llvm/libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/new.size_align_nothrow.replace.indirect.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
//
//===----------------------------------------------------------------------===//

// void* operator new[](std::size_t, std::align_val_t, std::nothrow_t const&);

// Test that we can replace the operator by replacing `operator new[](std::size_t, std::align_val_t)`
// (the throwing version).

// This doesn't work when the shared library was built with exceptions disabled, because
// we can't implement the non-throwing new from the throwing new in that case.
// XFAIL: no-exceptions

// UNSUPPORTED: c++03, c++11, c++14
// UNSUPPORTED: sanitizer-new-delete

// XFAIL: LIBCXX-AIX-FIXME

// Libc++ when built for z/OS doesn't contain the aligned allocation functions,
// nor does the dynamic library shipped with z/OS.
// XFAIL: target={{.+}}-zos{{.*}}

#include <new>
#include <cstddef>
#include <cstdlib>
#include <cassert>
#include <limits>

#include "test_macros.h"
#include "../types.h"

int new_called = 0;
int delete_called = 0;

alignas(OverAligned) char DummyData[alignof(OverAligned) * 3];

TEST_WORKAROUND_BUG_109234844_WEAK
void* operator new[](std::size_t s, std::align_val_t a) {
    assert(s <= sizeof(DummyData));
    assert(static_cast<std::size_t>(a) == alignof(OverAligned));
    ++new_called;
    return DummyData;
}

void operator delete[](void*, std::align_val_t) noexcept {
    ++delete_called;
    // nothing to delete, we didn't actually allocate in `operator new`
}

int main(int, char**) {
    // Test with an overaligned type
    {
        new_called = delete_called = 0;
        OverAligned* dummy_data_block = new (std::nothrow) OverAligned[3];
        OverAligned* x                = DoNotOptimize(dummy_data_block);
        ASSERT_WITH_OPERATOR_NEW_FALLBACKS(static_cast<void*>(x) == DummyData);
        ASSERT_WITH_OPERATOR_NEW_FALLBACKS(new_called == 1);

        delete[] dummy_data_block;
        ASSERT_WITH_OPERATOR_NEW_FALLBACKS(delete_called == 1);
    }

    // Test with a type that is right on the verge of being overaligned
    {
        new_called = delete_called = 0;
        MaxAligned* x = DoNotOptimize(new (std::nothrow) MaxAligned[3]);
        assert(x != nullptr);
        assert(new_called == 0);

        delete[] x;
        assert(delete_called == 0);
    }

    // Test with a type that is clearly not overaligned
    {
        new_called = delete_called = 0;
        int* x = DoNotOptimize(new (std::nothrow) int[3]);
        assert(x != nullptr);
        assert(new_called == 0);

        delete[] x;
        assert(delete_called == 0);
    }

    return 0;
}