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Current File : /opt/imh/python3.13/lib/thread2.8.9/ttrace.tcl
#
# ttrace.tcl --
#
# Copyright (C) 2003 Zoran Vasiljevic, Archiware GmbH. All Rights Reserved.
#
# See the file "license.terms" for information on usage and redistribution of
# this file, and for a DISCLAIMER OF ALL WARRANTIES.
# ----------------------------------------------------------------------------
#
# User level commands:
#
#   ttrace::eval           top-level wrapper (ttrace-savvy eval)
#   ttrace::enable         activates registered Tcl command traces
#   ttrace::disable        terminates tracing of Tcl commands
#   ttrace::isenabled      returns true if ttrace is enabled
#   ttrace::cleanup        bring the interp to a pristine state
#   ttrace::update         update interp to the latest trace epoch
#   ttrace::config         setup some configuration options
#   ttrace::getscript      returns a script for initializing interps
#
# Commands used for/from trace callbacks:
#
#   ttrace::atenable       register callback to be done at trace enable
#   ttrace::atdisable      register callback to be done at trace disable
#   ttrace::addtrace       register user-defined tracer callback
#   ttrace::addscript      register user-defined script generator
#   ttrace::addresolver    register user-defined command resolver
#   ttrace::addcleanup     register user-defined cleanup procedures
#   ttrace::addentry       adds one entry into the named trace store
#   ttrace::getentry       returns the entry value from the named store
#   ttrace::delentry       removes the entry from the named store
#   ttrace::getentries     returns all entries from the named store
#   ttrace::preload        register procedures to be preloaded always
#
#
# Limitations:
#
#   o. [namespace forget] is still not implemented
#   o. [namespace origin cmd] breaks if cmd is not already defined
#
#      I left this deliberately. I didn't want to override the [namespace]
#      command in order to avoid potential slowdown.
#

namespace eval ttrace {

    # Setup some compatibility wrappers
    if {[info commands nsv_set] != ""} {
        variable tvers 0
        variable mutex ns_mutex
        variable elock [$mutex create traceepochmutex]
        # Import the underlying API; faster than recomputing
        interp alias {} [namespace current]::_array   {} nsv_array
        interp alias {} [namespace current]::_incr    {} nsv_incr
        interp alias {} [namespace current]::_lappend {} nsv_lappend
        interp alias {} [namespace current]::_names   {} nsv_names
        interp alias {} [namespace current]::_set     {} nsv_set
        interp alias {} [namespace current]::_unset   {} nsv_unset
    } elseif {![catch {
        variable tvers [package require Thread]
    }]} {
        variable mutex thread::mutex
        variable elock [$mutex create]
        # Import the underlying API; faster than recomputing
        interp alias {} [namespace current]::_array   {} tsv::array
        interp alias {} [namespace current]::_incr    {} tsv::incr
        interp alias {} [namespace current]::_lappend {} tsv::lappend
        interp alias {} [namespace current]::_names   {} tsv::names
        interp alias {} [namespace current]::_set     {} tsv::set
        interp alias {} [namespace current]::_unset   {} tsv::unset
    } else {
        error "requires NaviServer/AOLserver or Tcl threading extension"
    }

    # Keep in sync with the Thread package
    package provide Ttrace 2.8.9

    # Package variables
    variable resolvers ""     ; # List of registered resolvers
    variable tracers   ""     ; # List of registered cmd tracers
    variable scripts   ""     ; # List of registered script makers
    variable enables   ""     ; # List of trace-enable callbacks
    variable disables  ""     ; # List of trace-disable callbacks
    variable preloads  ""     ; # List of procedure names to preload
    variable enabled   0      ; # True if trace is enabled
    variable config           ; # Array with config options

    variable epoch     -1     ; # The initialization epoch
    variable cleancnt   0     ; # Counter of registered cleaners

    # Package private namespaces
    namespace eval resolve "" ; # Commands for resolving commands
    namespace eval trace   "" ; # Commands registered for tracing
    namespace eval enable  "" ; # Commands invoked at trace enable
    namespace eval disable "" ; # Commands invoked at trace disable
    namespace eval script  "" ; # Commands for generating scripts

    # Exported commands
    namespace export unknown

    # Initialize ttrace shared state
    if {[_array exists ttrace] == 0} {
        _set ttrace lastepoch $epoch
        _set ttrace epochlist ""
    }

    # Initially, allow creation of epochs
    set config(-doepochs) 1

    proc eval {cmd args} {
        enable
        set code [catch {uplevel 1 [concat $cmd $args]} result]
        disable
        if {$code == 0} {
            if {[llength [info commands ns_ictl]]} {
                ns_ictl save [getscript]
            } else {
                thread::broadcast {
                    package require Ttrace
                    ttrace::update
                }
            }
        }
        return -code $code \
            -errorinfo $::errorInfo -errorcode $::errorCode $result
    }

    proc config {args} {
        variable config
        if {[llength $args] == 0} {
            array get config
        } elseif {[llength $args] == 1} {
            set opt [lindex $args 0]
            set config($opt)
        } else {
            set opt [lindex $args 0]
            set val [lindex $args 1]
            set config($opt) $val
        }
    }

    proc enable {} {
        variable config
        variable tracers
        variable enables
        variable enabled
        incr enabled 1
        if {$enabled > 1} {
            return
        }
        if {$config(-doepochs) != 0} {
            variable epoch [_newepoch]
        }
        set nsp [namespace current]
        foreach enabler $enables {
            enable::_$enabler
        }
        foreach trace $tracers {
            if {[info commands $trace] != ""} {
                trace add execution $trace leave ${nsp}::trace::_$trace
            }
        }
    }

    proc disable {} {
        variable enabled
        variable tracers
        variable disables
        incr enabled -1
        if {$enabled > 0} {
            return
        }
        set nsp [namespace current]
        foreach disabler $disables {
            disable::_$disabler
        }
        foreach trace $tracers {
            if {[info commands $trace] != ""} {
                trace remove execution $trace leave ${nsp}::trace::_$trace
            }
        }
    }

    proc isenabled {} {
        variable enabled
        expr {$enabled > 0}
    }

    proc update {{from -1}} {
        if {$from < 0} {
            variable epoch [_set ttrace lastepoch]
        } else {
            if {[lsearch [_set ttrace epochlist] $from] < 0} {
                error "no such epoch: $from"
            }
            variable epoch $from
        }
        uplevel 1 [getscript]
    }

    proc getscript {} {
        variable preloads
        variable epoch
        variable scripts
        append script [_serializensp] \n
        append script "::namespace eval [namespace current] {" \n
        append script "::namespace export unknown" \n
        append script "_useepoch $epoch" \n
        append script "}" \n
        foreach cmd $preloads {
            append script [_serializeproc $cmd] \n
        }
        foreach maker $scripts {
            append script [script::_$maker]
        }
        return $script
    }

    proc cleanup {args} {
        foreach cmd [info commands resolve::cleaner_*] {
            uplevel 1 $cmd $args
        }
    }

    proc preload {cmd} {
        variable preloads
        if {[lsearch $preloads $cmd] < 0} {
            lappend preloads $cmd
        }
    }

    proc atenable {cmd arglist body} {
        variable enables
        if {[lsearch $enables $cmd] < 0} {
            lappend enables $cmd
            set cmd [namespace current]::enable::_$cmd
            proc $cmd $arglist $body
            return $cmd
        }
    }

    proc atdisable {cmd arglist body} {
        variable disables
        if {[lsearch $disables $cmd] < 0} {
            lappend disables $cmd
            set cmd [namespace current]::disable::_$cmd
            proc $cmd $arglist $body
            return $cmd
        }
    }

    proc addtrace {cmd arglist body} {
        variable tracers
        if {[lsearch $tracers $cmd] < 0} {
            lappend tracers $cmd
            set tracer [namespace current]::trace::_$cmd
            proc $tracer $arglist $body
            if {[isenabled]} {
                trace add execution $cmd leave $tracer
            }
            return $tracer
        }
    }

    proc addscript {cmd body} {
        variable scripts
        if {[lsearch $scripts $cmd] < 0} {
            lappend scripts $cmd
            set cmd [namespace current]::script::_$cmd
            proc $cmd args $body
            return $cmd
        }
    }

    proc addresolver {cmd arglist body} {
        variable resolvers
        if {[lsearch $resolvers $cmd] < 0} {
            lappend resolvers $cmd
            set cmd [namespace current]::resolve::$cmd
            proc $cmd $arglist $body
            return $cmd
        }
    }

    proc addcleanup {body} {
        variable cleancnt
        set cmd [namespace current]::resolve::cleaner_[incr cleancnt]
        proc $cmd args $body
        return $cmd
    }

    proc addentry {cmd var val} {
        variable epoch
        _set ${epoch}-$cmd $var $val
    }

    proc delentry {cmd var} {
        variable epoch
        set ei $::errorInfo
        set ec $::errorCode
        catch {_unset ${epoch}-$cmd $var}
        set ::errorInfo $ei
        set ::errorCode $ec
    }

    proc getentry {cmd var} {
        variable epoch
        set ei $::errorInfo
        set ec $::errorCode
        if {[catch {_set ${epoch}-$cmd $var} val]} {
            set ::errorInfo $ei
            set ::errorCode $ec
            set val ""
        }
        return $val
    }

    proc getentries {cmd {pattern *}} {
        variable epoch
        _array names ${epoch}-$cmd $pattern
    }

    proc unknown {args} {
        set cmd [lindex $args 0]
        if {[uplevel 1 ttrace::_resolve [list $cmd]]} {
            set c [catch {uplevel 1 $cmd [lrange $args 1 end]} r]
        } else {
            set c [catch {uplevel 1 ::tcl::unknown $args} r]
        }
        return -code $c -errorcode $::errorCode -errorinfo $::errorInfo $r
    }

    proc _resolve {cmd} {
        variable resolvers
        foreach resolver $resolvers {
            if {[uplevel 1 [info comm resolve::$resolver] [list $cmd]]} {
                return 1
            }
        }
        return 0
    }

    proc _getthread {} {
        if {[info commands ns_thread] == ""} {
            thread::id
        } else {
            ns_thread getid
        }
    }

    proc _getthreads {} {
        if {[info commands ns_thread] == ""} {
            return [thread::names]
        } else {
            foreach entry [ns_info threads] {
                lappend threads [lindex $entry 2]
            }
            return $threads
        }
    }

    proc _newepoch {} {
        variable elock
        variable mutex
        $mutex lock $elock
        set old [_set ttrace lastepoch]
        set new [_incr ttrace lastepoch]
        _lappend ttrace $new [_getthread]
        if {$old >= 0} {
            _copyepoch $old $new
            _delepochs
        }
        _lappend ttrace epochlist $new
        $mutex unlock $elock
        return $new
    }

    proc _copyepoch {old new} {
        foreach var [_names $old-*] {
            set cmd [lindex [split $var -] 1]
            _array reset $new-$cmd [_array get $var]
        }
    }

    proc _delepochs {} {
        set tlist [_getthreads]
        set elist ""
        foreach epoch [_set ttrace epochlist] {
            if {[_dropepoch $epoch $tlist] == 0} {
                lappend elist $epoch
            } else {
                _unset ttrace $epoch
            }
        }
        _set ttrace epochlist $elist
    }

    proc _dropepoch {epoch threads} {
        set self [_getthread]
        foreach tid [_set ttrace $epoch] {
            if {$tid != $self && [lsearch $threads $tid] >= 0} {
                lappend alive $tid
            }
        }
        if {[info exists alive]} {
            _set ttrace $epoch $alive
            return 0
        } else {
            foreach var [_names $epoch-*] {
                _unset $var
            }
            return 1
        }
    }

    proc _useepoch {epoch} {
        if {$epoch >= 0} {
            set tid [_getthread]
            if {[lsearch [_set ttrace $epoch] $tid] == -1} {
                _lappend ttrace $epoch $tid
            }
        }
    }

    proc _serializeproc {cmd} {
        set dargs [info args $cmd]
        set pbody [info body $cmd]
        set pargs ""
        foreach arg $dargs {
            if {![info default $cmd $arg def]} {
                lappend pargs $arg
            } else {
                lappend pargs [list $arg $def]
            }
        }
        set nsp [namespace qual $cmd]
        if {$nsp == ""} {
            set nsp "::"
        }
        append res [list ::namespace eval $nsp] " {" \n
        append res [list ::proc [namespace tail $cmd] $pargs $pbody] \n
        append res "}" \n
    }

    proc _serializensp {{nsp ""} {result _}} {
        upvar $result res
        if {$nsp == ""} {
            set nsp [namespace current]
        }
        append res [list ::namespace eval $nsp] " {" \n
        foreach var [info vars ${nsp}::*] {
            set vname [namespace tail $var]
            if {[array exists $var] == 0} {
                append res [list ::variable $vname [set $var]] \n
            } else {
                append res [list ::variable $vname] \n
                append res [list ::array set $vname [array get $var]] \n
            }
        }
        foreach cmd [info procs ${nsp}::*] {
            append res [_serializeproc $cmd] \n
        }
        append res "}" \n
        foreach nn [namespace children $nsp] {
            _serializensp $nn res
        }
        return $res
    }
}

#
# The code below is ment to be run once during the application start.  It
# provides implementation of tracing callbacks for some Tcl commands.  Users
# can supply their own tracer implementations on-the-fly.
#
# The code below will create traces for the following Tcl commands:
#    "namespace", "variable", "load", "proc" and "rename"
#
# Also, the Tcl object extension XOTcl 1.1.0 is handled and all XOTcl related
# things, like classes and objects are traced (many thanks to Gustaf Neumann
# from XOTcl for his kind help and support).
#

eval {

    #
    # Register the "load" trace. This will create the following key/value pair
    # in the "load" store:
    #
    #  --- key ----              --- value ---
    #  <path_of_loaded_image>    <name_of_the_init_proc>
    #
    # We normally need only the name_of_the_init_proc for being able to load
    # the package in other interpreters, but we store the path to the image
    # file as well.
    #

    ttrace::addtrace load {cmdline code args} {
        if {$code != 0} {
            return
        }
        set image [lindex $cmdline 1]
        set initp [lindex $cmdline 2]
        if {$initp == ""} {
            foreach pkg [info loaded] {
                if {[lindex $pkg 0] == $image} {
                    set initp [lindex $pkg 1]
                }
            }
        }
        ttrace::addentry load $image $initp
    }

    ttrace::addscript load {
        append res "\n"
        foreach entry [ttrace::getentries load] {
            set initp [ttrace::getentry load $entry]
            append res "::load {} $initp" \n
        }
        return $res
    }

    #
    # Register the "namespace" trace. This will create the following key/value
    # entry in "namespace" store:
    #
    #  --- key ----                   --- value ---
    #  ::fully::qualified::namespace  1
    #
    # It will also fill the "proc" store for procedures and commands imported
    # in this namespace with following:
    #
    #  --- key ----                   --- value ---
    #  ::fully::qualified::proc       [list <ns>  "" ""]
    #
    # The <ns> is the name of the namespace where the command or procedure is
    # imported from.
    #

    ttrace::addtrace namespace {cmdline code args} {
        if {$code != 0} {
            return
        }
        set nop [lindex $cmdline 1]
        set cns [uplevel 1 namespace current]
        if {$cns == "::"} {
            set cns ""
        }
        switch -glob $nop {
            eva* {
                set nsp [lindex $cmdline 2]
                if {![string match "::*" $nsp]} {
                    set nsp ${cns}::$nsp
                }
                ttrace::addentry namespace $nsp 1
            }
            imp* {
                # - parse import arguments (skip opt "-force")
                set opts [lrange $cmdline 2 end]
                if {[string match "-fo*" [lindex $opts 0]]} {
                    set opts [lrange $cmdline 3 end]
                }
                # - register all imported procs and commands
                foreach opt $opts {
                    if {![string match "::*" [::namespace qual $opt]]} {
                        set opt ${cns}::$opt
                    }
                    # - first import procs
                    foreach entry [ttrace::getentries proc $opt] {
                        set cmd ${cns}::[::namespace tail $entry]
                        set nsp [::namespace qual $entry]
                        set done($cmd) 1
                        set entry [list 0 $nsp "" ""]
                        ttrace::addentry proc $cmd $entry
                    }

                    # - then import commands
                    foreach entry [info commands $opt] {
                        set cmd ${cns}::[::namespace tail $entry]
                        set nsp [::namespace qual $entry]
                        if {[info exists done($cmd)] == 0} {
                            set entry [list 0 $nsp "" ""]
                            ttrace::addentry proc $cmd $entry
                        }
                    }
                }
            }
        }
    }

    ttrace::addscript namespace {
        append res \n
        foreach entry [ttrace::getentries namespace] {
            append res "::namespace eval $entry {}" \n
        }
        return $res
    }

    #
    # Register the "variable" trace. This will create the following key/value
    # entry in the "variable" store:
    #
    #  --- key ----                   --- value ---
    #  ::fully::qualified::variable   1
    #
    # The variable value itself is ignored at the time of
    # trace/collection. Instead, we take the real value at the time of script
    # generation.
    #

    ttrace::addtrace variable {cmdline code args} {
        if {$code != 0} {
            return
        }
        set opts [lrange $cmdline 1 end]
        if {[llength $opts]} {
            set cns [uplevel 1 namespace current]
            if {$cns == "::"} {
                set cns ""
            }
            foreach {var val} $opts {
                if {![string match "::*" $var]} {
                    set var ${cns}::$var
                }
                ttrace::addentry variable $var 1
            }
        }
    }

    ttrace::addscript variable {
        append res \n
        foreach entry [ttrace::getentries variable] {
            set cns [namespace qual $entry]
            set var [namespace tail $entry]
            append res "::namespace eval $cns {" \n
            append res "::variable $var"
            if {[array exists $entry]} {
                append res "\n::array set $var [list [array get $entry]]" \n
            } elseif {[info exists $entry]} {
                append res " [list [set $entry]]" \n
            } else {
                append res \n
            }
            append res "}" \n
        }
        return $res
    }


    #
    # Register the "rename" trace. It will create the following key/value pair
    # in "rename" store:
    #
    #  --- key ----              --- value ---
    #  ::fully::qualified::old  ::fully::qualified::new
    #
    # The "new" value may be empty, for commands that have been deleted. In
    # such cases we also remove any traced procedure definitions.
    #

    ttrace::addtrace rename {cmdline code args} {
        if {$code != 0} {
            return
        }
        set cns [uplevel 1 namespace current]
        if {$cns == "::"} {
            set cns ""
        }
        set old [lindex $cmdline 1]
        if {![string match "::*" $old]} {
            set old ${cns}::$old
        }
        set new [lindex $cmdline 2]
        if {$new != ""} {
            if {![string match "::*" $new]} {
                set new ${cns}::$new
            }
            ttrace::addentry rename $old $new
        } else {
            ttrace::delentry proc $old
        }
    }

    ttrace::addscript rename {
        append res \n
        foreach old [ttrace::getentries rename] {
            set new [ttrace::getentry rename $old]
            append res "::rename $old {$new}" \n
        }
        return $res
    }

    #
    # Register the "proc" trace. This will create the following key/value pair
    # in the "proc" store:
    #
    #  --- key ----              --- value ---
    #  ::fully::qualified::proc  [list <epoch> <ns> <arglist> <body>]
    #
    # The <epoch> chages anytime one (re)defines a proc.  The <ns> is the
    # namespace where the command was imported from. If empty, the <arglist>
    # and <body> will hold the actual procedure definition. See the
    # "namespace" tracer implementation also.
    #

    ttrace::addtrace proc {cmdline code args} {
        if {$code != 0} {
            return
        }
        set cns [uplevel 1 namespace current]
        if {$cns == "::"} {
            set cns ""
        }
        set cmd [lindex $cmdline 1]
        if {![string match "::*" $cmd]} {
            set cmd ${cns}::$cmd
        }
        set dargs [info args $cmd]
        set pbody [info body $cmd]
        set pargs ""
        foreach arg $dargs {
            if {![info default $cmd $arg def]} {
                lappend pargs $arg
            } else {
                lappend pargs [list $arg $def]
            }
        }
        set pdef [ttrace::getentry proc $cmd]
        if {$pdef == ""} {
            set epoch -1 ; # never traced before
        } else {
            set epoch [lindex $pdef 0]
        }
        ttrace::addentry proc $cmd [list [incr epoch] "" $pargs $pbody]
    }

    ttrace::addscript proc {
        return {
            if {[info command ::tcl::unknown] == ""} {
                rename ::unknown ::tcl::unknown
                namespace import -force ::ttrace::unknown
            }
            if {[info command ::tcl::info] == ""} {
                rename ::info ::tcl::info
            }
            proc ::info args {
                set cmd [lindex $args 0]
                set hit [lsearch -glob {commands procs args default body} $cmd*]
                if {$hit > 1} {
                    if {[catch {uplevel 1 ::tcl::info $args}]} {
                        uplevel 1 ttrace::_resolve [list [lindex $args 1]]
                    }
                    return [uplevel 1 ::tcl::info $args]
                }
                if {$hit == -1} {
                    return [uplevel 1 ::tcl::info $args]
                }
                set cns [uplevel 1 namespace current]
                if {$cns == "::"} {
                    set cns ""
                }
                set pat [lindex $args 1]
                if {![string match "::*" $pat]} {
                    set pat ${cns}::$pat
                }
                set fns [ttrace::getentries proc $pat]
                if {[string match $cmd* commands]} {
                    set fns [concat $fns [ttrace::getentries xotcl $pat]]
                }
                foreach entry $fns {
                    if {$cns != [namespace qual $entry]} {
                        set lazy($entry) 1
                    } else {
                        set lazy([namespace tail $entry]) 1
                    }
                }
                foreach entry [uplevel 1 ::tcl::info $args] {
                    set lazy($entry) 1
                }
                array names lazy
            }
        }
    }

    #
    # Register procedure resolver. This will try to resolve the command in the
    # current namespace first, and if not found, in global namespace.  It also
    # handles commands imported from other namespaces.
    #

    ttrace::addresolver resolveprocs {cmd {export 0}} {
        set cns [uplevel 1 namespace current]
        set name [namespace tail $cmd]
        if {$cns == "::"} {
            set cns ""
        }
        if {![string match "::*" $cmd]} {
            set ncmd ${cns}::$cmd
            set gcmd ::$cmd
        } else {
            set ncmd $cmd
            set gcmd $cmd
        }
        set pdef [ttrace::getentry proc $ncmd]
        if {$pdef == ""} {
            set pdef [ttrace::getentry proc $gcmd]
            if {$pdef == ""} {
                return 0
            }
            set cmd $gcmd
        } else {
            set cmd $ncmd
        }
        set epoch [lindex $pdef 0]
        set pnsp  [lindex $pdef 1]
        if {$pnsp != ""} {
            set nsp [namespace qual $cmd]
            if {$nsp == ""} {
                set nsp ::
            }
            set cmd ${pnsp}::$name
            if {[resolveprocs $cmd 1] == 0 && [info commands $cmd] == ""} {
                return 0
            }
            namespace eval $nsp "namespace import -force $cmd"
        } else {
            uplevel 0 [list ::proc $cmd [lindex $pdef 2] [lindex $pdef 3]]
            if {$export} {
                set nsp [namespace qual $cmd]
                if {$nsp == ""} {
                    set nsp ::
                }
                namespace eval $nsp "namespace export $name"
            }
        }
        variable resolveproc
        set resolveproc($cmd) $epoch
        return 1
    }

    #
    # For XOTcl, the entire item introspection/tracing is delegated to XOTcl
    # itself. The xotcl store is filled with this:
    #
    #  --- key ----               --- value ---
    #  ::fully::qualified::item   <body>
    #
    # The <body> is the script used to generate the entire item (class,
    # object). Note that we do not fill in this during code tracing. It is
    # done during the script generation. In this step, only the placeholder is
    # set.
    #
    # NOTE: we assume all XOTcl commands are imported in global namespace
    #

    ttrace::atenable XOTclEnabler {args} {
        if {[info commands ::xotcl::Class] == ""} {
            return
        }
        if {[info commands ::xotcl::_creator] == ""} {
            ::xotcl::Class create ::xotcl::_creator -instproc create {args} {
                set result [next]
                if {![string match ::xotcl::_* $result]} {
                    ttrace::addentry xotcl $result ""
                }
                return $result
            }
        }
        ::xotcl::Class instmixin ::xotcl::_creator
    }

    ttrace::atdisable XOTclDisabler {args} {
        if {   [info commands ::xotcl::Class] == ""
            || [info commands ::xotcl::_creator] == ""} {
            return
        }
        ::xotcl::Class instmixin ""
        ::xotcl::_creator destroy
    }

    set resolver [ttrace::addresolver resolveclasses {classname} {
        set cns [uplevel 1 namespace current]
        set script [ttrace::getentry xotcl $classname]
        if {$script == ""} {
            set name [namespace tail $classname]
            if {$cns == "::"} {
                set script [ttrace::getentry xotcl ::$name]
            } else {
                set script [ttrace::getentry xotcl ${cns}::$name]
                if {$script == ""} {
                    set script [ttrace::getentry xotcl ::$name]
                }
            }
            if {$script == ""} {
                return 0
            }
        }
        uplevel 1 [list namespace eval $cns $script]
        return 1
    }]

    ttrace::addscript xotcl [subst -nocommands {
        if {![catch {Serializer new} ss]} {
            foreach entry [ttrace::getentries xotcl] {
                if {[ttrace::getentry xotcl \$entry] == ""} {
                    ttrace::addentry xotcl \$entry [\$ss serialize \$entry]
                }
            }
            \$ss destroy
            return {::xotcl::Class proc __unknown name {$resolver \$name}}
        }
    }]

    #
    # Register callback to be called on cleanup. This will trash lazily loaded
    # procs which have changed since.
    #

    ttrace::addcleanup {
        variable resolveproc
        foreach cmd [array names resolveproc] {
            set def [ttrace::getentry proc $cmd]
            if {$def != ""} {
                set new [lindex $def 0]
                set old $resolveproc($cmd)
                if {[info command $cmd] != "" && $new != $old} {
                    catch {rename $cmd ""}
                }
            }
        }
    }
}

# EOF
return

# Local Variables:
# mode: tcl
# fill-column: 78
# tab-width: 8
# indent-tabs-mode: nil
# End:

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