forked from ruby/ruby
-
Notifications
You must be signed in to change notification settings - Fork 0
/
load.c
1284 lines (1156 loc) · 34.7 KB
/
load.c
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
/*
* load methods from eval.c
*/
#include "ruby/encoding.h"
#include "ruby/util.h"
#include "internal.h"
#include "dln.h"
#include "eval_intern.h"
#include "probes.h"
#include "iseq.h"
static VALUE ruby_dln_librefs;
#define IS_RBEXT(e) (strcmp((e), ".rb") == 0)
#define IS_SOEXT(e) (strcmp((e), ".so") == 0 || strcmp((e), ".o") == 0)
#ifdef DLEXT2
#define IS_DLEXT(e) (strcmp((e), DLEXT) == 0 || strcmp((e), DLEXT2) == 0)
#else
#define IS_DLEXT(e) (strcmp((e), DLEXT) == 0)
#endif
static const char *const loadable_ext[] = {
".rb", DLEXT,
#ifdef DLEXT2
DLEXT2,
#endif
0
};
VALUE
rb_get_load_path(void)
{
VALUE load_path = GET_VM()->load_path;
return load_path;
}
enum expand_type {
EXPAND_ALL,
EXPAND_RELATIVE,
EXPAND_HOME,
EXPAND_NON_CACHE
};
/* Construct expanded load path and store it to cache.
We rebuild load path partially if the cache is invalid.
We don't cache non string object and expand it every time. We ensure that
string objects in $LOAD_PATH are frozen.
*/
static void
rb_construct_expanded_load_path(enum expand_type type, int *has_relative, int *has_non_cache)
{
rb_vm_t *vm = GET_VM();
VALUE load_path = vm->load_path;
VALUE expanded_load_path = vm->expanded_load_path;
VALUE ary;
long i;
int level = rb_safe_level();
ary = rb_ary_tmp_new(RARRAY_LEN(load_path));
for (i = 0; i < RARRAY_LEN(load_path); ++i) {
VALUE path, as_str, expanded_path;
int is_string, non_cache;
char *as_cstr;
as_str = path = RARRAY_AREF(load_path, i);
is_string = RB_TYPE_P(path, T_STRING) ? 1 : 0;
non_cache = !is_string ? 1 : 0;
as_str = rb_get_path_check_to_string(path, level);
as_cstr = RSTRING_PTR(as_str);
if (!non_cache) {
if ((type == EXPAND_RELATIVE &&
rb_is_absolute_path(as_cstr)) ||
(type == EXPAND_HOME &&
(!as_cstr[0] || as_cstr[0] != '~')) ||
(type == EXPAND_NON_CACHE)) {
/* Use cached expanded path. */
rb_ary_push(ary, RARRAY_AREF(expanded_load_path, i));
continue;
}
}
if (!*has_relative && !rb_is_absolute_path(as_cstr))
*has_relative = 1;
if (!*has_non_cache && non_cache)
*has_non_cache = 1;
/* Freeze only string object. We expand other objects every time. */
if (is_string)
rb_str_freeze(path);
as_str = rb_get_path_check_convert(path, as_str, level);
expanded_path = rb_check_realpath(Qnil, as_str);
if (NIL_P(expanded_path)) expanded_path = as_str;
rb_ary_push(ary, rb_fstring(expanded_path));
}
rb_obj_freeze(ary);
vm->expanded_load_path = ary;
rb_ary_replace(vm->load_path_snapshot, vm->load_path);
}
VALUE
rb_get_expanded_load_path(void)
{
rb_vm_t *vm = GET_VM();
const VALUE non_cache = Qtrue;
if (!rb_ary_shared_with_p(vm->load_path_snapshot, vm->load_path)) {
/* The load path was modified. Rebuild the expanded load path. */
int has_relative = 0, has_non_cache = 0;
rb_construct_expanded_load_path(EXPAND_ALL, &has_relative, &has_non_cache);
if (has_relative) {
vm->load_path_check_cache = rb_dir_getwd_ospath();
}
else if (has_non_cache) {
/* Non string object. */
vm->load_path_check_cache = non_cache;
}
else {
vm->load_path_check_cache = 0;
}
}
else if (vm->load_path_check_cache == non_cache) {
int has_relative = 1, has_non_cache = 1;
/* Expand only non-cacheable objects. */
rb_construct_expanded_load_path(EXPAND_NON_CACHE,
&has_relative, &has_non_cache);
}
else if (vm->load_path_check_cache) {
int has_relative = 1, has_non_cache = 1;
VALUE cwd = rb_dir_getwd_ospath();
if (!rb_str_equal(vm->load_path_check_cache, cwd)) {
/* Current working directory or filesystem encoding was changed.
Expand relative load path and non-cacheable objects again. */
vm->load_path_check_cache = cwd;
rb_construct_expanded_load_path(EXPAND_RELATIVE,
&has_relative, &has_non_cache);
}
else {
/* Expand only tilde (User HOME) and non-cacheable objects. */
rb_construct_expanded_load_path(EXPAND_HOME,
&has_relative, &has_non_cache);
}
}
return vm->expanded_load_path;
}
static VALUE
load_path_getter(ID id, VALUE * p)
{
rb_vm_t *vm = (void *)p;
return vm->load_path;
}
static VALUE
get_loaded_features(void)
{
return GET_VM()->loaded_features;
}
static VALUE
get_LOADED_FEATURES(ID _x, VALUE *_y)
{
return get_loaded_features();
}
static void
reset_loaded_features_snapshot(void)
{
rb_vm_t *vm = GET_VM();
rb_ary_replace(vm->loaded_features_snapshot, vm->loaded_features);
}
static struct st_table *
get_loaded_features_index_raw(void)
{
return GET_VM()->loaded_features_index;
}
static st_table *
get_loading_table(void)
{
return GET_VM()->loading_table;
}
static st_data_t
feature_key(const char *str, size_t len)
{
return st_hash(str, len, 0xfea7009e);
}
static void
features_index_add_single(const char* str, size_t len, VALUE offset)
{
struct st_table *features_index;
VALUE this_feature_index = Qnil;
st_data_t short_feature_key;
Check_Type(offset, T_FIXNUM);
short_feature_key = feature_key(str, len);
features_index = get_loaded_features_index_raw();
st_lookup(features_index, short_feature_key, (st_data_t *)&this_feature_index);
if (NIL_P(this_feature_index)) {
st_insert(features_index, short_feature_key, (st_data_t)offset);
}
else if (RB_TYPE_P(this_feature_index, T_FIXNUM)) {
VALUE feature_indexes[2];
feature_indexes[0] = this_feature_index;
feature_indexes[1] = offset;
this_feature_index = (VALUE)xcalloc(1, sizeof(struct RArray));
RBASIC(this_feature_index)->flags = T_ARRAY; /* fake VALUE, do not mark/sweep */
rb_ary_cat(this_feature_index, feature_indexes, numberof(feature_indexes));
st_insert(features_index, short_feature_key, (st_data_t)this_feature_index);
}
else {
Check_Type(this_feature_index, T_ARRAY);
rb_ary_push(this_feature_index, offset);
}
}
/* Add to the loaded-features index all the required entries for
`feature`, located at `offset` in $LOADED_FEATURES. We add an
index entry at each string `short_feature` for which
feature == "#{prefix}#{short_feature}#{ext}"
where `ext` is empty or matches %r{^\.[^./]*$}, and `prefix` is empty
or ends in '/'. This maintains the invariant that `rb_feature_p()`
relies on for its fast lookup.
*/
static void
features_index_add(VALUE feature, VALUE offset)
{
const char *feature_str, *feature_end, *ext, *p;
feature_str = StringValuePtr(feature);
feature_end = feature_str + RSTRING_LEN(feature);
for (ext = feature_end; ext > feature_str; ext--)
if (*ext == '.' || *ext == '/')
break;
if (*ext != '.')
ext = NULL;
/* Now `ext` points to the only string matching %r{^\.[^./]*$} that is
at the end of `feature`, or is NULL if there is no such string. */
p = ext ? ext : feature_end;
while (1) {
p--;
while (p >= feature_str && *p != '/')
p--;
if (p < feature_str)
break;
/* Now *p == '/'. We reach this point for every '/' in `feature`. */
features_index_add_single(p + 1, feature_end - p - 1, offset);
if (ext) {
features_index_add_single(p + 1, ext - p - 1, offset);
}
}
features_index_add_single(feature_str, feature_end - feature_str, offset);
if (ext) {
features_index_add_single(feature_str, ext - feature_str, offset);
}
}
static int
loaded_features_index_clear_i(st_data_t key, st_data_t val, st_data_t arg)
{
VALUE obj = (VALUE)val;
if (!SPECIAL_CONST_P(obj)) {
rb_ary_free(obj);
ruby_sized_xfree((void *)obj, sizeof(struct RArray));
}
return ST_DELETE;
}
static st_table *
get_loaded_features_index(void)
{
VALUE features;
int i;
rb_vm_t *vm = GET_VM();
if (!rb_ary_shared_with_p(vm->loaded_features_snapshot, vm->loaded_features)) {
/* The sharing was broken; something (other than us in rb_provide_feature())
modified loaded_features. Rebuild the index. */
st_foreach(vm->loaded_features_index, loaded_features_index_clear_i, 0);
features = vm->loaded_features;
for (i = 0; i < RARRAY_LEN(features); i++) {
VALUE entry, as_str;
as_str = entry = rb_ary_entry(features, i);
StringValue(as_str);
as_str = rb_fstring(rb_str_freeze(as_str));
if (as_str != entry)
rb_ary_store(features, i, as_str);
features_index_add(as_str, INT2FIX(i));
}
reset_loaded_features_snapshot();
}
return vm->loaded_features_index;
}
/* This searches `load_path` for a value such that
name == "#{load_path[i]}/#{feature}"
if `feature` is a suffix of `name`, or otherwise
name == "#{load_path[i]}/#{feature}#{ext}"
for an acceptable string `ext`. It returns
`load_path[i].to_str` if found, else 0.
If type is 's', then `ext` is acceptable only if IS_DLEXT(ext);
if 'r', then only if IS_RBEXT(ext); otherwise `ext` may be absent
or have any value matching `%r{^\.[^./]*$}`.
*/
static VALUE
loaded_feature_path(const char *name, long vlen, const char *feature, long len,
int type, VALUE load_path)
{
long i;
long plen;
const char *e;
if (vlen < len+1) return 0;
if (strchr(feature, '.') && !strncmp(name+(vlen-len), feature, len)) {
plen = vlen - len;
}
else {
for (e = name + vlen; name != e && *e != '.' && *e != '/'; --e);
if (*e != '.' ||
e-name < len ||
strncmp(e-len, feature, len))
return 0;
plen = e - name - len;
}
if (plen > 0 && name[plen-1] != '/') {
return 0;
}
if (type == 's' ? !IS_DLEXT(&name[plen+len]) :
type == 'r' ? !IS_RBEXT(&name[plen+len]) :
0) {
return 0;
}
/* Now name == "#{prefix}/#{feature}#{ext}" where ext is acceptable
(possibly empty) and prefix is some string of length plen. */
if (plen > 0) --plen; /* exclude '.' */
for (i = 0; i < RARRAY_LEN(load_path); ++i) {
VALUE p = RARRAY_AREF(load_path, i);
const char *s = StringValuePtr(p);
long n = RSTRING_LEN(p);
if (n != plen) continue;
if (n && strncmp(name, s, n)) continue;
return p;
}
return 0;
}
struct loaded_feature_searching {
const char *name;
long len;
int type;
VALUE load_path;
const char *result;
};
static int
loaded_feature_path_i(st_data_t v, st_data_t b, st_data_t f)
{
const char *s = (const char *)v;
struct loaded_feature_searching *fp = (struct loaded_feature_searching *)f;
VALUE p = loaded_feature_path(s, strlen(s), fp->name, fp->len,
fp->type, fp->load_path);
if (!p) return ST_CONTINUE;
fp->result = s;
return ST_STOP;
}
static int
rb_feature_p(const char *feature, const char *ext, int rb, int expanded, const char **fn)
{
VALUE features, this_feature_index = Qnil, v, p, load_path = 0;
const char *f, *e;
long i, len, elen, n;
st_table *loading_tbl, *features_index;
st_data_t data;
st_data_t key;
int type;
if (fn) *fn = 0;
if (ext) {
elen = strlen(ext);
len = strlen(feature) - elen;
type = rb ? 'r' : 's';
}
else {
len = strlen(feature);
elen = 0;
type = 0;
}
features = get_loaded_features();
features_index = get_loaded_features_index();
key = feature_key(feature, strlen(feature));
st_lookup(features_index, key, (st_data_t *)&this_feature_index);
/* We search `features` for an entry such that either
"#{features[i]}" == "#{load_path[j]}/#{feature}#{e}"
for some j, or
"#{features[i]}" == "#{feature}#{e}"
Here `e` is an "allowed" extension -- either empty or one
of the extensions accepted by IS_RBEXT, IS_SOEXT, or
IS_DLEXT. Further, if `ext && rb` then `IS_RBEXT(e)`,
and if `ext && !rb` then `IS_SOEXT(e) || IS_DLEXT(e)`.
If `expanded`, then only the latter form (without load_path[j])
is accepted. Otherwise either form is accepted, *unless* `ext`
is false and an otherwise-matching entry of the first form is
preceded by an entry of the form
"#{features[i2]}" == "#{load_path[j2]}/#{feature}#{e2}"
where `e2` matches %r{^\.[^./]*$} but is not an allowed extension.
After a "distractor" entry of this form, only entries of the
form "#{feature}#{e}" are accepted.
In `rb_provide_feature()` and `get_loaded_features_index()` we
maintain an invariant that the array `this_feature_index` will
point to every entry in `features` which has the form
"#{prefix}#{feature}#{e}"
where `e` is empty or matches %r{^\.[^./]*$}, and `prefix` is empty
or ends in '/'. This includes both match forms above, as well
as any distractors, so we may ignore all other entries in `features`.
*/
if (!NIL_P(this_feature_index)) {
for (i = 0; ; i++) {
VALUE entry;
long index;
if (RB_TYPE_P(this_feature_index, T_ARRAY)) {
if (i >= RARRAY_LEN(this_feature_index)) break;
entry = RARRAY_AREF(this_feature_index, i);
}
else {
if (i > 0) break;
entry = this_feature_index;
}
index = FIX2LONG(entry);
v = RARRAY_AREF(features, index);
f = StringValuePtr(v);
if ((n = RSTRING_LEN(v)) < len) continue;
if (strncmp(f, feature, len) != 0) {
if (expanded) continue;
if (!load_path) load_path = rb_get_expanded_load_path();
if (!(p = loaded_feature_path(f, n, feature, len, type, load_path)))
continue;
expanded = 1;
f += RSTRING_LEN(p) + 1;
}
if (!*(e = f + len)) {
if (ext) continue;
return 'u';
}
if (*e != '.') continue;
if ((!rb || !ext) && (IS_SOEXT(e) || IS_DLEXT(e))) {
return 's';
}
if ((rb || !ext) && (IS_RBEXT(e))) {
return 'r';
}
}
}
loading_tbl = get_loading_table();
f = 0;
if (!expanded) {
struct loaded_feature_searching fs;
fs.name = feature;
fs.len = len;
fs.type = type;
fs.load_path = load_path ? load_path : rb_get_expanded_load_path();
fs.result = 0;
st_foreach(loading_tbl, loaded_feature_path_i, (st_data_t)&fs);
if ((f = fs.result) != 0) {
if (fn) *fn = f;
goto loading;
}
}
if (st_get_key(loading_tbl, (st_data_t)feature, &data)) {
if (fn) *fn = (const char*)data;
loading:
if (!ext) return 'u';
return !IS_RBEXT(ext) ? 's' : 'r';
}
else {
VALUE bufstr;
char *buf;
static const char so_ext[][4] = {
".so", ".o",
};
if (ext && *ext) return 0;
bufstr = rb_str_tmp_new(len + DLEXT_MAXLEN);
buf = RSTRING_PTR(bufstr);
MEMCPY(buf, feature, char, len);
for (i = 0; (e = loadable_ext[i]) != 0; i++) {
strlcpy(buf + len, e, DLEXT_MAXLEN + 1);
if (st_get_key(loading_tbl, (st_data_t)buf, &data)) {
rb_str_resize(bufstr, 0);
if (fn) *fn = (const char*)data;
return i ? 's' : 'r';
}
}
for (i = 0; i < numberof(so_ext); i++) {
strlcpy(buf + len, so_ext[i], DLEXT_MAXLEN + 1);
if (st_get_key(loading_tbl, (st_data_t)buf, &data)) {
rb_str_resize(bufstr, 0);
if (fn) *fn = (const char*)data;
return 's';
}
}
rb_str_resize(bufstr, 0);
}
return 0;
}
int
rb_provided(const char *feature)
{
return rb_feature_provided(feature, 0);
}
int
rb_feature_provided(const char *feature, const char **loading)
{
const char *ext = strrchr(feature, '.');
VALUE fullpath = 0;
if (*feature == '.' &&
(feature[1] == '/' || strncmp(feature+1, "./", 2) == 0)) {
fullpath = rb_file_expand_path_fast(rb_get_path(rb_str_new2(feature)), Qnil);
feature = RSTRING_PTR(fullpath);
}
if (ext && !strchr(ext, '/')) {
if (IS_RBEXT(ext)) {
if (rb_feature_p(feature, ext, TRUE, FALSE, loading)) return TRUE;
return FALSE;
}
else if (IS_SOEXT(ext) || IS_DLEXT(ext)) {
if (rb_feature_p(feature, ext, FALSE, FALSE, loading)) return TRUE;
return FALSE;
}
}
if (rb_feature_p(feature, 0, TRUE, FALSE, loading))
return TRUE;
RB_GC_GUARD(fullpath);
return FALSE;
}
static void
rb_provide_feature(VALUE feature)
{
VALUE features;
features = get_loaded_features();
if (OBJ_FROZEN(features)) {
rb_raise(rb_eRuntimeError,
"$LOADED_FEATURES is frozen; cannot append feature");
}
rb_str_freeze(feature);
rb_ary_push(features, rb_fstring(feature));
features_index_add(feature, INT2FIX(RARRAY_LEN(features)-1));
reset_loaded_features_snapshot();
}
void
rb_provide(const char *feature)
{
rb_provide_feature(rb_fstring_cstr(feature));
}
NORETURN(static void load_failed(VALUE));
static inline void
load_iseq_eval(rb_execution_context_t *ec, VALUE fname)
{
const rb_iseq_t *iseq = rb_iseq_load_iseq(fname);
if (!iseq) {
rb_ast_t *ast;
VALUE parser = rb_parser_new();
rb_parser_set_context(parser, NULL, FALSE);
ast = (rb_ast_t *)rb_parser_load_file(parser, fname);
iseq = rb_iseq_new_top(&ast->body, rb_fstring_lit("<top (required)>"),
fname, rb_realpath_internal(Qnil, fname, 1), NULL);
rb_ast_dispose(ast);
}
rb_exec_event_hook_script_compiled(ec, iseq, Qnil);
rb_iseq_eval(iseq);
}
static inline enum ruby_tag_type
load_wrapping(rb_execution_context_t *ec, VALUE fname)
{
enum ruby_tag_type state;
rb_thread_t *th = rb_ec_thread_ptr(ec);
volatile VALUE wrapper = th->top_wrapper;
volatile VALUE self = th->top_self;
#if !defined __GNUC__
rb_thread_t *volatile th0 = th;
#endif
ec->errinfo = Qnil; /* ensure */
/* load in anonymous module as toplevel */
th->top_self = rb_obj_clone(rb_vm_top_self());
th->top_wrapper = rb_module_new();
rb_extend_object(th->top_self, th->top_wrapper);
EC_PUSH_TAG(ec);
state = EC_EXEC_TAG();
if (state == TAG_NONE) {
load_iseq_eval(ec, fname);
}
EC_POP_TAG();
#if !defined __GNUC__
th = th0;
fname = RB_GC_GUARD(fname);
#endif
th->top_self = self;
th->top_wrapper = wrapper;
return state;
}
static inline void
raise_load_if_failed(rb_execution_context_t *ec, enum ruby_tag_type state)
{
if (state) {
rb_vm_jump_tag_but_local_jump(state);
}
if (!NIL_P(ec->errinfo)) {
rb_exc_raise(ec->errinfo);
}
}
static void
rb_load_internal(VALUE fname, int wrap)
{
rb_execution_context_t *ec = GET_EC();
enum ruby_tag_type state = TAG_NONE;
if (wrap) {
state = load_wrapping(ec, fname);
}
else {
load_iseq_eval(ec, fname);
}
raise_load_if_failed(ec, state);
}
void
rb_load(VALUE fname, int wrap)
{
VALUE tmp = rb_find_file(FilePathValue(fname));
if (!tmp) load_failed(fname);
rb_load_internal(tmp, wrap);
}
void
rb_load_protect(VALUE fname, int wrap, int *pstate)
{
enum ruby_tag_type state;
EC_PUSH_TAG(GET_EC());
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
rb_load(fname, wrap);
}
EC_POP_TAG();
if (state != TAG_NONE) *pstate = state;
}
/*
* call-seq:
* load(filename, wrap=false) -> true
*
* Loads and executes the Ruby
* program in the file _filename_. If the filename does not
* resolve to an absolute path, the file is searched for in the library
* directories listed in <code>$:</code>. If the optional _wrap_
* parameter is +true+, the loaded script will be executed
* under an anonymous module, protecting the calling program's global
* namespace. In no circumstance will any local variables in the loaded
* file be propagated to the loading environment.
*/
static VALUE
rb_f_load(int argc, VALUE *argv, VALUE _)
{
VALUE fname, wrap, path, orig_fname;
rb_scan_args(argc, argv, "11", &fname, &wrap);
orig_fname = rb_get_path_check_to_string(fname, rb_safe_level());
fname = rb_str_encode_ospath(orig_fname);
RUBY_DTRACE_HOOK(LOAD_ENTRY, RSTRING_PTR(orig_fname));
path = rb_find_file(fname);
if (!path) {
if (!rb_file_load_ok(RSTRING_PTR(fname)))
load_failed(orig_fname);
path = fname;
}
rb_load_internal(path, RTEST(wrap));
RUBY_DTRACE_HOOK(LOAD_RETURN, RSTRING_PTR(orig_fname));
return Qtrue;
}
static char *
load_lock(const char *ftptr)
{
st_data_t data;
st_table *loading_tbl = get_loading_table();
if (!st_lookup(loading_tbl, (st_data_t)ftptr, &data)) {
/* partial state */
ftptr = ruby_strdup(ftptr);
data = (st_data_t)rb_thread_shield_new();
st_insert(loading_tbl, (st_data_t)ftptr, data);
return (char *)ftptr;
}
else if (imemo_type_p(data, imemo_memo)) {
struct MEMO *memo = MEMO_CAST(data);
void (*init)(void) = memo->u3.func;
data = (st_data_t)rb_thread_shield_new();
st_insert(loading_tbl, (st_data_t)ftptr, data);
(*init)();
return (char *)"";
}
if (RTEST(ruby_verbose)) {
VALUE warning = rb_warning_string("loading in progress, circular require considered harmful - %s", ftptr);
rb_backtrace_each(rb_str_append, warning);
rb_warning("%"PRIsVALUE, warning);
}
switch (rb_thread_shield_wait((VALUE)data)) {
case Qfalse:
case Qnil:
return 0;
}
return (char *)ftptr;
}
static int
release_thread_shield(st_data_t *key, st_data_t *value, st_data_t done, int existing)
{
VALUE thread_shield = (VALUE)*value;
if (!existing) return ST_STOP;
if (done) {
rb_thread_shield_destroy(thread_shield);
/* Delete the entry even if there are waiting threads, because they
* won't load the file and won't delete the entry. */
}
else if (rb_thread_shield_release(thread_shield)) {
/* still in-use */
return ST_CONTINUE;
}
xfree((char *)*key);
return ST_DELETE;
}
static void
load_unlock(const char *ftptr, int done)
{
if (ftptr) {
st_data_t key = (st_data_t)ftptr;
st_table *loading_tbl = get_loading_table();
st_update(loading_tbl, key, release_thread_shield, done);
}
}
/*
* call-seq:
* require(name) -> true or false
*
* Loads the given +name+, returning +true+ if successful and +false+ if the
* feature is already loaded.
*
* If the filename does not resolve to an absolute path, it will be searched
* for in the directories listed in <code>$LOAD_PATH</code> (<code>$:</code>).
*
* If the filename has the extension ".rb", it is loaded as a source file; if
* the extension is ".so", ".o", or ".dll", or the default shared library
* extension on the current platform, Ruby loads the shared library as a
* Ruby extension. Otherwise, Ruby tries adding ".rb", ".so", and so on
* to the name until found. If the file named cannot be found, a LoadError
* will be raised.
*
* For Ruby extensions the filename given may use any shared library
* extension. For example, on Linux the socket extension is "socket.so" and
* <code>require 'socket.dll'</code> will load the socket extension.
*
* The absolute path of the loaded file is added to
* <code>$LOADED_FEATURES</code> (<code>$"</code>). A file will not be
* loaded again if its path already appears in <code>$"</code>. For example,
* <code>require 'a'; require './a'</code> will not load <code>a.rb</code>
* again.
*
* require "my-library.rb"
* require "db-driver"
*
* Any constants or globals within the loaded source file will be available
* in the calling program's global namespace. However, local variables will
* not be propagated to the loading environment.
*
*/
VALUE
rb_f_require(VALUE obj, VALUE fname)
{
return rb_require_safe(fname, rb_safe_level());
}
/*
* call-seq:
* require_relative(string) -> true or false
*
* Ruby tries to load the library named _string_ relative to the requiring
* file's path. If the file's path cannot be determined a LoadError is raised.
* If a file is loaded +true+ is returned and false otherwise.
*/
VALUE
rb_f_require_relative(VALUE obj, VALUE fname)
{
VALUE base = rb_current_realfilepath();
if (NIL_P(base)) {
rb_loaderror("cannot infer basepath");
}
base = rb_file_dirname(base);
return rb_require_safe(rb_file_absolute_path(fname, base), rb_safe_level());
}
typedef int (*feature_func)(const char *feature, const char *ext, int rb, int expanded, const char **fn);
static int
search_required(VALUE fname, volatile VALUE *path, int safe_level, feature_func rb_feature_p)
{
VALUE tmp;
char *ext, *ftptr;
int type, ft = 0;
const char *loading;
*path = 0;
ext = strrchr(ftptr = RSTRING_PTR(fname), '.');
if (ext && !strchr(ext, '/')) {
if (IS_RBEXT(ext)) {
if (rb_feature_p(ftptr, ext, TRUE, FALSE, &loading)) {
if (loading) *path = rb_filesystem_str_new_cstr(loading);
return 'r';
}
if ((tmp = rb_find_file_safe(fname, safe_level)) != 0) {
ext = strrchr(ftptr = RSTRING_PTR(tmp), '.');
if (!rb_feature_p(ftptr, ext, TRUE, TRUE, &loading) || loading)
*path = tmp;
return 'r';
}
return 0;
}
else if (IS_SOEXT(ext)) {
if (rb_feature_p(ftptr, ext, FALSE, FALSE, &loading)) {
if (loading) *path = rb_filesystem_str_new_cstr(loading);
return 's';
}
tmp = rb_str_subseq(fname, 0, ext - RSTRING_PTR(fname));
#ifdef DLEXT2
OBJ_FREEZE(tmp);
if (rb_find_file_ext_safe(&tmp, loadable_ext + 1, safe_level)) {
ext = strrchr(ftptr = RSTRING_PTR(tmp), '.');
if (!rb_feature_p(ftptr, ext, FALSE, TRUE, &loading) || loading)
*path = tmp;
return 's';
}
#else
rb_str_cat2(tmp, DLEXT);
OBJ_FREEZE(tmp);
if ((tmp = rb_find_file_safe(tmp, safe_level)) != 0) {
ext = strrchr(ftptr = RSTRING_PTR(tmp), '.');
if (!rb_feature_p(ftptr, ext, FALSE, TRUE, &loading) || loading)
*path = tmp;
return 's';
}
#endif
}
else if (IS_DLEXT(ext)) {
if (rb_feature_p(ftptr, ext, FALSE, FALSE, &loading)) {
if (loading) *path = rb_filesystem_str_new_cstr(loading);
return 's';
}
if ((tmp = rb_find_file_safe(fname, safe_level)) != 0) {
ext = strrchr(ftptr = RSTRING_PTR(tmp), '.');
if (!rb_feature_p(ftptr, ext, FALSE, TRUE, &loading) || loading)
*path = tmp;
return 's';
}
}
}
else if ((ft = rb_feature_p(ftptr, 0, FALSE, FALSE, &loading)) == 'r') {
if (loading) *path = rb_filesystem_str_new_cstr(loading);
return 'r';
}
tmp = fname;
type = rb_find_file_ext_safe(&tmp, loadable_ext, safe_level);
switch (type) {
case 0:
if (ft)
goto statically_linked;
ftptr = RSTRING_PTR(tmp);
return rb_feature_p(ftptr, 0, FALSE, TRUE, 0);
default:
if (ft) {
statically_linked:
if (loading) *path = rb_filesystem_str_new_cstr(loading);
return ft;
}
/* fall through */
case 1:
ext = strrchr(ftptr = RSTRING_PTR(tmp), '.');
if (rb_feature_p(ftptr, ext, !--type, TRUE, &loading) && !loading)
break;
*path = tmp;
}
return type ? 's' : 'r';
}
static void
load_failed(VALUE fname)
{
rb_load_fail(fname, "cannot load such file");
}
static VALUE
load_ext(VALUE path)
{
rb_scope_visibility_set(METHOD_VISI_PUBLIC);
return (VALUE)dln_load(RSTRING_PTR(path));
}
static int
no_feature_p(const char *feature, const char *ext, int rb, int expanded, const char **fn)
{
return 0;
}
// Documented in doc/globals.rdoc
VALUE
rb_resolve_feature_path(VALUE klass, VALUE fname)
{
VALUE path;
int found;
VALUE sym;
fname = rb_get_path_check(fname, 0);
path = rb_str_encode_ospath(fname);
found = search_required(path, &path, 0, no_feature_p);
switch (found) {
case 'r':
sym = ID2SYM(rb_intern("rb"));
break;
case 's':
sym = ID2SYM(rb_intern("so"));
break;
default:
load_failed(fname);
}
return rb_ary_new_from_args(2, sym, path);
}
/*
* returns
* 0: if already loaded (false)
* 1: successfully loaded (true)
* <0: not found (LoadError)
* >1: exception
*/
static int
require_internal(rb_execution_context_t *ec, VALUE fname, int safe, int exception)
{
volatile int result = -1;
rb_thread_t *th = rb_ec_thread_ptr(ec);
volatile VALUE wrapper = th->top_wrapper;
volatile VALUE self = th->top_self;
volatile VALUE errinfo = ec->errinfo;
enum ruby_tag_type state;
struct {
int safe;
} volatile saved;
char *volatile ftptr = 0;
VALUE path;