https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95321
Bug ID: 95321
Summary: Run-time crash on valid destructor code
Product: gcc
Version: 9.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fxcoudert at gcc dot gnu.org
Target Milestone: ---
// Run-time crash with g++ >= 9 and -Ox, x > 1
// Works perfectly with g++ <= 8.3
class IDestroyable
{
protected:
virtual void Destroy() = 0;
public:
void operator delete (void * ptr)
{
if (ptr != nullptr) static_cast<IDestroyable *>(ptr)->Destroy();
}
};
class IToto
{
public:
virtual void Toto() = 0;
};
class ITotoDestroyable : public IToto, public IDestroyable
{
public:
void operator delete (void * ptr)
{
if (ptr != nullptr) delete static_cast<IDestroyable
*>(static_cast<ITotoDestroyable *>(ptr));
}
};
template <typename INTERFACE>
class DestroyableBase : public INTERFACE
{
protected:
virtual void Destroy()
{
::delete this;
}
public:
virtual ~DestroyableBase()
{
}
void operator delete (void * ptr)
{
::operator delete (ptr);
}
};
#include <iostream>
class TotoDestroyable : public DestroyableBase<ITotoDestroyable>
{
public:
~TotoDestroyable()
{
std::cout << "OK Destroyed !\n";
}
void Toto()
{
std::cout << "Toto !\n";
}
};
int main()
{
ITotoDestroyable * foo = new TotoDestroyable();
// Uncomment to workaround the crash
// foo->Toto();
delete foo;
}
Segfaults at runtime when compiled with G++ >= 9 and -O1 or higher.
Process 52619 launched: '/tmp/a.out' (x86_64)
Process 52619 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
(code=1, address=0x0)
frame #0: 0x0000000100000d44 a.out`main [inlined] IDestroyable::operator
delete(ptr=0x0000000100604858) at a.cpp:11:70
8 public:
9 void operator delete (void * ptr)
10 {
-> 11 if (ptr != nullptr) static_cast<IDestroyable
*>(ptr)->Destroy();
12 }
13 };
14
