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// SPDX-FileCopyrightInfo: Copyright © DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
#include <cstdint>
#include <new>
#include <tuple>
#include <utility>
#include <dune/common/debugalign.hh>
#include <dune/common/hybridutilities.hh>
#include <dune/common/parallel/mpihelper.hh>
#include <dune/common/test/arithmetictestsuite.hh>
#include <dune/common/test/testsuite.hh>
class WithViolatedAlignmentHandler {
Dune::ViolatedAlignmentHandler oldhandler;
public:
template<class H>
WithViolatedAlignmentHandler(H &&newhandler) :
oldhandler(Dune::violatedAlignmentHandler())
{
Dune::violatedAlignmentHandler() = std::forward<H>(newhandler);
}
WithViolatedAlignmentHandler(const WithViolatedAlignmentHandler &) = delete;
WithViolatedAlignmentHandler(WithViolatedAlignmentHandler &&) = delete;
WithViolatedAlignmentHandler&
operator=(const WithViolatedAlignmentHandler &) = delete;
WithViolatedAlignmentHandler&
operator=(WithViolatedAlignmentHandler &&) = delete;
~WithViolatedAlignmentHandler()
{
Dune::violatedAlignmentHandler() = oldhandler;
}
};
// intentionally violate alignment and check that that is detected
template<class T>
void checkAlignmentViolation(Dune::TestSuite &test)
{
bool misalignmentDetected = false;
WithViolatedAlignmentHandler
guard([&](auto&&...){ misalignmentDetected = true; });
static_assert(alignof(T) <= sizeof(T));
char buffer[alignof(T)+sizeof(T)];
void* misalignedAddr = std::addressof(buffer);
{
// take any address, align it to the correct value...
std::size_t space = alignof(T)+sizeof(T);
misalignedAddr = std::align(alignof(T), sizeof(T), misalignedAddr, space);
// and move one past its alignmed address to make sure it's misalingned
misalignedAddr = static_cast<char*>(misalignedAddr) + 1;
test.check(not Dune::isAligned(misalignedAddr, alignof(T)), "We could not misalign an address");
}
auto ptr = new(misalignedAddr) T;
test.check(misalignmentDetected, "default construct")
<< "misalignment not detected for " << Dune::className<T>();
misalignmentDetected = false;
ptr = new(misalignedAddr) T(T(0));
test.check(misalignmentDetected, "move construct")
<< "misalignment not detected for " << Dune::className<T>();
ptr->~T();
misalignmentDetected = false;
T t(0);
ptr = new(misalignedAddr) T(t);
test.check(misalignmentDetected, "copy construct")
<< "misalignment not detected for " << Dune::className<T>();
ptr->~T();
}
int main(int argc, char **argv)
{
Dune::MPIHelper::instance(argc, argv);
Dune::ArithmeticTestSuite test;
using ArithmeticTypes = std::tuple<
bool,
char, signed char, unsigned char,
short, unsigned short,
int, unsigned,
long, long unsigned,
long long, long long unsigned,
wchar_t, char16_t, char32_t,
float, double, long double>;
Dune::Hybrid::forEach(ArithmeticTypes(), [&](auto val) {
using T = decltype(val);
using Aligned = Dune::AlignedNumber<T>;
test.checkArithmetic<Aligned, T>();
if (alignof(T) > 1)
checkAlignmentViolation<Aligned>(test);
});
return test.exit();
}
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