1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14
10// TODO: Change to XFAIL once https://github.com/llvm/llvm-project/issues/40340 is fixed
11// UNSUPPORTED: availability-pmr-missing
12
13// <memory_resource>
14
15// class monotonic_buffer_resource
16
17#include <cassert>
18#include <cstddef>
19#include <memory_resource>
20
21#include "test_macros.h"
22#include "count_new.h"
23
24int main(int, char**) {
25 globalMemCounter.reset();
26 auto mono1 = std::pmr::monotonic_buffer_resource(1024, std::pmr::new_delete_resource());
27 std::pmr::memory_resource& r1 = mono1;
28
29 constexpr std::size_t big_alignment = 8 * alignof(std::max_align_t);
30 static_assert(big_alignment > 4);
31
32 void* ret = r1.allocate(bytes: 2048, alignment: big_alignment);
33 assert(ret != nullptr);
34 ASSERT_WITH_LIBRARY_INTERNAL_ALLOCATIONS(globalMemCounter.checkNewCalledEq(1));
35 ASSERT_WITH_LIBRARY_INTERNAL_ALLOCATIONS(globalMemCounter.checkAlignedNewCalledEq(1));
36 ASSERT_WITH_LIBRARY_INTERNAL_ALLOCATIONS(globalMemCounter.checkLastNewSizeGe(2048));
37 ASSERT_WITH_LIBRARY_INTERNAL_ALLOCATIONS(globalMemCounter.checkLastNewAlignEq(big_alignment));
38
39 // Check that a single highly aligned allocation request doesn't
40 // permanently "poison" the resource to allocate only super-aligned
41 // blocks of memory.
42 ret = r1.allocate(bytes: globalMemCounter.last_new_size, alignment: 4);
43 assert(ret != nullptr);
44 ASSERT_WITH_LIBRARY_INTERNAL_ALLOCATIONS(globalMemCounter.checkNewCalledEq(2));
45 ASSERT_WITH_LIBRARY_INTERNAL_ALLOCATIONS(globalMemCounter.checkAlignedNewCalledEq(1));
46
47 return 0;
48}
49

source code of libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.mem/allocate_overaligned_request.pass.cpp