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sysdep/i386/backtrace.h infinite loop?

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...


thanks
Marco

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