| 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 | // memory_resource *null_memory_resource() |
| 16 | |
| 17 | #include <memory_resource> |
| 18 | #include <cassert> |
| 19 | #include <cstddef> // size_t |
| 20 | #include <new> |
| 21 | #include <type_traits> |
| 22 | |
| 23 | #include "count_new.h" |
| 24 | #include "test_macros.h" |
| 25 | |
| 26 | struct assert_on_compare : public std::pmr::memory_resource { |
| 27 | void* do_allocate(std::size_t, size_t) override { |
| 28 | assert(false); |
| 29 | return nullptr; |
| 30 | } |
| 31 | |
| 32 | void do_deallocate(void*, std::size_t, size_t) override { assert(false); } |
| 33 | |
| 34 | bool do_is_equal(const std::pmr::memory_resource&) const noexcept override { |
| 35 | assert(false); |
| 36 | return true; |
| 37 | } |
| 38 | }; |
| 39 | |
| 40 | void test_return() { |
| 41 | { ASSERT_SAME_TYPE(decltype(std::pmr::null_memory_resource()), std::pmr::memory_resource*); } |
| 42 | // Test that the returned value is not null |
| 43 | { assert(std::pmr::null_memory_resource()); } |
| 44 | // Test the same value is returned by repeated calls. |
| 45 | { assert(std::pmr::null_memory_resource() == std::pmr::null_memory_resource()); } |
| 46 | } |
| 47 | |
| 48 | void test_equality() { |
| 49 | // Same object |
| 50 | { |
| 51 | std::pmr::memory_resource& r1 = *std::pmr::null_memory_resource(); |
| 52 | std::pmr::memory_resource& r2 = *std::pmr::null_memory_resource(); |
| 53 | // check both calls returned the same object |
| 54 | assert(&r1 == &r2); |
| 55 | // check for proper equality semantics |
| 56 | assert(r1 == r2); |
| 57 | assert(r2 == r1); |
| 58 | assert(!(r1 != r2)); |
| 59 | assert(!(r2 != r1)); |
| 60 | // check the is_equal method |
| 61 | assert(r1.is_equal(r2)); |
| 62 | assert(r2.is_equal(r1)); |
| 63 | } |
| 64 | // Different types |
| 65 | { |
| 66 | std::pmr::memory_resource& r1 = *std::pmr::null_memory_resource(); |
| 67 | assert_on_compare c; |
| 68 | std::pmr::memory_resource& r2 = c; |
| 69 | assert(r1 != r2); |
| 70 | assert(!(r1 == r2)); |
| 71 | assert(!r1.is_equal(r2)); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | void test_allocate() { |
| 76 | #ifndef TEST_HAS_NO_EXCEPTIONS |
| 77 | DisableAllocationGuard g; // null_memory_resource shouldn't allocate. |
| 78 | try { |
| 79 | (void)std::pmr::null_memory_resource()->allocate(bytes: 1); |
| 80 | assert(false); |
| 81 | } catch (std::bad_alloc const&) { |
| 82 | // do nothing |
| 83 | } catch (...) { |
| 84 | assert(false); |
| 85 | } |
| 86 | #endif |
| 87 | } |
| 88 | |
| 89 | void test_deallocate() { |
| 90 | globalMemCounter.reset(); |
| 91 | |
| 92 | int x = 42; |
| 93 | std::pmr::null_memory_resource()->deallocate(p: &x, bytes: 0); |
| 94 | |
| 95 | assert(globalMemCounter.checkDeleteCalledEq(0)); |
| 96 | assert(globalMemCounter.checkDeleteArrayCalledEq(0)); |
| 97 | } |
| 98 | |
| 99 | int main(int, char**) { |
| 100 | test_return(); |
| 101 | test_equality(); |
| 102 | test_allocate(); |
| 103 | test_deallocate(); |
| 104 | |
| 105 | return 0; |
| 106 | } |
| 107 |