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CV type constraints
[gitmo/Moose.git] / Moose.xs
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1ea12c91 1#include "EXTERN.h"
2#include "perl.h"
3#include "XSUB.h"
4
035fd0c4 5#define NEED_newRV_noinc
6#define NEED_newSVpvn_share
7#define NEED_sv_2pv_flags
8#include "ppport.h"
9
10#ifndef XSPROTO
11#define XSPROTO(name) void name(pTHX_ CV* cv)
12#endif
13
14#ifndef gv_stashpvs
15#define gv_stashpvs(x, y) gv_stashpvn(STR_WITH_LEN(x), y)
16#endif
17
1ea12c91 18/* FIXME
1ea12c91 19 * delegations and attribute helpers:
20 *
21 * typedef struct {
de2f2e97 22 * ATTR *attr;
1ea12c91 23 * pv *method;
24 * } delegation;
25 *
26 * typedef struct {
de2f2e97 27 * ATTR *attr;
1ea12c91 28 * I32 *type; // hash, array, whatever + vtable for operation
29 * } attributehelper;
30 */
31
de2f2e97 32
33STATIC MGVTBL null_mg_vtbl = {
34 NULL, /* get */
35 NULL, /* set */
36 NULL, /* len */
37 NULL, /* clear */
38 NULL, /* free */
39#if MGf_COPY
40 NULL, /* copy */
41#endif /* MGf_COPY */
42#if MGf_DUP
43 NULL, /* dup */
44#endif /* MGf_DUP */
45#if MGf_LOCAL
46 NULL, /* local */
47#endif /* MGf_LOCAL */
48};
49
f253044f 50STATIC MAGIC *stash_in_mg (pTHX_ SV *sv, SV *obj) {
51 MAGIC *mg = sv_magicext(sv, obj, PERL_MAGIC_ext, &null_mg_vtbl, NULL, 0 );
52 mg->mg_flags |= MGf_REFCOUNTED;
53
54 return mg;
55}
56
57STATIC SV *get_stashed_in_mg(pTHX_ SV *sv) {
58 MAGIC *mg, *moremagic;
59
60 if (SvTYPE(sv) >= SVt_PVMG) {
61 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
62 if ((mg->mg_type == PERL_MAGIC_ext) && (mg->mg_virtual == &null_mg_vtbl))
63 break;
64 }
65 if (mg)
66 return mg->mg_obj;
67 }
68
69 return NULL;
70}
de2f2e97 71
4c6fbfb1 72/* this is a enum of checks */
de2f2e97 73typedef enum {
4c6fbfb1 74 Any, /* or item, or bool */
75 Undef,
76 Defined,
77 Str, /* or value */
78 Num,
79 Int,
80 GlobRef, /* SVt_PVGV */
81 ArrayRef, /* SVt_PVAV */
82 HashRef, /* SVt_PVHV */
83 CodeRef, /* SVt_PVCV */
84 Ref,
85 ScalarRef,
86 FileHandle,
87 RegexpRef,
88 Object,
160f9ca7 89 ClassName,
4c6fbfb1 90 /* complex checks */
91 Role,
4c6fbfb1 92 Enum,
de2f2e97 93} TC;
94
de2f2e97 95typedef enum {
96 tc_none = 0,
97 tc_type,
160f9ca7 98 tc_stash,
de2f2e97 99 tc_cv,
de2f2e97 100 tc_op,
4c6fbfb1 101 tc_fptr,
de2f2e97 102} tc_kind;
103
104typedef union {
4c6fbfb1 105 TC type;
7ce1a351 106 SV *sv;
4c6fbfb1 107 OP *op;
4c6fbfb1 108 bool (*fptr)(pTHX_ SV *type_constraint, SV *sv);
109} TC_CHECK;
110
111typedef union {
de2f2e97 112 char *builder;
fe0194bf 113 SV *sv;
de2f2e97 114 OP *op;
115 U32 type;
116} DEFAULT;
117
118typedef enum {
119 default_none = 0,
fe0194bf 120 default_normal,
de2f2e97 121 default_builder,
fe0194bf 122 default_type,
de2f2e97 123 default_op,
124} default_kind;
125
1ea12c91 126typedef struct {
de2f2e97 127 /* the meta instance struct */
128 struct mi *mi;
129
130 U32 flags; /* slot type, TC behavior, coerce, weaken, (no default | default, builder + lazy), auto_deref */
131
132 /* slot access fields */
133 SV *slot_sv; /* value of the slot (slot name presumably) */
134 U32 slot_u32; /* for optimized access (precomputed hash or otherr) */
135
136 DEFAULT def; /* cv, value or other, depending on flags */
137
138 TC_CHECK tc_check; /* cv, value or other, dependidng on flags */
139 SV *type_constraint; /* meta attr */
140
141 CV *initializer;
142 CV *trigger;
143
f253044f 144 SV *meta_attr; /* the meta attr object */
de2f2e97 145 AV *cvs; /* CVs which use this attr */
146} ATTR;
147
148/* slot flags:
149 * instance reading writing
150 * 00000000 00000000 00000000 00000000
7ce1a351 151 * ^ trigger
152 * ^ weak
45922f54 153 * ^ tc.sv is refcounted
de2f2e97 154 * ^^^ tc_kind
155 * ^ coerce
156 * ^^^ default_kind
157 * ^ lazy
45922f54 158 * ^ def.sv is refcounted
de2f2e97 159 * ^ required
160 * ^^^^^^^ if 0 then nothing special (just hash)? FIXME TBD
161 */
162
163#define ATTR_INSTANCE_MASK 0xff000000
164#define ATTR_READING_MASK 0x0000ff00
165#define ATTR_WRITING_MASK 0x000000ff
166
167#define ATTR_MASK_TYPE 0x7
168
169#define ATTR_MASK_DEFAULT 0x700
fe0194bf 170#define ATTR_SHIFT_DEFAULT 8
de2f2e97 171
172#define ATTR_LAZY 0x800
fe0194bf 173#define ATTR_DEFREFCNT 0x1000
de2f2e97 174
7ce1a351 175#define ATTR_COERCE 0x8
176#define ATTR_TCREFCNT 0x10
177#define ATTR_WEAK 0x20
178#define ATTR_TRIGGER 0x40
de2f2e97 179
180#define ATTR_ISWEAK(attr) ( attr->flags & ATTR_WEAK )
181#define ATTR_ISLAZY(attr) ( attr->flags & ATTR_LAZY )
182#define ATTR_ISCOERCE(attr) ( attr->flags & ATTR_COERCE )
1ea12c91 183
de2f2e97 184#define ATTR_TYPE(f) ( attr->flags & 0x7 )
185#define ATTR_DEFAULT(f) ( ( attr->flags & ATTR_MASK_DEFAULT ) >> ATTR_SHIFT_DEFAULT )
1ea12c91 186
de2f2e97 187#define ATTR_DUMB_READER(attr) !ATTR_IS_LAZY(attr)
188#define ATTR_DUMB_WRITER(attr) ( ( attr->flags & ATTR_WRITING_MASK ) == 0 )
189#define ATTR_DUMB_INSTANCE(attr) ( ( attr->flags & ATTR_INSTANCE_MASK ) == 0 )
1ea12c91 190
f253044f 191#define dATTR ATTR *attr = (XSANY.any_i32 ? INT2PTR(ATTR *, (XSANY.any_i32)) : define_attr(aTHX_ cv))
de2f2e97 192
193
194/* FIXME define a vtable that does call_sv */
195typedef struct {
196 SV * (*get)(pTHX_ SV *self, ATTR *attr);
197 void (*set)(pTHX_ SV *self, ATTR *attr, SV *value);
198 bool * (*has)(pTHX_ SV *self, ATTR *attr);
199 SV * (*delete)(pTHX_ SV *self, ATTR *attr);
200} instance_vtbl;
201
202
203typedef enum {
204 hash = 0,
205
206 /* these are not yet implemented */
207 array,
208 fptr,
209 cv,
210 judy,
211} instance_types;
212
213typedef struct mi {
de2f2e97 214 HV *stash;
215
216 /* slot access method */
217 instance_types type;
218 instance_vtbl *vtbl;
219
220 /* attr descriptors */
221 I32 num_attrs;
222 ATTR *attrs;
223} MI;
224
225
4c6fbfb1 226
227
228STATIC bool check_is_scalar_ref(SV *sv) {
229 if( SvROK(sv) ) {
230 switch (SvTYPE(SvRV(sv))) {
231 case SVt_IV:
232 case SVt_NV:
233 case SVt_PV:
234 case SVt_NULL:
235 return 1;
236 break;
237 default:
238 return 0;
239 }
240 }
241 return 0;
242}
243
244STATIC bool check_reftype(TC type, SV *sv) {
245 int svt;
246
247 if ( !SvROK(sv) )
248 return 0;
249
250 switch (type) {
251 case GlobRef:
252 svt = SVt_PVGV;
253 break;
254 case ArrayRef:
255 svt = SVt_PVAV;
256 break;
257 case HashRef:
258 svt = SVt_PVHV;
259 break;
260 case CodeRef:
261 svt = SVt_PVCV;
262 break;
263 }
264
160f9ca7 265 return SvTYPE(SvRV(sv)) == svt;
4c6fbfb1 266}
267
7ce1a351 268STATIC bool check_sv_class(pTHX_ HV *stash, SV *sv) {
4c6fbfb1 269 dSP;
270 bool ret;
7ce1a351 271 SV *rv;
4c6fbfb1 272
273 if (!sv)
274 return 0;
275 SvGETMAGIC(sv);
276 if (!SvROK(sv))
277 return 0;
7ce1a351 278 rv = (SV*)SvRV(sv);
279 if (!SvOBJECT(rv))
4c6fbfb1 280 return 0;
7ce1a351 281 if (SvSTASH(rv) == stash)
4c6fbfb1 282 return 1;
283
284 ENTER;
285 SAVETMPS;
286 PUSHMARK(SP);
287 XPUSHs(sv);
7ce1a351 288 XPUSHs(sv_2mortal(newSVpv(HvNAME_get(stash), 0)));
4c6fbfb1 289 PUTBACK;
290
291 call_method("isa", G_SCALAR);
292
293 SPAGAIN;
294 ret = SvTRUE(TOPs);
295
296 FREETMPS;
297 LEAVE;
298
299 return ret;
300}
301
302STATIC bool check_sv_type (TC type, SV *sv) {
303 if (!sv)
304 return 0;
160f9ca7 305
4c6fbfb1 306 switch (type) {
307 case Any:
308 return 1;
309 break;
310 case Undef:
311 return !SvOK(sv);
312 break;
313 case Defined:
314 return SvOK(sv);
315 break;
316 case Str:
317 return (SvOK(sv) && !SvROK(sv));
160f9ca7 318 case Num:
319#if (PERL_VERSION < 8) || (PERL_VERSION == 8 && PERL_SUBVERSION <5)
320 if (!SvPOK(sv) && !SvPOKp(sv))
321 return SvFLAGS(sv) & (SVf_NOK|SVp_NOK|SVf_IOK|SVp_IOK);
322 else
323#endif
324 return looks_like_number(sv);
325 break;
326 case Int:
327 if ( SvIOK(sv) ) {
328 return 1;
329 } else if ( SvPOK(sv) ) {
0be3b17f 330 /* FIXME i really don't like this */
160f9ca7 331 int i;
332 STRLEN len;
333 char *pv = SvPV(sv, len);
334 char *end = pv + len;
0be3b17f 335 char *tail = end;
160f9ca7 336
337 errno = 0;
0be3b17f 338 i = strtol(pv, &tail, 0);
339
340 if ( errno ) return 0;
341
342 while ( tail != end ) {
343 if ( !isspace(*tail++) ) return 0;
344 }
345
346 return 1;
160f9ca7 347 }
348 return 0;
349 break;
4c6fbfb1 350 case Ref:
351 return SvROK(sv);
352 break;
353 case ScalarRef:
354 return check_is_scalar_ref(sv);
355 break;
356 case ArrayRef:
357 case HashRef:
358 case CodeRef:
359 case GlobRef:
360 return check_reftype(type, sv);
361 break;
362 case Object:
363 return sv_isobject(sv);
364 break;
160f9ca7 365 case ClassName:
7ce1a351 366 if ( SvOK(sv) && !SvROK(sv) ) {
160f9ca7 367 STRLEN len;
368 char *pv;
369 pv = SvPV(sv, len);
370 return ( gv_stashpvn(pv, len, 0) != NULL );
160f9ca7 371 }
7ce1a351 372 return 0;
373 break;
4c6fbfb1 374 case RegexpRef:
375 return sv_isa(sv, "Regexp");
376 break;
377 case FileHandle:
378 croak("todo");
379 break;
380 default:
381 croak("todo");
382 }
383
384 return 0;
385}
386
45922f54 387STATIC bool check_sv_cv (pTHX_ SV *cv, SV *sv) {
388 bool ret;
389 dSP;
390
391 ENTER;
392 SAVETMPS;
393 PUSHMARK(SP);
394 XPUSHs(sv);
395 PUTBACK;
396
397 call_sv(cv, G_SCALAR);
398
399 SPAGAIN;
400 ret = SvTRUE(POPs);
401
402 PUTBACK;
403 FREETMPS;
404 LEAVE;
405
406 return ret;
407}
408
160f9ca7 409STATIC bool check_type_constraint(pTHX_ tc_kind kind, TC_CHECK tc_check, SV *type_constraint, SV *sv) {
4c6fbfb1 410 switch (kind) {
411 case tc_none:
412 return 1;
413 break;
414 case tc_type:
415 return check_sv_type(tc_check.type, sv);
416 break;
417 case tc_stash:
7ce1a351 418 return check_sv_class(aTHX_ (HV *)tc_check.sv, sv);
4c6fbfb1 419 break;
4c6fbfb1 420 case tc_fptr:
421 return tc_check.fptr(aTHX_ type_constraint, sv);
422 break;
423 case tc_cv:
45922f54 424 return check_sv_cv(aTHX_ tc_check.sv, sv);
425 break;
4c6fbfb1 426 case tc_op:
427 croak("todo");
428 break;
429 }
430
431 croak("todo");
432 return 0;
433}
434
435
160f9ca7 436STATIC void init_attr (MI *mi, ATTR *attr, AV *desc) {
437 U32 flags = 0;
1ea12c91 438 U32 hash;
439 STRLEN len;
de2f2e97 440 char *pv;
160f9ca7 441 I32 ix = av_len(desc);
442 SV **params = AvARRAY(desc);
443 SV *tc;
444 SV *key;
de2f2e97 445
446 attr->mi = mi;
447
de2f2e97 448
160f9ca7 449 if ( ix != 12 )
450 croak("wrong number of args (%d != 13)", ix + 1);
de2f2e97 451
160f9ca7 452 for ( ; ix >= 0; ix-- ) {
453 if ( !params[ix] || params[ix] == &PL_sv_undef )
454 croak("bad params");
455 }
456
457 if ( !SvROK(params[1]) || SvTYPE(SvRV(params[1])) != SVt_PVAV )
458 croak("slots is not an array");
de2f2e97 459
160f9ca7 460 if ( av_len((AV *)SvRV(params[1])) != 0 )
461 croak("Only unary slots are supported at the moment");
1ea12c91 462
160f9ca7 463 /* calculate a hash from the slot */
464 /* FIXME arrays etc should also be supported */
465 key = *av_fetch((AV *)SvRV(params[1]), 0, 0);
466 pv = SvPV(key, len);
1ea12c91 467 PERL_HASH(hash, pv, len);
1ea12c91 468
de2f2e97 469
160f9ca7 470 /* FIXME better organize these */
471 if ( SvTRUE(params[2]) )
472 flags |= ATTR_WEAK;
473
474 if ( SvTRUE(params[3]) )
475 flags |= ATTR_COERCE;
de2f2e97 476
160f9ca7 477 if ( SvTRUE(params[4]) )
478 flags |= ATTR_LAZY;
de2f2e97 479
160f9ca7 480 tc = params[5];
de2f2e97 481
160f9ca7 482 if ( SvOK(tc) ) {
483 int tc_kind = SvIV(params[6]);
484 SV *data = params[7];
485
486 switch (tc_kind) {
160f9ca7 487 case tc_type:
488 attr->tc_check.type = SvIV(data);
489 break;
7ce1a351 490 case tc_stash:
491 flags |= ATTR_TCREFCNT;
492 attr->tc_check.sv = (SV *)gv_stashsv(data, 0);
493 break;
160f9ca7 494 case tc_cv:
7ce1a351 495 flags |= ATTR_TCREFCNT;
496 attr->tc_check.sv = SvRV(data);
497 if ( SvTYPE(attr->tc_check.sv) != SVt_PVCV )
160f9ca7 498 croak("compiled type constraint is not a coderef");
499 break;
500 default:
501 croak("todo");
502 }
503
504 flags |= tc_kind;
505 }
506
fe0194bf 507
508 if ( SvTRUE(params[10]) ) { /* has default */
509 SV *sv = params[11];
510
511 if ( SvROK(sv) ) {
512 attr->def.sv = SvRV(sv);
513 if ( SvTYPE(attr->def.sv) != SVt_PVCV )
514 croak("compiled type constraint is not a coderef");
515 } else {
516 attr->def.sv = newSVsv(sv);
517 sv_2mortal(attr->def.sv); /* in case of error soon, we refcnt inc it later after we're done checking params */
518 }
519
520 flags |= ( ATTR_DEFREFCNT | ( default_normal << ATTR_SHIFT_DEFAULT ) );
521 } else if ( SvOK(params[12]) ) { /* builder */
522 attr->def.sv = newSVsv(params[12]);
523 flags |= ( ATTR_DEFREFCNT | ( default_builder << ATTR_SHIFT_DEFAULT ) );
524 }
525
160f9ca7 526 attr->flags = flags; /* FIXME default_kind */
527
528 attr->trigger = SvROK(params[6]) ? (CV *)SvRV(params[6]) : NULL;
529 if ( attr->trigger && SvTYPE(attr->trigger) != SVt_PVCV )
530 croak("trigger is not a coderef");
531
532 attr->initializer = SvROK(params[7]) ? (CV *)SvRV(params[7]) : NULL;
533 if ( attr->initializer && SvTYPE(attr->initializer) != SVt_PVCV )
534 croak("initializer is not a coderef");
535
536 /* copy refs */
537 attr->meta_attr = newSVsv(params[0]);
538 attr->type_constraint = newSVsv(tc);
7ce1a351 539 SvREFCNT_inc(attr->trigger);
540 SvREFCNT_inc(attr->initializer);
541 if ( flags & ATTR_TCREFCNT ) SvREFCNT_inc(attr->tc_check.sv);
fe0194bf 542 if ( flags & ATTR_DEFREFCNT ) SvREFCNT_inc(attr->def.sv);
160f9ca7 543
544 attr->slot_sv = newSVpvn_share(pv, len, hash);
545 attr->slot_u32 = hash;
546
de2f2e97 547 /* cross refs to CVs which use this struct */
548 attr->cvs = newAV();
549}
550
f253044f 551STATIC MI *new_mi (pTHX_ HV *stash, AV *attrs) {
de2f2e97 552 MI *mi;
553 I32 ix;
554 const I32 num = av_len(attrs) + 1;
555
556 Newx(mi, 1, MI);
557
558 SvREFCNT_inc_simple(stash);
559 mi->stash = stash;
560
de2f2e97 561 mi->type = 0; /* nothing else implemented yet */
562
563 /* initialize attributes */
564 mi->num_attrs = num;
565 Newx(mi->attrs, num, ATTR);
f253044f 566 for ( ix = 0; ix < num; ix++ ) {
de2f2e97 567 SV **desc = av_fetch(attrs, ix, 0);
568
160f9ca7 569 if ( !desc || !*desc || !SvROK(*desc) || !(SvTYPE(SvRV(*desc)) == SVt_PVAV) ) {
de2f2e97 570 croak("Attribute descriptor has to be a hash reference");
f253044f 571 }
de2f2e97 572
160f9ca7 573 init_attr(mi, &mi->attrs[ix], (AV *)SvRV(*desc));
de2f2e97 574 }
575
576 return mi;
577}
578
7ce1a351 579STATIC void delete_mi (pTHX_ MI *mi) {
580 I32 i, j;
581
582 for ( i = 0; i < mi->num_attrs; i++ ) {
583 ATTR *attr = &mi->attrs[i];
584 /* clear the pointers to this meta attr from all the CVs */
585 SV **cvs = AvARRAY(attr->cvs);
586 for ( j = av_len(attr->cvs); j >= 0; j-- ) {
587 CV *cv = cvs[j];
588 XSANY.any_i32 = 0;
589 }
590
591 SvREFCNT_dec(attr->cvs);
592 SvREFCNT_dec(attr->slot_sv);
593 SvREFCNT_dec(attr->type_constraint);
594 if ( attr->flags & ATTR_TCREFCNT ) SvREFCNT_dec(attr->tc_check.sv);
595 SvREFCNT_dec(attr->initializer);
596 SvREFCNT_dec(attr->trigger);
597 SvREFCNT_dec(attr->meta_attr);
598 }
599
600 Safefree(mi->attrs);
601 Safefree(mi);
602}
603
f253044f 604STATIC SV *new_mi_obj (pTHX_ MI *mi) {
035fd0c4 605 HV *stash = gv_stashpvs("Moose::XS::Meta::Instance",0);
606 SV *obj = newRV_noinc(newSViv(PTR2IV(mi)));
607 sv_bless( obj, stash );
608 return obj;
f253044f 609}
de2f2e97 610
f253044f 611STATIC SV *attr_to_meta_instance(pTHX_ SV *meta_attr) {
612 dSP;
613 I32 count;
614 SV *mi;
615
616 if ( !meta_attr )
617 croak("No attr found in magic!");
618
619 ENTER;
620 SAVETMPS;
621 PUSHMARK(SP);
622 XPUSHs(meta_attr);
623 PUTBACK;
624 count = call_pv("Moose::XS::attr_to_meta_instance", G_SCALAR);
625
626 if ( count != 1 )
627 croak("attr_to_meta_instance borked (%d args returned, expecting 1)", count);
628
629 SPAGAIN;
630 mi = POPs;
631
632 SvREFCNT_inc(mi);
633
634 PUTBACK;
635 FREETMPS;
636 LEAVE;
637
fe0194bf 638 return sv_2mortal(mi);
f253044f 639}
640
641STATIC SV *perl_mi_to_c_mi(pTHX_ SV *perl_mi) {
642 dSP;
643 I32 count;
644 MI *mi = NULL;
645 SV *class;
646 SV *attrs;
647 HV *stash;
648
649 ENTER;
650 SAVETMPS;
651 PUSHMARK(SP);
652 XPUSHs(perl_mi);
653 PUTBACK;
654 count = call_pv("Moose::XS::meta_instance_to_attr_descs", G_ARRAY);
655
656 if ( count != 2 )
657 croak("meta_instance_to_attr_descs borked (%d args returned, expecting 2)", count);
658
659 SPAGAIN;
660 attrs = POPs;
661 class = POPs;
662
663 PUTBACK;
664
665 stash = gv_stashsv(class, 0);
666
667 mi = new_mi(aTHX_ stash, (AV *)SvRV(attrs));
668
669 FREETMPS;
670 LEAVE;
671
672 return new_mi_obj(aTHX_ mi);
673}
674
675STATIC ATTR *mi_find_attr(MI *mi, SV *meta_attr) {
676 I32 ix;
677
035fd0c4 678 for ( ix = 0; ix < mi->num_attrs; ix++ ) {
f253044f 679 if ( SvRV(mi->attrs[ix].meta_attr) == SvRV(meta_attr) ) {
680 return &mi->attrs[ix];
de2f2e97 681 }
de2f2e97 682 }
683
f253044f 684 sv_dump(meta_attr);
685 croak("Attr not found");
de2f2e97 686 return NULL;
687}
688
689STATIC ATTR *get_attr(pTHX_ CV *cv) {
f253044f 690 SV *meta_attr = get_stashed_in_mg(aTHX_ (SV *)cv);
691 SV *perl_mi = attr_to_meta_instance(aTHX_ meta_attr);
692 SV *c_mi = get_stashed_in_mg(aTHX_ SvRV(perl_mi));
693 MI *mi;
de2f2e97 694
f253044f 695 if (!c_mi) {
696 c_mi = perl_mi_to_c_mi(aTHX_ perl_mi);
e10d45dc 697 stash_in_mg(aTHX_ SvRV(perl_mi), c_mi);
7ce1a351 698 SvREFCNT_dec(c_mi);
f253044f 699 }
700
f253044f 701 mi = INT2PTR(MI *, SvIV(SvRV(c_mi)));
702
703 return mi_find_attr(mi, meta_attr);
1ea12c91 704}
705
de2f2e97 706STATIC ATTR *define_attr (pTHX_ CV *cv) {
707 ATTR *attr = get_attr(aTHX_ cv);
708 assert(attr);
709
710 XSANY.any_i32 = PTR2IV(attr);
f253044f 711
7ce1a351 712 SvREFCNT_inc(cv);
f253044f 713 av_push( attr->cvs, (SV *)cv );
de2f2e97 714
715 return attr;
716}
717
718STATIC void weaken(pTHX_ SV *sv) {
1ea12c91 719#ifdef SvWEAKREF
de2f2e97 720 sv_rvweaken(sv); /* FIXME i think this might warn when weakening an already weak ref */
1ea12c91 721#else
722 croak("weak references are not implemented in this release of perl");
723#endif
724}
725
726
727/* meta instance protocol */
728
de2f2e97 729STATIC SV *get_slot_value(pTHX_ SV *self, ATTR *attr) {
1ea12c91 730 HE *he;
731
732 assert(self);
733 assert(SvROK(self));
734 assert(SvTYPE(SvRV(self)) == SVt_PVHV);
735
de2f2e97 736 assert( ATTR_DUMB_INSTANCE(attr) );
737
738 if ((he = hv_fetch_ent((HV *)SvRV(self), attr->slot_sv, 0, attr->slot_u32)))
1ea12c91 739 return HeVAL(he);
740 else
741 return NULL;
742}
743
de2f2e97 744STATIC void set_slot_value(pTHX_ SV *self, ATTR *attr, SV *value) {
1ea12c91 745 HE *he;
4c6fbfb1 746 SV *copy;
1ea12c91 747
748 assert(self);
749 assert(SvROK(self));
750 assert(SvTYPE(SvRV(self)) == SVt_PVHV);
751
de2f2e97 752 assert( ATTR_DUMB_INSTANCE(attr) );
753
4c6fbfb1 754 copy = newSVsv(value);
755
756 he = hv_store_ent((HV*)SvRV(self), attr->slot_sv, copy, attr->slot_u32);
1ea12c91 757
1ea12c91 758 if (he != NULL) {
de2f2e97 759 if ( ATTR_ISWEAK(attr) )
4c6fbfb1 760 weaken(aTHX_ HeVAL(he));
1ea12c91 761 } else {
4c6fbfb1 762 SvREFCNT_dec(copy);
1ea12c91 763 croak("Hash store failed.");
764 }
765}
766
de2f2e97 767STATIC bool has_slot_value(pTHX_ SV *self, ATTR *attr) {
1ea12c91 768 assert(self);
769 assert(SvROK(self));
770 assert(SvTYPE(SvRV(self)) == SVt_PVHV);
771
de2f2e97 772 assert( ATTR_DUMB_INSTANCE(attr) );
773
774 return hv_exists_ent((HV *)SvRV(self), attr->slot_sv, attr->slot_u32);
775}
776
777STATIC SV *deinitialize_slot(pTHX_ SV *self, ATTR *attr) {
778 assert(self);
779 assert(SvROK(self));
780 assert(SvTYPE(SvRV(self)) == SVt_PVHV);
781
782 assert( ATTR_DUMB_INSTANCE(attr) );
783
784 return hv_delete_ent((HV *)SvRV(self), attr->slot_sv, 0, attr->slot_u32);
1ea12c91 785}
786
fe0194bf 787STATIC void setter_common(pTHX_ SV *self, ATTR *attr, SV *value);
788
789
790STATIC SV *get_default(pTHX_ SV *self, ATTR *attr) {
791 switch ( ATTR_DEFAULT(attr) ) {
792 case default_none:
793 return NULL;
794 break;
795 case default_builder:
796 {
797 SV *sv;
798 dSP;
799
800 ENTER;
801 SAVETMPS;
802 PUSHMARK(SP);
803 XPUSHs(self);
804 PUTBACK;
805
806 call_method(SvPV_nolen(attr->def.sv), G_SCALAR);
807
808 SPAGAIN;
809 sv = POPs;
810
811 SvREFCNT_inc(sv);
812
813 PUTBACK;
814 FREETMPS;
815 LEAVE;
816
817 return sv_2mortal(sv);
818 }
819 break;
820 case default_normal:
821 if ( SvROK(attr->def.sv) ) {
822 printf("CV default\n");
823 } else {
824 printf("simple value\n");
825 return attr->def.sv; /* will be copied by set for lazy, and by reader for both cases */
826 }
827 break;
828 case default_op:
829 case default_type:
830 croak("todo");
831 break;
832 }
833
834 return NULL;
835}
836
160f9ca7 837STATIC SV *getter_common(pTHX_ SV *self, ATTR *attr) {
fe0194bf 838 SV *value = get_slot_value(aTHX_ self, attr);
839
840 if ( value ) {
841 return value;
842 } else if ( ATTR_ISLAZY(attr) ) {
843 value = get_default(aTHX_ self, attr);
844 setter_common(aTHX_ self, attr, value);
845 return value;
846 }
847
848 return NULL;
160f9ca7 849}
850
851STATIC void setter_common(pTHX_ SV *self, ATTR *attr, SV *value) {
fe0194bf 852 if ( ATTR_TYPE(attr) ) {
853 if ( !check_type_constraint(aTHX_ ATTR_TYPE(attr), attr->tc_check, attr->type_constraint, value) )
160f9ca7 854 croak("Bad param");
855 }
856
857 set_slot_value(aTHX_ self, attr, value);
858}
1ea12c91 859
860/* simple high level api */
861
de2f2e97 862STATIC XS(getter);
863STATIC XS(getter)
1ea12c91 864{
865#ifdef dVAR
866 dVAR;
867#endif
868 dXSARGS;
de2f2e97 869 dATTR;
1ea12c91 870 SV *value;
871
872 if (items != 1)
873 Perl_croak(aTHX_ "Usage: %s(%s)", GvNAME(CvGV(cv)), "self");
874
875 SP -= items;
876
160f9ca7 877 value = getter_common(aTHX_ ST(0), attr);
1ea12c91 878
879 if (value) {
880 ST(0) = sv_mortalcopy(value); /* mortalcopy because $_ .= "blah" for $foo->bar */
881 XSRETURN(1);
882 } else {
883 XSRETURN_UNDEF;
884 }
885}
886
de2f2e97 887STATIC XS(setter);
888STATIC XS(setter)
1ea12c91 889{
890#ifdef dVAR
891 dVAR;
892#endif
893 dXSARGS;
de2f2e97 894 dATTR;
1ea12c91 895
896 if (items != 2)
897 Perl_croak(aTHX_ "Usage: %s(%s, %s)", GvNAME(CvGV(cv)), "self", "value");
898
899 SP -= items;
900
160f9ca7 901 setter_common(aTHX_ ST(0), attr, ST(1));
1ea12c91 902
903 ST(0) = ST(1); /* return value */
904 XSRETURN(1);
905}
906
de2f2e97 907STATIC XS(accessor);
908STATIC XS(accessor)
1ea12c91 909{
910#ifdef dVAR
911 dVAR;
912#endif
913 dXSARGS;
de2f2e97 914 dATTR;
1ea12c91 915
916 if (items < 1)
917 Perl_croak(aTHX_ "Usage: %s(%s, [ %s ])", GvNAME(CvGV(cv)), "self", "value");
918
919 SP -= items;
920
921 if (items > 1) {
160f9ca7 922 setter_common(aTHX_ ST(0), attr, ST(1));
1ea12c91 923 ST(0) = ST(1); /* return value */
924 } else {
160f9ca7 925 SV *value = getter_common(aTHX_ ST(0), attr);
1ea12c91 926 if ( value ) {
927 ST(0) = value;
928 } else {
929 XSRETURN_UNDEF;
930 }
931 }
932
933 XSRETURN(1);
934}
935
936STATIC XS(predicate);
937STATIC XS(predicate)
938{
939#ifdef dVAR
940 dVAR;
941#endif
942 dXSARGS;
de2f2e97 943 dATTR;
1ea12c91 944
945 if (items != 1)
946 Perl_croak(aTHX_ "Usage: %s(%s)", GvNAME(CvGV(cv)), "self");
947
948 SP -= items;
949
de2f2e97 950 if ( has_slot_value(aTHX_ ST(0), attr) )
1ea12c91 951 XSRETURN_YES;
952 else
953 XSRETURN_NO;
954}
955
956enum xs_body {
de2f2e97 957 xs_body_getter = 0,
958 xs_body_setter,
959 xs_body_accessor,
1ea12c91 960 xs_body_predicate,
961 max_xs_body
962};
963
964STATIC XSPROTO ((*xs_bodies[])) = {
de2f2e97 965 getter,
966 setter,
967 accessor,
1ea12c91 968 predicate,
969};
970
971MODULE = Moose PACKAGE = Moose::XS
972
973CV *
de2f2e97 974new_sub(attr, name)
1ea12c91 975 INPUT:
de2f2e97 976 SV *attr;
977 SV *name;
1ea12c91 978 ALIAS:
de2f2e97 979 new_getter = xs_body_getter
980 new_setter = xs_body_setter
981 new_accessor = xs_body_accessor
982 new_predicate = xs_body_predicate
1ea12c91 983 PREINIT:
984 CV * cv;
985 CODE:
986 if ( ix >= max_xs_body )
987 croak("Unknown Moose::XS body type");
988
de2f2e97 989 if ( !sv_isobject(attr) )
990 croak("'attr' must be a Moose::Meta::Attribute");
991
992 cv = newXS(SvOK(name) ? SvPV_nolen(name) : NULL, xs_bodies[ix], __FILE__);
1ea12c91 993
994 if (cv == NULL)
995 croak("Oi vey!");
996
de2f2e97 997 /* associate CV with meta attr */
f253044f 998 stash_in_mg(aTHX_ (SV *)cv, attr);
de2f2e97 999
1000 /* this will be set on first call */
1001 XSANY.any_i32 = 0;
1ea12c91 1002
1003 RETVAL = cv;
1004 OUTPUT:
1005 RETVAL
1006
1007
f253044f 1008MODULE = Moose PACKAGE = Moose::XS::Meta::Instance
1009
1010void
1011DESTROY(self)
1012 INPUT:
1013 SV *self;
1014 PREINIT:
1015 MI *mi = INT2PTR(MI *, SvIV(SvRV(self)));
1016 CODE:
7ce1a351 1017 delete_mi(aTHX_ mi);
A Postmodern Object System for Perl5 - now lives at https://github.com/moose/Moose