ASTContext.h revision 33c37b9b87453c835cd0e32a4a65db329da20356
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/Attr.h" 20#include "clang/AST/Builtins.h" 21#include "clang/AST/Decl.h" 22#include "clang/AST/NestedNameSpecifier.h" 23#include "clang/AST/TemplateName.h" 24#include "clang/AST/Type.h" 25#include "clang/Basic/SourceLocation.h" 26#include "llvm/ADT/DenseMap.h" 27#include "llvm/ADT/FoldingSet.h" 28#include "llvm/ADT/OwningPtr.h" 29#include "llvm/Support/Allocator.h" 30#include <vector> 31 32namespace llvm { 33 struct fltSemantics; 34} 35 36namespace clang { 37 class FileManager; 38 class ASTRecordLayout; 39 class Expr; 40 class ExternalASTSource; 41 class IdentifierTable; 42 class SelectorTable; 43 class SourceManager; 44 class TargetInfo; 45 // Decls 46 class Decl; 47 class ObjCPropertyDecl; 48 class RecordDecl; 49 class TagDecl; 50 class TranslationUnitDecl; 51 class TypeDecl; 52 class TypedefDecl; 53 class TemplateTypeParmDecl; 54 class FieldDecl; 55 class ObjCIvarRefExpr; 56 class ObjCIvarDecl; 57 58/// ASTContext - This class holds long-lived AST nodes (such as types and 59/// decls) that can be referred to throughout the semantic analysis of a file. 60class ASTContext { 61 std::vector<Type*> Types; 62 llvm::FoldingSet<ExtQualType> ExtQualTypes; 63 llvm::FoldingSet<ComplexType> ComplexTypes; 64 llvm::FoldingSet<PointerType> PointerTypes; 65 llvm::FoldingSet<BlockPointerType> BlockPointerTypes; 66 llvm::FoldingSet<LValueReferenceType> LValueReferenceTypes; 67 llvm::FoldingSet<RValueReferenceType> RValueReferenceTypes; 68 llvm::FoldingSet<MemberPointerType> MemberPointerTypes; 69 llvm::FoldingSet<ConstantArrayType> ConstantArrayTypes; 70 llvm::FoldingSet<IncompleteArrayType> IncompleteArrayTypes; 71 std::vector<VariableArrayType*> VariableArrayTypes; 72 std::vector<DependentSizedArrayType*> DependentSizedArrayTypes; 73 llvm::FoldingSet<VectorType> VectorTypes; 74 llvm::FoldingSet<FunctionNoProtoType> FunctionNoProtoTypes; 75 llvm::FoldingSet<FunctionProtoType> FunctionProtoTypes; 76 llvm::FoldingSet<TemplateTypeParmType> TemplateTypeParmTypes; 77 llvm::FoldingSet<TemplateSpecializationType> TemplateSpecializationTypes; 78 llvm::FoldingSet<QualifiedNameType> QualifiedNameTypes; 79 llvm::FoldingSet<TypenameType> TypenameTypes; 80 llvm::FoldingSet<ObjCQualifiedInterfaceType> ObjCQualifiedInterfaceTypes; 81 llvm::FoldingSet<ObjCQualifiedIdType> ObjCQualifiedIdTypes; 82 83 llvm::FoldingSet<QualifiedTemplateName> QualifiedTemplateNames; 84 llvm::FoldingSet<DependentTemplateName> DependentTemplateNames; 85 86 /// \brief The set of nested name specifiers. 87 /// 88 /// This set is managed by the NestedNameSpecifier class. 89 llvm::FoldingSet<NestedNameSpecifier> NestedNameSpecifiers; 90 NestedNameSpecifier *GlobalNestedNameSpecifier; 91 friend class NestedNameSpecifier; 92 93 /// ASTRecordLayouts - A cache mapping from RecordDecls to ASTRecordLayouts. 94 /// This is lazily created. This is intentionally not serialized. 95 llvm::DenseMap<const RecordDecl*, const ASTRecordLayout*> ASTRecordLayouts; 96 llvm::DenseMap<const ObjCContainerDecl*, const ASTRecordLayout*> ObjCLayouts; 97 98 llvm::DenseMap<unsigned, FixedWidthIntType*> SignedFixedWidthIntTypes; 99 llvm::DenseMap<unsigned, FixedWidthIntType*> UnsignedFixedWidthIntTypes; 100 101 /// BuiltinVaListType - built-in va list type. 102 /// This is initially null and set by Sema::LazilyCreateBuiltin when 103 /// a builtin that takes a valist is encountered. 104 QualType BuiltinVaListType; 105 106 /// ObjCIdType - a pseudo built-in typedef type (set by Sema). 107 QualType ObjCIdType; 108 const RecordType *IdStructType; 109 110 /// ObjCSelType - another pseudo built-in typedef type (set by Sema). 111 QualType ObjCSelType; 112 const RecordType *SelStructType; 113 114 /// ObjCProtoType - another pseudo built-in typedef type (set by Sema). 115 QualType ObjCProtoType; 116 const RecordType *ProtoStructType; 117 118 /// ObjCClassType - another pseudo built-in typedef type (set by Sema). 119 QualType ObjCClassType; 120 const RecordType *ClassStructType; 121 122 QualType ObjCConstantStringType; 123 RecordDecl *CFConstantStringTypeDecl; 124 125 RecordDecl *ObjCFastEnumerationStateTypeDecl; 126 127 TranslationUnitDecl *TUDecl; 128 129 /// SourceMgr - The associated SourceManager object. 130 SourceManager &SourceMgr; 131 132 /// LangOpts - The language options used to create the AST associated with 133 /// this ASTContext object. 134 LangOptions LangOpts; 135 136 /// MallocAlloc/BumpAlloc - The allocator objects used to create AST objects. 137 bool FreeMemory; 138 llvm::MallocAllocator MallocAlloc; 139 llvm::BumpPtrAllocator BumpAlloc; 140public: 141 TargetInfo &Target; 142 IdentifierTable &Idents; 143 SelectorTable &Selectors; 144 DeclarationNameTable DeclarationNames; 145 llvm::OwningPtr<ExternalASTSource> ExternalSource; 146 147 SourceManager& getSourceManager() { return SourceMgr; } 148 const SourceManager& getSourceManager() const { return SourceMgr; } 149 void *Allocate(unsigned Size, unsigned Align = 8) { 150 return FreeMemory ? MallocAlloc.Allocate(Size, Align) : 151 BumpAlloc.Allocate(Size, Align); 152 } 153 void Deallocate(void *Ptr) { 154 if (FreeMemory) 155 MallocAlloc.Deallocate(Ptr); 156 } 157 const LangOptions& getLangOptions() const { return LangOpts; } 158 159 FullSourceLoc getFullLoc(SourceLocation Loc) const { 160 return FullSourceLoc(Loc,SourceMgr); 161 } 162 163 TranslationUnitDecl *getTranslationUnitDecl() const { return TUDecl; } 164 165 Builtin::Context BuiltinInfo; 166 167 // Builtin Types. 168 QualType VoidTy; 169 QualType BoolTy; 170 QualType CharTy; 171 QualType WCharTy; // [C++ 3.9.1p5], integer type in C99. 172 QualType SignedCharTy, ShortTy, IntTy, LongTy, LongLongTy, Int128Ty; 173 QualType UnsignedCharTy, UnsignedShortTy, UnsignedIntTy, UnsignedLongTy; 174 QualType UnsignedLongLongTy, UnsignedInt128Ty; 175 QualType FloatTy, DoubleTy, LongDoubleTy; 176 QualType FloatComplexTy, DoubleComplexTy, LongDoubleComplexTy; 177 QualType VoidPtrTy; 178 QualType OverloadTy; 179 QualType DependentTy; 180 181 ASTContext(const LangOptions& LOpts, SourceManager &SM, TargetInfo &t, 182 IdentifierTable &idents, SelectorTable &sels, 183 bool FreeMemory = true, unsigned size_reserve=0, 184 bool InitializeBuiltins = true); 185 186 ~ASTContext(); 187 188 /// \brief Initialize builtins. 189 /// 190 /// Typically, this routine will be called automatically by the 191 /// constructor. However, in certain cases (e.g., when there is a 192 /// PCH file to be loaded), the constructor does not perform 193 /// initialization for builtins. This routine can be called to 194 /// perform the initialization. 195 void InitializeBuiltins(IdentifierTable &idents); 196 197 /// \brief Attach an external AST source to the AST context. 198 /// 199 /// The external AST source provides the ability to load parts of 200 /// the abstract syntax tree as needed from some external storage, 201 /// e.g., a precompiled header. 202 void setExternalSource(llvm::OwningPtr<ExternalASTSource> &Source); 203 204 /// \brief Retrieve a pointer to the external AST source associated 205 /// with this AST context, if any. 206 ExternalASTSource *getExternalSource() const { return ExternalSource.get(); } 207 208 TargetInfo& getTargetInfo() const { return Target; } 209 210 void PrintStats() const; 211 const std::vector<Type*>& getTypes() const { return Types; } 212 213 //===--------------------------------------------------------------------===// 214 // Type Constructors 215 //===--------------------------------------------------------------------===// 216 217 /// getAddSpaceQualType - Return the uniqued reference to the type for an 218 /// address space qualified type with the specified type and address space. 219 /// The resulting type has a union of the qualifiers from T and the address 220 /// space. If T already has an address space specifier, it is silently 221 /// replaced. 222 QualType getAddrSpaceQualType(QualType T, unsigned AddressSpace); 223 224 /// getObjCGCQualType - Returns the uniqued reference to the type for an 225 /// objc gc qualified type. The retulting type has a union of the qualifiers 226 /// from T and the gc attribute. 227 QualType getObjCGCQualType(QualType T, QualType::GCAttrTypes gcAttr); 228 229 /// getComplexType - Return the uniqued reference to the type for a complex 230 /// number with the specified element type. 231 QualType getComplexType(QualType T); 232 233 /// getPointerType - Return the uniqued reference to the type for a pointer to 234 /// the specified type. 235 QualType getPointerType(QualType T); 236 237 /// getBlockPointerType - Return the uniqued reference to the type for a block 238 /// of the specified type. 239 QualType getBlockPointerType(QualType T); 240 241 /// getLValueReferenceType - Return the uniqued reference to the type for an 242 /// lvalue reference to the specified type. 243 QualType getLValueReferenceType(QualType T); 244 245 /// getRValueReferenceType - Return the uniqued reference to the type for an 246 /// rvalue reference to the specified type. 247 QualType getRValueReferenceType(QualType T); 248 249 /// getMemberPointerType - Return the uniqued reference to the type for a 250 /// member pointer to the specified type in the specified class. The class 251 /// is a Type because it could be a dependent name. 252 QualType getMemberPointerType(QualType T, const Type *Cls); 253 254 /// getVariableArrayType - Returns a non-unique reference to the type for a 255 /// variable array of the specified element type. 256 QualType getVariableArrayType(QualType EltTy, Expr *NumElts, 257 ArrayType::ArraySizeModifier ASM, 258 unsigned EltTypeQuals); 259 260 /// getDependentSizedArrayType - Returns a non-unique reference to 261 /// the type for a dependently-sized array of the specified element 262 /// type. FIXME: We will need these to be uniqued, or at least 263 /// comparable, at some point. 264 QualType getDependentSizedArrayType(QualType EltTy, Expr *NumElts, 265 ArrayType::ArraySizeModifier ASM, 266 unsigned EltTypeQuals); 267 268 /// getIncompleteArrayType - Returns a unique reference to the type for a 269 /// incomplete array of the specified element type. 270 QualType getIncompleteArrayType(QualType EltTy, 271 ArrayType::ArraySizeModifier ASM, 272 unsigned EltTypeQuals); 273 274 /// getConstantArrayType - Return the unique reference to the type for a 275 /// constant array of the specified element type. 276 QualType getConstantArrayType(QualType EltTy, const llvm::APInt &ArySize, 277 ArrayType::ArraySizeModifier ASM, 278 unsigned EltTypeQuals); 279 280 /// getVectorType - Return the unique reference to a vector type of 281 /// the specified element type and size. VectorType must be a built-in type. 282 QualType getVectorType(QualType VectorType, unsigned NumElts); 283 284 /// getExtVectorType - Return the unique reference to an extended vector type 285 /// of the specified element type and size. VectorType must be a built-in 286 /// type. 287 QualType getExtVectorType(QualType VectorType, unsigned NumElts); 288 289 /// getFunctionNoProtoType - Return a K&R style C function type like 'int()'. 290 /// 291 QualType getFunctionNoProtoType(QualType ResultTy); 292 293 /// getFunctionType - Return a normal function type with a typed argument 294 /// list. isVariadic indicates whether the argument list includes '...'. 295 QualType getFunctionType(QualType ResultTy, const QualType *ArgArray, 296 unsigned NumArgs, bool isVariadic, 297 unsigned TypeQuals, bool hasExceptionSpec = false, 298 bool hasAnyExceptionSpec = false, 299 unsigned NumExs = 0, const QualType *ExArray = 0); 300 301 /// getTypeDeclType - Return the unique reference to the type for 302 /// the specified type declaration. 303 QualType getTypeDeclType(TypeDecl *Decl, TypeDecl* PrevDecl=0); 304 305 /// getTypedefType - Return the unique reference to the type for the 306 /// specified typename decl. 307 QualType getTypedefType(TypedefDecl *Decl); 308 QualType getObjCInterfaceType(const ObjCInterfaceDecl *Decl); 309 310 QualType getTemplateTypeParmType(unsigned Depth, unsigned Index, 311 IdentifierInfo *Name = 0); 312 313 QualType getTemplateSpecializationType(TemplateName T, 314 const TemplateArgument *Args, 315 unsigned NumArgs, 316 QualType Canon = QualType()); 317 318 QualType getQualifiedNameType(NestedNameSpecifier *NNS, 319 QualType NamedType); 320 QualType getTypenameType(NestedNameSpecifier *NNS, 321 const IdentifierInfo *Name, 322 QualType Canon = QualType()); 323 QualType getTypenameType(NestedNameSpecifier *NNS, 324 const TemplateSpecializationType *TemplateId, 325 QualType Canon = QualType()); 326 327 /// getObjCQualifiedInterfaceType - Return a 328 /// ObjCQualifiedInterfaceType type for the given interface decl and 329 /// the conforming protocol list. 330 QualType getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl, 331 ObjCProtocolDecl **ProtocolList, 332 unsigned NumProtocols); 333 334 /// getObjCQualifiedIdType - Return an ObjCQualifiedIdType for a 335 /// given 'id' and conforming protocol list. 336 QualType getObjCQualifiedIdType(ObjCProtocolDecl **ProtocolList, 337 unsigned NumProtocols); 338 339 340 /// getTypeOfType - GCC extension. 341 QualType getTypeOfExprType(Expr *e); 342 QualType getTypeOfType(QualType t); 343 344 /// getTagDeclType - Return the unique reference to the type for the 345 /// specified TagDecl (struct/union/class/enum) decl. 346 QualType getTagDeclType(TagDecl *Decl); 347 348 /// getSizeType - Return the unique type for "size_t" (C99 7.17), defined 349 /// in <stddef.h>. The sizeof operator requires this (C99 6.5.3.4p4). 350 QualType getSizeType() const; 351 352 /// getWCharType - In C++, this returns the unique wchar_t type. In C99, this 353 /// returns a type compatible with the type defined in <stddef.h> as defined 354 /// by the target. 355 QualType getWCharType() const { return WCharTy; } 356 357 /// getSignedWCharType - Return the type of "signed wchar_t". 358 /// Used when in C++, as a GCC extension. 359 QualType getSignedWCharType() const; 360 361 /// getUnsignedWCharType - Return the type of "unsigned wchar_t". 362 /// Used when in C++, as a GCC extension. 363 QualType getUnsignedWCharType() const; 364 365 /// getPointerDiffType - Return the unique type for "ptrdiff_t" (ref?) 366 /// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9). 367 QualType getPointerDiffType() const; 368 369 // getCFConstantStringType - Return the C structure type used to represent 370 // constant CFStrings. 371 QualType getCFConstantStringType(); 372 373 /// Get the structure type used to representation CFStrings, or NULL 374 /// if it hasn't yet been built. 375 QualType getRawCFConstantStringType() { 376 if (CFConstantStringTypeDecl) 377 return getTagDeclType(CFConstantStringTypeDecl); 378 return QualType(); 379 } 380 void setCFConstantStringType(QualType T); 381 382 // This setter/getter represents the ObjC type for an NSConstantString. 383 void setObjCConstantStringInterface(ObjCInterfaceDecl *Decl); 384 QualType getObjCConstantStringInterface() const { 385 return ObjCConstantStringType; 386 } 387 388 //// This gets the struct used to keep track of fast enumerations. 389 QualType getObjCFastEnumerationStateType(); 390 391 /// Get the ObjCFastEnumerationState type, or NULL if it hasn't yet 392 /// been built. 393 QualType getRawObjCFastEnumerationStateType() { 394 if (ObjCFastEnumerationStateTypeDecl) 395 return getTagDeclType(ObjCFastEnumerationStateTypeDecl); 396 return QualType(); 397 } 398 399 void setObjCFastEnumerationStateType(QualType T); 400 401 /// getObjCEncodingForType - Emit the ObjC type encoding for the 402 /// given type into \arg S. If \arg NameFields is specified then 403 /// record field names are also encoded. 404 void getObjCEncodingForType(QualType t, std::string &S, 405 const FieldDecl *Field=0); 406 407 void getLegacyIntegralTypeEncoding(QualType &t) const; 408 409 // Put the string version of type qualifiers into S. 410 void getObjCEncodingForTypeQualifier(Decl::ObjCDeclQualifier QT, 411 std::string &S) const; 412 413 /// getObjCEncodingForMethodDecl - Return the encoded type for this method 414 /// declaration. 415 void getObjCEncodingForMethodDecl(const ObjCMethodDecl *Decl, std::string &S); 416 417 /// getObjCEncodingForPropertyDecl - Return the encoded type for 418 /// this method declaration. If non-NULL, Container must be either 419 /// an ObjCCategoryImplDecl or ObjCImplementationDecl; it should 420 /// only be NULL when getting encodings for protocol properties. 421 void getObjCEncodingForPropertyDecl(const ObjCPropertyDecl *PD, 422 const Decl *Container, 423 std::string &S); 424 425 /// getObjCEncodingTypeSize returns size of type for objective-c encoding 426 /// purpose. 427 int getObjCEncodingTypeSize(QualType t); 428 429 /// This setter/getter represents the ObjC 'id' type. It is setup lazily, by 430 /// Sema. id is always a (typedef for a) pointer type, a pointer to a struct. 431 QualType getObjCIdType() const { return ObjCIdType; } 432 void setObjCIdType(QualType T); 433 434 void setObjCSelType(QualType T); 435 QualType getObjCSelType() const { return ObjCSelType; } 436 437 void setObjCProtoType(QualType QT); 438 QualType getObjCProtoType() const { return ObjCProtoType; } 439 440 /// This setter/getter repreents the ObjC 'Class' type. It is setup lazily, by 441 /// Sema. 'Class' is always a (typedef for a) pointer type, a pointer to a 442 /// struct. 443 QualType getObjCClassType() const { return ObjCClassType; } 444 void setObjCClassType(QualType T); 445 446 void setBuiltinVaListType(QualType T); 447 QualType getBuiltinVaListType() const { return BuiltinVaListType; } 448 449 QualType getFixedWidthIntType(unsigned Width, bool Signed); 450 451 TemplateName getQualifiedTemplateName(NestedNameSpecifier *NNS, 452 bool TemplateKeyword, 453 TemplateDecl *Template); 454 455 TemplateName getDependentTemplateName(NestedNameSpecifier *NNS, 456 const IdentifierInfo *Name); 457 458private: 459 QualType getFromTargetType(unsigned Type) const; 460 461 //===--------------------------------------------------------------------===// 462 // Type Predicates. 463 //===--------------------------------------------------------------------===// 464 465public: 466 /// isObjCObjectPointerType - Returns true if type is an Objective-C pointer 467 /// to an object type. This includes "id" and "Class" (two 'special' pointers 468 /// to struct), Interface* (pointer to ObjCInterfaceType) and id<P> (qualified 469 /// ID type). 470 bool isObjCObjectPointerType(QualType Ty) const; 471 472 /// getObjCGCAttr - Returns one of GCNone, Weak or Strong objc's 473 /// garbage collection attribute. 474 /// 475 QualType::GCAttrTypes getObjCGCAttrKind(const QualType &Ty) const; 476 477 /// isObjCNSObjectType - Return true if this is an NSObject object with 478 /// its NSObject attribute set. 479 bool isObjCNSObjectType(QualType Ty) const; 480 481 //===--------------------------------------------------------------------===// 482 // Type Sizing and Analysis 483 //===--------------------------------------------------------------------===// 484 485 /// getFloatTypeSemantics - Return the APFloat 'semantics' for the specified 486 /// scalar floating point type. 487 const llvm::fltSemantics &getFloatTypeSemantics(QualType T) const; 488 489 /// getTypeInfo - Get the size and alignment of the specified complete type in 490 /// bits. 491 std::pair<uint64_t, unsigned> getTypeInfo(const Type *T); 492 std::pair<uint64_t, unsigned> getTypeInfo(QualType T) { 493 return getTypeInfo(T.getTypePtr()); 494 } 495 496 /// getTypeSize - Return the size of the specified type, in bits. This method 497 /// does not work on incomplete types. 498 uint64_t getTypeSize(QualType T) { 499 return getTypeInfo(T).first; 500 } 501 uint64_t getTypeSize(const Type *T) { 502 return getTypeInfo(T).first; 503 } 504 505 /// getTypeAlign - Return the ABI-specified alignment of a type, in bits. 506 /// This method does not work on incomplete types. 507 unsigned getTypeAlign(QualType T) { 508 return getTypeInfo(T).second; 509 } 510 unsigned getTypeAlign(const Type *T) { 511 return getTypeInfo(T).second; 512 } 513 514 /// getPreferredTypeAlign - Return the "preferred" alignment of the specified 515 /// type for the current target in bits. This can be different than the ABI 516 /// alignment in cases where it is beneficial for performance to overalign 517 /// a data type. 518 unsigned getPreferredTypeAlign(const Type *T); 519 520 /// getDeclAlignInBytes - Return the alignment of the specified decl 521 /// that should be returned by __alignof(). Note that bitfields do 522 /// not have a valid alignment, so this method will assert on them. 523 unsigned getDeclAlignInBytes(const Decl *D); 524 525 /// getASTRecordLayout - Get or compute information about the layout of the 526 /// specified record (struct/union/class), which indicates its size and field 527 /// position information. 528 const ASTRecordLayout &getASTRecordLayout(const RecordDecl *D); 529 530 /// getASTObjCInterfaceLayout - Get or compute information about the 531 /// layout of the specified Objective-C interface. 532 const ASTRecordLayout &getASTObjCInterfaceLayout(const ObjCInterfaceDecl *D); 533 534 /// getASTObjCImplementationLayout - Get or compute information about 535 /// the layout of the specified Objective-C implementation. This may 536 /// differ from the interface if synthesized ivars are present. 537 const ASTRecordLayout & 538 getASTObjCImplementationLayout(const ObjCImplementationDecl *D); 539 540 void CollectObjCIvars(const ObjCInterfaceDecl *OI, 541 llvm::SmallVectorImpl<FieldDecl*> &Fields); 542 543 //===--------------------------------------------------------------------===// 544 // Type Operators 545 //===--------------------------------------------------------------------===// 546 547 /// getCanonicalType - Return the canonical (structural) type corresponding to 548 /// the specified potentially non-canonical type. The non-canonical version 549 /// of a type may have many "decorated" versions of types. Decorators can 550 /// include typedefs, 'typeof' operators, etc. The returned type is guaranteed 551 /// to be free of any of these, allowing two canonical types to be compared 552 /// for exact equality with a simple pointer comparison. 553 QualType getCanonicalType(QualType T); 554 const Type *getCanonicalType(const Type *T) { 555 return T->getCanonicalTypeInternal().getTypePtr(); 556 } 557 558 /// \brief Determine whether the given types are equivalent. 559 bool hasSameType(QualType T1, QualType T2) { 560 return getCanonicalType(T1) == getCanonicalType(T2); 561 } 562 563 /// \brief Determine whether the given types are equivalent after 564 /// cvr-qualifiers have been removed. 565 bool hasSameUnqualifiedType(QualType T1, QualType T2) { 566 T1 = getCanonicalType(T1); 567 T2 = getCanonicalType(T2); 568 return T1.getUnqualifiedType() == T2.getUnqualifiedType(); 569 } 570 571 /// \brief Retrieves the "canonical" declaration of the given tag 572 /// declaration. 573 /// 574 /// The canonical declaration for the given tag declaration is 575 /// either the definition of the tag (if it is a complete type) or 576 /// the first declaration of that tag. 577 TagDecl *getCanonicalDecl(TagDecl *Tag) { 578 QualType T = getTagDeclType(Tag); 579 return cast<TagDecl>(cast<TagType>(T.getTypePtr()->CanonicalType) 580 ->getDecl()); 581 } 582 583 /// \brief Retrieves the "canonical" nested name specifier for a 584 /// given nested name specifier. 585 /// 586 /// The canonical nested name specifier is a nested name specifier 587 /// that uniquely identifies a type or namespace within the type 588 /// system. For example, given: 589 /// 590 /// \code 591 /// namespace N { 592 /// struct S { 593 /// template<typename T> struct X { typename T* type; }; 594 /// }; 595 /// } 596 /// 597 /// template<typename T> struct Y { 598 /// typename N::S::X<T>::type member; 599 /// }; 600 /// \endcode 601 /// 602 /// Here, the nested-name-specifier for N::S::X<T>:: will be 603 /// S::X<template-param-0-0>, since 'S' and 'X' are uniquely defined 604 /// by declarations in the type system and the canonical type for 605 /// the template type parameter 'T' is template-param-0-0. 606 NestedNameSpecifier * 607 getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS); 608 609 /// Type Query functions. If the type is an instance of the specified class, 610 /// return the Type pointer for the underlying maximally pretty type. This 611 /// is a member of ASTContext because this may need to do some amount of 612 /// canonicalization, e.g. to move type qualifiers into the element type. 613 const ArrayType *getAsArrayType(QualType T); 614 const ConstantArrayType *getAsConstantArrayType(QualType T) { 615 return dyn_cast_or_null<ConstantArrayType>(getAsArrayType(T)); 616 } 617 const VariableArrayType *getAsVariableArrayType(QualType T) { 618 return dyn_cast_or_null<VariableArrayType>(getAsArrayType(T)); 619 } 620 const IncompleteArrayType *getAsIncompleteArrayType(QualType T) { 621 return dyn_cast_or_null<IncompleteArrayType>(getAsArrayType(T)); 622 } 623 624 /// getBaseElementType - Returns the innermost element type of a variable 625 /// length array type. For example, will return "int" for int[m][n] 626 QualType getBaseElementType(const VariableArrayType *VAT); 627 628 /// getArrayDecayedType - Return the properly qualified result of decaying the 629 /// specified array type to a pointer. This operation is non-trivial when 630 /// handling typedefs etc. The canonical type of "T" must be an array type, 631 /// this returns a pointer to a properly qualified element of the array. 632 /// 633 /// See C99 6.7.5.3p7 and C99 6.3.2.1p3. 634 QualType getArrayDecayedType(QualType T); 635 636 /// getIntegerTypeOrder - Returns the highest ranked integer type: 637 /// C99 6.3.1.8p1. If LHS > RHS, return 1. If LHS == RHS, return 0. If 638 /// LHS < RHS, return -1. 639 int getIntegerTypeOrder(QualType LHS, QualType RHS); 640 641 /// getFloatingTypeOrder - Compare the rank of the two specified floating 642 /// point types, ignoring the domain of the type (i.e. 'double' == 643 /// '_Complex double'). If LHS > RHS, return 1. If LHS == RHS, return 0. If 644 /// LHS < RHS, return -1. 645 int getFloatingTypeOrder(QualType LHS, QualType RHS); 646 647 /// getFloatingTypeOfSizeWithinDomain - Returns a real floating 648 /// point or a complex type (based on typeDomain/typeSize). 649 /// 'typeDomain' is a real floating point or complex type. 650 /// 'typeSize' is a real floating point or complex type. 651 QualType getFloatingTypeOfSizeWithinDomain(QualType typeSize, 652 QualType typeDomain) const; 653 654private: 655 // Helper for integer ordering 656 unsigned getIntegerRank(Type* T); 657 658public: 659 660 //===--------------------------------------------------------------------===// 661 // Type Compatibility Predicates 662 //===--------------------------------------------------------------------===// 663 664 /// Compatibility predicates used to check assignment expressions. 665 bool typesAreCompatible(QualType, QualType); // C99 6.2.7p1 666 bool typesAreBlockCompatible(QualType lhs, QualType rhs); 667 668 bool isObjCIdType(QualType T) const { 669 return T == ObjCIdType; 670 } 671 bool isObjCIdStructType(QualType T) const { 672 if (!IdStructType) // ObjC isn't enabled 673 return false; 674 return T->getAsStructureType() == IdStructType; 675 } 676 bool isObjCClassType(QualType T) const { 677 return T == ObjCClassType; 678 } 679 bool isObjCClassStructType(QualType T) const { 680 if (!ClassStructType) // ObjC isn't enabled 681 return false; 682 return T->getAsStructureType() == ClassStructType; 683 } 684 bool isObjCSelType(QualType T) const { 685 assert(SelStructType && "isObjCSelType used before 'SEL' type is built"); 686 return T->getAsStructureType() == SelStructType; 687 } 688 689 // Check the safety of assignment from LHS to RHS 690 bool canAssignObjCInterfaces(const ObjCInterfaceType *LHS, 691 const ObjCInterfaceType *RHS); 692 bool areComparableObjCPointerTypes(QualType LHS, QualType RHS); 693 694 // Functions for calculating composite types 695 QualType mergeTypes(QualType, QualType); 696 QualType mergeFunctionTypes(QualType, QualType); 697 698 //===--------------------------------------------------------------------===// 699 // Integer Predicates 700 //===--------------------------------------------------------------------===// 701 702 // The width of an integer, as defined in C99 6.2.6.2. This is the number 703 // of bits in an integer type excluding any padding bits. 704 unsigned getIntWidth(QualType T); 705 706 // Per C99 6.2.5p6, for every signed integer type, there is a corresponding 707 // unsigned integer type. This method takes a signed type, and returns the 708 // corresponding unsigned integer type. 709 QualType getCorrespondingUnsignedType(QualType T); 710 711 //===--------------------------------------------------------------------===// 712 // Type Iterators. 713 //===--------------------------------------------------------------------===// 714 715 typedef std::vector<Type*>::iterator type_iterator; 716 typedef std::vector<Type*>::const_iterator const_type_iterator; 717 718 type_iterator types_begin() { return Types.begin(); } 719 type_iterator types_end() { return Types.end(); } 720 const_type_iterator types_begin() const { return Types.begin(); } 721 const_type_iterator types_end() const { return Types.end(); } 722 723 //===--------------------------------------------------------------------===// 724 // Integer Values 725 //===--------------------------------------------------------------------===// 726 727 /// MakeIntValue - Make an APSInt of the appropriate width and 728 /// signedness for the given \arg Value and integer \arg Type. 729 llvm::APSInt MakeIntValue(uint64_t Value, QualType Type) { 730 llvm::APSInt Res(getIntWidth(Type), !Type->isSignedIntegerType()); 731 Res = Value; 732 return Res; 733 } 734 735private: 736 ASTContext(const ASTContext&); // DO NOT IMPLEMENT 737 void operator=(const ASTContext&); // DO NOT IMPLEMENT 738 739 void InitBuiltinTypes(); 740 void InitBuiltinType(QualType &R, BuiltinType::Kind K); 741 742 // Return the ObjC type encoding for a given type. 743 void getObjCEncodingForTypeImpl(QualType t, std::string &S, 744 bool ExpandPointedToStructures, 745 bool ExpandStructures, 746 const FieldDecl *Field, 747 bool OutermostType = false, 748 bool EncodingProperty = false); 749 750 const ASTRecordLayout &getObjCLayout(const ObjCInterfaceDecl *D, 751 const ObjCImplementationDecl *Impl); 752}; 753 754} // end namespace clang 755 756// operator new and delete aren't allowed inside namespaces. 757// The throw specifications are mandated by the standard. 758/// @brief Placement new for using the ASTContext's allocator. 759/// 760/// This placement form of operator new uses the ASTContext's allocator for 761/// obtaining memory. It is a non-throwing new, which means that it returns 762/// null on error. (If that is what the allocator does. The current does, so if 763/// this ever changes, this operator will have to be changed, too.) 764/// Usage looks like this (assuming there's an ASTContext 'Context' in scope): 765/// @code 766/// // Default alignment (16) 767/// IntegerLiteral *Ex = new (Context) IntegerLiteral(arguments); 768/// // Specific alignment 769/// IntegerLiteral *Ex2 = new (Context, 8) IntegerLiteral(arguments); 770/// @endcode 771/// Please note that you cannot use delete on the pointer; it must be 772/// deallocated using an explicit destructor call followed by 773/// @c Context.Deallocate(Ptr). 774/// 775/// @param Bytes The number of bytes to allocate. Calculated by the compiler. 776/// @param C The ASTContext that provides the allocator. 777/// @param Alignment The alignment of the allocated memory (if the underlying 778/// allocator supports it). 779/// @return The allocated memory. Could be NULL. 780inline void *operator new(size_t Bytes, clang::ASTContext &C, 781 size_t Alignment) throw () { 782 return C.Allocate(Bytes, Alignment); 783} 784/// @brief Placement delete companion to the new above. 785/// 786/// This operator is just a companion to the new above. There is no way of 787/// invoking it directly; see the new operator for more details. This operator 788/// is called implicitly by the compiler if a placement new expression using 789/// the ASTContext throws in the object constructor. 790inline void operator delete(void *Ptr, clang::ASTContext &C, size_t) 791 throw () { 792 C.Deallocate(Ptr); 793} 794 795/// This placement form of operator new[] uses the ASTContext's allocator for 796/// obtaining memory. It is a non-throwing new[], which means that it returns 797/// null on error. 798/// Usage looks like this (assuming there's an ASTContext 'Context' in scope): 799/// @code 800/// // Default alignment (16) 801/// char *data = new (Context) char[10]; 802/// // Specific alignment 803/// char *data = new (Context, 8) char[10]; 804/// @endcode 805/// Please note that you cannot use delete on the pointer; it must be 806/// deallocated using an explicit destructor call followed by 807/// @c Context.Deallocate(Ptr). 808/// 809/// @param Bytes The number of bytes to allocate. Calculated by the compiler. 810/// @param C The ASTContext that provides the allocator. 811/// @param Alignment The alignment of the allocated memory (if the underlying 812/// allocator supports it). 813/// @return The allocated memory. Could be NULL. 814inline void *operator new[](size_t Bytes, clang::ASTContext& C, 815 size_t Alignment = 16) throw () { 816 return C.Allocate(Bytes, Alignment); 817} 818 819/// @brief Placement delete[] companion to the new[] above. 820/// 821/// This operator is just a companion to the new[] above. There is no way of 822/// invoking it directly; see the new[] operator for more details. This operator 823/// is called implicitly by the compiler if a placement new[] expression using 824/// the ASTContext throws in the object constructor. 825inline void operator delete[](void *Ptr, clang::ASTContext &C) throw () { 826 C.Deallocate(Ptr); 827} 828 829#endif 830