-
-
Notifications
You must be signed in to change notification settings - Fork 593
/
expressionsem.d
14019 lines (12672 loc) · 470 KB
/
expressionsem.d
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
/**
* Semantic analysis of expressions.
*
* Specification: ($LINK2 https://dlang.org/spec/expression.html, Expressions)
*
* Copyright: Copyright (C) 1999-2023 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 https://www.digitalmars.com, Walter Bright)
* License: $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/expressionsem.d, _expressionsem.d)
* Documentation: https://dlang.org/phobos/dmd_expressionsem.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/expressionsem.d
*/
module dmd.expressionsem;
import core.stdc.stdio;
import dmd.access;
import dmd.aggregate;
import dmd.aliasthis;
import dmd.arrayop;
import dmd.arraytypes;
import dmd.attrib;
import dmd.astcodegen;
import dmd.astenums;
import dmd.canthrow;
import dmd.chkformat;
import dmd.ctorflow;
import dmd.dscope;
import dmd.dsymbol;
import dmd.declaration;
import dmd.dclass;
import dmd.dcast;
import dmd.delegatize;
import dmd.denum;
import dmd.dimport;
import dmd.dinterpret;
import dmd.dmangle;
import dmd.dmodule;
import dmd.dstruct;
import dmd.dsymbolsem;
import dmd.dtemplate;
import dmd.errors;
import dmd.escape;
import dmd.expression;
import dmd.file_manager;
import dmd.func;
import dmd.globals;
import dmd.hdrgen;
import dmd.id;
import dmd.identifier;
import dmd.imphint;
import dmd.importc;
import dmd.init;
import dmd.initsem;
import dmd.inline;
import dmd.intrange;
import dmd.location;
import dmd.mtype;
import dmd.mustuse;
import dmd.nspace;
import dmd.opover;
import dmd.optimize;
import dmd.parse;
import dmd.printast;
import dmd.root.array;
import dmd.root.ctfloat;
import dmd.root.filename;
import dmd.common.outbuffer;
import dmd.root.rootobject;
import dmd.root.string;
import dmd.root.utf;
import dmd.semantic2;
import dmd.semantic3;
import dmd.sideeffect;
import dmd.safe;
import dmd.target;
import dmd.tokens;
import dmd.traits;
import dmd.typesem;
import dmd.typinf;
import dmd.utils;
import dmd.visitor;
enum LOGSEMANTIC = false;
/********************************************************
* Perform semantic analysis and CTFE on expressions to produce
* a string.
* Params:
* buf = append generated string to buffer
* sc = context
* exps = array of Expressions
* Returns:
* true on error
*/
bool expressionsToString(ref OutBuffer buf, Scope* sc, Expressions* exps)
{
if (!exps)
return false;
foreach (ex; *exps)
{
if (!ex)
continue;
auto sc2 = sc.startCTFE();
sc2.tinst = null;
sc2.minst = null; // prevents emission of any instantiated templates to object file
auto e2 = ex.expressionSemantic(sc2);
auto e3 = resolveProperties(sc2, e2);
sc2.endCTFE();
// allowed to contain types as well as expressions
auto e4 = ctfeInterpretForPragmaMsg(e3);
if (!e4 || e4.op == EXP.error)
return true;
// expand tuple
if (auto te = e4.isTupleExp())
{
if (expressionsToString(buf, sc, te.exps))
return true;
continue;
}
// char literals exp `.toStringExp` return `null` but we cant override it
// because in most contexts we don't want the conversion to succeed.
IntegerExp ie = e4.isIntegerExp();
const ty = (ie && ie.type) ? ie.type.ty : Terror;
if (ty.isSomeChar)
{
auto tsa = new TypeSArray(ie.type, IntegerExp.literal!1);
e4 = new ArrayLiteralExp(ex.loc, tsa, ie);
}
if (StringExp se = e4.toStringExp())
buf.writestring(se.toUTF8(sc).peekString());
else
buf.writestring(e4.toString());
}
return false;
}
/***********************************************************
* Resolve `exp` as a compile-time known string.
* Params:
* sc = scope
* exp = Expression which expected as a string
* s = What the string is expected for, will be used in error diagnostic.
* Returns:
* String literal, or `null` if error happens.
*/
StringExp semanticString(Scope *sc, Expression exp, const char* s)
{
sc = sc.startCTFE();
exp = exp.expressionSemantic(sc);
exp = resolveProperties(sc, exp);
sc = sc.endCTFE();
if (exp.op == EXP.error)
return null;
auto e = exp;
if (exp.type.isString())
{
e = e.ctfeInterpret();
if (e.op == EXP.error)
return null;
}
auto se = e.toStringExp();
if (!se)
{
exp.error("`string` expected for %s, not `(%s)` of type `%s`",
s, exp.toChars(), exp.type.toChars());
return null;
}
return se;
}
private Expression extractOpDollarSideEffect(Scope* sc, UnaExp ue)
{
Expression e0;
Expression e1 = Expression.extractLast(ue.e1, e0);
// https://issues.dlang.org/show_bug.cgi?id=12585
// Extract the side effect part if ue.e1 is comma.
if ((sc.flags & SCOPE.ctfe) ? hasSideEffect(e1) : !isTrivialExp(e1)) // match logic in extractSideEffect()
{
/* Even if opDollar is needed, 'e1' should be evaluate only once. So
* Rewrite:
* e1.opIndex( ... use of $ ... )
* e1.opSlice( ... use of $ ... )
* as:
* (ref __dop = e1, __dop).opIndex( ... __dop.opDollar ...)
* (ref __dop = e1, __dop).opSlice( ... __dop.opDollar ...)
*/
e1 = extractSideEffect(sc, "__dop", e0, e1, false);
assert(e1.isVarExp());
e1.isVarExp().var.storage_class |= STC.exptemp; // lifetime limited to expression
}
ue.e1 = e1;
return e0;
}
/**************************************
* Runs semantic on ae.arguments. Declares temporary variables
* if '$' was used.
*/
Expression resolveOpDollar(Scope* sc, ArrayExp ae, Expression* pe0)
{
assert(!ae.lengthVar);
*pe0 = null;
AggregateDeclaration ad = isAggregate(ae.e1.type);
Dsymbol slice = search_function(ad, Id.slice);
//printf("slice = %s %s\n", slice.kind(), slice.toChars());
foreach (i, e; *ae.arguments)
{
if (i == 0)
*pe0 = extractOpDollarSideEffect(sc, ae);
if (e.op == EXP.interval && !(slice && slice.isTemplateDeclaration()))
{
Lfallback:
if (ae.arguments.length == 1)
return null;
ae.error("multi-dimensional slicing requires template `opSlice`");
return ErrorExp.get();
}
//printf("[%d] e = %s\n", i, e.toChars());
// Create scope for '$' variable for this dimension
auto sym = new ArrayScopeSymbol(sc, ae);
sym.parent = sc.scopesym;
sc = sc.push(sym);
ae.lengthVar = null; // Create it only if required
ae.currentDimension = i; // Dimension for $, if required
e = e.expressionSemantic(sc);
e = resolveProperties(sc, e);
if (ae.lengthVar && sc.func)
{
// If $ was used, declare it now
Expression de = new DeclarationExp(ae.loc, ae.lengthVar);
de = de.expressionSemantic(sc);
*pe0 = Expression.combine(*pe0, de);
}
sc = sc.pop();
if (auto ie = e.isIntervalExp())
{
auto tiargs = new Objects();
Expression edim = new IntegerExp(ae.loc, i, Type.tsize_t);
edim = edim.expressionSemantic(sc);
tiargs.push(edim);
auto fargs = new Expressions(2);
(*fargs)[0] = ie.lwr;
(*fargs)[1] = ie.upr;
uint xerrors = global.startGagging();
sc = sc.push();
FuncDeclaration fslice = resolveFuncCall(ae.loc, sc, slice, tiargs, ae.e1.type, ArgumentList(fargs), FuncResolveFlag.quiet);
sc = sc.pop();
global.endGagging(xerrors);
if (!fslice)
goto Lfallback;
e = new DotTemplateInstanceExp(ae.loc, ae.e1, slice.ident, tiargs);
e = new CallExp(ae.loc, e, fargs);
e = e.expressionSemantic(sc);
}
if (!e.type)
{
ae.error("`%s` has no value", e.toChars());
e = ErrorExp.get();
}
if (e.op == EXP.error)
return e;
(*ae.arguments)[i] = e;
}
return ae;
}
/**************************************
* Runs semantic on se.lwr and se.upr. Declares a temporary variable
* if '$' was used.
* Returns:
* ae, or ErrorExp if errors occurred
*/
Expression resolveOpDollar(Scope* sc, ArrayExp ae, IntervalExp ie, Expression* pe0)
{
//assert(!ae.lengthVar);
if (!ie)
return ae;
VarDeclaration lengthVar = ae.lengthVar;
bool errors = false;
// create scope for '$'
auto sym = new ArrayScopeSymbol(sc, ae);
sym.parent = sc.scopesym;
sc = sc.push(sym);
Expression sem(Expression e)
{
e = e.expressionSemantic(sc);
e = resolveProperties(sc, e);
if (!e.type)
{
ae.error("`%s` has no value", e.toChars());
errors = true;
}
return e;
}
ie.lwr = sem(ie.lwr);
ie.upr = sem(ie.upr);
if (ie.lwr.isErrorExp() || ie.upr.isErrorExp())
errors = true;
if (lengthVar != ae.lengthVar && sc.func)
{
// If $ was used, declare it now
Expression de = new DeclarationExp(ae.loc, ae.lengthVar);
de = de.expressionSemantic(sc);
*pe0 = Expression.combine(*pe0, de);
}
sc = sc.pop();
return errors ? ErrorExp.get() : ae;
}
/******************************
* Perform semantic() on an array of Expressions.
*/
extern(D) bool arrayExpressionSemantic(
Expression[] exps, Scope* sc, bool preserveErrors = false)
{
bool err = false;
foreach (ref e; exps)
{
if (e is null) continue;
auto e2 = e.expressionSemantic(sc);
if (e2.op == EXP.error)
err = true;
if (preserveErrors || e2.op != EXP.error)
e = e2;
}
return err;
}
/*
Checks if `exp` contains a direct access to a `noreturn`
variable. If that is the case, an `assert(0)` expression
is generated and returned. This function should be called
only after semantic analysis has been performed on `exp`.
Params:
exp = expression that is checked
Returns:
An `assert(0)` expression if `exp` contains a `noreturn`
variable access, `exp` otherwise.
*/
Expression checkNoreturnVarAccess(Expression exp)
{
assert(exp.type);
Expression result = exp;
if (exp.type.isTypeNoreturn() && !exp.isAssertExp() &&
!exp.isThrowExp() && !exp.isCallExp())
{
auto msg = new StringExp(exp.loc, "Accessed expression of type `noreturn`");
msg.type = Type.tstring;
result = new AssertExp(exp.loc, IntegerExp.literal!0, msg);
result.type = exp.type;
}
return result;
}
/******************************
* Check the tail CallExp is really property function call.
* Bugs:
* This doesn't appear to do anything.
*/
private bool checkPropertyCall(Expression e)
{
e = lastComma(e);
if (auto ce = e.isCallExp())
{
if (ce.f)
{
auto tf = ce.f.type.isTypeFunction();
/* If a forward reference to ce.f, try to resolve it
*/
if (!tf.deco && ce.f.semanticRun < PASS.semanticdone)
{
ce.f.dsymbolSemantic(null);
tf = ce.f.type.isTypeFunction();
}
}
else if (!ce.e1.type.isFunction_Delegate_PtrToFunction())
assert(0);
}
return false;
}
/******************************
* Find symbol in accordance with the UFCS name look up rule
*/
private Expression searchUFCS(Scope* sc, UnaExp ue, Identifier ident)
{
//printf("searchUFCS(ident = %s)\n", ident.toChars());
Loc loc = ue.loc;
// TODO: merge with Scope.search.searchScopes()
Dsymbol searchScopes(int flags)
{
Dsymbol s = null;
for (Scope* scx = sc; scx; scx = scx.enclosing)
{
if (!scx.scopesym)
continue;
if (scx.scopesym.isModule())
flags |= SearchUnqualifiedModule; // tell Module.search() that SearchLocalsOnly is to be obeyed
s = scx.scopesym.search(loc, ident, flags);
if (s)
{
// overload set contains only module scope symbols.
if (s.isOverloadSet())
break;
// selective/renamed imports also be picked up
if (AliasDeclaration ad = s.isAliasDeclaration())
{
if (ad._import)
break;
}
// See only module scope symbols for UFCS target.
Dsymbol p = s.toParent2();
if (p && p.isModule())
break;
}
s = null;
// Stop when we hit a module, but keep going if that is not just under the global scope
if (scx.scopesym.isModule() && !(scx.enclosing && !scx.enclosing.enclosing))
break;
}
return s;
}
int flags = 0;
Dsymbol s;
if (sc.flags & SCOPE.ignoresymbolvisibility)
flags |= IgnoreSymbolVisibility;
// First look in local scopes
s = searchScopes(flags | SearchLocalsOnly);
if (!s)
{
// Second look in imported modules
s = searchScopes(flags | SearchImportsOnly);
}
if (!s)
return ue.e1.type.getProperty(sc, loc, ident, 0, ue.e1);
FuncDeclaration f = s.isFuncDeclaration();
if (f)
{
TemplateDeclaration td = getFuncTemplateDecl(f);
if (td)
{
if (td.overroot)
td = td.overroot;
s = td;
}
}
if (auto dti = ue.isDotTemplateInstanceExp())
{
auto ti = new TemplateInstance(loc, s.ident, dti.ti.tiargs);
if (!ti.updateTempDecl(sc, s))
return ErrorExp.get();
return new ScopeExp(loc, ti);
}
else
{
//printf("-searchUFCS() %s\n", s.toChars());
return new DsymbolExp(loc, s);
}
}
/******************************
* Pull out callable entity with UFCS.
*/
private Expression resolveUFCS(Scope* sc, CallExp ce)
{
Loc loc = ce.loc;
Expression eleft;
Expression e;
if (auto die = ce.e1.isDotIdExp())
{
Identifier ident = die.ident;
Expression ex = die.dotIdSemanticPropX(sc);
if (ex != die)
{
ce.e1 = ex;
return null;
}
eleft = die.e1;
Type t = eleft.type.toBasetype();
if (t.ty == Tarray || t.ty == Tsarray || t.ty == Tnull || (t.isTypeBasic() && t.ty != Tvoid))
{
/* Built-in types and arrays have no callable properties, so do shortcut.
* It is necessary in: e.init()
*/
}
else if (t.ty == Taarray)
{
if (ident == Id.remove)
{
/* Transform:
* aa.remove(arg) into delete aa[arg]
*/
if (!ce.arguments || ce.arguments.length != 1)
{
ce.error("expected key as argument to `aa.remove()`");
return ErrorExp.get();
}
if (!eleft.type.isMutable())
{
ce.error("cannot remove key from `%s` associative array `%s`", MODtoChars(t.mod), eleft.toChars());
return ErrorExp.get();
}
Expression key = (*ce.arguments)[0];
key = key.expressionSemantic(sc);
key = resolveProperties(sc, key);
TypeAArray taa = t.isTypeAArray();
key = key.implicitCastTo(sc, taa.index);
if (key.checkValue() || key.checkSharedAccess(sc))
return ErrorExp.get();
semanticTypeInfo(sc, taa.index);
return new RemoveExp(loc, eleft, key);
}
}
else
{
if (Expression ey = die.dotIdSemanticProp(sc, 1))
{
if (ey.op == EXP.error)
return ey;
ce.e1 = ey;
if (isDotOpDispatch(ey))
{
// even opDispatch and UFCS must have valid arguments,
// so now that we've seen indication of a problem,
// check them for issues.
Expressions* originalArguments = Expression.arraySyntaxCopy(ce.arguments);
uint errors = global.startGagging();
e = ce.expressionSemantic(sc);
if (!global.endGagging(errors))
return e;
if (arrayExpressionSemantic(originalArguments.peekSlice(), sc))
return ErrorExp.get();
/* fall down to UFCS */
}
else
return null;
}
}
/* https://issues.dlang.org/show_bug.cgi?id=13953
*
* If a struct has an alias this to an associative array
* and remove is used on a struct instance, we have to
* check first if there is a remove function that can be called
* on the struct. If not we must check the alias this.
*
* struct A
* {
* string[string] a;
* alias a this;
* }
*
* void fun()
* {
* A s;
* s.remove("foo");
* }
*/
const errors = global.startGagging();
e = searchUFCS(sc, die, ident);
// if there were any errors and the identifier was remove
if (global.endGagging(errors))
{
if (ident == Id.remove)
{
// check alias this
Expression alias_e = resolveAliasThis(sc, die.e1, 1);
if (alias_e && alias_e != die.e1)
{
die.e1 = alias_e;
CallExp ce2 = ce.syntaxCopy();
ce2.e1 = die;
e = ce2.isCallExp().trySemantic(sc);
if (e)
return e;
}
}
// if alias this did not work out, print the initial errors
searchUFCS(sc, die, ident);
}
}
else if (auto dti = ce.e1.isDotTemplateInstanceExp())
{
if (Expression ey = dti.dotTemplateSemanticProp(sc, 1))
{
ce.e1 = ey;
return null;
}
eleft = dti.e1;
e = searchUFCS(sc, dti, dti.ti.name);
}
else
return null;
// Rewrite
ce.e1 = e;
if (!ce.arguments)
ce.arguments = new Expressions();
ce.arguments.shift(eleft);
if (!ce.names)
ce.names = new Identifiers();
ce.names.shift(null);
return null;
}
/******************************
* Pull out property with UFCS.
*/
private Expression resolveUFCSProperties(Scope* sc, Expression e1, Expression e2 = null)
{
Loc loc = e1.loc;
Expression eleft;
Expression e;
if (auto die = e1.isDotIdExp())
{
eleft = die.e1;
e = searchUFCS(sc, die, die.ident);
}
else if (auto dti = e1.isDotTemplateInstanceExp())
{
eleft = dti.e1;
e = searchUFCS(sc, dti, dti.ti.name);
}
else
return null;
if (e is null)
return null;
// Rewrite
if (e2)
{
// run semantic without gagging
e2 = e2.expressionSemantic(sc);
/* f(e1) = e2
*/
Expression ex = e.copy();
auto a1 = new Expressions(1);
(*a1)[0] = eleft;
ex = new CallExp(loc, ex, a1);
auto e1PassSemantic = ex.trySemantic(sc);
/* f(e1, e2)
*/
auto a2 = new Expressions(2);
(*a2)[0] = eleft;
(*a2)[1] = e2;
e = new CallExp(loc, e, a2);
e = e.trySemantic(sc);
if (!e1PassSemantic && !e)
{
/* https://issues.dlang.org/show_bug.cgi?id=20448
*
* If both versions have failed to pass semantic,
* f(e1) = e2 gets priority in error printing
* because f might be a templated function that
* failed to instantiate and we have to print
* the instantiation errors.
*/
return e1.expressionSemantic(sc);
}
else if (ex && !e)
{
checkPropertyCall(ex);
ex = new AssignExp(loc, ex, e2);
return ex.expressionSemantic(sc);
}
else
{
// strict setter prints errors if fails
e = e.expressionSemantic(sc);
}
checkPropertyCall(e);
return e;
}
else
{
/* f(e1)
*/
auto arguments = new Expressions(1);
(*arguments)[0] = eleft;
e = new CallExp(loc, e, arguments);
e = e.expressionSemantic(sc);
checkPropertyCall(e);
return e.expressionSemantic(sc);
}
}
/******************************
* If e1 is a property function (template), resolve it.
*/
Expression resolvePropertiesOnly(Scope* sc, Expression e1)
{
//printf("e1 = %s %s\n", Token.toChars(e1.op), e1.toChars());
Expression handleOverloadSet(OverloadSet os)
{
assert(os);
foreach (s; os.a)
{
auto fd = s.isFuncDeclaration();
auto td = s.isTemplateDeclaration();
if (fd)
{
if (fd.type.isTypeFunction().isproperty)
return resolveProperties(sc, e1);
}
else if (td && td.onemember && (fd = td.onemember.isFuncDeclaration()) !is null)
{
if (fd.type.isTypeFunction().isproperty ||
(fd.storage_class2 & STC.property) ||
(td._scope.stc & STC.property))
return resolveProperties(sc, e1);
}
}
return e1;
}
Expression handleTemplateDecl(TemplateDeclaration td)
{
assert(td);
if (td.onemember)
{
if (auto fd = td.onemember.isFuncDeclaration())
{
if (fd.type.isTypeFunction().isproperty ||
(fd.storage_class2 & STC.property) ||
(td._scope.stc & STC.property))
return resolveProperties(sc, e1);
}
}
return e1;
}
Expression handleFuncDecl(FuncDeclaration fd)
{
assert(fd);
if (fd.type.isTypeFunction().isproperty)
return resolveProperties(sc, e1);
return e1;
}
if (auto de = e1.isDotExp())
{
if (auto os = de.e2.isOverExp())
return handleOverloadSet(os.vars);
}
else if (auto oe = e1.isOverExp())
return handleOverloadSet(oe.vars);
else if (auto dti = e1.isDotTemplateInstanceExp())
{
if (dti.ti.tempdecl)
if (auto td = dti.ti.tempdecl.isTemplateDeclaration())
return handleTemplateDecl(td);
}
else if (auto dte = e1.isDotTemplateExp())
return handleTemplateDecl(dte.td);
else if (auto se = e1.isScopeExp())
{
Dsymbol s = se.sds;
TemplateInstance ti = s.isTemplateInstance();
if (ti && !ti.semanticRun && ti.tempdecl)
if (auto td = ti.tempdecl.isTemplateDeclaration())
return handleTemplateDecl(td);
}
else if (auto et = e1.isTemplateExp())
return handleTemplateDecl(et.td);
else if (e1.isDotVarExp() && e1.type.isTypeFunction())
{
DotVarExp dve = e1.isDotVarExp();
return handleFuncDecl(dve.var.isFuncDeclaration());
}
else if (e1.isVarExp() && e1.type && e1.type.isTypeFunction() && (sc.intypeof || !e1.isVarExp().var.needThis()))
return handleFuncDecl(e1.isVarExp().var.isFuncDeclaration());
return e1;
}
/****************************************
* Turn symbol `s` into the expression it represents.
*
* Params:
* s = symbol to resolve
* loc = location of use of `s`
* sc = context
* hasOverloads = applies if `s` represents a function.
* true means it's overloaded and will be resolved later,
* false means it's the exact function symbol.
* Returns:
* `s` turned into an expression, `ErrorExp` if an error occurred
*/
Expression symbolToExp(Dsymbol s, const ref Loc loc, Scope *sc, bool hasOverloads)
{
static if (LOGSEMANTIC)
{
printf("DsymbolExp::resolve(%s %s)\n", s.kind(), s.toChars());
}
Lagain:
Expression e;
//printf("DsymbolExp:: %p '%s' is a symbol\n", this, toChars());
//printf("s = '%s', s.kind = '%s'\n", s.toChars(), s.kind());
Dsymbol olds = s;
Declaration d = s.isDeclaration();
if (d && (d.storage_class & STC.templateparameter))
{
s = s.toAlias();
}
else
{
// functions are checked after overloading
// templates are checked after matching constraints
if (!s.isFuncDeclaration() && !s.isTemplateDeclaration())
{
s.checkDeprecated(loc, sc);
if (d)
d.checkDisabled(loc, sc);
}
// https://issues.dlang.org/show_bug.cgi?id=12023
// if 's' is a tuple variable, the tuple is returned.
s = s.toAlias();
//printf("s = '%s', s.kind = '%s', s.needThis() = %p\n", s.toChars(), s.kind(), s.needThis());
if (s != olds && !s.isFuncDeclaration() && !s.isTemplateDeclaration())
{
s.checkDeprecated(loc, sc);
if (d)
d.checkDisabled(loc, sc);
}
if (auto sd = s.isDeclaration())
{
if (sd.isSystem())
{
if (sc.setUnsafePreview(global.params.systemVariables, false, loc,
"cannot access `@system` variable `%s` in @safe code", sd))
{
return ErrorExp.get();
}
}
}
}
if (auto em = s.isEnumMember())
{
return em.getVarExp(loc, sc);
}
if (auto v = s.isVarDeclaration())
{
//printf("Identifier '%s' is a variable, type '%s'\n", s.toChars(), v.type.toChars());
if (sc.intypeof == 1 && !v.inuse)
v.dsymbolSemantic(sc);
if (!v.type || // during variable type inference
!v.type.deco && v.inuse) // during variable type semantic
{
if (v.inuse) // variable type depends on the variable itself
error(loc, "circular reference to %s `%s`", v.kind(), v.toPrettyChars());
else // variable type cannot be determined
error(loc, "forward reference to %s `%s`", v.kind(), v.toPrettyChars());
return ErrorExp.get();
}
if (v.type.ty == Terror)
return ErrorExp.get();
if ((v.storage_class & STC.manifest) && v._init)
{
if (v.inuse)
{
error(loc, "circular initialization of %s `%s`", v.kind(), v.toPrettyChars());
return ErrorExp.get();
}
e = v.expandInitializer(loc);
v.inuse++;
e = e.expressionSemantic(sc);
v.inuse--;
return e;
}
// We need to run semantics to correctly set 'STC.field' if it is a member variable
// that could be forward referenced. This is needed for 'v.needThis()' to work
if (v.isThis())
v.dsymbolSemantic(sc);
// Change the ancestor lambdas to delegate before hasThis(sc) call.
if (v.checkNestedReference(sc, loc))
return ErrorExp.get();
if (v.needThis() && hasThis(sc))
e = new DotVarExp(loc, new ThisExp(loc), v);
else
e = new VarExp(loc, v);
e = e.expressionSemantic(sc);
return e;
}
if (auto fld = s.isFuncLiteralDeclaration())
{
//printf("'%s' is a function literal\n", fld.toChars());
e = new FuncExp(loc, fld);
return e.expressionSemantic(sc);
}
if (auto f = s.isFuncDeclaration())
{
f = f.toAliasFunc();
if (!f.functionSemantic())
return ErrorExp.get();
if (!hasOverloads && f.checkForwardRef(loc))
return ErrorExp.get();
auto fd = s.isFuncDeclaration();
fd.type = f.type;
return new VarExp(loc, fd, hasOverloads);
}
if (OverDeclaration od = s.isOverDeclaration())
{
e = new VarExp(loc, od, true);
e.type = Type.tvoid;
return e;
}
if (OverloadSet o = s.isOverloadSet())
{
//printf("'%s' is an overload set\n", o.toChars());
return new OverExp(loc, o);
}
if (Import imp = s.isImport())
{
if (!imp.pkg)
{
.error(loc, "forward reference of import `%s`", imp.toChars());
return ErrorExp.get();
}
auto ie = new ScopeExp(loc, imp.pkg);
return ie.expressionSemantic(sc);
}
if (Package pkg = s.isPackage())
{
auto ie = new ScopeExp(loc, pkg);
return ie.expressionSemantic(sc);
}
if (Module mod = s.isModule())
{
auto ie = new ScopeExp(loc, mod);