/*
 * Copyright (C) 2016 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 <gtest/gtest.h>

#include "base/unix_file/fd_file.h"
#include "art_method-inl.h"
#include "class_linker-inl.h"
#include "common_runtime_test.h"
#include "dex_file.h"
#include "mirror/class-inl.h"
#include "mirror/class_loader.h"
#include "handle_scope-inl.h"
#include "jit/offline_profiling_info.h"
#include "scoped_thread_state_change.h"

namespace art {

class ProfileCompilationInfoTest : public CommonRuntimeTest {
 protected:
  std::vector<ArtMethod*> GetVirtualMethods(jobject class_loader,
                                            const std::string& clazz) {
    ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
    Thread* self = Thread::Current();
    ScopedObjectAccess soa(self);
    StackHandleScope<1> hs(self);
    Handle<mirror::ClassLoader> h_loader(hs.NewHandle(
        reinterpret_cast<mirror::ClassLoader*>(self->DecodeJObject(class_loader))));
    mirror::Class* klass = class_linker->FindClass(self, clazz.c_str(), h_loader);

    const auto pointer_size = class_linker->GetImagePointerSize();
    std::vector<ArtMethod*> methods;
    for (auto& m : klass->GetVirtualMethods(pointer_size)) {
      methods.push_back(&m);
    }
    return methods;
  }

  bool AddData(const std::string& dex_location,
               uint32_t checksum,
               uint16_t method_index,
               ProfileCompilationInfo* info) {
    return info->AddMethodIndex(dex_location, checksum, method_index);
  }

  uint32_t GetFd(const ScratchFile& file) {
    return static_cast<uint32_t>(file.GetFd());
  }
};

TEST_F(ProfileCompilationInfoTest, SaveArtMethods) {
  ScratchFile profile;

  Thread* self = Thread::Current();
  jobject class_loader;
  {
    ScopedObjectAccess soa(self);
    class_loader = LoadDex("ProfileTestMultiDex");
  }
  ASSERT_NE(class_loader, nullptr);

  // Save virtual methods from Main.
  std::set<DexCacheResolvedClasses> resolved_classes;
  std::vector<ArtMethod*> main_methods = GetVirtualMethods(class_loader, "LMain;");
  ASSERT_TRUE(ProfileCompilationInfo::SaveProfilingInfo(profile.GetFilename(),
                                                        main_methods,
                                                        resolved_classes));

  // Check that what we saved is in the profile.
  ProfileCompilationInfo info1;
  ASSERT_TRUE(info1.Load(GetFd(profile)));
  ASSERT_EQ(info1.GetNumberOfMethods(), main_methods.size());
  {
    ScopedObjectAccess soa(self);
    for (ArtMethod* m : main_methods) {
      ASSERT_TRUE(info1.ContainsMethod(MethodReference(m->GetDexFile(), m->GetDexMethodIndex())));
    }
  }

  // Save virtual methods from Second.
  std::vector<ArtMethod*> second_methods = GetVirtualMethods(class_loader, "LSecond;");
  ASSERT_TRUE(ProfileCompilationInfo::SaveProfilingInfo(profile.GetFilename(),
                                                        second_methods,
                                                        resolved_classes));

  // Check that what we saved is in the profile (methods form Main and Second).
  ProfileCompilationInfo info2;
  ASSERT_TRUE(profile.GetFile()->ResetOffset());
  ASSERT_TRUE(info2.Load(GetFd(profile)));
  ASSERT_EQ(info2.GetNumberOfMethods(), main_methods.size() + second_methods.size());
  {
    ScopedObjectAccess soa(self);
    for (ArtMethod* m : main_methods) {
      ASSERT_TRUE(info2.ContainsMethod(MethodReference(m->GetDexFile(), m->GetDexMethodIndex())));
    }
    for (ArtMethod* m : second_methods) {
      ASSERT_TRUE(info2.ContainsMethod(MethodReference(m->GetDexFile(), m->GetDexMethodIndex())));
    }
  }
}

TEST_F(ProfileCompilationInfoTest, SaveFd) {
  ScratchFile profile;

  ProfileCompilationInfo saved_info;
  // Save a few methods.
  for (uint16_t i = 0; i < 10; i++) {
    ASSERT_TRUE(AddData("dex_location1", /* checksum */ 1, /* method_idx */ i, &saved_info));
    ASSERT_TRUE(AddData("dex_location2", /* checksum */ 2, /* method_idx */ i, &saved_info));
  }
  ASSERT_TRUE(saved_info.Save(GetFd(profile)));
  ASSERT_EQ(0, profile.GetFile()->Flush());

  // Check that we get back what we saved.
  ProfileCompilationInfo loaded_info;
  ASSERT_TRUE(profile.GetFile()->ResetOffset());
  ASSERT_TRUE(loaded_info.Load(GetFd(profile)));
  ASSERT_TRUE(loaded_info.Equals(saved_info));

  // Save more methods.
  for (uint16_t i = 0; i < 100; i++) {
    ASSERT_TRUE(AddData("dex_location1", /* checksum */ 1, /* method_idx */ i, &saved_info));
    ASSERT_TRUE(AddData("dex_location2", /* checksum */ 2, /* method_idx */ i, &saved_info));
    ASSERT_TRUE(AddData("dex_location3", /* checksum */ 3, /* method_idx */ i, &saved_info));
  }
  ASSERT_TRUE(profile.GetFile()->ResetOffset());
  ASSERT_TRUE(saved_info.Save(GetFd(profile)));
  ASSERT_EQ(0, profile.GetFile()->Flush());

  // Check that we get back everything we saved.
  ProfileCompilationInfo loaded_info2;
  ASSERT_TRUE(profile.GetFile()->ResetOffset());
  ASSERT_TRUE(loaded_info2.Load(GetFd(profile)));
  ASSERT_TRUE(loaded_info2.Equals(saved_info));
}

TEST_F(ProfileCompilationInfoTest, AddDataFail) {
  ScratchFile profile;

  ProfileCompilationInfo info;
  ASSERT_TRUE(AddData("dex_location", /* checksum */ 1, /* method_idx */ 1, &info));
  // Trying to add info for an existing file but with a different checksum.
  ASSERT_FALSE(AddData("dex_location", /* checksum */ 2, /* method_idx */ 2, &info));
}

TEST_F(ProfileCompilationInfoTest, LoadFail) {
  ScratchFile profile;

  ProfileCompilationInfo info1;
  ASSERT_TRUE(AddData("dex_location", /* checksum */ 1, /* method_idx */ 1, &info1));
  // Use the same file, change the checksum.
  ProfileCompilationInfo info2;
  ASSERT_TRUE(AddData("dex_location", /* checksum */ 2, /* method_idx */ 2, &info2));

  ASSERT_FALSE(info1.Load(info2));
}

}  // namespace art