in reply to Inline - Subroutine Overhead

Is there any way in PERL to resolve the above issue

You could always transfer the problem from runtime to compile time by using a source filter to provide an inline/macro facility. In use it would look something like this:

#! perl -slw use strict; use Macro; MACRO sub fred { my( $a, $b, $c ) = @_; return ( $a + $b ) * $c; } ENDMACRO my( $x, $y, $z ) = ( 1, 4, 7 ); print fred( $x, $y, $z ); for my $x ( 1 .. 10 ) { print fred( $x, $y, $z ); } __END__ P:\test>435608 35 35 42 49 56 63 70 77 84 91 98

And the actual code (whitespace reduced) that would be executed is:

my( $x, $y, $z ) = ( 1, 4, 7 ); print do{ our $MACRO_RETURN; local $MACRO_RETURN; $MACRO_RETURN = ( $x + $y ) * $z; goto MACRO_RETURN;; MACRO_RETURN: $MACRO_RETURN }; for my $x ( 1 .. 10 ) { print do{ our $MACRO_RETURN; local $MACRO_RETURN; $MACRO_RETURN = ( $x + $y ) * $z; goto MACRO_RETURN;; MACRO_RETURN: $MACRO_RETURN }; }

This is only a demonstration (with flaws) of the possibilities, and far from fully thought through, but it has some merits relative to the alternatives offered:

The package Macro:

package Macro; use strict; use warnings; use Filter::Simple; my %macros; FILTER_ONLY executable => sub { while( s[ MACRO\s+ sub\s+ (\w+)\s+ \{\s+ my\s*\( \s* ( [^\)]+? ) \s* \)\s* =\s* \@_;\s+ ( .*? ) \} \s* ENDMACRO ][]xsmg ) { my( $name, $args, $body ) = ( $1, $2, $3 ); $body =~ s[[\r\n]+][]g; $macros{ $name } = [ [ split ',\s*', $args ], "do{ our \$MACRO_RETURN; local \$MACRO_RETURN; $body; MACRO_RETURN: \$MACRO_RETURN }" ]; } for my $macro ( keys %macros ) { s[ $macro\( \s* ( [^\)]+ ) \s* \) ]{ my @actual = split '\s*,\s*', $1; my @formal = @{ $macros{ $macro }[ 0 ] }; my $do = $macros{ $macro }[ 1 ]; my %substs; @substs{ @formal } = @actual; $do =~ s[([\$][\w]+)]{ exists $substs{ $1 } ? $substs{ $1 } : $1 }eg; $do =~ s[return\s*(.*?)\s*;] [\$MACRO_RETURN = $1; goto MACRO_RETURN;]g; $do; }xeg; } $_; }; 1;

Source filters are either condemned as evil, hailed as saviours, or sometimes both as people transition from one state of Perlish grace to another.


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