| File: | tools/clang/lib/Sema/SemaInit.cpp |
| Warning: | line 5167, column 9 Called C++ object pointer is null |
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| 1 | //===--- SemaInit.cpp - Semantic Analysis for Initializers ----------------===// | |||
| 2 | // | |||
| 3 | // The LLVM Compiler Infrastructure | |||
| 4 | // | |||
| 5 | // This file is distributed under the University of Illinois Open Source | |||
| 6 | // License. See LICENSE.TXT for details. | |||
| 7 | // | |||
| 8 | //===----------------------------------------------------------------------===// | |||
| 9 | // | |||
| 10 | // This file implements semantic analysis for initializers. | |||
| 11 | // | |||
| 12 | //===----------------------------------------------------------------------===// | |||
| 13 | ||||
| 14 | #include "clang/AST/ASTContext.h" | |||
| 15 | #include "clang/AST/DeclObjC.h" | |||
| 16 | #include "clang/AST/ExprCXX.h" | |||
| 17 | #include "clang/AST/ExprObjC.h" | |||
| 18 | #include "clang/AST/ExprOpenMP.h" | |||
| 19 | #include "clang/AST/TypeLoc.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 | ||||
| 30 | using 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). | |||
| 38 | static 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 | ||||
| 48 | enum 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. | |||
| 62 | static 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[[clang::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-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 132); | |||
| 133 | } | |||
| 134 | ||||
| 135 | static 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. | |||
| 145 | static void updateStringLiteralType(Expr *E, QualType Ty) { | |||
| 146 | while (true) { | |||
| 147 | E->setType(Ty); | |||
| 148 | if (isa<StringLiteral>(E) || isa<ObjCEncodeExpr>(E)) | |||
| 149 | break; | |||
| 150 | else if (ParenExpr *PE = dyn_cast<ParenExpr>(E)) | |||
| 151 | E = PE->getSubExpr(); | |||
| 152 | else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) | |||
| 153 | E = UO->getSubExpr(); | |||
| 154 | else if (GenericSelectionExpr *GSE = dyn_cast<GenericSelectionExpr>(E)) | |||
| 155 | E = GSE->getResultExpr(); | |||
| 156 | else | |||
| 157 | llvm_unreachable("unexpected expr in string literal init")::llvm::llvm_unreachable_internal("unexpected expr in string literal init" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 157); | |||
| 158 | } | |||
| 159 | } | |||
| 160 | ||||
| 161 | static void CheckStringInit(Expr *Str, QualType &DeclT, const ArrayType *AT, | |||
| 162 | Sema &S) { | |||
| 163 | // Get the length of the string as parsed. | |||
| 164 | auto *ConstantArrayTy = | |||
| 165 | cast<ConstantArrayType>(Str->getType()->getAsArrayTypeUnsafe()); | |||
| 166 | uint64_t StrLength = ConstantArrayTy->getSize().getZExtValue(); | |||
| 167 | ||||
| 168 | if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { | |||
| 169 | // C99 6.7.8p14. We have an array of character type with unknown size | |||
| 170 | // being initialized to a string literal. | |||
| 171 | llvm::APInt ConstVal(32, StrLength); | |||
| 172 | // Return a new array type (C99 6.7.8p22). | |||
| 173 | DeclT = S.Context.getConstantArrayType(IAT->getElementType(), | |||
| 174 | ConstVal, | |||
| 175 | ArrayType::Normal, 0); | |||
| 176 | updateStringLiteralType(Str, DeclT); | |||
| 177 | return; | |||
| 178 | } | |||
| 179 | ||||
| 180 | const ConstantArrayType *CAT = cast<ConstantArrayType>(AT); | |||
| 181 | ||||
| 182 | // We have an array of character type with known size. However, | |||
| 183 | // the size may be smaller or larger than the string we are initializing. | |||
| 184 | // FIXME: Avoid truncation for 64-bit length strings. | |||
| 185 | if (S.getLangOpts().CPlusPlus) { | |||
| 186 | if (StringLiteral *SL = dyn_cast<StringLiteral>(Str->IgnoreParens())) { | |||
| 187 | // For Pascal strings it's OK to strip off the terminating null character, | |||
| 188 | // so the example below is valid: | |||
| 189 | // | |||
| 190 | // unsigned char a[2] = "\pa"; | |||
| 191 | if (SL->isPascal()) | |||
| 192 | StrLength--; | |||
| 193 | } | |||
| 194 | ||||
| 195 | // [dcl.init.string]p2 | |||
| 196 | if (StrLength > CAT->getSize().getZExtValue()) | |||
| 197 | S.Diag(Str->getLocStart(), | |||
| 198 | diag::err_initializer_string_for_char_array_too_long) | |||
| 199 | << Str->getSourceRange(); | |||
| 200 | } else { | |||
| 201 | // C99 6.7.8p14. | |||
| 202 | if (StrLength-1 > CAT->getSize().getZExtValue()) | |||
| 203 | S.Diag(Str->getLocStart(), | |||
| 204 | diag::ext_initializer_string_for_char_array_too_long) | |||
| 205 | << Str->getSourceRange(); | |||
| 206 | } | |||
| 207 | ||||
| 208 | // Set the type to the actual size that we are initializing. If we have | |||
| 209 | // something like: | |||
| 210 | // char x[1] = "foo"; | |||
| 211 | // then this will set the string literal's type to char[1]. | |||
| 212 | updateStringLiteralType(Str, DeclT); | |||
| 213 | } | |||
| 214 | ||||
| 215 | //===----------------------------------------------------------------------===// | |||
| 216 | // Semantic checking for initializer lists. | |||
| 217 | //===----------------------------------------------------------------------===// | |||
| 218 | ||||
| 219 | namespace { | |||
| 220 | ||||
| 221 | /// Semantic checking for initializer lists. | |||
| 222 | /// | |||
| 223 | /// The InitListChecker class contains a set of routines that each | |||
| 224 | /// handle the initialization of a certain kind of entity, e.g., | |||
| 225 | /// arrays, vectors, struct/union types, scalars, etc. The | |||
| 226 | /// InitListChecker itself performs a recursive walk of the subobject | |||
| 227 | /// structure of the type to be initialized, while stepping through | |||
| 228 | /// the initializer list one element at a time. The IList and Index | |||
| 229 | /// parameters to each of the Check* routines contain the active | |||
| 230 | /// (syntactic) initializer list and the index into that initializer | |||
| 231 | /// list that represents the current initializer. Each routine is | |||
| 232 | /// responsible for moving that Index forward as it consumes elements. | |||
| 233 | /// | |||
| 234 | /// Each Check* routine also has a StructuredList/StructuredIndex | |||
| 235 | /// arguments, which contains the current "structured" (semantic) | |||
| 236 | /// initializer list and the index into that initializer list where we | |||
| 237 | /// are copying initializers as we map them over to the semantic | |||
| 238 | /// list. Once we have completed our recursive walk of the subobject | |||
| 239 | /// structure, we will have constructed a full semantic initializer | |||
| 240 | /// list. | |||
| 241 | /// | |||
| 242 | /// C99 designators cause changes in the initializer list traversal, | |||
| 243 | /// because they make the initialization "jump" into a specific | |||
| 244 | /// subobject and then continue the initialization from that | |||
| 245 | /// point. CheckDesignatedInitializer() recursively steps into the | |||
| 246 | /// designated subobject and manages backing out the recursion to | |||
| 247 | /// initialize the subobjects after the one designated. | |||
| 248 | class InitListChecker { | |||
| 249 | Sema &SemaRef; | |||
| 250 | bool hadError; | |||
| 251 | bool VerifyOnly; // no diagnostics, no structure building | |||
| 252 | bool TreatUnavailableAsInvalid; // Used only in VerifyOnly mode. | |||
| 253 | llvm::DenseMap<InitListExpr *, InitListExpr *> SyntacticToSemantic; | |||
| 254 | InitListExpr *FullyStructuredList; | |||
| 255 | ||||
| 256 | void CheckImplicitInitList(const InitializedEntity &Entity, | |||
| 257 | InitListExpr *ParentIList, QualType T, | |||
| 258 | unsigned &Index, InitListExpr *StructuredList, | |||
| 259 | unsigned &StructuredIndex); | |||
| 260 | void CheckExplicitInitList(const InitializedEntity &Entity, | |||
| 261 | InitListExpr *IList, QualType &T, | |||
| 262 | InitListExpr *StructuredList, | |||
| 263 | bool TopLevelObject = false); | |||
| 264 | void CheckListElementTypes(const InitializedEntity &Entity, | |||
| 265 | InitListExpr *IList, QualType &DeclType, | |||
| 266 | bool SubobjectIsDesignatorContext, | |||
| 267 | unsigned &Index, | |||
| 268 | InitListExpr *StructuredList, | |||
| 269 | unsigned &StructuredIndex, | |||
| 270 | bool TopLevelObject = false); | |||
| 271 | void CheckSubElementType(const InitializedEntity &Entity, | |||
| 272 | InitListExpr *IList, QualType ElemType, | |||
| 273 | unsigned &Index, | |||
| 274 | InitListExpr *StructuredList, | |||
| 275 | unsigned &StructuredIndex); | |||
| 276 | void CheckComplexType(const InitializedEntity &Entity, | |||
| 277 | InitListExpr *IList, QualType DeclType, | |||
| 278 | unsigned &Index, | |||
| 279 | InitListExpr *StructuredList, | |||
| 280 | unsigned &StructuredIndex); | |||
| 281 | void CheckScalarType(const InitializedEntity &Entity, | |||
| 282 | InitListExpr *IList, QualType DeclType, | |||
| 283 | unsigned &Index, | |||
| 284 | InitListExpr *StructuredList, | |||
| 285 | unsigned &StructuredIndex); | |||
| 286 | void CheckReferenceType(const InitializedEntity &Entity, | |||
| 287 | InitListExpr *IList, QualType DeclType, | |||
| 288 | unsigned &Index, | |||
| 289 | InitListExpr *StructuredList, | |||
| 290 | unsigned &StructuredIndex); | |||
| 291 | void CheckVectorType(const InitializedEntity &Entity, | |||
| 292 | InitListExpr *IList, QualType DeclType, unsigned &Index, | |||
| 293 | InitListExpr *StructuredList, | |||
| 294 | unsigned &StructuredIndex); | |||
| 295 | void CheckStructUnionTypes(const InitializedEntity &Entity, | |||
| 296 | InitListExpr *IList, QualType DeclType, | |||
| 297 | CXXRecordDecl::base_class_range Bases, | |||
| 298 | RecordDecl::field_iterator Field, | |||
| 299 | bool SubobjectIsDesignatorContext, unsigned &Index, | |||
| 300 | InitListExpr *StructuredList, | |||
| 301 | unsigned &StructuredIndex, | |||
| 302 | bool TopLevelObject = false); | |||
| 303 | void CheckArrayType(const InitializedEntity &Entity, | |||
| 304 | InitListExpr *IList, QualType &DeclType, | |||
| 305 | llvm::APSInt elementIndex, | |||
| 306 | bool SubobjectIsDesignatorContext, unsigned &Index, | |||
| 307 | InitListExpr *StructuredList, | |||
| 308 | unsigned &StructuredIndex); | |||
| 309 | bool CheckDesignatedInitializer(const InitializedEntity &Entity, | |||
| 310 | InitListExpr *IList, DesignatedInitExpr *DIE, | |||
| 311 | unsigned DesigIdx, | |||
| 312 | QualType &CurrentObjectType, | |||
| 313 | RecordDecl::field_iterator *NextField, | |||
| 314 | llvm::APSInt *NextElementIndex, | |||
| 315 | unsigned &Index, | |||
| 316 | InitListExpr *StructuredList, | |||
| 317 | unsigned &StructuredIndex, | |||
| 318 | bool FinishSubobjectInit, | |||
| 319 | bool TopLevelObject); | |||
| 320 | InitListExpr *getStructuredSubobjectInit(InitListExpr *IList, unsigned Index, | |||
| 321 | QualType CurrentObjectType, | |||
| 322 | InitListExpr *StructuredList, | |||
| 323 | unsigned StructuredIndex, | |||
| 324 | SourceRange InitRange, | |||
| 325 | bool IsFullyOverwritten = false); | |||
| 326 | void UpdateStructuredListElement(InitListExpr *StructuredList, | |||
| 327 | unsigned &StructuredIndex, | |||
| 328 | Expr *expr); | |||
| 329 | int numArrayElements(QualType DeclType); | |||
| 330 | int numStructUnionElements(QualType DeclType); | |||
| 331 | ||||
| 332 | static ExprResult PerformEmptyInit(Sema &SemaRef, | |||
| 333 | SourceLocation Loc, | |||
| 334 | const InitializedEntity &Entity, | |||
| 335 | bool VerifyOnly, | |||
| 336 | bool TreatUnavailableAsInvalid); | |||
| 337 | ||||
| 338 | // Explanation on the "FillWithNoInit" mode: | |||
| 339 | // | |||
| 340 | // Assume we have the following definitions (Case#1): | |||
| 341 | // struct P { char x[6][6]; } xp = { .x[1] = "bar" }; | |||
| 342 | // struct PP { struct P lp; } l = { .lp = xp, .lp.x[1][2] = 'f' }; | |||
| 343 | // | |||
| 344 | // l.lp.x[1][0..1] should not be filled with implicit initializers because the | |||
| 345 | // "base" initializer "xp" will provide values for them; l.lp.x[1] will be "baf". | |||
| 346 | // | |||
| 347 | // But if we have (Case#2): | |||
| 348 | // struct PP l = { .lp = xp, .lp.x[1] = { [2] = 'f' } }; | |||
| 349 | // | |||
| 350 | // l.lp.x[1][0..1] are implicitly initialized and do not use values from the | |||
| 351 | // "base" initializer; l.lp.x[1] will be "\0\0f\0\0\0". | |||
| 352 | // | |||
| 353 | // To distinguish Case#1 from Case#2, and also to avoid leaving many "holes" | |||
| 354 | // in the InitListExpr, the "holes" in Case#1 are filled not with empty | |||
| 355 | // initializers but with special "NoInitExpr" place holders, which tells the | |||
| 356 | // CodeGen not to generate any initializers for these parts. | |||
| 357 | void FillInEmptyInitForBase(unsigned Init, const CXXBaseSpecifier &Base, | |||
| 358 | const InitializedEntity &ParentEntity, | |||
| 359 | InitListExpr *ILE, bool &RequiresSecondPass, | |||
| 360 | bool FillWithNoInit); | |||
| 361 | void FillInEmptyInitForField(unsigned Init, FieldDecl *Field, | |||
| 362 | const InitializedEntity &ParentEntity, | |||
| 363 | InitListExpr *ILE, bool &RequiresSecondPass, | |||
| 364 | bool FillWithNoInit = false); | |||
| 365 | void FillInEmptyInitializations(const InitializedEntity &Entity, | |||
| 366 | InitListExpr *ILE, bool &RequiresSecondPass, | |||
| 367 | InitListExpr *OuterILE, unsigned OuterIndex, | |||
| 368 | bool FillWithNoInit = false); | |||
| 369 | bool CheckFlexibleArrayInit(const InitializedEntity &Entity, | |||
| 370 | Expr *InitExpr, FieldDecl *Field, | |||
| 371 | bool TopLevelObject); | |||
| 372 | void CheckEmptyInitializable(const InitializedEntity &Entity, | |||
| 373 | SourceLocation Loc); | |||
| 374 | ||||
| 375 | public: | |||
| 376 | InitListChecker(Sema &S, const InitializedEntity &Entity, | |||
| 377 | InitListExpr *IL, QualType &T, bool VerifyOnly, | |||
| 378 | bool TreatUnavailableAsInvalid); | |||
| 379 | bool HadError() { return hadError; } | |||
| 380 | ||||
| 381 | // Retrieves the fully-structured initializer list used for | |||
| 382 | // semantic analysis and code generation. | |||
| 383 | InitListExpr *getFullyStructuredList() const { return FullyStructuredList; } | |||
| 384 | }; | |||
| 385 | ||||
| 386 | } // end anonymous namespace | |||
| 387 | ||||
| 388 | ExprResult InitListChecker::PerformEmptyInit(Sema &SemaRef, | |||
| 389 | SourceLocation Loc, | |||
| 390 | const InitializedEntity &Entity, | |||
| 391 | bool VerifyOnly, | |||
| 392 | bool TreatUnavailableAsInvalid) { | |||
| 393 | InitializationKind Kind = InitializationKind::CreateValue(Loc, Loc, Loc, | |||
| 394 | true); | |||
| 395 | MultiExprArg SubInit; | |||
| 396 | Expr *InitExpr; | |||
| 397 | InitListExpr DummyInitList(SemaRef.Context, Loc, None, Loc); | |||
| 398 | ||||
| 399 | // C++ [dcl.init.aggr]p7: | |||
| 400 | // If there are fewer initializer-clauses in the list than there are | |||
| 401 | // members in the aggregate, then each member not explicitly initialized | |||
| 402 | // ... | |||
| 403 | bool EmptyInitList = SemaRef.getLangOpts().CPlusPlus11 && | |||
| 404 | Entity.getType()->getBaseElementTypeUnsafe()->isRecordType(); | |||
| 405 | if (EmptyInitList) { | |||
| 406 | // C++1y / DR1070: | |||
| 407 | // shall be initialized [...] from an empty initializer list. | |||
| 408 | // | |||
| 409 | // We apply the resolution of this DR to C++11 but not C++98, since C++98 | |||
| 410 | // does not have useful semantics for initialization from an init list. | |||
| 411 | // We treat this as copy-initialization, because aggregate initialization | |||
| 412 | // always performs copy-initialization on its elements. | |||
| 413 | // | |||
| 414 | // Only do this if we're initializing a class type, to avoid filling in | |||
| 415 | // the initializer list where possible. | |||
| 416 | InitExpr = VerifyOnly ? &DummyInitList : new (SemaRef.Context) | |||
| 417 | InitListExpr(SemaRef.Context, Loc, None, Loc); | |||
| 418 | InitExpr->setType(SemaRef.Context.VoidTy); | |||
| 419 | SubInit = InitExpr; | |||
| 420 | Kind = InitializationKind::CreateCopy(Loc, Loc); | |||
| 421 | } else { | |||
| 422 | // C++03: | |||
| 423 | // shall be value-initialized. | |||
| 424 | } | |||
| 425 | ||||
| 426 | InitializationSequence InitSeq(SemaRef, Entity, Kind, SubInit); | |||
| 427 | // libstdc++4.6 marks the vector default constructor as explicit in | |||
| 428 | // _GLIBCXX_DEBUG mode, so recover using the C++03 logic in that case. | |||
| 429 | // stlport does so too. Look for std::__debug for libstdc++, and for | |||
| 430 | // std:: for stlport. This is effectively a compiler-side implementation of | |||
| 431 | // LWG2193. | |||
| 432 | if (!InitSeq && EmptyInitList && InitSeq.getFailureKind() == | |||
| 433 | InitializationSequence::FK_ExplicitConstructor) { | |||
| 434 | OverloadCandidateSet::iterator Best; | |||
| 435 | OverloadingResult O = | |||
| 436 | InitSeq.getFailedCandidateSet() | |||
| 437 | .BestViableFunction(SemaRef, Kind.getLocation(), Best); | |||
| 438 | (void)O; | |||
| 439 | assert(O == OR_Success && "Inconsistent overload resolution")(static_cast <bool> (O == OR_Success && "Inconsistent overload resolution" ) ? void (0) : __assert_fail ("O == OR_Success && \"Inconsistent overload resolution\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 439, __extension__ __PRETTY_FUNCTION__)); | |||
| 440 | CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function); | |||
| 441 | CXXRecordDecl *R = CtorDecl->getParent(); | |||
| 442 | ||||
| 443 | if (CtorDecl->getMinRequiredArguments() == 0 && | |||
| 444 | CtorDecl->isExplicit() && R->getDeclName() && | |||
| 445 | SemaRef.SourceMgr.isInSystemHeader(CtorDecl->getLocation())) { | |||
| 446 | bool IsInStd = false; | |||
| 447 | for (NamespaceDecl *ND = dyn_cast<NamespaceDecl>(R->getDeclContext()); | |||
| 448 | ND && !IsInStd; ND = dyn_cast<NamespaceDecl>(ND->getParent())) { | |||
| 449 | if (SemaRef.getStdNamespace()->InEnclosingNamespaceSetOf(ND)) | |||
| 450 | IsInStd = true; | |||
| 451 | } | |||
| 452 | ||||
| 453 | if (IsInStd && llvm::StringSwitch<bool>(R->getName()) | |||
| 454 | .Cases("basic_string", "deque", "forward_list", true) | |||
| 455 | .Cases("list", "map", "multimap", "multiset", true) | |||
| 456 | .Cases("priority_queue", "queue", "set", "stack", true) | |||
| 457 | .Cases("unordered_map", "unordered_set", "vector", true) | |||
| 458 | .Default(false)) { | |||
| 459 | InitSeq.InitializeFrom( | |||
| 460 | SemaRef, Entity, | |||
| 461 | InitializationKind::CreateValue(Loc, Loc, Loc, true), | |||
| 462 | MultiExprArg(), /*TopLevelOfInitList=*/false, | |||
| 463 | TreatUnavailableAsInvalid); | |||
| 464 | // Emit a warning for this. System header warnings aren't shown | |||
| 465 | // by default, but people working on system headers should see it. | |||
| 466 | if (!VerifyOnly) { | |||
| 467 | SemaRef.Diag(CtorDecl->getLocation(), | |||
| 468 | diag::warn_invalid_initializer_from_system_header); | |||
| 469 | if (Entity.getKind() == InitializedEntity::EK_Member) | |||
| 470 | SemaRef.Diag(Entity.getDecl()->getLocation(), | |||
| 471 | diag::note_used_in_initialization_here); | |||
| 472 | else if (Entity.getKind() == InitializedEntity::EK_ArrayElement) | |||
| 473 | SemaRef.Diag(Loc, diag::note_used_in_initialization_here); | |||
| 474 | } | |||
| 475 | } | |||
| 476 | } | |||
| 477 | } | |||
| 478 | if (!InitSeq) { | |||
| 479 | if (!VerifyOnly) { | |||
| 480 | InitSeq.Diagnose(SemaRef, Entity, Kind, SubInit); | |||
| 481 | if (Entity.getKind() == InitializedEntity::EK_Member) | |||
| 482 | SemaRef.Diag(Entity.getDecl()->getLocation(), | |||
| 483 | diag::note_in_omitted_aggregate_initializer) | |||
| 484 | << /*field*/1 << Entity.getDecl(); | |||
| 485 | else if (Entity.getKind() == InitializedEntity::EK_ArrayElement) { | |||
| 486 | bool IsTrailingArrayNewMember = | |||
| 487 | Entity.getParent() && | |||
| 488 | Entity.getParent()->isVariableLengthArrayNew(); | |||
| 489 | SemaRef.Diag(Loc, diag::note_in_omitted_aggregate_initializer) | |||
| 490 | << (IsTrailingArrayNewMember ? 2 : /*array element*/0) | |||
| 491 | << Entity.getElementIndex(); | |||
| 492 | } | |||
| 493 | } | |||
| 494 | return ExprError(); | |||
| 495 | } | |||
| 496 | ||||
| 497 | return VerifyOnly ? ExprResult(static_cast<Expr *>(nullptr)) | |||
| 498 | : InitSeq.Perform(SemaRef, Entity, Kind, SubInit); | |||
| 499 | } | |||
| 500 | ||||
| 501 | void InitListChecker::CheckEmptyInitializable(const InitializedEntity &Entity, | |||
| 502 | SourceLocation Loc) { | |||
| 503 | assert(VerifyOnly &&(static_cast <bool> (VerifyOnly && "CheckEmptyInitializable is only inteded for verification mode." ) ? void (0) : __assert_fail ("VerifyOnly && \"CheckEmptyInitializable is only inteded for verification mode.\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 504, __extension__ __PRETTY_FUNCTION__)) | |||
| 504 | "CheckEmptyInitializable is only inteded for verification mode.")(static_cast <bool> (VerifyOnly && "CheckEmptyInitializable is only inteded for verification mode." ) ? void (0) : __assert_fail ("VerifyOnly && \"CheckEmptyInitializable is only inteded for verification mode.\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 504, __extension__ __PRETTY_FUNCTION__)); | |||
| 505 | if (PerformEmptyInit(SemaRef, Loc, Entity, /*VerifyOnly*/true, | |||
| 506 | TreatUnavailableAsInvalid).isInvalid()) | |||
| 507 | hadError = true; | |||
| 508 | } | |||
| 509 | ||||
| 510 | void InitListChecker::FillInEmptyInitForBase( | |||
| 511 | unsigned Init, const CXXBaseSpecifier &Base, | |||
| 512 | const InitializedEntity &ParentEntity, InitListExpr *ILE, | |||
| 513 | bool &RequiresSecondPass, bool FillWithNoInit) { | |||
| 514 | assert(Init < ILE->getNumInits() && "should have been expanded")(static_cast <bool> (Init < ILE->getNumInits() && "should have been expanded") ? void (0) : __assert_fail ("Init < ILE->getNumInits() && \"should have been expanded\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 514, __extension__ __PRETTY_FUNCTION__)); | |||
| 515 | ||||
| 516 | InitializedEntity BaseEntity = InitializedEntity::InitializeBase( | |||
| 517 | SemaRef.Context, &Base, false, &ParentEntity); | |||
| 518 | ||||
| 519 | if (!ILE->getInit(Init)) { | |||
| 520 | ExprResult BaseInit = | |||
| 521 | FillWithNoInit ? new (SemaRef.Context) NoInitExpr(Base.getType()) | |||
| 522 | : PerformEmptyInit(SemaRef, ILE->getLocEnd(), BaseEntity, | |||
| 523 | /*VerifyOnly*/ false, | |||
| 524 | TreatUnavailableAsInvalid); | |||
| 525 | if (BaseInit.isInvalid()) { | |||
| 526 | hadError = true; | |||
| 527 | return; | |||
| 528 | } | |||
| 529 | ||||
| 530 | ILE->setInit(Init, BaseInit.getAs<Expr>()); | |||
| 531 | } else if (InitListExpr *InnerILE = | |||
| 532 | dyn_cast<InitListExpr>(ILE->getInit(Init))) { | |||
| 533 | FillInEmptyInitializations(BaseEntity, InnerILE, RequiresSecondPass, | |||
| 534 | ILE, Init, FillWithNoInit); | |||
| 535 | } else if (DesignatedInitUpdateExpr *InnerDIUE = | |||
| 536 | dyn_cast<DesignatedInitUpdateExpr>(ILE->getInit(Init))) { | |||
| 537 | FillInEmptyInitializations(BaseEntity, InnerDIUE->getUpdater(), | |||
| 538 | RequiresSecondPass, ILE, Init, | |||
| 539 | /*FillWithNoInit =*/true); | |||
| 540 | } | |||
| 541 | } | |||
| 542 | ||||
| 543 | void InitListChecker::FillInEmptyInitForField(unsigned Init, FieldDecl *Field, | |||
| 544 | const InitializedEntity &ParentEntity, | |||
| 545 | InitListExpr *ILE, | |||
| 546 | bool &RequiresSecondPass, | |||
| 547 | bool FillWithNoInit) { | |||
| 548 | SourceLocation Loc = ILE->getLocEnd(); | |||
| 549 | unsigned NumInits = ILE->getNumInits(); | |||
| 550 | InitializedEntity MemberEntity | |||
| 551 | = InitializedEntity::InitializeMember(Field, &ParentEntity); | |||
| 552 | ||||
| 553 | if (const RecordType *RType = ILE->getType()->getAs<RecordType>()) | |||
| 554 | if (!RType->getDecl()->isUnion()) | |||
| 555 | assert(Init < NumInits && "This ILE should have been expanded")(static_cast <bool> (Init < NumInits && "This ILE should have been expanded" ) ? void (0) : __assert_fail ("Init < NumInits && \"This ILE should have been expanded\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 555, __extension__ __PRETTY_FUNCTION__)); | |||
| 556 | ||||
| 557 | if (Init >= NumInits || !ILE->getInit(Init)) { | |||
| 558 | if (FillWithNoInit) { | |||
| 559 | Expr *Filler = new (SemaRef.Context) NoInitExpr(Field->getType()); | |||
| 560 | if (Init < NumInits) | |||
| 561 | ILE->setInit(Init, Filler); | |||
| 562 | else | |||
| 563 | ILE->updateInit(SemaRef.Context, Init, Filler); | |||
| 564 | return; | |||
| 565 | } | |||
| 566 | // C++1y [dcl.init.aggr]p7: | |||
| 567 | // If there are fewer initializer-clauses in the list than there are | |||
| 568 | // members in the aggregate, then each member not explicitly initialized | |||
| 569 | // shall be initialized from its brace-or-equal-initializer [...] | |||
| 570 | if (Field->hasInClassInitializer()) { | |||
| 571 | ExprResult DIE = SemaRef.BuildCXXDefaultInitExpr(Loc, Field); | |||
| 572 | if (DIE.isInvalid()) { | |||
| 573 | hadError = true; | |||
| 574 | return; | |||
| 575 | } | |||
| 576 | SemaRef.checkInitializerLifetime(MemberEntity, DIE.get()); | |||
| 577 | if (Init < NumInits) | |||
| 578 | ILE->setInit(Init, DIE.get()); | |||
| 579 | else { | |||
| 580 | ILE->updateInit(SemaRef.Context, Init, DIE.get()); | |||
| 581 | RequiresSecondPass = true; | |||
| 582 | } | |||
| 583 | return; | |||
| 584 | } | |||
| 585 | ||||
| 586 | if (Field->getType()->isReferenceType()) { | |||
| 587 | // C++ [dcl.init.aggr]p9: | |||
| 588 | // If an incomplete or empty initializer-list leaves a | |||
| 589 | // member of reference type uninitialized, the program is | |||
| 590 | // ill-formed. | |||
| 591 | SemaRef.Diag(Loc, diag::err_init_reference_member_uninitialized) | |||
| 592 | << Field->getType() | |||
| 593 | << ILE->getSyntacticForm()->getSourceRange(); | |||
| 594 | SemaRef.Diag(Field->getLocation(), | |||
| 595 | diag::note_uninit_reference_member); | |||
| 596 | hadError = true; | |||
| 597 | return; | |||
| 598 | } | |||
| 599 | ||||
| 600 | ExprResult MemberInit = PerformEmptyInit(SemaRef, Loc, MemberEntity, | |||
| 601 | /*VerifyOnly*/false, | |||
| 602 | TreatUnavailableAsInvalid); | |||
| 603 | if (MemberInit.isInvalid()) { | |||
| 604 | hadError = true; | |||
| 605 | return; | |||
| 606 | } | |||
| 607 | ||||
| 608 | if (hadError) { | |||
| 609 | // Do nothing | |||
| 610 | } else if (Init < NumInits) { | |||
| 611 | ILE->setInit(Init, MemberInit.getAs<Expr>()); | |||
| 612 | } else if (!isa<ImplicitValueInitExpr>(MemberInit.get())) { | |||
| 613 | // Empty initialization requires a constructor call, so | |||
| 614 | // extend the initializer list to include the constructor | |||
| 615 | // call and make a note that we'll need to take another pass | |||
| 616 | // through the initializer list. | |||
| 617 | ILE->updateInit(SemaRef.Context, Init, MemberInit.getAs<Expr>()); | |||
| 618 | RequiresSecondPass = true; | |||
| 619 | } | |||
| 620 | } else if (InitListExpr *InnerILE | |||
| 621 | = dyn_cast<InitListExpr>(ILE->getInit(Init))) | |||
| 622 | FillInEmptyInitializations(MemberEntity, InnerILE, | |||
| 623 | RequiresSecondPass, ILE, Init, FillWithNoInit); | |||
| 624 | else if (DesignatedInitUpdateExpr *InnerDIUE | |||
| 625 | = dyn_cast<DesignatedInitUpdateExpr>(ILE->getInit(Init))) | |||
| 626 | FillInEmptyInitializations(MemberEntity, InnerDIUE->getUpdater(), | |||
| 627 | RequiresSecondPass, ILE, Init, | |||
| 628 | /*FillWithNoInit =*/true); | |||
| 629 | } | |||
| 630 | ||||
| 631 | /// Recursively replaces NULL values within the given initializer list | |||
| 632 | /// with expressions that perform value-initialization of the | |||
| 633 | /// appropriate type, and finish off the InitListExpr formation. | |||
| 634 | void | |||
| 635 | InitListChecker::FillInEmptyInitializations(const InitializedEntity &Entity, | |||
| 636 | InitListExpr *ILE, | |||
| 637 | bool &RequiresSecondPass, | |||
| 638 | InitListExpr *OuterILE, | |||
| 639 | unsigned OuterIndex, | |||
| 640 | bool FillWithNoInit) { | |||
| 641 | assert((ILE->getType() != SemaRef.Context.VoidTy) &&(static_cast <bool> ((ILE->getType() != SemaRef.Context .VoidTy) && "Should not have void type") ? void (0) : __assert_fail ("(ILE->getType() != SemaRef.Context.VoidTy) && \"Should not have void type\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 642, __extension__ __PRETTY_FUNCTION__)) | |||
| 642 | "Should not have void type")(static_cast <bool> ((ILE->getType() != SemaRef.Context .VoidTy) && "Should not have void type") ? void (0) : __assert_fail ("(ILE->getType() != SemaRef.Context.VoidTy) && \"Should not have void type\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 642, __extension__ __PRETTY_FUNCTION__)); | |||
| 643 | ||||
| 644 | // If this is a nested initializer list, we might have changed its contents | |||
| 645 | // (and therefore some of its properties, such as instantiation-dependence) | |||
| 646 | // while filling it in. Inform the outer initializer list so that its state | |||
| 647 | // can be updated to match. | |||
| 648 | // FIXME: We should fully build the inner initializers before constructing | |||
| 649 | // the outer InitListExpr instead of mutating AST nodes after they have | |||
| 650 | // been used as subexpressions of other nodes. | |||
| 651 | struct UpdateOuterILEWithUpdatedInit { | |||
| 652 | InitListExpr *Outer; | |||
| 653 | unsigned OuterIndex; | |||
| 654 | ~UpdateOuterILEWithUpdatedInit() { | |||
| 655 | if (Outer) | |||
| 656 | Outer->setInit(OuterIndex, Outer->getInit(OuterIndex)); | |||
| 657 | } | |||
| 658 | } UpdateOuterRAII = {OuterILE, OuterIndex}; | |||
| 659 | ||||
| 660 | // A transparent ILE is not performing aggregate initialization and should | |||
| 661 | // not be filled in. | |||
| 662 | if (ILE->isTransparent()) | |||
| 663 | return; | |||
| 664 | ||||
| 665 | if (const RecordType *RType = ILE->getType()->getAs<RecordType>()) { | |||
| 666 | const RecordDecl *RDecl = RType->getDecl(); | |||
| 667 | if (RDecl->isUnion() && ILE->getInitializedFieldInUnion()) | |||
| 668 | FillInEmptyInitForField(0, ILE->getInitializedFieldInUnion(), | |||
| 669 | Entity, ILE, RequiresSecondPass, FillWithNoInit); | |||
| 670 | else if (RDecl->isUnion() && isa<CXXRecordDecl>(RDecl) && | |||
| 671 | cast<CXXRecordDecl>(RDecl)->hasInClassInitializer()) { | |||
| 672 | for (auto *Field : RDecl->fields()) { | |||
| 673 | if (Field->hasInClassInitializer()) { | |||
| 674 | FillInEmptyInitForField(0, Field, Entity, ILE, RequiresSecondPass, | |||
| 675 | FillWithNoInit); | |||
| 676 | break; | |||
| 677 | } | |||
| 678 | } | |||
| 679 | } else { | |||
| 680 | // The fields beyond ILE->getNumInits() are default initialized, so in | |||
| 681 | // order to leave them uninitialized, the ILE is expanded and the extra | |||
| 682 | // fields are then filled with NoInitExpr. | |||
| 683 | unsigned NumElems = numStructUnionElements(ILE->getType()); | |||
| 684 | if (RDecl->hasFlexibleArrayMember()) | |||
| 685 | ++NumElems; | |||
| 686 | if (ILE->getNumInits() < NumElems) | |||
| 687 | ILE->resizeInits(SemaRef.Context, NumElems); | |||
| 688 | ||||
| 689 | unsigned Init = 0; | |||
| 690 | ||||
| 691 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RDecl)) { | |||
| 692 | for (auto &Base : CXXRD->bases()) { | |||
| 693 | if (hadError) | |||
| 694 | return; | |||
| 695 | ||||
| 696 | FillInEmptyInitForBase(Init, Base, Entity, ILE, RequiresSecondPass, | |||
| 697 | FillWithNoInit); | |||
| 698 | ++Init; | |||
| 699 | } | |||
| 700 | } | |||
| 701 | ||||
| 702 | for (auto *Field : RDecl->fields()) { | |||
| 703 | if (Field->isUnnamedBitfield()) | |||
| 704 | continue; | |||
| 705 | ||||
| 706 | if (hadError) | |||
| 707 | return; | |||
| 708 | ||||
| 709 | FillInEmptyInitForField(Init, Field, Entity, ILE, RequiresSecondPass, | |||
| 710 | FillWithNoInit); | |||
| 711 | if (hadError) | |||
| 712 | return; | |||
| 713 | ||||
| 714 | ++Init; | |||
| 715 | ||||
| 716 | // Only look at the first initialization of a union. | |||
| 717 | if (RDecl->isUnion()) | |||
| 718 | break; | |||
| 719 | } | |||
| 720 | } | |||
| 721 | ||||
| 722 | return; | |||
| 723 | } | |||
| 724 | ||||
| 725 | QualType ElementType; | |||
| 726 | ||||
| 727 | InitializedEntity ElementEntity = Entity; | |||
| 728 | unsigned NumInits = ILE->getNumInits(); | |||
| 729 | unsigned NumElements = NumInits; | |||
| 730 | if (const ArrayType *AType = SemaRef.Context.getAsArrayType(ILE->getType())) { | |||
| 731 | ElementType = AType->getElementType(); | |||
| 732 | if (const auto *CAType = dyn_cast<ConstantArrayType>(AType)) | |||
| 733 | NumElements = CAType->getSize().getZExtValue(); | |||
| 734 | // For an array new with an unknown bound, ask for one additional element | |||
| 735 | // in order to populate the array filler. | |||
| 736 | if (Entity.isVariableLengthArrayNew()) | |||
| 737 | ++NumElements; | |||
| 738 | ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context, | |||
| 739 | 0, Entity); | |||
| 740 | } else if (const VectorType *VType = ILE->getType()->getAs<VectorType>()) { | |||
| 741 | ElementType = VType->getElementType(); | |||
| 742 | NumElements = VType->getNumElements(); | |||
| 743 | ElementEntity = InitializedEntity::InitializeElement(SemaRef.Context, | |||
| 744 | 0, Entity); | |||
| 745 | } else | |||
| 746 | ElementType = ILE->getType(); | |||
| 747 | ||||
| 748 | for (unsigned Init = 0; Init != NumElements; ++Init) { | |||
| 749 | if (hadError) | |||
| 750 | return; | |||
| 751 | ||||
| 752 | if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement || | |||
| 753 | ElementEntity.getKind() == InitializedEntity::EK_VectorElement) | |||
| 754 | ElementEntity.setElementIndex(Init); | |||
| 755 | ||||
| 756 | if (Init >= NumInits && ILE->hasArrayFiller()) | |||
| 757 | return; | |||
| 758 | ||||
| 759 | Expr *InitExpr = (Init < NumInits ? ILE->getInit(Init) : nullptr); | |||
| 760 | if (!InitExpr && Init < NumInits && ILE->hasArrayFiller()) | |||
| 761 | ILE->setInit(Init, ILE->getArrayFiller()); | |||
| 762 | else if (!InitExpr && !ILE->hasArrayFiller()) { | |||
| 763 | Expr *Filler = nullptr; | |||
| 764 | ||||
| 765 | if (FillWithNoInit) | |||
| 766 | Filler = new (SemaRef.Context) NoInitExpr(ElementType); | |||
| 767 | else { | |||
| 768 | ExprResult ElementInit = PerformEmptyInit(SemaRef, ILE->getLocEnd(), | |||
| 769 | ElementEntity, | |||
| 770 | /*VerifyOnly*/false, | |||
| 771 | TreatUnavailableAsInvalid); | |||
| 772 | if (ElementInit.isInvalid()) { | |||
| 773 | hadError = true; | |||
| 774 | return; | |||
| 775 | } | |||
| 776 | ||||
| 777 | Filler = ElementInit.getAs<Expr>(); | |||
| 778 | } | |||
| 779 | ||||
| 780 | if (hadError) { | |||
| 781 | // Do nothing | |||
| 782 | } else if (Init < NumInits) { | |||
| 783 | // For arrays, just set the expression used for value-initialization | |||
| 784 | // of the "holes" in the array. | |||
| 785 | if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement) | |||
| 786 | ILE->setArrayFiller(Filler); | |||
| 787 | else | |||
| 788 | ILE->setInit(Init, Filler); | |||
| 789 | } else { | |||
| 790 | // For arrays, just set the expression used for value-initialization | |||
| 791 | // of the rest of elements and exit. | |||
| 792 | if (ElementEntity.getKind() == InitializedEntity::EK_ArrayElement) { | |||
| 793 | ILE->setArrayFiller(Filler); | |||
| 794 | return; | |||
| 795 | } | |||
| 796 | ||||
| 797 | if (!isa<ImplicitValueInitExpr>(Filler) && !isa<NoInitExpr>(Filler)) { | |||
| 798 | // Empty initialization requires a constructor call, so | |||
| 799 | // extend the initializer list to include the constructor | |||
| 800 | // call and make a note that we'll need to take another pass | |||
| 801 | // through the initializer list. | |||
| 802 | ILE->updateInit(SemaRef.Context, Init, Filler); | |||
| 803 | RequiresSecondPass = true; | |||
| 804 | } | |||
| 805 | } | |||
| 806 | } else if (InitListExpr *InnerILE | |||
| 807 | = dyn_cast_or_null<InitListExpr>(InitExpr)) | |||
| 808 | FillInEmptyInitializations(ElementEntity, InnerILE, RequiresSecondPass, | |||
| 809 | ILE, Init, FillWithNoInit); | |||
| 810 | else if (DesignatedInitUpdateExpr *InnerDIUE | |||
| 811 | = dyn_cast_or_null<DesignatedInitUpdateExpr>(InitExpr)) | |||
| 812 | FillInEmptyInitializations(ElementEntity, InnerDIUE->getUpdater(), | |||
| 813 | RequiresSecondPass, ILE, Init, | |||
| 814 | /*FillWithNoInit =*/true); | |||
| 815 | } | |||
| 816 | } | |||
| 817 | ||||
| 818 | InitListChecker::InitListChecker(Sema &S, const InitializedEntity &Entity, | |||
| 819 | InitListExpr *IL, QualType &T, | |||
| 820 | bool VerifyOnly, | |||
| 821 | bool TreatUnavailableAsInvalid) | |||
| 822 | : SemaRef(S), VerifyOnly(VerifyOnly), | |||
| 823 | TreatUnavailableAsInvalid(TreatUnavailableAsInvalid) { | |||
| 824 | // FIXME: Check that IL isn't already the semantic form of some other | |||
| 825 | // InitListExpr. If it is, we'd create a broken AST. | |||
| 826 | ||||
| 827 | hadError = false; | |||
| 828 | ||||
| 829 | FullyStructuredList = | |||
| 830 | getStructuredSubobjectInit(IL, 0, T, nullptr, 0, IL->getSourceRange()); | |||
| 831 | CheckExplicitInitList(Entity, IL, T, FullyStructuredList, | |||
| 832 | /*TopLevelObject=*/true); | |||
| 833 | ||||
| 834 | if (!hadError && !VerifyOnly) { | |||
| 835 | bool RequiresSecondPass = false; | |||
| 836 | FillInEmptyInitializations(Entity, FullyStructuredList, RequiresSecondPass, | |||
| 837 | /*OuterILE=*/nullptr, /*OuterIndex=*/0); | |||
| 838 | if (RequiresSecondPass && !hadError) | |||
| 839 | FillInEmptyInitializations(Entity, FullyStructuredList, | |||
| 840 | RequiresSecondPass, nullptr, 0); | |||
| 841 | } | |||
| 842 | } | |||
| 843 | ||||
| 844 | int InitListChecker::numArrayElements(QualType DeclType) { | |||
| 845 | // FIXME: use a proper constant | |||
| 846 | int maxElements = 0x7FFFFFFF; | |||
| 847 | if (const ConstantArrayType *CAT = | |||
| 848 | SemaRef.Context.getAsConstantArrayType(DeclType)) { | |||
| 849 | maxElements = static_cast<int>(CAT->getSize().getZExtValue()); | |||
| 850 | } | |||
| 851 | return maxElements; | |||
| 852 | } | |||
| 853 | ||||
| 854 | int InitListChecker::numStructUnionElements(QualType DeclType) { | |||
| 855 | RecordDecl *structDecl = DeclType->getAs<RecordType>()->getDecl(); | |||
| 856 | int InitializableMembers = 0; | |||
| 857 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(structDecl)) | |||
| 858 | InitializableMembers += CXXRD->getNumBases(); | |||
| 859 | for (const auto *Field : structDecl->fields()) | |||
| 860 | if (!Field->isUnnamedBitfield()) | |||
| 861 | ++InitializableMembers; | |||
| 862 | ||||
| 863 | if (structDecl->isUnion()) | |||
| 864 | return std::min(InitializableMembers, 1); | |||
| 865 | return InitializableMembers - structDecl->hasFlexibleArrayMember(); | |||
| 866 | } | |||
| 867 | ||||
| 868 | /// Determine whether Entity is an entity for which it is idiomatic to elide | |||
| 869 | /// the braces in aggregate initialization. | |||
| 870 | static bool isIdiomaticBraceElisionEntity(const InitializedEntity &Entity) { | |||
| 871 | // Recursive initialization of the one and only field within an aggregate | |||
| 872 | // class is considered idiomatic. This case arises in particular for | |||
| 873 | // initialization of std::array, where the C++ standard suggests the idiom of | |||
| 874 | // | |||
| 875 | // std::array<T, N> arr = {1, 2, 3}; | |||
| 876 | // | |||
| 877 | // (where std::array is an aggregate struct containing a single array field. | |||
| 878 | ||||
| 879 | // FIXME: Should aggregate initialization of a struct with a single | |||
| 880 | // base class and no members also suppress the warning? | |||
| 881 | if (Entity.getKind() != InitializedEntity::EK_Member || !Entity.getParent()) | |||
| 882 | return false; | |||
| 883 | ||||
| 884 | auto *ParentRD = | |||
| 885 | Entity.getParent()->getType()->castAs<RecordType>()->getDecl(); | |||
| 886 | if (CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(ParentRD)) | |||
| 887 | if (CXXRD->getNumBases()) | |||
| 888 | return false; | |||
| 889 | ||||
| 890 | auto FieldIt = ParentRD->field_begin(); | |||
| 891 | assert(FieldIt != ParentRD->field_end() &&(static_cast <bool> (FieldIt != ParentRD->field_end( ) && "no fields but have initializer for member?") ? void (0) : __assert_fail ("FieldIt != ParentRD->field_end() && \"no fields but have initializer for member?\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 892, __extension__ __PRETTY_FUNCTION__)) | |||
| 892 | "no fields but have initializer for member?")(static_cast <bool> (FieldIt != ParentRD->field_end( ) && "no fields but have initializer for member?") ? void (0) : __assert_fail ("FieldIt != ParentRD->field_end() && \"no fields but have initializer for member?\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 892, __extension__ __PRETTY_FUNCTION__)); | |||
| 893 | return ++FieldIt == ParentRD->field_end(); | |||
| 894 | } | |||
| 895 | ||||
| 896 | /// Check whether the range of the initializer \p ParentIList from element | |||
| 897 | /// \p Index onwards can be used to initialize an object of type \p T. Update | |||
| 898 | /// \p Index to indicate how many elements of the list were consumed. | |||
| 899 | /// | |||
| 900 | /// This also fills in \p StructuredList, from element \p StructuredIndex | |||
| 901 | /// onwards, with the fully-braced, desugared form of the initialization. | |||
| 902 | void InitListChecker::CheckImplicitInitList(const InitializedEntity &Entity, | |||
| 903 | InitListExpr *ParentIList, | |||
| 904 | QualType T, unsigned &Index, | |||
| 905 | InitListExpr *StructuredList, | |||
| 906 | unsigned &StructuredIndex) { | |||
| 907 | int maxElements = 0; | |||
| 908 | ||||
| 909 | if (T->isArrayType()) | |||
| 910 | maxElements = numArrayElements(T); | |||
| 911 | else if (T->isRecordType()) | |||
| 912 | maxElements = numStructUnionElements(T); | |||
| 913 | else if (T->isVectorType()) | |||
| 914 | maxElements = T->getAs<VectorType>()->getNumElements(); | |||
| 915 | else | |||
| 916 | llvm_unreachable("CheckImplicitInitList(): Illegal type")::llvm::llvm_unreachable_internal("CheckImplicitInitList(): Illegal type" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 916); | |||
| 917 | ||||
| 918 | if (maxElements == 0) { | |||
| 919 | if (!VerifyOnly) | |||
| 920 | SemaRef.Diag(ParentIList->getInit(Index)->getLocStart(), | |||
| 921 | diag::err_implicit_empty_initializer); | |||
| 922 | ++Index; | |||
| 923 | hadError = true; | |||
| 924 | return; | |||
| 925 | } | |||
| 926 | ||||
| 927 | // Build a structured initializer list corresponding to this subobject. | |||
| 928 | InitListExpr *StructuredSubobjectInitList | |||
| 929 | = getStructuredSubobjectInit(ParentIList, Index, T, StructuredList, | |||
| 930 | StructuredIndex, | |||
| 931 | SourceRange(ParentIList->getInit(Index)->getLocStart(), | |||
| 932 | ParentIList->getSourceRange().getEnd())); | |||
| 933 | unsigned StructuredSubobjectInitIndex = 0; | |||
| 934 | ||||
| 935 | // Check the element types and build the structural subobject. | |||
| 936 | unsigned StartIndex = Index; | |||
| 937 | CheckListElementTypes(Entity, ParentIList, T, | |||
| 938 | /*SubobjectIsDesignatorContext=*/false, Index, | |||
| 939 | StructuredSubobjectInitList, | |||
| 940 | StructuredSubobjectInitIndex); | |||
| 941 | ||||
| 942 | if (!VerifyOnly) { | |||
| 943 | StructuredSubobjectInitList->setType(T); | |||
| 944 | ||||
| 945 | unsigned EndIndex = (Index == StartIndex? StartIndex : Index - 1); | |||
| 946 | // Update the structured sub-object initializer so that it's ending | |||
| 947 | // range corresponds with the end of the last initializer it used. | |||
| 948 | if (EndIndex < ParentIList->getNumInits() && | |||
| 949 | ParentIList->getInit(EndIndex)) { | |||
| 950 | SourceLocation EndLoc | |||
| 951 | = ParentIList->getInit(EndIndex)->getSourceRange().getEnd(); | |||
| 952 | StructuredSubobjectInitList->setRBraceLoc(EndLoc); | |||
| 953 | } | |||
| 954 | ||||
| 955 | // Complain about missing braces. | |||
| 956 | if ((T->isArrayType() || T->isRecordType()) && | |||
| 957 | !ParentIList->isIdiomaticZeroInitializer(SemaRef.getLangOpts()) && | |||
| 958 | !isIdiomaticBraceElisionEntity(Entity)) { | |||
| 959 | SemaRef.Diag(StructuredSubobjectInitList->getLocStart(), | |||
| 960 | diag::warn_missing_braces) | |||
| 961 | << StructuredSubobjectInitList->getSourceRange() | |||
| 962 | << FixItHint::CreateInsertion( | |||
| 963 | StructuredSubobjectInitList->getLocStart(), "{") | |||
| 964 | << FixItHint::CreateInsertion( | |||
| 965 | SemaRef.getLocForEndOfToken( | |||
| 966 | StructuredSubobjectInitList->getLocEnd()), | |||
| 967 | "}"); | |||
| 968 | } | |||
| 969 | } | |||
| 970 | } | |||
| 971 | ||||
| 972 | /// Warn that \p Entity was of scalar type and was initialized by a | |||
| 973 | /// single-element braced initializer list. | |||
| 974 | static void warnBracedScalarInit(Sema &S, const InitializedEntity &Entity, | |||
| 975 | SourceRange Braces) { | |||
| 976 | // Don't warn during template instantiation. If the initialization was | |||
| 977 | // non-dependent, we warned during the initial parse; otherwise, the | |||
| 978 | // type might not be scalar in some uses of the template. | |||
| 979 | if (S.inTemplateInstantiation()) | |||
| 980 | return; | |||
| 981 | ||||
| 982 | unsigned DiagID = 0; | |||
| 983 | ||||
| 984 | switch (Entity.getKind()) { | |||
| 985 | case InitializedEntity::EK_VectorElement: | |||
| 986 | case InitializedEntity::EK_ComplexElement: | |||
| 987 | case InitializedEntity::EK_ArrayElement: | |||
| 988 | case InitializedEntity::EK_Parameter: | |||
| 989 | case InitializedEntity::EK_Parameter_CF_Audited: | |||
| 990 | case InitializedEntity::EK_Result: | |||
| 991 | // Extra braces here are suspicious. | |||
| 992 | DiagID = diag::warn_braces_around_scalar_init; | |||
| 993 | break; | |||
| 994 | ||||
| 995 | case InitializedEntity::EK_Member: | |||
| 996 | // Warn on aggregate initialization but not on ctor init list or | |||
| 997 | // default member initializer. | |||
| 998 | if (Entity.getParent()) | |||
| 999 | DiagID = diag::warn_braces_around_scalar_init; | |||
| 1000 | break; | |||
| 1001 | ||||
| 1002 | case InitializedEntity::EK_Variable: | |||
| 1003 | case InitializedEntity::EK_LambdaCapture: | |||
| 1004 | // No warning, might be direct-list-initialization. | |||
| 1005 | // FIXME: Should we warn for copy-list-initialization in these cases? | |||
| 1006 | break; | |||
| 1007 | ||||
| 1008 | case InitializedEntity::EK_New: | |||
| 1009 | case InitializedEntity::EK_Temporary: | |||
| 1010 | case InitializedEntity::EK_CompoundLiteralInit: | |||
| 1011 | // No warning, braces are part of the syntax of the underlying construct. | |||
| 1012 | break; | |||
| 1013 | ||||
| 1014 | case InitializedEntity::EK_RelatedResult: | |||
| 1015 | // No warning, we already warned when initializing the result. | |||
| 1016 | break; | |||
| 1017 | ||||
| 1018 | case InitializedEntity::EK_Exception: | |||
| 1019 | case InitializedEntity::EK_Base: | |||
| 1020 | case InitializedEntity::EK_Delegating: | |||
| 1021 | case InitializedEntity::EK_BlockElement: | |||
| 1022 | case InitializedEntity::EK_LambdaToBlockConversionBlockElement: | |||
| 1023 | case InitializedEntity::EK_Binding: | |||
| 1024 | case InitializedEntity::EK_StmtExprResult: | |||
| 1025 | llvm_unreachable("unexpected braced scalar init")::llvm::llvm_unreachable_internal("unexpected braced scalar init" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 1025); | |||
| 1026 | } | |||
| 1027 | ||||
| 1028 | if (DiagID) { | |||
| 1029 | S.Diag(Braces.getBegin(), DiagID) | |||
| 1030 | << Braces | |||
| 1031 | << FixItHint::CreateRemoval(Braces.getBegin()) | |||
| 1032 | << FixItHint::CreateRemoval(Braces.getEnd()); | |||
| 1033 | } | |||
| 1034 | } | |||
| 1035 | ||||
| 1036 | /// Check whether the initializer \p IList (that was written with explicit | |||
| 1037 | /// braces) can be used to initialize an object of type \p T. | |||
| 1038 | /// | |||
| 1039 | /// This also fills in \p StructuredList with the fully-braced, desugared | |||
| 1040 | /// form of the initialization. | |||
| 1041 | void InitListChecker::CheckExplicitInitList(const InitializedEntity &Entity, | |||
| 1042 | InitListExpr *IList, QualType &T, | |||
| 1043 | InitListExpr *StructuredList, | |||
| 1044 | bool TopLevelObject) { | |||
| 1045 | if (!VerifyOnly) { | |||
| 1046 | SyntacticToSemantic[IList] = StructuredList; | |||
| 1047 | StructuredList->setSyntacticForm(IList); | |||
| 1048 | } | |||
| 1049 | ||||
| 1050 | unsigned Index = 0, StructuredIndex = 0; | |||
| 1051 | CheckListElementTypes(Entity, IList, T, /*SubobjectIsDesignatorContext=*/true, | |||
| 1052 | Index, StructuredList, StructuredIndex, TopLevelObject); | |||
| 1053 | if (!VerifyOnly) { | |||
| 1054 | QualType ExprTy = T; | |||
| 1055 | if (!ExprTy->isArrayType()) | |||
| 1056 | ExprTy = ExprTy.getNonLValueExprType(SemaRef.Context); | |||
| 1057 | IList->setType(ExprTy); | |||
| 1058 | StructuredList->setType(ExprTy); | |||
| 1059 | } | |||
| 1060 | if (hadError) | |||
| 1061 | return; | |||
| 1062 | ||||
| 1063 | if (Index < IList->getNumInits()) { | |||
| 1064 | // We have leftover initializers | |||
| 1065 | if (VerifyOnly) { | |||
| 1066 | if (SemaRef.getLangOpts().CPlusPlus || | |||
| 1067 | (SemaRef.getLangOpts().OpenCL && | |||
| 1068 | IList->getType()->isVectorType())) { | |||
| 1069 | hadError = true; | |||
| 1070 | } | |||
| 1071 | return; | |||
| 1072 | } | |||
| 1073 | ||||
| 1074 | if (StructuredIndex == 1 && | |||
| 1075 | IsStringInit(StructuredList->getInit(0), T, SemaRef.Context) == | |||
| 1076 | SIF_None) { | |||
| 1077 | unsigned DK = diag::ext_excess_initializers_in_char_array_initializer; | |||
| 1078 | if (SemaRef.getLangOpts().CPlusPlus) { | |||
| 1079 | DK = diag::err_excess_initializers_in_char_array_initializer; | |||
| 1080 | hadError = true; | |||
| 1081 | } | |||
| 1082 | // Special-case | |||
| 1083 | SemaRef.Diag(IList->getInit(Index)->getLocStart(), DK) | |||
| 1084 | << IList->getInit(Index)->getSourceRange(); | |||
| 1085 | } else if (!T->isIncompleteType()) { | |||
| 1086 | // Don't complain for incomplete types, since we'll get an error | |||
| 1087 | // elsewhere | |||
| 1088 | QualType CurrentObjectType = StructuredList->getType(); | |||
| 1089 | int initKind = | |||
| 1090 | CurrentObjectType->isArrayType()? 0 : | |||
| 1091 | CurrentObjectType->isVectorType()? 1 : | |||
| 1092 | CurrentObjectType->isScalarType()? 2 : | |||
| 1093 | CurrentObjectType->isUnionType()? 3 : | |||
| 1094 | 4; | |||
| 1095 | ||||
| 1096 | unsigned DK = diag::ext_excess_initializers; | |||
| 1097 | if (SemaRef.getLangOpts().CPlusPlus) { | |||
| 1098 | DK = diag::err_excess_initializers; | |||
| 1099 | hadError = true; | |||
| 1100 | } | |||
| 1101 | if (SemaRef.getLangOpts().OpenCL && initKind == 1) { | |||
| 1102 | DK = diag::err_excess_initializers; | |||
| 1103 | hadError = true; | |||
| 1104 | } | |||
| 1105 | ||||
| 1106 | SemaRef.Diag(IList->getInit(Index)->getLocStart(), DK) | |||
| 1107 | << initKind << IList->getInit(Index)->getSourceRange(); | |||
| 1108 | } | |||
| 1109 | } | |||
| 1110 | ||||
| 1111 | if (!VerifyOnly && T->isScalarType() && | |||
| 1112 | IList->getNumInits() == 1 && !isa<InitListExpr>(IList->getInit(0))) | |||
| 1113 | warnBracedScalarInit(SemaRef, Entity, IList->getSourceRange()); | |||
| 1114 | } | |||
| 1115 | ||||
| 1116 | void InitListChecker::CheckListElementTypes(const InitializedEntity &Entity, | |||
| 1117 | InitListExpr *IList, | |||
| 1118 | QualType &DeclType, | |||
| 1119 | bool SubobjectIsDesignatorContext, | |||
| 1120 | unsigned &Index, | |||
| 1121 | InitListExpr *StructuredList, | |||
| 1122 | unsigned &StructuredIndex, | |||
| 1123 | bool TopLevelObject) { | |||
| 1124 | if (DeclType->isAnyComplexType() && SubobjectIsDesignatorContext) { | |||
| 1125 | // Explicitly braced initializer for complex type can be real+imaginary | |||
| 1126 | // parts. | |||
| 1127 | CheckComplexType(Entity, IList, DeclType, Index, | |||
| 1128 | StructuredList, StructuredIndex); | |||
| 1129 | } else if (DeclType->isScalarType()) { | |||
| 1130 | CheckScalarType(Entity, IList, DeclType, Index, | |||
| 1131 | StructuredList, StructuredIndex); | |||
| 1132 | } else if (DeclType->isVectorType()) { | |||
| 1133 | CheckVectorType(Entity, IList, DeclType, Index, | |||
| 1134 | StructuredList, StructuredIndex); | |||
| 1135 | } else if (DeclType->isRecordType()) { | |||
| 1136 | assert(DeclType->isAggregateType() &&(static_cast <bool> (DeclType->isAggregateType() && "non-aggregate records should be handed in CheckSubElementType" ) ? void (0) : __assert_fail ("DeclType->isAggregateType() && \"non-aggregate records should be handed in CheckSubElementType\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 1137, __extension__ __PRETTY_FUNCTION__)) | |||
| 1137 | "non-aggregate records should be handed in CheckSubElementType")(static_cast <bool> (DeclType->isAggregateType() && "non-aggregate records should be handed in CheckSubElementType" ) ? void (0) : __assert_fail ("DeclType->isAggregateType() && \"non-aggregate records should be handed in CheckSubElementType\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 1137, __extension__ __PRETTY_FUNCTION__)); | |||
| 1138 | RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl(); | |||
| 1139 | auto Bases = | |||
| 1140 | CXXRecordDecl::base_class_range(CXXRecordDecl::base_class_iterator(), | |||
| 1141 | CXXRecordDecl::base_class_iterator()); | |||
| 1142 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RD)) | |||
| 1143 | Bases = CXXRD->bases(); | |||
| 1144 | CheckStructUnionTypes(Entity, IList, DeclType, Bases, RD->field_begin(), | |||
| 1145 | SubobjectIsDesignatorContext, Index, StructuredList, | |||
| 1146 | StructuredIndex, TopLevelObject); | |||
| 1147 | } else if (DeclType->isArrayType()) { | |||
| 1148 | llvm::APSInt Zero( | |||
| 1149 | SemaRef.Context.getTypeSize(SemaRef.Context.getSizeType()), | |||
| 1150 | false); | |||
| 1151 | CheckArrayType(Entity, IList, DeclType, Zero, | |||
| 1152 | SubobjectIsDesignatorContext, Index, | |||
| 1153 | StructuredList, StructuredIndex); | |||
| 1154 | } else if (DeclType->isVoidType() || DeclType->isFunctionType()) { | |||
| 1155 | // This type is invalid, issue a diagnostic. | |||
| 1156 | ++Index; | |||
| 1157 | if (!VerifyOnly) | |||
| 1158 | SemaRef.Diag(IList->getLocStart(), diag::err_illegal_initializer_type) | |||
| 1159 | << DeclType; | |||
| 1160 | hadError = true; | |||
| 1161 | } else if (DeclType->isReferenceType()) { | |||
| 1162 | CheckReferenceType(Entity, IList, DeclType, Index, | |||
| 1163 | StructuredList, StructuredIndex); | |||
| 1164 | } else if (DeclType->isObjCObjectType()) { | |||
| 1165 | if (!VerifyOnly) | |||
| 1166 | SemaRef.Diag(IList->getLocStart(), diag::err_init_objc_class) | |||
| 1167 | << DeclType; | |||
| 1168 | hadError = true; | |||
| 1169 | } else { | |||
| 1170 | if (!VerifyOnly) | |||
| 1171 | SemaRef.Diag(IList->getLocStart(), diag::err_illegal_initializer_type) | |||
| 1172 | << DeclType; | |||
| 1173 | hadError = true; | |||
| 1174 | } | |||
| 1175 | } | |||
| 1176 | ||||
| 1177 | void InitListChecker::CheckSubElementType(const InitializedEntity &Entity, | |||
| 1178 | InitListExpr *IList, | |||
| 1179 | QualType ElemType, | |||
| 1180 | unsigned &Index, | |||
| 1181 | InitListExpr *StructuredList, | |||
| 1182 | unsigned &StructuredIndex) { | |||
| 1183 | Expr *expr = IList->getInit(Index); | |||
| 1184 | ||||
| 1185 | if (ElemType->isReferenceType()) | |||
| 1186 | return CheckReferenceType(Entity, IList, ElemType, Index, | |||
| 1187 | StructuredList, StructuredIndex); | |||
| 1188 | ||||
| 1189 | if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) { | |||
| 1190 | if (SubInitList->getNumInits() == 1 && | |||
| 1191 | IsStringInit(SubInitList->getInit(0), ElemType, SemaRef.Context) == | |||
| 1192 | SIF_None) { | |||
| 1193 | expr = SubInitList->getInit(0); | |||
| 1194 | } else if (!SemaRef.getLangOpts().CPlusPlus) { | |||
| 1195 | InitListExpr *InnerStructuredList | |||
| 1196 | = getStructuredSubobjectInit(IList, Index, ElemType, | |||
| 1197 | StructuredList, StructuredIndex, | |||
| 1198 | SubInitList->getSourceRange(), true); | |||
| 1199 | CheckExplicitInitList(Entity, SubInitList, ElemType, | |||
| 1200 | InnerStructuredList); | |||
| 1201 | ||||
| 1202 | if (!hadError && !VerifyOnly) { | |||
| 1203 | bool RequiresSecondPass = false; | |||
| 1204 | FillInEmptyInitializations(Entity, InnerStructuredList, | |||
| 1205 | RequiresSecondPass, StructuredList, | |||
| 1206 | StructuredIndex); | |||
| 1207 | if (RequiresSecondPass && !hadError) | |||
| 1208 | FillInEmptyInitializations(Entity, InnerStructuredList, | |||
| 1209 | RequiresSecondPass, StructuredList, | |||
| 1210 | StructuredIndex); | |||
| 1211 | } | |||
| 1212 | ++StructuredIndex; | |||
| 1213 | ++Index; | |||
| 1214 | return; | |||
| 1215 | } | |||
| 1216 | // C++ initialization is handled later. | |||
| 1217 | } else if (isa<ImplicitValueInitExpr>(expr)) { | |||
| 1218 | // This happens during template instantiation when we see an InitListExpr | |||
| 1219 | // that we've already checked once. | |||
| 1220 | assert(SemaRef.Context.hasSameType(expr->getType(), ElemType) &&(static_cast <bool> (SemaRef.Context.hasSameType(expr-> getType(), ElemType) && "found implicit initialization for the wrong type" ) ? void (0) : __assert_fail ("SemaRef.Context.hasSameType(expr->getType(), ElemType) && \"found implicit initialization for the wrong type\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 1221, __extension__ __PRETTY_FUNCTION__)) | |||
| 1221 | "found implicit initialization for the wrong type")(static_cast <bool> (SemaRef.Context.hasSameType(expr-> getType(), ElemType) && "found implicit initialization for the wrong type" ) ? void (0) : __assert_fail ("SemaRef.Context.hasSameType(expr->getType(), ElemType) && \"found implicit initialization for the wrong type\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 1221, __extension__ __PRETTY_FUNCTION__)); | |||
| 1222 | if (!VerifyOnly) | |||
| 1223 | UpdateStructuredListElement(StructuredList, StructuredIndex, expr); | |||
| 1224 | ++Index; | |||
| 1225 | return; | |||
| 1226 | } | |||
| 1227 | ||||
| 1228 | if (SemaRef.getLangOpts().CPlusPlus) { | |||
| 1229 | // C++ [dcl.init.aggr]p2: | |||
| 1230 | // Each member is copy-initialized from the corresponding | |||
| 1231 | // initializer-clause. | |||
| 1232 | ||||
| 1233 | // FIXME: Better EqualLoc? | |||
| 1234 | InitializationKind Kind = | |||
| 1235 | InitializationKind::CreateCopy(expr->getLocStart(), SourceLocation()); | |||
| 1236 | InitializationSequence Seq(SemaRef, Entity, Kind, expr, | |||
| 1237 | /*TopLevelOfInitList*/ true); | |||
| 1238 | ||||
| 1239 | // C++14 [dcl.init.aggr]p13: | |||
| 1240 | // If the assignment-expression can initialize a member, the member is | |||
| 1241 | // initialized. Otherwise [...] brace elision is assumed | |||
| 1242 | // | |||
| 1243 | // Brace elision is never performed if the element is not an | |||
| 1244 | // assignment-expression. | |||
| 1245 | if (Seq || isa<InitListExpr>(expr)) { | |||
| 1246 | if (!VerifyOnly) { | |||
| 1247 | ExprResult Result = | |||
| 1248 | Seq.Perform(SemaRef, Entity, Kind, expr); | |||
| 1249 | if (Result.isInvalid()) | |||
| 1250 | hadError = true; | |||
| 1251 | ||||
| 1252 | UpdateStructuredListElement(StructuredList, StructuredIndex, | |||
| 1253 | Result.getAs<Expr>()); | |||
| 1254 | } else if (!Seq) | |||
| 1255 | hadError = true; | |||
| 1256 | ++Index; | |||
| 1257 | return; | |||
| 1258 | } | |||
| 1259 | ||||
| 1260 | // Fall through for subaggregate initialization | |||
| 1261 | } else if (ElemType->isScalarType() || ElemType->isAtomicType()) { | |||
| 1262 | // FIXME: Need to handle atomic aggregate types with implicit init lists. | |||
| 1263 | return CheckScalarType(Entity, IList, ElemType, Index, | |||
| 1264 | StructuredList, StructuredIndex); | |||
| 1265 | } else if (const ArrayType *arrayType = | |||
| 1266 | SemaRef.Context.getAsArrayType(ElemType)) { | |||
| 1267 | // arrayType can be incomplete if we're initializing a flexible | |||
| 1268 | // array member. There's nothing we can do with the completed | |||
| 1269 | // type here, though. | |||
| 1270 | ||||
| 1271 | if (IsStringInit(expr, arrayType, SemaRef.Context) == SIF_None) { | |||
| 1272 | if (!VerifyOnly) { | |||
| 1273 | CheckStringInit(expr, ElemType, arrayType, SemaRef); | |||
| 1274 | UpdateStructuredListElement(StructuredList, StructuredIndex, expr); | |||
| 1275 | } | |||
| 1276 | ++Index; | |||
| 1277 | return; | |||
| 1278 | } | |||
| 1279 | ||||
| 1280 | // Fall through for subaggregate initialization. | |||
| 1281 | ||||
| 1282 | } else { | |||
| 1283 | assert((ElemType->isRecordType() || ElemType->isVectorType() ||(static_cast <bool> ((ElemType->isRecordType() || ElemType ->isVectorType() || ElemType->isOpenCLSpecificType()) && "Unexpected type") ? void (0) : __assert_fail ("(ElemType->isRecordType() || ElemType->isVectorType() || ElemType->isOpenCLSpecificType()) && \"Unexpected type\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 1284, __extension__ __PRETTY_FUNCTION__)) | |||
| 1284 | ElemType->isOpenCLSpecificType()) && "Unexpected type")(static_cast <bool> ((ElemType->isRecordType() || ElemType ->isVectorType() || ElemType->isOpenCLSpecificType()) && "Unexpected type") ? void (0) : __assert_fail ("(ElemType->isRecordType() || ElemType->isVectorType() || ElemType->isOpenCLSpecificType()) && \"Unexpected type\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 1284, __extension__ __PRETTY_FUNCTION__)); | |||
| 1285 | ||||
| 1286 | // C99 6.7.8p13: | |||
| 1287 | // | |||
| 1288 | // The initializer for a structure or union object that has | |||
| 1289 | // automatic storage duration shall be either an initializer | |||
| 1290 | // list as described below, or a single expression that has | |||
| 1291 | // compatible structure or union type. In the latter case, the | |||
| 1292 | // initial value of the object, including unnamed members, is | |||
| 1293 | // that of the expression. | |||
| 1294 | ExprResult ExprRes = expr; | |||
| 1295 | if (SemaRef.CheckSingleAssignmentConstraints( | |||
| 1296 | ElemType, ExprRes, !VerifyOnly) != Sema::Incompatible) { | |||
| 1297 | if (ExprRes.isInvalid()) | |||
| 1298 | hadError = true; | |||
| 1299 | else { | |||
| 1300 | ExprRes = SemaRef.DefaultFunctionArrayLvalueConversion(ExprRes.get()); | |||
| 1301 | if (ExprRes.isInvalid()) | |||
| 1302 | hadError = true; | |||
| 1303 | } | |||
| 1304 | UpdateStructuredListElement(StructuredList, StructuredIndex, | |||
| 1305 | ExprRes.getAs<Expr>()); | |||
| 1306 | ++Index; | |||
| 1307 | return; | |||
| 1308 | } | |||
| 1309 | ExprRes.get(); | |||
| 1310 | // Fall through for subaggregate initialization | |||
| 1311 | } | |||
| 1312 | ||||
| 1313 | // C++ [dcl.init.aggr]p12: | |||
| 1314 | // | |||
| 1315 | // [...] Otherwise, if the member is itself a non-empty | |||
| 1316 | // subaggregate, brace elision is assumed and the initializer is | |||
| 1317 | // considered for the initialization of the first member of | |||
| 1318 | // the subaggregate. | |||
| 1319 | // OpenCL vector initializer is handled elsewhere. | |||
| 1320 | if ((!SemaRef.getLangOpts().OpenCL && ElemType->isVectorType()) || | |||
| 1321 | ElemType->isAggregateType()) { | |||
| 1322 | CheckImplicitInitList(Entity, IList, ElemType, Index, StructuredList, | |||
| 1323 | StructuredIndex); | |||
| 1324 | ++StructuredIndex; | |||
| 1325 | } else { | |||
| 1326 | if (!VerifyOnly) { | |||
| 1327 | // We cannot initialize this element, so let | |||
| 1328 | // PerformCopyInitialization produce the appropriate diagnostic. | |||
| 1329 | SemaRef.PerformCopyInitialization(Entity, SourceLocation(), expr, | |||
| 1330 | /*TopLevelOfInitList=*/true); | |||
| 1331 | } | |||
| 1332 | hadError = true; | |||
| 1333 | ++Index; | |||
| 1334 | ++StructuredIndex; | |||
| 1335 | } | |||
| 1336 | } | |||
| 1337 | ||||
| 1338 | void InitListChecker::CheckComplexType(const InitializedEntity &Entity, | |||
| 1339 | InitListExpr *IList, QualType DeclType, | |||
| 1340 | unsigned &Index, | |||
| 1341 | InitListExpr *StructuredList, | |||
| 1342 | unsigned &StructuredIndex) { | |||
| 1343 | assert(Index == 0 && "Index in explicit init list must be zero")(static_cast <bool> (Index == 0 && "Index in explicit init list must be zero" ) ? void (0) : __assert_fail ("Index == 0 && \"Index in explicit init list must be zero\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 1343, __extension__ __PRETTY_FUNCTION__)); | |||
| 1344 | ||||
| 1345 | // As an extension, clang supports complex initializers, which initialize | |||
| 1346 | // a complex number component-wise. When an explicit initializer list for | |||
| 1347 | // a complex number contains two two initializers, this extension kicks in: | |||
| 1348 | // it exepcts the initializer list to contain two elements convertible to | |||
| 1349 | // the element type of the complex type. The first element initializes | |||
| 1350 | // the real part, and the second element intitializes the imaginary part. | |||
| 1351 | ||||
| 1352 | if (IList->getNumInits() != 2) | |||
| 1353 | return CheckScalarType(Entity, IList, DeclType, Index, StructuredList, | |||
| 1354 | StructuredIndex); | |||
| 1355 | ||||
| 1356 | // This is an extension in C. (The builtin _Complex type does not exist | |||
| 1357 | // in the C++ standard.) | |||
| 1358 | if (!SemaRef.getLangOpts().CPlusPlus && !VerifyOnly) | |||
| 1359 | SemaRef.Diag(IList->getLocStart(), diag::ext_complex_component_init) | |||
| 1360 | << IList->getSourceRange(); | |||
| 1361 | ||||
| 1362 | // Initialize the complex number. | |||
| 1363 | QualType elementType = DeclType->getAs<ComplexType>()->getElementType(); | |||
| 1364 | InitializedEntity ElementEntity = | |||
| 1365 | InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity); | |||
| 1366 | ||||
| 1367 | for (unsigned i = 0; i < 2; ++i) { | |||
| 1368 | ElementEntity.setElementIndex(Index); | |||
| 1369 | CheckSubElementType(ElementEntity, IList, elementType, Index, | |||
| 1370 | StructuredList, StructuredIndex); | |||
| 1371 | } | |||
| 1372 | } | |||
| 1373 | ||||
| 1374 | void InitListChecker::CheckScalarType(const InitializedEntity &Entity, | |||
| 1375 | InitListExpr *IList, QualType DeclType, | |||
| 1376 | unsigned &Index, | |||
| 1377 | InitListExpr *StructuredList, | |||
| 1378 | unsigned &StructuredIndex) { | |||
| 1379 | if (Index >= IList->getNumInits()) { | |||
| 1380 | if (!VerifyOnly) | |||
| 1381 | SemaRef.Diag(IList->getLocStart(), | |||
| 1382 | SemaRef.getLangOpts().CPlusPlus11 ? | |||
| 1383 | diag::warn_cxx98_compat_empty_scalar_initializer : | |||
| 1384 | diag::err_empty_scalar_initializer) | |||
| 1385 | << IList->getSourceRange(); | |||
| 1386 | hadError = !SemaRef.getLangOpts().CPlusPlus11; | |||
| 1387 | ++Index; | |||
| 1388 | ++StructuredIndex; | |||
| 1389 | return; | |||
| 1390 | } | |||
| 1391 | ||||
| 1392 | Expr *expr = IList->getInit(Index); | |||
| 1393 | if (InitListExpr *SubIList = dyn_cast<InitListExpr>(expr)) { | |||
| 1394 | // FIXME: This is invalid, and accepting it causes overload resolution | |||
| 1395 | // to pick the wrong overload in some corner cases. | |||
| 1396 | if (!VerifyOnly) | |||
| 1397 | SemaRef.Diag(SubIList->getLocStart(), | |||
| 1398 | diag::ext_many_braces_around_scalar_init) | |||
| 1399 | << SubIList->getSourceRange(); | |||
| 1400 | ||||
| 1401 | CheckScalarType(Entity, SubIList, DeclType, Index, StructuredList, | |||
| 1402 | StructuredIndex); | |||
| 1403 | return; | |||
| 1404 | } else if (isa<DesignatedInitExpr>(expr)) { | |||
| 1405 | if (!VerifyOnly) | |||
| 1406 | SemaRef.Diag(expr->getLocStart(), | |||
| 1407 | diag::err_designator_for_scalar_init) | |||
| 1408 | << DeclType << expr->getSourceRange(); | |||
| 1409 | hadError = true; | |||
| 1410 | ++Index; | |||
| 1411 | ++StructuredIndex; | |||
| 1412 | return; | |||
| 1413 | } | |||
| 1414 | ||||
| 1415 | if (VerifyOnly) { | |||
| 1416 | if (!SemaRef.CanPerformCopyInitialization(Entity,expr)) | |||
| 1417 | hadError = true; | |||
| 1418 | ++Index; | |||
| 1419 | return; | |||
| 1420 | } | |||
| 1421 | ||||
| 1422 | ExprResult Result = | |||
| 1423 | SemaRef.PerformCopyInitialization(Entity, expr->getLocStart(), expr, | |||
| 1424 | /*TopLevelOfInitList=*/true); | |||
| 1425 | ||||
| 1426 | Expr *ResultExpr = nullptr; | |||
| 1427 | ||||
| 1428 | if (Result.isInvalid()) | |||
| 1429 | hadError = true; // types weren't compatible. | |||
| 1430 | else { | |||
| 1431 | ResultExpr = Result.getAs<Expr>(); | |||
| 1432 | ||||
| 1433 | if (ResultExpr != expr) { | |||
| 1434 | // The type was promoted, update initializer list. | |||
| 1435 | IList->setInit(Index, ResultExpr); | |||
| 1436 | } | |||
| 1437 | } | |||
| 1438 | if (hadError) | |||
| 1439 | ++StructuredIndex; | |||
| 1440 | else | |||
| 1441 | UpdateStructuredListElement(StructuredList, StructuredIndex, ResultExpr); | |||
| 1442 | ++Index; | |||
| 1443 | } | |||
| 1444 | ||||
| 1445 | void InitListChecker::CheckReferenceType(const InitializedEntity &Entity, | |||
| 1446 | InitListExpr *IList, QualType DeclType, | |||
| 1447 | unsigned &Index, | |||
| 1448 | InitListExpr *StructuredList, | |||
| 1449 | unsigned &StructuredIndex) { | |||
| 1450 | if (Index >= IList->getNumInits()) { | |||
| 1451 | // FIXME: It would be wonderful if we could point at the actual member. In | |||
| 1452 | // general, it would be useful to pass location information down the stack, | |||
| 1453 | // so that we know the location (or decl) of the "current object" being | |||
| 1454 | // initialized. | |||
| 1455 | if (!VerifyOnly) | |||
| 1456 | SemaRef.Diag(IList->getLocStart(), | |||
| 1457 | diag::err_init_reference_member_uninitialized) | |||
| 1458 | << DeclType | |||
| 1459 | << IList->getSourceRange(); | |||
| 1460 | hadError = true; | |||
| 1461 | ++Index; | |||
| 1462 | ++StructuredIndex; | |||
| 1463 | return; | |||
| 1464 | } | |||
| 1465 | ||||
| 1466 | Expr *expr = IList->getInit(Index); | |||
| 1467 | if (isa<InitListExpr>(expr) && !SemaRef.getLangOpts().CPlusPlus11) { | |||
| 1468 | if (!VerifyOnly) | |||
| 1469 | SemaRef.Diag(IList->getLocStart(), diag::err_init_non_aggr_init_list) | |||
| 1470 | << DeclType << IList->getSourceRange(); | |||
| 1471 | hadError = true; | |||
| 1472 | ++Index; | |||
| 1473 | ++StructuredIndex; | |||
| 1474 | return; | |||
| 1475 | } | |||
| 1476 | ||||
| 1477 | if (VerifyOnly) { | |||
| 1478 | if (!SemaRef.CanPerformCopyInitialization(Entity,expr)) | |||
| 1479 | hadError = true; | |||
| 1480 | ++Index; | |||
| 1481 | return; | |||
| 1482 | } | |||
| 1483 | ||||
| 1484 | ExprResult Result = | |||
| 1485 | SemaRef.PerformCopyInitialization(Entity, expr->getLocStart(), expr, | |||
| 1486 | /*TopLevelOfInitList=*/true); | |||
| 1487 | ||||
| 1488 | if (Result.isInvalid()) | |||
| 1489 | hadError = true; | |||
| 1490 | ||||
| 1491 | expr = Result.getAs<Expr>(); | |||
| 1492 | IList->setInit(Index, expr); | |||
| 1493 | ||||
| 1494 | if (hadError) | |||
| 1495 | ++StructuredIndex; | |||
| 1496 | else | |||
| 1497 | UpdateStructuredListElement(StructuredList, StructuredIndex, expr); | |||
| 1498 | ++Index; | |||
| 1499 | } | |||
| 1500 | ||||
| 1501 | void InitListChecker::CheckVectorType(const InitializedEntity &Entity, | |||
| 1502 | InitListExpr *IList, QualType DeclType, | |||
| 1503 | unsigned &Index, | |||
| 1504 | InitListExpr *StructuredList, | |||
| 1505 | unsigned &StructuredIndex) { | |||
| 1506 | const VectorType *VT = DeclType->getAs<VectorType>(); | |||
| 1507 | unsigned maxElements = VT->getNumElements(); | |||
| 1508 | unsigned numEltsInit = 0; | |||
| 1509 | QualType elementType = VT->getElementType(); | |||
| 1510 | ||||
| 1511 | if (Index >= IList->getNumInits()) { | |||
| 1512 | // Make sure the element type can be value-initialized. | |||
| 1513 | if (VerifyOnly) | |||
| 1514 | CheckEmptyInitializable( | |||
| 1515 | InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity), | |||
| 1516 | IList->getLocEnd()); | |||
| 1517 | return; | |||
| 1518 | } | |||
| 1519 | ||||
| 1520 | if (!SemaRef.getLangOpts().OpenCL) { | |||
| 1521 | // If the initializing element is a vector, try to copy-initialize | |||
| 1522 | // instead of breaking it apart (which is doomed to failure anyway). | |||
| 1523 | Expr *Init = IList->getInit(Index); | |||
| 1524 | if (!isa<InitListExpr>(Init) && Init->getType()->isVectorType()) { | |||
| 1525 | if (VerifyOnly) { | |||
| 1526 | if (!SemaRef.CanPerformCopyInitialization(Entity, Init)) | |||
| 1527 | hadError = true; | |||
| 1528 | ++Index; | |||
| 1529 | return; | |||
| 1530 | } | |||
| 1531 | ||||
| 1532 | ExprResult Result = | |||
| 1533 | SemaRef.PerformCopyInitialization(Entity, Init->getLocStart(), Init, | |||
| 1534 | /*TopLevelOfInitList=*/true); | |||
| 1535 | ||||
| 1536 | Expr *ResultExpr = nullptr; | |||
| 1537 | if (Result.isInvalid()) | |||
| 1538 | hadError = true; // types weren't compatible. | |||
| 1539 | else { | |||
| 1540 | ResultExpr = Result.getAs<Expr>(); | |||
| 1541 | ||||
| 1542 | if (ResultExpr != Init) { | |||
| 1543 | // The type was promoted, update initializer list. | |||
| 1544 | IList->setInit(Index, ResultExpr); | |||
| 1545 | } | |||
| 1546 | } | |||
| 1547 | if (hadError) | |||
| 1548 | ++StructuredIndex; | |||
| 1549 | else | |||
| 1550 | UpdateStructuredListElement(StructuredList, StructuredIndex, | |||
| 1551 | ResultExpr); | |||
| 1552 | ++Index; | |||
| 1553 | return; | |||
| 1554 | } | |||
| 1555 | ||||
| 1556 | InitializedEntity ElementEntity = | |||
| 1557 | InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity); | |||
| 1558 | ||||
| 1559 | for (unsigned i = 0; i < maxElements; ++i, ++numEltsInit) { | |||
| 1560 | // Don't attempt to go past the end of the init list | |||
| 1561 | if (Index >= IList->getNumInits()) { | |||
| 1562 | if (VerifyOnly) | |||
| 1563 | CheckEmptyInitializable(ElementEntity, IList->getLocEnd()); | |||
| 1564 | break; | |||
| 1565 | } | |||
| 1566 | ||||
| 1567 | ElementEntity.setElementIndex(Index); | |||
| 1568 | CheckSubElementType(ElementEntity, IList, elementType, Index, | |||
| 1569 | StructuredList, StructuredIndex); | |||
| 1570 | } | |||
| 1571 | ||||
| 1572 | if (VerifyOnly) | |||
| 1573 | return; | |||
| 1574 | ||||
| 1575 | bool isBigEndian = SemaRef.Context.getTargetInfo().isBigEndian(); | |||
| 1576 | const VectorType *T = Entity.getType()->getAs<VectorType>(); | |||
| 1577 | if (isBigEndian && (T->getVectorKind() == VectorType::NeonVector || | |||
| 1578 | T->getVectorKind() == VectorType::NeonPolyVector)) { | |||
| 1579 | // The ability to use vector initializer lists is a GNU vector extension | |||
| 1580 | // and is unrelated to the NEON intrinsics in arm_neon.h. On little | |||
| 1581 | // endian machines it works fine, however on big endian machines it | |||
| 1582 | // exhibits surprising behaviour: | |||
| 1583 | // | |||
| 1584 | // uint32x2_t x = {42, 64}; | |||
| 1585 | // return vget_lane_u32(x, 0); // Will return 64. | |||
| 1586 | // | |||
| 1587 | // Because of this, explicitly call out that it is non-portable. | |||
| 1588 | // | |||
| 1589 | SemaRef.Diag(IList->getLocStart(), | |||
| 1590 | diag::warn_neon_vector_initializer_non_portable); | |||
| 1591 | ||||
| 1592 | const char *typeCode; | |||
| 1593 | unsigned typeSize = SemaRef.Context.getTypeSize(elementType); | |||
| 1594 | ||||
| 1595 | if (elementType->isFloatingType()) | |||
| 1596 | typeCode = "f"; | |||
| 1597 | else if (elementType->isSignedIntegerType()) | |||
| 1598 | typeCode = "s"; | |||
| 1599 | else if (elementType->isUnsignedIntegerType()) | |||
| 1600 | typeCode = "u"; | |||
| 1601 | else | |||
| 1602 | llvm_unreachable("Invalid element type!")::llvm::llvm_unreachable_internal("Invalid element type!", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 1602); | |||
| 1603 | ||||
| 1604 | SemaRef.Diag(IList->getLocStart(), | |||
| 1605 | SemaRef.Context.getTypeSize(VT) > 64 ? | |||
| 1606 | diag::note_neon_vector_initializer_non_portable_q : | |||
| 1607 | diag::note_neon_vector_initializer_non_portable) | |||
| 1608 | << typeCode << typeSize; | |||
| 1609 | } | |||
| 1610 | ||||
| 1611 | return; | |||
| 1612 | } | |||
| 1613 | ||||
| 1614 | InitializedEntity ElementEntity = | |||
| 1615 | InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity); | |||
| 1616 | ||||
| 1617 | // OpenCL initializers allows vectors to be constructed from vectors. | |||
| 1618 | for (unsigned i = 0; i < maxElements; ++i) { | |||
| 1619 | // Don't attempt to go past the end of the init list | |||
| 1620 | if (Index >= IList->getNumInits()) | |||
| 1621 | break; | |||
| 1622 | ||||
| 1623 | ElementEntity.setElementIndex(Index); | |||
| 1624 | ||||
| 1625 | QualType IType = IList->getInit(Index)->getType(); | |||
| 1626 | if (!IType->isVectorType()) { | |||
| 1627 | CheckSubElementType(ElementEntity, IList, elementType, Index, | |||
| 1628 | StructuredList, StructuredIndex); | |||
| 1629 | ++numEltsInit; | |||
| 1630 | } else { | |||
| 1631 | QualType VecType; | |||
| 1632 | const VectorType *IVT = IType->getAs<VectorType>(); | |||
| 1633 | unsigned numIElts = IVT->getNumElements(); | |||
| 1634 | ||||
| 1635 | if (IType->isExtVectorType()) | |||
| 1636 | VecType = SemaRef.Context.getExtVectorType(elementType, numIElts); | |||
| 1637 | else | |||
| 1638 | VecType = SemaRef.Context.getVectorType(elementType, numIElts, | |||
| 1639 | IVT->getVectorKind()); | |||
| 1640 | CheckSubElementType(ElementEntity, IList, VecType, Index, | |||
| 1641 | StructuredList, StructuredIndex); | |||
| 1642 | numEltsInit += numIElts; | |||
| 1643 | } | |||
| 1644 | } | |||
| 1645 | ||||
| 1646 | // OpenCL requires all elements to be initialized. | |||
| 1647 | if (numEltsInit != maxElements) { | |||
| 1648 | if (!VerifyOnly) | |||
| 1649 | SemaRef.Diag(IList->getLocStart(), | |||
| 1650 | diag::err_vector_incorrect_num_initializers) | |||
| 1651 | << (numEltsInit < maxElements) << maxElements << numEltsInit; | |||
| 1652 | hadError = true; | |||
| 1653 | } | |||
| 1654 | } | |||
| 1655 | ||||
| 1656 | void InitListChecker::CheckArrayType(const InitializedEntity &Entity, | |||
| 1657 | InitListExpr *IList, QualType &DeclType, | |||
| 1658 | llvm::APSInt elementIndex, | |||
| 1659 | bool SubobjectIsDesignatorContext, | |||
| 1660 | unsigned &Index, | |||
| 1661 | InitListExpr *StructuredList, | |||
| 1662 | unsigned &StructuredIndex) { | |||
| 1663 | const ArrayType *arrayType = SemaRef.Context.getAsArrayType(DeclType); | |||
| 1664 | ||||
| 1665 | // Check for the special-case of initializing an array with a string. | |||
| 1666 | if (Index < IList->getNumInits()) { | |||
| 1667 | if (IsStringInit(IList->getInit(Index), arrayType, SemaRef.Context) == | |||
| 1668 | SIF_None) { | |||
| 1669 | // We place the string literal directly into the resulting | |||
| 1670 | // initializer list. This is the only place where the structure | |||
| 1671 | // of the structured initializer list doesn't match exactly, | |||
| 1672 | // because doing so would involve allocating one character | |||
| 1673 | // constant for each string. | |||
| 1674 | if (!VerifyOnly) { | |||
| 1675 | CheckStringInit(IList->getInit(Index), DeclType, arrayType, SemaRef); | |||
| 1676 | UpdateStructuredListElement(StructuredList, StructuredIndex, | |||
| 1677 | IList->getInit(Index)); | |||
| 1678 | StructuredList->resizeInits(SemaRef.Context, StructuredIndex); | |||
| 1679 | } | |||
| 1680 | ++Index; | |||
| 1681 | return; | |||
| 1682 | } | |||
| 1683 | } | |||
| 1684 | if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(arrayType)) { | |||
| 1685 | // Check for VLAs; in standard C it would be possible to check this | |||
| 1686 | // earlier, but I don't know where clang accepts VLAs (gcc accepts | |||
| 1687 | // them in all sorts of strange places). | |||
| 1688 | if (!VerifyOnly) | |||
| 1689 | SemaRef.Diag(VAT->getSizeExpr()->getLocStart(), | |||
| 1690 | diag::err_variable_object_no_init) | |||
| 1691 | << VAT->getSizeExpr()->getSourceRange(); | |||
| 1692 | hadError = true; | |||
| 1693 | ++Index; | |||
| 1694 | ++StructuredIndex; | |||
| 1695 | return; | |||
| 1696 | } | |||
| 1697 | ||||
| 1698 | // We might know the maximum number of elements in advance. | |||
| 1699 | llvm::APSInt maxElements(elementIndex.getBitWidth(), | |||
| 1700 | elementIndex.isUnsigned()); | |||
| 1701 | bool maxElementsKnown = false; | |||
| 1702 | if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(arrayType)) { | |||
| 1703 | maxElements = CAT->getSize(); | |||
| 1704 | elementIndex = elementIndex.extOrTrunc(maxElements.getBitWidth()); | |||
| 1705 | elementIndex.setIsUnsigned(maxElements.isUnsigned()); | |||
| 1706 | maxElementsKnown = true; | |||
| 1707 | } | |||
| 1708 | ||||
| 1709 | QualType elementType = arrayType->getElementType(); | |||
| 1710 | while (Index < IList->getNumInits()) { | |||
| 1711 | Expr *Init = IList->getInit(Index); | |||
| 1712 | if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) { | |||
| 1713 | // If we're not the subobject that matches up with the '{' for | |||
| 1714 | // the designator, we shouldn't be handling the | |||
| 1715 | // designator. Return immediately. | |||
| 1716 | if (!SubobjectIsDesignatorContext) | |||
| 1717 | return; | |||
| 1718 | ||||
| 1719 | // Handle this designated initializer. elementIndex will be | |||
| 1720 | // updated to be the next array element we'll initialize. | |||
| 1721 | if (CheckDesignatedInitializer(Entity, IList, DIE, 0, | |||
| 1722 | DeclType, nullptr, &elementIndex, Index, | |||
| 1723 | StructuredList, StructuredIndex, true, | |||
| 1724 | false)) { | |||
| 1725 | hadError = true; | |||
| 1726 | continue; | |||
| 1727 | } | |||
| 1728 | ||||
| 1729 | if (elementIndex.getBitWidth() > maxElements.getBitWidth()) | |||
| 1730 | maxElements = maxElements.extend(elementIndex.getBitWidth()); | |||
| 1731 | else if (elementIndex.getBitWidth() < maxElements.getBitWidth()) | |||
| 1732 | elementIndex = elementIndex.extend(maxElements.getBitWidth()); | |||
| 1733 | elementIndex.setIsUnsigned(maxElements.isUnsigned()); | |||
| 1734 | ||||
| 1735 | // If the array is of incomplete type, keep track of the number of | |||
| 1736 | // elements in the initializer. | |||
| 1737 | if (!maxElementsKnown && elementIndex > maxElements) | |||
| 1738 | maxElements = elementIndex; | |||
| 1739 | ||||
| 1740 | continue; | |||
| 1741 | } | |||
| 1742 | ||||
| 1743 | // If we know the maximum number of elements, and we've already | |||
| 1744 | // hit it, stop consuming elements in the initializer list. | |||
| 1745 | if (maxElementsKnown && elementIndex == maxElements) | |||
| 1746 | break; | |||
| 1747 | ||||
| 1748 | InitializedEntity ElementEntity = | |||
| 1749 | InitializedEntity::InitializeElement(SemaRef.Context, StructuredIndex, | |||
| 1750 | Entity); | |||
| 1751 | // Check this element. | |||
| 1752 | CheckSubElementType(ElementEntity, IList, elementType, Index, | |||
| 1753 | StructuredList, StructuredIndex); | |||
| 1754 | ++elementIndex; | |||
| 1755 | ||||
| 1756 | // If the array is of incomplete type, keep track of the number of | |||
| 1757 | // elements in the initializer. | |||
| 1758 | if (!maxElementsKnown && elementIndex > maxElements) | |||
| 1759 | maxElements = elementIndex; | |||
| 1760 | } | |||
| 1761 | if (!hadError && DeclType->isIncompleteArrayType() && !VerifyOnly) { | |||
| 1762 | // If this is an incomplete array type, the actual type needs to | |||
| 1763 | // be calculated here. | |||
| 1764 | llvm::APSInt Zero(maxElements.getBitWidth(), maxElements.isUnsigned()); | |||
| 1765 | if (maxElements == Zero && !Entity.isVariableLengthArrayNew()) { | |||
| 1766 | // Sizing an array implicitly to zero is not allowed by ISO C, | |||
| 1767 | // but is supported by GNU. | |||
| 1768 | SemaRef.Diag(IList->getLocStart(), | |||
| 1769 | diag::ext_typecheck_zero_array_size); | |||
| 1770 | } | |||
| 1771 | ||||
| 1772 | DeclType = SemaRef.Context.getConstantArrayType(elementType, maxElements, | |||
| 1773 | ArrayType::Normal, 0); | |||
| 1774 | } | |||
| 1775 | if (!hadError && VerifyOnly) { | |||
| 1776 | // If there are any members of the array that get value-initialized, check | |||
| 1777 | // that is possible. That happens if we know the bound and don't have | |||
| 1778 | // enough elements, or if we're performing an array new with an unknown | |||
| 1779 | // bound. | |||
| 1780 | // FIXME: This needs to detect holes left by designated initializers too. | |||
| 1781 | if ((maxElementsKnown && elementIndex < maxElements) || | |||
| 1782 | Entity.isVariableLengthArrayNew()) | |||
| 1783 | CheckEmptyInitializable(InitializedEntity::InitializeElement( | |||
| 1784 | SemaRef.Context, 0, Entity), | |||
| 1785 | IList->getLocEnd()); | |||
| 1786 | } | |||
| 1787 | } | |||
| 1788 | ||||
| 1789 | bool InitListChecker::CheckFlexibleArrayInit(const InitializedEntity &Entity, | |||
| 1790 | Expr *InitExpr, | |||
| 1791 | FieldDecl *Field, | |||
| 1792 | bool TopLevelObject) { | |||
| 1793 | // Handle GNU flexible array initializers. | |||
| 1794 | unsigned FlexArrayDiag; | |||
| 1795 | if (isa<InitListExpr>(InitExpr) && | |||
| 1796 | cast<InitListExpr>(InitExpr)->getNumInits() == 0) { | |||
| 1797 | // Empty flexible array init always allowed as an extension | |||
| 1798 | FlexArrayDiag = diag::ext_flexible_array_init; | |||
| 1799 | } else if (SemaRef.getLangOpts().CPlusPlus) { | |||
| 1800 | // Disallow flexible array init in C++; it is not required for gcc | |||
| 1801 | // compatibility, and it needs work to IRGen correctly in general. | |||
| 1802 | FlexArrayDiag = diag::err_flexible_array_init; | |||
| 1803 | } else if (!TopLevelObject) { | |||
| 1804 | // Disallow flexible array init on non-top-level object | |||
| 1805 | FlexArrayDiag = diag::err_flexible_array_init; | |||
| 1806 | } else if (Entity.getKind() != InitializedEntity::EK_Variable) { | |||
| 1807 | // Disallow flexible array init on anything which is not a variable. | |||
| 1808 | FlexArrayDiag = diag::err_flexible_array_init; | |||
| 1809 | } else if (cast<VarDecl>(Entity.getDecl())->hasLocalStorage()) { | |||
| 1810 | // Disallow flexible array init on local variables. | |||
| 1811 | FlexArrayDiag = diag::err_flexible_array_init; | |||
| 1812 | } else { | |||
| 1813 | // Allow other cases. | |||
| 1814 | FlexArrayDiag = diag::ext_flexible_array_init; | |||
| 1815 | } | |||
| 1816 | ||||
| 1817 | if (!VerifyOnly) { | |||
| 1818 | SemaRef.Diag(InitExpr->getLocStart(), | |||
| 1819 | FlexArrayDiag) | |||
| 1820 | << InitExpr->getLocStart(); | |||
| 1821 | SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member) | |||
| 1822 | << Field; | |||
| 1823 | } | |||
| 1824 | ||||
| 1825 | return FlexArrayDiag != diag::ext_flexible_array_init; | |||
| 1826 | } | |||
| 1827 | ||||
| 1828 | void InitListChecker::CheckStructUnionTypes( | |||
| 1829 | const InitializedEntity &Entity, InitListExpr *IList, QualType DeclType, | |||
| 1830 | CXXRecordDecl::base_class_range Bases, RecordDecl::field_iterator Field, | |||
| 1831 | bool SubobjectIsDesignatorContext, unsigned &Index, | |||
| 1832 | InitListExpr *StructuredList, unsigned &StructuredIndex, | |||
| 1833 | bool TopLevelObject) { | |||
| 1834 | RecordDecl *structDecl = DeclType->getAs<RecordType>()->getDecl(); | |||
| 1835 | ||||
| 1836 | // If the record is invalid, some of it's members are invalid. To avoid | |||
| 1837 | // confusion, we forgo checking the intializer for the entire record. | |||
| 1838 | if (structDecl->isInvalidDecl()) { | |||
| 1839 | // Assume it was supposed to consume a single initializer. | |||
| 1840 | ++Index; | |||
| 1841 | hadError = true; | |||
| 1842 | return; | |||
| 1843 | } | |||
| 1844 | ||||
| 1845 | if (DeclType->isUnionType() && IList->getNumInits() == 0) { | |||
| 1846 | RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl(); | |||
| 1847 | ||||
| 1848 | // If there's a default initializer, use it. | |||
| 1849 | if (isa<CXXRecordDecl>(RD) && cast<CXXRecordDecl>(RD)->hasInClassInitializer()) { | |||
| 1850 | if (VerifyOnly) | |||
| 1851 | return; | |||
| 1852 | for (RecordDecl::field_iterator FieldEnd = RD->field_end(); | |||
| 1853 | Field != FieldEnd; ++Field) { | |||
| 1854 | if (Field->hasInClassInitializer()) { | |||
| 1855 | StructuredList->setInitializedFieldInUnion(*Field); | |||
| 1856 | // FIXME: Actually build a CXXDefaultInitExpr? | |||
| 1857 | return; | |||
| 1858 | } | |||
| 1859 | } | |||
| 1860 | } | |||
| 1861 | ||||
| 1862 | // Value-initialize the first member of the union that isn't an unnamed | |||
| 1863 | // bitfield. | |||
| 1864 | for (RecordDecl::field_iterator FieldEnd = RD->field_end(); | |||
| 1865 | Field != FieldEnd; ++Field) { | |||
| 1866 | if (!Field->isUnnamedBitfield()) { | |||
| 1867 | if (VerifyOnly) | |||
| 1868 | CheckEmptyInitializable( | |||
| 1869 | InitializedEntity::InitializeMember(*Field, &Entity), | |||
| 1870 | IList->getLocEnd()); | |||
| 1871 | else | |||
| 1872 | StructuredList->setInitializedFieldInUnion(*Field); | |||
| 1873 | break; | |||
| 1874 | } | |||
| 1875 | } | |||
| 1876 | return; | |||
| 1877 | } | |||
| 1878 | ||||
| 1879 | bool InitializedSomething = false; | |||
| 1880 | ||||
| 1881 | // If we have any base classes, they are initialized prior to the fields. | |||
| 1882 | for (auto &Base : Bases) { | |||
| 1883 | Expr *Init = Index < IList->getNumInits() ? IList->getInit(Index) : nullptr; | |||
| 1884 | SourceLocation InitLoc = Init ? Init->getLocStart() : IList->getLocEnd(); | |||
| 1885 | ||||
| 1886 | // Designated inits always initialize fields, so if we see one, all | |||
| 1887 | // remaining base classes have no explicit initializer. | |||
| 1888 | if (Init && isa<DesignatedInitExpr>(Init)) | |||
| 1889 | Init = nullptr; | |||
| 1890 | ||||
| 1891 | InitializedEntity BaseEntity = InitializedEntity::InitializeBase( | |||
| 1892 | SemaRef.Context, &Base, false, &Entity); | |||
| 1893 | if (Init) { | |||
| 1894 | CheckSubElementType(BaseEntity, IList, Base.getType(), Index, | |||
| 1895 | StructuredList, StructuredIndex); | |||
| 1896 | InitializedSomething = true; | |||
| 1897 | } else if (VerifyOnly) { | |||
| 1898 | CheckEmptyInitializable(BaseEntity, InitLoc); | |||
| 1899 | } | |||
| 1900 | } | |||
| 1901 | ||||
| 1902 | // If structDecl is a forward declaration, this loop won't do | |||
| 1903 | // anything except look at designated initializers; That's okay, | |||
| 1904 | // because an error should get printed out elsewhere. It might be | |||
| 1905 | // worthwhile to skip over the rest of the initializer, though. | |||
| 1906 | RecordDecl *RD = DeclType->getAs<RecordType>()->getDecl(); | |||
| 1907 | RecordDecl::field_iterator FieldEnd = RD->field_end(); | |||
| 1908 | bool CheckForMissingFields = | |||
| 1909 | !IList->isIdiomaticZeroInitializer(SemaRef.getLangOpts()); | |||
| 1910 | ||||
| 1911 | while (Index < IList->getNumInits()) { | |||
| 1912 | Expr *Init = IList->getInit(Index); | |||
| 1913 | ||||
| 1914 | if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) { | |||
| 1915 | // If we're not the subobject that matches up with the '{' for | |||
| 1916 | // the designator, we shouldn't be handling the | |||
| 1917 | // designator. Return immediately. | |||
| 1918 | if (!SubobjectIsDesignatorContext) | |||
| 1919 | return; | |||
| 1920 | ||||
| 1921 | // Handle this designated initializer. Field will be updated to | |||
| 1922 | // the next field that we'll be initializing. | |||
| 1923 | if (CheckDesignatedInitializer(Entity, IList, DIE, 0, | |||
| 1924 | DeclType, &Field, nullptr, Index, | |||
| 1925 | StructuredList, StructuredIndex, | |||
| 1926 | true, TopLevelObject)) | |||
| 1927 | hadError = true; | |||
| 1928 | ||||
| 1929 | InitializedSomething = true; | |||
| 1930 | ||||
| 1931 | // Disable check for missing fields when designators are used. | |||
| 1932 | // This matches gcc behaviour. | |||
| 1933 | CheckForMissingFields = false; | |||
| 1934 | continue; | |||
| 1935 | } | |||
| 1936 | ||||
| 1937 | if (Field == FieldEnd) { | |||
| 1938 | // We've run out of fields. We're done. | |||
| 1939 | break; | |||
| 1940 | } | |||
| 1941 | ||||
| 1942 | // We've already initialized a member of a union. We're done. | |||
| 1943 | if (InitializedSomething && DeclType->isUnionType()) | |||
| 1944 | break; | |||
| 1945 | ||||
| 1946 | // If we've hit the flexible array member at the end, we're done. | |||
| 1947 | if (Field->getType()->isIncompleteArrayType()) | |||
| 1948 | break; | |||
| 1949 | ||||
| 1950 | if (Field->isUnnamedBitfield()) { | |||
| 1951 | // Don't initialize unnamed bitfields, e.g. "int : 20;" | |||
| 1952 | ++Field; | |||
| 1953 | continue; | |||
| 1954 | } | |||
| 1955 | ||||
| 1956 | // Make sure we can use this declaration. | |||
| 1957 | bool InvalidUse; | |||
| 1958 | if (VerifyOnly) | |||
| 1959 | InvalidUse = !SemaRef.CanUseDecl(*Field, TreatUnavailableAsInvalid); | |||
| 1960 | else | |||
| 1961 | InvalidUse = SemaRef.DiagnoseUseOfDecl(*Field, | |||
| 1962 | IList->getInit(Index)->getLocStart()); | |||
| 1963 | if (InvalidUse) { | |||
| 1964 | ++Index; | |||
| 1965 | ++Field; | |||
| 1966 | hadError = true; | |||
| 1967 | continue; | |||
| 1968 | } | |||
| 1969 | ||||
| 1970 | InitializedEntity MemberEntity = | |||
| 1971 | InitializedEntity::InitializeMember(*Field, &Entity); | |||
| 1972 | CheckSubElementType(MemberEntity, IList, Field->getType(), Index, | |||
| 1973 | StructuredList, StructuredIndex); | |||
| 1974 | InitializedSomething = true; | |||
| 1975 | ||||
| 1976 | if (DeclType->isUnionType() && !VerifyOnly) { | |||
| 1977 | // Initialize the first field within the union. | |||
| 1978 | StructuredList->setInitializedFieldInUnion(*Field); | |||
| 1979 | } | |||
| 1980 | ||||
| 1981 | ++Field; | |||
| 1982 | } | |||
| 1983 | ||||
| 1984 | // Emit warnings for missing struct field initializers. | |||
| 1985 | if (!VerifyOnly && InitializedSomething && CheckForMissingFields && | |||
| 1986 | Field != FieldEnd && !Field->getType()->isIncompleteArrayType() && | |||
| 1987 | !DeclType->isUnionType()) { | |||
| 1988 | // It is possible we have one or more unnamed bitfields remaining. | |||
| 1989 | // Find first (if any) named field and emit warning. | |||
| 1990 | for (RecordDecl::field_iterator it = Field, end = RD->field_end(); | |||
| 1991 | it != end; ++it) { | |||
| 1992 | if (!it->isUnnamedBitfield() && !it->hasInClassInitializer()) { | |||
| 1993 | SemaRef.Diag(IList->getSourceRange().getEnd(), | |||
| 1994 | diag::warn_missing_field_initializers) << *it; | |||
| 1995 | break; | |||
| 1996 | } | |||
| 1997 | } | |||
| 1998 | } | |||
| 1999 | ||||
| 2000 | // Check that any remaining fields can be value-initialized. | |||
| 2001 | if (VerifyOnly && Field != FieldEnd && !DeclType->isUnionType() && | |||
| 2002 | !Field->getType()->isIncompleteArrayType()) { | |||
| 2003 | // FIXME: Should check for holes left by designated initializers too. | |||
| 2004 | for (; Field != FieldEnd && !hadError; ++Field) { | |||
| 2005 | if (!Field->isUnnamedBitfield() && !Field->hasInClassInitializer()) | |||
| 2006 | CheckEmptyInitializable( | |||
| 2007 | InitializedEntity::InitializeMember(*Field, &Entity), | |||
| 2008 | IList->getLocEnd()); | |||
| 2009 | } | |||
| 2010 | } | |||
| 2011 | ||||
| 2012 | if (Field == FieldEnd || !Field->getType()->isIncompleteArrayType() || | |||
| 2013 | Index >= IList->getNumInits()) | |||
| 2014 | return; | |||
| 2015 | ||||
| 2016 | if (CheckFlexibleArrayInit(Entity, IList->getInit(Index), *Field, | |||
| 2017 | TopLevelObject)) { | |||
| 2018 | hadError = true; | |||
| 2019 | ++Index; | |||
| 2020 | return; | |||
| 2021 | } | |||
| 2022 | ||||
| 2023 | InitializedEntity MemberEntity = | |||
| 2024 | InitializedEntity::InitializeMember(*Field, &Entity); | |||
| 2025 | ||||
| 2026 | if (isa<InitListExpr>(IList->getInit(Index))) | |||
| 2027 | CheckSubElementType(MemberEntity, IList, Field->getType(), Index, | |||
| 2028 | StructuredList, StructuredIndex); | |||
| 2029 | else | |||
| 2030 | CheckImplicitInitList(MemberEntity, IList, Field->getType(), Index, | |||
| 2031 | StructuredList, StructuredIndex); | |||
| 2032 | } | |||
| 2033 | ||||
| 2034 | /// Expand a field designator that refers to a member of an | |||
| 2035 | /// anonymous struct or union into a series of field designators that | |||
| 2036 | /// refers to the field within the appropriate subobject. | |||
| 2037 | /// | |||
| 2038 | static void ExpandAnonymousFieldDesignator(Sema &SemaRef, | |||
| 2039 | DesignatedInitExpr *DIE, | |||
| 2040 | unsigned DesigIdx, | |||
| 2041 | IndirectFieldDecl *IndirectField) { | |||
| 2042 | typedef DesignatedInitExpr::Designator Designator; | |||
| 2043 | ||||
| 2044 | // Build the replacement designators. | |||
| 2045 | SmallVector<Designator, 4> Replacements; | |||
| 2046 | for (IndirectFieldDecl::chain_iterator PI = IndirectField->chain_begin(), | |||
| 2047 | PE = IndirectField->chain_end(); PI != PE; ++PI) { | |||
| 2048 | if (PI + 1 == PE) | |||
| 2049 | Replacements.push_back(Designator((IdentifierInfo *)nullptr, | |||
| 2050 | DIE->getDesignator(DesigIdx)->getDotLoc(), | |||
| 2051 | DIE->getDesignator(DesigIdx)->getFieldLoc())); | |||
| 2052 | else | |||
| 2053 | Replacements.push_back(Designator((IdentifierInfo *)nullptr, | |||
| 2054 | SourceLocation(), SourceLocation())); | |||
| 2055 | assert(isa<FieldDecl>(*PI))(static_cast <bool> (isa<FieldDecl>(*PI)) ? void ( 0) : __assert_fail ("isa<FieldDecl>(*PI)", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 2055, __extension__ __PRETTY_FUNCTION__)); | |||
| 2056 | Replacements.back().setField(cast<FieldDecl>(*PI)); | |||
| 2057 | } | |||
| 2058 | ||||
| 2059 | // Expand the current designator into the set of replacement | |||
| 2060 | // designators, so we have a full subobject path down to where the | |||
| 2061 | // member of the anonymous struct/union is actually stored. | |||
| 2062 | DIE->ExpandDesignator(SemaRef.Context, DesigIdx, &Replacements[0], | |||
| 2063 | &Replacements[0] + Replacements.size()); | |||
| 2064 | } | |||
| 2065 | ||||
| 2066 | static DesignatedInitExpr *CloneDesignatedInitExpr(Sema &SemaRef, | |||
| 2067 | DesignatedInitExpr *DIE) { | |||
| 2068 | unsigned NumIndexExprs = DIE->getNumSubExprs() - 1; | |||
| 2069 | SmallVector<Expr*, 4> IndexExprs(NumIndexExprs); | |||
| 2070 | for (unsigned I = 0; I < NumIndexExprs; ++I) | |||
| 2071 | IndexExprs[I] = DIE->getSubExpr(I + 1); | |||
| 2072 | return DesignatedInitExpr::Create(SemaRef.Context, DIE->designators(), | |||
| 2073 | IndexExprs, | |||
| 2074 | DIE->getEqualOrColonLoc(), | |||
| 2075 | DIE->usesGNUSyntax(), DIE->getInit()); | |||
| 2076 | } | |||
| 2077 | ||||
| 2078 | namespace { | |||
| 2079 | ||||
| 2080 | // Callback to only accept typo corrections that are for field members of | |||
| 2081 | // the given struct or union. | |||
| 2082 | class FieldInitializerValidatorCCC : public CorrectionCandidateCallback { | |||
| 2083 | public: | |||
| 2084 | explicit FieldInitializerValidatorCCC(RecordDecl *RD) | |||
| 2085 | : Record(RD) {} | |||
| 2086 | ||||
| 2087 | bool ValidateCandidate(const TypoCorrection &candidate) override { | |||
| 2088 | FieldDecl *FD = candidate.getCorrectionDeclAs<FieldDecl>(); | |||
| 2089 | return FD && FD->getDeclContext()->getRedeclContext()->Equals(Record); | |||
| 2090 | } | |||
| 2091 | ||||
| 2092 | private: | |||
| 2093 | RecordDecl *Record; | |||
| 2094 | }; | |||
| 2095 | ||||
| 2096 | } // end anonymous namespace | |||
| 2097 | ||||
| 2098 | /// Check the well-formedness of a C99 designated initializer. | |||
| 2099 | /// | |||
| 2100 | /// Determines whether the designated initializer @p DIE, which | |||
| 2101 | /// resides at the given @p Index within the initializer list @p | |||
| 2102 | /// IList, is well-formed for a current object of type @p DeclType | |||
| 2103 | /// (C99 6.7.8). The actual subobject that this designator refers to | |||
| 2104 | /// within the current subobject is returned in either | |||
| 2105 | /// @p NextField or @p NextElementIndex (whichever is appropriate). | |||
| 2106 | /// | |||
| 2107 | /// @param IList The initializer list in which this designated | |||
| 2108 | /// initializer occurs. | |||
| 2109 | /// | |||
| 2110 | /// @param DIE The designated initializer expression. | |||
| 2111 | /// | |||
| 2112 | /// @param DesigIdx The index of the current designator. | |||
| 2113 | /// | |||
| 2114 | /// @param CurrentObjectType The type of the "current object" (C99 6.7.8p17), | |||
| 2115 | /// into which the designation in @p DIE should refer. | |||
| 2116 | /// | |||
| 2117 | /// @param NextField If non-NULL and the first designator in @p DIE is | |||
| 2118 | /// a field, this will be set to the field declaration corresponding | |||
| 2119 | /// to the field named by the designator. | |||
| 2120 | /// | |||
| 2121 | /// @param NextElementIndex If non-NULL and the first designator in @p | |||
| 2122 | /// DIE is an array designator or GNU array-range designator, this | |||
| 2123 | /// will be set to the last index initialized by this designator. | |||
| 2124 | /// | |||
| 2125 | /// @param Index Index into @p IList where the designated initializer | |||
| 2126 | /// @p DIE occurs. | |||
| 2127 | /// | |||
| 2128 | /// @param StructuredList The initializer list expression that | |||
| 2129 | /// describes all of the subobject initializers in the order they'll | |||
| 2130 | /// actually be initialized. | |||
| 2131 | /// | |||
| 2132 | /// @returns true if there was an error, false otherwise. | |||
| 2133 | bool | |||
| 2134 | InitListChecker::CheckDesignatedInitializer(const InitializedEntity &Entity, | |||
| 2135 | InitListExpr *IList, | |||
| 2136 | DesignatedInitExpr *DIE, | |||
| 2137 | unsigned DesigIdx, | |||
| 2138 | QualType &CurrentObjectType, | |||
| 2139 | RecordDecl::field_iterator *NextField, | |||
| 2140 | llvm::APSInt *NextElementIndex, | |||
| 2141 | unsigned &Index, | |||
| 2142 | InitListExpr *StructuredList, | |||
| 2143 | unsigned &StructuredIndex, | |||
| 2144 | bool FinishSubobjectInit, | |||
| 2145 | bool TopLevelObject) { | |||
| 2146 | if (DesigIdx == DIE->size()) { | |||
| 2147 | // Check the actual initialization for the designated object type. | |||
| 2148 | bool prevHadError = hadError; | |||
| 2149 | ||||
| 2150 | // Temporarily remove the designator expression from the | |||
| 2151 | // initializer list that the child calls see, so that we don't try | |||
| 2152 | // to re-process the designator. | |||
| 2153 | unsigned OldIndex = Index; | |||
| 2154 | IList->setInit(OldIndex, DIE->getInit()); | |||
| 2155 | ||||
| 2156 | CheckSubElementType(Entity, IList, CurrentObjectType, Index, | |||
| 2157 | StructuredList, StructuredIndex); | |||
| 2158 | ||||
| 2159 | // Restore the designated initializer expression in the syntactic | |||
| 2160 | // form of the initializer list. | |||
| 2161 | if (IList->getInit(OldIndex) != DIE->getInit()) | |||
| 2162 | DIE->setInit(IList->getInit(OldIndex)); | |||
| 2163 | IList->setInit(OldIndex, DIE); | |||
| 2164 | ||||
| 2165 | return hadError && !prevHadError; | |||
| 2166 | } | |||
| 2167 | ||||
| 2168 | DesignatedInitExpr::Designator *D = DIE->getDesignator(DesigIdx); | |||
| 2169 | bool IsFirstDesignator = (DesigIdx == 0); | |||
| 2170 | if (!VerifyOnly) { | |||
| 2171 | assert((IsFirstDesignator || StructuredList) &&(static_cast <bool> ((IsFirstDesignator || StructuredList ) && "Need a non-designated initializer list to start from" ) ? void (0) : __assert_fail ("(IsFirstDesignator || StructuredList) && \"Need a non-designated initializer list to start from\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 2172, __extension__ __PRETTY_FUNCTION__)) | |||
| 2172 | "Need a non-designated initializer list to start from")(static_cast <bool> ((IsFirstDesignator || StructuredList ) && "Need a non-designated initializer list to start from" ) ? void (0) : __assert_fail ("(IsFirstDesignator || StructuredList) && \"Need a non-designated initializer list to start from\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 2172, __extension__ __PRETTY_FUNCTION__)); | |||
| 2173 | ||||
| 2174 | // Determine the structural initializer list that corresponds to the | |||
| 2175 | // current subobject. | |||
| 2176 | if (IsFirstDesignator) | |||
| 2177 | StructuredList = SyntacticToSemantic.lookup(IList); | |||
| 2178 | else { | |||
| 2179 | Expr *ExistingInit = StructuredIndex < StructuredList->getNumInits() ? | |||
| 2180 | StructuredList->getInit(StructuredIndex) : nullptr; | |||
| 2181 | if (!ExistingInit && StructuredList->hasArrayFiller()) | |||
| 2182 | ExistingInit = StructuredList->getArrayFiller(); | |||
| 2183 | ||||
| 2184 | if (!ExistingInit) | |||
| 2185 | StructuredList = | |||
| 2186 | getStructuredSubobjectInit(IList, Index, CurrentObjectType, | |||
| 2187 | StructuredList, StructuredIndex, | |||
| 2188 | SourceRange(D->getLocStart(), | |||
| 2189 | DIE->getLocEnd())); | |||
| 2190 | else if (InitListExpr *Result = dyn_cast<InitListExpr>(ExistingInit)) | |||
| 2191 | StructuredList = Result; | |||
| 2192 | else { | |||
| 2193 | if (DesignatedInitUpdateExpr *E = | |||
| 2194 | dyn_cast<DesignatedInitUpdateExpr>(ExistingInit)) | |||
| 2195 | StructuredList = E->getUpdater(); | |||
| 2196 | else { | |||
| 2197 | DesignatedInitUpdateExpr *DIUE = | |||
| 2198 | new (SemaRef.Context) DesignatedInitUpdateExpr(SemaRef.Context, | |||
| 2199 | D->getLocStart(), ExistingInit, | |||
| 2200 | DIE->getLocEnd()); | |||
| 2201 | StructuredList->updateInit(SemaRef.Context, StructuredIndex, DIUE); | |||
| 2202 | StructuredList = DIUE->getUpdater(); | |||
| 2203 | } | |||
| 2204 | ||||
| 2205 | // We need to check on source range validity because the previous | |||
| 2206 | // initializer does not have to be an explicit initializer. e.g., | |||
| 2207 | // | |||
| 2208 | // struct P { int a, b; }; | |||
| 2209 | // struct PP { struct P p } l = { { .a = 2 }, .p.b = 3 }; | |||
| 2210 | // | |||
| 2211 | // There is an overwrite taking place because the first braced initializer | |||
| 2212 | // list "{ .a = 2 }" already provides value for .p.b (which is zero). | |||
| 2213 | if (ExistingInit->getSourceRange().isValid()) { | |||
| 2214 | // We are creating an initializer list that initializes the | |||
| 2215 | // subobjects of the current object, but there was already an | |||
| 2216 | // initialization that completely initialized the current | |||
| 2217 | // subobject, e.g., by a compound literal: | |||
| 2218 | // | |||
| 2219 | // struct X { int a, b; }; | |||
| 2220 | // struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 }; | |||
| 2221 | // | |||
| 2222 | // Here, xs[0].a == 0 and xs[0].b == 3, since the second, | |||
| 2223 | // designated initializer re-initializes the whole | |||
| 2224 | // subobject [0], overwriting previous initializers. | |||
| 2225 | SemaRef.Diag(D->getLocStart(), | |||
| 2226 | diag::warn_subobject_initializer_overrides) | |||
| 2227 | << SourceRange(D->getLocStart(), DIE->getLocEnd()); | |||
| 2228 | ||||
| 2229 | SemaRef.Diag(ExistingInit->getLocStart(), | |||
| 2230 | diag::note_previous_initializer) | |||
| 2231 | << /*FIXME:has side effects=*/0 | |||
| 2232 | << ExistingInit->getSourceRange(); | |||
| 2233 | } | |||
| 2234 | } | |||
| 2235 | } | |||
| 2236 | assert(StructuredList && "Expected a structured initializer list")(static_cast <bool> (StructuredList && "Expected a structured initializer list" ) ? void (0) : __assert_fail ("StructuredList && \"Expected a structured initializer list\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 2236, __extension__ __PRETTY_FUNCTION__)); | |||
| 2237 | } | |||
| 2238 | ||||
| 2239 | if (D->isFieldDesignator()) { | |||
| 2240 | // C99 6.7.8p7: | |||
| 2241 | // | |||
| 2242 | // If a designator has the form | |||
| 2243 | // | |||
| 2244 | // . identifier | |||
| 2245 | // | |||
| 2246 | // then the current object (defined below) shall have | |||
| 2247 | // structure or union type and the identifier shall be the | |||
| 2248 | // name of a member of that type. | |||
| 2249 | const RecordType *RT = CurrentObjectType->getAs<RecordType>(); | |||
| 2250 | if (!RT) { | |||
| 2251 | SourceLocation Loc = D->getDotLoc(); | |||
| 2252 | if (Loc.isInvalid()) | |||
| 2253 | Loc = D->getFieldLoc(); | |||
| 2254 | if (!VerifyOnly) | |||
| 2255 | SemaRef.Diag(Loc, diag::err_field_designator_non_aggr) | |||
| 2256 | << SemaRef.getLangOpts().CPlusPlus << CurrentObjectType; | |||
| 2257 | ++Index; | |||
| 2258 | return true; | |||
| 2259 | } | |||
| 2260 | ||||
| 2261 | FieldDecl *KnownField = D->getField(); | |||
| 2262 | if (!KnownField) { | |||
| 2263 | IdentifierInfo *FieldName = D->getFieldName(); | |||
| 2264 | DeclContext::lookup_result Lookup = RT->getDecl()->lookup(FieldName); | |||
| 2265 | for (NamedDecl *ND : Lookup) { | |||
| 2266 | if (auto *FD = dyn_cast<FieldDecl>(ND)) { | |||
| 2267 | KnownField = FD; | |||
| 2268 | break; | |||
| 2269 | } | |||
| 2270 | if (auto *IFD = dyn_cast<IndirectFieldDecl>(ND)) { | |||
| 2271 | // In verify mode, don't modify the original. | |||
| 2272 | if (VerifyOnly) | |||
| 2273 | DIE = CloneDesignatedInitExpr(SemaRef, DIE); | |||
| 2274 | ExpandAnonymousFieldDesignator(SemaRef, DIE, DesigIdx, IFD); | |||
| 2275 | D = DIE->getDesignator(DesigIdx); | |||
| 2276 | KnownField = cast<FieldDecl>(*IFD->chain_begin()); | |||
| 2277 | break; | |||
| 2278 | } | |||
| 2279 | } | |||
| 2280 | if (!KnownField) { | |||
| 2281 | if (VerifyOnly) { | |||
| 2282 | ++Index; | |||
| 2283 | return true; // No typo correction when just trying this out. | |||
| 2284 | } | |||
| 2285 | ||||
| 2286 | // Name lookup found something, but it wasn't a field. | |||
| 2287 | if (!Lookup.empty()) { | |||
| 2288 | SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_nonfield) | |||
| 2289 | << FieldName; | |||
| 2290 | SemaRef.Diag(Lookup.front()->getLocation(), | |||
| 2291 | diag::note_field_designator_found); | |||
| 2292 | ++Index; | |||
| 2293 | return true; | |||
| 2294 | } | |||
| 2295 | ||||
| 2296 | // Name lookup didn't find anything. | |||
| 2297 | // Determine whether this was a typo for another field name. | |||
| 2298 | if (TypoCorrection Corrected = SemaRef.CorrectTypo( | |||
| 2299 | DeclarationNameInfo(FieldName, D->getFieldLoc()), | |||
| 2300 | Sema::LookupMemberName, /*Scope=*/nullptr, /*SS=*/nullptr, | |||
| 2301 | llvm::make_unique<FieldInitializerValidatorCCC>(RT->getDecl()), | |||
| 2302 | Sema::CTK_ErrorRecovery, RT->getDecl())) { | |||
| 2303 | SemaRef.diagnoseTypo( | |||
| 2304 | Corrected, | |||
| 2305 | SemaRef.PDiag(diag::err_field_designator_unknown_suggest) | |||
| 2306 | << FieldName << CurrentObjectType); | |||
| 2307 | KnownField = Corrected.getCorrectionDeclAs<FieldDecl>(); | |||
| 2308 | hadError = true; | |||
| 2309 | } else { | |||
| 2310 | // Typo correction didn't find anything. | |||
| 2311 | SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_unknown) | |||
| 2312 | << FieldName << CurrentObjectType; | |||
| 2313 | ++Index; | |||
| 2314 | return true; | |||
| 2315 | } | |||
| 2316 | } | |||
| 2317 | } | |||
| 2318 | ||||
| 2319 | unsigned FieldIndex = 0; | |||
| 2320 | ||||
| 2321 | if (auto *CXXRD = dyn_cast<CXXRecordDecl>(RT->getDecl())) | |||
| 2322 | FieldIndex = CXXRD->getNumBases(); | |||
| 2323 | ||||
| 2324 | for (auto *FI : RT->getDecl()->fields()) { | |||
| 2325 | if (FI->isUnnamedBitfield()) | |||
| 2326 | continue; | |||
| 2327 | if (declaresSameEntity(KnownField, FI)) { | |||
| 2328 | KnownField = FI; | |||
| 2329 | break; | |||
| 2330 | } | |||
| 2331 | ++FieldIndex; | |||
| 2332 | } | |||
| 2333 | ||||
| 2334 | RecordDecl::field_iterator Field = | |||
| 2335 | RecordDecl::field_iterator(DeclContext::decl_iterator(KnownField)); | |||
| 2336 | ||||
| 2337 | // All of the fields of a union are located at the same place in | |||
| 2338 | // the initializer list. | |||
| 2339 | if (RT->getDecl()->isUnion()) { | |||
| 2340 | FieldIndex = 0; | |||
| 2341 | if (!VerifyOnly) { | |||
| 2342 | FieldDecl *CurrentField = StructuredList->getInitializedFieldInUnion(); | |||
| 2343 | if (CurrentField && !declaresSameEntity(CurrentField, *Field)) { | |||
| 2344 | assert(StructuredList->getNumInits() == 1(static_cast <bool> (StructuredList->getNumInits() == 1 && "A union should never have more than one initializer!" ) ? void (0) : __assert_fail ("StructuredList->getNumInits() == 1 && \"A union should never have more than one initializer!\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 2345, __extension__ __PRETTY_FUNCTION__)) | |||
| 2345 | && "A union should never have more than one initializer!")(static_cast <bool> (StructuredList->getNumInits() == 1 && "A union should never have more than one initializer!" ) ? void (0) : __assert_fail ("StructuredList->getNumInits() == 1 && \"A union should never have more than one initializer!\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 2345, __extension__ __PRETTY_FUNCTION__)); | |||
| 2346 | ||||
| 2347 | Expr *ExistingInit = StructuredList->getInit(0); | |||
| 2348 | if (ExistingInit) { | |||
| 2349 | // We're about to throw away an initializer, emit warning. | |||
| 2350 | SemaRef.Diag(D->getFieldLoc(), | |||
| 2351 | diag::warn_initializer_overrides) | |||
| 2352 | << D->getSourceRange(); | |||
| 2353 | SemaRef.Diag(ExistingInit->getLocStart(), | |||
| 2354 | diag::note_previous_initializer) | |||
| 2355 | << /*FIXME:has side effects=*/0 | |||
| 2356 | << ExistingInit->getSourceRange(); | |||
| 2357 | } | |||
| 2358 | ||||
| 2359 | // remove existing initializer | |||
| 2360 | StructuredList->resizeInits(SemaRef.Context, 0); | |||
| 2361 | StructuredList->setInitializedFieldInUnion(nullptr); | |||
| 2362 | } | |||
| 2363 | ||||
| 2364 | StructuredList->setInitializedFieldInUnion(*Field); | |||
| 2365 | } | |||
| 2366 | } | |||
| 2367 | ||||
| 2368 | // Make sure we can use this declaration. | |||
| 2369 | bool InvalidUse; | |||
| 2370 | if (VerifyOnly) | |||
| 2371 | InvalidUse = !SemaRef.CanUseDecl(*Field, TreatUnavailableAsInvalid); | |||
| 2372 | else | |||
| 2373 | InvalidUse = SemaRef.DiagnoseUseOfDecl(*Field, D->getFieldLoc()); | |||
| 2374 | if (InvalidUse) { | |||
| 2375 | ++Index; | |||
| 2376 | return true; | |||
| 2377 | } | |||
| 2378 | ||||
| 2379 | if (!VerifyOnly) { | |||
| 2380 | // Update the designator with the field declaration. | |||
| 2381 | D->setField(*Field); | |||
| 2382 | ||||
| 2383 | // Make sure that our non-designated initializer list has space | |||
| 2384 | // for a subobject corresponding to this field. | |||
| 2385 | if (FieldIndex >= StructuredList->getNumInits()) | |||
| 2386 | StructuredList->resizeInits(SemaRef.Context, FieldIndex + 1); | |||
| 2387 | } | |||
| 2388 | ||||
| 2389 | // This designator names a flexible array member. | |||
| 2390 | if (Field->getType()->isIncompleteArrayType()) { | |||
| 2391 | bool Invalid = false; | |||
| 2392 | if ((DesigIdx + 1) != DIE->size()) { | |||
| 2393 | // We can't designate an object within the flexible array | |||
| 2394 | // member (because GCC doesn't allow it). | |||
| 2395 | if (!VerifyOnly) { | |||
| 2396 | DesignatedInitExpr::Designator *NextD | |||
| 2397 | = DIE->getDesignator(DesigIdx + 1); | |||
| 2398 | SemaRef.Diag(NextD->getLocStart(), | |||
| 2399 | diag::err_designator_into_flexible_array_member) | |||
| 2400 | << SourceRange(NextD->getLocStart(), | |||
| 2401 | DIE->getLocEnd()); | |||
| 2402 | SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member) | |||
| 2403 | << *Field; | |||
| 2404 | } | |||
| 2405 | Invalid = true; | |||
| 2406 | } | |||
| 2407 | ||||
| 2408 | if (!hadError && !isa<InitListExpr>(DIE->getInit()) && | |||
| 2409 | !isa<StringLiteral>(DIE->getInit())) { | |||
| 2410 | // The initializer is not an initializer list. | |||
| 2411 | if (!VerifyOnly) { | |||
| 2412 | SemaRef.Diag(DIE->getInit()->getLocStart(), | |||
| 2413 | diag::err_flexible_array_init_needs_braces) | |||
| 2414 | << DIE->getInit()->getSourceRange(); | |||
| 2415 | SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member) | |||
| 2416 | << *Field; | |||
| 2417 | } | |||
| 2418 | Invalid = true; | |||
| 2419 | } | |||
| 2420 | ||||
| 2421 | // Check GNU flexible array initializer. | |||
| 2422 | if (!Invalid && CheckFlexibleArrayInit(Entity, DIE->getInit(), *Field, | |||
| 2423 | TopLevelObject)) | |||
| 2424 | Invalid = true; | |||
| 2425 | ||||
| 2426 | if (Invalid) { | |||
| 2427 | ++Index; | |||
| 2428 | return true; | |||
| 2429 | } | |||
| 2430 | ||||
| 2431 | // Initialize the array. | |||
| 2432 | bool prevHadError = hadError; | |||
| 2433 | unsigned newStructuredIndex = FieldIndex; | |||
| 2434 | unsigned OldIndex = Index; | |||
| 2435 | IList->setInit(Index, DIE->getInit()); | |||
| 2436 | ||||
| 2437 | InitializedEntity MemberEntity = | |||
| 2438 | InitializedEntity::InitializeMember(*Field, &Entity); | |||
| 2439 | CheckSubElementType(MemberEntity, IList, Field->getType(), Index, | |||
| 2440 | StructuredList, newStructuredIndex); | |||
| 2441 | ||||
| 2442 | IList->setInit(OldIndex, DIE); | |||
| 2443 | if (hadError && !prevHadError) { | |||
| 2444 | ++Field; | |||
| 2445 | ++FieldIndex; | |||
| 2446 | if (NextField) | |||
| 2447 | *NextField = Field; | |||
| 2448 | StructuredIndex = FieldIndex; | |||
| 2449 | return true; | |||
| 2450 | } | |||
| 2451 | } else { | |||
| 2452 | // Recurse to check later designated subobjects. | |||
| 2453 | QualType FieldType = Field->getType(); | |||
| 2454 | unsigned newStructuredIndex = FieldIndex; | |||
| 2455 | ||||
| 2456 | InitializedEntity MemberEntity = | |||
| 2457 | InitializedEntity::InitializeMember(*Field, &Entity); | |||
| 2458 | if (CheckDesignatedInitializer(MemberEntity, IList, DIE, DesigIdx + 1, | |||
| 2459 | FieldType, nullptr, nullptr, Index, | |||
| 2460 | StructuredList, newStructuredIndex, | |||
| 2461 | FinishSubobjectInit, false)) | |||
| 2462 | return true; | |||
| 2463 | } | |||
| 2464 | ||||
| 2465 | // Find the position of the next field to be initialized in this | |||
| 2466 | // subobject. | |||
| 2467 | ++Field; | |||
| 2468 | ++FieldIndex; | |||
| 2469 | ||||
| 2470 | // If this the first designator, our caller will continue checking | |||
| 2471 | // the rest of this struct/class/union subobject. | |||
| 2472 | if (IsFirstDesignator) { | |||
| 2473 | if (NextField) | |||
| 2474 | *NextField = Field; | |||
| 2475 | StructuredIndex = FieldIndex; | |||
| 2476 | return false; | |||
| 2477 | } | |||
| 2478 | ||||
| 2479 | if (!FinishSubobjectInit) | |||
| 2480 | return false; | |||
| 2481 | ||||
| 2482 | // We've already initialized something in the union; we're done. | |||
| 2483 | if (RT->getDecl()->isUnion()) | |||
| 2484 | return hadError; | |||
| 2485 | ||||
| 2486 | // Check the remaining fields within this class/struct/union subobject. | |||
| 2487 | bool prevHadError = hadError; | |||
| 2488 | ||||
| 2489 | auto NoBases = | |||
| 2490 | CXXRecordDecl::base_class_range(CXXRecordDecl::base_class_iterator(), | |||
| 2491 | CXXRecordDecl::base_class_iterator()); | |||
| 2492 | CheckStructUnionTypes(Entity, IList, CurrentObjectType, NoBases, Field, | |||
| 2493 | false, Index, StructuredList, FieldIndex); | |||
| 2494 | return hadError && !prevHadError; | |||
| 2495 | } | |||
| 2496 | ||||
| 2497 | // C99 6.7.8p6: | |||
| 2498 | // | |||
| 2499 | // If a designator has the form | |||
| 2500 | // | |||
| 2501 | // [ constant-expression ] | |||
| 2502 | // | |||
| 2503 | // then the current object (defined below) shall have array | |||
| 2504 | // type and the expression shall be an integer constant | |||
| 2505 | // expression. If the array is of unknown size, any | |||
| 2506 | // nonnegative value is valid. | |||
| 2507 | // | |||
| 2508 | // Additionally, cope with the GNU extension that permits | |||
| 2509 | // designators of the form | |||
| 2510 | // | |||
| 2511 | // [ constant-expression ... constant-expression ] | |||
| 2512 | const ArrayType *AT = SemaRef.Context.getAsArrayType(CurrentObjectType); | |||
| 2513 | if (!AT) { | |||
| 2514 | if (!VerifyOnly) | |||
| 2515 | SemaRef.Diag(D->getLBracketLoc(), diag::err_array_designator_non_array) | |||
| 2516 | << CurrentObjectType; | |||
| 2517 | ++Index; | |||
| 2518 | return true; | |||
| 2519 | } | |||
| 2520 | ||||
| 2521 | Expr *IndexExpr = nullptr; | |||
| 2522 | llvm::APSInt DesignatedStartIndex, DesignatedEndIndex; | |||
| 2523 | if (D->isArrayDesignator()) { | |||
| 2524 | IndexExpr = DIE->getArrayIndex(*D); | |||
| 2525 | DesignatedStartIndex = IndexExpr->EvaluateKnownConstInt(SemaRef.Context); | |||
| 2526 | DesignatedEndIndex = DesignatedStartIndex; | |||
| 2527 | } else { | |||
| 2528 | assert(D->isArrayRangeDesignator() && "Need array-range designator")(static_cast <bool> (D->isArrayRangeDesignator() && "Need array-range designator") ? void (0) : __assert_fail ("D->isArrayRangeDesignator() && \"Need array-range designator\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 2528, __extension__ __PRETTY_FUNCTION__)); | |||
| 2529 | ||||
| 2530 | DesignatedStartIndex = | |||
| 2531 | DIE->getArrayRangeStart(*D)->EvaluateKnownConstInt(SemaRef.Context); | |||
| 2532 | DesignatedEndIndex = | |||
| 2533 | DIE->getArrayRangeEnd(*D)->EvaluateKnownConstInt(SemaRef.Context); | |||
| 2534 | IndexExpr = DIE->getArrayRangeEnd(*D); | |||
| 2535 | ||||
| 2536 | // Codegen can't handle evaluating array range designators that have side | |||
| 2537 | // effects, because we replicate the AST value for each initialized element. | |||
| 2538 | // As such, set the sawArrayRangeDesignator() bit if we initialize multiple | |||
| 2539 | // elements with something that has a side effect, so codegen can emit an | |||
| 2540 | // "error unsupported" error instead of miscompiling the app. | |||
| 2541 | if (DesignatedStartIndex.getZExtValue()!=DesignatedEndIndex.getZExtValue()&& | |||
| 2542 | DIE->getInit()->HasSideEffects(SemaRef.Context) && !VerifyOnly) | |||
| 2543 | FullyStructuredList->sawArrayRangeDesignator(); | |||
| 2544 | } | |||
| 2545 | ||||
| 2546 | if (isa<ConstantArrayType>(AT)) { | |||
| 2547 | llvm::APSInt MaxElements(cast<ConstantArrayType>(AT)->getSize(), false); | |||
| 2548 | DesignatedStartIndex | |||
| 2549 | = DesignatedStartIndex.extOrTrunc(MaxElements.getBitWidth()); | |||
| 2550 | DesignatedStartIndex.setIsUnsigned(MaxElements.isUnsigned()); | |||
| 2551 | DesignatedEndIndex | |||
| 2552 | = DesignatedEndIndex.extOrTrunc(MaxElements.getBitWidth()); | |||
| 2553 | DesignatedEndIndex.setIsUnsigned(MaxElements.isUnsigned()); | |||
| 2554 | if (DesignatedEndIndex >= MaxElements) { | |||
| 2555 | if (!VerifyOnly) | |||
| 2556 | SemaRef.Diag(IndexExpr->getLocStart(), | |||
| 2557 | diag::err_array_designator_too_large) | |||
| 2558 | << DesignatedEndIndex.toString(10) << MaxElements.toString(10) | |||
| 2559 | << IndexExpr->getSourceRange(); | |||
| 2560 | ++Index; | |||
| 2561 | return true; | |||
| 2562 | } | |||
| 2563 | } else { | |||
| 2564 | unsigned DesignatedIndexBitWidth = | |||
| 2565 | ConstantArrayType::getMaxSizeBits(SemaRef.Context); | |||
| 2566 | DesignatedStartIndex = | |||
| 2567 | DesignatedStartIndex.extOrTrunc(DesignatedIndexBitWidth); | |||
| 2568 | DesignatedEndIndex = | |||
| 2569 | DesignatedEndIndex.extOrTrunc(DesignatedIndexBitWidth); | |||
| 2570 | DesignatedStartIndex.setIsUnsigned(true); | |||
| 2571 | DesignatedEndIndex.setIsUnsigned(true); | |||
| 2572 | } | |||
| 2573 | ||||
| 2574 | if (!VerifyOnly && StructuredList->isStringLiteralInit()) { | |||
| 2575 | // We're modifying a string literal init; we have to decompose the string | |||
| 2576 | // so we can modify the individual characters. | |||
| 2577 | ASTContext &Context = SemaRef.Context; | |||
| 2578 | Expr *SubExpr = StructuredList->getInit(0)->IgnoreParens(); | |||
| 2579 | ||||
| 2580 | // Compute the character type | |||
| 2581 | QualType CharTy = AT->getElementType(); | |||
| 2582 | ||||
| 2583 | // Compute the type of the integer literals. | |||
| 2584 | QualType PromotedCharTy = CharTy; | |||
| 2585 | if (CharTy->isPromotableIntegerType()) | |||
| 2586 | PromotedCharTy = Context.getPromotedIntegerType(CharTy); | |||
| 2587 | unsigned PromotedCharTyWidth = Context.getTypeSize(PromotedCharTy); | |||
| 2588 | ||||
| 2589 | if (StringLiteral *SL = dyn_cast<StringLiteral>(SubExpr)) { | |||
| 2590 | // Get the length of the string. | |||
| 2591 | uint64_t StrLen = SL->getLength(); | |||
| 2592 | if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen)) | |||
| 2593 | StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue(); | |||
| 2594 | StructuredList->resizeInits(Context, StrLen); | |||
| 2595 | ||||
| 2596 | // Build a literal for each character in the string, and put them into | |||
| 2597 | // the init list. | |||
| 2598 | for (unsigned i = 0, e = StrLen; i != e; ++i) { | |||
| 2599 | llvm::APInt CodeUnit(PromotedCharTyWidth, SL->getCodeUnit(i)); | |||
| 2600 | Expr *Init = new (Context) IntegerLiteral( | |||
| 2601 | Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc()); | |||
| 2602 | if (CharTy != PromotedCharTy) | |||
| 2603 | Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast, | |||
| 2604 | Init, nullptr, VK_RValue); | |||
| 2605 | StructuredList->updateInit(Context, i, Init); | |||
| 2606 | } | |||
| 2607 | } else { | |||
| 2608 | ObjCEncodeExpr *E = cast<ObjCEncodeExpr>(SubExpr); | |||
| 2609 | std::string Str; | |||
| 2610 | Context.getObjCEncodingForType(E->getEncodedType(), Str); | |||
| 2611 | ||||
| 2612 | // Get the length of the string. | |||
| 2613 | uint64_t StrLen = Str.size(); | |||
| 2614 | if (cast<ConstantArrayType>(AT)->getSize().ult(StrLen)) | |||
| 2615 | StrLen = cast<ConstantArrayType>(AT)->getSize().getZExtValue(); | |||
| 2616 | StructuredList->resizeInits(Context, StrLen); | |||
| 2617 | ||||
| 2618 | // Build a literal for each character in the string, and put them into | |||
| 2619 | // the init list. | |||
| 2620 | for (unsigned i = 0, e = StrLen; i != e; ++i) { | |||
| 2621 | llvm::APInt CodeUnit(PromotedCharTyWidth, Str[i]); | |||
| 2622 | Expr *Init = new (Context) IntegerLiteral( | |||
| 2623 | Context, CodeUnit, PromotedCharTy, SubExpr->getExprLoc()); | |||
| 2624 | if (CharTy != PromotedCharTy) | |||
| 2625 | Init = ImplicitCastExpr::Create(Context, CharTy, CK_IntegralCast, | |||
| 2626 | Init, nullptr, VK_RValue); | |||
| 2627 | StructuredList->updateInit(Context, i, Init); | |||
| 2628 | } | |||
| 2629 | } | |||
| 2630 | } | |||
| 2631 | ||||
| 2632 | // Make sure that our non-designated initializer list has space | |||
| 2633 | // for a subobject corresponding to this array element. | |||
| 2634 | if (!VerifyOnly && | |||
| 2635 | DesignatedEndIndex.getZExtValue() >= StructuredList->getNumInits()) | |||
| 2636 | StructuredList->resizeInits(SemaRef.Context, | |||
| 2637 | DesignatedEndIndex.getZExtValue() + 1); | |||
| 2638 | ||||
| 2639 | // Repeatedly perform subobject initializations in the range | |||
| 2640 | // [DesignatedStartIndex, DesignatedEndIndex]. | |||
| 2641 | ||||
| 2642 | // Move to the next designator | |||
| 2643 | unsigned ElementIndex = DesignatedStartIndex.getZExtValue(); | |||
| 2644 | unsigned OldIndex = Index; | |||
| 2645 | ||||
| 2646 | InitializedEntity ElementEntity = | |||
| 2647 | InitializedEntity::InitializeElement(SemaRef.Context, 0, Entity); | |||
| 2648 | ||||
| 2649 | while (DesignatedStartIndex <= DesignatedEndIndex) { | |||
| 2650 | // Recurse to check later designated subobjects. | |||
| 2651 | QualType ElementType = AT->getElementType(); | |||
| 2652 | Index = OldIndex; | |||
| 2653 | ||||
| 2654 | ElementEntity.setElementIndex(ElementIndex); | |||
| 2655 | if (CheckDesignatedInitializer( | |||
| 2656 | ElementEntity, IList, DIE, DesigIdx + 1, ElementType, nullptr, | |||
| 2657 | nullptr, Index, StructuredList, ElementIndex, | |||
| 2658 | FinishSubobjectInit && (DesignatedStartIndex == DesignatedEndIndex), | |||
| 2659 | false)) | |||
| 2660 | return true; | |||
| 2661 | ||||
| 2662 | // Move to the next index in the array that we'll be initializing. | |||
| 2663 | ++DesignatedStartIndex; | |||
| 2664 | ElementIndex = DesignatedStartIndex.getZExtValue(); | |||
| 2665 | } | |||
| 2666 | ||||
| 2667 | // If this the first designator, our caller will continue checking | |||
| 2668 | // the rest of this array subobject. | |||
| 2669 | if (IsFirstDesignator) { | |||
| 2670 | if (NextElementIndex) | |||
| 2671 | *NextElementIndex = DesignatedStartIndex; | |||
| 2672 | StructuredIndex = ElementIndex; | |||
| 2673 | return false; | |||
| 2674 | } | |||
| 2675 | ||||
| 2676 | if (!FinishSubobjectInit) | |||
| 2677 | return false; | |||
| 2678 | ||||
| 2679 | // Check the remaining elements within this array subobject. | |||
| 2680 | bool prevHadError = hadError; | |||
| 2681 | CheckArrayType(Entity, IList, CurrentObjectType, DesignatedStartIndex, | |||
| 2682 | /*SubobjectIsDesignatorContext=*/false, Index, | |||
| 2683 | StructuredList, ElementIndex); | |||
| 2684 | return hadError && !prevHadError; | |||
| 2685 | } | |||
| 2686 | ||||
| 2687 | // Get the structured initializer list for a subobject of type | |||
| 2688 | // @p CurrentObjectType. | |||
| 2689 | InitListExpr * | |||
| 2690 | InitListChecker::getStructuredSubobjectInit(InitListExpr *IList, unsigned Index, | |||
| 2691 | QualType CurrentObjectType, | |||
| 2692 | InitListExpr *StructuredList, | |||
| 2693 | unsigned StructuredIndex, | |||
| 2694 | SourceRange InitRange, | |||
| 2695 | bool IsFullyOverwritten) { | |||
| 2696 | if (VerifyOnly) | |||
| 2697 | return nullptr; // No structured list in verification-only mode. | |||
| 2698 | Expr *ExistingInit = nullptr; | |||
| 2699 | if (!StructuredList) | |||
| 2700 | ExistingInit = SyntacticToSemantic.lookup(IList); | |||
| 2701 | else if (StructuredIndex < StructuredList->getNumInits()) | |||
| 2702 | ExistingInit = StructuredList->getInit(StructuredIndex); | |||
| 2703 | ||||
| 2704 | if (InitListExpr *Result = dyn_cast_or_null<InitListExpr>(ExistingInit)) | |||
| 2705 | // There might have already been initializers for subobjects of the current | |||
| 2706 | // object, but a subsequent initializer list will overwrite the entirety | |||
| 2707 | // of the current object. (See DR 253 and C99 6.7.8p21). e.g., | |||
| 2708 | // | |||
| 2709 | // struct P { char x[6]; }; | |||
| 2710 | // struct P l = { .x[2] = 'x', .x = { [0] = 'f' } }; | |||
| 2711 | // | |||
| 2712 | // The first designated initializer is ignored, and l.x is just "f". | |||
| 2713 | if (!IsFullyOverwritten) | |||
| 2714 | return Result; | |||
| 2715 | ||||
| 2716 | if (ExistingInit) { | |||
| 2717 | // We are creating an initializer list that initializes the | |||
| 2718 | // subobjects of the current object, but there was already an | |||
| 2719 | // initialization that completely initialized the current | |||
| 2720 | // subobject, e.g., by a compound literal: | |||
| 2721 | // | |||
| 2722 | // struct X { int a, b; }; | |||
| 2723 | // struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 }; | |||
| 2724 | // | |||
| 2725 | // Here, xs[0].a == 0 and xs[0].b == 3, since the second, | |||
| 2726 | // designated initializer re-initializes the whole | |||
| 2727 | // subobject [0], overwriting previous initializers. | |||
| 2728 | SemaRef.Diag(InitRange.getBegin(), | |||
| 2729 | diag::warn_subobject_initializer_overrides) | |||
| 2730 | << InitRange; | |||
| 2731 | SemaRef.Diag(ExistingInit->getLocStart(), | |||
| 2732 | diag::note_previous_initializer) | |||
| 2733 | << /*FIXME:has side effects=*/0 | |||
| 2734 | << ExistingInit->getSourceRange(); | |||
| 2735 | } | |||
| 2736 | ||||
| 2737 | InitListExpr *Result | |||
| 2738 | = new (SemaRef.Context) InitListExpr(SemaRef.Context, | |||
| 2739 | InitRange.getBegin(), None, | |||
| 2740 | InitRange.getEnd()); | |||
| 2741 | ||||
| 2742 | QualType ResultType = CurrentObjectType; | |||
| 2743 | if (!ResultType->isArrayType()) | |||
| 2744 | ResultType = ResultType.getNonLValueExprType(SemaRef.Context); | |||
| 2745 | Result->setType(ResultType); | |||
| 2746 | ||||
| 2747 | // Pre-allocate storage for the structured initializer list. | |||
| 2748 | unsigned NumElements = 0; | |||
| 2749 | unsigned NumInits = 0; | |||
| 2750 | bool GotNumInits = false; | |||
| 2751 | if (!StructuredList) { | |||
| 2752 | NumInits = IList->getNumInits(); | |||
| 2753 | GotNumInits = true; | |||
| 2754 | } else if (Index < IList->getNumInits()) { | |||
| 2755 | if (InitListExpr *SubList = dyn_cast<InitListExpr>(IList->getInit(Index))) { | |||
| 2756 | NumInits = SubList->getNumInits(); | |||
| 2757 | GotNumInits = true; | |||
| 2758 | } | |||
| 2759 | } | |||
| 2760 | ||||
| 2761 | if (const ArrayType *AType | |||
| 2762 | = SemaRef.Context.getAsArrayType(CurrentObjectType)) { | |||
| 2763 | if (const ConstantArrayType *CAType = dyn_cast<ConstantArrayType>(AType)) { | |||
| 2764 | NumElements = CAType->getSize().getZExtValue(); | |||
| 2765 | // Simple heuristic so that we don't allocate a very large | |||
| 2766 | // initializer with many empty entries at the end. | |||
| 2767 | if (GotNumInits && NumElements > NumInits) | |||
| 2768 | NumElements = 0; | |||
| 2769 | } | |||
| 2770 | } else if (const VectorType *VType = CurrentObjectType->getAs<VectorType>()) | |||
| 2771 | NumElements = VType->getNumElements(); | |||
| 2772 | else if (const RecordType *RType = CurrentObjectType->getAs<RecordType>()) { | |||
| 2773 | RecordDecl *RDecl = RType->getDecl(); | |||
| 2774 | if (RDecl->isUnion()) | |||
| 2775 | NumElements = 1; | |||
| 2776 | else | |||
| 2777 | NumElements = std::distance(RDecl->field_begin(), RDecl->field_end()); | |||
| 2778 | } | |||
| 2779 | ||||
| 2780 | Result->reserveInits(SemaRef.Context, NumElements); | |||
| 2781 | ||||
| 2782 | // Link this new initializer list into the structured initializer | |||
| 2783 | // lists. | |||
| 2784 | if (StructuredList) | |||
| 2785 | StructuredList->updateInit(SemaRef.Context, StructuredIndex, Result); | |||
| 2786 | else { | |||
| 2787 | Result->setSyntacticForm(IList); | |||
| 2788 | SyntacticToSemantic[IList] = Result; | |||
| 2789 | } | |||
| 2790 | ||||
| 2791 | return Result; | |||
| 2792 | } | |||
| 2793 | ||||
| 2794 | /// Update the initializer at index @p StructuredIndex within the | |||
| 2795 | /// structured initializer list to the value @p expr. | |||
| 2796 | void InitListChecker::UpdateStructuredListElement(InitListExpr *StructuredList, | |||
| 2797 | unsigned &StructuredIndex, | |||
| 2798 | Expr *expr) { | |||
| 2799 | // No structured initializer list to update | |||
| 2800 | if (!StructuredList) | |||
| 2801 | return; | |||
| 2802 | ||||
| 2803 | if (Expr *PrevInit = StructuredList->updateInit(SemaRef.Context, | |||
| 2804 | StructuredIndex, expr)) { | |||
| 2805 | // This initializer overwrites a previous initializer. Warn. | |||
| 2806 | // We need to check on source range validity because the previous | |||
| 2807 | // initializer does not have to be an explicit initializer. | |||
| 2808 | // struct P { int a, b; }; | |||
| 2809 | // struct PP { struct P p } l = { { .a = 2 }, .p.b = 3 }; | |||
| 2810 | // There is an overwrite taking place because the first braced initializer | |||
| 2811 | // list "{ .a = 2 }' already provides value for .p.b (which is zero). | |||
| 2812 | if (PrevInit->getSourceRange().isValid()) { | |||
| 2813 | SemaRef.Diag(expr->getLocStart(), | |||
| 2814 | diag::warn_initializer_overrides) | |||
| 2815 | << expr->getSourceRange(); | |||
| 2816 | ||||
| 2817 | SemaRef.Diag(PrevInit->getLocStart(), | |||
| 2818 | diag::note_previous_initializer) | |||
| 2819 | << /*FIXME:has side effects=*/0 | |||
| 2820 | << PrevInit->getSourceRange(); | |||
| 2821 | } | |||
| 2822 | } | |||
| 2823 | ||||
| 2824 | ++StructuredIndex; | |||
| 2825 | } | |||
| 2826 | ||||
| 2827 | /// Check that the given Index expression is a valid array designator | |||
| 2828 | /// value. This is essentially just a wrapper around | |||
| 2829 | /// VerifyIntegerConstantExpression that also checks for negative values | |||
| 2830 | /// and produces a reasonable diagnostic if there is a | |||
| 2831 | /// failure. Returns the index expression, possibly with an implicit cast | |||
| 2832 | /// added, on success. If everything went okay, Value will receive the | |||
| 2833 | /// value of the constant expression. | |||
| 2834 | static ExprResult | |||
| 2835 | CheckArrayDesignatorExpr(Sema &S, Expr *Index, llvm::APSInt &Value) { | |||
| 2836 | SourceLocation Loc = Index->getLocStart(); | |||
| 2837 | ||||
| 2838 | // Make sure this is an integer constant expression. | |||
| 2839 | ExprResult Result = S.VerifyIntegerConstantExpression(Index, &Value); | |||
| 2840 | if (Result.isInvalid()) | |||
| 2841 | return Result; | |||
| 2842 | ||||
| 2843 | if (Value.isSigned() && Value.isNegative()) | |||
| 2844 | return S.Diag(Loc, diag::err_array_designator_negative) | |||
| 2845 | << Value.toString(10) << Index->getSourceRange(); | |||
| 2846 | ||||
| 2847 | Value.setIsUnsigned(true); | |||
| 2848 | return Result; | |||
| 2849 | } | |||
| 2850 | ||||
| 2851 | ExprResult Sema::ActOnDesignatedInitializer(Designation &Desig, | |||
| 2852 | SourceLocation Loc, | |||
| 2853 | bool GNUSyntax, | |||
| 2854 | ExprResult Init) { | |||
| 2855 | typedef DesignatedInitExpr::Designator ASTDesignator; | |||
| 2856 | ||||
| 2857 | bool Invalid = false; | |||
| 2858 | SmallVector<ASTDesignator, 32> Designators; | |||
| 2859 | SmallVector<Expr *, 32> InitExpressions; | |||
| 2860 | ||||
| 2861 | // Build designators and check array designator expressions. | |||
| 2862 | for (unsigned Idx = 0; Idx < Desig.getNumDesignators(); ++Idx) { | |||
| 2863 | const Designator &D = Desig.getDesignator(Idx); | |||
| 2864 | switch (D.getKind()) { | |||
| 2865 | case Designator::FieldDesignator: | |||
| 2866 | Designators.push_back(ASTDesignator(D.getField(), D.getDotLoc(), | |||
| 2867 | D.getFieldLoc())); | |||
| 2868 | break; | |||
| 2869 | ||||
| 2870 | case Designator::ArrayDesignator: { | |||
| 2871 | Expr *Index = static_cast<Expr *>(D.getArrayIndex()); | |||
| 2872 | llvm::APSInt IndexValue; | |||
| 2873 | if (!Index->isTypeDependent() && !Index->isValueDependent()) | |||
| 2874 | Index = CheckArrayDesignatorExpr(*this, Index, IndexValue).get(); | |||
| 2875 | if (!Index) | |||
| 2876 | Invalid = true; | |||
| 2877 | else { | |||
| 2878 | Designators.push_back(ASTDesignator(InitExpressions.size(), | |||
| 2879 | D.getLBracketLoc(), | |||
| 2880 | D.getRBracketLoc())); | |||
| 2881 | InitExpressions.push_back(Index); | |||
| 2882 | } | |||
| 2883 | break; | |||
| 2884 | } | |||
| 2885 | ||||
| 2886 | case Designator::ArrayRangeDesignator: { | |||
| 2887 | Expr *StartIndex = static_cast<Expr *>(D.getArrayRangeStart()); | |||
| 2888 | Expr *EndIndex = static_cast<Expr *>(D.getArrayRangeEnd()); | |||
| 2889 | llvm::APSInt StartValue; | |||
| 2890 | llvm::APSInt EndValue; | |||
| 2891 | bool StartDependent = StartIndex->isTypeDependent() || | |||
| 2892 | StartIndex->isValueDependent(); | |||
| 2893 | bool EndDependent = EndIndex->isTypeDependent() || | |||
| 2894 | EndIndex->isValueDependent(); | |||
| 2895 | if (!StartDependent) | |||
| 2896 | StartIndex = | |||
| 2897 | CheckArrayDesignatorExpr(*this, StartIndex, StartValue).get(); | |||
| 2898 | if (!EndDependent) | |||
| 2899 | EndIndex = CheckArrayDesignatorExpr(*this, EndIndex, EndValue).get(); | |||
| 2900 | ||||
| 2901 | if (!StartIndex || !EndIndex) | |||
| 2902 | Invalid = true; | |||
| 2903 | else { | |||
| 2904 | // Make sure we're comparing values with the same bit width. | |||
| 2905 | if (StartDependent || EndDependent) { | |||
| 2906 | // Nothing to compute. | |||
| 2907 | } else if (StartValue.getBitWidth() > EndValue.getBitWidth()) | |||
| 2908 | EndValue = EndValue.extend(StartValue.getBitWidth()); | |||
| 2909 | else if (StartValue.getBitWidth() < EndValue.getBitWidth()) | |||
| 2910 | StartValue = StartValue.extend(EndValue.getBitWidth()); | |||
| 2911 | ||||
| 2912 | if (!StartDependent && !EndDependent && EndValue < StartValue) { | |||
| 2913 | Diag(D.getEllipsisLoc(), diag::err_array_designator_empty_range) | |||
| 2914 | << StartValue.toString(10) << EndValue.toString(10) | |||
| 2915 | << StartIndex->getSourceRange() << EndIndex->getSourceRange(); | |||
| 2916 | Invalid = true; | |||
| 2917 | } else { | |||
| 2918 | Designators.push_back(ASTDesignator(InitExpressions.size(), | |||
| 2919 | D.getLBracketLoc(), | |||
| 2920 | D.getEllipsisLoc(), | |||
| 2921 | D.getRBracketLoc())); | |||
| 2922 | InitExpressions.push_back(StartIndex); | |||
| 2923 | InitExpressions.push_back(EndIndex); | |||
| 2924 | } | |||
| 2925 | } | |||
| 2926 | break; | |||
| 2927 | } | |||
| 2928 | } | |||
| 2929 | } | |||
| 2930 | ||||
| 2931 | if (Invalid || Init.isInvalid()) | |||
| 2932 | return ExprError(); | |||
| 2933 | ||||
| 2934 | // Clear out the expressions within the designation. | |||
| 2935 | Desig.ClearExprs(*this); | |||
| 2936 | ||||
| 2937 | DesignatedInitExpr *DIE | |||
| 2938 | = DesignatedInitExpr::Create(Context, | |||
| 2939 | Designators, | |||
| 2940 | InitExpressions, Loc, GNUSyntax, | |||
| 2941 | Init.getAs<Expr>()); | |||
| 2942 | ||||
| 2943 | if (!getLangOpts().C99) | |||
| 2944 | Diag(DIE->getLocStart(), diag::ext_designated_init) | |||
| 2945 | << DIE->getSourceRange(); | |||
| 2946 | ||||
| 2947 | return DIE; | |||
| 2948 | } | |||
| 2949 | ||||
| 2950 | //===----------------------------------------------------------------------===// | |||
| 2951 | // Initialization entity | |||
| 2952 | //===----------------------------------------------------------------------===// | |||
| 2953 | ||||
| 2954 | InitializedEntity::InitializedEntity(ASTContext &Context, unsigned Index, | |||
| 2955 | const InitializedEntity &Parent) | |||
| 2956 | : Parent(&Parent), Index(Index) | |||
| 2957 | { | |||
| 2958 | if (const ArrayType *AT = Context.getAsArrayType(Parent.getType())) { | |||
| 2959 | Kind = EK_ArrayElement; | |||
| 2960 | Type = AT->getElementType(); | |||
| 2961 | } else if (const VectorType *VT = Parent.getType()->getAs<VectorType>()) { | |||
| 2962 | Kind = EK_VectorElement; | |||
| 2963 | Type = VT->getElementType(); | |||
| 2964 | } else { | |||
| 2965 | const ComplexType *CT = Parent.getType()->getAs<ComplexType>(); | |||
| 2966 | assert(CT && "Unexpected type")(static_cast <bool> (CT && "Unexpected type") ? void (0) : __assert_fail ("CT && \"Unexpected type\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 2966, __extension__ __PRETTY_FUNCTION__)); | |||
| 2967 | Kind = EK_ComplexElement; | |||
| 2968 | Type = CT->getElementType(); | |||
| 2969 | } | |||
| 2970 | } | |||
| 2971 | ||||
| 2972 | InitializedEntity | |||
| 2973 | InitializedEntity::InitializeBase(ASTContext &Context, | |||
| 2974 | const CXXBaseSpecifier *Base, | |||
| 2975 | bool IsInheritedVirtualBase, | |||
| 2976 | const InitializedEntity *Parent) { | |||
| 2977 | InitializedEntity Result; | |||
| 2978 | Result.Kind = EK_Base; | |||
| 2979 | Result.Parent = Parent; | |||
| 2980 | Result.Base = reinterpret_cast<uintptr_t>(Base); | |||
| 2981 | if (IsInheritedVirtualBase) | |||
| 2982 | Result.Base |= 0x01; | |||
| 2983 | ||||
| 2984 | Result.Type = Base->getType(); | |||
| 2985 | return Result; | |||
| 2986 | } | |||
| 2987 | ||||
| 2988 | DeclarationName InitializedEntity::getName() const { | |||
| 2989 | switch (getKind()) { | |||
| 2990 | case EK_Parameter: | |||
| 2991 | case EK_Parameter_CF_Audited: { | |||
| 2992 | ParmVarDecl *D = reinterpret_cast<ParmVarDecl*>(Parameter & ~0x1); | |||
| 2993 | return (D ? D->getDeclName() : DeclarationName()); | |||
| 2994 | } | |||
| 2995 | ||||
| 2996 | case EK_Variable: | |||
| 2997 | case EK_Member: | |||
| 2998 | case EK_Binding: | |||
| 2999 | return Variable.VariableOrMember->getDeclName(); | |||
| 3000 | ||||
| 3001 | case EK_LambdaCapture: | |||
| 3002 | return DeclarationName(Capture.VarID); | |||
| 3003 | ||||
| 3004 | case EK_Result: | |||
| 3005 | case EK_StmtExprResult: | |||
| 3006 | case EK_Exception: | |||
| 3007 | case EK_New: | |||
| 3008 | case EK_Temporary: | |||
| 3009 | case EK_Base: | |||
| 3010 | case EK_Delegating: | |||
| 3011 | case EK_ArrayElement: | |||
| 3012 | case EK_VectorElement: | |||
| 3013 | case EK_ComplexElement: | |||
| 3014 | case EK_BlockElement: | |||
| 3015 | case EK_LambdaToBlockConversionBlockElement: | |||
| 3016 | case EK_CompoundLiteralInit: | |||
| 3017 | case EK_RelatedResult: | |||
| 3018 | return DeclarationName(); | |||
| 3019 | } | |||
| 3020 | ||||
| 3021 | llvm_unreachable("Invalid EntityKind!")::llvm::llvm_unreachable_internal("Invalid EntityKind!", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3021); | |||
| 3022 | } | |||
| 3023 | ||||
| 3024 | ValueDecl *InitializedEntity::getDecl() const { | |||
| 3025 | switch (getKind()) { | |||
| 3026 | case EK_Variable: | |||
| 3027 | case EK_Member: | |||
| 3028 | case EK_Binding: | |||
| 3029 | return Variable.VariableOrMember; | |||
| 3030 | ||||
| 3031 | case EK_Parameter: | |||
| 3032 | case EK_Parameter_CF_Audited: | |||
| 3033 | return reinterpret_cast<ParmVarDecl*>(Parameter & ~0x1); | |||
| 3034 | ||||
| 3035 | case EK_Result: | |||
| 3036 | case EK_StmtExprResult: | |||
| 3037 | case EK_Exception: | |||
| 3038 | case EK_New: | |||
| 3039 | case EK_Temporary: | |||
| 3040 | case EK_Base: | |||
| 3041 | case EK_Delegating: | |||
| 3042 | case EK_ArrayElement: | |||
| 3043 | case EK_VectorElement: | |||
| 3044 | case EK_ComplexElement: | |||
| 3045 | case EK_BlockElement: | |||
| 3046 | case EK_LambdaToBlockConversionBlockElement: | |||
| 3047 | case EK_LambdaCapture: | |||
| 3048 | case EK_CompoundLiteralInit: | |||
| 3049 | case EK_RelatedResult: | |||
| 3050 | return nullptr; | |||
| 3051 | } | |||
| 3052 | ||||
| 3053 | llvm_unreachable("Invalid EntityKind!")::llvm::llvm_unreachable_internal("Invalid EntityKind!", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3053); | |||
| 3054 | } | |||
| 3055 | ||||
| 3056 | bool InitializedEntity::allowsNRVO() const { | |||
| 3057 | switch (getKind()) { | |||
| 3058 | case EK_Result: | |||
| 3059 | case EK_Exception: | |||
| 3060 | return LocAndNRVO.NRVO; | |||
| 3061 | ||||
| 3062 | case EK_StmtExprResult: | |||
| 3063 | case EK_Variable: | |||
| 3064 | case EK_Parameter: | |||
| 3065 | case EK_Parameter_CF_Audited: | |||
| 3066 | case EK_Member: | |||
| 3067 | case EK_Binding: | |||
| 3068 | case EK_New: | |||
| 3069 | case EK_Temporary: | |||
| 3070 | case EK_CompoundLiteralInit: | |||
| 3071 | case EK_Base: | |||
| 3072 | case EK_Delegating: | |||
| 3073 | case EK_ArrayElement: | |||
| 3074 | case EK_VectorElement: | |||
| 3075 | case EK_ComplexElement: | |||
| 3076 | case EK_BlockElement: | |||
| 3077 | case EK_LambdaToBlockConversionBlockElement: | |||
| 3078 | case EK_LambdaCapture: | |||
| 3079 | case EK_RelatedResult: | |||
| 3080 | break; | |||
| 3081 | } | |||
| 3082 | ||||
| 3083 | return false; | |||
| 3084 | } | |||
| 3085 | ||||
| 3086 | unsigned InitializedEntity::dumpImpl(raw_ostream &OS) const { | |||
| 3087 | assert(getParent() != this)(static_cast <bool> (getParent() != this) ? void (0) : __assert_fail ("getParent() != this", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3087, __extension__ __PRETTY_FUNCTION__)); | |||
| 3088 | unsigned Depth = getParent() ? getParent()->dumpImpl(OS) : 0; | |||
| 3089 | for (unsigned I = 0; I != Depth; ++I) | |||
| 3090 | OS << "`-"; | |||
| 3091 | ||||
| 3092 | switch (getKind()) { | |||
| 3093 | case EK_Variable: OS << "Variable"; break; | |||
| 3094 | case EK_Parameter: OS << "Parameter"; break; | |||
| 3095 | case EK_Parameter_CF_Audited: OS << "CF audited function Parameter"; | |||
| 3096 | break; | |||
| 3097 | case EK_Result: OS << "Result"; break; | |||
| 3098 | case EK_StmtExprResult: OS << "StmtExprResult"; break; | |||
| 3099 | case EK_Exception: OS << "Exception"; break; | |||
| 3100 | case EK_Member: OS << "Member"; break; | |||
| 3101 | case EK_Binding: OS << "Binding"; break; | |||
| 3102 | case EK_New: OS << "New"; break; | |||
| 3103 | case EK_Temporary: OS << "Temporary"; break; | |||
| 3104 | case EK_CompoundLiteralInit: OS << "CompoundLiteral";break; | |||
| 3105 | case EK_RelatedResult: OS << "RelatedResult"; break; | |||
| 3106 | case EK_Base: OS << "Base"; break; | |||
| 3107 | case EK_Delegating: OS << "Delegating"; break; | |||
| 3108 | case EK_ArrayElement: OS << "ArrayElement " << Index; break; | |||
| 3109 | case EK_VectorElement: OS << "VectorElement " << Index; break; | |||
| 3110 | case EK_ComplexElement: OS << "ComplexElement " << Index; break; | |||
| 3111 | case EK_BlockElement: OS << "Block"; break; | |||
| 3112 | case EK_LambdaToBlockConversionBlockElement: | |||
| 3113 | OS << "Block (lambda)"; | |||
| 3114 | break; | |||
| 3115 | case EK_LambdaCapture: | |||
| 3116 | OS << "LambdaCapture "; | |||
| 3117 | OS << DeclarationName(Capture.VarID); | |||
| 3118 | break; | |||
| 3119 | } | |||
| 3120 | ||||
| 3121 | if (auto *D = getDecl()) { | |||
| 3122 | OS << " "; | |||
| 3123 | D->printQualifiedName(OS); | |||
| 3124 | } | |||
| 3125 | ||||
| 3126 | OS << " '" << getType().getAsString() << "'\n"; | |||
| 3127 | ||||
| 3128 | return Depth + 1; | |||
| 3129 | } | |||
| 3130 | ||||
| 3131 | LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void InitializedEntity::dump() const { | |||
| 3132 | dumpImpl(llvm::errs()); | |||
| 3133 | } | |||
| 3134 | ||||
| 3135 | //===----------------------------------------------------------------------===// | |||
| 3136 | // Initialization sequence | |||
| 3137 | //===----------------------------------------------------------------------===// | |||
| 3138 | ||||
| 3139 | void InitializationSequence::Step::Destroy() { | |||
| 3140 | switch (Kind) { | |||
| 3141 | case SK_ResolveAddressOfOverloadedFunction: | |||
| 3142 | case SK_CastDerivedToBaseRValue: | |||
| 3143 | case SK_CastDerivedToBaseXValue: | |||
| 3144 | case SK_CastDerivedToBaseLValue: | |||
| 3145 | case SK_BindReference: | |||
| 3146 | case SK_BindReferenceToTemporary: | |||
| 3147 | case SK_FinalCopy: | |||
| 3148 | case SK_ExtraneousCopyToTemporary: | |||
| 3149 | case SK_UserConversion: | |||
| 3150 | case SK_QualificationConversionRValue: | |||
| 3151 | case SK_QualificationConversionXValue: | |||
| 3152 | case SK_QualificationConversionLValue: | |||
| 3153 | case SK_AtomicConversion: | |||
| 3154 | case SK_LValueToRValue: | |||
| 3155 | case SK_ListInitialization: | |||
| 3156 | case SK_UnwrapInitList: | |||
| 3157 | case SK_RewrapInitList: | |||
| 3158 | case SK_ConstructorInitialization: | |||
| 3159 | case SK_ConstructorInitializationFromList: | |||
| 3160 | case SK_ZeroInitialization: | |||
| 3161 | case SK_CAssignment: | |||
| 3162 | case SK_StringInit: | |||
| 3163 | case SK_ObjCObjectConversion: | |||
| 3164 | case SK_ArrayLoopIndex: | |||
| 3165 | case SK_ArrayLoopInit: | |||
| 3166 | case SK_ArrayInit: | |||
| 3167 | case SK_GNUArrayInit: | |||
| 3168 | case SK_ParenthesizedArrayInit: | |||
| 3169 | case SK_PassByIndirectCopyRestore: | |||
| 3170 | case SK_PassByIndirectRestore: | |||
| 3171 | case SK_ProduceObjCObject: | |||
| 3172 | case SK_StdInitializerList: | |||
| 3173 | case SK_StdInitializerListConstructorCall: | |||
| 3174 | case SK_OCLSamplerInit: | |||
| 3175 | case SK_OCLZeroEvent: | |||
| 3176 | case SK_OCLZeroQueue: | |||
| 3177 | break; | |||
| 3178 | ||||
| 3179 | case SK_ConversionSequence: | |||
| 3180 | case SK_ConversionSequenceNoNarrowing: | |||
| 3181 | delete ICS; | |||
| 3182 | } | |||
| 3183 | } | |||
| 3184 | ||||
| 3185 | bool InitializationSequence::isDirectReferenceBinding() const { | |||
| 3186 | // There can be some lvalue adjustments after the SK_BindReference step. | |||
| 3187 | for (auto I = Steps.rbegin(); I != Steps.rend(); ++I) { | |||
| 3188 | if (I->Kind == SK_BindReference) | |||
| 3189 | return true; | |||
| 3190 | if (I->Kind == SK_BindReferenceToTemporary) | |||
| 3191 | return false; | |||
| 3192 | } | |||
| 3193 | return false; | |||
| 3194 | } | |||
| 3195 | ||||
| 3196 | bool InitializationSequence::isAmbiguous() const { | |||
| 3197 | if (!Failed()) | |||
| 3198 | return false; | |||
| 3199 | ||||
| 3200 | switch (getFailureKind()) { | |||
| 3201 | case FK_TooManyInitsForReference: | |||
| 3202 | case FK_ParenthesizedListInitForReference: | |||
| 3203 | case FK_ArrayNeedsInitList: | |||
| 3204 | case FK_ArrayNeedsInitListOrStringLiteral: | |||
| 3205 | case FK_ArrayNeedsInitListOrWideStringLiteral: | |||
| 3206 | case FK_NarrowStringIntoWideCharArray: | |||
| 3207 | case FK_WideStringIntoCharArray: | |||
| 3208 | case FK_IncompatWideStringIntoWideChar: | |||
| 3209 | case FK_PlainStringIntoUTF8Char: | |||
| 3210 | case FK_UTF8StringIntoPlainChar: | |||
| 3211 | case FK_AddressOfOverloadFailed: // FIXME: Could do better | |||
| 3212 | case FK_NonConstLValueReferenceBindingToTemporary: | |||
| 3213 | case FK_NonConstLValueReferenceBindingToBitfield: | |||
| 3214 | case FK_NonConstLValueReferenceBindingToVectorElement: | |||
| 3215 | case FK_NonConstLValueReferenceBindingToUnrelated: | |||
| 3216 | case FK_RValueReferenceBindingToLValue: | |||
| 3217 | case FK_ReferenceInitDropsQualifiers: | |||
| 3218 | case FK_ReferenceInitFailed: | |||
| 3219 | case FK_ConversionFailed: | |||
| 3220 | case FK_ConversionFromPropertyFailed: | |||
| 3221 | case FK_TooManyInitsForScalar: | |||
| 3222 | case FK_ParenthesizedListInitForScalar: | |||
| 3223 | case FK_ReferenceBindingToInitList: | |||
| 3224 | case FK_InitListBadDestinationType: | |||
| 3225 | case FK_DefaultInitOfConst: | |||
| 3226 | case FK_Incomplete: | |||
| 3227 | case FK_ArrayTypeMismatch: | |||
| 3228 | case FK_NonConstantArrayInit: | |||
| 3229 | case FK_ListInitializationFailed: | |||
| 3230 | case FK_VariableLengthArrayHasInitializer: | |||
| 3231 | case FK_PlaceholderType: | |||
| 3232 | case FK_ExplicitConstructor: | |||
| 3233 | case FK_AddressOfUnaddressableFunction: | |||
| 3234 | return false; | |||
| 3235 | ||||
| 3236 | case FK_ReferenceInitOverloadFailed: | |||
| 3237 | case FK_UserConversionOverloadFailed: | |||
| 3238 | case FK_ConstructorOverloadFailed: | |||
| 3239 | case FK_ListConstructorOverloadFailed: | |||
| 3240 | return FailedOverloadResult == OR_Ambiguous; | |||
| 3241 | } | |||
| 3242 | ||||
| 3243 | llvm_unreachable("Invalid EntityKind!")::llvm::llvm_unreachable_internal("Invalid EntityKind!", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3243); | |||
| 3244 | } | |||
| 3245 | ||||
| 3246 | bool InitializationSequence::isConstructorInitialization() const { | |||
| 3247 | return !Steps.empty() && Steps.back().Kind == SK_ConstructorInitialization; | |||
| 3248 | } | |||
| 3249 | ||||
| 3250 | void | |||
| 3251 | InitializationSequence | |||
| 3252 | ::AddAddressOverloadResolutionStep(FunctionDecl *Function, | |||
| 3253 | DeclAccessPair Found, | |||
| 3254 | bool HadMultipleCandidates) { | |||
| 3255 | Step S; | |||
| 3256 | S.Kind = SK_ResolveAddressOfOverloadedFunction; | |||
| 3257 | S.Type = Function->getType(); | |||
| 3258 | S.Function.HadMultipleCandidates = HadMultipleCandidates; | |||
| 3259 | S.Function.Function = Function; | |||
| 3260 | S.Function.FoundDecl = Found; | |||
| 3261 | Steps.push_back(S); | |||
| 3262 | } | |||
| 3263 | ||||
| 3264 | void InitializationSequence::AddDerivedToBaseCastStep(QualType BaseType, | |||
| 3265 | ExprValueKind VK) { | |||
| 3266 | Step S; | |||
| 3267 | switch (VK) { | |||
| 3268 | case VK_RValue: S.Kind = SK_CastDerivedToBaseRValue; break; | |||
| 3269 | case VK_XValue: S.Kind = SK_CastDerivedToBaseXValue; break; | |||
| 3270 | case VK_LValue: S.Kind = SK_CastDerivedToBaseLValue; break; | |||
| 3271 | } | |||
| 3272 | S.Type = BaseType; | |||
| 3273 | Steps.push_back(S); | |||
| 3274 | } | |||
| 3275 | ||||
| 3276 | void InitializationSequence::AddReferenceBindingStep(QualType T, | |||
| 3277 | bool BindingTemporary) { | |||
| 3278 | Step S; | |||
| 3279 | S.Kind = BindingTemporary? SK_BindReferenceToTemporary : SK_BindReference; | |||
| 3280 | S.Type = T; | |||
| 3281 | Steps.push_back(S); | |||
| 3282 | } | |||
| 3283 | ||||
| 3284 | void InitializationSequence::AddFinalCopy(QualType T) { | |||
| 3285 | Step S; | |||
| 3286 | S.Kind = SK_FinalCopy; | |||
| 3287 | S.Type = T; | |||
| 3288 | Steps.push_back(S); | |||
| 3289 | } | |||
| 3290 | ||||
| 3291 | void InitializationSequence::AddExtraneousCopyToTemporary(QualType T) { | |||
| 3292 | Step S; | |||
| 3293 | S.Kind = SK_ExtraneousCopyToTemporary; | |||
| 3294 | S.Type = T; | |||
| 3295 | Steps.push_back(S); | |||
| 3296 | } | |||
| 3297 | ||||
| 3298 | void | |||
| 3299 | InitializationSequence::AddUserConversionStep(FunctionDecl *Function, | |||
| 3300 | DeclAccessPair FoundDecl, | |||
| 3301 | QualType T, | |||
| 3302 | bool HadMultipleCandidates) { | |||
| 3303 | Step S; | |||
| 3304 | S.Kind = SK_UserConversion; | |||
| 3305 | S.Type = T; | |||
| 3306 | S.Function.HadMultipleCandidates = HadMultipleCandidates; | |||
| 3307 | S.Function.Function = Function; | |||
| 3308 | S.Function.FoundDecl = FoundDecl; | |||
| 3309 | Steps.push_back(S); | |||
| 3310 | } | |||
| 3311 | ||||
| 3312 | void InitializationSequence::AddQualificationConversionStep(QualType Ty, | |||
| 3313 | ExprValueKind VK) { | |||
| 3314 | Step S; | |||
| 3315 | S.Kind = SK_QualificationConversionRValue; // work around a gcc warning | |||
| 3316 | switch (VK) { | |||
| 3317 | case VK_RValue: | |||
| 3318 | S.Kind = SK_QualificationConversionRValue; | |||
| 3319 | break; | |||
| 3320 | case VK_XValue: | |||
| 3321 | S.Kind = SK_QualificationConversionXValue; | |||
| 3322 | break; | |||
| 3323 | case VK_LValue: | |||
| 3324 | S.Kind = SK_QualificationConversionLValue; | |||
| 3325 | break; | |||
| 3326 | } | |||
| 3327 | S.Type = Ty; | |||
| 3328 | Steps.push_back(S); | |||
| 3329 | } | |||
| 3330 | ||||
| 3331 | void InitializationSequence::AddAtomicConversionStep(QualType Ty) { | |||
| 3332 | Step S; | |||
| 3333 | S.Kind = SK_AtomicConversion; | |||
| 3334 | S.Type = Ty; | |||
| 3335 | Steps.push_back(S); | |||
| 3336 | } | |||
| 3337 | ||||
| 3338 | void InitializationSequence::AddLValueToRValueStep(QualType Ty) { | |||
| 3339 | assert(!Ty.hasQualifiers() && "rvalues may not have qualifiers")(static_cast <bool> (!Ty.hasQualifiers() && "rvalues may not have qualifiers" ) ? void (0) : __assert_fail ("!Ty.hasQualifiers() && \"rvalues may not have qualifiers\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3339, __extension__ __PRETTY_FUNCTION__)); | |||
| 3340 | ||||
| 3341 | Step S; | |||
| 3342 | S.Kind = SK_LValueToRValue; | |||
| 3343 | S.Type = Ty; | |||
| 3344 | Steps.push_back(S); | |||
| 3345 | } | |||
| 3346 | ||||
| 3347 | void InitializationSequence::AddConversionSequenceStep( | |||
| 3348 | const ImplicitConversionSequence &ICS, QualType T, | |||
| 3349 | bool TopLevelOfInitList) { | |||
| 3350 | Step S; | |||
| 3351 | S.Kind = TopLevelOfInitList ? SK_ConversionSequenceNoNarrowing | |||
| 3352 | : SK_ConversionSequence; | |||
| 3353 | S.Type = T; | |||
| 3354 | S.ICS = new ImplicitConversionSequence(ICS); | |||
| 3355 | Steps.push_back(S); | |||
| 3356 | } | |||
| 3357 | ||||
| 3358 | void InitializationSequence::AddListInitializationStep(QualType T) { | |||
| 3359 | Step S; | |||
| 3360 | S.Kind = SK_ListInitialization; | |||
| 3361 | S.Type = T; | |||
| 3362 | Steps.push_back(S); | |||
| 3363 | } | |||
| 3364 | ||||
| 3365 | void InitializationSequence::AddConstructorInitializationStep( | |||
| 3366 | DeclAccessPair FoundDecl, CXXConstructorDecl *Constructor, QualType T, | |||
| 3367 | bool HadMultipleCandidates, bool FromInitList, bool AsInitList) { | |||
| 3368 | Step S; | |||
| 3369 | S.Kind = FromInitList ? AsInitList ? SK_StdInitializerListConstructorCall | |||
| 3370 | : SK_ConstructorInitializationFromList | |||
| 3371 | : SK_ConstructorInitialization; | |||
| 3372 | S.Type = T; | |||
| 3373 | S.Function.HadMultipleCandidates = HadMultipleCandidates; | |||
| 3374 | S.Function.Function = Constructor; | |||
| 3375 | S.Function.FoundDecl = FoundDecl; | |||
| 3376 | Steps.push_back(S); | |||
| 3377 | } | |||
| 3378 | ||||
| 3379 | void InitializationSequence::AddZeroInitializationStep(QualType T) { | |||
| 3380 | Step S; | |||
| 3381 | S.Kind = SK_ZeroInitialization; | |||
| 3382 | S.Type = T; | |||
| 3383 | Steps.push_back(S); | |||
| 3384 | } | |||
| 3385 | ||||
| 3386 | void InitializationSequence::AddCAssignmentStep(QualType T) { | |||
| 3387 | Step S; | |||
| 3388 | S.Kind = SK_CAssignment; | |||
| 3389 | S.Type = T; | |||
| 3390 | Steps.push_back(S); | |||
| 3391 | } | |||
| 3392 | ||||
| 3393 | void InitializationSequence::AddStringInitStep(QualType T) { | |||
| 3394 | Step S; | |||
| 3395 | S.Kind = SK_StringInit; | |||
| 3396 | S.Type = T; | |||
| 3397 | Steps.push_back(S); | |||
| 3398 | } | |||
| 3399 | ||||
| 3400 | void InitializationSequence::AddObjCObjectConversionStep(QualType T) { | |||
| 3401 | Step S; | |||
| 3402 | S.Kind = SK_ObjCObjectConversion; | |||
| 3403 | S.Type = T; | |||
| 3404 | Steps.push_back(S); | |||
| 3405 | } | |||
| 3406 | ||||
| 3407 | void InitializationSequence::AddArrayInitStep(QualType T, bool IsGNUExtension) { | |||
| 3408 | Step S; | |||
| 3409 | S.Kind = IsGNUExtension ? SK_GNUArrayInit : SK_ArrayInit; | |||
| 3410 | S.Type = T; | |||
| 3411 | Steps.push_back(S); | |||
| 3412 | } | |||
| 3413 | ||||
| 3414 | void InitializationSequence::AddArrayInitLoopStep(QualType T, QualType EltT) { | |||
| 3415 | Step S; | |||
| 3416 | S.Kind = SK_ArrayLoopIndex; | |||
| 3417 | S.Type = EltT; | |||
| 3418 | Steps.insert(Steps.begin(), S); | |||
| 3419 | ||||
| 3420 | S.Kind = SK_ArrayLoopInit; | |||
| 3421 | S.Type = T; | |||
| 3422 | Steps.push_back(S); | |||
| 3423 | } | |||
| 3424 | ||||
| 3425 | void InitializationSequence::AddParenthesizedArrayInitStep(QualType T) { | |||
| 3426 | Step S; | |||
| 3427 | S.Kind = SK_ParenthesizedArrayInit; | |||
| 3428 | S.Type = T; | |||
| 3429 | Steps.push_back(S); | |||
| 3430 | } | |||
| 3431 | ||||
| 3432 | void InitializationSequence::AddPassByIndirectCopyRestoreStep(QualType type, | |||
| 3433 | bool shouldCopy) { | |||
| 3434 | Step s; | |||
| 3435 | s.Kind = (shouldCopy ? SK_PassByIndirectCopyRestore | |||
| 3436 | : SK_PassByIndirectRestore); | |||
| 3437 | s.Type = type; | |||
| 3438 | Steps.push_back(s); | |||
| 3439 | } | |||
| 3440 | ||||
| 3441 | void InitializationSequence::AddProduceObjCObjectStep(QualType T) { | |||
| 3442 | Step S; | |||
| 3443 | S.Kind = SK_ProduceObjCObject; | |||
| 3444 | S.Type = T; | |||
| 3445 | Steps.push_back(S); | |||
| 3446 | } | |||
| 3447 | ||||
| 3448 | void InitializationSequence::AddStdInitializerListConstructionStep(QualType T) { | |||
| 3449 | Step S; | |||
| 3450 | S.Kind = SK_StdInitializerList; | |||
| 3451 | S.Type = T; | |||
| 3452 | Steps.push_back(S); | |||
| 3453 | } | |||
| 3454 | ||||
| 3455 | void InitializationSequence::AddOCLSamplerInitStep(QualType T) { | |||
| 3456 | Step S; | |||
| 3457 | S.Kind = SK_OCLSamplerInit; | |||
| 3458 | S.Type = T; | |||
| 3459 | Steps.push_back(S); | |||
| 3460 | } | |||
| 3461 | ||||
| 3462 | void InitializationSequence::AddOCLZeroEventStep(QualType T) { | |||
| 3463 | Step S; | |||
| 3464 | S.Kind = SK_OCLZeroEvent; | |||
| 3465 | S.Type = T; | |||
| 3466 | Steps.push_back(S); | |||
| 3467 | } | |||
| 3468 | ||||
| 3469 | void InitializationSequence::AddOCLZeroQueueStep(QualType T) { | |||
| 3470 | Step S; | |||
| 3471 | S.Kind = SK_OCLZeroQueue; | |||
| 3472 | S.Type = T; | |||
| 3473 | Steps.push_back(S); | |||
| 3474 | } | |||
| 3475 | ||||
| 3476 | void InitializationSequence::RewrapReferenceInitList(QualType T, | |||
| 3477 | InitListExpr *Syntactic) { | |||
| 3478 | assert(Syntactic->getNumInits() == 1 &&(static_cast <bool> (Syntactic->getNumInits() == 1 && "Can only rewrap trivial init lists.") ? void (0) : __assert_fail ("Syntactic->getNumInits() == 1 && \"Can only rewrap trivial init lists.\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3479, __extension__ __PRETTY_FUNCTION__)) | |||
| 3479 | "Can only rewrap trivial init lists.")(static_cast <bool> (Syntactic->getNumInits() == 1 && "Can only rewrap trivial init lists.") ? void (0) : __assert_fail ("Syntactic->getNumInits() == 1 && \"Can only rewrap trivial init lists.\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3479, __extension__ __PRETTY_FUNCTION__)); | |||
| 3480 | Step S; | |||
| 3481 | S.Kind = SK_UnwrapInitList; | |||
| 3482 | S.Type = Syntactic->getInit(0)->getType(); | |||
| 3483 | Steps.insert(Steps.begin(), S); | |||
| 3484 | ||||
| 3485 | S.Kind = SK_RewrapInitList; | |||
| 3486 | S.Type = T; | |||
| 3487 | S.WrappingSyntacticList = Syntactic; | |||
| 3488 | Steps.push_back(S); | |||
| 3489 | } | |||
| 3490 | ||||
| 3491 | void InitializationSequence::SetOverloadFailure(FailureKind Failure, | |||
| 3492 | OverloadingResult Result) { | |||
| 3493 | setSequenceKind(FailedSequence); | |||
| 3494 | this->Failure = Failure; | |||
| 3495 | this->FailedOverloadResult = Result; | |||
| 3496 | } | |||
| 3497 | ||||
| 3498 | //===----------------------------------------------------------------------===// | |||
| 3499 | // Attempt initialization | |||
| 3500 | //===----------------------------------------------------------------------===// | |||
| 3501 | ||||
| 3502 | /// Tries to add a zero initializer. Returns true if that worked. | |||
| 3503 | static bool | |||
| 3504 | maybeRecoverWithZeroInitialization(Sema &S, InitializationSequence &Sequence, | |||
| 3505 | const InitializedEntity &Entity) { | |||
| 3506 | if (Entity.getKind() != InitializedEntity::EK_Variable) | |||
| 3507 | return false; | |||
| 3508 | ||||
| 3509 | VarDecl *VD = cast<VarDecl>(Entity.getDecl()); | |||
| 3510 | if (VD->getInit() || VD->getLocEnd().isMacroID()) | |||
| 3511 | return false; | |||
| 3512 | ||||
| 3513 | QualType VariableTy = VD->getType().getCanonicalType(); | |||
| 3514 | SourceLocation Loc = S.getLocForEndOfToken(VD->getLocEnd()); | |||
| 3515 | std::string Init = S.getFixItZeroInitializerForType(VariableTy, Loc); | |||
| 3516 | if (!Init.empty()) { | |||
| 3517 | Sequence.AddZeroInitializationStep(Entity.getType()); | |||
| 3518 | Sequence.SetZeroInitializationFixit(Init, Loc); | |||
| 3519 | return true; | |||
| 3520 | } | |||
| 3521 | return false; | |||
| 3522 | } | |||
| 3523 | ||||
| 3524 | static void MaybeProduceObjCObject(Sema &S, | |||
| 3525 | InitializationSequence &Sequence, | |||
| 3526 | const InitializedEntity &Entity) { | |||
| 3527 | if (!S.getLangOpts().ObjCAutoRefCount) return; | |||
| 3528 | ||||
| 3529 | /// When initializing a parameter, produce the value if it's marked | |||
| 3530 | /// __attribute__((ns_consumed)). | |||
| 3531 | if (Entity.isParameterKind()) { | |||
| 3532 | if (!Entity.isParameterConsumed()) | |||
| 3533 | return; | |||
| 3534 | ||||
| 3535 | assert(Entity.getType()->isObjCRetainableType() &&(static_cast <bool> (Entity.getType()->isObjCRetainableType () && "consuming an object of unretainable type?") ? void (0) : __assert_fail ("Entity.getType()->isObjCRetainableType() && \"consuming an object of unretainable type?\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3536, __extension__ __PRETTY_FUNCTION__)) | |||
| 3536 | "consuming an object of unretainable type?")(static_cast <bool> (Entity.getType()->isObjCRetainableType () && "consuming an object of unretainable type?") ? void (0) : __assert_fail ("Entity.getType()->isObjCRetainableType() && \"consuming an object of unretainable type?\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3536, __extension__ __PRETTY_FUNCTION__)); | |||
| 3537 | Sequence.AddProduceObjCObjectStep(Entity.getType()); | |||
| 3538 | ||||
| 3539 | /// When initializing a return value, if the return type is a | |||
| 3540 | /// retainable type, then returns need to immediately retain the | |||
| 3541 | /// object. If an autorelease is required, it will be done at the | |||
| 3542 | /// last instant. | |||
| 3543 | } else if (Entity.getKind() == InitializedEntity::EK_Result || | |||
| 3544 | Entity.getKind() == InitializedEntity::EK_StmtExprResult) { | |||
| 3545 | if (!Entity.getType()->isObjCRetainableType()) | |||
| 3546 | return; | |||
| 3547 | ||||
| 3548 | Sequence.AddProduceObjCObjectStep(Entity.getType()); | |||
| 3549 | } | |||
| 3550 | } | |||
| 3551 | ||||
| 3552 | static void TryListInitialization(Sema &S, | |||
| 3553 | const InitializedEntity &Entity, | |||
| 3554 | const InitializationKind &Kind, | |||
| 3555 | InitListExpr *InitList, | |||
| 3556 | InitializationSequence &Sequence, | |||
| 3557 | bool TreatUnavailableAsInvalid); | |||
| 3558 | ||||
| 3559 | /// When initializing from init list via constructor, handle | |||
| 3560 | /// initialization of an object of type std::initializer_list<T>. | |||
| 3561 | /// | |||
| 3562 | /// \return true if we have handled initialization of an object of type | |||
| 3563 | /// std::initializer_list<T>, false otherwise. | |||
| 3564 | static bool TryInitializerListConstruction(Sema &S, | |||
| 3565 | InitListExpr *List, | |||
| 3566 | QualType DestType, | |||
| 3567 | InitializationSequence &Sequence, | |||
| 3568 | bool TreatUnavailableAsInvalid) { | |||
| 3569 | QualType E; | |||
| 3570 | if (!S.isStdInitializerList(DestType, &E)) | |||
| 3571 | return false; | |||
| 3572 | ||||
| 3573 | if (!S.isCompleteType(List->getExprLoc(), E)) { | |||
| 3574 | Sequence.setIncompleteTypeFailure(E); | |||
| 3575 | return true; | |||
| 3576 | } | |||
| 3577 | ||||
| 3578 | // Try initializing a temporary array from the init list. | |||
| 3579 | QualType ArrayType = S.Context.getConstantArrayType( | |||
| 3580 | E.withConst(), llvm::APInt(S.Context.getTypeSize(S.Context.getSizeType()), | |||
| 3581 | List->getNumInits()), | |||
| 3582 | clang::ArrayType::Normal, 0); | |||
| 3583 | InitializedEntity HiddenArray = | |||
| 3584 | InitializedEntity::InitializeTemporary(ArrayType); | |||
| 3585 | InitializationKind Kind = InitializationKind::CreateDirectList( | |||
| 3586 | List->getExprLoc(), List->getLocStart(), List->getLocEnd()); | |||
| 3587 | TryListInitialization(S, HiddenArray, Kind, List, Sequence, | |||
| 3588 | TreatUnavailableAsInvalid); | |||
| 3589 | if (Sequence) | |||
| 3590 | Sequence.AddStdInitializerListConstructionStep(DestType); | |||
| 3591 | return true; | |||
| 3592 | } | |||
| 3593 | ||||
| 3594 | /// Determine if the constructor has the signature of a copy or move | |||
| 3595 | /// constructor for the type T of the class in which it was found. That is, | |||
| 3596 | /// determine if its first parameter is of type T or reference to (possibly | |||
| 3597 | /// cv-qualified) T. | |||
| 3598 | static bool hasCopyOrMoveCtorParam(ASTContext &Ctx, | |||
| 3599 | const ConstructorInfo &Info) { | |||
| 3600 | if (Info.Constructor->getNumParams() == 0) | |||
| 3601 | return false; | |||
| 3602 | ||||
| 3603 | QualType ParmT = | |||
| 3604 | Info.Constructor->getParamDecl(0)->getType().getNonReferenceType(); | |||
| 3605 | QualType ClassT = | |||
| 3606 | Ctx.getRecordType(cast<CXXRecordDecl>(Info.FoundDecl->getDeclContext())); | |||
| 3607 | ||||
| 3608 | return Ctx.hasSameUnqualifiedType(ParmT, ClassT); | |||
| 3609 | } | |||
| 3610 | ||||
| 3611 | static OverloadingResult | |||
| 3612 | ResolveConstructorOverload(Sema &S, SourceLocation DeclLoc, | |||
| 3613 | MultiExprArg Args, | |||
| 3614 | OverloadCandidateSet &CandidateSet, | |||
| 3615 | QualType DestType, | |||
| 3616 | DeclContext::lookup_result Ctors, | |||
| 3617 | OverloadCandidateSet::iterator &Best, | |||
| 3618 | bool CopyInitializing, bool AllowExplicit, | |||
| 3619 | bool OnlyListConstructors, bool IsListInit, | |||
| 3620 | bool SecondStepOfCopyInit = false) { | |||
| 3621 | CandidateSet.clear(OverloadCandidateSet::CSK_InitByConstructor); | |||
| 3622 | ||||
| 3623 | for (NamedDecl *D : Ctors) { | |||
| 3624 | auto Info = getConstructorInfo(D); | |||
| 3625 | if (!Info.Constructor || Info.Constructor->isInvalidDecl()) | |||
| 3626 | continue; | |||
| 3627 | ||||
| 3628 | if (!AllowExplicit && Info.Constructor->isExplicit()) | |||
| 3629 | continue; | |||
| 3630 | ||||
| 3631 | if (OnlyListConstructors && !S.isInitListConstructor(Info.Constructor)) | |||
| 3632 | continue; | |||
| 3633 | ||||
| 3634 | // C++11 [over.best.ics]p4: | |||
| 3635 | // ... and the constructor or user-defined conversion function is a | |||
| 3636 | // candidate by | |||
| 3637 | // - 13.3.1.3, when the argument is the temporary in the second step | |||
| 3638 | // of a class copy-initialization, or | |||
| 3639 | // - 13.3.1.4, 13.3.1.5, or 13.3.1.6 (in all cases), [not handled here] | |||
| 3640 | // - the second phase of 13.3.1.7 when the initializer list has exactly | |||
| 3641 | // one element that is itself an initializer list, and the target is | |||
| 3642 | // the first parameter of a constructor of class X, and the conversion | |||
| 3643 | // is to X or reference to (possibly cv-qualified X), | |||
| 3644 | // user-defined conversion sequences are not considered. | |||
| 3645 | bool SuppressUserConversions = | |||
| 3646 | SecondStepOfCopyInit || | |||
| 3647 | (IsListInit && Args.size() == 1 && isa<InitListExpr>(Args[0]) && | |||
| 3648 | hasCopyOrMoveCtorParam(S.Context, Info)); | |||
| 3649 | ||||
| 3650 | if (Info.ConstructorTmpl) | |||
| 3651 | S.AddTemplateOverloadCandidate(Info.ConstructorTmpl, Info.FoundDecl, | |||
| 3652 | /*ExplicitArgs*/ nullptr, Args, | |||
| 3653 | CandidateSet, SuppressUserConversions); | |||
| 3654 | else { | |||
| 3655 | // C++ [over.match.copy]p1: | |||
| 3656 | // - When initializing a temporary to be bound to the first parameter | |||
| 3657 | // of a constructor [for type T] that takes a reference to possibly | |||
| 3658 | // cv-qualified T as its first argument, called with a single | |||
| 3659 | // argument in the context of direct-initialization, explicit | |||
| 3660 | // conversion functions are also considered. | |||
| 3661 | // FIXME: What if a constructor template instantiates to such a signature? | |||
| 3662 | bool AllowExplicitConv = AllowExplicit && !CopyInitializing && | |||
| 3663 | Args.size() == 1 && | |||
| 3664 | hasCopyOrMoveCtorParam(S.Context, Info); | |||
| 3665 | S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl, Args, | |||
| 3666 | CandidateSet, SuppressUserConversions, | |||
| 3667 | /*PartialOverloading=*/false, | |||
| 3668 | /*AllowExplicit=*/AllowExplicitConv); | |||
| 3669 | } | |||
| 3670 | } | |||
| 3671 | ||||
| 3672 | // FIXME: Work around a bug in C++17 guaranteed copy elision. | |||
| 3673 | // | |||
| 3674 | // When initializing an object of class type T by constructor | |||
| 3675 | // ([over.match.ctor]) or by list-initialization ([over.match.list]) | |||
| 3676 | // from a single expression of class type U, conversion functions of | |||
| 3677 | // U that convert to the non-reference type cv T are candidates. | |||
| 3678 | // Explicit conversion functions are only candidates during | |||
| 3679 | // direct-initialization. | |||
| 3680 | // | |||
| 3681 | // Note: SecondStepOfCopyInit is only ever true in this case when | |||
| 3682 | // evaluating whether to produce a C++98 compatibility warning. | |||
| 3683 | if (S.getLangOpts().CPlusPlus17 && Args.size() == 1 && | |||
| 3684 | !SecondStepOfCopyInit) { | |||
| 3685 | Expr *Initializer = Args[0]; | |||
| 3686 | auto *SourceRD = Initializer->getType()->getAsCXXRecordDecl(); | |||
| 3687 | if (SourceRD && S.isCompleteType(DeclLoc, Initializer->getType())) { | |||
| 3688 | const auto &Conversions = SourceRD->getVisibleConversionFunctions(); | |||
| 3689 | for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) { | |||
| 3690 | NamedDecl *D = *I; | |||
| 3691 | CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); | |||
| 3692 | D = D->getUnderlyingDecl(); | |||
| 3693 | ||||
| 3694 | FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D); | |||
| 3695 | CXXConversionDecl *Conv; | |||
| 3696 | if (ConvTemplate) | |||
| 3697 | Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); | |||
| 3698 | else | |||
| 3699 | Conv = cast<CXXConversionDecl>(D); | |||
| 3700 | ||||
| 3701 | if ((AllowExplicit && !CopyInitializing) || !Conv->isExplicit()) { | |||
| 3702 | if (ConvTemplate) | |||
| 3703 | S.AddTemplateConversionCandidate(ConvTemplate, I.getPair(), | |||
| 3704 | ActingDC, Initializer, DestType, | |||
| 3705 | CandidateSet, AllowExplicit, | |||
| 3706 | /*AllowResultConversion*/false); | |||
| 3707 | else | |||
| 3708 | S.AddConversionCandidate(Conv, I.getPair(), ActingDC, Initializer, | |||
| 3709 | DestType, CandidateSet, AllowExplicit, | |||
| 3710 | /*AllowResultConversion*/false); | |||
| 3711 | } | |||
| 3712 | } | |||
| 3713 | } | |||
| 3714 | } | |||
| 3715 | ||||
| 3716 | // Perform overload resolution and return the result. | |||
| 3717 | return CandidateSet.BestViableFunction(S, DeclLoc, Best); | |||
| 3718 | } | |||
| 3719 | ||||
| 3720 | /// Attempt initialization by constructor (C++ [dcl.init]), which | |||
| 3721 | /// enumerates the constructors of the initialized entity and performs overload | |||
| 3722 | /// resolution to select the best. | |||
| 3723 | /// \param DestType The destination class type. | |||
| 3724 | /// \param DestArrayType The destination type, which is either DestType or | |||
| 3725 | /// a (possibly multidimensional) array of DestType. | |||
| 3726 | /// \param IsListInit Is this list-initialization? | |||
| 3727 | /// \param IsInitListCopy Is this non-list-initialization resulting from a | |||
| 3728 | /// list-initialization from {x} where x is the same | |||
| 3729 | /// type as the entity? | |||
| 3730 | static void TryConstructorInitialization(Sema &S, | |||
| 3731 | const InitializedEntity &Entity, | |||
| 3732 | const InitializationKind &Kind, | |||
| 3733 | MultiExprArg Args, QualType DestType, | |||
| 3734 | QualType DestArrayType, | |||
| 3735 | InitializationSequence &Sequence, | |||
| 3736 | bool IsListInit = false, | |||
| 3737 | bool IsInitListCopy = false) { | |||
| 3738 | assert(((!IsListInit && !IsInitListCopy) ||(static_cast <bool> (((!IsListInit && !IsInitListCopy ) || (Args.size() == 1 && isa<InitListExpr>(Args [0]))) && "IsListInit/IsInitListCopy must come with a single initializer list " "argument.") ? void (0) : __assert_fail ("((!IsListInit && !IsInitListCopy) || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) && \"IsListInit/IsInitListCopy must come with a single initializer list \" \"argument.\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3741, __extension__ __PRETTY_FUNCTION__)) | |||
| 3739 | (Args.size() == 1 && isa<InitListExpr>(Args[0]))) &&(static_cast <bool> (((!IsListInit && !IsInitListCopy ) || (Args.size() == 1 && isa<InitListExpr>(Args [0]))) && "IsListInit/IsInitListCopy must come with a single initializer list " "argument.") ? void (0) : __assert_fail ("((!IsListInit && !IsInitListCopy) || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) && \"IsListInit/IsInitListCopy must come with a single initializer list \" \"argument.\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3741, __extension__ __PRETTY_FUNCTION__)) | |||
| 3740 | "IsListInit/IsInitListCopy must come with a single initializer list "(static_cast <bool> (((!IsListInit && !IsInitListCopy ) || (Args.size() == 1 && isa<InitListExpr>(Args [0]))) && "IsListInit/IsInitListCopy must come with a single initializer list " "argument.") ? void (0) : __assert_fail ("((!IsListInit && !IsInitListCopy) || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) && \"IsListInit/IsInitListCopy must come with a single initializer list \" \"argument.\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3741, __extension__ __PRETTY_FUNCTION__)) | |||
| 3741 | "argument.")(static_cast <bool> (((!IsListInit && !IsInitListCopy ) || (Args.size() == 1 && isa<InitListExpr>(Args [0]))) && "IsListInit/IsInitListCopy must come with a single initializer list " "argument.") ? void (0) : __assert_fail ("((!IsListInit && !IsInitListCopy) || (Args.size() == 1 && isa<InitListExpr>(Args[0]))) && \"IsListInit/IsInitListCopy must come with a single initializer list \" \"argument.\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3741, __extension__ __PRETTY_FUNCTION__)); | |||
| 3742 | InitListExpr *ILE = | |||
| 3743 | (IsListInit || IsInitListCopy) ? cast<InitListExpr>(Args[0]) : nullptr; | |||
| 3744 | MultiExprArg UnwrappedArgs = | |||
| 3745 | ILE ? MultiExprArg(ILE->getInits(), ILE->getNumInits()) : Args; | |||
| 3746 | ||||
| 3747 | // The type we're constructing needs to be complete. | |||
| 3748 | if (!S.isCompleteType(Kind.getLocation(), DestType)) { | |||
| 3749 | Sequence.setIncompleteTypeFailure(DestType); | |||
| 3750 | return; | |||
| 3751 | } | |||
| 3752 | ||||
| 3753 | // C++17 [dcl.init]p17: | |||
| 3754 | // - If the initializer expression is a prvalue and the cv-unqualified | |||
| 3755 | // version of the source type is the same class as the class of the | |||
| 3756 | // destination, the initializer expression is used to initialize the | |||
| 3757 | // destination object. | |||
| 3758 | // Per DR (no number yet), this does not apply when initializing a base | |||
| 3759 | // class or delegating to another constructor from a mem-initializer. | |||
| 3760 | // ObjC++: Lambda captured by the block in the lambda to block conversion | |||
| 3761 | // should avoid copy elision. | |||
| 3762 | if (S.getLangOpts().CPlusPlus17 && | |||
| 3763 | Entity.getKind() != InitializedEntity::EK_Base && | |||
| 3764 | Entity.getKind() != InitializedEntity::EK_Delegating && | |||
| 3765 | Entity.getKind() != | |||
| 3766 | InitializedEntity::EK_LambdaToBlockConversionBlockElement && | |||
| 3767 | UnwrappedArgs.size() == 1 && UnwrappedArgs[0]->isRValue() && | |||
| 3768 | S.Context.hasSameUnqualifiedType(UnwrappedArgs[0]->getType(), DestType)) { | |||
| 3769 | // Convert qualifications if necessary. | |||
| 3770 | Sequence.AddQualificationConversionStep(DestType, VK_RValue); | |||
| 3771 | if (ILE) | |||
| 3772 | Sequence.RewrapReferenceInitList(DestType, ILE); | |||
| 3773 | return; | |||
| 3774 | } | |||
| 3775 | ||||
| 3776 | const RecordType *DestRecordType = DestType->getAs<RecordType>(); | |||
| 3777 | assert(DestRecordType && "Constructor initialization requires record type")(static_cast <bool> (DestRecordType && "Constructor initialization requires record type" ) ? void (0) : __assert_fail ("DestRecordType && \"Constructor initialization requires record type\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3777, __extension__ __PRETTY_FUNCTION__)); | |||
| 3778 | CXXRecordDecl *DestRecordDecl | |||
| 3779 | = cast<CXXRecordDecl>(DestRecordType->getDecl()); | |||
| 3780 | ||||
| 3781 | // Build the candidate set directly in the initialization sequence | |||
| 3782 | // structure, so that it will persist if we fail. | |||
| 3783 | OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet(); | |||
| 3784 | ||||
| 3785 | // Determine whether we are allowed to call explicit constructors or | |||
| 3786 | // explicit conversion operators. | |||
| 3787 | bool AllowExplicit = Kind.AllowExplicit() || IsListInit; | |||
| 3788 | bool CopyInitialization = Kind.getKind() == InitializationKind::IK_Copy; | |||
| 3789 | ||||
| 3790 | // - Otherwise, if T is a class type, constructors are considered. The | |||
| 3791 | // applicable constructors are enumerated, and the best one is chosen | |||
| 3792 | // through overload resolution. | |||
| 3793 | DeclContext::lookup_result Ctors = S.LookupConstructors(DestRecordDecl); | |||
| 3794 | ||||
| 3795 | OverloadingResult Result = OR_No_Viable_Function; | |||
| 3796 | OverloadCandidateSet::iterator Best; | |||
| 3797 | bool AsInitializerList = false; | |||
| 3798 | ||||
| 3799 | // C++11 [over.match.list]p1, per DR1467: | |||
| 3800 | // When objects of non-aggregate type T are list-initialized, such that | |||
| 3801 | // 8.5.4 [dcl.init.list] specifies that overload resolution is performed | |||
| 3802 | // according to the rules in this section, overload resolution selects | |||
| 3803 | // the constructor in two phases: | |||
| 3804 | // | |||
| 3805 | // - Initially, the candidate functions are the initializer-list | |||
| 3806 | // constructors of the class T and the argument list consists of the | |||
| 3807 | // initializer list as a single argument. | |||
| 3808 | if (IsListInit) { | |||
| 3809 | AsInitializerList = true; | |||
| 3810 | ||||
| 3811 | // If the initializer list has no elements and T has a default constructor, | |||
| 3812 | // the first phase is omitted. | |||
| 3813 | if (!(UnwrappedArgs.empty() && DestRecordDecl->hasDefaultConstructor())) | |||
| 3814 | Result = ResolveConstructorOverload(S, Kind.getLocation(), Args, | |||
| 3815 | CandidateSet, DestType, Ctors, Best, | |||
| 3816 | CopyInitialization, AllowExplicit, | |||
| 3817 | /*OnlyListConstructor=*/true, | |||
| 3818 | IsListInit); | |||
| 3819 | } | |||
| 3820 | ||||
| 3821 | // C++11 [over.match.list]p1: | |||
| 3822 | // - If no viable initializer-list constructor is found, overload resolution | |||
| 3823 | // is performed again, where the candidate functions are all the | |||
| 3824 | // constructors of the class T and the argument list consists of the | |||
| 3825 | // elements of the initializer list. | |||
| 3826 | if (Result == OR_No_Viable_Function) { | |||
| 3827 | AsInitializerList = false; | |||
| 3828 | Result = ResolveConstructorOverload(S, Kind.getLocation(), UnwrappedArgs, | |||
| 3829 | CandidateSet, DestType, Ctors, Best, | |||
| 3830 | CopyInitialization, AllowExplicit, | |||
| 3831 | /*OnlyListConstructors=*/false, | |||
| 3832 | IsListInit); | |||
| 3833 | } | |||
| 3834 | if (Result) { | |||
| 3835 | Sequence.SetOverloadFailure(IsListInit ? | |||
| 3836 | InitializationSequence::FK_ListConstructorOverloadFailed : | |||
| 3837 | InitializationSequence::FK_ConstructorOverloadFailed, | |||
| 3838 | Result); | |||
| 3839 | return; | |||
| 3840 | } | |||
| 3841 | ||||
| 3842 | bool HadMultipleCandidates = (CandidateSet.size() > 1); | |||
| 3843 | ||||
| 3844 | // In C++17, ResolveConstructorOverload can select a conversion function | |||
| 3845 | // instead of a constructor. | |||
| 3846 | if (auto *CD = dyn_cast<CXXConversionDecl>(Best->Function)) { | |||
| 3847 | // Add the user-defined conversion step that calls the conversion function. | |||
| 3848 | QualType ConvType = CD->getConversionType(); | |||
| 3849 | assert(S.Context.hasSameUnqualifiedType(ConvType, DestType) &&(static_cast <bool> (S.Context.hasSameUnqualifiedType(ConvType , DestType) && "should not have selected this conversion function" ) ? void (0) : __assert_fail ("S.Context.hasSameUnqualifiedType(ConvType, DestType) && \"should not have selected this conversion function\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3850, __extension__ __PRETTY_FUNCTION__)) | |||
| 3850 | "should not have selected this conversion function")(static_cast <bool> (S.Context.hasSameUnqualifiedType(ConvType , DestType) && "should not have selected this conversion function" ) ? void (0) : __assert_fail ("S.Context.hasSameUnqualifiedType(ConvType, DestType) && \"should not have selected this conversion function\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 3850, __extension__ __PRETTY_FUNCTION__)); | |||
| 3851 | Sequence.AddUserConversionStep(CD, Best->FoundDecl, ConvType, | |||
| 3852 | HadMultipleCandidates); | |||
| 3853 | if (!S.Context.hasSameType(ConvType, DestType)) | |||
| 3854 | Sequence.AddQualificationConversionStep(DestType, VK_RValue); | |||
| 3855 | if (IsListInit) | |||
| 3856 | Sequence.RewrapReferenceInitList(Entity.getType(), ILE); | |||
| 3857 | return; | |||
| 3858 | } | |||
| 3859 | ||||
| 3860 | // C++11 [dcl.init]p6: | |||
| 3861 | // If a program calls for the default initialization of an object | |||
| 3862 | // of a const-qualified type T, T shall be a class type with a | |||
| 3863 | // user-provided default constructor. | |||
| 3864 | // C++ core issue 253 proposal: | |||
| 3865 | // If the implicit default constructor initializes all subobjects, no | |||
| 3866 | // initializer should be required. | |||
| 3867 | // The 253 proposal is for example needed to process libstdc++ headers in 5.x. | |||
| 3868 | CXXConstructorDecl *CtorDecl = cast<CXXConstructorDecl>(Best->Function); | |||
| 3869 | if (Kind.getKind() == InitializationKind::IK_Default && | |||
| 3870 | Entity.getType().isConstQualified()) { | |||
| 3871 | if (!CtorDecl->getParent()->allowConstDefaultInit()) { | |||
| 3872 | if (!maybeRecoverWithZeroInitialization(S, Sequence, Entity)) | |||
| 3873 | Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst); | |||
| 3874 | return; | |||
| 3875 | } | |||
| 3876 | } | |||
| 3877 | ||||
| 3878 | // C++11 [over.match.list]p1: | |||
| 3879 | // In copy-list-initialization, if an explicit constructor is chosen, the | |||
| 3880 | // initializer is ill-formed. | |||
| 3881 | if (IsListInit && !Kind.AllowExplicit() && CtorDecl->isExplicit()) { | |||
| 3882 | Sequence.SetFailed(InitializationSequence::FK_ExplicitConstructor); | |||
| 3883 | return; | |||
| 3884 | } | |||
| 3885 | ||||
| 3886 | // Add the constructor initialization step. Any cv-qualification conversion is | |||
| 3887 | // subsumed by the initialization. | |||
| 3888 | Sequence.AddConstructorInitializationStep( | |||
| 3889 | Best->FoundDecl, CtorDecl, DestArrayType, HadMultipleCandidates, | |||
| 3890 | IsListInit | IsInitListCopy, AsInitializerList); | |||
| 3891 | } | |||
| 3892 | ||||
| 3893 | static bool | |||
| 3894 | ResolveOverloadedFunctionForReferenceBinding(Sema &S, | |||
| 3895 | Expr *Initializer, | |||
| 3896 | QualType &SourceType, | |||
| 3897 | QualType &UnqualifiedSourceType, | |||
| 3898 | QualType UnqualifiedTargetType, | |||
| 3899 | InitializationSequence &Sequence) { | |||
| 3900 | if (S.Context.getCanonicalType(UnqualifiedSourceType) == | |||
| 3901 | S.Context.OverloadTy) { | |||
| 3902 | DeclAccessPair Found; | |||
| 3903 | bool HadMultipleCandidates = false; | |||
| 3904 | if (FunctionDecl *Fn | |||
| 3905 | = S.ResolveAddressOfOverloadedFunction(Initializer, | |||
| 3906 | UnqualifiedTargetType, | |||
| 3907 | false, Found, | |||
| 3908 | &HadMultipleCandidates)) { | |||
| 3909 | Sequence.AddAddressOverloadResolutionStep(Fn, Found, | |||
| 3910 | HadMultipleCandidates); | |||
| 3911 | SourceType = Fn->getType(); | |||
| 3912 | UnqualifiedSourceType = SourceType.getUnqualifiedType(); | |||
| 3913 | } else if (!UnqualifiedTargetType->isRecordType()) { | |||
| 3914 | Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed); | |||
| 3915 | return true; | |||
| 3916 | } | |||
| 3917 | } | |||
| 3918 | return false; | |||
| 3919 | } | |||
| 3920 | ||||
| 3921 | static void TryReferenceInitializationCore(Sema &S, | |||
| 3922 | const InitializedEntity &Entity, | |||
| 3923 | const InitializationKind &Kind, | |||
| 3924 | Expr *Initializer, | |||
| 3925 | QualType cv1T1, QualType T1, | |||
| 3926 | Qualifiers T1Quals, | |||
| 3927 | QualType cv2T2, QualType T2, | |||
| 3928 | Qualifiers T2Quals, | |||
| 3929 | InitializationSequence &Sequence); | |||
| 3930 | ||||
| 3931 | static void TryValueInitialization(Sema &S, | |||
| 3932 | const InitializedEntity &Entity, | |||
| 3933 | const InitializationKind &Kind, | |||
| 3934 | InitializationSequence &Sequence, | |||
| 3935 | InitListExpr *InitList = nullptr); | |||
| 3936 | ||||
| 3937 | /// Attempt list initialization of a reference. | |||
| 3938 | static void TryReferenceListInitialization(Sema &S, | |||
| 3939 | const InitializedEntity &Entity, | |||
| 3940 | const InitializationKind &Kind, | |||
| 3941 | InitListExpr *InitList, | |||
| 3942 | InitializationSequence &Sequence, | |||
| 3943 | bool TreatUnavailableAsInvalid) { | |||
| 3944 | // First, catch C++03 where this isn't possible. | |||
| 3945 | if (!S.getLangOpts().CPlusPlus11) { | |||
| 3946 | Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList); | |||
| 3947 | return; | |||
| 3948 | } | |||
| 3949 | // Can't reference initialize a compound literal. | |||
| 3950 | if (Entity.getKind() == InitializedEntity::EK_CompoundLiteralInit) { | |||
| 3951 | Sequence.SetFailed(InitializationSequence::FK_ReferenceBindingToInitList); | |||
| 3952 | return; | |||
| 3953 | } | |||
| 3954 | ||||
| 3955 | QualType DestType = Entity.getType(); | |||
| 3956 | QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType(); | |||
| 3957 | Qualifiers T1Quals; | |||
| 3958 | QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals); | |||
| 3959 | ||||
| 3960 | // Reference initialization via an initializer list works thus: | |||
| 3961 | // If the initializer list consists of a single element that is | |||
| 3962 | // reference-related to the referenced type, bind directly to that element | |||
| 3963 | // (possibly creating temporaries). | |||
| 3964 | // Otherwise, initialize a temporary with the initializer list and | |||
| 3965 | // bind to that. | |||
| 3966 | if (InitList->getNumInits() == 1) { | |||
| 3967 | Expr *Initializer = InitList->getInit(0); | |||
| 3968 | QualType cv2T2 = Initializer->getType(); | |||
| 3969 | Qualifiers T2Quals; | |||
| 3970 | QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals); | |||
| 3971 | ||||
| 3972 | // If this fails, creating a temporary wouldn't work either. | |||
| 3973 | if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2, | |||
| 3974 | T1, Sequence)) | |||
| 3975 | return; | |||
| 3976 | ||||
| 3977 | SourceLocation DeclLoc = Initializer->getLocStart(); | |||
| 3978 | bool dummy1, dummy2, dummy3; | |||
| 3979 | Sema::ReferenceCompareResult RefRelationship | |||
| 3980 | = S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2, dummy1, | |||
| 3981 | dummy2, dummy3); | |||
| 3982 | if (RefRelationship >= Sema::Ref_Related) { | |||
| 3983 | // Try to bind the reference here. | |||
| 3984 | TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1, | |||
| 3985 | T1Quals, cv2T2, T2, T2Quals, Sequence); | |||
| 3986 | if (Sequence) | |||
| 3987 | Sequence.RewrapReferenceInitList(cv1T1, InitList); | |||
| 3988 | return; | |||
| 3989 | } | |||
| 3990 | ||||
| 3991 | // Update the initializer if we've resolved an overloaded function. | |||
| 3992 | if (Sequence.step_begin() != Sequence.step_end()) | |||
| 3993 | Sequence.RewrapReferenceInitList(cv1T1, InitList); | |||
| 3994 | } | |||
| 3995 | ||||
| 3996 | // Not reference-related. Create a temporary and bind to that. | |||
| 3997 | InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(cv1T1); | |||
| 3998 | ||||
| 3999 | TryListInitialization(S, TempEntity, Kind, InitList, Sequence, | |||
| 4000 | TreatUnavailableAsInvalid); | |||
| 4001 | if (Sequence) { | |||
| 4002 | if (DestType->isRValueReferenceType() || | |||
| 4003 | (T1Quals.hasConst() && !T1Quals.hasVolatile())) | |||
| 4004 | Sequence.AddReferenceBindingStep(cv1T1, /*bindingTemporary=*/true); | |||
| 4005 | else | |||
| 4006 | Sequence.SetFailed( | |||
| 4007 | InitializationSequence::FK_NonConstLValueReferenceBindingToTemporary); | |||
| 4008 | } | |||
| 4009 | } | |||
| 4010 | ||||
| 4011 | /// Attempt list initialization (C++0x [dcl.init.list]) | |||
| 4012 | static void TryListInitialization(Sema &S, | |||
| 4013 | const InitializedEntity &Entity, | |||
| 4014 | const InitializationKind &Kind, | |||
| 4015 | InitListExpr *InitList, | |||
| 4016 | InitializationSequence &Sequence, | |||
| 4017 | bool TreatUnavailableAsInvalid) { | |||
| 4018 | QualType DestType = Entity.getType(); | |||
| 4019 | ||||
| 4020 | // C++ doesn't allow scalar initialization with more than one argument. | |||
| 4021 | // But C99 complex numbers are scalars and it makes sense there. | |||
| 4022 | if (S.getLangOpts().CPlusPlus && DestType->isScalarType() && | |||
| 4023 | !DestType->isAnyComplexType() && InitList->getNumInits() > 1) { | |||
| 4024 | Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForScalar); | |||
| 4025 | return; | |||
| 4026 | } | |||
| 4027 | if (DestType->isReferenceType()) { | |||
| 4028 | TryReferenceListInitialization(S, Entity, Kind, InitList, Sequence, | |||
| 4029 | TreatUnavailableAsInvalid); | |||
| 4030 | return; | |||
| 4031 | } | |||
| 4032 | ||||
| 4033 | if (DestType->isRecordType() && | |||
| 4034 | !S.isCompleteType(InitList->getLocStart(), DestType)) { | |||
| 4035 | Sequence.setIncompleteTypeFailure(DestType); | |||
| 4036 | return; | |||
| 4037 | } | |||
| 4038 | ||||
| 4039 | // C++11 [dcl.init.list]p3, per DR1467: | |||
| 4040 | // - If T is a class type and the initializer list has a single element of | |||
| 4041 | // type cv U, where U is T or a class derived from T, the object is | |||
| 4042 | // initialized from that element (by copy-initialization for | |||
| 4043 | // copy-list-initialization, or by direct-initialization for | |||
| 4044 | // direct-list-initialization). | |||
| 4045 | // - Otherwise, if T is a character array and the initializer list has a | |||
| 4046 | // single element that is an appropriately-typed string literal | |||
| 4047 | // (8.5.2 [dcl.init.string]), initialization is performed as described | |||
| 4048 | // in that section. | |||
| 4049 | // - Otherwise, if T is an aggregate, [...] (continue below). | |||
| 4050 | if (S.getLangOpts().CPlusPlus11 && InitList->getNumInits() == 1) { | |||
| 4051 | if (DestType->isRecordType()) { | |||
| 4052 | QualType InitType = InitList->getInit(0)->getType(); | |||
| 4053 | if (S.Context.hasSameUnqualifiedType(InitType, DestType) || | |||
| 4054 | S.IsDerivedFrom(InitList->getLocStart(), InitType, DestType)) { | |||
| 4055 | Expr *InitListAsExpr = InitList; | |||
| 4056 | TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType, | |||
| 4057 | DestType, Sequence, | |||
| 4058 | /*InitListSyntax*/false, | |||
| 4059 | /*IsInitListCopy*/true); | |||
| 4060 | return; | |||
| 4061 | } | |||
| 4062 | } | |||
| 4063 | if (const ArrayType *DestAT = S.Context.getAsArrayType(DestType)) { | |||
| 4064 | Expr *SubInit[1] = {InitList->getInit(0)}; | |||
| 4065 | if (!isa<VariableArrayType>(DestAT) && | |||
| 4066 | IsStringInit(SubInit[0], DestAT, S.Context) == SIF_None) { | |||
| 4067 | InitializationKind SubKind = | |||
| 4068 | Kind.getKind() == InitializationKind::IK_DirectList | |||
| 4069 | ? InitializationKind::CreateDirect(Kind.getLocation(), | |||
| 4070 | InitList->getLBraceLoc(), | |||
| 4071 | InitList->getRBraceLoc()) | |||
| 4072 | : Kind; | |||
| 4073 | Sequence.InitializeFrom(S, Entity, SubKind, SubInit, | |||
| 4074 | /*TopLevelOfInitList*/ true, | |||
| 4075 | TreatUnavailableAsInvalid); | |||
| 4076 | ||||
| 4077 | // TryStringLiteralInitialization() (in InitializeFrom()) will fail if | |||
| 4078 | // the element is not an appropriately-typed string literal, in which | |||
| 4079 | // case we should proceed as in C++11 (below). | |||
| 4080 | if (Sequence) { | |||
| 4081 | Sequence.RewrapReferenceInitList(Entity.getType(), InitList); | |||
| 4082 | return; | |||
| 4083 | } | |||
| 4084 | } | |||
| 4085 | } | |||
| 4086 | } | |||
| 4087 | ||||
| 4088 | // C++11 [dcl.init.list]p3: | |||
| 4089 | // - If T is an aggregate, aggregate initialization is performed. | |||
| 4090 | if ((DestType->isRecordType() && !DestType->isAggregateType()) || | |||
| 4091 | (S.getLangOpts().CPlusPlus11 && | |||
| 4092 | S.isStdInitializerList(DestType, nullptr))) { | |||
| 4093 | if (S.getLangOpts().CPlusPlus11) { | |||
| 4094 | // - Otherwise, if the initializer list has no elements and T is a | |||
| 4095 | // class type with a default constructor, the object is | |||
| 4096 | // value-initialized. | |||
| 4097 | if (InitList->getNumInits() == 0) { | |||
| 4098 | CXXRecordDecl *RD = DestType->getAsCXXRecordDecl(); | |||
| 4099 | if (RD->hasDefaultConstructor()) { | |||
| 4100 | TryValueInitialization(S, Entity, Kind, Sequence, InitList); | |||
| 4101 | return; | |||
| 4102 | } | |||
| 4103 | } | |||
| 4104 | ||||
| 4105 | // - Otherwise, if T is a specialization of std::initializer_list<E>, | |||
| 4106 | // an initializer_list object constructed [...] | |||
| 4107 | if (TryInitializerListConstruction(S, InitList, DestType, Sequence, | |||
| 4108 | TreatUnavailableAsInvalid)) | |||
| 4109 | return; | |||
| 4110 | ||||
| 4111 | // - Otherwise, if T is a class type, constructors are considered. | |||
| 4112 | Expr *InitListAsExpr = InitList; | |||
| 4113 | TryConstructorInitialization(S, Entity, Kind, InitListAsExpr, DestType, | |||
| 4114 | DestType, Sequence, /*InitListSyntax*/true); | |||
| 4115 | } else | |||
| 4116 | Sequence.SetFailed(InitializationSequence::FK_InitListBadDestinationType); | |||
| 4117 | return; | |||
| 4118 | } | |||
| 4119 | ||||
| 4120 | if (S.getLangOpts().CPlusPlus && !DestType->isAggregateType() && | |||
| 4121 | InitList->getNumInits() == 1) { | |||
| 4122 | Expr *E = InitList->getInit(0); | |||
| 4123 | ||||
| 4124 | // - Otherwise, if T is an enumeration with a fixed underlying type, | |||
| 4125 | // the initializer-list has a single element v, and the initialization | |||
| 4126 | // is direct-list-initialization, the object is initialized with the | |||
| 4127 | // value T(v); if a narrowing conversion is required to convert v to | |||
| 4128 | // the underlying type of T, the program is ill-formed. | |||
| 4129 | auto *ET = DestType->getAs<EnumType>(); | |||
| 4130 | if (S.getLangOpts().CPlusPlus17 && | |||
| 4131 | Kind.getKind() == InitializationKind::IK_DirectList && | |||
| 4132 | ET && ET->getDecl()->isFixed() && | |||
| 4133 | !S.Context.hasSameUnqualifiedType(E->getType(), DestType) && | |||
| 4134 | (E->getType()->isIntegralOrEnumerationType() || | |||
| 4135 | E->getType()->isFloatingType())) { | |||
| 4136 | // There are two ways that T(v) can work when T is an enumeration type. | |||
| 4137 | // If there is either an implicit conversion sequence from v to T or | |||
| 4138 | // a conversion function that can convert from v to T, then we use that. | |||
| 4139 | // Otherwise, if v is of integral, enumeration, or floating-point type, | |||
| 4140 | // it is converted to the enumeration type via its underlying type. | |||
| 4141 | // There is no overlap possible between these two cases (except when the | |||
| 4142 | // source value is already of the destination type), and the first | |||
| 4143 | // case is handled by the general case for single-element lists below. | |||
| 4144 | ImplicitConversionSequence ICS; | |||
| 4145 | ICS.setStandard(); | |||
| 4146 | ICS.Standard.setAsIdentityConversion(); | |||
| 4147 | if (!E->isRValue()) | |||
| 4148 | ICS.Standard.First = ICK_Lvalue_To_Rvalue; | |||
| 4149 | // If E is of a floating-point type, then the conversion is ill-formed | |||
| 4150 | // due to narrowing, but go through the motions in order to produce the | |||
| 4151 | // right diagnostic. | |||
| 4152 | ICS.Standard.Second = E->getType()->isFloatingType() | |||
| 4153 | ? ICK_Floating_Integral | |||
| 4154 | : ICK_Integral_Conversion; | |||
| 4155 | ICS.Standard.setFromType(E->getType()); | |||
| 4156 | ICS.Standard.setToType(0, E->getType()); | |||
| 4157 | ICS.Standard.setToType(1, DestType); | |||
| 4158 | ICS.Standard.setToType(2, DestType); | |||
| 4159 | Sequence.AddConversionSequenceStep(ICS, ICS.Standard.getToType(2), | |||
| 4160 | /*TopLevelOfInitList*/true); | |||
| 4161 | Sequence.RewrapReferenceInitList(Entity.getType(), InitList); | |||
| 4162 | return; | |||
| 4163 | } | |||
| 4164 | ||||
| 4165 | // - Otherwise, if the initializer list has a single element of type E | |||
| 4166 | // [...references are handled above...], the object or reference is | |||
| 4167 | // initialized from that element (by copy-initialization for | |||
| 4168 | // copy-list-initialization, or by direct-initialization for | |||
| 4169 | // direct-list-initialization); if a narrowing conversion is required | |||
| 4170 | // to convert the element to T, the program is ill-formed. | |||
| 4171 | // | |||
| 4172 | // Per core-24034, this is direct-initialization if we were performing | |||
| 4173 | // direct-list-initialization and copy-initialization otherwise. | |||
| 4174 | // We can't use InitListChecker for this, because it always performs | |||
| 4175 | // copy-initialization. This only matters if we might use an 'explicit' | |||
| 4176 | // conversion operator, so we only need to handle the cases where the source | |||
| 4177 | // is of record type. | |||
| 4178 | if (InitList->getInit(0)->getType()->isRecordType()) { | |||
| 4179 | InitializationKind SubKind = | |||
| 4180 | Kind.getKind() == InitializationKind::IK_DirectList | |||
| 4181 | ? InitializationKind::CreateDirect(Kind.getLocation(), | |||
| 4182 | InitList->getLBraceLoc(), | |||
| 4183 | InitList->getRBraceLoc()) | |||
| 4184 | : Kind; | |||
| 4185 | Expr *SubInit[1] = { InitList->getInit(0) }; | |||
| 4186 | Sequence.InitializeFrom(S, Entity, SubKind, SubInit, | |||
| 4187 | /*TopLevelOfInitList*/true, | |||
| 4188 | TreatUnavailableAsInvalid); | |||
| 4189 | if (Sequence) | |||
| 4190 | Sequence.RewrapReferenceInitList(Entity.getType(), InitList); | |||
| 4191 | return; | |||
| 4192 | } | |||
| 4193 | } | |||
| 4194 | ||||
| 4195 | InitListChecker CheckInitList(S, Entity, InitList, | |||
| 4196 | DestType, /*VerifyOnly=*/true, TreatUnavailableAsInvalid); | |||
| 4197 | if (CheckInitList.HadError()) { | |||
| 4198 | Sequence.SetFailed(InitializationSequence::FK_ListInitializationFailed); | |||
| 4199 | return; | |||
| 4200 | } | |||
| 4201 | ||||
| 4202 | // Add the list initialization step with the built init list. | |||
| 4203 | Sequence.AddListInitializationStep(DestType); | |||
| 4204 | } | |||
| 4205 | ||||
| 4206 | /// Try a reference initialization that involves calling a conversion | |||
| 4207 | /// function. | |||
| 4208 | static OverloadingResult TryRefInitWithConversionFunction( | |||
| 4209 | Sema &S, const InitializedEntity &Entity, const InitializationKind &Kind, | |||
| 4210 | Expr *Initializer, bool AllowRValues, bool IsLValueRef, | |||
| 4211 | InitializationSequence &Sequence) { | |||
| 4212 | QualType DestType = Entity.getType(); | |||
| 4213 | QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType(); | |||
| 4214 | QualType T1 = cv1T1.getUnqualifiedType(); | |||
| 4215 | QualType cv2T2 = Initializer->getType(); | |||
| 4216 | QualType T2 = cv2T2.getUnqualifiedType(); | |||
| 4217 | ||||
| 4218 | bool DerivedToBase; | |||
| 4219 | bool ObjCConversion; | |||
| 4220 | bool ObjCLifetimeConversion; | |||
| 4221 | assert(!S.CompareReferenceRelationship(Initializer->getLocStart(),(static_cast <bool> (!S.CompareReferenceRelationship(Initializer ->getLocStart(), T1, T2, DerivedToBase, ObjCConversion, ObjCLifetimeConversion ) && "Must have incompatible references when binding via conversion" ) ? void (0) : __assert_fail ("!S.CompareReferenceRelationship(Initializer->getLocStart(), T1, T2, DerivedToBase, ObjCConversion, ObjCLifetimeConversion) && \"Must have incompatible references when binding via conversion\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4225, __extension__ __PRETTY_FUNCTION__)) | |||
| 4222 | T1, T2, DerivedToBase,(static_cast <bool> (!S.CompareReferenceRelationship(Initializer ->getLocStart(), T1, T2, DerivedToBase, ObjCConversion, ObjCLifetimeConversion ) && "Must have incompatible references when binding via conversion" ) ? void (0) : __assert_fail ("!S.CompareReferenceRelationship(Initializer->getLocStart(), T1, T2, DerivedToBase, ObjCConversion, ObjCLifetimeConversion) && \"Must have incompatible references when binding via conversion\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4225, __extension__ __PRETTY_FUNCTION__)) | |||
| 4223 | ObjCConversion,(static_cast <bool> (!S.CompareReferenceRelationship(Initializer ->getLocStart(), T1, T2, DerivedToBase, ObjCConversion, ObjCLifetimeConversion ) && "Must have incompatible references when binding via conversion" ) ? void (0) : __assert_fail ("!S.CompareReferenceRelationship(Initializer->getLocStart(), T1, T2, DerivedToBase, ObjCConversion, ObjCLifetimeConversion) && \"Must have incompatible references when binding via conversion\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4225, __extension__ __PRETTY_FUNCTION__)) | |||
| 4224 | ObjCLifetimeConversion) &&(static_cast <bool> (!S.CompareReferenceRelationship(Initializer ->getLocStart(), T1, T2, DerivedToBase, ObjCConversion, ObjCLifetimeConversion ) && "Must have incompatible references when binding via conversion" ) ? void (0) : __assert_fail ("!S.CompareReferenceRelationship(Initializer->getLocStart(), T1, T2, DerivedToBase, ObjCConversion, ObjCLifetimeConversion) && \"Must have incompatible references when binding via conversion\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4225, __extension__ __PRETTY_FUNCTION__)) | |||
| 4225 | "Must have incompatible references when binding via conversion")(static_cast <bool> (!S.CompareReferenceRelationship(Initializer ->getLocStart(), T1, T2, DerivedToBase, ObjCConversion, ObjCLifetimeConversion ) && "Must have incompatible references when binding via conversion" ) ? void (0) : __assert_fail ("!S.CompareReferenceRelationship(Initializer->getLocStart(), T1, T2, DerivedToBase, ObjCConversion, ObjCLifetimeConversion) && \"Must have incompatible references when binding via conversion\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4225, __extension__ __PRETTY_FUNCTION__)); | |||
| 4226 | (void)DerivedToBase; | |||
| 4227 | (void)ObjCConversion; | |||
| 4228 | (void)ObjCLifetimeConversion; | |||
| 4229 | ||||
| 4230 | // Build the candidate set directly in the initialization sequence | |||
| 4231 | // structure, so that it will persist if we fail. | |||
| 4232 | OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet(); | |||
| 4233 | CandidateSet.clear(OverloadCandidateSet::CSK_InitByUserDefinedConversion); | |||
| 4234 | ||||
| 4235 | // Determine whether we are allowed to call explicit conversion operators. | |||
| 4236 | // Note that none of [over.match.copy], [over.match.conv], nor | |||
| 4237 | // [over.match.ref] permit an explicit constructor to be chosen when | |||
| 4238 | // initializing a reference, not even for direct-initialization. | |||
| 4239 | bool AllowExplicitCtors = false; | |||
| 4240 | bool AllowExplicitConvs = Kind.allowExplicitConversionFunctionsInRefBinding(); | |||
| 4241 | ||||
| 4242 | const RecordType *T1RecordType = nullptr; | |||
| 4243 | if (AllowRValues && (T1RecordType = T1->getAs<RecordType>()) && | |||
| 4244 | S.isCompleteType(Kind.getLocation(), T1)) { | |||
| 4245 | // The type we're converting to is a class type. Enumerate its constructors | |||
| 4246 | // to see if there is a suitable conversion. | |||
| 4247 | CXXRecordDecl *T1RecordDecl = cast<CXXRecordDecl>(T1RecordType->getDecl()); | |||
| 4248 | ||||
| 4249 | for (NamedDecl *D : S.LookupConstructors(T1RecordDecl)) { | |||
| 4250 | auto Info = getConstructorInfo(D); | |||
| 4251 | if (!Info.Constructor) | |||
| 4252 | continue; | |||
| 4253 | ||||
| 4254 | if (!Info.Constructor->isInvalidDecl() && | |||
| 4255 | Info.Constructor->isConvertingConstructor(AllowExplicitCtors)) { | |||
| 4256 | if (Info.ConstructorTmpl) | |||
| 4257 | S.AddTemplateOverloadCandidate(Info.ConstructorTmpl, Info.FoundDecl, | |||
| 4258 | /*ExplicitArgs*/ nullptr, | |||
| 4259 | Initializer, CandidateSet, | |||
| 4260 | /*SuppressUserConversions=*/true); | |||
| 4261 | else | |||
| 4262 | S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl, | |||
| 4263 | Initializer, CandidateSet, | |||
| 4264 | /*SuppressUserConversions=*/true); | |||
| 4265 | } | |||
| 4266 | } | |||
| 4267 | } | |||
| 4268 | if (T1RecordType && T1RecordType->getDecl()->isInvalidDecl()) | |||
| 4269 | return OR_No_Viable_Function; | |||
| 4270 | ||||
| 4271 | const RecordType *T2RecordType = nullptr; | |||
| 4272 | if ((T2RecordType = T2->getAs<RecordType>()) && | |||
| 4273 | S.isCompleteType(Kind.getLocation(), T2)) { | |||
| 4274 | // The type we're converting from is a class type, enumerate its conversion | |||
| 4275 | // functions. | |||
| 4276 | CXXRecordDecl *T2RecordDecl = cast<CXXRecordDecl>(T2RecordType->getDecl()); | |||
| 4277 | ||||
| 4278 | const auto &Conversions = T2RecordDecl->getVisibleConversionFunctions(); | |||
| 4279 | for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) { | |||
| 4280 | NamedDecl *D = *I; | |||
| 4281 | CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); | |||
| 4282 | if (isa<UsingShadowDecl>(D)) | |||
| 4283 | D = cast<UsingShadowDecl>(D)->getTargetDecl(); | |||
| 4284 | ||||
| 4285 | FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D); | |||
| 4286 | CXXConversionDecl *Conv; | |||
| 4287 | if (ConvTemplate) | |||
| 4288 | Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); | |||
| 4289 | else | |||
| 4290 | Conv = cast<CXXConversionDecl>(D); | |||
| 4291 | ||||
| 4292 | // If the conversion function doesn't return a reference type, | |||
| 4293 | // it can't be considered for this conversion unless we're allowed to | |||
| 4294 | // consider rvalues. | |||
| 4295 | // FIXME: Do we need to make sure that we only consider conversion | |||
| 4296 | // candidates with reference-compatible results? That might be needed to | |||
| 4297 | // break recursion. | |||
| 4298 | if ((AllowExplicitConvs || !Conv->isExplicit()) && | |||
| 4299 | (AllowRValues || Conv->getConversionType()->isLValueReferenceType())){ | |||
| 4300 | if (ConvTemplate) | |||
| 4301 | S.AddTemplateConversionCandidate(ConvTemplate, I.getPair(), | |||
| 4302 | ActingDC, Initializer, | |||
| 4303 | DestType, CandidateSet, | |||
| 4304 | /*AllowObjCConversionOnExplicit=*/ | |||
| 4305 | false); | |||
| 4306 | else | |||
| 4307 | S.AddConversionCandidate(Conv, I.getPair(), ActingDC, | |||
| 4308 | Initializer, DestType, CandidateSet, | |||
| 4309 | /*AllowObjCConversionOnExplicit=*/false); | |||
| 4310 | } | |||
| 4311 | } | |||
| 4312 | } | |||
| 4313 | if (T2RecordType && T2RecordType->getDecl()->isInvalidDecl()) | |||
| 4314 | return OR_No_Viable_Function; | |||
| 4315 | ||||
| 4316 | SourceLocation DeclLoc = Initializer->getLocStart(); | |||
| 4317 | ||||
| 4318 | // Perform overload resolution. If it fails, return the failed result. | |||
| 4319 | OverloadCandidateSet::iterator Best; | |||
| 4320 | if (OverloadingResult Result | |||
| 4321 | = CandidateSet.BestViableFunction(S, DeclLoc, Best)) | |||
| 4322 | return Result; | |||
| 4323 | ||||
| 4324 | FunctionDecl *Function = Best->Function; | |||
| 4325 | // This is the overload that will be used for this initialization step if we | |||
| 4326 | // use this initialization. Mark it as referenced. | |||
| 4327 | Function->setReferenced(); | |||
| 4328 | ||||
| 4329 | // Compute the returned type and value kind of the conversion. | |||
| 4330 | QualType cv3T3; | |||
| 4331 | if (isa<CXXConversionDecl>(Function)) | |||
| 4332 | cv3T3 = Function->getReturnType(); | |||
| 4333 | else | |||
| 4334 | cv3T3 = T1; | |||
| 4335 | ||||
| 4336 | ExprValueKind VK = VK_RValue; | |||
| 4337 | if (cv3T3->isLValueReferenceType()) | |||
| 4338 | VK = VK_LValue; | |||
| 4339 | else if (const auto *RRef = cv3T3->getAs<RValueReferenceType>()) | |||
| 4340 | VK = RRef->getPointeeType()->isFunctionType() ? VK_LValue : VK_XValue; | |||
| 4341 | cv3T3 = cv3T3.getNonLValueExprType(S.Context); | |||
| 4342 | ||||
| 4343 | // Add the user-defined conversion step. | |||
| 4344 | bool HadMultipleCandidates = (CandidateSet.size() > 1); | |||
| 4345 | Sequence.AddUserConversionStep(Function, Best->FoundDecl, cv3T3, | |||
| 4346 | HadMultipleCandidates); | |||
| 4347 | ||||
| 4348 | // Determine whether we'll need to perform derived-to-base adjustments or | |||
| 4349 | // other conversions. | |||
| 4350 | bool NewDerivedToBase = false; | |||
| 4351 | bool NewObjCConversion = false; | |||
| 4352 | bool NewObjCLifetimeConversion = false; | |||
| 4353 | Sema::ReferenceCompareResult NewRefRelationship | |||
| 4354 | = S.CompareReferenceRelationship(DeclLoc, T1, cv3T3, | |||
| 4355 | NewDerivedToBase, NewObjCConversion, | |||
| 4356 | NewObjCLifetimeConversion); | |||
| 4357 | ||||
| 4358 | // Add the final conversion sequence, if necessary. | |||
| 4359 | if (NewRefRelationship == Sema::Ref_Incompatible) { | |||
| 4360 | assert(!isa<CXXConstructorDecl>(Function) &&(static_cast <bool> (!isa<CXXConstructorDecl>(Function ) && "should not have conversion after constructor") ? void (0) : __assert_fail ("!isa<CXXConstructorDecl>(Function) && \"should not have conversion after constructor\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4361, __extension__ __PRETTY_FUNCTION__)) | |||
| 4361 | "should not have conversion after constructor")(static_cast <bool> (!isa<CXXConstructorDecl>(Function ) && "should not have conversion after constructor") ? void (0) : __assert_fail ("!isa<CXXConstructorDecl>(Function) && \"should not have conversion after constructor\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4361, __extension__ __PRETTY_FUNCTION__)); | |||
| 4362 | ||||
| 4363 | ImplicitConversionSequence ICS; | |||
| 4364 | ICS.setStandard(); | |||
| 4365 | ICS.Standard = Best->FinalConversion; | |||
| 4366 | Sequence.AddConversionSequenceStep(ICS, ICS.Standard.getToType(2)); | |||
| 4367 | ||||
| 4368 | // Every implicit conversion results in a prvalue, except for a glvalue | |||
| 4369 | // derived-to-base conversion, which we handle below. | |||
| 4370 | cv3T3 = ICS.Standard.getToType(2); | |||
| 4371 | VK = VK_RValue; | |||
| 4372 | } | |||
| 4373 | ||||
| 4374 | // If the converted initializer is a prvalue, its type T4 is adjusted to | |||
| 4375 | // type "cv1 T4" and the temporary materialization conversion is applied. | |||
| 4376 | // | |||
| 4377 | // We adjust the cv-qualifications to match the reference regardless of | |||
| 4378 | // whether we have a prvalue so that the AST records the change. In this | |||
| 4379 | // case, T4 is "cv3 T3". | |||
| 4380 | QualType cv1T4 = S.Context.getQualifiedType(cv3T3, cv1T1.getQualifiers()); | |||
| 4381 | if (cv1T4.getQualifiers() != cv3T3.getQualifiers()) | |||
| 4382 | Sequence.AddQualificationConversionStep(cv1T4, VK); | |||
| 4383 | Sequence.AddReferenceBindingStep(cv1T4, VK == VK_RValue); | |||
| 4384 | VK = IsLValueRef ? VK_LValue : VK_XValue; | |||
| 4385 | ||||
| 4386 | if (NewDerivedToBase) | |||
| 4387 | Sequence.AddDerivedToBaseCastStep(cv1T1, VK); | |||
| 4388 | else if (NewObjCConversion) | |||
| 4389 | Sequence.AddObjCObjectConversionStep(cv1T1); | |||
| 4390 | ||||
| 4391 | return OR_Success; | |||
| 4392 | } | |||
| 4393 | ||||
| 4394 | static void CheckCXX98CompatAccessibleCopy(Sema &S, | |||
| 4395 | const InitializedEntity &Entity, | |||
| 4396 | Expr *CurInitExpr); | |||
| 4397 | ||||
| 4398 | /// Attempt reference initialization (C++0x [dcl.init.ref]) | |||
| 4399 | static void TryReferenceInitialization(Sema &S, | |||
| 4400 | const InitializedEntity &Entity, | |||
| 4401 | const InitializationKind &Kind, | |||
| 4402 | Expr *Initializer, | |||
| 4403 | InitializationSequence &Sequence) { | |||
| 4404 | QualType DestType = Entity.getType(); | |||
| 4405 | QualType cv1T1 = DestType->getAs<ReferenceType>()->getPointeeType(); | |||
| 4406 | Qualifiers T1Quals; | |||
| 4407 | QualType T1 = S.Context.getUnqualifiedArrayType(cv1T1, T1Quals); | |||
| 4408 | QualType cv2T2 = Initializer->getType(); | |||
| 4409 | Qualifiers T2Quals; | |||
| 4410 | QualType T2 = S.Context.getUnqualifiedArrayType(cv2T2, T2Quals); | |||
| 4411 | ||||
| 4412 | // If the initializer is the address of an overloaded function, try | |||
| 4413 | // to resolve the overloaded function. If all goes well, T2 is the | |||
| 4414 | // type of the resulting function. | |||
| 4415 | if (ResolveOverloadedFunctionForReferenceBinding(S, Initializer, cv2T2, T2, | |||
| 4416 | T1, Sequence)) | |||
| 4417 | return; | |||
| 4418 | ||||
| 4419 | // Delegate everything else to a subfunction. | |||
| 4420 | TryReferenceInitializationCore(S, Entity, Kind, Initializer, cv1T1, T1, | |||
| 4421 | T1Quals, cv2T2, T2, T2Quals, Sequence); | |||
| 4422 | } | |||
| 4423 | ||||
| 4424 | /// Determine whether an expression is a non-referenceable glvalue (one to | |||
| 4425 | /// which a reference can never bind). Attempting to bind a reference to | |||
| 4426 | /// such a glvalue will always create a temporary. | |||
| 4427 | static bool isNonReferenceableGLValue(Expr *E) { | |||
| 4428 | return E->refersToBitField() || E->refersToVectorElement(); | |||
| 4429 | } | |||
| 4430 | ||||
| 4431 | /// Reference initialization without resolving overloaded functions. | |||
| 4432 | static void TryReferenceInitializationCore(Sema &S, | |||
| 4433 | const InitializedEntity &Entity, | |||
| 4434 | const InitializationKind &Kind, | |||
| 4435 | Expr *Initializer, | |||
| 4436 | QualType cv1T1, QualType T1, | |||
| 4437 | Qualifiers T1Quals, | |||
| 4438 | QualType cv2T2, QualType T2, | |||
| 4439 | Qualifiers T2Quals, | |||
| 4440 | InitializationSequence &Sequence) { | |||
| 4441 | QualType DestType = Entity.getType(); | |||
| 4442 | SourceLocation DeclLoc = Initializer->getLocStart(); | |||
| 4443 | // Compute some basic properties of the types and the initializer. | |||
| 4444 | bool isLValueRef = DestType->isLValueReferenceType(); | |||
| 4445 | bool isRValueRef = !isLValueRef; | |||
| 4446 | bool DerivedToBase = false; | |||
| 4447 | bool ObjCConversion = false; | |||
| 4448 | bool ObjCLifetimeConversion = false; | |||
| 4449 | Expr::Classification InitCategory = Initializer->Classify(S.Context); | |||
| 4450 | Sema::ReferenceCompareResult RefRelationship | |||
| 4451 | = S.CompareReferenceRelationship(DeclLoc, cv1T1, cv2T2, DerivedToBase, | |||
| 4452 | ObjCConversion, ObjCLifetimeConversion); | |||
| 4453 | ||||
| 4454 | // C++0x [dcl.init.ref]p5: | |||
| 4455 | // A reference to type "cv1 T1" is initialized by an expression of type | |||
| 4456 | // "cv2 T2" as follows: | |||
| 4457 | // | |||
| 4458 | // - If the reference is an lvalue reference and the initializer | |||
| 4459 | // expression | |||
| 4460 | // Note the analogous bullet points for rvalue refs to functions. Because | |||
| 4461 | // there are no function rvalues in C++, rvalue refs to functions are treated | |||
| 4462 | // like lvalue refs. | |||
| 4463 | OverloadingResult ConvOvlResult = OR_Success; | |||
| 4464 | bool T1Function = T1->isFunctionType(); | |||
| 4465 | if (isLValueRef || T1Function) { | |||
| 4466 | if (InitCategory.isLValue() && !isNonReferenceableGLValue(Initializer) && | |||
| 4467 | (RefRelationship == Sema::Ref_Compatible || | |||
| 4468 | (Kind.isCStyleOrFunctionalCast() && | |||
| 4469 | RefRelationship == Sema::Ref_Related))) { | |||
| 4470 | // - is an lvalue (but is not a bit-field), and "cv1 T1" is | |||
| 4471 | // reference-compatible with "cv2 T2," or | |||
| 4472 | if (T1Quals != T2Quals) | |||
| 4473 | // Convert to cv1 T2. This should only add qualifiers unless this is a | |||
| 4474 | // c-style cast. The removal of qualifiers in that case notionally | |||
| 4475 | // happens after the reference binding, but that doesn't matter. | |||
| 4476 | Sequence.AddQualificationConversionStep( | |||
| 4477 | S.Context.getQualifiedType(T2, T1Quals), | |||
| 4478 | Initializer->getValueKind()); | |||
| 4479 | if (DerivedToBase) | |||
| 4480 | Sequence.AddDerivedToBaseCastStep(cv1T1, VK_LValue); | |||
| 4481 | else if (ObjCConversion) | |||
| 4482 | Sequence.AddObjCObjectConversionStep(cv1T1); | |||
| 4483 | ||||
| 4484 | // We only create a temporary here when binding a reference to a | |||
| 4485 | // bit-field or vector element. Those cases are't supposed to be | |||
| 4486 | // handled by this bullet, but the outcome is the same either way. | |||
| 4487 | Sequence.AddReferenceBindingStep(cv1T1, false); | |||
| 4488 | return; | |||
| 4489 | } | |||
| 4490 | ||||
| 4491 | // - has a class type (i.e., T2 is a class type), where T1 is not | |||
| 4492 | // reference-related to T2, and can be implicitly converted to an | |||
| 4493 | // lvalue of type "cv3 T3," where "cv1 T1" is reference-compatible | |||
| 4494 | // with "cv3 T3" (this conversion is selected by enumerating the | |||
| 4495 | // applicable conversion functions (13.3.1.6) and choosing the best | |||
| 4496 | // one through overload resolution (13.3)), | |||
| 4497 | // If we have an rvalue ref to function type here, the rhs must be | |||
| 4498 | // an rvalue. DR1287 removed the "implicitly" here. | |||
| 4499 | if (RefRelationship == Sema::Ref_Incompatible && T2->isRecordType() && | |||
| 4500 | (isLValueRef || InitCategory.isRValue())) { | |||
| 4501 | ConvOvlResult = TryRefInitWithConversionFunction( | |||
| 4502 | S, Entity, Kind, Initializer, /*AllowRValues*/ isRValueRef, | |||
| 4503 | /*IsLValueRef*/ isLValueRef, Sequence); | |||
| 4504 | if (ConvOvlResult == OR_Success) | |||
| 4505 | return; | |||
| 4506 | if (ConvOvlResult != OR_No_Viable_Function) | |||
| 4507 | Sequence.SetOverloadFailure( | |||
| 4508 | InitializationSequence::FK_ReferenceInitOverloadFailed, | |||
| 4509 | ConvOvlResult); | |||
| 4510 | } | |||
| 4511 | } | |||
| 4512 | ||||
| 4513 | // - Otherwise, the reference shall be an lvalue reference to a | |||
| 4514 | // non-volatile const type (i.e., cv1 shall be const), or the reference | |||
| 4515 | // shall be an rvalue reference. | |||
| 4516 | if (isLValueRef && !(T1Quals.hasConst() && !T1Quals.hasVolatile())) { | |||
| 4517 | if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy) | |||
| 4518 | Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed); | |||
| 4519 | else if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty()) | |||
| 4520 | Sequence.SetOverloadFailure( | |||
| 4521 | InitializationSequence::FK_ReferenceInitOverloadFailed, | |||
| 4522 | ConvOvlResult); | |||
| 4523 | else if (!InitCategory.isLValue()) | |||
| 4524 | Sequence.SetFailed( | |||
| 4525 | InitializationSequence::FK_NonConstLValueReferenceBindingToTemporary); | |||
| 4526 | else { | |||
| 4527 | InitializationSequence::FailureKind FK; | |||
| 4528 | switch (RefRelationship) { | |||
| 4529 | case Sema::Ref_Compatible: | |||
| 4530 | if (Initializer->refersToBitField()) | |||
| 4531 | FK = InitializationSequence:: | |||
| 4532 | FK_NonConstLValueReferenceBindingToBitfield; | |||
| 4533 | else if (Initializer->refersToVectorElement()) | |||
| 4534 | FK = InitializationSequence:: | |||
| 4535 | FK_NonConstLValueReferenceBindingToVectorElement; | |||
| 4536 | else | |||
| 4537 | llvm_unreachable("unexpected kind of compatible initializer")::llvm::llvm_unreachable_internal("unexpected kind of compatible initializer" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4537); | |||
| 4538 | break; | |||
| 4539 | case Sema::Ref_Related: | |||
| 4540 | FK = InitializationSequence::FK_ReferenceInitDropsQualifiers; | |||
| 4541 | break; | |||
| 4542 | case Sema::Ref_Incompatible: | |||
| 4543 | FK = InitializationSequence:: | |||
| 4544 | FK_NonConstLValueReferenceBindingToUnrelated; | |||
| 4545 | break; | |||
| 4546 | } | |||
| 4547 | Sequence.SetFailed(FK); | |||
| 4548 | } | |||
| 4549 | return; | |||
| 4550 | } | |||
| 4551 | ||||
| 4552 | // - If the initializer expression | |||
| 4553 | // - is an | |||
| 4554 | // [<=14] xvalue (but not a bit-field), class prvalue, array prvalue, or | |||
| 4555 | // [1z] rvalue (but not a bit-field) or | |||
| 4556 | // function lvalue and "cv1 T1" is reference-compatible with "cv2 T2" | |||
| 4557 | // | |||
| 4558 | // Note: functions are handled above and below rather than here... | |||
| 4559 | if (!T1Function && | |||
| 4560 | (RefRelationship == Sema::Ref_Compatible || | |||
| 4561 | (Kind.isCStyleOrFunctionalCast() && | |||
| 4562 | RefRelationship == Sema::Ref_Related)) && | |||
| 4563 | ((InitCategory.isXValue() && !isNonReferenceableGLValue(Initializer)) || | |||
| 4564 | (InitCategory.isPRValue() && | |||
| 4565 | (S.getLangOpts().CPlusPlus17 || T2->isRecordType() || | |||
| 4566 | T2->isArrayType())))) { | |||
| 4567 | ExprValueKind ValueKind = InitCategory.isXValue() ? VK_XValue : VK_RValue; | |||
| 4568 | if (InitCategory.isPRValue() && T2->isRecordType()) { | |||
| 4569 | // The corresponding bullet in C++03 [dcl.init.ref]p5 gives the | |||
| 4570 | // compiler the freedom to perform a copy here or bind to the | |||
| 4571 | // object, while C++0x requires that we bind directly to the | |||
| 4572 | // object. Hence, we always bind to the object without making an | |||
| 4573 | // extra copy. However, in C++03 requires that we check for the | |||
| 4574 | // presence of a suitable copy constructor: | |||
| 4575 | // | |||
| 4576 | // The constructor that would be used to make the copy shall | |||
| 4577 | // be callable whether or not the copy is actually done. | |||
| 4578 | if (!S.getLangOpts().CPlusPlus11 && !S.getLangOpts().MicrosoftExt) | |||
| 4579 | Sequence.AddExtraneousCopyToTemporary(cv2T2); | |||
| 4580 | else if (S.getLangOpts().CPlusPlus11) | |||
| 4581 | CheckCXX98CompatAccessibleCopy(S, Entity, Initializer); | |||
| 4582 | } | |||
| 4583 | ||||
| 4584 | // C++1z [dcl.init.ref]/5.2.1.2: | |||
| 4585 | // If the converted initializer is a prvalue, its type T4 is adjusted | |||
| 4586 | // to type "cv1 T4" and the temporary materialization conversion is | |||
| 4587 | // applied. | |||
| 4588 | QualType cv1T4 = S.Context.getQualifiedType(cv2T2, T1Quals); | |||
| 4589 | if (T1Quals != T2Quals) | |||
| 4590 | Sequence.AddQualificationConversionStep(cv1T4, ValueKind); | |||
| 4591 | Sequence.AddReferenceBindingStep(cv1T4, ValueKind == VK_RValue); | |||
| 4592 | ValueKind = isLValueRef ? VK_LValue : VK_XValue; | |||
| 4593 | ||||
| 4594 | // In any case, the reference is bound to the resulting glvalue (or to | |||
| 4595 | // an appropriate base class subobject). | |||
| 4596 | if (DerivedToBase) | |||
| 4597 | Sequence.AddDerivedToBaseCastStep(cv1T1, ValueKind); | |||
| 4598 | else if (ObjCConversion) | |||
| 4599 | Sequence.AddObjCObjectConversionStep(cv1T1); | |||
| 4600 | return; | |||
| 4601 | } | |||
| 4602 | ||||
| 4603 | // - has a class type (i.e., T2 is a class type), where T1 is not | |||
| 4604 | // reference-related to T2, and can be implicitly converted to an | |||
| 4605 | // xvalue, class prvalue, or function lvalue of type "cv3 T3", | |||
| 4606 | // where "cv1 T1" is reference-compatible with "cv3 T3", | |||
| 4607 | // | |||
| 4608 | // DR1287 removes the "implicitly" here. | |||
| 4609 | if (T2->isRecordType()) { | |||
| 4610 | if (RefRelationship == Sema::Ref_Incompatible) { | |||
| 4611 | ConvOvlResult = TryRefInitWithConversionFunction( | |||
| 4612 | S, Entity, Kind, Initializer, /*AllowRValues*/ true, | |||
| 4613 | /*IsLValueRef*/ isLValueRef, Sequence); | |||
| 4614 | if (ConvOvlResult) | |||
| 4615 | Sequence.SetOverloadFailure( | |||
| 4616 | InitializationSequence::FK_ReferenceInitOverloadFailed, | |||
| 4617 | ConvOvlResult); | |||
| 4618 | ||||
| 4619 | return; | |||
| 4620 | } | |||
| 4621 | ||||
| 4622 | if (RefRelationship == Sema::Ref_Compatible && | |||
| 4623 | isRValueRef && InitCategory.isLValue()) { | |||
| 4624 | Sequence.SetFailed( | |||
| 4625 | InitializationSequence::FK_RValueReferenceBindingToLValue); | |||
| 4626 | return; | |||
| 4627 | } | |||
| 4628 | ||||
| 4629 | Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers); | |||
| 4630 | return; | |||
| 4631 | } | |||
| 4632 | ||||
| 4633 | // - Otherwise, a temporary of type "cv1 T1" is created and initialized | |||
| 4634 | // from the initializer expression using the rules for a non-reference | |||
| 4635 | // copy-initialization (8.5). The reference is then bound to the | |||
| 4636 | // temporary. [...] | |||
| 4637 | ||||
| 4638 | InitializedEntity TempEntity = InitializedEntity::InitializeTemporary(cv1T1); | |||
| 4639 | ||||
| 4640 | // FIXME: Why do we use an implicit conversion here rather than trying | |||
| 4641 | // copy-initialization? | |||
| 4642 | ImplicitConversionSequence ICS | |||
| 4643 | = S.TryImplicitConversion(Initializer, TempEntity.getType(), | |||
| 4644 | /*SuppressUserConversions=*/false, | |||
| 4645 | /*AllowExplicit=*/false, | |||
| 4646 | /*FIXME:InOverloadResolution=*/false, | |||
| 4647 | /*CStyle=*/Kind.isCStyleOrFunctionalCast(), | |||
| 4648 | /*AllowObjCWritebackConversion=*/false); | |||
| 4649 | ||||
| 4650 | if (ICS.isBad()) { | |||
| 4651 | // FIXME: Use the conversion function set stored in ICS to turn | |||
| 4652 | // this into an overloading ambiguity diagnostic. However, we need | |||
| 4653 | // to keep that set as an OverloadCandidateSet rather than as some | |||
| 4654 | // other kind of set. | |||
| 4655 | if (ConvOvlResult && !Sequence.getFailedCandidateSet().empty()) | |||
| 4656 | Sequence.SetOverloadFailure( | |||
| 4657 | InitializationSequence::FK_ReferenceInitOverloadFailed, | |||
| 4658 | ConvOvlResult); | |||
| 4659 | else if (S.Context.getCanonicalType(T2) == S.Context.OverloadTy) | |||
| 4660 | Sequence.SetFailed(InitializationSequence::FK_AddressOfOverloadFailed); | |||
| 4661 | else | |||
| 4662 | Sequence.SetFailed(InitializationSequence::FK_ReferenceInitFailed); | |||
| 4663 | return; | |||
| 4664 | } else { | |||
| 4665 | Sequence.AddConversionSequenceStep(ICS, TempEntity.getType()); | |||
| 4666 | } | |||
| 4667 | ||||
| 4668 | // [...] If T1 is reference-related to T2, cv1 must be the | |||
| 4669 | // same cv-qualification as, or greater cv-qualification | |||
| 4670 | // than, cv2; otherwise, the program is ill-formed. | |||
| 4671 | unsigned T1CVRQuals = T1Quals.getCVRQualifiers(); | |||
| 4672 | unsigned T2CVRQuals = T2Quals.getCVRQualifiers(); | |||
| 4673 | if (RefRelationship == Sema::Ref_Related && | |||
| 4674 | (T1CVRQuals | T2CVRQuals) != T1CVRQuals) { | |||
| 4675 | Sequence.SetFailed(InitializationSequence::FK_ReferenceInitDropsQualifiers); | |||
| 4676 | return; | |||
| 4677 | } | |||
| 4678 | ||||
| 4679 | // [...] If T1 is reference-related to T2 and the reference is an rvalue | |||
| 4680 | // reference, the initializer expression shall not be an lvalue. | |||
| 4681 | if (RefRelationship >= Sema::Ref_Related && !isLValueRef && | |||
| 4682 | InitCategory.isLValue()) { | |||
| 4683 | Sequence.SetFailed( | |||
| 4684 | InitializationSequence::FK_RValueReferenceBindingToLValue); | |||
| 4685 | return; | |||
| 4686 | } | |||
| 4687 | ||||
| 4688 | Sequence.AddReferenceBindingStep(cv1T1, /*bindingTemporary=*/true); | |||
| 4689 | } | |||
| 4690 | ||||
| 4691 | /// Attempt character array initialization from a string literal | |||
| 4692 | /// (C++ [dcl.init.string], C99 6.7.8). | |||
| 4693 | static void TryStringLiteralInitialization(Sema &S, | |||
| 4694 | const InitializedEntity &Entity, | |||
| 4695 | const InitializationKind &Kind, | |||
| 4696 | Expr *Initializer, | |||
| 4697 | InitializationSequence &Sequence) { | |||
| 4698 | Sequence.AddStringInitStep(Entity.getType()); | |||
| 4699 | } | |||
| 4700 | ||||
| 4701 | /// Attempt value initialization (C++ [dcl.init]p7). | |||
| 4702 | static void TryValueInitialization(Sema &S, | |||
| 4703 | const InitializedEntity &Entity, | |||
| 4704 | const InitializationKind &Kind, | |||
| 4705 | InitializationSequence &Sequence, | |||
| 4706 | InitListExpr *InitList) { | |||
| 4707 | assert((!InitList || InitList->getNumInits() == 0) &&(static_cast <bool> ((!InitList || InitList->getNumInits () == 0) && "Shouldn't use value-init for non-empty init lists" ) ? void (0) : __assert_fail ("(!InitList || InitList->getNumInits() == 0) && \"Shouldn't use value-init for non-empty init lists\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4708, __extension__ __PRETTY_FUNCTION__)) | |||
| 4708 | "Shouldn't use value-init for non-empty init lists")(static_cast <bool> ((!InitList || InitList->getNumInits () == 0) && "Shouldn't use value-init for non-empty init lists" ) ? void (0) : __assert_fail ("(!InitList || InitList->getNumInits() == 0) && \"Shouldn't use value-init for non-empty init lists\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4708, __extension__ __PRETTY_FUNCTION__)); | |||
| 4709 | ||||
| 4710 | // C++98 [dcl.init]p5, C++11 [dcl.init]p7: | |||
| 4711 | // | |||
| 4712 | // To value-initialize an object of type T means: | |||
| 4713 | QualType T = Entity.getType(); | |||
| 4714 | ||||
| 4715 | // -- if T is an array type, then each element is value-initialized; | |||
| 4716 | T = S.Context.getBaseElementType(T); | |||
| 4717 | ||||
| 4718 | if (const RecordType *RT = T->getAs<RecordType>()) { | |||
| 4719 | if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) { | |||
| 4720 | bool NeedZeroInitialization = true; | |||
| 4721 | // C++98: | |||
| 4722 | // -- if T is a class type (clause 9) with a user-declared constructor | |||
| 4723 | // (12.1), then the default constructor for T is called (and the | |||
| 4724 | // initialization is ill-formed if T has no accessible default | |||
| 4725 | // constructor); | |||
| 4726 | // C++11: | |||
| 4727 | // -- if T is a class type (clause 9) with either no default constructor | |||
| 4728 | // (12.1 [class.ctor]) or a default constructor that is user-provided | |||
| 4729 | // or deleted, then the object is default-initialized; | |||
| 4730 | // | |||
| 4731 | // Note that the C++11 rule is the same as the C++98 rule if there are no | |||
| 4732 | // defaulted or deleted constructors, so we just use it unconditionally. | |||
| 4733 | CXXConstructorDecl *CD = S.LookupDefaultConstructor(ClassDecl); | |||
| 4734 | if (!CD || !CD->getCanonicalDecl()->isDefaulted() || CD->isDeleted()) | |||
| 4735 | NeedZeroInitialization = false; | |||
| 4736 | ||||
| 4737 | // -- if T is a (possibly cv-qualified) non-union class type without a | |||
| 4738 | // user-provided or deleted default constructor, then the object is | |||
| 4739 | // zero-initialized and, if T has a non-trivial default constructor, | |||
| 4740 | // default-initialized; | |||
| 4741 | // The 'non-union' here was removed by DR1502. The 'non-trivial default | |||
| 4742 | // constructor' part was removed by DR1507. | |||
| 4743 | if (NeedZeroInitialization) | |||
| 4744 | Sequence.AddZeroInitializationStep(Entity.getType()); | |||
| 4745 | ||||
| 4746 | // C++03: | |||
| 4747 | // -- if T is a non-union class type without a user-declared constructor, | |||
| 4748 | // then every non-static data member and base class component of T is | |||
| 4749 | // value-initialized; | |||
| 4750 | // [...] A program that calls for [...] value-initialization of an | |||
| 4751 | // entity of reference type is ill-formed. | |||
| 4752 | // | |||
| 4753 | // C++11 doesn't need this handling, because value-initialization does not | |||
| 4754 | // occur recursively there, and the implicit default constructor is | |||
| 4755 | // defined as deleted in the problematic cases. | |||
| 4756 | if (!S.getLangOpts().CPlusPlus11 && | |||
| 4757 | ClassDecl->hasUninitializedReferenceMember()) { | |||
| 4758 | Sequence.SetFailed(InitializationSequence::FK_TooManyInitsForReference); | |||
| 4759 | return; | |||
| 4760 | } | |||
| 4761 | ||||
| 4762 | // If this is list-value-initialization, pass the empty init list on when | |||
| 4763 | // building the constructor call. This affects the semantics of a few | |||
| 4764 | // things (such as whether an explicit default constructor can be called). | |||
| 4765 | Expr *InitListAsExpr = InitList; | |||
| 4766 | MultiExprArg Args(&InitListAsExpr, InitList ? 1 : 0); | |||
| 4767 | bool InitListSyntax = InitList; | |||
| 4768 | ||||
| 4769 | // FIXME: Instead of creating a CXXConstructExpr of array type here, | |||
| 4770 | // wrap a class-typed CXXConstructExpr in an ArrayInitLoopExpr. | |||
| 4771 | return TryConstructorInitialization( | |||
| 4772 | S, Entity, Kind, Args, T, Entity.getType(), Sequence, InitListSyntax); | |||
| 4773 | } | |||
| 4774 | } | |||
| 4775 | ||||
| 4776 | Sequence.AddZeroInitializationStep(Entity.getType()); | |||
| 4777 | } | |||
| 4778 | ||||
| 4779 | /// Attempt default initialization (C++ [dcl.init]p6). | |||
| 4780 | static void TryDefaultInitialization(Sema &S, | |||
| 4781 | const InitializedEntity &Entity, | |||
| 4782 | const InitializationKind &Kind, | |||
| 4783 | InitializationSequence &Sequence) { | |||
| 4784 | assert(Kind.getKind() == InitializationKind::IK_Default)(static_cast <bool> (Kind.getKind() == InitializationKind ::IK_Default) ? void (0) : __assert_fail ("Kind.getKind() == InitializationKind::IK_Default" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4784, __extension__ __PRETTY_FUNCTION__)); | |||
| 4785 | ||||
| 4786 | // C++ [dcl.init]p6: | |||
| 4787 | // To default-initialize an object of type T means: | |||
| 4788 | // - if T is an array type, each element is default-initialized; | |||
| 4789 | QualType DestType = S.Context.getBaseElementType(Entity.getType()); | |||
| 4790 | ||||
| 4791 | // - if T is a (possibly cv-qualified) class type (Clause 9), the default | |||
| 4792 | // constructor for T is called (and the initialization is ill-formed if | |||
| 4793 | // T has no accessible default constructor); | |||
| 4794 | if (DestType->isRecordType() && S.getLangOpts().CPlusPlus) { | |||
| 4795 | TryConstructorInitialization(S, Entity, Kind, None, DestType, | |||
| 4796 | Entity.getType(), Sequence); | |||
| 4797 | return; | |||
| 4798 | } | |||
| 4799 | ||||
| 4800 | // - otherwise, no initialization is performed. | |||
| 4801 | ||||
| 4802 | // If a program calls for the default initialization of an object of | |||
| 4803 | // a const-qualified type T, T shall be a class type with a user-provided | |||
| 4804 | // default constructor. | |||
| 4805 | if (DestType.isConstQualified() && S.getLangOpts().CPlusPlus) { | |||
| 4806 | if (!maybeRecoverWithZeroInitialization(S, Sequence, Entity)) | |||
| 4807 | Sequence.SetFailed(InitializationSequence::FK_DefaultInitOfConst); | |||
| 4808 | return; | |||
| 4809 | } | |||
| 4810 | ||||
| 4811 | // If the destination type has a lifetime property, zero-initialize it. | |||
| 4812 | if (DestType.getQualifiers().hasObjCLifetime()) { | |||
| 4813 | Sequence.AddZeroInitializationStep(Entity.getType()); | |||
| 4814 | return; | |||
| 4815 | } | |||
| 4816 | } | |||
| 4817 | ||||
| 4818 | /// Attempt a user-defined conversion between two types (C++ [dcl.init]), | |||
| 4819 | /// which enumerates all conversion functions and performs overload resolution | |||
| 4820 | /// to select the best. | |||
| 4821 | static void TryUserDefinedConversion(Sema &S, | |||
| 4822 | QualType DestType, | |||
| 4823 | const InitializationKind &Kind, | |||
| 4824 | Expr *Initializer, | |||
| 4825 | InitializationSequence &Sequence, | |||
| 4826 | bool TopLevelOfInitList) { | |||
| 4827 | assert(!DestType->isReferenceType() && "References are handled elsewhere")(static_cast <bool> (!DestType->isReferenceType() && "References are handled elsewhere") ? void (0) : __assert_fail ("!DestType->isReferenceType() && \"References are handled elsewhere\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4827, __extension__ __PRETTY_FUNCTION__)); | |||
| 4828 | QualType SourceType = Initializer->getType(); | |||
| 4829 | assert((DestType->isRecordType() || SourceType->isRecordType()) &&(static_cast <bool> ((DestType->isRecordType() || SourceType ->isRecordType()) && "Must have a class type to perform a user-defined conversion" ) ? void (0) : __assert_fail ("(DestType->isRecordType() || SourceType->isRecordType()) && \"Must have a class type to perform a user-defined conversion\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4830, __extension__ __PRETTY_FUNCTION__)) | |||
| 4830 | "Must have a class type to perform a user-defined conversion")(static_cast <bool> ((DestType->isRecordType() || SourceType ->isRecordType()) && "Must have a class type to perform a user-defined conversion" ) ? void (0) : __assert_fail ("(DestType->isRecordType() || SourceType->isRecordType()) && \"Must have a class type to perform a user-defined conversion\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 4830, __extension__ __PRETTY_FUNCTION__)); | |||
| 4831 | ||||
| 4832 | // Build the candidate set directly in the initialization sequence | |||
| 4833 | // structure, so that it will persist if we fail. | |||
| 4834 | OverloadCandidateSet &CandidateSet = Sequence.getFailedCandidateSet(); | |||
| 4835 | CandidateSet.clear(OverloadCandidateSet::CSK_InitByUserDefinedConversion); | |||
| 4836 | ||||
| 4837 | // Determine whether we are allowed to call explicit constructors or | |||
| 4838 | // explicit conversion operators. | |||
| 4839 | bool AllowExplicit = Kind.AllowExplicit(); | |||
| 4840 | ||||
| 4841 | if (const RecordType *DestRecordType = DestType->getAs<RecordType>()) { | |||
| 4842 | // The type we're converting to is a class type. Enumerate its constructors | |||
| 4843 | // to see if there is a suitable conversion. | |||
| 4844 | CXXRecordDecl *DestRecordDecl | |||
| 4845 | = cast<CXXRecordDecl>(DestRecordType->getDecl()); | |||
| 4846 | ||||
| 4847 | // Try to complete the type we're converting to. | |||
| 4848 | if (S.isCompleteType(Kind.getLocation(), DestType)) { | |||
| 4849 | for (NamedDecl *D : S.LookupConstructors(DestRecordDecl)) { | |||
| 4850 | auto Info = getConstructorInfo(D); | |||
| 4851 | if (!Info.Constructor) | |||
| 4852 | continue; | |||
| 4853 | ||||
| 4854 | if (!Info.Constructor->isInvalidDecl() && | |||
| 4855 | Info.Constructor->isConvertingConstructor(AllowExplicit)) { | |||
| 4856 | if (Info.ConstructorTmpl) | |||
| 4857 | S.AddTemplateOverloadCandidate(Info.ConstructorTmpl, Info.FoundDecl, | |||
| 4858 | /*ExplicitArgs*/ nullptr, | |||
| 4859 | Initializer, CandidateSet, | |||
| 4860 | /*SuppressUserConversions=*/true); | |||
| 4861 | else | |||
| 4862 | S.AddOverloadCandidate(Info.Constructor, Info.FoundDecl, | |||
| 4863 | Initializer, CandidateSet, | |||
| 4864 | /*SuppressUserConversions=*/true); | |||
| 4865 | } | |||
| 4866 | } | |||
| 4867 | } | |||
| 4868 | } | |||
| 4869 | ||||
| 4870 | SourceLocation DeclLoc = Initializer->getLocStart(); | |||
| 4871 | ||||
| 4872 | if (const RecordType *SourceRecordType = SourceType->getAs<RecordType>()) { | |||
| 4873 | // The type we're converting from is a class type, enumerate its conversion | |||
| 4874 | // functions. | |||
| 4875 | ||||
| 4876 | // We can only enumerate the conversion functions for a complete type; if | |||
| 4877 | // the type isn't complete, simply skip this step. | |||
| 4878 | if (S.isCompleteType(DeclLoc, SourceType)) { | |||
| 4879 | CXXRecordDecl *SourceRecordDecl | |||
| 4880 | = cast<CXXRecordDecl>(SourceRecordType->getDecl()); | |||
| 4881 | ||||
| 4882 | const auto &Conversions = | |||
| 4883 | SourceRecordDecl->getVisibleConversionFunctions(); | |||
| 4884 | for (auto I = Conversions.begin(), E = Conversions.end(); I != E; ++I) { | |||
| 4885 | NamedDecl *D = *I; | |||
| 4886 | CXXRecordDecl *ActingDC = cast<CXXRecordDecl>(D->getDeclContext()); | |||
| 4887 | if (isa<UsingShadowDecl>(D)) | |||
| 4888 | D = cast<UsingShadowDecl>(D)->getTargetDecl(); | |||
| 4889 | ||||
| 4890 | FunctionTemplateDecl *ConvTemplate = dyn_cast<FunctionTemplateDecl>(D); | |||
| 4891 | CXXConversionDecl *Conv; | |||
| 4892 | if (ConvTemplate) | |||
| 4893 | Conv = cast<CXXConversionDecl>(ConvTemplate->getTemplatedDecl()); | |||
| 4894 | else | |||
| 4895 | Conv = cast<CXXConversionDecl>(D); | |||
| 4896 | ||||
| 4897 | if (AllowExplicit || !Conv->isExplicit()) { | |||
| 4898 | if (ConvTemplate) | |||
| 4899 | S.AddTemplateConversionCandidate(ConvTemplate, I.getPair(), | |||
| 4900 | ActingDC, Initializer, DestType, | |||
| 4901 | CandidateSet, AllowExplicit); | |||
| 4902 | else | |||
| 4903 | S.AddConversionCandidate(Conv, I.getPair(), ActingDC, | |||
| 4904 | Initializer, DestType, CandidateSet, | |||
| 4905 | AllowExplicit); | |||
| 4906 | } | |||
| 4907 | } | |||
| 4908 | } | |||
| 4909 | } | |||
| 4910 | ||||
| 4911 | // Perform overload resolution. If it fails, return the failed result. | |||
| 4912 | OverloadCandidateSet::iterator Best; | |||
| 4913 | if (OverloadingResult Result | |||
| 4914 | = CandidateSet.BestViableFunction(S, DeclLoc, Best)) { | |||
| 4915 | Sequence.SetOverloadFailure( | |||
| 4916 | InitializationSequence::FK_UserConversionOverloadFailed, | |||
| 4917 | Result); | |||
| 4918 | return; | |||
| 4919 | } | |||
| 4920 | ||||
| 4921 | FunctionDecl *Function = Best->Function; | |||
| 4922 | Function->setReferenced(); | |||
| 4923 | bool HadMultipleCandidates = (CandidateSet.size() > 1); | |||
| 4924 | ||||
| 4925 | if (isa<CXXConstructorDecl>(Function)) { | |||
| 4926 | // Add the user-defined conversion step. Any cv-qualification conversion is | |||
| 4927 | // subsumed by the initialization. Per DR5, the created temporary is of the | |||
| 4928 | // cv-unqualified type of the destination. | |||
| 4929 | Sequence.AddUserConversionStep(Function, Best->FoundDecl, | |||
| 4930 | DestType.getUnqualifiedType(), | |||
| 4931 | HadMultipleCandidates); | |||
| 4932 | ||||
| 4933 | // C++14 and before: | |||
| 4934 | // - if the function is a constructor, the call initializes a temporary | |||
| 4935 | // of the cv-unqualified version of the destination type. The [...] | |||
| 4936 | // temporary [...] is then used to direct-initialize, according to the | |||
| 4937 | // rules above, the object that is the destination of the | |||
| 4938 | // copy-initialization. | |||
| 4939 | // Note that this just performs a simple object copy from the temporary. | |||
| 4940 | // | |||
| 4941 | // C++17: | |||
| 4942 | // - if the function is a constructor, the call is a prvalue of the | |||
| 4943 | // cv-unqualified version of the destination type whose return object | |||
| 4944 | // is initialized by the constructor. The call is used to | |||
| 4945 | // direct-initialize, according to the rules above, the object that | |||
| 4946 | // is the destination of the copy-initialization. | |||
| 4947 | // Therefore we need to do nothing further. | |||
| 4948 | // | |||
| 4949 | // FIXME: Mark this copy as extraneous. | |||
| 4950 | if (!S.getLangOpts().CPlusPlus17) | |||
| 4951 | Sequence.AddFinalCopy(DestType); | |||
| 4952 | else if (DestType.hasQualifiers()) | |||
| 4953 | Sequence.AddQualificationConversionStep(DestType, VK_RValue); | |||
| 4954 | return; | |||
| 4955 | } | |||
| 4956 | ||||
| 4957 | // Add the user-defined conversion step that calls the conversion function. | |||
| 4958 | QualType ConvType = Function->getCallResultType(); | |||
| 4959 | Sequence.AddUserConversionStep(Function, Best->FoundDecl, ConvType, | |||
| 4960 | HadMultipleCandidates); | |||
| 4961 | ||||
| 4962 | if (ConvType->getAs<RecordType>()) { | |||
| 4963 | // The call is used to direct-initialize [...] the object that is the | |||
| 4964 | // destination of the copy-initialization. | |||
| 4965 | // | |||
| 4966 | // In C++17, this does not call a constructor if we enter /17.6.1: | |||
| 4967 | // - If the initializer expression is a prvalue and the cv-unqualified | |||
| 4968 | // version of the source type is the same as the class of the | |||
| 4969 | // destination [... do not make an extra copy] | |||
| 4970 | // | |||
| 4971 | // FIXME: Mark this copy as extraneous. | |||
| 4972 | if (!S.getLangOpts().CPlusPlus17 || | |||
| 4973 | Function->getReturnType()->isReferenceType() || | |||
| 4974 | !S.Context.hasSameUnqualifiedType(ConvType, DestType)) | |||
| 4975 | Sequence.AddFinalCopy(DestType); | |||
| 4976 | else if (!S.Context.hasSameType(ConvType, DestType)) | |||
| 4977 | Sequence.AddQualificationConversionStep(DestType, VK_RValue); | |||
| 4978 | return; | |||
| 4979 | } | |||
| 4980 | ||||
| 4981 | // If the conversion following the call to the conversion function | |||
| 4982 | // is interesting, add it as a separate step. | |||
| 4983 | if (Best->FinalConversion.First || Best->FinalConversion.Second || | |||
| 4984 | Best->FinalConversion.Third) { | |||
| 4985 | ImplicitConversionSequence ICS; | |||
| 4986 | ICS.setStandard(); | |||
| 4987 | ICS.Standard = Best->FinalConversion; | |||
| 4988 | Sequence.AddConversionSequenceStep(ICS, DestType, TopLevelOfInitList); | |||
| 4989 | } | |||
| 4990 | } | |||
| 4991 | ||||
| 4992 | /// An egregious hack for compatibility with libstdc++-4.2: in <tr1/hashtable>, | |||
| 4993 | /// a function with a pointer return type contains a 'return false;' statement. | |||
| 4994 | /// In C++11, 'false' is not a null pointer, so this breaks the build of any | |||
| 4995 | /// code using that header. | |||
| 4996 | /// | |||
| 4997 | /// Work around this by treating 'return false;' as zero-initializing the result | |||
| 4998 | /// if it's used in a pointer-returning function in a system header. | |||
| 4999 | static bool isLibstdcxxPointerReturnFalseHack(Sema &S, | |||
| 5000 | const InitializedEntity &Entity, | |||
| 5001 | const Expr *Init) { | |||
| 5002 | return S.getLangOpts().CPlusPlus11 && | |||
| 5003 | Entity.getKind() == InitializedEntity::EK_Result && | |||
| 5004 | Entity.getType()->isPointerType() && | |||
| 5005 | isa<CXXBoolLiteralExpr>(Init) && | |||
| 5006 | !cast<CXXBoolLiteralExpr>(Init)->getValue() && | |||
| 5007 | S.getSourceManager().isInSystemHeader(Init->getExprLoc()); | |||
| 5008 | } | |||
| 5009 | ||||
| 5010 | /// The non-zero enum values here are indexes into diagnostic alternatives. | |||
| 5011 | enum InvalidICRKind { IIK_okay, IIK_nonlocal, IIK_nonscalar }; | |||
| 5012 | ||||
| 5013 | /// Determines whether this expression is an acceptable ICR source. | |||
| 5014 | static InvalidICRKind isInvalidICRSource(ASTContext &C, Expr *e, | |||
| 5015 | bool isAddressOf, bool &isWeakAccess) { | |||
| 5016 | // Skip parens. | |||
| 5017 | e = e->IgnoreParens(); | |||
| 5018 | ||||
| 5019 | // Skip address-of nodes. | |||
| 5020 | if (UnaryOperator *op = dyn_cast<UnaryOperator>(e)) { | |||
| 5021 | if (op->getOpcode() == UO_AddrOf) | |||
| 5022 | return isInvalidICRSource(C, op->getSubExpr(), /*addressof*/ true, | |||
| 5023 | isWeakAccess); | |||
| 5024 | ||||
| 5025 | // Skip certain casts. | |||
| 5026 | } else if (CastExpr *ce = dyn_cast<CastExpr>(e)) { | |||
| 5027 | switch (ce->getCastKind()) { | |||
| 5028 | case CK_Dependent: | |||
| 5029 | case CK_BitCast: | |||
| 5030 | case CK_LValueBitCast: | |||
| 5031 | case CK_NoOp: | |||
| 5032 | return isInvalidICRSource(C, ce->getSubExpr(), isAddressOf, isWeakAccess); | |||
| 5033 | ||||
| 5034 | case CK_ArrayToPointerDecay: | |||
| 5035 | return IIK_nonscalar; | |||
| 5036 | ||||
| 5037 | case CK_NullToPointer: | |||
| 5038 | return IIK_okay; | |||
| 5039 | ||||
| 5040 | default: | |||
| 5041 | break; | |||
| 5042 | } | |||
| 5043 | ||||
| 5044 | // If we have a declaration reference, it had better be a local variable. | |||
| 5045 | } else if (isa<DeclRefExpr>(e)) { | |||
| 5046 | // set isWeakAccess to true, to mean that there will be an implicit | |||
| 5047 | // load which requires a cleanup. | |||
| 5048 | if (e->getType().getObjCLifetime() == Qualifiers::OCL_Weak) | |||
| 5049 | isWeakAccess = true; | |||
| 5050 | ||||
| 5051 | if (!isAddressOf) return IIK_nonlocal; | |||
| 5052 | ||||
| 5053 | VarDecl *var = dyn_cast<VarDecl>(cast<DeclRefExpr>(e)->getDecl()); | |||
| 5054 | if (!var) return IIK_nonlocal; | |||
| 5055 | ||||
| 5056 | return (var->hasLocalStorage() ? IIK_okay : IIK_nonlocal); | |||
| 5057 | ||||
| 5058 | // If we have a conditional operator, check both sides. | |||
| 5059 | } else if (ConditionalOperator *cond = dyn_cast<ConditionalOperator>(e)) { | |||
| 5060 | if (InvalidICRKind iik = isInvalidICRSource(C, cond->getLHS(), isAddressOf, | |||
| 5061 | isWeakAccess)) | |||
| 5062 | return iik; | |||
| 5063 | ||||
| 5064 | return isInvalidICRSource(C, cond->getRHS(), isAddressOf, isWeakAccess); | |||
| 5065 | ||||
| 5066 | // These are never scalar. | |||
| 5067 | } else if (isa<ArraySubscriptExpr>(e)) { | |||
| 5068 | return IIK_nonscalar; | |||
| 5069 | ||||
| 5070 | // Otherwise, it needs to be a null pointer constant. | |||
| 5071 | } else { | |||
| 5072 | return (e->isNullPointerConstant(C, Expr::NPC_ValueDependentIsNull) | |||
| 5073 | ? IIK_okay : IIK_nonlocal); | |||
| 5074 | } | |||
| 5075 | ||||
| 5076 | return IIK_nonlocal; | |||
| 5077 | } | |||
| 5078 | ||||
| 5079 | /// Check whether the given expression is a valid operand for an | |||
| 5080 | /// indirect copy/restore. | |||
| 5081 | static void checkIndirectCopyRestoreSource(Sema &S, Expr *src) { | |||
| 5082 | assert(src->isRValue())(static_cast <bool> (src->isRValue()) ? void (0) : __assert_fail ("src->isRValue()", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 5082, __extension__ __PRETTY_FUNCTION__)); | |||
| 5083 | bool isWeakAccess = false; | |||
| 5084 | InvalidICRKind iik = isInvalidICRSource(S.Context, src, false, isWeakAccess); | |||
| 5085 | // If isWeakAccess to true, there will be an implicit | |||
| 5086 | // load which requires a cleanup. | |||
| 5087 | if (S.getLangOpts().ObjCAutoRefCount && isWeakAccess) | |||
| 5088 | S.Cleanup.setExprNeedsCleanups(true); | |||
| 5089 | ||||
| 5090 | if (iik == IIK_okay) return; | |||
| 5091 | ||||
| 5092 | S.Diag(src->getExprLoc(), diag::err_arc_nonlocal_writeback) | |||
| 5093 | << ((unsigned) iik - 1) // shift index into diagnostic explanations | |||
| 5094 | << src->getSourceRange(); | |||
| 5095 | } | |||
| 5096 | ||||
| 5097 | /// Determine whether we have compatible array types for the | |||
| 5098 | /// purposes of GNU by-copy array initialization. | |||
| 5099 | static bool hasCompatibleArrayTypes(ASTContext &Context, const ArrayType *Dest, | |||
| 5100 | const ArrayType *Source) { | |||
| 5101 | // If the source and destination array types are equivalent, we're | |||
| 5102 | // done. | |||
| 5103 | if (Context.hasSameType(QualType(Dest, 0), QualType(Source, 0))) | |||
| 5104 | return true; | |||
| 5105 | ||||
| 5106 | // Make sure that the element types are the same. | |||
| 5107 | if (!Context.hasSameType(Dest->getElementType(), Source->getElementType())) | |||
| 5108 | return false; | |||
| 5109 | ||||
| 5110 | // The only mismatch we allow is when the destination is an | |||
| 5111 | // incomplete array type and the source is a constant array type. | |||
| 5112 | return Source->isConstantArrayType() && Dest->isIncompleteArrayType(); | |||
| 5113 | } | |||
| 5114 | ||||
| 5115 | static bool tryObjCWritebackConversion(Sema &S, | |||
| 5116 | InitializationSequence &Sequence, | |||
| 5117 | const InitializedEntity &Entity, | |||
| 5118 | Expr *Initializer) { | |||
| 5119 | bool ArrayDecay = false; | |||
| 5120 | QualType ArgType = Initializer->getType(); | |||
| 5121 | QualType ArgPointee; | |||
| 5122 | if (const ArrayType *ArgArrayType = S.Context.getAsArrayType(ArgType)) { | |||
| 5123 | ArrayDecay = true; | |||
| 5124 | ArgPointee = ArgArrayType->getElementType(); | |||
| 5125 | ArgType = S.Context.getPointerType(ArgPointee); | |||
| 5126 | } | |||
| 5127 | ||||
| 5128 | // Handle write-back conversion. | |||
| 5129 | QualType ConvertedArgType; | |||
| 5130 | if (!S.isObjCWritebackConversion(ArgType, Entity.getType(), | |||
| 5131 | ConvertedArgType)) | |||
| 5132 | return false; | |||
| 5133 | ||||
| 5134 | // We should copy unless we're passing to an argument explicitly | |||
| 5135 | // marked 'out'. | |||
| 5136 | bool ShouldCopy = true; | |||
| 5137 | if (ParmVarDecl *param = cast_or_null<ParmVarDecl>(Entity.getDecl())) | |||
| 5138 | ShouldCopy = (param->getObjCDeclQualifier() != ParmVarDecl::OBJC_TQ_Out); | |||
| 5139 | ||||
| 5140 | // Do we need an lvalue conversion? | |||
| 5141 | if (ArrayDecay || Initializer->isGLValue()) { | |||
| 5142 | ImplicitConversionSequence ICS; | |||
| 5143 | ICS.setStandard(); | |||
| 5144 | ICS.Standard.setAsIdentityConversion(); | |||
| 5145 | ||||
| 5146 | QualType ResultType; | |||
| 5147 | if (ArrayDecay) { | |||
| 5148 | ICS.Standard.First = ICK_Array_To_Pointer; | |||
| 5149 | ResultType = S.Context.getPointerType(ArgPointee); | |||
| 5150 | } else { | |||
| 5151 | ICS.Standard.First = ICK_Lvalue_To_Rvalue; | |||
| 5152 | ResultType = Initializer->getType().getNonLValueExprType(S.Context); | |||
| 5153 | } | |||
| 5154 | ||||
| 5155 | Sequence.AddConversionSequenceStep(ICS, ResultType); | |||
| 5156 | } | |||
| 5157 | ||||
| 5158 | Sequence.AddPassByIndirectCopyRestoreStep(Entity.getType(), ShouldCopy); | |||
| 5159 | return true; | |||
| 5160 | } | |||
| 5161 | ||||
| 5162 | static bool TryOCLSamplerInitialization(Sema &S, | |||
| 5163 | InitializationSequence &Sequence, | |||
| 5164 | QualType DestType, | |||
| 5165 | Expr *Initializer) { | |||
| 5166 | if (!S.getLangOpts().OpenCL || !DestType->isSamplerT() || | |||
| 5167 | (!Initializer->isIntegerConstantExpr(S.Context) && | |||
| ||||
| 5168 | !Initializer->getType()->isSamplerT())) | |||
| 5169 | return false; | |||
| 5170 | ||||
| 5171 | Sequence.AddOCLSamplerInitStep(DestType); | |||
| 5172 | return true; | |||
| 5173 | } | |||
| 5174 | ||||
| 5175 | // | |||
| 5176 | // OpenCL 1.2 spec, s6.12.10 | |||
| 5177 | // | |||
| 5178 | // The event argument can also be used to associate the | |||
| 5179 | // async_work_group_copy with a previous async copy allowing | |||
| 5180 | // an event to be shared by multiple async copies; otherwise | |||
| 5181 | // event should be zero. | |||
| 5182 | // | |||
| 5183 | static bool TryOCLZeroEventInitialization(Sema &S, | |||
| 5184 | InitializationSequence &Sequence, | |||
| 5185 | QualType DestType, | |||
| 5186 | Expr *Initializer) { | |||
| 5187 | if (!S.getLangOpts().OpenCL || !DestType->isEventT() || | |||
| 5188 | !Initializer->isIntegerConstantExpr(S.getASTContext()) || | |||
| 5189 | (Initializer->EvaluateKnownConstInt(S.getASTContext()) != 0)) | |||
| 5190 | return false; | |||
| 5191 | ||||
| 5192 | Sequence.AddOCLZeroEventStep(DestType); | |||
| 5193 | return true; | |||
| 5194 | } | |||
| 5195 | ||||
| 5196 | static bool TryOCLZeroQueueInitialization(Sema &S, | |||
| 5197 | InitializationSequence &Sequence, | |||
| 5198 | QualType DestType, | |||
| 5199 | Expr *Initializer) { | |||
| 5200 | if (!S.getLangOpts().OpenCL || S.getLangOpts().OpenCLVersion < 200 || | |||
| 5201 | !DestType->isQueueT() || | |||
| 5202 | !Initializer->isIntegerConstantExpr(S.getASTContext()) || | |||
| 5203 | (Initializer->EvaluateKnownConstInt(S.getASTContext()) != 0)) | |||
| 5204 | return false; | |||
| 5205 | ||||
| 5206 | Sequence.AddOCLZeroQueueStep(DestType); | |||
| 5207 | return true; | |||
| 5208 | } | |||
| 5209 | ||||
| 5210 | InitializationSequence::InitializationSequence(Sema &S, | |||
| 5211 | const InitializedEntity &Entity, | |||
| 5212 | const InitializationKind &Kind, | |||
| 5213 | MultiExprArg Args, | |||
| 5214 | bool TopLevelOfInitList, | |||
| 5215 | bool TreatUnavailableAsInvalid) | |||
| 5216 | : FailedCandidateSet(Kind.getLocation(), OverloadCandidateSet::CSK_Normal) { | |||
| 5217 | InitializeFrom(S, Entity, Kind, Args, TopLevelOfInitList, | |||
| 5218 | TreatUnavailableAsInvalid); | |||
| 5219 | } | |||
| 5220 | ||||
| 5221 | /// Tries to get a FunctionDecl out of `E`. If it succeeds and we can take the | |||
| 5222 | /// address of that function, this returns true. Otherwise, it returns false. | |||
| 5223 | static bool isExprAnUnaddressableFunction(Sema &S, const Expr *E) { | |||
| 5224 | auto *DRE = dyn_cast<DeclRefExpr>(E); | |||
| 5225 | if (!DRE || !isa<FunctionDecl>(DRE->getDecl())) | |||
| 5226 | return false; | |||
| 5227 | ||||
| 5228 | return !S.checkAddressOfFunctionIsAvailable( | |||
| 5229 | cast<FunctionDecl>(DRE->getDecl())); | |||
| 5230 | } | |||
| 5231 | ||||
| 5232 | /// Determine whether we can perform an elementwise array copy for this kind | |||
| 5233 | /// of entity. | |||
| 5234 | static bool canPerformArrayCopy(const InitializedEntity &Entity) { | |||
| 5235 | switch (Entity.getKind()) { | |||
| 5236 | case InitializedEntity::EK_LambdaCapture: | |||
| 5237 | // C++ [expr.prim.lambda]p24: | |||
| 5238 | // For array members, the array elements are direct-initialized in | |||
| 5239 | // increasing subscript order. | |||
| 5240 | return true; | |||
| 5241 | ||||
| 5242 | case InitializedEntity::EK_Variable: | |||
| 5243 | // C++ [dcl.decomp]p1: | |||
| 5244 | // [...] each element is copy-initialized or direct-initialized from the | |||
| 5245 | // corresponding element of the assignment-expression [...] | |||
| 5246 | return isa<DecompositionDecl>(Entity.getDecl()); | |||
| 5247 | ||||
| 5248 | case InitializedEntity::EK_Member: | |||
| 5249 | // C++ [class.copy.ctor]p14: | |||
| 5250 | // - if the member is an array, each element is direct-initialized with | |||
| 5251 | // the corresponding subobject of x | |||
| 5252 | return Entity.isImplicitMemberInitializer(); | |||
| 5253 | ||||
| 5254 | case InitializedEntity::EK_ArrayElement: | |||
| 5255 | // All the above cases are intended to apply recursively, even though none | |||
| 5256 | // of them actually say that. | |||
| 5257 | if (auto *E = Entity.getParent()) | |||
| 5258 | return canPerformArrayCopy(*E); | |||
| 5259 | break; | |||
| 5260 | ||||
| 5261 | default: | |||
| 5262 | break; | |||
| 5263 | } | |||
| 5264 | ||||
| 5265 | return false; | |||
| 5266 | } | |||
| 5267 | ||||
| 5268 | void InitializationSequence::InitializeFrom(Sema &S, | |||
| 5269 | const InitializedEntity &Entity, | |||
| 5270 | const InitializationKind &Kind, | |||
| 5271 | MultiExprArg Args, | |||
| 5272 | bool TopLevelOfInitList, | |||
| 5273 | bool TreatUnavailableAsInvalid) { | |||
| 5274 | ASTContext &Context = S.Context; | |||
| 5275 | ||||
| 5276 | // Eliminate non-overload placeholder types in the arguments. We | |||
| 5277 | // need to do this before checking whether types are dependent | |||
| 5278 | // because lowering a pseudo-object expression might well give us | |||
| 5279 | // something of dependent type. | |||
| 5280 | for (unsigned I = 0, E = Args.size(); I != E; ++I) | |||
| ||||
| 5281 | if (Args[I]->getType()->isNonOverloadPlaceholderType()) { | |||
| 5282 | // FIXME: should we be doing this here? | |||
| 5283 | ExprResult result = S.CheckPlaceholderExpr(Args[I]); | |||
| 5284 | if (result.isInvalid()) { | |||
| 5285 | SetFailed(FK_PlaceholderType); | |||
| 5286 | return; | |||
| 5287 | } | |||
| 5288 | Args[I] = result.get(); | |||
| 5289 | } | |||
| 5290 | ||||
| 5291 | // C++0x [dcl.init]p16: | |||
| 5292 | // The semantics of initializers are as follows. The destination type is | |||
| 5293 | // the type of the object or reference being initialized and the source | |||
| 5294 | // type is the type of the initializer expression. The source type is not | |||
| 5295 | // defined when the initializer is a braced-init-list or when it is a | |||
| 5296 | // parenthesized list of expressions. | |||
| 5297 | QualType DestType = Entity.getType(); | |||
| 5298 | ||||
| 5299 | if (DestType->isDependentType() || | |||
| 5300 | Expr::hasAnyTypeDependentArguments(Args)) { | |||
| 5301 | SequenceKind = DependentSequence; | |||
| 5302 | return; | |||
| 5303 | } | |||
| 5304 | ||||
| 5305 | // Almost everything is a normal sequence. | |||
| 5306 | setSequenceKind(NormalSequence); | |||
| 5307 | ||||
| 5308 | QualType SourceType; | |||
| 5309 | Expr *Initializer = nullptr; | |||
| 5310 | if (Args.size() == 1) { | |||
| 5311 | Initializer = Args[0]; | |||
| 5312 | if (S.getLangOpts().ObjC1) { | |||
| 5313 | if (S.CheckObjCBridgeRelatedConversions(Initializer->getLocStart(), | |||
| 5314 | DestType, Initializer->getType(), | |||
| 5315 | Initializer) || | |||
| 5316 | S.ConversionToObjCStringLiteralCheck(DestType, Initializer)) | |||
| 5317 | Args[0] = Initializer; | |||
| 5318 | } | |||
| 5319 | if (!isa<InitListExpr>(Initializer)) | |||
| 5320 | SourceType = Initializer->getType(); | |||
| 5321 | } | |||
| 5322 | ||||
| 5323 | // - If the initializer is a (non-parenthesized) braced-init-list, the | |||
| 5324 | // object is list-initialized (8.5.4). | |||
| 5325 | if (Kind.getKind() != InitializationKind::IK_Direct) { | |||
| 5326 | if (InitListExpr *InitList = dyn_cast_or_null<InitListExpr>(Initializer)) { | |||
| 5327 | TryListInitialization(S, Entity, Kind, InitList, *this, | |||
| 5328 | TreatUnavailableAsInvalid); | |||
| 5329 | return; | |||
| 5330 | } | |||
| 5331 | } | |||
| 5332 | ||||
| 5333 | // - If the destination type is a reference type, see 8.5.3. | |||
| 5334 | if (DestType->isReferenceType()) { | |||
| 5335 | // C++0x [dcl.init.ref]p1: | |||
| 5336 | // A variable declared to be a T& or T&&, that is, "reference to type T" | |||
| 5337 | // (8.3.2), shall be initialized by an object, or function, of type T or | |||
| 5338 | // by an object that can be converted into a T. | |||
| 5339 | // (Therefore, multiple arguments are not permitted.) | |||
| 5340 | if (Args.size() != 1) | |||
| 5341 | SetFailed(FK_TooManyInitsForReference); | |||
| 5342 | // C++17 [dcl.init.ref]p5: | |||
| 5343 | // A reference [...] is initialized by an expression [...] as follows: | |||
| 5344 | // If the initializer is not an expression, presumably we should reject, | |||
| 5345 | // but the standard fails to actually say so. | |||
| 5346 | else if (isa<InitListExpr>(Args[0])) | |||
| 5347 | SetFailed(FK_ParenthesizedListInitForReference); | |||
| 5348 | else | |||
| 5349 | TryReferenceInitialization(S, Entity, Kind, Args[0], *this); | |||
| 5350 | return; | |||
| 5351 | } | |||
| 5352 | ||||
| 5353 | // - If the initializer is (), the object is value-initialized. | |||
| 5354 | if (Kind.getKind() == InitializationKind::IK_Value || | |||
| 5355 | (Kind.getKind() == InitializationKind::IK_Direct && Args.empty())) { | |||
| 5356 | TryValueInitialization(S, Entity, Kind, *this); | |||
| 5357 | return; | |||
| 5358 | } | |||
| 5359 | ||||
| 5360 | // Handle default initialization. | |||
| 5361 | if (Kind.getKind() == InitializationKind::IK_Default) { | |||
| 5362 | TryDefaultInitialization(S, Entity, Kind, *this); | |||
| 5363 | return; | |||
| 5364 | } | |||
| 5365 | ||||
| 5366 | // - If the destination type is an array of characters, an array of | |||
| 5367 | // char16_t, an array of char32_t, or an array of wchar_t, and the | |||
| 5368 | // initializer is a string literal, see 8.5.2. | |||
| 5369 | // - Otherwise, if the destination type is an array, the program is | |||
| 5370 | // ill-formed. | |||
| 5371 | if (const ArrayType *DestAT = Context.getAsArrayType(DestType)) { | |||
| 5372 | if (Initializer && isa<VariableArrayType>(DestAT)) { | |||
| 5373 | SetFailed(FK_VariableLengthArrayHasInitializer); | |||
| 5374 | return; | |||
| 5375 | } | |||
| 5376 | ||||
| 5377 | if (Initializer) { | |||
| 5378 | switch (IsStringInit(Initializer, DestAT, Context)) { | |||
| 5379 | case SIF_None: | |||
| 5380 | TryStringLiteralInitialization(S, Entity, Kind, Initializer, *this); | |||
| 5381 | return; | |||
| 5382 | case SIF_NarrowStringIntoWideChar: | |||
| 5383 | SetFailed(FK_NarrowStringIntoWideCharArray); | |||
| 5384 | return; | |||
| 5385 | case SIF_WideStringIntoChar: | |||
| 5386 | SetFailed(FK_WideStringIntoCharArray); | |||
| 5387 | return; | |||
| 5388 | case SIF_IncompatWideStringIntoWideChar: | |||
| 5389 | SetFailed(FK_IncompatWideStringIntoWideChar); | |||
| 5390 | return; | |||
| 5391 | case SIF_PlainStringIntoUTF8Char: | |||
| 5392 | SetFailed(FK_PlainStringIntoUTF8Char); | |||
| 5393 | return; | |||
| 5394 | case SIF_UTF8StringIntoPlainChar: | |||
| 5395 | SetFailed(FK_UTF8StringIntoPlainChar); | |||
| 5396 | return; | |||
| 5397 | case SIF_Other: | |||
| 5398 | break; | |||
| 5399 | } | |||
| 5400 | } | |||
| 5401 | ||||
| 5402 | // Some kinds of initialization permit an array to be initialized from | |||
| 5403 | // another array of the same type, and perform elementwise initialization. | |||
| 5404 | if (Initializer && isa<ConstantArrayType>(DestAT) && | |||
| 5405 | S.Context.hasSameUnqualifiedType(Initializer->getType(), | |||
| 5406 | Entity.getType()) && | |||
| 5407 | canPerformArrayCopy(Entity)) { | |||
| 5408 | // If source is a prvalue, use it directly. | |||
| 5409 | if (Initializer->getValueKind() == VK_RValue) { | |||
| 5410 | AddArrayInitStep(DestType, /*IsGNUExtension*/false); | |||
| 5411 | return; | |||
| 5412 | } | |||
| 5413 | ||||
| 5414 | // Emit element-at-a-time copy loop. | |||
| 5415 | InitializedEntity Element = | |||
| 5416 | InitializedEntity::InitializeElement(S.Context, 0, Entity); | |||
| 5417 | QualType InitEltT = | |||
| 5418 | Context.getAsArrayType(Initializer->getType())->getElementType(); | |||
| 5419 | OpaqueValueExpr OVE(Initializer->getExprLoc(), InitEltT, | |||
| 5420 | Initializer->getValueKind(), | |||
| 5421 | Initializer->getObjectKind()); | |||
| 5422 | Expr *OVEAsExpr = &OVE; | |||
| 5423 | InitializeFrom(S, Element, Kind, OVEAsExpr, TopLevelOfInitList, | |||
| 5424 | TreatUnavailableAsInvalid); | |||
| 5425 | if (!Failed()) | |||
| 5426 | AddArrayInitLoopStep(Entity.getType(), InitEltT); | |||
| 5427 | return; | |||
| 5428 | } | |||
| 5429 | ||||
| 5430 | // Note: as an GNU C extension, we allow initialization of an | |||
| 5431 | // array from a compound literal that creates an array of the same | |||
| 5432 | // type, so long as the initializer has no side effects. | |||
| 5433 | if (!S.getLangOpts().CPlusPlus && Initializer && | |||
| 5434 | isa<CompoundLiteralExpr>(Initializer->IgnoreParens()) && | |||
| 5435 | Initializer->getType()->isArrayType()) { | |||
| 5436 | const ArrayType *SourceAT | |||
| 5437 | = Context.getAsArrayType(Initializer->getType()); | |||
| 5438 | if (!hasCompatibleArrayTypes(S.Context, DestAT, SourceAT)) | |||
| 5439 | SetFailed(FK_ArrayTypeMismatch); | |||
| 5440 | else if (Initializer->HasSideEffects(S.Context)) | |||
| 5441 | SetFailed(FK_NonConstantArrayInit); | |||
| 5442 | else { | |||
| 5443 | AddArrayInitStep(DestType, /*IsGNUExtension*/true); | |||
| 5444 | } | |||
| 5445 | } | |||
| 5446 | // Note: as a GNU C++ extension, we allow list-initialization of a | |||
| 5447 | // class member of array type from a parenthesized initializer list. | |||
| 5448 | else if (S.getLangOpts().CPlusPlus && | |||
| 5449 | Entity.getKind() == InitializedEntity::EK_Member && | |||
| 5450 | Initializer && isa<InitListExpr>(Initializer)) { | |||
| 5451 | TryListInitialization(S, Entity, Kind, cast<InitListExpr>(Initializer), | |||
| 5452 | *this, TreatUnavailableAsInvalid); | |||
| 5453 | AddParenthesizedArrayInitStep(DestType); | |||
| 5454 | } else if (DestAT->getElementType()->isCharType()) | |||
| 5455 | SetFailed(FK_ArrayNeedsInitListOrStringLiteral); | |||
| 5456 | else if (IsWideCharCompatible(DestAT->getElementType(), Context)) | |||
| 5457 | SetFailed(FK_ArrayNeedsInitListOrWideStringLiteral); | |||
| 5458 | else | |||
| 5459 | SetFailed(FK_ArrayNeedsInitList); | |||
| 5460 | ||||
| 5461 | return; | |||
| 5462 | } | |||
| 5463 | ||||
| 5464 | // Determine whether we should consider writeback conversions for | |||
| 5465 | // Objective-C ARC. | |||
| 5466 | bool allowObjCWritebackConversion = S.getLangOpts().ObjCAutoRefCount && | |||
| 5467 | Entity.isParameterKind(); | |||
| 5468 | ||||
| 5469 | // We're at the end of the line for C: it's either a write-back conversion | |||
| 5470 | // or it's a C assignment. There's no need to check anything else. | |||
| 5471 | if (!S.getLangOpts().CPlusPlus) { | |||
| 5472 | // If allowed, check whether this is an Objective-C writeback conversion. | |||
| 5473 | if (allowObjCWritebackConversion && | |||
| 5474 | tryObjCWritebackConversion(S, *this, Entity, Initializer)) { | |||
| 5475 | return; | |||
| 5476 | } | |||
| 5477 | ||||
| 5478 | if (TryOCLSamplerInitialization(S, *this, DestType, Initializer)) | |||
| 5479 | return; | |||
| 5480 | ||||
| 5481 | if (TryOCLZeroEventInitialization(S, *this, DestType, Initializer)) | |||
| 5482 | return; | |||
| 5483 | ||||
| 5484 | if (TryOCLZeroQueueInitialization(S, *this, DestType, Initializer)) | |||
| 5485 | return; | |||
| 5486 | ||||
| 5487 | // Handle initialization in C | |||
| 5488 | AddCAssignmentStep(DestType); | |||
| 5489 | MaybeProduceObjCObject(S, *this, Entity); | |||
| 5490 | return; | |||
| 5491 | } | |||
| 5492 | ||||
| 5493 | assert(S.getLangOpts().CPlusPlus)(static_cast <bool> (S.getLangOpts().CPlusPlus) ? void ( 0) : __assert_fail ("S.getLangOpts().CPlusPlus", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 5493, __extension__ __PRETTY_FUNCTION__)); | |||
| 5494 | ||||
| 5495 | // - If the destination type is a (possibly cv-qualified) class type: | |||
| 5496 | if (DestType->isRecordType()) { | |||
| 5497 | // - If the initialization is direct-initialization, or if it is | |||
| 5498 | // copy-initialization where the cv-unqualified version of the | |||
| 5499 | // source type is the same class as, or a derived class of, the | |||
| 5500 | // class of the destination, constructors are considered. [...] | |||
| 5501 | if (Kind.getKind() == InitializationKind::IK_Direct || | |||
| 5502 | (Kind.getKind() == InitializationKind::IK_Copy && | |||
| 5503 | (Context.hasSameUnqualifiedType(SourceType, DestType) || | |||
| 5504 | S.IsDerivedFrom(Initializer->getLocStart(), SourceType, DestType)))) | |||
| 5505 | TryConstructorInitialization(S, Entity, Kind, Args, | |||
| 5506 | DestType, DestType, *this); | |||
| 5507 | // - Otherwise (i.e., for the remaining copy-initialization cases), | |||
| 5508 | // user-defined conversion sequences that can convert from the source | |||
| 5509 | // type to the destination type or (when a conversion function is | |||
| 5510 | // used) to a derived class thereof are enumerated as described in | |||
| 5511 | // 13.3.1.4, and the best one is chosen through overload resolution | |||
| 5512 | // (13.3). | |||
| 5513 | else | |||
| 5514 | TryUserDefinedConversion(S, DestType, Kind, Initializer, *this, | |||
| 5515 | TopLevelOfInitList); | |||
| 5516 | return; | |||
| 5517 | } | |||
| 5518 | ||||
| 5519 | assert(Args.size() >= 1 && "Zero-argument case handled above")(static_cast <bool> (Args.size() >= 1 && "Zero-argument case handled above" ) ? void (0) : __assert_fail ("Args.size() >= 1 && \"Zero-argument case handled above\"" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 5519, __extension__ __PRETTY_FUNCTION__)); | |||
| 5520 | ||||
| 5521 | // The remaining cases all need a source type. | |||
| 5522 | if (Args.size() > 1) { | |||
| 5523 | SetFailed(FK_TooManyInitsForScalar); | |||
| 5524 | return; | |||
| 5525 | } else if (isa<InitListExpr>(Args[0])) { | |||
| 5526 | SetFailed(FK_ParenthesizedListInitForScalar); | |||
| 5527 | return; | |||
| 5528 | } | |||
| 5529 | ||||
| 5530 | // - Otherwise, if the source type is a (possibly cv-qualified) class | |||
| 5531 | // type, conversion functions are considered. | |||
| 5532 | if (!SourceType.isNull() && SourceType->isRecordType()) { | |||
| 5533 | // For a conversion to _Atomic(T) from either T or a class type derived | |||
| 5534 | // from T, initialize the T object then convert to _Atomic type. | |||
| 5535 | bool NeedAtomicConversion = false; | |||
| 5536 | if (const AtomicType *Atomic = DestType->getAs<AtomicType>()) { | |||
| 5537 | if (Context.hasSameUnqualifiedType(SourceType, Atomic->getValueType()) || | |||
| 5538 | S.IsDerivedFrom(Initializer->getLocStart(), SourceType, | |||
| 5539 | Atomic->getValueType())) { | |||
| 5540 | DestType = Atomic->getValueType(); | |||
| 5541 | NeedAtomicConversion = true; | |||
| 5542 | } | |||
| 5543 | } | |||
| 5544 | ||||
| 5545 | TryUserDefinedConversion(S, DestType, Kind, Initializer, *this, | |||
| 5546 | TopLevelOfInitList); | |||
| 5547 | MaybeProduceObjCObject(S, *this, Entity); | |||
| 5548 | if (!Failed() && NeedAtomicConversion) | |||
| 5549 | AddAtomicConversionStep(Entity.getType()); | |||
| 5550 | return; | |||
| 5551 | } | |||
| 5552 | ||||
| 5553 | // - Otherwise, the initial value of the object being initialized is the | |||
| 5554 | // (possibly converted) value of the initializer expression. Standard | |||
| 5555 | // conversions (Clause 4) will be used, if necessary, to convert the | |||
| 5556 | // initializer expression to the cv-unqualified version of the | |||
| 5557 | // destination type; no user-defined conversions are considered. | |||
| 5558 | ||||
| 5559 | ImplicitConversionSequence ICS | |||
| 5560 | = S.TryImplicitConversion(Initializer, DestType, | |||
| 5561 | /*SuppressUserConversions*/true, | |||
| 5562 | /*AllowExplicitConversions*/ false, | |||
| 5563 | /*InOverloadResolution*/ false, | |||
| 5564 | /*CStyle=*/Kind.isCStyleOrFunctionalCast(), | |||
| 5565 | allowObjCWritebackConversion); | |||
| 5566 | ||||
| 5567 | if (ICS.isStandard() && | |||
| 5568 | ICS.Standard.Second == ICK_Writeback_Conversion) { | |||
| 5569 | // Objective-C ARC writeback conversion. | |||
| 5570 | ||||
| 5571 | // We should copy unless we're passing to an argument explicitly | |||
| 5572 | // marked 'out'. | |||
| 5573 | bool ShouldCopy = true; | |||
| 5574 | if (ParmVarDecl *Param = cast_or_null<ParmVarDecl>(Entity.getDecl())) | |||
| 5575 | ShouldCopy = (Param->getObjCDeclQualifier() != ParmVarDecl::OBJC_TQ_Out); | |||
| 5576 | ||||
| 5577 | // If there was an lvalue adjustment, add it as a separate conversion. | |||
| 5578 | if (ICS.Standard.First == ICK_Array_To_Pointer || | |||
| 5579 | ICS.Standard.First == ICK_Lvalue_To_Rvalue) { | |||
| 5580 | ImplicitConversionSequence LvalueICS; | |||
| 5581 | LvalueICS.setStandard(); | |||
| 5582 | LvalueICS.Standard.setAsIdentityConversion(); | |||
| 5583 | LvalueICS.Standard.setAllToTypes(ICS.Standard.getToType(0)); | |||
| 5584 | LvalueICS.Standard.First = ICS.Standard.First; | |||
| 5585 | AddConversionSequenceStep(LvalueICS, ICS.Standard.getToType(0)); | |||
| 5586 | } | |||
| 5587 | ||||
| 5588 | AddPassByIndirectCopyRestoreStep(DestType, ShouldCopy); | |||
| 5589 | } else if (ICS.isBad()) { | |||
| 5590 | DeclAccessPair dap; | |||
| 5591 | if (isLibstdcxxPointerReturnFalseHack(S, Entity, Initializer)) { | |||
| 5592 | AddZeroInitializationStep(Entity.getType()); | |||
| 5593 | } else if (Initializer->getType() == Context.OverloadTy && | |||
| 5594 | !S.ResolveAddressOfOverloadedFunction(Initializer, DestType, | |||
| 5595 | false, dap)) | |||
| 5596 | SetFailed(InitializationSequence::FK_AddressOfOverloadFailed); | |||
| 5597 | else if (Initializer->getType()->isFunctionType() && | |||
| 5598 | isExprAnUnaddressableFunction(S, Initializer)) | |||
| 5599 | SetFailed(InitializationSequence::FK_AddressOfUnaddressableFunction); | |||
| 5600 | else | |||
| 5601 | SetFailed(InitializationSequence::FK_ConversionFailed); | |||
| 5602 | } else { | |||
| 5603 | AddConversionSequenceStep(ICS, DestType, TopLevelOfInitList); | |||
| 5604 | ||||
| 5605 | MaybeProduceObjCObject(S, *this, Entity); | |||
| 5606 | } | |||
| 5607 | } | |||
| 5608 | ||||
| 5609 | InitializationSequence::~InitializationSequence() { | |||
| 5610 | for (auto &S : Steps) | |||
| 5611 | S.Destroy(); | |||
| 5612 | } | |||
| 5613 | ||||
| 5614 | //===----------------------------------------------------------------------===// | |||
| 5615 | // Perform initialization | |||
| 5616 | //===----------------------------------------------------------------------===// | |||
| 5617 | static Sema::AssignmentAction | |||
| 5618 | getAssignmentAction(const InitializedEntity &Entity, bool Diagnose = false) { | |||
| 5619 | switch(Entity.getKind()) { | |||
| 5620 | case InitializedEntity::EK_Variable: | |||
| 5621 | case InitializedEntity::EK_New: | |||
| 5622 | case InitializedEntity::EK_Exception: | |||
| 5623 | case InitializedEntity::EK_Base: | |||
| 5624 | case InitializedEntity::EK_Delegating: | |||
| 5625 | return Sema::AA_Initializing; | |||
| 5626 | ||||
| 5627 | case InitializedEntity::EK_Parameter: | |||
| 5628 | if (Entity.getDecl() && | |||
| 5629 | isa<ObjCMethodDecl>(Entity.getDecl()->getDeclContext())) | |||
| 5630 | return Sema::AA_Sending; | |||
| 5631 | ||||
| 5632 | return Sema::AA_Passing; | |||
| 5633 | ||||
| 5634 | case InitializedEntity::EK_Parameter_CF_Audited: | |||
| 5635 | if (Entity.getDecl() && | |||
| 5636 | isa<ObjCMethodDecl>(Entity.getDecl()->getDeclContext())) | |||
| 5637 | return Sema::AA_Sending; | |||
| 5638 | ||||
| 5639 | return !Diagnose ? Sema::AA_Passing : Sema::AA_Passing_CFAudited; | |||
| 5640 | ||||
| 5641 | case InitializedEntity::EK_Result: | |||
| 5642 | case InitializedEntity::EK_StmtExprResult: // FIXME: Not quite right. | |||
| 5643 | return Sema::AA_Returning; | |||
| 5644 | ||||
| 5645 | case InitializedEntity::EK_Temporary: | |||
| 5646 | case InitializedEntity::EK_RelatedResult: | |||
| 5647 | // FIXME: Can we tell apart casting vs. converting? | |||
| 5648 | return Sema::AA_Casting; | |||
| 5649 | ||||
| 5650 | case InitializedEntity::EK_Member: | |||
| 5651 | case InitializedEntity::EK_Binding: | |||
| 5652 | case InitializedEntity::EK_ArrayElement: | |||
| 5653 | case InitializedEntity::EK_VectorElement: | |||
| 5654 | case InitializedEntity::EK_ComplexElement: | |||
| 5655 | case InitializedEntity::EK_BlockElement: | |||
| 5656 | case InitializedEntity::EK_LambdaToBlockConversionBlockElement: | |||
| 5657 | case InitializedEntity::EK_LambdaCapture: | |||
| 5658 | case InitializedEntity::EK_CompoundLiteralInit: | |||
| 5659 | return Sema::AA_Initializing; | |||
| 5660 | } | |||
| 5661 | ||||
| 5662 | llvm_unreachable("Invalid EntityKind!")::llvm::llvm_unreachable_internal("Invalid EntityKind!", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 5662); | |||
| 5663 | } | |||
| 5664 | ||||
| 5665 | /// Whether we should bind a created object as a temporary when | |||
| 5666 | /// initializing the given entity. | |||
| 5667 | static bool shouldBindAsTemporary(const InitializedEntity &Entity) { | |||
| 5668 | switch (Entity.getKind()) { | |||
| 5669 | case InitializedEntity::EK_ArrayElement: | |||
| 5670 | case InitializedEntity::EK_Member: | |||
| 5671 | case InitializedEntity::EK_Result: | |||
| 5672 | case InitializedEntity::EK_StmtExprResult: | |||
| 5673 | case InitializedEntity::EK_New: | |||
| 5674 | case InitializedEntity::EK_Variable: | |||
| 5675 | case InitializedEntity::EK_Base: | |||
| 5676 | case InitializedEntity::EK_Delegating: | |||
| 5677 | case InitializedEntity::EK_VectorElement: | |||
| 5678 | case InitializedEntity::EK_ComplexElement: | |||
| 5679 | case InitializedEntity::EK_Exception: | |||
| 5680 | case InitializedEntity::EK_BlockElement: | |||
| 5681 | case InitializedEntity::EK_LambdaToBlockConversionBlockElement: | |||
| 5682 | case InitializedEntity::EK_LambdaCapture: | |||
| 5683 | case InitializedEntity::EK_CompoundLiteralInit: | |||
| 5684 | return false; | |||
| 5685 | ||||
| 5686 | case InitializedEntity::EK_Parameter: | |||
| 5687 | case InitializedEntity::EK_Parameter_CF_Audited: | |||
| 5688 | case InitializedEntity::EK_Temporary: | |||
| 5689 | case InitializedEntity::EK_RelatedResult: | |||
| 5690 | case InitializedEntity::EK_Binding: | |||
| 5691 | return true; | |||
| 5692 | } | |||
| 5693 | ||||
| 5694 | llvm_unreachable("missed an InitializedEntity kind?")::llvm::llvm_unreachable_internal("missed an InitializedEntity kind?" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 5694); | |||
| 5695 | } | |||
| 5696 | ||||
| 5697 | /// Whether the given entity, when initialized with an object | |||
| 5698 | /// created for that initialization, requires destruction. | |||
| 5699 | static bool shouldDestroyEntity(const InitializedEntity &Entity) { | |||
| 5700 | switch (Entity.getKind()) { | |||
| 5701 | case InitializedEntity::EK_Result: | |||
| 5702 | case InitializedEntity::EK_StmtExprResult: | |||
| 5703 | case InitializedEntity::EK_New: | |||
| 5704 | case InitializedEntity::EK_Base: | |||
| 5705 | case InitializedEntity::EK_Delegating: | |||
| 5706 | case InitializedEntity::EK_VectorElement: | |||
| 5707 | case InitializedEntity::EK_ComplexElement: | |||
| 5708 | case InitializedEntity::EK_BlockElement: | |||
| 5709 | case InitializedEntity::EK_LambdaToBlockConversionBlockElement: | |||
| 5710 | case InitializedEntity::EK_LambdaCapture: | |||
| 5711 | return false; | |||
| 5712 | ||||
| 5713 | case InitializedEntity::EK_Member: | |||
| 5714 | case InitializedEntity::EK_Binding: | |||
| 5715 | case InitializedEntity::EK_Variable: | |||
| 5716 | case InitializedEntity::EK_Parameter: | |||
| 5717 | case InitializedEntity::EK_Parameter_CF_Audited: | |||
| 5718 | case InitializedEntity::EK_Temporary: | |||
| 5719 | case InitializedEntity::EK_ArrayElement: | |||
| 5720 | case InitializedEntity::EK_Exception: | |||
| 5721 | case InitializedEntity::EK_CompoundLiteralInit: | |||
| 5722 | case InitializedEntity::EK_RelatedResult: | |||
| 5723 | return true; | |||
| 5724 | } | |||
| 5725 | ||||
| 5726 | llvm_unreachable("missed an InitializedEntity kind?")::llvm::llvm_unreachable_internal("missed an InitializedEntity kind?" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 5726); | |||
| 5727 | } | |||
| 5728 | ||||
| 5729 | /// Get the location at which initialization diagnostics should appear. | |||
| 5730 | static SourceLocation getInitializationLoc(const InitializedEntity &Entity, | |||
| 5731 | Expr *Initializer) { | |||
| 5732 | switch (Entity.getKind()) { | |||
| 5733 | case InitializedEntity::EK_Result: | |||
| 5734 | case InitializedEntity::EK_StmtExprResult: | |||
| 5735 | return Entity.getReturnLoc(); | |||
| 5736 | ||||
| 5737 | case InitializedEntity::EK_Exception: | |||
| 5738 | return Entity.getThrowLoc(); | |||
| 5739 | ||||
| 5740 | case InitializedEntity::EK_Variable: | |||
| 5741 | case InitializedEntity::EK_Binding: | |||
| 5742 | return Entity.getDecl()->getLocation(); | |||
| 5743 | ||||
| 5744 | case InitializedEntity::EK_LambdaCapture: | |||
| 5745 | return Entity.getCaptureLoc(); | |||
| 5746 | ||||
| 5747 | case InitializedEntity::EK_ArrayElement: | |||
| 5748 | case InitializedEntity::EK_Member: | |||
| 5749 | case InitializedEntity::EK_Parameter: | |||
| 5750 | case InitializedEntity::EK_Parameter_CF_Audited: | |||
| 5751 | case InitializedEntity::EK_Temporary: | |||
| 5752 | case InitializedEntity::EK_New: | |||
| 5753 | case InitializedEntity::EK_Base: | |||
| 5754 | case InitializedEntity::EK_Delegating: | |||
| 5755 | case InitializedEntity::EK_VectorElement: | |||
| 5756 | case InitializedEntity::EK_ComplexElement: | |||
| 5757 | case InitializedEntity::EK_BlockElement: | |||
| 5758 | case InitializedEntity::EK_LambdaToBlockConversionBlockElement: | |||
| 5759 | case InitializedEntity::EK_CompoundLiteralInit: | |||
| 5760 | case InitializedEntity::EK_RelatedResult: | |||
| 5761 | return Initializer->getLocStart(); | |||
| 5762 | } | |||
| 5763 | llvm_unreachable("missed an InitializedEntity kind?")::llvm::llvm_unreachable_internal("missed an InitializedEntity kind?" , "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 5763); | |||
| 5764 | } | |||
| 5765 | ||||
| 5766 | /// Make a (potentially elidable) temporary copy of the object | |||
| 5767 | /// provided by the given initializer by calling the appropriate copy | |||
| 5768 | /// constructor. | |||
| 5769 | /// | |||
| 5770 | /// \param S The Sema object used for type-checking. | |||
| 5771 | /// | |||
| 5772 | /// \param T The type of the temporary object, which must either be | |||
| 5773 | /// the type of the initializer expression or a superclass thereof. | |||
| 5774 | /// | |||
| 5775 | /// \param Entity The entity being initialized. | |||
| 5776 | /// | |||
| 5777 | /// \param CurInit The initializer expression. | |||
| 5778 | /// | |||
| 5779 | /// \param IsExtraneousCopy Whether this is an "extraneous" copy that | |||
| 5780 | /// is permitted in C++03 (but not C++0x) when binding a reference to | |||
| 5781 | /// an rvalue. | |||
| 5782 | /// | |||
| 5783 | /// \returns An expression that copies the initializer expression into | |||
| 5784 | /// a temporary object, or an error expression if a copy could not be | |||
| 5785 | /// created. | |||
| 5786 | static ExprResult CopyObject(Sema &S, | |||
| 5787 | QualType T, | |||
| 5788 | const InitializedEntity &Entity, | |||
| 5789 | ExprResult CurInit, | |||
| 5790 | bool IsExtraneousCopy) { | |||
| 5791 | if (CurInit.isInvalid()) | |||
| 5792 | return CurInit; | |||
| 5793 | // Determine which class type we're copying to. | |||
| 5794 | Expr *CurInitExpr = (Expr *)CurInit.get(); | |||
| 5795 | CXXRecordDecl *Class = nullptr; | |||
| 5796 | if (const RecordType *Record = T->getAs<RecordType>()) | |||
| 5797 | Class = cast<CXXRecordDecl>(Record->getDecl()); | |||
| 5798 | if (!Class) | |||
| 5799 | return CurInit; | |||
| 5800 | ||||
| 5801 | SourceLocation Loc = getInitializationLoc(Entity, CurInit.get()); | |||
| 5802 | ||||
| 5803 | // Make sure that the type we are copying is complete. | |||
| 5804 | if (S.RequireCompleteType(Loc, T, diag::err_temp_copy_incomplete)) | |||
| 5805 | return CurInit; | |||
| 5806 | ||||
| 5807 | // Perform overload resolution using the class's constructors. Per | |||
| 5808 | // C++11 [dcl.init]p16, second bullet for class types, this initialization | |||
| 5809 | // is direct-initialization. | |||
| 5810 | OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Normal); | |||
| 5811 | DeclContext::lookup_result Ctors = S.LookupConstructors(Class); | |||
| 5812 | ||||
| 5813 | OverloadCandidateSet::iterator Best; | |||
| 5814 | switch (ResolveConstructorOverload( | |||
| 5815 | S, Loc, CurInitExpr, CandidateSet, T, Ctors, Best, | |||
| 5816 | /*CopyInitializing=*/false, /*AllowExplicit=*/true, | |||
| 5817 | /*OnlyListConstructors=*/false, /*IsListInit=*/false, | |||
| 5818 | /*SecondStepOfCopyInit=*/true)) { | |||
| 5819 | case OR_Success: | |||
| 5820 | break; | |||
| 5821 | ||||
| 5822 | case OR_No_Viable_Function: | |||
| 5823 | S.Diag(Loc, IsExtraneousCopy && !S.isSFINAEContext() | |||
| 5824 | ? diag::ext_rvalue_to_reference_temp_copy_no_viable | |||
| 5825 | : diag::err_temp_copy_no_viable) | |||
| 5826 | << (int)Entity.getKind() << CurInitExpr->getType() | |||
| 5827 | << CurInitExpr->getSourceRange(); | |||
| 5828 | CandidateSet.NoteCandidates(S, OCD_AllCandidates, CurInitExpr); | |||
| 5829 | if (!IsExtraneousCopy || S.isSFINAEContext()) | |||
| 5830 | return ExprError(); | |||
| 5831 | return CurInit; | |||
| 5832 | ||||
| 5833 | case OR_Ambiguous: | |||
| 5834 | S.Diag(Loc, diag::err_temp_copy_ambiguous) | |||
| 5835 | << (int)Entity.getKind() << CurInitExpr->getType() | |||
| 5836 | << CurInitExpr->getSourceRange(); | |||
| 5837 | CandidateSet.NoteCandidates(S, OCD_ViableCandidates, CurInitExpr); | |||
| 5838 | return ExprError(); | |||
| 5839 | ||||
| 5840 | case OR_Deleted: | |||
| 5841 | S.Diag(Loc, diag::err_temp_copy_deleted) | |||
| 5842 | << (int)Entity.getKind() << CurInitExpr->getType() | |||
| 5843 | << CurInitExpr->getSourceRange(); | |||
| 5844 | S.NoteDeletedFunction(Best->Function); | |||
| 5845 | return ExprError(); | |||
| 5846 | } | |||
| 5847 | ||||
| 5848 | bool HadMultipleCandidates = CandidateSet.size() > 1; | |||
| 5849 | ||||
| 5850 | CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Best->Function); | |||
| 5851 | SmallVector<Expr*, 8> ConstructorArgs; | |||
| 5852 | CurInit.get(); // Ownership transferred into MultiExprArg, below. | |||
| 5853 | ||||
| 5854 | S.CheckConstructorAccess(Loc, Constructor, Best->FoundDecl, Entity, | |||
| 5855 | IsExtraneousCopy); | |||
| 5856 | ||||
| 5857 | if (IsExtraneousCopy) { | |||
| 5858 | // If this is a totally extraneous copy for C++03 reference | |||
| 5859 | // binding purposes, just return the original initialization | |||
| 5860 | // expression. We don't generate an (elided) copy operation here | |||
| 5861 | // because doing so would require us to pass down a flag to avoid | |||
| 5862 | // infinite recursion, where each step adds another extraneous, | |||
| 5863 | // elidable copy. | |||
| 5864 | ||||
| 5865 | // Instantiate the default arguments of any extra parameters in | |||
| 5866 | // the selected copy constructor, as if we were going to create a | |||
| 5867 | // proper call to the copy constructor. | |||
| 5868 | for (unsigned I = 1, N = Constructor->getNumParams(); I != N; ++I) { | |||
| 5869 | ParmVarDecl *Parm = Constructor->getParamDecl(I); | |||
| 5870 | if (S.RequireCompleteType(Loc, Parm->getType(), | |||
| 5871 | diag::err_call_incomplete_argument)) | |||
| 5872 | break; | |||
| 5873 | ||||
| 5874 | // Build the default argument expression; we don't actually care | |||
| 5875 | // if this succeeds or not, because this routine will complain | |||
| 5876 | // if there was a problem. | |||
| 5877 | S.BuildCXXDefaultArgExpr(Loc, Constructor, Parm); | |||
| 5878 | } | |||
| 5879 | ||||
| 5880 | return CurInitExpr; | |||
| 5881 | } | |||
| 5882 | ||||
| 5883 | // Determine the arguments required to actually perform the | |||
| 5884 | // constructor call (we might have derived-to-base conversions, or | |||
| 5885 | // the copy constructor may have default arguments). | |||
| 5886 | if (S.CompleteConstructorCall(Constructor, CurInitExpr, Loc, ConstructorArgs)) | |||
| 5887 | return ExprError(); | |||
| 5888 | ||||
| 5889 | // C++0x [class.copy]p32: | |||
| 5890 | // When certain criteria are met, an implementation is allowed to | |||
| 5891 | // omit the copy/move construction of a class object, even if the | |||
| 5892 | // copy/move constructor and/or destructor for the object have | |||
| 5893 | // side effects. [...] | |||
| 5894 | // - when a temporary class object that has not been bound to a | |||
| 5895 | // reference (12.2) would be copied/moved to a class object | |||
| 5896 | // with the same cv-unqualified type, the copy/move operation | |||
| 5897 | // can be omitted by constructing the temporary object | |||
| 5898 | // directly into the target of the omitted copy/move | |||
| 5899 | // | |||
| 5900 | // Note that the other three bullets are handled elsewhere. Copy | |||
| 5901 | // elision for return statements and throw expressions are handled as part | |||
| 5902 | // of constructor initialization, while copy elision for exception handlers | |||
| 5903 | // is handled by the run-time. | |||
| 5904 | // | |||
| 5905 | // FIXME: If the function parameter is not the same type as the temporary, we | |||
| 5906 | // should still be able to elide the copy, but we don't have a way to | |||
| 5907 | // represent in the AST how much should be elided in this case. | |||
| 5908 | bool Elidable = | |||
| 5909 | CurInitExpr->isTemporaryObject(S.Context, Class) && | |||
| 5910 | S.Context.hasSameUnqualifiedType( | |||
| 5911 | Best->Function->getParamDecl(0)->getType().getNonReferenceType(), | |||
| 5912 | CurInitExpr->getType()); | |||
| 5913 | ||||
| 5914 | // Actually perform the constructor call. | |||
| 5915 | CurInit = S.BuildCXXConstructExpr(Loc, T, Best->FoundDecl, Constructor, | |||
| 5916 | Elidable, | |||
| 5917 | ConstructorArgs, | |||
| 5918 | HadMultipleCandidates, | |||
| 5919 | /*ListInit*/ false, | |||
| 5920 | /*StdInitListInit*/ false, | |||
| 5921 | /*ZeroInit*/ false, | |||
| 5922 | CXXConstructExpr::CK_Complete, | |||
| 5923 | SourceRange()); | |||
| 5924 | ||||
| 5925 | // If we're supposed to bind temporaries, do so. | |||
| 5926 | if (!CurInit.isInvalid() && shouldBindAsTemporary(Entity)) | |||
| 5927 | CurInit = S.MaybeBindToTemporary(CurInit.getAs<Expr>()); | |||
| 5928 | return CurInit; | |||
| 5929 | } | |||
| 5930 | ||||
| 5931 | /// Check whether elidable copy construction for binding a reference to | |||
| 5932 | /// a temporary would have succeeded if we were building in C++98 mode, for | |||
| 5933 | /// -Wc++98-compat. | |||
| 5934 | static void CheckCXX98CompatAccessibleCopy(Sema &S, | |||
| 5935 | const InitializedEntity &Entity, | |||
| 5936 | Expr *CurInitExpr) { | |||
| 5937 | assert(S.getLangOpts().CPlusPlus11)(static_cast <bool> (S.getLangOpts().CPlusPlus11) ? void (0) : __assert_fail ("S.getLangOpts().CPlusPlus11", "/build/llvm-toolchain-snapshot-7~svn338205/tools/clang/lib/Sema/SemaInit.cpp" , 5937, __extension__ __PRETTY_FUNCTION__)); | |||
| 5938 | ||||
| 5939 | const RecordType *Record = CurInitExpr->getType()->getAs<RecordType>(); | |||
| 5940 | if (!Record) | |||
| 5941 | return; | |||
| 5942 | ||||
| 5943 | SourceLocation Loc = getInitializationLoc(Entity, CurInitExpr); | |||
| 5944 | if (S.Diags.isIgnored(diag::warn_cxx98_compat_temp_copy, Loc)) | |||
| 5945 | return; | |||
| 5946 | ||||
| 5947 | // Find constructors which would have been considered. | |||
| 5948 | OverloadCandidateSet CandidateSet(Loc, OverloadCandidateSet::CSK_Normal); | |||
| 5949 | DeclContext::lookup_result Ctors = | |||
| 5950 | S.LookupConstructors(cast<CXXRecordDecl>(Record->getDecl())); | |||
| 5951 | ||||
| 5952 | // Perform overload resolution. |