/*
 * 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 <sys/time.h>

#include <chrono>
#include <functional>

#include <gtest/gtest.h>
#include <ScopedDisableMalloc.h>

using namespace std::chrono_literals;

class DisableMallocTest : public ::testing::Test {
 protected:
  void alarm(std::chrono::microseconds us) {
    std::chrono::seconds s = std::chrono::duration_cast<std::chrono::seconds>(us);
    itimerval t = itimerval();
    t.it_value.tv_sec = s.count();
    t.it_value.tv_usec = (us - s).count();
    setitimer(ITIMER_REAL, &t, NULL);
  }
};

TEST_F(DisableMallocTest, reenable) {
  ASSERT_EXIT({
    alarm(100ms);
    void *ptr1 = malloc(128);
    ASSERT_NE(ptr1, nullptr);
    free(ptr1);
    {
      ScopedDisableMalloc disable_malloc;
    }
    void *ptr2 = malloc(128);
    ASSERT_NE(ptr2, nullptr);
    free(ptr2);
    _exit(1);
  }, ::testing::ExitedWithCode(1), "");
}

TEST_F(DisableMallocTest, deadlock_allocate) {
  ASSERT_DEATH({
    void *ptr = malloc(128);
    ASSERT_NE(ptr, nullptr);
    free(ptr);
    {
      alarm(100ms);
      ScopedDisableMalloc disable_malloc;
      void* ptr = malloc(128);
      ASSERT_NE(ptr, nullptr);
      free(ptr);
    }
  }, "");
}

TEST_F(DisableMallocTest, deadlock_new) {
  ASSERT_DEATH({
    char* ptr = new(char);
    ASSERT_NE(ptr, nullptr);
    delete(ptr);
    {
      alarm(100ms);
      ScopedDisableMalloc disable_malloc;
      char* ptr = new (std::nothrow)(char);
      ASSERT_NE(ptr, nullptr);
      delete(ptr);
    }
  }, "");
}

TEST_F(DisableMallocTest, deadlock_delete) {
  ASSERT_DEATH({
    char* ptr = new(char);
    ASSERT_NE(ptr, nullptr);
    {
      alarm(250ms);
      ScopedDisableMalloc disable_malloc;
      delete(ptr);
      // Force ptr usage or this code gets optimized away by the arm64 compiler.
      ASSERT_NE(ptr, nullptr);
    }
  }, "");
}

TEST_F(DisableMallocTest, deadlock_free) {
  ASSERT_DEATH({
    void *ptr = malloc(128);
    ASSERT_NE(ptr, nullptr);
    {
      alarm(100ms);
      ScopedDisableMalloc disable_malloc;
      free(ptr);
    }
  }, "");
}

TEST_F(DisableMallocTest, deadlock_fork) {
  ASSERT_DEATH({
    {
      alarm(100ms);
      ScopedDisableMalloc disable_malloc;
      fork();
    }
  }, "");
}
