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Postings from April 2008
On Wed, 23 Apr 2008, Andy Dougherty wrote:
> 2. There are some casting and type-punning warnings that have, as their
> ultimate cause, the STACK_DATAP() macro. Getting rid of the
> type-punning warning gives rise to a cast alignment warning.
>
> Looking up a level, the only uses for that macro are to return
> Stack_Entry_t pointers. Why not be explicit about it in the definition
> in include/parrot/stacks.h? The attached patch tries to do just that.
> I haven't tested this, but it looks like it ought to work.
Oops. It won't work because I missed a level of indirection.
> - return STACK_DATAP(new_chunk);
That used to return &(new_chunk->u.data)
> + return new_chunk->u.stdata;
And this returns new_chunk->u.stdata instead.
Oops. I can only say I was fooled by the function signatures that these
functions returned 'void *', when they actually return 'void **'.
I'll try to fix that. I apologize in advance if I wasted anyone's time
trying this out. (I still think my basic premise is right -- we can avoid
pointer cast warnings and problems if we declare more explicitly what we
wish to do.)
--
Andy Dougherty doughera@lafayette.edu
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