Bug Summary

File:clang/lib/Sema/SemaInit.cpp
Warning:line 5897, column 16
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -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 -mthread-model posix -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -dwarf-column-info -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D CLANG_VENDOR="Debian " -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/tools/clang/lib/Sema -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2020-01-13-084841-49055-1 -x c++ /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp

/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/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/TargetInfo.h"
21#include "clang/Sema/Designator.h"
22#include "clang/Sema/Initialization.h"
23#include "clang/Sema/Lookup.h"
24#include "clang/Sema/SemaInternal.h"
25#include "llvm/ADT/APInt.h"
26#include "llvm/ADT/SmallString.h"
27#include "llvm/Support/ErrorHandling.h"
28#include "llvm/Support/raw_ostream.h"
29
30using namespace clang;
31
32//===----------------------------------------------------------------------===//
33// Sema Initialization Checking
34//===----------------------------------------------------------------------===//
35
36/// Check whether T is compatible with a wide character type (wchar_t,
37/// char16_t or char32_t).
38static bool IsWideCharCompatible(QualType T, ASTContext &Context) {
39 if (Context.typesAreCompatible(Context.getWideCharType(), T))
40 return true;
41 if (Context.getLangOpts().CPlusPlus || Context.getLangOpts().C11) {
42 return Context.typesAreCompatible(Context.Char16Ty, T) ||
43 Context.typesAreCompatible(Context.Char32Ty, T);
44 }
45 return false;
46}
47
48enum StringInitFailureKind {
49 SIF_None,
50 SIF_NarrowStringIntoWideChar,
51 SIF_WideStringIntoChar,
52 SIF_IncompatWideStringIntoWideChar,
53 SIF_UTF8StringIntoPlainChar,
54 SIF_PlainStringIntoUTF8Char,
55 SIF_Other
56};
57
58/// Check whether the array of type AT can be initialized by the Init
59/// expression by means of string initialization. Returns SIF_None if so,
60/// otherwise returns a StringInitFailureKind that describes why the
61/// initialization would not work.
62static StringInitFailureKind IsStringInit(Expr *Init, const ArrayType *AT,
63 ASTContext &Context) {
64 if (!isa<ConstantArrayType>(AT) && !isa<IncompleteArrayType>(AT))
65 return SIF_Other;
66
67 // See if this is a string literal or @encode.
68 Init = Init->IgnoreParens();
69
70 // Handle @encode, which is a narrow string.
71 if (isa<ObjCEncodeExpr>(Init) && AT->getElementType()->isCharType())
72 return SIF_None;
73
74 // Otherwise we can only handle string literals.
75 StringLiteral *SL = dyn_cast<StringLiteral>(Init);
76 if (!SL)
77 return SIF_Other;
78
79 const QualType ElemTy =
80 Context.getCanonicalType(AT->getElementType()).getUnqualifiedType();
81
82 switch (SL->getKind()) {
83 case StringLiteral::UTF8:
84 // char8_t array can be initialized with a UTF-8 string.
85 if (ElemTy->isChar8Type())
86 return SIF_None;
87 LLVM_FALLTHROUGH[[gnu::fallthrough]];
88 case StringLiteral::Ascii:
89 // char array can be initialized with a narrow string.
90 // Only allow char x[] = "foo"; not char x[] = L"foo";
91 if (ElemTy->isCharType())
92 return (SL->getKind() == StringLiteral::UTF8 &&
93 Context.getLangOpts().Char8)
94 ? SIF_UTF8StringIntoPlainChar
95 : SIF_None;
96 if (ElemTy->isChar8Type())
97 return SIF_PlainStringIntoUTF8Char;
98 if (IsWideCharCompatible(ElemTy, Context))
99 return SIF_NarrowStringIntoWideChar;
100 return SIF_Other;
101 // C99 6.7.8p15 (with correction from DR343), or C11 6.7.9p15:
102 // "An array with element type compatible with a qualified or unqualified
103 // version of wchar_t, char16_t, or char32_t may be initialized by a wide
104 // string literal with the corresponding encoding prefix (L, u, or U,
105 // respectively), optionally enclosed in braces.
106 case StringLiteral::UTF16:
107 if (Context.typesAreCompatible(Context.Char16Ty, ElemTy))
108 return SIF_None;
109 if (ElemTy->isCharType() || ElemTy->isChar8Type())
110 return SIF_WideStringIntoChar;
111 if (IsWideCharCompatible(ElemTy, Context))
112 return SIF_IncompatWideStringIntoWideChar;
113 return SIF_Other;
114 case StringLiteral::UTF32:
115 if (Context.typesAreCompatible(Context.Char32Ty, ElemTy))
116 return SIF_None;
117 if (ElemTy->isCharType() || ElemTy->isChar8Type())
118 return SIF_WideStringIntoChar;
119 if (IsWideCharCompatible(ElemTy, Context))
120 return SIF_IncompatWideStringIntoWideChar;
121 return SIF_Other;
122 case StringLiteral::Wide:
123 if (Context.typesAreCompatible(Context.getWideCharType(), ElemTy))
124 return SIF_None;
125 if (ElemTy->isCharType() || ElemTy->isChar8Type())
126 return SIF_WideStringIntoChar;
127 if (IsWideCharCompatible(ElemTy, Context))
128 return SIF_IncompatWideStringIntoWideChar;
129 return SIF_Other;
130 }
131
132 llvm_unreachable("missed a StringLiteral kind?")::llvm::llvm_unreachable_internal("missed a StringLiteral kind?"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 132)
;
133}
134
135static StringInitFailureKind IsStringInit(Expr *init, QualType declType,
136 ASTContext &Context) {
137 const ArrayType *arrayType = Context.getAsArrayType(declType);
138 if (!arrayType)
139 return SIF_Other;
140 return IsStringInit(init, arrayType, Context);
141}
142
143/// Update the type of a string literal, including any surrounding parentheses,
144/// to match the type of the object which it is initializing.
145static void updateStringLiteralType(Expr *E, QualType Ty) {
146 while (true) {
147 E->setType(Ty);
148 E->setValueKind(VK_RValue);
149 if (isa<StringLiteral>(E) || isa<ObjCEncodeExpr>(E)) {
150 break;
151 } else if (ParenExpr *PE = dyn_cast<ParenExpr>(E)) {
152 E = PE->getSubExpr();
153 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
154 assert(UO->getOpcode() == UO_Extension)((UO->getOpcode() == UO_Extension) ? static_cast<void>
(0) : __assert_fail ("UO->getOpcode() == UO_Extension", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 154, __PRETTY_FUNCTION__))
;
155 E = UO->getSubExpr();
156 } else if (GenericSelectionExpr *GSE = dyn_cast<GenericSelectionExpr>(E)) {
157 E = GSE->getResultExpr();
158 } else if (ChooseExpr *CE = dyn_cast<ChooseExpr>(E)) {
159 E = CE->getChosenSubExpr();
160 } else {
161 llvm_unreachable("unexpected expr in string literal init")::llvm::llvm_unreachable_internal("unexpected expr in string literal init"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 161)
;
162 }
163 }
164}
165
166/// Fix a compound literal initializing an array so it's correctly marked
167/// as an rvalue.
168static void updateGNUCompoundLiteralRValue(Expr *E) {
169 while (true) {
170 E->setValueKind(VK_RValue);
171 if (isa<CompoundLiteralExpr>(E)) {
172 break;
173 } else if (ParenExpr *PE = dyn_cast<ParenExpr>(E)) {
174 E = PE->getSubExpr();
175 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) {
176 assert(UO->getOpcode() == UO_Extension)((UO->getOpcode() == UO_Extension) ? static_cast<void>
(0) : __assert_fail ("UO->getOpcode() == UO_Extension", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 176, __PRETTY_FUNCTION__))
;
177 E = UO->getSubExpr();
178 } else if (GenericSelectionExpr *GSE = dyn_cast<GenericSelectionExpr>(E)) {
179 E = GSE->getResultExpr();
180 } else if (ChooseExpr *CE = dyn_cast<ChooseExpr>(E)) {
181 E = CE->getChosenSubExpr();
182 } else {
183 llvm_unreachable("unexpected expr in array compound literal init")::llvm::llvm_unreachable_internal("unexpected expr in array compound literal init"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 183)
;
184 }
185 }
186}
187
188static void CheckStringInit(Expr *Str, QualType &DeclT, const ArrayType *AT,
189 Sema &S) {
190 // Get the length of the string as parsed.
191 auto *ConstantArrayTy =
192 cast<ConstantArrayType>(Str->getType()->getAsArrayTypeUnsafe());
193 uint64_t StrLength = ConstantArrayTy->getSize().getZExtValue();
194
195 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) {
196 // C99 6.7.8p14. We have an array of character type with unknown size
197 // being initialized to a string literal.
198 llvm::APInt ConstVal(32, StrLength);
199 // Return a new array type (C99 6.7.8p22).
200 DeclT = S.Context.getConstantArrayType(IAT->getElementType(),
201 ConstVal, nullptr,
202 ArrayType::Normal, 0);
203 updateStringLiteralType(Str, DeclT);
204 return;
205 }
206
207 const ConstantArrayType *CAT = cast<ConstantArrayType>(AT);
208
209 // We have an array of character type with known size. However,
210 // the size may be smaller or larger than the string we are initializing.
211 // FIXME: Avoid truncation for 64-bit length strings.
212 if (S.getLangOpts().CPlusPlus) {
213 if (StringLiteral *SL = dyn_cast<StringLiteral>(Str->IgnoreParens())) {
214 // For Pascal strings it's OK to strip off the terminating null character,
215 // so the example below is valid:
216 //
217 // unsigned char a[2] = "\pa";
218 if (SL->isPascal())
219 StrLength--;
220 }
221
222 // [dcl.init.string]p2
223 if (StrLength > CAT->getSize().getZExtValue())
224 S.Diag(Str->getBeginLoc(),
225 diag::err_initializer_string_for_char_array_too_long)
226 << Str->getSourceRange();
227 } else {
228 // C99 6.7.8p14.
229 if (StrLength-1 > CAT->getSize().getZExtValue())
230 S.Diag(Str->getBeginLoc(),
231 diag::ext_initializer_string_for_char_array_too_long)
232 << Str->getSourceRange();
233 }
234
235 // Set the type to the actual size that we are initializing. If we have
236 // something like:
237 // char x[1] = "foo";
238 // then this will set the string literal's type to char[1].
239 updateStringLiteralType(Str, DeclT);
240}
241
242//===----------------------------------------------------------------------===//
243// Semantic checking for initializer lists.
244//===----------------------------------------------------------------------===//
245
246namespace {
247
248/// Semantic checking for initializer lists.
249///
250/// The InitListChecker class contains a set of routines that each
251/// handle the initialization of a certain kind of entity, e.g.,
252/// arrays, vectors, struct/union types, scalars, etc. The
253/// InitListChecker itself performs a recursive walk of the subobject
254/// structure of the type to be initialized, while stepping through
255/// the initializer list one element at a time. The IList and Index
256/// parameters to each of the Check* routines contain the active
257/// (syntactic) initializer list and the index into that initializer
258/// list that represents the current initializer. Each routine is
259/// responsible for moving that Index forward as it consumes elements.
260///
261/// Each Check* routine also has a StructuredList/StructuredIndex
262/// arguments, which contains the current "structured" (semantic)
263/// initializer list and the index into that initializer list where we
264/// are copying initializers as we map them over to the semantic
265/// list. Once we have completed our recursive walk of the subobject
266/// structure, we will have constructed a full semantic initializer
267/// list.
268///
269/// C99 designators cause changes in the initializer list traversal,
270/// because they make the initialization "jump" into a specific
271/// subobject and then continue the initialization from that
272/// point. CheckDesignatedInitializer() recursively steps into the
273/// designated subobject and manages backing out the recursion to
274/// initialize the subobjects after the one designated.
275///
276/// If an initializer list contains any designators, we build a placeholder
277/// structured list even in 'verify only' mode, so that we can track which
278/// elements need 'empty' initializtion.
279class InitListChecker {
280 Sema &SemaRef;
281 bool hadError = false;
282 bool VerifyOnly; // No diagnostics.
283 bool TreatUnavailableAsInvalid; // Used only in VerifyOnly mode.
284 bool InOverloadResolution;
285 InitListExpr *FullyStructuredList = nullptr;
286 NoInitExpr *DummyExpr = nullptr;
287
288 NoInitExpr *getDummyInit() {
289 if (!DummyExpr)
290 DummyExpr = new (SemaRef.Context) NoInitExpr(SemaRef.Context.VoidTy);
291 return DummyExpr;
292 }
293
294 void CheckImplicitInitList(const InitializedEntity &Entity,
295 InitListExpr *ParentIList, QualType T,
296 unsigned &Index, InitListExpr *StructuredList,
297 unsigned &StructuredIndex);
298 void CheckExplicitInitList(const InitializedEntity &Entity,
299 InitListExpr *IList, QualType &T,
300 InitListExpr *StructuredList,
301 bool TopLevelObject = false);
302 void CheckListElementTypes(const InitializedEntity &Entity,
303 InitListExpr *IList, QualType &DeclType,
304 bool SubobjectIsDesignatorContext,
305 unsigned &Index,
306 InitListExpr *StructuredList,
307 unsigned &StructuredIndex,
308 bool TopLevelObject = false);
309 void CheckSubElementType(const InitializedEntity &Entity,
310 InitListExpr *IList, QualType ElemType,
311 unsigned &Index,
312 InitListExpr *StructuredList,
313 unsigned &StructuredIndex);
314 void CheckComplexType(const InitializedEntity &Entity,
315 InitListExpr *IList, QualType DeclType,
316 unsigned &Index,
317 InitListExpr *StructuredList,
318 unsigned &StructuredIndex);
319 void CheckScalarType(const InitializedEntity &Entity,
320 InitListExpr *IList, QualType DeclType,
321 unsigned &Index,
322 InitListExpr *StructuredList,
323 unsigned &StructuredIndex);
324 void CheckReferenceType(const InitializedEntity &Entity,
325 InitListExpr *IList, QualType DeclType,
326 unsigned &Index,
327 InitListExpr *StructuredList,
328 unsigned &StructuredIndex);
329 void CheckVectorType(const InitializedEntity &Entity,
330 InitListExpr *IList, QualType DeclType, unsigned &Index,
331 InitListExpr *StructuredList,
332 unsigned &StructuredIndex);
333 void CheckStructUnionTypes(const InitializedEntity &Entity,
334 InitListExpr *IList, QualType DeclType,
335 CXXRecordDecl::base_class_range Bases,
336 RecordDecl::field_iterator Field,
337 bool SubobjectIsDesignatorContext, unsigned &Index,
338 InitListExpr *StructuredList,
339 unsigned &StructuredIndex,
340 bool TopLevelObject = false);
341 void CheckArrayType(const InitializedEntity &Entity,
342 InitListExpr *IList, QualType &DeclType,
343 llvm::APSInt elementIndex,
344 bool SubobjectIsDesignatorContext, unsigned &Index,
345 InitListExpr *StructuredList,
346 unsigned &StructuredIndex);
347 bool CheckDesignatedInitializer(const InitializedEntity &Entity,
348 InitListExpr *IList, DesignatedInitExpr *DIE,
349 unsigned DesigIdx,
350 QualType &CurrentObjectType,
351 RecordDecl::field_iterator *NextField,
352 llvm::APSInt *NextElementIndex,
353 unsigned &Index,
354 InitListExpr *StructuredList,
355 unsigned &StructuredIndex,
356 bool FinishSubobjectInit,
357 bool TopLevelObject);
358 InitListExpr *getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
359 QualType CurrentObjectType,
360 InitListExpr *StructuredList,
361 unsigned StructuredIndex,
362 SourceRange InitRange,
363 bool IsFullyOverwritten = false);
364 void UpdateStructuredListElement(InitListExpr *StructuredList,
365 unsigned &StructuredIndex,
366 Expr *expr);
367 InitListExpr *createInitListExpr(QualType CurrentObjectType,
368 SourceRange InitRange,
369 unsigned ExpectedNumInits);
370 int numArrayElements(QualType DeclType);
371 int numStructUnionElements(QualType DeclType);
372
373 ExprResult PerformEmptyInit(SourceLocation Loc,
374 const InitializedEntity &Entity);
375
376 /// Diagnose that OldInit (or part thereof) has been overridden by NewInit.
377 void diagnoseInitOverride(Expr *OldInit, SourceRange NewInitRange,
378 bool FullyOverwritten = true) {
379 // Overriding an initializer via a designator is valid with C99 designated
380 // initializers, but ill-formed with C++20 designated initializers.
381 unsigned DiagID = SemaRef.getLangOpts().CPlusPlus
382 ? diag::ext_initializer_overrides
383 : diag::warn_initializer_overrides;
384
385 if (InOverloadResolution && SemaRef.getLangOpts().CPlusPlus) {
386 // In overload resolution, we have to strictly enforce the rules, and so
387 // don't allow any overriding of prior initializers. This matters for a
388 // case such as:
389 //
390 // union U { int a, b; };
391 // struct S { int a, b; };
392 // void f(U), f(S);
393 //
394 // Here, f({.a = 1, .b = 2}) is required to call the struct overload. For
395 // consistency, we disallow all overriding of prior initializers in
396 // overload resolution, not only overriding of union members.
397 hadError = true;
398 } else if (OldInit->getType().isDestructedType() && !FullyOverwritten) {
399 // If we'll be keeping around the old initializer but overwriting part of
400 // the object it initialized, and that object is not trivially
401 // destructible, this can leak. Don't allow that, not even as an
402 // extension.
403 //
404 // FIXME: It might be reasonable to allow this in cases where the part of
405 // the initializer that we're overriding has trivial destruction.
406 DiagID = diag::err_initializer_overrides_destructed;
407 } else if (!OldInit->getSourceRange().isValid()) {
408 // We need to check on source range validity because the previous
409 // initializer does not have to be an explicit initializer. e.g.,
410 //
411 // struct P { int a, b; };
412 // struct PP { struct P p } l = { { .a = 2 }, .p.b = 3 };
413 //
414 // There is an overwrite taking place because the first braced initializer
415 // list "{ .a = 2 }" already provides value for .p.b (which is zero).
416 //
417 // Such overwrites are harmless, so we don't diagnose them. (Note that in
418 // C++, this cannot be reached unless we've already seen and diagnosed a
419 // different conformance issue, such as a mixture of designated and
420 // non-designated initializers or a multi-level designator.)
421 return;
422 }
423
424 if (!VerifyOnly) {
425 SemaRef.Diag(NewInitRange.getBegin(), DiagID)
426 << NewInitRange << FullyOverwritten << OldInit->getType();
427 SemaRef.Diag(OldInit->getBeginLoc(), diag::note_previous_initializer)
428 << (OldInit->HasSideEffects(SemaRef.Context) && FullyOverwritten)
429 << OldInit->getSourceRange();
430 }
431 }
432
433 // Explanation on the "FillWithNoInit" mode:
434 //
435 // Assume we have the following definitions (Case#1):
436 // struct P { char x[6][6]; } xp = { .x[1] = "bar" };
437 // struct PP { struct P lp; } l = { .lp = xp, .lp.x[1][2] = 'f' };
438 //
439 // l.lp.x[1][0..1] should not be filled with implicit initializers because the
440 // "base" initializer "xp" will provide values for them; l.lp.x[1] will be "baf".
441 //
442 // But if we have (Case#2):
443 // struct PP l = { .lp = xp, .lp.x[1] = { [2] = 'f' } };
444 //
445 // l.lp.x[1][0..1] are implicitly initialized and do not use values from the
446 // "base" initializer; l.lp.x[1] will be "\0\0f\0\0\0".
447 //
448 // To distinguish Case#1 from Case#2, and also to avoid leaving many "holes"
449 // in the InitListExpr, the "holes" in Case#1 are filled not with empty
450 // initializers but with special "NoInitExpr" place holders, which tells the
451 // CodeGen not to generate any initializers for these parts.
452 void FillInEmptyInitForBase(unsigned Init, const CXXBaseSpecifier &Base,
453 const InitializedEntity &ParentEntity,
454 InitListExpr *ILE, bool &RequiresSecondPass,
455 bool FillWithNoInit);
456 void FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
457 const InitializedEntity &ParentEntity,
458 InitListExpr *ILE, bool &RequiresSecondPass,
459 bool FillWithNoInit = false);
460 void FillInEmptyInitializations(const InitializedEntity &Entity,
461 InitListExpr *ILE, bool &RequiresSecondPass,
462 InitListExpr *OuterILE, unsigned OuterIndex,
463 bool FillWithNoInit = false);
464 bool CheckFlexibleArrayInit(const InitializedEntity &Entity,
465 Expr *InitExpr, FieldDecl *Field,
466 bool TopLevelObject);
467 void CheckEmptyInitializable(const InitializedEntity &Entity,
468 SourceLocation Loc);
469
470public:
471 InitListChecker(Sema &S, const InitializedEntity &Entity, InitListExpr *IL,
472 QualType &T, bool VerifyOnly, bool TreatUnavailableAsInvalid,
473 bool InOverloadResolution = false);
474 bool HadError() { return hadError; }
475
476 // Retrieves the fully-structured initializer list used for
477 // semantic analysis and code generation.
478 InitListExpr *getFullyStructuredList() const { return FullyStructuredList; }
479};
480
481} // end anonymous namespace
482
483ExprResult InitListChecker::PerformEmptyInit(SourceLocation Loc,
484 const InitializedEntity &Entity) {
485 InitializationKind Kind = InitializationKind::CreateValue(Loc, Loc, Loc,
486 true);
487 MultiExprArg SubInit;
488 Expr *InitExpr;
489 InitListExpr DummyInitList(SemaRef.Context, Loc, None, Loc);
490
491 // C++ [dcl.init.aggr]p7:
492 // If there are fewer initializer-clauses in the list than there are
493 // members in the aggregate, then each member not explicitly initialized
494 // ...
495 bool EmptyInitList = SemaRef.getLangOpts().CPlusPlus11 &&
496 Entity.getType()->getBaseElementTypeUnsafe()->isRecordType();
497 if (EmptyInitList) {
498 // C++1y / DR1070:
499 // shall be initialized [...] from an empty initializer list.
500 //
501 // We apply the resolution of this DR to C++11 but not C++98, since C++98
502 // does not have useful semantics for initialization from an init list.
503 // We treat this as copy-initialization, because aggregate initialization
504 // always performs copy-initialization on its elements.
505 //
506 // Only do this if we're initializing a class type, to avoid filling in
507 // the initializer list where possible.
508 InitExpr = VerifyOnly ? &DummyInitList : new (SemaRef.Context)
509 InitListExpr(SemaRef.Context, Loc, None, Loc);
510 InitExpr->setType(SemaRef.Context.VoidTy);
511 SubInit = InitExpr;
512 Kind = InitializationKind::CreateCopy(Loc, Loc);
513 } else {
514 // C++03:
515 // shall be value-initialized.
516 }
517
518 InitializationSequence InitSeq(SemaRef, Entity, Kind, SubInit);
519 // libstdc++4.6 marks the vector default constructor as explicit in
520 // _GLIBCXX_DEBUG mode, so recover using the C++03 logic in that case.
521 // stlport does so too. Look for std::__debug for libstdc++, and for
522 // std:: for stlport. This is effectively a compiler-side implementation of
523 // LWG2193.
524 if (!InitSeq && EmptyInitList && InitSeq.getFailureKind() ==
525 InitializationSequence::FK_ExplicitConstructor) {
526 OverloadCandidateSet::iterator Best;
527 OverloadingResult O =
528 InitSeq.getFailedCandidateSet()
529 .BestViableFunction(SemaRef, Kind.getLocation(), Best);
530 (void)O;
531 assert(O == OR_Success && "Inconsistent overload resolution")((O == OR_Success && "Inconsistent overload resolution"
) ? static_cast<void> (0) : __assert_fail ("O == OR_Success && \"Inconsistent overload resolution\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 531, __PRETTY_FUNCTION__))
;
532 CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
533 CXXRecordDecl *R = CtorDecl->getParent();
534
535 if (CtorDecl->getMinRequiredArguments() == 0 &&
536 CtorDecl->isExplicit() && R->getDeclName() &&
537 SemaRef.SourceMgr.isInSystemHeader(CtorDecl->getLocation())) {
538 bool IsInStd = false;
539 for (NamespaceDecl *ND = dyn_cast<NamespaceDecl>(R->getDeclContext());
540 ND && !IsInStd; ND = dyn_cast<NamespaceDecl>(ND->getParent())) {
541 if (SemaRef.getStdNamespace()->InEnclosingNamespaceSetOf(ND))
542 IsInStd = true;
543 }
544
545 if (IsInStd && llvm::StringSwitch<bool>(R->getName())
546 .Cases("basic_string", "deque", "forward_list", true)
547 .Cases("list", "map", "multimap", "multiset", true)
548 .Cases("priority_queue", "queue", "set", "stack", true)
549 .Cases("unordered_map", "unordered_set", "vector", true)
550 .Default(false)) {
551 InitSeq.InitializeFrom(
552 SemaRef, Entity,
553 InitializationKind::CreateValue(Loc, Loc, Loc, true),
554 MultiExprArg(), /*TopLevelOfInitList=*/false,
555 TreatUnavailableAsInvalid);
556 // Emit a warning for this. System header warnings aren't shown
557 // by default, but people working on system headers should see it.
558 if (!VerifyOnly) {
559 SemaRef.Diag(CtorDecl->getLocation(),
560 diag::warn_invalid_initializer_from_system_header);
561 if (Entity.getKind() == InitializedEntity::EK_Member)
562 SemaRef.Diag(Entity.getDecl()->getLocation(),
563 diag::note_used_in_initialization_here);
564 else if (Entity.getKind() == InitializedEntity::EK_ArrayElement)
565 SemaRef.Diag(Loc, diag::note_used_in_initialization_here);
566 }
567 }
568 }
569 }
570 if (!InitSeq) {
571 if (!VerifyOnly) {
572 InitSeq.Diagnose(SemaRef, Entity, Kind, SubInit);
573 if (Entity.getKind() == InitializedEntity::EK_Member)
574 SemaRef.Diag(Entity.getDecl()->getLocation(),
575 diag::note_in_omitted_aggregate_initializer)
576 << /*field*/1 << Entity.getDecl();
577 else if (Entity.getKind() == InitializedEntity::EK_ArrayElement) {
578 bool IsTrailingArrayNewMember =
579 Entity.getParent() &&
580 Entity.getParent()->isVariableLengthArrayNew();
581 SemaRef.Diag(Loc, diag::note_in_omitted_aggregate_initializer)
582 << (IsTrailingArrayNewMember ? 2 : /*array element*/0)
583 << Entity.getElementIndex();
584 }
585 }
586 hadError = true;
587 return ExprError();
588 }
589
590 return VerifyOnly ? ExprResult()
591 : InitSeq.Perform(SemaRef, Entity, Kind, SubInit);
592}
593
594void InitListChecker::CheckEmptyInitializable(const InitializedEntity &Entity,
595 SourceLocation Loc) {
596 // If we're building a fully-structured list, we'll check this at the end
597 // once we know which elements are actually initialized. Otherwise, we know
598 // that there are no designators so we can just check now.
599 if (FullyStructuredList)
600 return;
601 PerformEmptyInit(Loc, Entity);
602}
603
604void InitListChecker::FillInEmptyInitForBase(
605 unsigned Init, const CXXBaseSpecifier &Base,
606 const InitializedEntity &ParentEntity, InitListExpr *ILE,
607 bool &RequiresSecondPass, bool FillWithNoInit) {
608 InitializedEntity BaseEntity = InitializedEntity::InitializeBase(
609 SemaRef.Context, &Base, false, &ParentEntity);
610
611 if (Init >= ILE->getNumInits() || !ILE->getInit(Init)) {
612 ExprResult BaseInit = FillWithNoInit
613 ? new (SemaRef.Context) NoInitExpr(Base.getType())
614 : PerformEmptyInit(ILE->getEndLoc(), BaseEntity);
615 if (BaseInit.isInvalid()) {
616 hadError = true;
617 return;
618 }
619
620 if (!VerifyOnly) {
621 assert(Init < ILE->getNumInits() && "should have been expanded")((Init < ILE->getNumInits() && "should have been expanded"
) ? static_cast<void> (0) : __assert_fail ("Init < ILE->getNumInits() && \"should have been expanded\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 621, __PRETTY_FUNCTION__))
;
622 ILE->setInit(Init, BaseInit.getAs<Expr>());
623 }
624 } else if (InitListExpr *InnerILE =
625 dyn_cast<InitListExpr>(ILE->getInit(Init))) {
626 FillInEmptyInitializations(BaseEntity, InnerILE, RequiresSecondPass,
627 ILE, Init, FillWithNoInit);
628 } else if (DesignatedInitUpdateExpr *InnerDIUE =
629 dyn_cast<DesignatedInitUpdateExpr>(ILE->getInit(Init))) {
630 FillInEmptyInitializations(BaseEntity, InnerDIUE->getUpdater(),
631 RequiresSecondPass, ILE, Init,
632 /*FillWithNoInit =*/true);
633 }
634}
635
636void InitListChecker::FillInEmptyInitForField(unsigned Init, FieldDecl *Field,
637 const InitializedEntity &ParentEntity,
638 InitListExpr *ILE,
639 bool &RequiresSecondPass,
640 bool FillWithNoInit) {
641 SourceLocation Loc = ILE->getEndLoc();
642 unsigned NumInits = ILE->getNumInits();
643 InitializedEntity MemberEntity
644 = InitializedEntity::InitializeMember(Field, &ParentEntity);
645
646 if (Init >= NumInits || !ILE->getInit(Init)) {
647 if (const RecordType *RType = ILE->getType()->getAs<RecordType>())
648 if (!RType->getDecl()->isUnion())
649 assert((Init < NumInits || VerifyOnly) &&(((Init < NumInits || VerifyOnly) && "This ILE should have been expanded"
) ? static_cast<void> (0) : __assert_fail ("(Init < NumInits || VerifyOnly) && \"This ILE should have been expanded\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 650, __PRETTY_FUNCTION__))
650 "This ILE should have been expanded")(((Init < NumInits || VerifyOnly) && "This ILE should have been expanded"
) ? static_cast<void> (0) : __assert_fail ("(Init < NumInits || VerifyOnly) && \"This ILE should have been expanded\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 650, __PRETTY_FUNCTION__))
;
651
652 if (FillWithNoInit) {
653 assert(!VerifyOnly && "should not fill with no-init in verify-only mode")((!VerifyOnly && "should not fill with no-init in verify-only mode"
) ? static_cast<void> (0) : __assert_fail ("!VerifyOnly && \"should not fill with no-init in verify-only mode\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 653, __PRETTY_FUNCTION__))
;
654 Expr *Filler = new (SemaRef.Context) NoInitExpr(Field->getType());
655 if (Init < NumInits)
656 ILE->setInit(Init, Filler);
657 else
658 ILE->updateInit(SemaRef.Context, Init, Filler);
659 return;
660 }
661 // C++1y [dcl.init.aggr]p7:
662 // If there are fewer initializer-clauses in the list than there are
663 // members in the aggregate, then each member not explicitly initialized
664 // shall be initialized from its brace-or-equal-initializer [...]
665 if (Field->hasInClassInitializer()) {
666 if (VerifyOnly)
667 return;
668
669 ExprResult DIE = SemaRef.BuildCXXDefaultInitExpr(Loc, Field);
670 if (DIE.isInvalid()) {
671 hadError = true;
672 return;
673 }
674 SemaRef.checkInitializerLifetime(MemberEntity, DIE.get());
675 if (Init < NumInits)
676 ILE->setInit(Init, DIE.get());
677 else {
678 ILE->updateInit(SemaRef.Context, Init, DIE.get());
679 RequiresSecondPass = true;
680 }
681 return;
682 }
683
684 if (Field->getType()->isReferenceType()) {
685 if (!VerifyOnly) {
686 // C++ [dcl.init.aggr]p9:
687 // If an incomplete or empty initializer-list leaves a
688 // member of reference type uninitialized, the program is
689 // ill-formed.
690 SemaRef.Diag(Loc, diag::err_init_reference_member_uninitialized)
691 << Field->getType()
692 << ILE->getSyntacticForm()->getSourceRange();
693 SemaRef.Diag(Field->getLocation(),
694 diag::note_uninit_reference_member);
695 }
696 hadError = true;
697 return;
698 }
699
700 ExprResult MemberInit = PerformEmptyInit(Loc, MemberEntity);
701 if (MemberInit.isInvalid()) {
702 hadError = true;
703 return;
704 }
705
706 if (hadError || VerifyOnly) {
707 // Do nothing
708 } else if (Init < NumInits) {
709 ILE->setInit(Init, MemberInit.getAs<Expr>());
710 } else if (!isa<ImplicitValueInitExpr>(MemberInit.get())) {
711 // Empty initialization requires a constructor call, so
712 // extend the initializer list to include the constructor
713 // call and make a note that we'll need to take another pass
714 // through the initializer list.
715 ILE->updateInit(SemaRef.Context, Init, MemberInit.getAs<Expr>());
716 RequiresSecondPass = true;
717 }
718 } else if (InitListExpr *InnerILE
719 = dyn_cast<InitListExpr>(ILE->getInit(Init))) {
720 FillInEmptyInitializations(MemberEntity, InnerILE,
721 RequiresSecondPass, ILE, Init, FillWithNoInit);
722 } else if (DesignatedInitUpdateExpr *InnerDIUE =
723 dyn_cast<DesignatedInitUpdateExpr>(ILE->getInit(Init))) {
724 FillInEmptyInitializations(MemberEntity, InnerDIUE->getUpdater(),
725 RequiresSecondPass, ILE, Init,
726 /*FillWithNoInit =*/true);
727 }
728}
729
730/// Recursively replaces NULL values within the given initializer list
731/// with expressions that perform value-initialization of the
732/// appropriate type, and finish off the InitListExpr formation.
733void
734InitListChecker::FillInEmptyInitializations(const InitializedEntity &Entity,
735 InitListExpr *ILE,
736 bool &RequiresSecondPass,
737 InitListExpr *OuterILE,
738 unsigned OuterIndex,
739 bool FillWithNoInit) {
740 assert((ILE->getType() != SemaRef.Context.VoidTy) &&(((ILE->getType() != SemaRef.Context.VoidTy) && "Should not have void type"
) ? static_cast<void> (0) : __assert_fail ("(ILE->getType() != SemaRef.Context.VoidTy) && \"Should not have void type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 741, __PRETTY_FUNCTION__))
741 "Should not have void type")(((ILE->getType() != SemaRef.Context.VoidTy) && "Should not have void type"
) ? static_cast<void> (0) : __assert_fail ("(ILE->getType() != SemaRef.Context.VoidTy) && \"Should not have void type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 741, __PRETTY_FUNCTION__))
;
742
743 // We don't need to do any checks when just filling NoInitExprs; that can't
744 // fail.
745 if (FillWithNoInit && VerifyOnly)
746 return;
747
748 // If this is a nested initializer list, we might have changed its contents
749 // (and therefore some of its properties, such as instantiation-dependence)
750 // while filling it in. Inform the outer initializer list so that its state
751 // can be updated to match.
752 // FIXME: We should fully build the inner initializers before constructing
753 // the outer InitListExpr instead of mutating AST nodes after they have
754 // been used as subexpressions of other nodes.
755 struct UpdateOuterILEWithUpdatedInit {
756 InitListExpr *Outer;
757 unsigned OuterIndex;
758 ~UpdateOuterILEWithUpdatedInit() {
759 if (Outer)
760 Outer->setInit(OuterIndex, Outer->getInit(OuterIndex));
761 }
762 } UpdateOuterRAII = {OuterILE, OuterIndex};
763
764 // A transparent ILE is not performing aggregate initialization and should
765 // not be filled in.
766 if (ILE->isTransparent())
767 return;
768
769 if (const RecordType *RType = ILE->getType()->getAs<RecordType>()) {
770 const RecordDecl *RDecl = RType->getDecl();
771 if (RDecl->isUnion() && ILE->getInitializedFieldInUnion())
772 FillInEmptyInitForField(0, ILE->getInitializedFieldInUnion(),
773 Entity, ILE, RequiresSecondPass, FillWithNoInit);
774 else if (RDecl->isUnion() && isa<CXXRecordDecl>(RDecl) &&
775 cast<CXXRecordDecl>(RDecl)->hasInClassInitializer()) {
776 for (auto *Field : RDecl->fields()) {
777 if (Field->hasInClassInitializer()) {
778 FillInEmptyInitForField(0, Field, Entity, ILE, RequiresSecondPass,
779 FillWithNoInit);
780 break;
781 }
782 }
783 } else {
784 // The fields beyond ILE->getNumInits() are default initialized, so in
785 // order to leave them uninitialized, the ILE is expanded and the extra
786 // fields are then filled with NoInitExpr.
787 unsigned NumElems = numStructUnionElements(ILE->getType());
788 if (RDecl->hasFlexibleArrayMember())
789 ++NumElems;
790 if (!VerifyOnly && ILE->getNumInits() < NumElems)
791 ILE->resizeInits(SemaRef.Context, NumElems);
792
793 unsigned Init = 0;
794
795 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RDecl)) {
796 for (auto &Base : CXXRD->bases()) {
797 if (hadError)
798 return;
799
800 FillInEmptyInitForBase(Init, Base, Entity, ILE, RequiresSecondPass,
801 FillWithNoInit);
802 ++Init;
803 }
804 }
805
806 for (auto *Field : RDecl->fields()) {
807 if (Field->isUnnamedBitfield())
808 continue;
809
810 if (hadError)
811 return;
812
813 FillInEmptyInitForField(Init, Field, Entity, ILE, RequiresSecondPass,
814 FillWithNoInit);
815 if (hadError)
816 return;
817
818 ++Init;
819
820 // Only look at the first initialization of a union.
821 if (RDecl->isUnion())
822 break;
823 }
824 }
825
826 return;
827 }
828
829 QualType ElementType;
830
831 InitializedEntity ElementEntity = Entity;
832 unsigned NumInits = ILE->getNumInits();
833 unsigned NumElements = NumInits;
834 if (const ArrayType *AType = SemaRef.Context.getAsArrayType(ILE->getType())) {
835 ElementType = AType->getElementType();
836 if (const auto *CAType = dyn_cast<ConstantArrayType>(AType))
837 NumElements = CAType->getSize().getZExtValue();
838 // For an array new with an unknown bound, ask for one additional element
839 // in order to populate the array filler.
840 if (Entity.isVariableLengthArrayNew())
841 ++NumElements;
842 ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context,
843 0, Entity);
844 } else if (const VectorType *VType = ILE->getType()->getAs<VectorType>()) {
845 ElementType = VType->getElementType();
846 NumElements = VType->getNumElements();
847 ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context,
848 0, Entity);
849 } else
850 ElementType = ILE->getType();
851
852 bool SkipEmptyInitChecks = false;
853 for (unsigned Init = 0; Init != NumElements; ++Init) {
854 if (hadError)
855 return;
856
857 if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement ||
858 ElementEntity.getKind() == InitializedEntity::EK_VectorElement)
859 ElementEntity.setElementIndex(Init);
860
861 if (Init >= NumInits && (ILE->hasArrayFiller() || SkipEmptyInitChecks))
862 return;
863
864 Expr *InitExpr = (Init < NumInits ? ILE->getInit(Init) : nullptr);
865 if (!InitExpr && Init < NumInits && ILE->hasArrayFiller())
866 ILE->setInit(Init, ILE->getArrayFiller());
867 else if (!InitExpr && !ILE->hasArrayFiller()) {
868 // In VerifyOnly mode, there's no point performing empty initialization
869 // more than once.
870 if (SkipEmptyInitChecks)
871 continue;
872
873 Expr *Filler = nullptr;
874
875 if (FillWithNoInit)
876 Filler = new (SemaRef.Context) NoInitExpr(ElementType);
877 else {
878 ExprResult ElementInit =
879 PerformEmptyInit(ILE->getEndLoc(), ElementEntity);
880 if (ElementInit.isInvalid()) {
881 hadError = true;
882 return;
883 }
884
885 Filler = ElementInit.getAs<Expr>();
886 }
887
888 if (hadError) {
889 // Do nothing
890 } else if (VerifyOnly) {
891 SkipEmptyInitChecks = true;
892 } else if (Init < NumInits) {
893 // For arrays, just set the expression used for value-initialization
894 // of the "holes" in the array.
895 if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement)
896 ILE->setArrayFiller(Filler);
897 else
898 ILE->setInit(Init, Filler);
899 } else {
900 // For arrays, just set the expression used for value-initialization
901 // of the rest of elements and exit.
902 if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement) {
903 ILE->setArrayFiller(Filler);
904 return;
905 }
906
907 if (!isa<ImplicitValueInitExpr>(Filler) && !isa<NoInitExpr>(Filler)) {
908 // Empty initialization requires a constructor call, so
909 // extend the initializer list to include the constructor
910 // call and make a note that we'll need to take another pass
911 // through the initializer list.
912 ILE->updateInit(SemaRef.Context, Init, Filler);
913 RequiresSecondPass = true;
914 }
915 }
916 } else if (InitListExpr *InnerILE
917 = dyn_cast_or_null<InitListExpr>(InitExpr)) {
918 FillInEmptyInitializations(ElementEntity, InnerILE, RequiresSecondPass,
919 ILE, Init, FillWithNoInit);
920 } else if (DesignatedInitUpdateExpr *InnerDIUE =
921 dyn_cast_or_null<DesignatedInitUpdateExpr>(InitExpr)) {
922 FillInEmptyInitializations(ElementEntity, InnerDIUE->getUpdater(),
923 RequiresSecondPass, ILE, Init,
924 /*FillWithNoInit =*/true);
925 }
926 }
927}
928
929static bool hasAnyDesignatedInits(const InitListExpr *IL) {
930 for (const Stmt *Init : *IL)
931 if (Init && isa<DesignatedInitExpr>(Init))
932 return true;
933 return false;
934}
935
936InitListChecker::InitListChecker(Sema &S, const InitializedEntity &Entity,
937 InitListExpr *IL, QualType &T, bool VerifyOnly,
938 bool TreatUnavailableAsInvalid,
939 bool InOverloadResolution)
940 : SemaRef(S), VerifyOnly(VerifyOnly),
941 TreatUnavailableAsInvalid(TreatUnavailableAsInvalid),
942 InOverloadResolution(InOverloadResolution) {
943 if (!VerifyOnly || hasAnyDesignatedInits(IL)) {
944 FullyStructuredList =
945 createInitListExpr(T, IL->getSourceRange(), IL->getNumInits());
946
947 // FIXME: Check that IL isn't already the semantic form of some other
948 // InitListExpr. If it is, we'd create a broken AST.
949 if (!VerifyOnly)
950 FullyStructuredList->setSyntacticForm(IL);
951 }
952
953 CheckExplicitInitList(Entity, IL, T, FullyStructuredList,
954 /*TopLevelObject=*/true);
955
956 if (!hadError && FullyStructuredList) {
957 bool RequiresSecondPass = false;
958 FillInEmptyInitializations(Entity, FullyStructuredList, RequiresSecondPass,
959 /*OuterILE=*/nullptr, /*OuterIndex=*/0);
960 if (RequiresSecondPass && !hadError)
961 FillInEmptyInitializations(Entity, FullyStructuredList,
962 RequiresSecondPass, nullptr, 0);
963 }
964}
965
966int InitListChecker::numArrayElements(QualType DeclType) {
967 // FIXME: use a proper constant
968 int maxElements = 0x7FFFFFFF;
969 if (const ConstantArrayType *CAT =
970 SemaRef.Context.getAsConstantArrayType(DeclType)) {
971 maxElements = static_cast<int>(CAT->getSize().getZExtValue());
972 }
973 return maxElements;
974}
975
976int InitListChecker::numStructUnionElements(QualType DeclType) {
977 RecordDecl *structDecl = DeclType->castAs<RecordType>()->getDecl();
978 int InitializableMembers = 0;
979 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(structDecl))
980 InitializableMembers += CXXRD->getNumBases();
981 for (const auto *Field : structDecl->fields())
982 if (!Field->isUnnamedBitfield())
983 ++InitializableMembers;
984
985 if (structDecl->isUnion())
986 return std::min(InitializableMembers, 1);
987 return InitializableMembers - structDecl->hasFlexibleArrayMember();
988}
989
990/// Determine whether Entity is an entity for which it is idiomatic to elide
991/// the braces in aggregate initialization.
992static bool isIdiomaticBraceElisionEntity(const InitializedEntity &Entity) {
993 // Recursive initialization of the one and only field within an aggregate
994 // class is considered idiomatic. This case arises in particular for
995 // initialization of std::array, where the C++ standard suggests the idiom of
996 //
997 // std::array<T, N> arr = {1, 2, 3};
998 //
999 // (where std::array is an aggregate struct containing a single array field.
1000
1001 // FIXME: Should aggregate initialization of a struct with a single
1002 // base class and no members also suppress the warning?
1003 if (Entity.getKind() != InitializedEntity::EK_Member || !Entity.getParent())
1004 return false;
1005
1006 auto *ParentRD =
1007 Entity.getParent()->getType()->castAs<RecordType>()->getDecl();
1008 if (CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(ParentRD))
1009 if (CXXRD->getNumBases())
1010 return false;
1011
1012 auto FieldIt = ParentRD->field_begin();
1013 assert(FieldIt != ParentRD->field_end() &&((FieldIt != ParentRD->field_end() && "no fields but have initializer for member?"
) ? static_cast<void> (0) : __assert_fail ("FieldIt != ParentRD->field_end() && \"no fields but have initializer for member?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1014, __PRETTY_FUNCTION__))
1014 "no fields but have initializer for member?")((FieldIt != ParentRD->field_end() && "no fields but have initializer for member?"
) ? static_cast<void> (0) : __assert_fail ("FieldIt != ParentRD->field_end() && \"no fields but have initializer for member?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1014, __PRETTY_FUNCTION__))
;
1015 return ++FieldIt == ParentRD->field_end();
1016}
1017
1018/// Check whether the range of the initializer \p ParentIList from element
1019/// \p Index onwards can be used to initialize an object of type \p T. Update
1020/// \p Index to indicate how many elements of the list were consumed.
1021///
1022/// This also fills in \p StructuredList, from element \p StructuredIndex
1023/// onwards, with the fully-braced, desugared form of the initialization.
1024void InitListChecker::CheckImplicitInitList(const InitializedEntity &Entity,
1025 InitListExpr *ParentIList,
1026 QualType T, unsigned &Index,
1027 InitListExpr *StructuredList,
1028 unsigned &StructuredIndex) {
1029 int maxElements = 0;
1030
1031 if (T->isArrayType())
1032 maxElements = numArrayElements(T);
1033 else if (T->isRecordType())
1034 maxElements = numStructUnionElements(T);
1035 else if (T->isVectorType())
1036 maxElements = T->castAs<VectorType>()->getNumElements();
1037 else
1038 llvm_unreachable("CheckImplicitInitList(): Illegal type")::llvm::llvm_unreachable_internal("CheckImplicitInitList(): Illegal type"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1038)
;
1039
1040 if (maxElements == 0) {
1041 if (!VerifyOnly)
1042 SemaRef.Diag(ParentIList->getInit(Index)->getBeginLoc(),
1043 diag::err_implicit_empty_initializer);
1044 ++Index;
1045 hadError = true;
1046 return;
1047 }
1048
1049 // Build a structured initializer list corresponding to this subobject.
1050 InitListExpr *StructuredSubobjectInitList = getStructuredSubobjectInit(
1051 ParentIList, Index, T, StructuredList, StructuredIndex,
1052 SourceRange(ParentIList->getInit(Index)->getBeginLoc(),
1053 ParentIList->getSourceRange().getEnd()));
1054 unsigned StructuredSubobjectInitIndex = 0;
1055
1056 // Check the element types and build the structural subobject.
1057 unsigned StartIndex = Index;
1058 CheckListElementTypes(Entity, ParentIList, T,
1059 /*SubobjectIsDesignatorContext=*/false, Index,
1060 StructuredSubobjectInitList,
1061 StructuredSubobjectInitIndex);
1062
1063 if (StructuredSubobjectInitList) {
1064 StructuredSubobjectInitList->setType(T);
1065
1066 unsigned EndIndex = (Index == StartIndex? StartIndex : Index - 1);
1067 // Update the structured sub-object initializer so that it's ending
1068 // range corresponds with the end of the last initializer it used.
1069 if (EndIndex < ParentIList->getNumInits() &&
1070 ParentIList->getInit(EndIndex)) {
1071 SourceLocation EndLoc
1072 = ParentIList->getInit(EndIndex)->getSourceRange().getEnd();
1073 StructuredSubobjectInitList->setRBraceLoc(EndLoc);
1074 }
1075
1076 // Complain about missing braces.
1077 if (!VerifyOnly && (T->isArrayType() || T->isRecordType()) &&
1078 !ParentIList->isIdiomaticZeroInitializer(SemaRef.getLangOpts()) &&
1079 !isIdiomaticBraceElisionEntity(Entity)) {
1080 SemaRef.Diag(StructuredSubobjectInitList->getBeginLoc(),
1081 diag::warn_missing_braces)
1082 << StructuredSubobjectInitList->getSourceRange()
1083 << FixItHint::CreateInsertion(
1084 StructuredSubobjectInitList->getBeginLoc(), "{")
1085 << FixItHint::CreateInsertion(
1086 SemaRef.getLocForEndOfToken(
1087 StructuredSubobjectInitList->getEndLoc()),
1088 "}");
1089 }
1090
1091 // Warn if this type won't be an aggregate in future versions of C++.
1092 auto *CXXRD = T->getAsCXXRecordDecl();
1093 if (!VerifyOnly && CXXRD && CXXRD->hasUserDeclaredConstructor()) {
1094 SemaRef.Diag(StructuredSubobjectInitList->getBeginLoc(),
1095 diag::warn_cxx2a_compat_aggregate_init_with_ctors)
1096 << StructuredSubobjectInitList->getSourceRange() << T;
1097 }
1098 }
1099}
1100
1101/// Warn that \p Entity was of scalar type and was initialized by a
1102/// single-element braced initializer list.
1103static void warnBracedScalarInit(Sema &S, const InitializedEntity &Entity,
1104 SourceRange Braces) {
1105 // Don't warn during template instantiation. If the initialization was
1106 // non-dependent, we warned during the initial parse; otherwise, the
1107 // type might not be scalar in some uses of the template.
1108 if (S.inTemplateInstantiation())
1109 return;
1110
1111 unsigned DiagID = 0;
1112
1113 switch (Entity.getKind()) {
1114 case InitializedEntity::EK_VectorElement:
1115 case InitializedEntity::EK_ComplexElement:
1116 case InitializedEntity::EK_ArrayElement:
1117 case InitializedEntity::EK_Parameter:
1118 case InitializedEntity::EK_Parameter_CF_Audited:
1119 case InitializedEntity::EK_Result:
1120 // Extra braces here are suspicious.
1121 DiagID = diag::warn_braces_around_scalar_init;
1122 break;
1123
1124 case InitializedEntity::EK_Member:
1125 // Warn on aggregate initialization but not on ctor init list or
1126 // default member initializer.
1127 if (Entity.getParent())
1128 DiagID = diag::warn_braces_around_scalar_init;
1129 break;
1130
1131 case InitializedEntity::EK_Variable:
1132 case InitializedEntity::EK_LambdaCapture:
1133 // No warning, might be direct-list-initialization.
1134 // FIXME: Should we warn for copy-list-initialization in these cases?
1135 break;
1136
1137 case InitializedEntity::EK_New:
1138 case InitializedEntity::EK_Temporary:
1139 case InitializedEntity::EK_CompoundLiteralInit:
1140 // No warning, braces are part of the syntax of the underlying construct.
1141 break;
1142
1143 case InitializedEntity::EK_RelatedResult:
1144 // No warning, we already warned when initializing the result.
1145 break;
1146
1147 case InitializedEntity::EK_Exception:
1148 case InitializedEntity::EK_Base:
1149 case InitializedEntity::EK_Delegating:
1150 case InitializedEntity::EK_BlockElement:
1151 case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
1152 case InitializedEntity::EK_Binding:
1153 case InitializedEntity::EK_StmtExprResult:
1154 llvm_unreachable("unexpected braced scalar init")::llvm::llvm_unreachable_internal("unexpected braced scalar init"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1154)
;
1155 }
1156
1157 if (DiagID) {
1158 S.Diag(Braces.getBegin(), DiagID)
1159 << Braces
1160 << FixItHint::CreateRemoval(Braces.getBegin())
1161 << FixItHint::CreateRemoval(Braces.getEnd());
1162 }
1163}
1164
1165/// Check whether the initializer \p IList (that was written with explicit
1166/// braces) can be used to initialize an object of type \p T.
1167///
1168/// This also fills in \p StructuredList with the fully-braced, desugared
1169/// form of the initialization.
1170void InitListChecker::CheckExplicitInitList(const InitializedEntity &Entity,
1171 InitListExpr *IList, QualType &T,
1172 InitListExpr *StructuredList,
1173 bool TopLevelObject) {
1174 unsigned Index = 0, StructuredIndex = 0;
1175 CheckListElementTypes(Entity, IList, T, /*SubobjectIsDesignatorContext=*/true,
1176 Index, StructuredList, StructuredIndex, TopLevelObject);
1177 if (StructuredList) {
1178 QualType ExprTy = T;
1179 if (!ExprTy->isArrayType())
1180 ExprTy = ExprTy.getNonLValueExprType(SemaRef.Context);
1181 if (!VerifyOnly)
1182 IList->setType(ExprTy);
1183 StructuredList->setType(ExprTy);
1184 }
1185 if (hadError)
1186 return;
1187
1188 // Don't complain for incomplete types, since we'll get an error elsewhere.
1189 if (Index < IList->getNumInits() && !T->isIncompleteType()) {
1190 // We have leftover initializers
1191 bool ExtraInitsIsError = SemaRef.getLangOpts().CPlusPlus ||
1192 (SemaRef.getLangOpts().OpenCL && T->isVectorType());
1193 hadError = ExtraInitsIsError;
1194 if (VerifyOnly) {
1195 return;
1196 } else if (StructuredIndex == 1 &&
1197 IsStringInit(StructuredList->getInit(0), T, SemaRef.Context) ==
1198 SIF_None) {
1199 unsigned DK =
1200 ExtraInitsIsError
1201 ? diag::err_excess_initializers_in_char_array_initializer
1202 : diag::ext_excess_initializers_in_char_array_initializer;
1203 SemaRef.Diag(IList->getInit(Index)->getBeginLoc(), DK)
1204 << IList->getInit(Index)->getSourceRange();
1205 } else {
1206 int initKind = T->isArrayType() ? 0 :
1207 T->isVectorType() ? 1 :
1208 T->isScalarType() ? 2 :
1209 T->isUnionType() ? 3 :
1210 4;
1211
1212 unsigned DK = ExtraInitsIsError ? diag::err_excess_initializers
1213 : diag::ext_excess_initializers;
1214 SemaRef.Diag(IList->getInit(Index)->getBeginLoc(), DK)
1215 << initKind << IList->getInit(Index)->getSourceRange();
1216 }
1217 }
1218
1219 if (!VerifyOnly) {
1220 if (T->isScalarType() && IList->getNumInits() == 1 &&
1221 !isa<InitListExpr>(IList->getInit(0)))
1222 warnBracedScalarInit(SemaRef, Entity, IList->getSourceRange());
1223
1224 // Warn if this is a class type that won't be an aggregate in future
1225 // versions of C++.
1226 auto *CXXRD = T->getAsCXXRecordDecl();
1227 if (CXXRD && CXXRD->hasUserDeclaredConstructor()) {
1228 // Don't warn if there's an equivalent default constructor that would be
1229 // used instead.
1230 bool HasEquivCtor = false;
1231 if (IList->getNumInits() == 0) {
1232 auto *CD = SemaRef.LookupDefaultConstructor(CXXRD);
1233 HasEquivCtor = CD && !CD->isDeleted();
1234 }
1235
1236 if (!HasEquivCtor) {
1237 SemaRef.Diag(IList->getBeginLoc(),
1238 diag::warn_cxx2a_compat_aggregate_init_with_ctors)
1239 << IList->getSourceRange() << T;
1240 }
1241 }
1242 }
1243}
1244
1245void InitListChecker::CheckListElementTypes(const InitializedEntity &Entity,
1246 InitListExpr *IList,
1247 QualType &DeclType,
1248 bool SubobjectIsDesignatorContext,
1249 unsigned &Index,
1250 InitListExpr *StructuredList,
1251 unsigned &StructuredIndex,
1252 bool TopLevelObject) {
1253 if (DeclType->isAnyComplexType() && SubobjectIsDesignatorContext) {
1254 // Explicitly braced initializer for complex type can be real+imaginary
1255 // parts.
1256 CheckComplexType(Entity, IList, DeclType, Index,
1257 StructuredList, StructuredIndex);
1258 } else if (DeclType->isScalarType()) {
1259 CheckScalarType(Entity, IList, DeclType, Index,
1260 StructuredList, StructuredIndex);
1261 } else if (DeclType->isVectorType()) {
1262 CheckVectorType(Entity, IList, DeclType, Index,
1263 StructuredList, StructuredIndex);
1264 } else if (DeclType->isRecordType()) {
1265 assert(DeclType->isAggregateType() &&((DeclType->isAggregateType() && "non-aggregate records should be handed in CheckSubElementType"
) ? static_cast<void> (0) : __assert_fail ("DeclType->isAggregateType() && \"non-aggregate records should be handed in CheckSubElementType\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1266, __PRETTY_FUNCTION__))
1266 "non-aggregate records should be handed in CheckSubElementType")((DeclType->isAggregateType() && "non-aggregate records should be handed in CheckSubElementType"
) ? static_cast<void> (0) : __assert_fail ("DeclType->isAggregateType() && \"non-aggregate records should be handed in CheckSubElementType\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1266, __PRETTY_FUNCTION__))
;
1267 RecordDecl *RD = DeclType->castAs<RecordType>()->getDecl();
1268 auto Bases =
1269 CXXRecordDecl::base_class_range(CXXRecordDecl::base_class_iterator(),
1270 CXXRecordDecl::base_class_iterator());
1271 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD))
1272 Bases = CXXRD->bases();
1273 CheckStructUnionTypes(Entity, IList, DeclType, Bases, RD->field_begin(),
1274 SubobjectIsDesignatorContext, Index, StructuredList,
1275 StructuredIndex, TopLevelObject);
1276 } else if (DeclType->isArrayType()) {
1277 llvm::APSInt Zero(
1278 SemaRef.Context.getTypeSize(SemaRef.Context.getSizeType()),
1279 false);
1280 CheckArrayType(Entity, IList, DeclType, Zero,
1281 SubobjectIsDesignatorContext, Index,
1282 StructuredList, StructuredIndex);
1283 } else if (DeclType->isVoidType() || DeclType->isFunctionType()) {
1284 // This type is invalid, issue a diagnostic.
1285 ++Index;
1286 if (!VerifyOnly)
1287 SemaRef.Diag(IList->getBeginLoc(), diag::err_illegal_initializer_type)
1288 << DeclType;
1289 hadError = true;
1290 } else if (DeclType->isReferenceType()) {
1291 CheckReferenceType(Entity, IList, DeclType, Index,
1292 StructuredList, StructuredIndex);
1293 } else if (DeclType->isObjCObjectType()) {
1294 if (!VerifyOnly)
1295 SemaRef.Diag(IList->getBeginLoc(), diag::err_init_objc_class) << DeclType;
1296 hadError = true;
1297 } else if (DeclType->isOCLIntelSubgroupAVCType()) {
1298 // Checks for scalar type are sufficient for these types too.
1299 CheckScalarType(Entity, IList, DeclType, Index, StructuredList,
1300 StructuredIndex);
1301 } else {
1302 if (!VerifyOnly)
1303 SemaRef.Diag(IList->getBeginLoc(), diag::err_illegal_initializer_type)
1304 << DeclType;
1305 hadError = true;
1306 }
1307}
1308
1309void InitListChecker::CheckSubElementType(const InitializedEntity &Entity,
1310 InitListExpr *IList,
1311 QualType ElemType,
1312 unsigned &Index,
1313 InitListExpr *StructuredList,
1314 unsigned &StructuredIndex) {
1315 Expr *expr = IList->getInit(Index);
1316
1317 if (ElemType->isReferenceType())
1318 return CheckReferenceType(Entity, IList, ElemType, Index,
1319 StructuredList, StructuredIndex);
1320
1321 if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) {
1322 if (SubInitList->getNumInits() == 1 &&
1323 IsStringInit(SubInitList->getInit(0), ElemType, SemaRef.Context) ==
1324 SIF_None) {
1325 // FIXME: It would be more faithful and no less correct to include an
1326 // InitListExpr in the semantic form of the initializer list in this case.
1327 expr = SubInitList->getInit(0);
1328 }
1329 // Nested aggregate initialization and C++ initialization are handled later.
1330 } else if (isa<ImplicitValueInitExpr>(expr)) {
1331 // This happens during template instantiation when we see an InitListExpr
1332 // that we've already checked once.
1333 assert(SemaRef.Context.hasSameType(expr->getType(), ElemType) &&((SemaRef.Context.hasSameType(expr->getType(), ElemType) &&
"found implicit initialization for the wrong type") ? static_cast
<void> (0) : __assert_fail ("SemaRef.Context.hasSameType(expr->getType(), ElemType) && \"found implicit initialization for the wrong type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1334, __PRETTY_FUNCTION__))
1334 "found implicit initialization for the wrong type")((SemaRef.Context.hasSameType(expr->getType(), ElemType) &&
"found implicit initialization for the wrong type") ? static_cast
<void> (0) : __assert_fail ("SemaRef.Context.hasSameType(expr->getType(), ElemType) && \"found implicit initialization for the wrong type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1334, __PRETTY_FUNCTION__))
;
1335 UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
1336 ++Index;
1337 return;
1338 }
1339
1340 if (SemaRef.getLangOpts().CPlusPlus || isa<InitListExpr>(expr)) {
1341 // C++ [dcl.init.aggr]p2:
1342 // Each member is copy-initialized from the corresponding
1343 // initializer-clause.
1344
1345 // FIXME: Better EqualLoc?
1346 InitializationKind Kind =
1347 InitializationKind::CreateCopy(expr->getBeginLoc(), SourceLocation());
1348
1349 // Vector elements can be initialized from other vectors in which case
1350 // we need initialization entity with a type of a vector (and not a vector
1351 // element!) initializing multiple vector elements.
1352 auto TmpEntity =
1353 (ElemType->isExtVectorType() && !Entity.getType()->isExtVectorType())
1354 ? InitializedEntity::InitializeTemporary(ElemType)
1355 : Entity;
1356
1357 InitializationSequence Seq(SemaRef, TmpEntity, Kind, expr,
1358 /*TopLevelOfInitList*/ true);
1359
1360 // C++14 [dcl.init.aggr]p13:
1361 // If the assignment-expression can initialize a member, the member is
1362 // initialized. Otherwise [...] brace elision is assumed
1363 //
1364 // Brace elision is never performed if the element is not an
1365 // assignment-expression.
1366 if (Seq || isa<InitListExpr>(expr)) {
1367 if (!VerifyOnly) {
1368 ExprResult Result = Seq.Perform(SemaRef, TmpEntity, Kind, expr);
1369 if (Result.isInvalid())
1370 hadError = true;
1371
1372 UpdateStructuredListElement(StructuredList, StructuredIndex,
1373 Result.getAs<Expr>());
1374 } else if (!Seq) {
1375 hadError = true;
1376 } else if (StructuredList) {
1377 UpdateStructuredListElement(StructuredList, StructuredIndex,
1378 getDummyInit());
1379 }
1380 ++Index;
1381 return;
1382 }
1383
1384 // Fall through for subaggregate initialization
1385 } else if (ElemType->isScalarType() || ElemType->isAtomicType()) {
1386 // FIXME: Need to handle atomic aggregate types with implicit init lists.
1387 return CheckScalarType(Entity, IList, ElemType, Index,
1388 StructuredList, StructuredIndex);
1389 } else if (const ArrayType *arrayType =
1390 SemaRef.Context.getAsArrayType(ElemType)) {
1391 // arrayType can be incomplete if we're initializing a flexible
1392 // array member. There's nothing we can do with the completed
1393 // type here, though.
1394
1395 if (IsStringInit(expr, arrayType, SemaRef.Context) == SIF_None) {
1396 // FIXME: Should we do this checking in verify-only mode?
1397 if (!VerifyOnly)
1398 CheckStringInit(expr, ElemType, arrayType, SemaRef);
1399 if (StructuredList)
1400 UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
1401 ++Index;
1402 return;
1403 }
1404
1405 // Fall through for subaggregate initialization.
1406
1407 } else {
1408 assert((ElemType->isRecordType() || ElemType->isVectorType() ||(((ElemType->isRecordType() || ElemType->isVectorType()
|| ElemType->isOpenCLSpecificType()) && "Unexpected type"
) ? static_cast<void> (0) : __assert_fail ("(ElemType->isRecordType() || ElemType->isVectorType() || ElemType->isOpenCLSpecificType()) && \"Unexpected type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1409, __PRETTY_FUNCTION__))
1409 ElemType->isOpenCLSpecificType()) && "Unexpected type")(((ElemType->isRecordType() || ElemType->isVectorType()
|| ElemType->isOpenCLSpecificType()) && "Unexpected type"
) ? static_cast<void> (0) : __assert_fail ("(ElemType->isRecordType() || ElemType->isVectorType() || ElemType->isOpenCLSpecificType()) && \"Unexpected type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1409, __PRETTY_FUNCTION__))
;
1410
1411 // C99 6.7.8p13:
1412 //
1413 // The initializer for a structure or union object that has
1414 // automatic storage duration shall be either an initializer
1415 // list as described below, or a single expression that has
1416 // compatible structure or union type. In the latter case, the
1417 // initial value of the object, including unnamed members, is
1418 // that of the expression.
1419 ExprResult ExprRes = expr;
1420 if (SemaRef.CheckSingleAssignmentConstraints(
1421 ElemType, ExprRes, !VerifyOnly) != Sema::Incompatible) {
1422 if (ExprRes.isInvalid())
1423 hadError = true;
1424 else {
1425 ExprRes = SemaRef.DefaultFunctionArrayLvalueConversion(ExprRes.get());
1426 if (ExprRes.isInvalid())
1427 hadError = true;
1428 }
1429 UpdateStructuredListElement(StructuredList, StructuredIndex,
1430 ExprRes.getAs<Expr>());
1431 ++Index;
1432 return;
1433 }
1434 ExprRes.get();
1435 // Fall through for subaggregate initialization
1436 }
1437
1438 // C++ [dcl.init.aggr]p12:
1439 //
1440 // [...] Otherwise, if the member is itself a non-empty
1441 // subaggregate, brace elision is assumed and the initializer is
1442 // considered for the initialization of the first member of
1443 // the subaggregate.
1444 // OpenCL vector initializer is handled elsewhere.
1445 if ((!SemaRef.getLangOpts().OpenCL && ElemType->isVectorType()) ||
1446 ElemType->isAggregateType()) {
1447 CheckImplicitInitList(Entity, IList, ElemType, Index, StructuredList,
1448 StructuredIndex);
1449 ++StructuredIndex;
1450 } else {
1451 if (!VerifyOnly) {
1452 // We cannot initialize this element, so let PerformCopyInitialization
1453 // produce the appropriate diagnostic. We already checked that this
1454 // initialization will fail.
1455 ExprResult Copy =
1456 SemaRef.PerformCopyInitialization(Entity, SourceLocation(), expr,
1457 /*TopLevelOfInitList=*/true);
1458 (void)Copy;
1459 assert(Copy.isInvalid() &&((Copy.isInvalid() && "expected non-aggregate initialization to fail"
) ? static_cast<void> (0) : __assert_fail ("Copy.isInvalid() && \"expected non-aggregate initialization to fail\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1460, __PRETTY_FUNCTION__))
1460 "expected non-aggregate initialization to fail")((Copy.isInvalid() && "expected non-aggregate initialization to fail"
) ? static_cast<void> (0) : __assert_fail ("Copy.isInvalid() && \"expected non-aggregate initialization to fail\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1460, __PRETTY_FUNCTION__))
;
1461 }
1462 hadError = true;
1463 ++Index;
1464 ++StructuredIndex;
1465 }
1466}
1467
1468void InitListChecker::CheckComplexType(const InitializedEntity &Entity,
1469 InitListExpr *IList, QualType DeclType,
1470 unsigned &Index,
1471 InitListExpr *StructuredList,
1472 unsigned &StructuredIndex) {
1473 assert(Index == 0 && "Index in explicit init list must be zero")((Index == 0 && "Index in explicit init list must be zero"
) ? static_cast<void> (0) : __assert_fail ("Index == 0 && \"Index in explicit init list must be zero\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1473, __PRETTY_FUNCTION__))
;
1474
1475 // As an extension, clang supports complex initializers, which initialize
1476 // a complex number component-wise. When an explicit initializer list for
1477 // a complex number contains two two initializers, this extension kicks in:
1478 // it exepcts the initializer list to contain two elements convertible to
1479 // the element type of the complex type. The first element initializes
1480 // the real part, and the second element intitializes the imaginary part.
1481
1482 if (IList->getNumInits() != 2)
1483 return CheckScalarType(Entity, IList, DeclType, Index, StructuredList,
1484 StructuredIndex);
1485
1486 // This is an extension in C. (The builtin _Complex type does not exist
1487 // in the C++ standard.)
1488 if (!SemaRef.getLangOpts().CPlusPlus && !VerifyOnly)
1489 SemaRef.Diag(IList->getBeginLoc(), diag::ext_complex_component_init)
1490 << IList->getSourceRange();
1491
1492 // Initialize the complex number.
1493 QualType elementType = DeclType->castAs<ComplexType>()->getElementType();
1494 InitializedEntity ElementEntity =
1495 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
1496
1497 for (unsigned i = 0; i < 2; ++i) {
1498 ElementEntity.setElementIndex(Index);
1499 CheckSubElementType(ElementEntity, IList, elementType, Index,
1500 StructuredList, StructuredIndex);
1501 }
1502}
1503
1504void InitListChecker::CheckScalarType(const InitializedEntity &Entity,
1505 InitListExpr *IList, QualType DeclType,
1506 unsigned &Index,
1507 InitListExpr *StructuredList,
1508 unsigned &StructuredIndex) {
1509 if (Index >= IList->getNumInits()) {
1510 if (!VerifyOnly)
1511 SemaRef.Diag(IList->getBeginLoc(),
1512 SemaRef.getLangOpts().CPlusPlus11
1513 ? diag::warn_cxx98_compat_empty_scalar_initializer
1514 : diag::err_empty_scalar_initializer)
1515 << IList->getSourceRange();
1516 hadError = !SemaRef.getLangOpts().CPlusPlus11;
1517 ++Index;
1518 ++StructuredIndex;
1519 return;
1520 }
1521
1522 Expr *expr = IList->getInit(Index);
1523 if (InitListExpr *SubIList = dyn_cast<InitListExpr>(expr)) {
1524 // FIXME: This is invalid, and accepting it causes overload resolution
1525 // to pick the wrong overload in some corner cases.
1526 if (!VerifyOnly)
1527 SemaRef.Diag(SubIList->getBeginLoc(),
1528 diag::ext_many_braces_around_scalar_init)
1529 << SubIList->getSourceRange();
1530
1531 CheckScalarType(Entity, SubIList, DeclType, Index, StructuredList,
1532 StructuredIndex);
1533 return;
1534 } else if (isa<DesignatedInitExpr>(expr)) {
1535 if (!VerifyOnly)
1536 SemaRef.Diag(expr->getBeginLoc(), diag::err_designator_for_scalar_init)
1537 << DeclType << expr->getSourceRange();
1538 hadError = true;
1539 ++Index;
1540 ++StructuredIndex;
1541 return;
1542 }
1543
1544 ExprResult Result;
1545 if (VerifyOnly) {
1546 if (SemaRef.CanPerformCopyInitialization(Entity, expr))
1547 Result = getDummyInit();
1548 else
1549 Result = ExprError();
1550 } else {
1551 Result =
1552 SemaRef.PerformCopyInitialization(Entity, expr->getBeginLoc(), expr,
1553 /*TopLevelOfInitList=*/true);
1554 }
1555
1556 Expr *ResultExpr = nullptr;
1557
1558 if (Result.isInvalid())
1559 hadError = true; // types weren't compatible.
1560 else {
1561 ResultExpr = Result.getAs<Expr>();
1562
1563 if (ResultExpr != expr && !VerifyOnly) {
1564 // The type was promoted, update initializer list.
1565 // FIXME: Why are we updating the syntactic init list?
1566 IList->setInit(Index, ResultExpr);
1567 }
1568 }
1569 if (hadError)
1570 ++StructuredIndex;
1571 else
1572 UpdateStructuredListElement(StructuredList, StructuredIndex, ResultExpr);
1573 ++Index;
1574}
1575
1576void InitListChecker::CheckReferenceType(const InitializedEntity &Entity,
1577 InitListExpr *IList, QualType DeclType,
1578 unsigned &Index,
1579 InitListExpr *StructuredList,
1580 unsigned &StructuredIndex) {
1581 if (Index >= IList->getNumInits()) {
1582 // FIXME: It would be wonderful if we could point at the actual member. In
1583 // general, it would be useful to pass location information down the stack,
1584 // so that we know the location (or decl) of the "current object" being
1585 // initialized.
1586 if (!VerifyOnly)
1587 SemaRef.Diag(IList->getBeginLoc(),
1588 diag::err_init_reference_member_uninitialized)
1589 << DeclType << IList->getSourceRange();
1590 hadError = true;
1591 ++Index;
1592 ++StructuredIndex;
1593 return;
1594 }
1595
1596 Expr *expr = IList->getInit(Index);
1597 if (isa<InitListExpr>(expr) && !SemaRef.getLangOpts().CPlusPlus11) {
1598 if (!VerifyOnly)
1599 SemaRef.Diag(IList->getBeginLoc(), diag::err_init_non_aggr_init_list)
1600 << DeclType << IList->getSourceRange();
1601 hadError = true;
1602 ++Index;
1603 ++StructuredIndex;
1604 return;
1605 }
1606
1607 ExprResult Result;
1608 if (VerifyOnly) {
1609 if (SemaRef.CanPerformCopyInitialization(Entity,expr))
1610 Result = getDummyInit();
1611 else
1612 Result = ExprError();
1613 } else {
1614 Result =
1615 SemaRef.PerformCopyInitialization(Entity, expr->getBeginLoc(), expr,
1616 /*TopLevelOfInitList=*/true);
1617 }
1618
1619 if (Result.isInvalid())
1620 hadError = true;
1621
1622 expr = Result.getAs<Expr>();
1623 // FIXME: Why are we updating the syntactic init list?
1624 if (!VerifyOnly)
1625 IList->setInit(Index, expr);
1626
1627 if (hadError)
1628 ++StructuredIndex;
1629 else
1630 UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
1631 ++Index;
1632}
1633
1634void InitListChecker::CheckVectorType(const InitializedEntity &Entity,
1635 InitListExpr *IList, QualType DeclType,
1636 unsigned &Index,
1637 InitListExpr *StructuredList,
1638 unsigned &StructuredIndex) {
1639 const VectorType *VT = DeclType->castAs<VectorType>();
1640 unsigned maxElements = VT->getNumElements();
1641 unsigned numEltsInit = 0;
1642 QualType elementType = VT->getElementType();
1643
1644 if (Index >= IList->getNumInits()) {
1645 // Make sure the element type can be value-initialized.
1646 CheckEmptyInitializable(
1647 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity),
1648 IList->getEndLoc());
1649 return;
1650 }
1651
1652 if (!SemaRef.getLangOpts().OpenCL) {
1653 // If the initializing element is a vector, try to copy-initialize
1654 // instead of breaking it apart (which is doomed to failure anyway).
1655 Expr *Init = IList->getInit(Index);
1656 if (!isa<InitListExpr>(Init) && Init->getType()->isVectorType()) {
1657 ExprResult Result;
1658 if (VerifyOnly) {
1659 if (SemaRef.CanPerformCopyInitialization(Entity, Init))
1660 Result = getDummyInit();
1661 else
1662 Result = ExprError();
1663 } else {
1664 Result =
1665 SemaRef.PerformCopyInitialization(Entity, Init->getBeginLoc(), Init,
1666 /*TopLevelOfInitList=*/true);
1667 }
1668
1669 Expr *ResultExpr = nullptr;
1670 if (Result.isInvalid())
1671 hadError = true; // types weren't compatible.
1672 else {
1673 ResultExpr = Result.getAs<Expr>();
1674
1675 if (ResultExpr != Init && !VerifyOnly) {
1676 // The type was promoted, update initializer list.
1677 // FIXME: Why are we updating the syntactic init list?
1678 IList->setInit(Index, ResultExpr);
1679 }
1680 }
1681 if (hadError)
1682 ++StructuredIndex;
1683 else
1684 UpdateStructuredListElement(StructuredList, StructuredIndex,
1685 ResultExpr);
1686 ++Index;
1687 return;
1688 }
1689
1690 InitializedEntity ElementEntity =
1691 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
1692
1693 for (unsigned i = 0; i < maxElements; ++i, ++numEltsInit) {
1694 // Don't attempt to go past the end of the init list
1695 if (Index >= IList->getNumInits()) {
1696 CheckEmptyInitializable(ElementEntity, IList->getEndLoc());
1697 break;
1698 }
1699
1700 ElementEntity.setElementIndex(Index);
1701 CheckSubElementType(ElementEntity, IList, elementType, Index,
1702 StructuredList, StructuredIndex);
1703 }
1704
1705 if (VerifyOnly)
1706 return;
1707
1708 bool isBigEndian = SemaRef.Context.getTargetInfo().isBigEndian();
1709 const VectorType *T = Entity.getType()->castAs<VectorType>();
1710 if (isBigEndian && (T->getVectorKind() == VectorType::NeonVector ||
1711 T->getVectorKind() == VectorType::NeonPolyVector)) {
1712 // The ability to use vector initializer lists is a GNU vector extension
1713 // and is unrelated to the NEON intrinsics in arm_neon.h. On little
1714 // endian machines it works fine, however on big endian machines it
1715 // exhibits surprising behaviour:
1716 //
1717 // uint32x2_t x = {42, 64};
1718 // return vget_lane_u32(x, 0); // Will return 64.
1719 //
1720 // Because of this, explicitly call out that it is non-portable.
1721 //
1722 SemaRef.Diag(IList->getBeginLoc(),
1723 diag::warn_neon_vector_initializer_non_portable);
1724
1725 const char *typeCode;
1726 unsigned typeSize = SemaRef.Context.getTypeSize(elementType);
1727
1728 if (elementType->isFloatingType())
1729 typeCode = "f";
1730 else if (elementType->isSignedIntegerType())
1731 typeCode = "s";
1732 else if (elementType->isUnsignedIntegerType())
1733 typeCode = "u";
1734 else
1735 llvm_unreachable("Invalid element type!")::llvm::llvm_unreachable_internal("Invalid element type!", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 1735)
;
1736
1737 SemaRef.Diag(IList->getBeginLoc(),
1738 SemaRef.Context.getTypeSize(VT) > 64
1739 ? diag::note_neon_vector_initializer_non_portable_q
1740 : diag::note_neon_vector_initializer_non_portable)
1741 << typeCode << typeSize;
1742 }
1743
1744 return;
1745 }
1746
1747 InitializedEntity ElementEntity =
1748 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
1749
1750 // OpenCL initializers allows vectors to be constructed from vectors.
1751 for (unsigned i = 0; i < maxElements; ++i) {
1752 // Don't attempt to go past the end of the init list
1753 if (Index >= IList->getNumInits())
1754 break;
1755
1756 ElementEntity.setElementIndex(Index);
1757
1758 QualType IType = IList->getInit(Index)->getType();
1759 if (!IType->isVectorType()) {
1760 CheckSubElementType(ElementEntity, IList, elementType, Index,
1761 StructuredList, StructuredIndex);
1762 ++numEltsInit;
1763 } else {
1764 QualType VecType;
1765 const VectorType *IVT = IType->castAs<VectorType>();
1766 unsigned numIElts = IVT->getNumElements();
1767
1768 if (IType->isExtVectorType())
1769 VecType = SemaRef.Context.getExtVectorType(elementType, numIElts);
1770 else
1771 VecType = SemaRef.Context.getVectorType(elementType, numIElts,
1772 IVT->getVectorKind());
1773 CheckSubElementType(ElementEntity, IList, VecType, Index,
1774 StructuredList, StructuredIndex);
1775 numEltsInit += numIElts;
1776 }
1777 }
1778
1779 // OpenCL requires all elements to be initialized.
1780 if (numEltsInit != maxElements) {
1781 if (!VerifyOnly)
1782 SemaRef.Diag(IList->getBeginLoc(),
1783 diag::err_vector_incorrect_num_initializers)
1784 << (numEltsInit < maxElements) << maxElements << numEltsInit;
1785 hadError = true;
1786 }
1787}
1788
1789/// Check if the type of a class element has an accessible destructor, and marks
1790/// it referenced. Returns true if we shouldn't form a reference to the
1791/// destructor.
1792///
1793/// Aggregate initialization requires a class element's destructor be
1794/// accessible per 11.6.1 [dcl.init.aggr]:
1795///
1796/// The destructor for each element of class type is potentially invoked
1797/// (15.4 [class.dtor]) from the context where the aggregate initialization
1798/// occurs.
1799static bool checkDestructorReference(QualType ElementType, SourceLocation Loc,
1800 Sema &SemaRef) {
1801 auto *CXXRD = ElementType->getAsCXXRecordDecl();
1802 if (!CXXRD)
1803 return false;
1804
1805 CXXDestructorDecl *Destructor = SemaRef.LookupDestructor(CXXRD);
1806 SemaRef.CheckDestructorAccess(Loc, Destructor,
1807 SemaRef.PDiag(diag::err_access_dtor_temp)
1808 << ElementType);
1809 SemaRef.MarkFunctionReferenced(Loc, Destructor);
1810 return SemaRef.DiagnoseUseOfDecl(Destructor, Loc);
1811}
1812
1813void InitListChecker::CheckArrayType(const InitializedEntity &Entity,
1814 InitListExpr *IList, QualType &DeclType,
1815 llvm::APSInt elementIndex,
1816 bool SubobjectIsDesignatorContext,
1817 unsigned &Index,
1818 InitListExpr *StructuredList,
1819 unsigned &StructuredIndex) {
1820 const ArrayType *arrayType = SemaRef.Context.getAsArrayType(DeclType);
1821
1822 if (!VerifyOnly) {
1823 if (checkDestructorReference(arrayType->getElementType(),
1824 IList->getEndLoc(), SemaRef)) {
1825 hadError = true;
1826 return;
1827 }
1828 }
1829
1830 // Check for the special-case of initializing an array with a string.
1831 if (Index < IList->getNumInits()) {
1832 if (IsStringInit(IList->getInit(Index), arrayType, SemaRef.Context) ==
1833 SIF_None) {
1834 // We place the string literal directly into the resulting
1835 // initializer list. This is the only place where the structure
1836 // of the structured initializer list doesn't match exactly,
1837 // because doing so would involve allocating one character
1838 // constant for each string.
1839 // FIXME: Should we do these checks in verify-only mode too?
1840 if (!VerifyOnly)
1841 CheckStringInit(IList->getInit(Index), DeclType, arrayType, SemaRef);
1842 if (StructuredList) {
1843 UpdateStructuredListElement(StructuredList, StructuredIndex,
1844 IList->getInit(Index));
1845 StructuredList->resizeInits(SemaRef.Context, StructuredIndex);
1846 }
1847 ++Index;
1848 return;
1849 }
1850 }
1851 if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(arrayType)) {
1852 // Check for VLAs; in standard C it would be possible to check this
1853 // earlier, but I don't know where clang accepts VLAs (gcc accepts
1854 // them in all sorts of strange places).
1855 if (!VerifyOnly)
1856 SemaRef.Diag(VAT->getSizeExpr()->getBeginLoc(),
1857 diag::err_variable_object_no_init)
1858 << VAT->getSizeExpr()->getSourceRange();
1859 hadError = true;
1860 ++Index;
1861 ++StructuredIndex;
1862 return;
1863 }
1864
1865 // We might know the maximum number of elements in advance.
1866 llvm::APSInt maxElements(elementIndex.getBitWidth(),
1867 elementIndex.isUnsigned());
1868 bool maxElementsKnown = false;
1869 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(arrayType)) {
1870 maxElements = CAT->getSize();
1871 elementIndex = elementIndex.extOrTrunc(maxElements.getBitWidth());
1872 elementIndex.setIsUnsigned(maxElements.isUnsigned());
1873 maxElementsKnown = true;
1874 }
1875
1876 QualType elementType = arrayType->getElementType();
1877 while (Index < IList->getNumInits()) {
1878 Expr *Init = IList->getInit(Index);
1879 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
1880 // If we're not the subobject that matches up with the '{' for
1881 // the designator, we shouldn't be handling the
1882 // designator. Return immediately.
1883 if (!SubobjectIsDesignatorContext)
1884 return;
1885
1886 // Handle this designated initializer. elementIndex will be
1887 // updated to be the next array element we'll initialize.
1888 if (CheckDesignatedInitializer(Entity, IList, DIE, 0,
1889 DeclType, nullptr, &elementIndex, Index,
1890 StructuredList, StructuredIndex, true,
1891 false)) {
1892 hadError = true;
1893 continue;
1894 }
1895
1896 if (elementIndex.getBitWidth() > maxElements.getBitWidth())
1897 maxElements = maxElements.extend(elementIndex.getBitWidth());
1898 else if (elementIndex.getBitWidth() < maxElements.getBitWidth())
1899 elementIndex = elementIndex.extend(maxElements.getBitWidth());
1900 elementIndex.setIsUnsigned(maxElements.isUnsigned());
1901
1902 // If the array is of incomplete type, keep track of the number of
1903 // elements in the initializer.
1904 if (!maxElementsKnown && elementIndex > maxElements)
1905 maxElements = elementIndex;
1906
1907 continue;
1908 }
1909
1910 // If we know the maximum number of elements, and we've already
1911 // hit it, stop consuming elements in the initializer list.
1912 if (maxElementsKnown && elementIndex == maxElements)
1913 break;
1914
1915 InitializedEntity ElementEntity =
1916 InitializedEntity::InitializeElement(SemaRef.Context, StructuredIndex,
1917 Entity);
1918 // Check this element.
1919 CheckSubElementType(ElementEntity, IList, elementType, Index,
1920 StructuredList, StructuredIndex);
1921 ++elementIndex;
1922
1923 // If the array is of incomplete type, keep track of the number of
1924 // elements in the initializer.
1925 if (!maxElementsKnown && elementIndex > maxElements)
1926 maxElements = elementIndex;
1927 }
1928 if (!hadError && DeclType->isIncompleteArrayType() && !VerifyOnly) {
1929 // If this is an incomplete array type, the actual type needs to
1930 // be calculated here.
1931 llvm::APSInt Zero(maxElements.getBitWidth(), maxElements.isUnsigned());
1932 if (maxElements == Zero && !Entity.isVariableLengthArrayNew()) {
1933 // Sizing an array implicitly to zero is not allowed by ISO C,
1934 // but is supported by GNU.
1935 SemaRef.Diag(IList->getBeginLoc(), diag::ext_typecheck_zero_array_size);
1936 }
1937
1938 DeclType = SemaRef.Context.getConstantArrayType(
1939 elementType, maxElements, nullptr, ArrayType::Normal, 0);
1940 }
1941 if (!hadError) {
1942 // If there are any members of the array that get value-initialized, check
1943 // that is possible. That happens if we know the bound and don't have
1944 // enough elements, or if we're performing an array new with an unknown
1945 // bound.
1946 if ((maxElementsKnown && elementIndex < maxElements) ||
1947 Entity.isVariableLengthArrayNew())
1948 CheckEmptyInitializable(
1949 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity),
1950 IList->getEndLoc());
1951 }
1952}
1953
1954bool InitListChecker::CheckFlexibleArrayInit(const InitializedEntity &Entity,
1955 Expr *InitExpr,
1956 FieldDecl *Field,
1957 bool TopLevelObject) {
1958 // Handle GNU flexible array initializers.
1959 unsigned FlexArrayDiag;
1960 if (isa<InitListExpr>(InitExpr) &&
1961 cast<InitListExpr>(InitExpr)->getNumInits() == 0) {
1962 // Empty flexible array init always allowed as an extension
1963 FlexArrayDiag = diag::ext_flexible_array_init;
1964 } else if (SemaRef.getLangOpts().CPlusPlus) {
1965 // Disallow flexible array init in C++; it is not required for gcc
1966 // compatibility, and it needs work to IRGen correctly in general.
1967 FlexArrayDiag = diag::err_flexible_array_init;
1968 } else if (!TopLevelObject) {
1969 // Disallow flexible array init on non-top-level object
1970 FlexArrayDiag = diag::err_flexible_array_init;
1971 } else if (Entity.getKind() != InitializedEntity::EK_Variable) {
1972 // Disallow flexible array init on anything which is not a variable.
1973 FlexArrayDiag = diag::err_flexible_array_init;
1974 } else if (cast<VarDecl>(Entity.getDecl())->hasLocalStorage()) {
1975 // Disallow flexible array init on local variables.
1976 FlexArrayDiag = diag::err_flexible_array_init;
1977 } else {
1978 // Allow other cases.
1979 FlexArrayDiag = diag::ext_flexible_array_init;
1980 }
1981
1982 if (!VerifyOnly) {
1983 SemaRef.Diag(InitExpr->getBeginLoc(), FlexArrayDiag)
1984 << InitExpr->getBeginLoc();
1985 SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
1986 << Field;
1987 }
1988
1989 return FlexArrayDiag != diag::ext_flexible_array_init;
1990}
1991
1992void InitListChecker::CheckStructUnionTypes(
1993 const InitializedEntity &Entity, InitListExpr *IList, QualType DeclType,
1994 CXXRecordDecl::base_class_range Bases, RecordDecl::field_iterator Field,
1995 bool SubobjectIsDesignatorContext, unsigned &Index,
1996 InitListExpr *StructuredList, unsigned &StructuredIndex,
1997 bool TopLevelObject) {
1998 RecordDecl *structDecl = DeclType->castAs<RecordType>()->getDecl();
1999
2000 // If the record is invalid, some of it's members are invalid. To avoid
2001 // confusion, we forgo checking the intializer for the entire record.
2002 if (structDecl->isInvalidDecl()) {
2003 // Assume it was supposed to consume a single initializer.
2004 ++Index;
2005 hadError = true;
2006 return;
2007 }
2008
2009 if (DeclType->isUnionType() && IList->getNumInits() == 0) {
2010 RecordDecl *RD = DeclType->castAs<RecordType>()->getDecl();
2011
2012 if (!VerifyOnly)
2013 for (FieldDecl *FD : RD->fields()) {
2014 QualType ET = SemaRef.Context.getBaseElementType(FD->getType());
2015 if (checkDestructorReference(ET, IList->getEndLoc(), SemaRef)) {
2016 hadError = true;
2017 return;
2018 }
2019 }
2020
2021 // If there's a default initializer, use it.
2022 if (isa<CXXRecordDecl>(RD) &&
2023 cast<CXXRecordDecl>(RD)->hasInClassInitializer()) {
2024 if (!StructuredList)
2025 return;
2026 for (RecordDecl::field_iterator FieldEnd = RD->field_end();
2027 Field != FieldEnd; ++Field) {
2028 if (Field->hasInClassInitializer()) {
2029 StructuredList->setInitializedFieldInUnion(*Field);
2030 // FIXME: Actually build a CXXDefaultInitExpr?
2031 return;
2032 }
2033 }
2034 }
2035
2036 // Value-initialize the first member of the union that isn't an unnamed
2037 // bitfield.
2038 for (RecordDecl::field_iterator FieldEnd = RD->field_end();
2039 Field != FieldEnd; ++Field) {
2040 if (!Field->isUnnamedBitfield()) {
2041 CheckEmptyInitializable(
2042 InitializedEntity::InitializeMember(*Field, &Entity),
2043 IList->getEndLoc());
2044 if (StructuredList)
2045 StructuredList->setInitializedFieldInUnion(*Field);
2046 break;
2047 }
2048 }
2049 return;
2050 }
2051
2052 bool InitializedSomething = false;
2053
2054 // If we have any base classes, they are initialized prior to the fields.
2055 for (auto &Base : Bases) {
2056 Expr *Init = Index < IList->getNumInits() ? IList->getInit(Index) : nullptr;
2057
2058 // Designated inits always initialize fields, so if we see one, all
2059 // remaining base classes have no explicit initializer.
2060 if (Init && isa<DesignatedInitExpr>(Init))
2061 Init = nullptr;
2062
2063 SourceLocation InitLoc = Init ? Init->getBeginLoc() : IList->getEndLoc();
2064 InitializedEntity BaseEntity = InitializedEntity::InitializeBase(
2065 SemaRef.Context, &Base, false, &Entity);
2066 if (Init) {
2067 CheckSubElementType(BaseEntity, IList, Base.getType(), Index,
2068 StructuredList, StructuredIndex);
2069 InitializedSomething = true;
2070 } else {
2071 CheckEmptyInitializable(BaseEntity, InitLoc);
2072 }
2073
2074 if (!VerifyOnly)
2075 if (checkDestructorReference(Base.getType(), InitLoc, SemaRef)) {
2076 hadError = true;
2077 return;
2078 }
2079 }
2080
2081 // If structDecl is a forward declaration, this loop won't do
2082 // anything except look at designated initializers; That's okay,
2083 // because an error should get printed out elsewhere. It might be
2084 // worthwhile to skip over the rest of the initializer, though.
2085 RecordDecl *RD = DeclType->castAs<RecordType>()->getDecl();
2086 RecordDecl::field_iterator FieldEnd = RD->field_end();
2087 bool CheckForMissingFields =
2088 !IList->isIdiomaticZeroInitializer(SemaRef.getLangOpts());
2089 bool HasDesignatedInit = false;
2090
2091 while (Index < IList->getNumInits()) {
2092 Expr *Init = IList->getInit(Index);
2093 SourceLocation InitLoc = Init->getBeginLoc();
2094
2095 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
2096 // If we're not the subobject that matches up with the '{' for
2097 // the designator, we shouldn't be handling the
2098 // designator. Return immediately.
2099 if (!SubobjectIsDesignatorContext)
2100 return;
2101
2102 HasDesignatedInit = true;
2103
2104 // Handle this designated initializer. Field will be updated to
2105 // the next field that we'll be initializing.
2106 if (CheckDesignatedInitializer(Entity, IList, DIE, 0,
2107 DeclType, &Field, nullptr, Index,
2108 StructuredList, StructuredIndex,
2109 true, TopLevelObject))
2110 hadError = true;
2111 else if (!VerifyOnly) {
2112 // Find the field named by the designated initializer.
2113 RecordDecl::field_iterator F = RD->field_begin();
2114 while (std::next(F) != Field)
2115 ++F;
2116 QualType ET = SemaRef.Context.getBaseElementType(F->getType());
2117 if (checkDestructorReference(ET, InitLoc, SemaRef)) {
2118 hadError = true;
2119 return;
2120 }
2121 }
2122
2123 InitializedSomething = true;
2124
2125 // Disable check for missing fields when designators are used.
2126 // This matches gcc behaviour.
2127 CheckForMissingFields = false;
2128 continue;
2129 }
2130
2131 if (Field == FieldEnd) {
2132 // We've run out of fields. We're done.
2133 break;
2134 }
2135
2136 // We've already initialized a member of a union. We're done.
2137 if (InitializedSomething && DeclType->isUnionType())
2138 break;
2139
2140 // If we've hit the flexible array member at the end, we're done.
2141 if (Field->getType()->isIncompleteArrayType())
2142 break;
2143
2144 if (Field->isUnnamedBitfield()) {
2145 // Don't initialize unnamed bitfields, e.g. "int : 20;"
2146 ++Field;
2147 continue;
2148 }
2149
2150 // Make sure we can use this declaration.
2151 bool InvalidUse;
2152 if (VerifyOnly)
2153 InvalidUse = !SemaRef.CanUseDecl(*Field, TreatUnavailableAsInvalid);
2154 else
2155 InvalidUse = SemaRef.DiagnoseUseOfDecl(
2156 *Field, IList->getInit(Index)->getBeginLoc());
2157 if (InvalidUse) {
2158 ++Index;
2159 ++Field;
2160 hadError = true;
2161 continue;
2162 }
2163
2164 if (!VerifyOnly) {
2165 QualType ET = SemaRef.Context.getBaseElementType(Field->getType());
2166 if (checkDestructorReference(ET, InitLoc, SemaRef)) {
2167 hadError = true;
2168 return;
2169 }
2170 }
2171
2172 InitializedEntity MemberEntity =
2173 InitializedEntity::InitializeMember(*Field, &Entity);
2174 CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
2175 StructuredList, StructuredIndex);
2176 InitializedSomething = true;
2177
2178 if (DeclType->isUnionType() && StructuredList) {
2179 // Initialize the first field within the union.
2180 StructuredList->setInitializedFieldInUnion(*Field);
2181 }
2182
2183 ++Field;
2184 }
2185
2186 // Emit warnings for missing struct field initializers.
2187 if (!VerifyOnly && InitializedSomething && CheckForMissingFields &&
2188 Field != FieldEnd && !Field->getType()->isIncompleteArrayType() &&
2189 !DeclType->isUnionType()) {
2190 // It is possible we have one or more unnamed bitfields remaining.
2191 // Find first (if any) named field and emit warning.
2192 for (RecordDecl::field_iterator it = Field, end = RD->field_end();
2193 it != end; ++it) {
2194 if (!it->isUnnamedBitfield() && !it->hasInClassInitializer()) {
2195 SemaRef.Diag(IList->getSourceRange().getEnd(),
2196 diag::warn_missing_field_initializers) << *it;
2197 break;
2198 }
2199 }
2200 }
2201
2202 // Check that any remaining fields can be value-initialized if we're not
2203 // building a structured list. (If we are, we'll check this later.)
2204 if (!StructuredList && Field != FieldEnd && !DeclType->isUnionType() &&
2205 !Field->getType()->isIncompleteArrayType()) {
2206 for (; Field != FieldEnd && !hadError; ++Field) {
2207 if (!Field->isUnnamedBitfield() && !Field->hasInClassInitializer())
2208 CheckEmptyInitializable(
2209 InitializedEntity::InitializeMember(*Field, &Entity),
2210 IList->getEndLoc());
2211 }
2212 }
2213
2214 // Check that the types of the remaining fields have accessible destructors.
2215 if (!VerifyOnly) {
2216 // If the initializer expression has a designated initializer, check the
2217 // elements for which a designated initializer is not provided too.
2218 RecordDecl::field_iterator I = HasDesignatedInit ? RD->field_begin()
2219 : Field;
2220 for (RecordDecl::field_iterator E = RD->field_end(); I != E; ++I) {
2221 QualType ET = SemaRef.Context.getBaseElementType(I->getType());
2222 if (checkDestructorReference(ET, IList->getEndLoc(), SemaRef)) {
2223 hadError = true;
2224 return;
2225 }
2226 }
2227 }
2228
2229 if (Field == FieldEnd || !Field->getType()->isIncompleteArrayType() ||
2230 Index >= IList->getNumInits())
2231 return;
2232
2233 if (CheckFlexibleArrayInit(Entity, IList->getInit(Index), *Field,
2234 TopLevelObject)) {
2235 hadError = true;
2236 ++Index;
2237 return;
2238 }
2239
2240 InitializedEntity MemberEntity =
2241 InitializedEntity::InitializeMember(*Field, &Entity);
2242
2243 if (isa<InitListExpr>(IList->getInit(Index)))
2244 CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
2245 StructuredList, StructuredIndex);
2246 else
2247 CheckImplicitInitList(MemberEntity, IList, Field->getType(), Index,
2248 StructuredList, StructuredIndex);
2249}
2250
2251/// Expand a field designator that refers to a member of an
2252/// anonymous struct or union into a series of field designators that
2253/// refers to the field within the appropriate subobject.
2254///
2255static void ExpandAnonymousFieldDesignator(Sema &SemaRef,
2256 DesignatedInitExpr *DIE,
2257 unsigned DesigIdx,
2258 IndirectFieldDecl *IndirectField) {
2259 typedef DesignatedInitExpr::Designator Designator;
2260
2261 // Build the replacement designators.
2262 SmallVector<Designator, 4> Replacements;
2263 for (IndirectFieldDecl::chain_iterator PI = IndirectField->chain_begin(),
2264 PE = IndirectField->chain_end(); PI != PE; ++PI) {
2265 if (PI + 1 == PE)
2266 Replacements.push_back(Designator((IdentifierInfo *)nullptr,
2267 DIE->getDesignator(DesigIdx)->getDotLoc(),
2268 DIE->getDesignator(DesigIdx)->getFieldLoc()));
2269 else
2270 Replacements.push_back(Designator((IdentifierInfo *)nullptr,
2271 SourceLocation(), SourceLocation()));
2272 assert(isa<FieldDecl>(*PI))((isa<FieldDecl>(*PI)) ? static_cast<void> (0) : __assert_fail
("isa<FieldDecl>(*PI)", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 2272, __PRETTY_FUNCTION__))
;
2273 Replacements.back().setField(cast<FieldDecl>(*PI));
2274 }
2275
2276 // Expand the current designator into the set of replacement
2277 // designators, so we have a full subobject path down to where the
2278 // member of the anonymous struct/union is actually stored.
2279 DIE->ExpandDesignator(SemaRef.Context, DesigIdx, &Replacements[0],
2280 &Replacements[0] + Replacements.size());
2281}
2282
2283static DesignatedInitExpr *CloneDesignatedInitExpr(Sema &SemaRef,
2284 DesignatedInitExpr *DIE) {
2285 unsigned NumIndexExprs = DIE->getNumSubExprs() - 1;
2286 SmallVector<Expr*, 4> IndexExprs(NumIndexExprs);
2287 for (unsigned I = 0; I < NumIndexExprs; ++I)
2288 IndexExprs[I] = DIE->getSubExpr(I + 1);
2289 return DesignatedInitExpr::Create(SemaRef.Context, DIE->designators(),
2290 IndexExprs,
2291 DIE->getEqualOrColonLoc(),
2292 DIE->usesGNUSyntax(), DIE->getInit());
2293}
2294
2295namespace {
2296
2297// Callback to only accept typo corrections that are for field members of
2298// the given struct or union.
2299class FieldInitializerValidatorCCC final : public CorrectionCandidateCallback {
2300 public:
2301 explicit FieldInitializerValidatorCCC(RecordDecl *RD)
2302 : Record(RD) {}
2303
2304 bool ValidateCandidate(const TypoCorrection &candidate) override {
2305 FieldDecl *FD = candidate.getCorrectionDeclAs<FieldDecl>();
2306 return FD && FD->getDeclContext()->getRedeclContext()->Equals(Record);
2307 }
2308
2309 std::unique_ptr<CorrectionCandidateCallback> clone() override {
2310 return std::make_unique<FieldInitializerValidatorCCC>(*this);
2311 }
2312
2313 private:
2314 RecordDecl *Record;
2315};
2316
2317} // end anonymous namespace
2318
2319/// Check the well-formedness of a C99 designated initializer.
2320///
2321/// Determines whether the designated initializer @p DIE, which
2322/// resides at the given @p Index within the initializer list @p
2323/// IList, is well-formed for a current object of type @p DeclType
2324/// (C99 6.7.8). The actual subobject that this designator refers to
2325/// within the current subobject is returned in either
2326/// @p NextField or @p NextElementIndex (whichever is appropriate).
2327///
2328/// @param IList The initializer list in which this designated
2329/// initializer occurs.
2330///
2331/// @param DIE The designated initializer expression.
2332///
2333/// @param DesigIdx The index of the current designator.
2334///
2335/// @param CurrentObjectType The type of the "current object" (C99 6.7.8p17),
2336/// into which the designation in @p DIE should refer.
2337///
2338/// @param NextField If non-NULL and the first designator in @p DIE is
2339/// a field, this will be set to the field declaration corresponding
2340/// to the field named by the designator. On input, this is expected to be
2341/// the next field that would be initialized in the absence of designation,
2342/// if the complete object being initialized is a struct.
2343///
2344/// @param NextElementIndex If non-NULL and the first designator in @p
2345/// DIE is an array designator or GNU array-range designator, this
2346/// will be set to the last index initialized by this designator.
2347///
2348/// @param Index Index into @p IList where the designated initializer
2349/// @p DIE occurs.
2350///
2351/// @param StructuredList The initializer list expression that
2352/// describes all of the subobject initializers in the order they'll
2353/// actually be initialized.
2354///
2355/// @returns true if there was an error, false otherwise.
2356bool
2357InitListChecker::CheckDesignatedInitializer(const InitializedEntity &Entity,
2358 InitListExpr *IList,
2359 DesignatedInitExpr *DIE,
2360 unsigned DesigIdx,
2361 QualType &CurrentObjectType,
2362 RecordDecl::field_iterator *NextField,
2363 llvm::APSInt *NextElementIndex,
2364 unsigned &Index,
2365 InitListExpr *StructuredList,
2366 unsigned &StructuredIndex,
2367 bool FinishSubobjectInit,
2368 bool TopLevelObject) {
2369 if (DesigIdx == DIE->size()) {
2370 // C++20 designated initialization can result in direct-list-initialization
2371 // of the designated subobject. This is the only way that we can end up
2372 // performing direct initialization as part of aggregate initialization, so
2373 // it needs special handling.
2374 if (DIE->isDirectInit()) {
2375 Expr *Init = DIE->getInit();
2376 assert(isa<InitListExpr>(Init) &&((isa<InitListExpr>(Init) && "designator result in direct non-list initialization?"
) ? static_cast<void> (0) : __assert_fail ("isa<InitListExpr>(Init) && \"designator result in direct non-list initialization?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 2377, __PRETTY_FUNCTION__))
2377 "designator result in direct non-list initialization?")((isa<InitListExpr>(Init) && "designator result in direct non-list initialization?"
) ? static_cast<void> (0) : __assert_fail ("isa<InitListExpr>(Init) && \"designator result in direct non-list initialization?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 2377, __PRETTY_FUNCTION__))
;
2378 InitializationKind Kind = InitializationKind::CreateDirectList(
2379 DIE->getBeginLoc(), Init->getBeginLoc(), Init->getEndLoc());
2380 InitializationSequence Seq(SemaRef, Entity, Kind, Init,
2381 /*TopLevelOfInitList*/ true);
2382 if (StructuredList) {
2383 ExprResult Result = VerifyOnly
2384 ? getDummyInit()
2385 : Seq.Perform(SemaRef, Entity, Kind, Init);
2386 UpdateStructuredListElement(StructuredList, StructuredIndex,
2387 Result.get());
2388 }
2389 ++Index;
2390 return !Seq;
2391 }
2392
2393 // Check the actual initialization for the designated object type.
2394 bool prevHadError = hadError;
2395
2396 // Temporarily remove the designator expression from the
2397 // initializer list that the child calls see, so that we don't try
2398 // to re-process the designator.
2399 unsigned OldIndex = Index;
2400 IList->setInit(OldIndex, DIE->getInit());
2401
2402 CheckSubElementType(Entity, IList, CurrentObjectType, Index,
2403 StructuredList, StructuredIndex);
2404
2405 // Restore the designated initializer expression in the syntactic
2406 // form of the initializer list.
2407 if (IList->getInit(OldIndex) != DIE->getInit())
2408 DIE->setInit(IList->getInit(OldIndex));
2409 IList->setInit(OldIndex, DIE);
2410
2411 return hadError && !prevHadError;
2412 }
2413
2414 DesignatedInitExpr::Designator *D = DIE->getDesignator(DesigIdx);
2415 bool IsFirstDesignator = (DesigIdx == 0);
2416 if (IsFirstDesignator ? FullyStructuredList : StructuredList) {
2417 // Determine the structural initializer list that corresponds to the
2418 // current subobject.
2419 if (IsFirstDesignator)
2420 StructuredList = FullyStructuredList;
2421 else {
2422 Expr *ExistingInit = StructuredIndex < StructuredList->getNumInits() ?
2423 StructuredList->getInit(StructuredIndex) : nullptr;
2424 if (!ExistingInit && StructuredList->hasArrayFiller())
2425 ExistingInit = StructuredList->getArrayFiller();
2426
2427 if (!ExistingInit)
2428 StructuredList = getStructuredSubobjectInit(
2429 IList, Index, CurrentObjectType, StructuredList, StructuredIndex,
2430 SourceRange(D->getBeginLoc(), DIE->getEndLoc()));
2431 else if (InitListExpr *Result = dyn_cast<InitListExpr>(ExistingInit))
2432 StructuredList = Result;
2433 else {
2434 // We are creating an initializer list that initializes the
2435 // subobjects of the current object, but there was already an
2436 // initialization that completely initialized the current
2437 // subobject, e.g., by a compound literal:
2438 //
2439 // struct X { int a, b; };
2440 // struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 };
2441 //
2442 // Here, xs[0].a == 1 and xs[0].b == 3, since the second,
2443 // designated initializer re-initializes only its current object
2444 // subobject [0].b.
2445 diagnoseInitOverride(ExistingInit,
2446 SourceRange(D->getBeginLoc(), DIE->getEndLoc()),
2447 /*FullyOverwritten=*/false);
2448
2449 if (!VerifyOnly) {
2450 if (DesignatedInitUpdateExpr *E =
2451 dyn_cast<DesignatedInitUpdateExpr>(ExistingInit))
2452 StructuredList = E->getUpdater();
2453 else {
2454 DesignatedInitUpdateExpr *DIUE = new (SemaRef.Context)
2455 DesignatedInitUpdateExpr(SemaRef.Context, D->getBeginLoc(),
2456 ExistingInit, DIE->getEndLoc());
2457 StructuredList->updateInit(SemaRef.Context, StructuredIndex, DIUE);
2458 StructuredList = DIUE->getUpdater();
2459 }
2460 } else {
2461 // We don't need to track the structured representation of a
2462 // designated init update of an already-fully-initialized object in
2463 // verify-only mode. The only reason we would need the structure is
2464 // to determine where the uninitialized "holes" are, and in this
2465 // case, we know there aren't any and we can't introduce any.
2466 StructuredList = nullptr;
2467 }
2468 }
2469 }
2470 }
2471
2472 if (D->isFieldDesignator()) {
2473 // C99 6.7.8p7:
2474 //
2475 // If a designator has the form
2476 //
2477 // . identifier
2478 //
2479 // then the current object (defined below) shall have
2480 // structure or union type and the identifier shall be the
2481 // name of a member of that type.
2482 const RecordType *RT = CurrentObjectType->getAs<RecordType>();
2483 if (!RT) {
2484 SourceLocation Loc = D->getDotLoc();
2485 if (Loc.isInvalid())
2486 Loc = D->getFieldLoc();
2487 if (!VerifyOnly)
2488 SemaRef.Diag(Loc, diag::err_field_designator_non_aggr)
2489 << SemaRef.getLangOpts().CPlusPlus << CurrentObjectType;
2490 ++Index;
2491 return true;
2492 }
2493
2494 FieldDecl *KnownField = D->getField();
2495 if (!KnownField) {
2496 IdentifierInfo *FieldName = D->getFieldName();
2497 DeclContext::lookup_result Lookup = RT->getDecl()->lookup(FieldName);
2498 for (NamedDecl *ND : Lookup) {
2499 if (auto *FD = dyn_cast<FieldDecl>(ND)) {
2500 KnownField = FD;
2501 break;
2502 }
2503 if (auto *IFD = dyn_cast<IndirectFieldDecl>(ND)) {
2504 // In verify mode, don't modify the original.
2505 if (VerifyOnly)
2506 DIE = CloneDesignatedInitExpr(SemaRef, DIE);
2507 ExpandAnonymousFieldDesignator(SemaRef, DIE, DesigIdx, IFD);
2508 D = DIE->getDesignator(DesigIdx);
2509 KnownField = cast<FieldDecl>(*IFD->chain_begin());
2510 break;
2511 }
2512 }
2513 if (!KnownField) {
2514 if (VerifyOnly) {
2515 ++Index;
2516 return true; // No typo correction when just trying this out.
2517 }
2518
2519 // Name lookup found something, but it wasn't a field.
2520 if (!Lookup.empty()) {
2521 SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_nonfield)
2522 << FieldName;
2523 SemaRef.Diag(Lookup.front()->getLocation(),
2524 diag::note_field_designator_found);
2525 ++Index;
2526 return true;
2527 }
2528
2529 // Name lookup didn't find anything.
2530 // Determine whether this was a typo for another field name.
2531 FieldInitializerValidatorCCC CCC(RT->getDecl());
2532 if (TypoCorrection Corrected = SemaRef.CorrectTypo(
2533 DeclarationNameInfo(FieldName, D->getFieldLoc()),
2534 Sema::LookupMemberName, /*Scope=*/nullptr, /*SS=*/nullptr, CCC,
2535 Sema::CTK_ErrorRecovery, RT->getDecl())) {
2536 SemaRef.diagnoseTypo(
2537 Corrected,
2538 SemaRef.PDiag(diag::err_field_designator_unknown_suggest)
2539 << FieldName << CurrentObjectType);
2540 KnownField = Corrected.getCorrectionDeclAs<FieldDecl>();
2541 hadError = true;
2542 } else {
2543 // Typo correction didn't find anything.
2544 SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_unknown)
2545 << FieldName << CurrentObjectType;
2546 ++Index;
2547 return true;
2548 }
2549 }
2550 }
2551
2552 unsigned NumBases = 0;
2553 if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
2554 NumBases = CXXRD->getNumBases();
2555
2556 unsigned FieldIndex = NumBases;
2557
2558 for (auto *FI : RT->getDecl()->fields()) {
2559 if (FI->isUnnamedBitfield())
2560 continue;
2561 if (declaresSameEntity(KnownField, FI)) {
2562 KnownField = FI;
2563 break;
2564 }
2565 ++FieldIndex;
2566 }
2567
2568 RecordDecl::field_iterator Field =
2569 RecordDecl::field_iterator(DeclContext::decl_iterator(KnownField));
2570
2571 // All of the fields of a union are located at the same place in
2572 // the initializer list.
2573 if (RT->getDecl()->isUnion()) {
2574 FieldIndex = 0;
2575 if (StructuredList) {
2576 FieldDecl *CurrentField = StructuredList->getInitializedFieldInUnion();
2577 if (CurrentField && !declaresSameEntity(CurrentField, *Field)) {
2578 assert(StructuredList->getNumInits() == 1((StructuredList->getNumInits() == 1 && "A union should never have more than one initializer!"
) ? static_cast<void> (0) : __assert_fail ("StructuredList->getNumInits() == 1 && \"A union should never have more than one initializer!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 2579, __PRETTY_FUNCTION__))
2579 && "A union should never have more than one initializer!")((StructuredList->getNumInits() == 1 && "A union should never have more than one initializer!"
) ? static_cast<void> (0) : __assert_fail ("StructuredList->getNumInits() == 1 && \"A union should never have more than one initializer!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 2579, __PRETTY_FUNCTION__))
;
2580
2581 Expr *ExistingInit = StructuredList->getInit(0);
2582 if (ExistingInit) {
2583 // We're about to throw away an initializer, emit warning.
2584 diagnoseInitOverride(
2585 ExistingInit, SourceRange(D->getBeginLoc(), DIE->getEndLoc()));
2586 }
2587
2588 // remove existing initializer
2589 StructuredList->resizeInits(SemaRef.Context, 0);
2590 StructuredList->setInitializedFieldInUnion(nullptr);
2591 }
2592
2593 StructuredList->setInitializedFieldInUnion(*Field);
2594 }
2595 }
2596
2597 // Make sure we can use this declaration.
2598 bool InvalidUse;
2599 if (VerifyOnly)
2600 InvalidUse = !SemaRef.CanUseDecl(*Field, TreatUnavailableAsInvalid);
2601 else
2602 InvalidUse = SemaRef.DiagnoseUseOfDecl(*Field, D->getFieldLoc());
2603 if (InvalidUse) {
2604 ++Index;
2605 return true;
2606 }
2607
2608 // C++20 [dcl.init.list]p3:
2609 // The ordered identifiers in the designators of the designated-
2610 // initializer-list shall form a subsequence of the ordered identifiers
2611 // in the direct non-static data members of T.
2612 //
2613 // Note that this is not a condition on forming the aggregate
2614 // initialization, only on actually performing initialization,
2615 // so it is not checked in VerifyOnly mode.
2616 //
2617 // FIXME: This is the only reordering diagnostic we produce, and it only
2618 // catches cases where we have a top-level field designator that jumps
2619 // backwards. This is the only such case that is reachable in an
2620 // otherwise-valid C++20 program, so is the only case that's required for
2621 // conformance, but for consistency, we should diagnose all the other
2622 // cases where a designator takes us backwards too.
2623 if (IsFirstDesignator && !VerifyOnly && SemaRef.getLangOpts().CPlusPlus &&
2624 NextField &&
2625 (*NextField == RT->getDecl()->field_end() ||
2626 (*NextField)->getFieldIndex() > Field->getFieldIndex() + 1)) {
2627 // Find the field that we just initialized.
2628 FieldDecl *PrevField = nullptr;
2629 for (auto FI = RT->getDecl()->field_begin();
2630 FI != RT->getDecl()->field_end(); ++FI) {
2631 if (FI->isUnnamedBitfield())
2632 continue;
2633 if (*NextField != RT->getDecl()->field_end() &&
2634 declaresSameEntity(*FI, **NextField))
2635 break;
2636 PrevField = *FI;
2637 }
2638
2639 if (PrevField &&
2640 PrevField->getFieldIndex() > KnownField->getFieldIndex()) {
2641 SemaRef.Diag(DIE->getBeginLoc(), diag::ext_designated_init_reordered)
2642 << KnownField << PrevField << DIE->getSourceRange();
2643
2644 unsigned OldIndex = NumBases + PrevField->getFieldIndex();
2645 if (StructuredList && OldIndex <= StructuredList->getNumInits()) {
2646 if (Expr *PrevInit = StructuredList->getInit(OldIndex)) {
2647 SemaRef.Diag(PrevInit->getBeginLoc(),
2648 diag::note_previous_field_init)
2649 << PrevField << PrevInit->getSourceRange();
2650 }
2651 }
2652 }
2653 }
2654
2655
2656 // Update the designator with the field declaration.
2657 if (!VerifyOnly)
2658 D->setField(*Field);
2659
2660 // Make sure that our non-designated initializer list has space
2661 // for a subobject corresponding to this field.
2662 if (StructuredList && FieldIndex >= StructuredList->getNumInits())
2663 StructuredList->resizeInits(SemaRef.Context, FieldIndex + 1);
2664
2665 // This designator names a flexible array member.
2666 if (Field->getType()->isIncompleteArrayType()) {
2667 bool Invalid = false;
2668 if ((DesigIdx + 1) != DIE->size()) {
2669 // We can't designate an object within the flexible array
2670 // member (because GCC doesn't allow it).
2671 if (!VerifyOnly) {
2672 DesignatedInitExpr::Designator *NextD
2673 = DIE->getDesignator(DesigIdx + 1);
2674 SemaRef.Diag(NextD->getBeginLoc(),
2675 diag::err_designator_into_flexible_array_member)
2676 << SourceRange(NextD->getBeginLoc(), DIE->getEndLoc());
2677 SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
2678 << *Field;
2679 }
2680 Invalid = true;
2681 }
2682
2683 if (!hadError && !isa<InitListExpr>(DIE->getInit()) &&
2684 !isa<StringLiteral>(DIE->getInit())) {
2685 // The initializer is not an initializer list.
2686 if (!VerifyOnly) {
2687 SemaRef.Diag(DIE->getInit()->getBeginLoc(),
2688 diag::err_flexible_array_init_needs_braces)
2689 << DIE->getInit()->getSourceRange();
2690 SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
2691 << *Field;
2692 }
2693 Invalid = true;
2694 }
2695
2696 // Check GNU flexible array initializer.
2697 if (!Invalid && CheckFlexibleArrayInit(Entity, DIE->getInit(), *Field,
2698 TopLevelObject))
2699 Invalid = true;
2700
2701 if (Invalid) {
2702 ++Index;
2703 return true;
2704 }
2705
2706 // Initialize the array.
2707 bool prevHadError = hadError;
2708 unsigned newStructuredIndex = FieldIndex;
2709 unsigned OldIndex = Index;
2710 IList->setInit(Index, DIE->getInit());
2711
2712 InitializedEntity MemberEntity =
2713 InitializedEntity::InitializeMember(*Field, &Entity);
2714 CheckSubElementType(MemberEntity, IList, Field->getType(), Index,
2715 StructuredList, newStructuredIndex);
2716
2717 IList->setInit(OldIndex, DIE);
2718 if (hadError && !prevHadError) {
2719 ++Field;
2720 ++FieldIndex;
2721 if (NextField)
2722 *NextField = Field;
2723 StructuredIndex = FieldIndex;
2724 return true;
2725 }
2726 } else {
2727 // Recurse to check later designated subobjects.
2728 QualType FieldType = Field->getType();
2729 unsigned newStructuredIndex = FieldIndex;
2730
2731 InitializedEntity MemberEntity =
2732 InitializedEntity::InitializeMember(*Field, &Entity);
2733 if (CheckDesignatedInitializer(MemberEntity, IList, DIE, DesigIdx + 1,
2734 FieldType, nullptr, nullptr, Index,
2735 StructuredList, newStructuredIndex,
2736 FinishSubobjectInit, false))
2737 return true;
2738 }
2739
2740 // Find the position of the next field to be initialized in this
2741 // subobject.
2742 ++Field;
2743 ++FieldIndex;
2744
2745 // If this the first designator, our caller will continue checking
2746 // the rest of this struct/class/union subobject.
2747 if (IsFirstDesignator) {
2748 if (NextField)
2749 *NextField = Field;
2750 StructuredIndex = FieldIndex;
2751 return false;
2752 }
2753
2754 if (!FinishSubobjectInit)
2755 return false;
2756
2757 // We've already initialized something in the union; we're done.
2758 if (RT->getDecl()->isUnion())
2759 return hadError;
2760
2761 // Check the remaining fields within this class/struct/union subobject.
2762 bool prevHadError = hadError;
2763
2764 auto NoBases =
2765 CXXRecordDecl::base_class_range(CXXRecordDecl::base_class_iterator(),
2766 CXXRecordDecl::base_class_iterator());
2767 CheckStructUnionTypes(Entity, IList, CurrentObjectType, NoBases, Field,
2768 false, Index, StructuredList, FieldIndex);
2769 return hadError && !prevHadError;
2770 }
2771
2772 // C99 6.7.8p6:
2773 //
2774 // If a designator has the form
2775 //
2776 // [ constant-expression ]
2777 //
2778 // then the current object (defined below) shall have array
2779 // type and the expression shall be an integer constant
2780 // expression. If the array is of unknown size, any
2781 // nonnegative value is valid.
2782 //
2783 // Additionally, cope with the GNU extension that permits
2784 // designators of the form
2785 //
2786 // [ constant-expression ... constant-expression ]
2787 const ArrayType *AT = SemaRef.Context.getAsArrayType(CurrentObjectType);
2788 if (!AT) {
2789 if (!VerifyOnly)
2790 SemaRef.Diag(D->getLBracketLoc(), diag::err_array_designator_non_array)
2791 << CurrentObjectType;
2792 ++Index;
2793 return true;
2794 }
2795
2796 Expr *IndexExpr = nullptr;
2797 llvm::APSInt DesignatedStartIndex, DesignatedEndIndex;
2798 if (D->isArrayDesignator()) {
2799 IndexExpr = DIE->getArrayIndex(*D);
2800 DesignatedStartIndex = IndexExpr->EvaluateKnownConstInt(SemaRef.Context);
2801 DesignatedEndIndex = DesignatedStartIndex;
2802 } else {
2803 assert(D->isArrayRangeDesignator() && "Need array-range designator")((D->isArrayRangeDesignator() && "Need array-range designator"
) ? static_cast<void> (0) : __assert_fail ("D->isArrayRangeDesignator() && \"Need array-range designator\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 2803, __PRETTY_FUNCTION__))
;
2804
2805 DesignatedStartIndex =
2806 DIE->getArrayRangeStart(*D)->EvaluateKnownConstInt(SemaRef.Context);
2807 DesignatedEndIndex =
2808 DIE->getArrayRangeEnd(*D)->EvaluateKnownConstInt(SemaRef.Context);
2809 IndexExpr = DIE->getArrayRangeEnd(*D);
2810
2811 // Codegen can't handle evaluating array range designators that have side
2812 // effects, because we replicate the AST value for each initialized element.
2813 // As such, set the sawArrayRangeDesignator() bit if we initialize multiple
2814 // elements with something that has a side effect, so codegen can emit an
2815 // "error unsupported" error instead of miscompiling the app.
2816 if (DesignatedStartIndex.getZExtValue()!=DesignatedEndIndex.getZExtValue()&&
2817 DIE->getInit()->HasSideEffects(SemaRef.Context) && !VerifyOnly)
2818 FullyStructuredList->sawArrayRangeDesignator();
2819 }
2820
2821 if (isa<ConstantArrayType>(AT)) {
2822 llvm::APSInt MaxElements(cast<ConstantArrayType>(AT)->getSize(), false);
2823 DesignatedStartIndex
2824 = DesignatedStartIndex.extOrTrunc(MaxElements.getBitWidth());
2825 DesignatedStartIndex.setIsUnsigned(MaxElements.isUnsigned());
2826 DesignatedEndIndex
2827 = DesignatedEndIndex.extOrTrunc(MaxElements.getBitWidth());
2828 DesignatedEndIndex.setIsUnsigned(MaxElements.isUnsigned());
2829 if (DesignatedEndIndex >= MaxElements) {
2830 if (!VerifyOnly)
2831 SemaRef.Diag(IndexExpr->getBeginLoc(),
2832 diag::err_array_designator_too_large)
2833 << DesignatedEndIndex.toString(10) << MaxElements.toString(10)
2834 << IndexExpr->getSourceRange();
2835 ++Index;
2836 return true;
2837 }
2838 } else {
2839 unsigned DesignatedIndexBitWidth =
2840 ConstantArrayType::getMaxSizeBits(SemaRef.Context);
2841 DesignatedStartIndex =
2842 DesignatedStartIndex.extOrTrunc(DesignatedIndexBitWidth);
2843 DesignatedEndIndex =
2844 DesignatedEndIndex.extOrTrunc(DesignatedIndexBitWidth);
2845 DesignatedStartIndex.setIsUnsigned(true);
2846 DesignatedEndIndex.setIsUnsigned(true);
2847 }
2848
2849 bool IsStringLiteralInitUpdate =
2850 StructuredList && StructuredList->isStringLiteralInit();
2851 if (IsStringLiteralInitUpdate && VerifyOnly) {
2852 // We're just verifying an update to a string literal init. We don't need
2853 // to split the string up into individual characters to do that.
2854 StructuredList = nullptr;
2855 } else if (IsStringLiteralInitUpdate) {
2856 // We're modifying a string literal init; we have to decompose the string
2857 // so we can modify the individual characters.
2858 ASTContext &Context = SemaRef.Context;
2859 Expr *SubExpr = StructuredList->getInit(0)->IgnoreParens();
2860
2861 // Compute the character type
2862 QualType CharTy = AT->getElementType();
2863
2864 // Compute the type of the integer literals.
2865 QualType PromotedCharTy = CharTy;
2866 if (CharTy->isPromotableIntegerType())
2867 PromotedCharTy = Context.getPromotedIntegerType(CharTy);
2868 unsigned PromotedCharTyWidth = Context.getTypeSize(PromotedCharTy);
2869
2870 if (StringLiteral *SL = dyn_cast<StringLiteral>(SubExpr)) {
2871 // Get the length of the string.
2872 uint64_t StrLen = SL->getLength();
2873 if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen))
2874 StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue();
2875 StructuredList->resizeInits(Context, StrLen);
2876
2877 // Build a literal for each character in the string, and put them into
2878 // the init list.
2879 for (unsigned i = 0, e = StrLen; i != e; ++i) {
2880 llvm::APInt CodeUnit(PromotedCharTyWidth, SL->getCodeUnit(i));
2881 Expr *Init = new (Context) IntegerLiteral(
2882 Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc());
2883 if (CharTy != PromotedCharTy)
2884 Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast,
2885 Init, nullptr, VK_RValue);
2886 StructuredList->updateInit(Context, i, Init);
2887 }
2888 } else {
2889 ObjCEncodeExpr *E = cast<ObjCEncodeExpr>(SubExpr);
2890 std::string Str;
2891 Context.getObjCEncodingForType(E->getEncodedType(), Str);
2892
2893 // Get the length of the string.
2894 uint64_t StrLen = Str.size();
2895 if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen))
2896 StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue();
2897 StructuredList->resizeInits(Context, StrLen);
2898
2899 // Build a literal for each character in the string, and put them into
2900 // the init list.
2901 for (unsigned i = 0, e = StrLen; i != e; ++i) {
2902 llvm::APInt CodeUnit(PromotedCharTyWidth, Str[i]);
2903 Expr *Init = new (Context) IntegerLiteral(
2904 Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc());
2905 if (CharTy != PromotedCharTy)
2906 Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast,
2907 Init, nullptr, VK_RValue);
2908 StructuredList->updateInit(Context, i, Init);
2909 }
2910 }
2911 }
2912
2913 // Make sure that our non-designated initializer list has space
2914 // for a subobject corresponding to this array element.
2915 if (StructuredList &&
2916 DesignatedEndIndex.getZExtValue() >= StructuredList->getNumInits())
2917 StructuredList->resizeInits(SemaRef.Context,
2918 DesignatedEndIndex.getZExtValue() + 1);
2919
2920 // Repeatedly perform subobject initializations in the range
2921 // [DesignatedStartIndex, DesignatedEndIndex].
2922
2923 // Move to the next designator
2924 unsigned ElementIndex = DesignatedStartIndex.getZExtValue();
2925 unsigned OldIndex = Index;
2926
2927 InitializedEntity ElementEntity =
2928 InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity);
2929
2930 while (DesignatedStartIndex <= DesignatedEndIndex) {
2931 // Recurse to check later designated subobjects.
2932 QualType ElementType = AT->getElementType();
2933 Index = OldIndex;
2934
2935 ElementEntity.setElementIndex(ElementIndex);
2936 if (CheckDesignatedInitializer(
2937 ElementEntity, IList, DIE, DesigIdx + 1, ElementType, nullptr,
2938 nullptr, Index, StructuredList, ElementIndex,
2939 FinishSubobjectInit && (DesignatedStartIndex == DesignatedEndIndex),
2940 false))
2941 return true;
2942
2943 // Move to the next index in the array that we'll be initializing.
2944 ++DesignatedStartIndex;
2945 ElementIndex = DesignatedStartIndex.getZExtValue();
2946 }
2947
2948 // If this the first designator, our caller will continue checking
2949 // the rest of this array subobject.
2950 if (IsFirstDesignator) {
2951 if (NextElementIndex)
2952 *NextElementIndex = DesignatedStartIndex;
2953 StructuredIndex = ElementIndex;
2954 return false;
2955 }
2956
2957 if (!FinishSubobjectInit)
2958 return false;
2959
2960 // Check the remaining elements within this array subobject.
2961 bool prevHadError = hadError;
2962 CheckArrayType(Entity, IList, CurrentObjectType, DesignatedStartIndex,
2963 /*SubobjectIsDesignatorContext=*/false, Index,
2964 StructuredList, ElementIndex);
2965 return hadError && !prevHadError;
2966}
2967
2968// Get the structured initializer list for a subobject of type
2969// @p CurrentObjectType.
2970InitListExpr *
2971InitListChecker::getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
2972 QualType CurrentObjectType,
2973 InitListExpr *StructuredList,
2974 unsigned StructuredIndex,
2975 SourceRange InitRange,
2976 bool IsFullyOverwritten) {
2977 if (!StructuredList)
2978 return nullptr;
2979
2980 Expr *ExistingInit = nullptr;
2981 if (StructuredIndex < StructuredList->getNumInits())
2982 ExistingInit = StructuredList->getInit(StructuredIndex);
2983
2984 if (InitListExpr *Result = dyn_cast_or_null<InitListExpr>(ExistingInit))
2985 // There might have already been initializers for subobjects of the current
2986 // object, but a subsequent initializer list will overwrite the entirety
2987 // of the current object. (See DR 253 and C99 6.7.8p21). e.g.,
2988 //
2989 // struct P { char x[6]; };
2990 // struct P l = { .x[2] = 'x', .x = { [0] = 'f' } };
2991 //
2992 // The first designated initializer is ignored, and l.x is just "f".
2993 if (!IsFullyOverwritten)
2994 return Result;
2995
2996 if (ExistingInit) {
2997 // We are creating an initializer list that initializes the
2998 // subobjects of the current object, but there was already an
2999 // initialization that completely initialized the current
3000 // subobject:
3001 //
3002 // struct X { int a, b; };
3003 // struct X xs[] = { [0] = { 1, 2 }, [0].b = 3 };
3004 //
3005 // Here, xs[0].a == 1 and xs[0].b == 3, since the second,
3006 // designated initializer overwrites the [0].b initializer
3007 // from the prior initialization.
3008 //
3009 // When the existing initializer is an expression rather than an
3010 // initializer list, we cannot decompose and update it in this way.
3011 // For example:
3012 //
3013 // struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 };
3014 //
3015 // This case is handled by CheckDesignatedInitializer.
3016 diagnoseInitOverride(ExistingInit, InitRange);
3017 }
3018
3019 unsigned ExpectedNumInits = 0;
3020 if (Index < IList->getNumInits()) {
3021 if (auto *Init = dyn_cast_or_null<InitListExpr>(IList->getInit(Index)))
3022 ExpectedNumInits = Init->getNumInits();
3023 else
3024 ExpectedNumInits = IList->getNumInits() - Index;
3025 }
3026
3027 InitListExpr *Result =
3028 createInitListExpr(CurrentObjectType, InitRange, ExpectedNumInits);
3029
3030 // Link this new initializer list into the structured initializer
3031 // lists.
3032 StructuredList->updateInit(SemaRef.Context, StructuredIndex, Result);
3033 return Result;
3034}
3035
3036InitListExpr *
3037InitListChecker::createInitListExpr(QualType CurrentObjectType,
3038 SourceRange InitRange,
3039 unsigned ExpectedNumInits) {
3040 InitListExpr *Result
3041 = new (SemaRef.Context) InitListExpr(SemaRef.Context,
3042 InitRange.getBegin(), None,
3043 InitRange.getEnd());
3044
3045 QualType ResultType = CurrentObjectType;
3046 if (!ResultType->isArrayType())
3047 ResultType = ResultType.getNonLValueExprType(SemaRef.Context);
3048 Result->setType(ResultType);
3049
3050 // Pre-allocate storage for the structured initializer list.
3051 unsigned NumElements = 0;
3052
3053 if (const ArrayType *AType
3054 = SemaRef.Context.getAsArrayType(CurrentObjectType)) {
3055 if (const ConstantArrayType *CAType = dyn_cast<ConstantArrayType>(AType)) {
3056 NumElements = CAType->getSize().getZExtValue();
3057 // Simple heuristic so that we don't allocate a very large
3058 // initializer with many empty entries at the end.
3059 if (NumElements > ExpectedNumInits)
3060 NumElements = 0;
3061 }
3062 } else if (const VectorType *VType = CurrentObjectType->getAs<VectorType>()) {
3063 NumElements = VType->getNumElements();
3064 } else if (CurrentObjectType->isRecordType()) {
3065 NumElements = numStructUnionElements(CurrentObjectType);
3066 }
3067
3068 Result->reserveInits(SemaRef.Context, NumElements);
3069
3070 return Result;
3071}
3072
3073/// Update the initializer at index @p StructuredIndex within the
3074/// structured initializer list to the value @p expr.
3075void InitListChecker::UpdateStructuredListElement(InitListExpr *StructuredList,
3076 unsigned &StructuredIndex,
3077 Expr *expr) {
3078 // No structured initializer list to update
3079 if (!StructuredList)
3080 return;
3081
3082 if (Expr *PrevInit = StructuredList->updateInit(SemaRef.Context,
3083 StructuredIndex, expr)) {
3084 // This initializer overwrites a previous initializer. Warn.
3085 diagnoseInitOverride(PrevInit, expr->getSourceRange());
3086 }
3087
3088 ++StructuredIndex;
3089}
3090
3091/// Determine whether we can perform aggregate initialization for the purposes
3092/// of overload resolution.
3093bool Sema::CanPerformAggregateInitializationForOverloadResolution(
3094 const InitializedEntity &Entity, InitListExpr *From) {
3095 QualType Type = Entity.getType();
3096 InitListChecker Check(*this, Entity, From, Type, /*VerifyOnly=*/true,
3097 /*TreatUnavailableAsInvalid=*/false,
3098 /*InOverloadResolution=*/true);
3099 return !Check.HadError();
3100}
3101
3102/// Check that the given Index expression is a valid array designator
3103/// value. This is essentially just a wrapper around
3104/// VerifyIntegerConstantExpression that also checks for negative values
3105/// and produces a reasonable diagnostic if there is a
3106/// failure. Returns the index expression, possibly with an implicit cast
3107/// added, on success. If everything went okay, Value will receive the
3108/// value of the constant expression.
3109static ExprResult
3110CheckArrayDesignatorExpr(Sema &S, Expr *Index, llvm::APSInt &Value) {
3111 SourceLocation Loc = Index->getBeginLoc();
3112
3113 // Make sure this is an integer constant expression.
3114 ExprResult Result = S.VerifyIntegerConstantExpression(Index, &Value);
3115 if (Result.isInvalid())
3116 return Result;
3117
3118 if (Value.isSigned() && Value.isNegative())
3119 return S.Diag(Loc, diag::err_array_designator_negative)
3120 << Value.toString(10) << Index->getSourceRange();
3121
3122 Value.setIsUnsigned(true);
3123 return Result;
3124}
3125
3126ExprResult Sema::ActOnDesignatedInitializer(Designation &Desig,
3127 SourceLocation EqualOrColonLoc,
3128 bool GNUSyntax,
3129 ExprResult Init) {
3130 typedef DesignatedInitExpr::Designator ASTDesignator;
3131
3132 bool Invalid = false;
3133 SmallVector<ASTDesignator, 32> Designators;
3134 SmallVector<Expr *, 32> InitExpressions;
3135
3136 // Build designators and check array designator expressions.
3137 for (unsigned Idx = 0; Idx < Desig.getNumDesignators(); ++Idx) {
3138 const Designator &D = Desig.getDesignator(Idx);
3139 switch (D.getKind()) {
3140 case Designator::FieldDesignator:
3141 Designators.push_back(ASTDesignator(D.getField(), D.getDotLoc(),
3142 D.getFieldLoc()));
3143 break;
3144
3145 case Designator::ArrayDesignator: {
3146 Expr *Index = static_cast<Expr *>(D.getArrayIndex());
3147 llvm::APSInt IndexValue;
3148 if (!Index->isTypeDependent() && !Index->isValueDependent())
3149 Index = CheckArrayDesignatorExpr(*this, Index, IndexValue).get();
3150 if (!Index)
3151 Invalid = true;
3152 else {
3153 Designators.push_back(ASTDesignator(InitExpressions.size(),
3154 D.getLBracketLoc(),
3155 D.getRBracketLoc()));
3156 InitExpressions.push_back(Index);
3157 }
3158 break;
3159 }
3160
3161 case Designator::ArrayRangeDesignator: {
3162 Expr *StartIndex = static_cast<Expr *>(D.getArrayRangeStart());
3163 Expr *EndIndex = static_cast<Expr *>(D.getArrayRangeEnd());
3164 llvm::APSInt StartValue;
3165 llvm::APSInt EndValue;
3166 bool StartDependent = StartIndex->isTypeDependent() ||
3167 StartIndex->isValueDependent();
3168 bool EndDependent = EndIndex->isTypeDependent() ||
3169 EndIndex->isValueDependent();
3170 if (!StartDependent)
3171 StartIndex =
3172 CheckArrayDesignatorExpr(*this, StartIndex, StartValue).get();
3173 if (!EndDependent)
3174 EndIndex = CheckArrayDesignatorExpr(*this, EndIndex, EndValue).get();
3175
3176 if (!StartIndex || !EndIndex)
3177 Invalid = true;
3178 else {
3179 // Make sure we're comparing values with the same bit width.
3180 if (StartDependent || EndDependent) {
3181 // Nothing to compute.
3182 } else if (StartValue.getBitWidth() > EndValue.getBitWidth())
3183 EndValue = EndValue.extend(StartValue.getBitWidth());
3184 else if (StartValue.getBitWidth() < EndValue.getBitWidth())
3185 StartValue = StartValue.extend(EndValue.getBitWidth());
3186
3187 if (!StartDependent && !EndDependent && EndValue < StartValue) {
3188 Diag(D.getEllipsisLoc(), diag::err_array_designator_empty_range)
3189 << StartValue.toString(10) << EndValue.toString(10)
3190 << StartIndex->getSourceRange() << EndIndex->getSourceRange();
3191 Invalid = true;
3192 } else {
3193 Designators.push_back(ASTDesignator(InitExpressions.size(),
3194 D.getLBracketLoc(),
3195 D.getEllipsisLoc(),
3196 D.getRBracketLoc()));
3197 InitExpressions.push_back(StartIndex);
3198 InitExpressions.push_back(EndIndex);
3199 }
3200 }
3201 break;
3202 }
3203 }
3204 }
3205
3206 if (Invalid || Init.isInvalid())
3207 return ExprError();
3208
3209 // Clear out the expressions within the designation.
3210 Desig.ClearExprs(*this);
3211
3212 return DesignatedInitExpr::Create(Context, Designators, InitExpressions,
3213 EqualOrColonLoc, GNUSyntax,
3214 Init.getAs<Expr>());
3215}
3216
3217//===----------------------------------------------------------------------===//
3218// Initialization entity
3219//===----------------------------------------------------------------------===//
3220
3221InitializedEntity::InitializedEntity(ASTContext &Context, unsigned Index,
3222 const InitializedEntity &Parent)
3223 : Parent(&Parent), Index(Index)
3224{
3225 if (const ArrayType *AT = Context.getAsArrayType(Parent.getType())) {
3226 Kind = EK_ArrayElement;
3227 Type = AT->getElementType();
3228 } else if (const VectorType *VT = Parent.getType()->getAs<VectorType>()) {
3229 Kind = EK_VectorElement;
3230 Type = VT->getElementType();
3231 } else {
3232 const ComplexType *CT = Parent.getType()->getAs<ComplexType>();
3233 assert(CT && "Unexpected type")((CT && "Unexpected type") ? static_cast<void> (
0) : __assert_fail ("CT && \"Unexpected type\"", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 3233, __PRETTY_FUNCTION__))
;
3234 Kind = EK_ComplexElement;
3235 Type = CT->getElementType();
3236 }
3237}
3238
3239InitializedEntity
3240InitializedEntity::InitializeBase(ASTContext &Context,
3241 const CXXBaseSpecifier *Base,
3242 bool IsInheritedVirtualBase,
3243 const InitializedEntity *Parent) {
3244 InitializedEntity Result;
3245 Result.Kind = EK_Base;
3246 Result.Parent = Parent;
3247 Result.Base = reinterpret_cast<uintptr_t>(Base);
3248 if (IsInheritedVirtualBase)
3249 Result.Base |= 0x01;
3250
3251 Result.Type = Base->getType();
3252 return Result;
3253}
3254
3255DeclarationName InitializedEntity::getName() const {
3256 switch (getKind()) {
3257 case EK_Parameter:
3258 case EK_Parameter_CF_Audited: {
3259 ParmVarDecl *D = reinterpret_cast<ParmVarDecl*>(Parameter & ~0x1);
3260 return (D ? D->getDeclName() : DeclarationName());
3261 }
3262
3263 case EK_Variable:
3264 case EK_Member:
3265 case EK_Binding:
3266 return Variable.VariableOrMember->getDeclName();
3267
3268 case EK_LambdaCapture:
3269 return DeclarationName(Capture.VarID);
3270
3271 case EK_Result:
3272 case EK_StmtExprResult:
3273 case EK_Exception:
3274 case EK_New:
3275 case EK_Temporary:
3276 case EK_Base:
3277 case EK_Delegating:
3278 case EK_ArrayElement:
3279 case EK_VectorElement:
3280 case EK_ComplexElement:
3281 case EK_BlockElement:
3282 case EK_LambdaToBlockConversionBlockElement:
3283 case EK_CompoundLiteralInit:
3284 case EK_RelatedResult:
3285 return DeclarationName();
3286 }
3287
3288 llvm_unreachable("Invalid EntityKind!")::llvm::llvm_unreachable_internal("Invalid EntityKind!", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 3288)
;
3289}
3290
3291ValueDecl *InitializedEntity::getDecl() const {
3292 switch (getKind()) {
3293 case EK_Variable:
3294 case EK_Member:
3295 case EK_Binding:
3296 return Variable.VariableOrMember;
3297
3298 case EK_Parameter:
3299 case EK_Parameter_CF_Audited:
3300 return reinterpret_cast<ParmVarDecl*>(Parameter & ~0x1);
3301
3302 case EK_Result:
3303 case EK_StmtExprResult:
3304 case EK_Exception:
3305 case EK_New:
3306 case EK_Temporary:
3307 case EK_Base:
3308 case EK_Delegating:
3309 case EK_ArrayElement:
3310 case EK_VectorElement:
3311 case EK_ComplexElement:
3312 case EK_BlockElement:
3313 case EK_LambdaToBlockConversionBlockElement:
3314 case EK_LambdaCapture:
3315 case EK_CompoundLiteralInit:
3316 case EK_RelatedResult:
3317 return nullptr;
3318 }
3319
3320 llvm_unreachable("Invalid EntityKind!")::llvm::llvm_unreachable_internal("Invalid EntityKind!", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 3320)
;
3321}
3322
3323bool InitializedEntity::allowsNRVO() const {
3324 switch (getKind()) {
3325 case EK_Result:
3326 case EK_Exception:
3327 return LocAndNRVO.NRVO;
3328
3329 case EK_StmtExprResult:
3330 case EK_Variable:
3331 case EK_Parameter:
3332 case EK_Parameter_CF_Audited:
3333 case EK_Member:
3334 case EK_Binding:
3335 case EK_New:
3336 case EK_Temporary:
3337 case EK_CompoundLiteralInit:
3338 case EK_Base:
3339 case EK_Delegating:
3340 case EK_ArrayElement:
3341 case EK_VectorElement:
3342 case EK_ComplexElement:
3343 case EK_BlockElement:
3344 case EK_LambdaToBlockConversionBlockElement:
3345 case EK_LambdaCapture:
3346 case EK_RelatedResult:
3347 break;
3348 }
3349
3350 return false;
3351}
3352
3353unsigned InitializedEntity::dumpImpl(raw_ostream &OS) const {
3354 assert(getParent() != this)((getParent() != this) ? static_cast<void> (0) : __assert_fail
("getParent() != this", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 3354, __PRETTY_FUNCTION__))
;
3355 unsigned Depth = getParent() ? getParent()->dumpImpl(OS) : 0;
3356 for (unsigned I = 0; I != Depth; ++I)
3357 OS << "`-";
3358
3359 switch (getKind()) {
3360 case EK_Variable: OS << "Variable"; break;
3361 case EK_Parameter: OS << "Parameter"; break;
3362 case EK_Parameter_CF_Audited: OS << "CF audited function Parameter";
3363 break;
3364 case EK_Result: OS << "Result"; break;
3365 case EK_StmtExprResult: OS << "StmtExprResult"; break;
3366 case EK_Exception: OS << "Exception"; break;
3367 case EK_Member: OS << "Member"; break;
3368 case EK_Binding: OS << "Binding"; break;
3369 case EK_New: OS << "New"; break;
3370 case EK_Temporary: OS << "Temporary"; break;
3371 case EK_CompoundLiteralInit: OS << "CompoundLiteral";break;
3372 case EK_RelatedResult: OS << "RelatedResult"; break;
3373 case EK_Base: OS << "Base"; break;
3374 case EK_Delegating: OS << "Delegating"; break;
3375 case EK_ArrayElement: OS << "ArrayElement " << Index; break;
3376 case EK_VectorElement: OS << "VectorElement " << Index; break;
3377 case EK_ComplexElement: OS << "ComplexElement " << Index; break;
3378 case EK_BlockElement: OS << "Block"; break;
3379 case EK_LambdaToBlockConversionBlockElement:
3380 OS << "Block (lambda)";
3381 break;
3382 case EK_LambdaCapture:
3383 OS << "LambdaCapture ";
3384 OS << DeclarationName(Capture.VarID);
3385 break;
3386 }
3387
3388 if (auto *D = getDecl()) {
3389 OS << " ";
3390 D->printQualifiedName(OS);
3391 }
3392
3393 OS << " '" << getType().getAsString() << "'\n";
3394
3395 return Depth + 1;
3396}
3397
3398LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void InitializedEntity::dump() const {
3399 dumpImpl(llvm::errs());
3400}
3401
3402//===----------------------------------------------------------------------===//
3403// Initialization sequence
3404//===----------------------------------------------------------------------===//
3405
3406void InitializationSequence::Step::Destroy() {
3407 switch (Kind) {
3408 case SK_ResolveAddressOfOverloadedFunction:
3409 case SK_CastDerivedToBaseRValue:
3410 case SK_CastDerivedToBaseXValue:
3411 case SK_CastDerivedToBaseLValue:
3412 case SK_BindReference:
3413 case SK_BindReferenceToTemporary:
3414 case SK_FinalCopy:
3415 case SK_ExtraneousCopyToTemporary:
3416 case SK_UserConversion:
3417 case SK_QualificationConversionRValue:
3418 case SK_QualificationConversionXValue:
3419 case SK_QualificationConversionLValue:
3420 case SK_AtomicConversion:
3421 case SK_ListInitialization:
3422 case SK_UnwrapInitList:
3423 case SK_RewrapInitList:
3424 case SK_ConstructorInitialization:
3425 case SK_ConstructorInitializationFromList:
3426 case SK_ZeroInitialization:
3427 case SK_CAssignment:
3428 case SK_StringInit:
3429 case SK_ObjCObjectConversion:
3430 case SK_ArrayLoopIndex:
3431 case SK_ArrayLoopInit:
3432 case SK_ArrayInit:
3433 case SK_GNUArrayInit:
3434 case SK_ParenthesizedArrayInit:
3435 case SK_PassByIndirectCopyRestore:
3436 case SK_PassByIndirectRestore:
3437 case SK_ProduceObjCObject:
3438 case SK_StdInitializerList:
3439 case SK_StdInitializerListConstructorCall:
3440 case SK_OCLSamplerInit:
3441 case SK_OCLZeroOpaqueType:
3442 break;
3443
3444 case SK_ConversionSequence:
3445 case SK_ConversionSequenceNoNarrowing:
3446 delete ICS;
3447 }
3448}
3449
3450bool InitializationSequence::isDirectReferenceBinding() const {
3451 // There can be some lvalue adjustments after the SK_BindReference step.
3452 for (auto I = Steps.rbegin(); I != Steps.rend(); ++I) {
3453 if (I->Kind == SK_BindReference)
3454 return true;
3455 if (I->Kind == SK_BindReferenceToTemporary)
3456 return false;
3457 }
3458 return false;
3459}
3460
3461bool InitializationSequence::isAmbiguous() const {
3462 if (!Failed())
3463 return false;
3464
3465 switch (getFailureKind()) {
3466 case FK_TooManyInitsForReference:
3467 case FK_ParenthesizedListInitForReference:
3468 case FK_ArrayNeedsInitList:
3469 case FK_ArrayNeedsInitListOrStringLiteral:
3470 case FK_ArrayNeedsInitListOrWideStringLiteral:
3471 case FK_NarrowStringIntoWideCharArray:
3472 case FK_WideStringIntoCharArray:
3473 case FK_IncompatWideStringIntoWideChar:
3474 case FK_PlainStringIntoUTF8Char:
3475 case FK_UTF8StringIntoPlainChar:
3476 case FK_AddressOfOverloadFailed: // FIXME: Could do better
3477 case FK_NonConstLValueReferenceBindingToTemporary:
3478 case FK_NonConstLValueReferenceBindingToBitfield:
3479 case FK_NonConstLValueReferenceBindingToVectorElement:
3480 case FK_NonConstLValueReferenceBindingToUnrelated:
3481 case FK_RValueReferenceBindingToLValue:
3482 case FK_ReferenceAddrspaceMismatchTemporary:
3483 case FK_ReferenceInitDropsQualifiers:
3484 case FK_ReferenceInitFailed:
3485 case FK_ConversionFailed:
3486 case FK_ConversionFromPropertyFailed:
3487 case FK_TooManyInitsForScalar:
3488 case FK_ParenthesizedListInitForScalar:
3489 case FK_ReferenceBindingToInitList:
3490 case FK_InitListBadDestinationType:
3491 case FK_DefaultInitOfConst:
3492 case FK_Incomplete:
3493 case FK_ArrayTypeMismatch:
3494 case FK_NonConstantArrayInit:
3495 case FK_ListInitializationFailed:
3496 case FK_VariableLengthArrayHasInitializer:
3497 case FK_PlaceholderType:
3498 case FK_ExplicitConstructor:
3499 case FK_AddressOfUnaddressableFunction:
3500 return false;
3501
3502 case FK_ReferenceInitOverloadFailed:
3503 case FK_UserConversionOverloadFailed:
3504 case FK_ConstructorOverloadFailed:
3505 case FK_ListConstructorOverloadFailed:
3506 return FailedOverloadResult == OR_Ambiguous;
3507 }
3508
3509 llvm_unreachable("Invalid EntityKind!")::llvm::llvm_unreachable_internal("Invalid EntityKind!", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 3509)
;
3510}
3511
3512bool InitializationSequence::isConstructorInitialization() const {
3513 return !Steps.empty() && Steps.back().Kind == SK_ConstructorInitialization;
3514}
3515
3516void
3517InitializationSequence
3518::AddAddressOverloadResolutionStep(FunctionDecl *Function,
3519 DeclAccessPair Found,
3520 bool HadMultipleCandidates) {
3521 Step S;
3522 S.Kind = SK_ResolveAddressOfOverloadedFunction;
3523 S.Type = Function->getType();
3524 S.Function.HadMultipleCandidates = HadMultipleCandidates;
3525 S.Function.Function = Function;
3526 S.Function.FoundDecl = Found;
3527 Steps.push_back(S);
3528}
3529
3530void InitializationSequence::AddDerivedToBaseCastStep(QualType BaseType,
3531 ExprValueKind VK) {
3532 Step S;
3533 switch (VK) {
3534 case VK_RValue: S.Kind = SK_CastDerivedToBaseRValue; break;
3535 case VK_XValue: S.Kind = SK_CastDerivedToBaseXValue; break;
3536 case VK_LValue: S.Kind = SK_CastDerivedToBaseLValue; break;
3537 }
3538 S.Type = BaseType;
3539 Steps.push_back(S);
3540}
3541
3542void InitializationSequence::AddReferenceBindingStep(QualType T,
3543 bool BindingTemporary) {
3544 Step S;
3545 S.Kind = BindingTemporary? SK_BindReferenceToTemporary : SK_BindReference;
3546 S.Type = T;
3547 Steps.push_back(S);
3548}
3549
3550void InitializationSequence::AddFinalCopy(QualType T) {
3551 Step S;
3552 S.Kind = SK_FinalCopy;
3553 S.Type = T;
3554 Steps.push_back(S);
3555}
3556
3557void InitializationSequence::AddExtraneousCopyToTemporary(QualType T) {
3558 Step S;
3559 S.Kind = SK_ExtraneousCopyToTemporary;
3560 S.Type = T;
3561 Steps.push_back(S);
3562}
3563
3564void
3565InitializationSequence::AddUserConversionStep(FunctionDecl *Function,
3566 DeclAccessPair FoundDecl,
3567 QualType T,
3568 bool HadMultipleCandidates) {
3569 Step S;
3570 S.Kind = SK_UserConversion;
3571 S.Type = T;
3572 S.Function.HadMultipleCandidates = HadMultipleCandidates;
3573 S.Function.Function = Function;
3574 S.Function.FoundDecl = FoundDecl;
3575 Steps.push_back(S);
3576}
3577
3578void InitializationSequence::AddQualificationConversionStep(QualType Ty,
3579 ExprValueKind VK) {
3580 Step S;
3581 S.Kind = SK_QualificationConversionRValue; // work around a gcc warning
3582 switch (VK) {
3583 case VK_RValue:
3584 S.Kind = SK_QualificationConversionRValue;
3585 break;
3586 case VK_XValue:
3587 S.Kind = SK_QualificationConversionXValue;
3588 break;
3589 case VK_LValue:
3590 S.Kind = SK_QualificationConversionLValue;
3591 break;
3592 }
3593 S.Type = Ty;
3594 Steps.push_back(S);
3595}
3596
3597void InitializationSequence::AddAtomicConversionStep(QualType Ty) {
3598 Step S;
3599 S.Kind = SK_AtomicConversion;
3600 S.Type = Ty;
3601 Steps.push_back(S);
3602}
3603
3604void InitializationSequence::AddConversionSequenceStep(
3605 const ImplicitConversionSequence &ICS, QualType T,
3606 bool TopLevelOfInitList) {
3607 Step S;
3608 S.Kind = TopLevelOfInitList ? SK_ConversionSequenceNoNarrowing
3609 : SK_ConversionSequence;
3610 S.Type = T;
3611 S.ICS = new ImplicitConversionSequence(ICS);
3612 Steps.push_back(S);
3613}
3614
3615void InitializationSequence::AddListInitializationStep(QualType T) {
3616 Step S;
3617 S.Kind = SK_ListInitialization;
3618 S.Type = T;
3619 Steps.push_back(S);
3620}
3621
3622void InitializationSequence::AddConstructorInitializationStep(
3623 DeclAccessPair FoundDecl, CXXConstructorDecl *Constructor, QualType T,
3624 bool HadMultipleCandidates, bool FromInitList, bool AsInitList) {
3625 Step S;
3626 S.Kind = FromInitList ? AsInitList ? SK_StdInitializerListConstructorCall
3627 : SK_ConstructorInitializationFromList
3628 : SK_ConstructorInitialization;
3629 S.Type = T;
3630 S.Function.HadMultipleCandidates = HadMultipleCandidates;
3631 S.Function.Function = Constructor;
3632 S.Function.FoundDecl = FoundDecl;
3633 Steps.push_back(S);
3634}
3635
3636void InitializationSequence::AddZeroInitializationStep(QualType T) {
3637 Step S;
3638 S.Kind = SK_ZeroInitialization;
3639 S.Type = T;
3640 Steps.push_back(S);
3641}
3642
3643void InitializationSequence::AddCAssignmentStep(QualType T) {
3644 Step S;
3645 S.Kind = SK_CAssignment;
3646 S.Type = T;
3647 Steps.push_back(S);
3648}
3649
3650void InitializationSequence::AddStringInitStep(QualType T) {
3651 Step S;
3652 S.Kind = SK_StringInit;
3653 S.Type = T;
3654 Steps.push_back(S);
3655}
3656
3657void InitializationSequence::AddObjCObjectConversionStep(QualType T) {
3658 Step S;
3659 S.Kind = SK_ObjCObjectConversion;
3660 S.Type = T;
3661 Steps.push_back(S);
3662}
3663
3664void InitializationSequence::AddArrayInitStep(QualType T, bool IsGNUExtension) {
3665 Step S;
3666 S.Kind = IsGNUExtension ? SK_GNUArrayInit : SK_ArrayInit;
3667 S.Type = T;
3668 Steps.push_back(S);
3669}
3670
3671void InitializationSequence::AddArrayInitLoopStep(QualType T, QualType EltT) {
3672 Step S;
3673 S.Kind = SK_ArrayLoopIndex;
3674 S.Type = EltT;
3675 Steps.insert(Steps.begin(), S);
3676
3677 S.Kind = SK_ArrayLoopInit;
3678 S.Type = T;
3679 Steps.push_back(S);
3680}
3681
3682void InitializationSequence::AddParenthesizedArrayInitStep(QualType T) {
3683 Step S;
3684 S.Kind = SK_ParenthesizedArrayInit;
3685 S.Type = T;
3686 Steps.push_back(S);
3687}
3688
3689void InitializationSequence::AddPassByIndirectCopyRestoreStep(QualType type,
3690 bool shouldCopy) {
3691 Step s;
3692 s.Kind = (shouldCopy ? SK_PassByIndirectCopyRestore
3693 : SK_PassByIndirectRestore);
3694 s.Type = type;
3695 Steps.push_back(s);
3696}
3697
3698void InitializationSequence::AddProduceObjCObjectStep(QualType T) {
3699 Step S;
3700 S.Kind = SK_ProduceObjCObject;
3701 S.Type = T;
3702 Steps.push_back(S);
3703}
3704
3705void InitializationSequence::AddStdInitializerListConstructionStep(QualType T) {
3706 Step S;
3707 S.Kind = SK_StdInitializerList;
3708 S.Type = T;
3709 Steps.push_back(S);
3710}
3711
3712void InitializationSequence::AddOCLSamplerInitStep(QualType T) {
3713 Step S;
3714 S.Kind = SK_OCLSamplerInit;
3715 S.Type = T;
3716 Steps.push_back(S);
3717}
3718
3719void InitializationSequence::AddOCLZeroOpaqueTypeStep(QualType T) {
3720 Step S;
3721 S.Kind = SK_OCLZeroOpaqueType;
3722 S.Type = T;
3723 Steps.push_back(S);
3724}
3725
3726void InitializationSequence::RewrapReferenceInitList(QualType T,
3727 InitListExpr *Syntactic) {
3728 assert(Syntactic->getNumInits() == 1 &&((Syntactic->getNumInits() == 1 && "Can only rewrap trivial init lists."
) ? static_cast<void> (0) : __assert_fail ("Syntactic->getNumInits() == 1 && \"Can only rewrap trivial init lists.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 3729, __PRETTY_FUNCTION__))
3729 "Can only rewrap trivial init lists.")((Syntactic->getNumInits() == 1 && "Can only rewrap trivial init lists."
) ? static_cast<void> (0) : __assert_fail ("Syntactic->getNumInits() == 1 && \"Can only rewrap trivial init lists.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 3729, __PRETTY_FUNCTION__))
;
3730 Step S;
3731 S.Kind = SK_UnwrapInitList;
3732 S.Type = Syntactic->getInit(0)->getType();
3733 Steps.insert(Steps.begin(), S);
3734
3735 S.Kind = SK_RewrapInitList;
3736 S.Type = T;
3737 S.WrappingSyntacticList = Syntactic;
3738 Steps.push_back(S);
3739}
3740
3741void InitializationSequence::SetOverloadFailure(FailureKind Failure,
3742 OverloadingResult Result) {
3743 setSequenceKind(FailedSequence);
3744 this->Failure = Failure;
3745 this->FailedOverloadResult = Result;
3746}
3747
3748//===----------------------------------------------------------------------===//
3749// Attempt initialization
3750//===----------------------------------------------------------------------===//
3751
3752/// Tries to add a zero initializer. Returns true if that worked.
3753static bool
3754maybeRecoverWithZeroInitialization(Sema &S, InitializationSequence &Sequence,
3755 const InitializedEntity &Entity) {
3756 if (Entity.getKind() != InitializedEntity::EK_Variable)
3757 return false;
3758
3759 VarDecl *VD = cast<VarDecl>(Entity.getDecl());
3760 if (VD->getInit() || VD->getEndLoc().isMacroID())
3761 return false;
3762
3763 QualType VariableTy = VD->getType().getCanonicalType();
3764 SourceLocation Loc = S.getLocForEndOfToken(VD->getEndLoc());
3765 std::string Init = S.getFixItZeroInitializerForType(VariableTy, Loc);
3766 if (!Init.empty()) {
3767 Sequence.AddZeroInitializationStep(Entity.getType());
3768 Sequence.SetZeroInitializationFixit(Init, Loc);
3769 return true;
3770 }
3771 return false;
3772}
3773
3774static void MaybeProduceObjCObject(Sema &S,
3775 InitializationSequence &Sequence,
3776 const InitializedEntity &Entity) {
3777 if (!S.getLangOpts().ObjCAutoRefCount) return;
3778
3779 /// When initializing a parameter, produce the value if it's marked
3780 /// __attribute__((ns_consumed)).
3781 if (Entity.isParameterKind()) {
3782 if (!Entity.isParameterConsumed())
3783 return;
3784
3785 assert(Entity.getType()->isObjCRetainableType() &&((Entity.getType()->isObjCRetainableType() && "consuming an object of unretainable type?"
) ? static_cast<void> (0) : __assert_fail ("Entity.getType()->isObjCRetainableType() && \"consuming an object of unretainable type?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 3786, __PRETTY_FUNCTION__))
3786 "consuming an object of unretainable type?")((Entity.getType()->isObjCRetainableType() && "consuming an object of unretainable type?"
) ? static_cast<void> (0) : __assert_fail ("Entity.getType()->isObjCRetainableType() && \"consuming an object of unretainable type?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 3786, __PRETTY_FUNCTION__))
;
3787 Sequence.AddProduceObjCObjectStep(Entity.getType());
3788
3789 /// When initializing a return value, if the return type is a
3790 /// retainable type, then returns need to immediately retain the
3791 /// object. If an autorelease is required, it will be done at the
3792 /// last instant.
3793 } else if (Entity.getKind() == InitializedEntity::EK_Result ||
3794 Entity.getKind() == InitializedEntity::EK_StmtExprResult) {
3795 if (!Entity.getType()->isObjCRetainableType())
3796 return;
3797
3798 Sequence.AddProduceObjCObjectStep(Entity.getType());
3799 }
3800}
3801
3802static void TryListInitialization(Sema &S,
3803 const InitializedEntity &Entity,
3804 const InitializationKind &Kind,
3805 InitListExpr *InitList,
3806 InitializationSequence &Sequence,
3807 bool TreatUnavailableAsInvalid);
3808
3809/// When initializing from init list via constructor, handle
3810/// initialization of an object of type std::initializer_list<T>.
3811///
3812/// \return true if we have handled initialization of an object of type
3813/// std::initializer_list<T>, false otherwise.
3814static bool TryInitializerListConstruction(Sema &S,
3815 InitListExpr *List,
3816 QualType DestType,
3817 InitializationSequence &Sequence,
3818 bool TreatUnavailableAsInvalid) {
3819 QualType E;
3820 if (!S.isStdInitializerList(DestType, &E))
3821 return false;
3822
3823 if (!S.isCompleteType(List->getExprLoc(), E)) {
3824 Sequence.setIncompleteTypeFailure(E);
3825 return true;
3826 }
3827
3828 // Try initializing a temporary array from the init list.
3829 QualType ArrayType = S.Context.getConstantArrayType(
3830 E.withConst(),
3831 llvm::APInt(S.Context.getTypeSize(S.Context.getSizeType()),
3832 List->getNumInits()),
3833 nullptr, clang::ArrayType::Normal, 0);
3834 InitializedEntity HiddenArray =
3835 InitializedEntity::InitializeTemporary(ArrayType);
3836 InitializationKind Kind = InitializationKind::CreateDirectList(
3837 List->getExprLoc(), List->getBeginLoc(), List->getEndLoc());
3838 TryListInitialization(S, HiddenArray, Kind, List, Sequence,
3839 TreatUnavailableAsInvalid);
3840 if (Sequence)
3841 Sequence.AddStdInitializerListConstructionStep(DestType);
3842 return true;
3843}
3844
3845/// Determine if the constructor has the signature of a copy or move
3846/// constructor for the type T of the class in which it was found. That is,
3847/// determine if its first parameter is of type T or reference to (possibly
3848/// cv-qualified) T.
3849static bool hasCopyOrMoveCtorParam(ASTContext &Ctx,
3850 const ConstructorInfo &Info) {
3851 if (Info.Constructor->getNumParams() == 0)
3852 return false;
3853
3854 QualType ParmT =
3855 Info.Constructor->getParamDecl(0)->getType().getNonReferenceType();
3856 QualType ClassT =
3857 Ctx.getRecordType(cast<CXXRecordDecl>(Info.FoundDecl->getDeclContext()));
3858
3859 return Ctx.hasSameUnqualifiedType(ParmT, ClassT);
3860}
3861
3862static OverloadingResult
3863ResolveConstructorOverload(Sema &S, SourceLocation DeclLoc,
3864 MultiExprArg Args,
3865 OverloadCandidateSet &CandidateSet,
3866 QualType DestType,
3867 DeclContext::lookup_result Ctors,
3868 OverloadCandidateSet::iterator &Best,
3869 bool CopyInitializing, bool AllowExplicit,
3870 bool OnlyListConstructors, bool IsListInit,
3871 bool SecondStepOfCopyInit = false) {
3872 CandidateSet.clear(OverloadCandidateSet::CSK_InitByConstructor);
3873 CandidateSet.setDestAS(DestType.getQualifiers().getAddressSpace());
3874
3875 for (NamedDecl *D : Ctors) {
3876 auto Info = getConstructorInfo(D);
3877 if (!Info.Constructor || Info.Constructor->isInvalidDecl())
3878 continue;
3879
3880 if (OnlyListConstructors && !S.isInitListConstructor(Info.Constructor))
3881 continue;
3882
3883 // C++11 [over.best.ics]p4:
3884 // ... and the constructor or user-defined conversion function is a
3885 // candidate by
3886 // - 13.3.1.3, when the argument is the temporary in the second step
3887 // of a class copy-initialization, or
3888 // - 13.3.1.4, 13.3.1.5, or 13.3.1.6 (in all cases), [not handled here]
3889 // - the second phase of 13.3.1.7 when the initializer list has exactly
3890 // one element that is itself an initializer list, and the target is
3891 // the first parameter of a constructor of class X, and the conversion
3892 // is to X or reference to (possibly cv-qualified X),
3893 // user-defined conversion sequences are not considered.
3894 bool SuppressUserConversions =
3895 SecondStepOfCopyInit ||
3896 (IsListInit && Args.size() == 1 && isa<InitListExpr>(Args[0]) &&
3897 hasCopyOrMoveCtorParam(S.Context, Info));
3898
3899 if (Info.ConstructorTmpl)
3900 S.AddTemplateOverloadCandidate(
3901 Info.ConstructorTmpl, Info.FoundDecl,
3902 /*ExplicitArgs*/ nullptr, Args, CandidateSet, SuppressUserConversions,
3903 /*PartialOverloading=*/false, AllowExplicit);
3904 else {
3905 // C++ [over.match.copy]p1:
3906 // - When initializing a temporary to be bound to the first parameter
3907 // of a constructor [for type T] that takes a reference to possibly
3908 // cv-qualified T as its first argument, called with a single
3909 // argument in the context of direct-initialization, explicit
3910 // conversion functions are also considered.
3911 // FIXME: What if a constructor template instantiates to such a signature?
3912 bool AllowExplicitConv = AllowExplicit && !CopyInitializing &&
3913 Args.size() == 1 &&
3914 hasCopyOrMoveCtorParam(S.Context, Info);
3915 S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl, Args,
3916 CandidateSet, SuppressUserConversions,
3917 /*PartialOverloading=*/false, AllowExplicit,
3918 AllowExplicitConv);
3919 }
3920 }
3921
3922 // FIXME: Work around a bug in C++17 guaranteed copy elision.
3923 //
3924 // When initializing an object of class type T by constructor
3925 // ([over.match.ctor]) or by list-initialization ([over.match.list])
3926 // from a single expression of class type U, conversion functions of
3927 // U that convert to the non-reference type cv T are candidates.
3928 // Explicit conversion functions are only candidates during
3929 // direct-initialization.
3930 //
3931 // Note: SecondStepOfCopyInit is only ever true in this case when
3932 // evaluating whether to produce a C++98 compatibility warning.
3933 if (S.getLangOpts().CPlusPlus17 && Args.size() == 1 &&
3934 !SecondStepOfCopyInit) {
3935 Expr *Initializer = Args[0];
3936 auto *SourceRD = Initializer->getType()->getAsCXXRecordDecl();
3937 if (SourceRD && S.isCompleteType(DeclLoc, Initializer->getType())) {
3938 const auto &Conversions = SourceRD->getVisibleConversionFunctions();
3939 for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) {
3940 NamedDecl *D = *I;
3941 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
3942 D = D->getUnderlyingDecl();
3943
3944 FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
3945 CXXConversionDecl *Conv;
3946 if (ConvTemplate)
3947 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
3948 else
3949 Conv = cast<CXXConversionDecl>(D);
3950
3951 if (ConvTemplate)
3952 S.AddTemplateConversionCandidate(
3953 ConvTemplate, I.getPair(), ActingDC, Initializer, DestType,
3954 CandidateSet, AllowExplicit, AllowExplicit,
3955 /*AllowResultConversion*/ false);
3956 else
3957 S.AddConversionCandidate(Conv, I.getPair(), ActingDC, Initializer,
3958 DestType, CandidateSet, AllowExplicit,
3959 AllowExplicit,
3960 /*AllowResultConversion*/ false);
3961 }
3962 }
3963 }
3964
3965 // Perform overload resolution and return the result.
3966 return CandidateSet.BestViableFunction(S, DeclLoc, Best);
3967}
3968
3969/// Attempt initialization by constructor (C++ [dcl.init]), which
3970/// enumerates the constructors of the initialized entity and performs overload
3971/// resolution to select the best.
3972/// \param DestType The destination class type.
3973/// \param DestArrayType The destination type, which is either DestType or
3974/// a (possibly multidimensional) array of DestType.
3975/// \param IsListInit Is this list-initialization?
3976/// \param IsInitListCopy Is this non-list-initialization resulting from a
3977/// list-initialization from {x} where x is the same
3978/// type as the entity?
3979static void TryConstructorInitialization(Sema &S,
3980 const InitializedEntity &Entity,
3981 const InitializationKind &Kind,
3982 MultiExprArg Args, QualType DestType,
3983 QualType DestArrayType,
3984 InitializationSequence &Sequence,
3985 bool IsListInit = false,
3986 bool IsInitListCopy = false) {
3987 assert(((!IsListInit && !IsInitListCopy) ||((((!IsListInit && !IsInitListCopy) || (Args.size() ==
1 && isa<InitListExpr>(Args[0]))) && "IsListInit/IsInitListCopy must come with a single initializer list "
"argument.") ? static_cast<void> (0) : __assert_fail (
"((!IsListInit && !IsInitListCopy) || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) && \"IsListInit/IsInitListCopy must come with a single initializer list \" \"argument.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 3990, __PRETTY_FUNCTION__))
3988 (Args.size() == 1 && isa<InitListExpr>(Args[0]))) &&((((!IsListInit && !IsInitListCopy) || (Args.size() ==
1 && isa<InitListExpr>(Args[0]))) && "IsListInit/IsInitListCopy must come with a single initializer list "
"argument.") ? static_cast<void> (0) : __assert_fail (
"((!IsListInit && !IsInitListCopy) || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) && \"IsListInit/IsInitListCopy must come with a single initializer list \" \"argument.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 3990, __PRETTY_FUNCTION__))
3989 "IsListInit/IsInitListCopy must come with a single initializer list "((((!IsListInit && !IsInitListCopy) || (Args.size() ==
1 && isa<InitListExpr>(Args[0]))) && "IsListInit/IsInitListCopy must come with a single initializer list "
"argument.") ? static_cast<void> (0) : __assert_fail (
"((!IsListInit && !IsInitListCopy) || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) && \"IsListInit/IsInitListCopy must come with a single initializer list \" \"argument.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 3990, __PRETTY_FUNCTION__))
3990 "argument.")((((!IsListInit && !IsInitListCopy) || (Args.size() ==
1 && isa<InitListExpr>(Args[0]))) && "IsListInit/IsInitListCopy must come with a single initializer list "
"argument.") ? static_cast<void> (0) : __assert_fail (
"((!IsListInit && !IsInitListCopy) || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) && \"IsListInit/IsInitListCopy must come with a single initializer list \" \"argument.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 3990, __PRETTY_FUNCTION__))
;
3991 InitListExpr *ILE =
3992 (IsListInit || IsInitListCopy) ? cast<InitListExpr>(Args[0]) : nullptr;
3993 MultiExprArg UnwrappedArgs =
3994 ILE ? MultiExprArg(ILE->getInits(), ILE->getNumInits()) : Args;
3995
3996 // The type we're constructing needs to be complete.
3997 if (!S.isCompleteType(Kind.getLocation(), DestType)) {
3998 Sequence.setIncompleteTypeFailure(DestType);
3999 return;
4000 }
4001
4002 // C++17 [dcl.init]p17:
4003 // - If the initializer expression is a prvalue and the cv-unqualified
4004 // version of the source type is the same class as the class of the
4005 // destination, the initializer expression is used to initialize the
4006 // destination object.
4007 // Per DR (no number yet), this does not apply when initializing a base
4008 // class or delegating to another constructor from a mem-initializer.
4009 // ObjC++: Lambda captured by the block in the lambda to block conversion
4010 // should avoid copy elision.
4011 if (S.getLangOpts().CPlusPlus17 &&
4012 Entity.getKind() != InitializedEntity::EK_Base &&
4013 Entity.getKind() != InitializedEntity::EK_Delegating &&
4014 Entity.getKind() !=
4015 InitializedEntity::EK_LambdaToBlockConversionBlockElement &&
4016 UnwrappedArgs.size() == 1 && UnwrappedArgs[0]->isRValue() &&
4017 S.Context.hasSameUnqualifiedType(UnwrappedArgs[0]->getType(), DestType)) {
4018 // Convert qualifications if necessary.
4019 Sequence.AddQualificationConversionStep(DestType, VK_RValue);
4020 if (ILE)
4021 Sequence.RewrapReferenceInitList(DestType, ILE);
4022 return;
4023 }
4024
4025 const RecordType *DestRecordType = DestType->getAs<RecordType>();
4026 assert(DestRecordType && "Constructor initialization requires record type")((DestRecordType && "Constructor initialization requires record type"
) ? static_cast<void> (0) : __assert_fail ("DestRecordType && \"Constructor initialization requires record type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 4026, __PRETTY_FUNCTION__))
;
4027 CXXRecordDecl *DestRecordDecl
4028 = cast<CXXRecordDecl>(DestRecordType->getDecl());
4029
4030 // Build the candidate set directly in the initialization sequence
4031 // structure, so that it will persist if we fail.
4032 OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
4033
4034 // Determine whether we are allowed to call explicit constructors or
4035 // explicit conversion operators.
4036 bool AllowExplicit = Kind.AllowExplicit() || IsListInit;
4037 bool CopyInitialization = Kind.getKind() == InitializationKind::IK_Copy;
4038
4039 // - Otherwise, if T is a class type, constructors are considered. The
4040 // applicable constructors are enumerated, and the best one is chosen
4041 // through overload resolution.
4042 DeclContext::lookup_result Ctors = S.LookupConstructors(DestRecordDecl);
4043
4044 OverloadingResult Result = OR_No_Viable_Function;
4045 OverloadCandidateSet::iterator Best;
4046 bool AsInitializerList = false;
4047
4048 // C++11 [over.match.list]p1, per DR1467:
4049 // When objects of non-aggregate type T are list-initialized, such that
4050 // 8.5.4 [dcl.init.list] specifies that overload resolution is performed
4051 // according to the rules in this section, overload resolution selects
4052 // the constructor in two phases:
4053 //
4054 // - Initially, the candidate functions are the initializer-list
4055 // constructors of the class T and the argument list consists of the
4056 // initializer list as a single argument.
4057 if (IsListInit) {
4058 AsInitializerList = true;
4059
4060 // If the initializer list has no elements and T has a default constructor,
4061 // the first phase is omitted.
4062 if (!(UnwrappedArgs.empty() && DestRecordDecl->hasDefaultConstructor()))
4063 Result = ResolveConstructorOverload(S, Kind.getLocation(), Args,
4064 CandidateSet, DestType, Ctors, Best,
4065 CopyInitialization, AllowExplicit,
4066 /*OnlyListConstructors=*/true,
4067 IsListInit);
4068 }
4069
4070 // C++11 [over.match.list]p1:
4071 // - If no viable initializer-list constructor is found, overload resolution
4072 // is performed again, where the candidate functions are all the
4073 // constructors of the class T and the argument list consists of the
4074 // elements of the initializer list.
4075 if (Result == OR_No_Viable_Function) {
4076 AsInitializerList = false;
4077 Result = ResolveConstructorOverload(S, Kind.getLocation(), UnwrappedArgs,
4078 CandidateSet, DestType, Ctors, Best,
4079 CopyInitialization, AllowExplicit,
4080 /*OnlyListConstructors=*/false,
4081 IsListInit);
4082 }
4083 if (Result) {
4084 Sequence.SetOverloadFailure(IsListInit ?
4085 InitializationSequence::FK_ListConstructorOverloadFailed :
4086 InitializationSequence::FK_ConstructorOverloadFailed,
4087 Result);
4088 return;
4089 }
4090
4091 bool HadMultipleCandidates = (CandidateSet.size() > 1);
4092
4093 // In C++17, ResolveConstructorOverload can select a conversion function
4094 // instead of a constructor.
4095 if (auto *CD = dyn_cast<CXXConversionDecl>(Best->Function)) {
4096 // Add the user-defined conversion step that calls the conversion function.
4097 QualType ConvType = CD->getConversionType();
4098 assert(S.Context.hasSameUnqualifiedType(ConvType, DestType) &&((S.Context.hasSameUnqualifiedType(ConvType, DestType) &&
"should not have selected this conversion function") ? static_cast
<void> (0) : __assert_fail ("S.Context.hasSameUnqualifiedType(ConvType, DestType) && \"should not have selected this conversion function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 4099, __PRETTY_FUNCTION__))
4099 "should not have selected this conversion function")((S.Context.hasSameUnqualifiedType(ConvType, DestType) &&
"should not have selected this conversion function") ? static_cast
<void> (0) : __assert_fail ("S.Context.hasSameUnqualifiedType(ConvType, DestType) && \"should not have selected this conversion function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 4099, __PRETTY_FUNCTION__))
;
4100 Sequence.AddUserConversionStep(CD, Best->FoundDecl, ConvType,
4101 HadMultipleCandidates);
4102 if (!S.Context.hasSameType(ConvType, DestType))
4103 Sequence.AddQualificationConversionStep(DestType, VK_RValue);
4104 if (IsListInit)
4105 Sequence.RewrapReferenceInitList(Entity.getType(), ILE);
4106 return;
4107 }
4108
4109 // C++11 [dcl.init]p6:
4110 // If a program calls for the default initialization of an object
4111 // of a const-qualified type T, T shall be a class type with a
4112 // user-provided default constructor.
4113 // C++ core issue 253 proposal:
4114 // If the implicit default constructor initializes all subobjects, no
4115 // initializer should be required.
4116 // The 253 proposal is for example needed to process libstdc++ headers in 5.x.
4117 CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
4118 if (Kind.getKind() == InitializationKind::IK_Default &&
4119 Entity.getType().isConstQualified()) {
4120 if (!CtorDecl->getParent()->allowConstDefaultInit()) {
4121 if (!maybeRecoverWithZeroInitialization(S, Sequence, Entity))
4122 Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst);
4123 return;
4124 }
4125 }
4126
4127 // C++11 [over.match.list]p1:
4128 // In copy-list-initialization, if an explicit constructor is chosen, the
4129 // initializer is ill-formed.
4130 if (IsListInit && !Kind.AllowExplicit() && CtorDecl->isExplicit()) {
4131 Sequence.SetFailed(InitializationSequence::FK_ExplicitConstructor);
4132 return;
4133 }
4134
4135 // Add the constructor initialization step. Any cv-qualification conversion is
4136 // subsumed by the initialization.
4137 Sequence.AddConstructorInitializationStep(
4138 Best->FoundDecl, CtorDecl, DestArrayType, HadMultipleCandidates,
4139 IsListInit | IsInitListCopy, AsInitializerList);
4140}
4141
4142static bool
4143ResolveOverloadedFunctionForReferenceBinding(Sema &S,
4144 Expr *Initializer,
4145 QualType &SourceType,
4146 QualType &UnqualifiedSourceType,
4147 QualType UnqualifiedTargetType,
4148 InitializationSequence &Sequence) {
4149 if (S.Context.getCanonicalType(UnqualifiedSourceType) ==
4150 S.Context.OverloadTy) {
4151 DeclAccessPair Found;
4152 bool HadMultipleCandidates = false;
4153 if (FunctionDecl *Fn
4154 = S.ResolveAddressOfOverloadedFunction(Initializer,
4155 UnqualifiedTargetType,
4156 false, Found,
4157 &HadMultipleCandidates)) {
4158 Sequence.AddAddressOverloadResolutionStep(Fn, Found,
4159 HadMultipleCandidates);
4160 SourceType = Fn->getType();
4161 UnqualifiedSourceType = SourceType.getUnqualifiedType();
4162 } else if (!UnqualifiedTargetType->isRecordType()) {
4163 Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
4164 return true;
4165 }
4166 }
4167 return false;
4168}
4169
4170static void TryReferenceInitializationCore(Sema &S,
4171 const InitializedEntity &Entity,
4172 const InitializationKind &Kind,
4173 Expr *Initializer,
4174 QualType cv1T1, QualType T1,
4175 Qualifiers T1Quals,
4176 QualType cv2T2, QualType T2,
4177 Qualifiers T2Quals,
4178 InitializationSequence &Sequence);
4179
4180static void TryValueInitialization(Sema &S,
4181 const InitializedEntity &Entity,
4182 const InitializationKind &Kind,
4183 InitializationSequence &Sequence,
4184 InitListExpr *InitList = nullptr);
4185
4186/// Attempt list initialization of a reference.
4187static void TryReferenceListInitialization(Sema &S,
4188 const InitializedEntity &Entity,
4189 const InitializationKind &Kind,
4190 InitListExpr *InitList,
4191 InitializationSequence &Sequence,
4192 bool TreatUnavailableAsInvalid) {
4193 // First, catch C++03 where this isn't possible.
4194 if (!S.getLangOpts().CPlusPlus11) {
4195 Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList);
4196 return;
4197 }
4198 // Can't reference initialize a compound literal.
4199 if (Entity.getKind() == InitializedEntity::EK_CompoundLiteralInit) {
4200 Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList);
4201 return;
4202 }
4203
4204 QualType DestType = Entity.getType();
4205 QualType cv1T1 = DestType->castAs<ReferenceType>()->getPointeeType();
4206 Qualifiers T1Quals;
4207 QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals);
4208
4209 // Reference initialization via an initializer list works thus:
4210 // If the initializer list consists of a single element that is
4211 // reference-related to the referenced type, bind directly to that element
4212 // (possibly creating temporaries).
4213 // Otherwise, initialize a temporary with the initializer list and
4214 // bind to that.
4215 if (InitList->getNumInits() == 1) {
4216 Expr *Initializer = InitList->getInit(0);
4217 QualType cv2T2 = Initializer->getType();
4218 Qualifiers T2Quals;
4219 QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals);
4220
4221 // If this fails, creating a temporary wouldn't work either.
4222 if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2,
4223 T1, Sequence))
4224 return;
4225
4226 SourceLocation DeclLoc = Initializer->getBeginLoc();
4227 Sema::ReferenceCompareResult RefRelationship
4228 = S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2);
4229 if (RefRelationship >= Sema::Ref_Related) {
4230 // Try to bind the reference here.
4231 TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1,
4232 T1Quals, cv2T2, T2, T2Quals, Sequence);
4233 if (Sequence)
4234 Sequence.RewrapReferenceInitList(cv1T1, InitList);
4235 return;
4236 }
4237
4238 // Update the initializer if we've resolved an overloaded function.
4239 if (Sequence.step_begin() != Sequence.step_end())
4240 Sequence.RewrapReferenceInitList(cv1T1, InitList);
4241 }
4242
4243 // Not reference-related. Create a temporary and bind to that.
4244 InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(cv1T1);
4245
4246 TryListInitialization(S, TempEntity, Kind, InitList, Sequence,
4247 TreatUnavailableAsInvalid);
4248 if (Sequence) {
4249 if (DestType->isRValueReferenceType() ||
4250 (T1Quals.hasConst() && !T1Quals.hasVolatile()))
4251 Sequence.AddReferenceBindingStep(cv1T1, /*BindingTemporary=*/true);
4252 else
4253 Sequence.SetFailed(
4254 InitializationSequence::FK_NonConstLValueReferenceBindingToTemporary);
4255 }
4256}
4257
4258/// Attempt list initialization (C++0x [dcl.init.list])
4259static void TryListInitialization(Sema &S,
4260 const InitializedEntity &Entity,
4261 const InitializationKind &Kind,
4262 InitListExpr *InitList,
4263 InitializationSequence &Sequence,
4264 bool TreatUnavailableAsInvalid) {
4265 QualType DestType = Entity.getType();
4266
4267 // C++ doesn't allow scalar initialization with more than one argument.
4268 // But C99 complex numbers are scalars and it makes sense there.
4269 if (S.getLangOpts().CPlusPlus && DestType->isScalarType() &&
4270 !DestType->isAnyComplexType() && InitList->getNumInits() > 1) {
4271 Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForScalar);
4272 return;
4273 }
4274 if (DestType->isReferenceType()) {
4275 TryReferenceListInitialization(S, Entity, Kind, InitList, Sequence,
4276 TreatUnavailableAsInvalid);
4277 return;
4278 }
4279
4280 if (DestType->isRecordType() &&
4281 !S.isCompleteType(InitList->getBeginLoc(), DestType)) {
4282 Sequence.setIncompleteTypeFailure(DestType);
4283 return;
4284 }
4285
4286 // C++11 [dcl.init.list]p3, per DR1467:
4287 // - If T is a class type and the initializer list has a single element of
4288 // type cv U, where U is T or a class derived from T, the object is
4289 // initialized from that element (by copy-initialization for
4290 // copy-list-initialization, or by direct-initialization for
4291 // direct-list-initialization).
4292 // - Otherwise, if T is a character array and the initializer list has a
4293 // single element that is an appropriately-typed string literal
4294 // (8.5.2 [dcl.init.string]), initialization is performed as described
4295 // in that section.
4296 // - Otherwise, if T is an aggregate, [...] (continue below).
4297 if (S.getLangOpts().CPlusPlus11 && InitList->getNumInits() == 1) {
4298 if (DestType->isRecordType()) {
4299 QualType InitType = InitList->getInit(0)->getType();
4300 if (S.Context.hasSameUnqualifiedType(InitType, DestType) ||
4301 S.IsDerivedFrom(InitList->getBeginLoc(), InitType, DestType)) {
4302 Expr *InitListAsExpr = InitList;
4303 TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType,
4304 DestType, Sequence,
4305 /*InitListSyntax*/false,
4306 /*IsInitListCopy*/true);
4307 return;
4308 }
4309 }
4310 if (const ArrayType *DestAT = S.Context.getAsArrayType(DestType)) {
4311 Expr *SubInit[1] = {InitList->getInit(0)};
4312 if (!isa<VariableArrayType>(DestAT) &&
4313 IsStringInit(SubInit[0], DestAT, S.Context) == SIF_None) {
4314 InitializationKind SubKind =
4315 Kind.getKind() == InitializationKind::IK_DirectList
4316 ? InitializationKind::CreateDirect(Kind.getLocation(),
4317 InitList->getLBraceLoc(),
4318 InitList->getRBraceLoc())
4319 : Kind;
4320 Sequence.InitializeFrom(S, Entity, SubKind, SubInit,
4321 /*TopLevelOfInitList*/ true,
4322 TreatUnavailableAsInvalid);
4323
4324 // TryStringLiteralInitialization() (in InitializeFrom()) will fail if
4325 // the element is not an appropriately-typed string literal, in which
4326 // case we should proceed as in C++11 (below).
4327 if (Sequence) {
4328 Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
4329 return;
4330 }
4331 }
4332 }
4333 }
4334
4335 // C++11 [dcl.init.list]p3:
4336 // - If T is an aggregate, aggregate initialization is performed.
4337 if ((DestType->isRecordType() && !DestType->isAggregateType()) ||
4338 (S.getLangOpts().CPlusPlus11 &&
4339 S.isStdInitializerList(DestType, nullptr))) {
4340 if (S.getLangOpts().CPlusPlus11) {
4341 // - Otherwise, if the initializer list has no elements and T is a
4342 // class type with a default constructor, the object is
4343 // value-initialized.
4344 if (InitList->getNumInits() == 0) {
4345 CXXRecordDecl *RD = DestType->getAsCXXRecordDecl();
4346 if (RD->hasDefaultConstructor()) {
4347 TryValueInitialization(S, Entity, Kind, Sequence, InitList);
4348 return;
4349 }
4350 }
4351
4352 // - Otherwise, if T is a specialization of std::initializer_list<E>,
4353 // an initializer_list object constructed [...]
4354 if (TryInitializerListConstruction(S, InitList, DestType, Sequence,
4355 TreatUnavailableAsInvalid))
4356 return;
4357
4358 // - Otherwise, if T is a class type, constructors are considered.
4359 Expr *InitListAsExpr = InitList;
4360 TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType,
4361 DestType, Sequence, /*InitListSyntax*/true);
4362 } else
4363 Sequence.SetFailed(InitializationSequence::FK_InitListBadDestinationType);
4364 return;
4365 }
4366
4367 if (S.getLangOpts().CPlusPlus && !DestType->isAggregateType() &&
4368 InitList->getNumInits() == 1) {
4369 Expr *E = InitList->getInit(0);
4370
4371 // - Otherwise, if T is an enumeration with a fixed underlying type,
4372 // the initializer-list has a single element v, and the initialization
4373 // is direct-list-initialization, the object is initialized with the
4374 // value T(v); if a narrowing conversion is required to convert v to
4375 // the underlying type of T, the program is ill-formed.
4376 auto *ET = DestType->getAs<EnumType>();
4377 if (S.getLangOpts().CPlusPlus17 &&
4378 Kind.getKind() == InitializationKind::IK_DirectList &&
4379 ET && ET->getDecl()->isFixed() &&
4380 !S.Context.hasSameUnqualifiedType(E->getType(), DestType) &&
4381 (E->getType()->isIntegralOrEnumerationType() ||
4382 E->getType()->isFloatingType())) {
4383 // There are two ways that T(v) can work when T is an enumeration type.
4384 // If there is either an implicit conversion sequence from v to T or
4385 // a conversion function that can convert from v to T, then we use that.
4386 // Otherwise, if v is of integral, enumeration, or floating-point type,
4387 // it is converted to the enumeration type via its underlying type.
4388 // There is no overlap possible between these two cases (except when the
4389 // source value is already of the destination type), and the first
4390 // case is handled by the general case for single-element lists below.
4391 ImplicitConversionSequence ICS;
4392 ICS.setStandard();
4393 ICS.Standard.setAsIdentityConversion();
4394 if (!E->isRValue())
4395 ICS.Standard.First = ICK_Lvalue_To_Rvalue;
4396 // If E is of a floating-point type, then the conversion is ill-formed
4397 // due to narrowing, but go through the motions in order to produce the
4398 // right diagnostic.
4399 ICS.Standard.Second = E->getType()->isFloatingType()
4400 ? ICK_Floating_Integral
4401 : ICK_Integral_Conversion;
4402 ICS.Standard.setFromType(E->getType());
4403 ICS.Standard.setToType(0, E->getType());
4404 ICS.Standard.setToType(1, DestType);
4405 ICS.Standard.setToType(2, DestType);
4406 Sequence.AddConversionSequenceStep(ICS, ICS.Standard.getToType(2),
4407 /*TopLevelOfInitList*/true);
4408 Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
4409 return;
4410 }
4411
4412 // - Otherwise, if the initializer list has a single element of type E
4413 // [...references are handled above...], the object or reference is
4414 // initialized from that element (by copy-initialization for
4415 // copy-list-initialization, or by direct-initialization for
4416 // direct-list-initialization); if a narrowing conversion is required
4417 // to convert the element to T, the program is ill-formed.
4418 //
4419 // Per core-24034, this is direct-initialization if we were performing
4420 // direct-list-initialization and copy-initialization otherwise.
4421 // We can't use InitListChecker for this, because it always performs
4422 // copy-initialization. This only matters if we might use an 'explicit'
4423 // conversion operator, so we only need to handle the cases where the source
4424 // is of record type.
4425 if (InitList->getInit(0)->getType()->isRecordType()) {
4426 InitializationKind SubKind =
4427 Kind.getKind() == InitializationKind::IK_DirectList
4428 ? InitializationKind::CreateDirect(Kind.getLocation(),
4429 InitList->getLBraceLoc(),
4430 InitList->getRBraceLoc())
4431 : Kind;
4432 Expr *SubInit[1] = { InitList->getInit(0) };
4433 Sequence.InitializeFrom(S, Entity, SubKind, SubInit,
4434 /*TopLevelOfInitList*/true,
4435 TreatUnavailableAsInvalid);
4436 if (Sequence)
4437 Sequence.RewrapReferenceInitList(Entity.getType(), InitList);
4438 return;
4439 }
4440 }
4441
4442 InitListChecker CheckInitList(S, Entity, InitList,
4443 DestType, /*VerifyOnly=*/true, TreatUnavailableAsInvalid);
4444 if (CheckInitList.HadError()) {
4445 Sequence.SetFailed(InitializationSequence::FK_ListInitializationFailed);
4446 return;
4447 }
4448
4449 // Add the list initialization step with the built init list.
4450 Sequence.AddListInitializationStep(DestType);
4451}
4452
4453/// Try a reference initialization that involves calling a conversion
4454/// function.
4455static OverloadingResult TryRefInitWithConversionFunction(
4456 Sema &S, const InitializedEntity &Entity, const InitializationKind &Kind,
4457 Expr *Initializer, bool AllowRValues, bool IsLValueRef,
4458 InitializationSequence &Sequence) {
4459 QualType DestType = Entity.getType();
4460 QualType cv1T1 = DestType->castAs<ReferenceType>()->getPointeeType();
4461 QualType T1 = cv1T1.getUnqualifiedType();
4462 QualType cv2T2 = Initializer->getType();
4463 QualType T2 = cv2T2.getUnqualifiedType();
4464
4465 assert(!S.CompareReferenceRelationship(Initializer->getBeginLoc(), T1, T2) &&((!S.CompareReferenceRelationship(Initializer->getBeginLoc
(), T1, T2) && "Must have incompatible references when binding via conversion"
) ? static_cast<void> (0) : __assert_fail ("!S.CompareReferenceRelationship(Initializer->getBeginLoc(), T1, T2) && \"Must have incompatible references when binding via conversion\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 4466, __PRETTY_FUNCTION__))
4466 "Must have incompatible references when binding via conversion")((!S.CompareReferenceRelationship(Initializer->getBeginLoc
(), T1, T2) && "Must have incompatible references when binding via conversion"
) ? static_cast<void> (0) : __assert_fail ("!S.CompareReferenceRelationship(Initializer->getBeginLoc(), T1, T2) && \"Must have incompatible references when binding via conversion\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 4466, __PRETTY_FUNCTION__))
;
4467
4468 // Build the candidate set directly in the initialization sequence
4469 // structure, so that it will persist if we fail.
4470 OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
4471 CandidateSet.clear(OverloadCandidateSet::CSK_InitByUserDefinedConversion);
4472
4473 // Determine whether we are allowed to call explicit conversion operators.
4474 // Note that none of [over.match.copy], [over.match.conv], nor
4475 // [over.match.ref] permit an explicit constructor to be chosen when
4476 // initializing a reference, not even for direct-initialization.
4477 bool AllowExplicitCtors = false;
4478 bool AllowExplicitConvs = Kind.allowExplicitConversionFunctionsInRefBinding();
4479
4480 const RecordType *T1RecordType = nullptr;
4481 if (AllowRValues && (T1RecordType = T1->getAs<RecordType>()) &&
4482 S.isCompleteType(Kind.getLocation(), T1)) {
4483 // The type we're converting to is a class type. Enumerate its constructors
4484 // to see if there is a suitable conversion.
4485 CXXRecordDecl *T1RecordDecl = cast<CXXRecordDecl>(T1RecordType->getDecl());
4486
4487 for (NamedDecl *D : S.LookupConstructors(T1RecordDecl)) {
4488 auto Info = getConstructorInfo(D);
4489 if (!Info.Constructor)
4490 continue;
4491
4492 if (!Info.Constructor->isInvalidDecl() &&
4493 Info.Constructor->isConvertingConstructor(/*AllowExplicit*/true)) {
4494 if (Info.ConstructorTmpl)
4495 S.AddTemplateOverloadCandidate(
4496 Info.ConstructorTmpl, Info.FoundDecl,
4497 /*ExplicitArgs*/ nullptr, Initializer, CandidateSet,
4498 /*SuppressUserConversions=*/true,
4499 /*PartialOverloading*/ false, AllowExplicitCtors);
4500 else
4501 S.AddOverloadCandidate(
4502 Info.Constructor, Info.FoundDecl, Initializer, CandidateSet,
4503 /*SuppressUserConversions=*/true,
4504 /*PartialOverloading*/ false, AllowExplicitCtors);
4505 }
4506 }
4507 }
4508 if (T1RecordType && T1RecordType->getDecl()->isInvalidDecl())
4509 return OR_No_Viable_Function;
4510
4511 const RecordType *T2RecordType = nullptr;
4512 if ((T2RecordType = T2->getAs<RecordType>()) &&
4513 S.isCompleteType(Kind.getLocation(), T2)) {
4514 // The type we're converting from is a class type, enumerate its conversion
4515 // functions.
4516 CXXRecordDecl *T2RecordDecl = cast<CXXRecordDecl>(T2RecordType->getDecl());
4517
4518 const auto &Conversions = T2RecordDecl->getVisibleConversionFunctions();
4519 for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) {
4520 NamedDecl *D = *I;
4521 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
4522 if (isa<UsingShadowDecl>(D))
4523 D = cast<UsingShadowDecl>(D)->getTargetDecl();
4524
4525 FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
4526 CXXConversionDecl *Conv;
4527 if (ConvTemplate)
4528 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
4529 else
4530 Conv = cast<CXXConversionDecl>(D);
4531
4532 // If the conversion function doesn't return a reference type,
4533 // it can't be considered for this conversion unless we're allowed to
4534 // consider rvalues.
4535 // FIXME: Do we need to make sure that we only consider conversion
4536 // candidates with reference-compatible results? That might be needed to
4537 // break recursion.
4538 if ((AllowRValues ||
4539 Conv->getConversionType()->isLValueReferenceType())) {
4540 if (ConvTemplate)
4541 S.AddTemplateConversionCandidate(
4542 ConvTemplate, I.getPair(), ActingDC, Initializer, DestType,
4543 CandidateSet,
4544 /*AllowObjCConversionOnExplicit=*/false, AllowExplicitConvs);
4545 else
4546 S.AddConversionCandidate(
4547 Conv, I.getPair(), ActingDC, Initializer, DestType, CandidateSet,
4548 /*AllowObjCConversionOnExplicit=*/false, AllowExplicitConvs);
4549 }
4550 }
4551 }
4552 if (T2RecordType && T2RecordType->getDecl()->isInvalidDecl())
4553 return OR_No_Viable_Function;
4554
4555 SourceLocation DeclLoc = Initializer->getBeginLoc();
4556
4557 // Perform overload resolution. If it fails, return the failed result.
4558 OverloadCandidateSet::iterator Best;
4559 if (OverloadingResult Result
4560 = CandidateSet.BestViableFunction(S, DeclLoc, Best))
4561 return Result;
4562
4563 FunctionDecl *Function = Best->Function;
4564 // This is the overload that will be used for this initialization step if we
4565 // use this initialization. Mark it as referenced.
4566 Function->setReferenced();
4567
4568 // Compute the returned type and value kind of the conversion.
4569 QualType cv3T3;
4570 if (isa<CXXConversionDecl>(Function))
4571 cv3T3 = Function->getReturnType();
4572 else
4573 cv3T3 = T1;
4574
4575 ExprValueKind VK = VK_RValue;
4576 if (cv3T3->isLValueReferenceType())
4577 VK = VK_LValue;
4578 else if (const auto *RRef = cv3T3->getAs<RValueReferenceType>())
4579 VK = RRef->getPointeeType()->isFunctionType() ? VK_LValue : VK_XValue;
4580 cv3T3 = cv3T3.getNonLValueExprType(S.Context);
4581
4582 // Add the user-defined conversion step.
4583 bool HadMultipleCandidates = (CandidateSet.size() > 1);
4584 Sequence.AddUserConversionStep(Function, Best->FoundDecl, cv3T3,
4585 HadMultipleCandidates);
4586
4587 // Determine whether we'll need to perform derived-to-base adjustments or
4588 // other conversions.
4589 Sema::ReferenceConversions RefConv;
4590 Sema::ReferenceCompareResult NewRefRelationship =
4591 S.CompareReferenceRelationship(DeclLoc, T1, cv3T3, &RefConv);
4592
4593 // Add the final conversion sequence, if necessary.
4594 if (NewRefRelationship == Sema::Ref_Incompatible) {
4595 assert(!isa<CXXConstructorDecl>(Function) &&((!isa<CXXConstructorDecl>(Function) && "should not have conversion after constructor"
) ? static_cast<void> (0) : __assert_fail ("!isa<CXXConstructorDecl>(Function) && \"should not have conversion after constructor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 4596, __PRETTY_FUNCTION__))
4596 "should not have conversion after constructor")((!isa<CXXConstructorDecl>(Function) && "should not have conversion after constructor"
) ? static_cast<void> (0) : __assert_fail ("!isa<CXXConstructorDecl>(Function) && \"should not have conversion after constructor\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 4596, __PRETTY_FUNCTION__))
;
4597
4598 ImplicitConversionSequence ICS;
4599 ICS.setStandard();
4600 ICS.Standard = Best->FinalConversion;
4601 Sequence.AddConversionSequenceStep(ICS, ICS.Standard.getToType(2));
4602
4603 // Every implicit conversion results in a prvalue, except for a glvalue
4604 // derived-to-base conversion, which we handle below.
4605 cv3T3 = ICS.Standard.getToType(2);
4606 VK = VK_RValue;
4607 }
4608
4609 // If the converted initializer is a prvalue, its type T4 is adjusted to
4610 // type "cv1 T4" and the temporary materialization conversion is applied.
4611 //
4612 // We adjust the cv-qualifications to match the reference regardless of
4613 // whether we have a prvalue so that the AST records the change. In this
4614 // case, T4 is "cv3 T3".
4615 QualType cv1T4 = S.Context.getQualifiedType(cv3T3, cv1T1.getQualifiers());
4616 if (cv1T4.getQualifiers() != cv3T3.getQualifiers())
4617 Sequence.AddQualificationConversionStep(cv1T4, VK);
4618 Sequence.AddReferenceBindingStep(cv1T4, VK == VK_RValue);
4619 VK = IsLValueRef ? VK_LValue : VK_XValue;
4620
4621 if (RefConv & Sema::ReferenceConversions::DerivedToBase)
4622 Sequence.AddDerivedToBaseCastStep(cv1T1, VK);
4623 else if (RefConv & Sema::ReferenceConversions::ObjC)
4624 Sequence.AddObjCObjectConversionStep(cv1T1);
4625 else if (RefConv & Sema::ReferenceConversions::Function)
4626 Sequence.AddQualificationConversionStep(cv1T1, VK);
4627 else if (RefConv & Sema::ReferenceConversions::Qualification) {
4628 if (!S.Context.hasSameType(cv1T4, cv1T1))
4629 Sequence.AddQualificationConversionStep(cv1T1, VK);
4630 }
4631
4632 return OR_Success;
4633}
4634
4635static void CheckCXX98CompatAccessibleCopy(Sema &S,
4636 const InitializedEntity &Entity,
4637 Expr *CurInitExpr);
4638
4639/// Attempt reference initialization (C++0x [dcl.init.ref])
4640static void TryReferenceInitialization(Sema &S,
4641 const InitializedEntity &Entity,
4642 const InitializationKind &Kind,
4643 Expr *Initializer,
4644 InitializationSequence &Sequence) {
4645 QualType DestType = Entity.getType();
4646 QualType cv1T1 = DestType->castAs<ReferenceType>()->getPointeeType();
4647 Qualifiers T1Quals;
4648 QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals);
4649 QualType cv2T2 = Initializer->getType();
4650 Qualifiers T2Quals;
4651 QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals);
4652
4653 // If the initializer is the address of an overloaded function, try
4654 // to resolve the overloaded function. If all goes well, T2 is the
4655 // type of the resulting function.
4656 if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2,
4657 T1, Sequence))
4658 return;
4659
4660 // Delegate everything else to a subfunction.
4661 TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1,
4662 T1Quals, cv2T2, T2, T2Quals, Sequence);
4663}
4664
4665/// Determine whether an expression is a non-referenceable glvalue (one to
4666/// which a reference can never bind). Attempting to bind a reference to
4667/// such a glvalue will always create a temporary.
4668static bool isNonReferenceableGLValue(Expr *E) {
4669 return E->refersToBitField() || E->refersToVectorElement();
4670}
4671
4672/// Reference initialization without resolving overloaded functions.
4673static void TryReferenceInitializationCore(Sema &S,
4674 const InitializedEntity &Entity,
4675 const InitializationKind &Kind,
4676 Expr *Initializer,
4677 QualType cv1T1, QualType T1,
4678 Qualifiers T1Quals,
4679 QualType cv2T2, QualType T2,
4680 Qualifiers T2Quals,
4681 InitializationSequence &Sequence) {
4682 QualType DestType = Entity.getType();
4683 SourceLocation DeclLoc = Initializer->getBeginLoc();
4684
4685 // Compute some basic properties of the types and the initializer.
4686 bool isLValueRef = DestType->isLValueReferenceType();
4687 bool isRValueRef = !isLValueRef;
4688 Expr::Classification InitCategory = Initializer->Classify(S.Context);
4689
4690 Sema::ReferenceConversions RefConv;
4691 Sema::ReferenceCompareResult RefRelationship =
4692 S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2, &RefConv);
4693
4694 // C++0x [dcl.init.ref]p5:
4695 // A reference to type "cv1 T1" is initialized by an expression of type
4696 // "cv2 T2" as follows:
4697 //
4698 // - If the reference is an lvalue reference and the initializer
4699 // expression
4700 // Note the analogous bullet points for rvalue refs to functions. Because
4701 // there are no function rvalues in C++, rvalue refs to functions are treated
4702 // like lvalue refs.
4703 OverloadingResult ConvOvlResult = OR_Success;
4704 bool T1Function = T1->isFunctionType();
4705 if (isLValueRef || T1Function) {
4706 if (InitCategory.isLValue() && !isNonReferenceableGLValue(Initializer) &&
4707 (RefRelationship == Sema::Ref_Compatible ||
4708 (Kind.isCStyleOrFunctionalCast() &&
4709 RefRelationship == Sema::Ref_Related))) {
4710 // - is an lvalue (but is not a bit-field), and "cv1 T1" is
4711 // reference-compatible with "cv2 T2," or
4712 if (RefConv & (Sema::ReferenceConversions::DerivedToBase |
4713 Sema::ReferenceConversions::ObjC)) {
4714 // If we're converting the pointee, add any qualifiers first;
4715 // these qualifiers must all be top-level, so just convert to "cv1 T2".
4716 if (RefConv & (Sema::ReferenceConversions::Qualification))
4717 Sequence.AddQualificationConversionStep(
4718 S.Context.getQualifiedType(T2, T1Quals),
4719 Initializer->getValueKind());
4720 if (RefConv & Sema::ReferenceConversions::DerivedToBase)
4721 Sequence.AddDerivedToBaseCastStep(cv1T1, VK_LValue);
4722 else
4723 Sequence.AddObjCObjectConversionStep(cv1T1);
4724 } else if (RefConv & (Sema::ReferenceConversions::Qualification |
4725 Sema::ReferenceConversions::Function)) {
4726 // Perform a (possibly multi-level) qualification conversion.
4727 // FIXME: Should we use a different step kind for function conversions?
4728 Sequence.AddQualificationConversionStep(cv1T1,
4729 Initializer->getValueKind());
4730 }
4731
4732 // We only create a temporary here when binding a reference to a
4733 // bit-field or vector element. Those cases are't supposed to be
4734 // handled by this bullet, but the outcome is the same either way.
4735 Sequence.AddReferenceBindingStep(cv1T1, false);
4736 return;
4737 }
4738
4739 // - has a class type (i.e., T2 is a class type), where T1 is not
4740 // reference-related to T2, and can be implicitly converted to an
4741 // lvalue of type "cv3 T3," where "cv1 T1" is reference-compatible
4742 // with "cv3 T3" (this conversion is selected by enumerating the
4743 // applicable conversion functions (13.3.1.6) and choosing the best
4744 // one through overload resolution (13.3)),
4745 // If we have an rvalue ref to function type here, the rhs must be
4746 // an rvalue. DR1287 removed the "implicitly" here.
4747 if (RefRelationship == Sema::Ref_Incompatible && T2->isRecordType() &&
4748 (isLValueRef || InitCategory.isRValue())) {
4749 ConvOvlResult = TryRefInitWithConversionFunction(
4750 S, Entity, Kind, Initializer, /*AllowRValues*/ isRValueRef,
4751 /*IsLValueRef*/ isLValueRef, Sequence);
4752 if (ConvOvlResult == OR_Success)
4753 return;
4754 if (ConvOvlResult != OR_No_Viable_Function)
4755 Sequence.SetOverloadFailure(
4756 InitializationSequence::FK_ReferenceInitOverloadFailed,
4757 ConvOvlResult);
4758 }
4759 }
4760
4761 // - Otherwise, the reference shall be an lvalue reference to a
4762 // non-volatile const type (i.e., cv1 shall be const), or the reference
4763 // shall be an rvalue reference.
4764 // For address spaces, we interpret this to mean that an addr space
4765 // of a reference "cv1 T1" is a superset of addr space of "cv2 T2".
4766 if (isLValueRef && !(T1Quals.hasConst() && !T1Quals.hasVolatile() &&
4767 T1Quals.isAddressSpaceSupersetOf(T2Quals))) {
4768 if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy)
4769 Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
4770 else if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty())
4771 Sequence.SetOverloadFailure(
4772 InitializationSequence::FK_ReferenceInitOverloadFailed,
4773 ConvOvlResult);
4774 else if (!InitCategory.isLValue())
4775 Sequence.SetFailed(
4776 T1Quals.isAddressSpaceSupersetOf(T2Quals)
4777 ? InitializationSequence::
4778 FK_NonConstLValueReferenceBindingToTemporary
4779 : InitializationSequence::FK_ReferenceInitDropsQualifiers);
4780 else {
4781 InitializationSequence::FailureKind FK;
4782 switch (RefRelationship) {
4783 case Sema::Ref_Compatible:
4784 if (Initializer->refersToBitField())
4785 FK = InitializationSequence::
4786 FK_NonConstLValueReferenceBindingToBitfield;
4787 else if (Initializer->refersToVectorElement())
4788 FK = InitializationSequence::
4789 FK_NonConstLValueReferenceBindingToVectorElement;
4790 else
4791 llvm_unreachable("unexpected kind of compatible initializer")::llvm::llvm_unreachable_internal("unexpected kind of compatible initializer"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 4791)
;
4792 break;
4793 case Sema::Ref_Related:
4794 FK = InitializationSequence::FK_ReferenceInitDropsQualifiers;
4795 break;
4796 case Sema::Ref_Incompatible:
4797 FK = InitializationSequence::
4798 FK_NonConstLValueReferenceBindingToUnrelated;
4799 break;
4800 }
4801 Sequence.SetFailed(FK);
4802 }
4803 return;
4804 }
4805
4806 // - If the initializer expression
4807 // - is an
4808 // [<=14] xvalue (but not a bit-field), class prvalue, array prvalue, or
4809 // [1z] rvalue (but not a bit-field) or
4810 // function lvalue and "cv1 T1" is reference-compatible with "cv2 T2"
4811 //
4812 // Note: functions are handled above and below rather than here...
4813 if (!T1Function &&
4814 (RefRelationship == Sema::Ref_Compatible ||
4815 (Kind.isCStyleOrFunctionalCast() &&
4816 RefRelationship == Sema::Ref_Related)) &&
4817 ((InitCategory.isXValue() && !isNonReferenceableGLValue(Initializer)) ||
4818 (InitCategory.isPRValue() &&
4819 (S.getLangOpts().CPlusPlus17 || T2->isRecordType() ||
4820 T2->isArrayType())))) {
4821 ExprValueKind ValueKind = InitCategory.isXValue() ? VK_XValue : VK_RValue;
4822 if (InitCategory.isPRValue() && T2->isRecordType()) {
4823 // The corresponding bullet in C++03 [dcl.init.ref]p5 gives the
4824 // compiler the freedom to perform a copy here or bind to the
4825 // object, while C++0x requires that we bind directly to the
4826 // object. Hence, we always bind to the object without making an
4827 // extra copy. However, in C++03 requires that we check for the
4828 // presence of a suitable copy constructor:
4829 //
4830 // The constructor that would be used to make the copy shall
4831 // be callable whether or not the copy is actually done.
4832 if (!S.getLangOpts().CPlusPlus11 && !S.getLangOpts().MicrosoftExt)
4833 Sequence.AddExtraneousCopyToTemporary(cv2T2);
4834 else if (S.getLangOpts().CPlusPlus11)
4835 CheckCXX98CompatAccessibleCopy(S, Entity, Initializer);
4836 }
4837
4838 // C++1z [dcl.init.ref]/5.2.1.2:
4839 // If the converted initializer is a prvalue, its type T4 is adjusted
4840 // to type "cv1 T4" and the temporary materialization conversion is
4841 // applied.
4842 // Postpone address space conversions to after the temporary materialization
4843 // conversion to allow creating temporaries in the alloca address space.
4844 auto T1QualsIgnoreAS = T1Quals;
4845 auto T2QualsIgnoreAS = T2Quals;
4846 if (T1Quals.getAddressSpace() != T2Quals.getAddressSpace()) {
4847 T1QualsIgnoreAS.removeAddressSpace();
4848 T2QualsIgnoreAS.removeAddressSpace();
4849 }
4850 QualType cv1T4 = S.Context.getQualifiedType(cv2T2, T1QualsIgnoreAS);
4851 if (T1QualsIgnoreAS != T2QualsIgnoreAS)
4852 Sequence.AddQualificationConversionStep(cv1T4, ValueKind);
4853 Sequence.AddReferenceBindingStep(cv1T4, ValueKind == VK_RValue);
4854 ValueKind = isLValueRef ? VK_LValue : VK_XValue;
4855 // Add addr space conversion if required.
4856 if (T1Quals.getAddressSpace() != T2Quals.getAddressSpace()) {
4857 auto T4Quals = cv1T4.getQualifiers();
4858 T4Quals.addAddressSpace(T1Quals.getAddressSpace());
4859 QualType cv1T4WithAS = S.Context.getQualifiedType(T2, T4Quals);
4860 Sequence.AddQualificationConversionStep(cv1T4WithAS, ValueKind);
4861 cv1T4 = cv1T4WithAS;
4862 }
4863
4864 // In any case, the reference is bound to the resulting glvalue (or to
4865 // an appropriate base class subobject).
4866 if (RefConv & Sema::ReferenceConversions::DerivedToBase)
4867 Sequence.AddDerivedToBaseCastStep(cv1T1, ValueKind);
4868 else if (RefConv & Sema::ReferenceConversions::ObjC)
4869 Sequence.AddObjCObjectConversionStep(cv1T1);
4870 else if (RefConv & Sema::ReferenceConversions::Qualification) {
4871 if (!S.Context.hasSameType(cv1T4, cv1T1))
4872 Sequence.AddQualificationConversionStep(cv1T1, ValueKind);
4873 }
4874 return;
4875 }
4876
4877 // - has a class type (i.e., T2 is a class type), where T1 is not
4878 // reference-related to T2, and can be implicitly converted to an
4879 // xvalue, class prvalue, or function lvalue of type "cv3 T3",
4880 // where "cv1 T1" is reference-compatible with "cv3 T3",
4881 //
4882 // DR1287 removes the "implicitly" here.
4883 if (T2->isRecordType()) {
4884 if (RefRelationship == Sema::Ref_Incompatible) {
4885 ConvOvlResult = TryRefInitWithConversionFunction(
4886 S, Entity, Kind, Initializer, /*AllowRValues*/ true,
4887 /*IsLValueRef*/ isLValueRef, Sequence);
4888 if (ConvOvlResult)
4889 Sequence.SetOverloadFailure(
4890 InitializationSequence::FK_ReferenceInitOverloadFailed,
4891 ConvOvlResult);
4892
4893 return;
4894 }
4895
4896 if (RefRelationship == Sema::Ref_Compatible &&
4897 isRValueRef && InitCategory.isLValue()) {
4898 Sequence.SetFailed(
4899 InitializationSequence::FK_RValueReferenceBindingToLValue);
4900 return;
4901 }
4902
4903 Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
4904 return;
4905 }
4906
4907 // - Otherwise, a temporary of type "cv1 T1" is created and initialized
4908 // from the initializer expression using the rules for a non-reference
4909 // copy-initialization (8.5). The reference is then bound to the
4910 // temporary. [...]
4911
4912 // Ignore address space of reference type at this point and perform address
4913 // space conversion after the reference binding step.
4914 QualType cv1T1IgnoreAS =
4915 T1Quals.hasAddressSpace()
4916 ? S.Context.getQualifiedType(T1, T1Quals.withoutAddressSpace())
4917 : cv1T1;
4918
4919 InitializedEntity TempEntity =
4920 InitializedEntity::InitializeTemporary(cv1T1IgnoreAS);
4921
4922 // FIXME: Why do we use an implicit conversion here rather than trying
4923 // copy-initialization?
4924 ImplicitConversionSequence ICS
4925 = S.TryImplicitConversion(Initializer, TempEntity.getType(),
4926 /*SuppressUserConversions=*/false,
4927 /*AllowExplicit=*/false,
4928 /*FIXME:InOverloadResolution=*/false,
4929 /*CStyle=*/Kind.isCStyleOrFunctionalCast(),
4930 /*AllowObjCWritebackConversion=*/false);
4931
4932 if (ICS.isBad()) {
4933 // FIXME: Use the conversion function set stored in ICS to turn
4934 // this into an overloading ambiguity diagnostic. However, we need
4935 // to keep that set as an OverloadCandidateSet rather than as some
4936 // other kind of set.
4937 if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty())
4938 Sequence.SetOverloadFailure(
4939 InitializationSequence::FK_ReferenceInitOverloadFailed,
4940 ConvOvlResult);
4941 else if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy)
4942 Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
4943 else
4944 Sequence.SetFailed(InitializationSequence::FK_ReferenceInitFailed);
4945 return;
4946 } else {
4947 Sequence.AddConversionSequenceStep(ICS, TempEntity.getType());
4948 }
4949
4950 // [...] If T1 is reference-related to T2, cv1 must be the
4951 // same cv-qualification as, or greater cv-qualification
4952 // than, cv2; otherwise, the program is ill-formed.
4953 unsigned T1CVRQuals = T1Quals.getCVRQualifiers();
4954 unsigned T2CVRQuals = T2Quals.getCVRQualifiers();
4955 if ((RefRelationship == Sema::Ref_Related &&
4956 (T1CVRQuals | T2CVRQuals) != T1CVRQuals) ||
4957 !T1Quals.isAddressSpaceSupersetOf(T2Quals)) {
4958 Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers);
4959 return;
4960 }
4961
4962 // [...] If T1 is reference-related to T2 and the reference is an rvalue
4963 // reference, the initializer expression shall not be an lvalue.
4964 if (RefRelationship >= Sema::Ref_Related && !isLValueRef &&
4965 InitCategory.isLValue()) {
4966 Sequence.SetFailed(
4967 InitializationSequence::FK_RValueReferenceBindingToLValue);
4968 return;
4969 }
4970
4971 Sequence.AddReferenceBindingStep(cv1T1IgnoreAS, /*BindingTemporary=*/true);
4972
4973 if (T1Quals.hasAddressSpace()) {
4974 if (!Qualifiers::isAddressSpaceSupersetOf(T1Quals.getAddressSpace(),
4975 LangAS::Default)) {
4976 Sequence.SetFailed(
4977 InitializationSequence::FK_ReferenceAddrspaceMismatchTemporary);
4978 return;
4979 }
4980 Sequence.AddQualificationConversionStep(cv1T1, isLValueRef ? VK_LValue
4981 : VK_XValue);
4982 }
4983}
4984
4985/// Attempt character array initialization from a string literal
4986/// (C++ [dcl.init.string], C99 6.7.8).
4987static void TryStringLiteralInitialization(Sema &S,
4988 const InitializedEntity &Entity,
4989 const InitializationKind &Kind,
4990 Expr *Initializer,
4991 InitializationSequence &Sequence) {
4992 Sequence.AddStringInitStep(Entity.getType());
4993}
4994
4995/// Attempt value initialization (C++ [dcl.init]p7).
4996static void TryValueInitialization(Sema &S,
4997 const InitializedEntity &Entity,
4998 const InitializationKind &Kind,
4999 InitializationSequence &Sequence,
5000 InitListExpr *InitList) {
5001 assert((!InitList || InitList->getNumInits() == 0) &&(((!InitList || InitList->getNumInits() == 0) && "Shouldn't use value-init for non-empty init lists"
) ? static_cast<void> (0) : __assert_fail ("(!InitList || InitList->getNumInits() == 0) && \"Shouldn't use value-init for non-empty init lists\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 5002, __PRETTY_FUNCTION__))
5002 "Shouldn't use value-init for non-empty init lists")(((!InitList || InitList->getNumInits() == 0) && "Shouldn't use value-init for non-empty init lists"
) ? static_cast<void> (0) : __assert_fail ("(!InitList || InitList->getNumInits() == 0) && \"Shouldn't use value-init for non-empty init lists\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 5002, __PRETTY_FUNCTION__))
;
5003
5004 // C++98 [dcl.init]p5, C++11 [dcl.init]p7:
5005 //
5006 // To value-initialize an object of type T means:
5007 QualType T = Entity.getType();
5008
5009 // -- if T is an array type, then each element is value-initialized;
5010 T = S.Context.getBaseElementType(T);
5011
5012 if (const RecordType *RT = T->getAs<RecordType>()) {
5013 if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
5014 bool NeedZeroInitialization = true;
5015 // C++98:
5016 // -- if T is a class type (clause 9) with a user-declared constructor
5017 // (12.1), then the default constructor for T is called (and the
5018 // initialization is ill-formed if T has no accessible default
5019 // constructor);
5020 // C++11:
5021 // -- if T is a class type (clause 9) with either no default constructor
5022 // (12.1 [class.ctor]) or a default constructor that is user-provided
5023 // or deleted, then the object is default-initialized;
5024 //
5025 // Note that the C++11 rule is the same as the C++98 rule if there are no
5026 // defaulted or deleted constructors, so we just use it unconditionally.
5027 CXXConstructorDecl *CD = S.LookupDefaultConstructor(ClassDecl);
5028 if (!CD || !CD->getCanonicalDecl()->isDefaulted() || CD->isDeleted())
5029 NeedZeroInitialization = false;
5030
5031 // -- if T is a (possibly cv-qualified) non-union class type without a
5032 // user-provided or deleted default constructor, then the object is
5033 // zero-initialized and, if T has a non-trivial default constructor,
5034 // default-initialized;
5035 // The 'non-union' here was removed by DR1502. The 'non-trivial default
5036 // constructor' part was removed by DR1507.
5037 if (NeedZeroInitialization)
5038 Sequence.AddZeroInitializationStep(Entity.getType());
5039
5040 // C++03:
5041 // -- if T is a non-union class type without a user-declared constructor,
5042 // then every non-static data member and base class component of T is
5043 // value-initialized;
5044 // [...] A program that calls for [...] value-initialization of an
5045 // entity of reference type is ill-formed.
5046 //
5047 // C++11 doesn't need this handling, because value-initialization does not
5048 // occur recursively there, and the implicit default constructor is
5049 // defined as deleted in the problematic cases.
5050 if (!S.getLangOpts().CPlusPlus11 &&
5051 ClassDecl->hasUninitializedReferenceMember()) {
5052 Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForReference);
5053 return;
5054 }
5055
5056 // If this is list-value-initialization, pass the empty init list on when
5057 // building the constructor call. This affects the semantics of a few
5058 // things (such as whether an explicit default constructor can be called).
5059 Expr *InitListAsExpr = InitList;
5060 MultiExprArg Args(&InitListAsExpr, InitList ? 1 : 0);
5061 bool InitListSyntax = InitList;
5062
5063 // FIXME: Instead of creating a CXXConstructExpr of array type here,
5064 // wrap a class-typed CXXConstructExpr in an ArrayInitLoopExpr.
5065 return TryConstructorInitialization(
5066 S, Entity, Kind, Args, T, Entity.getType(), Sequence, InitListSyntax);
5067 }
5068 }
5069
5070 Sequence.AddZeroInitializationStep(Entity.getType());
5071}
5072
5073/// Attempt default initialization (C++ [dcl.init]p6).
5074static void TryDefaultInitialization(Sema &S,
5075 const InitializedEntity &Entity,
5076 const InitializationKind &Kind,
5077 InitializationSequence &Sequence) {
5078 assert(Kind.getKind() == InitializationKind::IK_Default)((Kind.getKind() == InitializationKind::IK_Default) ? static_cast
<void> (0) : __assert_fail ("Kind.getKind() == InitializationKind::IK_Default"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 5078, __PRETTY_FUNCTION__))
;
5079
5080 // C++ [dcl.init]p6:
5081 // To default-initialize an object of type T means:
5082 // - if T is an array type, each element is default-initialized;
5083 QualType DestType = S.Context.getBaseElementType(Entity.getType());
5084
5085 // - if T is a (possibly cv-qualified) class type (Clause 9), the default
5086 // constructor for T is called (and the initialization is ill-formed if
5087 // T has no accessible default constructor);
5088 if (DestType->isRecordType() && S.getLangOpts().CPlusPlus) {
5089 TryConstructorInitialization(S, Entity, Kind, None, DestType,
5090 Entity.getType(), Sequence);
5091 return;
5092 }
5093
5094 // - otherwise, no initialization is performed.
5095
5096 // If a program calls for the default initialization of an object of
5097 // a const-qualified type T, T shall be a class type with a user-provided
5098 // default constructor.
5099 if (DestType.isConstQualified() && S.getLangOpts().CPlusPlus) {
5100 if (!maybeRecoverWithZeroInitialization(S, Sequence, Entity))
5101 Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst);
5102 return;
5103 }
5104
5105 // If the destination type has a lifetime property, zero-initialize it.
5106 if (DestType.getQualifiers().hasObjCLifetime()) {
5107 Sequence.AddZeroInitializationStep(Entity.getType());
5108 return;
5109 }
5110}
5111
5112/// Attempt a user-defined conversion between two types (C++ [dcl.init]),
5113/// which enumerates all conversion functions and performs overload resolution
5114/// to select the best.
5115static void TryUserDefinedConversion(Sema &S,
5116 QualType DestType,
5117 const InitializationKind &Kind,
5118 Expr *Initializer,
5119 InitializationSequence &Sequence,
5120 bool TopLevelOfInitList) {
5121 assert(!DestType->isReferenceType() && "References are handled elsewhere")((!DestType->isReferenceType() && "References are handled elsewhere"
) ? static_cast<void> (0) : __assert_fail ("!DestType->isReferenceType() && \"References are handled elsewhere\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 5121, __PRETTY_FUNCTION__))
;
5122 QualType SourceType = Initializer->getType();
5123 assert((DestType->isRecordType() || SourceType->isRecordType()) &&(((DestType->isRecordType() || SourceType->isRecordType
()) && "Must have a class type to perform a user-defined conversion"
) ? static_cast<void> (0) : __assert_fail ("(DestType->isRecordType() || SourceType->isRecordType()) && \"Must have a class type to perform a user-defined conversion\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 5124, __PRETTY_FUNCTION__))
5124 "Must have a class type to perform a user-defined conversion")(((DestType->isRecordType() || SourceType->isRecordType
()) && "Must have a class type to perform a user-defined conversion"
) ? static_cast<void> (0) : __assert_fail ("(DestType->isRecordType() || SourceType->isRecordType()) && \"Must have a class type to perform a user-defined conversion\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 5124, __PRETTY_FUNCTION__))
;
5125
5126 // Build the candidate set directly in the initialization sequence
5127 // structure, so that it will persist if we fail.
5128 OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet();
5129 CandidateSet.clear(OverloadCandidateSet::CSK_InitByUserDefinedConversion);
5130 CandidateSet.setDestAS(DestType.getQualifiers().getAddressSpace());
5131
5132 // Determine whether we are allowed to call explicit constructors or
5133 // explicit conversion operators.
5134 bool AllowExplicit = Kind.AllowExplicit();
5135
5136 if (const RecordType *DestRecordType = DestType->getAs<RecordType>()) {
5137 // The type we're converting to is a class type. Enumerate its constructors
5138 // to see if there is a suitable conversion.
5139 CXXRecordDecl *DestRecordDecl
5140 = cast<CXXRecordDecl>(DestRecordType->getDecl());
5141
5142 // Try to complete the type we're converting to.
5143 if (S.isCompleteType(Kind.getLocation(), DestType)) {
5144 for (NamedDecl *D : S.LookupConstructors(DestRecordDecl)) {
5145 auto Info = getConstructorInfo(D);
5146 if (!Info.Constructor)
5147 continue;
5148
5149 if (!Info.Constructor->isInvalidDecl() &&
5150 Info.Constructor->isConvertingConstructor(/*AllowExplicit*/true)) {
5151 if (Info.ConstructorTmpl)
5152 S.AddTemplateOverloadCandidate(
5153 Info.ConstructorTmpl, Info.FoundDecl,
5154 /*ExplicitArgs*/ nullptr, Initializer, CandidateSet,
5155 /*SuppressUserConversions=*/true,
5156 /*PartialOverloading*/ false, AllowExplicit);
5157 else
5158 S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl,
5159 Initializer, CandidateSet,
5160 /*SuppressUserConversions=*/true,
5161 /*PartialOverloading*/ false, AllowExplicit);
5162 }
5163 }
5164 }
5165 }
5166
5167 SourceLocation DeclLoc = Initializer->getBeginLoc();
5168
5169 if (const RecordType *SourceRecordType = SourceType->getAs<RecordType>()) {
5170 // The type we're converting from is a class type, enumerate its conversion
5171 // functions.
5172
5173 // We can only enumerate the conversion functions for a complete type; if
5174 // the type isn't complete, simply skip this step.
5175 if (S.isCompleteType(DeclLoc, SourceType)) {
5176 CXXRecordDecl *SourceRecordDecl
5177 = cast<CXXRecordDecl>(SourceRecordType->getDecl());
5178
5179 const auto &Conversions =
5180 SourceRecordDecl->getVisibleConversionFunctions();
5181 for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) {
5182 NamedDecl *D = *I;
5183 CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext());
5184 if (isa<UsingShadowDecl>(D))
5185 D = cast<UsingShadowDecl>(D)->getTargetDecl();
5186
5187 FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D);
5188 CXXConversionDecl *Conv;
5189 if (ConvTemplate)
5190 Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl());
5191 else
5192 Conv = cast<CXXConversionDecl>(D);
5193
5194 if (ConvTemplate)
5195 S.AddTemplateConversionCandidate(
5196 ConvTemplate, I.getPair(), ActingDC, Initializer, DestType,
5197 CandidateSet, AllowExplicit, AllowExplicit);
5198 else
5199 S.AddConversionCandidate(Conv, I.getPair(), ActingDC, Initializer,
5200 DestType, CandidateSet, AllowExplicit,
5201 AllowExplicit);
5202 }
5203 }
5204 }
5205
5206 // Perform overload resolution. If it fails, return the failed result.
5207 OverloadCandidateSet::iterator Best;
5208 if (OverloadingResult Result
5209 = CandidateSet.BestViableFunction(S, DeclLoc, Best)) {
5210 Sequence.SetOverloadFailure(
5211 InitializationSequence::FK_UserConversionOverloadFailed,
5212 Result);
5213 return;
5214 }
5215
5216 FunctionDecl *Function = Best->Function;
5217 Function->setReferenced();
5218 bool HadMultipleCandidates = (CandidateSet.size() > 1);
5219
5220 if (isa<CXXConstructorDecl>(Function)) {
5221 // Add the user-defined conversion step. Any cv-qualification conversion is
5222 // subsumed by the initialization. Per DR5, the created temporary is of the
5223 // cv-unqualified type of the destination.
5224 Sequence.AddUserConversionStep(Function, Best->FoundDecl,
5225 DestType.getUnqualifiedType(),
5226 HadMultipleCandidates);
5227
5228 // C++14 and before:
5229 // - if the function is a constructor, the call initializes a temporary
5230 // of the cv-unqualified version of the destination type. The [...]
5231 // temporary [...] is then used to direct-initialize, according to the
5232 // rules above, the object that is the destination of the
5233 // copy-initialization.
5234 // Note that this just performs a simple object copy from the temporary.
5235 //
5236 // C++17:
5237 // - if the function is a constructor, the call is a prvalue of the
5238 // cv-unqualified version of the destination type whose return object
5239 // is initialized by the constructor. The call is used to
5240 // direct-initialize, according to the rules above, the object that
5241 // is the destination of the copy-initialization.
5242 // Therefore we need to do nothing further.
5243 //
5244 // FIXME: Mark this copy as extraneous.
5245 if (!S.getLangOpts().CPlusPlus17)
5246 Sequence.AddFinalCopy(DestType);
5247 else if (DestType.hasQualifiers())
5248 Sequence.AddQualificationConversionStep(DestType, VK_RValue);
5249 return;
5250 }
5251
5252 // Add the user-defined conversion step that calls the conversion function.
5253 QualType ConvType = Function->getCallResultType();
5254 Sequence.AddUserConversionStep(Function, Best->FoundDecl, ConvType,
5255 HadMultipleCandidates);
5256
5257 if (ConvType->getAs<RecordType>()) {
5258 // The call is used to direct-initialize [...] the object that is the
5259 // destination of the copy-initialization.
5260 //
5261 // In C++17, this does not call a constructor if we enter /17.6.1:
5262 // - If the initializer expression is a prvalue and the cv-unqualified
5263 // version of the source type is the same as the class of the
5264 // destination [... do not make an extra copy]
5265 //
5266 // FIXME: Mark this copy as extraneous.
5267 if (!S.getLangOpts().CPlusPlus17 ||
5268 Function->getReturnType()->isReferenceType() ||
5269 !S.Context.hasSameUnqualifiedType(ConvType, DestType))
5270 Sequence.AddFinalCopy(DestType);
5271 else if (!S.Context.hasSameType(ConvType, DestType))
5272 Sequence.AddQualificationConversionStep(DestType, VK_RValue);
5273 return;
5274 }
5275
5276 // If the conversion following the call to the conversion function
5277 // is interesting, add it as a separate step.
5278 if (Best->FinalConversion.First || Best->FinalConversion.Second ||
5279 Best->FinalConversion.Third) {
5280 ImplicitConversionSequence ICS;
5281 ICS.setStandard();
5282 ICS.Standard = Best->FinalConversion;
5283 Sequence.AddConversionSequenceStep(ICS, DestType, TopLevelOfInitList);
5284 }
5285}
5286
5287/// An egregious hack for compatibility with libstdc++-4.2: in <tr1/hashtable>,
5288/// a function with a pointer return type contains a 'return false;' statement.
5289/// In C++11, 'false' is not a null pointer, so this breaks the build of any
5290/// code using that header.
5291///
5292/// Work around this by treating 'return false;' as zero-initializing the result
5293/// if it's used in a pointer-returning function in a system header.
5294static bool isLibstdcxxPointerReturnFalseHack(Sema &S,
5295 const InitializedEntity &Entity,
5296 const Expr *Init) {
5297 return S.getLangOpts().CPlusPlus11 &&
67
Assuming field 'CPlusPlus11' is 0
68
Returning zero, which participates in a condition later
5298 Entity.getKind() == InitializedEntity::EK_Result &&
5299 Entity.getType()->isPointerType() &&
5300 isa<CXXBoolLiteralExpr>(Init) &&
5301 !cast<CXXBoolLiteralExpr>(Init)->getValue() &&
5302 S.getSourceManager().isInSystemHeader(Init->getExprLoc());
5303}
5304
5305/// The non-zero enum values here are indexes into diagnostic alternatives.
5306enum InvalidICRKind { IIK_okay, IIK_nonlocal, IIK_nonscalar };
5307
5308/// Determines whether this expression is an acceptable ICR source.
5309static InvalidICRKind isInvalidICRSource(ASTContext &C, Expr *e,
5310 bool isAddressOf, bool &isWeakAccess) {
5311 // Skip parens.
5312 e = e->IgnoreParens();
5313
5314 // Skip address-of nodes.
5315 if (UnaryOperator *op = dyn_cast<UnaryOperator>(e)) {
5316 if (op->getOpcode() == UO_AddrOf)
5317 return isInvalidICRSource(C, op->getSubExpr(), /*addressof*/ true,
5318 isWeakAccess);
5319
5320 // Skip certain casts.
5321 } else if (CastExpr *ce = dyn_cast<CastExpr>(e)) {
5322 switch (ce->getCastKind()) {
5323 case CK_Dependent:
5324 case CK_BitCast:
5325 case CK_LValueBitCast:
5326 case CK_NoOp:
5327 return isInvalidICRSource(C, ce->getSubExpr(), isAddressOf, isWeakAccess);
5328
5329 case CK_ArrayToPointerDecay:
5330 return IIK_nonscalar;
5331
5332 case CK_NullToPointer:
5333 return IIK_okay;
5334
5335 default:
5336 break;
5337 }
5338
5339 // If we have a declaration reference, it had better be a local variable.
5340 } else if (isa<DeclRefExpr>(e)) {
5341 // set isWeakAccess to true, to mean that there will be an implicit
5342 // load which requires a cleanup.
5343 if (e->getType().getObjCLifetime() == Qualifiers::OCL_Weak)
5344 isWeakAccess = true;
5345
5346 if (!isAddressOf) return IIK_nonlocal;
5347
5348 VarDecl *var = dyn_cast<VarDecl>(cast<DeclRefExpr>(e)->getDecl());
5349 if (!var) return IIK_nonlocal;
5350
5351 return (var->hasLocalStorage() ? IIK_okay : IIK_nonlocal);
5352
5353 // If we have a conditional operator, check both sides.
5354 } else if (ConditionalOperator *cond = dyn_cast<ConditionalOperator>(e)) {
5355 if (InvalidICRKind iik = isInvalidICRSource(C, cond->getLHS(), isAddressOf,
5356 isWeakAccess))
5357 return iik;
5358
5359 return isInvalidICRSource(C, cond->getRHS(), isAddressOf, isWeakAccess);
5360
5361 // These are never scalar.
5362 } else if (isa<ArraySubscriptExpr>(e)) {
5363 return IIK_nonscalar;
5364
5365 // Otherwise, it needs to be a null pointer constant.
5366 } else {
5367 return (e->isNullPointerConstant(C, Expr::NPC_ValueDependentIsNull)
5368 ? IIK_okay : IIK_nonlocal);
5369 }
5370
5371 return IIK_nonlocal;
5372}
5373
5374/// Check whether the given expression is a valid operand for an
5375/// indirect copy/restore.
5376static void checkIndirectCopyRestoreSource(Sema &S, Expr *src) {
5377 assert(src->isRValue())((src->isRValue()) ? static_cast<void> (0) : __assert_fail
("src->isRValue()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 5377, __PRETTY_FUNCTION__))
;
5378 bool isWeakAccess = false;
5379 InvalidICRKind iik = isInvalidICRSource(S.Context, src, false, isWeakAccess);
5380 // If isWeakAccess to true, there will be an implicit
5381 // load which requires a cleanup.
5382 if (S.getLangOpts().ObjCAutoRefCount && isWeakAccess)
5383 S.Cleanup.setExprNeedsCleanups(true);
5384
5385 if (iik == IIK_okay) return;
5386
5387 S.Diag(src->getExprLoc(), diag::err_arc_nonlocal_writeback)
5388 << ((unsigned) iik - 1) // shift index into diagnostic explanations
5389 << src->getSourceRange();
5390}
5391
5392/// Determine whether we have compatible array types for the
5393/// purposes of GNU by-copy array initialization.
5394static bool hasCompatibleArrayTypes(ASTContext &Context, const ArrayType *Dest,
5395 const ArrayType *Source) {
5396 // If the source and destination array types are equivalent, we're
5397 // done.
5398 if (Context.hasSameType(QualType(Dest, 0), QualType(Source, 0)))
5399 return true;
5400
5401 // Make sure that the element types are the same.
5402 if (!Context.hasSameType(Dest->getElementType(), Source->getElementType()))
5403 return false;
5404
5405 // The only mismatch we allow is when the destination is an
5406 // incomplete array type and the source is a constant array type.
5407 return Source->isConstantArrayType() && Dest->isIncompleteArrayType();
5408}
5409
5410static bool tryObjCWritebackConversion(Sema &S,
5411 InitializationSequence &Sequence,
5412 const InitializedEntity &Entity,
5413 Expr *Initializer) {
5414 bool ArrayDecay = false;
5415 QualType ArgType = Initializer->getType();
5416 QualType ArgPointee;
5417 if (const ArrayType *ArgArrayType = S.Context.getAsArrayType(ArgType)) {
5418 ArrayDecay = true;
5419 ArgPointee = ArgArrayType->getElementType();
5420 ArgType = S.Context.getPointerType(ArgPointee);
5421 }
5422
5423 // Handle write-back conversion.
5424 QualType ConvertedArgType;
5425 if (!S.isObjCWritebackConversion(ArgType, Entity.getType(),
5426 ConvertedArgType))
5427 return false;
5428
5429 // We should copy unless we're passing to an argument explicitly
5430 // marked 'out'.
5431 bool ShouldCopy = true;
5432 if (ParmVarDecl *param = cast_or_null<ParmVarDecl>(Entity.getDecl()))
5433 ShouldCopy = (param->getObjCDeclQualifier() != ParmVarDecl::OBJC_TQ_Out);
5434
5435 // Do we need an lvalue conversion?
5436 if (ArrayDecay || Initializer->isGLValue()) {
5437 ImplicitConversionSequence ICS;
5438 ICS.setStandard();
5439 ICS.Standard.setAsIdentityConversion();
5440
5441 QualType ResultType;
5442 if (ArrayDecay) {
5443 ICS.Standard.First = ICK_Array_To_Pointer;
5444 ResultType = S.Context.getPointerType(ArgPointee);
5445 } else {
5446 ICS.Standard.First = ICK_Lvalue_To_Rvalue;
5447 ResultType = Initializer->getType().getNonLValueExprType(S.Context);
5448 }
5449
5450 Sequence.AddConversionSequenceStep(ICS, ResultType);
5451 }
5452
5453 Sequence.AddPassByIndirectCopyRestoreStep(Entity.getType(), ShouldCopy);
5454 return true;
5455}
5456
5457static bool TryOCLSamplerInitialization(Sema &S,
5458 InitializationSequence &Sequence,
5459 QualType DestType,
5460 Expr *Initializer) {
5461 if (!S.getLangOpts().OpenCL || !DestType->isSamplerT() ||
23
Assuming field 'OpenCL' is not equal to 0
24
Taking true branch
5462 (!Initializer->isIntegerConstantExpr(S.Context) &&
5463 !Initializer->getType()->isSamplerT()))
5464 return false;
25
Returning zero, which participates in a condition later
5465
5466 Sequence.AddOCLSamplerInitStep(DestType);
5467 return true;
5468}
5469
5470static bool IsZeroInitializer(Expr *Initializer, Sema &S) {
5471 return Initializer->isIntegerConstantExpr(S.getASTContext()) &&
5472 (Initializer->EvaluateKnownConstInt(S.getASTContext()) == 0);
5473}
5474
5475static bool TryOCLZeroOpaqueTypeInitialization(Sema &S,
5476 InitializationSequence &Sequence,
5477 QualType DestType,
5478 Expr *Initializer) {
5479 if (!S.getLangOpts().OpenCL)
5480 return false;
5481
5482 //
5483 // OpenCL 1.2 spec, s6.12.10
5484 //
5485 // The event argument can also be used to associate the
5486 // async_work_group_copy with a previous async copy allowing
5487 // an event to be shared by multiple async copies; otherwise
5488 // event should be zero.
5489 //
5490 if (DestType->isEventT() || DestType->isQueueT()) {
5491 if (!IsZeroInitializer(Initializer, S))
5492 return false;
5493
5494 Sequence.AddOCLZeroOpaqueTypeStep(DestType);
5495 return true;
5496 }
5497
5498 // We should allow zero initialization for all types defined in the
5499 // cl_intel_device_side_avc_motion_estimation extension, except
5500 // intel_sub_group_avc_mce_payload_t and intel_sub_group_avc_mce_result_t.
5501 if (S.getOpenCLOptions().isEnabled(
5502 "cl_intel_device_side_avc_motion_estimation") &&
5503 DestType->isOCLIntelSubgroupAVCType()) {
5504 if (DestType->isOCLIntelSubgroupAVCMcePayloadType() ||
5505 DestType->isOCLIntelSubgroupAVCMceResultType())
5506 return false;
5507 if (!IsZeroInitializer(Initializer, S))
5508 return false;
5509
5510 Sequence.AddOCLZeroOpaqueTypeStep(DestType);
5511 return true;
5512 }
5513
5514 return false;
5515}
5516
5517InitializationSequence::InitializationSequence(Sema &S,
5518 const InitializedEntity &Entity,
5519 const InitializationKind &Kind,
5520 MultiExprArg Args,
5521 bool TopLevelOfInitList,
5522 bool TreatUnavailableAsInvalid)
5523 : FailedCandidateSet(Kind.getLocation(), OverloadCandidateSet::CSK_Normal) {
5524 InitializeFrom(S, Entity, Kind, Args, TopLevelOfInitList,
5525 TreatUnavailableAsInvalid);
5526}
5527
5528/// Tries to get a FunctionDecl out of `E`. If it succeeds and we can take the
5529/// address of that function, this returns true. Otherwise, it returns false.
5530static bool isExprAnUnaddressableFunction(Sema &S, const Expr *E) {
5531 auto *DRE = dyn_cast<DeclRefExpr>(E);
5532 if (!DRE || !isa<FunctionDecl>(DRE->getDecl()))
5533 return false;
5534
5535 return !S.checkAddressOfFunctionIsAvailable(
5536 cast<FunctionDecl>(DRE->getDecl()));
5537}
5538
5539/// Determine whether we can perform an elementwise array copy for this kind
5540/// of entity.
5541static bool canPerformArrayCopy(const InitializedEntity &Entity) {
5542 switch (Entity.getKind()) {
5543 case InitializedEntity::EK_LambdaCapture:
5544 // C++ [expr.prim.lambda]p24:
5545 // For array members, the array elements are direct-initialized in
5546 // increasing subscript order.
5547 return true;
5548
5549 case InitializedEntity::EK_Variable:
5550 // C++ [dcl.decomp]p1:
5551 // [...] each element is copy-initialized or direct-initialized from the
5552 // corresponding element of the assignment-expression [...]
5553 return isa<DecompositionDecl>(Entity.getDecl());
5554
5555 case InitializedEntity::EK_Member:
5556 // C++ [class.copy.ctor]p14:
5557 // - if the member is an array, each element is direct-initialized with
5558 // the corresponding subobject of x
5559 return Entity.isImplicitMemberInitializer();
5560
5561 case InitializedEntity::EK_ArrayElement:
5562 // All the above cases are intended to apply recursively, even though none
5563 // of them actually say that.
5564 if (auto *E = Entity.getParent())
5565 return canPerformArrayCopy(*E);
5566 break;
5567
5568 default:
5569 break;
5570 }
5571
5572 return false;
5573}
5574
5575void InitializationSequence::InitializeFrom(Sema &S,
5576 const InitializedEntity &Entity,
5577 const InitializationKind &Kind,
5578 MultiExprArg Args,
5579 bool TopLevelOfInitList,
5580 bool TreatUnavailableAsInvalid) {
5581 ASTContext &Context = S.Context;
5582
5583 // Eliminate non-overload placeholder types in the arguments. We
5584 // need to do this before checking whether types are dependent
5585 // because lowering a pseudo-object expression might well give us
5586 // something of dependent type.
5587 for (unsigned I = 0, E = Args.size(); I != E; ++I)
1
Assuming 'I' is equal to 'E'
2
Loop condition is false. Execution continues on line 5604
5588 if (Args[I]->getType()->isNonOverloadPlaceholderType()) {
5589 // FIXME: should we be doing this here?
5590 ExprResult result = S.CheckPlaceholderExpr(Args[I]);
5591 if (result.isInvalid()) {
5592 SetFailed(FK_PlaceholderType);
5593 return;
5594 }
5595 Args[I] = result.get();
5596 }
5597
5598 // C++0x [dcl.init]p16:
5599 // The semantics of initializers are as follows. The destination type is
5600 // the type of the object or reference being initialized and the source
5601 // type is the type of the initializer expression. The source type is not
5602 // defined when the initializer is a braced-init-list or when it is a
5603 // parenthesized list of expressions.
5604 QualType DestType = Entity.getType();
5605
5606 if (DestType->isDependentType() ||
3
Assuming the condition is false
5
Taking false branch
5607 Expr::hasAnyTypeDependentArguments(Args)) {
4
Assuming the condition is false
5608 SequenceKind = DependentSequence;
5609 return;
5610 }
5611
5612 // Almost everything is a normal sequence.
5613 setSequenceKind(NormalSequence);
5614
5615 QualType SourceType;
5616 Expr *Initializer = nullptr;
6
'Initializer' initialized to a null pointer value
5617 if (Args.size() == 1) {
7
Assuming the condition is false
8
Taking false branch
5618 Initializer = Args[0];
5619 if (S.getLangOpts().ObjC) {
5620 if (S.CheckObjCBridgeRelatedConversions(Initializer->getBeginLoc(),
5621 DestType, Initializer->getType(),
5622 Initializer) ||
5623 S.ConversionToObjCStringLiteralCheck(DestType, Initializer))
5624 Args[0] = Initializer;
5625 }
5626 if (!isa<InitListExpr>(Initializer))
5627 SourceType = Initializer->getType();
5628 }
5629
5630 // - If the initializer is a (non-parenthesized) braced-init-list, the
5631 // object is list-initialized (8.5.4).
5632 if (Kind.getKind() != InitializationKind::IK_Direct) {
9
Assuming the condition is false
10
Taking false branch
5633 if (InitListExpr *InitList = dyn_cast_or_null<InitListExpr>(Initializer)) {
5634 TryListInitialization(S, Entity, Kind, InitList, *this,
5635 TreatUnavailableAsInvalid);
5636 return;
5637 }
5638 }
5639
5640 // - If the destination type is a reference type, see 8.5.3.
5641 if (DestType->isReferenceType()) {
11
Calling 'Type::isReferenceType'
14
Returning from 'Type::isReferenceType'
15
Taking false branch
5642 // C++0x [dcl.init.ref]p1:
5643 // A variable declared to be a T& or T&&, that is, "reference to type T"
5644 // (8.3.2), shall be initialized by an object, or function, of type T or
5645 // by an object that can be converted into a T.
5646 // (Therefore, multiple arguments are not permitted.)
5647 if (Args.size() != 1)
5648 SetFailed(FK_TooManyInitsForReference);
5649 // C++17 [dcl.init.ref]p5:
5650 // A reference [...] is initialized by an expression [...] as follows:
5651 // If the initializer is not an expression, presumably we should reject,
5652 // but the standard fails to actually say so.
5653 else if (isa<InitListExpr>(Args[0]))
5654 SetFailed(FK_ParenthesizedListInitForReference);
5655 else
5656 TryReferenceInitialization(S, Entity, Kind, Args[0], *this);
5657 return;
5658 }
5659
5660 // - If the initializer is (), the object is value-initialized.
5661 if (Kind.getKind() == InitializationKind::IK_Value ||
17
Taking false branch
5662 (Kind.getKind() == InitializationKind::IK_Direct && Args.empty())) {
16
Assuming the condition is false
5663 TryValueInitialization(S, Entity, Kind, *this);
5664 return;
5665 }
5666
5667 // Handle default initialization.
5668 if (Kind.getKind() == InitializationKind::IK_Default) {
18
Taking false branch
5669 TryDefaultInitialization(S, Entity, Kind, *this);
5670 return;
5671 }
5672
5673 // - If the destination type is an array of characters, an array of
5674 // char16_t, an array of char32_t, or an array of wchar_t, and the
5675 // initializer is a string literal, see 8.5.2.
5676 // - Otherwise, if the destination type is an array, the program is
5677 // ill-formed.
5678 if (const ArrayType *DestAT = Context.getAsArrayType(DestType)) {
19
Assuming 'DestAT' is null
20
Taking false branch
5679 if (Initializer && isa<VariableArrayType>(DestAT)) {
5680 SetFailed(FK_VariableLengthArrayHasInitializer);
5681 return;
5682 }
5683
5684 if (Initializer) {
5685 switch (IsStringInit(Initializer, DestAT, Context)) {
5686 case SIF_None:
5687 TryStringLiteralInitialization(S, Entity, Kind, Initializer, *this);
5688 return;
5689 case SIF_NarrowStringIntoWideChar:
5690 SetFailed(FK_NarrowStringIntoWideCharArray);
5691 return;
5692 case SIF_WideStringIntoChar:
5693 SetFailed(FK_WideStringIntoCharArray);
5694 return;
5695 case SIF_IncompatWideStringIntoWideChar:
5696 SetFailed(FK_IncompatWideStringIntoWideChar);
5697 return;
5698 case SIF_PlainStringIntoUTF8Char:
5699 SetFailed(FK_PlainStringIntoUTF8Char);
5700 return;
5701 case SIF_UTF8StringIntoPlainChar:
5702 SetFailed(FK_UTF8StringIntoPlainChar);
5703 return;
5704 case SIF_Other:
5705 break;
5706 }
5707 }
5708
5709 // Some kinds of initialization permit an array to be initialized from
5710 // another array of the same type, and perform elementwise initialization.
5711 if (Initializer && isa<ConstantArrayType>(DestAT) &&
5712 S.Context.hasSameUnqualifiedType(Initializer->getType(),
5713 Entity.getType()) &&
5714 canPerformArrayCopy(Entity)) {
5715 // If source is a prvalue, use it directly.
5716 if (Initializer->getValueKind() == VK_RValue) {
5717 AddArrayInitStep(DestType, /*IsGNUExtension*/false);
5718 return;
5719 }
5720
5721 // Emit element-at-a-time copy loop.
5722 InitializedEntity Element =
5723 InitializedEntity::InitializeElement(S.Context, 0, Entity);
5724 QualType InitEltT =
5725 Context.getAsArrayType(Initializer->getType())->getElementType();
5726 OpaqueValueExpr OVE(Initializer->getExprLoc(), InitEltT,
5727 Initializer->getValueKind(),
5728 Initializer->getObjectKind());
5729 Expr *OVEAsExpr = &OVE;
5730 InitializeFrom(S, Element, Kind, OVEAsExpr, TopLevelOfInitList,
5731 TreatUnavailableAsInvalid);
5732 if (!Failed())
5733 AddArrayInitLoopStep(Entity.getType(), InitEltT);
5734 return;
5735 }
5736
5737 // Note: as an GNU C extension, we allow initialization of an
5738 // array from a compound literal that creates an array of the same
5739 // type, so long as the initializer has no side effects.
5740 if (!S.getLangOpts().CPlusPlus && Initializer &&
5741 isa<CompoundLiteralExpr>(Initializer->IgnoreParens()) &&
5742 Initializer->getType()->isArrayType()) {
5743 const ArrayType *SourceAT
5744 = Context.getAsArrayType(Initializer->getType());
5745 if (!hasCompatibleArrayTypes(S.Context, DestAT, SourceAT))
5746 SetFailed(FK_ArrayTypeMismatch);
5747 else if (Initializer->HasSideEffects(S.Context))
5748 SetFailed(FK_NonConstantArrayInit);
5749 else {
5750 AddArrayInitStep(DestType, /*IsGNUExtension*/true);
5751 }
5752 }
5753 // Note: as a GNU C++ extension, we allow list-initialization of a
5754 // class member of array type from a parenthesized initializer list.
5755 else if (S.getLangOpts().CPlusPlus &&
5756 Entity.getKind() == InitializedEntity::EK_Member &&
5757 Initializer && isa<InitListExpr>(Initializer)) {
5758 TryListInitialization(S, Entity, Kind, cast<InitListExpr>(Initializer),
5759 *this, TreatUnavailableAsInvalid);
5760 AddParenthesizedArrayInitStep(DestType);
5761 } else if (DestAT->getElementType()->isCharType())
5762 SetFailed(FK_ArrayNeedsInitListOrStringLiteral);
5763 else if (IsWideCharCompatible(DestAT->getElementType(), Context))
5764 SetFailed(FK_ArrayNeedsInitListOrWideStringLiteral);
5765 else
5766 SetFailed(FK_ArrayNeedsInitList);
5767
5768 return;
5769 }
5770
5771 // Determine whether we should consider writeback conversions for
5772 // Objective-C ARC.
5773 bool allowObjCWritebackConversion = S.getLangOpts().ObjCAutoRefCount &&
21
Assuming field 'ObjCAutoRefCount' is 0
5774 Entity.isParameterKind();
5775
5776 if (TryOCLSamplerInitialization(S, *this, DestType, Initializer))
22
Calling 'TryOCLSamplerInitialization'
26
Returning from 'TryOCLSamplerInitialization'
27
Taking false branch
5777 return;
5778
5779 // We're at the end of the line for C: it's either a write-back conversion
5780 // or it's a C assignment. There's no need to check anything else.
5781 if (!S.getLangOpts().CPlusPlus) {
28
Assuming field 'CPlusPlus' is not equal to 0
29
Taking false branch
5782 // If allowed, check whether this is an Objective-C writeback conversion.
5783 if (allowObjCWritebackConversion &&
5784 tryObjCWritebackConversion(S, *this, Entity, Initializer)) {
5785 return;
5786 }
5787
5788 if (TryOCLZeroOpaqueTypeInitialization(S, *this, DestType, Initializer))
5789 return;
5790
5791 // Handle initialization in C
5792 AddCAssignmentStep(DestType);
5793 MaybeProduceObjCObject(S, *this, Entity);
5794 return;
5795 }
5796
5797 assert
29.1
Field 'CPlusPlus' is not equal to 0
29.1
Field 'CPlusPlus' is not equal to 0
29.1
Field 'CPlusPlus' is not equal to 0
29.1
Field 'CPlusPlus' is not equal to 0
29.1
Field 'CPlusPlus' is not equal to 0
(S.getLangOpts().CPlusPlus)((S.getLangOpts().CPlusPlus) ? static_cast<void> (0) : __assert_fail
("S.getLangOpts().CPlusPlus", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 5797, __PRETTY_FUNCTION__))
;
30
'?' condition is true
5798
5799 // - If the destination type is a (possibly cv-qualified) class type:
5800 if (DestType->isRecordType()) {
31
Calling 'Type::isRecordType'
34
Returning from 'Type::isRecordType'
35
Taking false branch
5801 // - If the initialization is direct-initialization, or if it is
5802 // copy-initialization where the cv-unqualified version of the
5803 // source type is the same class as, or a derived class of, the
5804 // class of the destination, constructors are considered. [...]
5805 if (Kind.getKind() == InitializationKind::IK_Direct ||
5806 (Kind.getKind() == InitializationKind::IK_Copy &&
5807 (Context.hasSameUnqualifiedType(SourceType, DestType) ||
5808 S.IsDerivedFrom(Initializer->getBeginLoc(), SourceType, DestType))))
5809 TryConstructorInitialization(S, Entity, Kind, Args,
5810 DestType, DestType, *this);
5811 // - Otherwise (i.e., for the remaining copy-initialization cases),
5812 // user-defined conversion sequences that can convert from the source
5813 // type to the destination type or (when a conversion function is
5814 // used) to a derived class thereof are enumerated as described in
5815 // 13.3.1.4, and the best one is chosen through overload resolution
5816 // (13.3).
5817 else
5818 TryUserDefinedConversion(S, DestType, Kind, Initializer, *this,
5819 TopLevelOfInitList);
5820 return;
5821 }
5822
5823 assert(Args.size() >= 1 && "Zero-argument case handled above")((Args.size() >= 1 && "Zero-argument case handled above"
) ? static_cast<void> (0) : __assert_fail ("Args.size() >= 1 && \"Zero-argument case handled above\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 5823, __PRETTY_FUNCTION__))
;
36
Assuming the condition is true
37
'?' condition is true
5824
5825 // The remaining cases all need a source type.
5826 if (Args.size() > 1) {
38
Assuming the condition is false
39
Taking false branch
5827 SetFailed(FK_TooManyInitsForScalar);
5828 return;
5829 } else if (isa<InitListExpr>(Args[0])) {
40
Assuming the object is not a 'InitListExpr'
41
Taking false branch
5830 SetFailed(FK_ParenthesizedListInitForScalar);
5831 return;
5832 }
5833
5834 // - Otherwise, if the source type is a (possibly cv-qualified) class
5835 // type, conversion functions are considered.
5836 if (!SourceType.isNull() && SourceType->isRecordType()) {
42
Calling 'QualType::isNull'
56
Returning from 'QualType::isNull'
5837 // For a conversion to _Atomic(T) from either T or a class type derived
5838 // from T, initialize the T object then convert to _Atomic type.
5839 bool NeedAtomicConversion = false;
5840 if (const AtomicType *Atomic = DestType->getAs<AtomicType>()) {
5841 if (Context.hasSameUnqualifiedType(SourceType, Atomic->getValueType()) ||
5842 S.IsDerivedFrom(Initializer->getBeginLoc(), SourceType,
5843 Atomic->getValueType())) {
5844 DestType = Atomic->getValueType();
5845 NeedAtomicConversion = true;
5846 }
5847 }
5848
5849 TryUserDefinedConversion(S, DestType, Kind, Initializer, *this,
5850 TopLevelOfInitList);
5851 MaybeProduceObjCObject(S, *this, Entity);
5852 if (!Failed() && NeedAtomicConversion)
5853 AddAtomicConversionStep(Entity.getType());
5854 return;
5855 }
5856
5857 // - Otherwise, the initial value of the object being initialized is the
5858 // (possibly converted) value of the initializer expression. Standard
5859 // conversions (Clause 4) will be used, if necessary, to convert the
5860 // initializer expression to the cv-unqualified version of the
5861 // destination type; no user-defined conversions are considered.
5862
5863 ImplicitConversionSequence ICS
5864 = S.TryImplicitConversion(Initializer, DestType,
5865 /*SuppressUserConversions*/true,
5866 /*AllowExplicitConversions*/ false,
5867 /*InOverloadResolution*/ false,
5868 /*CStyle=*/Kind.isCStyleOrFunctionalCast(),
5869 allowObjCWritebackConversion);
5870
5871 if (ICS.isStandard() &&
57
Calling 'ImplicitConversionSequence::isStandard'
60
Returning from 'ImplicitConversionSequence::isStandard'
5872 ICS.Standard.Second == ICK_Writeback_Conversion) {
5873 // Objective-C ARC writeback conversion.
5874
5875 // We should copy unless we're passing to an argument explicitly
5876 // marked 'out'.
5877 bool ShouldCopy = true;
5878 if (ParmVarDecl *Param = cast_or_null<ParmVarDecl>(Entity.getDecl()))
5879 ShouldCopy = (Param->getObjCDeclQualifier() != ParmVarDecl::OBJC_TQ_Out);
5880
5881 // If there was an lvalue adjustment, add it as a separate conversion.
5882 if (ICS.Standard.First == ICK_Array_To_Pointer ||
5883 ICS.Standard.First == ICK_Lvalue_To_Rvalue) {
5884 ImplicitConversionSequence LvalueICS;
5885 LvalueICS.setStandard();
5886 LvalueICS.Standard.setAsIdentityConversion();
5887 LvalueICS.Standard.setAllToTypes(ICS.Standard.getToType(0));
5888 LvalueICS.Standard.First = ICS.Standard.First;
5889 AddConversionSequenceStep(LvalueICS, ICS.Standard.getToType(0));
5890 }
5891
5892 AddPassByIndirectCopyRestoreStep(DestType, ShouldCopy);
5893 } else if (ICS.isBad()) {
61
Calling 'ImplicitConversionSequence::isBad'
64
Returning from 'ImplicitConversionSequence::isBad'
65
Taking true branch
5894 DeclAccessPair dap;
5895 if (isLibstdcxxPointerReturnFalseHack(S, Entity, Initializer)) {
66
Calling 'isLibstdcxxPointerReturnFalseHack'
69
Returning from 'isLibstdcxxPointerReturnFalseHack'
70
Taking false branch
5896 AddZeroInitializationStep(Entity.getType());
5897 } else if (Initializer->getType() == Context.OverloadTy &&
71
Called C++ object pointer is null
5898 !S.ResolveAddressOfOverloadedFunction(Initializer, DestType,
5899 false, dap))
5900 SetFailed(InitializationSequence::FK_AddressOfOverloadFailed);
5901 else if (Initializer->getType()->isFunctionType() &&
5902 isExprAnUnaddressableFunction(S, Initializer))
5903 SetFailed(InitializationSequence::FK_AddressOfUnaddressableFunction);
5904 else
5905 SetFailed(InitializationSequence::FK_ConversionFailed);
5906 } else {
5907 AddConversionSequenceStep(ICS, DestType, TopLevelOfInitList);
5908
5909 MaybeProduceObjCObject(S, *this, Entity);
5910 }
5911}
5912
5913InitializationSequence::~InitializationSequence() {
5914 for (auto &S : Steps)
5915 S.Destroy();
5916}
5917
5918//===----------------------------------------------------------------------===//
5919// Perform initialization
5920//===----------------------------------------------------------------------===//
5921static Sema::AssignmentAction
5922getAssignmentAction(const InitializedEntity &Entity, bool Diagnose = false) {
5923 switch(Entity.getKind()) {
5924 case InitializedEntity::EK_Variable:
5925 case InitializedEntity::EK_New:
5926 case InitializedEntity::EK_Exception:
5927 case InitializedEntity::EK_Base:
5928 case InitializedEntity::EK_Delegating:
5929 return Sema::AA_Initializing;
5930
5931 case InitializedEntity::EK_Parameter:
5932 if (Entity.getDecl() &&
5933 isa<ObjCMethodDecl>(Entity.getDecl()->getDeclContext()))
5934 return Sema::AA_Sending;
5935
5936 return Sema::AA_Passing;
5937
5938 case InitializedEntity::EK_Parameter_CF_Audited:
5939 if (Entity.getDecl() &&
5940 isa<ObjCMethodDecl>(Entity.getDecl()->getDeclContext()))
5941 return Sema::AA_Sending;
5942
5943 return !Diagnose ? Sema::AA_Passing : Sema::AA_Passing_CFAudited;
5944
5945 case InitializedEntity::EK_Result:
5946 case InitializedEntity::EK_StmtExprResult: // FIXME: Not quite right.
5947 return Sema::AA_Returning;
5948
5949 case InitializedEntity::EK_Temporary:
5950 case InitializedEntity::EK_RelatedResult:
5951 // FIXME: Can we tell apart casting vs. converting?
5952 return Sema::AA_Casting;
5953
5954 case InitializedEntity::EK_Member:
5955 case InitializedEntity::EK_Binding:
5956 case InitializedEntity::EK_ArrayElement:
5957 case InitializedEntity::EK_VectorElement:
5958 case InitializedEntity::EK_ComplexElement:
5959 case InitializedEntity::EK_BlockElement:
5960 case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
5961 case InitializedEntity::EK_LambdaCapture:
5962 case InitializedEntity::EK_CompoundLiteralInit:
5963 return Sema::AA_Initializing;
5964 }
5965
5966 llvm_unreachable("Invalid EntityKind!")::llvm::llvm_unreachable_internal("Invalid EntityKind!", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 5966)
;
5967}
5968
5969/// Whether we should bind a created object as a temporary when
5970/// initializing the given entity.
5971static bool shouldBindAsTemporary(const InitializedEntity &Entity) {
5972 switch (Entity.getKind()) {
5973 case InitializedEntity::EK_ArrayElement:
5974 case InitializedEntity::EK_Member:
5975 case InitializedEntity::EK_Result:
5976 case InitializedEntity::EK_StmtExprResult:
5977 case InitializedEntity::EK_New:
5978 case InitializedEntity::EK_Variable:
5979 case InitializedEntity::EK_Base:
5980 case InitializedEntity::EK_Delegating:
5981 case InitializedEntity::EK_VectorElement:
5982 case InitializedEntity::EK_ComplexElement:
5983 case InitializedEntity::EK_Exception:
5984 case InitializedEntity::EK_BlockElement:
5985 case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
5986 case InitializedEntity::EK_LambdaCapture:
5987 case InitializedEntity::EK_CompoundLiteralInit:
5988 return false;
5989
5990 case InitializedEntity::EK_Parameter:
5991 case InitializedEntity::EK_Parameter_CF_Audited:
5992 case InitializedEntity::EK_Temporary:
5993 case InitializedEntity::EK_RelatedResult:
5994 case InitializedEntity::EK_Binding:
5995 return true;
5996 }
5997
5998 llvm_unreachable("missed an InitializedEntity kind?")::llvm::llvm_unreachable_internal("missed an InitializedEntity kind?"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 5998)
;
5999}
6000
6001/// Whether the given entity, when initialized with an object
6002/// created for that initialization, requires destruction.
6003static bool shouldDestroyEntity(const InitializedEntity &Entity) {
6004 switch (Entity.getKind()) {
6005 case InitializedEntity::EK_Result:
6006 case InitializedEntity::EK_StmtExprResult:
6007 case InitializedEntity::EK_New:
6008 case InitializedEntity::EK_Base:
6009 case InitializedEntity::EK_Delegating:
6010 case InitializedEntity::EK_VectorElement:
6011 case InitializedEntity::EK_ComplexElement:
6012 case InitializedEntity::EK_BlockElement:
6013 case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
6014 case InitializedEntity::EK_LambdaCapture:
6015 return false;
6016
6017 case InitializedEntity::EK_Member:
6018 case InitializedEntity::EK_Binding:
6019 case InitializedEntity::EK_Variable:
6020 case InitializedEntity::EK_Parameter:
6021 case InitializedEntity::EK_Parameter_CF_Audited:
6022 case InitializedEntity::EK_Temporary:
6023 case InitializedEntity::EK_ArrayElement:
6024 case InitializedEntity::EK_Exception:
6025 case InitializedEntity::EK_CompoundLiteralInit:
6026 case InitializedEntity::EK_RelatedResult:
6027 return true;
6028 }
6029
6030 llvm_unreachable("missed an InitializedEntity kind?")::llvm::llvm_unreachable_internal("missed an InitializedEntity kind?"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 6030)
;
6031}
6032
6033/// Get the location at which initialization diagnostics should appear.
6034static SourceLocation getInitializationLoc(const InitializedEntity &Entity,
6035 Expr *Initializer) {
6036 switch (Entity.getKind()) {
6037 case InitializedEntity::EK_Result:
6038 case InitializedEntity::EK_StmtExprResult:
6039 return Entity.getReturnLoc();
6040
6041 case InitializedEntity::EK_Exception:
6042 return Entity.getThrowLoc();
6043
6044 case InitializedEntity::EK_Variable:
6045 case InitializedEntity::EK_Binding:
6046 return Entity.getDecl()->getLocation();
6047
6048 case InitializedEntity::EK_LambdaCapture:
6049 return Entity.getCaptureLoc();
6050
6051 case InitializedEntity::EK_ArrayElement:
6052 case InitializedEntity::EK_Member:
6053 case InitializedEntity::EK_Parameter:
6054 case InitializedEntity::EK_Parameter_CF_Audited:
6055 case InitializedEntity::EK_Temporary:
6056 case InitializedEntity::EK_New:
6057 case InitializedEntity::EK_Base:
6058 case InitializedEntity::EK_Delegating:
6059 case InitializedEntity::EK_VectorElement:
6060 case InitializedEntity::EK_ComplexElement:
6061 case InitializedEntity::EK_BlockElement:
6062 case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
6063 case InitializedEntity::EK_CompoundLiteralInit:
6064 case InitializedEntity::EK_RelatedResult:
6065 return Initializer->getBeginLoc();
6066 }
6067 llvm_unreachable("missed an InitializedEntity kind?")::llvm::llvm_unreachable_internal("missed an InitializedEntity kind?"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 6067)
;
6068}
6069
6070/// Make a (potentially elidable) temporary copy of the object
6071/// provided by the given initializer by calling the appropriate copy
6072/// constructor.
6073///
6074/// \param S The Sema object used for type-checking.
6075///
6076/// \param T The type of the temporary object, which must either be
6077/// the type of the initializer expression or a superclass thereof.
6078///
6079/// \param Entity The entity being initialized.
6080///
6081/// \param CurInit The initializer expression.
6082///
6083/// \param IsExtraneousCopy Whether this is an "extraneous" copy that
6084/// is permitted in C++03 (but not C++0x) when binding a reference to
6085/// an rvalue.
6086///
6087/// \returns An expression that copies the initializer expression into
6088/// a temporary object, or an error expression if a copy could not be
6089/// created.
6090static ExprResult CopyObject(Sema &S,
6091 QualType T,
6092 const InitializedEntity &Entity,
6093 ExprResult CurInit,
6094 bool IsExtraneousCopy) {
6095 if (CurInit.isInvalid())
6096 return CurInit;
6097 // Determine which class type we're copying to.
6098 Expr *CurInitExpr = (Expr *)CurInit.get();
6099 CXXRecordDecl *Class = nullptr;
6100 if (const RecordType *Record = T->getAs<RecordType>())
6101 Class = cast<CXXRecordDecl>(Record->getDecl());
6102 if (!Class)
6103 return CurInit;
6104
6105 SourceLocation Loc = getInitializationLoc(Entity, CurInit.get());
6106
6107 // Make sure that the type we are copying is complete.
6108 if (S.RequireCompleteType(Loc, T, diag::err_temp_copy_incomplete))
6109 return CurInit;
6110
6111 // Perform overload resolution using the class's constructors. Per
6112 // C++11 [dcl.init]p16, second bullet for class types, this initialization
6113 // is direct-initialization.
6114 OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Normal);
6115 DeclContext::lookup_result Ctors = S.LookupConstructors(Class);
6116
6117 OverloadCandidateSet::iterator Best;
6118 switch (ResolveConstructorOverload(
6119 S, Loc, CurInitExpr, CandidateSet, T, Ctors, Best,
6120 /*CopyInitializing=*/false, /*AllowExplicit=*/true,
6121 /*OnlyListConstructors=*/false, /*IsListInit=*/false,
6122 /*SecondStepOfCopyInit=*/true)) {
6123 case OR_Success:
6124 break;
6125
6126 case OR_No_Viable_Function:
6127 CandidateSet.NoteCandidates(
6128 PartialDiagnosticAt(
6129 Loc, S.PDiag(IsExtraneousCopy && !S.isSFINAEContext()
6130 ? diag::ext_rvalue_to_reference_temp_copy_no_viable
6131 : diag::err_temp_copy_no_viable)
6132 << (int)Entity.getKind() << CurInitExpr->getType()
6133 << CurInitExpr->getSourceRange()),
6134 S, OCD_AllCandidates, CurInitExpr);
6135 if (!IsExtraneousCopy || S.isSFINAEContext())
6136 return ExprError();
6137 return CurInit;
6138
6139 case OR_Ambiguous:
6140 CandidateSet.NoteCandidates(
6141 PartialDiagnosticAt(Loc, S.PDiag(diag::err_temp_copy_ambiguous)
6142 << (int)Entity.getKind()
6143 << CurInitExpr->getType()
6144 << CurInitExpr->getSourceRange()),
6145 S, OCD_AmbiguousCandidates, CurInitExpr);
6146 return ExprError();
6147
6148 case OR_Deleted:
6149 S.Diag(Loc, diag::err_temp_copy_deleted)
6150 << (int)Entity.getKind() << CurInitExpr->getType()
6151 << CurInitExpr->getSourceRange();
6152 S.NoteDeletedFunction(Best->Function);
6153 return ExprError();
6154 }
6155
6156 bool HadMultipleCandidates = CandidateSet.size() > 1;
6157
6158 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function);
6159 SmallVector<Expr*, 8> ConstructorArgs;
6160 CurInit.get(); // Ownership transferred into MultiExprArg, below.
6161
6162 S.CheckConstructorAccess(Loc, Constructor, Best->FoundDecl, Entity,
6163 IsExtraneousCopy);
6164
6165 if (IsExtraneousCopy) {
6166 // If this is a totally extraneous copy for C++03 reference
6167 // binding purposes, just return the original initialization
6168 // expression. We don't generate an (elided) copy operation here
6169 // because doing so would require us to pass down a flag to avoid
6170 // infinite recursion, where each step adds another extraneous,
6171 // elidable copy.
6172
6173 // Instantiate the default arguments of any extra parameters in
6174 // the selected copy constructor, as if we were going to create a
6175 // proper call to the copy constructor.
6176 for (unsigned I = 1, N = Constructor->getNumParams(); I != N; ++I) {
6177 ParmVarDecl *Parm = Constructor->getParamDecl(I);
6178 if (S.RequireCompleteType(Loc, Parm->getType(),
6179 diag::err_call_incomplete_argument))
6180 break;
6181
6182 // Build the default argument expression; we don't actually care
6183 // if this succeeds or not, because this routine will complain
6184 // if there was a problem.
6185 S.BuildCXXDefaultArgExpr(Loc, Constructor, Parm);
6186 }
6187
6188 return CurInitExpr;
6189 }
6190
6191 // Determine the arguments required to actually perform the
6192 // constructor call (we might have derived-to-base conversions, or
6193 // the copy constructor may have default arguments).
6194 if (S.CompleteConstructorCall(Constructor, CurInitExpr, Loc, ConstructorArgs))
6195 return ExprError();
6196
6197 // C++0x [class.copy]p32:
6198 // When certain criteria are met, an implementation is allowed to
6199 // omit the copy/move construction of a class object, even if the
6200 // copy/move constructor and/or destructor for the object have
6201 // side effects. [...]
6202 // - when a temporary class object that has not been bound to a
6203 // reference (12.2) would be copied/moved to a class object
6204 // with the same cv-unqualified type, the copy/move operation
6205 // can be omitted by constructing the temporary object
6206 // directly into the target of the omitted copy/move
6207 //
6208 // Note that the other three bullets are handled elsewhere. Copy
6209 // elision for return statements and throw expressions are handled as part
6210 // of constructor initialization, while copy elision for exception handlers
6211 // is handled by the run-time.
6212 //
6213 // FIXME: If the function parameter is not the same type as the temporary, we
6214 // should still be able to elide the copy, but we don't have a way to
6215 // represent in the AST how much should be elided in this case.
6216 bool Elidable =
6217 CurInitExpr->isTemporaryObject(S.Context, Class) &&
6218 S.Context.hasSameUnqualifiedType(
6219 Best->Function->getParamDecl(0)->getType().getNonReferenceType(),
6220 CurInitExpr->getType());
6221
6222 // Actually perform the constructor call.
6223 CurInit = S.BuildCXXConstructExpr(Loc, T, Best->FoundDecl, Constructor,
6224 Elidable,
6225 ConstructorArgs,
6226 HadMultipleCandidates,
6227 /*ListInit*/ false,
6228 /*StdInitListInit*/ false,
6229 /*ZeroInit*/ false,
6230 CXXConstructExpr::CK_Complete,
6231 SourceRange());
6232
6233 // If we're supposed to bind temporaries, do so.
6234 if (!CurInit.isInvalid() && shouldBindAsTemporary(Entity))
6235 CurInit = S.MaybeBindToTemporary(CurInit.getAs<Expr>());
6236 return CurInit;
6237}
6238
6239/// Check whether elidable copy construction for binding a reference to
6240/// a temporary would have succeeded if we were building in C++98 mode, for
6241/// -Wc++98-compat.
6242static void CheckCXX98CompatAccessibleCopy(Sema &S,
6243 const InitializedEntity &Entity,
6244 Expr *CurInitExpr) {
6245 assert(S.getLangOpts().CPlusPlus11)((S.getLangOpts().CPlusPlus11) ? static_cast<void> (0) :
__assert_fail ("S.getLangOpts().CPlusPlus11", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 6245, __PRETTY_FUNCTION__))
;
6246
6247 const RecordType *Record = CurInitExpr->getType()->getAs<RecordType>();
6248 if (!Record)
6249 return;
6250
6251 SourceLocation Loc = getInitializationLoc(Entity, CurInitExpr);
6252 if (S.Diags.isIgnored(diag::warn_cxx98_compat_temp_copy, Loc))
6253 return;
6254
6255 // Find constructors which would have been considered.
6256 OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Normal);
6257 DeclContext::lookup_result Ctors =
6258 S.LookupConstructors(cast<CXXRecordDecl>(Record->getDecl()));
6259
6260 // Perform overload resolution.
6261 OverloadCandidateSet::iterator Best;
6262 OverloadingResult OR = ResolveConstructorOverload(
6263 S, Loc, CurInitExpr, CandidateSet, CurInitExpr->getType(), Ctors, Best,
6264 /*CopyInitializing=*/false, /*AllowExplicit=*/true,
6265 /*OnlyListConstructors=*/false, /*IsListInit=*/false,
6266 /*SecondStepOfCopyInit=*/true);
6267
6268 PartialDiagnostic Diag = S.PDiag(diag::warn_cxx98_compat_temp_copy)
6269 << OR << (int)Entity.getKind() << CurInitExpr->getType()
6270 << CurInitExpr->getSourceRange();
6271
6272 switch (OR) {
6273 case OR_Success:
6274 S.CheckConstructorAccess(Loc, cast<CXXConstructorDecl>(Best->Function),
6275 Best->FoundDecl, Entity, Diag);
6276 // FIXME: Check default arguments as far as that's possible.
6277 break;
6278
6279 case OR_No_Viable_Function:
6280 CandidateSet.NoteCandidates(PartialDiagnosticAt(Loc, Diag), S,
6281 OCD_AllCandidates, CurInitExpr);
6282 break;
6283
6284 case OR_Ambiguous:
6285 CandidateSet.NoteCandidates(PartialDiagnosticAt(Loc, Diag), S,
6286 OCD_AmbiguousCandidates, CurInitExpr);
6287 break;
6288
6289 case OR_Deleted:
6290 S.Diag(Loc, Diag);
6291 S.NoteDeletedFunction(Best->Function);
6292 break;
6293 }
6294}
6295
6296void InitializationSequence::PrintInitLocationNote(Sema &S,
6297 const InitializedEntity &Entity) {
6298 if (Entity.isParameterKind() && Entity.getDecl()) {
6299 if (Entity.getDecl()->getLocation().isInvalid())
6300 return;
6301
6302 if (Entity.getDecl()->getDeclName())
6303 S.Diag(Entity.getDecl()->getLocation(), diag::note_parameter_named_here)
6304 << Entity.getDecl()->getDeclName();
6305 else
6306 S.Diag(Entity.getDecl()->getLocation(), diag::note_parameter_here);
6307 }
6308 else if (Entity.getKind() == InitializedEntity::EK_RelatedResult &&
6309 Entity.getMethodDecl())
6310 S.Diag(Entity.getMethodDecl()->getLocation(),
6311 diag::note_method_return_type_change)
6312 << Entity.getMethodDecl()->getDeclName();
6313}
6314
6315/// Returns true if the parameters describe a constructor initialization of
6316/// an explicit temporary object, e.g. "Point(x, y)".
6317static bool isExplicitTemporary(const InitializedEntity &Entity,
6318 const InitializationKind &Kind,
6319 unsigned NumArgs) {
6320 switch (Entity.getKind()) {
6321 case InitializedEntity::EK_Temporary:
6322 case InitializedEntity::EK_CompoundLiteralInit:
6323 case InitializedEntity::EK_RelatedResult:
6324 break;
6325 default:
6326 return false;
6327 }
6328
6329 switch (Kind.getKind()) {
6330 case InitializationKind::IK_DirectList:
6331 return true;
6332 // FIXME: Hack to work around cast weirdness.
6333 case InitializationKind::IK_Direct:
6334 case InitializationKind::IK_Value:
6335 return NumArgs != 1;
6336 default:
6337 return false;
6338 }
6339}
6340
6341static ExprResult
6342PerformConstructorInitialization(Sema &S,
6343 const InitializedEntity &Entity,
6344 const InitializationKind &Kind,
6345 MultiExprArg Args,
6346 const InitializationSequence::Step& Step,
6347 bool &ConstructorInitRequiresZeroInit,
6348 bool IsListInitialization,
6349 bool IsStdInitListInitialization,
6350 SourceLocation LBraceLoc,
6351 SourceLocation RBraceLoc) {
6352 unsigned NumArgs = Args.size();
6353 CXXConstructorDecl *Constructor
6354 = cast<CXXConstructorDecl>(Step.Function.Function);
6355 bool HadMultipleCandidates = Step.Function.HadMultipleCandidates;
6356
6357 // Build a call to the selected constructor.
6358 SmallVector<Expr*, 8> ConstructorArgs;
6359 SourceLocation Loc = (Kind.isCopyInit() && Kind.getEqualLoc().isValid())
6360 ? Kind.getEqualLoc()
6361 : Kind.getLocation();
6362
6363 if (Kind.getKind() == InitializationKind::IK_Default) {
6364 // Force even a trivial, implicit default constructor to be
6365 // semantically checked. We do this explicitly because we don't build
6366 // the definition for completely trivial constructors.
6367 assert(Constructor->getParent() && "No parent class for constructor.")((Constructor->getParent() && "No parent class for constructor."
) ? static_cast<void> (0) : __assert_fail ("Constructor->getParent() && \"No parent class for constructor.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 6367, __PRETTY_FUNCTION__))
;
6368 if (Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&
6369 Constructor->isTrivial() && !Constructor->isUsed(false)) {
6370 S.runWithSufficientStackSpace(Loc, [&] {
6371 S.DefineImplicitDefaultConstructor(Loc, Constructor);
6372 });
6373 }
6374 }
6375
6376 ExprResult CurInit((Expr *)nullptr);
6377
6378 // C++ [over.match.copy]p1:
6379 // - When initializing a temporary to be bound to the first parameter
6380 // of a constructor that takes a reference to possibly cv-qualified
6381 // T as its first argument, called with a single argument in the
6382 // context of direct-initialization, explicit conversion functions
6383 // are also considered.
6384 bool AllowExplicitConv =
6385 Kind.AllowExplicit() && !Kind.isCopyInit() && Args.size() == 1 &&
6386 hasCopyOrMoveCtorParam(S.Context,
6387 getConstructorInfo(Step.Function.FoundDecl));
6388
6389 // Determine the arguments required to actually perform the constructor
6390 // call.
6391 if (S.CompleteConstructorCall(Constructor, Args,
6392 Loc, ConstructorArgs,
6393 AllowExplicitConv,
6394 IsListInitialization))
6395 return ExprError();
6396
6397
6398 if (isExplicitTemporary(Entity, Kind, NumArgs)) {
6399 // An explicitly-constructed temporary, e.g., X(1, 2).
6400 if (S.DiagnoseUseOfDecl(Constructor, Loc))
6401 return ExprError();
6402
6403 TypeSourceInfo *TSInfo = Entity.getTypeSourceInfo();
6404 if (!TSInfo)
6405 TSInfo = S.Context.getTrivialTypeSourceInfo(Entity.getType(), Loc);
6406 SourceRange ParenOrBraceRange =
6407 (Kind.getKind() == InitializationKind::IK_DirectList)
6408 ? SourceRange(LBraceLoc, RBraceLoc)
6409 : Kind.getParenOrBraceRange();
6410
6411 if (auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(
6412 Step.Function.FoundDecl.getDecl())) {
6413 Constructor = S.findInheritingConstructor(Loc, Constructor, Shadow);
6414 if (S.DiagnoseUseOfDecl(Constructor, Loc))
6415 return ExprError();
6416 }
6417 S.MarkFunctionReferenced(Loc, Constructor);
6418
6419 CurInit = CXXTemporaryObjectExpr::Create(
6420 S.Context, Constructor,
6421 Entity.getType().getNonLValueExprType(S.Context), TSInfo,
6422 ConstructorArgs, ParenOrBraceRange, HadMultipleCandidates,
6423 IsListInitialization, IsStdInitListInitialization,
6424 ConstructorInitRequiresZeroInit);
6425 } else {
6426 CXXConstructExpr::ConstructionKind ConstructKind =
6427 CXXConstructExpr::CK_Complete;
6428
6429 if (Entity.getKind() == InitializedEntity::EK_Base) {
6430 ConstructKind = Entity.getBaseSpecifier()->isVirtual() ?
6431 CXXConstructExpr::CK_VirtualBase :
6432 CXXConstructExpr::CK_NonVirtualBase;
6433 } else if (Entity.getKind() == InitializedEntity::EK_Delegating) {
6434 ConstructKind = CXXConstructExpr::CK_Delegating;
6435 }
6436
6437 // Only get the parenthesis or brace range if it is a list initialization or
6438 // direct construction.
6439 SourceRange ParenOrBraceRange;
6440 if (IsListInitialization)
6441 ParenOrBraceRange = SourceRange(LBraceLoc, RBraceLoc);
6442 else if (Kind.getKind() == InitializationKind::IK_Direct)
6443 ParenOrBraceRange = Kind.getParenOrBraceRange();
6444
6445 // If the entity allows NRVO, mark the construction as elidable
6446 // unconditionally.
6447 if (Entity.allowsNRVO())
6448 CurInit = S.BuildCXXConstructExpr(Loc, Step.Type,
6449 Step.Function.FoundDecl,
6450 Constructor, /*Elidable=*/true,
6451 ConstructorArgs,
6452 HadMultipleCandidates,
6453 IsListInitialization,
6454 IsStdInitListInitialization,
6455 ConstructorInitRequiresZeroInit,
6456 ConstructKind,
6457 ParenOrBraceRange);
6458 else
6459 CurInit = S.BuildCXXConstructExpr(Loc, Step.Type,
6460 Step.Function.FoundDecl,
6461 Constructor,
6462 ConstructorArgs,
6463 HadMultipleCandidates,
6464 IsListInitialization,
6465 IsStdInitListInitialization,
6466 ConstructorInitRequiresZeroInit,
6467 ConstructKind,
6468 ParenOrBraceRange);
6469 }
6470 if (CurInit.isInvalid())
6471 return ExprError();
6472
6473 // Only check access if all of that succeeded.
6474 S.CheckConstructorAccess(Loc, Constructor, Step.Function.FoundDecl, Entity);
6475 if (S.DiagnoseUseOfDecl(Step.Function.FoundDecl, Loc))
6476 return ExprError();
6477
6478 if (const ArrayType *AT = S.Context.getAsArrayType(Entity.getType()))
6479 if (checkDestructorReference(S.Context.getBaseElementType(AT), Loc, S))
6480 return ExprError();
6481
6482 if (shouldBindAsTemporary(Entity))
6483 CurInit = S.MaybeBindToTemporary(CurInit.get());
6484
6485 return CurInit;
6486}
6487
6488namespace {
6489enum LifetimeKind {
6490 /// The lifetime of a temporary bound to this entity ends at the end of the
6491 /// full-expression, and that's (probably) fine.
6492 LK_FullExpression,
6493
6494 /// The lifetime of a temporary bound to this entity is extended to the
6495 /// lifeitme of the entity itself.
6496 LK_Extended,
6497
6498 /// The lifetime of a temporary bound to this entity probably ends too soon,
6499 /// because the entity is allocated in a new-expression.
6500 LK_New,
6501
6502 /// The lifetime of a temporary bound to this entity ends too soon, because
6503 /// the entity is a return object.
6504 LK_Return,
6505
6506 /// The lifetime of a temporary bound to this entity ends too soon, because
6507 /// the entity is the result of a statement expression.
6508 LK_StmtExprResult,
6509
6510 /// This is a mem-initializer: if it would extend a temporary (other than via
6511 /// a default member initializer), the program is ill-formed.
6512 LK_MemInitializer,
6513};
6514using LifetimeResult =
6515 llvm::PointerIntPair<const InitializedEntity *, 3, LifetimeKind>;
6516}
6517
6518/// Determine the declaration which an initialized entity ultimately refers to,
6519/// for the purpose of lifetime-extending a temporary bound to a reference in
6520/// the initialization of \p Entity.
6521static LifetimeResult getEntityLifetime(
6522 const InitializedEntity *Entity,
6523 const InitializedEntity *InitField = nullptr) {
6524 // C++11 [class.temporary]p5:
6525 switch (Entity->getKind()) {
6526 case InitializedEntity::EK_Variable:
6527 // The temporary [...] persists for the lifetime of the reference
6528 return {Entity, LK_Extended};
6529
6530 case InitializedEntity::EK_Member:
6531 // For subobjects, we look at the complete object.
6532 if (Entity->getParent())
6533 return getEntityLifetime(Entity->getParent(), Entity);
6534
6535 // except:
6536 // C++17 [class.base.init]p8:
6537 // A temporary expression bound to a reference member in a
6538 // mem-initializer is ill-formed.
6539 // C++17 [class.base.init]p11:
6540 // A temporary expression bound to a reference member from a
6541 // default member initializer is ill-formed.
6542 //
6543 // The context of p11 and its example suggest that it's only the use of a
6544 // default member initializer from a constructor that makes the program
6545 // ill-formed, not its mere existence, and that it can even be used by
6546 // aggregate initialization.
6547 return {Entity, Entity->isDefaultMemberInitializer() ? LK_Extended
6548 : LK_MemInitializer};
6549
6550 case InitializedEntity::EK_Binding:
6551 // Per [dcl.decomp]p3, the binding is treated as a variable of reference
6552 // type.
6553 return {Entity, LK_Extended};
6554
6555 case InitializedEntity::EK_Parameter:
6556 case InitializedEntity::EK_Parameter_CF_Audited:
6557 // -- A temporary bound to a reference parameter in a function call
6558 // persists until the completion of the full-expression containing
6559 // the call.
6560 return {nullptr, LK_FullExpression};
6561
6562 case InitializedEntity::EK_Result:
6563 // -- The lifetime of a temporary bound to the returned value in a
6564 // function return statement is not extended; the temporary is
6565 // destroyed at the end of the full-expression in the return statement.
6566 return {nullptr, LK_Return};
6567
6568 case InitializedEntity::EK_StmtExprResult:
6569 // FIXME: Should we lifetime-extend through the result of a statement
6570 // expression?
6571 return {nullptr, LK_StmtExprResult};
6572
6573 case InitializedEntity::EK_New:
6574 // -- A temporary bound to a reference in a new-initializer persists
6575 // until the completion of the full-expression containing the
6576 // new-initializer.
6577 return {nullptr, LK_New};
6578
6579 case InitializedEntity::EK_Temporary:
6580 case InitializedEntity::EK_CompoundLiteralInit:
6581 case InitializedEntity::EK_RelatedResult:
6582 // We don't yet know the storage duration of the surrounding temporary.
6583 // Assume it's got full-expression duration for now, it will patch up our
6584 // storage duration if that's not correct.
6585 return {nullptr, LK_FullExpression};
6586
6587 case InitializedEntity::EK_ArrayElement:
6588 // For subobjects, we look at the complete object.
6589 return getEntityLifetime(Entity->getParent(), InitField);
6590
6591 case InitializedEntity::EK_Base:
6592 // For subobjects, we look at the complete object.
6593 if (Entity->getParent())
6594 return getEntityLifetime(Entity->getParent(), InitField);
6595 return {InitField, LK_MemInitializer};
6596
6597 case InitializedEntity::EK_Delegating:
6598 // We can reach this case for aggregate initialization in a constructor:
6599 // struct A { int &&r; };
6600 // struct B : A { B() : A{0} {} };
6601 // In this case, use the outermost field decl as the context.
6602 return {InitField, LK_MemInitializer};
6603
6604 case InitializedEntity::EK_BlockElement:
6605 case InitializedEntity::EK_LambdaToBlockConversionBlockElement:
6606 case InitializedEntity::EK_LambdaCapture:
6607 case InitializedEntity::EK_VectorElement:
6608 case InitializedEntity::EK_ComplexElement:
6609 return {nullptr, LK_FullExpression};
6610
6611 case InitializedEntity::EK_Exception:
6612 // FIXME: Can we diagnose lifetime problems with exceptions?
6613 return {nullptr, LK_FullExpression};
6614 }
6615 llvm_unreachable("unknown entity kind")::llvm::llvm_unreachable_internal("unknown entity kind", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 6615)
;
6616}
6617
6618namespace {
6619enum ReferenceKind {
6620 /// Lifetime would be extended by a reference binding to a temporary.
6621 RK_ReferenceBinding,
6622 /// Lifetime would be extended by a std::initializer_list object binding to
6623 /// its backing array.
6624 RK_StdInitializerList,
6625};
6626
6627/// A temporary or local variable. This will be one of:
6628/// * A MaterializeTemporaryExpr.
6629/// * A DeclRefExpr whose declaration is a local.
6630/// * An AddrLabelExpr.
6631/// * A BlockExpr for a block with captures.
6632using Local = Expr*;
6633
6634/// Expressions we stepped over when looking for the local state. Any steps
6635/// that would inhibit lifetime extension or take us out of subexpressions of
6636/// the initializer are included.
6637struct IndirectLocalPathEntry {
6638 enum EntryKind {
6639 DefaultInit,
6640 AddressOf,
6641 VarInit,
6642 LValToRVal,
6643 LifetimeBoundCall,
6644 GslReferenceInit,
6645 GslPointerInit
6646 } Kind;
6647 Expr *E;
6648 const Decl *D = nullptr;
6649 IndirectLocalPathEntry() {}
6650 IndirectLocalPathEntry(EntryKind K, Expr *E) : Kind(K), E(E) {}
6651 IndirectLocalPathEntry(EntryKind K, Expr *E, const Decl *D)
6652 : Kind(K), E(E), D(D) {}
6653};
6654
6655using IndirectLocalPath = llvm::SmallVectorImpl<IndirectLocalPathEntry>;
6656
6657struct RevertToOldSizeRAII {
6658 IndirectLocalPath &Path;
6659 unsigned OldSize = Path.size();
6660 RevertToOldSizeRAII(IndirectLocalPath &Path) : Path(Path) {}
6661 ~RevertToOldSizeRAII() { Path.resize(OldSize); }
6662};
6663
6664using LocalVisitor = llvm::function_ref<bool(IndirectLocalPath &Path, Local L,
6665 ReferenceKind RK)>;
6666}
6667
6668static bool isVarOnPath(IndirectLocalPath &Path, VarDecl *VD) {
6669 for (auto E : Path)
6670 if (E.Kind == IndirectLocalPathEntry::VarInit && E.D == VD)
6671 return true;
6672 return false;
6673}
6674
6675static bool pathContainsInit(IndirectLocalPath &Path) {
6676 return llvm::any_of(Path, [=](IndirectLocalPathEntry E) {
6677 return E.Kind == IndirectLocalPathEntry::DefaultInit ||
6678 E.Kind == IndirectLocalPathEntry::VarInit;
6679 });
6680}
6681
6682static void visitLocalsRetainedByInitializer(IndirectLocalPath &Path,
6683 Expr *Init, LocalVisitor Visit,
6684 bool RevisitSubinits,
6685 bool EnableLifetimeWarnings);
6686
6687static void visitLocalsRetainedByReferenceBinding(IndirectLocalPath &Path,
6688 Expr *Init, ReferenceKind RK,
6689 LocalVisitor Visit,
6690 bool EnableLifetimeWarnings);
6691
6692template <typename T> static bool isRecordWithAttr(QualType Type) {
6693 if (auto *RD = Type->getAsCXXRecordDecl())
6694 return RD->hasAttr<T>();
6695 return false;
6696}
6697
6698// Decl::isInStdNamespace will return false for iterators in some STL
6699// implementations due to them being defined in a namespace outside of the std
6700// namespace.
6701static bool isInStlNamespace(const Decl *D) {
6702 const DeclContext *DC = D->getDeclContext();
6703 if (!DC)
6704 return false;
6705 if (const auto *ND = dyn_cast<NamespaceDecl>(DC))
6706 if (const IdentifierInfo *II = ND->getIdentifier()) {
6707 StringRef Name = II->getName();
6708 if (Name.size() >= 2 && Name.front() == '_' &&
6709 (Name[1] == '_' || isUppercase(Name[1])))
6710 return true;
6711 }
6712
6713 return DC->isStdNamespace();
6714}
6715
6716static bool shouldTrackImplicitObjectArg(const CXXMethodDecl *Callee) {
6717 if (auto *Conv = dyn_cast_or_null<CXXConversionDecl>(Callee))
6718 if (isRecordWithAttr<PointerAttr>(Conv->getConversionType()))
6719 return true;
6720 if (!isInStlNamespace(Callee->getParent()))
6721 return false;
6722 if (!isRecordWithAttr<PointerAttr>(Callee->getThisObjectType()) &&
6723 !isRecordWithAttr<OwnerAttr>(Callee->getThisObjectType()))
6724 return false;
6725 if (Callee->getReturnType()->isPointerType() ||
6726 isRecordWithAttr<PointerAttr>(Callee->getReturnType())) {
6727 if (!Callee->getIdentifier())
6728 return false;
6729 return llvm::StringSwitch<bool>(Callee->getName())
6730 .Cases("begin", "rbegin", "cbegin", "crbegin", true)
6731 .Cases("end", "rend", "cend", "crend", true)
6732 .Cases("c_str", "data", "get", true)
6733 // Map and set types.
6734 .Cases("find", "equal_range", "lower_bound", "upper_bound", true)
6735 .Default(false);
6736 } else if (Callee->getReturnType()->isReferenceType()) {
6737 if (!Callee->getIdentifier()) {
6738 auto OO = Callee->getOverloadedOperator();
6739 return OO == OverloadedOperatorKind::OO_Subscript ||
6740 OO == OverloadedOperatorKind::OO_Star;
6741 }
6742 return llvm::StringSwitch<bool>(Callee->getName())
6743 .Cases("front", "back", "at", "top", "value", true)
6744 .Default(false);
6745 }
6746 return false;
6747}
6748
6749static bool shouldTrackFirstArgument(const FunctionDecl *FD) {
6750 if (!FD->getIdentifier() || FD->getNumParams() != 1)
6751 return false;
6752 const auto *RD = FD->getParamDecl(0)->getType()->getPointeeCXXRecordDecl();
6753 if (!FD->isInStdNamespace() || !RD || !RD->isInStdNamespace())
6754 return false;
6755 if (!isRecordWithAttr<PointerAttr>(QualType(RD->getTypeForDecl(), 0)) &&
6756 !isRecordWithAttr<OwnerAttr>(QualType(RD->getTypeForDecl(), 0)))
6757 return false;
6758 if (FD->getReturnType()->isPointerType() ||
6759 isRecordWithAttr<PointerAttr>(FD->getReturnType())) {
6760 return llvm::StringSwitch<bool>(FD->getName())
6761 .Cases("begin", "rbegin", "cbegin", "crbegin", true)
6762 .Cases("end", "rend", "cend", "crend", true)
6763 .Case("data", true)
6764 .Default(false);
6765 } else if (FD->getReturnType()->isReferenceType()) {
6766 return llvm::StringSwitch<bool>(FD->getName())
6767 .Cases("get", "any_cast", true)
6768 .Default(false);
6769 }
6770 return false;
6771}
6772
6773static void handleGslAnnotatedTypes(IndirectLocalPath &Path, Expr *Call,
6774 LocalVisitor Visit) {
6775 auto VisitPointerArg = [&](const Decl *D, Expr *Arg, bool Value) {
6776 // We are not interested in the temporary base objects of gsl Pointers:
6777 // Temp().ptr; // Here ptr might not dangle.
6778 if (isa<MemberExpr>(Arg->IgnoreImpCasts()))
6779 return;
6780 // Once we initialized a value with a reference, it can no longer dangle.
6781 if (!Value) {
6782 for (auto It = Path.rbegin(), End = Path.rend(); It != End; ++It) {
6783 if (It->Kind == IndirectLocalPathEntry::GslReferenceInit)
6784 continue;
6785 if (It->Kind == IndirectLocalPathEntry::GslPointerInit)
6786 return;
6787 break;
6788 }
6789 }
6790 Path.push_back({Value ? IndirectLocalPathEntry::GslPointerInit
6791 : IndirectLocalPathEntry::GslReferenceInit,
6792 Arg, D});
6793 if (Arg->isGLValue())
6794 visitLocalsRetainedByReferenceBinding(Path, Arg, RK_ReferenceBinding,
6795 Visit,
6796 /*EnableLifetimeWarnings=*/true);
6797 else
6798 visitLocalsRetainedByInitializer(Path, Arg, Visit, true,
6799 /*EnableLifetimeWarnings=*/true);
6800 Path.pop_back();
6801 };
6802
6803 if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Call)) {
6804 const auto *MD = cast_or_null<CXXMethodDecl>(MCE->getDirectCallee());
6805 if (MD && shouldTrackImplicitObjectArg(MD))
6806 VisitPointerArg(MD, MCE->getImplicitObjectArgument(),
6807 !MD->getReturnType()->isReferenceType());
6808 return;
6809 } else if (auto *OCE = dyn_cast<CXXOperatorCallExpr>(Call)) {
6810 FunctionDecl *Callee = OCE->getDirectCallee();
6811 if (Callee && Callee->isCXXInstanceMember() &&
6812 shouldTrackImplicitObjectArg(cast<CXXMethodDecl>(Callee)))
6813 VisitPointerArg(Callee, OCE->getArg(0),
6814 !Callee->getReturnType()->isReferenceType());
6815 return;
6816 } else if (auto *CE = dyn_cast<CallExpr>(Call)) {
6817 FunctionDecl *Callee = CE->getDirectCallee();
6818 if (Callee && shouldTrackFirstArgument(Callee))
6819 VisitPointerArg(Callee, CE->getArg(0),
6820 !Callee->getReturnType()->isReferenceType());
6821 return;
6822 }
6823
6824 if (auto *CCE = dyn_cast<CXXConstructExpr>(Call)) {
6825 const auto *Ctor = CCE->getConstructor();
6826 const CXXRecordDecl *RD = Ctor->getParent();
6827 if (CCE->getNumArgs() > 0 && RD->hasAttr<PointerAttr>())
6828 VisitPointerArg(Ctor->getParamDecl(0), CCE->getArgs()[0], true);
6829 }
6830}
6831
6832static bool implicitObjectParamIsLifetimeBound(const FunctionDecl *FD) {
6833 const TypeSourceInfo *TSI = FD->getTypeSourceInfo();
6834 if (!TSI)
6835 return false;
6836 // Don't declare this variable in the second operand of the for-statement;
6837 // GCC miscompiles that by ending its lifetime before evaluating the
6838 // third operand. See gcc.gnu.org/PR86769.
6839 AttributedTypeLoc ATL;
6840 for (TypeLoc TL = TSI->getTypeLoc();
6841 (ATL = TL.getAsAdjusted<AttributedTypeLoc>());
6842 TL = ATL.getModifiedLoc()) {
6843 if (ATL.getAttrAs<LifetimeBoundAttr>())
6844 return true;
6845 }
6846 return false;
6847}
6848
6849static void visitLifetimeBoundArguments(IndirectLocalPath &Path, Expr *Call,
6850 LocalVisitor Visit) {
6851 const FunctionDecl *Callee;
6852 ArrayRef<Expr*> Args;
6853
6854 if (auto *CE = dyn_cast<CallExpr>(Call)) {
6855 Callee = CE->getDirectCallee();
6856 Args = llvm::makeArrayRef(CE->getArgs(), CE->getNumArgs());
6857 } else {
6858 auto *CCE = cast<CXXConstructExpr>(Call);
6859 Callee = CCE->getConstructor();
6860 Args = llvm::makeArrayRef(CCE->getArgs(), CCE->getNumArgs());
6861 }
6862 if (!Callee)
6863 return;
6864
6865 Expr *ObjectArg = nullptr;
6866 if (isa<CXXOperatorCallExpr>(Call) && Callee->isCXXInstanceMember()) {
6867 ObjectArg = Args[0];
6868 Args = Args.slice(1);
6869 } else if (auto *MCE = dyn_cast<CXXMemberCallExpr>(Call)) {
6870 ObjectArg = MCE->getImplicitObjectArgument();
6871 }
6872
6873 auto VisitLifetimeBoundArg = [&](const Decl *D, Expr *Arg) {
6874 Path.push_back({IndirectLocalPathEntry::LifetimeBoundCall, Arg, D});
6875 if (Arg->isGLValue())
6876 visitLocalsRetainedByReferenceBinding(Path, Arg, RK_ReferenceBinding,
6877 Visit,
6878 /*EnableLifetimeWarnings=*/false);
6879 else
6880 visitLocalsRetainedByInitializer(Path, Arg, Visit, true,
6881 /*EnableLifetimeWarnings=*/false);
6882 Path.pop_back();
6883 };
6884
6885 if (ObjectArg && implicitObjectParamIsLifetimeBound(Callee))
6886 VisitLifetimeBoundArg(Callee, ObjectArg);
6887
6888 for (unsigned I = 0,
6889 N = std::min<unsigned>(Callee->getNumParams(), Args.size());
6890 I != N; ++I) {
6891 if (Callee->getParamDecl(I)->hasAttr<LifetimeBoundAttr>())
6892 VisitLifetimeBoundArg(Callee->getParamDecl(I), Args[I]);
6893 }
6894}
6895
6896/// Visit the locals that would be reachable through a reference bound to the
6897/// glvalue expression \c Init.
6898static void visitLocalsRetainedByReferenceBinding(IndirectLocalPath &Path,
6899 Expr *Init, ReferenceKind RK,
6900 LocalVisitor Visit,
6901 bool EnableLifetimeWarnings) {
6902 RevertToOldSizeRAII RAII(Path);
6903
6904 // Walk past any constructs which we can lifetime-extend across.
6905 Expr *Old;
6906 do {
6907 Old = Init;
6908
6909 if (auto *FE = dyn_cast<FullExpr>(Init))
6910 Init = FE->getSubExpr();
6911
6912 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) {
6913 // If this is just redundant braces around an initializer, step over it.
6914 if (ILE->isTransparent())
6915 Init = ILE->getInit(0);
6916 }
6917
6918 // Step over any subobject adjustments; we may have a materialized
6919 // temporary inside them.
6920 Init = const_cast<Expr *>(Init->skipRValueSubobjectAdjustments());
6921
6922 // Per current approach for DR1376, look through casts to reference type
6923 // when performing lifetime extension.
6924 if (CastExpr *CE = dyn_cast<CastExpr>(Init))
6925 if (CE->getSubExpr()->isGLValue())
6926 Init = CE->getSubExpr();
6927
6928 // Per the current approach for DR1299, look through array element access
6929 // on array glvalues when performing lifetime extension.
6930 if (auto *ASE = dyn_cast<ArraySubscriptExpr>(Init)) {
6931 Init = ASE->getBase();
6932 auto *ICE = dyn_cast<ImplicitCastExpr>(Init);
6933 if (ICE && ICE->getCastKind() == CK_ArrayToPointerDecay)
6934 Init = ICE->getSubExpr();
6935 else
6936 // We can't lifetime extend through this but we might still find some
6937 // retained temporaries.
6938 return visitLocalsRetainedByInitializer(Path, Init, Visit, true,
6939 EnableLifetimeWarnings);
6940 }
6941
6942 // Step into CXXDefaultInitExprs so we can diagnose cases where a
6943 // constructor inherits one as an implicit mem-initializer.
6944 if (auto *DIE = dyn_cast<CXXDefaultInitExpr>(Init)) {
6945 Path.push_back(
6946 {IndirectLocalPathEntry::DefaultInit, DIE, DIE->getField()});
6947 Init = DIE->getExpr();
6948 }
6949 } while (Init != Old);
6950
6951 if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(Init)) {
6952 if (Visit(Path, Local(MTE), RK))
6953 visitLocalsRetainedByInitializer(Path, MTE->getSubExpr(), Visit, true,
6954 EnableLifetimeWarnings);
6955 }
6956
6957 if (isa<CallExpr>(Init)) {
6958 if (EnableLifetimeWarnings)
6959 handleGslAnnotatedTypes(Path, Init, Visit);
6960 return visitLifetimeBoundArguments(Path, Init, Visit);
6961 }
6962
6963 switch (Init->getStmtClass()) {
6964 case Stmt::DeclRefExprClass: {
6965 // If we find the name of a local non-reference parameter, we could have a
6966 // lifetime problem.
6967 auto *DRE = cast<DeclRefExpr>(Init);
6968 auto *VD = dyn_cast<VarDecl>(DRE->getDecl());
6969 if (VD && VD->hasLocalStorage() &&
6970 !DRE->refersToEnclosingVariableOrCapture()) {
6971 if (!VD->getType()->isReferenceType()) {
6972 Visit(Path, Local(DRE), RK);
6973 } else if (isa<ParmVarDecl>(DRE->getDecl())) {
6974 // The lifetime of a reference parameter is unknown; assume it's OK
6975 // for now.
6976 break;
6977 } else if (VD->getInit() && !isVarOnPath(Path, VD)) {
6978 Path.push_back({IndirectLocalPathEntry::VarInit, DRE, VD});
6979 visitLocalsRetainedByReferenceBinding(Path, VD->getInit(),
6980 RK_ReferenceBinding, Visit,
6981 EnableLifetimeWarnings);
6982 }
6983 }
6984 break;
6985 }
6986
6987 case Stmt::UnaryOperatorClass: {
6988 // The only unary operator that make sense to handle here
6989 // is Deref. All others don't resolve to a "name." This includes
6990 // handling all sorts of rvalues passed to a unary operator.
6991 const UnaryOperator *U = cast<UnaryOperator>(Init);
6992 if (U->getOpcode() == UO_Deref)
6993 visitLocalsRetainedByInitializer(Path, U->getSubExpr(), Visit, true,
6994 EnableLifetimeWarnings);
6995 break;
6996 }
6997
6998 case Stmt::OMPArraySectionExprClass: {
6999 visitLocalsRetainedByInitializer(Path,
7000 cast<OMPArraySectionExpr>(Init)->getBase(),
7001 Visit, true, EnableLifetimeWarnings);
7002 break;
7003 }
7004
7005 case Stmt::ConditionalOperatorClass:
7006 case Stmt::BinaryConditionalOperatorClass: {
7007 auto *C = cast<AbstractConditionalOperator>(Init);
7008 if (!C->getTrueExpr()->getType()->isVoidType())
7009 visitLocalsRetainedByReferenceBinding(Path, C->getTrueExpr(), RK, Visit,
7010 EnableLifetimeWarnings);
7011 if (!C->getFalseExpr()->getType()->isVoidType())
7012 visitLocalsRetainedByReferenceBinding(Path, C->getFalseExpr(), RK, Visit,
7013 EnableLifetimeWarnings);
7014 break;
7015 }
7016
7017 // FIXME: Visit the left-hand side of an -> or ->*.
7018
7019 default:
7020 break;
7021 }
7022}
7023
7024/// Visit the locals that would be reachable through an object initialized by
7025/// the prvalue expression \c Init.
7026static void visitLocalsRetainedByInitializer(IndirectLocalPath &Path,
7027 Expr *Init, LocalVisitor Visit,
7028 bool RevisitSubinits,
7029 bool EnableLifetimeWarnings) {
7030 RevertToOldSizeRAII RAII(Path);
7031
7032 Expr *Old;
7033 do {
7034 Old = Init;
7035
7036 // Step into CXXDefaultInitExprs so we can diagnose cases where a
7037 // constructor inherits one as an implicit mem-initializer.
7038 if (auto *DIE = dyn_cast<CXXDefaultInitExpr>(Init)) {
7039 Path.push_back({IndirectLocalPathEntry::DefaultInit, DIE, DIE->getField()});
7040 Init = DIE->getExpr();
7041 }
7042
7043 if (auto *FE = dyn_cast<FullExpr>(Init))
7044 Init = FE->getSubExpr();
7045
7046 // Dig out the expression which constructs the extended temporary.
7047 Init = const_cast<Expr *>(Init->skipRValueSubobjectAdjustments());
7048
7049 if (CXXBindTemporaryExpr *BTE = dyn_cast<CXXBindTemporaryExpr>(Init))
7050 Init = BTE->getSubExpr();
7051
7052 Init = Init->IgnoreParens();
7053
7054 // Step over value-preserving rvalue casts.
7055 if (auto *CE = dyn_cast<CastExpr>(Init)) {
7056 switch (CE->getCastKind()) {
7057 case CK_LValueToRValue:
7058 // If we can match the lvalue to a const object, we can look at its
7059 // initializer.
7060 Path.push_back({IndirectLocalPathEntry::LValToRVal, CE});
7061 return visitLocalsRetainedByReferenceBinding(
7062 Path, Init, RK_ReferenceBinding,
7063 [&](IndirectLocalPath &Path, Local L, ReferenceKind RK) -> bool {
7064 if (auto *DRE = dyn_cast<DeclRefExpr>(L)) {
7065 auto *VD = dyn_cast<VarDecl>(DRE->getDecl());
7066 if (VD && VD->getType().isConstQualified() && VD->getInit() &&
7067 !isVarOnPath(Path, VD)) {
7068 Path.push_back({IndirectLocalPathEntry::VarInit, DRE, VD});
7069 visitLocalsRetainedByInitializer(Path, VD->getInit(), Visit, true,
7070 EnableLifetimeWarnings);
7071 }
7072 } else if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(L)) {
7073 if (MTE->getType().isConstQualified())
7074 visitLocalsRetainedByInitializer(Path, MTE->getSubExpr(), Visit,
7075 true, EnableLifetimeWarnings);
7076 }
7077 return false;
7078 }, EnableLifetimeWarnings);
7079
7080 // We assume that objects can be retained by pointers cast to integers,
7081 // but not if the integer is cast to floating-point type or to _Complex.
7082 // We assume that casts to 'bool' do not preserve enough information to
7083 // retain a local object.
7084 case CK_NoOp:
7085 case CK_BitCast:
7086 case CK_BaseToDerived:
7087 case CK_DerivedToBase:
7088 case CK_UncheckedDerivedToBase:
7089 case CK_Dynamic:
7090 case CK_ToUnion:
7091 case CK_UserDefinedConversion:
7092 case CK_ConstructorConversion:
7093 case CK_IntegralToPointer:
7094 case CK_PointerToIntegral:
7095 case CK_VectorSplat:
7096 case CK_IntegralCast:
7097 case CK_CPointerToObjCPointerCast:
7098 case CK_BlockPointerToObjCPointerCast:
7099 case CK_AnyPointerToBlockPointerCast:
7100 case CK_AddressSpaceConversion:
7101 break;
7102
7103 case CK_ArrayToPointerDecay:
7104 // Model array-to-pointer decay as taking the address of the array
7105 // lvalue.
7106 Path.push_back({IndirectLocalPathEntry::AddressOf, CE});
7107 return visitLocalsRetainedByReferenceBinding(Path, CE->getSubExpr(),
7108 RK_ReferenceBinding, Visit,
7109 EnableLifetimeWarnings);
7110
7111 default:
7112 return;
7113 }
7114
7115 Init = CE->getSubExpr();
7116 }
7117 } while (Old != Init);
7118
7119 // C++17 [dcl.init.list]p6:
7120 // initializing an initializer_list object from the array extends the
7121 // lifetime of the array exactly like binding a reference to a temporary.
7122 if (auto *ILE = dyn_cast<CXXStdInitializerListExpr>(Init))
7123 return visitLocalsRetainedByReferenceBinding(Path, ILE->getSubExpr(),
7124 RK_StdInitializerList, Visit,
7125 EnableLifetimeWarnings);
7126
7127 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) {
7128 // We already visited the elements of this initializer list while
7129 // performing the initialization. Don't visit them again unless we've
7130 // changed the lifetime of the initialized entity.
7131 if (!RevisitSubinits)
7132 return;
7133
7134 if (ILE->isTransparent())
7135 return visitLocalsRetainedByInitializer(Path, ILE->getInit(0), Visit,
7136 RevisitSubinits,
7137 EnableLifetimeWarnings);
7138
7139 if (ILE->getType()->isArrayType()) {
7140 for (unsigned I = 0, N = ILE->getNumInits(); I != N; ++I)
7141 visitLocalsRetainedByInitializer(Path, ILE->getInit(I), Visit,
7142 RevisitSubinits,
7143 EnableLifetimeWarnings);
7144 return;
7145 }
7146
7147 if (CXXRecordDecl *RD = ILE->getType()->getAsCXXRecordDecl()) {
7148 assert(RD->isAggregate() && "aggregate init on non-aggregate")((RD->isAggregate() && "aggregate init on non-aggregate"
) ? static_cast<void> (0) : __assert_fail ("RD->isAggregate() && \"aggregate init on non-aggregate\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 7148, __PRETTY_FUNCTION__))
;
7149
7150 // If we lifetime-extend a braced initializer which is initializing an
7151 // aggregate, and that aggregate contains reference members which are
7152 // bound to temporaries, those temporaries are also lifetime-extended.
7153 if (RD->isUnion() && ILE->getInitializedFieldInUnion() &&
7154 ILE->getInitializedFieldInUnion()->getType()->isReferenceType())
7155 visitLocalsRetainedByReferenceBinding(Path, ILE->getInit(0),
7156 RK_ReferenceBinding, Visit,
7157 EnableLifetimeWarnings);
7158 else {
7159 unsigned Index = 0;
7160 for (; Index < RD->getNumBases() && Index < ILE->getNumInits(); ++Index)
7161 visitLocalsRetainedByInitializer(Path, ILE->getInit(Index), Visit,
7162 RevisitSubinits,
7163 EnableLifetimeWarnings);
7164 for (const auto *I : RD->fields()) {
7165 if (Index >= ILE->getNumInits())
7166 break;
7167 if (I->isUnnamedBitfield())
7168 continue;
7169 Expr *SubInit = ILE->getInit(Index);
7170 if (I->getType()->isReferenceType())
7171 visitLocalsRetainedByReferenceBinding(Path, SubInit,
7172 RK_ReferenceBinding, Visit,
7173 EnableLifetimeWarnings);
7174 else
7175 // This might be either aggregate-initialization of a member or
7176 // initialization of a std::initializer_list object. Regardless,
7177 // we should recursively lifetime-extend that initializer.
7178 visitLocalsRetainedByInitializer(Path, SubInit, Visit,
7179 RevisitSubinits,
7180 EnableLifetimeWarnings);
7181 ++Index;
7182 }
7183 }
7184 }
7185 return;
7186 }
7187
7188 // The lifetime of an init-capture is that of the closure object constructed
7189 // by a lambda-expression.
7190 if (auto *LE = dyn_cast<LambdaExpr>(Init)) {
7191 for (Expr *E : LE->capture_inits()) {
7192 if (!E)
7193 continue;
7194 if (E->isGLValue())
7195 visitLocalsRetainedByReferenceBinding(Path, E, RK_ReferenceBinding,
7196 Visit, EnableLifetimeWarnings);
7197 else
7198 visitLocalsRetainedByInitializer(Path, E, Visit, true,
7199 EnableLifetimeWarnings);
7200 }
7201 }
7202
7203 if (isa<CallExpr>(Init) || isa<CXXConstructExpr>(Init)) {
7204 if (EnableLifetimeWarnings)
7205 handleGslAnnotatedTypes(Path, Init, Visit);
7206 return visitLifetimeBoundArguments(Path, Init, Visit);
7207 }
7208
7209 switch (Init->getStmtClass()) {
7210 case Stmt::UnaryOperatorClass: {
7211 auto *UO = cast<UnaryOperator>(Init);
7212 // If the initializer is the address of a local, we could have a lifetime
7213 // problem.
7214 if (UO->getOpcode() == UO_AddrOf) {
7215 // If this is &rvalue, then it's ill-formed and we have already diagnosed
7216 // it. Don't produce a redundant warning about the lifetime of the
7217 // temporary.
7218 if (isa<MaterializeTemporaryExpr>(UO->getSubExpr()))
7219 return;
7220
7221 Path.push_back({IndirectLocalPathEntry::AddressOf, UO});
7222 visitLocalsRetainedByReferenceBinding(Path, UO->getSubExpr(),
7223 RK_ReferenceBinding, Visit,
7224 EnableLifetimeWarnings);
7225 }
7226 break;
7227 }
7228
7229 case Stmt::BinaryOperatorClass: {
7230 // Handle pointer arithmetic.
7231 auto *BO = cast<BinaryOperator>(Init);
7232 BinaryOperatorKind BOK = BO->getOpcode();
7233 if (!BO->getType()->isPointerType() || (BOK != BO_Add && BOK != BO_Sub))
7234 break;
7235
7236 if (BO->getLHS()->getType()->isPointerType())
7237 visitLocalsRetainedByInitializer(Path, BO->getLHS(), Visit, true,
7238 EnableLifetimeWarnings);
7239 else if (BO->getRHS()->getType()->isPointerType())
7240 visitLocalsRetainedByInitializer(Path, BO->getRHS(), Visit, true,
7241 EnableLifetimeWarnings);
7242 break;
7243 }
7244
7245 case Stmt::ConditionalOperatorClass:
7246 case Stmt::BinaryConditionalOperatorClass: {
7247 auto *C = cast<AbstractConditionalOperator>(Init);
7248 // In C++, we can have a throw-expression operand, which has 'void' type
7249 // and isn't interesting from a lifetime perspective.
7250 if (!C->getTrueExpr()->getType()->isVoidType())
7251 visitLocalsRetainedByInitializer(Path, C->getTrueExpr(), Visit, true,
7252 EnableLifetimeWarnings);
7253 if (!C->getFalseExpr()->getType()->isVoidType())
7254 visitLocalsRetainedByInitializer(Path, C->getFalseExpr(), Visit, true,
7255 EnableLifetimeWarnings);
7256 break;
7257 }
7258
7259 case Stmt::BlockExprClass:
7260 if (cast<BlockExpr>(Init)->getBlockDecl()->hasCaptures()) {
7261 // This is a local block, whose lifetime is that of the function.
7262 Visit(Path, Local(cast<BlockExpr>(Init)), RK_ReferenceBinding);
7263 }
7264 break;
7265
7266 case Stmt::AddrLabelExprClass:
7267 // We want to warn if the address of a label would escape the function.
7268 Visit(Path, Local(cast<AddrLabelExpr>(Init)), RK_ReferenceBinding);
7269 break;
7270
7271 default:
7272 break;
7273 }
7274}
7275
7276/// Determine whether this is an indirect path to a temporary that we are
7277/// supposed to lifetime-extend along (but don't).
7278static bool shouldLifetimeExtendThroughPath(const IndirectLocalPath &Path) {
7279 for (auto Elem : Path) {
7280 if (Elem.Kind != IndirectLocalPathEntry::DefaultInit)
7281 return false;
7282 }
7283 return true;
7284}
7285
7286/// Find the range for the first interesting entry in the path at or after I.
7287static SourceRange nextPathEntryRange(const IndirectLocalPath &Path, unsigned I,
7288 Expr *E) {
7289 for (unsigned N = Path.size(); I != N; ++I) {
7290 switch (Path[I].Kind) {
7291 case IndirectLocalPathEntry::AddressOf:
7292 case IndirectLocalPathEntry::LValToRVal:
7293 case IndirectLocalPathEntry::LifetimeBoundCall:
7294 case IndirectLocalPathEntry::GslReferenceInit:
7295 case IndirectLocalPathEntry::GslPointerInit:
7296 // These exist primarily to mark the path as not permitting or
7297 // supporting lifetime extension.
7298 break;
7299
7300 case IndirectLocalPathEntry::VarInit:
7301 if (cast<VarDecl>(Path[I].D)->isImplicit())
7302 return SourceRange();
7303 LLVM_FALLTHROUGH[[gnu::fallthrough]];
7304 case IndirectLocalPathEntry::DefaultInit:
7305 return Path[I].E->getSourceRange();
7306 }
7307 }
7308 return E->getSourceRange();
7309}
7310
7311static bool pathOnlyInitializesGslPointer(IndirectLocalPath &Path) {
7312 for (auto It = Path.rbegin(), End = Path.rend(); It != End; ++It) {
7313 if (It->Kind == IndirectLocalPathEntry::VarInit)
7314 continue;
7315 if (It->Kind == IndirectLocalPathEntry::AddressOf)
7316 continue;
7317 return It->Kind == IndirectLocalPathEntry::GslPointerInit ||
7318 It->Kind == IndirectLocalPathEntry::GslReferenceInit;
7319 }
7320 return false;
7321}
7322
7323void Sema::checkInitializerLifetime(const InitializedEntity &Entity,
7324 Expr *Init) {
7325 LifetimeResult LR = getEntityLifetime(&Entity);
7326 LifetimeKind LK = LR.getInt();
7327 const InitializedEntity *ExtendingEntity = LR.getPointer();
7328
7329 // If this entity doesn't have an interesting lifetime, don't bother looking
7330 // for temporaries within its initializer.
7331 if (LK == LK_FullExpression)
7332 return;
7333
7334 auto TemporaryVisitor = [&](IndirectLocalPath &Path, Local L,
7335 ReferenceKind RK) -> bool {
7336 SourceRange DiagRange = nextPathEntryRange(Path, 0, L);
7337 SourceLocation DiagLoc = DiagRange.getBegin();
7338
7339 auto *MTE = dyn_cast<MaterializeTemporaryExpr>(L);
7340
7341 bool IsGslPtrInitWithGslTempOwner = false;
7342 bool IsLocalGslOwner = false;
7343 if (pathOnlyInitializesGslPointer(Path)) {
7344 if (isa<DeclRefExpr>(L)) {
7345 // We do not want to follow the references when returning a pointer originating
7346 // from a local owner to avoid the following false positive:
7347 // int &p = *localUniquePtr;
7348 // someContainer.add(std::move(localUniquePtr));
7349 // return p;
7350 IsLocalGslOwner = isRecordWithAttr<OwnerAttr>(L->getType());
7351 if (pathContainsInit(Path) || !IsLocalGslOwner)
7352 return false;
7353 } else {
7354 IsGslPtrInitWithGslTempOwner = MTE && !MTE->getExtendingDecl() &&
7355 isRecordWithAttr<OwnerAttr>(MTE->getType());
7356 // Skipping a chain of initializing gsl::Pointer annotated objects.
7357 // We are looking only for the final source to find out if it was
7358 // a local or temporary owner or the address of a local variable/param.
7359 if (!IsGslPtrInitWithGslTempOwner)
7360 return true;
7361 }
7362 }
7363
7364 switch (LK) {
7365 case LK_FullExpression:
7366 llvm_unreachable("already handled this")::llvm::llvm_unreachable_internal("already handled this", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 7366)
;
7367
7368 case LK_Extended: {
7369 if (!MTE) {
7370 // The initialized entity has lifetime beyond the full-expression,
7371 // and the local entity does too, so don't warn.
7372 //
7373 // FIXME: We should consider warning if a static / thread storage
7374 // duration variable retains an automatic storage duration local.
7375 return false;
7376 }
7377
7378 if (IsGslPtrInitWithGslTempOwner && DiagLoc.isValid()) {
7379 Diag(DiagLoc, diag::warn_dangling_lifetime_pointer) << DiagRange;
7380 return false;
7381 }
7382
7383 // Lifetime-extend the temporary.
7384 if (Path.empty()) {
7385 // Update the storage duration of the materialized temporary.
7386 // FIXME: Rebuild the expression instead of mutating it.
7387 MTE->setExtendingDecl(ExtendingEntity->getDecl(),
7388 ExtendingEntity->allocateManglingNumber());
7389 // Also visit the temporaries lifetime-extended by this initializer.
7390 return true;
7391 }
7392
7393 if (shouldLifetimeExtendThroughPath(Path)) {
7394 // We're supposed to lifetime-extend the temporary along this path (per
7395 // the resolution of DR1815), but we don't support that yet.
7396 //
7397 // FIXME: Properly handle this situation. Perhaps the easiest approach
7398 // would be to clone the initializer expression on each use that would
7399 // lifetime extend its temporaries.
7400 Diag(DiagLoc, diag::warn_unsupported_lifetime_extension)
7401 << RK << DiagRange;
7402 } else {
7403 // If the path goes through the initialization of a variable or field,
7404 // it can't possibly reach a temporary created in this full-expression.
7405 // We will have already diagnosed any problems with the initializer.
7406 if (pathContainsInit(Path))
7407 return false;
7408
7409 Diag(DiagLoc, diag::warn_dangling_variable)
7410 << RK << !Entity.getParent()
7411 << ExtendingEntity->getDecl()->isImplicit()
7412 << ExtendingEntity->getDecl() << Init->isGLValue() << DiagRange;
7413 }
7414 break;
7415 }
7416
7417 case LK_MemInitializer: {
7418 if (isa<MaterializeTemporaryExpr>(L)) {
7419 // Under C++ DR1696, if a mem-initializer (or a default member
7420 // initializer used by the absence of one) would lifetime-extend a
7421 // temporary, the program is ill-formed.
7422 if (auto *ExtendingDecl =
7423 ExtendingEntity ? ExtendingEntity->getDecl() : nullptr) {
7424 if (IsGslPtrInitWithGslTempOwner) {
7425 Diag(DiagLoc, diag::warn_dangling_lifetime_pointer_member)
7426 << ExtendingDecl << DiagRange;
7427 Diag(ExtendingDecl->getLocation(),
7428 diag::note_ref_or_ptr_member_declared_here)
7429 << true;
7430 return false;
7431 }
7432 bool IsSubobjectMember = ExtendingEntity != &Entity;
7433 Diag(DiagLoc, shouldLifetimeExtendThroughPath(Path)
7434 ? diag::err_dangling_member
7435 : diag::warn_dangling_member)
7436 << ExtendingDecl << IsSubobjectMember << RK << DiagRange;
7437 // Don't bother adding a note pointing to the field if we're inside
7438 // its default member initializer; our primary diagnostic points to
7439 // the same place in that case.
7440 if (Path.empty() ||
7441 Path.back().Kind != IndirectLocalPathEntry::DefaultInit) {
7442 Diag(ExtendingDecl->getLocation(),
7443 diag::note_lifetime_extending_member_declared_here)
7444 << RK << IsSubobjectMember;
7445 }
7446 } else {
7447 // We have a mem-initializer but no particular field within it; this
7448 // is either a base class or a delegating initializer directly
7449 // initializing the base-class from something that doesn't live long
7450 // enough.
7451 //
7452 // FIXME: Warn on this.
7453 return false;
7454 }
7455 } else {
7456 // Paths via a default initializer can only occur during error recovery
7457 // (there's no other way that a default initializer can refer to a
7458 // local). Don't produce a bogus warning on those cases.
7459 if (pathContainsInit(Path))
7460 return false;
7461
7462 // Suppress false positives for code like the one below:
7463 // Ctor(unique_ptr<T> up) : member(*up), member2(move(up)) {}
7464 if (IsLocalGslOwner && pathOnlyInitializesGslPointer(Path))
7465 return false;
7466
7467 auto *DRE = dyn_cast<DeclRefExpr>(L);
7468 auto *VD = DRE ? dyn_cast<VarDecl>(DRE->getDecl()) : nullptr;
7469 if (!VD) {
7470 // A member was initialized to a local block.
7471 // FIXME: Warn on this.
7472 return false;
7473 }
7474
7475 if (auto *Member =
7476 ExtendingEntity ? ExtendingEntity->getDecl() : nullptr) {
7477 bool IsPointer = !Member->getType()->isReferenceType();
7478 Diag(DiagLoc, IsPointer ? diag::warn_init_ptr_member_to_parameter_addr
7479 : diag::warn_bind_ref_member_to_parameter)
7480 << Member << VD << isa<ParmVarDecl>(VD) << DiagRange;
7481 Diag(Member->getLocation(),
7482 diag::note_ref_or_ptr_member_declared_here)
7483 << (unsigned)IsPointer;
7484 }
7485 }
7486 break;
7487 }
7488
7489 case LK_New:
7490 if (isa<MaterializeTemporaryExpr>(L)) {
7491 if (IsGslPtrInitWithGslTempOwner)
7492 Diag(DiagLoc, diag::warn_dangling_lifetime_pointer) << DiagRange;
7493 else
7494 Diag(DiagLoc, RK == RK_ReferenceBinding
7495 ? diag::warn_new_dangling_reference
7496 : diag::warn_new_dangling_initializer_list)
7497 << !Entity.getParent() << DiagRange;
7498 } else {
7499 // We can't determine if the allocation outlives the local declaration.
7500 return false;
7501 }
7502 break;
7503
7504 case LK_Return:
7505 case LK_StmtExprResult:
7506 if (auto *DRE = dyn_cast<DeclRefExpr>(L)) {
7507 // We can't determine if the local variable outlives the statement
7508 // expression.
7509 if (LK == LK_StmtExprResult)
7510 return false;
7511 Diag(DiagLoc, diag::warn_ret_stack_addr_ref)
7512 << Entity.getType()->isReferenceType() << DRE->getDecl()
7513 << isa<ParmVarDecl>(DRE->getDecl()) << DiagRange;
7514 } else if (isa<BlockExpr>(L)) {
7515 Diag(DiagLoc, diag::err_ret_local_block) << DiagRange;
7516 } else if (isa<AddrLabelExpr>(L)) {
7517 // Don't warn when returning a label from a statement expression.
7518 // Leaving the scope doesn't end its lifetime.
7519 if (LK == LK_StmtExprResult)
7520 return false;
7521 Diag(DiagLoc, diag::warn_ret_addr_label) << DiagRange;
7522 } else {
7523 Diag(DiagLoc, diag::warn_ret_local_temp_addr_ref)
7524 << Entity.getType()->isReferenceType() << DiagRange;
7525 }
7526 break;
7527 }
7528
7529 for (unsigned I = 0; I != Path.size(); ++I) {
7530 auto Elem = Path[I];
7531
7532 switch (Elem.Kind) {
7533 case IndirectLocalPathEntry::AddressOf:
7534 case IndirectLocalPathEntry::LValToRVal:
7535 // These exist primarily to mark the path as not permitting or
7536 // supporting lifetime extension.
7537 break;
7538
7539 case IndirectLocalPathEntry::LifetimeBoundCall:
7540 case IndirectLocalPathEntry::GslPointerInit:
7541 case IndirectLocalPathEntry::GslReferenceInit:
7542 // FIXME: Consider adding a note for these.
7543 break;
7544
7545 case IndirectLocalPathEntry::DefaultInit: {
7546 auto *FD = cast<FieldDecl>(Elem.D);
7547 Diag(FD->getLocation(), diag::note_init_with_default_member_initalizer)
7548 << FD << nextPathEntryRange(Path, I + 1, L);
7549 break;
7550 }
7551
7552 case IndirectLocalPathEntry::VarInit:
7553 const VarDecl *VD = cast<VarDecl>(Elem.D);
7554 Diag(VD->getLocation(), diag::note_local_var_initializer)
7555 << VD->getType()->isReferenceType()
7556 << VD->isImplicit() << VD->getDeclName()
7557 << nextPathEntryRange(Path, I + 1, L);
7558 break;
7559 }
7560 }
7561
7562 // We didn't lifetime-extend, so don't go any further; we don't need more
7563 // warnings or errors on inner temporaries within this one's initializer.
7564 return false;
7565 };
7566
7567 bool EnableLifetimeWarnings = !getDiagnostics().isIgnored(
7568 diag::warn_dangling_lifetime_pointer, SourceLocation());
7569 llvm::SmallVector<IndirectLocalPathEntry, 8> Path;
7570 if (Init->isGLValue())
7571 visitLocalsRetainedByReferenceBinding(Path, Init, RK_ReferenceBinding,
7572 TemporaryVisitor,
7573 EnableLifetimeWarnings);
7574 else
7575 visitLocalsRetainedByInitializer(Path, Init, TemporaryVisitor, false,
7576 EnableLifetimeWarnings);
7577}
7578
7579static void DiagnoseNarrowingInInitList(Sema &S,
7580 const ImplicitConversionSequence &ICS,
7581 QualType PreNarrowingType,
7582 QualType EntityType,
7583 const Expr *PostInit);
7584
7585/// Provide warnings when std::move is used on construction.
7586static void CheckMoveOnConstruction(Sema &S, const Expr *InitExpr,
7587 bool IsReturnStmt) {
7588 if (!InitExpr)
7589 return;
7590
7591 if (S.inTemplateInstantiation())
7592 return;
7593
7594 QualType DestType = InitExpr->getType();
7595 if (!DestType->isRecordType())
7596 return;
7597
7598 unsigned DiagID = 0;
7599 if (IsReturnStmt) {
7600 const CXXConstructExpr *CCE =
7601 dyn_cast<CXXConstructExpr>(InitExpr->IgnoreParens());
7602 if (!CCE || CCE->getNumArgs() != 1)
7603 return;
7604
7605 if (!CCE->getConstructor()->isCopyOrMoveConstructor())
7606 return;
7607
7608 InitExpr = CCE->getArg(0)->IgnoreImpCasts();
7609 }
7610
7611 // Find the std::move call and get the argument.
7612 const CallExpr *CE = dyn_cast<CallExpr>(InitExpr->IgnoreParens());
7613 if (!CE || !CE->isCallToStdMove())
7614 return;
7615
7616 const Expr *Arg = CE->getArg(0)->IgnoreImplicit();
7617
7618 if (IsReturnStmt) {
7619 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg->IgnoreParenImpCasts());
7620 if (!DRE || DRE->refersToEnclosingVariableOrCapture())
7621 return;
7622
7623 const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl());
7624 if (!VD || !VD->hasLocalStorage())
7625 return;
7626
7627 // __block variables are not moved implicitly.
7628 if (VD->hasAttr<BlocksAttr>())
7629 return;
7630
7631 QualType SourceType = VD->getType();
7632 if (!SourceType->isRecordType())
7633 return;
7634
7635 if (!S.Context.hasSameUnqualifiedType(DestType, SourceType)) {
7636 return;
7637 }
7638
7639 // If we're returning a function parameter, copy elision
7640 // is not possible.
7641 if (isa<ParmVarDecl>(VD))
7642 DiagID = diag::warn_redundant_move_on_return;
7643 else
7644 DiagID = diag::warn_pessimizing_move_on_return;
7645 } else {
7646 DiagID = diag::warn_pessimizing_move_on_initialization;
7647 const Expr *ArgStripped = Arg->IgnoreImplicit()->IgnoreParens();
7648 if (!ArgStripped->isRValue() || !ArgStripped->getType()->isRecordType())
7649 return;
7650 }
7651
7652 S.Diag(CE->getBeginLoc(), DiagID);
7653
7654 // Get all the locations for a fix-it. Don't emit the fix-it if any location
7655 // is within a macro.
7656 SourceLocation CallBegin = CE->getCallee()->getBeginLoc();
7657 if (CallBegin.isMacroID())
7658 return;
7659 SourceLocation RParen = CE->getRParenLoc();
7660 if (RParen.isMacroID())
7661 return;
7662 SourceLocation LParen;
7663 SourceLocation ArgLoc = Arg->getBeginLoc();
7664
7665 // Special testing for the argument location. Since the fix-it needs the
7666 // location right before the argument, the argument location can be in a
7667 // macro only if it is at the beginning of the macro.
7668 while (ArgLoc.isMacroID() &&
7669 S.getSourceManager().isAtStartOfImmediateMacroExpansion(ArgLoc)) {
7670 ArgLoc = S.getSourceManager().getImmediateExpansionRange(ArgLoc).getBegin();
7671 }
7672
7673 if (LParen.isMacroID())
7674 return;
7675
7676 LParen = ArgLoc.getLocWithOffset(-1);
7677
7678 S.Diag(CE->getBeginLoc(), diag::note_remove_move)
7679 << FixItHint::CreateRemoval(SourceRange(CallBegin, LParen))
7680 << FixItHint::CreateRemoval(SourceRange(RParen, RParen));
7681}
7682
7683static void CheckForNullPointerDereference(Sema &S, const Expr *E) {
7684 // Check to see if we are dereferencing a null pointer. If so, this is
7685 // undefined behavior, so warn about it. This only handles the pattern
7686 // "*null", which is a very syntactic check.
7687 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E->IgnoreParenCasts()))
7688 if (UO->getOpcode() == UO_Deref &&
7689 UO->getSubExpr()->IgnoreParenCasts()->
7690 isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNotNull)) {
7691 S.DiagRuntimeBehavior(UO->getOperatorLoc(), UO,
7692 S.PDiag(diag::warn_binding_null_to_reference)
7693 << UO->getSubExpr()->getSourceRange());
7694 }
7695}
7696
7697MaterializeTemporaryExpr *
7698Sema::CreateMaterializeTemporaryExpr(QualType T, Expr *Temporary,
7699 bool BoundToLvalueReference) {
7700 auto MTE = new (Context)
7701 MaterializeTemporaryExpr(T, Temporary, BoundToLvalueReference);
7702
7703 // Order an ExprWithCleanups for lifetime marks.
7704 //
7705 // TODO: It'll be good to have a single place to check the access of the
7706 // destructor and generate ExprWithCleanups for various uses. Currently these
7707 // are done in both CreateMaterializeTemporaryExpr and MaybeBindToTemporary,
7708 // but there may be a chance to merge them.
7709 Cleanup.setExprNeedsCleanups(false);
7710 return MTE;
7711}
7712
7713ExprResult Sema::TemporaryMaterializationConversion(Expr *E) {
7714 // In C++98, we don't want to implicitly create an xvalue.
7715 // FIXME: This means that AST consumers need to deal with "prvalues" that
7716 // denote materialized temporaries. Maybe we should add another ValueKind
7717 // for "xvalue pretending to be a prvalue" for C++98 support.
7718 if (!E->isRValue() || !getLangOpts().CPlusPlus11)
7719 return E;
7720
7721 // C++1z [conv.rval]/1: T shall be a complete type.
7722 // FIXME: Does this ever matter (can we form a prvalue of incomplete type)?
7723 // If so, we should check for a non-abstract class type here too.
7724 QualType T = E->getType();
7725 if (RequireCompleteType(E->getExprLoc(), T, diag::err_incomplete_type))
7726 return ExprError();
7727
7728 return CreateMaterializeTemporaryExpr(E->getType(), E, false);
7729}
7730
7731ExprResult Sema::PerformQualificationConversion(Expr *E, QualType Ty,
7732 ExprValueKind VK,
7733 CheckedConversionKind CCK) {
7734
7735 CastKind CK = CK_NoOp;
7736
7737 if (VK == VK_RValue) {
7738 auto PointeeTy = Ty->getPointeeType();
7739 auto ExprPointeeTy = E->getType()->getPointeeType();
7740 if (!PointeeTy.isNull() &&
7741 PointeeTy.getAddressSpace() != ExprPointeeTy.getAddressSpace())
7742 CK = CK_AddressSpaceConversion;
7743 } else if (Ty.getAddressSpace() != E->getType().getAddressSpace()) {
7744 CK = CK_AddressSpaceConversion;
7745 }
7746
7747 return ImpCastExprToType(E, Ty, CK, VK, /*BasePath=*/nullptr, CCK);
7748}
7749
7750ExprResult InitializationSequence::Perform(Sema &S,
7751 const InitializedEntity &Entity,
7752 const InitializationKind &Kind,
7753 MultiExprArg Args,
7754 QualType *ResultType) {
7755 if (Failed()) {
7756 Diagnose(S, Entity, Kind, Args);
7757 return ExprError();
7758 }
7759 if (!ZeroInitializationFixit.empty()) {
7760 unsigned DiagID = diag::err_default_init_const;
7761 if (Decl *D = Entity.getDecl())
7762 if (S.getLangOpts().MSVCCompat && D->hasAttr<SelectAnyAttr>())
7763 DiagID = diag::ext_default_init_const;
7764
7765 // The initialization would have succeeded with this fixit. Since the fixit
7766 // is on the error, we need to build a valid AST in this case, so this isn't
7767 // handled in the Failed() branch above.
7768 QualType DestType = Entity.getType();
7769 S.Diag(Kind.getLocation(), DiagID)
7770 << DestType << (bool)DestType->getAs<RecordType>()
7771 << FixItHint::CreateInsertion(ZeroInitializationFixitLoc,
7772 ZeroInitializationFixit);
7773 }
7774
7775 if (getKind() == DependentSequence) {
7776 // If the declaration is a non-dependent, incomplete array type
7777 // that has an initializer, then its type will be completed once
7778 // the initializer is instantiated.
7779 if (ResultType && !Entity.getType()->isDependentType() &&
7780 Args.size() == 1) {
7781 QualType DeclType = Entity.getType();
7782 if (const IncompleteArrayType *ArrayT
7783 = S.Context.getAsIncompleteArrayType(DeclType)) {
7784 // FIXME: We don't currently have the ability to accurately
7785 // compute the length of an initializer list without
7786 // performing full type-checking of the initializer list
7787 // (since we have to determine where braces are implicitly
7788 // introduced and such). So, we fall back to making the array
7789 // type a dependently-sized array type with no specified
7790 // bound.
7791 if (isa<InitListExpr>((Expr *)Args[0])) {
7792 SourceRange Brackets;
7793
7794 // Scavange the location of the brackets from the entity, if we can.
7795 if (auto *DD = dyn_cast_or_null<DeclaratorDecl>(Entity.getDecl())) {
7796 if (TypeSourceInfo *TInfo = DD->getTypeSourceInfo()) {
7797 TypeLoc TL = TInfo->getTypeLoc();
7798 if (IncompleteArrayTypeLoc ArrayLoc =
7799 TL.getAs<IncompleteArrayTypeLoc>())
7800 Brackets = ArrayLoc.getBracketsRange();
7801 }
7802 }
7803
7804 *ResultType
7805 = S.Context.getDependentSizedArrayType(ArrayT->getElementType(),
7806 /*NumElts=*/nullptr,
7807 ArrayT->getSizeModifier(),
7808 ArrayT->getIndexTypeCVRQualifiers(),
7809 Brackets);
7810 }
7811
7812 }
7813 }
7814 if (Kind.getKind() == InitializationKind::IK_Direct &&
7815 !Kind.isExplicitCast()) {
7816 // Rebuild the ParenListExpr.
7817 SourceRange ParenRange = Kind.getParenOrBraceRange();
7818 return S.ActOnParenListExpr(ParenRange.getBegin(), ParenRange.getEnd(),
7819 Args);
7820 }
7821 assert(Kind.getKind() == InitializationKind::IK_Copy ||((Kind.getKind() == InitializationKind::IK_Copy || Kind.isExplicitCast
() || Kind.getKind() == InitializationKind::IK_DirectList) ? static_cast
<void> (0) : __assert_fail ("Kind.getKind() == InitializationKind::IK_Copy || Kind.isExplicitCast() || Kind.getKind() == InitializationKind::IK_DirectList"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 7823, __PRETTY_FUNCTION__))
7822 Kind.isExplicitCast() ||((Kind.getKind() == InitializationKind::IK_Copy || Kind.isExplicitCast
() || Kind.getKind() == InitializationKind::IK_DirectList) ? static_cast
<void> (0) : __assert_fail ("Kind.getKind() == InitializationKind::IK_Copy || Kind.isExplicitCast() || Kind.getKind() == InitializationKind::IK_DirectList"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 7823, __PRETTY_FUNCTION__))
7823 Kind.getKind() == InitializationKind::IK_DirectList)((Kind.getKind() == InitializationKind::IK_Copy || Kind.isExplicitCast
() || Kind.getKind() == InitializationKind::IK_DirectList) ? static_cast
<void> (0) : __assert_fail ("Kind.getKind() == InitializationKind::IK_Copy || Kind.isExplicitCast() || Kind.getKind() == InitializationKind::IK_DirectList"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 7823, __PRETTY_FUNCTION__))
;
7824 return ExprResult(Args[0]);
7825 }
7826
7827 // No steps means no initialization.
7828 if (Steps.empty())
7829 return ExprResult((Expr *)nullptr);
7830
7831 if (S.getLangOpts().CPlusPlus11 && Entity.getType()->isReferenceType() &&
7832 Args.size() == 1 && isa<InitListExpr>(Args[0]) &&
7833 !Entity.isParameterKind()) {
7834 // Produce a C++98 compatibility warning if we are initializing a reference
7835 // from an initializer list. For parameters, we produce a better warning
7836 // elsewhere.
7837 Expr *Init = Args[0];
7838 S.Diag(Init->getBeginLoc(), diag::warn_cxx98_compat_reference_list_init)
7839 << Init->getSourceRange();
7840 }
7841
7842 // OpenCL v2.0 s6.13.11.1. atomic variables can be initialized in global scope
7843 QualType ETy = Entity.getType();
7844 bool HasGlobalAS = ETy.hasAddressSpace() &&
7845 ETy.getAddressSpace() == LangAS::opencl_global;
7846
7847 if (S.getLangOpts().OpenCLVersion >= 200 &&
7848 ETy->isAtomicType() && !HasGlobalAS &&
7849 Entity.getKind() == InitializedEntity::EK_Variable && Args.size() > 0) {
7850 S.Diag(Args[0]->getBeginLoc(), diag::err_opencl_atomic_init)
7851 << 1
7852 << SourceRange(Entity.getDecl()->getBeginLoc(), Args[0]->getEndLoc());
7853 return ExprError();
7854 }
7855
7856 QualType DestType = Entity.getType().getNonReferenceType();
7857 // FIXME: Ugly hack around the fact that Entity.getType() is not
7858 // the same as Entity.getDecl()->getType() in cases involving type merging,
7859 // and we want latter when it makes sense.
7860 if (ResultType)
7861 *ResultType = Entity.getDecl() ? Entity.getDecl()->getType() :
7862 Entity.getType();
7863
7864 ExprResult CurInit((Expr *)nullptr);
7865 SmallVector<Expr*, 4> ArrayLoopCommonExprs;
7866
7867 // For initialization steps that start with a single initializer,
7868 // grab the only argument out the Args and place it into the "current"
7869 // initializer.
7870 switch (Steps.front().Kind) {
7871 case SK_ResolveAddressOfOverloadedFunction:
7872 case SK_CastDerivedToBaseRValue:
7873 case SK_CastDerivedToBaseXValue:
7874 case SK_CastDerivedToBaseLValue:
7875 case SK_BindReference:
7876 case SK_BindReferenceToTemporary:
7877 case SK_FinalCopy:
7878 case SK_ExtraneousCopyToTemporary:
7879 case SK_UserConversion:
7880 case SK_QualificationConversionLValue:
7881 case SK_QualificationConversionXValue:
7882 case SK_QualificationConversionRValue:
7883 case SK_AtomicConversion:
7884 case SK_ConversionSequence:
7885 case SK_ConversionSequenceNoNarrowing:
7886 case SK_ListInitialization:
7887 case SK_UnwrapInitList:
7888 case SK_RewrapInitList:
7889 case SK_CAssignment:
7890 case SK_StringInit:
7891 case SK_ObjCObjectConversion:
7892 case SK_ArrayLoopIndex:
7893 case SK_ArrayLoopInit:
7894 case SK_ArrayInit:
7895 case SK_GNUArrayInit:
7896 case SK_ParenthesizedArrayInit:
7897 case SK_PassByIndirectCopyRestore:
7898 case SK_PassByIndirectRestore:
7899 case SK_ProduceObjCObject:
7900 case SK_StdInitializerList:
7901 case SK_OCLSamplerInit:
7902 case SK_OCLZeroOpaqueType: {
7903 assert(Args.size() == 1)((Args.size() == 1) ? static_cast<void> (0) : __assert_fail
("Args.size() == 1", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 7903, __PRETTY_FUNCTION__))
;
7904 CurInit = Args[0];
7905 if (!CurInit.get()) return ExprError();
7906 break;
7907 }
7908
7909 case SK_ConstructorInitialization:
7910 case SK_ConstructorInitializationFromList:
7911 case SK_StdInitializerListConstructorCall:
7912 case SK_ZeroInitialization:
7913 break;
7914 }
7915
7916 // Promote from an unevaluated context to an unevaluated list context in
7917 // C++11 list-initialization; we need to instantiate entities usable in
7918 // constant expressions here in order to perform narrowing checks =(
7919 EnterExpressionEvaluationContext Evaluated(
7920 S, EnterExpressionEvaluationContext::InitList,
7921 CurInit.get() && isa<InitListExpr>(CurInit.get()));
7922
7923 // C++ [class.abstract]p2:
7924 // no objects of an abstract class can be created except as subobjects
7925 // of a class derived from it
7926 auto checkAbstractType = [&](QualType T) -> bool {
7927 if (Entity.getKind() == InitializedEntity::EK_Base ||
7928 Entity.getKind() == InitializedEntity::EK_Delegating)
7929 return false;
7930 return S.RequireNonAbstractType(Kind.getLocation(), T,
7931 diag::err_allocation_of_abstract_type);
7932 };
7933
7934 // Walk through the computed steps for the initialization sequence,
7935 // performing the specified conversions along the way.
7936 bool ConstructorInitRequiresZeroInit = false;
7937 for (step_iterator Step = step_begin(), StepEnd = step_end();
7938 Step != StepEnd; ++Step) {
7939 if (CurInit.isInvalid())
7940 return ExprError();
7941
7942 QualType SourceType = CurInit.get() ? CurInit.get()->getType() : QualType();
7943
7944 switch (Step->Kind) {
7945 case SK_ResolveAddressOfOverloadedFunction:
7946 // Overload resolution determined which function invoke; update the
7947 // initializer to reflect that choice.
7948 S.CheckAddressOfMemberAccess(CurInit.get(), Step->Function.FoundDecl);
7949 if (S.DiagnoseUseOfDecl(Step->Function.FoundDecl, Kind.getLocation()))
7950 return ExprError();
7951 CurInit = S.FixOverloadedFunctionReference(CurInit,
7952 Step->Function.FoundDecl,
7953 Step->Function.Function);
7954 break;
7955
7956 case SK_CastDerivedToBaseRValue:
7957 case SK_CastDerivedToBaseXValue:
7958 case SK_CastDerivedToBaseLValue: {
7959 // We have a derived-to-base cast that produces either an rvalue or an
7960 // lvalue. Perform that cast.
7961
7962 CXXCastPath BasePath;
7963
7964 // Casts to inaccessible base classes are allowed with C-style casts.
7965 bool IgnoreBaseAccess = Kind.isCStyleOrFunctionalCast();
7966 if (S.CheckDerivedToBaseConversion(
7967 SourceType, Step->Type, CurInit.get()->getBeginLoc(),
7968 CurInit.get()->getSourceRange(), &BasePath, IgnoreBaseAccess))
7969 return ExprError();
7970
7971 ExprValueKind VK =
7972 Step->Kind == SK_CastDerivedToBaseLValue ?
7973 VK_LValue :
7974 (Step->Kind == SK_CastDerivedToBaseXValue ?
7975 VK_XValue :
7976 VK_RValue);
7977 CurInit =
7978 ImplicitCastExpr::Create(S.Context, Step->Type, CK_DerivedToBase,
7979 CurInit.get(), &BasePath, VK);
7980 break;
7981 }
7982
7983 case SK_BindReference:
7984 // Reference binding does not have any corresponding ASTs.
7985
7986 // Check exception specifications
7987 if (S.CheckExceptionSpecCompatibility(CurInit.get(), DestType))
7988 return ExprError();
7989
7990 // We don't check for e.g. function pointers here, since address
7991 // availability checks should only occur when the function first decays
7992 // into a pointer or reference.
7993 if (CurInit.get()->getType()->isFunctionProtoType()) {
7994 if (auto *DRE = dyn_cast<DeclRefExpr>(CurInit.get()->IgnoreParens())) {
7995 if (auto *FD = dyn_cast<FunctionDecl>(DRE->getDecl())) {
7996 if (!S.checkAddressOfFunctionIsAvailable(FD, /*Complain=*/true,
7997 DRE->getBeginLoc()))
7998 return ExprError();
7999 }
8000 }
8001 }
8002
8003 CheckForNullPointerDereference(S, CurInit.get());
8004 break;
8005
8006 case SK_BindReferenceToTemporary: {
8007 // Make sure the "temporary" is actually an rvalue.
8008 assert(CurInit.get()->isRValue() && "not a temporary")((CurInit.get()->isRValue() && "not a temporary") ?
static_cast<void> (0) : __assert_fail ("CurInit.get()->isRValue() && \"not a temporary\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8008, __PRETTY_FUNCTION__))
;
8009
8010 // Check exception specifications
8011 if (S.CheckExceptionSpecCompatibility(CurInit.get(), DestType))
8012 return ExprError();
8013
8014 // Materialize the temporary into memory.
8015 MaterializeTemporaryExpr *MTE = S.CreateMaterializeTemporaryExpr(
8016 Step->Type, CurInit.get(), Entity.getType()->isLValueReferenceType());
8017 CurInit = MTE;
8018
8019 // If we're extending this temporary to automatic storage duration -- we
8020 // need to register its cleanup during the full-expression's cleanups.
8021 if (MTE->getStorageDuration() == SD_Automatic &&
8022 MTE->getType().isDestructedType())
8023 S.Cleanup.setExprNeedsCleanups(true);
8024 break;
8025 }
8026
8027 case SK_FinalCopy:
8028 if (checkAbstractType(Step->Type))
8029 return ExprError();
8030
8031 // If the overall initialization is initializing a temporary, we already
8032 // bound our argument if it was necessary to do so. If not (if we're
8033 // ultimately initializing a non-temporary), our argument needs to be
8034 // bound since it's initializing a function parameter.
8035 // FIXME: This is a mess. Rationalize temporary destruction.
8036 if (!shouldBindAsTemporary(Entity))
8037 CurInit = S.MaybeBindToTemporary(CurInit.get());
8038 CurInit = CopyObject(S, Step->Type, Entity, CurInit,
8039 /*IsExtraneousCopy=*/false);
8040 break;
8041
8042 case SK_ExtraneousCopyToTemporary:
8043 CurInit = CopyObject(S, Step->Type, Entity, CurInit,
8044 /*IsExtraneousCopy=*/true);
8045 break;
8046
8047 case SK_UserConversion: {
8048 // We have a user-defined conversion that invokes either a constructor
8049 // or a conversion function.
8050 CastKind CastKind;
8051 FunctionDecl *Fn = Step->Function.Function;
8052 DeclAccessPair FoundFn = Step->Function.FoundDecl;
8053 bool HadMultipleCandidates = Step->Function.HadMultipleCandidates;
8054 bool CreatedObject = false;
8055 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Fn)) {
8056 // Build a call to the selected constructor.
8057 SmallVector<Expr*, 8> ConstructorArgs;
8058 SourceLocation Loc = CurInit.get()->getBeginLoc();
8059
8060 // Determine the arguments required to actually perform the constructor
8061 // call.
8062 Expr *Arg = CurInit.get();
8063 if (S.CompleteConstructorCall(Constructor,
8064 MultiExprArg(&Arg, 1),
8065 Loc, ConstructorArgs))
8066 return ExprError();
8067
8068 // Build an expression that constructs a temporary.
8069 CurInit = S.BuildCXXConstructExpr(Loc, Step->Type,
8070 FoundFn, Constructor,
8071 ConstructorArgs,
8072 HadMultipleCandidates,
8073 /*ListInit*/ false,
8074 /*StdInitListInit*/ false,
8075 /*ZeroInit*/ false,
8076 CXXConstructExpr::CK_Complete,
8077 SourceRange());
8078 if (CurInit.isInvalid())
8079 return ExprError();
8080
8081 S.CheckConstructorAccess(Kind.getLocation(), Constructor, FoundFn,
8082 Entity);
8083 if (S.DiagnoseUseOfDecl(FoundFn, Kind.getLocation()))
8084 return ExprError();
8085
8086 CastKind = CK_ConstructorConversion;
8087 CreatedObject = true;
8088 } else {
8089 // Build a call to the conversion function.
8090 CXXConversionDecl *Conversion = cast<CXXConversionDecl>(Fn);
8091 S.CheckMemberOperatorAccess(Kind.getLocation(), CurInit.get(), nullptr,
8092 FoundFn);
8093 if (S.DiagnoseUseOfDecl(FoundFn, Kind.getLocation()))
8094 return ExprError();
8095
8096 CurInit = S.BuildCXXMemberCallExpr(CurInit.get(), FoundFn, Conversion,
8097 HadMultipleCandidates);
8098 if (CurInit.isInvalid())
8099 return ExprError();
8100
8101 CastKind = CK_UserDefinedConversion;
8102 CreatedObject = Conversion->getReturnType()->isRecordType();
8103 }
8104
8105 if (CreatedObject && checkAbstractType(CurInit.get()->getType()))
8106 return ExprError();
8107
8108 CurInit = ImplicitCastExpr::Create(S.Context, CurInit.get()->getType(),
8109 CastKind, CurInit.get(), nullptr,
8110 CurInit.get()->getValueKind());
8111
8112 if (shouldBindAsTemporary(Entity))
8113 // The overall entity is temporary, so this expression should be
8114 // destroyed at the end of its full-expression.
8115 CurInit = S.MaybeBindToTemporary(CurInit.getAs<Expr>());
8116 else if (CreatedObject && shouldDestroyEntity(Entity)) {
8117 // The object outlasts the full-expression, but we need to prepare for
8118 // a destructor being run on it.
8119 // FIXME: It makes no sense to do this here. This should happen
8120 // regardless of how we initialized the entity.
8121 QualType T = CurInit.get()->getType();
8122 if (const RecordType *Record = T->getAs<RecordType>()) {
8123 CXXDestructorDecl *Destructor
8124 = S.LookupDestructor(cast<CXXRecordDecl>(Record->getDecl()));
8125 S.CheckDestructorAccess(CurInit.get()->getBeginLoc(), Destructor,
8126 S.PDiag(diag::err_access_dtor_temp) << T);
8127 S.MarkFunctionReferenced(CurInit.get()->getBeginLoc(), Destructor);
8128 if (S.DiagnoseUseOfDecl(Destructor, CurInit.get()->getBeginLoc()))
8129 return ExprError();
8130 }
8131 }
8132 break;
8133 }
8134
8135 case SK_QualificationConversionLValue:
8136 case SK_QualificationConversionXValue:
8137 case SK_QualificationConversionRValue: {
8138 // Perform a qualification conversion; these can never go wrong.
8139 ExprValueKind VK =
8140 Step->Kind == SK_QualificationConversionLValue
8141 ? VK_LValue
8142 : (Step->Kind == SK_QualificationConversionXValue ? VK_XValue
8143 : VK_RValue);
8144 CurInit = S.PerformQualificationConversion(CurInit.get(), Step->Type, VK);
8145 break;
8146 }
8147
8148 case SK_AtomicConversion: {
8149 assert(CurInit.get()->isRValue() && "cannot convert glvalue to atomic")((CurInit.get()->isRValue() && "cannot convert glvalue to atomic"
) ? static_cast<void> (0) : __assert_fail ("CurInit.get()->isRValue() && \"cannot convert glvalue to atomic\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8149, __PRETTY_FUNCTION__))
;
8150 CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
8151 CK_NonAtomicToAtomic, VK_RValue);
8152 break;
8153 }
8154
8155 case SK_ConversionSequence:
8156 case SK_ConversionSequenceNoNarrowing: {
8157 if (const auto *FromPtrType =
8158 CurInit.get()->getType()->getAs<PointerType>()) {
8159 if (const auto *ToPtrType = Step->Type->getAs<PointerType>()) {
8160 if (FromPtrType->getPointeeType()->hasAttr(attr::NoDeref) &&
8161 !ToPtrType->getPointeeType()->hasAttr(attr::NoDeref)) {
8162 S.Diag(CurInit.get()->getExprLoc(),
8163 diag::warn_noderef_to_dereferenceable_pointer)
8164 << CurInit.get()->getSourceRange();
8165 }
8166 }
8167 }
8168
8169 Sema::CheckedConversionKind CCK
8170 = Kind.isCStyleCast()? Sema::CCK_CStyleCast
8171 : Kind.isFunctionalCast()? Sema::CCK_FunctionalCast
8172 : Kind.isExplicitCast()? Sema::CCK_OtherCast
8173 : Sema::CCK_ImplicitConversion;
8174 ExprResult CurInitExprRes =
8175 S.PerformImplicitConversion(CurInit.get(), Step->Type, *Step->ICS,
8176 getAssignmentAction(Entity), CCK);
8177 if (CurInitExprRes.isInvalid())
8178 return ExprError();
8179
8180 S.DiscardMisalignedMemberAddress(Step->Type.getTypePtr(), CurInit.get());
8181
8182 CurInit = CurInitExprRes;
8183
8184 if (Step->Kind == SK_ConversionSequenceNoNarrowing &&
8185 S.getLangOpts().CPlusPlus)
8186 DiagnoseNarrowingInInitList(S, *Step->ICS, SourceType, Entity.getType(),
8187 CurInit.get());
8188
8189 break;
8190 }
8191
8192 case SK_ListInitialization: {
8193 if (checkAbstractType(Step->Type))
8194 return ExprError();
8195
8196 InitListExpr *InitList = cast<InitListExpr>(CurInit.get());
8197 // If we're not initializing the top-level entity, we need to create an
8198 // InitializeTemporary entity for our target type.
8199 QualType Ty = Step->Type;
8200 bool IsTemporary = !S.Context.hasSameType(Entity.getType(), Ty);
8201 InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(Ty);
8202 InitializedEntity InitEntity = IsTemporary ? TempEntity : Entity;
8203 InitListChecker PerformInitList(S, InitEntity,
8204 InitList, Ty, /*VerifyOnly=*/false,
8205 /*TreatUnavailableAsInvalid=*/false);
8206 if (PerformInitList.HadError())
8207 return ExprError();
8208
8209 // Hack: We must update *ResultType if available in order to set the
8210 // bounds of arrays, e.g. in 'int ar[] = {1, 2, 3};'.
8211 // Worst case: 'const int (&arref)[] = {1, 2, 3};'.
8212 if (ResultType &&
8213 ResultType->getNonReferenceType()->isIncompleteArrayType()) {
8214 if ((*ResultType)->isRValueReferenceType())
8215 Ty = S.Context.getRValueReferenceType(Ty);
8216 else if ((*ResultType)->isLValueReferenceType())
8217 Ty = S.Context.getLValueReferenceType(Ty,
8218 (*ResultType)->castAs<LValueReferenceType>()->isSpelledAsLValue());
8219 *ResultType = Ty;
8220 }
8221
8222 InitListExpr *StructuredInitList =
8223 PerformInitList.getFullyStructuredList();
8224 CurInit.get();
8225 CurInit = shouldBindAsTemporary(InitEntity)
8226 ? S.MaybeBindToTemporary(StructuredInitList)
8227 : StructuredInitList;
8228 break;
8229 }
8230
8231 case SK_ConstructorInitializationFromList: {
8232 if (checkAbstractType(Step->Type))
8233 return ExprError();
8234
8235 // When an initializer list is passed for a parameter of type "reference
8236 // to object", we don't get an EK_Temporary entity, but instead an
8237 // EK_Parameter entity with reference type.
8238 // FIXME: This is a hack. What we really should do is create a user
8239 // conversion step for this case, but this makes it considerably more
8240 // complicated. For now, this will do.
8241 InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(
8242 Entity.getType().getNonReferenceType());
8243 bool UseTemporary = Entity.getType()->isReferenceType();
8244 assert(Args.size() == 1 && "expected a single argument for list init")((Args.size() == 1 && "expected a single argument for list init"
) ? static_cast<void> (0) : __assert_fail ("Args.size() == 1 && \"expected a single argument for list init\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8244, __PRETTY_FUNCTION__))
;
8245 InitListExpr *InitList = cast<InitListExpr>(Args[0]);
8246 S.Diag(InitList->getExprLoc(), diag::warn_cxx98_compat_ctor_list_init)
8247 << InitList->getSourceRange();
8248 MultiExprArg Arg(InitList->getInits(), InitList->getNumInits());
8249 CurInit = PerformConstructorInitialization(S, UseTemporary ? TempEntity :
8250 Entity,
8251 Kind, Arg, *Step,
8252 ConstructorInitRequiresZeroInit,
8253 /*IsListInitialization*/true,
8254 /*IsStdInitListInit*/false,
8255 InitList->getLBraceLoc(),
8256 InitList->getRBraceLoc());
8257 break;
8258 }
8259
8260 case SK_UnwrapInitList:
8261 CurInit = cast<InitListExpr>(CurInit.get())->getInit(0);
8262 break;
8263
8264 case SK_RewrapInitList: {
8265 Expr *E = CurInit.get();
8266 InitListExpr *Syntactic = Step->WrappingSyntacticList;
8267 InitListExpr *ILE = new (S.Context) InitListExpr(S.Context,
8268 Syntactic->getLBraceLoc(), E, Syntactic->getRBraceLoc());
8269 ILE->setSyntacticForm(Syntactic);
8270 ILE->setType(E->getType());
8271 ILE->setValueKind(E->getValueKind());
8272 CurInit = ILE;
8273 break;
8274 }
8275
8276 case SK_ConstructorInitialization:
8277 case SK_StdInitializerListConstructorCall: {
8278 if (checkAbstractType(Step->Type))
8279 return ExprError();
8280
8281 // When an initializer list is passed for a parameter of type "reference
8282 // to object", we don't get an EK_Temporary entity, but instead an
8283 // EK_Parameter entity with reference type.
8284 // FIXME: This is a hack. What we really should do is create a user
8285 // conversion step for this case, but this makes it considerably more
8286 // complicated. For now, this will do.
8287 InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(
8288 Entity.getType().getNonReferenceType());
8289 bool UseTemporary = Entity.getType()->isReferenceType();
8290 bool IsStdInitListInit =
8291 Step->Kind == SK_StdInitializerListConstructorCall;
8292 Expr *Source = CurInit.get();
8293 SourceRange Range = Kind.hasParenOrBraceRange()
8294 ? Kind.getParenOrBraceRange()
8295 : SourceRange();
8296 CurInit = PerformConstructorInitialization(
8297 S, UseTemporary ? TempEntity : Entity, Kind,
8298 Source ? MultiExprArg(Source) : Args, *Step,
8299 ConstructorInitRequiresZeroInit,
8300 /*IsListInitialization*/ IsStdInitListInit,
8301 /*IsStdInitListInitialization*/ IsStdInitListInit,
8302 /*LBraceLoc*/ Range.getBegin(),
8303 /*RBraceLoc*/ Range.getEnd());
8304 break;
8305 }
8306
8307 case SK_ZeroInitialization: {
8308 step_iterator NextStep = Step;
8309 ++NextStep;
8310 if (NextStep != StepEnd &&
8311 (NextStep->Kind == SK_ConstructorInitialization ||
8312 NextStep->Kind == SK_ConstructorInitializationFromList)) {
8313 // The need for zero-initialization is recorded directly into
8314 // the call to the object's constructor within the next step.
8315 ConstructorInitRequiresZeroInit = true;
8316 } else if (Kind.getKind() == InitializationKind::IK_Value &&
8317 S.getLangOpts().CPlusPlus &&
8318 !Kind.isImplicitValueInit()) {
8319 TypeSourceInfo *TSInfo = Entity.getTypeSourceInfo();
8320 if (!TSInfo)
8321 TSInfo = S.Context.getTrivialTypeSourceInfo(Step->Type,
8322 Kind.getRange().getBegin());
8323
8324 CurInit = new (S.Context) CXXScalarValueInitExpr(
8325 Entity.getType().getNonLValueExprType(S.Context), TSInfo,
8326 Kind.getRange().getEnd());
8327 } else {
8328 CurInit = new (S.Context) ImplicitValueInitExpr(Step->Type);
8329 }
8330 break;
8331 }
8332
8333 case SK_CAssignment: {
8334 QualType SourceType = CurInit.get()->getType();
8335
8336 // Save off the initial CurInit in case we need to emit a diagnostic
8337 ExprResult InitialCurInit = CurInit;
8338 ExprResult Result = CurInit;
8339 Sema::AssignConvertType ConvTy =
8340 S.CheckSingleAssignmentConstraints(Step->Type, Result, true,
8341 Entity.getKind() == InitializedEntity::EK_Parameter_CF_Audited);
8342 if (Result.isInvalid())
8343 return ExprError();
8344 CurInit = Result;
8345
8346 // If this is a call, allow conversion to a transparent union.
8347 ExprResult CurInitExprRes = CurInit;
8348 if (ConvTy != Sema::Compatible &&
8349 Entity.isParameterKind() &&
8350 S.CheckTransparentUnionArgumentConstraints(Step->Type, CurInitExprRes)
8351 == Sema::Compatible)
8352 ConvTy = Sema::Compatible;
8353 if (CurInitExprRes.isInvalid())
8354 return ExprError();
8355 CurInit = CurInitExprRes;
8356
8357 bool Complained;
8358 if (S.DiagnoseAssignmentResult(ConvTy, Kind.getLocation(),
8359 Step->Type, SourceType,
8360 InitialCurInit.get(),
8361 getAssignmentAction(Entity, true),
8362 &Complained)) {
8363 PrintInitLocationNote(S, Entity);
8364 return ExprError();
8365 } else if (Complained)
8366 PrintInitLocationNote(S, Entity);
8367 break;
8368 }
8369
8370 case SK_StringInit: {
8371 QualType Ty = Step->Type;
8372 CheckStringInit(CurInit.get(), ResultType ? *ResultType : Ty,
8373 S.Context.getAsArrayType(Ty), S);
8374 break;
8375 }
8376
8377 case SK_ObjCObjectConversion:
8378 CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
8379 CK_ObjCObjectLValueCast,
8380 CurInit.get()->getValueKind());
8381 break;
8382
8383 case SK_ArrayLoopIndex: {
8384 Expr *Cur = CurInit.get();
8385 Expr *BaseExpr = new (S.Context)
8386 OpaqueValueExpr(Cur->getExprLoc(), Cur->getType(),
8387 Cur->getValueKind(), Cur->getObjectKind(), Cur);
8388 Expr *IndexExpr =
8389 new (S.Context) ArrayInitIndexExpr(S.Context.getSizeType());
8390 CurInit = S.CreateBuiltinArraySubscriptExpr(
8391 BaseExpr, Kind.getLocation(), IndexExpr, Kind.getLocation());
8392 ArrayLoopCommonExprs.push_back(BaseExpr);
8393 break;
8394 }
8395
8396 case SK_ArrayLoopInit: {
8397 assert(!ArrayLoopCommonExprs.empty() &&((!ArrayLoopCommonExprs.empty() && "mismatched SK_ArrayLoopIndex and SK_ArrayLoopInit"
) ? static_cast<void> (0) : __assert_fail ("!ArrayLoopCommonExprs.empty() && \"mismatched SK_ArrayLoopIndex and SK_ArrayLoopInit\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8398, __PRETTY_FUNCTION__))
8398 "mismatched SK_ArrayLoopIndex and SK_ArrayLoopInit")((!ArrayLoopCommonExprs.empty() && "mismatched SK_ArrayLoopIndex and SK_ArrayLoopInit"
) ? static_cast<void> (0) : __assert_fail ("!ArrayLoopCommonExprs.empty() && \"mismatched SK_ArrayLoopIndex and SK_ArrayLoopInit\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8398, __PRETTY_FUNCTION__))
;
8399 Expr *Common = ArrayLoopCommonExprs.pop_back_val();
8400 CurInit = new (S.Context) ArrayInitLoopExpr(Step->Type, Common,
8401 CurInit.get());
8402 break;
8403 }
8404
8405 case SK_GNUArrayInit:
8406 // Okay: we checked everything before creating this step. Note that
8407 // this is a GNU extension.
8408 S.Diag(Kind.getLocation(), diag::ext_array_init_copy)
8409 << Step->Type << CurInit.get()->getType()
8410 << CurInit.get()->getSourceRange();
8411 updateGNUCompoundLiteralRValue(CurInit.get());
8412 LLVM_FALLTHROUGH[[gnu::fallthrough]];
8413 case SK_ArrayInit:
8414 // If the destination type is an incomplete array type, update the
8415 // type accordingly.
8416 if (ResultType) {
8417 if (const IncompleteArrayType *IncompleteDest
8418 = S.Context.getAsIncompleteArrayType(Step->Type)) {
8419 if (const ConstantArrayType *ConstantSource
8420 = S.Context.getAsConstantArrayType(CurInit.get()->getType())) {
8421 *ResultType = S.Context.getConstantArrayType(
8422 IncompleteDest->getElementType(),
8423 ConstantSource->getSize(),
8424 ConstantSource->getSizeExpr(),
8425 ArrayType::Normal, 0);
8426 }
8427 }
8428 }
8429 break;
8430
8431 case SK_ParenthesizedArrayInit:
8432 // Okay: we checked everything before creating this step. Note that
8433 // this is a GNU extension.
8434 S.Diag(Kind.getLocation(), diag::ext_array_init_parens)
8435 << CurInit.get()->getSourceRange();
8436 break;
8437
8438 case SK_PassByIndirectCopyRestore:
8439 case SK_PassByIndirectRestore:
8440 checkIndirectCopyRestoreSource(S, CurInit.get());
8441 CurInit = new (S.Context) ObjCIndirectCopyRestoreExpr(
8442 CurInit.get(), Step->Type,
8443 Step->Kind == SK_PassByIndirectCopyRestore);
8444 break;
8445
8446 case SK_ProduceObjCObject:
8447 CurInit =
8448 ImplicitCastExpr::Create(S.Context, Step->Type, CK_ARCProduceObject,
8449 CurInit.get(), nullptr, VK_RValue);
8450 break;
8451
8452 case SK_StdInitializerList: {
8453 S.Diag(CurInit.get()->getExprLoc(),
8454 diag::warn_cxx98_compat_initializer_list_init)
8455 << CurInit.get()->getSourceRange();
8456
8457 // Materialize the temporary into memory.
8458 MaterializeTemporaryExpr *MTE = S.CreateMaterializeTemporaryExpr(
8459 CurInit.get()->getType(), CurInit.get(),
8460 /*BoundToLvalueReference=*/false);
8461
8462 // Wrap it in a construction of a std::initializer_list<T>.
8463 CurInit = new (S.Context) CXXStdInitializerListExpr(Step->Type, MTE);
8464
8465 // Bind the result, in case the library has given initializer_list a
8466 // non-trivial destructor.
8467 if (shouldBindAsTemporary(Entity))
8468 CurInit = S.MaybeBindToTemporary(CurInit.get());
8469 break;
8470 }
8471
8472 case SK_OCLSamplerInit: {
8473 // Sampler initialization have 5 cases:
8474 // 1. function argument passing
8475 // 1a. argument is a file-scope variable
8476 // 1b. argument is a function-scope variable
8477 // 1c. argument is one of caller function's parameters
8478 // 2. variable initialization
8479 // 2a. initializing a file-scope variable
8480 // 2b. initializing a function-scope variable
8481 //
8482 // For file-scope variables, since they cannot be initialized by function
8483 // call of __translate_sampler_initializer in LLVM IR, their references
8484 // need to be replaced by a cast from their literal initializers to
8485 // sampler type. Since sampler variables can only be used in function
8486 // calls as arguments, we only need to replace them when handling the
8487 // argument passing.
8488 assert(Step->Type->isSamplerT() &&((Step->Type->isSamplerT() && "Sampler initialization on non-sampler type."
) ? static_cast<void> (0) : __assert_fail ("Step->Type->isSamplerT() && \"Sampler initialization on non-sampler type.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8489, __PRETTY_FUNCTION__))
8489 "Sampler initialization on non-sampler type.")((Step->Type->isSamplerT() && "Sampler initialization on non-sampler type."
) ? static_cast<void> (0) : __assert_fail ("Step->Type->isSamplerT() && \"Sampler initialization on non-sampler type.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8489, __PRETTY_FUNCTION__))
;
8490 Expr *Init = CurInit.get()->IgnoreParens();
8491 QualType SourceType = Init->getType();
8492 // Case 1
8493 if (Entity.isParameterKind()) {
8494 if (!SourceType->isSamplerT() && !SourceType->isIntegerType()) {
8495 S.Diag(Kind.getLocation(), diag::err_sampler_argument_required)
8496 << SourceType;
8497 break;
8498 } else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Init)) {
8499 auto Var = cast<VarDecl>(DRE->getDecl());
8500 // Case 1b and 1c
8501 // No cast from integer to sampler is needed.
8502 if (!Var->hasGlobalStorage()) {
8503 CurInit = ImplicitCastExpr::Create(S.Context, Step->Type,
8504 CK_LValueToRValue, Init,
8505 /*BasePath=*/nullptr, VK_RValue);
8506 break;
8507 }
8508 // Case 1a
8509 // For function call with a file-scope sampler variable as argument,
8510 // get the integer literal.
8511 // Do not diagnose if the file-scope variable does not have initializer
8512 // since this has already been diagnosed when parsing the variable
8513 // declaration.
8514 if (!Var->getInit() || !isa<ImplicitCastExpr>(Var->getInit()))
8515 break;
8516 Init = cast<ImplicitCastExpr>(const_cast<Expr*>(
8517 Var->getInit()))->getSubExpr();
8518 SourceType = Init->getType();
8519 }
8520 } else {
8521 // Case 2
8522 // Check initializer is 32 bit integer constant.
8523 // If the initializer is taken from global variable, do not diagnose since
8524 // this has already been done when parsing the variable declaration.
8525 if (!Init->isConstantInitializer(S.Context, false))
8526 break;
8527
8528 if (!SourceType->isIntegerType() ||
8529 32 != S.Context.getIntWidth(SourceType)) {
8530 S.Diag(Kind.getLocation(), diag::err_sampler_initializer_not_integer)
8531 << SourceType;
8532 break;
8533 }
8534
8535 Expr::EvalResult EVResult;
8536 Init->EvaluateAsInt(EVResult, S.Context);
8537 llvm::APSInt Result = EVResult.Val.getInt();
8538 const uint64_t SamplerValue = Result.getLimitedValue();
8539 // 32-bit value of sampler's initializer is interpreted as
8540 // bit-field with the following structure:
8541 // |unspecified|Filter|Addressing Mode| Normalized Coords|
8542 // |31 6|5 4|3 1| 0|
8543 // This structure corresponds to enum values of sampler properties
8544 // defined in SPIR spec v1.2 and also opencl-c.h
8545 unsigned AddressingMode = (0x0E & SamplerValue) >> 1;
8546 unsigned FilterMode = (0x30 & SamplerValue) >> 4;
8547 if (FilterMode != 1 && FilterMode != 2 &&
8548 !S.getOpenCLOptions().isEnabled(
8549 "cl_intel_device_side_avc_motion_estimation"))
8550 S.Diag(Kind.getLocation(),
8551 diag::warn_sampler_initializer_invalid_bits)
8552 << "Filter Mode";
8553 if (AddressingMode > 4)
8554 S.Diag(Kind.getLocation(),
8555 diag::warn_sampler_initializer_invalid_bits)
8556 << "Addressing Mode";
8557 }
8558
8559 // Cases 1a, 2a and 2b
8560 // Insert cast from integer to sampler.
8561 CurInit = S.ImpCastExprToType(Init, S.Context.OCLSamplerTy,
8562 CK_IntToOCLSampler);
8563 break;
8564 }
8565 case SK_OCLZeroOpaqueType: {
8566 assert((Step->Type->isEventT() || Step->Type->isQueueT() ||(((Step->Type->isEventT() || Step->Type->isQueueT
() || Step->Type->isOCLIntelSubgroupAVCType()) &&
"Wrong type for initialization of OpenCL opaque type.") ? static_cast
<void> (0) : __assert_fail ("(Step->Type->isEventT() || Step->Type->isQueueT() || Step->Type->isOCLIntelSubgroupAVCType()) && \"Wrong type for initialization of OpenCL opaque type.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8568, __PRETTY_FUNCTION__))
8567 Step->Type->isOCLIntelSubgroupAVCType()) &&(((Step->Type->isEventT() || Step->Type->isQueueT
() || Step->Type->isOCLIntelSubgroupAVCType()) &&
"Wrong type for initialization of OpenCL opaque type.") ? static_cast
<void> (0) : __assert_fail ("(Step->Type->isEventT() || Step->Type->isQueueT() || Step->Type->isOCLIntelSubgroupAVCType()) && \"Wrong type for initialization of OpenCL opaque type.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8568, __PRETTY_FUNCTION__))
8568 "Wrong type for initialization of OpenCL opaque type.")(((Step->Type->isEventT() || Step->Type->isQueueT
() || Step->Type->isOCLIntelSubgroupAVCType()) &&
"Wrong type for initialization of OpenCL opaque type.") ? static_cast
<void> (0) : __assert_fail ("(Step->Type->isEventT() || Step->Type->isQueueT() || Step->Type->isOCLIntelSubgroupAVCType()) && \"Wrong type for initialization of OpenCL opaque type.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8568, __PRETTY_FUNCTION__))
;
8569
8570 CurInit = S.ImpCastExprToType(CurInit.get(), Step->Type,
8571 CK_ZeroToOCLOpaqueType,
8572 CurInit.get()->getValueKind());
8573 break;
8574 }
8575 }
8576 }
8577
8578 // Check whether the initializer has a shorter lifetime than the initialized
8579 // entity, and if not, either lifetime-extend or warn as appropriate.
8580 if (auto *Init = CurInit.get())
8581 S.checkInitializerLifetime(Entity, Init);
8582
8583 // Diagnose non-fatal problems with the completed initialization.
8584 if (Entity.getKind() == InitializedEntity::EK_Member &&
8585 cast<FieldDecl>(Entity.getDecl())->isBitField())
8586 S.CheckBitFieldInitialization(Kind.getLocation(),
8587 cast<FieldDecl>(Entity.getDecl()),
8588 CurInit.get());
8589
8590 // Check for std::move on construction.
8591 if (const Expr *E = CurInit.get()) {
8592 CheckMoveOnConstruction(S, E,
8593 Entity.getKind() == InitializedEntity::EK_Result);
8594 }
8595
8596 return CurInit;
8597}
8598
8599/// Somewhere within T there is an uninitialized reference subobject.
8600/// Dig it out and diagnose it.
8601static bool DiagnoseUninitializedReference(Sema &S, SourceLocation Loc,
8602 QualType T) {
8603 if (T->isReferenceType()) {
8604 S.Diag(Loc, diag::err_reference_without_init)
8605 << T.getNonReferenceType();
8606 return true;
8607 }
8608
8609 CXXRecordDecl *RD = T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
8610 if (!RD || !RD->hasUninitializedReferenceMember())
8611 return false;
8612
8613 for (const auto *FI : RD->fields()) {
8614 if (FI->isUnnamedBitfield())
8615 continue;
8616
8617 if (DiagnoseUninitializedReference(S, FI->getLocation(), FI->getType())) {
8618 S.Diag(Loc, diag::note_value_initialization_here) << RD;
8619 return true;
8620 }
8621 }
8622
8623 for (const auto &BI : RD->bases()) {
8624 if (DiagnoseUninitializedReference(S, BI.getBeginLoc(), BI.getType())) {
8625 S.Diag(Loc, diag::note_value_initialization_here) << RD;
8626 return true;
8627 }
8628 }
8629
8630 return false;
8631}
8632
8633
8634//===----------------------------------------------------------------------===//
8635// Diagnose initialization failures
8636//===----------------------------------------------------------------------===//
8637
8638/// Emit notes associated with an initialization that failed due to a
8639/// "simple" conversion failure.
8640static void emitBadConversionNotes(Sema &S, const InitializedEntity &entity,
8641 Expr *op) {
8642 QualType destType = entity.getType();
8643 if (destType.getNonReferenceType()->isObjCObjectPointerType() &&
8644 op->getType()->isObjCObjectPointerType()) {
8645
8646 // Emit a possible note about the conversion failing because the
8647 // operand is a message send with a related result type.
8648 S.EmitRelatedResultTypeNote(op);
8649
8650 // Emit a possible note about a return failing because we're
8651 // expecting a related result type.
8652 if (entity.getKind() == InitializedEntity::EK_Result)
8653 S.EmitRelatedResultTypeNoteForReturn(destType);
8654 }
8655}
8656
8657static void diagnoseListInit(Sema &S, const InitializedEntity &Entity,
8658 InitListExpr *InitList) {
8659 QualType DestType = Entity.getType();
8660
8661 QualType E;
8662 if (S.getLangOpts().CPlusPlus11 && S.isStdInitializerList(DestType, &E)) {
8663 QualType ArrayType = S.Context.getConstantArrayType(
8664 E.withConst(),
8665 llvm::APInt(S.Context.getTypeSize(S.Context.getSizeType()),
8666 InitList->getNumInits()),
8667 nullptr, clang::ArrayType::Normal, 0);
8668 InitializedEntity HiddenArray =
8669 InitializedEntity::InitializeTemporary(ArrayType);
8670 return diagnoseListInit(S, HiddenArray, InitList);
8671 }
8672
8673 if (DestType->isReferenceType()) {
8674 // A list-initialization failure for a reference means that we tried to
8675 // create a temporary of the inner type (per [dcl.init.list]p3.6) and the
8676 // inner initialization failed.
8677 QualType T = DestType->castAs<ReferenceType>()->getPointeeType();
8678 diagnoseListInit(S, InitializedEntity::InitializeTemporary(T), InitList);
8679 SourceLocation Loc = InitList->getBeginLoc();
8680 if (auto *D = Entity.getDecl())
8681 Loc = D->getLocation();
8682 S.Diag(Loc, diag::note_in_reference_temporary_list_initializer) << T;
8683 return;
8684 }
8685
8686 InitListChecker DiagnoseInitList(S, Entity, InitList, DestType,
8687 /*VerifyOnly=*/false,
8688 /*TreatUnavailableAsInvalid=*/false);
8689 assert(DiagnoseInitList.HadError() &&((DiagnoseInitList.HadError() && "Inconsistent init list check result."
) ? static_cast<void> (0) : __assert_fail ("DiagnoseInitList.HadError() && \"Inconsistent init list check result.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8690, __PRETTY_FUNCTION__))
8690 "Inconsistent init list check result.")((DiagnoseInitList.HadError() && "Inconsistent init list check result."
) ? static_cast<void> (0) : __assert_fail ("DiagnoseInitList.HadError() && \"Inconsistent init list check result.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8690, __PRETTY_FUNCTION__))
;
8691}
8692
8693bool InitializationSequence::Diagnose(Sema &S,
8694 const InitializedEntity &Entity,
8695 const InitializationKind &Kind,
8696 ArrayRef<Expr *> Args) {
8697 if (!Failed())
8698 return false;
8699
8700 // When we want to diagnose only one element of a braced-init-list,
8701 // we need to factor it out.
8702 Expr *OnlyArg;
8703 if (Args.size() == 1) {
8704 auto *List = dyn_cast<InitListExpr>(Args[0]);
8705 if (List && List->getNumInits() == 1)
8706 OnlyArg = List->getInit(0);
8707 else
8708 OnlyArg = Args[0];
8709 }
8710 else
8711 OnlyArg = nullptr;
8712
8713 QualType DestType = Entity.getType();
8714 switch (Failure) {
8715 case FK_TooManyInitsForReference:
8716 // FIXME: Customize for the initialized entity?
8717 if (Args.empty()) {
8718 // Dig out the reference subobject which is uninitialized and diagnose it.
8719 // If this is value-initialization, this could be nested some way within
8720 // the target type.
8721 assert(Kind.getKind() == InitializationKind::IK_Value ||((Kind.getKind() == InitializationKind::IK_Value || DestType->
isReferenceType()) ? static_cast<void> (0) : __assert_fail
("Kind.getKind() == InitializationKind::IK_Value || DestType->isReferenceType()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8722, __PRETTY_FUNCTION__))
8722 DestType->isReferenceType())((Kind.getKind() == InitializationKind::IK_Value || DestType->
isReferenceType()) ? static_cast<void> (0) : __assert_fail
("Kind.getKind() == InitializationKind::IK_Value || DestType->isReferenceType()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8722, __PRETTY_FUNCTION__))
;
8723 bool Diagnosed =
8724 DiagnoseUninitializedReference(S, Kind.getLocation(), DestType);
8725 assert(Diagnosed && "couldn't find uninitialized reference to diagnose")((Diagnosed && "couldn't find uninitialized reference to diagnose"
) ? static_cast<void> (0) : __assert_fail ("Diagnosed && \"couldn't find uninitialized reference to diagnose\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8725, __PRETTY_FUNCTION__))
;
8726 (void)Diagnosed;
8727 } else // FIXME: diagnostic below could be better!
8728 S.Diag(Kind.getLocation(), diag::err_reference_has_multiple_inits)
8729 << SourceRange(Args.front()->getBeginLoc(), Args.back()->getEndLoc());
8730 break;
8731 case FK_ParenthesizedListInitForReference:
8732 S.Diag(Kind.getLocation(), diag::err_list_init_in_parens)
8733 << 1 << Entity.getType() << Args[0]->getSourceRange();
8734 break;
8735
8736 case FK_ArrayNeedsInitList:
8737 S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 0;
8738 break;
8739 case FK_ArrayNeedsInitListOrStringLiteral:
8740 S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 1;
8741 break;
8742 case FK_ArrayNeedsInitListOrWideStringLiteral:
8743 S.Diag(Kind.getLocation(), diag::err_array_init_not_init_list) << 2;
8744 break;
8745 case FK_NarrowStringIntoWideCharArray:
8746 S.Diag(Kind.getLocation(), diag::err_array_init_narrow_string_into_wchar);
8747 break;
8748 case FK_WideStringIntoCharArray:
8749 S.Diag(Kind.getLocation(), diag::err_array_init_wide_string_into_char);
8750 break;
8751 case FK_IncompatWideStringIntoWideChar:
8752 S.Diag(Kind.getLocation(),
8753 diag::err_array_init_incompat_wide_string_into_wchar);
8754 break;
8755 case FK_PlainStringIntoUTF8Char:
8756 S.Diag(Kind.getLocation(),
8757 diag::err_array_init_plain_string_into_char8_t);
8758 S.Diag(Args.front()->getBeginLoc(),
8759 diag::note_array_init_plain_string_into_char8_t)
8760 << FixItHint::CreateInsertion(Args.front()->getBeginLoc(), "u8");
8761 break;
8762 case FK_UTF8StringIntoPlainChar:
8763 S.Diag(Kind.getLocation(),
8764 diag::err_array_init_utf8_string_into_char)
8765 << S.getLangOpts().CPlusPlus2a;
8766 break;
8767 case FK_ArrayTypeMismatch:
8768 case FK_NonConstantArrayInit:
8769 S.Diag(Kind.getLocation(),
8770 (Failure == FK_ArrayTypeMismatch
8771 ? diag::err_array_init_different_type
8772 : diag::err_array_init_non_constant_array))
8773 << DestType.getNonReferenceType()
8774 << OnlyArg->getType()
8775 << Args[0]->getSourceRange();
8776 break;
8777
8778 case FK_VariableLengthArrayHasInitializer:
8779 S.Diag(Kind.getLocation(), diag::err_variable_object_no_init)
8780 << Args[0]->getSourceRange();
8781 break;
8782
8783 case FK_AddressOfOverloadFailed: {
8784 DeclAccessPair Found;
8785 S.ResolveAddressOfOverloadedFunction(OnlyArg,
8786 DestType.getNonReferenceType(),
8787 true,
8788 Found);
8789 break;
8790 }
8791
8792 case FK_AddressOfUnaddressableFunction: {
8793 auto *FD = cast<FunctionDecl>(cast<DeclRefExpr>(OnlyArg)->getDecl());
8794 S.checkAddressOfFunctionIsAvailable(FD, /*Complain=*/true,
8795 OnlyArg->getBeginLoc());
8796 break;
8797 }
8798
8799 case FK_ReferenceInitOverloadFailed:
8800 case FK_UserConversionOverloadFailed:
8801 switch (FailedOverloadResult) {
8802 case OR_Ambiguous:
8803
8804 FailedCandidateSet.NoteCandidates(
8805 PartialDiagnosticAt(
8806 Kind.getLocation(),
8807 Failure == FK_UserConversionOverloadFailed
8808 ? (S.PDiag(diag::err_typecheck_ambiguous_condition)
8809 << OnlyArg->getType() << DestType
8810 << Args[0]->getSourceRange())
8811 : (S.PDiag(diag::err_ref_init_ambiguous)
8812 << DestType << OnlyArg->getType()
8813 << Args[0]->getSourceRange())),
8814 S, OCD_AmbiguousCandidates, Args);
8815 break;
8816
8817 case OR_No_Viable_Function: {
8818 auto Cands = FailedCandidateSet.CompleteCandidates(S, OCD_AllCandidates, Args);
8819 if (!S.RequireCompleteType(Kind.getLocation(),
8820 DestType.getNonReferenceType(),
8821 diag::err_typecheck_nonviable_condition_incomplete,
8822 OnlyArg->getType(), Args[0]->getSourceRange()))
8823 S.Diag(Kind.getLocation(), diag::err_typecheck_nonviable_condition)
8824 << (Entity.getKind() == InitializedEntity::EK_Result)
8825 << OnlyArg->getType() << Args[0]->getSourceRange()
8826 << DestType.getNonReferenceType();
8827
8828 FailedCandidateSet.NoteCandidates(S, Args, Cands);
8829 break;
8830 }
8831 case OR_Deleted: {
8832 S.Diag(Kind.getLocation(), diag::err_typecheck_deleted_function)
8833 << OnlyArg->getType() << DestType.getNonReferenceType()
8834 << Args[0]->getSourceRange();
8835 OverloadCandidateSet::iterator Best;
8836 OverloadingResult Ovl
8837 = FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best);
8838 if (Ovl == OR_Deleted) {
8839 S.NoteDeletedFunction(Best->Function);
8840 } else {
8841 llvm_unreachable("Inconsistent overload resolution?")::llvm::llvm_unreachable_internal("Inconsistent overload resolution?"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8841)
;
8842 }
8843 break;
8844 }
8845
8846 case OR_Success:
8847 llvm_unreachable("Conversion did not fail!")::llvm::llvm_unreachable_internal("Conversion did not fail!",
"/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8847)
;
8848 }
8849 break;
8850
8851 case FK_NonConstLValueReferenceBindingToTemporary:
8852 if (isa<InitListExpr>(Args[0])) {
8853 S.Diag(Kind.getLocation(),
8854 diag::err_lvalue_reference_bind_to_initlist)
8855 << DestType.getNonReferenceType().isVolatileQualified()
8856 << DestType.getNonReferenceType()
8857 << Args[0]->getSourceRange();
8858 break;
8859 }
8860 LLVM_FALLTHROUGH[[gnu::fallthrough]];
8861
8862 case FK_NonConstLValueReferenceBindingToUnrelated:
8863 S.Diag(Kind.getLocation(),
8864 Failure == FK_NonConstLValueReferenceBindingToTemporary
8865 ? diag::err_lvalue_reference_bind_to_temporary
8866 : diag::err_lvalue_reference_bind_to_unrelated)
8867 << DestType.getNonReferenceType().isVolatileQualified()
8868 << DestType.getNonReferenceType()
8869 << OnlyArg->getType()
8870 << Args[0]->getSourceRange();
8871 break;
8872
8873 case FK_NonConstLValueReferenceBindingToBitfield: {
8874 // We don't necessarily have an unambiguous source bit-field.
8875 FieldDecl *BitField = Args[0]->getSourceBitField();
8876 S.Diag(Kind.getLocation(), diag::err_reference_bind_to_bitfield)
8877 << DestType.isVolatileQualified()
8878 << (BitField ? BitField->getDeclName() : DeclarationName())
8879 << (BitField != nullptr)
8880 << Args[0]->getSourceRange();
8881 if (BitField)
8882 S.Diag(BitField->getLocation(), diag::note_bitfield_decl);
8883 break;
8884 }
8885
8886 case FK_NonConstLValueReferenceBindingToVectorElement:
8887 S.Diag(Kind.getLocation(), diag::err_reference_bind_to_vector_element)
8888 << DestType.isVolatileQualified()
8889 << Args[0]->getSourceRange();
8890 break;
8891
8892 case FK_RValueReferenceBindingToLValue:
8893 S.Diag(Kind.getLocation(), diag::err_lvalue_to_rvalue_ref)
8894 << DestType.getNonReferenceType() << OnlyArg->getType()
8895 << Args[0]->getSourceRange();
8896 break;
8897
8898 case FK_ReferenceAddrspaceMismatchTemporary:
8899 S.Diag(Kind.getLocation(), diag::err_reference_bind_temporary_addrspace)
8900 << DestType << Args[0]->getSourceRange();
8901 break;
8902
8903 case FK_ReferenceInitDropsQualifiers: {
8904 QualType SourceType = OnlyArg->getType();
8905 QualType NonRefType = DestType.getNonReferenceType();
8906 Qualifiers DroppedQualifiers =
8907 SourceType.getQualifiers() - NonRefType.getQualifiers();
8908
8909 if (!NonRefType.getQualifiers().isAddressSpaceSupersetOf(
8910 SourceType.getQualifiers()))
8911 S.Diag(Kind.getLocation(), diag::err_reference_bind_drops_quals)
8912 << NonRefType << SourceType << 1 /*addr space*/
8913 << Args[0]->getSourceRange();
8914 else if (DroppedQualifiers.hasQualifiers())
8915 S.Diag(Kind.getLocation(), diag::err_reference_bind_drops_quals)
8916 << NonRefType << SourceType << 0 /*cv quals*/
8917 << Qualifiers::fromCVRMask(DroppedQualifiers.getCVRQualifiers())
8918 << DroppedQualifiers.getCVRQualifiers() << Args[0]->getSourceRange();
8919 else
8920 // FIXME: Consider decomposing the type and explaining which qualifiers
8921 // were dropped where, or on which level a 'const' is missing, etc.
8922 S.Diag(Kind.getLocation(), diag::err_reference_bind_drops_quals)
8923 << NonRefType << SourceType << 2 /*incompatible quals*/
8924 << Args[0]->getSourceRange();
8925 break;
8926 }
8927
8928 case FK_ReferenceInitFailed:
8929 S.Diag(Kind.getLocation(), diag::err_reference_bind_failed)
8930 << DestType.getNonReferenceType()
8931 << DestType.getNonReferenceType()->isIncompleteType()
8932 << OnlyArg->isLValue()
8933 << OnlyArg->getType()
8934 << Args[0]->getSourceRange();
8935 emitBadConversionNotes(S, Entity, Args[0]);
8936 break;
8937
8938 case FK_ConversionFailed: {
8939 QualType FromType = OnlyArg->getType();
8940 PartialDiagnostic PDiag = S.PDiag(diag::err_init_conversion_failed)
8941 << (int)Entity.getKind()
8942 << DestType
8943 << OnlyArg->isLValue()
8944 << FromType
8945 << Args[0]->getSourceRange();
8946 S.HandleFunctionTypeMismatch(PDiag, FromType, DestType);
8947 S.Diag(Kind.getLocation(), PDiag);
8948 emitBadConversionNotes(S, Entity, Args[0]);
8949 break;
8950 }
8951
8952 case FK_ConversionFromPropertyFailed:
8953 // No-op. This error has already been reported.
8954 break;
8955
8956 case FK_TooManyInitsForScalar: {
8957 SourceRange R;
8958
8959 auto *InitList = dyn_cast<InitListExpr>(Args[0]);
8960 if (InitList && InitList->getNumInits() >= 1) {
8961 R = SourceRange(InitList->getInit(0)->getEndLoc(), InitList->getEndLoc());
8962 } else {
8963 assert(Args.size() > 1 && "Expected multiple initializers!")((Args.size() > 1 && "Expected multiple initializers!"
) ? static_cast<void> (0) : __assert_fail ("Args.size() > 1 && \"Expected multiple initializers!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 8963, __PRETTY_FUNCTION__))
;
8964 R = SourceRange(Args.front()->getEndLoc(), Args.back()->getEndLoc());
8965 }
8966
8967 R.setBegin(S.getLocForEndOfToken(R.getBegin()));
8968 if (Kind.isCStyleOrFunctionalCast())
8969 S.Diag(Kind.getLocation(), diag::err_builtin_func_cast_more_than_one_arg)
8970 << R;
8971 else
8972 S.Diag(Kind.getLocation(), diag::err_excess_initializers)
8973 << /*scalar=*/2 << R;
8974 break;
8975 }
8976
8977 case FK_ParenthesizedListInitForScalar:
8978 S.Diag(Kind.getLocation(), diag::err_list_init_in_parens)
8979 << 0 << Entity.getType() << Args[0]->getSourceRange();
8980 break;
8981
8982 case FK_ReferenceBindingToInitList:
8983 S.Diag(Kind.getLocation(), diag::err_reference_bind_init_list)
8984 << DestType.getNonReferenceType() << Args[0]->getSourceRange();
8985 break;
8986
8987 case FK_InitListBadDestinationType:
8988 S.Diag(Kind.getLocation(), diag::err_init_list_bad_dest_type)
8989 << (DestType->isRecordType()) << DestType << Args[0]->getSourceRange();
8990 break;
8991
8992 case FK_ListConstructorOverloadFailed:
8993 case FK_ConstructorOverloadFailed: {
8994 SourceRange ArgsRange;
8995 if (Args.size())
8996 ArgsRange =
8997 SourceRange(Args.front()->getBeginLoc(), Args.back()->getEndLoc());
8998
8999 if (Failure == FK_ListConstructorOverloadFailed) {
9000 assert(Args.size() == 1 &&((Args.size() == 1 && "List construction from other than 1 argument."
) ? static_cast<void> (0) : __assert_fail ("Args.size() == 1 && \"List construction from other than 1 argument.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 9001, __PRETTY_FUNCTION__))
9001 "List construction from other than 1 argument.")((Args.size() == 1 && "List construction from other than 1 argument."
) ? static_cast<void> (0) : __assert_fail ("Args.size() == 1 && \"List construction from other than 1 argument.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 9001, __PRETTY_FUNCTION__))
;
9002 InitListExpr *InitList = cast<InitListExpr>(Args[0]);
9003 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits());
9004 }
9005
9006 // FIXME: Using "DestType" for the entity we're printing is probably
9007 // bad.
9008 switch (FailedOverloadResult) {
9009 case OR_Ambiguous:
9010 FailedCandidateSet.NoteCandidates(
9011 PartialDiagnosticAt(Kind.getLocation(),
9012 S.PDiag(diag::err_ovl_ambiguous_init)
9013 << DestType << ArgsRange),
9014 S, OCD_AmbiguousCandidates, Args);
9015 break;
9016
9017 case OR_No_Viable_Function:
9018 if (Kind.getKind() == InitializationKind::IK_Default &&
9019 (Entity.getKind() == InitializedEntity::EK_Base ||
9020 Entity.getKind() == InitializedEntity::EK_Member) &&
9021 isa<CXXConstructorDecl>(S.CurContext)) {
9022 // This is implicit default initialization of a member or
9023 // base within a constructor. If no viable function was
9024 // found, notify the user that they need to explicitly
9025 // initialize this base/member.
9026 CXXConstructorDecl *Constructor
9027 = cast<CXXConstructorDecl>(S.CurContext);
9028 const CXXRecordDecl *InheritedFrom = nullptr;
9029 if (auto Inherited = Constructor->getInheritedConstructor())
9030 InheritedFrom = Inherited.getShadowDecl()->getNominatedBaseClass();
9031 if (Entity.getKind() == InitializedEntity::EK_Base) {
9032 S.Diag(Kind.getLocation(), diag::err_missing_default_ctor)
9033 << (InheritedFrom ? 2 : Constructor->isImplicit() ? 1 : 0)
9034 << S.Context.getTypeDeclType(Constructor->getParent())
9035 << /*base=*/0
9036 << Entity.getType()
9037 << InheritedFrom;
9038
9039 RecordDecl *BaseDecl
9040 = Entity.getBaseSpecifier()->getType()->castAs<RecordType>()
9041 ->getDecl();
9042 S.Diag(BaseDecl->getLocation(), diag::note_previous_decl)
9043 << S.Context.getTagDeclType(BaseDecl);
9044 } else {
9045 S.Diag(Kind.getLocation(), diag::err_missing_default_ctor)
9046 << (InheritedFrom ? 2 : Constructor->isImplicit() ? 1 : 0)
9047 << S.Context.getTypeDeclType(Constructor->getParent())
9048 << /*member=*/1
9049 << Entity.getName()
9050 << InheritedFrom;
9051 S.Diag(Entity.getDecl()->getLocation(),
9052 diag::note_member_declared_at);
9053
9054 if (const RecordType *Record
9055 = Entity.getType()->getAs<RecordType>())
9056 S.Diag(Record->getDecl()->getLocation(),
9057 diag::note_previous_decl)
9058 << S.Context.getTagDeclType(Record->getDecl());
9059 }
9060 break;
9061 }
9062
9063 FailedCandidateSet.NoteCandidates(
9064 PartialDiagnosticAt(
9065 Kind.getLocation(),
9066 S.PDiag(diag::err_ovl_no_viable_function_in_init)
9067 << DestType << ArgsRange),
9068 S, OCD_AllCandidates, Args);
9069 break;
9070
9071 case OR_Deleted: {
9072 OverloadCandidateSet::iterator Best;
9073 OverloadingResult Ovl
9074 = FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best);
9075 if (Ovl != OR_Deleted) {
9076 S.Diag(Kind.getLocation(), diag::err_ovl_deleted_init)
9077 << DestType << ArgsRange;
9078 llvm_unreachable("Inconsistent overload resolution?")::llvm::llvm_unreachable_internal("Inconsistent overload resolution?"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 9078)
;
9079 break;
9080 }
9081
9082 // If this is a defaulted or implicitly-declared function, then
9083 // it was implicitly deleted. Make it clear that the deletion was
9084 // implicit.
9085 if (S.isImplicitlyDeleted(Best->Function))
9086 S.Diag(Kind.getLocation(), diag::err_ovl_deleted_special_init)
9087 << S.getSpecialMember(cast<CXXMethodDecl>(Best->Function))
9088 << DestType << ArgsRange;
9089 else
9090 S.Diag(Kind.getLocation(), diag::err_ovl_deleted_init)
9091 << DestType << ArgsRange;
9092
9093 S.NoteDeletedFunction(Best->Function);
9094 break;
9095 }
9096
9097 case OR_Success:
9098 llvm_unreachable("Conversion did not fail!")::llvm::llvm_unreachable_internal("Conversion did not fail!",
"/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 9098)
;
9099 }
9100 }
9101 break;
9102
9103 case FK_DefaultInitOfConst:
9104 if (Entity.getKind() == InitializedEntity::EK_Member &&
9105 isa<CXXConstructorDecl>(S.CurContext)) {
9106 // This is implicit default-initialization of a const member in
9107 // a constructor. Complain that it needs to be explicitly
9108 // initialized.
9109 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(S.CurContext);
9110 S.Diag(Kind.getLocation(), diag::err_uninitialized_member_in_ctor)
9111 << (Constructor->getInheritedConstructor() ? 2 :
9112 Constructor->isImplicit() ? 1 : 0)
9113 << S.Context.getTypeDeclType(Constructor->getParent())
9114 << /*const=*/1
9115 << Entity.getName();
9116 S.Diag(Entity.getDecl()->getLocation(), diag::note_previous_decl)
9117 << Entity.getName();
9118 } else {
9119 S.Diag(Kind.getLocation(), diag::err_default_init_const)
9120 << DestType << (bool)DestType->getAs<RecordType>();
9121 }
9122 break;
9123
9124 case FK_Incomplete:
9125 S.RequireCompleteType(Kind.getLocation(), FailedIncompleteType,
9126 diag::err_init_incomplete_type);
9127 break;
9128
9129 case FK_ListInitializationFailed: {
9130 // Run the init list checker again to emit diagnostics.
9131 InitListExpr *InitList = cast<InitListExpr>(Args[0]);
9132 diagnoseListInit(S, Entity, InitList);
9133 break;
9134 }
9135
9136 case FK_PlaceholderType: {
9137 // FIXME: Already diagnosed!
9138 break;
9139 }
9140
9141 case FK_ExplicitConstructor: {
9142 S.Diag(Kind.getLocation(), diag::err_selected_explicit_constructor)
9143 << Args[0]->getSourceRange();
9144 OverloadCandidateSet::iterator Best;
9145 OverloadingResult Ovl
9146 = FailedCandidateSet.BestViableFunction(S, Kind.getLocation(), Best);
9147 (void)Ovl;
9148 assert(Ovl == OR_Success && "Inconsistent overload resolution")((Ovl == OR_Success && "Inconsistent overload resolution"
) ? static_cast<void> (0) : __assert_fail ("Ovl == OR_Success && \"Inconsistent overload resolution\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 9148, __PRETTY_FUNCTION__))
;
9149 CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function);
9150 S.Diag(CtorDecl->getLocation(),
9151 diag::note_explicit_ctor_deduction_guide_here) << false;
9152 break;
9153 }
9154 }
9155
9156 PrintInitLocationNote(S, Entity);
9157 return true;
9158}
9159
9160void InitializationSequence::dump(raw_ostream &OS) const {
9161 switch (SequenceKind) {
9162 case FailedSequence: {
9163 OS << "Failed sequence: ";
9164 switch (Failure) {
9165 case FK_TooManyInitsForReference:
9166 OS << "too many initializers for reference";
9167 break;
9168
9169 case FK_ParenthesizedListInitForReference:
9170 OS << "parenthesized list init for reference";
9171 break;
9172
9173 case FK_ArrayNeedsInitList:
9174 OS << "array requires initializer list";
9175 break;
9176
9177 case FK_AddressOfUnaddressableFunction:
9178 OS << "address of unaddressable function was taken";
9179 break;
9180
9181 case FK_ArrayNeedsInitListOrStringLiteral:
9182 OS << "array requires initializer list or string literal";
9183 break;
9184
9185 case FK_ArrayNeedsInitListOrWideStringLiteral:
9186 OS << "array requires initializer list or wide string literal";
9187 break;
9188
9189 case FK_NarrowStringIntoWideCharArray:
9190 OS << "narrow string into wide char array";
9191 break;
9192
9193 case FK_WideStringIntoCharArray:
9194 OS << "wide string into char array";
9195 break;
9196
9197 case FK_IncompatWideStringIntoWideChar:
9198 OS << "incompatible wide string into wide char array";
9199 break;
9200
9201 case FK_PlainStringIntoUTF8Char:
9202 OS << "plain string literal into char8_t array";
9203 break;
9204
9205 case FK_UTF8StringIntoPlainChar:
9206 OS << "u8 string literal into char array";
9207 break;
9208
9209 case FK_ArrayTypeMismatch:
9210 OS << "array type mismatch";
9211 break;
9212
9213 case FK_NonConstantArrayInit:
9214 OS << "non-constant array initializer";
9215 break;
9216
9217 case FK_AddressOfOverloadFailed:
9218 OS << "address of overloaded function failed";
9219 break;
9220
9221 case FK_ReferenceInitOverloadFailed:
9222 OS << "overload resolution for reference initialization failed";
9223 break;
9224
9225 case FK_NonConstLValueReferenceBindingToTemporary:
9226 OS << "non-const lvalue reference bound to temporary";
9227 break;
9228
9229 case FK_NonConstLValueReferenceBindingToBitfield:
9230 OS << "non-const lvalue reference bound to bit-field";
9231 break;
9232
9233 case FK_NonConstLValueReferenceBindingToVectorElement:
9234 OS << "non-const lvalue reference bound to vector element";
9235 break;
9236
9237 case FK_NonConstLValueReferenceBindingToUnrelated:
9238 OS << "non-const lvalue reference bound to unrelated type";
9239 break;
9240
9241 case FK_RValueReferenceBindingToLValue:
9242 OS << "rvalue reference bound to an lvalue";
9243 break;
9244
9245 case FK_ReferenceInitDropsQualifiers:
9246 OS << "reference initialization drops qualifiers";
9247 break;
9248
9249 case FK_ReferenceAddrspaceMismatchTemporary:
9250 OS << "reference with mismatching address space bound to temporary";
9251 break;
9252
9253 case FK_ReferenceInitFailed:
9254 OS << "reference initialization failed";
9255 break;
9256
9257 case FK_ConversionFailed:
9258 OS << "conversion failed";
9259 break;
9260
9261 case FK_ConversionFromPropertyFailed:
9262 OS << "conversion from property failed";
9263 break;
9264
9265 case FK_TooManyInitsForScalar:
9266 OS << "too many initializers for scalar";
9267 break;
9268
9269 case FK_ParenthesizedListInitForScalar:
9270 OS << "parenthesized list init for reference";
9271 break;
9272
9273 case FK_ReferenceBindingToInitList:
9274 OS << "referencing binding to initializer list";
9275 break;
9276
9277 case FK_InitListBadDestinationType:
9278 OS << "initializer list for non-aggregate, non-scalar type";
9279 break;
9280
9281 case FK_UserConversionOverloadFailed:
9282 OS << "overloading failed for user-defined conversion";
9283 break;
9284
9285 case FK_ConstructorOverloadFailed:
9286 OS << "constructor overloading failed";
9287 break;
9288
9289 case FK_DefaultInitOfConst:
9290 OS << "default initialization of a const variable";
9291 break;
9292
9293 case FK_Incomplete:
9294 OS << "initialization of incomplete type";
9295 break;
9296
9297 case FK_ListInitializationFailed:
9298 OS << "list initialization checker failure";
9299 break;
9300
9301 case FK_VariableLengthArrayHasInitializer:
9302 OS << "variable length array has an initializer";
9303 break;
9304
9305 case FK_PlaceholderType:
9306 OS << "initializer expression isn't contextually valid";
9307 break;
9308
9309 case FK_ListConstructorOverloadFailed:
9310 OS << "list constructor overloading failed";
9311 break;
9312
9313 case FK_ExplicitConstructor:
9314 OS << "list copy initialization chose explicit constructor";
9315 break;
9316 }
9317 OS << '\n';
9318 return;
9319 }
9320
9321 case DependentSequence:
9322 OS << "Dependent sequence\n";
9323 return;
9324
9325 case NormalSequence:
9326 OS << "Normal sequence: ";
9327 break;
9328 }
9329
9330 for (step_iterator S = step_begin(), SEnd = step_end(); S != SEnd; ++S) {
9331 if (S != step_begin()) {
9332 OS << " -> ";
9333 }
9334
9335 switch (S->Kind) {
9336 case SK_ResolveAddressOfOverloadedFunction:
9337 OS << "resolve address of overloaded function";
9338 break;
9339
9340 case SK_CastDerivedToBaseRValue:
9341 OS << "derived-to-base (rvalue)";
9342 break;
9343
9344 case SK_CastDerivedToBaseXValue:
9345 OS << "derived-to-base (xvalue)";
9346 break;
9347
9348 case SK_CastDerivedToBaseLValue:
9349 OS << "derived-to-base (lvalue)";
9350 break;
9351
9352 case SK_BindReference:
9353 OS << "bind reference to lvalue";
9354 break;
9355
9356 case SK_BindReferenceToTemporary:
9357 OS << "bind reference to a temporary";
9358 break;
9359
9360 case SK_FinalCopy:
9361 OS << "final copy in class direct-initialization";
9362 break;
9363
9364 case SK_ExtraneousCopyToTemporary:
9365 OS << "extraneous C++03 copy to temporary";
9366 break;
9367
9368 case SK_UserConversion:
9369 OS << "user-defined conversion via " << *S->Function.Function;
9370 break;
9371
9372 case SK_QualificationConversionRValue:
9373 OS << "qualification conversion (rvalue)";
9374 break;
9375
9376 case SK_QualificationConversionXValue:
9377 OS << "qualification conversion (xvalue)";
9378 break;
9379
9380 case SK_QualificationConversionLValue:
9381 OS << "qualification conversion (lvalue)";
9382 break;
9383
9384 case SK_AtomicConversion:
9385 OS << "non-atomic-to-atomic conversion";
9386 break;
9387
9388 case SK_ConversionSequence:
9389 OS << "implicit conversion sequence (";
9390 S->ICS->dump(); // FIXME: use OS
9391 OS << ")";
9392 break;
9393
9394 case SK_ConversionSequenceNoNarrowing:
9395 OS << "implicit conversion sequence with narrowing prohibited (";
9396 S->ICS->dump(); // FIXME: use OS
9397 OS << ")";
9398 break;
9399
9400 case SK_ListInitialization:
9401 OS << "list aggregate initialization";
9402 break;
9403
9404 case SK_UnwrapInitList:
9405 OS << "unwrap reference initializer list";
9406 break;
9407
9408 case SK_RewrapInitList:
9409 OS << "rewrap reference initializer list";
9410 break;
9411
9412 case SK_ConstructorInitialization:
9413 OS << "constructor initialization";
9414 break;
9415
9416 case SK_ConstructorInitializationFromList:
9417 OS << "list initialization via constructor";
9418 break;
9419
9420 case SK_ZeroInitialization:
9421 OS << "zero initialization";
9422 break;
9423
9424 case SK_CAssignment:
9425 OS << "C assignment";
9426 break;
9427
9428 case SK_StringInit:
9429 OS << "string initialization";
9430 break;
9431
9432 case SK_ObjCObjectConversion:
9433 OS << "Objective-C object conversion";
9434 break;
9435
9436 case SK_ArrayLoopIndex:
9437 OS << "indexing for array initialization loop";
9438 break;
9439
9440 case SK_ArrayLoopInit:
9441 OS << "array initialization loop";
9442 break;
9443
9444 case SK_ArrayInit:
9445 OS << "array initialization";
9446 break;
9447
9448 case SK_GNUArrayInit:
9449 OS << "array initialization (GNU extension)";
9450 break;
9451
9452 case SK_ParenthesizedArrayInit:
9453 OS << "parenthesized array initialization";
9454 break;
9455
9456 case SK_PassByIndirectCopyRestore:
9457 OS << "pass by indirect copy and restore";
9458 break;
9459
9460 case SK_PassByIndirectRestore:
9461 OS << "pass by indirect restore";
9462 break;
9463
9464 case SK_ProduceObjCObject:
9465 OS << "Objective-C object retension";
9466 break;
9467
9468 case SK_StdInitializerList:
9469 OS << "std::initializer_list from initializer list";
9470 break;
9471
9472 case SK_StdInitializerListConstructorCall:
9473 OS << "list initialization from std::initializer_list";
9474 break;
9475
9476 case SK_OCLSamplerInit:
9477 OS << "OpenCL sampler_t from integer constant";
9478 break;
9479
9480 case SK_OCLZeroOpaqueType:
9481 OS << "OpenCL opaque type from zero";
9482 break;
9483 }
9484
9485 OS << " [" << S->Type.getAsString() << ']';
9486 }
9487
9488 OS << '\n';
9489}
9490
9491void InitializationSequence::dump() const {
9492 dump(llvm::errs());
9493}
9494
9495static bool NarrowingErrs(const LangOptions &L) {
9496 return L.CPlusPlus11 &&
9497 (!L.MicrosoftExt || L.isCompatibleWithMSVC(LangOptions::MSVC2015));
9498}
9499
9500static void DiagnoseNarrowingInInitList(Sema &S,
9501 const ImplicitConversionSequence &ICS,
9502 QualType PreNarrowingType,
9503 QualType EntityType,
9504 const Expr *PostInit) {
9505 const StandardConversionSequence *SCS = nullptr;
9506 switch (ICS.getKind()) {
9507 case ImplicitConversionSequence::StandardConversion:
9508 SCS = &ICS.Standard;
9509 break;
9510 case ImplicitConversionSequence::UserDefinedConversion:
9511 SCS = &ICS.UserDefined.After;
9512 break;
9513 case ImplicitConversionSequence::AmbiguousConversion:
9514 case ImplicitConversionSequence::EllipsisConversion:
9515 case ImplicitConversionSequence::BadConversion:
9516 return;
9517 }
9518
9519 // C++11 [dcl.init.list]p7: Check whether this is a narrowing conversion.
9520 APValue ConstantValue;
9521 QualType ConstantType;
9522 switch (SCS->getNarrowingKind(S.Context, PostInit, ConstantValue,
9523 ConstantType)) {
9524 case NK_Not_Narrowing:
9525 case NK_Dependent_Narrowing:
9526 // No narrowing occurred.
9527 return;
9528
9529 case NK_Type_Narrowing:
9530 // This was a floating-to-integer conversion, which is always considered a
9531 // narrowing conversion even if the value is a constant and can be
9532 // represented exactly as an integer.
9533 S.Diag(PostInit->getBeginLoc(), NarrowingErrs(S.getLangOpts())
9534 ? diag::ext_init_list_type_narrowing
9535 : diag::warn_init_list_type_narrowing)
9536 << PostInit->getSourceRange()
9537 << PreNarrowingType.getLocalUnqualifiedType()
9538 << EntityType.getLocalUnqualifiedType();
9539 break;
9540
9541 case NK_Constant_Narrowing:
9542 // A constant value was narrowed.
9543 S.Diag(PostInit->getBeginLoc(),
9544 NarrowingErrs(S.getLangOpts())
9545 ? diag::ext_init_list_constant_narrowing
9546 : diag::warn_init_list_constant_narrowing)
9547 << PostInit->getSourceRange()
9548 << ConstantValue.getAsString(S.getASTContext(), ConstantType)
9549 << EntityType.getLocalUnqualifiedType();
9550 break;
9551
9552 case NK_Variable_Narrowing:
9553 // A variable's value may have been narrowed.
9554 S.Diag(PostInit->getBeginLoc(),
9555 NarrowingErrs(S.getLangOpts())
9556 ? diag::ext_init_list_variable_narrowing
9557 : diag::warn_init_list_variable_narrowing)
9558 << PostInit->getSourceRange()
9559 << PreNarrowingType.getLocalUnqualifiedType()
9560 << EntityType.getLocalUnqualifiedType();
9561 break;
9562 }
9563
9564 SmallString<128> StaticCast;
9565 llvm::raw_svector_ostream OS(StaticCast);
9566 OS << "static_cast<";
9567 if (const TypedefType *TT = EntityType->getAs<TypedefType>()) {
9568 // It's important to use the typedef's name if there is one so that the
9569 // fixit doesn't break code using types like int64_t.
9570 //
9571 // FIXME: This will break if the typedef requires qualification. But
9572 // getQualifiedNameAsString() includes non-machine-parsable components.
9573 OS << *TT->getDecl();
9574 } else if (const BuiltinType *BT = EntityType->getAs<BuiltinType>())
9575 OS << BT->getName(S.getLangOpts());
9576 else {
9577 // Oops, we didn't find the actual type of the variable. Don't emit a fixit
9578 // with a broken cast.
9579 return;
9580 }
9581 OS << ">(";
9582 S.Diag(PostInit->getBeginLoc(), diag::note_init_list_narrowing_silence)
9583 << PostInit->getSourceRange()
9584 << FixItHint::CreateInsertion(PostInit->getBeginLoc(), OS.str())
9585 << FixItHint::CreateInsertion(
9586 S.getLocForEndOfToken(PostInit->getEndLoc()), ")");
9587}
9588
9589//===----------------------------------------------------------------------===//
9590// Initialization helper functions
9591//===----------------------------------------------------------------------===//
9592bool
9593Sema::CanPerformCopyInitialization(const InitializedEntity &Entity,
9594 ExprResult Init) {
9595 if (Init.isInvalid())
9596 return false;
9597
9598 Expr *InitE = Init.get();
9599 assert(InitE && "No initialization expression")((InitE && "No initialization expression") ? static_cast
<void> (0) : __assert_fail ("InitE && \"No initialization expression\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 9599, __PRETTY_FUNCTION__))
;
9600
9601 InitializationKind Kind =
9602 InitializationKind::CreateCopy(InitE->getBeginLoc(), SourceLocation());
9603 InitializationSequence Seq(*this, Entity, Kind, InitE);
9604 return !Seq.Failed();
9605}
9606
9607ExprResult
9608Sema::PerformCopyInitialization(const InitializedEntity &Entity,
9609 SourceLocation EqualLoc,
9610 ExprResult Init,
9611 bool TopLevelOfInitList,
9612 bool AllowExplicit) {
9613 if (Init.isInvalid())
9614 return ExprError();
9615
9616 Expr *InitE = Init.get();
9617 assert(InitE && "No initialization expression?")((InitE && "No initialization expression?") ? static_cast
<void> (0) : __assert_fail ("InitE && \"No initialization expression?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 9617, __PRETTY_FUNCTION__))
;
9618
9619 if (EqualLoc.isInvalid())
9620 EqualLoc = InitE->getBeginLoc();
9621
9622 InitializationKind Kind = InitializationKind::CreateCopy(
9623 InitE->getBeginLoc(), EqualLoc, AllowExplicit);
9624 InitializationSequence Seq(*this, Entity, Kind, InitE, TopLevelOfInitList);
9625
9626 // Prevent infinite recursion when performing parameter copy-initialization.
9627 const bool ShouldTrackCopy =
9628 Entity.isParameterKind() && Seq.isConstructorInitialization();
9629 if (ShouldTrackCopy) {
9630 if (llvm::find(CurrentParameterCopyTypes, Entity.getType()) !=
9631 CurrentParameterCopyTypes.end()) {
9632 Seq.SetOverloadFailure(
9633 InitializationSequence::FK_ConstructorOverloadFailed,
9634 OR_No_Viable_Function);
9635
9636 // Try to give a meaningful diagnostic note for the problematic
9637 // constructor.
9638 const auto LastStep = Seq.step_end() - 1;
9639 assert(LastStep->Kind ==((LastStep->Kind == InitializationSequence::SK_ConstructorInitialization
) ? static_cast<void> (0) : __assert_fail ("LastStep->Kind == InitializationSequence::SK_ConstructorInitialization"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 9640, __PRETTY_FUNCTION__))
9640 InitializationSequence::SK_ConstructorInitialization)((LastStep->Kind == InitializationSequence::SK_ConstructorInitialization
) ? static_cast<void> (0) : __assert_fail ("LastStep->Kind == InitializationSequence::SK_ConstructorInitialization"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 9640, __PRETTY_FUNCTION__))
;
9641 const FunctionDecl *Function = LastStep->Function.Function;
9642 auto Candidate =
9643 llvm::find_if(Seq.getFailedCandidateSet(),
9644 [Function](const OverloadCandidate &Candidate) -> bool {
9645 return Candidate.Viable &&
9646 Candidate.Function == Function &&
9647 Candidate.Conversions.size() > 0;
9648 });
9649 if (Candidate != Seq.getFailedCandidateSet().end() &&
9650 Function->getNumParams() > 0) {
9651 Candidate->Viable = false;
9652 Candidate->FailureKind = ovl_fail_bad_conversion;
9653 Candidate->Conversions[0].setBad(BadConversionSequence::no_conversion,
9654 InitE,
9655 Function->getParamDecl(0)->getType());
9656 }
9657 }
9658 CurrentParameterCopyTypes.push_back(Entity.getType());
9659 }
9660
9661 ExprResult Result = Seq.Perform(*this, Entity, Kind, InitE);
9662
9663 if (ShouldTrackCopy)
9664 CurrentParameterCopyTypes.pop_back();
9665
9666 return Result;
9667}
9668
9669/// Determine whether RD is, or is derived from, a specialization of CTD.
9670static bool isOrIsDerivedFromSpecializationOf(CXXRecordDecl *RD,
9671 ClassTemplateDecl *CTD) {
9672 auto NotSpecialization = [&] (const CXXRecordDecl *Candidate) {
9673 auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(Candidate);
9674 return !CTSD || !declaresSameEntity(CTSD->getSpecializedTemplate(), CTD);
9675 };
9676 return !(NotSpecialization(RD) && RD->forallBases(NotSpecialization));
9677}
9678
9679QualType Sema::DeduceTemplateSpecializationFromInitializer(
9680 TypeSourceInfo *TSInfo, const InitializedEntity &Entity,
9681 const InitializationKind &Kind, MultiExprArg Inits) {
9682 auto *DeducedTST = dyn_cast<DeducedTemplateSpecializationType>(
9683 TSInfo->getType()->getContainedDeducedType());
9684 assert(DeducedTST && "not a deduced template specialization type")((DeducedTST && "not a deduced template specialization type"
) ? static_cast<void> (0) : __assert_fail ("DeducedTST && \"not a deduced template specialization type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaInit.cpp"
, 9684, __PRETTY_FUNCTION__))
;
9685
9686 auto TemplateName = DeducedTST->getTemplateName();
9687 if (TemplateName.isDependent())
9688 return Context.DependentTy;
9689
9690 // We can only perform deduction for class templates.
9691 auto *Template =
9692 dyn_cast_or_null<ClassTemplateDecl>(TemplateName.getAsTemplateDecl());
9693 if (!Template) {
9694 Diag(Kind.getLocation(),
9695 diag::err_deduced_non_class_template_specialization_type)
9696 << (int)getTemplateNameKindForDiagnostics(TemplateName) << TemplateName;
9697 if (auto *TD = TemplateName.getAsTemplateDecl())
9698 Diag(TD->getLocation(), diag::note_template_decl_here);
9699 return QualType();
9700 }
9701
9702 // Can't deduce from dependent arguments.
9703 if (Expr::hasAnyTypeDependentArguments(Inits)) {
9704 Diag(TSInfo->getTypeLoc().getBeginLoc(),
9705 diag::warn_cxx14_compat_class_template_argument_deduction)
9706 << TSInfo->getTypeLoc().getSourceRange() << 0;
9707 return Context.DependentTy;
9708 }
9709
9710 // FIXME: Perform "exact type" matching first, per CWG discussion?
9711 // Or implement this via an implied 'T(T) -> T' deduction guide?
9712
9713 // FIXME: Do we need/want a std::initializer_list<T> special case?
9714
9715 // Look up deduction guides, including those synthesized from constructors.
9716 //
9717 // C++1z [over.match.class.deduct]p1:
9718 // A set of functions and function templates is formed comprising:
9719 // - For each constructor of the class template designated by the
9720 // template-name, a function template [...]
9721 // - For each deduction-guide, a function or function template [...]
9722 DeclarationNameInfo NameInfo(
9723 Context.DeclarationNames.getCXXDeductionGuideName(Template),
9724 TSInfo->getTypeLoc().getEndLoc());
9725 LookupResult Guides(*this, NameInfo, LookupOrdinaryName);
9726 LookupQualifiedName(Guides, Template->getDeclContext());
9727
9728 // FIXME: Do not diagnose inaccessible deduction guides. The standard isn't
9729 // clear on this, but they're not found by name so access does not apply.
9730 Guides.suppressDiagnostics();
9731
9732 // Figure out if this is list-initialization.
9733 InitListExpr *ListInit =
9734 (Inits.size() == 1 && Kind.getKind() != InitializationKind::IK_Direct)
9735 ? dyn_cast<InitListExpr>(Inits[0])
9736 : nullptr;
9737
9738 // C++1z [over.match.class.deduct]p1:
9739 // Initialization and overload resolution are performed as described in
9740 // [dcl.init] and [over.match.ctor], [over.match.copy], or [over.match.list]
9741 // (as appropriate for the type of initialization performed) for an object
9742 // of a hypothetical class type, where the selected functions and function
9743 // templates are considered to be the constructors of that class type
9744 //
9745 // Since we know we're initializing a class type of a type unrelated to that
9746 // of the initializer, this reduces to something fairly reasonable.
9747 OverloadCandidateSet Candidates(Kind.getLocation(),
9748 OverloadCandidateSet::CSK_Normal);
9749 OverloadCandidateSet::iterator Best;
9750
9751 bool HasAnyDeductionGuide = false;
9752 bool AllowExplicit = !Kind.isCopyInit() || ListInit;
9753
9754 auto tryToResolveOverload =
9755 [&](bool OnlyListConstructors) -> OverloadingResult {
9756 Candidates.clear(OverloadCandidateSet::CSK_Normal);
9757 HasAnyDeductionGuide = false;
9758
9759 for (auto I = Guides.begin(), E = Guides.end(); I != E; ++I) {
9760 NamedDecl *D = (*I)->getUnderlyingDecl();
9761 if (D->isInvalidDecl())
9762 continue;
9763
9764 auto *TD = dyn_cast<FunctionTemplateDecl>(D);
9765 auto *GD = dyn_cast_or_null<CXXDeductionGuideDecl>(
9766 TD ? TD->getTemplatedDecl() : dyn_cast<FunctionDecl>(D));
9767 if (!GD)
9768 continue;
9769
9770 if (!GD->isImplicit())
9771 HasAnyDeductionGuide = true;
9772
9773 // C++ [over.match.ctor]p1: (non-list copy-initialization from non-class)
9774 // For copy-initialization, the candidate functions are all the
9775 // converting constructors (12.3.1) of that class.
9776 // C++ [over.match.copy]p1: (non-list copy-initialization from class)
9777 // The converting constructors of T are candidate functions.
9778 if (!AllowExplicit) {
9779 // Overload resolution checks whether the deduction guide is declared
9780 // explicit for us.
9781
9782 // When looking for a converting constructor, deduction guides that
9783 // could never be called with one argument are not interesting to
9784 // check or note.
9785 if (GD->getMinRequiredArguments() > 1 ||
9786 (GD->getNumParams() == 0 && !GD->isVariadic()))
9787 continue;
9788 }
9789
9790 // C++ [over.match.list]p1.1: (first phase list initialization)
9791 // Initially, the candidate functions are the initializer-list
9792 // constructors of the class T
9793 if (OnlyListConstructors && !isInitListConstructor(GD))
9794 continue;
9795
9796 // C++ [over.match.list]p1.2: (second phase list initialization)
9797 // the candidate functions are all the constructors of the class T
9798 // C++ [over.match.ctor]p1: (all other cases)
9799 // the candidate functions are all the constructors of the class of
9800 // the object being initialized
9801
9802 // C++ [over.best.ics]p4:
9803 // When [...] the constructor [...] is a candidate by
9804 // - [over.match.copy] (in all cases)
9805 // FIXME: The "second phase of [over.match.list] case can also
9806 // theoretically happen here, but it's not clear whether we can
9807 // ever have a parameter of the right type.
9808 bool SuppressUserConversions = Kind.isCopyInit();
9809
9810 if (TD)
9811 AddTemplateOverloadCandidate(TD, I.getPair(), /*ExplicitArgs*/ nullptr,
9812 Inits, Candidates, SuppressUserConversions,
9813 /*PartialOverloading*/ false,
9814 AllowExplicit);
9815 else
9816 AddOverloadCandidate(GD, I.getPair(), Inits, Candidates,
9817 SuppressUserConversions,
9818 /*PartialOverloading*/ false, AllowExplicit);
9819 }
9820 return Candidates.BestViableFunction(*this, Kind.getLocation(), Best);
9821 };
9822
9823 OverloadingResult Result = OR_No_Viable_Function;
9824
9825 // C++11 [over.match.list]p1, per DR1467: for list-initialization, first
9826 // try initializer-list constructors.
9827 if (ListInit) {
9828 bool TryListConstructors = true;
9829
9830 // Try list constructors unless the list is empty and the class has one or
9831 // more default constructors, in which case those constructors win.
9832 if (!ListInit->getNumInits()) {
9833 for (NamedDecl *D : Guides) {
9834 auto *FD = dyn_cast<FunctionDecl>(D->getUnderlyingDecl());
9835 if (FD && FD->getMinRequiredArguments() == 0) {
9836 TryListConstructors = false;
9837 break;
9838 }
9839 }
9840 } else if (ListInit->getNumInits() == 1) {
9841 // C++ [over.match.class.deduct]:
9842 // As an exception, the first phase in [over.match.list] (considering
9843 // initializer-list constructors) is omitted if the initializer list
9844 // consists of a single expression of type cv U, where U is a
9845 // specialization of C or a class derived from a specialization of C.
9846 Expr *E = ListInit->getInit(0);
9847 auto *RD = E->getType()->getAsCXXRecordDecl();
9848 if (!isa<InitListExpr>(E) && RD &&
9849 isCompleteType(Kind.getLocation(), E->getType()) &&
9850 isOrIsDerivedFromSpecializationOf(RD, Template))
9851 TryListConstructors = false;
9852 }
9853
9854 if (TryListConstructors)
9855 Result = tryToResolveOverload(/*OnlyListConstructor*/true);
9856 // Then unwrap the initializer list and try again considering all
9857 // constructors.
9858 Inits = MultiExprArg(ListInit->getInits(), ListInit->getNumInits());
9859 }
9860
9861 // If list-initialization fails, or if we're doing any other kind of
9862 // initialization, we (eventually) consider constructors.
9863 if (Result == OR_No_Viable_Function)
9864 Result = tryToResolveOverload(/*OnlyListConstructor*/false);
9865
9866 switch (Result) {
9867 case OR_Ambiguous:
9868 // FIXME: For list-initialization candidates, it'd usually be better to
9869 // list why they were not viable when given the initializer list itself as
9870 // an argument.
9871 Candidates.NoteCandidates(
9872 PartialDiagnosticAt(
9873 Kind.getLocation(),
9874 PDiag(diag::err_deduced_class_template_ctor_ambiguous)
9875 << TemplateName),
9876 *this, OCD_AmbiguousCandidates, Inits);
9877 return QualType();
9878
9879 case OR_No_Viable_Function: {
9880 CXXRecordDecl *Primary =
9881 cast<ClassTemplateDecl>(Template)->getTemplatedDecl();
9882 bool Complete =
9883 isCompleteType(Kind.getLocation(), Context.getTypeDeclType(Primary));
9884 Candidates.NoteCandidates(
9885 PartialDiagnosticAt(
9886 Kind.getLocation(),
9887 PDiag(Complete ? diag::err_deduced_class_template_ctor_no_viable
9888 : diag::err_deduced_class_template_incomplete)
9889 << TemplateName << !Guides.empty()),
9890 *this, OCD_AllCandidates, Inits);
9891 return QualType();
9892 }
9893
9894 case OR_Deleted: {
9895 Diag(Kind.getLocation(), diag::err_deduced_class_template_deleted)
9896 << TemplateName;
9897 NoteDeletedFunction(Best->Function);
9898 return QualType();
9899 }
9900
9901 case OR_Success:
9902 // C++ [over.match.list]p1:
9903 // In copy-list-initialization, if an explicit constructor is chosen, the
9904 // initialization is ill-formed.
9905 if (Kind.isCopyInit() && ListInit &&
9906 cast<CXXDeductionGuideDecl>(Best->Function)->isExplicit()) {
9907 bool IsDeductionGuide = !Best->Function->isImplicit();
9908 Diag(Kind.getLocation(), diag::err_deduced_class_template_explicit)
9909 << TemplateName << IsDeductionGuide;
9910 Diag(Best->Function->getLocation(),
9911 diag::note_explicit_ctor_deduction_guide_here)
9912 << IsDeductionGuide;
9913 return QualType();
9914 }
9915
9916 // Make sure we didn't select an unusable deduction guide, and mark it
9917 // as referenced.
9918 DiagnoseUseOfDecl(Best->Function, Kind.getLocation());
9919 MarkFunctionReferenced(Kind.getLocation(), Best->Function);
9920 break;
9921 }
9922
9923 // C++ [dcl.type.class.deduct]p1:
9924 // The placeholder is replaced by the return type of the function selected
9925 // by overload resolution for class template deduction.
9926 QualType DeducedType =
9927 SubstAutoType(TSInfo->getType(), Best->Function->getReturnType());
9928 Diag(TSInfo->getTypeLoc().getBeginLoc(),
9929 diag::warn_cxx14_compat_class_template_argument_deduction)
9930 << TSInfo->getTypeLoc().getSourceRange() << 1 << DeducedType;
9931
9932 // Warn if CTAD was used on a type that does not have any user-defined
9933 // deduction guides.
9934 if (!HasAnyDeductionGuide) {
9935 Diag(TSInfo->getTypeLoc().getBeginLoc(),
9936 diag::warn_ctad_maybe_unsupported)
9937 << TemplateName;
9938 Diag(Template->getLocation(), diag::note_suppress_ctad_maybe_unsupported);
9939 }
9940
9941 return DeducedType;
9942}

/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h

1//===- Type.h - C Language Family Type Representation -----------*- C++ -*-===//
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/// \file
10/// C Language Family Type Representation
11///
12/// This file defines the clang::Type interface and subclasses, used to
13/// represent types for languages in the C family.
14//
15//===----------------------------------------------------------------------===//
16
17#ifndef LLVM_CLANG_AST_TYPE_H
18#define LLVM_CLANG_AST_TYPE_H
19
20#include "clang/AST/NestedNameSpecifier.h"
21#include "clang/AST/TemplateName.h"
22#include "clang/Basic/AddressSpaces.h"
23#include "clang/Basic/AttrKinds.h"
24#include "clang/Basic/Diagnostic.h"
25#include "clang/Basic/ExceptionSpecificationType.h"
26#include "clang/Basic/LLVM.h"
27#include "clang/Basic/Linkage.h"
28#include "clang/Basic/PartialDiagnostic.h"
29#include "clang/Basic/SourceLocation.h"
30#include "clang/Basic/Specifiers.h"
31#include "clang/Basic/Visibility.h"
32#include "llvm/ADT/APInt.h"
33#include "llvm/ADT/APSInt.h"
34#include "llvm/ADT/ArrayRef.h"
35#include "llvm/ADT/FoldingSet.h"
36#include "llvm/ADT/None.h"
37#include "llvm/ADT/Optional.h"
38#include "llvm/ADT/PointerIntPair.h"
39#include "llvm/ADT/PointerUnion.h"
40#include "llvm/ADT/StringRef.h"
41#include "llvm/ADT/Twine.h"
42#include "llvm/ADT/iterator_range.h"
43#include "llvm/Support/Casting.h"
44#include "llvm/Support/Compiler.h"
45#include "llvm/Support/ErrorHandling.h"
46#include "llvm/Support/PointerLikeTypeTraits.h"
47#include "llvm/Support/type_traits.h"
48#include "llvm/Support/TrailingObjects.h"
49#include <cassert>
50#include <cstddef>
51#include <cstdint>
52#include <cstring>
53#include <string>
54#include <type_traits>
55#include <utility>
56
57namespace clang {
58
59class ExtQuals;
60class QualType;
61class TagDecl;
62class Type;
63
64enum {
65 TypeAlignmentInBits = 4,
66 TypeAlignment = 1 << TypeAlignmentInBits
67};
68
69namespace serialization {
70 template <class T> class AbstractTypeReader;
71 template <class T> class AbstractTypeWriter;
72}
73
74} // namespace clang
75
76namespace llvm {
77
78 template <typename T>
79 struct PointerLikeTypeTraits;
80 template<>
81 struct PointerLikeTypeTraits< ::clang::Type*> {
82 static inline void *getAsVoidPointer(::clang::Type *P) { return P; }
83
84 static inline ::clang::Type *getFromVoidPointer(void *P) {
85 return static_cast< ::clang::Type*>(P);
86 }
87
88 enum { NumLowBitsAvailable = clang::TypeAlignmentInBits };
89 };
90
91 template<>
92 struct PointerLikeTypeTraits< ::clang::ExtQuals*> {
93 static inline void *getAsVoidPointer(::clang::ExtQuals *P) { return P; }
94
95 static inline ::clang::ExtQuals *getFromVoidPointer(void *P) {
96 return static_cast< ::clang::ExtQuals*>(P);
97 }
98
99 enum { NumLowBitsAvailable = clang::TypeAlignmentInBits };
100 };
101
102} // namespace llvm
103
104namespace clang {
105
106class ASTContext;
107template <typename> class CanQual;
108class CXXRecordDecl;
109class DeclContext;
110class EnumDecl;
111class Expr;
112class ExtQualsTypeCommonBase;
113class FunctionDecl;
114class IdentifierInfo;
115class NamedDecl;
116class ObjCInterfaceDecl;
117class ObjCProtocolDecl;
118class ObjCTypeParamDecl;
119struct PrintingPolicy;
120class RecordDecl;
121class Stmt;
122class TagDecl;
123class TemplateArgument;
124class TemplateArgumentListInfo;
125class TemplateArgumentLoc;
126class TemplateTypeParmDecl;
127class TypedefNameDecl;
128class UnresolvedUsingTypenameDecl;
129
130using CanQualType = CanQual<Type>;
131
132// Provide forward declarations for all of the *Type classes.
133#define TYPE(Class, Base) class Class##Type;
134#include "clang/AST/TypeNodes.inc"
135
136/// The collection of all-type qualifiers we support.
137/// Clang supports five independent qualifiers:
138/// * C99: const, volatile, and restrict
139/// * MS: __unaligned
140/// * Embedded C (TR18037): address spaces
141/// * Objective C: the GC attributes (none, weak, or strong)
142class Qualifiers {
143public:
144 enum TQ { // NOTE: These flags must be kept in sync with DeclSpec::TQ.
145 Const = 0x1,
146 Restrict = 0x2,
147 Volatile = 0x4,
148 CVRMask = Const | Volatile | Restrict
149 };
150
151 enum GC {
152 GCNone = 0,
153 Weak,
154 Strong
155 };
156
157 enum ObjCLifetime {
158 /// There is no lifetime qualification on this type.
159 OCL_None,
160
161 /// This object can be modified without requiring retains or
162 /// releases.
163 OCL_ExplicitNone,
164
165 /// Assigning into this object requires the old value to be
166 /// released and the new value to be retained. The timing of the
167 /// release of the old value is inexact: it may be moved to
168 /// immediately after the last known point where the value is
169 /// live.
170 OCL_Strong,
171
172 /// Reading or writing from this object requires a barrier call.
173 OCL_Weak,
174
175 /// Assigning into this object requires a lifetime extension.
176 OCL_Autoreleasing
177 };
178
179 enum {
180 /// The maximum supported address space number.
181 /// 23 bits should be enough for anyone.
182 MaxAddressSpace = 0x7fffffu,
183
184 /// The width of the "fast" qualifier mask.
185 FastWidth = 3,
186
187 /// The fast qualifier mask.
188 FastMask = (1 << FastWidth) - 1
189 };
190
191 /// Returns the common set of qualifiers while removing them from
192 /// the given sets.
193 static Qualifiers removeCommonQualifiers(Qualifiers &L, Qualifiers &R) {
194 // If both are only CVR-qualified, bit operations are sufficient.
195 if (!(L.Mask & ~CVRMask) && !(R.Mask & ~CVRMask)) {
196 Qualifiers Q;
197 Q.Mask = L.Mask & R.Mask;
198 L.Mask &= ~Q.Mask;
199 R.Mask &= ~Q.Mask;
200 return Q;
201 }
202
203 Qualifiers Q;
204 unsigned CommonCRV = L.getCVRQualifiers() & R.getCVRQualifiers();
205 Q.addCVRQualifiers(CommonCRV);
206 L.removeCVRQualifiers(CommonCRV);
207 R.removeCVRQualifiers(CommonCRV);
208
209 if (L.getObjCGCAttr() == R.getObjCGCAttr()) {
210 Q.setObjCGCAttr(L.getObjCGCAttr());
211 L.removeObjCGCAttr();
212 R.removeObjCGCAttr();
213 }
214
215 if (L.getObjCLifetime() == R.getObjCLifetime()) {
216 Q.setObjCLifetime(L.getObjCLifetime());
217 L.removeObjCLifetime();
218 R.removeObjCLifetime();
219 }
220
221 if (L.getAddressSpace() == R.getAddressSpace()) {
222 Q.setAddressSpace(L.getAddressSpace());
223 L.removeAddressSpace();
224 R.removeAddressSpace();
225 }
226 return Q;
227 }
228
229 static Qualifiers fromFastMask(unsigned Mask) {
230 Qualifiers Qs;
231 Qs.addFastQualifiers(Mask);
232 return Qs;
233 }
234
235 static Qualifiers fromCVRMask(unsigned CVR) {
236 Qualifiers Qs;
237 Qs.addCVRQualifiers(CVR);
238 return Qs;
239 }
240
241 static Qualifiers fromCVRUMask(unsigned CVRU) {
242 Qualifiers Qs;
243 Qs.addCVRUQualifiers(CVRU);
244 return Qs;
245 }
246
247 // Deserialize qualifiers from an opaque representation.
248 static Qualifiers fromOpaqueValue(unsigned opaque) {
249 Qualifiers Qs;
250 Qs.Mask = opaque;
251 return Qs;
252 }
253
254 // Serialize these qualifiers into an opaque representation.
255 unsigned getAsOpaqueValue() const {
256 return Mask;
257 }
258
259 bool hasConst() const { return Mask & Const; }
260 bool hasOnlyConst() const { return Mask == Const; }
261 void removeConst() { Mask &= ~Const; }
262 void addConst() { Mask |= Const; }
263
264 bool hasVolatile() const { return Mask & Volatile; }
265 bool hasOnlyVolatile() const { return Mask == Volatile; }
266 void removeVolatile() { Mask &= ~Volatile; }
267 void addVolatile() { Mask |= Volatile; }
268
269 bool hasRestrict() const { return Mask & Restrict; }
270 bool hasOnlyRestrict() const { return Mask == Restrict; }
271 void removeRestrict() { Mask &= ~Restrict; }
272 void addRestrict() { Mask |= Restrict; }
273
274 bool hasCVRQualifiers() const { return getCVRQualifiers(); }
275 unsigned getCVRQualifiers() const { return Mask & CVRMask; }
276 unsigned getCVRUQualifiers() const { return Mask & (CVRMask | UMask); }
277
278 void setCVRQualifiers(unsigned mask) {
279 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits")((!(mask & ~CVRMask) && "bitmask contains non-CVR bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~CVRMask) && \"bitmask contains non-CVR bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 279, __PRETTY_FUNCTION__))
;
280 Mask = (Mask & ~CVRMask) | mask;
281 }
282 void removeCVRQualifiers(unsigned mask) {
283 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits")((!(mask & ~CVRMask) && "bitmask contains non-CVR bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~CVRMask) && \"bitmask contains non-CVR bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 283, __PRETTY_FUNCTION__))
;
284 Mask &= ~mask;
285 }
286 void removeCVRQualifiers() {
287 removeCVRQualifiers(CVRMask);
288 }
289 void addCVRQualifiers(unsigned mask) {
290 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits")((!(mask & ~CVRMask) && "bitmask contains non-CVR bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~CVRMask) && \"bitmask contains non-CVR bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 290, __PRETTY_FUNCTION__))
;
291 Mask |= mask;
292 }
293 void addCVRUQualifiers(unsigned mask) {
294 assert(!(mask & ~CVRMask & ~UMask) && "bitmask contains non-CVRU bits")((!(mask & ~CVRMask & ~UMask) && "bitmask contains non-CVRU bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~CVRMask & ~UMask) && \"bitmask contains non-CVRU bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 294, __PRETTY_FUNCTION__))
;
295 Mask |= mask;
296 }
297
298 bool hasUnaligned() const { return Mask & UMask; }
299 void setUnaligned(bool flag) {
300 Mask = (Mask & ~UMask) | (flag ? UMask : 0);
301 }
302 void removeUnaligned() { Mask &= ~UMask; }
303 void addUnaligned() { Mask |= UMask; }
304
305 bool hasObjCGCAttr() const { return Mask & GCAttrMask; }
306 GC getObjCGCAttr() const { return GC((Mask & GCAttrMask) >> GCAttrShift); }
307 void setObjCGCAttr(GC type) {
308 Mask = (Mask & ~GCAttrMask) | (type << GCAttrShift);
309 }
310 void removeObjCGCAttr() { setObjCGCAttr(GCNone); }
311 void addObjCGCAttr(GC type) {
312 assert(type)((type) ? static_cast<void> (0) : __assert_fail ("type"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 312, __PRETTY_FUNCTION__))
;
313 setObjCGCAttr(type);
314 }
315 Qualifiers withoutObjCGCAttr() const {
316 Qualifiers qs = *this;
317 qs.removeObjCGCAttr();
318 return qs;
319 }
320 Qualifiers withoutObjCLifetime() const {
321 Qualifiers qs = *this;
322 qs.removeObjCLifetime();
323 return qs;
324 }
325 Qualifiers withoutAddressSpace() const {
326 Qualifiers qs = *this;
327 qs.removeAddressSpace();
328 return qs;
329 }
330
331 bool hasObjCLifetime() const { return Mask & LifetimeMask; }
332 ObjCLifetime getObjCLifetime() const {
333 return ObjCLifetime((Mask & LifetimeMask) >> LifetimeShift);
334 }
335 void setObjCLifetime(ObjCLifetime type) {
336 Mask = (Mask & ~LifetimeMask) | (type << LifetimeShift);
337 }
338 void removeObjCLifetime() { setObjCLifetime(OCL_None); }
339 void addObjCLifetime(ObjCLifetime type) {
340 assert(type)((type) ? static_cast<void> (0) : __assert_fail ("type"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 340, __PRETTY_FUNCTION__))
;
341 assert(!hasObjCLifetime())((!hasObjCLifetime()) ? static_cast<void> (0) : __assert_fail
("!hasObjCLifetime()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 341, __PRETTY_FUNCTION__))
;
342 Mask |= (type << LifetimeShift);
343 }
344
345 /// True if the lifetime is neither None or ExplicitNone.
346 bool hasNonTrivialObjCLifetime() const {
347 ObjCLifetime lifetime = getObjCLifetime();
348 return (lifetime > OCL_ExplicitNone);
349 }
350
351 /// True if the lifetime is either strong or weak.
352 bool hasStrongOrWeakObjCLifetime() const {
353 ObjCLifetime lifetime = getObjCLifetime();
354 return (lifetime == OCL_Strong || lifetime == OCL_Weak);
355 }
356
357 bool hasAddressSpace() const { return Mask & AddressSpaceMask; }
358 LangAS getAddressSpace() const {
359 return static_cast<LangAS>(Mask >> AddressSpaceShift);
360 }
361 bool hasTargetSpecificAddressSpace() const {
362 return isTargetAddressSpace(getAddressSpace());
363 }
364 /// Get the address space attribute value to be printed by diagnostics.
365 unsigned getAddressSpaceAttributePrintValue() const {
366 auto Addr = getAddressSpace();
367 // This function is not supposed to be used with language specific
368 // address spaces. If that happens, the diagnostic message should consider
369 // printing the QualType instead of the address space value.
370 assert(Addr == LangAS::Default || hasTargetSpecificAddressSpace())((Addr == LangAS::Default || hasTargetSpecificAddressSpace())
? static_cast<void> (0) : __assert_fail ("Addr == LangAS::Default || hasTargetSpecificAddressSpace()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 370, __PRETTY_FUNCTION__))
;
371 if (Addr != LangAS::Default)
372 return toTargetAddressSpace(Addr);
373 // TODO: The diagnostic messages where Addr may be 0 should be fixed
374 // since it cannot differentiate the situation where 0 denotes the default
375 // address space or user specified __attribute__((address_space(0))).
376 return 0;
377 }
378 void setAddressSpace(LangAS space) {
379 assert((unsigned)space <= MaxAddressSpace)(((unsigned)space <= MaxAddressSpace) ? static_cast<void
> (0) : __assert_fail ("(unsigned)space <= MaxAddressSpace"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 379, __PRETTY_FUNCTION__))
;
380 Mask = (Mask & ~AddressSpaceMask)
381 | (((uint32_t) space) << AddressSpaceShift);
382 }
383 void removeAddressSpace() { setAddressSpace(LangAS::Default); }
384 void addAddressSpace(LangAS space) {
385 assert(space != LangAS::Default)((space != LangAS::Default) ? static_cast<void> (0) : __assert_fail
("space != LangAS::Default", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 385, __PRETTY_FUNCTION__))
;
386 setAddressSpace(space);
387 }
388
389 // Fast qualifiers are those that can be allocated directly
390 // on a QualType object.
391 bool hasFastQualifiers() const { return getFastQualifiers(); }
392 unsigned getFastQualifiers() const { return Mask & FastMask; }
393 void setFastQualifiers(unsigned mask) {
394 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits")((!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~FastMask) && \"bitmask contains non-fast qualifier bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 394, __PRETTY_FUNCTION__))
;
395 Mask = (Mask & ~FastMask) | mask;
396 }
397 void removeFastQualifiers(unsigned mask) {
398 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits")((!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~FastMask) && \"bitmask contains non-fast qualifier bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 398, __PRETTY_FUNCTION__))
;
399 Mask &= ~mask;
400 }
401 void removeFastQualifiers() {
402 removeFastQualifiers(FastMask);
403 }
404 void addFastQualifiers(unsigned mask) {
405 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits")((!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"
) ? static_cast<void> (0) : __assert_fail ("!(mask & ~FastMask) && \"bitmask contains non-fast qualifier bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 405, __PRETTY_FUNCTION__))
;
406 Mask |= mask;
407 }
408
409 /// Return true if the set contains any qualifiers which require an ExtQuals
410 /// node to be allocated.
411 bool hasNonFastQualifiers() const { return Mask & ~FastMask; }
412 Qualifiers getNonFastQualifiers() const {
413 Qualifiers Quals = *this;
414 Quals.setFastQualifiers(0);
415 return Quals;
416 }
417
418 /// Return true if the set contains any qualifiers.
419 bool hasQualifiers() const { return Mask; }
420 bool empty() const { return !Mask; }
421
422 /// Add the qualifiers from the given set to this set.
423 void addQualifiers(Qualifiers Q) {
424 // If the other set doesn't have any non-boolean qualifiers, just
425 // bit-or it in.
426 if (!(Q.Mask & ~CVRMask))
427 Mask |= Q.Mask;
428 else {
429 Mask |= (Q.Mask & CVRMask);
430 if (Q.hasAddressSpace())
431 addAddressSpace(Q.getAddressSpace());
432 if (Q.hasObjCGCAttr())
433 addObjCGCAttr(Q.getObjCGCAttr());
434 if (Q.hasObjCLifetime())
435 addObjCLifetime(Q.getObjCLifetime());
436 }
437 }
438
439 /// Remove the qualifiers from the given set from this set.
440 void removeQualifiers(Qualifiers Q) {
441 // If the other set doesn't have any non-boolean qualifiers, just
442 // bit-and the inverse in.
443 if (!(Q.Mask & ~CVRMask))
444 Mask &= ~Q.Mask;
445 else {
446 Mask &= ~(Q.Mask & CVRMask);
447 if (getObjCGCAttr() == Q.getObjCGCAttr())
448 removeObjCGCAttr();
449 if (getObjCLifetime() == Q.getObjCLifetime())
450 removeObjCLifetime();
451 if (getAddressSpace() == Q.getAddressSpace())
452 removeAddressSpace();
453 }
454 }
455
456 /// Add the qualifiers from the given set to this set, given that
457 /// they don't conflict.
458 void addConsistentQualifiers(Qualifiers qs) {
459 assert(getAddressSpace() == qs.getAddressSpace() ||((getAddressSpace() == qs.getAddressSpace() || !hasAddressSpace
() || !qs.hasAddressSpace()) ? static_cast<void> (0) : __assert_fail
("getAddressSpace() == qs.getAddressSpace() || !hasAddressSpace() || !qs.hasAddressSpace()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 460, __PRETTY_FUNCTION__))
460 !hasAddressSpace() || !qs.hasAddressSpace())((getAddressSpace() == qs.getAddressSpace() || !hasAddressSpace
() || !qs.hasAddressSpace()) ? static_cast<void> (0) : __assert_fail
("getAddressSpace() == qs.getAddressSpace() || !hasAddressSpace() || !qs.hasAddressSpace()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 460, __PRETTY_FUNCTION__))
;
461 assert(getObjCGCAttr() == qs.getObjCGCAttr() ||((getObjCGCAttr() == qs.getObjCGCAttr() || !hasObjCGCAttr() ||
!qs.hasObjCGCAttr()) ? static_cast<void> (0) : __assert_fail
("getObjCGCAttr() == qs.getObjCGCAttr() || !hasObjCGCAttr() || !qs.hasObjCGCAttr()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 462, __PRETTY_FUNCTION__))
462 !hasObjCGCAttr() || !qs.hasObjCGCAttr())((getObjCGCAttr() == qs.getObjCGCAttr() || !hasObjCGCAttr() ||
!qs.hasObjCGCAttr()) ? static_cast<void> (0) : __assert_fail
("getObjCGCAttr() == qs.getObjCGCAttr() || !hasObjCGCAttr() || !qs.hasObjCGCAttr()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 462, __PRETTY_FUNCTION__))
;
463 assert(getObjCLifetime() == qs.getObjCLifetime() ||((getObjCLifetime() == qs.getObjCLifetime() || !hasObjCLifetime
() || !qs.hasObjCLifetime()) ? static_cast<void> (0) : __assert_fail
("getObjCLifetime() == qs.getObjCLifetime() || !hasObjCLifetime() || !qs.hasObjCLifetime()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 464, __PRETTY_FUNCTION__))
464 !hasObjCLifetime() || !qs.hasObjCLifetime())((getObjCLifetime() == qs.getObjCLifetime() || !hasObjCLifetime
() || !qs.hasObjCLifetime()) ? static_cast<void> (0) : __assert_fail
("getObjCLifetime() == qs.getObjCLifetime() || !hasObjCLifetime() || !qs.hasObjCLifetime()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 464, __PRETTY_FUNCTION__))
;
465 Mask |= qs.Mask;
466 }
467
468 /// Returns true if address space A is equal to or a superset of B.
469 /// OpenCL v2.0 defines conversion rules (OpenCLC v2.0 s6.5.5) and notion of
470 /// overlapping address spaces.
471 /// CL1.1 or CL1.2:
472 /// every address space is a superset of itself.
473 /// CL2.0 adds:
474 /// __generic is a superset of any address space except for __constant.
475 static bool isAddressSpaceSupersetOf(LangAS A, LangAS B) {
476 // Address spaces must match exactly.
477 return A == B ||
478 // Otherwise in OpenCLC v2.0 s6.5.5: every address space except
479 // for __constant can be used as __generic.
480 (A == LangAS::opencl_generic && B != LangAS::opencl_constant) ||
481 // Consider pointer size address spaces to be equivalent to default.
482 ((isPtrSizeAddressSpace(A) || A == LangAS::Default) &&
483 (isPtrSizeAddressSpace(B) || B == LangAS::Default));
484 }
485
486 /// Returns true if the address space in these qualifiers is equal to or
487 /// a superset of the address space in the argument qualifiers.
488 bool isAddressSpaceSupersetOf(Qualifiers other) const {
489 return isAddressSpaceSupersetOf(getAddressSpace(), other.getAddressSpace());
490 }
491
492 /// Determines if these qualifiers compatibly include another set.
493 /// Generally this answers the question of whether an object with the other
494 /// qualifiers can be safely used as an object with these qualifiers.
495 bool compatiblyIncludes(Qualifiers other) const {
496 return isAddressSpaceSupersetOf(other) &&
497 // ObjC GC qualifiers can match, be added, or be removed, but can't
498 // be changed.
499 (getObjCGCAttr() == other.getObjCGCAttr() || !hasObjCGCAttr() ||
500 !other.hasObjCGCAttr()) &&
501 // ObjC lifetime qualifiers must match exactly.
502 getObjCLifetime() == other.getObjCLifetime() &&
503 // CVR qualifiers may subset.
504 (((Mask & CVRMask) | (other.Mask & CVRMask)) == (Mask & CVRMask)) &&
505 // U qualifier may superset.
506 (!other.hasUnaligned() || hasUnaligned());
507 }
508
509 /// Determines if these qualifiers compatibly include another set of
510 /// qualifiers from the narrow perspective of Objective-C ARC lifetime.
511 ///
512 /// One set of Objective-C lifetime qualifiers compatibly includes the other
513 /// if the lifetime qualifiers match, or if both are non-__weak and the
514 /// including set also contains the 'const' qualifier, or both are non-__weak
515 /// and one is None (which can only happen in non-ARC modes).
516 bool compatiblyIncludesObjCLifetime(Qualifiers other) const {
517 if (getObjCLifetime() == other.getObjCLifetime())
518 return true;
519
520 if (getObjCLifetime() == OCL_Weak || other.getObjCLifetime() == OCL_Weak)
521 return false;
522
523 if (getObjCLifetime() == OCL_None || other.getObjCLifetime() == OCL_None)
524 return true;
525
526 return hasConst();
527 }
528
529 /// Determine whether this set of qualifiers is a strict superset of
530 /// another set of qualifiers, not considering qualifier compatibility.
531 bool isStrictSupersetOf(Qualifiers Other) const;
532
533 bool operator==(Qualifiers Other) const { return Mask == Other.Mask; }
534 bool operator!=(Qualifiers Other) const { return Mask != Other.Mask; }
535
536 explicit operator bool() const { return hasQualifiers(); }
537
538 Qualifiers &operator+=(Qualifiers R) {
539 addQualifiers(R);
540 return *this;
541 }
542
543 // Union two qualifier sets. If an enumerated qualifier appears
544 // in both sets, use the one from the right.
545 friend Qualifiers operator+(Qualifiers L, Qualifiers R) {
546 L += R;
547 return L;
548 }
549
550 Qualifiers &operator-=(Qualifiers R) {
551 removeQualifiers(R);
552 return *this;
553 }
554
555 /// Compute the difference between two qualifier sets.
556 friend Qualifiers operator-(Qualifiers L, Qualifiers R) {
557 L -= R;
558 return L;
559 }
560
561 std::string getAsString() const;
562 std::string getAsString(const PrintingPolicy &Policy) const;
563
564 static std::string getAddrSpaceAsString(LangAS AS);
565
566 bool isEmptyWhenPrinted(const PrintingPolicy &Policy) const;
567 void print(raw_ostream &OS, const PrintingPolicy &Policy,
568 bool appendSpaceIfNonEmpty = false) const;
569
570 void Profile(llvm::FoldingSetNodeID &ID) const {
571 ID.AddInteger(Mask);
572 }
573
574private:
575 // bits: |0 1 2|3|4 .. 5|6 .. 8|9 ... 31|
576 // |C R V|U|GCAttr|Lifetime|AddressSpace|
577 uint32_t Mask = 0;
578
579 static const uint32_t UMask = 0x8;
580 static const uint32_t UShift = 3;
581 static const uint32_t GCAttrMask = 0x30;
582 static const uint32_t GCAttrShift = 4;
583 static const uint32_t LifetimeMask = 0x1C0;
584 static const uint32_t LifetimeShift = 6;
585 static const uint32_t AddressSpaceMask =
586 ~(CVRMask | UMask | GCAttrMask | LifetimeMask);
587 static const uint32_t AddressSpaceShift = 9;
588};
589
590/// A std::pair-like structure for storing a qualified type split
591/// into its local qualifiers and its locally-unqualified type.
592struct SplitQualType {
593 /// The locally-unqualified type.
594 const Type *Ty = nullptr;
595
596 /// The local qualifiers.
597 Qualifiers Quals;
598
599 SplitQualType() = default;
600 SplitQualType(const Type *ty, Qualifiers qs) : Ty(ty), Quals(qs) {}
601
602 SplitQualType getSingleStepDesugaredType() const; // end of this file
603
604 // Make std::tie work.
605 std::pair<const Type *,Qualifiers> asPair() const {
606 return std::pair<const Type *, Qualifiers>(Ty, Quals);
607 }
608
609 friend bool operator==(SplitQualType a, SplitQualType b) {
610 return a.Ty == b.Ty && a.Quals == b.Quals;
611 }
612 friend bool operator!=(SplitQualType a, SplitQualType b) {
613 return a.Ty != b.Ty || a.Quals != b.Quals;
614 }
615};
616
617/// The kind of type we are substituting Objective-C type arguments into.
618///
619/// The kind of substitution affects the replacement of type parameters when
620/// no concrete type information is provided, e.g., when dealing with an
621/// unspecialized type.
622enum class ObjCSubstitutionContext {
623 /// An ordinary type.
624 Ordinary,
625
626 /// The result type of a method or function.
627 Result,
628
629 /// The parameter type of a method or function.
630 Parameter,
631
632 /// The type of a property.
633 Property,
634
635 /// The superclass of a type.
636 Superclass,
637};
638
639/// A (possibly-)qualified type.
640///
641/// For efficiency, we don't store CV-qualified types as nodes on their
642/// own: instead each reference to a type stores the qualifiers. This
643/// greatly reduces the number of nodes we need to allocate for types (for
644/// example we only need one for 'int', 'const int', 'volatile int',
645/// 'const volatile int', etc).
646///
647/// As an added efficiency bonus, instead of making this a pair, we
648/// just store the two bits we care about in the low bits of the
649/// pointer. To handle the packing/unpacking, we make QualType be a
650/// simple wrapper class that acts like a smart pointer. A third bit
651/// indicates whether there are extended qualifiers present, in which
652/// case the pointer points to a special structure.
653class QualType {
654 friend class QualifierCollector;
655
656 // Thankfully, these are efficiently composable.
657 llvm::PointerIntPair<llvm::PointerUnion<const Type *, const ExtQuals *>,
658 Qualifiers::FastWidth> Value;
659
660 const ExtQuals *getExtQualsUnsafe() const {
661 return Value.getPointer().get<const ExtQuals*>();
662 }
663
664 const Type *getTypePtrUnsafe() const {
665 return Value.getPointer().get<const Type*>();
666 }
667
668 const ExtQualsTypeCommonBase *getCommonPtr() const {
669 assert(!isNull() && "Cannot retrieve a NULL type pointer")((!isNull() && "Cannot retrieve a NULL type pointer")
? static_cast<void> (0) : __assert_fail ("!isNull() && \"Cannot retrieve a NULL type pointer\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 669, __PRETTY_FUNCTION__))
;
670 auto CommonPtrVal = reinterpret_cast<uintptr_t>(Value.getOpaqueValue());
671 CommonPtrVal &= ~(uintptr_t)((1 << TypeAlignmentInBits) - 1);
672 return reinterpret_cast<ExtQualsTypeCommonBase*>(CommonPtrVal);
673 }
674
675public:
676 QualType() = default;
677 QualType(const Type *Ptr, unsigned Quals) : Value(Ptr, Quals) {}
678 QualType(const ExtQuals *Ptr, unsigned Quals) : Value(Ptr, Quals) {}
679
680 unsigned getLocalFastQualifiers() const { return Value.getInt(); }
681 void setLocalFastQualifiers(unsigned Quals) { Value.setInt(Quals); }
682
683 /// Retrieves a pointer to the underlying (unqualified) type.
684 ///
685 /// This function requires that the type not be NULL. If the type might be
686 /// NULL, use the (slightly less efficient) \c getTypePtrOrNull().
687 const Type *getTypePtr() const;
688
689 const Type *getTypePtrOrNull() const;
690
691 /// Retrieves a pointer to the name of the base type.
692 const IdentifierInfo *getBaseTypeIdentifier() const;
693
694 /// Divides a QualType into its unqualified type and a set of local
695 /// qualifiers.
696 SplitQualType split() const;
697
698 void *getAsOpaquePtr() const { return Value.getOpaqueValue(); }
699
700 static QualType getFromOpaquePtr(const void *Ptr) {
701 QualType T;
702 T.Value.setFromOpaqueValue(const_cast<void*>(Ptr));
703 return T;
704 }
705
706 const Type &operator*() const {
707 return *getTypePtr();
708 }
709
710 const Type *operator->() const {
711 return getTypePtr();
712 }
713
714 bool isCanonical() const;
715 bool isCanonicalAsParam() const;
716
717 /// Return true if this QualType doesn't point to a type yet.
718 bool isNull() const {
719 return Value.getPointer().isNull();
43
Calling 'PointerUnion::isNull'
54
Returning from 'PointerUnion::isNull'
55
Returning the value 1, which participates in a condition later
720 }
721
722 /// Determine whether this particular QualType instance has the
723 /// "const" qualifier set, without looking through typedefs that may have
724 /// added "const" at a different level.
725 bool isLocalConstQualified() const {
726 return (getLocalFastQualifiers() & Qualifiers::Const);
727 }
728
729 /// Determine whether this type is const-qualified.
730 bool isConstQualified() const;
731
732 /// Determine whether this particular QualType instance has the
733 /// "restrict" qualifier set, without looking through typedefs that may have
734 /// added "restrict" at a different level.
735 bool isLocalRestrictQualified() const {
736 return (getLocalFastQualifiers() & Qualifiers::Restrict);
737 }
738
739 /// Determine whether this type is restrict-qualified.
740 bool isRestrictQualified() const;
741
742 /// Determine whether this particular QualType instance has the
743 /// "volatile" qualifier set, without looking through typedefs that may have
744 /// added "volatile" at a different level.
745 bool isLocalVolatileQualified() const {
746 return (getLocalFastQualifiers() & Qualifiers::Volatile);
747 }
748
749 /// Determine whether this type is volatile-qualified.
750 bool isVolatileQualified() const;
751
752 /// Determine whether this particular QualType instance has any
753 /// qualifiers, without looking through any typedefs that might add
754 /// qualifiers at a different level.
755 bool hasLocalQualifiers() const {
756 return getLocalFastQualifiers() || hasLocalNonFastQualifiers();
757 }
758
759 /// Determine whether this type has any qualifiers.
760 bool hasQualifiers() const;
761
762 /// Determine whether this particular QualType instance has any
763 /// "non-fast" qualifiers, e.g., those that are stored in an ExtQualType
764 /// instance.
765 bool hasLocalNonFastQualifiers() const {
766 return Value.getPointer().is<const ExtQuals*>();
767 }
768
769 /// Retrieve the set of qualifiers local to this particular QualType
770 /// instance, not including any qualifiers acquired through typedefs or
771 /// other sugar.
772 Qualifiers getLocalQualifiers() const;
773
774 /// Retrieve the set of qualifiers applied to this type.
775 Qualifiers getQualifiers() const;
776
777 /// Retrieve the set of CVR (const-volatile-restrict) qualifiers
778 /// local to this particular QualType instance, not including any qualifiers
779 /// acquired through typedefs or other sugar.
780 unsigned getLocalCVRQualifiers() const {
781 return getLocalFastQualifiers();
782 }
783
784 /// Retrieve the set of CVR (const-volatile-restrict) qualifiers
785 /// applied to this type.
786 unsigned getCVRQualifiers() const;
787
788 bool isConstant(const ASTContext& Ctx) const {
789 return QualType::isConstant(*this, Ctx);
790 }
791
792 /// Determine whether this is a Plain Old Data (POD) type (C++ 3.9p10).
793 bool isPODType(const ASTContext &Context) const;
794
795 /// Return true if this is a POD type according to the rules of the C++98
796 /// standard, regardless of the current compilation's language.
797 bool isCXX98PODType(const ASTContext &Context) const;
798
799 /// Return true if this is a POD type according to the more relaxed rules
800 /// of the C++11 standard, regardless of the current compilation's language.
801 /// (C++0x [basic.types]p9). Note that, unlike
802 /// CXXRecordDecl::isCXX11StandardLayout, this takes DRs into account.
803 bool isCXX11PODType(const ASTContext &Context) const;
804
805 /// Return true if this is a trivial type per (C++0x [basic.types]p9)
806 bool isTrivialType(const ASTContext &Context) const;
807
808 /// Return true if this is a trivially copyable type (C++0x [basic.types]p9)
809 bool isTriviallyCopyableType(const ASTContext &Context) const;
810
811
812 /// Returns true if it is a class and it might be dynamic.
813 bool mayBeDynamicClass() const;
814
815 /// Returns true if it is not a class or if the class might not be dynamic.
816 bool mayBeNotDynamicClass() const;
817
818 // Don't promise in the API that anything besides 'const' can be
819 // easily added.
820
821 /// Add the `const` type qualifier to this QualType.
822 void addConst() {
823 addFastQualifiers(Qualifiers::Const);
824 }
825 QualType withConst() const {
826 return withFastQualifiers(Qualifiers::Const);
827 }
828
829 /// Add the `volatile` type qualifier to this QualType.
830 void addVolatile() {
831 addFastQualifiers(Qualifiers::Volatile);
832 }
833 QualType withVolatile() const {
834 return withFastQualifiers(Qualifiers::Volatile);
835 }
836
837 /// Add the `restrict` qualifier to this QualType.
838 void addRestrict() {
839 addFastQualifiers(Qualifiers::Restrict);
840 }
841 QualType withRestrict() const {
842 return withFastQualifiers(Qualifiers::Restrict);
843 }
844
845 QualType withCVRQualifiers(unsigned CVR) const {
846 return withFastQualifiers(CVR);
847 }
848
849 void addFastQualifiers(unsigned TQs) {
850 assert(!(TQs & ~Qualifiers::FastMask)((!(TQs & ~Qualifiers::FastMask) && "non-fast qualifier bits set in mask!"
) ? static_cast<void> (0) : __assert_fail ("!(TQs & ~Qualifiers::FastMask) && \"non-fast qualifier bits set in mask!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 851, __PRETTY_FUNCTION__))
851 && "non-fast qualifier bits set in mask!")((!(TQs & ~Qualifiers::FastMask) && "non-fast qualifier bits set in mask!"
) ? static_cast<void> (0) : __assert_fail ("!(TQs & ~Qualifiers::FastMask) && \"non-fast qualifier bits set in mask!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 851, __PRETTY_FUNCTION__))
;
852 Value.setInt(Value.getInt() | TQs);
853 }
854
855 void removeLocalConst();
856 void removeLocalVolatile();
857 void removeLocalRestrict();
858 void removeLocalCVRQualifiers(unsigned Mask);
859
860 void removeLocalFastQualifiers() { Value.setInt(0); }
861 void removeLocalFastQualifiers(unsigned Mask) {
862 assert(!(Mask & ~Qualifiers::FastMask) && "mask has non-fast qualifiers")((!(Mask & ~Qualifiers::FastMask) && "mask has non-fast qualifiers"
) ? static_cast<void> (0) : __assert_fail ("!(Mask & ~Qualifiers::FastMask) && \"mask has non-fast qualifiers\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 862, __PRETTY_FUNCTION__))
;
863 Value.setInt(Value.getInt() & ~Mask);
864 }
865
866 // Creates a type with the given qualifiers in addition to any
867 // qualifiers already on this type.
868 QualType withFastQualifiers(unsigned TQs) const {
869 QualType T = *this;
870 T.addFastQualifiers(TQs);
871 return T;
872 }
873
874 // Creates a type with exactly the given fast qualifiers, removing
875 // any existing fast qualifiers.
876 QualType withExactLocalFastQualifiers(unsigned TQs) const {
877 return withoutLocalFastQualifiers().withFastQualifiers(TQs);
878 }
879
880 // Removes fast qualifiers, but leaves any extended qualifiers in place.
881 QualType withoutLocalFastQualifiers() const {
882 QualType T = *this;
883 T.removeLocalFastQualifiers();
884 return T;
885 }
886
887 QualType getCanonicalType() const;
888
889 /// Return this type with all of the instance-specific qualifiers
890 /// removed, but without removing any qualifiers that may have been applied
891 /// through typedefs.
892 QualType getLocalUnqualifiedType() const { return QualType(getTypePtr(), 0); }
893
894 /// Retrieve the unqualified variant of the given type,
895 /// removing as little sugar as possible.
896 ///
897 /// This routine looks through various kinds of sugar to find the
898 /// least-desugared type that is unqualified. For example, given:
899 ///
900 /// \code
901 /// typedef int Integer;
902 /// typedef const Integer CInteger;
903 /// typedef CInteger DifferenceType;
904 /// \endcode
905 ///
906 /// Executing \c getUnqualifiedType() on the type \c DifferenceType will
907 /// desugar until we hit the type \c Integer, which has no qualifiers on it.
908 ///
909 /// The resulting type might still be qualified if it's sugar for an array
910 /// type. To strip qualifiers even from within a sugared array type, use
911 /// ASTContext::getUnqualifiedArrayType.
912 inline QualType getUnqualifiedType() const;
913
914 /// Retrieve the unqualified variant of the given type, removing as little
915 /// sugar as possible.
916 ///
917 /// Like getUnqualifiedType(), but also returns the set of
918 /// qualifiers that were built up.
919 ///
920 /// The resulting type might still be qualified if it's sugar for an array
921 /// type. To strip qualifiers even from within a sugared array type, use
922 /// ASTContext::getUnqualifiedArrayType.
923 inline SplitQualType getSplitUnqualifiedType() const;
924
925 /// Determine whether this type is more qualified than the other
926 /// given type, requiring exact equality for non-CVR qualifiers.
927 bool isMoreQualifiedThan(QualType Other) const;
928
929 /// Determine whether this type is at least as qualified as the other
930 /// given type, requiring exact equality for non-CVR qualifiers.
931 bool isAtLeastAsQualifiedAs(QualType Other) const;
932
933 QualType getNonReferenceType() const;
934
935 /// Determine the type of a (typically non-lvalue) expression with the
936 /// specified result type.
937 ///
938 /// This routine should be used for expressions for which the return type is
939 /// explicitly specified (e.g., in a cast or call) and isn't necessarily
940 /// an lvalue. It removes a top-level reference (since there are no
941 /// expressions of reference type) and deletes top-level cvr-qualifiers
942 /// from non-class types (in C++) or all types (in C).
943 QualType getNonLValueExprType(const ASTContext &Context) const;
944
945 /// Return the specified type with any "sugar" removed from
946 /// the type. This takes off typedefs, typeof's etc. If the outer level of
947 /// the type is already concrete, it returns it unmodified. This is similar
948 /// to getting the canonical type, but it doesn't remove *all* typedefs. For
949 /// example, it returns "T*" as "T*", (not as "int*"), because the pointer is
950 /// concrete.
951 ///
952 /// Qualifiers are left in place.
953 QualType getDesugaredType(const ASTContext &Context) const {
954 return getDesugaredType(*this, Context);
955 }
956
957 SplitQualType getSplitDesugaredType() const {
958 return getSplitDesugaredType(*this);
959 }
960
961 /// Return the specified type with one level of "sugar" removed from
962 /// the type.
963 ///
964 /// This routine takes off the first typedef, typeof, etc. If the outer level
965 /// of the type is already concrete, it returns it unmodified.
966 QualType getSingleStepDesugaredType(const ASTContext &Context) const {
967 return getSingleStepDesugaredTypeImpl(*this, Context);
968 }
969
970 /// Returns the specified type after dropping any
971 /// outer-level parentheses.
972 QualType IgnoreParens() const {
973 if (isa<ParenType>(*this))
974 return QualType::IgnoreParens(*this);
975 return *this;
976 }
977
978 /// Indicate whether the specified types and qualifiers are identical.
979 friend bool operator==(const QualType &LHS, const QualType &RHS) {
980 return LHS.Value == RHS.Value;
981 }
982 friend bool operator!=(const QualType &LHS, const QualType &RHS) {
983 return LHS.Value != RHS.Value;
984 }
985 friend bool operator<(const QualType &LHS, const QualType &RHS) {
986 return LHS.Value < RHS.Value;
987 }
988
989 static std::string getAsString(SplitQualType split,
990 const PrintingPolicy &Policy) {
991 return getAsString(split.Ty, split.Quals, Policy);
992 }
993 static std::string getAsString(const Type *ty, Qualifiers qs,
994 const PrintingPolicy &Policy);
995
996 std::string getAsString() const;
997 std::string getAsString(const PrintingPolicy &Policy) const;
998
999 void print(raw_ostream &OS, const PrintingPolicy &Policy,
1000 const Twine &PlaceHolder = Twine(),
1001 unsigned Indentation = 0) const;
1002
1003 static void print(SplitQualType split, raw_ostream &OS,
1004 const PrintingPolicy &policy, const Twine &PlaceHolder,
1005 unsigned Indentation = 0) {
1006 return print(split.Ty, split.Quals, OS, policy, PlaceHolder, Indentation);
1007 }
1008
1009 static void print(const Type *ty, Qualifiers qs,
1010 raw_ostream &OS, const PrintingPolicy &policy,
1011 const Twine &PlaceHolder,
1012 unsigned Indentation = 0);
1013
1014 void getAsStringInternal(std::string &Str,
1015 const PrintingPolicy &Policy) const;
1016
1017 static void getAsStringInternal(SplitQualType split, std::string &out,
1018 const PrintingPolicy &policy) {
1019 return getAsStringInternal(split.Ty, split.Quals, out, policy);
1020 }
1021
1022 static void getAsStringInternal(const Type *ty, Qualifiers qs,
1023 std::string &out,
1024 const PrintingPolicy &policy);
1025
1026 class StreamedQualTypeHelper {
1027 const QualType &T;
1028 const PrintingPolicy &Policy;
1029 const Twine &PlaceHolder;
1030 unsigned Indentation;
1031
1032 public:
1033 StreamedQualTypeHelper(const QualType &T, const PrintingPolicy &Policy,
1034 const Twine &PlaceHolder, unsigned Indentation)
1035 : T(T), Policy(Policy), PlaceHolder(PlaceHolder),
1036 Indentation(Indentation) {}
1037
1038 friend raw_ostream &operator<<(raw_ostream &OS,
1039 const StreamedQualTypeHelper &SQT) {
1040 SQT.T.print(OS, SQT.Policy, SQT.PlaceHolder, SQT.Indentation);
1041 return OS;
1042 }
1043 };
1044
1045 StreamedQualTypeHelper stream(const PrintingPolicy &Policy,
1046 const Twine &PlaceHolder = Twine(),
1047 unsigned Indentation = 0) const {
1048 return StreamedQualTypeHelper(*this, Policy, PlaceHolder, Indentation);
1049 }
1050
1051 void dump(const char *s) const;
1052 void dump() const;
1053 void dump(llvm::raw_ostream &OS) const;
1054
1055 void Profile(llvm::FoldingSetNodeID &ID) const {
1056 ID.AddPointer(getAsOpaquePtr());
1057 }
1058
1059 /// Check if this type has any address space qualifier.
1060 inline bool hasAddressSpace() const;
1061
1062 /// Return the address space of this type.
1063 inline LangAS getAddressSpace() const;
1064
1065 /// Returns gc attribute of this type.
1066 inline Qualifiers::GC getObjCGCAttr() const;
1067
1068 /// true when Type is objc's weak.
1069 bool isObjCGCWeak() const {
1070 return getObjCGCAttr() == Qualifiers::Weak;
1071 }
1072
1073 /// true when Type is objc's strong.
1074 bool isObjCGCStrong() const {
1075 return getObjCGCAttr() == Qualifiers::Strong;
1076 }
1077
1078 /// Returns lifetime attribute of this type.
1079 Qualifiers::ObjCLifetime getObjCLifetime() const {
1080 return getQualifiers().getObjCLifetime();
1081 }
1082
1083 bool hasNonTrivialObjCLifetime() const {
1084 return getQualifiers().hasNonTrivialObjCLifetime();
1085 }
1086
1087 bool hasStrongOrWeakObjCLifetime() const {
1088 return getQualifiers().hasStrongOrWeakObjCLifetime();
1089 }
1090
1091 // true when Type is objc's weak and weak is enabled but ARC isn't.
1092 bool isNonWeakInMRRWithObjCWeak(const ASTContext &Context) const;
1093
1094 enum PrimitiveDefaultInitializeKind {
1095 /// The type does not fall into any of the following categories. Note that
1096 /// this case is zero-valued so that values of this enum can be used as a
1097 /// boolean condition for non-triviality.
1098 PDIK_Trivial,
1099
1100 /// The type is an Objective-C retainable pointer type that is qualified
1101 /// with the ARC __strong qualifier.
1102 PDIK_ARCStrong,
1103
1104 /// The type is an Objective-C retainable pointer type that is qualified
1105 /// with the ARC __weak qualifier.
1106 PDIK_ARCWeak,
1107
1108 /// The type is a struct containing a field whose type is not PCK_Trivial.
1109 PDIK_Struct
1110 };
1111
1112 /// Functions to query basic properties of non-trivial C struct types.
1113
1114 /// Check if this is a non-trivial type that would cause a C struct
1115 /// transitively containing this type to be non-trivial to default initialize
1116 /// and return the kind.
1117 PrimitiveDefaultInitializeKind
1118 isNonTrivialToPrimitiveDefaultInitialize() const;
1119
1120 enum PrimitiveCopyKind {
1121 /// The type does not fall into any of the following categories. Note that
1122 /// this case is zero-valued so that values of this enum can be used as a
1123 /// boolean condition for non-triviality.
1124 PCK_Trivial,
1125
1126 /// The type would be trivial except that it is volatile-qualified. Types
1127 /// that fall into one of the other non-trivial cases may additionally be
1128 /// volatile-qualified.
1129 PCK_VolatileTrivial,
1130
1131 /// The type is an Objective-C retainable pointer type that is qualified
1132 /// with the ARC __strong qualifier.
1133 PCK_ARCStrong,
1134
1135 /// The type is an Objective-C retainable pointer type that is qualified
1136 /// with the ARC __weak qualifier.
1137 PCK_ARCWeak,
1138
1139 /// The type is a struct containing a field whose type is neither
1140 /// PCK_Trivial nor PCK_VolatileTrivial.
1141 /// Note that a C++ struct type does not necessarily match this; C++ copying
1142 /// semantics are too complex to express here, in part because they depend
1143 /// on the exact constructor or assignment operator that is chosen by
1144 /// overload resolution to do the copy.
1145 PCK_Struct
1146 };
1147
1148 /// Check if this is a non-trivial type that would cause a C struct
1149 /// transitively containing this type to be non-trivial to copy and return the
1150 /// kind.
1151 PrimitiveCopyKind isNonTrivialToPrimitiveCopy() const;
1152
1153 /// Check if this is a non-trivial type that would cause a C struct
1154 /// transitively containing this type to be non-trivial to destructively
1155 /// move and return the kind. Destructive move in this context is a C++-style
1156 /// move in which the source object is placed in a valid but unspecified state
1157 /// after it is moved, as opposed to a truly destructive move in which the
1158 /// source object is placed in an uninitialized state.
1159 PrimitiveCopyKind isNonTrivialToPrimitiveDestructiveMove() const;
1160
1161 enum DestructionKind {
1162 DK_none,
1163 DK_cxx_destructor,
1164 DK_objc_strong_lifetime,
1165 DK_objc_weak_lifetime,
1166 DK_nontrivial_c_struct
1167 };
1168
1169 /// Returns a nonzero value if objects of this type require
1170 /// non-trivial work to clean up after. Non-zero because it's
1171 /// conceivable that qualifiers (objc_gc(weak)?) could make
1172 /// something require destruction.
1173 DestructionKind isDestructedType() const {
1174 return isDestructedTypeImpl(*this);
1175 }
1176
1177 /// Check if this is or contains a C union that is non-trivial to
1178 /// default-initialize, which is a union that has a member that is non-trivial
1179 /// to default-initialize. If this returns true,
1180 /// isNonTrivialToPrimitiveDefaultInitialize returns PDIK_Struct.
1181 bool hasNonTrivialToPrimitiveDefaultInitializeCUnion() const;
1182
1183 /// Check if this is or contains a C union that is non-trivial to destruct,
1184 /// which is a union that has a member that is non-trivial to destruct. If
1185 /// this returns true, isDestructedType returns DK_nontrivial_c_struct.
1186 bool hasNonTrivialToPrimitiveDestructCUnion() const;
1187
1188 /// Check if this is or contains a C union that is non-trivial to copy, which
1189 /// is a union that has a member that is non-trivial to copy. If this returns
1190 /// true, isNonTrivialToPrimitiveCopy returns PCK_Struct.
1191 bool hasNonTrivialToPrimitiveCopyCUnion() const;
1192
1193 /// Determine whether expressions of the given type are forbidden
1194 /// from being lvalues in C.
1195 ///
1196 /// The expression types that are forbidden to be lvalues are:
1197 /// - 'void', but not qualified void
1198 /// - function types
1199 ///
1200 /// The exact rule here is C99 6.3.2.1:
1201 /// An lvalue is an expression with an object type or an incomplete
1202 /// type other than void.
1203 bool isCForbiddenLValueType() const;
1204
1205 /// Substitute type arguments for the Objective-C type parameters used in the
1206 /// subject type.
1207 ///
1208 /// \param ctx ASTContext in which the type exists.
1209 ///
1210 /// \param typeArgs The type arguments that will be substituted for the
1211 /// Objective-C type parameters in the subject type, which are generally
1212 /// computed via \c Type::getObjCSubstitutions. If empty, the type
1213 /// parameters will be replaced with their bounds or id/Class, as appropriate
1214 /// for the context.
1215 ///
1216 /// \param context The context in which the subject type was written.
1217 ///
1218 /// \returns the resulting type.
1219 QualType substObjCTypeArgs(ASTContext &ctx,
1220 ArrayRef<QualType> typeArgs,
1221 ObjCSubstitutionContext context) const;
1222
1223 /// Substitute type arguments from an object type for the Objective-C type
1224 /// parameters used in the subject type.
1225 ///
1226 /// This operation combines the computation of type arguments for
1227 /// substitution (\c Type::getObjCSubstitutions) with the actual process of
1228 /// substitution (\c QualType::substObjCTypeArgs) for the convenience of
1229 /// callers that need to perform a single substitution in isolation.
1230 ///
1231 /// \param objectType The type of the object whose member type we're
1232 /// substituting into. For example, this might be the receiver of a message
1233 /// or the base of a property access.
1234 ///
1235 /// \param dc The declaration context from which the subject type was
1236 /// retrieved, which indicates (for example) which type parameters should
1237 /// be substituted.
1238 ///
1239 /// \param context The context in which the subject type was written.
1240 ///
1241 /// \returns the subject type after replacing all of the Objective-C type
1242 /// parameters with their corresponding arguments.
1243 QualType substObjCMemberType(QualType objectType,
1244 const DeclContext *dc,
1245 ObjCSubstitutionContext context) const;
1246
1247 /// Strip Objective-C "__kindof" types from the given type.
1248 QualType stripObjCKindOfType(const ASTContext &ctx) const;
1249
1250 /// Remove all qualifiers including _Atomic.
1251 QualType getAtomicUnqualifiedType() const;
1252
1253private:
1254 // These methods are implemented in a separate translation unit;
1255 // "static"-ize them to avoid creating temporary QualTypes in the
1256 // caller.
1257 static bool isConstant(QualType T, const ASTContext& Ctx);
1258 static QualType getDesugaredType(QualType T, const ASTContext &Context);
1259 static SplitQualType getSplitDesugaredType(QualType T);
1260 static SplitQualType getSplitUnqualifiedTypeImpl(QualType type);
1261 static QualType getSingleStepDesugaredTypeImpl(QualType type,
1262 const ASTContext &C);
1263 static QualType IgnoreParens(QualType T);
1264 static DestructionKind isDestructedTypeImpl(QualType type);
1265
1266 /// Check if \param RD is or contains a non-trivial C union.
1267 static bool hasNonTrivialToPrimitiveDefaultInitializeCUnion(const RecordDecl *RD);
1268 static bool hasNonTrivialToPrimitiveDestructCUnion(const RecordDecl *RD);
1269 static bool hasNonTrivialToPrimitiveCopyCUnion(const RecordDecl *RD);
1270};
1271
1272} // namespace clang
1273
1274namespace llvm {
1275
1276/// Implement simplify_type for QualType, so that we can dyn_cast from QualType
1277/// to a specific Type class.
1278template<> struct simplify_type< ::clang::QualType> {
1279 using SimpleType = const ::clang::Type *;
1280
1281 static SimpleType getSimplifiedValue(::clang::QualType Val) {
1282 return Val.getTypePtr();
1283 }
1284};
1285
1286// Teach SmallPtrSet that QualType is "basically a pointer".
1287template<>
1288struct PointerLikeTypeTraits<clang::QualType> {
1289 static inline void *getAsVoidPointer(clang::QualType P) {
1290 return P.getAsOpaquePtr();
1291 }
1292
1293 static inline clang::QualType getFromVoidPointer(void *P) {
1294 return clang::QualType::getFromOpaquePtr(P);
1295 }
1296
1297 // Various qualifiers go in low bits.
1298 enum { NumLowBitsAvailable = 0 };
1299};
1300
1301} // namespace llvm
1302
1303namespace clang {
1304
1305/// Base class that is common to both the \c ExtQuals and \c Type
1306/// classes, which allows \c QualType to access the common fields between the
1307/// two.
1308class ExtQualsTypeCommonBase {
1309 friend class ExtQuals;
1310 friend class QualType;
1311 friend class Type;
1312
1313 /// The "base" type of an extended qualifiers type (\c ExtQuals) or
1314 /// a self-referential pointer (for \c Type).
1315 ///
1316 /// This pointer allows an efficient mapping from a QualType to its
1317 /// underlying type pointer.
1318 const Type *const BaseType;
1319
1320 /// The canonical type of this type. A QualType.
1321 QualType CanonicalType;
1322
1323 ExtQualsTypeCommonBase(const Type *baseType, QualType canon)
1324 : BaseType(baseType), CanonicalType(canon) {}
1325};
1326
1327/// We can encode up to four bits in the low bits of a
1328/// type pointer, but there are many more type qualifiers that we want
1329/// to be able to apply to an arbitrary type. Therefore we have this
1330/// struct, intended to be heap-allocated and used by QualType to
1331/// store qualifiers.
1332///
1333/// The current design tags the 'const', 'restrict', and 'volatile' qualifiers
1334/// in three low bits on the QualType pointer; a fourth bit records whether
1335/// the pointer is an ExtQuals node. The extended qualifiers (address spaces,
1336/// Objective-C GC attributes) are much more rare.
1337class ExtQuals : public ExtQualsTypeCommonBase, public llvm::FoldingSetNode {
1338 // NOTE: changing the fast qualifiers should be straightforward as
1339 // long as you don't make 'const' non-fast.
1340 // 1. Qualifiers:
1341 // a) Modify the bitmasks (Qualifiers::TQ and DeclSpec::TQ).
1342 // Fast qualifiers must occupy the low-order bits.
1343 // b) Update Qualifiers::FastWidth and FastMask.
1344 // 2. QualType:
1345 // a) Update is{Volatile,Restrict}Qualified(), defined inline.
1346 // b) Update remove{Volatile,Restrict}, defined near the end of
1347 // this header.
1348 // 3. ASTContext:
1349 // a) Update get{Volatile,Restrict}Type.
1350
1351 /// The immutable set of qualifiers applied by this node. Always contains
1352 /// extended qualifiers.
1353 Qualifiers Quals;
1354
1355 ExtQuals *this_() { return this; }
1356
1357public:
1358 ExtQuals(const Type *baseType, QualType canon, Qualifiers quals)
1359 : ExtQualsTypeCommonBase(baseType,
1360 canon.isNull() ? QualType(this_(), 0) : canon),
1361 Quals(quals) {
1362 assert(Quals.hasNonFastQualifiers()((Quals.hasNonFastQualifiers() && "ExtQuals created with no fast qualifiers"
) ? static_cast<void> (0) : __assert_fail ("Quals.hasNonFastQualifiers() && \"ExtQuals created with no fast qualifiers\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 1363, __PRETTY_FUNCTION__))
1363 && "ExtQuals created with no fast qualifiers")((Quals.hasNonFastQualifiers() && "ExtQuals created with no fast qualifiers"
) ? static_cast<void> (0) : __assert_fail ("Quals.hasNonFastQualifiers() && \"ExtQuals created with no fast qualifiers\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 1363, __PRETTY_FUNCTION__))
;
1364 assert(!Quals.hasFastQualifiers()((!Quals.hasFastQualifiers() && "ExtQuals created with fast qualifiers"
) ? static_cast<void> (0) : __assert_fail ("!Quals.hasFastQualifiers() && \"ExtQuals created with fast qualifiers\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 1365, __PRETTY_FUNCTION__))
1365 && "ExtQuals created with fast qualifiers")((!Quals.hasFastQualifiers() && "ExtQuals created with fast qualifiers"
) ? static_cast<void> (0) : __assert_fail ("!Quals.hasFastQualifiers() && \"ExtQuals created with fast qualifiers\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 1365, __PRETTY_FUNCTION__))
;
1366 }
1367
1368 Qualifiers getQualifiers() const { return Quals; }
1369
1370 bool hasObjCGCAttr() const { return Quals.hasObjCGCAttr(); }
1371 Qualifiers::GC getObjCGCAttr() const { return Quals.getObjCGCAttr(); }
1372
1373 bool hasObjCLifetime() const { return Quals.hasObjCLifetime(); }
1374 Qualifiers::ObjCLifetime getObjCLifetime() const {
1375 return Quals.getObjCLifetime();
1376 }
1377
1378 bool hasAddressSpace() const { return Quals.hasAddressSpace(); }
1379 LangAS getAddressSpace() const { return Quals.getAddressSpace(); }
1380
1381 const Type *getBaseType() const { return BaseType; }
1382
1383public:
1384 void Profile(llvm::FoldingSetNodeID &ID) const {
1385 Profile(ID, getBaseType(), Quals);
1386 }
1387
1388 static void Profile(llvm::FoldingSetNodeID &ID,
1389 const Type *BaseType,
1390 Qualifiers Quals) {
1391 assert(!Quals.hasFastQualifiers() && "fast qualifiers in ExtQuals hash!")((!Quals.hasFastQualifiers() && "fast qualifiers in ExtQuals hash!"
) ? static_cast<void> (0) : __assert_fail ("!Quals.hasFastQualifiers() && \"fast qualifiers in ExtQuals hash!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 1391, __PRETTY_FUNCTION__))
;
1392 ID.AddPointer(BaseType);
1393 Quals.Profile(ID);
1394 }
1395};
1396
1397/// The kind of C++11 ref-qualifier associated with a function type.
1398/// This determines whether a member function's "this" object can be an
1399/// lvalue, rvalue, or neither.
1400enum RefQualifierKind {
1401 /// No ref-qualifier was provided.
1402 RQ_None = 0,
1403
1404 /// An lvalue ref-qualifier was provided (\c &).
1405 RQ_LValue,
1406
1407 /// An rvalue ref-qualifier was provided (\c &&).
1408 RQ_RValue
1409};
1410
1411/// Which keyword(s) were used to create an AutoType.
1412enum class AutoTypeKeyword {
1413 /// auto
1414 Auto,
1415
1416 /// decltype(auto)
1417 DecltypeAuto,
1418
1419 /// __auto_type (GNU extension)
1420 GNUAutoType
1421};
1422
1423/// The base class of the type hierarchy.
1424///
1425/// A central concept with types is that each type always has a canonical
1426/// type. A canonical type is the type with any typedef names stripped out
1427/// of it or the types it references. For example, consider:
1428///
1429/// typedef int foo;
1430/// typedef foo* bar;
1431/// 'int *' 'foo *' 'bar'
1432///
1433/// There will be a Type object created for 'int'. Since int is canonical, its
1434/// CanonicalType pointer points to itself. There is also a Type for 'foo' (a
1435/// TypedefType). Its CanonicalType pointer points to the 'int' Type. Next
1436/// there is a PointerType that represents 'int*', which, like 'int', is
1437/// canonical. Finally, there is a PointerType type for 'foo*' whose canonical
1438/// type is 'int*', and there is a TypedefType for 'bar', whose canonical type
1439/// is also 'int*'.
1440///
1441/// Non-canonical types are useful for emitting diagnostics, without losing
1442/// information about typedefs being used. Canonical types are useful for type
1443/// comparisons (they allow by-pointer equality tests) and useful for reasoning
1444/// about whether something has a particular form (e.g. is a function type),
1445/// because they implicitly, recursively, strip all typedefs out of a type.
1446///
1447/// Types, once created, are immutable.
1448///
1449class alignas(8) Type : public ExtQualsTypeCommonBase {
1450public:
1451 enum TypeClass {
1452#define TYPE(Class, Base) Class,
1453#define LAST_TYPE(Class) TypeLast = Class
1454#define ABSTRACT_TYPE(Class, Base)
1455#include "clang/AST/TypeNodes.inc"
1456 };
1457
1458private:
1459 /// Bitfields required by the Type class.
1460 class TypeBitfields {
1461 friend class Type;
1462 template <class T> friend class TypePropertyCache;
1463
1464 /// TypeClass bitfield - Enum that specifies what subclass this belongs to.
1465 unsigned TC : 8;
1466
1467 /// Whether this type is a dependent type (C++ [temp.dep.type]).
1468 unsigned Dependent : 1;
1469
1470 /// Whether this type somehow involves a template parameter, even
1471 /// if the resolution of the type does not depend on a template parameter.
1472 unsigned InstantiationDependent : 1;
1473
1474 /// Whether this type is a variably-modified type (C99 6.7.5).
1475 unsigned VariablyModified : 1;
1476
1477 /// Whether this type contains an unexpanded parameter pack
1478 /// (for C++11 variadic templates).
1479 unsigned ContainsUnexpandedParameterPack : 1;
1480
1481 /// True if the cache (i.e. the bitfields here starting with
1482 /// 'Cache') is valid.
1483 mutable unsigned CacheValid : 1;
1484
1485 /// Linkage of this type.
1486 mutable unsigned CachedLinkage : 3;
1487
1488 /// Whether this type involves and local or unnamed types.
1489 mutable unsigned CachedLocalOrUnnamed : 1;
1490
1491 /// Whether this type comes from an AST file.
1492 mutable unsigned FromAST : 1;
1493
1494 bool isCacheValid() const {
1495 return CacheValid;
1496 }
1497
1498 Linkage getLinkage() const {
1499 assert(isCacheValid() && "getting linkage from invalid cache")((isCacheValid() && "getting linkage from invalid cache"
) ? static_cast<void> (0) : __assert_fail ("isCacheValid() && \"getting linkage from invalid cache\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 1499, __PRETTY_FUNCTION__))
;
1500 return static_cast<Linkage>(CachedLinkage);
1501 }
1502
1503 bool hasLocalOrUnnamedType() const {
1504 assert(isCacheValid() && "getting linkage from invalid cache")((isCacheValid() && "getting linkage from invalid cache"
) ? static_cast<void> (0) : __assert_fail ("isCacheValid() && \"getting linkage from invalid cache\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 1504, __PRETTY_FUNCTION__))
;
1505 return CachedLocalOrUnnamed;
1506 }
1507 };
1508 enum { NumTypeBits = 18 };
1509
1510protected:
1511 // These classes allow subclasses to somewhat cleanly pack bitfields
1512 // into Type.
1513
1514 class ArrayTypeBitfields {
1515 friend class ArrayType;
1516
1517 unsigned : NumTypeBits;
1518
1519 /// CVR qualifiers from declarations like
1520 /// 'int X[static restrict 4]'. For function parameters only.
1521 unsigned IndexTypeQuals : 3;
1522
1523 /// Storage class qualifiers from declarations like
1524 /// 'int X[static restrict 4]'. For function parameters only.
1525 /// Actually an ArrayType::ArraySizeModifier.
1526 unsigned SizeModifier : 3;
1527 };
1528
1529 class ConstantArrayTypeBitfields {
1530 friend class ConstantArrayType;
1531
1532 unsigned : NumTypeBits + 3 + 3;
1533
1534 /// Whether we have a stored size expression.
1535 unsigned HasStoredSizeExpr : 1;
1536 };
1537
1538 class BuiltinTypeBitfields {
1539 friend class BuiltinType;
1540
1541 unsigned : NumTypeBits;
1542
1543 /// The kind (BuiltinType::Kind) of builtin type this is.
1544 unsigned Kind : 8;
1545 };
1546
1547 /// FunctionTypeBitfields store various bits belonging to FunctionProtoType.
1548 /// Only common bits are stored here. Additional uncommon bits are stored
1549 /// in a trailing object after FunctionProtoType.
1550 class FunctionTypeBitfields {
1551 friend class FunctionProtoType;
1552 friend class FunctionType;
1553
1554 unsigned : NumTypeBits;
1555
1556 /// Extra information which affects how the function is called, like
1557 /// regparm and the calling convention.
1558 unsigned ExtInfo : 12;
1559
1560 /// The ref-qualifier associated with a \c FunctionProtoType.
1561 ///
1562 /// This is a value of type \c RefQualifierKind.
1563 unsigned RefQualifier : 2;
1564
1565 /// Used only by FunctionProtoType, put here to pack with the
1566 /// other bitfields.
1567 /// The qualifiers are part of FunctionProtoType because...
1568 ///
1569 /// C++ 8.3.5p4: The return type, the parameter type list and the
1570 /// cv-qualifier-seq, [...], are part of the function type.
1571 unsigned FastTypeQuals : Qualifiers::FastWidth;
1572 /// Whether this function has extended Qualifiers.
1573 unsigned HasExtQuals : 1;
1574
1575 /// The number of parameters this function has, not counting '...'.
1576 /// According to [implimits] 8 bits should be enough here but this is
1577 /// somewhat easy to exceed with metaprogramming and so we would like to
1578 /// keep NumParams as wide as reasonably possible.
1579 unsigned NumParams : 16;
1580
1581 /// The type of exception specification this function has.
1582 unsigned ExceptionSpecType : 4;
1583
1584 /// Whether this function has extended parameter information.
1585 unsigned HasExtParameterInfos : 1;
1586
1587 /// Whether the function is variadic.
1588 unsigned Variadic : 1;
1589
1590 /// Whether this function has a trailing return type.
1591 unsigned HasTrailingReturn : 1;
1592 };
1593
1594 class ObjCObjectTypeBitfields {
1595 friend class ObjCObjectType;
1596
1597 unsigned : NumTypeBits;
1598
1599 /// The number of type arguments stored directly on this object type.
1600 unsigned NumTypeArgs : 7;
1601
1602 /// The number of protocols stored directly on this object type.
1603 unsigned NumProtocols : 6;
1604
1605 /// Whether this is a "kindof" type.
1606 unsigned IsKindOf : 1;
1607 };
1608
1609 class ReferenceTypeBitfields {
1610 friend class ReferenceType;
1611
1612 unsigned : NumTypeBits;
1613
1614 /// True if the type was originally spelled with an lvalue sigil.
1615 /// This is never true of rvalue references but can also be false
1616 /// on lvalue references because of C++0x [dcl.typedef]p9,
1617 /// as follows:
1618 ///
1619 /// typedef int &ref; // lvalue, spelled lvalue
1620 /// typedef int &&rvref; // rvalue
1621 /// ref &a; // lvalue, inner ref, spelled lvalue
1622 /// ref &&a; // lvalue, inner ref
1623 /// rvref &a; // lvalue, inner ref, spelled lvalue
1624 /// rvref &&a; // rvalue, inner ref
1625 unsigned SpelledAsLValue : 1;
1626
1627 /// True if the inner type is a reference type. This only happens
1628 /// in non-canonical forms.
1629 unsigned InnerRef : 1;
1630 };
1631
1632 class TypeWithKeywordBitfields {
1633 friend class TypeWithKeyword;
1634
1635 unsigned : NumTypeBits;
1636
1637 /// An ElaboratedTypeKeyword. 8 bits for efficient access.
1638 unsigned Keyword : 8;
1639 };
1640
1641 enum { NumTypeWithKeywordBits = 8 };
1642
1643 class ElaboratedTypeBitfields {
1644 friend class ElaboratedType;
1645
1646 unsigned : NumTypeBits;
1647 unsigned : NumTypeWithKeywordBits;
1648
1649 /// Whether the ElaboratedType has a trailing OwnedTagDecl.
1650 unsigned HasOwnedTagDecl : 1;
1651 };
1652
1653 class VectorTypeBitfields {
1654 friend class VectorType;
1655 friend class DependentVectorType;
1656
1657 unsigned : NumTypeBits;
1658
1659 /// The kind of vector, either a generic vector type or some
1660 /// target-specific vector type such as for AltiVec or Neon.
1661 unsigned VecKind : 3;
1662
1663 /// The number of elements in the vector.
1664 unsigned NumElements : 29 - NumTypeBits;
1665
1666 enum { MaxNumElements = (1 << (29 - NumTypeBits)) - 1 };
1667 };
1668
1669 class AttributedTypeBitfields {
1670 friend class AttributedType;
1671
1672 unsigned : NumTypeBits;
1673
1674 /// An AttributedType::Kind
1675 unsigned AttrKind : 32 - NumTypeBits;
1676 };
1677
1678 class AutoTypeBitfields {
1679 friend class AutoType;
1680
1681 unsigned : NumTypeBits;
1682
1683 /// Was this placeholder type spelled as 'auto', 'decltype(auto)',
1684 /// or '__auto_type'? AutoTypeKeyword value.
1685 unsigned Keyword : 2;
1686 };
1687
1688 class SubstTemplateTypeParmPackTypeBitfields {
1689 friend class SubstTemplateTypeParmPackType;
1690
1691 unsigned : NumTypeBits;
1692
1693 /// The number of template arguments in \c Arguments, which is
1694 /// expected to be able to hold at least 1024 according to [implimits].
1695 /// However as this limit is somewhat easy to hit with template
1696 /// metaprogramming we'd prefer to keep it as large as possible.
1697 /// At the moment it has been left as a non-bitfield since this type
1698 /// safely fits in 64 bits as an unsigned, so there is no reason to
1699 /// introduce the performance impact of a bitfield.
1700 unsigned NumArgs;
1701 };
1702
1703 class TemplateSpecializationTypeBitfields {
1704 friend class TemplateSpecializationType;
1705
1706 unsigned : NumTypeBits;
1707
1708 /// Whether this template specialization type is a substituted type alias.
1709 unsigned TypeAlias : 1;
1710
1711 /// The number of template arguments named in this class template
1712 /// specialization, which is expected to be able to hold at least 1024
1713 /// according to [implimits]. However, as this limit is somewhat easy to
1714 /// hit with template metaprogramming we'd prefer to keep it as large
1715 /// as possible. At the moment it has been left as a non-bitfield since
1716 /// this type safely fits in 64 bits as an unsigned, so there is no reason
1717 /// to introduce the performance impact of a bitfield.
1718 unsigned NumArgs;
1719 };
1720
1721 class DependentTemplateSpecializationTypeBitfields {
1722 friend class DependentTemplateSpecializationType;
1723
1724 unsigned : NumTypeBits;
1725 unsigned : NumTypeWithKeywordBits;
1726
1727 /// The number of template arguments named in this class template
1728 /// specialization, which is expected to be able to hold at least 1024
1729 /// according to [implimits]. However, as this limit is somewhat easy to
1730 /// hit with template metaprogramming we'd prefer to keep it as large
1731 /// as possible. At the moment it has been left as a non-bitfield since
1732 /// this type safely fits in 64 bits as an unsigned, so there is no reason
1733 /// to introduce the performance impact of a bitfield.
1734 unsigned NumArgs;
1735 };
1736
1737 class PackExpansionTypeBitfields {
1738 friend class PackExpansionType;
1739
1740 unsigned : NumTypeBits;
1741
1742 /// The number of expansions that this pack expansion will
1743 /// generate when substituted (+1), which is expected to be able to
1744 /// hold at least 1024 according to [implimits]. However, as this limit
1745 /// is somewhat easy to hit with template metaprogramming we'd prefer to
1746 /// keep it as large as possible. At the moment it has been left as a
1747 /// non-bitfield since this type safely fits in 64 bits as an unsigned, so
1748 /// there is no reason to introduce the performance impact of a bitfield.
1749 ///
1750 /// This field will only have a non-zero value when some of the parameter
1751 /// packs that occur within the pattern have been substituted but others
1752 /// have not.
1753 unsigned NumExpansions;
1754 };
1755
1756 union {
1757 TypeBitfields TypeBits;
1758 ArrayTypeBitfields ArrayTypeBits;
1759 ConstantArrayTypeBitfields ConstantArrayTypeBits;
1760 AttributedTypeBitfields AttributedTypeBits;
1761 AutoTypeBitfields AutoTypeBits;
1762 BuiltinTypeBitfields BuiltinTypeBits;
1763 FunctionTypeBitfields FunctionTypeBits;
1764 ObjCObjectTypeBitfields ObjCObjectTypeBits;
1765 ReferenceTypeBitfields ReferenceTypeBits;
1766 TypeWithKeywordBitfields TypeWithKeywordBits;
1767 ElaboratedTypeBitfields ElaboratedTypeBits;
1768 VectorTypeBitfields VectorTypeBits;
1769 SubstTemplateTypeParmPackTypeBitfields SubstTemplateTypeParmPackTypeBits;
1770 TemplateSpecializationTypeBitfields TemplateSpecializationTypeBits;
1771 DependentTemplateSpecializationTypeBitfields
1772 DependentTemplateSpecializationTypeBits;
1773 PackExpansionTypeBitfields PackExpansionTypeBits;
1774
1775 static_assert(sizeof(TypeBitfields) <= 8,
1776 "TypeBitfields is larger than 8 bytes!");
1777 static_assert(sizeof(ArrayTypeBitfields) <= 8,
1778 "ArrayTypeBitfields is larger than 8 bytes!");
1779 static_assert(sizeof(AttributedTypeBitfields) <= 8,
1780 "AttributedTypeBitfields is larger than 8 bytes!");
1781 static_assert(sizeof(AutoTypeBitfields) <= 8,
1782 "AutoTypeBitfields is larger than 8 bytes!");
1783 static_assert(sizeof(BuiltinTypeBitfields) <= 8,
1784 "BuiltinTypeBitfields is larger than 8 bytes!");
1785 static_assert(sizeof(FunctionTypeBitfields) <= 8,
1786 "FunctionTypeBitfields is larger than 8 bytes!");
1787 static_assert(sizeof(ObjCObjectTypeBitfields) <= 8,
1788 "ObjCObjectTypeBitfields is larger than 8 bytes!");
1789 static_assert(sizeof(ReferenceTypeBitfields) <= 8,
1790 "ReferenceTypeBitfields is larger than 8 bytes!");
1791 static_assert(sizeof(TypeWithKeywordBitfields) <= 8,
1792 "TypeWithKeywordBitfields is larger than 8 bytes!");
1793 static_assert(sizeof(ElaboratedTypeBitfields) <= 8,
1794 "ElaboratedTypeBitfields is larger than 8 bytes!");
1795 static_assert(sizeof(VectorTypeBitfields) <= 8,
1796 "VectorTypeBitfields is larger than 8 bytes!");
1797 static_assert(sizeof(SubstTemplateTypeParmPackTypeBitfields) <= 8,
1798 "SubstTemplateTypeParmPackTypeBitfields is larger"
1799 " than 8 bytes!");
1800 static_assert(sizeof(TemplateSpecializationTypeBitfields) <= 8,
1801 "TemplateSpecializationTypeBitfields is larger"
1802 " than 8 bytes!");
1803 static_assert(sizeof(DependentTemplateSpecializationTypeBitfields) <= 8,
1804 "DependentTemplateSpecializationTypeBitfields is larger"
1805 " than 8 bytes!");
1806 static_assert(sizeof(PackExpansionTypeBitfields) <= 8,
1807 "PackExpansionTypeBitfields is larger than 8 bytes");
1808 };
1809
1810private:
1811 template <class T> friend class TypePropertyCache;
1812
1813 /// Set whether this type comes from an AST file.
1814 void setFromAST(bool V = true) const {
1815 TypeBits.FromAST = V;
1816 }
1817
1818protected:
1819 friend class ASTContext;
1820
1821 Type(TypeClass tc, QualType canon, bool Dependent,
1822 bool InstantiationDependent, bool VariablyModified,
1823 bool ContainsUnexpandedParameterPack)
1824 : ExtQualsTypeCommonBase(this,
1825 canon.isNull() ? QualType(this_(), 0) : canon) {
1826 TypeBits.TC = tc;
1827 TypeBits.Dependent = Dependent;
1828 TypeBits.InstantiationDependent = Dependent || InstantiationDependent;
1829 TypeBits.VariablyModified = VariablyModified;
1830 TypeBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack;
1831 TypeBits.CacheValid = false;
1832 TypeBits.CachedLocalOrUnnamed = false;
1833 TypeBits.CachedLinkage = NoLinkage;
1834 TypeBits.FromAST = false;
1835 }
1836
1837 // silence VC++ warning C4355: 'this' : used in base member initializer list
1838 Type *this_() { return this; }
1839
1840 void setDependent(bool D = true) {
1841 TypeBits.Dependent = D;
1842 if (D)
1843 TypeBits.InstantiationDependent = true;
1844 }
1845
1846 void setInstantiationDependent(bool D = true) {
1847 TypeBits.InstantiationDependent = D; }
1848
1849 void setVariablyModified(bool VM = true) { TypeBits.VariablyModified = VM; }
1850
1851 void setContainsUnexpandedParameterPack(bool PP = true) {
1852 TypeBits.ContainsUnexpandedParameterPack = PP;
1853 }
1854
1855public:
1856 friend class ASTReader;
1857 friend class ASTWriter;
1858 template <class T> friend class serialization::AbstractTypeReader;
1859 template <class T> friend class serialization::AbstractTypeWriter;
1860
1861 Type(const Type &) = delete;
1862 Type(Type &&) = delete;
1863 Type &operator=(const Type &) = delete;
1864 Type &operator=(Type &&) = delete;
1865
1866 TypeClass getTypeClass() const { return static_cast<TypeClass>(TypeBits.TC); }
1867
1868 /// Whether this type comes from an AST file.
1869 bool isFromAST() const { return TypeBits.FromAST; }
1870
1871 /// Whether this type is or contains an unexpanded parameter
1872 /// pack, used to support C++0x variadic templates.
1873 ///
1874 /// A type that contains a parameter pack shall be expanded by the
1875 /// ellipsis operator at some point. For example, the typedef in the
1876 /// following example contains an unexpanded parameter pack 'T':
1877 ///
1878 /// \code
1879 /// template<typename ...T>
1880 /// struct X {
1881 /// typedef T* pointer_types; // ill-formed; T is a parameter pack.
1882 /// };
1883 /// \endcode
1884 ///
1885 /// Note that this routine does not specify which
1886 bool containsUnexpandedParameterPack() const {
1887 return TypeBits.ContainsUnexpandedParameterPack;
1888 }
1889
1890 /// Determines if this type would be canonical if it had no further
1891 /// qualification.
1892 bool isCanonicalUnqualified() const {
1893 return CanonicalType == QualType(this, 0);
1894 }
1895
1896 /// Pull a single level of sugar off of this locally-unqualified type.
1897 /// Users should generally prefer SplitQualType::getSingleStepDesugaredType()
1898 /// or QualType::getSingleStepDesugaredType(const ASTContext&).
1899 QualType getLocallyUnqualifiedSingleStepDesugaredType() const;
1900
1901 /// Types are partitioned into 3 broad categories (C99 6.2.5p1):
1902 /// object types, function types, and incomplete types.
1903
1904 /// Return true if this is an incomplete type.
1905 /// A type that can describe objects, but which lacks information needed to
1906 /// determine its size (e.g. void, or a fwd declared struct). Clients of this
1907 /// routine will need to determine if the size is actually required.
1908 ///
1909 /// Def If non-null, and the type refers to some kind of declaration
1910 /// that can be completed (such as a C struct, C++ class, or Objective-C
1911 /// class), will be set to the declaration.
1912 bool isIncompleteType(NamedDecl **Def = nullptr) const;
1913
1914 /// Return true if this is an incomplete or object
1915 /// type, in other words, not a function type.
1916 bool isIncompleteOrObjectType() const {
1917 return !isFunctionType();
1918 }
1919
1920 /// Determine whether this type is an object type.
1921 bool isObjectType() const {
1922 // C++ [basic.types]p8:
1923 // An object type is a (possibly cv-qualified) type that is not a
1924 // function type, not a reference type, and not a void type.
1925 return !isReferenceType() && !isFunctionType() && !isVoidType();
1926 }
1927
1928 /// Return true if this is a literal type
1929 /// (C++11 [basic.types]p10)
1930 bool isLiteralType(const ASTContext &Ctx) const;
1931
1932 /// Test if this type is a standard-layout type.
1933 /// (C++0x [basic.type]p9)
1934 bool isStandardLayoutType() const;
1935
1936 /// Helper methods to distinguish type categories. All type predicates
1937 /// operate on the canonical type, ignoring typedefs and qualifiers.
1938
1939 /// Returns true if the type is a builtin type.
1940 bool isBuiltinType() const;
1941
1942 /// Test for a particular builtin type.
1943 bool isSpecificBuiltinType(unsigned K) const;
1944
1945 /// Test for a type which does not represent an actual type-system type but
1946 /// is instead used as a placeholder for various convenient purposes within
1947 /// Clang. All such types are BuiltinTypes.
1948 bool isPlaceholderType() const;
1949 const BuiltinType *getAsPlaceholderType() const;
1950
1951 /// Test for a specific placeholder type.
1952 bool isSpecificPlaceholderType(unsigned K) const;
1953
1954 /// Test for a placeholder type other than Overload; see
1955 /// BuiltinType::isNonOverloadPlaceholderType.
1956 bool isNonOverloadPlaceholderType() const;
1957
1958 /// isIntegerType() does *not* include complex integers (a GCC extension).
1959 /// isComplexIntegerType() can be used to test for complex integers.
1960 bool isIntegerType() const; // C99 6.2.5p17 (int, char, bool, enum)
1961 bool isEnumeralType() const;
1962
1963 /// Determine whether this type is a scoped enumeration type.
1964 bool isScopedEnumeralType() const;
1965 bool isBooleanType() const;
1966 bool isCharType() const;
1967 bool isWideCharType() const;
1968 bool isChar8Type() const;
1969 bool isChar16Type() const;
1970 bool isChar32Type() const;
1971 bool isAnyCharacterType() const;
1972 bool isIntegralType(const ASTContext &Ctx) const;
1973
1974 /// Determine whether this type is an integral or enumeration type.
1975 bool isIntegralOrEnumerationType() const;
1976
1977 /// Determine whether this type is an integral or unscoped enumeration type.
1978 bool isIntegralOrUnscopedEnumerationType() const;
1979 bool isUnscopedEnumerationType() const;
1980
1981 /// Floating point categories.
1982 bool isRealFloatingType() const; // C99 6.2.5p10 (float, double, long double)
1983 /// isComplexType() does *not* include complex integers (a GCC extension).
1984 /// isComplexIntegerType() can be used to test for complex integers.
1985 bool isComplexType() const; // C99 6.2.5p11 (complex)
1986 bool isAnyComplexType() const; // C99 6.2.5p11 (complex) + Complex Int.
1987 bool isFloatingType() const; // C99 6.2.5p11 (real floating + complex)
1988 bool isHalfType() const; // OpenCL 6.1.1.1, NEON (IEEE 754-2008 half)
1989 bool isFloat16Type() const; // C11 extension ISO/IEC TS 18661
1990 bool isFloat128Type() const;
1991 bool isRealType() const; // C99 6.2.5p17 (real floating + integer)
1992 bool isArithmeticType() const; // C99 6.2.5p18 (integer + floating)
1993 bool isVoidType() const; // C99 6.2.5p19
1994 bool isScalarType() const; // C99 6.2.5p21 (arithmetic + pointers)
1995 bool isAggregateType() const;
1996 bool isFundamentalType() const;
1997 bool isCompoundType() const;
1998
1999 // Type Predicates: Check to see if this type is structurally the specified
2000 // type, ignoring typedefs and qualifiers.
2001 bool isFunctionType() const;
2002 bool isFunctionNoProtoType() const { return getAs<FunctionNoProtoType>(); }
2003 bool isFunctionProtoType() const { return getAs<FunctionProtoType>(); }
2004 bool isPointerType() const;
2005 bool isAnyPointerType() const; // Any C pointer or ObjC object pointer
2006 bool isBlockPointerType() const;
2007 bool isVoidPointerType() const;
2008 bool isReferenceType() const;
2009 bool isLValueReferenceType() const;
2010 bool isRValueReferenceType() const;
2011 bool isObjectPointerType() const;
2012 bool isFunctionPointerType() const;
2013 bool isFunctionReferenceType() const;
2014 bool isMemberPointerType() const;
2015 bool isMemberFunctionPointerType() const;
2016 bool isMemberDataPointerType() const;
2017 bool isArrayType() const;
2018 bool isConstantArrayType() const;
2019 bool isIncompleteArrayType() const;
2020 bool isVariableArrayType() const;
2021 bool isDependentSizedArrayType() const;
2022 bool isRecordType() const;
2023 bool isClassType() const;
2024 bool isStructureType() const;
2025 bool isObjCBoxableRecordType() const;
2026 bool isInterfaceType() const;
2027 bool isStructureOrClassType() const;
2028 bool isUnionType() const;
2029 bool isComplexIntegerType() const; // GCC _Complex integer type.
2030 bool isVectorType() const; // GCC vector type.
2031 bool isExtVectorType() const; // Extended vector type.
2032 bool isDependentAddressSpaceType() const; // value-dependent address space qualifier
2033 bool isObjCObjectPointerType() const; // pointer to ObjC object
2034 bool isObjCRetainableType() const; // ObjC object or block pointer
2035 bool isObjCLifetimeType() const; // (array of)* retainable type
2036 bool isObjCIndirectLifetimeType() const; // (pointer to)* lifetime type
2037 bool isObjCNSObjectType() const; // __attribute__((NSObject))
2038 bool isObjCIndependentClassType() const; // __attribute__((objc_independent_class))
2039 // FIXME: change this to 'raw' interface type, so we can used 'interface' type
2040 // for the common case.
2041 bool isObjCObjectType() const; // NSString or typeof(*(id)0)
2042 bool isObjCQualifiedInterfaceType() const; // NSString<foo>
2043 bool isObjCQualifiedIdType() const; // id<foo>
2044 bool isObjCQualifiedClassType() const; // Class<foo>
2045 bool isObjCObjectOrInterfaceType() const;
2046 bool isObjCIdType() const; // id
2047 bool isDecltypeType() const;
2048 /// Was this type written with the special inert-in-ARC __unsafe_unretained
2049 /// qualifier?
2050 ///
2051 /// This approximates the answer to the following question: if this
2052 /// translation unit were compiled in ARC, would this type be qualified
2053 /// with __unsafe_unretained?
2054 bool isObjCInertUnsafeUnretainedType() const {
2055 return hasAttr(attr::ObjCInertUnsafeUnretained);
2056 }
2057
2058 /// Whether the type is Objective-C 'id' or a __kindof type of an
2059 /// object type, e.g., __kindof NSView * or __kindof id
2060 /// <NSCopying>.
2061 ///
2062 /// \param bound Will be set to the bound on non-id subtype types,
2063 /// which will be (possibly specialized) Objective-C class type, or
2064 /// null for 'id.
2065 bool isObjCIdOrObjectKindOfType(const ASTContext &ctx,
2066 const ObjCObjectType *&bound) const;
2067
2068 bool isObjCClassType() const; // Class
2069
2070 /// Whether the type is Objective-C 'Class' or a __kindof type of an
2071 /// Class type, e.g., __kindof Class <NSCopying>.
2072 ///
2073 /// Unlike \c isObjCIdOrObjectKindOfType, there is no relevant bound
2074 /// here because Objective-C's type system cannot express "a class
2075 /// object for a subclass of NSFoo".
2076 bool isObjCClassOrClassKindOfType() const;
2077
2078 bool isBlockCompatibleObjCPointerType(ASTContext &ctx) const;
2079 bool isObjCSelType() const; // Class
2080 bool isObjCBuiltinType() const; // 'id' or 'Class'
2081 bool isObjCARCBridgableType() const;
2082 bool isCARCBridgableType() const;
2083 bool isTemplateTypeParmType() const; // C++ template type parameter
2084 bool isNullPtrType() const; // C++11 std::nullptr_t
2085 bool isNothrowT() const; // C++ std::nothrow_t
2086 bool isAlignValT() const; // C++17 std::align_val_t
2087 bool isStdByteType() const; // C++17 std::byte
2088 bool isAtomicType() const; // C11 _Atomic()
2089 bool isUndeducedAutoType() const; // C++11 auto or
2090 // C++14 decltype(auto)
2091
2092#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
2093 bool is##Id##Type() const;
2094#include "clang/Basic/OpenCLImageTypes.def"
2095
2096 bool isImageType() const; // Any OpenCL image type
2097
2098 bool isSamplerT() const; // OpenCL sampler_t
2099 bool isEventT() const; // OpenCL event_t
2100 bool isClkEventT() const; // OpenCL clk_event_t
2101 bool isQueueT() const; // OpenCL queue_t
2102 bool isReserveIDT() const; // OpenCL reserve_id_t
2103
2104#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
2105 bool is##Id##Type() const;
2106#include "clang/Basic/OpenCLExtensionTypes.def"
2107 // Type defined in cl_intel_device_side_avc_motion_estimation OpenCL extension
2108 bool isOCLIntelSubgroupAVCType() const;
2109 bool isOCLExtOpaqueType() const; // Any OpenCL extension type
2110
2111 bool isPipeType() const; // OpenCL pipe type
2112 bool isOpenCLSpecificType() const; // Any OpenCL specific type
2113
2114 /// Determines if this type, which must satisfy
2115 /// isObjCLifetimeType(), is implicitly __unsafe_unretained rather
2116 /// than implicitly __strong.
2117 bool isObjCARCImplicitlyUnretainedType() const;
2118
2119 /// Return the implicit lifetime for this type, which must not be dependent.
2120 Qualifiers::ObjCLifetime getObjCARCImplicitLifetime() const;
2121
2122 enum ScalarTypeKind {
2123 STK_CPointer,
2124 STK_BlockPointer,
2125 STK_ObjCObjectPointer,
2126 STK_MemberPointer,
2127 STK_Bool,
2128 STK_Integral,
2129 STK_Floating,
2130 STK_IntegralComplex,
2131 STK_FloatingComplex,
2132 STK_FixedPoint
2133 };
2134
2135 /// Given that this is a scalar type, classify it.
2136 ScalarTypeKind getScalarTypeKind() const;
2137
2138 /// Whether this type is a dependent type, meaning that its definition
2139 /// somehow depends on a template parameter (C++ [temp.dep.type]).
2140 bool isDependentType() const { return TypeBits.Dependent; }
2141
2142 /// Determine whether this type is an instantiation-dependent type,
2143 /// meaning that the type involves a template parameter (even if the
2144 /// definition does not actually depend on the type substituted for that
2145 /// template parameter).
2146 bool isInstantiationDependentType() const {
2147 return TypeBits.InstantiationDependent;
2148 }
2149
2150 /// Determine whether this type is an undeduced type, meaning that
2151 /// it somehow involves a C++11 'auto' type or similar which has not yet been
2152 /// deduced.
2153 bool isUndeducedType() const;
2154
2155 /// Whether this type is a variably-modified type (C99 6.7.5).
2156 bool isVariablyModifiedType() const { return TypeBits.VariablyModified; }
2157
2158 /// Whether this type involves a variable-length array type
2159 /// with a definite size.
2160 bool hasSizedVLAType() const;
2161
2162 /// Whether this type is or contains a local or unnamed type.
2163 bool hasUnnamedOrLocalType() const;
2164
2165 bool isOverloadableType() const;
2166
2167 /// Determine wither this type is a C++ elaborated-type-specifier.
2168 bool isElaboratedTypeSpecifier() const;
2169
2170 bool canDecayToPointerType() const;
2171
2172 /// Whether this type is represented natively as a pointer. This includes
2173 /// pointers, references, block pointers, and Objective-C interface,
2174 /// qualified id, and qualified interface types, as well as nullptr_t.
2175 bool hasPointerRepresentation() const;
2176
2177 /// Whether this type can represent an objective pointer type for the
2178 /// purpose of GC'ability
2179 bool hasObjCPointerRepresentation() const;
2180
2181 /// Determine whether this type has an integer representation
2182 /// of some sort, e.g., it is an integer type or a vector.
2183 bool hasIntegerRepresentation() const;
2184
2185 /// Determine whether this type has an signed integer representation
2186 /// of some sort, e.g., it is an signed integer type or a vector.
2187 bool hasSignedIntegerRepresentation() const;
2188
2189 /// Determine whether this type has an unsigned integer representation
2190 /// of some sort, e.g., it is an unsigned integer type or a vector.
2191 bool hasUnsignedIntegerRepresentation() const;
2192
2193 /// Determine whether this type has a floating-point representation
2194 /// of some sort, e.g., it is a floating-point type or a vector thereof.
2195 bool hasFloatingRepresentation() const;
2196
2197 // Type Checking Functions: Check to see if this type is structurally the
2198 // specified type, ignoring typedefs and qualifiers, and return a pointer to
2199 // the best type we can.
2200 const RecordType *getAsStructureType() const;
2201 /// NOTE: getAs*ArrayType are methods on ASTContext.
2202 const RecordType *getAsUnionType() const;
2203 const ComplexType *getAsComplexIntegerType() const; // GCC complex int type.
2204 const ObjCObjectType *getAsObjCInterfaceType() const;
2205
2206 // The following is a convenience method that returns an ObjCObjectPointerType
2207 // for object declared using an interface.
2208 const ObjCObjectPointerType *getAsObjCInterfacePointerType() const;
2209 const ObjCObjectPointerType *getAsObjCQualifiedIdType() const;
2210 const ObjCObjectPointerType *getAsObjCQualifiedClassType() const;
2211 const ObjCObjectType *getAsObjCQualifiedInterfaceType() const;
2212
2213 /// Retrieves the CXXRecordDecl that this type refers to, either
2214 /// because the type is a RecordType or because it is the injected-class-name
2215 /// type of a class template or class template partial specialization.
2216 CXXRecordDecl *getAsCXXRecordDecl() const;
2217
2218 /// Retrieves the RecordDecl this type refers to.
2219 RecordDecl *getAsRecordDecl() const;
2220
2221 /// Retrieves the TagDecl that this type refers to, either
2222 /// because the type is a TagType or because it is the injected-class-name
2223 /// type of a class template or class template partial specialization.
2224 TagDecl *getAsTagDecl() const;
2225
2226 /// If this is a pointer or reference to a RecordType, return the
2227 /// CXXRecordDecl that the type refers to.
2228 ///
2229 /// If this is not a pointer or reference, or the type being pointed to does
2230 /// not refer to a CXXRecordDecl, returns NULL.
2231 const CXXRecordDecl *getPointeeCXXRecordDecl() const;
2232
2233 /// Get the DeducedType whose type will be deduced for a variable with
2234 /// an initializer of this type. This looks through declarators like pointer
2235 /// types, but not through decltype or typedefs.
2236 DeducedType *getContainedDeducedType() const;
2237
2238 /// Get the AutoType whose type will be deduced for a variable with
2239 /// an initializer of this type. This looks through declarators like pointer
2240 /// types, but not through decltype or typedefs.
2241 AutoType *getContainedAutoType() const {
2242 return dyn_cast_or_null<AutoType>(getContainedDeducedType());
2243 }
2244
2245 /// Determine whether this type was written with a leading 'auto'
2246 /// corresponding to a trailing return type (possibly for a nested
2247 /// function type within a pointer to function type or similar).
2248 bool hasAutoForTrailingReturnType() const;
2249
2250 /// Member-template getAs<specific type>'. Look through sugar for
2251 /// an instance of \<specific type>. This scheme will eventually
2252 /// replace the specific getAsXXXX methods above.
2253 ///
2254 /// There are some specializations of this member template listed
2255 /// immediately following this class.
2256 template <typename T> const T *getAs() const;
2257
2258 /// Member-template getAsAdjusted<specific type>. Look through specific kinds
2259 /// of sugar (parens, attributes, etc) for an instance of \<specific type>.
2260 /// This is used when you need to walk over sugar nodes that represent some
2261 /// kind of type adjustment from a type that was written as a \<specific type>
2262 /// to another type that is still canonically a \<specific type>.
2263 template <typename T> const T *getAsAdjusted() const;
2264
2265 /// A variant of getAs<> for array types which silently discards
2266 /// qualifiers from the outermost type.
2267 const ArrayType *getAsArrayTypeUnsafe() const;
2268
2269 /// Member-template castAs<specific type>. Look through sugar for
2270 /// the underlying instance of \<specific type>.
2271 ///
2272 /// This method has the same relationship to getAs<T> as cast<T> has
2273 /// to dyn_cast<T>; which is to say, the underlying type *must*
2274 /// have the intended type, and this method will never return null.
2275 template <typename T> const T *castAs() const;
2276
2277 /// A variant of castAs<> for array type which silently discards
2278 /// qualifiers from the outermost type.
2279 const ArrayType *castAsArrayTypeUnsafe() const;
2280
2281 /// Determine whether this type had the specified attribute applied to it
2282 /// (looking through top-level type sugar).
2283 bool hasAttr(attr::Kind AK) const;
2284
2285 /// Get the base element type of this type, potentially discarding type
2286 /// qualifiers. This should never be used when type qualifiers
2287 /// are meaningful.
2288 const Type *getBaseElementTypeUnsafe() const;
2289
2290 /// If this is an array type, return the element type of the array,
2291 /// potentially with type qualifiers missing.
2292 /// This should never be used when type qualifiers are meaningful.
2293 const Type *getArrayElementTypeNoTypeQual() const;
2294
2295 /// If this is a pointer type, return the pointee type.
2296 /// If this is an array type, return the array element type.
2297 /// This should never be used when type qualifiers are meaningful.
2298 const Type *getPointeeOrArrayElementType() const;
2299
2300 /// If this is a pointer, ObjC object pointer, or block
2301 /// pointer, this returns the respective pointee.
2302 QualType getPointeeType() const;
2303
2304 /// Return the specified type with any "sugar" removed from the type,
2305 /// removing any typedefs, typeofs, etc., as well as any qualifiers.
2306 const Type *getUnqualifiedDesugaredType() const;
2307
2308 /// More type predicates useful for type checking/promotion
2309 bool isPromotableIntegerType() const; // C99 6.3.1.1p2
2310
2311 /// Return true if this is an integer type that is
2312 /// signed, according to C99 6.2.5p4 [char, signed char, short, int, long..],
2313 /// or an enum decl which has a signed representation.
2314 bool isSignedIntegerType() const;
2315
2316 /// Return true if this is an integer type that is
2317 /// unsigned, according to C99 6.2.5p6 [which returns true for _Bool],
2318 /// or an enum decl which has an unsigned representation.
2319 bool isUnsignedIntegerType() const;
2320
2321 /// Determines whether this is an integer type that is signed or an
2322 /// enumeration types whose underlying type is a signed integer type.
2323 bool isSignedIntegerOrEnumerationType() const;
2324
2325 /// Determines whether this is an integer type that is unsigned or an
2326 /// enumeration types whose underlying type is a unsigned integer type.
2327 bool isUnsignedIntegerOrEnumerationType() const;
2328
2329 /// Return true if this is a fixed point type according to
2330 /// ISO/IEC JTC1 SC22 WG14 N1169.
2331 bool isFixedPointType() const;
2332
2333 /// Return true if this is a fixed point or integer type.
2334 bool isFixedPointOrIntegerType() const;
2335
2336 /// Return true if this is a saturated fixed point type according to
2337 /// ISO/IEC JTC1 SC22 WG14 N1169. This type can be signed or unsigned.
2338 bool isSaturatedFixedPointType() const;
2339
2340 /// Return true if this is a saturated fixed point type according to
2341 /// ISO/IEC JTC1 SC22 WG14 N1169. This type can be signed or unsigned.
2342 bool isUnsaturatedFixedPointType() const;
2343
2344 /// Return true if this is a fixed point type that is signed according
2345 /// to ISO/IEC JTC1 SC22 WG14 N1169. This type can also be saturated.
2346 bool isSignedFixedPointType() const;
2347
2348 /// Return true if this is a fixed point type that is unsigned according
2349 /// to ISO/IEC JTC1 SC22 WG14 N1169. This type can also be saturated.
2350 bool isUnsignedFixedPointType() const;
2351
2352 /// Return true if this is not a variable sized type,
2353 /// according to the rules of C99 6.7.5p3. It is not legal to call this on
2354 /// incomplete types.
2355 bool isConstantSizeType() const;
2356
2357 /// Returns true if this type can be represented by some
2358 /// set of type specifiers.
2359 bool isSpecifierType() const;
2360
2361 /// Determine the linkage of this type.
2362 Linkage getLinkage() const;
2363
2364 /// Determine the visibility of this type.
2365 Visibility getVisibility() const {
2366 return getLinkageAndVisibility().getVisibility();
2367 }
2368
2369 /// Return true if the visibility was explicitly set is the code.
2370 bool isVisibilityExplicit() const {
2371 return getLinkageAndVisibility().isVisibilityExplicit();
2372 }
2373
2374 /// Determine the linkage and visibility of this type.
2375 LinkageInfo getLinkageAndVisibility() const;
2376
2377 /// True if the computed linkage is valid. Used for consistency
2378 /// checking. Should always return true.
2379 bool isLinkageValid() const;
2380
2381 /// Determine the nullability of the given type.
2382 ///
2383 /// Note that nullability is only captured as sugar within the type
2384 /// system, not as part of the canonical type, so nullability will
2385 /// be lost by canonicalization and desugaring.
2386 Optional<NullabilityKind> getNullability(const ASTContext &context) const;
2387
2388 /// Determine whether the given type can have a nullability
2389 /// specifier applied to it, i.e., if it is any kind of pointer type.
2390 ///
2391 /// \param ResultIfUnknown The value to return if we don't yet know whether
2392 /// this type can have nullability because it is dependent.
2393 bool canHaveNullability(bool ResultIfUnknown = true) const;
2394
2395 /// Retrieve the set of substitutions required when accessing a member
2396 /// of the Objective-C receiver type that is declared in the given context.
2397 ///
2398 /// \c *this is the type of the object we're operating on, e.g., the
2399 /// receiver for a message send or the base of a property access, and is
2400 /// expected to be of some object or object pointer type.
2401 ///
2402 /// \param dc The declaration context for which we are building up a
2403 /// substitution mapping, which should be an Objective-C class, extension,
2404 /// category, or method within.
2405 ///
2406 /// \returns an array of type arguments that can be substituted for
2407 /// the type parameters of the given declaration context in any type described
2408 /// within that context, or an empty optional to indicate that no
2409 /// substitution is required.
2410 Optional<ArrayRef<QualType>>
2411 getObjCSubstitutions(const DeclContext *dc) const;
2412
2413 /// Determines if this is an ObjC interface type that may accept type
2414 /// parameters.
2415 bool acceptsObjCTypeParams() const;
2416
2417 const char *getTypeClassName() const;
2418
2419 QualType getCanonicalTypeInternal() const {
2420 return CanonicalType;
2421 }
2422
2423 CanQualType getCanonicalTypeUnqualified() const; // in CanonicalType.h
2424 void dump() const;
2425 void dump(llvm::raw_ostream &OS) const;
2426};
2427
2428/// This will check for a TypedefType by removing any existing sugar
2429/// until it reaches a TypedefType or a non-sugared type.
2430template <> const TypedefType *Type::getAs() const;
2431
2432/// This will check for a TemplateSpecializationType by removing any
2433/// existing sugar until it reaches a TemplateSpecializationType or a
2434/// non-sugared type.
2435template <> const TemplateSpecializationType *Type::getAs() const;
2436
2437/// This will check for an AttributedType by removing any existing sugar
2438/// until it reaches an AttributedType or a non-sugared type.
2439template <> const AttributedType *Type::getAs() const;
2440
2441// We can do canonical leaf types faster, because we don't have to
2442// worry about preserving child type decoration.
2443#define TYPE(Class, Base)
2444#define LEAF_TYPE(Class) \
2445template <> inline const Class##Type *Type::getAs() const { \
2446 return dyn_cast<Class##Type>(CanonicalType); \
2447} \
2448template <> inline const Class##Type *Type::castAs() const { \
2449 return cast<Class##Type>(CanonicalType); \
2450}
2451#include "clang/AST/TypeNodes.inc"
2452
2453/// This class is used for builtin types like 'int'. Builtin
2454/// types are always canonical and have a literal name field.
2455class BuiltinType : public Type {
2456public:
2457 enum Kind {
2458// OpenCL image types
2459#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) Id,
2460#include "clang/Basic/OpenCLImageTypes.def"
2461// OpenCL extension types
2462#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) Id,
2463#include "clang/Basic/OpenCLExtensionTypes.def"
2464// SVE Types
2465#define SVE_TYPE(Name, Id, SingletonId) Id,
2466#include "clang/Basic/AArch64SVEACLETypes.def"
2467// All other builtin types
2468#define BUILTIN_TYPE(Id, SingletonId) Id,
2469#define LAST_BUILTIN_TYPE(Id) LastKind = Id
2470#include "clang/AST/BuiltinTypes.def"
2471 };
2472
2473private:
2474 friend class ASTContext; // ASTContext creates these.
2475
2476 BuiltinType(Kind K)
2477 : Type(Builtin, QualType(), /*Dependent=*/(K == Dependent),
2478 /*InstantiationDependent=*/(K == Dependent),
2479 /*VariablyModified=*/false,
2480 /*Unexpanded parameter pack=*/false) {
2481 BuiltinTypeBits.Kind = K;
2482 }
2483
2484public:
2485 Kind getKind() const { return static_cast<Kind>(BuiltinTypeBits.Kind); }
2486 StringRef getName(const PrintingPolicy &Policy) const;
2487
2488 const char *getNameAsCString(const PrintingPolicy &Policy) const {
2489 // The StringRef is null-terminated.
2490 StringRef str = getName(Policy);
2491 assert(!str.empty() && str.data()[str.size()] == '\0')((!str.empty() && str.data()[str.size()] == '\0') ? static_cast
<void> (0) : __assert_fail ("!str.empty() && str.data()[str.size()] == '\\0'"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 2491, __PRETTY_FUNCTION__))
;
2492 return str.data();
2493 }
2494
2495 bool isSugared() const { return false; }
2496 QualType desugar() const { return QualType(this, 0); }
2497
2498 bool isInteger() const {
2499 return getKind() >= Bool && getKind() <= Int128;
2500 }
2501
2502 bool isSignedInteger() const {
2503 return getKind() >= Char_S && getKind() <= Int128;
2504 }
2505
2506 bool isUnsignedInteger() const {
2507 return getKind() >= Bool && getKind() <= UInt128;
2508 }
2509
2510 bool isFloatingPoint() const {
2511 return getKind() >= Half && getKind() <= Float128;
2512 }
2513
2514 /// Determines whether the given kind corresponds to a placeholder type.
2515 static bool isPlaceholderTypeKind(Kind K) {
2516 return K >= Overload;
2517 }
2518
2519 /// Determines whether this type is a placeholder type, i.e. a type
2520 /// which cannot appear in arbitrary positions in a fully-formed
2521 /// expression.
2522 bool isPlaceholderType() const {
2523 return isPlaceholderTypeKind(getKind());
2524 }
2525
2526 /// Determines whether this type is a placeholder type other than
2527 /// Overload. Most placeholder types require only syntactic
2528 /// information about their context in order to be resolved (e.g.
2529 /// whether it is a call expression), which means they can (and
2530 /// should) be resolved in an earlier "phase" of analysis.
2531 /// Overload expressions sometimes pick up further information
2532 /// from their context, like whether the context expects a
2533 /// specific function-pointer type, and so frequently need
2534 /// special treatment.
2535 bool isNonOverloadPlaceholderType() const {
2536 return getKind() > Overload;
2537 }
2538
2539 static bool classof(const Type *T) { return T->getTypeClass() == Builtin; }
2540};
2541
2542/// Complex values, per C99 6.2.5p11. This supports the C99 complex
2543/// types (_Complex float etc) as well as the GCC integer complex extensions.
2544class ComplexType : public Type, public llvm::FoldingSetNode {
2545 friend class ASTContext; // ASTContext creates these.
2546
2547 QualType ElementType;
2548
2549 ComplexType(QualType Element, QualType CanonicalPtr)
2550 : Type(Complex, CanonicalPtr, Element->isDependentType(),
2551 Element->isInstantiationDependentType(),
2552 Element->isVariablyModifiedType(),
2553 Element->containsUnexpandedParameterPack()),
2554 ElementType(Element) {}
2555
2556public:
2557 QualType getElementType() const { return ElementType; }
2558
2559 bool isSugared() const { return false; }
2560 QualType desugar() const { return QualType(this, 0); }
2561
2562 void Profile(llvm::FoldingSetNodeID &ID) {
2563 Profile(ID, getElementType());
2564 }
2565
2566 static void Profile(llvm::FoldingSetNodeID &ID, QualType Element) {
2567 ID.AddPointer(Element.getAsOpaquePtr());
2568 }
2569
2570 static bool classof(const Type *T) { return T->getTypeClass() == Complex; }
2571};
2572
2573/// Sugar for parentheses used when specifying types.
2574class ParenType : public Type, public llvm::FoldingSetNode {
2575 friend class ASTContext; // ASTContext creates these.
2576
2577 QualType Inner;
2578
2579 ParenType(QualType InnerType, QualType CanonType)
2580 : Type(Paren, CanonType, InnerType->isDependentType(),
2581 InnerType->isInstantiationDependentType(),
2582 InnerType->isVariablyModifiedType(),
2583 InnerType->containsUnexpandedParameterPack()),
2584 Inner(InnerType) {}
2585
2586public:
2587 QualType getInnerType() const { return Inner; }
2588
2589 bool isSugared() const { return true; }
2590 QualType desugar() const { return getInnerType(); }
2591
2592 void Profile(llvm::FoldingSetNodeID &ID) {
2593 Profile(ID, getInnerType());
2594 }
2595
2596 static void Profile(llvm::FoldingSetNodeID &ID, QualType Inner) {
2597 Inner.Profile(ID);
2598 }
2599
2600 static bool classof(const Type *T) { return T->getTypeClass() == Paren; }
2601};
2602
2603/// PointerType - C99 6.7.5.1 - Pointer Declarators.
2604class PointerType : public Type, public llvm::FoldingSetNode {
2605 friend class ASTContext; // ASTContext creates these.
2606
2607 QualType PointeeType;
2608
2609 PointerType(QualType Pointee, QualType CanonicalPtr)
2610 : Type(Pointer, CanonicalPtr, Pointee->isDependentType(),
2611 Pointee->isInstantiationDependentType(),
2612 Pointee->isVariablyModifiedType(),
2613 Pointee->containsUnexpandedParameterPack()),
2614 PointeeType(Pointee) {}
2615
2616public:
2617 QualType getPointeeType() const { return PointeeType; }
2618
2619 /// Returns true if address spaces of pointers overlap.
2620 /// OpenCL v2.0 defines conversion rules for pointers to different
2621 /// address spaces (OpenCLC v2.0 s6.5.5) and notion of overlapping
2622 /// address spaces.
2623 /// CL1.1 or CL1.2:
2624 /// address spaces overlap iff they are they same.
2625 /// CL2.0 adds:
2626 /// __generic overlaps with any address space except for __constant.
2627 bool isAddressSpaceOverlapping(const PointerType &other) const {
2628 Qualifiers thisQuals = PointeeType.getQualifiers();
2629 Qualifiers otherQuals = other.getPointeeType().getQualifiers();
2630 // Address spaces overlap if at least one of them is a superset of another
2631 return thisQuals.isAddressSpaceSupersetOf(otherQuals) ||
2632 otherQuals.isAddressSpaceSupersetOf(thisQuals);
2633 }
2634
2635 bool isSugared() const { return false; }
2636 QualType desugar() const { return QualType(this, 0); }
2637
2638 void Profile(llvm::FoldingSetNodeID &ID) {
2639 Profile(ID, getPointeeType());
2640 }
2641
2642 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee) {
2643 ID.AddPointer(Pointee.getAsOpaquePtr());
2644 }
2645
2646 static bool classof(const Type *T) { return T->getTypeClass() == Pointer; }
2647};
2648
2649/// Represents a type which was implicitly adjusted by the semantic
2650/// engine for arbitrary reasons. For example, array and function types can
2651/// decay, and function types can have their calling conventions adjusted.
2652class AdjustedType : public Type, public llvm::FoldingSetNode {
2653 QualType OriginalTy;
2654 QualType AdjustedTy;
2655
2656protected:
2657 friend class ASTContext; // ASTContext creates these.
2658
2659 AdjustedType(TypeClass TC, QualType OriginalTy, QualType AdjustedTy,
2660 QualType CanonicalPtr)
2661 : Type(TC, CanonicalPtr, OriginalTy->isDependentType(),
2662 OriginalTy->isInstantiationDependentType(),
2663 OriginalTy->isVariablyModifiedType(),
2664 OriginalTy->containsUnexpandedParameterPack()),
2665 OriginalTy(OriginalTy), AdjustedTy(AdjustedTy) {}
2666
2667public:
2668 QualType getOriginalType() const { return OriginalTy; }
2669 QualType getAdjustedType() const { return AdjustedTy; }
2670
2671 bool isSugared() const { return true; }
2672 QualType desugar() const { return AdjustedTy; }
2673
2674 void Profile(llvm::FoldingSetNodeID &ID) {
2675 Profile(ID, OriginalTy, AdjustedTy);
2676 }
2677
2678 static void Profile(llvm::FoldingSetNodeID &ID, QualType Orig, QualType New) {
2679 ID.AddPointer(Orig.getAsOpaquePtr());
2680 ID.AddPointer(New.getAsOpaquePtr());
2681 }
2682
2683 static bool classof(const Type *T) {
2684 return T->getTypeClass() == Adjusted || T->getTypeClass() == Decayed;
2685 }
2686};
2687
2688/// Represents a pointer type decayed from an array or function type.
2689class DecayedType : public AdjustedType {
2690 friend class ASTContext; // ASTContext creates these.
2691
2692 inline
2693 DecayedType(QualType OriginalType, QualType Decayed, QualType Canonical);
2694
2695public:
2696 QualType getDecayedType() const { return getAdjustedType(); }
2697
2698 inline QualType getPointeeType() const;
2699
2700 static bool classof(const Type *T) { return T->getTypeClass() == Decayed; }
2701};
2702
2703/// Pointer to a block type.
2704/// This type is to represent types syntactically represented as
2705/// "void (^)(int)", etc. Pointee is required to always be a function type.
2706class BlockPointerType : public Type, public llvm::FoldingSetNode {
2707 friend class ASTContext; // ASTContext creates these.
2708
2709 // Block is some kind of pointer type
2710 QualType PointeeType;
2711
2712 BlockPointerType(QualType Pointee, QualType CanonicalCls)
2713 : Type(BlockPointer, CanonicalCls, Pointee->isDependentType(),
2714 Pointee->isInstantiationDependentType(),
2715 Pointee->isVariablyModifiedType(),
2716 Pointee->containsUnexpandedParameterPack()),
2717 PointeeType(Pointee) {}
2718
2719public:
2720 // Get the pointee type. Pointee is required to always be a function type.
2721 QualType getPointeeType() const { return PointeeType; }
2722
2723 bool isSugared() const { return false; }
2724 QualType desugar() const { return QualType(this, 0); }
2725
2726 void Profile(llvm::FoldingSetNodeID &ID) {
2727 Profile(ID, getPointeeType());
2728 }
2729
2730 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee) {
2731 ID.AddPointer(Pointee.getAsOpaquePtr());
2732 }
2733
2734 static bool classof(const Type *T) {
2735 return T->getTypeClass() == BlockPointer;
2736 }
2737};
2738
2739/// Base for LValueReferenceType and RValueReferenceType
2740class ReferenceType : public Type, public llvm::FoldingSetNode {
2741 QualType PointeeType;
2742
2743protected:
2744 ReferenceType(TypeClass tc, QualType Referencee, QualType CanonicalRef,
2745 bool SpelledAsLValue)
2746 : Type(tc, CanonicalRef, Referencee->isDependentType(),
2747 Referencee->isInstantiationDependentType(),
2748 Referencee->isVariablyModifiedType(),
2749 Referencee->containsUnexpandedParameterPack()),
2750 PointeeType(Referencee) {
2751 ReferenceTypeBits.SpelledAsLValue = SpelledAsLValue;
2752 ReferenceTypeBits.InnerRef = Referencee->isReferenceType();
2753 }
2754
2755public:
2756 bool isSpelledAsLValue() const { return ReferenceTypeBits.SpelledAsLValue; }
2757 bool isInnerRef() const { return ReferenceTypeBits.InnerRef; }
2758
2759 QualType getPointeeTypeAsWritten() const { return PointeeType; }
2760
2761 QualType getPointeeType() const {
2762 // FIXME: this might strip inner qualifiers; okay?
2763 const ReferenceType *T = this;
2764 while (T->isInnerRef())
2765 T = T->PointeeType->castAs<ReferenceType>();
2766 return T->PointeeType;
2767 }
2768
2769 void Profile(llvm::FoldingSetNodeID &ID) {
2770 Profile(ID, PointeeType, isSpelledAsLValue());
2771 }
2772
2773 static void Profile(llvm::FoldingSetNodeID &ID,
2774 QualType Referencee,
2775 bool SpelledAsLValue) {
2776 ID.AddPointer(Referencee.getAsOpaquePtr());
2777 ID.AddBoolean(SpelledAsLValue);
2778 }
2779
2780 static bool classof(const Type *T) {
2781 return T->getTypeClass() == LValueReference ||
2782 T->getTypeClass() == RValueReference;
2783 }
2784};
2785
2786/// An lvalue reference type, per C++11 [dcl.ref].
2787class LValueReferenceType : public ReferenceType {
2788 friend class ASTContext; // ASTContext creates these
2789
2790 LValueReferenceType(QualType Referencee, QualType CanonicalRef,
2791 bool SpelledAsLValue)
2792 : ReferenceType(LValueReference, Referencee, CanonicalRef,
2793 SpelledAsLValue) {}
2794
2795public:
2796 bool isSugared() const { return false; }
2797 QualType desugar() const { return QualType(this, 0); }
2798
2799 static bool classof(const Type *T) {
2800 return T->getTypeClass() == LValueReference;
2801 }
2802};
2803
2804/// An rvalue reference type, per C++11 [dcl.ref].
2805class RValueReferenceType : public ReferenceType {
2806 friend class ASTContext; // ASTContext creates these
2807
2808 RValueReferenceType(QualType Referencee, QualType CanonicalRef)
2809 : ReferenceType(RValueReference, Referencee, CanonicalRef, false) {}
2810
2811public:
2812 bool isSugared() const { return false; }
2813 QualType desugar() const { return QualType(this, 0); }
2814
2815 static bool classof(const Type *T) {
2816 return T->getTypeClass() == RValueReference;
2817 }
2818};
2819
2820/// A pointer to member type per C++ 8.3.3 - Pointers to members.
2821///
2822/// This includes both pointers to data members and pointer to member functions.
2823class MemberPointerType : public Type, public llvm::FoldingSetNode {
2824 friend class ASTContext; // ASTContext creates these.
2825
2826 QualType PointeeType;
2827
2828 /// The class of which the pointee is a member. Must ultimately be a
2829 /// RecordType, but could be a typedef or a template parameter too.
2830 const Type *Class;
2831
2832 MemberPointerType(QualType Pointee, const Type *Cls, QualType CanonicalPtr)
2833 : Type(MemberPointer, CanonicalPtr,
2834 Cls->isDependentType() || Pointee->isDependentType(),
2835 (Cls->isInstantiationDependentType() ||
2836 Pointee->isInstantiationDependentType()),
2837 Pointee->isVariablyModifiedType(),
2838 (Cls->containsUnexpandedParameterPack() ||
2839 Pointee->containsUnexpandedParameterPack())),
2840 PointeeType(Pointee), Class(Cls) {}
2841
2842public:
2843 QualType getPointeeType() const { return PointeeType; }
2844
2845 /// Returns true if the member type (i.e. the pointee type) is a
2846 /// function type rather than a data-member type.
2847 bool isMemberFunctionPointer() const {
2848 return PointeeType->isFunctionProtoType();
2849 }
2850
2851 /// Returns true if the member type (i.e. the pointee type) is a
2852 /// data type rather than a function type.
2853 bool isMemberDataPointer() const {
2854 return !PointeeType->isFunctionProtoType();
2855 }
2856
2857 const Type *getClass() const { return Class; }
2858 CXXRecordDecl *getMostRecentCXXRecordDecl() const;
2859
2860 bool isSugared() const { return false; }
2861 QualType desugar() const { return QualType(this, 0); }
2862
2863 void Profile(llvm::FoldingSetNodeID &ID) {
2864 Profile(ID, getPointeeType(), getClass());
2865 }
2866
2867 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee,
2868 const Type *Class) {
2869 ID.AddPointer(Pointee.getAsOpaquePtr());
2870 ID.AddPointer(Class);
2871 }
2872
2873 static bool classof(const Type *T) {
2874 return T->getTypeClass() == MemberPointer;
2875 }
2876};
2877
2878/// Represents an array type, per C99 6.7.5.2 - Array Declarators.
2879class ArrayType : public Type, public llvm::FoldingSetNode {
2880public:
2881 /// Capture whether this is a normal array (e.g. int X[4])
2882 /// an array with a static size (e.g. int X[static 4]), or an array
2883 /// with a star size (e.g. int X[*]).
2884 /// 'static' is only allowed on function parameters.
2885 enum ArraySizeModifier {
2886 Normal, Static, Star
2887 };
2888
2889private:
2890 /// The element type of the array.
2891 QualType ElementType;
2892
2893protected:
2894 friend class ASTContext; // ASTContext creates these.
2895
2896 ArrayType(TypeClass tc, QualType et, QualType can, ArraySizeModifier sm,
2897 unsigned tq, const Expr *sz = nullptr);
2898
2899public:
2900 QualType getElementType() const { return ElementType; }
2901
2902 ArraySizeModifier getSizeModifier() const {
2903 return ArraySizeModifier(ArrayTypeBits.SizeModifier);
2904 }
2905
2906 Qualifiers getIndexTypeQualifiers() const {
2907 return Qualifiers::fromCVRMask(getIndexTypeCVRQualifiers());
2908 }
2909
2910 unsigned getIndexTypeCVRQualifiers() const {
2911 return ArrayTypeBits.IndexTypeQuals;
2912 }
2913
2914 static bool classof(const Type *T) {
2915 return T->getTypeClass() == ConstantArray ||
2916 T->getTypeClass() == VariableArray ||
2917 T->getTypeClass() == IncompleteArray ||
2918 T->getTypeClass() == DependentSizedArray;
2919 }
2920};
2921
2922/// Represents the canonical version of C arrays with a specified constant size.
2923/// For example, the canonical type for 'int A[4 + 4*100]' is a
2924/// ConstantArrayType where the element type is 'int' and the size is 404.
2925class ConstantArrayType final
2926 : public ArrayType,
2927 private llvm::TrailingObjects<ConstantArrayType, const Expr *> {
2928 friend class ASTContext; // ASTContext creates these.
2929 friend TrailingObjects;
2930
2931 llvm::APInt Size; // Allows us to unique the type.
2932
2933 ConstantArrayType(QualType et, QualType can, const llvm::APInt &size,
2934 const Expr *sz, ArraySizeModifier sm, unsigned tq)
2935 : ArrayType(ConstantArray, et, can, sm, tq, sz), Size(size) {
2936 ConstantArrayTypeBits.HasStoredSizeExpr = sz != nullptr;
2937 if (ConstantArrayTypeBits.HasStoredSizeExpr) {
2938 assert(!can.isNull() && "canonical constant array should not have size")((!can.isNull() && "canonical constant array should not have size"
) ? static_cast<void> (0) : __assert_fail ("!can.isNull() && \"canonical constant array should not have size\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 2938, __PRETTY_FUNCTION__))
;
2939 *getTrailingObjects<const Expr*>() = sz;
2940 }
2941 }
2942
2943 unsigned numTrailingObjects(OverloadToken<const Expr*>) const {
2944 return ConstantArrayTypeBits.HasStoredSizeExpr;
2945 }
2946
2947public:
2948 const llvm::APInt &getSize() const { return Size; }
2949 const Expr *getSizeExpr() const {
2950 return ConstantArrayTypeBits.HasStoredSizeExpr
2951 ? *getTrailingObjects<const Expr *>()
2952 : nullptr;
2953 }
2954 bool isSugared() const { return false; }
2955 QualType desugar() const { return QualType(this, 0); }
2956
2957 /// Determine the number of bits required to address a member of
2958 // an array with the given element type and number of elements.
2959 static unsigned getNumAddressingBits(const ASTContext &Context,
2960 QualType ElementType,
2961 const llvm::APInt &NumElements);
2962
2963 /// Determine the maximum number of active bits that an array's size
2964 /// can require, which limits the maximum size of the array.
2965 static unsigned getMaxSizeBits(const ASTContext &Context);
2966
2967 void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Ctx) {
2968 Profile(ID, Ctx, getElementType(), getSize(), getSizeExpr(),
2969 getSizeModifier(), getIndexTypeCVRQualifiers());
2970 }
2971
2972 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Ctx,
2973 QualType ET, const llvm::APInt &ArraySize,
2974 const Expr *SizeExpr, ArraySizeModifier SizeMod,
2975 unsigned TypeQuals);
2976
2977 static bool classof(const Type *T) {
2978 return T->getTypeClass() == ConstantArray;
2979 }
2980};
2981
2982/// Represents a C array with an unspecified size. For example 'int A[]' has
2983/// an IncompleteArrayType where the element type is 'int' and the size is
2984/// unspecified.
2985class IncompleteArrayType : public ArrayType {
2986 friend class ASTContext; // ASTContext creates these.
2987
2988 IncompleteArrayType(QualType et, QualType can,
2989 ArraySizeModifier sm, unsigned tq)
2990 : ArrayType(IncompleteArray, et, can, sm, tq) {}
2991
2992public:
2993 friend class StmtIteratorBase;
2994
2995 bool isSugared() const { return false; }
2996 QualType desugar() const { return QualType(this, 0); }
2997
2998 static bool classof(const Type *T) {
2999 return T->getTypeClass() == IncompleteArray;
3000 }
3001
3002 void Profile(llvm::FoldingSetNodeID &ID) {
3003 Profile(ID, getElementType(), getSizeModifier(),
3004 getIndexTypeCVRQualifiers());
3005 }
3006
3007 static void Profile(llvm::FoldingSetNodeID &ID, QualType ET,
3008 ArraySizeModifier SizeMod, unsigned TypeQuals) {
3009 ID.AddPointer(ET.getAsOpaquePtr());
3010 ID.AddInteger(SizeMod);
3011 ID.AddInteger(TypeQuals);
3012 }
3013};
3014
3015/// Represents a C array with a specified size that is not an
3016/// integer-constant-expression. For example, 'int s[x+foo()]'.
3017/// Since the size expression is an arbitrary expression, we store it as such.
3018///
3019/// Note: VariableArrayType's aren't uniqued (since the expressions aren't) and
3020/// should not be: two lexically equivalent variable array types could mean
3021/// different things, for example, these variables do not have the same type
3022/// dynamically:
3023///
3024/// void foo(int x) {
3025/// int Y[x];
3026/// ++x;
3027/// int Z[x];
3028/// }
3029class VariableArrayType : public ArrayType {
3030 friend class ASTContext; // ASTContext creates these.
3031
3032 /// An assignment-expression. VLA's are only permitted within
3033 /// a function block.
3034 Stmt *SizeExpr;
3035
3036 /// The range spanned by the left and right array brackets.
3037 SourceRange Brackets;
3038
3039 VariableArrayType(QualType et, QualType can, Expr *e,
3040 ArraySizeModifier sm, unsigned tq,
3041 SourceRange brackets)
3042 : ArrayType(VariableArray, et, can, sm, tq, e),
3043 SizeExpr((Stmt*) e), Brackets(brackets) {}
3044
3045public:
3046 friend class StmtIteratorBase;
3047
3048 Expr *getSizeExpr() const {
3049 // We use C-style casts instead of cast<> here because we do not wish
3050 // to have a dependency of Type.h on Stmt.h/Expr.h.
3051 return (Expr*) SizeExpr;
3052 }
3053
3054 SourceRange getBracketsRange() const { return Brackets; }
3055 SourceLocation getLBracketLoc() const { return Brackets.getBegin(); }
3056 SourceLocation getRBracketLoc() const { return Brackets.getEnd(); }
3057
3058 bool isSugared() const { return false; }
3059 QualType desugar() const { return QualType(this, 0); }
3060
3061 static bool classof(const Type *T) {
3062 return T->getTypeClass() == VariableArray;
3063 }
3064
3065 void Profile(llvm::FoldingSetNodeID &ID) {
3066 llvm_unreachable("Cannot unique VariableArrayTypes.")::llvm::llvm_unreachable_internal("Cannot unique VariableArrayTypes."
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 3066)
;
3067 }
3068};
3069
3070/// Represents an array type in C++ whose size is a value-dependent expression.
3071///
3072/// For example:
3073/// \code
3074/// template<typename T, int Size>
3075/// class array {
3076/// T data[Size];
3077/// };
3078/// \endcode
3079///
3080/// For these types, we won't actually know what the array bound is
3081/// until template instantiation occurs, at which point this will
3082/// become either a ConstantArrayType or a VariableArrayType.
3083class DependentSizedArrayType : public ArrayType {
3084 friend class ASTContext; // ASTContext creates these.
3085
3086 const ASTContext &Context;
3087
3088 /// An assignment expression that will instantiate to the
3089 /// size of the array.
3090 ///
3091 /// The expression itself might be null, in which case the array
3092 /// type will have its size deduced from an initializer.
3093 Stmt *SizeExpr;
3094
3095 /// The range spanned by the left and right array brackets.
3096 SourceRange Brackets;
3097
3098 DependentSizedArrayType(const ASTContext &Context, QualType et, QualType can,
3099 Expr *e, ArraySizeModifier sm, unsigned tq,
3100 SourceRange brackets);
3101
3102public:
3103 friend class StmtIteratorBase;
3104
3105 Expr *getSizeExpr() const {
3106 // We use C-style casts instead of cast<> here because we do not wish
3107 // to have a dependency of Type.h on Stmt.h/Expr.h.
3108 return (Expr*) SizeExpr;
3109 }
3110
3111 SourceRange getBracketsRange() const { return Brackets; }
3112 SourceLocation getLBracketLoc() const { return Brackets.getBegin(); }
3113 SourceLocation getRBracketLoc() const { return Brackets.getEnd(); }
3114
3115 bool isSugared() const { return false; }
3116 QualType desugar() const { return QualType(this, 0); }
3117
3118 static bool classof(const Type *T) {
3119 return T->getTypeClass() == DependentSizedArray;
3120 }
3121
3122 void Profile(llvm::FoldingSetNodeID &ID) {
3123 Profile(ID, Context, getElementType(),
3124 getSizeModifier(), getIndexTypeCVRQualifiers(), getSizeExpr());
3125 }
3126
3127 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
3128 QualType ET, ArraySizeModifier SizeMod,
3129 unsigned TypeQuals, Expr *E);
3130};
3131
3132/// Represents an extended address space qualifier where the input address space
3133/// value is dependent. Non-dependent address spaces are not represented with a
3134/// special Type subclass; they are stored on an ExtQuals node as part of a QualType.
3135///
3136/// For example:
3137/// \code
3138/// template<typename T, int AddrSpace>
3139/// class AddressSpace {
3140/// typedef T __attribute__((address_space(AddrSpace))) type;
3141/// }
3142/// \endcode
3143class DependentAddressSpaceType : public Type, public llvm::FoldingSetNode {
3144 friend class ASTContext;
3145
3146 const ASTContext &Context;
3147 Expr *AddrSpaceExpr;
3148 QualType PointeeType;
3149 SourceLocation loc;
3150
3151 DependentAddressSpaceType(const ASTContext &Context, QualType PointeeType,
3152 QualType can, Expr *AddrSpaceExpr,
3153 SourceLocation loc);
3154
3155public:
3156 Expr *getAddrSpaceExpr() const { return AddrSpaceExpr; }
3157 QualType getPointeeType() const { return PointeeType; }
3158 SourceLocation getAttributeLoc() const { return loc; }
3159
3160 bool isSugared() const { return false; }
3161 QualType desugar() const { return QualType(this, 0); }
3162
3163 static bool classof(const Type *T) {
3164 return T->getTypeClass() == DependentAddressSpace;
3165 }
3166
3167 void Profile(llvm::FoldingSetNodeID &ID) {
3168 Profile(ID, Context, getPointeeType(), getAddrSpaceExpr());
3169 }
3170
3171 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
3172 QualType PointeeType, Expr *AddrSpaceExpr);
3173};
3174
3175/// Represents an extended vector type where either the type or size is
3176/// dependent.
3177///
3178/// For example:
3179/// \code
3180/// template<typename T, int Size>
3181/// class vector {
3182/// typedef T __attribute__((ext_vector_type(Size))) type;
3183/// }
3184/// \endcode
3185class DependentSizedExtVectorType : public Type, public llvm::FoldingSetNode {
3186 friend class ASTContext;
3187
3188 const ASTContext &Context;
3189 Expr *SizeExpr;
3190
3191 /// The element type of the array.
3192 QualType ElementType;
3193
3194 SourceLocation loc;
3195
3196 DependentSizedExtVectorType(const ASTContext &Context, QualType ElementType,
3197 QualType can, Expr *SizeExpr, SourceLocation loc);
3198
3199public:
3200 Expr *getSizeExpr() const { return SizeExpr; }
3201 QualType getElementType() const { return ElementType; }
3202 SourceLocation getAttributeLoc() const { return loc; }
3203
3204 bool isSugared() const { return false; }
3205 QualType desugar() const { return QualType(this, 0); }
3206
3207 static bool classof(const Type *T) {
3208 return T->getTypeClass() == DependentSizedExtVector;
3209 }
3210
3211 void Profile(llvm::FoldingSetNodeID &ID) {
3212 Profile(ID, Context, getElementType(), getSizeExpr());
3213 }
3214
3215 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
3216 QualType ElementType, Expr *SizeExpr);
3217};
3218
3219
3220/// Represents a GCC generic vector type. This type is created using
3221/// __attribute__((vector_size(n)), where "n" specifies the vector size in
3222/// bytes; or from an Altivec __vector or vector declaration.
3223/// Since the constructor takes the number of vector elements, the
3224/// client is responsible for converting the size into the number of elements.
3225class VectorType : public Type, public llvm::FoldingSetNode {
3226public:
3227 enum VectorKind {
3228 /// not a target-specific vector type
3229 GenericVector,
3230
3231 /// is AltiVec vector
3232 AltiVecVector,
3233
3234 /// is AltiVec 'vector Pixel'
3235 AltiVecPixel,
3236
3237 /// is AltiVec 'vector bool ...'
3238 AltiVecBool,
3239
3240 /// is ARM Neon vector
3241 NeonVector,
3242
3243 /// is ARM Neon polynomial vector
3244 NeonPolyVector
3245 };
3246
3247protected:
3248 friend class ASTContext; // ASTContext creates these.
3249
3250 /// The element type of the vector.
3251 QualType ElementType;
3252
3253 VectorType(QualType vecType, unsigned nElements, QualType canonType,
3254 VectorKind vecKind);
3255
3256 VectorType(TypeClass tc, QualType vecType, unsigned nElements,
3257 QualType canonType, VectorKind vecKind);
3258
3259public:
3260 QualType getElementType() const { return ElementType; }
3261 unsigned getNumElements() const { return VectorTypeBits.NumElements; }
3262
3263 static bool isVectorSizeTooLarge(unsigned NumElements) {
3264 return NumElements > VectorTypeBitfields::MaxNumElements;
3265 }
3266
3267 bool isSugared() const { return false; }
3268 QualType desugar() const { return QualType(this, 0); }
3269
3270 VectorKind getVectorKind() const {
3271 return VectorKind(VectorTypeBits.VecKind);
3272 }
3273
3274 void Profile(llvm::FoldingSetNodeID &ID) {
3275 Profile(ID, getElementType(), getNumElements(),
3276 getTypeClass(), getVectorKind());
3277 }
3278
3279 static void Profile(llvm::FoldingSetNodeID &ID, QualType ElementType,
3280 unsigned NumElements, TypeClass TypeClass,
3281 VectorKind VecKind) {
3282 ID.AddPointer(ElementType.getAsOpaquePtr());
3283 ID.AddInteger(NumElements);
3284 ID.AddInteger(TypeClass);
3285 ID.AddInteger(VecKind);
3286 }
3287
3288 static bool classof(const Type *T) {
3289 return T->getTypeClass() == Vector || T->getTypeClass() == ExtVector;
3290 }
3291};
3292
3293/// Represents a vector type where either the type or size is dependent.
3294////
3295/// For example:
3296/// \code
3297/// template<typename T, int Size>
3298/// class vector {
3299/// typedef T __attribute__((vector_size(Size))) type;
3300/// }
3301/// \endcode
3302class DependentVectorType : public Type, public llvm::FoldingSetNode {
3303 friend class ASTContext;
3304
3305 const ASTContext &Context;
3306 QualType ElementType;
3307 Expr *SizeExpr;
3308 SourceLocation Loc;
3309
3310 DependentVectorType(const ASTContext &Context, QualType ElementType,
3311 QualType CanonType, Expr *SizeExpr,
3312 SourceLocation Loc, VectorType::VectorKind vecKind);
3313
3314public:
3315 Expr *getSizeExpr() const { return SizeExpr; }
3316 QualType getElementType() const { return ElementType; }
3317 SourceLocation getAttributeLoc() const { return Loc; }
3318 VectorType::VectorKind getVectorKind() const {
3319 return VectorType::VectorKind(VectorTypeBits.VecKind);
3320 }
3321
3322 bool isSugared() const { return false; }
3323 QualType desugar() const { return QualType(this, 0); }
3324
3325 static bool classof(const Type *T) {
3326 return T->getTypeClass() == DependentVector;
3327 }
3328
3329 void Profile(llvm::FoldingSetNodeID &ID) {
3330 Profile(ID, Context, getElementType(), getSizeExpr(), getVectorKind());
3331 }
3332
3333 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
3334 QualType ElementType, const Expr *SizeExpr,
3335 VectorType::VectorKind VecKind);
3336};
3337
3338/// ExtVectorType - Extended vector type. This type is created using
3339/// __attribute__((ext_vector_type(n)), where "n" is the number of elements.
3340/// Unlike vector_size, ext_vector_type is only allowed on typedef's. This
3341/// class enables syntactic extensions, like Vector Components for accessing
3342/// points (as .xyzw), colors (as .rgba), and textures (modeled after OpenGL
3343/// Shading Language).
3344class ExtVectorType : public VectorType {
3345 friend class ASTContext; // ASTContext creates these.
3346
3347 ExtVectorType(QualType vecType, unsigned nElements, QualType canonType)
3348 : VectorType(ExtVector, vecType, nElements, canonType, GenericVector) {}
3349
3350public:
3351 static int getPointAccessorIdx(char c) {
3352 switch (c) {
3353 default: return -1;
3354 case 'x': case 'r': return 0;
3355 case 'y': case 'g': return 1;
3356 case 'z': case 'b': return 2;
3357 case 'w': case 'a': return 3;
3358 }
3359 }
3360
3361 static int getNumericAccessorIdx(char c) {
3362 switch (c) {
3363 default: return -1;
3364 case '0': return 0;
3365 case '1': return 1;
3366 case '2': return 2;
3367 case '3': return 3;
3368 case '4': return 4;
3369 case '5': return 5;
3370 case '6': return 6;
3371 case '7': return 7;
3372 case '8': return 8;
3373 case '9': return 9;
3374 case 'A':
3375 case 'a': return 10;
3376 case 'B':
3377 case 'b': return 11;
3378 case 'C':
3379 case 'c': return 12;
3380 case 'D':
3381 case 'd': return 13;
3382 case 'E':
3383 case 'e': return 14;
3384 case 'F':
3385 case 'f': return 15;
3386 }
3387 }
3388
3389 static int getAccessorIdx(char c, bool isNumericAccessor) {
3390 if (isNumericAccessor)
3391 return getNumericAccessorIdx(c);
3392 else
3393 return getPointAccessorIdx(c);
3394 }
3395
3396 bool isAccessorWithinNumElements(char c, bool isNumericAccessor) const {
3397 if (int idx = getAccessorIdx(c, isNumericAccessor)+1)
3398 return unsigned(idx-1) < getNumElements();
3399 return false;
3400 }
3401
3402 bool isSugared() const { return false; }
3403 QualType desugar() const { return QualType(this, 0); }
3404
3405 static bool classof(const Type *T) {
3406 return T->getTypeClass() == ExtVector;
3407 }
3408};
3409
3410/// FunctionType - C99 6.7.5.3 - Function Declarators. This is the common base
3411/// class of FunctionNoProtoType and FunctionProtoType.
3412class FunctionType : public Type {
3413 // The type returned by the function.
3414 QualType ResultType;
3415
3416public:
3417 /// Interesting information about a specific parameter that can't simply
3418 /// be reflected in parameter's type. This is only used by FunctionProtoType
3419 /// but is in FunctionType to make this class available during the
3420 /// specification of the bases of FunctionProtoType.
3421 ///
3422 /// It makes sense to model language features this way when there's some
3423 /// sort of parameter-specific override (such as an attribute) that
3424 /// affects how the function is called. For example, the ARC ns_consumed
3425 /// attribute changes whether a parameter is passed at +0 (the default)
3426 /// or +1 (ns_consumed). This must be reflected in the function type,
3427 /// but isn't really a change to the parameter type.
3428 ///
3429 /// One serious disadvantage of modelling language features this way is
3430 /// that they generally do not work with language features that attempt
3431 /// to destructure types. For example, template argument deduction will
3432 /// not be able to match a parameter declared as
3433 /// T (*)(U)
3434 /// against an argument of type
3435 /// void (*)(__attribute__((ns_consumed)) id)
3436 /// because the substitution of T=void, U=id into the former will
3437 /// not produce the latter.
3438 class ExtParameterInfo {
3439 enum {
3440 ABIMask = 0x0F,
3441 IsConsumed = 0x10,
3442 HasPassObjSize = 0x20,
3443 IsNoEscape = 0x40,
3444 };
3445 unsigned char Data = 0;
3446
3447 public:
3448 ExtParameterInfo() = default;
3449
3450 /// Return the ABI treatment of this parameter.
3451 ParameterABI getABI() const { return ParameterABI(Data & ABIMask); }
3452 ExtParameterInfo withABI(ParameterABI kind) const {
3453 ExtParameterInfo copy = *this;
3454 copy.Data = (copy.Data & ~ABIMask) | unsigned(kind);
3455 return copy;
3456 }
3457
3458 /// Is this parameter considered "consumed" by Objective-C ARC?
3459 /// Consumed parameters must have retainable object type.
3460 bool isConsumed() const { return (Data & IsConsumed); }
3461 ExtParameterInfo withIsConsumed(bool consumed) const {
3462 ExtParameterInfo copy = *this;
3463 if (consumed)
3464 copy.Data |= IsConsumed;
3465 else
3466 copy.Data &= ~IsConsumed;
3467 return copy;
3468 }
3469
3470 bool hasPassObjectSize() const { return Data & HasPassObjSize; }
3471 ExtParameterInfo withHasPassObjectSize() const {
3472 ExtParameterInfo Copy = *this;
3473 Copy.Data |= HasPassObjSize;
3474 return Copy;
3475 }
3476
3477 bool isNoEscape() const { return Data & IsNoEscape; }
3478 ExtParameterInfo withIsNoEscape(bool NoEscape) const {
3479 ExtParameterInfo Copy = *this;
3480 if (NoEscape)
3481 Copy.Data |= IsNoEscape;
3482 else
3483 Copy.Data &= ~IsNoEscape;
3484 return Copy;
3485 }
3486
3487 unsigned char getOpaqueValue() const { return Data; }
3488 static ExtParameterInfo getFromOpaqueValue(unsigned char data) {
3489 ExtParameterInfo result;
3490 result.Data = data;
3491 return result;
3492 }
3493
3494 friend bool operator==(ExtParameterInfo lhs, ExtParameterInfo rhs) {
3495 return lhs.Data == rhs.Data;
3496 }
3497
3498 friend bool operator!=(ExtParameterInfo lhs, ExtParameterInfo rhs) {
3499 return lhs.Data != rhs.Data;
3500 }
3501 };
3502
3503 /// A class which abstracts out some details necessary for
3504 /// making a call.
3505 ///
3506 /// It is not actually used directly for storing this information in
3507 /// a FunctionType, although FunctionType does currently use the
3508 /// same bit-pattern.
3509 ///
3510 // If you add a field (say Foo), other than the obvious places (both,
3511 // constructors, compile failures), what you need to update is
3512 // * Operator==
3513 // * getFoo
3514 // * withFoo
3515 // * functionType. Add Foo, getFoo.
3516 // * ASTContext::getFooType
3517 // * ASTContext::mergeFunctionTypes
3518 // * FunctionNoProtoType::Profile
3519 // * FunctionProtoType::Profile
3520 // * TypePrinter::PrintFunctionProto
3521 // * AST read and write
3522 // * Codegen
3523 class ExtInfo {
3524 friend class FunctionType;
3525
3526 // Feel free to rearrange or add bits, but if you go over 12,
3527 // you'll need to adjust both the Bits field below and
3528 // Type::FunctionTypeBitfields.
3529
3530 // | CC |noreturn|produces|nocallersavedregs|regparm|nocfcheck|
3531 // |0 .. 4| 5 | 6 | 7 |8 .. 10| 11 |
3532 //
3533 // regparm is either 0 (no regparm attribute) or the regparm value+1.
3534 enum { CallConvMask = 0x1F };
3535 enum { NoReturnMask = 0x20 };
3536 enum { ProducesResultMask = 0x40 };
3537 enum { NoCallerSavedRegsMask = 0x80 };
3538 enum { NoCfCheckMask = 0x800 };
3539 enum {
3540 RegParmMask = ~(CallConvMask | NoReturnMask | ProducesResultMask |
3541 NoCallerSavedRegsMask | NoCfCheckMask),
3542 RegParmOffset = 8
3543 }; // Assumed to be the last field
3544 uint16_t Bits = CC_C;
3545
3546 ExtInfo(unsigned Bits) : Bits(static_cast<uint16_t>(Bits)) {}
3547
3548 public:
3549 // Constructor with no defaults. Use this when you know that you
3550 // have all the elements (when reading an AST file for example).
3551 ExtInfo(bool noReturn, bool hasRegParm, unsigned regParm, CallingConv cc,
3552 bool producesResult, bool noCallerSavedRegs, bool NoCfCheck) {
3553 assert((!hasRegParm || regParm < 7) && "Invalid regparm value")(((!hasRegParm || regParm < 7) && "Invalid regparm value"
) ? static_cast<void> (0) : __assert_fail ("(!hasRegParm || regParm < 7) && \"Invalid regparm value\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 3553, __PRETTY_FUNCTION__))
;
3554 Bits = ((unsigned)cc) | (noReturn ? NoReturnMask : 0) |
3555 (producesResult ? ProducesResultMask : 0) |
3556 (noCallerSavedRegs ? NoCallerSavedRegsMask : 0) |
3557 (hasRegParm ? ((regParm + 1) << RegParmOffset) : 0) |
3558 (NoCfCheck ? NoCfCheckMask : 0);
3559 }
3560
3561 // Constructor with all defaults. Use when for example creating a
3562 // function known to use defaults.
3563 ExtInfo() = default;
3564
3565 // Constructor with just the calling convention, which is an important part
3566 // of the canonical type.
3567 ExtInfo(CallingConv CC) : Bits(CC) {}
3568
3569 bool getNoReturn() const { return Bits & NoReturnMask; }
3570 bool getProducesResult() const { return Bits & ProducesResultMask; }
3571 bool getNoCallerSavedRegs() const { return Bits & NoCallerSavedRegsMask; }
3572 bool getNoCfCheck() const { return Bits & NoCfCheckMask; }
3573 bool getHasRegParm() const { return (Bits >> RegParmOffset) != 0; }
3574
3575 unsigned getRegParm() const {
3576 unsigned RegParm = (Bits & RegParmMask) >> RegParmOffset;
3577 if (RegParm > 0)
3578 --RegParm;
3579 return RegParm;
3580 }
3581
3582 CallingConv getCC() const { return CallingConv(Bits & CallConvMask); }
3583
3584 bool operator==(ExtInfo Other) const {
3585 return Bits == Other.Bits;
3586 }
3587 bool operator!=(ExtInfo Other) const {
3588 return Bits != Other.Bits;
3589 }
3590
3591 // Note that we don't have setters. That is by design, use
3592 // the following with methods instead of mutating these objects.
3593
3594 ExtInfo withNoReturn(bool noReturn) const {
3595 if (noReturn)
3596 return ExtInfo(Bits | NoReturnMask);
3597 else
3598 return ExtInfo(Bits & ~NoReturnMask);
3599 }
3600
3601 ExtInfo withProducesResult(bool producesResult) const {
3602 if (producesResult)
3603 return ExtInfo(Bits | ProducesResultMask);
3604 else
3605 return ExtInfo(Bits & ~ProducesResultMask);
3606 }
3607
3608 ExtInfo withNoCallerSavedRegs(bool noCallerSavedRegs) const {
3609 if (noCallerSavedRegs)
3610 return ExtInfo(Bits | NoCallerSavedRegsMask);
3611 else
3612 return ExtInfo(Bits & ~NoCallerSavedRegsMask);
3613 }
3614
3615 ExtInfo withNoCfCheck(bool noCfCheck) const {
3616 if (noCfCheck)
3617 return ExtInfo(Bits | NoCfCheckMask);
3618 else
3619 return ExtInfo(Bits & ~NoCfCheckMask);
3620 }
3621
3622 ExtInfo withRegParm(unsigned RegParm) const {
3623 assert(RegParm < 7 && "Invalid regparm value")((RegParm < 7 && "Invalid regparm value") ? static_cast
<void> (0) : __assert_fail ("RegParm < 7 && \"Invalid regparm value\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 3623, __PRETTY_FUNCTION__))
;
3624 return ExtInfo((Bits & ~RegParmMask) |
3625 ((RegParm + 1) << RegParmOffset));
3626 }
3627
3628 ExtInfo withCallingConv(CallingConv cc) const {
3629 return ExtInfo((Bits & ~CallConvMask) | (unsigned) cc);
3630 }
3631
3632 void Profile(llvm::FoldingSetNodeID &ID) const {
3633 ID.AddInteger(Bits);
3634 }
3635 };
3636
3637 /// A simple holder for a QualType representing a type in an
3638 /// exception specification. Unfortunately needed by FunctionProtoType
3639 /// because TrailingObjects cannot handle repeated types.
3640 struct ExceptionType { QualType Type; };
3641
3642 /// A simple holder for various uncommon bits which do not fit in
3643 /// FunctionTypeBitfields. Aligned to alignof(void *) to maintain the
3644 /// alignment of subsequent objects in TrailingObjects. You must update
3645 /// hasExtraBitfields in FunctionProtoType after adding extra data here.
3646 struct alignas(void *) FunctionTypeExtraBitfields {
3647 /// The number of types in the exception specification.
3648 /// A whole unsigned is not needed here and according to
3649 /// [implimits] 8 bits would be enough here.
3650 unsigned NumExceptionType;
3651 };
3652
3653protected:
3654 FunctionType(TypeClass tc, QualType res,
3655 QualType Canonical, bool Dependent,
3656 bool InstantiationDependent,
3657 bool VariablyModified, bool ContainsUnexpandedParameterPack,
3658 ExtInfo Info)
3659 : Type(tc, Canonical, Dependent, InstantiationDependent, VariablyModified,
3660 ContainsUnexpandedParameterPack),
3661 ResultType(res) {
3662 FunctionTypeBits.ExtInfo = Info.Bits;
3663 }
3664
3665 Qualifiers getFastTypeQuals() const {
3666 return Qualifiers::fromFastMask(FunctionTypeBits.FastTypeQuals);
3667 }
3668
3669public:
3670 QualType getReturnType() const { return ResultType; }
3671
3672 bool getHasRegParm() const { return getExtInfo().getHasRegParm(); }
3673 unsigned getRegParmType() const { return getExtInfo().getRegParm(); }
3674
3675 /// Determine whether this function type includes the GNU noreturn
3676 /// attribute. The C++11 [[noreturn]] attribute does not affect the function
3677 /// type.
3678 bool getNoReturnAttr() const { return getExtInfo().getNoReturn(); }
3679
3680 CallingConv getCallConv() const { return getExtInfo().getCC(); }
3681 ExtInfo getExtInfo() const { return ExtInfo(FunctionTypeBits.ExtInfo); }
3682
3683 static_assert((~Qualifiers::FastMask & Qualifiers::CVRMask) == 0,
3684 "Const, volatile and restrict are assumed to be a subset of "
3685 "the fast qualifiers.");
3686
3687 bool isConst() const { return getFastTypeQuals().hasConst(); }
3688 bool isVolatile() const { return getFastTypeQuals().hasVolatile(); }
3689 bool isRestrict() const { return getFastTypeQuals().hasRestrict(); }
3690
3691 /// Determine the type of an expression that calls a function of
3692 /// this type.
3693 QualType getCallResultType(const ASTContext &Context) const {
3694 return getReturnType().getNonLValueExprType(Context);
3695 }
3696
3697 static StringRef getNameForCallConv(CallingConv CC);
3698
3699 static bool classof(const Type *T) {
3700 return T->getTypeClass() == FunctionNoProto ||
3701 T->getTypeClass() == FunctionProto;
3702 }
3703};
3704
3705/// Represents a K&R-style 'int foo()' function, which has
3706/// no information available about its arguments.
3707class FunctionNoProtoType : public FunctionType, public llvm::FoldingSetNode {
3708 friend class ASTContext; // ASTContext creates these.
3709
3710 FunctionNoProtoType(QualType Result, QualType Canonical, ExtInfo Info)
3711 : FunctionType(FunctionNoProto, Result, Canonical,
3712 /*Dependent=*/false, /*InstantiationDependent=*/false,
3713 Result->isVariablyModifiedType(),
3714 /*ContainsUnexpandedParameterPack=*/false, Info) {}
3715
3716public:
3717 // No additional state past what FunctionType provides.
3718
3719 bool isSugared() const { return false; }
3720 QualType desugar() const { return QualType(this, 0); }
3721
3722 void Profile(llvm::FoldingSetNodeID &ID) {
3723 Profile(ID, getReturnType(), getExtInfo());
3724 }
3725
3726 static void Profile(llvm::FoldingSetNodeID &ID, QualType ResultType,
3727 ExtInfo Info) {
3728 Info.Profile(ID);
3729 ID.AddPointer(ResultType.getAsOpaquePtr());
3730 }
3731
3732 static bool classof(const Type *T) {
3733 return T->getTypeClass() == FunctionNoProto;
3734 }
3735};
3736
3737/// Represents a prototype with parameter type info, e.g.
3738/// 'int foo(int)' or 'int foo(void)'. 'void' is represented as having no
3739/// parameters, not as having a single void parameter. Such a type can have
3740/// an exception specification, but this specification is not part of the
3741/// canonical type. FunctionProtoType has several trailing objects, some of
3742/// which optional. For more information about the trailing objects see
3743/// the first comment inside FunctionProtoType.
3744class FunctionProtoType final
3745 : public FunctionType,
3746 public llvm::FoldingSetNode,
3747 private llvm::TrailingObjects<
3748 FunctionProtoType, QualType, SourceLocation,
3749 FunctionType::FunctionTypeExtraBitfields, FunctionType::ExceptionType,
3750 Expr *, FunctionDecl *, FunctionType::ExtParameterInfo, Qualifiers> {
3751 friend class ASTContext; // ASTContext creates these.
3752 friend TrailingObjects;
3753
3754 // FunctionProtoType is followed by several trailing objects, some of
3755 // which optional. They are in order:
3756 //
3757 // * An array of getNumParams() QualType holding the parameter types.
3758 // Always present. Note that for the vast majority of FunctionProtoType,
3759 // these will be the only trailing objects.
3760 //
3761 // * Optionally if the function is variadic, the SourceLocation of the
3762 // ellipsis.
3763 //
3764 // * Optionally if some extra data is stored in FunctionTypeExtraBitfields
3765 // (see FunctionTypeExtraBitfields and FunctionTypeBitfields):
3766 // a single FunctionTypeExtraBitfields. Present if and only if
3767 // hasExtraBitfields() is true.
3768 //
3769 // * Optionally exactly one of:
3770 // * an array of getNumExceptions() ExceptionType,
3771 // * a single Expr *,
3772 // * a pair of FunctionDecl *,
3773 // * a single FunctionDecl *
3774 // used to store information about the various types of exception
3775 // specification. See getExceptionSpecSize for the details.
3776 //
3777 // * Optionally an array of getNumParams() ExtParameterInfo holding
3778 // an ExtParameterInfo for each of the parameters. Present if and
3779 // only if hasExtParameterInfos() is true.
3780 //
3781 // * Optionally a Qualifiers object to represent extra qualifiers that can't
3782 // be represented by FunctionTypeBitfields.FastTypeQuals. Present if and only
3783 // if hasExtQualifiers() is true.
3784 //
3785 // The optional FunctionTypeExtraBitfields has to be before the data
3786 // related to the exception specification since it contains the number
3787 // of exception types.
3788 //
3789 // We put the ExtParameterInfos last. If all were equal, it would make
3790 // more sense to put these before the exception specification, because
3791 // it's much easier to skip past them compared to the elaborate switch
3792 // required to skip the exception specification. However, all is not
3793 // equal; ExtParameterInfos are used to model very uncommon features,
3794 // and it's better not to burden the more common paths.
3795
3796public:
3797 /// Holds information about the various types of exception specification.
3798 /// ExceptionSpecInfo is not stored as such in FunctionProtoType but is
3799 /// used to group together the various bits of information about the
3800 /// exception specification.
3801 struct ExceptionSpecInfo {
3802 /// The kind of exception specification this is.
3803 ExceptionSpecificationType Type = EST_None;
3804
3805 /// Explicitly-specified list of exception types.
3806 ArrayRef<QualType> Exceptions;
3807
3808 /// Noexcept expression, if this is a computed noexcept specification.
3809 Expr *NoexceptExpr = nullptr;
3810
3811 /// The function whose exception specification this is, for
3812 /// EST_Unevaluated and EST_Uninstantiated.
3813 FunctionDecl *SourceDecl = nullptr;
3814
3815 /// The function template whose exception specification this is instantiated
3816 /// from, for EST_Uninstantiated.
3817 FunctionDecl *SourceTemplate = nullptr;
3818
3819 ExceptionSpecInfo() = default;
3820
3821 ExceptionSpecInfo(ExceptionSpecificationType EST) : Type(EST) {}
3822 };
3823
3824 /// Extra information about a function prototype. ExtProtoInfo is not
3825 /// stored as such in FunctionProtoType but is used to group together
3826 /// the various bits of extra information about a function prototype.
3827 struct ExtProtoInfo {
3828 FunctionType::ExtInfo ExtInfo;
3829 bool Variadic : 1;
3830 bool HasTrailingReturn : 1;
3831 Qualifiers TypeQuals;
3832 RefQualifierKind RefQualifier = RQ_None;
3833 ExceptionSpecInfo ExceptionSpec;
3834 const ExtParameterInfo *ExtParameterInfos = nullptr;
3835 SourceLocation EllipsisLoc;
3836
3837 ExtProtoInfo() : Variadic(false), HasTrailingReturn(false) {}
3838
3839 ExtProtoInfo(CallingConv CC)
3840 : ExtInfo(CC), Variadic(false), HasTrailingReturn(false) {}
3841
3842 ExtProtoInfo withExceptionSpec(const ExceptionSpecInfo &ESI) {
3843 ExtProtoInfo Result(*this);
3844 Result.ExceptionSpec = ESI;
3845 return Result;
3846 }
3847 };
3848
3849private:
3850 unsigned numTrailingObjects(OverloadToken<QualType>) const {
3851 return getNumParams();
3852 }
3853
3854 unsigned numTrailingObjects(OverloadToken<SourceLocation>) const {
3855 return isVariadic();
3856 }
3857
3858 unsigned numTrailingObjects(OverloadToken<FunctionTypeExtraBitfields>) const {
3859 return hasExtraBitfields();
3860 }
3861
3862 unsigned numTrailingObjects(OverloadToken<ExceptionType>) const {
3863 return getExceptionSpecSize().NumExceptionType;
3864 }
3865
3866 unsigned numTrailingObjects(OverloadToken<Expr *>) const {
3867 return getExceptionSpecSize().NumExprPtr;
3868 }
3869
3870 unsigned numTrailingObjects(OverloadToken<FunctionDecl *>) const {
3871 return getExceptionSpecSize().NumFunctionDeclPtr;
3872 }
3873
3874 unsigned numTrailingObjects(OverloadToken<ExtParameterInfo>) const {
3875 return hasExtParameterInfos() ? getNumParams() : 0;
3876 }
3877
3878 /// Determine whether there are any argument types that
3879 /// contain an unexpanded parameter pack.
3880 static bool containsAnyUnexpandedParameterPack(const QualType *ArgArray,
3881 unsigned numArgs) {
3882 for (unsigned Idx = 0; Idx < numArgs; ++Idx)
3883 if (ArgArray[Idx]->containsUnexpandedParameterPack())
3884 return true;
3885
3886 return false;
3887 }
3888
3889 FunctionProtoType(QualType result, ArrayRef<QualType> params,
3890 QualType canonical, const ExtProtoInfo &epi);
3891
3892 /// This struct is returned by getExceptionSpecSize and is used to
3893 /// translate an ExceptionSpecificationType to the number and kind
3894 /// of trailing objects related to the exception specification.
3895 struct ExceptionSpecSizeHolder {
3896 unsigned NumExceptionType;
3897 unsigned NumExprPtr;
3898 unsigned NumFunctionDeclPtr;
3899 };
3900
3901 /// Return the number and kind of trailing objects
3902 /// related to the exception specification.
3903 static ExceptionSpecSizeHolder
3904 getExceptionSpecSize(ExceptionSpecificationType EST, unsigned NumExceptions) {
3905 switch (EST) {
3906 case EST_None:
3907 case EST_DynamicNone:
3908 case EST_MSAny:
3909 case EST_BasicNoexcept:
3910 case EST_Unparsed:
3911 case EST_NoThrow:
3912 return {0, 0, 0};
3913
3914 case EST_Dynamic:
3915 return {NumExceptions, 0, 0};
3916
3917 case EST_DependentNoexcept:
3918 case EST_NoexceptFalse:
3919 case EST_NoexceptTrue:
3920 return {0, 1, 0};
3921
3922 case EST_Uninstantiated:
3923 return {0, 0, 2};
3924
3925 case EST_Unevaluated:
3926 return {0, 0, 1};
3927 }
3928 llvm_unreachable("bad exception specification kind")::llvm::llvm_unreachable_internal("bad exception specification kind"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 3928)
;
3929 }
3930
3931 /// Return the number and kind of trailing objects
3932 /// related to the exception specification.
3933 ExceptionSpecSizeHolder getExceptionSpecSize() const {
3934 return getExceptionSpecSize(getExceptionSpecType(), getNumExceptions());
3935 }
3936
3937 /// Whether the trailing FunctionTypeExtraBitfields is present.
3938 static bool hasExtraBitfields(ExceptionSpecificationType EST) {
3939 // If the exception spec type is EST_Dynamic then we have > 0 exception
3940 // types and the exact number is stored in FunctionTypeExtraBitfields.
3941 return EST == EST_Dynamic;
3942 }
3943
3944 /// Whether the trailing FunctionTypeExtraBitfields is present.
3945 bool hasExtraBitfields() const {
3946 return hasExtraBitfields(getExceptionSpecType());
3947 }
3948
3949 bool hasExtQualifiers() const {
3950 return FunctionTypeBits.HasExtQuals;
3951 }
3952
3953public:
3954 unsigned getNumParams() const { return FunctionTypeBits.NumParams; }
3955
3956 QualType getParamType(unsigned i) const {
3957 assert(i < getNumParams() && "invalid parameter index")((i < getNumParams() && "invalid parameter index")
? static_cast<void> (0) : __assert_fail ("i < getNumParams() && \"invalid parameter index\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 3957, __PRETTY_FUNCTION__))
;
3958 return param_type_begin()[i];
3959 }
3960
3961 ArrayRef<QualType> getParamTypes() const {
3962 return llvm::makeArrayRef(param_type_begin(), param_type_end());
3963 }
3964
3965 ExtProtoInfo getExtProtoInfo() const {
3966 ExtProtoInfo EPI;
3967 EPI.ExtInfo = getExtInfo();
3968 EPI.Variadic = isVariadic();
3969 EPI.EllipsisLoc = getEllipsisLoc();
3970 EPI.HasTrailingReturn = hasTrailingReturn();
3971 EPI.ExceptionSpec = getExceptionSpecInfo();
3972 EPI.TypeQuals = getMethodQuals();
3973 EPI.RefQualifier = getRefQualifier();
3974 EPI.ExtParameterInfos = getExtParameterInfosOrNull();
3975 return EPI;
3976 }
3977
3978 /// Get the kind of exception specification on this function.
3979 ExceptionSpecificationType getExceptionSpecType() const {
3980 return static_cast<ExceptionSpecificationType>(
3981 FunctionTypeBits.ExceptionSpecType);
3982 }
3983
3984 /// Return whether this function has any kind of exception spec.
3985 bool hasExceptionSpec() const { return getExceptionSpecType() != EST_None; }
3986
3987 /// Return whether this function has a dynamic (throw) exception spec.
3988 bool hasDynamicExceptionSpec() const {
3989 return isDynamicExceptionSpec(getExceptionSpecType());
3990 }
3991
3992 /// Return whether this function has a noexcept exception spec.
3993 bool hasNoexceptExceptionSpec() const {
3994 return isNoexceptExceptionSpec(getExceptionSpecType());
3995 }
3996
3997 /// Return whether this function has a dependent exception spec.
3998 bool hasDependentExceptionSpec() const;
3999
4000 /// Return whether this function has an instantiation-dependent exception
4001 /// spec.
4002 bool hasInstantiationDependentExceptionSpec() const;
4003
4004 /// Return all the available information about this type's exception spec.
4005 ExceptionSpecInfo getExceptionSpecInfo() const {
4006 ExceptionSpecInfo Result;
4007 Result.Type = getExceptionSpecType();
4008 if (Result.Type == EST_Dynamic) {
4009 Result.Exceptions = exceptions();
4010 } else if (isComputedNoexcept(Result.Type)) {
4011 Result.NoexceptExpr = getNoexceptExpr();
4012 } else if (Result.Type == EST_Uninstantiated) {
4013 Result.SourceDecl = getExceptionSpecDecl();
4014 Result.SourceTemplate = getExceptionSpecTemplate();
4015 } else if (Result.Type == EST_Unevaluated) {
4016 Result.SourceDecl = getExceptionSpecDecl();
4017 }
4018 return Result;
4019 }
4020
4021 /// Return the number of types in the exception specification.
4022 unsigned getNumExceptions() const {
4023 return getExceptionSpecType() == EST_Dynamic
4024 ? getTrailingObjects<FunctionTypeExtraBitfields>()
4025 ->NumExceptionType
4026 : 0;
4027 }
4028
4029 /// Return the ith exception type, where 0 <= i < getNumExceptions().
4030 QualType getExceptionType(unsigned i) const {
4031 assert(i < getNumExceptions() && "Invalid exception number!")((i < getNumExceptions() && "Invalid exception number!"
) ? static_cast<void> (0) : __assert_fail ("i < getNumExceptions() && \"Invalid exception number!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 4031, __PRETTY_FUNCTION__))
;
4032 return exception_begin()[i];
4033 }
4034
4035 /// Return the expression inside noexcept(expression), or a null pointer
4036 /// if there is none (because the exception spec is not of this form).
4037 Expr *getNoexceptExpr() const {
4038 if (!isComputedNoexcept(getExceptionSpecType()))
4039 return nullptr;
4040 return *getTrailingObjects<Expr *>();
4041 }
4042
4043 /// If this function type has an exception specification which hasn't
4044 /// been determined yet (either because it has not been evaluated or because
4045 /// it has not been instantiated), this is the function whose exception
4046 /// specification is represented by this type.
4047 FunctionDecl *getExceptionSpecDecl() const {
4048 if (getExceptionSpecType() != EST_Uninstantiated &&
4049 getExceptionSpecType() != EST_Unevaluated)
4050 return nullptr;
4051 return getTrailingObjects<FunctionDecl *>()[0];
4052 }
4053
4054 /// If this function type has an uninstantiated exception
4055 /// specification, this is the function whose exception specification
4056 /// should be instantiated to find the exception specification for
4057 /// this type.
4058 FunctionDecl *getExceptionSpecTemplate() const {
4059 if (getExceptionSpecType() != EST_Uninstantiated)
4060 return nullptr;
4061 return getTrailingObjects<FunctionDecl *>()[1];
4062 }
4063
4064 /// Determine whether this function type has a non-throwing exception
4065 /// specification.
4066 CanThrowResult canThrow() const;
4067
4068 /// Determine whether this function type has a non-throwing exception
4069 /// specification. If this depends on template arguments, returns
4070 /// \c ResultIfDependent.
4071 bool isNothrow(bool ResultIfDependent = false) const {
4072 return ResultIfDependent ? canThrow() != CT_Can : canThrow() == CT_Cannot;
4073 }
4074
4075 /// Whether this function prototype is variadic.
4076 bool isVariadic() const { return FunctionTypeBits.Variadic; }
4077
4078 SourceLocation getEllipsisLoc() const {
4079 return isVariadic() ? *getTrailingObjects<SourceLocation>()
4080 : SourceLocation();
4081 }
4082
4083 /// Determines whether this function prototype contains a
4084 /// parameter pack at the end.
4085 ///
4086 /// A function template whose last parameter is a parameter pack can be
4087 /// called with an arbitrary number of arguments, much like a variadic
4088 /// function.
4089 bool isTemplateVariadic() const;
4090
4091 /// Whether this function prototype has a trailing return type.
4092 bool hasTrailingReturn() const { return FunctionTypeBits.HasTrailingReturn; }
4093
4094 Qualifiers getMethodQuals() const {
4095 if (hasExtQualifiers())
4096 return *getTrailingObjects<Qualifiers>();
4097 else
4098 return getFastTypeQuals();
4099 }
4100
4101 /// Retrieve the ref-qualifier associated with this function type.
4102 RefQualifierKind getRefQualifier() const {
4103 return static_cast<RefQualifierKind>(FunctionTypeBits.RefQualifier);
4104 }
4105
4106 using param_type_iterator = const QualType *;
4107 using param_type_range = llvm::iterator_range<param_type_iterator>;
4108
4109 param_type_range param_types() const {
4110 return param_type_range(param_type_begin(), param_type_end());
4111 }
4112
4113 param_type_iterator param_type_begin() const {
4114 return getTrailingObjects<QualType>();
4115 }
4116
4117 param_type_iterator param_type_end() const {
4118 return param_type_begin() + getNumParams();
4119 }
4120
4121 using exception_iterator = const QualType *;
4122
4123 ArrayRef<QualType> exceptions() const {
4124 return llvm::makeArrayRef(exception_begin(), exception_end());
4125 }
4126
4127 exception_iterator exception_begin() const {
4128 return reinterpret_cast<exception_iterator>(
4129 getTrailingObjects<ExceptionType>());
4130 }
4131
4132 exception_iterator exception_end() const {
4133 return exception_begin() + getNumExceptions();
4134 }
4135
4136 /// Is there any interesting extra information for any of the parameters
4137 /// of this function type?
4138 bool hasExtParameterInfos() const {
4139 return FunctionTypeBits.HasExtParameterInfos;
4140 }
4141
4142 ArrayRef<ExtParameterInfo> getExtParameterInfos() const {
4143 assert(hasExtParameterInfos())((hasExtParameterInfos()) ? static_cast<void> (0) : __assert_fail
("hasExtParameterInfos()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 4143, __PRETTY_FUNCTION__))
;
4144 return ArrayRef<ExtParameterInfo>(getTrailingObjects<ExtParameterInfo>(),
4145 getNumParams());
4146 }
4147
4148 /// Return a pointer to the beginning of the array of extra parameter
4149 /// information, if present, or else null if none of the parameters
4150 /// carry it. This is equivalent to getExtProtoInfo().ExtParameterInfos.
4151 const ExtParameterInfo *getExtParameterInfosOrNull() const {
4152 if (!hasExtParameterInfos())
4153 return nullptr;
4154 return getTrailingObjects<ExtParameterInfo>();
4155 }
4156
4157 ExtParameterInfo getExtParameterInfo(unsigned I) const {
4158 assert(I < getNumParams() && "parameter index out of range")((I < getNumParams() && "parameter index out of range"
) ? static_cast<void> (0) : __assert_fail ("I < getNumParams() && \"parameter index out of range\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 4158, __PRETTY_FUNCTION__))
;
4159 if (hasExtParameterInfos())
4160 return getTrailingObjects<ExtParameterInfo>()[I];
4161 return ExtParameterInfo();
4162 }
4163
4164 ParameterABI getParameterABI(unsigned I) const {
4165 assert(I < getNumParams() && "parameter index out of range")((I < getNumParams() && "parameter index out of range"
) ? static_cast<void> (0) : __assert_fail ("I < getNumParams() && \"parameter index out of range\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 4165, __PRETTY_FUNCTION__))
;
4166 if (hasExtParameterInfos())
4167 return getTrailingObjects<ExtParameterInfo>()[I].getABI();
4168 return ParameterABI::Ordinary;
4169 }
4170
4171 bool isParamConsumed(unsigned I) const {
4172 assert(I < getNumParams() && "parameter index out of range")((I < getNumParams() && "parameter index out of range"
) ? static_cast<void> (0) : __assert_fail ("I < getNumParams() && \"parameter index out of range\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 4172, __PRETTY_FUNCTION__))
;
4173 if (hasExtParameterInfos())
4174 return getTrailingObjects<ExtParameterInfo>()[I].isConsumed();
4175 return false;
4176 }
4177
4178 bool isSugared() const { return false; }
4179 QualType desugar() const { return QualType(this, 0); }
4180
4181 void printExceptionSpecification(raw_ostream &OS,
4182 const PrintingPolicy &Policy) const;
4183
4184 static bool classof(const Type *T) {
4185 return T->getTypeClass() == FunctionProto;
4186 }
4187
4188 void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Ctx);
4189 static void Profile(llvm::FoldingSetNodeID &ID, QualType Result,
4190 param_type_iterator ArgTys, unsigned NumArgs,
4191 const ExtProtoInfo &EPI, const ASTContext &Context,
4192 bool Canonical);
4193};
4194
4195/// Represents the dependent type named by a dependently-scoped
4196/// typename using declaration, e.g.
4197/// using typename Base<T>::foo;
4198///
4199/// Template instantiation turns these into the underlying type.
4200class UnresolvedUsingType : public Type {
4201 friend class ASTContext; // ASTContext creates these.
4202
4203 UnresolvedUsingTypenameDecl *Decl;
4204
4205 UnresolvedUsingType(const UnresolvedUsingTypenameDecl *D)
4206 : Type(UnresolvedUsing, QualType(), true, true, false,
4207 /*ContainsUnexpandedParameterPack=*/false),
4208 Decl(const_cast<UnresolvedUsingTypenameDecl*>(D)) {}
4209
4210public:
4211 UnresolvedUsingTypenameDecl *getDecl() const { return Decl; }
4212
4213 bool isSugared() const { return false; }
4214 QualType desugar() const { return QualType(this, 0); }
4215
4216 static bool classof(const Type *T) {
4217 return T->getTypeClass() == UnresolvedUsing;
4218 }
4219
4220 void Profile(llvm::FoldingSetNodeID &ID) {
4221 return Profile(ID, Decl);
4222 }
4223
4224 static void Profile(llvm::FoldingSetNodeID &ID,
4225 UnresolvedUsingTypenameDecl *D) {
4226 ID.AddPointer(D);
4227 }
4228};
4229
4230class TypedefType : public Type {
4231 TypedefNameDecl *Decl;
4232
4233protected:
4234 friend class ASTContext; // ASTContext creates these.
4235
4236 TypedefType(TypeClass tc, const TypedefNameDecl *D, QualType can)
4237 : Type(tc, can, can->isDependentType(),
4238 can->isInstantiationDependentType(),
4239 can->isVariablyModifiedType(),
4240 /*ContainsUnexpandedParameterPack=*/false),
4241 Decl(const_cast<TypedefNameDecl*>(D)) {
4242 assert(!isa<TypedefType>(can) && "Invalid canonical type")((!isa<TypedefType>(can) && "Invalid canonical type"
) ? static_cast<void> (0) : __assert_fail ("!isa<TypedefType>(can) && \"Invalid canonical type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 4242, __PRETTY_FUNCTION__))
;
4243 }
4244
4245public:
4246 TypedefNameDecl *getDecl() const { return Decl; }
4247
4248 bool isSugared() const { return true; }
4249 QualType desugar() const;
4250
4251 static bool classof(const Type *T) { return T->getTypeClass() == Typedef; }
4252};
4253
4254/// Sugar type that represents a type that was qualified by a qualifier written
4255/// as a macro invocation.
4256class MacroQualifiedType : public Type {
4257 friend class ASTContext; // ASTContext creates these.
4258
4259 QualType UnderlyingTy;
4260 const IdentifierInfo *MacroII;
4261
4262 MacroQualifiedType(QualType UnderlyingTy, QualType CanonTy,
4263 const IdentifierInfo *MacroII)
4264 : Type(MacroQualified, CanonTy, UnderlyingTy->isDependentType(),
4265 UnderlyingTy->isInstantiationDependentType(),
4266 UnderlyingTy->isVariablyModifiedType(),
4267 UnderlyingTy->containsUnexpandedParameterPack()),
4268 UnderlyingTy(UnderlyingTy), MacroII(MacroII) {
4269 assert(isa<AttributedType>(UnderlyingTy) &&((isa<AttributedType>(UnderlyingTy) && "Expected a macro qualified type to only wrap attributed types."
) ? static_cast<void> (0) : __assert_fail ("isa<AttributedType>(UnderlyingTy) && \"Expected a macro qualified type to only wrap attributed types.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 4270, __PRETTY_FUNCTION__))
4270 "Expected a macro qualified type to only wrap attributed types.")((isa<AttributedType>(UnderlyingTy) && "Expected a macro qualified type to only wrap attributed types."
) ? static_cast<void> (0) : __assert_fail ("isa<AttributedType>(UnderlyingTy) && \"Expected a macro qualified type to only wrap attributed types.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 4270, __PRETTY_FUNCTION__))
;
4271 }
4272
4273public:
4274 const IdentifierInfo *getMacroIdentifier() const { return MacroII; }
4275 QualType getUnderlyingType() const { return UnderlyingTy; }
4276
4277 /// Return this attributed type's modified type with no qualifiers attached to
4278 /// it.
4279 QualType getModifiedType() const;
4280
4281 bool isSugared() const { return true; }
4282 QualType desugar() const;
4283
4284 static bool classof(const Type *T) {
4285 return T->getTypeClass() == MacroQualified;
4286 }
4287};
4288
4289/// Represents a `typeof` (or __typeof__) expression (a GCC extension).
4290class TypeOfExprType : public Type {
4291 Expr *TOExpr;
4292
4293protected:
4294 friend class ASTContext; // ASTContext creates these.
4295
4296 TypeOfExprType(Expr *E, QualType can = QualType());
4297
4298public:
4299 Expr *getUnderlyingExpr() const { return TOExpr; }
4300
4301 /// Remove a single level of sugar.
4302 QualType desugar() const;
4303
4304 /// Returns whether this type directly provides sugar.
4305 bool isSugared() const;
4306
4307 static bool classof(const Type *T) { return T->getTypeClass() == TypeOfExpr; }
4308};
4309
4310/// Internal representation of canonical, dependent
4311/// `typeof(expr)` types.
4312///
4313/// This class is used internally by the ASTContext to manage
4314/// canonical, dependent types, only. Clients will only see instances
4315/// of this class via TypeOfExprType nodes.
4316class DependentTypeOfExprType
4317 : public TypeOfExprType, public llvm::FoldingSetNode {
4318 const ASTContext &Context;
4319
4320public:
4321 DependentTypeOfExprType(const ASTContext &Context, Expr *E)
4322 : TypeOfExprType(E), Context(Context) {}
4323
4324 void Profile(llvm::FoldingSetNodeID &ID) {
4325 Profile(ID, Context, getUnderlyingExpr());
4326 }
4327
4328 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
4329 Expr *E);
4330};
4331
4332/// Represents `typeof(type)`, a GCC extension.
4333class TypeOfType : public Type {
4334 friend class ASTContext; // ASTContext creates these.
4335
4336 QualType TOType;
4337
4338 TypeOfType(QualType T, QualType can)
4339 : Type(TypeOf, can, T->isDependentType(),
4340 T->isInstantiationDependentType(),
4341 T->isVariablyModifiedType(),
4342 T->containsUnexpandedParameterPack()),
4343 TOType(T) {
4344 assert(!isa<TypedefType>(can) && "Invalid canonical type")((!isa<TypedefType>(can) && "Invalid canonical type"
) ? static_cast<void> (0) : __assert_fail ("!isa<TypedefType>(can) && \"Invalid canonical type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 4344, __PRETTY_FUNCTION__))
;
4345 }
4346
4347public:
4348 QualType getUnderlyingType() const { return TOType; }
4349
4350 /// Remove a single level of sugar.
4351 QualType desugar() const { return getUnderlyingType(); }
4352
4353 /// Returns whether this type directly provides sugar.
4354 bool isSugared() const { return true; }
4355
4356 static bool classof(const Type *T) { return T->getTypeClass() == TypeOf; }
4357};
4358
4359/// Represents the type `decltype(expr)` (C++11).
4360class DecltypeType : public Type {
4361 Expr *E;
4362 QualType UnderlyingType;
4363
4364protected:
4365 friend class ASTContext; // ASTContext creates these.
4366
4367 DecltypeType(Expr *E, QualType underlyingType, QualType can = QualType());
4368
4369public:
4370 Expr *getUnderlyingExpr() const { return E; }
4371 QualType getUnderlyingType() const { return UnderlyingType; }
4372
4373 /// Remove a single level of sugar.
4374 QualType desugar() const;
4375
4376 /// Returns whether this type directly provides sugar.
4377 bool isSugared() const;
4378
4379 static bool classof(const Type *T) { return T->getTypeClass() == Decltype; }
4380};
4381
4382/// Internal representation of canonical, dependent
4383/// decltype(expr) types.
4384///
4385/// This class is used internally by the ASTContext to manage
4386/// canonical, dependent types, only. Clients will only see instances
4387/// of this class via DecltypeType nodes.
4388class DependentDecltypeType : public DecltypeType, public llvm::FoldingSetNode {
4389 const ASTContext &Context;
4390
4391public:
4392 DependentDecltypeType(const ASTContext &Context, Expr *E);
4393
4394 void Profile(llvm::FoldingSetNodeID &ID) {
4395 Profile(ID, Context, getUnderlyingExpr());
4396 }
4397
4398 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context,
4399 Expr *E);
4400};
4401
4402/// A unary type transform, which is a type constructed from another.
4403class UnaryTransformType : public Type {
4404public:
4405 enum UTTKind {
4406 EnumUnderlyingType
4407 };
4408
4409private:
4410 /// The untransformed type.
4411 QualType BaseType;
4412
4413 /// The transformed type if not dependent, otherwise the same as BaseType.
4414 QualType UnderlyingType;
4415
4416 UTTKind UKind;
4417
4418protected:
4419 friend class ASTContext;
4420
4421 UnaryTransformType(QualType BaseTy, QualType UnderlyingTy, UTTKind UKind,
4422 QualType CanonicalTy);
4423
4424public:
4425 bool isSugared() const { return !isDependentType(); }
4426 QualType desugar() const { return UnderlyingType; }
4427
4428 QualType getUnderlyingType() const { return UnderlyingType; }
4429 QualType getBaseType() const { return BaseType; }
4430
4431 UTTKind getUTTKind() const { return UKind; }
4432
4433 static bool classof(const Type *T) {
4434 return T->getTypeClass() == UnaryTransform;
4435 }
4436};
4437
4438/// Internal representation of canonical, dependent
4439/// __underlying_type(type) types.
4440///
4441/// This class is used internally by the ASTContext to manage
4442/// canonical, dependent types, only. Clients will only see instances
4443/// of this class via UnaryTransformType nodes.
4444class DependentUnaryTransformType : public UnaryTransformType,
4445 public llvm::FoldingSetNode {
4446public:
4447 DependentUnaryTransformType(const ASTContext &C, QualType BaseType,
4448 UTTKind UKind);
4449
4450 void Profile(llvm::FoldingSetNodeID &ID) {
4451 Profile(ID, getBaseType(), getUTTKind());
4452 }
4453
4454 static void Profile(llvm::FoldingSetNodeID &ID, QualType BaseType,
4455 UTTKind UKind) {
4456 ID.AddPointer(BaseType.getAsOpaquePtr());
4457 ID.AddInteger((unsigned)UKind);
4458 }
4459};
4460
4461class TagType : public Type {
4462 friend class ASTReader;
4463 template <class T> friend class serialization::AbstractTypeReader;
4464
4465 /// Stores the TagDecl associated with this type. The decl may point to any
4466 /// TagDecl that declares the entity.
4467 TagDecl *decl;
4468
4469protected:
4470 TagType(TypeClass TC, const TagDecl *D, QualType can);
4471
4472public:
4473 TagDecl *getDecl() const;
4474
4475 /// Determines whether this type is in the process of being defined.
4476 bool isBeingDefined() const;
4477
4478 static bool classof(const Type *T) {
4479 return T->getTypeClass() == Enum || T->getTypeClass() == Record;
4480 }
4481};
4482
4483/// A helper class that allows the use of isa/cast/dyncast
4484/// to detect TagType objects of structs/unions/classes.
4485class RecordType : public TagType {
4486protected:
4487 friend class ASTContext; // ASTContext creates these.
4488
4489 explicit RecordType(const RecordDecl *D)
4490 : TagType(Record, reinterpret_cast<const TagDecl*>(D), QualType()) {}
4491 explicit RecordType(TypeClass TC, RecordDecl *D)
4492 : TagType(TC, reinterpret_cast<const TagDecl*>(D), QualType()) {}
4493
4494public:
4495 RecordDecl *getDecl() const {
4496 return reinterpret_cast<RecordDecl*>(TagType::getDecl());
4497 }
4498
4499 /// Recursively check all fields in the record for const-ness. If any field
4500 /// is declared const, return true. Otherwise, return false.
4501 bool hasConstFields() const;
4502
4503 bool isSugared() const { return false; }
4504 QualType desugar() const { return QualType(this, 0); }
4505
4506 static bool classof(const Type *T) { return T->getTypeClass() == Record; }
4507};
4508
4509/// A helper class that allows the use of isa/cast/dyncast
4510/// to detect TagType objects of enums.
4511class EnumType : public TagType {
4512 friend class ASTContext; // ASTContext creates these.
4513
4514 explicit EnumType(const EnumDecl *D)
4515 : TagType(Enum, reinterpret_cast<const TagDecl*>(D), QualType()) {}
4516
4517public:
4518 EnumDecl *getDecl() const {
4519 return reinterpret_cast<EnumDecl*>(TagType::getDecl());
4520 }
4521
4522 bool isSugared() const { return false; }
4523 QualType desugar() const { return QualType(this, 0); }
4524
4525 static bool classof(const Type *T) { return T->getTypeClass() == Enum; }
4526};
4527
4528/// An attributed type is a type to which a type attribute has been applied.
4529///
4530/// The "modified type" is the fully-sugared type to which the attributed
4531/// type was applied; generally it is not canonically equivalent to the
4532/// attributed type. The "equivalent type" is the minimally-desugared type
4533/// which the type is canonically equivalent to.
4534///
4535/// For example, in the following attributed type:
4536/// int32_t __attribute__((vector_size(16)))
4537/// - the modified type is the TypedefType for int32_t
4538/// - the equivalent type is VectorType(16, int32_t)
4539/// - the canonical type is VectorType(16, int)
4540class AttributedType : public Type, public llvm::FoldingSetNode {
4541public:
4542 using Kind = attr::Kind;
4543
4544private:
4545 friend class ASTContext; // ASTContext creates these
4546
4547 QualType ModifiedType;
4548 QualType EquivalentType;
4549
4550 AttributedType(QualType canon, attr::Kind attrKind, QualType modified,
4551 QualType equivalent)
4552 : Type(Attributed, canon, equivalent->isDependentType(),
4553 equivalent->isInstantiationDependentType(),
4554 equivalent->isVariablyModifiedType(),
4555 equivalent->containsUnexpandedParameterPack()),
4556 ModifiedType(modified), EquivalentType(equivalent) {
4557 AttributedTypeBits.AttrKind = attrKind;
4558 }
4559
4560public:
4561 Kind getAttrKind() const {
4562 return static_cast<Kind>(AttributedTypeBits.AttrKind);
4563 }
4564
4565 QualType getModifiedType() const { return ModifiedType; }
4566 QualType getEquivalentType() const { return EquivalentType; }
4567
4568 bool isSugared() const { return true; }
4569 QualType desugar() const { return getEquivalentType(); }
4570
4571 /// Does this attribute behave like a type qualifier?
4572 ///
4573 /// A type qualifier adjusts a type to provide specialized rules for
4574 /// a specific object, like the standard const and volatile qualifiers.
4575 /// This includes attributes controlling things like nullability,
4576 /// address spaces, and ARC ownership. The value of the object is still
4577 /// largely described by the modified type.
4578 ///
4579 /// In contrast, many type attributes "rewrite" their modified type to
4580 /// produce a fundamentally different type, not necessarily related in any
4581 /// formalizable way to the original type. For example, calling convention
4582 /// and vector attributes are not simple type qualifiers.
4583 ///
4584 /// Type qualifiers are often, but not always, reflected in the canonical
4585 /// type.
4586 bool isQualifier() const;
4587
4588 bool isMSTypeSpec() const;
4589
4590 bool isCallingConv() const;
4591
4592 llvm::Optional<NullabilityKind> getImmediateNullability() const;
4593
4594 /// Retrieve the attribute kind corresponding to the given
4595 /// nullability kind.
4596 static Kind getNullabilityAttrKind(NullabilityKind kind) {
4597 switch (kind) {
4598 case NullabilityKind::NonNull:
4599 return attr::TypeNonNull;
4600
4601 case NullabilityKind::Nullable:
4602 return attr::TypeNullable;
4603
4604 case NullabilityKind::Unspecified:
4605 return attr::TypeNullUnspecified;
4606 }
4607 llvm_unreachable("Unknown nullability kind.")::llvm::llvm_unreachable_internal("Unknown nullability kind."
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 4607)
;
4608 }
4609
4610 /// Strip off the top-level nullability annotation on the given
4611 /// type, if it's there.
4612 ///
4613 /// \param T The type to strip. If the type is exactly an
4614 /// AttributedType specifying nullability (without looking through
4615 /// type sugar), the nullability is returned and this type changed
4616 /// to the underlying modified type.
4617 ///
4618 /// \returns the top-level nullability, if present.
4619 static Optional<NullabilityKind> stripOuterNullability(QualType &T);
4620
4621 void Profile(llvm::FoldingSetNodeID &ID) {
4622 Profile(ID, getAttrKind(), ModifiedType, EquivalentType);
4623 }
4624
4625 static void Profile(llvm::FoldingSetNodeID &ID, Kind attrKind,
4626 QualType modified, QualType equivalent) {
4627 ID.AddInteger(attrKind);
4628 ID.AddPointer(modified.getAsOpaquePtr());
4629 ID.AddPointer(equivalent.getAsOpaquePtr());
4630 }
4631
4632 static bool classof(const Type *T) {
4633 return T->getTypeClass() == Attributed;
4634 }
4635};
4636
4637class TemplateTypeParmType : public Type, public llvm::FoldingSetNode {
4638 friend class ASTContext; // ASTContext creates these
4639
4640 // Helper data collector for canonical types.
4641 struct CanonicalTTPTInfo {
4642 unsigned Depth : 15;
4643 unsigned ParameterPack : 1;
4644 unsigned Index : 16;
4645 };
4646
4647 union {
4648 // Info for the canonical type.
4649 CanonicalTTPTInfo CanTTPTInfo;
4650
4651 // Info for the non-canonical type.
4652 TemplateTypeParmDecl *TTPDecl;
4653 };
4654
4655 /// Build a non-canonical type.
4656 TemplateTypeParmType(TemplateTypeParmDecl *TTPDecl, QualType Canon)
4657 : Type(TemplateTypeParm, Canon, /*Dependent=*/true,
4658 /*InstantiationDependent=*/true,
4659 /*VariablyModified=*/false,
4660 Canon->containsUnexpandedParameterPack()),
4661 TTPDecl(TTPDecl) {}
4662
4663 /// Build the canonical type.
4664 TemplateTypeParmType(unsigned D, unsigned I, bool PP)
4665 : Type(TemplateTypeParm, QualType(this, 0),
4666 /*Dependent=*/true,
4667 /*InstantiationDependent=*/true,
4668 /*VariablyModified=*/false, PP) {
4669 CanTTPTInfo.Depth = D;
4670 CanTTPTInfo.Index = I;
4671 CanTTPTInfo.ParameterPack = PP;
4672 }
4673
4674 const CanonicalTTPTInfo& getCanTTPTInfo() const {
4675 QualType Can = getCanonicalTypeInternal();
4676 return Can->castAs<TemplateTypeParmType>()->CanTTPTInfo;
4677 }
4678
4679public:
4680 unsigned getDepth() const { return getCanTTPTInfo().Depth; }
4681 unsigned getIndex() const { return getCanTTPTInfo().Index; }
4682 bool isParameterPack() const { return getCanTTPTInfo().ParameterPack; }
4683
4684 TemplateTypeParmDecl *getDecl() const {
4685 return isCanonicalUnqualified() ? nullptr : TTPDecl;
4686 }
4687
4688 IdentifierInfo *getIdentifier() const;
4689
4690 bool isSugared() const { return false; }
4691 QualType desugar() const { return QualType(this, 0); }
4692
4693 void Profile(llvm::FoldingSetNodeID &ID) {
4694 Profile(ID, getDepth(), getIndex(), isParameterPack(), getDecl());
4695 }
4696
4697 static void Profile(llvm::FoldingSetNodeID &ID, unsigned Depth,
4698 unsigned Index, bool ParameterPack,
4699 TemplateTypeParmDecl *TTPDecl) {
4700 ID.AddInteger(Depth);
4701 ID.AddInteger(Index);
4702 ID.AddBoolean(ParameterPack);
4703 ID.AddPointer(TTPDecl);
4704 }
4705
4706 static bool classof(const Type *T) {
4707 return T->getTypeClass() == TemplateTypeParm;
4708 }
4709};
4710
4711/// Represents the result of substituting a type for a template
4712/// type parameter.
4713///
4714/// Within an instantiated template, all template type parameters have
4715/// been replaced with these. They are used solely to record that a
4716/// type was originally written as a template type parameter;
4717/// therefore they are never canonical.
4718class SubstTemplateTypeParmType : public Type, public llvm::FoldingSetNode {
4719 friend class ASTContext;
4720
4721 // The original type parameter.
4722 const TemplateTypeParmType *Replaced;
4723
4724 SubstTemplateTypeParmType(const TemplateTypeParmType *Param, QualType Canon)
4725 : Type(SubstTemplateTypeParm, Canon, Canon->isDependentType(),
4726 Canon->isInstantiationDependentType(),
4727 Canon->isVariablyModifiedType(),
4728 Canon->containsUnexpandedParameterPack()),
4729 Replaced(Param) {}
4730
4731public:
4732 /// Gets the template parameter that was substituted for.
4733 const TemplateTypeParmType *getReplacedParameter() const {
4734 return Replaced;
4735 }
4736
4737 /// Gets the type that was substituted for the template
4738 /// parameter.
4739 QualType getReplacementType() const {
4740 return getCanonicalTypeInternal();
4741 }
4742
4743 bool isSugared() const { return true; }
4744 QualType desugar() const { return getReplacementType(); }
4745
4746 void Profile(llvm::FoldingSetNodeID &ID) {
4747 Profile(ID, getReplacedParameter(), getReplacementType());
4748 }
4749
4750 static void Profile(llvm::FoldingSetNodeID &ID,
4751 const TemplateTypeParmType *Replaced,
4752 QualType Replacement) {
4753 ID.AddPointer(Replaced);
4754 ID.AddPointer(Replacement.getAsOpaquePtr());
4755 }
4756
4757 static bool classof(const Type *T) {
4758 return T->getTypeClass() == SubstTemplateTypeParm;
4759 }
4760};
4761
4762/// Represents the result of substituting a set of types for a template
4763/// type parameter pack.
4764///
4765/// When a pack expansion in the source code contains multiple parameter packs
4766/// and those parameter packs correspond to different levels of template
4767/// parameter lists, this type node is used to represent a template type
4768/// parameter pack from an outer level, which has already had its argument pack
4769/// substituted but that still lives within a pack expansion that itself
4770/// could not be instantiated. When actually performing a substitution into
4771/// that pack expansion (e.g., when all template parameters have corresponding
4772/// arguments), this type will be replaced with the \c SubstTemplateTypeParmType
4773/// at the current pack substitution index.
4774class SubstTemplateTypeParmPackType : public Type, public llvm::FoldingSetNode {
4775 friend class ASTContext;
4776
4777 /// The original type parameter.
4778 const TemplateTypeParmType *Replaced;
4779
4780 /// A pointer to the set of template arguments that this
4781 /// parameter pack is instantiated with.
4782 const TemplateArgument *Arguments;
4783
4784 SubstTemplateTypeParmPackType(const TemplateTypeParmType *Param,
4785 QualType Canon,
4786 const TemplateArgument &ArgPack);
4787
4788public:
4789 IdentifierInfo *getIdentifier() const { return Replaced->getIdentifier(); }
4790
4791 /// Gets the template parameter that was substituted for.
4792 const TemplateTypeParmType *getReplacedParameter() const {
4793 return Replaced;
4794 }
4795
4796 unsigned getNumArgs() const {
4797 return SubstTemplateTypeParmPackTypeBits.NumArgs;
4798 }
4799
4800 bool isSugared() const { return false; }
4801 QualType desugar() const { return QualType(this, 0); }
4802
4803 TemplateArgument getArgumentPack() const;
4804
4805 void Profile(llvm::FoldingSetNodeID &ID);
4806 static void Profile(llvm::FoldingSetNodeID &ID,
4807 const TemplateTypeParmType *Replaced,
4808 const TemplateArgument &ArgPack);
4809
4810 static bool classof(const Type *T) {
4811 return T->getTypeClass() == SubstTemplateTypeParmPack;
4812 }
4813};
4814
4815/// Common base class for placeholders for types that get replaced by
4816/// placeholder type deduction: C++11 auto, C++14 decltype(auto), C++17 deduced
4817/// class template types, and (eventually) constrained type names from the C++
4818/// Concepts TS.
4819///
4820/// These types are usually a placeholder for a deduced type. However, before
4821/// the initializer is attached, or (usually) if the initializer is
4822/// type-dependent, there is no deduced type and the type is canonical. In
4823/// the latter case, it is also a dependent type.
4824class DeducedType : public Type {
4825protected:
4826 DeducedType(TypeClass TC, QualType DeducedAsType, bool IsDependent,
4827 bool IsInstantiationDependent, bool ContainsParameterPack)
4828 : Type(TC,
4829 // FIXME: Retain the sugared deduced type?
4830 DeducedAsType.isNull() ? QualType(this, 0)
4831 : DeducedAsType.getCanonicalType(),
4832 IsDependent, IsInstantiationDependent,
4833 /*VariablyModified=*/false, ContainsParameterPack) {
4834 if (!DeducedAsType.isNull()) {
4835 if (DeducedAsType->isDependentType())
4836 setDependent();
4837 if (DeducedAsType->isInstantiationDependentType())
4838 setInstantiationDependent();
4839 if (DeducedAsType->containsUnexpandedParameterPack())
4840 setContainsUnexpandedParameterPack();
4841 }
4842 }
4843
4844public:
4845 bool isSugared() const { return !isCanonicalUnqualified(); }
4846 QualType desugar() const { return getCanonicalTypeInternal(); }
4847
4848 /// Get the type deduced for this placeholder type, or null if it's
4849 /// either not been deduced or was deduced to a dependent type.
4850 QualType getDeducedType() const {
4851 return !isCanonicalUnqualified() ? getCanonicalTypeInternal() : QualType();
4852 }
4853 bool isDeduced() const {
4854 return !isCanonicalUnqualified() || isDependentType();
4855 }
4856
4857 static bool classof(const Type *T) {
4858 return T->getTypeClass() == Auto ||
4859 T->getTypeClass() == DeducedTemplateSpecialization;
4860 }
4861};
4862
4863/// Represents a C++11 auto or C++14 decltype(auto) type.
4864class AutoType : public DeducedType, public llvm::FoldingSetNode {
4865 friend class ASTContext; // ASTContext creates these
4866
4867 AutoType(QualType DeducedAsType, AutoTypeKeyword Keyword,
4868 bool IsDeducedAsDependent, bool IsDeducedAsPack)
4869 : DeducedType(Auto, DeducedAsType, IsDeducedAsDependent,
4870 IsDeducedAsDependent, IsDeducedAsPack) {
4871 AutoTypeBits.Keyword = (unsigned)Keyword;
4872 }
4873
4874public:
4875 bool isDecltypeAuto() const {
4876 return getKeyword() == AutoTypeKeyword::DecltypeAuto;
4877 }
4878
4879 AutoTypeKeyword getKeyword() const {
4880 return (AutoTypeKeyword)AutoTypeBits.Keyword;
4881 }
4882
4883 void Profile(llvm::FoldingSetNodeID &ID) {
4884 Profile(ID, getDeducedType(), getKeyword(), isDependentType(),
4885 containsUnexpandedParameterPack());
4886 }
4887
4888 static void Profile(llvm::FoldingSetNodeID &ID, QualType Deduced,
4889 AutoTypeKeyword Keyword, bool IsDependent, bool IsPack) {
4890 ID.AddPointer(Deduced.getAsOpaquePtr());
4891 ID.AddInteger((unsigned)Keyword);
4892 ID.AddBoolean(IsDependent);
4893 ID.AddBoolean(IsPack);
4894 }
4895
4896 static bool classof(const Type *T) {
4897 return T->getTypeClass() == Auto;
4898 }
4899};
4900
4901/// Represents a C++17 deduced template specialization type.
4902class DeducedTemplateSpecializationType : public DeducedType,
4903 public llvm::FoldingSetNode {
4904 friend class ASTContext; // ASTContext creates these
4905
4906 /// The name of the template whose arguments will be deduced.
4907 TemplateName Template;
4908
4909 DeducedTemplateSpecializationType(TemplateName Template,
4910 QualType DeducedAsType,
4911 bool IsDeducedAsDependent)
4912 : DeducedType(DeducedTemplateSpecialization, DeducedAsType,
4913 IsDeducedAsDependent || Template.isDependent(),
4914 IsDeducedAsDependent || Template.isInstantiationDependent(),
4915 Template.containsUnexpandedParameterPack()),
4916 Template(Template) {}
4917
4918public:
4919 /// Retrieve the name of the template that we are deducing.
4920 TemplateName getTemplateName() const { return Template;}
4921
4922 void Profile(llvm::FoldingSetNodeID &ID) {
4923 Profile(ID, getTemplateName(), getDeducedType(), isDependentType());
4924 }
4925
4926 static void Profile(llvm::FoldingSetNodeID &ID, TemplateName Template,
4927 QualType Deduced, bool IsDependent) {
4928 Template.Profile(ID);
4929 ID.AddPointer(Deduced.getAsOpaquePtr());
4930 ID.AddBoolean(IsDependent);
4931 }
4932
4933 static bool classof(const Type *T) {
4934 return T->getTypeClass() == DeducedTemplateSpecialization;
4935 }
4936};
4937
4938/// Represents a type template specialization; the template
4939/// must be a class template, a type alias template, or a template
4940/// template parameter. A template which cannot be resolved to one of
4941/// these, e.g. because it is written with a dependent scope
4942/// specifier, is instead represented as a
4943/// @c DependentTemplateSpecializationType.
4944///
4945/// A non-dependent template specialization type is always "sugar",
4946/// typically for a \c RecordType. For example, a class template
4947/// specialization type of \c vector<int> will refer to a tag type for
4948/// the instantiation \c std::vector<int, std::allocator<int>>
4949///
4950/// Template specializations are dependent if either the template or
4951/// any of the template arguments are dependent, in which case the
4952/// type may also be canonical.
4953///
4954/// Instances of this type are allocated with a trailing array of
4955/// TemplateArguments, followed by a QualType representing the
4956/// non-canonical aliased type when the template is a type alias
4957/// template.
4958class alignas(8) TemplateSpecializationType
4959 : public Type,
4960 public llvm::FoldingSetNode {
4961 friend class ASTContext; // ASTContext creates these
4962
4963 /// The name of the template being specialized. This is
4964 /// either a TemplateName::Template (in which case it is a
4965 /// ClassTemplateDecl*, a TemplateTemplateParmDecl*, or a
4966 /// TypeAliasTemplateDecl*), a
4967 /// TemplateName::SubstTemplateTemplateParmPack, or a
4968 /// TemplateName::SubstTemplateTemplateParm (in which case the
4969 /// replacement must, recursively, be one of these).
4970 TemplateName Template;
4971
4972 TemplateSpecializationType(TemplateName T,
4973 ArrayRef<TemplateArgument> Args,
4974 QualType Canon,
4975 QualType Aliased);
4976
4977public:
4978 /// Determine whether any of the given template arguments are dependent.
4979 static bool anyDependentTemplateArguments(ArrayRef<TemplateArgumentLoc> Args,
4980 bool &InstantiationDependent);
4981
4982 static bool anyDependentTemplateArguments(const TemplateArgumentListInfo &,
4983 bool &InstantiationDependent);
4984
4985 /// True if this template specialization type matches a current
4986 /// instantiation in the context in which it is found.
4987 bool isCurrentInstantiation() const {
4988 return isa<InjectedClassNameType>(getCanonicalTypeInternal());
4989 }
4990
4991 /// Determine if this template specialization type is for a type alias
4992 /// template that has been substituted.
4993 ///
4994 /// Nearly every template specialization type whose template is an alias
4995 /// template will be substituted. However, this is not the case when
4996 /// the specialization contains a pack expansion but the template alias
4997 /// does not have a corresponding parameter pack, e.g.,
4998 ///
4999 /// \code
5000 /// template<typename T, typename U, typename V> struct S;
5001 /// template<typename T, typename U> using A = S<T, int, U>;
5002 /// template<typename... Ts> struct X {
5003 /// typedef A<Ts...> type; // not a type alias
5004 /// };
5005 /// \endcode
5006 bool isTypeAlias() const { return TemplateSpecializationTypeBits.TypeAlias; }
5007
5008 /// Get the aliased type, if this is a specialization of a type alias
5009 /// template.
5010 QualType getAliasedType() const {
5011 assert(isTypeAlias() && "not a type alias template specialization")((isTypeAlias() && "not a type alias template specialization"
) ? static_cast<void> (0) : __assert_fail ("isTypeAlias() && \"not a type alias template specialization\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 5011, __PRETTY_FUNCTION__))
;
5012 return *reinterpret_cast<const QualType*>(end());
5013 }
5014
5015 using iterator = const TemplateArgument *;
5016
5017 iterator begin() const { return getArgs(); }
5018 iterator end() const; // defined inline in TemplateBase.h
5019
5020 /// Retrieve the name of the template that we are specializing.
5021 TemplateName getTemplateName() const { return Template; }
5022
5023 /// Retrieve the template arguments.
5024 const TemplateArgument *getArgs() const {
5025 return reinterpret_cast<const TemplateArgument *>(this + 1);
5026 }
5027
5028 /// Retrieve the number of template arguments.
5029 unsigned getNumArgs() const {
5030 return TemplateSpecializationTypeBits.NumArgs;
5031 }
5032
5033 /// Retrieve a specific template argument as a type.
5034 /// \pre \c isArgType(Arg)
5035 const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h
5036
5037 ArrayRef<TemplateArgument> template_arguments() const {
5038 return {getArgs(), getNumArgs()};
5039 }
5040
5041 bool isSugared() const {
5042 return !isDependentType() || isCurrentInstantiation() || isTypeAlias();
5043 }
5044
5045 QualType desugar() const {
5046 return isTypeAlias() ? getAliasedType() : getCanonicalTypeInternal();
5047 }
5048
5049 void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Ctx) {
5050 Profile(ID, Template, template_arguments(), Ctx);
5051 if (isTypeAlias())
5052 getAliasedType().Profile(ID);
5053 }
5054
5055 static void Profile(llvm::FoldingSetNodeID &ID, TemplateName T,
5056 ArrayRef<TemplateArgument> Args,
5057 const ASTContext &Context);
5058
5059 static bool classof(const Type *T) {
5060 return T->getTypeClass() == TemplateSpecialization;
5061 }
5062};
5063
5064/// Print a template argument list, including the '<' and '>'
5065/// enclosing the template arguments.
5066void printTemplateArgumentList(raw_ostream &OS,
5067 ArrayRef<TemplateArgument> Args,
5068 const PrintingPolicy &Policy);
5069
5070void printTemplateArgumentList(raw_ostream &OS,
5071 ArrayRef<TemplateArgumentLoc> Args,
5072 const PrintingPolicy &Policy);
5073
5074void printTemplateArgumentList(raw_ostream &OS,
5075 const TemplateArgumentListInfo &Args,
5076 const PrintingPolicy &Policy);
5077
5078/// The injected class name of a C++ class template or class
5079/// template partial specialization. Used to record that a type was
5080/// spelled with a bare identifier rather than as a template-id; the
5081/// equivalent for non-templated classes is just RecordType.
5082///
5083/// Injected class name types are always dependent. Template
5084/// instantiation turns these into RecordTypes.
5085///
5086/// Injected class name types are always canonical. This works
5087/// because it is impossible to compare an injected class name type
5088/// with the corresponding non-injected template type, for the same
5089/// reason that it is impossible to directly compare template
5090/// parameters from different dependent contexts: injected class name
5091/// types can only occur within the scope of a particular templated
5092/// declaration, and within that scope every template specialization
5093/// will canonicalize to the injected class name (when appropriate
5094/// according to the rules of the language).
5095class InjectedClassNameType : public Type {
5096 friend class ASTContext; // ASTContext creates these.
5097 friend class ASTNodeImporter;
5098 friend class ASTReader; // FIXME: ASTContext::getInjectedClassNameType is not
5099 // currently suitable for AST reading, too much
5100 // interdependencies.
5101 template <class T> friend class serialization::AbstractTypeReader;
5102
5103 CXXRecordDecl *Decl;
5104
5105 /// The template specialization which this type represents.
5106 /// For example, in
5107 /// template <class T> class A { ... };
5108 /// this is A<T>, whereas in
5109 /// template <class X, class Y> class A<B<X,Y> > { ... };
5110 /// this is A<B<X,Y> >.
5111 ///
5112 /// It is always unqualified, always a template specialization type,
5113 /// and always dependent.
5114 QualType InjectedType;
5115
5116 InjectedClassNameType(CXXRecordDecl *D, QualType TST)
5117 : Type(InjectedClassName, QualType(), /*Dependent=*/true,
5118 /*InstantiationDependent=*/true,
5119 /*VariablyModified=*/false,
5120 /*ContainsUnexpandedParameterPack=*/false),
5121 Decl(D), InjectedType(TST) {
5122 assert(isa<TemplateSpecializationType>(TST))((isa<TemplateSpecializationType>(TST)) ? static_cast<
void> (0) : __assert_fail ("isa<TemplateSpecializationType>(TST)"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 5122, __PRETTY_FUNCTION__))
;
5123 assert(!TST.hasQualifiers())((!TST.hasQualifiers()) ? static_cast<void> (0) : __assert_fail
("!TST.hasQualifiers()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 5123, __PRETTY_FUNCTION__))
;
5124 assert(TST->isDependentType())((TST->isDependentType()) ? static_cast<void> (0) : __assert_fail
("TST->isDependentType()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 5124, __PRETTY_FUNCTION__))
;
5125 }
5126
5127public:
5128 QualType getInjectedSpecializationType() const { return InjectedType; }
5129
5130 const TemplateSpecializationType *getInjectedTST() const {
5131 return cast<TemplateSpecializationType>(InjectedType.getTypePtr());
5132 }
5133
5134 TemplateName getTemplateName() const {
5135 return getInjectedTST()->getTemplateName();
5136 }
5137
5138 CXXRecordDecl *getDecl() const;
5139
5140 bool isSugared() const { return false; }
5141 QualType desugar() const { return QualType(this, 0); }
5142
5143 static bool classof(const Type *T) {
5144 return T->getTypeClass() == InjectedClassName;
5145 }
5146};
5147
5148/// The kind of a tag type.
5149enum TagTypeKind {
5150 /// The "struct" keyword.
5151 TTK_Struct,
5152
5153 /// The "__interface" keyword.
5154 TTK_Interface,
5155
5156 /// The "union" keyword.
5157 TTK_Union,
5158
5159 /// The "class" keyword.
5160 TTK_Class,
5161
5162 /// The "enum" keyword.
5163 TTK_Enum
5164};
5165
5166/// The elaboration keyword that precedes a qualified type name or
5167/// introduces an elaborated-type-specifier.
5168enum ElaboratedTypeKeyword {
5169 /// The "struct" keyword introduces the elaborated-type-specifier.
5170 ETK_Struct,
5171
5172 /// The "__interface" keyword introduces the elaborated-type-specifier.
5173 ETK_Interface,
5174
5175 /// The "union" keyword introduces the elaborated-type-specifier.
5176 ETK_Union,
5177
5178 /// The "class" keyword introduces the elaborated-type-specifier.
5179 ETK_Class,
5180
5181 /// The "enum" keyword introduces the elaborated-type-specifier.
5182 ETK_Enum,
5183
5184 /// The "typename" keyword precedes the qualified type name, e.g.,
5185 /// \c typename T::type.
5186 ETK_Typename,
5187
5188 /// No keyword precedes the qualified type name.
5189 ETK_None
5190};
5191
5192/// A helper class for Type nodes having an ElaboratedTypeKeyword.
5193/// The keyword in stored in the free bits of the base class.
5194/// Also provides a few static helpers for converting and printing
5195/// elaborated type keyword and tag type kind enumerations.
5196class TypeWithKeyword : public Type {
5197protected:
5198 TypeWithKeyword(ElaboratedTypeKeyword Keyword, TypeClass tc,
5199 QualType Canonical, bool Dependent,
5200 bool InstantiationDependent, bool VariablyModified,
5201 bool ContainsUnexpandedParameterPack)
5202 : Type(tc, Canonical, Dependent, InstantiationDependent, VariablyModified,
5203 ContainsUnexpandedParameterPack) {
5204 TypeWithKeywordBits.Keyword = Keyword;
5205 }
5206
5207public:
5208 ElaboratedTypeKeyword getKeyword() const {
5209 return static_cast<ElaboratedTypeKeyword>(TypeWithKeywordBits.Keyword);
5210 }
5211
5212 /// Converts a type specifier (DeclSpec::TST) into an elaborated type keyword.
5213 static ElaboratedTypeKeyword getKeywordForTypeSpec(unsigned TypeSpec);
5214
5215 /// Converts a type specifier (DeclSpec::TST) into a tag type kind.
5216 /// It is an error to provide a type specifier which *isn't* a tag kind here.
5217 static TagTypeKind getTagTypeKindForTypeSpec(unsigned TypeSpec);
5218
5219 /// Converts a TagTypeKind into an elaborated type keyword.
5220 static ElaboratedTypeKeyword getKeywordForTagTypeKind(TagTypeKind Tag);
5221
5222 /// Converts an elaborated type keyword into a TagTypeKind.
5223 /// It is an error to provide an elaborated type keyword
5224 /// which *isn't* a tag kind here.
5225 static TagTypeKind getTagTypeKindForKeyword(ElaboratedTypeKeyword Keyword);
5226
5227 static bool KeywordIsTagTypeKind(ElaboratedTypeKeyword Keyword);
5228
5229 static StringRef getKeywordName(ElaboratedTypeKeyword Keyword);
5230
5231 static StringRef getTagTypeKindName(TagTypeKind Kind) {
5232 return getKeywordName(getKeywordForTagTypeKind(Kind));
5233 }
5234
5235 class CannotCastToThisType {};
5236 static CannotCastToThisType classof(const Type *);
5237};
5238
5239/// Represents a type that was referred to using an elaborated type
5240/// keyword, e.g., struct S, or via a qualified name, e.g., N::M::type,
5241/// or both.
5242///
5243/// This type is used to keep track of a type name as written in the
5244/// source code, including tag keywords and any nested-name-specifiers.
5245/// The type itself is always "sugar", used to express what was written
5246/// in the source code but containing no additional semantic information.
5247class ElaboratedType final
5248 : public TypeWithKeyword,
5249 public llvm::FoldingSetNode,
5250 private llvm::TrailingObjects<ElaboratedType, TagDecl *> {
5251 friend class ASTContext; // ASTContext creates these
5252 friend TrailingObjects;
5253
5254 /// The nested name specifier containing the qualifier.
5255 NestedNameSpecifier *NNS;
5256
5257 /// The type that this qualified name refers to.
5258 QualType NamedType;
5259
5260 /// The (re)declaration of this tag type owned by this occurrence is stored
5261 /// as a trailing object if there is one. Use getOwnedTagDecl to obtain
5262 /// it, or obtain a null pointer if there is none.
5263
5264 ElaboratedType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS,
5265 QualType NamedType, QualType CanonType, TagDecl *OwnedTagDecl)
5266 : TypeWithKeyword(Keyword, Elaborated, CanonType,
5267 NamedType->isDependentType(),
5268 NamedType->isInstantiationDependentType(),
5269 NamedType->isVariablyModifiedType(),
5270 NamedType->containsUnexpandedParameterPack()),
5271 NNS(NNS), NamedType(NamedType) {
5272 ElaboratedTypeBits.HasOwnedTagDecl = false;
5273 if (OwnedTagDecl) {
5274 ElaboratedTypeBits.HasOwnedTagDecl = true;
5275 *getTrailingObjects<TagDecl *>() = OwnedTagDecl;
5276 }
5277 assert(!(Keyword == ETK_None && NNS == nullptr) &&((!(Keyword == ETK_None && NNS == nullptr) &&
"ElaboratedType cannot have elaborated type keyword " "and name qualifier both null."
) ? static_cast<void> (0) : __assert_fail ("!(Keyword == ETK_None && NNS == nullptr) && \"ElaboratedType cannot have elaborated type keyword \" \"and name qualifier both null.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 5279, __PRETTY_FUNCTION__))
5278 "ElaboratedType cannot have elaborated type keyword "((!(Keyword == ETK_None && NNS == nullptr) &&
"ElaboratedType cannot have elaborated type keyword " "and name qualifier both null."
) ? static_cast<void> (0) : __assert_fail ("!(Keyword == ETK_None && NNS == nullptr) && \"ElaboratedType cannot have elaborated type keyword \" \"and name qualifier both null.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 5279, __PRETTY_FUNCTION__))
5279 "and name qualifier both null.")((!(Keyword == ETK_None && NNS == nullptr) &&
"ElaboratedType cannot have elaborated type keyword " "and name qualifier both null."
) ? static_cast<void> (0) : __assert_fail ("!(Keyword == ETK_None && NNS == nullptr) && \"ElaboratedType cannot have elaborated type keyword \" \"and name qualifier both null.\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 5279, __PRETTY_FUNCTION__))
;
5280 }
5281
5282public:
5283 /// Retrieve the qualification on this type.
5284 NestedNameSpecifier *getQualifier() const { return NNS; }
5285
5286 /// Retrieve the type named by the qualified-id.
5287 QualType getNamedType() const { return NamedType; }
5288
5289 /// Remove a single level of sugar.
5290 QualType desugar() const { return getNamedType(); }
5291
5292 /// Returns whether this type directly provides sugar.
5293 bool isSugared() const { return true; }
5294
5295 /// Return the (re)declaration of this type owned by this occurrence of this
5296 /// type, or nullptr if there is none.
5297 TagDecl *getOwnedTagDecl() const {
5298 return ElaboratedTypeBits.HasOwnedTagDecl ? *getTrailingObjects<TagDecl *>()
5299 : nullptr;
5300 }
5301
5302 void Profile(llvm::FoldingSetNodeID &ID) {
5303 Profile(ID, getKeyword(), NNS, NamedType, getOwnedTagDecl());
5304 }
5305
5306 static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword,
5307 NestedNameSpecifier *NNS, QualType NamedType,
5308 TagDecl *OwnedTagDecl) {
5309 ID.AddInteger(Keyword);
5310 ID.AddPointer(NNS);
5311 NamedType.Profile(ID);
5312 ID.AddPointer(OwnedTagDecl);
5313 }
5314
5315 static bool classof(const Type *T) { return T->getTypeClass() == Elaborated; }
5316};
5317
5318/// Represents a qualified type name for which the type name is
5319/// dependent.
5320///
5321/// DependentNameType represents a class of dependent types that involve a
5322/// possibly dependent nested-name-specifier (e.g., "T::") followed by a
5323/// name of a type. The DependentNameType may start with a "typename" (for a
5324/// typename-specifier), "class", "struct", "union", or "enum" (for a
5325/// dependent elaborated-type-specifier), or nothing (in contexts where we
5326/// know that we must be referring to a type, e.g., in a base class specifier).
5327/// Typically the nested-name-specifier is dependent, but in MSVC compatibility
5328/// mode, this type is used with non-dependent names to delay name lookup until
5329/// instantiation.
5330class DependentNameType : public TypeWithKeyword, public llvm::FoldingSetNode {
5331 friend class ASTContext; // ASTContext creates these
5332
5333 /// The nested name specifier containing the qualifier.
5334 NestedNameSpecifier *NNS;
5335
5336 /// The type that this typename specifier refers to.
5337 const IdentifierInfo *Name;
5338
5339 DependentNameType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS,
5340 const IdentifierInfo *Name, QualType CanonType)
5341 : TypeWithKeyword(Keyword, DependentName, CanonType, /*Dependent=*/true,
5342 /*InstantiationDependent=*/true,
5343 /*VariablyModified=*/false,
5344 NNS->containsUnexpandedParameterPack()),
5345 NNS(NNS), Name(Name) {}
5346
5347public:
5348 /// Retrieve the qualification on this type.
5349 NestedNameSpecifier *getQualifier() const { return NNS; }
5350
5351 /// Retrieve the type named by the typename specifier as an identifier.
5352 ///
5353 /// This routine will return a non-NULL identifier pointer when the
5354 /// form of the original typename was terminated by an identifier,
5355 /// e.g., "typename T::type".
5356 const IdentifierInfo *getIdentifier() const {
5357 return Name;
5358 }
5359
5360 bool isSugared() const { return false; }
5361 QualType desugar() const { return QualType(this, 0); }
5362
5363 void Profile(llvm::FoldingSetNodeID &ID) {
5364 Profile(ID, getKeyword(), NNS, Name);
5365 }
5366
5367 static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword,
5368 NestedNameSpecifier *NNS, const IdentifierInfo *Name) {
5369 ID.AddInteger(Keyword);
5370 ID.AddPointer(NNS);
5371 ID.AddPointer(Name);
5372 }
5373
5374 static bool classof(const Type *T) {
5375 return T->getTypeClass() == DependentName;
5376 }
5377};
5378
5379/// Represents a template specialization type whose template cannot be
5380/// resolved, e.g.
5381/// A<T>::template B<T>
5382class alignas(8) DependentTemplateSpecializationType
5383 : public TypeWithKeyword,
5384 public llvm::FoldingSetNode {
5385 friend class ASTContext; // ASTContext creates these
5386
5387 /// The nested name specifier containing the qualifier.
5388 NestedNameSpecifier *NNS;
5389
5390 /// The identifier of the template.
5391 const IdentifierInfo *Name;
5392
5393 DependentTemplateSpecializationType(ElaboratedTypeKeyword Keyword,
5394 NestedNameSpecifier *NNS,
5395 const IdentifierInfo *Name,
5396 ArrayRef<TemplateArgument> Args,
5397 QualType Canon);
5398
5399 const TemplateArgument *getArgBuffer() const {
5400 return reinterpret_cast<const TemplateArgument*>(this+1);
5401 }
5402
5403 TemplateArgument *getArgBuffer() {
5404 return reinterpret_cast<TemplateArgument*>(this+1);
5405 }
5406
5407public:
5408 NestedNameSpecifier *getQualifier() const { return NNS; }
5409 const IdentifierInfo *getIdentifier() const { return Name; }
5410
5411 /// Retrieve the template arguments.
5412 const TemplateArgument *getArgs() const {
5413 return getArgBuffer();
5414 }
5415
5416 /// Retrieve the number of template arguments.
5417 unsigned getNumArgs() const {
5418 return DependentTemplateSpecializationTypeBits.NumArgs;
5419 }
5420
5421 const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h
5422
5423 ArrayRef<TemplateArgument> template_arguments() const {
5424 return {getArgs(), getNumArgs()};
5425 }
5426
5427 using iterator = const TemplateArgument *;
5428
5429 iterator begin() const { return getArgs(); }
5430 iterator end() const; // inline in TemplateBase.h
5431
5432 bool isSugared() const { return false; }
5433 QualType desugar() const { return QualType(this, 0); }
5434
5435 void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context) {
5436 Profile(ID, Context, getKeyword(), NNS, Name, {getArgs(), getNumArgs()});
5437 }
5438
5439 static void Profile(llvm::FoldingSetNodeID &ID,
5440 const ASTContext &Context,
5441 ElaboratedTypeKeyword Keyword,
5442 NestedNameSpecifier *Qualifier,
5443 const IdentifierInfo *Name,
5444 ArrayRef<TemplateArgument> Args);
5445
5446 static bool classof(const Type *T) {
5447 return T->getTypeClass() == DependentTemplateSpecialization;
5448 }
5449};
5450
5451/// Represents a pack expansion of types.
5452///
5453/// Pack expansions are part of C++11 variadic templates. A pack
5454/// expansion contains a pattern, which itself contains one or more
5455/// "unexpanded" parameter packs. When instantiated, a pack expansion
5456/// produces a series of types, each instantiated from the pattern of
5457/// the expansion, where the Ith instantiation of the pattern uses the
5458/// Ith arguments bound to each of the unexpanded parameter packs. The
5459/// pack expansion is considered to "expand" these unexpanded
5460/// parameter packs.
5461///
5462/// \code
5463/// template<typename ...Types> struct tuple;
5464///
5465/// template<typename ...Types>
5466/// struct tuple_of_references {
5467/// typedef tuple<Types&...> type;
5468/// };
5469/// \endcode
5470///
5471/// Here, the pack expansion \c Types&... is represented via a
5472/// PackExpansionType whose pattern is Types&.
5473class PackExpansionType : public Type, public llvm::FoldingSetNode {
5474 friend class ASTContext; // ASTContext creates these
5475
5476 /// The pattern of the pack expansion.
5477 QualType Pattern;
5478
5479 PackExpansionType(QualType Pattern, QualType Canon,
5480 Optional<unsigned> NumExpansions)
5481 : Type(PackExpansion, Canon, /*Dependent=*/Pattern->isDependentType(),
5482 /*InstantiationDependent=*/true,
5483 /*VariablyModified=*/Pattern->isVariablyModifiedType(),
5484 /*ContainsUnexpandedParameterPack=*/false),
5485 Pattern(Pattern) {
5486 PackExpansionTypeBits.NumExpansions =
5487 NumExpansions ? *NumExpansions + 1 : 0;
5488 }
5489
5490public:
5491 /// Retrieve the pattern of this pack expansion, which is the
5492 /// type that will be repeatedly instantiated when instantiating the
5493 /// pack expansion itself.
5494 QualType getPattern() const { return Pattern; }
5495
5496 /// Retrieve the number of expansions that this pack expansion will
5497 /// generate, if known.
5498 Optional<unsigned> getNumExpansions() const {
5499 if (PackExpansionTypeBits.NumExpansions)
5500 return PackExpansionTypeBits.NumExpansions - 1;
5501 return None;
5502 }
5503
5504 bool isSugared() const { return !Pattern->isDependentType(); }
5505 QualType desugar() const { return isSugared() ? Pattern : QualType(this, 0); }
5506
5507 void Profile(llvm::FoldingSetNodeID &ID) {
5508 Profile(ID, getPattern(), getNumExpansions());
5509 }
5510
5511 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pattern,
5512 Optional<unsigned> NumExpansions) {
5513 ID.AddPointer(Pattern.getAsOpaquePtr());
5514 ID.AddBoolean(NumExpansions.hasValue());
5515 if (NumExpansions)
5516 ID.AddInteger(*NumExpansions);
5517 }
5518
5519 static bool classof(const Type *T) {
5520 return T->getTypeClass() == PackExpansion;
5521 }
5522};
5523
5524/// This class wraps the list of protocol qualifiers. For types that can
5525/// take ObjC protocol qualifers, they can subclass this class.
5526template <class T>
5527class ObjCProtocolQualifiers {
5528protected:
5529 ObjCProtocolQualifiers() = default;
5530
5531 ObjCProtocolDecl * const *getProtocolStorage() const {
5532 return const_cast<ObjCProtocolQualifiers*>(this)->getProtocolStorage();
5533 }
5534
5535 ObjCProtocolDecl **getProtocolStorage() {
5536 return static_cast<T*>(this)->getProtocolStorageImpl();
5537 }
5538
5539 void setNumProtocols(unsigned N) {
5540 static_cast<T*>(this)->setNumProtocolsImpl(N);
5541 }
5542
5543 void initialize(ArrayRef<ObjCProtocolDecl *> protocols) {
5544 setNumProtocols(protocols.size());
5545 assert(getNumProtocols() == protocols.size() &&((getNumProtocols() == protocols.size() && "bitfield overflow in protocol count"
) ? static_cast<void> (0) : __assert_fail ("getNumProtocols() == protocols.size() && \"bitfield overflow in protocol count\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 5546, __PRETTY_FUNCTION__))
5546 "bitfield overflow in protocol count")((getNumProtocols() == protocols.size() && "bitfield overflow in protocol count"
) ? static_cast<void> (0) : __assert_fail ("getNumProtocols() == protocols.size() && \"bitfield overflow in protocol count\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 5546, __PRETTY_FUNCTION__))
;
5547 if (!protocols.empty())
5548 memcpy(getProtocolStorage(), protocols.data(),
5549 protocols.size() * sizeof(ObjCProtocolDecl*));
5550 }
5551
5552public:
5553 using qual_iterator = ObjCProtocolDecl * const *;
5554 using qual_range = llvm::iterator_range<qual_iterator>;
5555
5556 qual_range quals() const { return qual_range(qual_begin(), qual_end()); }
5557 qual_iterator qual_begin() const { return getProtocolStorage(); }
5558 qual_iterator qual_end() const { return qual_begin() + getNumProtocols(); }
5559
5560 bool qual_empty() const { return getNumProtocols() == 0; }
5561
5562 /// Return the number of qualifying protocols in this type, or 0 if
5563 /// there are none.
5564 unsigned getNumProtocols() const {
5565 return static_cast<const T*>(this)->getNumProtocolsImpl();
5566 }
5567
5568 /// Fetch a protocol by index.
5569 ObjCProtocolDecl *getProtocol(unsigned I) const {
5570 assert(I < getNumProtocols() && "Out-of-range protocol access")((I < getNumProtocols() && "Out-of-range protocol access"
) ? static_cast<void> (0) : __assert_fail ("I < getNumProtocols() && \"Out-of-range protocol access\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 5570, __PRETTY_FUNCTION__))
;
5571 return qual_begin()[I];
5572 }
5573
5574 /// Retrieve all of the protocol qualifiers.
5575 ArrayRef<ObjCProtocolDecl *> getProtocols() const {
5576 return ArrayRef<ObjCProtocolDecl *>(qual_begin(), getNumProtocols());
5577 }
5578};
5579
5580/// Represents a type parameter type in Objective C. It can take
5581/// a list of protocols.
5582class ObjCTypeParamType : public Type,
5583 public ObjCProtocolQualifiers<ObjCTypeParamType>,
5584 public llvm::FoldingSetNode {
5585 friend class ASTContext;
5586 friend class ObjCProtocolQualifiers<ObjCTypeParamType>;
5587
5588 /// The number of protocols stored on this type.
5589 unsigned NumProtocols : 6;
5590
5591 ObjCTypeParamDecl *OTPDecl;
5592
5593 /// The protocols are stored after the ObjCTypeParamType node. In the
5594 /// canonical type, the list of protocols are sorted alphabetically
5595 /// and uniqued.
5596 ObjCProtocolDecl **getProtocolStorageImpl();
5597
5598 /// Return the number of qualifying protocols in this interface type,
5599 /// or 0 if there are none.
5600 unsigned getNumProtocolsImpl() const {
5601 return NumProtocols;
5602 }
5603
5604 void setNumProtocolsImpl(unsigned N) {
5605 NumProtocols = N;
5606 }
5607
5608 ObjCTypeParamType(const ObjCTypeParamDecl *D,
5609 QualType can,
5610 ArrayRef<ObjCProtocolDecl *> protocols);
5611
5612public:
5613 bool isSugared() const { return true; }
5614 QualType desugar() const { return getCanonicalTypeInternal(); }
5615
5616 static bool classof(const Type *T) {
5617 return T->getTypeClass() == ObjCTypeParam;
5618 }
5619
5620 void Profile(llvm::FoldingSetNodeID &ID);
5621 static void Profile(llvm::FoldingSetNodeID &ID,
5622 const ObjCTypeParamDecl *OTPDecl,
5623 ArrayRef<ObjCProtocolDecl *> protocols);
5624
5625 ObjCTypeParamDecl *getDecl() const { return OTPDecl; }
5626};
5627
5628/// Represents a class type in Objective C.
5629///
5630/// Every Objective C type is a combination of a base type, a set of
5631/// type arguments (optional, for parameterized classes) and a list of
5632/// protocols.
5633///
5634/// Given the following declarations:
5635/// \code
5636/// \@class C<T>;
5637/// \@protocol P;
5638/// \endcode
5639///
5640/// 'C' is an ObjCInterfaceType C. It is sugar for an ObjCObjectType
5641/// with base C and no protocols.
5642///
5643/// 'C<P>' is an unspecialized ObjCObjectType with base C and protocol list [P].
5644/// 'C<C*>' is a specialized ObjCObjectType with type arguments 'C*' and no
5645/// protocol list.
5646/// 'C<C*><P>' is a specialized ObjCObjectType with base C, type arguments 'C*',
5647/// and protocol list [P].
5648///
5649/// 'id' is a TypedefType which is sugar for an ObjCObjectPointerType whose
5650/// pointee is an ObjCObjectType with base BuiltinType::ObjCIdType
5651/// and no protocols.
5652///
5653/// 'id<P>' is an ObjCObjectPointerType whose pointee is an ObjCObjectType
5654/// with base BuiltinType::ObjCIdType and protocol list [P]. Eventually
5655/// this should get its own sugar class to better represent the source.
5656class ObjCObjectType : public Type,
5657 public ObjCProtocolQualifiers<ObjCObjectType> {
5658 friend class ObjCProtocolQualifiers<ObjCObjectType>;
5659
5660 // ObjCObjectType.NumTypeArgs - the number of type arguments stored
5661 // after the ObjCObjectPointerType node.
5662 // ObjCObjectType.NumProtocols - the number of protocols stored
5663 // after the type arguments of ObjCObjectPointerType node.
5664 //
5665 // These protocols are those written directly on the type. If
5666 // protocol qualifiers ever become additive, the iterators will need
5667 // to get kindof complicated.
5668 //
5669 // In the canonical object type, these are sorted alphabetically
5670 // and uniqued.
5671
5672 /// Either a BuiltinType or an InterfaceType or sugar for either.
5673 QualType BaseType;
5674
5675 /// Cached superclass type.
5676 mutable llvm::PointerIntPair<const ObjCObjectType *, 1, bool>
5677 CachedSuperClassType;
5678
5679 QualType *getTypeArgStorage();
5680 const QualType *getTypeArgStorage() const {
5681 return const_cast<ObjCObjectType *>(this)->getTypeArgStorage();
5682 }
5683
5684 ObjCProtocolDecl **getProtocolStorageImpl();
5685 /// Return the number of qualifying protocols in this interface type,
5686 /// or 0 if there are none.
5687 unsigned getNumProtocolsImpl() const {
5688 return ObjCObjectTypeBits.NumProtocols;
5689 }
5690 void setNumProtocolsImpl(unsigned N) {
5691 ObjCObjectTypeBits.NumProtocols = N;
5692 }
5693
5694protected:
5695 enum Nonce_ObjCInterface { Nonce_ObjCInterface };
5696
5697 ObjCObjectType(QualType Canonical, QualType Base,
5698 ArrayRef<QualType> typeArgs,
5699 ArrayRef<ObjCProtocolDecl *> protocols,
5700 bool isKindOf);
5701
5702 ObjCObjectType(enum Nonce_ObjCInterface)
5703 : Type(ObjCInterface, QualType(), false, false, false, false),
5704 BaseType(QualType(this_(), 0)) {
5705 ObjCObjectTypeBits.NumProtocols = 0;
5706 ObjCObjectTypeBits.NumTypeArgs = 0;
5707 ObjCObjectTypeBits.IsKindOf = 0;
5708 }
5709
5710 void computeSuperClassTypeSlow() const;
5711
5712public:
5713 /// Gets the base type of this object type. This is always (possibly
5714 /// sugar for) one of:
5715 /// - the 'id' builtin type (as opposed to the 'id' type visible to the
5716 /// user, which is a typedef for an ObjCObjectPointerType)
5717 /// - the 'Class' builtin type (same caveat)
5718 /// - an ObjCObjectType (currently always an ObjCInterfaceType)
5719 QualType getBaseType() const { return BaseType; }
5720
5721 bool isObjCId() const {
5722 return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCId);
5723 }
5724
5725 bool isObjCClass() const {
5726 return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCClass);
5727 }
5728
5729 bool isObjCUnqualifiedId() const { return qual_empty() && isObjCId(); }
5730 bool isObjCUnqualifiedClass() const { return qual_empty() && isObjCClass(); }
5731 bool isObjCUnqualifiedIdOrClass() const {
5732 if (!qual_empty()) return false;
5733 if (const BuiltinType *T = getBaseType()->getAs<BuiltinType>())
5734 return T->getKind() == BuiltinType::ObjCId ||
5735 T->getKind() == BuiltinType::ObjCClass;
5736 return false;
5737 }
5738 bool isObjCQualifiedId() const { return !qual_empty() && isObjCId(); }
5739 bool isObjCQualifiedClass() const { return !qual_empty() && isObjCClass(); }
5740
5741 /// Gets the interface declaration for this object type, if the base type
5742 /// really is an interface.
5743 ObjCInterfaceDecl *getInterface() const;
5744
5745 /// Determine whether this object type is "specialized", meaning
5746 /// that it has type arguments.
5747 bool isSpecialized() const;
5748
5749 /// Determine whether this object type was written with type arguments.
5750 bool isSpecializedAsWritten() const {
5751 return ObjCObjectTypeBits.NumTypeArgs > 0;
5752 }
5753
5754 /// Determine whether this object type is "unspecialized", meaning
5755 /// that it has no type arguments.
5756 bool isUnspecialized() const { return !isSpecialized(); }
5757
5758 /// Determine whether this object type is "unspecialized" as
5759 /// written, meaning that it has no type arguments.
5760 bool isUnspecializedAsWritten() const { return !isSpecializedAsWritten(); }
5761
5762 /// Retrieve the type arguments of this object type (semantically).
5763 ArrayRef<QualType> getTypeArgs() const;
5764
5765 /// Retrieve the type arguments of this object type as they were
5766 /// written.
5767 ArrayRef<QualType> getTypeArgsAsWritten() const {
5768 return llvm::makeArrayRef(getTypeArgStorage(),
5769 ObjCObjectTypeBits.NumTypeArgs);
5770 }
5771
5772 /// Whether this is a "__kindof" type as written.
5773 bool isKindOfTypeAsWritten() const { return ObjCObjectTypeBits.IsKindOf; }
5774
5775 /// Whether this ia a "__kindof" type (semantically).
5776 bool isKindOfType() const;
5777
5778 /// Retrieve the type of the superclass of this object type.
5779 ///
5780 /// This operation substitutes any type arguments into the
5781 /// superclass of the current class type, potentially producing a
5782 /// specialization of the superclass type. Produces a null type if
5783 /// there is no superclass.
5784 QualType getSuperClassType() const {
5785 if (!CachedSuperClassType.getInt())
5786 computeSuperClassTypeSlow();
5787
5788 assert(CachedSuperClassType.getInt() && "Superclass not set?")((CachedSuperClassType.getInt() && "Superclass not set?"
) ? static_cast<void> (0) : __assert_fail ("CachedSuperClassType.getInt() && \"Superclass not set?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 5788, __PRETTY_FUNCTION__))
;
5789 return QualType(CachedSuperClassType.getPointer(), 0);
5790 }
5791
5792 /// Strip off the Objective-C "kindof" type and (with it) any
5793 /// protocol qualifiers.
5794 QualType stripObjCKindOfTypeAndQuals(const ASTContext &ctx) const;
5795
5796 bool isSugared() const { return false; }
5797 QualType desugar() const { return QualType(this, 0); }
5798
5799 static bool classof(const Type *T) {
5800 return T->getTypeClass() == ObjCObject ||
5801 T->getTypeClass() == ObjCInterface;
5802 }
5803};
5804
5805/// A class providing a concrete implementation
5806/// of ObjCObjectType, so as to not increase the footprint of
5807/// ObjCInterfaceType. Code outside of ASTContext and the core type
5808/// system should not reference this type.
5809class ObjCObjectTypeImpl : public ObjCObjectType, public llvm::FoldingSetNode {
5810 friend class ASTContext;
5811
5812 // If anyone adds fields here, ObjCObjectType::getProtocolStorage()
5813 // will need to be modified.
5814
5815 ObjCObjectTypeImpl(QualType Canonical, QualType Base,
5816 ArrayRef<QualType> typeArgs,
5817 ArrayRef<ObjCProtocolDecl *> protocols,
5818 bool isKindOf)
5819 : ObjCObjectType(Canonical, Base, typeArgs, protocols, isKindOf) {}
5820
5821public:
5822 void Profile(llvm::FoldingSetNodeID &ID);
5823 static void Profile(llvm::FoldingSetNodeID &ID,
5824 QualType Base,
5825 ArrayRef<QualType> typeArgs,
5826 ArrayRef<ObjCProtocolDecl *> protocols,
5827 bool isKindOf);
5828};
5829
5830inline QualType *ObjCObjectType::getTypeArgStorage() {
5831 return reinterpret_cast<QualType *>(static_cast<ObjCObjectTypeImpl*>(this)+1);
5832}
5833
5834inline ObjCProtocolDecl **ObjCObjectType::getProtocolStorageImpl() {
5835 return reinterpret_cast<ObjCProtocolDecl**>(
5836 getTypeArgStorage() + ObjCObjectTypeBits.NumTypeArgs);
5837}
5838
5839inline ObjCProtocolDecl **ObjCTypeParamType::getProtocolStorageImpl() {
5840 return reinterpret_cast<ObjCProtocolDecl**>(
5841 static_cast<ObjCTypeParamType*>(this)+1);
5842}
5843
5844/// Interfaces are the core concept in Objective-C for object oriented design.
5845/// They basically correspond to C++ classes. There are two kinds of interface
5846/// types: normal interfaces like `NSString`, and qualified interfaces, which
5847/// are qualified with a protocol list like `NSString<NSCopyable, NSAmazing>`.
5848///
5849/// ObjCInterfaceType guarantees the following properties when considered
5850/// as a subtype of its superclass, ObjCObjectType:
5851/// - There are no protocol qualifiers. To reinforce this, code which
5852/// tries to invoke the protocol methods via an ObjCInterfaceType will
5853/// fail to compile.
5854/// - It is its own base type. That is, if T is an ObjCInterfaceType*,
5855/// T->getBaseType() == QualType(T, 0).
5856class ObjCInterfaceType : public ObjCObjectType {
5857 friend class ASTContext; // ASTContext creates these.
5858 friend class ASTReader;
5859 friend class ObjCInterfaceDecl;
5860 template <class T> friend class serialization::AbstractTypeReader;
5861
5862 mutable ObjCInterfaceDecl *Decl;
5863
5864 ObjCInterfaceType(const ObjCInterfaceDecl *D)
5865 : ObjCObjectType(Nonce_ObjCInterface),
5866 Decl(const_cast<ObjCInterfaceDecl*>(D)) {}
5867
5868public:
5869 /// Get the declaration of this interface.
5870 ObjCInterfaceDecl *getDecl() const { return Decl; }
5871
5872 bool isSugared() const { return false; }
5873 QualType desugar() const { return QualType(this, 0); }
5874
5875 static bool classof(const Type *T) {
5876 return T->getTypeClass() == ObjCInterface;
5877 }
5878
5879 // Nonsense to "hide" certain members of ObjCObjectType within this
5880 // class. People asking for protocols on an ObjCInterfaceType are
5881 // not going to get what they want: ObjCInterfaceTypes are
5882 // guaranteed to have no protocols.
5883 enum {
5884 qual_iterator,
5885 qual_begin,
5886 qual_end,
5887 getNumProtocols,
5888 getProtocol
5889 };
5890};
5891
5892inline ObjCInterfaceDecl *ObjCObjectType::getInterface() const {
5893 QualType baseType = getBaseType();
5894 while (const auto *ObjT = baseType->getAs<ObjCObjectType>()) {
5895 if (const auto *T = dyn_cast<ObjCInterfaceType>(ObjT))
5896 return T->getDecl();
5897
5898 baseType = ObjT->getBaseType();
5899 }
5900
5901 return nullptr;
5902}
5903
5904/// Represents a pointer to an Objective C object.
5905///
5906/// These are constructed from pointer declarators when the pointee type is
5907/// an ObjCObjectType (or sugar for one). In addition, the 'id' and 'Class'
5908/// types are typedefs for these, and the protocol-qualified types 'id<P>'
5909/// and 'Class<P>' are translated into these.
5910///
5911/// Pointers to pointers to Objective C objects are still PointerTypes;
5912/// only the first level of pointer gets it own type implementation.
5913class ObjCObjectPointerType : public Type, public llvm::FoldingSetNode {
5914 friend class ASTContext; // ASTContext creates these.
5915
5916 QualType PointeeType;
5917
5918 ObjCObjectPointerType(QualType Canonical, QualType Pointee)
5919 : Type(ObjCObjectPointer, Canonical,
5920 Pointee->isDependentType(),
5921 Pointee->isInstantiationDependentType(),
5922 Pointee->isVariablyModifiedType(),
5923 Pointee->containsUnexpandedParameterPack()),
5924 PointeeType(Pointee) {}
5925
5926public:
5927 /// Gets the type pointed to by this ObjC pointer.
5928 /// The result will always be an ObjCObjectType or sugar thereof.
5929 QualType getPointeeType() const { return PointeeType; }
5930
5931 /// Gets the type pointed to by this ObjC pointer. Always returns non-null.
5932 ///
5933 /// This method is equivalent to getPointeeType() except that
5934 /// it discards any typedefs (or other sugar) between this
5935 /// type and the "outermost" object type. So for:
5936 /// \code
5937 /// \@class A; \@protocol P; \@protocol Q;
5938 /// typedef A<P> AP;
5939 /// typedef A A1;
5940 /// typedef A1<P> A1P;
5941 /// typedef A1P<Q> A1PQ;
5942 /// \endcode
5943 /// For 'A*', getObjectType() will return 'A'.
5944 /// For 'A<P>*', getObjectType() will return 'A<P>'.
5945 /// For 'AP*', getObjectType() will return 'A<P>'.
5946 /// For 'A1*', getObjectType() will return 'A'.
5947 /// For 'A1<P>*', getObjectType() will return 'A1<P>'.
5948 /// For 'A1P*', getObjectType() will return 'A1<P>'.
5949 /// For 'A1PQ*', getObjectType() will return 'A1<Q>', because
5950 /// adding protocols to a protocol-qualified base discards the
5951 /// old qualifiers (for now). But if it didn't, getObjectType()
5952 /// would return 'A1P<Q>' (and we'd have to make iterating over
5953 /// qualifiers more complicated).
5954 const ObjCObjectType *getObjectType() const {
5955 return PointeeType->castAs<ObjCObjectType>();
5956 }
5957
5958 /// If this pointer points to an Objective C
5959 /// \@interface type, gets the type for that interface. Any protocol
5960 /// qualifiers on the interface are ignored.
5961 ///
5962 /// \return null if the base type for this pointer is 'id' or 'Class'
5963 const ObjCInterfaceType *getInterfaceType() const;
5964
5965 /// If this pointer points to an Objective \@interface
5966 /// type, gets the declaration for that interface.
5967 ///
5968 /// \return null if the base type for this pointer is 'id' or 'Class'
5969 ObjCInterfaceDecl *getInterfaceDecl() const {
5970 return getObjectType()->getInterface();
5971 }
5972
5973 /// True if this is equivalent to the 'id' type, i.e. if
5974 /// its object type is the primitive 'id' type with no protocols.
5975 bool isObjCIdType() const {
5976 return getObjectType()->isObjCUnqualifiedId();
5977 }
5978
5979 /// True if this is equivalent to the 'Class' type,
5980 /// i.e. if its object tive is the primitive 'Class' type with no protocols.
5981 bool isObjCClassType() const {
5982 return getObjectType()->isObjCUnqualifiedClass();
5983 }
5984
5985 /// True if this is equivalent to the 'id' or 'Class' type,
5986 bool isObjCIdOrClassType() const {
5987 return getObjectType()->isObjCUnqualifiedIdOrClass();
5988 }
5989
5990 /// True if this is equivalent to 'id<P>' for some non-empty set of
5991 /// protocols.
5992 bool isObjCQualifiedIdType() const {
5993 return getObjectType()->isObjCQualifiedId();
5994 }
5995
5996 /// True if this is equivalent to 'Class<P>' for some non-empty set of
5997 /// protocols.
5998 bool isObjCQualifiedClassType() const {
5999 return getObjectType()->isObjCQualifiedClass();
6000 }
6001
6002 /// Whether this is a "__kindof" type.
6003 bool isKindOfType() const { return getObjectType()->isKindOfType(); }
6004
6005 /// Whether this type is specialized, meaning that it has type arguments.
6006 bool isSpecialized() const { return getObjectType()->isSpecialized(); }
6007
6008 /// Whether this type is specialized, meaning that it has type arguments.
6009 bool isSpecializedAsWritten() const {
6010 return getObjectType()->isSpecializedAsWritten();
6011 }
6012
6013 /// Whether this type is unspecialized, meaning that is has no type arguments.
6014 bool isUnspecialized() const { return getObjectType()->isUnspecialized(); }
6015
6016 /// Determine whether this object type is "unspecialized" as
6017 /// written, meaning that it has no type arguments.
6018 bool isUnspecializedAsWritten() const { return !isSpecializedAsWritten(); }
6019
6020 /// Retrieve the type arguments for this type.
6021 ArrayRef<QualType> getTypeArgs() const {
6022 return getObjectType()->getTypeArgs();
6023 }
6024
6025 /// Retrieve the type arguments for this type.
6026 ArrayRef<QualType> getTypeArgsAsWritten() const {
6027 return getObjectType()->getTypeArgsAsWritten();
6028 }
6029
6030 /// An iterator over the qualifiers on the object type. Provided
6031 /// for convenience. This will always iterate over the full set of
6032 /// protocols on a type, not just those provided directly.
6033 using qual_iterator = ObjCObjectType::qual_iterator;
6034 using qual_range = llvm::iterator_range<qual_iterator>;
6035
6036 qual_range quals() const { return qual_range(qual_begin(), qual_end()); }
6037
6038 qual_iterator qual_begin() const {
6039 return getObjectType()->qual_begin();
6040 }
6041
6042 qual_iterator qual_end() const {
6043 return getObjectType()->qual_end();
6044 }
6045
6046 bool qual_empty() const { return getObjectType()->qual_empty(); }
6047
6048 /// Return the number of qualifying protocols on the object type.
6049 unsigned getNumProtocols() const {
6050 return getObjectType()->getNumProtocols();
6051 }
6052
6053 /// Retrieve a qualifying protocol by index on the object type.
6054 ObjCProtocolDecl *getProtocol(unsigned I) const {
6055 return getObjectType()->getProtocol(I);
6056 }
6057
6058 bool isSugared() const { return false; }
6059 QualType desugar() const { return QualType(this, 0); }
6060
6061 /// Retrieve the type of the superclass of this object pointer type.
6062 ///
6063 /// This operation substitutes any type arguments into the
6064 /// superclass of the current class type, potentially producing a
6065 /// pointer to a specialization of the superclass type. Produces a
6066 /// null type if there is no superclass.
6067 QualType getSuperClassType() const;
6068
6069 /// Strip off the Objective-C "kindof" type and (with it) any
6070 /// protocol qualifiers.
6071 const ObjCObjectPointerType *stripObjCKindOfTypeAndQuals(
6072 const ASTContext &ctx) const;
6073
6074 void Profile(llvm::FoldingSetNodeID &ID) {
6075 Profile(ID, getPointeeType());
6076 }
6077
6078 static void Profile(llvm::FoldingSetNodeID &ID, QualType T) {
6079 ID.AddPointer(T.getAsOpaquePtr());
6080 }
6081
6082 static bool classof(const Type *T) {
6083 return T->getTypeClass() == ObjCObjectPointer;
6084 }
6085};
6086
6087class AtomicType : public Type, public llvm::FoldingSetNode {
6088 friend class ASTContext; // ASTContext creates these.
6089
6090 QualType ValueType;
6091
6092 AtomicType(QualType ValTy, QualType Canonical)
6093 : Type(Atomic, Canonical, ValTy->isDependentType(),
6094 ValTy->isInstantiationDependentType(),
6095 ValTy->isVariablyModifiedType(),
6096 ValTy->containsUnexpandedParameterPack()),
6097 ValueType(ValTy) {}
6098
6099public:
6100 /// Gets the type contained by this atomic type, i.e.
6101 /// the type returned by performing an atomic load of this atomic type.
6102 QualType getValueType() const { return ValueType; }
6103
6104 bool isSugared() const { return false; }
6105 QualType desugar() const { return QualType(this, 0); }
6106
6107 void Profile(llvm::FoldingSetNodeID &ID) {
6108 Profile(ID, getValueType());
6109 }
6110
6111 static void Profile(llvm::FoldingSetNodeID &ID, QualType T) {
6112 ID.AddPointer(T.getAsOpaquePtr());
6113 }
6114
6115 static bool classof(const Type *T) {
6116 return T->getTypeClass() == Atomic;
6117 }
6118};
6119
6120/// PipeType - OpenCL20.
6121class PipeType : public Type, public llvm::FoldingSetNode {
6122 friend class ASTContext; // ASTContext creates these.
6123
6124 QualType ElementType;
6125 bool isRead;
6126
6127 PipeType(QualType elemType, QualType CanonicalPtr, bool isRead)
6128 : Type(Pipe, CanonicalPtr, elemType->isDependentType(),
6129 elemType->isInstantiationDependentType(),
6130 elemType->isVariablyModifiedType(),
6131 elemType->containsUnexpandedParameterPack()),
6132 ElementType(elemType), isRead(isRead) {}
6133
6134public:
6135 QualType getElementType() const { return ElementType; }
6136
6137 bool isSugared() const { return false; }
6138
6139 QualType desugar() const { return QualType(this, 0); }
6140
6141 void Profile(llvm::FoldingSetNodeID &ID) {
6142 Profile(ID, getElementType(), isReadOnly());
6143 }
6144
6145 static void Profile(llvm::FoldingSetNodeID &ID, QualType T, bool isRead) {
6146 ID.AddPointer(T.getAsOpaquePtr());
6147 ID.AddBoolean(isRead);
6148 }
6149
6150 static bool classof(const Type *T) {
6151 return T->getTypeClass() == Pipe;
6152 }
6153
6154 bool isReadOnly() const { return isRead; }
6155};
6156
6157/// A qualifier set is used to build a set of qualifiers.
6158class QualifierCollector : public Qualifiers {
6159public:
6160 QualifierCollector(Qualifiers Qs = Qualifiers()) : Qualifiers(Qs) {}
6161
6162 /// Collect any qualifiers on the given type and return an
6163 /// unqualified type. The qualifiers are assumed to be consistent
6164 /// with those already in the type.
6165 const Type *strip(QualType type) {
6166 addFastQualifiers(type.getLocalFastQualifiers());
6167 if (!type.hasLocalNonFastQualifiers())
6168 return type.getTypePtrUnsafe();
6169
6170 const ExtQuals *extQuals = type.getExtQualsUnsafe();
6171 addConsistentQualifiers(extQuals->getQualifiers());
6172 return extQuals->getBaseType();
6173 }
6174
6175 /// Apply the collected qualifiers to the given type.
6176 QualType apply(const ASTContext &Context, QualType QT) const;
6177
6178 /// Apply the collected qualifiers to the given type.
6179 QualType apply(const ASTContext &Context, const Type* T) const;
6180};
6181
6182/// A container of type source information.
6183///
6184/// A client can read the relevant info using TypeLoc wrappers, e.g:
6185/// @code
6186/// TypeLoc TL = TypeSourceInfo->getTypeLoc();
6187/// TL.getBeginLoc().print(OS, SrcMgr);
6188/// @endcode
6189class alignas(8) TypeSourceInfo {
6190 // Contains a memory block after the class, used for type source information,
6191 // allocated by ASTContext.
6192 friend class ASTContext;
6193
6194 QualType Ty;
6195
6196 TypeSourceInfo(QualType ty) : Ty(ty) {}
6197
6198public:
6199 /// Return the type wrapped by this type source info.
6200 QualType getType() const { return Ty; }
6201
6202 /// Return the TypeLoc wrapper for the type source info.
6203 TypeLoc getTypeLoc() const; // implemented in TypeLoc.h
6204
6205 /// Override the type stored in this TypeSourceInfo. Use with caution!
6206 void overrideType(QualType T) { Ty = T; }
6207};
6208
6209// Inline function definitions.
6210
6211inline SplitQualType SplitQualType::getSingleStepDesugaredType() const {
6212 SplitQualType desugar =
6213 Ty->getLocallyUnqualifiedSingleStepDesugaredType().split();
6214 desugar.Quals.addConsistentQualifiers(Quals);
6215 return desugar;
6216}
6217
6218inline const Type *QualType::getTypePtr() const {
6219 return getCommonPtr()->BaseType;
6220}
6221
6222inline const Type *QualType::getTypePtrOrNull() const {
6223 return (isNull() ? nullptr : getCommonPtr()->BaseType);
6224}
6225
6226inline SplitQualType QualType::split() const {
6227 if (!hasLocalNonFastQualifiers())
6228 return SplitQualType(getTypePtrUnsafe(),
6229 Qualifiers::fromFastMask(getLocalFastQualifiers()));
6230
6231 const ExtQuals *eq = getExtQualsUnsafe();
6232 Qualifiers qs = eq->getQualifiers();
6233 qs.addFastQualifiers(getLocalFastQualifiers());
6234 return SplitQualType(eq->getBaseType(), qs);
6235}
6236
6237inline Qualifiers QualType::getLocalQualifiers() const {
6238 Qualifiers Quals;
6239 if (hasLocalNonFastQualifiers())
6240 Quals = getExtQualsUnsafe()->getQualifiers();
6241 Quals.addFastQualifiers(getLocalFastQualifiers());
6242 return Quals;
6243}
6244
6245inline Qualifiers QualType::getQualifiers() const {
6246 Qualifiers quals = getCommonPtr()->CanonicalType.getLocalQualifiers();
6247 quals.addFastQualifiers(getLocalFastQualifiers());
6248 return quals;
6249}
6250
6251inline unsigned QualType::getCVRQualifiers() const {
6252 unsigned cvr = getCommonPtr()->CanonicalType.getLocalCVRQualifiers();
6253 cvr |= getLocalCVRQualifiers();
6254 return cvr;
6255}
6256
6257inline QualType QualType::getCanonicalType() const {
6258 QualType canon = getCommonPtr()->CanonicalType;
6259 return canon.withFastQualifiers(getLocalFastQualifiers());
6260}
6261
6262inline bool QualType::isCanonical() const {
6263 return getTypePtr()->isCanonicalUnqualified();
6264}
6265
6266inline bool QualType::isCanonicalAsParam() const {
6267 if (!isCanonical()) return false;
6268 if (hasLocalQualifiers()) return false;
6269
6270 const Type *T = getTypePtr();
6271 if (T->isVariablyModifiedType() && T->hasSizedVLAType())
6272 return false;
6273
6274 return !isa<FunctionType>(T) && !isa<ArrayType>(T);
6275}
6276
6277inline bool QualType::isConstQualified() const {
6278 return isLocalConstQualified() ||
6279 getCommonPtr()->CanonicalType.isLocalConstQualified();
6280}
6281
6282inline bool QualType::isRestrictQualified() const {
6283 return isLocalRestrictQualified() ||
6284 getCommonPtr()->CanonicalType.isLocalRestrictQualified();
6285}
6286
6287
6288inline bool QualType::isVolatileQualified() const {
6289 return isLocalVolatileQualified() ||
6290 getCommonPtr()->CanonicalType.isLocalVolatileQualified();
6291}
6292
6293inline bool QualType::hasQualifiers() const {
6294 return hasLocalQualifiers() ||
6295 getCommonPtr()->CanonicalType.hasLocalQualifiers();
6296}
6297
6298inline QualType QualType::getUnqualifiedType() const {
6299 if (!getTypePtr()->getCanonicalTypeInternal().hasLocalQualifiers())
6300 return QualType(getTypePtr(), 0);
6301
6302 return QualType(getSplitUnqualifiedTypeImpl(*this).Ty, 0);
6303}
6304
6305inline SplitQualType QualType::getSplitUnqualifiedType() const {
6306 if (!getTypePtr()->getCanonicalTypeInternal().hasLocalQualifiers())
6307 return split();
6308
6309 return getSplitUnqualifiedTypeImpl(*this);
6310}
6311
6312inline void QualType::removeLocalConst() {
6313 removeLocalFastQualifiers(Qualifiers::Const);
6314}
6315
6316inline void QualType::removeLocalRestrict() {
6317 removeLocalFastQualifiers(Qualifiers::Restrict);
6318}
6319
6320inline void QualType::removeLocalVolatile() {
6321 removeLocalFastQualifiers(Qualifiers::Volatile);
6322}
6323
6324inline void QualType::removeLocalCVRQualifiers(unsigned Mask) {
6325 assert(!(Mask & ~Qualifiers::CVRMask) && "mask has non-CVR bits")((!(Mask & ~Qualifiers::CVRMask) && "mask has non-CVR bits"
) ? static_cast<void> (0) : __assert_fail ("!(Mask & ~Qualifiers::CVRMask) && \"mask has non-CVR bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 6325, __PRETTY_FUNCTION__))
;
6326 static_assert((int)Qualifiers::CVRMask == (int)Qualifiers::FastMask,
6327 "Fast bits differ from CVR bits!");
6328
6329 // Fast path: we don't need to touch the slow qualifiers.
6330 removeLocalFastQualifiers(Mask);
6331}
6332
6333/// Check if this type has any address space qualifier.
6334inline bool QualType::hasAddressSpace() const {
6335 return getQualifiers().hasAddressSpace();
6336}
6337
6338/// Return the address space of this type.
6339inline LangAS QualType::getAddressSpace() const {
6340 return getQualifiers().getAddressSpace();
6341}
6342
6343/// Return the gc attribute of this type.
6344inline Qualifiers::GC QualType::getObjCGCAttr() const {
6345 return getQualifiers().getObjCGCAttr();
6346}
6347
6348inline bool QualType::hasNonTrivialToPrimitiveDefaultInitializeCUnion() const {
6349 if (auto *RD = getTypePtr()->getBaseElementTypeUnsafe()->getAsRecordDecl())
6350 return hasNonTrivialToPrimitiveDefaultInitializeCUnion(RD);
6351 return false;
6352}
6353
6354inline bool QualType::hasNonTrivialToPrimitiveDestructCUnion() const {
6355 if (auto *RD = getTypePtr()->getBaseElementTypeUnsafe()->getAsRecordDecl())
6356 return hasNonTrivialToPrimitiveDestructCUnion(RD);
6357 return false;
6358}
6359
6360inline bool QualType::hasNonTrivialToPrimitiveCopyCUnion() const {
6361 if (auto *RD = getTypePtr()->getBaseElementTypeUnsafe()->getAsRecordDecl())
6362 return hasNonTrivialToPrimitiveCopyCUnion(RD);
6363 return false;
6364}
6365
6366inline FunctionType::ExtInfo getFunctionExtInfo(const Type &t) {
6367 if (const auto *PT = t.getAs<PointerType>()) {
6368 if (const auto *FT = PT->getPointeeType()->getAs<FunctionType>())
6369 return FT->getExtInfo();
6370 } else if (const auto *FT = t.getAs<FunctionType>())
6371 return FT->getExtInfo();
6372
6373 return FunctionType::ExtInfo();
6374}
6375
6376inline FunctionType::ExtInfo getFunctionExtInfo(QualType t) {
6377 return getFunctionExtInfo(*t);
6378}
6379
6380/// Determine whether this type is more
6381/// qualified than the Other type. For example, "const volatile int"
6382/// is more qualified than "const int", "volatile int", and
6383/// "int". However, it is not more qualified than "const volatile
6384/// int".
6385inline bool QualType::isMoreQualifiedThan(QualType other) const {
6386 Qualifiers MyQuals = getQualifiers();
6387 Qualifiers OtherQuals = other.getQualifiers();
6388 return (MyQuals != OtherQuals && MyQuals.compatiblyIncludes(OtherQuals));
6389}
6390
6391/// Determine whether this type is at last
6392/// as qualified as the Other type. For example, "const volatile
6393/// int" is at least as qualified as "const int", "volatile int",
6394/// "int", and "const volatile int".
6395inline bool QualType::isAtLeastAsQualifiedAs(QualType other) const {
6396 Qualifiers OtherQuals = other.getQualifiers();
6397
6398 // Ignore __unaligned qualifier if this type is a void.
6399 if (getUnqualifiedType()->isVoidType())
6400 OtherQuals.removeUnaligned();
6401
6402 return getQualifiers().compatiblyIncludes(OtherQuals);
6403}
6404
6405/// If Type is a reference type (e.g., const
6406/// int&), returns the type that the reference refers to ("const
6407/// int"). Otherwise, returns the type itself. This routine is used
6408/// throughout Sema to implement C++ 5p6:
6409///
6410/// If an expression initially has the type "reference to T" (8.3.2,
6411/// 8.5.3), the type is adjusted to "T" prior to any further
6412/// analysis, the expression designates the object or function
6413/// denoted by the reference, and the expression is an lvalue.
6414inline QualType QualType::getNonReferenceType() const {
6415 if (const auto *RefType = (*this)->getAs<ReferenceType>())
6416 return RefType->getPointeeType();
6417 else
6418 return *this;
6419}
6420
6421inline bool QualType::isCForbiddenLValueType() const {
6422 return ((getTypePtr()->isVoidType() && !hasQualifiers()) ||
6423 getTypePtr()->isFunctionType());
6424}
6425
6426/// Tests whether the type is categorized as a fundamental type.
6427///
6428/// \returns True for types specified in C++0x [basic.fundamental].
6429inline bool Type::isFundamentalType() const {
6430 return isVoidType() ||
6431 isNullPtrType() ||
6432 // FIXME: It's really annoying that we don't have an
6433 // 'isArithmeticType()' which agrees with the standard definition.
6434 (isArithmeticType() && !isEnumeralType());
6435}
6436
6437/// Tests whether the type is categorized as a compound type.
6438///
6439/// \returns True for types specified in C++0x [basic.compound].
6440inline bool Type::isCompoundType() const {
6441 // C++0x [basic.compound]p1:
6442 // Compound types can be constructed in the following ways:
6443 // -- arrays of objects of a given type [...];
6444 return isArrayType() ||
6445 // -- functions, which have parameters of given types [...];
6446 isFunctionType() ||
6447 // -- pointers to void or objects or functions [...];
6448 isPointerType() ||
6449 // -- references to objects or functions of a given type. [...]
6450 isReferenceType() ||
6451 // -- classes containing a sequence of objects of various types, [...];
6452 isRecordType() ||
6453 // -- unions, which are classes capable of containing objects of different
6454 // types at different times;
6455 isUnionType() ||
6456 // -- enumerations, which comprise a set of named constant values. [...];
6457 isEnumeralType() ||
6458 // -- pointers to non-static class members, [...].
6459 isMemberPointerType();
6460}
6461
6462inline bool Type::isFunctionType() const {
6463 return isa<FunctionType>(CanonicalType);
6464}
6465
6466inline bool Type::isPointerType() const {
6467 return isa<PointerType>(CanonicalType);
6468}
6469
6470inline bool Type::isAnyPointerType() const {
6471 return isPointerType() || isObjCObjectPointerType();
6472}
6473
6474inline bool Type::isBlockPointerType() const {
6475 return isa<BlockPointerType>(CanonicalType);
6476}
6477
6478inline bool Type::isReferenceType() const {
6479 return isa<ReferenceType>(CanonicalType);
12
Assuming field 'CanonicalType' is not a 'ReferenceType'
13
Returning zero, which participates in a condition later
6480}
6481
6482inline bool Type::isLValueReferenceType() const {
6483 return isa<LValueReferenceType>(CanonicalType);
6484}
6485
6486inline bool Type::isRValueReferenceType() const {
6487 return isa<RValueReferenceType>(CanonicalType);
6488}
6489
6490inline bool Type::isObjectPointerType() const {
6491 // Note: an "object pointer type" is not the same thing as a pointer to an
6492 // object type; rather, it is a pointer to an object type or a pointer to cv
6493 // void.
6494 if (const auto *T = getAs<PointerType>())
6495 return !T->getPointeeType()->isFunctionType();
6496 else
6497 return false;
6498}
6499
6500inline bool Type::isFunctionPointerType() const {
6501 if (const auto *T = getAs<PointerType>())
6502 return T->getPointeeType()->isFunctionType();
6503 else
6504 return false;
6505}
6506
6507inline bool Type::isFunctionReferenceType() const {
6508 if (const auto *T = getAs<ReferenceType>())
6509 return T->getPointeeType()->isFunctionType();
6510 else
6511 return false;
6512}
6513
6514inline bool Type::isMemberPointerType() const {
6515 return isa<MemberPointerType>(CanonicalType);
6516}
6517
6518inline bool Type::isMemberFunctionPointerType() const {
6519 if (const auto *T = getAs<MemberPointerType>())
6520 return T->isMemberFunctionPointer();
6521 else
6522 return false;
6523}
6524
6525inline bool Type::isMemberDataPointerType() const {
6526 if (const auto *T = getAs<MemberPointerType>())
6527 return T->isMemberDataPointer();
6528 else
6529 return false;
6530}
6531
6532inline bool Type::isArrayType() const {
6533 return isa<ArrayType>(CanonicalType);
6534}
6535
6536inline bool Type::isConstantArrayType() const {
6537 return isa<ConstantArrayType>(CanonicalType);
6538}
6539
6540inline bool Type::isIncompleteArrayType() const {
6541 return isa<IncompleteArrayType>(CanonicalType);
6542}
6543
6544inline bool Type::isVariableArrayType() const {
6545 return isa<VariableArrayType>(CanonicalType);
6546}
6547
6548inline bool Type::isDependentSizedArrayType() const {
6549 return isa<DependentSizedArrayType>(CanonicalType);
6550}
6551
6552inline bool Type::isBuiltinType() const {
6553 return isa<BuiltinType>(CanonicalType);
6554}
6555
6556inline bool Type::isRecordType() const {
6557 return isa<RecordType>(CanonicalType);
32
Assuming field 'CanonicalType' is not a 'RecordType'
33
Returning zero, which participates in a condition later
6558}
6559
6560inline bool Type::isEnumeralType() const {
6561 return isa<EnumType>(CanonicalType);
6562}
6563
6564inline bool Type::isAnyComplexType() const {
6565 return isa<ComplexType>(CanonicalType);
6566}
6567
6568inline bool Type::isVectorType() const {
6569 return isa<VectorType>(CanonicalType);
6570}
6571
6572inline bool Type::isExtVectorType() const {
6573 return isa<ExtVectorType>(CanonicalType);
6574}
6575
6576inline bool Type::isDependentAddressSpaceType() const {
6577 return isa<DependentAddressSpaceType>(CanonicalType);
6578}
6579
6580inline bool Type::isObjCObjectPointerType() const {
6581 return isa<ObjCObjectPointerType>(CanonicalType);
6582}
6583
6584inline bool Type::isObjCObjectType() const {
6585 return isa<ObjCObjectType>(CanonicalType);
6586}
6587
6588inline bool Type::isObjCObjectOrInterfaceType() const {
6589 return isa<ObjCInterfaceType>(CanonicalType) ||
6590 isa<ObjCObjectType>(CanonicalType);
6591}
6592
6593inline bool Type::isAtomicType() const {
6594 return isa<AtomicType>(CanonicalType);
6595}
6596
6597inline bool Type::isUndeducedAutoType() const {
6598 return isa<AutoType>(CanonicalType);
6599}
6600
6601inline bool Type::isObjCQualifiedIdType() const {
6602 if (const auto *OPT = getAs<ObjCObjectPointerType>())
6603 return OPT->isObjCQualifiedIdType();
6604 return false;
6605}
6606
6607inline bool Type::isObjCQualifiedClassType() const {
6608 if (const auto *OPT = getAs<ObjCObjectPointerType>())
6609 return OPT->isObjCQualifiedClassType();
6610 return false;
6611}
6612
6613inline bool Type::isObjCIdType() const {
6614 if (const auto *OPT = getAs<ObjCObjectPointerType>())
6615 return OPT->isObjCIdType();
6616 return false;
6617}
6618
6619inline bool Type::isObjCClassType() const {
6620 if (const auto *OPT = getAs<ObjCObjectPointerType>())
6621 return OPT->isObjCClassType();
6622 return false;
6623}
6624
6625inline bool Type::isObjCSelType() const {
6626 if (const auto *OPT = getAs<PointerType>())
6627 return OPT->getPointeeType()->isSpecificBuiltinType(BuiltinType::ObjCSel);
6628 return false;
6629}
6630
6631inline bool Type::isObjCBuiltinType() const {
6632 return isObjCIdType() || isObjCClassType() || isObjCSelType();
6633}
6634
6635inline bool Type::isDecltypeType() const {
6636 return isa<DecltypeType>(this);
6637}
6638
6639#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
6640 inline bool Type::is##Id##Type() const { \
6641 return isSpecificBuiltinType(BuiltinType::Id); \
6642 }
6643#include "clang/Basic/OpenCLImageTypes.def"
6644
6645inline bool Type::isSamplerT() const {
6646 return isSpecificBuiltinType(BuiltinType::OCLSampler);
6647}
6648
6649inline bool Type::isEventT() const {
6650 return isSpecificBuiltinType(BuiltinType::OCLEvent);
6651}
6652
6653inline bool Type::isClkEventT() const {
6654 return isSpecificBuiltinType(BuiltinType::OCLClkEvent);
6655}
6656
6657inline bool Type::isQueueT() const {
6658 return isSpecificBuiltinType(BuiltinType::OCLQueue);
6659}
6660
6661inline bool Type::isReserveIDT() const {
6662 return isSpecificBuiltinType(BuiltinType::OCLReserveID);
6663}
6664
6665inline bool Type::isImageType() const {
6666#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) is##Id##Type() ||
6667 return
6668#include "clang/Basic/OpenCLImageTypes.def"
6669 false; // end boolean or operation
6670}
6671
6672inline bool Type::isPipeType() const {
6673 return isa<PipeType>(CanonicalType);
6674}
6675
6676#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
6677 inline bool Type::is##Id##Type() const { \
6678 return isSpecificBuiltinType(BuiltinType::Id); \
6679 }
6680#include "clang/Basic/OpenCLExtensionTypes.def"
6681
6682inline bool Type::isOCLIntelSubgroupAVCType() const {
6683#define INTEL_SUBGROUP_AVC_TYPE(ExtType, Id) \
6684 isOCLIntelSubgroupAVC##Id##Type() ||
6685 return
6686#include "clang/Basic/OpenCLExtensionTypes.def"
6687 false; // end of boolean or operation
6688}
6689
6690inline bool Type::isOCLExtOpaqueType() const {
6691#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) is##Id##Type() ||
6692 return
6693#include "clang/Basic/OpenCLExtensionTypes.def"
6694 false; // end of boolean or operation
6695}
6696
6697inline bool Type::isOpenCLSpecificType() const {
6698 return isSamplerT() || isEventT() || isImageType() || isClkEventT() ||
6699 isQueueT() || isReserveIDT() || isPipeType() || isOCLExtOpaqueType();
6700}
6701
6702inline bool Type::isTemplateTypeParmType() const {
6703 return isa<TemplateTypeParmType>(CanonicalType);
6704}
6705
6706inline bool Type::isSpecificBuiltinType(unsigned K) const {
6707 if (const BuiltinType *BT = getAs<BuiltinType>())
6708 if (BT->getKind() == (BuiltinType::Kind) K)
6709 return true;
6710 return false;
6711}
6712
6713inline bool Type::isPlaceholderType() const {
6714 if (const auto *BT = dyn_cast<BuiltinType>(this))
6715 return BT->isPlaceholderType();
6716 return false;
6717}
6718
6719inline const BuiltinType *Type::getAsPlaceholderType() const {
6720 if (const auto *BT = dyn_cast<BuiltinType>(this))
6721 if (BT->isPlaceholderType())
6722 return BT;
6723 return nullptr;
6724}
6725
6726inline bool Type::isSpecificPlaceholderType(unsigned K) const {
6727 assert(BuiltinType::isPlaceholderTypeKind((BuiltinType::Kind) K))((BuiltinType::isPlaceholderTypeKind((BuiltinType::Kind) K)) ?
static_cast<void> (0) : __assert_fail ("BuiltinType::isPlaceholderTypeKind((BuiltinType::Kind) K)"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 6727, __PRETTY_FUNCTION__))
;
6728 if (const auto *BT = dyn_cast<BuiltinType>(this))
6729 return (BT->getKind() == (BuiltinType::Kind) K);
6730 return false;
6731}
6732
6733inline bool Type::isNonOverloadPlaceholderType() const {
6734 if (const auto *BT = dyn_cast<BuiltinType>(this))
6735 return BT->isNonOverloadPlaceholderType();
6736 return false;
6737}
6738
6739inline bool Type::isVoidType() const {
6740 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
6741 return BT->getKind() == BuiltinType::Void;
6742 return false;
6743}
6744
6745inline bool Type::isHalfType() const {
6746 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
6747 return BT->getKind() == BuiltinType::Half;
6748 // FIXME: Should we allow complex __fp16? Probably not.
6749 return false;
6750}
6751
6752inline bool Type::isFloat16Type() const {
6753 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
6754 return BT->getKind() == BuiltinType::Float16;
6755 return false;
6756}
6757
6758inline bool Type::isFloat128Type() const {
6759 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
6760 return BT->getKind() == BuiltinType::Float128;
6761 return false;
6762}
6763
6764inline bool Type::isNullPtrType() const {
6765 if (const auto *BT = getAs<BuiltinType>())
6766 return BT->getKind() == BuiltinType::NullPtr;
6767 return false;
6768}
6769
6770bool IsEnumDeclComplete(EnumDecl *);
6771bool IsEnumDeclScoped(EnumDecl *);
6772
6773inline bool Type::isIntegerType() const {
6774 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
6775 return BT->getKind() >= BuiltinType::Bool &&
6776 BT->getKind() <= BuiltinType::Int128;
6777 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType)) {
6778 // Incomplete enum types are not treated as integer types.
6779 // FIXME: In C++, enum types are never integer types.
6780 return IsEnumDeclComplete(ET->getDecl()) &&
6781 !IsEnumDeclScoped(ET->getDecl());
6782 }
6783 return false;
6784}
6785
6786inline bool Type::isFixedPointType() const {
6787 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType)) {
6788 return BT->getKind() >= BuiltinType::ShortAccum &&
6789 BT->getKind() <= BuiltinType::SatULongFract;
6790 }
6791 return false;
6792}
6793
6794inline bool Type::isFixedPointOrIntegerType() const {
6795 return isFixedPointType() || isIntegerType();
6796}
6797
6798inline bool Type::isSaturatedFixedPointType() const {
6799 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType)) {
6800 return BT->getKind() >= BuiltinType::SatShortAccum &&
6801 BT->getKind() <= BuiltinType::SatULongFract;
6802 }
6803 return false;
6804}
6805
6806inline bool Type::isUnsaturatedFixedPointType() const {
6807 return isFixedPointType() && !isSaturatedFixedPointType();
6808}
6809
6810inline bool Type::isSignedFixedPointType() const {
6811 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType)) {
6812 return ((BT->getKind() >= BuiltinType::ShortAccum &&
6813 BT->getKind() <= BuiltinType::LongAccum) ||
6814 (BT->getKind() >= BuiltinType::ShortFract &&
6815 BT->getKind() <= BuiltinType::LongFract) ||
6816 (BT->getKind() >= BuiltinType::SatShortAccum &&
6817 BT->getKind() <= BuiltinType::SatLongAccum) ||
6818 (BT->getKind() >= BuiltinType::SatShortFract &&
6819 BT->getKind() <= BuiltinType::SatLongFract));
6820 }
6821 return false;
6822}
6823
6824inline bool Type::isUnsignedFixedPointType() const {
6825 return isFixedPointType() && !isSignedFixedPointType();
6826}
6827
6828inline bool Type::isScalarType() const {
6829 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
6830 return BT->getKind() > BuiltinType::Void &&
6831 BT->getKind() <= BuiltinType::NullPtr;
6832 if (const EnumType *ET = dyn_cast<EnumType>(CanonicalType))
6833 // Enums are scalar types, but only if they are defined. Incomplete enums
6834 // are not treated as scalar types.
6835 return IsEnumDeclComplete(ET->getDecl());
6836 return isa<PointerType>(CanonicalType) ||
6837 isa<BlockPointerType>(CanonicalType) ||
6838 isa<MemberPointerType>(CanonicalType) ||
6839 isa<ComplexType>(CanonicalType) ||
6840 isa<ObjCObjectPointerType>(CanonicalType);
6841}
6842
6843inline bool Type::isIntegralOrEnumerationType() const {
6844 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
6845 return BT->getKind() >= BuiltinType::Bool &&
6846 BT->getKind() <= BuiltinType::Int128;
6847
6848 // Check for a complete enum type; incomplete enum types are not properly an
6849 // enumeration type in the sense required here.
6850 if (const auto *ET = dyn_cast<EnumType>(CanonicalType))
6851 return IsEnumDeclComplete(ET->getDecl());
6852
6853 return false;
6854}
6855
6856inline bool Type::isBooleanType() const {
6857 if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
6858 return BT->getKind() == BuiltinType::Bool;
6859 return false;
6860}
6861
6862inline bool Type::isUndeducedType() const {
6863 auto *DT = getContainedDeducedType();
6864 return DT && !DT->isDeduced();
6865}
6866
6867/// Determines whether this is a type for which one can define
6868/// an overloaded operator.
6869inline bool Type::isOverloadableType() const {
6870 return isDependentType() || isRecordType() || isEnumeralType();
6871}
6872
6873/// Determines whether this type can decay to a pointer type.
6874inline bool Type::canDecayToPointerType() const {
6875 return isFunctionType() || isArrayType();
6876}
6877
6878inline bool Type::hasPointerRepresentation() const {
6879 return (isPointerType() || isReferenceType() || isBlockPointerType() ||
6880 isObjCObjectPointerType() || isNullPtrType());
6881}
6882
6883inline bool Type::hasObjCPointerRepresentation() const {
6884 return isObjCObjectPointerType();
6885}
6886
6887inline const Type *Type::getBaseElementTypeUnsafe() const {
6888 const Type *type = this;
6889 while (const ArrayType *arrayType = type->getAsArrayTypeUnsafe())
6890 type = arrayType->getElementType().getTypePtr();
6891 return type;
6892}
6893
6894inline const Type *Type::getPointeeOrArrayElementType() const {
6895 const Type *type = this;
6896 if (type->isAnyPointerType())
6897 return type->getPointeeType().getTypePtr();
6898 else if (type->isArrayType())
6899 return type->getBaseElementTypeUnsafe();
6900 return type;
6901}
6902/// Insertion operator for diagnostics. This allows sending address spaces into
6903/// a diagnostic with <<.
6904inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
6905 LangAS AS) {
6906 DB.AddTaggedVal(static_cast<std::underlying_type_t<LangAS>>(AS),
6907 DiagnosticsEngine::ArgumentKind::ak_addrspace);
6908 return DB;
6909}
6910
6911/// Insertion operator for partial diagnostics. This allows sending adress
6912/// spaces into a diagnostic with <<.
6913inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
6914 LangAS AS) {
6915 PD.AddTaggedVal(static_cast<std::underlying_type_t<LangAS>>(AS),
6916 DiagnosticsEngine::ArgumentKind::ak_addrspace);
6917 return PD;
6918}
6919
6920/// Insertion operator for diagnostics. This allows sending Qualifiers into a
6921/// diagnostic with <<.
6922inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
6923 Qualifiers Q) {
6924 DB.AddTaggedVal(Q.getAsOpaqueValue(),
6925 DiagnosticsEngine::ArgumentKind::ak_qual);
6926 return DB;
6927}
6928
6929/// Insertion operator for partial diagnostics. This allows sending Qualifiers
6930/// into a diagnostic with <<.
6931inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
6932 Qualifiers Q) {
6933 PD.AddTaggedVal(Q.getAsOpaqueValue(),
6934 DiagnosticsEngine::ArgumentKind::ak_qual);
6935 return PD;
6936}
6937
6938/// Insertion operator for diagnostics. This allows sending QualType's into a
6939/// diagnostic with <<.
6940inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
6941 QualType T) {
6942 DB.AddTaggedVal(reinterpret_cast<intptr_t>(T.getAsOpaquePtr()),
6943 DiagnosticsEngine::ak_qualtype);
6944 return DB;
6945}
6946
6947/// Insertion operator for partial diagnostics. This allows sending QualType's
6948/// into a diagnostic with <<.
6949inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
6950 QualType T) {
6951 PD.AddTaggedVal(reinterpret_cast<intptr_t>(T.getAsOpaquePtr()),
6952 DiagnosticsEngine::ak_qualtype);
6953 return PD;
6954}
6955
6956// Helper class template that is used by Type::getAs to ensure that one does
6957// not try to look through a qualified type to get to an array type.
6958template <typename T>
6959using TypeIsArrayType =
6960 std::integral_constant<bool, std::is_same<T, ArrayType>::value ||
6961 std::is_base_of<ArrayType, T>::value>;
6962
6963// Member-template getAs<specific type>'.
6964template <typename T> const T *Type::getAs() const {
6965 static_assert(!TypeIsArrayType<T>::value,
6966 "ArrayType cannot be used with getAs!");
6967
6968 // If this is directly a T type, return it.
6969 if (const auto *Ty = dyn_cast<T>(this))
6970 return Ty;
6971
6972 // If the canonical form of this type isn't the right kind, reject it.
6973 if (!isa<T>(CanonicalType))
6974 return nullptr;
6975
6976 // If this is a typedef for the type, strip the typedef off without
6977 // losing all typedef information.
6978 return cast<T>(getUnqualifiedDesugaredType());
6979}
6980
6981template <typename T> const T *Type::getAsAdjusted() const {
6982 static_assert(!TypeIsArrayType<T>::value, "ArrayType cannot be used with getAsAdjusted!");
6983
6984 // If this is directly a T type, return it.
6985 if (const auto *Ty = dyn_cast<T>(this))
6986 return Ty;
6987
6988 // If the canonical form of this type isn't the right kind, reject it.
6989 if (!isa<T>(CanonicalType))
6990 return nullptr;
6991
6992 // Strip off type adjustments that do not modify the underlying nature of the
6993 // type.
6994 const Type *Ty = this;
6995 while (Ty) {
6996 if (const auto *A = dyn_cast<AttributedType>(Ty))
6997 Ty = A->getModifiedType().getTypePtr();
6998 else if (const auto *E = dyn_cast<ElaboratedType>(Ty))
6999 Ty = E->desugar().getTypePtr();
7000 else if (const auto *P = dyn_cast<ParenType>(Ty))
7001 Ty = P->desugar().getTypePtr();
7002 else if (const auto *A = dyn_cast<AdjustedType>(Ty))
7003 Ty = A->desugar().getTypePtr();
7004 else if (const auto *M = dyn_cast<MacroQualifiedType>(Ty))
7005 Ty = M->desugar().getTypePtr();
7006 else
7007 break;
7008 }
7009
7010 // Just because the canonical type is correct does not mean we can use cast<>,
7011 // since we may not have stripped off all the sugar down to the base type.
7012 return dyn_cast<T>(Ty);
7013}
7014
7015inline const ArrayType *Type::getAsArrayTypeUnsafe() const {
7016 // If this is directly an array type, return it.
7017 if (const auto *arr = dyn_cast<ArrayType>(this))
7018 return arr;
7019
7020 // If the canonical form of this type isn't the right kind, reject it.
7021 if (!isa<ArrayType>(CanonicalType))
7022 return nullptr;
7023
7024 // If this is a typedef for the type, strip the typedef off without
7025 // losing all typedef information.
7026 return cast<ArrayType>(getUnqualifiedDesugaredType());
7027}
7028
7029template <typename T> const T *Type::castAs() const {
7030 static_assert(!TypeIsArrayType<T>::value,
7031 "ArrayType cannot be used with castAs!");
7032
7033 if (const auto *ty = dyn_cast<T>(this)) return ty;
7034 assert(isa<T>(CanonicalType))((isa<T>(CanonicalType)) ? static_cast<void> (0) :
__assert_fail ("isa<T>(CanonicalType)", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 7034, __PRETTY_FUNCTION__))
;
7035 return cast<T>(getUnqualifiedDesugaredType());
7036}
7037
7038inline const ArrayType *Type::castAsArrayTypeUnsafe() const {
7039 assert(isa<ArrayType>(CanonicalType))((isa<ArrayType>(CanonicalType)) ? static_cast<void>
(0) : __assert_fail ("isa<ArrayType>(CanonicalType)", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 7039, __PRETTY_FUNCTION__))
;
7040 if (const auto *arr = dyn_cast<ArrayType>(this)) return arr;
7041 return cast<ArrayType>(getUnqualifiedDesugaredType());
7042}
7043
7044DecayedType::DecayedType(QualType OriginalType, QualType DecayedPtr,
7045 QualType CanonicalPtr)
7046 : AdjustedType(Decayed, OriginalType, DecayedPtr, CanonicalPtr) {
7047#ifndef NDEBUG
7048 QualType Adjusted = getAdjustedType();
7049 (void)AttributedType::stripOuterNullability(Adjusted);
7050 assert(isa<PointerType>(Adjusted))((isa<PointerType>(Adjusted)) ? static_cast<void>
(0) : __assert_fail ("isa<PointerType>(Adjusted)", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/AST/Type.h"
, 7050, __PRETTY_FUNCTION__))
;
7051#endif
7052}
7053
7054QualType DecayedType::getPointeeType() const {
7055 QualType Decayed = getDecayedType();
7056 (void)AttributedType::stripOuterNullability(Decayed);
7057 return cast<PointerType>(Decayed)->getPointeeType();
7058}
7059
7060// Get the decimal string representation of a fixed point type, represented
7061// as a scaled integer.
7062// TODO: At some point, we should change the arguments to instead just accept an
7063// APFixedPoint instead of APSInt and scale.
7064void FixedPointValueToString(SmallVectorImpl<char> &Str, llvm::APSInt Val,
7065 unsigned Scale);
7066
7067} // namespace clang
7068
7069#endif // LLVM_CLANG_AST_TYPE_H

/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerUnion.h

1//===- llvm/ADT/PointerUnion.h - Discriminated Union of 2 Ptrs --*- C++ -*-===//
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 defines the PointerUnion class, which is a discriminated union of
10// pointer types.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_ADT_POINTERUNION_H
15#define LLVM_ADT_POINTERUNION_H
16
17#include "llvm/ADT/DenseMapInfo.h"
18#include "llvm/ADT/PointerIntPair.h"
19#include "llvm/Support/PointerLikeTypeTraits.h"
20#include <cassert>
21#include <cstddef>
22#include <cstdint>
23
24namespace llvm {
25
26template <typename T> struct PointerUnionTypeSelectorReturn {
27 using Return = T;
28};
29
30/// Get a type based on whether two types are the same or not.
31///
32/// For:
33///
34/// \code
35/// using Ret = typename PointerUnionTypeSelector<T1, T2, EQ, NE>::Return;
36/// \endcode
37///
38/// Ret will be EQ type if T1 is same as T2 or NE type otherwise.
39template <typename T1, typename T2, typename RET_EQ, typename RET_NE>
40struct PointerUnionTypeSelector {
41 using Return = typename PointerUnionTypeSelectorReturn<RET_NE>::Return;
42};
43
44template <typename T, typename RET_EQ, typename RET_NE>
45struct PointerUnionTypeSelector<T, T, RET_EQ, RET_NE> {
46 using Return = typename PointerUnionTypeSelectorReturn<RET_EQ>::Return;
47};
48
49template <typename T1, typename T2, typename RET_EQ, typename RET_NE>
50struct PointerUnionTypeSelectorReturn<
51 PointerUnionTypeSelector<T1, T2, RET_EQ, RET_NE>> {
52 using Return =
53 typename PointerUnionTypeSelector<T1, T2, RET_EQ, RET_NE>::Return;
54};
55
56namespace pointer_union_detail {
57 /// Determine the number of bits required to store integers with values < n.
58 /// This is ceil(log2(n)).
59 constexpr int bitsRequired(unsigned n) {
60 return n > 1 ? 1 + bitsRequired((n + 1) / 2) : 0;
61 }
62
63 template <typename... Ts> constexpr int lowBitsAvailable() {
64 return std::min<int>({PointerLikeTypeTraits<Ts>::NumLowBitsAvailable...});
65 }
66
67 /// Find the index of a type in a list of types. TypeIndex<T, Us...>::Index
68 /// is the index of T in Us, or sizeof...(Us) if T does not appear in the
69 /// list.
70 template <typename T, typename ...Us> struct TypeIndex;
71 template <typename T, typename ...Us> struct TypeIndex<T, T, Us...> {
72 static constexpr int Index = 0;
73 };
74 template <typename T, typename U, typename... Us>
75 struct TypeIndex<T, U, Us...> {
76 static constexpr int Index = 1 + TypeIndex<T, Us...>::Index;
77 };
78 template <typename T> struct TypeIndex<T> {
79 static constexpr int Index = 0;
80 };
81
82 /// Find the first type in a list of types.
83 template <typename T, typename...> struct GetFirstType {
84 using type = T;
85 };
86
87 /// Provide PointerLikeTypeTraits for void* that is used by PointerUnion
88 /// for the template arguments.
89 template <typename ...PTs> class PointerUnionUIntTraits {
90 public:
91 static inline void *getAsVoidPointer(void *P) { return P; }
92 static inline void *getFromVoidPointer(void *P) { return P; }
47
Returning null pointer (loaded from 'P'), which participates in a condition later
93 static constexpr int NumLowBitsAvailable = lowBitsAvailable<PTs...>();
94 };
95
96 /// Implement assignment in terms of construction.
97 template <typename Derived, typename T> struct AssignableFrom {
98 Derived &operator=(T t) {
99 return static_cast<Derived &>(*this) = Derived(t);
100 }
101 };
102
103 template <typename Derived, typename ValTy, int I, typename ...Types>
104 class PointerUnionMembers;
105
106 template <typename Derived, typename ValTy, int I>
107 class PointerUnionMembers<Derived, ValTy, I> {
108 protected:
109 ValTy Val;
110 PointerUnionMembers() = default;
111 PointerUnionMembers(ValTy Val) : Val(Val) {}
112
113 friend struct PointerLikeTypeTraits<Derived>;
114 };
115
116 template <typename Derived, typename ValTy, int I, typename Type,
117 typename ...Types>
118 class PointerUnionMembers<Derived, ValTy, I, Type, Types...>
119 : public PointerUnionMembers<Derived, ValTy, I + 1, Types...> {
120 using Base = PointerUnionMembers<Derived, ValTy, I + 1, Types...>;
121 public:
122 using Base::Base;
123 PointerUnionMembers() = default;
124 PointerUnionMembers(Type V)
125 : Base(ValTy(const_cast<void *>(
126 PointerLikeTypeTraits<Type>::getAsVoidPointer(V)),
127 I)) {}
128
129 using Base::operator=;
130 Derived &operator=(Type V) {
131 this->Val = ValTy(
132 const_cast<void *>(PointerLikeTypeTraits<Type>::getAsVoidPointer(V)),
133 I);
134 return static_cast<Derived &>(*this);
135 };
136 };
137}
138
139/// A discriminated union of two or more pointer types, with the discriminator
140/// in the low bit of the pointer.
141///
142/// This implementation is extremely efficient in space due to leveraging the
143/// low bits of the pointer, while exposing a natural and type-safe API.
144///
145/// Common use patterns would be something like this:
146/// PointerUnion<int*, float*> P;
147/// P = (int*)0;
148/// printf("%d %d", P.is<int*>(), P.is<float*>()); // prints "1 0"
149/// X = P.get<int*>(); // ok.
150/// Y = P.get<float*>(); // runtime assertion failure.
151/// Z = P.get<double*>(); // compile time failure.
152/// P = (float*)0;
153/// Y = P.get<float*>(); // ok.
154/// X = P.get<int*>(); // runtime assertion failure.
155template <typename... PTs>
156class PointerUnion
157 : public pointer_union_detail::PointerUnionMembers<
158 PointerUnion<PTs...>,
159 PointerIntPair<
160 void *, pointer_union_detail::bitsRequired(sizeof...(PTs)), int,
161 pointer_union_detail::PointerUnionUIntTraits<PTs...>>,
162 0, PTs...> {
163 // The first type is special because we want to directly cast a pointer to a
164 // default-initialized union to a pointer to the first type. But we don't
165 // want PointerUnion to be a 'template <typename First, typename ...Rest>'
166 // because it's much more convenient to have a name for the whole pack. So
167 // split off the first type here.
168 using First = typename pointer_union_detail::GetFirstType<PTs...>::type;
169 using Base = typename PointerUnion::PointerUnionMembers;
170
171public:
172 PointerUnion() = default;
173
174 PointerUnion(std::nullptr_t) : PointerUnion() {}
175 using Base::Base;
176
177 /// Test if the pointer held in the union is null, regardless of
178 /// which type it is.
179 bool isNull() const { return !this->Val.getPointer(); }
44
Calling 'PointerIntPair::getPointer'
52
Returning from 'PointerIntPair::getPointer'
53
Returning the value 1, which participates in a condition later
180
181 explicit operator bool() const { return !isNull(); }
182
183 /// Test if the Union currently holds the type matching T.
184 template <typename T> int is() const {
185 constexpr int Index = pointer_union_detail::TypeIndex<T, PTs...>::Index;
186 static_assert(Index < sizeof...(PTs),
187 "PointerUnion::is<T> given type not in the union");
188 return this->Val.getInt() == Index;
189 }
190
191 /// Returns the value of the specified pointer type.
192 ///
193 /// If the specified pointer type is incorrect, assert.
194 template <typename T> T get() const {
195 assert(is<T>() && "Invalid accessor called")((is<T>() && "Invalid accessor called") ? static_cast
<void> (0) : __assert_fail ("is<T>() && \"Invalid accessor called\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerUnion.h"
, 195, __PRETTY_FUNCTION__))
;
196 return PointerLikeTypeTraits<T>::getFromVoidPointer(this->Val.getPointer());
197 }
198
199 /// Returns the current pointer if it is of the specified pointer type,
200 /// otherwises returns null.
201 template <typename T> T dyn_cast() const {
202 if (is<T>())
203 return get<T>();
204 return T();
205 }
206
207 /// If the union is set to the first pointer type get an address pointing to
208 /// it.
209 First const *getAddrOfPtr1() const {
210 return const_cast<PointerUnion *>(this)->getAddrOfPtr1();
211 }
212
213 /// If the union is set to the first pointer type get an address pointing to
214 /// it.
215 First *getAddrOfPtr1() {
216 assert(is<First>() && "Val is not the first pointer")((is<First>() && "Val is not the first pointer"
) ? static_cast<void> (0) : __assert_fail ("is<First>() && \"Val is not the first pointer\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerUnion.h"
, 216, __PRETTY_FUNCTION__))
;
217 assert(((PointerLikeTypeTraits<First>::getAsVoidPointer(get<
First>()) == this->Val.getPointer() && "Can't get the address because PointerLikeTypeTraits changes the ptr"
) ? static_cast<void> (0) : __assert_fail ("PointerLikeTypeTraits<First>::getAsVoidPointer(get<First>()) == this->Val.getPointer() && \"Can't get the address because PointerLikeTypeTraits changes the ptr\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerUnion.h"
, 220, __PRETTY_FUNCTION__))
218 PointerLikeTypeTraits<First>::getAsVoidPointer(get<First>()) ==((PointerLikeTypeTraits<First>::getAsVoidPointer(get<
First>()) == this->Val.getPointer() && "Can't get the address because PointerLikeTypeTraits changes the ptr"
) ? static_cast<void> (0) : __assert_fail ("PointerLikeTypeTraits<First>::getAsVoidPointer(get<First>()) == this->Val.getPointer() && \"Can't get the address because PointerLikeTypeTraits changes the ptr\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerUnion.h"
, 220, __PRETTY_FUNCTION__))
219 this->Val.getPointer() &&((PointerLikeTypeTraits<First>::getAsVoidPointer(get<
First>()) == this->Val.getPointer() && "Can't get the address because PointerLikeTypeTraits changes the ptr"
) ? static_cast<void> (0) : __assert_fail ("PointerLikeTypeTraits<First>::getAsVoidPointer(get<First>()) == this->Val.getPointer() && \"Can't get the address because PointerLikeTypeTraits changes the ptr\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerUnion.h"
, 220, __PRETTY_FUNCTION__))
220 "Can't get the address because PointerLikeTypeTraits changes the ptr")((PointerLikeTypeTraits<First>::getAsVoidPointer(get<
First>()) == this->Val.getPointer() && "Can't get the address because PointerLikeTypeTraits changes the ptr"
) ? static_cast<void> (0) : __assert_fail ("PointerLikeTypeTraits<First>::getAsVoidPointer(get<First>()) == this->Val.getPointer() && \"Can't get the address because PointerLikeTypeTraits changes the ptr\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerUnion.h"
, 220, __PRETTY_FUNCTION__))
;
221 return const_cast<First *>(
222 reinterpret_cast<const First *>(this->Val.getAddrOfPointer()));
223 }
224
225 /// Assignment from nullptr which just clears the union.
226 const PointerUnion &operator=(std::nullptr_t) {
227 this->Val.initWithPointer(nullptr);
228 return *this;
229 }
230
231 /// Assignment from elements of the union.
232 using Base::operator=;
233
234 void *getOpaqueValue() const { return this->Val.getOpaqueValue(); }
235 static inline PointerUnion getFromOpaqueValue(void *VP) {
236 PointerUnion V;
237 V.Val = decltype(V.Val)::getFromOpaqueValue(VP);
238 return V;
239 }
240};
241
242template <typename ...PTs>
243bool operator==(PointerUnion<PTs...> lhs, PointerUnion<PTs...> rhs) {
244 return lhs.getOpaqueValue() == rhs.getOpaqueValue();
245}
246
247template <typename ...PTs>
248bool operator!=(PointerUnion<PTs...> lhs, PointerUnion<PTs...> rhs) {
249 return lhs.getOpaqueValue() != rhs.getOpaqueValue();
250}
251
252template <typename ...PTs>
253bool operator<(PointerUnion<PTs...> lhs, PointerUnion<PTs...> rhs) {
254 return lhs.getOpaqueValue() < rhs.getOpaqueValue();
255}
256
257// Teach SmallPtrSet that PointerUnion is "basically a pointer", that has
258// # low bits available = min(PT1bits,PT2bits)-1.
259template <typename ...PTs>
260struct PointerLikeTypeTraits<PointerUnion<PTs...>> {
261 static inline void *getAsVoidPointer(const PointerUnion<PTs...> &P) {
262 return P.getOpaqueValue();
263 }
264
265 static inline PointerUnion<PTs...> getFromVoidPointer(void *P) {
266 return PointerUnion<PTs...>::getFromOpaqueValue(P);
267 }
268
269 // The number of bits available are the min of the pointer types minus the
270 // bits needed for the discriminator.
271 static constexpr int NumLowBitsAvailable = PointerLikeTypeTraits<decltype(
272 PointerUnion<PTs...>::Val)>::NumLowBitsAvailable;
273};
274
275/// A pointer union of three pointer types. See documentation for PointerUnion
276/// for usage.
277template <typename PT1, typename PT2, typename PT3>
278using PointerUnion3 = PointerUnion<PT1, PT2, PT3>;
279
280/// A pointer union of four pointer types. See documentation for PointerUnion
281/// for usage.
282template <typename PT1, typename PT2, typename PT3, typename PT4>
283using PointerUnion4 = PointerUnion<PT1, PT2, PT3, PT4>;
284
285// Teach DenseMap how to use PointerUnions as keys.
286template <typename ...PTs> struct DenseMapInfo<PointerUnion<PTs...>> {
287 using Union = PointerUnion<PTs...>;
288 using FirstInfo =
289 DenseMapInfo<typename pointer_union_detail::GetFirstType<PTs...>::type>;
290
291 static inline Union getEmptyKey() { return Union(FirstInfo::getEmptyKey()); }
292
293 static inline Union getTombstoneKey() {
294 return Union(FirstInfo::getTombstoneKey());
295 }
296
297 static unsigned getHashValue(const Union &UnionVal) {
298 intptr_t key = (intptr_t)UnionVal.getOpaqueValue();
299 return DenseMapInfo<intptr_t>::getHashValue(key);
300 }
301
302 static bool isEqual(const Union &LHS, const Union &RHS) {
303 return LHS == RHS;
304 }
305};
306
307} // end namespace llvm
308
309#endif // LLVM_ADT_POINTERUNION_H

/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerIntPair.h

1//===- llvm/ADT/PointerIntPair.h - Pair for pointer and int -----*- C++ -*-===//
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 defines the PointerIntPair class.
10//
11//===----------------------------------------------------------------------===//
12
13#ifndef LLVM_ADT_POINTERINTPAIR_H
14#define LLVM_ADT_POINTERINTPAIR_H
15
16#include "llvm/Support/Compiler.h"
17#include "llvm/Support/PointerLikeTypeTraits.h"
18#include "llvm/Support/type_traits.h"
19#include <cassert>
20#include <cstdint>
21#include <limits>
22
23namespace llvm {
24
25template <typename T> struct DenseMapInfo;
26template <typename PointerT, unsigned IntBits, typename PtrTraits>
27struct PointerIntPairInfo;
28
29/// PointerIntPair - This class implements a pair of a pointer and small
30/// integer. It is designed to represent this in the space required by one
31/// pointer by bitmangling the integer into the low part of the pointer. This
32/// can only be done for small integers: typically up to 3 bits, but it depends
33/// on the number of bits available according to PointerLikeTypeTraits for the
34/// type.
35///
36/// Note that PointerIntPair always puts the IntVal part in the highest bits
37/// possible. For example, PointerIntPair<void*, 1, bool> will put the bit for
38/// the bool into bit #2, not bit #0, which allows the low two bits to be used
39/// for something else. For example, this allows:
40/// PointerIntPair<PointerIntPair<void*, 1, bool>, 1, bool>
41/// ... and the two bools will land in different bits.
42template <typename PointerTy, unsigned IntBits, typename IntType = unsigned,
43 typename PtrTraits = PointerLikeTypeTraits<PointerTy>,
44 typename Info = PointerIntPairInfo<PointerTy, IntBits, PtrTraits>>
45class PointerIntPair {
46 // Used by MSVC visualizer and generally helpful for debugging/visualizing.
47 using InfoTy = Info;
48 intptr_t Value = 0;
49
50public:
51 constexpr PointerIntPair() = default;
52
53 PointerIntPair(PointerTy PtrVal, IntType IntVal) {
54 setPointerAndInt(PtrVal, IntVal);
55 }
56
57 explicit PointerIntPair(PointerTy PtrVal) { initWithPointer(PtrVal); }
58
59 PointerTy getPointer() const { return Info::getPointer(Value); }
45
Calling 'PointerIntPairInfo::getPointer'
50
Returning from 'PointerIntPairInfo::getPointer'
51
Returning null pointer, which participates in a condition later
60
61 IntType getInt() const { return (IntType)Info::getInt(Value); }
62
63 void setPointer(PointerTy PtrVal) LLVM_LVALUE_FUNCTION& {
64 Value = Info::updatePointer(Value, PtrVal);
65 }
66
67 void setInt(IntType IntVal) LLVM_LVALUE_FUNCTION& {
68 Value = Info::updateInt(Value, static_cast<intptr_t>(IntVal));
69 }
70
71 void initWithPointer(PointerTy PtrVal) LLVM_LVALUE_FUNCTION& {
72 Value = Info::updatePointer(0, PtrVal);
73 }
74
75 void setPointerAndInt(PointerTy PtrVal, IntType IntVal) LLVM_LVALUE_FUNCTION& {
76 Value = Info::updateInt(Info::updatePointer(0, PtrVal),
77 static_cast<intptr_t>(IntVal));
78 }
79
80 PointerTy const *getAddrOfPointer() const {
81 return const_cast<PointerIntPair *>(this)->getAddrOfPointer();
82 }
83
84 PointerTy *getAddrOfPointer() {
85 assert(Value == reinterpret_cast<intptr_t>(getPointer()) &&((Value == reinterpret_cast<intptr_t>(getPointer()) &&
"Can only return the address if IntBits is cleared and " "PtrTraits doesn't change the pointer"
) ? static_cast<void> (0) : __assert_fail ("Value == reinterpret_cast<intptr_t>(getPointer()) && \"Can only return the address if IntBits is cleared and \" \"PtrTraits doesn't change the pointer\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerIntPair.h"
, 87, __PRETTY_FUNCTION__))
86 "Can only return the address if IntBits is cleared and "((Value == reinterpret_cast<intptr_t>(getPointer()) &&
"Can only return the address if IntBits is cleared and " "PtrTraits doesn't change the pointer"
) ? static_cast<void> (0) : __assert_fail ("Value == reinterpret_cast<intptr_t>(getPointer()) && \"Can only return the address if IntBits is cleared and \" \"PtrTraits doesn't change the pointer\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerIntPair.h"
, 87, __PRETTY_FUNCTION__))
87 "PtrTraits doesn't change the pointer")((Value == reinterpret_cast<intptr_t>(getPointer()) &&
"Can only return the address if IntBits is cleared and " "PtrTraits doesn't change the pointer"
) ? static_cast<void> (0) : __assert_fail ("Value == reinterpret_cast<intptr_t>(getPointer()) && \"Can only return the address if IntBits is cleared and \" \"PtrTraits doesn't change the pointer\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerIntPair.h"
, 87, __PRETTY_FUNCTION__))
;
88 return reinterpret_cast<PointerTy *>(&Value);
89 }
90
91 void *getOpaqueValue() const { return reinterpret_cast<void *>(Value); }
92
93 void setFromOpaqueValue(void *Val) LLVM_LVALUE_FUNCTION& {
94 Value = reinterpret_cast<intptr_t>(Val);
95 }
96
97 static PointerIntPair getFromOpaqueValue(void *V) {
98 PointerIntPair P;
99 P.setFromOpaqueValue(V);
100 return P;
101 }
102
103 // Allow PointerIntPairs to be created from const void * if and only if the
104 // pointer type could be created from a const void *.
105 static PointerIntPair getFromOpaqueValue(const void *V) {
106 (void)PtrTraits::getFromVoidPointer(V);
107 return getFromOpaqueValue(const_cast<void *>(V));
108 }
109
110 bool operator==(const PointerIntPair &RHS) const {
111 return Value == RHS.Value;
112 }
113
114 bool operator!=(const PointerIntPair &RHS) const {
115 return Value != RHS.Value;
116 }
117
118 bool operator<(const PointerIntPair &RHS) const { return Value < RHS.Value; }
119 bool operator>(const PointerIntPair &RHS) const { return Value > RHS.Value; }
120
121 bool operator<=(const PointerIntPair &RHS) const {
122 return Value <= RHS.Value;
123 }
124
125 bool operator>=(const PointerIntPair &RHS) const {
126 return Value >= RHS.Value;
127 }
128};
129
130// Specialize is_trivially_copyable to avoid limitation of llvm::is_trivially_copyable
131// when compiled with gcc 4.9.
132template <typename PointerTy, unsigned IntBits, typename IntType,
133 typename PtrTraits,
134 typename Info>
135struct is_trivially_copyable<PointerIntPair<PointerTy, IntBits, IntType, PtrTraits, Info>> : std::true_type {
136#ifdef HAVE_STD_IS_TRIVIALLY_COPYABLE
137 static_assert(std::is_trivially_copyable<PointerIntPair<PointerTy, IntBits, IntType, PtrTraits, Info>>::value,
138 "inconsistent behavior between llvm:: and std:: implementation of is_trivially_copyable");
139#endif
140};
141
142
143template <typename PointerT, unsigned IntBits, typename PtrTraits>
144struct PointerIntPairInfo {
145 static_assert(PtrTraits::NumLowBitsAvailable <
146 std::numeric_limits<uintptr_t>::digits,
147 "cannot use a pointer type that has all bits free");
148 static_assert(IntBits <= PtrTraits::NumLowBitsAvailable,
149 "PointerIntPair with integer size too large for pointer");
150 enum : uintptr_t {
151 /// PointerBitMask - The bits that come from the pointer.
152 PointerBitMask =
153 ~(uintptr_t)(((intptr_t)1 << PtrTraits::NumLowBitsAvailable) - 1),
154
155 /// IntShift - The number of low bits that we reserve for other uses, and
156 /// keep zero.
157 IntShift = (uintptr_t)PtrTraits::NumLowBitsAvailable - IntBits,
158
159 /// IntMask - This is the unshifted mask for valid bits of the int type.
160 IntMask = (uintptr_t)(((intptr_t)1 << IntBits) - 1),
161
162 // ShiftedIntMask - This is the bits for the integer shifted in place.
163 ShiftedIntMask = (uintptr_t)(IntMask << IntShift)
164 };
165
166 static PointerT getPointer(intptr_t Value) {
167 return PtrTraits::getFromVoidPointer(
46
Calling 'PointerUnionUIntTraits::getFromVoidPointer'
48
Returning from 'PointerUnionUIntTraits::getFromVoidPointer'
49
Returning null pointer, which participates in a condition later
168 reinterpret_cast<void *>(Value & PointerBitMask));
169 }
170
171 static intptr_t getInt(intptr_t Value) {
172 return (Value >> IntShift) & IntMask;
173 }
174
175 static intptr_t updatePointer(intptr_t OrigValue, PointerT Ptr) {
176 intptr_t PtrWord =
177 reinterpret_cast<intptr_t>(PtrTraits::getAsVoidPointer(Ptr));
178 assert((PtrWord & ~PointerBitMask) == 0 &&(((PtrWord & ~PointerBitMask) == 0 && "Pointer is not sufficiently aligned"
) ? static_cast<void> (0) : __assert_fail ("(PtrWord & ~PointerBitMask) == 0 && \"Pointer is not sufficiently aligned\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerIntPair.h"
, 179, __PRETTY_FUNCTION__))
179 "Pointer is not sufficiently aligned")(((PtrWord & ~PointerBitMask) == 0 && "Pointer is not sufficiently aligned"
) ? static_cast<void> (0) : __assert_fail ("(PtrWord & ~PointerBitMask) == 0 && \"Pointer is not sufficiently aligned\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerIntPair.h"
, 179, __PRETTY_FUNCTION__))
;
180 // Preserve all low bits, just update the pointer.
181 return PtrWord | (OrigValue & ~PointerBitMask);
182 }
183
184 static intptr_t updateInt(intptr_t OrigValue, intptr_t Int) {
185 intptr_t IntWord = static_cast<intptr_t>(Int);
186 assert((IntWord & ~IntMask) == 0 && "Integer too large for field")(((IntWord & ~IntMask) == 0 && "Integer too large for field"
) ? static_cast<void> (0) : __assert_fail ("(IntWord & ~IntMask) == 0 && \"Integer too large for field\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include/llvm/ADT/PointerIntPair.h"
, 186, __PRETTY_FUNCTION__))
;
187
188 // Preserve all bits other than the ones we are updating.
189 return (OrigValue & ~ShiftedIntMask) | IntWord << IntShift;
190 }
191};
192
193// Provide specialization of DenseMapInfo for PointerIntPair.
194template <typename PointerTy, unsigned IntBits, typename IntType>
195struct DenseMapInfo<PointerIntPair<PointerTy, IntBits, IntType>> {
196 using Ty = PointerIntPair<PointerTy, IntBits, IntType>;
197
198 static Ty getEmptyKey() {
199 uintptr_t Val = static_cast<uintptr_t>(-1);
200 Val <<= PointerLikeTypeTraits<Ty>::NumLowBitsAvailable;
201 return Ty::getFromOpaqueValue(reinterpret_cast<void *>(Val));
202 }
203
204 static Ty getTombstoneKey() {
205 uintptr_t Val = static_cast<uintptr_t>(-2);
206 Val <<= PointerLikeTypeTraits<PointerTy>::NumLowBitsAvailable;
207 return Ty::getFromOpaqueValue(reinterpret_cast<void *>(Val));
208 }
209
210 static unsigned getHashValue(Ty V) {
211 uintptr_t IV = reinterpret_cast<uintptr_t>(V.getOpaqueValue());
212 return unsigned(IV) ^ unsigned(IV >> 9);
213 }
214
215 static bool isEqual(const Ty &LHS, const Ty &RHS) { return LHS == RHS; }
216};
217
218// Teach SmallPtrSet that PointerIntPair is "basically a pointer".
219template <typename PointerTy, unsigned IntBits, typename IntType,
220 typename PtrTraits>
221struct PointerLikeTypeTraits<
222 PointerIntPair<PointerTy, IntBits, IntType, PtrTraits>> {
223 static inline void *
224 getAsVoidPointer(const PointerIntPair<PointerTy, IntBits, IntType> &P) {
225 return P.getOpaqueValue();
226 }
227
228 static inline PointerIntPair<PointerTy, IntBits, IntType>
229 getFromVoidPointer(void *P) {
230 return PointerIntPair<PointerTy, IntBits, IntType>::getFromOpaqueValue(P);
231 }
232
233 static inline PointerIntPair<PointerTy, IntBits, IntType>
234 getFromVoidPointer(const void *P) {
235 return PointerIntPair<PointerTy, IntBits, IntType>::getFromOpaqueValue(P);
236 }
237
238 enum { NumLowBitsAvailable = PtrTraits::NumLowBitsAvailable - IntBits };
239};
240
241} // end namespace llvm
242
243#endif // LLVM_ADT_POINTERINTPAIR_H

/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/Sema/Overload.h

1//===- Overload.h - C++ Overloading -----------------------------*- C++ -*-===//
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 defines the data structures and types used in C++
10// overload resolution.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CLANG_SEMA_OVERLOAD_H
15#define LLVM_CLANG_SEMA_OVERLOAD_H
16
17#include "clang/AST/Decl.h"
18#include "clang/AST/DeclAccessPair.h"
19#include "clang/AST/DeclBase.h"
20#include "clang/AST/DeclCXX.h"
21#include "clang/AST/DeclTemplate.h"
22#include "clang/AST/Expr.h"
23#include "clang/AST/Type.h"
24#include "clang/Basic/LLVM.h"
25#include "clang/Basic/SourceLocation.h"
26#include "clang/Sema/SemaFixItUtils.h"
27#include "clang/Sema/TemplateDeduction.h"
28#include "llvm/ADT/ArrayRef.h"
29#include "llvm/ADT/None.h"
30#include "llvm/ADT/STLExtras.h"
31#include "llvm/ADT/SmallPtrSet.h"
32#include "llvm/ADT/SmallVector.h"
33#include "llvm/ADT/StringRef.h"
34#include "llvm/Support/AlignOf.h"
35#include "llvm/Support/Allocator.h"
36#include "llvm/Support/Casting.h"
37#include "llvm/Support/ErrorHandling.h"
38#include <cassert>
39#include <cstddef>
40#include <cstdint>
41#include <utility>
42
43namespace clang {
44
45class APValue;
46class ASTContext;
47class Sema;
48
49 /// OverloadingResult - Capture the result of performing overload
50 /// resolution.
51 enum OverloadingResult {
52 /// Overload resolution succeeded.
53 OR_Success,
54
55 /// No viable function found.
56 OR_No_Viable_Function,
57
58 /// Ambiguous candidates found.
59 OR_Ambiguous,
60
61 /// Succeeded, but refers to a deleted function.
62 OR_Deleted
63 };
64
65 enum OverloadCandidateDisplayKind {
66 /// Requests that all candidates be shown. Viable candidates will
67 /// be printed first.
68 OCD_AllCandidates,
69
70 /// Requests that only viable candidates be shown.
71 OCD_ViableCandidates,
72
73 /// Requests that only tied-for-best candidates be shown.
74 OCD_AmbiguousCandidates
75 };
76
77 /// The parameter ordering that will be used for the candidate. This is
78 /// used to represent C++20 binary operator rewrites that reverse the order
79 /// of the arguments. If the parameter ordering is Reversed, the Args list is
80 /// reversed (but obviously the ParamDecls for the function are not).
81 ///
82 /// After forming an OverloadCandidate with reversed parameters, the list
83 /// of conversions will (as always) be indexed by argument, so will be
84 /// in reverse parameter order.
85 enum class OverloadCandidateParamOrder : char { Normal, Reversed };
86
87 /// The kinds of rewrite we perform on overload candidates. Note that the
88 /// values here are chosen to serve as both bitflags and as a rank (lower
89 /// values are preferred by overload resolution).
90 enum OverloadCandidateRewriteKind : unsigned {
91 /// Candidate is not a rewritten candidate.
92 CRK_None = 0x0,
93
94 /// Candidate is a rewritten candidate with a different operator name.
95 CRK_DifferentOperator = 0x1,
96
97 /// Candidate is a rewritten candidate with a reversed order of parameters.
98 CRK_Reversed = 0x2,
99 };
100
101 /// ImplicitConversionKind - The kind of implicit conversion used to
102 /// convert an argument to a parameter's type. The enumerator values
103 /// match with the table titled 'Conversions' in [over.ics.scs] and are listed
104 /// such that better conversion kinds have smaller values.
105 enum ImplicitConversionKind {
106 /// Identity conversion (no conversion)
107 ICK_Identity = 0,
108
109 /// Lvalue-to-rvalue conversion (C++ [conv.lval])
110 ICK_Lvalue_To_Rvalue,
111
112 /// Array-to-pointer conversion (C++ [conv.array])
113 ICK_Array_To_Pointer,
114
115 /// Function-to-pointer (C++ [conv.array])
116 ICK_Function_To_Pointer,
117
118 /// Function pointer conversion (C++17 [conv.fctptr])
119 ICK_Function_Conversion,
120
121 /// Qualification conversions (C++ [conv.qual])
122 ICK_Qualification,
123
124 /// Integral promotions (C++ [conv.prom])
125 ICK_Integral_Promotion,
126
127 /// Floating point promotions (C++ [conv.fpprom])
128 ICK_Floating_Promotion,
129
130 /// Complex promotions (Clang extension)
131 ICK_Complex_Promotion,
132
133 /// Integral conversions (C++ [conv.integral])
134 ICK_Integral_Conversion,
135
136 /// Floating point conversions (C++ [conv.double]
137 ICK_Floating_Conversion,
138
139 /// Complex conversions (C99 6.3.1.6)
140 ICK_Complex_Conversion,
141
142 /// Floating-integral conversions (C++ [conv.fpint])
143 ICK_Floating_Integral,
144
145 /// Pointer conversions (C++ [conv.ptr])
146 ICK_Pointer_Conversion,
147
148 /// Pointer-to-member conversions (C++ [conv.mem])
149 ICK_Pointer_Member,
150
151 /// Boolean conversions (C++ [conv.bool])
152 ICK_Boolean_Conversion,
153
154 /// Conversions between compatible types in C99
155 ICK_Compatible_Conversion,
156
157 /// Derived-to-base (C++ [over.best.ics])
158 ICK_Derived_To_Base,
159
160 /// Vector conversions
161 ICK_Vector_Conversion,
162
163 /// A vector splat from an arithmetic type
164 ICK_Vector_Splat,
165
166 /// Complex-real conversions (C99 6.3.1.7)
167 ICK_Complex_Real,
168
169 /// Block Pointer conversions
170 ICK_Block_Pointer_Conversion,
171
172 /// Transparent Union Conversions
173 ICK_TransparentUnionConversion,
174
175 /// Objective-C ARC writeback conversion
176 ICK_Writeback_Conversion,
177
178 /// Zero constant to event (OpenCL1.2 6.12.10)
179 ICK_Zero_Event_Conversion,
180
181 /// Zero constant to queue
182 ICK_Zero_Queue_Conversion,
183
184 /// Conversions allowed in C, but not C++
185 ICK_C_Only_Conversion,
186
187 /// C-only conversion between pointers with incompatible types
188 ICK_Incompatible_Pointer_Conversion,
189
190 /// The number of conversion kinds
191 ICK_Num_Conversion_Kinds,
192 };
193
194 /// ImplicitConversionRank - The rank of an implicit conversion
195 /// kind. The enumerator values match with Table 9 of (C++
196 /// 13.3.3.1.1) and are listed such that better conversion ranks
197 /// have smaller values.
198 enum ImplicitConversionRank {
199 /// Exact Match
200 ICR_Exact_Match = 0,
201
202 /// Promotion
203 ICR_Promotion,
204
205 /// Conversion
206 ICR_Conversion,
207
208 /// OpenCL Scalar Widening
209 ICR_OCL_Scalar_Widening,
210
211 /// Complex <-> Real conversion
212 ICR_Complex_Real_Conversion,
213
214 /// ObjC ARC writeback conversion
215 ICR_Writeback_Conversion,
216
217 /// Conversion only allowed in the C standard (e.g. void* to char*).
218 ICR_C_Conversion,
219
220 /// Conversion not allowed by the C standard, but that we accept as an
221 /// extension anyway.
222 ICR_C_Conversion_Extension
223 };
224
225 ImplicitConversionRank GetConversionRank(ImplicitConversionKind Kind);
226
227 /// NarrowingKind - The kind of narrowing conversion being performed by a
228 /// standard conversion sequence according to C++11 [dcl.init.list]p7.
229 enum NarrowingKind {
230 /// Not a narrowing conversion.
231 NK_Not_Narrowing,
232
233 /// A narrowing conversion by virtue of the source and destination types.
234 NK_Type_Narrowing,
235
236 /// A narrowing conversion, because a constant expression got narrowed.
237 NK_Constant_Narrowing,
238
239 /// A narrowing conversion, because a non-constant-expression variable might
240 /// have got narrowed.
241 NK_Variable_Narrowing,
242
243 /// Cannot tell whether this is a narrowing conversion because the
244 /// expression is value-dependent.
245 NK_Dependent_Narrowing,
246 };
247
248 /// StandardConversionSequence - represents a standard conversion
249 /// sequence (C++ 13.3.3.1.1). A standard conversion sequence
250 /// contains between zero and three conversions. If a particular
251 /// conversion is not needed, it will be set to the identity conversion
252 /// (ICK_Identity). Note that the three conversions are
253 /// specified as separate members (rather than in an array) so that
254 /// we can keep the size of a standard conversion sequence to a
255 /// single word.
256 class StandardConversionSequence {
257 public:
258 /// First -- The first conversion can be an lvalue-to-rvalue
259 /// conversion, array-to-pointer conversion, or
260 /// function-to-pointer conversion.
261 ImplicitConversionKind First : 8;
262
263 /// Second - The second conversion can be an integral promotion,
264 /// floating point promotion, integral conversion, floating point
265 /// conversion, floating-integral conversion, pointer conversion,
266 /// pointer-to-member conversion, or boolean conversion.
267 ImplicitConversionKind Second : 8;
268
269 /// Third - The third conversion can be a qualification conversion
270 /// or a function conversion.
271 ImplicitConversionKind Third : 8;
272
273 /// Whether this is the deprecated conversion of a
274 /// string literal to a pointer to non-const character data
275 /// (C++ 4.2p2).
276 unsigned DeprecatedStringLiteralToCharPtr : 1;
277
278 /// Whether the qualification conversion involves a change in the
279 /// Objective-C lifetime (for automatic reference counting).
280 unsigned QualificationIncludesObjCLifetime : 1;
281
282 /// IncompatibleObjC - Whether this is an Objective-C conversion
283 /// that we should warn about (if we actually use it).
284 unsigned IncompatibleObjC : 1;
285
286 /// ReferenceBinding - True when this is a reference binding
287 /// (C++ [over.ics.ref]).
288 unsigned ReferenceBinding : 1;
289
290 /// DirectBinding - True when this is a reference binding that is a
291 /// direct binding (C++ [dcl.init.ref]).
292 unsigned DirectBinding : 1;
293
294 /// Whether this is an lvalue reference binding (otherwise, it's
295 /// an rvalue reference binding).
296 unsigned IsLvalueReference : 1;
297
298 /// Whether we're binding to a function lvalue.
299 unsigned BindsToFunctionLvalue : 1;
300
301 /// Whether we're binding to an rvalue.
302 unsigned BindsToRvalue : 1;
303
304 /// Whether this binds an implicit object argument to a
305 /// non-static member function without a ref-qualifier.
306 unsigned BindsImplicitObjectArgumentWithoutRefQualifier : 1;
307
308 /// Whether this binds a reference to an object with a different
309 /// Objective-C lifetime qualifier.
310 unsigned ObjCLifetimeConversionBinding : 1;
311
312 /// FromType - The type that this conversion is converting
313 /// from. This is an opaque pointer that can be translated into a
314 /// QualType.
315 void *FromTypePtr;
316
317 /// ToType - The types that this conversion is converting to in
318 /// each step. This is an opaque pointer that can be translated
319 /// into a QualType.
320 void *ToTypePtrs[3];
321
322 /// CopyConstructor - The copy constructor that is used to perform
323 /// this conversion, when the conversion is actually just the
324 /// initialization of an object via copy constructor. Such
325 /// conversions are either identity conversions or derived-to-base
326 /// conversions.
327 CXXConstructorDecl *CopyConstructor;
328 DeclAccessPair FoundCopyConstructor;
329
330 void setFromType(QualType T) { FromTypePtr = T.getAsOpaquePtr(); }
331
332 void setToType(unsigned Idx, QualType T) {
333 assert(Idx < 3 && "To type index is out of range")((Idx < 3 && "To type index is out of range") ? static_cast
<void> (0) : __assert_fail ("Idx < 3 && \"To type index is out of range\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/Sema/Overload.h"
, 333, __PRETTY_FUNCTION__))
;
334 ToTypePtrs[Idx] = T.getAsOpaquePtr();
335 }
336
337 void setAllToTypes(QualType T) {
338 ToTypePtrs[0] = T.getAsOpaquePtr();
339 ToTypePtrs[1] = ToTypePtrs[0];
340 ToTypePtrs[2] = ToTypePtrs[0];
341 }
342
343 QualType getFromType() const {
344 return QualType::getFromOpaquePtr(FromTypePtr);
345 }
346
347 QualType getToType(unsigned Idx) const {
348 assert(Idx < 3 && "To type index is out of range")((Idx < 3 && "To type index is out of range") ? static_cast
<void> (0) : __assert_fail ("Idx < 3 && \"To type index is out of range\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/Sema/Overload.h"
, 348, __PRETTY_FUNCTION__))
;
349 return QualType::getFromOpaquePtr(ToTypePtrs[Idx]);
350 }
351
352 void setAsIdentityConversion();
353
354 bool isIdentityConversion() const {
355 return Second == ICK_Identity && Third == ICK_Identity;
356 }
357
358 ImplicitConversionRank getRank() const;
359 NarrowingKind
360 getNarrowingKind(ASTContext &Context, const Expr *Converted,
361 APValue &ConstantValue, QualType &ConstantType,
362 bool IgnoreFloatToIntegralConversion = false) const;
363 bool isPointerConversionToBool() const;
364 bool isPointerConversionToVoidPointer(ASTContext& Context) const;
365 void dump() const;
366 };
367
368 /// UserDefinedConversionSequence - Represents a user-defined
369 /// conversion sequence (C++ 13.3.3.1.2).
370 struct UserDefinedConversionSequence {
371 /// Represents the standard conversion that occurs before
372 /// the actual user-defined conversion.
373 ///
374 /// C++11 13.3.3.1.2p1:
375 /// If the user-defined conversion is specified by a constructor
376 /// (12.3.1), the initial standard conversion sequence converts
377 /// the source type to the type required by the argument of the
378 /// constructor. If the user-defined conversion is specified by
379 /// a conversion function (12.3.2), the initial standard
380 /// conversion sequence converts the source type to the implicit
381 /// object parameter of the conversion function.
382 StandardConversionSequence Before;
383
384 /// EllipsisConversion - When this is true, it means user-defined
385 /// conversion sequence starts with a ... (ellipsis) conversion, instead of
386 /// a standard conversion. In this case, 'Before' field must be ignored.
387 // FIXME. I much rather put this as the first field. But there seems to be
388 // a gcc code gen. bug which causes a crash in a test. Putting it here seems
389 // to work around the crash.
390 bool EllipsisConversion : 1;
391
392 /// HadMultipleCandidates - When this is true, it means that the
393 /// conversion function was resolved from an overloaded set having
394 /// size greater than 1.
395 bool HadMultipleCandidates : 1;
396
397 /// After - Represents the standard conversion that occurs after
398 /// the actual user-defined conversion.
399 StandardConversionSequence After;
400
401 /// ConversionFunction - The function that will perform the
402 /// user-defined conversion. Null if the conversion is an
403 /// aggregate initialization from an initializer list.
404 FunctionDecl* ConversionFunction;
405
406 /// The declaration that we found via name lookup, which might be
407 /// the same as \c ConversionFunction or it might be a using declaration
408 /// that refers to \c ConversionFunction.
409 DeclAccessPair FoundConversionFunction;
410
411 void dump() const;
412 };
413
414 /// Represents an ambiguous user-defined conversion sequence.
415 struct AmbiguousConversionSequence {
416 using ConversionSet =
417 SmallVector<std::pair<NamedDecl *, FunctionDecl *>, 4>;
418
419 void *FromTypePtr;
420 void *ToTypePtr;
421 char Buffer[sizeof(ConversionSet)];
422
423 QualType getFromType() const {
424 return QualType::getFromOpaquePtr(FromTypePtr);
425 }
426
427 QualType getToType() const {
428 return QualType::getFromOpaquePtr(ToTypePtr);
429 }
430
431 void setFromType(QualType T) { FromTypePtr = T.getAsOpaquePtr(); }
432 void setToType(QualType T) { ToTypePtr = T.getAsOpaquePtr(); }
433
434 ConversionSet &conversions() {
435 return *reinterpret_cast<ConversionSet*>(Buffer);
436 }
437
438 const ConversionSet &conversions() const {
439 return *reinterpret_cast<const ConversionSet*>(Buffer);
440 }
441
442 void addConversion(NamedDecl *Found, FunctionDecl *D) {
443 conversions().push_back(std::make_pair(Found, D));
444 }
445
446 using iterator = ConversionSet::iterator;
447
448 iterator begin() { return conversions().begin(); }
449 iterator end() { return conversions().end(); }
450
451 using const_iterator = ConversionSet::const_iterator;
452
453 const_iterator begin() const { return conversions().begin(); }
454 const_iterator end() const { return conversions().end(); }
455
456 void construct();
457 void destruct();
458 void copyFrom(const AmbiguousConversionSequence &);
459 };
460
461 /// BadConversionSequence - Records information about an invalid
462 /// conversion sequence.
463 struct BadConversionSequence {
464 enum FailureKind {
465 no_conversion,
466 unrelated_class,
467 bad_qualifiers,
468 lvalue_ref_to_rvalue,
469 rvalue_ref_to_lvalue
470 };
471
472 // This can be null, e.g. for implicit object arguments.
473 Expr *FromExpr;
474
475 FailureKind Kind;
476
477 private:
478 // The type we're converting from (an opaque QualType).
479 void *FromTy;
480
481 // The type we're converting to (an opaque QualType).
482 void *ToTy;
483
484 public:
485 void init(FailureKind K, Expr *From, QualType To) {
486 init(K, From->getType(), To);
487 FromExpr = From;
488 }
489
490 void init(FailureKind K, QualType From, QualType To) {
491 Kind = K;
492 FromExpr = nullptr;
493 setFromType(From);
494 setToType(To);
495 }
496
497 QualType getFromType() const { return QualType::getFromOpaquePtr(FromTy); }
498 QualType getToType() const { return QualType::getFromOpaquePtr(ToTy); }
499
500 void setFromExpr(Expr *E) {
501 FromExpr = E;
502 setFromType(E->getType());
503 }
504
505 void setFromType(QualType T) { FromTy = T.getAsOpaquePtr(); }
506 void setToType(QualType T) { ToTy = T.getAsOpaquePtr(); }
507 };
508
509 /// ImplicitConversionSequence - Represents an implicit conversion
510 /// sequence, which may be a standard conversion sequence
511 /// (C++ 13.3.3.1.1), user-defined conversion sequence (C++ 13.3.3.1.2),
512 /// or an ellipsis conversion sequence (C++ 13.3.3.1.3).
513 class ImplicitConversionSequence {
514 public:
515 /// Kind - The kind of implicit conversion sequence. BadConversion
516 /// specifies that there is no conversion from the source type to
517 /// the target type. AmbiguousConversion represents the unique
518 /// ambiguous conversion (C++0x [over.best.ics]p10).
519 enum Kind {
520 StandardConversion = 0,
521 UserDefinedConversion,
522 AmbiguousConversion,
523 EllipsisConversion,
524 BadConversion
525 };
526
527 private:
528 enum {
529 Uninitialized = BadConversion + 1
530 };
531
532 /// ConversionKind - The kind of implicit conversion sequence.
533 unsigned ConversionKind : 30;
534
535 /// Whether the target is really a std::initializer_list, and the
536 /// sequence only represents the worst element conversion.
537 unsigned StdInitializerListElement : 1;
538
539 void setKind(Kind K) {
540 destruct();
541 ConversionKind = K;
542 }
543
544 void destruct() {
545 if (ConversionKind == AmbiguousConversion) Ambiguous.destruct();
546 }
547
548 public:
549 union {
550 /// When ConversionKind == StandardConversion, provides the
551 /// details of the standard conversion sequence.
552 StandardConversionSequence Standard;
553
554 /// When ConversionKind == UserDefinedConversion, provides the
555 /// details of the user-defined conversion sequence.
556 UserDefinedConversionSequence UserDefined;
557
558 /// When ConversionKind == AmbiguousConversion, provides the
559 /// details of the ambiguous conversion.
560 AmbiguousConversionSequence Ambiguous;
561
562 /// When ConversionKind == BadConversion, provides the details
563 /// of the bad conversion.
564 BadConversionSequence Bad;
565 };
566
567 ImplicitConversionSequence()
568 : ConversionKind(Uninitialized), StdInitializerListElement(false) {
569 Standard.setAsIdentityConversion();
570 }
571
572 ImplicitConversionSequence(const ImplicitConversionSequence &Other)
573 : ConversionKind(Other.ConversionKind),
574 StdInitializerListElement(Other.StdInitializerListElement) {
575 switch (ConversionKind) {
576 case Uninitialized: break;
577 case StandardConversion: Standard = Other.Standard; break;
578 case UserDefinedConversion: UserDefined = Other.UserDefined; break;
579 case AmbiguousConversion: Ambiguous.copyFrom(Other.Ambiguous); break;
580 case EllipsisConversion: break;
581 case BadConversion: Bad = Other.Bad; break;
582 }
583 }
584
585 ImplicitConversionSequence &
586 operator=(const ImplicitConversionSequence &Other) {
587 destruct();
588 new (this) ImplicitConversionSequence(Other);
589 return *this;
590 }
591
592 ~ImplicitConversionSequence() {
593 destruct();
594 }
595
596 Kind getKind() const {
597 assert(isInitialized() && "querying uninitialized conversion")((isInitialized() && "querying uninitialized conversion"
) ? static_cast<void> (0) : __assert_fail ("isInitialized() && \"querying uninitialized conversion\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/Sema/Overload.h"
, 597, __PRETTY_FUNCTION__))
;
598 return Kind(ConversionKind);
599 }
600
601 /// Return a ranking of the implicit conversion sequence
602 /// kind, where smaller ranks represent better conversion
603 /// sequences.
604 ///
605 /// In particular, this routine gives user-defined conversion
606 /// sequences and ambiguous conversion sequences the same rank,
607 /// per C++ [over.best.ics]p10.
608 unsigned getKindRank() const {
609 switch (getKind()) {
610 case StandardConversion:
611 return 0;
612
613 case UserDefinedConversion:
614 case AmbiguousConversion:
615 return 1;
616
617 case EllipsisConversion:
618 return 2;
619
620 case BadConversion:
621 return 3;
622 }
623
624 llvm_unreachable("Invalid ImplicitConversionSequence::Kind!")::llvm::llvm_unreachable_internal("Invalid ImplicitConversionSequence::Kind!"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/Sema/Overload.h"
, 624)
;
625 }
626
627 bool isBad() const { return getKind() == BadConversion; }
62
Assuming the condition is true
63
Returning the value 1, which participates in a condition later
628 bool isStandard() const { return getKind() == StandardConversion; }
58
Assuming the condition is false
59
Returning zero, which participates in a condition later
629 bool isEllipsis() const { return getKind() == EllipsisConversion; }
630 bool isAmbiguous() const { return getKind() == AmbiguousConversion; }
631 bool isUserDefined() const { return getKind() == UserDefinedConversion; }
632 bool isFailure() const { return isBad() || isAmbiguous(); }
633
634 /// Determines whether this conversion sequence has been
635 /// initialized. Most operations should never need to query
636 /// uninitialized conversions and should assert as above.
637 bool isInitialized() const { return ConversionKind != Uninitialized; }
638
639 /// Sets this sequence as a bad conversion for an explicit argument.
640 void setBad(BadConversionSequence::FailureKind Failure,
641 Expr *FromExpr, QualType ToType) {
642 setKind(BadConversion);
643 Bad.init(Failure, FromExpr, ToType);
644 }
645
646 /// Sets this sequence as a bad conversion for an implicit argument.
647 void setBad(BadConversionSequence::FailureKind Failure,
648 QualType FromType, QualType ToType) {
649 setKind(BadConversion);
650 Bad.init(Failure, FromType, ToType);
651 }
652
653 void setStandard() { setKind(StandardConversion); }
654 void setEllipsis() { setKind(EllipsisConversion); }
655 void setUserDefined() { setKind(UserDefinedConversion); }
656
657 void setAmbiguous() {
658 if (ConversionKind == AmbiguousConversion) return;
659 ConversionKind = AmbiguousConversion;
660 Ambiguous.construct();
661 }
662
663 void setAsIdentityConversion(QualType T) {
664 setStandard();
665 Standard.setAsIdentityConversion();
666 Standard.setFromType(T);
667 Standard.setAllToTypes(T);
668 }
669
670 /// Whether the target is really a std::initializer_list, and the
671 /// sequence only represents the worst element conversion.
672 bool isStdInitializerListElement() const {
673 return StdInitializerListElement;
674 }
675
676 void setStdInitializerListElement(bool V = true) {
677 StdInitializerListElement = V;
678 }
679
680 // The result of a comparison between implicit conversion
681 // sequences. Use Sema::CompareImplicitConversionSequences to
682 // actually perform the comparison.
683 enum CompareKind {
684 Better = -1,
685 Indistinguishable = 0,
686 Worse = 1
687 };
688
689 void DiagnoseAmbiguousConversion(Sema &S,
690 SourceLocation CaretLoc,
691 const PartialDiagnostic &PDiag) const;
692
693 void dump() const;
694 };
695
696 enum OverloadFailureKind {
697 ovl_fail_too_many_arguments,
698 ovl_fail_too_few_arguments,
699 ovl_fail_bad_conversion,
700 ovl_fail_bad_deduction,
701
702 /// This conversion candidate was not considered because it
703 /// duplicates the work of a trivial or derived-to-base
704 /// conversion.
705 ovl_fail_trivial_conversion,
706
707 /// This conversion candidate was not considered because it is
708 /// an illegal instantiation of a constructor temploid: it is
709 /// callable with one argument, we only have one argument, and
710 /// its first parameter type is exactly the type of the class.
711 ///
712 /// Defining such a constructor directly is illegal, and
713 /// template-argument deduction is supposed to ignore such
714 /// instantiations, but we can still get one with the right
715 /// kind of implicit instantiation.
716 ovl_fail_illegal_constructor,
717
718 /// This conversion candidate is not viable because its result
719 /// type is not implicitly convertible to the desired type.
720 ovl_fail_bad_final_conversion,
721
722 /// This conversion function template specialization candidate is not
723 /// viable because the final conversion was not an exact match.
724 ovl_fail_final_conversion_not_exact,
725
726 /// (CUDA) This candidate was not viable because the callee
727 /// was not accessible from the caller's target (i.e. host->device,
728 /// global->host, device->host).
729 ovl_fail_bad_target,
730
731 /// This candidate function was not viable because an enable_if
732 /// attribute disabled it.
733 ovl_fail_enable_if,
734
735 /// This candidate constructor or conversion function is explicit but
736 /// the context doesn't permit explicit functions.
737 ovl_fail_explicit,
738
739 /// This candidate was not viable because its address could not be taken.
740 ovl_fail_addr_not_available,
741
742 /// This candidate was not viable because its OpenCL extension is disabled.
743 ovl_fail_ext_disabled,
744
745 /// This inherited constructor is not viable because it would slice the
746 /// argument.
747 ovl_fail_inhctor_slice,
748
749 /// This candidate was not viable because it is a non-default multiversioned
750 /// function.
751 ovl_non_default_multiversion_function,
752
753 /// This constructor/conversion candidate fail due to an address space
754 /// mismatch between the object being constructed and the overload
755 /// candidate.
756 ovl_fail_object_addrspace_mismatch,
757
758 /// This candidate was not viable because its associated constraints were
759 /// not satisfied.
760 ovl_fail_constraints_not_satisfied,
761 };
762
763 /// A list of implicit conversion sequences for the arguments of an
764 /// OverloadCandidate.
765 using ConversionSequenceList =
766 llvm::MutableArrayRef<ImplicitConversionSequence>;
767
768 /// OverloadCandidate - A single candidate in an overload set (C++ 13.3).
769 struct OverloadCandidate {
770 /// Function - The actual function that this candidate
771 /// represents. When NULL, this is a built-in candidate
772 /// (C++ [over.oper]) or a surrogate for a conversion to a
773 /// function pointer or reference (C++ [over.call.object]).
774 FunctionDecl *Function;
775
776 /// FoundDecl - The original declaration that was looked up /
777 /// invented / otherwise found, together with its access.
778 /// Might be a UsingShadowDecl or a FunctionTemplateDecl.
779 DeclAccessPair FoundDecl;
780
781 /// BuiltinParamTypes - Provides the parameter types of a built-in overload
782 /// candidate. Only valid when Function is NULL.
783 QualType BuiltinParamTypes[3];
784
785 /// Surrogate - The conversion function for which this candidate
786 /// is a surrogate, but only if IsSurrogate is true.
787 CXXConversionDecl *Surrogate;
788
789 /// The conversion sequences used to convert the function arguments
790 /// to the function parameters. Note that these are indexed by argument,
791 /// so may not match the parameter order of Function.
792 ConversionSequenceList Conversions;
793
794 /// The FixIt hints which can be used to fix the Bad candidate.
795 ConversionFixItGenerator Fix;
796
797 /// Viable - True to indicate that this overload candidate is viable.
798 bool Viable : 1;
799
800 /// Whether this candidate is the best viable function, or tied for being
801 /// the best viable function.
802 ///
803 /// For an ambiguous overload resolution, indicates whether this candidate
804 /// was part of the ambiguity kernel: the minimal non-empty set of viable
805 /// candidates such that all elements of the ambiguity kernel are better
806 /// than all viable candidates not in the ambiguity kernel.
807 bool Best : 1;
808
809 /// IsSurrogate - True to indicate that this candidate is a
810 /// surrogate for a conversion to a function pointer or reference
811 /// (C++ [over.call.object]).
812 bool IsSurrogate : 1;
813
814 /// IgnoreObjectArgument - True to indicate that the first
815 /// argument's conversion, which for this function represents the
816 /// implicit object argument, should be ignored. This will be true
817 /// when the candidate is a static member function (where the
818 /// implicit object argument is just a placeholder) or a
819 /// non-static member function when the call doesn't have an
820 /// object argument.
821 bool IgnoreObjectArgument : 1;
822
823 /// True if the candidate was found using ADL.
824 CallExpr::ADLCallKind IsADLCandidate : 1;
825
826 /// Whether this is a rewritten candidate, and if so, of what kind?
827 unsigned RewriteKind : 2;
828
829 /// FailureKind - The reason why this candidate is not viable.
830 /// Actually an OverloadFailureKind.
831 unsigned char FailureKind;
832
833 /// The number of call arguments that were explicitly provided,
834 /// to be used while performing partial ordering of function templates.
835 unsigned ExplicitCallArguments;
836
837 union {
838 DeductionFailureInfo DeductionFailure;
839
840 /// FinalConversion - For a conversion function (where Function is
841 /// a CXXConversionDecl), the standard conversion that occurs
842 /// after the call to the overload candidate to convert the result
843 /// of calling the conversion function to the required type.
844 StandardConversionSequence FinalConversion;
845 };
846
847 /// Get RewriteKind value in OverloadCandidateRewriteKind type (This
848 /// function is to workaround the spurious GCC bitfield enum warning)
849 OverloadCandidateRewriteKind getRewriteKind() const {
850 return static_cast<OverloadCandidateRewriteKind>(RewriteKind);
851 }
852
853 /// hasAmbiguousConversion - Returns whether this overload
854 /// candidate requires an ambiguous conversion or not.
855 bool hasAmbiguousConversion() const {
856 for (auto &C : Conversions) {
857 if (!C.isInitialized()) return false;
858 if (C.isAmbiguous()) return true;
859 }
860 return false;
861 }
862
863 bool TryToFixBadConversion(unsigned Idx, Sema &S) {
864 bool CanFix = Fix.tryToFixConversion(
865 Conversions[Idx].Bad.FromExpr,
866 Conversions[Idx].Bad.getFromType(),
867 Conversions[Idx].Bad.getToType(), S);
868
869 // If at least one conversion fails, the candidate cannot be fixed.
870 if (!CanFix)
871 Fix.clear();
872
873 return CanFix;
874 }
875
876 unsigned getNumParams() const {
877 if (IsSurrogate) {
878 QualType STy = Surrogate->getConversionType();
879 while (STy->isPointerType() || STy->isReferenceType())
880 STy = STy->getPointeeType();
881 return STy->castAs<FunctionProtoType>()->getNumParams();
882 }
883 if (Function)
884 return Function->getNumParams();
885 return ExplicitCallArguments;
886 }
887
888 private:
889 friend class OverloadCandidateSet;
890 OverloadCandidate()
891 : IsADLCandidate(CallExpr::NotADL), RewriteKind(CRK_None) {}
892 };
893
894 /// OverloadCandidateSet - A set of overload candidates, used in C++
895 /// overload resolution (C++ 13.3).
896 class OverloadCandidateSet {
897 public:
898 enum CandidateSetKind {
899 /// Normal lookup.
900 CSK_Normal,
901
902 /// C++ [over.match.oper]:
903 /// Lookup of operator function candidates in a call using operator
904 /// syntax. Candidates that have no parameters of class type will be
905 /// skipped unless there is a parameter of (reference to) enum type and
906 /// the corresponding argument is of the same enum type.
907 CSK_Operator,
908
909 /// C++ [over.match.copy]:
910 /// Copy-initialization of an object of class type by user-defined
911 /// conversion.
912 CSK_InitByUserDefinedConversion,
913
914 /// C++ [over.match.ctor], [over.match.list]
915 /// Initialization of an object of class type by constructor,
916 /// using either a parenthesized or braced list of arguments.
917 CSK_InitByConstructor,
918 };
919
920 /// Information about operator rewrites to consider when adding operator
921 /// functions to a candidate set.
922 struct OperatorRewriteInfo {
923 OperatorRewriteInfo()
924 : OriginalOperator(OO_None), AllowRewrittenCandidates(false) {}
925 OperatorRewriteInfo(OverloadedOperatorKind Op, bool AllowRewritten)
926 : OriginalOperator(Op), AllowRewrittenCandidates(AllowRewritten) {}
927
928 /// The original operator as written in the source.
929 OverloadedOperatorKind OriginalOperator;
930 /// Whether we should include rewritten candidates in the overload set.
931 bool AllowRewrittenCandidates;
932
933 /// Would use of this function result in a rewrite using a different
934 /// operator?
935 bool isRewrittenOperator(const FunctionDecl *FD) {
936 return OriginalOperator &&
937 FD->getDeclName().getCXXOverloadedOperator() != OriginalOperator;
938 }
939
940 bool isAcceptableCandidate(const FunctionDecl *FD) {
941 if (!OriginalOperator)
942 return true;
943
944 // For an overloaded operator, we can have candidates with a different
945 // name in our unqualified lookup set. Make sure we only consider the
946 // ones we're supposed to.
947 OverloadedOperatorKind OO =
948 FD->getDeclName().getCXXOverloadedOperator();
949 return OO && (OO == OriginalOperator ||
950 (AllowRewrittenCandidates &&
951 OO == getRewrittenOverloadedOperator(OriginalOperator)));
952 }
953
954 /// Determine the kind of rewrite that should be performed for this
955 /// candidate.
956 OverloadCandidateRewriteKind
957 getRewriteKind(const FunctionDecl *FD, OverloadCandidateParamOrder PO) {
958 OverloadCandidateRewriteKind CRK = CRK_None;
959 if (isRewrittenOperator(FD))
960 CRK = OverloadCandidateRewriteKind(CRK | CRK_DifferentOperator);
961 if (PO == OverloadCandidateParamOrder::Reversed)
962 CRK = OverloadCandidateRewriteKind(CRK | CRK_Reversed);
963 return CRK;
964 }
965
966 /// Determine whether we should consider looking for and adding reversed
967 /// candidates for operator Op.
968 bool shouldAddReversed(OverloadedOperatorKind Op);
969
970 /// Determine whether we should add a rewritten candidate for \p FD with
971 /// reversed parameter order.
972 bool shouldAddReversed(ASTContext &Ctx, const FunctionDecl *FD);
973 };
974
975 private:
976 SmallVector<OverloadCandidate, 16> Candidates;
977 llvm::SmallPtrSet<uintptr_t, 16> Functions;
978
979 // Allocator for ConversionSequenceLists. We store the first few of these
980 // inline to avoid allocation for small sets.
981 llvm::BumpPtrAllocator SlabAllocator;
982
983 SourceLocation Loc;
984 CandidateSetKind Kind;
985 OperatorRewriteInfo RewriteInfo;
986
987 constexpr static unsigned NumInlineBytes =
988 24 * sizeof(ImplicitConversionSequence);
989 unsigned NumInlineBytesUsed = 0;
990 alignas(void *) char InlineSpace[NumInlineBytes];
991
992 // Address space of the object being constructed.
993 LangAS DestAS = LangAS::Default;
994
995 /// If we have space, allocates from inline storage. Otherwise, allocates
996 /// from the slab allocator.
997 /// FIXME: It would probably be nice to have a SmallBumpPtrAllocator
998 /// instead.
999 /// FIXME: Now that this only allocates ImplicitConversionSequences, do we
1000 /// want to un-generalize this?
1001 template <typename T>
1002 T *slabAllocate(unsigned N) {
1003 // It's simpler if this doesn't need to consider alignment.
1004 static_assert(alignof(T) == alignof(void *),
1005 "Only works for pointer-aligned types.");
1006 static_assert(std::is_trivial<T>::value ||
1007 std::is_same<ImplicitConversionSequence, T>::value,
1008 "Add destruction logic to OverloadCandidateSet::clear().");
1009
1010 unsigned NBytes = sizeof(T) * N;
1011 if (NBytes > NumInlineBytes - NumInlineBytesUsed)
1012 return SlabAllocator.Allocate<T>(N);
1013 char *FreeSpaceStart = InlineSpace + NumInlineBytesUsed;
1014 assert(uintptr_t(FreeSpaceStart) % alignof(void *) == 0 &&((uintptr_t(FreeSpaceStart) % alignof(void *) == 0 &&
"Misaligned storage!") ? static_cast<void> (0) : __assert_fail
("uintptr_t(FreeSpaceStart) % alignof(void *) == 0 && \"Misaligned storage!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/Sema/Overload.h"
, 1015, __PRETTY_FUNCTION__))
1015 "Misaligned storage!")((uintptr_t(FreeSpaceStart) % alignof(void *) == 0 &&
"Misaligned storage!") ? static_cast<void> (0) : __assert_fail
("uintptr_t(FreeSpaceStart) % alignof(void *) == 0 && \"Misaligned storage!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/Sema/Overload.h"
, 1015, __PRETTY_FUNCTION__))
;
1016
1017 NumInlineBytesUsed += NBytes;
1018 return reinterpret_cast<T *>(FreeSpaceStart);
1019 }
1020
1021 void destroyCandidates();
1022
1023 public:
1024 OverloadCandidateSet(SourceLocation Loc, CandidateSetKind CSK,
1025 OperatorRewriteInfo RewriteInfo = {})
1026 : Loc(Loc), Kind(CSK), RewriteInfo(RewriteInfo) {}
1027 OverloadCandidateSet(const OverloadCandidateSet &) = delete;
1028 OverloadCandidateSet &operator=(const OverloadCandidateSet &) = delete;
1029 ~OverloadCandidateSet() { destroyCandidates(); }
1030
1031 SourceLocation getLocation() const { return Loc; }
1032 CandidateSetKind getKind() const { return Kind; }
1033 OperatorRewriteInfo getRewriteInfo() const { return RewriteInfo; }
1034
1035 /// Determine when this overload candidate will be new to the
1036 /// overload set.
1037 bool isNewCandidate(Decl *F, OverloadCandidateParamOrder PO =
1038 OverloadCandidateParamOrder::Normal) {
1039 uintptr_t Key = reinterpret_cast<uintptr_t>(F->getCanonicalDecl());
1040 Key |= static_cast<uintptr_t>(PO);
1041 return Functions.insert(Key).second;
1042 }
1043
1044 /// Exclude a function from being considered by overload resolution.
1045 void exclude(Decl *F) {
1046 isNewCandidate(F, OverloadCandidateParamOrder::Normal);
1047 isNewCandidate(F, OverloadCandidateParamOrder::Reversed);
1048 }
1049
1050 /// Clear out all of the candidates.
1051 void clear(CandidateSetKind CSK);
1052
1053 using iterator = SmallVectorImpl<OverloadCandidate>::iterator;
1054
1055 iterator begin() { return Candidates.begin(); }
1056 iterator end() { return Candidates.end(); }
1057
1058 size_t size() const { return Candidates.size(); }
1059 bool empty() const { return Candidates.empty(); }
1060
1061 /// Allocate storage for conversion sequences for NumConversions
1062 /// conversions.
1063 ConversionSequenceList
1064 allocateConversionSequences(unsigned NumConversions) {
1065 ImplicitConversionSequence *Conversions =
1066 slabAllocate<ImplicitConversionSequence>(NumConversions);
1067
1068 // Construct the new objects.
1069 for (unsigned I = 0; I != NumConversions; ++I)
1070 new (&Conversions[I]) ImplicitConversionSequence();
1071
1072 return ConversionSequenceList(Conversions, NumConversions);
1073 }
1074
1075 /// Add a new candidate with NumConversions conversion sequence slots
1076 /// to the overload set.
1077 OverloadCandidate &addCandidate(unsigned NumConversions = 0,
1078 ConversionSequenceList Conversions = None) {
1079 assert((Conversions.empty() || Conversions.size() == NumConversions) &&(((Conversions.empty() || Conversions.size() == NumConversions
) && "preallocated conversion sequence has wrong length"
) ? static_cast<void> (0) : __assert_fail ("(Conversions.empty() || Conversions.size() == NumConversions) && \"preallocated conversion sequence has wrong length\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/Sema/Overload.h"
, 1080, __PRETTY_FUNCTION__))
1080 "preallocated conversion sequence has wrong length")(((Conversions.empty() || Conversions.size() == NumConversions
) && "preallocated conversion sequence has wrong length"
) ? static_cast<void> (0) : __assert_fail ("(Conversions.empty() || Conversions.size() == NumConversions) && \"preallocated conversion sequence has wrong length\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/Sema/Overload.h"
, 1080, __PRETTY_FUNCTION__))
;
1081
1082 Candidates.push_back(OverloadCandidate());
1083 OverloadCandidate &C = Candidates.back();
1084 C.Conversions = Conversions.empty()
1085 ? allocateConversionSequences(NumConversions)
1086 : Conversions;
1087 return C;
1088 }
1089
1090 /// Find the best viable function on this overload set, if it exists.
1091 OverloadingResult BestViableFunction(Sema &S, SourceLocation Loc,
1092 OverloadCandidateSet::iterator& Best);
1093
1094 SmallVector<OverloadCandidate *, 32> CompleteCandidates(
1095 Sema &S, OverloadCandidateDisplayKind OCD, ArrayRef<Expr *> Args,
1096 SourceLocation OpLoc = SourceLocation(),
1097 llvm::function_ref<bool(OverloadCandidate &)> Filter =
1098 [](OverloadCandidate &) { return true; });
1099
1100 void NoteCandidates(
1101 PartialDiagnosticAt PA, Sema &S, OverloadCandidateDisplayKind OCD,
1102 ArrayRef<Expr *> Args, StringRef Opc = "",
1103 SourceLocation Loc = SourceLocation(),
1104 llvm::function_ref<bool(OverloadCandidate &)> Filter =
1105 [](OverloadCandidate &) { return true; });
1106
1107 void NoteCandidates(Sema &S, ArrayRef<Expr *> Args,
1108 ArrayRef<OverloadCandidate *> Cands,
1109 StringRef Opc = "",
1110 SourceLocation OpLoc = SourceLocation());
1111
1112 LangAS getDestAS() { return DestAS; }
1113
1114 void setDestAS(LangAS AS) {
1115 assert((Kind == CSK_InitByConstructor ||(((Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion
) && "can't set the destination address space when not constructing an "
"object") ? static_cast<void> (0) : __assert_fail ("(Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion) && \"can't set the destination address space when not constructing an \" \"object\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/Sema/Overload.h"
, 1118, __PRETTY_FUNCTION__))
1116 Kind == CSK_InitByUserDefinedConversion) &&(((Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion
) && "can't set the destination address space when not constructing an "
"object") ? static_cast<void> (0) : __assert_fail ("(Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion) && \"can't set the destination address space when not constructing an \" \"object\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/Sema/Overload.h"
, 1118, __PRETTY_FUNCTION__))
1117 "can't set the destination address space when not constructing an "(((Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion
) && "can't set the destination address space when not constructing an "
"object") ? static_cast<void> (0) : __assert_fail ("(Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion) && \"can't set the destination address space when not constructing an \" \"object\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/Sema/Overload.h"
, 1118, __PRETTY_FUNCTION__))
1118 "object")(((Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion
) && "can't set the destination address space when not constructing an "
"object") ? static_cast<void> (0) : __assert_fail ("(Kind == CSK_InitByConstructor || Kind == CSK_InitByUserDefinedConversion) && \"can't set the destination address space when not constructing an \" \"object\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include/clang/Sema/Overload.h"
, 1118, __PRETTY_FUNCTION__))
;
1119 DestAS = AS;
1120 }
1121
1122 };
1123
1124 bool isBetterOverloadCandidate(Sema &S,
1125 const OverloadCandidate &Cand1,
1126 const OverloadCandidate &Cand2,
1127 SourceLocation Loc,
1128 OverloadCandidateSet::CandidateSetKind Kind);
1129
1130 struct ConstructorInfo {
1131 DeclAccessPair FoundDecl;
1132 CXXConstructorDecl *Constructor;
1133 FunctionTemplateDecl *ConstructorTmpl;
1134
1135 explicit operator bool() const { return Constructor; }
1136 };
1137
1138 // FIXME: Add an AddOverloadCandidate / AddTemplateOverloadCandidate overload
1139 // that takes one of these.
1140 inline ConstructorInfo getConstructorInfo(NamedDecl *ND) {
1141 if (isa<UsingDecl>(ND))
1142 return ConstructorInfo{};
1143
1144 // For constructors, the access check is performed against the underlying
1145 // declaration, not the found declaration.
1146 auto *D = ND->getUnderlyingDecl();
1147 ConstructorInfo Info = {DeclAccessPair::make(ND, D->getAccess()), nullptr,
1148 nullptr};
1149 Info.ConstructorTmpl = dyn_cast<FunctionTemplateDecl>(D);
1150 if (Info.ConstructorTmpl)
1151 D = Info.ConstructorTmpl->getTemplatedDecl();
1152 Info.Constructor = dyn_cast<CXXConstructorDecl>(D);
1153 return Info;
1154 }
1155
1156} // namespace clang
1157
1158#endif // LLVM_CLANG_SEMA_OVERLOAD_H