scoped_fast_native_object_access.h revision 2b7c4d196c8abe32f4ca633534917da9de53c359 
1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ART_RUNTIME_NATIVE_SCOPED_FAST_NATIVE_OBJECT_ACCESS_H_
18#define ART_RUNTIME_NATIVE_SCOPED_FAST_NATIVE_OBJECT_ACCESS_H_
19
20#include "mirror/art_method.h"
21#include "scoped_thread_state_change.h"
22
23namespace art {
24
25// Variant of ScopedObjectAccess that does no runnable transitions. Should only be used by "fast"
26// JNI methods.
27class ScopedFastNativeObjectAccess : public ScopedObjectAccessAlreadyRunnable {
28 public:
29  explicit ScopedFastNativeObjectAccess(JNIEnv* env)
30    LOCKS_EXCLUDED(Locks::thread_suspend_count_lock_)
31    SHARED_LOCK_FUNCTION(Locks::mutator_lock_) ALWAYS_INLINE
32     : ScopedObjectAccessAlreadyRunnable(env) {
33    Locks::mutator_lock_->AssertSharedHeld(Self());
34    DCHECK((*Self()->GetManagedStack()->GetTopQuickFrame())->IsFastNative());
35    // Don't work with raw objects in non-runnable states.
36    DCHECK_EQ(Self()->GetState(), kRunnable);
37  }
38
39  ~ScopedFastNativeObjectAccess() UNLOCK_FUNCTION(Locks::mutator_lock_) ALWAYS_INLINE {
40  }
41
42 private:
43  DISALLOW_COPY_AND_ASSIGN(ScopedFastNativeObjectAccess);
44};
45
46}  // namespace art
47
48#endif  // ART_RUNTIME_NATIVE_SCOPED_FAST_NATIVE_OBJECT_ACCESS_H_
49