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 "art_method-inl.h"
21 #include "scoped_thread_state_change.h"
22 
23 namespace art {
24 
25 // Variant of ScopedObjectAccess that does no runnable transitions. Should only be used by "fast"
26 // JNI methods.
27 class ScopedFastNativeObjectAccess : public ScopedObjectAccessAlreadyRunnable {
28  public:
ScopedFastNativeObjectAccess(JNIEnv * env)29   explicit ScopedFastNativeObjectAccess(JNIEnv* env)
30     REQUIRES(!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 
UNLOCK_FUNCTION(Locks::mutator_lock_)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