floatingInputs.tcl

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###############################################################################
# Copyright (c) 2010-2024 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
#       Find Floating Inputs
#   @namespace
#       FloatingInputs
#   @section
#       Analyze the Loaded Database
#   @description
#       Loop over all signals and report signals that have no driver. Also
#       loop over all primitive instance pins and report unconnected inputs.
#   @non-interactive
#   @files
#       floatingInputs.tcl
#   @example
#       demo/spice/aquarius.sp
#   @cmdline
#       -hspice @example[0]
#       -userware @files[0]
#   @tag
#       spice netlist
###############################################################################


# =============================================================================
# Init - Initialize the plugin.
# =============================================================================
#
proc FloatingInputs:Init {} {
    global FloatingInputs

    set FloatingInputs(callbackRegistered) \
        [gui database runOrRegisterChangedCallback FloatingInputs:Run]
}


# =============================================================================
# Finit - Finalize the plugin.
# =============================================================================
#
proc FloatingInputs:Finit {} {
    global FloatingInputs

    if {$FloatingInputs(callbackRegistered)} {
        gui database removeChangedCallback FloatingInputs:Run
        set FloatingInputs(callbackRegistered) 0
    }
}


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

    ##
    # result List
    #
    set resList {}

    ##
    # normally there should be only one top module
    #
    $db foreach top top {
        $db flat foreach signal $top sig {
            ##
            # skip power, ground and negpower nets
            #
            if {[$db isPgNet $sig]} {
                continue
            }

            ##
            # skip constant valued nets, too
            #
            if {[$db value $sig] != ""} {
                continue
            }

            set driverCnt 0
            set inputCnt  0

            $db flat foreach pin $sig pin {
                if {[$db oid type $pin] == "port"} {
                    set driver "input"  ;# input port is driver
                } else {
                    set driver "output" ;# output pin is driver
                }
                set dir [$db directionOf $pin]
                if {$dir == $driver} {
                    incr driverCnt
                } elseif {$dir == "inout"} {
                    incr driverCnt
                } else {
                    incr inputCnt
                }
                if {$inputCnt && $driverCnt} {
                    ##
                    # speedup: we have all
                    #
                    break
                }
            }
            if {$inputCnt && !$driverCnt} {
                lappend resList $sig
            }
        }
    }
    $db foreach module mod {
        $db foreach inst $mod inst {
            if {[$db isModule $inst]} {
                ##
                # skip hier modules
                #
                continue
            }
            $db foreach pin $inst pin {
                if {[$db isConnected $pin]} {
                    continue
                }
                set dir [$db directionOf $pin]
                if {$dir == "input"} {
                    lappend resList $pin
                }
            }
        }
    }

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

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


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