Type.h revision 6fa68948f7d604946617deb5de14ce3d7905b21c
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/IdentifierTable.h" 19#include "clang/Basic/Linkage.h" 20#include "clang/Basic/PartialDiagnostic.h" 21#include "clang/AST/NestedNameSpecifier.h" 22#include "clang/AST/TemplateName.h" 23#include "llvm/Support/Casting.h" 24#include "llvm/Support/type_traits.h" 25#include "llvm/ADT/APSInt.h" 26#include "llvm/ADT/FoldingSet.h" 27#include "llvm/ADT/PointerIntPair.h" 28#include "llvm/ADT/PointerUnion.h" 29 30using llvm::isa; 31using llvm::cast; 32using llvm::cast_or_null; 33using llvm::dyn_cast; 34using llvm::dyn_cast_or_null; 35namespace clang { 36 enum { 37 TypeAlignmentInBits = 3, 38 TypeAlignment = 1 << TypeAlignmentInBits 39 }; 40 class Type; 41 class ExtQuals; 42 class QualType; 43} 44 45namespace llvm { 46 template <typename T> 47 class PointerLikeTypeTraits; 48 template<> 49 class PointerLikeTypeTraits< ::clang::Type*> { 50 public: 51 static inline void *getAsVoidPointer(::clang::Type *P) { return P; } 52 static inline ::clang::Type *getFromVoidPointer(void *P) { 53 return static_cast< ::clang::Type*>(P); 54 } 55 enum { NumLowBitsAvailable = clang::TypeAlignmentInBits }; 56 }; 57 template<> 58 class PointerLikeTypeTraits< ::clang::ExtQuals*> { 59 public: 60 static inline void *getAsVoidPointer(::clang::ExtQuals *P) { return P; } 61 static inline ::clang::ExtQuals *getFromVoidPointer(void *P) { 62 return static_cast< ::clang::ExtQuals*>(P); 63 } 64 enum { NumLowBitsAvailable = clang::TypeAlignmentInBits }; 65 }; 66 67 template <> 68 struct isPodLike<clang::QualType> { static const bool value = true; }; 69} 70 71namespace clang { 72 class ASTContext; 73 class TypedefDecl; 74 class TemplateDecl; 75 class TemplateTypeParmDecl; 76 class NonTypeTemplateParmDecl; 77 class TemplateTemplateParmDecl; 78 class TagDecl; 79 class RecordDecl; 80 class CXXRecordDecl; 81 class EnumDecl; 82 class FieldDecl; 83 class ObjCInterfaceDecl; 84 class ObjCProtocolDecl; 85 class ObjCMethodDecl; 86 class UnresolvedUsingTypenameDecl; 87 class Expr; 88 class Stmt; 89 class SourceLocation; 90 class StmtIteratorBase; 91 class TemplateArgument; 92 class TemplateArgumentLoc; 93 class TemplateArgumentListInfo; 94 class Type; 95 class ElaboratedType; 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 { 126 /// The maximum supported address space number. 127 /// 24 bits should be enough for anyone. 128 MaxAddressSpace = 0xffffffu, 129 130 /// The width of the "fast" qualifier mask. 131 FastWidth = 2, 132 133 /// The fast qualifier mask. 134 FastMask = (1 << FastWidth) - 1 135 }; 136 137 Qualifiers() : Mask(0) {} 138 139 static Qualifiers fromFastMask(unsigned Mask) { 140 Qualifiers Qs; 141 Qs.addFastQualifiers(Mask); 142 return Qs; 143 } 144 145 static Qualifiers fromCVRMask(unsigned CVR) { 146 Qualifiers Qs; 147 Qs.addCVRQualifiers(CVR); 148 return Qs; 149 } 150 151 // Deserialize qualifiers from an opaque representation. 152 static Qualifiers fromOpaqueValue(unsigned opaque) { 153 Qualifiers Qs; 154 Qs.Mask = opaque; 155 return Qs; 156 } 157 158 // Serialize these qualifiers into an opaque representation. 159 unsigned getAsOpaqueValue() const { 160 return Mask; 161 } 162 163 bool hasConst() const { return Mask & Const; } 164 void setConst(bool flag) { 165 Mask = (Mask & ~Const) | (flag ? Const : 0); 166 } 167 void removeConst() { Mask &= ~Const; } 168 void addConst() { Mask |= Const; } 169 170 bool hasVolatile() const { return Mask & Volatile; } 171 void setVolatile(bool flag) { 172 Mask = (Mask & ~Volatile) | (flag ? Volatile : 0); 173 } 174 void removeVolatile() { Mask &= ~Volatile; } 175 void addVolatile() { Mask |= Volatile; } 176 177 bool hasRestrict() const { return Mask & Restrict; } 178 void setRestrict(bool flag) { 179 Mask = (Mask & ~Restrict) | (flag ? Restrict : 0); 180 } 181 void removeRestrict() { Mask &= ~Restrict; } 182 void addRestrict() { Mask |= Restrict; } 183 184 bool hasCVRQualifiers() const { return getCVRQualifiers(); } 185 unsigned getCVRQualifiers() const { return Mask & CVRMask; } 186 void setCVRQualifiers(unsigned mask) { 187 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits"); 188 Mask = (Mask & ~CVRMask) | mask; 189 } 190 void removeCVRQualifiers(unsigned mask) { 191 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits"); 192 Mask &= ~mask; 193 } 194 void removeCVRQualifiers() { 195 removeCVRQualifiers(CVRMask); 196 } 197 void addCVRQualifiers(unsigned mask) { 198 assert(!(mask & ~CVRMask) && "bitmask contains non-CVR bits"); 199 Mask |= mask; 200 } 201 202 bool hasObjCGCAttr() const { return Mask & GCAttrMask; } 203 GC getObjCGCAttr() const { return GC((Mask & GCAttrMask) >> GCAttrShift); } 204 void setObjCGCAttr(GC type) { 205 Mask = (Mask & ~GCAttrMask) | (type << GCAttrShift); 206 } 207 void removeObjCGCAttr() { setObjCGCAttr(GCNone); } 208 void addObjCGCAttr(GC type) { 209 assert(type); 210 setObjCGCAttr(type); 211 } 212 213 bool hasAddressSpace() const { return Mask & AddressSpaceMask; } 214 unsigned getAddressSpace() const { return Mask >> AddressSpaceShift; } 215 void setAddressSpace(unsigned space) { 216 assert(space <= MaxAddressSpace); 217 Mask = (Mask & ~AddressSpaceMask) 218 | (((uint32_t) space) << AddressSpaceShift); 219 } 220 void removeAddressSpace() { setAddressSpace(0); } 221 void addAddressSpace(unsigned space) { 222 assert(space); 223 setAddressSpace(space); 224 } 225 226 // Fast qualifiers are those that can be allocated directly 227 // on a QualType object. 228 bool hasFastQualifiers() const { return getFastQualifiers(); } 229 unsigned getFastQualifiers() const { return Mask & FastMask; } 230 void setFastQualifiers(unsigned mask) { 231 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"); 232 Mask = (Mask & ~FastMask) | mask; 233 } 234 void removeFastQualifiers(unsigned mask) { 235 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"); 236 Mask &= ~mask; 237 } 238 void removeFastQualifiers() { 239 removeFastQualifiers(FastMask); 240 } 241 void addFastQualifiers(unsigned mask) { 242 assert(!(mask & ~FastMask) && "bitmask contains non-fast qualifier bits"); 243 Mask |= mask; 244 } 245 246 /// hasNonFastQualifiers - Return true if the set contains any 247 /// qualifiers which require an ExtQuals node to be allocated. 248 bool hasNonFastQualifiers() const { return Mask & ~FastMask; } 249 Qualifiers getNonFastQualifiers() const { 250 Qualifiers Quals = *this; 251 Quals.setFastQualifiers(0); 252 return Quals; 253 } 254 255 /// hasQualifiers - Return true if the set contains any qualifiers. 256 bool hasQualifiers() const { return Mask; } 257 bool empty() const { return !Mask; } 258 259 /// \brief Add the qualifiers from the given set to this set. 260 void addQualifiers(Qualifiers Q) { 261 // If the other set doesn't have any non-boolean qualifiers, just 262 // bit-or it in. 263 if (!(Q.Mask & ~CVRMask)) 264 Mask |= Q.Mask; 265 else { 266 Mask |= (Q.Mask & CVRMask); 267 if (Q.hasAddressSpace()) 268 addAddressSpace(Q.getAddressSpace()); 269 if (Q.hasObjCGCAttr()) 270 addObjCGCAttr(Q.getObjCGCAttr()); 271 } 272 } 273 274 bool isSupersetOf(Qualifiers Other) const; 275 276 bool operator==(Qualifiers Other) const { return Mask == Other.Mask; } 277 bool operator!=(Qualifiers Other) const { return Mask != Other.Mask; } 278 279 operator bool() const { return hasQualifiers(); } 280 281 Qualifiers &operator+=(Qualifiers R) { 282 addQualifiers(R); 283 return *this; 284 } 285 286 // Union two qualifier sets. If an enumerated qualifier appears 287 // in both sets, use the one from the right. 288 friend Qualifiers operator+(Qualifiers L, Qualifiers R) { 289 L += R; 290 return L; 291 } 292 293 Qualifiers &operator-=(Qualifiers R) { 294 Mask = Mask & ~(R.Mask); 295 return *this; 296 } 297 298 /// \brief Compute the difference between two qualifier sets. 299 friend Qualifiers operator-(Qualifiers L, Qualifiers R) { 300 L -= R; 301 return L; 302 } 303 304 std::string getAsString() const; 305 std::string getAsString(const PrintingPolicy &Policy) const { 306 std::string Buffer; 307 getAsStringInternal(Buffer, Policy); 308 return Buffer; 309 } 310 void getAsStringInternal(std::string &S, const PrintingPolicy &Policy) const; 311 312 void Profile(llvm::FoldingSetNodeID &ID) const { 313 ID.AddInteger(Mask); 314 } 315 316private: 317 318 // bits: |0 1 2|3 .. 4|5 .. 31| 319 // |C R V|GCAttr|AddrSpace| 320 uint32_t Mask; 321 322 static const uint32_t GCAttrMask = 0x18; 323 static const uint32_t GCAttrShift = 3; 324 static const uint32_t AddressSpaceMask = ~(CVRMask | GCAttrMask); 325 static const uint32_t AddressSpaceShift = 5; 326}; 327 328 329/// ExtQuals - We can encode up to three bits in the low bits of a 330/// type pointer, but there are many more type qualifiers that we want 331/// to be able to apply to an arbitrary type. Therefore we have this 332/// struct, intended to be heap-allocated and used by QualType to 333/// store qualifiers. 334/// 335/// The current design tags the 'const' and 'restrict' qualifiers in 336/// two low bits on the QualType pointer; a third bit records whether 337/// the pointer is an ExtQuals node. 'const' was chosen because it is 338/// orders of magnitude more common than the other two qualifiers, in 339/// both library and user code. It's relatively rare to see 340/// 'restrict' in user code, but many standard C headers are saturated 341/// with 'restrict' declarations, so that representing them efficiently 342/// is a critical goal of this representation. 343class ExtQuals : public llvm::FoldingSetNode { 344 // NOTE: changing the fast qualifiers should be straightforward as 345 // long as you don't make 'const' non-fast. 346 // 1. Qualifiers: 347 // a) Modify the bitmasks (Qualifiers::TQ and DeclSpec::TQ). 348 // Fast qualifiers must occupy the low-order bits. 349 // b) Update Qualifiers::FastWidth and FastMask. 350 // 2. QualType: 351 // a) Update is{Volatile,Restrict}Qualified(), defined inline. 352 // b) Update remove{Volatile,Restrict}, defined near the end of 353 // this header. 354 // 3. ASTContext: 355 // a) Update get{Volatile,Restrict}Type. 356 357 /// Context - the context to which this set belongs. We save this 358 /// here so that QualifierCollector can use it to reapply extended 359 /// qualifiers to an arbitrary type without requiring a context to 360 /// be pushed through every single API dealing with qualifiers. 361 ASTContext& Context; 362 363 /// BaseType - the underlying type that this qualifies 364 const Type *BaseType; 365 366 /// Quals - the immutable set of qualifiers applied by this 367 /// node; always contains extended qualifiers. 368 Qualifiers Quals; 369 370public: 371 ExtQuals(ASTContext& Context, const Type *Base, Qualifiers Quals) 372 : Context(Context), BaseType(Base), Quals(Quals) 373 { 374 assert(Quals.hasNonFastQualifiers() 375 && "ExtQuals created with no fast qualifiers"); 376 assert(!Quals.hasFastQualifiers() 377 && "ExtQuals created with fast qualifiers"); 378 } 379 380 Qualifiers getQualifiers() const { return Quals; } 381 382 bool hasVolatile() const { return Quals.hasVolatile(); } 383 384 bool hasObjCGCAttr() const { return Quals.hasObjCGCAttr(); } 385 Qualifiers::GC getObjCGCAttr() const { return Quals.getObjCGCAttr(); } 386 387 bool hasAddressSpace() const { return Quals.hasAddressSpace(); } 388 unsigned getAddressSpace() const { return Quals.getAddressSpace(); } 389 390 const Type *getBaseType() const { return BaseType; } 391 392 ASTContext &getContext() const { return Context; } 393 394public: 395 void Profile(llvm::FoldingSetNodeID &ID) const { 396 Profile(ID, getBaseType(), Quals); 397 } 398 static void Profile(llvm::FoldingSetNodeID &ID, 399 const Type *BaseType, 400 Qualifiers Quals) { 401 assert(!Quals.hasFastQualifiers() && "fast qualifiers in ExtQuals hash!"); 402 ID.AddPointer(BaseType); 403 Quals.Profile(ID); 404 } 405}; 406 407/// CallingConv - Specifies the calling convention that a function uses. 408enum CallingConv { 409 CC_Default, 410 CC_C, // __attribute__((cdecl)) 411 CC_X86StdCall, // __attribute__((stdcall)) 412 CC_X86FastCall, // __attribute__((fastcall)) 413 CC_X86ThisCall, // __attribute__((thiscall)) 414 CC_X86Pascal // __attribute__((pascal)) 415}; 416 417 418/// QualType - For efficiency, we don't store CV-qualified types as nodes on 419/// their own: instead each reference to a type stores the qualifiers. This 420/// greatly reduces the number of nodes we need to allocate for types (for 421/// example we only need one for 'int', 'const int', 'volatile int', 422/// 'const volatile int', etc). 423/// 424/// As an added efficiency bonus, instead of making this a pair, we 425/// just store the two bits we care about in the low bits of the 426/// pointer. To handle the packing/unpacking, we make QualType be a 427/// simple wrapper class that acts like a smart pointer. A third bit 428/// indicates whether there are extended qualifiers present, in which 429/// case the pointer points to a special structure. 430class QualType { 431 // Thankfully, these are efficiently composable. 432 llvm::PointerIntPair<llvm::PointerUnion<const Type*,const ExtQuals*>, 433 Qualifiers::FastWidth> Value; 434 435 const ExtQuals *getExtQualsUnsafe() const { 436 return Value.getPointer().get<const ExtQuals*>(); 437 } 438 439 const Type *getTypePtrUnsafe() const { 440 return Value.getPointer().get<const Type*>(); 441 } 442 443 QualType getUnqualifiedTypeSlow() const; 444 445 friend class QualifierCollector; 446public: 447 QualType() {} 448 449 QualType(const Type *Ptr, unsigned Quals) 450 : Value(Ptr, Quals) {} 451 QualType(const ExtQuals *Ptr, unsigned Quals) 452 : Value(Ptr, Quals) {} 453 454 unsigned getLocalFastQualifiers() const { return Value.getInt(); } 455 void setLocalFastQualifiers(unsigned Quals) { Value.setInt(Quals); } 456 457 /// Retrieves a pointer to the underlying (unqualified) type. 458 /// This should really return a const Type, but it's not worth 459 /// changing all the users right now. 460 Type *getTypePtr() const { 461 if (hasLocalNonFastQualifiers()) 462 return const_cast<Type*>(getExtQualsUnsafe()->getBaseType()); 463 return const_cast<Type*>(getTypePtrUnsafe()); 464 } 465 466 void *getAsOpaquePtr() const { return Value.getOpaqueValue(); } 467 static QualType getFromOpaquePtr(void *Ptr) { 468 QualType T; 469 T.Value.setFromOpaqueValue(Ptr); 470 return T; 471 } 472 473 Type &operator*() const { 474 return *getTypePtr(); 475 } 476 477 Type *operator->() const { 478 return getTypePtr(); 479 } 480 481 bool isCanonical() const; 482 bool isCanonicalAsParam() const; 483 484 /// isNull - Return true if this QualType doesn't point to a type yet. 485 bool isNull() const { 486 return Value.getPointer().isNull(); 487 } 488 489 /// \brief Determine whether this particular QualType instance has the 490 /// "const" qualifier set, without looking through typedefs that may have 491 /// added "const" at a different level. 492 bool isLocalConstQualified() const { 493 return (getLocalFastQualifiers() & Qualifiers::Const); 494 } 495 496 /// \brief Determine whether this type is const-qualified. 497 bool isConstQualified() const; 498 499 /// \brief Determine whether this particular QualType instance has the 500 /// "restrict" qualifier set, without looking through typedefs that may have 501 /// added "restrict" at a different level. 502 bool isLocalRestrictQualified() const { 503 return (getLocalFastQualifiers() & Qualifiers::Restrict); 504 } 505 506 /// \brief Determine whether this type is restrict-qualified. 507 bool isRestrictQualified() const; 508 509 /// \brief Determine whether this particular QualType instance has the 510 /// "volatile" qualifier set, without looking through typedefs that may have 511 /// added "volatile" at a different level. 512 bool isLocalVolatileQualified() const { 513 return (hasLocalNonFastQualifiers() && getExtQualsUnsafe()->hasVolatile()); 514 } 515 516 /// \brief Determine whether this type is volatile-qualified. 517 bool isVolatileQualified() const; 518 519 /// \brief Determine whether this particular QualType instance has any 520 /// qualifiers, without looking through any typedefs that might add 521 /// qualifiers at a different level. 522 bool hasLocalQualifiers() const { 523 return getLocalFastQualifiers() || hasLocalNonFastQualifiers(); 524 } 525 526 /// \brief Determine whether this type has any qualifiers. 527 bool hasQualifiers() const; 528 529 /// \brief Determine whether this particular QualType instance has any 530 /// "non-fast" qualifiers, e.g., those that are stored in an ExtQualType 531 /// instance. 532 bool hasLocalNonFastQualifiers() const { 533 return Value.getPointer().is<const ExtQuals*>(); 534 } 535 536 /// \brief Retrieve the set of qualifiers local to this particular QualType 537 /// instance, not including any qualifiers acquired through typedefs or 538 /// other sugar. 539 Qualifiers getLocalQualifiers() const { 540 Qualifiers Quals; 541 if (hasLocalNonFastQualifiers()) 542 Quals = getExtQualsUnsafe()->getQualifiers(); 543 Quals.addFastQualifiers(getLocalFastQualifiers()); 544 return Quals; 545 } 546 547 /// \brief Retrieve the set of qualifiers applied to this type. 548 Qualifiers getQualifiers() const; 549 550 /// \brief Retrieve the set of CVR (const-volatile-restrict) qualifiers 551 /// local to this particular QualType instance, not including any qualifiers 552 /// acquired through typedefs or other sugar. 553 unsigned getLocalCVRQualifiers() const { 554 unsigned CVR = getLocalFastQualifiers(); 555 if (isLocalVolatileQualified()) 556 CVR |= Qualifiers::Volatile; 557 return CVR; 558 } 559 560 /// \brief Retrieve the set of CVR (const-volatile-restrict) qualifiers 561 /// applied to this type. 562 unsigned getCVRQualifiers() const; 563 564 /// \brief Retrieve the set of CVR (const-volatile-restrict) qualifiers 565 /// applied to this type, looking through any number of unqualified array 566 /// types to their element types' qualifiers. 567 unsigned getCVRQualifiersThroughArrayTypes() const; 568 569 bool isConstant(ASTContext& Ctx) const { 570 return QualType::isConstant(*this, Ctx); 571 } 572 573 // Don't promise in the API that anything besides 'const' can be 574 // easily added. 575 576 /// addConst - add the specified type qualifier to this QualType. 577 void addConst() { 578 addFastQualifiers(Qualifiers::Const); 579 } 580 QualType withConst() const { 581 return withFastQualifiers(Qualifiers::Const); 582 } 583 584 void addFastQualifiers(unsigned TQs) { 585 assert(!(TQs & ~Qualifiers::FastMask) 586 && "non-fast qualifier bits set in mask!"); 587 Value.setInt(Value.getInt() | TQs); 588 } 589 590 // FIXME: The remove* functions are semantically broken, because they might 591 // not remove a qualifier stored on a typedef. Most of the with* functions 592 // have the same problem. 593 void removeConst(); 594 void removeVolatile(); 595 void removeRestrict(); 596 void removeCVRQualifiers(unsigned Mask); 597 598 void removeFastQualifiers() { Value.setInt(0); } 599 void removeFastQualifiers(unsigned Mask) { 600 assert(!(Mask & ~Qualifiers::FastMask) && "mask has non-fast qualifiers"); 601 Value.setInt(Value.getInt() & ~Mask); 602 } 603 604 // Creates a type with the given qualifiers in addition to any 605 // qualifiers already on this type. 606 QualType withFastQualifiers(unsigned TQs) const { 607 QualType T = *this; 608 T.addFastQualifiers(TQs); 609 return T; 610 } 611 612 // Creates a type with exactly the given fast qualifiers, removing 613 // any existing fast qualifiers. 614 QualType withExactFastQualifiers(unsigned TQs) const { 615 return withoutFastQualifiers().withFastQualifiers(TQs); 616 } 617 618 // Removes fast qualifiers, but leaves any extended qualifiers in place. 619 QualType withoutFastQualifiers() const { 620 QualType T = *this; 621 T.removeFastQualifiers(); 622 return T; 623 } 624 625 /// \brief Return this type with all of the instance-specific qualifiers 626 /// removed, but without removing any qualifiers that may have been applied 627 /// through typedefs. 628 QualType getLocalUnqualifiedType() const { return QualType(getTypePtr(), 0); } 629 630 /// \brief Return the unqualified form of the given type, which might be 631 /// desugared to eliminate qualifiers introduced via typedefs. 632 QualType getUnqualifiedType() const { 633 QualType T = getLocalUnqualifiedType(); 634 if (!T.hasQualifiers()) 635 return T; 636 637 return getUnqualifiedTypeSlow(); 638 } 639 640 bool isMoreQualifiedThan(QualType Other) const; 641 bool isAtLeastAsQualifiedAs(QualType Other) const; 642 QualType getNonReferenceType() const; 643 644 /// \brief Determine the type of a (typically non-lvalue) expression with the 645 /// specified result type. 646 /// 647 /// This routine should be used for expressions for which the return type is 648 /// explicitly specified (e.g., in a cast or call) and isn't necessarily 649 /// an lvalue. It removes a top-level reference (since there are no 650 /// expressions of reference type) and deletes top-level cvr-qualifiers 651 /// from non-class types (in C++) or all types (in C). 652 QualType getNonLValueExprType(ASTContext &Context) const; 653 654 /// getDesugaredType - Return the specified type with any "sugar" removed from 655 /// the type. This takes off typedefs, typeof's etc. If the outer level of 656 /// the type is already concrete, it returns it unmodified. This is similar 657 /// to getting the canonical type, but it doesn't remove *all* typedefs. For 658 /// example, it returns "T*" as "T*", (not as "int*"), because the pointer is 659 /// concrete. 660 /// 661 /// Qualifiers are left in place. 662 QualType getDesugaredType() const { 663 return QualType::getDesugaredType(*this); 664 } 665 666 /// operator==/!= - Indicate whether the specified types and qualifiers are 667 /// identical. 668 friend bool operator==(const QualType &LHS, const QualType &RHS) { 669 return LHS.Value == RHS.Value; 670 } 671 friend bool operator!=(const QualType &LHS, const QualType &RHS) { 672 return LHS.Value != RHS.Value; 673 } 674 std::string getAsString() const; 675 676 std::string getAsString(const PrintingPolicy &Policy) const { 677 std::string S; 678 getAsStringInternal(S, Policy); 679 return S; 680 } 681 void getAsStringInternal(std::string &Str, 682 const PrintingPolicy &Policy) const; 683 684 void dump(const char *s) const; 685 void dump() const; 686 687 void Profile(llvm::FoldingSetNodeID &ID) const { 688 ID.AddPointer(getAsOpaquePtr()); 689 } 690 691 /// getAddressSpace - Return the address space of this type. 692 inline unsigned getAddressSpace() const; 693 694 /// GCAttrTypesAttr - Returns gc attribute of this type. 695 inline Qualifiers::GC getObjCGCAttr() const; 696 697 /// isObjCGCWeak true when Type is objc's weak. 698 bool isObjCGCWeak() const { 699 return getObjCGCAttr() == Qualifiers::Weak; 700 } 701 702 /// isObjCGCStrong true when Type is objc's strong. 703 bool isObjCGCStrong() const { 704 return getObjCGCAttr() == Qualifiers::Strong; 705 } 706 707private: 708 // These methods are implemented in a separate translation unit; 709 // "static"-ize them to avoid creating temporary QualTypes in the 710 // caller. 711 static bool isConstant(QualType T, ASTContext& Ctx); 712 static QualType getDesugaredType(QualType T); 713}; 714 715} // end clang. 716 717namespace llvm { 718/// Implement simplify_type for QualType, so that we can dyn_cast from QualType 719/// to a specific Type class. 720template<> struct simplify_type<const ::clang::QualType> { 721 typedef ::clang::Type* SimpleType; 722 static SimpleType getSimplifiedValue(const ::clang::QualType &Val) { 723 return Val.getTypePtr(); 724 } 725}; 726template<> struct simplify_type< ::clang::QualType> 727 : public simplify_type<const ::clang::QualType> {}; 728 729// Teach SmallPtrSet that QualType is "basically a pointer". 730template<> 731class PointerLikeTypeTraits<clang::QualType> { 732public: 733 static inline void *getAsVoidPointer(clang::QualType P) { 734 return P.getAsOpaquePtr(); 735 } 736 static inline clang::QualType getFromVoidPointer(void *P) { 737 return clang::QualType::getFromOpaquePtr(P); 738 } 739 // Various qualifiers go in low bits. 740 enum { NumLowBitsAvailable = 0 }; 741}; 742 743} // end namespace llvm 744 745namespace clang { 746 747/// Type - This is the base class of the type hierarchy. A central concept 748/// with types is that each type always has a canonical type. A canonical type 749/// is the type with any typedef names stripped out of it or the types it 750/// references. For example, consider: 751/// 752/// typedef int foo; 753/// typedef foo* bar; 754/// 'int *' 'foo *' 'bar' 755/// 756/// There will be a Type object created for 'int'. Since int is canonical, its 757/// canonicaltype pointer points to itself. There is also a Type for 'foo' (a 758/// TypedefType). Its CanonicalType pointer points to the 'int' Type. Next 759/// there is a PointerType that represents 'int*', which, like 'int', is 760/// canonical. Finally, there is a PointerType type for 'foo*' whose canonical 761/// type is 'int*', and there is a TypedefType for 'bar', whose canonical type 762/// is also 'int*'. 763/// 764/// Non-canonical types are useful for emitting diagnostics, without losing 765/// information about typedefs being used. Canonical types are useful for type 766/// comparisons (they allow by-pointer equality tests) and useful for reasoning 767/// about whether something has a particular form (e.g. is a function type), 768/// because they implicitly, recursively, strip all typedefs out of a type. 769/// 770/// Types, once created, are immutable. 771/// 772class Type { 773public: 774 enum TypeClass { 775#define TYPE(Class, Base) Class, 776#define LAST_TYPE(Class) TypeLast = Class, 777#define ABSTRACT_TYPE(Class, Base) 778#include "clang/AST/TypeNodes.def" 779 TagFirst = Record, TagLast = Enum 780 }; 781 782private: 783 Type(const Type&); // DO NOT IMPLEMENT. 784 void operator=(const Type&); // DO NOT IMPLEMENT. 785 786 QualType CanonicalType; 787 788 /// TypeClass bitfield - Enum that specifies what subclass this belongs to. 789 unsigned TC : 8; 790 791 /// Dependent - Whether this type is a dependent type (C++ [temp.dep.type]). 792 /// Note that this should stay at the end of the ivars for Type so that 793 /// subclasses can pack their bitfields into the same word. 794 bool Dependent : 1; 795 796 /// \brief Whether the linkage of this type is already known. 797 mutable bool LinkageKnown : 1; 798 799 /// \brief Linkage of this type. 800 mutable unsigned CachedLinkage : 2; 801 802 /// \brief FromAST - Whether this type comes from an AST file. 803 mutable bool FromAST : 1; 804 805 /// \brief Set whether this type comes from an AST file. 806 void setFromAST(bool V = true) const { 807 FromAST = V; 808 } 809 810protected: 811 /// \brief Compute the linkage of this type. 812 virtual Linkage getLinkageImpl() const; 813 814 enum { BitsRemainingInType = 19 }; 815 816 // silence VC++ warning C4355: 'this' : used in base member initializer list 817 Type *this_() { return this; } 818 Type(TypeClass tc, QualType Canonical, bool dependent) 819 : CanonicalType(Canonical.isNull() ? QualType(this_(), 0) : Canonical), 820 TC(tc), Dependent(dependent), LinkageKnown(false), 821 CachedLinkage(NoLinkage), FromAST(false) {} 822 virtual ~Type(); 823 friend class ASTContext; 824 825public: 826 TypeClass getTypeClass() const { return static_cast<TypeClass>(TC); } 827 828 /// \brief Whether this type comes from an AST file. 829 bool isFromAST() const { return FromAST; } 830 831 bool isCanonicalUnqualified() const { 832 return CanonicalType.getTypePtr() == this; 833 } 834 835 /// Types are partitioned into 3 broad categories (C99 6.2.5p1): 836 /// object types, function types, and incomplete types. 837 838 /// isIncompleteType - Return true if this is an incomplete type. 839 /// A type that can describe objects, but which lacks information needed to 840 /// determine its size (e.g. void, or a fwd declared struct). Clients of this 841 /// routine will need to determine if the size is actually required. 842 bool isIncompleteType() const; 843 844 /// isIncompleteOrObjectType - Return true if this is an incomplete or object 845 /// type, in other words, not a function type. 846 bool isIncompleteOrObjectType() const { 847 return !isFunctionType(); 848 } 849 850 /// isPODType - Return true if this is a plain-old-data type (C++ 3.9p10). 851 bool isPODType() const; 852 853 /// isLiteralType - Return true if this is a literal type 854 /// (C++0x [basic.types]p10) 855 bool isLiteralType() const; 856 857 /// isVariablyModifiedType (C99 6.7.5.2p2) - Return true for variable array 858 /// types that have a non-constant expression. This does not include "[]". 859 bool isVariablyModifiedType() const; 860 861 /// Helper methods to distinguish type categories. All type predicates 862 /// operate on the canonical type, ignoring typedefs and qualifiers. 863 864 /// isBuiltinType - returns true if the type is a builtin type. 865 bool isBuiltinType() const; 866 867 /// isSpecificBuiltinType - Test for a particular builtin type. 868 bool isSpecificBuiltinType(unsigned K) const; 869 870 /// isIntegerType() does *not* include complex integers (a GCC extension). 871 /// isComplexIntegerType() can be used to test for complex integers. 872 bool isIntegerType() const; // C99 6.2.5p17 (int, char, bool, enum) 873 bool isEnumeralType() const; 874 bool isBooleanType() const; 875 bool isCharType() const; 876 bool isWideCharType() const; 877 bool isAnyCharacterType() const; 878 bool isIntegralType(ASTContext &Ctx) const; 879 880 /// \brief Determine whether this type is an integral or enumeration type. 881 bool isIntegralOrEnumerationType() const; 882 883 /// Floating point categories. 884 bool isRealFloatingType() const; // C99 6.2.5p10 (float, double, long double) 885 /// isComplexType() does *not* include complex integers (a GCC extension). 886 /// isComplexIntegerType() can be used to test for complex integers. 887 bool isComplexType() const; // C99 6.2.5p11 (complex) 888 bool isAnyComplexType() const; // C99 6.2.5p11 (complex) + Complex Int. 889 bool isFloatingType() const; // C99 6.2.5p11 (real floating + complex) 890 bool isRealType() const; // C99 6.2.5p17 (real floating + integer) 891 bool isArithmeticType() const; // C99 6.2.5p18 (integer + floating) 892 bool isVoidType() const; // C99 6.2.5p19 893 bool isDerivedType() const; // C99 6.2.5p20 894 bool isScalarType() const; // C99 6.2.5p21 (arithmetic + pointers) 895 bool isAggregateType() const; 896 897 // Type Predicates: Check to see if this type is structurally the specified 898 // type, ignoring typedefs and qualifiers. 899 bool isFunctionType() const; 900 bool isFunctionNoProtoType() const { return getAs<FunctionNoProtoType>(); } 901 bool isFunctionProtoType() const { return getAs<FunctionProtoType>(); } 902 bool isPointerType() const; 903 bool isAnyPointerType() const; // Any C pointer or ObjC object pointer 904 bool isBlockPointerType() const; 905 bool isVoidPointerType() const; 906 bool isReferenceType() const; 907 bool isLValueReferenceType() const; 908 bool isRValueReferenceType() const; 909 bool isFunctionPointerType() const; 910 bool isMemberPointerType() const; 911 bool isMemberFunctionPointerType() const; 912 bool isMemberDataPointerType() const; 913 bool isArrayType() const; 914 bool isConstantArrayType() const; 915 bool isIncompleteArrayType() const; 916 bool isVariableArrayType() const; 917 bool isDependentSizedArrayType() const; 918 bool isRecordType() const; 919 bool isClassType() const; 920 bool isStructureType() const; 921 bool isStructureOrClassType() const; 922 bool isUnionType() const; 923 bool isComplexIntegerType() const; // GCC _Complex integer type. 924 bool isVectorType() const; // GCC vector type. 925 bool isExtVectorType() const; // Extended vector type. 926 bool isObjCObjectPointerType() const; // Pointer to *any* ObjC object. 927 // FIXME: change this to 'raw' interface type, so we can used 'interface' type 928 // for the common case. 929 bool isObjCObjectType() const; // NSString or typeof(*(id)0) 930 bool isObjCQualifiedInterfaceType() const; // NSString<foo> 931 bool isObjCQualifiedIdType() const; // id<foo> 932 bool isObjCQualifiedClassType() const; // Class<foo> 933 bool isObjCObjectOrInterfaceType() const; 934 bool isObjCIdType() const; // id 935 bool isLegacyObjCIdType(ASTContext &) const; // struct_object * 936 bool isObjCClassType() const; // Class 937 bool isLegacyObjCClassType(ASTContext &) const; // struct_class * 938 bool isObjCSelType() const; // Class 939 bool isObjCBuiltinType() const; // 'id' or 'Class' 940 bool isTemplateTypeParmType() const; // C++ template type parameter 941 bool isNullPtrType() const; // C++0x nullptr_t 942 943 /// isDependentType - Whether this type is a dependent type, meaning 944 /// that its definition somehow depends on a template parameter 945 /// (C++ [temp.dep.type]). 946 bool isDependentType() const { return Dependent; } 947 bool isOverloadableType() const; 948 949 /// \brief Determine wither this type is a C++ elaborated-type-specifier. 950 bool isElaboratedTypeSpecifier() const; 951 952 /// hasPointerRepresentation - Whether this type is represented 953 /// natively as a pointer; this includes pointers, references, block 954 /// pointers, and Objective-C interface, qualified id, and qualified 955 /// interface types, as well as nullptr_t. 956 bool hasPointerRepresentation() const; 957 958 /// hasObjCPointerRepresentation - Whether this type can represent 959 /// an objective pointer type for the purpose of GC'ability 960 bool hasObjCPointerRepresentation() const; 961 962 /// \brief Determine whether this type has an integer representation 963 /// of some sort, e.g., it is an integer type or a vector. 964 bool hasIntegerRepresentation() const; 965 966 /// \brief Determine whether this type has an signed integer representation 967 /// of some sort, e.g., it is an signed integer type or a vector. 968 bool hasSignedIntegerRepresentation() const; 969 970 /// \brief Determine whether this type has an unsigned integer representation 971 /// of some sort, e.g., it is an unsigned integer type or a vector. 972 bool hasUnsignedIntegerRepresentation() const; 973 974 /// \brief Determine whether this type has a floating-point representation 975 /// of some sort, e.g., it is a floating-point type or a vector thereof. 976 bool hasFloatingRepresentation() const; 977 978 // Type Checking Functions: Check to see if this type is structurally the 979 // specified type, ignoring typedefs and qualifiers, and return a pointer to 980 // the best type we can. 981 const RecordType *getAsStructureType() const; 982 /// NOTE: getAs*ArrayType are methods on ASTContext. 983 const RecordType *getAsUnionType() const; 984 const ComplexType *getAsComplexIntegerType() const; // GCC complex int type. 985 // The following is a convenience method that returns an ObjCObjectPointerType 986 // for object declared using an interface. 987 const ObjCObjectPointerType *getAsObjCInterfacePointerType() const; 988 const ObjCObjectPointerType *getAsObjCQualifiedIdType() const; 989 const ObjCObjectType *getAsObjCQualifiedInterfaceType() const; 990 const CXXRecordDecl *getCXXRecordDeclForPointerType() const; 991 992 /// \brief Retrieves the CXXRecordDecl that this type refers to, either 993 /// because the type is a RecordType or because it is the injected-class-name 994 /// type of a class template or class template partial specialization. 995 CXXRecordDecl *getAsCXXRecordDecl() const; 996 997 // Member-template getAs<specific type>'. Look through sugar for 998 // an instance of <specific type>. This scheme will eventually 999 // replace the specific getAsXXXX methods above. 1000 // 1001 // There are some specializations of this member template listed 1002 // immediately following this class. 1003 template <typename T> const T *getAs() const; 1004 1005 /// getArrayElementTypeNoTypeQual - If this is an array type, return the 1006 /// element type of the array, potentially with type qualifiers missing. 1007 /// This method should never be used when type qualifiers are meaningful. 1008 const Type *getArrayElementTypeNoTypeQual() const; 1009 1010 /// getPointeeType - If this is a pointer, ObjC object pointer, or block 1011 /// pointer, this returns the respective pointee. 1012 QualType getPointeeType() const; 1013 1014 /// getUnqualifiedDesugaredType() - Return the specified type with 1015 /// any "sugar" removed from the type, removing any typedefs, 1016 /// typeofs, etc., as well as any qualifiers. 1017 const Type *getUnqualifiedDesugaredType() const; 1018 1019 /// More type predicates useful for type checking/promotion 1020 bool isPromotableIntegerType() const; // C99 6.3.1.1p2 1021 1022 /// isSignedIntegerType - Return true if this is an integer type that is 1023 /// signed, according to C99 6.2.5p4 [char, signed char, short, int, long..], 1024 /// an enum decl which has a signed representation, or a vector of signed 1025 /// integer element type. 1026 bool isSignedIntegerType() const; 1027 1028 /// isUnsignedIntegerType - Return true if this is an integer type that is 1029 /// unsigned, according to C99 6.2.5p6 [which returns true for _Bool], an enum 1030 /// decl which has an unsigned representation, or a vector of unsigned integer 1031 /// element type. 1032 bool isUnsignedIntegerType() const; 1033 1034 /// isConstantSizeType - Return true if this is not a variable sized type, 1035 /// according to the rules of C99 6.7.5p3. It is not legal to call this on 1036 /// incomplete types. 1037 bool isConstantSizeType() const; 1038 1039 /// isSpecifierType - Returns true if this type can be represented by some 1040 /// set of type specifiers. 1041 bool isSpecifierType() const; 1042 1043 /// \brief Determine the linkage of this type. 1044 Linkage getLinkage() const; 1045 1046 /// \brief Note that the linkage is no longer known. 1047 void ClearLinkageCache(); 1048 1049 const char *getTypeClassName() const; 1050 1051 QualType getCanonicalTypeInternal() const { 1052 return CanonicalType; 1053 } 1054 CanQualType getCanonicalTypeUnqualified() const; // in CanonicalType.h 1055 void dump() const; 1056 static bool classof(const Type *) { return true; } 1057 1058 friend class ASTReader; 1059 friend class ASTWriter; 1060}; 1061 1062template <> inline const TypedefType *Type::getAs() const { 1063 return dyn_cast<TypedefType>(this); 1064} 1065 1066// We can do canonical leaf types faster, because we don't have to 1067// worry about preserving child type decoration. 1068#define TYPE(Class, Base) 1069#define LEAF_TYPE(Class) \ 1070template <> inline const Class##Type *Type::getAs() const { \ 1071 return dyn_cast<Class##Type>(CanonicalType); \ 1072} 1073#include "clang/AST/TypeNodes.def" 1074 1075 1076/// BuiltinType - This class is used for builtin types like 'int'. Builtin 1077/// types are always canonical and have a literal name field. 1078class BuiltinType : public Type { 1079public: 1080 enum Kind { 1081 Void, 1082 1083 Bool, // This is bool and/or _Bool. 1084 Char_U, // This is 'char' for targets where char is unsigned. 1085 UChar, // This is explicitly qualified unsigned char. 1086 Char16, // This is 'char16_t' for C++. 1087 Char32, // This is 'char32_t' for C++. 1088 UShort, 1089 UInt, 1090 ULong, 1091 ULongLong, 1092 UInt128, // __uint128_t 1093 1094 Char_S, // This is 'char' for targets where char is signed. 1095 SChar, // This is explicitly qualified signed char. 1096 WChar, // This is 'wchar_t' for C++. 1097 Short, 1098 Int, 1099 Long, 1100 LongLong, 1101 Int128, // __int128_t 1102 1103 Float, Double, LongDouble, 1104 1105 NullPtr, // This is the type of C++0x 'nullptr'. 1106 1107 Overload, // This represents the type of an overloaded function declaration. 1108 Dependent, // This represents the type of a type-dependent expression. 1109 1110 UndeducedAuto, // In C++0x, this represents the type of an auto variable 1111 // that has not been deduced yet. 1112 1113 /// The primitive Objective C 'id' type. The type pointed to by the 1114 /// user-visible 'id' type. Only ever shows up in an AST as the base 1115 /// type of an ObjCObjectType. 1116 ObjCId, 1117 1118 /// The primitive Objective C 'Class' type. The type pointed to by the 1119 /// user-visible 'Class' type. Only ever shows up in an AST as the 1120 /// base type of an ObjCObjectType. 1121 ObjCClass, 1122 1123 ObjCSel // This represents the ObjC 'SEL' type. 1124 }; 1125private: 1126 Kind TypeKind; 1127 1128protected: 1129 virtual Linkage getLinkageImpl() const; 1130 1131public: 1132 BuiltinType(Kind K) 1133 : Type(Builtin, QualType(), /*Dependent=*/(K == Dependent)), 1134 TypeKind(K) {} 1135 1136 Kind getKind() const { return TypeKind; } 1137 const char *getName(const LangOptions &LO) const; 1138 1139 bool isSugared() const { return false; } 1140 QualType desugar() const { return QualType(this, 0); } 1141 1142 bool isInteger() const { 1143 return TypeKind >= Bool && TypeKind <= Int128; 1144 } 1145 1146 bool isSignedInteger() const { 1147 return TypeKind >= Char_S && TypeKind <= Int128; 1148 } 1149 1150 bool isUnsignedInteger() const { 1151 return TypeKind >= Bool && TypeKind <= UInt128; 1152 } 1153 1154 bool isFloatingPoint() const { 1155 return TypeKind >= Float && TypeKind <= LongDouble; 1156 } 1157 1158 static bool classof(const Type *T) { return T->getTypeClass() == Builtin; } 1159 static bool classof(const BuiltinType *) { return true; } 1160}; 1161 1162/// ComplexType - C99 6.2.5p11 - Complex values. This supports the C99 complex 1163/// types (_Complex float etc) as well as the GCC integer complex extensions. 1164/// 1165class ComplexType : public Type, public llvm::FoldingSetNode { 1166 QualType ElementType; 1167 ComplexType(QualType Element, QualType CanonicalPtr) : 1168 Type(Complex, CanonicalPtr, Element->isDependentType()), 1169 ElementType(Element) { 1170 } 1171 friend class ASTContext; // ASTContext creates these. 1172 1173protected: 1174 virtual Linkage getLinkageImpl() const; 1175 1176public: 1177 QualType getElementType() const { return ElementType; } 1178 1179 bool isSugared() const { return false; } 1180 QualType desugar() const { return QualType(this, 0); } 1181 1182 void Profile(llvm::FoldingSetNodeID &ID) { 1183 Profile(ID, getElementType()); 1184 } 1185 static void Profile(llvm::FoldingSetNodeID &ID, QualType Element) { 1186 ID.AddPointer(Element.getAsOpaquePtr()); 1187 } 1188 1189 static bool classof(const Type *T) { return T->getTypeClass() == Complex; } 1190 static bool classof(const ComplexType *) { return true; } 1191}; 1192 1193/// PointerType - C99 6.7.5.1 - Pointer Declarators. 1194/// 1195class PointerType : public Type, public llvm::FoldingSetNode { 1196 QualType PointeeType; 1197 1198 PointerType(QualType Pointee, QualType CanonicalPtr) : 1199 Type(Pointer, CanonicalPtr, Pointee->isDependentType()), PointeeType(Pointee) { 1200 } 1201 friend class ASTContext; // ASTContext creates these. 1202 1203protected: 1204 virtual Linkage getLinkageImpl() const; 1205 1206public: 1207 1208 QualType getPointeeType() const { return PointeeType; } 1209 1210 bool isSugared() const { return false; } 1211 QualType desugar() const { return QualType(this, 0); } 1212 1213 void Profile(llvm::FoldingSetNodeID &ID) { 1214 Profile(ID, getPointeeType()); 1215 } 1216 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee) { 1217 ID.AddPointer(Pointee.getAsOpaquePtr()); 1218 } 1219 1220 static bool classof(const Type *T) { return T->getTypeClass() == Pointer; } 1221 static bool classof(const PointerType *) { return true; } 1222}; 1223 1224/// BlockPointerType - pointer to a block type. 1225/// This type is to represent types syntactically represented as 1226/// "void (^)(int)", etc. Pointee is required to always be a function type. 1227/// 1228class BlockPointerType : public Type, public llvm::FoldingSetNode { 1229 QualType PointeeType; // Block is some kind of pointer type 1230 BlockPointerType(QualType Pointee, QualType CanonicalCls) : 1231 Type(BlockPointer, CanonicalCls, Pointee->isDependentType()), 1232 PointeeType(Pointee) { 1233 } 1234 friend class ASTContext; // ASTContext creates these. 1235 1236protected: 1237 virtual Linkage getLinkageImpl() const; 1238 1239public: 1240 1241 // Get the pointee type. Pointee is required to always be a function type. 1242 QualType getPointeeType() const { return PointeeType; } 1243 1244 bool isSugared() const { return false; } 1245 QualType desugar() const { return QualType(this, 0); } 1246 1247 void Profile(llvm::FoldingSetNodeID &ID) { 1248 Profile(ID, getPointeeType()); 1249 } 1250 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee) { 1251 ID.AddPointer(Pointee.getAsOpaquePtr()); 1252 } 1253 1254 static bool classof(const Type *T) { 1255 return T->getTypeClass() == BlockPointer; 1256 } 1257 static bool classof(const BlockPointerType *) { return true; } 1258}; 1259 1260/// ReferenceType - Base for LValueReferenceType and RValueReferenceType 1261/// 1262class ReferenceType : public Type, public llvm::FoldingSetNode { 1263 QualType PointeeType; 1264 1265 /// True if the type was originally spelled with an lvalue sigil. 1266 /// This is never true of rvalue references but can also be false 1267 /// on lvalue references because of C++0x [dcl.typedef]p9, 1268 /// as follows: 1269 /// 1270 /// typedef int &ref; // lvalue, spelled lvalue 1271 /// typedef int &&rvref; // rvalue 1272 /// ref &a; // lvalue, inner ref, spelled lvalue 1273 /// ref &&a; // lvalue, inner ref 1274 /// rvref &a; // lvalue, inner ref, spelled lvalue 1275 /// rvref &&a; // rvalue, inner ref 1276 bool SpelledAsLValue; 1277 1278 /// True if the inner type is a reference type. This only happens 1279 /// in non-canonical forms. 1280 bool InnerRef; 1281 1282protected: 1283 ReferenceType(TypeClass tc, QualType Referencee, QualType CanonicalRef, 1284 bool SpelledAsLValue) : 1285 Type(tc, CanonicalRef, Referencee->isDependentType()), 1286 PointeeType(Referencee), SpelledAsLValue(SpelledAsLValue), 1287 InnerRef(Referencee->isReferenceType()) { 1288 } 1289 1290 virtual Linkage getLinkageImpl() const; 1291 1292public: 1293 bool isSpelledAsLValue() const { return SpelledAsLValue; } 1294 bool isInnerRef() const { return InnerRef; } 1295 1296 QualType getPointeeTypeAsWritten() const { return PointeeType; } 1297 QualType getPointeeType() const { 1298 // FIXME: this might strip inner qualifiers; okay? 1299 const ReferenceType *T = this; 1300 while (T->InnerRef) 1301 T = T->PointeeType->getAs<ReferenceType>(); 1302 return T->PointeeType; 1303 } 1304 1305 void Profile(llvm::FoldingSetNodeID &ID) { 1306 Profile(ID, PointeeType, SpelledAsLValue); 1307 } 1308 static void Profile(llvm::FoldingSetNodeID &ID, 1309 QualType Referencee, 1310 bool SpelledAsLValue) { 1311 ID.AddPointer(Referencee.getAsOpaquePtr()); 1312 ID.AddBoolean(SpelledAsLValue); 1313 } 1314 1315 static bool classof(const Type *T) { 1316 return T->getTypeClass() == LValueReference || 1317 T->getTypeClass() == RValueReference; 1318 } 1319 static bool classof(const ReferenceType *) { return true; } 1320}; 1321 1322/// LValueReferenceType - C++ [dcl.ref] - Lvalue reference 1323/// 1324class LValueReferenceType : public ReferenceType { 1325 LValueReferenceType(QualType Referencee, QualType CanonicalRef, 1326 bool SpelledAsLValue) : 1327 ReferenceType(LValueReference, Referencee, CanonicalRef, SpelledAsLValue) 1328 {} 1329 friend class ASTContext; // ASTContext creates these 1330public: 1331 bool isSugared() const { return false; } 1332 QualType desugar() const { return QualType(this, 0); } 1333 1334 static bool classof(const Type *T) { 1335 return T->getTypeClass() == LValueReference; 1336 } 1337 static bool classof(const LValueReferenceType *) { return true; } 1338}; 1339 1340/// RValueReferenceType - C++0x [dcl.ref] - Rvalue reference 1341/// 1342class RValueReferenceType : public ReferenceType { 1343 RValueReferenceType(QualType Referencee, QualType CanonicalRef) : 1344 ReferenceType(RValueReference, Referencee, CanonicalRef, false) { 1345 } 1346 friend class ASTContext; // ASTContext creates these 1347public: 1348 bool isSugared() const { return false; } 1349 QualType desugar() const { return QualType(this, 0); } 1350 1351 static bool classof(const Type *T) { 1352 return T->getTypeClass() == RValueReference; 1353 } 1354 static bool classof(const RValueReferenceType *) { return true; } 1355}; 1356 1357/// MemberPointerType - C++ 8.3.3 - Pointers to members 1358/// 1359class MemberPointerType : public Type, public llvm::FoldingSetNode { 1360 QualType PointeeType; 1361 /// The class of which the pointee is a member. Must ultimately be a 1362 /// RecordType, but could be a typedef or a template parameter too. 1363 const Type *Class; 1364 1365 MemberPointerType(QualType Pointee, const Type *Cls, QualType CanonicalPtr) : 1366 Type(MemberPointer, CanonicalPtr, 1367 Cls->isDependentType() || Pointee->isDependentType()), 1368 PointeeType(Pointee), Class(Cls) { 1369 } 1370 friend class ASTContext; // ASTContext creates these. 1371 1372protected: 1373 virtual Linkage getLinkageImpl() const; 1374 1375public: 1376 QualType getPointeeType() const { return PointeeType; } 1377 1378 /// Returns true if the member type (i.e. the pointee type) is a 1379 /// function type rather than a data-member type. 1380 bool isMemberFunctionPointer() const { 1381 return PointeeType->isFunctionProtoType(); 1382 } 1383 1384 /// Returns true if the member type (i.e. the pointee type) is a 1385 /// data type rather than a function type. 1386 bool isMemberDataPointer() const { 1387 return !PointeeType->isFunctionProtoType(); 1388 } 1389 1390 const Type *getClass() const { return Class; } 1391 1392 bool isSugared() const { return false; } 1393 QualType desugar() const { return QualType(this, 0); } 1394 1395 void Profile(llvm::FoldingSetNodeID &ID) { 1396 Profile(ID, getPointeeType(), getClass()); 1397 } 1398 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee, 1399 const Type *Class) { 1400 ID.AddPointer(Pointee.getAsOpaquePtr()); 1401 ID.AddPointer(Class); 1402 } 1403 1404 static bool classof(const Type *T) { 1405 return T->getTypeClass() == MemberPointer; 1406 } 1407 static bool classof(const MemberPointerType *) { return true; } 1408}; 1409 1410/// ArrayType - C99 6.7.5.2 - Array Declarators. 1411/// 1412class ArrayType : public Type, public llvm::FoldingSetNode { 1413public: 1414 /// ArraySizeModifier - Capture whether this is a normal array (e.g. int X[4]) 1415 /// an array with a static size (e.g. int X[static 4]), or an array 1416 /// with a star size (e.g. int X[*]). 1417 /// 'static' is only allowed on function parameters. 1418 enum ArraySizeModifier { 1419 Normal, Static, Star 1420 }; 1421private: 1422 /// ElementType - The element type of the array. 1423 QualType ElementType; 1424 1425 // NOTE: VC++ treats enums as signed, avoid using the ArraySizeModifier enum 1426 /// NOTE: These fields are packed into the bitfields space in the Type class. 1427 unsigned SizeModifier : 2; 1428 1429 /// IndexTypeQuals - Capture qualifiers in declarations like: 1430 /// 'int X[static restrict 4]'. For function parameters only. 1431 unsigned IndexTypeQuals : 3; 1432 1433protected: 1434 // C++ [temp.dep.type]p1: 1435 // A type is dependent if it is... 1436 // - an array type constructed from any dependent type or whose 1437 // size is specified by a constant expression that is 1438 // value-dependent, 1439 ArrayType(TypeClass tc, QualType et, QualType can, 1440 ArraySizeModifier sm, unsigned tq) 1441 : Type(tc, can, et->isDependentType() || tc == DependentSizedArray), 1442 ElementType(et), SizeModifier(sm), IndexTypeQuals(tq) {} 1443 1444 friend class ASTContext; // ASTContext creates these. 1445 1446 virtual Linkage getLinkageImpl() const; 1447 1448public: 1449 QualType getElementType() const { return ElementType; } 1450 ArraySizeModifier getSizeModifier() const { 1451 return ArraySizeModifier(SizeModifier); 1452 } 1453 Qualifiers getIndexTypeQualifiers() const { 1454 return Qualifiers::fromCVRMask(IndexTypeQuals); 1455 } 1456 unsigned getIndexTypeCVRQualifiers() const { return IndexTypeQuals; } 1457 1458 static bool classof(const Type *T) { 1459 return T->getTypeClass() == ConstantArray || 1460 T->getTypeClass() == VariableArray || 1461 T->getTypeClass() == IncompleteArray || 1462 T->getTypeClass() == DependentSizedArray; 1463 } 1464 static bool classof(const ArrayType *) { return true; } 1465}; 1466 1467/// ConstantArrayType - This class represents the canonical version of 1468/// C arrays with a specified constant size. For example, the canonical 1469/// type for 'int A[4 + 4*100]' is a ConstantArrayType where the element 1470/// type is 'int' and the size is 404. 1471class ConstantArrayType : public ArrayType { 1472 llvm::APInt Size; // Allows us to unique the type. 1473 1474 ConstantArrayType(QualType et, QualType can, const llvm::APInt &size, 1475 ArraySizeModifier sm, unsigned tq) 1476 : ArrayType(ConstantArray, et, can, sm, tq), 1477 Size(size) {} 1478protected: 1479 ConstantArrayType(TypeClass tc, QualType et, QualType can, 1480 const llvm::APInt &size, ArraySizeModifier sm, unsigned tq) 1481 : ArrayType(tc, et, can, sm, tq), Size(size) {} 1482 friend class ASTContext; // ASTContext creates these. 1483public: 1484 const llvm::APInt &getSize() const { return Size; } 1485 bool isSugared() const { return false; } 1486 QualType desugar() const { return QualType(this, 0); } 1487 1488 1489 /// \brief Determine the number of bits required to address a member of 1490 // an array with the given element type and number of elements. 1491 static unsigned getNumAddressingBits(ASTContext &Context, 1492 QualType ElementType, 1493 const llvm::APInt &NumElements); 1494 1495 /// \brief Determine the maximum number of active bits that an array's size 1496 /// can require, which limits the maximum size of the array. 1497 static unsigned getMaxSizeBits(ASTContext &Context); 1498 1499 void Profile(llvm::FoldingSetNodeID &ID) { 1500 Profile(ID, getElementType(), getSize(), 1501 getSizeModifier(), getIndexTypeCVRQualifiers()); 1502 } 1503 static void Profile(llvm::FoldingSetNodeID &ID, QualType ET, 1504 const llvm::APInt &ArraySize, ArraySizeModifier SizeMod, 1505 unsigned TypeQuals) { 1506 ID.AddPointer(ET.getAsOpaquePtr()); 1507 ID.AddInteger(ArraySize.getZExtValue()); 1508 ID.AddInteger(SizeMod); 1509 ID.AddInteger(TypeQuals); 1510 } 1511 static bool classof(const Type *T) { 1512 return T->getTypeClass() == ConstantArray; 1513 } 1514 static bool classof(const ConstantArrayType *) { return true; } 1515}; 1516 1517/// IncompleteArrayType - This class represents C arrays with an unspecified 1518/// size. For example 'int A[]' has an IncompleteArrayType where the element 1519/// type is 'int' and the size is unspecified. 1520class IncompleteArrayType : public ArrayType { 1521 1522 IncompleteArrayType(QualType et, QualType can, 1523 ArraySizeModifier sm, unsigned tq) 1524 : ArrayType(IncompleteArray, et, can, sm, tq) {} 1525 friend class ASTContext; // ASTContext creates these. 1526public: 1527 bool isSugared() const { return false; } 1528 QualType desugar() const { return QualType(this, 0); } 1529 1530 static bool classof(const Type *T) { 1531 return T->getTypeClass() == IncompleteArray; 1532 } 1533 static bool classof(const IncompleteArrayType *) { return true; } 1534 1535 friend class StmtIteratorBase; 1536 1537 void Profile(llvm::FoldingSetNodeID &ID) { 1538 Profile(ID, getElementType(), getSizeModifier(), 1539 getIndexTypeCVRQualifiers()); 1540 } 1541 1542 static void Profile(llvm::FoldingSetNodeID &ID, QualType ET, 1543 ArraySizeModifier SizeMod, unsigned TypeQuals) { 1544 ID.AddPointer(ET.getAsOpaquePtr()); 1545 ID.AddInteger(SizeMod); 1546 ID.AddInteger(TypeQuals); 1547 } 1548}; 1549 1550/// VariableArrayType - This class represents C arrays with a specified size 1551/// which is not an integer-constant-expression. For example, 'int s[x+foo()]'. 1552/// Since the size expression is an arbitrary expression, we store it as such. 1553/// 1554/// Note: VariableArrayType's aren't uniqued (since the expressions aren't) and 1555/// should not be: two lexically equivalent variable array types could mean 1556/// different things, for example, these variables do not have the same type 1557/// dynamically: 1558/// 1559/// void foo(int x) { 1560/// int Y[x]; 1561/// ++x; 1562/// int Z[x]; 1563/// } 1564/// 1565class VariableArrayType : public ArrayType { 1566 /// SizeExpr - An assignment expression. VLA's are only permitted within 1567 /// a function block. 1568 Stmt *SizeExpr; 1569 /// Brackets - The left and right array brackets. 1570 SourceRange Brackets; 1571 1572 VariableArrayType(QualType et, QualType can, Expr *e, 1573 ArraySizeModifier sm, unsigned tq, 1574 SourceRange brackets) 1575 : ArrayType(VariableArray, et, can, sm, tq), 1576 SizeExpr((Stmt*) e), Brackets(brackets) {} 1577 friend class ASTContext; // ASTContext creates these. 1578 1579public: 1580 Expr *getSizeExpr() const { 1581 // We use C-style casts instead of cast<> here because we do not wish 1582 // to have a dependency of Type.h on Stmt.h/Expr.h. 1583 return (Expr*) SizeExpr; 1584 } 1585 SourceRange getBracketsRange() const { return Brackets; } 1586 SourceLocation getLBracketLoc() const { return Brackets.getBegin(); } 1587 SourceLocation getRBracketLoc() const { return Brackets.getEnd(); } 1588 1589 bool isSugared() const { return false; } 1590 QualType desugar() const { return QualType(this, 0); } 1591 1592 static bool classof(const Type *T) { 1593 return T->getTypeClass() == VariableArray; 1594 } 1595 static bool classof(const VariableArrayType *) { return true; } 1596 1597 friend class StmtIteratorBase; 1598 1599 void Profile(llvm::FoldingSetNodeID &ID) { 1600 assert(0 && "Cannnot unique VariableArrayTypes."); 1601 } 1602}; 1603 1604/// DependentSizedArrayType - This type represents an array type in 1605/// C++ whose size is a value-dependent expression. For example: 1606/// 1607/// \code 1608/// template<typename T, int Size> 1609/// class array { 1610/// T data[Size]; 1611/// }; 1612/// \endcode 1613/// 1614/// For these types, we won't actually know what the array bound is 1615/// until template instantiation occurs, at which point this will 1616/// become either a ConstantArrayType or a VariableArrayType. 1617class DependentSizedArrayType : public ArrayType { 1618 ASTContext &Context; 1619 1620 /// \brief An assignment expression that will instantiate to the 1621 /// size of the array. 1622 /// 1623 /// The expression itself might be NULL, in which case the array 1624 /// type will have its size deduced from an initializer. 1625 Stmt *SizeExpr; 1626 1627 /// Brackets - The left and right array brackets. 1628 SourceRange Brackets; 1629 1630 DependentSizedArrayType(ASTContext &Context, QualType et, QualType can, 1631 Expr *e, ArraySizeModifier sm, unsigned tq, 1632 SourceRange brackets) 1633 : ArrayType(DependentSizedArray, et, can, sm, tq), 1634 Context(Context), SizeExpr((Stmt*) e), Brackets(brackets) {} 1635 friend class ASTContext; // ASTContext creates these. 1636 1637public: 1638 Expr *getSizeExpr() const { 1639 // We use C-style casts instead of cast<> here because we do not wish 1640 // to have a dependency of Type.h on Stmt.h/Expr.h. 1641 return (Expr*) SizeExpr; 1642 } 1643 SourceRange getBracketsRange() const { return Brackets; } 1644 SourceLocation getLBracketLoc() const { return Brackets.getBegin(); } 1645 SourceLocation getRBracketLoc() const { return Brackets.getEnd(); } 1646 1647 bool isSugared() const { return false; } 1648 QualType desugar() const { return QualType(this, 0); } 1649 1650 static bool classof(const Type *T) { 1651 return T->getTypeClass() == DependentSizedArray; 1652 } 1653 static bool classof(const DependentSizedArrayType *) { return true; } 1654 1655 friend class StmtIteratorBase; 1656 1657 1658 void Profile(llvm::FoldingSetNodeID &ID) { 1659 Profile(ID, Context, getElementType(), 1660 getSizeModifier(), getIndexTypeCVRQualifiers(), getSizeExpr()); 1661 } 1662 1663 static void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context, 1664 QualType ET, ArraySizeModifier SizeMod, 1665 unsigned TypeQuals, Expr *E); 1666}; 1667 1668/// DependentSizedExtVectorType - This type represent an extended vector type 1669/// where either the type or size is dependent. For example: 1670/// @code 1671/// template<typename T, int Size> 1672/// class vector { 1673/// typedef T __attribute__((ext_vector_type(Size))) type; 1674/// } 1675/// @endcode 1676class DependentSizedExtVectorType : public Type, public llvm::FoldingSetNode { 1677 ASTContext &Context; 1678 Expr *SizeExpr; 1679 /// ElementType - The element type of the array. 1680 QualType ElementType; 1681 SourceLocation loc; 1682 1683 DependentSizedExtVectorType(ASTContext &Context, QualType ElementType, 1684 QualType can, Expr *SizeExpr, SourceLocation loc) 1685 : Type (DependentSizedExtVector, can, true), 1686 Context(Context), SizeExpr(SizeExpr), ElementType(ElementType), 1687 loc(loc) {} 1688 friend class ASTContext; 1689 1690public: 1691 Expr *getSizeExpr() const { return SizeExpr; } 1692 QualType getElementType() const { return ElementType; } 1693 SourceLocation getAttributeLoc() const { return loc; } 1694 1695 bool isSugared() const { return false; } 1696 QualType desugar() const { return QualType(this, 0); } 1697 1698 static bool classof(const Type *T) { 1699 return T->getTypeClass() == DependentSizedExtVector; 1700 } 1701 static bool classof(const DependentSizedExtVectorType *) { return true; } 1702 1703 void Profile(llvm::FoldingSetNodeID &ID) { 1704 Profile(ID, Context, getElementType(), getSizeExpr()); 1705 } 1706 1707 static void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context, 1708 QualType ElementType, Expr *SizeExpr); 1709}; 1710 1711 1712/// VectorType - GCC generic vector type. This type is created using 1713/// __attribute__((vector_size(n)), where "n" specifies the vector size in 1714/// bytes; or from an Altivec __vector or vector declaration. 1715/// Since the constructor takes the number of vector elements, the 1716/// client is responsible for converting the size into the number of elements. 1717class VectorType : public Type, public llvm::FoldingSetNode { 1718public: 1719 enum AltiVecSpecific { 1720 NotAltiVec, // is not AltiVec vector 1721 AltiVec, // is AltiVec vector 1722 Pixel, // is AltiVec 'vector Pixel' 1723 Bool // is AltiVec 'vector bool ...' 1724 }; 1725protected: 1726 /// ElementType - The element type of the vector. 1727 QualType ElementType; 1728 1729 /// NumElements - The number of elements in the vector. 1730 unsigned NumElements; 1731 1732 AltiVecSpecific AltiVecSpec; 1733 1734 VectorType(QualType vecType, unsigned nElements, QualType canonType, 1735 AltiVecSpecific altiVecSpec) : 1736 Type(Vector, canonType, vecType->isDependentType()), 1737 ElementType(vecType), NumElements(nElements), AltiVecSpec(altiVecSpec) {} 1738 VectorType(TypeClass tc, QualType vecType, unsigned nElements, 1739 QualType canonType, AltiVecSpecific altiVecSpec) 1740 : Type(tc, canonType, vecType->isDependentType()), ElementType(vecType), 1741 NumElements(nElements), AltiVecSpec(altiVecSpec) {} 1742 friend class ASTContext; // ASTContext creates these. 1743 1744 virtual Linkage getLinkageImpl() const; 1745 1746public: 1747 1748 QualType getElementType() const { return ElementType; } 1749 unsigned getNumElements() const { return NumElements; } 1750 1751 bool isSugared() const { return false; } 1752 QualType desugar() const { return QualType(this, 0); } 1753 1754 AltiVecSpecific getAltiVecSpecific() const { return AltiVecSpec; } 1755 1756 void Profile(llvm::FoldingSetNodeID &ID) { 1757 Profile(ID, getElementType(), getNumElements(), getTypeClass(), AltiVecSpec); 1758 } 1759 static void Profile(llvm::FoldingSetNodeID &ID, QualType ElementType, 1760 unsigned NumElements, TypeClass TypeClass, 1761 unsigned AltiVecSpec) { 1762 ID.AddPointer(ElementType.getAsOpaquePtr()); 1763 ID.AddInteger(NumElements); 1764 ID.AddInteger(TypeClass); 1765 ID.AddInteger(AltiVecSpec); 1766 } 1767 1768 static bool classof(const Type *T) { 1769 return T->getTypeClass() == Vector || T->getTypeClass() == ExtVector; 1770 } 1771 static bool classof(const VectorType *) { return true; } 1772}; 1773 1774/// ExtVectorType - Extended vector type. This type is created using 1775/// __attribute__((ext_vector_type(n)), where "n" is the number of elements. 1776/// Unlike vector_size, ext_vector_type is only allowed on typedef's. This 1777/// class enables syntactic extensions, like Vector Components for accessing 1778/// points, colors, and textures (modeled after OpenGL Shading Language). 1779class ExtVectorType : public VectorType { 1780 ExtVectorType(QualType vecType, unsigned nElements, QualType canonType) : 1781 VectorType(ExtVector, vecType, nElements, canonType, NotAltiVec) {} 1782 friend class ASTContext; // ASTContext creates these. 1783public: 1784 static int getPointAccessorIdx(char c) { 1785 switch (c) { 1786 default: return -1; 1787 case 'x': return 0; 1788 case 'y': return 1; 1789 case 'z': return 2; 1790 case 'w': return 3; 1791 } 1792 } 1793 static int getNumericAccessorIdx(char c) { 1794 switch (c) { 1795 default: return -1; 1796 case '0': return 0; 1797 case '1': return 1; 1798 case '2': return 2; 1799 case '3': return 3; 1800 case '4': return 4; 1801 case '5': return 5; 1802 case '6': return 6; 1803 case '7': return 7; 1804 case '8': return 8; 1805 case '9': return 9; 1806 case 'A': 1807 case 'a': return 10; 1808 case 'B': 1809 case 'b': return 11; 1810 case 'C': 1811 case 'c': return 12; 1812 case 'D': 1813 case 'd': return 13; 1814 case 'E': 1815 case 'e': return 14; 1816 case 'F': 1817 case 'f': return 15; 1818 } 1819 } 1820 1821 static int getAccessorIdx(char c) { 1822 if (int idx = getPointAccessorIdx(c)+1) return idx-1; 1823 return getNumericAccessorIdx(c); 1824 } 1825 1826 bool isAccessorWithinNumElements(char c) const { 1827 if (int idx = getAccessorIdx(c)+1) 1828 return unsigned(idx-1) < NumElements; 1829 return false; 1830 } 1831 bool isSugared() const { return false; } 1832 QualType desugar() const { return QualType(this, 0); } 1833 1834 static bool classof(const Type *T) { 1835 return T->getTypeClass() == ExtVector; 1836 } 1837 static bool classof(const ExtVectorType *) { return true; } 1838}; 1839 1840/// FunctionType - C99 6.7.5.3 - Function Declarators. This is the common base 1841/// class of FunctionNoProtoType and FunctionProtoType. 1842/// 1843class FunctionType : public Type { 1844 virtual void ANCHOR(); // Key function for FunctionType. 1845 1846 /// SubClassData - This field is owned by the subclass, put here to pack 1847 /// tightly with the ivars in Type. 1848 bool SubClassData : 1; 1849 1850 /// TypeQuals - Used only by FunctionProtoType, put here to pack with the 1851 /// other bitfields. 1852 /// The qualifiers are part of FunctionProtoType because... 1853 /// 1854 /// C++ 8.3.5p4: The return type, the parameter type list and the 1855 /// cv-qualifier-seq, [...], are part of the function type. 1856 /// 1857 unsigned TypeQuals : 3; 1858 1859 /// NoReturn - Indicates if the function type is attribute noreturn. 1860 unsigned NoReturn : 1; 1861 1862 /// RegParm - How many arguments to pass inreg. 1863 unsigned RegParm : 3; 1864 1865 /// CallConv - The calling convention used by the function. 1866 unsigned CallConv : 3; 1867 1868 // The type returned by the function. 1869 QualType ResultType; 1870 1871 public: 1872 // This class is used for passing arround the information needed to 1873 // construct a call. It is not actually used for storage, just for 1874 // factoring together common arguments. 1875 // If you add a field (say Foo), other than the obvious places (both, constructors, 1876 // compile failures), what you need to update is 1877 // * Operetor== 1878 // * getFoo 1879 // * withFoo 1880 // * functionType. Add Foo, getFoo. 1881 // * ASTContext::getFooType 1882 // * ASTContext::mergeFunctionTypes 1883 // * FunctionNoProtoType::Profile 1884 // * FunctionProtoType::Profile 1885 // * TypePrinter::PrintFunctionProto 1886 // * AST read and write 1887 // * Codegen 1888 1889 class ExtInfo { 1890 public: 1891 // Constructor with no defaults. Use this when you know that you 1892 // have all the elements (when reading an AST file for example). 1893 ExtInfo(bool noReturn, unsigned regParm, CallingConv cc) : 1894 NoReturn(noReturn), RegParm(regParm), CC(cc) {} 1895 1896 // Constructor with all defaults. Use when for example creating a 1897 // function know to use defaults. 1898 ExtInfo() : NoReturn(false), RegParm(0), CC(CC_Default) {} 1899 1900 bool getNoReturn() const { return NoReturn; } 1901 unsigned getRegParm() const { return RegParm; } 1902 CallingConv getCC() const { return CC; } 1903 1904 bool operator==(const ExtInfo &Other) const { 1905 return getNoReturn() == Other.getNoReturn() && 1906 getRegParm() == Other.getRegParm() && 1907 getCC() == Other.getCC(); 1908 } 1909 bool operator!=(const ExtInfo &Other) const { 1910 return !(*this == Other); 1911 } 1912 1913 // Note that we don't have setters. That is by design, use 1914 // the following with methods instead of mutating these objects. 1915 1916 ExtInfo withNoReturn(bool noReturn) const { 1917 return ExtInfo(noReturn, getRegParm(), getCC()); 1918 } 1919 1920 ExtInfo withRegParm(unsigned RegParm) const { 1921 return ExtInfo(getNoReturn(), RegParm, getCC()); 1922 } 1923 1924 ExtInfo withCallingConv(CallingConv cc) const { 1925 return ExtInfo(getNoReturn(), getRegParm(), cc); 1926 } 1927 1928 private: 1929 // True if we have __attribute__((noreturn)) 1930 bool NoReturn; 1931 // The value passed to __attribute__((regparm(x))) 1932 unsigned RegParm; 1933 // The calling convention as specified via 1934 // __attribute__((cdecl|stdcall|fastcall|thiscall|pascal)) 1935 CallingConv CC; 1936 }; 1937 1938protected: 1939 FunctionType(TypeClass tc, QualType res, bool SubclassInfo, 1940 unsigned typeQuals, QualType Canonical, bool Dependent, 1941 const ExtInfo &Info) 1942 : Type(tc, Canonical, Dependent), 1943 SubClassData(SubclassInfo), TypeQuals(typeQuals), 1944 NoReturn(Info.getNoReturn()), 1945 RegParm(Info.getRegParm()), CallConv(Info.getCC()), ResultType(res) {} 1946 bool getSubClassData() const { return SubClassData; } 1947 unsigned getTypeQuals() const { return TypeQuals; } 1948public: 1949 1950 QualType getResultType() const { return ResultType; } 1951 1952 unsigned getRegParmType() const { return RegParm; } 1953 bool getNoReturnAttr() const { return NoReturn; } 1954 CallingConv getCallConv() const { return (CallingConv)CallConv; } 1955 ExtInfo getExtInfo() const { 1956 return ExtInfo(NoReturn, RegParm, (CallingConv)CallConv); 1957 } 1958 1959 /// \brief Determine the type of an expression that calls a function of 1960 /// this type. 1961 QualType getCallResultType(ASTContext &Context) const { 1962 return getResultType().getNonLValueExprType(Context); 1963 } 1964 1965 static llvm::StringRef getNameForCallConv(CallingConv CC); 1966 1967 static bool classof(const Type *T) { 1968 return T->getTypeClass() == FunctionNoProto || 1969 T->getTypeClass() == FunctionProto; 1970 } 1971 static bool classof(const FunctionType *) { return true; } 1972}; 1973 1974/// FunctionNoProtoType - Represents a K&R-style 'int foo()' function, which has 1975/// no information available about its arguments. 1976class FunctionNoProtoType : public FunctionType, public llvm::FoldingSetNode { 1977 FunctionNoProtoType(QualType Result, QualType Canonical, 1978 const ExtInfo &Info) 1979 : FunctionType(FunctionNoProto, Result, false, 0, Canonical, 1980 /*Dependent=*/false, Info) {} 1981 friend class ASTContext; // ASTContext creates these. 1982 1983protected: 1984 virtual Linkage getLinkageImpl() const; 1985 1986public: 1987 // No additional state past what FunctionType provides. 1988 1989 bool isSugared() const { return false; } 1990 QualType desugar() const { return QualType(this, 0); } 1991 1992 void Profile(llvm::FoldingSetNodeID &ID) { 1993 Profile(ID, getResultType(), getExtInfo()); 1994 } 1995 static void Profile(llvm::FoldingSetNodeID &ID, QualType ResultType, 1996 const ExtInfo &Info) { 1997 ID.AddInteger(Info.getCC()); 1998 ID.AddInteger(Info.getRegParm()); 1999 ID.AddInteger(Info.getNoReturn()); 2000 ID.AddPointer(ResultType.getAsOpaquePtr()); 2001 } 2002 2003 static bool classof(const Type *T) { 2004 return T->getTypeClass() == FunctionNoProto; 2005 } 2006 static bool classof(const FunctionNoProtoType *) { return true; } 2007}; 2008 2009/// FunctionProtoType - Represents a prototype with argument type info, e.g. 2010/// 'int foo(int)' or 'int foo(void)'. 'void' is represented as having no 2011/// arguments, not as having a single void argument. Such a type can have an 2012/// exception specification, but this specification is not part of the canonical 2013/// type. 2014class FunctionProtoType : public FunctionType, public llvm::FoldingSetNode { 2015 /// hasAnyDependentType - Determine whether there are any dependent 2016 /// types within the arguments passed in. 2017 static bool hasAnyDependentType(const QualType *ArgArray, unsigned numArgs) { 2018 for (unsigned Idx = 0; Idx < numArgs; ++Idx) 2019 if (ArgArray[Idx]->isDependentType()) 2020 return true; 2021 2022 return false; 2023 } 2024 2025 FunctionProtoType(QualType Result, const QualType *ArgArray, unsigned numArgs, 2026 bool isVariadic, unsigned typeQuals, bool hasExs, 2027 bool hasAnyExs, const QualType *ExArray, 2028 unsigned numExs, QualType Canonical, 2029 const ExtInfo &Info) 2030 : FunctionType(FunctionProto, Result, isVariadic, typeQuals, Canonical, 2031 (Result->isDependentType() || 2032 hasAnyDependentType(ArgArray, numArgs)), 2033 Info), 2034 NumArgs(numArgs), NumExceptions(numExs), HasExceptionSpec(hasExs), 2035 AnyExceptionSpec(hasAnyExs) { 2036 // Fill in the trailing argument array. 2037 QualType *ArgInfo = reinterpret_cast<QualType*>(this+1); 2038 for (unsigned i = 0; i != numArgs; ++i) 2039 ArgInfo[i] = ArgArray[i]; 2040 // Fill in the exception array. 2041 QualType *Ex = ArgInfo + numArgs; 2042 for (unsigned i = 0; i != numExs; ++i) 2043 Ex[i] = ExArray[i]; 2044 } 2045 2046 /// NumArgs - The number of arguments this function has, not counting '...'. 2047 unsigned NumArgs : 20; 2048 2049 /// NumExceptions - The number of types in the exception spec, if any. 2050 unsigned NumExceptions : 10; 2051 2052 /// HasExceptionSpec - Whether this function has an exception spec at all. 2053 bool HasExceptionSpec : 1; 2054 2055 /// AnyExceptionSpec - Whether this function has a throw(...) spec. 2056 bool AnyExceptionSpec : 1; 2057 2058 /// ArgInfo - There is an variable size array after the class in memory that 2059 /// holds the argument types. 2060 2061 /// Exceptions - There is another variable size array after ArgInfo that 2062 /// holds the exception types. 2063 2064 friend class ASTContext; // ASTContext creates these. 2065 2066protected: 2067 virtual Linkage getLinkageImpl() const; 2068 2069public: 2070 unsigned getNumArgs() const { return NumArgs; } 2071 QualType getArgType(unsigned i) const { 2072 assert(i < NumArgs && "Invalid argument number!"); 2073 return arg_type_begin()[i]; 2074 } 2075 2076 bool hasExceptionSpec() const { return HasExceptionSpec; } 2077 bool hasAnyExceptionSpec() const { return AnyExceptionSpec; } 2078 unsigned getNumExceptions() const { return NumExceptions; } 2079 QualType getExceptionType(unsigned i) const { 2080 assert(i < NumExceptions && "Invalid exception number!"); 2081 return exception_begin()[i]; 2082 } 2083 bool hasEmptyExceptionSpec() const { 2084 return hasExceptionSpec() && !hasAnyExceptionSpec() && 2085 getNumExceptions() == 0; 2086 } 2087 2088 bool isVariadic() const { return getSubClassData(); } 2089 unsigned getTypeQuals() const { return FunctionType::getTypeQuals(); } 2090 2091 typedef const QualType *arg_type_iterator; 2092 arg_type_iterator arg_type_begin() const { 2093 return reinterpret_cast<const QualType *>(this+1); 2094 } 2095 arg_type_iterator arg_type_end() const { return arg_type_begin()+NumArgs; } 2096 2097 typedef const QualType *exception_iterator; 2098 exception_iterator exception_begin() const { 2099 // exceptions begin where arguments end 2100 return arg_type_end(); 2101 } 2102 exception_iterator exception_end() const { 2103 return exception_begin() + NumExceptions; 2104 } 2105 2106 bool isSugared() const { return false; } 2107 QualType desugar() const { return QualType(this, 0); } 2108 2109 static bool classof(const Type *T) { 2110 return T->getTypeClass() == FunctionProto; 2111 } 2112 static bool classof(const FunctionProtoType *) { return true; } 2113 2114 void Profile(llvm::FoldingSetNodeID &ID); 2115 static void Profile(llvm::FoldingSetNodeID &ID, QualType Result, 2116 arg_type_iterator ArgTys, unsigned NumArgs, 2117 bool isVariadic, unsigned TypeQuals, 2118 bool hasExceptionSpec, bool anyExceptionSpec, 2119 unsigned NumExceptions, exception_iterator Exs, 2120 const ExtInfo &ExtInfo); 2121}; 2122 2123 2124/// \brief Represents the dependent type named by a dependently-scoped 2125/// typename using declaration, e.g. 2126/// using typename Base<T>::foo; 2127/// Template instantiation turns these into the underlying type. 2128class UnresolvedUsingType : public Type { 2129 UnresolvedUsingTypenameDecl *Decl; 2130 2131 UnresolvedUsingType(const UnresolvedUsingTypenameDecl *D) 2132 : Type(UnresolvedUsing, QualType(), true), 2133 Decl(const_cast<UnresolvedUsingTypenameDecl*>(D)) {} 2134 friend class ASTContext; // ASTContext creates these. 2135public: 2136 2137 UnresolvedUsingTypenameDecl *getDecl() const { return Decl; } 2138 2139 bool isSugared() const { return false; } 2140 QualType desugar() const { return QualType(this, 0); } 2141 2142 static bool classof(const Type *T) { 2143 return T->getTypeClass() == UnresolvedUsing; 2144 } 2145 static bool classof(const UnresolvedUsingType *) { return true; } 2146 2147 void Profile(llvm::FoldingSetNodeID &ID) { 2148 return Profile(ID, Decl); 2149 } 2150 static void Profile(llvm::FoldingSetNodeID &ID, 2151 UnresolvedUsingTypenameDecl *D) { 2152 ID.AddPointer(D); 2153 } 2154}; 2155 2156 2157class TypedefType : public Type { 2158 TypedefDecl *Decl; 2159protected: 2160 TypedefType(TypeClass tc, const TypedefDecl *D, QualType can) 2161 : Type(tc, can, can->isDependentType()), 2162 Decl(const_cast<TypedefDecl*>(D)) { 2163 assert(!isa<TypedefType>(can) && "Invalid canonical type"); 2164 } 2165 friend class ASTContext; // ASTContext creates these. 2166public: 2167 2168 TypedefDecl *getDecl() const { return Decl; } 2169 2170 /// LookThroughTypedefs - Return the ultimate type this typedef corresponds to 2171 /// potentially looking through *all* consecutive typedefs. This returns the 2172 /// sum of the type qualifiers, so if you have: 2173 /// typedef const int A; 2174 /// typedef volatile A B; 2175 /// looking through the typedefs for B will give you "const volatile A". 2176 QualType LookThroughTypedefs() const; 2177 2178 bool isSugared() const { return true; } 2179 QualType desugar() const; 2180 2181 static bool classof(const Type *T) { return T->getTypeClass() == Typedef; } 2182 static bool classof(const TypedefType *) { return true; } 2183}; 2184 2185/// TypeOfExprType (GCC extension). 2186class TypeOfExprType : public Type { 2187 Expr *TOExpr; 2188 2189protected: 2190 TypeOfExprType(Expr *E, QualType can = QualType()); 2191 friend class ASTContext; // ASTContext creates these. 2192public: 2193 Expr *getUnderlyingExpr() const { return TOExpr; } 2194 2195 /// \brief Remove a single level of sugar. 2196 QualType desugar() const; 2197 2198 /// \brief Returns whether this type directly provides sugar. 2199 bool isSugared() const { return true; } 2200 2201 static bool classof(const Type *T) { return T->getTypeClass() == TypeOfExpr; } 2202 static bool classof(const TypeOfExprType *) { return true; } 2203}; 2204 2205/// \brief Internal representation of canonical, dependent 2206/// typeof(expr) types. 2207/// 2208/// This class is used internally by the ASTContext to manage 2209/// canonical, dependent types, only. Clients will only see instances 2210/// of this class via TypeOfExprType nodes. 2211class DependentTypeOfExprType 2212 : public TypeOfExprType, public llvm::FoldingSetNode { 2213 ASTContext &Context; 2214 2215public: 2216 DependentTypeOfExprType(ASTContext &Context, Expr *E) 2217 : TypeOfExprType(E), Context(Context) { } 2218 2219 bool isSugared() const { return false; } 2220 QualType desugar() const { return QualType(this, 0); } 2221 2222 void Profile(llvm::FoldingSetNodeID &ID) { 2223 Profile(ID, Context, getUnderlyingExpr()); 2224 } 2225 2226 static void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context, 2227 Expr *E); 2228}; 2229 2230/// TypeOfType (GCC extension). 2231class TypeOfType : public Type { 2232 QualType TOType; 2233 TypeOfType(QualType T, QualType can) 2234 : Type(TypeOf, can, T->isDependentType()), TOType(T) { 2235 assert(!isa<TypedefType>(can) && "Invalid canonical type"); 2236 } 2237 friend class ASTContext; // ASTContext creates these. 2238public: 2239 QualType getUnderlyingType() const { return TOType; } 2240 2241 /// \brief Remove a single level of sugar. 2242 QualType desugar() const { return getUnderlyingType(); } 2243 2244 /// \brief Returns whether this type directly provides sugar. 2245 bool isSugared() const { return true; } 2246 2247 static bool classof(const Type *T) { return T->getTypeClass() == TypeOf; } 2248 static bool classof(const TypeOfType *) { return true; } 2249}; 2250 2251/// DecltypeType (C++0x) 2252class DecltypeType : public Type { 2253 Expr *E; 2254 2255 // FIXME: We could get rid of UnderlyingType if we wanted to: We would have to 2256 // Move getDesugaredType to ASTContext so that it can call getDecltypeForExpr 2257 // from it. 2258 QualType UnderlyingType; 2259 2260protected: 2261 DecltypeType(Expr *E, QualType underlyingType, QualType can = QualType()); 2262 friend class ASTContext; // ASTContext creates these. 2263public: 2264 Expr *getUnderlyingExpr() const { return E; } 2265 QualType getUnderlyingType() const { return UnderlyingType; } 2266 2267 /// \brief Remove a single level of sugar. 2268 QualType desugar() const { return getUnderlyingType(); } 2269 2270 /// \brief Returns whether this type directly provides sugar. 2271 bool isSugared() const { return !isDependentType(); } 2272 2273 static bool classof(const Type *T) { return T->getTypeClass() == Decltype; } 2274 static bool classof(const DecltypeType *) { return true; } 2275}; 2276 2277/// \brief Internal representation of canonical, dependent 2278/// decltype(expr) types. 2279/// 2280/// This class is used internally by the ASTContext to manage 2281/// canonical, dependent types, only. Clients will only see instances 2282/// of this class via DecltypeType nodes. 2283class DependentDecltypeType : public DecltypeType, public llvm::FoldingSetNode { 2284 ASTContext &Context; 2285 2286public: 2287 DependentDecltypeType(ASTContext &Context, Expr *E); 2288 2289 bool isSugared() const { return false; } 2290 QualType desugar() const { return QualType(this, 0); } 2291 2292 void Profile(llvm::FoldingSetNodeID &ID) { 2293 Profile(ID, Context, getUnderlyingExpr()); 2294 } 2295 2296 static void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context, 2297 Expr *E); 2298}; 2299 2300class TagType : public Type { 2301 /// Stores the TagDecl associated with this type. The decl may point to any 2302 /// TagDecl that declares the entity. 2303 TagDecl * decl; 2304 2305protected: 2306 TagType(TypeClass TC, const TagDecl *D, QualType can); 2307 2308 virtual Linkage getLinkageImpl() const; 2309 2310public: 2311 TagDecl *getDecl() const; 2312 2313 /// @brief Determines whether this type is in the process of being 2314 /// defined. 2315 bool isBeingDefined() const; 2316 2317 static bool classof(const Type *T) { 2318 return T->getTypeClass() >= TagFirst && T->getTypeClass() <= TagLast; 2319 } 2320 static bool classof(const TagType *) { return true; } 2321 static bool classof(const RecordType *) { return true; } 2322 static bool classof(const EnumType *) { return true; } 2323}; 2324 2325/// RecordType - This is a helper class that allows the use of isa/cast/dyncast 2326/// to detect TagType objects of structs/unions/classes. 2327class RecordType : public TagType { 2328protected: 2329 explicit RecordType(const RecordDecl *D) 2330 : TagType(Record, reinterpret_cast<const TagDecl*>(D), QualType()) { } 2331 explicit RecordType(TypeClass TC, RecordDecl *D) 2332 : TagType(TC, reinterpret_cast<const TagDecl*>(D), QualType()) { } 2333 friend class ASTContext; // ASTContext creates these. 2334public: 2335 2336 RecordDecl *getDecl() const { 2337 return reinterpret_cast<RecordDecl*>(TagType::getDecl()); 2338 } 2339 2340 // FIXME: This predicate is a helper to QualType/Type. It needs to 2341 // recursively check all fields for const-ness. If any field is declared 2342 // const, it needs to return false. 2343 bool hasConstFields() const { return false; } 2344 2345 // FIXME: RecordType needs to check when it is created that all fields are in 2346 // the same address space, and return that. 2347 unsigned getAddressSpace() const { return 0; } 2348 2349 bool isSugared() const { return false; } 2350 QualType desugar() const { return QualType(this, 0); } 2351 2352 static bool classof(const TagType *T); 2353 static bool classof(const Type *T) { 2354 return isa<TagType>(T) && classof(cast<TagType>(T)); 2355 } 2356 static bool classof(const RecordType *) { return true; } 2357}; 2358 2359/// EnumType - This is a helper class that allows the use of isa/cast/dyncast 2360/// to detect TagType objects of enums. 2361class EnumType : public TagType { 2362 explicit EnumType(const EnumDecl *D) 2363 : TagType(Enum, reinterpret_cast<const TagDecl*>(D), QualType()) { } 2364 friend class ASTContext; // ASTContext creates these. 2365public: 2366 2367 EnumDecl *getDecl() const { 2368 return reinterpret_cast<EnumDecl*>(TagType::getDecl()); 2369 } 2370 2371 bool isSugared() const { return false; } 2372 QualType desugar() const { return QualType(this, 0); } 2373 2374 static bool classof(const TagType *T); 2375 static bool classof(const Type *T) { 2376 return isa<TagType>(T) && classof(cast<TagType>(T)); 2377 } 2378 static bool classof(const EnumType *) { return true; } 2379}; 2380 2381class TemplateTypeParmType : public Type, public llvm::FoldingSetNode { 2382 unsigned Depth : 15; 2383 unsigned Index : 16; 2384 unsigned ParameterPack : 1; 2385 IdentifierInfo *Name; 2386 2387 TemplateTypeParmType(unsigned D, unsigned I, bool PP, IdentifierInfo *N, 2388 QualType Canon) 2389 : Type(TemplateTypeParm, Canon, /*Dependent=*/true), 2390 Depth(D), Index(I), ParameterPack(PP), Name(N) { } 2391 2392 TemplateTypeParmType(unsigned D, unsigned I, bool PP) 2393 : Type(TemplateTypeParm, QualType(this, 0), /*Dependent=*/true), 2394 Depth(D), Index(I), ParameterPack(PP), Name(0) { } 2395 2396 friend class ASTContext; // ASTContext creates these 2397 2398public: 2399 unsigned getDepth() const { return Depth; } 2400 unsigned getIndex() const { return Index; } 2401 bool isParameterPack() const { return ParameterPack; } 2402 IdentifierInfo *getName() const { return Name; } 2403 2404 bool isSugared() const { return false; } 2405 QualType desugar() const { return QualType(this, 0); } 2406 2407 void Profile(llvm::FoldingSetNodeID &ID) { 2408 Profile(ID, Depth, Index, ParameterPack, Name); 2409 } 2410 2411 static void Profile(llvm::FoldingSetNodeID &ID, unsigned Depth, 2412 unsigned Index, bool ParameterPack, 2413 IdentifierInfo *Name) { 2414 ID.AddInteger(Depth); 2415 ID.AddInteger(Index); 2416 ID.AddBoolean(ParameterPack); 2417 ID.AddPointer(Name); 2418 } 2419 2420 static bool classof(const Type *T) { 2421 return T->getTypeClass() == TemplateTypeParm; 2422 } 2423 static bool classof(const TemplateTypeParmType *T) { return true; } 2424}; 2425 2426/// \brief Represents the result of substituting a type for a template 2427/// type parameter. 2428/// 2429/// Within an instantiated template, all template type parameters have 2430/// been replaced with these. They are used solely to record that a 2431/// type was originally written as a template type parameter; 2432/// therefore they are never canonical. 2433class SubstTemplateTypeParmType : public Type, public llvm::FoldingSetNode { 2434 // The original type parameter. 2435 const TemplateTypeParmType *Replaced; 2436 2437 SubstTemplateTypeParmType(const TemplateTypeParmType *Param, QualType Canon) 2438 : Type(SubstTemplateTypeParm, Canon, Canon->isDependentType()), 2439 Replaced(Param) { } 2440 2441 friend class ASTContext; 2442 2443public: 2444 IdentifierInfo *getName() const { return Replaced->getName(); } 2445 2446 /// Gets the template parameter that was substituted for. 2447 const TemplateTypeParmType *getReplacedParameter() const { 2448 return Replaced; 2449 } 2450 2451 /// Gets the type that was substituted for the template 2452 /// parameter. 2453 QualType getReplacementType() const { 2454 return getCanonicalTypeInternal(); 2455 } 2456 2457 bool isSugared() const { return true; } 2458 QualType desugar() const { return getReplacementType(); } 2459 2460 void Profile(llvm::FoldingSetNodeID &ID) { 2461 Profile(ID, getReplacedParameter(), getReplacementType()); 2462 } 2463 static void Profile(llvm::FoldingSetNodeID &ID, 2464 const TemplateTypeParmType *Replaced, 2465 QualType Replacement) { 2466 ID.AddPointer(Replaced); 2467 ID.AddPointer(Replacement.getAsOpaquePtr()); 2468 } 2469 2470 static bool classof(const Type *T) { 2471 return T->getTypeClass() == SubstTemplateTypeParm; 2472 } 2473 static bool classof(const SubstTemplateTypeParmType *T) { return true; } 2474}; 2475 2476/// \brief Represents the type of a template specialization as written 2477/// in the source code. 2478/// 2479/// Template specialization types represent the syntactic form of a 2480/// template-id that refers to a type, e.g., @c vector<int>. Some 2481/// template specialization types are syntactic sugar, whose canonical 2482/// type will point to some other type node that represents the 2483/// instantiation or class template specialization. For example, a 2484/// class template specialization type of @c vector<int> will refer to 2485/// a tag type for the instantiation 2486/// @c std::vector<int, std::allocator<int>>. 2487/// 2488/// Other template specialization types, for which the template name 2489/// is dependent, may be canonical types. These types are always 2490/// dependent. 2491class TemplateSpecializationType 2492 : public Type, public llvm::FoldingSetNode { 2493 /// \brief The name of the template being specialized. 2494 TemplateName Template; 2495 2496 /// \brief - The number of template arguments named in this class 2497 /// template specialization. 2498 unsigned NumArgs; 2499 2500 TemplateSpecializationType(TemplateName T, 2501 const TemplateArgument *Args, 2502 unsigned NumArgs, QualType Canon); 2503 2504 friend class ASTContext; // ASTContext creates these 2505 2506public: 2507 /// \brief Determine whether any of the given template arguments are 2508 /// dependent. 2509 static bool anyDependentTemplateArguments(const TemplateArgument *Args, 2510 unsigned NumArgs); 2511 2512 static bool anyDependentTemplateArguments(const TemplateArgumentLoc *Args, 2513 unsigned NumArgs); 2514 2515 static bool anyDependentTemplateArguments(const TemplateArgumentListInfo &); 2516 2517 /// \brief Print a template argument list, including the '<' and '>' 2518 /// enclosing the template arguments. 2519 static std::string PrintTemplateArgumentList(const TemplateArgument *Args, 2520 unsigned NumArgs, 2521 const PrintingPolicy &Policy); 2522 2523 static std::string PrintTemplateArgumentList(const TemplateArgumentLoc *Args, 2524 unsigned NumArgs, 2525 const PrintingPolicy &Policy); 2526 2527 static std::string PrintTemplateArgumentList(const TemplateArgumentListInfo &, 2528 const PrintingPolicy &Policy); 2529 2530 /// True if this template specialization type matches a current 2531 /// instantiation in the context in which it is found. 2532 bool isCurrentInstantiation() const { 2533 return isa<InjectedClassNameType>(getCanonicalTypeInternal()); 2534 } 2535 2536 typedef const TemplateArgument * iterator; 2537 2538 iterator begin() const { return getArgs(); } 2539 iterator end() const; // defined inline in TemplateBase.h 2540 2541 /// \brief Retrieve the name of the template that we are specializing. 2542 TemplateName getTemplateName() const { return Template; } 2543 2544 /// \brief Retrieve the template arguments. 2545 const TemplateArgument *getArgs() const { 2546 return reinterpret_cast<const TemplateArgument *>(this + 1); 2547 } 2548 2549 /// \brief Retrieve the number of template arguments. 2550 unsigned getNumArgs() const { return NumArgs; } 2551 2552 /// \brief Retrieve a specific template argument as a type. 2553 /// \precondition @c isArgType(Arg) 2554 const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h 2555 2556 bool isSugared() const { 2557 return !isDependentType() || isCurrentInstantiation(); 2558 } 2559 QualType desugar() const { return getCanonicalTypeInternal(); } 2560 2561 void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Ctx) { 2562 Profile(ID, Template, getArgs(), NumArgs, Ctx); 2563 } 2564 2565 static void Profile(llvm::FoldingSetNodeID &ID, TemplateName T, 2566 const TemplateArgument *Args, 2567 unsigned NumArgs, 2568 ASTContext &Context); 2569 2570 static bool classof(const Type *T) { 2571 return T->getTypeClass() == TemplateSpecialization; 2572 } 2573 static bool classof(const TemplateSpecializationType *T) { return true; } 2574}; 2575 2576/// \brief The injected class name of a C++ class template or class 2577/// template partial specialization. Used to record that a type was 2578/// spelled with a bare identifier rather than as a template-id; the 2579/// equivalent for non-templated classes is just RecordType. 2580/// 2581/// Injected class name types are always dependent. Template 2582/// instantiation turns these into RecordTypes. 2583/// 2584/// Injected class name types are always canonical. This works 2585/// because it is impossible to compare an injected class name type 2586/// with the corresponding non-injected template type, for the same 2587/// reason that it is impossible to directly compare template 2588/// parameters from different dependent contexts: injected class name 2589/// types can only occur within the scope of a particular templated 2590/// declaration, and within that scope every template specialization 2591/// will canonicalize to the injected class name (when appropriate 2592/// according to the rules of the language). 2593class InjectedClassNameType : public Type { 2594 CXXRecordDecl *Decl; 2595 2596 /// The template specialization which this type represents. 2597 /// For example, in 2598 /// template <class T> class A { ... }; 2599 /// this is A<T>, whereas in 2600 /// template <class X, class Y> class A<B<X,Y> > { ... }; 2601 /// this is A<B<X,Y> >. 2602 /// 2603 /// It is always unqualified, always a template specialization type, 2604 /// and always dependent. 2605 QualType InjectedType; 2606 2607 friend class ASTContext; // ASTContext creates these. 2608 friend class ASTReader; // FIXME: ASTContext::getInjectedClassNameType is not 2609 // currently suitable for AST reading, too much 2610 // interdependencies. 2611 InjectedClassNameType(CXXRecordDecl *D, QualType TST) 2612 : Type(InjectedClassName, QualType(), true), 2613 Decl(D), InjectedType(TST) { 2614 assert(isa<TemplateSpecializationType>(TST)); 2615 assert(!TST.hasQualifiers()); 2616 assert(TST->isDependentType()); 2617 } 2618 2619public: 2620 QualType getInjectedSpecializationType() const { return InjectedType; } 2621 const TemplateSpecializationType *getInjectedTST() const { 2622 return cast<TemplateSpecializationType>(InjectedType.getTypePtr()); 2623 } 2624 2625 CXXRecordDecl *getDecl() const; 2626 2627 bool isSugared() const { return false; } 2628 QualType desugar() const { return QualType(this, 0); } 2629 2630 static bool classof(const Type *T) { 2631 return T->getTypeClass() == InjectedClassName; 2632 } 2633 static bool classof(const InjectedClassNameType *T) { return true; } 2634}; 2635 2636/// \brief The kind of a tag type. 2637enum TagTypeKind { 2638 /// \brief The "struct" keyword. 2639 TTK_Struct, 2640 /// \brief The "union" keyword. 2641 TTK_Union, 2642 /// \brief The "class" keyword. 2643 TTK_Class, 2644 /// \brief The "enum" keyword. 2645 TTK_Enum 2646}; 2647 2648/// \brief The elaboration keyword that precedes a qualified type name or 2649/// introduces an elaborated-type-specifier. 2650enum ElaboratedTypeKeyword { 2651 /// \brief The "struct" keyword introduces the elaborated-type-specifier. 2652 ETK_Struct, 2653 /// \brief The "union" keyword introduces the elaborated-type-specifier. 2654 ETK_Union, 2655 /// \brief The "class" keyword introduces the elaborated-type-specifier. 2656 ETK_Class, 2657 /// \brief The "enum" keyword introduces the elaborated-type-specifier. 2658 ETK_Enum, 2659 /// \brief The "typename" keyword precedes the qualified type name, e.g., 2660 /// \c typename T::type. 2661 ETK_Typename, 2662 /// \brief No keyword precedes the qualified type name. 2663 ETK_None 2664}; 2665 2666/// A helper class for Type nodes having an ElaboratedTypeKeyword. 2667/// The keyword in stored in the free bits of the base class. 2668/// Also provides a few static helpers for converting and printing 2669/// elaborated type keyword and tag type kind enumerations. 2670class TypeWithKeyword : public Type { 2671 /// Keyword - Encodes an ElaboratedTypeKeyword enumeration constant. 2672 unsigned Keyword : 3; 2673 2674protected: 2675 TypeWithKeyword(ElaboratedTypeKeyword Keyword, TypeClass tc, 2676 QualType Canonical, bool dependent) 2677 : Type(tc, Canonical, dependent), Keyword(Keyword) {} 2678 2679public: 2680 virtual ~TypeWithKeyword(); // pin vtable to Type.cpp 2681 2682 ElaboratedTypeKeyword getKeyword() const { 2683 return static_cast<ElaboratedTypeKeyword>(Keyword); 2684 } 2685 2686 /// getKeywordForTypeSpec - Converts a type specifier (DeclSpec::TST) 2687 /// into an elaborated type keyword. 2688 static ElaboratedTypeKeyword getKeywordForTypeSpec(unsigned TypeSpec); 2689 2690 /// getTagTypeKindForTypeSpec - Converts a type specifier (DeclSpec::TST) 2691 /// into a tag type kind. It is an error to provide a type specifier 2692 /// which *isn't* a tag kind here. 2693 static TagTypeKind getTagTypeKindForTypeSpec(unsigned TypeSpec); 2694 2695 /// getKeywordForTagDeclKind - Converts a TagTypeKind into an 2696 /// elaborated type keyword. 2697 static ElaboratedTypeKeyword getKeywordForTagTypeKind(TagTypeKind Tag); 2698 2699 /// getTagTypeKindForKeyword - Converts an elaborated type keyword into 2700 // a TagTypeKind. It is an error to provide an elaborated type keyword 2701 /// which *isn't* a tag kind here. 2702 static TagTypeKind getTagTypeKindForKeyword(ElaboratedTypeKeyword Keyword); 2703 2704 static bool KeywordIsTagTypeKind(ElaboratedTypeKeyword Keyword); 2705 2706 static const char *getKeywordName(ElaboratedTypeKeyword Keyword); 2707 2708 static const char *getTagTypeKindName(TagTypeKind Kind) { 2709 return getKeywordName(getKeywordForTagTypeKind(Kind)); 2710 } 2711 2712 class CannotCastToThisType {}; 2713 static CannotCastToThisType classof(const Type *); 2714}; 2715 2716/// \brief Represents a type that was referred to using an elaborated type 2717/// keyword, e.g., struct S, or via a qualified name, e.g., N::M::type, 2718/// or both. 2719/// 2720/// This type is used to keep track of a type name as written in the 2721/// source code, including tag keywords and any nested-name-specifiers. 2722/// The type itself is always "sugar", used to express what was written 2723/// in the source code but containing no additional semantic information. 2724class ElaboratedType : public TypeWithKeyword, public llvm::FoldingSetNode { 2725 2726 /// \brief The nested name specifier containing the qualifier. 2727 NestedNameSpecifier *NNS; 2728 2729 /// \brief The type that this qualified name refers to. 2730 QualType NamedType; 2731 2732 ElaboratedType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS, 2733 QualType NamedType, QualType CanonType) 2734 : TypeWithKeyword(Keyword, Elaborated, CanonType, 2735 NamedType->isDependentType()), 2736 NNS(NNS), NamedType(NamedType) { 2737 assert(!(Keyword == ETK_None && NNS == 0) && 2738 "ElaboratedType cannot have elaborated type keyword " 2739 "and name qualifier both null."); 2740 } 2741 2742 friend class ASTContext; // ASTContext creates these 2743 2744public: 2745 ~ElaboratedType(); 2746 2747 /// \brief Retrieve the qualification on this type. 2748 NestedNameSpecifier *getQualifier() const { return NNS; } 2749 2750 /// \brief Retrieve the type named by the qualified-id. 2751 QualType getNamedType() const { return NamedType; } 2752 2753 /// \brief Remove a single level of sugar. 2754 QualType desugar() const { return getNamedType(); } 2755 2756 /// \brief Returns whether this type directly provides sugar. 2757 bool isSugared() const { return true; } 2758 2759 void Profile(llvm::FoldingSetNodeID &ID) { 2760 Profile(ID, getKeyword(), NNS, NamedType); 2761 } 2762 2763 static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword, 2764 NestedNameSpecifier *NNS, QualType NamedType) { 2765 ID.AddInteger(Keyword); 2766 ID.AddPointer(NNS); 2767 NamedType.Profile(ID); 2768 } 2769 2770 static bool classof(const Type *T) { 2771 return T->getTypeClass() == Elaborated; 2772 } 2773 static bool classof(const ElaboratedType *T) { return true; } 2774}; 2775 2776/// \brief Represents a qualified type name for which the type name is 2777/// dependent. 2778/// 2779/// DependentNameType represents a class of dependent types that involve a 2780/// dependent nested-name-specifier (e.g., "T::") followed by a (dependent) 2781/// name of a type. The DependentNameType may start with a "typename" (for a 2782/// typename-specifier), "class", "struct", "union", or "enum" (for a 2783/// dependent elaborated-type-specifier), or nothing (in contexts where we 2784/// know that we must be referring to a type, e.g., in a base class specifier). 2785class DependentNameType : public TypeWithKeyword, public llvm::FoldingSetNode { 2786 2787 /// \brief The nested name specifier containing the qualifier. 2788 NestedNameSpecifier *NNS; 2789 2790 /// \brief The type that this typename specifier refers to. 2791 const IdentifierInfo *Name; 2792 2793 DependentNameType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS, 2794 const IdentifierInfo *Name, QualType CanonType) 2795 : TypeWithKeyword(Keyword, DependentName, CanonType, true), 2796 NNS(NNS), Name(Name) { 2797 assert(NNS->isDependent() && 2798 "DependentNameType requires a dependent nested-name-specifier"); 2799 } 2800 2801 friend class ASTContext; // ASTContext creates these 2802 2803public: 2804 virtual ~DependentNameType(); 2805 2806 /// \brief Retrieve the qualification on this type. 2807 NestedNameSpecifier *getQualifier() const { return NNS; } 2808 2809 /// \brief Retrieve the type named by the typename specifier as an 2810 /// identifier. 2811 /// 2812 /// This routine will return a non-NULL identifier pointer when the 2813 /// form of the original typename was terminated by an identifier, 2814 /// e.g., "typename T::type". 2815 const IdentifierInfo *getIdentifier() const { 2816 return Name; 2817 } 2818 2819 bool isSugared() const { return false; } 2820 QualType desugar() const { return QualType(this, 0); } 2821 2822 void Profile(llvm::FoldingSetNodeID &ID) { 2823 Profile(ID, getKeyword(), NNS, Name); 2824 } 2825 2826 static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword, 2827 NestedNameSpecifier *NNS, const IdentifierInfo *Name) { 2828 ID.AddInteger(Keyword); 2829 ID.AddPointer(NNS); 2830 ID.AddPointer(Name); 2831 } 2832 2833 static bool classof(const Type *T) { 2834 return T->getTypeClass() == DependentName; 2835 } 2836 static bool classof(const DependentNameType *T) { return true; } 2837}; 2838 2839/// DependentTemplateSpecializationType - Represents a template 2840/// specialization type whose template cannot be resolved, e.g. 2841/// A<T>::template B<T> 2842class DependentTemplateSpecializationType : 2843 public TypeWithKeyword, public llvm::FoldingSetNode { 2844 2845 /// \brief The nested name specifier containing the qualifier. 2846 NestedNameSpecifier *NNS; 2847 2848 /// \brief The identifier of the template. 2849 const IdentifierInfo *Name; 2850 2851 /// \brief - The number of template arguments named in this class 2852 /// template specialization. 2853 unsigned NumArgs; 2854 2855 const TemplateArgument *getArgBuffer() const { 2856 return reinterpret_cast<const TemplateArgument*>(this+1); 2857 } 2858 TemplateArgument *getArgBuffer() { 2859 return reinterpret_cast<TemplateArgument*>(this+1); 2860 } 2861 2862 DependentTemplateSpecializationType(ElaboratedTypeKeyword Keyword, 2863 NestedNameSpecifier *NNS, 2864 const IdentifierInfo *Name, 2865 unsigned NumArgs, 2866 const TemplateArgument *Args, 2867 QualType Canon); 2868 2869 friend class ASTContext; // ASTContext creates these 2870 2871public: 2872 virtual ~DependentTemplateSpecializationType(); 2873 2874 NestedNameSpecifier *getQualifier() const { return NNS; } 2875 const IdentifierInfo *getIdentifier() const { return Name; } 2876 2877 /// \brief Retrieve the template arguments. 2878 const TemplateArgument *getArgs() const { 2879 return getArgBuffer(); 2880 } 2881 2882 /// \brief Retrieve the number of template arguments. 2883 unsigned getNumArgs() const { return NumArgs; } 2884 2885 const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h 2886 2887 typedef const TemplateArgument * iterator; 2888 iterator begin() const { return getArgs(); } 2889 iterator end() const; // inline in TemplateBase.h 2890 2891 bool isSugared() const { return false; } 2892 QualType desugar() const { return QualType(this, 0); } 2893 2894 void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context) { 2895 Profile(ID, Context, getKeyword(), NNS, Name, NumArgs, getArgs()); 2896 } 2897 2898 static void Profile(llvm::FoldingSetNodeID &ID, 2899 ASTContext &Context, 2900 ElaboratedTypeKeyword Keyword, 2901 NestedNameSpecifier *Qualifier, 2902 const IdentifierInfo *Name, 2903 unsigned NumArgs, 2904 const TemplateArgument *Args); 2905 2906 static bool classof(const Type *T) { 2907 return T->getTypeClass() == DependentTemplateSpecialization; 2908 } 2909 static bool classof(const DependentTemplateSpecializationType *T) { 2910 return true; 2911 } 2912}; 2913 2914/// ObjCObjectType - Represents a class type in Objective C. 2915/// Every Objective C type is a combination of a base type and a 2916/// list of protocols. 2917/// 2918/// Given the following declarations: 2919/// @class C; 2920/// @protocol P; 2921/// 2922/// 'C' is an ObjCInterfaceType C. It is sugar for an ObjCObjectType 2923/// with base C and no protocols. 2924/// 2925/// 'C<P>' is an ObjCObjectType with base C and protocol list [P]. 2926/// 2927/// 'id' is a TypedefType which is sugar for an ObjCPointerType whose 2928/// pointee is an ObjCObjectType with base BuiltinType::ObjCIdType 2929/// and no protocols. 2930/// 2931/// 'id<P>' is an ObjCPointerType whose pointee is an ObjCObjecType 2932/// with base BuiltinType::ObjCIdType and protocol list [P]. Eventually 2933/// this should get its own sugar class to better represent the source. 2934class ObjCObjectType : public Type { 2935 // Pad the bit count up so that NumProtocols is 2-byte aligned 2936 unsigned : BitsRemainingInType - 16; 2937 2938 /// \brief The number of protocols stored after the 2939 /// ObjCObjectPointerType node. 2940 /// 2941 /// These protocols are those written directly on the type. If 2942 /// protocol qualifiers ever become additive, the iterators will 2943 /// get kindof complicated. 2944 /// 2945 /// In the canonical object type, these are sorted alphabetically 2946 /// and uniqued. 2947 unsigned NumProtocols : 16; 2948 2949 /// Either a BuiltinType or an InterfaceType or sugar for either. 2950 QualType BaseType; 2951 2952 ObjCProtocolDecl * const *getProtocolStorage() const { 2953 return const_cast<ObjCObjectType*>(this)->getProtocolStorage(); 2954 } 2955 2956 ObjCProtocolDecl **getProtocolStorage(); 2957 2958protected: 2959 ObjCObjectType(QualType Canonical, QualType Base, 2960 ObjCProtocolDecl * const *Protocols, unsigned NumProtocols); 2961 2962 enum Nonce_ObjCInterface { Nonce_ObjCInterface }; 2963 ObjCObjectType(enum Nonce_ObjCInterface) 2964 : Type(ObjCInterface, QualType(), false), 2965 NumProtocols(0), 2966 BaseType(QualType(this_(), 0)) {} 2967 2968protected: 2969 Linkage getLinkageImpl() const; // key function 2970 2971public: 2972 /// getBaseType - Gets the base type of this object type. This is 2973 /// always (possibly sugar for) one of: 2974 /// - the 'id' builtin type (as opposed to the 'id' type visible to the 2975 /// user, which is a typedef for an ObjCPointerType) 2976 /// - the 'Class' builtin type (same caveat) 2977 /// - an ObjCObjectType (currently always an ObjCInterfaceType) 2978 QualType getBaseType() const { return BaseType; } 2979 2980 bool isObjCId() const { 2981 return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCId); 2982 } 2983 bool isObjCClass() const { 2984 return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCClass); 2985 } 2986 bool isObjCUnqualifiedId() const { return qual_empty() && isObjCId(); } 2987 bool isObjCUnqualifiedClass() const { return qual_empty() && isObjCClass(); } 2988 bool isObjCUnqualifiedIdOrClass() const { 2989 if (!qual_empty()) return false; 2990 if (const BuiltinType *T = getBaseType()->getAs<BuiltinType>()) 2991 return T->getKind() == BuiltinType::ObjCId || 2992 T->getKind() == BuiltinType::ObjCClass; 2993 return false; 2994 } 2995 bool isObjCQualifiedId() const { return !qual_empty() && isObjCId(); } 2996 bool isObjCQualifiedClass() const { return !qual_empty() && isObjCClass(); } 2997 2998 /// Gets the interface declaration for this object type, if the base type 2999 /// really is an interface. 3000 ObjCInterfaceDecl *getInterface() const; 3001 3002 typedef ObjCProtocolDecl * const *qual_iterator; 3003 3004 qual_iterator qual_begin() const { return getProtocolStorage(); } 3005 qual_iterator qual_end() const { return qual_begin() + getNumProtocols(); } 3006 3007 bool qual_empty() const { return getNumProtocols() == 0; } 3008 3009 /// getNumProtocols - Return the number of qualifying protocols in this 3010 /// interface type, or 0 if there are none. 3011 unsigned getNumProtocols() const { return NumProtocols; } 3012 3013 /// \brief Fetch a protocol by index. 3014 ObjCProtocolDecl *getProtocol(unsigned I) const { 3015 assert(I < getNumProtocols() && "Out-of-range protocol access"); 3016 return qual_begin()[I]; 3017 } 3018 3019 bool isSugared() const { return false; } 3020 QualType desugar() const { return QualType(this, 0); } 3021 3022 static bool classof(const Type *T) { 3023 return T->getTypeClass() == ObjCObject || 3024 T->getTypeClass() == ObjCInterface; 3025 } 3026 static bool classof(const ObjCObjectType *) { return true; } 3027}; 3028 3029/// ObjCObjectTypeImpl - A class providing a concrete implementation 3030/// of ObjCObjectType, so as to not increase the footprint of 3031/// ObjCInterfaceType. Code outside of ASTContext and the core type 3032/// system should not reference this type. 3033class ObjCObjectTypeImpl : public ObjCObjectType, public llvm::FoldingSetNode { 3034 friend class ASTContext; 3035 3036 // If anyone adds fields here, ObjCObjectType::getProtocolStorage() 3037 // will need to be modified. 3038 3039 ObjCObjectTypeImpl(QualType Canonical, QualType Base, 3040 ObjCProtocolDecl * const *Protocols, 3041 unsigned NumProtocols) 3042 : ObjCObjectType(Canonical, Base, Protocols, NumProtocols) {} 3043 3044public: 3045 void Profile(llvm::FoldingSetNodeID &ID); 3046 static void Profile(llvm::FoldingSetNodeID &ID, 3047 QualType Base, 3048 ObjCProtocolDecl *const *protocols, 3049 unsigned NumProtocols); 3050}; 3051 3052inline ObjCProtocolDecl **ObjCObjectType::getProtocolStorage() { 3053 return reinterpret_cast<ObjCProtocolDecl**>( 3054 static_cast<ObjCObjectTypeImpl*>(this) + 1); 3055} 3056 3057/// ObjCInterfaceType - Interfaces are the core concept in Objective-C for 3058/// object oriented design. They basically correspond to C++ classes. There 3059/// are two kinds of interface types, normal interfaces like "NSString" and 3060/// qualified interfaces, which are qualified with a protocol list like 3061/// "NSString<NSCopyable, NSAmazing>". 3062/// 3063/// ObjCInterfaceType guarantees the following properties when considered 3064/// as a subtype of its superclass, ObjCObjectType: 3065/// - There are no protocol qualifiers. To reinforce this, code which 3066/// tries to invoke the protocol methods via an ObjCInterfaceType will 3067/// fail to compile. 3068/// - It is its own base type. That is, if T is an ObjCInterfaceType*, 3069/// T->getBaseType() == QualType(T, 0). 3070class ObjCInterfaceType : public ObjCObjectType { 3071 ObjCInterfaceDecl *Decl; 3072 3073 ObjCInterfaceType(const ObjCInterfaceDecl *D) 3074 : ObjCObjectType(Nonce_ObjCInterface), 3075 Decl(const_cast<ObjCInterfaceDecl*>(D)) {} 3076 friend class ASTContext; // ASTContext creates these. 3077public: 3078 /// getDecl - Get the declaration of this interface. 3079 ObjCInterfaceDecl *getDecl() const { return Decl; } 3080 3081 bool isSugared() const { return false; } 3082 QualType desugar() const { return QualType(this, 0); } 3083 3084 static bool classof(const Type *T) { 3085 return T->getTypeClass() == ObjCInterface; 3086 } 3087 static bool classof(const ObjCInterfaceType *) { return true; } 3088 3089 // Nonsense to "hide" certain members of ObjCObjectType within this 3090 // class. People asking for protocols on an ObjCInterfaceType are 3091 // not going to get what they want: ObjCInterfaceTypes are 3092 // guaranteed to have no protocols. 3093 enum { 3094 qual_iterator, 3095 qual_begin, 3096 qual_end, 3097 getNumProtocols, 3098 getProtocol 3099 }; 3100}; 3101 3102inline ObjCInterfaceDecl *ObjCObjectType::getInterface() const { 3103 if (const ObjCInterfaceType *T = 3104 getBaseType()->getAs<ObjCInterfaceType>()) 3105 return T->getDecl(); 3106 return 0; 3107} 3108 3109/// ObjCObjectPointerType - Used to represent a pointer to an 3110/// Objective C object. These are constructed from pointer 3111/// declarators when the pointee type is an ObjCObjectType (or sugar 3112/// for one). In addition, the 'id' and 'Class' types are typedefs 3113/// for these, and the protocol-qualified types 'id<P>' and 'Class<P>' 3114/// are translated into these. 3115/// 3116/// Pointers to pointers to Objective C objects are still PointerTypes; 3117/// only the first level of pointer gets it own type implementation. 3118class ObjCObjectPointerType : public Type, public llvm::FoldingSetNode { 3119 QualType PointeeType; 3120 3121 ObjCObjectPointerType(QualType Canonical, QualType Pointee) 3122 : Type(ObjCObjectPointer, Canonical, false), 3123 PointeeType(Pointee) {} 3124 friend class ASTContext; // ASTContext creates these. 3125 3126protected: 3127 virtual Linkage getLinkageImpl() const; 3128 3129public: 3130 /// getPointeeType - Gets the type pointed to by this ObjC pointer. 3131 /// The result will always be an ObjCObjectType or sugar thereof. 3132 QualType getPointeeType() const { return PointeeType; } 3133 3134 /// getObjCObjectType - Gets the type pointed to by this ObjC 3135 /// pointer. This method always returns non-null. 3136 /// 3137 /// This method is equivalent to getPointeeType() except that 3138 /// it discards any typedefs (or other sugar) between this 3139 /// type and the "outermost" object type. So for: 3140 /// @class A; @protocol P; @protocol Q; 3141 /// typedef A<P> AP; 3142 /// typedef A A1; 3143 /// typedef A1<P> A1P; 3144 /// typedef A1P<Q> A1PQ; 3145 /// For 'A*', getObjectType() will return 'A'. 3146 /// For 'A<P>*', getObjectType() will return 'A<P>'. 3147 /// For 'AP*', getObjectType() will return 'A<P>'. 3148 /// For 'A1*', getObjectType() will return 'A'. 3149 /// For 'A1<P>*', getObjectType() will return 'A1<P>'. 3150 /// For 'A1P*', getObjectType() will return 'A1<P>'. 3151 /// For 'A1PQ*', getObjectType() will return 'A1<Q>', because 3152 /// adding protocols to a protocol-qualified base discards the 3153 /// old qualifiers (for now). But if it didn't, getObjectType() 3154 /// would return 'A1P<Q>' (and we'd have to make iterating over 3155 /// qualifiers more complicated). 3156 const ObjCObjectType *getObjectType() const { 3157 return PointeeType->getAs<ObjCObjectType>(); 3158 } 3159 3160 /// getInterfaceType - If this pointer points to an Objective C 3161 /// @interface type, gets the type for that interface. Any protocol 3162 /// qualifiers on the interface are ignored. 3163 /// 3164 /// \return null if the base type for this pointer is 'id' or 'Class' 3165 const ObjCInterfaceType *getInterfaceType() const { 3166 return getObjectType()->getBaseType()->getAs<ObjCInterfaceType>(); 3167 } 3168 3169 /// getInterfaceDecl - If this pointer points to an Objective @interface 3170 /// type, gets the declaration for that interface. 3171 /// 3172 /// \return null if the base type for this pointer is 'id' or 'Class' 3173 ObjCInterfaceDecl *getInterfaceDecl() const { 3174 return getObjectType()->getInterface(); 3175 } 3176 3177 /// isObjCIdType - True if this is equivalent to the 'id' type, i.e. if 3178 /// its object type is the primitive 'id' type with no protocols. 3179 bool isObjCIdType() const { 3180 return getObjectType()->isObjCUnqualifiedId(); 3181 } 3182 3183 /// isObjCClassType - True if this is equivalent to the 'Class' type, 3184 /// i.e. if its object tive is the primitive 'Class' type with no protocols. 3185 bool isObjCClassType() const { 3186 return getObjectType()->isObjCUnqualifiedClass(); 3187 } 3188 3189 /// isObjCQualifiedIdType - True if this is equivalent to 'id<P>' for some 3190 /// non-empty set of protocols. 3191 bool isObjCQualifiedIdType() const { 3192 return getObjectType()->isObjCQualifiedId(); 3193 } 3194 3195 /// isObjCQualifiedClassType - True if this is equivalent to 'Class<P>' for 3196 /// some non-empty set of protocols. 3197 bool isObjCQualifiedClassType() const { 3198 return getObjectType()->isObjCQualifiedClass(); 3199 } 3200 3201 /// An iterator over the qualifiers on the object type. Provided 3202 /// for convenience. This will always iterate over the full set of 3203 /// protocols on a type, not just those provided directly. 3204 typedef ObjCObjectType::qual_iterator qual_iterator; 3205 3206 qual_iterator qual_begin() const { 3207 return getObjectType()->qual_begin(); 3208 } 3209 qual_iterator qual_end() const { 3210 return getObjectType()->qual_end(); 3211 } 3212 bool qual_empty() const { return getObjectType()->qual_empty(); } 3213 3214 /// getNumProtocols - Return the number of qualifying protocols on 3215 /// the object type. 3216 unsigned getNumProtocols() const { 3217 return getObjectType()->getNumProtocols(); 3218 } 3219 3220 /// \brief Retrieve a qualifying protocol by index on the object 3221 /// type. 3222 ObjCProtocolDecl *getProtocol(unsigned I) const { 3223 return getObjectType()->getProtocol(I); 3224 } 3225 3226 bool isSugared() const { return false; } 3227 QualType desugar() const { return QualType(this, 0); } 3228 3229 void Profile(llvm::FoldingSetNodeID &ID) { 3230 Profile(ID, getPointeeType()); 3231 } 3232 static void Profile(llvm::FoldingSetNodeID &ID, QualType T) { 3233 ID.AddPointer(T.getAsOpaquePtr()); 3234 } 3235 static bool classof(const Type *T) { 3236 return T->getTypeClass() == ObjCObjectPointer; 3237 } 3238 static bool classof(const ObjCObjectPointerType *) { return true; } 3239}; 3240 3241/// A qualifier set is used to build a set of qualifiers. 3242class QualifierCollector : public Qualifiers { 3243 ASTContext *Context; 3244 3245public: 3246 QualifierCollector(Qualifiers Qs = Qualifiers()) 3247 : Qualifiers(Qs), Context(0) {} 3248 QualifierCollector(ASTContext &Context, Qualifiers Qs = Qualifiers()) 3249 : Qualifiers(Qs), Context(&Context) {} 3250 3251 void setContext(ASTContext &C) { Context = &C; } 3252 3253 /// Collect any qualifiers on the given type and return an 3254 /// unqualified type. 3255 const Type *strip(QualType QT) { 3256 addFastQualifiers(QT.getLocalFastQualifiers()); 3257 if (QT.hasLocalNonFastQualifiers()) { 3258 const ExtQuals *EQ = QT.getExtQualsUnsafe(); 3259 Context = &EQ->getContext(); 3260 addQualifiers(EQ->getQualifiers()); 3261 return EQ->getBaseType(); 3262 } 3263 return QT.getTypePtrUnsafe(); 3264 } 3265 3266 /// Apply the collected qualifiers to the given type. 3267 QualType apply(QualType QT) const; 3268 3269 /// Apply the collected qualifiers to the given type. 3270 QualType apply(const Type* T) const; 3271 3272}; 3273 3274 3275// Inline function definitions. 3276 3277inline bool QualType::isCanonical() const { 3278 const Type *T = getTypePtr(); 3279 if (hasLocalQualifiers()) 3280 return T->isCanonicalUnqualified() && !isa<ArrayType>(T); 3281 return T->isCanonicalUnqualified(); 3282} 3283 3284inline bool QualType::isCanonicalAsParam() const { 3285 if (hasLocalQualifiers()) return false; 3286 const Type *T = getTypePtr(); 3287 return T->isCanonicalUnqualified() && 3288 !isa<FunctionType>(T) && !isa<ArrayType>(T); 3289} 3290 3291inline bool QualType::isConstQualified() const { 3292 return isLocalConstQualified() || 3293 getTypePtr()->getCanonicalTypeInternal().isLocalConstQualified(); 3294} 3295 3296inline bool QualType::isRestrictQualified() const { 3297 return isLocalRestrictQualified() || 3298 getTypePtr()->getCanonicalTypeInternal().isLocalRestrictQualified(); 3299} 3300 3301 3302inline bool QualType::isVolatileQualified() const { 3303 return isLocalVolatileQualified() || 3304 getTypePtr()->getCanonicalTypeInternal().isLocalVolatileQualified(); 3305} 3306 3307inline bool QualType::hasQualifiers() const { 3308 return hasLocalQualifiers() || 3309 getTypePtr()->getCanonicalTypeInternal().hasLocalQualifiers(); 3310} 3311 3312inline Qualifiers QualType::getQualifiers() const { 3313 Qualifiers Quals = getLocalQualifiers(); 3314 Quals.addQualifiers( 3315 getTypePtr()->getCanonicalTypeInternal().getLocalQualifiers()); 3316 return Quals; 3317} 3318 3319inline unsigned QualType::getCVRQualifiers() const { 3320 return getLocalCVRQualifiers() | 3321 getTypePtr()->getCanonicalTypeInternal().getLocalCVRQualifiers(); 3322} 3323 3324/// getCVRQualifiersThroughArrayTypes - If there are CVR qualifiers for this 3325/// type, returns them. Otherwise, if this is an array type, recurses 3326/// on the element type until some qualifiers have been found or a non-array 3327/// type reached. 3328inline unsigned QualType::getCVRQualifiersThroughArrayTypes() const { 3329 if (unsigned Quals = getCVRQualifiers()) 3330 return Quals; 3331 QualType CT = getTypePtr()->getCanonicalTypeInternal(); 3332 if (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 3333 return AT->getElementType().getCVRQualifiersThroughArrayTypes(); 3334 return 0; 3335} 3336 3337inline void QualType::removeConst() { 3338 removeFastQualifiers(Qualifiers::Const); 3339} 3340 3341inline void QualType::removeRestrict() { 3342 removeFastQualifiers(Qualifiers::Restrict); 3343} 3344 3345inline void QualType::removeVolatile() { 3346 QualifierCollector Qc; 3347 const Type *Ty = Qc.strip(*this); 3348 if (Qc.hasVolatile()) { 3349 Qc.removeVolatile(); 3350 *this = Qc.apply(Ty); 3351 } 3352} 3353 3354inline void QualType::removeCVRQualifiers(unsigned Mask) { 3355 assert(!(Mask & ~Qualifiers::CVRMask) && "mask has non-CVR bits"); 3356 3357 // Fast path: we don't need to touch the slow qualifiers. 3358 if (!(Mask & ~Qualifiers::FastMask)) { 3359 removeFastQualifiers(Mask); 3360 return; 3361 } 3362 3363 QualifierCollector Qc; 3364 const Type *Ty = Qc.strip(*this); 3365 Qc.removeCVRQualifiers(Mask); 3366 *this = Qc.apply(Ty); 3367} 3368 3369/// getAddressSpace - Return the address space of this type. 3370inline unsigned QualType::getAddressSpace() const { 3371 if (hasLocalNonFastQualifiers()) { 3372 const ExtQuals *EQ = getExtQualsUnsafe(); 3373 if (EQ->hasAddressSpace()) 3374 return EQ->getAddressSpace(); 3375 } 3376 3377 QualType CT = getTypePtr()->getCanonicalTypeInternal(); 3378 if (CT.hasLocalNonFastQualifiers()) { 3379 const ExtQuals *EQ = CT.getExtQualsUnsafe(); 3380 if (EQ->hasAddressSpace()) 3381 return EQ->getAddressSpace(); 3382 } 3383 3384 if (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 3385 return AT->getElementType().getAddressSpace(); 3386 if (const RecordType *RT = dyn_cast<RecordType>(CT)) 3387 return RT->getAddressSpace(); 3388 return 0; 3389} 3390 3391/// getObjCGCAttr - Return the gc attribute of this type. 3392inline Qualifiers::GC QualType::getObjCGCAttr() const { 3393 if (hasLocalNonFastQualifiers()) { 3394 const ExtQuals *EQ = getExtQualsUnsafe(); 3395 if (EQ->hasObjCGCAttr()) 3396 return EQ->getObjCGCAttr(); 3397 } 3398 3399 QualType CT = getTypePtr()->getCanonicalTypeInternal(); 3400 if (CT.hasLocalNonFastQualifiers()) { 3401 const ExtQuals *EQ = CT.getExtQualsUnsafe(); 3402 if (EQ->hasObjCGCAttr()) 3403 return EQ->getObjCGCAttr(); 3404 } 3405 3406 if (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 3407 return AT->getElementType().getObjCGCAttr(); 3408 if (const ObjCObjectPointerType *PT = CT->getAs<ObjCObjectPointerType>()) 3409 return PT->getPointeeType().getObjCGCAttr(); 3410 // We most look at all pointer types, not just pointer to interface types. 3411 if (const PointerType *PT = CT->getAs<PointerType>()) 3412 return PT->getPointeeType().getObjCGCAttr(); 3413 return Qualifiers::GCNone; 3414} 3415 3416inline FunctionType::ExtInfo getFunctionExtInfo(const Type &t) { 3417 if (const PointerType *PT = t.getAs<PointerType>()) { 3418 if (const FunctionType *FT = PT->getPointeeType()->getAs<FunctionType>()) 3419 return FT->getExtInfo(); 3420 } else if (const FunctionType *FT = t.getAs<FunctionType>()) 3421 return FT->getExtInfo(); 3422 3423 return FunctionType::ExtInfo(); 3424} 3425 3426inline FunctionType::ExtInfo getFunctionExtInfo(QualType t) { 3427 return getFunctionExtInfo(*t); 3428} 3429 3430/// \brief Determine whether this set of qualifiers is a superset of the given 3431/// set of qualifiers. 3432inline bool Qualifiers::isSupersetOf(Qualifiers Other) const { 3433 return Mask != Other.Mask && (Mask | Other.Mask) == Mask; 3434} 3435 3436/// isMoreQualifiedThan - Determine whether this type is more 3437/// qualified than the Other type. For example, "const volatile int" 3438/// is more qualified than "const int", "volatile int", and 3439/// "int". However, it is not more qualified than "const volatile 3440/// int". 3441inline bool QualType::isMoreQualifiedThan(QualType Other) const { 3442 // FIXME: work on arbitrary qualifiers 3443 unsigned MyQuals = this->getCVRQualifiersThroughArrayTypes(); 3444 unsigned OtherQuals = Other.getCVRQualifiersThroughArrayTypes(); 3445 if (getAddressSpace() != Other.getAddressSpace()) 3446 return false; 3447 return MyQuals != OtherQuals && (MyQuals | OtherQuals) == MyQuals; 3448} 3449 3450/// isAtLeastAsQualifiedAs - Determine whether this type is at last 3451/// as qualified as the Other type. For example, "const volatile 3452/// int" is at least as qualified as "const int", "volatile int", 3453/// "int", and "const volatile int". 3454inline bool QualType::isAtLeastAsQualifiedAs(QualType Other) const { 3455 // FIXME: work on arbitrary qualifiers 3456 unsigned MyQuals = this->getCVRQualifiersThroughArrayTypes(); 3457 unsigned OtherQuals = Other.getCVRQualifiersThroughArrayTypes(); 3458 if (getAddressSpace() != Other.getAddressSpace()) 3459 return false; 3460 return (MyQuals | OtherQuals) == MyQuals; 3461} 3462 3463/// getNonReferenceType - If Type is a reference type (e.g., const 3464/// int&), returns the type that the reference refers to ("const 3465/// int"). Otherwise, returns the type itself. This routine is used 3466/// throughout Sema to implement C++ 5p6: 3467/// 3468/// If an expression initially has the type "reference to T" (8.3.2, 3469/// 8.5.3), the type is adjusted to "T" prior to any further 3470/// analysis, the expression designates the object or function 3471/// denoted by the reference, and the expression is an lvalue. 3472inline QualType QualType::getNonReferenceType() const { 3473 if (const ReferenceType *RefType = (*this)->getAs<ReferenceType>()) 3474 return RefType->getPointeeType(); 3475 else 3476 return *this; 3477} 3478 3479inline bool Type::isFunctionType() const { 3480 return isa<FunctionType>(CanonicalType); 3481} 3482inline bool Type::isPointerType() const { 3483 return isa<PointerType>(CanonicalType); 3484} 3485inline bool Type::isAnyPointerType() const { 3486 return isPointerType() || isObjCObjectPointerType(); 3487} 3488inline bool Type::isBlockPointerType() const { 3489 return isa<BlockPointerType>(CanonicalType); 3490} 3491inline bool Type::isReferenceType() const { 3492 return isa<ReferenceType>(CanonicalType); 3493} 3494inline bool Type::isLValueReferenceType() const { 3495 return isa<LValueReferenceType>(CanonicalType); 3496} 3497inline bool Type::isRValueReferenceType() const { 3498 return isa<RValueReferenceType>(CanonicalType); 3499} 3500inline bool Type::isFunctionPointerType() const { 3501 if (const PointerType* T = getAs<PointerType>()) 3502 return T->getPointeeType()->isFunctionType(); 3503 else 3504 return false; 3505} 3506inline bool Type::isMemberPointerType() const { 3507 return isa<MemberPointerType>(CanonicalType); 3508} 3509inline bool Type::isMemberFunctionPointerType() const { 3510 if (const MemberPointerType* T = getAs<MemberPointerType>()) 3511 return T->isMemberFunctionPointer(); 3512 else 3513 return false; 3514} 3515inline bool Type::isMemberDataPointerType() const { 3516 if (const MemberPointerType* T = getAs<MemberPointerType>()) 3517 return T->isMemberDataPointer(); 3518 else 3519 return false; 3520} 3521inline bool Type::isArrayType() const { 3522 return isa<ArrayType>(CanonicalType); 3523} 3524inline bool Type::isConstantArrayType() const { 3525 return isa<ConstantArrayType>(CanonicalType); 3526} 3527inline bool Type::isIncompleteArrayType() const { 3528 return isa<IncompleteArrayType>(CanonicalType); 3529} 3530inline bool Type::isVariableArrayType() const { 3531 return isa<VariableArrayType>(CanonicalType); 3532} 3533inline bool Type::isDependentSizedArrayType() const { 3534 return isa<DependentSizedArrayType>(CanonicalType); 3535} 3536inline bool Type::isRecordType() const { 3537 return isa<RecordType>(CanonicalType); 3538} 3539inline bool Type::isAnyComplexType() const { 3540 return isa<ComplexType>(CanonicalType); 3541} 3542inline bool Type::isVectorType() const { 3543 return isa<VectorType>(CanonicalType); 3544} 3545inline bool Type::isExtVectorType() const { 3546 return isa<ExtVectorType>(CanonicalType); 3547} 3548inline bool Type::isObjCObjectPointerType() const { 3549 return isa<ObjCObjectPointerType>(CanonicalType); 3550} 3551inline bool Type::isObjCObjectType() const { 3552 return isa<ObjCObjectType>(CanonicalType); 3553} 3554inline bool Type::isObjCObjectOrInterfaceType() const { 3555 return isa<ObjCInterfaceType>(CanonicalType) || 3556 isa<ObjCObjectType>(CanonicalType); 3557} 3558 3559inline bool Type::isObjCQualifiedIdType() const { 3560 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 3561 return OPT->isObjCQualifiedIdType(); 3562 return false; 3563} 3564inline bool Type::isObjCQualifiedClassType() const { 3565 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 3566 return OPT->isObjCQualifiedClassType(); 3567 return false; 3568} 3569inline bool Type::isObjCIdType() const { 3570 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 3571 return OPT->isObjCIdType(); 3572 return false; 3573} 3574inline bool Type::isObjCClassType() const { 3575 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 3576 return OPT->isObjCClassType(); 3577 return false; 3578} 3579inline bool Type::isObjCSelType() const { 3580 if (const PointerType *OPT = getAs<PointerType>()) 3581 return OPT->getPointeeType()->isSpecificBuiltinType(BuiltinType::ObjCSel); 3582 return false; 3583} 3584inline bool Type::isObjCBuiltinType() const { 3585 return isObjCIdType() || isObjCClassType() || isObjCSelType(); 3586} 3587inline bool Type::isTemplateTypeParmType() const { 3588 return isa<TemplateTypeParmType>(CanonicalType); 3589} 3590 3591inline bool Type::isBuiltinType() const { 3592 return getAs<BuiltinType>(); 3593} 3594 3595inline bool Type::isSpecificBuiltinType(unsigned K) const { 3596 if (const BuiltinType *BT = getAs<BuiltinType>()) 3597 if (BT->getKind() == (BuiltinType::Kind) K) 3598 return true; 3599 return false; 3600} 3601 3602/// \brief Determines whether this is a type for which one can define 3603/// an overloaded operator. 3604inline bool Type::isOverloadableType() const { 3605 return isDependentType() || isRecordType() || isEnumeralType(); 3606} 3607 3608inline bool Type::hasPointerRepresentation() const { 3609 return (isPointerType() || isReferenceType() || isBlockPointerType() || 3610 isObjCObjectPointerType() || isNullPtrType()); 3611} 3612 3613inline bool Type::hasObjCPointerRepresentation() const { 3614 return isObjCObjectPointerType(); 3615} 3616 3617/// Insertion operator for diagnostics. This allows sending QualType's into a 3618/// diagnostic with <<. 3619inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB, 3620 QualType T) { 3621 DB.AddTaggedVal(reinterpret_cast<intptr_t>(T.getAsOpaquePtr()), 3622 Diagnostic::ak_qualtype); 3623 return DB; 3624} 3625 3626/// Insertion operator for partial diagnostics. This allows sending QualType's 3627/// into a diagnostic with <<. 3628inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD, 3629 QualType T) { 3630 PD.AddTaggedVal(reinterpret_cast<intptr_t>(T.getAsOpaquePtr()), 3631 Diagnostic::ak_qualtype); 3632 return PD; 3633} 3634 3635// Helper class template that is used by Type::getAs to ensure that one does 3636// not try to look through a qualified type to get to an array type. 3637template<typename T, 3638 bool isArrayType = (llvm::is_same<T, ArrayType>::value || 3639 llvm::is_base_of<ArrayType, T>::value)> 3640struct ArrayType_cannot_be_used_with_getAs { }; 3641 3642template<typename T> 3643struct ArrayType_cannot_be_used_with_getAs<T, true>; 3644 3645/// Member-template getAs<specific type>'. 3646template <typename T> const T *Type::getAs() const { 3647 ArrayType_cannot_be_used_with_getAs<T> at; 3648 (void)at; 3649 3650 // If this is directly a T type, return it. 3651 if (const T *Ty = dyn_cast<T>(this)) 3652 return Ty; 3653 3654 // If the canonical form of this type isn't the right kind, reject it. 3655 if (!isa<T>(CanonicalType)) 3656 return 0; 3657 3658 // If this is a typedef for the type, strip the typedef off without 3659 // losing all typedef information. 3660 return cast<T>(getUnqualifiedDesugaredType()); 3661} 3662 3663} // end namespace clang 3664 3665#endif 3666