, m.Parameter(0),
+                     m.Int32Constant(JSValue::kValueOffset - kHeapObjectTag));
+  Node* len = m.Load(kMachAnyTagged, str,
+                     m.Int32Constant(String::kLengthOffset - kHeapObjectTag));
+  m.Return(len);
+
+  return Pipeline::GenerateCodeForTesting(&info, &graph, m.Export());

[titzer, 2015/02/17 11:46:46]

This method will need to be renamed to pass the presubmit checks.

+}
+
+}  // namespace internal
+}  // namespace v8