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Author image Wilson Snyder


Verilog::Language - Verilog language utilities


  use Verilog::Language;

  $result = Verilog::Language::is_keyword("wire");  # true
  $result = Verilog::Language::is_compdirect("`notundef");  # false
  $result = Verilog::Language::number_value("4'b111");  # 8
  $result = Verilog::Language::number_bits("32'h1b");  # 32
  $result = Verilog::Language::number_signed("1'sh1");  # 1
  @vec    = Verilog::Language::split_bus("[31,5:4]");  # 31, 5, 4
  @vec    = Verilog::Language::split_bus_nocomma("[31:29]");  # 31, 30, 29
  $result = Verilog::Language::strip_comments("a/*b*/c");  # ac


Verilog::Language provides general utilities for using the Verilog Language, such as parsing numbers or determining what keywords exist. General functions will be added as needed.



Return true if the given symbol string is a Verilog reserved keyword. Value indicates the language standard as per the `begin_keywords macro, '1364-1995', '1364-2001', '1364-2005', '1800-2005', '1800-2009', '1800-2012', '1800-2017' or 'VAMS'.


Return true if the given symbol string is a Verilog compiler directive.


Return true if the given symbol is a built in gate primitive; for example "buf", "xor", etc.


Returns a hash for keywords for given language standard year, where the value of the hash is the standard in which it was defined.


Sets the language standard to indicate what are keywords. If undef, all standards apply. The year is indicates the language standard as per the `begin_keywords macro, '1364-1995', '1364-2001', '1364-2005', '1800-2005' '1800-2009', '1800-2012' or '1800-2017'.


Returns the greatest language currently standardized, presently '1800-2017'.


Return the numeric value of a Verilog value stored as a Math::BigInt, or undef if incorrectly formed. You must 'use Math::BigInt' yourself before calling this function. Note bigints do not have an exact size, so NOT of a Math::BigInt may return a different value than verilog. See also number_value and number_bitvector.


Return the number of bits in a value string, or undef if incorrectly formed, _or_ not specified.


Return the numeric value of a Verilog value stored as a Bit::Vector, or undef if incorrectly formed. You must 'use Bit::Vector' yourself before calling this function. The size of the Vector will be that returned by number_bits.


Return true if the Verilog value is signed, else undef.


Return the numeric value of a Verilog value, or undef if incorrectly formed. It ignores any signed Verilog attributes, but is is returned as a perl signed integer, so it may fail for over 31 bit values. See also number_bigint and number_bitvector.


Return a list of expanded arrays. When passed a string like "foo[5:1:2,10:9]", it will return a array with ("foo[5]", "foo[3]", ...). It correctly handles connectivity expansion also, so that "x[1:0] = y[3:0]" will get intuitive results.


As with split_bus, but faster. Only supports simple decimal colon separated array specifications, such as "foo[3:0]".


Return text with any // or /**/ comments stripped, correctly handing quoted strings. Newlines will be preserved in this process.


Verilog-Perl is part of the https://www.veripool.org/ free Verilog EDA software tool suite. The latest version is available from CPAN and from https://www.veripool.org/verilog-perl.

Copyright 2000-2021 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 <wsnyder@wsnyder.org>


Verilog-Perl, Verilog::EditFiles Verilog::Parser, Verilog::ParseSig, Verilog::Getopt

And the https://www.veripool.org/verilog-modeVerilog-Mode package for Emacs.