summaryrefslogtreecommitdiffstats
path: root/tests/tailcall.test
blob: 2d04f82012cacee3787a48db7e948e09ae6bdaf6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
# 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 6-list with: C-stack depth, iPtr->numlevels,
	# cmdFrame level, callFrame level, tosPtr 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 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 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 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 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 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 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 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: