sysdep/i386/backtrace.h infinite loop?

Wed Feb 21 11:57:00 GMT 2007

Marco Trudel writes:
 > Andrew Haley wrote:
 > > Marco Trudel writes:
 > > > Maybe a stupid question, but how can this loop in 
 > > > sysdep/i386/backtrace.h ever end:
 > > > 
 > > > register _Jv_uintptr_t *_ebp __asm__ ("ebp");
 > > > _Jv_uintptr_t rfp;
 > > > for (rfp = *_ebp; rfp; rfp = *(_Jv_uintptr_t *)rfp)
 > > > {
 > > > // only read access for rfp
 > > > }
 > > > 
 > > > Maybe because "*(_Jv_uintptr_t *)rfp" is changing it, but I can't see how...
 > > 
 > > It looks to me like it's walking down a linked list until it hits NULL.
 > 
 > Yeah, but where happens the down-walking? In my opinion we do 
 > always-the-same-value-walking...
What, in your opinion, does
 rfp = *(_Jv_uintptr_t *)rfp;
do?
Andrew.