-
-
Notifications
You must be signed in to change notification settings - Fork 594
/
func.c
5376 lines (4738 loc) · 163 KB
/
func.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
// Compiler implementation of the D programming language
// Copyright (c) 1999-2014 by Digital Mars
// All Rights Reserved
// written by Walter Bright
// http://www.digitalmars.com
// License for redistribution is by either the Artistic License
// in artistic.txt, or the GNU General Public License in gnu.txt.
// See the included readme.txt for details.
#include <stdio.h>
#include <assert.h>
#include "mars.h"
#include "init.h"
#include "declaration.h"
#include "attrib.h"
#include "expression.h"
#include "scope.h"
#include "mtype.h"
#include "aggregate.h"
#include "identifier.h"
#include "id.h"
#include "module.h"
#include "statement.h"
#include "template.h"
#include "hdrgen.h"
#include "target.h"
#include "parse.h"
#include "rmem.h"
#include "visitor.h"
void functionToBufferWithIdent(TypeFunction *t, OutBuffer *buf, const char *ident);
void genCmain(Scope *sc);
void toBufferShort(Type *t, OutBuffer *buf, HdrGenState *hgs);
void checkGC(FuncDeclaration *func, Statement *stmt);
/* A visitor to walk entire statements and provides ability to replace any sub-statements.
*/
class StatementRewriteWalker : public Visitor
{
/* Point the currently visited statement.
* By using replaceCurrent() method, you can replace AST during walking.
*/
Statement **ps;
void visitStmt(Statement *&s) { ps = &s; s->accept(this); }
public:
void replaceCurrent(Statement *s) { *ps = s; }
void visit(ErrorStatement *s) { }
void visit(PeelStatement *s)
{
if (s->s)
visitStmt(s->s);
}
void visit(ExpStatement *s) { }
void visit(DtorExpStatement *s) { }
void visit(CompileStatement *s) { }
void visit(CompoundStatement *s)
{
if (s->statements && s->statements->dim)
{
for (size_t i = 0; i < s->statements->dim; i++)
{
if ((*s->statements)[i])
visitStmt((*s->statements)[i]);
}
}
}
void visit(CompoundDeclarationStatement *s) { visit((CompoundStatement *)s); }
void visit(UnrolledLoopStatement *s)
{
if (s->statements && s->statements->dim)
{
for (size_t i = 0; i < s->statements->dim; i++)
{
if ((*s->statements)[i])
visitStmt((*s->statements)[i]);
}
}
}
void visit(ScopeStatement *s)
{
if (s->statement)
visitStmt(s->statement);
}
void visit(WhileStatement *s)
{
if (s->body)
visitStmt(s->body);
}
void visit(DoStatement *s)
{
if (s->body)
visitStmt(s->body);
}
void visit(ForStatement *s)
{
if (s->init)
visitStmt(s->init);
if (s->body)
visitStmt(s->body);
}
void visit(ForeachStatement *s)
{
if (s->body)
visitStmt(s->body);
}
void visit(ForeachRangeStatement *s)
{
if (s->body)
visitStmt(s->body);
}
void visit(IfStatement *s)
{
if (s->ifbody)
visitStmt(s->ifbody);
if (s->elsebody)
visitStmt(s->elsebody);
}
void visit(ConditionalStatement *s) { }
void visit(PragmaStatement *s) { }
void visit(StaticAssertStatement *s) { }
void visit(SwitchStatement *s)
{
if (s->body)
visitStmt(s->body);
}
void visit(CaseStatement *s)
{
if (s->statement)
visitStmt(s->statement);
}
void visit(CaseRangeStatement *s)
{
if (s->statement)
visitStmt(s->statement);
}
void visit(DefaultStatement *s)
{
if (s->statement)
visitStmt(s->statement);
}
void visit(GotoDefaultStatement *s) { }
void visit(GotoCaseStatement *s) { }
void visit(SwitchErrorStatement *s) { }
void visit(ReturnStatement *s) { }
void visit(BreakStatement *s) { }
void visit(ContinueStatement *s) { }
void visit(SynchronizedStatement *s)
{
if (s->body)
visitStmt(s->body);
}
void visit(WithStatement *s)
{
if (s->body)
visitStmt(s->body);
}
void visit(TryCatchStatement *s)
{
if (s->body)
visitStmt(s->body);
if (s->catches && s->catches->dim)
{
for (size_t i = 0; i < s->catches->dim; i++)
{
Catch *c = (*s->catches)[i];
if (c && c->handler)
visitStmt(c->handler);
}
}
}
void visit(TryFinallyStatement *s)
{
if (s->body)
visitStmt(s->body);
if (s->finalbody)
visitStmt(s->finalbody);
}
void visit(OnScopeStatement *s) { }
void visit(ThrowStatement *s) { }
void visit(DebugStatement *s)
{
if (s->statement)
visitStmt(s->statement);
}
void visit(GotoStatement *s) { }
void visit(LabelStatement *s)
{
if (s->statement)
visitStmt(s->statement);
}
void visit(AsmStatement *s) { }
void visit(ImportStatement *s) { }
};
/* Tweak all return statements and dtor call for nrvo_var, for correct NRVO.
*/
class NrvoWalker : public StatementRewriteWalker
{
public:
FuncDeclaration *fd;
Scope *sc;
void visit(ReturnStatement *s)
{
Expression *exp = s->exp;
if (exp)
{
TypeFunction *tf = (TypeFunction *)fd->type;
/* Bugzilla 10789:
* If NRVO is not possible, all returned lvalues should call their postblits.
*/
if (!fd->nrvo_can && !tf->isref && exp->isLvalue())
exp = callCpCtor(sc, exp);
/* Bugzilla 8665:
* If auto function has multiple return statements, returned values
* should be fixed to the determined return type.
*/
if (!fd->tintro && !tf->next->immutableOf()->equals(exp->type->immutableOf()))
{
exp = exp->castTo(sc, tf->next);
exp = exp->optimize(WANTvalue);
}
s->exp = exp;
}
}
void visit(TryFinallyStatement *s)
{
DtorExpStatement *des;
if (fd->nrvo_can &&
s->finalbody && (des = s->finalbody->isDtorExpStatement()) != NULL &&
fd->nrvo_var == des->var)
{
/* Normally local variable dtors are called regardless exceptions.
* But for nrvo_var, its dtor should be called only when exception is thrown.
*
* Rewrite:
* try { s->body; } finally { nrvo_var->edtor; }
* // equivalent with:
* // s->body; scope(exit) nrvo_var->edtor;
* as:
* try { s->body; } catch(__o) { nrvo_var->edtor; throw __o; }
* // equivalent with:
* // s->body; scope(failure) nrvo_var->edtor;
*/
Identifier *id = Lexer::uniqueId("__o");
Statement *sexception = new DtorExpStatement(Loc(), fd->nrvo_var->edtor, fd->nrvo_var);
Statement *handler = sexception;
if (sexception->blockExit(fd, false) & BEfallthru)
{
ThrowStatement *ts = new ThrowStatement(Loc(), new IdentifierExp(Loc(), id));
ts->internalThrow = true;
handler = new CompoundStatement(Loc(), sexception, ts);
}
Catches *catches = new Catches();
Catch *ctch = new Catch(Loc(), NULL, id, handler);
ctch->internalCatch = true;
ctch->semantic(sc); // Run semantic to resolve identifier '__o'
catches->push(ctch);
Statement *s2 = new TryCatchStatement(Loc(), s->body, catches);
replaceCurrent(s2);
s2->accept(this);
}
else
StatementRewriteWalker::visit(s);
}
};
/********************************* FuncDeclaration ****************************/
FuncDeclaration::FuncDeclaration(Loc loc, Loc endloc, Identifier *id, StorageClass storage_class, Type *type)
: Declaration(id)
{
//printf("FuncDeclaration(id = '%s', type = %p)\n", id->toChars(), type);
//printf("storage_class = x%x\n", storage_class);
this->storage_class = storage_class;
this->type = type;
if (type)
{
// Normalize storage_class, because function-type related attributes
// are already set in the 'type' in parsing phase.
this->storage_class &= ~(STC_TYPECTOR | STC_FUNCATTR);
}
this->loc = loc;
this->endloc = endloc;
fthrows = NULL;
frequire = NULL;
fdrequire = NULL;
fdensure = NULL;
outId = NULL;
vresult = NULL;
returnLabel = NULL;
scout = NULL;
fensure = NULL;
fbody = NULL;
localsymtab = NULL;
vthis = NULL;
v_arguments = NULL;
#ifdef IN_GCC
v_argptr = NULL;
v_arguments_var = NULL;
#endif
v_argsave = NULL;
parameters = NULL;
labtab = NULL;
overnext = NULL;
overnext0 = NULL;
vtblIndex = -1;
hasReturnExp = 0;
naked = 0;
inlineStatusExp = ILSuninitialized;
inlineStatusStmt = ILSuninitialized;
inlineNest = 0;
ctfeCode = NULL;
isArrayOp = 0;
semantic3Errors = false;
fes = NULL;
introducing = 0;
tintro = NULL;
/* The type given for "infer the return type" is a TypeFunction with
* NULL for the return type.
*/
inferRetType = (type && type->nextOf() == NULL);
storage_class2 = 0;
hasReturnExp = 0;
nrvo_can = 1;
nrvo_var = NULL;
shidden = NULL;
builtin = BUILTINunknown;
tookAddressOf = 0;
requiresClosure = false;
flags = 0;
gotos = NULL;
}
Dsymbol *FuncDeclaration::syntaxCopy(Dsymbol *s)
{
FuncDeclaration *f;
//printf("FuncDeclaration::syntaxCopy('%s')\n", toChars());
if (s)
f = (FuncDeclaration *)s;
else
f = new FuncDeclaration(loc, endloc, ident, storage_class, type->syntaxCopy());
f->outId = outId;
f->frequire = frequire ? frequire->syntaxCopy() : NULL;
f->fensure = fensure ? fensure->syntaxCopy() : NULL;
f->fbody = fbody ? fbody->syntaxCopy() : NULL;
assert(!fthrows); // deprecated
return f;
}
// Do the semantic analysis on the external interface to the function.
void FuncDeclaration::semantic(Scope *sc)
{
TypeFunction *f;
AggregateDeclaration *ad;
ClassDeclaration *cd;
InterfaceDeclaration *id;
#if 0
printf("FuncDeclaration::semantic(sc = %p, this = %p, '%s', linkage = %d)\n", sc, this, toPrettyChars(), sc->linkage);
if (isFuncLiteralDeclaration())
printf("\tFuncLiteralDeclaration()\n");
printf("sc->parent = %s, parent = %s\n", sc->parent->toChars(), parent ? parent->toChars() : "");
printf("type: %p, %s\n", type, type->toChars());
#endif
if (semanticRun != PASSinit && isFuncLiteralDeclaration())
{
/* Member functions that have return types that are
* forward references can have semantic() run more than
* once on them.
* See test\interface2.d, test20
*/
return;
}
if (semanticRun >= PASSsemanticdone)
return;
assert(semanticRun <= PASSsemantic);
semanticRun = PASSsemantic;
parent = sc->parent;
Dsymbol *parent = toParent();
if (scope)
{
sc = scope;
scope = NULL;
}
unsigned dprogress_save = Module::dprogress;
foverrides.setDim(0); // reset in case semantic() is being retried for this function
storage_class |= sc->stc & ~STCref;
ad = isThis();
if (ad)
{
storage_class |= ad->storage_class & (STC_TYPECTOR | STCsynchronized);
if (StructDeclaration *sd = ad->isStructDeclaration())
sd->makeNested();
}
if (sc->func)
storage_class |= sc->func->storage_class & STCdisable;
// Remove prefix storage classes silently.
if ((storage_class & STC_TYPECTOR) && !(ad || isNested()))
storage_class &= ~STC_TYPECTOR;
//printf("function storage_class = x%llx, sc->stc = x%llx, %x\n", storage_class, sc->stc, Declaration::isFinal());
FuncLiteralDeclaration *fld = isFuncLiteralDeclaration();
if (fld && fld->treq)
{
Type *treq = fld->treq;
assert(treq->nextOf()->ty == Tfunction);
if (treq->ty == Tdelegate)
fld->tok = TOKdelegate;
else if (treq->ty == Tpointer && treq->nextOf()->ty == Tfunction)
fld->tok = TOKfunction;
else
assert(0);
linkage = ((TypeFunction *)treq->nextOf())->linkage;
}
else
linkage = sc->linkage;
protection = sc->protection;
userAttribDecl = sc->userAttribDecl;
if (!originalType)
originalType = type->syntaxCopy();
if (!type->deco)
{
sc = sc->push();
sc->stc |= storage_class & STCdisable; // forward to function type
TypeFunction *tf = (TypeFunction *)type;
#if 1
/* If the parent is @safe, then this function defaults to safe
* too.
* If the parent's @safe-ty is inferred, then this function's @safe-ty needs
* to be inferred first.
*/
if (tf->trust == TRUSTdefault &&
!isInstantiated())
{
for (Dsymbol *p = sc->func; p; p = p->toParent2())
{
FuncDeclaration *fd = p->isFuncDeclaration();
if (fd)
{
if (fd->isSafeBypassingInference())
tf->trust = TRUSTsafe; // default to @safe
break;
}
}
}
#endif
if (tf->isref) sc->stc |= STCref;
if (tf->isnothrow) sc->stc |= STCnothrow;
if (tf->isnogc) sc->stc |= STCnogc;
if (tf->isproperty) sc->stc |= STCproperty;
if (tf->purity == PUREfwdref) sc->stc |= STCpure;
if (tf->trust == TRUSTsafe) sc->stc |= STCsafe;
if (tf->trust == TRUSTsystem) sc->stc |= STCsystem;
if (tf->trust == TRUSTtrusted) sc->stc |= STCtrusted;
if (isCtorDeclaration())
{
sc->flags |= SCOPEctor;
Type *tret;
if (!ad || parent->isUnionDeclaration())
{
error("constructors are only for class or struct definitions");
tret = Type::tvoid;
}
else
{
tret = ad->handleType();
assert(tret);
tret = tret->addStorageClass(storage_class | sc->stc);
tret = tret->addMod(type->mod);
}
tf->next = tret;
if (ad && ad->isStructDeclaration())
sc->stc |= STCref;
}
sc->linkage = linkage;
if (!tf->isNaked() && !(isThis() || isNested()))
{
OutBuffer buf;
MODtoBuffer(&buf, tf->mod);
error("without 'this' cannot be %s", buf.peekString());
tf->mod = 0; // remove qualifiers
}
/* Apply const, immutable, wild and shared storage class
* to the function type. Do this before type semantic.
*/
StorageClass stc = storage_class;
if (type->isImmutable())
stc |= STCimmutable;
if (type->isConst())
stc |= STCconst;
if (type->isShared() || storage_class & STCsynchronized)
stc |= STCshared;
if (type->isWild())
stc |= STCwild;
switch (stc & STC_TYPECTOR)
{
case STCimmutable:
case STCimmutable | STCconst:
case STCimmutable | STCwild:
case STCimmutable | STCwild | STCconst:
case STCimmutable | STCshared:
case STCimmutable | STCshared | STCconst:
case STCimmutable | STCshared | STCwild:
case STCimmutable | STCshared | STCwild | STCconst:
// Don't use immutableOf(), as that will do a merge()
type = type->makeImmutable();
break;
case STCconst:
type = type->makeConst();
break;
case STCwild:
type = type->makeWild();
break;
case STCwild | STCconst:
type = type->makeWildConst();
break;
case STCshared:
type = type->makeShared();
break;
case STCshared | STCconst:
type = type->makeSharedConst();
break;
case STCshared | STCwild:
type = type->makeSharedWild();
break;
case STCshared | STCwild | STCconst:
type = type->makeSharedWildConst();
break;
case 0:
break;
default:
assert(0);
}
type = type->semantic(loc, sc);
sc = sc->pop();
}
if (type->ty != Tfunction)
{
if (type->ty != Terror)
{
error("%s must be a function instead of %s", toChars(), type->toChars());
type = Type::terror;
}
errors = true;
return;
}
else
{
// Merge back function attributes into 'originalType'.
// It's used for mangling, ddoc, and json output.
TypeFunction *tfo = (TypeFunction *)originalType;
TypeFunction *tfx = (TypeFunction *)type;
tfo->mod = tfx->mod;
tfo->isref = tfx->isref;
tfo->isnothrow = tfx->isnothrow;
tfo->isnogc = tfx->isnogc;
tfo->isproperty = tfx->isproperty;
tfo->purity = tfx->purity;
tfo->trust = tfx->trust;
storage_class &= ~(STC_TYPECTOR | STC_FUNCATTR);
}
f = (TypeFunction *)type;
size_t nparams = Parameter::dim(f->parameters);
if (storage_class & STCscope)
error("functions cannot be scope");
if (storage_class & STCvirtual)
{
if (ad && ad->isStructDeclaration())
error("struct member functions cannot be virtual");
else if (isStatic())
error("static member functions cannot be virtual");
}
if (isAbstract() && !isVirtual())
{
const char *sfunc;
if (isStatic())
sfunc = "static";
else if (protection == PROTprivate || protection == PROTpackage)
sfunc = Pprotectionnames[protection];
else
sfunc = "non-virtual";
error("%s functions cannot be abstract", sfunc);
}
if (isOverride() && !isVirtual())
{
if ((prot() == PROTprivate || prot() == PROTpackage) && isMember())
error("%s method is not virtual and cannot override", Pprotectionnames[prot()]);
else
error("cannot override a non-virtual function");
}
if (isAbstract() && isFinalFunc())
error("cannot be both final and abstract");
#if 0
if (isAbstract() && fbody)
error("abstract functions cannot have bodies");
#endif
#if 0
if (isStaticConstructor() || isStaticDestructor())
{
if (!isStatic() || type->nextOf()->ty != Tvoid)
error("static constructors / destructors must be static void");
if (f->arguments && f->arguments->dim)
error("static constructors / destructors must have empty parameter list");
// BUG: check for invalid storage classes
}
#endif
StructDeclaration *sd = parent->isStructDeclaration();
if (sd)
{
if (isCtorDeclaration())
{
goto Ldone;
}
}
id = parent->isInterfaceDeclaration();
if (id)
{
storage_class |= STCabstract;
if (isCtorDeclaration() ||
isPostBlitDeclaration() ||
isDtorDeclaration() ||
isInvariantDeclaration() ||
isNewDeclaration() || isDelete())
error("constructors, destructors, postblits, invariants, new and delete functions are not allowed in interface %s", id->toChars());
if (fbody && isVirtual())
error("function body only allowed in final functions in interface %s", id->toChars());
}
/* Contracts can only appear without a body when they are virtual interface functions
*/
if (!fbody && (fensure || frequire) && !(id && isVirtual()))
error("in and out contracts require function body");
cd = parent->isClassDeclaration();
if (cd)
{
int vi;
if (isCtorDeclaration())
{
// ctor = (CtorDeclaration *)this;
// if (!cd->ctor)
// cd->ctor = ctor;
goto Ldone;
}
if (storage_class & STCabstract)
cd->isabstract = true;
// if static function, do not put in vtbl[]
if (!isVirtual())
{
//printf("\tnot virtual\n");
goto Ldone;
}
// Suppress further errors if the return type is an error
if (type->nextOf() == Type::terror)
goto Ldone;
bool may_override = false;
for (size_t i = 0; i < cd->baseclasses->dim; i++)
{
BaseClass *b = (*cd->baseclasses)[i];
ClassDeclaration *cbd = b->type->toBasetype()->isClassHandle();
if (!cbd)
continue;
for (size_t j = 0; j < cbd->vtbl.dim; j++)
{
FuncDeclaration *f2 = cbd->vtbl[j]->isFuncDeclaration();
if (!f2 || f2->ident != ident)
continue;
if (cbd->parent && cbd->parent->isTemplateInstance())
{
if (!f2->functionSemantic())
goto Ldone;
}
may_override = true;
}
}
if (may_override && type->nextOf() == NULL)
{
/* If same name function exists in base class but 'this' is auto return,
* cannot find index of base class's vtbl[] to override.
*/
error("return type inference is not supported if may override base class function");
}
/* Find index of existing function in base class's vtbl[] to override
* (the index will be the same as in cd's current vtbl[])
*/
vi = cd->baseClass ? findVtblIndex((Dsymbols*)&cd->baseClass->vtbl, (int)cd->baseClass->vtbl.dim)
: -1;
bool doesoverride = false;
switch (vi)
{
case -1:
Lintro:
/* Didn't find one, so
* This is an 'introducing' function which gets a new
* slot in the vtbl[].
*/
// Verify this doesn't override previous final function
if (cd->baseClass)
{
Dsymbol *s = cd->baseClass->search(loc, ident);
if (s)
{
FuncDeclaration *f2 = s->isFuncDeclaration();
if (f2)
{
f2 = f2->overloadExactMatch(type);
if (f2 && f2->isFinalFunc() && f2->prot() != PROTprivate)
error("cannot override final function %s", f2->toPrettyChars());
}
}
}
if (isFinalFunc())
{
// Don't check here, as it may override an interface function
//if (isOverride())
//error("is marked as override, but does not override any function");
cd->vtblFinal.push(this);
}
else
{
//printf("\tintroducing function\n");
introducing = 1;
if (cd->cpp && Target::reverseCppOverloads)
{
// with dmc, overloaded functions are grouped and in reverse order
vtblIndex = (int)cd->vtbl.dim;
for (size_t i = 0; i < cd->vtbl.dim; i++)
{
if (cd->vtbl[i]->ident == ident && cd->vtbl[i]->parent == parent)
{
vtblIndex = (int)i;
break;
}
}
// shift all existing functions back
for (size_t i = cd->vtbl.dim; i > vtblIndex; i--)
{
FuncDeclaration *fd = cd->vtbl[i-1]->isFuncDeclaration();
assert(fd);
fd->vtblIndex++;
}
cd->vtbl.insert(vtblIndex, this);
}
else
{
// Append to end of vtbl[]
vi = (int)cd->vtbl.dim;
cd->vtbl.push(this);
vtblIndex = vi;
}
}
break;
case -2: // can't determine because of fwd refs
cd->sizeok = SIZEOKfwd; // can't finish due to forward reference
Module::dprogress = dprogress_save;
return;
default:
{ FuncDeclaration *fdv = cd->baseClass->vtbl[vi]->isFuncDeclaration();
FuncDeclaration *fdc = cd->vtbl[vi]->isFuncDeclaration();
// This function is covariant with fdv
if (fdc == this)
{
doesoverride = true;
break;
}
if (fdc->toParent() == parent)
{
//printf("vi = %d,\tthis = %p %s %s @ [%s]\n\tfdc = %p %s %s @ [%s]\n\tfdv = %p %s %s @ [%s]\n",
// vi, this, this->toChars(), this->type->toChars(), this->loc.toChars(),
// fdc, fdc ->toChars(), fdc ->type->toChars(), fdc ->loc.toChars(),
// fdv, fdv ->toChars(), fdv ->type->toChars(), fdv ->loc.toChars());
// fdc overrides fdv exactly, then this introduces new function.
if (fdc->type->mod == fdv->type->mod && this->type->mod != fdv->type->mod)
goto Lintro;
}
// This function overrides fdv
if (fdv->isFinalFunc())
error("cannot override final function %s", fdv->toPrettyChars());
doesoverride = true;
if (!isOverride())
::deprecation(loc, "overriding base class function without using override attribute is deprecated (%s overrides %s)", toPrettyChars(), fdv->toPrettyChars());
if (fdc->toParent() == parent)
{
// If both are mixins, or both are not, then error.
// If either is not, the one that is not overrides the other.
bool thismixin = this->parent->isClassDeclaration() != NULL;
bool fdcmixin = fdc->parent->isClassDeclaration() != NULL;
if (thismixin == fdcmixin)
{
error("multiple overrides of same function");
}
else if (!thismixin) // fdc overrides fdv
{ // this doesn't override any function
break;
}
}
cd->vtbl[vi] = this;
vtblIndex = vi;
/* Remember which functions this overrides
*/
foverrides.push(fdv);
/* This works by whenever this function is called,
* it actually returns tintro, which gets dynamically
* cast to type. But we know that tintro is a base
* of type, so we could optimize it by not doing a
* dynamic cast, but just subtracting the isBaseOf()
* offset if the value is != null.
*/
if (fdv->tintro)
tintro = fdv->tintro;
else if (!type->equals(fdv->type))
{
/* Only need to have a tintro if the vptr
* offsets differ
*/
int offset;
if (fdv->type->nextOf()->isBaseOf(type->nextOf(), &offset))
{
tintro = fdv->type;
}
}
break;
}
}
/* Go through all the interface bases.
* If this function is covariant with any members of those interface
* functions, set the tintro.
*/
for (size_t i = 0; i < cd->interfaces_dim; i++)
{
BaseClass *b = cd->interfaces[i];
vi = findVtblIndex((Dsymbols *)&b->base->vtbl, (int)b->base->vtbl.dim);
switch (vi)
{
case -1:
break;
case -2:
cd->sizeok = SIZEOKfwd; // can't finish due to forward reference
Module::dprogress = dprogress_save;
return;
default:
{ FuncDeclaration *fdv = (FuncDeclaration *)b->base->vtbl[vi];
Type *ti = NULL;
/* Remember which functions this overrides
*/
foverrides.push(fdv);
/* Should we really require 'override' when implementing
* an interface function?
*/
//if (!isOverride())
//warning(loc, "overrides base class function %s, but is not marked with 'override'", fdv->toPrettyChars());
if (fdv->tintro)
ti = fdv->tintro;
else if (!type->equals(fdv->type))
{
/* Only need to have a tintro if the vptr
* offsets differ
*/
unsigned errors = global.errors;
global.gag++; // suppress printing of error messages
int offset;
int baseOf = fdv->type->nextOf()->isBaseOf(type->nextOf(), &offset);
global.gag--; // suppress printing of error messages
if (errors != global.errors)
{
// any error in isBaseOf() is a forward reference error, so we bail out
global.errors = errors;
cd->sizeok = SIZEOKfwd; // can't finish due to forward reference
Module::dprogress = dprogress_save;
return;
}
if (baseOf)
{
ti = fdv->type;
}
}
if (ti)
{
if (tintro)
{
if (!tintro->nextOf()->equals(ti->nextOf()) &&
!tintro->nextOf()->isBaseOf(ti->nextOf(), NULL) &&
!ti->nextOf()->isBaseOf(tintro->nextOf(), NULL))
{
error("incompatible covariant types %s and %s", tintro->toChars(), ti->toChars());
}
}
tintro = ti;
}
goto L2;
}
}
}
if (!doesoverride && isOverride() && type->nextOf())
{
Dsymbol *s = NULL;
for (size_t i = 0; i < cd->baseclasses->dim; i++)
{
s = (*cd->baseclasses)[i]->base->search_correct(ident);
if (s) break;
}
if (s)
error("does not override any function, did you mean to override '%s'?", s->toPrettyChars());
else
error("does not override any function");
}
L2: ;
/* Go through all the interface bases.
* Disallow overriding any final functions in the interface(s).
*/
for (size_t i = 0; i < cd->interfaces_dim; i++)
{
BaseClass *b = cd->interfaces[i];
if (b->base)
{
Dsymbol *s = search_function(b->base, ident);
if (s)
{
FuncDeclaration *f2 = s->isFuncDeclaration();
if (f2)
{
f2 = f2->overloadExactMatch(type);
if (f2 && f2->isFinalFunc() && f2->prot() != PROTprivate)