reportConstantNets.tcl

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###############################################################################
# Copyright (c) 2005-2024 by Altair Engineering, Inc.
# All rights reserved.
#
# Altair Engineering, Inc. makes this software available as part of the Vision
# tool platform.  As long as you are a licensee of the Vision tool platform
# you may make copies of the software and modify it to be used within the
# Vision tool platform, but you must include all of this notice on any copy.
# Redistribution without written permission to any third party, with or
# without modification, is not permitted.
# Altair Engineering, Inc. does not warrant that this software is error free
# or fit for any purpose.  Altair Engineering, Inc. disclaims any liability for
# all claims, expenses, losses, damages and costs any user may incur as a
# result of using, copying or modifying the software.
# =============================================================================
#   @plugin
#       Report Constant Nets
#   @namespace
#       ReportConstantNets
#   @section
#       Analyze the Loaded Database
#   @description
#       Loop over all nets of each module and search for constant values.
#       For the found nets all connected pins are stored in the Mem window.
#   @non-interactive
#   @files
#       reportConstantNets.tcl
#   @example
#       demo/rtl/uar.v
#   @cmdline
#       -verilog @example[0]
#       -userware @files[0]
#   @tag
#       verilog netlist
###############################################################################


# =============================================================================
# Init - Initialize the plugin.
# =============================================================================
#
proc ReportConstantNets:Init {} {
    gui database runOrRegisterChangedCallback ReportConstantNets:Run
}


# =============================================================================
# Finit - Finalize the plugin.
# =============================================================================
#
proc ReportConstantNets:Finit {} {
    gui database removeChangedCallback ReportConstantNets:Run
}


# -----------------------------------------------------------------------------
# _isConstant - Return true if net has a constant value.
#               Optional (by commenting out) power/ground and/or X/Z
#               can be detected too.
# -----------------------------------------------------------------------------
#
proc ReportConstantNets:_isConstant {db net} {
    ##
    # Get value of given net
    #
    set v [$db value $net]

    ##
    # Check for 0/1 values
    #
    if {($v eq "0") || ($v eq "1")} {
        return true
    }

    ##
    # Check for X/Z values
    #
    if {0 && (($v eq "X") || ($v eq "Z"))} {
        return true
    }

    ##
    # Check power/ground
    #
    if {0 && ([$db flag $net is power] || [$db flag $net is ground])} {
        return true
    }

    return false
}


# =============================================================================
# Run -
# =============================================================================
#
proc ReportConstantNets:Run {db} {
    ##
    # Return if the database is empty.
    #
    if {$db == {}} {
        return
    }

    set resList {}              ;# result List

    ##
    # loop over all nets in all modules
    #
    $db foreach module mod {
        $db foreach net $mod net {
            ##
            # Check for constant nets.
            #
            if {[ReportConstantNets:_isConstant $db $net]} {
                $db foreach pin $net pin {
                    lappend resList $pin
                }
            }
        }
    }

    ##
    # Clear and activate the Mem Window
    #
    gui mem clear
    gui window show Mem
    gui window show Schem

    ##
    # Store the result into the Mem Window.
    #
    gui mem append $resList
}


# =============================================================================
# Call the initialization procedure.
# =============================================================================
#
ReportConstantNets:Init