B::Bytecode - Perl compiler's bytecode backend
perl -MO=Bytecode[,-H][,-oscript.plc] script.pl
Compiles a Perl script into a bytecode format that could be loaded later by the ByteLoader module and executed as a regular Perl script. This saves time for the optree parsing and compilation and space for the sourcecode in memory.
$ perl -MO=Bytecode,-H,-ohi -e 'print "hi!\n"' $ perl hi hi!
Prepend a use ByteLoader VERSION; line to the produced bytecode.
use ByteLoader VERSION;
Save all the BEGIN blocks. Normally only BEGIN blocks that require other files (ex. use Foo;) are saved.
require
use Foo;
Keep the syntax tree - it is stripped by default.
Put the bytecode in <outfile> instead of dumping it to STDOUT.
Scan the script for # line .. directives and for <goto LABEL> expressions. When gotos are found keep the syntax tree.
# line ..
Output assembler source rather than piping it through the assembler and outputting bytecode. Without -q the assembler source is commented.
use package. Might be needed of the package is not automatically detected.
Be quiet.
Be verbose.
Restore @INC for running within the CORE testsuite.
Set the COP file - for running within the CORE testsuite.
OPs, prints each OP as it's processed
Set debugging flag for more verbose STDERR output. Verbose debugging options are crucial, because we have no interactive debugger at the early CHECK step, where the compilation happens.
M for Magic and Matches.
Debug GV's
Set developer Assertions, to help find possible obj-indices out of range.
5.10 threaded fails with setting the wrong MATCH op_pmflags 5.10 non-threaded fails calling anoncode, ...
BEGIN { goto A: while 1; A: } won't even compile.
BEGIN { goto A: while 1; A: }
?...? and reset do not work as expected.
?...?
reset
variables in (?{ ... }) constructs are not properly scoped.
(?{ ... })
Scripts that use source filters will fail miserably.
Special GV's fail.
There are also undocumented bugs and options.
THIS CODE IS HIGHLY EXPERIMENTAL. USE AT YOUR OWN RISK.
Originally written by Malcolm Beattie <mbeattie@sable.ox.ac.uk> and modified by Benjamin Stuhl <sho_pi@hotmail.com>.
Rewritten by Enache Adrian <enache@rdslink.ro>, 2003 a.d.
Enhanced by Reini Urban <rurban@cpan.org>, 2008, 2009
To install B::C, copy and paste the appropriate command in to your terminal.
cpanm
cpanm B::C
CPAN shell
perl -MCPAN -e shell install B::C
For more information on module installation, please visit the detailed CPAN module installation guide.