ASTContext.h revision c0ac4923f08b25ae973a8ee7942cf3eb89da57b7
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 /// MallocAlloc/BumpAlloc - The allocator objects used to create AST objects. 122 bool FreeMemory; 123 llvm::MallocAllocator MallocAlloc; 124 llvm::BumpPtrAllocator BumpAlloc; 125public: 126 TargetInfo &Target; 127 IdentifierTable &Idents; 128 SelectorTable &Selectors; 129 DeclarationNameTable DeclarationNames; 130 131 SourceManager& getSourceManager() { return SourceMgr; } 132 void *Allocate(unsigned Size, unsigned Align = 8) { 133 return FreeMemory ? MallocAlloc.Allocate(Size, Align) : 134 BumpAlloc.Allocate(Size, Align); 135 } 136 void Deallocate(void *Ptr) { 137 if (FreeMemory) 138 MallocAlloc.Deallocate(Ptr); 139 } 140 const LangOptions& getLangOptions() const { return LangOpts; } 141 142 FullSourceLoc getFullLoc(SourceLocation Loc) const { 143 return FullSourceLoc(Loc,SourceMgr); 144 } 145 146 TranslationUnitDecl *getTranslationUnitDecl() const { return TUDecl; } 147 148 /// This is intentionally not serialized. It is populated by the 149 /// ASTContext ctor, and there are no external pointers/references to 150 /// internal variables of BuiltinInfo. 151 Builtin::Context BuiltinInfo; 152 153 // Builtin Types. 154 QualType VoidTy; 155 QualType BoolTy; 156 QualType CharTy; 157 QualType WCharTy; // [C++ 3.9.1p5] 158 QualType SignedCharTy, ShortTy, IntTy, LongTy, LongLongTy; 159 QualType UnsignedCharTy, UnsignedShortTy, UnsignedIntTy, UnsignedLongTy; 160 QualType UnsignedLongLongTy; 161 QualType FloatTy, DoubleTy, LongDoubleTy; 162 QualType FloatComplexTy, DoubleComplexTy, LongDoubleComplexTy; 163 QualType VoidPtrTy; 164 QualType OverloadTy; 165 QualType DependentTy; 166 167 ASTContext(const LangOptions& LOpts, SourceManager &SM, TargetInfo &t, 168 IdentifierTable &idents, SelectorTable &sels, 169 bool FreeMemory = true, unsigned size_reserve=0); 170 171 ~ASTContext(); 172 173 void PrintStats() const; 174 const std::vector<Type*>& getTypes() const { return Types; } 175 176 //===--------------------------------------------------------------------===// 177 // Type Constructors 178 //===--------------------------------------------------------------------===// 179 180 /// getASQualType - Return the uniqued reference to the type for an address 181 /// space qualified type with the specified type and address space. The 182 /// resulting type has a union of the qualifiers from T and the address space. 183 // If T already has an address space specifier, it is silently replaced. 184 QualType getASQualType(QualType T, unsigned AddressSpace); 185 186 /// getComplexType - Return the uniqued reference to the type for a complex 187 /// number with the specified element type. 188 QualType getComplexType(QualType T); 189 190 /// getPointerType - Return the uniqued reference to the type for a pointer to 191 /// the specified type. 192 QualType getPointerType(QualType T); 193 194 /// getBlockPointerType - Return the uniqued reference to the type for a block 195 /// of the specified type. 196 QualType getBlockPointerType(QualType T); 197 198 /// getReferenceType - Return the uniqued reference to the type for a 199 /// reference to the specified type. 200 QualType getReferenceType(QualType T); 201 202 /// getMemberPointerType - Return the uniqued reference to the type for a 203 /// member pointer to the specified type in the specified class. The class 204 /// is a Type because it could be a dependent name. 205 QualType getMemberPointerType(QualType T, const Type *Cls); 206 207 /// getVariableArrayType - Returns a non-unique reference to the type for a 208 /// variable array of the specified element type. 209 QualType getVariableArrayType(QualType EltTy, Expr *NumElts, 210 ArrayType::ArraySizeModifier ASM, 211 unsigned EltTypeQuals); 212 213 /// getDependentSizedArrayType - Returns a non-unique reference to 214 /// the type for a dependently-sized array of the specified element 215 /// type. FIXME: We will need these to be uniqued, or at least 216 /// comparable, at some point. 217 QualType getDependentSizedArrayType(QualType EltTy, Expr *NumElts, 218 ArrayType::ArraySizeModifier ASM, 219 unsigned EltTypeQuals); 220 221 /// getIncompleteArrayType - Returns a unique reference to the type for a 222 /// incomplete array of the specified element type. 223 QualType getIncompleteArrayType(QualType EltTy, 224 ArrayType::ArraySizeModifier ASM, 225 unsigned EltTypeQuals); 226 227 /// getConstantArrayType - Return the unique reference to the type for a 228 /// constant array of the specified element type. 229 QualType getConstantArrayType(QualType EltTy, const llvm::APInt &ArySize, 230 ArrayType::ArraySizeModifier ASM, 231 unsigned EltTypeQuals); 232 233 /// getVectorType - Return the unique reference to a vector type of 234 /// the specified element type and size. VectorType must be a built-in type. 235 QualType getVectorType(QualType VectorType, unsigned NumElts); 236 237 /// getExtVectorType - Return the unique reference to an extended vector type 238 /// of the specified element type and size. VectorType must be a built-in 239 /// type. 240 QualType getExtVectorType(QualType VectorType, unsigned NumElts); 241 242 /// getFunctionTypeNoProto - Return a K&R style C function type like 'int()'. 243 /// 244 QualType getFunctionTypeNoProto(QualType ResultTy); 245 246 /// getFunctionType - Return a normal function type with a typed argument 247 /// list. isVariadic indicates whether the argument list includes '...'. 248 QualType getFunctionType(QualType ResultTy, const QualType *ArgArray, 249 unsigned NumArgs, bool isVariadic, 250 unsigned TypeQuals); 251 252 /// getTypeDeclType - Return the unique reference to the type for 253 /// the specified type declaration. 254 QualType getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl=0); 255 256 /// getTypedefType - Return the unique reference to the type for the 257 /// specified typename decl. 258 QualType getTypedefType(TypedefDecl *Decl); 259 QualType getTemplateTypeParmType(TemplateTypeParmDecl *Decl); 260 QualType getObjCInterfaceType(ObjCInterfaceDecl *Decl); 261 262 /// getObjCQualifiedInterfaceType - Return a 263 /// ObjCQualifiedInterfaceType type for the given interface decl and 264 /// the conforming protocol list. 265 QualType getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 266 ObjCProtocolDecl **ProtocolList, unsigned NumProtocols); 267 268 /// getObjCQualifiedIdType - Return an ObjCQualifiedIdType for a 269 /// given 'id' and conforming protocol list. 270 QualType getObjCQualifiedIdType(ObjCProtocolDecl **ProtocolList, 271 unsigned NumProtocols); 272 273 274 /// getTypeOfType - GCC extension. 275 QualType getTypeOfExpr(Expr *e); 276 QualType getTypeOfType(QualType t); 277 278 /// getTagDeclType - Return the unique reference to the type for the 279 /// specified TagDecl (struct/union/class/enum) decl. 280 QualType getTagDeclType(TagDecl *Decl); 281 282 /// getSizeType - Return the unique type for "size_t" (C99 7.17), defined 283 /// in <stddef.h>. The sizeof operator requires this (C99 6.5.3.4p4). 284 QualType getSizeType() const; 285 286 /// getWCharType - Return the unique type for "wchar_t" (C99 7.17), defined 287 /// in <stddef.h>. Wide strings require this (C99 6.4.5p5). 288 QualType getWCharType() const; 289 290 /// getSignedWCharType - Return the type of "signed wchar_t". 291 /// Used when in C++, as a GCC extension. 292 QualType getSignedWCharType() const; 293 294 /// getUnsignedWCharType - Return the type of "unsigned wchar_t". 295 /// Used when in C++, as a GCC extension. 296 QualType getUnsignedWCharType() const; 297 298 /// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 299 /// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 300 QualType getPointerDiffType() const; 301 302 // getCFConstantStringType - Return the C structure type used to represent 303 // constant CFStrings. 304 QualType getCFConstantStringType(); 305 306 // This setter/getter represents the ObjC type for an NSConstantString. 307 void setObjCConstantStringInterface(ObjCInterfaceDecl *Decl); 308 QualType getObjCConstantStringInterface() const { 309 return ObjCConstantStringType; 310 } 311 312 //// This gets the struct used to keep track of fast enumerations. 313 QualType getObjCFastEnumerationStateType(); 314 315 /// getObjCEncodingForType - Emit the ObjC type encoding for the 316 /// given type into \arg S. If \arg NameFields is specified then 317 /// record field names are also encoded. 318 void getObjCEncodingForType(QualType t, std::string &S, 319 FieldDecl *Field=NULL) const; 320 321 void getLegacyIntegralTypeEncoding(QualType &t) const; 322 323 // Put the string version of type qualifiers into S. 324 void getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 325 std::string &S) const; 326 327 /// getObjCEncodingForMethodDecl - Return the encoded type for this method 328 /// declaration. 329 void getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, std::string &S); 330 331 /// getObjCEncodingForPropertyDecl - Return the encoded type for 332 /// this method declaration. If non-NULL, Container must be either 333 /// an ObjCCategoryImplDecl or ObjCImplementationDecl; it should 334 /// only be NULL when getting encodings for protocol properties. 335 void getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 336 const Decl *Container, 337 std::string &S); 338 339 /// getObjCEncodingTypeSize returns size of type for objective-c encoding 340 /// purpose. 341 int getObjCEncodingTypeSize(QualType t); 342 343 /// This setter/getter represents the ObjC 'id' type. It is setup lazily, by 344 /// Sema. id is always a (typedef for a) pointer type, a pointer to a struct. 345 QualType getObjCIdType() const { return ObjCIdType; } 346 void setObjCIdType(TypedefDecl *Decl); 347 348 void setObjCSelType(TypedefDecl *Decl); 349 QualType getObjCSelType() const { return ObjCSelType; } 350 351 void setObjCProtoType(QualType QT); 352 QualType getObjCProtoType() const { return ObjCProtoType; } 353 354 /// This setter/getter repreents the ObjC 'Class' type. It is setup lazily, by 355 /// Sema. 'Class' is always a (typedef for a) pointer type, a pointer to a 356 /// struct. 357 QualType getObjCClassType() const { return ObjCClassType; } 358 void setObjCClassType(TypedefDecl *Decl); 359 360 void setBuiltinVaListType(QualType T); 361 QualType getBuiltinVaListType() const { return BuiltinVaListType; } 362 363private: 364 QualType getFromTargetType(unsigned Type) const; 365 366 //===--------------------------------------------------------------------===// 367 // Type Predicates. 368 //===--------------------------------------------------------------------===// 369 370public: 371 /// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 372 /// to an object type. This includes "id" and "Class" (two 'special' pointers 373 /// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 374 /// ID type). 375 bool isObjCObjectPointerType(QualType Ty) const; 376 377 /// isObjCNSObjectType - Return true if this is an NSObject object with 378 /// its NSObject attribute set. 379 bool isObjCNSObjectType(QualType Ty) const; 380 381 //===--------------------------------------------------------------------===// 382 // Type Sizing and Analysis 383 //===--------------------------------------------------------------------===// 384 385 /// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 386 /// scalar floating point type. 387 const llvm::fltSemantics &getFloatTypeSemantics(QualType T) const; 388 389 /// getTypeInfo - Get the size and alignment of the specified complete type in 390 /// bits. 391 std::pair<uint64_t, unsigned> getTypeInfo(const Type *T); 392 std::pair<uint64_t, unsigned> getTypeInfo(QualType T) { 393 return getTypeInfo(T.getTypePtr()); 394 } 395 396 /// getTypeSize - Return the size of the specified type, in bits. This method 397 /// does not work on incomplete types. 398 uint64_t getTypeSize(QualType T) { 399 return getTypeInfo(T).first; 400 } 401 uint64_t getTypeSize(const Type *T) { 402 return getTypeInfo(T).first; 403 } 404 405 /// getTypeAlign - Return the ABI-specified alignment of a type, in bits. 406 /// This method does not work on incomplete types. 407 unsigned getTypeAlign(QualType T) { 408 return getTypeInfo(T).second; 409 } 410 unsigned getTypeAlign(const Type *T) { 411 return getTypeInfo(T).second; 412 } 413 414 /// getPreferredTypeAlign - Return the "preferred" alignment of the specified 415 /// type for the current target in bits. This can be different than the ABI 416 /// alignment in cases where it is beneficial for performance to overalign 417 /// a data type. 418 unsigned getPreferredTypeAlign(const Type *T); 419 420 /// getDeclAlign - Return the alignment of the specified decl that should be 421 /// returned by __alignof(). Note that bitfields do not have a valid 422 /// alignment, so this method will assert on them. 423 unsigned getDeclAlign(const Decl *D); 424 425 /// getASTRecordLayout - Get or compute information about the layout of the 426 /// specified record (struct/union/class), which indicates its size and field 427 /// position information. 428 const ASTRecordLayout &getASTRecordLayout(const RecordDecl *D); 429 430 const ASTRecordLayout &getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D); 431 const RecordDecl *addRecordToClass(const ObjCInterfaceDecl *D); 432 const FieldDecl *getFieldDecl(const ObjCIvarRefExpr *MRef) { 433 llvm::DenseMap<const ObjCIvarRefExpr *, const FieldDecl*>::iterator I 434 = ASTFieldForIvarRef.find(MRef); 435 assert (I != ASTFieldForIvarRef.end() && "Unable to find field_decl"); 436 return I->second; 437 } 438 void setFieldDecl(const ObjCInterfaceDecl *OI, 439 const ObjCIvarDecl *Ivar, 440 const ObjCIvarRefExpr *MRef); 441 //===--------------------------------------------------------------------===// 442 // Type Operators 443 //===--------------------------------------------------------------------===// 444 445 /// getCanonicalType - Return the canonical (structural) type corresponding to 446 /// the specified potentially non-canonical type. The non-canonical version 447 /// of a type may have many "decorated" versions of types. Decorators can 448 /// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 449 /// to be free of any of these, allowing two canonical types to be compared 450 /// for exact equality with a simple pointer comparison. 451 QualType getCanonicalType(QualType T); 452 const Type *getCanonicalType(const Type *T) { 453 return T->getCanonicalTypeInternal().getTypePtr(); 454 } 455 456 /// Type Query functions. If the type is an instance of the specified class, 457 /// return the Type pointer for the underlying maximally pretty type. This 458 /// is a member of ASTContext because this may need to do some amount of 459 /// canonicalization, e.g. to move type qualifiers into the element type. 460 const ArrayType *getAsArrayType(QualType T); 461 const ConstantArrayType *getAsConstantArrayType(QualType T) { 462 return dyn_cast_or_null<ConstantArrayType>(getAsArrayType(T)); 463 } 464 const VariableArrayType *getAsVariableArrayType(QualType T) { 465 return dyn_cast_or_null<VariableArrayType>(getAsArrayType(T)); 466 } 467 const IncompleteArrayType *getAsIncompleteArrayType(QualType T) { 468 return dyn_cast_or_null<IncompleteArrayType>(getAsArrayType(T)); 469 } 470 471 /// getBaseElementType - Returns the innermost element type of a variable 472 /// length array type. For example, will return "int" for int[m][n] 473 QualType getBaseElementType(const VariableArrayType *VAT); 474 475 /// getArrayDecayedType - Return the properly qualified result of decaying the 476 /// specified array type to a pointer. This operation is non-trivial when 477 /// handling typedefs etc. The canonical type of "T" must be an array type, 478 /// this returns a pointer to a properly qualified element of the array. 479 /// 480 /// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 481 QualType getArrayDecayedType(QualType T); 482 483 /// getIntegerTypeOrder - Returns the highest ranked integer type: 484 /// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 485 /// LHS < RHS, return -1. 486 int getIntegerTypeOrder(QualType LHS, QualType RHS); 487 488 /// getFloatingTypeOrder - Compare the rank of the two specified floating 489 /// point types, ignoring the domain of the type (i.e. 'double' == 490 /// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 491 /// LHS < RHS, return -1. 492 int getFloatingTypeOrder(QualType LHS, QualType RHS); 493 494 /// getFloatingTypeOfSizeWithinDomain - Returns a real floating 495 /// point or a complex type (based on typeDomain/typeSize). 496 /// 'typeDomain' is a real floating point or complex type. 497 /// 'typeSize' is a real floating point or complex type. 498 QualType getFloatingTypeOfSizeWithinDomain(QualType typeSize, 499 QualType typeDomain) const; 500 501 //===--------------------------------------------------------------------===// 502 // Type Compatibility Predicates 503 //===--------------------------------------------------------------------===// 504 505 /// Compatibility predicates used to check assignment expressions. 506 bool typesAreCompatible(QualType, QualType); // C99 6.2.7p1 507 bool typesAreBlockCompatible(QualType lhs, QualType rhs); 508 509 bool isObjCIdType(QualType T) const { 510 if (!IdStructType) // ObjC isn't enabled 511 return false; 512 return T->getAsStructureType() == IdStructType; 513 } 514 bool isObjCClassType(QualType T) const { 515 if (!ClassStructType) // ObjC isn't enabled 516 return false; 517 return T->getAsStructureType() == ClassStructType; 518 } 519 bool isObjCSelType(QualType T) const { 520 assert(SelStructType && "isObjCSelType used before 'SEL' type is built"); 521 return T->getAsStructureType() == SelStructType; 522 } 523 524 // Check the safety of assignment from LHS to RHS 525 bool canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 526 const ObjCInterfaceType *RHS); 527 528 // Functions for calculating composite types 529 QualType mergeTypes(QualType, QualType); 530 QualType mergeFunctionTypes(QualType, QualType); 531 532 //===--------------------------------------------------------------------===// 533 // Integer Predicates 534 //===--------------------------------------------------------------------===// 535 536 // The width of an integer, as defined in C99 6.2.6.2. This is the number 537 // of bits in an integer type excluding any padding bits. 538 unsigned getIntWidth(QualType T); 539 540 // Per C99 6.2.5p6, for every signed integer type, there is a corresponding 541 // unsigned integer type. This method takes a signed type, and returns the 542 // corresponding unsigned integer type. 543 QualType getCorrespondingUnsignedType(QualType T); 544 545 //===--------------------------------------------------------------------===// 546 // Type Iterators. 547 //===--------------------------------------------------------------------===// 548 549 typedef std::vector<Type*>::iterator type_iterator; 550 typedef std::vector<Type*>::const_iterator const_type_iterator; 551 552 type_iterator types_begin() { return Types.begin(); } 553 type_iterator types_end() { return Types.end(); } 554 const_type_iterator types_begin() const { return Types.begin(); } 555 const_type_iterator types_end() const { return Types.end(); } 556 557 //===--------------------------------------------------------------------===// 558 // Serialization 559 //===--------------------------------------------------------------------===// 560 561 void Emit(llvm::Serializer& S) const; 562 static ASTContext* Create(llvm::Deserializer& D); 563 564private: 565 ASTContext(const ASTContext&); // DO NOT IMPLEMENT 566 void operator=(const ASTContext&); // DO NOT IMPLEMENT 567 568 void InitBuiltinTypes(); 569 void InitBuiltinType(QualType &R, BuiltinType::Kind K); 570 571 // Return the ObjC type encoding for a given type. 572 void getObjCEncodingForTypeImpl(QualType t, std::string &S, 573 bool ExpandPointedToStructures, 574 bool ExpandStructures, 575 FieldDecl *Field, 576 bool OutermostType = false, 577 bool EncodingProperty = false) const; 578 579}; 580 581} // end namespace clang 582 583// operator new and delete aren't allowed inside namespaces. 584// The throw specifications are mandated by the standard. 585/// @brief Placement new for using the ASTContext's allocator. 586/// 587/// This placement form of operator new uses the ASTContext's allocator for 588/// obtaining memory. It is a non-throwing new, which means that it returns 589/// null on error. (If that is what the allocator does. The current does, so if 590/// this ever changes, this operator will have to be changed, too.) 591/// Usage looks like this (assuming there's an ASTContext 'Context' in scope): 592/// @code 593/// // Default alignment (16) 594/// IntegerLiteral *Ex = new (Context) IntegerLiteral(arguments); 595/// // Specific alignment 596/// IntegerLiteral *Ex2 = new (Context, 8) IntegerLiteral(arguments); 597/// @endcode 598/// Please note that you cannot use delete on the pointer; it must be 599/// deallocated using an explicit destructor call followed by 600/// @c Context.getAllocator().Deallocate(Ptr) 601/// 602/// @param Bytes The number of bytes to allocate. Calculated by the compiler. 603/// @param C The ASTContext that provides the allocator. 604/// @param Alignment The alignment of the allocated memory (if the allocator 605/// supports it, which the current one doesn't). 606/// @return The allocated memory. Could be NULL. 607inline void *operator new(size_t Bytes, clang::ASTContext &C, 608 size_t Alignment = 16) throw () { 609 return C.Allocate(Bytes, Alignment); 610} 611/// @brief Placement delete companion to the new above. 612/// 613/// This operator is just a companion to the new above. There is no way of 614/// invoking it directly; see the new operator for more details. This operator 615/// is called implicitly by the compiler if a placement new expression using 616/// the ASTContext throws in the object constructor. 617inline void operator delete(void *Ptr, clang::ASTContext &C) 618 throw () { 619 C.Deallocate(Ptr); 620} 621 622#endif 623