From: Vincent Pit <vince@profvince.com>
Date: Fri, 27 Mar 2015 18:47:42 +0000 (-0300)
Subject: Preserve PL_scopestack[cx->blk_oldscopesp - 1] in su_pop()
X-Git-Tag: v0.27~4
X-Git-Url: http://git.vpit.fr/?p=perl%2Fmodules%2FScope-Upper.git;a=commitdiff_plain;h=97dc8ef80311dba0ff5058c2ee54caa8193b5c51;hp=97dc8ef80311dba0ff5058c2ee54caa8193b5c51

Preserve PL_scopestack[cx->blk_oldscopesp - 1] in su_pop()

Starting from perl 5.19.4 commit 2537512, pp_leavesub does a second
leave_scope(PL_scopestack[cx->blk_oldscopesp - 1]) just after the usual
LEAVE call. However, this index in the scope stack may be overwritten
by our own "flush" leave_scope() call in su_pop(). More precisely, this
seems to happen in sv_clear() (called from sv_free2() called from
sv_unref_flags() called from sv_force_normal_flags() called from
leave_scope()) and only when the debugger is enabled.
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