ASTContext.h revision 8e6563ba097732dc1fffcfc85f8dbbceac899a80
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 // FIXME: Shouldn't ASTRecordForInterface/ASTFieldForIvarRef and 83 // addRecordToClass/getFieldDecl be part of the backend (i.e. CodeGenTypes and 84 // CodeGenFunction)? 85 llvm::DenseMap<const ObjCInterfaceDecl*, 86 const RecordDecl*> ASTRecordForInterface; 87 llvm::DenseMap<const ObjCIvarRefExpr*, const FieldDecl*> ASTFieldForIvarRef; 88 89 /// BuiltinVaListType - built-in va list type. 90 /// This is initially null and set by Sema::LazilyCreateBuiltin when 91 /// a builtin that takes a valist is encountered. 92 QualType BuiltinVaListType; 93 94 /// ObjCIdType - a pseudo built-in typedef type (set by Sema). 95 QualType ObjCIdType; 96 const RecordType *IdStructType; 97 98 /// ObjCSelType - another pseudo built-in typedef type (set by Sema). 99 QualType ObjCSelType; 100 const RecordType *SelStructType; 101 102 /// ObjCProtoType - another pseudo built-in typedef type (set by Sema). 103 QualType ObjCProtoType; 104 const RecordType *ProtoStructType; 105 106 /// ObjCClassType - another pseudo built-in typedef type (set by Sema). 107 QualType ObjCClassType; 108 const RecordType *ClassStructType; 109 110 QualType ObjCConstantStringType; 111 RecordDecl *CFConstantStringTypeDecl; 112 113 RecordDecl *ObjCFastEnumerationStateTypeDecl; 114 115 TranslationUnitDecl *TUDecl; 116 117 /// SourceMgr - The associated SourceManager object. 118 SourceManager &SourceMgr; 119 120 /// LangOpts - The language options used to create the AST associated with 121 /// this ASTContext object. 122 LangOptions LangOpts; 123 124 /// MallocAlloc/BumpAlloc - The allocator objects used to create AST objects. 125 bool FreeMemory; 126 llvm::MallocAllocator MallocAlloc; 127 llvm::BumpPtrAllocator BumpAlloc; 128public: 129 TargetInfo &Target; 130 IdentifierTable &Idents; 131 SelectorTable &Selectors; 132 DeclarationNameTable DeclarationNames; 133 134 SourceManager& getSourceManager() { return SourceMgr; } 135 void *Allocate(unsigned Size, unsigned Align = 8) { 136 return FreeMemory ? MallocAlloc.Allocate(Size, Align) : 137 BumpAlloc.Allocate(Size, Align); 138 } 139 void Deallocate(void *Ptr) { 140 if (FreeMemory) 141 MallocAlloc.Deallocate(Ptr); 142 } 143 const LangOptions& getLangOptions() const { return LangOpts; } 144 145 FullSourceLoc getFullLoc(SourceLocation Loc) const { 146 return FullSourceLoc(Loc,SourceMgr); 147 } 148 149 TranslationUnitDecl *getTranslationUnitDecl() const { return TUDecl; } 150 151 /// This is intentionally not serialized. It is populated by the 152 /// ASTContext ctor, and there are no external pointers/references to 153 /// internal variables of BuiltinInfo. 154 Builtin::Context BuiltinInfo; 155 156 // Builtin Types. 157 QualType VoidTy; 158 QualType BoolTy; 159 QualType CharTy; 160 QualType WCharTy; // [C++ 3.9.1p5] 161 QualType SignedCharTy, ShortTy, IntTy, LongTy, LongLongTy; 162 QualType UnsignedCharTy, UnsignedShortTy, UnsignedIntTy, UnsignedLongTy; 163 QualType UnsignedLongLongTy; 164 QualType FloatTy, DoubleTy, LongDoubleTy; 165 QualType FloatComplexTy, DoubleComplexTy, LongDoubleComplexTy; 166 QualType VoidPtrTy; 167 QualType OverloadTy; 168 QualType DependentTy; 169 170 ASTContext(const LangOptions& LOpts, SourceManager &SM, TargetInfo &t, 171 IdentifierTable &idents, SelectorTable &sels, 172 bool FreeMemory = true, unsigned size_reserve=0); 173 174 ~ASTContext(); 175 176 void PrintStats() const; 177 const std::vector<Type*>& getTypes() const { return Types; } 178 179 //===--------------------------------------------------------------------===// 180 // Type Constructors 181 //===--------------------------------------------------------------------===// 182 183 /// getASQualType - Return the uniqued reference to the type for an address 184 /// space qualified type with the specified type and address space. The 185 /// resulting type has a union of the qualifiers from T and the address space. 186 // If T already has an address space specifier, it is silently replaced. 187 QualType getASQualType(QualType T, unsigned AddressSpace); 188 189 /// getComplexType - Return the uniqued reference to the type for a complex 190 /// number with the specified element type. 191 QualType getComplexType(QualType T); 192 193 /// getPointerType - Return the uniqued reference to the type for a pointer to 194 /// the specified type. 195 QualType getPointerType(QualType T); 196 197 /// getBlockPointerType - Return the uniqued reference to the type for a block 198 /// of the specified type. 199 QualType getBlockPointerType(QualType T); 200 201 /// getReferenceType - Return the uniqued reference to the type for a 202 /// reference to the specified type. 203 QualType getReferenceType(QualType T); 204 205 /// getMemberPointerType - Return the uniqued reference to the type for a 206 /// member pointer to the specified type in the specified class. The class 207 /// is a Type because it could be a dependent name. 208 QualType getMemberPointerType(QualType T, const Type *Cls); 209 210 /// getVariableArrayType - Returns a non-unique reference to the type for a 211 /// variable array of the specified element type. 212 QualType getVariableArrayType(QualType EltTy, Expr *NumElts, 213 ArrayType::ArraySizeModifier ASM, 214 unsigned EltTypeQuals); 215 216 /// getDependentSizedArrayType - Returns a non-unique reference to 217 /// the type for a dependently-sized array of the specified element 218 /// type. FIXME: We will need these to be uniqued, or at least 219 /// comparable, at some point. 220 QualType getDependentSizedArrayType(QualType EltTy, Expr *NumElts, 221 ArrayType::ArraySizeModifier ASM, 222 unsigned EltTypeQuals); 223 224 /// getIncompleteArrayType - Returns a unique reference to the type for a 225 /// incomplete array of the specified element type. 226 QualType getIncompleteArrayType(QualType EltTy, 227 ArrayType::ArraySizeModifier ASM, 228 unsigned EltTypeQuals); 229 230 /// getConstantArrayType - Return the unique reference to the type for a 231 /// constant array of the specified element type. 232 QualType getConstantArrayType(QualType EltTy, const llvm::APInt &ArySize, 233 ArrayType::ArraySizeModifier ASM, 234 unsigned EltTypeQuals); 235 236 /// getVectorType - Return the unique reference to a vector type of 237 /// the specified element type and size. VectorType must be a built-in type. 238 QualType getVectorType(QualType VectorType, unsigned NumElts); 239 240 /// getExtVectorType - Return the unique reference to an extended vector type 241 /// of the specified element type and size. VectorType must be a built-in 242 /// type. 243 QualType getExtVectorType(QualType VectorType, unsigned NumElts); 244 245 /// getFunctionTypeNoProto - Return a K&R style C function type like 'int()'. 246 /// 247 QualType getFunctionTypeNoProto(QualType ResultTy); 248 249 /// getFunctionType - Return a normal function type with a typed argument 250 /// list. isVariadic indicates whether the argument list includes '...'. 251 QualType getFunctionType(QualType ResultTy, const QualType *ArgArray, 252 unsigned NumArgs, bool isVariadic, 253 unsigned TypeQuals); 254 255 /// getTypeDeclType - Return the unique reference to the type for 256 /// the specified type declaration. 257 QualType getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl=0); 258 259 /// getTypedefType - Return the unique reference to the type for the 260 /// specified typename decl. 261 QualType getTypedefType(TypedefDecl *Decl); 262 QualType getObjCInterfaceType(ObjCInterfaceDecl *Decl); 263 264 QualType getTemplateTypeParmType(unsigned Depth, unsigned Index, 265 IdentifierInfo *Name = 0); 266 267 QualType getClassTemplateSpecializationType(TemplateDecl *Template, 268 unsigned NumArgs, 269 uintptr_t *Args, bool *ArgIsType, 270 QualType Canon); 271 272 /// getObjCQualifiedInterfaceType - Return a 273 /// ObjCQualifiedInterfaceType type for the given interface decl and 274 /// the conforming protocol list. 275 QualType getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 276 ObjCProtocolDecl **ProtocolList, unsigned NumProtocols); 277 278 /// getObjCQualifiedIdType - Return an ObjCQualifiedIdType for a 279 /// given 'id' and conforming protocol list. 280 QualType getObjCQualifiedIdType(ObjCProtocolDecl **ProtocolList, 281 unsigned NumProtocols); 282 283 284 /// getTypeOfType - GCC extension. 285 QualType getTypeOfExpr(Expr *e); 286 QualType getTypeOfType(QualType t); 287 288 /// getTagDeclType - Return the unique reference to the type for the 289 /// specified TagDecl (struct/union/class/enum) decl. 290 QualType getTagDeclType(TagDecl *Decl); 291 292 /// getSizeType - Return the unique type for "size_t" (C99 7.17), defined 293 /// in <stddef.h>. The sizeof operator requires this (C99 6.5.3.4p4). 294 QualType getSizeType() const; 295 296 /// getWCharType - Return the unique type for "wchar_t" (C99 7.17), defined 297 /// in <stddef.h>. Wide strings require this (C99 6.4.5p5). 298 QualType getWCharType() const; 299 300 /// getSignedWCharType - Return the type of "signed wchar_t". 301 /// Used when in C++, as a GCC extension. 302 QualType getSignedWCharType() const; 303 304 /// getUnsignedWCharType - Return the type of "unsigned wchar_t". 305 /// Used when in C++, as a GCC extension. 306 QualType getUnsignedWCharType() const; 307 308 /// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 309 /// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 310 QualType getPointerDiffType() const; 311 312 // getCFConstantStringType - Return the C structure type used to represent 313 // constant CFStrings. 314 QualType getCFConstantStringType(); 315 316 // This setter/getter represents the ObjC type for an NSConstantString. 317 void setObjCConstantStringInterface(ObjCInterfaceDecl *Decl); 318 QualType getObjCConstantStringInterface() const { 319 return ObjCConstantStringType; 320 } 321 322 //// This gets the struct used to keep track of fast enumerations. 323 QualType getObjCFastEnumerationStateType(); 324 325 /// getObjCEncodingForType - Emit the ObjC type encoding for the 326 /// given type into \arg S. If \arg NameFields is specified then 327 /// record field names are also encoded. 328 void getObjCEncodingForType(QualType t, std::string &S, 329 FieldDecl *Field=NULL) const; 330 331 void getLegacyIntegralTypeEncoding(QualType &t) const; 332 333 // Put the string version of type qualifiers into S. 334 void getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 335 std::string &S) const; 336 337 /// getObjCEncodingForMethodDecl - Return the encoded type for this method 338 /// declaration. 339 void getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, std::string &S); 340 341 /// getObjCEncodingForPropertyDecl - Return the encoded type for 342 /// this method declaration. If non-NULL, Container must be either 343 /// an ObjCCategoryImplDecl or ObjCImplementationDecl; it should 344 /// only be NULL when getting encodings for protocol properties. 345 void getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 346 const Decl *Container, 347 std::string &S); 348 349 /// getObjCEncodingTypeSize returns size of type for objective-c encoding 350 /// purpose. 351 int getObjCEncodingTypeSize(QualType t); 352 353 /// This setter/getter represents the ObjC 'id' type. It is setup lazily, by 354 /// Sema. id is always a (typedef for a) pointer type, a pointer to a struct. 355 QualType getObjCIdType() const { return ObjCIdType; } 356 void setObjCIdType(TypedefDecl *Decl); 357 358 void setObjCSelType(TypedefDecl *Decl); 359 QualType getObjCSelType() const { return ObjCSelType; } 360 361 void setObjCProtoType(QualType QT); 362 QualType getObjCProtoType() const { return ObjCProtoType; } 363 364 /// This setter/getter repreents the ObjC 'Class' type. It is setup lazily, by 365 /// Sema. 'Class' is always a (typedef for a) pointer type, a pointer to a 366 /// struct. 367 QualType getObjCClassType() const { return ObjCClassType; } 368 void setObjCClassType(TypedefDecl *Decl); 369 370 void setBuiltinVaListType(QualType T); 371 QualType getBuiltinVaListType() const { return BuiltinVaListType; } 372 373private: 374 QualType getFromTargetType(unsigned Type) const; 375 376 //===--------------------------------------------------------------------===// 377 // Type Predicates. 378 //===--------------------------------------------------------------------===// 379 380public: 381 /// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 382 /// to an object type. This includes "id" and "Class" (two 'special' pointers 383 /// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 384 /// ID type). 385 bool isObjCObjectPointerType(QualType Ty) const; 386 387 /// isObjCNSObjectType - Return true if this is an NSObject object with 388 /// its NSObject attribute set. 389 bool isObjCNSObjectType(QualType Ty) const; 390 391 //===--------------------------------------------------------------------===// 392 // Type Sizing and Analysis 393 //===--------------------------------------------------------------------===// 394 395 /// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 396 /// scalar floating point type. 397 const llvm::fltSemantics &getFloatTypeSemantics(QualType T) const; 398 399 /// getTypeInfo - Get the size and alignment of the specified complete type in 400 /// bits. 401 std::pair<uint64_t, unsigned> getTypeInfo(const Type *T); 402 std::pair<uint64_t, unsigned> getTypeInfo(QualType T) { 403 return getTypeInfo(T.getTypePtr()); 404 } 405 406 /// getTypeSize - Return the size of the specified type, in bits. This method 407 /// does not work on incomplete types. 408 uint64_t getTypeSize(QualType T) { 409 return getTypeInfo(T).first; 410 } 411 uint64_t getTypeSize(const Type *T) { 412 return getTypeInfo(T).first; 413 } 414 415 /// getTypeAlign - Return the ABI-specified alignment of a type, in bits. 416 /// This method does not work on incomplete types. 417 unsigned getTypeAlign(QualType T) { 418 return getTypeInfo(T).second; 419 } 420 unsigned getTypeAlign(const Type *T) { 421 return getTypeInfo(T).second; 422 } 423 424 /// getPreferredTypeAlign - Return the "preferred" alignment of the specified 425 /// type for the current target in bits. This can be different than the ABI 426 /// alignment in cases where it is beneficial for performance to overalign 427 /// a data type. 428 unsigned getPreferredTypeAlign(const Type *T); 429 430 /// getDeclAlign - Return the alignment of the specified decl that should be 431 /// returned by __alignof(). Note that bitfields do not have a valid 432 /// alignment, so this method will assert on them. 433 unsigned getDeclAlign(const Decl *D); 434 435 /// getASTRecordLayout - Get or compute information about the layout of the 436 /// specified record (struct/union/class), which indicates its size and field 437 /// position information. 438 const ASTRecordLayout &getASTRecordLayout(const RecordDecl *D); 439 440 const ASTRecordLayout &getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D); 441 const RecordDecl *addRecordToClass(const ObjCInterfaceDecl *D); 442 const FieldDecl *getFieldDecl(const ObjCIvarRefExpr *MRef) { 443 llvm::DenseMap<const ObjCIvarRefExpr *, const FieldDecl*>::iterator I 444 = ASTFieldForIvarRef.find(MRef); 445 assert (I != ASTFieldForIvarRef.end() && "Unable to find field_decl"); 446 return I->second; 447 } 448 void setFieldDecl(const ObjCInterfaceDecl *OI, 449 const ObjCIvarDecl *Ivar, 450 const ObjCIvarRefExpr *MRef); 451 //===--------------------------------------------------------------------===// 452 // Type Operators 453 //===--------------------------------------------------------------------===// 454 455 /// getCanonicalType - Return the canonical (structural) type corresponding to 456 /// the specified potentially non-canonical type. The non-canonical version 457 /// of a type may have many "decorated" versions of types. Decorators can 458 /// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 459 /// to be free of any of these, allowing two canonical types to be compared 460 /// for exact equality with a simple pointer comparison. 461 QualType getCanonicalType(QualType T); 462 const Type *getCanonicalType(const Type *T) { 463 return T->getCanonicalTypeInternal().getTypePtr(); 464 } 465 466 /// \brief Determine whether the given types are equivalent. 467 bool hasSameType(QualType T1, QualType T2) { 468 return getCanonicalType(T1) == getCanonicalType(T2); 469 } 470 471 /// \brief Determine whether the given types are equivalent after 472 /// cvr-qualifiers have been removed. 473 bool hasSameUnqualifiedType(QualType T1, QualType T2) { 474 T1 = getCanonicalType(T1); 475 T2 = getCanonicalType(T2); 476 return T1.getUnqualifiedType() == T2.getUnqualifiedType(); 477 } 478 479 /// \brief Retrieves the "canonical" declaration of the given tag 480 /// declaration. 481 /// 482 /// The canonical declaration for the given tag declaration is 483 /// either the definition of the tag (if it is a complete type) or 484 /// the first declaration of that tag. 485 TagDecl *getCanonicalDecl(TagDecl *Tag) { 486 QualType T = getTagDeclType(Tag); 487 return cast<TagDecl>(cast<TagType>(T)->getDecl()); 488 } 489 490 /// Type Query functions. If the type is an instance of the specified class, 491 /// return the Type pointer for the underlying maximally pretty type. This 492 /// is a member of ASTContext because this may need to do some amount of 493 /// canonicalization, e.g. to move type qualifiers into the element type. 494 const ArrayType *getAsArrayType(QualType T); 495 const ConstantArrayType *getAsConstantArrayType(QualType T) { 496 return dyn_cast_or_null<ConstantArrayType>(getAsArrayType(T)); 497 } 498 const VariableArrayType *getAsVariableArrayType(QualType T) { 499 return dyn_cast_or_null<VariableArrayType>(getAsArrayType(T)); 500 } 501 const IncompleteArrayType *getAsIncompleteArrayType(QualType T) { 502 return dyn_cast_or_null<IncompleteArrayType>(getAsArrayType(T)); 503 } 504 505 /// getBaseElementType - Returns the innermost element type of a variable 506 /// length array type. For example, will return "int" for int[m][n] 507 QualType getBaseElementType(const VariableArrayType *VAT); 508 509 /// getArrayDecayedType - Return the properly qualified result of decaying the 510 /// specified array type to a pointer. This operation is non-trivial when 511 /// handling typedefs etc. The canonical type of "T" must be an array type, 512 /// this returns a pointer to a properly qualified element of the array. 513 /// 514 /// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 515 QualType getArrayDecayedType(QualType T); 516 517 /// getIntegerTypeOrder - Returns the highest ranked integer type: 518 /// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 519 /// LHS < RHS, return -1. 520 int getIntegerTypeOrder(QualType LHS, QualType RHS); 521 522 /// getFloatingTypeOrder - Compare the rank of the two specified floating 523 /// point types, ignoring the domain of the type (i.e. 'double' == 524 /// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 525 /// LHS < RHS, return -1. 526 int getFloatingTypeOrder(QualType LHS, QualType RHS); 527 528 /// getFloatingTypeOfSizeWithinDomain - Returns a real floating 529 /// point or a complex type (based on typeDomain/typeSize). 530 /// 'typeDomain' is a real floating point or complex type. 531 /// 'typeSize' is a real floating point or complex type. 532 QualType getFloatingTypeOfSizeWithinDomain(QualType typeSize, 533 QualType typeDomain) const; 534 535 //===--------------------------------------------------------------------===// 536 // Type Compatibility Predicates 537 //===--------------------------------------------------------------------===// 538 539 /// Compatibility predicates used to check assignment expressions. 540 bool typesAreCompatible(QualType, QualType); // C99 6.2.7p1 541 bool typesAreBlockCompatible(QualType lhs, QualType rhs); 542 543 bool isObjCIdType(QualType T) const { 544 if (!IdStructType) // ObjC isn't enabled 545 return false; 546 return T->getAsStructureType() == IdStructType; 547 } 548 bool isObjCClassType(QualType T) const { 549 if (!ClassStructType) // ObjC isn't enabled 550 return false; 551 return T->getAsStructureType() == ClassStructType; 552 } 553 bool isObjCSelType(QualType T) const { 554 assert(SelStructType && "isObjCSelType used before 'SEL' type is built"); 555 return T->getAsStructureType() == SelStructType; 556 } 557 558 // Check the safety of assignment from LHS to RHS 559 bool canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 560 const ObjCInterfaceType *RHS); 561 562 // Functions for calculating composite types 563 QualType mergeTypes(QualType, QualType); 564 QualType mergeFunctionTypes(QualType, QualType); 565 566 //===--------------------------------------------------------------------===// 567 // Integer Predicates 568 //===--------------------------------------------------------------------===// 569 570 // The width of an integer, as defined in C99 6.2.6.2. This is the number 571 // of bits in an integer type excluding any padding bits. 572 unsigned getIntWidth(QualType T); 573 574 // Per C99 6.2.5p6, for every signed integer type, there is a corresponding 575 // unsigned integer type. This method takes a signed type, and returns the 576 // corresponding unsigned integer type. 577 QualType getCorrespondingUnsignedType(QualType T); 578 579 //===--------------------------------------------------------------------===// 580 // Type Iterators. 581 //===--------------------------------------------------------------------===// 582 583 typedef std::vector<Type*>::iterator type_iterator; 584 typedef std::vector<Type*>::const_iterator const_type_iterator; 585 586 type_iterator types_begin() { return Types.begin(); } 587 type_iterator types_end() { return Types.end(); } 588 const_type_iterator types_begin() const { return Types.begin(); } 589 const_type_iterator types_end() const { return Types.end(); } 590 591 //===--------------------------------------------------------------------===// 592 // Serialization 593 //===--------------------------------------------------------------------===// 594 595 void Emit(llvm::Serializer& S) const; 596 static ASTContext* Create(llvm::Deserializer& D); 597 598private: 599 ASTContext(const ASTContext&); // DO NOT IMPLEMENT 600 void operator=(const ASTContext&); // DO NOT IMPLEMENT 601 602 void InitBuiltinTypes(); 603 void InitBuiltinType(QualType &R, BuiltinType::Kind K); 604 605 // Return the ObjC type encoding for a given type. 606 void getObjCEncodingForTypeImpl(QualType t, std::string &S, 607 bool ExpandPointedToStructures, 608 bool ExpandStructures, 609 FieldDecl *Field, 610 bool OutermostType = false, 611 bool EncodingProperty = false) const; 612 613}; 614 615} // end namespace clang 616 617// operator new and delete aren't allowed inside namespaces. 618// The throw specifications are mandated by the standard. 619/// @brief Placement new for using the ASTContext's allocator. 620/// 621/// This placement form of operator new uses the ASTContext's allocator for 622/// obtaining memory. It is a non-throwing new, which means that it returns 623/// null on error. (If that is what the allocator does. The current does, so if 624/// this ever changes, this operator will have to be changed, too.) 625/// Usage looks like this (assuming there's an ASTContext 'Context' in scope): 626/// @code 627/// // Default alignment (16) 628/// IntegerLiteral *Ex = new (Context) IntegerLiteral(arguments); 629/// // Specific alignment 630/// IntegerLiteral *Ex2 = new (Context, 8) IntegerLiteral(arguments); 631/// @endcode 632/// Please note that you cannot use delete on the pointer; it must be 633/// deallocated using an explicit destructor call followed by 634/// @c Context.Deallocate(Ptr). 635/// 636/// @param Bytes The number of bytes to allocate. Calculated by the compiler. 637/// @param C The ASTContext that provides the allocator. 638/// @param Alignment The alignment of the allocated memory (if the underlying 639/// allocator supports it). 640/// @return The allocated memory. Could be NULL. 641inline void *operator new(size_t Bytes, clang::ASTContext &C, 642 size_t Alignment = 16) throw () { 643 return C.Allocate(Bytes, Alignment); 644} 645/// @brief Placement delete companion to the new above. 646/// 647/// This operator is just a companion to the new above. There is no way of 648/// invoking it directly; see the new operator for more details. This operator 649/// is called implicitly by the compiler if a placement new expression using 650/// the ASTContext throws in the object constructor. 651inline void operator delete(void *Ptr, clang::ASTContext &C) 652 throw () { 653 C.Deallocate(Ptr); 654} 655 656/// This placement form of operator new[] uses the ASTContext's allocator for 657/// obtaining memory. It is a non-throwing new[], which means that it returns 658/// null on error. 659/// Usage looks like this (assuming there's an ASTContext 'Context' in scope): 660/// @code 661/// // Default alignment (16) 662/// char *data = new (Context) char[10]; 663/// // Specific alignment 664/// char *data = new (Context, 8) char[10]; 665/// @endcode 666/// Please note that you cannot use delete on the pointer; it must be 667/// deallocated using an explicit destructor call followed by 668/// @c Context.Deallocate(Ptr). 669/// 670/// @param Bytes The number of bytes to allocate. Calculated by the compiler. 671/// @param C The ASTContext that provides the allocator. 672/// @param Alignment The alignment of the allocated memory (if the underlying 673/// allocator supports it). 674/// @return The allocated memory. Could be NULL. 675inline void *operator new[](size_t Bytes, clang::ASTContext& C, 676 size_t Alignment = 16) throw () { 677 return C.Allocate(Bytes, Alignment); 678} 679 680/// @brief Placement delete[] companion to the new[] above. 681/// 682/// This operator is just a companion to the new[] above. There is no way of 683/// invoking it directly; see the new[] operator for more details. This operator 684/// is called implicitly by the compiler if a placement new[] expression using 685/// the ASTContext throws in the object constructor. 686inline void operator delete[](void *Ptr, clang::ASTContext &C) throw () { 687 C.Deallocate(Ptr); 688} 689 690#endif 691