ASTContext.h revision f3710babc1ba40779c0fc64e6657cfc84dee7545
1//===--- ASTContext.h - Context to hold long-lived AST nodes ----*- C++ -*-===// 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 defines the ASTContext interface. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_ASTCONTEXT_H 15#define LLVM_CLANG_AST_ASTCONTEXT_H 16 17#include "clang/Basic/IdentifierTable.h" 18#include "clang/Basic/LangOptions.h" 19#include "clang/AST/Builtins.h" 20#include "clang/AST/DeclarationName.h" 21#include "clang/AST/DeclBase.h" 22#include "clang/AST/Type.h" 23#include "clang/Basic/SourceLocation.h" 24#include "llvm/ADT/DenseMap.h" 25#include "llvm/ADT/FoldingSet.h" 26#include "llvm/Bitcode/SerializationFwd.h" 27#include "llvm/Support/Allocator.h" 28#include <vector> 29 30namespace llvm { 31 struct fltSemantics; 32} 33 34namespace clang { 35 class ASTRecordLayout; 36 class Expr; 37 class IdentifierTable; 38 class SelectorTable; 39 class SourceManager; 40 class TargetInfo; 41 // Decls 42 class Decl; 43 class ObjCPropertyDecl; 44 class RecordDecl; 45 class TagDecl; 46 class TranslationUnitDecl; 47 class TypeDecl; 48 class TypedefDecl; 49 class TemplateTypeParmDecl; 50 class FieldDecl; 51 class ObjCIvarRefExpr; 52 class ObjCIvarDecl; 53 54/// ASTContext - This class holds long-lived AST nodes (such as types and 55/// decls) that can be referred to throughout the semantic analysis of a file. 56class ASTContext { 57 std::vector<Type*> Types; 58 llvm::FoldingSet<ASQualType> ASQualTypes; 59 llvm::FoldingSet<ComplexType> ComplexTypes; 60 llvm::FoldingSet<PointerType> PointerTypes; 61 llvm::FoldingSet<BlockPointerType> BlockPointerTypes; 62 llvm::FoldingSet<ReferenceType> ReferenceTypes; 63 llvm::FoldingSet<MemberPointerType> MemberPointerTypes; 64 llvm::FoldingSet<ConstantArrayType> ConstantArrayTypes; 65 llvm::FoldingSet<IncompleteArrayType> IncompleteArrayTypes; 66 std::vector<VariableArrayType*> VariableArrayTypes; 67 std::vector<DependentSizedArrayType*> DependentSizedArrayTypes; 68 llvm::FoldingSet<VectorType> VectorTypes; 69 llvm::FoldingSet<FunctionTypeNoProto> FunctionTypeNoProtos; 70 llvm::FoldingSet<FunctionTypeProto> FunctionTypeProtos; 71 llvm::FoldingSet<TemplateTypeParmType> TemplateTypeParmTypes; 72 llvm::FoldingSet<ClassTemplateSpecializationType> 73 ClassTemplateSpecializationTypes; 74 llvm::FoldingSet<ObjCQualifiedInterfaceType> ObjCQualifiedInterfaceTypes; 75 llvm::FoldingSet<ObjCQualifiedIdType> ObjCQualifiedIdTypes; 76 /// ASTRecordLayouts - A cache mapping from RecordDecls to ASTRecordLayouts. 77 /// This is lazily created. This is intentionally not serialized. 78 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*> ASTRecordLayouts; 79 llvm::DenseMap<const ObjCInterfaceDecl*, 80 const ASTRecordLayout*> ASTObjCInterfaces; 81 82 llvm::DenseMap<unsigned, FixedWidthIntType*> SignedFixedWidthIntTypes; 83 llvm::DenseMap<unsigned, FixedWidthIntType*> UnsignedFixedWidthIntTypes; 84 85 // FIXME: Shouldn't ASTRecordForInterface/ASTFieldForIvarRef and 86 // addRecordToClass/getFieldDecl be part of the backend (i.e. CodeGenTypes and 87 // CodeGenFunction)? 88 llvm::DenseMap<const ObjCInterfaceDecl*, 89 const RecordDecl*> ASTRecordForInterface; 90 llvm::DenseMap<const ObjCIvarRefExpr*, const FieldDecl*> ASTFieldForIvarRef; 91 92 /// BuiltinVaListType - built-in va list type. 93 /// This is initially null and set by Sema::LazilyCreateBuiltin when 94 /// a builtin that takes a valist is encountered. 95 QualType BuiltinVaListType; 96 97 /// ObjCIdType - a pseudo built-in typedef type (set by Sema). 98 QualType ObjCIdType; 99 const RecordType *IdStructType; 100 101 /// ObjCSelType - another pseudo built-in typedef type (set by Sema). 102 QualType ObjCSelType; 103 const RecordType *SelStructType; 104 105 /// ObjCProtoType - another pseudo built-in typedef type (set by Sema). 106 QualType ObjCProtoType; 107 const RecordType *ProtoStructType; 108 109 /// ObjCClassType - another pseudo built-in typedef type (set by Sema). 110 QualType ObjCClassType; 111 const RecordType *ClassStructType; 112 113 QualType ObjCConstantStringType; 114 RecordDecl *CFConstantStringTypeDecl; 115 116 RecordDecl *ObjCFastEnumerationStateTypeDecl; 117 118 TranslationUnitDecl *TUDecl; 119 120 /// SourceMgr - The associated SourceManager object. 121 SourceManager &SourceMgr; 122 123 /// LangOpts - The language options used to create the AST associated with 124 /// this ASTContext object. 125 LangOptions LangOpts; 126 127 /// MallocAlloc/BumpAlloc - The allocator objects used to create AST objects. 128 bool FreeMemory; 129 llvm::MallocAllocator MallocAlloc; 130 llvm::BumpPtrAllocator BumpAlloc; 131public: 132 TargetInfo &Target; 133 IdentifierTable &Idents; 134 SelectorTable &Selectors; 135 DeclarationNameTable DeclarationNames; 136 137 SourceManager& getSourceManager() { return SourceMgr; } 138 void *Allocate(unsigned Size, unsigned Align = 8) { 139 return FreeMemory ? MallocAlloc.Allocate(Size, Align) : 140 BumpAlloc.Allocate(Size, Align); 141 } 142 void Deallocate(void *Ptr) { 143 if (FreeMemory) 144 MallocAlloc.Deallocate(Ptr); 145 } 146 const LangOptions& getLangOptions() const { return LangOpts; } 147 148 FullSourceLoc getFullLoc(SourceLocation Loc) const { 149 return FullSourceLoc(Loc,SourceMgr); 150 } 151 152 TranslationUnitDecl *getTranslationUnitDecl() const { return TUDecl; } 153 154 /// This is intentionally not serialized. It is populated by the 155 /// ASTContext ctor, and there are no external pointers/references to 156 /// internal variables of BuiltinInfo. 157 Builtin::Context BuiltinInfo; 158 159 // Builtin Types. 160 QualType VoidTy; 161 QualType BoolTy; 162 QualType CharTy; 163 QualType WCharTy; // [C++ 3.9.1p5] 164 QualType SignedCharTy, ShortTy, IntTy, LongTy, LongLongTy; 165 QualType UnsignedCharTy, UnsignedShortTy, UnsignedIntTy, UnsignedLongTy; 166 QualType UnsignedLongLongTy; 167 QualType FloatTy, DoubleTy, LongDoubleTy; 168 QualType FloatComplexTy, DoubleComplexTy, LongDoubleComplexTy; 169 QualType VoidPtrTy; 170 QualType OverloadTy; 171 QualType DependentTy; 172 173 ASTContext(const LangOptions& LOpts, SourceManager &SM, TargetInfo &t, 174 IdentifierTable &idents, SelectorTable &sels, 175 bool FreeMemory = true, unsigned size_reserve=0); 176 177 ~ASTContext(); 178 179 void PrintStats() const; 180 const std::vector<Type*>& getTypes() const { return Types; } 181 182 //===--------------------------------------------------------------------===// 183 // Type Constructors 184 //===--------------------------------------------------------------------===// 185 186 /// getASQualType - Return the uniqued reference to the type for an address 187 /// space qualified type with the specified type and address space. The 188 /// resulting type has a union of the qualifiers from T and the address space. 189 // If T already has an address space specifier, it is silently replaced. 190 QualType getASQualType(QualType T, unsigned AddressSpace); 191 192 /// getComplexType - Return the uniqued reference to the type for a complex 193 /// number with the specified element type. 194 QualType getComplexType(QualType T); 195 196 /// getPointerType - Return the uniqued reference to the type for a pointer to 197 /// the specified type. 198 QualType getPointerType(QualType T); 199 200 /// getBlockPointerType - Return the uniqued reference to the type for a block 201 /// of the specified type. 202 QualType getBlockPointerType(QualType T); 203 204 /// getReferenceType - Return the uniqued reference to the type for a 205 /// reference to the specified type. 206 QualType getReferenceType(QualType T); 207 208 /// getMemberPointerType - Return the uniqued reference to the type for a 209 /// member pointer to the specified type in the specified class. The class 210 /// is a Type because it could be a dependent name. 211 QualType getMemberPointerType(QualType T, const Type *Cls); 212 213 /// getVariableArrayType - Returns a non-unique reference to the type for a 214 /// variable array of the specified element type. 215 QualType getVariableArrayType(QualType EltTy, Expr *NumElts, 216 ArrayType::ArraySizeModifier ASM, 217 unsigned EltTypeQuals); 218 219 /// getDependentSizedArrayType - Returns a non-unique reference to 220 /// the type for a dependently-sized array of the specified element 221 /// type. FIXME: We will need these to be uniqued, or at least 222 /// comparable, at some point. 223 QualType getDependentSizedArrayType(QualType EltTy, Expr *NumElts, 224 ArrayType::ArraySizeModifier ASM, 225 unsigned EltTypeQuals); 226 227 /// getIncompleteArrayType - Returns a unique reference to the type for a 228 /// incomplete array of the specified element type. 229 QualType getIncompleteArrayType(QualType EltTy, 230 ArrayType::ArraySizeModifier ASM, 231 unsigned EltTypeQuals); 232 233 /// getConstantArrayType - Return the unique reference to the type for a 234 /// constant array of the specified element type. 235 QualType getConstantArrayType(QualType EltTy, const llvm::APInt &ArySize, 236 ArrayType::ArraySizeModifier ASM, 237 unsigned EltTypeQuals); 238 239 /// getVectorType - Return the unique reference to a vector type of 240 /// the specified element type and size. VectorType must be a built-in type. 241 QualType getVectorType(QualType VectorType, unsigned NumElts); 242 243 /// getExtVectorType - Return the unique reference to an extended vector type 244 /// of the specified element type and size. VectorType must be a built-in 245 /// type. 246 QualType getExtVectorType(QualType VectorType, unsigned NumElts); 247 248 /// getFunctionTypeNoProto - Return a K&R style C function type like 'int()'. 249 /// 250 QualType getFunctionTypeNoProto(QualType ResultTy); 251 252 /// getFunctionType - Return a normal function type with a typed argument 253 /// list. isVariadic indicates whether the argument list includes '...'. 254 QualType getFunctionType(QualType ResultTy, const QualType *ArgArray, 255 unsigned NumArgs, bool isVariadic, 256 unsigned TypeQuals); 257 258 /// getTypeDeclType - Return the unique reference to the type for 259 /// the specified type declaration. 260 QualType getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl=0); 261 262 /// getTypedefType - Return the unique reference to the type for the 263 /// specified typename decl. 264 QualType getTypedefType(TypedefDecl *Decl); 265 QualType getObjCInterfaceType(ObjCInterfaceDecl *Decl); 266 QualType buildObjCInterfaceType(ObjCInterfaceDecl *Decl); 267 268 QualType getTemplateTypeParmType(unsigned Depth, unsigned Index, 269 IdentifierInfo *Name = 0); 270 271 QualType getClassTemplateSpecializationType(TemplateDecl *Template, 272 unsigned NumArgs, 273 uintptr_t *Args, bool *ArgIsType, 274 QualType Canon); 275 276 /// getObjCQualifiedInterfaceType - Return a 277 /// ObjCQualifiedInterfaceType type for the given interface decl and 278 /// the conforming protocol list. 279 QualType getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 280 ObjCProtocolDecl **ProtocolList, unsigned NumProtocols); 281 282 /// getObjCQualifiedIdType - Return an ObjCQualifiedIdType for a 283 /// given 'id' and conforming protocol list. 284 QualType getObjCQualifiedIdType(ObjCProtocolDecl **ProtocolList, 285 unsigned NumProtocols); 286 287 288 /// getTypeOfType - GCC extension. 289 QualType getTypeOfExpr(Expr *e); 290 QualType getTypeOfType(QualType t); 291 292 /// getTagDeclType - Return the unique reference to the type for the 293 /// specified TagDecl (struct/union/class/enum) decl. 294 QualType getTagDeclType(TagDecl *Decl); 295 296 /// getSizeType - Return the unique type for "size_t" (C99 7.17), defined 297 /// in <stddef.h>. The sizeof operator requires this (C99 6.5.3.4p4). 298 QualType getSizeType() const; 299 300 /// getWCharType - Return the unique type for "wchar_t" (C99 7.17), defined 301 /// in <stddef.h>. Wide strings require this (C99 6.4.5p5). 302 QualType getWCharType() const; 303 304 /// getSignedWCharType - Return the type of "signed wchar_t". 305 /// Used when in C++, as a GCC extension. 306 QualType getSignedWCharType() const; 307 308 /// getUnsignedWCharType - Return the type of "unsigned wchar_t". 309 /// Used when in C++, as a GCC extension. 310 QualType getUnsignedWCharType() const; 311 312 /// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 313 /// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 314 QualType getPointerDiffType() const; 315 316 // getCFConstantStringType - Return the C structure type used to represent 317 // constant CFStrings. 318 QualType getCFConstantStringType(); 319 320 // This setter/getter represents the ObjC type for an NSConstantString. 321 void setObjCConstantStringInterface(ObjCInterfaceDecl *Decl); 322 QualType getObjCConstantStringInterface() const { 323 return ObjCConstantStringType; 324 } 325 326 //// This gets the struct used to keep track of fast enumerations. 327 QualType getObjCFastEnumerationStateType(); 328 329 /// getObjCEncodingForType - Emit the ObjC type encoding for the 330 /// given type into \arg S. If \arg NameFields is specified then 331 /// record field names are also encoded. 332 void getObjCEncodingForType(QualType t, std::string &S, 333 FieldDecl *Field=NULL) const; 334 335 void getLegacyIntegralTypeEncoding(QualType &t) const; 336 337 // Put the string version of type qualifiers into S. 338 void getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 339 std::string &S) const; 340 341 /// getObjCEncodingForMethodDecl - Return the encoded type for this method 342 /// declaration. 343 void getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, std::string &S); 344 345 /// getObjCEncodingForPropertyDecl - Return the encoded type for 346 /// this method declaration. If non-NULL, Container must be either 347 /// an ObjCCategoryImplDecl or ObjCImplementationDecl; it should 348 /// only be NULL when getting encodings for protocol properties. 349 void getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 350 const Decl *Container, 351 std::string &S); 352 353 /// getObjCEncodingTypeSize returns size of type for objective-c encoding 354 /// purpose. 355 int getObjCEncodingTypeSize(QualType t); 356 357 /// This setter/getter represents the ObjC 'id' type. It is setup lazily, by 358 /// Sema. id is always a (typedef for a) pointer type, a pointer to a struct. 359 QualType getObjCIdType() const { return ObjCIdType; } 360 void setObjCIdType(TypedefDecl *Decl); 361 362 void setObjCSelType(TypedefDecl *Decl); 363 QualType getObjCSelType() const { return ObjCSelType; } 364 365 void setObjCProtoType(QualType QT); 366 QualType getObjCProtoType() const { return ObjCProtoType; } 367 368 /// This setter/getter repreents the ObjC 'Class' type. It is setup lazily, by 369 /// Sema. 'Class' is always a (typedef for a) pointer type, a pointer to a 370 /// struct. 371 QualType getObjCClassType() const { return ObjCClassType; } 372 void setObjCClassType(TypedefDecl *Decl); 373 374 void setBuiltinVaListType(QualType T); 375 QualType getBuiltinVaListType() const { return BuiltinVaListType; } 376 377 QualType getFixedWidthIntType(unsigned Width, bool Signed); 378 379private: 380 QualType getFromTargetType(unsigned Type) const; 381 382 //===--------------------------------------------------------------------===// 383 // Type Predicates. 384 //===--------------------------------------------------------------------===// 385 386public: 387 /// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 388 /// to an object type. This includes "id" and "Class" (two 'special' pointers 389 /// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 390 /// ID type). 391 bool isObjCObjectPointerType(QualType Ty) const; 392 393 /// isObjCNSObjectType - Return true if this is an NSObject object with 394 /// its NSObject attribute set. 395 bool isObjCNSObjectType(QualType Ty) const; 396 397 //===--------------------------------------------------------------------===// 398 // Type Sizing and Analysis 399 //===--------------------------------------------------------------------===// 400 401 /// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 402 /// scalar floating point type. 403 const llvm::fltSemantics &getFloatTypeSemantics(QualType T) const; 404 405 /// getTypeInfo - Get the size and alignment of the specified complete type in 406 /// bits. 407 std::pair<uint64_t, unsigned> getTypeInfo(const Type *T); 408 std::pair<uint64_t, unsigned> getTypeInfo(QualType T) { 409 return getTypeInfo(T.getTypePtr()); 410 } 411 412 /// getTypeSize - Return the size of the specified type, in bits. This method 413 /// does not work on incomplete types. 414 uint64_t getTypeSize(QualType T) { 415 return getTypeInfo(T).first; 416 } 417 uint64_t getTypeSize(const Type *T) { 418 return getTypeInfo(T).first; 419 } 420 421 /// getTypeAlign - Return the ABI-specified alignment of a type, in bits. 422 /// This method does not work on incomplete types. 423 unsigned getTypeAlign(QualType T) { 424 return getTypeInfo(T).second; 425 } 426 unsigned getTypeAlign(const Type *T) { 427 return getTypeInfo(T).second; 428 } 429 430 /// getPreferredTypeAlign - Return the "preferred" alignment of the specified 431 /// type for the current target in bits. This can be different than the ABI 432 /// alignment in cases where it is beneficial for performance to overalign 433 /// a data type. 434 unsigned getPreferredTypeAlign(const Type *T); 435 436 /// getDeclAlign - Return the alignment of the specified decl that should be 437 /// returned by __alignof(). Note that bitfields do not have a valid 438 /// alignment, so this method will assert on them. 439 unsigned getDeclAlign(const Decl *D); 440 441 /// getASTRecordLayout - Get or compute information about the layout of the 442 /// specified record (struct/union/class), which indicates its size and field 443 /// position information. 444 const ASTRecordLayout &getASTRecordLayout(const RecordDecl *D); 445 446 const ASTRecordLayout &getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D); 447 const RecordDecl *addRecordToClass(const ObjCInterfaceDecl *D); 448 const FieldDecl *getFieldDecl(const ObjCIvarRefExpr *MRef) { 449 llvm::DenseMap<const ObjCIvarRefExpr *, const FieldDecl*>::iterator I 450 = ASTFieldForIvarRef.find(MRef); 451 assert (I != ASTFieldForIvarRef.end() && "Unable to find field_decl"); 452 return I->second; 453 } 454 void setFieldDecl(const ObjCInterfaceDecl *OI, 455 const ObjCIvarDecl *Ivar, 456 const ObjCIvarRefExpr *MRef); 457 //===--------------------------------------------------------------------===// 458 // Type Operators 459 //===--------------------------------------------------------------------===// 460 461 /// getCanonicalType - Return the canonical (structural) type corresponding to 462 /// the specified potentially non-canonical type. The non-canonical version 463 /// of a type may have many "decorated" versions of types. Decorators can 464 /// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 465 /// to be free of any of these, allowing two canonical types to be compared 466 /// for exact equality with a simple pointer comparison. 467 QualType getCanonicalType(QualType T); 468 const Type *getCanonicalType(const Type *T) { 469 return T->getCanonicalTypeInternal().getTypePtr(); 470 } 471 472 /// \brief Determine whether the given types are equivalent. 473 bool hasSameType(QualType T1, QualType T2) { 474 return getCanonicalType(T1) == getCanonicalType(T2); 475 } 476 477 /// \brief Determine whether the given types are equivalent after 478 /// cvr-qualifiers have been removed. 479 bool hasSameUnqualifiedType(QualType T1, QualType T2) { 480 T1 = getCanonicalType(T1); 481 T2 = getCanonicalType(T2); 482 return T1.getUnqualifiedType() == T2.getUnqualifiedType(); 483 } 484 485 /// \brief Retrieves the "canonical" declaration of the given tag 486 /// declaration. 487 /// 488 /// The canonical declaration for the given tag declaration is 489 /// either the definition of the tag (if it is a complete type) or 490 /// the first declaration of that tag. 491 TagDecl *getCanonicalDecl(TagDecl *Tag) { 492 QualType T = getTagDeclType(Tag); 493 return cast<TagDecl>(cast<TagType>(T)->getDecl()); 494 } 495 496 /// Type Query functions. If the type is an instance of the specified class, 497 /// return the Type pointer for the underlying maximally pretty type. This 498 /// is a member of ASTContext because this may need to do some amount of 499 /// canonicalization, e.g. to move type qualifiers into the element type. 500 const ArrayType *getAsArrayType(QualType T); 501 const ConstantArrayType *getAsConstantArrayType(QualType T) { 502 return dyn_cast_or_null<ConstantArrayType>(getAsArrayType(T)); 503 } 504 const VariableArrayType *getAsVariableArrayType(QualType T) { 505 return dyn_cast_or_null<VariableArrayType>(getAsArrayType(T)); 506 } 507 const IncompleteArrayType *getAsIncompleteArrayType(QualType T) { 508 return dyn_cast_or_null<IncompleteArrayType>(getAsArrayType(T)); 509 } 510 511 /// getBaseElementType - Returns the innermost element type of a variable 512 /// length array type. For example, will return "int" for int[m][n] 513 QualType getBaseElementType(const VariableArrayType *VAT); 514 515 /// getArrayDecayedType - Return the properly qualified result of decaying the 516 /// specified array type to a pointer. This operation is non-trivial when 517 /// handling typedefs etc. The canonical type of "T" must be an array type, 518 /// this returns a pointer to a properly qualified element of the array. 519 /// 520 /// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 521 QualType getArrayDecayedType(QualType T); 522 523 /// getIntegerTypeOrder - Returns the highest ranked integer type: 524 /// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 525 /// LHS < RHS, return -1. 526 int getIntegerTypeOrder(QualType LHS, QualType RHS); 527 528 /// getFloatingTypeOrder - Compare the rank of the two specified floating 529 /// point types, ignoring the domain of the type (i.e. 'double' == 530 /// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 531 /// LHS < RHS, return -1. 532 int getFloatingTypeOrder(QualType LHS, QualType RHS); 533 534 /// getFloatingTypeOfSizeWithinDomain - Returns a real floating 535 /// point or a complex type (based on typeDomain/typeSize). 536 /// 'typeDomain' is a real floating point or complex type. 537 /// 'typeSize' is a real floating point or complex type. 538 QualType getFloatingTypeOfSizeWithinDomain(QualType typeSize, 539 QualType typeDomain) const; 540 541private: 542 // Helper for integer ordering 543 unsigned getIntegerRank(Type* T); 544 545public: 546 547 //===--------------------------------------------------------------------===// 548 // Type Compatibility Predicates 549 //===--------------------------------------------------------------------===// 550 551 /// Compatibility predicates used to check assignment expressions. 552 bool typesAreCompatible(QualType, QualType); // C99 6.2.7p1 553 bool typesAreBlockCompatible(QualType lhs, QualType rhs); 554 555 bool isObjCIdType(QualType T) const { 556 return T == ObjCIdType; 557 } 558 bool isObjCIdStructType(QualType T) const { 559 if (!IdStructType) // ObjC isn't enabled 560 return false; 561 return T->getAsStructureType() == IdStructType; 562 } 563 bool isObjCClassType(QualType T) const { 564 return T == ObjCClassType; 565 } 566 bool isObjCClassStructType(QualType T) const { 567 if (!ClassStructType) // ObjC isn't enabled 568 return false; 569 return T->getAsStructureType() == ClassStructType; 570 } 571 bool isObjCSelType(QualType T) const { 572 assert(SelStructType && "isObjCSelType used before 'SEL' type is built"); 573 return T->getAsStructureType() == SelStructType; 574 } 575 576 // Check the safety of assignment from LHS to RHS 577 bool canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 578 const ObjCInterfaceType *RHS); 579 bool areComparableObjCPointerTypes(QualType LHS, QualType RHS); 580 581 // Functions for calculating composite types 582 QualType mergeTypes(QualType, QualType); 583 QualType mergeFunctionTypes(QualType, QualType); 584 585 //===--------------------------------------------------------------------===// 586 // Integer Predicates 587 //===--------------------------------------------------------------------===// 588 589 // The width of an integer, as defined in C99 6.2.6.2. This is the number 590 // of bits in an integer type excluding any padding bits. 591 unsigned getIntWidth(QualType T); 592 593 // Per C99 6.2.5p6, for every signed integer type, there is a corresponding 594 // unsigned integer type. This method takes a signed type, and returns the 595 // corresponding unsigned integer type. 596 QualType getCorrespondingUnsignedType(QualType T); 597 598 //===--------------------------------------------------------------------===// 599 // Type Iterators. 600 //===--------------------------------------------------------------------===// 601 602 typedef std::vector<Type*>::iterator type_iterator; 603 typedef std::vector<Type*>::const_iterator const_type_iterator; 604 605 type_iterator types_begin() { return Types.begin(); } 606 type_iterator types_end() { return Types.end(); } 607 const_type_iterator types_begin() const { return Types.begin(); } 608 const_type_iterator types_end() const { return Types.end(); } 609 610 //===--------------------------------------------------------------------===// 611 // Serialization 612 //===--------------------------------------------------------------------===// 613 614 void Emit(llvm::Serializer& S) const; 615 static ASTContext* Create(llvm::Deserializer& D); 616 617private: 618 ASTContext(const ASTContext&); // DO NOT IMPLEMENT 619 void operator=(const ASTContext&); // DO NOT IMPLEMENT 620 621 void InitBuiltinTypes(); 622 void InitBuiltinType(QualType &R, BuiltinType::Kind K); 623 624 // Return the ObjC type encoding for a given type. 625 void getObjCEncodingForTypeImpl(QualType t, std::string &S, 626 bool ExpandPointedToStructures, 627 bool ExpandStructures, 628 FieldDecl *Field, 629 bool OutermostType = false, 630 bool EncodingProperty = false) const; 631 632}; 633 634} // end namespace clang 635 636// operator new and delete aren't allowed inside namespaces. 637// The throw specifications are mandated by the standard. 638/// @brief Placement new for using the ASTContext's allocator. 639/// 640/// This placement form of operator new uses the ASTContext's allocator for 641/// obtaining memory. It is a non-throwing new, which means that it returns 642/// null on error. (If that is what the allocator does. The current does, so if 643/// this ever changes, this operator will have to be changed, too.) 644/// Usage looks like this (assuming there's an ASTContext 'Context' in scope): 645/// @code 646/// // Default alignment (16) 647/// IntegerLiteral *Ex = new (Context) IntegerLiteral(arguments); 648/// // Specific alignment 649/// IntegerLiteral *Ex2 = new (Context, 8) IntegerLiteral(arguments); 650/// @endcode 651/// Please note that you cannot use delete on the pointer; it must be 652/// deallocated using an explicit destructor call followed by 653/// @c Context.Deallocate(Ptr). 654/// 655/// @param Bytes The number of bytes to allocate. Calculated by the compiler. 656/// @param C The ASTContext that provides the allocator. 657/// @param Alignment The alignment of the allocated memory (if the underlying 658/// allocator supports it). 659/// @return The allocated memory. Could be NULL. 660inline void *operator new(size_t Bytes, clang::ASTContext &C, 661 size_t Alignment = 16) throw () { 662 return C.Allocate(Bytes, Alignment); 663} 664/// @brief Placement delete companion to the new above. 665/// 666/// This operator is just a companion to the new above. There is no way of 667/// invoking it directly; see the new operator for more details. This operator 668/// is called implicitly by the compiler if a placement new expression using 669/// the ASTContext throws in the object constructor. 670inline void operator delete(void *Ptr, clang::ASTContext &C) 671 throw () { 672 C.Deallocate(Ptr); 673} 674 675/// This placement form of operator new[] uses the ASTContext's allocator for 676/// obtaining memory. It is a non-throwing new[], which means that it returns 677/// null on error. 678/// Usage looks like this (assuming there's an ASTContext 'Context' in scope): 679/// @code 680/// // Default alignment (16) 681/// char *data = new (Context) char[10]; 682/// // Specific alignment 683/// char *data = new (Context, 8) char[10]; 684/// @endcode 685/// Please note that you cannot use delete on the pointer; it must be 686/// deallocated using an explicit destructor call followed by 687/// @c Context.Deallocate(Ptr). 688/// 689/// @param Bytes The number of bytes to allocate. Calculated by the compiler. 690/// @param C The ASTContext that provides the allocator. 691/// @param Alignment The alignment of the allocated memory (if the underlying 692/// allocator supports it). 693/// @return The allocated memory. Could be NULL. 694inline void *operator new[](size_t Bytes, clang::ASTContext& C, 695 size_t Alignment = 16) throw () { 696 return C.Allocate(Bytes, Alignment); 697} 698 699/// @brief Placement delete[] companion to the new[] above. 700/// 701/// This operator is just a companion to the new[] above. There is no way of 702/// invoking it directly; see the new[] operator for more details. This operator 703/// is called implicitly by the compiler if a placement new[] expression using 704/// the ASTContext throws in the object constructor. 705inline void operator delete[](void *Ptr, clang::ASTContext &C) throw () { 706 C.Deallocate(Ptr); 707} 708 709#endif 710