/
sub.pmc
1207 lines (854 loc) · 35.3 KB
/
sub.pmc
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
/*
Copyright (C) 2001-2012, Parrot Foundation.
=head1 NAME
src/pmc/sub.pmc - Subroutine
=head1 DESCRIPTION
These are the vtable functions for the Sub (subroutine) base class
=head2 Functions
=over 4
=cut
*/
#include "parrot/oplib/ops.h"
#include "parrot/oplib/core_ops.h"
#include "sub.str"
/* HEADERIZER HFILE: none */
/* HEADERIZER BEGIN: static */
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
static void print_sub_name(PARROT_INTERP, ARGIN_NULLOK(PMC *sub))
__attribute__nonnull__(1);
#define ASSERT_ARGS_print_sub_name __attribute__unused__ int _ASSERT_ARGS_CHECK = (\
PARROT_ASSERT_ARG(interp))
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
/* HEADERIZER END: static */
/*
=item C<static void print_sub_name(PARROT_INTERP, PMC *sub)>
static function to print the name of the sub (for tracing/debugging)
=cut
*/
static void
print_sub_name(PARROT_INTERP, ARGIN_NULLOK(PMC *sub))
{
ASSERT_ARGS(print_sub_name)
Interp * const tracer = (interp->pdb && interp->pdb->debugger)
? interp->pdb->debugger
: interp;
/* sub was located via globals */
Parrot_io_eprintf(tracer, "# Calling sub '%Ss'\n# ",
Parrot_sub_full_sub_name(interp, sub));
print_pbc_location(interp);
}
pmclass Sub auto_attrs provides invokable {
ATTR PackFile_ByteCode *seg; /* bytecode segment */
ATTR size_t start_offs; /* sub entry in ops from seg->base.data */
ATTR size_t end_offs;
ATTR INTVAL HLL_id; /* see src/hll.c XXX or per segment? */
ATTR PMC *namespace_name; /* where this Sub is in - this is either
* a String or a [Key] and describes
* the relative path in the NameSpace
*/
ATTR PMC *namespace_stash; /* the actual hash, HLL::namespace */
ATTR STRING *name; /* name of the sub */
ATTR STRING *method_name; /* method name of the sub */
ATTR STRING *ns_entry_name; /* ns entry name of the sub */
ATTR STRING *subid; /* The ID of the sub. */
ATTR INTVAL vtable_index; /* index in Parrot_vtable_slot_names */
ATTR PMC *multi_signature; /* list of types for MMD */
ATTR UINTVAL n_regs_used[4]; /* INSP in PBC */
ATTR PMC *lex_info; /* LexInfo PMC */
ATTR PMC *outer_sub; /* :outer for closures */
ATTR PMC *ctx; /* the context this sub is in */
ATTR UINTVAL comp_flags; /* compile time and additional flags */
ATTR Parrot_sub_arginfo *arg_info; /* Argument counts and flags. */
ATTR PMC *outer_ctx; /* outer context, if a closure */
/*
=item C<void init()>
Initializes the subroutine.
=cut
*/
/*
* Sub PMC's flags usage:
* - private0 ... Coroutine flip/flop - C exception handler
* - private1 ... _IS_OUTER - have to preserve context
* as some other sub has :outer(this)
* - private2 ... tailcall invoked this Sub
* - private3 ... pythonic coroutine generator flag
* - private4 ... :main (originally @MAIN)
* - private5 ... :load (originally @LOAD)
* - private6 ... :immediate (originally @IMMEDIATE)
* - private7 ... :postcomp (originally @POSTCOMP)
*
* see also the enum in include/parrot/sub.h
*/
VTABLE void init() {
Parrot_Sub_attributes * const attrs =
PMC_data_typed(SELF, Parrot_Sub_attributes *);
attrs->seg = INTERP->code;
attrs->outer_sub = PMCNULL;
attrs->multi_signature = PMCNULL;
attrs->namespace_name = PMCNULL;
attrs->vtable_index = -1;
PObj_custom_mark_destroy_SETALL(SELF);
}
/*
=item C<void init_pmc()>
Initializes the "detached" subroutine from passed Hash. "Detached" means that
surboutine is fully constructed but not attached to interpreter.
=cut
*/
VTABLE void init_pmc(PMC* init) {
Parrot_Sub_attributes * const attrs =
PMC_data_typed(SELF, Parrot_Sub_attributes *);
STRING *field = CONST_STRING(INTERP, "start_offs");
if (VTABLE_exists_keyed_str(INTERP, init, field))
attrs->start_offs = VTABLE_get_integer_keyed_str(INTERP, init, field);
field = CONST_STRING(INTERP, "end_offs");
if (VTABLE_exists_keyed_str(INTERP, init, field))
attrs->end_offs = VTABLE_get_integer_keyed_str(INTERP, init, field);
field = CONST_STRING(INTERP, "HLL_id");
if (VTABLE_exists_keyed_str(INTERP, init, field))
attrs->HLL_id = VTABLE_get_integer_keyed_str(INTERP, init, field);
field = CONST_STRING(INTERP, "namespace_name");
if (VTABLE_exists_keyed_str(INTERP, init, field))
attrs->namespace_name = VTABLE_get_pmc_keyed_str(INTERP, init, field);
field = CONST_STRING(INTERP, "namespace_stash");
if (VTABLE_exists_keyed_str(INTERP, init, field))
attrs->namespace_stash = VTABLE_get_pmc_keyed_str(INTERP, init, field);
field = CONST_STRING(INTERP, "name");
if (VTABLE_exists_keyed_str(INTERP, init, field))
attrs->name = VTABLE_get_string_keyed_str(INTERP, init, field);
field = CONST_STRING(INTERP, "method_name");
if (VTABLE_exists_keyed_str(INTERP, init, field))
attrs->method_name = VTABLE_get_string_keyed_str(INTERP, init, field);
field = CONST_STRING(INTERP, "ns_entry_name");
if (VTABLE_exists_keyed_str(INTERP, init, field))
attrs->ns_entry_name = VTABLE_get_string_keyed_str(INTERP, init, field);
field = CONST_STRING(INTERP, "subid");
if (VTABLE_exists_keyed_str(INTERP, init, field))
attrs->subid = VTABLE_get_string_keyed_str(INTERP, init, field);
field = CONST_STRING(INTERP, "vtable_index");
if (VTABLE_exists_keyed_str(INTERP, init, field))
attrs->vtable_index = VTABLE_get_integer_keyed_str(INTERP, init, field);
else
attrs->vtable_index = -1;
field = CONST_STRING(INTERP, "multi_signature");
if (VTABLE_exists_keyed_str(INTERP, init, field))
attrs->multi_signature = VTABLE_get_pmc_keyed_str(INTERP, init, field);
field = CONST_STRING(INTERP, "lex_info");
if (VTABLE_exists_keyed_str(INTERP, init, field))
attrs->lex_info = VTABLE_get_pmc_keyed_str(INTERP, init, field);
field = CONST_STRING(INTERP, "outer_sub");
if (VTABLE_exists_keyed_str(INTERP, init, field))
attrs->outer_sub = VTABLE_get_pmc_keyed_str(INTERP, init, field);
/* comp_flags is actually UINTVAL */
field = CONST_STRING(INTERP, "comp_flags");
if (VTABLE_exists_keyed_str(INTERP, init, field)) {
const UINTVAL flags = (UINTVAL)VTABLE_get_integer_keyed_str(INTERP, init, field);
/* Mask comp flags only */
attrs->comp_flags = flags & SUB_COMP_FLAG_MASK;
}
/* In order to create Sub dynamicaly we have to set PObj flags */
field = CONST_STRING(INTERP, "pf_flags");
if (VTABLE_exists_keyed_str(INTERP, init, field)) {
const UINTVAL flags = (UINTVAL)VTABLE_get_integer_keyed_str(INTERP, init, field);
/* Mask Sub specific flags only */
PObj_get_FLAGS(SELF) |= flags & SUB_FLAG_PF_MASK;
}
field = CONST_STRING(INTERP, "n_regs_used");
if (VTABLE_exists_keyed_str(INTERP, init, field)) {
PMC * const tmp = VTABLE_get_pmc_keyed_str(INTERP, init, field);
INTVAL i;
for (i = 0; i < 4; ++i)
attrs->n_regs_used[i] = VTABLE_get_integer_keyed_int(INTERP, tmp, i);
}
field = CONST_STRING(INTERP, "arg_info");
if (VTABLE_exists_keyed_str(INTERP, init, field)) {
PMC * const tmp = VTABLE_get_pmc_keyed_str(INTERP, init, field);
/* Allocate structure to store argument information in. */
attrs->arg_info = mem_gc_allocate_zeroed_typed(INTERP,
Parrot_sub_arginfo);
/*
Hash.get_integer_keyed_str return 0 if key doesn't exists.
So, don't check existence of key, just use it.
NB: Don't split line. CONST_STRING b0rked.
*/
attrs->arg_info->pos_required = VTABLE_get_integer_keyed_str(INTERP, tmp, CONST_STRING(INTERP, "pos_required"));
attrs->arg_info->pos_optional = VTABLE_get_integer_keyed_str(INTERP, tmp, CONST_STRING(INTERP, "pos_optional"));
attrs->arg_info->pos_slurpy = VTABLE_get_integer_keyed_str(INTERP, tmp, CONST_STRING(INTERP, "pos_slurpy"));
attrs->arg_info->named_required = VTABLE_get_integer_keyed_str(INTERP, tmp, CONST_STRING(INTERP, "named_required"));
attrs->arg_info->named_optional = VTABLE_get_integer_keyed_str(INTERP, tmp, CONST_STRING(INTERP, "named_optional"));
attrs->arg_info->named_slurpy = VTABLE_get_integer_keyed_str(INTERP, tmp, CONST_STRING(INTERP, "named_slurpy"));
}
/* C<ctx> not handled here, and shouldn't be, because of run-time nature. */
PObj_custom_mark_destroy_SETALL(SELF);
}
/*
=item C<void destroy()>
Destroys the subroutine.
=cut
*/
VTABLE void destroy() {
Parrot_Sub_attributes * const sub = PARROT_SUB(SELF);
if (sub && sub->arg_info)
mem_gc_free(INTERP, sub->arg_info);
}
/*
=item C<STRING *get_string()>
Returns the name of the subroutine.
=item C<void set_string_native(STRING *subname)>
Sets the name of the subroutine.
=cut
*/
VTABLE STRING *get_string() {
STRING *name;
GET_ATTR_name(INTERP, SELF, name);
return name;
}
VTABLE void set_string_native(STRING *subname) {
SET_ATTR_name(INTERP, SELF, subname);
}
/*
=item C<void set_pointer(void *value)>
Sets the pointer to the actual subroutine.
*** Don't use that - use C<.const 'Sub'> in PIR instead ***
=cut
*/
VTABLE void set_pointer(void *value) {
UNUSED(value)
Parrot_ex_throw_from_c_args(INTERP, NULL, EXCEPTION_INVALID_OPERATION,
"Don't set the address of a sub\nuse .const 'Sub' instead");
}
/*
=item C<void *get_pointer()>
Returns the address of the actual subroutine.
=cut
*/
VTABLE void *get_pointer() {
Parrot_Sub_attributes *sub;
PMC_get_sub(INTERP, SELF, sub);
return sub->seg->base.data + sub->start_offs;
}
/*
=item C<INTVAL get_integer_keyed(PMC *key)>
I<This just unconditionally returns the start of bytecode. It's wrong,
wrong, wrong, *WRONG*. And there's no other good way, so it's here for
now.> -DRS
=cut
*/
VTABLE INTVAL get_integer_keyed(PMC *key) {
UNUSED(key)
Parrot_Sub_attributes *sub;
PMC_get_sub(INTERP, SELF, sub);
return (INTVAL) (sub->seg->base.data);
}
/*
=item C<INTVAL defined()>
=item C<INTVAL get_bool()>
Returns True.
=cut
*/
VTABLE INTVAL defined() {
return 1;
}
VTABLE INTVAL get_bool() {
return 1;
}
/*
=item C<opcode_t *invoke(void *next)>
Invokes the subroutine.
=cut
*/
VTABLE opcode_t *invoke(void *next) {
PMC * const caller_ctx = CURRENT_CONTEXT(INTERP);
PMC *ccont = INTERP->current_cont;
/* plain subroutine call
* create new context, place it in interpreter */
PMC *context = Parrot_pcc_get_signature(INTERP, caller_ctx);
Parrot_Sub_attributes *sub;
opcode_t *pc;
PMC_get_sub(INTERP, SELF, sub);
if (Interp_trace_TEST(INTERP, PARROT_TRACE_SUB_CALL_FLAG))
print_sub_name(INTERP, SELF);
/*
* A remark WRT tail calls
*
* we have:
* sub A:
* ...
* B()
* ...
* sub B:
* ...
* .return C(...)
*
* that is the sub B() returns whatever C() returns.
*
* We are just calling the sub C().
* If the private2 flag is set, this code is called by a
* tailcall opcode.
*
* We allocate a new register frame and recycle it
* immediately after argument passing.
*
*/
pc = sub->seg->base.data + sub->start_offs;
INTERP->current_cont = NULL;
PARROT_ASSERT(!PMC_IS_NULL(ccont));
if (PMC_IS_NULL(context))
context = Parrot_pmc_new(INTERP, enum_class_CallContext);
Parrot_pcc_set_context(INTERP, context);
Parrot_pcc_set_caller_ctx(INTERP, context, caller_ctx);
/* support callcontext reuse */
if (context == caller_ctx)
Parrot_pcc_free_registers(INTERP, context);
Parrot_pcc_allocate_registers(INTERP, context, sub->n_regs_used);
Parrot_pcc_init_context(INTERP, context, caller_ctx);
Parrot_pcc_set_sub(INTERP, context, SELF);
Parrot_pcc_set_continuation(INTERP, context, ccont);
Parrot_pcc_set_constants(INTERP, context, sub->seg->const_table);
/* check recursion/call depth */
if (Parrot_pcc_inc_recursion_depth(INTERP, context) > INTERP->recursion_limit)
Parrot_ex_throw_from_c_args(INTERP, next, EXCEPTION_INTERNAL_PANIC,
"maximum recursion depth exceeded");
/* and copy set context variables */
PARROT_GC_WRITE_BARRIER(interp, ccont);
PARROT_CONTINUATION(ccont)->from_ctx = context;
/* if this is an outer sub, then we need to set sub->ctx
* to the new context */
if (PObj_get_FLAGS(SELF) & SUB_FLAG_IS_OUTER) {
PARROT_GC_WRITE_BARRIER(interp, SELF);
sub->ctx = context;
}
/* create pad if needed
* TODO move this up in front of argument passing
* and factor out common code with coroutine pmc
*/
if (!PMC_IS_NULL(sub->lex_info)) {
Parrot_pcc_set_lex_pad(INTERP, context, Parrot_pmc_new_init(INTERP,
Parrot_hll_get_ctx_HLL_type(INTERP, enum_class_LexPad),
sub->lex_info));
VTABLE_set_pointer(INTERP, Parrot_pcc_get_lex_pad(INTERP, context), context);
}
/* set outer context */
if (!PMC_IS_NULL(sub->outer_ctx))
Parrot_pcc_set_outer_ctx(INTERP, context, sub->outer_ctx);
else {
/* autoclose */
PMC *c = context;
PMC *outer_c = Parrot_pcc_get_outer_ctx(INTERP, c);
for (c = context;
PMC_IS_NULL(outer_c);
c = outer_c, outer_c = Parrot_pcc_get_outer_ctx(INTERP, c)) {
PMC *outer_pmc;
Parrot_Sub_attributes *current_sub, *outer_sub;
PMC_get_sub(INTERP, Parrot_pcc_get_sub(INTERP, c), current_sub);
outer_pmc = current_sub->outer_sub;
if (PMC_IS_NULL(outer_pmc))
break;
PMC_get_sub(INTERP, outer_pmc, outer_sub);
if (PMC_IS_NULL(outer_sub->ctx)) {
PMC * const dummy = Parrot_alloc_context(INTERP,
outer_sub->n_regs_used, PMCNULL);
Parrot_pcc_set_sub(INTERP, dummy, outer_pmc);
if (!PMC_IS_NULL(outer_sub->lex_info)) {
Parrot_pcc_set_lex_pad(INTERP, dummy,
Parrot_pmc_new_init(INTERP,
Parrot_hll_get_ctx_HLL_type(INTERP,
enum_class_LexPad), outer_sub->lex_info));
VTABLE_set_pointer(INTERP,
Parrot_pcc_get_lex_pad(INTERP, dummy), dummy);
}
if (!PMC_IS_NULL(outer_sub->outer_ctx))
Parrot_pcc_set_outer_ctx(INTERP, dummy,
outer_sub->outer_ctx);
PARROT_GC_WRITE_BARRIER(interp, outer_pmc);
outer_sub->ctx = dummy;
}
Parrot_pcc_set_outer_ctx(INTERP, c, outer_sub->ctx);
outer_c = outer_sub->ctx;
}
}
/* switch code segment if needed */
if (INTERP->code != sub->seg)
Parrot_switch_to_cs(INTERP, sub->seg, 1);
return pc;
}
/*
=item C<PMC *clone()>
Creates and returns a clone of the subroutine.
=cut
*/
VTABLE PMC *clone() {
PMC * const ret = Parrot_pmc_new(INTERP, SELF->vtable->base_type);
Parrot_Sub_attributes *dest_sub;
Parrot_Sub_attributes *sub;
/* XXX Why? */
/* we have to mark it ourselves */
PObj_custom_mark_destroy_SETALL(ret);
PMC_get_sub(INTERP, SELF, dest_sub);
PMC_get_sub(INTERP, ret, sub);
/* first set the sub struct, Parrot_str_copy may cause GC */
*sub = *dest_sub;
/* Be sure not to share arg_info. */
dest_sub->arg_info = NULL;
return ret;
}
/*
=item C<void assign_pmc(PMC *other)>
Set SELF to the data in other.
=cut
*/
VTABLE void set_pmc(PMC *other) {
SELF.assign_pmc(other);
}
VTABLE void assign_pmc(PMC *other) {
/* only handle the case where the other PMC is the same type */
if (other->vtable->base_type == SELF->vtable->base_type) {
Parrot_Sub_attributes *my_sub;
Parrot_Sub_attributes *other_sub;
PMC_get_sub(INTERP, SELF, my_sub);
PMC_get_sub(INTERP, other, other_sub);
/* copy the sub struct */
memmove(my_sub, other_sub, sizeof (Parrot_Sub_attributes));
}
else
Parrot_ex_throw_from_c_args(INTERP, NULL,
EXCEPTION_INVALID_OPERATION,
"Can't assign a non-Sub type to a Sub");
}
/*
=item C<void mark()>
Marks the sub as live.
=cut
*/
VTABLE void mark() {
Parrot_Sub_attributes * const sub = PARROT_SUB(SELF);
if (!sub)
return;
Parrot_gc_mark_STRING_alive(INTERP, sub->name);
Parrot_gc_mark_STRING_alive(INTERP, sub->subid);
Parrot_gc_mark_STRING_alive(INTERP, sub->method_name);
Parrot_gc_mark_STRING_alive(INTERP, sub->ns_entry_name);
Parrot_gc_mark_PMC_alive(INTERP, sub->ctx);
Parrot_gc_mark_PMC_alive(INTERP, sub->lex_info);
Parrot_gc_mark_PMC_alive(INTERP, sub->outer_ctx);
Parrot_gc_mark_PMC_alive(INTERP, sub->outer_sub);
Parrot_gc_mark_PMC_alive(INTERP, sub->namespace_name);
Parrot_gc_mark_PMC_alive(INTERP, sub->multi_signature);
Parrot_gc_mark_PMC_alive(INTERP, sub->namespace_stash);
/* XXX
* Workaround for things that subclass sub but don't point into packfiles
* (eg: EventHandler)
* TODO: use inheritance properly to avoid this
*/
if (sub->seg)
Parrot_gc_mark_PMC_alive(INTERP, sub->seg->base.pf->view);
}
/*
=item C<INTVAL is_equal(PMC *value)>
Returns whether the two subroutines are equal.
=cut
*/
MULTI INTVAL is_equal(PMC *value) {
Parrot_Sub_attributes *my_sub, *value_sub;
PMC_get_sub(INTERP, SELF, my_sub);
PMC_get_sub(INTERP, value, value_sub);
return SELF->vtable == value->vtable
&& (my_sub)->start_offs == (value_sub)->start_offs
&& (my_sub)->seg == (value_sub)->seg;
}
/*
=item C<void visit(PMC *info)>
This is used by freeze/thaw to visit the contents of the sub.
=item C<void freeze(PMC *info)>
Archives the subroutine.
=cut
*/
VTABLE void visit(PMC *info) {
VISIT_PMC_ATTR(INTERP, info, SELF, Sub, namespace_name);
VISIT_PMC_ATTR(INTERP, info, SELF, Sub, multi_signature);
VISIT_PMC_ATTR(INTERP, info, SELF, Sub, outer_sub);
/*
* XXX visit_pmc_now is wrong, because it breaks
* depth-first visit inside the todo list
* TODO change all user visit functions to use
* visit_pmc (the todo renamed visit_pm_later)
*
* Therefore the hash must be last during visit for now.
*/
VISIT_PMC_ATTR(INTERP, info, SELF, Sub, lex_info);
SUPER(info);
}
VTABLE void freeze(PMC *info) {
Parrot_Sub_attributes *sub;
STRING *hll_name;
int i;
SUPER(info);
PMC_get_sub(INTERP, SELF, sub);
/*
* we currently need to write these items:
* - start offset in byte-code segment
* - end offset in byte-code segment
* - segment TODO ???
* - flags (i.e. :load pragma and such)
* - name of the sub's label
* - method name
* - ns entry name
* - namespace
* - HLL_id
* - multi_signature
* - n_regs_used[i]
* - lex_info
* - vtable_index
* - subid
*/
VTABLE_push_integer(INTERP, info, (INTVAL) sub->start_offs);
VTABLE_push_integer(INTERP, info, (INTVAL) sub->end_offs);
VTABLE_push_integer(INTERP, info,
(INTVAL)(PObj_get_FLAGS(SELF) & SUB_FLAG_PF_MASK));
VTABLE_push_string(INTERP, info, sub->name);
if (!sub->method_name)
sub->method_name = CONST_STRING(INTERP, "");
VTABLE_push_string(INTERP, info, sub->method_name);
if (!sub->ns_entry_name)
sub->ns_entry_name = CONST_STRING(INTERP, "");
VTABLE_push_string(INTERP, info, sub->ns_entry_name);
hll_name = Parrot_hll_get_HLL_name(INTERP, sub->HLL_id);
if (!hll_name)
hll_name = CONST_STRING(INTERP, "");
VTABLE_push_string(INTERP, info, hll_name);
VTABLE_push_integer(INTERP, info, (INTVAL)sub->comp_flags);
VTABLE_push_integer(INTERP, info, sub->vtable_index);
for (i = 0; i < 4; ++i)
VTABLE_push_integer(INTERP, info, sub->n_regs_used[i]);
if (!sub->subid)
sub->subid = CONST_STRING(INTERP, "");
VTABLE_push_string(INTERP, info, sub->subid);
}
/*
=item C<void thaw(PMC *info)>
Unarchives the subroutine.
=cut
*/
VTABLE void thaw(PMC *info) {
Parrot_Sub_attributes *sub;
INTVAL flags;
int i;
STATICSELF.init();
PMC_get_sub(INTERP, SELF, sub);
/* we get relative offsets */
sub->start_offs = (size_t) VTABLE_shift_integer(INTERP, info);
sub->end_offs = (size_t) VTABLE_shift_integer(INTERP, info);
flags = VTABLE_shift_integer(INTERP, info);
PObj_get_FLAGS(SELF) |= flags & SUB_FLAG_PF_MASK;
sub->name = VTABLE_shift_string(INTERP, info);
sub->method_name = VTABLE_shift_string(INTERP, info);
sub->ns_entry_name = VTABLE_shift_string(INTERP, info);
/* lookup or create HLL */
sub->HLL_id = Parrot_hll_register_HLL(INTERP,
VTABLE_shift_string(INTERP, info));
sub->comp_flags = VTABLE_shift_integer(INTERP, info);
sub->vtable_index = VTABLE_shift_integer(INTERP, info);
for (i = 0; i < 4; ++i)
sub->n_regs_used[i] = VTABLE_shift_integer(INTERP, info);
sub->subid = VTABLE_shift_string(INTERP, info);
}
/*
=item C<PMC *inspect()>
Returns the full set of meta-data about the sub.
=cut
*/
VTABLE PMC *inspect()
{
/* Create a hash, then use inspect_str to get all of its data */
PMC * const metadata = Parrot_pmc_new(INTERP, enum_class_Hash);
STRING * const pos_required_str = CONST_STRING(INTERP, "pos_required");
STRING * const pos_optional_str = CONST_STRING(INTERP, "pos_optional");
STRING * const named_required_str = CONST_STRING(INTERP, "named_required");
STRING * const named_optional_str = CONST_STRING(INTERP, "named_optional");
STRING * const pos_slurpy_str = CONST_STRING(INTERP, "pos_slurpy");
STRING * const named_slurpy_str = CONST_STRING(INTERP, "named_slurpy");
VTABLE_set_pmc_keyed_str(INTERP, metadata, pos_required_str,
VTABLE_inspect_str(INTERP, SELF, pos_required_str));
VTABLE_set_pmc_keyed_str(INTERP, metadata, pos_optional_str,
VTABLE_inspect_str(INTERP, SELF, pos_optional_str));
VTABLE_set_pmc_keyed_str(INTERP, metadata, named_required_str,
VTABLE_inspect_str(INTERP, SELF, named_required_str));
VTABLE_set_pmc_keyed_str(INTERP, metadata, named_optional_str,
VTABLE_inspect_str(INTERP, SELF, named_optional_str));
VTABLE_set_pmc_keyed_str(INTERP, metadata, pos_slurpy_str,
VTABLE_inspect_str(INTERP, SELF, pos_slurpy_str));
VTABLE_set_pmc_keyed_str(INTERP, metadata, named_slurpy_str,
VTABLE_inspect_str(INTERP, SELF, named_slurpy_str));
return metadata;
}
/*
=item C<PMC *inspect_str(STRING *what)>
Returns the specified item of metadata about the sub. Allowable
values are:
=over 4
=item pos_required
The number of required positional arguments
=item pos_optional
The number of optional positional arguments
=item named_required
The number of required named arguments
=item named_optional
The number of optional named arguments
=item pos_slurpy
1 if it takes slurpy positional arguments, 0 if not
=item named_slurpy
1 if it takes slurpy named arguments, 0 if not
=back
=cut
*/
VTABLE PMC *inspect_str(STRING *what)
{
Parrot_Sub_attributes *sub;
PMC *retval;
INTVAL count_found = -1;
PMC_get_sub(INTERP, SELF, sub);
/* If the argument info hasn't been generated yet, generate it. */
if (!sub->arg_info) {
/* Get pointer into the bytecode where this sub starts. */
const opcode_t *pc = sub->seg->base.data + sub->start_offs;
op_lib_t *core_ops = PARROT_GET_CORE_OPLIB(INTERP);
/* Allocate structure to store argument information in. */
sub->arg_info = mem_gc_allocate_zeroed_typed(INTERP,
Parrot_sub_arginfo);
/* If the first instruction is a get_params... */
if (OPCODE_IS(INTERP, sub->seg, *pc, core_ops, PARROT_OP_get_params_pc)) {
/* Get the signature (the next thing in the bytecode). */
PMC * const sig = sub->seg->const_table->pmc.constants[*(++pc)];
/* Iterate over the signature and compute argument counts. */
const INTVAL sig_length = VTABLE_elements(INTERP, sig);
int i;
ASSERT_SIG_PMC(sig);
for (i = 0; i < sig_length; ++i) {
int sig_item = VTABLE_get_integer_keyed_int(INTERP, sig, i);
if (PARROT_ARG_SLURPY_ARRAY_ISSET(sig_item)){
if (PARROT_ARG_NAME_ISSET(sig_item))
sub->arg_info->named_slurpy = 1;
else
sub->arg_info->pos_slurpy = 1;
}
else if (PARROT_ARG_NAME_ISSET(sig_item)) {
++i;
sig_item = VTABLE_get_integer_keyed_int(INTERP, sig, i);
if (PARROT_ARG_OPTIONAL_ISSET(sig_item))
++sub->arg_info->named_optional;
else
++sub->arg_info->named_required;
}
else if (!PARROT_ARG_OPT_FLAG_ISSET(sig_item)) {
if (PARROT_ARG_OPTIONAL_ISSET(sig_item))
++sub->arg_info->pos_optional;
else
++sub->arg_info->pos_required;
}
}
}
}
/* Return the requested argument information */
if (STRING_equal(INTERP, what, CONST_STRING(INTERP, "pos_required"))) {
count_found = (INTVAL)sub->arg_info->pos_required;
}
else if (STRING_equal(INTERP, what, CONST_STRING(INTERP, "pos_optional"))) {
count_found = (INTVAL)sub->arg_info->pos_optional;
}
else if (STRING_equal(INTERP, what, CONST_STRING(INTERP, "pos_slurpy"))) {
count_found = (INTVAL)sub->arg_info->pos_slurpy;
}
else if (STRING_equal(INTERP, what, CONST_STRING(INTERP, "named_required"))) {
count_found = (INTVAL)sub->arg_info->named_required;
}
else if (STRING_equal(INTERP, what, CONST_STRING(INTERP, "named_optional"))) {
count_found = (INTVAL)sub->arg_info->named_optional;
}
else if (STRING_equal(INTERP, what, CONST_STRING(INTERP, "named_slurpy"))) {
count_found = (INTVAL)sub->arg_info->named_slurpy;
}
else
Parrot_ex_throw_from_c_args(INTERP, NULL,
EXCEPTION_INVALID_OPERATION,
"Unknown introspection value '%S'", what);
retval = Parrot_pmc_new_init_int(INTERP, enum_class_Integer, count_found);
return retval;
}
/*
=back
=head2 METHODS
=over 4
=item C<INTVAL start_offs()>
Returns the start offset of the Sub.
=item C<INTVAL end_offs()>
Returns the end offset of the Sub.
=item C<PMC *get_namespace()>
Returns the namespace PMC, where the Sub is defined.
TODO return C<namespace_stash> instead.
=item C<INTVAL __get_regs_used(char *kind)>
Returns the number of used registers for register kinds "I", "S", "P", "N".
=item C<PMC *get_lexinfo()>
Returns the LexInfo PMC, if any or a Null PMC.
=item C<PMC *get_multisig()>
Returns the MMD signature PMC, if any, or a Null PMC.
=item C<PMC *get_outer()>
Gets the sub that is the outer of this one, if any, or a Null PMC.
=item C<void set_outer(PMC *outer)>
Sets the sub that is the outer of this one.
=item C<void set_outer_ctx(PMC *outer_ctx)>
Set the outer context to be used on the next invocation of this sub.
=item C<INTVAL arity()>
Returns the arity of the Sub (the number of arguments, excluding optional and
slurpy arguments).
=cut
*/