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memory: avoid undefined behaviour from downcasting ptr implentation (#5)

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* sharedptr: dont downcast ptr implentation

avoid runtime errors of wrong downcasts by adding a underlaying ptr data
getter and only cast the data, downcasting the implentation type isnt
inherited from eachother, while the intention was do upcast/downcast
a derived class to a base class. found with UBSAN "runtime error:
downcast of address which does not point to an object of type
"CSharedPointer_::impl<IKeyboard>" note: object is of type
"Hyprutils::Memory::CSharedPointer_::impl<CKeyboard>"

also make dataNonNull check against != nullptr.

* sharedptr: use reinterpret_cast instead of c style

make it more type safe, C style casts tries every single one until one
works, or not. compilers also produces better warnings/errors when using
c++ casts in favour of C style ones.
This commit is contained in:
Tom Englund 2024-06-28 18:49:58 +02:00 committed by GitHub
parent 1f6bbec595
commit 7e1b6610a2
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GPG key ID: B5690EEEBB952194
2 changed files with 13 additions and 8 deletions
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11
include/hyprutils/memory/SharedPtr.hpp
View file

@ -31,6 +31,7 @@ namespace Hyprutils {
virtual void destroy() noexcept = 0;
virtual bool destroying() noexcept = 0;
virtual bool dataNonNull() noexcept = 0;
virtual void* getData() noexcept = 0;
};
template <typename T>
@ -107,6 +108,10 @@ namespace Hyprutils {
}
virtual bool dataNonNull() noexcept {
return _data != nullptr;
}
virtual void* getData() noexcept {
return _data;
}
@ -213,11 +218,11 @@ namespace Hyprutils {
}
bool operator()(const CSharedPointer& lhs, const CSharedPointer& rhs) const {
return (uintptr_t)lhs.impl_ < (uintptr_t)rhs.impl_;
return reinterpret_cast<uintptr_t>(lhs.impl_) < reinterpret_cast<uintptr_t>(rhs.impl_);
}
bool operator<(const CSharedPointer& rhs) const {
return (uintptr_t)impl_ < (uintptr_t)rhs.impl_;
return reinterpret_cast<uintptr_t>(impl_) < reinterpret_cast<uintptr_t>(rhs.impl_);
}
T* operator->() const {
@ -234,7 +239,7 @@ namespace Hyprutils {
}
T* get() const {
return (T*)(impl_ ? static_cast<CSharedPointer_::impl<T>*>(impl_)->_data : nullptr);
return impl_ ? static_cast<T*>(impl_->getData()) : nullptr;
}
unsigned int strongRef() const {

8
include/hyprutils/memory/WeakPtr.hpp
View file

@ -80,7 +80,7 @@ namespace Hyprutils {
/* create a weak ptr from a shared ptr with assignment */
template <typename U>
validHierarchy<const CWeakPointer<U>&> operator=(const CSharedPointer<U>& rhs) {
if ((uintptr_t)impl_ == (uintptr_t)rhs.impl_)
if (reinterpret_cast<uintptr_t>(impl_) == reinterpret_cast<uintptr_t>(rhs.impl_))
return *this;
decrementWeak();
@ -139,15 +139,15 @@ namespace Hyprutils {
}
bool operator()(const CWeakPointer& lhs, const CWeakPointer& rhs) const {
return (uintptr_t)lhs.impl_ < (uintptr_t)rhs.impl_;
return reinterpret_cast<uintptr_t>(lhs.impl_) < reinterpret_cast<uintptr_t>(rhs.impl_);
}
bool operator<(const CWeakPointer& rhs) const {
return (uintptr_t)impl_ < (uintptr_t)rhs.impl_;
return reinterpret_cast<uintptr_t>(impl_) < reinterpret_cast<uintptr_t>(rhs.impl_);
}
T* get() const {
return (T*)(impl_ ? static_cast<CSharedPointer_::impl<T>*>(impl_)->_data : nullptr);
return impl_ ? static_cast<T*>(impl_->getData()) : nullptr;
}
T* operator->() const {