ASTContext.h revision 34ebde404dc17d89487b07e6daaf1b47d5dfee39
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 const LangOptions& getLangOptions() const { return LangOpts; } 133 134 FullSourceLoc getFullLoc(SourceLocation Loc) const { 135 return FullSourceLoc(Loc,SourceMgr); 136 } 137 138 TranslationUnitDecl *getTranslationUnitDecl() const { return TUDecl; } 139 140 /// This is intentionally not serialized. It is populated by the 141 /// ASTContext ctor, and there are no external pointers/references to 142 /// internal variables of BuiltinInfo. 143 Builtin::Context BuiltinInfo; 144 145 // Builtin Types. 146 QualType VoidTy; 147 QualType BoolTy; 148 QualType CharTy; 149 QualType WCharTy; // [C++ 3.9.1p5] 150 QualType SignedCharTy, ShortTy, IntTy, LongTy, LongLongTy; 151 QualType UnsignedCharTy, UnsignedShortTy, UnsignedIntTy, UnsignedLongTy; 152 QualType UnsignedLongLongTy; 153 QualType FloatTy, DoubleTy, LongDoubleTy; 154 QualType FloatComplexTy, DoubleComplexTy, LongDoubleComplexTy; 155 QualType VoidPtrTy; 156 QualType OverloadTy; 157 QualType DependentTy; 158 159 ASTContext(const LangOptions& LOpts, SourceManager &SM, TargetInfo &t, 160 IdentifierTable &idents, SelectorTable &sels, 161 unsigned size_reserve=0); 162 163 ~ASTContext(); 164 165 void PrintStats() const; 166 const std::vector<Type*>& getTypes() const { return Types; } 167 168 //===--------------------------------------------------------------------===// 169 // Type Constructors 170 //===--------------------------------------------------------------------===// 171 172 /// getASQualType - Return the uniqued reference to the type for an address 173 /// space qualified type with the specified type and address space. The 174 /// resulting type has a union of the qualifiers from T and the address space. 175 // If T already has an address space specifier, it is silently replaced. 176 QualType getASQualType(QualType T, unsigned AddressSpace); 177 178 /// getComplexType - Return the uniqued reference to the type for a complex 179 /// number with the specified element type. 180 QualType getComplexType(QualType T); 181 182 /// getPointerType - Return the uniqued reference to the type for a pointer to 183 /// the specified type. 184 QualType getPointerType(QualType T); 185 186 /// getBlockPointerType - Return the uniqued reference to the type for a block 187 /// of the specified type. 188 QualType getBlockPointerType(QualType T); 189 190 /// getReferenceType - Return the uniqued reference to the type for a 191 /// reference to the specified type. 192 QualType getReferenceType(QualType T); 193 194 /// getMemberPointerType - Return the uniqued reference to the type for a 195 /// member pointer to the specified type in the specified class. The class 196 /// is a Type because it could be a dependent name. 197 QualType getMemberPointerType(QualType T, const Type *Cls); 198 199 /// getVariableArrayType - Returns a non-unique reference to the type for a 200 /// variable array of the specified element type. 201 QualType getVariableArrayType(QualType EltTy, Expr *NumElts, 202 ArrayType::ArraySizeModifier ASM, 203 unsigned EltTypeQuals); 204 205 /// getDependentSizedArrayType - Returns a non-unique reference to 206 /// the type for a dependently-sized array of the specified element 207 /// type. FIXME: We will need these to be uniqued, or at least 208 /// comparable, at some point. 209 QualType getDependentSizedArrayType(QualType EltTy, Expr *NumElts, 210 ArrayType::ArraySizeModifier ASM, 211 unsigned EltTypeQuals); 212 213 /// getIncompleteArrayType - Returns a unique reference to the type for a 214 /// incomplete array of the specified element type. 215 QualType getIncompleteArrayType(QualType EltTy, 216 ArrayType::ArraySizeModifier ASM, 217 unsigned EltTypeQuals); 218 219 /// getConstantArrayType - Return the unique reference to the type for a 220 /// constant array of the specified element type. 221 QualType getConstantArrayType(QualType EltTy, const llvm::APInt &ArySize, 222 ArrayType::ArraySizeModifier ASM, 223 unsigned EltTypeQuals); 224 225 /// getVectorType - Return the unique reference to a vector type of 226 /// the specified element type and size. VectorType must be a built-in type. 227 QualType getVectorType(QualType VectorType, unsigned NumElts); 228 229 /// getExtVectorType - Return the unique reference to an extended vector type 230 /// of the specified element type and size. VectorType must be a built-in 231 /// type. 232 QualType getExtVectorType(QualType VectorType, unsigned NumElts); 233 234 /// getFunctionTypeNoProto - Return a K&R style C function type like 'int()'. 235 /// 236 QualType getFunctionTypeNoProto(QualType ResultTy); 237 238 /// getFunctionType - Return a normal function type with a typed argument 239 /// list. isVariadic indicates whether the argument list includes '...'. 240 QualType getFunctionType(QualType ResultTy, const QualType *ArgArray, 241 unsigned NumArgs, bool isVariadic, 242 unsigned TypeQuals); 243 244 /// getTypeDeclType - Return the unique reference to the type for 245 /// the specified type declaration. 246 QualType getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl=0); 247 248 /// getTypedefType - Return the unique reference to the type for the 249 /// specified typename decl. 250 QualType getTypedefType(TypedefDecl *Decl); 251 QualType getTemplateTypeParmType(TemplateTypeParmDecl *Decl); 252 QualType getObjCInterfaceType(ObjCInterfaceDecl *Decl); 253 254 /// getObjCQualifiedInterfaceType - Return a 255 /// ObjCQualifiedInterfaceType type for the given interface decl and 256 /// the conforming protocol list. 257 QualType getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 258 ObjCProtocolDecl **ProtocolList, unsigned NumProtocols); 259 260 /// getObjCQualifiedIdType - Return an ObjCQualifiedIdType for a 261 /// given 'id' and conforming protocol list. 262 QualType getObjCQualifiedIdType(ObjCProtocolDecl **ProtocolList, 263 unsigned NumProtocols); 264 265 266 /// getTypeOfType - GCC extension. 267 QualType getTypeOfExpr(Expr *e); 268 QualType getTypeOfType(QualType t); 269 270 /// getTagDeclType - Return the unique reference to the type for the 271 /// specified TagDecl (struct/union/class/enum) decl. 272 QualType getTagDeclType(TagDecl *Decl); 273 274 /// getSizeType - Return the unique type for "size_t" (C99 7.17), defined 275 /// in <stddef.h>. The sizeof operator requires this (C99 6.5.3.4p4). 276 QualType getSizeType() const; 277 278 /// getWCharType - Return the unique type for "wchar_t" (C99 7.17), defined 279 /// in <stddef.h>. Wide strings require this (C99 6.4.5p5). 280 QualType getWCharType() const; 281 282 /// getSignedWCharType - Return the type of "signed wchar_t". 283 /// Used when in C++, as a GCC extension. 284 QualType getSignedWCharType() const; 285 286 /// getUnsignedWCharType - Return the type of "unsigned wchar_t". 287 /// Used when in C++, as a GCC extension. 288 QualType getUnsignedWCharType() const; 289 290 /// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 291 /// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 292 QualType getPointerDiffType() const; 293 294 // getCFConstantStringType - Return the C structure type used to represent 295 // constant CFStrings. 296 QualType getCFConstantStringType(); 297 298 // This setter/getter represents the ObjC type for an NSConstantString. 299 void setObjCConstantStringInterface(ObjCInterfaceDecl *Decl); 300 QualType getObjCConstantStringInterface() const { 301 return ObjCConstantStringType; 302 } 303 304 //// This gets the struct used to keep track of fast enumerations. 305 QualType getObjCFastEnumerationStateType(); 306 307 /// getObjCEncodingForType - Emit the ObjC type encoding for the 308 /// given type into \arg S. If \arg NameFields is specified then 309 /// record field names are also encoded. 310 void getObjCEncodingForType(QualType t, std::string &S, 311 FieldDecl *Field=NULL) const; 312 313 void getLegacyIntegralTypeEncoding(QualType &t) const; 314 315 // Put the string version of type qualifiers into S. 316 void getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 317 std::string &S) const; 318 319 /// getObjCEncodingForMethodDecl - Return the encoded type for this method 320 /// declaration. 321 void getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, std::string &S); 322 323 /// getObjCEncodingForPropertyDecl - Return the encoded type for 324 /// this method declaration. If non-NULL, Container must be either 325 /// an ObjCCategoryImplDecl or ObjCImplementationDecl; it should 326 /// only be NULL when getting encodings for protocol properties. 327 void getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 328 const Decl *Container, 329 std::string &S); 330 331 /// getObjCEncodingTypeSize returns size of type for objective-c encoding 332 /// purpose. 333 int getObjCEncodingTypeSize(QualType t); 334 335 /// This setter/getter represents the ObjC 'id' type. It is setup lazily, by 336 /// Sema. id is always a (typedef for a) pointer type, a pointer to a struct. 337 QualType getObjCIdType() const { return ObjCIdType; } 338 void setObjCIdType(TypedefDecl *Decl); 339 340 void setObjCSelType(TypedefDecl *Decl); 341 QualType getObjCSelType() const { return ObjCSelType; } 342 343 void setObjCProtoType(QualType QT); 344 QualType getObjCProtoType() const { return ObjCProtoType; } 345 346 /// This setter/getter repreents the ObjC 'Class' type. It is setup lazily, by 347 /// Sema. 'Class' is always a (typedef for a) pointer type, a pointer to a 348 /// struct. 349 QualType getObjCClassType() const { return ObjCClassType; } 350 void setObjCClassType(TypedefDecl *Decl); 351 352 void setBuiltinVaListType(QualType T); 353 QualType getBuiltinVaListType() const { return BuiltinVaListType; } 354 355private: 356 QualType getFromTargetType(unsigned Type) const; 357 358 //===--------------------------------------------------------------------===// 359 // Type Predicates. 360 //===--------------------------------------------------------------------===// 361 362public: 363 /// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 364 /// to an object type. This includes "id" and "Class" (two 'special' pointers 365 /// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 366 /// ID type). 367 bool isObjCObjectPointerType(QualType Ty) const; 368 369 /// isObjCNSObjectType - Return true if this is an NSObject object with 370 /// its NSObject attribute set. 371 bool isObjCNSObjectType(QualType Ty) const; 372 373 //===--------------------------------------------------------------------===// 374 // Type Sizing and Analysis 375 //===--------------------------------------------------------------------===// 376 377 /// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 378 /// scalar floating point type. 379 const llvm::fltSemantics &getFloatTypeSemantics(QualType T) const; 380 381 /// getTypeInfo - Get the size and alignment of the specified complete type in 382 /// bits. 383 std::pair<uint64_t, unsigned> getTypeInfo(const Type *T); 384 std::pair<uint64_t, unsigned> getTypeInfo(QualType T) { 385 return getTypeInfo(T.getTypePtr()); 386 } 387 388 /// getTypeSize - Return the size of the specified type, in bits. This method 389 /// does not work on incomplete types. 390 uint64_t getTypeSize(QualType T) { 391 return getTypeInfo(T).first; 392 } 393 uint64_t getTypeSize(const Type *T) { 394 return getTypeInfo(T).first; 395 } 396 397 /// getTypeAlign - Return the ABI-specified alignment of a type, in bits. 398 /// This method does not work on incomplete types. 399 unsigned getTypeAlign(QualType T) { 400 return getTypeInfo(T).second; 401 } 402 unsigned getTypeAlign(const Type *T) { 403 return getTypeInfo(T).second; 404 } 405 406 /// getPreferredTypeAlign - Return the "preferred" alignment of the specified 407 /// type for the current target in bits. This can be different than the ABI 408 /// alignment in cases where it is beneficial for performance to overalign 409 /// a data type. 410 unsigned getPreferredTypeAlign(const Type *T); 411 412 /// getDeclAlign - Return the alignment of the specified decl that should be 413 /// returned by __alignof(). Note that bitfields do not have a valid 414 /// alignment, so this method will assert on them. 415 unsigned getDeclAlign(const Decl *D); 416 417 /// getASTRecordLayout - Get or compute information about the layout of the 418 /// specified record (struct/union/class), which indicates its size and field 419 /// position information. 420 const ASTRecordLayout &getASTRecordLayout(const RecordDecl *D); 421 422 const ASTRecordLayout &getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D); 423 const RecordDecl *addRecordToClass(const ObjCInterfaceDecl *D); 424 const FieldDecl *getFieldDecl(const ObjCIvarRefExpr *MRef) { 425 llvm::DenseMap<const ObjCIvarRefExpr *, const FieldDecl*>::iterator I 426 = ASTFieldForIvarRef.find(MRef); 427 assert (I != ASTFieldForIvarRef.end() && "Unable to find field_decl"); 428 return I->second; 429 } 430 void setFieldDecl(const ObjCInterfaceDecl *OI, 431 const ObjCIvarDecl *Ivar, 432 const ObjCIvarRefExpr *MRef); 433 //===--------------------------------------------------------------------===// 434 // Type Operators 435 //===--------------------------------------------------------------------===// 436 437 /// getCanonicalType - Return the canonical (structural) type corresponding to 438 /// the specified potentially non-canonical type. The non-canonical version 439 /// of a type may have many "decorated" versions of types. Decorators can 440 /// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 441 /// to be free of any of these, allowing two canonical types to be compared 442 /// for exact equality with a simple pointer comparison. 443 QualType getCanonicalType(QualType T); 444 const Type *getCanonicalType(const Type *T) { 445 return T->getCanonicalTypeInternal().getTypePtr(); 446 } 447 448 /// Type Query functions. If the type is an instance of the specified class, 449 /// return the Type pointer for the underlying maximally pretty type. This 450 /// is a member of ASTContext because this may need to do some amount of 451 /// canonicalization, e.g. to move type qualifiers into the element type. 452 const ArrayType *getAsArrayType(QualType T); 453 const ConstantArrayType *getAsConstantArrayType(QualType T) { 454 return dyn_cast_or_null<ConstantArrayType>(getAsArrayType(T)); 455 } 456 const VariableArrayType *getAsVariableArrayType(QualType T) { 457 return dyn_cast_or_null<VariableArrayType>(getAsArrayType(T)); 458 } 459 const IncompleteArrayType *getAsIncompleteArrayType(QualType T) { 460 return dyn_cast_or_null<IncompleteArrayType>(getAsArrayType(T)); 461 } 462 463 /// getBaseElementType - Returns the innermost element type of a variable 464 /// length array type. For example, will return "int" for int[m][n] 465 QualType getBaseElementType(const VariableArrayType *VAT); 466 467 /// getArrayDecayedType - Return the properly qualified result of decaying the 468 /// specified array type to a pointer. This operation is non-trivial when 469 /// handling typedefs etc. The canonical type of "T" must be an array type, 470 /// this returns a pointer to a properly qualified element of the array. 471 /// 472 /// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 473 QualType getArrayDecayedType(QualType T); 474 475 /// getIntegerTypeOrder - Returns the highest ranked integer type: 476 /// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 477 /// LHS < RHS, return -1. 478 int getIntegerTypeOrder(QualType LHS, QualType RHS); 479 480 /// getFloatingTypeOrder - Compare the rank of the two specified floating 481 /// point types, ignoring the domain of the type (i.e. 'double' == 482 /// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 483 /// LHS < RHS, return -1. 484 int getFloatingTypeOrder(QualType LHS, QualType RHS); 485 486 /// getFloatingTypeOfSizeWithinDomain - Returns a real floating 487 /// point or a complex type (based on typeDomain/typeSize). 488 /// 'typeDomain' is a real floating point or complex type. 489 /// 'typeSize' is a real floating point or complex type. 490 QualType getFloatingTypeOfSizeWithinDomain(QualType typeSize, 491 QualType typeDomain) const; 492 493 //===--------------------------------------------------------------------===// 494 // Type Compatibility Predicates 495 //===--------------------------------------------------------------------===// 496 497 /// Compatibility predicates used to check assignment expressions. 498 bool typesAreCompatible(QualType, QualType); // C99 6.2.7p1 499 bool typesAreBlockCompatible(QualType lhs, QualType rhs); 500 501 bool isObjCIdType(QualType T) const { 502 if (!IdStructType) // ObjC isn't enabled 503 return false; 504 return T->getAsStructureType() == IdStructType; 505 } 506 bool isObjCClassType(QualType T) const { 507 if (!ClassStructType) // ObjC isn't enabled 508 return false; 509 return T->getAsStructureType() == ClassStructType; 510 } 511 bool isObjCSelType(QualType T) const { 512 assert(SelStructType && "isObjCSelType used before 'SEL' type is built"); 513 return T->getAsStructureType() == SelStructType; 514 } 515 516 // Check the safety of assignment from LHS to RHS 517 bool canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 518 const ObjCInterfaceType *RHS); 519 520 // Functions for calculating composite types 521 QualType mergeTypes(QualType, QualType); 522 QualType mergeFunctionTypes(QualType, QualType); 523 524 //===--------------------------------------------------------------------===// 525 // Integer Predicates 526 //===--------------------------------------------------------------------===// 527 528 // The width of an integer, as defined in C99 6.2.6.2. This is the number 529 // of bits in an integer type excluding any padding bits. 530 unsigned getIntWidth(QualType T); 531 532 // Per C99 6.2.5p6, for every signed integer type, there is a corresponding 533 // unsigned integer type. This method takes a signed type, and returns the 534 // corresponding unsigned integer type. 535 QualType getCorrespondingUnsignedType(QualType T); 536 537 //===--------------------------------------------------------------------===// 538 // Type Iterators. 539 //===--------------------------------------------------------------------===// 540 541 typedef std::vector<Type*>::iterator type_iterator; 542 typedef std::vector<Type*>::const_iterator const_type_iterator; 543 544 type_iterator types_begin() { return Types.begin(); } 545 type_iterator types_end() { return Types.end(); } 546 const_type_iterator types_begin() const { return Types.begin(); } 547 const_type_iterator types_end() const { return Types.end(); } 548 549 //===--------------------------------------------------------------------===// 550 // Serialization 551 //===--------------------------------------------------------------------===// 552 553 void Emit(llvm::Serializer& S) const; 554 static ASTContext* Create(llvm::Deserializer& D); 555 556private: 557 ASTContext(const ASTContext&); // DO NOT IMPLEMENT 558 void operator=(const ASTContext&); // DO NOT IMPLEMENT 559 560 void InitBuiltinTypes(); 561 void InitBuiltinType(QualType &R, BuiltinType::Kind K); 562 563 // Return the ObjC type encoding for a given type. 564 void getObjCEncodingForTypeImpl(QualType t, std::string &S, 565 bool ExpandPointedToStructures, 566 bool ExpandStructures, 567 FieldDecl *Field, 568 bool OutermostType = false, 569 bool EncodingProperty = false) const; 570 571}; 572 573} // end namespace clang 574 575// operator new and delete aren't allowed inside namespaces. 576// The throw specifications are mandated by the standard. 577/// @brief Placement new for using the ASTContext's allocator. 578/// 579/// This placement form of operator new uses the ASTContext's allocator for 580/// obtaining memory. It is a non-throwing new, which means that it returns 581/// null on error. (If that is what the allocator does. The current does, so if 582/// this ever changes, this operator will have to be changed, too.) 583/// Usage looks like this (assuming there's an ASTContext 'Context' in scope): 584/// @code 585/// // Default alignment (16) 586/// IntegerLiteral *Ex = new (Context) IntegerLiteral(arguments); 587/// // Specific alignment 588/// IntegerLiteral *Ex2 = new (Context, 8) IntegerLiteral(arguments); 589/// @endcode 590/// Please note that you cannot use delete on the pointer; it must be 591/// deallocated using an explicit destructor call followed by 592/// @c Context.getAllocator().Deallocate(Ptr) 593/// 594/// @param Bytes The number of bytes to allocate. Calculated by the compiler. 595/// @param C The ASTContext that provides the allocator. 596/// @param Alignment The alignment of the allocated memory (if the allocator 597/// supports it, which the current one doesn't). 598/// @return The allocated memory. Could be NULL. 599inline void *operator new(size_t Bytes, clang::ASTContext &C, 600 size_t Alignment = 16) throw () { 601 return C.getAllocator().Allocate(Bytes, Alignment); 602} 603/// @brief Placement delete companion to the new above. 604/// 605/// This operator is just a companion to the new above. There is no way of 606/// invoking it directly; see the new operator for more details. This operator 607/// is called implicitly by the compiler if a placement new expression using 608/// the ASTContext throws in the object constructor. 609inline void operator delete(void *Ptr, clang::ASTContext &C) 610 throw () { 611 C.getAllocator().Deallocate(Ptr); 612} 613 614#endif 615