clang/lib/Sema/DeclSpec.cpp

   1 //===--- DeclSpec.cpp - Declaration Specifier Semantic Analysis -----------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 //  This file implements semantic analysis for declaration specifiers.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "clang/Sema/DeclSpec.h"
  14 #include "clang/AST/ASTContext.h"
  15 #include "clang/AST/DeclCXX.h"
  16 #include "clang/AST/Expr.h"
  17 #include "clang/AST/LocInfoType.h"
  18 #include "clang/AST/TypeLoc.h"
  19 #include "clang/Basic/LangOptions.h"
  20 #include "clang/Basic/SourceManager.h"
  21 #include "clang/Basic/Specifiers.h"
  22 #include "clang/Basic/TargetInfo.h"
  23 #include "clang/Sema/ParsedTemplate.h"
  24 #include "clang/Sema/Sema.h"
  25 #include "clang/Sema/SemaDiagnostic.h"
  26 #include "llvm/ADT/STLExtras.h"
  27 #include "llvm/ADT/SmallString.h"
  28 #include <cstring>
  29 using namespace clang;
  30
  31
  32 void UnqualifiedId::setTemplateId(TemplateIdAnnotation *TemplateId) {
  33   assert(TemplateId && "NULL template-id annotation?");
  34   assert(!TemplateId->isInvalid() &&
  35          "should not convert invalid template-ids to unqualified-ids");
  36
  37   Kind = UnqualifiedIdKind::IK_TemplateId;
  38   this->TemplateId = TemplateId;
  39   StartLocation = TemplateId->TemplateNameLoc;
  40   EndLocation = TemplateId->RAngleLoc;
  41 }
  42
  43 void UnqualifiedId::setConstructorTemplateId(TemplateIdAnnotation *TemplateId) {
  44   assert(TemplateId && "NULL template-id annotation?");
  45   assert(!TemplateId->isInvalid() &&
  46          "should not convert invalid template-ids to unqualified-ids");
  47
  48   Kind = UnqualifiedIdKind::IK_ConstructorTemplateId;
  49   this->TemplateId = TemplateId;
  50   StartLocation = TemplateId->TemplateNameLoc;
  51   EndLocation = TemplateId->RAngleLoc;
  52 }
  53
  54 void CXXScopeSpec::Extend(ASTContext &Context, SourceLocation TemplateKWLoc,
  55                           TypeLoc TL, SourceLocation ColonColonLoc) {
  56   Builder.Extend(Context, TemplateKWLoc, TL, ColonColonLoc);
  57   if (Range.getBegin().isInvalid())
  58     Range.setBegin(TL.getBeginLoc());
  59   Range.setEnd(ColonColonLoc);
  60
  61   assert(Range == Builder.getSourceRange() &&
  62          "NestedNameSpecifierLoc range computation incorrect");
  63 }
  64
  65 void CXXScopeSpec::Extend(ASTContext &Context, IdentifierInfo *Identifier,
  66                           SourceLocation IdentifierLoc,
  67                           SourceLocation ColonColonLoc) {
  68   Builder.Extend(Context, Identifier, IdentifierLoc, ColonColonLoc);
  69
  70   if (Range.getBegin().isInvalid())
  71     Range.setBegin(IdentifierLoc);
  72   Range.setEnd(ColonColonLoc);
  73
  74   assert(Range == Builder.getSourceRange() &&
  75          "NestedNameSpecifierLoc range computation incorrect");
  76 }
  77
  78 void CXXScopeSpec::Extend(ASTContext &Context, NamespaceDecl *Namespace,
  79                           SourceLocation NamespaceLoc,
  80                           SourceLocation ColonColonLoc) {
  81   Builder.Extend(Context, Namespace, NamespaceLoc, ColonColonLoc);
  82
  83   if (Range.getBegin().isInvalid())
  84     Range.setBegin(NamespaceLoc);
  85   Range.setEnd(ColonColonLoc);
  86
  87   assert(Range == Builder.getSourceRange() &&
  88          "NestedNameSpecifierLoc range computation incorrect");
  89 }
  90
  91 void CXXScopeSpec::Extend(ASTContext &Context, NamespaceAliasDecl *Alias,
  92                           SourceLocation AliasLoc,
  93                           SourceLocation ColonColonLoc) {
  94   Builder.Extend(Context, Alias, AliasLoc, ColonColonLoc);
  95
  96   if (Range.getBegin().isInvalid())
  97     Range.setBegin(AliasLoc);
  98   Range.setEnd(ColonColonLoc);
  99
 100   assert(Range == Builder.getSourceRange() &&
 101          "NestedNameSpecifierLoc range computation incorrect");
 102 }
 103
 104 void CXXScopeSpec::MakeGlobal(ASTContext &Context,
 105                               SourceLocation ColonColonLoc) {
 106   Builder.MakeGlobal(Context, ColonColonLoc);
 107
 108   Range = SourceRange(ColonColonLoc);
 109
 110   assert(Range == Builder.getSourceRange() &&
 111          "NestedNameSpecifierLoc range computation incorrect");
 112 }
 113
 114 void CXXScopeSpec::MakeSuper(ASTContext &Context, CXXRecordDecl *RD,
 115                              SourceLocation SuperLoc,
 116                              SourceLocation ColonColonLoc) {
 117   Builder.MakeSuper(Context, RD, SuperLoc, ColonColonLoc);
 118
 119   Range.setBegin(SuperLoc);
 120   Range.setEnd(ColonColonLoc);
 121
 122   assert(Range == Builder.getSourceRange() &&
 123   "NestedNameSpecifierLoc range computation incorrect");
 124 }
 125
 126 void CXXScopeSpec::MakeTrivial(ASTContext &Context,
 127                                NestedNameSpecifier *Qualifier, SourceRange R) {
 128   Builder.MakeTrivial(Context, Qualifier, R);
 129   Range = R;
 130 }
 131
 132 void CXXScopeSpec::Adopt(NestedNameSpecifierLoc Other) {
 133   if (!Other) {
 134     Range = SourceRange();
 135     Builder.Clear();
 136     return;
 137   }
 138
 139   Range = Other.getSourceRange();
 140   Builder.Adopt(Other);
 141   assert(Range == Builder.getSourceRange() &&
 142          "NestedNameSpecifierLoc range computation incorrect");
 143 }
 144
 145 SourceLocation CXXScopeSpec::getLastQualifierNameLoc() const {
 146   if (!Builder.getRepresentation())
 147     return SourceLocation();
 148   return Builder.getTemporary().getLocalBeginLoc();
 149 }
 150
 151 NestedNameSpecifierLoc
 152 CXXScopeSpec::getWithLocInContext(ASTContext &Context) const {
 153   if (!Builder.getRepresentation())
 154     return NestedNameSpecifierLoc();
 155
 156   return Builder.getWithLocInContext(Context);
 157 }
 158
 159 /// DeclaratorChunk::getFunction - Return a DeclaratorChunk for a function.
 160 /// "TheDeclarator" is the declarator that this will be added to.
 161 DeclaratorChunk DeclaratorChunk::getFunction(bool hasProto,
 162                                              bool isAmbiguous,
 163                                              SourceLocation LParenLoc,
 164                                              ParamInfo *Params,
 165                                              unsigned NumParams,
 166                                              SourceLocation EllipsisLoc,
 167                                              SourceLocation RParenLoc,
 168                                              bool RefQualifierIsLvalueRef,
 169                                              SourceLocation RefQualifierLoc,
 170                                              SourceLocation MutableLoc,
 171                                              ExceptionSpecificationType
 172                                                  ESpecType,
 173                                              SourceRange ESpecRange,
 174                                              ParsedType *Exceptions,
 175                                              SourceRange *ExceptionRanges,
 176                                              unsigned NumExceptions,
 177                                              Expr *NoexceptExpr,
 178                                              CachedTokens *ExceptionSpecTokens,
 179                                              ArrayRef<NamedDecl*>
 180                                                  DeclsInPrototype,
 181                                              SourceLocation LocalRangeBegin,
 182                                              SourceLocation LocalRangeEnd,
 183                                              Declarator &TheDeclarator,
 184                                              TypeResult TrailingReturnType,
 185                                              SourceLocation
 186                                                  TrailingReturnTypeLoc,
 187                                              DeclSpec *MethodQualifiers) {
 188   assert(!(MethodQualifiers && MethodQualifiers->getTypeQualifiers() & DeclSpec::TQ_atomic) &&
 189          "function cannot have _Atomic qualifier");
 190
 191   DeclaratorChunk I;
 192   I.Kind                        = Function;
 193   I.Loc                         = LocalRangeBegin;
 194   I.EndLoc                      = LocalRangeEnd;
 195   new (&I.Fun) FunctionTypeInfo;
 196   I.Fun.hasPrototype            = hasProto;
 197   I.Fun.isVariadic              = EllipsisLoc.isValid();
 198   I.Fun.isAmbiguous             = isAmbiguous;
 199   I.Fun.LParenLoc               = LParenLoc;
 200   I.Fun.EllipsisLoc             = EllipsisLoc;
 201   I.Fun.RParenLoc               = RParenLoc;
 202   I.Fun.DeleteParams            = false;
 203   I.Fun.NumParams               = NumParams;
 204   I.Fun.Params                  = nullptr;
 205   I.Fun.RefQualifierIsLValueRef = RefQualifierIsLvalueRef;
 206   I.Fun.RefQualifierLoc         = RefQualifierLoc;
 207   I.Fun.MutableLoc              = MutableLoc;
 208   I.Fun.ExceptionSpecType       = ESpecType;
 209   I.Fun.ExceptionSpecLocBeg     = ESpecRange.getBegin();
 210   I.Fun.ExceptionSpecLocEnd     = ESpecRange.getEnd();
 211   I.Fun.NumExceptionsOrDecls    = 0;
 212   I.Fun.Exceptions              = nullptr;
 213   I.Fun.NoexceptExpr            = nullptr;
 214   I.Fun.HasTrailingReturnType   = TrailingReturnType.isUsable() ||
 215                                   TrailingReturnType.isInvalid();
 216   I.Fun.TrailingReturnType      = TrailingReturnType.get();
 217   I.Fun.TrailingReturnTypeLoc   = TrailingReturnTypeLoc;
 218   I.Fun.MethodQualifiers        = nullptr;
 219   I.Fun.QualAttrFactory         = nullptr;
 220
 221   if (MethodQualifiers && (MethodQualifiers->getTypeQualifiers() ||
 222                            MethodQualifiers->getAttributes().size())) {
 223     auto &attrs = MethodQualifiers->getAttributes();
 224     I.Fun.MethodQualifiers = new DeclSpec(attrs.getPool().getFactory());
 225     MethodQualifiers->forEachCVRUQualifier(
 226         [&](DeclSpec::TQ TypeQual, StringRef PrintName, SourceLocation SL) {
 227           I.Fun.MethodQualifiers->SetTypeQual(TypeQual, SL);
 228         });
 229     I.Fun.MethodQualifiers->getAttributes().takeAllFrom(attrs);
 230     I.Fun.MethodQualifiers->getAttributePool().takeAllFrom(attrs.getPool());
 231   }
 232
 233   assert(I.Fun.ExceptionSpecType == ESpecType && "bitfield overflow");
 234
 235   // new[] a parameter array if needed.
 236   if (NumParams) {
 237     // If the 'InlineParams' in Declarator is unused and big enough, put our
 238     // parameter list there (in an effort to avoid new/delete traffic).  If it
 239     // is already used (consider a function returning a function pointer) or too
 240     // small (function with too many parameters), go to the heap.
 241     if (!TheDeclarator.InlineStorageUsed &&
 242         NumParams <= std::size(TheDeclarator.InlineParams)) {
 243       I.Fun.Params = TheDeclarator.InlineParams;
 244       new (I.Fun.Params) ParamInfo[NumParams];
 245       I.Fun.DeleteParams = false;
 246       TheDeclarator.InlineStorageUsed = true;
 247     } else {
 248       I.Fun.Params = new DeclaratorChunk::ParamInfo[NumParams];
 249       I.Fun.DeleteParams = true;
 250     }
 251     for (unsigned i = 0; i < NumParams; i++)
 252       I.Fun.Params[i] = std::move(Params[i]);
 253   }
 254
 255   // Check what exception specification information we should actually store.
 256   switch (ESpecType) {
 257   default: break; // By default, save nothing.
 258   case EST_Dynamic:
 259     // new[] an exception array if needed
 260     if (NumExceptions) {
 261       I.Fun.NumExceptionsOrDecls = NumExceptions;
 262       I.Fun.Exceptions = new DeclaratorChunk::TypeAndRange[NumExceptions];
 263       for (unsigned i = 0; i != NumExceptions; ++i) {
 264         I.Fun.Exceptions[i].Ty = Exceptions[i];
 265         I.Fun.Exceptions[i].Range = ExceptionRanges[i];
 266       }
 267     }
 268     break;
 269
 270   case EST_DependentNoexcept:
 271   case EST_NoexceptFalse:
 272   case EST_NoexceptTrue:
 273     I.Fun.NoexceptExpr = NoexceptExpr;
 274     break;
 275
 276   case EST_Unparsed:
 277     I.Fun.ExceptionSpecTokens = ExceptionSpecTokens;
 278     break;
 279   }
 280
 281   if (!DeclsInPrototype.empty()) {
 282     assert(ESpecType == EST_None && NumExceptions == 0 &&
 283            "cannot have exception specifiers and decls in prototype");
 284     I.Fun.NumExceptionsOrDecls = DeclsInPrototype.size();
 285     // Copy the array of decls into stable heap storage.
 286     I.Fun.DeclsInPrototype = new NamedDecl *[DeclsInPrototype.size()];
 287     for (size_t J = 0; J < DeclsInPrototype.size(); ++J)
 288       I.Fun.DeclsInPrototype[J] = DeclsInPrototype[J];
 289   }
 290
 291   return I;
 292 }
 293
 294 void Declarator::setDecompositionBindings(
 295     SourceLocation LSquareLoc,
 296     ArrayRef<DecompositionDeclarator::Binding> Bindings,
 297     SourceLocation RSquareLoc) {
 298   assert(!hasName() && "declarator given multiple names!");
 299
 300   BindingGroup.LSquareLoc = LSquareLoc;
 301   BindingGroup.RSquareLoc = RSquareLoc;
 302   BindingGroup.NumBindings = Bindings.size();
 303   Range.setEnd(RSquareLoc);
 304
 305   // We're now past the identifier.
 306   SetIdentifier(nullptr, LSquareLoc);
 307   Name.EndLocation = RSquareLoc;
 308
 309   // Allocate storage for bindings and stash them away.
 310   if (Bindings.size()) {
 311     if (!InlineStorageUsed && Bindings.size() <= std::size(InlineBindings)) {
 312       BindingGroup.Bindings = InlineBindings;
 313       BindingGroup.DeleteBindings = false;
 314       InlineStorageUsed = true;
 315     } else {
 316       BindingGroup.Bindings =
 317           new DecompositionDeclarator::Binding[Bindings.size()];
 318       BindingGroup.DeleteBindings = true;
 319     }
 320     std::uninitialized_copy(Bindings.begin(), Bindings.end(),
 321                             BindingGroup.Bindings);
 322   }
 323 }
 324
 325 bool Declarator::isDeclarationOfFunction() const {
 326   for (unsigned i = 0, i_end = DeclTypeInfo.size(); i < i_end; ++i) {
 327     switch (DeclTypeInfo[i].Kind) {
 328     case DeclaratorChunk::Function:
 329       return true;
 330     case DeclaratorChunk::Paren:
 331       continue;
 332     case DeclaratorChunk::Pointer:
 333     case DeclaratorChunk::Reference:
 334     case DeclaratorChunk::Array:
 335     case DeclaratorChunk::BlockPointer:
 336     case DeclaratorChunk::MemberPointer:
 337     case DeclaratorChunk::Pipe:
 338       return false;
 339     }
 340     llvm_unreachable("Invalid type chunk");
 341   }
 342
 343   switch (DS.getTypeSpecType()) {
 344     case TST_atomic:
 345     case TST_auto:
 346     case TST_auto_type:
 347     case TST_bool:
 348     case TST_char:
 349     case TST_char8:
 350     case TST_char16:
 351     case TST_char32:
 352     case TST_class:
 353     case TST_decimal128:
 354     case TST_decimal32:
 355     case TST_decimal64:
 356     case TST_double:
 357     case TST_Accum:
 358     case TST_Fract:
 359     case TST_Float16:
 360     case TST_float128:
 361     case TST_ibm128:
 362     case TST_enum:
 363     case TST_error:
 364     case TST_float:
 365     case TST_half:
 366     case TST_int:
 367     case TST_int128:
 368     case TST_bitint:
 369     case TST_struct:
 370     case TST_interface:
 371     case TST_union:
 372     case TST_unknown_anytype:
 373     case TST_unspecified:
 374     case TST_void:
 375     case TST_wchar:
 376     case TST_BFloat16:
 377 #define GENERIC_IMAGE_TYPE(ImgType, Id) case TST_##ImgType##_t:
 378 #include "clang/Basic/OpenCLImageTypes.def"
 379       return false;
 380
 381     case TST_decltype_auto:
 382       // This must have an initializer, so can't be a function declaration,
 383       // even if the initializer has function type.
 384       return false;
 385
 386     case TST_decltype:
 387     case TST_typeofExpr:
 388       if (Expr *E = DS.getRepAsExpr())
 389         return E->getType()->isFunctionType();
 390       return false;
 391
 392 #define TRANSFORM_TYPE_TRAIT_DEF(_, Trait) case TST_##Trait:
 393 #include "clang/Basic/TransformTypeTraits.def"
 394     case TST_typename:
 395     case TST_typeofType: {
 396       QualType QT = DS.getRepAsType().get();
 397       if (QT.isNull())
 398         return false;
 399
 400       if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT))
 401         QT = LIT->getType();
 402
 403       if (QT.isNull())
 404         return false;
 405
 406       return QT->isFunctionType();
 407     }
 408   }
 409
 410   llvm_unreachable("Invalid TypeSpecType!");
 411 }
 412
 413 bool Declarator::isStaticMember() {
 414   assert(getContext() == DeclaratorContext::Member);
 415   return getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static ||
 416          (getName().getKind() == UnqualifiedIdKind::IK_OperatorFunctionId &&
 417           CXXMethodDecl::isStaticOverloadedOperator(
 418               getName().OperatorFunctionId.Operator));
 419 }
 420
 421 bool Declarator::isCtorOrDtor() {
 422   return (getName().getKind() == UnqualifiedIdKind::IK_ConstructorName) ||
 423          (getName().getKind() == UnqualifiedIdKind::IK_DestructorName);
 424 }
 425
 426 void DeclSpec::forEachCVRUQualifier(
 427     llvm::function_ref<void(TQ, StringRef, SourceLocation)> Handle) {
 428   if (TypeQualifiers & TQ_const)
 429     Handle(TQ_const, "const", TQ_constLoc);
 430   if (TypeQualifiers & TQ_volatile)
 431     Handle(TQ_volatile, "volatile", TQ_volatileLoc);
 432   if (TypeQualifiers & TQ_restrict)
 433     Handle(TQ_restrict, "restrict", TQ_restrictLoc);
 434   if (TypeQualifiers & TQ_unaligned)
 435     Handle(TQ_unaligned, "unaligned", TQ_unalignedLoc);
 436 }
 437
 438 void DeclSpec::forEachQualifier(
 439     llvm::function_ref<void(TQ, StringRef, SourceLocation)> Handle) {
 440   forEachCVRUQualifier(Handle);
 441   // FIXME: Add code below to iterate through the attributes and call Handle.
 442 }
 443
 444 bool DeclSpec::hasTagDefinition() const {
 445   if (!TypeSpecOwned)
 446     return false;
 447   return cast<TagDecl>(getRepAsDecl())->isCompleteDefinition();
 448 }
 449
 450 /// getParsedSpecifiers - Return a bitmask of which flavors of specifiers this
 451 /// declaration specifier includes.
 452 ///
 453 unsigned DeclSpec::getParsedSpecifiers() const {
 454   unsigned Res = 0;
 455   if (StorageClassSpec != SCS_unspecified ||
 456       ThreadStorageClassSpec != TSCS_unspecified)
 457     Res |= PQ_StorageClassSpecifier;
 458
 459   if (TypeQualifiers != TQ_unspecified)
 460     Res |= PQ_TypeQualifier;
 461
 462   if (hasTypeSpecifier())
 463     Res |= PQ_TypeSpecifier;
 464
 465   if (FS_inline_specified || FS_virtual_specified || hasExplicitSpecifier() ||
 466       FS_noreturn_specified || FS_forceinline_specified)
 467     Res |= PQ_FunctionSpecifier;
 468   return Res;
 469 }
 470
 471 template <class T> static bool BadSpecifier(T TNew, T TPrev,
 472                                             const char *&PrevSpec,
 473                                             unsigned &DiagID,
 474                                             bool IsExtension = true) {
 475   PrevSpec = DeclSpec::getSpecifierName(TPrev);
 476   if (TNew != TPrev)
 477     DiagID = diag::err_invalid_decl_spec_combination;
 478   else
 479     DiagID = IsExtension ? diag::ext_warn_duplicate_declspec :
 480                            diag::warn_duplicate_declspec;
 481   return true;
 482 }
 483
 484 const char *DeclSpec::getSpecifierName(DeclSpec::SCS S) {
 485   switch (S) {
 486   case DeclSpec::SCS_unspecified: return "unspecified";
 487   case DeclSpec::SCS_typedef:     return "typedef";
 488   case DeclSpec::SCS_extern:      return "extern";
 489   case DeclSpec::SCS_static:      return "static";
 490   case DeclSpec::SCS_auto:        return "auto";
 491   case DeclSpec::SCS_register:    return "register";
 492   case DeclSpec::SCS_private_extern: return "__private_extern__";
 493   case DeclSpec::SCS_mutable:     return "mutable";
 494   }
 495   llvm_unreachable("Unknown typespec!");
 496 }
 497
 498 const char *DeclSpec::getSpecifierName(DeclSpec::TSCS S) {
 499   switch (S) {
 500   case DeclSpec::TSCS_unspecified:   return "unspecified";
 501   case DeclSpec::TSCS___thread:      return "__thread";
 502   case DeclSpec::TSCS_thread_local:  return "thread_local";
 503   case DeclSpec::TSCS__Thread_local: return "_Thread_local";
 504   }
 505   llvm_unreachable("Unknown typespec!");
 506 }
 507
 508 const char *DeclSpec::getSpecifierName(TypeSpecifierWidth W) {
 509   switch (W) {
 510   case TypeSpecifierWidth::Unspecified:
 511     return "unspecified";
 512   case TypeSpecifierWidth::Short:
 513     return "short";
 514   case TypeSpecifierWidth::Long:
 515     return "long";
 516   case TypeSpecifierWidth::LongLong:
 517     return "long long";
 518   }
 519   llvm_unreachable("Unknown typespec!");
 520 }
 521
 522 const char *DeclSpec::getSpecifierName(TSC C) {
 523   switch (C) {
 524   case TSC_unspecified: return "unspecified";
 525   case TSC_imaginary:   return "imaginary";
 526   case TSC_complex:     return "complex";
 527   }
 528   llvm_unreachable("Unknown typespec!");
 529 }
 530
 531 const char *DeclSpec::getSpecifierName(TypeSpecifierSign S) {
 532   switch (S) {
 533   case TypeSpecifierSign::Unspecified:
 534     return "unspecified";
 535   case TypeSpecifierSign::Signed:
 536     return "signed";
 537   case TypeSpecifierSign::Unsigned:
 538     return "unsigned";
 539   }
 540   llvm_unreachable("Unknown typespec!");
 541 }
 542
 543 const char *DeclSpec::getSpecifierName(DeclSpec::TST T,
 544                                        const PrintingPolicy &Policy) {
 545   switch (T) {
 546   case DeclSpec::TST_unspecified: return "unspecified";
 547   case DeclSpec::TST_void:        return "void";
 548   case DeclSpec::TST_char:        return "char";
 549   case DeclSpec::TST_wchar:       return Policy.MSWChar ? "__wchar_t" : "wchar_t";
 550   case DeclSpec::TST_char8:       return "char8_t";
 551   case DeclSpec::TST_char16:      return "char16_t";
 552   case DeclSpec::TST_char32:      return "char32_t";
 553   case DeclSpec::TST_int:         return "int";
 554   case DeclSpec::TST_int128:      return "__int128";
 555   case DeclSpec::TST_bitint:      return "_BitInt";
 556   case DeclSpec::TST_half:        return "half";
 557   case DeclSpec::TST_float:       return "float";
 558   case DeclSpec::TST_double:      return "double";
 559   case DeclSpec::TST_accum:       return "_Accum";
 560   case DeclSpec::TST_fract:       return "_Fract";
 561   case DeclSpec::TST_float16:     return "_Float16";
 562   case DeclSpec::TST_float128:    return "__float128";
 563   case DeclSpec::TST_ibm128:      return "__ibm128";
 564   case DeclSpec::TST_bool:        return Policy.Bool ? "bool" : "_Bool";
 565   case DeclSpec::TST_decimal32:   return "_Decimal32";
 566   case DeclSpec::TST_decimal64:   return "_Decimal64";
 567   case DeclSpec::TST_decimal128:  return "_Decimal128";
 568   case DeclSpec::TST_enum:        return "enum";
 569   case DeclSpec::TST_class:       return "class";
 570   case DeclSpec::TST_union:       return "union";
 571   case DeclSpec::TST_struct:      return "struct";
 572   case DeclSpec::TST_interface:   return "__interface";
 573   case DeclSpec::TST_typename:    return "type-name";
 574   case DeclSpec::TST_typeofType:
 575   case DeclSpec::TST_typeofExpr:  return "typeof";
 576   case DeclSpec::TST_auto:        return "auto";
 577   case DeclSpec::TST_auto_type:   return "__auto_type";
 578   case DeclSpec::TST_decltype:    return "(decltype)";
 579   case DeclSpec::TST_decltype_auto: return "decltype(auto)";
 580 #define TRANSFORM_TYPE_TRAIT_DEF(_, Trait)                                     \
 581   case DeclSpec::TST_##Trait:                                                  \
 582     return "__" #Trait;
 583 #include "clang/Basic/TransformTypeTraits.def"
 584   case DeclSpec::TST_unknown_anytype: return "__unknown_anytype";
 585   case DeclSpec::TST_atomic: return "_Atomic";
 586   case DeclSpec::TST_BFloat16: return "__bf16";
 587 #define GENERIC_IMAGE_TYPE(ImgType, Id) \
 588   case DeclSpec::TST_##ImgType##_t: \
 589     return #ImgType "_t";
 590 #include "clang/Basic/OpenCLImageTypes.def"
 591   case DeclSpec::TST_error:       return "(error)";
 592   }
 593   llvm_unreachable("Unknown typespec!");
 594 }
 595
 596 const char *DeclSpec::getSpecifierName(ConstexprSpecKind C) {
 597   switch (C) {
 598   case ConstexprSpecKind::Unspecified:
 599     return "unspecified";
 600   case ConstexprSpecKind::Constexpr:
 601     return "constexpr";
 602   case ConstexprSpecKind::Consteval:
 603     return "consteval";
 604   case ConstexprSpecKind::Constinit:
 605     return "constinit";
 606   }
 607   llvm_unreachable("Unknown ConstexprSpecKind");
 608 }
 609
 610 const char *DeclSpec::getSpecifierName(TQ T) {
 611   switch (T) {
 612   case DeclSpec::TQ_unspecified: return "unspecified";
 613   case DeclSpec::TQ_const:       return "const";
 614   case DeclSpec::TQ_restrict:    return "restrict";
 615   case DeclSpec::TQ_volatile:    return "volatile";
 616   case DeclSpec::TQ_atomic:      return "_Atomic";
 617   case DeclSpec::TQ_unaligned:   return "__unaligned";
 618   }
 619   llvm_unreachable("Unknown typespec!");
 620 }
 621
 622 bool DeclSpec::SetStorageClassSpec(Sema &S, SCS SC, SourceLocation Loc,
 623                                    const char *&PrevSpec,
 624                                    unsigned &DiagID,
 625                                    const PrintingPolicy &Policy) {
 626   // OpenCL v1.1 s6.8g: "The extern, static, auto and register storage-class
 627   // specifiers are not supported.
 628   // It seems sensible to prohibit private_extern too
 629   // The cl_clang_storage_class_specifiers extension enables support for
 630   // these storage-class specifiers.
 631   // OpenCL v1.2 s6.8 changes this to "The auto and register storage-class
 632   // specifiers are not supported."
 633   if (S.getLangOpts().OpenCL &&
 634       !S.getOpenCLOptions().isAvailableOption(
 635           "cl_clang_storage_class_specifiers", S.getLangOpts())) {
 636     switch (SC) {
 637     case SCS_extern:
 638     case SCS_private_extern:
 639     case SCS_static:
 640       if (S.getLangOpts().getOpenCLCompatibleVersion() < 120) {
 641         DiagID = diag::err_opencl_unknown_type_specifier;
 642         PrevSpec = getSpecifierName(SC);
 643         return true;
 644       }
 645       break;
 646     case SCS_auto:
 647     case SCS_register:
 648       DiagID   = diag::err_opencl_unknown_type_specifier;
 649       PrevSpec = getSpecifierName(SC);
 650       return true;
 651     default:
 652       break;
 653     }
 654   }
 655
 656   if (StorageClassSpec != SCS_unspecified) {
 657     // Maybe this is an attempt to use C++11 'auto' outside of C++11 mode.
 658     bool isInvalid = true;
 659     if (TypeSpecType == TST_unspecified && S.getLangOpts().CPlusPlus) {
 660       if (SC == SCS_auto)
 661         return SetTypeSpecType(TST_auto, Loc, PrevSpec, DiagID, Policy);
 662       if (StorageClassSpec == SCS_auto) {
 663         isInvalid = SetTypeSpecType(TST_auto, StorageClassSpecLoc,
 664                                     PrevSpec, DiagID, Policy);
 665         assert(!isInvalid && "auto SCS -> TST recovery failed");
 666       }
 667     }
 668
 669     // Changing storage class is allowed only if the previous one
 670     // was the 'extern' that is part of a linkage specification and
 671     // the new storage class is 'typedef'.
 672     if (isInvalid &&
 673         !(SCS_extern_in_linkage_spec &&
 674           StorageClassSpec == SCS_extern &&
 675           SC == SCS_typedef))
 676       return BadSpecifier(SC, (SCS)StorageClassSpec, PrevSpec, DiagID);
 677   }
 678   StorageClassSpec = SC;
 679   StorageClassSpecLoc = Loc;
 680   assert((unsigned)SC == StorageClassSpec && "SCS constants overflow bitfield");
 681   return false;
 682 }
 683
 684 bool DeclSpec::SetStorageClassSpecThread(TSCS TSC, SourceLocation Loc,
 685                                          const char *&PrevSpec,
 686                                          unsigned &DiagID) {
 687   if (ThreadStorageClassSpec != TSCS_unspecified)
 688     return BadSpecifier(TSC, (TSCS)ThreadStorageClassSpec, PrevSpec, DiagID);
 689
 690   ThreadStorageClassSpec = TSC;
 691   ThreadStorageClassSpecLoc = Loc;
 692   return false;
 693 }
 694
 695 /// These methods set the specified attribute of the DeclSpec, but return true
 696 /// and ignore the request if invalid (e.g. "extern" then "auto" is
 697 /// specified).
 698 bool DeclSpec::SetTypeSpecWidth(TypeSpecifierWidth W, SourceLocation Loc,
 699                                 const char *&PrevSpec, unsigned &DiagID,
 700                                 const PrintingPolicy &Policy) {
 701   // Overwrite TSWRange.Begin only if TypeSpecWidth was unspecified, so that
 702   // for 'long long' we will keep the source location of the first 'long'.
 703   if (getTypeSpecWidth() == TypeSpecifierWidth::Unspecified)
 704     TSWRange.setBegin(Loc);
 705   // Allow turning long -> long long.
 706   else if (W != TypeSpecifierWidth::LongLong ||
 707            getTypeSpecWidth() != TypeSpecifierWidth::Long)
 708     return BadSpecifier(W, getTypeSpecWidth(), PrevSpec, DiagID);
 709   TypeSpecWidth = static_cast<unsigned>(W);
 710   // Remember location of the last 'long'
 711   TSWRange.setEnd(Loc);
 712   return false;
 713 }
 714
 715 bool DeclSpec::SetTypeSpecComplex(TSC C, SourceLocation Loc,
 716                                   const char *&PrevSpec,
 717                                   unsigned &DiagID) {
 718   if (TypeSpecComplex != TSC_unspecified)
 719     return BadSpecifier(C, (TSC)TypeSpecComplex, PrevSpec, DiagID);
 720   TypeSpecComplex = C;
 721   TSCLoc = Loc;
 722   return false;
 723 }
 724
 725 bool DeclSpec::SetTypeSpecSign(TypeSpecifierSign S, SourceLocation Loc,
 726                                const char *&PrevSpec, unsigned &DiagID) {
 727   if (getTypeSpecSign() != TypeSpecifierSign::Unspecified)
 728     return BadSpecifier(S, getTypeSpecSign(), PrevSpec, DiagID);
 729   TypeSpecSign = static_cast<unsigned>(S);
 730   TSSLoc = Loc;
 731   return false;
 732 }
 733
 734 bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
 735                                const char *&PrevSpec,
 736                                unsigned &DiagID,
 737                                ParsedType Rep,
 738                                const PrintingPolicy &Policy) {
 739   return SetTypeSpecType(T, Loc, Loc, PrevSpec, DiagID, Rep, Policy);
 740 }
 741
 742 bool DeclSpec::SetTypeSpecType(TST T, SourceLocation TagKwLoc,
 743                                SourceLocation TagNameLoc,
 744                                const char *&PrevSpec,
 745                                unsigned &DiagID,
 746                                ParsedType Rep,
 747                                const PrintingPolicy &Policy) {
 748   assert(isTypeRep(T) && "T does not store a type");
 749   assert(Rep && "no type provided!");
 750   if (TypeSpecType == TST_error)
 751     return false;
 752   if (TypeSpecType != TST_unspecified) {
 753     PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType, Policy);
 754     DiagID = diag::err_invalid_decl_spec_combination;
 755     return true;
 756   }
 757   TypeSpecType = T;
 758   TypeRep = Rep;
 759   TSTLoc = TagKwLoc;
 760   TSTNameLoc = TagNameLoc;
 761   TypeSpecOwned = false;
 762   return false;
 763 }
 764
 765 bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
 766                                const char *&PrevSpec,
 767                                unsigned &DiagID,
 768                                Expr *Rep,
 769                                const PrintingPolicy &Policy) {
 770   assert(isExprRep(T) && "T does not store an expr");
 771   assert(Rep && "no expression provided!");
 772   if (TypeSpecType == TST_error)
 773     return false;
 774   if (TypeSpecType != TST_unspecified) {
 775     PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType, Policy);
 776     DiagID = diag::err_invalid_decl_spec_combination;
 777     return true;
 778   }
 779   TypeSpecType = T;
 780   ExprRep = Rep;
 781   TSTLoc = Loc;
 782   TSTNameLoc = Loc;
 783   TypeSpecOwned = false;
 784   return false;
 785 }
 786
 787 bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
 788                                const char *&PrevSpec,
 789                                unsigned &DiagID,
 790                                Decl *Rep, bool Owned,
 791                                const PrintingPolicy &Policy) {
 792   return SetTypeSpecType(T, Loc, Loc, PrevSpec, DiagID, Rep, Owned, Policy);
 793 }
 794
 795 bool DeclSpec::SetTypeSpecType(TST T, SourceLocation TagKwLoc,
 796                                SourceLocation TagNameLoc,
 797                                const char *&PrevSpec,
 798                                unsigned &DiagID,
 799                                Decl *Rep, bool Owned,
 800                                const PrintingPolicy &Policy) {
 801   assert(isDeclRep(T) && "T does not store a decl");
 802   // Unlike the other cases, we don't assert that we actually get a decl.
 803
 804   if (TypeSpecType == TST_error)
 805     return false;
 806   if (TypeSpecType != TST_unspecified) {
 807     PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType, Policy);
 808     DiagID = diag::err_invalid_decl_spec_combination;
 809     return true;
 810   }
 811   TypeSpecType = T;
 812   DeclRep = Rep;
 813   TSTLoc = TagKwLoc;
 814   TSTNameLoc = TagNameLoc;
 815   TypeSpecOwned = Owned && Rep != nullptr;
 816   return false;
 817 }
 818
 819 bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc, const char *&PrevSpec,
 820                                unsigned &DiagID, TemplateIdAnnotation *Rep,
 821                                const PrintingPolicy &Policy) {
 822   assert(T == TST_auto || T == TST_decltype_auto);
 823   ConstrainedAuto = true;
 824   TemplateIdRep = Rep;
 825   return SetTypeSpecType(T, Loc, PrevSpec, DiagID, Policy);
 826 }
 827
 828 bool DeclSpec::SetTypeSpecType(TST T, SourceLocation Loc,
 829                                const char *&PrevSpec,
 830                                unsigned &DiagID,
 831                                const PrintingPolicy &Policy) {
 832   assert(!isDeclRep(T) && !isTypeRep(T) && !isExprRep(T) &&
 833          "rep required for these type-spec kinds!");
 834   if (TypeSpecType == TST_error)
 835     return false;
 836   if (TypeSpecType != TST_unspecified) {
 837     PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType, Policy);
 838     DiagID = diag::err_invalid_decl_spec_combination;
 839     return true;
 840   }
 841   TSTLoc = Loc;
 842   TSTNameLoc = Loc;
 843   if (TypeAltiVecVector && (T == TST_bool) && !TypeAltiVecBool) {
 844     TypeAltiVecBool = true;
 845     return false;
 846   }
 847   TypeSpecType = T;
 848   TypeSpecOwned = false;
 849   return false;
 850 }
 851
 852 bool DeclSpec::SetTypeSpecSat(SourceLocation Loc, const char *&PrevSpec,
 853                               unsigned &DiagID) {
 854   // Cannot set twice
 855   if (TypeSpecSat) {
 856     DiagID = diag::warn_duplicate_declspec;
 857     PrevSpec = "_Sat";
 858     return true;
 859   }
 860   TypeSpecSat = true;
 861   TSSatLoc = Loc;
 862   return false;
 863 }
 864
 865 bool DeclSpec::SetTypeAltiVecVector(bool isAltiVecVector, SourceLocation Loc,
 866                           const char *&PrevSpec, unsigned &DiagID,
 867                           const PrintingPolicy &Policy) {
 868   if (TypeSpecType == TST_error)
 869     return false;
 870   if (TypeSpecType != TST_unspecified) {
 871     PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType, Policy);
 872     DiagID = diag::err_invalid_vector_decl_spec_combination;
 873     return true;
 874   }
 875   TypeAltiVecVector = isAltiVecVector;
 876   AltiVecLoc = Loc;
 877   return false;
 878 }
 879
 880 bool DeclSpec::SetTypePipe(bool isPipe, SourceLocation Loc,
 881                            const char *&PrevSpec, unsigned &DiagID,
 882                            const PrintingPolicy &Policy) {
 883   if (TypeSpecType == TST_error)
 884     return false;
 885   if (TypeSpecType != TST_unspecified) {
 886     PrevSpec = DeclSpec::getSpecifierName((TST)TypeSpecType, Policy);
 887     DiagID = diag::err_invalid_decl_spec_combination;
 888     return true;
 889   }
 890
 891   if (isPipe) {
 892     TypeSpecPipe = static_cast<unsigned>(TypeSpecifiersPipe::Pipe);
 893   }
 894   return false;
 895 }
 896
 897 bool DeclSpec::SetTypeAltiVecPixel(bool isAltiVecPixel, SourceLocation Loc,
 898                           const char *&PrevSpec, unsigned &DiagID,
 899                           const PrintingPolicy &Policy) {
 900   if (TypeSpecType == TST_error)
 901     return false;
 902   if (!TypeAltiVecVector || TypeAltiVecPixel ||
 903       (TypeSpecType != TST_unspecified)) {
 904     PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType, Policy);
 905     DiagID = diag::err_invalid_pixel_decl_spec_combination;
 906     return true;
 907   }
 908   TypeAltiVecPixel = isAltiVecPixel;
 909   TSTLoc = Loc;
 910   TSTNameLoc = Loc;
 911   return false;
 912 }
 913
 914 bool DeclSpec::SetTypeAltiVecBool(bool isAltiVecBool, SourceLocation Loc,
 915                                   const char *&PrevSpec, unsigned &DiagID,
 916                                   const PrintingPolicy &Policy) {
 917   if (TypeSpecType == TST_error)
 918     return false;
 919   if (!TypeAltiVecVector || TypeAltiVecBool ||
 920       (TypeSpecType != TST_unspecified)) {
 921     PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType, Policy);
 922     DiagID = diag::err_invalid_vector_bool_decl_spec;
 923     return true;
 924   }
 925   TypeAltiVecBool = isAltiVecBool;
 926   TSTLoc = Loc;
 927   TSTNameLoc = Loc;
 928   return false;
 929 }
 930
 931 bool DeclSpec::SetTypeSpecError() {
 932   TypeSpecType = TST_error;
 933   TypeSpecOwned = false;
 934   TSTLoc = SourceLocation();
 935   TSTNameLoc = SourceLocation();
 936   return false;
 937 }
 938
 939 bool DeclSpec::SetBitIntType(SourceLocation KWLoc, Expr *BitsExpr,
 940                              const char *&PrevSpec, unsigned &DiagID,
 941                              const PrintingPolicy &Policy) {
 942   assert(BitsExpr && "no expression provided!");
 943   if (TypeSpecType == TST_error)
 944     return false;
 945
 946   if (TypeSpecType != TST_unspecified) {
 947     PrevSpec = DeclSpec::getSpecifierName((TST) TypeSpecType, Policy);
 948     DiagID = diag::err_invalid_decl_spec_combination;
 949     return true;
 950   }
 951
 952   TypeSpecType = TST_bitint;
 953   ExprRep = BitsExpr;
 954   TSTLoc = KWLoc;
 955   TSTNameLoc = KWLoc;
 956   TypeSpecOwned = false;
 957   return false;
 958 }
 959
 960 bool DeclSpec::SetTypeQual(TQ T, SourceLocation Loc, const char *&PrevSpec,
 961                            unsigned &DiagID, const LangOptions &Lang) {
 962   // Duplicates are permitted in C99 onwards, but are not permitted in C89 or
 963   // C++.  However, since this is likely not what the user intended, we will
 964   // always warn.  We do not need to set the qualifier's location since we
 965   // already have it.
 966   if (TypeQualifiers & T) {
 967     bool IsExtension = true;
 968     if (Lang.C99)
 969       IsExtension = false;
 970     return BadSpecifier(T, T, PrevSpec, DiagID, IsExtension);
 971   }
 972
 973   return SetTypeQual(T, Loc);
 974 }
 975
 976 bool DeclSpec::SetTypeQual(TQ T, SourceLocation Loc) {
 977   TypeQualifiers |= T;
 978
 979   switch (T) {
 980   case TQ_unspecified: break;
 981   case TQ_const:    TQ_constLoc = Loc; return false;
 982   case TQ_restrict: TQ_restrictLoc = Loc; return false;
 983   case TQ_volatile: TQ_volatileLoc = Loc; return false;
 984   case TQ_unaligned: TQ_unalignedLoc = Loc; return false;
 985   case TQ_atomic:   TQ_atomicLoc = Loc; return false;
 986   }
 987
 988   llvm_unreachable("Unknown type qualifier!");
 989 }
 990
 991 bool DeclSpec::setFunctionSpecInline(SourceLocation Loc, const char *&PrevSpec,
 992                                      unsigned &DiagID) {
 993   // 'inline inline' is ok.  However, since this is likely not what the user
 994   // intended, we will always warn, similar to duplicates of type qualifiers.
 995   if (FS_inline_specified) {
 996     DiagID = diag::warn_duplicate_declspec;
 997     PrevSpec = "inline";
 998     return true;
 999   }
1000   FS_inline_specified = true;
1001   FS_inlineLoc = Loc;
1002   return false;
1003 }
1004
1005 bool DeclSpec::setFunctionSpecForceInline(SourceLocation Loc, const char *&PrevSpec,
1006                                           unsigned &DiagID) {
1007   if (FS_forceinline_specified) {
1008     DiagID = diag::warn_duplicate_declspec;
1009     PrevSpec = "__forceinline";
1010     return true;
1011   }
1012   FS_forceinline_specified = true;
1013   FS_forceinlineLoc = Loc;
1014   return false;
1015 }
1016
1017 bool DeclSpec::setFunctionSpecVirtual(SourceLocation Loc,
1018                                       const char *&PrevSpec,
1019                                       unsigned &DiagID) {
1020   // 'virtual virtual' is ok, but warn as this is likely not what the user
1021   // intended.
1022   if (FS_virtual_specified) {
1023     DiagID = diag::warn_duplicate_declspec;
1024     PrevSpec = "virtual";
1025     return true;
1026   }
1027   FS_virtual_specified = true;
1028   FS_virtualLoc = Loc;
1029   return false;
1030 }
1031
1032 bool DeclSpec::setFunctionSpecExplicit(SourceLocation Loc,
1033                                        const char *&PrevSpec, unsigned &DiagID,
1034                                        ExplicitSpecifier ExplicitSpec,
1035                                        SourceLocation CloseParenLoc) {
1036   // 'explicit explicit' is ok, but warn as this is likely not what the user
1037   // intended.
1038   if (hasExplicitSpecifier()) {
1039     DiagID = (ExplicitSpec.getExpr() || FS_explicit_specifier.getExpr())
1040                  ? diag::err_duplicate_declspec
1041                  : diag::ext_warn_duplicate_declspec;
1042     PrevSpec = "explicit";
1043     return true;
1044   }
1045   FS_explicit_specifier = ExplicitSpec;
1046   FS_explicitLoc = Loc;
1047   FS_explicitCloseParenLoc = CloseParenLoc;
1048   return false;
1049 }
1050
1051 bool DeclSpec::setFunctionSpecNoreturn(SourceLocation Loc,
1052                                        const char *&PrevSpec,
1053                                        unsigned &DiagID) {
1054   // '_Noreturn _Noreturn' is ok, but warn as this is likely not what the user
1055   // intended.
1056   if (FS_noreturn_specified) {
1057     DiagID = diag::warn_duplicate_declspec;
1058     PrevSpec = "_Noreturn";
1059     return true;
1060   }
1061   FS_noreturn_specified = true;
1062   FS_noreturnLoc = Loc;
1063   return false;
1064 }
1065
1066 bool DeclSpec::SetFriendSpec(SourceLocation Loc, const char *&PrevSpec,
1067                              unsigned &DiagID) {
1068   if (Friend_specified) {
1069     PrevSpec = "friend";
1070     // Keep the later location, so that we can later diagnose ill-formed
1071     // declarations like 'friend class X friend;'. Per [class.friend]p3,
1072     // 'friend' must be the first token in a friend declaration that is
1073     // not a function declaration.
1074     FriendLoc = Loc;
1075     DiagID = diag::warn_duplicate_declspec;
1076     return true;
1077   }
1078
1079   Friend_specified = true;
1080   FriendLoc = Loc;
1081   return false;
1082 }
1083
1084 bool DeclSpec::setModulePrivateSpec(SourceLocation Loc, const char *&PrevSpec,
1085                                     unsigned &DiagID) {
1086   if (isModulePrivateSpecified()) {
1087     PrevSpec = "__module_private__";
1088     DiagID = diag::ext_warn_duplicate_declspec;
1089     return true;
1090   }
1091
1092   ModulePrivateLoc = Loc;
1093   return false;
1094 }
1095
1096 bool DeclSpec::SetConstexprSpec(ConstexprSpecKind ConstexprKind,
1097                                 SourceLocation Loc, const char *&PrevSpec,
1098                                 unsigned &DiagID) {
1099   if (getConstexprSpecifier() != ConstexprSpecKind::Unspecified)
1100     return BadSpecifier(ConstexprKind, getConstexprSpecifier(), PrevSpec,
1101                         DiagID);
1102   ConstexprSpecifier = static_cast<unsigned>(ConstexprKind);
1103   ConstexprLoc = Loc;
1104   return false;
1105 }
1106
1107 void DeclSpec::SaveWrittenBuiltinSpecs() {
1108   writtenBS.Sign = static_cast<int>(getTypeSpecSign());
1109   writtenBS.Width = static_cast<int>(getTypeSpecWidth());
1110   writtenBS.Type = getTypeSpecType();
1111   // Search the list of attributes for the presence of a mode attribute.
1112   writtenBS.ModeAttr = getAttributes().hasAttribute(ParsedAttr::AT_Mode);
1113 }
1114
1115 /// Finish - This does final analysis of the declspec, rejecting things like
1116 /// "_Imaginary" (lacking an FP type).  This returns a diagnostic to issue or
1117 /// diag::NUM_DIAGNOSTICS if there is no error.  After calling this method,
1118 /// DeclSpec is guaranteed self-consistent, even if an error occurred.
1119 void DeclSpec::Finish(Sema &S, const PrintingPolicy &Policy) {
1120   // Before possibly changing their values, save specs as written.
1121   SaveWrittenBuiltinSpecs();
1122
1123   // Check the type specifier components first. No checking for an invalid
1124   // type.
1125   if (TypeSpecType == TST_error)
1126     return;
1127
1128   // If decltype(auto) is used, no other type specifiers are permitted.
1129   if (TypeSpecType == TST_decltype_auto &&
1130       (getTypeSpecWidth() != TypeSpecifierWidth::Unspecified ||
1131        TypeSpecComplex != TSC_unspecified ||
1132        getTypeSpecSign() != TypeSpecifierSign::Unspecified ||
1133        TypeAltiVecVector || TypeAltiVecPixel || TypeAltiVecBool ||
1134        TypeQualifiers)) {
1135     const unsigned NumLocs = 9;
1136     SourceLocation ExtraLocs[NumLocs] = {
1137         TSWRange.getBegin(), TSCLoc,       TSSLoc,
1138         AltiVecLoc,          TQ_constLoc,  TQ_restrictLoc,
1139         TQ_volatileLoc,      TQ_atomicLoc, TQ_unalignedLoc};
1140     FixItHint Hints[NumLocs];
1141     SourceLocation FirstLoc;
1142     for (unsigned I = 0; I != NumLocs; ++I) {
1143       if (ExtraLocs[I].isValid()) {
1144         if (FirstLoc.isInvalid() ||
1145             S.getSourceManager().isBeforeInTranslationUnit(ExtraLocs[I],
1146                                                            FirstLoc))
1147           FirstLoc = ExtraLocs[I];
1148         Hints[I] = FixItHint::CreateRemoval(ExtraLocs[I]);
1149       }
1150     }
1151     TypeSpecWidth = static_cast<unsigned>(TypeSpecifierWidth::Unspecified);
1152     TypeSpecComplex = TSC_unspecified;
1153     TypeSpecSign = static_cast<unsigned>(TypeSpecifierSign::Unspecified);
1154     TypeAltiVecVector = TypeAltiVecPixel = TypeAltiVecBool = false;
1155     TypeQualifiers = 0;
1156     S.Diag(TSTLoc, diag::err_decltype_auto_cannot_be_combined)
1157       << Hints[0] << Hints[1] << Hints[2] << Hints[3]
1158       << Hints[4] << Hints[5] << Hints[6] << Hints[7];
1159   }
1160
1161   // Validate and finalize AltiVec vector declspec.
1162   if (TypeAltiVecVector) {
1163     // No vector long long without VSX (or ZVector).
1164     if ((getTypeSpecWidth() == TypeSpecifierWidth::LongLong) &&
1165         !S.Context.getTargetInfo().hasFeature("vsx") &&
1166         !S.getLangOpts().ZVector)
1167       S.Diag(TSWRange.getBegin(), diag::err_invalid_vector_long_long_decl_spec);
1168
1169     // No vector __int128 prior to Power8.
1170     if ((TypeSpecType == TST_int128) &&
1171         !S.Context.getTargetInfo().hasFeature("power8-vector"))
1172       S.Diag(TSTLoc, diag::err_invalid_vector_int128_decl_spec);
1173
1174     if (TypeAltiVecBool) {
1175       // Sign specifiers are not allowed with vector bool. (PIM 2.1)
1176       if (getTypeSpecSign() != TypeSpecifierSign::Unspecified) {
1177         S.Diag(TSSLoc, diag::err_invalid_vector_bool_decl_spec)
1178             << getSpecifierName(getTypeSpecSign());
1179       }
1180       // Only char/int are valid with vector bool prior to Power10.
1181       // Power10 adds instructions that produce vector bool data
1182       // for quadwords as well so allow vector bool __int128.
1183       if (((TypeSpecType != TST_unspecified) && (TypeSpecType != TST_char) &&
1184            (TypeSpecType != TST_int) && (TypeSpecType != TST_int128)) ||
1185           TypeAltiVecPixel) {
1186         S.Diag(TSTLoc, diag::err_invalid_vector_bool_decl_spec)
1187           << (TypeAltiVecPixel ? "__pixel" :
1188                                  getSpecifierName((TST)TypeSpecType, Policy));
1189       }
1190       // vector bool __int128 requires Power10.
1191       if ((TypeSpecType == TST_int128) &&
1192           (!S.Context.getTargetInfo().hasFeature("power10-vector")))
1193         S.Diag(TSTLoc, diag::err_invalid_vector_bool_int128_decl_spec);
1194
1195       // Only 'short' and 'long long' are valid with vector bool. (PIM 2.1)
1196       if ((getTypeSpecWidth() != TypeSpecifierWidth::Unspecified) &&
1197           (getTypeSpecWidth() != TypeSpecifierWidth::Short) &&
1198           (getTypeSpecWidth() != TypeSpecifierWidth::LongLong))
1199         S.Diag(TSWRange.getBegin(), diag::err_invalid_vector_bool_decl_spec)
1200             << getSpecifierName(getTypeSpecWidth());
1201
1202       // Elements of vector bool are interpreted as unsigned. (PIM 2.1)
1203       if ((TypeSpecType == TST_char) || (TypeSpecType == TST_int) ||
1204           (TypeSpecType == TST_int128) ||
1205           (getTypeSpecWidth() != TypeSpecifierWidth::Unspecified))
1206         TypeSpecSign = static_cast<unsigned>(TypeSpecifierSign::Unsigned);
1207     } else if (TypeSpecType == TST_double) {
1208       // vector long double and vector long long double are never allowed.
1209       // vector double is OK for Power7 and later, and ZVector.
1210       if (getTypeSpecWidth() == TypeSpecifierWidth::Long ||
1211           getTypeSpecWidth() == TypeSpecifierWidth::LongLong)
1212         S.Diag(TSWRange.getBegin(),
1213                diag::err_invalid_vector_long_double_decl_spec);
1214       else if (!S.Context.getTargetInfo().hasFeature("vsx") &&
1215                !S.getLangOpts().ZVector)
1216         S.Diag(TSTLoc, diag::err_invalid_vector_double_decl_spec);
1217     } else if (TypeSpecType == TST_float) {
1218       // vector float is unsupported for ZVector unless we have the
1219       // vector-enhancements facility 1 (ISA revision 12).
1220       if (S.getLangOpts().ZVector &&
1221           !S.Context.getTargetInfo().hasFeature("arch12"))
1222         S.Diag(TSTLoc, diag::err_invalid_vector_float_decl_spec);
1223     } else if (getTypeSpecWidth() == TypeSpecifierWidth::Long) {
1224       // Vector long is unsupported for ZVector, or without VSX, and deprecated
1225       // for AltiVec.
1226       // It has also been historically deprecated on AIX (as an alias for
1227       // "vector int" in both 32-bit and 64-bit modes). It was then made
1228       // unsupported in the Clang-based XL compiler since the deprecated type
1229       // has a number of conflicting semantics and continuing to support it
1230       // is a disservice to users.
1231       if (S.getLangOpts().ZVector ||
1232           !S.Context.getTargetInfo().hasFeature("vsx") ||
1233           S.Context.getTargetInfo().getTriple().isOSAIX())
1234         S.Diag(TSWRange.getBegin(), diag::err_invalid_vector_long_decl_spec);
1235       else
1236         S.Diag(TSWRange.getBegin(),
1237                diag::warn_vector_long_decl_spec_combination)
1238             << getSpecifierName((TST)TypeSpecType, Policy);
1239     }
1240
1241     if (TypeAltiVecPixel) {
1242       //TODO: perform validation
1243       TypeSpecType = TST_int;
1244       TypeSpecSign = static_cast<unsigned>(TypeSpecifierSign::Unsigned);
1245       TypeSpecWidth = static_cast<unsigned>(TypeSpecifierWidth::Short);
1246       TypeSpecOwned = false;
1247     }
1248   }
1249
1250   bool IsFixedPointType =
1251       TypeSpecType == TST_accum || TypeSpecType == TST_fract;
1252
1253   // signed/unsigned are only valid with int/char/wchar_t/_Accum.
1254   if (getTypeSpecSign() != TypeSpecifierSign::Unspecified) {
1255     if (TypeSpecType == TST_unspecified)
1256       TypeSpecType = TST_int; // unsigned -> unsigned int, signed -> signed int.
1257     else if (TypeSpecType != TST_int && TypeSpecType != TST_int128 &&
1258              TypeSpecType != TST_char && TypeSpecType != TST_wchar &&
1259              !IsFixedPointType && TypeSpecType != TST_bitint) {
1260       S.Diag(TSSLoc, diag::err_invalid_sign_spec)
1261         << getSpecifierName((TST)TypeSpecType, Policy);
1262       // signed double -> double.
1263       TypeSpecSign = static_cast<unsigned>(TypeSpecifierSign::Unspecified);
1264     }
1265   }
1266
1267   // Validate the width of the type.
1268   switch (getTypeSpecWidth()) {
1269   case TypeSpecifierWidth::Unspecified:
1270     break;
1271   case TypeSpecifierWidth::Short:    // short int
1272   case TypeSpecifierWidth::LongLong: // long long int
1273     if (TypeSpecType == TST_unspecified)
1274       TypeSpecType = TST_int; // short -> short int, long long -> long long int.
1275     else if (!(TypeSpecType == TST_int ||
1276                (IsFixedPointType &&
1277                 getTypeSpecWidth() != TypeSpecifierWidth::LongLong))) {
1278       S.Diag(TSWRange.getBegin(), diag::err_invalid_width_spec)
1279           << (int)TypeSpecWidth << getSpecifierName((TST)TypeSpecType, Policy);
1280       TypeSpecType = TST_int;
1281       TypeSpecSat = false;
1282       TypeSpecOwned = false;
1283     }
1284     break;
1285   case TypeSpecifierWidth::Long: // long double, long int
1286     if (TypeSpecType == TST_unspecified)
1287       TypeSpecType = TST_int;  // long -> long int.
1288     else if (TypeSpecType != TST_int && TypeSpecType != TST_double &&
1289              !IsFixedPointType) {
1290       S.Diag(TSWRange.getBegin(), diag::err_invalid_width_spec)
1291           << (int)TypeSpecWidth << getSpecifierName((TST)TypeSpecType, Policy);
1292       TypeSpecType = TST_int;
1293       TypeSpecSat = false;
1294       TypeSpecOwned = false;
1295     }
1296     break;
1297   }
1298
1299   // TODO: if the implementation does not implement _Complex or _Imaginary,
1300   // disallow their use.  Need information about the backend.
1301   if (TypeSpecComplex != TSC_unspecified) {
1302     if (TypeSpecType == TST_unspecified) {
1303       S.Diag(TSCLoc, diag::ext_plain_complex)
1304         << FixItHint::CreateInsertion(
1305                               S.getLocForEndOfToken(getTypeSpecComplexLoc()),
1306                                                  " double");
1307       TypeSpecType = TST_double;   // _Complex -> _Complex double.
1308     } else if (TypeSpecType == TST_int || TypeSpecType == TST_char ||
1309                TypeSpecType == TST_bitint) {
1310       // Note that this intentionally doesn't include _Complex _Bool.
1311       if (!S.getLangOpts().CPlusPlus)
1312         S.Diag(TSTLoc, diag::ext_integer_complex);
1313     } else if (TypeSpecType != TST_float && TypeSpecType != TST_double &&
1314                TypeSpecType != TST_float128 && TypeSpecType != TST_float16 &&
1315                TypeSpecType != TST_ibm128) {
1316       // FIXME: __fp16?
1317       S.Diag(TSCLoc, diag::err_invalid_complex_spec)
1318         << getSpecifierName((TST)TypeSpecType, Policy);
1319       TypeSpecComplex = TSC_unspecified;
1320     }
1321   }
1322
1323   // C11 6.7.1/3, C++11 [dcl.stc]p1, GNU TLS: __thread, thread_local and
1324   // _Thread_local can only appear with the 'static' and 'extern' storage class
1325   // specifiers. We also allow __private_extern__ as an extension.
1326   if (ThreadStorageClassSpec != TSCS_unspecified) {
1327     switch (StorageClassSpec) {
1328     case SCS_unspecified:
1329     case SCS_extern:
1330     case SCS_private_extern:
1331     case SCS_static:
1332       break;
1333     default:
1334       if (S.getSourceManager().isBeforeInTranslationUnit(
1335             getThreadStorageClassSpecLoc(), getStorageClassSpecLoc()))
1336         S.Diag(getStorageClassSpecLoc(),
1337              diag::err_invalid_decl_spec_combination)
1338           << DeclSpec::getSpecifierName(getThreadStorageClassSpec())
1339           << SourceRange(getThreadStorageClassSpecLoc());
1340       else
1341         S.Diag(getThreadStorageClassSpecLoc(),
1342              diag::err_invalid_decl_spec_combination)
1343           << DeclSpec::getSpecifierName(getStorageClassSpec())
1344           << SourceRange(getStorageClassSpecLoc());
1345       // Discard the thread storage class specifier to recover.
1346       ThreadStorageClassSpec = TSCS_unspecified;
1347       ThreadStorageClassSpecLoc = SourceLocation();
1348     }
1349   }
1350
1351   // If no type specifier was provided and we're parsing a language where
1352   // the type specifier is not optional, but we got 'auto' as a storage
1353   // class specifier, then assume this is an attempt to use C++0x's 'auto'
1354   // type specifier.
1355   if (S.getLangOpts().CPlusPlus &&
1356       TypeSpecType == TST_unspecified && StorageClassSpec == SCS_auto) {
1357     TypeSpecType = TST_auto;
1358     StorageClassSpec = SCS_unspecified;
1359     TSTLoc = TSTNameLoc = StorageClassSpecLoc;
1360     StorageClassSpecLoc = SourceLocation();
1361   }
1362   // Diagnose if we've recovered from an ill-formed 'auto' storage class
1363   // specifier in a pre-C++11 dialect of C++.
1364   if (!S.getLangOpts().CPlusPlus11 && TypeSpecType == TST_auto)
1365     S.Diag(TSTLoc, diag::ext_auto_type_specifier);
1366   if (S.getLangOpts().CPlusPlus && !S.getLangOpts().CPlusPlus11 &&
1367       StorageClassSpec == SCS_auto)
1368     S.Diag(StorageClassSpecLoc, diag::warn_auto_storage_class)
1369       << FixItHint::CreateRemoval(StorageClassSpecLoc);
1370   if (TypeSpecType == TST_char8)
1371     S.Diag(TSTLoc, diag::warn_cxx17_compat_unicode_type);
1372   else if (TypeSpecType == TST_char16 || TypeSpecType == TST_char32)
1373     S.Diag(TSTLoc, diag::warn_cxx98_compat_unicode_type)
1374       << (TypeSpecType == TST_char16 ? "char16_t" : "char32_t");
1375   if (getConstexprSpecifier() == ConstexprSpecKind::Constexpr)
1376     S.Diag(ConstexprLoc, diag::warn_cxx98_compat_constexpr);
1377   else if (getConstexprSpecifier() == ConstexprSpecKind::Consteval)
1378     S.Diag(ConstexprLoc, diag::warn_cxx20_compat_consteval);
1379   else if (getConstexprSpecifier() == ConstexprSpecKind::Constinit)
1380     S.Diag(ConstexprLoc, diag::warn_cxx20_compat_constinit);
1381   // C++ [class.friend]p6:
1382   //   No storage-class-specifier shall appear in the decl-specifier-seq
1383   //   of a friend declaration.
1384   if (isFriendSpecified() &&
1385       (getStorageClassSpec() || getThreadStorageClassSpec())) {
1386     SmallString<32> SpecName;
1387     SourceLocation SCLoc;
1388     FixItHint StorageHint, ThreadHint;
1389
1390     if (DeclSpec::SCS SC = getStorageClassSpec()) {
1391       SpecName = getSpecifierName(SC);
1392       SCLoc = getStorageClassSpecLoc();
1393       StorageHint = FixItHint::CreateRemoval(SCLoc);
1394     }
1395
1396     if (DeclSpec::TSCS TSC = getThreadStorageClassSpec()) {
1397       if (!SpecName.empty()) SpecName += " ";
1398       SpecName += getSpecifierName(TSC);
1399       SCLoc = getThreadStorageClassSpecLoc();
1400       ThreadHint = FixItHint::CreateRemoval(SCLoc);
1401     }
1402
1403     S.Diag(SCLoc, diag::err_friend_decl_spec)
1404       << SpecName << StorageHint << ThreadHint;
1405
1406     ClearStorageClassSpecs();
1407   }
1408
1409   // C++11 [dcl.fct.spec]p5:
1410   //   The virtual specifier shall be used only in the initial
1411   //   declaration of a non-static class member function;
1412   // C++11 [dcl.fct.spec]p6:
1413   //   The explicit specifier shall be used only in the declaration of
1414   //   a constructor or conversion function within its class
1415   //   definition;
1416   if (isFriendSpecified() && (isVirtualSpecified() || hasExplicitSpecifier())) {
1417     StringRef Keyword;
1418     FixItHint Hint;
1419     SourceLocation SCLoc;
1420
1421     if (isVirtualSpecified()) {
1422       Keyword = "virtual";
1423       SCLoc = getVirtualSpecLoc();
1424       Hint = FixItHint::CreateRemoval(SCLoc);
1425     } else {
1426       Keyword = "explicit";
1427       SCLoc = getExplicitSpecLoc();
1428       Hint = FixItHint::CreateRemoval(getExplicitSpecRange());
1429     }
1430
1431     S.Diag(SCLoc, diag::err_friend_decl_spec)
1432       << Keyword << Hint;
1433
1434     FS_virtual_specified = false;
1435     FS_explicit_specifier = ExplicitSpecifier();
1436     FS_virtualLoc = FS_explicitLoc = SourceLocation();
1437   }
1438
1439   assert(!TypeSpecOwned || isDeclRep((TST) TypeSpecType));
1440
1441   // Okay, now we can infer the real type.
1442
1443   // TODO: return "auto function" and other bad things based on the real type.
1444
1445   // 'data definition has no type or storage class'?
1446 }
1447
1448 bool DeclSpec::isMissingDeclaratorOk() {
1449   TST tst = getTypeSpecType();
1450   return isDeclRep(tst) && getRepAsDecl() != nullptr &&
1451     StorageClassSpec != DeclSpec::SCS_typedef;
1452 }
1453
1454 void UnqualifiedId::setOperatorFunctionId(SourceLocation OperatorLoc,
1455                                           OverloadedOperatorKind Op,
1456                                           SourceLocation SymbolLocations[3]) {
1457   Kind = UnqualifiedIdKind::IK_OperatorFunctionId;
1458   StartLocation = OperatorLoc;
1459   EndLocation = OperatorLoc;
1460   new (&OperatorFunctionId) struct OFI;
1461   OperatorFunctionId.Operator = Op;
1462   for (unsigned I = 0; I != 3; ++I) {
1463     OperatorFunctionId.SymbolLocations[I] = SymbolLocations[I];
1464
1465     if (SymbolLocations[I].isValid())
1466       EndLocation = SymbolLocations[I];
1467   }
1468 }
1469
1470 bool VirtSpecifiers::SetSpecifier(Specifier VS, SourceLocation Loc,
1471                                   const char *&PrevSpec) {
1472   if (!FirstLocation.isValid())
1473     FirstLocation = Loc;
1474   LastLocation = Loc;
1475   LastSpecifier = VS;
1476
1477   if (Specifiers & VS) {
1478     PrevSpec = getSpecifierName(VS);
1479     return true;
1480   }
1481
1482   Specifiers |= VS;
1483
1484   switch (VS) {
1485   default: llvm_unreachable("Unknown specifier!");
1486   case VS_Override: VS_overrideLoc = Loc; break;
1487   case VS_GNU_Final:
1488   case VS_Sealed:
1489   case VS_Final:    VS_finalLoc = Loc; break;
1490   case VS_Abstract: VS_abstractLoc = Loc; break;
1491   }
1492
1493   return false;
1494 }
1495
1496 const char *VirtSpecifiers::getSpecifierName(Specifier VS) {
1497   switch (VS) {
1498   default: llvm_unreachable("Unknown specifier");
1499   case VS_Override: return "override";
1500   case VS_Final: return "final";
1501   case VS_GNU_Final: return "__final";
1502   case VS_Sealed: return "sealed";
1503   case VS_Abstract: return "abstract";
1504   }
1505 }