third_party/llvm-project/libcxx/test/libcxx/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_from_underaligned_buffer.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11, c++14
// XFAIL: availability-pmr-missing

// <memory_resource>

// class monotonic_buffer_resource

#include <cassert>
#include <memory_resource>

#include "count_new.h"
#include "test_macros.h"

int main(int, char**) {
  globalMemCounter.reset();
  {
    alignas(4) char buffer[17];
    auto mono1                    = std::pmr::monotonic_buffer_resource(buffer, 16, std::pmr::new_delete_resource());
    std::pmr::memory_resource& r1 = mono1;

    void* ret = r1.allocate(1, 1);
    assert(ret == buffer + 15);
    mono1.release();

    ret = r1.allocate(1, 2);
    assert(ret == buffer + 14);
    mono1.release();

    ret = r1.allocate(1, 4);
    assert(ret == buffer + 12);
    mono1.release();

    // Test a size that is just big enough to fit in the buffer,
    // but can't fit if it's aligned.
    {
      auto mono2 = std::pmr::monotonic_buffer_resource(buffer + 1, 16, std::pmr::new_delete_resource());
      std::pmr::memory_resource& r2 = mono2;
      ret                           = r2.allocate(16, 1);
      assert(ret == buffer + 1);
      mono2.release();

      assert(globalMemCounter.checkNewCalledEq(0));
      ret = r2.allocate(16, 2);
      ASSERT_WITH_LIBRARY_INTERNAL_ALLOCATIONS(globalMemCounter.checkNewCalledEq(1));
      ASSERT_WITH_LIBRARY_INTERNAL_ALLOCATIONS(globalMemCounter.checkLastNewSizeGe(16));
      mono2.release();
      ASSERT_WITH_LIBRARY_INTERNAL_ALLOCATIONS(globalMemCounter.checkDeleteCalledEq(1));
    }
  }

  return 0;
}