1 files changed, 62 insertions, 0 deletions
diff --git a/runtime/write_barrier.h b/runtime/write_barrier.h
new file mode 100644
index 0000000000..112154e14a
--- /dev/null
+++ b/runtime/write_barrier.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#ifndef ART_RUNTIME_WRITE_BARRIER_H_
+#define ART_RUNTIME_WRITE_BARRIER_H_
+
+#include "base/macros.h"
+
+namespace art {
+
+namespace gc {
+namespace accounting {
+class CardTable;
+}  // namespace accounting
+}  // namespace gc
+
+class WriteBarrier {
+ public:
+  enum NullCheck {
+    kWithoutNullCheck,
+    kWithNullCheck,
+  };
+
+  // Must be called if a reference field of an Object in the heap changes, and before any GC
+  // safe-point. The call is not needed if null is stored in the field.
+  template <NullCheck kNullCheck = kWithNullCheck>
+  ALWAYS_INLINE static void ForFieldWrite(ObjPtr<mirror::Object> dst,
+                                          MemberOffset offset ATTRIBUTE_UNUSED,
+                                          ObjPtr<mirror::Object> new_value ATTRIBUTE_UNUSED)
+      REQUIRES_SHARED(Locks::mutator_lock_);
+
+  // Must be called if a reference field of an ObjectArray in the heap changes, and before any GC
+  // safe-point. The call is not needed if null is stored in the field.
+  ALWAYS_INLINE static void ForArrayWrite(ObjPtr<mirror::Object> dst,
+                                          int start_offset ATTRIBUTE_UNUSED,
+                                          size_t length ATTRIBUTE_UNUSED)
+      REQUIRES_SHARED(Locks::mutator_lock_);
+
+  // Write barrier for every reference field in an object.
+  ALWAYS_INLINE static void ForEveryFieldWrite(ObjPtr<mirror::Object> obj)
+      REQUIRES_SHARED(Locks::mutator_lock_);
+
+ private:
+  ALWAYS_INLINE static gc::accounting::CardTable* GetCardTable();
+};
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_WRITE_BARRIER_H_