forked from ruby/ruby
-
Notifications
You must be signed in to change notification settings - Fork 0
/
eval.c
1955 lines (1751 loc) · 46.8 KB
/
eval.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
/**********************************************************************
eval.c -
$Author$
created at: Thu Jun 10 14:22:17 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "internal.h"
#include "eval_intern.h"
#include "iseq.h"
#include "gc.h"
#include "ruby/vm.h"
#include "vm_core.h"
#include "mjit.h"
#include "probes.h"
#include "probes_helper.h"
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
NORETURN(void rb_raise_jump(VALUE, VALUE));
VALUE rb_eLocalJumpError;
VALUE rb_eSysStackError;
ID ruby_static_id_signo, ruby_static_id_status;
extern ID ruby_static_id_cause;
#define id_cause ruby_static_id_cause
#define exception_error GET_VM()->special_exceptions[ruby_error_reenter]
#include "eval_error.c"
#include "eval_jump.c"
#define CLASS_OR_MODULE_P(obj) \
(!SPECIAL_CONST_P(obj) && \
(BUILTIN_TYPE(obj) == T_CLASS || BUILTIN_TYPE(obj) == T_MODULE))
/*!
* Initializes the Ruby VM and builtin libraries.
* @retval 0 if succeeded.
* @retval non-zero an error occurred.
*/
int
ruby_setup(void)
{
enum ruby_tag_type state;
if (GET_VM())
return 0;
ruby_init_stack((void *)&state);
/*
* Disable THP early before mallocs happen because we want this to
* affect as many future pages as possible for CoW-friendliness
*/
#if defined(__linux__) && defined(PR_SET_THP_DISABLE)
prctl(PR_SET_THP_DISABLE, 1, 0, 0, 0);
#endif
Init_BareVM();
Init_heap();
rb_addr2insn_init();
Init_vm_objects();
EC_PUSH_TAG(GET_EC());
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
rb_call_inits();
ruby_prog_init();
GET_VM()->running = 1;
}
EC_POP_TAG();
return state;
}
/*!
* Calls ruby_setup() and check error.
*
* Prints errors and calls exit(3) if an error occurred.
*/
void
ruby_init(void)
{
int state = ruby_setup();
if (state) {
if (RTEST(ruby_debug))
error_print(GET_EC());
exit(EXIT_FAILURE);
}
}
/*! Processes command line arguments and compiles the Ruby source to execute.
*
* This function does:
* \li Processes the given command line flags and arguments for ruby(1)
* \li compiles the source code from the given argument, -e or stdin, and
* \li returns the compiled source as an opaque pointer to an internal data structure
*
* @return an opaque pointer to the compiled source or an internal special value.
* @sa ruby_executable_node().
*/
void *
ruby_options(int argc, char **argv)
{
enum ruby_tag_type state;
void *volatile iseq = 0;
ruby_init_stack((void *)&iseq);
EC_PUSH_TAG(GET_EC());
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
SAVE_ROOT_JMPBUF(GET_THREAD(), iseq = ruby_process_options(argc, argv));
}
else {
rb_clear_trace_func();
state = error_handle(state);
iseq = (void *)INT2FIX(state);
}
EC_POP_TAG();
return iseq;
}
static void
ruby_finalize_0(void)
{
EC_PUSH_TAG(GET_EC());
if (EC_EXEC_TAG() == TAG_NONE) {
rb_trap_exit();
}
EC_POP_TAG();
rb_exec_end_proc();
rb_clear_trace_func();
}
static void
ruby_finalize_1(void)
{
ruby_sig_finalize();
GET_EC()->errinfo = Qnil;
rb_gc_call_finalizer_at_exit();
}
/** Runs the VM finalization processes.
*
* <code>END{}</code> and procs registered by <code>Kernel.#at_exit</code> are
* executed here. See the Ruby language spec for more details.
*
* @note This function is allowed to raise an exception if an error occurred.
*/
void
ruby_finalize(void)
{
ruby_finalize_0();
ruby_finalize_1();
}
/** Destructs the VM.
*
* Runs the VM finalization processes as well as ruby_finalize(), and frees
* resources used by the VM.
*
* @param ex Default value to the return value.
* @return If an error occurred returns a non-zero. If otherwise, returns the
* given ex.
* @note This function does not raise any exception.
*/
int
ruby_cleanup(volatile int ex)
{
int state;
volatile VALUE errs[2];
rb_thread_t *th = GET_THREAD();
int nerr;
volatile int sysex = EXIT_SUCCESS;
volatile int step = 0;
rb_threadptr_interrupt(th);
rb_threadptr_check_signal(th);
EC_PUSH_TAG(th->ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
SAVE_ROOT_JMPBUF(th, { RUBY_VM_CHECK_INTS(th->ec); });
step_0: step++;
errs[1] = th->ec->errinfo;
rb_set_safe_level_force(0);
ruby_init_stack(&errs[STACK_UPPER(errs, 0, 1)]);
SAVE_ROOT_JMPBUF(th, ruby_finalize_0());
step_1: step++;
/* protect from Thread#raise */
th->status = THREAD_KILLED;
errs[0] = th->ec->errinfo;
SAVE_ROOT_JMPBUF(th, rb_thread_terminate_all());
}
else {
switch (step) {
case 0: goto step_0;
case 1: goto step_1;
}
if (ex == 0) ex = state;
}
th->ec->errinfo = errs[1];
sysex = error_handle(ex);
state = 0;
for (nerr = 0; nerr < numberof(errs); ++nerr) {
VALUE err = ATOMIC_VALUE_EXCHANGE(errs[nerr], Qnil);
if (!RTEST(err)) continue;
/* th->ec->errinfo contains a NODE while break'ing */
if (THROW_DATA_P(err)) continue;
if (rb_obj_is_kind_of(err, rb_eSystemExit)) {
sysex = sysexit_status(err);
break;
}
else if (rb_obj_is_kind_of(err, rb_eSignal)) {
VALUE sig = rb_ivar_get(err, id_signo);
state = NUM2INT(sig);
break;
}
else if (sysex == EXIT_SUCCESS) {
sysex = EXIT_FAILURE;
}
}
mjit_finish(); /* We still need ISeqs here. */
ruby_finalize_1();
/* unlock again if finalizer took mutexes. */
rb_threadptr_unlock_all_locking_mutexes(GET_THREAD());
EC_POP_TAG();
rb_thread_stop_timer_thread();
ruby_vm_destruct(GET_VM());
if (state) ruby_default_signal(state);
return sysex;
}
static int
ruby_exec_internal(void *n)
{
volatile int state;
rb_iseq_t *iseq = (rb_iseq_t *)n;
rb_thread_t * volatile th = GET_THREAD();
if (!n) return 0;
EC_PUSH_TAG(th->ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
SAVE_ROOT_JMPBUF(th, {
rb_iseq_eval_main(iseq);
});
}
EC_POP_TAG();
return state;
}
/*! Calls ruby_cleanup() and exits the process */
void
ruby_stop(int ex)
{
exit(ruby_cleanup(ex));
}
/*! Checks the return value of ruby_options().
* @param n return value of ruby_options().
* @param status pointer to the exit status of this process.
*
* ruby_options() sometimes returns a special value to indicate this process
* should immediately exit. This function checks if the case. Also stores the
* exit status that the caller have to pass to exit(3) into
* <code>*status</code>.
*
* @retval non-zero if the given opaque pointer is actually a compiled source.
* @retval 0 if the given value is such a special value.
*/
int
ruby_executable_node(void *n, int *status)
{
VALUE v = (VALUE)n;
int s;
switch (v) {
case Qtrue: s = EXIT_SUCCESS; break;
case Qfalse: s = EXIT_FAILURE; break;
default:
if (!FIXNUM_P(v)) return TRUE;
s = FIX2INT(v);
}
if (status) *status = s;
return FALSE;
}
/*! Runs the given compiled source and exits this process.
* @retval 0 if successfully run the source
* @retval non-zero if an error occurred.
*/
int
ruby_run_node(void *n)
{
int status;
if (!ruby_executable_node(n, &status)) {
ruby_cleanup(0);
return status;
}
return ruby_cleanup(ruby_exec_node(n));
}
/*! Runs the given compiled source */
int
ruby_exec_node(void *n)
{
ruby_init_stack((void *)&n);
return ruby_exec_internal(n);
}
/*
* call-seq:
* Module.nesting -> array
*
* Returns the list of +Modules+ nested at the point of call.
*
* module M1
* module M2
* $a = Module.nesting
* end
* end
* $a #=> [M1::M2, M1]
* $a[0].name #=> "M1::M2"
*/
static VALUE
rb_mod_nesting(void)
{
VALUE ary = rb_ary_new();
const rb_cref_t *cref = rb_vm_cref();
while (cref && CREF_NEXT(cref)) {
VALUE klass = CREF_CLASS(cref);
if (!CREF_PUSHED_BY_EVAL(cref) &&
!NIL_P(klass)) {
rb_ary_push(ary, klass);
}
cref = CREF_NEXT(cref);
}
return ary;
}
/*
* call-seq:
* Module.constants -> array
* Module.constants(inherited) -> array
*
* In the first form, returns an array of the names of all
* constants accessible from the point of call.
* This list includes the names of all modules and classes
* defined in the global scope.
*
* Module.constants.first(4)
* # => [:ARGF, :ARGV, :ArgumentError, :Array]
*
* Module.constants.include?(:SEEK_SET) # => false
*
* class IO
* Module.constants.include?(:SEEK_SET) # => true
* end
*
* The second form calls the instance method +constants+.
*/
static VALUE
rb_mod_s_constants(int argc, VALUE *argv, VALUE mod)
{
const rb_cref_t *cref = rb_vm_cref();
VALUE klass;
VALUE cbase = 0;
void *data = 0;
if (argc > 0 || mod != rb_cModule) {
return rb_mod_constants(argc, argv, mod);
}
while (cref) {
klass = CREF_CLASS(cref);
if (!CREF_PUSHED_BY_EVAL(cref) &&
!NIL_P(klass)) {
data = rb_mod_const_at(CREF_CLASS(cref), data);
if (!cbase) {
cbase = klass;
}
}
cref = CREF_NEXT(cref);
}
if (cbase) {
data = rb_mod_const_of(cbase, data);
}
return rb_const_list(data);
}
/*!
* Asserts that \a klass is not a frozen class.
* \param[in] klass a \c Module object
* \exception RuntimeError if \a klass is not a class or frozen.
* \ingroup class
*/
void
rb_frozen_class_p(VALUE klass)
{
if (SPECIAL_CONST_P(klass)) {
noclass:
Check_Type(klass, T_CLASS);
}
if (OBJ_FROZEN(klass)) {
const char *desc;
if (FL_TEST(klass, FL_SINGLETON)) {
desc = "object";
klass = rb_ivar_get(klass, id__attached__);
if (!SPECIAL_CONST_P(klass)) {
switch (BUILTIN_TYPE(klass)) {
case T_MODULE:
case T_ICLASS:
desc = "Module";
break;
case T_CLASS:
desc = "Class";
break;
}
}
}
else {
switch (BUILTIN_TYPE(klass)) {
case T_MODULE:
case T_ICLASS:
desc = "module";
break;
case T_CLASS:
desc = "class";
break;
default:
goto noclass;
}
}
rb_error_frozen(desc);
}
}
NORETURN(static void rb_longjmp(rb_execution_context_t *, int, volatile VALUE, VALUE));
static VALUE get_errinfo(void);
static VALUE get_ec_errinfo(const rb_execution_context_t *ec);
static VALUE
exc_setup_cause(VALUE exc, VALUE cause)
{
#if SUPPORT_JOKE
if (NIL_P(cause)) {
ID id_true_cause;
CONST_ID(id_true_cause, "true_cause");
cause = rb_attr_get(rb_eFatal, id_true_cause);
if (NIL_P(cause)) {
cause = rb_exc_new_cstr(rb_eFatal, "because using such Ruby");
rb_ivar_set(cause, id_cause, INT2FIX(42)); /* the answer */
OBJ_FREEZE(cause);
rb_ivar_set(rb_eFatal, id_true_cause, cause);
}
}
#endif
if (!NIL_P(cause) && cause != exc) {
rb_ivar_set(exc, id_cause, cause);
if (!rb_ivar_defined(cause, id_cause)) {
rb_ivar_set(cause, id_cause, Qnil);
}
}
return exc;
}
static inline VALUE
exc_setup_message(const rb_execution_context_t *ec, VALUE mesg, VALUE *cause)
{
int nocause = 0;
if (NIL_P(mesg)) {
mesg = ec->errinfo;
if (INTERNAL_EXCEPTION_P(mesg)) EC_JUMP_TAG(ec, TAG_FATAL);
nocause = 1;
}
if (NIL_P(mesg)) {
mesg = rb_exc_new(rb_eRuntimeError, 0, 0);
nocause = 0;
}
if (*cause == Qundef) {
if (nocause) {
*cause = Qnil;
}
else if (!rb_ivar_defined(mesg, id_cause)) {
*cause = get_ec_errinfo(ec);
}
}
return mesg;
}
static void
setup_exception(rb_execution_context_t *ec, int tag, volatile VALUE mesg, VALUE cause)
{
VALUE e;
const char *file = 0;
int line;
file = rb_source_location_cstr(&line);
if ((file && !NIL_P(mesg)) || (cause != Qundef)) {
volatile int state = 0;
EC_PUSH_TAG(ec);
if (EC_EXEC_TAG() == TAG_NONE && !(state = rb_ec_set_raised(ec))) {
VALUE bt = rb_get_backtrace(mesg);
if (!NIL_P(bt) || cause == Qundef) {
if (OBJ_FROZEN(mesg)) {
mesg = rb_obj_dup(mesg);
}
}
if (cause != Qundef) {
exc_setup_cause(mesg, cause);
}
if (NIL_P(bt)) {
VALUE at = rb_ec_backtrace_object(ec);
rb_ivar_set(mesg, idBt_locations, at);
set_backtrace(mesg, at);
}
rb_ec_reset_raised(ec);
}
EC_POP_TAG();
if (state) goto fatal;
}
if (!NIL_P(mesg)) {
ec->errinfo = mesg;
}
if (RTEST(ruby_debug) && !NIL_P(e = ec->errinfo) &&
!rb_obj_is_kind_of(e, rb_eSystemExit)) {
enum ruby_tag_type state;
mesg = e;
EC_PUSH_TAG(ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
ec->errinfo = Qnil;
e = rb_obj_as_string(mesg);
ec->errinfo = mesg;
if (file && line) {
e = rb_sprintf("Exception `%"PRIsVALUE"' at %s:%d - %"PRIsVALUE"\n",
rb_obj_class(mesg), file, line, e);
}
else if (file) {
e = rb_sprintf("Exception `%"PRIsVALUE"' at %s - %"PRIsVALUE"\n",
rb_obj_class(mesg), file, e);
}
else {
e = rb_sprintf("Exception `%"PRIsVALUE"' - %"PRIsVALUE"\n",
rb_obj_class(mesg), e);
}
warn_print_str(e);
}
EC_POP_TAG();
if (state == TAG_FATAL && ec->errinfo == exception_error) {
ec->errinfo = mesg;
}
else if (state) {
rb_ec_reset_raised(ec);
EC_JUMP_TAG(ec, state);
}
}
if (rb_ec_set_raised(ec)) {
fatal:
ec->errinfo = exception_error;
rb_ec_reset_raised(ec);
EC_JUMP_TAG(ec, TAG_FATAL);
}
if (tag != TAG_FATAL) {
RUBY_DTRACE_HOOK(RAISE, rb_obj_classname(ec->errinfo));
EXEC_EVENT_HOOK(ec, RUBY_EVENT_RAISE, ec->cfp->self, 0, 0, 0, mesg);
}
}
/*! \private */
void
rb_ec_setup_exception(const rb_execution_context_t *ec, VALUE mesg, VALUE cause)
{
if (cause == Qundef) {
cause = get_ec_errinfo(ec);
}
if (cause != mesg) {
rb_ivar_set(mesg, id_cause, cause);
}
}
static void
rb_longjmp(rb_execution_context_t *ec, int tag, volatile VALUE mesg, VALUE cause)
{
mesg = exc_setup_message(ec, mesg, &cause);
setup_exception(ec, tag, mesg, cause);
rb_ec_raised_clear(ec);
EC_JUMP_TAG(ec, tag);
}
static VALUE make_exception(int argc, const VALUE *argv, int isstr);
/*!
* Raises an exception in the current thread.
* \param[in] mesg an Exception class or an \c Exception object.
* \exception always raises an instance of the given exception class or
* the given \c Exception object.
* \ingroup exception
*/
void
rb_exc_raise(VALUE mesg)
{
if (!NIL_P(mesg)) {
mesg = make_exception(1, &mesg, FALSE);
}
rb_longjmp(GET_EC(), TAG_RAISE, mesg, Qundef);
}
/*!
* Raises a fatal error in the current thread.
*
* Same as rb_exc_raise() but raises a fatal error, which Ruby codes
* cannot rescue.
* \ingroup exception
*/
void
rb_exc_fatal(VALUE mesg)
{
if (!NIL_P(mesg)) {
mesg = make_exception(1, &mesg, FALSE);
}
rb_longjmp(GET_EC(), TAG_FATAL, mesg, Qnil);
}
/*!
* Raises an \c Interrupt exception.
* \ingroup exception
*/
void
rb_interrupt(void)
{
rb_exc_raise(rb_exc_new(rb_eInterrupt, 0, 0));
}
enum {raise_opt_cause, raise_max_opt}; /*< \private */
static int
extract_raise_opts(int argc, const VALUE *argv, VALUE *opts)
{
int i;
if (argc > 0) {
VALUE opt = argv[argc-1];
if (RB_TYPE_P(opt, T_HASH)) {
if (!RHASH_EMPTY_P(opt)) {
ID keywords[1];
CONST_ID(keywords[0], "cause");
rb_get_kwargs(opt, keywords, 0, -1-raise_max_opt, opts);
if (RHASH_EMPTY_P(opt)) --argc;
return argc;
}
}
}
for (i = 0; i < raise_max_opt; ++i) {
opts[i] = Qundef;
}
return argc;
}
/*
* call-seq:
* raise
* raise(string)
* raise(exception [, string [, array]])
* fail
* fail(string)
* fail(exception [, string [, array]])
*
* With no arguments, raises the exception in <code>$!</code> or raises
* a <code>RuntimeError</code> if <code>$!</code> is +nil+.
* With a single +String+ argument, raises a
* +RuntimeError+ with the string as a message. Otherwise,
* the first parameter should be the name of an +Exception+
* class (or an object that returns an +Exception+ object when sent
* an +exception+ message). The optional second parameter sets the
* message associated with the exception, and the third parameter is an
* array of callback information. Exceptions are caught by the
* +rescue+ clause of <code>begin...end</code> blocks.
*
* raise "Failed to create socket"
* raise ArgumentError, "No parameters", caller
*/
static VALUE
rb_f_raise(int argc, VALUE *argv)
{
VALUE err;
VALUE opts[raise_max_opt], *const cause = &opts[raise_opt_cause];
argc = extract_raise_opts(argc, argv, opts);
if (argc == 0) {
if (*cause != Qundef) {
rb_raise(rb_eArgError, "only cause is given with no arguments");
}
err = get_errinfo();
if (!NIL_P(err)) {
argc = 1;
argv = &err;
}
}
rb_raise_jump(rb_make_exception(argc, argv), *cause);
UNREACHABLE;
}
static VALUE
make_exception(int argc, const VALUE *argv, int isstr)
{
VALUE mesg, exc;
int n;
mesg = Qnil;
switch (argc) {
case 0:
break;
case 1:
exc = argv[0];
if (NIL_P(exc))
break;
if (isstr) {
mesg = rb_check_string_type(exc);
if (!NIL_P(mesg)) {
mesg = rb_exc_new3(rb_eRuntimeError, mesg);
break;
}
}
n = 0;
goto exception_call;
case 2:
case 3:
exc = argv[0];
n = 1;
exception_call:
mesg = rb_check_funcall(exc, idException, n, argv+1);
if (mesg == Qundef) {
rb_raise(rb_eTypeError, "exception class/object expected");
}
break;
default:
rb_check_arity(argc, 0, 3);
break;
}
if (argc > 0) {
if (!rb_obj_is_kind_of(mesg, rb_eException))
rb_raise(rb_eTypeError, "exception object expected");
if (argc > 2)
set_backtrace(mesg, argv[2]);
}
return mesg;
}
/*!
* Make an \c Exception object from the list of arguments in a manner
* similar to \c Kernel\#raise.
*
* \param[in] argc the number of arguments
* \param[in] argv a pointer to the array of arguments.
*
* The first form of this function takes a \c String argument. Then
* it returns a \c RuntimeError whose error message is the given value.
*
* The second from of this function takes an \c Exception object. Then
* it just returns the given value.
*
* The last form takes an exception class, an optional error message and
* an optional array of backtrace. Then it passes the optional arguments
* to \c #exception method of the exception class.
*
* \return the exception object, or \c Qnil if \c argc is 0.
* \ingroup exception
*/
VALUE
rb_make_exception(int argc, const VALUE *argv)
{
return make_exception(argc, argv, TRUE);
}
/*! \private
* \todo can be static?
*/
void
rb_raise_jump(VALUE mesg, VALUE cause)
{
rb_execution_context_t *ec = GET_EC();
const rb_control_frame_t *cfp = ec->cfp;
const rb_callable_method_entry_t *me = rb_vm_frame_method_entry(cfp);
VALUE klass = me->owner;
VALUE self = cfp->self;
ID mid = me->called_id;
rb_vm_pop_frame(ec);
EXEC_EVENT_HOOK(ec, RUBY_EVENT_C_RETURN, self, me->def->original_id, mid, klass, Qnil);
rb_longjmp(ec, TAG_RAISE, mesg, cause);
}
/*!
* Continues the exception caught by rb_protect() and rb_eval_string_protect().
*
* This function never return to the caller.
* \param[in] the value of \c *state which the protect function has set to the
* their last parameter.
* \ingroup exception
*/
void
rb_jump_tag(int tag)
{
if (UNLIKELY(tag < TAG_RETURN || tag > TAG_FATAL)) {
unknown_longjmp_status(tag);
}
EC_JUMP_TAG(GET_EC(), tag);
}
/*! Determines if the current method is given a block.
* \retval zero if not given
* \retval non-zero if given
* \ingroup defmethod
*/
int
rb_block_given_p(void)
{
if (rb_vm_frame_block_handler(GET_EC()->cfp) == VM_BLOCK_HANDLER_NONE) {
return FALSE;
}
else {
return TRUE;
}
}
VALUE rb_eThreadError;
/*! Declares that the current method needs a block.
*
* Raises a \c LocalJumpError if not given a block.
* \ingroup defmethod
*/
void
rb_need_block(void)
{
if (!rb_block_given_p()) {
rb_vm_localjump_error("no block given", Qnil, 0);
}
}
/*! An equivalent of \c rescue clause.
*
* Equivalent to <code>begin .. rescue err_type .. end</code>
*
* \param[in] b_proc a function which potentially raises an exception.
* \param[in] data1 the argument of \a b_proc
* \param[in] r_proc a function which rescues an exception in \a b_proc.
* \param[in] data2 the first argument of \a r_proc
* \param[in] ... 1 or more exception classes. Must be terminated by \c (VALUE)0.
*
* First it calls the function \a b_proc, with \a data1 as the argument.
* When \a b_proc raises an exception, it calls \a r_proc with \a data2 and
* the exception object if the exception is a kind of one of the given
* exception classes.
*
* \return the return value of \a b_proc if no exception occurs,
* or the return value of \a r_proc if otherwise.
* \sa rb_rescue
* \sa rb_ensure
* \sa rb_protect
* \ingroup exception
*/
VALUE
rb_rescue2(VALUE (* b_proc) (ANYARGS), VALUE data1,
VALUE (* r_proc) (ANYARGS), VALUE data2, ...)
{
enum ruby_tag_type state;
rb_execution_context_t * volatile ec = GET_EC();
rb_control_frame_t *volatile cfp = ec->cfp;
volatile VALUE result = Qfalse;
volatile VALUE e_info = ec->errinfo;
va_list args;
EC_PUSH_TAG(ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
retry_entry:
result = (*b_proc) (data1);
}
else if (result) {
/* escape from r_proc */
if (state == TAG_RETRY) {
state = 0;
ec->errinfo = Qnil;
result = Qfalse;
goto retry_entry;
}
}
else {
rb_vm_rewind_cfp(ec, cfp);
if (state == TAG_RAISE) {
int handle = FALSE;
VALUE eclass;
va_init_list(args, data2);
while ((eclass = va_arg(args, VALUE)) != 0) {
if (rb_obj_is_kind_of(ec->errinfo, eclass)) {
handle = TRUE;
break;
}
}
va_end(args);
if (handle) {
result = Qnil;
state = 0;
if (r_proc) {
result = (*r_proc) (data2, ec->errinfo);
}
ec->errinfo = e_info;
}
}
}
EC_POP_TAG();
if (state)
EC_JUMP_TAG(ec, state);
return result;
}
/*! An equivalent of \c rescue clause.
*
* Equivalent to <code>begin .. rescue .. end</code>.
*
* It is same as
* \code{cpp}
* rb_rescue2(b_proc, data1, r_proc, data2, rb_eStandardError, (VALUE)0);
* \endcode
*
* \sa rb_rescue2
* \sa rb_ensure
* \sa rb_protect
* \ingroup exception
*/
VALUE
rb_rescue(VALUE (* b_proc)(ANYARGS), VALUE data1,
VALUE (* r_proc)(ANYARGS), VALUE data2)
{
return rb_rescue2(b_proc, data1, r_proc, data2, rb_eStandardError,
(VALUE)0);
}
/*! Protects a function call from potential global escapes from the function.
*
* Such global escapes include exceptions, \c Kernel\#throw, \c break in
* an iterator, for example.
* It first calls the function func with arg as the argument.
* If no exception occurred during func, it returns the result of func and
* *state is zero.
* Otherwise, it returns Qnil and sets *state to nonzero.
* If state is NULL, it is not set in both cases.
*
* You have to clear the error info with rb_set_errinfo(Qnil) when
* ignoring the caught exception.
* \ingroup exception
* \sa rb_rescue
* \sa rb_rescue2
* \sa rb_ensure
*/
VALUE
rb_protect(VALUE (* proc) (VALUE), VALUE data, int *pstate)
{
volatile VALUE result = Qnil;
volatile enum ruby_tag_type state;
rb_execution_context_t * volatile ec = GET_EC();
rb_control_frame_t *volatile cfp = ec->cfp;