Type.h revision 1274ccd90aec0b205fc838c3d504821ccfb55482
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 /// \brief Determine whether this type is an integral or unscoped enumeration 883 /// type. 884 bool isIntegralOrUnscopedEnumerationType() const; 885 886 /// Floating point categories. 887 bool isRealFloatingType() const; // C99 6.2.5p10 (float, double, long double) 888 /// isComplexType() does *not* include complex integers (a GCC extension). 889 /// isComplexIntegerType() can be used to test for complex integers. 890 bool isComplexType() const; // C99 6.2.5p11 (complex) 891 bool isAnyComplexType() const; // C99 6.2.5p11 (complex) + Complex Int. 892 bool isFloatingType() const; // C99 6.2.5p11 (real floating + complex) 893 bool isRealType() const; // C99 6.2.5p17 (real floating + integer) 894 bool isArithmeticType() const; // C99 6.2.5p18 (integer + floating) 895 bool isVoidType() const; // C99 6.2.5p19 896 bool isDerivedType() const; // C99 6.2.5p20 897 bool isScalarType() const; // C99 6.2.5p21 (arithmetic + pointers) 898 bool isAggregateType() const; 899 900 // Type Predicates: Check to see if this type is structurally the specified 901 // type, ignoring typedefs and qualifiers. 902 bool isFunctionType() const; 903 bool isFunctionNoProtoType() const { return getAs<FunctionNoProtoType>(); } 904 bool isFunctionProtoType() const { return getAs<FunctionProtoType>(); } 905 bool isPointerType() const; 906 bool isAnyPointerType() const; // Any C pointer or ObjC object pointer 907 bool isBlockPointerType() const; 908 bool isVoidPointerType() const; 909 bool isReferenceType() const; 910 bool isLValueReferenceType() const; 911 bool isRValueReferenceType() const; 912 bool isFunctionPointerType() const; 913 bool isMemberPointerType() const; 914 bool isMemberFunctionPointerType() const; 915 bool isMemberDataPointerType() const; 916 bool isArrayType() const; 917 bool isConstantArrayType() const; 918 bool isIncompleteArrayType() const; 919 bool isVariableArrayType() const; 920 bool isDependentSizedArrayType() const; 921 bool isRecordType() const; 922 bool isClassType() const; 923 bool isStructureType() const; 924 bool isStructureOrClassType() const; 925 bool isUnionType() const; 926 bool isComplexIntegerType() const; // GCC _Complex integer type. 927 bool isVectorType() const; // GCC vector type. 928 bool isExtVectorType() const; // Extended vector type. 929 bool isObjCObjectPointerType() const; // Pointer to *any* ObjC object. 930 // FIXME: change this to 'raw' interface type, so we can used 'interface' type 931 // for the common case. 932 bool isObjCObjectType() const; // NSString or typeof(*(id)0) 933 bool isObjCQualifiedInterfaceType() const; // NSString<foo> 934 bool isObjCQualifiedIdType() const; // id<foo> 935 bool isObjCQualifiedClassType() const; // Class<foo> 936 bool isObjCObjectOrInterfaceType() const; 937 bool isObjCIdType() const; // id 938 bool isObjCClassType() const; // Class 939 bool isObjCSelType() const; // Class 940 bool isObjCBuiltinType() const; // 'id' or 'Class' 941 bool isTemplateTypeParmType() const; // C++ template type parameter 942 bool isNullPtrType() const; // C++0x nullptr_t 943 944 /// isDependentType - Whether this type is a dependent type, meaning 945 /// that its definition somehow depends on a template parameter 946 /// (C++ [temp.dep.type]). 947 bool isDependentType() const { return Dependent; } 948 bool isOverloadableType() const; 949 950 /// \brief Determine wither this type is a C++ elaborated-type-specifier. 951 bool isElaboratedTypeSpecifier() const; 952 953 /// hasPointerRepresentation - Whether this type is represented 954 /// natively as a pointer; this includes pointers, references, block 955 /// pointers, and Objective-C interface, qualified id, and qualified 956 /// interface types, as well as nullptr_t. 957 bool hasPointerRepresentation() const; 958 959 /// hasObjCPointerRepresentation - Whether this type can represent 960 /// an objective pointer type for the purpose of GC'ability 961 bool hasObjCPointerRepresentation() const; 962 963 /// \brief Determine whether this type has an integer representation 964 /// of some sort, e.g., it is an integer type or a vector. 965 bool hasIntegerRepresentation() const; 966 967 /// \brief Determine whether this type has an signed integer representation 968 /// of some sort, e.g., it is an signed integer type or a vector. 969 bool hasSignedIntegerRepresentation() const; 970 971 /// \brief Determine whether this type has an unsigned integer representation 972 /// of some sort, e.g., it is an unsigned integer type or a vector. 973 bool hasUnsignedIntegerRepresentation() const; 974 975 /// \brief Determine whether this type has a floating-point representation 976 /// of some sort, e.g., it is a floating-point type or a vector thereof. 977 bool hasFloatingRepresentation() const; 978 979 // Type Checking Functions: Check to see if this type is structurally the 980 // specified type, ignoring typedefs and qualifiers, and return a pointer to 981 // the best type we can. 982 const RecordType *getAsStructureType() const; 983 /// NOTE: getAs*ArrayType are methods on ASTContext. 984 const RecordType *getAsUnionType() const; 985 const ComplexType *getAsComplexIntegerType() const; // GCC complex int type. 986 // The following is a convenience method that returns an ObjCObjectPointerType 987 // for object declared using an interface. 988 const ObjCObjectPointerType *getAsObjCInterfacePointerType() const; 989 const ObjCObjectPointerType *getAsObjCQualifiedIdType() const; 990 const ObjCObjectType *getAsObjCQualifiedInterfaceType() const; 991 const CXXRecordDecl *getCXXRecordDeclForPointerType() const; 992 993 /// \brief Retrieves the CXXRecordDecl that this type refers to, either 994 /// because the type is a RecordType or because it is the injected-class-name 995 /// type of a class template or class template partial specialization. 996 CXXRecordDecl *getAsCXXRecordDecl() const; 997 998 // Member-template getAs<specific type>'. Look through sugar for 999 // an instance of <specific type>. This scheme will eventually 1000 // replace the specific getAsXXXX methods above. 1001 // 1002 // There are some specializations of this member template listed 1003 // immediately following this class. 1004 template <typename T> const T *getAs() const; 1005 1006 /// getArrayElementTypeNoTypeQual - If this is an array type, return the 1007 /// element type of the array, potentially with type qualifiers missing. 1008 /// This method should never be used when type qualifiers are meaningful. 1009 const Type *getArrayElementTypeNoTypeQual() const; 1010 1011 /// getPointeeType - If this is a pointer, ObjC object pointer, or block 1012 /// pointer, this returns the respective pointee. 1013 QualType getPointeeType() const; 1014 1015 /// getUnqualifiedDesugaredType() - Return the specified type with 1016 /// any "sugar" removed from the type, removing any typedefs, 1017 /// typeofs, etc., as well as any qualifiers. 1018 const Type *getUnqualifiedDesugaredType() const; 1019 1020 /// More type predicates useful for type checking/promotion 1021 bool isPromotableIntegerType() const; // C99 6.3.1.1p2 1022 1023 /// isSignedIntegerType - Return true if this is an integer type that is 1024 /// signed, according to C99 6.2.5p4 [char, signed char, short, int, long..], 1025 /// an enum decl which has a signed representation, or a vector of signed 1026 /// integer element type. 1027 bool isSignedIntegerType() const; 1028 1029 /// isUnsignedIntegerType - Return true if this is an integer type that is 1030 /// unsigned, according to C99 6.2.5p6 [which returns true for _Bool], an enum 1031 /// decl which has an unsigned representation, or a vector of unsigned integer 1032 /// element type. 1033 bool isUnsignedIntegerType() const; 1034 1035 /// isConstantSizeType - Return true if this is not a variable sized type, 1036 /// according to the rules of C99 6.7.5p3. It is not legal to call this on 1037 /// incomplete types. 1038 bool isConstantSizeType() const; 1039 1040 /// isSpecifierType - Returns true if this type can be represented by some 1041 /// set of type specifiers. 1042 bool isSpecifierType() const; 1043 1044 /// \brief Determine the linkage of this type. 1045 Linkage getLinkage() const; 1046 1047 /// \brief Note that the linkage is no longer known. 1048 void ClearLinkageCache(); 1049 1050 const char *getTypeClassName() const; 1051 1052 QualType getCanonicalTypeInternal() const { 1053 return CanonicalType; 1054 } 1055 CanQualType getCanonicalTypeUnqualified() const; // in CanonicalType.h 1056 void dump() const; 1057 static bool classof(const Type *) { return true; } 1058 1059 friend class ASTReader; 1060 friend class ASTWriter; 1061}; 1062 1063template <> inline const TypedefType *Type::getAs() const { 1064 return dyn_cast<TypedefType>(this); 1065} 1066 1067// We can do canonical leaf types faster, because we don't have to 1068// worry about preserving child type decoration. 1069#define TYPE(Class, Base) 1070#define LEAF_TYPE(Class) \ 1071template <> inline const Class##Type *Type::getAs() const { \ 1072 return dyn_cast<Class##Type>(CanonicalType); \ 1073} 1074#include "clang/AST/TypeNodes.def" 1075 1076 1077/// BuiltinType - This class is used for builtin types like 'int'. Builtin 1078/// types are always canonical and have a literal name field. 1079class BuiltinType : public Type { 1080public: 1081 enum Kind { 1082 Void, 1083 1084 Bool, // This is bool and/or _Bool. 1085 Char_U, // This is 'char' for targets where char is unsigned. 1086 UChar, // This is explicitly qualified unsigned char. 1087 Char16, // This is 'char16_t' for C++. 1088 Char32, // This is 'char32_t' for C++. 1089 UShort, 1090 UInt, 1091 ULong, 1092 ULongLong, 1093 UInt128, // __uint128_t 1094 1095 Char_S, // This is 'char' for targets where char is signed. 1096 SChar, // This is explicitly qualified signed char. 1097 WChar, // This is 'wchar_t' for C++. 1098 Short, 1099 Int, 1100 Long, 1101 LongLong, 1102 Int128, // __int128_t 1103 1104 Float, Double, LongDouble, 1105 1106 NullPtr, // This is the type of C++0x 'nullptr'. 1107 1108 Overload, // This represents the type of an overloaded function declaration. 1109 Dependent, // This represents the type of a type-dependent expression. 1110 1111 UndeducedAuto, // In C++0x, this represents the type of an auto variable 1112 // that has not been deduced yet. 1113 1114 /// The primitive Objective C 'id' type. The type pointed to by the 1115 /// user-visible 'id' type. Only ever shows up in an AST as the base 1116 /// type of an ObjCObjectType. 1117 ObjCId, 1118 1119 /// The primitive Objective C 'Class' type. The type pointed to by the 1120 /// user-visible 'Class' type. Only ever shows up in an AST as the 1121 /// base type of an ObjCObjectType. 1122 ObjCClass, 1123 1124 ObjCSel // This represents the ObjC 'SEL' type. 1125 }; 1126private: 1127 Kind TypeKind; 1128 1129protected: 1130 virtual Linkage getLinkageImpl() const; 1131 1132public: 1133 BuiltinType(Kind K) 1134 : Type(Builtin, QualType(), /*Dependent=*/(K == Dependent)), 1135 TypeKind(K) {} 1136 1137 Kind getKind() const { return TypeKind; } 1138 const char *getName(const LangOptions &LO) const; 1139 1140 bool isSugared() const { return false; } 1141 QualType desugar() const { return QualType(this, 0); } 1142 1143 bool isInteger() const { 1144 return TypeKind >= Bool && TypeKind <= Int128; 1145 } 1146 1147 bool isSignedInteger() const { 1148 return TypeKind >= Char_S && TypeKind <= Int128; 1149 } 1150 1151 bool isUnsignedInteger() const { 1152 return TypeKind >= Bool && TypeKind <= UInt128; 1153 } 1154 1155 bool isFloatingPoint() const { 1156 return TypeKind >= Float && TypeKind <= LongDouble; 1157 } 1158 1159 static bool classof(const Type *T) { return T->getTypeClass() == Builtin; } 1160 static bool classof(const BuiltinType *) { return true; } 1161}; 1162 1163/// ComplexType - C99 6.2.5p11 - Complex values. This supports the C99 complex 1164/// types (_Complex float etc) as well as the GCC integer complex extensions. 1165/// 1166class ComplexType : public Type, public llvm::FoldingSetNode { 1167 QualType ElementType; 1168 ComplexType(QualType Element, QualType CanonicalPtr) : 1169 Type(Complex, CanonicalPtr, Element->isDependentType()), 1170 ElementType(Element) { 1171 } 1172 friend class ASTContext; // ASTContext creates these. 1173 1174protected: 1175 virtual Linkage getLinkageImpl() const; 1176 1177public: 1178 QualType getElementType() const { return ElementType; } 1179 1180 bool isSugared() const { return false; } 1181 QualType desugar() const { return QualType(this, 0); } 1182 1183 void Profile(llvm::FoldingSetNodeID &ID) { 1184 Profile(ID, getElementType()); 1185 } 1186 static void Profile(llvm::FoldingSetNodeID &ID, QualType Element) { 1187 ID.AddPointer(Element.getAsOpaquePtr()); 1188 } 1189 1190 static bool classof(const Type *T) { return T->getTypeClass() == Complex; } 1191 static bool classof(const ComplexType *) { return true; } 1192}; 1193 1194/// PointerType - C99 6.7.5.1 - Pointer Declarators. 1195/// 1196class PointerType : public Type, public llvm::FoldingSetNode { 1197 QualType PointeeType; 1198 1199 PointerType(QualType Pointee, QualType CanonicalPtr) : 1200 Type(Pointer, CanonicalPtr, Pointee->isDependentType()), PointeeType(Pointee) { 1201 } 1202 friend class ASTContext; // ASTContext creates these. 1203 1204protected: 1205 virtual Linkage getLinkageImpl() const; 1206 1207public: 1208 1209 QualType getPointeeType() const { return PointeeType; } 1210 1211 bool isSugared() const { return false; } 1212 QualType desugar() const { return QualType(this, 0); } 1213 1214 void Profile(llvm::FoldingSetNodeID &ID) { 1215 Profile(ID, getPointeeType()); 1216 } 1217 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee) { 1218 ID.AddPointer(Pointee.getAsOpaquePtr()); 1219 } 1220 1221 static bool classof(const Type *T) { return T->getTypeClass() == Pointer; } 1222 static bool classof(const PointerType *) { return true; } 1223}; 1224 1225/// BlockPointerType - pointer to a block type. 1226/// This type is to represent types syntactically represented as 1227/// "void (^)(int)", etc. Pointee is required to always be a function type. 1228/// 1229class BlockPointerType : public Type, public llvm::FoldingSetNode { 1230 QualType PointeeType; // Block is some kind of pointer type 1231 BlockPointerType(QualType Pointee, QualType CanonicalCls) : 1232 Type(BlockPointer, CanonicalCls, Pointee->isDependentType()), 1233 PointeeType(Pointee) { 1234 } 1235 friend class ASTContext; // ASTContext creates these. 1236 1237protected: 1238 virtual Linkage getLinkageImpl() const; 1239 1240public: 1241 1242 // Get the pointee type. Pointee is required to always be a function type. 1243 QualType getPointeeType() const { return PointeeType; } 1244 1245 bool isSugared() const { return false; } 1246 QualType desugar() const { return QualType(this, 0); } 1247 1248 void Profile(llvm::FoldingSetNodeID &ID) { 1249 Profile(ID, getPointeeType()); 1250 } 1251 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee) { 1252 ID.AddPointer(Pointee.getAsOpaquePtr()); 1253 } 1254 1255 static bool classof(const Type *T) { 1256 return T->getTypeClass() == BlockPointer; 1257 } 1258 static bool classof(const BlockPointerType *) { return true; } 1259}; 1260 1261/// ReferenceType - Base for LValueReferenceType and RValueReferenceType 1262/// 1263class ReferenceType : public Type, public llvm::FoldingSetNode { 1264 QualType PointeeType; 1265 1266 /// True if the type was originally spelled with an lvalue sigil. 1267 /// This is never true of rvalue references but can also be false 1268 /// on lvalue references because of C++0x [dcl.typedef]p9, 1269 /// as follows: 1270 /// 1271 /// typedef int &ref; // lvalue, spelled lvalue 1272 /// typedef int &&rvref; // rvalue 1273 /// ref &a; // lvalue, inner ref, spelled lvalue 1274 /// ref &&a; // lvalue, inner ref 1275 /// rvref &a; // lvalue, inner ref, spelled lvalue 1276 /// rvref &&a; // rvalue, inner ref 1277 bool SpelledAsLValue; 1278 1279 /// True if the inner type is a reference type. This only happens 1280 /// in non-canonical forms. 1281 bool InnerRef; 1282 1283protected: 1284 ReferenceType(TypeClass tc, QualType Referencee, QualType CanonicalRef, 1285 bool SpelledAsLValue) : 1286 Type(tc, CanonicalRef, Referencee->isDependentType()), 1287 PointeeType(Referencee), SpelledAsLValue(SpelledAsLValue), 1288 InnerRef(Referencee->isReferenceType()) { 1289 } 1290 1291 virtual Linkage getLinkageImpl() const; 1292 1293public: 1294 bool isSpelledAsLValue() const { return SpelledAsLValue; } 1295 bool isInnerRef() const { return InnerRef; } 1296 1297 QualType getPointeeTypeAsWritten() const { return PointeeType; } 1298 QualType getPointeeType() const { 1299 // FIXME: this might strip inner qualifiers; okay? 1300 const ReferenceType *T = this; 1301 while (T->InnerRef) 1302 T = T->PointeeType->getAs<ReferenceType>(); 1303 return T->PointeeType; 1304 } 1305 1306 void Profile(llvm::FoldingSetNodeID &ID) { 1307 Profile(ID, PointeeType, SpelledAsLValue); 1308 } 1309 static void Profile(llvm::FoldingSetNodeID &ID, 1310 QualType Referencee, 1311 bool SpelledAsLValue) { 1312 ID.AddPointer(Referencee.getAsOpaquePtr()); 1313 ID.AddBoolean(SpelledAsLValue); 1314 } 1315 1316 static bool classof(const Type *T) { 1317 return T->getTypeClass() == LValueReference || 1318 T->getTypeClass() == RValueReference; 1319 } 1320 static bool classof(const ReferenceType *) { return true; } 1321}; 1322 1323/// LValueReferenceType - C++ [dcl.ref] - Lvalue reference 1324/// 1325class LValueReferenceType : public ReferenceType { 1326 LValueReferenceType(QualType Referencee, QualType CanonicalRef, 1327 bool SpelledAsLValue) : 1328 ReferenceType(LValueReference, Referencee, CanonicalRef, SpelledAsLValue) 1329 {} 1330 friend class ASTContext; // ASTContext creates these 1331public: 1332 bool isSugared() const { return false; } 1333 QualType desugar() const { return QualType(this, 0); } 1334 1335 static bool classof(const Type *T) { 1336 return T->getTypeClass() == LValueReference; 1337 } 1338 static bool classof(const LValueReferenceType *) { return true; } 1339}; 1340 1341/// RValueReferenceType - C++0x [dcl.ref] - Rvalue reference 1342/// 1343class RValueReferenceType : public ReferenceType { 1344 RValueReferenceType(QualType Referencee, QualType CanonicalRef) : 1345 ReferenceType(RValueReference, Referencee, CanonicalRef, false) { 1346 } 1347 friend class ASTContext; // ASTContext creates these 1348public: 1349 bool isSugared() const { return false; } 1350 QualType desugar() const { return QualType(this, 0); } 1351 1352 static bool classof(const Type *T) { 1353 return T->getTypeClass() == RValueReference; 1354 } 1355 static bool classof(const RValueReferenceType *) { return true; } 1356}; 1357 1358/// MemberPointerType - C++ 8.3.3 - Pointers to members 1359/// 1360class MemberPointerType : public Type, public llvm::FoldingSetNode { 1361 QualType PointeeType; 1362 /// The class of which the pointee is a member. Must ultimately be a 1363 /// RecordType, but could be a typedef or a template parameter too. 1364 const Type *Class; 1365 1366 MemberPointerType(QualType Pointee, const Type *Cls, QualType CanonicalPtr) : 1367 Type(MemberPointer, CanonicalPtr, 1368 Cls->isDependentType() || Pointee->isDependentType()), 1369 PointeeType(Pointee), Class(Cls) { 1370 } 1371 friend class ASTContext; // ASTContext creates these. 1372 1373protected: 1374 virtual Linkage getLinkageImpl() const; 1375 1376public: 1377 QualType getPointeeType() const { return PointeeType; } 1378 1379 /// Returns true if the member type (i.e. the pointee type) is a 1380 /// function type rather than a data-member type. 1381 bool isMemberFunctionPointer() const { 1382 return PointeeType->isFunctionProtoType(); 1383 } 1384 1385 /// Returns true if the member type (i.e. the pointee type) is a 1386 /// data type rather than a function type. 1387 bool isMemberDataPointer() const { 1388 return !PointeeType->isFunctionProtoType(); 1389 } 1390 1391 const Type *getClass() const { return Class; } 1392 1393 bool isSugared() const { return false; } 1394 QualType desugar() const { return QualType(this, 0); } 1395 1396 void Profile(llvm::FoldingSetNodeID &ID) { 1397 Profile(ID, getPointeeType(), getClass()); 1398 } 1399 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee, 1400 const Type *Class) { 1401 ID.AddPointer(Pointee.getAsOpaquePtr()); 1402 ID.AddPointer(Class); 1403 } 1404 1405 static bool classof(const Type *T) { 1406 return T->getTypeClass() == MemberPointer; 1407 } 1408 static bool classof(const MemberPointerType *) { return true; } 1409}; 1410 1411/// ArrayType - C99 6.7.5.2 - Array Declarators. 1412/// 1413class ArrayType : public Type, public llvm::FoldingSetNode { 1414public: 1415 /// ArraySizeModifier - Capture whether this is a normal array (e.g. int X[4]) 1416 /// an array with a static size (e.g. int X[static 4]), or an array 1417 /// with a star size (e.g. int X[*]). 1418 /// 'static' is only allowed on function parameters. 1419 enum ArraySizeModifier { 1420 Normal, Static, Star 1421 }; 1422private: 1423 /// ElementType - The element type of the array. 1424 QualType ElementType; 1425 1426 // NOTE: VC++ treats enums as signed, avoid using the ArraySizeModifier enum 1427 /// NOTE: These fields are packed into the bitfields space in the Type class. 1428 unsigned SizeModifier : 2; 1429 1430 /// IndexTypeQuals - Capture qualifiers in declarations like: 1431 /// 'int X[static restrict 4]'. For function parameters only. 1432 unsigned IndexTypeQuals : 3; 1433 1434protected: 1435 // C++ [temp.dep.type]p1: 1436 // A type is dependent if it is... 1437 // - an array type constructed from any dependent type or whose 1438 // size is specified by a constant expression that is 1439 // value-dependent, 1440 ArrayType(TypeClass tc, QualType et, QualType can, 1441 ArraySizeModifier sm, unsigned tq) 1442 : Type(tc, can, et->isDependentType() || tc == DependentSizedArray), 1443 ElementType(et), SizeModifier(sm), IndexTypeQuals(tq) {} 1444 1445 friend class ASTContext; // ASTContext creates these. 1446 1447 virtual Linkage getLinkageImpl() const; 1448 1449public: 1450 QualType getElementType() const { return ElementType; } 1451 ArraySizeModifier getSizeModifier() const { 1452 return ArraySizeModifier(SizeModifier); 1453 } 1454 Qualifiers getIndexTypeQualifiers() const { 1455 return Qualifiers::fromCVRMask(IndexTypeQuals); 1456 } 1457 unsigned getIndexTypeCVRQualifiers() const { return IndexTypeQuals; } 1458 1459 static bool classof(const Type *T) { 1460 return T->getTypeClass() == ConstantArray || 1461 T->getTypeClass() == VariableArray || 1462 T->getTypeClass() == IncompleteArray || 1463 T->getTypeClass() == DependentSizedArray; 1464 } 1465 static bool classof(const ArrayType *) { return true; } 1466}; 1467 1468/// ConstantArrayType - This class represents the canonical version of 1469/// C arrays with a specified constant size. For example, the canonical 1470/// type for 'int A[4 + 4*100]' is a ConstantArrayType where the element 1471/// type is 'int' and the size is 404. 1472class ConstantArrayType : public ArrayType { 1473 llvm::APInt Size; // Allows us to unique the type. 1474 1475 ConstantArrayType(QualType et, QualType can, const llvm::APInt &size, 1476 ArraySizeModifier sm, unsigned tq) 1477 : ArrayType(ConstantArray, et, can, sm, tq), 1478 Size(size) {} 1479protected: 1480 ConstantArrayType(TypeClass tc, QualType et, QualType can, 1481 const llvm::APInt &size, ArraySizeModifier sm, unsigned tq) 1482 : ArrayType(tc, et, can, sm, tq), Size(size) {} 1483 friend class ASTContext; // ASTContext creates these. 1484public: 1485 const llvm::APInt &getSize() const { return Size; } 1486 bool isSugared() const { return false; } 1487 QualType desugar() const { return QualType(this, 0); } 1488 1489 1490 /// \brief Determine the number of bits required to address a member of 1491 // an array with the given element type and number of elements. 1492 static unsigned getNumAddressingBits(ASTContext &Context, 1493 QualType ElementType, 1494 const llvm::APInt &NumElements); 1495 1496 /// \brief Determine the maximum number of active bits that an array's size 1497 /// can require, which limits the maximum size of the array. 1498 static unsigned getMaxSizeBits(ASTContext &Context); 1499 1500 void Profile(llvm::FoldingSetNodeID &ID) { 1501 Profile(ID, getElementType(), getSize(), 1502 getSizeModifier(), getIndexTypeCVRQualifiers()); 1503 } 1504 static void Profile(llvm::FoldingSetNodeID &ID, QualType ET, 1505 const llvm::APInt &ArraySize, ArraySizeModifier SizeMod, 1506 unsigned TypeQuals) { 1507 ID.AddPointer(ET.getAsOpaquePtr()); 1508 ID.AddInteger(ArraySize.getZExtValue()); 1509 ID.AddInteger(SizeMod); 1510 ID.AddInteger(TypeQuals); 1511 } 1512 static bool classof(const Type *T) { 1513 return T->getTypeClass() == ConstantArray; 1514 } 1515 static bool classof(const ConstantArrayType *) { return true; } 1516}; 1517 1518/// IncompleteArrayType - This class represents C arrays with an unspecified 1519/// size. For example 'int A[]' has an IncompleteArrayType where the element 1520/// type is 'int' and the size is unspecified. 1521class IncompleteArrayType : public ArrayType { 1522 1523 IncompleteArrayType(QualType et, QualType can, 1524 ArraySizeModifier sm, unsigned tq) 1525 : ArrayType(IncompleteArray, et, can, sm, tq) {} 1526 friend class ASTContext; // ASTContext creates these. 1527public: 1528 bool isSugared() const { return false; } 1529 QualType desugar() const { return QualType(this, 0); } 1530 1531 static bool classof(const Type *T) { 1532 return T->getTypeClass() == IncompleteArray; 1533 } 1534 static bool classof(const IncompleteArrayType *) { return true; } 1535 1536 friend class StmtIteratorBase; 1537 1538 void Profile(llvm::FoldingSetNodeID &ID) { 1539 Profile(ID, getElementType(), getSizeModifier(), 1540 getIndexTypeCVRQualifiers()); 1541 } 1542 1543 static void Profile(llvm::FoldingSetNodeID &ID, QualType ET, 1544 ArraySizeModifier SizeMod, unsigned TypeQuals) { 1545 ID.AddPointer(ET.getAsOpaquePtr()); 1546 ID.AddInteger(SizeMod); 1547 ID.AddInteger(TypeQuals); 1548 } 1549}; 1550 1551/// VariableArrayType - This class represents C arrays with a specified size 1552/// which is not an integer-constant-expression. For example, 'int s[x+foo()]'. 1553/// Since the size expression is an arbitrary expression, we store it as such. 1554/// 1555/// Note: VariableArrayType's aren't uniqued (since the expressions aren't) and 1556/// should not be: two lexically equivalent variable array types could mean 1557/// different things, for example, these variables do not have the same type 1558/// dynamically: 1559/// 1560/// void foo(int x) { 1561/// int Y[x]; 1562/// ++x; 1563/// int Z[x]; 1564/// } 1565/// 1566class VariableArrayType : public ArrayType { 1567 /// SizeExpr - An assignment expression. VLA's are only permitted within 1568 /// a function block. 1569 Stmt *SizeExpr; 1570 /// Brackets - The left and right array brackets. 1571 SourceRange Brackets; 1572 1573 VariableArrayType(QualType et, QualType can, Expr *e, 1574 ArraySizeModifier sm, unsigned tq, 1575 SourceRange brackets) 1576 : ArrayType(VariableArray, et, can, sm, tq), 1577 SizeExpr((Stmt*) e), Brackets(brackets) {} 1578 friend class ASTContext; // ASTContext creates these. 1579 1580public: 1581 Expr *getSizeExpr() const { 1582 // We use C-style casts instead of cast<> here because we do not wish 1583 // to have a dependency of Type.h on Stmt.h/Expr.h. 1584 return (Expr*) SizeExpr; 1585 } 1586 SourceRange getBracketsRange() const { return Brackets; } 1587 SourceLocation getLBracketLoc() const { return Brackets.getBegin(); } 1588 SourceLocation getRBracketLoc() const { return Brackets.getEnd(); } 1589 1590 bool isSugared() const { return false; } 1591 QualType desugar() const { return QualType(this, 0); } 1592 1593 static bool classof(const Type *T) { 1594 return T->getTypeClass() == VariableArray; 1595 } 1596 static bool classof(const VariableArrayType *) { return true; } 1597 1598 friend class StmtIteratorBase; 1599 1600 void Profile(llvm::FoldingSetNodeID &ID) { 1601 assert(0 && "Cannnot unique VariableArrayTypes."); 1602 } 1603}; 1604 1605/// DependentSizedArrayType - This type represents an array type in 1606/// C++ whose size is a value-dependent expression. For example: 1607/// 1608/// \code 1609/// template<typename T, int Size> 1610/// class array { 1611/// T data[Size]; 1612/// }; 1613/// \endcode 1614/// 1615/// For these types, we won't actually know what the array bound is 1616/// until template instantiation occurs, at which point this will 1617/// become either a ConstantArrayType or a VariableArrayType. 1618class DependentSizedArrayType : public ArrayType { 1619 ASTContext &Context; 1620 1621 /// \brief An assignment expression that will instantiate to the 1622 /// size of the array. 1623 /// 1624 /// The expression itself might be NULL, in which case the array 1625 /// type will have its size deduced from an initializer. 1626 Stmt *SizeExpr; 1627 1628 /// Brackets - The left and right array brackets. 1629 SourceRange Brackets; 1630 1631 DependentSizedArrayType(ASTContext &Context, QualType et, QualType can, 1632 Expr *e, ArraySizeModifier sm, unsigned tq, 1633 SourceRange brackets) 1634 : ArrayType(DependentSizedArray, et, can, sm, tq), 1635 Context(Context), SizeExpr((Stmt*) e), Brackets(brackets) {} 1636 friend class ASTContext; // ASTContext creates these. 1637 1638public: 1639 Expr *getSizeExpr() const { 1640 // We use C-style casts instead of cast<> here because we do not wish 1641 // to have a dependency of Type.h on Stmt.h/Expr.h. 1642 return (Expr*) SizeExpr; 1643 } 1644 SourceRange getBracketsRange() const { return Brackets; } 1645 SourceLocation getLBracketLoc() const { return Brackets.getBegin(); } 1646 SourceLocation getRBracketLoc() const { return Brackets.getEnd(); } 1647 1648 bool isSugared() const { return false; } 1649 QualType desugar() const { return QualType(this, 0); } 1650 1651 static bool classof(const Type *T) { 1652 return T->getTypeClass() == DependentSizedArray; 1653 } 1654 static bool classof(const DependentSizedArrayType *) { return true; } 1655 1656 friend class StmtIteratorBase; 1657 1658 1659 void Profile(llvm::FoldingSetNodeID &ID) { 1660 Profile(ID, Context, getElementType(), 1661 getSizeModifier(), getIndexTypeCVRQualifiers(), getSizeExpr()); 1662 } 1663 1664 static void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context, 1665 QualType ET, ArraySizeModifier SizeMod, 1666 unsigned TypeQuals, Expr *E); 1667}; 1668 1669/// DependentSizedExtVectorType - This type represent an extended vector type 1670/// where either the type or size is dependent. For example: 1671/// @code 1672/// template<typename T, int Size> 1673/// class vector { 1674/// typedef T __attribute__((ext_vector_type(Size))) type; 1675/// } 1676/// @endcode 1677class DependentSizedExtVectorType : public Type, public llvm::FoldingSetNode { 1678 ASTContext &Context; 1679 Expr *SizeExpr; 1680 /// ElementType - The element type of the array. 1681 QualType ElementType; 1682 SourceLocation loc; 1683 1684 DependentSizedExtVectorType(ASTContext &Context, QualType ElementType, 1685 QualType can, Expr *SizeExpr, SourceLocation loc) 1686 : Type (DependentSizedExtVector, can, true), 1687 Context(Context), SizeExpr(SizeExpr), ElementType(ElementType), 1688 loc(loc) {} 1689 friend class ASTContext; 1690 1691public: 1692 Expr *getSizeExpr() const { return SizeExpr; } 1693 QualType getElementType() const { return ElementType; } 1694 SourceLocation getAttributeLoc() const { return loc; } 1695 1696 bool isSugared() const { return false; } 1697 QualType desugar() const { return QualType(this, 0); } 1698 1699 static bool classof(const Type *T) { 1700 return T->getTypeClass() == DependentSizedExtVector; 1701 } 1702 static bool classof(const DependentSizedExtVectorType *) { return true; } 1703 1704 void Profile(llvm::FoldingSetNodeID &ID) { 1705 Profile(ID, Context, getElementType(), getSizeExpr()); 1706 } 1707 1708 static void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context, 1709 QualType ElementType, Expr *SizeExpr); 1710}; 1711 1712 1713/// VectorType - GCC generic vector type. This type is created using 1714/// __attribute__((vector_size(n)), where "n" specifies the vector size in 1715/// bytes; or from an Altivec __vector or vector declaration. 1716/// Since the constructor takes the number of vector elements, the 1717/// client is responsible for converting the size into the number of elements. 1718class VectorType : public Type, public llvm::FoldingSetNode { 1719public: 1720 enum AltiVecSpecific { 1721 NotAltiVec, // is not AltiVec vector 1722 AltiVec, // is AltiVec vector 1723 Pixel, // is AltiVec 'vector Pixel' 1724 Bool // is AltiVec 'vector bool ...' 1725 }; 1726protected: 1727 /// ElementType - The element type of the vector. 1728 QualType ElementType; 1729 1730 /// NumElements - The number of elements in the vector. 1731 unsigned NumElements; 1732 1733 AltiVecSpecific AltiVecSpec; 1734 1735 VectorType(QualType vecType, unsigned nElements, QualType canonType, 1736 AltiVecSpecific altiVecSpec) : 1737 Type(Vector, canonType, vecType->isDependentType()), 1738 ElementType(vecType), NumElements(nElements), AltiVecSpec(altiVecSpec) {} 1739 VectorType(TypeClass tc, QualType vecType, unsigned nElements, 1740 QualType canonType, AltiVecSpecific altiVecSpec) 1741 : Type(tc, canonType, vecType->isDependentType()), ElementType(vecType), 1742 NumElements(nElements), AltiVecSpec(altiVecSpec) {} 1743 friend class ASTContext; // ASTContext creates these. 1744 1745 virtual Linkage getLinkageImpl() const; 1746 1747public: 1748 1749 QualType getElementType() const { return ElementType; } 1750 unsigned getNumElements() const { return NumElements; } 1751 1752 bool isSugared() const { return false; } 1753 QualType desugar() const { return QualType(this, 0); } 1754 1755 AltiVecSpecific getAltiVecSpecific() const { return AltiVecSpec; } 1756 1757 void Profile(llvm::FoldingSetNodeID &ID) { 1758 Profile(ID, getElementType(), getNumElements(), getTypeClass(), AltiVecSpec); 1759 } 1760 static void Profile(llvm::FoldingSetNodeID &ID, QualType ElementType, 1761 unsigned NumElements, TypeClass TypeClass, 1762 unsigned AltiVecSpec) { 1763 ID.AddPointer(ElementType.getAsOpaquePtr()); 1764 ID.AddInteger(NumElements); 1765 ID.AddInteger(TypeClass); 1766 ID.AddInteger(AltiVecSpec); 1767 } 1768 1769 static bool classof(const Type *T) { 1770 return T->getTypeClass() == Vector || T->getTypeClass() == ExtVector; 1771 } 1772 static bool classof(const VectorType *) { return true; } 1773}; 1774 1775/// ExtVectorType - Extended vector type. This type is created using 1776/// __attribute__((ext_vector_type(n)), where "n" is the number of elements. 1777/// Unlike vector_size, ext_vector_type is only allowed on typedef's. This 1778/// class enables syntactic extensions, like Vector Components for accessing 1779/// points, colors, and textures (modeled after OpenGL Shading Language). 1780class ExtVectorType : public VectorType { 1781 ExtVectorType(QualType vecType, unsigned nElements, QualType canonType) : 1782 VectorType(ExtVector, vecType, nElements, canonType, NotAltiVec) {} 1783 friend class ASTContext; // ASTContext creates these. 1784public: 1785 static int getPointAccessorIdx(char c) { 1786 switch (c) { 1787 default: return -1; 1788 case 'x': return 0; 1789 case 'y': return 1; 1790 case 'z': return 2; 1791 case 'w': return 3; 1792 } 1793 } 1794 static int getNumericAccessorIdx(char c) { 1795 switch (c) { 1796 default: return -1; 1797 case '0': return 0; 1798 case '1': return 1; 1799 case '2': return 2; 1800 case '3': return 3; 1801 case '4': return 4; 1802 case '5': return 5; 1803 case '6': return 6; 1804 case '7': return 7; 1805 case '8': return 8; 1806 case '9': return 9; 1807 case 'A': 1808 case 'a': return 10; 1809 case 'B': 1810 case 'b': return 11; 1811 case 'C': 1812 case 'c': return 12; 1813 case 'D': 1814 case 'd': return 13; 1815 case 'E': 1816 case 'e': return 14; 1817 case 'F': 1818 case 'f': return 15; 1819 } 1820 } 1821 1822 static int getAccessorIdx(char c) { 1823 if (int idx = getPointAccessorIdx(c)+1) return idx-1; 1824 return getNumericAccessorIdx(c); 1825 } 1826 1827 bool isAccessorWithinNumElements(char c) const { 1828 if (int idx = getAccessorIdx(c)+1) 1829 return unsigned(idx-1) < NumElements; 1830 return false; 1831 } 1832 bool isSugared() const { return false; } 1833 QualType desugar() const { return QualType(this, 0); } 1834 1835 static bool classof(const Type *T) { 1836 return T->getTypeClass() == ExtVector; 1837 } 1838 static bool classof(const ExtVectorType *) { return true; } 1839}; 1840 1841/// FunctionType - C99 6.7.5.3 - Function Declarators. This is the common base 1842/// class of FunctionNoProtoType and FunctionProtoType. 1843/// 1844class FunctionType : public Type { 1845 virtual void ANCHOR(); // Key function for FunctionType. 1846 1847 /// SubClassData - This field is owned by the subclass, put here to pack 1848 /// tightly with the ivars in Type. 1849 bool SubClassData : 1; 1850 1851 /// TypeQuals - Used only by FunctionProtoType, put here to pack with the 1852 /// other bitfields. 1853 /// The qualifiers are part of FunctionProtoType because... 1854 /// 1855 /// C++ 8.3.5p4: The return type, the parameter type list and the 1856 /// cv-qualifier-seq, [...], are part of the function type. 1857 /// 1858 unsigned TypeQuals : 3; 1859 1860 /// NoReturn - Indicates if the function type is attribute noreturn. 1861 unsigned NoReturn : 1; 1862 1863 /// RegParm - How many arguments to pass inreg. 1864 unsigned RegParm : 3; 1865 1866 /// CallConv - The calling convention used by the function. 1867 unsigned CallConv : 3; 1868 1869 // The type returned by the function. 1870 QualType ResultType; 1871 1872 public: 1873 // This class is used for passing arround the information needed to 1874 // construct a call. It is not actually used for storage, just for 1875 // factoring together common arguments. 1876 // If you add a field (say Foo), other than the obvious places (both, constructors, 1877 // compile failures), what you need to update is 1878 // * Operetor== 1879 // * getFoo 1880 // * withFoo 1881 // * functionType. Add Foo, getFoo. 1882 // * ASTContext::getFooType 1883 // * ASTContext::mergeFunctionTypes 1884 // * FunctionNoProtoType::Profile 1885 // * FunctionProtoType::Profile 1886 // * TypePrinter::PrintFunctionProto 1887 // * AST read and write 1888 // * Codegen 1889 1890 class ExtInfo { 1891 public: 1892 // Constructor with no defaults. Use this when you know that you 1893 // have all the elements (when reading an AST file for example). 1894 ExtInfo(bool noReturn, unsigned regParm, CallingConv cc) : 1895 NoReturn(noReturn), RegParm(regParm), CC(cc) {} 1896 1897 // Constructor with all defaults. Use when for example creating a 1898 // function know to use defaults. 1899 ExtInfo() : NoReturn(false), RegParm(0), CC(CC_Default) {} 1900 1901 bool getNoReturn() const { return NoReturn; } 1902 unsigned getRegParm() const { return RegParm; } 1903 CallingConv getCC() const { return CC; } 1904 1905 bool operator==(const ExtInfo &Other) const { 1906 return getNoReturn() == Other.getNoReturn() && 1907 getRegParm() == Other.getRegParm() && 1908 getCC() == Other.getCC(); 1909 } 1910 bool operator!=(const ExtInfo &Other) const { 1911 return !(*this == Other); 1912 } 1913 1914 // Note that we don't have setters. That is by design, use 1915 // the following with methods instead of mutating these objects. 1916 1917 ExtInfo withNoReturn(bool noReturn) const { 1918 return ExtInfo(noReturn, getRegParm(), getCC()); 1919 } 1920 1921 ExtInfo withRegParm(unsigned RegParm) const { 1922 return ExtInfo(getNoReturn(), RegParm, getCC()); 1923 } 1924 1925 ExtInfo withCallingConv(CallingConv cc) const { 1926 return ExtInfo(getNoReturn(), getRegParm(), cc); 1927 } 1928 1929 private: 1930 // True if we have __attribute__((noreturn)) 1931 bool NoReturn; 1932 // The value passed to __attribute__((regparm(x))) 1933 unsigned RegParm; 1934 // The calling convention as specified via 1935 // __attribute__((cdecl|stdcall|fastcall|thiscall|pascal)) 1936 CallingConv CC; 1937 }; 1938 1939protected: 1940 FunctionType(TypeClass tc, QualType res, bool SubclassInfo, 1941 unsigned typeQuals, QualType Canonical, bool Dependent, 1942 const ExtInfo &Info) 1943 : Type(tc, Canonical, Dependent), 1944 SubClassData(SubclassInfo), TypeQuals(typeQuals), 1945 NoReturn(Info.getNoReturn()), 1946 RegParm(Info.getRegParm()), CallConv(Info.getCC()), ResultType(res) {} 1947 bool getSubClassData() const { return SubClassData; } 1948 unsigned getTypeQuals() const { return TypeQuals; } 1949public: 1950 1951 QualType getResultType() const { return ResultType; } 1952 1953 unsigned getRegParmType() const { return RegParm; } 1954 bool getNoReturnAttr() const { return NoReturn; } 1955 CallingConv getCallConv() const { return (CallingConv)CallConv; } 1956 ExtInfo getExtInfo() const { 1957 return ExtInfo(NoReturn, RegParm, (CallingConv)CallConv); 1958 } 1959 1960 /// \brief Determine the type of an expression that calls a function of 1961 /// this type. 1962 QualType getCallResultType(ASTContext &Context) const { 1963 return getResultType().getNonLValueExprType(Context); 1964 } 1965 1966 static llvm::StringRef getNameForCallConv(CallingConv CC); 1967 1968 static bool classof(const Type *T) { 1969 return T->getTypeClass() == FunctionNoProto || 1970 T->getTypeClass() == FunctionProto; 1971 } 1972 static bool classof(const FunctionType *) { return true; } 1973}; 1974 1975/// FunctionNoProtoType - Represents a K&R-style 'int foo()' function, which has 1976/// no information available about its arguments. 1977class FunctionNoProtoType : public FunctionType, public llvm::FoldingSetNode { 1978 FunctionNoProtoType(QualType Result, QualType Canonical, 1979 const ExtInfo &Info) 1980 : FunctionType(FunctionNoProto, Result, false, 0, Canonical, 1981 /*Dependent=*/false, Info) {} 1982 friend class ASTContext; // ASTContext creates these. 1983 1984protected: 1985 virtual Linkage getLinkageImpl() const; 1986 1987public: 1988 // No additional state past what FunctionType provides. 1989 1990 bool isSugared() const { return false; } 1991 QualType desugar() const { return QualType(this, 0); } 1992 1993 void Profile(llvm::FoldingSetNodeID &ID) { 1994 Profile(ID, getResultType(), getExtInfo()); 1995 } 1996 static void Profile(llvm::FoldingSetNodeID &ID, QualType ResultType, 1997 const ExtInfo &Info) { 1998 ID.AddInteger(Info.getCC()); 1999 ID.AddInteger(Info.getRegParm()); 2000 ID.AddInteger(Info.getNoReturn()); 2001 ID.AddPointer(ResultType.getAsOpaquePtr()); 2002 } 2003 2004 static bool classof(const Type *T) { 2005 return T->getTypeClass() == FunctionNoProto; 2006 } 2007 static bool classof(const FunctionNoProtoType *) { return true; } 2008}; 2009 2010/// FunctionProtoType - Represents a prototype with argument type info, e.g. 2011/// 'int foo(int)' or 'int foo(void)'. 'void' is represented as having no 2012/// arguments, not as having a single void argument. Such a type can have an 2013/// exception specification, but this specification is not part of the canonical 2014/// type. 2015class FunctionProtoType : public FunctionType, public llvm::FoldingSetNode { 2016 /// hasAnyDependentType - Determine whether there are any dependent 2017 /// types within the arguments passed in. 2018 static bool hasAnyDependentType(const QualType *ArgArray, unsigned numArgs) { 2019 for (unsigned Idx = 0; Idx < numArgs; ++Idx) 2020 if (ArgArray[Idx]->isDependentType()) 2021 return true; 2022 2023 return false; 2024 } 2025 2026 FunctionProtoType(QualType Result, const QualType *ArgArray, unsigned numArgs, 2027 bool isVariadic, unsigned typeQuals, bool hasExs, 2028 bool hasAnyExs, const QualType *ExArray, 2029 unsigned numExs, QualType Canonical, 2030 const ExtInfo &Info) 2031 : FunctionType(FunctionProto, Result, isVariadic, typeQuals, Canonical, 2032 (Result->isDependentType() || 2033 hasAnyDependentType(ArgArray, numArgs)), 2034 Info), 2035 NumArgs(numArgs), NumExceptions(numExs), HasExceptionSpec(hasExs), 2036 AnyExceptionSpec(hasAnyExs) { 2037 // Fill in the trailing argument array. 2038 QualType *ArgInfo = reinterpret_cast<QualType*>(this+1); 2039 for (unsigned i = 0; i != numArgs; ++i) 2040 ArgInfo[i] = ArgArray[i]; 2041 // Fill in the exception array. 2042 QualType *Ex = ArgInfo + numArgs; 2043 for (unsigned i = 0; i != numExs; ++i) 2044 Ex[i] = ExArray[i]; 2045 } 2046 2047 /// NumArgs - The number of arguments this function has, not counting '...'. 2048 unsigned NumArgs : 20; 2049 2050 /// NumExceptions - The number of types in the exception spec, if any. 2051 unsigned NumExceptions : 10; 2052 2053 /// HasExceptionSpec - Whether this function has an exception spec at all. 2054 bool HasExceptionSpec : 1; 2055 2056 /// AnyExceptionSpec - Whether this function has a throw(...) spec. 2057 bool AnyExceptionSpec : 1; 2058 2059 /// ArgInfo - There is an variable size array after the class in memory that 2060 /// holds the argument types. 2061 2062 /// Exceptions - There is another variable size array after ArgInfo that 2063 /// holds the exception types. 2064 2065 friend class ASTContext; // ASTContext creates these. 2066 2067protected: 2068 virtual Linkage getLinkageImpl() const; 2069 2070public: 2071 unsigned getNumArgs() const { return NumArgs; } 2072 QualType getArgType(unsigned i) const { 2073 assert(i < NumArgs && "Invalid argument number!"); 2074 return arg_type_begin()[i]; 2075 } 2076 2077 bool hasExceptionSpec() const { return HasExceptionSpec; } 2078 bool hasAnyExceptionSpec() const { return AnyExceptionSpec; } 2079 unsigned getNumExceptions() const { return NumExceptions; } 2080 QualType getExceptionType(unsigned i) const { 2081 assert(i < NumExceptions && "Invalid exception number!"); 2082 return exception_begin()[i]; 2083 } 2084 bool hasEmptyExceptionSpec() const { 2085 return hasExceptionSpec() && !hasAnyExceptionSpec() && 2086 getNumExceptions() == 0; 2087 } 2088 2089 bool isVariadic() const { return getSubClassData(); } 2090 unsigned getTypeQuals() const { return FunctionType::getTypeQuals(); } 2091 2092 typedef const QualType *arg_type_iterator; 2093 arg_type_iterator arg_type_begin() const { 2094 return reinterpret_cast<const QualType *>(this+1); 2095 } 2096 arg_type_iterator arg_type_end() const { return arg_type_begin()+NumArgs; } 2097 2098 typedef const QualType *exception_iterator; 2099 exception_iterator exception_begin() const { 2100 // exceptions begin where arguments end 2101 return arg_type_end(); 2102 } 2103 exception_iterator exception_end() const { 2104 return exception_begin() + NumExceptions; 2105 } 2106 2107 bool isSugared() const { return false; } 2108 QualType desugar() const { return QualType(this, 0); } 2109 2110 static bool classof(const Type *T) { 2111 return T->getTypeClass() == FunctionProto; 2112 } 2113 static bool classof(const FunctionProtoType *) { return true; } 2114 2115 void Profile(llvm::FoldingSetNodeID &ID); 2116 static void Profile(llvm::FoldingSetNodeID &ID, QualType Result, 2117 arg_type_iterator ArgTys, unsigned NumArgs, 2118 bool isVariadic, unsigned TypeQuals, 2119 bool hasExceptionSpec, bool anyExceptionSpec, 2120 unsigned NumExceptions, exception_iterator Exs, 2121 const ExtInfo &ExtInfo); 2122}; 2123 2124 2125/// \brief Represents the dependent type named by a dependently-scoped 2126/// typename using declaration, e.g. 2127/// using typename Base<T>::foo; 2128/// Template instantiation turns these into the underlying type. 2129class UnresolvedUsingType : public Type { 2130 UnresolvedUsingTypenameDecl *Decl; 2131 2132 UnresolvedUsingType(const UnresolvedUsingTypenameDecl *D) 2133 : Type(UnresolvedUsing, QualType(), true), 2134 Decl(const_cast<UnresolvedUsingTypenameDecl*>(D)) {} 2135 friend class ASTContext; // ASTContext creates these. 2136public: 2137 2138 UnresolvedUsingTypenameDecl *getDecl() const { return Decl; } 2139 2140 bool isSugared() const { return false; } 2141 QualType desugar() const { return QualType(this, 0); } 2142 2143 static bool classof(const Type *T) { 2144 return T->getTypeClass() == UnresolvedUsing; 2145 } 2146 static bool classof(const UnresolvedUsingType *) { return true; } 2147 2148 void Profile(llvm::FoldingSetNodeID &ID) { 2149 return Profile(ID, Decl); 2150 } 2151 static void Profile(llvm::FoldingSetNodeID &ID, 2152 UnresolvedUsingTypenameDecl *D) { 2153 ID.AddPointer(D); 2154 } 2155}; 2156 2157 2158class TypedefType : public Type { 2159 TypedefDecl *Decl; 2160protected: 2161 TypedefType(TypeClass tc, const TypedefDecl *D, QualType can) 2162 : Type(tc, can, can->isDependentType()), 2163 Decl(const_cast<TypedefDecl*>(D)) { 2164 assert(!isa<TypedefType>(can) && "Invalid canonical type"); 2165 } 2166 friend class ASTContext; // ASTContext creates these. 2167public: 2168 2169 TypedefDecl *getDecl() const { return Decl; } 2170 2171 /// LookThroughTypedefs - Return the ultimate type this typedef corresponds to 2172 /// potentially looking through *all* consecutive typedefs. This returns the 2173 /// sum of the type qualifiers, so if you have: 2174 /// typedef const int A; 2175 /// typedef volatile A B; 2176 /// looking through the typedefs for B will give you "const volatile A". 2177 QualType LookThroughTypedefs() const; 2178 2179 bool isSugared() const { return true; } 2180 QualType desugar() const; 2181 2182 static bool classof(const Type *T) { return T->getTypeClass() == Typedef; } 2183 static bool classof(const TypedefType *) { return true; } 2184}; 2185 2186/// TypeOfExprType (GCC extension). 2187class TypeOfExprType : public Type { 2188 Expr *TOExpr; 2189 2190protected: 2191 TypeOfExprType(Expr *E, QualType can = QualType()); 2192 friend class ASTContext; // ASTContext creates these. 2193public: 2194 Expr *getUnderlyingExpr() const { return TOExpr; } 2195 2196 /// \brief Remove a single level of sugar. 2197 QualType desugar() const; 2198 2199 /// \brief Returns whether this type directly provides sugar. 2200 bool isSugared() const { return true; } 2201 2202 static bool classof(const Type *T) { return T->getTypeClass() == TypeOfExpr; } 2203 static bool classof(const TypeOfExprType *) { return true; } 2204}; 2205 2206/// \brief Internal representation of canonical, dependent 2207/// typeof(expr) types. 2208/// 2209/// This class is used internally by the ASTContext to manage 2210/// canonical, dependent types, only. Clients will only see instances 2211/// of this class via TypeOfExprType nodes. 2212class DependentTypeOfExprType 2213 : public TypeOfExprType, public llvm::FoldingSetNode { 2214 ASTContext &Context; 2215 2216public: 2217 DependentTypeOfExprType(ASTContext &Context, Expr *E) 2218 : TypeOfExprType(E), Context(Context) { } 2219 2220 bool isSugared() const { return false; } 2221 QualType desugar() const { return QualType(this, 0); } 2222 2223 void Profile(llvm::FoldingSetNodeID &ID) { 2224 Profile(ID, Context, getUnderlyingExpr()); 2225 } 2226 2227 static void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context, 2228 Expr *E); 2229}; 2230 2231/// TypeOfType (GCC extension). 2232class TypeOfType : public Type { 2233 QualType TOType; 2234 TypeOfType(QualType T, QualType can) 2235 : Type(TypeOf, can, T->isDependentType()), TOType(T) { 2236 assert(!isa<TypedefType>(can) && "Invalid canonical type"); 2237 } 2238 friend class ASTContext; // ASTContext creates these. 2239public: 2240 QualType getUnderlyingType() const { return TOType; } 2241 2242 /// \brief Remove a single level of sugar. 2243 QualType desugar() const { return getUnderlyingType(); } 2244 2245 /// \brief Returns whether this type directly provides sugar. 2246 bool isSugared() const { return true; } 2247 2248 static bool classof(const Type *T) { return T->getTypeClass() == TypeOf; } 2249 static bool classof(const TypeOfType *) { return true; } 2250}; 2251 2252/// DecltypeType (C++0x) 2253class DecltypeType : public Type { 2254 Expr *E; 2255 2256 // FIXME: We could get rid of UnderlyingType if we wanted to: We would have to 2257 // Move getDesugaredType to ASTContext so that it can call getDecltypeForExpr 2258 // from it. 2259 QualType UnderlyingType; 2260 2261protected: 2262 DecltypeType(Expr *E, QualType underlyingType, QualType can = QualType()); 2263 friend class ASTContext; // ASTContext creates these. 2264public: 2265 Expr *getUnderlyingExpr() const { return E; } 2266 QualType getUnderlyingType() const { return UnderlyingType; } 2267 2268 /// \brief Remove a single level of sugar. 2269 QualType desugar() const { return getUnderlyingType(); } 2270 2271 /// \brief Returns whether this type directly provides sugar. 2272 bool isSugared() const { return !isDependentType(); } 2273 2274 static bool classof(const Type *T) { return T->getTypeClass() == Decltype; } 2275 static bool classof(const DecltypeType *) { return true; } 2276}; 2277 2278/// \brief Internal representation of canonical, dependent 2279/// decltype(expr) types. 2280/// 2281/// This class is used internally by the ASTContext to manage 2282/// canonical, dependent types, only. Clients will only see instances 2283/// of this class via DecltypeType nodes. 2284class DependentDecltypeType : public DecltypeType, public llvm::FoldingSetNode { 2285 ASTContext &Context; 2286 2287public: 2288 DependentDecltypeType(ASTContext &Context, Expr *E); 2289 2290 bool isSugared() const { return false; } 2291 QualType desugar() const { return QualType(this, 0); } 2292 2293 void Profile(llvm::FoldingSetNodeID &ID) { 2294 Profile(ID, Context, getUnderlyingExpr()); 2295 } 2296 2297 static void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context, 2298 Expr *E); 2299}; 2300 2301class TagType : public Type { 2302 /// Stores the TagDecl associated with this type. The decl may point to any 2303 /// TagDecl that declares the entity. 2304 TagDecl * decl; 2305 2306protected: 2307 TagType(TypeClass TC, const TagDecl *D, QualType can); 2308 2309 virtual Linkage getLinkageImpl() const; 2310 2311public: 2312 TagDecl *getDecl() const; 2313 2314 /// @brief Determines whether this type is in the process of being 2315 /// defined. 2316 bool isBeingDefined() const; 2317 2318 static bool classof(const Type *T) { 2319 return T->getTypeClass() >= TagFirst && T->getTypeClass() <= TagLast; 2320 } 2321 static bool classof(const TagType *) { return true; } 2322 static bool classof(const RecordType *) { return true; } 2323 static bool classof(const EnumType *) { return true; } 2324}; 2325 2326/// RecordType - This is a helper class that allows the use of isa/cast/dyncast 2327/// to detect TagType objects of structs/unions/classes. 2328class RecordType : public TagType { 2329protected: 2330 explicit RecordType(const RecordDecl *D) 2331 : TagType(Record, reinterpret_cast<const TagDecl*>(D), QualType()) { } 2332 explicit RecordType(TypeClass TC, RecordDecl *D) 2333 : TagType(TC, reinterpret_cast<const TagDecl*>(D), QualType()) { } 2334 friend class ASTContext; // ASTContext creates these. 2335public: 2336 2337 RecordDecl *getDecl() const { 2338 return reinterpret_cast<RecordDecl*>(TagType::getDecl()); 2339 } 2340 2341 // FIXME: This predicate is a helper to QualType/Type. It needs to 2342 // recursively check all fields for const-ness. If any field is declared 2343 // const, it needs to return false. 2344 bool hasConstFields() const { return false; } 2345 2346 // FIXME: RecordType needs to check when it is created that all fields are in 2347 // the same address space, and return that. 2348 unsigned getAddressSpace() const { return 0; } 2349 2350 bool isSugared() const { return false; } 2351 QualType desugar() const { return QualType(this, 0); } 2352 2353 static bool classof(const TagType *T); 2354 static bool classof(const Type *T) { 2355 return isa<TagType>(T) && classof(cast<TagType>(T)); 2356 } 2357 static bool classof(const RecordType *) { return true; } 2358}; 2359 2360/// EnumType - This is a helper class that allows the use of isa/cast/dyncast 2361/// to detect TagType objects of enums. 2362class EnumType : public TagType { 2363 explicit EnumType(const EnumDecl *D) 2364 : TagType(Enum, reinterpret_cast<const TagDecl*>(D), QualType()) { } 2365 friend class ASTContext; // ASTContext creates these. 2366public: 2367 2368 EnumDecl *getDecl() const { 2369 return reinterpret_cast<EnumDecl*>(TagType::getDecl()); 2370 } 2371 2372 bool isSugared() const { return false; } 2373 QualType desugar() const { return QualType(this, 0); } 2374 2375 static bool classof(const TagType *T); 2376 static bool classof(const Type *T) { 2377 return isa<TagType>(T) && classof(cast<TagType>(T)); 2378 } 2379 static bool classof(const EnumType *) { return true; } 2380}; 2381 2382class TemplateTypeParmType : public Type, public llvm::FoldingSetNode { 2383 unsigned Depth : 15; 2384 unsigned Index : 16; 2385 unsigned ParameterPack : 1; 2386 IdentifierInfo *Name; 2387 2388 TemplateTypeParmType(unsigned D, unsigned I, bool PP, IdentifierInfo *N, 2389 QualType Canon) 2390 : Type(TemplateTypeParm, Canon, /*Dependent=*/true), 2391 Depth(D), Index(I), ParameterPack(PP), Name(N) { } 2392 2393 TemplateTypeParmType(unsigned D, unsigned I, bool PP) 2394 : Type(TemplateTypeParm, QualType(this, 0), /*Dependent=*/true), 2395 Depth(D), Index(I), ParameterPack(PP), Name(0) { } 2396 2397 friend class ASTContext; // ASTContext creates these 2398 2399public: 2400 unsigned getDepth() const { return Depth; } 2401 unsigned getIndex() const { return Index; } 2402 bool isParameterPack() const { return ParameterPack; } 2403 IdentifierInfo *getName() const { return Name; } 2404 2405 bool isSugared() const { return false; } 2406 QualType desugar() const { return QualType(this, 0); } 2407 2408 void Profile(llvm::FoldingSetNodeID &ID) { 2409 Profile(ID, Depth, Index, ParameterPack, Name); 2410 } 2411 2412 static void Profile(llvm::FoldingSetNodeID &ID, unsigned Depth, 2413 unsigned Index, bool ParameterPack, 2414 IdentifierInfo *Name) { 2415 ID.AddInteger(Depth); 2416 ID.AddInteger(Index); 2417 ID.AddBoolean(ParameterPack); 2418 ID.AddPointer(Name); 2419 } 2420 2421 static bool classof(const Type *T) { 2422 return T->getTypeClass() == TemplateTypeParm; 2423 } 2424 static bool classof(const TemplateTypeParmType *T) { return true; } 2425}; 2426 2427/// \brief Represents the result of substituting a type for a template 2428/// type parameter. 2429/// 2430/// Within an instantiated template, all template type parameters have 2431/// been replaced with these. They are used solely to record that a 2432/// type was originally written as a template type parameter; 2433/// therefore they are never canonical. 2434class SubstTemplateTypeParmType : public Type, public llvm::FoldingSetNode { 2435 // The original type parameter. 2436 const TemplateTypeParmType *Replaced; 2437 2438 SubstTemplateTypeParmType(const TemplateTypeParmType *Param, QualType Canon) 2439 : Type(SubstTemplateTypeParm, Canon, Canon->isDependentType()), 2440 Replaced(Param) { } 2441 2442 friend class ASTContext; 2443 2444public: 2445 IdentifierInfo *getName() const { return Replaced->getName(); } 2446 2447 /// Gets the template parameter that was substituted for. 2448 const TemplateTypeParmType *getReplacedParameter() const { 2449 return Replaced; 2450 } 2451 2452 /// Gets the type that was substituted for the template 2453 /// parameter. 2454 QualType getReplacementType() const { 2455 return getCanonicalTypeInternal(); 2456 } 2457 2458 bool isSugared() const { return true; } 2459 QualType desugar() const { return getReplacementType(); } 2460 2461 void Profile(llvm::FoldingSetNodeID &ID) { 2462 Profile(ID, getReplacedParameter(), getReplacementType()); 2463 } 2464 static void Profile(llvm::FoldingSetNodeID &ID, 2465 const TemplateTypeParmType *Replaced, 2466 QualType Replacement) { 2467 ID.AddPointer(Replaced); 2468 ID.AddPointer(Replacement.getAsOpaquePtr()); 2469 } 2470 2471 static bool classof(const Type *T) { 2472 return T->getTypeClass() == SubstTemplateTypeParm; 2473 } 2474 static bool classof(const SubstTemplateTypeParmType *T) { return true; } 2475}; 2476 2477/// \brief Represents the type of a template specialization as written 2478/// in the source code. 2479/// 2480/// Template specialization types represent the syntactic form of a 2481/// template-id that refers to a type, e.g., @c vector<int>. Some 2482/// template specialization types are syntactic sugar, whose canonical 2483/// type will point to some other type node that represents the 2484/// instantiation or class template specialization. For example, a 2485/// class template specialization type of @c vector<int> will refer to 2486/// a tag type for the instantiation 2487/// @c std::vector<int, std::allocator<int>>. 2488/// 2489/// Other template specialization types, for which the template name 2490/// is dependent, may be canonical types. These types are always 2491/// dependent. 2492class TemplateSpecializationType 2493 : public Type, public llvm::FoldingSetNode { 2494 /// \brief The name of the template being specialized. 2495 TemplateName Template; 2496 2497 /// \brief - The number of template arguments named in this class 2498 /// template specialization. 2499 unsigned NumArgs; 2500 2501 TemplateSpecializationType(TemplateName T, 2502 const TemplateArgument *Args, 2503 unsigned NumArgs, QualType Canon); 2504 2505 friend class ASTContext; // ASTContext creates these 2506 2507public: 2508 /// \brief Determine whether any of the given template arguments are 2509 /// dependent. 2510 static bool anyDependentTemplateArguments(const TemplateArgument *Args, 2511 unsigned NumArgs); 2512 2513 static bool anyDependentTemplateArguments(const TemplateArgumentLoc *Args, 2514 unsigned NumArgs); 2515 2516 static bool anyDependentTemplateArguments(const TemplateArgumentListInfo &); 2517 2518 /// \brief Print a template argument list, including the '<' and '>' 2519 /// enclosing the template arguments. 2520 static std::string PrintTemplateArgumentList(const TemplateArgument *Args, 2521 unsigned NumArgs, 2522 const PrintingPolicy &Policy); 2523 2524 static std::string PrintTemplateArgumentList(const TemplateArgumentLoc *Args, 2525 unsigned NumArgs, 2526 const PrintingPolicy &Policy); 2527 2528 static std::string PrintTemplateArgumentList(const TemplateArgumentListInfo &, 2529 const PrintingPolicy &Policy); 2530 2531 /// True if this template specialization type matches a current 2532 /// instantiation in the context in which it is found. 2533 bool isCurrentInstantiation() const { 2534 return isa<InjectedClassNameType>(getCanonicalTypeInternal()); 2535 } 2536 2537 typedef const TemplateArgument * iterator; 2538 2539 iterator begin() const { return getArgs(); } 2540 iterator end() const; // defined inline in TemplateBase.h 2541 2542 /// \brief Retrieve the name of the template that we are specializing. 2543 TemplateName getTemplateName() const { return Template; } 2544 2545 /// \brief Retrieve the template arguments. 2546 const TemplateArgument *getArgs() const { 2547 return reinterpret_cast<const TemplateArgument *>(this + 1); 2548 } 2549 2550 /// \brief Retrieve the number of template arguments. 2551 unsigned getNumArgs() const { return NumArgs; } 2552 2553 /// \brief Retrieve a specific template argument as a type. 2554 /// \precondition @c isArgType(Arg) 2555 const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h 2556 2557 bool isSugared() const { 2558 return !isDependentType() || isCurrentInstantiation(); 2559 } 2560 QualType desugar() const { return getCanonicalTypeInternal(); } 2561 2562 void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Ctx) { 2563 Profile(ID, Template, getArgs(), NumArgs, Ctx); 2564 } 2565 2566 static void Profile(llvm::FoldingSetNodeID &ID, TemplateName T, 2567 const TemplateArgument *Args, 2568 unsigned NumArgs, 2569 ASTContext &Context); 2570 2571 static bool classof(const Type *T) { 2572 return T->getTypeClass() == TemplateSpecialization; 2573 } 2574 static bool classof(const TemplateSpecializationType *T) { return true; } 2575}; 2576 2577/// \brief The injected class name of a C++ class template or class 2578/// template partial specialization. Used to record that a type was 2579/// spelled with a bare identifier rather than as a template-id; the 2580/// equivalent for non-templated classes is just RecordType. 2581/// 2582/// Injected class name types are always dependent. Template 2583/// instantiation turns these into RecordTypes. 2584/// 2585/// Injected class name types are always canonical. This works 2586/// because it is impossible to compare an injected class name type 2587/// with the corresponding non-injected template type, for the same 2588/// reason that it is impossible to directly compare template 2589/// parameters from different dependent contexts: injected class name 2590/// types can only occur within the scope of a particular templated 2591/// declaration, and within that scope every template specialization 2592/// will canonicalize to the injected class name (when appropriate 2593/// according to the rules of the language). 2594class InjectedClassNameType : public Type { 2595 CXXRecordDecl *Decl; 2596 2597 /// The template specialization which this type represents. 2598 /// For example, in 2599 /// template <class T> class A { ... }; 2600 /// this is A<T>, whereas in 2601 /// template <class X, class Y> class A<B<X,Y> > { ... }; 2602 /// this is A<B<X,Y> >. 2603 /// 2604 /// It is always unqualified, always a template specialization type, 2605 /// and always dependent. 2606 QualType InjectedType; 2607 2608 friend class ASTContext; // ASTContext creates these. 2609 friend class ASTReader; // FIXME: ASTContext::getInjectedClassNameType is not 2610 // currently suitable for AST reading, too much 2611 // interdependencies. 2612 InjectedClassNameType(CXXRecordDecl *D, QualType TST) 2613 : Type(InjectedClassName, QualType(), true), 2614 Decl(D), InjectedType(TST) { 2615 assert(isa<TemplateSpecializationType>(TST)); 2616 assert(!TST.hasQualifiers()); 2617 assert(TST->isDependentType()); 2618 } 2619 2620public: 2621 QualType getInjectedSpecializationType() const { return InjectedType; } 2622 const TemplateSpecializationType *getInjectedTST() const { 2623 return cast<TemplateSpecializationType>(InjectedType.getTypePtr()); 2624 } 2625 2626 CXXRecordDecl *getDecl() const; 2627 2628 bool isSugared() const { return false; } 2629 QualType desugar() const { return QualType(this, 0); } 2630 2631 static bool classof(const Type *T) { 2632 return T->getTypeClass() == InjectedClassName; 2633 } 2634 static bool classof(const InjectedClassNameType *T) { return true; } 2635}; 2636 2637/// \brief The kind of a tag type. 2638enum TagTypeKind { 2639 /// \brief The "struct" keyword. 2640 TTK_Struct, 2641 /// \brief The "union" keyword. 2642 TTK_Union, 2643 /// \brief The "class" keyword. 2644 TTK_Class, 2645 /// \brief The "enum" keyword. 2646 TTK_Enum 2647}; 2648 2649/// \brief The elaboration keyword that precedes a qualified type name or 2650/// introduces an elaborated-type-specifier. 2651enum ElaboratedTypeKeyword { 2652 /// \brief The "struct" keyword introduces the elaborated-type-specifier. 2653 ETK_Struct, 2654 /// \brief The "union" keyword introduces the elaborated-type-specifier. 2655 ETK_Union, 2656 /// \brief The "class" keyword introduces the elaborated-type-specifier. 2657 ETK_Class, 2658 /// \brief The "enum" keyword introduces the elaborated-type-specifier. 2659 ETK_Enum, 2660 /// \brief The "typename" keyword precedes the qualified type name, e.g., 2661 /// \c typename T::type. 2662 ETK_Typename, 2663 /// \brief No keyword precedes the qualified type name. 2664 ETK_None 2665}; 2666 2667/// A helper class for Type nodes having an ElaboratedTypeKeyword. 2668/// The keyword in stored in the free bits of the base class. 2669/// Also provides a few static helpers for converting and printing 2670/// elaborated type keyword and tag type kind enumerations. 2671class TypeWithKeyword : public Type { 2672 /// Keyword - Encodes an ElaboratedTypeKeyword enumeration constant. 2673 unsigned Keyword : 3; 2674 2675protected: 2676 TypeWithKeyword(ElaboratedTypeKeyword Keyword, TypeClass tc, 2677 QualType Canonical, bool dependent) 2678 : Type(tc, Canonical, dependent), Keyword(Keyword) {} 2679 2680public: 2681 virtual ~TypeWithKeyword(); // pin vtable to Type.cpp 2682 2683 ElaboratedTypeKeyword getKeyword() const { 2684 return static_cast<ElaboratedTypeKeyword>(Keyword); 2685 } 2686 2687 /// getKeywordForTypeSpec - Converts a type specifier (DeclSpec::TST) 2688 /// into an elaborated type keyword. 2689 static ElaboratedTypeKeyword getKeywordForTypeSpec(unsigned TypeSpec); 2690 2691 /// getTagTypeKindForTypeSpec - Converts a type specifier (DeclSpec::TST) 2692 /// into a tag type kind. It is an error to provide a type specifier 2693 /// which *isn't* a tag kind here. 2694 static TagTypeKind getTagTypeKindForTypeSpec(unsigned TypeSpec); 2695 2696 /// getKeywordForTagDeclKind - Converts a TagTypeKind into an 2697 /// elaborated type keyword. 2698 static ElaboratedTypeKeyword getKeywordForTagTypeKind(TagTypeKind Tag); 2699 2700 /// getTagTypeKindForKeyword - Converts an elaborated type keyword into 2701 // a TagTypeKind. It is an error to provide an elaborated type keyword 2702 /// which *isn't* a tag kind here. 2703 static TagTypeKind getTagTypeKindForKeyword(ElaboratedTypeKeyword Keyword); 2704 2705 static bool KeywordIsTagTypeKind(ElaboratedTypeKeyword Keyword); 2706 2707 static const char *getKeywordName(ElaboratedTypeKeyword Keyword); 2708 2709 static const char *getTagTypeKindName(TagTypeKind Kind) { 2710 return getKeywordName(getKeywordForTagTypeKind(Kind)); 2711 } 2712 2713 class CannotCastToThisType {}; 2714 static CannotCastToThisType classof(const Type *); 2715}; 2716 2717/// \brief Represents a type that was referred to using an elaborated type 2718/// keyword, e.g., struct S, or via a qualified name, e.g., N::M::type, 2719/// or both. 2720/// 2721/// This type is used to keep track of a type name as written in the 2722/// source code, including tag keywords and any nested-name-specifiers. 2723/// The type itself is always "sugar", used to express what was written 2724/// in the source code but containing no additional semantic information. 2725class ElaboratedType : public TypeWithKeyword, public llvm::FoldingSetNode { 2726 2727 /// \brief The nested name specifier containing the qualifier. 2728 NestedNameSpecifier *NNS; 2729 2730 /// \brief The type that this qualified name refers to. 2731 QualType NamedType; 2732 2733 ElaboratedType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS, 2734 QualType NamedType, QualType CanonType) 2735 : TypeWithKeyword(Keyword, Elaborated, CanonType, 2736 NamedType->isDependentType()), 2737 NNS(NNS), NamedType(NamedType) { 2738 assert(!(Keyword == ETK_None && NNS == 0) && 2739 "ElaboratedType cannot have elaborated type keyword " 2740 "and name qualifier both null."); 2741 } 2742 2743 friend class ASTContext; // ASTContext creates these 2744 2745public: 2746 ~ElaboratedType(); 2747 2748 /// \brief Retrieve the qualification on this type. 2749 NestedNameSpecifier *getQualifier() const { return NNS; } 2750 2751 /// \brief Retrieve the type named by the qualified-id. 2752 QualType getNamedType() const { return NamedType; } 2753 2754 /// \brief Remove a single level of sugar. 2755 QualType desugar() const { return getNamedType(); } 2756 2757 /// \brief Returns whether this type directly provides sugar. 2758 bool isSugared() const { return true; } 2759 2760 void Profile(llvm::FoldingSetNodeID &ID) { 2761 Profile(ID, getKeyword(), NNS, NamedType); 2762 } 2763 2764 static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword, 2765 NestedNameSpecifier *NNS, QualType NamedType) { 2766 ID.AddInteger(Keyword); 2767 ID.AddPointer(NNS); 2768 NamedType.Profile(ID); 2769 } 2770 2771 static bool classof(const Type *T) { 2772 return T->getTypeClass() == Elaborated; 2773 } 2774 static bool classof(const ElaboratedType *T) { return true; } 2775}; 2776 2777/// \brief Represents a qualified type name for which the type name is 2778/// dependent. 2779/// 2780/// DependentNameType represents a class of dependent types that involve a 2781/// dependent nested-name-specifier (e.g., "T::") followed by a (dependent) 2782/// name of a type. The DependentNameType may start with a "typename" (for a 2783/// typename-specifier), "class", "struct", "union", or "enum" (for a 2784/// dependent elaborated-type-specifier), or nothing (in contexts where we 2785/// know that we must be referring to a type, e.g., in a base class specifier). 2786class DependentNameType : public TypeWithKeyword, public llvm::FoldingSetNode { 2787 2788 /// \brief The nested name specifier containing the qualifier. 2789 NestedNameSpecifier *NNS; 2790 2791 /// \brief The type that this typename specifier refers to. 2792 const IdentifierInfo *Name; 2793 2794 DependentNameType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS, 2795 const IdentifierInfo *Name, QualType CanonType) 2796 : TypeWithKeyword(Keyword, DependentName, CanonType, true), 2797 NNS(NNS), Name(Name) { 2798 assert(NNS->isDependent() && 2799 "DependentNameType requires a dependent nested-name-specifier"); 2800 } 2801 2802 friend class ASTContext; // ASTContext creates these 2803 2804public: 2805 virtual ~DependentNameType(); 2806 2807 /// \brief Retrieve the qualification on this type. 2808 NestedNameSpecifier *getQualifier() const { return NNS; } 2809 2810 /// \brief Retrieve the type named by the typename specifier as an 2811 /// identifier. 2812 /// 2813 /// This routine will return a non-NULL identifier pointer when the 2814 /// form of the original typename was terminated by an identifier, 2815 /// e.g., "typename T::type". 2816 const IdentifierInfo *getIdentifier() const { 2817 return Name; 2818 } 2819 2820 bool isSugared() const { return false; } 2821 QualType desugar() const { return QualType(this, 0); } 2822 2823 void Profile(llvm::FoldingSetNodeID &ID) { 2824 Profile(ID, getKeyword(), NNS, Name); 2825 } 2826 2827 static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword, 2828 NestedNameSpecifier *NNS, const IdentifierInfo *Name) { 2829 ID.AddInteger(Keyword); 2830 ID.AddPointer(NNS); 2831 ID.AddPointer(Name); 2832 } 2833 2834 static bool classof(const Type *T) { 2835 return T->getTypeClass() == DependentName; 2836 } 2837 static bool classof(const DependentNameType *T) { return true; } 2838}; 2839 2840/// DependentTemplateSpecializationType - Represents a template 2841/// specialization type whose template cannot be resolved, e.g. 2842/// A<T>::template B<T> 2843class DependentTemplateSpecializationType : 2844 public TypeWithKeyword, public llvm::FoldingSetNode { 2845 2846 /// \brief The nested name specifier containing the qualifier. 2847 NestedNameSpecifier *NNS; 2848 2849 /// \brief The identifier of the template. 2850 const IdentifierInfo *Name; 2851 2852 /// \brief - The number of template arguments named in this class 2853 /// template specialization. 2854 unsigned NumArgs; 2855 2856 const TemplateArgument *getArgBuffer() const { 2857 return reinterpret_cast<const TemplateArgument*>(this+1); 2858 } 2859 TemplateArgument *getArgBuffer() { 2860 return reinterpret_cast<TemplateArgument*>(this+1); 2861 } 2862 2863 DependentTemplateSpecializationType(ElaboratedTypeKeyword Keyword, 2864 NestedNameSpecifier *NNS, 2865 const IdentifierInfo *Name, 2866 unsigned NumArgs, 2867 const TemplateArgument *Args, 2868 QualType Canon); 2869 2870 friend class ASTContext; // ASTContext creates these 2871 2872public: 2873 virtual ~DependentTemplateSpecializationType(); 2874 2875 NestedNameSpecifier *getQualifier() const { return NNS; } 2876 const IdentifierInfo *getIdentifier() const { return Name; } 2877 2878 /// \brief Retrieve the template arguments. 2879 const TemplateArgument *getArgs() const { 2880 return getArgBuffer(); 2881 } 2882 2883 /// \brief Retrieve the number of template arguments. 2884 unsigned getNumArgs() const { return NumArgs; } 2885 2886 const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h 2887 2888 typedef const TemplateArgument * iterator; 2889 iterator begin() const { return getArgs(); } 2890 iterator end() const; // inline in TemplateBase.h 2891 2892 bool isSugared() const { return false; } 2893 QualType desugar() const { return QualType(this, 0); } 2894 2895 void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context) { 2896 Profile(ID, Context, getKeyword(), NNS, Name, NumArgs, getArgs()); 2897 } 2898 2899 static void Profile(llvm::FoldingSetNodeID &ID, 2900 ASTContext &Context, 2901 ElaboratedTypeKeyword Keyword, 2902 NestedNameSpecifier *Qualifier, 2903 const IdentifierInfo *Name, 2904 unsigned NumArgs, 2905 const TemplateArgument *Args); 2906 2907 static bool classof(const Type *T) { 2908 return T->getTypeClass() == DependentTemplateSpecialization; 2909 } 2910 static bool classof(const DependentTemplateSpecializationType *T) { 2911 return true; 2912 } 2913}; 2914 2915/// ObjCObjectType - Represents a class type in Objective C. 2916/// Every Objective C type is a combination of a base type and a 2917/// list of protocols. 2918/// 2919/// Given the following declarations: 2920/// @class C; 2921/// @protocol P; 2922/// 2923/// 'C' is an ObjCInterfaceType C. It is sugar for an ObjCObjectType 2924/// with base C and no protocols. 2925/// 2926/// 'C<P>' is an ObjCObjectType with base C and protocol list [P]. 2927/// 2928/// 'id' is a TypedefType which is sugar for an ObjCPointerType whose 2929/// pointee is an ObjCObjectType with base BuiltinType::ObjCIdType 2930/// and no protocols. 2931/// 2932/// 'id<P>' is an ObjCPointerType whose pointee is an ObjCObjecType 2933/// with base BuiltinType::ObjCIdType and protocol list [P]. Eventually 2934/// this should get its own sugar class to better represent the source. 2935class ObjCObjectType : public Type { 2936 // Pad the bit count up so that NumProtocols is 2-byte aligned 2937 unsigned : BitsRemainingInType - 16; 2938 2939 /// \brief The number of protocols stored after the 2940 /// ObjCObjectPointerType node. 2941 /// 2942 /// These protocols are those written directly on the type. If 2943 /// protocol qualifiers ever become additive, the iterators will 2944 /// get kindof complicated. 2945 /// 2946 /// In the canonical object type, these are sorted alphabetically 2947 /// and uniqued. 2948 unsigned NumProtocols : 16; 2949 2950 /// Either a BuiltinType or an InterfaceType or sugar for either. 2951 QualType BaseType; 2952 2953 ObjCProtocolDecl * const *getProtocolStorage() const { 2954 return const_cast<ObjCObjectType*>(this)->getProtocolStorage(); 2955 } 2956 2957 ObjCProtocolDecl **getProtocolStorage(); 2958 2959protected: 2960 ObjCObjectType(QualType Canonical, QualType Base, 2961 ObjCProtocolDecl * const *Protocols, unsigned NumProtocols); 2962 2963 enum Nonce_ObjCInterface { Nonce_ObjCInterface }; 2964 ObjCObjectType(enum Nonce_ObjCInterface) 2965 : Type(ObjCInterface, QualType(), false), 2966 NumProtocols(0), 2967 BaseType(QualType(this_(), 0)) {} 2968 2969protected: 2970 Linkage getLinkageImpl() const; // key function 2971 2972public: 2973 /// getBaseType - Gets the base type of this object type. This is 2974 /// always (possibly sugar for) one of: 2975 /// - the 'id' builtin type (as opposed to the 'id' type visible to the 2976 /// user, which is a typedef for an ObjCPointerType) 2977 /// - the 'Class' builtin type (same caveat) 2978 /// - an ObjCObjectType (currently always an ObjCInterfaceType) 2979 QualType getBaseType() const { return BaseType; } 2980 2981 bool isObjCId() const { 2982 return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCId); 2983 } 2984 bool isObjCClass() const { 2985 return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCClass); 2986 } 2987 bool isObjCUnqualifiedId() const { return qual_empty() && isObjCId(); } 2988 bool isObjCUnqualifiedClass() const { return qual_empty() && isObjCClass(); } 2989 bool isObjCUnqualifiedIdOrClass() const { 2990 if (!qual_empty()) return false; 2991 if (const BuiltinType *T = getBaseType()->getAs<BuiltinType>()) 2992 return T->getKind() == BuiltinType::ObjCId || 2993 T->getKind() == BuiltinType::ObjCClass; 2994 return false; 2995 } 2996 bool isObjCQualifiedId() const { return !qual_empty() && isObjCId(); } 2997 bool isObjCQualifiedClass() const { return !qual_empty() && isObjCClass(); } 2998 2999 /// Gets the interface declaration for this object type, if the base type 3000 /// really is an interface. 3001 ObjCInterfaceDecl *getInterface() const; 3002 3003 typedef ObjCProtocolDecl * const *qual_iterator; 3004 3005 qual_iterator qual_begin() const { return getProtocolStorage(); } 3006 qual_iterator qual_end() const { return qual_begin() + getNumProtocols(); } 3007 3008 bool qual_empty() const { return getNumProtocols() == 0; } 3009 3010 /// getNumProtocols - Return the number of qualifying protocols in this 3011 /// interface type, or 0 if there are none. 3012 unsigned getNumProtocols() const { return NumProtocols; } 3013 3014 /// \brief Fetch a protocol by index. 3015 ObjCProtocolDecl *getProtocol(unsigned I) const { 3016 assert(I < getNumProtocols() && "Out-of-range protocol access"); 3017 return qual_begin()[I]; 3018 } 3019 3020 bool isSugared() const { return false; } 3021 QualType desugar() const { return QualType(this, 0); } 3022 3023 static bool classof(const Type *T) { 3024 return T->getTypeClass() == ObjCObject || 3025 T->getTypeClass() == ObjCInterface; 3026 } 3027 static bool classof(const ObjCObjectType *) { return true; } 3028}; 3029 3030/// ObjCObjectTypeImpl - A class providing a concrete implementation 3031/// of ObjCObjectType, so as to not increase the footprint of 3032/// ObjCInterfaceType. Code outside of ASTContext and the core type 3033/// system should not reference this type. 3034class ObjCObjectTypeImpl : public ObjCObjectType, public llvm::FoldingSetNode { 3035 friend class ASTContext; 3036 3037 // If anyone adds fields here, ObjCObjectType::getProtocolStorage() 3038 // will need to be modified. 3039 3040 ObjCObjectTypeImpl(QualType Canonical, QualType Base, 3041 ObjCProtocolDecl * const *Protocols, 3042 unsigned NumProtocols) 3043 : ObjCObjectType(Canonical, Base, Protocols, NumProtocols) {} 3044 3045public: 3046 void Profile(llvm::FoldingSetNodeID &ID); 3047 static void Profile(llvm::FoldingSetNodeID &ID, 3048 QualType Base, 3049 ObjCProtocolDecl *const *protocols, 3050 unsigned NumProtocols); 3051}; 3052 3053inline ObjCProtocolDecl **ObjCObjectType::getProtocolStorage() { 3054 return reinterpret_cast<ObjCProtocolDecl**>( 3055 static_cast<ObjCObjectTypeImpl*>(this) + 1); 3056} 3057 3058/// ObjCInterfaceType - Interfaces are the core concept in Objective-C for 3059/// object oriented design. They basically correspond to C++ classes. There 3060/// are two kinds of interface types, normal interfaces like "NSString" and 3061/// qualified interfaces, which are qualified with a protocol list like 3062/// "NSString<NSCopyable, NSAmazing>". 3063/// 3064/// ObjCInterfaceType guarantees the following properties when considered 3065/// as a subtype of its superclass, ObjCObjectType: 3066/// - There are no protocol qualifiers. To reinforce this, code which 3067/// tries to invoke the protocol methods via an ObjCInterfaceType will 3068/// fail to compile. 3069/// - It is its own base type. That is, if T is an ObjCInterfaceType*, 3070/// T->getBaseType() == QualType(T, 0). 3071class ObjCInterfaceType : public ObjCObjectType { 3072 ObjCInterfaceDecl *Decl; 3073 3074 ObjCInterfaceType(const ObjCInterfaceDecl *D) 3075 : ObjCObjectType(Nonce_ObjCInterface), 3076 Decl(const_cast<ObjCInterfaceDecl*>(D)) {} 3077 friend class ASTContext; // ASTContext creates these. 3078public: 3079 /// getDecl - Get the declaration of this interface. 3080 ObjCInterfaceDecl *getDecl() const { return Decl; } 3081 3082 bool isSugared() const { return false; } 3083 QualType desugar() const { return QualType(this, 0); } 3084 3085 static bool classof(const Type *T) { 3086 return T->getTypeClass() == ObjCInterface; 3087 } 3088 static bool classof(const ObjCInterfaceType *) { return true; } 3089 3090 // Nonsense to "hide" certain members of ObjCObjectType within this 3091 // class. People asking for protocols on an ObjCInterfaceType are 3092 // not going to get what they want: ObjCInterfaceTypes are 3093 // guaranteed to have no protocols. 3094 enum { 3095 qual_iterator, 3096 qual_begin, 3097 qual_end, 3098 getNumProtocols, 3099 getProtocol 3100 }; 3101}; 3102 3103inline ObjCInterfaceDecl *ObjCObjectType::getInterface() const { 3104 if (const ObjCInterfaceType *T = 3105 getBaseType()->getAs<ObjCInterfaceType>()) 3106 return T->getDecl(); 3107 return 0; 3108} 3109 3110/// ObjCObjectPointerType - Used to represent a pointer to an 3111/// Objective C object. These are constructed from pointer 3112/// declarators when the pointee type is an ObjCObjectType (or sugar 3113/// for one). In addition, the 'id' and 'Class' types are typedefs 3114/// for these, and the protocol-qualified types 'id<P>' and 'Class<P>' 3115/// are translated into these. 3116/// 3117/// Pointers to pointers to Objective C objects are still PointerTypes; 3118/// only the first level of pointer gets it own type implementation. 3119class ObjCObjectPointerType : public Type, public llvm::FoldingSetNode { 3120 QualType PointeeType; 3121 3122 ObjCObjectPointerType(QualType Canonical, QualType Pointee) 3123 : Type(ObjCObjectPointer, Canonical, false), 3124 PointeeType(Pointee) {} 3125 friend class ASTContext; // ASTContext creates these. 3126 3127protected: 3128 virtual Linkage getLinkageImpl() const; 3129 3130public: 3131 /// getPointeeType - Gets the type pointed to by this ObjC pointer. 3132 /// The result will always be an ObjCObjectType or sugar thereof. 3133 QualType getPointeeType() const { return PointeeType; } 3134 3135 /// getObjCObjectType - Gets the type pointed to by this ObjC 3136 /// pointer. This method always returns non-null. 3137 /// 3138 /// This method is equivalent to getPointeeType() except that 3139 /// it discards any typedefs (or other sugar) between this 3140 /// type and the "outermost" object type. So for: 3141 /// @class A; @protocol P; @protocol Q; 3142 /// typedef A<P> AP; 3143 /// typedef A A1; 3144 /// typedef A1<P> A1P; 3145 /// typedef A1P<Q> A1PQ; 3146 /// For 'A*', getObjectType() will return 'A'. 3147 /// For 'A<P>*', getObjectType() will return 'A<P>'. 3148 /// For 'AP*', getObjectType() will return 'A<P>'. 3149 /// For 'A1*', getObjectType() will return 'A'. 3150 /// For 'A1<P>*', getObjectType() will return 'A1<P>'. 3151 /// For 'A1P*', getObjectType() will return 'A1<P>'. 3152 /// For 'A1PQ*', getObjectType() will return 'A1<Q>', because 3153 /// adding protocols to a protocol-qualified base discards the 3154 /// old qualifiers (for now). But if it didn't, getObjectType() 3155 /// would return 'A1P<Q>' (and we'd have to make iterating over 3156 /// qualifiers more complicated). 3157 const ObjCObjectType *getObjectType() const { 3158 return PointeeType->getAs<ObjCObjectType>(); 3159 } 3160 3161 /// getInterfaceType - If this pointer points to an Objective C 3162 /// @interface type, gets the type for that interface. Any protocol 3163 /// qualifiers on the interface are ignored. 3164 /// 3165 /// \return null if the base type for this pointer is 'id' or 'Class' 3166 const ObjCInterfaceType *getInterfaceType() const { 3167 return getObjectType()->getBaseType()->getAs<ObjCInterfaceType>(); 3168 } 3169 3170 /// getInterfaceDecl - If this pointer points to an Objective @interface 3171 /// type, gets the declaration for that interface. 3172 /// 3173 /// \return null if the base type for this pointer is 'id' or 'Class' 3174 ObjCInterfaceDecl *getInterfaceDecl() const { 3175 return getObjectType()->getInterface(); 3176 } 3177 3178 /// isObjCIdType - True if this is equivalent to the 'id' type, i.e. if 3179 /// its object type is the primitive 'id' type with no protocols. 3180 bool isObjCIdType() const { 3181 return getObjectType()->isObjCUnqualifiedId(); 3182 } 3183 3184 /// isObjCClassType - True if this is equivalent to the 'Class' type, 3185 /// i.e. if its object tive is the primitive 'Class' type with no protocols. 3186 bool isObjCClassType() const { 3187 return getObjectType()->isObjCUnqualifiedClass(); 3188 } 3189 3190 /// isObjCQualifiedIdType - True if this is equivalent to 'id<P>' for some 3191 /// non-empty set of protocols. 3192 bool isObjCQualifiedIdType() const { 3193 return getObjectType()->isObjCQualifiedId(); 3194 } 3195 3196 /// isObjCQualifiedClassType - True if this is equivalent to 'Class<P>' for 3197 /// some non-empty set of protocols. 3198 bool isObjCQualifiedClassType() const { 3199 return getObjectType()->isObjCQualifiedClass(); 3200 } 3201 3202 /// An iterator over the qualifiers on the object type. Provided 3203 /// for convenience. This will always iterate over the full set of 3204 /// protocols on a type, not just those provided directly. 3205 typedef ObjCObjectType::qual_iterator qual_iterator; 3206 3207 qual_iterator qual_begin() const { 3208 return getObjectType()->qual_begin(); 3209 } 3210 qual_iterator qual_end() const { 3211 return getObjectType()->qual_end(); 3212 } 3213 bool qual_empty() const { return getObjectType()->qual_empty(); } 3214 3215 /// getNumProtocols - Return the number of qualifying protocols on 3216 /// the object type. 3217 unsigned getNumProtocols() const { 3218 return getObjectType()->getNumProtocols(); 3219 } 3220 3221 /// \brief Retrieve a qualifying protocol by index on the object 3222 /// type. 3223 ObjCProtocolDecl *getProtocol(unsigned I) const { 3224 return getObjectType()->getProtocol(I); 3225 } 3226 3227 bool isSugared() const { return false; } 3228 QualType desugar() const { return QualType(this, 0); } 3229 3230 void Profile(llvm::FoldingSetNodeID &ID) { 3231 Profile(ID, getPointeeType()); 3232 } 3233 static void Profile(llvm::FoldingSetNodeID &ID, QualType T) { 3234 ID.AddPointer(T.getAsOpaquePtr()); 3235 } 3236 static bool classof(const Type *T) { 3237 return T->getTypeClass() == ObjCObjectPointer; 3238 } 3239 static bool classof(const ObjCObjectPointerType *) { return true; } 3240}; 3241 3242/// A qualifier set is used to build a set of qualifiers. 3243class QualifierCollector : public Qualifiers { 3244 ASTContext *Context; 3245 3246public: 3247 QualifierCollector(Qualifiers Qs = Qualifiers()) 3248 : Qualifiers(Qs), Context(0) {} 3249 QualifierCollector(ASTContext &Context, Qualifiers Qs = Qualifiers()) 3250 : Qualifiers(Qs), Context(&Context) {} 3251 3252 void setContext(ASTContext &C) { Context = &C; } 3253 3254 /// Collect any qualifiers on the given type and return an 3255 /// unqualified type. 3256 const Type *strip(QualType QT) { 3257 addFastQualifiers(QT.getLocalFastQualifiers()); 3258 if (QT.hasLocalNonFastQualifiers()) { 3259 const ExtQuals *EQ = QT.getExtQualsUnsafe(); 3260 Context = &EQ->getContext(); 3261 addQualifiers(EQ->getQualifiers()); 3262 return EQ->getBaseType(); 3263 } 3264 return QT.getTypePtrUnsafe(); 3265 } 3266 3267 /// Apply the collected qualifiers to the given type. 3268 QualType apply(QualType QT) const; 3269 3270 /// Apply the collected qualifiers to the given type. 3271 QualType apply(const Type* T) const; 3272 3273}; 3274 3275 3276// Inline function definitions. 3277 3278inline bool QualType::isCanonical() const { 3279 const Type *T = getTypePtr(); 3280 if (hasLocalQualifiers()) 3281 return T->isCanonicalUnqualified() && !isa<ArrayType>(T); 3282 return T->isCanonicalUnqualified(); 3283} 3284 3285inline bool QualType::isCanonicalAsParam() const { 3286 if (hasLocalQualifiers()) return false; 3287 3288 const Type *T = getTypePtr(); 3289 if ((*this)->isPointerType()) { 3290 QualType BaseType = (*this)->getAs<PointerType>()->getPointeeType(); 3291 if (isa<VariableArrayType>(BaseType)) { 3292 ArrayType *AT = dyn_cast<ArrayType>(BaseType); 3293 VariableArrayType *VAT = cast<VariableArrayType>(AT); 3294 if (VAT->getSizeExpr()) 3295 T = BaseType.getTypePtr(); 3296 } 3297 } 3298 return T->isCanonicalUnqualified() && 3299 !isa<FunctionType>(T) && !isa<ArrayType>(T); 3300} 3301 3302inline bool QualType::isConstQualified() const { 3303 return isLocalConstQualified() || 3304 getTypePtr()->getCanonicalTypeInternal().isLocalConstQualified(); 3305} 3306 3307inline bool QualType::isRestrictQualified() const { 3308 return isLocalRestrictQualified() || 3309 getTypePtr()->getCanonicalTypeInternal().isLocalRestrictQualified(); 3310} 3311 3312 3313inline bool QualType::isVolatileQualified() const { 3314 return isLocalVolatileQualified() || 3315 getTypePtr()->getCanonicalTypeInternal().isLocalVolatileQualified(); 3316} 3317 3318inline bool QualType::hasQualifiers() const { 3319 return hasLocalQualifiers() || 3320 getTypePtr()->getCanonicalTypeInternal().hasLocalQualifiers(); 3321} 3322 3323inline Qualifiers QualType::getQualifiers() const { 3324 Qualifiers Quals = getLocalQualifiers(); 3325 Quals.addQualifiers( 3326 getTypePtr()->getCanonicalTypeInternal().getLocalQualifiers()); 3327 return Quals; 3328} 3329 3330inline unsigned QualType::getCVRQualifiers() const { 3331 return getLocalCVRQualifiers() | 3332 getTypePtr()->getCanonicalTypeInternal().getLocalCVRQualifiers(); 3333} 3334 3335/// getCVRQualifiersThroughArrayTypes - If there are CVR qualifiers for this 3336/// type, returns them. Otherwise, if this is an array type, recurses 3337/// on the element type until some qualifiers have been found or a non-array 3338/// type reached. 3339inline unsigned QualType::getCVRQualifiersThroughArrayTypes() const { 3340 if (unsigned Quals = getCVRQualifiers()) 3341 return Quals; 3342 QualType CT = getTypePtr()->getCanonicalTypeInternal(); 3343 if (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 3344 return AT->getElementType().getCVRQualifiersThroughArrayTypes(); 3345 return 0; 3346} 3347 3348inline void QualType::removeConst() { 3349 removeFastQualifiers(Qualifiers::Const); 3350} 3351 3352inline void QualType::removeRestrict() { 3353 removeFastQualifiers(Qualifiers::Restrict); 3354} 3355 3356inline void QualType::removeVolatile() { 3357 QualifierCollector Qc; 3358 const Type *Ty = Qc.strip(*this); 3359 if (Qc.hasVolatile()) { 3360 Qc.removeVolatile(); 3361 *this = Qc.apply(Ty); 3362 } 3363} 3364 3365inline void QualType::removeCVRQualifiers(unsigned Mask) { 3366 assert(!(Mask & ~Qualifiers::CVRMask) && "mask has non-CVR bits"); 3367 3368 // Fast path: we don't need to touch the slow qualifiers. 3369 if (!(Mask & ~Qualifiers::FastMask)) { 3370 removeFastQualifiers(Mask); 3371 return; 3372 } 3373 3374 QualifierCollector Qc; 3375 const Type *Ty = Qc.strip(*this); 3376 Qc.removeCVRQualifiers(Mask); 3377 *this = Qc.apply(Ty); 3378} 3379 3380/// getAddressSpace - Return the address space of this type. 3381inline unsigned QualType::getAddressSpace() const { 3382 if (hasLocalNonFastQualifiers()) { 3383 const ExtQuals *EQ = getExtQualsUnsafe(); 3384 if (EQ->hasAddressSpace()) 3385 return EQ->getAddressSpace(); 3386 } 3387 3388 QualType CT = getTypePtr()->getCanonicalTypeInternal(); 3389 if (CT.hasLocalNonFastQualifiers()) { 3390 const ExtQuals *EQ = CT.getExtQualsUnsafe(); 3391 if (EQ->hasAddressSpace()) 3392 return EQ->getAddressSpace(); 3393 } 3394 3395 if (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 3396 return AT->getElementType().getAddressSpace(); 3397 if (const RecordType *RT = dyn_cast<RecordType>(CT)) 3398 return RT->getAddressSpace(); 3399 return 0; 3400} 3401 3402/// getObjCGCAttr - Return the gc attribute of this type. 3403inline Qualifiers::GC QualType::getObjCGCAttr() const { 3404 if (hasLocalNonFastQualifiers()) { 3405 const ExtQuals *EQ = getExtQualsUnsafe(); 3406 if (EQ->hasObjCGCAttr()) 3407 return EQ->getObjCGCAttr(); 3408 } 3409 3410 QualType CT = getTypePtr()->getCanonicalTypeInternal(); 3411 if (CT.hasLocalNonFastQualifiers()) { 3412 const ExtQuals *EQ = CT.getExtQualsUnsafe(); 3413 if (EQ->hasObjCGCAttr()) 3414 return EQ->getObjCGCAttr(); 3415 } 3416 3417 if (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 3418 return AT->getElementType().getObjCGCAttr(); 3419 if (const ObjCObjectPointerType *PT = CT->getAs<ObjCObjectPointerType>()) 3420 return PT->getPointeeType().getObjCGCAttr(); 3421 // We most look at all pointer types, not just pointer to interface types. 3422 if (const PointerType *PT = CT->getAs<PointerType>()) 3423 return PT->getPointeeType().getObjCGCAttr(); 3424 return Qualifiers::GCNone; 3425} 3426 3427inline FunctionType::ExtInfo getFunctionExtInfo(const Type &t) { 3428 if (const PointerType *PT = t.getAs<PointerType>()) { 3429 if (const FunctionType *FT = PT->getPointeeType()->getAs<FunctionType>()) 3430 return FT->getExtInfo(); 3431 } else if (const FunctionType *FT = t.getAs<FunctionType>()) 3432 return FT->getExtInfo(); 3433 3434 return FunctionType::ExtInfo(); 3435} 3436 3437inline FunctionType::ExtInfo getFunctionExtInfo(QualType t) { 3438 return getFunctionExtInfo(*t); 3439} 3440 3441/// \brief Determine whether this set of qualifiers is a superset of the given 3442/// set of qualifiers. 3443inline bool Qualifiers::isSupersetOf(Qualifiers Other) const { 3444 return Mask != Other.Mask && (Mask | Other.Mask) == Mask; 3445} 3446 3447/// isMoreQualifiedThan - Determine whether this type is more 3448/// qualified than the Other type. For example, "const volatile int" 3449/// is more qualified than "const int", "volatile int", and 3450/// "int". However, it is not more qualified than "const volatile 3451/// int". 3452inline bool QualType::isMoreQualifiedThan(QualType Other) const { 3453 // FIXME: work on arbitrary qualifiers 3454 unsigned MyQuals = this->getCVRQualifiersThroughArrayTypes(); 3455 unsigned OtherQuals = Other.getCVRQualifiersThroughArrayTypes(); 3456 if (getAddressSpace() != Other.getAddressSpace()) 3457 return false; 3458 return MyQuals != OtherQuals && (MyQuals | OtherQuals) == MyQuals; 3459} 3460 3461/// isAtLeastAsQualifiedAs - Determine whether this type is at last 3462/// as qualified as the Other type. For example, "const volatile 3463/// int" is at least as qualified as "const int", "volatile int", 3464/// "int", and "const volatile int". 3465inline bool QualType::isAtLeastAsQualifiedAs(QualType Other) const { 3466 // FIXME: work on arbitrary qualifiers 3467 unsigned MyQuals = this->getCVRQualifiersThroughArrayTypes(); 3468 unsigned OtherQuals = Other.getCVRQualifiersThroughArrayTypes(); 3469 if (getAddressSpace() != Other.getAddressSpace()) 3470 return false; 3471 return (MyQuals | OtherQuals) == MyQuals; 3472} 3473 3474/// getNonReferenceType - If Type is a reference type (e.g., const 3475/// int&), returns the type that the reference refers to ("const 3476/// int"). Otherwise, returns the type itself. This routine is used 3477/// throughout Sema to implement C++ 5p6: 3478/// 3479/// If an expression initially has the type "reference to T" (8.3.2, 3480/// 8.5.3), the type is adjusted to "T" prior to any further 3481/// analysis, the expression designates the object or function 3482/// denoted by the reference, and the expression is an lvalue. 3483inline QualType QualType::getNonReferenceType() const { 3484 if (const ReferenceType *RefType = (*this)->getAs<ReferenceType>()) 3485 return RefType->getPointeeType(); 3486 else 3487 return *this; 3488} 3489 3490inline bool Type::isFunctionType() const { 3491 return isa<FunctionType>(CanonicalType); 3492} 3493inline bool Type::isPointerType() const { 3494 return isa<PointerType>(CanonicalType); 3495} 3496inline bool Type::isAnyPointerType() const { 3497 return isPointerType() || isObjCObjectPointerType(); 3498} 3499inline bool Type::isBlockPointerType() const { 3500 return isa<BlockPointerType>(CanonicalType); 3501} 3502inline bool Type::isReferenceType() const { 3503 return isa<ReferenceType>(CanonicalType); 3504} 3505inline bool Type::isLValueReferenceType() const { 3506 return isa<LValueReferenceType>(CanonicalType); 3507} 3508inline bool Type::isRValueReferenceType() const { 3509 return isa<RValueReferenceType>(CanonicalType); 3510} 3511inline bool Type::isFunctionPointerType() const { 3512 if (const PointerType* T = getAs<PointerType>()) 3513 return T->getPointeeType()->isFunctionType(); 3514 else 3515 return false; 3516} 3517inline bool Type::isMemberPointerType() const { 3518 return isa<MemberPointerType>(CanonicalType); 3519} 3520inline bool Type::isMemberFunctionPointerType() const { 3521 if (const MemberPointerType* T = getAs<MemberPointerType>()) 3522 return T->isMemberFunctionPointer(); 3523 else 3524 return false; 3525} 3526inline bool Type::isMemberDataPointerType() const { 3527 if (const MemberPointerType* T = getAs<MemberPointerType>()) 3528 return T->isMemberDataPointer(); 3529 else 3530 return false; 3531} 3532inline bool Type::isArrayType() const { 3533 return isa<ArrayType>(CanonicalType); 3534} 3535inline bool Type::isConstantArrayType() const { 3536 return isa<ConstantArrayType>(CanonicalType); 3537} 3538inline bool Type::isIncompleteArrayType() const { 3539 return isa<IncompleteArrayType>(CanonicalType); 3540} 3541inline bool Type::isVariableArrayType() const { 3542 return isa<VariableArrayType>(CanonicalType); 3543} 3544inline bool Type::isDependentSizedArrayType() const { 3545 return isa<DependentSizedArrayType>(CanonicalType); 3546} 3547inline bool Type::isBuiltinType() const { 3548 return isa<BuiltinType>(CanonicalType); 3549} 3550inline bool Type::isRecordType() const { 3551 return isa<RecordType>(CanonicalType); 3552} 3553inline bool Type::isEnumeralType() const { 3554 return isa<EnumType>(CanonicalType); 3555} 3556inline bool Type::isAnyComplexType() const { 3557 return isa<ComplexType>(CanonicalType); 3558} 3559inline bool Type::isVectorType() const { 3560 return isa<VectorType>(CanonicalType); 3561} 3562inline bool Type::isExtVectorType() const { 3563 return isa<ExtVectorType>(CanonicalType); 3564} 3565inline bool Type::isObjCObjectPointerType() const { 3566 return isa<ObjCObjectPointerType>(CanonicalType); 3567} 3568inline bool Type::isObjCObjectType() const { 3569 return isa<ObjCObjectType>(CanonicalType); 3570} 3571inline bool Type::isObjCObjectOrInterfaceType() const { 3572 return isa<ObjCInterfaceType>(CanonicalType) || 3573 isa<ObjCObjectType>(CanonicalType); 3574} 3575 3576inline bool Type::isObjCQualifiedIdType() const { 3577 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 3578 return OPT->isObjCQualifiedIdType(); 3579 return false; 3580} 3581inline bool Type::isObjCQualifiedClassType() const { 3582 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 3583 return OPT->isObjCQualifiedClassType(); 3584 return false; 3585} 3586inline bool Type::isObjCIdType() const { 3587 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 3588 return OPT->isObjCIdType(); 3589 return false; 3590} 3591inline bool Type::isObjCClassType() const { 3592 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 3593 return OPT->isObjCClassType(); 3594 return false; 3595} 3596inline bool Type::isObjCSelType() const { 3597 if (const PointerType *OPT = getAs<PointerType>()) 3598 return OPT->getPointeeType()->isSpecificBuiltinType(BuiltinType::ObjCSel); 3599 return false; 3600} 3601inline bool Type::isObjCBuiltinType() const { 3602 return isObjCIdType() || isObjCClassType() || isObjCSelType(); 3603} 3604inline bool Type::isTemplateTypeParmType() const { 3605 return isa<TemplateTypeParmType>(CanonicalType); 3606} 3607 3608inline bool Type::isSpecificBuiltinType(unsigned K) const { 3609 if (const BuiltinType *BT = getAs<BuiltinType>()) 3610 if (BT->getKind() == (BuiltinType::Kind) K) 3611 return true; 3612 return false; 3613} 3614 3615/// \brief Determines whether this is a type for which one can define 3616/// an overloaded operator. 3617inline bool Type::isOverloadableType() const { 3618 return isDependentType() || isRecordType() || isEnumeralType(); 3619} 3620 3621inline bool Type::hasPointerRepresentation() const { 3622 return (isPointerType() || isReferenceType() || isBlockPointerType() || 3623 isObjCObjectPointerType() || isNullPtrType()); 3624} 3625 3626inline bool Type::hasObjCPointerRepresentation() const { 3627 return isObjCObjectPointerType(); 3628} 3629 3630/// Insertion operator for diagnostics. This allows sending QualType's into a 3631/// diagnostic with <<. 3632inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB, 3633 QualType T) { 3634 DB.AddTaggedVal(reinterpret_cast<intptr_t>(T.getAsOpaquePtr()), 3635 Diagnostic::ak_qualtype); 3636 return DB; 3637} 3638 3639/// Insertion operator for partial diagnostics. This allows sending QualType's 3640/// into a diagnostic with <<. 3641inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD, 3642 QualType T) { 3643 PD.AddTaggedVal(reinterpret_cast<intptr_t>(T.getAsOpaquePtr()), 3644 Diagnostic::ak_qualtype); 3645 return PD; 3646} 3647 3648// Helper class template that is used by Type::getAs to ensure that one does 3649// not try to look through a qualified type to get to an array type. 3650template<typename T, 3651 bool isArrayType = (llvm::is_same<T, ArrayType>::value || 3652 llvm::is_base_of<ArrayType, T>::value)> 3653struct ArrayType_cannot_be_used_with_getAs { }; 3654 3655template<typename T> 3656struct ArrayType_cannot_be_used_with_getAs<T, true>; 3657 3658/// Member-template getAs<specific type>'. 3659template <typename T> const T *Type::getAs() const { 3660 ArrayType_cannot_be_used_with_getAs<T> at; 3661 (void)at; 3662 3663 // If this is directly a T type, return it. 3664 if (const T *Ty = dyn_cast<T>(this)) 3665 return Ty; 3666 3667 // If the canonical form of this type isn't the right kind, reject it. 3668 if (!isa<T>(CanonicalType)) 3669 return 0; 3670 3671 // If this is a typedef for the type, strip the typedef off without 3672 // losing all typedef information. 3673 return cast<T>(getUnqualifiedDesugaredType()); 3674} 3675 3676} // end namespace clang 3677 3678#endif 3679