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From 390fe0c0d09aadc66f644e9eee4aa1245221188c Mon Sep 17 00:00:00 2001
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From: David Mitchell <davem@iabyn.com>
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Date: Tue, 25 Aug 2020 13:15:25 +0100
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Subject: [PATCH] sort { return foo() } ...
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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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GH #18081
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A sub call via return in a sort block was called in void rather than
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scalar context, causing the comparison result to be discarded.
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This because when a sort block is called it is not a real function
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call, even though a sort block can be returned from. Instead, a
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CXt_NULL is pushed on the context stack. Because this isn't a sub-ish
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context type (unlike CXt_SUB, CXt_EVAL etc) there is no 'caller sub'
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on the context stack to be found to retrieve the caller's context
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(i.e. cx->cx_gimme).
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This commit fixes it by special-casing Perl_gimme_V().
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Ideally at some future point, a new context type, CXt_SORT, should be
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added. This would be used instead of CXt_NULL when a sort BLOCK is
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called. Like other sub-ish context types, it would have an old_cxsubix
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field and PL_curstackinfo->si_cxsubix would point to it. This would
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eliminate needing special-case handling in places like Perl_gimme_V().
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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---
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inline.h | 2 +-
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t/op/sort.t | 12 +++++++++++-
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2 files changed, 12 insertions(+), 2 deletions(-)
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diff --git a/inline.h b/inline.h
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index a8240efb9c..6fbd5abfea 100644
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--- a/inline.h
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+++ b/inline.h
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@@ -2086,7 +2086,7 @@ Perl_gimme_V(pTHX)
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return gimme;
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cxix = PL_curstackinfo->si_cxsubix;
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if (cxix < 0)
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- return G_VOID;
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+ return PL_curstackinfo->si_type == PERLSI_SORT ? G_SCALAR: G_VOID;
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assert(cxstack[cxix].blk_gimme & G_WANT);
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return (cxstack[cxix].blk_gimme & G_WANT);
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}
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diff --git a/t/op/sort.t b/t/op/sort.t
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index f2e139dff0..8e387fb90d 100644
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--- a/t/op/sort.t
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+++ b/t/op/sort.t
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@@ -7,7 +7,7 @@ BEGIN {
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set_up_inc('../lib');
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}
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use warnings;
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-plan(tests => 203);
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+plan(tests => 204);
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use Tie::Array; # we need to test sorting tied arrays
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# these shouldn't hang
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@@ -1202,3 +1202,13 @@ SKIP:
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$fillb = undef;
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is $act, "01[sortb]2[fillb]";
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}
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+
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+# GH #18081
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+# sub call via return in sort block was called in void rather than scalar
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+# context
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+
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+{
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+ sub sort18081 { $a + 1 <=> $b + 1 }
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+ my @a = sort { return &sort18081 } 6,1,2;
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+ is "@a", "1 2 6", "GH #18081";
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+}
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--
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2.25.4
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