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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 "scoped_thread_state_change-inl.h"
     31 #include "stack.h"
     32 #include "thread-current-inl.h"
     33 
     34 namespace art {
     35 
     36 extern "C" JNIEXPORT void JNICALL Java_Main_testVisitLocks(JNIEnv*, jclass) {
     37   ScopedObjectAccess soa(Thread::Current());
     38 
     39   class VisitLocks : public StackVisitor {
     40    public:
     41     VisitLocks(Thread* thread, Context* context)
     42         : StackVisitor(thread, context, StackWalkKind::kIncludeInlinedFrames) {
     43     }
     44 
     45     bool VisitFrame() OVERRIDE REQUIRES_SHARED(Locks::mutator_lock_) {
     46       ArtMethod* m = GetMethod();
     47 
     48       // Ignore runtime methods.
     49       if (m == nullptr || m->IsRuntimeMethod()) {
     50         return true;
     51       }
     52 
     53       if (m->PrettyMethod() == "void TestSync.run()") {
     54         // Interesting frame.
     55         Monitor::VisitLocks(this, Callback, nullptr);
     56         return false;
     57       }
     58 
     59       return true;
     60     }
     61 
     62     static void Callback(mirror::Object* obj, void*) REQUIRES_SHARED(Locks::mutator_lock_) {
     63       CHECK(obj != nullptr);
     64       CHECK(obj->IsString());
     65       std::cerr << obj->AsString()->ToModifiedUtf8() << std::endl;
     66     }
     67   };
     68   Context* context = Context::Create();
     69   VisitLocks vl(soa.Self(), context);
     70   vl.WalkStack();
     71   delete context;
     72 }
     73 
     74 }  // namespace art
     75