ASTContext.cpp revision 4afa39deaa245592977136d367251ee2c173dd8d
1//===--- ASTContext.cpp - Context to hold long-lived AST nodes ------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the ASTContext interface. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/ASTContext.h" 15#include "clang/AST/DeclCXX.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/Expr.h" 18#include "clang/AST/RecordLayout.h" 19#include "clang/Basic/TargetInfo.h" 20#include "llvm/ADT/StringExtras.h" 21#include "llvm/Bitcode/Serialize.h" 22#include "llvm/Bitcode/Deserialize.h" 23#include "llvm/Support/MathExtras.h" 24 25using namespace clang; 26 27enum FloatingRank { 28 FloatRank, DoubleRank, LongDoubleRank 29}; 30 31ASTContext::ASTContext(const LangOptions& LOpts, SourceManager &SM, 32 TargetInfo &t, 33 IdentifierTable &idents, SelectorTable &sels, 34 unsigned size_reserve) : 35 CFConstantStringTypeDecl(0), ObjCFastEnumerationStateTypeDecl(0), 36 SourceMgr(SM), LangOpts(LOpts), Target(t), 37 Idents(idents), Selectors(sels) 38{ 39 if (size_reserve > 0) Types.reserve(size_reserve); 40 InitBuiltinTypes(); 41 BuiltinInfo.InitializeBuiltins(idents, Target); 42 TUDecl = TranslationUnitDecl::Create(*this); 43} 44 45ASTContext::~ASTContext() { 46 // Deallocate all the types. 47 while (!Types.empty()) { 48 Types.back()->Destroy(*this); 49 Types.pop_back(); 50 } 51 52 { 53 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*>::iterator 54 I = ASTRecordLayouts.begin(), E = ASTRecordLayouts.end(); 55 while (I != E) { 56 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 57 delete R; 58 } 59 } 60 61 { 62 llvm::DenseMap<const ObjCInterfaceDecl*, const ASTRecordLayout*>::iterator 63 I = ASTObjCInterfaces.begin(), E = ASTObjCInterfaces.end(); 64 while (I != E) { 65 ASTRecordLayout *R = const_cast<ASTRecordLayout*>((I++)->second); 66 delete R; 67 } 68 } 69 70 { 71 llvm::DenseMap<const ObjCInterfaceDecl*, const RecordDecl*>::iterator 72 I = ASTRecordForInterface.begin(), E = ASTRecordForInterface.end(); 73 while (I != E) { 74 RecordDecl *R = const_cast<RecordDecl*>((I++)->second); 75 R->Destroy(*this); 76 } 77 } 78 79 TUDecl->Destroy(*this); 80} 81 82void ASTContext::PrintStats() const { 83 fprintf(stderr, "*** AST Context Stats:\n"); 84 fprintf(stderr, " %d types total.\n", (int)Types.size()); 85 unsigned NumBuiltin = 0, NumPointer = 0, NumArray = 0, NumFunctionP = 0; 86 unsigned NumVector = 0, NumComplex = 0, NumBlockPointer = 0; 87 unsigned NumFunctionNP = 0, NumTypeName = 0, NumTagged = 0, NumReference = 0; 88 89 unsigned NumTagStruct = 0, NumTagUnion = 0, NumTagEnum = 0, NumTagClass = 0; 90 unsigned NumObjCInterfaces = 0, NumObjCQualifiedInterfaces = 0; 91 unsigned NumObjCQualifiedIds = 0; 92 unsigned NumTypeOfTypes = 0, NumTypeOfExprs = 0; 93 94 for (unsigned i = 0, e = Types.size(); i != e; ++i) { 95 Type *T = Types[i]; 96 if (isa<BuiltinType>(T)) 97 ++NumBuiltin; 98 else if (isa<PointerType>(T)) 99 ++NumPointer; 100 else if (isa<BlockPointerType>(T)) 101 ++NumBlockPointer; 102 else if (isa<ReferenceType>(T)) 103 ++NumReference; 104 else if (isa<ComplexType>(T)) 105 ++NumComplex; 106 else if (isa<ArrayType>(T)) 107 ++NumArray; 108 else if (isa<VectorType>(T)) 109 ++NumVector; 110 else if (isa<FunctionTypeNoProto>(T)) 111 ++NumFunctionNP; 112 else if (isa<FunctionTypeProto>(T)) 113 ++NumFunctionP; 114 else if (isa<TypedefType>(T)) 115 ++NumTypeName; 116 else if (TagType *TT = dyn_cast<TagType>(T)) { 117 ++NumTagged; 118 switch (TT->getDecl()->getTagKind()) { 119 default: assert(0 && "Unknown tagged type!"); 120 case TagDecl::TK_struct: ++NumTagStruct; break; 121 case TagDecl::TK_union: ++NumTagUnion; break; 122 case TagDecl::TK_class: ++NumTagClass; break; 123 case TagDecl::TK_enum: ++NumTagEnum; break; 124 } 125 } else if (isa<ObjCInterfaceType>(T)) 126 ++NumObjCInterfaces; 127 else if (isa<ObjCQualifiedInterfaceType>(T)) 128 ++NumObjCQualifiedInterfaces; 129 else if (isa<ObjCQualifiedIdType>(T)) 130 ++NumObjCQualifiedIds; 131 else if (isa<TypeOfType>(T)) 132 ++NumTypeOfTypes; 133 else if (isa<TypeOfExpr>(T)) 134 ++NumTypeOfExprs; 135 else { 136 QualType(T, 0).dump(); 137 assert(0 && "Unknown type!"); 138 } 139 } 140 141 fprintf(stderr, " %d builtin types\n", NumBuiltin); 142 fprintf(stderr, " %d pointer types\n", NumPointer); 143 fprintf(stderr, " %d block pointer types\n", NumBlockPointer); 144 fprintf(stderr, " %d reference types\n", NumReference); 145 fprintf(stderr, " %d complex types\n", NumComplex); 146 fprintf(stderr, " %d array types\n", NumArray); 147 fprintf(stderr, " %d vector types\n", NumVector); 148 fprintf(stderr, " %d function types with proto\n", NumFunctionP); 149 fprintf(stderr, " %d function types with no proto\n", NumFunctionNP); 150 fprintf(stderr, " %d typename (typedef) types\n", NumTypeName); 151 fprintf(stderr, " %d tagged types\n", NumTagged); 152 fprintf(stderr, " %d struct types\n", NumTagStruct); 153 fprintf(stderr, " %d union types\n", NumTagUnion); 154 fprintf(stderr, " %d class types\n", NumTagClass); 155 fprintf(stderr, " %d enum types\n", NumTagEnum); 156 fprintf(stderr, " %d interface types\n", NumObjCInterfaces); 157 fprintf(stderr, " %d protocol qualified interface types\n", 158 NumObjCQualifiedInterfaces); 159 fprintf(stderr, " %d protocol qualified id types\n", 160 NumObjCQualifiedIds); 161 fprintf(stderr, " %d typeof types\n", NumTypeOfTypes); 162 fprintf(stderr, " %d typeof exprs\n", NumTypeOfExprs); 163 164 fprintf(stderr, "Total bytes = %d\n", int(NumBuiltin*sizeof(BuiltinType)+ 165 NumPointer*sizeof(PointerType)+NumArray*sizeof(ArrayType)+ 166 NumComplex*sizeof(ComplexType)+NumVector*sizeof(VectorType)+ 167 NumFunctionP*sizeof(FunctionTypeProto)+ 168 NumFunctionNP*sizeof(FunctionTypeNoProto)+ 169 NumTypeName*sizeof(TypedefType)+NumTagged*sizeof(TagType)+ 170 NumTypeOfTypes*sizeof(TypeOfType)+NumTypeOfExprs*sizeof(TypeOfExpr))); 171} 172 173 174void ASTContext::InitBuiltinType(QualType &R, BuiltinType::Kind K) { 175 void *Mem = Allocator.Allocate(sizeof(BuiltinType), 8); 176 Types.push_back((R = QualType(new (Mem) BuiltinType(K),0)).getTypePtr()); 177} 178 179void ASTContext::InitBuiltinTypes() { 180 assert(VoidTy.isNull() && "Context reinitialized?"); 181 182 // C99 6.2.5p19. 183 InitBuiltinType(VoidTy, BuiltinType::Void); 184 185 // C99 6.2.5p2. 186 InitBuiltinType(BoolTy, BuiltinType::Bool); 187 // C99 6.2.5p3. 188 if (Target.isCharSigned()) 189 InitBuiltinType(CharTy, BuiltinType::Char_S); 190 else 191 InitBuiltinType(CharTy, BuiltinType::Char_U); 192 // C99 6.2.5p4. 193 InitBuiltinType(SignedCharTy, BuiltinType::SChar); 194 InitBuiltinType(ShortTy, BuiltinType::Short); 195 InitBuiltinType(IntTy, BuiltinType::Int); 196 InitBuiltinType(LongTy, BuiltinType::Long); 197 InitBuiltinType(LongLongTy, BuiltinType::LongLong); 198 199 // C99 6.2.5p6. 200 InitBuiltinType(UnsignedCharTy, BuiltinType::UChar); 201 InitBuiltinType(UnsignedShortTy, BuiltinType::UShort); 202 InitBuiltinType(UnsignedIntTy, BuiltinType::UInt); 203 InitBuiltinType(UnsignedLongTy, BuiltinType::ULong); 204 InitBuiltinType(UnsignedLongLongTy, BuiltinType::ULongLong); 205 206 // C99 6.2.5p10. 207 InitBuiltinType(FloatTy, BuiltinType::Float); 208 InitBuiltinType(DoubleTy, BuiltinType::Double); 209 InitBuiltinType(LongDoubleTy, BuiltinType::LongDouble); 210 211 // C++ 3.9.1p5 212 InitBuiltinType(WCharTy, BuiltinType::WChar); 213 214 // Placeholder type for functions. 215 InitBuiltinType(OverloadTy, BuiltinType::Overload); 216 217 // Placeholder type for type-dependent expressions whose type is 218 // completely unknown. No code should ever check a type against 219 // DependentTy and users should never see it; however, it is here to 220 // help diagnose failures to properly check for type-dependent 221 // expressions. 222 InitBuiltinType(DependentTy, BuiltinType::Dependent); 223 224 // C99 6.2.5p11. 225 FloatComplexTy = getComplexType(FloatTy); 226 DoubleComplexTy = getComplexType(DoubleTy); 227 LongDoubleComplexTy = getComplexType(LongDoubleTy); 228 229 BuiltinVaListType = QualType(); 230 ObjCIdType = QualType(); 231 IdStructType = 0; 232 ObjCClassType = QualType(); 233 ClassStructType = 0; 234 235 ObjCConstantStringType = QualType(); 236 237 // void * type 238 VoidPtrTy = getPointerType(VoidTy); 239} 240 241//===----------------------------------------------------------------------===// 242// Type Sizing and Analysis 243//===----------------------------------------------------------------------===// 244 245/// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 246/// scalar floating point type. 247const llvm::fltSemantics &ASTContext::getFloatTypeSemantics(QualType T) const { 248 const BuiltinType *BT = T->getAsBuiltinType(); 249 assert(BT && "Not a floating point type!"); 250 switch (BT->getKind()) { 251 default: assert(0 && "Not a floating point type!"); 252 case BuiltinType::Float: return Target.getFloatFormat(); 253 case BuiltinType::Double: return Target.getDoubleFormat(); 254 case BuiltinType::LongDouble: return Target.getLongDoubleFormat(); 255 } 256} 257 258 259/// getTypeSize - Return the size of the specified type, in bits. This method 260/// does not work on incomplete types. 261std::pair<uint64_t, unsigned> 262ASTContext::getTypeInfo(const Type *T) { 263 T = getCanonicalType(T); 264 uint64_t Width; 265 unsigned Align; 266 switch (T->getTypeClass()) { 267 case Type::TypeName: assert(0 && "Not a canonical type!"); 268 case Type::FunctionNoProto: 269 case Type::FunctionProto: 270 default: 271 assert(0 && "Incomplete types have no size!"); 272 case Type::VariableArray: 273 assert(0 && "VLAs not implemented yet!"); 274 case Type::DependentSizedArray: 275 assert(0 && "Dependently-sized arrays don't have a known size"); 276 case Type::ConstantArray: { 277 const ConstantArrayType *CAT = cast<ConstantArrayType>(T); 278 279 std::pair<uint64_t, unsigned> EltInfo = getTypeInfo(CAT->getElementType()); 280 Width = EltInfo.first*CAT->getSize().getZExtValue(); 281 Align = EltInfo.second; 282 break; 283 } 284 case Type::ExtVector: 285 case Type::Vector: { 286 std::pair<uint64_t, unsigned> EltInfo = 287 getTypeInfo(cast<VectorType>(T)->getElementType()); 288 Width = EltInfo.first*cast<VectorType>(T)->getNumElements(); 289 Align = Width; 290 // If the alignment is not a power of 2, round up to the next power of 2. 291 // This happens for non-power-of-2 length vectors. 292 // FIXME: this should probably be a target property. 293 Align = 1 << llvm::Log2_32_Ceil(Align); 294 break; 295 } 296 297 case Type::Builtin: 298 switch (cast<BuiltinType>(T)->getKind()) { 299 default: assert(0 && "Unknown builtin type!"); 300 case BuiltinType::Void: 301 assert(0 && "Incomplete types have no size!"); 302 case BuiltinType::Bool: 303 Width = Target.getBoolWidth(); 304 Align = Target.getBoolAlign(); 305 break; 306 case BuiltinType::Char_S: 307 case BuiltinType::Char_U: 308 case BuiltinType::UChar: 309 case BuiltinType::SChar: 310 Width = Target.getCharWidth(); 311 Align = Target.getCharAlign(); 312 break; 313 case BuiltinType::WChar: 314 Width = Target.getWCharWidth(); 315 Align = Target.getWCharAlign(); 316 break; 317 case BuiltinType::UShort: 318 case BuiltinType::Short: 319 Width = Target.getShortWidth(); 320 Align = Target.getShortAlign(); 321 break; 322 case BuiltinType::UInt: 323 case BuiltinType::Int: 324 Width = Target.getIntWidth(); 325 Align = Target.getIntAlign(); 326 break; 327 case BuiltinType::ULong: 328 case BuiltinType::Long: 329 Width = Target.getLongWidth(); 330 Align = Target.getLongAlign(); 331 break; 332 case BuiltinType::ULongLong: 333 case BuiltinType::LongLong: 334 Width = Target.getLongLongWidth(); 335 Align = Target.getLongLongAlign(); 336 break; 337 case BuiltinType::Float: 338 Width = Target.getFloatWidth(); 339 Align = Target.getFloatAlign(); 340 break; 341 case BuiltinType::Double: 342 Width = Target.getDoubleWidth(); 343 Align = Target.getDoubleAlign(); 344 break; 345 case BuiltinType::LongDouble: 346 Width = Target.getLongDoubleWidth(); 347 Align = Target.getLongDoubleAlign(); 348 break; 349 } 350 break; 351 case Type::ASQual: 352 // FIXME: Pointers into different addr spaces could have different sizes and 353 // alignment requirements: getPointerInfo should take an AddrSpace. 354 return getTypeInfo(QualType(cast<ASQualType>(T)->getBaseType(), 0)); 355 case Type::ObjCQualifiedId: 356 Width = Target.getPointerWidth(0); 357 Align = Target.getPointerAlign(0); 358 break; 359 case Type::BlockPointer: { 360 unsigned AS = cast<BlockPointerType>(T)->getPointeeType().getAddressSpace(); 361 Width = Target.getPointerWidth(AS); 362 Align = Target.getPointerAlign(AS); 363 break; 364 } 365 case Type::Pointer: { 366 unsigned AS = cast<PointerType>(T)->getPointeeType().getAddressSpace(); 367 Width = Target.getPointerWidth(AS); 368 Align = Target.getPointerAlign(AS); 369 break; 370 } 371 case Type::Reference: 372 // "When applied to a reference or a reference type, the result is the size 373 // of the referenced type." C++98 5.3.3p2: expr.sizeof. 374 // FIXME: This is wrong for struct layout: a reference in a struct has 375 // pointer size. 376 return getTypeInfo(cast<ReferenceType>(T)->getPointeeType()); 377 378 case Type::Complex: { 379 // Complex types have the same alignment as their elements, but twice the 380 // size. 381 std::pair<uint64_t, unsigned> EltInfo = 382 getTypeInfo(cast<ComplexType>(T)->getElementType()); 383 Width = EltInfo.first*2; 384 Align = EltInfo.second; 385 break; 386 } 387 case Type::ObjCInterface: { 388 const ObjCInterfaceType *ObjCI = cast<ObjCInterfaceType>(T); 389 const ASTRecordLayout &Layout = getASTObjCInterfaceLayout(ObjCI->getDecl()); 390 Width = Layout.getSize(); 391 Align = Layout.getAlignment(); 392 break; 393 } 394 case Type::Tagged: { 395 const TagType *TT = cast<TagType>(T); 396 397 if (TT->getDecl()->isInvalidDecl()) { 398 Width = 1; 399 Align = 1; 400 break; 401 } 402 403 if (const EnumType *ET = dyn_cast<EnumType>(TT)) 404 return getTypeInfo(ET->getDecl()->getIntegerType()); 405 406 const RecordType *RT = cast<RecordType>(TT); 407 const ASTRecordLayout &Layout = getASTRecordLayout(RT->getDecl()); 408 Width = Layout.getSize(); 409 Align = Layout.getAlignment(); 410 break; 411 } 412 } 413 414 assert(Align && (Align & (Align-1)) == 0 && "Alignment must be power of 2"); 415 return std::make_pair(Width, Align); 416} 417 418/// LayoutField - Field layout. 419void ASTRecordLayout::LayoutField(const FieldDecl *FD, unsigned FieldNo, 420 bool IsUnion, unsigned StructPacking, 421 ASTContext &Context) { 422 unsigned FieldPacking = StructPacking; 423 uint64_t FieldOffset = IsUnion ? 0 : Size; 424 uint64_t FieldSize; 425 unsigned FieldAlign; 426 427 // FIXME: Should this override struct packing? Probably we want to 428 // take the minimum? 429 if (const PackedAttr *PA = FD->getAttr<PackedAttr>()) 430 FieldPacking = PA->getAlignment(); 431 432 if (const Expr *BitWidthExpr = FD->getBitWidth()) { 433 // TODO: Need to check this algorithm on other targets! 434 // (tested on Linux-X86) 435 FieldSize = 436 BitWidthExpr->getIntegerConstantExprValue(Context).getZExtValue(); 437 438 std::pair<uint64_t, unsigned> FieldInfo = 439 Context.getTypeInfo(FD->getType()); 440 uint64_t TypeSize = FieldInfo.first; 441 442 // Determine the alignment of this bitfield. The packing 443 // attributes define a maximum and the alignment attribute defines 444 // a minimum. 445 // FIXME: What is the right behavior when the specified alignment 446 // is smaller than the specified packing? 447 FieldAlign = FieldInfo.second; 448 if (FieldPacking) 449 FieldAlign = std::min(FieldAlign, FieldPacking); 450 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>()) 451 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 452 453 // Check if we need to add padding to give the field the correct 454 // alignment. 455 if (FieldSize == 0 || (FieldOffset & (FieldAlign-1)) + FieldSize > TypeSize) 456 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 457 458 // Padding members don't affect overall alignment 459 if (!FD->getIdentifier()) 460 FieldAlign = 1; 461 } else { 462 if (FD->getType()->isIncompleteArrayType()) { 463 // This is a flexible array member; we can't directly 464 // query getTypeInfo about these, so we figure it out here. 465 // Flexible array members don't have any size, but they 466 // have to be aligned appropriately for their element type. 467 FieldSize = 0; 468 const ArrayType* ATy = Context.getAsArrayType(FD->getType()); 469 FieldAlign = Context.getTypeAlign(ATy->getElementType()); 470 } else { 471 std::pair<uint64_t, unsigned> FieldInfo = 472 Context.getTypeInfo(FD->getType()); 473 FieldSize = FieldInfo.first; 474 FieldAlign = FieldInfo.second; 475 } 476 477 // Determine the alignment of this bitfield. The packing 478 // attributes define a maximum and the alignment attribute defines 479 // a minimum. Additionally, the packing alignment must be at least 480 // a byte for non-bitfields. 481 // 482 // FIXME: What is the right behavior when the specified alignment 483 // is smaller than the specified packing? 484 if (FieldPacking) 485 FieldAlign = std::min(FieldAlign, std::max(8U, FieldPacking)); 486 if (const AlignedAttr *AA = FD->getAttr<AlignedAttr>()) 487 FieldAlign = std::max(FieldAlign, AA->getAlignment()); 488 489 // Round up the current record size to the field's alignment boundary. 490 FieldOffset = (FieldOffset + (FieldAlign-1)) & ~(FieldAlign-1); 491 } 492 493 // Place this field at the current location. 494 FieldOffsets[FieldNo] = FieldOffset; 495 496 // Reserve space for this field. 497 if (IsUnion) { 498 Size = std::max(Size, FieldSize); 499 } else { 500 Size = FieldOffset + FieldSize; 501 } 502 503 // Remember max struct/class alignment. 504 Alignment = std::max(Alignment, FieldAlign); 505} 506 507static void CollectObjCIvars(const ObjCInterfaceDecl *OI, 508 std::vector<FieldDecl*> &Fields) { 509 const ObjCInterfaceDecl *SuperClass = OI->getSuperClass(); 510 if (SuperClass) 511 CollectObjCIvars(SuperClass, Fields); 512 for (ObjCInterfaceDecl::ivar_iterator I = OI->ivar_begin(), 513 E = OI->ivar_end(); I != E; ++I) { 514 ObjCIvarDecl *IVDecl = (*I); 515 if (!IVDecl->isInvalidDecl()) 516 Fields.push_back(cast<FieldDecl>(IVDecl)); 517 } 518} 519 520/// addRecordToClass - produces record info. for the class for its 521/// ivars and all those inherited. 522/// 523const RecordDecl *ASTContext::addRecordToClass(const ObjCInterfaceDecl *D) 524{ 525 const RecordDecl *&RD = ASTRecordForInterface[D]; 526 if (RD) 527 return RD; 528 std::vector<FieldDecl*> RecFields; 529 CollectObjCIvars(D, RecFields); 530 RecordDecl *NewRD = RecordDecl::Create(*this, TagDecl::TK_struct, 0, 531 D->getLocation(), 532 D->getIdentifier()); 533 /// FIXME! Can do collection of ivars and adding to the record while 534 /// doing it. 535 for (unsigned int i = 0; i != RecFields.size(); i++) { 536 FieldDecl *Field = FieldDecl::Create(*this, NewRD, 537 RecFields[i]->getLocation(), 538 RecFields[i]->getIdentifier(), 539 RecFields[i]->getType(), 540 RecFields[i]->getBitWidth(), false); 541 NewRD->addDecl(Field); 542 } 543 NewRD->completeDefinition(*this); 544 RD = NewRD; 545 return RD; 546} 547 548/// setFieldDecl - maps a field for the given Ivar reference node. 549// 550void ASTContext::setFieldDecl(const ObjCInterfaceDecl *OI, 551 const ObjCIvarDecl *Ivar, 552 const ObjCIvarRefExpr *MRef) { 553 FieldDecl *FD = (const_cast<ObjCInterfaceDecl *>(OI))-> 554 lookupFieldDeclForIvar(*this, Ivar); 555 ASTFieldForIvarRef[MRef] = FD; 556} 557 558/// getASTObjcInterfaceLayout - Get or compute information about the layout of 559/// the specified Objective C, which indicates its size and ivar 560/// position information. 561const ASTRecordLayout & 562ASTContext::getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D) { 563 // Look up this layout, if already laid out, return what we have. 564 const ASTRecordLayout *&Entry = ASTObjCInterfaces[D]; 565 if (Entry) return *Entry; 566 567 // Allocate and assign into ASTRecordLayouts here. The "Entry" reference can 568 // be invalidated (dangle) if the ASTRecordLayouts hashtable is inserted into. 569 ASTRecordLayout *NewEntry = NULL; 570 unsigned FieldCount = D->ivar_size(); 571 if (ObjCInterfaceDecl *SD = D->getSuperClass()) { 572 FieldCount++; 573 const ASTRecordLayout &SL = getASTObjCInterfaceLayout(SD); 574 unsigned Alignment = SL.getAlignment(); 575 uint64_t Size = SL.getSize(); 576 NewEntry = new ASTRecordLayout(Size, Alignment); 577 NewEntry->InitializeLayout(FieldCount); 578 // Super class is at the beginning of the layout. 579 NewEntry->SetFieldOffset(0, 0); 580 } else { 581 NewEntry = new ASTRecordLayout(); 582 NewEntry->InitializeLayout(FieldCount); 583 } 584 Entry = NewEntry; 585 586 unsigned StructPacking = 0; 587 if (const PackedAttr *PA = D->getAttr<PackedAttr>()) 588 StructPacking = PA->getAlignment(); 589 590 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) 591 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 592 AA->getAlignment())); 593 594 // Layout each ivar sequentially. 595 unsigned i = 0; 596 for (ObjCInterfaceDecl::ivar_iterator IVI = D->ivar_begin(), 597 IVE = D->ivar_end(); IVI != IVE; ++IVI) { 598 const ObjCIvarDecl* Ivar = (*IVI); 599 NewEntry->LayoutField(Ivar, i++, false, StructPacking, *this); 600 } 601 602 // Finally, round the size of the total struct up to the alignment of the 603 // struct itself. 604 NewEntry->FinalizeLayout(); 605 return *NewEntry; 606} 607 608/// getASTRecordLayout - Get or compute information about the layout of the 609/// specified record (struct/union/class), which indicates its size and field 610/// position information. 611const ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 612 D = D->getDefinition(*this); 613 assert(D && "Cannot get layout of forward declarations!"); 614 615 // Look up this layout, if already laid out, return what we have. 616 const ASTRecordLayout *&Entry = ASTRecordLayouts[D]; 617 if (Entry) return *Entry; 618 619 // Allocate and assign into ASTRecordLayouts here. The "Entry" reference can 620 // be invalidated (dangle) if the ASTRecordLayouts hashtable is inserted into. 621 ASTRecordLayout *NewEntry = new ASTRecordLayout(); 622 Entry = NewEntry; 623 624 // FIXME: Avoid linear walk through the fields, if possible. 625 NewEntry->InitializeLayout(std::distance(D->field_begin(), D->field_end())); 626 bool IsUnion = D->isUnion(); 627 628 unsigned StructPacking = 0; 629 if (const PackedAttr *PA = D->getAttr<PackedAttr>()) 630 StructPacking = PA->getAlignment(); 631 632 if (const AlignedAttr *AA = D->getAttr<AlignedAttr>()) 633 NewEntry->SetAlignment(std::max(NewEntry->getAlignment(), 634 AA->getAlignment())); 635 636 // Layout each field, for now, just sequentially, respecting alignment. In 637 // the future, this will need to be tweakable by targets. 638 unsigned FieldIdx = 0; 639 for (RecordDecl::field_iterator Field = D->field_begin(), 640 FieldEnd = D->field_end(); 641 Field != FieldEnd; (void)++Field, ++FieldIdx) 642 NewEntry->LayoutField(*Field, FieldIdx, IsUnion, StructPacking, *this); 643 644 // Finally, round the size of the total struct up to the alignment of the 645 // struct itself. 646 NewEntry->FinalizeLayout(); 647 return *NewEntry; 648} 649 650//===----------------------------------------------------------------------===// 651// Type creation/memoization methods 652//===----------------------------------------------------------------------===// 653 654QualType ASTContext::getASQualType(QualType T, unsigned AddressSpace) { 655 QualType CanT = getCanonicalType(T); 656 if (CanT.getAddressSpace() == AddressSpace) 657 return T; 658 659 // Type's cannot have multiple ASQuals, therefore we know we only have to deal 660 // with CVR qualifiers from here on out. 661 assert(CanT.getAddressSpace() == 0 && 662 "Type is already address space qualified"); 663 664 // Check if we've already instantiated an address space qual'd type of this 665 // type. 666 llvm::FoldingSetNodeID ID; 667 ASQualType::Profile(ID, T.getTypePtr(), AddressSpace); 668 void *InsertPos = 0; 669 if (ASQualType *ASQy = ASQualTypes.FindNodeOrInsertPos(ID, InsertPos)) 670 return QualType(ASQy, 0); 671 672 // If the base type isn't canonical, this won't be a canonical type either, 673 // so fill in the canonical type field. 674 QualType Canonical; 675 if (!T->isCanonical()) { 676 Canonical = getASQualType(CanT, AddressSpace); 677 678 // Get the new insert position for the node we care about. 679 ASQualType *NewIP = ASQualTypes.FindNodeOrInsertPos(ID, InsertPos); 680 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 681 } 682 void *Mem = Allocator.Allocate(sizeof(ASQualType), 8); 683 ASQualType *New = new (Mem) ASQualType(T.getTypePtr(), Canonical, AddressSpace); 684 ASQualTypes.InsertNode(New, InsertPos); 685 Types.push_back(New); 686 return QualType(New, T.getCVRQualifiers()); 687} 688 689 690/// getComplexType - Return the uniqued reference to the type for a complex 691/// number with the specified element type. 692QualType ASTContext::getComplexType(QualType T) { 693 // Unique pointers, to guarantee there is only one pointer of a particular 694 // structure. 695 llvm::FoldingSetNodeID ID; 696 ComplexType::Profile(ID, T); 697 698 void *InsertPos = 0; 699 if (ComplexType *CT = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos)) 700 return QualType(CT, 0); 701 702 // If the pointee type isn't canonical, this won't be a canonical type either, 703 // so fill in the canonical type field. 704 QualType Canonical; 705 if (!T->isCanonical()) { 706 Canonical = getComplexType(getCanonicalType(T)); 707 708 // Get the new insert position for the node we care about. 709 ComplexType *NewIP = ComplexTypes.FindNodeOrInsertPos(ID, InsertPos); 710 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 711 } 712 void *Mem = Allocator.Allocate(sizeof(ComplexType), 8); 713 ComplexType *New = new (Mem) ComplexType(T, Canonical); 714 Types.push_back(New); 715 ComplexTypes.InsertNode(New, InsertPos); 716 return QualType(New, 0); 717} 718 719 720/// getPointerType - Return the uniqued reference to the type for a pointer to 721/// the specified type. 722QualType ASTContext::getPointerType(QualType T) { 723 // Unique pointers, to guarantee there is only one pointer of a particular 724 // structure. 725 llvm::FoldingSetNodeID ID; 726 PointerType::Profile(ID, T); 727 728 void *InsertPos = 0; 729 if (PointerType *PT = PointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 730 return QualType(PT, 0); 731 732 // If the pointee type isn't canonical, this won't be a canonical type either, 733 // so fill in the canonical type field. 734 QualType Canonical; 735 if (!T->isCanonical()) { 736 Canonical = getPointerType(getCanonicalType(T)); 737 738 // Get the new insert position for the node we care about. 739 PointerType *NewIP = PointerTypes.FindNodeOrInsertPos(ID, InsertPos); 740 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 741 } 742 void *Mem = Allocator.Allocate(sizeof(PointerType), 8); 743 PointerType *New = new (Mem) PointerType(T, Canonical); 744 Types.push_back(New); 745 PointerTypes.InsertNode(New, InsertPos); 746 return QualType(New, 0); 747} 748 749/// getBlockPointerType - Return the uniqued reference to the type for 750/// a pointer to the specified block. 751QualType ASTContext::getBlockPointerType(QualType T) { 752 assert(T->isFunctionType() && "block of function types only"); 753 // Unique pointers, to guarantee there is only one block of a particular 754 // structure. 755 llvm::FoldingSetNodeID ID; 756 BlockPointerType::Profile(ID, T); 757 758 void *InsertPos = 0; 759 if (BlockPointerType *PT = 760 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos)) 761 return QualType(PT, 0); 762 763 // If the block pointee type isn't canonical, this won't be a canonical 764 // type either so fill in the canonical type field. 765 QualType Canonical; 766 if (!T->isCanonical()) { 767 Canonical = getBlockPointerType(getCanonicalType(T)); 768 769 // Get the new insert position for the node we care about. 770 BlockPointerType *NewIP = 771 BlockPointerTypes.FindNodeOrInsertPos(ID, InsertPos); 772 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 773 } 774 void *Mem = Allocator.Allocate(sizeof(BlockPointerType), 8); 775 BlockPointerType *New = new (Mem) BlockPointerType(T, Canonical); 776 Types.push_back(New); 777 BlockPointerTypes.InsertNode(New, InsertPos); 778 return QualType(New, 0); 779} 780 781/// getReferenceType - Return the uniqued reference to the type for a reference 782/// to the specified type. 783QualType ASTContext::getReferenceType(QualType T) { 784 // Unique pointers, to guarantee there is only one pointer of a particular 785 // structure. 786 llvm::FoldingSetNodeID ID; 787 ReferenceType::Profile(ID, T); 788 789 void *InsertPos = 0; 790 if (ReferenceType *RT = ReferenceTypes.FindNodeOrInsertPos(ID, InsertPos)) 791 return QualType(RT, 0); 792 793 // If the referencee type isn't canonical, this won't be a canonical type 794 // either, so fill in the canonical type field. 795 QualType Canonical; 796 if (!T->isCanonical()) { 797 Canonical = getReferenceType(getCanonicalType(T)); 798 799 // Get the new insert position for the node we care about. 800 ReferenceType *NewIP = ReferenceTypes.FindNodeOrInsertPos(ID, InsertPos); 801 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 802 } 803 804 void *Mem = Allocator.Allocate(sizeof(ReferenceType), 8); 805 ReferenceType *New = new (Mem) ReferenceType(T, Canonical); 806 Types.push_back(New); 807 ReferenceTypes.InsertNode(New, InsertPos); 808 return QualType(New, 0); 809} 810 811/// getConstantArrayType - Return the unique reference to the type for an 812/// array of the specified element type. 813QualType ASTContext::getConstantArrayType(QualType EltTy, 814 const llvm::APInt &ArySize, 815 ArrayType::ArraySizeModifier ASM, 816 unsigned EltTypeQuals) { 817 llvm::FoldingSetNodeID ID; 818 ConstantArrayType::Profile(ID, EltTy, ArySize); 819 820 void *InsertPos = 0; 821 if (ConstantArrayType *ATP = 822 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 823 return QualType(ATP, 0); 824 825 // If the element type isn't canonical, this won't be a canonical type either, 826 // so fill in the canonical type field. 827 QualType Canonical; 828 if (!EltTy->isCanonical()) { 829 Canonical = getConstantArrayType(getCanonicalType(EltTy), ArySize, 830 ASM, EltTypeQuals); 831 // Get the new insert position for the node we care about. 832 ConstantArrayType *NewIP = 833 ConstantArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 834 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 835 } 836 837 void *Mem = Allocator.Allocate(sizeof(ConstantArrayType), 8); 838 ConstantArrayType *New = 839 new (Mem) ConstantArrayType(EltTy, Canonical, ArySize, ASM, EltTypeQuals); 840 ConstantArrayTypes.InsertNode(New, InsertPos); 841 Types.push_back(New); 842 return QualType(New, 0); 843} 844 845/// getVariableArrayType - Returns a non-unique reference to the type for a 846/// variable array of the specified element type. 847QualType ASTContext::getVariableArrayType(QualType EltTy, Expr *NumElts, 848 ArrayType::ArraySizeModifier ASM, 849 unsigned EltTypeQuals) { 850 // Since we don't unique expressions, it isn't possible to unique VLA's 851 // that have an expression provided for their size. 852 853 void *Mem = Allocator.Allocate(sizeof(VariableArrayType), 8); 854 VariableArrayType *New = 855 new (Mem) VariableArrayType(EltTy, QualType(), NumElts, ASM, EltTypeQuals); 856 857 VariableArrayTypes.push_back(New); 858 Types.push_back(New); 859 return QualType(New, 0); 860} 861 862/// getDependentSizedArrayType - Returns a non-unique reference to 863/// the type for a dependently-sized array of the specified element 864/// type. FIXME: We will need these to be uniqued, or at least 865/// comparable, at some point. 866QualType ASTContext::getDependentSizedArrayType(QualType EltTy, Expr *NumElts, 867 ArrayType::ArraySizeModifier ASM, 868 unsigned EltTypeQuals) { 869 assert((NumElts->isTypeDependent() || NumElts->isValueDependent()) && 870 "Size must be type- or value-dependent!"); 871 872 // Since we don't unique expressions, it isn't possible to unique 873 // dependently-sized array types. 874 875 void *Mem = Allocator.Allocate(sizeof(DependentSizedArrayType), 8); 876 DependentSizedArrayType *New = 877 new (Mem) DependentSizedArrayType(EltTy, QualType(), NumElts, 878 ASM, EltTypeQuals); 879 880 DependentSizedArrayTypes.push_back(New); 881 Types.push_back(New); 882 return QualType(New, 0); 883} 884 885QualType ASTContext::getIncompleteArrayType(QualType EltTy, 886 ArrayType::ArraySizeModifier ASM, 887 unsigned EltTypeQuals) { 888 llvm::FoldingSetNodeID ID; 889 IncompleteArrayType::Profile(ID, EltTy); 890 891 void *InsertPos = 0; 892 if (IncompleteArrayType *ATP = 893 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos)) 894 return QualType(ATP, 0); 895 896 // If the element type isn't canonical, this won't be a canonical type 897 // either, so fill in the canonical type field. 898 QualType Canonical; 899 900 if (!EltTy->isCanonical()) { 901 Canonical = getIncompleteArrayType(getCanonicalType(EltTy), 902 ASM, EltTypeQuals); 903 904 // Get the new insert position for the node we care about. 905 IncompleteArrayType *NewIP = 906 IncompleteArrayTypes.FindNodeOrInsertPos(ID, InsertPos); 907 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 908 } 909 910 void *Mem = Allocator.Allocate(sizeof(IncompleteArrayType), 8); 911 IncompleteArrayType *New = new (Mem) IncompleteArrayType(EltTy, Canonical, 912 ASM, EltTypeQuals); 913 914 IncompleteArrayTypes.InsertNode(New, InsertPos); 915 Types.push_back(New); 916 return QualType(New, 0); 917} 918 919/// getVectorType - Return the unique reference to a vector type of 920/// the specified element type and size. VectorType must be a built-in type. 921QualType ASTContext::getVectorType(QualType vecType, unsigned NumElts) { 922 BuiltinType *baseType; 923 924 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 925 assert(baseType != 0 && "getVectorType(): Expecting a built-in type"); 926 927 // Check if we've already instantiated a vector of this type. 928 llvm::FoldingSetNodeID ID; 929 VectorType::Profile(ID, vecType, NumElts, Type::Vector); 930 void *InsertPos = 0; 931 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 932 return QualType(VTP, 0); 933 934 // If the element type isn't canonical, this won't be a canonical type either, 935 // so fill in the canonical type field. 936 QualType Canonical; 937 if (!vecType->isCanonical()) { 938 Canonical = getVectorType(getCanonicalType(vecType), NumElts); 939 940 // Get the new insert position for the node we care about. 941 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 942 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 943 } 944 void *Mem = Allocator.Allocate(sizeof(VectorType), 8); 945 VectorType *New = new (Mem) VectorType(vecType, NumElts, Canonical); 946 VectorTypes.InsertNode(New, InsertPos); 947 Types.push_back(New); 948 return QualType(New, 0); 949} 950 951/// getExtVectorType - Return the unique reference to an extended vector type of 952/// the specified element type and size. VectorType must be a built-in type. 953QualType ASTContext::getExtVectorType(QualType vecType, unsigned NumElts) { 954 BuiltinType *baseType; 955 956 baseType = dyn_cast<BuiltinType>(getCanonicalType(vecType).getTypePtr()); 957 assert(baseType != 0 && "getExtVectorType(): Expecting a built-in type"); 958 959 // Check if we've already instantiated a vector of this type. 960 llvm::FoldingSetNodeID ID; 961 VectorType::Profile(ID, vecType, NumElts, Type::ExtVector); 962 void *InsertPos = 0; 963 if (VectorType *VTP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos)) 964 return QualType(VTP, 0); 965 966 // If the element type isn't canonical, this won't be a canonical type either, 967 // so fill in the canonical type field. 968 QualType Canonical; 969 if (!vecType->isCanonical()) { 970 Canonical = getExtVectorType(getCanonicalType(vecType), NumElts); 971 972 // Get the new insert position for the node we care about. 973 VectorType *NewIP = VectorTypes.FindNodeOrInsertPos(ID, InsertPos); 974 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 975 } 976 void *Mem = Allocator.Allocate(sizeof(ExtVectorType), 8); 977 ExtVectorType *New = new (Mem) ExtVectorType(vecType, NumElts, Canonical); 978 VectorTypes.InsertNode(New, InsertPos); 979 Types.push_back(New); 980 return QualType(New, 0); 981} 982 983/// getFunctionTypeNoProto - Return a K&R style C function type like 'int()'. 984/// 985QualType ASTContext::getFunctionTypeNoProto(QualType ResultTy) { 986 // Unique functions, to guarantee there is only one function of a particular 987 // structure. 988 llvm::FoldingSetNodeID ID; 989 FunctionTypeNoProto::Profile(ID, ResultTy); 990 991 void *InsertPos = 0; 992 if (FunctionTypeNoProto *FT = 993 FunctionTypeNoProtos.FindNodeOrInsertPos(ID, InsertPos)) 994 return QualType(FT, 0); 995 996 QualType Canonical; 997 if (!ResultTy->isCanonical()) { 998 Canonical = getFunctionTypeNoProto(getCanonicalType(ResultTy)); 999 1000 // Get the new insert position for the node we care about. 1001 FunctionTypeNoProto *NewIP = 1002 FunctionTypeNoProtos.FindNodeOrInsertPos(ID, InsertPos); 1003 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1004 } 1005 1006 FunctionTypeNoProto *New = new FunctionTypeNoProto(ResultTy, Canonical); 1007 Types.push_back(New); 1008 FunctionTypeNoProtos.InsertNode(New, InsertPos); 1009 return QualType(New, 0); 1010} 1011 1012/// getFunctionType - Return a normal function type with a typed argument 1013/// list. isVariadic indicates whether the argument list includes '...'. 1014QualType ASTContext::getFunctionType(QualType ResultTy,const QualType *ArgArray, 1015 unsigned NumArgs, bool isVariadic, 1016 unsigned TypeQuals) { 1017 // Unique functions, to guarantee there is only one function of a particular 1018 // structure. 1019 llvm::FoldingSetNodeID ID; 1020 FunctionTypeProto::Profile(ID, ResultTy, ArgArray, NumArgs, isVariadic, 1021 TypeQuals); 1022 1023 void *InsertPos = 0; 1024 if (FunctionTypeProto *FTP = 1025 FunctionTypeProtos.FindNodeOrInsertPos(ID, InsertPos)) 1026 return QualType(FTP, 0); 1027 1028 // Determine whether the type being created is already canonical or not. 1029 bool isCanonical = ResultTy->isCanonical(); 1030 for (unsigned i = 0; i != NumArgs && isCanonical; ++i) 1031 if (!ArgArray[i]->isCanonical()) 1032 isCanonical = false; 1033 1034 // If this type isn't canonical, get the canonical version of it. 1035 QualType Canonical; 1036 if (!isCanonical) { 1037 llvm::SmallVector<QualType, 16> CanonicalArgs; 1038 CanonicalArgs.reserve(NumArgs); 1039 for (unsigned i = 0; i != NumArgs; ++i) 1040 CanonicalArgs.push_back(getCanonicalType(ArgArray[i])); 1041 1042 Canonical = getFunctionType(getCanonicalType(ResultTy), 1043 &CanonicalArgs[0], NumArgs, 1044 isVariadic, TypeQuals); 1045 1046 // Get the new insert position for the node we care about. 1047 FunctionTypeProto *NewIP = 1048 FunctionTypeProtos.FindNodeOrInsertPos(ID, InsertPos); 1049 assert(NewIP == 0 && "Shouldn't be in the map!"); NewIP = NewIP; 1050 } 1051 1052 // FunctionTypeProto objects are allocated with extra bytes after them 1053 // for a variable size array (for parameter types) at the end of them. 1054 // FIXME: Can we do better than forcing a 16-byte alignment? 1055 FunctionTypeProto *FTP = 1056 (FunctionTypeProto*)Allocator.Allocate(sizeof(FunctionTypeProto) + 1057 NumArgs*sizeof(QualType), 16); 1058 new (FTP) FunctionTypeProto(ResultTy, ArgArray, NumArgs, isVariadic, 1059 TypeQuals, Canonical); 1060 Types.push_back(FTP); 1061 FunctionTypeProtos.InsertNode(FTP, InsertPos); 1062 return QualType(FTP, 0); 1063} 1064 1065/// getTypeDeclType - Return the unique reference to the type for the 1066/// specified type declaration. 1067QualType ASTContext::getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl) { 1068 assert(Decl && "Passed null for Decl param"); 1069 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1070 1071 if (TypedefDecl *Typedef = dyn_cast<TypedefDecl>(Decl)) 1072 return getTypedefType(Typedef); 1073 else if (TemplateTypeParmDecl *TP = dyn_cast<TemplateTypeParmDecl>(Decl)) 1074 return getTemplateTypeParmType(TP); 1075 else if (ObjCInterfaceDecl *ObjCInterface = dyn_cast<ObjCInterfaceDecl>(Decl)) 1076 return getObjCInterfaceType(ObjCInterface); 1077 1078 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Decl)) { 1079 if (PrevDecl) 1080 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1081 else { 1082 void *Mem = Allocator.Allocate(sizeof(CXXRecordType), 8); 1083 Decl->TypeForDecl = new (Mem) CXXRecordType(CXXRecord); 1084 } 1085 } 1086 else if (RecordDecl *Record = dyn_cast<RecordDecl>(Decl)) { 1087 if (PrevDecl) 1088 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1089 else { 1090 void *Mem = Allocator.Allocate(sizeof(RecordType), 8); 1091 Decl->TypeForDecl = new (Mem) RecordType(Record); 1092 } 1093 } 1094 else if (EnumDecl *Enum = dyn_cast<EnumDecl>(Decl)) { 1095 if (PrevDecl) 1096 Decl->TypeForDecl = PrevDecl->TypeForDecl; 1097 else { 1098 void *Mem = Allocator.Allocate(sizeof(EnumType), 8); 1099 Decl->TypeForDecl = new (Mem) EnumType(Enum); 1100 } 1101 } 1102 else 1103 assert(false && "TypeDecl without a type?"); 1104 1105 if (!PrevDecl) Types.push_back(Decl->TypeForDecl); 1106 return QualType(Decl->TypeForDecl, 0); 1107} 1108 1109/// getTypedefType - Return the unique reference to the type for the 1110/// specified typename decl. 1111QualType ASTContext::getTypedefType(TypedefDecl *Decl) { 1112 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1113 1114 QualType Canonical = getCanonicalType(Decl->getUnderlyingType()); 1115 void *Mem = Allocator.Allocate(sizeof(TypedefType), 8); 1116 Decl->TypeForDecl = new (Mem) TypedefType(Type::TypeName, Decl, Canonical); 1117 Types.push_back(Decl->TypeForDecl); 1118 return QualType(Decl->TypeForDecl, 0); 1119} 1120 1121/// getTemplateTypeParmType - Return the unique reference to the type 1122/// for the specified template type parameter declaration. 1123QualType ASTContext::getTemplateTypeParmType(TemplateTypeParmDecl *Decl) { 1124 if (!Decl->TypeForDecl) { 1125 void *Mem = Allocator.Allocate(sizeof(TemplateTypeParmType), 8); 1126 Decl->TypeForDecl = new (Mem) TemplateTypeParmType(Decl); 1127 Types.push_back(Decl->TypeForDecl); 1128 } 1129 return QualType(Decl->TypeForDecl, 0); 1130} 1131 1132/// getObjCInterfaceType - Return the unique reference to the type for the 1133/// specified ObjC interface decl. 1134QualType ASTContext::getObjCInterfaceType(ObjCInterfaceDecl *Decl) { 1135 if (Decl->TypeForDecl) return QualType(Decl->TypeForDecl, 0); 1136 1137 void *Mem = Allocator.Allocate(sizeof(ObjCInterfaceType), 8); 1138 Decl->TypeForDecl = new (Mem) ObjCInterfaceType(Type::ObjCInterface, Decl); 1139 Types.push_back(Decl->TypeForDecl); 1140 return QualType(Decl->TypeForDecl, 0); 1141} 1142 1143/// CmpProtocolNames - Comparison predicate for sorting protocols 1144/// alphabetically. 1145static bool CmpProtocolNames(const ObjCProtocolDecl *LHS, 1146 const ObjCProtocolDecl *RHS) { 1147 return LHS->getDeclName() < RHS->getDeclName(); 1148} 1149 1150static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols, 1151 unsigned &NumProtocols) { 1152 ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols; 1153 1154 // Sort protocols, keyed by name. 1155 std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames); 1156 1157 // Remove duplicates. 1158 ProtocolsEnd = std::unique(Protocols, ProtocolsEnd); 1159 NumProtocols = ProtocolsEnd-Protocols; 1160} 1161 1162 1163/// getObjCQualifiedInterfaceType - Return a ObjCQualifiedInterfaceType type for 1164/// the given interface decl and the conforming protocol list. 1165QualType ASTContext::getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 1166 ObjCProtocolDecl **Protocols, unsigned NumProtocols) { 1167 // Sort the protocol list alphabetically to canonicalize it. 1168 SortAndUniqueProtocols(Protocols, NumProtocols); 1169 1170 llvm::FoldingSetNodeID ID; 1171 ObjCQualifiedInterfaceType::Profile(ID, Decl, Protocols, NumProtocols); 1172 1173 void *InsertPos = 0; 1174 if (ObjCQualifiedInterfaceType *QT = 1175 ObjCQualifiedInterfaceTypes.FindNodeOrInsertPos(ID, InsertPos)) 1176 return QualType(QT, 0); 1177 1178 // No Match; 1179 void *Mem = Allocator.Allocate(sizeof(ObjCQualifiedInterfaceType), 8); 1180 ObjCQualifiedInterfaceType *QType = 1181 new (Mem) ObjCQualifiedInterfaceType(Decl, Protocols, NumProtocols); 1182 1183 Types.push_back(QType); 1184 ObjCQualifiedInterfaceTypes.InsertNode(QType, InsertPos); 1185 return QualType(QType, 0); 1186} 1187 1188/// getObjCQualifiedIdType - Return an ObjCQualifiedIdType for the 'id' decl 1189/// and the conforming protocol list. 1190QualType ASTContext::getObjCQualifiedIdType(ObjCProtocolDecl **Protocols, 1191 unsigned NumProtocols) { 1192 // Sort the protocol list alphabetically to canonicalize it. 1193 SortAndUniqueProtocols(Protocols, NumProtocols); 1194 1195 llvm::FoldingSetNodeID ID; 1196 ObjCQualifiedIdType::Profile(ID, Protocols, NumProtocols); 1197 1198 void *InsertPos = 0; 1199 if (ObjCQualifiedIdType *QT = 1200 ObjCQualifiedIdTypes.FindNodeOrInsertPos(ID, InsertPos)) 1201 return QualType(QT, 0); 1202 1203 // No Match; 1204 void *Mem = Allocator.Allocate(sizeof(ObjCQualifiedIdType), 8); 1205 ObjCQualifiedIdType *QType = 1206 new (Mem) ObjCQualifiedIdType(Protocols, NumProtocols); 1207 Types.push_back(QType); 1208 ObjCQualifiedIdTypes.InsertNode(QType, InsertPos); 1209 return QualType(QType, 0); 1210} 1211 1212/// getTypeOfExpr - Unlike many "get<Type>" functions, we can't unique 1213/// TypeOfExpr AST's (since expression's are never shared). For example, 1214/// multiple declarations that refer to "typeof(x)" all contain different 1215/// DeclRefExpr's. This doesn't effect the type checker, since it operates 1216/// on canonical type's (which are always unique). 1217QualType ASTContext::getTypeOfExpr(Expr *tofExpr) { 1218 QualType Canonical = getCanonicalType(tofExpr->getType()); 1219 TypeOfExpr *toe = new TypeOfExpr(tofExpr, Canonical); 1220 Types.push_back(toe); 1221 return QualType(toe, 0); 1222} 1223 1224/// getTypeOfType - Unlike many "get<Type>" functions, we don't unique 1225/// TypeOfType AST's. The only motivation to unique these nodes would be 1226/// memory savings. Since typeof(t) is fairly uncommon, space shouldn't be 1227/// an issue. This doesn't effect the type checker, since it operates 1228/// on canonical type's (which are always unique). 1229QualType ASTContext::getTypeOfType(QualType tofType) { 1230 QualType Canonical = getCanonicalType(tofType); 1231 void *Mem = Allocator.Allocate(sizeof(TypeOfType), 8); 1232 TypeOfType *tot = new (Mem) TypeOfType(tofType, Canonical); 1233 Types.push_back(tot); 1234 return QualType(tot, 0); 1235} 1236 1237/// getTagDeclType - Return the unique reference to the type for the 1238/// specified TagDecl (struct/union/class/enum) decl. 1239QualType ASTContext::getTagDeclType(TagDecl *Decl) { 1240 assert (Decl); 1241 return getTypeDeclType(Decl); 1242} 1243 1244/// getSizeType - Return the unique type for "size_t" (C99 7.17), the result 1245/// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and 1246/// needs to agree with the definition in <stddef.h>. 1247QualType ASTContext::getSizeType() const { 1248 return getFromTargetType(Target.getSizeType()); 1249} 1250 1251/// getWCharType - Return the unique type for "wchar_t" (C99 7.17), the 1252/// width of characters in wide strings, The value is target dependent and 1253/// needs to agree with the definition in <stddef.h>. 1254QualType ASTContext::getWCharType() const { 1255 if (LangOpts.CPlusPlus) 1256 return WCharTy; 1257 1258 // FIXME: In C, shouldn't WCharTy just be a typedef of the target's 1259 // wide-character type? 1260 return getFromTargetType(Target.getWCharType()); 1261} 1262 1263/// getSignedWCharType - Return the type of "signed wchar_t". 1264/// Used when in C++, as a GCC extension. 1265QualType ASTContext::getSignedWCharType() const { 1266 // FIXME: derive from "Target" ? 1267 return WCharTy; 1268} 1269 1270/// getUnsignedWCharType - Return the type of "unsigned wchar_t". 1271/// Used when in C++, as a GCC extension. 1272QualType ASTContext::getUnsignedWCharType() const { 1273 // FIXME: derive from "Target" ? 1274 return UnsignedIntTy; 1275} 1276 1277/// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 1278/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 1279QualType ASTContext::getPointerDiffType() const { 1280 return getFromTargetType(Target.getPtrDiffType(0)); 1281} 1282 1283//===----------------------------------------------------------------------===// 1284// Type Operators 1285//===----------------------------------------------------------------------===// 1286 1287/// getCanonicalType - Return the canonical (structural) type corresponding to 1288/// the specified potentially non-canonical type. The non-canonical version 1289/// of a type may have many "decorated" versions of types. Decorators can 1290/// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 1291/// to be free of any of these, allowing two canonical types to be compared 1292/// for exact equality with a simple pointer comparison. 1293QualType ASTContext::getCanonicalType(QualType T) { 1294 QualType CanType = T.getTypePtr()->getCanonicalTypeInternal(); 1295 1296 // If the result has type qualifiers, make sure to canonicalize them as well. 1297 unsigned TypeQuals = T.getCVRQualifiers() | CanType.getCVRQualifiers(); 1298 if (TypeQuals == 0) return CanType; 1299 1300 // If the type qualifiers are on an array type, get the canonical type of the 1301 // array with the qualifiers applied to the element type. 1302 ArrayType *AT = dyn_cast<ArrayType>(CanType); 1303 if (!AT) 1304 return CanType.getQualifiedType(TypeQuals); 1305 1306 // Get the canonical version of the element with the extra qualifiers on it. 1307 // This can recursively sink qualifiers through multiple levels of arrays. 1308 QualType NewEltTy=AT->getElementType().getWithAdditionalQualifiers(TypeQuals); 1309 NewEltTy = getCanonicalType(NewEltTy); 1310 1311 if (ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 1312 return getConstantArrayType(NewEltTy, CAT->getSize(),CAT->getSizeModifier(), 1313 CAT->getIndexTypeQualifier()); 1314 if (IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) 1315 return getIncompleteArrayType(NewEltTy, IAT->getSizeModifier(), 1316 IAT->getIndexTypeQualifier()); 1317 1318 if (DependentSizedArrayType *DSAT = dyn_cast<DependentSizedArrayType>(AT)) 1319 return getDependentSizedArrayType(NewEltTy, DSAT->getSizeExpr(), 1320 DSAT->getSizeModifier(), 1321 DSAT->getIndexTypeQualifier()); 1322 1323 VariableArrayType *VAT = cast<VariableArrayType>(AT); 1324 return getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1325 VAT->getSizeModifier(), 1326 VAT->getIndexTypeQualifier()); 1327} 1328 1329 1330const ArrayType *ASTContext::getAsArrayType(QualType T) { 1331 // Handle the non-qualified case efficiently. 1332 if (T.getCVRQualifiers() == 0) { 1333 // Handle the common positive case fast. 1334 if (const ArrayType *AT = dyn_cast<ArrayType>(T)) 1335 return AT; 1336 } 1337 1338 // Handle the common negative case fast, ignoring CVR qualifiers. 1339 QualType CType = T->getCanonicalTypeInternal(); 1340 1341 // Make sure to look through type qualifiers (like ASQuals) for the negative 1342 // test. 1343 if (!isa<ArrayType>(CType) && 1344 !isa<ArrayType>(CType.getUnqualifiedType())) 1345 return 0; 1346 1347 // Apply any CVR qualifiers from the array type to the element type. This 1348 // implements C99 6.7.3p8: "If the specification of an array type includes 1349 // any type qualifiers, the element type is so qualified, not the array type." 1350 1351 // If we get here, we either have type qualifiers on the type, or we have 1352 // sugar such as a typedef in the way. If we have type qualifiers on the type 1353 // we must propagate them down into the elemeng type. 1354 unsigned CVRQuals = T.getCVRQualifiers(); 1355 unsigned AddrSpace = 0; 1356 Type *Ty = T.getTypePtr(); 1357 1358 // Rip through ASQualType's and typedefs to get to a concrete type. 1359 while (1) { 1360 if (const ASQualType *ASQT = dyn_cast<ASQualType>(Ty)) { 1361 AddrSpace = ASQT->getAddressSpace(); 1362 Ty = ASQT->getBaseType(); 1363 } else { 1364 T = Ty->getDesugaredType(); 1365 if (T.getTypePtr() == Ty && T.getCVRQualifiers() == 0) 1366 break; 1367 CVRQuals |= T.getCVRQualifiers(); 1368 Ty = T.getTypePtr(); 1369 } 1370 } 1371 1372 // If we have a simple case, just return now. 1373 const ArrayType *ATy = dyn_cast<ArrayType>(Ty); 1374 if (ATy == 0 || (AddrSpace == 0 && CVRQuals == 0)) 1375 return ATy; 1376 1377 // Otherwise, we have an array and we have qualifiers on it. Push the 1378 // qualifiers into the array element type and return a new array type. 1379 // Get the canonical version of the element with the extra qualifiers on it. 1380 // This can recursively sink qualifiers through multiple levels of arrays. 1381 QualType NewEltTy = ATy->getElementType(); 1382 if (AddrSpace) 1383 NewEltTy = getASQualType(NewEltTy, AddrSpace); 1384 NewEltTy = NewEltTy.getWithAdditionalQualifiers(CVRQuals); 1385 1386 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(ATy)) 1387 return cast<ArrayType>(getConstantArrayType(NewEltTy, CAT->getSize(), 1388 CAT->getSizeModifier(), 1389 CAT->getIndexTypeQualifier())); 1390 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(ATy)) 1391 return cast<ArrayType>(getIncompleteArrayType(NewEltTy, 1392 IAT->getSizeModifier(), 1393 IAT->getIndexTypeQualifier())); 1394 1395 if (const DependentSizedArrayType *DSAT 1396 = dyn_cast<DependentSizedArrayType>(ATy)) 1397 return cast<ArrayType>( 1398 getDependentSizedArrayType(NewEltTy, 1399 DSAT->getSizeExpr(), 1400 DSAT->getSizeModifier(), 1401 DSAT->getIndexTypeQualifier())); 1402 1403 const VariableArrayType *VAT = cast<VariableArrayType>(ATy); 1404 return cast<ArrayType>(getVariableArrayType(NewEltTy, VAT->getSizeExpr(), 1405 VAT->getSizeModifier(), 1406 VAT->getIndexTypeQualifier())); 1407} 1408 1409 1410/// getArrayDecayedType - Return the properly qualified result of decaying the 1411/// specified array type to a pointer. This operation is non-trivial when 1412/// handling typedefs etc. The canonical type of "T" must be an array type, 1413/// this returns a pointer to a properly qualified element of the array. 1414/// 1415/// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 1416QualType ASTContext::getArrayDecayedType(QualType Ty) { 1417 // Get the element type with 'getAsArrayType' so that we don't lose any 1418 // typedefs in the element type of the array. This also handles propagation 1419 // of type qualifiers from the array type into the element type if present 1420 // (C99 6.7.3p8). 1421 const ArrayType *PrettyArrayType = getAsArrayType(Ty); 1422 assert(PrettyArrayType && "Not an array type!"); 1423 1424 QualType PtrTy = getPointerType(PrettyArrayType->getElementType()); 1425 1426 // int x[restrict 4] -> int *restrict 1427 return PtrTy.getQualifiedType(PrettyArrayType->getIndexTypeQualifier()); 1428} 1429 1430QualType ASTContext::getBaseElementType(const VariableArrayType *VAT) { 1431 QualType ElemTy = VAT->getElementType(); 1432 1433 if (const VariableArrayType *VAT = getAsVariableArrayType(ElemTy)) 1434 return getBaseElementType(VAT); 1435 1436 return ElemTy; 1437} 1438 1439/// getFloatingRank - Return a relative rank for floating point types. 1440/// This routine will assert if passed a built-in type that isn't a float. 1441static FloatingRank getFloatingRank(QualType T) { 1442 if (const ComplexType *CT = T->getAsComplexType()) 1443 return getFloatingRank(CT->getElementType()); 1444 1445 assert(T->getAsBuiltinType() && "getFloatingRank(): not a floating type"); 1446 switch (T->getAsBuiltinType()->getKind()) { 1447 default: assert(0 && "getFloatingRank(): not a floating type"); 1448 case BuiltinType::Float: return FloatRank; 1449 case BuiltinType::Double: return DoubleRank; 1450 case BuiltinType::LongDouble: return LongDoubleRank; 1451 } 1452} 1453 1454/// getFloatingTypeOfSizeWithinDomain - Returns a real floating 1455/// point or a complex type (based on typeDomain/typeSize). 1456/// 'typeDomain' is a real floating point or complex type. 1457/// 'typeSize' is a real floating point or complex type. 1458QualType ASTContext::getFloatingTypeOfSizeWithinDomain(QualType Size, 1459 QualType Domain) const { 1460 FloatingRank EltRank = getFloatingRank(Size); 1461 if (Domain->isComplexType()) { 1462 switch (EltRank) { 1463 default: assert(0 && "getFloatingRank(): illegal value for rank"); 1464 case FloatRank: return FloatComplexTy; 1465 case DoubleRank: return DoubleComplexTy; 1466 case LongDoubleRank: return LongDoubleComplexTy; 1467 } 1468 } 1469 1470 assert(Domain->isRealFloatingType() && "Unknown domain!"); 1471 switch (EltRank) { 1472 default: assert(0 && "getFloatingRank(): illegal value for rank"); 1473 case FloatRank: return FloatTy; 1474 case DoubleRank: return DoubleTy; 1475 case LongDoubleRank: return LongDoubleTy; 1476 } 1477} 1478 1479/// getFloatingTypeOrder - Compare the rank of the two specified floating 1480/// point types, ignoring the domain of the type (i.e. 'double' == 1481/// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 1482/// LHS < RHS, return -1. 1483int ASTContext::getFloatingTypeOrder(QualType LHS, QualType RHS) { 1484 FloatingRank LHSR = getFloatingRank(LHS); 1485 FloatingRank RHSR = getFloatingRank(RHS); 1486 1487 if (LHSR == RHSR) 1488 return 0; 1489 if (LHSR > RHSR) 1490 return 1; 1491 return -1; 1492} 1493 1494/// getIntegerRank - Return an integer conversion rank (C99 6.3.1.1p1). This 1495/// routine will assert if passed a built-in type that isn't an integer or enum, 1496/// or if it is not canonicalized. 1497static unsigned getIntegerRank(Type *T) { 1498 assert(T->isCanonical() && "T should be canonicalized"); 1499 if (isa<EnumType>(T)) 1500 return 4; 1501 1502 switch (cast<BuiltinType>(T)->getKind()) { 1503 default: assert(0 && "getIntegerRank(): not a built-in integer"); 1504 case BuiltinType::Bool: 1505 return 1; 1506 case BuiltinType::Char_S: 1507 case BuiltinType::Char_U: 1508 case BuiltinType::SChar: 1509 case BuiltinType::UChar: 1510 return 2; 1511 case BuiltinType::Short: 1512 case BuiltinType::UShort: 1513 return 3; 1514 case BuiltinType::Int: 1515 case BuiltinType::UInt: 1516 return 4; 1517 case BuiltinType::Long: 1518 case BuiltinType::ULong: 1519 return 5; 1520 case BuiltinType::LongLong: 1521 case BuiltinType::ULongLong: 1522 return 6; 1523 } 1524} 1525 1526/// getIntegerTypeOrder - Returns the highest ranked integer type: 1527/// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 1528/// LHS < RHS, return -1. 1529int ASTContext::getIntegerTypeOrder(QualType LHS, QualType RHS) { 1530 Type *LHSC = getCanonicalType(LHS).getTypePtr(); 1531 Type *RHSC = getCanonicalType(RHS).getTypePtr(); 1532 if (LHSC == RHSC) return 0; 1533 1534 bool LHSUnsigned = LHSC->isUnsignedIntegerType(); 1535 bool RHSUnsigned = RHSC->isUnsignedIntegerType(); 1536 1537 unsigned LHSRank = getIntegerRank(LHSC); 1538 unsigned RHSRank = getIntegerRank(RHSC); 1539 1540 if (LHSUnsigned == RHSUnsigned) { // Both signed or both unsigned. 1541 if (LHSRank == RHSRank) return 0; 1542 return LHSRank > RHSRank ? 1 : -1; 1543 } 1544 1545 // Otherwise, the LHS is signed and the RHS is unsigned or visa versa. 1546 if (LHSUnsigned) { 1547 // If the unsigned [LHS] type is larger, return it. 1548 if (LHSRank >= RHSRank) 1549 return 1; 1550 1551 // If the signed type can represent all values of the unsigned type, it 1552 // wins. Because we are dealing with 2's complement and types that are 1553 // powers of two larger than each other, this is always safe. 1554 return -1; 1555 } 1556 1557 // If the unsigned [RHS] type is larger, return it. 1558 if (RHSRank >= LHSRank) 1559 return -1; 1560 1561 // If the signed type can represent all values of the unsigned type, it 1562 // wins. Because we are dealing with 2's complement and types that are 1563 // powers of two larger than each other, this is always safe. 1564 return 1; 1565} 1566 1567// getCFConstantStringType - Return the type used for constant CFStrings. 1568QualType ASTContext::getCFConstantStringType() { 1569 if (!CFConstantStringTypeDecl) { 1570 CFConstantStringTypeDecl = 1571 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 1572 &Idents.get("NSConstantString")); 1573 QualType FieldTypes[4]; 1574 1575 // const int *isa; 1576 FieldTypes[0] = getPointerType(IntTy.getQualifiedType(QualType::Const)); 1577 // int flags; 1578 FieldTypes[1] = IntTy; 1579 // const char *str; 1580 FieldTypes[2] = getPointerType(CharTy.getQualifiedType(QualType::Const)); 1581 // long length; 1582 FieldTypes[3] = LongTy; 1583 1584 // Create fields 1585 for (unsigned i = 0; i < 4; ++i) { 1586 FieldDecl *Field = FieldDecl::Create(*this, CFConstantStringTypeDecl, 1587 SourceLocation(), 0, 1588 FieldTypes[i], /*BitWidth=*/0, 1589 /*Mutable=*/false); 1590 CFConstantStringTypeDecl->addDecl(Field); 1591 } 1592 1593 CFConstantStringTypeDecl->completeDefinition(*this); 1594 } 1595 1596 return getTagDeclType(CFConstantStringTypeDecl); 1597} 1598 1599QualType ASTContext::getObjCFastEnumerationStateType() 1600{ 1601 if (!ObjCFastEnumerationStateTypeDecl) { 1602 ObjCFastEnumerationStateTypeDecl = 1603 RecordDecl::Create(*this, TagDecl::TK_struct, TUDecl, SourceLocation(), 1604 &Idents.get("__objcFastEnumerationState")); 1605 1606 QualType FieldTypes[] = { 1607 UnsignedLongTy, 1608 getPointerType(ObjCIdType), 1609 getPointerType(UnsignedLongTy), 1610 getConstantArrayType(UnsignedLongTy, 1611 llvm::APInt(32, 5), ArrayType::Normal, 0) 1612 }; 1613 1614 for (size_t i = 0; i < 4; ++i) { 1615 FieldDecl *Field = FieldDecl::Create(*this, 1616 ObjCFastEnumerationStateTypeDecl, 1617 SourceLocation(), 0, 1618 FieldTypes[i], /*BitWidth=*/0, 1619 /*Mutable=*/false); 1620 ObjCFastEnumerationStateTypeDecl->addDecl(Field); 1621 } 1622 1623 ObjCFastEnumerationStateTypeDecl->completeDefinition(*this); 1624 } 1625 1626 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 1627} 1628 1629// This returns true if a type has been typedefed to BOOL: 1630// typedef <type> BOOL; 1631static bool isTypeTypedefedAsBOOL(QualType T) { 1632 if (const TypedefType *TT = dyn_cast<TypedefType>(T)) 1633 if (IdentifierInfo *II = TT->getDecl()->getIdentifier()) 1634 return II->isStr("BOOL"); 1635 1636 return false; 1637} 1638 1639/// getObjCEncodingTypeSize returns size of type for objective-c encoding 1640/// purpose. 1641int ASTContext::getObjCEncodingTypeSize(QualType type) { 1642 uint64_t sz = getTypeSize(type); 1643 1644 // Make all integer and enum types at least as large as an int 1645 if (sz > 0 && type->isIntegralType()) 1646 sz = std::max(sz, getTypeSize(IntTy)); 1647 // Treat arrays as pointers, since that's how they're passed in. 1648 else if (type->isArrayType()) 1649 sz = getTypeSize(VoidPtrTy); 1650 return sz / getTypeSize(CharTy); 1651} 1652 1653/// getObjCEncodingForMethodDecl - Return the encoded type for this method 1654/// declaration. 1655void ASTContext::getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, 1656 std::string& S) { 1657 // FIXME: This is not very efficient. 1658 // Encode type qualifer, 'in', 'inout', etc. for the return type. 1659 getObjCEncodingForTypeQualifier(Decl->getObjCDeclQualifier(), S); 1660 // Encode result type. 1661 getObjCEncodingForType(Decl->getResultType(), S); 1662 // Compute size of all parameters. 1663 // Start with computing size of a pointer in number of bytes. 1664 // FIXME: There might(should) be a better way of doing this computation! 1665 SourceLocation Loc; 1666 int PtrSize = getTypeSize(VoidPtrTy) / getTypeSize(CharTy); 1667 // The first two arguments (self and _cmd) are pointers; account for 1668 // their size. 1669 int ParmOffset = 2 * PtrSize; 1670 int NumOfParams = Decl->getNumParams(); 1671 for (int i = 0; i < NumOfParams; i++) { 1672 QualType PType = Decl->getParamDecl(i)->getType(); 1673 int sz = getObjCEncodingTypeSize (PType); 1674 assert (sz > 0 && "getObjCEncodingForMethodDecl - Incomplete param type"); 1675 ParmOffset += sz; 1676 } 1677 S += llvm::utostr(ParmOffset); 1678 S += "@0:"; 1679 S += llvm::utostr(PtrSize); 1680 1681 // Argument types. 1682 ParmOffset = 2 * PtrSize; 1683 for (int i = 0; i < NumOfParams; i++) { 1684 ParmVarDecl *PVDecl = Decl->getParamDecl(i); 1685 QualType PType = PVDecl->getOriginalType(); 1686 if (const ArrayType *AT = 1687 dyn_cast<ArrayType>(PType->getCanonicalTypeInternal())) 1688 // Use array's original type only if it has known number of 1689 // elements. 1690 if (!dyn_cast<ConstantArrayType>(AT)) 1691 PType = PVDecl->getType(); 1692 // Process argument qualifiers for user supplied arguments; such as, 1693 // 'in', 'inout', etc. 1694 getObjCEncodingForTypeQualifier(PVDecl->getObjCDeclQualifier(), S); 1695 getObjCEncodingForType(PType, S); 1696 S += llvm::utostr(ParmOffset); 1697 ParmOffset += getObjCEncodingTypeSize(PType); 1698 } 1699} 1700 1701/// getObjCEncodingForPropertyDecl - Return the encoded type for this 1702/// method declaration. If non-NULL, Container must be either an 1703/// ObjCCategoryImplDecl or ObjCImplementationDecl; it should only be 1704/// NULL when getting encodings for protocol properties. 1705void ASTContext::getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 1706 const Decl *Container, 1707 std::string& S) { 1708 // Collect information from the property implementation decl(s). 1709 bool Dynamic = false; 1710 ObjCPropertyImplDecl *SynthesizePID = 0; 1711 1712 // FIXME: Duplicated code due to poor abstraction. 1713 if (Container) { 1714 if (const ObjCCategoryImplDecl *CID = 1715 dyn_cast<ObjCCategoryImplDecl>(Container)) { 1716 for (ObjCCategoryImplDecl::propimpl_iterator 1717 i = CID->propimpl_begin(), e = CID->propimpl_end(); i != e; ++i) { 1718 ObjCPropertyImplDecl *PID = *i; 1719 if (PID->getPropertyDecl() == PD) { 1720 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 1721 Dynamic = true; 1722 } else { 1723 SynthesizePID = PID; 1724 } 1725 } 1726 } 1727 } else { 1728 const ObjCImplementationDecl *OID=cast<ObjCImplementationDecl>(Container); 1729 for (ObjCCategoryImplDecl::propimpl_iterator 1730 i = OID->propimpl_begin(), e = OID->propimpl_end(); i != e; ++i) { 1731 ObjCPropertyImplDecl *PID = *i; 1732 if (PID->getPropertyDecl() == PD) { 1733 if (PID->getPropertyImplementation()==ObjCPropertyImplDecl::Dynamic) { 1734 Dynamic = true; 1735 } else { 1736 SynthesizePID = PID; 1737 } 1738 } 1739 } 1740 } 1741 } 1742 1743 // FIXME: This is not very efficient. 1744 S = "T"; 1745 1746 // Encode result type. 1747 // FIXME: GCC uses a generating_property_type_encoding mode during 1748 // this part. Investigate. 1749 getObjCEncodingForType(PD->getType(), S); 1750 1751 if (PD->isReadOnly()) { 1752 S += ",R"; 1753 } else { 1754 switch (PD->getSetterKind()) { 1755 case ObjCPropertyDecl::Assign: break; 1756 case ObjCPropertyDecl::Copy: S += ",C"; break; 1757 case ObjCPropertyDecl::Retain: S += ",&"; break; 1758 } 1759 } 1760 1761 // It really isn't clear at all what this means, since properties 1762 // are "dynamic by default". 1763 if (Dynamic) 1764 S += ",D"; 1765 1766 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_getter) { 1767 S += ",G"; 1768 S += PD->getGetterName().getAsString(); 1769 } 1770 1771 if (PD->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter) { 1772 S += ",S"; 1773 S += PD->getSetterName().getAsString(); 1774 } 1775 1776 if (SynthesizePID) { 1777 const ObjCIvarDecl *OID = SynthesizePID->getPropertyIvarDecl(); 1778 S += ",V"; 1779 S += OID->getNameAsString(); 1780 } 1781 1782 // FIXME: OBJCGC: weak & strong 1783} 1784 1785/// getLegacyIntegralTypeEncoding - 1786/// Another legacy compatibility encoding: 32-bit longs are encoded as 1787/// 'l' or 'L', but not always. For typedefs, we need to use 1788/// 'i' or 'I' instead if encoding a struct field, or a pointer! 1789/// 1790void ASTContext::getLegacyIntegralTypeEncoding (QualType &PointeeTy) const { 1791 if (dyn_cast<TypedefType>(PointeeTy.getTypePtr())) { 1792 if (const BuiltinType *BT = PointeeTy->getAsBuiltinType()) { 1793 if (BT->getKind() == BuiltinType::ULong) 1794 PointeeTy = UnsignedIntTy; 1795 else if (BT->getKind() == BuiltinType::Long) 1796 PointeeTy = IntTy; 1797 } 1798 } 1799} 1800 1801void ASTContext::getObjCEncodingForType(QualType T, std::string& S, 1802 FieldDecl *Field) const { 1803 // We follow the behavior of gcc, expanding structures which are 1804 // directly pointed to, and expanding embedded structures. Note that 1805 // these rules are sufficient to prevent recursive encoding of the 1806 // same type. 1807 getObjCEncodingForTypeImpl(T, S, true, true, Field, 1808 true /* outermost type */); 1809} 1810 1811static void EncodeBitField(const ASTContext *Context, std::string& S, 1812 FieldDecl *FD) { 1813 const Expr *E = FD->getBitWidth(); 1814 assert(E && "bitfield width not there - getObjCEncodingForTypeImpl"); 1815 ASTContext *Ctx = const_cast<ASTContext*>(Context); 1816 unsigned N = E->getIntegerConstantExprValue(*Ctx).getZExtValue(); 1817 S += 'b'; 1818 S += llvm::utostr(N); 1819} 1820 1821void ASTContext::getObjCEncodingForTypeImpl(QualType T, std::string& S, 1822 bool ExpandPointedToStructures, 1823 bool ExpandStructures, 1824 FieldDecl *FD, 1825 bool OutermostType) const { 1826 if (const BuiltinType *BT = T->getAsBuiltinType()) { 1827 if (FD && FD->isBitField()) { 1828 EncodeBitField(this, S, FD); 1829 } 1830 else { 1831 char encoding; 1832 switch (BT->getKind()) { 1833 default: assert(0 && "Unhandled builtin type kind"); 1834 case BuiltinType::Void: encoding = 'v'; break; 1835 case BuiltinType::Bool: encoding = 'B'; break; 1836 case BuiltinType::Char_U: 1837 case BuiltinType::UChar: encoding = 'C'; break; 1838 case BuiltinType::UShort: encoding = 'S'; break; 1839 case BuiltinType::UInt: encoding = 'I'; break; 1840 case BuiltinType::ULong: encoding = 'L'; break; 1841 case BuiltinType::ULongLong: encoding = 'Q'; break; 1842 case BuiltinType::Char_S: 1843 case BuiltinType::SChar: encoding = 'c'; break; 1844 case BuiltinType::Short: encoding = 's'; break; 1845 case BuiltinType::Int: encoding = 'i'; break; 1846 case BuiltinType::Long: encoding = 'l'; break; 1847 case BuiltinType::LongLong: encoding = 'q'; break; 1848 case BuiltinType::Float: encoding = 'f'; break; 1849 case BuiltinType::Double: encoding = 'd'; break; 1850 case BuiltinType::LongDouble: encoding = 'd'; break; 1851 } 1852 1853 S += encoding; 1854 } 1855 } 1856 else if (T->isObjCQualifiedIdType()) { 1857 // Treat id<P...> same as 'id' for encoding purposes. 1858 return getObjCEncodingForTypeImpl(getObjCIdType(), S, 1859 ExpandPointedToStructures, 1860 ExpandStructures, FD); 1861 } 1862 else if (const PointerType *PT = T->getAsPointerType()) { 1863 QualType PointeeTy = PT->getPointeeType(); 1864 bool isReadOnly = false; 1865 // For historical/compatibility reasons, the read-only qualifier of the 1866 // pointee gets emitted _before_ the '^'. The read-only qualifier of 1867 // the pointer itself gets ignored, _unless_ we are looking at a typedef! 1868 // Also, do not emit the 'r' for anything but the outermost type! 1869 if (dyn_cast<TypedefType>(T.getTypePtr())) { 1870 if (OutermostType && T.isConstQualified()) { 1871 isReadOnly = true; 1872 S += 'r'; 1873 } 1874 } 1875 else if (OutermostType) { 1876 QualType P = PointeeTy; 1877 while (P->getAsPointerType()) 1878 P = P->getAsPointerType()->getPointeeType(); 1879 if (P.isConstQualified()) { 1880 isReadOnly = true; 1881 S += 'r'; 1882 } 1883 } 1884 if (isReadOnly) { 1885 // Another legacy compatibility encoding. Some ObjC qualifier and type 1886 // combinations need to be rearranged. 1887 // Rewrite "in const" from "nr" to "rn" 1888 const char * s = S.c_str(); 1889 int len = S.length(); 1890 if (len >= 2 && s[len-2] == 'n' && s[len-1] == 'r') { 1891 std::string replace = "rn"; 1892 S.replace(S.end()-2, S.end(), replace); 1893 } 1894 } 1895 if (isObjCIdType(PointeeTy)) { 1896 S += '@'; 1897 return; 1898 } 1899 else if (PointeeTy->isObjCInterfaceType()) { 1900 if (dyn_cast<TypedefType>(PointeeTy.getTypePtr())) { 1901 // Another historical/compatibility reason. 1902 // We encode the underlying type which comes out as 1903 // {...}; 1904 S += '^'; 1905 getObjCEncodingForTypeImpl(PointeeTy, S, 1906 false, ExpandPointedToStructures, 1907 NULL); 1908 return; 1909 } 1910 S += '@'; 1911 if (FD) { 1912 ObjCInterfaceDecl *OI = PointeeTy->getAsObjCInterfaceType()->getDecl(); 1913 S += '"'; 1914 S += OI->getNameAsCString(); 1915 S += '"'; 1916 } 1917 return; 1918 } else if (isObjCClassType(PointeeTy)) { 1919 S += '#'; 1920 return; 1921 } else if (isObjCSelType(PointeeTy)) { 1922 S += ':'; 1923 return; 1924 } 1925 1926 if (PointeeTy->isCharType()) { 1927 // char pointer types should be encoded as '*' unless it is a 1928 // type that has been typedef'd to 'BOOL'. 1929 if (!isTypeTypedefedAsBOOL(PointeeTy)) { 1930 S += '*'; 1931 return; 1932 } 1933 } 1934 1935 S += '^'; 1936 getLegacyIntegralTypeEncoding(PointeeTy); 1937 1938 getObjCEncodingForTypeImpl(PointeeTy, S, 1939 false, ExpandPointedToStructures, 1940 NULL); 1941 } else if (const ArrayType *AT = 1942 // Ignore type qualifiers etc. 1943 dyn_cast<ArrayType>(T->getCanonicalTypeInternal())) { 1944 S += '['; 1945 1946 if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) 1947 S += llvm::utostr(CAT->getSize().getZExtValue()); 1948 else 1949 assert(0 && "Unhandled array type!"); 1950 1951 getObjCEncodingForTypeImpl(AT->getElementType(), S, 1952 false, ExpandStructures, FD); 1953 S += ']'; 1954 } else if (T->getAsFunctionType()) { 1955 S += '?'; 1956 } else if (const RecordType *RTy = T->getAsRecordType()) { 1957 RecordDecl *RDecl = RTy->getDecl(); 1958 S += RDecl->isUnion() ? '(' : '{'; 1959 // Anonymous structures print as '?' 1960 if (const IdentifierInfo *II = RDecl->getIdentifier()) { 1961 S += II->getName(); 1962 } else { 1963 S += '?'; 1964 } 1965 if (ExpandStructures) { 1966 S += '='; 1967 for (RecordDecl::field_iterator Field = RDecl->field_begin(), 1968 FieldEnd = RDecl->field_end(); 1969 Field != FieldEnd; ++Field) { 1970 if (FD) { 1971 S += '"'; 1972 S += Field->getNameAsString(); 1973 S += '"'; 1974 } 1975 1976 // Special case bit-fields. 1977 if (Field->isBitField()) { 1978 getObjCEncodingForTypeImpl(Field->getType(), S, false, true, 1979 (*Field)); 1980 } else { 1981 QualType qt = Field->getType(); 1982 getLegacyIntegralTypeEncoding(qt); 1983 getObjCEncodingForTypeImpl(qt, S, false, true, 1984 FD); 1985 } 1986 } 1987 } 1988 S += RDecl->isUnion() ? ')' : '}'; 1989 } else if (T->isEnumeralType()) { 1990 if (FD && FD->isBitField()) 1991 EncodeBitField(this, S, FD); 1992 else 1993 S += 'i'; 1994 } else if (T->isBlockPointerType()) { 1995 S += '^'; // This type string is the same as general pointers. 1996 } else if (T->isObjCInterfaceType()) { 1997 // @encode(class_name) 1998 ObjCInterfaceDecl *OI = T->getAsObjCInterfaceType()->getDecl(); 1999 S += '{'; 2000 const IdentifierInfo *II = OI->getIdentifier(); 2001 S += II->getName(); 2002 S += '='; 2003 std::vector<FieldDecl*> RecFields; 2004 CollectObjCIvars(OI, RecFields); 2005 for (unsigned int i = 0; i != RecFields.size(); i++) { 2006 if (RecFields[i]->isBitField()) 2007 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2008 RecFields[i]); 2009 else 2010 getObjCEncodingForTypeImpl(RecFields[i]->getType(), S, false, true, 2011 FD); 2012 } 2013 S += '}'; 2014 } 2015 else 2016 assert(0 && "@encode for type not implemented!"); 2017} 2018 2019void ASTContext::getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 2020 std::string& S) const { 2021 if (QT & Decl::OBJC_TQ_In) 2022 S += 'n'; 2023 if (QT & Decl::OBJC_TQ_Inout) 2024 S += 'N'; 2025 if (QT & Decl::OBJC_TQ_Out) 2026 S += 'o'; 2027 if (QT & Decl::OBJC_TQ_Bycopy) 2028 S += 'O'; 2029 if (QT & Decl::OBJC_TQ_Byref) 2030 S += 'R'; 2031 if (QT & Decl::OBJC_TQ_Oneway) 2032 S += 'V'; 2033} 2034 2035void ASTContext::setBuiltinVaListType(QualType T) 2036{ 2037 assert(BuiltinVaListType.isNull() && "__builtin_va_list type already set!"); 2038 2039 BuiltinVaListType = T; 2040} 2041 2042void ASTContext::setObjCIdType(TypedefDecl *TD) 2043{ 2044 ObjCIdType = getTypedefType(TD); 2045 2046 // typedef struct objc_object *id; 2047 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2048 // User error - caller will issue diagnostics. 2049 if (!ptr) 2050 return; 2051 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2052 // User error - caller will issue diagnostics. 2053 if (!rec) 2054 return; 2055 IdStructType = rec; 2056} 2057 2058void ASTContext::setObjCSelType(TypedefDecl *TD) 2059{ 2060 ObjCSelType = getTypedefType(TD); 2061 2062 // typedef struct objc_selector *SEL; 2063 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2064 if (!ptr) 2065 return; 2066 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2067 if (!rec) 2068 return; 2069 SelStructType = rec; 2070} 2071 2072void ASTContext::setObjCProtoType(QualType QT) 2073{ 2074 ObjCProtoType = QT; 2075} 2076 2077void ASTContext::setObjCClassType(TypedefDecl *TD) 2078{ 2079 ObjCClassType = getTypedefType(TD); 2080 2081 // typedef struct objc_class *Class; 2082 const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType(); 2083 assert(ptr && "'Class' incorrectly typed"); 2084 const RecordType *rec = ptr->getPointeeType()->getAsStructureType(); 2085 assert(rec && "'Class' incorrectly typed"); 2086 ClassStructType = rec; 2087} 2088 2089void ASTContext::setObjCConstantStringInterface(ObjCInterfaceDecl *Decl) { 2090 assert(ObjCConstantStringType.isNull() && 2091 "'NSConstantString' type already set!"); 2092 2093 ObjCConstantStringType = getObjCInterfaceType(Decl); 2094} 2095 2096/// getFromTargetType - Given one of the integer types provided by 2097/// TargetInfo, produce the corresponding type. The unsigned @p Type 2098/// is actually a value of type @c TargetInfo::IntType. 2099QualType ASTContext::getFromTargetType(unsigned Type) const { 2100 switch (Type) { 2101 case TargetInfo::NoInt: return QualType(); 2102 case TargetInfo::SignedShort: return ShortTy; 2103 case TargetInfo::UnsignedShort: return UnsignedShortTy; 2104 case TargetInfo::SignedInt: return IntTy; 2105 case TargetInfo::UnsignedInt: return UnsignedIntTy; 2106 case TargetInfo::SignedLong: return LongTy; 2107 case TargetInfo::UnsignedLong: return UnsignedLongTy; 2108 case TargetInfo::SignedLongLong: return LongLongTy; 2109 case TargetInfo::UnsignedLongLong: return UnsignedLongLongTy; 2110 } 2111 2112 assert(false && "Unhandled TargetInfo::IntType value"); 2113 return QualType(); 2114} 2115 2116//===----------------------------------------------------------------------===// 2117// Type Predicates. 2118//===----------------------------------------------------------------------===// 2119 2120/// isObjCNSObjectType - Return true if this is an NSObject object using 2121/// NSObject attribute on a c-style pointer type. 2122/// FIXME - Make it work directly on types. 2123/// 2124bool ASTContext::isObjCNSObjectType(QualType Ty) const { 2125 if (TypedefType *TDT = dyn_cast<TypedefType>(Ty)) { 2126 if (TypedefDecl *TD = TDT->getDecl()) 2127 if (TD->getAttr<ObjCNSObjectAttr>()) 2128 return true; 2129 } 2130 return false; 2131} 2132 2133/// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 2134/// to an object type. This includes "id" and "Class" (two 'special' pointers 2135/// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 2136/// ID type). 2137bool ASTContext::isObjCObjectPointerType(QualType Ty) const { 2138 if (Ty->isObjCQualifiedIdType()) 2139 return true; 2140 2141 // Blocks are objects. 2142 if (Ty->isBlockPointerType()) 2143 return true; 2144 2145 // All other object types are pointers. 2146 if (!Ty->isPointerType()) 2147 return false; 2148 2149 // Check to see if this is 'id' or 'Class', both of which are typedefs for 2150 // pointer types. This looks for the typedef specifically, not for the 2151 // underlying type. 2152 if (Ty == getObjCIdType() || Ty == getObjCClassType()) 2153 return true; 2154 2155 // If this a pointer to an interface (e.g. NSString*), it is ok. 2156 if (Ty->getAsPointerType()->getPointeeType()->isObjCInterfaceType()) 2157 return true; 2158 2159 // If is has NSObject attribute, OK as well. 2160 return isObjCNSObjectType(Ty); 2161} 2162 2163//===----------------------------------------------------------------------===// 2164// Type Compatibility Testing 2165//===----------------------------------------------------------------------===// 2166 2167/// typesAreBlockCompatible - This routine is called when comparing two 2168/// block types. Types must be strictly compatible here. For example, 2169/// C unfortunately doesn't produce an error for the following: 2170/// 2171/// int (*emptyArgFunc)(); 2172/// int (*intArgList)(int) = emptyArgFunc; 2173/// 2174/// For blocks, we will produce an error for the following (similar to C++): 2175/// 2176/// int (^emptyArgBlock)(); 2177/// int (^intArgBlock)(int) = emptyArgBlock; 2178/// 2179/// FIXME: When the dust settles on this integration, fold this into mergeTypes. 2180/// 2181bool ASTContext::typesAreBlockCompatible(QualType lhs, QualType rhs) { 2182 const FunctionType *lbase = lhs->getAsFunctionType(); 2183 const FunctionType *rbase = rhs->getAsFunctionType(); 2184 const FunctionTypeProto *lproto = dyn_cast<FunctionTypeProto>(lbase); 2185 const FunctionTypeProto *rproto = dyn_cast<FunctionTypeProto>(rbase); 2186 if (lproto && rproto) 2187 return !mergeTypes(lhs, rhs).isNull(); 2188 return false; 2189} 2190 2191/// areCompatVectorTypes - Return true if the two specified vector types are 2192/// compatible. 2193static bool areCompatVectorTypes(const VectorType *LHS, 2194 const VectorType *RHS) { 2195 assert(LHS->isCanonical() && RHS->isCanonical()); 2196 return LHS->getElementType() == RHS->getElementType() && 2197 LHS->getNumElements() == RHS->getNumElements(); 2198} 2199 2200/// canAssignObjCInterfaces - Return true if the two interface types are 2201/// compatible for assignment from RHS to LHS. This handles validation of any 2202/// protocol qualifiers on the LHS or RHS. 2203/// 2204bool ASTContext::canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 2205 const ObjCInterfaceType *RHS) { 2206 // Verify that the base decls are compatible: the RHS must be a subclass of 2207 // the LHS. 2208 if (!LHS->getDecl()->isSuperClassOf(RHS->getDecl())) 2209 return false; 2210 2211 // RHS must have a superset of the protocols in the LHS. If the LHS is not 2212 // protocol qualified at all, then we are good. 2213 if (!isa<ObjCQualifiedInterfaceType>(LHS)) 2214 return true; 2215 2216 // Okay, we know the LHS has protocol qualifiers. If the RHS doesn't, then it 2217 // isn't a superset. 2218 if (!isa<ObjCQualifiedInterfaceType>(RHS)) 2219 return true; // FIXME: should return false! 2220 2221 // Finally, we must have two protocol-qualified interfaces. 2222 const ObjCQualifiedInterfaceType *LHSP =cast<ObjCQualifiedInterfaceType>(LHS); 2223 const ObjCQualifiedInterfaceType *RHSP =cast<ObjCQualifiedInterfaceType>(RHS); 2224 ObjCQualifiedInterfaceType::qual_iterator LHSPI = LHSP->qual_begin(); 2225 ObjCQualifiedInterfaceType::qual_iterator LHSPE = LHSP->qual_end(); 2226 ObjCQualifiedInterfaceType::qual_iterator RHSPI = RHSP->qual_begin(); 2227 ObjCQualifiedInterfaceType::qual_iterator RHSPE = RHSP->qual_end(); 2228 2229 // All protocols in LHS must have a presence in RHS. Since the protocol lists 2230 // are both sorted alphabetically and have no duplicates, we can scan RHS and 2231 // LHS in a single parallel scan until we run out of elements in LHS. 2232 assert(LHSPI != LHSPE && "Empty LHS protocol list?"); 2233 ObjCProtocolDecl *LHSProto = *LHSPI; 2234 2235 while (RHSPI != RHSPE) { 2236 ObjCProtocolDecl *RHSProto = *RHSPI++; 2237 // If the RHS has a protocol that the LHS doesn't, ignore it. 2238 if (RHSProto != LHSProto) 2239 continue; 2240 2241 // Otherwise, the RHS does have this element. 2242 ++LHSPI; 2243 if (LHSPI == LHSPE) 2244 return true; // All protocols in LHS exist in RHS. 2245 2246 LHSProto = *LHSPI; 2247 } 2248 2249 // If we got here, we didn't find one of the LHS's protocols in the RHS list. 2250 return false; 2251} 2252 2253/// typesAreCompatible - C99 6.7.3p9: For two qualified types to be compatible, 2254/// both shall have the identically qualified version of a compatible type. 2255/// C99 6.2.7p1: Two types have compatible types if their types are the 2256/// same. See 6.7.[2,3,5] for additional rules. 2257bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) { 2258 return !mergeTypes(LHS, RHS).isNull(); 2259} 2260 2261QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs) { 2262 const FunctionType *lbase = lhs->getAsFunctionType(); 2263 const FunctionType *rbase = rhs->getAsFunctionType(); 2264 const FunctionTypeProto *lproto = dyn_cast<FunctionTypeProto>(lbase); 2265 const FunctionTypeProto *rproto = dyn_cast<FunctionTypeProto>(rbase); 2266 bool allLTypes = true; 2267 bool allRTypes = true; 2268 2269 // Check return type 2270 QualType retType = mergeTypes(lbase->getResultType(), rbase->getResultType()); 2271 if (retType.isNull()) return QualType(); 2272 if (getCanonicalType(retType) != getCanonicalType(lbase->getResultType())) 2273 allLTypes = false; 2274 if (getCanonicalType(retType) != getCanonicalType(rbase->getResultType())) 2275 allRTypes = false; 2276 2277 if (lproto && rproto) { // two C99 style function prototypes 2278 unsigned lproto_nargs = lproto->getNumArgs(); 2279 unsigned rproto_nargs = rproto->getNumArgs(); 2280 2281 // Compatible functions must have the same number of arguments 2282 if (lproto_nargs != rproto_nargs) 2283 return QualType(); 2284 2285 // Variadic and non-variadic functions aren't compatible 2286 if (lproto->isVariadic() != rproto->isVariadic()) 2287 return QualType(); 2288 2289 if (lproto->getTypeQuals() != rproto->getTypeQuals()) 2290 return QualType(); 2291 2292 // Check argument compatibility 2293 llvm::SmallVector<QualType, 10> types; 2294 for (unsigned i = 0; i < lproto_nargs; i++) { 2295 QualType largtype = lproto->getArgType(i).getUnqualifiedType(); 2296 QualType rargtype = rproto->getArgType(i).getUnqualifiedType(); 2297 QualType argtype = mergeTypes(largtype, rargtype); 2298 if (argtype.isNull()) return QualType(); 2299 types.push_back(argtype); 2300 if (getCanonicalType(argtype) != getCanonicalType(largtype)) 2301 allLTypes = false; 2302 if (getCanonicalType(argtype) != getCanonicalType(rargtype)) 2303 allRTypes = false; 2304 } 2305 if (allLTypes) return lhs; 2306 if (allRTypes) return rhs; 2307 return getFunctionType(retType, types.begin(), types.size(), 2308 lproto->isVariadic(), lproto->getTypeQuals()); 2309 } 2310 2311 if (lproto) allRTypes = false; 2312 if (rproto) allLTypes = false; 2313 2314 const FunctionTypeProto *proto = lproto ? lproto : rproto; 2315 if (proto) { 2316 if (proto->isVariadic()) return QualType(); 2317 // Check that the types are compatible with the types that 2318 // would result from default argument promotions (C99 6.7.5.3p15). 2319 // The only types actually affected are promotable integer 2320 // types and floats, which would be passed as a different 2321 // type depending on whether the prototype is visible. 2322 unsigned proto_nargs = proto->getNumArgs(); 2323 for (unsigned i = 0; i < proto_nargs; ++i) { 2324 QualType argTy = proto->getArgType(i); 2325 if (argTy->isPromotableIntegerType() || 2326 getCanonicalType(argTy).getUnqualifiedType() == FloatTy) 2327 return QualType(); 2328 } 2329 2330 if (allLTypes) return lhs; 2331 if (allRTypes) return rhs; 2332 return getFunctionType(retType, proto->arg_type_begin(), 2333 proto->getNumArgs(), lproto->isVariadic(), 2334 lproto->getTypeQuals()); 2335 } 2336 2337 if (allLTypes) return lhs; 2338 if (allRTypes) return rhs; 2339 return getFunctionTypeNoProto(retType); 2340} 2341 2342QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) { 2343 // C++ [expr]: If an expression initially has the type "reference to T", the 2344 // type is adjusted to "T" prior to any further analysis, the expression 2345 // designates the object or function denoted by the reference, and the 2346 // expression is an lvalue. 2347 // FIXME: C++ shouldn't be going through here! The rules are different 2348 // enough that they should be handled separately. 2349 if (const ReferenceType *RT = LHS->getAsReferenceType()) 2350 LHS = RT->getPointeeType(); 2351 if (const ReferenceType *RT = RHS->getAsReferenceType()) 2352 RHS = RT->getPointeeType(); 2353 2354 QualType LHSCan = getCanonicalType(LHS), 2355 RHSCan = getCanonicalType(RHS); 2356 2357 // If two types are identical, they are compatible. 2358 if (LHSCan == RHSCan) 2359 return LHS; 2360 2361 // If the qualifiers are different, the types aren't compatible 2362 if (LHSCan.getCVRQualifiers() != RHSCan.getCVRQualifiers() || 2363 LHSCan.getAddressSpace() != RHSCan.getAddressSpace()) 2364 return QualType(); 2365 2366 Type::TypeClass LHSClass = LHSCan->getTypeClass(); 2367 Type::TypeClass RHSClass = RHSCan->getTypeClass(); 2368 2369 // We want to consider the two function types to be the same for these 2370 // comparisons, just force one to the other. 2371 if (LHSClass == Type::FunctionProto) LHSClass = Type::FunctionNoProto; 2372 if (RHSClass == Type::FunctionProto) RHSClass = Type::FunctionNoProto; 2373 2374 // Same as above for arrays 2375 if (LHSClass == Type::VariableArray || LHSClass == Type::IncompleteArray) 2376 LHSClass = Type::ConstantArray; 2377 if (RHSClass == Type::VariableArray || RHSClass == Type::IncompleteArray) 2378 RHSClass = Type::ConstantArray; 2379 2380 // Canonicalize ExtVector -> Vector. 2381 if (LHSClass == Type::ExtVector) LHSClass = Type::Vector; 2382 if (RHSClass == Type::ExtVector) RHSClass = Type::Vector; 2383 2384 // Consider qualified interfaces and interfaces the same. 2385 if (LHSClass == Type::ObjCQualifiedInterface) LHSClass = Type::ObjCInterface; 2386 if (RHSClass == Type::ObjCQualifiedInterface) RHSClass = Type::ObjCInterface; 2387 2388 // If the canonical type classes don't match. 2389 if (LHSClass != RHSClass) { 2390 // ID is compatible with all qualified id types. 2391 if (LHS->isObjCQualifiedIdType()) { 2392 if (const PointerType *PT = RHS->getAsPointerType()) { 2393 QualType pType = PT->getPointeeType(); 2394 if (isObjCIdType(pType)) 2395 return LHS; 2396 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 2397 // Unfortunately, this API is part of Sema (which we don't have access 2398 // to. Need to refactor. The following check is insufficient, since we 2399 // need to make sure the class implements the protocol. 2400 if (pType->isObjCInterfaceType()) 2401 return LHS; 2402 } 2403 } 2404 if (RHS->isObjCQualifiedIdType()) { 2405 if (const PointerType *PT = LHS->getAsPointerType()) { 2406 QualType pType = PT->getPointeeType(); 2407 if (isObjCIdType(pType)) 2408 return RHS; 2409 // FIXME: need to use ObjCQualifiedIdTypesAreCompatible(LHS, RHS, true). 2410 // Unfortunately, this API is part of Sema (which we don't have access 2411 // to. Need to refactor. The following check is insufficient, since we 2412 // need to make sure the class implements the protocol. 2413 if (pType->isObjCInterfaceType()) 2414 return RHS; 2415 } 2416 } 2417 // C99 6.7.2.2p4: Each enumerated type shall be compatible with char, 2418 // a signed integer type, or an unsigned integer type. 2419 if (const EnumType* ETy = LHS->getAsEnumType()) { 2420 if (ETy->getDecl()->getIntegerType() == RHSCan.getUnqualifiedType()) 2421 return RHS; 2422 } 2423 if (const EnumType* ETy = RHS->getAsEnumType()) { 2424 if (ETy->getDecl()->getIntegerType() == LHSCan.getUnqualifiedType()) 2425 return LHS; 2426 } 2427 2428 return QualType(); 2429 } 2430 2431 // The canonical type classes match. 2432 switch (LHSClass) { 2433 case Type::Pointer: 2434 { 2435 // Merge two pointer types, while trying to preserve typedef info 2436 QualType LHSPointee = LHS->getAsPointerType()->getPointeeType(); 2437 QualType RHSPointee = RHS->getAsPointerType()->getPointeeType(); 2438 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 2439 if (ResultType.isNull()) return QualType(); 2440 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 2441 return LHS; 2442 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 2443 return RHS; 2444 return getPointerType(ResultType); 2445 } 2446 case Type::BlockPointer: 2447 { 2448 // Merge two block pointer types, while trying to preserve typedef info 2449 QualType LHSPointee = LHS->getAsBlockPointerType()->getPointeeType(); 2450 QualType RHSPointee = RHS->getAsBlockPointerType()->getPointeeType(); 2451 QualType ResultType = mergeTypes(LHSPointee, RHSPointee); 2452 if (ResultType.isNull()) return QualType(); 2453 if (getCanonicalType(LHSPointee) == getCanonicalType(ResultType)) 2454 return LHS; 2455 if (getCanonicalType(RHSPointee) == getCanonicalType(ResultType)) 2456 return RHS; 2457 return getBlockPointerType(ResultType); 2458 } 2459 case Type::ConstantArray: 2460 { 2461 const ConstantArrayType* LCAT = getAsConstantArrayType(LHS); 2462 const ConstantArrayType* RCAT = getAsConstantArrayType(RHS); 2463 if (LCAT && RCAT && RCAT->getSize() != LCAT->getSize()) 2464 return QualType(); 2465 2466 QualType LHSElem = getAsArrayType(LHS)->getElementType(); 2467 QualType RHSElem = getAsArrayType(RHS)->getElementType(); 2468 QualType ResultType = mergeTypes(LHSElem, RHSElem); 2469 if (ResultType.isNull()) return QualType(); 2470 if (LCAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 2471 return LHS; 2472 if (RCAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 2473 return RHS; 2474 if (LCAT) return getConstantArrayType(ResultType, LCAT->getSize(), 2475 ArrayType::ArraySizeModifier(), 0); 2476 if (RCAT) return getConstantArrayType(ResultType, RCAT->getSize(), 2477 ArrayType::ArraySizeModifier(), 0); 2478 const VariableArrayType* LVAT = getAsVariableArrayType(LHS); 2479 const VariableArrayType* RVAT = getAsVariableArrayType(RHS); 2480 if (LVAT && getCanonicalType(LHSElem) == getCanonicalType(ResultType)) 2481 return LHS; 2482 if (RVAT && getCanonicalType(RHSElem) == getCanonicalType(ResultType)) 2483 return RHS; 2484 if (LVAT) { 2485 // FIXME: This isn't correct! But tricky to implement because 2486 // the array's size has to be the size of LHS, but the type 2487 // has to be different. 2488 return LHS; 2489 } 2490 if (RVAT) { 2491 // FIXME: This isn't correct! But tricky to implement because 2492 // the array's size has to be the size of RHS, but the type 2493 // has to be different. 2494 return RHS; 2495 } 2496 if (getCanonicalType(LHSElem) == getCanonicalType(ResultType)) return LHS; 2497 if (getCanonicalType(RHSElem) == getCanonicalType(ResultType)) return RHS; 2498 return getIncompleteArrayType(ResultType, ArrayType::ArraySizeModifier(),0); 2499 } 2500 case Type::FunctionNoProto: 2501 return mergeFunctionTypes(LHS, RHS); 2502 case Type::Tagged: 2503 // FIXME: Why are these compatible? 2504 if (isObjCIdType(LHS) && isObjCClassType(RHS)) return LHS; 2505 if (isObjCClassType(LHS) && isObjCIdType(RHS)) return LHS; 2506 return QualType(); 2507 case Type::Builtin: 2508 // Only exactly equal builtin types are compatible, which is tested above. 2509 return QualType(); 2510 case Type::Vector: 2511 if (areCompatVectorTypes(LHS->getAsVectorType(), RHS->getAsVectorType())) 2512 return LHS; 2513 return QualType(); 2514 case Type::ObjCInterface: 2515 // Distinct ObjC interfaces are not compatible; see canAssignObjCInterfaces 2516 // for checking assignment/comparison safety 2517 return QualType(); 2518 case Type::ObjCQualifiedId: 2519 // Distinct qualified id's are not compatible. 2520 return QualType(); 2521 default: 2522 assert(0 && "unexpected type"); 2523 return QualType(); 2524 } 2525} 2526 2527//===----------------------------------------------------------------------===// 2528// Integer Predicates 2529//===----------------------------------------------------------------------===// 2530 2531unsigned ASTContext::getIntWidth(QualType T) { 2532 if (T == BoolTy) 2533 return 1; 2534 // At the moment, only bool has padding bits 2535 return (unsigned)getTypeSize(T); 2536} 2537 2538QualType ASTContext::getCorrespondingUnsignedType(QualType T) { 2539 assert(T->isSignedIntegerType() && "Unexpected type"); 2540 if (const EnumType* ETy = T->getAsEnumType()) 2541 T = ETy->getDecl()->getIntegerType(); 2542 const BuiltinType* BTy = T->getAsBuiltinType(); 2543 assert (BTy && "Unexpected signed integer type"); 2544 switch (BTy->getKind()) { 2545 case BuiltinType::Char_S: 2546 case BuiltinType::SChar: 2547 return UnsignedCharTy; 2548 case BuiltinType::Short: 2549 return UnsignedShortTy; 2550 case BuiltinType::Int: 2551 return UnsignedIntTy; 2552 case BuiltinType::Long: 2553 return UnsignedLongTy; 2554 case BuiltinType::LongLong: 2555 return UnsignedLongLongTy; 2556 default: 2557 assert(0 && "Unexpected signed integer type"); 2558 return QualType(); 2559 } 2560} 2561 2562 2563//===----------------------------------------------------------------------===// 2564// Serialization Support 2565//===----------------------------------------------------------------------===// 2566 2567/// Emit - Serialize an ASTContext object to Bitcode. 2568void ASTContext::Emit(llvm::Serializer& S) const { 2569 S.Emit(LangOpts); 2570 S.EmitRef(SourceMgr); 2571 S.EmitRef(Target); 2572 S.EmitRef(Idents); 2573 S.EmitRef(Selectors); 2574 2575 // Emit the size of the type vector so that we can reserve that size 2576 // when we reconstitute the ASTContext object. 2577 S.EmitInt(Types.size()); 2578 2579 for (std::vector<Type*>::const_iterator I=Types.begin(), E=Types.end(); 2580 I!=E;++I) 2581 (*I)->Emit(S); 2582 2583 S.EmitOwnedPtr(TUDecl); 2584 2585 // FIXME: S.EmitOwnedPtr(CFConstantStringTypeDecl); 2586} 2587 2588ASTContext* ASTContext::Create(llvm::Deserializer& D) { 2589 2590 // Read the language options. 2591 LangOptions LOpts; 2592 LOpts.Read(D); 2593 2594 SourceManager &SM = D.ReadRef<SourceManager>(); 2595 TargetInfo &t = D.ReadRef<TargetInfo>(); 2596 IdentifierTable &idents = D.ReadRef<IdentifierTable>(); 2597 SelectorTable &sels = D.ReadRef<SelectorTable>(); 2598 2599 unsigned size_reserve = D.ReadInt(); 2600 2601 ASTContext* A = new ASTContext(LOpts, SM, t, idents, sels, 2602 size_reserve); 2603 2604 for (unsigned i = 0; i < size_reserve; ++i) 2605 Type::Create(*A,i,D); 2606 2607 A->TUDecl = cast<TranslationUnitDecl>(D.ReadOwnedPtr<Decl>(*A)); 2608 2609 // FIXME: A->CFConstantStringTypeDecl = D.ReadOwnedPtr<RecordDecl>(); 2610 2611 return A; 2612} 2613