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NAME

     B::Bytecode - Perl compiler's bytecode backend



SYNOPSIS
             perl -MO=Bytecode[,OPTIONS] foo.pl




DESCRIPTION
     This compiler backend takes Perl source and generates a
     platform-independent bytecode encapsulating code to load the
     internal structures perl uses to run your program. When the
     generated bytecode is loaded in, your program is ready to
     run, reducing the time which perl would have taken to load
     and parse your program into its internal semi-compiled form.
     That means that compiling with this backend will not help
     improve the runtime execution speed of your program but may
     improve the start-up time.  Depending on the environment in
     which your program runs this may or may not be a help.

     The resulting bytecode can be run with a special byteperl
     executable or (for non-main programs) be loaded via the
     byteload_fh function in the B module.



OPTIONS
     If there are any non-option arguments, they are taken to be
     names of objects to be saved (probably doesn't work properly
     yet).  Without extra arguments, it saves the main program.

     -ofilename
         Output to filename instead of STDOUT.

     --  Force end of options.

     -f  Force optimisations on or off one at a time. Each can be
         preceded by no- to turn the option off (e.g. -fno-
         compress-nullops).

     -fcompress-nullops
         Only fills in the necessary fields of ops which have
         been optimised away by perl's internal compiler.

     -fomit-sequence-numbers
         Leaves out code to fill in the op_seq field of all ops
         which is only used by perl's internal compiler.

     -fbypass-nullops
         If op->op_next ever points to a NULLOP, replaces the
         op_next field with the first non-NULLOP in the path of
         execution.

     -fstrip-syntax-tree
         Leaves out code to fill in the pointers which link the
         internal syntax tree together. They're not needed at
         run-time but leaving them out will make it impossible to
         recompile or disassemble the resulting program.  It will
         also stop goto label statements from working.

     -On Optimisation level (n = 0, 1, 2, ...). -O means -O1.
         -O1 sets -fcompress-nullops -fomit-sequence numbers.
         -O6 adds -fstrip-syntax-tree.

     -D  Debug options (concatenated or separate flags like perl
         -D).

     -Do Prints each OP as it's processed.

     -Db Print debugging information about bytecompiler progress.

     -Da Tells the (bytecode) assembler to include source
         assembler lines in its output as bytecode comments.

     -DC Prints each CV taken from the final symbol tree walk.

     -S  Output (bytecode) assembler source rather than piping it
         through the assembler and outputting bytecode.

     -m  Compile as a module rather than a standalone program.
         Currently this just means that the bytecodes for
         initialising main_start, main_root and curpad are
         omitted.



EXAMPLES
             perl -MO=Bytecode,-O6,-o,foo.plc foo.pl

             perl -MO=Bytecode,-S foo.pl > foo.S
             assemble foo.S > foo.plc
             byteperl foo.plc

             perl -MO=Bytecode,-m,-oFoo.pmc Foo.pm




BUGS
     Plenty. Current status: experimental.



AUTHOR
     Malcolm Beattie, mbeattie@sable.ox.ac.uk









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