[Issue 8923] Destructors of struct members get called at the wrong point

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8923


Maxim Fomin <maxim at maxim-fomin.ru> changed:

           What    |Removed                     |Added
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                 CC|                            |maxim at maxim-fomin.ru


--- Comment #1 from Maxim Fomin <maxim at maxim-fomin.ru> 2012-10-31 11:51:58 PDT ---
It seems that dmd doesn't pass allocated value correctly. In this case it emits
in main function code:

callq  <_d_allocmemory>
movq   $0x0,(%rax)
movb   $0x0,0x8(%rax)
lea    -0x8(%rbp),%rax
xor    %rcx,%rcx
mov    %rcx,(%rax)
mov    %rax,%rdi

So, allocated value is overwritten and destructor gets incorrect pointer in
%rdi. However, if the case is simplified to one level (replace S s; with
DestructorCounter s;) dmd emits correct code:

callq  <_d_allocmemory>
movq   $0x0,(%rax)
movb   $0x0,0x8(%rax)
mov    %rax,-0x8(%rbp)
lea    -0x8(%rbp),%rax
xor    %rcx,%rcx
mov    %rax,%rdi

Now %rdi points to allocated memory. Probably, because S field destructor
doesn't access destructorCalled object forces dmd to pass invalid value.

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