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|
# Commands covered: tailcall
#
# This file contains a collection of tests for experimental commands that are
# found in ::tcl::unsupported. The tests will migrate to normal test files
# if/when the commands find their way into the core.
#
# Copyright (c) 2008 by Miguel Sofer.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
if {[lsearch [namespace children] ::tcltest] == -1} {
package require tcltest
namespace import -force ::tcltest::*
}
::tcltest::loadTestedCommands
catch [list package require -exact Tcltest [info patchlevel]]
testConstraint testnrelevels [llength [info commands testnrelevels]]
#
# The tests that risked blowing the C stack on failure have been removed: we
# can now actually measure using testnrelevels.
#
if {[testConstraint testnrelevels]} {
namespace eval testnre {
#
# [testnrelevels] returns a 5-list with: C-stack depth, iPtr->numlevels,
# cmdFrame level, callFrame level and callback depth
#
variable last [testnrelevels]
proc depthDiff {} {
variable last
set depth [testnrelevels]
set res {}
foreach t $depth l $last {
lappend res [expr {$t-$l}]
}
set last $depth
return $res
}
namespace export *
}
namespace import testnre::*
}
proc errorcode options {
dict get [dict merge {-errorcode NONE} $options] -errorcode
}
test tailcall-0.1 {tailcall is constant space} -constraints testnrelevels -setup {
proc a i {
#
# NOTE: there may be a diff in callback depth with the first call
# ($i==0) due to the fact that the first is from an eval. Successive
# calls should add nothing to any stack depths.
#
if {$i == 1} {
depthDiff
}
if {[incr i] > 10} {
return [depthDiff]
}
tailcall a $i
}
} -body {
a 0
} -cleanup {
rename a {}
} -result {0 0 0 0 0}
test tailcall-0.2 {tailcall is constant space} -constraints testnrelevels -setup {
set a { i {
if {$i == 1} {
depthDiff
}
if {[incr i] > 10} {
return [depthDiff]
}
upvar 1 a a
tailcall apply $a $i
}}
} -body {
apply $a 0
} -cleanup {
unset a
} -result {0 0 0 0 0}
test tailcall-0.3 {tailcall is constant space} -constraints testnrelevels -setup {
proc a i {
if {$i == 1} {
depthDiff
}
if {[incr i] > 10} {
return [depthDiff]
}
tailcall b $i
}
interp alias {} b {} a
} -body {
b 0
} -cleanup {
rename a {}
rename b {}
} -result {0 0 0 0 0}
test tailcall-0.4 {tailcall is constant space} -constraints testnrelevels -setup {
namespace eval ::ns {
namespace export *
}
proc ::ns::a i {
if {$i == 1} {
depthDiff
}
if {[incr i] > 10} {
return [depthDiff]
}
set b [uplevel 1 [list namespace which b]]
tailcall $b $i
}
namespace import ::ns::a
rename a b
} -body {
b 0
} -cleanup {
rename b {}
namespace delete ::ns
} -result {0 0 0 0 0}
test tailcall-0.5 {tailcall is constant space} -constraints testnrelevels -setup {
proc b i {
if {$i == 1} {
depthDiff
}
if {[incr i] > 10} {
return [depthDiff]
}
tailcall a b $i
}
namespace ensemble create -command a -map {b b}
} -body {
a b 0
} -cleanup {
rename a {}
rename b {}
} -result {0 0 0 0 0}
test tailcall-0.6 {tailcall is constant space} -constraints {testnrelevels knownBug} -setup {
#
# This test fails because ns-unknown is not NR-enabled
#
proc c i {
if {$i == 1} {
depthDiff
}
if {[incr i] > 10} {
return [depthDiff]
}
tailcall a b $i
}
proc d {ens sub args} {
return [list $ens c]
}
namespace ensemble create -command a -unknown d
} -body {
a b 0
} -cleanup {
rename a {}
rename c {}
rename d {}
} -result {0 0 0 0 0}
test tailcall-0.7 {tailcall is constant space} -constraints testnrelevels -setup {
catch {rename foo {}}
oo::class create foo {
method b i {
if {$i == 1} {
depthDiff
}
if {[incr i] > 10} {
return [depthDiff]
}
tailcall [self] b $i
}
}
} -body {
foo create a
a b 0
} -cleanup {
rename a {}
rename foo {}
} -result {0 0 0 0 0}
test tailcall-1 {tailcall} -body {
namespace eval a {
variable x *::a
proc xset {} {
set tmp {}
set ns {[namespace current]}
set level [info level]
for {set i 0} {$i <= [info level]} {incr i} {
uplevel #$i "set x $i$ns"
lappend tmp "$i [info level $i]"
}
lrange $tmp 1 end
}
proc foo {} {tailcall xset; set x noreach}
}
namespace eval b {
variable x *::b
proc xset args {error b::xset}
proc moo {} {set x 0; variable y [::a::foo]; set x}
}
variable x *::
proc xset args {error ::xset}
list [::b::moo] | $x $a::x $b::x | $::b::y
} -cleanup {
unset x
rename xset {}
namespace delete a b
} -result {1::b | 0:: *::a *::b | {{1 ::b::moo} {2 xset}}}
test tailcall-2 {tailcall in non-proc} -body {
namespace eval a [list tailcall set x 1]
} -match glob -result *tailcall* -returnCodes error
test tailcall-3 {tailcall falls off tebc} -body {
unset -nocomplain x
proc foo {} {tailcall set x 1}
list [catch foo msg] $msg [set x]
} -cleanup {
rename foo {}
unset x
} -result {0 1 1}
test tailcall-4 {tailcall falls off tebc} -body {
set x 2
proc foo {} {tailcall set x 1}
foo
set x
} -cleanup {
rename foo {}
unset x
} -result 1
test tailcall-5 {tailcall falls off tebc} -body {
set x 2
namespace eval bar {
variable x 3
proc foo {} {tailcall set x 1}
}
bar::foo
list $x $bar::x
} -cleanup {
unset x
namespace delete bar
} -result {1 3}
test tailcall-6 {tailcall does remove callframes} -body {
proc foo {} {info level}
proc moo {} {tailcall foo}
proc boo {} {expr {[moo] - [info level]}}
boo
} -cleanup {
rename foo {}
rename moo {}
rename boo {}
} -result 1
test tailcall-7 {tailcall does return} -setup {
namespace eval ::foo {
variable res {}
proc a {} {
variable res
append res a
tailcall set x 1
append res a
}
proc b {} {
variable res
append res b
a
append res b
}
proc c {} {
variable res
append res c
b
append res c
}
}
} -body {
namespace eval ::foo c
} -cleanup {
namespace delete ::foo
} -result cbabc
test tailcall-8 {tailcall tailcall} -setup {
namespace eval ::foo {
variable res {}
proc a {} {
variable res
append res a
tailcall tailcall set x 1
append res a
}
proc b {} {
variable res
append res b
a
append res b
}
proc c {} {
variable res
append res c
b
append res c
}
}
} -body {
namespace eval ::foo c
} -cleanup {
namespace delete ::foo
} -result cbac
test tailcall-9 {tailcall factorial} -setup {
proc fact {n {b 1}} {
if {$n == 1} {
return $b
}
tailcall fact [expr {$n-1}] [expr {$n*$b}]
}
} -body {
list [fact 1] [fact 5] [fact 10] [fact 15]
} -cleanup {
rename fact {}
} -result {1 120 3628800 1307674368000}
test tailcall-10a {tailcall and eval} -setup {
set ::x 0
proc a {} {
eval [list tailcall lappend ::x 2]
set ::x 1
}
} -body {
list [a] $::x
} -cleanup {
unset -nocomplain ::x
} -result {{0 2} {0 2}}
test tailcall-10b {tailcall and eval} -setup {
set ::x 0
proc a {} {
eval {tailcall lappend ::x 2}
set ::x 1
}
} -body {
list [a] $::x
} -cleanup {
unset -nocomplain ::x
} -result {{0 2} {0 2}}
test tailcall-11a {tailcall and uplevel} -setup {
proc a {} {
uplevel 1 [list tailcall set ::x 2]
set ::x 1
}
} -body {
list [a] $::x
} -cleanup {
unset -nocomplain ::x
} -match glob -result *tailcall* -returnCodes error
test tailcall-11b {tailcall and uplevel} -setup {
proc a {} {
uplevel 1 {tailcall set ::x 2}
set ::x 1
}
} -body {
list [a] $::x
} -cleanup {
unset -nocomplain ::x
} -match glob -result *tailcall* -returnCodes error
test tailcall-11c {tailcall and uplevel} -setup {
proc a {} {
uplevel 1 {tailcall lappend ::x 2}
set ::x 1
}
proc b {} {set ::x 0; a; lappend ::x 3}
} -body {
list [b] $::x
} -cleanup {
rename a {}
rename b {}
unset -nocomplain ::x
} -result {{0 3 2} {0 3 2}}
test tailcall-12.1 {[Bug 2649975]} -setup {
proc dump {{text {}}} {
set text [uplevel 1 [list subst $text]]
set l [expr {[info level] -1}]
if {$text eq {}} {
set text [info level $l]
}
puts "$l: $text"
}
# proc dump args {}
proc bravo {} {
upvar 1 v w
dump {inside bravo, v -> $w}
set v "procedure bravo"
#uplevel 1 [list delta ::betty]
uplevel 1 {delta ::betty}
return $::resolution
}
proc delta name {
upvar 1 v w
dump {inside delta, v -> $w}
set v "procedure delta"
tailcall foxtrot
}
proc foxtrot {} {
upvar 1 v w
dump {inside foxtrot, v -> $w}
global resolution
set ::resolution $w
}
set v "global level"
} -body {
set result [bravo]
if {$result ne $v} {
puts "v should have been found at $v but was found in $result"
}
} -cleanup {
unset v
rename dump {}
rename bravo {}
rename delta {}
rename foxtrot {}
} -output {1: inside bravo, v -> global level
1: inside delta, v -> global level
1: inside foxtrot, v -> global level
}
test tailcall-12.2 {[Bug 2649975]} -setup {
proc dump {{text {}}} {
set text [uplevel 1 [list subst $text]]
set l [expr {[info level] -1}]
if {$text eq {}} {
set text [info level $l]
}
puts "$l: $text"
}
# proc dump args {}
set v "global level"
oo::class create foo { # like connection
method alpha {} { # like connections 'tables' method
dump
upvar 1 v w
dump {inside foo's alpha, v resolves to $w}
set v "foo's method alpha"
dump {foo's alpha is calling [self] bravo - v should resolve at global level}
set result [uplevel 1 [list [self] bravo]]
dump {exiting from foo's alpha}
return $result
}
method bravo {} { # like connections 'foreach' method
dump
upvar 1 v w
dump {inside foo's bravo, v resolves to $w}
set v "foo's method bravo"
dump {foo's bravo is calling charlie to create barney}
set barney [my charlie ::barney]
dump {foo's bravo is calling bravo on $barney}
dump {v should resolve at global scope there}
set result [uplevel 1 [list $barney bravo]]
dump {exiting from foo's bravo}
return $result
}
method charlie {name} { # like tdbc prepare
dump
set v "foo's method charlie"
dump {tailcalling bar's constructor}
tailcall ::bar create $name
}
}
oo::class create bar { # like statement
method bravo {} { # like statement foreach method
dump
upvar 1 v w
dump {inside bar's bravo, v is resolving to $w}
set v "bar's method bravo"
dump {calling delta to construct betty - v should resolve global there}
uplevel 1 [list [self] delta ::betty]
dump {exiting from bar's bravo}
return [::betty whathappened]
}
method delta {name} { # like statement execute method
dump
upvar 1 v w
dump {inside bar's delta, v is resolving to $w}
set v "bar's method delta"
dump {tailcalling to construct $name as instance of grill}
dump {v should resolve at global level in grill's constructor}
dump {grill's constructor should run at level [info level]}
tailcall grill create $name
}
}
oo::class create grill {
variable resolution
constructor {} {
dump
upvar 1 v w
dump "in grill's constructor, v resolves to $w"
set resolution $w
}
method whathappened {} {
return $resolution
}
}
foo create fred
} -body {
set result [fred alpha]
if {$result ne "global level"} {
puts "v should have been found at global level but was found in $result"
}
} -cleanup {
unset result
rename fred {}
rename dump {}
rename foo {}
rename bar {}
rename grill {}
} -output {1: fred alpha
1: inside foo's alpha, v resolves to global level
1: foo's alpha is calling ::fred bravo - v should resolve at global level
1: ::fred bravo
1: inside foo's bravo, v resolves to global level
1: foo's bravo is calling charlie to create barney
2: my charlie ::barney
2: tailcalling bar's constructor
1: foo's bravo is calling bravo on ::barney
1: v should resolve at global scope there
1: ::barney bravo
1: inside bar's bravo, v is resolving to global level
1: calling delta to construct betty - v should resolve global there
1: ::barney delta ::betty
1: inside bar's delta, v is resolving to global level
1: tailcalling to construct ::betty as instance of grill
1: v should resolve at global level in grill's constructor
1: grill's constructor should run at level 1
1: grill create ::betty
1: in grill's constructor, v resolves to global level
1: exiting from bar's bravo
1: exiting from foo's bravo
1: exiting from foo's alpha
}
test tailcall-12.3a0 {[Bug 2695587]} -body {
apply {{} {
catch [list tailcall foo]
}}
} -returnCodes 1 -result {invalid command name "foo"}
test tailcall-12.3a1 {[Bug 2695587]} -body {
apply {{} {
catch [list tailcall foo]
tailcall
}}
} -result {}
test tailcall-12.3a2 {[Bug 2695587]} -body {
apply {{} {
catch [list tailcall foo]
tailcall moo
}}
} -returnCodes 1 -result {invalid command name "moo"}
test tailcall-12.3a3 {[Bug 2695587]} -body {
set x 0
apply {{} {
catch [list tailcall foo]
tailcall lappend x 1
}}
set x
} -cleanup {
unset x
} -result {0 1}
test tailcall-12.3b0 {[Bug 2695587]} -body {
apply {{} {
set catch catch
$catch [list tailcall foo]
}}
} -returnCodes 1 -result {invalid command name "foo"}
test tailcall-12.3b1 {[Bug 2695587]} -body {
apply {{} {
set catch catch
$catch [list tailcall foo]
tailcall
}}
} -result {}
test tailcall-12.3b2 {[Bug 2695587]} -body {
apply {{} {
set catch catch
$catch [list tailcall foo]
tailcall moo
}}
} -returnCodes 1 -result {invalid command name "moo"}
test tailcall-12.3b3 {[Bug 2695587]} -body {
set x 0
apply {{} {
set catch catch
$catch [list tailcall foo]
tailcall lappend x 1
}}
set x
} -cleanup {
unset x
} -result {0 1}
# MORE VARIANTS MISSING: bc'ed caught script vs (bc'ed, not-bc'ed)
# catch. Actually superfluous now, as tailcall just returns TCL_RETURN so that
# standard catch behaviour is required.
test tailcall-13.1 {directly tailcalling the tailcall command is ok} {
list [catch {
apply {{} {
apply {{} {
tailcall tailcall subst ok
subst b
}}
subst c
}}
} msg opt] $msg [errorcode $opt]
} {0 ok NONE}
test tailcall-13.2 {indirectly tailcalling the tailcall command is ok} {
list [catch {
apply {{} {
apply {{} {
tailcall eval tailcall subst ok
subst b
}}
subst c
}}
} msg opt] $msg [errorcode $opt]
} {0 ok NONE}
if {[testConstraint testnrelevels]} {
namespace forget testnre::*
namespace delete testnre
}
# cleanup
::tcltest::cleanupTests
# Local Variables:
# mode: tcl
# End:
|