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Интерактивная система просмотра системных руководств (man-ов)

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O (3)
  • >> O (3) ( Solaris man: Библиотечные вызовы )
  • O (3) ( Разные man: Библиотечные вызовы )


         O - Generic interface to Perl Compiler backends


                 perl -MO=Backend[,OPTIONS]


         This is the module that is used as a frontend to the Perl


         Most compiler backends use the following conventions:
         OPTIONS consists of a comma-separated list of words (no
         white-space).  The `-v' option usually puts the backend into
         verbose mode.  The `-ofile' option generates output to file
         instead of stdout. The `-D' option followed by various
         letters turns on various internal debugging flags. See the
         documentation for the desired backend (named `B::Backend'
         for the example above) to find out about that backend.


         This section is only necessary for those who want to write a
         compiler backend module that can be used via this module.
         The command-line mentioned in the SYNOPSIS section
         corresponds to the Perl code
             use O ("Backend", OPTIONS);
         The `import' function which that calls loads in the
         appropriate `B::Backend' module and calls the `compile'
         function in that package, passing it OPTIONS. That function
         is expected to return a sub reference which we'll call
         CALLBACK. Next, the "compile-only" flag is switched on
         (equivalent to the command-line option `-c') and a CHECK
         block is registered which calls CALLBACK. Thus the main Perl
         program mentioned on the command-line is read in, parsed and
         compiled into internal syntax tree form. Since the `-c' flag
         is set, the program does not start running (excepting BEGIN
         blocks of course) but the CALLBACK function registered by
         the compiler backend is called.
         In summary, a compiler backend module should be called
         "B::Foo" for some foo and live in the appropriate directory
         for that name.  It should define a function called
         `compile'. When the user types
             perl -MO=Foo,OPTIONS
         that function is called and is passed those OPTIONS (split
         on commas). It should return a sub ref to the main
         compilation function.  After the user's program is loaded
         and parsed, that returned sub ref is invoked which can then
         go ahead and do the compilation, usually by making use of
         the `B' module's functionality.


         Malcolm Beattie, `'

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