Add small thread-local cache for use by the interpreter.
Small (one page) cache which can be used on the hottest paths
in the interpreter and which does not require synchronisation.
This CL adds the code but it does not use it for anything yet.
Test: test-art-host-gtest
Change-Id: I41d4e7a86a0f62f7a4efc165b8934232b4e766c7
diff --git a/runtime/interpreter/interpreter_cache.cc b/runtime/interpreter/interpreter_cache.cc
new file mode 100644
index 0000000..e43fe31
--- /dev/null
+++ b/runtime/interpreter/interpreter_cache.cc
@@ -0,0 +1,32 @@
+/*
+ * 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.
+ */
+
+#include "interpreter_cache.h"
+#include "thread-inl.h"
+
+namespace art {
+
+void InterpreterCache::Clear(Thread* owning_thread) {
+ DCHECK(owning_thread->GetInterpreterCache() == this);
+ DCHECK(owning_thread == Thread::Current() || owning_thread->IsSuspended());
+ data_.fill(Entry{});
+}
+
+bool InterpreterCache::IsCalledFromOwningThread() {
+ return Thread::Current()->GetInterpreterCache() == this;
+}
+
+} // namespace art