[Issue 1687] "extern (C++) interface" and vtbl

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=1687


yebblies <yebblies at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |yebblies at gmail.com


--- Comment #5 from yebblies <yebblies at gmail.com> 2013-11-16 16:42:33 EST ---
I'm pretty sure this bug was fixed by
https://github.com/D-Programming-Language/dmd/pull/2441

https://github.com/D-Programming-Language/dmd/pull/2441/files#diff-51c17721512749ee0a457d576c82eb2eR638

This code
=====================
extern (C++) interface A { void foo(); void bar(); }

void main()
{
    A a;
    a.foo();
}
====================
Generates:

__Dmain PROC NEAR
;  COMDEF __Dmain
        xor     eax, eax              ; 0000 _ 31. C0 // a = null
        mov     ecx, eax              ; 0002 _ 89. C1
        mov     edx, dword ptr [eax]  ; 0004 _ 8B. 10 // edx = a.__vptr[0]
        call    dword ptr [edx]       ; 0006 _ FF. 12 // edx()
        xor     eax, eax              ; 0008 _ 31. C0
        ret                           ; 000A _ C3
__Dmain ENDP


ie foo is called from vtbl index 0

(In reply to comment #4)
> This segfaults:
> 
> extern (C++) interface A { void foo(); void bar(); }
> 
> extern (C++) class B : A { void foo() { } void bar() { } }
> 
> void main()
> {
>     A a = new B;
>     a.foo();
> }
> 
> It actually segfaults even without the interface and the call.

It does?  What platform?  Are you using git head or a release?

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