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 
24 int 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(2048, 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(globalMemCounter.last_new_size, 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