{{ message }}
Repository navigation
Expand file tree
/
Copy pathgc.lua
More file actions
752 lines (633 loc) · 19.2 KB
/
Copy pathgc.lua
File metadata and controls
752 lines (633 loc) · 19.2 KB
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
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
-- $Id: testes/gc.lua $
-- See Copyright Notice in file lua.h
print('testing incremental garbage collection')
local debug = require"debug"
assert(collectgarbage("isrunning"))
collectgarbage()
local oldmode = collectgarbage("incremental")
-- changing modes should return previous mode
assert(collectgarbage("generational") == "incremental")
assert(collectgarbage("generational") == "generational")
assert(collectgarbage("incremental") == "generational")
assert(collectgarbage("incremental") == "incremental")
local function nop () end
local function gcinfo ()
return collectgarbage"count" * 1024
end
-- test weird parameters to 'collectgarbage'
do
collectgarbage("incremental")
local opause = collectgarbage("param", "pause", 100)
local ostepmul = collectgarbage("param", "stepmul", 100)
assert(collectgarbage("param", "pause") == 100)
assert(collectgarbage("param", "stepmul") == 100)
local t = {0, 2, 10, 90, 500, 5000, 30000, 0x7ffffffe}
for i = 1, #t do
collectgarbage("param", "pause", t[i])
for j = 1, #t do
collectgarbage("param", "stepmul", t[j])
collectgarbage("step", t[j])
end
end
-- restore original parameters
collectgarbage("param", "pause", opause)
collectgarbage("param", "stepmul", ostepmul)
collectgarbage()
end
--
-- test the "size" of basic GC steps (whatever they mean...)
--
do print("steps")
local function dosteps (siz)
collectgarbage()
local a = {}
for i=1,100 do a[i] = {{}}; local b = {} end
local x = gcinfo()
local i = 0
repeat -- do steps until it completes a collection cycle
i = i+1
until collectgarbage("step", siz)
assert(gcinfo() < x)
return i -- number of steps
end
if not _port then
collectgarbage"stop"
assert(dosteps(10) < dosteps(2))
collectgarbage"restart"
end
end
_G["while"] = 234
--
-- tests for GC activation when creating different kinds of objects
--
local function GC1 ()
local u
local b -- (above 'u' it in the stack)
local finish = false
u = setmetatable({}, {__gc = function () finish = true end})
b = {34}
repeat u = {} until finish
assert(b[1] == 34) -- 'u' was collected, but 'b' was not
finish = false; local i = 1
u = setmetatable({}, {__gc = function () finish = true end})
repeat i = i + 1; u = tostring(i) .. tostring(i) until finish
assert(b[1] == 34) -- 'u' was collected, but 'b' was not
finish = false
u = setmetatable({}, {__gc = function () finish = true end})
repeat local i; u = function () return i end until finish
assert(b[1] == 34) -- 'u' was collected, but 'b' was not
end
local function GC2 ()
local u
local finish = false
u = {setmetatable({}, {__gc = function () finish = true end})}
local b = {34}
repeat u = {{}} until finish
assert(b[1] == 34) -- 'u' was collected, but 'b' was not
finish = false; local i = 1
u = {setmetatable({}, {__gc = function () finish = true end})}
repeat i = i + 1; u = {tostring(i) .. tostring(i)} until finish
assert(b[1] == 34) -- 'u' was collected, but 'b' was not
finish = false
u = {setmetatable({}, {__gc = function () finish = true end})}
repeat local i; u = {function () return i end} until finish
assert(b[1] == 34) -- 'u' was collected, but 'b' was not
end
local function GC() GC1(); GC2() end
do
print("creating many objects")
local limit = 5000
for i = 1, limit do
local a = {}; a = nil
end
local a = "a"
for i = 1, limit do
a = i .. "b";
a = string.gsub(a, '(%d%d*)', "%1 %1")
a = "a"
end
a = {}
function a:test ()
for i = 1, limit do
load(string.format("function temp(a) return 'a%d' end", i), "")()
assert(temp() == string.format('a%d', i))
end
end
a:test()
_G.temp = nil
end
-- collection of functions without locals, globals, etc.
do local f = function () end end
print("functions with errors")
local prog = [[
do
a = 10;
function foo(x,y)
a = sin(a+0.456-0.23e-12);
return function (z) return sin(%x+z) end
end
local x = function (w) a=a+w; end
end
]]
do
local step = 1
if _soft then step = 13 end
for i=1, string.len(prog), step do
for j=i, string.len(prog), step do
pcall(load(string.sub(prog, i, j), ""))
end
end
end
rawset(_G, "a", nil)
_G.x = nil
do
foo = nil
print('long strings')
local x = "01234567890123456789012345678901234567890123456789012345678901234567890123456789"
assert(string.len(x)==80)
local s = ''
local k = math.min(300, (math.maxinteger // 80) // 2)
for n = 1, k do s = s..x; local j=tostring(n) end
assert(string.len(s) == k*80)
s = string.sub(s, 1, 10000)
local s, i = string.gsub(s, '(%d%d%d%d)', '')
assert(i==10000 // 4)
assert(_G["while"] == 234)
_G["while"] = nil
end
if not _port then
-- test the pace of the collector
collectgarbage(); collectgarbage()
local x = gcinfo()
collectgarbage"stop"
repeat
local a = {}
until gcinfo() > 3 * x
collectgarbage"restart"
assert(collectgarbage("isrunning"))
repeat
local a = {}
until gcinfo() <= x * 2
end
print("clearing tables")
local lim = 15
local a = {}
-- fill a with `collectable' indices
for i=1,lim do a[{}] = i end
b = {}
for k,v in pairs(a) do b[k]=v end
-- remove all indices and collect them
for n in pairs(b) do
a[n] = undef
assert(type(n) == 'table' and next(n) == nil)
collectgarbage()
end
b = nil
collectgarbage()
for n in pairs(a) do error'cannot be here' end
for i=1,lim do a[i] = i end
for i=1,lim do assert(a[i] == i) end
print('weak tables')
a = {}; setmetatable(a, {__mode = 'k'});
-- fill a with some `collectable' indices
for i=1,lim do a[{}] = i end
-- and some non-collectable ones
for i=1,lim do a[i] = i end
for i=1,lim do local s=string.rep('@', i); a[s] = s..'#' end
collectgarbage()
local i = 0
for k,v in pairs(a) do assert(k==v or k..'#'==v); i=i+1 end
assert(i == 2*lim)
a = {}; setmetatable(a, {__mode = 'v'});
a[1] = string.rep('b', 21)
collectgarbage()
assert(a[1]) -- strings are *values*
a[1] = undef
-- fill a with some `collectable' values (in both parts of the table)
for i=1,lim do a[i] = {} end
for i=1,lim do a[i..'x'] = {} end
-- and some non-collectable ones
for i=1,lim do local t={}; a[t]=t end
for i=1,lim do a[i+lim]=i..'x' end
collectgarbage()
local i = 0
for k,v in pairs(a) do assert(k==v or k-lim..'x' == v); i=i+1 end
assert(i == 2*lim)
a = {}; setmetatable(a, {__mode = 'kv'});
local x, y, z = {}, {}, {}
-- keep only some items
a[1], a[2], a[3] = x, y, z
a[string.rep('$', 11)] = string.rep('$', 11)
-- fill a with some `collectable' values
for i=4,lim do a[i] = {} end
for i=1,lim do a[{}] = i end
for i=1,lim do local t={}; a[t]=t end
collectgarbage()
assert(next(a) ~= nil)
local i = 0
for k,v in pairs(a) do
assert((k == 1 and v == x) or
(k == 2 and v == y) or
(k == 3 and v == z) or k==v);
i = i+1
end
assert(i == 4)
x,y,z=nil
collectgarbage()
assert(next(a) == string.rep('$', 11))
do -- invalid mode
local a = setmetatable({}, {__mode = 34})
collectgarbage()
end
if T then -- bug since 5.3: all-weak tables are not being revisited
T.gcstate("propagate")
local t = setmetatable({}, {__mode = "kv"})
T.gcstate("enteratomic") -- 't' was visited
setmetatable(t, {__mode = "kv"})
T.gcstate("pause") -- its new metatable is not being visited
assert(getmetatable(t).__mode == "kv")
end
-- 'bug' in 5.1
a = {}
local t = {x = 10}
local C = setmetatable({key = t}, {__mode = 'v'})
local C1 = setmetatable({[t] = 1}, {__mode = 'k'})
a.x = t -- this should not prevent 't' from being removed from
-- weak table 'C' by the time 'a' is finalized
setmetatable(a, {__gc = function (u)
assert(C.key == nil)
assert(type(next(C1)) == 'table')
end})
a, t = nil
collectgarbage()
collectgarbage()
assert(next(C) == nil and next(C1) == nil)
C, C1 = nil
-- ephemerons
local mt = {__mode = 'k'}
a = {{10},{20},{30},{40}}; setmetatable(a, mt)
x = nil
for i = 1, 100 do local n = {}; a[n] = {k = {x}}; x = n end
GC()
local n = x
local i = 0
while n do n = a[n].k[1]; i = i + 1 end
assert(i == 100)
x = nil
GC()
for i = 1, 4 do assert(a[i][1] == i * 10); a[i] = undef end
assert(next(a) == nil)
local K = {}
a[K] = {}
for i=1,10 do a[K][i] = {}; a[a[K][i]] = setmetatable({}, mt) end
x = nil
local k = 1
for j = 1,100 do
local n = {}; local nk = k%10 + 1
a[a[K][nk]][n] = {x, k = k}; x = n; k = nk
end
GC()
local n = x
local i = 0
while n do local t = a[a[K][k]][n]; n = t[1]; k = t.k; i = i + 1 end
assert(i == 100)
K = nil
GC()
-- assert(next(a) == nil)
-- testing errors during GC
if T then
collectgarbage("stop") -- stop collection
local u = {}
local s = {}; setmetatable(s, {__mode = 'k'})
setmetatable(u, {__gc = function (o)
local i = s[o]
s[i] = true
assert(not s[i - 1]) -- check proper finalization order
if i == 8 then error("@expected@") end -- error during GC
end})
for i = 6, 10 do
local n = setmetatable({}, getmetatable(u))
s[n] = i
end
warn("@on"); warn("@store")
collectgarbage()
assert(string.find(_WARN, "error in __gc"))
assert(string.match(_WARN, "@(.-)@") == "expected"); _WARN = false
for i = 8, 10 do assert(s[i]) end
for i = 1, 5 do
local n = setmetatable({}, getmetatable(u))
s[n] = i
end
collectgarbage()
for i = 1, 10 do assert(s[i]) end
getmetatable(u).__gc = nil
warn("@normal")
end
print '+'
-- testing userdata
if T==nil then
(Message or print)('\n >>> testC not active: skipping userdata GC tests <<<\n')
else
local function newproxy(u)
return debug.setmetatable(T.newuserdata(0), debug.getmetatable(u))
end
collectgarbage("stop") -- stop collection
local u = newproxy(nil)
debug.setmetatable(u, {__gc = true})
local s = 0
local a = {[u] = 0}; setmetatable(a, {__mode = 'vk'})
for i=1,10 do a[newproxy(u)] = i end
for k in pairs(a) do assert(getmetatable(k) == getmetatable(u)) end
local a1 = {}; for k,v in pairs(a) do a1[k] = v end
for k,v in pairs(a1) do a[v] = k end
for i =1,10 do assert(a[i]) end
getmetatable(u).a = a1
getmetatable(u).u = u
do
local u = u
getmetatable(u).__gc = function (o)
assert(a[o] == 10-s)
assert(a[10-s] == undef) -- udata already removed from weak table
assert(getmetatable(o) == getmetatable(u))
assert(getmetatable(o).a[o] == 10-s)
s=s+1
end
end
a1, u = nil
assert(next(a) ~= nil)
collectgarbage()
assert(s==11)
collectgarbage()
assert(next(a) == nil) -- finalized keys are removed in two cycles
end
-- __gc x weak tables
local u = setmetatable({}, {__gc = true})
-- __gc metamethod should be collected before running
setmetatable(getmetatable(u), {__mode = "v"})
getmetatable(u).__gc = function (o) os.exit(1) end -- cannot happen
u = nil
collectgarbage()
local u = setmetatable({}, {__gc = true})
local m = getmetatable(u)
m.x = {[{0}] = 1; [0] = {1}}; setmetatable(m.x, {__mode = "kv"});
m.__gc = function (o)
assert(next(getmetatable(o).x) == nil)
m = 10
end
u, m = nil
collectgarbage()
assert(m==10)
do -- tests for string keys in weak tables
collectgarbage(); collectgarbage()
local m = collectgarbage("count") -- current memory
local a = setmetatable({}, {__mode = "kv"})
a[string.rep("a", 2^22)] = 25 -- long string key -> number value
a[string.rep("b", 2^22)] = {} -- long string key -> collectable value
a[{}] = 14 -- collectable key
collectgarbage()
local k, v = next(a) -- string key with number value preserved
assert(k == string.rep("a", 2^22) and v == 25)
assert(next(a, k) == nil) -- everything else cleared
assert(a[string.rep("b", 2^22)] == undef)
a[k] = undef -- erase this last entry
k = nil
collectgarbage()
assert(next(a) == nil)
-- make sure will not try to compare with dead key
assert(a[string.rep("b", 100)] == undef)
assert(collectgarbage("count") <= m + 1) -- everything collected
end
-- errors during collection
if T then
warn("@store")
u = setmetatable({}, {__gc = function () error "@expected error" end})
u = nil
collectgarbage()
assert(string.find(_WARN, "@expected error")); _WARN = false
warn("@normal")
end
if not _soft then
print("long list")
local a = {}
for i = 1,200000 do
a = {next = a}
end
a = nil
collectgarbage()
end
-- create many threads with self-references and open upvalues
print("self-referenced threads")
local thread_id = 0
local threads = {}
local function fn (thread)
local x = {}
threads[thread_id] = function()
thread = x
end
coroutine.yield()
end
while thread_id < 1000 do
local thread = coroutine.create(fn)
coroutine.resume(thread, thread)
thread_id = thread_id + 1
end
-- Create a closure (function inside 'f') with an upvalue ('param') that
-- points (through a table) to the closure itself and to the thread
-- ('co' and the initial value of 'param') where closure is running.
-- Then, assert that table (and therefore everything else) will be
-- collected.
do
local collected = false -- to detect collection
collectgarbage(); collectgarbage("stop")
do
local function f (param)
;(function ()
assert(type(f) == 'function' and type(param) == 'thread')
param = {param, f}
setmetatable(param, {__gc = function () collected = true end})
coroutine.yield(100)
end)()
end
local co = coroutine.create(f)
assert(coroutine.resume(co, co))
end
-- Now, thread and closure are not reachable any more.
collectgarbage()
assert(collected)
collectgarbage("restart")
end
do
collectgarbage()
collectgarbage"stop"
collectgarbage("step") -- steps should not unblock the collector
local x = gcinfo()
repeat
for i=1,1000 do _ENV.a = {} end -- no collection during the loop
until gcinfo() > 2 * x
collectgarbage"restart"
_ENV.a = nil
end
if T then -- tests for weird cases collecting upvalues
local function foo ()
local a = {x = 20}
coroutine.yield(function () return a.x end) -- will run collector
assert(a.x == 20) -- 'a' is 'ok'
a = {x = 30} -- create a new object
assert(T.gccolor(a) == "white") -- of course it is new...
coroutine.yield(100) -- 'a' is still local to this thread
end
local t = setmetatable({}, {__mode = "kv"})
collectgarbage(); collectgarbage('stop')
-- create coroutine in a weak table, so it will never be marked
t.co = coroutine.wrap(foo)
local f = t.co() -- create function to access local 'a'
T.gcstate("enteratomic") -- ensure all objects are traversed
assert(T.gcstate() == "enteratomic")
assert(t.co() == 100) -- resume coroutine, creating new table for 'a'
assert(T.gccolor(t.co) == "white") -- thread was not traversed
T.gcstate("pause") -- collect thread, but should mark 'a' before that
assert(t.co == nil and f() == 30) -- ensure correct access to 'a'
collectgarbage("restart")
-- test barrier in sweep phase (backing userdata to gray)
local u = T.newuserdata(0, 1) -- create a userdata
collectgarbage()
collectgarbage"stop"
local a = {} -- avoid 'u' as first element in 'allgc'
T.gcstate"enteratomic"
T.gcstate"sweepallgc"
local x = {}
assert(T.gccolor(u) == "black") -- userdata is "old" (black)
assert(T.gccolor(x) == "white") -- table is "new" (white)
debug.setuservalue(u, x) -- trigger barrier
assert(T.gccolor(u) == "gray") -- userdata changed back to gray
collectgarbage"restart"
print"+"
end
if T then
local debug = require "debug"
collectgarbage("stop")
local x = T.newuserdata(0)
local y = T.newuserdata(0)
debug.setmetatable(y, {__gc = nop}) -- bless the new udata before...
debug.setmetatable(x, {__gc = nop}) -- ...the old one
assert(T.gccolor(y) == "white")
T.checkmemory()
collectgarbage("restart")
end
if T then
collectgarbage("stop")
T.gcstate("pause")
local sup = {x = 0}
local a = setmetatable({}, {__newindex = sup})
T.gcstate("enteratomic")
assert(T.gccolor(sup) == "black")
a.x = {} -- should not break the invariant
assert(not (T.gccolor(sup) == "black" and T.gccolor(sup.x) == "white"))
T.gcstate("pause") -- complete the GC cycle
sup.x.y = 10
collectgarbage("restart")
end
if T then
print("emergency collections")
collectgarbage()
collectgarbage()
T.totalmem(T.totalmem() + 200)
for i=1,200 do local a = {} end
T.totalmem(0)
collectgarbage()
local t = T.totalmem("table")
local a = {{}, {}, {}} -- create 4 new tables
assert(T.totalmem("table") == t + 4)
t = T.totalmem("function")
a = function () end -- create 1 new closure
assert(T.totalmem("function") == t + 1)
t = T.totalmem("thread")
a = coroutine.create(function () end) -- create 1 new coroutine
assert(T.totalmem("thread") == t + 1)
end
-- create an object to be collected when state is closed
do
local setmetatable,assert,type,print,getmetatable =
setmetatable,assert,type,print,getmetatable
local tt = {}
tt.__gc = function (o)
assert(getmetatable(o) == tt)
-- create new objects during GC
local a = 'xuxu'..(10+3)..'joao', {}
___Glob = o -- resurrect object!
setmetatable({}, tt) -- creates a new one with same metatable
print(">>> closing state " .. "<<<\n")
end
local u = setmetatable({}, tt)
___Glob = {u} -- avoid object being collected before program end
end
-- create several objects to raise errors when collected while closing state
if T then
local error, assert, find, warn = error, assert, string.find, warn
local n = 0
local lastmsg
local mt = {__gc = function (o)
n = n + 1
assert(n == o[1])
if n == 1 then
_WARN = false
elseif n == 2 then
assert(find(_WARN, "@expected warning"))
lastmsg = _WARN -- get message from previous error (first 'o')
else
assert(lastmsg == _WARN) -- subsequent error messages are equal
end
warn("@store"); _WARN = false
error"@expected warning"
end}
for i = 10, 1, -1 do
-- create object and preserve it until the end
table.insert(___Glob, setmetatable({i}, mt))
end
end
-- just to make sure
assert(collectgarbage'isrunning')
do -- check that the collector is not reentrant in incremental mode
local res = true
setmetatable({}, {__gc = function ()
res = collectgarbage()
end})
collectgarbage()
assert(not res)
end
collectgarbage(oldmode)
if T then
print("testing stack issues when calling finalizers")
local X
local obj
local function initobj ()
X = false
obj = setmetatable({}, {__gc = function () X = true end})
end
local function loop (n)
if n > 0 then loop(n - 1) end
end
-- should not try to call finalizer without a CallInfo available
initobj()
loop(20) -- ensure stack space
T.resetCI() -- remove extra CallInfos
T.alloccount(0) -- cannot allocate more CallInfos
obj = nil
collectgarbage() -- will not call finalizer
T.alloccount()
assert(X == false)
collectgarbage() -- now will call finalizer (it was still pending)
assert(X == true)
-- should not try to call finalizer without stack space available
initobj()
loop(5) -- ensure enough CallInfos
T.reallocstack(0) -- remove extra stack slots
T.alloccount(0) -- cannot reallocate stack
obj = nil
collectgarbage() -- will not call finalizer
T.alloccount()
assert(X == false)
collectgarbage() -- now will call finalizer (it was still pending)
assert(X == true)
end
print('OK')
You can’t perform that action at this time.