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Bytecode (3)
  • >> Bytecode (3) ( Solaris man: Библиотечные вызовы )
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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, [email protected]
    
    
    
    


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