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B::Xref(3)             Perl Programmers Reference Guide             B::Xref(3)

       B::Xref - Generates cross reference reports for Perl programs

       perl -MO=Xref[,OPTIONS]

       The B::Xref module is used to generate a cross reference listing of all definitions and uses of variables, sub-
       routines and formats in a Perl program.  It is implemented as a backend for the Perl compiler.

       The report generated is in the following format:

           File filename1
             Subroutine subname1
               Package package1
                 object1        line numbers
                 object2        line numbers
               Package package2

       Each File section reports on a single file. Each Subroutine section reports on a single subroutine apart from
       the special cases "(definitions)" and "(main)". These report, respectively, on subroutine definitions found by
       the initial symbol table walk and on the main part of the program or module external to all subroutines.

       The report is then grouped by the Package of each variable, subroutine or format with the special case "(lexi-
       cals)" meaning lexical variables. Each object name (implicitly qualified by its containing Package) includes
       its type character(s) at the beginning where possible. Lexical variables are easier to track and even included
       dereferencing information where possible.

       The "line numbers" are a comma separated list of line numbers (some preceded by code letters) where that object
       is used in some way.  Simple uses aren't preceded by a code letter. Introductions (such as where a lexical is
       first defined with "my") are indicated with the letter "i". Subroutine and method calls are indicated by the
       character "&".  Subroutine definitions are indicated by "s" and format definitions by "f".

       Option words are separated by commas (not whitespace) and follow the usual conventions of compiler backend

               Directs output to "FILENAME" instead of standard output.

       "-r"    Raw output. Instead of producing a human-readable report, outputs a line in machine-readable form for
               each definition/use of a variable/sub/format.

       "-d"    Don't output the "(definitions)" sections.

               (Internal) debug options, probably only useful if "-r" included.  The "t" option prints the object on
               the top of the stack as it's being tracked. The "O" option prints each operator as it's being processed
               in the execution order of the program.

       Non-lexical variables are quite difficult to track through a program.  Sometimes the type of a non-lexical
       variable's use is impossible to determine. Introductions of non-lexical non-scalars don't seem to be reported

       Malcolm Beattie,

perl v5.8.8                       2001-09-21                        B::Xref(3)