/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "arch/context.h"
#include "art_method-inl.h"
#include "jni.h"
#include "oat_quick_method_header.h"
#include "scoped_thread_state_change.h"
#include "stack.h"
#include "thread.h"

namespace art {

namespace {

class TestVisitor : public StackVisitor {
 public:
  TestVisitor(Thread* thread, Context* context) SHARED_REQUIRES(Locks::mutator_lock_)
      : StackVisitor(thread, context, StackVisitor::StackWalkKind::kIncludeInlinedFrames) {}

  bool VisitFrame() SHARED_REQUIRES(Locks::mutator_lock_) {
    ArtMethod* m = GetMethod();
    std::string m_name(m->GetName());

    if (m_name.compare("testLiveArgument") == 0) {
      found_method_ = true;
      uint32_t value = 0;
      CHECK(GetVReg(m, 0, kIntVReg, &value));
      CHECK_EQ(value, 42u);
    } else if (m_name.compare("$opt$noinline$testIntervalHole") == 0) {
      uint32_t number_of_dex_registers = m->GetCodeItem()->registers_size_;
      uint32_t dex_register_of_first_parameter = number_of_dex_registers - 2;
      found_method_ = true;
      uint32_t value = 0;
      if (GetCurrentQuickFrame() != nullptr &&
          GetCurrentOatQuickMethodHeader()->IsOptimized() &&
          !Runtime::Current()->IsDebuggable()) {
        CHECK_EQ(GetVReg(m, dex_register_of_first_parameter, kIntVReg, &value), false);
      } else {
        CHECK(GetVReg(m, dex_register_of_first_parameter, kIntVReg, &value));
        CHECK_EQ(value, 1u);
      }
    }

    return true;
  }

  // Value returned to Java to ensure the methods testSimpleVReg and testPairVReg
  // have been found and tested.
  bool found_method_ = false;
};

extern "C" JNIEXPORT void JNICALL Java_Main_doStaticNativeCallLiveVreg(JNIEnv*, jclass) {
  ScopedObjectAccess soa(Thread::Current());
  std::unique_ptr<Context> context(Context::Create());
  TestVisitor visitor(soa.Self(), context.get());
  visitor.WalkStack();
  CHECK(visitor.found_method_);
}

}  // namespace

}  // namespace art
