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      1 /*
      2  * Copyright (C) 2017 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 "jni.h"
     18 
     19 #include <iostream>
     20 
     21 #include "android-base/logging.h"
     22 
     23 #include "arch/context.h"
     24 #include "art_method.h"
     25 #include "base/macros.h"
     26 #include "base/mutex.h"
     27 #include "mirror/object-inl.h"
     28 #include "mirror/string.h"
     29 #include "monitor.h"
     30 #include "obj_ptr-inl.h"
     31 #include "scoped_thread_state_change-inl.h"
     32 #include "stack.h"
     33 #include "thread-current-inl.h"
     34 
     35 namespace art {
     36 
     37 extern "C" JNIEXPORT void JNICALL Java_Main_testVisitLocks(JNIEnv*, jclass) {
     38   ScopedObjectAccess soa(Thread::Current());
     39 
     40   class VisitLocks : public StackVisitor {
     41    public:
     42     VisitLocks(Thread* thread, Context* context)
     43         : StackVisitor(thread, context, StackWalkKind::kIncludeInlinedFrames) {
     44     }
     45 
     46     bool VisitFrame() override REQUIRES_SHARED(Locks::mutator_lock_) {
     47       ArtMethod* m = GetMethod();
     48 
     49       // Ignore runtime methods.
     50       if (m == nullptr || m->IsRuntimeMethod()) {
     51         return true;
     52       }
     53 
     54       if (m->PrettyMethod() == "void TestSync.run()") {
     55         // Interesting frame.
     56         Monitor::VisitLocks(this, Callback, nullptr);
     57         return false;
     58       }
     59 
     60       return true;
     61     }
     62 
     63     static void Callback(ObjPtr<mirror::Object> obj, void*) REQUIRES_SHARED(Locks::mutator_lock_) {
     64       CHECK(obj != nullptr);
     65       CHECK(obj->IsString());
     66       std::cerr << obj->AsString()->ToModifiedUtf8() << std::endl;
     67     }
     68   };
     69   Context* context = Context::Create();
     70   VisitLocks vl(soa.Self(), context);
     71   vl.WalkStack();
     72   delete context;
     73 }
     74 
     75 }  // namespace art
     76