ASTContext.h revision 3e9704981d7691fdd44913bf1786e8d760d8a627
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<ObjCQualifiedInterfaceType> ObjCQualifiedInterfaceTypes; 72 llvm::FoldingSet<ObjCQualifiedIdType> ObjCQualifiedIdTypes; 73 /// ASTRecordLayouts - A cache mapping from RecordDecls to ASTRecordLayouts. 74 /// This is lazily created. This is intentionally not serialized. 75 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*> ASTRecordLayouts; 76 llvm::DenseMap<const ObjCInterfaceDecl*, 77 const ASTRecordLayout*> ASTObjCInterfaces; 78 79 // FIXME: Shouldn't ASTRecordForInterface/ASTFieldForIvarRef and 80 // addRecordToClass/getFieldDecl be part of the backend (i.e. CodeGenTypes and 81 // CodeGenFunction)? 82 llvm::DenseMap<const ObjCInterfaceDecl*, 83 const RecordDecl*> ASTRecordForInterface; 84 llvm::DenseMap<const ObjCIvarRefExpr*, const FieldDecl*> ASTFieldForIvarRef; 85 86 /// BuiltinVaListType - built-in va list type. 87 /// This is initially null and set by Sema::LazilyCreateBuiltin when 88 /// a builtin that takes a valist is encountered. 89 QualType BuiltinVaListType; 90 91 /// ObjCIdType - a pseudo built-in typedef type (set by Sema). 92 QualType ObjCIdType; 93 const RecordType *IdStructType; 94 95 /// ObjCSelType - another pseudo built-in typedef type (set by Sema). 96 QualType ObjCSelType; 97 const RecordType *SelStructType; 98 99 /// ObjCProtoType - another pseudo built-in typedef type (set by Sema). 100 QualType ObjCProtoType; 101 const RecordType *ProtoStructType; 102 103 /// ObjCClassType - another pseudo built-in typedef type (set by Sema). 104 QualType ObjCClassType; 105 const RecordType *ClassStructType; 106 107 QualType ObjCConstantStringType; 108 RecordDecl *CFConstantStringTypeDecl; 109 110 RecordDecl *ObjCFastEnumerationStateTypeDecl; 111 112 TranslationUnitDecl *TUDecl; 113 114 /// SourceMgr - The associated SourceManager object. 115 SourceManager &SourceMgr; 116 117 /// LangOpts - The language options used to create the AST associated with 118 /// this ASTContext object. 119 LangOptions LangOpts; 120 121 /// Allocator - The allocator object used to create AST objects. 122 llvm::MallocAllocator Allocator; 123 124public: 125 TargetInfo &Target; 126 IdentifierTable &Idents; 127 SelectorTable &Selectors; 128 DeclarationNameTable DeclarationNames; 129 130 SourceManager& getSourceManager() { return SourceMgr; } 131 llvm::MallocAllocator &getAllocator() { return Allocator; } 132 void Deallocate(void *Ptr) { Allocator.Deallocate(Ptr); } 133 134 const LangOptions& getLangOptions() const { return LangOpts; } 135 136 FullSourceLoc getFullLoc(SourceLocation Loc) const { 137 return FullSourceLoc(Loc,SourceMgr); 138 } 139 140 TranslationUnitDecl *getTranslationUnitDecl() const { return TUDecl; } 141 142 /// This is intentionally not serialized. It is populated by the 143 /// ASTContext ctor, and there are no external pointers/references to 144 /// internal variables of BuiltinInfo. 145 Builtin::Context BuiltinInfo; 146 147 // Builtin Types. 148 QualType VoidTy; 149 QualType BoolTy; 150 QualType CharTy; 151 QualType WCharTy; // [C++ 3.9.1p5] 152 QualType SignedCharTy, ShortTy, IntTy, LongTy, LongLongTy; 153 QualType UnsignedCharTy, UnsignedShortTy, UnsignedIntTy, UnsignedLongTy; 154 QualType UnsignedLongLongTy; 155 QualType FloatTy, DoubleTy, LongDoubleTy; 156 QualType FloatComplexTy, DoubleComplexTy, LongDoubleComplexTy; 157 QualType VoidPtrTy; 158 QualType OverloadTy; 159 QualType DependentTy; 160 161 ASTContext(const LangOptions& LOpts, SourceManager &SM, TargetInfo &t, 162 IdentifierTable &idents, SelectorTable &sels, 163 unsigned size_reserve=0); 164 165 ~ASTContext(); 166 167 void PrintStats() const; 168 const std::vector<Type*>& getTypes() const { return Types; } 169 170 //===--------------------------------------------------------------------===// 171 // Type Constructors 172 //===--------------------------------------------------------------------===// 173 174 /// getASQualType - Return the uniqued reference to the type for an address 175 /// space qualified type with the specified type and address space. The 176 /// resulting type has a union of the qualifiers from T and the address space. 177 // If T already has an address space specifier, it is silently replaced. 178 QualType getASQualType(QualType T, unsigned AddressSpace); 179 180 /// getComplexType - Return the uniqued reference to the type for a complex 181 /// number with the specified element type. 182 QualType getComplexType(QualType T); 183 184 /// getPointerType - Return the uniqued reference to the type for a pointer to 185 /// the specified type. 186 QualType getPointerType(QualType T); 187 188 /// getBlockPointerType - Return the uniqued reference to the type for a block 189 /// of the specified type. 190 QualType getBlockPointerType(QualType T); 191 192 /// getReferenceType - Return the uniqued reference to the type for a 193 /// reference to the specified type. 194 QualType getReferenceType(QualType T); 195 196 /// getMemberPointerType - Return the uniqued reference to the type for a 197 /// member pointer to the specified type in the specified class. The class 198 /// is a Type because it could be a dependent name. 199 QualType getMemberPointerType(QualType T, const Type *Cls); 200 201 /// getVariableArrayType - Returns a non-unique reference to the type for a 202 /// variable array of the specified element type. 203 QualType getVariableArrayType(QualType EltTy, Expr *NumElts, 204 ArrayType::ArraySizeModifier ASM, 205 unsigned EltTypeQuals); 206 207 /// getDependentSizedArrayType - Returns a non-unique reference to 208 /// the type for a dependently-sized array of the specified element 209 /// type. FIXME: We will need these to be uniqued, or at least 210 /// comparable, at some point. 211 QualType getDependentSizedArrayType(QualType EltTy, Expr *NumElts, 212 ArrayType::ArraySizeModifier ASM, 213 unsigned EltTypeQuals); 214 215 /// getIncompleteArrayType - Returns a unique reference to the type for a 216 /// incomplete array of the specified element type. 217 QualType getIncompleteArrayType(QualType EltTy, 218 ArrayType::ArraySizeModifier ASM, 219 unsigned EltTypeQuals); 220 221 /// getConstantArrayType - Return the unique reference to the type for a 222 /// constant array of the specified element type. 223 QualType getConstantArrayType(QualType EltTy, const llvm::APInt &ArySize, 224 ArrayType::ArraySizeModifier ASM, 225 unsigned EltTypeQuals); 226 227 /// getVectorType - Return the unique reference to a vector type of 228 /// the specified element type and size. VectorType must be a built-in type. 229 QualType getVectorType(QualType VectorType, unsigned NumElts); 230 231 /// getExtVectorType - Return the unique reference to an extended vector type 232 /// of the specified element type and size. VectorType must be a built-in 233 /// type. 234 QualType getExtVectorType(QualType VectorType, unsigned NumElts); 235 236 /// getFunctionTypeNoProto - Return a K&R style C function type like 'int()'. 237 /// 238 QualType getFunctionTypeNoProto(QualType ResultTy); 239 240 /// getFunctionType - Return a normal function type with a typed argument 241 /// list. isVariadic indicates whether the argument list includes '...'. 242 QualType getFunctionType(QualType ResultTy, const QualType *ArgArray, 243 unsigned NumArgs, bool isVariadic, 244 unsigned TypeQuals); 245 246 /// getTypeDeclType - Return the unique reference to the type for 247 /// the specified type declaration. 248 QualType getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl=0); 249 250 /// getTypedefType - Return the unique reference to the type for the 251 /// specified typename decl. 252 QualType getTypedefType(TypedefDecl *Decl); 253 QualType getTemplateTypeParmType(TemplateTypeParmDecl *Decl); 254 QualType getObjCInterfaceType(ObjCInterfaceDecl *Decl); 255 256 /// getObjCQualifiedInterfaceType - Return a 257 /// ObjCQualifiedInterfaceType type for the given interface decl and 258 /// the conforming protocol list. 259 QualType getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 260 ObjCProtocolDecl **ProtocolList, unsigned NumProtocols); 261 262 /// getObjCQualifiedIdType - Return an ObjCQualifiedIdType for a 263 /// given 'id' and conforming protocol list. 264 QualType getObjCQualifiedIdType(ObjCProtocolDecl **ProtocolList, 265 unsigned NumProtocols); 266 267 268 /// getTypeOfType - GCC extension. 269 QualType getTypeOfExpr(Expr *e); 270 QualType getTypeOfType(QualType t); 271 272 /// getTagDeclType - Return the unique reference to the type for the 273 /// specified TagDecl (struct/union/class/enum) decl. 274 QualType getTagDeclType(TagDecl *Decl); 275 276 /// getSizeType - Return the unique type for "size_t" (C99 7.17), defined 277 /// in <stddef.h>. The sizeof operator requires this (C99 6.5.3.4p4). 278 QualType getSizeType() const; 279 280 /// getWCharType - Return the unique type for "wchar_t" (C99 7.17), defined 281 /// in <stddef.h>. Wide strings require this (C99 6.4.5p5). 282 QualType getWCharType() const; 283 284 /// getSignedWCharType - Return the type of "signed wchar_t". 285 /// Used when in C++, as a GCC extension. 286 QualType getSignedWCharType() const; 287 288 /// getUnsignedWCharType - Return the type of "unsigned wchar_t". 289 /// Used when in C++, as a GCC extension. 290 QualType getUnsignedWCharType() const; 291 292 /// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 293 /// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 294 QualType getPointerDiffType() const; 295 296 // getCFConstantStringType - Return the C structure type used to represent 297 // constant CFStrings. 298 QualType getCFConstantStringType(); 299 300 // This setter/getter represents the ObjC type for an NSConstantString. 301 void setObjCConstantStringInterface(ObjCInterfaceDecl *Decl); 302 QualType getObjCConstantStringInterface() const { 303 return ObjCConstantStringType; 304 } 305 306 //// This gets the struct used to keep track of fast enumerations. 307 QualType getObjCFastEnumerationStateType(); 308 309 /// getObjCEncodingForType - Emit the ObjC type encoding for the 310 /// given type into \arg S. If \arg NameFields is specified then 311 /// record field names are also encoded. 312 void getObjCEncodingForType(QualType t, std::string &S, 313 FieldDecl *Field=NULL) const; 314 315 void getLegacyIntegralTypeEncoding(QualType &t) const; 316 317 // Put the string version of type qualifiers into S. 318 void getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 319 std::string &S) const; 320 321 /// getObjCEncodingForMethodDecl - Return the encoded type for this method 322 /// declaration. 323 void getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, std::string &S); 324 325 /// getObjCEncodingForPropertyDecl - Return the encoded type for 326 /// this method declaration. If non-NULL, Container must be either 327 /// an ObjCCategoryImplDecl or ObjCImplementationDecl; it should 328 /// only be NULL when getting encodings for protocol properties. 329 void getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 330 const Decl *Container, 331 std::string &S); 332 333 /// getObjCEncodingTypeSize returns size of type for objective-c encoding 334 /// purpose. 335 int getObjCEncodingTypeSize(QualType t); 336 337 /// This setter/getter represents the ObjC 'id' type. It is setup lazily, by 338 /// Sema. id is always a (typedef for a) pointer type, a pointer to a struct. 339 QualType getObjCIdType() const { return ObjCIdType; } 340 void setObjCIdType(TypedefDecl *Decl); 341 342 void setObjCSelType(TypedefDecl *Decl); 343 QualType getObjCSelType() const { return ObjCSelType; } 344 345 void setObjCProtoType(QualType QT); 346 QualType getObjCProtoType() const { return ObjCProtoType; } 347 348 /// This setter/getter repreents the ObjC 'Class' type. It is setup lazily, by 349 /// Sema. 'Class' is always a (typedef for a) pointer type, a pointer to a 350 /// struct. 351 QualType getObjCClassType() const { return ObjCClassType; } 352 void setObjCClassType(TypedefDecl *Decl); 353 354 void setBuiltinVaListType(QualType T); 355 QualType getBuiltinVaListType() const { return BuiltinVaListType; } 356 357private: 358 QualType getFromTargetType(unsigned Type) const; 359 360 //===--------------------------------------------------------------------===// 361 // Type Predicates. 362 //===--------------------------------------------------------------------===// 363 364public: 365 /// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 366 /// to an object type. This includes "id" and "Class" (two 'special' pointers 367 /// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 368 /// ID type). 369 bool isObjCObjectPointerType(QualType Ty) const; 370 371 /// isObjCNSObjectType - Return true if this is an NSObject object with 372 /// its NSObject attribute set. 373 bool isObjCNSObjectType(QualType Ty) const; 374 375 //===--------------------------------------------------------------------===// 376 // Type Sizing and Analysis 377 //===--------------------------------------------------------------------===// 378 379 /// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 380 /// scalar floating point type. 381 const llvm::fltSemantics &getFloatTypeSemantics(QualType T) const; 382 383 /// getTypeInfo - Get the size and alignment of the specified complete type in 384 /// bits. 385 std::pair<uint64_t, unsigned> getTypeInfo(const Type *T); 386 std::pair<uint64_t, unsigned> getTypeInfo(QualType T) { 387 return getTypeInfo(T.getTypePtr()); 388 } 389 390 /// getTypeSize - Return the size of the specified type, in bits. This method 391 /// does not work on incomplete types. 392 uint64_t getTypeSize(QualType T) { 393 return getTypeInfo(T).first; 394 } 395 uint64_t getTypeSize(const Type *T) { 396 return getTypeInfo(T).first; 397 } 398 399 /// getTypeAlign - Return the ABI-specified alignment of a type, in bits. 400 /// This method does not work on incomplete types. 401 unsigned getTypeAlign(QualType T) { 402 return getTypeInfo(T).second; 403 } 404 unsigned getTypeAlign(const Type *T) { 405 return getTypeInfo(T).second; 406 } 407 408 /// getPreferredTypeAlign - Return the "preferred" alignment of the specified 409 /// type for the current target in bits. This can be different than the ABI 410 /// alignment in cases where it is beneficial for performance to overalign 411 /// a data type. 412 unsigned getPreferredTypeAlign(const Type *T); 413 414 /// getDeclAlign - Return the alignment of the specified decl that should be 415 /// returned by __alignof(). Note that bitfields do not have a valid 416 /// alignment, so this method will assert on them. 417 unsigned getDeclAlign(const Decl *D); 418 419 /// getASTRecordLayout - Get or compute information about the layout of the 420 /// specified record (struct/union/class), which indicates its size and field 421 /// position information. 422 const ASTRecordLayout &getASTRecordLayout(const RecordDecl *D); 423 424 const ASTRecordLayout &getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D); 425 const RecordDecl *addRecordToClass(const ObjCInterfaceDecl *D); 426 const FieldDecl *getFieldDecl(const ObjCIvarRefExpr *MRef) { 427 llvm::DenseMap<const ObjCIvarRefExpr *, const FieldDecl*>::iterator I 428 = ASTFieldForIvarRef.find(MRef); 429 assert (I != ASTFieldForIvarRef.end() && "Unable to find field_decl"); 430 return I->second; 431 } 432 void setFieldDecl(const ObjCInterfaceDecl *OI, 433 const ObjCIvarDecl *Ivar, 434 const ObjCIvarRefExpr *MRef); 435 //===--------------------------------------------------------------------===// 436 // Type Operators 437 //===--------------------------------------------------------------------===// 438 439 /// getCanonicalType - Return the canonical (structural) type corresponding to 440 /// the specified potentially non-canonical type. The non-canonical version 441 /// of a type may have many "decorated" versions of types. Decorators can 442 /// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 443 /// to be free of any of these, allowing two canonical types to be compared 444 /// for exact equality with a simple pointer comparison. 445 QualType getCanonicalType(QualType T); 446 const Type *getCanonicalType(const Type *T) { 447 return T->getCanonicalTypeInternal().getTypePtr(); 448 } 449 450 /// Type Query functions. If the type is an instance of the specified class, 451 /// return the Type pointer for the underlying maximally pretty type. This 452 /// is a member of ASTContext because this may need to do some amount of 453 /// canonicalization, e.g. to move type qualifiers into the element type. 454 const ArrayType *getAsArrayType(QualType T); 455 const ConstantArrayType *getAsConstantArrayType(QualType T) { 456 return dyn_cast_or_null<ConstantArrayType>(getAsArrayType(T)); 457 } 458 const VariableArrayType *getAsVariableArrayType(QualType T) { 459 return dyn_cast_or_null<VariableArrayType>(getAsArrayType(T)); 460 } 461 const IncompleteArrayType *getAsIncompleteArrayType(QualType T) { 462 return dyn_cast_or_null<IncompleteArrayType>(getAsArrayType(T)); 463 } 464 465 /// getBaseElementType - Returns the innermost element type of a variable 466 /// length array type. For example, will return "int" for int[m][n] 467 QualType getBaseElementType(const VariableArrayType *VAT); 468 469 /// getArrayDecayedType - Return the properly qualified result of decaying the 470 /// specified array type to a pointer. This operation is non-trivial when 471 /// handling typedefs etc. The canonical type of "T" must be an array type, 472 /// this returns a pointer to a properly qualified element of the array. 473 /// 474 /// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 475 QualType getArrayDecayedType(QualType T); 476 477 /// getIntegerTypeOrder - Returns the highest ranked integer type: 478 /// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 479 /// LHS < RHS, return -1. 480 int getIntegerTypeOrder(QualType LHS, QualType RHS); 481 482 /// getFloatingTypeOrder - Compare the rank of the two specified floating 483 /// point types, ignoring the domain of the type (i.e. 'double' == 484 /// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 485 /// LHS < RHS, return -1. 486 int getFloatingTypeOrder(QualType LHS, QualType RHS); 487 488 /// getFloatingTypeOfSizeWithinDomain - Returns a real floating 489 /// point or a complex type (based on typeDomain/typeSize). 490 /// 'typeDomain' is a real floating point or complex type. 491 /// 'typeSize' is a real floating point or complex type. 492 QualType getFloatingTypeOfSizeWithinDomain(QualType typeSize, 493 QualType typeDomain) const; 494 495 //===--------------------------------------------------------------------===// 496 // Type Compatibility Predicates 497 //===--------------------------------------------------------------------===// 498 499 /// Compatibility predicates used to check assignment expressions. 500 bool typesAreCompatible(QualType, QualType); // C99 6.2.7p1 501 bool typesAreBlockCompatible(QualType lhs, QualType rhs); 502 503 bool isObjCIdType(QualType T) const { 504 if (!IdStructType) // ObjC isn't enabled 505 return false; 506 return T->getAsStructureType() == IdStructType; 507 } 508 bool isObjCClassType(QualType T) const { 509 if (!ClassStructType) // ObjC isn't enabled 510 return false; 511 return T->getAsStructureType() == ClassStructType; 512 } 513 bool isObjCSelType(QualType T) const { 514 assert(SelStructType && "isObjCSelType used before 'SEL' type is built"); 515 return T->getAsStructureType() == SelStructType; 516 } 517 518 // Check the safety of assignment from LHS to RHS 519 bool canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 520 const ObjCInterfaceType *RHS); 521 522 // Functions for calculating composite types 523 QualType mergeTypes(QualType, QualType); 524 QualType mergeFunctionTypes(QualType, QualType); 525 526 //===--------------------------------------------------------------------===// 527 // Integer Predicates 528 //===--------------------------------------------------------------------===// 529 530 // The width of an integer, as defined in C99 6.2.6.2. This is the number 531 // of bits in an integer type excluding any padding bits. 532 unsigned getIntWidth(QualType T); 533 534 // Per C99 6.2.5p6, for every signed integer type, there is a corresponding 535 // unsigned integer type. This method takes a signed type, and returns the 536 // corresponding unsigned integer type. 537 QualType getCorrespondingUnsignedType(QualType T); 538 539 //===--------------------------------------------------------------------===// 540 // Type Iterators. 541 //===--------------------------------------------------------------------===// 542 543 typedef std::vector<Type*>::iterator type_iterator; 544 typedef std::vector<Type*>::const_iterator const_type_iterator; 545 546 type_iterator types_begin() { return Types.begin(); } 547 type_iterator types_end() { return Types.end(); } 548 const_type_iterator types_begin() const { return Types.begin(); } 549 const_type_iterator types_end() const { return Types.end(); } 550 551 //===--------------------------------------------------------------------===// 552 // Serialization 553 //===--------------------------------------------------------------------===// 554 555 void Emit(llvm::Serializer& S) const; 556 static ASTContext* Create(llvm::Deserializer& D); 557 558private: 559 ASTContext(const ASTContext&); // DO NOT IMPLEMENT 560 void operator=(const ASTContext&); // DO NOT IMPLEMENT 561 562 void InitBuiltinTypes(); 563 void InitBuiltinType(QualType &R, BuiltinType::Kind K); 564 565 // Return the ObjC type encoding for a given type. 566 void getObjCEncodingForTypeImpl(QualType t, std::string &S, 567 bool ExpandPointedToStructures, 568 bool ExpandStructures, 569 FieldDecl *Field, 570 bool OutermostType = false, 571 bool EncodingProperty = false) const; 572 573}; 574 575} // end namespace clang 576 577// operator new and delete aren't allowed inside namespaces. 578// The throw specifications are mandated by the standard. 579/// @brief Placement new for using the ASTContext's allocator. 580/// 581/// This placement form of operator new uses the ASTContext's allocator for 582/// obtaining memory. It is a non-throwing new, which means that it returns 583/// null on error. (If that is what the allocator does. The current does, so if 584/// this ever changes, this operator will have to be changed, too.) 585/// Usage looks like this (assuming there's an ASTContext 'Context' in scope): 586/// @code 587/// // Default alignment (16) 588/// IntegerLiteral *Ex = new (Context) IntegerLiteral(arguments); 589/// // Specific alignment 590/// IntegerLiteral *Ex2 = new (Context, 8) IntegerLiteral(arguments); 591/// @endcode 592/// Please note that you cannot use delete on the pointer; it must be 593/// deallocated using an explicit destructor call followed by 594/// @c Context.getAllocator().Deallocate(Ptr) 595/// 596/// @param Bytes The number of bytes to allocate. Calculated by the compiler. 597/// @param C The ASTContext that provides the allocator. 598/// @param Alignment The alignment of the allocated memory (if the allocator 599/// supports it, which the current one doesn't). 600/// @return The allocated memory. Could be NULL. 601inline void *operator new(size_t Bytes, clang::ASTContext &C, 602 size_t Alignment = 16) throw () { 603 return C.getAllocator().Allocate(Bytes, Alignment); 604} 605/// @brief Placement delete companion to the new above. 606/// 607/// This operator is just a companion to the new above. There is no way of 608/// invoking it directly; see the new operator for more details. This operator 609/// is called implicitly by the compiler if a placement new expression using 610/// the ASTContext throws in the object constructor. 611inline void operator delete(void *Ptr, clang::ASTContext &C) 612 throw () { 613 C.getAllocator().Deallocate(Ptr); 614} 615 616#endif 617