Add intrinsic for Reference.get()

Added an intrinsic function for Reference.get(). Return immediately
without going through JNI if the slow path is not currently in use.
Otherwise, branch off to the the existing JNI function.

Approximately 47x speedup for cases where slow path is not enabled.

Change-Id: I13ad65a356fe4e104d8d83980694dc2740d7d039

1 files changed, 43 insertions, 0 deletions

diff --git a/runtime/mirror/reference.cc b/runtime/mirror/reference.cc
new file mode 100644
index 0000000..533aaca
--- /dev/null
+++ b/runtime/mirror/reference.cc
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "reference.h"
+
+namespace art {
+namespace mirror {
+
+ReferenceClass* Reference::java_lang_ref_Reference_ = nullptr;
+
+void Reference::SetClass(ReferenceClass* java_lang_ref_Reference) {
+  CHECK(java_lang_ref_Reference_ == nullptr);
+  CHECK(java_lang_ref_Reference != nullptr);
+  java_lang_ref_Reference_ = java_lang_ref_Reference;
+}
+
+void Reference::ResetClass() {
+  CHECK(java_lang_ref_Reference_ != nullptr);
+  java_lang_ref_Reference_ = nullptr;
+}
+
+void Reference::VisitRoots(RootCallback* callback, void* arg) {
+  if (java_lang_ref_Reference_ != nullptr) {
+    callback(reinterpret_cast<mirror::Object**>(&java_lang_ref_Reference_),
+             arg, 0, kRootStickyClass);
+  }
+}
+
+}  // namespace mirror
+}  // namespace art