STRLEN old_delta;
U8 *p;
#ifdef DEBUGGING
- const U8 *real_start;
+ const U8 *evacp;
+ STRLEN evacn;
#endif
STRLEN max_delta;
/* Nothing to do. */
return;
}
- /* SvPVX(sv) may move in SV_CHECK_THINKFIRST(sv), but after this line,
- nothing uses the value of ptr any more. */
max_delta = SvLEN(sv) ? SvLEN(sv) : SvCUR(sv);
- if (ptr <= SvPVX_const(sv))
+ if (delta > max_delta)
Perl_croak(aTHX_ "panic: sv_chop ptr=%p, start=%p, end=%p",
ptr, SvPVX_const(sv), SvPVX_const(sv) + max_delta);
+ /* SvPVX(sv) may move in SV_CHECK_THINKFIRST(sv), so don't use ptr any more */
SV_CHECK_THINKFIRST(sv);
- if (delta > max_delta)
- Perl_croak(aTHX_ "panic: sv_chop ptr=%p (was %p), start=%p, end=%p",
- SvPVX_const(sv) + delta, ptr, SvPVX_const(sv),
- SvPVX_const(sv) + max_delta);
if (!SvOOK(sv)) {
if (!SvLEN(sv)) { /* make copy of shared string */
p = (U8 *)SvPVX_const(sv);
- delta += old_delta;
-
#ifdef DEBUGGING
- real_start = p - delta;
+ /* how many bytes were evacuated? we will fill them with sentinel
+ bytes, except for the part holding the new offset of course. */
+ evacn = delta;
+ if (old_delta)
+ evacn += (old_delta < 0x100 ? 1 : 1 + sizeof(STRLEN));
+ assert(evacn);
+ assert(evacn <= delta + old_delta);
+ evacp = p - evacn;
#endif
+ delta += old_delta;
assert(delta);
if (delta < 0x100) {
*--p = (U8) delta;
#ifdef DEBUGGING
/* Fill the preceding buffer with sentinals to verify that no-one is
using it. */
- while (p > real_start) {
+ while (p > evacp) {
--p;
*p = (U8)PTR2UV(p);
}