MirOS Manual: B::Xref(3p)


ext::B::B::Xref(3Perl Programmers Reference Guext::B::B::Xref(3p)

NAME

     B::Xref - Generates cross reference reports for Perl pro-
     grams

SYNOPSIS

     perl -MO=Xref[,OPTIONS] foo.pl

DESCRIPTION

     The B::Xref module is used to generate a cross reference
     listing of all definitions and uses of variables, subrou-
     tines 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 spe-
     cial 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 "(lexicals)"
     meaning lexical variables. Each object name (implicitly
     qualified by its containing Package) includes its type
     character(s) at the beginning where possible. Lexical vari-
     ables 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". Sub-
     routine and method calls are indicated by the character "&".
     Subroutine definitions are indicated by "s" and format
     definitions by "f".

OPTIONS

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

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ext::B::B::Xref(3Perl Programmers Reference Guext::B::B::Xref(3p)

     "-oFILENAME"
             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.

     "-D[tO]"
             (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.

BUGS

     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 properly.

AUTHOR

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

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