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Manual Reference Pages  -  VRENAME (1)

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vrename - change signal names across many Verilog files



  vrename <filename_or_directory>...


Vrename will allow a signal to be changed across all levels of the design hierarchy, or to create a cross reference of signal names. (It actually includes module names, macros, and other definitions, so those can be changed too.)

Vpm uses a three step process. First, use

    vrename --list  [<file.v>...]  [<directory>....]

This reads the specified files, or all files below the specified directory, and creates a signals.vrename file.

Now, edit the signals.vrename file manually to specify the new signal names. Then, use

    vrename --change [<file.v>...]  [<directory>....]


vrename takes the following arguments:
--help Displays this message and program version and exits.
--version Displays program version and exits.
--change Take the signals file signals.vrename in the current directory and change the signals in the design as specified by the signals file. Either --list or --change must be specified.
--changefile {file} Use the given filename instead of signals.vrename.
--changelang Include in the signals.vrename file the template needed to change the language standard for the file. For the first run, use --list --changelang and --language to specify the file’s original language, then rerun with the --change option. The files will get escaped identifiers for the most recent Verilog standard. For example with --language 1364-2005, do will become \do .
--crypt With --list, randomize the signal renames. With --change, compress spaces and comments and apply those renames listed in the file (presumably created with vrename --list --crypt).

The comment /*ENCRYPT_ME*/ must be included in all files that need to be encrypted, or use the --cryptall flag. If a signal should not be encrypted, it can simply be set in the signals.vrename list to be changed to itself. After encrypting, you may want to save the signals.vrename file so you have a key for decoding, and also so that it may be used for the next encryption run. When used in this way for the next encryption run, only new signals will get new encryptions, all other encryptions will be encrypted the same.

--cryptall As with --crypt, but put cryptic names into signals.vrename even if the file does not include ENCRYPT_ME. Generally you will then need to edit the signals.vrename file manually to exclude any top level signals that should be preserved.
--keywords Include keywords in the renaming list. Default is to ignore keywords, as changing a keyword will probably result in unrunnable code, however, occasionally it may be necessary to rename signals which happen to match the name of keywords recently added to the language (such as ’bit’).
--language <1364-1995|1364-2001|1364-2005|1800-2005|1800-2009|1800-2012> Set the language standard for the files. This determines which tokens are signals versus keywords, such as the ever-common do (data-out signal, versus a do-while loop keyword).
--list Create a list of signals in the design and write to signals.vrename. Either --list or --change must be specified.
--nowrite Don’t write the actual changes, just report the files that would be changed.
--o {dir} Use the given directory for output instead of the current directory.
--read Read the changes list, allows --list to append to the changes already read.
--xref Include a cross reference of where the signals are used. --list must also be specified.


Verilog-Perl is part of the <> free Verilog EDA software tool suite. The latest version is available from CPAN and from <>.

Copyright 2000-2016 by Wilson Snyder. This package is free software; you can redistribute it and/or modify it under the terms of either the GNU Lesser General Public License Version 3 or the Perl Artistic License Version 2.0.


Wilson Snyder <>


Verilog-Perl, Verilog::Parser
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