From 27153ab81cea9d5ca3a79ea8e528eb90fed9fddb Mon Sep 17 00:00:00 2001
From: Jarkko Hietaniemi <jhi@iki.fi>
Date: Wed, 5 Dec 2001 17:07:00 +0000
Subject: [PATCH] (retracted by #13476)

Manually apply #13474; fixes stale reference to dead
CvOUTSIDE(); this can happen when anonymous subroutines
that aren't closures are returned from an eval""

(threads/shared/sv_refs.t is coredump-unhappy about this change)

p4raw-id: //depot/perl@13475
---
 op.c              | 42 +++++++++++++++++++++++++++++++++++++-----
 t/run/kill_perl.t | 10 ++++++++++
 2 files changed, 47 insertions(+), 5 deletions(-)

diff --git a/op.c b/op.c
index 8125b30..19bfe2a 100644
--- a/op.c
+++ b/op.c
@@ -4216,6 +4216,9 @@ Perl_newLOOPEX(pTHX_ I32 type, OP *label)
 void
 Perl_cv_undef(pTHX_ CV *cv)
 {
+    CV *outsidecv;
+    CV *freecv = Nullcv;
+
 #ifdef USE_5005THREADS
     if (CvMUTEXP(cv)) {
 	MUTEX_DESTROY(CvMUTEXP(cv));
@@ -4251,13 +4254,14 @@ Perl_cv_undef(pTHX_ CV *cv)
     }
     SvPOK_off((SV*)cv);		/* forget prototype */
     CvGV(cv) = Nullgv;
+    outsidecv = CvOUTSIDE(cv);
     /* Since closure prototypes have the same lifetime as the containing
      * CV, they don't hold a refcount on the outside CV.  This avoids
      * the refcount loop between the outer CV (which keeps a refcount to
      * the closure prototype in the pad entry for pp_anoncode()) and the
      * closure prototype, and the ensuing memory leak.  --GSAR */
     if (!CvANON(cv) || CvCLONED(cv))
-	SvREFCNT_dec(CvOUTSIDE(cv));
+	freecv = outsidecv;
     CvOUTSIDE(cv) = Nullcv;
     if (CvCONST(cv)) {
 	SvREFCNT_dec((SV*)CvXSUBANY(cv).any_ptr);
@@ -4266,10 +4270,36 @@ Perl_cv_undef(pTHX_ CV *cv)
     if (CvPADLIST(cv)) {
 	/* may be during global destruction */
 	if (SvREFCNT(CvPADLIST(cv))) {
-	    I32 i = AvFILLp(CvPADLIST(cv));
-	    while (i >= 0) {
-		SV** svp = av_fetch(CvPADLIST(cv), i--, FALSE);
-		SV* sv = svp ? *svp : Nullsv;
+	    /* inner references to cv must be fixed up */
+	    AV *padlist = CvPADLIST(cv);
+	    AV *comppad_name = (AV*)AvARRAY(padlist)[0];
+	    AV *comppad = (AV*)AvARRAY(padlist)[1];
+	    SV **namepad = AvARRAY(comppad_name);
+	    SV **curpad = AvARRAY(comppad);
+	    I32 ix;
+	    for (ix = AvFILLp(comppad_name); ix > 0; ix--) {
+		SV *namesv = namepad[ix];
+		if (namesv && namesv != &PL_sv_undef
+		    && *SvPVX(namesv) == '&')
+		{
+		    CV *innercv = (CV*)curpad[ix];
+		    if (SvTYPE(innercv) == SVt_PVCV
+			&& CvOUTSIDE(innercv) == cv)
+		    {
+			CvOUTSIDE(innercv) = outsidecv;
+			if (!CvANON(innercv) || CvCLONED(innercv)) {
+			    (void)SvREFCNT_inc(outsidecv);
+			    if (SvREFCNT(cv))
+				SvREFCNT_dec(cv);
+			}
+		    }
+		}
+	    }
+	    if (freecv)
+		SvREFCNT_dec(freecv);
+	    ix = AvFILLp(padlist);
+	    while (ix >= 0) {
+		SV* sv = AvARRAY(padlist)[ix--];
 		if (!sv)
 		    continue;
 		if (sv == (SV*)PL_comppad_name)
@@ -4284,6 +4314,8 @@ Perl_cv_undef(pTHX_ CV *cv)
 	}
 	CvPADLIST(cv) = Nullav;
     }
+    else if (freecv)
+	SvREFCNT_dec(freecv);
     if (CvXSUB(cv)) {
         CvXSUB(cv) = 0;
     }
diff --git a/t/run/kill_perl.t b/t/run/kill_perl.t
index 6345a79..09e7d9c 100644
--- a/t/run/kill_perl.t
+++ b/t/run/kill_perl.t
@@ -629,6 +629,16 @@ EOT
 EXPECT
 ok
 ########
+# test that closures generated by eval"" hold on to the CV of the eval""
+# for their entire lifetime
+$code = eval q[
+  sub { eval '$x = "ok 1\n"'; }
+];
+&{$code}();
+print $x;
+EXPECT
+ok 1
+########
 # This test is here instead of pragma/locale.t because
 # the bug depends on in the internal state of the locale
 # settings and pragma/locale messes up that state pretty badly.
-- 
2.7.4