Revert "Revert "Add intrinsic for Reference.get()""
This reverts commit a9b870b73a155ce70c867d5b3f9758fab0b45f07.
Change-Id: Ic2a9b47f2b911bef4b764d10bc33cf000e4b4211
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
diff --git a/runtime/mirror/reference.h b/runtime/mirror/reference.h
index 9c9d87b..15e0145 100644
--- a/runtime/mirror/reference.h
+++ b/runtime/mirror/reference.h
@@ -17,7 +17,10 @@
#ifndef ART_RUNTIME_MIRROR_REFERENCE_H_
#define ART_RUNTIME_MIRROR_REFERENCE_H_
+#include "class.h"
#include "object.h"
+#include "object_callbacks.h"
+#include "thread.h"
namespace art {
@@ -29,9 +32,11 @@
} // namespace gc
struct ReferenceOffsets;
+struct ReferenceClassOffsets;
struct FinalizerReferenceOffsets;
namespace mirror {
+class ReferenceClass;
// C++ mirror of java.lang.ref.Reference
class MANAGED Reference : public Object {
@@ -80,6 +85,15 @@
bool IsEnqueuable() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+ static ReferenceClass* GetJavaLangRefReference() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+ CHECK(java_lang_ref_Reference_ != nullptr);
+ return ReadBarrier::BarrierForRoot<mirror::ReferenceClass, kWithReadBarrier>(
+ &java_lang_ref_Reference_);
+ }
+ static void SetClass(ReferenceClass* klass);
+ static void ResetClass(void);
+ static void VisitRoots(RootCallback* callback, void* arg);
+
private:
// Note: This avoids a read barrier, it should only be used by the GC.
HeapReference<Object>* GetReferentReferenceAddr() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
@@ -92,12 +106,46 @@
HeapReference<Reference> queue_next_; // Note this is Java volatile:
HeapReference<Object> referent_; // Note this is Java volatile:
+ static ReferenceClass* java_lang_ref_Reference_;
+
friend struct art::ReferenceOffsets; // for verifying offset information
friend class gc::ReferenceProcessor;
friend class gc::ReferenceQueue;
DISALLOW_IMPLICIT_CONSTRUCTORS(Reference);
};
+// Tightly coupled with the ReferenceProcessor to provide switch for slow/fast path. Consistency
+// is maintained by ReferenceProcessor.
+class MANAGED ReferenceClass : public Class {
+ public:
+ static MemberOffset DisableIntrinsicOffset() {
+ return OFFSET_OF_OBJECT_MEMBER(ReferenceClass, disable_intrinsic_);
+ }
+ static MemberOffset SlowPathEnabledOffset() {
+ return OFFSET_OF_OBJECT_MEMBER(ReferenceClass, slow_path_enabled_);
+ }
+
+ void Init() {
+ disable_intrinsic_ = false;
+ slow_path_enabled_ = false;
+ }
+
+ bool GetSlowPathEnabled() const {
+ return slow_path_enabled_;
+ }
+ void SetSlowPathEnabled(bool enabled) {
+ slow_path_enabled_ = enabled;
+ }
+
+ private:
+ int32_t disable_intrinsic_;
+ int32_t slow_path_enabled_;
+ // allows runtime to safely enable/disable intrinsics fast path for benchmarking
+
+ friend struct art::ReferenceClassOffsets; // for verifying offset information
+ DISALLOW_IMPLICIT_CONSTRUCTORS(ReferenceClass);
+};
+
// C++ mirror of java.lang.ref.FinalizerReference
class MANAGED FinalizerReference : public Reference {
public: