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Enable copying invalid variants

Browse Source 
There was a bug where if you attempted to copy a variant that was not
valid (i.e. did not hold an object), a seg fault could happen. This has
been changed to set the target variant to also be invalid.
This commit is contained in:
Kenneth Moreland 2022-06-29 12:34:02 -06:00
parent 22ee3c3fa5
commit 5e476d7030
3 changed files with 38 additions and 5 deletions
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5
docs/changelog/copy-invalid-variant.md Normal file
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@ -0,0 +1,5 @@
# Fix bug with copying invalid variants
There was a bug where if you attempted to copy a `Variant` that was not
valid (i.e. did not hold an object); a seg fault could happen. This has
been changed to set the target variant to also be invalid.

18
vtkm/exec/internal/testing/UnitTestVariant.cxx
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@ -431,6 +431,23 @@ void TestCastAndCall()
VTKM_TEST_ASSERT(test_equal(result, TestValue(26, vtkm::FloatDefault{})));
}
void TestCopyInvalid()
{
std::cout << "Test copy invalid variant" << std::endl;
using VariantType = vtkm::exec::internal::Variant<TypePlaceholder<0>, NonTrivial>;
VariantType source;
source.Reset();
VariantType destination1(source);
VTKM_TEST_ASSERT(!destination1.IsValid());
VariantType destination2(TypePlaceholder<0>{});
destination2 = source;
VTKM_TEST_ASSERT(!destination2.IsValid());
}
struct CountConstructDestruct
{
vtkm::Id* Count;
@ -577,6 +594,7 @@ void RunTest()
TestTriviallyCopyable();
TestGet();
TestCastAndCall();
TestCopyInvalid();
TestCopyDestroy();
TestEmplace();
TestConstructDestruct();

20
vtkm/internal/VariantImpl.h
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@ -256,21 +256,31 @@ struct VariantConstructorImpl<vtkm::VTK_M_NAMESPACE::internal::Variant<Ts...>,
VTK_M_DEVICE VariantConstructorImpl(const VariantConstructorImpl& src) noexcept
: VariantStorageImpl<Ts...>(vtkm::internal::NullType{})
{
src.CastAndCall(VariantCopyConstructFunctor{}, this->Storage);
if (src.IsValid())
{
src.CastAndCall(VariantCopyConstructFunctor{}, this->Storage);
}
this->Index = src.Index;
}
VTK_M_DEVICE VariantConstructorImpl& operator=(const VariantConstructorImpl& src) noexcept
{
if (this->GetIndex() == src.GetIndex())
if (src.IsValid())
{
src.CastAndCall(detail::VariantCopyFunctor{}, this->Storage);
if (this->GetIndex() == src.GetIndex())
{
src.CastAndCall(detail::VariantCopyFunctor{}, this->Storage);
}
else
{
this->Reset();
src.CastAndCall(detail::VariantCopyConstructFunctor{}, this->Storage);
this->Index = src.Index;
}
}
else
{
this->Reset();
src.CastAndCall(detail::VariantCopyConstructFunctor{}, this->Storage);
this->Index = src.Index;
}
return *this;
}