Type.h revision 32509f1e60451d86e9fbc473b6e853ba10b5fd1e
1//===--- Type.h - C Language Family Type Representation ---------*- 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 Type interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_TYPE_H 15#define LLVM_CLANG_AST_TYPE_H 16 17#include "clang/Basic/Diagnostic.h" 18#include "clang/Basic/ExceptionSpecificationType.h" 19#include "clang/Basic/IdentifierTable.h" 20#include "clang/Basic/Linkage.h" 21#include "clang/Basic/PartialDiagnostic.h" 22#include "clang/Basic/Visibility.h" 23#include "clang/AST/NestedNameSpecifier.h" 24#include "clang/AST/TemplateName.h" 25#include "llvm/Support/type_traits.h" 26#include "llvm/Support/ErrorHandling.h" 27#include "llvm/ADT/APSInt.h" 28#include "llvm/ADT/FoldingSet.h" 29#include "llvm/ADT/Optional.h" 30#include "llvm/ADT/PointerIntPair.h" 31#include "llvm/ADT/PointerUnion.h" 32#include "clang/Basic/LLVM.h" 33 34namespace clang { 35 enum { 36 TypeAlignmentInBits = 4, 37 TypeAlignment = 1 << TypeAlignmentInBits 38 }; 39 class Type; 40 class ExtQuals; 41 class QualType; 42} 43 44namespace llvm { 45 template <typename T> 46 class PointerLikeTypeTraits; 47 template<> 48 class PointerLikeTypeTraits< ::clang::Type*> { 49 public: 50 static inline void *getAsVoidPointer(::clang::Type *P) { return P; } 51 static inline ::clang::Type *getFromVoidPointer(void *P) { 52 return static_cast< ::clang::Type*>(P); 53 } 54 enum { NumLowBitsAvailable = clang::TypeAlignmentInBits }; 55 }; 56 template<> 57 class PointerLikeTypeTraits< ::clang::ExtQuals*> { 58 public: 59 static inline void *getAsVoidPointer(::clang::ExtQuals *P) { return P; } 60 static inline ::clang::ExtQuals *getFromVoidPointer(void *P) { 61 return static_cast< ::clang::ExtQuals*>(P); 62 } 63 enum { NumLowBitsAvailable = clang::TypeAlignmentInBits }; 64 }; 65 66 template <> 67 struct isPodLike<clang::QualType> { static const bool value = true; }; 68} 69 70namespace clang { 71 class ASTContext; 72 class TypedefNameDecl; 73 class TemplateDecl; 74 class TemplateTypeParmDecl; 75 class NonTypeTemplateParmDecl; 76 class TemplateTemplateParmDecl; 77 class TagDecl; 78 class RecordDecl; 79 class CXXRecordDecl; 80 class EnumDecl; 81 class FieldDecl; 82 class ObjCInterfaceDecl; 83 class ObjCProtocolDecl; 84 class ObjCMethodDecl; 85 class UnresolvedUsingTypenameDecl; 86 class Expr; 87 class Stmt; 88 class SourceLocation; 89 class StmtIteratorBase; 90 class TemplateArgument; 91 class TemplateArgumentLoc; 92 class TemplateArgumentListInfo; 93 class ElaboratedType; 94 class ExtQuals; 95 class ExtQualsTypeCommonBase; 96 struct PrintingPolicy; 97 98 template <typename> class CanQual; 99 typedef CanQual<Type> CanQualType; 100 101 // Provide forward declarations for all of the *Type classes 102#define TYPE(Class, Base) class Class##Type; 103#include "clang/AST/TypeNodes.def" 104 105/// Qualifiers - The collection of all-type qualifiers we support. 106/// Clang supports five independent qualifiers: 107/// * C99: const, volatile, and restrict 108/// * Embedded C (TR18037): address spaces 109/// * Objective C: the GC attributes (none, weak, or strong) 110class Qualifiers { 111public: 112 enum TQ { // NOTE: These flags must be kept in sync with DeclSpec::TQ. 113 Const = 0x1, 114 Restrict = 0x2, 115 Volatile = 0x4, 116 CVRMask = Const | Volatile | Restrict 117 }; 118 119 enum GC { 120 GCNone = 0, 121 Weak, 122 Strong 123 }; 124 125 enum ObjCLifetime { 126 /// There is no lifetime qualification on this type. 127 OCL_None, 128 129 /// This object can be modified without requiring retains or 130 /// releases. 131 OCL_ExplicitNone, 132 133 /// Assigning into this object requires the old value to be 134 /// released and the new value to be retained. The timing of the 135 /// release of the old value is inexact: it may be moved to 136 /// immediately after the last known point where the value is 137 /// live. 138 OCL_Strong, 139 140 /// Reading or writing from this object requires a barrier call. 141 OCL_Weak, 142 143 /// Assigning into this object requires a lifetime extension. 144 OCL_Autoreleasing 145 }; 146 147 enum { 148 /// The maximum supported address space number. 149 /// 24 bits should be enough for anyone. 150 MaxAddressSpace = 0xffffffu, 151 152 /// The width of the "fast" qualifier mask. 153 FastWidth = 3, 154 155 /// The fast qualifier mask. 156 FastMask = (1 << FastWidth) - 1 157 }; 158 159 Qualifiers() : Mask(0) {} 160 161 static Qualifiers fromFastMask(unsigned Mask) { 162 Qualifiers Qs; 163 Qs.addFastQualifiers(Mask); 164 return Qs; 165 } 166 167 static Qualifiers fromCVRMask(unsigned CVR) { 168 Qualifiers Qs; 169 Qs.addCVRQualifiers(CVR); 170 return Qs; 171 } 172 173 // Deserialize qualifiers from an opaque representation. 174 static Qualifiers fromOpaqueValue(unsigned opaque) { 175 Qualifiers Qs; 176 Qs.Mask = opaque; 177 return Qs; 178 } 179 180 // Serialize these qualifiers into an opaque representation. 181 unsigned getAsOpaqueValue() const { 182 return Mask; 183 } 184 185 bool hasConst() const { return Mask & Const; } 186 void setConst(bool flag) { 187 Mask = (Mask & ~Const) | (flag ? Const : 0); 188 } 189 void removeConst() { Mask &= ~Const; } 190 void addConst() { Mask |= Const; } 191 192 bool hasVolatile() const { return Mask & Volatile; } 193 void setVolatile(bool flag) { 194 Mask = (Mask & ~Volatile) | (flag ? Volatile : 0); 195 } 196 void removeVolatile() { Mask &= ~Volatile; } 197 void addVolatile() { Mask |= Volatile; } 198 199 bool hasRestrict() const { return Mask & Restrict; } 200 void setRestrict(bool flag) { 201 Mask = (Mask & ~Restrict) | (flag ? Restrict : 0); 202 } 203 void removeRestrict() { Mask &= ~Restrict; } 204 void addRestrict() { Mask |= Restrict; } 205 206 bool hasCVRQualifiers() const { return getCVRQualifiers(); } 207 unsigned getCVRQualifiers() const { return Mask & CVRMask; } 208 void setCVRQualifiers(unsigned mask) { 209 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits"); 210 Mask = (Mask & ~CVRMask) | mask; 211 } 212 void removeCVRQualifiers(unsigned mask) { 213 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits"); 214 Mask &= ~mask; 215 } 216 void removeCVRQualifiers() { 217 removeCVRQualifiers(CVRMask); 218 } 219 void addCVRQualifiers(unsigned mask) { 220 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits"); 221 Mask |= mask; 222 } 223 224 bool hasObjCGCAttr() const { return Mask & GCAttrMask; } 225 GC getObjCGCAttr() const { return GC((Mask & GCAttrMask) >> GCAttrShift); } 226 void setObjCGCAttr(GC type) { 227 Mask = (Mask & ~GCAttrMask) | (type << GCAttrShift); 228 } 229 void removeObjCGCAttr() { setObjCGCAttr(GCNone); } 230 void addObjCGCAttr(GC type) { 231 assert(type); 232 setObjCGCAttr(type); 233 } 234 Qualifiers withoutObjCGCAttr() const { 235 Qualifiers qs = *this; 236 qs.removeObjCGCAttr(); 237 return qs; 238 } 239 Qualifiers withoutObjCGLifetime() const { 240 Qualifiers qs = *this; 241 qs.removeObjCLifetime(); 242 return qs; 243 } 244 245 bool hasObjCLifetime() const { return Mask & LifetimeMask; } 246 ObjCLifetime getObjCLifetime() const { 247 return ObjCLifetime((Mask & LifetimeMask) >> LifetimeShift); 248 } 249 void setObjCLifetime(ObjCLifetime type) { 250 Mask = (Mask & ~LifetimeMask) | (type << LifetimeShift); 251 } 252 void removeObjCLifetime() { setObjCLifetime(OCL_None); } 253 void addObjCLifetime(ObjCLifetime type) { 254 assert(type); 255 setObjCLifetime(type); 256 } 257 258 /// True if the lifetime is neither None or ExplicitNone. 259 bool hasNonTrivialObjCLifetime() const { 260 ObjCLifetime lifetime = getObjCLifetime(); 261 return (lifetime > OCL_ExplicitNone); 262 } 263 264 /// True if the lifetime is either strong or weak. 265 bool hasStrongOrWeakObjCLifetime() const { 266 ObjCLifetime lifetime = getObjCLifetime(); 267 return (lifetime == OCL_Strong || lifetime == OCL_Weak); 268 } 269 270 bool hasAddressSpace() const { return Mask & AddressSpaceMask; } 271 unsigned getAddressSpace() const { return Mask >> AddressSpaceShift; } 272 void setAddressSpace(unsigned space) { 273 assert(space <= MaxAddressSpace); 274 Mask = (Mask & ~AddressSpaceMask) 275 | (((uint32_t) space) << AddressSpaceShift); 276 } 277 void removeAddressSpace() { setAddressSpace(0); } 278 void addAddressSpace(unsigned space) { 279 assert(space); 280 setAddressSpace(space); 281 } 282 283 // Fast qualifiers are those that can be allocated directly 284 // on a QualType object. 285 bool hasFastQualifiers() const { return getFastQualifiers(); } 286 unsigned getFastQualifiers() const { return Mask & FastMask; } 287 void setFastQualifiers(unsigned mask) { 288 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"); 289 Mask = (Mask & ~FastMask) | mask; 290 } 291 void removeFastQualifiers(unsigned mask) { 292 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"); 293 Mask &= ~mask; 294 } 295 void removeFastQualifiers() { 296 removeFastQualifiers(FastMask); 297 } 298 void addFastQualifiers(unsigned mask) { 299 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"); 300 Mask |= mask; 301 } 302 303 /// hasNonFastQualifiers - Return true if the set contains any 304 /// qualifiers which require an ExtQuals node to be allocated. 305 bool hasNonFastQualifiers() const { return Mask & ~FastMask; } 306 Qualifiers getNonFastQualifiers() const { 307 Qualifiers Quals = *this; 308 Quals.setFastQualifiers(0); 309 return Quals; 310 } 311 312 /// hasQualifiers - Return true if the set contains any qualifiers. 313 bool hasQualifiers() const { return Mask; } 314 bool empty() const { return !Mask; } 315 316 /// \brief Add the qualifiers from the given set to this set. 317 void addQualifiers(Qualifiers Q) { 318 // If the other set doesn't have any non-boolean qualifiers, just 319 // bit-or it in. 320 if (!(Q.Mask & ~CVRMask)) 321 Mask |= Q.Mask; 322 else { 323 Mask |= (Q.Mask & CVRMask); 324 if (Q.hasAddressSpace()) 325 addAddressSpace(Q.getAddressSpace()); 326 if (Q.hasObjCGCAttr()) 327 addObjCGCAttr(Q.getObjCGCAttr()); 328 if (Q.hasObjCLifetime()) 329 addObjCLifetime(Q.getObjCLifetime()); 330 } 331 } 332 333 /// \brief Add the qualifiers from the given set to this set, given that 334 /// they don't conflict. 335 void addConsistentQualifiers(Qualifiers qs) { 336 assert(getAddressSpace() == qs.getAddressSpace() || 337 !hasAddressSpace() || !qs.hasAddressSpace()); 338 assert(getObjCGCAttr() == qs.getObjCGCAttr() || 339 !hasObjCGCAttr() || !qs.hasObjCGCAttr()); 340 assert(getObjCLifetime() == qs.getObjCLifetime() || 341 !hasObjCLifetime() || !qs.hasObjCLifetime()); 342 Mask |= qs.Mask; 343 } 344 345 /// \brief Determines if these qualifiers compatibly include another set. 346 /// Generally this answers the question of whether an object with the other 347 /// qualifiers can be safely used as an object with these qualifiers. 348 bool compatiblyIncludes(Qualifiers other) const { 349 return 350 // Address spaces must match exactly. 351 getAddressSpace() == other.getAddressSpace() && 352 // ObjC GC qualifiers can match, be added, or be removed, but can't be 353 // changed. 354 (getObjCGCAttr() == other.getObjCGCAttr() || 355 !hasObjCGCAttr() || !other.hasObjCGCAttr()) && 356 // ObjC lifetime qualifiers must match exactly. 357 getObjCLifetime() == other.getObjCLifetime() && 358 // CVR qualifiers may subset. 359 (((Mask & CVRMask) | (other.Mask & CVRMask)) == (Mask & CVRMask)); 360 } 361 362 /// \brief Determines if these qualifiers compatibly include another set of 363 /// qualifiers from the narrow perspective of Objective-C ARC lifetime. 364 /// 365 /// One set of Objective-C lifetime qualifiers compatibly includes the other 366 /// if the lifetime qualifiers match, or if both are non-__weak and the 367 /// including set also contains the 'const' qualifier. 368 bool compatiblyIncludesObjCLifetime(Qualifiers other) const { 369 if (getObjCLifetime() == other.getObjCLifetime()) 370 return true; 371 372 if (getObjCLifetime() == OCL_Weak || other.getObjCLifetime() == OCL_Weak) 373 return false; 374 375 return hasConst(); 376 } 377 378 bool isSupersetOf(Qualifiers Other) const; 379 380 /// \brief Determine whether this set of qualifiers is a strict superset of 381 /// another set of qualifiers, not considering qualifier compatibility. 382 bool isStrictSupersetOf(Qualifiers Other) const; 383 384 bool operator==(Qualifiers Other) const { return Mask == Other.Mask; } 385 bool operator!=(Qualifiers Other) const { return Mask != Other.Mask; } 386 387 operator bool() const { return hasQualifiers(); } 388 389 Qualifiers &operator+=(Qualifiers R) { 390 addQualifiers(R); 391 return *this; 392 } 393 394 // Union two qualifier sets. If an enumerated qualifier appears 395 // in both sets, use the one from the right. 396 friend Qualifiers operator+(Qualifiers L, Qualifiers R) { 397 L += R; 398 return L; 399 } 400 401 Qualifiers &operator-=(Qualifiers R) { 402 Mask = Mask & ~(R.Mask); 403 return *this; 404 } 405 406 /// \brief Compute the difference between two qualifier sets. 407 friend Qualifiers operator-(Qualifiers L, Qualifiers R) { 408 L -= R; 409 return L; 410 } 411 412 std::string getAsString() const; 413 std::string getAsString(const PrintingPolicy &Policy) const { 414 std::string Buffer; 415 getAsStringInternal(Buffer, Policy); 416 return Buffer; 417 } 418 void getAsStringInternal(std::string &S, const PrintingPolicy &Policy) const; 419 420 void Profile(llvm::FoldingSetNodeID &ID) const { 421 ID.AddInteger(Mask); 422 } 423 424private: 425 426 // bits: |0 1 2|3 .. 4|5 .. 7|8 ... 31| 427 // |C R V|GCAttr|Lifetime|AddressSpace| 428 uint32_t Mask; 429 430 static const uint32_t GCAttrMask = 0x18; 431 static const uint32_t GCAttrShift = 3; 432 static const uint32_t LifetimeMask = 0xE0; 433 static const uint32_t LifetimeShift = 5; 434 static const uint32_t AddressSpaceMask = ~(CVRMask|GCAttrMask|LifetimeMask); 435 static const uint32_t AddressSpaceShift = 8; 436}; 437 438/// CallingConv - Specifies the calling convention that a function uses. 439enum CallingConv { 440 CC_Default, 441 CC_C, // __attribute__((cdecl)) 442 CC_X86StdCall, // __attribute__((stdcall)) 443 CC_X86FastCall, // __attribute__((fastcall)) 444 CC_X86ThisCall, // __attribute__((thiscall)) 445 CC_X86Pascal, // __attribute__((pascal)) 446 CC_AAPCS, // __attribute__((pcs("aapcs"))) 447 CC_AAPCS_VFP // __attribute__((pcs("aapcs-vfp"))) 448}; 449 450typedef std::pair<const Type*, Qualifiers> SplitQualType; 451 452/// QualType - For efficiency, we don't store CV-qualified types as nodes on 453/// their own: instead each reference to a type stores the qualifiers. This 454/// greatly reduces the number of nodes we need to allocate for types (for 455/// example we only need one for 'int', 'const int', 'volatile int', 456/// 'const volatile int', etc). 457/// 458/// As an added efficiency bonus, instead of making this a pair, we 459/// just store the two bits we care about in the low bits of the 460/// pointer. To handle the packing/unpacking, we make QualType be a 461/// simple wrapper class that acts like a smart pointer. A third bit 462/// indicates whether there are extended qualifiers present, in which 463/// case the pointer points to a special structure. 464class QualType { 465 // Thankfully, these are efficiently composable. 466 llvm::PointerIntPair<llvm::PointerUnion<const Type*,const ExtQuals*>, 467 Qualifiers::FastWidth> Value; 468 469 const ExtQuals *getExtQualsUnsafe() const { 470 return Value.getPointer().get<const ExtQuals*>(); 471 } 472 473 const Type *getTypePtrUnsafe() const { 474 return Value.getPointer().get<const Type*>(); 475 } 476 477 const ExtQualsTypeCommonBase *getCommonPtr() const { 478 assert(!isNull() && "Cannot retrieve a NULL type pointer"); 479 uintptr_t CommonPtrVal 480 = reinterpret_cast<uintptr_t>(Value.getOpaqueValue()); 481 CommonPtrVal &= ~(uintptr_t)((1 << TypeAlignmentInBits) - 1); 482 return reinterpret_cast<ExtQualsTypeCommonBase*>(CommonPtrVal); 483 } 484 485 friend class QualifierCollector; 486public: 487 QualType() {} 488 489 QualType(const Type *Ptr, unsigned Quals) 490 : Value(Ptr, Quals) {} 491 QualType(const ExtQuals *Ptr, unsigned Quals) 492 : Value(Ptr, Quals) {} 493 494 unsigned getLocalFastQualifiers() const { return Value.getInt(); } 495 void setLocalFastQualifiers(unsigned Quals) { Value.setInt(Quals); } 496 497 /// Retrieves a pointer to the underlying (unqualified) type. 498 /// This should really return a const Type, but it's not worth 499 /// changing all the users right now. 500 /// 501 /// This function requires that the type not be NULL. If the type might be 502 /// NULL, use the (slightly less efficient) \c getTypePtrOrNull(). 503 const Type *getTypePtr() const; 504 505 const Type *getTypePtrOrNull() const; 506 507 /// Retrieves a pointer to the name of the base type. 508 const IdentifierInfo *getBaseTypeIdentifier() const; 509 510 /// Divides a QualType into its unqualified type and a set of local 511 /// qualifiers. 512 SplitQualType split() const; 513 514 void *getAsOpaquePtr() const { return Value.getOpaqueValue(); } 515 static QualType getFromOpaquePtr(const void *Ptr) { 516 QualType T; 517 T.Value.setFromOpaqueValue(const_cast<void*>(Ptr)); 518 return T; 519 } 520 521 const Type &operator*() const { 522 return *getTypePtr(); 523 } 524 525 const Type *operator->() const { 526 return getTypePtr(); 527 } 528 529 bool isCanonical() const; 530 bool isCanonicalAsParam() const; 531 532 /// isNull - Return true if this QualType doesn't point to a type yet. 533 bool isNull() const { 534 return Value.getPointer().isNull(); 535 } 536 537 /// \brief Determine whether this particular QualType instance has the 538 /// "const" qualifier set, without looking through typedefs that may have 539 /// added "const" at a different level. 540 bool isLocalConstQualified() const { 541 return (getLocalFastQualifiers() & Qualifiers::Const); 542 } 543 544 /// \brief Determine whether this type is const-qualified. 545 bool isConstQualified() const; 546 547 /// \brief Determine whether this particular QualType instance has the 548 /// "restrict" qualifier set, without looking through typedefs that may have 549 /// added "restrict" at a different level. 550 bool isLocalRestrictQualified() const { 551 return (getLocalFastQualifiers() & Qualifiers::Restrict); 552 } 553 554 /// \brief Determine whether this type is restrict-qualified. 555 bool isRestrictQualified() const; 556 557 /// \brief Determine whether this particular QualType instance has the 558 /// "volatile" qualifier set, without looking through typedefs that may have 559 /// added "volatile" at a different level. 560 bool isLocalVolatileQualified() const { 561 return (getLocalFastQualifiers() & Qualifiers::Volatile); 562 } 563 564 /// \brief Determine whether this type is volatile-qualified. 565 bool isVolatileQualified() const; 566 567 /// \brief Determine whether this particular QualType instance has any 568 /// qualifiers, without looking through any typedefs that might add 569 /// qualifiers at a different level. 570 bool hasLocalQualifiers() const { 571 return getLocalFastQualifiers() || hasLocalNonFastQualifiers(); 572 } 573 574 /// \brief Determine whether this type has any qualifiers. 575 bool hasQualifiers() const; 576 577 /// \brief Determine whether this particular QualType instance has any 578 /// "non-fast" qualifiers, e.g., those that are stored in an ExtQualType 579 /// instance. 580 bool hasLocalNonFastQualifiers() const { 581 return Value.getPointer().is<const ExtQuals*>(); 582 } 583 584 /// \brief Retrieve the set of qualifiers local to this particular QualType 585 /// instance, not including any qualifiers acquired through typedefs or 586 /// other sugar. 587 Qualifiers getLocalQualifiers() const; 588 589 /// \brief Retrieve the set of qualifiers applied to this type. 590 Qualifiers getQualifiers() const; 591 592 /// \brief Retrieve the set of CVR (const-volatile-restrict) qualifiers 593 /// local to this particular QualType instance, not including any qualifiers 594 /// acquired through typedefs or other sugar. 595 unsigned getLocalCVRQualifiers() const { 596 return getLocalFastQualifiers(); 597 } 598 599 /// \brief Retrieve the set of CVR (const-volatile-restrict) qualifiers 600 /// applied to this type. 601 unsigned getCVRQualifiers() const; 602 603 bool isConstant(ASTContext& Ctx) const { 604 return QualType::isConstant(*this, Ctx); 605 } 606 607 /// \brief Determine whether this is a Plain Old Data (POD) type (C++ 3.9p10). 608 bool isPODType(ASTContext &Context) const; 609 610 /// isCXX11PODType() - Return true if this is a POD type according to the 611 /// more relaxed rules of the C++11 standard, regardless of the current 612 /// compilation's language. 613 /// (C++0x [basic.types]p9) 614 bool isCXX11PODType(ASTContext &Context) const; 615 616 /// isTrivialType - Return true if this is a trivial type 617 /// (C++0x [basic.types]p9) 618 bool isTrivialType(ASTContext &Context) const; 619 620 /// isTriviallyCopyableType - Return true if this is a trivially 621 /// copyable type (C++0x [basic.types]p9) 622 bool isTriviallyCopyableType(ASTContext &Context) const; 623 624 // Don't promise in the API that anything besides 'const' can be 625 // easily added. 626 627 /// addConst - add the specified type qualifier to this QualType. 628 void addConst() { 629 addFastQualifiers(Qualifiers::Const); 630 } 631 QualType withConst() const { 632 return withFastQualifiers(Qualifiers::Const); 633 } 634 635 /// addVolatile - add the specified type qualifier to this QualType. 636 void addVolatile() { 637 addFastQualifiers(Qualifiers::Volatile); 638 } 639 QualType withVolatile() const { 640 return withFastQualifiers(Qualifiers::Volatile); 641 } 642 643 QualType withCVRQualifiers(unsigned CVR) const { 644 return withFastQualifiers(CVR); 645 } 646 647 void addFastQualifiers(unsigned TQs) { 648 assert(!(TQs & ~Qualifiers::FastMask) 649 && "non-fast qualifier bits set in mask!"); 650 Value.setInt(Value.getInt() | TQs); 651 } 652 653 void removeLocalConst(); 654 void removeLocalVolatile(); 655 void removeLocalRestrict(); 656 void removeLocalCVRQualifiers(unsigned Mask); 657 658 void removeLocalFastQualifiers() { Value.setInt(0); } 659 void removeLocalFastQualifiers(unsigned Mask) { 660 assert(!(Mask & ~Qualifiers::FastMask) && "mask has non-fast qualifiers"); 661 Value.setInt(Value.getInt() & ~Mask); 662 } 663 664 // Creates a type with the given qualifiers in addition to any 665 // qualifiers already on this type. 666 QualType withFastQualifiers(unsigned TQs) const { 667 QualType T = *this; 668 T.addFastQualifiers(TQs); 669 return T; 670 } 671 672 // Creates a type with exactly the given fast qualifiers, removing 673 // any existing fast qualifiers. 674 QualType withExactLocalFastQualifiers(unsigned TQs) const { 675 return withoutLocalFastQualifiers().withFastQualifiers(TQs); 676 } 677 678 // Removes fast qualifiers, but leaves any extended qualifiers in place. 679 QualType withoutLocalFastQualifiers() const { 680 QualType T = *this; 681 T.removeLocalFastQualifiers(); 682 return T; 683 } 684 685 QualType getCanonicalType() const; 686 687 /// \brief Return this type with all of the instance-specific qualifiers 688 /// removed, but without removing any qualifiers that may have been applied 689 /// through typedefs. 690 QualType getLocalUnqualifiedType() const { return QualType(getTypePtr(), 0); } 691 692 /// \brief Retrieve the unqualified variant of the given type, 693 /// removing as little sugar as possible. 694 /// 695 /// This routine looks through various kinds of sugar to find the 696 /// least-desugared type that is unqualified. For example, given: 697 /// 698 /// \code 699 /// typedef int Integer; 700 /// typedef const Integer CInteger; 701 /// typedef CInteger DifferenceType; 702 /// \endcode 703 /// 704 /// Executing \c getUnqualifiedType() on the type \c DifferenceType will 705 /// desugar until we hit the type \c Integer, which has no qualifiers on it. 706 /// 707 /// The resulting type might still be qualified if it's an array 708 /// type. To strip qualifiers even from within an array type, use 709 /// ASTContext::getUnqualifiedArrayType. 710 inline QualType getUnqualifiedType() const; 711 712 /// getSplitUnqualifiedType - Retrieve the unqualified variant of the 713 /// given type, removing as little sugar as possible. 714 /// 715 /// Like getUnqualifiedType(), but also returns the set of 716 /// qualifiers that were built up. 717 /// 718 /// The resulting type might still be qualified if it's an array 719 /// type. To strip qualifiers even from within an array type, use 720 /// ASTContext::getUnqualifiedArrayType. 721 inline SplitQualType getSplitUnqualifiedType() const; 722 723 /// \brief Determine whether this type is more qualified than the other 724 /// given type, requiring exact equality for non-CVR qualifiers. 725 bool isMoreQualifiedThan(QualType Other) const; 726 727 /// \brief Determine whether this type is at least as qualified as the other 728 /// given type, requiring exact equality for non-CVR qualifiers. 729 bool isAtLeastAsQualifiedAs(QualType Other) const; 730 731 QualType getNonReferenceType() const; 732 733 /// \brief Determine the type of a (typically non-lvalue) expression with the 734 /// specified result type. 735 /// 736 /// This routine should be used for expressions for which the return type is 737 /// explicitly specified (e.g., in a cast or call) and isn't necessarily 738 /// an lvalue. It removes a top-level reference (since there are no 739 /// expressions of reference type) and deletes top-level cvr-qualifiers 740 /// from non-class types (in C++) or all types (in C). 741 QualType getNonLValueExprType(ASTContext &Context) const; 742 743 /// getDesugaredType - Return the specified type with any "sugar" removed from 744 /// the type. This takes off typedefs, typeof's etc. If the outer level of 745 /// the type is already concrete, it returns it unmodified. This is similar 746 /// to getting the canonical type, but it doesn't remove *all* typedefs. For 747 /// example, it returns "T*" as "T*", (not as "int*"), because the pointer is 748 /// concrete. 749 /// 750 /// Qualifiers are left in place. 751 QualType getDesugaredType(const ASTContext &Context) const { 752 return getDesugaredType(*this, Context); 753 } 754 755 SplitQualType getSplitDesugaredType() const { 756 return getSplitDesugaredType(*this); 757 } 758 759 /// \brief Return the specified type with one level of "sugar" removed from 760 /// the type. 761 /// 762 /// This routine takes off the first typedef, typeof, etc. If the outer level 763 /// of the type is already concrete, it returns it unmodified. 764 QualType getSingleStepDesugaredType(const ASTContext &Context) const; 765 766 /// IgnoreParens - Returns the specified type after dropping any 767 /// outer-level parentheses. 768 QualType IgnoreParens() const { 769 if (isa<ParenType>(*this)) 770 return QualType::IgnoreParens(*this); 771 return *this; 772 } 773 774 /// operator==/!= - Indicate whether the specified types and qualifiers are 775 /// identical. 776 friend bool operator==(const QualType &LHS, const QualType &RHS) { 777 return LHS.Value == RHS.Value; 778 } 779 friend bool operator!=(const QualType &LHS, const QualType &RHS) { 780 return LHS.Value != RHS.Value; 781 } 782 std::string getAsString() const { 783 return getAsString(split()); 784 } 785 static std::string getAsString(SplitQualType split) { 786 return getAsString(split.first, split.second); 787 } 788 static std::string getAsString(const Type *ty, Qualifiers qs); 789 790 std::string getAsString(const PrintingPolicy &Policy) const { 791 std::string S; 792 getAsStringInternal(S, Policy); 793 return S; 794 } 795 void getAsStringInternal(std::string &Str, 796 const PrintingPolicy &Policy) const { 797 return getAsStringInternal(split(), Str, Policy); 798 } 799 static void getAsStringInternal(SplitQualType split, std::string &out, 800 const PrintingPolicy &policy) { 801 return getAsStringInternal(split.first, split.second, out, policy); 802 } 803 static void getAsStringInternal(const Type *ty, Qualifiers qs, 804 std::string &out, 805 const PrintingPolicy &policy); 806 807 void dump(const char *s) const; 808 void dump() const; 809 810 void Profile(llvm::FoldingSetNodeID &ID) const { 811 ID.AddPointer(getAsOpaquePtr()); 812 } 813 814 /// getAddressSpace - Return the address space of this type. 815 inline unsigned getAddressSpace() const; 816 817 /// getObjCGCAttr - Returns gc attribute of this type. 818 inline Qualifiers::GC getObjCGCAttr() const; 819 820 /// isObjCGCWeak true when Type is objc's weak. 821 bool isObjCGCWeak() const { 822 return getObjCGCAttr() == Qualifiers::Weak; 823 } 824 825 /// isObjCGCStrong true when Type is objc's strong. 826 bool isObjCGCStrong() const { 827 return getObjCGCAttr() == Qualifiers::Strong; 828 } 829 830 /// getObjCLifetime - Returns lifetime attribute of this type. 831 Qualifiers::ObjCLifetime getObjCLifetime() const { 832 return getQualifiers().getObjCLifetime(); 833 } 834 835 bool hasNonTrivialObjCLifetime() const { 836 return getQualifiers().hasNonTrivialObjCLifetime(); 837 } 838 839 bool hasStrongOrWeakObjCLifetime() const { 840 return getQualifiers().hasStrongOrWeakObjCLifetime(); 841 } 842 843 enum DestructionKind { 844 DK_none, 845 DK_cxx_destructor, 846 DK_objc_strong_lifetime, 847 DK_objc_weak_lifetime 848 }; 849 850 /// isDestructedType - nonzero if objects of this type require 851 /// non-trivial work to clean up after. Non-zero because it's 852 /// conceivable that qualifiers (objc_gc(weak)?) could make 853 /// something require destruction. 854 DestructionKind isDestructedType() const { 855 return isDestructedTypeImpl(*this); 856 } 857 858 /// \brief Determine whether expressions of the given type are forbidden 859 /// from being lvalues in C. 860 /// 861 /// The expression types that are forbidden to be lvalues are: 862 /// - 'void', but not qualified void 863 /// - function types 864 /// 865 /// The exact rule here is C99 6.3.2.1: 866 /// An lvalue is an expression with an object type or an incomplete 867 /// type other than void. 868 bool isCForbiddenLValueType() const; 869 870 /// \brief Determine whether this type has trivial copy/move-assignment 871 /// semantics. 872 bool hasTrivialAssignment(ASTContext &Context, bool Copying) const; 873 874private: 875 // These methods are implemented in a separate translation unit; 876 // "static"-ize them to avoid creating temporary QualTypes in the 877 // caller. 878 static bool isConstant(QualType T, ASTContext& Ctx); 879 static QualType getDesugaredType(QualType T, const ASTContext &Context); 880 static SplitQualType getSplitDesugaredType(QualType T); 881 static SplitQualType getSplitUnqualifiedTypeImpl(QualType type); 882 static QualType IgnoreParens(QualType T); 883 static DestructionKind isDestructedTypeImpl(QualType type); 884}; 885 886} // end clang. 887 888namespace llvm { 889/// Implement simplify_type for QualType, so that we can dyn_cast from QualType 890/// to a specific Type class. 891template<> struct simplify_type<const ::clang::QualType> { 892 typedef const ::clang::Type *SimpleType; 893 static SimpleType getSimplifiedValue(const ::clang::QualType &Val) { 894 return Val.getTypePtr(); 895 } 896}; 897template<> struct simplify_type< ::clang::QualType> 898 : public simplify_type<const ::clang::QualType> {}; 899 900// Teach SmallPtrSet that QualType is "basically a pointer". 901template<> 902class PointerLikeTypeTraits<clang::QualType> { 903public: 904 static inline void *getAsVoidPointer(clang::QualType P) { 905 return P.getAsOpaquePtr(); 906 } 907 static inline clang::QualType getFromVoidPointer(void *P) { 908 return clang::QualType::getFromOpaquePtr(P); 909 } 910 // Various qualifiers go in low bits. 911 enum { NumLowBitsAvailable = 0 }; 912}; 913 914} // end namespace llvm 915 916namespace clang { 917 918/// \brief Base class that is common to both the \c ExtQuals and \c Type 919/// classes, which allows \c QualType to access the common fields between the 920/// two. 921/// 922class ExtQualsTypeCommonBase { 923 ExtQualsTypeCommonBase(const Type *baseType, QualType canon) 924 : BaseType(baseType), CanonicalType(canon) {} 925 926 /// \brief The "base" type of an extended qualifiers type (\c ExtQuals) or 927 /// a self-referential pointer (for \c Type). 928 /// 929 /// This pointer allows an efficient mapping from a QualType to its 930 /// underlying type pointer. 931 const Type *const BaseType; 932 933 /// \brief The canonical type of this type. A QualType. 934 QualType CanonicalType; 935 936 friend class QualType; 937 friend class Type; 938 friend class ExtQuals; 939}; 940 941/// ExtQuals - We can encode up to four bits in the low bits of a 942/// type pointer, but there are many more type qualifiers that we want 943/// to be able to apply to an arbitrary type. Therefore we have this 944/// struct, intended to be heap-allocated and used by QualType to 945/// store qualifiers. 946/// 947/// The current design tags the 'const', 'restrict', and 'volatile' qualifiers 948/// in three low bits on the QualType pointer; a fourth bit records whether 949/// the pointer is an ExtQuals node. The extended qualifiers (address spaces, 950/// Objective-C GC attributes) are much more rare. 951class ExtQuals : public ExtQualsTypeCommonBase, public llvm::FoldingSetNode { 952 // NOTE: changing the fast qualifiers should be straightforward as 953 // long as you don't make 'const' non-fast. 954 // 1. Qualifiers: 955 // a) Modify the bitmasks (Qualifiers::TQ and DeclSpec::TQ). 956 // Fast qualifiers must occupy the low-order bits. 957 // b) Update Qualifiers::FastWidth and FastMask. 958 // 2. QualType: 959 // a) Update is{Volatile,Restrict}Qualified(), defined inline. 960 // b) Update remove{Volatile,Restrict}, defined near the end of 961 // this header. 962 // 3. ASTContext: 963 // a) Update get{Volatile,Restrict}Type. 964 965 /// Quals - the immutable set of qualifiers applied by this 966 /// node; always contains extended qualifiers. 967 Qualifiers Quals; 968 969 ExtQuals *this_() { return this; } 970 971public: 972 ExtQuals(const Type *baseType, QualType canon, Qualifiers quals) 973 : ExtQualsTypeCommonBase(baseType, 974 canon.isNull() ? QualType(this_(), 0) : canon), 975 Quals(quals) 976 { 977 assert(Quals.hasNonFastQualifiers() 978 && "ExtQuals created with no fast qualifiers"); 979 assert(!Quals.hasFastQualifiers() 980 && "ExtQuals created with fast qualifiers"); 981 } 982 983 Qualifiers getQualifiers() const { return Quals; } 984 985 bool hasObjCGCAttr() const { return Quals.hasObjCGCAttr(); } 986 Qualifiers::GC getObjCGCAttr() const { return Quals.getObjCGCAttr(); } 987 988 bool hasObjCLifetime() const { return Quals.hasObjCLifetime(); } 989 Qualifiers::ObjCLifetime getObjCLifetime() const { 990 return Quals.getObjCLifetime(); 991 } 992 993 bool hasAddressSpace() const { return Quals.hasAddressSpace(); } 994 unsigned getAddressSpace() const { return Quals.getAddressSpace(); } 995 996 const Type *getBaseType() const { return BaseType; } 997 998public: 999 void Profile(llvm::FoldingSetNodeID &ID) const { 1000 Profile(ID, getBaseType(), Quals); 1001 } 1002 static void Profile(llvm::FoldingSetNodeID &ID, 1003 const Type *BaseType, 1004 Qualifiers Quals) { 1005 assert(!Quals.hasFastQualifiers() && "fast qualifiers in ExtQuals hash!"); 1006 ID.AddPointer(BaseType); 1007 Quals.Profile(ID); 1008 } 1009}; 1010 1011/// \brief The kind of C++0x ref-qualifier associated with a function type, 1012/// which determines whether a member function's "this" object can be an 1013/// lvalue, rvalue, or neither. 1014enum RefQualifierKind { 1015 /// \brief No ref-qualifier was provided. 1016 RQ_None = 0, 1017 /// \brief An lvalue ref-qualifier was provided (\c &). 1018 RQ_LValue, 1019 /// \brief An rvalue ref-qualifier was provided (\c &&). 1020 RQ_RValue 1021}; 1022 1023/// Type - This is the base class of the type hierarchy. A central concept 1024/// with types is that each type always has a canonical type. A canonical type 1025/// is the type with any typedef names stripped out of it or the types it 1026/// references. For example, consider: 1027/// 1028/// typedef int foo; 1029/// typedef foo* bar; 1030/// 'int *' 'foo *' 'bar' 1031/// 1032/// There will be a Type object created for 'int'. Since int is canonical, its 1033/// canonicaltype pointer points to itself. There is also a Type for 'foo' (a 1034/// TypedefType). Its CanonicalType pointer points to the 'int' Type. Next 1035/// there is a PointerType that represents 'int*', which, like 'int', is 1036/// canonical. Finally, there is a PointerType type for 'foo*' whose canonical 1037/// type is 'int*', and there is a TypedefType for 'bar', whose canonical type 1038/// is also 'int*'. 1039/// 1040/// Non-canonical types are useful for emitting diagnostics, without losing 1041/// information about typedefs being used. Canonical types are useful for type 1042/// comparisons (they allow by-pointer equality tests) and useful for reasoning 1043/// about whether something has a particular form (e.g. is a function type), 1044/// because they implicitly, recursively, strip all typedefs out of a type. 1045/// 1046/// Types, once created, are immutable. 1047/// 1048class Type : public ExtQualsTypeCommonBase { 1049public: 1050 enum TypeClass { 1051#define TYPE(Class, Base) Class, 1052#define LAST_TYPE(Class) TypeLast = Class, 1053#define ABSTRACT_TYPE(Class, Base) 1054#include "clang/AST/TypeNodes.def" 1055 TagFirst = Record, TagLast = Enum 1056 }; 1057 1058private: 1059 Type(const Type&); // DO NOT IMPLEMENT. 1060 void operator=(const Type&); // DO NOT IMPLEMENT. 1061 1062 /// Bitfields required by the Type class. 1063 class TypeBitfields { 1064 friend class Type; 1065 template <class T> friend class TypePropertyCache; 1066 1067 /// TypeClass bitfield - Enum that specifies what subclass this belongs to. 1068 unsigned TC : 8; 1069 1070 /// Dependent - Whether this type is a dependent type (C++ [temp.dep.type]). 1071 /// Note that this should stay at the end of the ivars for Type so that 1072 /// subclasses can pack their bitfields into the same word. 1073 unsigned Dependent : 1; 1074 1075 /// \brief Whether this type somehow involves a template parameter, even 1076 /// if the resolution of the type does not depend on a template parameter. 1077 unsigned InstantiationDependent : 1; 1078 1079 /// \brief Whether this type is a variably-modified type (C99 6.7.5). 1080 unsigned VariablyModified : 1; 1081 1082 /// \brief Whether this type contains an unexpanded parameter pack 1083 /// (for C++0x variadic templates). 1084 unsigned ContainsUnexpandedParameterPack : 1; 1085 1086 /// \brief Nonzero if the cache (i.e. the bitfields here starting 1087 /// with 'Cache') is valid. If so, then this is a 1088 /// LangOptions::VisibilityMode+1. 1089 mutable unsigned CacheValidAndVisibility : 2; 1090 1091 /// \brief Linkage of this type. 1092 mutable unsigned CachedLinkage : 2; 1093 1094 /// \brief Whether this type involves and local or unnamed types. 1095 mutable unsigned CachedLocalOrUnnamed : 1; 1096 1097 /// \brief FromAST - Whether this type comes from an AST file. 1098 mutable unsigned FromAST : 1; 1099 1100 bool isCacheValid() const { 1101 return (CacheValidAndVisibility != 0); 1102 } 1103 Visibility getVisibility() const { 1104 assert(isCacheValid() && "getting linkage from invalid cache"); 1105 return static_cast<Visibility>(CacheValidAndVisibility-1); 1106 } 1107 Linkage getLinkage() const { 1108 assert(isCacheValid() && "getting linkage from invalid cache"); 1109 return static_cast<Linkage>(CachedLinkage); 1110 } 1111 bool hasLocalOrUnnamedType() const { 1112 assert(isCacheValid() && "getting linkage from invalid cache"); 1113 return CachedLocalOrUnnamed; 1114 } 1115 }; 1116 enum { NumTypeBits = 18 }; 1117 1118protected: 1119 // These classes allow subclasses to somewhat cleanly pack bitfields 1120 // into Type. 1121 1122 class ArrayTypeBitfields { 1123 friend class ArrayType; 1124 1125 unsigned : NumTypeBits; 1126 1127 /// IndexTypeQuals - CVR qualifiers from declarations like 1128 /// 'int X[static restrict 4]'. For function parameters only. 1129 unsigned IndexTypeQuals : 3; 1130 1131 /// SizeModifier - storage class qualifiers from declarations like 1132 /// 'int X[static restrict 4]'. For function parameters only. 1133 /// Actually an ArrayType::ArraySizeModifier. 1134 unsigned SizeModifier : 3; 1135 }; 1136 1137 class BuiltinTypeBitfields { 1138 friend class BuiltinType; 1139 1140 unsigned : NumTypeBits; 1141 1142 /// The kind (BuiltinType::Kind) of builtin type this is. 1143 unsigned Kind : 8; 1144 }; 1145 1146 class FunctionTypeBitfields { 1147 friend class FunctionType; 1148 1149 unsigned : NumTypeBits; 1150 1151 /// Extra information which affects how the function is called, like 1152 /// regparm and the calling convention. 1153 unsigned ExtInfo : 8; 1154 1155 /// Whether the function is variadic. Only used by FunctionProtoType. 1156 unsigned Variadic : 1; 1157 1158 /// TypeQuals - Used only by FunctionProtoType, put here to pack with the 1159 /// other bitfields. 1160 /// The qualifiers are part of FunctionProtoType because... 1161 /// 1162 /// C++ 8.3.5p4: The return type, the parameter type list and the 1163 /// cv-qualifier-seq, [...], are part of the function type. 1164 unsigned TypeQuals : 3; 1165 1166 /// \brief The ref-qualifier associated with a \c FunctionProtoType. 1167 /// 1168 /// This is a value of type \c RefQualifierKind. 1169 unsigned RefQualifier : 2; 1170 }; 1171 1172 class ObjCObjectTypeBitfields { 1173 friend class ObjCObjectType; 1174 1175 unsigned : NumTypeBits; 1176 1177 /// NumProtocols - The number of protocols stored directly on this 1178 /// object type. 1179 unsigned NumProtocols : 32 - NumTypeBits; 1180 }; 1181 1182 class ReferenceTypeBitfields { 1183 friend class ReferenceType; 1184 1185 unsigned : NumTypeBits; 1186 1187 /// True if the type was originally spelled with an lvalue sigil. 1188 /// This is never true of rvalue references but can also be false 1189 /// on lvalue references because of C++0x [dcl.typedef]p9, 1190 /// as follows: 1191 /// 1192 /// typedef int &ref; // lvalue, spelled lvalue 1193 /// typedef int &&rvref; // rvalue 1194 /// ref &a; // lvalue, inner ref, spelled lvalue 1195 /// ref &&a; // lvalue, inner ref 1196 /// rvref &a; // lvalue, inner ref, spelled lvalue 1197 /// rvref &&a; // rvalue, inner ref 1198 unsigned SpelledAsLValue : 1; 1199 1200 /// True if the inner type is a reference type. This only happens 1201 /// in non-canonical forms. 1202 unsigned InnerRef : 1; 1203 }; 1204 1205 class TypeWithKeywordBitfields { 1206 friend class TypeWithKeyword; 1207 1208 unsigned : NumTypeBits; 1209 1210 /// An ElaboratedTypeKeyword. 8 bits for efficient access. 1211 unsigned Keyword : 8; 1212 }; 1213 1214 class VectorTypeBitfields { 1215 friend class VectorType; 1216 1217 unsigned : NumTypeBits; 1218 1219 /// VecKind - The kind of vector, either a generic vector type or some 1220 /// target-specific vector type such as for AltiVec or Neon. 1221 unsigned VecKind : 3; 1222 1223 /// NumElements - The number of elements in the vector. 1224 unsigned NumElements : 29 - NumTypeBits; 1225 }; 1226 1227 class AttributedTypeBitfields { 1228 friend class AttributedType; 1229 1230 unsigned : NumTypeBits; 1231 1232 /// AttrKind - an AttributedType::Kind 1233 unsigned AttrKind : 32 - NumTypeBits; 1234 }; 1235 1236 union { 1237 TypeBitfields TypeBits; 1238 ArrayTypeBitfields ArrayTypeBits; 1239 AttributedTypeBitfields AttributedTypeBits; 1240 BuiltinTypeBitfields BuiltinTypeBits; 1241 FunctionTypeBitfields FunctionTypeBits; 1242 ObjCObjectTypeBitfields ObjCObjectTypeBits; 1243 ReferenceTypeBitfields ReferenceTypeBits; 1244 TypeWithKeywordBitfields TypeWithKeywordBits; 1245 VectorTypeBitfields VectorTypeBits; 1246 }; 1247 1248private: 1249 /// \brief Set whether this type comes from an AST file. 1250 void setFromAST(bool V = true) const { 1251 TypeBits.FromAST = V; 1252 } 1253 1254 template <class T> friend class TypePropertyCache; 1255 1256protected: 1257 // silence VC++ warning C4355: 'this' : used in base member initializer list 1258 Type *this_() { return this; } 1259 Type(TypeClass tc, QualType canon, bool Dependent, 1260 bool InstantiationDependent, bool VariablyModified, 1261 bool ContainsUnexpandedParameterPack) 1262 : ExtQualsTypeCommonBase(this, 1263 canon.isNull() ? QualType(this_(), 0) : canon) { 1264 TypeBits.TC = tc; 1265 TypeBits.Dependent = Dependent; 1266 TypeBits.InstantiationDependent = Dependent || InstantiationDependent; 1267 TypeBits.VariablyModified = VariablyModified; 1268 TypeBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 1269 TypeBits.CacheValidAndVisibility = 0; 1270 TypeBits.CachedLocalOrUnnamed = false; 1271 TypeBits.CachedLinkage = NoLinkage; 1272 TypeBits.FromAST = false; 1273 } 1274 friend class ASTContext; 1275 1276 void setDependent(bool D = true) { 1277 TypeBits.Dependent = D; 1278 if (D) 1279 TypeBits.InstantiationDependent = true; 1280 } 1281 void setInstantiationDependent(bool D = true) { 1282 TypeBits.InstantiationDependent = D; } 1283 void setVariablyModified(bool VM = true) { TypeBits.VariablyModified = VM; 1284 } 1285 void setContainsUnexpandedParameterPack(bool PP = true) { 1286 TypeBits.ContainsUnexpandedParameterPack = PP; 1287 } 1288 1289public: 1290 TypeClass getTypeClass() const { return static_cast<TypeClass>(TypeBits.TC); } 1291 1292 /// \brief Whether this type comes from an AST file. 1293 bool isFromAST() const { return TypeBits.FromAST; } 1294 1295 /// \brief Whether this type is or contains an unexpanded parameter 1296 /// pack, used to support C++0x variadic templates. 1297 /// 1298 /// A type that contains a parameter pack shall be expanded by the 1299 /// ellipsis operator at some point. For example, the typedef in the 1300 /// following example contains an unexpanded parameter pack 'T': 1301 /// 1302 /// \code 1303 /// template<typename ...T> 1304 /// struct X { 1305 /// typedef T* pointer_types; // ill-formed; T is a parameter pack. 1306 /// }; 1307 /// \endcode 1308 /// 1309 /// Note that this routine does not specify which 1310 bool containsUnexpandedParameterPack() const { 1311 return TypeBits.ContainsUnexpandedParameterPack; 1312 } 1313 1314 /// Determines if this type would be canonical if it had no further 1315 /// qualification. 1316 bool isCanonicalUnqualified() const { 1317 return CanonicalType == QualType(this, 0); 1318 } 1319 1320 /// Types are partitioned into 3 broad categories (C99 6.2.5p1): 1321 /// object types, function types, and incomplete types. 1322 1323 /// isIncompleteType - Return true if this is an incomplete type. 1324 /// A type that can describe objects, but which lacks information needed to 1325 /// determine its size (e.g. void, or a fwd declared struct). Clients of this 1326 /// routine will need to determine if the size is actually required. 1327 bool isIncompleteType() const; 1328 1329 /// isIncompleteOrObjectType - Return true if this is an incomplete or object 1330 /// type, in other words, not a function type. 1331 bool isIncompleteOrObjectType() const { 1332 return !isFunctionType(); 1333 } 1334 1335 /// \brief Determine whether this type is an object type. 1336 bool isObjectType() const { 1337 // C++ [basic.types]p8: 1338 // An object type is a (possibly cv-qualified) type that is not a 1339 // function type, not a reference type, and not a void type. 1340 return !isReferenceType() && !isFunctionType() && !isVoidType(); 1341 } 1342 1343 /// isLiteralType - Return true if this is a literal type 1344 /// (C++0x [basic.types]p10) 1345 bool isLiteralType() const; 1346 1347 /// \brief Test if this type is a standard-layout type. 1348 /// (C++0x [basic.type]p9) 1349 bool isStandardLayoutType() const; 1350 1351 /// Helper methods to distinguish type categories. All type predicates 1352 /// operate on the canonical type, ignoring typedefs and qualifiers. 1353 1354 /// isBuiltinType - returns true if the type is a builtin type. 1355 bool isBuiltinType() const; 1356 1357 /// isSpecificBuiltinType - Test for a particular builtin type. 1358 bool isSpecificBuiltinType(unsigned K) const; 1359 1360 /// isPlaceholderType - Test for a type which does not represent an 1361 /// actual type-system type but is instead used as a placeholder for 1362 /// various convenient purposes within Clang. All such types are 1363 /// BuiltinTypes. 1364 bool isPlaceholderType() const; 1365 const BuiltinType *getAsPlaceholderType() const; 1366 1367 /// isSpecificPlaceholderType - Test for a specific placeholder type. 1368 bool isSpecificPlaceholderType(unsigned K) const; 1369 1370 /// isNonOverloadPlaceholderType - Test for a placeholder type 1371 /// other than Overload; see BuiltinType::isNonOverloadPlaceholderType. 1372 bool isNonOverloadPlaceholderType() const; 1373 1374 /// isIntegerType() does *not* include complex integers (a GCC extension). 1375 /// isComplexIntegerType() can be used to test for complex integers. 1376 bool isIntegerType() const; // C99 6.2.5p17 (int, char, bool, enum) 1377 bool isEnumeralType() const; 1378 bool isBooleanType() const; 1379 bool isCharType() const; 1380 bool isWideCharType() const; 1381 bool isChar16Type() const; 1382 bool isChar32Type() const; 1383 bool isAnyCharacterType() const; 1384 bool isIntegralType(ASTContext &Ctx) const; 1385 1386 /// \brief Determine whether this type is an integral or enumeration type. 1387 bool isIntegralOrEnumerationType() const; 1388 /// \brief Determine whether this type is an integral or unscoped enumeration 1389 /// type. 1390 bool isIntegralOrUnscopedEnumerationType() const; 1391 1392 /// Floating point categories. 1393 bool isRealFloatingType() const; // C99 6.2.5p10 (float, double, long double) 1394 /// isComplexType() does *not* include complex integers (a GCC extension). 1395 /// isComplexIntegerType() can be used to test for complex integers. 1396 bool isComplexType() const; // C99 6.2.5p11 (complex) 1397 bool isAnyComplexType() const; // C99 6.2.5p11 (complex) + Complex Int. 1398 bool isFloatingType() const; // C99 6.2.5p11 (real floating + complex) 1399 bool isHalfType() const; // OpenCL 6.1.1.1, NEON (IEEE 754-2008 half) 1400 bool isRealType() const; // C99 6.2.5p17 (real floating + integer) 1401 bool isArithmeticType() const; // C99 6.2.5p18 (integer + floating) 1402 bool isVoidType() const; // C99 6.2.5p19 1403 bool isDerivedType() const; // C99 6.2.5p20 1404 bool isScalarType() const; // C99 6.2.5p21 (arithmetic + pointers) 1405 bool isAggregateType() const; 1406 bool isFundamentalType() const; 1407 bool isCompoundType() const; 1408 1409 // Type Predicates: Check to see if this type is structurally the specified 1410 // type, ignoring typedefs and qualifiers. 1411 bool isFunctionType() const; 1412 bool isFunctionNoProtoType() const { return getAs<FunctionNoProtoType>(); } 1413 bool isFunctionProtoType() const { return getAs<FunctionProtoType>(); } 1414 bool isPointerType() const; 1415 bool isAnyPointerType() const; // Any C pointer or ObjC object pointer 1416 bool isBlockPointerType() const; 1417 bool isVoidPointerType() const; 1418 bool isReferenceType() const; 1419 bool isLValueReferenceType() const; 1420 bool isRValueReferenceType() const; 1421 bool isFunctionPointerType() const; 1422 bool isMemberPointerType() const; 1423 bool isMemberFunctionPointerType() const; 1424 bool isMemberDataPointerType() const; 1425 bool isArrayType() const; 1426 bool isConstantArrayType() const; 1427 bool isIncompleteArrayType() const; 1428 bool isVariableArrayType() const; 1429 bool isDependentSizedArrayType() const; 1430 bool isRecordType() const; 1431 bool isClassType() const; 1432 bool isStructureType() const; 1433 bool isStructureOrClassType() const; 1434 bool isUnionType() const; 1435 bool isComplexIntegerType() const; // GCC _Complex integer type. 1436 bool isVectorType() const; // GCC vector type. 1437 bool isExtVectorType() const; // Extended vector type. 1438 bool isObjCObjectPointerType() const; // pointer to ObjC object 1439 bool isObjCRetainableType() const; // ObjC object or block pointer 1440 bool isObjCLifetimeType() const; // (array of)* retainable type 1441 bool isObjCIndirectLifetimeType() const; // (pointer to)* lifetime type 1442 bool isObjCNSObjectType() const; // __attribute__((NSObject)) 1443 // FIXME: change this to 'raw' interface type, so we can used 'interface' type 1444 // for the common case. 1445 bool isObjCObjectType() const; // NSString or typeof(*(id)0) 1446 bool isObjCQualifiedInterfaceType() const; // NSString<foo> 1447 bool isObjCQualifiedIdType() const; // id<foo> 1448 bool isObjCQualifiedClassType() const; // Class<foo> 1449 bool isObjCObjectOrInterfaceType() const; 1450 bool isObjCIdType() const; // id 1451 bool isObjCClassType() const; // Class 1452 bool isObjCSelType() const; // Class 1453 bool isObjCBuiltinType() const; // 'id' or 'Class' 1454 bool isObjCARCBridgableType() const; 1455 bool isCARCBridgableType() const; 1456 bool isTemplateTypeParmType() const; // C++ template type parameter 1457 bool isNullPtrType() const; // C++0x nullptr_t 1458 bool isAtomicType() const; // C1X _Atomic() 1459 1460 /// Determines if this type, which must satisfy 1461 /// isObjCLifetimeType(), is implicitly __unsafe_unretained rather 1462 /// than implicitly __strong. 1463 bool isObjCARCImplicitlyUnretainedType() const; 1464 1465 /// Return the implicit lifetime for this type, which must not be dependent. 1466 Qualifiers::ObjCLifetime getObjCARCImplicitLifetime() const; 1467 1468 enum ScalarTypeKind { 1469 STK_CPointer, 1470 STK_BlockPointer, 1471 STK_ObjCObjectPointer, 1472 STK_MemberPointer, 1473 STK_Bool, 1474 STK_Integral, 1475 STK_Floating, 1476 STK_IntegralComplex, 1477 STK_FloatingComplex 1478 }; 1479 /// getScalarTypeKind - Given that this is a scalar type, classify it. 1480 ScalarTypeKind getScalarTypeKind() const; 1481 1482 /// isDependentType - Whether this type is a dependent type, meaning 1483 /// that its definition somehow depends on a template parameter 1484 /// (C++ [temp.dep.type]). 1485 bool isDependentType() const { return TypeBits.Dependent; } 1486 1487 /// \brief Determine whether this type is an instantiation-dependent type, 1488 /// meaning that the type involves a template parameter (even if the 1489 /// definition does not actually depend on the type substituted for that 1490 /// template parameter). 1491 bool isInstantiationDependentType() const { 1492 return TypeBits.InstantiationDependent; 1493 } 1494 1495 /// \brief Whether this type is a variably-modified type (C99 6.7.5). 1496 bool isVariablyModifiedType() const { return TypeBits.VariablyModified; } 1497 1498 /// \brief Whether this type involves a variable-length array type 1499 /// with a definite size. 1500 bool hasSizedVLAType() const; 1501 1502 /// \brief Whether this type is or contains a local or unnamed type. 1503 bool hasUnnamedOrLocalType() const; 1504 1505 bool isOverloadableType() const; 1506 1507 /// \brief Determine wither this type is a C++ elaborated-type-specifier. 1508 bool isElaboratedTypeSpecifier() const; 1509 1510 bool canDecayToPointerType() const; 1511 1512 /// hasPointerRepresentation - Whether this type is represented 1513 /// natively as a pointer; this includes pointers, references, block 1514 /// pointers, and Objective-C interface, qualified id, and qualified 1515 /// interface types, as well as nullptr_t. 1516 bool hasPointerRepresentation() const; 1517 1518 /// hasObjCPointerRepresentation - Whether this type can represent 1519 /// an objective pointer type for the purpose of GC'ability 1520 bool hasObjCPointerRepresentation() const; 1521 1522 /// \brief Determine whether this type has an integer representation 1523 /// of some sort, e.g., it is an integer type or a vector. 1524 bool hasIntegerRepresentation() const; 1525 1526 /// \brief Determine whether this type has an signed integer representation 1527 /// of some sort, e.g., it is an signed integer type or a vector. 1528 bool hasSignedIntegerRepresentation() const; 1529 1530 /// \brief Determine whether this type has an unsigned integer representation 1531 /// of some sort, e.g., it is an unsigned integer type or a vector. 1532 bool hasUnsignedIntegerRepresentation() const; 1533 1534 /// \brief Determine whether this type has a floating-point representation 1535 /// of some sort, e.g., it is a floating-point type or a vector thereof. 1536 bool hasFloatingRepresentation() const; 1537 1538 // Type Checking Functions: Check to see if this type is structurally the 1539 // specified type, ignoring typedefs and qualifiers, and return a pointer to 1540 // the best type we can. 1541 const RecordType *getAsStructureType() const; 1542 /// NOTE: getAs*ArrayType are methods on ASTContext. 1543 const RecordType *getAsUnionType() const; 1544 const ComplexType *getAsComplexIntegerType() const; // GCC complex int type. 1545 // The following is a convenience method that returns an ObjCObjectPointerType 1546 // for object declared using an interface. 1547 const ObjCObjectPointerType *getAsObjCInterfacePointerType() const; 1548 const ObjCObjectPointerType *getAsObjCQualifiedIdType() const; 1549 const ObjCObjectPointerType *getAsObjCQualifiedClassType() const; 1550 const ObjCObjectType *getAsObjCQualifiedInterfaceType() const; 1551 const CXXRecordDecl *getCXXRecordDeclForPointerType() const; 1552 1553 /// \brief Retrieves the CXXRecordDecl that this type refers to, either 1554 /// because the type is a RecordType or because it is the injected-class-name 1555 /// type of a class template or class template partial specialization. 1556 CXXRecordDecl *getAsCXXRecordDecl() const; 1557 1558 /// \brief Get the AutoType whose type will be deduced for a variable with 1559 /// an initializer of this type. This looks through declarators like pointer 1560 /// types, but not through decltype or typedefs. 1561 AutoType *getContainedAutoType() const; 1562 1563 /// Member-template getAs<specific type>'. Look through sugar for 1564 /// an instance of <specific type>. This scheme will eventually 1565 /// replace the specific getAsXXXX methods above. 1566 /// 1567 /// There are some specializations of this member template listed 1568 /// immediately following this class. 1569 template <typename T> const T *getAs() const; 1570 1571 /// A variant of getAs<> for array types which silently discards 1572 /// qualifiers from the outermost type. 1573 const ArrayType *getAsArrayTypeUnsafe() const; 1574 1575 /// Member-template castAs<specific type>. Look through sugar for 1576 /// the underlying instance of <specific type>. 1577 /// 1578 /// This method has the same relationship to getAs<T> as cast<T> has 1579 /// to dyn_cast<T>; which is to say, the underlying type *must* 1580 /// have the intended type, and this method will never return null. 1581 template <typename T> const T *castAs() const; 1582 1583 /// A variant of castAs<> for array type which silently discards 1584 /// qualifiers from the outermost type. 1585 const ArrayType *castAsArrayTypeUnsafe() const; 1586 1587 /// getBaseElementTypeUnsafe - Get the base element type of this 1588 /// type, potentially discarding type qualifiers. This method 1589 /// should never be used when type qualifiers are meaningful. 1590 const Type *getBaseElementTypeUnsafe() const; 1591 1592 /// getArrayElementTypeNoTypeQual - If this is an array type, return the 1593 /// element type of the array, potentially with type qualifiers missing. 1594 /// This method should never be used when type qualifiers are meaningful. 1595 const Type *getArrayElementTypeNoTypeQual() const; 1596 1597 /// getPointeeType - If this is a pointer, ObjC object pointer, or block 1598 /// pointer, this returns the respective pointee. 1599 QualType getPointeeType() const; 1600 1601 /// getUnqualifiedDesugaredType() - Return the specified type with 1602 /// any "sugar" removed from the type, removing any typedefs, 1603 /// typeofs, etc., as well as any qualifiers. 1604 const Type *getUnqualifiedDesugaredType() const; 1605 1606 /// More type predicates useful for type checking/promotion 1607 bool isPromotableIntegerType() const; // C99 6.3.1.1p2 1608 1609 /// isSignedIntegerType - Return true if this is an integer type that is 1610 /// signed, according to C99 6.2.5p4 [char, signed char, short, int, long..], 1611 /// or an enum decl which has a signed representation. 1612 bool isSignedIntegerType() const; 1613 1614 /// isUnsignedIntegerType - Return true if this is an integer type that is 1615 /// unsigned, according to C99 6.2.5p6 [which returns true for _Bool], 1616 /// or an enum decl which has an unsigned representation. 1617 bool isUnsignedIntegerType() const; 1618 1619 /// Determines whether this is an integer type that is signed or an 1620 /// enumeration types whose underlying type is a signed integer type. 1621 bool isSignedIntegerOrEnumerationType() const; 1622 1623 /// Determines whether this is an integer type that is unsigned or an 1624 /// enumeration types whose underlying type is a unsigned integer type. 1625 bool isUnsignedIntegerOrEnumerationType() const; 1626 1627 /// isConstantSizeType - Return true if this is not a variable sized type, 1628 /// according to the rules of C99 6.7.5p3. It is not legal to call this on 1629 /// incomplete types. 1630 bool isConstantSizeType() const; 1631 1632 /// isSpecifierType - Returns true if this type can be represented by some 1633 /// set of type specifiers. 1634 bool isSpecifierType() const; 1635 1636 /// \brief Determine the linkage of this type. 1637 Linkage getLinkage() const; 1638 1639 /// \brief Determine the visibility of this type. 1640 Visibility getVisibility() const; 1641 1642 /// \brief Determine the linkage and visibility of this type. 1643 std::pair<Linkage,Visibility> getLinkageAndVisibility() const; 1644 1645 /// \brief Note that the linkage is no longer known. 1646 void ClearLinkageCache(); 1647 1648 const char *getTypeClassName() const; 1649 1650 QualType getCanonicalTypeInternal() const { 1651 return CanonicalType; 1652 } 1653 CanQualType getCanonicalTypeUnqualified() const; // in CanonicalType.h 1654 void dump() const; 1655 1656 static bool classof(const Type *) { return true; } 1657 1658 friend class ASTReader; 1659 friend class ASTWriter; 1660}; 1661 1662template <> inline const TypedefType *Type::getAs() const { 1663 return dyn_cast<TypedefType>(this); 1664} 1665 1666// We can do canonical leaf types faster, because we don't have to 1667// worry about preserving child type decoration. 1668#define TYPE(Class, Base) 1669#define LEAF_TYPE(Class) \ 1670template <> inline const Class##Type *Type::getAs() const { \ 1671 return dyn_cast<Class##Type>(CanonicalType); \ 1672} \ 1673template <> inline const Class##Type *Type::castAs() const { \ 1674 return cast<Class##Type>(CanonicalType); \ 1675} 1676#include "clang/AST/TypeNodes.def" 1677 1678 1679/// BuiltinType - This class is used for builtin types like 'int'. Builtin 1680/// types are always canonical and have a literal name field. 1681class BuiltinType : public Type { 1682public: 1683 enum Kind { 1684#define BUILTIN_TYPE(Id, SingletonId) Id, 1685#define LAST_BUILTIN_TYPE(Id) LastKind = Id 1686#include "clang/AST/BuiltinTypes.def" 1687 }; 1688 1689public: 1690 BuiltinType(Kind K) 1691 : Type(Builtin, QualType(), /*Dependent=*/(K == Dependent), 1692 /*InstantiationDependent=*/(K == Dependent), 1693 /*VariablyModified=*/false, 1694 /*Unexpanded paramter pack=*/false) { 1695 BuiltinTypeBits.Kind = K; 1696 } 1697 1698 Kind getKind() const { return static_cast<Kind>(BuiltinTypeBits.Kind); } 1699 const char *getName(const PrintingPolicy &Policy) const; 1700 1701 bool isSugared() const { return false; } 1702 QualType desugar() const { return QualType(this, 0); } 1703 1704 bool isInteger() const { 1705 return getKind() >= Bool && getKind() <= Int128; 1706 } 1707 1708 bool isSignedInteger() const { 1709 return getKind() >= Char_S && getKind() <= Int128; 1710 } 1711 1712 bool isUnsignedInteger() const { 1713 return getKind() >= Bool && getKind() <= UInt128; 1714 } 1715 1716 bool isFloatingPoint() const { 1717 return getKind() >= Half && getKind() <= LongDouble; 1718 } 1719 1720 /// Determines whether the given kind corresponds to a placeholder type. 1721 static bool isPlaceholderTypeKind(Kind K) { 1722 return K >= Overload; 1723 } 1724 1725 /// Determines whether this type is a placeholder type, i.e. a type 1726 /// which cannot appear in arbitrary positions in a fully-formed 1727 /// expression. 1728 bool isPlaceholderType() const { 1729 return isPlaceholderTypeKind(getKind()); 1730 } 1731 1732 /// Determines whether this type is a placeholder type other than 1733 /// Overload. Most placeholder types require only syntactic 1734 /// information about their context in order to be resolved (e.g. 1735 /// whether it is a call expression), which means they can (and 1736 /// should) be resolved in an earlier "phase" of analysis. 1737 /// Overload expressions sometimes pick up further information 1738 /// from their context, like whether the context expects a 1739 /// specific function-pointer type, and so frequently need 1740 /// special treatment. 1741 bool isNonOverloadPlaceholderType() const { 1742 return getKind() > Overload; 1743 } 1744 1745 static bool classof(const Type *T) { return T->getTypeClass() == Builtin; } 1746 static bool classof(const BuiltinType *) { return true; } 1747}; 1748 1749/// ComplexType - C99 6.2.5p11 - Complex values. This supports the C99 complex 1750/// types (_Complex float etc) as well as the GCC integer complex extensions. 1751/// 1752class ComplexType : public Type, public llvm::FoldingSetNode { 1753 QualType ElementType; 1754 ComplexType(QualType Element, QualType CanonicalPtr) : 1755 Type(Complex, CanonicalPtr, Element->isDependentType(), 1756 Element->isInstantiationDependentType(), 1757 Element->isVariablyModifiedType(), 1758 Element->containsUnexpandedParameterPack()), 1759 ElementType(Element) { 1760 } 1761 friend class ASTContext; // ASTContext creates these. 1762 1763public: 1764 QualType getElementType() const { return ElementType; } 1765 1766 bool isSugared() const { return false; } 1767 QualType desugar() const { return QualType(this, 0); } 1768 1769 void Profile(llvm::FoldingSetNodeID &ID) { 1770 Profile(ID, getElementType()); 1771 } 1772 static void Profile(llvm::FoldingSetNodeID &ID, QualType Element) { 1773 ID.AddPointer(Element.getAsOpaquePtr()); 1774 } 1775 1776 static bool classof(const Type *T) { return T->getTypeClass() == Complex; } 1777 static bool classof(const ComplexType *) { return true; } 1778}; 1779 1780/// ParenType - Sugar for parentheses used when specifying types. 1781/// 1782class ParenType : public Type, public llvm::FoldingSetNode { 1783 QualType Inner; 1784 1785 ParenType(QualType InnerType, QualType CanonType) : 1786 Type(Paren, CanonType, InnerType->isDependentType(), 1787 InnerType->isInstantiationDependentType(), 1788 InnerType->isVariablyModifiedType(), 1789 InnerType->containsUnexpandedParameterPack()), 1790 Inner(InnerType) { 1791 } 1792 friend class ASTContext; // ASTContext creates these. 1793 1794public: 1795 1796 QualType getInnerType() const { return Inner; } 1797 1798 bool isSugared() const { return true; } 1799 QualType desugar() const { return getInnerType(); } 1800 1801 void Profile(llvm::FoldingSetNodeID &ID) { 1802 Profile(ID, getInnerType()); 1803 } 1804 static void Profile(llvm::FoldingSetNodeID &ID, QualType Inner) { 1805 Inner.Profile(ID); 1806 } 1807 1808 static bool classof(const Type *T) { return T->getTypeClass() == Paren; } 1809 static bool classof(const ParenType *) { return true; } 1810}; 1811 1812/// PointerType - C99 6.7.5.1 - Pointer Declarators. 1813/// 1814class PointerType : public Type, public llvm::FoldingSetNode { 1815 QualType PointeeType; 1816 1817 PointerType(QualType Pointee, QualType CanonicalPtr) : 1818 Type(Pointer, CanonicalPtr, Pointee->isDependentType(), 1819 Pointee->isInstantiationDependentType(), 1820 Pointee->isVariablyModifiedType(), 1821 Pointee->containsUnexpandedParameterPack()), 1822 PointeeType(Pointee) { 1823 } 1824 friend class ASTContext; // ASTContext creates these. 1825 1826public: 1827 1828 QualType getPointeeType() const { return PointeeType; } 1829 1830 bool isSugared() const { return false; } 1831 QualType desugar() const { return QualType(this, 0); } 1832 1833 void Profile(llvm::FoldingSetNodeID &ID) { 1834 Profile(ID, getPointeeType()); 1835 } 1836 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee) { 1837 ID.AddPointer(Pointee.getAsOpaquePtr()); 1838 } 1839 1840 static bool classof(const Type *T) { return T->getTypeClass() == Pointer; } 1841 static bool classof(const PointerType *) { return true; } 1842}; 1843 1844/// BlockPointerType - pointer to a block type. 1845/// This type is to represent types syntactically represented as 1846/// "void (^)(int)", etc. Pointee is required to always be a function type. 1847/// 1848class BlockPointerType : public Type, public llvm::FoldingSetNode { 1849 QualType PointeeType; // Block is some kind of pointer type 1850 BlockPointerType(QualType Pointee, QualType CanonicalCls) : 1851 Type(BlockPointer, CanonicalCls, Pointee->isDependentType(), 1852 Pointee->isInstantiationDependentType(), 1853 Pointee->isVariablyModifiedType(), 1854 Pointee->containsUnexpandedParameterPack()), 1855 PointeeType(Pointee) { 1856 } 1857 friend class ASTContext; // ASTContext creates these. 1858 1859public: 1860 1861 // Get the pointee type. Pointee is required to always be a function type. 1862 QualType getPointeeType() const { return PointeeType; } 1863 1864 bool isSugared() const { return false; } 1865 QualType desugar() const { return QualType(this, 0); } 1866 1867 void Profile(llvm::FoldingSetNodeID &ID) { 1868 Profile(ID, getPointeeType()); 1869 } 1870 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee) { 1871 ID.AddPointer(Pointee.getAsOpaquePtr()); 1872 } 1873 1874 static bool classof(const Type *T) { 1875 return T->getTypeClass() == BlockPointer; 1876 } 1877 static bool classof(const BlockPointerType *) { return true; } 1878}; 1879 1880/// ReferenceType - Base for LValueReferenceType and RValueReferenceType 1881/// 1882class ReferenceType : public Type, public llvm::FoldingSetNode { 1883 QualType PointeeType; 1884 1885protected: 1886 ReferenceType(TypeClass tc, QualType Referencee, QualType CanonicalRef, 1887 bool SpelledAsLValue) : 1888 Type(tc, CanonicalRef, Referencee->isDependentType(), 1889 Referencee->isInstantiationDependentType(), 1890 Referencee->isVariablyModifiedType(), 1891 Referencee->containsUnexpandedParameterPack()), 1892 PointeeType(Referencee) 1893 { 1894 ReferenceTypeBits.SpelledAsLValue = SpelledAsLValue; 1895 ReferenceTypeBits.InnerRef = Referencee->isReferenceType(); 1896 } 1897 1898public: 1899 bool isSpelledAsLValue() const { return ReferenceTypeBits.SpelledAsLValue; } 1900 bool isInnerRef() const { return ReferenceTypeBits.InnerRef; } 1901 1902 QualType getPointeeTypeAsWritten() const { return PointeeType; } 1903 QualType getPointeeType() const { 1904 // FIXME: this might strip inner qualifiers; okay? 1905 const ReferenceType *T = this; 1906 while (T->isInnerRef()) 1907 T = T->PointeeType->castAs<ReferenceType>(); 1908 return T->PointeeType; 1909 } 1910 1911 void Profile(llvm::FoldingSetNodeID &ID) { 1912 Profile(ID, PointeeType, isSpelledAsLValue()); 1913 } 1914 static void Profile(llvm::FoldingSetNodeID &ID, 1915 QualType Referencee, 1916 bool SpelledAsLValue) { 1917 ID.AddPointer(Referencee.getAsOpaquePtr()); 1918 ID.AddBoolean(SpelledAsLValue); 1919 } 1920 1921 static bool classof(const Type *T) { 1922 return T->getTypeClass() == LValueReference || 1923 T->getTypeClass() == RValueReference; 1924 } 1925 static bool classof(const ReferenceType *) { return true; } 1926}; 1927 1928/// LValueReferenceType - C++ [dcl.ref] - Lvalue reference 1929/// 1930class LValueReferenceType : public ReferenceType { 1931 LValueReferenceType(QualType Referencee, QualType CanonicalRef, 1932 bool SpelledAsLValue) : 1933 ReferenceType(LValueReference, Referencee, CanonicalRef, SpelledAsLValue) 1934 {} 1935 friend class ASTContext; // ASTContext creates these 1936public: 1937 bool isSugared() const { return false; } 1938 QualType desugar() const { return QualType(this, 0); } 1939 1940 static bool classof(const Type *T) { 1941 return T->getTypeClass() == LValueReference; 1942 } 1943 static bool classof(const LValueReferenceType *) { return true; } 1944}; 1945 1946/// RValueReferenceType - C++0x [dcl.ref] - Rvalue reference 1947/// 1948class RValueReferenceType : public ReferenceType { 1949 RValueReferenceType(QualType Referencee, QualType CanonicalRef) : 1950 ReferenceType(RValueReference, Referencee, CanonicalRef, false) { 1951 } 1952 friend class ASTContext; // ASTContext creates these 1953public: 1954 bool isSugared() const { return false; } 1955 QualType desugar() const { return QualType(this, 0); } 1956 1957 static bool classof(const Type *T) { 1958 return T->getTypeClass() == RValueReference; 1959 } 1960 static bool classof(const RValueReferenceType *) { return true; } 1961}; 1962 1963/// MemberPointerType - C++ 8.3.3 - Pointers to members 1964/// 1965class MemberPointerType : public Type, public llvm::FoldingSetNode { 1966 QualType PointeeType; 1967 /// The class of which the pointee is a member. Must ultimately be a 1968 /// RecordType, but could be a typedef or a template parameter too. 1969 const Type *Class; 1970 1971 MemberPointerType(QualType Pointee, const Type *Cls, QualType CanonicalPtr) : 1972 Type(MemberPointer, CanonicalPtr, 1973 Cls->isDependentType() || Pointee->isDependentType(), 1974 (Cls->isInstantiationDependentType() || 1975 Pointee->isInstantiationDependentType()), 1976 Pointee->isVariablyModifiedType(), 1977 (Cls->containsUnexpandedParameterPack() || 1978 Pointee->containsUnexpandedParameterPack())), 1979 PointeeType(Pointee), Class(Cls) { 1980 } 1981 friend class ASTContext; // ASTContext creates these. 1982 1983public: 1984 QualType getPointeeType() const { return PointeeType; } 1985 1986 /// Returns true if the member type (i.e. the pointee type) is a 1987 /// function type rather than a data-member type. 1988 bool isMemberFunctionPointer() const { 1989 return PointeeType->isFunctionProtoType(); 1990 } 1991 1992 /// Returns true if the member type (i.e. the pointee type) is a 1993 /// data type rather than a function type. 1994 bool isMemberDataPointer() const { 1995 return !PointeeType->isFunctionProtoType(); 1996 } 1997 1998 const Type *getClass() const { return Class; } 1999 2000 bool isSugared() const { return false; } 2001 QualType desugar() const { return QualType(this, 0); } 2002 2003 void Profile(llvm::FoldingSetNodeID &ID) { 2004 Profile(ID, getPointeeType(), getClass()); 2005 } 2006 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee, 2007 const Type *Class) { 2008 ID.AddPointer(Pointee.getAsOpaquePtr()); 2009 ID.AddPointer(Class); 2010 } 2011 2012 static bool classof(const Type *T) { 2013 return T->getTypeClass() == MemberPointer; 2014 } 2015 static bool classof(const MemberPointerType *) { return true; } 2016}; 2017 2018/// ArrayType - C99 6.7.5.2 - Array Declarators. 2019/// 2020class ArrayType : public Type, public llvm::FoldingSetNode { 2021public: 2022 /// ArraySizeModifier - Capture whether this is a normal array (e.g. int X[4]) 2023 /// an array with a static size (e.g. int X[static 4]), or an array 2024 /// with a star size (e.g. int X[*]). 2025 /// 'static' is only allowed on function parameters. 2026 enum ArraySizeModifier { 2027 Normal, Static, Star 2028 }; 2029private: 2030 /// ElementType - The element type of the array. 2031 QualType ElementType; 2032 2033protected: 2034 // C++ [temp.dep.type]p1: 2035 // A type is dependent if it is... 2036 // - an array type constructed from any dependent type or whose 2037 // size is specified by a constant expression that is 2038 // value-dependent, 2039 ArrayType(TypeClass tc, QualType et, QualType can, 2040 ArraySizeModifier sm, unsigned tq, 2041 bool ContainsUnexpandedParameterPack) 2042 : Type(tc, can, et->isDependentType() || tc == DependentSizedArray, 2043 et->isInstantiationDependentType() || tc == DependentSizedArray, 2044 (tc == VariableArray || et->isVariablyModifiedType()), 2045 ContainsUnexpandedParameterPack), 2046 ElementType(et) { 2047 ArrayTypeBits.IndexTypeQuals = tq; 2048 ArrayTypeBits.SizeModifier = sm; 2049 } 2050 2051 friend class ASTContext; // ASTContext creates these. 2052 2053public: 2054 QualType getElementType() const { return ElementType; } 2055 ArraySizeModifier getSizeModifier() const { 2056 return ArraySizeModifier(ArrayTypeBits.SizeModifier); 2057 } 2058 Qualifiers getIndexTypeQualifiers() const { 2059 return Qualifiers::fromCVRMask(getIndexTypeCVRQualifiers()); 2060 } 2061 unsigned getIndexTypeCVRQualifiers() const { 2062 return ArrayTypeBits.IndexTypeQuals; 2063 } 2064 2065 static bool classof(const Type *T) { 2066 return T->getTypeClass() == ConstantArray || 2067 T->getTypeClass() == VariableArray || 2068 T->getTypeClass() == IncompleteArray || 2069 T->getTypeClass() == DependentSizedArray; 2070 } 2071 static bool classof(const ArrayType *) { return true; } 2072}; 2073 2074/// ConstantArrayType - This class represents the canonical version of 2075/// C arrays with a specified constant size. For example, the canonical 2076/// type for 'int A[4 + 4*100]' is a ConstantArrayType where the element 2077/// type is 'int' and the size is 404. 2078class ConstantArrayType : public ArrayType { 2079 llvm::APInt Size; // Allows us to unique the type. 2080 2081 ConstantArrayType(QualType et, QualType can, const llvm::APInt &size, 2082 ArraySizeModifier sm, unsigned tq) 2083 : ArrayType(ConstantArray, et, can, sm, tq, 2084 et->containsUnexpandedParameterPack()), 2085 Size(size) {} 2086protected: 2087 ConstantArrayType(TypeClass tc, QualType et, QualType can, 2088 const llvm::APInt &size, ArraySizeModifier sm, unsigned tq) 2089 : ArrayType(tc, et, can, sm, tq, et->containsUnexpandedParameterPack()), 2090 Size(size) {} 2091 friend class ASTContext; // ASTContext creates these. 2092public: 2093 const llvm::APInt &getSize() const { return Size; } 2094 bool isSugared() const { return false; } 2095 QualType desugar() const { return QualType(this, 0); } 2096 2097 2098 /// \brief Determine the number of bits required to address a member of 2099 // an array with the given element type and number of elements. 2100 static unsigned getNumAddressingBits(ASTContext &Context, 2101 QualType ElementType, 2102 const llvm::APInt &NumElements); 2103 2104 /// \brief Determine the maximum number of active bits that an array's size 2105 /// can require, which limits the maximum size of the array. 2106 static unsigned getMaxSizeBits(ASTContext &Context); 2107 2108 void Profile(llvm::FoldingSetNodeID &ID) { 2109 Profile(ID, getElementType(), getSize(), 2110 getSizeModifier(), getIndexTypeCVRQualifiers()); 2111 } 2112 static void Profile(llvm::FoldingSetNodeID &ID, QualType ET, 2113 const llvm::APInt &ArraySize, ArraySizeModifier SizeMod, 2114 unsigned TypeQuals) { 2115 ID.AddPointer(ET.getAsOpaquePtr()); 2116 ID.AddInteger(ArraySize.getZExtValue()); 2117 ID.AddInteger(SizeMod); 2118 ID.AddInteger(TypeQuals); 2119 } 2120 static bool classof(const Type *T) { 2121 return T->getTypeClass() == ConstantArray; 2122 } 2123 static bool classof(const ConstantArrayType *) { return true; } 2124}; 2125 2126/// IncompleteArrayType - This class represents C arrays with an unspecified 2127/// size. For example 'int A[]' has an IncompleteArrayType where the element 2128/// type is 'int' and the size is unspecified. 2129class IncompleteArrayType : public ArrayType { 2130 2131 IncompleteArrayType(QualType et, QualType can, 2132 ArraySizeModifier sm, unsigned tq) 2133 : ArrayType(IncompleteArray, et, can, sm, tq, 2134 et->containsUnexpandedParameterPack()) {} 2135 friend class ASTContext; // ASTContext creates these. 2136public: 2137 bool isSugared() const { return false; } 2138 QualType desugar() const { return QualType(this, 0); } 2139 2140 static bool classof(const Type *T) { 2141 return T->getTypeClass() == IncompleteArray; 2142 } 2143 static bool classof(const IncompleteArrayType *) { return true; } 2144 2145 friend class StmtIteratorBase; 2146 2147 void Profile(llvm::FoldingSetNodeID &ID) { 2148 Profile(ID, getElementType(), getSizeModifier(), 2149 getIndexTypeCVRQualifiers()); 2150 } 2151 2152 static void Profile(llvm::FoldingSetNodeID &ID, QualType ET, 2153 ArraySizeModifier SizeMod, unsigned TypeQuals) { 2154 ID.AddPointer(ET.getAsOpaquePtr()); 2155 ID.AddInteger(SizeMod); 2156 ID.AddInteger(TypeQuals); 2157 } 2158}; 2159 2160/// VariableArrayType - This class represents C arrays with a specified size 2161/// which is not an integer-constant-expression. For example, 'int s[x+foo()]'. 2162/// Since the size expression is an arbitrary expression, we store it as such. 2163/// 2164/// Note: VariableArrayType's aren't uniqued (since the expressions aren't) and 2165/// should not be: two lexically equivalent variable array types could mean 2166/// different things, for example, these variables do not have the same type 2167/// dynamically: 2168/// 2169/// void foo(int x) { 2170/// int Y[x]; 2171/// ++x; 2172/// int Z[x]; 2173/// } 2174/// 2175class VariableArrayType : public ArrayType { 2176 /// SizeExpr - An assignment expression. VLA's are only permitted within 2177 /// a function block. 2178 Stmt *SizeExpr; 2179 /// Brackets - The left and right array brackets. 2180 SourceRange Brackets; 2181 2182 VariableArrayType(QualType et, QualType can, Expr *e, 2183 ArraySizeModifier sm, unsigned tq, 2184 SourceRange brackets) 2185 : ArrayType(VariableArray, et, can, sm, tq, 2186 et->containsUnexpandedParameterPack()), 2187 SizeExpr((Stmt*) e), Brackets(brackets) {} 2188 friend class ASTContext; // ASTContext creates these. 2189 2190public: 2191 Expr *getSizeExpr() const { 2192 // We use C-style casts instead of cast<> here because we do not wish 2193 // to have a dependency of Type.h on Stmt.h/Expr.h. 2194 return (Expr*) SizeExpr; 2195 } 2196 SourceRange getBracketsRange() const { return Brackets; } 2197 SourceLocation getLBracketLoc() const { return Brackets.getBegin(); } 2198 SourceLocation getRBracketLoc() const { return Brackets.getEnd(); } 2199 2200 bool isSugared() const { return false; } 2201 QualType desugar() const { return QualType(this, 0); } 2202 2203 static bool classof(const Type *T) { 2204 return T->getTypeClass() == VariableArray; 2205 } 2206 static bool classof(const VariableArrayType *) { return true; } 2207 2208 friend class StmtIteratorBase; 2209 2210 void Profile(llvm::FoldingSetNodeID &ID) { 2211 llvm_unreachable("Cannot unique VariableArrayTypes."); 2212 } 2213}; 2214 2215/// DependentSizedArrayType - This type represents an array type in 2216/// C++ whose size is a value-dependent expression. For example: 2217/// 2218/// \code 2219/// template<typename T, int Size> 2220/// class array { 2221/// T data[Size]; 2222/// }; 2223/// \endcode 2224/// 2225/// For these types, we won't actually know what the array bound is 2226/// until template instantiation occurs, at which point this will 2227/// become either a ConstantArrayType or a VariableArrayType. 2228class DependentSizedArrayType : public ArrayType { 2229 const ASTContext &Context; 2230 2231 /// \brief An assignment expression that will instantiate to the 2232 /// size of the array. 2233 /// 2234 /// The expression itself might be NULL, in which case the array 2235 /// type will have its size deduced from an initializer. 2236 Stmt *SizeExpr; 2237 2238 /// Brackets - The left and right array brackets. 2239 SourceRange Brackets; 2240 2241 DependentSizedArrayType(const ASTContext &Context, QualType et, QualType can, 2242 Expr *e, ArraySizeModifier sm, unsigned tq, 2243 SourceRange brackets); 2244 2245 friend class ASTContext; // ASTContext creates these. 2246 2247public: 2248 Expr *getSizeExpr() const { 2249 // We use C-style casts instead of cast<> here because we do not wish 2250 // to have a dependency of Type.h on Stmt.h/Expr.h. 2251 return (Expr*) SizeExpr; 2252 } 2253 SourceRange getBracketsRange() const { return Brackets; } 2254 SourceLocation getLBracketLoc() const { return Brackets.getBegin(); } 2255 SourceLocation getRBracketLoc() const { return Brackets.getEnd(); } 2256 2257 bool isSugared() const { return false; } 2258 QualType desugar() const { return QualType(this, 0); } 2259 2260 static bool classof(const Type *T) { 2261 return T->getTypeClass() == DependentSizedArray; 2262 } 2263 static bool classof(const DependentSizedArrayType *) { return true; } 2264 2265 friend class StmtIteratorBase; 2266 2267 2268 void Profile(llvm::FoldingSetNodeID &ID) { 2269 Profile(ID, Context, getElementType(), 2270 getSizeModifier(), getIndexTypeCVRQualifiers(), getSizeExpr()); 2271 } 2272 2273 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context, 2274 QualType ET, ArraySizeModifier SizeMod, 2275 unsigned TypeQuals, Expr *E); 2276}; 2277 2278/// DependentSizedExtVectorType - This type represent an extended vector type 2279/// where either the type or size is dependent. For example: 2280/// @code 2281/// template<typename T, int Size> 2282/// class vector { 2283/// typedef T __attribute__((ext_vector_type(Size))) type; 2284/// } 2285/// @endcode 2286class DependentSizedExtVectorType : public Type, public llvm::FoldingSetNode { 2287 const ASTContext &Context; 2288 Expr *SizeExpr; 2289 /// ElementType - The element type of the array. 2290 QualType ElementType; 2291 SourceLocation loc; 2292 2293 DependentSizedExtVectorType(const ASTContext &Context, QualType ElementType, 2294 QualType can, Expr *SizeExpr, SourceLocation loc); 2295 2296 friend class ASTContext; 2297 2298public: 2299 Expr *getSizeExpr() const { return SizeExpr; } 2300 QualType getElementType() const { return ElementType; } 2301 SourceLocation getAttributeLoc() const { return loc; } 2302 2303 bool isSugared() const { return false; } 2304 QualType desugar() const { return QualType(this, 0); } 2305 2306 static bool classof(const Type *T) { 2307 return T->getTypeClass() == DependentSizedExtVector; 2308 } 2309 static bool classof(const DependentSizedExtVectorType *) { return true; } 2310 2311 void Profile(llvm::FoldingSetNodeID &ID) { 2312 Profile(ID, Context, getElementType(), getSizeExpr()); 2313 } 2314 2315 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context, 2316 QualType ElementType, Expr *SizeExpr); 2317}; 2318 2319 2320/// VectorType - GCC generic vector type. This type is created using 2321/// __attribute__((vector_size(n)), where "n" specifies the vector size in 2322/// bytes; or from an Altivec __vector or vector declaration. 2323/// Since the constructor takes the number of vector elements, the 2324/// client is responsible for converting the size into the number of elements. 2325class VectorType : public Type, public llvm::FoldingSetNode { 2326public: 2327 enum VectorKind { 2328 GenericVector, // not a target-specific vector type 2329 AltiVecVector, // is AltiVec vector 2330 AltiVecPixel, // is AltiVec 'vector Pixel' 2331 AltiVecBool, // is AltiVec 'vector bool ...' 2332 NeonVector, // is ARM Neon vector 2333 NeonPolyVector // is ARM Neon polynomial vector 2334 }; 2335protected: 2336 /// ElementType - The element type of the vector. 2337 QualType ElementType; 2338 2339 VectorType(QualType vecType, unsigned nElements, QualType canonType, 2340 VectorKind vecKind); 2341 2342 VectorType(TypeClass tc, QualType vecType, unsigned nElements, 2343 QualType canonType, VectorKind vecKind); 2344 2345 friend class ASTContext; // ASTContext creates these. 2346 2347public: 2348 2349 QualType getElementType() const { return ElementType; } 2350 unsigned getNumElements() const { return VectorTypeBits.NumElements; } 2351 2352 bool isSugared() const { return false; } 2353 QualType desugar() const { return QualType(this, 0); } 2354 2355 VectorKind getVectorKind() const { 2356 return VectorKind(VectorTypeBits.VecKind); 2357 } 2358 2359 void Profile(llvm::FoldingSetNodeID &ID) { 2360 Profile(ID, getElementType(), getNumElements(), 2361 getTypeClass(), getVectorKind()); 2362 } 2363 static void Profile(llvm::FoldingSetNodeID &ID, QualType ElementType, 2364 unsigned NumElements, TypeClass TypeClass, 2365 VectorKind VecKind) { 2366 ID.AddPointer(ElementType.getAsOpaquePtr()); 2367 ID.AddInteger(NumElements); 2368 ID.AddInteger(TypeClass); 2369 ID.AddInteger(VecKind); 2370 } 2371 2372 static bool classof(const Type *T) { 2373 return T->getTypeClass() == Vector || T->getTypeClass() == ExtVector; 2374 } 2375 static bool classof(const VectorType *) { return true; } 2376}; 2377 2378/// ExtVectorType - Extended vector type. This type is created using 2379/// __attribute__((ext_vector_type(n)), where "n" is the number of elements. 2380/// Unlike vector_size, ext_vector_type is only allowed on typedef's. This 2381/// class enables syntactic extensions, like Vector Components for accessing 2382/// points, colors, and textures (modeled after OpenGL Shading Language). 2383class ExtVectorType : public VectorType { 2384 ExtVectorType(QualType vecType, unsigned nElements, QualType canonType) : 2385 VectorType(ExtVector, vecType, nElements, canonType, GenericVector) {} 2386 friend class ASTContext; // ASTContext creates these. 2387public: 2388 static int getPointAccessorIdx(char c) { 2389 switch (c) { 2390 default: return -1; 2391 case 'x': return 0; 2392 case 'y': return 1; 2393 case 'z': return 2; 2394 case 'w': return 3; 2395 } 2396 } 2397 static int getNumericAccessorIdx(char c) { 2398 switch (c) { 2399 default: return -1; 2400 case '0': return 0; 2401 case '1': return 1; 2402 case '2': return 2; 2403 case '3': return 3; 2404 case '4': return 4; 2405 case '5': return 5; 2406 case '6': return 6; 2407 case '7': return 7; 2408 case '8': return 8; 2409 case '9': return 9; 2410 case 'A': 2411 case 'a': return 10; 2412 case 'B': 2413 case 'b': return 11; 2414 case 'C': 2415 case 'c': return 12; 2416 case 'D': 2417 case 'd': return 13; 2418 case 'E': 2419 case 'e': return 14; 2420 case 'F': 2421 case 'f': return 15; 2422 } 2423 } 2424 2425 static int getAccessorIdx(char c) { 2426 if (int idx = getPointAccessorIdx(c)+1) return idx-1; 2427 return getNumericAccessorIdx(c); 2428 } 2429 2430 bool isAccessorWithinNumElements(char c) const { 2431 if (int idx = getAccessorIdx(c)+1) 2432 return unsigned(idx-1) < getNumElements(); 2433 return false; 2434 } 2435 bool isSugared() const { return false; } 2436 QualType desugar() const { return QualType(this, 0); } 2437 2438 static bool classof(const Type *T) { 2439 return T->getTypeClass() == ExtVector; 2440 } 2441 static bool classof(const ExtVectorType *) { return true; } 2442}; 2443 2444/// FunctionType - C99 6.7.5.3 - Function Declarators. This is the common base 2445/// class of FunctionNoProtoType and FunctionProtoType. 2446/// 2447class FunctionType : public Type { 2448 // The type returned by the function. 2449 QualType ResultType; 2450 2451 public: 2452 /// ExtInfo - A class which abstracts out some details necessary for 2453 /// making a call. 2454 /// 2455 /// It is not actually used directly for storing this information in 2456 /// a FunctionType, although FunctionType does currently use the 2457 /// same bit-pattern. 2458 /// 2459 // If you add a field (say Foo), other than the obvious places (both, 2460 // constructors, compile failures), what you need to update is 2461 // * Operator== 2462 // * getFoo 2463 // * withFoo 2464 // * functionType. Add Foo, getFoo. 2465 // * ASTContext::getFooType 2466 // * ASTContext::mergeFunctionTypes 2467 // * FunctionNoProtoType::Profile 2468 // * FunctionProtoType::Profile 2469 // * TypePrinter::PrintFunctionProto 2470 // * AST read and write 2471 // * Codegen 2472 class ExtInfo { 2473 // Feel free to rearrange or add bits, but if you go over 8, 2474 // you'll need to adjust both the Bits field below and 2475 // Type::FunctionTypeBitfields. 2476 2477 // | CC |noreturn|produces|regparm| 2478 // |0 .. 2| 3 | 4 | 5 .. 7| 2479 // 2480 // regparm is either 0 (no regparm attribute) or the regparm value+1. 2481 enum { CallConvMask = 0x7 }; 2482 enum { NoReturnMask = 0x8 }; 2483 enum { ProducesResultMask = 0x10 }; 2484 enum { RegParmMask = ~(CallConvMask | NoReturnMask | ProducesResultMask), 2485 RegParmOffset = 5 }; // Assumed to be the last field 2486 2487 uint16_t Bits; 2488 2489 ExtInfo(unsigned Bits) : Bits(static_cast<uint16_t>(Bits)) {} 2490 2491 friend class FunctionType; 2492 2493 public: 2494 // Constructor with no defaults. Use this when you know that you 2495 // have all the elements (when reading an AST file for example). 2496 ExtInfo(bool noReturn, bool hasRegParm, unsigned regParm, CallingConv cc, 2497 bool producesResult) { 2498 assert((!hasRegParm || regParm < 7) && "Invalid regparm value"); 2499 Bits = ((unsigned) cc) | 2500 (noReturn ? NoReturnMask : 0) | 2501 (producesResult ? ProducesResultMask : 0) | 2502 (hasRegParm ? ((regParm + 1) << RegParmOffset) : 0); 2503 } 2504 2505 // Constructor with all defaults. Use when for example creating a 2506 // function know to use defaults. 2507 ExtInfo() : Bits(0) {} 2508 2509 bool getNoReturn() const { return Bits & NoReturnMask; } 2510 bool getProducesResult() const { return Bits & ProducesResultMask; } 2511 bool getHasRegParm() const { return (Bits >> RegParmOffset) != 0; } 2512 unsigned getRegParm() const { 2513 unsigned RegParm = Bits >> RegParmOffset; 2514 if (RegParm > 0) 2515 --RegParm; 2516 return RegParm; 2517 } 2518 CallingConv getCC() const { return CallingConv(Bits & CallConvMask); } 2519 2520 bool operator==(ExtInfo Other) const { 2521 return Bits == Other.Bits; 2522 } 2523 bool operator!=(ExtInfo Other) const { 2524 return Bits != Other.Bits; 2525 } 2526 2527 // Note that we don't have setters. That is by design, use 2528 // the following with methods instead of mutating these objects. 2529 2530 ExtInfo withNoReturn(bool noReturn) const { 2531 if (noReturn) 2532 return ExtInfo(Bits | NoReturnMask); 2533 else 2534 return ExtInfo(Bits & ~NoReturnMask); 2535 } 2536 2537 ExtInfo withProducesResult(bool producesResult) const { 2538 if (producesResult) 2539 return ExtInfo(Bits | ProducesResultMask); 2540 else 2541 return ExtInfo(Bits & ~ProducesResultMask); 2542 } 2543 2544 ExtInfo withRegParm(unsigned RegParm) const { 2545 assert(RegParm < 7 && "Invalid regparm value"); 2546 return ExtInfo((Bits & ~RegParmMask) | 2547 ((RegParm + 1) << RegParmOffset)); 2548 } 2549 2550 ExtInfo withCallingConv(CallingConv cc) const { 2551 return ExtInfo((Bits & ~CallConvMask) | (unsigned) cc); 2552 } 2553 2554 void Profile(llvm::FoldingSetNodeID &ID) const { 2555 ID.AddInteger(Bits); 2556 } 2557 }; 2558 2559protected: 2560 FunctionType(TypeClass tc, QualType res, bool variadic, 2561 unsigned typeQuals, RefQualifierKind RefQualifier, 2562 QualType Canonical, bool Dependent, 2563 bool InstantiationDependent, 2564 bool VariablyModified, bool ContainsUnexpandedParameterPack, 2565 ExtInfo Info) 2566 : Type(tc, Canonical, Dependent, InstantiationDependent, VariablyModified, 2567 ContainsUnexpandedParameterPack), 2568 ResultType(res) { 2569 FunctionTypeBits.ExtInfo = Info.Bits; 2570 FunctionTypeBits.Variadic = variadic; 2571 FunctionTypeBits.TypeQuals = typeQuals; 2572 FunctionTypeBits.RefQualifier = static_cast<unsigned>(RefQualifier); 2573 } 2574 bool isVariadic() const { return FunctionTypeBits.Variadic; } 2575 unsigned getTypeQuals() const { return FunctionTypeBits.TypeQuals; } 2576 2577 RefQualifierKind getRefQualifier() const { 2578 return static_cast<RefQualifierKind>(FunctionTypeBits.RefQualifier); 2579 } 2580 2581public: 2582 2583 QualType getResultType() const { return ResultType; } 2584 2585 bool getHasRegParm() const { return getExtInfo().getHasRegParm(); } 2586 unsigned getRegParmType() const { return getExtInfo().getRegParm(); } 2587 bool getNoReturnAttr() const { return getExtInfo().getNoReturn(); } 2588 CallingConv getCallConv() const { return getExtInfo().getCC(); } 2589 ExtInfo getExtInfo() const { return ExtInfo(FunctionTypeBits.ExtInfo); } 2590 2591 /// \brief Determine the type of an expression that calls a function of 2592 /// this type. 2593 QualType getCallResultType(ASTContext &Context) const { 2594 return getResultType().getNonLValueExprType(Context); 2595 } 2596 2597 static StringRef getNameForCallConv(CallingConv CC); 2598 2599 static bool classof(const Type *T) { 2600 return T->getTypeClass() == FunctionNoProto || 2601 T->getTypeClass() == FunctionProto; 2602 } 2603 static bool classof(const FunctionType *) { return true; } 2604}; 2605 2606/// FunctionNoProtoType - Represents a K&R-style 'int foo()' function, which has 2607/// no information available about its arguments. 2608class FunctionNoProtoType : public FunctionType, public llvm::FoldingSetNode { 2609 FunctionNoProtoType(QualType Result, QualType Canonical, ExtInfo Info) 2610 : FunctionType(FunctionNoProto, Result, false, 0, RQ_None, Canonical, 2611 /*Dependent=*/false, /*InstantiationDependent=*/false, 2612 Result->isVariablyModifiedType(), 2613 /*ContainsUnexpandedParameterPack=*/false, Info) {} 2614 2615 friend class ASTContext; // ASTContext creates these. 2616 2617public: 2618 // No additional state past what FunctionType provides. 2619 2620 bool isSugared() const { return false; } 2621 QualType desugar() const { return QualType(this, 0); } 2622 2623 void Profile(llvm::FoldingSetNodeID &ID) { 2624 Profile(ID, getResultType(), getExtInfo()); 2625 } 2626 static void Profile(llvm::FoldingSetNodeID &ID, QualType ResultType, 2627 ExtInfo Info) { 2628 Info.Profile(ID); 2629 ID.AddPointer(ResultType.getAsOpaquePtr()); 2630 } 2631 2632 static bool classof(const Type *T) { 2633 return T->getTypeClass() == FunctionNoProto; 2634 } 2635 static bool classof(const FunctionNoProtoType *) { return true; } 2636}; 2637 2638/// FunctionProtoType - Represents a prototype with argument type info, e.g. 2639/// 'int foo(int)' or 'int foo(void)'. 'void' is represented as having no 2640/// arguments, not as having a single void argument. Such a type can have an 2641/// exception specification, but this specification is not part of the canonical 2642/// type. 2643class FunctionProtoType : public FunctionType, public llvm::FoldingSetNode { 2644public: 2645 /// ExtProtoInfo - Extra information about a function prototype. 2646 struct ExtProtoInfo { 2647 ExtProtoInfo() : 2648 Variadic(false), ExceptionSpecType(EST_None), TypeQuals(0), 2649 RefQualifier(RQ_None), NumExceptions(0), Exceptions(0), NoexceptExpr(0), 2650 ConsumedArguments(0) {} 2651 2652 FunctionType::ExtInfo ExtInfo; 2653 bool Variadic; 2654 ExceptionSpecificationType ExceptionSpecType; 2655 unsigned char TypeQuals; 2656 RefQualifierKind RefQualifier; 2657 unsigned NumExceptions; 2658 const QualType *Exceptions; 2659 Expr *NoexceptExpr; 2660 const bool *ConsumedArguments; 2661 }; 2662 2663private: 2664 /// \brief Determine whether there are any argument types that 2665 /// contain an unexpanded parameter pack. 2666 static bool containsAnyUnexpandedParameterPack(const QualType *ArgArray, 2667 unsigned numArgs) { 2668 for (unsigned Idx = 0; Idx < numArgs; ++Idx) 2669 if (ArgArray[Idx]->containsUnexpandedParameterPack()) 2670 return true; 2671 2672 return false; 2673 } 2674 2675 FunctionProtoType(QualType result, const QualType *args, unsigned numArgs, 2676 QualType canonical, const ExtProtoInfo &epi); 2677 2678 /// NumArgs - The number of arguments this function has, not counting '...'. 2679 unsigned NumArgs : 19; 2680 2681 /// NumExceptions - The number of types in the exception spec, if any. 2682 unsigned NumExceptions : 9; 2683 2684 /// ExceptionSpecType - The type of exception specification this function has. 2685 unsigned ExceptionSpecType : 3; 2686 2687 /// HasAnyConsumedArgs - Whether this function has any consumed arguments. 2688 unsigned HasAnyConsumedArgs : 1; 2689 2690 // ArgInfo - There is an variable size array after the class in memory that 2691 // holds the argument types. 2692 2693 // Exceptions - There is another variable size array after ArgInfo that 2694 // holds the exception types. 2695 2696 // NoexceptExpr - Instead of Exceptions, there may be a single Expr* pointing 2697 // to the expression in the noexcept() specifier. 2698 2699 // ConsumedArgs - A variable size array, following Exceptions 2700 // and of length NumArgs, holding flags indicating which arguments 2701 // are consumed. This only appears if HasAnyConsumedArgs is true. 2702 2703 friend class ASTContext; // ASTContext creates these. 2704 2705 const bool *getConsumedArgsBuffer() const { 2706 assert(hasAnyConsumedArgs()); 2707 2708 // Find the end of the exceptions. 2709 Expr * const *eh_end = reinterpret_cast<Expr * const *>(arg_type_end()); 2710 if (getExceptionSpecType() != EST_ComputedNoexcept) 2711 eh_end += NumExceptions; 2712 else 2713 eh_end += 1; // NoexceptExpr 2714 2715 return reinterpret_cast<const bool*>(eh_end); 2716 } 2717 2718public: 2719 unsigned getNumArgs() const { return NumArgs; } 2720 QualType getArgType(unsigned i) const { 2721 assert(i < NumArgs && "Invalid argument number!"); 2722 return arg_type_begin()[i]; 2723 } 2724 2725 ExtProtoInfo getExtProtoInfo() const { 2726 ExtProtoInfo EPI; 2727 EPI.ExtInfo = getExtInfo(); 2728 EPI.Variadic = isVariadic(); 2729 EPI.ExceptionSpecType = getExceptionSpecType(); 2730 EPI.TypeQuals = static_cast<unsigned char>(getTypeQuals()); 2731 EPI.RefQualifier = getRefQualifier(); 2732 if (EPI.ExceptionSpecType == EST_Dynamic) { 2733 EPI.NumExceptions = NumExceptions; 2734 EPI.Exceptions = exception_begin(); 2735 } else if (EPI.ExceptionSpecType == EST_ComputedNoexcept) { 2736 EPI.NoexceptExpr = getNoexceptExpr(); 2737 } 2738 if (hasAnyConsumedArgs()) 2739 EPI.ConsumedArguments = getConsumedArgsBuffer(); 2740 return EPI; 2741 } 2742 2743 /// \brief Get the kind of exception specification on this function. 2744 ExceptionSpecificationType getExceptionSpecType() const { 2745 return static_cast<ExceptionSpecificationType>(ExceptionSpecType); 2746 } 2747 /// \brief Return whether this function has any kind of exception spec. 2748 bool hasExceptionSpec() const { 2749 return getExceptionSpecType() != EST_None; 2750 } 2751 /// \brief Return whether this function has a dynamic (throw) exception spec. 2752 bool hasDynamicExceptionSpec() const { 2753 return isDynamicExceptionSpec(getExceptionSpecType()); 2754 } 2755 /// \brief Return whether this function has a noexcept exception spec. 2756 bool hasNoexceptExceptionSpec() const { 2757 return isNoexceptExceptionSpec(getExceptionSpecType()); 2758 } 2759 /// \brief Result type of getNoexceptSpec(). 2760 enum NoexceptResult { 2761 NR_NoNoexcept, ///< There is no noexcept specifier. 2762 NR_BadNoexcept, ///< The noexcept specifier has a bad expression. 2763 NR_Dependent, ///< The noexcept specifier is dependent. 2764 NR_Throw, ///< The noexcept specifier evaluates to false. 2765 NR_Nothrow ///< The noexcept specifier evaluates to true. 2766 }; 2767 /// \brief Get the meaning of the noexcept spec on this function, if any. 2768 NoexceptResult getNoexceptSpec(ASTContext &Ctx) const; 2769 unsigned getNumExceptions() const { return NumExceptions; } 2770 QualType getExceptionType(unsigned i) const { 2771 assert(i < NumExceptions && "Invalid exception number!"); 2772 return exception_begin()[i]; 2773 } 2774 Expr *getNoexceptExpr() const { 2775 if (getExceptionSpecType() != EST_ComputedNoexcept) 2776 return 0; 2777 // NoexceptExpr sits where the arguments end. 2778 return *reinterpret_cast<Expr *const *>(arg_type_end()); 2779 } 2780 bool isNothrow(ASTContext &Ctx) const { 2781 ExceptionSpecificationType EST = getExceptionSpecType(); 2782 assert(EST != EST_Delayed); 2783 if (EST == EST_DynamicNone || EST == EST_BasicNoexcept) 2784 return true; 2785 if (EST != EST_ComputedNoexcept) 2786 return false; 2787 return getNoexceptSpec(Ctx) == NR_Nothrow; 2788 } 2789 2790 using FunctionType::isVariadic; 2791 2792 /// \brief Determines whether this function prototype contains a 2793 /// parameter pack at the end. 2794 /// 2795 /// A function template whose last parameter is a parameter pack can be 2796 /// called with an arbitrary number of arguments, much like a variadic 2797 /// function. However, 2798 bool isTemplateVariadic() const; 2799 2800 unsigned getTypeQuals() const { return FunctionType::getTypeQuals(); } 2801 2802 2803 /// \brief Retrieve the ref-qualifier associated with this function type. 2804 RefQualifierKind getRefQualifier() const { 2805 return FunctionType::getRefQualifier(); 2806 } 2807 2808 typedef const QualType *arg_type_iterator; 2809 arg_type_iterator arg_type_begin() const { 2810 return reinterpret_cast<const QualType *>(this+1); 2811 } 2812 arg_type_iterator arg_type_end() const { return arg_type_begin()+NumArgs; } 2813 2814 typedef const QualType *exception_iterator; 2815 exception_iterator exception_begin() const { 2816 // exceptions begin where arguments end 2817 return arg_type_end(); 2818 } 2819 exception_iterator exception_end() const { 2820 if (getExceptionSpecType() != EST_Dynamic) 2821 return exception_begin(); 2822 return exception_begin() + NumExceptions; 2823 } 2824 2825 bool hasAnyConsumedArgs() const { 2826 return HasAnyConsumedArgs; 2827 } 2828 bool isArgConsumed(unsigned I) const { 2829 assert(I < getNumArgs() && "argument index out of range!"); 2830 if (hasAnyConsumedArgs()) 2831 return getConsumedArgsBuffer()[I]; 2832 return false; 2833 } 2834 2835 bool isSugared() const { return false; } 2836 QualType desugar() const { return QualType(this, 0); } 2837 2838 static bool classof(const Type *T) { 2839 return T->getTypeClass() == FunctionProto; 2840 } 2841 static bool classof(const FunctionProtoType *) { return true; } 2842 2843 void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Ctx); 2844 static void Profile(llvm::FoldingSetNodeID &ID, QualType Result, 2845 arg_type_iterator ArgTys, unsigned NumArgs, 2846 const ExtProtoInfo &EPI, const ASTContext &Context); 2847}; 2848 2849 2850/// \brief Represents the dependent type named by a dependently-scoped 2851/// typename using declaration, e.g. 2852/// using typename Base<T>::foo; 2853/// Template instantiation turns these into the underlying type. 2854class UnresolvedUsingType : public Type { 2855 UnresolvedUsingTypenameDecl *Decl; 2856 2857 UnresolvedUsingType(const UnresolvedUsingTypenameDecl *D) 2858 : Type(UnresolvedUsing, QualType(), true, true, false, 2859 /*ContainsUnexpandedParameterPack=*/false), 2860 Decl(const_cast<UnresolvedUsingTypenameDecl*>(D)) {} 2861 friend class ASTContext; // ASTContext creates these. 2862public: 2863 2864 UnresolvedUsingTypenameDecl *getDecl() const { return Decl; } 2865 2866 bool isSugared() const { return false; } 2867 QualType desugar() const { return QualType(this, 0); } 2868 2869 static bool classof(const Type *T) { 2870 return T->getTypeClass() == UnresolvedUsing; 2871 } 2872 static bool classof(const UnresolvedUsingType *) { return true; } 2873 2874 void Profile(llvm::FoldingSetNodeID &ID) { 2875 return Profile(ID, Decl); 2876 } 2877 static void Profile(llvm::FoldingSetNodeID &ID, 2878 UnresolvedUsingTypenameDecl *D) { 2879 ID.AddPointer(D); 2880 } 2881}; 2882 2883 2884class TypedefType : public Type { 2885 TypedefNameDecl *Decl; 2886protected: 2887 TypedefType(TypeClass tc, const TypedefNameDecl *D, QualType can) 2888 : Type(tc, can, can->isDependentType(), 2889 can->isInstantiationDependentType(), 2890 can->isVariablyModifiedType(), 2891 /*ContainsUnexpandedParameterPack=*/false), 2892 Decl(const_cast<TypedefNameDecl*>(D)) { 2893 assert(!isa<TypedefType>(can) && "Invalid canonical type"); 2894 } 2895 friend class ASTContext; // ASTContext creates these. 2896public: 2897 2898 TypedefNameDecl *getDecl() const { return Decl; } 2899 2900 bool isSugared() const { return true; } 2901 QualType desugar() const; 2902 2903 static bool classof(const Type *T) { return T->getTypeClass() == Typedef; } 2904 static bool classof(const TypedefType *) { return true; } 2905}; 2906 2907/// TypeOfExprType (GCC extension). 2908class TypeOfExprType : public Type { 2909 Expr *TOExpr; 2910 2911protected: 2912 TypeOfExprType(Expr *E, QualType can = QualType()); 2913 friend class ASTContext; // ASTContext creates these. 2914public: 2915 Expr *getUnderlyingExpr() const { return TOExpr; } 2916 2917 /// \brief Remove a single level of sugar. 2918 QualType desugar() const; 2919 2920 /// \brief Returns whether this type directly provides sugar. 2921 bool isSugared() const; 2922 2923 static bool classof(const Type *T) { return T->getTypeClass() == TypeOfExpr; } 2924 static bool classof(const TypeOfExprType *) { return true; } 2925}; 2926 2927/// \brief Internal representation of canonical, dependent 2928/// typeof(expr) types. 2929/// 2930/// This class is used internally by the ASTContext to manage 2931/// canonical, dependent types, only. Clients will only see instances 2932/// of this class via TypeOfExprType nodes. 2933class DependentTypeOfExprType 2934 : public TypeOfExprType, public llvm::FoldingSetNode { 2935 const ASTContext &Context; 2936 2937public: 2938 DependentTypeOfExprType(const ASTContext &Context, Expr *E) 2939 : TypeOfExprType(E), Context(Context) { } 2940 2941 void Profile(llvm::FoldingSetNodeID &ID) { 2942 Profile(ID, Context, getUnderlyingExpr()); 2943 } 2944 2945 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context, 2946 Expr *E); 2947}; 2948 2949/// TypeOfType (GCC extension). 2950class TypeOfType : public Type { 2951 QualType TOType; 2952 TypeOfType(QualType T, QualType can) 2953 : Type(TypeOf, can, T->isDependentType(), 2954 T->isInstantiationDependentType(), 2955 T->isVariablyModifiedType(), 2956 T->containsUnexpandedParameterPack()), 2957 TOType(T) { 2958 assert(!isa<TypedefType>(can) && "Invalid canonical type"); 2959 } 2960 friend class ASTContext; // ASTContext creates these. 2961public: 2962 QualType getUnderlyingType() const { return TOType; } 2963 2964 /// \brief Remove a single level of sugar. 2965 QualType desugar() const { return getUnderlyingType(); } 2966 2967 /// \brief Returns whether this type directly provides sugar. 2968 bool isSugared() const { return true; } 2969 2970 static bool classof(const Type *T) { return T->getTypeClass() == TypeOf; } 2971 static bool classof(const TypeOfType *) { return true; } 2972}; 2973 2974/// DecltypeType (C++0x) 2975class DecltypeType : public Type { 2976 Expr *E; 2977 2978 // FIXME: We could get rid of UnderlyingType if we wanted to: We would have to 2979 // Move getDesugaredType to ASTContext so that it can call getDecltypeForExpr 2980 // from it. 2981 QualType UnderlyingType; 2982 2983protected: 2984 DecltypeType(Expr *E, QualType underlyingType, QualType can = QualType()); 2985 friend class ASTContext; // ASTContext creates these. 2986public: 2987 Expr *getUnderlyingExpr() const { return E; } 2988 QualType getUnderlyingType() const { return UnderlyingType; } 2989 2990 /// \brief Remove a single level of sugar. 2991 QualType desugar() const; 2992 2993 /// \brief Returns whether this type directly provides sugar. 2994 bool isSugared() const; 2995 2996 static bool classof(const Type *T) { return T->getTypeClass() == Decltype; } 2997 static bool classof(const DecltypeType *) { return true; } 2998}; 2999 3000/// \brief Internal representation of canonical, dependent 3001/// decltype(expr) types. 3002/// 3003/// This class is used internally by the ASTContext to manage 3004/// canonical, dependent types, only. Clients will only see instances 3005/// of this class via DecltypeType nodes. 3006class DependentDecltypeType : public DecltypeType, public llvm::FoldingSetNode { 3007 const ASTContext &Context; 3008 3009public: 3010 DependentDecltypeType(const ASTContext &Context, Expr *E); 3011 3012 void Profile(llvm::FoldingSetNodeID &ID) { 3013 Profile(ID, Context, getUnderlyingExpr()); 3014 } 3015 3016 static void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context, 3017 Expr *E); 3018}; 3019 3020/// \brief A unary type transform, which is a type constructed from another 3021class UnaryTransformType : public Type { 3022public: 3023 enum UTTKind { 3024 EnumUnderlyingType 3025 }; 3026 3027private: 3028 /// The untransformed type. 3029 QualType BaseType; 3030 /// The transformed type if not dependent, otherwise the same as BaseType. 3031 QualType UnderlyingType; 3032 3033 UTTKind UKind; 3034protected: 3035 UnaryTransformType(QualType BaseTy, QualType UnderlyingTy, UTTKind UKind, 3036 QualType CanonicalTy); 3037 friend class ASTContext; 3038public: 3039 bool isSugared() const { return !isDependentType(); } 3040 QualType desugar() const { return UnderlyingType; } 3041 3042 QualType getUnderlyingType() const { return UnderlyingType; } 3043 QualType getBaseType() const { return BaseType; } 3044 3045 UTTKind getUTTKind() const { return UKind; } 3046 3047 static bool classof(const Type *T) { 3048 return T->getTypeClass() == UnaryTransform; 3049 } 3050 static bool classof(const UnaryTransformType *) { return true; } 3051}; 3052 3053class TagType : public Type { 3054 /// Stores the TagDecl associated with this type. The decl may point to any 3055 /// TagDecl that declares the entity. 3056 TagDecl * decl; 3057 3058protected: 3059 TagType(TypeClass TC, const TagDecl *D, QualType can); 3060 3061public: 3062 TagDecl *getDecl() const; 3063 3064 /// @brief Determines whether this type is in the process of being 3065 /// defined. 3066 bool isBeingDefined() const; 3067 3068 static bool classof(const Type *T) { 3069 return T->getTypeClass() >= TagFirst && T->getTypeClass() <= TagLast; 3070 } 3071 static bool classof(const TagType *) { return true; } 3072 static bool classof(const RecordType *) { return true; } 3073 static bool classof(const EnumType *) { return true; } 3074}; 3075 3076/// RecordType - This is a helper class that allows the use of isa/cast/dyncast 3077/// to detect TagType objects of structs/unions/classes. 3078class RecordType : public TagType { 3079protected: 3080 explicit RecordType(const RecordDecl *D) 3081 : TagType(Record, reinterpret_cast<const TagDecl*>(D), QualType()) { } 3082 explicit RecordType(TypeClass TC, RecordDecl *D) 3083 : TagType(TC, reinterpret_cast<const TagDecl*>(D), QualType()) { } 3084 friend class ASTContext; // ASTContext creates these. 3085public: 3086 3087 RecordDecl *getDecl() const { 3088 return reinterpret_cast<RecordDecl*>(TagType::getDecl()); 3089 } 3090 3091 // FIXME: This predicate is a helper to QualType/Type. It needs to 3092 // recursively check all fields for const-ness. If any field is declared 3093 // const, it needs to return false. 3094 bool hasConstFields() const { return false; } 3095 3096 bool isSugared() const { return false; } 3097 QualType desugar() const { return QualType(this, 0); } 3098 3099 static bool classof(const TagType *T); 3100 static bool classof(const Type *T) { 3101 return isa<TagType>(T) && classof(cast<TagType>(T)); 3102 } 3103 static bool classof(const RecordType *) { return true; } 3104}; 3105 3106/// EnumType - This is a helper class that allows the use of isa/cast/dyncast 3107/// to detect TagType objects of enums. 3108class EnumType : public TagType { 3109 explicit EnumType(const EnumDecl *D) 3110 : TagType(Enum, reinterpret_cast<const TagDecl*>(D), QualType()) { } 3111 friend class ASTContext; // ASTContext creates these. 3112public: 3113 3114 EnumDecl *getDecl() const { 3115 return reinterpret_cast<EnumDecl*>(TagType::getDecl()); 3116 } 3117 3118 bool isSugared() const { return false; } 3119 QualType desugar() const { return QualType(this, 0); } 3120 3121 static bool classof(const TagType *T); 3122 static bool classof(const Type *T) { 3123 return isa<TagType>(T) && classof(cast<TagType>(T)); 3124 } 3125 static bool classof(const EnumType *) { return true; } 3126}; 3127 3128/// AttributedType - An attributed type is a type to which a type 3129/// attribute has been applied. The "modified type" is the 3130/// fully-sugared type to which the attributed type was applied; 3131/// generally it is not canonically equivalent to the attributed type. 3132/// The "equivalent type" is the minimally-desugared type which the 3133/// type is canonically equivalent to. 3134/// 3135/// For example, in the following attributed type: 3136/// int32_t __attribute__((vector_size(16))) 3137/// - the modified type is the TypedefType for int32_t 3138/// - the equivalent type is VectorType(16, int32_t) 3139/// - the canonical type is VectorType(16, int) 3140class AttributedType : public Type, public llvm::FoldingSetNode { 3141public: 3142 // It is really silly to have yet another attribute-kind enum, but 3143 // clang::attr::Kind doesn't currently cover the pure type attrs. 3144 enum Kind { 3145 // Expression operand. 3146 attr_address_space, 3147 attr_regparm, 3148 attr_vector_size, 3149 attr_neon_vector_type, 3150 attr_neon_polyvector_type, 3151 3152 FirstExprOperandKind = attr_address_space, 3153 LastExprOperandKind = attr_neon_polyvector_type, 3154 3155 // Enumerated operand (string or keyword). 3156 attr_objc_gc, 3157 attr_objc_ownership, 3158 attr_pcs, 3159 3160 FirstEnumOperandKind = attr_objc_gc, 3161 LastEnumOperandKind = attr_pcs, 3162 3163 // No operand. 3164 attr_noreturn, 3165 attr_cdecl, 3166 attr_fastcall, 3167 attr_stdcall, 3168 attr_thiscall, 3169 attr_pascal 3170 }; 3171 3172private: 3173 QualType ModifiedType; 3174 QualType EquivalentType; 3175 3176 friend class ASTContext; // creates these 3177 3178 AttributedType(QualType canon, Kind attrKind, 3179 QualType modified, QualType equivalent) 3180 : Type(Attributed, canon, canon->isDependentType(), 3181 canon->isInstantiationDependentType(), 3182 canon->isVariablyModifiedType(), 3183 canon->containsUnexpandedParameterPack()), 3184 ModifiedType(modified), EquivalentType(equivalent) { 3185 AttributedTypeBits.AttrKind = attrKind; 3186 } 3187 3188public: 3189 Kind getAttrKind() const { 3190 return static_cast<Kind>(AttributedTypeBits.AttrKind); 3191 } 3192 3193 QualType getModifiedType() const { return ModifiedType; } 3194 QualType getEquivalentType() const { return EquivalentType; } 3195 3196 bool isSugared() const { return true; } 3197 QualType desugar() const { return getEquivalentType(); } 3198 3199 void Profile(llvm::FoldingSetNodeID &ID) { 3200 Profile(ID, getAttrKind(), ModifiedType, EquivalentType); 3201 } 3202 3203 static void Profile(llvm::FoldingSetNodeID &ID, Kind attrKind, 3204 QualType modified, QualType equivalent) { 3205 ID.AddInteger(attrKind); 3206 ID.AddPointer(modified.getAsOpaquePtr()); 3207 ID.AddPointer(equivalent.getAsOpaquePtr()); 3208 } 3209 3210 static bool classof(const Type *T) { 3211 return T->getTypeClass() == Attributed; 3212 } 3213 static bool classof(const AttributedType *T) { return true; } 3214}; 3215 3216class TemplateTypeParmType : public Type, public llvm::FoldingSetNode { 3217 // Helper data collector for canonical types. 3218 struct CanonicalTTPTInfo { 3219 unsigned Depth : 15; 3220 unsigned ParameterPack : 1; 3221 unsigned Index : 16; 3222 }; 3223 3224 union { 3225 // Info for the canonical type. 3226 CanonicalTTPTInfo CanTTPTInfo; 3227 // Info for the non-canonical type. 3228 TemplateTypeParmDecl *TTPDecl; 3229 }; 3230 3231 /// Build a non-canonical type. 3232 TemplateTypeParmType(TemplateTypeParmDecl *TTPDecl, QualType Canon) 3233 : Type(TemplateTypeParm, Canon, /*Dependent=*/true, 3234 /*InstantiationDependent=*/true, 3235 /*VariablyModified=*/false, 3236 Canon->containsUnexpandedParameterPack()), 3237 TTPDecl(TTPDecl) { } 3238 3239 /// Build the canonical type. 3240 TemplateTypeParmType(unsigned D, unsigned I, bool PP) 3241 : Type(TemplateTypeParm, QualType(this, 0), 3242 /*Dependent=*/true, 3243 /*InstantiationDependent=*/true, 3244 /*VariablyModified=*/false, PP) { 3245 CanTTPTInfo.Depth = D; 3246 CanTTPTInfo.Index = I; 3247 CanTTPTInfo.ParameterPack = PP; 3248 } 3249 3250 friend class ASTContext; // ASTContext creates these 3251 3252 const CanonicalTTPTInfo& getCanTTPTInfo() const { 3253 QualType Can = getCanonicalTypeInternal(); 3254 return Can->castAs<TemplateTypeParmType>()->CanTTPTInfo; 3255 } 3256 3257public: 3258 unsigned getDepth() const { return getCanTTPTInfo().Depth; } 3259 unsigned getIndex() const { return getCanTTPTInfo().Index; } 3260 bool isParameterPack() const { return getCanTTPTInfo().ParameterPack; } 3261 3262 TemplateTypeParmDecl *getDecl() const { 3263 return isCanonicalUnqualified() ? 0 : TTPDecl; 3264 } 3265 3266 IdentifierInfo *getIdentifier() const; 3267 3268 bool isSugared() const { return false; } 3269 QualType desugar() const { return QualType(this, 0); } 3270 3271 void Profile(llvm::FoldingSetNodeID &ID) { 3272 Profile(ID, getDepth(), getIndex(), isParameterPack(), getDecl()); 3273 } 3274 3275 static void Profile(llvm::FoldingSetNodeID &ID, unsigned Depth, 3276 unsigned Index, bool ParameterPack, 3277 TemplateTypeParmDecl *TTPDecl) { 3278 ID.AddInteger(Depth); 3279 ID.AddInteger(Index); 3280 ID.AddBoolean(ParameterPack); 3281 ID.AddPointer(TTPDecl); 3282 } 3283 3284 static bool classof(const Type *T) { 3285 return T->getTypeClass() == TemplateTypeParm; 3286 } 3287 static bool classof(const TemplateTypeParmType *T) { return true; } 3288}; 3289 3290/// \brief Represents the result of substituting a type for a template 3291/// type parameter. 3292/// 3293/// Within an instantiated template, all template type parameters have 3294/// been replaced with these. They are used solely to record that a 3295/// type was originally written as a template type parameter; 3296/// therefore they are never canonical. 3297class SubstTemplateTypeParmType : public Type, public llvm::FoldingSetNode { 3298 // The original type parameter. 3299 const TemplateTypeParmType *Replaced; 3300 3301 SubstTemplateTypeParmType(const TemplateTypeParmType *Param, QualType Canon) 3302 : Type(SubstTemplateTypeParm, Canon, Canon->isDependentType(), 3303 Canon->isInstantiationDependentType(), 3304 Canon->isVariablyModifiedType(), 3305 Canon->containsUnexpandedParameterPack()), 3306 Replaced(Param) { } 3307 3308 friend class ASTContext; 3309 3310public: 3311 /// Gets the template parameter that was substituted for. 3312 const TemplateTypeParmType *getReplacedParameter() const { 3313 return Replaced; 3314 } 3315 3316 /// Gets the type that was substituted for the template 3317 /// parameter. 3318 QualType getReplacementType() const { 3319 return getCanonicalTypeInternal(); 3320 } 3321 3322 bool isSugared() const { return true; } 3323 QualType desugar() const { return getReplacementType(); } 3324 3325 void Profile(llvm::FoldingSetNodeID &ID) { 3326 Profile(ID, getReplacedParameter(), getReplacementType()); 3327 } 3328 static void Profile(llvm::FoldingSetNodeID &ID, 3329 const TemplateTypeParmType *Replaced, 3330 QualType Replacement) { 3331 ID.AddPointer(Replaced); 3332 ID.AddPointer(Replacement.getAsOpaquePtr()); 3333 } 3334 3335 static bool classof(const Type *T) { 3336 return T->getTypeClass() == SubstTemplateTypeParm; 3337 } 3338 static bool classof(const SubstTemplateTypeParmType *T) { return true; } 3339}; 3340 3341/// \brief Represents the result of substituting a set of types for a template 3342/// type parameter pack. 3343/// 3344/// When a pack expansion in the source code contains multiple parameter packs 3345/// and those parameter packs correspond to different levels of template 3346/// parameter lists, this type node is used to represent a template type 3347/// parameter pack from an outer level, which has already had its argument pack 3348/// substituted but that still lives within a pack expansion that itself 3349/// could not be instantiated. When actually performing a substitution into 3350/// that pack expansion (e.g., when all template parameters have corresponding 3351/// arguments), this type will be replaced with the \c SubstTemplateTypeParmType 3352/// at the current pack substitution index. 3353class SubstTemplateTypeParmPackType : public Type, public llvm::FoldingSetNode { 3354 /// \brief The original type parameter. 3355 const TemplateTypeParmType *Replaced; 3356 3357 /// \brief A pointer to the set of template arguments that this 3358 /// parameter pack is instantiated with. 3359 const TemplateArgument *Arguments; 3360 3361 /// \brief The number of template arguments in \c Arguments. 3362 unsigned NumArguments; 3363 3364 SubstTemplateTypeParmPackType(const TemplateTypeParmType *Param, 3365 QualType Canon, 3366 const TemplateArgument &ArgPack); 3367 3368 friend class ASTContext; 3369 3370public: 3371 IdentifierInfo *getIdentifier() const { return Replaced->getIdentifier(); } 3372 3373 /// Gets the template parameter that was substituted for. 3374 const TemplateTypeParmType *getReplacedParameter() const { 3375 return Replaced; 3376 } 3377 3378 bool isSugared() const { return false; } 3379 QualType desugar() const { return QualType(this, 0); } 3380 3381 TemplateArgument getArgumentPack() const; 3382 3383 void Profile(llvm::FoldingSetNodeID &ID); 3384 static void Profile(llvm::FoldingSetNodeID &ID, 3385 const TemplateTypeParmType *Replaced, 3386 const TemplateArgument &ArgPack); 3387 3388 static bool classof(const Type *T) { 3389 return T->getTypeClass() == SubstTemplateTypeParmPack; 3390 } 3391 static bool classof(const SubstTemplateTypeParmPackType *T) { return true; } 3392}; 3393 3394/// \brief Represents a C++0x auto type. 3395/// 3396/// These types are usually a placeholder for a deduced type. However, within 3397/// templates and before the initializer is attached, there is no deduced type 3398/// and an auto type is type-dependent and canonical. 3399class AutoType : public Type, public llvm::FoldingSetNode { 3400 AutoType(QualType DeducedType) 3401 : Type(Auto, DeducedType.isNull() ? QualType(this, 0) : DeducedType, 3402 /*Dependent=*/DeducedType.isNull(), 3403 /*InstantiationDependent=*/DeducedType.isNull(), 3404 /*VariablyModified=*/false, /*ContainsParameterPack=*/false) { 3405 assert((DeducedType.isNull() || !DeducedType->isDependentType()) && 3406 "deduced a dependent type for auto"); 3407 } 3408 3409 friend class ASTContext; // ASTContext creates these 3410 3411public: 3412 bool isSugared() const { return isDeduced(); } 3413 QualType desugar() const { return getCanonicalTypeInternal(); } 3414 3415 QualType getDeducedType() const { 3416 return isDeduced() ? getCanonicalTypeInternal() : QualType(); 3417 } 3418 bool isDeduced() const { 3419 return !isDependentType(); 3420 } 3421 3422 void Profile(llvm::FoldingSetNodeID &ID) { 3423 Profile(ID, getDeducedType()); 3424 } 3425 3426 static void Profile(llvm::FoldingSetNodeID &ID, 3427 QualType Deduced) { 3428 ID.AddPointer(Deduced.getAsOpaquePtr()); 3429 } 3430 3431 static bool classof(const Type *T) { 3432 return T->getTypeClass() == Auto; 3433 } 3434 static bool classof(const AutoType *T) { return true; } 3435}; 3436 3437/// \brief Represents a type template specialization; the template 3438/// must be a class template, a type alias template, or a template 3439/// template parameter. A template which cannot be resolved to one of 3440/// these, e.g. because it is written with a dependent scope 3441/// specifier, is instead represented as a 3442/// @c DependentTemplateSpecializationType. 3443/// 3444/// A non-dependent template specialization type is always "sugar", 3445/// typically for a @c RecordType. For example, a class template 3446/// specialization type of @c vector<int> will refer to a tag type for 3447/// the instantiation @c std::vector<int, std::allocator<int>> 3448/// 3449/// Template specializations are dependent if either the template or 3450/// any of the template arguments are dependent, in which case the 3451/// type may also be canonical. 3452/// 3453/// Instances of this type are allocated with a trailing array of 3454/// TemplateArguments, followed by a QualType representing the 3455/// non-canonical aliased type when the template is a type alias 3456/// template. 3457class TemplateSpecializationType 3458 : public Type, public llvm::FoldingSetNode { 3459 /// \brief The name of the template being specialized. This is 3460 /// either a TemplateName::Template (in which case it is a 3461 /// ClassTemplateDecl*, a TemplateTemplateParmDecl*, or a 3462 /// TypeAliasTemplateDecl*), a 3463 /// TemplateName::SubstTemplateTemplateParmPack, or a 3464 /// TemplateName::SubstTemplateTemplateParm (in which case the 3465 /// replacement must, recursively, be one of these). 3466 TemplateName Template; 3467 3468 /// \brief - The number of template arguments named in this class 3469 /// template specialization. 3470 unsigned NumArgs; 3471 3472 TemplateSpecializationType(TemplateName T, 3473 const TemplateArgument *Args, 3474 unsigned NumArgs, QualType Canon, 3475 QualType Aliased); 3476 3477 friend class ASTContext; // ASTContext creates these 3478 3479public: 3480 /// \brief Determine whether any of the given template arguments are 3481 /// dependent. 3482 static bool anyDependentTemplateArguments(const TemplateArgument *Args, 3483 unsigned NumArgs, 3484 bool &InstantiationDependent); 3485 3486 static bool anyDependentTemplateArguments(const TemplateArgumentLoc *Args, 3487 unsigned NumArgs, 3488 bool &InstantiationDependent); 3489 3490 static bool anyDependentTemplateArguments(const TemplateArgumentListInfo &, 3491 bool &InstantiationDependent); 3492 3493 /// \brief Print a template argument list, including the '<' and '>' 3494 /// enclosing the template arguments. 3495 static std::string PrintTemplateArgumentList(const TemplateArgument *Args, 3496 unsigned NumArgs, 3497 const PrintingPolicy &Policy, 3498 bool SkipBrackets = false); 3499 3500 static std::string PrintTemplateArgumentList(const TemplateArgumentLoc *Args, 3501 unsigned NumArgs, 3502 const PrintingPolicy &Policy); 3503 3504 static std::string PrintTemplateArgumentList(const TemplateArgumentListInfo &, 3505 const PrintingPolicy &Policy); 3506 3507 /// True if this template specialization type matches a current 3508 /// instantiation in the context in which it is found. 3509 bool isCurrentInstantiation() const { 3510 return isa<InjectedClassNameType>(getCanonicalTypeInternal()); 3511 } 3512 3513 /// True if this template specialization type is for a type alias 3514 /// template. 3515 bool isTypeAlias() const; 3516 /// Get the aliased type, if this is a specialization of a type alias 3517 /// template. 3518 QualType getAliasedType() const { 3519 assert(isTypeAlias() && "not a type alias template specialization"); 3520 return *reinterpret_cast<const QualType*>(end()); 3521 } 3522 3523 typedef const TemplateArgument * iterator; 3524 3525 iterator begin() const { return getArgs(); } 3526 iterator end() const; // defined inline in TemplateBase.h 3527 3528 /// \brief Retrieve the name of the template that we are specializing. 3529 TemplateName getTemplateName() const { return Template; } 3530 3531 /// \brief Retrieve the template arguments. 3532 const TemplateArgument *getArgs() const { 3533 return reinterpret_cast<const TemplateArgument *>(this + 1); 3534 } 3535 3536 /// \brief Retrieve the number of template arguments. 3537 unsigned getNumArgs() const { return NumArgs; } 3538 3539 /// \brief Retrieve a specific template argument as a type. 3540 /// \precondition @c isArgType(Arg) 3541 const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h 3542 3543 bool isSugared() const { 3544 return !isDependentType() || isCurrentInstantiation() || isTypeAlias(); 3545 } 3546 QualType desugar() const { return getCanonicalTypeInternal(); } 3547 3548 void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Ctx) { 3549 Profile(ID, Template, getArgs(), NumArgs, Ctx); 3550 if (isTypeAlias()) 3551 getAliasedType().Profile(ID); 3552 } 3553 3554 static void Profile(llvm::FoldingSetNodeID &ID, TemplateName T, 3555 const TemplateArgument *Args, 3556 unsigned NumArgs, 3557 const ASTContext &Context); 3558 3559 static bool classof(const Type *T) { 3560 return T->getTypeClass() == TemplateSpecialization; 3561 } 3562 static bool classof(const TemplateSpecializationType *T) { return true; } 3563}; 3564 3565/// \brief The injected class name of a C++ class template or class 3566/// template partial specialization. Used to record that a type was 3567/// spelled with a bare identifier rather than as a template-id; the 3568/// equivalent for non-templated classes is just RecordType. 3569/// 3570/// Injected class name types are always dependent. Template 3571/// instantiation turns these into RecordTypes. 3572/// 3573/// Injected class name types are always canonical. This works 3574/// because it is impossible to compare an injected class name type 3575/// with the corresponding non-injected template type, for the same 3576/// reason that it is impossible to directly compare template 3577/// parameters from different dependent contexts: injected class name 3578/// types can only occur within the scope of a particular templated 3579/// declaration, and within that scope every template specialization 3580/// will canonicalize to the injected class name (when appropriate 3581/// according to the rules of the language). 3582class InjectedClassNameType : public Type { 3583 CXXRecordDecl *Decl; 3584 3585 /// The template specialization which this type represents. 3586 /// For example, in 3587 /// template <class T> class A { ... }; 3588 /// this is A<T>, whereas in 3589 /// template <class X, class Y> class A<B<X,Y> > { ... }; 3590 /// this is A<B<X,Y> >. 3591 /// 3592 /// It is always unqualified, always a template specialization type, 3593 /// and always dependent. 3594 QualType InjectedType; 3595 3596 friend class ASTContext; // ASTContext creates these. 3597 friend class ASTReader; // FIXME: ASTContext::getInjectedClassNameType is not 3598 // currently suitable for AST reading, too much 3599 // interdependencies. 3600 InjectedClassNameType(CXXRecordDecl *D, QualType TST) 3601 : Type(InjectedClassName, QualType(), /*Dependent=*/true, 3602 /*InstantiationDependent=*/true, 3603 /*VariablyModified=*/false, 3604 /*ContainsUnexpandedParameterPack=*/false), 3605 Decl(D), InjectedType(TST) { 3606 assert(isa<TemplateSpecializationType>(TST)); 3607 assert(!TST.hasQualifiers()); 3608 assert(TST->isDependentType()); 3609 } 3610 3611public: 3612 QualType getInjectedSpecializationType() const { return InjectedType; } 3613 const TemplateSpecializationType *getInjectedTST() const { 3614 return cast<TemplateSpecializationType>(InjectedType.getTypePtr()); 3615 } 3616 3617 CXXRecordDecl *getDecl() const; 3618 3619 bool isSugared() const { return false; } 3620 QualType desugar() const { return QualType(this, 0); } 3621 3622 static bool classof(const Type *T) { 3623 return T->getTypeClass() == InjectedClassName; 3624 } 3625 static bool classof(const InjectedClassNameType *T) { return true; } 3626}; 3627 3628/// \brief The kind of a tag type. 3629enum TagTypeKind { 3630 /// \brief The "struct" keyword. 3631 TTK_Struct, 3632 /// \brief The "union" keyword. 3633 TTK_Union, 3634 /// \brief The "class" keyword. 3635 TTK_Class, 3636 /// \brief The "enum" keyword. 3637 TTK_Enum 3638}; 3639 3640/// \brief The elaboration keyword that precedes a qualified type name or 3641/// introduces an elaborated-type-specifier. 3642enum ElaboratedTypeKeyword { 3643 /// \brief The "struct" keyword introduces the elaborated-type-specifier. 3644 ETK_Struct, 3645 /// \brief The "union" keyword introduces the elaborated-type-specifier. 3646 ETK_Union, 3647 /// \brief The "class" keyword introduces the elaborated-type-specifier. 3648 ETK_Class, 3649 /// \brief The "enum" keyword introduces the elaborated-type-specifier. 3650 ETK_Enum, 3651 /// \brief The "typename" keyword precedes the qualified type name, e.g., 3652 /// \c typename T::type. 3653 ETK_Typename, 3654 /// \brief No keyword precedes the qualified type name. 3655 ETK_None 3656}; 3657 3658/// A helper class for Type nodes having an ElaboratedTypeKeyword. 3659/// The keyword in stored in the free bits of the base class. 3660/// Also provides a few static helpers for converting and printing 3661/// elaborated type keyword and tag type kind enumerations. 3662class TypeWithKeyword : public Type { 3663protected: 3664 TypeWithKeyword(ElaboratedTypeKeyword Keyword, TypeClass tc, 3665 QualType Canonical, bool Dependent, 3666 bool InstantiationDependent, bool VariablyModified, 3667 bool ContainsUnexpandedParameterPack) 3668 : Type(tc, Canonical, Dependent, InstantiationDependent, VariablyModified, 3669 ContainsUnexpandedParameterPack) { 3670 TypeWithKeywordBits.Keyword = Keyword; 3671 } 3672 3673public: 3674 ElaboratedTypeKeyword getKeyword() const { 3675 return static_cast<ElaboratedTypeKeyword>(TypeWithKeywordBits.Keyword); 3676 } 3677 3678 /// getKeywordForTypeSpec - Converts a type specifier (DeclSpec::TST) 3679 /// into an elaborated type keyword. 3680 static ElaboratedTypeKeyword getKeywordForTypeSpec(unsigned TypeSpec); 3681 3682 /// getTagTypeKindForTypeSpec - Converts a type specifier (DeclSpec::TST) 3683 /// into a tag type kind. It is an error to provide a type specifier 3684 /// which *isn't* a tag kind here. 3685 static TagTypeKind getTagTypeKindForTypeSpec(unsigned TypeSpec); 3686 3687 /// getKeywordForTagDeclKind - Converts a TagTypeKind into an 3688 /// elaborated type keyword. 3689 static ElaboratedTypeKeyword getKeywordForTagTypeKind(TagTypeKind Tag); 3690 3691 /// getTagTypeKindForKeyword - Converts an elaborated type keyword into 3692 // a TagTypeKind. It is an error to provide an elaborated type keyword 3693 /// which *isn't* a tag kind here. 3694 static TagTypeKind getTagTypeKindForKeyword(ElaboratedTypeKeyword Keyword); 3695 3696 static bool KeywordIsTagTypeKind(ElaboratedTypeKeyword Keyword); 3697 3698 static const char *getKeywordName(ElaboratedTypeKeyword Keyword); 3699 3700 static const char *getTagTypeKindName(TagTypeKind Kind) { 3701 return getKeywordName(getKeywordForTagTypeKind(Kind)); 3702 } 3703 3704 class CannotCastToThisType {}; 3705 static CannotCastToThisType classof(const Type *); 3706}; 3707 3708/// \brief Represents a type that was referred to using an elaborated type 3709/// keyword, e.g., struct S, or via a qualified name, e.g., N::M::type, 3710/// or both. 3711/// 3712/// This type is used to keep track of a type name as written in the 3713/// source code, including tag keywords and any nested-name-specifiers. 3714/// The type itself is always "sugar", used to express what was written 3715/// in the source code but containing no additional semantic information. 3716class ElaboratedType : public TypeWithKeyword, public llvm::FoldingSetNode { 3717 3718 /// \brief The nested name specifier containing the qualifier. 3719 NestedNameSpecifier *NNS; 3720 3721 /// \brief The type that this qualified name refers to. 3722 QualType NamedType; 3723 3724 ElaboratedType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS, 3725 QualType NamedType, QualType CanonType) 3726 : TypeWithKeyword(Keyword, Elaborated, CanonType, 3727 NamedType->isDependentType(), 3728 NamedType->isInstantiationDependentType(), 3729 NamedType->isVariablyModifiedType(), 3730 NamedType->containsUnexpandedParameterPack()), 3731 NNS(NNS), NamedType(NamedType) { 3732 assert(!(Keyword == ETK_None && NNS == 0) && 3733 "ElaboratedType cannot have elaborated type keyword " 3734 "and name qualifier both null."); 3735 } 3736 3737 friend class ASTContext; // ASTContext creates these 3738 3739public: 3740 ~ElaboratedType(); 3741 3742 /// \brief Retrieve the qualification on this type. 3743 NestedNameSpecifier *getQualifier() const { return NNS; } 3744 3745 /// \brief Retrieve the type named by the qualified-id. 3746 QualType getNamedType() const { return NamedType; } 3747 3748 /// \brief Remove a single level of sugar. 3749 QualType desugar() const { return getNamedType(); } 3750 3751 /// \brief Returns whether this type directly provides sugar. 3752 bool isSugared() const { return true; } 3753 3754 void Profile(llvm::FoldingSetNodeID &ID) { 3755 Profile(ID, getKeyword(), NNS, NamedType); 3756 } 3757 3758 static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword, 3759 NestedNameSpecifier *NNS, QualType NamedType) { 3760 ID.AddInteger(Keyword); 3761 ID.AddPointer(NNS); 3762 NamedType.Profile(ID); 3763 } 3764 3765 static bool classof(const Type *T) { 3766 return T->getTypeClass() == Elaborated; 3767 } 3768 static bool classof(const ElaboratedType *T) { return true; } 3769}; 3770 3771/// \brief Represents a qualified type name for which the type name is 3772/// dependent. 3773/// 3774/// DependentNameType represents a class of dependent types that involve a 3775/// dependent nested-name-specifier (e.g., "T::") followed by a (dependent) 3776/// name of a type. The DependentNameType may start with a "typename" (for a 3777/// typename-specifier), "class", "struct", "union", or "enum" (for a 3778/// dependent elaborated-type-specifier), or nothing (in contexts where we 3779/// know that we must be referring to a type, e.g., in a base class specifier). 3780class DependentNameType : public TypeWithKeyword, public llvm::FoldingSetNode { 3781 3782 /// \brief The nested name specifier containing the qualifier. 3783 NestedNameSpecifier *NNS; 3784 3785 /// \brief The type that this typename specifier refers to. 3786 const IdentifierInfo *Name; 3787 3788 DependentNameType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS, 3789 const IdentifierInfo *Name, QualType CanonType) 3790 : TypeWithKeyword(Keyword, DependentName, CanonType, /*Dependent=*/true, 3791 /*InstantiationDependent=*/true, 3792 /*VariablyModified=*/false, 3793 NNS->containsUnexpandedParameterPack()), 3794 NNS(NNS), Name(Name) { 3795 assert(NNS->isDependent() && 3796 "DependentNameType requires a dependent nested-name-specifier"); 3797 } 3798 3799 friend class ASTContext; // ASTContext creates these 3800 3801public: 3802 /// \brief Retrieve the qualification on this type. 3803 NestedNameSpecifier *getQualifier() const { return NNS; } 3804 3805 /// \brief Retrieve the type named by the typename specifier as an 3806 /// identifier. 3807 /// 3808 /// This routine will return a non-NULL identifier pointer when the 3809 /// form of the original typename was terminated by an identifier, 3810 /// e.g., "typename T::type". 3811 const IdentifierInfo *getIdentifier() const { 3812 return Name; 3813 } 3814 3815 bool isSugared() const { return false; } 3816 QualType desugar() const { return QualType(this, 0); } 3817 3818 void Profile(llvm::FoldingSetNodeID &ID) { 3819 Profile(ID, getKeyword(), NNS, Name); 3820 } 3821 3822 static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword, 3823 NestedNameSpecifier *NNS, const IdentifierInfo *Name) { 3824 ID.AddInteger(Keyword); 3825 ID.AddPointer(NNS); 3826 ID.AddPointer(Name); 3827 } 3828 3829 static bool classof(const Type *T) { 3830 return T->getTypeClass() == DependentName; 3831 } 3832 static bool classof(const DependentNameType *T) { return true; } 3833}; 3834 3835/// DependentTemplateSpecializationType - Represents a template 3836/// specialization type whose template cannot be resolved, e.g. 3837/// A<T>::template B<T> 3838class DependentTemplateSpecializationType : 3839 public TypeWithKeyword, public llvm::FoldingSetNode { 3840 3841 /// \brief The nested name specifier containing the qualifier. 3842 NestedNameSpecifier *NNS; 3843 3844 /// \brief The identifier of the template. 3845 const IdentifierInfo *Name; 3846 3847 /// \brief - The number of template arguments named in this class 3848 /// template specialization. 3849 unsigned NumArgs; 3850 3851 const TemplateArgument *getArgBuffer() const { 3852 return reinterpret_cast<const TemplateArgument*>(this+1); 3853 } 3854 TemplateArgument *getArgBuffer() { 3855 return reinterpret_cast<TemplateArgument*>(this+1); 3856 } 3857 3858 DependentTemplateSpecializationType(ElaboratedTypeKeyword Keyword, 3859 NestedNameSpecifier *NNS, 3860 const IdentifierInfo *Name, 3861 unsigned NumArgs, 3862 const TemplateArgument *Args, 3863 QualType Canon); 3864 3865 friend class ASTContext; // ASTContext creates these 3866 3867public: 3868 NestedNameSpecifier *getQualifier() const { return NNS; } 3869 const IdentifierInfo *getIdentifier() const { return Name; } 3870 3871 /// \brief Retrieve the template arguments. 3872 const TemplateArgument *getArgs() const { 3873 return getArgBuffer(); 3874 } 3875 3876 /// \brief Retrieve the number of template arguments. 3877 unsigned getNumArgs() const { return NumArgs; } 3878 3879 const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h 3880 3881 typedef const TemplateArgument * iterator; 3882 iterator begin() const { return getArgs(); } 3883 iterator end() const; // inline in TemplateBase.h 3884 3885 bool isSugared() const { return false; } 3886 QualType desugar() const { return QualType(this, 0); } 3887 3888 void Profile(llvm::FoldingSetNodeID &ID, const ASTContext &Context) { 3889 Profile(ID, Context, getKeyword(), NNS, Name, NumArgs, getArgs()); 3890 } 3891 3892 static void Profile(llvm::FoldingSetNodeID &ID, 3893 const ASTContext &Context, 3894 ElaboratedTypeKeyword Keyword, 3895 NestedNameSpecifier *Qualifier, 3896 const IdentifierInfo *Name, 3897 unsigned NumArgs, 3898 const TemplateArgument *Args); 3899 3900 static bool classof(const Type *T) { 3901 return T->getTypeClass() == DependentTemplateSpecialization; 3902 } 3903 static bool classof(const DependentTemplateSpecializationType *T) { 3904 return true; 3905 } 3906}; 3907 3908/// \brief Represents a pack expansion of types. 3909/// 3910/// Pack expansions are part of C++0x variadic templates. A pack 3911/// expansion contains a pattern, which itself contains one or more 3912/// "unexpanded" parameter packs. When instantiated, a pack expansion 3913/// produces a series of types, each instantiated from the pattern of 3914/// the expansion, where the Ith instantiation of the pattern uses the 3915/// Ith arguments bound to each of the unexpanded parameter packs. The 3916/// pack expansion is considered to "expand" these unexpanded 3917/// parameter packs. 3918/// 3919/// \code 3920/// template<typename ...Types> struct tuple; 3921/// 3922/// template<typename ...Types> 3923/// struct tuple_of_references { 3924/// typedef tuple<Types&...> type; 3925/// }; 3926/// \endcode 3927/// 3928/// Here, the pack expansion \c Types&... is represented via a 3929/// PackExpansionType whose pattern is Types&. 3930class PackExpansionType : public Type, public llvm::FoldingSetNode { 3931 /// \brief The pattern of the pack expansion. 3932 QualType Pattern; 3933 3934 /// \brief The number of expansions that this pack expansion will 3935 /// generate when substituted (+1), or indicates that 3936 /// 3937 /// This field will only have a non-zero value when some of the parameter 3938 /// packs that occur within the pattern have been substituted but others have 3939 /// not. 3940 unsigned NumExpansions; 3941 3942 PackExpansionType(QualType Pattern, QualType Canon, 3943 llvm::Optional<unsigned> NumExpansions) 3944 : Type(PackExpansion, Canon, /*Dependent=*/true, 3945 /*InstantiationDependent=*/true, 3946 /*VariableModified=*/Pattern->isVariablyModifiedType(), 3947 /*ContainsUnexpandedParameterPack=*/false), 3948 Pattern(Pattern), 3949 NumExpansions(NumExpansions? *NumExpansions + 1: 0) { } 3950 3951 friend class ASTContext; // ASTContext creates these 3952 3953public: 3954 /// \brief Retrieve the pattern of this pack expansion, which is the 3955 /// type that will be repeatedly instantiated when instantiating the 3956 /// pack expansion itself. 3957 QualType getPattern() const { return Pattern; } 3958 3959 /// \brief Retrieve the number of expansions that this pack expansion will 3960 /// generate, if known. 3961 llvm::Optional<unsigned> getNumExpansions() const { 3962 if (NumExpansions) 3963 return NumExpansions - 1; 3964 3965 return llvm::Optional<unsigned>(); 3966 } 3967 3968 bool isSugared() const { return false; } 3969 QualType desugar() const { return QualType(this, 0); } 3970 3971 void Profile(llvm::FoldingSetNodeID &ID) { 3972 Profile(ID, getPattern(), getNumExpansions()); 3973 } 3974 3975 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pattern, 3976 llvm::Optional<unsigned> NumExpansions) { 3977 ID.AddPointer(Pattern.getAsOpaquePtr()); 3978 ID.AddBoolean(NumExpansions); 3979 if (NumExpansions) 3980 ID.AddInteger(*NumExpansions); 3981 } 3982 3983 static bool classof(const Type *T) { 3984 return T->getTypeClass() == PackExpansion; 3985 } 3986 static bool classof(const PackExpansionType *T) { 3987 return true; 3988 } 3989}; 3990 3991/// ObjCObjectType - Represents a class type in Objective C. 3992/// Every Objective C type is a combination of a base type and a 3993/// list of protocols. 3994/// 3995/// Given the following declarations: 3996/// @class C; 3997/// @protocol P; 3998/// 3999/// 'C' is an ObjCInterfaceType C. It is sugar for an ObjCObjectType 4000/// with base C and no protocols. 4001/// 4002/// 'C<P>' is an ObjCObjectType with base C and protocol list [P]. 4003/// 4004/// 'id' is a TypedefType which is sugar for an ObjCPointerType whose 4005/// pointee is an ObjCObjectType with base BuiltinType::ObjCIdType 4006/// and no protocols. 4007/// 4008/// 'id<P>' is an ObjCPointerType whose pointee is an ObjCObjecType 4009/// with base BuiltinType::ObjCIdType and protocol list [P]. Eventually 4010/// this should get its own sugar class to better represent the source. 4011class ObjCObjectType : public Type { 4012 // ObjCObjectType.NumProtocols - the number of protocols stored 4013 // after the ObjCObjectPointerType node. 4014 // 4015 // These protocols are those written directly on the type. If 4016 // protocol qualifiers ever become additive, the iterators will need 4017 // to get kindof complicated. 4018 // 4019 // In the canonical object type, these are sorted alphabetically 4020 // and uniqued. 4021 4022 /// Either a BuiltinType or an InterfaceType or sugar for either. 4023 QualType BaseType; 4024 4025 ObjCProtocolDecl * const *getProtocolStorage() const { 4026 return const_cast<ObjCObjectType*>(this)->getProtocolStorage(); 4027 } 4028 4029 ObjCProtocolDecl **getProtocolStorage(); 4030 4031protected: 4032 ObjCObjectType(QualType Canonical, QualType Base, 4033 ObjCProtocolDecl * const *Protocols, unsigned NumProtocols); 4034 4035 enum Nonce_ObjCInterface { Nonce_ObjCInterface }; 4036 ObjCObjectType(enum Nonce_ObjCInterface) 4037 : Type(ObjCInterface, QualType(), false, false, false, false), 4038 BaseType(QualType(this_(), 0)) { 4039 ObjCObjectTypeBits.NumProtocols = 0; 4040 } 4041 4042public: 4043 /// getBaseType - Gets the base type of this object type. This is 4044 /// always (possibly sugar for) one of: 4045 /// - the 'id' builtin type (as opposed to the 'id' type visible to the 4046 /// user, which is a typedef for an ObjCPointerType) 4047 /// - the 'Class' builtin type (same caveat) 4048 /// - an ObjCObjectType (currently always an ObjCInterfaceType) 4049 QualType getBaseType() const { return BaseType; } 4050 4051 bool isObjCId() const { 4052 return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCId); 4053 } 4054 bool isObjCClass() const { 4055 return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCClass); 4056 } 4057 bool isObjCUnqualifiedId() const { return qual_empty() && isObjCId(); } 4058 bool isObjCUnqualifiedClass() const { return qual_empty() && isObjCClass(); } 4059 bool isObjCUnqualifiedIdOrClass() const { 4060 if (!qual_empty()) return false; 4061 if (const BuiltinType *T = getBaseType()->getAs<BuiltinType>()) 4062 return T->getKind() == BuiltinType::ObjCId || 4063 T->getKind() == BuiltinType::ObjCClass; 4064 return false; 4065 } 4066 bool isObjCQualifiedId() const { return !qual_empty() && isObjCId(); } 4067 bool isObjCQualifiedClass() const { return !qual_empty() && isObjCClass(); } 4068 4069 /// Gets the interface declaration for this object type, if the base type 4070 /// really is an interface. 4071 ObjCInterfaceDecl *getInterface() const; 4072 4073 typedef ObjCProtocolDecl * const *qual_iterator; 4074 4075 qual_iterator qual_begin() const { return getProtocolStorage(); } 4076 qual_iterator qual_end() const { return qual_begin() + getNumProtocols(); } 4077 4078 bool qual_empty() const { return getNumProtocols() == 0; } 4079 4080 /// getNumProtocols - Return the number of qualifying protocols in this 4081 /// interface type, or 0 if there are none. 4082 unsigned getNumProtocols() const { return ObjCObjectTypeBits.NumProtocols; } 4083 4084 /// \brief Fetch a protocol by index. 4085 ObjCProtocolDecl *getProtocol(unsigned I) const { 4086 assert(I < getNumProtocols() && "Out-of-range protocol access"); 4087 return qual_begin()[I]; 4088 } 4089 4090 bool isSugared() const { return false; } 4091 QualType desugar() const { return QualType(this, 0); } 4092 4093 static bool classof(const Type *T) { 4094 return T->getTypeClass() == ObjCObject || 4095 T->getTypeClass() == ObjCInterface; 4096 } 4097 static bool classof(const ObjCObjectType *) { return true; } 4098}; 4099 4100/// ObjCObjectTypeImpl - A class providing a concrete implementation 4101/// of ObjCObjectType, so as to not increase the footprint of 4102/// ObjCInterfaceType. Code outside of ASTContext and the core type 4103/// system should not reference this type. 4104class ObjCObjectTypeImpl : public ObjCObjectType, public llvm::FoldingSetNode { 4105 friend class ASTContext; 4106 4107 // If anyone adds fields here, ObjCObjectType::getProtocolStorage() 4108 // will need to be modified. 4109 4110 ObjCObjectTypeImpl(QualType Canonical, QualType Base, 4111 ObjCProtocolDecl * const *Protocols, 4112 unsigned NumProtocols) 4113 : ObjCObjectType(Canonical, Base, Protocols, NumProtocols) {} 4114 4115public: 4116 void Profile(llvm::FoldingSetNodeID &ID); 4117 static void Profile(llvm::FoldingSetNodeID &ID, 4118 QualType Base, 4119 ObjCProtocolDecl *const *protocols, 4120 unsigned NumProtocols); 4121}; 4122 4123inline ObjCProtocolDecl **ObjCObjectType::getProtocolStorage() { 4124 return reinterpret_cast<ObjCProtocolDecl**>( 4125 static_cast<ObjCObjectTypeImpl*>(this) + 1); 4126} 4127 4128/// ObjCInterfaceType - Interfaces are the core concept in Objective-C for 4129/// object oriented design. They basically correspond to C++ classes. There 4130/// are two kinds of interface types, normal interfaces like "NSString" and 4131/// qualified interfaces, which are qualified with a protocol list like 4132/// "NSString<NSCopyable, NSAmazing>". 4133/// 4134/// ObjCInterfaceType guarantees the following properties when considered 4135/// as a subtype of its superclass, ObjCObjectType: 4136/// - There are no protocol qualifiers. To reinforce this, code which 4137/// tries to invoke the protocol methods via an ObjCInterfaceType will 4138/// fail to compile. 4139/// - It is its own base type. That is, if T is an ObjCInterfaceType*, 4140/// T->getBaseType() == QualType(T, 0). 4141class ObjCInterfaceType : public ObjCObjectType { 4142 ObjCInterfaceDecl *Decl; 4143 4144 ObjCInterfaceType(const ObjCInterfaceDecl *D) 4145 : ObjCObjectType(Nonce_ObjCInterface), 4146 Decl(const_cast<ObjCInterfaceDecl*>(D)) {} 4147 friend class ASTContext; // ASTContext creates these. 4148 4149public: 4150 /// getDecl - Get the declaration of this interface. 4151 ObjCInterfaceDecl *getDecl() const { return Decl; } 4152 4153 bool isSugared() const { return false; } 4154 QualType desugar() const { return QualType(this, 0); } 4155 4156 static bool classof(const Type *T) { 4157 return T->getTypeClass() == ObjCInterface; 4158 } 4159 static bool classof(const ObjCInterfaceType *) { return true; } 4160 4161 // Nonsense to "hide" certain members of ObjCObjectType within this 4162 // class. People asking for protocols on an ObjCInterfaceType are 4163 // not going to get what they want: ObjCInterfaceTypes are 4164 // guaranteed to have no protocols. 4165 enum { 4166 qual_iterator, 4167 qual_begin, 4168 qual_end, 4169 getNumProtocols, 4170 getProtocol 4171 }; 4172}; 4173 4174inline ObjCInterfaceDecl *ObjCObjectType::getInterface() const { 4175 if (const ObjCInterfaceType *T = 4176 getBaseType()->getAs<ObjCInterfaceType>()) 4177 return T->getDecl(); 4178 return 0; 4179} 4180 4181/// ObjCObjectPointerType - Used to represent a pointer to an 4182/// Objective C object. These are constructed from pointer 4183/// declarators when the pointee type is an ObjCObjectType (or sugar 4184/// for one). In addition, the 'id' and 'Class' types are typedefs 4185/// for these, and the protocol-qualified types 'id<P>' and 'Class<P>' 4186/// are translated into these. 4187/// 4188/// Pointers to pointers to Objective C objects are still PointerTypes; 4189/// only the first level of pointer gets it own type implementation. 4190class ObjCObjectPointerType : public Type, public llvm::FoldingSetNode { 4191 QualType PointeeType; 4192 4193 ObjCObjectPointerType(QualType Canonical, QualType Pointee) 4194 : Type(ObjCObjectPointer, Canonical, false, false, false, false), 4195 PointeeType(Pointee) {} 4196 friend class ASTContext; // ASTContext creates these. 4197 4198public: 4199 /// getPointeeType - Gets the type pointed to by this ObjC pointer. 4200 /// The result will always be an ObjCObjectType or sugar thereof. 4201 QualType getPointeeType() const { return PointeeType; } 4202 4203 /// getObjCObjectType - Gets the type pointed to by this ObjC 4204 /// pointer. This method always returns non-null. 4205 /// 4206 /// This method is equivalent to getPointeeType() except that 4207 /// it discards any typedefs (or other sugar) between this 4208 /// type and the "outermost" object type. So for: 4209 /// @class A; @protocol P; @protocol Q; 4210 /// typedef A<P> AP; 4211 /// typedef A A1; 4212 /// typedef A1<P> A1P; 4213 /// typedef A1P<Q> A1PQ; 4214 /// For 'A*', getObjectType() will return 'A'. 4215 /// For 'A<P>*', getObjectType() will return 'A<P>'. 4216 /// For 'AP*', getObjectType() will return 'A<P>'. 4217 /// For 'A1*', getObjectType() will return 'A'. 4218 /// For 'A1<P>*', getObjectType() will return 'A1<P>'. 4219 /// For 'A1P*', getObjectType() will return 'A1<P>'. 4220 /// For 'A1PQ*', getObjectType() will return 'A1<Q>', because 4221 /// adding protocols to a protocol-qualified base discards the 4222 /// old qualifiers (for now). But if it didn't, getObjectType() 4223 /// would return 'A1P<Q>' (and we'd have to make iterating over 4224 /// qualifiers more complicated). 4225 const ObjCObjectType *getObjectType() const { 4226 return PointeeType->castAs<ObjCObjectType>(); 4227 } 4228 4229 /// getInterfaceType - If this pointer points to an Objective C 4230 /// @interface type, gets the type for that interface. Any protocol 4231 /// qualifiers on the interface are ignored. 4232 /// 4233 /// \return null if the base type for this pointer is 'id' or 'Class' 4234 const ObjCInterfaceType *getInterfaceType() const { 4235 return getObjectType()->getBaseType()->getAs<ObjCInterfaceType>(); 4236 } 4237 4238 /// getInterfaceDecl - If this pointer points to an Objective @interface 4239 /// type, gets the declaration for that interface. 4240 /// 4241 /// \return null if the base type for this pointer is 'id' or 'Class' 4242 ObjCInterfaceDecl *getInterfaceDecl() const { 4243 return getObjectType()->getInterface(); 4244 } 4245 4246 /// isObjCIdType - True if this is equivalent to the 'id' type, i.e. if 4247 /// its object type is the primitive 'id' type with no protocols. 4248 bool isObjCIdType() const { 4249 return getObjectType()->isObjCUnqualifiedId(); 4250 } 4251 4252 /// isObjCClassType - True if this is equivalent to the 'Class' type, 4253 /// i.e. if its object tive is the primitive 'Class' type with no protocols. 4254 bool isObjCClassType() const { 4255 return getObjectType()->isObjCUnqualifiedClass(); 4256 } 4257 4258 /// isObjCQualifiedIdType - True if this is equivalent to 'id<P>' for some 4259 /// non-empty set of protocols. 4260 bool isObjCQualifiedIdType() const { 4261 return getObjectType()->isObjCQualifiedId(); 4262 } 4263 4264 /// isObjCQualifiedClassType - True if this is equivalent to 'Class<P>' for 4265 /// some non-empty set of protocols. 4266 bool isObjCQualifiedClassType() const { 4267 return getObjectType()->isObjCQualifiedClass(); 4268 } 4269 4270 /// An iterator over the qualifiers on the object type. Provided 4271 /// for convenience. This will always iterate over the full set of 4272 /// protocols on a type, not just those provided directly. 4273 typedef ObjCObjectType::qual_iterator qual_iterator; 4274 4275 qual_iterator qual_begin() const { 4276 return getObjectType()->qual_begin(); 4277 } 4278 qual_iterator qual_end() const { 4279 return getObjectType()->qual_end(); 4280 } 4281 bool qual_empty() const { return getObjectType()->qual_empty(); } 4282 4283 /// getNumProtocols - Return the number of qualifying protocols on 4284 /// the object type. 4285 unsigned getNumProtocols() const { 4286 return getObjectType()->getNumProtocols(); 4287 } 4288 4289 /// \brief Retrieve a qualifying protocol by index on the object 4290 /// type. 4291 ObjCProtocolDecl *getProtocol(unsigned I) const { 4292 return getObjectType()->getProtocol(I); 4293 } 4294 4295 bool isSugared() const { return false; } 4296 QualType desugar() const { return QualType(this, 0); } 4297 4298 void Profile(llvm::FoldingSetNodeID &ID) { 4299 Profile(ID, getPointeeType()); 4300 } 4301 static void Profile(llvm::FoldingSetNodeID &ID, QualType T) { 4302 ID.AddPointer(T.getAsOpaquePtr()); 4303 } 4304 static bool classof(const Type *T) { 4305 return T->getTypeClass() == ObjCObjectPointer; 4306 } 4307 static bool classof(const ObjCObjectPointerType *) { return true; } 4308}; 4309 4310class AtomicType : public Type, public llvm::FoldingSetNode { 4311 QualType ValueType; 4312 4313 AtomicType(QualType ValTy, QualType Canonical) 4314 : Type(Atomic, Canonical, ValTy->isDependentType(), 4315 ValTy->isInstantiationDependentType(), 4316 ValTy->isVariablyModifiedType(), 4317 ValTy->containsUnexpandedParameterPack()), 4318 ValueType(ValTy) {} 4319 friend class ASTContext; // ASTContext creates these. 4320 4321 public: 4322 /// getValueType - Gets the type contained by this atomic type, i.e. 4323 /// the type returned by performing an atomic load of this atomic type. 4324 QualType getValueType() const { return ValueType; } 4325 4326 bool isSugared() const { return false; } 4327 QualType desugar() const { return QualType(this, 0); } 4328 4329 void Profile(llvm::FoldingSetNodeID &ID) { 4330 Profile(ID, getValueType()); 4331 } 4332 static void Profile(llvm::FoldingSetNodeID &ID, QualType T) { 4333 ID.AddPointer(T.getAsOpaquePtr()); 4334 } 4335 static bool classof(const Type *T) { 4336 return T->getTypeClass() == Atomic; 4337 } 4338 static bool classof(const AtomicType *) { return true; } 4339}; 4340 4341/// A qualifier set is used to build a set of qualifiers. 4342class QualifierCollector : public Qualifiers { 4343public: 4344 QualifierCollector(Qualifiers Qs = Qualifiers()) : Qualifiers(Qs) {} 4345 4346 /// Collect any qualifiers on the given type and return an 4347 /// unqualified type. The qualifiers are assumed to be consistent 4348 /// with those already in the type. 4349 const Type *strip(QualType type) { 4350 addFastQualifiers(type.getLocalFastQualifiers()); 4351 if (!type.hasLocalNonFastQualifiers()) 4352 return type.getTypePtrUnsafe(); 4353 4354 const ExtQuals *extQuals = type.getExtQualsUnsafe(); 4355 addConsistentQualifiers(extQuals->getQualifiers()); 4356 return extQuals->getBaseType(); 4357 } 4358 4359 /// Apply the collected qualifiers to the given type. 4360 QualType apply(const ASTContext &Context, QualType QT) const; 4361 4362 /// Apply the collected qualifiers to the given type. 4363 QualType apply(const ASTContext &Context, const Type* T) const; 4364}; 4365 4366 4367// Inline function definitions. 4368 4369inline const Type *QualType::getTypePtr() const { 4370 return getCommonPtr()->BaseType; 4371} 4372 4373inline const Type *QualType::getTypePtrOrNull() const { 4374 return (isNull() ? 0 : getCommonPtr()->BaseType); 4375} 4376 4377inline SplitQualType QualType::split() const { 4378 if (!hasLocalNonFastQualifiers()) 4379 return SplitQualType(getTypePtrUnsafe(), 4380 Qualifiers::fromFastMask(getLocalFastQualifiers())); 4381 4382 const ExtQuals *eq = getExtQualsUnsafe(); 4383 Qualifiers qs = eq->getQualifiers(); 4384 qs.addFastQualifiers(getLocalFastQualifiers()); 4385 return SplitQualType(eq->getBaseType(), qs); 4386} 4387 4388inline Qualifiers QualType::getLocalQualifiers() const { 4389 Qualifiers Quals; 4390 if (hasLocalNonFastQualifiers()) 4391 Quals = getExtQualsUnsafe()->getQualifiers(); 4392 Quals.addFastQualifiers(getLocalFastQualifiers()); 4393 return Quals; 4394} 4395 4396inline Qualifiers QualType::getQualifiers() const { 4397 Qualifiers quals = getCommonPtr()->CanonicalType.getLocalQualifiers(); 4398 quals.addFastQualifiers(getLocalFastQualifiers()); 4399 return quals; 4400} 4401 4402inline unsigned QualType::getCVRQualifiers() const { 4403 unsigned cvr = getCommonPtr()->CanonicalType.getLocalCVRQualifiers(); 4404 cvr |= getLocalCVRQualifiers(); 4405 return cvr; 4406} 4407 4408inline QualType QualType::getCanonicalType() const { 4409 QualType canon = getCommonPtr()->CanonicalType; 4410 return canon.withFastQualifiers(getLocalFastQualifiers()); 4411} 4412 4413inline bool QualType::isCanonical() const { 4414 return getTypePtr()->isCanonicalUnqualified(); 4415} 4416 4417inline bool QualType::isCanonicalAsParam() const { 4418 if (!isCanonical()) return false; 4419 if (hasLocalQualifiers()) return false; 4420 4421 const Type *T = getTypePtr(); 4422 if (T->isVariablyModifiedType() && T->hasSizedVLAType()) 4423 return false; 4424 4425 return !isa<FunctionType>(T) && !isa<ArrayType>(T); 4426} 4427 4428inline bool QualType::isConstQualified() const { 4429 return isLocalConstQualified() || 4430 getCommonPtr()->CanonicalType.isLocalConstQualified(); 4431} 4432 4433inline bool QualType::isRestrictQualified() const { 4434 return isLocalRestrictQualified() || 4435 getCommonPtr()->CanonicalType.isLocalRestrictQualified(); 4436} 4437 4438 4439inline bool QualType::isVolatileQualified() const { 4440 return isLocalVolatileQualified() || 4441 getCommonPtr()->CanonicalType.isLocalVolatileQualified(); 4442} 4443 4444inline bool QualType::hasQualifiers() const { 4445 return hasLocalQualifiers() || 4446 getCommonPtr()->CanonicalType.hasLocalQualifiers(); 4447} 4448 4449inline QualType QualType::getUnqualifiedType() const { 4450 if (!getTypePtr()->getCanonicalTypeInternal().hasLocalQualifiers()) 4451 return QualType(getTypePtr(), 0); 4452 4453 return QualType(getSplitUnqualifiedTypeImpl(*this).first, 0); 4454} 4455 4456inline SplitQualType QualType::getSplitUnqualifiedType() const { 4457 if (!getTypePtr()->getCanonicalTypeInternal().hasLocalQualifiers()) 4458 return split(); 4459 4460 return getSplitUnqualifiedTypeImpl(*this); 4461} 4462 4463inline void QualType::removeLocalConst() { 4464 removeLocalFastQualifiers(Qualifiers::Const); 4465} 4466 4467inline void QualType::removeLocalRestrict() { 4468 removeLocalFastQualifiers(Qualifiers::Restrict); 4469} 4470 4471inline void QualType::removeLocalVolatile() { 4472 removeLocalFastQualifiers(Qualifiers::Volatile); 4473} 4474 4475inline void QualType::removeLocalCVRQualifiers(unsigned Mask) { 4476 assert(!(Mask & ~Qualifiers::CVRMask) && "mask has non-CVR bits"); 4477 assert((int)Qualifiers::CVRMask == (int)Qualifiers::FastMask); 4478 4479 // Fast path: we don't need to touch the slow qualifiers. 4480 removeLocalFastQualifiers(Mask); 4481} 4482 4483/// getAddressSpace - Return the address space of this type. 4484inline unsigned QualType::getAddressSpace() const { 4485 return getQualifiers().getAddressSpace(); 4486} 4487 4488/// getObjCGCAttr - Return the gc attribute of this type. 4489inline Qualifiers::GC QualType::getObjCGCAttr() const { 4490 return getQualifiers().getObjCGCAttr(); 4491} 4492 4493inline FunctionType::ExtInfo getFunctionExtInfo(const Type &t) { 4494 if (const PointerType *PT = t.getAs<PointerType>()) { 4495 if (const FunctionType *FT = PT->getPointeeType()->getAs<FunctionType>()) 4496 return FT->getExtInfo(); 4497 } else if (const FunctionType *FT = t.getAs<FunctionType>()) 4498 return FT->getExtInfo(); 4499 4500 return FunctionType::ExtInfo(); 4501} 4502 4503inline FunctionType::ExtInfo getFunctionExtInfo(QualType t) { 4504 return getFunctionExtInfo(*t); 4505} 4506 4507/// isMoreQualifiedThan - Determine whether this type is more 4508/// qualified than the Other type. For example, "const volatile int" 4509/// is more qualified than "const int", "volatile int", and 4510/// "int". However, it is not more qualified than "const volatile 4511/// int". 4512inline bool QualType::isMoreQualifiedThan(QualType other) const { 4513 Qualifiers myQuals = getQualifiers(); 4514 Qualifiers otherQuals = other.getQualifiers(); 4515 return (myQuals != otherQuals && myQuals.compatiblyIncludes(otherQuals)); 4516} 4517 4518/// isAtLeastAsQualifiedAs - Determine whether this type is at last 4519/// as qualified as the Other type. For example, "const volatile 4520/// int" is at least as qualified as "const int", "volatile int", 4521/// "int", and "const volatile int". 4522inline bool QualType::isAtLeastAsQualifiedAs(QualType other) const { 4523 return getQualifiers().compatiblyIncludes(other.getQualifiers()); 4524} 4525 4526/// getNonReferenceType - If Type is a reference type (e.g., const 4527/// int&), returns the type that the reference refers to ("const 4528/// int"). Otherwise, returns the type itself. This routine is used 4529/// throughout Sema to implement C++ 5p6: 4530/// 4531/// If an expression initially has the type "reference to T" (8.3.2, 4532/// 8.5.3), the type is adjusted to "T" prior to any further 4533/// analysis, the expression designates the object or function 4534/// denoted by the reference, and the expression is an lvalue. 4535inline QualType QualType::getNonReferenceType() const { 4536 if (const ReferenceType *RefType = (*this)->getAs<ReferenceType>()) 4537 return RefType->getPointeeType(); 4538 else 4539 return *this; 4540} 4541 4542inline bool QualType::isCForbiddenLValueType() const { 4543 return ((getTypePtr()->isVoidType() && !hasQualifiers()) || 4544 getTypePtr()->isFunctionType()); 4545} 4546 4547/// \brief Tests whether the type is categorized as a fundamental type. 4548/// 4549/// \returns True for types specified in C++0x [basic.fundamental]. 4550inline bool Type::isFundamentalType() const { 4551 return isVoidType() || 4552 // FIXME: It's really annoying that we don't have an 4553 // 'isArithmeticType()' which agrees with the standard definition. 4554 (isArithmeticType() && !isEnumeralType()); 4555} 4556 4557/// \brief Tests whether the type is categorized as a compound type. 4558/// 4559/// \returns True for types specified in C++0x [basic.compound]. 4560inline bool Type::isCompoundType() const { 4561 // C++0x [basic.compound]p1: 4562 // Compound types can be constructed in the following ways: 4563 // -- arrays of objects of a given type [...]; 4564 return isArrayType() || 4565 // -- functions, which have parameters of given types [...]; 4566 isFunctionType() || 4567 // -- pointers to void or objects or functions [...]; 4568 isPointerType() || 4569 // -- references to objects or functions of a given type. [...] 4570 isReferenceType() || 4571 // -- classes containing a sequence of objects of various types, [...]; 4572 isRecordType() || 4573 // -- unions, which are classes capable of containing objects of different 4574 // types at different times; 4575 isUnionType() || 4576 // -- enumerations, which comprise a set of named constant values. [...]; 4577 isEnumeralType() || 4578 // -- pointers to non-static class members, [...]. 4579 isMemberPointerType(); 4580} 4581 4582inline bool Type::isFunctionType() const { 4583 return isa<FunctionType>(CanonicalType); 4584} 4585inline bool Type::isPointerType() const { 4586 return isa<PointerType>(CanonicalType); 4587} 4588inline bool Type::isAnyPointerType() const { 4589 return isPointerType() || isObjCObjectPointerType(); 4590} 4591inline bool Type::isBlockPointerType() const { 4592 return isa<BlockPointerType>(CanonicalType); 4593} 4594inline bool Type::isReferenceType() const { 4595 return isa<ReferenceType>(CanonicalType); 4596} 4597inline bool Type::isLValueReferenceType() const { 4598 return isa<LValueReferenceType>(CanonicalType); 4599} 4600inline bool Type::isRValueReferenceType() const { 4601 return isa<RValueReferenceType>(CanonicalType); 4602} 4603inline bool Type::isFunctionPointerType() const { 4604 if (const PointerType *T = getAs<PointerType>()) 4605 return T->getPointeeType()->isFunctionType(); 4606 else 4607 return false; 4608} 4609inline bool Type::isMemberPointerType() const { 4610 return isa<MemberPointerType>(CanonicalType); 4611} 4612inline bool Type::isMemberFunctionPointerType() const { 4613 if (const MemberPointerType* T = getAs<MemberPointerType>()) 4614 return T->isMemberFunctionPointer(); 4615 else 4616 return false; 4617} 4618inline bool Type::isMemberDataPointerType() const { 4619 if (const MemberPointerType* T = getAs<MemberPointerType>()) 4620 return T->isMemberDataPointer(); 4621 else 4622 return false; 4623} 4624inline bool Type::isArrayType() const { 4625 return isa<ArrayType>(CanonicalType); 4626} 4627inline bool Type::isConstantArrayType() const { 4628 return isa<ConstantArrayType>(CanonicalType); 4629} 4630inline bool Type::isIncompleteArrayType() const { 4631 return isa<IncompleteArrayType>(CanonicalType); 4632} 4633inline bool Type::isVariableArrayType() const { 4634 return isa<VariableArrayType>(CanonicalType); 4635} 4636inline bool Type::isDependentSizedArrayType() const { 4637 return isa<DependentSizedArrayType>(CanonicalType); 4638} 4639inline bool Type::isBuiltinType() const { 4640 return isa<BuiltinType>(CanonicalType); 4641} 4642inline bool Type::isRecordType() const { 4643 return isa<RecordType>(CanonicalType); 4644} 4645inline bool Type::isEnumeralType() const { 4646 return isa<EnumType>(CanonicalType); 4647} 4648inline bool Type::isAnyComplexType() const { 4649 return isa<ComplexType>(CanonicalType); 4650} 4651inline bool Type::isVectorType() const { 4652 return isa<VectorType>(CanonicalType); 4653} 4654inline bool Type::isExtVectorType() const { 4655 return isa<ExtVectorType>(CanonicalType); 4656} 4657inline bool Type::isObjCObjectPointerType() const { 4658 return isa<ObjCObjectPointerType>(CanonicalType); 4659} 4660inline bool Type::isObjCObjectType() const { 4661 return isa<ObjCObjectType>(CanonicalType); 4662} 4663inline bool Type::isObjCObjectOrInterfaceType() const { 4664 return isa<ObjCInterfaceType>(CanonicalType) || 4665 isa<ObjCObjectType>(CanonicalType); 4666} 4667inline bool Type::isAtomicType() const { 4668 return isa<AtomicType>(CanonicalType); 4669} 4670 4671inline bool Type::isObjCQualifiedIdType() const { 4672 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 4673 return OPT->isObjCQualifiedIdType(); 4674 return false; 4675} 4676inline bool Type::isObjCQualifiedClassType() const { 4677 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 4678 return OPT->isObjCQualifiedClassType(); 4679 return false; 4680} 4681inline bool Type::isObjCIdType() const { 4682 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 4683 return OPT->isObjCIdType(); 4684 return false; 4685} 4686inline bool Type::isObjCClassType() const { 4687 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 4688 return OPT->isObjCClassType(); 4689 return false; 4690} 4691inline bool Type::isObjCSelType() const { 4692 if (const PointerType *OPT = getAs<PointerType>()) 4693 return OPT->getPointeeType()->isSpecificBuiltinType(BuiltinType::ObjCSel); 4694 return false; 4695} 4696inline bool Type::isObjCBuiltinType() const { 4697 return isObjCIdType() || isObjCClassType() || isObjCSelType(); 4698} 4699inline bool Type::isTemplateTypeParmType() const { 4700 return isa<TemplateTypeParmType>(CanonicalType); 4701} 4702 4703inline bool Type::isSpecificBuiltinType(unsigned K) const { 4704 if (const BuiltinType *BT = getAs<BuiltinType>()) 4705 if (BT->getKind() == (BuiltinType::Kind) K) 4706 return true; 4707 return false; 4708} 4709 4710inline bool Type::isPlaceholderType() const { 4711 if (const BuiltinType *BT = dyn_cast<BuiltinType>(this)) 4712 return BT->isPlaceholderType(); 4713 return false; 4714} 4715 4716inline const BuiltinType *Type::getAsPlaceholderType() const { 4717 if (const BuiltinType *BT = dyn_cast<BuiltinType>(this)) 4718 if (BT->isPlaceholderType()) 4719 return BT; 4720 return 0; 4721} 4722 4723inline bool Type::isSpecificPlaceholderType(unsigned K) const { 4724 assert(BuiltinType::isPlaceholderTypeKind((BuiltinType::Kind) K)); 4725 if (const BuiltinType *BT = dyn_cast<BuiltinType>(this)) 4726 return (BT->getKind() == (BuiltinType::Kind) K); 4727 return false; 4728} 4729 4730inline bool Type::isNonOverloadPlaceholderType() const { 4731 if (const BuiltinType *BT = dyn_cast<BuiltinType>(this)) 4732 return BT->isNonOverloadPlaceholderType(); 4733 return false; 4734} 4735 4736/// \brief Determines whether this is a type for which one can define 4737/// an overloaded operator. 4738inline bool Type::isOverloadableType() const { 4739 return isDependentType() || isRecordType() || isEnumeralType(); 4740} 4741 4742/// \brief Determines whether this type can decay to a pointer type. 4743inline bool Type::canDecayToPointerType() const { 4744 return isFunctionType() || isArrayType(); 4745} 4746 4747inline bool Type::hasPointerRepresentation() const { 4748 return (isPointerType() || isReferenceType() || isBlockPointerType() || 4749 isObjCObjectPointerType() || isNullPtrType()); 4750} 4751 4752inline bool Type::hasObjCPointerRepresentation() const { 4753 return isObjCObjectPointerType(); 4754} 4755 4756inline const Type *Type::getBaseElementTypeUnsafe() const { 4757 const Type *type = this; 4758 while (const ArrayType *arrayType = type->getAsArrayTypeUnsafe()) 4759 type = arrayType->getElementType().getTypePtr(); 4760 return type; 4761} 4762 4763/// Insertion operator for diagnostics. This allows sending QualType's into a 4764/// diagnostic with <<. 4765inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB, 4766 QualType T) { 4767 DB.AddTaggedVal(reinterpret_cast<intptr_t>(T.getAsOpaquePtr()), 4768 DiagnosticsEngine::ak_qualtype); 4769 return DB; 4770} 4771 4772/// Insertion operator for partial diagnostics. This allows sending QualType's 4773/// into a diagnostic with <<. 4774inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD, 4775 QualType T) { 4776 PD.AddTaggedVal(reinterpret_cast<intptr_t>(T.getAsOpaquePtr()), 4777 DiagnosticsEngine::ak_qualtype); 4778 return PD; 4779} 4780 4781// Helper class template that is used by Type::getAs to ensure that one does 4782// not try to look through a qualified type to get to an array type. 4783template<typename T, 4784 bool isArrayType = (llvm::is_same<T, ArrayType>::value || 4785 llvm::is_base_of<ArrayType, T>::value)> 4786struct ArrayType_cannot_be_used_with_getAs { }; 4787 4788template<typename T> 4789struct ArrayType_cannot_be_used_with_getAs<T, true>; 4790 4791/// Member-template getAs<specific type>'. 4792template <typename T> const T *Type::getAs() const { 4793 ArrayType_cannot_be_used_with_getAs<T> at; 4794 (void)at; 4795 4796 // If this is directly a T type, return it. 4797 if (const T *Ty = dyn_cast<T>(this)) 4798 return Ty; 4799 4800 // If the canonical form of this type isn't the right kind, reject it. 4801 if (!isa<T>(CanonicalType)) 4802 return 0; 4803 4804 // If this is a typedef for the type, strip the typedef off without 4805 // losing all typedef information. 4806 return cast<T>(getUnqualifiedDesugaredType()); 4807} 4808 4809inline const ArrayType *Type::getAsArrayTypeUnsafe() const { 4810 // If this is directly an array type, return it. 4811 if (const ArrayType *arr = dyn_cast<ArrayType>(this)) 4812 return arr; 4813 4814 // If the canonical form of this type isn't the right kind, reject it. 4815 if (!isa<ArrayType>(CanonicalType)) 4816 return 0; 4817 4818 // If this is a typedef for the type, strip the typedef off without 4819 // losing all typedef information. 4820 return cast<ArrayType>(getUnqualifiedDesugaredType()); 4821} 4822 4823template <typename T> const T *Type::castAs() const { 4824 ArrayType_cannot_be_used_with_getAs<T> at; 4825 (void) at; 4826 4827 assert(isa<T>(CanonicalType)); 4828 if (const T *ty = dyn_cast<T>(this)) return ty; 4829 return cast<T>(getUnqualifiedDesugaredType()); 4830} 4831 4832inline const ArrayType *Type::castAsArrayTypeUnsafe() const { 4833 assert(isa<ArrayType>(CanonicalType)); 4834 if (const ArrayType *arr = dyn_cast<ArrayType>(this)) return arr; 4835 return cast<ArrayType>(getUnqualifiedDesugaredType()); 4836} 4837 4838} // end namespace clang 4839 4840#endif 4841