Re: [sv-ec] Re: [sv-bc] potential command line option

From: Steven Sharp (sharp@cadence.com)
Date: Sat Apr 23 2005 - 16:53:14 PDT

  • Next message: Randy Misustin: "Re: [sv-ec] Re: [sv-bc] potential command line option"

    Gord wrote:
    >
    >How about adding:
    > 'configs_with_source
    > 'configs_with_source none
    >or something similar?
    >
    >This would restrict the keyword pollution to domains in which
    >users may want to have configs and source in the same file.

    I was starting to think of something along the same lines, but
    building on the `begin_keywords directive already added to P1800
    (which is also now proposed for 1364).

    We have been considering support for some non-standard arguments
    for this directive, to support Verilog-AMS. This could be a simple
    value to indicate Verilog-AMS, such as

      `begin_keywords "Verilog-AMS"
      
    Or it could allow independent control of which Verilog base standard
    to use along with the extra AMS keywords, such as

      `begin_keywords "1364-1995+ams"
      `begin_keywords "1364-2001+ams"
      `begin_keywords "1364-2005+ams"
      `begin_keywords "1800-2005+ams"

    (We felt that using -ams as an extension made it unclear whether that
    added or subtracted the AMS keywords.)
      
    In a similar style to the latter, you could use

      `begin_keywords "1364-2001+config"
      `begin_keywords "1364-2005+config"
      `begin_keywords "1800-2005+config"

    If you wanted to allow the full set of library map file keywords,
    +libmap would probably be more appropriate. I am not clear whether
    ModelSim has been allowing the full library map syntax in source files
    or just configs.

    Note that this does not even require directives to be used in source
    files if the files match the default starting keyword set for the tool
    (which may be controllable by command line options).

    This could be defined as a standardized argument for `begin_keywords,
    which could be required or optional for tools to support, or left to
    ModelSim to define as a non-standard argument value. Independent of
    this, we would have to define the default keyword set for "1364-2001"
    and whether it includes the config keywords (note that this does not
    have to match the official interpretation of whether the keywords are
    actually reserved in 1364-2001).

    I do think that using "+config" to add the keywords is clearer than any
    syntax to try to subtract them if they are normally included. Another
    shorter syntax might be "1364-2001c".

    Steven Sharp
    sharp@cadence.com

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