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# # 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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