1 //===--- CodeGenTypes.cpp - Type translation for LLVM CodeGen -------------===// 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 is the code that handles AST -> LLVM type lowering. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "CodeGenTypes.h" 14 #include "CGCXXABI.h" 15 #include "CGCall.h" 16 #include "CGOpenCLRuntime.h" 17 #include "CGRecordLayout.h" 18 #include "TargetInfo.h" 19 #include "clang/AST/ASTContext.h" 20 #include "clang/AST/DeclCXX.h" 21 #include "clang/AST/DeclObjC.h" 22 #include "clang/AST/Expr.h" 23 #include "clang/AST/RecordLayout.h" 24 #include "clang/CodeGen/CGFunctionInfo.h" 25 #include "llvm/IR/DataLayout.h" 26 #include "llvm/IR/DerivedTypes.h" 27 #include "llvm/IR/Module.h" 28 29 using namespace clang; 30 using namespace CodeGen; 31 32 CodeGenTypes::CodeGenTypes(CodeGenModule &cgm) 33 : CGM(cgm), Context(cgm.getContext()), TheModule(cgm.getModule()), 34 Target(cgm.getTarget()), TheCXXABI(cgm.getCXXABI()), 35 TheABIInfo(cgm.getTargetCodeGenInfo().getABIInfo()) { 36 SkippedLayout = false; 37 } 38 39 CodeGenTypes::~CodeGenTypes() { 40 for (llvm::FoldingSet<CGFunctionInfo>::iterator 41 I = FunctionInfos.begin(), E = FunctionInfos.end(); I != E; ) 42 delete &*I++; 43 } 44 45 const CodeGenOptions &CodeGenTypes::getCodeGenOpts() const { 46 return CGM.getCodeGenOpts(); 47 } 48 49 void CodeGenTypes::addRecordTypeName(const RecordDecl *RD, 50 llvm::StructType *Ty, 51 StringRef suffix) { 52 SmallString<256> TypeName; 53 llvm::raw_svector_ostream OS(TypeName); 54 OS << RD->getKindName() << '.'; 55 56 // FIXME: We probably want to make more tweaks to the printing policy. For 57 // example, we should probably enable PrintCanonicalTypes and 58 // FullyQualifiedNames. 59 PrintingPolicy Policy = RD->getASTContext().getPrintingPolicy(); 60 Policy.SuppressInlineNamespace = false; 61 62 // Name the codegen type after the typedef name 63 // if there is no tag type name available 64 if (RD->getIdentifier()) { 65 // FIXME: We should not have to check for a null decl context here. 66 // Right now we do it because the implicit Obj-C decls don't have one. 67 if (RD->getDeclContext()) 68 RD->printQualifiedName(OS, Policy); 69 else 70 RD->printName(OS, Policy); 71 } else if (const TypedefNameDecl *TDD = RD->getTypedefNameForAnonDecl()) { 72 // FIXME: We should not have to check for a null decl context here. 73 // Right now we do it because the implicit Obj-C decls don't have one. 74 if (TDD->getDeclContext()) 75 TDD->printQualifiedName(OS, Policy); 76 else 77 TDD->printName(OS); 78 } else 79 OS << "anon"; 80 81 if (!suffix.empty()) 82 OS << suffix; 83 84 Ty->setName(OS.str()); 85 } 86 87 /// ConvertTypeForMem - Convert type T into a llvm::Type. This differs from 88 /// ConvertType in that it is used to convert to the memory representation for 89 /// a type. For example, the scalar representation for _Bool is i1, but the 90 /// memory representation is usually i8 or i32, depending on the target. 91 llvm::Type *CodeGenTypes::ConvertTypeForMem(QualType T, bool ForBitField) { 92 if (T->isConstantMatrixType()) { 93 const Type *Ty = Context.getCanonicalType(T).getTypePtr(); 94 const ConstantMatrixType *MT = cast<ConstantMatrixType>(Ty); 95 return llvm::ArrayType::get(ConvertType(MT->getElementType()), 96 MT->getNumRows() * MT->getNumColumns()); 97 } 98 99 llvm::Type *R = ConvertType(T); 100 101 // Check for the boolean vector case. 102 if (T->isExtVectorBoolType()) { 103 auto *FixedVT = cast<llvm::FixedVectorType>(R); 104 // Pad to at least one byte. 105 uint64_t BytePadded = std::max<uint64_t>(FixedVT->getNumElements(), 8); 106 return llvm::IntegerType::get(FixedVT->getContext(), BytePadded); 107 } 108 109 // If this is a bool type, or a bit-precise integer type in a bitfield 110 // representation, map this integer to the target-specified size. 111 if ((ForBitField && T->isBitIntType()) || 112 (!T->isBitIntType() && R->isIntegerTy(1))) 113 return llvm::IntegerType::get(getLLVMContext(), 114 (unsigned)Context.getTypeSize(T)); 115 116 // Else, don't map it. 117 return R; 118 } 119 120 /// isRecordLayoutComplete - Return true if the specified type is already 121 /// completely laid out. 122 bool CodeGenTypes::isRecordLayoutComplete(const Type *Ty) const { 123 llvm::DenseMap<const Type*, llvm::StructType *>::const_iterator I = 124 RecordDeclTypes.find(Ty); 125 return I != RecordDeclTypes.end() && !I->second->isOpaque(); 126 } 127 128 /// isFuncParamTypeConvertible - Return true if the specified type in a 129 /// function parameter or result position can be converted to an IR type at this 130 /// point. This boils down to being whether it is complete. 131 bool CodeGenTypes::isFuncParamTypeConvertible(QualType Ty) { 132 // Some ABIs cannot have their member pointers represented in IR unless 133 // certain circumstances have been reached. 134 if (const auto *MPT = Ty->getAs<MemberPointerType>()) 135 return getCXXABI().isMemberPointerConvertible(MPT); 136 137 // If this isn't a tagged type, we can convert it! 138 const TagType *TT = Ty->getAs<TagType>(); 139 if (!TT) return true; 140 141 // Incomplete types cannot be converted. 142 return !TT->isIncompleteType(); 143 } 144 145 146 /// Code to verify a given function type is complete, i.e. the return type 147 /// and all of the parameter types are complete. Also check to see if we are in 148 /// a RS_StructPointer context, and if so whether any struct types have been 149 /// pended. If so, we don't want to ask the ABI lowering code to handle a type 150 /// that cannot be converted to an IR type. 151 bool CodeGenTypes::isFuncTypeConvertible(const FunctionType *FT) { 152 if (!isFuncParamTypeConvertible(FT->getReturnType())) 153 return false; 154 155 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT)) 156 for (unsigned i = 0, e = FPT->getNumParams(); i != e; i++) 157 if (!isFuncParamTypeConvertible(FPT->getParamType(i))) 158 return false; 159 160 return true; 161 } 162 163 /// UpdateCompletedType - When we find the full definition for a TagDecl, 164 /// replace the 'opaque' type we previously made for it if applicable. 165 void CodeGenTypes::UpdateCompletedType(const TagDecl *TD) { 166 // If this is an enum being completed, then we flush all non-struct types from 167 // the cache. This allows function types and other things that may be derived 168 // from the enum to be recomputed. 169 if (const EnumDecl *ED = dyn_cast<EnumDecl>(TD)) { 170 // Only flush the cache if we've actually already converted this type. 171 if (TypeCache.count(ED->getTypeForDecl())) { 172 // Okay, we formed some types based on this. We speculated that the enum 173 // would be lowered to i32, so we only need to flush the cache if this 174 // didn't happen. 175 if (!ConvertType(ED->getIntegerType())->isIntegerTy(32)) 176 TypeCache.clear(); 177 } 178 // If necessary, provide the full definition of a type only used with a 179 // declaration so far. 180 if (CGDebugInfo *DI = CGM.getModuleDebugInfo()) 181 DI->completeType(ED); 182 return; 183 } 184 185 // If we completed a RecordDecl that we previously used and converted to an 186 // anonymous type, then go ahead and complete it now. 187 const RecordDecl *RD = cast<RecordDecl>(TD); 188 if (RD->isDependentType()) return; 189 190 // Only complete it if we converted it already. If we haven't converted it 191 // yet, we'll just do it lazily. 192 if (RecordDeclTypes.count(Context.getTagDeclType(RD).getTypePtr())) 193 ConvertRecordDeclType(RD); 194 195 // If necessary, provide the full definition of a type only used with a 196 // declaration so far. 197 if (CGDebugInfo *DI = CGM.getModuleDebugInfo()) 198 DI->completeType(RD); 199 } 200 201 void CodeGenTypes::RefreshTypeCacheForClass(const CXXRecordDecl *RD) { 202 QualType T = Context.getRecordType(RD); 203 T = Context.getCanonicalType(T); 204 205 const Type *Ty = T.getTypePtr(); 206 if (RecordsWithOpaqueMemberPointers.count(Ty)) { 207 TypeCache.clear(); 208 RecordsWithOpaqueMemberPointers.clear(); 209 } 210 } 211 212 static llvm::Type *getTypeForFormat(llvm::LLVMContext &VMContext, 213 const llvm::fltSemantics &format, 214 bool UseNativeHalf = false) { 215 if (&format == &llvm::APFloat::IEEEhalf()) { 216 if (UseNativeHalf) 217 return llvm::Type::getHalfTy(VMContext); 218 else 219 return llvm::Type::getInt16Ty(VMContext); 220 } 221 if (&format == &llvm::APFloat::BFloat()) 222 return llvm::Type::getBFloatTy(VMContext); 223 if (&format == &llvm::APFloat::IEEEsingle()) 224 return llvm::Type::getFloatTy(VMContext); 225 if (&format == &llvm::APFloat::IEEEdouble()) 226 return llvm::Type::getDoubleTy(VMContext); 227 if (&format == &llvm::APFloat::IEEEquad()) 228 return llvm::Type::getFP128Ty(VMContext); 229 if (&format == &llvm::APFloat::PPCDoubleDouble()) 230 return llvm::Type::getPPC_FP128Ty(VMContext); 231 if (&format == &llvm::APFloat::x87DoubleExtended()) 232 return llvm::Type::getX86_FP80Ty(VMContext); 233 llvm_unreachable("Unknown float format!"); 234 } 235 236 llvm::Type *CodeGenTypes::ConvertFunctionTypeInternal(QualType QFT) { 237 assert(QFT.isCanonical()); 238 const FunctionType *FT = cast<FunctionType>(QFT.getTypePtr()); 239 // First, check whether we can build the full function type. If the 240 // function type depends on an incomplete type (e.g. a struct or enum), we 241 // cannot lower the function type. 242 if (!isFuncTypeConvertible(FT)) { 243 // This function's type depends on an incomplete tag type. 244 245 // Force conversion of all the relevant record types, to make sure 246 // we re-convert the FunctionType when appropriate. 247 if (const RecordType *RT = FT->getReturnType()->getAs<RecordType>()) 248 ConvertRecordDeclType(RT->getDecl()); 249 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT)) 250 for (unsigned i = 0, e = FPT->getNumParams(); i != e; i++) 251 if (const RecordType *RT = FPT->getParamType(i)->getAs<RecordType>()) 252 ConvertRecordDeclType(RT->getDecl()); 253 254 SkippedLayout = true; 255 256 // Return a placeholder type. 257 return llvm::StructType::get(getLLVMContext()); 258 } 259 260 // The function type can be built; call the appropriate routines to 261 // build it. 262 const CGFunctionInfo *FI; 263 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FT)) { 264 FI = &arrangeFreeFunctionType( 265 CanQual<FunctionProtoType>::CreateUnsafe(QualType(FPT, 0))); 266 } else { 267 const FunctionNoProtoType *FNPT = cast<FunctionNoProtoType>(FT); 268 FI = &arrangeFreeFunctionType( 269 CanQual<FunctionNoProtoType>::CreateUnsafe(QualType(FNPT, 0))); 270 } 271 272 llvm::Type *ResultType = nullptr; 273 // If there is something higher level prodding our CGFunctionInfo, then 274 // don't recurse into it again. 275 if (FunctionsBeingProcessed.count(FI)) { 276 277 ResultType = llvm::StructType::get(getLLVMContext()); 278 SkippedLayout = true; 279 } else { 280 281 // Otherwise, we're good to go, go ahead and convert it. 282 ResultType = GetFunctionType(*FI); 283 } 284 285 return ResultType; 286 } 287 288 /// ConvertType - Convert the specified type to its LLVM form. 289 llvm::Type *CodeGenTypes::ConvertType(QualType T) { 290 T = Context.getCanonicalType(T); 291 292 const Type *Ty = T.getTypePtr(); 293 294 // For the device-side compilation, CUDA device builtin surface/texture types 295 // may be represented in different types. 296 if (Context.getLangOpts().CUDAIsDevice) { 297 if (T->isCUDADeviceBuiltinSurfaceType()) { 298 if (auto *Ty = CGM.getTargetCodeGenInfo() 299 .getCUDADeviceBuiltinSurfaceDeviceType()) 300 return Ty; 301 } else if (T->isCUDADeviceBuiltinTextureType()) { 302 if (auto *Ty = CGM.getTargetCodeGenInfo() 303 .getCUDADeviceBuiltinTextureDeviceType()) 304 return Ty; 305 } 306 } 307 308 // RecordTypes are cached and processed specially. 309 if (const RecordType *RT = dyn_cast<RecordType>(Ty)) 310 return ConvertRecordDeclType(RT->getDecl()); 311 312 llvm::Type *CachedType = nullptr; 313 auto TCI = TypeCache.find(Ty); 314 if (TCI != TypeCache.end()) 315 CachedType = TCI->second; 316 // With expensive checks, check that the type we compute matches the 317 // cached type. 318 #ifndef EXPENSIVE_CHECKS 319 if (CachedType) 320 return CachedType; 321 #endif 322 323 // If we don't have it in the cache, convert it now. 324 llvm::Type *ResultType = nullptr; 325 switch (Ty->getTypeClass()) { 326 case Type::Record: // Handled above. 327 #define TYPE(Class, Base) 328 #define ABSTRACT_TYPE(Class, Base) 329 #define NON_CANONICAL_TYPE(Class, Base) case Type::Class: 330 #define DEPENDENT_TYPE(Class, Base) case Type::Class: 331 #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) case Type::Class: 332 #include "clang/AST/TypeNodes.inc" 333 llvm_unreachable("Non-canonical or dependent types aren't possible."); 334 335 case Type::Builtin: { 336 switch (cast<BuiltinType>(Ty)->getKind()) { 337 case BuiltinType::Void: 338 case BuiltinType::ObjCId: 339 case BuiltinType::ObjCClass: 340 case BuiltinType::ObjCSel: 341 // LLVM void type can only be used as the result of a function call. Just 342 // map to the same as char. 343 ResultType = llvm::Type::getInt8Ty(getLLVMContext()); 344 break; 345 346 case BuiltinType::Bool: 347 // Note that we always return bool as i1 for use as a scalar type. 348 ResultType = llvm::Type::getInt1Ty(getLLVMContext()); 349 break; 350 351 case BuiltinType::Char_S: 352 case BuiltinType::Char_U: 353 case BuiltinType::SChar: 354 case BuiltinType::UChar: 355 case BuiltinType::Short: 356 case BuiltinType::UShort: 357 case BuiltinType::Int: 358 case BuiltinType::UInt: 359 case BuiltinType::Long: 360 case BuiltinType::ULong: 361 case BuiltinType::LongLong: 362 case BuiltinType::ULongLong: 363 case BuiltinType::WChar_S: 364 case BuiltinType::WChar_U: 365 case BuiltinType::Char8: 366 case BuiltinType::Char16: 367 case BuiltinType::Char32: 368 case BuiltinType::ShortAccum: 369 case BuiltinType::Accum: 370 case BuiltinType::LongAccum: 371 case BuiltinType::UShortAccum: 372 case BuiltinType::UAccum: 373 case BuiltinType::ULongAccum: 374 case BuiltinType::ShortFract: 375 case BuiltinType::Fract: 376 case BuiltinType::LongFract: 377 case BuiltinType::UShortFract: 378 case BuiltinType::UFract: 379 case BuiltinType::ULongFract: 380 case BuiltinType::SatShortAccum: 381 case BuiltinType::SatAccum: 382 case BuiltinType::SatLongAccum: 383 case BuiltinType::SatUShortAccum: 384 case BuiltinType::SatUAccum: 385 case BuiltinType::SatULongAccum: 386 case BuiltinType::SatShortFract: 387 case BuiltinType::SatFract: 388 case BuiltinType::SatLongFract: 389 case BuiltinType::SatUShortFract: 390 case BuiltinType::SatUFract: 391 case BuiltinType::SatULongFract: 392 ResultType = llvm::IntegerType::get(getLLVMContext(), 393 static_cast<unsigned>(Context.getTypeSize(T))); 394 break; 395 396 case BuiltinType::Float16: 397 ResultType = 398 getTypeForFormat(getLLVMContext(), Context.getFloatTypeSemantics(T), 399 /* UseNativeHalf = */ true); 400 break; 401 402 case BuiltinType::Half: 403 // Half FP can either be storage-only (lowered to i16) or native. 404 ResultType = getTypeForFormat( 405 getLLVMContext(), Context.getFloatTypeSemantics(T), 406 Context.getLangOpts().NativeHalfType || 407 !Context.getTargetInfo().useFP16ConversionIntrinsics()); 408 break; 409 case BuiltinType::BFloat16: 410 case BuiltinType::Float: 411 case BuiltinType::Double: 412 case BuiltinType::LongDouble: 413 case BuiltinType::Float128: 414 case BuiltinType::Ibm128: 415 ResultType = getTypeForFormat(getLLVMContext(), 416 Context.getFloatTypeSemantics(T), 417 /* UseNativeHalf = */ false); 418 break; 419 420 case BuiltinType::NullPtr: 421 // Model std::nullptr_t as i8* 422 ResultType = llvm::Type::getInt8PtrTy(getLLVMContext()); 423 break; 424 425 case BuiltinType::UInt128: 426 case BuiltinType::Int128: 427 ResultType = llvm::IntegerType::get(getLLVMContext(), 128); 428 break; 429 430 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \ 431 case BuiltinType::Id: 432 #include "clang/Basic/OpenCLImageTypes.def" 433 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \ 434 case BuiltinType::Id: 435 #include "clang/Basic/OpenCLExtensionTypes.def" 436 case BuiltinType::OCLSampler: 437 case BuiltinType::OCLEvent: 438 case BuiltinType::OCLClkEvent: 439 case BuiltinType::OCLQueue: 440 case BuiltinType::OCLReserveID: 441 ResultType = CGM.getOpenCLRuntime().convertOpenCLSpecificType(Ty); 442 break; 443 case BuiltinType::SveInt8: 444 case BuiltinType::SveUint8: 445 case BuiltinType::SveInt8x2: 446 case BuiltinType::SveUint8x2: 447 case BuiltinType::SveInt8x3: 448 case BuiltinType::SveUint8x3: 449 case BuiltinType::SveInt8x4: 450 case BuiltinType::SveUint8x4: 451 case BuiltinType::SveInt16: 452 case BuiltinType::SveUint16: 453 case BuiltinType::SveInt16x2: 454 case BuiltinType::SveUint16x2: 455 case BuiltinType::SveInt16x3: 456 case BuiltinType::SveUint16x3: 457 case BuiltinType::SveInt16x4: 458 case BuiltinType::SveUint16x4: 459 case BuiltinType::SveInt32: 460 case BuiltinType::SveUint32: 461 case BuiltinType::SveInt32x2: 462 case BuiltinType::SveUint32x2: 463 case BuiltinType::SveInt32x3: 464 case BuiltinType::SveUint32x3: 465 case BuiltinType::SveInt32x4: 466 case BuiltinType::SveUint32x4: 467 case BuiltinType::SveInt64: 468 case BuiltinType::SveUint64: 469 case BuiltinType::SveInt64x2: 470 case BuiltinType::SveUint64x2: 471 case BuiltinType::SveInt64x3: 472 case BuiltinType::SveUint64x3: 473 case BuiltinType::SveInt64x4: 474 case BuiltinType::SveUint64x4: 475 case BuiltinType::SveBool: 476 case BuiltinType::SveBoolx2: 477 case BuiltinType::SveBoolx4: 478 case BuiltinType::SveFloat16: 479 case BuiltinType::SveFloat16x2: 480 case BuiltinType::SveFloat16x3: 481 case BuiltinType::SveFloat16x4: 482 case BuiltinType::SveFloat32: 483 case BuiltinType::SveFloat32x2: 484 case BuiltinType::SveFloat32x3: 485 case BuiltinType::SveFloat32x4: 486 case BuiltinType::SveFloat64: 487 case BuiltinType::SveFloat64x2: 488 case BuiltinType::SveFloat64x3: 489 case BuiltinType::SveFloat64x4: 490 case BuiltinType::SveBFloat16: 491 case BuiltinType::SveBFloat16x2: 492 case BuiltinType::SveBFloat16x3: 493 case BuiltinType::SveBFloat16x4: { 494 ASTContext::BuiltinVectorTypeInfo Info = 495 Context.getBuiltinVectorTypeInfo(cast<BuiltinType>(Ty)); 496 return llvm::ScalableVectorType::get(ConvertType(Info.ElementType), 497 Info.EC.getKnownMinValue() * 498 Info.NumVectors); 499 } 500 case BuiltinType::SveCount: 501 return llvm::TargetExtType::get(getLLVMContext(), "aarch64.svcount"); 502 #define PPC_VECTOR_TYPE(Name, Id, Size) \ 503 case BuiltinType::Id: \ 504 ResultType = \ 505 llvm::FixedVectorType::get(ConvertType(Context.BoolTy), Size); \ 506 break; 507 #include "clang/Basic/PPCTypes.def" 508 #define RVV_TYPE(Name, Id, SingletonId) case BuiltinType::Id: 509 #include "clang/Basic/RISCVVTypes.def" 510 { 511 ASTContext::BuiltinVectorTypeInfo Info = 512 Context.getBuiltinVectorTypeInfo(cast<BuiltinType>(Ty)); 513 // Tuple types are expressed as aggregregate types of the same scalable 514 // vector type (e.g. vint32m1x2_t is two vint32m1_t, which is {<vscale x 515 // 2 x i32>, <vscale x 2 x i32>}). 516 if (Info.NumVectors != 1) { 517 llvm::Type *EltTy = llvm::ScalableVectorType::get( 518 ConvertType(Info.ElementType), Info.EC.getKnownMinValue()); 519 llvm::SmallVector<llvm::Type *, 4> EltTys(Info.NumVectors, EltTy); 520 return llvm::StructType::get(getLLVMContext(), EltTys); 521 } 522 return llvm::ScalableVectorType::get(ConvertType(Info.ElementType), 523 Info.EC.getKnownMinValue() * 524 Info.NumVectors); 525 } 526 #define WASM_REF_TYPE(Name, MangledName, Id, SingletonId, AS) \ 527 case BuiltinType::Id: { \ 528 if (BuiltinType::Id == BuiltinType::WasmExternRef) \ 529 ResultType = CGM.getTargetCodeGenInfo().getWasmExternrefReferenceType(); \ 530 else \ 531 llvm_unreachable("Unexpected wasm reference builtin type!"); \ 532 } break; 533 #include "clang/Basic/WebAssemblyReferenceTypes.def" 534 case BuiltinType::Dependent: 535 #define BUILTIN_TYPE(Id, SingletonId) 536 #define PLACEHOLDER_TYPE(Id, SingletonId) \ 537 case BuiltinType::Id: 538 #include "clang/AST/BuiltinTypes.def" 539 llvm_unreachable("Unexpected placeholder builtin type!"); 540 } 541 break; 542 } 543 case Type::Auto: 544 case Type::DeducedTemplateSpecialization: 545 llvm_unreachable("Unexpected undeduced type!"); 546 case Type::Complex: { 547 llvm::Type *EltTy = ConvertType(cast<ComplexType>(Ty)->getElementType()); 548 ResultType = llvm::StructType::get(EltTy, EltTy); 549 break; 550 } 551 case Type::LValueReference: 552 case Type::RValueReference: { 553 const ReferenceType *RTy = cast<ReferenceType>(Ty); 554 QualType ETy = RTy->getPointeeType(); 555 unsigned AS = getTargetAddressSpace(ETy); 556 ResultType = llvm::PointerType::get(getLLVMContext(), AS); 557 break; 558 } 559 case Type::Pointer: { 560 const PointerType *PTy = cast<PointerType>(Ty); 561 QualType ETy = PTy->getPointeeType(); 562 unsigned AS = getTargetAddressSpace(ETy); 563 ResultType = llvm::PointerType::get(getLLVMContext(), AS); 564 break; 565 } 566 567 case Type::VariableArray: { 568 const VariableArrayType *A = cast<VariableArrayType>(Ty); 569 assert(A->getIndexTypeCVRQualifiers() == 0 && 570 "FIXME: We only handle trivial array types so far!"); 571 // VLAs resolve to the innermost element type; this matches 572 // the return of alloca, and there isn't any obviously better choice. 573 ResultType = ConvertTypeForMem(A->getElementType()); 574 break; 575 } 576 case Type::IncompleteArray: { 577 const IncompleteArrayType *A = cast<IncompleteArrayType>(Ty); 578 assert(A->getIndexTypeCVRQualifiers() == 0 && 579 "FIXME: We only handle trivial array types so far!"); 580 // int X[] -> [0 x int], unless the element type is not sized. If it is 581 // unsized (e.g. an incomplete struct) just use [0 x i8]. 582 ResultType = ConvertTypeForMem(A->getElementType()); 583 if (!ResultType->isSized()) { 584 SkippedLayout = true; 585 ResultType = llvm::Type::getInt8Ty(getLLVMContext()); 586 } 587 ResultType = llvm::ArrayType::get(ResultType, 0); 588 break; 589 } 590 case Type::ConstantArray: { 591 const ConstantArrayType *A = cast<ConstantArrayType>(Ty); 592 llvm::Type *EltTy = ConvertTypeForMem(A->getElementType()); 593 594 // Lower arrays of undefined struct type to arrays of i8 just to have a 595 // concrete type. 596 if (!EltTy->isSized()) { 597 SkippedLayout = true; 598 EltTy = llvm::Type::getInt8Ty(getLLVMContext()); 599 } 600 601 ResultType = llvm::ArrayType::get(EltTy, A->getSize().getZExtValue()); 602 break; 603 } 604 case Type::ExtVector: 605 case Type::Vector: { 606 const auto *VT = cast<VectorType>(Ty); 607 // An ext_vector_type of Bool is really a vector of bits. 608 llvm::Type *IRElemTy = VT->isExtVectorBoolType() 609 ? llvm::Type::getInt1Ty(getLLVMContext()) 610 : ConvertType(VT->getElementType()); 611 ResultType = llvm::FixedVectorType::get(IRElemTy, VT->getNumElements()); 612 break; 613 } 614 case Type::ConstantMatrix: { 615 const ConstantMatrixType *MT = cast<ConstantMatrixType>(Ty); 616 ResultType = 617 llvm::FixedVectorType::get(ConvertType(MT->getElementType()), 618 MT->getNumRows() * MT->getNumColumns()); 619 break; 620 } 621 case Type::FunctionNoProto: 622 case Type::FunctionProto: 623 ResultType = ConvertFunctionTypeInternal(T); 624 break; 625 case Type::ObjCObject: 626 ResultType = ConvertType(cast<ObjCObjectType>(Ty)->getBaseType()); 627 break; 628 629 case Type::ObjCInterface: { 630 // Objective-C interfaces are always opaque (outside of the 631 // runtime, which can do whatever it likes); we never refine 632 // these. 633 llvm::Type *&T = InterfaceTypes[cast<ObjCInterfaceType>(Ty)]; 634 if (!T) 635 T = llvm::StructType::create(getLLVMContext()); 636 ResultType = T; 637 break; 638 } 639 640 case Type::ObjCObjectPointer: 641 ResultType = llvm::PointerType::getUnqual(getLLVMContext()); 642 break; 643 644 case Type::Enum: { 645 const EnumDecl *ED = cast<EnumType>(Ty)->getDecl(); 646 if (ED->isCompleteDefinition() || ED->isFixed()) 647 return ConvertType(ED->getIntegerType()); 648 // Return a placeholder 'i32' type. This can be changed later when the 649 // type is defined (see UpdateCompletedType), but is likely to be the 650 // "right" answer. 651 ResultType = llvm::Type::getInt32Ty(getLLVMContext()); 652 break; 653 } 654 655 case Type::BlockPointer: { 656 // Block pointers lower to function type. For function type, 657 // getTargetAddressSpace() returns default address space for 658 // function pointer i.e. program address space. Therefore, for block 659 // pointers, it is important to pass the pointee AST address space when 660 // calling getTargetAddressSpace(), to ensure that we get the LLVM IR 661 // address space for data pointers and not function pointers. 662 const QualType FTy = cast<BlockPointerType>(Ty)->getPointeeType(); 663 unsigned AS = Context.getTargetAddressSpace(FTy.getAddressSpace()); 664 ResultType = llvm::PointerType::get(getLLVMContext(), AS); 665 break; 666 } 667 668 case Type::MemberPointer: { 669 auto *MPTy = cast<MemberPointerType>(Ty); 670 if (!getCXXABI().isMemberPointerConvertible(MPTy)) { 671 auto *C = MPTy->getClass(); 672 auto Insertion = RecordsWithOpaqueMemberPointers.insert({C, nullptr}); 673 if (Insertion.second) 674 Insertion.first->second = llvm::StructType::create(getLLVMContext()); 675 ResultType = Insertion.first->second; 676 } else { 677 ResultType = getCXXABI().ConvertMemberPointerType(MPTy); 678 } 679 break; 680 } 681 682 case Type::Atomic: { 683 QualType valueType = cast<AtomicType>(Ty)->getValueType(); 684 ResultType = ConvertTypeForMem(valueType); 685 686 // Pad out to the inflated size if necessary. 687 uint64_t valueSize = Context.getTypeSize(valueType); 688 uint64_t atomicSize = Context.getTypeSize(Ty); 689 if (valueSize != atomicSize) { 690 assert(valueSize < atomicSize); 691 llvm::Type *elts[] = { 692 ResultType, 693 llvm::ArrayType::get(CGM.Int8Ty, (atomicSize - valueSize) / 8) 694 }; 695 ResultType = 696 llvm::StructType::get(getLLVMContext(), llvm::ArrayRef(elts)); 697 } 698 break; 699 } 700 case Type::Pipe: { 701 ResultType = CGM.getOpenCLRuntime().getPipeType(cast<PipeType>(Ty)); 702 break; 703 } 704 case Type::BitInt: { 705 const auto &EIT = cast<BitIntType>(Ty); 706 ResultType = llvm::Type::getIntNTy(getLLVMContext(), EIT->getNumBits()); 707 break; 708 } 709 } 710 711 assert(ResultType && "Didn't convert a type?"); 712 assert((!CachedType || CachedType == ResultType) && 713 "Cached type doesn't match computed type"); 714 715 TypeCache[Ty] = ResultType; 716 return ResultType; 717 } 718 719 bool CodeGenModule::isPaddedAtomicType(QualType type) { 720 return isPaddedAtomicType(type->castAs<AtomicType>()); 721 } 722 723 bool CodeGenModule::isPaddedAtomicType(const AtomicType *type) { 724 return Context.getTypeSize(type) != Context.getTypeSize(type->getValueType()); 725 } 726 727 /// ConvertRecordDeclType - Lay out a tagged decl type like struct or union. 728 llvm::StructType *CodeGenTypes::ConvertRecordDeclType(const RecordDecl *RD) { 729 // TagDecl's are not necessarily unique, instead use the (clang) 730 // type connected to the decl. 731 const Type *Key = Context.getTagDeclType(RD).getTypePtr(); 732 733 llvm::StructType *&Entry = RecordDeclTypes[Key]; 734 735 // If we don't have a StructType at all yet, create the forward declaration. 736 if (!Entry) { 737 Entry = llvm::StructType::create(getLLVMContext()); 738 addRecordTypeName(RD, Entry, ""); 739 } 740 llvm::StructType *Ty = Entry; 741 742 // If this is still a forward declaration, or the LLVM type is already 743 // complete, there's nothing more to do. 744 RD = RD->getDefinition(); 745 if (!RD || !RD->isCompleteDefinition() || !Ty->isOpaque()) 746 return Ty; 747 748 // Force conversion of non-virtual base classes recursively. 749 if (const CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) { 750 for (const auto &I : CRD->bases()) { 751 if (I.isVirtual()) continue; 752 ConvertRecordDeclType(I.getType()->castAs<RecordType>()->getDecl()); 753 } 754 } 755 756 // Layout fields. 757 std::unique_ptr<CGRecordLayout> Layout = ComputeRecordLayout(RD, Ty); 758 CGRecordLayouts[Key] = std::move(Layout); 759 760 // If this struct blocked a FunctionType conversion, then recompute whatever 761 // was derived from that. 762 // FIXME: This is hugely overconservative. 763 if (SkippedLayout) 764 TypeCache.clear(); 765 766 return Ty; 767 } 768 769 /// getCGRecordLayout - Return record layout info for the given record decl. 770 const CGRecordLayout & 771 CodeGenTypes::getCGRecordLayout(const RecordDecl *RD) { 772 const Type *Key = Context.getTagDeclType(RD).getTypePtr(); 773 774 auto I = CGRecordLayouts.find(Key); 775 if (I != CGRecordLayouts.end()) 776 return *I->second; 777 // Compute the type information. 778 ConvertRecordDeclType(RD); 779 780 // Now try again. 781 I = CGRecordLayouts.find(Key); 782 783 assert(I != CGRecordLayouts.end() && 784 "Unable to find record layout information for type"); 785 return *I->second; 786 } 787 788 bool CodeGenTypes::isPointerZeroInitializable(QualType T) { 789 assert((T->isAnyPointerType() || T->isBlockPointerType()) && "Invalid type"); 790 return isZeroInitializable(T); 791 } 792 793 bool CodeGenTypes::isZeroInitializable(QualType T) { 794 if (T->getAs<PointerType>()) 795 return Context.getTargetNullPointerValue(T) == 0; 796 797 if (const auto *AT = Context.getAsArrayType(T)) { 798 if (isa<IncompleteArrayType>(AT)) 799 return true; 800 if (const auto *CAT = dyn_cast<ConstantArrayType>(AT)) 801 if (Context.getConstantArrayElementCount(CAT) == 0) 802 return true; 803 T = Context.getBaseElementType(T); 804 } 805 806 // Records are non-zero-initializable if they contain any 807 // non-zero-initializable subobjects. 808 if (const RecordType *RT = T->getAs<RecordType>()) { 809 const RecordDecl *RD = RT->getDecl(); 810 return isZeroInitializable(RD); 811 } 812 813 // We have to ask the ABI about member pointers. 814 if (const MemberPointerType *MPT = T->getAs<MemberPointerType>()) 815 return getCXXABI().isZeroInitializable(MPT); 816 817 // Everything else is okay. 818 return true; 819 } 820 821 bool CodeGenTypes::isZeroInitializable(const RecordDecl *RD) { 822 return getCGRecordLayout(RD).isZeroInitializable(); 823 } 824 825 unsigned CodeGenTypes::getTargetAddressSpace(QualType T) const { 826 // Return the address space for the type. If the type is a 827 // function type without an address space qualifier, the 828 // program address space is used. Otherwise, the target picks 829 // the best address space based on the type information 830 return T->isFunctionType() && !T.hasAddressSpace() 831 ? getDataLayout().getProgramAddressSpace() 832 : getContext().getTargetAddressSpace(T.getAddressSpace()); 833 } 834