[Tremor] Segfault problems with tremor

[Segher Boessenkool]

> int vorbis_block_init(vorbis_dsp_state *v, vorbis_block *vb){
>   memset(vb,0,sizeof(*vb));
>   vb->vd=v;
>   vb->localalloc=0;
>   vb->localstore=NULL;
>
>   return(0);
> }
>
> Specifically,   the memset(vb,0,sizeof(*vb));
> This is NOT wiping the supplied vorbis_block structure; it is only 
> wiping the
> first 4 bytes of it - the size of a pointer on the PPC - so the "struct
> alloc_chain*" pointer, "reap"  is pointing at some random value, as 
> well as
> most of the rest of the structure.

sizeof*vb == sizeof(vorbis_block) != 4 so this is not a problem in the 
code.
GCC (any version, but certainly something as old as 3.3) has no problem 
with
this either, as far as I know.  Maybe GCC doesn't inline it and uclibc 
has
a bug, although I'd doubt that as well.

Can you show generated assembler code for this, or something else 
(debugger
output or such) to show the problem happening?


Segher