Branch: refs/heads/blead
Home: https://github.com/Perl/perl5
Commit: 6edc33d41c241e28440f8fea3d8f1c8ea5d95a56
https://github.com/Perl/perl5/commit/6edc33d41c241e28440f8fea3d8f1c8ea5d95a56
Author: TAKAI Kousuke <62541129+t-...@users.noreply.github.com>
Date: 2025-07-15 (Tue, 15 Jul 2025)
Changed paths:
M pod/perldelta.pod
M pp.c
M pp_hot.c
M t/lib/warnings/9uninit
Log Message:
-----------
pp.c, pp_hot.c: Reorder SvXV_nomg() to fetch operands in left-to-right order
Some binary (2-operand) operators, notably arithmetic add (+) and
subtract (-), used to fetch its RHS operand first then LHS one,
so they would issue "use of uninitialized value" warnings in
right-to-left order:
% perl -wle 'print $a + $b'
Use of uninitialized value $b in addition (+) at -e line 1.
Use of uninitialized value $a in addition (+) at -e line 1.
0
%
I think this is not intuitive for users, as "perlop" says that
"Perl has a general rule that the operands of an operator are evaluated
in left-to-right order." (3-operand case is more surprising;
"print $a + $b + $c" will warn in the order $b, $a, $c.)
This change reverses the operand fetch order in these operators
to issue warnings in left-to-right order.
t/lib/warnings/9uninit: Reorder expected warnings in left-to-right order.
pod/perldelta.pod: Add perldelta entry for this change.
Commit: dbbbb38f2754860677e5d42b5625b56785dccd23
https://github.com/Perl/perl5/commit/dbbbb38f2754860677e5d42b5625b56785dccd23
Author: TAKAI Kousuke <62541129+t-...@users.noreply.github.com>
Date: 2025-07-15 (Tue, 15 Jul 2025)
Changed paths:
M pp.c
M pp_hot.c
Log Message:
-----------
pp_add, pp_subtract: Unify TARGn(<result>, 1) calls into a single call
Before this change, pp_add() and pp_subtract() had two (or three
before the previous commit) calls of TARGn(<result>, 1) for each.
Consolidating these calls into single call will (slightly) reduce
the size of the compiled code.
Commit: e78ee042624f37795abc6d43d9a40b5e2a0f9172
https://github.com/Perl/perl5/commit/e78ee042624f37795abc6d43d9a40b5e2a0f9172
Author: TAKAI Kousuke <62541129+t-...@users.noreply.github.com>
Date: 2025-07-15 (Tue, 15 Jul 2025)
Changed paths:
M pod/perldelta.pod
Log Message:
-----------
perldelta.pod: describe the bug where "0+" methods were sometimes called in
reverse order
The previous commit "pp.c, pp_hot.c: Reorder SvXV_nomg() to fetch operands
in left-to-right order" will not only change the order of "Use of
uninialized value" warnings, but actually also change the order of
the call of "0+" overloading methods for each operands.
Compare: https://github.com/Perl/perl5/compare/d349122ed895...e78ee042624f
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