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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/103303] compiler have trouble to point to the correct
 destructor address while for large align objects with complex inheritance
 while destructing object
Date: Wed, 17 Nov 2021 22:06:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103303

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---

#include <iostream>
#include <cstddef>

struct alignas(16) largeAligned{ // change to 8, no crash
    uint32_t u_arr[128];
};

template<typename Base>
struct ICategory: public virtual Base{
    ICategory(){
        std::cout << __PRETTY_FUNCTION__ << std::endl;
    }
};

struct PureInterfaceHandler{
    virtual ~PureInterfaceHandler() =3D default;
};

template<typename...MsgCategoryNotifierS>
class TemplateNotifier
          : public PureInterfaceHandler,
             public MsgCategoryNotifierS...{
public:
    TemplateNotifier() {
        std::cout << __PRETTY_FUNCTION__  << std::endl;
    }

    virtual ~TemplateNotifier() {
        std::uintptr_t t =3D (std::uintptr_t)this;
        printf("this:%lx\n", (long)(t&0xff));
        printf("this->PureInterfaceHandler:%lx\n",
(long)((std::uintptr_t)(PureInterfaceHandler*)this&0xff));
        (printf("this->%s:%lx\n", typeid
(MsgCategoryNotifierS).name(),(long)((std::uintptr_t)(MsgCategoryNotifierS*=
)this&0xff)),...);
        std::cout << __PRETTY_FUNCTION__  << std::endl;
    }
};


struct Base1{
    Base1(){
        std::cout << __PRETTY_FUNCTION__  << std::endl;
        std::uintptr_t t =3D (std::uintptr_t)&aligned1;
        printf("%lx\n", (long)(t&0xff));
    }
    virtual ~Base1(){
        std::uintptr_t t =3D (std::uintptr_t)&aligned1;
        printf("%lx\n", (long)(t&0xff));
        std::cout << __PRETTY_FUNCTION__  << std::endl;
    }
    largeAligned aligned1;
};


struct Base2{
    Base2(){
        std::cout << __PRETTY_FUNCTION__  << std::endl;
        std::uintptr_t t =3D (std::uintptr_t)&aligned2;
        printf("%lx\n", (long)(t&0xff));
    }
    virtual ~Base2(){
        std::uintptr_t t =3D (std::uintptr_t)&aligned2;
        printf("%lx\n", (long)(t&0xff));
        std::cout << __PRETTY_FUNCTION__  << std::endl;
    }
    largeAligned aligned2;
};

using Category2 =3D ICategory<Base1>;
using Category1 =3D ICategory<Base2>;
struct ProblematicNotifier: TemplateNotifier<Category1, Category2>{};

int main(){
    static_assert(alignof(ProblematicNotifier) =3D=3D 16, "128 is great" );
    static_assert( alignof(std::max_align_t) =3D=3D 16, "16? is great" );
    ProblematicNotifier* objPtr =3D new ProblematicNotifier();
    delete objPtr;
    std::cout << "Done" << std::endl;
}

Looks like there is some wrong alignment information feed to the rest of the
compiler.
this->9ICategoryI5Base2E:b8
this->9ICategoryI5Base1E:c0=