pp_goto: Call get-magic before choosing goto type

Deciding whether this is goto-label or goto-sub can only correctly
happen after get-magic has been invoked, as get-magic can cause the
argument to begin or cease to be a subroutine reference.

diff --git a/pp_ctl.c b/pp_ctl.c
index f889ca8..0256070 100644 (file)
--- a/pp_ctl.c
+++ b/pp_ctl.c
@@ -2768,6 +2768,7 @@ PP(pp_goto)
 
     if (PL_op->op_flags & OPf_STACKED) {
        SV * const sv = POPs;
+       SvGETMAGIC(sv);
 
        /* This egregious kludge implements goto &subroutine */
        if (SvROK(sv) && SvTYPE(SvRV(sv)) == SVt_PVCV) {
@@ -2951,7 +2952,7 @@ PP(pp_goto)
            }
        }
        else {
-           label       = SvPV_const(sv, label_len);
+           label       = SvPV_nomg_const(sv, label_len);
             label_flags = SvUTF8(sv);
        }
     }

diff --git a/t/op/goto.t b/t/op/goto.t
index 7dafb2a..486277d 100644 (file)
--- a/t/op/goto.t
+++ b/t/op/goto.t
@@ -10,7 +10,7 @@ BEGIN {
 
 use warnings;
 use strict;
-plan tests => 88;
+plan tests => 89;
 our $TODO;
 
 my $deprecated = 0;
@@ -663,3 +663,9 @@ eval { my $x = "\0"; goto $x };
 like $@, qr/^Can't find label \0 at /, 'goto $x where $x begins with \0';
 eval { goto "\0" };
 like $@, qr/^Can't find label \0 at /, 'goto "\0"';
+
+sub TIESCALAR { bless [pop] }
+sub FETCH     { $_[0][0] }
+tie my $t, "", sub { "cluck up porridge" };
+is eval { sub { goto $t }->() }//$@, 'cluck up porridge',
+  'tied arg returning sub ref';