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
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
|
/**********************************************************************
mjit.c - Infrastructure for MRI method JIT compiler
Copyright (C) 2017 Vladimir Makarov <vmakarov@redhat.com>.
**********************************************************************/
/* We utilize widely used C compilers (GCC and LLVM Clang) to
implement MJIT. We feed them a C code generated from ISEQ. The
industrial C compilers are slower than regular JIT engines.
Generated code performance of the used C compilers has a higher
priority over the compilation speed.
So our major goal is to minimize the ISEQ compilation time when we
use widely optimization level (-O2). It is achieved by
o Using a precompiled version of the header
o Keeping all files in `/tmp`. On modern Linux `/tmp` is a file
system in memory. So it is pretty fast
o Implementing MJIT as a multi-threaded code because we want to
compile ISEQs in parallel with iseq execution to speed up Ruby
code execution. MJIT has one thread (*worker*) to do
parallel compilations:
o It prepares a precompiled code of the minimized header.
It starts at the MRI execution start
o It generates PIC object files of ISEQs
o It takes one JIT unit from a priority queue unless it is empty.
o It translates the JIT unit ISEQ into C-code using the precompiled
header, calls CC and load PIC code when it is ready
o Currently MJIT put ISEQ in the queue when ISEQ is called
o MJIT can reorder ISEQs in the queue if some ISEQ has been called
many times and its compilation did not start yet
o MRI reuses the machine code if it already exists for ISEQ
o The machine code we generate can stop and switch to the ISEQ
interpretation if some condition is not satisfied as the machine
code can be speculative or some exception raises
o Speculative machine code can be canceled.
Here is a diagram showing the MJIT organization:
_______
|header |
|_______|
| MRI building
--------------|----------------------------------------
| MRI execution
|
_____________|_____
| | |
| ___V__ | CC ____________________
| | |----------->| precompiled header |
| | | | |____________________|
| | | | |
| | MJIT | | |
| | | | |
| | | | ____V___ CC __________
| |______|----------->| C code |--->| .so file |
| | |________| |__________|
| | |
| | |
| MRI machine code |<-----------------------------
|___________________| loading
We don't use SIGCHLD signal and WNOHANG waitpid in MJIT as it
might mess with ruby code dealing with signals. Also as SIGCHLD
signal can be delivered to non-main thread, the stack might have a
constraint. So the correct version of code based on SIGCHLD and
WNOHANG waitpid would be very complicated. */
#ifdef __sun
#define __EXTENSIONS__ 1
#endif
#include "internal.h"
#include "vm_core.h"
#include "mjit.h"
#include "gc.h"
#include "constant.h"
#include "id_table.h"
#include "ruby_assert.h"
#include "ruby/util.h"
#include "ruby/version.h"
#ifdef _WIN32
#include <winsock2.h>
#include <windows.h>
#else
#include <sys/wait.h>
#include <sys/time.h>
#include <dlfcn.h>
#endif
#include <errno.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
extern void rb_native_mutex_lock(rb_nativethread_lock_t *lock);
extern void rb_native_mutex_unlock(rb_nativethread_lock_t *lock);
extern void rb_native_mutex_initialize(rb_nativethread_lock_t *lock);
extern void rb_native_mutex_destroy(rb_nativethread_lock_t *lock);
extern void rb_native_cond_initialize(rb_nativethread_cond_t *cond, int flags);
extern void rb_native_cond_destroy(rb_nativethread_cond_t *cond);
extern void rb_native_cond_signal(rb_nativethread_cond_t *cond);
extern void rb_native_cond_broadcast(rb_nativethread_cond_t *cond);
extern void rb_native_cond_wait(rb_nativethread_cond_t *cond, rb_nativethread_lock_t *mutex);
extern int rb_thread_create_mjit_thread(void (*child_hook)(void), void (*worker_func)(void));
#define RB_CONDATTR_CLOCK_MONOTONIC 1
#ifdef _WIN32
#define dlopen(name,flag) ((void*)LoadLibrary(name))
#define dlerror() strerror(rb_w32_map_errno(GetLastError()))
#define dlsym(handle,name) ((void*)GetProcAddress((handle),(name)))
#define dlclose(handle) (CloseHandle(handle))
#define RTLD_NOW -1
#define waitpid(pid,stat_loc,options) (WaitForSingleObject((HANDLE)(pid), INFINITE), GetExitCodeProcess((HANDLE)(pid), (LPDWORD)(stat_loc)))
#define WIFEXITED(S) ((S) != STILL_ACTIVE)
#define WEXITSTATUS(S) (S)
#define WIFSIGNALED(S) (0)
typedef intptr_t pid_t;
#endif
/* Atomically set function pointer if possible. */
#ifdef _WIN32
# ifdef InterlockedExchangePointer
# define MJIT_ATOMIC_SET(var, val) InterlockedExchangePointer((void **)&(var), (void *)val)
# else
# define MJIT_ATOMIC_SET(var, val) (void)((var) = (val))
# endif
#else
# define MJIT_ATOMIC_SET(var, val) ATOMIC_SET(var, val)
#endif
/* A copy of MJIT portion of MRI options since MJIT initialization. We
need them as MJIT threads still can work when the most MRI data were
freed. */
struct mjit_options mjit_opts;
/* The unit structure that holds metadata of ISeq for MJIT. */
struct rb_mjit_unit {
/* Unique order number of unit. */
int id;
/* Dlopen handle of the loaded object file. */
void *handle;
const rb_iseq_t *iseq;
/* Only used by unload_units. Flag to check this unit is currently on stack or not. */
char used_code_p;
};
/* Node of linked list in struct rb_mjit_unit_list.
TODO: use ccan/list for this */
struct rb_mjit_unit_node {
struct rb_mjit_unit *unit;
struct rb_mjit_unit_node *next, *prev;
};
/* Linked list of struct rb_mjit_unit. */
struct rb_mjit_unit_list {
struct rb_mjit_unit_node *head;
int length; /* the list length */
};
/* TRUE if MJIT is initialized and will be used. */
int mjit_init_p = FALSE;
/* Priority queue of iseqs waiting for JIT compilation.
This variable is a pointer to head unit of the queue. */
static struct rb_mjit_unit_list unit_queue;
/* List of units which are successfully compiled. */
static struct rb_mjit_unit_list active_units;
/* The number of so far processed ISEQs, used to generate unique id. */
static int current_unit_num;
/* A mutex for conitionals and critical sections. */
static rb_nativethread_lock_t mjit_engine_mutex;
/* A thread conditional to wake up `mjit_finish` at the end of PCH thread. */
static rb_nativethread_cond_t mjit_pch_wakeup;
/* A thread conditional to wake up the client if there is a change in
executed unit status. */
static rb_nativethread_cond_t mjit_client_wakeup;
/* A thread conditional to wake up a worker if there we have something
to add or we need to stop MJIT engine. */
static rb_nativethread_cond_t mjit_worker_wakeup;
/* A thread conditional to wake up workers if at the end of GC. */
static rb_nativethread_cond_t mjit_gc_wakeup;
/* True when GC is working. */
static int in_gc;
/* True when JIT is working. */
static int in_jit;
/* Defined in the client thread before starting MJIT threads: */
/* Used C compiler path. */
static const char *cc_path;
/* Name of the header file. */
static char *header_file;
/* Name of the precompiled header file. */
static char *pch_file;
/* Path of "/tmp", which can be changed to $TMP in MinGW. */
static char *tmp_dir;
/* Hash like { 1 => true, 2 => true, ... } whose keys are valid `class_serial`s.
This is used to invalidate obsoleted CALL_CACHE. */
static VALUE valid_class_serials;
/* Ruby level interface module. */
VALUE rb_mMJIT;
#ifdef _WIN32
/* Linker option to enable libruby in the build directory. */
static char *libruby_build;
/* Linker option to enable libruby in the directory after install. */
static char *libruby_installed;
#endif
/* Return time in milliseconds as a double. */
static double
real_ms_time(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_usec / 1000.0 + tv.tv_sec * 1000.0;
}
/* Make and return copy of STR in the heap. */
#define get_string ruby_strdup
static int
sprint_uniq_filename(char *str, size_t size, unsigned long id, const char *prefix, const char *suffix)
{
return snprintf(str, size, "%s/%sp%luu%lu%s", tmp_dir, prefix, (unsigned long) getpid(), id, suffix);
}
/* Return an unique file name in /tmp with PREFIX and SUFFIX and
number ID. Use getpid if ID == 0. The return file name exists
until the next function call. */
static char *
get_uniq_filename(unsigned long id, const char *prefix, const char *suffix)
{
char buff[70], *str = buff;
int size = sprint_uniq_filename(buff, sizeof(buff), id, prefix, suffix);
str = 0;
++size;
str = xmalloc(size);
if (size <= (int)sizeof(buff)) {
memcpy(str, buff, size);
}
else {
sprint_uniq_filename(str, size, id, prefix, suffix);
}
return str;
}
/* Print the arguments according to FORMAT to stderr only if MJIT
verbose option value is more or equal to LEVEL. */
PRINTF_ARGS(static void, 2, 3)
verbose(int level, const char *format, ...)
{
va_list args;
va_start(args, format);
if (mjit_opts.verbose >= level)
vfprintf(stderr, format, args);
va_end(args);
if (mjit_opts.verbose >= level)
fprintf(stderr, "\n");
}
/* Return length of NULL-terminated array ARGS excluding the NULL
marker. */
static size_t
args_len(char *const *args)
{
size_t i;
for (i = 0; (args[i]) != NULL;i++)
;
return i;
}
/* Concatenate NUM passed NULL-terminated arrays of strings, put the
result (with NULL end marker) into the heap, and return the
result. */
static char **
form_args(int num, ...)
{
va_list argp;
size_t len, n;
int i;
char **args, **res;
va_start(argp, num);
res = NULL;
for (i = len = 0; i < num; i++) {
args = va_arg(argp, char **);
n = args_len(args);
REALLOC_N(res, char *, len + n + 1);
MEMCPY(res + len, args, char *, n + 1);
len += n;
}
va_end(argp);
return res;
}
/* Start an OS process of executable PATH with arguments ARGV. Return
PID of the process.
TODO: Use the same function in process.c */
static pid_t
start_process(const char *path, char *const *argv)
{
pid_t pid;
if (mjit_opts.verbose >= 2) {
int i;
const char *arg;
fprintf(stderr, "Starting process: %s", path);
for (i = 0; (arg = argv[i]) != NULL; i++)
fprintf(stderr, " %s", arg);
fprintf(stderr, "\n");
}
#ifdef _WIN32
pid = spawnvp(_P_NOWAIT, path, argv);
#else
{
/* Not calling IO functions between fork and exec for safety */
int dev_null = rb_cloexec_open(ruby_null_device, O_WRONLY, 0);
if ((pid = vfork()) == 0) {
umask(0077);
if (mjit_opts.verbose == 0) {
/* CC can be started in a thread using a file which has been
already removed while MJIT is finishing. Discard the
messages about missing files. */
dup2(dev_null, STDERR_FILENO);
dup2(dev_null, STDOUT_FILENO);
}
(void)close(dev_null);
pid = execvp(path, argv); /* Pid will be negative on an error */
/* Even if we successfully found CC to compile PCH we still can
fail with loading the CC in very rare cases for some reasons.
Stop the forked process in this case. */
verbose(1, "MJIT: Error in execvp: %s\n", path);
_exit(1);
}
(void)close(dev_null);
}
#endif
return pid;
}
/* Execute an OS process of executable PATH with arguments ARGV.
Return -1 or -2 if failed to execute, otherwise exit code of the process.
TODO: Use the same function in process.c */
static int
exec_process(const char *path, char *const argv[])
{
int stat, exit_code;
pid_t pid;
pid = start_process(path, argv);
if (pid <= 0)
return -2;
for (;;) {
waitpid(pid, &stat, 0);
if (WIFEXITED(stat)) {
exit_code = WEXITSTATUS(stat);
break;
} else if (WIFSIGNALED(stat)) {
exit_code = -1;
break;
}
}
return exit_code;
}
/* Start a critical section. Use message MSG to print debug info at
LEVEL. */
static inline void
CRITICAL_SECTION_START(int level, const char *msg)
{
verbose(level, "Locking %s", msg);
rb_native_mutex_lock(&mjit_engine_mutex);
verbose(level, "Locked %s", msg);
}
/* Finish the current critical section. Use message MSG to print
debug info at LEVEL. */
static inline void
CRITICAL_SECTION_FINISH(int level, const char *msg)
{
verbose(level, "Unlocked %s", msg);
rb_native_mutex_unlock(&mjit_engine_mutex);
}
/* Wait until workers don't compile any iseq. It is called at the
start of GC. */
void
mjit_gc_start_hook(void)
{
if (!mjit_init_p)
return;
CRITICAL_SECTION_START(4, "mjit_gc_start_hook");
while (in_jit) {
verbose(4, "Waiting wakeup from a worker for GC");
rb_native_cond_wait(&mjit_client_wakeup, &mjit_engine_mutex);
verbose(4, "Getting wakeup from a worker for GC");
}
in_gc = TRUE;
CRITICAL_SECTION_FINISH(4, "mjit_gc_start_hook");
}
/* Send a signal to workers to continue iseq compilations. It is
called at the end of GC. */
void
mjit_gc_finish_hook(void)
{
if (!mjit_init_p)
return;
CRITICAL_SECTION_START(4, "mjit_gc_finish_hook");
in_gc = FALSE;
verbose(4, "Sending wakeup signal to workers after GC");
rb_native_cond_broadcast(&mjit_gc_wakeup);
CRITICAL_SECTION_FINISH(4, "mjit_gc_finish_hook");
}
/* Iseqs can be garbage collected. This function should call when it
happens. It removes iseq from the unit. */
void
mjit_free_iseq(const rb_iseq_t *iseq)
{
if (!mjit_init_p)
return;
CRITICAL_SECTION_START(4, "mjit_free_iseq");
if (iseq->body->jit_unit) {
/* jit_unit is not freed here because it may be referred by multiple
lists of units. `get_from_list` and `mjit_finish` do the job. */
iseq->body->jit_unit->iseq = NULL;
}
CRITICAL_SECTION_FINISH(4, "mjit_free_iseq");
}
static void
free_unit(struct rb_mjit_unit *unit)
{
if (unit->iseq) /* ISeq is not GCed */
unit->iseq->body->jit_func = 0;
if (unit->handle) /* handle is NULL if it's in queue */
dlclose(unit->handle);
xfree(unit);
}
static void
init_list(struct rb_mjit_unit_list *list)
{
list->head = NULL;
list->length = 0;
}
/* Allocate struct rb_mjit_unit_node and return it. This MUST NOT be
called inside critical section because that causes deadlock. ZALLOC
may fire GC and GC hooks mjit_gc_start_hook that starts critical section. */
static struct rb_mjit_unit_node *
create_list_node(struct rb_mjit_unit *unit)
{
struct rb_mjit_unit_node *node = ZALLOC(struct rb_mjit_unit_node);
node->unit = unit;
return node;
}
/* Add unit node to the tail of doubly linked LIST. It should be not in
the list before. */
static void
add_to_list(struct rb_mjit_unit_node *node, struct rb_mjit_unit_list *list)
{
/* Append iseq to list */
if (list->head == NULL) {
list->head = node;
}
else {
struct rb_mjit_unit_node *tail = list->head;
while (tail->next != NULL) {
tail = tail->next;
}
tail->next = node;
node->prev = tail;
}
list->length++;
}
static void
remove_from_list(struct rb_mjit_unit_node *node, struct rb_mjit_unit_list *list)
{
if (node->prev && node->next) {
node->prev->next = node->next;
node->next->prev = node->prev;
}
else if (node->prev == NULL && node->next) {
list->head = node->next;
node->next->prev = NULL;
}
else if (node->prev && node->next == NULL) {
node->prev->next = NULL;
}
else {
list->head = NULL;
}
list->length--;
xfree(node);
}
/* Return the best unit from list. The best is the first
high priority unit or the unit whose iseq has the biggest number
of calls so far. */
static struct rb_mjit_unit_node *
get_from_list(struct rb_mjit_unit_list *list)
{
struct rb_mjit_unit_node *node, *best = NULL;
if (list->head == NULL)
return NULL;
/* Find iseq with max total_calls */
for (node = list->head; node != NULL; node = node ? node->next : NULL) {
if (node->unit->iseq == NULL) { /* ISeq is GCed. */
free_unit(node->unit);
remove_from_list(node, list);
continue;
}
if (best == NULL || best->unit->iseq->body->total_calls < node->unit->iseq->body->total_calls) {
best = node;
}
}
return best;
}
/* Free unit list. This should be called only when worker is finished
because node of unit_queue and one of active_units may have the same unit
during proceeding unit. */
static void
free_list(struct rb_mjit_unit_list *list)
{
struct rb_mjit_unit_node *node, *next;
for (node = list->head; node != NULL; node = next) {
next = node->next;
free_unit(node->unit);
xfree(node);
}
}
#include "mjit_config.h"
static const char *const CC_DEBUG_ARGS[] = {MJIT_DEBUGFLAGS NULL};
static const char *const CC_OPTIMIZE_ARGS[] = {MJIT_OPTFLAGS NULL};
#if defined __GNUC__ && !defined __clang__
#define GCC_PIC_FLAGS "-Wfatal-errors", "-fPIC", "-shared", "-w", \
"-pipe",
#else
#define GCC_PIC_FLAGS /* empty */
#endif
static const char *const CC_COMMON_ARGS[] = {
MJIT_CC_COMMON MJIT_CFLAGS GCC_PIC_FLAGS
NULL
};
static const char *const CC_LDSHARED_ARGS[] = {MJIT_LDSHARED GCC_PIC_FLAGS NULL};
static const char *const CC_DLDFLAGS_ARGS[] = {
MJIT_DLDFLAGS
#if defined __GNUC__ && !defined __clang__
"-nostartfiles",
# ifndef _WIN32
"-nodefaultlibs", "-nostdlib",
# endif
#endif
NULL
};
#define CC_CODEFLAG_ARGS (mjit_opts.debug ? CC_DEBUG_ARGS : CC_OPTIMIZE_ARGS)
/* Status of the precompiled header creation. The status is
shared by the workers and the pch thread. */
static enum {PCH_NOT_READY, PCH_FAILED, PCH_SUCCESS} pch_status;
/* The function producing the pre-compiled header. */
static void
make_pch(void)
{
int exit_code;
#ifdef _MSC_VER
/* XXX TODO */
exit_code = 0;
#else
const char *rest_args[] = {
# ifdef __clang__
"-emit-pch",
# endif
"-o", NULL, NULL,
NULL,
};
char **args;
int len = sizeof(rest_args) / sizeof(const char *);
rest_args[len - 2] = header_file;
rest_args[len - 3] = pch_file;
verbose(2, "Creating precompiled header");
args = form_args(3, CC_COMMON_ARGS, CC_CODEFLAG_ARGS, rest_args);
if (args == NULL) {
if (mjit_opts.warnings || mjit_opts.verbose)
fprintf(stderr, "MJIT warning: making precompiled header failed on forming args\n");
CRITICAL_SECTION_START(3, "in make_pch");
pch_status = PCH_FAILED;
CRITICAL_SECTION_FINISH(3, "in make_pch");
return;
}
exit_code = exec_process(cc_path, args);
xfree(args);
#endif
CRITICAL_SECTION_START(3, "in make_pch");
if (exit_code == 0) {
pch_status = PCH_SUCCESS;
} else {
if (mjit_opts.warnings || mjit_opts.verbose)
fprintf(stderr, "MJIT warning: Making precompiled header failed on compilation. Stopping MJIT worker...\n");
pch_status = PCH_FAILED;
}
/* wakeup `mjit_finish` */
rb_native_cond_broadcast(&mjit_pch_wakeup);
CRITICAL_SECTION_FINISH(3, "in make_pch");
}
#define append_str2(p, str, len) ((char *)memcpy((p), str, (len))+(len))
#define append_str(p, str) append_str2(p, str, sizeof(str)-1)
#define append_lit(p, str) append_str2(p, str, rb_strlen_lit(str))
/* Compile C file to so. It returns 1 if it succeeds. */
static int
compile_c_to_so(const char *c_file, const char *so_file)
{
int exit_code;
const char *files[] = {
#ifdef __clang__
"-include-pch", NULL,
#endif
#ifndef _MSC_VER
"-o",
#endif
NULL, NULL, NULL};
const char *libs[] = {
#ifdef _WIN32
# ifdef _MSC_VER
MJIT_LIBS
"-link",
libruby_installed,
libruby_build,
# else
/* Look for ruby.dll.a in build and install directories. */
libruby_installed,
libruby_build,
MJIT_LIBS
"-lmsvcrt",
"-lgcc",
# endif
#endif
NULL};
char **args;
#ifdef _MSC_VER
char *p;
int solen;
#endif
files[numberof(files)-2] = c_file;
#ifdef _MSC_VER
solen = strlen(so_file);
files[0] = p = xmalloc(rb_strlen_lit("-Fe") + solen + 1);
p = append_lit(p, "-Fe");
p = append_str2(p, so_file, solen);
*p = '\0';
#else
# ifdef __clang__
files[1] = pch_file;
# endif
files[numberof(files)-3] = so_file;
#endif
args = form_args(5, CC_LDSHARED_ARGS, CC_CODEFLAG_ARGS,
files, libs, CC_DLDFLAGS_ARGS);
if (args == NULL)
return FALSE;
exit_code = exec_process(cc_path, args);
xfree(args);
#ifdef _MSC_VER
xfree((char *)files[0]);
#endif
if (exit_code != 0)
verbose(2, "compile_c_to_so: compile error: %d", exit_code);
return exit_code == 0;
}
static void *
load_func_from_so(const char *so_file, const char *funcname, struct rb_mjit_unit *unit)
{
void *handle, *func;
handle = dlopen(so_file, RTLD_NOW);
if (handle == NULL) {
if (mjit_opts.warnings || mjit_opts.verbose)
fprintf(stderr, "MJIT warning: failure in loading code from '%s': %s\n", so_file, dlerror());
return (void *)NOT_ADDED_JIT_ISEQ_FUNC;
}
func = dlsym(handle, funcname);
unit->handle = handle;
return func;
}
#define MJIT_TMP_PREFIX "_ruby_mjit_"
#ifndef __clang__
static const char *
header_name_end(const char *s)
{
const char *e = s + strlen(s);
#ifdef __GNUC__
static const char suffix[] = ".gch";
/* chomp .gch suffix */
if (e > s+sizeof(suffix)-1 && strcmp(e-sizeof(suffix)+1, suffix) == 0) {
e -= sizeof(suffix)-1;
}
#endif
return e;
}
#endif
static void
print_jit_result(const char *result, const struct rb_mjit_unit *unit, const double duration, const char *c_file)
{
verbose(1, "JIT %s (%.1fms): %s@%s:%d -> %s", result,
duration, RSTRING_PTR(unit->iseq->body->location.label),
RSTRING_PTR(rb_iseq_path(unit->iseq)), FIX2INT(unit->iseq->body->location.first_lineno), c_file);
}
/* Compile ISeq in UNIT and return function pointer of JIT-ed code.
It may return NOT_COMPILABLE_JIT_ISEQ_FUNC if something went wrong. */
static mjit_func_t
convert_unit_to_func(struct rb_mjit_unit *unit)
{
char c_file_buff[70], *c_file = c_file_buff, *so_file, funcname[35];
int success;
int fd;
FILE *f;
void *func;
double start_time, end_time;
int c_file_len = (int)sizeof(c_file_buff);
static const char c_ext[] = ".c";
static const char so_ext[] = DLEXT;
const int access_mode =
#ifdef O_BINARY
O_BINARY|
#endif
O_WRONLY|O_EXCL|O_CREAT;
c_file_len = sprint_uniq_filename(c_file_buff, c_file_len, unit->id, MJIT_TMP_PREFIX, c_ext);
if (c_file_len >= (int)sizeof(c_file_buff)) {
++c_file_len;
c_file = alloca(c_file_len);
c_file_len = sprint_uniq_filename(c_file, c_file_len, unit->id, MJIT_TMP_PREFIX, c_ext);
}
++c_file_len;
so_file = alloca(c_file_len - sizeof(c_ext) + sizeof(so_ext));
memcpy(so_file, c_file, c_file_len - sizeof(c_ext));
memcpy(&so_file[c_file_len - sizeof(c_ext)], so_ext, sizeof(so_ext));
sprintf(funcname, "_mjit%d", unit->id);
fd = rb_cloexec_open(c_file, access_mode, 0600);
if (fd < 0 || (f = fdopen(fd, "w")) == NULL) {
int e = errno;
if (fd >= 0) (void)close(fd);
verbose(1, "Failed to fopen '%s', giving up JIT for it (%s)", c_file, strerror(e));
return (mjit_func_t)NOT_COMPILABLE_JIT_ISEQ_FUNC;
}
#ifdef __clang__
/* -include-pch is used for Clang */
#else
{
# ifdef __GNUC__
const char *s = pch_file;
# else
const char *s = header_file;
# endif
const char *e = header_name_end(s);
fprintf(f, "#include \"");
/* print pch_file except .gch */
for (; s < e; s++) {
switch(*s) {
case '\\': case '"':
fputc('\\', f);
}
fputc(*s, f);
}
fprintf(f, "\"\n");
}
#endif
#ifdef _WIN32
fprintf(f, "void _pei386_runtime_relocator(void){}\n");
fprintf(f, "int __stdcall DllMainCRTStartup(void* hinstDLL, unsigned int fdwReason, void* lpvReserved) { return 1; }\n");
#endif
/* wait until mjit_gc_finish_hook is called */
CRITICAL_SECTION_START(3, "before mjit_compile to wait GC finish");
while (in_gc) {
verbose(3, "Waiting wakeup from GC");
rb_native_cond_wait(&mjit_gc_wakeup, &mjit_engine_mutex);
}
in_jit = TRUE;
CRITICAL_SECTION_FINISH(3, "before mjit_compile to wait GC finish");
{
VALUE s = rb_iseq_path(unit->iseq);
const char *label = RSTRING_PTR(unit->iseq->body->location.label);
const char *path = RSTRING_PTR(s);
int lineno = FIX2INT(unit->iseq->body->location.first_lineno);
verbose(2, "start compile: %s@%s:%d -> %s", label, path, lineno, c_file);
fprintf(f, "/* %s@%s:%d */\n\n", label, path, lineno);
}
success = mjit_compile(f, unit->iseq->body, funcname);
/* release blocking mjit_gc_start_hook */
CRITICAL_SECTION_START(3, "after mjit_compile to wakeup client for GC");
in_jit = FALSE;
verbose(3, "Sending wakeup signal to client in a mjit-worker for GC");
rb_native_cond_signal(&mjit_client_wakeup);
CRITICAL_SECTION_FINISH(3, "in worker to wakeup client for GC");
fclose(f);
if (!success) {
if (!mjit_opts.save_temps)
remove(c_file);
print_jit_result("failure", unit, 0, c_file);
return (mjit_func_t)NOT_COMPILABLE_JIT_ISEQ_FUNC;
}
start_time = real_ms_time();
success = compile_c_to_so(c_file, so_file);
end_time = real_ms_time();
if (!mjit_opts.save_temps)
remove(c_file);
if (!success) {
verbose(2, "Failed to generate so: %s", so_file);
return (mjit_func_t)NOT_COMPILABLE_JIT_ISEQ_FUNC;
}
func = load_func_from_so(so_file, funcname, unit);
if (!mjit_opts.save_temps)
remove(so_file);
if ((ptrdiff_t)func > (ptrdiff_t)LAST_JIT_ISEQ_FUNC) {
struct rb_mjit_unit_node *node = create_list_node(unit);
CRITICAL_SECTION_START(3, "end of jit");
add_to_list(node, &active_units);
if (unit->iseq)
print_jit_result("success", unit, end_time - start_time, c_file);
CRITICAL_SECTION_FINISH(3, "end of jit");
}
return (mjit_func_t)func;
}
/* Set to TRUE to finish worker. */
static int finish_worker_p;
/* Set to TRUE if worker is finished. */
static int worker_finished;
/* The function implementing a worker. It is executed in a separate
thread by rb_thread_create_mjit_thread. It compiles precompiled header
and then compiles requested ISeqs. */
static void
worker(void)
{
make_pch();
if (pch_status == PCH_FAILED) {
mjit_init_p = FALSE;
CRITICAL_SECTION_START(3, "in worker to update worker_finished");
worker_finished = TRUE;
verbose(3, "Sending wakeup signal to client in a mjit-worker");
rb_native_cond_signal(&mjit_client_wakeup);
CRITICAL_SECTION_FINISH(3, "in worker to update worker_finished");
return; /* TODO: do the same thing in the latter half of mjit_finish */
}
/* main worker loop */
while (!finish_worker_p) {
struct rb_mjit_unit_node *node;
/* wait until unit is available */
CRITICAL_SECTION_START(3, "in worker dequeue");
while ((unit_queue.head == NULL || active_units.length > mjit_opts.max_cache_size) && !finish_worker_p) {
rb_native_cond_wait(&mjit_worker_wakeup, &mjit_engine_mutex);
verbose(3, "Getting wakeup from client");
}
node = get_from_list(&unit_queue);
CRITICAL_SECTION_FINISH(3, "in worker dequeue");
if (node) {
mjit_func_t func = convert_unit_to_func(node->unit);
CRITICAL_SECTION_START(3, "in jit func replace");
if (node->unit->iseq) { /* Check whether GCed or not */
/* Usage of jit_code might be not in a critical section. */
MJIT_ATOMIC_SET(node->unit->iseq->body->jit_func, func);
}
remove_from_list(node, &unit_queue);
CRITICAL_SECTION_FINISH(3, "in jit func replace");
}
}
/* To keep mutex unlocked when it is destroyed by mjit_finish, don't wrap CRITICAL_SECTION here. */
worker_finished = TRUE;
}
/* MJIT info related to an existing continutaion. */
struct mjit_cont {
rb_execution_context_t *ec; /* continuation ec */
struct mjit_cont *prev, *next; /* used to form lists */
};
/* Double linked list of registered continuations. This is used to detect
units which are in use in unload_units. */
static struct mjit_cont *first_cont;
/* Register a new continuation with thread TH. Return MJIT info about
the continuation. */
struct mjit_cont *
mjit_cont_new(rb_execution_context_t *ec)
{
struct mjit_cont *cont;
cont = ZALLOC(struct mjit_cont);
cont->ec = ec;
CRITICAL_SECTION_START(3, "in mjit_cont_new");
if (first_cont == NULL) {
cont->next = cont->prev = NULL;
}
else {
cont->prev = NULL;
cont->next = first_cont;
first_cont->prev = cont;
}
first_cont = cont;
CRITICAL_SECTION_FINISH(3, "in mjit_cont_new");
return cont;
}
/* Unregister continuation CONT. */
void
mjit_cont_free(struct mjit_cont *cont)
{
CRITICAL_SECTION_START(3, "in mjit_cont_new");
if (cont == first_cont) {
first_cont = cont->next;
if (first_cont != NULL)
first_cont->prev = NULL;
}
else {
cont->prev->next = cont->next;
if (cont->next != NULL)
cont->next->prev = cont->prev;
}
CRITICAL_SECTION_FINISH(3, "in mjit_cont_new");
xfree(cont);
}
/* Finish work with continuation info. */
static void
finish_conts(void)
{
struct mjit_cont *cont, *next;
for (cont = first_cont; cont != NULL; cont = next) {
next = cont->next;
xfree(cont);
}
}
/* Create unit for ISEQ. */
static void
create_unit(const rb_iseq_t *iseq)
{
struct rb_mjit_unit *unit;
unit = ZALLOC(struct rb_mjit_unit);
if (unit == NULL)
return;
unit->id = current_unit_num++;
unit->iseq = iseq;
iseq->body->jit_unit = unit;
}
/* Set up field used_code_p for unit iseqs whose iseq on the stack of ec. */
static void
mark_ec_units(rb_execution_context_t *ec)
{
const rb_iseq_t *iseq;
const rb_control_frame_t *cfp;
rb_control_frame_t *last_cfp = ec->cfp;
const rb_control_frame_t *end_marker_cfp;
ptrdiff_t i, size;
if (ec->vm_stack == NULL)
return;
end_marker_cfp = RUBY_VM_END_CONTROL_FRAME(ec);
size = end_marker_cfp - last_cfp;
for (i = 0, cfp = end_marker_cfp - 1; i < size; i++, cfp = RUBY_VM_NEXT_CONTROL_FRAME(cfp)) {
if (cfp->pc && (iseq = cfp->iseq) != NULL
&& imemo_type((VALUE) iseq) == imemo_iseq
&& (iseq->body->jit_unit) != NULL) {
iseq->body->jit_unit->used_code_p = TRUE;
}
}
}
/* Unload JIT code of some units to satisfy the maximum permitted
number of units with a loaded code. */
static void
unload_units(void)
{
rb_vm_t *vm = GET_THREAD()->vm;
rb_thread_t *th = NULL;
struct rb_mjit_unit_node *node, *next, *worst_node;
struct rb_mjit_unit *unit;
struct mjit_cont *cont;
int delete_num, units_num = active_units.length;
/* For now, we don't unload units when ISeq is GCed. We should
unload such ISeqs first here. */
for (node = active_units.head; node != NULL; node = next) {
next = node->next;
if (node->unit->iseq == NULL) { /* ISeq is GCed. */
free_unit(node->unit);
remove_from_list(node, &active_units);
}
}
/* Detect units which are in use and can't be unloaded. */
for (node = active_units.head; node != NULL; node = node->next) {
assert(node->unit != NULL && node->unit->iseq != NULL && node->unit->handle != NULL);
node->unit->used_code_p = FALSE;
}
list_for_each(&vm->living_threads, th, vmlt_node) {
mark_ec_units(th->ec);
}
for (cont = first_cont; cont != NULL; cont = cont->next) {
mark_ec_units(cont->ec);
}
/* Remove 1/10 units more to decrease unloading calls. */
delete_num = active_units.length / 10;
for (; active_units.length > mjit_opts.max_cache_size - delete_num;) {
/* Find one unit that has the minimum total_calls. */
worst_node = NULL;
for (node = active_units.head; node != NULL; node = node->next) {
if (node->unit->used_code_p) /* We can't unload code on stack. */
continue;
if (worst_node == NULL || worst_node->unit->iseq->body->total_calls > node->unit->iseq->body->total_calls) {
worst_node = node;
}
}
if (worst_node == NULL)
break;
/* Unload the worst node. */
verbose(2, "Unloading unit %d (calls=%lu)", worst_node->unit->id, worst_node->unit->iseq->body->total_calls);
unit = worst_node->unit;
unit->iseq->body->jit_func = (mjit_func_t)NOT_READY_JIT_ISEQ_FUNC;
remove_from_list(worst_node, &active_units);
assert(unit->handle != NULL);
dlclose(unit->handle);
unit->handle = NULL;
}
verbose(1, "Too many JIT code -- %d units unloaded", units_num - active_units.length);
}
/* Add ISEQ to be JITed in parallel with the current thread.
Unload some JIT codes if there are too many of them. */
void
mjit_add_iseq_to_process(const rb_iseq_t *iseq)
{
struct rb_mjit_unit_node *node;
if (!mjit_init_p)
return;
iseq->body->jit_func = (mjit_func_t)NOT_READY_JIT_ISEQ_FUNC;
create_unit(iseq);
if (iseq->body->jit_unit == NULL)
/* Failure in creating the unit. */
return;
node = create_list_node(iseq->body->jit_unit);
CRITICAL_SECTION_START(3, "in add_iseq_to_process");
add_to_list(node, &unit_queue);
if (active_units.length >= mjit_opts.max_cache_size) {
unload_units();
}
verbose(3, "Sending wakeup signal to workers in mjit_add_iseq_to_process");
rb_native_cond_broadcast(&mjit_worker_wakeup);
CRITICAL_SECTION_FINISH(3, "in add_iseq_to_process");
}
/* For this timeout seconds, --jit-wait will wait for JIT compilation finish. */
#define MJIT_WAIT_TIMEOUT_SECONDS 60
/* Wait for JIT compilation finish for --jit-wait. This should only return a function pointer
or NOT_COMPILABLE_JIT_ISEQ_FUNC. */
mjit_func_t
mjit_get_iseq_func(struct rb_iseq_constant_body *body)
{
struct timeval tv;
int tries = 0;
tv.tv_sec = 0;
tv.tv_usec = 1000;
while (body->jit_func == (mjit_func_t)NOT_READY_JIT_ISEQ_FUNC) {
tries++;
if (tries / 1000 > MJIT_WAIT_TIMEOUT_SECONDS) {
CRITICAL_SECTION_START(3, "in mjit_get_iseq_func to set jit_func");
body->jit_func = (mjit_func_t)NOT_COMPILABLE_JIT_ISEQ_FUNC; /* JIT worker seems dead. Give up. */
CRITICAL_SECTION_FINISH(3, "in mjit_get_iseq_func to set jit_func");
if (mjit_opts.warnings || mjit_opts.verbose)
fprintf(stderr, "MJIT warning: timed out to wait for JIT finish\n");
break;
}
CRITICAL_SECTION_START(3, "in mjit_get_iseq_func for a client wakeup");
rb_native_cond_broadcast(&mjit_worker_wakeup);
CRITICAL_SECTION_FINISH(3, "in mjit_get_iseq_func for a client wakeup");
rb_thread_wait_for(tv);
}
return body->jit_func;
}
/* A name of the header file included in any C file generated by MJIT for iseqs. */
#define RUBY_MJIT_HEADER_NAME "rb_mjit_min_header-"
/* GCC and CLANG executable paths. TODO: The paths should absolute
ones to prevent changing C compiler for security reasons. */
#define CC_PATH CC_COMMON_ARGS[0]
static void
init_header_filename(void)
{
int fd;
/* Root path of the running ruby process. Equal to RbConfig::TOPDIR. */
VALUE basedir_val;
char *basedir;
size_t baselen;
size_t verlen;
static const char header_name[] =
"/" MJIT_HEADER_INSTALL_DIR "/" RUBY_MJIT_HEADER_NAME;
const size_t header_name_len = sizeof(header_name) - 1;
char *p;
#ifdef _WIN32
static const char libpathflag[] =
# ifdef _MSC_VER
"-LIBPATH:"
# else
"-L"
# endif
;
const size_t libpathflag_len = sizeof(libpathflag) - 1;
#endif
basedir_val = rb_const_get(rb_cObject, rb_intern_const("TMP_RUBY_PREFIX"));
basedir = StringValuePtr(basedir_val);
baselen = RSTRING_LEN(basedir_val);
verlen = strlen(ruby_version);
header_file = xmalloc(baselen + header_name_len + verlen + rb_strlen_lit(".h") + 1);
p = append_str2(header_file, basedir, baselen);
p = append_str2(p, header_name, header_name_len);
p = append_str2(p, ruby_version, verlen);
p = append_str2(p, ".h", rb_strlen_lit(".h") + 1);
if ((fd = rb_cloexec_open(header_file, O_RDONLY, 0)) < 0) {
verbose(2, "Cannot access header file %s\n", header_file);
xfree(header_file);
header_file = NULL;
return;
}
(void)close(fd);
#ifdef _WIN32
p = libruby_build = xmalloc(libpathflag_len + baselen + 1);
p = append_str(p, libpathflag);
p = append_str2(p, basedir, baselen);
*p = '\0';
libruby_installed = xmalloc(libpathflag_len + baselen + rb_strlen_lit("/lib") + 1);
p = append_str2(libruby_installed, libruby_build, p - libruby_build);
p = append_lit(p, "/lib");
*p = '\0';
#endif
}
/* This is called after each fork in the child in to switch off MJIT
engine in the child as it does not inherit MJIT threads. */
static void
child_after_fork(void)
{
verbose(3, "Switching off MJIT in a forked child");
mjit_init_p = FALSE;
/* TODO: Should we initiate MJIT in the forked Ruby. */
}
static enum rb_id_table_iterator_result
valid_class_serials_add_i(ID key, VALUE v, void *unused)
{
rb_const_entry_t *ce = (rb_const_entry_t *)v;
VALUE value = ce->value;
if (!rb_is_const_id(key)) return ID_TABLE_CONTINUE;
if (RB_TYPE_P(value, T_MODULE) || RB_TYPE_P(value, T_CLASS)) {
mjit_add_class_serial(RCLASS_SERIAL(value));
}
return ID_TABLE_CONTINUE;
}
#ifdef _WIN32
UINT rb_w32_system_tmpdir(WCHAR *path, UINT len);
#endif
static char *
system_default_tmpdir(void)
{
/* c.f. ext/etc/etc.c:etc_systmpdir() */
#ifdef _WIN32
WCHAR tmppath[_MAX_PATH];
UINT len = rb_w32_system_tmpdir(tmppath, numberof(tmppath));
if (len) {
int blen = WideCharToMultiByte(CP_UTF8, 0, tmppath, len, NULL, 0, NULL, NULL);
char *tmpdir = xmalloc(blen + 1);
WideCharToMultiByte(CP_UTF8, 0, tmppath, len, tmpdir, blen, NULL, NULL);
tmpdir[blen] = '\0';
return tmpdir;
}
#elif defined _CS_DARWIN_USER_TEMP_DIR
#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
#endif
char path[MAXPATHLEN];
size_t len = confstr(_CS_DARWIN_USER_TEMP_DIR, path, sizeof(path));
if (len > 0) {
char *tmpdir = xmalloc(len);
if (len > sizeof(path)) {
confstr(_CS_DARWIN_USER_TEMP_DIR, tmpdir, len);
}
else {
memcpy(tmpdir, path, len);
}
return tmpdir;
}
#endif
return 0;
}
static int
check_tmpdir(const char *dir)
{
struct stat st;
if (!dir) return FALSE;
if (stat(dir, &st)) return FALSE;
#ifndef S_ISDIR
# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
if (!S_ISDIR(st.st_mode)) return FALSE;
#ifndef _WIN32
# ifndef S_IWOTH
# define S_IWOTH 002
# endif
if (st.st_mode & S_IWOTH) {
# ifdef S_ISVTX
if (!(st.st_mode & S_ISVTX)) return FALSE;
# else
return FALSE;
# endif
}
if (access(dir, W_OK)) return FALSE;
#endif
return TRUE;
}
static char *
system_tmpdir(void)
{
char *tmpdir;
# define RETURN_ENV(name) \
if (check_tmpdir(tmpdir = getenv(name))) return get_string(tmpdir)
RETURN_ENV("TMPDIR");
RETURN_ENV("TMP");
tmpdir = system_default_tmpdir();
if (check_tmpdir(tmpdir)) return tmpdir;
return get_string("/tmp");
# undef RETURN_ENV
}
/* Default permitted number of units with a JIT code kept in
memory. */
#define DEFAULT_CACHE_SIZE 1000
/* A default threshold used to add iseq to JIT. */
#define DEFAULT_MIN_CALLS_TO_ADD 5
/* Minimum value for JIT cache size. */
#define MIN_CACHE_SIZE 10
extern const char ruby_description_with_jit[];
/* Initialize MJIT. Start a thread creating the precompiled header and
processing ISeqs. The function should be called first for using MJIT.
If everything is successfull, MJIT_INIT_P will be TRUE. */
void
mjit_init(struct mjit_options *opts)
{
VALUE rb_description;
mjit_opts = *opts;
mjit_init_p = TRUE;
/* Normalize options */
if (mjit_opts.min_calls == 0)
mjit_opts.min_calls = DEFAULT_MIN_CALLS_TO_ADD;
if (mjit_opts.max_cache_size <= 0)
mjit_opts.max_cache_size = DEFAULT_CACHE_SIZE;
if (mjit_opts.max_cache_size < MIN_CACHE_SIZE)
mjit_opts.max_cache_size = MIN_CACHE_SIZE;
verbose(2, "MJIT: CC defaults to %s", CC_PATH);
/* Initialize variables for compilation */
pch_status = PCH_NOT_READY;
cc_path = CC_PATH;
tmp_dir = system_tmpdir();
verbose(2, "MJIT: tmp_dir is %s", tmp_dir);
init_header_filename();
pch_file = get_uniq_filename(0, MJIT_TMP_PREFIX "h", ".h.gch");
if (header_file == NULL || pch_file == NULL) {
mjit_init_p = FALSE;
verbose(1, "Failure in MJIT header file name initialization\n");
return;
}
init_list(&unit_queue);
init_list(&active_units);
/* Initialize mutex */
rb_native_mutex_initialize(&mjit_engine_mutex);
rb_native_cond_initialize(&mjit_pch_wakeup, RB_CONDATTR_CLOCK_MONOTONIC);
rb_native_cond_initialize(&mjit_client_wakeup, RB_CONDATTR_CLOCK_MONOTONIC);
rb_native_cond_initialize(&mjit_worker_wakeup, RB_CONDATTR_CLOCK_MONOTONIC);
rb_native_cond_initialize(&mjit_gc_wakeup, RB_CONDATTR_CLOCK_MONOTONIC);
/* Initialize class_serials cache for compilation */
valid_class_serials = rb_hash_new();
rb_obj_hide(valid_class_serials);
rb_gc_register_mark_object(valid_class_serials);
mjit_add_class_serial(RCLASS_SERIAL(rb_cObject));
mjit_add_class_serial(RCLASS_SERIAL(CLASS_OF(rb_vm_top_self())));
if (RCLASS_CONST_TBL(rb_cObject)) {
rb_id_table_foreach(RCLASS_CONST_TBL(rb_cObject), valid_class_serials_add_i, NULL);
}
/* Overwrites RUBY_DESCRIPTION constant */
rb_const_remove(rb_cObject, rb_intern("RUBY_DESCRIPTION"));
rb_description = rb_usascii_str_new_static(ruby_description_with_jit, strlen(ruby_description_with_jit));
rb_define_global_const("RUBY_DESCRIPTION", rb_obj_freeze(rb_description));
/* Initialize worker thread */
finish_worker_p = FALSE;
worker_finished = FALSE;
if (!rb_thread_create_mjit_thread(child_after_fork, worker)) {
mjit_init_p = FALSE;
rb_native_mutex_destroy(&mjit_engine_mutex);
rb_native_cond_destroy(&mjit_pch_wakeup);
rb_native_cond_destroy(&mjit_client_wakeup);
rb_native_cond_destroy(&mjit_worker_wakeup);
rb_native_cond_destroy(&mjit_gc_wakeup);
verbose(1, "Failure in MJIT thread initialization\n");
}
}
/* Finish the threads processing units and creating PCH, finalize
and free MJIT data. It should be called last during MJIT
life. */
void
mjit_finish(void)
{
if (!mjit_init_p)
return;
/* Wait for pch finish */
verbose(2, "Canceling pch and worker threads");
CRITICAL_SECTION_START(3, "in mjit_finish to wakeup from pch");
/* As our threads are detached, we could just cancel them. But it
is a bad idea because OS processes (C compiler) started by
threads can produce temp files. And even if the temp files are
removed, the used C compiler still complaint about their
absence. So wait for a clean finish of the threads. */
while (pch_status == PCH_NOT_READY) {
verbose(3, "Waiting wakeup from make_pch");
rb_native_cond_wait(&mjit_pch_wakeup, &mjit_engine_mutex);
}
CRITICAL_SECTION_FINISH(3, "in mjit_finish to wakeup from pch");
/* Stop worker */
finish_worker_p = TRUE;
while (!worker_finished) {
verbose(3, "Sending cancel signal to workers");
CRITICAL_SECTION_START(3, "in mjit_finish");
rb_native_cond_broadcast(&mjit_worker_wakeup);
CRITICAL_SECTION_FINISH(3, "in mjit_finish");
}
rb_native_mutex_destroy(&mjit_engine_mutex);
rb_native_cond_destroy(&mjit_pch_wakeup);
rb_native_cond_destroy(&mjit_client_wakeup);
rb_native_cond_destroy(&mjit_worker_wakeup);
rb_native_cond_destroy(&mjit_gc_wakeup);
/* cleanup temps */
if (!mjit_opts.save_temps)
remove(pch_file);
xfree(tmp_dir); tmp_dir = NULL;
xfree(pch_file); pch_file = NULL;
xfree(header_file); header_file = NULL;
free_list(&unit_queue);
free_list(&active_units);
finish_conts();
mjit_init_p = FALSE;
verbose(1, "Successful MJIT finish");
}
void
mjit_mark(void)
{
struct rb_mjit_unit_node *node;
if (!mjit_init_p)
return;
RUBY_MARK_ENTER("mjit");
CRITICAL_SECTION_START(4, "mjit_mark");
for (node = unit_queue.head; node != NULL; node = node->next) {
if (node->unit->iseq) { /* ISeq is still not GCed */
VALUE iseq = (VALUE)node->unit->iseq;
CRITICAL_SECTION_FINISH(4, "mjit_mark rb_gc_mark");
/* Don't wrap critical section with this. This may trigger GC,
and in that case mjit_gc_start_hook causes deadlock. */
rb_gc_mark(iseq);
CRITICAL_SECTION_START(4, "mjit_mark rb_gc_mark");
}
}
CRITICAL_SECTION_FINISH(4, "mjit_mark");
RUBY_MARK_LEAVE("mjit");
}
/* A hook to update valid_class_serials. This should NOT be used in MJIT worker. */
void
mjit_add_class_serial(rb_serial_t class_serial)
{
if (!mjit_init_p)
return;
/* Do not wrap CRITICAL_SECTION here. This function is only called in main thread
and guarded by GVL, and `rb_hash_aset` may cause GC and deadlock in it. */
rb_hash_aset(valid_class_serials, LONG2FIX(class_serial), Qtrue);
}
/* A hook to update valid_class_serials. This should NOT be used in MJIT worker. */
void
mjit_remove_class_serial(rb_serial_t class_serial)
{
if (!mjit_init_p)
return;
CRITICAL_SECTION_START(3, "in mjit_remove_class_serial");
rb_hash_delete_entry(valid_class_serials, LONG2FIX(class_serial));
CRITICAL_SECTION_FINISH(3, "in mjit_remove_class_serial");
}
/* Return TRUE if class_serial is not obsoleted. This can be used in MJIT worker. */
int
mjit_valid_class_serial_p(rb_serial_t class_serial)
{
int found_p;
CRITICAL_SECTION_START(3, "in valid_class_serial_p");
found_p = st_lookup(RHASH_TBL_RAW(valid_class_serials), LONG2FIX(class_serial), NULL);
CRITICAL_SECTION_FINISH(3, "in valid_class_serial_p");
return found_p;
}
|