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From 40258daf9899686d934c460ba3630431312d7694 Mon Sep 17 00:00:00 2001
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From: Tony Cook <tony@develop-help.com>
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Date: Wed, 15 May 2019 15:59:49 +1000
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Subject: [PATCH] (perl #134072) allow \&foo = \&bar to work in main::
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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subs in main:: are stored as a RV referring to a CV as a space
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optimization, but the pp_refassign code expected to find a glob,
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which made the assignment a no-op.
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Fix this by upgrading the reference to a glob in the refassign check
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function.
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Note that this would be an issue in other packages if 1e2cfe157ca
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was reverted (allowing the space savings in other packages too.)
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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---
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op.c | 9 +++++++++
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t/op/lvref.t | 15 ++++++++++++++-
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2 files changed, 23 insertions(+), 1 deletion(-)
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diff --git a/op.c b/op.c
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index f63eeadc36..6ad192307f 100644
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--- a/op.c
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+++ b/op.c
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@@ -12462,7 +12462,16 @@ Perl_ck_refassign(pTHX_ OP *o)
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OP * const kid = cUNOPx(kidparent)->op_first;
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o->op_private |= OPpLVREF_CV;
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if (kid->op_type == OP_GV) {
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+ SV *sv = (SV*)cGVOPx_gv(kid);
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varop = kidparent;
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+ if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVCV) {
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+ /* a CVREF here confuses pp_refassign, so make sure
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+ it gets a GV */
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+ CV *const cv = (CV*)SvRV(sv);
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+ SV *name_sv = sv_2mortal(newSVhek(CvNAME_HEK(cv)));
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+ (void)gv_init_sv((GV*)sv, CvSTASH(cv), name_sv, 0);
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+ assert(SvTYPE(sv) == SVt_PVGV);
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+ }
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goto detach_and_stack;
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}
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if (kid->op_type != OP_PADCV) goto bad;
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diff --git a/t/op/lvref.t b/t/op/lvref.t
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index 3d5e952fb0..3991a53780 100644
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--- a/t/op/lvref.t
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+++ b/t/op/lvref.t
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@@ -1,10 +1,11 @@
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+#!perl
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BEGIN {
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chdir 't';
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require './test.pl';
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set_up_inc("../lib");
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}
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-plan 164;
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+plan 167;
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eval '\$x = \$y';
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like $@, qr/^Experimental aliasing via reference not enabled/,
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@@ -291,6 +292,18 @@ package CodeTest {
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my sub bs;
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\(&cs) = expect_list_cx;
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is \&cs, \&ThatSub, '\(&statesub)';
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+
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+ package main {
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+ # this is only a problem in main:: due to 1e2cfe157ca
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+ sub sx { "x" }
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+ sub sy { "y" }
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+ is sx(), "x", "check original";
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+ my $temp = \&sx;
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+ \&sx = \&sy;
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+ is sx(), "y", "aliased";
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+ \&sx = $temp;
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+ is sx(), "x", "and restored";
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+ }
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}
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# Mixed List Assignments
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--
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2.20.1
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