1 //===--- ASTCommon.cpp - Common stuff for ASTReader/ASTWriter----*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file defines common functions that both ASTReader and ASTWriter use. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "ASTCommon.h" 14 #include "clang/AST/DeclCXX.h" 15 #include "clang/AST/DeclObjC.h" 16 #include "clang/Basic/IdentifierTable.h" 17 #include "clang/Serialization/ASTDeserializationListener.h" 18 #include "llvm/Support/DJB.h" 19 20 using namespace clang; 21 22 // Give ASTDeserializationListener's VTable a home. 23 ASTDeserializationListener::~ASTDeserializationListener() { } 24 25 serialization::TypeIdx 26 serialization::TypeIdxFromBuiltin(const BuiltinType *BT) { 27 unsigned ID = 0; 28 switch (BT->getKind()) { 29 case BuiltinType::Void: 30 ID = PREDEF_TYPE_VOID_ID; 31 break; 32 case BuiltinType::Bool: 33 ID = PREDEF_TYPE_BOOL_ID; 34 break; 35 case BuiltinType::Char_U: 36 ID = PREDEF_TYPE_CHAR_U_ID; 37 break; 38 case BuiltinType::UChar: 39 ID = PREDEF_TYPE_UCHAR_ID; 40 break; 41 case BuiltinType::UShort: 42 ID = PREDEF_TYPE_USHORT_ID; 43 break; 44 case BuiltinType::UInt: 45 ID = PREDEF_TYPE_UINT_ID; 46 break; 47 case BuiltinType::ULong: 48 ID = PREDEF_TYPE_ULONG_ID; 49 break; 50 case BuiltinType::ULongLong: 51 ID = PREDEF_TYPE_ULONGLONG_ID; 52 break; 53 case BuiltinType::UInt128: 54 ID = PREDEF_TYPE_UINT128_ID; 55 break; 56 case BuiltinType::Char_S: 57 ID = PREDEF_TYPE_CHAR_S_ID; 58 break; 59 case BuiltinType::SChar: 60 ID = PREDEF_TYPE_SCHAR_ID; 61 break; 62 case BuiltinType::WChar_S: 63 case BuiltinType::WChar_U: 64 ID = PREDEF_TYPE_WCHAR_ID; 65 break; 66 case BuiltinType::Short: 67 ID = PREDEF_TYPE_SHORT_ID; 68 break; 69 case BuiltinType::Int: 70 ID = PREDEF_TYPE_INT_ID; 71 break; 72 case BuiltinType::Long: 73 ID = PREDEF_TYPE_LONG_ID; 74 break; 75 case BuiltinType::LongLong: 76 ID = PREDEF_TYPE_LONGLONG_ID; 77 break; 78 case BuiltinType::Int128: 79 ID = PREDEF_TYPE_INT128_ID; 80 break; 81 case BuiltinType::Half: 82 ID = PREDEF_TYPE_HALF_ID; 83 break; 84 case BuiltinType::Float: 85 ID = PREDEF_TYPE_FLOAT_ID; 86 break; 87 case BuiltinType::Double: 88 ID = PREDEF_TYPE_DOUBLE_ID; 89 break; 90 case BuiltinType::LongDouble: 91 ID = PREDEF_TYPE_LONGDOUBLE_ID; 92 break; 93 case BuiltinType::ShortAccum: 94 ID = PREDEF_TYPE_SHORT_ACCUM_ID; 95 break; 96 case BuiltinType::Accum: 97 ID = PREDEF_TYPE_ACCUM_ID; 98 break; 99 case BuiltinType::LongAccum: 100 ID = PREDEF_TYPE_LONG_ACCUM_ID; 101 break; 102 case BuiltinType::UShortAccum: 103 ID = PREDEF_TYPE_USHORT_ACCUM_ID; 104 break; 105 case BuiltinType::UAccum: 106 ID = PREDEF_TYPE_UACCUM_ID; 107 break; 108 case BuiltinType::ULongAccum: 109 ID = PREDEF_TYPE_ULONG_ACCUM_ID; 110 break; 111 case BuiltinType::ShortFract: 112 ID = PREDEF_TYPE_SHORT_FRACT_ID; 113 break; 114 case BuiltinType::Fract: 115 ID = PREDEF_TYPE_FRACT_ID; 116 break; 117 case BuiltinType::LongFract: 118 ID = PREDEF_TYPE_LONG_FRACT_ID; 119 break; 120 case BuiltinType::UShortFract: 121 ID = PREDEF_TYPE_USHORT_FRACT_ID; 122 break; 123 case BuiltinType::UFract: 124 ID = PREDEF_TYPE_UFRACT_ID; 125 break; 126 case BuiltinType::ULongFract: 127 ID = PREDEF_TYPE_ULONG_FRACT_ID; 128 break; 129 case BuiltinType::SatShortAccum: 130 ID = PREDEF_TYPE_SAT_SHORT_ACCUM_ID; 131 break; 132 case BuiltinType::SatAccum: 133 ID = PREDEF_TYPE_SAT_ACCUM_ID; 134 break; 135 case BuiltinType::SatLongAccum: 136 ID = PREDEF_TYPE_SAT_LONG_ACCUM_ID; 137 break; 138 case BuiltinType::SatUShortAccum: 139 ID = PREDEF_TYPE_SAT_USHORT_ACCUM_ID; 140 break; 141 case BuiltinType::SatUAccum: 142 ID = PREDEF_TYPE_SAT_UACCUM_ID; 143 break; 144 case BuiltinType::SatULongAccum: 145 ID = PREDEF_TYPE_SAT_ULONG_ACCUM_ID; 146 break; 147 case BuiltinType::SatShortFract: 148 ID = PREDEF_TYPE_SAT_SHORT_FRACT_ID; 149 break; 150 case BuiltinType::SatFract: 151 ID = PREDEF_TYPE_SAT_FRACT_ID; 152 break; 153 case BuiltinType::SatLongFract: 154 ID = PREDEF_TYPE_SAT_LONG_FRACT_ID; 155 break; 156 case BuiltinType::SatUShortFract: 157 ID = PREDEF_TYPE_SAT_USHORT_FRACT_ID; 158 break; 159 case BuiltinType::SatUFract: 160 ID = PREDEF_TYPE_SAT_UFRACT_ID; 161 break; 162 case BuiltinType::SatULongFract: 163 ID = PREDEF_TYPE_SAT_ULONG_FRACT_ID; 164 break; 165 case BuiltinType::Float16: 166 ID = PREDEF_TYPE_FLOAT16_ID; 167 break; 168 case BuiltinType::Float128: 169 ID = PREDEF_TYPE_FLOAT128_ID; 170 break; 171 case BuiltinType::Ibm128: 172 ID = PREDEF_TYPE_IBM128_ID; 173 break; 174 case BuiltinType::NullPtr: 175 ID = PREDEF_TYPE_NULLPTR_ID; 176 break; 177 case BuiltinType::Char8: 178 ID = PREDEF_TYPE_CHAR8_ID; 179 break; 180 case BuiltinType::Char16: 181 ID = PREDEF_TYPE_CHAR16_ID; 182 break; 183 case BuiltinType::Char32: 184 ID = PREDEF_TYPE_CHAR32_ID; 185 break; 186 case BuiltinType::Overload: 187 ID = PREDEF_TYPE_OVERLOAD_ID; 188 break; 189 case BuiltinType::BoundMember: 190 ID = PREDEF_TYPE_BOUND_MEMBER; 191 break; 192 case BuiltinType::PseudoObject: 193 ID = PREDEF_TYPE_PSEUDO_OBJECT; 194 break; 195 case BuiltinType::Dependent: 196 ID = PREDEF_TYPE_DEPENDENT_ID; 197 break; 198 case BuiltinType::UnknownAny: 199 ID = PREDEF_TYPE_UNKNOWN_ANY; 200 break; 201 case BuiltinType::ARCUnbridgedCast: 202 ID = PREDEF_TYPE_ARC_UNBRIDGED_CAST; 203 break; 204 case BuiltinType::ObjCId: 205 ID = PREDEF_TYPE_OBJC_ID; 206 break; 207 case BuiltinType::ObjCClass: 208 ID = PREDEF_TYPE_OBJC_CLASS; 209 break; 210 case BuiltinType::ObjCSel: 211 ID = PREDEF_TYPE_OBJC_SEL; 212 break; 213 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \ 214 case BuiltinType::Id: \ 215 ID = PREDEF_TYPE_##Id##_ID; \ 216 break; 217 #include "clang/Basic/OpenCLImageTypes.def" 218 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \ 219 case BuiltinType::Id: \ 220 ID = PREDEF_TYPE_##Id##_ID; \ 221 break; 222 #include "clang/Basic/OpenCLExtensionTypes.def" 223 case BuiltinType::OCLSampler: 224 ID = PREDEF_TYPE_SAMPLER_ID; 225 break; 226 case BuiltinType::OCLEvent: 227 ID = PREDEF_TYPE_EVENT_ID; 228 break; 229 case BuiltinType::OCLClkEvent: 230 ID = PREDEF_TYPE_CLK_EVENT_ID; 231 break; 232 case BuiltinType::OCLQueue: 233 ID = PREDEF_TYPE_QUEUE_ID; 234 break; 235 case BuiltinType::OCLReserveID: 236 ID = PREDEF_TYPE_RESERVE_ID_ID; 237 break; 238 #define SVE_TYPE(Name, Id, SingletonId) \ 239 case BuiltinType::Id: \ 240 ID = PREDEF_TYPE_##Id##_ID; \ 241 break; 242 #include "clang/Basic/AArch64SVEACLETypes.def" 243 #define PPC_VECTOR_TYPE(Name, Id, Size) \ 244 case BuiltinType::Id: \ 245 ID = PREDEF_TYPE_##Id##_ID; \ 246 break; 247 #include "clang/Basic/PPCTypes.def" 248 #define RVV_TYPE(Name, Id, SingletonId) \ 249 case BuiltinType::Id: \ 250 ID = PREDEF_TYPE_##Id##_ID; \ 251 break; 252 #include "clang/Basic/RISCVVTypes.def" 253 #define WASM_TYPE(Name, Id, SingletonId) \ 254 case BuiltinType::Id: \ 255 ID = PREDEF_TYPE_##Id##_ID; \ 256 break; 257 #include "clang/Basic/WebAssemblyReferenceTypes.def" 258 case BuiltinType::BuiltinFn: 259 ID = PREDEF_TYPE_BUILTIN_FN; 260 break; 261 case BuiltinType::IncompleteMatrixIdx: 262 ID = PREDEF_TYPE_INCOMPLETE_MATRIX_IDX; 263 break; 264 case BuiltinType::OMPArraySection: 265 ID = PREDEF_TYPE_OMP_ARRAY_SECTION; 266 break; 267 case BuiltinType::OMPArrayShaping: 268 ID = PREDEF_TYPE_OMP_ARRAY_SHAPING; 269 break; 270 case BuiltinType::OMPIterator: 271 ID = PREDEF_TYPE_OMP_ITERATOR; 272 break; 273 case BuiltinType::BFloat16: 274 ID = PREDEF_TYPE_BFLOAT16_ID; 275 break; 276 } 277 278 return TypeIdx(ID); 279 } 280 281 unsigned serialization::ComputeHash(Selector Sel) { 282 unsigned N = Sel.getNumArgs(); 283 if (N == 0) 284 ++N; 285 unsigned R = 5381; 286 for (unsigned I = 0; I != N; ++I) 287 if (IdentifierInfo *II = Sel.getIdentifierInfoForSlot(I)) 288 R = llvm::djbHash(II->getName(), R); 289 return R; 290 } 291 292 const DeclContext * 293 serialization::getDefinitiveDeclContext(const DeclContext *DC) { 294 switch (DC->getDeclKind()) { 295 // These entities may have multiple definitions. 296 case Decl::TranslationUnit: 297 case Decl::ExternCContext: 298 case Decl::Namespace: 299 case Decl::LinkageSpec: 300 case Decl::Export: 301 return nullptr; 302 303 // C/C++ tag types can only be defined in one place. 304 case Decl::Enum: 305 case Decl::Record: 306 if (const TagDecl *Def = cast<TagDecl>(DC)->getDefinition()) 307 return Def; 308 return nullptr; 309 310 // FIXME: These can be defined in one place... except special member 311 // functions and out-of-line definitions. 312 case Decl::CXXRecord: 313 case Decl::ClassTemplateSpecialization: 314 case Decl::ClassTemplatePartialSpecialization: 315 return nullptr; 316 317 // Each function, method, and block declaration is its own DeclContext. 318 case Decl::Function: 319 case Decl::CXXMethod: 320 case Decl::CXXConstructor: 321 case Decl::CXXDestructor: 322 case Decl::CXXConversion: 323 case Decl::ObjCMethod: 324 case Decl::Block: 325 case Decl::Captured: 326 // Objective C categories, category implementations, and class 327 // implementations can only be defined in one place. 328 case Decl::ObjCCategory: 329 case Decl::ObjCCategoryImpl: 330 case Decl::ObjCImplementation: 331 return DC; 332 333 case Decl::ObjCProtocol: 334 if (const ObjCProtocolDecl *Def 335 = cast<ObjCProtocolDecl>(DC)->getDefinition()) 336 return Def; 337 return nullptr; 338 339 // FIXME: These are defined in one place, but properties in class extensions 340 // end up being back-patched into the main interface. See 341 // Sema::HandlePropertyInClassExtension for the offending code. 342 case Decl::ObjCInterface: 343 return nullptr; 344 345 default: 346 llvm_unreachable("Unhandled DeclContext in AST reader"); 347 } 348 349 llvm_unreachable("Unhandled decl kind"); 350 } 351 352 bool serialization::isRedeclarableDeclKind(unsigned Kind) { 353 switch (static_cast<Decl::Kind>(Kind)) { 354 case Decl::TranslationUnit: 355 case Decl::ExternCContext: 356 // Special case of a "merged" declaration. 357 return true; 358 359 case Decl::Namespace: 360 case Decl::NamespaceAlias: 361 case Decl::Typedef: 362 case Decl::TypeAlias: 363 case Decl::Enum: 364 case Decl::Record: 365 case Decl::CXXRecord: 366 case Decl::ClassTemplateSpecialization: 367 case Decl::ClassTemplatePartialSpecialization: 368 case Decl::VarTemplateSpecialization: 369 case Decl::VarTemplatePartialSpecialization: 370 case Decl::Function: 371 case Decl::CXXDeductionGuide: 372 case Decl::CXXMethod: 373 case Decl::CXXConstructor: 374 case Decl::CXXDestructor: 375 case Decl::CXXConversion: 376 case Decl::UsingShadow: 377 case Decl::ConstructorUsingShadow: 378 case Decl::Var: 379 case Decl::FunctionTemplate: 380 case Decl::ClassTemplate: 381 case Decl::VarTemplate: 382 case Decl::TypeAliasTemplate: 383 case Decl::ObjCProtocol: 384 case Decl::ObjCInterface: 385 case Decl::Empty: 386 return true; 387 388 // Never redeclarable. 389 case Decl::UsingDirective: 390 case Decl::Label: 391 case Decl::UnresolvedUsingTypename: 392 case Decl::TemplateTypeParm: 393 case Decl::EnumConstant: 394 case Decl::UnresolvedUsingValue: 395 case Decl::IndirectField: 396 case Decl::Field: 397 case Decl::MSProperty: 398 case Decl::MSGuid: 399 case Decl::UnnamedGlobalConstant: 400 case Decl::TemplateParamObject: 401 case Decl::ObjCIvar: 402 case Decl::ObjCAtDefsField: 403 case Decl::NonTypeTemplateParm: 404 case Decl::TemplateTemplateParm: 405 case Decl::Using: 406 case Decl::UsingEnum: 407 case Decl::UsingPack: 408 case Decl::ObjCMethod: 409 case Decl::ObjCCategory: 410 case Decl::ObjCCategoryImpl: 411 case Decl::ObjCImplementation: 412 case Decl::ObjCProperty: 413 case Decl::ObjCCompatibleAlias: 414 case Decl::LinkageSpec: 415 case Decl::Export: 416 case Decl::ObjCPropertyImpl: 417 case Decl::PragmaComment: 418 case Decl::PragmaDetectMismatch: 419 case Decl::FileScopeAsm: 420 case Decl::TopLevelStmt: 421 case Decl::AccessSpec: 422 case Decl::Friend: 423 case Decl::FriendTemplate: 424 case Decl::StaticAssert: 425 case Decl::Block: 426 case Decl::Captured: 427 case Decl::Import: 428 case Decl::OMPThreadPrivate: 429 case Decl::OMPAllocate: 430 case Decl::OMPRequires: 431 case Decl::OMPCapturedExpr: 432 case Decl::OMPDeclareReduction: 433 case Decl::OMPDeclareMapper: 434 case Decl::BuiltinTemplate: 435 case Decl::Decomposition: 436 case Decl::Binding: 437 case Decl::Concept: 438 case Decl::ImplicitConceptSpecialization: 439 case Decl::LifetimeExtendedTemporary: 440 case Decl::RequiresExprBody: 441 case Decl::UnresolvedUsingIfExists: 442 case Decl::HLSLBuffer: 443 return false; 444 445 // These indirectly derive from Redeclarable<T> but are not actually 446 // redeclarable. 447 case Decl::ImplicitParam: 448 case Decl::ParmVar: 449 case Decl::ObjCTypeParam: 450 return false; 451 } 452 453 llvm_unreachable("Unhandled declaration kind"); 454 } 455 456 bool serialization::needsAnonymousDeclarationNumber(const NamedDecl *D) { 457 // Friend declarations in dependent contexts aren't anonymous in the usual 458 // sense, but they cannot be found by name lookup in their semantic context 459 // (or indeed in any context), so we treat them as anonymous. 460 // 461 // This doesn't apply to friend tag decls; Sema makes those available to name 462 // lookup in the surrounding context. 463 if (D->getFriendObjectKind() && 464 D->getLexicalDeclContext()->isDependentContext() && !isa<TagDecl>(D)) { 465 // For function templates and class templates, the template is numbered and 466 // not its pattern. 467 if (auto *FD = dyn_cast<FunctionDecl>(D)) 468 return !FD->getDescribedFunctionTemplate(); 469 if (auto *RD = dyn_cast<CXXRecordDecl>(D)) 470 return !RD->getDescribedClassTemplate(); 471 return true; 472 } 473 474 // At block scope, we number everything that we need to deduplicate, since we 475 // can't just use name matching to keep things lined up. 476 // FIXME: This is only necessary for an inline function or a template or 477 // similar. 478 if (D->getLexicalDeclContext()->isFunctionOrMethod()) { 479 if (auto *VD = dyn_cast<VarDecl>(D)) 480 return VD->isStaticLocal(); 481 // FIXME: What about CapturedDecls (and declarations nested within them)? 482 return isa<TagDecl, BlockDecl>(D); 483 } 484 485 // Otherwise, we only care about anonymous class members / block-scope decls. 486 // FIXME: We need to handle blocks within inline / templated variables too. 487 if (D->getDeclName()) 488 return false; 489 if (!isa<RecordDecl, ObjCInterfaceDecl>(D->getLexicalDeclContext())) 490 return false; 491 return isa<TagDecl, FieldDecl>(D); 492 } 493