Branch: refs/heads/davem/line
Home: https://github.com/Perl/perl5
Commit: 193e8180e5b95830b28369f5dfd1fdfffddaae79
https://github.com/Perl/perl5/commit/193e8180e5b95830b28369f5dfd1fdfffddaae79
Author: David Mitchell <da...@iabyn.com>
Date: 2024-02-22 (Thu, 22 Feb 2024)
Changed paths:
M Porting/deparse-skips.txt
M lib/B/Deparse.pm
M lib/B/Deparse.t
M lib/B/Op_private.pm
M opcode.h
M regen/op_private
M toke.c
Log Message:
-----------
add OPpCONST_TOKEN_* flags to aid deparsing
Code like
my $line = __LINE__;
my $file = __FILE__;
my $pkg = __PACKAGE__;
was being deparsed as
my $line = '42';
my $file = 'foo.pl';
my $pkg = 'Foo::Bar';
because __LINE__ etc are converted by the lexer into an ordinary
OP_CONST, whose SV is just a plain string holding the line number or
whatever.
This commit uses two spare bits in op_private on OP_CONST ops to create
a 4-valued bit field, indicating whether the op is a normal constant or
one of those three special constant tokens. This field is then used
by Deparse to output a literal "__LINE__" or whatever rather than the
value of the constant.
This fixes one failing test file under
cd t; ./TEST -deparse
and removes one (but not all) sources of failure from three others.
Note that __SUB__ is already special-cased to deparse literally
(except when used outside a sub where it deparses as 'undef'), while
the special tokens __DATA__, __END__ and __CLASS__ don't generate
OP_CONSTs.
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