Bug Summary

File:build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/clang/lib/Sema/SemaInit.cpp
Warning:line 9117, column 37
Called C++ object pointer is null

Annotated Source Code

Press '?' to see keyboard shortcuts

clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name SemaInit.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm -resource-dir /usr/lib/llvm-15/lib/clang/15.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/clang/lib/Sema -I /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/clang/include -I tools/clang/include -I include -I /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/llvm/include -D _FORTIFY_SOURCE=2 -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-15/lib/clang/15.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm=build-llvm -fmacro-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/= -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm=build-llvm -fcoverage-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/= -O3 -Wno-unused-command-line-argument -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm -fdebug-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/build-llvm=build-llvm -fdebug-prefix-map=/build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2022-04-20-140412-16051-1 -x c++ /build/llvm-toolchain-snapshot-15~++20220420111733+e13d2efed663/clang/lib/Sema/SemaInit.cpp
1//===--- SemaInit.cpp - Semantic Analysis for Initializers ----------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements semantic analysis for initializers.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/AST/ASTContext.h"
14#include "clang/AST/DeclObjC.h"
15#include "clang/AST/ExprCXX.h"
16#include "clang/AST/ExprObjC.h"
17#include "clang/AST/ExprOpenMP.h"
18#include "clang/AST/TypeLoc.h"
19#include "clang/Basic/CharInfo.h"
20#include "clang/Basic/SourceManager.h"
21#include "clang/Basic/TargetInfo.h"
22#include "clang/Sema/Designator.h"
23#include "clang/Sema/Initialization.h"
24#include "clang/Sema/Lookup.h"
25#include "clang/Sema/SemaInternal.h"
26#include "llvm/ADT/APInt.h"
27#include "llvm/ADT/PointerIntPair.h"
28#include "llvm/ADT/SmallString.h"
29#include "llvm/Support/ErrorHandling.h"
30#include "llvm/Support/raw_ostream.h"
31
32using namespace clang;
33
34//===----------------------------------------------------------------------===//
35// Sema Initialization Checking
36//===----------------------------------------------------------------------===//
37
38/// Check whether T is compatible with a wide character type (wchar_t,
39/// char16_t or char32_t).
40static bool IsWideCharCompatible(QualType T, ASTContext &Context) {
41 if (Context.typesAreCompatible(Context.getWideCharType(), T))
42 return true;
43 if (Context.getLangOpts().CPlusPlus || Context.getLangOpts().C11) {
44 return Context.typesAreCompatible(Context.Char16Ty, T) ||
45 Context.typesAreCompatible(Context.Char32Ty, T);
46 }
47 return false;
48}
49
50enum StringInitFailureKind {
51 SIF_None,
52 SIF_NarrowStringIntoWideChar,
53 SIF_WideStringIntoChar,
54 SIF_IncompatWideStringIntoWideChar,
55 SIF_UTF8StringIntoPlainChar,
56 SIF_PlainStringIntoUTF8Char,
57 SIF_Other
58};
59
60/// Check whether the array of type AT can be initialized by the Init
61/// expression by means of string initialization. Returns SIF_None if so,
62/// otherwise returns a StringInitFailureKind that describes why the
63/// initialization would not work.
64static StringInitFailureKind IsStringInit(Expr *Init, const ArrayType *AT,
65 ASTContext &Context) {
66 if (!isa<ConstantArrayType>(AT) && !isa<IncompleteArrayType>(AT))
67 return SIF_Other;
68
69 // See if this is a string literal or @encode.
70 Init = Init->IgnoreParens();
71
72 // Handle @encode, which is a narrow string.
73 if (isa<ObjCEncodeExpr>(Init) && AT->getElementType()->isCharType())
74 return SIF_None;
75
76 // Otherwise we can only handle string literals.
77 StringLiteral *SL = dyn_cast<StringLiteral>(Init);
78 if (!SL)
79 return SIF_Other;
80
81 const QualType ElemTy =
82 Context.getCanonicalType(AT->getElementType()).getUnqualifiedType();
83
84 switch (SL->getKind()) {
85 case StringLiteral::UTF8:
86 // char8_t array can be initialized with a UTF-8 string.
87 if (ElemTy->isChar8Type())
88 return SIF_None;
89 LLVM_FALLTHROUGH[[gnu::fallthrough]];
90 case StringLiteral::Ascii:
91 // char array can be initialized with a narrow string.
92 // Only allow char x[] = "foo"; not char x[] = L"foo";
93 if (ElemTy->isCharType())
94 return (SL->getKind() == StringLiteral::UTF8 &&
95 Context.getLangOpts().Char8)
96 ? SIF_UTF8StringIntoPlainChar
97 : SIF_None;
98 if (ElemTy->isChar8Type())
99 return SIF_PlainStringIntoUTF8Char;
100 if (IsWideCharCompatible(ElemTy, Context))
101 return SIF_NarrowStringIntoWideChar;
102 return SIF_Other;
103 // C99 6.7.8p15 (with correction from DR343), or C11 6.7.9p15:
104 // "An array with element type compatible with a qualified or unqualified
105 // version of wchar_t, char16_t, or char32_t may be initialized by a wide
106 // string literal with the corresponding encoding prefix (L, u, or U,
107 // respectively), optionally enclosed in braces.
108 case StringLiteral::UTF16:
109 if (Context.typesAreCompatible(Context.Char16Ty, ElemTy))
110 return SIF_None;
111 if (ElemTy->isCharType() || ElemTy->isChar8Type())
112 return SIF_WideStringIntoChar;
113 if (IsWideCharCompatible(ElemTy, Context))
114 return SIF_IncompatWideStringIntoWideChar;
115 return SIF_Other;
116 case StringLiteral::UTF32:
117 if (Context.typesAreCompatible(Context.Char32Ty, ElemTy))
118 return SIF_None;
119 if (ElemTy->isCharType() || ElemTy->isChar8Type())
120 return SIF_WideStringIntoChar;
121 if (IsWideCharCompatible(ElemTy, Context))
122 return SIF_IncompatWideStringIntoWideChar;
123 return SIF_Other;
124 case StringLiteral::Wide:
125 if (Context.typesAreCompatible(Context.getWideCharType(), ElemTy))
126 return SIF_None;
127 if (ElemTy->isCharType() || ElemTy->isChar8Type())
128 return SIF_WideStringIntoChar;
129 if (IsWideCharCompatible(ElemTy, Context))
130 return SIF_IncompatWideStringIntoWideChar;
131 return SIF_Other;
132 }
133
134 llvm_unreachable("missed a StringLiteral kind?")::llvm::llvm_unreachable_internal("missed a StringLiteral kind?"
, "clang/lib/Sema/SemaInit.cpp", 134)
;
135}
136
137static StringInitFailureKind IsStringInit(Expr *init, QualType declType,
138 ASTContext &Context) {
139 const ArrayType *arrayType = Context.getAsArrayType(declType);
140 if (!arrayType)
141 return SIF_Other;
142 return IsStringInit(init, arrayType, Context);
143}
144
145bool Sema::IsStringInit(Expr *Init, const ArrayType *AT) {
146 return ::IsStringInit(Init, AT, Context) == SIF_None;
147}
148
149/// Update the type of a string literal, including any surrounding parentheses,
150/// to match the type of the object which it is initializing.
151static void updateStringLiteralType(Expr *E, QualType Ty) {
152 while (true) {
153 E->setType(Ty);
154 E->setValueKind(VK_PRValue);
155 if (isa<StringLiteral>(E) || isa<ObjCEncodeExpr>(E)) {
156 break;
157 } else if (ParenExpr *PE = dyn_cast<ParenExpr>(E)) {
158 E = PE->getSubExpr();
159 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
160 assert(UO->getOpcode() == UO_Extension)(static_cast <bool> (UO->getOpcode() == UO_Extension
) ? void (0) : __assert_fail ("UO->getOpcode() == UO_Extension"
, "clang/lib/Sema/SemaInit.cpp", 160, __extension__ __PRETTY_FUNCTION__
))
;
161 E = UO->getSubExpr();
162 } else if (GenericSelectionExpr *GSE = dyn_cast<GenericSelectionExpr>(E)) {
163 E = GSE->getResultExpr();
164 } else if (ChooseExpr *CE = dyn_cast<ChooseExpr>(E)) {
165 E = CE->getChosenSubExpr();
166 } else {
167 llvm_unreachable("unexpected expr in string literal init")::llvm::llvm_unreachable_internal("unexpected expr in string literal init"
, "clang/lib/Sema/SemaInit.cpp", 167)
;
168 }
169 }
170}
171
172/// Fix a compound literal initializing an array so it's correctly marked
173/// as an rvalue.
174static void updateGNUCompoundLiteralRValue(Expr *E) {
175 while (true) {
176 E->setValueKind(VK_PRValue);
177 if (isa<CompoundLiteralExpr>(E)) {
178 break;
179 } else if (ParenExpr *PE = dyn_cast<ParenExpr>(E)) {
180 E = PE->getSubExpr();
181 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
182 assert(UO->getOpcode() == UO_Extension)(static_cast <bool> (UO->getOpcode() == UO_Extension
) ? void (0) : __assert_fail ("UO->getOpcode() == UO_Extension"
, "clang/lib/Sema/SemaInit.cpp", 182, __extension__ __PRETTY_FUNCTION__
))
;
183 E = UO->getSubExpr();
184 } else if (GenericSelectionExpr *GSE = dyn_cast<GenericSelectionExpr>(E)) {
185 E = GSE->getResultExpr();
186 } else if (ChooseExpr *CE = dyn_cast<ChooseExpr>(E)) {
187 E = CE->getChosenSubExpr();
188 } else {
189 llvm_unreachable("unexpected expr in array compound literal init")::llvm::llvm_unreachable_internal("unexpected expr in array compound literal init"
, "clang/lib/Sema/SemaInit.cpp", 189)
;
190 }
191 }
192}
193
194static void CheckStringInit(Expr *Str, QualType &DeclT, const ArrayType *AT,
195 Sema &S) {
196 // Get the length of the string as parsed.
197 auto *ConstantArrayTy =
198 cast<ConstantArrayType>(Str->getType()->getAsArrayTypeUnsafe());
199 uint64_t StrLength = ConstantArrayTy->getSize().getZExtValue();
200
201 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) {
202 // C99 6.7.8p14. We have an array of character type with unknown size
203 // being initialized to a string literal.
204 llvm::APInt ConstVal(32, StrLength);
205 // Return a new array type (C99 6.7.8p22).
206 DeclT = S.Context.getConstantArrayType(IAT->getElementType(),
207 ConstVal, nullptr,
208 ArrayType::Normal, 0);
209 updateStringLiteralType(Str, DeclT);
210 return;
211 }
212
213 const ConstantArrayType *CAT = cast<ConstantArrayType>(AT);
214
215 // We have an array of character type with known size. However,
216 // the size may be smaller or larger than the string we are initializing.
217 // FIXME: Avoid truncation for 64-bit length strings.
218 if (S.getLangOpts().CPlusPlus) {
219 if (StringLiteral *SL = dyn_cast<StringLiteral>(Str->IgnoreParens())) {
220 // For Pascal strings it's OK to strip off the terminating null character,
221 // so the example below is valid:
222 //
223 // unsigned char a[2] = "\pa";
224 if (SL->isPascal())
225 StrLength--;
226 }
227
228 // [dcl.init.string]p2
229 if (StrLength > CAT->getSize().getZExtValue())
230 S.Diag(Str->getBeginLoc(),
231 diag::err_initializer_string_for_char_array_too_long)
232 << Str->getSourceRange();
233 } else {
234 // C99 6.7.8p14.
235 if (StrLength-1 > CAT->getSize().getZExtValue())
236 S.Diag(Str->getBeginLoc(),
237 diag::ext_initializer_string_for_char_array_too_long)
238 << Str->getSourceRange();
239 }
240
241 // Set the type to the actual size that we are initializing. If we have
242 // something like:
243 // char x[1] = "foo";
244 // then this will set the string literal's type to char[1].
245 updateStringLiteralType(Str, DeclT);
246}
247
248//===----------------------------------------------------------------------===//
249// Semantic checking for initializer lists.
250//===----------------------------------------------------------------------===//
251
252namespace {
253
254/// Semantic checking for initializer lists.
255///
256/// The InitListChecker class contains a set of routines that each
257/// handle the initialization of a certain kind of entity, e.g.,
258/// arrays, vectors, struct/union types, scalars, etc. The
259/// InitListChecker itself performs a recursive walk of the subobject
260/// structure of the type to be initialized, while stepping through
261/// the initializer list one element at a time. The IList and Index
262/// parameters to each of the Check* routines contain the active
263/// (syntactic) initializer list and the index into that initializer
264/// list that represents the current initializer. Each routine is
265/// responsible for moving that Index forward as it consumes elements.
266///
267/// Each Check* routine also has a StructuredList/StructuredIndex
268/// arguments, which contains the current "structured" (semantic)
269/// initializer list and the index into that initializer list where we
270/// are copying initializers as we map them over to the semantic
271/// list. Once we have completed our recursive walk of the subobject
272/// structure, we will have constructed a full semantic initializer
273/// list.
274///
275/// C99 designators cause changes in the initializer list traversal,
276/// because they make the initialization "jump" into a specific
277/// subobject and then continue the initialization from that
278/// point. CheckDesignatedInitializer() recursively steps into the
279/// designated subobject and manages backing out the recursion to
280/// initialize the subobjects after the one designated.
281///
282/// If an initializer list contains any designators, we build a placeholder
283/// structured list even in 'verify only' mode, so that we can track which
284/// elements need 'empty' initializtion.
285class InitListChecker {
286 Sema &SemaRef;
287 bool hadError = false;
288 bool VerifyOnly; // No diagnostics.
289 bool TreatUnavailableAsInvalid; // Used only in VerifyOnly mode.
290 bool InOverloadResolution;
291 InitListExpr *FullyStructuredList = nullptr;
292 NoInitExpr *DummyExpr = nullptr;
293
294 NoInitExpr *getDummyInit() {
295 if (!DummyExpr)
296 DummyExpr = new (SemaRef.Context) NoInitExpr(SemaRef.Context.VoidTy);
297 return DummyExpr;
298 }
299
300 void CheckImplicitInitList(const InitializedEntity &Entity,
301 InitListExpr *ParentIList, QualType T,
302 unsigned &Index, InitListExpr *StructuredList,
303 unsigned &StructuredIndex);
304 void CheckExplicitInitList(const InitializedEntity &Entity,
305 InitListExpr *IList, QualType &T,
306 InitListExpr *StructuredList,
307 bool TopLevelObject = false);
308 void CheckListElementTypes(const InitializedEntity &Entity,
309 InitListExpr *IList, QualType &DeclType,
310 bool SubobjectIsDesignatorContext,
311 unsigned &Index,
312 InitListExpr *StructuredList,
313 unsigned &StructuredIndex,
314 bool TopLevelObject = false);
315 void CheckSubElementType(const InitializedEntity &Entity,
316 InitListExpr *IList, QualType ElemType,
317 unsigned &Index,
318 InitListExpr *StructuredList,
319 unsigned &StructuredIndex,
320 bool DirectlyDesignated = false);
321 void CheckComplexType(const InitializedEntity &Entity,
322 InitListExpr *IList, QualType DeclType,
323 unsigned &Index,
324 InitListExpr *StructuredList,
325 unsigned &StructuredIndex);
326 void CheckScalarType(const InitializedEntity &Entity,
327 InitListExpr *IList, QualType DeclType,
328 unsigned &Index,
329 InitListExpr *StructuredList,
330 unsigned &StructuredIndex);
331 void CheckReferenceType(const InitializedEntity &Entity,
332 InitListExpr *IList, QualType DeclType,
333 unsigned &Index,
334 InitListExpr *StructuredList,
335 unsigned &StructuredIndex);
336 void CheckVectorType(const InitializedEntity &Entity,
337 InitListExpr *IList, QualType DeclType, unsigned &Index,
338 InitListExpr *StructuredList,
339 unsigned &StructuredIndex);
340 void CheckStructUnionTypes(const InitializedEntity &Entity,
341 InitListExpr *IList, QualType DeclType,
342 CXXRecordDecl::base_class_range Bases,
343 RecordDecl::field_iterator Field,
344 bool SubobjectIsDesignatorContext, unsigned &Index,
345 InitListExpr *StructuredList,
346 unsigned &StructuredIndex,
347 bool TopLevelObject = false);
348 void CheckArrayType(const InitializedEntity &Entity,
349 InitListExpr *IList, QualType &DeclType,
350 llvm::APSInt elementIndex,
351 bool SubobjectIsDesignatorContext, unsigned &Index,
352 InitListExpr *StructuredList,
353 unsigned &StructuredIndex);
354 bool CheckDesignatedInitializer(const InitializedEntity &Entity,
355 InitListExpr *IList, DesignatedInitExpr *DIE,
356 unsigned DesigIdx,
357 QualType &CurrentObjectType,
358 RecordDecl::field_iterator *NextField,
359 llvm::APSInt *NextElementIndex,
360 unsigned &Index,
361 InitListExpr *StructuredList,
362 unsigned &StructuredIndex,
363 bool FinishSubobjectInit,
364 bool TopLevelObject);
365 InitListExpr *getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
366 QualType CurrentObjectType,
367 InitListExpr *StructuredList,
368 unsigned StructuredIndex,
369 SourceRange InitRange,
370 bool IsFullyOverwritten = false);
371 void UpdateStructuredListElement(InitListExpr *StructuredList,
372 unsigned &StructuredIndex,
373 Expr *expr);
374 InitListExpr *createInitListExpr(QualType CurrentObjectType,
375 SourceRange InitRange,
376 unsigned ExpectedNumInits);
377 int numArrayElements(QualType DeclType);
378 int numStructUnionElements(QualType DeclType);
379
380 ExprResult PerformEmptyInit(SourceLocation Loc,
381 const InitializedEntity &Entity);
382
383 /// Diagnose that OldInit (or part thereof) has been overridden by NewInit.
384 void diagnoseInitOverride(Expr *OldInit, SourceRange NewInitRange,
385 bool FullyOverwritten = true) {
386 // Overriding an initializer via a designator is valid with C99 designated
387 // initializers, but ill-formed with C++20 designated initializers.
388 unsigned DiagID = SemaRef.getLangOpts().CPlusPlus
389 ? diag::ext_initializer_overrides
390 : diag::warn_initializer_overrides;
391
392 if (InOverloadResolution && SemaRef.getLangOpts().CPlusPlus) {
393 // In overload resolution, we have to strictly enforce the rules, and so
394 // don't allow any overriding of prior initializers. This matters for a
395 // case such as:
396 //
397 // union U { int a, b; };
398 // struct S { int a, b; };
399 // void f(U), f(S);
400 //
401 // Here, f({.a = 1, .b = 2}) is required to call the struct overload. For
402 // consistency, we disallow all overriding of prior initializers in
403 // overload resolution, not only overriding of union members.
404 hadError = true;
405 } else if (OldInit->getType().isDestructedType() && !FullyOverwritten) {
406 // If we'll be keeping around the old initializer but overwriting part of
407 // the object it initialized, and that object is not trivially
408 // destructible, this can leak. Don't allow that, not even as an
409 // extension.
410 //
411 // FIXME: It might be reasonable to allow this in cases where the part of
412 // the initializer that we're overriding has trivial destruction.
413 DiagID = diag::err_initializer_overrides_destructed;
414 } else if (!OldInit->getSourceRange().isValid()) {
415 // We need to check on source range validity because the previous
416 // initializer does not have to be an explicit initializer. e.g.,
417 //
418 // struct P { int a, b; };
419 // struct PP { struct P p } l = { { .a = 2 }, .p.b = 3 };
420 //
421 // There is an overwrite taking place because the first braced initializer
422 // list "{ .a = 2 }" already provides value for .p.b (which is zero).
423 //
424 // Such overwrites are harmless, so we don't diagnose them. (Note that in
425 // C++, this cannot be reached unless we've already seen and diagnosed a
426 // different conformance issue, such as a mixture of designated and
427 // non-designated initializers or a multi-level designator.)
428 return;
429 }
430
431 if (!VerifyOnly) {
432 SemaRef.Diag(NewInitRange.getBegin(), DiagID)
433 << NewInitRange << FullyOverwritten << OldInit->getType();
434 SemaRef.Diag(OldInit->getBeginLoc(), diag::note_previous_initializer)
435 << (OldInit->HasSideEffects(SemaRef.Context) && FullyOverwritten)
436 << OldInit->getSourceRange();
437 }
438 }
439
440 // Explanation on the "FillWithNoInit" mode:
441 //
442 // Assume we have the following definitions (Case#1):
443 // struct P { char x[6][6]; } xp = { .x[1] = "bar" };
444 // struct PP { struct P lp; } l = { .lp = xp, .lp.x[1][2] = 'f' };
445 //
446 // l.lp.x[1][0..1] should not be filled with implicit initializers because the
447 // "base" initializer "xp" will provide values for them; l.lp.x[1] will be "baf".
448 //
449 // But if we have (Case#2):
450 // struct PP l = { .lp = xp, .lp.x[1] = { [2] = 'f' } };
451 //
452 // l.lp.x[1][0..1] are implicitly initialized and do not use values from the
453 // "base" initializer; l.lp.x[1] will be "\0\0f\0\0\0".
454 //
455 // To distinguish Case#1 from Case#2, and also to avoid leaving many "holes"
456 // in the InitListExpr, the "holes" in Case#1 are filled not with empty
457 // initializers but with special "NoInitExpr" place holders, which tells the
458 // CodeGen not to generate any initializers for these parts.
459 void FillInEmptyInitForBase(unsigned Init, const CXXBaseSpecifier &Base,
460 const InitializedEntity &ParentEntity,
461 InitListExpr *ILE, bool &RequiresSecondPass,
462 bool FillWithNoInit);
463 void FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
464 const InitializedEntity &ParentEntity,
465 InitListExpr *ILE, bool &RequiresSecondPass,
466 bool FillWithNoInit = false);
467 void FillInEmptyInitializations(const InitializedEntity &Entity,
468 InitListExpr *ILE, bool &RequiresSecondPass,
469 InitListExpr *OuterILE, unsigned OuterIndex,
470 bool FillWithNoInit = false);
471 bool CheckFlexibleArrayInit(const InitializedEntity &Entity,
472 Expr *InitExpr, FieldDecl *Field,
473 bool TopLevelObject);
474 void CheckEmptyInitializable(const InitializedEntity &Entity,
475 SourceLocation Loc);
476
477public:
478 InitListChecker(Sema &S, const InitializedEntity &Entity, InitListExpr *IL,
479 QualType &T, bool VerifyOnly, bool TreatUnavailableAsInvalid,
480 bool InOverloadResolution = false);
481 bool HadError() { return hadError; }
482
483 // Retrieves the fully-structured initializer list used for
484 // semantic analysis and code generation.
485 InitListExpr *getFullyStructuredList() const { return FullyStructuredList; }
486};
487
488} // end anonymous namespace
489
490ExprResult InitListChecker::PerformEmptyInit(SourceLocation Loc,
491 const InitializedEntity &Entity) {
492 InitializationKind Kind = InitializationKind::CreateValue(Loc, Loc, Loc,
493 true);
494 MultiExprArg SubInit;
495 Expr *InitExpr;
496 InitListExpr DummyInitList(SemaRef.Context, Loc, None, Loc);
497
498 // C++ [dcl.init.aggr]p7:
499 // If there are fewer initializer-clauses in the list than there are
500 // members in the aggregate, then each member not explicitly initialized
501 // ...
502 bool EmptyInitList = SemaRef.getLangOpts().CPlusPlus11 &&
503 Entity.getType()->getBaseElementTypeUnsafe()->isRecordType();
504 if (EmptyInitList) {
505 // C++1y / DR1070:
506 // shall be initialized [...] from an empty initializer list.
507 //
508 // We apply the resolution of this DR to C++11 but not C++98, since C++98
509 // does not have useful semantics for initialization from an init list.
510 // We treat this as copy-initialization, because aggregate initialization
511 // always performs copy-initialization on its elements.
512 //
513 // Only do this if we're initializing a class type, to avoid filling in
514 // the initializer list where possible.
515 InitExpr = VerifyOnly ? &DummyInitList : new (SemaRef.Context)
516 InitListExpr(SemaRef.Context, Loc, None, Loc);
517 InitExpr->setType(SemaRef.Context.VoidTy);
518 SubInit = InitExpr;
519 Kind = InitializationKind::CreateCopy(Loc, Loc);
520 } else {
521 // C++03:
522 // shall be value-initialized.
523 }
524
525 InitializationSequence InitSeq(SemaRef, Entity, Kind, SubInit);
526 // libstdc++4.6 marks the vector default constructor as explicit in
527 // _GLIBCXX_DEBUG mode, so recover using the C++03 logic in that case.
528 // stlport does so too. Look for std::__debug for libstdc++, and for
529 // std:: for stlport. This is effectively a compiler-side implementation of
530 // LWG2193.
531 if (!InitSeq && EmptyInitList && InitSeq.getFailureKind() ==
532 InitializationSequence::FK_ExplicitConstructor) {
533 OverloadCandidateSet::iterator Best;
534 OverloadingResult O =
535 InitSeq.getFailedCandidateSet()
536 .BestViableFunction(SemaRef, Kind.getLocation(), Best);
537 (void)O;
538 assert(O == OR_Success && "Inconsistent overload resolution")(static_cast <bool> (O == OR_Success && "Inconsistent overload resolution"
) ? void (0) : __assert_fail ("O == OR_Success && \"Inconsistent overload resolution\""
, "clang/lib/Sema/SemaInit.cpp", 538, __extension__ __PRETTY_FUNCTION__
))
;
539 CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
540 CXXRecordDecl *R = CtorDecl->getParent();
541
542 if (CtorDecl->getMinRequiredArguments() == 0 &&
543 CtorDecl->isExplicit() && R->getDeclName() &&
544 SemaRef.SourceMgr.isInSystemHeader(CtorDecl->getLocation())) {
545 bool IsInStd = false;
546 for (NamespaceDecl *ND = dyn_cast<NamespaceDecl>(R->getDeclContext());
547 ND && !IsInStd; ND = dyn_cast<NamespaceDecl>(ND->getParent())) {
548 if (SemaRef.getStdNamespace()->InEnclosingNamespaceSetOf(ND))
549 IsInStd = true;
550 }
551
552 if (IsInStd && llvm::StringSwitch<bool>(R->getName())
553 .Cases("basic_string", "deque", "forward_list", true)
554 .Cases("list", "map", "multimap", "multiset", true)
555 .Cases("priority_queue", "queue", "set", "stack", true)
556 .Cases("unordered_map", "unordered_set", "vector", true)
557 .Default(false)) {
558 InitSeq.InitializeFrom(
559 SemaRef, Entity,
560 InitializationKind::CreateValue(Loc, Loc, Loc, true),
561 MultiExprArg(), /*TopLevelOfInitList=*/false,
562 TreatUnavailableAsInvalid);
563 // Emit a warning for this. System header warnings aren't shown
564 // by default, but people working on system headers should see it.
565 if (!VerifyOnly) {
566 SemaRef.Diag(CtorDecl->getLocation(),
567 diag::warn_invalid_initializer_from_system_header);
568 if (Entity.getKind() == InitializedEntity::EK_Member)
569 SemaRef.Diag(Entity.getDecl()->getLocation(),
570 diag::note_used_in_initialization_here);
571 else if (Entity.getKind() == InitializedEntity::EK_ArrayElement)
572 SemaRef.Diag(Loc, diag::note_used_in_initialization_here);
573 }
574 }
575 }
576 }
577 if (!InitSeq) {
578 if (!VerifyOnly) {
579 InitSeq.Diagnose(SemaRef, Entity, Kind, SubInit);
580 if (Entity.getKind() == InitializedEntity::EK_Member)
581 SemaRef.Diag(Entity.getDecl()->getLocation(),
582 diag::note_in_omitted_aggregate_initializer)
583 << /*field*/1 << Entity.getDecl();
584 else if (Entity.getKind() == InitializedEntity::EK_ArrayElement) {
585 bool IsTrailingArrayNewMember =
586 Entity.getParent() &&
587 Entity.getParent()->isVariableLengthArrayNew();
588 SemaRef.Diag(Loc, diag::note_in_omitted_aggregate_initializer)
589 << (IsTrailingArrayNewMember ? 2 : /*array element*/0)
590 << Entity.getElementIndex();
591 }
592 }
593 hadError = true;
594 return ExprError();
595 }
596
597 return VerifyOnly ? ExprResult()
598 : InitSeq.Perform(SemaRef, Entity, Kind, SubInit);
599}
600
601void InitListChecker::CheckEmptyInitializable(const InitializedEntity &Entity,
602 SourceLocation Loc) {
603 // If we're building a fully-structured list, we'll check this at the end
604 // once we know which elements are actually initialized. Otherwise, we know
605 // that there are no designators so we can just check now.
606 if (FullyStructuredList)
607 return;
608 PerformEmptyInit(Loc, Entity);
609}
610
611void InitListChecker::FillInEmptyInitForBase(
612 unsigned Init, const CXXBaseSpecifier &Base,
613 const InitializedEntity &ParentEntity, InitListExpr *ILE,
614 bool &RequiresSecondPass, bool FillWithNoInit) {
615 InitializedEntity BaseEntity = InitializedEntity::InitializeBase(
616 SemaRef.Context, &Base, false, &ParentEntity);
617
618 if (Init >= ILE->getNumInits() || !ILE->getInit(Init)) {
619 ExprResult BaseInit = FillWithNoInit
620 ? new (SemaRef.Context) NoInitExpr(Base.getType())
621 : PerformEmptyInit(ILE->getEndLoc(), BaseEntity);
622 if (BaseInit.isInvalid()) {
623 hadError = true;
624 return;
625 }
626
627 if (!VerifyOnly) {
628 assert(Init < ILE->getNumInits() && "should have been expanded")(static_cast <bool> (Init < ILE->getNumInits() &&
"should have been expanded") ? void (0) : __assert_fail ("Init < ILE->getNumInits() && \"should have been expanded\""
, "clang/lib/Sema/SemaInit.cpp", 628, __extension__ __PRETTY_FUNCTION__
))
;
629 ILE->setInit(Init, BaseInit.getAs<Expr>());
630 }
631 } else if (InitListExpr *InnerILE =
632 dyn_cast<InitListExpr>(ILE->getInit(Init))) {
633 FillInEmptyInitializations(BaseEntity, InnerILE, RequiresSecondPass,
634 ILE, Init, FillWithNoInit);
635 } else if (DesignatedInitUpdateExpr *InnerDIUE =
636 dyn_cast<DesignatedInitUpdateExpr>(ILE->getInit(Init))) {
637 FillInEmptyInitializations(BaseEntity, InnerDIUE->getUpdater(),
638 RequiresSecondPass, ILE, Init,
639 /*FillWithNoInit =*/true);
640 }
641}
642
643void InitListChecker::FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
644 const InitializedEntity &ParentEntity,
645 InitListExpr *ILE,
646 bool &RequiresSecondPass,
647 bool FillWithNoInit) {
648 SourceLocation Loc = ILE->getEndLoc();
649 unsigned NumInits = ILE->getNumInits();
650 InitializedEntity MemberEntity
651 = InitializedEntity::InitializeMember(Field, &ParentEntity);
652
653 if (Init >= NumInits || !ILE->getInit(Init)) {
654 if (const RecordType *RType = ILE->getType()->getAs<RecordType>())
655 if (!RType->getDecl()->isUnion())
656 assert((Init < NumInits || VerifyOnly) &&(static_cast <bool> ((Init < NumInits || VerifyOnly)
&& "This ILE should have been expanded") ? void (0) :
__assert_fail ("(Init < NumInits || VerifyOnly) && \"This ILE should have been expanded\""
, "clang/lib/Sema/SemaInit.cpp", 657, __extension__ __PRETTY_FUNCTION__
))
657 "This ILE should have been expanded")(static_cast <bool> ((Init < NumInits || VerifyOnly)
&& "This ILE should have been expanded") ? void (0) :
__assert_fail ("(Init < NumInits || VerifyOnly) && \"This ILE should have been expanded\""
, "clang/lib/Sema/SemaInit.cpp", 657, __extension__ __PRETTY_FUNCTION__
))
;
658
659 if (FillWithNoInit) {
660 assert(!VerifyOnly && "should not fill with no-init in verify-only mode")(static_cast <bool> (!VerifyOnly && "should not fill with no-init in verify-only mode"
) ? void (0) : __assert_fail ("!VerifyOnly && \"should not fill with no-init in verify-only mode\""
, "clang/lib/Sema/SemaInit.cpp", 660, __extension__ __PRETTY_FUNCTION__
))
;
661 Expr *Filler = new (SemaRef.Context) NoInitExpr(Field->getType());
662 if (Init < NumInits)
663 ILE->setInit(Init, Filler);
664 else
665 ILE->updateInit(SemaRef.Context, Init, Filler);
666 return;
667 }
668 // C++1y [dcl.init.aggr]p7:
669 // If there are fewer initializer-clauses in the list than there are
670 // members in the aggregate, then each member not explicitly initialized
671 // shall be initialized from its brace-or-equal-initializer [...]
672 if (Field->hasInClassInitializer()) {
673 if (VerifyOnly)
674 return;
675
676 ExprResult DIE = SemaRef.BuildCXXDefaultInitExpr(Loc, Field);
677 if (DIE.isInvalid()) {
678 hadError = true;
679 return;
680 }
681 SemaRef.checkInitializerLifetime(MemberEntity, DIE.get());
682 if (Init < NumInits)
683 ILE->setInit(Init, DIE.get());
684 else {
685 ILE->updateInit(SemaRef.Context, Init, DIE.get());
686 RequiresSecondPass = true;
687 }
688 return;
689 }
690
691 if (Field->getType()->isReferenceType()) {
692 if (!VerifyOnly) {
693 // C++ [dcl.init.aggr]p9:
694 // If an incomplete or empty initializer-list leaves a
695 // member of reference type uninitialized, the program is
696 // ill-formed.
697 SemaRef.Diag(Loc, diag::err_init_reference_member_uninitialized)
698 << Field->getType()
699 << ILE->getSyntacticForm()->getSourceRange();
700 SemaRef.Diag(Field->getLocation(),
701 diag::note_uninit_reference_member);
702 }
703 hadError = true;
704 return;
705 }
706
707 ExprResult MemberInit = PerformEmptyInit(Loc, MemberEntity);
708 if (MemberInit.isInvalid()) {
709 hadError = true;
710 return;
711 }
712
713 if (hadError || VerifyOnly) {
714 // Do nothing
715 } else if (Init < NumInits) {
716 ILE->setInit(Init, MemberInit.getAs<Expr>());
717 } else if (!isa<ImplicitValueInitExpr>(MemberInit.get())) {
718 // Empty initialization requires a constructor call, so
719 // extend the initializer list to include the constructor
720 // call and make a note that we'll need to take another pass
721 // through the initializer list.
722 ILE->updateInit(SemaRef.Context, Init, MemberInit.getAs<Expr>());
723 RequiresSecondPass = true;
724 }
725 } else if (InitListExpr *InnerILE
726 = dyn_cast<InitListExpr>(ILE->getInit(Init))) {
727 FillInEmptyInitializations(MemberEntity, InnerILE,
728 RequiresSecondPass, ILE, Init, FillWithNoInit);
729 } else if (DesignatedInitUpdateExpr *InnerDIUE =
730 dyn_cast<DesignatedInitUpdateExpr>(ILE->getInit(Init))) {
731 FillInEmptyInitializations(MemberEntity, InnerDIUE->getUpdater(),
732 RequiresSecondPass, ILE, Init,
733 /*FillWithNoInit =*/true);
734 }
735}
736
737/// Recursively replaces NULL values within the given initializer list
738/// with expressions that perform value-initialization of the
739/// appropriate type, and finish off the InitListExpr formation.
740void
741InitListChecker::FillInEmptyInitializations(const InitializedEntity &Entity,
742 InitListExpr *ILE,
743 bool &RequiresSecondPass,
744 InitListExpr *OuterILE,
745 unsigned OuterIndex,
746 bool FillWithNoInit) {
747 assert((ILE->getType() != SemaRef.Context.VoidTy) &&(static_cast <bool> ((ILE->getType() != SemaRef.Context
.VoidTy) && "Should not have void type") ? void (0) :
__assert_fail ("(ILE->getType() != SemaRef.Context.VoidTy) && \"Should not have void type\""
, "clang/lib/Sema/SemaInit.cpp", 748, __extension__ __PRETTY_FUNCTION__
))
748 "Should not have void type")(static_cast <bool> ((ILE->getType() != SemaRef.Context
.VoidTy) && "Should not have void type") ? void (0) :
__assert_fail ("(ILE->getType() != SemaRef.Context.VoidTy) && \"Should not have void type\""
, "clang/lib/Sema/SemaInit.cpp", 748, __extension__ __PRETTY_FUNCTION__
))
;
749
750 // We don't need to do any checks when just filling NoInitExprs; that can't
751 // fail.
752 if (FillWithNoInit && VerifyOnly)
753 return;
754
755 // If this is a nested initializer list, we might have changed its contents
756 // (and therefore some of its properties, such as instantiation-dependence)
757 // while filling it in. Inform the outer initializer list so that its state
758 // can be updated to match.
759 // FIXME: We should fully build the inner initializers before constructing
760 // the outer InitListExpr instead of mutating AST nodes after they have
761 // been used as subexpressions of other nodes.
762 struct UpdateOuterILEWithUpdatedInit {
763 InitListExpr *Outer;
764 unsigned OuterIndex;
765 ~UpdateOuterILEWithUpdatedInit() {
766 if (Outer)
767 Outer->setInit(OuterIndex, Outer->getInit(OuterIndex));
768 }
769 } UpdateOuterRAII = {OuterILE, OuterIndex};
770
771 // A transparent ILE is not performing aggregate initialization and should
772 // not be filled in.
773 if (ILE->isTransparent())
774 return;
775
776 if (const RecordType *RType = ILE->getType()->getAs<RecordType>()) {
777 const RecordDecl *RDecl = RType->getDecl();
778 if (RDecl->isUnion() && ILE->getInitializedFieldInUnion())
779 FillInEmptyInitForField(0, ILE->getInitializedFieldInUnion(),
780 Entity, ILE, RequiresSecondPass, FillWithNoInit);
781 else if (RDecl->isUnion() && isa<CXXRecordDecl>(RDecl) &&
782 cast<CXXRecordDecl>(RDecl)->hasInClassInitializer()) {
783 for (auto *Field : RDecl->fields()) {
784 if (Field->hasInClassInitializer()) {
785 FillInEmptyInitForField(0, Field, Entity, ILE, RequiresSecondPass,
786 FillWithNoInit);
787 break;
788 }
789 }
790 } else {
791 // The fields beyond ILE->getNumInits() are default initialized, so in
792 // order to leave them uninitialized, the ILE is expanded and the extra
793 // fields are then filled with NoInitExpr.
794 unsigned NumElems = numStructUnionElements(ILE->getType());
795 if (RDecl->hasFlexibleArrayMember())
796 ++NumElems;
797 if (!VerifyOnly && ILE->getNumInits() < NumElems)
798 ILE->resizeInits(SemaRef.Context, NumElems);
799
800 unsigned Init = 0;
801
802 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RDecl)) {
803 for (auto &Base : CXXRD->bases()) {
804 if (hadError)
805 return;
806
807 FillInEmptyInitForBase(Init, Base, Entity, ILE, RequiresSecondPass,
808 FillWithNoInit);
809 ++Init;
810 }
811 }
812
813 for (auto *Field : RDecl->fields()) {
814 if (Field->isUnnamedBitfield())
815 continue;
816
817 if (hadError)
818 return;
819
820 FillInEmptyInitForField(Init, Field, Entity, ILE, RequiresSecondPass,
821 FillWithNoInit);
822 if (hadError)
823 return;
824
825 ++Init;
826
827 // Only look at the first initialization of a union.
828 if (RDecl->isUnion())
829 break;
830 }
831 }
832
833 return;
834 }
835
836 QualType ElementType;
837
838 InitializedEntity ElementEntity = Entity;
839 unsigned NumInits = ILE->getNumInits();
840 unsigned NumElements = NumInits;
841 if (const ArrayType *AType = SemaRef.Context.getAsArrayType(ILE->getType())) {
842 ElementType = AType->getElementType();
843 if (const auto *CAType = dyn_cast<ConstantArrayType>(AType))
844 NumElements = CAType->getSize().getZExtValue();
845 // For an array new with an unknown bound, ask for one additional element
846 // in order to populate the array filler.
847 if (Entity.isVariableLengthArrayNew())
848 ++NumElements;
849 ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context,
850 0, Entity);
851 } else if (const VectorType *VType = ILE->getType()->getAs<VectorType>()) {
852 ElementType = VType->getElementType();
853 NumElements = VType->getNumElements();
854 ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context,
855 0, Entity);
856 } else
857 ElementType = ILE->getType();
858
859 bool SkipEmptyInitChecks = false;
860 for (unsigned Init = 0; Init != NumElements; ++Init) {
861 if (hadError)
862 return;
863
864 if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement ||
865 ElementEntity.getKind() == InitializedEntity::EK_VectorElement)
866 ElementEntity.setElementIndex(Init);
867
868 if (Init >= NumInits && (ILE->hasArrayFiller() || SkipEmptyInitChecks))
869 return;
870
871 Expr *InitExpr = (Init < NumInits ? ILE->getInit(Init) : nullptr);
872 if (!InitExpr && Init < NumInits && ILE->hasArrayFiller())
873 ILE->setInit(Init, ILE->getArrayFiller());
874 else if (!InitExpr && !ILE->hasArrayFiller()) {
875 // In VerifyOnly mode, there's no point performing empty initialization
876 // more than once.
877 if (SkipEmptyInitChecks)
878 continue;
879
880 Expr *Filler = nullptr;
881
882 if (FillWithNoInit)
883 Filler = new (SemaRef.Context) NoInitExpr(ElementType);
884 else {
885 ExprResult ElementInit =
886 PerformEmptyInit(ILE->getEndLoc(), ElementEntity);
887 if (ElementInit.isInvalid()) {
888 hadError = true;
889 return;
890 }
891
892 Filler = ElementInit.getAs<Expr>();
893 }
894
895 if (hadError) {
896 // Do nothing
897 } else if (VerifyOnly) {
898 SkipEmptyInitChecks = true;
899 } else if (Init < NumInits) {
900 // For arrays, just set the expression used for value-initialization
901 // of the "holes" in the array.
902 if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement)
903 ILE->setArrayFiller(Filler);
904 else
905 ILE->setInit(Init, Filler);
906 } else {
907 // For arrays, just set the expression used for value-initialization
908 // of the rest of elements and exit.
909 if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement) {
910 ILE->setArrayFiller(Filler);
911 return;
912 }
913
914 if (!isa<ImplicitValueInitExpr>(Filler) && !isa<NoInitExpr>(Filler)) {
915 // Empty initialization requires a constructor call, so
916 // extend the initializer list to include the constructor
917 // call and make a note that we'll need to take another pass
918 // through the initializer list.
919 ILE->updateInit(SemaRef.Context, Init, Filler);
920 RequiresSecondPass = true;
921 }
922 }
923 } else if (InitListExpr *InnerILE
924 = dyn_cast_or_null<InitListExpr>(InitExpr)) {
925 FillInEmptyInitializations(ElementEntity, InnerILE, RequiresSecondPass,
926 ILE, Init, FillWithNoInit);
927 } else if (DesignatedInitUpdateExpr *InnerDIUE =
928 dyn_cast_or_null<DesignatedInitUpdateExpr>(InitExpr)) {
929 FillInEmptyInitializations(ElementEntity, InnerDIUE->getUpdater(),
930 RequiresSecondPass, ILE, Init,
931 /*FillWithNoInit =*/true);
932 }
933 }
934}
935
936static bool hasAnyDesignatedInits(const InitListExpr *IL) {
937 for (const Stmt *Init : *IL)
938 if (Init && isa<DesignatedInitExpr>(Init))
939 return true;
940 return false;
941}
942
943InitListChecker::InitListChecker(Sema &S, const InitializedEntity &Entity,
944 InitListExpr *IL, QualType &T, bool VerifyOnly,
945 bool TreatUnavailableAsInvalid,
946 bool InOverloadResolution)
947 : SemaRef(S), VerifyOnly(VerifyOnly),
948 TreatUnavailableAsInvalid(TreatUnavailableAsInvalid),
949 InOverloadResolution(InOverloadResolution) {
950 if (!VerifyOnly || hasAnyDesignatedInits(IL)) {
951 FullyStructuredList =
952 createInitListExpr(T, IL->getSourceRange(), IL->getNumInits());
953
954 // FIXME: Check that IL isn't already the semantic form of some other
955 // InitListExpr. If it is, we'd create a broken AST.
956 if (!VerifyOnly)
957 FullyStructuredList->setSyntacticForm(IL);
958 }
959
960 CheckExplicitInitList(Entity, IL, T, FullyStructuredList,
961 /*TopLevelObject=*/true);
962
963 if (!hadError && FullyStructuredList) {
964 bool RequiresSecondPass = false;
965 FillInEmptyInitializations(Entity, FullyStructuredList, RequiresSecondPass,
966 /*OuterILE=*/nullptr, /*OuterIndex=*/0);
967 if (RequiresSecondPass && !hadError)
968 FillInEmptyInitializations(Entity, FullyStructuredList,
969 RequiresSecondPass, nullptr, 0);
970 }
971 if (hadError && FullyStructuredList)
972 FullyStructuredList->markError();
973}
974
975int InitListChecker::numArrayElements(QualType DeclType) {
976 // FIXME: use a proper constant
977 int maxElements = 0x7FFFFFFF;
978 if (const ConstantArrayType *CAT =
979 SemaRef.Context.getAsConstantArrayType(DeclType)) {
980 maxElements = static_cast<int>(CAT->getSize().getZExtValue());
981 }
982 return maxElements;
983}
984
985int InitListChecker::numStructUnionElements(QualType DeclType) {
986 RecordDecl *structDecl = DeclType->castAs<RecordType>()->getDecl();
987 int InitializableMembers = 0;
988 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(structDecl))
989 InitializableMembers += CXXRD->getNumBases();
990 for (const auto *Field : structDecl->fields())
991 if (!Field->isUnnamedBitfield())
992 ++InitializableMembers;
993
994 if (structDecl->isUnion())
995 return std::min(InitializableMembers, 1);
996 return InitializableMembers - structDecl->hasFlexibleArrayMember();
997}
998
999/// Determine whether Entity is an entity for which it is idiomatic to elide
1000/// the braces in aggregate initialization.
1001static bool isIdiomaticBraceElisionEntity(const InitializedEntity &Entity) {
1002 // Recursive initialization of the one and only field within an aggregate
1003 // class is considered idiomatic. This case arises in particular for
1004 // initialization of std::array, where the C++ standard suggests the idiom of
1005 //
1006 // std::array<T, N> arr = {1, 2, 3};
1007 //
1008 // (where std::array is an aggregate struct containing a single array field.
1009
1010 if (!Entity.getParent())
1011 return false;
1012
1013 // Allows elide brace initialization for aggregates with empty base.
1014 if (Entity.getKind() == InitializedEntity::EK_Base) {
1015 auto *ParentRD =
1016 Entity.getParent()->getType()->castAs<RecordType>()->getDecl();
1017 CXXRecordDecl *CXXRD = cast<CXXRecordDecl>(ParentRD);
1018 return CXXRD->getNumBases() == 1 && CXXRD->field_empty();
1019 }
1020
1021 // Allow brace elision if the only subobject is a field.
1022 if (Entity.getKind() == InitializedEntity::EK_Member) {
1023 auto *ParentRD =
1024 Entity.getParent()->getType()->castAs<RecordType>()->getDecl();
1025 if (CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(ParentRD)) {
1026 if (CXXRD->getNumBases()) {
1027 return false;
1028 }
1029 }
1030 auto FieldIt = ParentRD->field_begin();
1031 assert(FieldIt != ParentRD->field_end() &&(static_cast <bool> (FieldIt != ParentRD->field_end(
) && "no fields but have initializer for member?") ? void
(0) : __assert_fail ("FieldIt != ParentRD->field_end() && \"no fields but have initializer for member?\""
, "clang/lib/Sema/SemaInit.cpp", 1032, __extension__ __PRETTY_FUNCTION__
))
1032 "no fields but have initializer for member?")(static_cast <bool> (FieldIt != ParentRD->field_end(
) && "no fields but have initializer for member?") ? void
(0) : __assert_fail ("FieldIt != ParentRD->field_end() && \"no fields but have initializer for member?\""
, "clang/lib/Sema/SemaInit.cpp", 1032, __extension__ __PRETTY_FUNCTION__
))
;
1033 return ++FieldIt == ParentRD->field_end();
1034 }
1035
1036 return false;
1037}
1038
1039/// Check whether the range of the initializer \p ParentIList from element
1040/// \p Index onwards can be used to initialize an object of type \p T. Update
1041/// \p Index to indicate how many elements of the list were consumed.
1042///
1043/// This also fills in \p StructuredList, from element \p StructuredIndex
1044/// onwards, with the fully-braced, desugared form of the initialization.
1045void InitListChecker::CheckImplicitInitList(const InitializedEntity &Entity,
1046 InitListExpr *ParentIList,
1047 QualType T, unsigned &Index,
1048 InitListExpr *StructuredList,
1049 unsigned &StructuredIndex) {
1050 int maxElements = 0;
1051
1052 if (T->isArrayType())
1053 maxElements = numArrayElements(T);
1054 else if (T->isRecordType())
1055 maxElements = numStructUnionElements(T);
1056 else if (T->isVectorType())
1057 maxElements = T->castAs<VectorType>()->getNumElements();
1058 else
1059 llvm_unreachable("CheckImplicitInitList(): Illegal type")::llvm::llvm_unreachable_internal("CheckImplicitInitList(): Illegal type"
, "clang/lib/Sema/SemaInit.cpp", 1059)
;
1060
1061 if (maxElements == 0) {
1062 if (!VerifyOnly)
1063 SemaRef.Diag(ParentIList->getInit(Index)->getBeginLoc(),
1064 diag::err_implicit_empty_initializer);
1065 ++Index;
1066 hadError = true;
1067 return;
1068 }
1069
1070 // Build a structured initializer list corresponding to this subobject.
1071 InitListExpr *StructuredSubobjectInitList = getStructuredSubobjectInit(
1072 ParentIList, Index, T, StructuredList, StructuredIndex,
1073 SourceRange(ParentIList->getInit(Index)->getBeginLoc(),
1074 ParentIList->getSourceRange().getEnd()));
1075 unsigned StructuredSubobjectInitIndex = 0;
1076
1077 // Check the element types and build the structural subobject.
1078 unsigned StartIndex = Index;
1079 CheckListElementTypes(Entity, ParentIList, T,
1080 /*SubobjectIsDesignatorContext=*/false, Index,
1081 StructuredSubobjectInitList,
1082 StructuredSubobjectInitIndex);
1083
1084 if (StructuredSubobjectInitList) {
1085 StructuredSubobjectInitList->setType(T);
1086
1087 unsigned EndIndex = (Index == StartIndex? StartIndex : Index - 1);
1088 // Update the structured sub-object initializer so that it's ending
1089 // range corresponds with the end of the last initializer it used.
1090 if (EndIndex < ParentIList->getNumInits() &&
1091 ParentIList->getInit(EndIndex)) {
1092 SourceLocation EndLoc
1093 = ParentIList->getInit(EndIndex)->getSourceRange().getEnd();
1094 StructuredSubobjectInitList->setRBraceLoc(EndLoc);
1095 }
1096
1097 // Complain about missing braces.
1098 if (!VerifyOnly && (T->isArrayType() || T->isRecordType()) &&
1099 !ParentIList->isIdiomaticZeroInitializer(SemaRef.getLangOpts()) &&
1100 !isIdiomaticBraceElisionEntity(Entity)) {
1101 SemaRef.Diag(StructuredSubobjectInitList->getBeginLoc(),
1102 diag::warn_missing_braces)
1103 << StructuredSubobjectInitList->getSourceRange()
1104 << FixItHint::CreateInsertion(
1105 StructuredSubobjectInitList->getBeginLoc(), "{")
1106 << FixItHint::CreateInsertion(
1107 SemaRef.getLocForEndOfToken(
1108 StructuredSubobjectInitList->getEndLoc()),
1109 "}");
1110 }
1111
1112 // Warn if this type won't be an aggregate in future versions of C++.
1113 auto *CXXRD = T->getAsCXXRecordDecl();
1114 if (!VerifyOnly && CXXRD && CXXRD->hasUserDeclaredConstructor()) {
1115 SemaRef.Diag(StructuredSubobjectInitList->getBeginLoc(),
1116 diag::warn_cxx20_compat_aggregate_init_with_ctors)
1117 << StructuredSubobjectInitList->getSourceRange() << T;
1118 }
1119 }
1120}
1121
1122/// Warn that \p Entity was of scalar type and was initialized by a
1123/// single-element braced initializer list.
1124static void warnBracedScalarInit(Sema &S, const InitializedEntity &Entity,
1125 SourceRange Braces) {
1126 // Don't warn during template instantiation. If the initialization was
1127 // non-dependent, we warned during the initial parse; otherwise, the
1128 // type might not be scalar in some uses of the template.
1129 if (S.inTemplateInstantiation())
1130 return;
1131
1132 unsigned DiagID = 0;
1133
1134 switch (Entity.getKind()) {
1135 case InitializedEntity::EK_VectorElement:
1136 case InitializedEntity::EK_ComplexElement:
1137 case InitializedEntity::EK_ArrayElement:
1138 case InitializedEntity::EK_Parameter:
1139 case InitializedEntity::EK_Parameter_CF_Audited:
1140 case InitializedEntity::EK_TemplateParameter:
1141 case InitializedEntity::EK_Result:
1142 // Extra braces here are suspicious.
1143 DiagID = diag::warn_braces_around_init;
1144 break;
1145
1146 case InitializedEntity::EK_Member:
1147 // Warn on aggregate initialization but not on ctor init list or
1148 // default member initializer.
1149 if (Entity.getParent())
1150 DiagID = diag::warn_braces_around_init;
1151 break;
1152
1153 case InitializedEntity::EK_Variable:
1154 case InitializedEntity::EK_LambdaCapture:
1155 // No warning, might be direct-list-initialization.
1156 // FIXME: Should we warn for copy-list-initialization in these cases?
1157 break;
1158
1159 case InitializedEntity::EK_New:
1160 case InitializedEntity::EK_Temporary:
1161 case InitializedEntity::EK_CompoundLiteralInit:
1162 // No warning, braces are part of the syntax of the underlying construct.
1163 break;
1164
1165 case InitializedEntity::EK_RelatedResult:
1166 // No warning, we already warned when initializing the result.
1167 break;
1168
1169 case InitializedEntity::EK_Exception:
1170 case InitializedEntity::EK_Base:
1171 case InitializedEntity::EK_Delegating:
1172 case InitializedEntity::EK_BlockElement:
1173 case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
1174 case InitializedEntity::EK_Binding:
1175 case InitializedEntity::EK_StmtExprResult:
1176 llvm_unreachable("unexpected braced scalar init")::llvm::llvm_unreachable_internal("unexpected braced scalar init"
, "clang/lib/Sema/SemaInit.cpp", 1176)
;
1177 }
1178
1179 if (DiagID) {
1180 S.Diag(Braces.getBegin(), DiagID)
1181 << Entity.getType()->isSizelessBuiltinType() << Braces
1182 << FixItHint::CreateRemoval(Braces.getBegin())
1183 << FixItHint::CreateRemoval(Braces.getEnd());
1184 }
1185}
1186
1187/// Check whether the initializer \p IList (that was written with explicit
1188/// braces) can be used to initialize an object of type \p T.
1189///
1190/// This also fills in \p StructuredList with the fully-braced, desugared
1191/// form of the initialization.
1192void InitListChecker::CheckExplicitInitList(const InitializedEntity &Entity,
1193 InitListExpr *IList, QualType &T,
1194 InitListExpr *StructuredList,
1195 bool TopLevelObject) {
1196 unsigned Index = 0, StructuredIndex = 0;
1197 CheckListElementTypes(Entity, IList, T, /*SubobjectIsDesignatorContext=*/true,
1198 Index, StructuredList, StructuredIndex, TopLevelObject);
1199 if (StructuredList) {
1200 QualType ExprTy = T;
1201 if (!ExprTy->isArrayType())
1202 ExprTy = ExprTy.getNonLValueExprType(SemaRef.Context);
1203 if (!VerifyOnly)
1204 IList->setType(ExprTy);
1205 StructuredList->setType(ExprTy);
1206 }
1207 if (hadError)
1208 return;
1209
1210 // Don't complain for incomplete types, since we'll get an error elsewhere.
1211 if (Index < IList->getNumInits() && !T->isIncompleteType()) {
1212 // We have leftover initializers
1213 bool ExtraInitsIsError = SemaRef.getLangOpts().CPlusPlus ||
1214 (SemaRef.getLangOpts().OpenCL && T->isVectorType());
1215 hadError = ExtraInitsIsError;
1216 if (VerifyOnly) {
1217 return;
1218 } else if (StructuredIndex == 1 &&
1219 IsStringInit(StructuredList->getInit(0), T, SemaRef.Context) ==
1220 SIF_None) {
1221 unsigned DK =
1222 ExtraInitsIsError
1223 ? diag::err_excess_initializers_in_char_array_initializer
1224 : diag::ext_excess_initializers_in_char_array_initializer;
1225 SemaRef.Diag(IList->getInit(Index)->getBeginLoc(), DK)
1226 << IList->getInit(Index)->getSourceRange();
1227 } else if (T->isSizelessBuiltinType()) {
1228 unsigned DK = ExtraInitsIsError
1229 ? diag::err_excess_initializers_for_sizeless_type
1230 : diag::ext_excess_initializers_for_sizeless_type;
1231 SemaRef.Diag(IList->getInit(Index)->getBeginLoc(), DK)
1232 << T << IList->getInit(Index)->getSourceRange();
1233 } else {
1234 int initKind = T->isArrayType() ? 0 :
1235 T->isVectorType() ? 1 :
1236 T->isScalarType() ? 2 :
1237 T->isUnionType() ? 3 :
1238 4;
1239
1240 unsigned DK = ExtraInitsIsError ? diag::err_excess_initializers
1241 : diag::ext_excess_initializers;
1242 SemaRef.Diag(IList->getInit(Index)->getBeginLoc(), DK)
1243 << initKind << IList->getInit(Index)->getSourceRange();
1244 }
1245 }
1246
1247 if (!VerifyOnly) {
1248 if (T->isScalarType() && IList->getNumInits() == 1 &&
1249 !isa<InitListExpr>(IList->getInit(0)))
1250 warnBracedScalarInit(SemaRef, Entity, IList->getSourceRange());
1251
1252 // Warn if this is a class type that won't be an aggregate in future
1253 // versions of C++.
1254 auto *CXXRD = T->getAsCXXRecordDecl();
1255 if (CXXRD && CXXRD->hasUserDeclaredConstructor()) {
1256 // Don't warn if there's an equivalent default constructor that would be
1257 // used instead.
1258 bool HasEquivCtor = false;
1259 if (IList->getNumInits() == 0) {
1260 auto *CD = SemaRef.LookupDefaultConstructor(CXXRD);
1261 HasEquivCtor = CD && !CD->isDeleted();
1262 }
1263
1264 if (!HasEquivCtor) {
1265 SemaRef.Diag(IList->getBeginLoc(),
1266 diag::warn_cxx20_compat_aggregate_init_with_ctors)
1267 << IList->getSourceRange() << T;
1268 }
1269 }
1270 }
1271}
1272
1273void InitListChecker::CheckListElementTypes(const InitializedEntity &Entity,
1274 InitListExpr *IList,
1275 QualType &DeclType,
1276 bool SubobjectIsDesignatorContext,
1277 unsigned &Index,
1278 InitListExpr *StructuredList,
1279 unsigned &StructuredIndex,
1280 bool TopLevelObject) {
1281 if (DeclType->isAnyComplexType() && SubobjectIsDesignatorContext) {
1282 // Explicitly braced initializer for complex type can be real+imaginary
1283 // parts.
1284 CheckComplexType(Entity, IList, DeclType, Index,
1285 StructuredList, StructuredIndex);
1286 } else if (DeclType->isScalarType()) {
1287 CheckScalarType(Entity, IList, DeclType, Index,
1288 StructuredList, StructuredIndex);
1289 } else if (DeclType->isVectorType()) {
1290 CheckVectorType(Entity, IList, DeclType, Index,
1291 StructuredList, StructuredIndex);
1292 } else if (DeclType->isRecordType()) {
1293 assert(DeclType->isAggregateType() &&(static_cast <bool> (DeclType->isAggregateType() &&
"non-aggregate records should be handed in CheckSubElementType"
) ? void (0) : __assert_fail ("DeclType->isAggregateType() && \"non-aggregate records should be handed in CheckSubElementType\""
, "clang/lib/Sema/SemaInit.cpp", 1294, __extension__ __PRETTY_FUNCTION__
))
1294 "non-aggregate records should be handed in CheckSubElementType")(static_cast <bool> (DeclType->isAggregateType() &&
"non-aggregate records should be handed in CheckSubElementType"
) ? void (0) : __assert_fail ("DeclType->isAggregateType() && \"non-aggregate records should be handed in CheckSubElementType\""
, "clang/lib/Sema/SemaInit.cpp", 1294, __extension__ __PRETTY_FUNCTION__
))
;
1295 RecordDecl *RD = DeclType->castAs<RecordType>()->getDecl();
1296 auto Bases =
1297 CXXRecordDecl::base_class_range(CXXRecordDecl::base_class_iterator(),
1298 CXXRecordDecl::base_class_iterator());
1299 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD))
1300 Bases = CXXRD->bases();
1301 CheckStructUnionTypes(Entity, IList, DeclType, Bases, RD->field_begin(),
1302 SubobjectIsDesignatorContext, Index, StructuredList,
1303 StructuredIndex, TopLevelObject);
1304 } else if (DeclType->isArrayType()) {
1305 llvm::APSInt Zero(
1306 SemaRef.Context.getTypeSize(SemaRef.Context.getSizeType()),
1307 false);
1308 CheckArrayType(Entity, IList, DeclType, Zero,
1309 SubobjectIsDesignatorContext, Index,
1310 StructuredList, StructuredIndex);
1311 } else if (DeclType->isVoidType() || DeclType->isFunctionType()) {
1312 // This type is invalid, issue a diagnostic.
1313 ++Index;
1314 if (!VerifyOnly)
1315 SemaRef.Diag(IList->getBeginLoc(), diag::err_illegal_initializer_type)
1316 << DeclType;
1317 hadError = true;
1318 } else if (DeclType->isReferenceType()) {
1319 CheckReferenceType(Entity, IList, DeclType, Index,
1320 StructuredList, StructuredIndex);
1321 } else if (DeclType->isObjCObjectType()) {
1322 if (!VerifyOnly)
1323 SemaRef.Diag(IList->getBeginLoc(), diag::err_init_objc_class) << DeclType;
1324 hadError = true;
1325 } else if (DeclType->isOCLIntelSubgroupAVCType() ||
1326 DeclType->isSizelessBuiltinType()) {
1327 // Checks for scalar type are sufficient for these types too.
1328 CheckScalarType(Entity, IList, DeclType, Index, StructuredList,
1329 StructuredIndex);
1330 } else {
1331 if (!VerifyOnly)
1332 SemaRef.Diag(IList->getBeginLoc(), diag::err_illegal_initializer_type)
1333 << DeclType;
1334 hadError = true;
1335 }
1336}
1337
1338void InitListChecker::CheckSubElementType(const InitializedEntity &Entity,
1339 InitListExpr *IList,
1340 QualType ElemType,
1341 unsigned &Index,
1342 InitListExpr *StructuredList,
1343 unsigned &StructuredIndex,
1344 bool DirectlyDesignated) {
1345 Expr *expr = IList->getInit(Index);
1346
1347 if (ElemType->isReferenceType())
1348 return CheckReferenceType(Entity, IList, ElemType, Index,
1349 StructuredList, StructuredIndex);
1350
1351 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) {
1352 if (SubInitList->getNumInits() == 1 &&
1353 IsStringInit(SubInitList->getInit(0), ElemType, SemaRef.Context) ==
1354 SIF_None) {
1355 // FIXME: It would be more faithful and no less correct to include an
1356 // InitListExpr in the semantic form of the initializer list in this case.
1357 expr = SubInitList->getInit(0);
1358 }
1359 // Nested aggregate initialization and C++ initialization are handled later.
1360 } else if (isa<ImplicitValueInitExpr>(expr)) {
1361 // This happens during template instantiation when we see an InitListExpr
1362 // that we've already checked once.
1363 assert(SemaRef.Context.hasSameType(expr->getType(), ElemType) &&(static_cast <bool> (SemaRef.Context.hasSameType(expr->
getType(), ElemType) && "found implicit initialization for the wrong type"
) ? void (0) : __assert_fail ("SemaRef.Context.hasSameType(expr->getType(), ElemType) && \"found implicit initialization for the wrong type\""
, "clang/lib/Sema/SemaInit.cpp", 1364, __extension__ __PRETTY_FUNCTION__
))
1364 "found implicit initialization for the wrong type")(static_cast <bool> (SemaRef.Context.hasSameType(expr->
getType(), ElemType) && "found implicit initialization for the wrong type"
) ? void (0) : __assert_fail ("SemaRef.Context.hasSameType(expr->getType(), ElemType) && \"found implicit initialization for the wrong type\""
, "clang/lib/Sema/SemaInit.cpp", 1364, __extension__ __PRETTY_FUNCTION__
))
;
1365 UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
1366 ++Index;
1367 return;
1368 }
1369
1370 if (SemaRef.getLangOpts().CPlusPlus || isa<InitListExpr>(expr)) {
1371 // C++ [dcl.init.aggr]p2:
1372 // Each member is copy-initialized from the corresponding
1373 // initializer-clause.
1374
1375 // FIXME: Better EqualLoc?
1376 InitializationKind Kind =
1377 InitializationKind::CreateCopy(expr->getBeginLoc(), SourceLocation());
1378
1379 // Vector elements can be initialized from other vectors in which case
1380 // we need initialization entity with a type of a vector (and not a vector
1381 // element!) initializing multiple vector elements.
1382 auto TmpEntity =
1383 (ElemType->isExtVectorType() && !Entity.getType()->isExtVectorType())
1384 ? InitializedEntity::InitializeTemporary(ElemType)
1385 : Entity;
1386
1387 InitializationSequence Seq(SemaRef, TmpEntity, Kind, expr,
1388 /*TopLevelOfInitList*/ true);
1389
1390 // C++14 [dcl.init.aggr]p13:
1391 // If the assignment-expression can initialize a member, the member is
1392 // initialized. Otherwise [...] brace elision is assumed
1393 //
1394 // Brace elision is never performed if the element is not an
1395 // assignment-expression.
1396 if (Seq || isa<InitListExpr>(expr)) {
1397 if (!VerifyOnly) {
1398 ExprResult Result = Seq.Perform(SemaRef, TmpEntity, Kind, expr);
1399 if (Result.isInvalid())
1400 hadError = true;
1401
1402 UpdateStructuredListElement(StructuredList, StructuredIndex,
1403 Result.getAs<Expr>());
1404 } else if (!Seq) {
1405 hadError = true;
1406 } else if (StructuredList) {
1407 UpdateStructuredListElement(StructuredList, StructuredIndex,
1408 getDummyInit());
1409 }
1410 ++Index;
1411 return;
1412 }
1413
1414 // Fall through for subaggregate initialization
1415 } else if (ElemType->isScalarType() || ElemType->isAtomicType()) {
1416 // FIXME: Need to handle atomic aggregate types with implicit init lists.
1417 return CheckScalarType(Entity, IList, ElemType, Index,
1418 StructuredList, StructuredIndex);
1419 } else if (const ArrayType *arrayType =
1420 SemaRef.Context.getAsArrayType(ElemType)) {
1421 // arrayType can be incomplete if we're initializing a flexible
1422 // array member. There's nothing we can do with the completed
1423 // type here, though.
1424
1425 if (IsStringInit(expr, arrayType, SemaRef.Context) == SIF_None) {
1426 // FIXME: Should we do this checking in verify-only mode?
1427 if (!VerifyOnly)
1428 CheckStringInit(expr, ElemType, arrayType, SemaRef);
1429 if (StructuredList)
1430 UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
1431 ++Index;
1432 return;
1433 }
1434
1435 // Fall through for subaggregate initialization.
1436
1437 } else {
1438 assert((ElemType->isRecordType() || ElemType->isVectorType() ||(static_cast <bool> ((ElemType->isRecordType() || ElemType
->isVectorType() || ElemType->isOpenCLSpecificType()) &&
"Unexpected type") ? void (0) : __assert_fail ("(ElemType->isRecordType() || ElemType->isVectorType() || ElemType->isOpenCLSpecificType()) && \"Unexpected type\""
, "clang/lib/Sema/SemaInit.cpp", 1439, __extension__ __PRETTY_FUNCTION__
))
1439 ElemType->isOpenCLSpecificType()) && "Unexpected type")(static_cast <bool> ((ElemType->isRecordType() || ElemType
->isVectorType() || ElemType->isOpenCLSpecificType()) &&
"Unexpected type") ? void (0) : __assert_fail ("(ElemType->isRecordType() || ElemType->isVectorType() || ElemType->isOpenCLSpecificType()) && \"Unexpected type\""
, "clang/lib/Sema/SemaInit.cpp", 1439, __extension__ __PRETTY_FUNCTION__
))
;
1440
1441 // C99 6.7.8p13:
1442 //
1443 // The initializer for a structure or union object that has
1444 // automatic storage duration shall be either an initializer
1445 // list as described below, or a single expression that has
1446 // compatible structure or union type. In the latter case, the
1447 // initial value of the object, including unnamed members, is
1448 // that of the expression.
1449 ExprResult ExprRes = expr;
1450 if (SemaRef.CheckSingleAssignmentConstraints(
1451 ElemType, ExprRes, !VerifyOnly) != Sema::Incompatible) {
1452 if (ExprRes.isInvalid())
1453 hadError = true;
1454 else {
1455 ExprRes = SemaRef.DefaultFunctionArrayLvalueConversion(ExprRes.get());
1456 if (ExprRes.isInvalid())
1457 hadError = true;
1458 }
1459 UpdateStructuredListElement(StructuredList, StructuredIndex,
1460 ExprRes.getAs<Expr>());
1461 ++Index;
1462 return;
1463 }
1464 ExprRes.get();
1465 // Fall through for subaggregate initialization
1466 }
1467
1468 // C++ [dcl.init.aggr]p12:
1469 //
1470 // [...] Otherwise, if the member is itself a non-empty
1471 // subaggregate, brace elision is assumed and the initializer is
1472 // considered for the initialization of the first member of
1473 // the subaggregate.
1474 // OpenCL vector initializer is handled elsewhere.
1475 if ((!SemaRef.getLangOpts().OpenCL && ElemType->isVectorType()) ||
1476 ElemType->isAggregateType()) {
1477 CheckImplicitInitList(Entity, IList, ElemType, Index, StructuredList,
1478 StructuredIndex);
1479 ++StructuredIndex;
1480
1481 // In C++20, brace elision is not permitted for a designated initializer.
1482 if (DirectlyDesignated && SemaRef.getLangOpts().CPlusPlus && !hadError) {
1483 if (InOverloadResolution)
1484 hadError = true;
1485 if (!VerifyOnly) {
1486 SemaRef.Diag(expr->getBeginLoc(),
1487 diag::ext_designated_init_brace_elision)
1488 << expr->getSourceRange()
1489 << FixItHint::CreateInsertion(expr->getBeginLoc(), "{")
1490 << FixItHint::CreateInsertion(
1491 SemaRef.getLocForEndOfToken(expr->getEndLoc()), "}");
1492 }
1493 }
1494 } else {
1495 if (!VerifyOnly) {
1496 // We cannot initialize this element, so let PerformCopyInitialization
1497 // produce the appropriate diagnostic. We already checked that this
1498 // initialization will fail.
1499 ExprResult Copy =
1500 SemaRef.PerformCopyInitialization(Entity, SourceLocation(), expr,
1501 /*TopLevelOfInitList=*/true);
1502 (void)Copy;
1503 assert(Copy.isInvalid() &&(static_cast <bool> (Copy.isInvalid() && "expected non-aggregate initialization to fail"
) ? void (0) : __assert_fail ("Copy.isInvalid() && \"expected non-aggregate initialization to fail\""
, "clang/lib/Sema/SemaInit.cpp", 1504, __extension__ __PRETTY_FUNCTION__
))
1504 "expected non-aggregate initialization to fail")(static_cast <bool> (Copy.isInvalid() && "expected non-aggregate initialization to fail"
) ? void (0) : __assert_fail ("Copy.isInvalid() && \"expected non-aggregate initialization to fail\""
, "clang/lib/Sema/SemaInit.cpp", 1504, __extension__ __PRETTY_FUNCTION__
))
;
1505 }
1506 hadError = true;
1507 ++Index;
1508 ++StructuredIndex;
1509 }
1510}
1511
1512void InitListChecker::CheckComplexType(const InitializedEntity &Entity,
1513 InitListExpr *IList, QualType DeclType,
1514 unsigned &Index,
1515 InitListExpr *StructuredList,
1516 unsigned &StructuredIndex) {
1517 assert(Index == 0 && "Index in explicit init list must be zero")(static_cast <bool> (Index == 0 && "Index in explicit init list must be zero"
) ? void (0) : __assert_fail ("Index == 0 && \"Index in explicit init list must be zero\""
, "clang/lib/Sema/SemaInit.cpp", 1517, __extension__ __PRETTY_FUNCTION__
))
;
1518
1519 // As an extension, clang supports complex initializers, which initialize
1520 // a complex number component-wise. When an explicit initializer list for
1521 // a complex number contains two two initializers, this extension kicks in:
1522 // it exepcts the initializer list to contain two elements convertible to
1523 // the element type of the complex type. The first element initializes
1524 // the real part, and the second element intitializes the imaginary part.
1525
1526 if (IList->getNumInits() != 2)
1527 return CheckScalarType(Entity, IList, DeclType, Index, StructuredList,
1528 StructuredIndex);
1529
1530 // This is an extension in C. (The builtin _Complex type does not exist
1531 // in the C++ standard.)
1532 if (!SemaRef.getLangOpts().CPlusPlus && !VerifyOnly)
1533 SemaRef.Diag(IList->getBeginLoc(), diag::ext_complex_component_init)
1534 << IList->getSourceRange();
1535
1536 // Initialize the complex number.
1537 QualType elementType = DeclType->castAs<ComplexType>()->getElementType();
1538 InitializedEntity ElementEntity =
1539 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
1540
1541 for (unsigned i = 0; i < 2; ++i) {
1542 ElementEntity.setElementIndex(Index);
1543 CheckSubElementType(ElementEntity, IList, elementType, Index,
1544 StructuredList, StructuredIndex);
1545 }
1546}
1547
1548void InitListChecker::CheckScalarType(const InitializedEntity &Entity,
1549 InitListExpr *IList, QualType DeclType,
1550 unsigned &Index,
1551 InitListExpr *StructuredList,
1552 unsigned &StructuredIndex) {
1553 if (Index >= IList->getNumInits()) {
1554 if (!VerifyOnly) {
1555 if (DeclType->isSizelessBuiltinType())
1556 SemaRef.Diag(IList->getBeginLoc(),
1557 SemaRef.getLangOpts().CPlusPlus11
1558 ? diag::warn_cxx98_compat_empty_sizeless_initializer
1559 : diag::err_empty_sizeless_initializer)
1560 << DeclType << IList->getSourceRange();
1561 else
1562 SemaRef.Diag(IList->getBeginLoc(),
1563 SemaRef.getLangOpts().CPlusPlus11
1564 ? diag::warn_cxx98_compat_empty_scalar_initializer
1565 : diag::err_empty_scalar_initializer)
1566 << IList->getSourceRange();
1567 }
1568 hadError = !SemaRef.getLangOpts().CPlusPlus11;
1569 ++Index;
1570 ++StructuredIndex;
1571 return;
1572 }
1573
1574 Expr *expr = IList->getInit(Index);
1575 if (InitListExpr *SubIList = dyn_cast<InitListExpr>(expr)) {
1576 // FIXME: This is invalid, and accepting it causes overload resolution
1577 // to pick the wrong overload in some corner cases.
1578 if (!VerifyOnly)
1579 SemaRef.Diag(SubIList->getBeginLoc(), diag::ext_many_braces_around_init)
1580 << DeclType->isSizelessBuiltinType() << SubIList->getSourceRange();
1581
1582 CheckScalarType(Entity, SubIList, DeclType, Index, StructuredList,
1583 StructuredIndex);
1584 return;
1585 } else if (isa<DesignatedInitExpr>(expr)) {
1586 if (!VerifyOnly)
1587 SemaRef.Diag(expr->getBeginLoc(),
1588 diag::err_designator_for_scalar_or_sizeless_init)
1589 << DeclType->isSizelessBuiltinType() << DeclType
1590 << expr->getSourceRange();
1591 hadError = true;
1592 ++Index;
1593 ++StructuredIndex;
1594 return;
1595 }
1596
1597 ExprResult Result;
1598 if (VerifyOnly) {
1599 if (SemaRef.CanPerformCopyInitialization(Entity, expr))
1600 Result = getDummyInit();
1601 else
1602 Result = ExprError();
1603 } else {
1604 Result =
1605 SemaRef.PerformCopyInitialization(Entity, expr->getBeginLoc(), expr,
1606 /*TopLevelOfInitList=*/true);
1607 }
1608
1609 Expr *ResultExpr = nullptr;
1610
1611 if (Result.isInvalid())
1612 hadError = true; // types weren't compatible.
1613 else {
1614 ResultExpr = Result.getAs<Expr>();
1615
1616 if (ResultExpr != expr && !VerifyOnly) {
1617 // The type was promoted, update initializer list.
1618 // FIXME: Why are we updating the syntactic init list?
1619 IList->setInit(Index, ResultExpr);
1620 }
1621 }
1622 UpdateStructuredListElement(StructuredList, StructuredIndex, ResultExpr);
1623 ++Index;
1624}
1625
1626void InitListChecker::CheckReferenceType(const InitializedEntity &Entity,
1627 InitListExpr *IList, QualType DeclType,
1628 unsigned &Index,
1629 InitListExpr *StructuredList,
1630 unsigned &StructuredIndex) {
1631 if (Index >= IList->getNumInits()) {
1632 // FIXME: It would be wonderful if we could point at the actual member. In
1633 // general, it would be useful to pass location information down the stack,
1634 // so that we know the location (or decl) of the "current object" being
1635 // initialized.
1636 if (!VerifyOnly)
1637 SemaRef.Diag(IList->getBeginLoc(),
1638 diag::err_init_reference_member_uninitialized)
1639 << DeclType << IList->getSourceRange();
1640 hadError = true;
1641 ++Index;
1642 ++StructuredIndex;
1643 return;
1644 }
1645
1646 Expr *expr = IList->getInit(Index);
1647 if (isa<InitListExpr>(expr) && !SemaRef.getLangOpts().CPlusPlus11) {
1648 if (!VerifyOnly)
1649 SemaRef.Diag(IList->getBeginLoc(), diag::err_init_non_aggr_init_list)
1650 << DeclType << IList->getSourceRange();
1651 hadError = true;
1652 ++Index;
1653 ++StructuredIndex;
1654 return;
1655 }
1656
1657 ExprResult Result;
1658 if (VerifyOnly) {
1659 if (SemaRef.CanPerformCopyInitialization(Entity,expr))
1660 Result = getDummyInit();
1661 else
1662 Result = ExprError();
1663 } else {
1664 Result =
1665 SemaRef.PerformCopyInitialization(Entity, expr->getBeginLoc(), expr,
1666 /*TopLevelOfInitList=*/true);
1667 }
1668
1669 if (Result.isInvalid())
1670 hadError = true;
1671
1672 expr = Result.getAs<Expr>();
1673 // FIXME: Why are we updating the syntactic init list?
1674 if (!VerifyOnly && expr)
1675 IList->setInit(Index, expr);
1676
1677 UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
1678 ++Index;
1679}
1680
1681void InitListChecker::CheckVectorType(const InitializedEntity &Entity,
1682 InitListExpr *IList, QualType DeclType,
1683 unsigned &Index,
1684 InitListExpr *StructuredList,
1685 unsigned &StructuredIndex) {
1686 const VectorType *VT = DeclType->castAs<VectorType>();
1687 unsigned maxElements = VT->getNumElements();
1688 unsigned numEltsInit = 0;
1689 QualType elementType = VT->getElementType();
1690
1691 if (Index >= IList->getNumInits()) {
1692 // Make sure the element type can be value-initialized.
1693 CheckEmptyInitializable(
1694 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity),
1695 IList->getEndLoc());
1696 return;
1697 }
1698
1699 if (!SemaRef.getLangOpts().OpenCL) {
1700 // If the initializing element is a vector, try to copy-initialize
1701 // instead of breaking it apart (which is doomed to failure anyway).
1702 Expr *Init = IList->getInit(Index);
1703 if (!isa<InitListExpr>(Init) && Init->getType()->isVectorType()) {
1704 ExprResult Result;
1705 if (VerifyOnly) {
1706 if (SemaRef.CanPerformCopyInitialization(Entity, Init))
1707 Result = getDummyInit();
1708 else
1709 Result = ExprError();
1710 } else {
1711 Result =
1712 SemaRef.PerformCopyInitialization(Entity, Init->getBeginLoc(), Init,
1713 /*TopLevelOfInitList=*/true);
1714 }
1715
1716 Expr *ResultExpr = nullptr;
1717 if (Result.isInvalid())
1718 hadError = true; // types weren't compatible.
1719 else {
1720 ResultExpr = Result.getAs<Expr>();
1721
1722 if (ResultExpr != Init && !VerifyOnly) {
1723 // The type was promoted, update initializer list.
1724 // FIXME: Why are we updating the syntactic init list?
1725 IList->setInit(Index, ResultExpr);
1726 }
1727 }
1728 UpdateStructuredListElement(StructuredList, StructuredIndex, ResultExpr);
1729 ++Index;
1730 return;
1731 }
1732
1733 InitializedEntity ElementEntity =
1734 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
1735
1736 for (unsigned i = 0; i < maxElements; ++i, ++numEltsInit) {
1737 // Don't attempt to go past the end of the init list
1738 if (Index >= IList->getNumInits()) {
1739 CheckEmptyInitializable(ElementEntity, IList->getEndLoc());
1740 break;
1741 }
1742
1743 ElementEntity.setElementIndex(Index);
1744 CheckSubElementType(ElementEntity, IList, elementType, Index,
1745 StructuredList, StructuredIndex);
1746 }
1747
1748 if (VerifyOnly)
1749 return;
1750
1751 bool isBigEndian = SemaRef.Context.getTargetInfo().isBigEndian();
1752 const VectorType *T = Entity.getType()->castAs<VectorType>();
1753 if (isBigEndian && (T->getVectorKind() == VectorType::NeonVector ||
1754 T->getVectorKind() == VectorType::NeonPolyVector)) {
1755 // The ability to use vector initializer lists is a GNU vector extension
1756 // and is unrelated to the NEON intrinsics in arm_neon.h. On little
1757 // endian machines it works fine, however on big endian machines it
1758 // exhibits surprising behaviour:
1759 //
1760 // uint32x2_t x = {42, 64};
1761 // return vget_lane_u32(x, 0); // Will return 64.
1762 //
1763 // Because of this, explicitly call out that it is non-portable.
1764 //
1765 SemaRef.Diag(IList->getBeginLoc(),
1766 diag::warn_neon_vector_initializer_non_portable);
1767
1768 const char *typeCode;
1769 unsigned typeSize = SemaRef.Context.getTypeSize(elementType);
1770
1771 if (elementType->isFloatingType())
1772 typeCode = "f";
1773 else if (elementType->isSignedIntegerType())
1774 typeCode = "s";
1775 else if (elementType->isUnsignedIntegerType())
1776 typeCode = "u";
1777 else
1778 llvm_unreachable("Invalid element type!")::llvm::llvm_unreachable_internal("Invalid element type!", "clang/lib/Sema/SemaInit.cpp"
, 1778)
;
1779
1780 SemaRef.Diag(IList->getBeginLoc(),
1781 SemaRef.Context.getTypeSize(VT) > 64
1782 ? diag::note_neon_vector_initializer_non_portable_q
1783 : diag::note_neon_vector_initializer_non_portable)
1784 << typeCode << typeSize;
1785 }
1786
1787 return;
1788 }
1789
1790 InitializedEntity ElementEntity =
1791 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
1792
1793 // OpenCL initializers allows vectors to be constructed from vectors.
1794 for (unsigned i = 0; i < maxElements; ++i) {
1795 // Don't attempt to go past the end of the init list
1796 if (Index >= IList->getNumInits())
1797 break;
1798
1799 ElementEntity.setElementIndex(Index);
1800
1801 QualType IType = IList->getInit(Index)->getType();
1802 if (!IType->isVectorType()) {
1803 CheckSubElementType(ElementEntity, IList, elementType, Index,
1804 StructuredList, StructuredIndex);
1805 ++numEltsInit;
1806 } else {
1807 QualType VecType;
1808 const VectorType *IVT = IType->castAs<VectorType>();
1809 unsigned numIElts = IVT->getNumElements();
1810
1811 if (IType->isExtVectorType())
1812 VecType = SemaRef.Context.getExtVectorType(elementType, numIElts);
1813 else
1814 VecType = SemaRef.Context.getVectorType(elementType, numIElts,
1815 IVT->getVectorKind());
1816 CheckSubElementType(ElementEntity, IList, VecType, Index,
1817 StructuredList, StructuredIndex);
1818 numEltsInit += numIElts;
1819 }
1820 }
1821
1822 // OpenCL requires all elements to be initialized.
1823 if (numEltsInit != maxElements) {
1824 if (!VerifyOnly)
1825 SemaRef.Diag(IList->getBeginLoc(),
1826 diag::err_vector_incorrect_num_initializers)
1827 << (numEltsInit < maxElements) << maxElements << numEltsInit;
1828 hadError = true;
1829 }
1830}
1831
1832/// Check if the type of a class element has an accessible destructor, and marks
1833/// it referenced. Returns true if we shouldn't form a reference to the
1834/// destructor.
1835///
1836/// Aggregate initialization requires a class element's destructor be
1837/// accessible per 11.6.1 [dcl.init.aggr]:
1838///
1839/// The destructor for each element of class type is potentially invoked
1840/// (15.4 [class.dtor]) from the context where the aggregate initialization
1841/// occurs.
1842static bool checkDestructorReference(QualType ElementType, SourceLocation Loc,
1843 Sema &SemaRef) {
1844 auto *CXXRD = ElementType->getAsCXXRecordDecl();
1845 if (!CXXRD)
1846 return false;
1847
1848 CXXDestructorDecl *Destructor = SemaRef.LookupDestructor(CXXRD);
1849 SemaRef.CheckDestructorAccess(Loc, Destructor,
1850 SemaRef.PDiag(diag::err_access_dtor_temp)
1851 << ElementType);
1852 SemaRef.MarkFunctionReferenced(Loc, Destructor);
1853 return SemaRef.DiagnoseUseOfDecl(Destructor, Loc);
1854}
1855
1856void InitListChecker::CheckArrayType(const InitializedEntity &Entity,
1857 InitListExpr *IList, QualType &DeclType,
1858 llvm::APSInt elementIndex,
1859 bool SubobjectIsDesignatorContext,
1860 unsigned &Index,
1861 InitListExpr *StructuredList,
1862 unsigned &StructuredIndex) {
1863 const ArrayType *arrayType = SemaRef.Context.getAsArrayType(DeclType);
1864
1865 if (!VerifyOnly) {
1866 if (checkDestructorReference(arrayType->getElementType(),
1867 IList->getEndLoc(), SemaRef)) {
1868 hadError = true;
1869 return;
1870 }
1871 }
1872
1873 // Check for the special-case of initializing an array with a string.
1874 if (Index < IList->getNumInits()) {
1875 if (IsStringInit(IList->getInit(Index), arrayType, SemaRef.Context) ==
1876 SIF_None) {
1877 // We place the string literal directly into the resulting
1878 // initializer list. This is the only place where the structure
1879 // of the structured initializer list doesn't match exactly,
1880 // because doing so would involve allocating one character
1881 // constant for each string.
1882 // FIXME: Should we do these checks in verify-only mode too?
1883 if (!VerifyOnly)
1884 CheckStringInit(IList->getInit(Index), DeclType, arrayType, SemaRef);
1885 if (StructuredList) {
1886 UpdateStructuredListElement(StructuredList, StructuredIndex,
1887 IList->getInit(Index));
1888 StructuredList->resizeInits(SemaRef.Context, StructuredIndex);
1889 }
1890 ++Index;
1891 return;
1892 }
1893 }
1894 if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(arrayType)) {
1895 // Check for VLAs; in standard C it would be possible to check this
1896 // earlier, but I don't know where clang accepts VLAs (gcc accepts
1897 // them in all sorts of strange places).
1898 if (!VerifyOnly)
1899 SemaRef.Diag(VAT->getSizeExpr()->getBeginLoc(),
1900 diag::err_variable_object_no_init)
1901 << VAT->getSizeExpr()->getSourceRange();
1902 hadError = true;
1903 ++Index;
1904 ++StructuredIndex;
1905 return;
1906 }
1907
1908 // We might know the maximum number of elements in advance.
1909 llvm::APSInt maxElements(elementIndex.getBitWidth(),
1910 elementIndex.isUnsigned());
1911 bool maxElementsKnown = false;
1912 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(arrayType)) {
1913 maxElements = CAT->getSize();
1914 elementIndex = elementIndex.extOrTrunc(maxElements.getBitWidth());
1915 elementIndex.setIsUnsigned(maxElements.isUnsigned());
1916 maxElementsKnown = true;
1917 }
1918
1919 QualType elementType = arrayType->getElementType();
1920 while (Index < IList->getNumInits()) {
1921 Expr *Init = IList->getInit(Index);
1922 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
1923 // If we're not the subobject that matches up with the '{' for
1924 // the designator, we shouldn't be handling the
1925 // designator. Return immediately.
1926 if (!SubobjectIsDesignatorContext)
1927 return;
1928
1929 // Handle this designated initializer. elementIndex will be
1930 // updated to be the next array element we'll initialize.
1931 if (CheckDesignatedInitializer(Entity, IList, DIE, 0,
1932 DeclType, nullptr, &elementIndex, Index,
1933 StructuredList, StructuredIndex, true,
1934 false)) {
1935 hadError = true;
1936 continue;
1937 }
1938
1939 if (elementIndex.getBitWidth() > maxElements.getBitWidth())
1940 maxElements = maxElements.extend(elementIndex.getBitWidth());
1941 else if (elementIndex.getBitWidth() < maxElements.getBitWidth())
1942 elementIndex = elementIndex.extend(maxElements.getBitWidth());
1943 elementIndex.setIsUnsigned(maxElements.isUnsigned());
1944
1945 // If the array is of incomplete type, keep track of the number of
1946 // elements in the initializer.
1947 if (!maxElementsKnown && elementIndex > maxElements)
1948 maxElements = elementIndex;
1949
1950 continue;
1951 }
1952
1953 // If we know the maximum number of elements, and we've already
1954 // hit it, stop consuming elements in the initializer list.
1955 if (maxElementsKnown && elementIndex == maxElements)
1956 break;
1957
1958 InitializedEntity ElementEntity =
1959 InitializedEntity::InitializeElement(SemaRef.Context, StructuredIndex,
1960 Entity);
1961 // Check this element.
1962 CheckSubElementType(ElementEntity, IList, elementType, Index,
1963 StructuredList, StructuredIndex);
1964 ++elementIndex;
1965
1966 // If the array is of incomplete type, keep track of the number of
1967 // elements in the initializer.
1968 if (!maxElementsKnown && elementIndex > maxElements)
1969 maxElements = elementIndex;
1970 }
1971 if (!hadError && DeclType->isIncompleteArrayType() && !VerifyOnly) {
1972 // If this is an incomplete array type, the actual type needs to
1973 // be calculated here.
1974 llvm::APSInt Zero(maxElements.getBitWidth(), maxElements.isUnsigned());
1975 if (maxElements == Zero && !Entity.isVariableLengthArrayNew()) {
1976 // Sizing an array implicitly to zero is not allowed by ISO C,
1977 // but is supported by GNU.
1978 SemaRef.Diag(IList->getBeginLoc(), diag::ext_typecheck_zero_array_size);
1979 }
1980
1981 DeclType = SemaRef.Context.getConstantArrayType(
1982 elementType, maxElements, nullptr, ArrayType::Normal, 0);
1983 }
1984 if (!hadError) {
1985 // If there are any members of the array that get value-initialized, check
1986 // that is possible. That happens if we know the bound and don't have
1987 // enough elements, or if we're performing an array new with an unknown
1988 // bound.
1989 if ((maxElementsKnown && elementIndex < maxElements) ||
1990 Entity.isVariableLengthArrayNew())
1991 CheckEmptyInitializable(
1992 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity),
1993 IList->getEndLoc());
1994 }
1995}
1996
1997bool InitListChecker::CheckFlexibleArrayInit(const InitializedEntity &Entity,
1998 Expr *InitExpr,
1999 FieldDecl *Field,
2000 bool TopLevelObject) {
2001 // Handle GNU flexible array initializers.
2002 unsigned FlexArrayDiag;
2003 if (isa<InitListExpr>(InitExpr) &&
2004 cast<InitListExpr>(InitExpr)->getNumInits() == 0) {
2005 // Empty flexible array init always allowed as an extension
2006 FlexArrayDiag = diag::ext_flexible_array_init;
2007 } else if (!TopLevelObject) {
2008 // Disallow flexible array init on non-top-level object
2009 FlexArrayDiag = diag::err_flexible_array_init;
2010 } else if (Entity.getKind() != InitializedEntity::EK_Variable) {
2011 // Disallow flexible array init on anything which is not a variable.
2012 FlexArrayDiag = diag::err_flexible_array_init;
2013 } else if (cast<VarDecl>(Entity.getDecl())->hasLocalStorage()) {
2014 // Disallow flexible array init on local variables.
2015 FlexArrayDiag = diag::err_flexible_array_init;
2016 } else {
2017 // Allow other cases.
2018 FlexArrayDiag = diag::ext_flexible_array_init;
2019 }
2020
2021 if (!VerifyOnly) {
2022 SemaRef.Diag(InitExpr->getBeginLoc(), FlexArrayDiag)
2023 << InitExpr->getBeginLoc();
2024 SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
2025 << Field;
2026 }
2027
2028 return FlexArrayDiag != diag::ext_flexible_array_init;
2029}
2030
2031void InitListChecker::CheckStructUnionTypes(
2032 const InitializedEntity &Entity, InitListExpr *IList, QualType DeclType,
2033 CXXRecordDecl::base_class_range Bases, RecordDecl::field_iterator Field,
2034 bool SubobjectIsDesignatorContext, unsigned &Index,
2035 InitListExpr *StructuredList, unsigned &StructuredIndex,
2036 bool TopLevelObject) {
2037 RecordDecl *structDecl = DeclType->castAs<RecordType>()->getDecl();
2038
2039 // If the record is invalid, some of it's members are invalid. To avoid
2040 // confusion, we forgo checking the initializer for the entire record.
2041 if (structDecl->isInvalidDecl()) {
2042 // Assume it was supposed to consume a single initializer.
2043 ++Index;
2044 hadError = true;
2045 return;
2046 }
2047
2048 if (DeclType->isUnionType() && IList->getNumInits() == 0) {
2049 RecordDecl *RD = DeclType->castAs<RecordType>()->getDecl();
2050
2051 if (!VerifyOnly)
2052 for (FieldDecl *FD : RD->fields()) {
2053 QualType ET = SemaRef.Context.getBaseElementType(FD->getType());
2054 if (checkDestructorReference(ET, IList->getEndLoc(), SemaRef)) {
2055 hadError = true;
2056 return;
2057 }
2058 }
2059
2060 // If there's a default initializer, use it.
2061 if (isa<CXXRecordDecl>(RD) &&
2062 cast<CXXRecordDecl>(RD)->hasInClassInitializer()) {
2063 if (!StructuredList)
2064 return;
2065 for (RecordDecl::field_iterator FieldEnd = RD->field_end();
2066 Field != FieldEnd; ++Field) {
2067 if (Field->hasInClassInitializer()) {
2068 StructuredList->setInitializedFieldInUnion(*Field);
2069 // FIXME: Actually build a CXXDefaultInitExpr?
2070 return;
2071 }
2072 }
2073 }
2074
2075 // Value-initialize the first member of the union that isn't an unnamed
2076 // bitfield.
2077 for (RecordDecl::field_iterator FieldEnd = RD->field_end();
2078 Field != FieldEnd; ++Field) {
2079 if (!Field->isUnnamedBitfield()) {
2080 CheckEmptyInitializable(
2081 InitializedEntity::InitializeMember(*Field, &Entity),
2082 IList->getEndLoc());
2083 if (StructuredList)
2084 StructuredList->setInitializedFieldInUnion(*Field);
2085 break;
2086 }
2087 }
2088 return;
2089 }
2090
2091 bool InitializedSomething = false;
2092
2093 // If we have any base classes, they are initialized prior to the fields.
2094 for (auto &Base : Bases) {
2095 Expr *Init = Index < IList->getNumInits() ? IList->getInit(Index) : nullptr;
2096
2097 // Designated inits always initialize fields, so if we see one, all
2098 // remaining base classes have no explicit initializer.
2099 if (Init && isa<DesignatedInitExpr>(Init))
2100 Init = nullptr;
2101
2102 SourceLocation InitLoc = Init ? Init->getBeginLoc() : IList->getEndLoc();
2103 InitializedEntity BaseEntity = InitializedEntity::InitializeBase(
2104 SemaRef.Context, &Base, false, &Entity);
2105 if (Init) {
2106 CheckSubElementType(BaseEntity, IList, Base.getType(), Index,
2107 StructuredList, StructuredIndex);
2108 InitializedSomething = true;
2109 } else {
2110 CheckEmptyInitializable(BaseEntity, InitLoc);
2111 }
2112
2113 if (!VerifyOnly)
2114 if (checkDestructorReference(Base.getType(), InitLoc, SemaRef)) {
2115 hadError = true;
2116 return;
2117 }
2118 }
2119
2120 // If structDecl is a forward declaration, this loop won't do
2121 // anything except look at designated initializers; That's okay,
2122 // because an error should get printed out elsewhere. It might be
2123 // worthwhile to skip over the rest of the initializer, though.
2124 RecordDecl *RD = DeclType->castAs<RecordType>()->getDecl();
2125 RecordDecl::field_iterator FieldEnd = RD->field_end();
2126 size_t NumRecordFields = std::distance(RD->field_begin(), RD->field_end());
2127 bool CheckForMissingFields =
2128 !IList->isIdiomaticZeroInitializer(SemaRef.getLangOpts());
2129 bool HasDesignatedInit = false;
2130
2131 while (Index < IList->getNumInits()) {
2132 Expr *Init = IList->getInit(Index);
2133 SourceLocation InitLoc = Init->getBeginLoc();
2134
2135 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
2136 // If we're not the subobject that matches up with the '{' for
2137 // the designator, we shouldn't be handling the
2138 // designator. Return immediately.
2139 if (!SubobjectIsDesignatorContext)
2140 return;
2141
2142 HasDesignatedInit = true;
2143
2144 // Handle this designated initializer. Field will be updated to
2145 // the next field that we'll be initializing.
2146 if (CheckDesignatedInitializer(Entity, IList, DIE, 0,
2147 DeclType, &Field, nullptr, Index,
2148 StructuredList, StructuredIndex,
2149 true, TopLevelObject))
2150 hadError = true;
2151 else if (!VerifyOnly) {
2152 // Find the field named by the designated initializer.
2153 RecordDecl::field_iterator F = RD->field_begin();
2154 while (std::next(F) != Field)
2155 ++F;
2156 QualType ET = SemaRef.Context.getBaseElementType(F->getType());
2157 if (checkDestructorReference(ET, InitLoc, SemaRef)) {
2158 hadError = true;
2159 return;
2160 }
2161 }
2162
2163 InitializedSomething = true;
2164
2165 // Disable check for missing fields when designators are used.
2166 // This matches gcc behaviour.
2167 CheckForMissingFields = false;
2168 continue;
2169 }
2170
2171 if (Field == FieldEnd) {
2172 // We've run out of fields. We're done.
2173 break;
2174 }
2175
2176 // Check if this is an initializer of forms:
2177 //
2178 // struct foo f = {};
2179 // struct foo g = {0};
2180 //
2181 // These are okay for randomized structures. [C99 6.7.8p19]
2182 //
2183 // Also, if there is only one element in the structure, we allow something
2184 // like this, because it's really not randomized in the tranditional sense.
2185 //
2186 // struct foo h = {bar};
2187 auto IsZeroInitializer = [&](const Expr *I) {
2188 if (IList->getNumInits() == 1) {
2189 if (NumRecordFields == 1)
2190 return true;
2191 if (const auto *IL = dyn_cast<IntegerLiteral>(I))
2192 return IL->getValue().isZero();
2193 }
2194 return false;
2195 };
2196
2197 // Don't allow non-designated initializers on randomized structures.
2198 if (RD->isRandomized() && !IsZeroInitializer(Init)) {
2199 if (!VerifyOnly)
2200 SemaRef.Diag(InitLoc, diag::err_non_designated_init_used);
2201 hadError = true;
2202 break;
2203 }
2204
2205 // We've already initialized a member of a union. We're done.
2206 if (InitializedSomething && DeclType->isUnionType())
2207 break;
2208
2209 // If we've hit the flexible array member at the end, we're done.
2210 if (Field->getType()->isIncompleteArrayType())
2211 break;
2212
2213 if (Field->isUnnamedBitfield()) {
2214 // Don't initialize unnamed bitfields, e.g. "int : 20;"
2215 ++Field;
2216 continue;
2217 }
2218
2219 // Make sure we can use this declaration.
2220 bool InvalidUse;
2221 if (VerifyOnly)
2222 InvalidUse = !SemaRef.CanUseDecl(*Field, TreatUnavailableAsInvalid);
2223 else
2224 InvalidUse = SemaRef.DiagnoseUseOfDecl(
2225 *Field, IList->getInit(Index)->getBeginLoc());
2226 if (InvalidUse) {
2227 ++Index;
2228 ++Field;
2229 hadError = true;
2230 continue;
2231 }
2232
2233 if (!VerifyOnly) {
2234 QualType ET = SemaRef.Context.getBaseElementType(Field->getType());
2235 if (checkDestructorReference(ET, InitLoc, SemaRef)) {
2236 hadError = true;
2237 return;
2238 }
2239 }
2240
2241 InitializedEntity MemberEntity =
2242 InitializedEntity::InitializeMember(*Field, &Entity);
2243 CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
2244 StructuredList, StructuredIndex);
2245 InitializedSomething = true;
2246
2247 if (DeclType->isUnionType() && StructuredList) {
2248 // Initialize the first field within the union.
2249 StructuredList->setInitializedFieldInUnion(*Field);
2250 }
2251
2252 ++Field;
2253 }
2254
2255 // Emit warnings for missing struct field initializers.
2256 if (!VerifyOnly && InitializedSomething && CheckForMissingFields &&
2257 Field != FieldEnd && !Field->getType()->isIncompleteArrayType() &&
2258 !DeclType->isUnionType()) {
2259 // It is possible we have one or more unnamed bitfields remaining.
2260 // Find first (if any) named field and emit warning.
2261 for (RecordDecl::field_iterator it = Field, end = RD->field_end();
2262 it != end; ++it) {
2263 if (!it->isUnnamedBitfield() && !it->hasInClassInitializer()) {
2264 SemaRef.Diag(IList->getSourceRange().getEnd(),
2265 diag::warn_missing_field_initializers) << *it;
2266 break;
2267 }
2268 }
2269 }
2270
2271 // Check that any remaining fields can be value-initialized if we're not
2272 // building a structured list. (If we are, we'll check this later.)
2273 if (!StructuredList && Field != FieldEnd && !DeclType->isUnionType() &&
2274 !Field->getType()->isIncompleteArrayType()) {
2275 for (; Field != FieldEnd && !hadError; ++Field) {
2276 if (!Field->isUnnamedBitfield() && !Field->hasInClassInitializer())
2277 CheckEmptyInitializable(
2278 InitializedEntity::InitializeMember(*Field, &Entity),
2279 IList->getEndLoc());
2280 }
2281 }
2282
2283 // Check that the types of the remaining fields have accessible destructors.
2284 if (!VerifyOnly) {
2285 // If the initializer expression has a designated initializer, check the
2286 // elements for which a designated initializer is not provided too.
2287 RecordDecl::field_iterator I = HasDesignatedInit ? RD->field_begin()
2288 : Field;
2289 for (RecordDecl::field_iterator E = RD->field_end(); I != E; ++I) {
2290 QualType ET = SemaRef.Context.getBaseElementType(I->getType());
2291 if (checkDestructorReference(ET, IList->getEndLoc(), SemaRef)) {
2292 hadError = true;
2293 return;
2294 }
2295 }
2296 }
2297
2298 if (Field == FieldEnd || !Field->getType()->isIncompleteArrayType() ||
2299 Index >= IList->getNumInits())
2300 return;
2301
2302 if (CheckFlexibleArrayInit(Entity, IList->getInit(Index), *Field,
2303 TopLevelObject)) {
2304 hadError = true;
2305 ++Index;
2306 return;
2307 }
2308
2309 InitializedEntity MemberEntity =
2310 InitializedEntity::InitializeMember(*Field, &Entity);
2311
2312 if (isa<InitListExpr>(IList->getInit(Index)))
2313 CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
2314 StructuredList, StructuredIndex);
2315 else
2316 CheckImplicitInitList(MemberEntity, IList, Field->getType(), Index,
2317 StructuredList, StructuredIndex);
2318}
2319
2320/// Expand a field designator that refers to a member of an
2321/// anonymous struct or union into a series of field designators that
2322/// refers to the field within the appropriate subobject.
2323///
2324static void ExpandAnonymousFieldDesignator(Sema &SemaRef,
2325 DesignatedInitExpr *DIE,
2326 unsigned DesigIdx,
2327 IndirectFieldDecl *IndirectField) {
2328 typedef DesignatedInitExpr::Designator Designator;
2329
2330 // Build the replacement designators.
2331 SmallVector<Designator, 4> Replacements;
2332 for (IndirectFieldDecl::chain_iterator PI = IndirectField->chain_begin(),
2333 PE = IndirectField->chain_end(); PI != PE; ++PI) {
2334 if (PI + 1 == PE)
2335 Replacements.push_back(Designator((IdentifierInfo *)nullptr,
2336 DIE->getDesignator(DesigIdx)->getDotLoc(),
2337 DIE->getDesignator(DesigIdx)->getFieldLoc()));
2338 else
2339 Replacements.push_back(Designator((IdentifierInfo *)nullptr,
2340 SourceLocation(), SourceLocation()));
2341 assert(isa<FieldDecl>(*PI))(static_cast <bool> (isa<FieldDecl>(*PI)) ? void (
0) : __assert_fail ("isa<FieldDecl>(*PI)", "clang/lib/Sema/SemaInit.cpp"
, 2341, __extension__ __PRETTY_FUNCTION__))
;
2342 Replacements.back().setField(cast<FieldDecl>(*PI));
2343 }
2344
2345 // Expand the current designator into the set of replacement
2346 // designators, so we have a full subobject path down to where the
2347 // member of the anonymous struct/union is actually stored.
2348 DIE->ExpandDesignator(SemaRef.Context, DesigIdx, &Replacements[0],
2349 &Replacements[0] + Replacements.size());
2350}
2351
2352static DesignatedInitExpr *CloneDesignatedInitExpr(Sema &SemaRef,
2353 DesignatedInitExpr *DIE) {
2354 unsigned NumIndexExprs = DIE->getNumSubExprs() - 1;
2355 SmallVector<Expr*, 4> IndexExprs(NumIndexExprs);
2356 for (unsigned I = 0; I < NumIndexExprs; ++I)
2357 IndexExprs[I] = DIE->getSubExpr(I + 1);
2358 return DesignatedInitExpr::Create(SemaRef.Context, DIE->designators(),
2359 IndexExprs,
2360 DIE->getEqualOrColonLoc(),
2361 DIE->usesGNUSyntax(), DIE->getInit());
2362}
2363
2364namespace {
2365
2366// Callback to only accept typo corrections that are for field members of
2367// the given struct or union.
2368class FieldInitializerValidatorCCC final : public CorrectionCandidateCallback {
2369 public:
2370 explicit FieldInitializerValidatorCCC(RecordDecl *RD)
2371 : Record(RD) {}
2372
2373 bool ValidateCandidate(const TypoCorrection &candidate) override {
2374 FieldDecl *FD = candidate.getCorrectionDeclAs<FieldDecl>();
2375 return FD && FD->getDeclContext()->getRedeclContext()->Equals(Record);
2376 }
2377
2378 std::unique_ptr<CorrectionCandidateCallback> clone() override {
2379 return std::make_unique<FieldInitializerValidatorCCC>(*this);
2380 }
2381
2382 private:
2383 RecordDecl *Record;
2384};
2385
2386} // end anonymous namespace
2387
2388/// Check the well-formedness of a C99 designated initializer.
2389///
2390/// Determines whether the designated initializer @p DIE, which
2391/// resides at the given @p Index within the initializer list @p
2392/// IList, is well-formed for a current object of type @p DeclType
2393/// (C99 6.7.8). The actual subobject that this designator refers to
2394/// within the current subobject is returned in either
2395/// @p NextField or @p NextElementIndex (whichever is appropriate).
2396///
2397/// @param IList The initializer list in which this designated
2398/// initializer occurs.
2399///
2400/// @param DIE The designated initializer expression.
2401///
2402/// @param DesigIdx The index of the current designator.
2403///
2404/// @param CurrentObjectType The type of the "current object" (C99 6.7.8p17),
2405/// into which the designation in @p DIE should refer.
2406///
2407/// @param NextField If non-NULL and the first designator in @p DIE is
2408/// a field, this will be set to the field declaration corresponding
2409/// to the field named by the designator. On input, this is expected to be
2410/// the next field that would be initialized in the absence of designation,
2411/// if the complete object being initialized is a struct.
2412///
2413/// @param NextElementIndex If non-NULL and the first designator in @p
2414/// DIE is an array designator or GNU array-range designator, this
2415/// will be set to the last index initialized by this designator.
2416///
2417/// @param Index Index into @p IList where the designated initializer
2418/// @p DIE occurs.
2419///
2420/// @param StructuredList The initializer list expression that
2421/// describes all of the subobject initializers in the order they'll
2422/// actually be initialized.
2423///
2424/// @returns true if there was an error, false otherwise.
2425bool
2426InitListChecker::CheckDesignatedInitializer(const InitializedEntity &Entity,
2427 InitListExpr *IList,
2428 DesignatedInitExpr *DIE,
2429 unsigned DesigIdx,
2430 QualType &CurrentObjectType,
2431 RecordDecl::field_iterator *NextField,
2432 llvm::APSInt *NextElementIndex,
2433 unsigned &Index,
2434 InitListExpr *StructuredList,
2435 unsigned &StructuredIndex,
2436 bool FinishSubobjectInit,
2437 bool TopLevelObject) {
2438 if (DesigIdx == DIE->size()) {
2439 // C++20 designated initialization can result in direct-list-initialization
2440 // of the designated subobject. This is the only way that we can end up
2441 // performing direct initialization as part of aggregate initialization, so
2442 // it needs special handling.
2443 if (DIE->isDirectInit()) {
2444 Expr *Init = DIE->getInit();
2445 assert(isa<InitListExpr>(Init) &&(static_cast <bool> (isa<InitListExpr>(Init) &&
"designator result in direct non-list initialization?") ? void
(0) : __assert_fail ("isa<InitListExpr>(Init) && \"designator result in direct non-list initialization?\""
, "clang/lib/Sema/SemaInit.cpp", 2446, __extension__ __PRETTY_FUNCTION__
))
2446 "designator result in direct non-list initialization?")(static_cast <bool> (isa<InitListExpr>(Init) &&
"designator result in direct non-list initialization?") ? void
(0) : __assert_fail ("isa<InitListExpr>(Init) && \"designator result in direct non-list initialization?\""
, "clang/lib/Sema/SemaInit.cpp", 2446, __extension__ __PRETTY_FUNCTION__
))
;
2447 InitializationKind Kind = InitializationKind::CreateDirectList(
2448 DIE->getBeginLoc(), Init->getBeginLoc(), Init->getEndLoc());
2449 InitializationSequence Seq(SemaRef, Entity, Kind, Init,
2450 /*TopLevelOfInitList*/ true);
2451 if (StructuredList) {
2452 ExprResult Result = VerifyOnly
2453 ? getDummyInit()
2454 : Seq.Perform(SemaRef, Entity, Kind, Init);
2455 UpdateStructuredListElement(StructuredList, StructuredIndex,
2456 Result.get());
2457 }
2458 ++Index;
2459 return !Seq;
2460 }
2461
2462 // Check the actual initialization for the designated object type.
2463 bool prevHadError = hadError;
2464
2465 // Temporarily remove the designator expression from the
2466 // initializer list that the child calls see, so that we don't try
2467 // to re-process the designator.
2468 unsigned OldIndex = Index;
2469 IList->setInit(OldIndex, DIE->getInit());
2470
2471 CheckSubElementType(Entity, IList, CurrentObjectType, Index, StructuredList,
2472 StructuredIndex, /*DirectlyDesignated=*/true);
2473
2474 // Restore the designated initializer expression in the syntactic
2475 // form of the initializer list.
2476 if (IList->getInit(OldIndex) != DIE->getInit())
2477 DIE->setInit(IList->getInit(OldIndex));
2478 IList->setInit(OldIndex, DIE);
2479
2480 return hadError && !prevHadError;
2481 }
2482
2483 DesignatedInitExpr::Designator *D = DIE->getDesignator(DesigIdx);
2484 bool IsFirstDesignator = (DesigIdx == 0);
2485 if (IsFirstDesignator ? FullyStructuredList : StructuredList) {
2486 // Determine the structural initializer list that corresponds to the
2487 // current subobject.
2488 if (IsFirstDesignator)
2489 StructuredList = FullyStructuredList;
2490 else {
2491 Expr *ExistingInit = StructuredIndex < StructuredList->getNumInits() ?
2492 StructuredList->getInit(StructuredIndex) : nullptr;
2493 if (!ExistingInit && StructuredList->hasArrayFiller())
2494 ExistingInit = StructuredList->getArrayFiller();
2495
2496 if (!ExistingInit)
2497 StructuredList = getStructuredSubobjectInit(
2498 IList, Index, CurrentObjectType, StructuredList, StructuredIndex,
2499 SourceRange(D->getBeginLoc(), DIE->getEndLoc()));
2500 else if (InitListExpr *Result = dyn_cast<InitListExpr>(ExistingInit))
2501 StructuredList = Result;
2502 else {
2503 // We are creating an initializer list that initializes the
2504 // subobjects of the current object, but there was already an
2505 // initialization that completely initialized the current
2506 // subobject, e.g., by a compound literal:
2507 //
2508 // struct X { int a, b; };
2509 // struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 };
2510 //
2511 // Here, xs[0].a == 1 and xs[0].b == 3, since the second,
2512 // designated initializer re-initializes only its current object
2513 // subobject [0].b.
2514 diagnoseInitOverride(ExistingInit,
2515 SourceRange(D->getBeginLoc(), DIE->getEndLoc()),
2516 /*FullyOverwritten=*/false);
2517
2518 if (!VerifyOnly) {
2519 if (DesignatedInitUpdateExpr *E =
2520 dyn_cast<DesignatedInitUpdateExpr>(ExistingInit))
2521 StructuredList = E->getUpdater();
2522 else {
2523 DesignatedInitUpdateExpr *DIUE = new (SemaRef.Context)
2524 DesignatedInitUpdateExpr(SemaRef.Context, D->getBeginLoc(),
2525 ExistingInit, DIE->getEndLoc());
2526 StructuredList->updateInit(SemaRef.Context, StructuredIndex, DIUE);
2527 StructuredList = DIUE->getUpdater();
2528 }
2529 } else {
2530 // We don't need to track the structured representation of a
2531 // designated init update of an already-fully-initialized object in
2532 // verify-only mode. The only reason we would need the structure is
2533 // to determine where the uninitialized "holes" are, and in this
2534 // case, we know there aren't any and we can't introduce any.
2535 StructuredList = nullptr;
2536 }
2537 }
2538 }
2539 }
2540
2541 if (D->isFieldDesignator()) {
2542 // C99 6.7.8p7:
2543 //
2544 // If a designator has the form
2545 //
2546 // . identifier
2547 //
2548 // then the current object (defined below) shall have
2549 // structure or union type and the identifier shall be the
2550 // name of a member of that type.
2551 const RecordType *RT = CurrentObjectType->getAs<RecordType>();
2552 if (!RT) {
2553 SourceLocation Loc = D->getDotLoc();
2554 if (Loc.isInvalid())
2555 Loc = D->getFieldLoc();
2556 if (!VerifyOnly)
2557 SemaRef.Diag(Loc, diag::err_field_designator_non_aggr)
2558 << SemaRef.getLangOpts().CPlusPlus << CurrentObjectType;
2559 ++Index;
2560 return true;
2561 }
2562
2563 FieldDecl *KnownField = D->getField();
2564 if (!KnownField) {
2565 IdentifierInfo *FieldName = D->getFieldName();
2566 DeclContext::lookup_result Lookup = RT->getDecl()->lookup(FieldName);
2567 for (NamedDecl *ND : Lookup) {
2568 if (auto *FD = dyn_cast<FieldDecl>(ND)) {
2569 KnownField = FD;
2570 break;
2571 }
2572 if (auto *IFD = dyn_cast<IndirectFieldDecl>(ND)) {
2573 // In verify mode, don't modify the original.
2574 if (VerifyOnly)
2575 DIE = CloneDesignatedInitExpr(SemaRef, DIE);
2576 ExpandAnonymousFieldDesignator(SemaRef, DIE, DesigIdx, IFD);
2577 D = DIE->getDesignator(DesigIdx);
2578 KnownField = cast<FieldDecl>(*IFD->chain_begin());
2579 break;
2580 }
2581 }
2582 if (!KnownField) {
2583 if (VerifyOnly) {
2584 ++Index;
2585 return true; // No typo correction when just trying this out.
2586 }
2587
2588 // Name lookup found something, but it wasn't a field.
2589 if (!Lookup.empty()) {
2590 SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_nonfield)
2591 << FieldName;
2592 SemaRef.Diag(Lookup.front()->getLocation(),
2593 diag::note_field_designator_found);
2594 ++Index;
2595 return true;
2596 }
2597
2598 // Name lookup didn't find anything.
2599 // Determine whether this was a typo for another field name.
2600 FieldInitializerValidatorCCC CCC(RT->getDecl());
2601 if (TypoCorrection Corrected = SemaRef.CorrectTypo(
2602 DeclarationNameInfo(FieldName, D->getFieldLoc()),
2603 Sema::LookupMemberName, /*Scope=*/nullptr, /*SS=*/nullptr, CCC,
2604 Sema::CTK_ErrorRecovery, RT->getDecl())) {
2605 SemaRef.diagnoseTypo(
2606 Corrected,
2607 SemaRef.PDiag(diag::err_field_designator_unknown_suggest)
2608 << FieldName << CurrentObjectType);
2609 KnownField = Corrected.getCorrectionDeclAs<FieldDecl>();
2610 hadError = true;
2611 } else {
2612 // Typo correction didn't find anything.
2613 SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_unknown)
2614 << FieldName << CurrentObjectType;
2615 ++Index;
2616 return true;
2617 }
2618 }
2619 }
2620
2621 unsigned NumBases = 0;
2622 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
2623 NumBases = CXXRD->getNumBases();
2624
2625 unsigned FieldIndex = NumBases;
2626
2627 for (auto *FI : RT->getDecl()->fields()) {
2628 if (FI->isUnnamedBitfield())
2629 continue;
2630 if (declaresSameEntity(KnownField, FI)) {
2631 KnownField = FI;
2632 break;
2633 }
2634 ++FieldIndex;
2635 }
2636
2637 RecordDecl::field_iterator Field =
2638 RecordDecl::field_iterator(DeclContext::decl_iterator(KnownField));
2639
2640 // All of the fields of a union are located at the same place in
2641 // the initializer list.
2642 if (RT->getDecl()->isUnion()) {
2643 FieldIndex = 0;
2644 if (StructuredList) {
2645 FieldDecl *CurrentField = StructuredList->getInitializedFieldInUnion();
2646 if (CurrentField && !declaresSameEntity(CurrentField, *Field)) {
2647 assert(StructuredList->getNumInits() == 1(static_cast <bool> (StructuredList->getNumInits() ==
1 && "A union should never have more than one initializer!"
) ? void (0) : __assert_fail ("StructuredList->getNumInits() == 1 && \"A union should never have more than one initializer!\""
, "clang/lib/Sema/SemaInit.cpp", 2648, __extension__ __PRETTY_FUNCTION__
))
2648 && "A union should never have more than one initializer!")(static_cast <bool> (StructuredList->getNumInits() ==
1 && "A union should never have more than one initializer!"
) ? void (0) : __assert_fail ("StructuredList->getNumInits() == 1 && \"A union should never have more than one initializer!\""
, "clang/lib/Sema/SemaInit.cpp", 2648, __extension__ __PRETTY_FUNCTION__
))
;
2649
2650 Expr *ExistingInit = StructuredList->getInit(0);
2651 if (ExistingInit) {
2652 // We're about to throw away an initializer, emit warning.
2653 diagnoseInitOverride(
2654 ExistingInit, SourceRange(D->getBeginLoc(), DIE->getEndLoc()));
2655 }
2656
2657 // remove existing initializer
2658 StructuredList->resizeInits(SemaRef.Context, 0);
2659 StructuredList->setInitializedFieldInUnion(nullptr);
2660 }
2661
2662 StructuredList->setInitializedFieldInUnion(*Field);
2663 }
2664 }
2665
2666 // Make sure we can use this declaration.
2667 bool InvalidUse;
2668 if (VerifyOnly)
2669 InvalidUse = !SemaRef.CanUseDecl(*Field, TreatUnavailableAsInvalid);
2670 else
2671 InvalidUse = SemaRef.DiagnoseUseOfDecl(*Field, D->getFieldLoc());
2672 if (InvalidUse) {
2673 ++Index;
2674 return true;
2675 }
2676
2677 // C++20 [dcl.init.list]p3:
2678 // The ordered identifiers in the designators of the designated-
2679 // initializer-list shall form a subsequence of the ordered identifiers
2680 // in the direct non-static data members of T.
2681 //
2682 // Note that this is not a condition on forming the aggregate
2683 // initialization, only on actually performing initialization,
2684 // so it is not checked in VerifyOnly mode.
2685 //
2686 // FIXME: This is the only reordering diagnostic we produce, and it only
2687 // catches cases where we have a top-level field designator that jumps
2688 // backwards. This is the only such case that is reachable in an
2689 // otherwise-valid C++20 program, so is the only case that's required for
2690 // conformance, but for consistency, we should diagnose all the other
2691 // cases where a designator takes us backwards too.
2692 if (IsFirstDesignator && !VerifyOnly && SemaRef.getLangOpts().CPlusPlus &&
2693 NextField &&
2694 (*NextField == RT->getDecl()->field_end() ||
2695 (*NextField)->getFieldIndex() > Field->getFieldIndex() + 1)) {
2696 // Find the field that we just initialized.
2697 FieldDecl *PrevField = nullptr;
2698 for (auto FI = RT->getDecl()->field_begin();
2699 FI != RT->getDecl()->field_end(); ++FI) {
2700 if (FI->isUnnamedBitfield())
2701 continue;
2702 if (*NextField != RT->getDecl()->field_end() &&
2703 declaresSameEntity(*FI, **NextField))
2704 break;
2705 PrevField = *FI;
2706 }
2707
2708 if (PrevField &&
2709 PrevField->getFieldIndex() > KnownField->getFieldIndex()) {
2710 SemaRef.Diag(DIE->getBeginLoc(), diag::ext_designated_init_reordered)
2711 << KnownField << PrevField << DIE->getSourceRange();
2712
2713 unsigned OldIndex = NumBases + PrevField->getFieldIndex();
2714 if (StructuredList && OldIndex <= StructuredList->getNumInits()) {
2715 if (Expr *PrevInit = StructuredList->getInit(OldIndex)) {
2716 SemaRef.Diag(PrevInit->getBeginLoc(),
2717 diag::note_previous_field_init)
2718 << PrevField << PrevInit->getSourceRange();
2719 }
2720 }
2721 }
2722 }
2723
2724
2725 // Update the designator with the field declaration.
2726 if (!VerifyOnly)
2727 D->setField(*Field);
2728
2729 // Make sure that our non-designated initializer list has space
2730 // for a subobject corresponding to this field.
2731 if (StructuredList && FieldIndex >= StructuredList->getNumInits())
2732 StructuredList->resizeInits(SemaRef.Context, FieldIndex + 1);
2733
2734 // This designator names a flexible array member.
2735 if (Field->getType()->isIncompleteArrayType()) {
2736 bool Invalid = false;
2737 if ((DesigIdx + 1) != DIE->size()) {
2738 // We can't designate an object within the flexible array
2739 // member (because GCC doesn't allow it).
2740 if (!VerifyOnly) {
2741 DesignatedInitExpr::Designator *NextD
2742 = DIE->getDesignator(DesigIdx + 1);
2743 SemaRef.Diag(NextD->getBeginLoc(),
2744 diag::err_designator_into_flexible_array_member)
2745 << SourceRange(NextD->getBeginLoc(), DIE->getEndLoc());
2746 SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
2747 << *Field;
2748 }
2749 Invalid = true;
2750 }
2751
2752 if (!hadError && !isa<InitListExpr>(DIE->getInit()) &&
2753 !isa<StringLiteral>(DIE->getInit())) {
2754 // The initializer is not an initializer list.
2755 if (!VerifyOnly) {
2756 SemaRef.Diag(DIE->getInit()->getBeginLoc(),
2757 diag::err_flexible_array_init_needs_braces)
2758 << DIE->getInit()->getSourceRange();
2759 SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
2760 << *Field;
2761 }
2762 Invalid = true;
2763 }
2764
2765 // Check GNU flexible array initializer.
2766 if (!Invalid && CheckFlexibleArrayInit(Entity, DIE->getInit(), *Field,
2767 TopLevelObject))
2768 Invalid = true;
2769
2770 if (Invalid) {
2771 ++Index;
2772 return true;
2773 }
2774
2775 // Initialize the array.
2776 bool prevHadError = hadError;
2777 unsigned newStructuredIndex = FieldIndex;
2778 unsigned OldIndex = Index;
2779 IList->setInit(Index, DIE->getInit());
2780
2781 InitializedEntity MemberEntity =
2782 InitializedEntity::InitializeMember(*Field, &Entity);
2783 CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
2784 StructuredList, newStructuredIndex);
2785
2786 IList->setInit(OldIndex, DIE);
2787 if (hadError && !prevHadError) {
2788 ++Field;
2789 ++FieldIndex;
2790 if (NextField)
2791 *NextField = Field;
2792 StructuredIndex = FieldIndex;
2793 return true;
2794 }
2795 } else {
2796 // Recurse to check later designated subobjects.
2797 QualType FieldType = Field->getType();
2798 unsigned newStructuredIndex = FieldIndex;
2799
2800 InitializedEntity MemberEntity =
2801 InitializedEntity::InitializeMember(*Field, &Entity);
2802 if (CheckDesignatedInitializer(MemberEntity, IList, DIE, DesigIdx + 1,
2803 FieldType, nullptr, nullptr, Index,
2804 StructuredList, newStructuredIndex,
2805 FinishSubobjectInit, false))
2806 return true;
2807 }
2808
2809 // Find the position of the next field to be initialized in this
2810 // subobject.
2811 ++Field;
2812 ++FieldIndex;
2813
2814 // If this the first designator, our caller will continue checking
2815 // the rest of this struct/class/union subobject.
2816 if (IsFirstDesignator) {
2817 if (NextField)
2818 *NextField = Field;
2819 StructuredIndex = FieldIndex;
2820 return false;
2821 }
2822
2823 if (!FinishSubobjectInit)
2824 return false;
2825
2826 // We've already initialized something in the union; we're done.
2827 if (RT->getDecl()->isUnion())
2828 return hadError;
2829
2830 // Check the remaining fields within this class/struct/union subobject.
2831 bool prevHadError = hadError;
2832
2833 auto NoBases =
2834 CXXRecordDecl::base_class_range(CXXRecordDecl::base_class_iterator(),
2835 CXXRecordDecl::base_class_iterator());
2836 CheckStructUnionTypes(Entity, IList, CurrentObjectType, NoBases, Field,
2837 false, Index, StructuredList, FieldIndex);
2838 return hadError && !prevHadError;
2839 }
2840
2841 // C99 6.7.8p6:
2842 //
2843 // If a designator has the form
2844 //
2845 // [ constant-expression ]
2846 //
2847 // then the current object (defined below) shall have array
2848 // type and the expression shall be an integer constant
2849 // expression. If the array is of unknown size, any
2850 // nonnegative value is valid.
2851 //
2852 // Additionally, cope with the GNU extension that permits
2853 // designators of the form
2854 //
2855 // [ constant-expression ... constant-expression ]
2856 const ArrayType *AT = SemaRef.Context.getAsArrayType(CurrentObjectType);
2857 if (!AT) {
2858 if (!VerifyOnly)
2859 SemaRef.Diag(D->getLBracketLoc(), diag::err_array_designator_non_array)
2860 << CurrentObjectType;
2861 ++Index;
2862 return true;
2863 }
2864
2865 Expr *IndexExpr = nullptr;
2866 llvm::APSInt DesignatedStartIndex, DesignatedEndIndex;
2867 if (D->isArrayDesignator()) {
2868 IndexExpr = DIE->getArrayIndex(*D);
2869 DesignatedStartIndex = IndexExpr->EvaluateKnownConstInt(SemaRef.Context);
2870 DesignatedEndIndex = DesignatedStartIndex;
2871 } else {
2872 assert(D->isArrayRangeDesignator() && "Need array-range designator")(static_cast <bool> (D->isArrayRangeDesignator() &&
"Need array-range designator") ? void (0) : __assert_fail ("D->isArrayRangeDesignator() && \"Need array-range designator\""
, "clang/lib/Sema/SemaInit.cpp", 2872, __extension__ __PRETTY_FUNCTION__
))
;
2873
2874 DesignatedStartIndex =
2875 DIE->getArrayRangeStart(*D)->EvaluateKnownConstInt(SemaRef.Context);
2876 DesignatedEndIndex =
2877 DIE->getArrayRangeEnd(*D)->EvaluateKnownConstInt(SemaRef.Context);
2878 IndexExpr = DIE->getArrayRangeEnd(*D);
2879
2880 // Codegen can't handle evaluating array range designators that have side
2881 // effects, because we replicate the AST value for each initialized element.
2882 // As such, set the sawArrayRangeDesignator() bit if we initialize multiple
2883 // elements with something that has a side effect, so codegen can emit an
2884 // "error unsupported" error instead of miscompiling the app.
2885 if (DesignatedStartIndex.getZExtValue()!=DesignatedEndIndex.getZExtValue()&&
2886 DIE->getInit()->HasSideEffects(SemaRef.Context) && !VerifyOnly)
2887 FullyStructuredList->sawArrayRangeDesignator();
2888 }
2889
2890 if (isa<ConstantArrayType>(AT)) {
2891 llvm::APSInt MaxElements(cast<ConstantArrayType>(AT)->getSize(), false);
2892 DesignatedStartIndex
2893 = DesignatedStartIndex.extOrTrunc(MaxElements.getBitWidth());
2894 DesignatedStartIndex.setIsUnsigned(MaxElements.isUnsigned());
2895 DesignatedEndIndex
2896 = DesignatedEndIndex.extOrTrunc(MaxElements.getBitWidth());
2897 DesignatedEndIndex.setIsUnsigned(MaxElements.isUnsigned());
2898 if (DesignatedEndIndex >= MaxElements) {
2899 if (!VerifyOnly)
2900 SemaRef.Diag(IndexExpr->getBeginLoc(),
2901 diag::err_array_designator_too_large)
2902 << toString(DesignatedEndIndex, 10) << toString(MaxElements, 10)
2903 << IndexExpr->getSourceRange();
2904 ++Index;
2905 return true;
2906 }
2907 } else {
2908 unsigned DesignatedIndexBitWidth =
2909 ConstantArrayType::getMaxSizeBits(SemaRef.Context);
2910 DesignatedStartIndex =
2911 DesignatedStartIndex.extOrTrunc(DesignatedIndexBitWidth);
2912 DesignatedEndIndex =
2913 DesignatedEndIndex.extOrTrunc(DesignatedIndexBitWidth);
2914 DesignatedStartIndex.setIsUnsigned(true);
2915 DesignatedEndIndex.setIsUnsigned(true);
2916 }
2917
2918 bool IsStringLiteralInitUpdate =
2919 StructuredList && StructuredList->isStringLiteralInit();
2920 if (IsStringLiteralInitUpdate && VerifyOnly) {
2921 // We're just verifying an update to a string literal init. We don't need
2922 // to split the string up into individual characters to do that.
2923 StructuredList = nullptr;
2924 } else if (IsStringLiteralInitUpdate) {
2925 // We're modifying a string literal init; we have to decompose the string
2926 // so we can modify the individual characters.
2927 ASTContext &Context = SemaRef.Context;
2928 Expr *SubExpr = StructuredList->getInit(0)->IgnoreParenImpCasts();
2929
2930 // Compute the character type
2931 QualType CharTy = AT->getElementType();
2932
2933 // Compute the type of the integer literals.
2934 QualType PromotedCharTy = CharTy;
2935 if (CharTy->isPromotableIntegerType())
2936 PromotedCharTy = Context.getPromotedIntegerType(CharTy);
2937 unsigned PromotedCharTyWidth = Context.getTypeSize(PromotedCharTy);
2938
2939 if (StringLiteral *SL = dyn_cast<StringLiteral>(SubExpr)) {
2940 // Get the length of the string.
2941 uint64_t StrLen = SL->getLength();
2942 if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen))
2943 StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue();
2944 StructuredList->resizeInits(Context, StrLen);
2945
2946 // Build a literal for each character in the string, and put them into
2947 // the init list.
2948 for (unsigned i = 0, e = StrLen; i != e; ++i) {
2949 llvm::APInt CodeUnit(PromotedCharTyWidth, SL->getCodeUnit(i));
2950 Expr *Init = new (Context) IntegerLiteral(
2951 Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc());
2952 if (CharTy != PromotedCharTy)
2953 Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast,
2954 Init, nullptr, VK_PRValue,
2955 FPOptionsOverride());
2956 StructuredList->updateInit(Context, i, Init);
2957 }
2958 } else {
2959 ObjCEncodeExpr *E = cast<ObjCEncodeExpr>(SubExpr);
2960 std::string Str;
2961 Context.getObjCEncodingForType(E->getEncodedType(), Str);
2962
2963 // Get the length of the string.
2964 uint64_t StrLen = Str.size();
2965 if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen))
2966 StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue();
2967 StructuredList->resizeInits(Context, StrLen);
2968
2969 // Build a literal for each character in the string, and put them into
2970 // the init list.
2971 for (unsigned i = 0, e = StrLen; i != e; ++i) {
2972 llvm::APInt CodeUnit(PromotedCharTyWidth, Str[i]);
2973 Expr *Init = new (Context) IntegerLiteral(
2974 Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc());
2975 if (CharTy != PromotedCharTy)
2976 Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast,
2977 Init, nullptr, VK_PRValue,
2978 FPOptionsOverride());
2979 StructuredList->updateInit(Context, i, Init);
2980 }
2981 }
2982 }
2983
2984 // Make sure that our non-designated initializer list has space
2985 // for a subobject corresponding to this array element.
2986 if (StructuredList &&
2987 DesignatedEndIndex.getZExtValue() >= StructuredList->getNumInits())
2988 StructuredList->resizeInits(SemaRef.Context,
2989 DesignatedEndIndex.getZExtValue() + 1);
2990
2991 // Repeatedly perform subobject initializations in the range
2992 // [DesignatedStartIndex, DesignatedEndIndex].
2993
2994 // Move to the next designator
2995 unsigned ElementIndex = DesignatedStartIndex.getZExtValue();
2996 unsigned OldIndex = Index;
2997
2998 InitializedEntity ElementEntity =
2999 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
3000
3001 while (DesignatedStartIndex <= DesignatedEndIndex) {
3002 // Recurse to check later designated subobjects.
3003 QualType ElementType = AT->getElementType();
3004 Index = OldIndex;
3005
3006 ElementEntity.setElementIndex(ElementIndex);
3007 if (CheckDesignatedInitializer(
3008 ElementEntity, IList, DIE, DesigIdx + 1, ElementType, nullptr,
3009 nullptr, Index, StructuredList, ElementIndex,
3010 FinishSubobjectInit && (DesignatedStartIndex == DesignatedEndIndex),
3011 false))
3012 return true;
3013
3014 // Move to the next index in the array that we'll be initializing.
3015 ++DesignatedStartIndex;
3016 ElementIndex = DesignatedStartIndex.getZExtValue();
3017 }
3018
3019 // If this the first designator, our caller will continue checking
3020 // the rest of this array subobject.
3021 if (IsFirstDesignator) {
3022 if (NextElementIndex)
3023 *NextElementIndex = DesignatedStartIndex;
3024 StructuredIndex = ElementIndex;
3025 return false;
3026 }
3027
3028 if (!FinishSubobjectInit)
3029 return false;
3030
3031 // Check the remaining elements within this array subobject.
3032 bool prevHadError = hadError;
3033 CheckArrayType(Entity, IList, CurrentObjectType, DesignatedStartIndex,
3034 /*SubobjectIsDesignatorContext=*/false, Index,
3035 StructuredList, ElementIndex);
3036 return hadError && !prevHadError;
3037}
3038
3039// Get the structured initializer list for a subobject of type
3040// @p CurrentObjectType.
3041InitListExpr *
3042InitListChecker::getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
3043 QualType CurrentObjectType,
3044 InitListExpr *StructuredList,
3045 unsigned StructuredIndex,
3046 SourceRange InitRange,
3047 bool IsFullyOverwritten) {
3048 if (!StructuredList)
3049 return nullptr;
3050
3051 Expr *ExistingInit = nullptr;
3052 if (StructuredIndex < StructuredList->getNumInits())
3053 ExistingInit = StructuredList->getInit(StructuredIndex);
3054
3055 if (InitListExpr *Result = dyn_cast_or_null<InitListExpr>(ExistingInit))
3056 // There might have already been initializers for subobjects of the current
3057 // object, but a subsequent initializer list will overwrite the entirety
3058 // of the current object. (See DR 253 and C99 6.7.8p21). e.g.,
3059 //
3060 // struct P { char x[6]; };
3061 // struct P l = { .x[2] = 'x', .x = { [0] = 'f' } };
3062 //
3063 // The first designated initializer is ignored, and l.x is just "f".
3064 if (!IsFullyOverwritten)
3065 return Result;
3066
3067 if (ExistingInit) {
3068 // We are creating an initializer list that initializes the
3069 // subobjects of the current object, but there was already an
3070 // initialization that completely initialized the current
3071 // subobject:
3072 //
3073 // struct X { int a, b; };
3074 // struct X xs[] = { [0] = { 1, 2 }, [0].b = 3 };
3075 //
3076 // Here, xs[0].a == 1 and xs[0].b == 3, since the second,
3077 // designated initializer overwrites the [0].b initializer
3078 // from the prior initialization.
3079 //
3080 // When the existing initializer is an expression rather than an
3081 // initializer list, we cannot decompose and update it in this way.
3082 // For example:
3083 //
3084 // struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 };
3085 //
3086 // This case is handled by CheckDesignatedInitializer.
3087 diagnoseInitOverride(ExistingInit, InitRange);
3088 }
3089
3090 unsigned ExpectedNumInits = 0;
3091 if (Index < IList->getNumInits()) {
3092 if (auto *Init = dyn_cast_or_null<InitListExpr>(IList->getInit(Index)))
3093 ExpectedNumInits = Init->getNumInits();
3094 else
3095 ExpectedNumInits = IList->getNumInits() - Index;
3096 }
3097
3098 InitListExpr *Result =
3099 createInitListExpr(CurrentObjectType, InitRange, ExpectedNumInits);
3100
3101 // Link this new initializer list into the structured initializer
3102 // lists.
3103 StructuredList->updateInit(SemaRef.Context, StructuredIndex, Result);
3104 return Result;
3105}
3106
3107InitListExpr *
3108InitListChecker::createInitListExpr(QualType CurrentObjectType,
3109 SourceRange InitRange,
3110 unsigned ExpectedNumInits) {
3111 InitListExpr *Result
3112 = new (SemaRef.Context) InitListExpr(SemaRef.Context,
3113 InitRange.getBegin(), None,
3114 InitRange.getEnd());
3115
3116 QualType ResultType = CurrentObjectType;
3117 if (!ResultType->isArrayType())
3118 ResultType = ResultType.getNonLValueExprType(SemaRef.Context);
3119 Result->setType(ResultType);
3120
3121 // Pre-allocate storage for the structured initializer list.
3122 unsigned NumElements = 0;
3123
3124 if (const ArrayType *AType
3125 = SemaRef.Context.getAsArrayType(CurrentObjectType)) {
3126 if (const ConstantArrayType *CAType = dyn_cast<ConstantArrayType>(AType)) {
3127 NumElements = CAType->getSize().getZExtValue();
3128 // Simple heuristic so that we don't allocate a very large
3129 // initializer with many empty entries at the end.
3130 if (NumElements > ExpectedNumInits)
3131 NumElements = 0;
3132 }
3133 } else if (const VectorType *VType = CurrentObjectType->getAs<VectorType>()) {
3134 NumElements = VType->getNumElements();
3135 } else if (CurrentObjectType->isRecordType()) {
3136 NumElements = numStructUnionElements(CurrentObjectType);
3137 }
3138
3139 Result->reserveInits(SemaRef.Context, NumElements);
3140
3141 return Result;
3142}
3143
3144/// Update the initializer at index @p StructuredIndex within the
3145/// structured initializer list to the value @p expr.
3146void InitListChecker::UpdateStructuredListElement(InitListExpr *StructuredList,
3147 unsigned &StructuredIndex,
3148 Expr *expr) {
3149 // No structured initializer list to update
3150 if (!StructuredList)
3151 return;
3152
3153 if (Expr *PrevInit = StructuredList->updateInit(SemaRef.Context,
3154 StructuredIndex, expr)) {
3155 // This initializer overwrites a previous initializer.
3156 // No need to diagnose when `expr` is nullptr because a more relevant
3157 // diagnostic has already been issued and this diagnostic is potentially
3158 // noise.
3159 if (expr)
3160 diagnoseInitOverride(PrevInit, expr->getSourceRange());
3161 }
3162
3163 ++StructuredIndex;
3164}
3165
3166/// Determine whether we can perform aggregate initialization for the purposes
3167/// of overload resolution.
3168bool Sema::CanPerformAggregateInitializationForOverloadResolution(
3169 const InitializedEntity &Entity, InitListExpr *From) {
3170 QualType Type = Entity.getType();
3171 InitListChecker Check(*this, Entity, From, Type, /*VerifyOnly=*/true,
3172 /*TreatUnavailableAsInvalid=*/false,
3173 /*InOverloadResolution=*/true);
3174 return !Check.HadError();
3175}
3176
3177/// Check that the given Index expression is a valid array designator
3178/// value. This is essentially just a wrapper around
3179/// VerifyIntegerConstantExpression that also checks for negative values
3180/// and produces a reasonable diagnostic if there is a
3181/// failure. Returns the index expression, possibly with an implicit cast
3182/// added, on success. If everything went okay, Value will receive the
3183/// value of the constant expression.
3184static ExprResult
3185CheckArrayDesignatorExpr(Sema &S, Expr *Index, llvm::APSInt &Value) {
3186 SourceLocation Loc = Index->getBeginLoc();
3187
3188 // Make sure this is an integer constant expression.
3189 ExprResult Result =
3190 S.VerifyIntegerConstantExpression(Index, &Value, Sema::AllowFold);
3191 if (Result.isInvalid())
3192 return Result;
3193
3194 if (Value.isSigned() && Value.isNegative())
3195 return S.Diag(Loc, diag::err_array_designator_negative)
3196 << toString(Value, 10) << Index->getSourceRange();
3197
3198 Value.setIsUnsigned(true);
3199 return Result;
3200}
3201
3202ExprResult Sema::ActOnDesignatedInitializer(Designation &Desig,
3203 SourceLocation EqualOrColonLoc,
3204 bool GNUSyntax,
3205 ExprResult Init) {
3206 typedef DesignatedInitExpr::Designator ASTDesignator;
3207
3208 bool Invalid = false;
3209 SmallVector<ASTDesignator, 32> Designators;
3210 SmallVector<Expr *, 32> InitExpressions;
3211
3212 // Build designators and check array designator expressions.
3213 for (unsigned Idx = 0; Idx < Desig.getNumDesignators(); ++Idx) {
3214 const Designator &D = Desig.getDesignator(Idx);
3215 switch (D.getKind()) {
3216 case Designator::FieldDesignator:
3217 Designators.push_back(ASTDesignator(D.getField(), D.getDotLoc(),
3218 D.getFieldLoc()));
3219 break;
3220
3221 case Designator::ArrayDesignator: {
3222 Expr *Index = static_cast<Expr *>(D.getArrayIndex());
3223 llvm::APSInt IndexValue;
3224 if (!Index->isTypeDependent() && !Index->isValueDependent())
3225 Index = CheckArrayDesignatorExpr(*this, Index, IndexValue).get();
3226 if (!Index)
3227 Invalid = true;
3228 else {
3229 Designators.push_back(ASTDesignator(InitExpressions.size(),
3230 D.getLBracketLoc(),
3231 D.getRBracketLoc()));
3232 InitExpressions.push_back(Index);
3233 }
3234 break;
3235 }
3236
3237 case Designator::ArrayRangeDesignator: {
3238 Expr *StartIndex = static_cast<Expr *>(D.getArrayRangeStart());
3239 Expr *EndIndex = static_cast<Expr *>(D.getArrayRangeEnd());
3240 llvm::APSInt StartValue;
3241 llvm::APSInt EndValue;
3242 bool StartDependent = StartIndex->isTypeDependent() ||
3243 StartIndex->isValueDependent();
3244 bool EndDependent = EndIndex->isTypeDependent() ||
3245 EndIndex->isValueDependent();
3246 if (!StartDependent)
3247 StartIndex =
3248 CheckArrayDesignatorExpr(*this, StartIndex, StartValue).get();
3249 if (!EndDependent)
3250 EndIndex = CheckArrayDesignatorExpr(*this, EndIndex, EndValue).get();
3251
3252 if (!StartIndex || !EndIndex)
3253 Invalid = true;
3254 else {
3255 // Make sure we're comparing values with the same bit width.
3256 if (StartDependent || EndDependent) {
3257 // Nothing to compute.
3258 } else if (StartValue.getBitWidth() > EndValue.getBitWidth())
3259 EndValue = EndValue.extend(StartValue.getBitWidth());
3260 else if (StartValue.getBitWidth() < EndValue.getBitWidth())
3261 StartValue = StartValue.extend(EndValue.getBitWidth());
3262
3263 if (!StartDependent && !EndDependent && EndValue < StartValue) {
3264 Diag(D.getEllipsisLoc(), diag::err_array_designator_empty_range)
3265 << toString(StartValue, 10) << toString(EndValue, 10)
3266 << StartIndex->getSourceRange() << EndIndex->getSourceRange();
3267 Invalid = true;
3268 } else {
3269 Designators.push_back(ASTDesignator(InitExpressions.size(),
3270 D.getLBracketLoc(),
3271 D.getEllipsisLoc(),
3272 D.getRBracketLoc()));
3273 InitExpressions.push_back(StartIndex);
3274 InitExpressions.push_back(EndIndex);
3275 }
3276 }
3277 break;
3278 }
3279 }
3280 }
3281
3282 if (Invalid || Init.isInvalid())
3283 return ExprError();
3284
3285 // Clear out the expressions within the designation.
3286 Desig.ClearExprs(*this);
3287
3288 return DesignatedInitExpr::Create(Context, Designators, InitExpressions,
3289 EqualOrColonLoc, GNUSyntax,
3290 Init.getAs<Expr>());
3291}
3292
3293//===----------------------------------------------------------------------===//
3294// Initialization entity
3295//===----------------------------------------------------------------------===//
3296
3297InitializedEntity::InitializedEntity(ASTContext &Context, unsigned Index,
3298 const InitializedEntity &Parent)
3299 : Parent(&Parent), Index(Index)
3300{
3301 if (const ArrayType *AT = Context.getAsArrayType(Parent.getType())) {
3302 Kind = EK_ArrayElement;
3303 Type = AT->getElementType();
3304 } else if (const VectorType *VT = Parent.getType()->getAs<VectorType>()) {
3305 Kind = EK_VectorElement;
3306 Type = VT->getElementType();
3307 } else {
3308 const ComplexType *CT = Parent.getType()->getAs<ComplexType>();
3309 assert(CT && "Unexpected type")(static_cast <bool> (CT && "Unexpected type") ?
void (0) : __assert_fail ("CT && \"Unexpected type\""
, "clang/lib/Sema/SemaInit.cpp", 3309, __extension__ __PRETTY_FUNCTION__
))
;
3310 Kind = EK_ComplexElement;
3311 Type = CT->getElementType();
3312 }
3313}
3314
3315InitializedEntity
3316InitializedEntity::InitializeBase(ASTContext &Context,
3317 const CXXBaseSpecifier *Base,
3318 bool IsInheritedVirtualBase,
3319 const InitializedEntity *Parent) {
3320 InitializedEntity Result;
3321 Result.Kind = EK_Base;
3322 Result.Parent = Parent;
3323 Result.Base = {Base, IsInheritedVirtualBase};
3324 Result.Type = Base->getType();
3325 return Result;
3326}
3327
3328DeclarationName InitializedEntity::getName() const {
3329 switch (getKind()) {
3330 case EK_Parameter:
3331 case EK_Parameter_CF_Audited: {
3332 ParmVarDecl *D = Parameter.getPointer();
3333 return (D ? D->getDeclName() : DeclarationName());
3334 }
3335
3336 case EK_Variable:
3337 case EK_Member:
3338 case EK_Binding:
3339 case EK_TemplateParameter:
3340 return Variable.VariableOrMember->getDeclName();
3341
3342 case EK_LambdaCapture:
3343 return DeclarationName(Capture.VarID);
3344
3345 case EK_Result:
3346 case EK_StmtExprResult:
3347 case EK_Exception:
3348 case EK_New:
3349 case EK_Temporary:
3350 case EK_Base:
3351 case EK_Delegating:
3352 case EK_ArrayElement:
3353 case EK_VectorElement:
3354 case EK_ComplexElement:
3355 case EK_BlockElement:
3356 case EK_LambdaToBlockConversionBlockElement:
3357 case EK_CompoundLiteralInit:
3358 case EK_RelatedResult:
3359 return DeclarationName();
3360 }
3361
3362 llvm_unreachable("Invalid EntityKind!")::llvm::llvm_unreachable_internal("Invalid EntityKind!", "clang/lib/Sema/SemaInit.cpp"
, 3362)
;
3363}
3364
3365ValueDecl *InitializedEntity::getDecl() const {
3366 switch (getKind()) {
3367 case EK_Variable:
3368 case EK_Member:
3369 case EK_Binding:
3370 case EK_TemplateParameter:
3371 return Variable.VariableOrMember;
3372
3373 case EK_Parameter:
3374 case EK_Parameter_CF_Audited:
3375 return Parameter.getPointer();
3376
3377 case EK_Result:
3378 case EK_StmtExprResult:
3379 case EK_Exception:
3380 case EK_New:
3381 case EK_Temporary:
3382 case EK_Base:
3383 case EK_Delegating:
3384 case EK_ArrayElement:
3385 case EK_VectorElement:
3386 case EK_ComplexElement:
3387 case EK_BlockElement:
3388 case EK_LambdaToBlockConversionBlockElement:
3389 case EK_LambdaCapture:
3390 case EK_CompoundLiteralInit:
3391 case EK_RelatedResult:
3392 return nullptr;
3393 }
3394
3395 llvm_unreachable("Invalid EntityKind!")::llvm::llvm_unreachable_internal("Invalid EntityKind!", "clang/lib/Sema/SemaInit.cpp"
, 3395)
;
3396}
3397
3398bool InitializedEntity::allowsNRVO() const {
3399 switch (getKind()) {
3400 case EK_Result:
3401 case EK_Exception:
3402 return LocAndNRVO.NRVO;
3403
3404 case EK_StmtExprResult:
3405 case EK_Variable:
3406 case EK_Parameter:
3407 case EK_Parameter_CF_Audited:
3408 case EK_TemplateParameter:
3409 case EK_Member:
3410 case EK_Binding:
3411 case EK_New:
3412 case EK_Temporary:
3413 case EK_CompoundLiteralInit:
3414 case EK_Base:
3415 case EK_Delegating:
3416 case EK_ArrayElement:
3417 case EK_VectorElement:
3418 case EK_ComplexElement:
3419 case EK_BlockElement:
3420 case EK_LambdaToBlockConversionBlockElement:
3421 case EK_LambdaCapture:
3422 case EK_RelatedResult:
3423 break;
3424 }
3425
3426 return false;
3427}
3428
3429unsigned InitializedEntity::dumpImpl(raw_ostream &OS) const {
3430 assert(getParent() != this)(static_cast <bool> (getParent() != this) ? void (0) : __assert_fail
("getParent() != this", "clang/lib/Sema/SemaInit.cpp", 3430,
__extension__ __PRETTY_FUNCTION__))
;
3431 unsigned Depth = getParent() ? getParent()->dumpImpl(OS) : 0;
3432 for (unsigned I = 0; I != Depth; ++I)
3433 OS << "`-";
3434
3435 switch (getKind()) {
3436 case EK_Variable: OS << "Variable"; break;
3437 case EK_Parameter: OS << "Parameter"; break;
3438 case EK_Parameter_CF_Audited: OS << "CF audited function Parameter";
3439 break;
3440 case EK_TemplateParameter: OS << "TemplateParameter"; break;
3441 case EK_Result: OS << "Result"; break;
3442 case EK_StmtExprResult: OS << "StmtExprResult"; break;
3443 case EK_Exception: OS << "Exception"; break;
3444 case EK_Member: OS << "Member"; break;
3445 case EK_Binding: OS << "Binding"; break;
3446 case EK_New: OS << "New"; break;
3447 case EK_Temporary: OS << "Temporary"; break;
3448 case EK_CompoundLiteralInit: OS << "CompoundLiteral";break;
3449 case EK_RelatedResult: OS << "RelatedResult"; break;
3450 case EK_Base: OS << "Base"; break;
3451 case EK_Delegating: OS << "Delegating"; break;
3452 case EK_ArrayElement: OS << "ArrayElement " << Index; break;
3453 case EK_VectorElement: OS << "VectorElement " << Index; break;
3454 case EK_ComplexElement: OS << "ComplexElement " << Index; break;
3455 case EK_BlockElement: OS << "Block"; break;
3456 case EK_LambdaToBlockConversionBlockElement:
3457 OS << "Block (lambda)";
3458 break;
3459 case EK_LambdaCapture:
3460 OS << "LambdaCapture ";
3461 OS << DeclarationName(Capture.VarID);
3462 break;
3463 }
3464
3465 if (auto *D = getDecl()) {
3466 OS << " ";
3467 D->printQualifiedName(OS);
3468 }
3469
3470 OS << " '" << getType().getAsString() << "'\n";
3471
3472 return Depth + 1;
3473}
3474
3475LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void InitializedEntity::dump() const {
3476 dumpImpl(llvm::errs());
3477}
3478
3479//===----------------------------------------------------------------------===//
3480// Initialization sequence
3481//===----------------------------------------------------------------------===//
3482
3483void InitializationSequence::Step::Destroy() {
3484 switch (Kind) {
3485 case SK_ResolveAddressOfOverloadedFunction:
3486 case SK_CastDerivedToBasePRValue:
3487 case SK_CastDerivedToBaseXValue:
3488 case SK_CastDerivedToBaseLValue:
3489 case SK_BindReference:
3490 case SK_BindReferenceToTemporary:
3491 case SK_FinalCopy:
3492 case SK_ExtraneousCopyToTemporary:
3493 case SK_UserConversion:
3494 case SK_QualificationConversionPRValue:
3495 case SK_QualificationConversionXValue:
3496 case SK_QualificationConversionLValue:
3497 case SK_FunctionReferenceConversion:
3498 case SK_AtomicConversion:
3499 case SK_ListInitialization:
3500 case SK_UnwrapInitList:
3501 case SK_RewrapInitList:
3502 case SK_ConstructorInitialization:
3503 case SK_ConstructorInitializationFromList:
3504 case SK_ZeroInitialization:
3505 case SK_CAssignment:
3506 case SK_StringInit:
3507 case SK_ObjCObjectConversion:
3508 case SK_ArrayLoopIndex:
3509 case SK_ArrayLoopInit:
3510 case SK_ArrayInit:
3511 case SK_GNUArrayInit:
3512 case SK_ParenthesizedArrayInit:
3513 case SK_PassByIndirectCopyRestore:
3514 case SK_PassByIndirectRestore:
3515 case SK_ProduceObjCObject:
3516 case SK_StdInitializerList:
3517 case SK_StdInitializerListConstructorCall:
3518 case SK_OCLSamplerInit:
3519 case SK_OCLZeroOpaqueType:
3520 break;
3521
3522 case SK_ConversionSequence:
3523 case SK_ConversionSequenceNoNarrowing:
3524 delete ICS;
3525 }
3526}
3527
3528bool InitializationSequence::isDirectReferenceBinding() const {
3529 // There can be some lvalue adjustments after the SK_BindReference step.
3530 for (const Step &S : llvm::reverse(Steps)) {
3531 if (S.Kind == SK_BindReference)
3532 return true;
3533 if (S.Kind == SK_BindReferenceToTemporary)
3534 return false;
3535 }
3536 return false;
3537}
3538
3539bool InitializationSequence::isAmbiguous() const {
3540 if (!Failed())
3541 return false;
3542
3543 switch (getFailureKind()) {
3544 case FK_TooManyInitsForReference:
3545 case FK_ParenthesizedListInitForReference:
3546 case FK_ArrayNeedsInitList:
3547 case FK_ArrayNeedsInitListOrStringLiteral:
3548 case FK_ArrayNeedsInitListOrWideStringLiteral:
3549 case FK_NarrowStringIntoWideCharArray:
3550 case FK_WideStringIntoCharArray:
3551 case FK_IncompatWideStringIntoWideChar:
3552 case FK_PlainStringIntoUTF8Char:
3553 case FK_UTF8StringIntoPlainChar:
3554 case FK_AddressOfOverloadFailed: // FIXME: Could do better
3555 case FK_NonConstLValueReferenceBindingToTemporary:
3556 case FK_NonConstLValueReferenceBindingToBitfield:
3557 case FK_NonConstLValueReferenceBindingToVectorElement:
3558 case FK_NonConstLValueReferenceBindingToMatrixElement:
3559 case FK_NonConstLValueReferenceBindingToUnrelated:
3560 case FK_RValueReferenceBindingToLValue:
3561 case FK_ReferenceAddrspaceMismatchTemporary:
3562 case FK_ReferenceInitDropsQualifiers:
3563 case FK_ReferenceInitFailed:
3564 case FK_ConversionFailed:
3565 case FK_ConversionFromPropertyFailed:
3566 case FK_TooManyInitsForScalar:
3567 case FK_ParenthesizedListInitForScalar:
3568 case FK_ReferenceBindingToInitList:
3569 case FK_InitListBadDestinationType:
3570 case FK_DefaultInitOfConst:
3571 case FK_Incomplete:
3572 case FK_ArrayTypeMismatch:
3573 case FK_NonConstantArrayInit:
3574 case FK_ListInitializationFailed:
3575 case FK_VariableLengthArrayHasInitializer:
3576 case FK_PlaceholderType:
3577 case FK_ExplicitConstructor:
3578 case FK_AddressOfUnaddressableFunction:
3579 return false;
3580
3581 case FK_ReferenceInitOverloadFailed:
3582 case FK_UserConversionOverloadFailed:
3583 case FK_ConstructorOverloadFailed:
3584 case FK_ListConstructorOverloadFailed:
3585 return FailedOverloadResult == OR_Ambiguous;
3586 }
3587
3588 llvm_unreachable("Invalid EntityKind!")::llvm::llvm_unreachable_internal("Invalid EntityKind!", "clang/lib/Sema/SemaInit.cpp"
, 3588)
;
3589}
3590
3591bool InitializationSequence::isConstructorInitialization() const {
3592 return !Steps.empty() && Steps.back().Kind == SK_ConstructorInitialization;
3593}
3594
3595void
3596InitializationSequence
3597::AddAddressOverloadResolutionStep(FunctionDecl *Function,
3598 DeclAccessPair Found,
3599 bool HadMultipleCandidates) {
3600 Step S;
3601 S.Kind = SK_ResolveAddressOfOverloadedFunction;
3602 S.Type = Function->getType();
3603 S.Function.HadMultipleCandidates = HadMultipleCandidates;
3604 S.Function.Function = Function;
3605 S.Function.FoundDecl = Found;
3606 Steps.push_back(S);
3607}
3608
3609void InitializationSequence::AddDerivedToBaseCastStep(QualType BaseType,
3610 ExprValueKind VK) {
3611 Step S;
3612 switch (VK) {
3613 case VK_PRValue:
3614 S.Kind = SK_CastDerivedToBasePRValue;
3615 break;
3616 case VK_XValue: S.Kind = SK_CastDerivedToBaseXValue; break;
3617 case VK_LValue: S.Kind = SK_CastDerivedToBaseLValue; break;
3618 }
3619 S.Type = BaseType;
3620 Steps.push_back(S);
3621}
3622
3623void InitializationSequence::AddReferenceBindingStep(QualType T,
3624 bool BindingTemporary) {
3625 Step S;
3626 S.Kind = BindingTemporary? SK_BindReferenceToTemporary : SK_BindReference;
3627 S.Type = T;
3628 Steps.push_back(S);
3629}
3630
3631void InitializationSequence::AddFinalCopy(QualType T) {
3632 Step S;
3633 S.Kind = SK_FinalCopy;
3634 S.Type = T;
3635 Steps.push_back(S);
3636}
3637
3638void InitializationSequence::AddExtraneousCopyToTemporary(QualType T) {
3639 Step S;
3640 S.Kind = SK_ExtraneousCopyToTemporary;
3641 S.Type = T;
3642 Steps.push_back(S);
3643}
3644
3645void
3646InitializationSequence::AddUserConversionStep(FunctionDecl *Function,
3647 DeclAccessPair FoundDecl,
3648 QualType T,
3649 bool HadMultipleCandidates) {
3650 Step S;
3651 S.Kind = SK_UserConversion;
3652 S.Type = T;
3653 S.Function.HadMultipleCandidates = HadMultipleCandidates;
3654 S.Function.Function = Function;
3655 S.Function.FoundDecl = FoundDecl;
3656 Steps.push_back(S);
3657}
3658
3659void InitializationSequence::AddQualificationConversionStep(QualType Ty,
3660 ExprValueKind VK) {
3661 Step S;
3662 S.Kind = SK_QualificationConversionPRValue; // work around a gcc warning
3663 switch (VK) {
3664 case VK_PRValue:
3665 S.Kind = SK_QualificationConversionPRValue;
3666 break;
3667 case VK_XValue:
3668 S.Kind = SK_QualificationConversionXValue;
3669 break;
3670 case VK_LValue:
3671 S.Kind = SK_QualificationConversionLValue;
3672 break;
3673 }
3674 S.Type = Ty;
3675 Steps.push_back(S);
3676}
3677
3678void InitializationSequence::AddFunctionReferenceConversionStep(QualType Ty) {
3679 Step S;
3680 S.Kind = SK_FunctionReferenceConversion;
3681 S.Type = Ty;
3682 Steps.push_back(S);
3683}
3684
3685void InitializationSequence::AddAtomicConversionStep(QualType Ty) {
3686 Step S;
3687 S.Kind = SK_AtomicConversion;
3688 S.Type = Ty;
3689 Steps.push_back(S);
3690}
3691
3692void InitializationSequence::AddConversionSequenceStep(
3693 const ImplicitConversionSequence &ICS, QualType T,
3694 bool TopLevelOfInitList) {
3695 Step S;
3696 S.Kind = TopLevelOfInitList ? SK_ConversionSequenceNoNarrowing
3697 : SK_ConversionSequence;
3698 S.Type = T;
3699 S.ICS = new ImplicitConversionSequence(ICS);
3700 Steps.push_back(S);
3701}
3702
3703void InitializationSequence::AddListInitializationStep(QualType T) {
3704 Step S;
3705 S.Kind = SK_ListInitialization;
3706 S.Type = T;
3707 Steps.push_back(S);
3708}
3709
3710void InitializationSequence::AddConstructorInitializationStep(
3711 DeclAccessPair FoundDecl, CXXConstructorDecl *Constructor, QualType T,
3712 bool HadMultipleCandidates, bool FromInitList, bool AsInitList) {
3713 Step S;
3714 S.Kind = FromInitList ? AsInitList ? SK_StdInitializerListConstructorCall
3715 : SK_ConstructorInitializationFromList
3716 : SK_ConstructorInitialization;
3717 S.Type = T;
3718 S.Function.HadMultipleCandidates = HadMultipleCandidates;
3719 S.Function.Function = Constructor;
3720 S.Function.FoundDecl = FoundDecl;
3721 Steps.push_back(S);
3722}
3723
3724void InitializationSequence::AddZeroInitializationStep(QualType T) {
3725 Step S;
3726 S.Kind = SK_ZeroInitialization;
3727 S.Type = T;
3728 Steps.push_back(S);
3729}
3730
3731void InitializationSequence::AddCAssignmentStep(QualType T) {
3732 Step S;
3733 S.Kind = SK_CAssignment;
3734 S.Type = T;
3735 Steps.push_back(S);
3736}
3737
3738void InitializationSequence::AddStringInitStep(QualType T) {
3739 Step S;
3740 S.Kind = SK_StringInit;
3741 S.Type = T;
3742 Steps.push_back(S);
3743}
3744
3745void InitializationSequence::AddObjCObjectConversionStep(QualType T) {
3746 Step S;
3747 S.Kind = SK_ObjCObjectConversion;
3748 S.Type = T;
3749 Steps.push_back(S);
3750}
3751
3752void InitializationSequence::AddArrayInitStep(QualType T, bool IsGNUExtension) {
3753 Step S;
3754 S.Kind = IsGNUExtension ? SK_GNUArrayInit : SK_ArrayInit;
3755 S.Type = T;
3756 Steps.push_back(S);
3757}
3758
3759void InitializationSequence::AddArrayInitLoopStep(QualType T, QualType EltT) {
3760 Step S;
3761 S.Kind = SK_ArrayLoopIndex;
3762 S.Type = EltT;
3763 Steps.insert(Steps.begin(), S);
3764
3765 S.Kind = SK_ArrayLoopInit;
3766 S.Type = T;
3767 Steps.push_back(S);
3768}
3769
3770void InitializationSequence::AddParenthesizedArrayInitStep(QualType T) {
3771 Step S;
3772 S.Kind = SK_ParenthesizedArrayInit;
3773 S.Type = T;
3774 Steps.push_back(S);
3775}
3776
3777void InitializationSequence::AddPassByIndirectCopyRestoreStep(QualType type,
3778 bool shouldCopy) {
3779 Step s;
3780 s.Kind = (shouldCopy ? SK_PassByIndirectCopyRestore
3781 : SK_PassByIndirectRestore);
3782 s.Type = type;
3783 Steps.push_back(s);
3784}
3785
3786void InitializationSequence::AddProduceObjCObjectStep(QualType T) {
3787 Step S;
3788 S.Kind = SK_ProduceObjCObject;
3789 S.Type = T;
3790 Steps.push_back(S);
3791}
3792
3793void InitializationSequence::AddStdInitializerListConstructionStep(QualType T) {
3794 Step S;
3795 S.Kind = SK_StdInitializerList;
3796 S.Type = T;
3797 Steps.push_back(S);
3798}
3799
3800void InitializationSequence::AddOCLSamplerInitStep(QualType T) {
3801 Step S;
3802 S.Kind = SK_OCLSamplerInit;
3803 S.Type = T;
3804 Steps.push_back(S);
3805}
3806
3807void InitializationSequence::AddOCLZeroOpaqueTypeStep(QualType T) {
3808 Step S;
3809 S.Kind = SK_OCLZeroOpaqueType;
3810 S.Type = T;
3811 Steps.push_back(S);
3812}
3813
3814void InitializationSequence::RewrapReferenceInitList(QualType T,
3815 InitListExpr *Syntactic) {
3816 assert(Syntactic->getNumInits() == 1 &&(static_cast <bool> (Syntactic->getNumInits() == 1 &&
"Can only rewrap trivial init lists.") ? void (0) : __assert_fail
("Syntactic->getNumInits() == 1 && \"Can only rewrap trivial init lists.\""
, "clang/lib/Sema/SemaInit.cpp", 3817, __extension__ __PRETTY_FUNCTION__
))
3817 "Can only rewrap trivial init lists.")(static_cast <bool> (Syntactic->getNumInits() == 1 &&
"Can only rewrap trivial init lists.") ? void (0) : __assert_fail
("Syntactic->getNumInits() == 1 && \"Can only rewrap trivial init lists.\""
, "clang/lib/Sema/SemaInit.cpp", 3817, __extension__ __PRETTY_FUNCTION__
))
;
3818 Step S;
3819 S.Kind = SK_UnwrapInitList;
3820 S.Type = Syntactic->getInit(0)->getType();
3821 Steps.insert(Steps.begin(), S);
3822
3823 S.Kind = SK_RewrapInitList;
3824 S.Type = T;
3825 S.WrappingSyntacticList = Syntactic;
3826 Steps.push_back(S);
3827}
3828
3829void InitializationSequence::SetOverloadFailure(FailureKind Failure,
3830 OverloadingResult Result) {
3831 setSequenceKind(FailedSequence);
3832 this->Failure = Failure;
3833 this->FailedOverloadResult = Result;
3834}
3835
3836//===----------------------------------------------------------------------===//
3837// Attempt initialization
3838//===----------------------------------------------------------------------===//
3839
3840/// Tries to add a zero initializer. Returns true if that worked.
3841static bool
3842maybeRecoverWithZeroInitialization(Sema &S, InitializationSequence &Sequence,
3843 const InitializedEntity &Entity) {
3844 if (Entity.getKind() != InitializedEntity::EK_Variable)
3845 return false;
3846
3847 VarDecl *VD = cast<VarDecl>(Entity.getDecl());
3848 if (VD->getInit() || VD->getEndLoc().isMacroID())
3849 return false;
3850
3851 QualType VariableTy = VD->getType().getCanonicalType();
3852 SourceLocation Loc = S.getLocForEndOfToken(VD->getEndLoc());
3853 std::string Init = S.getFixItZeroInitializerForType(VariableTy, Loc);
3854 if (!Init.empty()) {
3855 Sequence.AddZeroInitializationStep(Entity.getType());
3856 Sequence.SetZeroInitializationFixit(Init, Loc);
3857 return true;
3858 }
3859 return false;
3860}
3861
3862static void MaybeProduceObjCObject(Sema &S,
3863 InitializationSequence &Sequence,
3864 const InitializedEntity &Entity) {
3865 if (!S.getLangOpts().ObjCAutoRefCount) return;
3866
3867 /// When initializing a parameter, produce the value if it's marked
3868 /// __attribute__((ns_consumed)).
3869 if (Entity.isParameterKind()) {
3870 if (!Entity.isParameterConsumed())
3871 return;
3872
3873 assert(Entity.getType()->isObjCRetainableType() &&(static_cast <bool> (Entity.getType()->isObjCRetainableType
() && "consuming an object of unretainable type?") ? void
(0) : __assert_fail ("Entity.getType()->isObjCRetainableType() && \"consuming an object of unretainable type?\""
, "clang/lib/Sema/SemaInit.cpp", 3874, __extension__ __PRETTY_FUNCTION__
))
3874 "consuming an object of unretainable type?")(static_cast <bool> (Entity.getType()->isObjCRetainableType
() && "consuming an object of unretainable type?") ? void
(0) : __assert_fail ("Entity.getType()->isObjCRetainableType() && \"consuming an object of unretainable type?\""
, "clang/lib/Sema/SemaInit.cpp", 3874, __extension__ __PRETTY_FUNCTION__
))
;
3875 Sequence.AddProduceObjCObjectStep(Entity.getType());
3876
3877 /// When initializing a return value, if the return type is a
3878 /// retainable type, then returns need to immediately retain the
3879 /// object. If an autorelease is required, it will be done at the
3880 /// last instant.
3881 } else if (Entity.getKind() == InitializedEntity::EK_Result ||
3882 Entity.getKind() == InitializedEntity::EK_StmtExprResult) {
3883 if (!Entity.getType()->isObjCRetainableType())
3884 return;
3885
3886 Sequence.AddProduceObjCObjectStep(Entity.getType());
3887 }
3888}
3889
3890static void TryListInitialization(Sema &S,
3891 const InitializedEntity &Entity,
3892 const InitializationKind &Kind,
3893 InitListExpr *InitList,
3894 InitializationSequence &Sequence,
3895 bool TreatUnavailableAsInvalid);
3896
3897/// When initializing from init list via constructor, handle
3898/// initialization of an object of type std::initializer_list<T>.
3899///
3900/// \return true if we have handled initialization of an object of type
3901/// std::initializer_list<T>, false otherwise.
3902static bool TryInitializerListConstruction(Sema &S,
3903 InitListExpr *List,
3904 QualType DestType,
3905 InitializationSequence &Sequence,
3906 bool TreatUnavailableAsInvalid) {
3907 QualType E;
3908 if (!S.isStdInitializerList(DestType, &E))
3909 return false;
3910
3911 if (!S.isCompleteType(List->getExprLoc(), E)) {
3912 Sequence.setIncompleteTypeFailure(E);
3913 return true;
3914 }
3915
3916 // Try initializing a temporary array from the init list.
3917 QualType ArrayType = S.Context.getConstantArrayType(
3918 E.withConst(),
3919 llvm::APInt(S.Context.getTypeSize(S.Context.getSizeType()),
3920 List->getNumInits()),
3921 nullptr, clang::ArrayType::Normal, 0);
3922 InitializedEntity HiddenArray =
3923 InitializedEntity::InitializeTemporary(ArrayType);
3924 InitializationKind Kind = InitializationKind::CreateDirectList(
3925 List->getExprLoc(), List->getBeginLoc(), List->getEndLoc());
3926 TryListInitialization(S, HiddenArray, Kind, List, Sequence,
3927 TreatUnavailableAsInvalid);
3928 if (Sequence)
3929 Sequence.AddStdInitializerListConstructionStep(DestType);
3930 return true;
3931}
3932
3933/// Determine if the constructor has the signature of a copy or move
3934/// constructor for the type T of the class in which it was found. That is,
3935/// determine if its first parameter is of type T or reference to (possibly
3936/// cv-qualified) T.
3937static bool hasCopyOrMoveCtorParam(ASTContext &Ctx,
3938 const ConstructorInfo &Info) {
3939 if (Info.Constructor->getNumParams() == 0)
3940 return false;
3941
3942 QualType ParmT =
3943 Info.Constructor->getParamDecl(0)->getType().getNonReferenceType();
3944 QualType ClassT =
3945 Ctx.getRecordType(cast<CXXRecordDecl>(Info.FoundDecl->getDeclContext()));
3946
3947 return Ctx.hasSameUnqualifiedType(ParmT, ClassT);
3948}
3949
3950static OverloadingResult
3951ResolveConstructorOverload(Sema &S, SourceLocation DeclLoc,
3952 MultiExprArg Args,
3953 OverloadCandidateSet &CandidateSet,
3954 QualType DestType,
3955 DeclContext::lookup_result Ctors,
3956 OverloadCandidateSet::iterator &Best,
3957 bool CopyInitializing, bool AllowExplicit,
3958 bool OnlyListConstructors, bool IsListInit,
3959 bool SecondStepOfCopyInit = false) {
3960 CandidateSet.clear(OverloadCandidateSet::CSK_InitByConstructor);
3961 CandidateSet.setDestAS(DestType.getQualifiers().getAddressSpace());
3962
3963 for (NamedDecl *D : Ctors) {
3964 auto Info = getConstructorInfo(D);
3965 if (!Info.Constructor || Info.Constructor->isInvalidDecl())
3966 continue;
3967
3968 if (OnlyListConstructors && !S.isInitListConstructor(Info.Constructor))
3969 continue;
3970
3971 // C++11 [over.best.ics]p4:
3972 // ... and the constructor or user-defined conversion function is a
3973 // candidate by
3974 // - 13.3.1.3, when the argument is the temporary in the second step
3975 // of a class copy-initialization, or
3976 // - 13.3.1.4, 13.3.1.5, or 13.3.1.6 (in all cases), [not handled here]
3977 // - the second phase of 13.3.1.7 when the initializer list has exactly
3978 // one element that is itself an initializer list, and the target is
3979 // the first parameter of a constructor of class X, and the conversion
3980 // is to X or reference to (possibly cv-qualified X),
3981 // user-defined conversion sequences are not considered.
3982 bool SuppressUserConversions =
3983 SecondStepOfCopyInit ||
3984 (IsListInit && Args.size() == 1 && isa<InitListExpr>(Args[0]) &&
3985 hasCopyOrMoveCtorParam(S.Context, Info));
3986
3987 if (Info.ConstructorTmpl)
3988 S.AddTemplateOverloadCandidate(
3989 Info.ConstructorTmpl, Info.FoundDecl,
3990 /*ExplicitArgs*/ nullptr, Args, CandidateSet, SuppressUserConversions,
3991 /*PartialOverloading=*/false, AllowExplicit);
3992 else {
3993 // C++ [over.match.copy]p1:
3994 // - When initializing a temporary to be bound to the first parameter
3995 // of a constructor [for type T] that takes a reference to possibly
3996 // cv-qualified T as its first argument, called with a single
3997 // argument in the context of direct-initialization, explicit
3998 // conversion functions are also considered.
3999 // FIXME: What if a constructor template instantiates to such a signature?
4000 bool AllowExplicitConv = AllowExplicit && !CopyInitializing &&
4001 Args.size() == 1 &&
4002 hasCopyOrMoveCtorParam(S.Context, Info);
4003 S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl, Args,
4004 CandidateSet, SuppressUserConversions,
4005 /*PartialOverloading=*/false, AllowExplicit,
4006 AllowExplicitConv);
4007 }
4008 }
4009
4010 // FIXME: Work around a bug in C++17 guaranteed copy elision.
4011 //
4012 // When initializing an object of class type T by constructor
4013 // ([over.match.ctor]) or by list-initialization ([over.match.list])
4014 // from a single expression of class type U, conversion functions of
4015 // U that convert to the non-reference type cv T are candidates.
4016 // Explicit conversion functions are only candidates during
4017 // direct-initialization.
4018 //
4019 // Note: SecondStepOfCopyInit is only ever true in this case when
4020 // evaluating whether to produce a C++98 compatibility warning.
4021 if (S.getLangOpts().CPlusPlus17 && Args.size() == 1 &&
4022 !SecondStepOfCopyInit) {
4023 Expr *Initializer = Args[0];
4024 auto *SourceRD = Initializer->getType()->getAsCXXRecordDecl();
4025 if (SourceRD && S.isCompleteType(DeclLoc, Initializer->getType())) {
4026 const auto &Conversions = SourceRD->getVisibleConversionFunctions();
4027 for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) {
4028 NamedDecl *D = *I;
4029 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
4030 D = D->getUnderlyingDecl();
4031
4032 FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
4033 CXXConversionDecl *Conv;
4034 if (ConvTemplate)
4035 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
4036 else
4037 Conv = cast<CXXConversionDecl>(D);
4038
4039 if (ConvTemplate)
4040 S.AddTemplateConversionCandidate(
4041 ConvTemplate, I.getPair(), ActingDC, Initializer, DestType,
4042 CandidateSet, AllowExplicit, AllowExplicit,
4043 /*AllowResultConversion*/ false);
4044 else
4045 S.AddConversionCandidate(Conv, I.getPair(), ActingDC, Initializer,
4046 DestType, CandidateSet, AllowExplicit,
4047 AllowExplicit,
4048 /*AllowResultConversion*/ false);
4049 }
4050 }
4051 }
4052
4053 // Perform overload resolution and return the result.
4054 return CandidateSet.BestViableFunction(S, DeclLoc, Best);
4055}
4056
4057/// Attempt initialization by constructor (C++ [dcl.init]), which
4058/// enumerates the constructors of the initialized entity and performs overload
4059/// resolution to select the best.
4060/// \param DestType The destination class type.
4061/// \param DestArrayType The destination type, which is either DestType or
4062/// a (possibly multidimensional) array of DestType.
4063/// \param IsListInit Is this list-initialization?
4064/// \param IsInitListCopy Is this non-list-initialization resulting from a
4065/// list-initialization from {x} where x is the same
4066/// type as the entity?
4067static void TryConstructorInitialization(Sema &S,
4068 const InitializedEntity &Entity,
4069 const InitializationKind &Kind,
4070 MultiExprArg Args, QualType DestType,
4071 QualType DestArrayType,
4072 InitializationSequence &Sequence,
4073 bool IsListInit = false,
4074 bool IsInitListCopy = false) {
4075 assert(((!IsListInit && !IsInitListCopy) ||(static_cast <bool> (((!IsListInit && !IsInitListCopy
) || (Args.size() == 1 && isa<InitListExpr>(Args
[0]))) && "IsListInit/IsInitListCopy must come with a single initializer list "
"argument.") ? void (0) : __assert_fail ("((!IsListInit && !IsInitListCopy) || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) && \"IsListInit/IsInitListCopy must come with a single initializer list \" \"argument.\""
, "clang/lib/Sema/SemaInit.cpp", 4078, __extension__ __PRETTY_FUNCTION__
))
4076 (Args.size() == 1 && isa<InitListExpr>(Args[0]))) &&(static_cast <bool> (((!IsListInit && !IsInitListCopy
) || (Args.size() == 1 && isa<InitListExpr>(Args
[0]))) && "IsListInit/IsInitListCopy must come with a single initializer list "
"argument.") ? void (0) : __assert_fail ("((!IsListInit && !IsInitListCopy) || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) && \"IsListInit/IsInitListCopy must come with a single initializer list \" \"argument.\""
, "clang/lib/Sema/SemaInit.cpp", 4078, __extension__ __PRETTY_FUNCTION__
))
4077 "IsListInit/IsInitListCopy must come with a single initializer list "(static_cast <bool> (((!IsListInit && !IsInitListCopy
) || (Args.size() == 1 && isa<InitListExpr>(Args
[0]))) && "IsListInit/IsInitListCopy must come with a single initializer list "
"argument.") ? void (0) : __assert_fail ("((!IsListInit && !IsInitListCopy) || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) && \"IsListInit/IsInitListCopy must come with a single initializer list \" \"argument.\""
, "clang/lib/Sema/SemaInit.cpp", 4078, __extension__ __PRETTY_FUNCTION__
))
4078 "argument.")(static_cast <bool> (((!IsListInit && !IsInitListCopy
) || (Args.size() == 1 && isa<InitListExpr>(Args
[0]))) && "IsListInit/IsInitListCopy must come with a single initializer list "
"argument.") ? void (0) : __assert_fail ("((!IsListInit && !IsInitListCopy) || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) && \"IsListInit/IsInitListCopy must come with a single initializer list \" \"argument.\""
, "clang/lib/Sema/SemaInit.cpp", 4078, __extension__ __PRETTY_FUNCTION__
))
;
4079 InitListExpr *ILE =
4080 (IsListInit || IsInitListCopy) ? cast<InitListExpr>(Args[0]) : nullptr;
4081 MultiExprArg UnwrappedArgs =
4082 ILE ? MultiExprArg(ILE->getInits(), ILE->getNumInits()) : Args;
4083
4084 // The type we're constructing needs to be complete.
4085 if (!S.isCompleteType(Kind.getLocation(), DestType)) {
4086 Sequence.setIncompleteTypeFailure(DestType);
4087 return;
4088 }
4089
4090 // C++17 [dcl.init]p17:
4091 // - If the initializer expression is a prvalue and the cv-unqualified
4092 // version of the source type is the same class as the class of the
4093 // destination, the initializer expression is used to initialize the
4094 // destination object.
4095 // Per DR (no number yet), this does not apply when initializing a base
4096 // class or delegating to another constructor from a mem-initializer.
4097 // ObjC++: Lambda captured by the block in the lambda to block conversion
4098 // should avoid copy elision.
4099 if (S.getLangOpts().CPlusPlus17 &&
4100 Entity.getKind() != InitializedEntity::EK_Base &&
4101 Entity.getKind() != InitializedEntity::EK_Delegating &&
4102 Entity.getKind() !=
4103 InitializedEntity::EK_LambdaToBlockConversionBlockElement &&
4104 UnwrappedArgs.size() == 1 && UnwrappedArgs[0]->isPRValue() &&
4105 S.Context.hasSameUnqualifiedType(UnwrappedArgs[0]->getType(), DestType)) {
4106 // Convert qualifications if necessary.
4107 Sequence.AddQualificationConversionStep(DestType, VK_PRValue);
4108 if (ILE)
4109 Sequence.RewrapReferenceInitList(DestType, ILE);
4110 return;
4111 }
4112
4113 const RecordType *DestRecordType = DestType->getAs<RecordType>();
4114 assert(DestRecordType && "Constructor initialization requires record type")(static_cast <bool> (DestRecordType && "Constructor initialization requires record type"
) ? void (0) : __assert_fail ("DestRecordType && \"Constructor initialization requires record type\""
, "clang/lib/Sema/SemaInit.cpp", 4114, __extension__ __PRETTY_FUNCTION__
))
;
4115 CXXRecordDecl *DestRecordDecl
4116 = cast<CXXRecordDecl>(DestRecordType->getDecl());
4117
4118 // Build the candidate set directly in the initialization sequence
4119 // structure, so that it will persist if we fail.
4120 OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
4121
4122 // Determine whether we are allowed to call explicit constructors or
4123 // explicit conversion operators.
4124 bool AllowExplicit = Kind.AllowExplicit() || IsListInit;
4125 bool CopyInitialization = Kind.getKind() == InitializationKind::IK_Copy;
4126
4127 // - Otherwise, if T is a class type, constructors are considered. The
4128 // applicable constructors are enumerated, and the best one is chosen
4129 // through overload resolution.
4130 DeclContext::lookup_result Ctors = S.LookupConstructors(DestRecordDecl);
4131
4132 OverloadingResult Result = OR_No_Viable_Function;
4133 OverloadCandidateSet::iterator Best;
4134 bool AsInitializerList = false;
4135
4136 // C++11 [over.match.list]p1, per DR1467:
4137 // When objects of non-aggregate type T are list-initialized, such that
4138 // 8.5.4 [dcl.init.list] specifies that overload resolution is performed
4139 // according to the rules in this section, overload resolution selects
4140 // the constructor in two phases:
4141 //
4142 // - Initially, the candidate functions are the initializer-list
4143 // constructors of the class T and the argument list consists of the
4144 // initializer list as a single argument.
4145 if (IsListInit) {
4146 AsInitializerList = true;
4147
4148 // If the initializer list has no elements and T has a default constructor,
4149 // the first phase is omitted.
4150 if (!(UnwrappedArgs.empty() && S.LookupDefaultConstructor(DestRecordDecl)))
4151 Result = ResolveConstructorOverload(S, Kind.getLocation(), Args,
4152 CandidateSet, DestType, Ctors, Best,
4153 CopyInitialization, AllowExplicit,
4154 /*OnlyListConstructors=*/true,
4155 IsListInit);
4156 }
4157
4158 // C++11 [over.match.list]p1:
4159 // - If no viable initializer-list constructor is found, overload resolution
4160 // is performed again, where the candidate functions are all the
4161 // constructors of the class T and the argument list consists of the
4162 // elements of the initializer list.
4163 if (Result == OR_No_Viable_Function) {
4164 AsInitializerList = false;
4165 Result = ResolveConstructorOverload(S, Kind.getLocation(), UnwrappedArgs,
4166 CandidateSet, DestType, Ctors, Best,
4167 CopyInitialization, AllowExplicit,
4168 /*OnlyListConstructors=*/false,
4169 IsListInit);
4170 }
4171 if (Result) {
4172 Sequence.SetOverloadFailure(
4173 IsListInit ? InitializationSequence::FK_ListConstructorOverloadFailed
4174 : InitializationSequence::FK_ConstructorOverloadFailed,
4175 Result);
4176
4177 if (Result != OR_Deleted)
4178 return;
4179 }
4180
4181 bool HadMultipleCandidates = (CandidateSet.size() > 1);
4182
4183 // In C++17, ResolveConstructorOverload can select a conversion function
4184 // instead of a constructor.
4185 if (auto *CD = dyn_cast<CXXConversionDecl>(Best->Function)) {
4186 // Add the user-defined conversion step that calls the conversion function.
4187 QualType ConvType = CD->getConversionType();
4188 assert(S.Context.hasSameUnqualifiedType(ConvType, DestType) &&(static_cast <bool> (S.Context.hasSameUnqualifiedType(ConvType
, DestType) && "should not have selected this conversion function"
) ? void (0) : __assert_fail ("S.Context.hasSameUnqualifiedType(ConvType, DestType) && \"should not have selected this conversion function\""
, "clang/lib/Sema/SemaInit.cpp", 4189, __extension__ __PRETTY_FUNCTION__
))
4189 "should not have selected this conversion function")(static_cast <bool> (S.Context.hasSameUnqualifiedType(ConvType
, DestType) && "should not have selected this conversion function"
) ? void (0) : __assert_fail ("S.Context.hasSameUnqualifiedType(ConvType, DestType) && \"should not have selected this conversion function\""
, "clang/lib/Sema/SemaInit.cpp", 4189, __extension__ __PRETTY_FUNCTION__
))
;
4190 Sequence.AddUserConversionStep(CD, Best->FoundDecl, ConvType,
4191 HadMultipleCandidates);
4192 if (!S.Context.hasSameType(ConvType, DestType))
4193 Sequence.AddQualificationConversionStep(DestType, VK_PRValue);
4194 if (IsListInit)
4195 Sequence.RewrapReferenceInitList(Entity.getType(), ILE);
4196 return;
4197 }
4198
4199 CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
4200 if (Result != OR_Deleted) {
4201 // C++11 [dcl.init]p6:
4202 // If a program calls for the default initialization of an object
4203 // of a const-qualified type T, T shall be a class type with a
4204 // user-provided default constructor.
4205 // C++ core issue 253 proposal:
4206 // If the implicit default constructor initializes all subobjects, no
4207 // initializer should be required.
4208 // The 253 proposal is for example needed to process libstdc++ headers
4209 // in 5.x.
4210 if (Kind.getKind() == InitializationKind::IK_Default &&
4211 Entity.getType().isConstQualified()) {
4212 if (!CtorDecl->getParent()->allowConstDefaultInit()) {
4213 if (!maybeRecoverWithZeroInitialization(S, Sequence, Entity))
4214 Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst);
4215 return;
4216 }
4217 }
4218
4219 // C++11 [over.match.list]p1:
4220 // In copy-list-initialization, if an explicit constructor is chosen, the
4221 // initializer is ill-formed.
4222 if (IsListInit && !Kind.AllowExplicit() && CtorDecl->isExplicit()) {
4223 Sequence.SetFailed(InitializationSequence::FK_ExplicitConstructor);
4224 return;
4225 }
4226 }
4227
4228 // [class.copy.elision]p3:
4229 // In some copy-initialization contexts, a two-stage overload resolution
4230 // is performed.
4231 // If the first overload resolution selects a deleted function, we also
4232 // need the initialization sequence to decide whether to perform the second
4233 // overload resolution.
4234 // For deleted functions in other contexts, there is no need to get the
4235 // initialization sequence.
4236 if (Result == OR_Deleted && Kind.getKind() != InitializationKind::IK_Copy)
4237 return;
4238
4239 // Add the constructor initialization step. Any cv-qualification conversion is
4240 // subsumed by the initialization.
4241 Sequence.AddConstructorInitializationStep(
4242 Best->FoundDecl, CtorDecl, DestArrayType, HadMultipleCandidates,
4243 IsListInit | IsInitListCopy, AsInitializerList);
4244}
4245
4246static bool
4247ResolveOverloadedFunctionForReferenceBinding(Sema &S,
4248 Expr *Initializer,
4249 QualType &SourceType,
4250 QualType &UnqualifiedSourceType,
4251 QualType UnqualifiedTargetType,
4252 InitializationSequence &Sequence) {
4253 if (S.Context.getCanonicalType(UnqualifiedSourceType) ==
4254 S.Context.OverloadTy) {
4255 DeclAccessPair Found;
4256 bool HadMultipleCandidates = false;
4257 if (FunctionDecl *Fn
4258 = S.ResolveAddressOfOverloadedFunction(Initializer,
4259 UnqualifiedTargetType,
4260 false, Found,
4261 &HadMultipleCandidates)) {
4262 Sequence.AddAddressOverloadResolutionStep(Fn, Found,
4263 HadMultipleCandidates);
4264 SourceType = Fn->getType();
4265 UnqualifiedSourceType = SourceType.getUnqualifiedType();
4266 } else if (!UnqualifiedTargetType->isRecordType()) {
4267 Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
4268 return true;
4269 }
4270 }
4271 return false;
4272}
4273
4274static void TryReferenceInitializationCore(Sema &S,
4275 const InitializedEntity &Entity,
4276 const InitializationKind &Kind,
4277 Expr *Initializer,
4278 QualType cv1T1, QualType T1,
4279 Qualifiers T1Quals,
4280 QualType cv2T2, QualType T2,
4281 Qualifiers T2Quals,
4282 InitializationSequence &Sequence);
4283
4284static void TryValueInitialization(Sema &S,
4285 const InitializedEntity &Entity,
4286 const InitializationKind &Kind,
4287 InitializationSequence &Sequence,
4288 InitListExpr *InitList = nullptr);
4289
4290/// Attempt list initialization of a reference.
4291static void TryReferenceListInitialization(Sema &S,
4292 const InitializedEntity &Entity,
4293 const InitializationKind &Kind,
4294 InitListExpr *InitList,
4295 InitializationSequence &Sequence,
4296 bool TreatUnavailableAsInvalid) {
4297 // First, catch C++03 where this isn't possible.
4298 if (!S.getLangOpts().CPlusPlus11) {
4299 Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList);
4300 return;
4301 }
4302 // Can't reference initialize a compound literal.
4303 if (Entity.getKind() == InitializedEntity::EK_CompoundLiteralInit) {
4304 Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList);
4305 return;
4306 }
4307
4308 QualType DestType = Entity.getType();
4309 QualType cv1T1 = DestType->castAs<ReferenceType>()->getPointeeType();
4310 Qualifiers T1Quals;
4311 QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals);
4312
4313 // Reference initialization via an initializer list works thus:
4314 // If the initializer list consists of a single element that is
4315 // reference-related to the referenced type, bind directly to that element
4316 // (possibly creating temporaries).
4317 // Otherwise, initialize a temporary with the initializer list and
4318 // bind to that.
4319 if (InitList->getNumInits() == 1) {
4320 Expr *Initializer = InitList->getInit(0);
4321 QualType cv2T2 = S.getCompletedType(Initializer);
4322 Qualifiers T2Quals;
4323 QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals);
4324
4325 // If this fails, creating a temporary wouldn't work either.
4326 if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2,
4327 T1, Sequence))
4328 return;
4329
4330 SourceLocation DeclLoc = Initializer->getBeginLoc();
4331 Sema::ReferenceCompareResult RefRelationship
4332 = S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2);
4333 if (RefRelationship >= Sema::Ref_Related) {
4334 // Try to bind the reference here.
4335 TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1,
4336 T1Quals, cv2T2, T2, T2Quals, Sequence);
4337 if (Sequence)
4338 Sequence.RewrapReferenceInitList(cv1T1, InitList);
4339 return;
4340 }
4341
4342 // Update the initializer if we've resolved an overloaded function.
4343 if (Sequence.step_begin() != Sequence.step_end())
4344 Sequence.RewrapReferenceInitList(cv1T1, InitList);
4345 }
4346 // Perform address space compatibility check.
4347 QualType cv1T1IgnoreAS = cv1T1;
4348 if (T1Quals.hasAddressSpace()) {
4349 Qualifiers T2Quals;
4350 (void)S.Context.getUnqualifiedArrayType(InitList->getType(), T2Quals);
4351 if (!T1Quals.isAddressSpaceSupersetOf(T2Quals)) {
4352 Sequence.SetFailed(
4353 InitializationSequence::FK_ReferenceInitDropsQualifiers);
4354 return;
4355 }
4356 // Ignore address space of reference type at this point and perform address
4357 // space conversion after the reference binding step.
4358 cv1T1IgnoreAS =
4359 S.Context.getQualifiedType(T1, T1Quals.withoutAddressSpace());
4360 }
4361 // Not reference-related. Create a temporary and bind to that.
4362 InitializedEntity TempEntity =
4363 InitializedEntity::InitializeTemporary(cv1T1IgnoreAS);
4364
4365 TryListInitialization(S, TempEntity, Kind, InitList, Sequence,
4366 TreatUnavailableAsInvalid);
4367 if (Sequence) {
4368 if (DestType->isRValueReferenceType() ||
4369 (T1Quals.hasConst() && !T1Quals.hasVolatile())) {
4370 Sequence.AddReferenceBindingStep(cv1T1IgnoreAS,
4371 /*BindingTemporary=*/true);
4372 if (T1Quals.hasAddressSpace())
4373 Sequence.AddQualificationConversionStep(
4374 cv1T1, DestType->isRValueReferenceType() ? VK_XValue : VK_LValue);
4375 } else
4376 Sequence.SetFailed(
4377 InitializationSequence::FK_NonConstLValueReferenceBindingToTemporary);
4378 }
4379}
4380
4381/// Attempt list initialization (C++0x [dcl.init.list])
4382static void TryListInitialization(Sema &S,
4383 const InitializedEntity &Entity,
4384 const InitializationKind &Kind,
4385 InitListExpr *InitList,
4386 InitializationSequence &Sequence,
4387 bool TreatUnavailableAsInvalid) {
4388 QualType DestType = Entity.getType();
4389
4390 // C++ doesn't allow scalar initialization with more than one argument.
4391 // But C99 complex numbers are scalars and it makes sense there.
4392 if (S.getLangOpts().CPlusPlus && DestType->isScalarType() &&
4393 !DestType->isAnyComplexType() && InitList->getNumInits() > 1) {
4394 Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForScalar);
4395 return;
4396 }
4397 if (DestType->isReferenceType()) {
4398 TryReferenceListInitialization(S, Entity, Kind, InitList, Sequence,
4399 TreatUnavailableAsInvalid);
4400 return;
4401 }
4402
4403 if (DestType->isRecordType() &&
4404 !S.isCompleteType(InitList->getBeginLoc(), DestType)) {
4405 Sequence.setIncompleteTypeFailure(DestType);
4406 return;
4407 }
4408
4409 // C++11 [dcl.init.list]p3, per DR1467:
4410 // - If T is a class type and the initializer list has a single element of
4411 // type cv U, where U is T or a class derived from T, the object is
4412 // initialized from that element (by copy-initialization for
4413 // copy-list-initialization, or by direct-initialization for
4414 // direct-list-initialization).
4415 // - Otherwise, if T is a character array and the initializer list has a
4416 // single element that is an appropriately-typed string literal
4417 // (8.5.2 [dcl.init.string]), initialization is performed as described
4418 // in that section.
4419 // - Otherwise, if T is an aggregate, [...] (continue below).
4420 if (S.getLangOpts().CPlusPlus11 && InitList->getNumInits() == 1) {
4421 if (DestType->isRecordType()) {
4422 QualType InitType = InitList->getInit(0)->getType();
4423 if (S.Context.hasSameUnqualifiedType(InitType, DestType) ||
4424 S.IsDerivedFrom(InitList->getBeginLoc(), InitType, DestType)) {
4425 Expr *InitListAsExpr = InitList;
4426 TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType,
4427 DestType, Sequence,
4428 /*InitListSyntax*/false,
4429 /*IsInitListCopy*/true);
4430 return;
4431 }
4432 }
4433 if (const ArrayType *DestAT = S.Context.getAsArrayType(DestType)) {
4434 Expr *SubInit[1] = {InitList->getInit(0)};
4435 if (!isa<VariableArrayType>(DestAT) &&
4436 IsStringInit(SubInit[0], DestAT, S.Context) == SIF_None) {
4437 InitializationKind SubKind =
4438 Kind.getKind() == InitializationKind::IK_DirectList
4439 ? InitializationKind::CreateDirect(Kind.getLocation(),
4440 InitList->getLBraceLoc(),
4441 InitList->getRBraceLoc())
4442 : Kind;
4443 Sequence.InitializeFrom(S, Entity, SubKind, SubInit,
4444 /*TopLevelOfInitList*/ true,
4445 TreatUnavailableAsInvalid);
4446
4447 // TryStringLiteralInitialization() (in InitializeFrom()) will fail if
4448 // the element is not an appropriately-typed string literal, in which
4449 // case we should proceed as in C++11 (below).
4450 if (Sequence) {
4451 Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
4452 return;
4453 }
4454 }
4455 }
4456 }
4457
4458 // C++11 [dcl.init.list]p3:
4459 // - If T is an aggregate, aggregate initialization is performed.
4460 if ((DestType->isRecordType() && !DestType->isAggregateType()) ||
4461 (S.getLangOpts().CPlusPlus11 &&
4462 S.isStdInitializerList(DestType, nullptr))) {
4463 if (S.getLangOpts().CPlusPlus11) {
4464 // - Otherwise, if the initializer list has no elements and T is a
4465 // class type with a default constructor, the object is
4466 // value-initialized.
4467 if (InitList->getNumInits() == 0) {
4468 CXXRecordDecl *RD = DestType->getAsCXXRecordDecl();
4469 if (S.LookupDefaultConstructor(RD)) {
4470 TryValueInitialization(S, Entity, Kind, Sequence, InitList);
4471 return;
4472 }
4473 }
4474
4475 // - Otherwise, if T is a specialization of std::initializer_list<E>,
4476 // an initializer_list object constructed [...]
4477 if (TryInitializerListConstruction(S, InitList, DestType, Sequence,
4478 TreatUnavailableAsInvalid))
4479 return;
4480
4481 // - Otherwise, if T is a class type, constructors are considered.
4482 Expr *InitListAsExpr = InitList;
4483 TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType,
4484 DestType, Sequence, /*InitListSyntax*/true);
4485 } else
4486 Sequence.SetFailed(InitializationSequence::FK_InitListBadDestinationType);
4487 return;
4488 }
4489
4490 if (S.getLangOpts().CPlusPlus && !DestType->isAggregateType() &&
4491 InitList->getNumInits() == 1) {
4492 Expr *E = InitList->getInit(0);
4493
4494 // - Otherwise, if T is an enumeration with a fixed underlying type,
4495 // the initializer-list has a single element v, and the initialization
4496 // is direct-list-initialization, the object is initialized with the
4497 // value T(v); if a narrowing conversion is required to convert v to
4498 // the underlying type of T, the program is ill-formed.
4499 auto *ET = DestType->getAs<EnumType>();
4500 if (S.getLangOpts().CPlusPlus17 &&
4501 Kind.getKind() == InitializationKind::IK_DirectList &&
4502 ET && ET->getDecl()->isFixed() &&
4503 !S.Context.hasSameUnqualifiedType(E->getType(), DestType) &&
4504 (E->getType()->isIntegralOrEnumerationType() ||
4505 E->getType()->isFloatingType())) {
4506 // There are two ways that T(v) can work when T is an enumeration type.
4507 // If there is either an implicit conversion sequence from v to T or
4508 // a conversion function that can convert from v to T, then we use that.
4509 // Otherwise, if v is of integral, enumeration, or floating-point type,
4510 // it is converted to the enumeration type via its underlying type.
4511 // There is no overlap possible between these two cases (except when the
4512 // source value is already of the destination type), and the first
4513 // case is handled by the general case for single-element lists below.
4514 ImplicitConversionSequence ICS;
4515 ICS.setStandard();
4516 ICS.Standard.setAsIdentityConversion();
4517 if (!E->isPRValue())
4518 ICS.Standard.First = ICK_Lvalue_To_Rvalue;
4519 // If E is of a floating-point type, then the conversion is ill-formed
4520 // due to narrowing, but go through the motions in order to produce the
4521 // right diagnostic.
4522 ICS.Standard.Second = E->getType()->isFloatingType()
4523 ? ICK_Floating_Integral
4524 : ICK_Integral_Conversion;
4525 ICS.Standard.setFromType(E->getType());
4526 ICS.Standard.setToType(0, E->getType());
4527 ICS.Standard.setToType(1, DestType);
4528 ICS.Standard.setToType(2, DestType);
4529 Sequence.AddConversionSequenceStep(ICS, ICS.Standard.getToType(2),
4530 /*TopLevelOfInitList*/true);
4531 Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
4532 return;
4533 }
4534
4535 // - Otherwise, if the initializer list has a single element of type E
4536 // [...references are handled above...], the object or reference is
4537 // initialized from that element (by copy-initialization for
4538 // copy-list-initialization, or by direct-initialization for
4539 // direct-list-initialization); if a narrowing conversion is required
4540 // to convert the element to T, the program is ill-formed.
4541 //
4542 // Per core-24034, this is direct-initialization if we were performing
4543 // direct-list-initialization and copy-initialization otherwise.
4544 // We can't use InitListChecker for this, because it always performs
4545 // copy-initialization. This only matters if we might use an 'explicit'
4546 // conversion operator, or for the special case conversion of nullptr_t to
4547 // bool, so we only need to handle those cases.
4548 //
4549 // FIXME: Why not do this in all cases?
4550 Expr *Init = InitList->getInit(0);
4551 if (Init->getType()->isRecordType() ||
4552 (Init->getType()->isNullPtrType() && DestType->isBooleanType())) {
4553 InitializationKind SubKind =
4554 Kind.getKind() == InitializationKind::IK_DirectList
4555 ? InitializationKind::CreateDirect(Kind.getLocation(),
4556 InitList->getLBraceLoc(),
4557 InitList->getRBraceLoc())
4558 : Kind;
4559 Expr *SubInit[1] = { Init };
4560 Sequence.InitializeFrom(S, Entity, SubKind, SubInit,
4561 /*TopLevelOfInitList*/true,
4562 TreatUnavailableAsInvalid);
4563 if (Sequence)
4564 Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
4565 return;
4566 }
4567 }
4568
4569 InitListChecker CheckInitList(S, Entity, InitList,
4570 DestType, /*VerifyOnly=*/true, TreatUnavailableAsInvalid);
4571 if (CheckInitList.HadError()) {
4572 Sequence.SetFailed(InitializationSequence::FK_ListInitializationFailed);
4573 return;
4574 }
4575
4576 // Add the list initialization step with the built init list.
4577 Sequence.AddListInitializationStep(DestType);
4578}
4579
4580/// Try a reference initialization that involves calling a conversion
4581/// function.
4582static OverloadingResult TryRefInitWithConversionFunction(
4583 Sema &S, const InitializedEntity &Entity, const InitializationKind &Kind,
4584 Expr *Initializer, bool AllowRValues, bool IsLValueRef,
4585 InitializationSequence &Sequence) {
4586 QualType DestType = Entity.getType();
4587 QualType cv1T1 = DestType->castAs<ReferenceType>()->getPointeeType();
4588 QualType T1 = cv1T1.getUnqualifiedType();
4589 QualType cv2T2 = Initializer->getType();
4590 QualType T2 = cv2T2.getUnqualifiedType();
4591
4592 assert(!S.CompareReferenceRelationship(Initializer->getBeginLoc(), T1, T2) &&(static_cast <bool> (!S.CompareReferenceRelationship(Initializer
->getBeginLoc(), T1, T2) && "Must have incompatible references when binding via conversion"
) ? void (0) : __assert_fail ("!S.CompareReferenceRelationship(Initializer->getBeginLoc(), T1, T2) && \"Must have incompatible references when binding via conversion\""
, "clang/lib/Sema/SemaInit.cpp", 4593, __extension__ __PRETTY_FUNCTION__
))
4593 "Must have incompatible references when binding via conversion")(static_cast <bool> (!S.CompareReferenceRelationship(Initializer
->getBeginLoc(), T1, T2) && "Must have incompatible references when binding via conversion"
) ? void (0) : __assert_fail ("!S.CompareReferenceRelationship(Initializer->getBeginLoc(), T1, T2) && \"Must have incompatible references when binding via conversion\""
, "clang/lib/Sema/SemaInit.cpp", 4593, __extension__ __PRETTY_FUNCTION__
))
;
4594
4595 // Build the candidate set directly in the initialization sequence
4596 // structure, so that it will persist if we fail.
4597 OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
4598 CandidateSet.clear(OverloadCandidateSet::CSK_InitByUserDefinedConversion);
4599
4600 // Determine whether we are allowed to call explicit conversion operators.
4601 // Note that none of [over.match.copy], [over.match.conv], nor
4602 // [over.match.ref] permit an explicit constructor to be chosen when
4603 // initializing a reference, not even for direct-initialization.
4604 bool AllowExplicitCtors = false;
4605 bool AllowExplicitConvs = Kind.allowExplicitConversionFunctionsInRefBinding();
4606
4607 const RecordType *T1RecordType = nullptr;
4608 if (AllowRValues && (T1RecordType = T1->getAs<RecordType>()) &&
4609 S.isCompleteType(Kind.getLocation(), T1)) {
4610 // The type we're converting to is a class type. Enumerate its constructors
4611 // to see if there is a suitable conversion.
4612 CXXRecordDecl *T1RecordDecl = cast<CXXRecordDecl>(T1RecordType->getDecl());
4613
4614 for (NamedDecl *D : S.LookupConstructors(T1RecordDecl)) {
4615 auto Info = getConstructorInfo(D);
4616 if (!Info.Constructor)
4617 continue;
4618
4619 if (!Info.Constructor->isInvalidDecl() &&
4620 Info.Constructor->isConvertingConstructor(/*AllowExplicit*/true)) {
4621 if (Info.ConstructorTmpl)
4622 S.AddTemplateOverloadCandidate(
4623 Info.ConstructorTmpl, Info.FoundDecl,
4624 /*ExplicitArgs*/ nullptr, Initializer, CandidateSet,
4625 /*SuppressUserConversions=*/true,
4626 /*PartialOverloading*/ false, AllowExplicitCtors);
4627 else
4628 S.AddOverloadCandidate(
4629 Info.Constructor, Info.FoundDecl, Initializer, CandidateSet,
4630 /*SuppressUserConversions=*/true,
4631 /*PartialOverloading*/ false, AllowExplicitCtors);
4632 }
4633 }
4634 }
4635 if (T1RecordType && T1RecordType->getDecl()->isInvalidDecl())
4636 return OR_No_Viable_Function;
4637
4638 const RecordType *T2RecordType = nullptr;
4639 if ((T2RecordType = T2->getAs<RecordType>()) &&
4640 S.isCompleteType(Kind.getLocation(), T2)) {
4641 // The type we're converting from is a class type, enumerate its conversion
4642 // functions.
4643 CXXRecordDecl *T2RecordDecl = cast<CXXRecordDecl>(T2RecordType->getDecl());
4644
4645 const auto &Conversions = T2RecordDecl->getVisibleConversionFunctions();
4646 for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) {
4647 NamedDecl *D = *I;
4648 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
4649 if (isa<UsingShadowDecl>(D))
4650 D = cast<UsingShadowDecl>(D)->getTargetDecl();
4651
4652 FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
4653 CXXConversionDecl *Conv;
4654 if (ConvTemplate)
4655 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
4656 else
4657 Conv = cast<CXXConversionDecl>(D);
4658
4659 // If the conversion function doesn't return a reference type,
4660 // it can't be considered for this conversion unless we're allowed to
4661 // consider rvalues.
4662 // FIXME: Do we need to make sure that we only consider conversion
4663 // candidates with reference-compatible results? That might be needed to
4664 // break recursion.
4665 if ((AllowRValues ||
4666 Conv->getConversionType()->isLValueReferenceType())) {
4667 if (ConvTemplate)
4668 S.AddTemplateConversionCandidate(
4669 ConvTemplate, I.getPair(), ActingDC, Initializer, DestType,
4670 CandidateSet,
4671 /*AllowObjCConversionOnExplicit=*/false, AllowExplicitConvs);
4672 else
4673 S.AddConversionCandidate(
4674 Conv, I.getPair(), ActingDC, Initializer, DestType, CandidateSet,
4675 /*AllowObjCConversionOnExplicit=*/false, AllowExplicitConvs);
4676 }
4677 }
4678 }
4679 if (T2RecordType && T2RecordType->getDecl()->isInvalidDecl())
4680 return OR_No_Viable_Function;
4681
4682 SourceLocation DeclLoc = Initializer->getBeginLoc();
4683
4684 // Perform overload resolution. If it fails, return the failed result.
4685 OverloadCandidateSet::iterator Best;
4686 if (OverloadingResult Result
4687 = CandidateSet.BestViableFunction(S, DeclLoc, Best))
4688 return Result;
4689
4690 FunctionDecl *Function = Best->Function;
4691 // This is the overload that will be used for this initialization step if we
4692 // use this initialization. Mark it as referenced.
4693 Function->setReferenced();
4694
4695 // Compute the returned type and value kind of the conversion.
4696 QualType cv3T3;
4697 if (isa<CXXConversionDecl>(Function))
4698 cv3T3 = Function->getReturnType();
4699 else
4700 cv3T3 = T1;
4701
4702 ExprValueKind VK = VK_PRValue;
4703 if (cv3T3->isLValueReferenceType())
4704 VK = VK_LValue;
4705 else if (const auto *RRef = cv3T3->getAs<RValueReferenceType>())
4706 VK = RRef->getPointeeType()->isFunctionType() ? VK_LValue : VK_XValue;
4707 cv3T3 = cv3T3.getNonLValueExprType(S.Context);
4708
4709 // Add the user-defined conversion step.
4710 bool HadMultipleCandidates = (CandidateSet.size() > 1);
4711 Sequence.AddUserConversionStep(Function, Best->FoundDecl, cv3T3,
4712 HadMultipleCandidates);
4713
4714 // Determine whether we'll need to perform derived-to-base adjustments or
4715 // other conversions.
4716 Sema::ReferenceConversions RefConv;
4717 Sema::ReferenceCompareResult NewRefRelationship =
4718 S.CompareReferenceRelationship(DeclLoc, T1, cv3T3, &RefConv);
4719
4720 // Add the final conversion sequence, if necessary.
4721 if (NewRefRelationship == Sema::Ref_Incompatible) {
4722 assert(!isa<CXXConstructorDecl>(Function) &&(static_cast <bool> (!isa<CXXConstructorDecl>(Function
) && "should not have conversion after constructor") ?
void (0) : __assert_fail ("!isa<CXXConstructorDecl>(Function) && \"should not have conversion after constructor\""
, "clang/lib/Sema/SemaInit.cpp", 4723, __extension__ __PRETTY_FUNCTION__
))
4723 "should not have conversion after constructor")(static_cast <bool> (!isa<CXXConstructorDecl>(Function
) && "should not have conversion after constructor") ?
void (0) : __assert_fail ("!isa<CXXConstructorDecl>(Function) && \"should not have conversion after constructor\""
, "clang/lib/Sema/SemaInit.cpp", 4723, __extension__ __PRETTY_FUNCTION__
))
;
4724
4725 ImplicitConversionSequence ICS;
4726 ICS.setStandard();
4727 ICS.Standard = Best->FinalConversion;
4728 Sequence.AddConversionSequenceStep(ICS, ICS.Standard.getToType(2));
4729
4730 // Every implicit conversion results in a prvalue, except for a glvalue
4731 // derived-to-base conversion, which we handle below.
4732 cv3T3 = ICS.Standard.getToType(2);
4733 VK = VK_PRValue;
4734 }
4735
4736 // If the converted initializer is a prvalue, its type T4 is adjusted to
4737 // type "cv1 T4" and the temporary materialization conversion is applied.
4738 //
4739 // We adjust the cv-qualifications to match the reference regardless of
4740 // whether we have a prvalue so that the AST records the change. In this
4741 // case, T4 is "cv3 T3".
4742 QualType cv1T4 = S.Context.getQualifiedType(cv3T3, cv1T1.getQualifiers());
4743 if (cv1T4.getQualifiers() != cv3T3.getQualifiers())
4744 Sequence.AddQualificationConversionStep(cv1T4, VK);
4745 Sequence.AddReferenceBindingStep(cv1T4, VK == VK_PRValue);
4746 VK = IsLValueRef ? VK_LValue : VK_XValue;
4747
4748 if (RefConv & Sema::ReferenceConversions::DerivedToBase)
4749 Sequence.AddDerivedToBaseCastStep(cv1T1, VK);
4750 else if (RefConv & Sema::ReferenceConversions::ObjC)
4751 Sequence.AddObjCObjectConversionStep(cv1T1);
4752 else if (RefConv & Sema::ReferenceConversions::Function)
4753 Sequence.AddFunctionReferenceConversionStep(cv1T1);
4754 else if (RefConv & Sema::ReferenceConversions::Qualification) {
4755 if (!S.Context.hasSameType(cv1T4, cv1T1))
4756 Sequence.AddQualificationConversionStep(cv1T1, VK);
4757 }
4758
4759 return OR_Success;
4760}
4761
4762static void CheckCXX98CompatAccessibleCopy(Sema &S,
4763 const InitializedEntity &Entity,
4764 Expr *CurInitExpr);
4765
4766/// Attempt reference initialization (C++0x [dcl.init.ref])
4767static void TryReferenceInitialization(Sema &S,
4768 const InitializedEntity &Entity,
4769 const InitializationKind &Kind,
4770 Expr *Initializer,
4771 InitializationSequence &Sequence) {
4772 QualType DestType = Entity.getType();
4773 QualType cv1T1 = DestType->castAs<ReferenceType>()->getPointeeType();
4774 Qualifiers T1Quals;
4775 QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals);
4776 QualType cv2T2 = S.getCompletedType(Initializer);
4777 Qualifiers T2Quals;
4778 QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals);
4779
4780 // If the initializer is the address of an overloaded function, try
4781 // to resolve the overloaded function. If all goes well, T2 is the
4782 // type of the resulting function.
4783 if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2,
4784 T1, Sequence))
4785 return;
4786
4787 // Delegate everything else to a subfunction.
4788 TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1,
4789 T1Quals, cv2T2, T2, T2Quals, Sequence);
4790}
4791
4792/// Determine whether an expression is a non-referenceable glvalue (one to
4793/// which a reference can never bind). Attempting to bind a reference to
4794/// such a glvalue will always create a temporary.
4795static bool isNonReferenceableGLValue(Expr *E) {
4796 return E->refersToBitField() || E->refersToVectorElement() ||
4797 E->refersToMatrixElement();
4798}
4799
4800/// Reference initialization without resolving overloaded functions.
4801///
4802/// We also can get here in C if we call a builtin which is declared as
4803/// a function with a parameter of reference type (such as __builtin_va_end()).
4804static void TryReferenceInitializationCore(Sema &S,
4805 const InitializedEntity &Entity,
4806 const InitializationKind &Kind,
4807 Expr *Initializer,
4808 QualType cv1T1, QualType T1,
4809 Qualifiers T1Quals,
4810 QualType cv2T2, QualType T2,
4811 Qualifiers T2Quals,
4812 InitializationSequence &Sequence) {
4813 QualType DestType = Entity.getType();
4814 SourceLocation DeclLoc = Initializer->getBeginLoc();
4815
4816 // Compute some basic properties of the types and the initializer.
4817 bool isLValueRef = DestType->isLValueReferenceType();
4818 bool isRValueRef = !isLValueRef;
4819 Expr::Classification InitCategory = Initializer->Classify(S.Context);
4820
4821 Sema::ReferenceConversions RefConv;
4822 Sema::ReferenceCompareResult RefRelationship =
4823 S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2, &RefConv);
4824
4825 // C++0x [dcl.init.ref]p5:
4826 // A reference to type "cv1 T1" is initialized by an expression of type
4827 // "cv2 T2" as follows:
4828 //
4829 // - If the reference is an lvalue reference and the initializer
4830 // expression
4831 // Note the analogous bullet points for rvalue refs to functions. Because
4832 // there are no function rvalues in C++, rvalue refs to functions are treated
4833 // like lvalue refs.
4834 OverloadingResult ConvOvlResult = OR_Success;
4835 bool T1Function = T1->isFunctionType();
4836 if (isLValueRef || T1Function) {
4837 if (InitCategory.isLValue() && !isNonReferenceableGLValue(Initializer) &&
4838 (RefRelationship == Sema::Ref_Compatible ||
4839 (Kind.isCStyleOrFunctionalCast() &&
4840 RefRelationship == Sema::Ref_Related))) {
4841 // - is an lvalue (but is not a bit-field), and "cv1 T1" is
4842 // reference-compatible with "cv2 T2," or
4843 if (RefConv & (Sema::ReferenceConversions::DerivedToBase |
4844 Sema::ReferenceConversions::ObjC)) {
4845 // If we're converting the pointee, add any qualifiers first;
4846 // these qualifiers must all be top-level, so just convert to "cv1 T2".
4847 if (RefConv & (Sema::ReferenceConversions::Qualification))
4848 Sequence.AddQualificationConversionStep(
4849 S.Context.getQualifiedType(T2, T1Quals),
4850 Initializer->getValueKind());
4851 if (RefConv & Sema::ReferenceConversions::DerivedToBase)
4852 Sequence.AddDerivedToBaseCastStep(cv1T1, VK_LValue);
4853 else
4854 Sequence.AddObjCObjectConversionStep(cv1T1);
4855 } else if (RefConv & Sema::ReferenceConversions::Qualification) {
4856 // Perform a (possibly multi-level) qualification conversion.
4857 Sequence.AddQualificationConversionStep(cv1T1,
4858 Initializer->getValueKind());
4859 } else if (RefConv & Sema::ReferenceConversions::Function) {
4860 Sequence.AddFunctionReferenceConversionStep(cv1T1);
4861 }
4862
4863 // We only create a temporary here when binding a reference to a
4864 // bit-field or vector element. Those cases are't supposed to be
4865 // handled by this bullet, but the outcome is the same either way.
4866 Sequence.AddReferenceBindingStep(cv1T1, false);
4867 return;
4868 }
4869
4870 // - has a class type (i.e., T2 is a class type), where T1 is not
4871 // reference-related to T2, and can be implicitly converted to an
4872 // lvalue of type "cv3 T3," where "cv1 T1" is reference-compatible
4873 // with "cv3 T3" (this conversion is selected by enumerating the
4874 // applicable conversion functions (13.3.1.6) and choosing the best
4875 // one through overload resolution (13.3)),
4876 // If we have an rvalue ref to function type here, the rhs must be
4877 // an rvalue. DR1287 removed the "implicitly" here.
4878 if (RefRelationship == Sema::Ref_Incompatible && T2->isRecordType() &&
4879 (isLValueRef || InitCategory.isRValue())) {
4880 if (S.getLangOpts().CPlusPlus) {
4881 // Try conversion functions only for C++.
4882 ConvOvlResult = TryRefInitWithConversionFunction(
4883 S, Entity, Kind, Initializer, /*AllowRValues*/ isRValueRef,
4884 /*IsLValueRef*/ isLValueRef, Sequence);
4885 if (ConvOvlResult == OR_Success)
4886 return;
4887 if (ConvOvlResult != OR_No_Viable_Function)
4888 Sequence.SetOverloadFailure(
4889 InitializationSequence::FK_ReferenceInitOverloadFailed,
4890 ConvOvlResult);
4891 } else {
4892 ConvOvlResult = OR_No_Viable_Function;
4893 }
4894 }
4895 }
4896
4897 // - Otherwise, the reference shall be an lvalue reference to a
4898 // non-volatile const type (i.e., cv1 shall be const), or the reference
4899 // shall be an rvalue reference.
4900 // For address spaces, we interpret this to mean that an addr space
4901 // of a reference "cv1 T1" is a superset of addr space of "cv2 T2".
4902 if (isLValueRef && !(T1Quals.hasConst() && !T1Quals.hasVolatile() &&
4903 T1Quals.isAddressSpaceSupersetOf(T2Quals))) {
4904 if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy)
4905 Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
4906 else if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty())
4907 Sequence.SetOverloadFailure(
4908 InitializationSequence::FK_ReferenceInitOverloadFailed,
4909 ConvOvlResult);
4910 else if (!InitCategory.isLValue())
4911 Sequence.SetFailed(
4912 T1Quals.isAddressSpaceSupersetOf(T2Quals)
4913 ? InitializationSequence::
4914 FK_NonConstLValueReferenceBindingToTemporary
4915 : InitializationSequence::FK_ReferenceInitDropsQualifiers);
4916 else {
4917 InitializationSequence::FailureKind FK;
4918 switch (RefRelationship) {
4919 case Sema::Ref_Compatible:
4920 if (Initializer->refersToBitField())
4921 FK = InitializationSequence::
4922 FK_NonConstLValueReferenceBindingToBitfield;
4923 else if (Initializer->refersToVectorElement())
4924 FK = InitializationSequence::
4925 FK_NonConstLValueReferenceBindingToVectorElement;
4926 else if (Initializer->refersToMatrixElement())
4927 FK = InitializationSequence::
4928 FK_NonConstLValueReferenceBindingToMatrixElement;
4929 else
4930 llvm_unreachable("unexpected kind of compatible initializer")::llvm::llvm_unreachable_internal("unexpected kind of compatible initializer"
, "clang/lib/Sema/SemaInit.cpp", 4930)
;
4931 break;
4932 case Sema::Ref_Related:
4933 FK = InitializationSequence::FK_ReferenceInitDropsQualifiers;
4934 break;
4935 case Sema::Ref_Incompatible:
4936 FK = InitializationSequence::
4937 FK_NonConstLValueReferenceBindingToUnrelated;
4938 break;
4939 }
4940 Sequence.SetFailed(FK);
4941 }
4942 return;
4943 }
4944
4945 // - If the initializer expression
4946 // - is an
4947 // [<=14] xvalue (but not a bit-field), class prvalue, array prvalue, or
4948 // [1z] rvalue (but not a bit-field) or
4949 // function lvalue and "cv1 T1" is reference-compatible with "cv2 T2"
4950 //
4951 // Note: functions are handled above and below rather than here...
4952 if (!T1Function &&
4953 (RefRelationship == Sema::Ref_Compatible ||
4954 (Kind.isCStyleOrFunctionalCast() &&
4955 RefRelationship == Sema::Ref_Related)) &&
4956 ((InitCategory.isXValue() && !isNonReferenceableGLValue(Initializer)) ||
4957 (InitCategory.isPRValue() &&
4958 (S.getLangOpts().CPlusPlus17 || T2->isRecordType() ||
4959 T2->isArrayType())))) {
4960 ExprValueKind ValueKind = InitCategory.isXValue() ? VK_XValue : VK_PRValue;
4961 if (InitCategory.isPRValue() && T2->isRecordType()) {
4962 // The corresponding bullet in C++03 [dcl.init.ref]p5 gives the
4963 // compiler the freedom to perform a copy here or bind to the
4964 // object, while C++0x requires that we bind directly to the
4965 // object. Hence, we always bind to the object without making an
4966 // extra copy. However, in C++03 requires that we check for the
4967 // presence of a suitable copy constructor:
4968 //
4969 // The constructor that would be used to make the copy shall
4970 // be callable whether or not the copy is actually done.
4971 if (!S.getLangOpts().CPlusPlus11 && !S.getLangOpts().MicrosoftExt)
4972 Sequence.AddExtraneousCopyToTemporary(cv2T2);
4973 else if (S.getLangOpts().CPlusPlus11)
4974 CheckCXX98CompatAccessibleCopy(S, Entity, Initializer);
4975 }
4976
4977 // C++1z [dcl.init.ref]/5.2.1.2:
4978 // If the converted initializer is a prvalue, its type T4 is adjusted
4979 // to type "cv1 T4" and the temporary materialization conversion is
4980 // applied.
4981 // Postpone address space conversions to after the temporary materialization
4982 // conversion to allow creating temporaries in the alloca address space.
4983 auto T1QualsIgnoreAS = T1Quals;
4984 auto T2QualsIgnoreAS = T2Quals;
4985 if (T1Quals.getAddressSpace() != T2Quals.getAddressSpace()) {
4986 T1QualsIgnoreAS.removeAddressSpace();
4987 T2QualsIgnoreAS.removeAddressSpace();
4988 }
4989 QualType cv1T4 = S.Context.getQualifiedType(cv2T2, T1QualsIgnoreAS);
4990 if (T1QualsIgnoreAS != T2QualsIgnoreAS)
4991 Sequence.AddQualificationConversionStep(cv1T4, ValueKind);
4992 Sequence.AddReferenceBindingStep(cv1T4, ValueKind == VK_PRValue);
4993 ValueKind = isLValueRef ? VK_LValue : VK_XValue;
4994 // Add addr space conversion if required.
4995 if (T1Quals.getAddressSpace() != T2Quals.getAddressSpace()) {
4996 auto T4Quals = cv1T4.getQualifiers();
4997 T4Quals.addAddressSpace(T1Quals.getAddressSpace());
4998 QualType cv1T4WithAS = S.Context.getQualifiedType(T2, T4Quals);
4999 Sequence.AddQualificationConversionStep(cv1T4WithAS, ValueKind);
5000 cv1T4 = cv1T4WithAS;
5001 }
5002
5003 // In any case, the reference is bound to the resulting glvalue (or to
5004 // an appropriate base class subobject).
5005 if (RefConv & Sema::ReferenceConversions::DerivedToBase)
5006 Sequence.AddDerivedToBaseCastStep(cv1T1, ValueKind);
5007 else if (RefConv & Sema::ReferenceConversions::ObjC)
5008 Sequence.AddObjCObjectConversionStep(cv1T1);
5009 else if (RefConv & Sema::ReferenceConversions::Qualification) {
5010 if (!S.Context.hasSameType(cv1T4, cv1T1))
5011 Sequence.AddQualificationConversionStep(cv1T1, ValueKind);
5012 }
5013 return;
5014 }
5015
5016 // - has a class type (i.e., T2 is a class type), where T1 is not
5017 // reference-related to T2, and can be implicitly converted to an
5018 // xvalue, class prvalue, or function lvalue of type "cv3 T3",
5019 // where "cv1 T1" is reference-compatible with "cv3 T3",
5020 //
5021 // DR1287 removes the "implicitly" here.
5022 if (T2->isRecordType()) {
5023 if (RefRelationship == Sema::Ref_Incompatible) {
5024 ConvOvlResult = TryRefInitWithConversionFunction(
5025 S, Entity, Kind, Initializer, /*AllowRValues*/ true,
5026 /*IsLValueRef*/ isLValueRef, Sequence);
5027 if (ConvOvlResult)
5028 Sequence.SetOverloadFailure(
5029 InitializationSequence::FK_ReferenceInitOverloadFailed,
5030 ConvOvlResult);
5031
5032 return;
5033 }
5034
5035 if (RefRelationship == Sema::Ref_Compatible &&
5036 isRValueRef && InitCategory.isLValue()) {
5037 Sequence.SetFailed(
5038 InitializationSequence::FK_RValueReferenceBindingToLValue);
5039 return;
5040 }
5041
5042 Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
5043 return;
5044 }
5045
5046 // - Otherwise, a temporary of type "cv1 T1" is created and initialized
5047 // from the initializer expression using the rules for a non-reference
5048 // copy-initialization (8.5). The reference is then bound to the
5049 // temporary. [...]
5050
5051 // Ignore address space of reference type at this point and perform address
5052 // space conversion after the reference binding step.
5053 QualType cv1T1IgnoreAS =
5054 T1Quals.hasAddressSpace()
5055 ? S.Context.getQualifiedType(T1, T1Quals.withoutAddressSpace())
5056 : cv1T1;
5057
5058 InitializedEntity TempEntity =
5059 InitializedEntity::InitializeTemporary(cv1T1IgnoreAS);
5060
5061 // FIXME: Why do we use an implicit conversion here rather than trying
5062 // copy-initialization?
5063 ImplicitConversionSequence ICS
5064 = S.TryImplicitConversion(Initializer, TempEntity.getType(),
5065 /*SuppressUserConversions=*/false,
5066 Sema::AllowedExplicit::None,
5067 /*FIXME:InOverloadResolution=*/false,
5068 /*CStyle=*/Kind.isCStyleOrFunctionalCast(),
5069 /*AllowObjCWritebackConversion=*/false);
5070
5071 if (ICS.isBad()) {
5072 // FIXME: Use the conversion function set stored in ICS to turn
5073 // this into an overloading ambiguity diagnostic. However, we need
5074 // to keep that set as an OverloadCandidateSet rather than as some
5075 // other kind of set.
5076 if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty())
5077 Sequence.SetOverloadFailure(
5078 InitializationSequence::FK_ReferenceInitOverloadFailed,
5079 ConvOvlResult);
5080 else if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy)
5081 Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
5082 else
5083 Sequence.SetFailed(InitializationSequence::FK_ReferenceInitFailed);
5084 return;
5085 } else {
5086 Sequence.AddConversionSequenceStep(ICS, TempEntity.getType());
5087 }
5088
5089 // [...] If T1 is reference-related to T2, cv1 must be the
5090 // same cv-qualification as, or greater cv-qualification
5091 // than, cv2; otherwise, the program is ill-formed.
5092 unsigned T1CVRQuals = T1Quals.getCVRQualifiers();
5093 unsigned T2CVRQuals = T2Quals.getCVRQualifiers();
5094 if (RefRelationship == Sema::Ref_Related &&
5095 ((T1CVRQuals | T2CVRQuals) != T1CVRQuals ||
5096 !T1Quals.isAddressSpaceSupersetOf(T2Quals))) {
5097 Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
5098 return;
5099 }
5100
5101 // [...] If T1 is reference-related to T2 and the reference is an rvalue
5102 // reference, the initializer expression shall not be an lvalue.
5103 if (RefRelationship >= Sema::Ref_Related && !isLValueRef &&
5104 InitCategory.isLValue()) {
5105 Sequence.SetFailed(
5106 InitializationSequence::FK_RValueReferenceBindingToLValue);
5107 return;
5108 }
5109
5110 Sequence.AddReferenceBindingStep(cv1T1IgnoreAS, /*BindingTemporary=*/true);
5111
5112 if (T1Quals.hasAddressSpace()) {
5113 if (!Qualifiers::isAddressSpaceSupersetOf(T1Quals.getAddressSpace(),
5114 LangAS::Default)) {
5115 Sequence.SetFailed(
5116 InitializationSequence::FK_ReferenceAddrspaceMismatchTemporary);
5117 return;
5118 }
5119 Sequence.AddQualificationConversionStep(cv1T1, isLValueRef ? VK_LValue
5120 : VK_XValue);
5121 }
5122}
5123
5124/// Attempt character array initialization from a string literal
5125/// (C++ [dcl.init.string], C99 6.7.8).
5126static void TryStringLiteralInitialization(Sema &S,
5127 const InitializedEntity &Entity,
5128 const InitializationKind &Kind,
5129 Expr *Initializer,
5130 InitializationSequence &Sequence) {
5131 Sequence.AddStringInitStep(Entity.getType());
5132}
5133
5134/// Attempt value initialization (C++ [dcl.init]p7).
5135static void TryValueInitialization(Sema &S,
5136 const InitializedEntity &Entity,
5137 const InitializationKind &Kind,
5138 InitializationSequence &Sequence,
5139 InitListExpr *InitList) {
5140 assert((!InitList || InitList->getNumInits() == 0) &&(static_cast <bool> ((!InitList || InitList->getNumInits
() == 0) && "Shouldn't use value-init for non-empty init lists"
) ? void (0) : __assert_fail ("(!InitList || InitList->getNumInits() == 0) && \"Shouldn't use value-init for non-empty init lists\""
, "clang/lib/Sema/SemaInit.cpp", 5141, __extension__ __PRETTY_FUNCTION__
))
5141 "Shouldn't use value-init for non-empty init lists")(static_cast <bool> ((!InitList || InitList->getNumInits
() == 0) && "Shouldn't use value-init for non-empty init lists"
) ? void (0) : __assert_fail ("(!InitList || InitList->getNumInits() == 0) && \"Shouldn't use value-init for non-empty init lists\""
, "clang/lib/Sema/SemaInit.cpp", 5141, __extension__ __PRETTY_FUNCTION__
))
;
5142
5143 // C++98 [dcl.init]p5, C++11 [dcl.init]p7:
5144 //
5145 // To value-initialize an object of type T means:
5146 QualType T = Entity.getType();
5147
5148 // -- if T is an array type, then each element is value-initialized;
5149 T = S.Context.getBaseElementType(T);
5150
5151 if (const RecordType *RT = T->getAs<RecordType>()) {
5152 if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
5153 bool NeedZeroInitialization = true;
5154 // C++98:
5155 // -- if T is a class type (clause 9) with a user-declared constructor
5156 // (12.1), then the default constructor for T is called (and the
5157 // initialization is ill-formed if T has no accessible default
5158 // constructor);
5159 // C++11:
5160 // -- if T is a class type (clause 9) with either no default constructor
5161 // (12.1 [class.ctor]) or a default constructor that is user-provided
5162 // or deleted, then the object is default-initialized;
5163 //
5164 // Note that the C++11 rule is the same as the C++98 rule if there are no
5165 // defaulted or deleted constructors, so we just use it unconditionally.
5166 CXXConstructorDecl *CD = S.LookupDefaultConstructor(ClassDecl);
5167 if (!CD || !CD->getCanonicalDecl()->isDefaulted() || CD->isDeleted())
5168 NeedZeroInitialization = false;
5169
5170 // -- if T is a (possibly cv-qualified) non-union class type without a
5171 // user-provided or deleted default constructor, then the object is
5172 // zero-initialized and, if T has a non-trivial default constructor,
5173 // default-initialized;
5174 // The 'non-union' here was removed by DR1502. The 'non-trivial default
5175 // constructor' part was removed by DR1507.
5176 if (NeedZeroInitialization)
5177 Sequence.AddZeroInitializationStep(Entity.getType());
5178
5179 // C++03:
5180 // -- if T is a non-union class type without a user-declared constructor,
5181 // then every non-static data member and base class component of T is
5182 // value-initialized;
5183 // [...] A program that calls for [...] value-initialization of an
5184 // entity of reference type is ill-formed.
5185 //
5186 // C++11 doesn't need this handling, because value-initialization does not
5187 // occur recursively there, and the implicit default constructor is
5188 // defined as deleted in the problematic cases.
5189 if (!S.getLangOpts().CPlusPlus11 &&
5190 ClassDecl->hasUninitializedReferenceMember()) {
5191 Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForReference);
5192 return;
5193 }
5194
5195 // If this is list-value-initialization, pass the empty init list on when
5196 // building the constructor call. This affects the semantics of a few
5197 // things (such as whether an explicit default constructor can be called).
5198 Expr *InitListAsExpr = InitList;
5199 MultiExprArg Args(&InitListAsExpr, InitList ? 1 : 0);
5200 bool InitListSyntax = InitList;
5201
5202 // FIXME: Instead of creating a CXXConstructExpr of array type here,
5203 // wrap a class-typed CXXConstructExpr in an ArrayInitLoopExpr.
5204 return TryConstructorInitialization(
5205 S, Entity, Kind, Args, T, Entity.getType(), Sequence, InitListSyntax);
5206 }
5207 }
5208
5209 Sequence.AddZeroInitializationStep(Entity.getType());
5210}
5211
5212/// Attempt default initialization (C++ [dcl.init]p6).
5213static void TryDefaultInitialization(Sema &S,
5214 const InitializedEntity &Entity,
5215 const InitializationKind &Kind,
5216 InitializationSequence &Sequence) {
5217 assert(Kind.getKind() == InitializationKind::IK_Default)(static_cast <bool> (Kind.getKind() == InitializationKind
::IK_Default) ? void (0) : __assert_fail ("Kind.getKind() == InitializationKind::IK_Default"
, "clang/lib/Sema/SemaInit.cpp", 5217, __extension__ __PRETTY_FUNCTION__
))
;
5218
5219 // C++ [dcl.init]p6:
5220 // To default-initialize an object of type T means:
5221 // - if T is an array type, each element is default-initialized;
5222 QualType DestType = S.Context.getBaseElementType(Entity.getType());
5223
5224 // - if T is a (possibly cv-qualified) class type (Clause 9), the default
5225 // constructor for T is called (and the initialization is ill-formed if
5226 // T has no accessible default constructor);
5227 if (DestType->isRecordType() && S.getLangOpts().CPlusPlus) {
5228 TryConstructorInitialization(S, Entity, Kind, None, DestType,
5229 Entity.getType(), Sequence);
5230 return;
5231 }
5232
5233 // - otherwise, no initialization is performed.
5234
5235 // If a program calls for the default initialization of an object of
5236 // a const-qualified type T, T shall be a class type with a user-provided
5237 // default constructor.
5238 if (DestType.isConstQualified() && S.getLangOpts().CPlusPlus) {
5239 if (!maybeRecoverWithZeroInitialization(S, Sequence, Entity))
5240 Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst);
5241 return;
5242 }
5243
5244 // If the destination type has a lifetime property, zero-initialize it.
5245 if (DestType.getQualifiers().hasObjCLifetime()) {
5246 Sequence.AddZeroInitializationStep(Entity.getType());
5247 return;
5248 }
5249}
5250
5251/// Attempt a user-defined conversion between two types (C++ [dcl.init]),
5252/// which enumerates all conversion functions and performs overload resolution
5253/// to select the best.
5254static void TryUserDefinedConversion(Sema &S,
5255 QualType DestType,
5256 const InitializationKind &Kind,
5257 Expr *Initializer,
5258 InitializationSequence &Sequence,
5259 bool TopLevelOfInitList) {
5260 assert(!DestType->isReferenceType() && "References are handled elsewhere")(static_cast <bool> (!DestType->isReferenceType() &&
"References are handled elsewhere") ? void (0) : __assert_fail
("!DestType->isReferenceType() && \"References are handled elsewhere\""
, "clang/lib/Sema/SemaInit.cpp", 5260, __extension__ __PRETTY_FUNCTION__
))
;
5261 QualType SourceType = Initializer->getType();
5262 assert((DestType->isRecordType() || SourceType->isRecordType()) &&(static_cast <bool> ((DestType->isRecordType() || SourceType
->isRecordType()) && "Must have a class type to perform a user-defined conversion"
) ? void (0) : __assert_fail ("(DestType->isRecordType() || SourceType->isRecordType()) && \"Must have a class type to perform a user-defined conversion\""
, "clang/lib/Sema/SemaInit.cpp", 5263, __extension__ __PRETTY_FUNCTION__
))
5263 "Must have a class type to perform a user-defined conversion")(static_cast <bool> ((DestType->isRecordType() || SourceType
->isRecordType()) && "Must have a class type to perform a user-defined conversion"
) ? void (0) : __assert_fail ("(DestType->isRecordType() || SourceType->isRecordType()) && \"Must have a class type to perform a user-defined conversion\""
, "clang/lib/Sema/SemaInit.cpp", 5263, __extension__ __PRETTY_FUNCTION__
))
;
5264
5265 // Build the candidate set directly in the initialization sequence
5266 // structure, so that it will persist if we fail.
5267 OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
5268 CandidateSet.clear(OverloadCandidateSet::CSK_InitByUserDefinedConversion);
5269 CandidateSet.setDestAS(DestType.getQualifiers().getAddressSpace());
5270
5271 // Determine whether we are allowed to call explicit constructors or
5272 // explicit conversion operators.
5273 bool AllowExplicit = Kind.AllowExplicit();
5274
5275 if (const RecordType *DestRecordType = DestType->getAs<RecordType>()) {
5276 // The type we're converting to is a class type. Enumerate its constructors
5277 // to see if there is a suitable conversion.
5278 CXXRecordDecl *DestRecordDecl
5279 = cast<CXXRecordDecl>(DestRecordType->getDecl());
5280
5281 // Try to complete the type we're converting to.
5282 if (S.isCompleteType(Kind.getLocation(), DestType)) {
5283 for (NamedDecl *D : S.LookupConstructors(DestRecordDecl)) {
5284 auto Info = getConstructorInfo(D);
5285 if (!Info.Constructor)
5286 continue;
5287
5288 if (!Info.Constructor->isInvalidDecl() &&
5289 Info.Constructor->isConvertingConstructor(/*AllowExplicit*/true)) {
5290 if (Info.ConstructorTmpl)
5291 S.AddTemplateOverloadCandidate(
5292 Info.ConstructorTmpl, Info.FoundDecl,
5293 /*ExplicitArgs*/ nullptr, Initializer, CandidateSet,
5294 /*SuppressUserConversions=*/true,
5295 /*PartialOverloading*/ false, AllowExplicit);
5296 else
5297 S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl,
5298 Initializer, CandidateSet,
5299 /*SuppressUserConversions=*/true,
5300 /*PartialOverloading*/ false, AllowExplicit);
5301 }
5302 }
5303 }
5304 }
5305
5306 SourceLocation DeclLoc = Initializer->getBeginLoc();
5307
5308 if (const RecordType *SourceRecordType = SourceType->getAs<RecordType>()) {
5309 // The type we're converting from is a class type, enumerate its conversion
5310 // functions.
5311
5312 // We can only enumerate the conversion functions for a complete type; if
5313 // the type isn't complete, simply skip this step.
5314 if (S.isCompleteType(DeclLoc, SourceType)) {
5315 CXXRecordDecl *SourceRecordDecl
5316 = cast<CXXRecordDecl>(SourceRecordType->getDecl());
5317
5318 const auto &Conversions =
5319 SourceRecordDecl->getVisibleConversionFunctions();
5320 for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) {
5321 NamedDecl *D = *I;
5322 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
5323 if (isa<UsingShadowDecl>(D))
5324 D = cast<UsingShadowDecl>(D)->getTargetDecl();
5325
5326 FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
5327 CXXConversionDecl *Conv;
5328 if (ConvTemplate)
5329 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
5330 else
5331 Conv = cast<CXXConversionDecl>(D);
5332
5333 if (ConvTemplate)
5334 S.AddTemplateConversionCandidate(
5335 ConvTemplate, I.getPair(), ActingDC, Initializer, DestType,
5336 CandidateSet, AllowExplicit, AllowExplicit);
5337 else
5338 S.AddConversionCandidate(Conv, I.getPair(), ActingDC, Initializer,
5339 DestType, CandidateSet, AllowExplicit,
5340 AllowExplicit);
5341 }
5342 }
5343 }
5344
5345 // Perform overload resolution. If it fails, return the failed result.
5346 OverloadCandidateSet::iterator Best;
5347 if (OverloadingResult Result
5348 = CandidateSet.BestViableFunction(S, DeclLoc, Best)) {
5349 Sequence.SetOverloadFailure(
5350 InitializationSequence::FK_UserConversionOverloadFailed, Result);
5351
5352 // [class.copy.elision]p3:
5353 // In some copy-initialization contexts, a two-stage overload resolution
5354 // is performed.
5355 // If the first overload resolution selects a deleted function, we also
5356 // need the initialization sequence to decide whether to perform the second
5357 // overload resolution.
5358 if (!(Result == OR_Deleted &&
5359 Kind.getKind() == InitializationKind::IK_Copy))
5360 return;
5361 }
5362
5363 FunctionDecl *Function = Best->Function;
5364 Function->setReferenced();
5365 bool HadMultipleCandidates = (CandidateSet.size() > 1);
5366
5367 if (isa<CXXConstructorDecl>(Function)) {
5368 // Add the user-defined conversion step. Any cv-qualification conversion is
5369 // subsumed by the initialization. Per DR5, the created temporary is of the
5370 // cv-unqualified type of the destination.
5371 Sequence.AddUserConversionStep(Function, Best->FoundDecl,
5372 DestType.getUnqualifiedType(),
5373 HadMultipleCandidates);
5374
5375 // C++14 and before:
5376 // - if the function is a constructor, the call initializes a temporary
5377 // of the cv-unqualified version of the destination type. The [...]
5378 // temporary [...] is then used to direct-initialize, according to the
5379 // rules above, the object that is the destination of the
5380 // copy-initialization.
5381 // Note that this just performs a simple object copy from the temporary.
5382 //
5383 // C++17:
5384 // - if the function is a constructor, the call is a prvalue of the
5385 // cv-unqualified version of the destination type whose return object
5386 // is initialized by the constructor. The call is used to
5387 // direct-initialize, according to the rules above, the object that
5388 // is the destination of the copy-initialization.
5389 // Therefore we need to do nothing further.
5390 //
5391 // FIXME: Mark this copy as extraneous.
5392 if (!S.getLangOpts().CPlusPlus17)
5393 Sequence.AddFinalCopy(DestType);
5394 else if (DestType.hasQualifiers())
5395 Sequence.AddQualificationConversionStep(DestType, VK_PRValue);
5396 return;
5397 }
5398
5399 // Add the user-defined conversion step that calls the conversion function.
5400 QualType ConvType = Function->getCallResultType();
5401 Sequence.AddUserConversionStep(Function, Best->FoundDecl, ConvType,
5402 HadMultipleCandidates);
5403
5404 if (ConvType->getAs<RecordType>()) {
5405 // The call is used to direct-initialize [...] the object that is the
5406 // destination of the copy-initialization.
5407 //
5408 // In C++17, this does not call a constructor if we enter /17.6.1:
5409 // - If the initializer expression is a prvalue and the cv-unqualified
5410 // version of the source type is the same as the class of the
5411 // destination [... do not make an extra copy]
5412 //
5413 // FIXME: Mark this copy as extraneous.
5414 if (!S.getLangOpts().CPlusPlus17 ||
5415 Function->getReturnType()->isReferenceType() ||
5416 !S.Context.hasSameUnqualifiedType(ConvType, DestType))
5417 Sequence.AddFinalCopy(DestType);
5418 else if (!S.Context.hasSameType(ConvType, DestType))
5419 Sequence.AddQualificationConversionStep(DestType, VK_PRValue);
5420 return;
5421 }
5422
5423 // If the conversion following the call to the conversion function
5424 // is interesting, add it as a separate step.
5425 if (Best->FinalConversion.First || Best->FinalConversion.Second ||
5426 Best->FinalConversion.Third) {
5427 ImplicitConversionSequence ICS;
5428 ICS.setStandard();
5429 ICS.Standard = Best->FinalConversion;
5430 Sequence.AddConversionSequenceStep(ICS, DestType, TopLevelOfInitList);
5431 }
5432}
5433
5434/// An egregious hack for compatibility with libstdc++-4.2: in <tr1/hashtable>,
5435/// a function with a pointer return type contains a 'return false;' statement.
5436/// In C++11, 'false' is not a null pointer, so this breaks the build of any
5437/// code using that header.
5438///
5439/// Work around this by treating 'return false;' as zero-initializing the result
5440/// if it's used in a pointer-returning function in a system header.
5441static bool isLibstdcxxPointerReturnFalseHack(Sema &S,
5442 const InitializedEntity &Entity,
5443 const Expr *Init) {
5444 return S.getLangOpts().CPlusPlus11 &&
5445 Entity.getKind() == InitializedEntity::EK_Result &&
5446 Entity.getType()->isPointerType() &&
5447 isa<CXXBoolLiteralExpr>(Init) &&
5448 !cast<CXXBoolLiteralExpr>(Init)->getValue() &&
5449 S.getSourceManager().isInSystemHeader(Init->getExprLoc());
5450}
5451
5452/// The non-zero enum values here are indexes into diagnostic alternatives.
5453enum InvalidICRKind { IIK_okay, IIK_nonlocal, IIK_nonscalar };
5454
5455/// Determines whether this expression is an acceptable ICR source.
5456static InvalidICRKind isInvalidICRSource(ASTContext &C, Expr *e,
5457 bool isAddressOf, bool &isWeakAccess) {
5458 // Skip parens.
5459 e = e->IgnoreParens();
5460
5461 // Skip address-of nodes.
5462 if (UnaryOperator *op = dyn_cast<UnaryOperator>(e)) {
5463 if (op->getOpcode() == UO_AddrOf)
5464 return isInvalidICRSource(C, op->getSubExpr(), /*addressof*/ true,
5465 isWeakAccess);
5466
5467 // Skip certain casts.
5468 } else if (CastExpr *ce = dyn_cast<CastExpr>(e)) {
5469 switch (ce->getCastKind()) {
5470 case CK_Dependent:
5471 case CK_BitCast:
5472 case CK_LValueBitCast:
5473 case CK_NoOp:
5474 return isInvalidICRSource(C, ce->getSubExpr(), isAddressOf, isWeakAccess);
5475
5476 case CK_ArrayToPointerDecay:
5477 return IIK_nonscalar;
5478
5479 case CK_NullToPointer:
5480 return IIK_okay;
5481
5482 default:
5483 break;
5484 }
5485
5486 // If we have a declaration reference, it had better be a local variable.
5487 } else if (isa<DeclRefExpr>(e)) {
5488 // set isWeakAccess to true, to mean that there will be an implicit
5489 // load which requires a cleanup.
5490 if (e->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
5491 isWeakAccess = true;
5492
5493 if (!isAddressOf) return IIK_nonlocal;
5494
5495 VarDecl *var = dyn_cast<VarDecl>(cast<DeclRefExpr>(e)->getDecl());
5496 if (!var) return IIK_nonlocal;
5497
5498 return (var->hasLocalStorage() ? IIK_okay : IIK_nonlocal);
5499
5500 // If we have a conditional operator, check both sides.
5501 } else if (ConditionalOperator *cond = dyn_cast<ConditionalOperator>(e)) {
5502 if (InvalidICRKind iik = isInvalidICRSource(C, cond->getLHS(), isAddressOf,
5503 isWeakAccess))
5504 return iik;
5505
5506 return isInvalidICRSource(C, cond->getRHS(), isAddressOf, isWeakAccess);
5507
5508 // These are never scalar.
5509 } else if (isa<ArraySubscriptExpr>(e)) {
5510 return IIK_nonscalar;
5511
5512 // Otherwise, it needs to be a null pointer constant.
5513 } else {
5514 return (e->isNullPointerConstant(C, Expr::NPC_ValueDependentIsNull)
5515 ? IIK_okay : IIK_nonlocal);
5516 }
5517
5518 return IIK_nonlocal;
5519}
5520
5521/// Check whether the given expression is a valid operand for an
5522/// indirect copy/restore.
5523static void checkIndirectCopyRestoreSource(Sema &S, Expr *src) {
5524 assert(src->isPRValue())(static_cast <bool> (src->isPRValue()) ? void (0) : __assert_fail
("src->isPRValue()", "clang/lib/Sema/SemaInit.cpp", 5524,
__extension__ __PRETTY_FUNCTION__))
;
5525 bool isWeakAccess = false;
5526 InvalidICRKind iik = isInvalidICRSource(S.Context, src, false, isWeakAccess);
5527 // If isWeakAccess to true, there will be an implicit
5528 // load which requires a cleanup.
5529 if (S.getLangOpts().ObjCAutoRefCount && isWeakAccess)
5530 S.Cleanup.setExprNeedsCleanups(true);
5531
5532 if (iik == IIK_okay) return;
5533
5534 S.Diag(src->getExprLoc(), diag::err_arc_nonlocal_writeback)
5535 << ((unsigned) iik - 1) // shift index into diagnostic explanations
5536 << src->getSourceRange();
5537}
5538
5539/// Determine whether we have compatible array types for the
5540/// purposes of GNU by-copy array initialization.
5541static bool hasCompatibleArrayTypes(ASTContext &Context, const ArrayType *Dest,
5542 const ArrayType *Source) {
5543 // If the source and destination array types are equivalent, we're
5544 // done.
5545 if (Context.hasSameType(QualType(Dest, 0), QualType(Source, 0)))
5546 return true;
5547
5548 // Make sure that the element types are the same.
5549 if (!Context.hasSameType(Dest->getElementType(), Source->getElementType()))
5550 return false;
5551
5552 // The only mismatch we allow is when the destination is an
5553 // incomplete array type and the source is a constant array type.
5554 return Source->isConstantArrayType() && Dest->isIncompleteArrayType();
5555}
5556
5557static bool tryObjCWritebackConversion(Sema &S,
5558 InitializationSequence &Sequence,
5559 const InitializedEntity &Entity,
5560 Expr *Initializer) {
5561 bool ArrayDecay = false;
5562 QualType ArgType = Initializer->getType();
5563 QualType ArgPointee;
5564 if (const ArrayType *ArgArrayType = S.Context.getAsArrayType(ArgType)) {
5565 ArrayDecay = true;
5566 ArgPointee = ArgArrayType->getElementType();
5567 ArgType = S.Context.getPointerType(ArgPointee);
5568 }
5569
5570 // Handle write-back conversion.
5571 QualType ConvertedArgType;
5572 if (!S.isObjCWritebackConversion(ArgType, Entity.getType(),
5573 ConvertedArgType))
5574 return false;
5575
5576 // We should copy unless we're passing to an argument explicitly
5577 // marked 'out'.
5578 bool ShouldCopy = true;
5579 if (ParmVarDecl *param = cast_or_null<ParmVarDecl>(Entity.getDecl()))
5580 ShouldCopy = (param->getObjCDeclQualifier() != ParmVarDecl::OBJC_TQ_Out);
5581
5582 // Do we need an lvalue conversion?
5583 if (ArrayDecay || Initializer->isGLValue()) {
5584 ImplicitConversionSequence ICS;
5585 ICS.setStandard();
5586 ICS.Standard.setAsIdentityConversion();
5587
5588 QualType ResultType;
5589 if (ArrayDecay) {
5590 ICS.Standard.First = ICK_Array_To_Pointer;
5591 ResultType = S.Context.getPointerType(ArgPointee);
5592 } else {
5593 ICS.Standard.First = ICK_Lvalue_To_Rvalue;
5594 ResultType = Initializer->getType().getNonLValueExprType(S.Context);
5595 }
5596
5597 Sequence.AddConversionSequenceStep(ICS, ResultType);
5598 }
5599
5600 Sequence.AddPassByIndirectCopyRestoreStep(Entity.getType(), ShouldCopy);
5601 return true;
5602}
5603
5604static bool TryOCLSamplerInitialization(Sema &S,
5605 InitializationSequence &Sequence,
5606 QualType DestType,
5607 Expr *Initializer) {
5608 if (!S.getLangOpts().OpenCL || !DestType->isSamplerT() ||
5609 (!Initializer->isIntegerConstantExpr(S.Context) &&
5610 !Initializer->getType()->isSamplerT()))
5611 return false;
5612
5613 Sequence.AddOCLSamplerInitStep(DestType);
5614 return true;
5615}
5616
5617static bool IsZeroInitializer(Expr *Initializer, Sema &S) {
5618 return Initializer->isIntegerConstantExpr(S.getASTContext()) &&
5619 (Initializer->EvaluateKnownConstInt(S.getASTContext()) == 0);
5620}
5621
5622static bool TryOCLZeroOpaqueTypeInitialization(Sema &S,
5623 InitializationSequence &Sequence,
5624 QualType DestType,
5625 Expr *Initializer) {
5626 if (!S.getLangOpts().OpenCL)
5627 return false;
5628
5629 //
5630 // OpenCL 1.2 spec, s6.12.10
5631 //
5632 // The event argument can also be used to associate the
5633 // async_work_group_copy with a previous async copy allowing
5634 // an event to be shared by multiple async copies; otherwise
5635 // event should be zero.
5636 //
5637 if (DestType->isEventT() || DestType->isQueueT()) {
5638 if (!IsZeroInitializer(Initializer, S))
5639 return false;
5640
5641 Sequence.AddOCLZeroOpaqueTypeStep(DestType);
5642 return true;
5643 }
5644
5645 // We should allow zero initialization for all types defined in the
5646 // cl_intel_device_side_avc_motion_estimation extension, except
5647 // intel_sub_group_avc_mce_payload_t and intel_sub_group_avc_mce_result_t.
5648 if (S.getOpenCLOptions().isAvailableOption(
5649 "cl_intel_device_side_avc_motion_estimation", S.getLangOpts()) &&
5650 DestType->isOCLIntelSubgroupAVCType()) {
5651 if (DestType->isOCLIntelSubgroupAVCMcePayloadType() ||
5652 DestType->isOCLIntelSubgroupAVCMceResultType())
5653 return false;
5654 if (!IsZeroInitializer(Initializer, S))
5655 return false;
5656
5657 Sequence.AddOCLZeroOpaqueTypeStep(DestType);
5658 return true;
5659 }
5660
5661 return false;
5662}
5663
5664InitializationSequence::InitializationSequence(
5665 Sema &S, const InitializedEntity &Entity, const InitializationKind &Kind,
5666 MultiExprArg Args, bool TopLevelOfInitList, bool TreatUnavailableAsInvalid)
5667 : FailedOverloadResult(OR_Success),
5668 FailedCandidateSet(Kind.getLocation(), OverloadCandidateSet::CSK_Normal) {
5669 InitializeFrom(S, Entity, Kind, Args, TopLevelOfInitList,
5670 TreatUnavailableAsInvalid);
5671}
5672
5673/// Tries to get a FunctionDecl out of `E`. If it succeeds and we can take the
5674/// address of that function, this returns true. Otherwise, it returns false.
5675static bool isExprAnUnaddressableFunction(Sema &S, const Expr *E) {
5676 auto *DRE = dyn_cast<DeclRefExpr>(E);
5677 if (!DRE || !isa<FunctionDecl>(DRE->getDecl()))
5678 return false;
5679
5680 return !S.checkAddressOfFunctionIsAvailable(
5681 cast<FunctionDecl>(DRE->getDecl()));
5682}
5683
5684/// Determine whether we can perform an elementwise array copy for this kind
5685/// of entity.
5686static bool canPerformArrayCopy(const InitializedEntity &Entity) {
5687 switch (Entity.getKind()) {
5688 case InitializedEntity::EK_LambdaCapture:
5689 // C++ [expr.prim.lambda]p24:
5690 // For array members, the array elements are direct-initialized in
5691 // increasing subscript order.
5692 return true;
5693
5694 case InitializedEntity::EK_Variable:
5695 // C++ [dcl.decomp]p1:
5696 // [...] each element is copy-initialized or direct-initialized from the
5697 // corresponding element of the assignment-expression [...]
5698 return isa<DecompositionDecl>(Entity.getDecl());
5699
5700 case InitializedEntity::EK_Member:
5701 // C++ [class.copy.ctor]p14:
5702 // - if the member is an array, each element is direct-initialized with
5703 // the corresponding subobject of x
5704 return Entity.isImplicitMemberInitializer();
5705
5706 case InitializedEntity::EK_ArrayElement:
5707 // All the above cases are intended to apply recursively, even though none
5708 // of them actually say that.
5709 if (auto *E = Entity.getParent())
5710 return canPerformArrayCopy(*E);
5711 break;
5712
5713 default:
5714 break;
5715 }
5716
5717 return false;
5718}
5719
5720void InitializationSequence::InitializeFrom(Sema &S,
5721 const InitializedEntity &Entity,
5722 const InitializationKind &Kind,
5723 MultiExprArg Args,
5724 bool TopLevelOfInitList,
5725 bool TreatUnavailableAsInvalid) {
5726 ASTContext &Context = S.Context;
5727
5728 // Eliminate non-overload placeholder types in the arguments. We
5729 // need to do this before checking whether types are dependent
5730 // because lowering a pseudo-object expression might well give us
5731 // something of dependent type.
5732 for (unsigned I = 0, E = Args.size(); I != E; ++I)
5733 if (Args[I]->getType()->isNonOverloadPlaceholderType()) {
5734 // FIXME: should we be doing this here?
5735 ExprResult result = S.CheckPlaceholderExpr(Args[I]);
5736 if (result.isInvalid()) {
5737 SetFailed(FK_PlaceholderType);
5738 return;
5739 }
5740 Args[I] = result.get();
5741 }
5742
5743 // C++0x [dcl.init]p16:
5744 // The semantics of initializers are as follows. The destination type is
5745 // the type of the object or reference being initialized and the source
5746 // type is the type of the initializer expression. The source type is not
5747 // defined when the initializer is a braced-init-list or when it is a
5748 // parenthesized list of expressions.
5749 QualType DestType = Entity.getType();
5750
5751 if (DestType->isDependentType() ||
5752 Expr::hasAnyTypeDependentArguments(Args)) {
5753 SequenceKind = DependentSequence;
5754 return;
5755 }
5756
5757 // Almost everything is a normal sequence.
5758 setSequenceKind(NormalSequence);
5759
5760 QualType SourceType;
5761 Expr *Initializer = nullptr;
5762 if (Args.size() == 1) {
5763 Initializer = Args[0];
5764 if (S.getLangOpts().ObjC) {
5765 if (S.CheckObjCBridgeRelatedConversions(Initializer->getBeginLoc(),
5766 DestType, Initializer->getType(),
5767 Initializer) ||
5768 S.CheckConversionToObjCLiteral(DestType, Initializer))
5769 Args[0] = Initializer;
5770 }
5771 if (!isa<InitListExpr>(Initializer))
5772 SourceType = Initializer->getType();
5773 }
5774
5775 // - If the initializer is a (non-parenthesized) braced-init-list, the
5776 // object is list-initialized (8.5.4).
5777 if (Kind.getKind() != InitializationKind::IK_Direct) {
5778 if (InitListExpr *InitList = dyn_cast_or_null<InitListExpr>(Initializer)) {
5779 TryListInitialization(S, Entity, Kind, InitList, *this,
5780 TreatUnavailableAsInvalid);
5781 return;
5782 }
5783 }
5784
5785 // - If the destination type is a reference type, see 8.5.3.
5786 if (DestType->isReferenceType()) {
5787 // C++0x [dcl.init.ref]p1:
5788 // A variable declared to be a T& or T&&, that is, "reference to type T"
5789 // (8.3.2), shall be initialized by an object, or function, of type T or
5790 // by an object that can be converted into a T.
5791 // (Therefore, multiple arguments are not permitted.)
5792 if (Args.size() != 1)
5793 SetFailed(FK_TooManyInitsForReference);
5794 // C++17 [dcl.init.ref]p5:
5795 // A reference [...] is initialized by an expression [...] as follows:
5796 // If the initializer is not an expression, presumably we should reject,
5797 // but the standard fails to actually say so.
5798 else if (isa<InitListExpr>(Args[0]))
5799 SetFailed(FK_ParenthesizedListInitForReference);
5800 else
5801 TryReferenceInitialization(S, Entity, Kind, Args[0], *this);
5802 return;
5803 }
5804
5805 // - If the initializer is (), the object is value-initialized.
5806 if (Kind.getKind() == InitializationKind::IK_Value ||
5807 (Kind.getKind() == InitializationKind::IK_Direct && Args.empty())) {
5808 TryValueInitialization(S, Entity, Kind, *this);
5809 return;
5810 }
5811
5812 // Handle default initialization.
5813 if (Kind.getKind() == InitializationKind::IK_Default) {
5814 TryDefaultInitialization(S, Entity, Kind, *this);
5815 return;
5816 }
5817
5818 // - If the destination type is an array of characters, an array of
5819 // char16_t, an array of char32_t, or an array of wchar_t, and the
5820 // initializer is a string literal, see 8.5.2.
5821 // - Otherwise, if the destination type is an array, the program is
5822 // ill-formed.
5823 if (const ArrayType *DestAT = Context.getAsArrayType(DestType)) {
5824 if (Initializer && isa<VariableArrayType>(DestAT)) {
5825 SetFailed(FK_VariableLengthArrayHasInitializer);
5826 return;
5827 }
5828
5829 if (Initializer) {
5830 switch (IsStringInit(Initializer, DestAT, Context)) {
5831 case SIF_None:
5832 TryStringLiteralInitialization(S, Entity, Kind, Initializer, *this);
5833 return;
5834 case SIF_NarrowStringIntoWideChar:
5835 SetFailed(FK_NarrowStringIntoWideCharArray);
5836 return;
5837 case SIF_WideStringIntoChar:
5838 SetFailed(FK_WideStringIntoCharArray);
5839 return;
5840 case SIF_IncompatWideStringIntoWideChar:
5841 SetFailed(FK_IncompatWideStringIntoWideChar);
5842 return;
5843 case SIF_PlainStringIntoUTF8Char:
5844 SetFailed(FK_PlainStringIntoUTF8Char);
5845 return;
5846 case SIF_UTF8StringIntoPlainChar:
5847 SetFailed(FK_UTF8StringIntoPlainChar);
5848 return;
5849 case SIF_Other:
5850 break;
5851 }
5852 }
5853
5854 // Some kinds of initialization permit an array to be initialized from
5855 // another array of the same type, and perform elementwise initialization.
5856 if (Initializer && isa<ConstantArrayType>(DestAT) &&
5857 S.Context.hasSameUnqualifiedType(Initializer->getType(),
5858 Entity.getType()) &&
5859 canPerformArrayCopy(Entity)) {
5860 // If source is a prvalue, use it directly.
5861 if (Initializer->isPRValue()) {
5862 AddArrayInitStep(DestType, /*IsGNUExtension*/false);
5863 return;
5864 }
5865
5866 // Emit element-at-a-time copy loop.
5867 InitializedEntity Element =
5868 InitializedEntity::InitializeElement(S.Context, 0, Entity);
5869 QualType InitEltT =
5870 Context.getAsArrayType(Initializer->getType())->getElementType();
5871 OpaqueValueExpr OVE(Initializer->getExprLoc(), InitEltT,
5872 Initializer->getValueKind(),
5873 Initializer->getObjectKind());
5874 Expr *OVEAsExpr = &OVE;
5875 InitializeFrom(S, Element, Kind, OVEAsExpr, TopLevelOfInitList,
5876 TreatUnavailableAsInvalid);
5877 if (!Failed())
5878 AddArrayInitLoopStep(Entity.getType(), InitEltT);
5879 return;
5880 }
5881
5882 // Note: as an GNU C extension, we allow initialization of an
5883 // array from a compound literal that creates an array of the same
5884 // type, so long as the initializer has no side effects.
5885 if (!S.getLangOpts().CPlusPlus && Initializer &&
5886 isa<CompoundLiteralExpr>(Initializer->IgnoreParens()) &&
5887 Initializer->getType()->isArrayType()) {
5888 const ArrayType *SourceAT
5889 = Context.getAsArrayType(Initializer->getType());
5890 if (!hasCompatibleArrayTypes(S.Context, DestAT, SourceAT))
5891 SetFailed(FK_ArrayTypeMismatch);
5892 else if (Initializer->HasSideEffects(S.Context))
5893 SetFailed(FK_NonConstantArrayInit);
5894 else {
5895 AddArrayInitStep(DestType, /*IsGNUExtension*/true);
5896 }
5897 }
5898 // Note: as a GNU C++ extension, we allow list-initialization of a
5899 // class member of array type from a parenthesized initializer list.
5900 else if (S.getLangOpts().CPlusPlus &&
5901 Entity.getKind() == InitializedEntity::EK_Member &&
5902 Initializer && isa<InitListExpr>(Initializer)) {
5903 TryListInitialization(S, Entity, Kind, cast<InitListExpr>(Initializer),
5904 *this, TreatUnavailableAsInvalid);
5905 AddParenthesizedArrayInitStep(DestType);
5906 } else if (DestAT->getElementType()->isCharType())
5907 SetFailed(FK_ArrayNeedsInitListOrStringLiteral);
5908 else if (IsWideCharCompatible(DestAT->getElementType(), Context))
5909 SetFailed(FK_ArrayNeedsInitListOrWideStringLiteral);
5910 else
5911 SetFailed(FK_ArrayNeedsInitList);
5912
5913 return;
5914 }
5915
5916 // Determine whether we should consider writeback conversions for
5917 // Objective-C ARC.
5918 bool allowObjCWritebackConversion = S.getLangOpts().ObjCAutoRefCount &&
5919 Entity.isParameterKind();
5920
5921 if (TryOCLSamplerInitialization(S, *this, DestType, Initializer))
5922 return;
5923
5924 // We're at the end of the line for C: it's either a write-back conversion
5925 // or it's a C assignment. There's no need to check anything else.
5926 if (!S.getLangOpts().CPlusPlus) {
5927 // If allowed, check whether this is an Objective-C writeback conversion.
5928 if (allowObjCWritebackConversion &&
5929 tryObjCWritebackConversion(S, *this, Entity, Initializer)) {
5930 return;
5931 }
5932
5933 if (TryOCLZeroOpaqueTypeInitialization(S, *this, DestType, Initializer))
5934 return;
5935
5936 // Handle initialization in C
5937 AddCAssignmentStep(DestType);
5938 MaybeProduceObjCObject(S, *this, Entity);
5939 return;
5940 }
5941
5942 assert(S.getLangOpts().CPlusPlus)(static_cast <bool> (S.getLangOpts().CPlusPlus) ? void (
0) : __assert_fail ("S.getLangOpts().CPlusPlus", "clang/lib/Sema/SemaInit.cpp"
, 5942, __extension__ __PRETTY_FUNCTION__))
;
5943
5944 // - If the destination type is a (possibly cv-qualified) class type:
5945 if (DestType->isRecordType()) {
5946 // - If the initialization is direct-initialization, or if it is
5947 // copy-initialization where the cv-unqualified version of the
5948 // source type is the same class as, or a derived class of, the
5949 // class of the destination, constructors are considered. [...]
5950 if (Kind.getKind() == InitializationKind::IK_Direct ||
5951 (Kind.getKind() == InitializationKind::IK_Copy &&
5952 (Context.hasSameUnqualifiedType(SourceType, DestType) ||
5953 S.IsDerivedFrom(Initializer->getBeginLoc(), SourceType, DestType))))
5954 TryConstructorInitialization(S, Entity, Kind, Args,
5955 DestType, DestType, *this);
5956 // - Otherwise (i.e., for the remaining copy-initialization cases),
5957 // user-defined conversion sequences that can convert from the source
5958 // type to the destination type or (when a conversion function is
5959 // used) to a derived class thereof are enumerated as described in
5960 // 13.3.1.4, and the best one is chosen through overload resolution
5961 // (13.3).
5962 else
5963 TryUserDefinedConversion(S, DestType, Kind, Initializer, *this,
5964 TopLevelOfInitList);
5965 return;
5966 }
5967
5968 assert(Args.size() >= 1 && "Zero-argument case handled above")(static_cast <bool> (Args.size() >= 1 && "Zero-argument case handled above"
) ? void (0) : __assert_fail ("Args.size() >= 1 && \"Zero-argument case handled above\""
, "clang/lib/Sema/SemaInit.cpp", 5968, __extension__ __PRETTY_FUNCTION__
))
;
5969
5970 // The remaining cases all need a source type.
5971 if (Args.size() > 1) {
5972 SetFailed(FK_TooManyInitsForScalar);
5973