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      1 /*
      2  * Copyright (C) 2014 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 #include "gc/heap.h"
     18 #include "gc/reference_processor.h"
     19 #include "jni_internal.h"
     20 #include "mirror/object-inl.h"
     21 #include "mirror/reference-inl.h"
     22 #include "scoped_fast_native_object_access.h"
     23 
     24 namespace art {
     25 
     26 static jobject Reference_getReferent(JNIEnv* env, jobject javaThis) {
     27   ScopedFastNativeObjectAccess soa(env);
     28   mirror::Reference* const ref = soa.Decode<mirror::Reference*>(javaThis);
     29   mirror::Object* const referent =
     30       Runtime::Current()->GetHeap()->GetReferenceProcessor()->GetReferent(soa.Self(), ref);
     31   return soa.AddLocalReference<jobject>(referent);
     32 }
     33 
     34 static JNINativeMethod gMethods[] = {
     35   NATIVE_METHOD(Reference, getReferent, "!()Ljava/lang/Object;"),
     36 };
     37 
     38 void register_java_lang_ref_Reference(JNIEnv* env) {
     39   REGISTER_NATIVE_METHODS("java/lang/ref/Reference");
     40 }
     41 
     42 }  // namespace art
     43