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
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
|
-- $Id: testes/locals.lua $
-- See Copyright Notice in file all.lua
print('testing local variables and environments')
local debug = require"debug"
-- bug in 5.1:
local function f(x) x = nil; return x end
assert(f(10) == nil)
local function f() local x; return x end
assert(f(10) == nil)
local function f(x) x = nil; local y; return x, y end
assert(f(10) == nil and select(2, f(20)) == nil)
do
local i = 10
do local i = 100; assert(i==100) end
do local i = 1000; assert(i==1000) end
assert(i == 10)
if i ~= 10 then
local i = 20
else
local i = 30
assert(i == 30)
end
end
f = nil
local f
x = 1
a = nil
load('local a = {}')()
assert(a == nil)
function f (a)
local _1, _2, _3, _4, _5
local _6, _7, _8, _9, _10
local x = 3
local b = a
local c,d = a,b
if (d == b) then
local x = 'q'
x = b
assert(x == 2)
else
assert(nil)
end
assert(x == 3)
local f = 10
end
local b=10
local a; repeat local b; a,b=1,2; assert(a+1==b); until a+b==3
assert(x == 1)
f(2)
assert(type(f) == 'function')
local function getenv (f)
local a,b = debug.getupvalue(f, 1)
assert(a == '_ENV')
return b
end
-- test for global table of loaded chunks
assert(getenv(load"a=3") == _G)
local c = {}; local f = load("a = 3", nil, nil, c)
assert(getenv(f) == c)
assert(c.a == nil)
f()
assert(c.a == 3)
-- old test for limits for special instructions
do
local i = 2
local p = 4 -- p == 2^i
repeat
for j=-3,3 do
assert(load(string.format([[local a=%s;
a=a+%s;
assert(a ==2^%s)]], j, p-j, i), '')) ()
assert(load(string.format([[local a=%s;
a=a-%s;
assert(a==-2^%s)]], -j, p-j, i), '')) ()
assert(load(string.format([[local a,b=0,%s;
a=b-%s;
assert(a==-2^%s)]], -j, p-j, i), '')) ()
end
p = 2 * p; i = i + 1
until p <= 0
end
print'+'
if rawget(_G, "T") then
-- testing clearing of dead elements from tables
collectgarbage("stop") -- stop GC
local a = {[{}] = 4, [3] = 0, alo = 1,
a1234567890123456789012345678901234567890 = 10}
local t = T.querytab(a)
for k,_ in pairs(a) do a[k] = undef end
collectgarbage() -- restore GC and collect dead fields in 'a'
for i=0,t-1 do
local k = querytab(a, i)
assert(k == nil or type(k) == 'number' or k == 'alo')
end
-- testing allocation errors during table insertions
local a = {}
local function additems ()
a.x = true; a.y = true; a.z = true
a[1] = true
a[2] = true
end
for i = 1, math.huge do
T.alloccount(i)
local st, msg = pcall(additems)
T.alloccount()
local count = 0
for k, v in pairs(a) do
assert(a[k] == v)
count = count + 1
end
if st then assert(count == 5); break end
end
end
-- testing lexical environments
assert(_ENV == _G)
do
local dummy
local _ENV = (function (...) return ... end)(_G, dummy) -- {
do local _ENV = {assert=assert}; assert(true) end
mt = {_G = _G}
local foo,x
A = false -- "declare" A
do local _ENV = mt
function foo (x)
A = x
do local _ENV = _G; A = 1000 end
return function (x) return A .. x end
end
end
assert(getenv(foo) == mt)
x = foo('hi'); assert(mt.A == 'hi' and A == 1000)
assert(x('*') == mt.A .. '*')
do local _ENV = {assert=assert, A=10};
do local _ENV = {assert=assert, A=20};
assert(A==20);x=A
end
assert(A==10 and x==20)
end
assert(x==20)
do -- constants
local a<const>, b, c<const> = 10, 20, 30
b = a + c + b -- 'b' is not constant
assert(a == 10 and b == 60 and c == 30)
local function checkro (name, code)
local st, msg = load(code)
local gab = string.format("attempt to assign to const variable '%s'", name)
assert(not st and string.find(msg, gab))
end
checkro("y", "local x, y <const>, z = 10, 20, 30; x = 11; y = 12")
checkro("x", "local x <const>, y, z <const> = 10, 20, 30; x = 11")
checkro("z", "local x <const>, y, z <const> = 10, 20, 30; y = 10; z = 11")
checkro("z", [[
local a, z <const>, b = 10;
function foo() a = 20; z = 32; end
]])
checkro("var1", [[
local a, var1 <const> = 10;
function foo() a = 20; z = function () var1 = 12; end end
]])
end
print"testing to-be-closed variables"
local function stack(n) n = ((n == 0) or stack(n - 1)) end
local function func2close (f, x, y)
local obj = setmetatable({}, {__close = f})
if x then
return x, obj, y
else
return obj
end
end
do
local a = {}
do
local b <close> = false -- not to be closed
local x <close> = setmetatable({"x"}, {__close = function (self)
a[#a + 1] = self[1] end})
local w, y <close>, z = func2close(function (self, err)
assert(err == nil); a[#a + 1] = "y"
end, 10, 20)
local c <close> = nil -- not to be closed
a[#a + 1] = "in"
assert(w == 10 and z == 20)
end
a[#a + 1] = "out"
assert(a[1] == "in" and a[2] == "y" and a[3] == "x" and a[4] == "out")
end
do
local X = false
local x, closescope = func2close(function () stack(10); X = true end, 100)
assert(x == 100); x = 101; -- 'x' is not read-only
-- closing functions do not corrupt returning values
local function foo (x)
local _ <close> = closescope
return x, X, 23
end
local a, b, c = foo(1.5)
assert(a == 1.5 and b == false and c == 23 and X == true)
X = false
foo = function (x)
local _<close> = closescope
local y = 15
return y
end
assert(foo() == 15 and X == true)
X = false
foo = function ()
local x <close> = closescope
return x
end
assert(foo() == closescope and X == true)
end
-- testing to-be-closed x compile-time constants
-- (there were some bugs here in Lua 5.4-rc3, due to a confusion
-- between compile levels and stack levels of variables)
do
local flag = false
local x = setmetatable({},
{__close = function() assert(flag == false); flag = true end})
local y <const> = nil
local z <const> = nil
do
local a <close> = x
end
assert(flag) -- 'x' must be closed here
end
do
-- similar problem, but with implicit close in for loops
local flag = false
local x = setmetatable({},
{__close = function () assert(flag == false); flag = true end})
-- return an empty iterator, nil, nil, and 'x' to be closed
local function a ()
return (function () return nil end), nil, nil, x
end
local v <const> = 1
local w <const> = 1
local x <const> = 1
local y <const> = 1
local z <const> = 1
for k in a() do
a = k
end -- ending the loop must close 'x'
assert(flag) -- 'x' must be closed here
end
do
-- calls cannot be tail in the scope of to-be-closed variables
local X, Y
local function foo ()
local _ <close> = func2close(function () Y = 10 end)
assert(X == true and Y == nil) -- 'X' not closed yet
return 1,2,3
end
local function bar ()
local _ <close> = func2close(function () X = false end)
X = true
do
return foo() -- not a tail call!
end
end
local a, b, c, d = bar()
assert(a == 1 and b == 2 and c == 3 and X == false and Y == 10 and d == nil)
end
-- auxiliary functions for testing warnings in '__close'
local function prepwarn ()
if not T then -- no test library?
warn("@off") -- do not show (lots of) warnings
else
warn("@store") -- to test the warnings
end
end
local function endwarn ()
if not T then
warn("@on") -- back to normal
else
assert(_WARN == false)
warn("@normal")
end
end
local function checkwarn (msg)
if T then
assert(string.find(_WARN, msg))
_WARN = false -- reset variable to check next warning
end
end
warn("@on")
do print("testing errors in __close")
prepwarn()
-- original error is in __close
local function foo ()
local x <close> =
func2close(function (self, msg)
assert(string.find(msg, "@z"))
error("@x")
end)
local x1 <close> =
func2close(function (self, msg)
checkwarn("@y")
assert(string.find(msg, "@z"))
end)
local gc <close> = func2close(function () collectgarbage() end)
local y <close> =
func2close(function (self, msg)
assert(string.find(msg, "@z")) -- first error in 'z'
checkwarn("@z") -- second error in 'z' generated a warning
error("@y")
end)
local first = true
local z <close> =
-- 'z' close is called twice
func2close(function (self, msg)
if first then
assert(msg == nil)
first = false
else
assert(string.find(msg, "@z")) -- own error
end
error("@z")
end)
return 200
end
local stat, msg = pcall(foo, false)
assert(string.find(msg, "@z"))
checkwarn("@x")
-- original error not in __close
local function foo ()
local x <close> =
func2close(function (self, msg)
assert(msg == 4)
end)
local x1 <close> =
func2close(function (self, msg)
checkwarn("@y")
assert(msg == 4)
error("@x1")
end)
local gc <close> = func2close(function () collectgarbage() end)
local y <close> =
func2close(function (self, msg)
assert(msg == 4) -- error in body
checkwarn("@z")
error("@y")
end)
local first = true
local z <close> =
func2close(function (self, msg)
-- 'z' close is called once
assert(first and msg == 4)
first = false
error("@z")
end)
error(4) -- original error
end
local stat, msg = pcall(foo, true)
assert(msg == 4)
checkwarn("@x1") -- last error
-- error leaving a block
local function foo (...)
do
local x1 <close> =
func2close(function ()
checkwarn("@X")
error("@Y")
end)
local x123 <close> =
func2close(function ()
error("@X")
end)
end
os.exit(false) -- should not run
end
local st, msg = xpcall(foo, debug.traceback)
assert(string.match(msg, "^[^ ]* @X"))
assert(string.find(msg, "in metamethod 'close'"))
checkwarn("@Y")
-- error in toclose in vararg function
local function foo (...)
local x123 <close> = func2close(function () error("@x123") end)
end
local st, msg = xpcall(foo, debug.traceback)
assert(string.match(msg, "^[^ ]* @x123"))
assert(string.find(msg, "in metamethod 'close'"))
checkwarn("@x123") -- from second call to close 'x123'
endwarn()
end
do -- errors due to non-closable values
local function foo ()
local x <close> = {}
os.exit(false) -- should not run
end
local stat, msg = pcall(foo)
assert(not stat and
string.find(msg, "variable 'x' got a non%-closable value"))
local function foo ()
local xyz <close> = setmetatable({}, {__close = print})
getmetatable(xyz).__close = nil -- remove metamethod
end
local stat, msg = pcall(foo)
assert(not stat and
string.find(msg, "attempt to close non%-closable variable 'xyz'"))
end
if rawget(_G, "T") then
warn("@off")
-- memory error inside closing function
local function foo ()
local y <close> = func2close(function () T.alloccount() end)
local x <close> = setmetatable({}, {__close = function ()
T.alloccount(0); local x = {} -- force a memory error
end})
error(1000) -- common error inside the function's body
end
stack(5) -- ensure a minimal number of CI structures
-- despite memory error, 'y' will be executed and
-- memory limit will be lifted
local _, msg = pcall(foo)
assert(msg == 1000)
local close = func2close(function (self, msg)
T.alloccount()
assert(msg == "not enough memory")
end)
-- set a memory limit and return a closing object to remove the limit
local function enter (count)
stack(10) -- reserve some stack space
T.alloccount(count)
return close
end
local function test ()
local x <close> = enter(0) -- set a memory limit
-- creation of previous upvalue will raise a memory error
assert(false) -- should not run
end
local _, msg = pcall(test)
assert(msg == "not enough memory")
-- now use metamethod for closing
close = setmetatable({}, {__close = function ()
T.alloccount()
end})
-- repeat test with extra closing upvalues
local function test ()
local xxx <close> = func2close(function (self, msg)
assert(msg == "not enough memory");
error(1000) -- raise another error
end)
local xx <close> = func2close(function (self, msg)
assert(msg == "not enough memory");
end)
local x <close> = enter(0) -- set a memory limit
-- creation of previous upvalue will raise a memory error
os.exit(false) -- should not run
end
local _, msg = pcall(test)
assert(msg == "not enough memory") -- reported error is the first one
do -- testing 'toclose' in C string buffer
collectgarbage()
local s = string.rep('a', 10000) -- large string
local m = T.totalmem()
collectgarbage("stop")
s = string.upper(s) -- allocate buffer + new string (10K each)
-- ensure buffer was deallocated
assert(T.totalmem() - m <= 11000)
collectgarbage("restart")
end
do -- now some tests for freeing buffer in case of errors
local lim = 10000 -- some size larger than the static buffer
local extra = 2000 -- some extra memory (for callinfo, etc.)
local s = string.rep("a", lim)
-- concat this table needs two buffer resizes (one for each 's')
local a = {s, s}
collectgarbage()
m = T.totalmem()
collectgarbage("stop")
-- error in the first buffer allocation
T. totalmem(m + extra)
assert(not pcall(table.concat, a))
-- first buffer was not even allocated
assert(T.totalmem() - m <= extra)
-- error in the second buffer allocation
T. totalmem(m + lim + extra)
assert(not pcall(table.concat, a))
-- first buffer was released by 'toclose'
assert(T.totalmem() - m <= extra)
-- error in creation of final string
T.totalmem(m + 2 * lim + extra)
assert(not pcall(table.concat, a))
-- second buffer was released by 'toclose'
assert(T.totalmem() - m <= extra)
-- userdata, upvalue, buffer, buffer, final string
T.totalmem(m + 4*lim + extra)
assert(#table.concat(a) == 2*lim)
T.totalmem(0) -- remove memory limit
collectgarbage("restart")
print'+'
end
warn("@on")
end
print "to-be-closed variables in coroutines"
do
-- an error in a wrapped coroutine closes variables
local x = false
local y = false
local co = coroutine.wrap(function ()
local xv <close> = func2close(function () x = true end)
do
local yv <close> = func2close(function () y = true end)
coroutine.yield(100) -- yield doesn't close variable
end
coroutine.yield(200) -- yield doesn't close variable
error(23) -- error does
end)
local b = co()
assert(b == 100 and not x and not y)
b = co()
assert(b == 200 and not x and y)
local a, b = pcall(co)
assert(not a and b == 23 and x and y)
end
do
prepwarn()
-- error in a wrapped coroutine raising errors when closing a variable
local x = 0
local co = coroutine.wrap(function ()
local xx <close> = func2close(function () x = x + 1; error("@YYY") end)
local xv <close> = func2close(function () x = x + 1; error("@XXX") end)
coroutine.yield(100)
error(200)
end)
assert(co() == 100); assert(x == 0)
local st, msg = pcall(co); assert(x == 2)
assert(not st and msg == 200) -- should get first error raised
checkwarn("@YYY")
local x = 0
local y = 0
co = coroutine.wrap(function ()
local xx <close> = func2close(function () y = y + 1; error("YYY") end)
local xv <close> = func2close(function () x = x + 1; error("XXX") end)
coroutine.yield(100)
return 200
end)
assert(co() == 100); assert(x == 0)
local st, msg = pcall(co)
assert(x == 2 and y == 1) -- first close is called twice
-- should get first error raised
assert(not st and string.find(msg, "%w+%.%w+:%d+: XXX"))
checkwarn("YYY")
endwarn()
end
-- a suspended coroutine should not close its variables when collected
local co
co = coroutine.wrap(function()
-- should not run
local x <close> = func2close(function () os.exit(false) end)
co = nil
coroutine.yield()
end)
co() -- start coroutine
assert(co == nil) -- eventually it will be collected
collectgarbage()
-- to-be-closed variables in generic for loops
do
local numopen = 0
local function open (x)
numopen = numopen + 1
return
function () -- iteraction function
x = x - 1
if x > 0 then return x end
end,
nil, -- state
nil, -- control variable
func2close(function () numopen = numopen - 1 end) -- closing function
end
local s = 0
for i in open(10) do
s = s + i
end
assert(s == 45 and numopen == 0)
local s = 0
for i in open(10) do
if i < 5 then break end
s = s + i
end
assert(s == 35 and numopen == 0)
local s = 0
for i in open(10) do
for j in open(10) do
if i + j < 5 then goto endloop end
s = s + i
end
end
::endloop::
assert(s == 375 and numopen == 0)
end
print('OK')
return 5,f
end -- }
|