Type.h revision 8079eee9128444d02bebf24410126f9d55399f84
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 std::string getAsString() const; 294 std::string getAsString(const PrintingPolicy &Policy) const { 295 std::string Buffer; 296 getAsStringInternal(Buffer, Policy); 297 return Buffer; 298 } 299 void getAsStringInternal(std::string &S, const PrintingPolicy &Policy) const; 300 301 void Profile(llvm::FoldingSetNodeID &ID) const { 302 ID.AddInteger(Mask); 303 } 304 305private: 306 307 // bits: |0 1 2|3 .. 4|5 .. 31| 308 // |C R V|GCAttr|AddrSpace| 309 uint32_t Mask; 310 311 static const uint32_t GCAttrMask = 0x18; 312 static const uint32_t GCAttrShift = 3; 313 static const uint32_t AddressSpaceMask = ~(CVRMask | GCAttrMask); 314 static const uint32_t AddressSpaceShift = 5; 315}; 316 317 318/// ExtQuals - We can encode up to three bits in the low bits of a 319/// type pointer, but there are many more type qualifiers that we want 320/// to be able to apply to an arbitrary type. Therefore we have this 321/// struct, intended to be heap-allocated and used by QualType to 322/// store qualifiers. 323/// 324/// The current design tags the 'const' and 'restrict' qualifiers in 325/// two low bits on the QualType pointer; a third bit records whether 326/// the pointer is an ExtQuals node. 'const' was chosen because it is 327/// orders of magnitude more common than the other two qualifiers, in 328/// both library and user code. It's relatively rare to see 329/// 'restrict' in user code, but many standard C headers are saturated 330/// with 'restrict' declarations, so that representing them efficiently 331/// is a critical goal of this representation. 332class ExtQuals : public llvm::FoldingSetNode { 333 // NOTE: changing the fast qualifiers should be straightforward as 334 // long as you don't make 'const' non-fast. 335 // 1. Qualifiers: 336 // a) Modify the bitmasks (Qualifiers::TQ and DeclSpec::TQ). 337 // Fast qualifiers must occupy the low-order bits. 338 // b) Update Qualifiers::FastWidth and FastMask. 339 // 2. QualType: 340 // a) Update is{Volatile,Restrict}Qualified(), defined inline. 341 // b) Update remove{Volatile,Restrict}, defined near the end of 342 // this header. 343 // 3. ASTContext: 344 // a) Update get{Volatile,Restrict}Type. 345 346 /// Context - the context to which this set belongs. We save this 347 /// here so that QualifierCollector can use it to reapply extended 348 /// qualifiers to an arbitrary type without requiring a context to 349 /// be pushed through every single API dealing with qualifiers. 350 ASTContext& Context; 351 352 /// BaseType - the underlying type that this qualifies 353 const Type *BaseType; 354 355 /// Quals - the immutable set of qualifiers applied by this 356 /// node; always contains extended qualifiers. 357 Qualifiers Quals; 358 359public: 360 ExtQuals(ASTContext& Context, const Type *Base, Qualifiers Quals) 361 : Context(Context), BaseType(Base), Quals(Quals) 362 { 363 assert(Quals.hasNonFastQualifiers() 364 && "ExtQuals created with no fast qualifiers"); 365 assert(!Quals.hasFastQualifiers() 366 && "ExtQuals created with fast qualifiers"); 367 } 368 369 Qualifiers getQualifiers() const { return Quals; } 370 371 bool hasVolatile() const { return Quals.hasVolatile(); } 372 373 bool hasObjCGCAttr() const { return Quals.hasObjCGCAttr(); } 374 Qualifiers::GC getObjCGCAttr() const { return Quals.getObjCGCAttr(); } 375 376 bool hasAddressSpace() const { return Quals.hasAddressSpace(); } 377 unsigned getAddressSpace() const { return Quals.getAddressSpace(); } 378 379 const Type *getBaseType() const { return BaseType; } 380 381 ASTContext &getContext() const { return Context; } 382 383public: 384 void Profile(llvm::FoldingSetNodeID &ID) const { 385 Profile(ID, getBaseType(), Quals); 386 } 387 static void Profile(llvm::FoldingSetNodeID &ID, 388 const Type *BaseType, 389 Qualifiers Quals) { 390 assert(!Quals.hasFastQualifiers() && "fast qualifiers in ExtQuals hash!"); 391 ID.AddPointer(BaseType); 392 Quals.Profile(ID); 393 } 394}; 395 396/// CallingConv - Specifies the calling convention that a function uses. 397enum CallingConv { 398 CC_Default, 399 CC_C, // __attribute__((cdecl)) 400 CC_X86StdCall, // __attribute__((stdcall)) 401 CC_X86FastCall, // __attribute__((fastcall)) 402 CC_X86ThisCall // __attribute__((thiscall)) 403}; 404 405 406/// QualType - For efficiency, we don't store CV-qualified types as nodes on 407/// their own: instead each reference to a type stores the qualifiers. This 408/// greatly reduces the number of nodes we need to allocate for types (for 409/// example we only need one for 'int', 'const int', 'volatile int', 410/// 'const volatile int', etc). 411/// 412/// As an added efficiency bonus, instead of making this a pair, we 413/// just store the two bits we care about in the low bits of the 414/// pointer. To handle the packing/unpacking, we make QualType be a 415/// simple wrapper class that acts like a smart pointer. A third bit 416/// indicates whether there are extended qualifiers present, in which 417/// case the pointer points to a special structure. 418class QualType { 419 // Thankfully, these are efficiently composable. 420 llvm::PointerIntPair<llvm::PointerUnion<const Type*,const ExtQuals*>, 421 Qualifiers::FastWidth> Value; 422 423 const ExtQuals *getExtQualsUnsafe() const { 424 return Value.getPointer().get<const ExtQuals*>(); 425 } 426 427 const Type *getTypePtrUnsafe() const { 428 return Value.getPointer().get<const Type*>(); 429 } 430 431 QualType getUnqualifiedTypeSlow() const; 432 433 friend class QualifierCollector; 434public: 435 QualType() {} 436 437 QualType(const Type *Ptr, unsigned Quals) 438 : Value(Ptr, Quals) {} 439 QualType(const ExtQuals *Ptr, unsigned Quals) 440 : Value(Ptr, Quals) {} 441 442 unsigned getLocalFastQualifiers() const { return Value.getInt(); } 443 void setLocalFastQualifiers(unsigned Quals) { Value.setInt(Quals); } 444 445 /// Retrieves a pointer to the underlying (unqualified) type. 446 /// This should really return a const Type, but it's not worth 447 /// changing all the users right now. 448 Type *getTypePtr() const { 449 if (hasLocalNonFastQualifiers()) 450 return const_cast<Type*>(getExtQualsUnsafe()->getBaseType()); 451 return const_cast<Type*>(getTypePtrUnsafe()); 452 } 453 454 void *getAsOpaquePtr() const { return Value.getOpaqueValue(); } 455 static QualType getFromOpaquePtr(void *Ptr) { 456 QualType T; 457 T.Value.setFromOpaqueValue(Ptr); 458 return T; 459 } 460 461 Type &operator*() const { 462 return *getTypePtr(); 463 } 464 465 Type *operator->() const { 466 return getTypePtr(); 467 } 468 469 bool isCanonical() const; 470 bool isCanonicalAsParam() const; 471 472 /// isNull - Return true if this QualType doesn't point to a type yet. 473 bool isNull() const { 474 return Value.getPointer().isNull(); 475 } 476 477 /// \brief Determine whether this particular QualType instance has the 478 /// "const" qualifier set, without looking through typedefs that may have 479 /// added "const" at a different level. 480 bool isLocalConstQualified() const { 481 return (getLocalFastQualifiers() & Qualifiers::Const); 482 } 483 484 /// \brief Determine whether this type is const-qualified. 485 bool isConstQualified() const; 486 487 /// \brief Determine whether this particular QualType instance has the 488 /// "restrict" qualifier set, without looking through typedefs that may have 489 /// added "restrict" at a different level. 490 bool isLocalRestrictQualified() const { 491 return (getLocalFastQualifiers() & Qualifiers::Restrict); 492 } 493 494 /// \brief Determine whether this type is restrict-qualified. 495 bool isRestrictQualified() const; 496 497 /// \brief Determine whether this particular QualType instance has the 498 /// "volatile" qualifier set, without looking through typedefs that may have 499 /// added "volatile" at a different level. 500 bool isLocalVolatileQualified() const { 501 return (hasLocalNonFastQualifiers() && getExtQualsUnsafe()->hasVolatile()); 502 } 503 504 /// \brief Determine whether this type is volatile-qualified. 505 bool isVolatileQualified() const; 506 507 /// \brief Determine whether this particular QualType instance has any 508 /// qualifiers, without looking through any typedefs that might add 509 /// qualifiers at a different level. 510 bool hasLocalQualifiers() const { 511 return getLocalFastQualifiers() || hasLocalNonFastQualifiers(); 512 } 513 514 /// \brief Determine whether this type has any qualifiers. 515 bool hasQualifiers() const; 516 517 /// \brief Determine whether this particular QualType instance has any 518 /// "non-fast" qualifiers, e.g., those that are stored in an ExtQualType 519 /// instance. 520 bool hasLocalNonFastQualifiers() const { 521 return Value.getPointer().is<const ExtQuals*>(); 522 } 523 524 /// \brief Retrieve the set of qualifiers local to this particular QualType 525 /// instance, not including any qualifiers acquired through typedefs or 526 /// other sugar. 527 Qualifiers getLocalQualifiers() const { 528 Qualifiers Quals; 529 if (hasLocalNonFastQualifiers()) 530 Quals = getExtQualsUnsafe()->getQualifiers(); 531 Quals.addFastQualifiers(getLocalFastQualifiers()); 532 return Quals; 533 } 534 535 /// \brief Retrieve the set of qualifiers applied to this type. 536 Qualifiers getQualifiers() const; 537 538 /// \brief Retrieve the set of CVR (const-volatile-restrict) qualifiers 539 /// local to this particular QualType instance, not including any qualifiers 540 /// acquired through typedefs or other sugar. 541 unsigned getLocalCVRQualifiers() const { 542 unsigned CVR = getLocalFastQualifiers(); 543 if (isLocalVolatileQualified()) 544 CVR |= Qualifiers::Volatile; 545 return CVR; 546 } 547 548 /// \brief Retrieve the set of CVR (const-volatile-restrict) qualifiers 549 /// applied to this type. 550 unsigned getCVRQualifiers() const; 551 552 /// \brief Retrieve the set of CVR (const-volatile-restrict) qualifiers 553 /// applied to this type, looking through any number of unqualified array 554 /// types to their element types' qualifiers. 555 unsigned getCVRQualifiersThroughArrayTypes() const; 556 557 bool isConstant(ASTContext& Ctx) const { 558 return QualType::isConstant(*this, Ctx); 559 } 560 561 // Don't promise in the API that anything besides 'const' can be 562 // easily added. 563 564 /// addConst - add the specified type qualifier to this QualType. 565 void addConst() { 566 addFastQualifiers(Qualifiers::Const); 567 } 568 QualType withConst() const { 569 return withFastQualifiers(Qualifiers::Const); 570 } 571 572 void addFastQualifiers(unsigned TQs) { 573 assert(!(TQs & ~Qualifiers::FastMask) 574 && "non-fast qualifier bits set in mask!"); 575 Value.setInt(Value.getInt() | TQs); 576 } 577 578 // FIXME: The remove* functions are semantically broken, because they might 579 // not remove a qualifier stored on a typedef. Most of the with* functions 580 // have the same problem. 581 void removeConst(); 582 void removeVolatile(); 583 void removeRestrict(); 584 void removeCVRQualifiers(unsigned Mask); 585 586 void removeFastQualifiers() { Value.setInt(0); } 587 void removeFastQualifiers(unsigned Mask) { 588 assert(!(Mask & ~Qualifiers::FastMask) && "mask has non-fast qualifiers"); 589 Value.setInt(Value.getInt() & ~Mask); 590 } 591 592 // Creates a type with the given qualifiers in addition to any 593 // qualifiers already on this type. 594 QualType withFastQualifiers(unsigned TQs) const { 595 QualType T = *this; 596 T.addFastQualifiers(TQs); 597 return T; 598 } 599 600 // Creates a type with exactly the given fast qualifiers, removing 601 // any existing fast qualifiers. 602 QualType withExactFastQualifiers(unsigned TQs) const { 603 return withoutFastQualifiers().withFastQualifiers(TQs); 604 } 605 606 // Removes fast qualifiers, but leaves any extended qualifiers in place. 607 QualType withoutFastQualifiers() const { 608 QualType T = *this; 609 T.removeFastQualifiers(); 610 return T; 611 } 612 613 /// \brief Return this type with all of the instance-specific qualifiers 614 /// removed, but without removing any qualifiers that may have been applied 615 /// through typedefs. 616 QualType getLocalUnqualifiedType() const { return QualType(getTypePtr(), 0); } 617 618 /// \brief Return the unqualified form of the given type, which might be 619 /// desugared to eliminate qualifiers introduced via typedefs. 620 QualType getUnqualifiedType() const { 621 QualType T = getLocalUnqualifiedType(); 622 if (!T.hasQualifiers()) 623 return T; 624 625 return getUnqualifiedTypeSlow(); 626 } 627 628 bool isMoreQualifiedThan(QualType Other) const; 629 bool isAtLeastAsQualifiedAs(QualType Other) const; 630 QualType getNonReferenceType() const; 631 632 /// \brief Determine the type of an expression that calls a function of 633 /// with the given result type. 634 /// 635 /// This routine removes a top-level reference (since there are no 636 /// expressions of reference type) and deletes top-level cvr-qualifiers 637 /// from non-class types (in C++) or all types (in C). 638 QualType getCallResultType(ASTContext &Context) const; 639 640 /// getDesugaredType - Return the specified type with any "sugar" removed from 641 /// the type. This takes off typedefs, typeof's etc. If the outer level of 642 /// the type is already concrete, it returns it unmodified. This is similar 643 /// to getting the canonical type, but it doesn't remove *all* typedefs. For 644 /// example, it returns "T*" as "T*", (not as "int*"), because the pointer is 645 /// concrete. 646 /// 647 /// Qualifiers are left in place. 648 QualType getDesugaredType() const { 649 return QualType::getDesugaredType(*this); 650 } 651 652 /// operator==/!= - Indicate whether the specified types and qualifiers are 653 /// identical. 654 friend bool operator==(const QualType &LHS, const QualType &RHS) { 655 return LHS.Value == RHS.Value; 656 } 657 friend bool operator!=(const QualType &LHS, const QualType &RHS) { 658 return LHS.Value != RHS.Value; 659 } 660 std::string getAsString() const; 661 662 std::string getAsString(const PrintingPolicy &Policy) const { 663 std::string S; 664 getAsStringInternal(S, Policy); 665 return S; 666 } 667 void getAsStringInternal(std::string &Str, 668 const PrintingPolicy &Policy) const; 669 670 void dump(const char *s) const; 671 void dump() const; 672 673 void Profile(llvm::FoldingSetNodeID &ID) const { 674 ID.AddPointer(getAsOpaquePtr()); 675 } 676 677 /// getAddressSpace - Return the address space of this type. 678 inline unsigned getAddressSpace() const; 679 680 /// GCAttrTypesAttr - Returns gc attribute of this type. 681 inline Qualifiers::GC getObjCGCAttr() const; 682 683 /// isObjCGCWeak true when Type is objc's weak. 684 bool isObjCGCWeak() const { 685 return getObjCGCAttr() == Qualifiers::Weak; 686 } 687 688 /// isObjCGCStrong true when Type is objc's strong. 689 bool isObjCGCStrong() const { 690 return getObjCGCAttr() == Qualifiers::Strong; 691 } 692 693private: 694 // These methods are implemented in a separate translation unit; 695 // "static"-ize them to avoid creating temporary QualTypes in the 696 // caller. 697 static bool isConstant(QualType T, ASTContext& Ctx); 698 static QualType getDesugaredType(QualType T); 699}; 700 701} // end clang. 702 703namespace llvm { 704/// Implement simplify_type for QualType, so that we can dyn_cast from QualType 705/// to a specific Type class. 706template<> struct simplify_type<const ::clang::QualType> { 707 typedef ::clang::Type* SimpleType; 708 static SimpleType getSimplifiedValue(const ::clang::QualType &Val) { 709 return Val.getTypePtr(); 710 } 711}; 712template<> struct simplify_type< ::clang::QualType> 713 : public simplify_type<const ::clang::QualType> {}; 714 715// Teach SmallPtrSet that QualType is "basically a pointer". 716template<> 717class PointerLikeTypeTraits<clang::QualType> { 718public: 719 static inline void *getAsVoidPointer(clang::QualType P) { 720 return P.getAsOpaquePtr(); 721 } 722 static inline clang::QualType getFromVoidPointer(void *P) { 723 return clang::QualType::getFromOpaquePtr(P); 724 } 725 // Various qualifiers go in low bits. 726 enum { NumLowBitsAvailable = 0 }; 727}; 728 729} // end namespace llvm 730 731namespace clang { 732 733/// Type - This is the base class of the type hierarchy. A central concept 734/// with types is that each type always has a canonical type. A canonical type 735/// is the type with any typedef names stripped out of it or the types it 736/// references. For example, consider: 737/// 738/// typedef int foo; 739/// typedef foo* bar; 740/// 'int *' 'foo *' 'bar' 741/// 742/// There will be a Type object created for 'int'. Since int is canonical, its 743/// canonicaltype pointer points to itself. There is also a Type for 'foo' (a 744/// TypedefType). Its CanonicalType pointer points to the 'int' Type. Next 745/// there is a PointerType that represents 'int*', which, like 'int', is 746/// canonical. Finally, there is a PointerType type for 'foo*' whose canonical 747/// type is 'int*', and there is a TypedefType for 'bar', whose canonical type 748/// is also 'int*'. 749/// 750/// Non-canonical types are useful for emitting diagnostics, without losing 751/// information about typedefs being used. Canonical types are useful for type 752/// comparisons (they allow by-pointer equality tests) and useful for reasoning 753/// about whether something has a particular form (e.g. is a function type), 754/// because they implicitly, recursively, strip all typedefs out of a type. 755/// 756/// Types, once created, are immutable. 757/// 758class Type { 759public: 760 enum TypeClass { 761#define TYPE(Class, Base) Class, 762#define LAST_TYPE(Class) TypeLast = Class, 763#define ABSTRACT_TYPE(Class, Base) 764#include "clang/AST/TypeNodes.def" 765 TagFirst = Record, TagLast = Enum 766 }; 767 768private: 769 Type(const Type&); // DO NOT IMPLEMENT. 770 void operator=(const Type&); // DO NOT IMPLEMENT. 771 772 QualType CanonicalType; 773 774 /// TypeClass bitfield - Enum that specifies what subclass this belongs to. 775 unsigned TC : 8; 776 777 /// Dependent - Whether this type is a dependent type (C++ [temp.dep.type]). 778 /// Note that this should stay at the end of the ivars for Type so that 779 /// subclasses can pack their bitfields into the same word. 780 bool Dependent : 1; 781 782 /// \brief Whether the linkage of this type is already known. 783 mutable bool LinkageKnown : 1; 784 785 /// \brief Linkage of this type. 786 mutable unsigned CachedLinkage : 2; 787 788protected: 789 /// \brief Compute the linkage of this type. 790 virtual Linkage getLinkageImpl() const; 791 792 enum { BitsRemainingInType = 20 }; 793 794 // silence VC++ warning C4355: 'this' : used in base member initializer list 795 Type *this_() { return this; } 796 Type(TypeClass tc, QualType Canonical, bool dependent) 797 : CanonicalType(Canonical.isNull() ? QualType(this_(), 0) : Canonical), 798 TC(tc), Dependent(dependent), LinkageKnown(false), 799 CachedLinkage(NoLinkage) {} 800 virtual ~Type() {} 801 virtual void Destroy(ASTContext& C); 802 friend class ASTContext; 803 804public: 805 TypeClass getTypeClass() const { return static_cast<TypeClass>(TC); } 806 807 bool isCanonicalUnqualified() const { 808 return CanonicalType.getTypePtr() == this; 809 } 810 811 /// Types are partitioned into 3 broad categories (C99 6.2.5p1): 812 /// object types, function types, and incomplete types. 813 814 /// \brief Determines whether the type describes an object in memory. 815 /// 816 /// Note that this definition of object type corresponds to the C++ 817 /// definition of object type, which includes incomplete types, as 818 /// opposed to the C definition (which does not include incomplete 819 /// types). 820 bool isObjectType() const; 821 822 /// isIncompleteType - Return true if this is an incomplete type. 823 /// A type that can describe objects, but which lacks information needed to 824 /// determine its size (e.g. void, or a fwd declared struct). Clients of this 825 /// routine will need to determine if the size is actually required. 826 bool isIncompleteType() const; 827 828 /// isIncompleteOrObjectType - Return true if this is an incomplete or object 829 /// type, in other words, not a function type. 830 bool isIncompleteOrObjectType() const { 831 return !isFunctionType(); 832 } 833 834 /// isPODType - Return true if this is a plain-old-data type (C++ 3.9p10). 835 bool isPODType() const; 836 837 /// isLiteralType - Return true if this is a literal type 838 /// (C++0x [basic.types]p10) 839 bool isLiteralType() const; 840 841 /// isVariablyModifiedType (C99 6.7.5.2p2) - Return true for variable array 842 /// types that have a non-constant expression. This does not include "[]". 843 bool isVariablyModifiedType() const; 844 845 /// Helper methods to distinguish type categories. All type predicates 846 /// operate on the canonical type, ignoring typedefs and qualifiers. 847 848 /// isBuiltinType - returns true if the type is a builtin type. 849 bool isBuiltinType() const; 850 851 /// isSpecificBuiltinType - Test for a particular builtin type. 852 bool isSpecificBuiltinType(unsigned K) const; 853 854 /// isIntegerType() does *not* include complex integers (a GCC extension). 855 /// isComplexIntegerType() can be used to test for complex integers. 856 bool isIntegerType() const; // C99 6.2.5p17 (int, char, bool, enum) 857 bool isEnumeralType() const; 858 bool isBooleanType() const; 859 bool isCharType() const; 860 bool isWideCharType() const; 861 bool isAnyCharacterType() const; 862 bool isIntegralType(ASTContext &Ctx) const; 863 864 /// \brief Determine whether this type is an integral or enumeration type. 865 bool isIntegralOrEnumerationType() const; 866 867 /// Floating point categories. 868 bool isRealFloatingType() const; // C99 6.2.5p10 (float, double, long double) 869 /// isComplexType() does *not* include complex integers (a GCC extension). 870 /// isComplexIntegerType() can be used to test for complex integers. 871 bool isComplexType() const; // C99 6.2.5p11 (complex) 872 bool isAnyComplexType() const; // C99 6.2.5p11 (complex) + Complex Int. 873 bool isFloatingType() const; // C99 6.2.5p11 (real floating + complex) 874 bool isRealType() const; // C99 6.2.5p17 (real floating + integer) 875 bool isArithmeticType() const; // C99 6.2.5p18 (integer + floating) 876 bool isVoidType() const; // C99 6.2.5p19 877 bool isDerivedType() const; // C99 6.2.5p20 878 bool isScalarType() const; // C99 6.2.5p21 (arithmetic + pointers) 879 bool isAggregateType() const; 880 881 // Type Predicates: Check to see if this type is structurally the specified 882 // type, ignoring typedefs and qualifiers. 883 bool isFunctionType() const; 884 bool isFunctionNoProtoType() const { return getAs<FunctionNoProtoType>(); } 885 bool isFunctionProtoType() const { return getAs<FunctionProtoType>(); } 886 bool isPointerType() const; 887 bool isAnyPointerType() const; // Any C pointer or ObjC object pointer 888 bool isBlockPointerType() const; 889 bool isVoidPointerType() const; 890 bool isReferenceType() const; 891 bool isLValueReferenceType() const; 892 bool isRValueReferenceType() const; 893 bool isFunctionPointerType() const; 894 bool isMemberPointerType() const; 895 bool isMemberFunctionPointerType() const; 896 bool isArrayType() const; 897 bool isConstantArrayType() const; 898 bool isIncompleteArrayType() const; 899 bool isVariableArrayType() const; 900 bool isDependentSizedArrayType() const; 901 bool isRecordType() const; 902 bool isClassType() const; 903 bool isStructureType() const; 904 bool isStructureOrClassType() const; 905 bool isUnionType() const; 906 bool isComplexIntegerType() const; // GCC _Complex integer type. 907 bool isVectorType() const; // GCC vector type. 908 bool isExtVectorType() const; // Extended vector type. 909 bool isObjCObjectPointerType() const; // Pointer to *any* ObjC object. 910 // FIXME: change this to 'raw' interface type, so we can used 'interface' type 911 // for the common case. 912 bool isObjCObjectType() const; // NSString or typeof(*(id)0) 913 bool isObjCQualifiedInterfaceType() const; // NSString<foo> 914 bool isObjCQualifiedIdType() const; // id<foo> 915 bool isObjCQualifiedClassType() const; // Class<foo> 916 bool isObjCIdType() const; // id 917 bool isObjCClassType() const; // Class 918 bool isObjCSelType() const; // Class 919 bool isObjCBuiltinType() const; // 'id' or 'Class' 920 bool isTemplateTypeParmType() const; // C++ template type parameter 921 bool isNullPtrType() const; // C++0x nullptr_t 922 923 /// isDependentType - Whether this type is a dependent type, meaning 924 /// that its definition somehow depends on a template parameter 925 /// (C++ [temp.dep.type]). 926 bool isDependentType() const { return Dependent; } 927 bool isOverloadableType() const; 928 929 /// \brief Determine wither this type is a C++ elaborated-type-specifier. 930 bool isElaboratedTypeSpecifier() const; 931 932 /// hasPointerRepresentation - Whether this type is represented 933 /// natively as a pointer; this includes pointers, references, block 934 /// pointers, and Objective-C interface, qualified id, and qualified 935 /// interface types, as well as nullptr_t. 936 bool hasPointerRepresentation() const; 937 938 /// hasObjCPointerRepresentation - Whether this type can represent 939 /// an objective pointer type for the purpose of GC'ability 940 bool hasObjCPointerRepresentation() const; 941 942 /// \brief Determine whether this type has a floating-point representation 943 /// of some sort, e.g., it is a floating-point type or a vector thereof. 944 bool hasFloatingRepresentation() const; 945 946 // Type Checking Functions: Check to see if this type is structurally the 947 // specified type, ignoring typedefs and qualifiers, and return a pointer to 948 // the best type we can. 949 const RecordType *getAsStructureType() const; 950 /// NOTE: getAs*ArrayType are methods on ASTContext. 951 const RecordType *getAsUnionType() const; 952 const ComplexType *getAsComplexIntegerType() const; // GCC complex int type. 953 // The following is a convenience method that returns an ObjCObjectPointerType 954 // for object declared using an interface. 955 const ObjCObjectPointerType *getAsObjCInterfacePointerType() const; 956 const ObjCObjectPointerType *getAsObjCQualifiedIdType() const; 957 const ObjCObjectType *getAsObjCQualifiedInterfaceType() const; 958 const CXXRecordDecl *getCXXRecordDeclForPointerType() const; 959 960 /// \brief Retrieves the CXXRecordDecl that this type refers to, either 961 /// because the type is a RecordType or because it is the injected-class-name 962 /// type of a class template or class template partial specialization. 963 CXXRecordDecl *getAsCXXRecordDecl() const; 964 965 // Member-template getAs<specific type>'. This scheme will eventually 966 // replace the specific getAsXXXX methods above. 967 // 968 // There are some specializations of this member template listed 969 // immediately following this class. 970 template <typename T> const T *getAs() const; 971 972 /// getArrayElementTypeNoTypeQual - If this is an array type, return the 973 /// element type of the array, potentially with type qualifiers missing. 974 /// This method should never be used when type qualifiers are meaningful. 975 const Type *getArrayElementTypeNoTypeQual() const; 976 977 /// getPointeeType - If this is a pointer, ObjC object pointer, or block 978 /// pointer, this returns the respective pointee. 979 QualType getPointeeType() const; 980 981 /// getUnqualifiedDesugaredType() - Return the specified type with 982 /// any "sugar" removed from the type, removing any typedefs, 983 /// typeofs, etc., as well as any qualifiers. 984 const Type *getUnqualifiedDesugaredType() const; 985 986 /// More type predicates useful for type checking/promotion 987 bool isPromotableIntegerType() const; // C99 6.3.1.1p2 988 989 /// isSignedIntegerType - Return true if this is an integer type that is 990 /// signed, according to C99 6.2.5p4 [char, signed char, short, int, long..], 991 /// an enum decl which has a signed representation, or a vector of signed 992 /// integer element type. 993 bool isSignedIntegerType() const; 994 995 /// isUnsignedIntegerType - Return true if this is an integer type that is 996 /// unsigned, according to C99 6.2.5p6 [which returns true for _Bool], an enum 997 /// decl which has an unsigned representation, or a vector of unsigned integer 998 /// element type. 999 bool isUnsignedIntegerType() const; 1000 1001 /// isConstantSizeType - Return true if this is not a variable sized type, 1002 /// according to the rules of C99 6.7.5p3. It is not legal to call this on 1003 /// incomplete types. 1004 bool isConstantSizeType() const; 1005 1006 /// isSpecifierType - Returns true if this type can be represented by some 1007 /// set of type specifiers. 1008 bool isSpecifierType() const; 1009 1010 /// \brief Determine the linkage of this type. 1011 Linkage getLinkage() const; 1012 1013 /// \brief Note that the linkage is no longer known. 1014 void ClearLinkageCache(); 1015 1016 const char *getTypeClassName() const; 1017 1018 QualType getCanonicalTypeInternal() const { 1019 return CanonicalType; 1020 } 1021 CanQualType getCanonicalTypeUnqualified() const; // in CanonicalType.h 1022 void dump() const; 1023 static bool classof(const Type *) { return true; } 1024 1025 friend class PCHReader; 1026 friend class PCHWriter; 1027}; 1028 1029template <> inline const TypedefType *Type::getAs() const { 1030 return dyn_cast<TypedefType>(this); 1031} 1032 1033// We can do canonical leaf types faster, because we don't have to 1034// worry about preserving child type decoration. 1035#define TYPE(Class, Base) 1036#define LEAF_TYPE(Class) \ 1037template <> inline const Class##Type *Type::getAs() const { \ 1038 return dyn_cast<Class##Type>(CanonicalType); \ 1039} 1040#include "clang/AST/TypeNodes.def" 1041 1042 1043/// BuiltinType - This class is used for builtin types like 'int'. Builtin 1044/// types are always canonical and have a literal name field. 1045class BuiltinType : public Type { 1046public: 1047 enum Kind { 1048 Void, 1049 1050 Bool, // This is bool and/or _Bool. 1051 Char_U, // This is 'char' for targets where char is unsigned. 1052 UChar, // This is explicitly qualified unsigned char. 1053 Char16, // This is 'char16_t' for C++. 1054 Char32, // This is 'char32_t' for C++. 1055 UShort, 1056 UInt, 1057 ULong, 1058 ULongLong, 1059 UInt128, // __uint128_t 1060 1061 Char_S, // This is 'char' for targets where char is signed. 1062 SChar, // This is explicitly qualified signed char. 1063 WChar, // This is 'wchar_t' for C++. 1064 Short, 1065 Int, 1066 Long, 1067 LongLong, 1068 Int128, // __int128_t 1069 1070 Float, Double, LongDouble, 1071 1072 NullPtr, // This is the type of C++0x 'nullptr'. 1073 1074 Overload, // This represents the type of an overloaded function declaration. 1075 Dependent, // This represents the type of a type-dependent expression. 1076 1077 UndeducedAuto, // In C++0x, this represents the type of an auto variable 1078 // that has not been deduced yet. 1079 1080 /// The primitive Objective C 'id' type. The type pointed to by the 1081 /// user-visible 'id' type. Only ever shows up in an AST as the base 1082 /// type of an ObjCObjectType. 1083 ObjCId, 1084 1085 /// The primitive Objective C 'Class' type. The type pointed to by the 1086 /// user-visible 'Class' type. Only ever shows up in an AST as the 1087 /// base type of an ObjCObjectType. 1088 ObjCClass, 1089 1090 ObjCSel // This represents the ObjC 'SEL' type. 1091 }; 1092private: 1093 Kind TypeKind; 1094 1095protected: 1096 virtual Linkage getLinkageImpl() const; 1097 1098public: 1099 BuiltinType(Kind K) 1100 : Type(Builtin, QualType(), /*Dependent=*/(K == Dependent)), 1101 TypeKind(K) {} 1102 1103 Kind getKind() const { return TypeKind; } 1104 const char *getName(const LangOptions &LO) const; 1105 1106 bool isSugared() const { return false; } 1107 QualType desugar() const { return QualType(this, 0); } 1108 1109 bool isInteger() const { 1110 return TypeKind >= Bool && TypeKind <= Int128; 1111 } 1112 1113 bool isSignedInteger() const { 1114 return TypeKind >= Char_S && TypeKind <= Int128; 1115 } 1116 1117 bool isUnsignedInteger() const { 1118 return TypeKind >= Bool && TypeKind <= UInt128; 1119 } 1120 1121 bool isFloatingPoint() const { 1122 return TypeKind >= Float && TypeKind <= LongDouble; 1123 } 1124 1125 static bool classof(const Type *T) { return T->getTypeClass() == Builtin; } 1126 static bool classof(const BuiltinType *) { return true; } 1127}; 1128 1129/// ComplexType - C99 6.2.5p11 - Complex values. This supports the C99 complex 1130/// types (_Complex float etc) as well as the GCC integer complex extensions. 1131/// 1132class ComplexType : public Type, public llvm::FoldingSetNode { 1133 QualType ElementType; 1134 ComplexType(QualType Element, QualType CanonicalPtr) : 1135 Type(Complex, CanonicalPtr, Element->isDependentType()), 1136 ElementType(Element) { 1137 } 1138 friend class ASTContext; // ASTContext creates these. 1139 1140protected: 1141 virtual Linkage getLinkageImpl() const; 1142 1143public: 1144 QualType getElementType() const { return ElementType; } 1145 1146 bool isSugared() const { return false; } 1147 QualType desugar() const { return QualType(this, 0); } 1148 1149 void Profile(llvm::FoldingSetNodeID &ID) { 1150 Profile(ID, getElementType()); 1151 } 1152 static void Profile(llvm::FoldingSetNodeID &ID, QualType Element) { 1153 ID.AddPointer(Element.getAsOpaquePtr()); 1154 } 1155 1156 static bool classof(const Type *T) { return T->getTypeClass() == Complex; } 1157 static bool classof(const ComplexType *) { return true; } 1158}; 1159 1160/// PointerType - C99 6.7.5.1 - Pointer Declarators. 1161/// 1162class PointerType : public Type, public llvm::FoldingSetNode { 1163 QualType PointeeType; 1164 1165 PointerType(QualType Pointee, QualType CanonicalPtr) : 1166 Type(Pointer, CanonicalPtr, Pointee->isDependentType()), PointeeType(Pointee) { 1167 } 1168 friend class ASTContext; // ASTContext creates these. 1169 1170protected: 1171 virtual Linkage getLinkageImpl() const; 1172 1173public: 1174 1175 QualType getPointeeType() const { return PointeeType; } 1176 1177 bool isSugared() const { return false; } 1178 QualType desugar() const { return QualType(this, 0); } 1179 1180 void Profile(llvm::FoldingSetNodeID &ID) { 1181 Profile(ID, getPointeeType()); 1182 } 1183 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee) { 1184 ID.AddPointer(Pointee.getAsOpaquePtr()); 1185 } 1186 1187 static bool classof(const Type *T) { return T->getTypeClass() == Pointer; } 1188 static bool classof(const PointerType *) { return true; } 1189}; 1190 1191/// BlockPointerType - pointer to a block type. 1192/// This type is to represent types syntactically represented as 1193/// "void (^)(int)", etc. Pointee is required to always be a function type. 1194/// 1195class BlockPointerType : public Type, public llvm::FoldingSetNode { 1196 QualType PointeeType; // Block is some kind of pointer type 1197 BlockPointerType(QualType Pointee, QualType CanonicalCls) : 1198 Type(BlockPointer, CanonicalCls, Pointee->isDependentType()), 1199 PointeeType(Pointee) { 1200 } 1201 friend class ASTContext; // ASTContext creates these. 1202 1203protected: 1204 virtual Linkage getLinkageImpl() const; 1205 1206public: 1207 1208 // Get the pointee type. Pointee is required to always be a function type. 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) { 1222 return T->getTypeClass() == BlockPointer; 1223 } 1224 static bool classof(const BlockPointerType *) { return true; } 1225}; 1226 1227/// ReferenceType - Base for LValueReferenceType and RValueReferenceType 1228/// 1229class ReferenceType : public Type, public llvm::FoldingSetNode { 1230 QualType PointeeType; 1231 1232 /// True if the type was originally spelled with an lvalue sigil. 1233 /// This is never true of rvalue references but can also be false 1234 /// on lvalue references because of C++0x [dcl.typedef]p9, 1235 /// as follows: 1236 /// 1237 /// typedef int &ref; // lvalue, spelled lvalue 1238 /// typedef int &&rvref; // rvalue 1239 /// ref &a; // lvalue, inner ref, spelled lvalue 1240 /// ref &&a; // lvalue, inner ref 1241 /// rvref &a; // lvalue, inner ref, spelled lvalue 1242 /// rvref &&a; // rvalue, inner ref 1243 bool SpelledAsLValue; 1244 1245 /// True if the inner type is a reference type. This only happens 1246 /// in non-canonical forms. 1247 bool InnerRef; 1248 1249protected: 1250 ReferenceType(TypeClass tc, QualType Referencee, QualType CanonicalRef, 1251 bool SpelledAsLValue) : 1252 Type(tc, CanonicalRef, Referencee->isDependentType()), 1253 PointeeType(Referencee), SpelledAsLValue(SpelledAsLValue), 1254 InnerRef(Referencee->isReferenceType()) { 1255 } 1256 1257 virtual Linkage getLinkageImpl() const; 1258 1259public: 1260 bool isSpelledAsLValue() const { return SpelledAsLValue; } 1261 bool isInnerRef() const { return InnerRef; } 1262 1263 QualType getPointeeTypeAsWritten() const { return PointeeType; } 1264 QualType getPointeeType() const { 1265 // FIXME: this might strip inner qualifiers; okay? 1266 const ReferenceType *T = this; 1267 while (T->InnerRef) 1268 T = T->PointeeType->getAs<ReferenceType>(); 1269 return T->PointeeType; 1270 } 1271 1272 void Profile(llvm::FoldingSetNodeID &ID) { 1273 Profile(ID, PointeeType, SpelledAsLValue); 1274 } 1275 static void Profile(llvm::FoldingSetNodeID &ID, 1276 QualType Referencee, 1277 bool SpelledAsLValue) { 1278 ID.AddPointer(Referencee.getAsOpaquePtr()); 1279 ID.AddBoolean(SpelledAsLValue); 1280 } 1281 1282 static bool classof(const Type *T) { 1283 return T->getTypeClass() == LValueReference || 1284 T->getTypeClass() == RValueReference; 1285 } 1286 static bool classof(const ReferenceType *) { return true; } 1287}; 1288 1289/// LValueReferenceType - C++ [dcl.ref] - Lvalue reference 1290/// 1291class LValueReferenceType : public ReferenceType { 1292 LValueReferenceType(QualType Referencee, QualType CanonicalRef, 1293 bool SpelledAsLValue) : 1294 ReferenceType(LValueReference, Referencee, CanonicalRef, SpelledAsLValue) 1295 {} 1296 friend class ASTContext; // ASTContext creates these 1297public: 1298 bool isSugared() const { return false; } 1299 QualType desugar() const { return QualType(this, 0); } 1300 1301 static bool classof(const Type *T) { 1302 return T->getTypeClass() == LValueReference; 1303 } 1304 static bool classof(const LValueReferenceType *) { return true; } 1305}; 1306 1307/// RValueReferenceType - C++0x [dcl.ref] - Rvalue reference 1308/// 1309class RValueReferenceType : public ReferenceType { 1310 RValueReferenceType(QualType Referencee, QualType CanonicalRef) : 1311 ReferenceType(RValueReference, Referencee, CanonicalRef, false) { 1312 } 1313 friend class ASTContext; // ASTContext creates these 1314public: 1315 bool isSugared() const { return false; } 1316 QualType desugar() const { return QualType(this, 0); } 1317 1318 static bool classof(const Type *T) { 1319 return T->getTypeClass() == RValueReference; 1320 } 1321 static bool classof(const RValueReferenceType *) { return true; } 1322}; 1323 1324/// MemberPointerType - C++ 8.3.3 - Pointers to members 1325/// 1326class MemberPointerType : public Type, public llvm::FoldingSetNode { 1327 QualType PointeeType; 1328 /// The class of which the pointee is a member. Must ultimately be a 1329 /// RecordType, but could be a typedef or a template parameter too. 1330 const Type *Class; 1331 1332 MemberPointerType(QualType Pointee, const Type *Cls, QualType CanonicalPtr) : 1333 Type(MemberPointer, CanonicalPtr, 1334 Cls->isDependentType() || Pointee->isDependentType()), 1335 PointeeType(Pointee), Class(Cls) { 1336 } 1337 friend class ASTContext; // ASTContext creates these. 1338 1339protected: 1340 virtual Linkage getLinkageImpl() const; 1341 1342public: 1343 1344 QualType getPointeeType() const { return PointeeType; } 1345 1346 const Type *getClass() const { return Class; } 1347 1348 bool isSugared() const { return false; } 1349 QualType desugar() const { return QualType(this, 0); } 1350 1351 void Profile(llvm::FoldingSetNodeID &ID) { 1352 Profile(ID, getPointeeType(), getClass()); 1353 } 1354 static void Profile(llvm::FoldingSetNodeID &ID, QualType Pointee, 1355 const Type *Class) { 1356 ID.AddPointer(Pointee.getAsOpaquePtr()); 1357 ID.AddPointer(Class); 1358 } 1359 1360 static bool classof(const Type *T) { 1361 return T->getTypeClass() == MemberPointer; 1362 } 1363 static bool classof(const MemberPointerType *) { return true; } 1364}; 1365 1366/// ArrayType - C99 6.7.5.2 - Array Declarators. 1367/// 1368class ArrayType : public Type, public llvm::FoldingSetNode { 1369public: 1370 /// ArraySizeModifier - Capture whether this is a normal array (e.g. int X[4]) 1371 /// an array with a static size (e.g. int X[static 4]), or an array 1372 /// with a star size (e.g. int X[*]). 1373 /// 'static' is only allowed on function parameters. 1374 enum ArraySizeModifier { 1375 Normal, Static, Star 1376 }; 1377private: 1378 /// ElementType - The element type of the array. 1379 QualType ElementType; 1380 1381 // NOTE: VC++ treats enums as signed, avoid using the ArraySizeModifier enum 1382 /// NOTE: These fields are packed into the bitfields space in the Type class. 1383 unsigned SizeModifier : 2; 1384 1385 /// IndexTypeQuals - Capture qualifiers in declarations like: 1386 /// 'int X[static restrict 4]'. For function parameters only. 1387 unsigned IndexTypeQuals : 3; 1388 1389protected: 1390 // C++ [temp.dep.type]p1: 1391 // A type is dependent if it is... 1392 // - an array type constructed from any dependent type or whose 1393 // size is specified by a constant expression that is 1394 // value-dependent, 1395 ArrayType(TypeClass tc, QualType et, QualType can, 1396 ArraySizeModifier sm, unsigned tq) 1397 : Type(tc, can, et->isDependentType() || tc == DependentSizedArray), 1398 ElementType(et), SizeModifier(sm), IndexTypeQuals(tq) {} 1399 1400 friend class ASTContext; // ASTContext creates these. 1401 1402 virtual Linkage getLinkageImpl() const; 1403 1404public: 1405 QualType getElementType() const { return ElementType; } 1406 ArraySizeModifier getSizeModifier() const { 1407 return ArraySizeModifier(SizeModifier); 1408 } 1409 Qualifiers getIndexTypeQualifiers() const { 1410 return Qualifiers::fromCVRMask(IndexTypeQuals); 1411 } 1412 unsigned getIndexTypeCVRQualifiers() const { return IndexTypeQuals; } 1413 1414 static bool classof(const Type *T) { 1415 return T->getTypeClass() == ConstantArray || 1416 T->getTypeClass() == VariableArray || 1417 T->getTypeClass() == IncompleteArray || 1418 T->getTypeClass() == DependentSizedArray; 1419 } 1420 static bool classof(const ArrayType *) { return true; } 1421}; 1422 1423/// ConstantArrayType - This class represents the canonical version of 1424/// C arrays with a specified constant size. For example, the canonical 1425/// type for 'int A[4 + 4*100]' is a ConstantArrayType where the element 1426/// type is 'int' and the size is 404. 1427class ConstantArrayType : public ArrayType { 1428 llvm::APInt Size; // Allows us to unique the type. 1429 1430 ConstantArrayType(QualType et, QualType can, const llvm::APInt &size, 1431 ArraySizeModifier sm, unsigned tq) 1432 : ArrayType(ConstantArray, et, can, sm, tq), 1433 Size(size) {} 1434protected: 1435 ConstantArrayType(TypeClass tc, QualType et, QualType can, 1436 const llvm::APInt &size, ArraySizeModifier sm, unsigned tq) 1437 : ArrayType(tc, et, can, sm, tq), Size(size) {} 1438 friend class ASTContext; // ASTContext creates these. 1439public: 1440 const llvm::APInt &getSize() const { return Size; } 1441 bool isSugared() const { return false; } 1442 QualType desugar() const { return QualType(this, 0); } 1443 1444 void Profile(llvm::FoldingSetNodeID &ID) { 1445 Profile(ID, getElementType(), getSize(), 1446 getSizeModifier(), getIndexTypeCVRQualifiers()); 1447 } 1448 static void Profile(llvm::FoldingSetNodeID &ID, QualType ET, 1449 const llvm::APInt &ArraySize, ArraySizeModifier SizeMod, 1450 unsigned TypeQuals) { 1451 ID.AddPointer(ET.getAsOpaquePtr()); 1452 ID.AddInteger(ArraySize.getZExtValue()); 1453 ID.AddInteger(SizeMod); 1454 ID.AddInteger(TypeQuals); 1455 } 1456 static bool classof(const Type *T) { 1457 return T->getTypeClass() == ConstantArray; 1458 } 1459 static bool classof(const ConstantArrayType *) { return true; } 1460}; 1461 1462/// IncompleteArrayType - This class represents C arrays with an unspecified 1463/// size. For example 'int A[]' has an IncompleteArrayType where the element 1464/// type is 'int' and the size is unspecified. 1465class IncompleteArrayType : public ArrayType { 1466 1467 IncompleteArrayType(QualType et, QualType can, 1468 ArraySizeModifier sm, unsigned tq) 1469 : ArrayType(IncompleteArray, et, can, sm, tq) {} 1470 friend class ASTContext; // ASTContext creates these. 1471public: 1472 bool isSugared() const { return false; } 1473 QualType desugar() const { return QualType(this, 0); } 1474 1475 static bool classof(const Type *T) { 1476 return T->getTypeClass() == IncompleteArray; 1477 } 1478 static bool classof(const IncompleteArrayType *) { return true; } 1479 1480 friend class StmtIteratorBase; 1481 1482 void Profile(llvm::FoldingSetNodeID &ID) { 1483 Profile(ID, getElementType(), getSizeModifier(), 1484 getIndexTypeCVRQualifiers()); 1485 } 1486 1487 static void Profile(llvm::FoldingSetNodeID &ID, QualType ET, 1488 ArraySizeModifier SizeMod, unsigned TypeQuals) { 1489 ID.AddPointer(ET.getAsOpaquePtr()); 1490 ID.AddInteger(SizeMod); 1491 ID.AddInteger(TypeQuals); 1492 } 1493}; 1494 1495/// VariableArrayType - This class represents C arrays with a specified size 1496/// which is not an integer-constant-expression. For example, 'int s[x+foo()]'. 1497/// Since the size expression is an arbitrary expression, we store it as such. 1498/// 1499/// Note: VariableArrayType's aren't uniqued (since the expressions aren't) and 1500/// should not be: two lexically equivalent variable array types could mean 1501/// different things, for example, these variables do not have the same type 1502/// dynamically: 1503/// 1504/// void foo(int x) { 1505/// int Y[x]; 1506/// ++x; 1507/// int Z[x]; 1508/// } 1509/// 1510class VariableArrayType : public ArrayType { 1511 /// SizeExpr - An assignment expression. VLA's are only permitted within 1512 /// a function block. 1513 Stmt *SizeExpr; 1514 /// Brackets - The left and right array brackets. 1515 SourceRange Brackets; 1516 1517 VariableArrayType(QualType et, QualType can, Expr *e, 1518 ArraySizeModifier sm, unsigned tq, 1519 SourceRange brackets) 1520 : ArrayType(VariableArray, et, can, sm, tq), 1521 SizeExpr((Stmt*) e), Brackets(brackets) {} 1522 friend class ASTContext; // ASTContext creates these. 1523 virtual void Destroy(ASTContext& C); 1524 1525public: 1526 Expr *getSizeExpr() const { 1527 // We use C-style casts instead of cast<> here because we do not wish 1528 // to have a dependency of Type.h on Stmt.h/Expr.h. 1529 return (Expr*) SizeExpr; 1530 } 1531 SourceRange getBracketsRange() const { return Brackets; } 1532 SourceLocation getLBracketLoc() const { return Brackets.getBegin(); } 1533 SourceLocation getRBracketLoc() const { return Brackets.getEnd(); } 1534 1535 bool isSugared() const { return false; } 1536 QualType desugar() const { return QualType(this, 0); } 1537 1538 static bool classof(const Type *T) { 1539 return T->getTypeClass() == VariableArray; 1540 } 1541 static bool classof(const VariableArrayType *) { return true; } 1542 1543 friend class StmtIteratorBase; 1544 1545 void Profile(llvm::FoldingSetNodeID &ID) { 1546 assert(0 && "Cannnot unique VariableArrayTypes."); 1547 } 1548}; 1549 1550/// DependentSizedArrayType - This type represents an array type in 1551/// C++ whose size is a value-dependent expression. For example: 1552/// 1553/// \code 1554/// template<typename T, int Size> 1555/// class array { 1556/// T data[Size]; 1557/// }; 1558/// \endcode 1559/// 1560/// For these types, we won't actually know what the array bound is 1561/// until template instantiation occurs, at which point this will 1562/// become either a ConstantArrayType or a VariableArrayType. 1563class DependentSizedArrayType : public ArrayType { 1564 ASTContext &Context; 1565 1566 /// \brief An assignment expression that will instantiate to the 1567 /// size of the array. 1568 /// 1569 /// The expression itself might be NULL, in which case the array 1570 /// type will have its size deduced from an initializer. 1571 Stmt *SizeExpr; 1572 1573 /// Brackets - The left and right array brackets. 1574 SourceRange Brackets; 1575 1576 DependentSizedArrayType(ASTContext &Context, QualType et, QualType can, 1577 Expr *e, ArraySizeModifier sm, unsigned tq, 1578 SourceRange brackets) 1579 : ArrayType(DependentSizedArray, et, can, sm, tq), 1580 Context(Context), SizeExpr((Stmt*) e), Brackets(brackets) {} 1581 friend class ASTContext; // ASTContext creates these. 1582 virtual void Destroy(ASTContext& C); 1583 1584public: 1585 Expr *getSizeExpr() const { 1586 // We use C-style casts instead of cast<> here because we do not wish 1587 // to have a dependency of Type.h on Stmt.h/Expr.h. 1588 return (Expr*) SizeExpr; 1589 } 1590 SourceRange getBracketsRange() const { return Brackets; } 1591 SourceLocation getLBracketLoc() const { return Brackets.getBegin(); } 1592 SourceLocation getRBracketLoc() const { return Brackets.getEnd(); } 1593 1594 bool isSugared() const { return false; } 1595 QualType desugar() const { return QualType(this, 0); } 1596 1597 static bool classof(const Type *T) { 1598 return T->getTypeClass() == DependentSizedArray; 1599 } 1600 static bool classof(const DependentSizedArrayType *) { return true; } 1601 1602 friend class StmtIteratorBase; 1603 1604 1605 void Profile(llvm::FoldingSetNodeID &ID) { 1606 Profile(ID, Context, getElementType(), 1607 getSizeModifier(), getIndexTypeCVRQualifiers(), getSizeExpr()); 1608 } 1609 1610 static void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context, 1611 QualType ET, ArraySizeModifier SizeMod, 1612 unsigned TypeQuals, Expr *E); 1613}; 1614 1615/// DependentSizedExtVectorType - This type represent an extended vector type 1616/// where either the type or size is dependent. For example: 1617/// @code 1618/// template<typename T, int Size> 1619/// class vector { 1620/// typedef T __attribute__((ext_vector_type(Size))) type; 1621/// } 1622/// @endcode 1623class DependentSizedExtVectorType : public Type, public llvm::FoldingSetNode { 1624 ASTContext &Context; 1625 Expr *SizeExpr; 1626 /// ElementType - The element type of the array. 1627 QualType ElementType; 1628 SourceLocation loc; 1629 1630 DependentSizedExtVectorType(ASTContext &Context, QualType ElementType, 1631 QualType can, Expr *SizeExpr, SourceLocation loc) 1632 : Type (DependentSizedExtVector, can, true), 1633 Context(Context), SizeExpr(SizeExpr), ElementType(ElementType), 1634 loc(loc) {} 1635 friend class ASTContext; 1636 virtual void Destroy(ASTContext& C); 1637 1638public: 1639 Expr *getSizeExpr() const { return SizeExpr; } 1640 QualType getElementType() const { return ElementType; } 1641 SourceLocation getAttributeLoc() const { return loc; } 1642 1643 bool isSugared() const { return false; } 1644 QualType desugar() const { return QualType(this, 0); } 1645 1646 static bool classof(const Type *T) { 1647 return T->getTypeClass() == DependentSizedExtVector; 1648 } 1649 static bool classof(const DependentSizedExtVectorType *) { return true; } 1650 1651 void Profile(llvm::FoldingSetNodeID &ID) { 1652 Profile(ID, Context, getElementType(), getSizeExpr()); 1653 } 1654 1655 static void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context, 1656 QualType ElementType, Expr *SizeExpr); 1657}; 1658 1659 1660/// VectorType - GCC generic vector type. This type is created using 1661/// __attribute__((vector_size(n)), where "n" specifies the vector size in 1662/// bytes; or from an Altivec __vector or vector declaration. 1663/// Since the constructor takes the number of vector elements, the 1664/// client is responsible for converting the size into the number of elements. 1665class VectorType : public Type, public llvm::FoldingSetNode { 1666public: 1667 enum AltiVecSpecific { 1668 NotAltiVec, // is not AltiVec vector 1669 AltiVec, // is AltiVec vector 1670 Pixel, // is AltiVec 'vector Pixel' 1671 Bool // is AltiVec 'vector bool ...' 1672 }; 1673protected: 1674 /// ElementType - The element type of the vector. 1675 QualType ElementType; 1676 1677 /// NumElements - The number of elements in the vector. 1678 unsigned NumElements; 1679 1680 AltiVecSpecific AltiVecSpec; 1681 1682 VectorType(QualType vecType, unsigned nElements, QualType canonType, 1683 AltiVecSpecific altiVecSpec) : 1684 Type(Vector, canonType, vecType->isDependentType()), 1685 ElementType(vecType), NumElements(nElements), AltiVecSpec(altiVecSpec) {} 1686 VectorType(TypeClass tc, QualType vecType, unsigned nElements, 1687 QualType canonType, AltiVecSpecific altiVecSpec) 1688 : Type(tc, canonType, vecType->isDependentType()), ElementType(vecType), 1689 NumElements(nElements), AltiVecSpec(altiVecSpec) {} 1690 friend class ASTContext; // ASTContext creates these. 1691 1692 virtual Linkage getLinkageImpl() const; 1693 1694public: 1695 1696 QualType getElementType() const { return ElementType; } 1697 unsigned getNumElements() const { return NumElements; } 1698 1699 bool isSugared() const { return false; } 1700 QualType desugar() const { return QualType(this, 0); } 1701 1702 AltiVecSpecific getAltiVecSpecific() const { return AltiVecSpec; } 1703 1704 void Profile(llvm::FoldingSetNodeID &ID) { 1705 Profile(ID, getElementType(), getNumElements(), getTypeClass(), AltiVecSpec); 1706 } 1707 static void Profile(llvm::FoldingSetNodeID &ID, QualType ElementType, 1708 unsigned NumElements, TypeClass TypeClass, 1709 unsigned AltiVecSpec) { 1710 ID.AddPointer(ElementType.getAsOpaquePtr()); 1711 ID.AddInteger(NumElements); 1712 ID.AddInteger(TypeClass); 1713 ID.AddInteger(AltiVecSpec); 1714 } 1715 1716 static bool classof(const Type *T) { 1717 return T->getTypeClass() == Vector || T->getTypeClass() == ExtVector; 1718 } 1719 static bool classof(const VectorType *) { return true; } 1720}; 1721 1722/// ExtVectorType - Extended vector type. This type is created using 1723/// __attribute__((ext_vector_type(n)), where "n" is the number of elements. 1724/// Unlike vector_size, ext_vector_type is only allowed on typedef's. This 1725/// class enables syntactic extensions, like Vector Components for accessing 1726/// points, colors, and textures (modeled after OpenGL Shading Language). 1727class ExtVectorType : public VectorType { 1728 ExtVectorType(QualType vecType, unsigned nElements, QualType canonType) : 1729 VectorType(ExtVector, vecType, nElements, canonType, NotAltiVec) {} 1730 friend class ASTContext; // ASTContext creates these. 1731public: 1732 static int getPointAccessorIdx(char c) { 1733 switch (c) { 1734 default: return -1; 1735 case 'x': return 0; 1736 case 'y': return 1; 1737 case 'z': return 2; 1738 case 'w': return 3; 1739 } 1740 } 1741 static int getNumericAccessorIdx(char c) { 1742 switch (c) { 1743 default: return -1; 1744 case '0': return 0; 1745 case '1': return 1; 1746 case '2': return 2; 1747 case '3': return 3; 1748 case '4': return 4; 1749 case '5': return 5; 1750 case '6': return 6; 1751 case '7': return 7; 1752 case '8': return 8; 1753 case '9': return 9; 1754 case 'A': 1755 case 'a': return 10; 1756 case 'B': 1757 case 'b': return 11; 1758 case 'C': 1759 case 'c': return 12; 1760 case 'D': 1761 case 'd': return 13; 1762 case 'E': 1763 case 'e': return 14; 1764 case 'F': 1765 case 'f': return 15; 1766 } 1767 } 1768 1769 static int getAccessorIdx(char c) { 1770 if (int idx = getPointAccessorIdx(c)+1) return idx-1; 1771 return getNumericAccessorIdx(c); 1772 } 1773 1774 bool isAccessorWithinNumElements(char c) const { 1775 if (int idx = getAccessorIdx(c)+1) 1776 return unsigned(idx-1) < NumElements; 1777 return false; 1778 } 1779 bool isSugared() const { return false; } 1780 QualType desugar() const { return QualType(this, 0); } 1781 1782 static bool classof(const Type *T) { 1783 return T->getTypeClass() == ExtVector; 1784 } 1785 static bool classof(const ExtVectorType *) { return true; } 1786}; 1787 1788/// FunctionType - C99 6.7.5.3 - Function Declarators. This is the common base 1789/// class of FunctionNoProtoType and FunctionProtoType. 1790/// 1791class FunctionType : public Type { 1792 virtual void ANCHOR(); // Key function for FunctionType. 1793 1794 /// SubClassData - This field is owned by the subclass, put here to pack 1795 /// tightly with the ivars in Type. 1796 bool SubClassData : 1; 1797 1798 /// TypeQuals - Used only by FunctionProtoType, put here to pack with the 1799 /// other bitfields. 1800 /// The qualifiers are part of FunctionProtoType because... 1801 /// 1802 /// C++ 8.3.5p4: The return type, the parameter type list and the 1803 /// cv-qualifier-seq, [...], are part of the function type. 1804 /// 1805 unsigned TypeQuals : 3; 1806 1807 /// NoReturn - Indicates if the function type is attribute noreturn. 1808 unsigned NoReturn : 1; 1809 1810 /// RegParm - How many arguments to pass inreg. 1811 unsigned RegParm : 3; 1812 1813 /// CallConv - The calling convention used by the function. 1814 unsigned CallConv : 3; 1815 1816 // The type returned by the function. 1817 QualType ResultType; 1818 1819 public: 1820 // This class is used for passing arround the information needed to 1821 // construct a call. It is not actually used for storage, just for 1822 // factoring together common arguments. 1823 // If you add a field (say Foo), other than the obvious places (both, constructors, 1824 // compile failures), what you need to update is 1825 // * Operetor== 1826 // * getFoo 1827 // * withFoo 1828 // * functionType. Add Foo, getFoo. 1829 // * ASTContext::getFooType 1830 // * ASTContext::mergeFunctionTypes 1831 // * FunctionNoProtoType::Profile 1832 // * FunctionProtoType::Profile 1833 // * TypePrinter::PrintFunctionProto 1834 // * PCH read and write 1835 // * Codegen 1836 1837 class ExtInfo { 1838 public: 1839 // Constructor with no defaults. Use this when you know that you 1840 // have all the elements (when reading a PCH file for example). 1841 ExtInfo(bool noReturn, unsigned regParm, CallingConv cc) : 1842 NoReturn(noReturn), RegParm(regParm), CC(cc) {} 1843 1844 // Constructor with all defaults. Use when for example creating a 1845 // function know to use defaults. 1846 ExtInfo() : NoReturn(false), RegParm(0), CC(CC_Default) {} 1847 1848 bool getNoReturn() const { return NoReturn; } 1849 unsigned getRegParm() const { return RegParm; } 1850 CallingConv getCC() const { return CC; } 1851 1852 bool operator==(const ExtInfo &Other) const { 1853 return getNoReturn() == Other.getNoReturn() && 1854 getRegParm() == Other.getRegParm() && 1855 getCC() == Other.getCC(); 1856 } 1857 bool operator!=(const ExtInfo &Other) const { 1858 return !(*this == Other); 1859 } 1860 1861 // Note that we don't have setters. That is by design, use 1862 // the following with methods instead of mutating these objects. 1863 1864 ExtInfo withNoReturn(bool noReturn) const { 1865 return ExtInfo(noReturn, getRegParm(), getCC()); 1866 } 1867 1868 ExtInfo withRegParm(unsigned RegParm) const { 1869 return ExtInfo(getNoReturn(), RegParm, getCC()); 1870 } 1871 1872 ExtInfo withCallingConv(CallingConv cc) const { 1873 return ExtInfo(getNoReturn(), getRegParm(), cc); 1874 } 1875 1876 private: 1877 // True if we have __attribute__((noreturn)) 1878 bool NoReturn; 1879 // The value passed to __attribute__((regparm(x))) 1880 unsigned RegParm; 1881 // The calling convention as specified via 1882 // __attribute__((cdecl|stdcall|fastcall|thiscall)) 1883 CallingConv CC; 1884 }; 1885 1886protected: 1887 FunctionType(TypeClass tc, QualType res, bool SubclassInfo, 1888 unsigned typeQuals, QualType Canonical, bool Dependent, 1889 const ExtInfo &Info) 1890 : Type(tc, Canonical, Dependent), 1891 SubClassData(SubclassInfo), TypeQuals(typeQuals), 1892 NoReturn(Info.getNoReturn()), 1893 RegParm(Info.getRegParm()), CallConv(Info.getCC()), ResultType(res) {} 1894 bool getSubClassData() const { return SubClassData; } 1895 unsigned getTypeQuals() const { return TypeQuals; } 1896public: 1897 1898 QualType getResultType() const { return ResultType; } 1899 1900 unsigned getRegParmType() const { return RegParm; } 1901 bool getNoReturnAttr() const { return NoReturn; } 1902 CallingConv getCallConv() const { return (CallingConv)CallConv; } 1903 ExtInfo getExtInfo() const { 1904 return ExtInfo(NoReturn, RegParm, (CallingConv)CallConv); 1905 } 1906 1907 /// \brief Determine the type of an expression that calls a function of 1908 /// this type. 1909 QualType getCallResultType(ASTContext &Context) const { 1910 return getResultType().getCallResultType(Context); 1911 } 1912 1913 static llvm::StringRef getNameForCallConv(CallingConv CC); 1914 1915 static bool classof(const Type *T) { 1916 return T->getTypeClass() == FunctionNoProto || 1917 T->getTypeClass() == FunctionProto; 1918 } 1919 static bool classof(const FunctionType *) { return true; } 1920}; 1921 1922/// FunctionNoProtoType - Represents a K&R-style 'int foo()' function, which has 1923/// no information available about its arguments. 1924class FunctionNoProtoType : public FunctionType, public llvm::FoldingSetNode { 1925 FunctionNoProtoType(QualType Result, QualType Canonical, 1926 const ExtInfo &Info) 1927 : FunctionType(FunctionNoProto, Result, false, 0, Canonical, 1928 /*Dependent=*/false, Info) {} 1929 friend class ASTContext; // ASTContext creates these. 1930 1931protected: 1932 virtual Linkage getLinkageImpl() const; 1933 1934public: 1935 // No additional state past what FunctionType provides. 1936 1937 bool isSugared() const { return false; } 1938 QualType desugar() const { return QualType(this, 0); } 1939 1940 void Profile(llvm::FoldingSetNodeID &ID) { 1941 Profile(ID, getResultType(), getExtInfo()); 1942 } 1943 static void Profile(llvm::FoldingSetNodeID &ID, QualType ResultType, 1944 const ExtInfo &Info) { 1945 ID.AddInteger(Info.getCC()); 1946 ID.AddInteger(Info.getRegParm()); 1947 ID.AddInteger(Info.getNoReturn()); 1948 ID.AddPointer(ResultType.getAsOpaquePtr()); 1949 } 1950 1951 static bool classof(const Type *T) { 1952 return T->getTypeClass() == FunctionNoProto; 1953 } 1954 static bool classof(const FunctionNoProtoType *) { return true; } 1955}; 1956 1957/// FunctionProtoType - Represents a prototype with argument type info, e.g. 1958/// 'int foo(int)' or 'int foo(void)'. 'void' is represented as having no 1959/// arguments, not as having a single void argument. Such a type can have an 1960/// exception specification, but this specification is not part of the canonical 1961/// type. 1962class FunctionProtoType : public FunctionType, public llvm::FoldingSetNode { 1963 /// hasAnyDependentType - Determine whether there are any dependent 1964 /// types within the arguments passed in. 1965 static bool hasAnyDependentType(const QualType *ArgArray, unsigned numArgs) { 1966 for (unsigned Idx = 0; Idx < numArgs; ++Idx) 1967 if (ArgArray[Idx]->isDependentType()) 1968 return true; 1969 1970 return false; 1971 } 1972 1973 FunctionProtoType(QualType Result, const QualType *ArgArray, unsigned numArgs, 1974 bool isVariadic, unsigned typeQuals, bool hasExs, 1975 bool hasAnyExs, const QualType *ExArray, 1976 unsigned numExs, QualType Canonical, 1977 const ExtInfo &Info) 1978 : FunctionType(FunctionProto, Result, isVariadic, typeQuals, Canonical, 1979 (Result->isDependentType() || 1980 hasAnyDependentType(ArgArray, numArgs)), 1981 Info), 1982 NumArgs(numArgs), NumExceptions(numExs), HasExceptionSpec(hasExs), 1983 AnyExceptionSpec(hasAnyExs) { 1984 // Fill in the trailing argument array. 1985 QualType *ArgInfo = reinterpret_cast<QualType*>(this+1); 1986 for (unsigned i = 0; i != numArgs; ++i) 1987 ArgInfo[i] = ArgArray[i]; 1988 // Fill in the exception array. 1989 QualType *Ex = ArgInfo + numArgs; 1990 for (unsigned i = 0; i != numExs; ++i) 1991 Ex[i] = ExArray[i]; 1992 } 1993 1994 /// NumArgs - The number of arguments this function has, not counting '...'. 1995 unsigned NumArgs : 20; 1996 1997 /// NumExceptions - The number of types in the exception spec, if any. 1998 unsigned NumExceptions : 10; 1999 2000 /// HasExceptionSpec - Whether this function has an exception spec at all. 2001 bool HasExceptionSpec : 1; 2002 2003 /// AnyExceptionSpec - Whether this function has a throw(...) spec. 2004 bool AnyExceptionSpec : 1; 2005 2006 /// ArgInfo - There is an variable size array after the class in memory that 2007 /// holds the argument types. 2008 2009 /// Exceptions - There is another variable size array after ArgInfo that 2010 /// holds the exception types. 2011 2012 friend class ASTContext; // ASTContext creates these. 2013 2014protected: 2015 virtual Linkage getLinkageImpl() const; 2016 2017public: 2018 unsigned getNumArgs() const { return NumArgs; } 2019 QualType getArgType(unsigned i) const { 2020 assert(i < NumArgs && "Invalid argument number!"); 2021 return arg_type_begin()[i]; 2022 } 2023 2024 bool hasExceptionSpec() const { return HasExceptionSpec; } 2025 bool hasAnyExceptionSpec() const { return AnyExceptionSpec; } 2026 unsigned getNumExceptions() const { return NumExceptions; } 2027 QualType getExceptionType(unsigned i) const { 2028 assert(i < NumExceptions && "Invalid exception number!"); 2029 return exception_begin()[i]; 2030 } 2031 bool hasEmptyExceptionSpec() const { 2032 return hasExceptionSpec() && !hasAnyExceptionSpec() && 2033 getNumExceptions() == 0; 2034 } 2035 2036 bool isVariadic() const { return getSubClassData(); } 2037 unsigned getTypeQuals() const { return FunctionType::getTypeQuals(); } 2038 2039 typedef const QualType *arg_type_iterator; 2040 arg_type_iterator arg_type_begin() const { 2041 return reinterpret_cast<const QualType *>(this+1); 2042 } 2043 arg_type_iterator arg_type_end() const { return arg_type_begin()+NumArgs; } 2044 2045 typedef const QualType *exception_iterator; 2046 exception_iterator exception_begin() const { 2047 // exceptions begin where arguments end 2048 return arg_type_end(); 2049 } 2050 exception_iterator exception_end() const { 2051 return exception_begin() + NumExceptions; 2052 } 2053 2054 bool isSugared() const { return false; } 2055 QualType desugar() const { return QualType(this, 0); } 2056 2057 static bool classof(const Type *T) { 2058 return T->getTypeClass() == FunctionProto; 2059 } 2060 static bool classof(const FunctionProtoType *) { return true; } 2061 2062 void Profile(llvm::FoldingSetNodeID &ID); 2063 static void Profile(llvm::FoldingSetNodeID &ID, QualType Result, 2064 arg_type_iterator ArgTys, unsigned NumArgs, 2065 bool isVariadic, unsigned TypeQuals, 2066 bool hasExceptionSpec, bool anyExceptionSpec, 2067 unsigned NumExceptions, exception_iterator Exs, 2068 const ExtInfo &ExtInfo); 2069}; 2070 2071 2072/// \brief Represents the dependent type named by a dependently-scoped 2073/// typename using declaration, e.g. 2074/// using typename Base<T>::foo; 2075/// Template instantiation turns these into the underlying type. 2076class UnresolvedUsingType : public Type { 2077 UnresolvedUsingTypenameDecl *Decl; 2078 2079 UnresolvedUsingType(const UnresolvedUsingTypenameDecl *D) 2080 : Type(UnresolvedUsing, QualType(), true), 2081 Decl(const_cast<UnresolvedUsingTypenameDecl*>(D)) {} 2082 friend class ASTContext; // ASTContext creates these. 2083public: 2084 2085 UnresolvedUsingTypenameDecl *getDecl() const { return Decl; } 2086 2087 bool isSugared() const { return false; } 2088 QualType desugar() const { return QualType(this, 0); } 2089 2090 static bool classof(const Type *T) { 2091 return T->getTypeClass() == UnresolvedUsing; 2092 } 2093 static bool classof(const UnresolvedUsingType *) { return true; } 2094 2095 void Profile(llvm::FoldingSetNodeID &ID) { 2096 return Profile(ID, Decl); 2097 } 2098 static void Profile(llvm::FoldingSetNodeID &ID, 2099 UnresolvedUsingTypenameDecl *D) { 2100 ID.AddPointer(D); 2101 } 2102}; 2103 2104 2105class TypedefType : public Type { 2106 TypedefDecl *Decl; 2107protected: 2108 TypedefType(TypeClass tc, const TypedefDecl *D, QualType can) 2109 : Type(tc, can, can->isDependentType()), 2110 Decl(const_cast<TypedefDecl*>(D)) { 2111 assert(!isa<TypedefType>(can) && "Invalid canonical type"); 2112 } 2113 friend class ASTContext; // ASTContext creates these. 2114public: 2115 2116 TypedefDecl *getDecl() const { return Decl; } 2117 2118 /// LookThroughTypedefs - Return the ultimate type this typedef corresponds to 2119 /// potentially looking through *all* consecutive typedefs. This returns the 2120 /// sum of the type qualifiers, so if you have: 2121 /// typedef const int A; 2122 /// typedef volatile A B; 2123 /// looking through the typedefs for B will give you "const volatile A". 2124 QualType LookThroughTypedefs() const; 2125 2126 bool isSugared() const { return true; } 2127 QualType desugar() const; 2128 2129 static bool classof(const Type *T) { return T->getTypeClass() == Typedef; } 2130 static bool classof(const TypedefType *) { return true; } 2131}; 2132 2133/// TypeOfExprType (GCC extension). 2134class TypeOfExprType : public Type { 2135 Expr *TOExpr; 2136 2137protected: 2138 TypeOfExprType(Expr *E, QualType can = QualType()); 2139 friend class ASTContext; // ASTContext creates these. 2140public: 2141 Expr *getUnderlyingExpr() const { return TOExpr; } 2142 2143 /// \brief Remove a single level of sugar. 2144 QualType desugar() const; 2145 2146 /// \brief Returns whether this type directly provides sugar. 2147 bool isSugared() const { return true; } 2148 2149 static bool classof(const Type *T) { return T->getTypeClass() == TypeOfExpr; } 2150 static bool classof(const TypeOfExprType *) { return true; } 2151}; 2152 2153/// \brief Internal representation of canonical, dependent 2154/// typeof(expr) types. 2155/// 2156/// This class is used internally by the ASTContext to manage 2157/// canonical, dependent types, only. Clients will only see instances 2158/// of this class via TypeOfExprType nodes. 2159class DependentTypeOfExprType 2160 : public TypeOfExprType, public llvm::FoldingSetNode { 2161 ASTContext &Context; 2162 2163public: 2164 DependentTypeOfExprType(ASTContext &Context, Expr *E) 2165 : TypeOfExprType(E), Context(Context) { } 2166 2167 bool isSugared() const { return false; } 2168 QualType desugar() const { return QualType(this, 0); } 2169 2170 void Profile(llvm::FoldingSetNodeID &ID) { 2171 Profile(ID, Context, getUnderlyingExpr()); 2172 } 2173 2174 static void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context, 2175 Expr *E); 2176}; 2177 2178/// TypeOfType (GCC extension). 2179class TypeOfType : public Type { 2180 QualType TOType; 2181 TypeOfType(QualType T, QualType can) 2182 : Type(TypeOf, can, T->isDependentType()), TOType(T) { 2183 assert(!isa<TypedefType>(can) && "Invalid canonical type"); 2184 } 2185 friend class ASTContext; // ASTContext creates these. 2186public: 2187 QualType getUnderlyingType() const { return TOType; } 2188 2189 /// \brief Remove a single level of sugar. 2190 QualType desugar() const { return getUnderlyingType(); } 2191 2192 /// \brief Returns whether this type directly provides sugar. 2193 bool isSugared() const { return true; } 2194 2195 static bool classof(const Type *T) { return T->getTypeClass() == TypeOf; } 2196 static bool classof(const TypeOfType *) { return true; } 2197}; 2198 2199/// DecltypeType (C++0x) 2200class DecltypeType : public Type { 2201 Expr *E; 2202 2203 // FIXME: We could get rid of UnderlyingType if we wanted to: We would have to 2204 // Move getDesugaredType to ASTContext so that it can call getDecltypeForExpr 2205 // from it. 2206 QualType UnderlyingType; 2207 2208protected: 2209 DecltypeType(Expr *E, QualType underlyingType, QualType can = QualType()); 2210 friend class ASTContext; // ASTContext creates these. 2211public: 2212 Expr *getUnderlyingExpr() const { return E; } 2213 QualType getUnderlyingType() const { return UnderlyingType; } 2214 2215 /// \brief Remove a single level of sugar. 2216 QualType desugar() const { return getUnderlyingType(); } 2217 2218 /// \brief Returns whether this type directly provides sugar. 2219 bool isSugared() const { return !isDependentType(); } 2220 2221 static bool classof(const Type *T) { return T->getTypeClass() == Decltype; } 2222 static bool classof(const DecltypeType *) { return true; } 2223}; 2224 2225/// \brief Internal representation of canonical, dependent 2226/// decltype(expr) types. 2227/// 2228/// This class is used internally by the ASTContext to manage 2229/// canonical, dependent types, only. Clients will only see instances 2230/// of this class via DecltypeType nodes. 2231class DependentDecltypeType : public DecltypeType, public llvm::FoldingSetNode { 2232 ASTContext &Context; 2233 2234public: 2235 DependentDecltypeType(ASTContext &Context, Expr *E); 2236 2237 bool isSugared() const { return false; } 2238 QualType desugar() const { return QualType(this, 0); } 2239 2240 void Profile(llvm::FoldingSetNodeID &ID) { 2241 Profile(ID, Context, getUnderlyingExpr()); 2242 } 2243 2244 static void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context, 2245 Expr *E); 2246}; 2247 2248class TagType : public Type { 2249 /// Stores the TagDecl associated with this type. The decl will 2250 /// point to the TagDecl that actually defines the entity (or is a 2251 /// definition in progress), if there is such a definition. The 2252 /// single-bit value will be non-zero when this tag is in the 2253 /// process of being defined. 2254 mutable llvm::PointerIntPair<TagDecl *, 1> decl; 2255 friend class ASTContext; 2256 friend class TagDecl; 2257 2258protected: 2259 TagType(TypeClass TC, const TagDecl *D, QualType can); 2260 2261 virtual Linkage getLinkageImpl() const; 2262 2263public: 2264 TagDecl *getDecl() const { return decl.getPointer(); } 2265 2266 /// @brief Determines whether this type is in the process of being 2267 /// defined. 2268 bool isBeingDefined() const { return decl.getInt(); } 2269 void setBeingDefined(bool Def) const { decl.setInt(Def? 1 : 0); } 2270 2271 static bool classof(const Type *T) { 2272 return T->getTypeClass() >= TagFirst && T->getTypeClass() <= TagLast; 2273 } 2274 static bool classof(const TagType *) { return true; } 2275 static bool classof(const RecordType *) { return true; } 2276 static bool classof(const EnumType *) { return true; } 2277}; 2278 2279/// RecordType - This is a helper class that allows the use of isa/cast/dyncast 2280/// to detect TagType objects of structs/unions/classes. 2281class RecordType : public TagType { 2282protected: 2283 explicit RecordType(const RecordDecl *D) 2284 : TagType(Record, reinterpret_cast<const TagDecl*>(D), QualType()) { } 2285 explicit RecordType(TypeClass TC, RecordDecl *D) 2286 : TagType(TC, reinterpret_cast<const TagDecl*>(D), QualType()) { } 2287 friend class ASTContext; // ASTContext creates these. 2288public: 2289 2290 RecordDecl *getDecl() const { 2291 return reinterpret_cast<RecordDecl*>(TagType::getDecl()); 2292 } 2293 2294 // FIXME: This predicate is a helper to QualType/Type. It needs to 2295 // recursively check all fields for const-ness. If any field is declared 2296 // const, it needs to return false. 2297 bool hasConstFields() const { return false; } 2298 2299 // FIXME: RecordType needs to check when it is created that all fields are in 2300 // the same address space, and return that. 2301 unsigned getAddressSpace() const { return 0; } 2302 2303 bool isSugared() const { return false; } 2304 QualType desugar() const { return QualType(this, 0); } 2305 2306 static bool classof(const TagType *T); 2307 static bool classof(const Type *T) { 2308 return isa<TagType>(T) && classof(cast<TagType>(T)); 2309 } 2310 static bool classof(const RecordType *) { return true; } 2311}; 2312 2313/// EnumType - This is a helper class that allows the use of isa/cast/dyncast 2314/// to detect TagType objects of enums. 2315class EnumType : public TagType { 2316 explicit EnumType(const EnumDecl *D) 2317 : TagType(Enum, reinterpret_cast<const TagDecl*>(D), QualType()) { } 2318 friend class ASTContext; // ASTContext creates these. 2319public: 2320 2321 EnumDecl *getDecl() const { 2322 return reinterpret_cast<EnumDecl*>(TagType::getDecl()); 2323 } 2324 2325 bool isSugared() const { return false; } 2326 QualType desugar() const { return QualType(this, 0); } 2327 2328 static bool classof(const TagType *T); 2329 static bool classof(const Type *T) { 2330 return isa<TagType>(T) && classof(cast<TagType>(T)); 2331 } 2332 static bool classof(const EnumType *) { return true; } 2333}; 2334 2335class TemplateTypeParmType : public Type, public llvm::FoldingSetNode { 2336 unsigned Depth : 15; 2337 unsigned Index : 16; 2338 unsigned ParameterPack : 1; 2339 IdentifierInfo *Name; 2340 2341 TemplateTypeParmType(unsigned D, unsigned I, bool PP, IdentifierInfo *N, 2342 QualType Canon) 2343 : Type(TemplateTypeParm, Canon, /*Dependent=*/true), 2344 Depth(D), Index(I), ParameterPack(PP), Name(N) { } 2345 2346 TemplateTypeParmType(unsigned D, unsigned I, bool PP) 2347 : Type(TemplateTypeParm, QualType(this, 0), /*Dependent=*/true), 2348 Depth(D), Index(I), ParameterPack(PP), Name(0) { } 2349 2350 friend class ASTContext; // ASTContext creates these 2351 2352public: 2353 unsigned getDepth() const { return Depth; } 2354 unsigned getIndex() const { return Index; } 2355 bool isParameterPack() const { return ParameterPack; } 2356 IdentifierInfo *getName() const { return Name; } 2357 2358 bool isSugared() const { return false; } 2359 QualType desugar() const { return QualType(this, 0); } 2360 2361 void Profile(llvm::FoldingSetNodeID &ID) { 2362 Profile(ID, Depth, Index, ParameterPack, Name); 2363 } 2364 2365 static void Profile(llvm::FoldingSetNodeID &ID, unsigned Depth, 2366 unsigned Index, bool ParameterPack, 2367 IdentifierInfo *Name) { 2368 ID.AddInteger(Depth); 2369 ID.AddInteger(Index); 2370 ID.AddBoolean(ParameterPack); 2371 ID.AddPointer(Name); 2372 } 2373 2374 static bool classof(const Type *T) { 2375 return T->getTypeClass() == TemplateTypeParm; 2376 } 2377 static bool classof(const TemplateTypeParmType *T) { return true; } 2378}; 2379 2380/// \brief Represents the result of substituting a type for a template 2381/// type parameter. 2382/// 2383/// Within an instantiated template, all template type parameters have 2384/// been replaced with these. They are used solely to record that a 2385/// type was originally written as a template type parameter; 2386/// therefore they are never canonical. 2387class SubstTemplateTypeParmType : public Type, public llvm::FoldingSetNode { 2388 // The original type parameter. 2389 const TemplateTypeParmType *Replaced; 2390 2391 SubstTemplateTypeParmType(const TemplateTypeParmType *Param, QualType Canon) 2392 : Type(SubstTemplateTypeParm, Canon, Canon->isDependentType()), 2393 Replaced(Param) { } 2394 2395 friend class ASTContext; 2396 2397public: 2398 IdentifierInfo *getName() const { return Replaced->getName(); } 2399 2400 /// Gets the template parameter that was substituted for. 2401 const TemplateTypeParmType *getReplacedParameter() const { 2402 return Replaced; 2403 } 2404 2405 /// Gets the type that was substituted for the template 2406 /// parameter. 2407 QualType getReplacementType() const { 2408 return getCanonicalTypeInternal(); 2409 } 2410 2411 bool isSugared() const { return true; } 2412 QualType desugar() const { return getReplacementType(); } 2413 2414 void Profile(llvm::FoldingSetNodeID &ID) { 2415 Profile(ID, getReplacedParameter(), getReplacementType()); 2416 } 2417 static void Profile(llvm::FoldingSetNodeID &ID, 2418 const TemplateTypeParmType *Replaced, 2419 QualType Replacement) { 2420 ID.AddPointer(Replaced); 2421 ID.AddPointer(Replacement.getAsOpaquePtr()); 2422 } 2423 2424 static bool classof(const Type *T) { 2425 return T->getTypeClass() == SubstTemplateTypeParm; 2426 } 2427 static bool classof(const SubstTemplateTypeParmType *T) { return true; } 2428}; 2429 2430/// \brief Represents the type of a template specialization as written 2431/// in the source code. 2432/// 2433/// Template specialization types represent the syntactic form of a 2434/// template-id that refers to a type, e.g., @c vector<int>. Some 2435/// template specialization types are syntactic sugar, whose canonical 2436/// type will point to some other type node that represents the 2437/// instantiation or class template specialization. For example, a 2438/// class template specialization type of @c vector<int> will refer to 2439/// a tag type for the instantiation 2440/// @c std::vector<int, std::allocator<int>>. 2441/// 2442/// Other template specialization types, for which the template name 2443/// is dependent, may be canonical types. These types are always 2444/// dependent. 2445class TemplateSpecializationType 2446 : public Type, public llvm::FoldingSetNode { 2447 /// \brief The name of the template being specialized. 2448 TemplateName Template; 2449 2450 /// \brief - The number of template arguments named in this class 2451 /// template specialization. 2452 unsigned NumArgs; 2453 2454 TemplateSpecializationType(TemplateName T, 2455 const TemplateArgument *Args, 2456 unsigned NumArgs, QualType Canon); 2457 2458 virtual void Destroy(ASTContext& C); 2459 2460 friend class ASTContext; // ASTContext creates these 2461 2462public: 2463 /// \brief Determine whether any of the given template arguments are 2464 /// dependent. 2465 static bool anyDependentTemplateArguments(const TemplateArgument *Args, 2466 unsigned NumArgs); 2467 2468 static bool anyDependentTemplateArguments(const TemplateArgumentLoc *Args, 2469 unsigned NumArgs); 2470 2471 static bool anyDependentTemplateArguments(const TemplateArgumentListInfo &); 2472 2473 /// \brief Print a template argument list, including the '<' and '>' 2474 /// enclosing the template arguments. 2475 static std::string PrintTemplateArgumentList(const TemplateArgument *Args, 2476 unsigned NumArgs, 2477 const PrintingPolicy &Policy); 2478 2479 static std::string PrintTemplateArgumentList(const TemplateArgumentLoc *Args, 2480 unsigned NumArgs, 2481 const PrintingPolicy &Policy); 2482 2483 static std::string PrintTemplateArgumentList(const TemplateArgumentListInfo &, 2484 const PrintingPolicy &Policy); 2485 2486 /// True if this template specialization type matches a current 2487 /// instantiation in the context in which it is found. 2488 bool isCurrentInstantiation() const { 2489 return isa<InjectedClassNameType>(getCanonicalTypeInternal()); 2490 } 2491 2492 typedef const TemplateArgument * iterator; 2493 2494 iterator begin() const { return getArgs(); } 2495 iterator end() const; // defined inline in TemplateBase.h 2496 2497 /// \brief Retrieve the name of the template that we are specializing. 2498 TemplateName getTemplateName() const { return Template; } 2499 2500 /// \brief Retrieve the template arguments. 2501 const TemplateArgument *getArgs() const { 2502 return reinterpret_cast<const TemplateArgument *>(this + 1); 2503 } 2504 2505 /// \brief Retrieve the number of template arguments. 2506 unsigned getNumArgs() const { return NumArgs; } 2507 2508 /// \brief Retrieve a specific template argument as a type. 2509 /// \precondition @c isArgType(Arg) 2510 const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h 2511 2512 bool isSugared() const { 2513 return !isDependentType() || isCurrentInstantiation(); 2514 } 2515 QualType desugar() const { return getCanonicalTypeInternal(); } 2516 2517 void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Ctx) { 2518 Profile(ID, Template, getArgs(), NumArgs, Ctx); 2519 } 2520 2521 static void Profile(llvm::FoldingSetNodeID &ID, TemplateName T, 2522 const TemplateArgument *Args, 2523 unsigned NumArgs, 2524 ASTContext &Context); 2525 2526 static bool classof(const Type *T) { 2527 return T->getTypeClass() == TemplateSpecialization; 2528 } 2529 static bool classof(const TemplateSpecializationType *T) { return true; } 2530}; 2531 2532/// \brief The injected class name of a C++ class template or class 2533/// template partial specialization. Used to record that a type was 2534/// spelled with a bare identifier rather than as a template-id; the 2535/// equivalent for non-templated classes is just RecordType. 2536/// 2537/// Injected class name types are always dependent. Template 2538/// instantiation turns these into RecordTypes. 2539/// 2540/// Injected class name types are always canonical. This works 2541/// because it is impossible to compare an injected class name type 2542/// with the corresponding non-injected template type, for the same 2543/// reason that it is impossible to directly compare template 2544/// parameters from different dependent contexts: injected class name 2545/// types can only occur within the scope of a particular templated 2546/// declaration, and within that scope every template specialization 2547/// will canonicalize to the injected class name (when appropriate 2548/// according to the rules of the language). 2549class InjectedClassNameType : public Type { 2550 CXXRecordDecl *Decl; 2551 2552 /// The template specialization which this type represents. 2553 /// For example, in 2554 /// template <class T> class A { ... }; 2555 /// this is A<T>, whereas in 2556 /// template <class X, class Y> class A<B<X,Y> > { ... }; 2557 /// this is A<B<X,Y> >. 2558 /// 2559 /// It is always unqualified, always a template specialization type, 2560 /// and always dependent. 2561 QualType InjectedType; 2562 2563 friend class ASTContext; // ASTContext creates these. 2564 friend class TagDecl; // TagDecl mutilates the Decl 2565 friend class PCHReader; // FIXME: ASTContext::getInjectedClassNameType is not 2566 // currently suitable for PCH reading, too much 2567 // interdependencies. 2568 InjectedClassNameType(CXXRecordDecl *D, QualType TST) 2569 : Type(InjectedClassName, QualType(), true), 2570 Decl(D), InjectedType(TST) { 2571 assert(isa<TemplateSpecializationType>(TST)); 2572 assert(!TST.hasQualifiers()); 2573 assert(TST->isDependentType()); 2574 } 2575 2576public: 2577 QualType getInjectedSpecializationType() const { return InjectedType; } 2578 const TemplateSpecializationType *getInjectedTST() const { 2579 return cast<TemplateSpecializationType>(InjectedType.getTypePtr()); 2580 } 2581 2582 CXXRecordDecl *getDecl() const { return Decl; } 2583 2584 bool isSugared() const { return false; } 2585 QualType desugar() const { return QualType(this, 0); } 2586 2587 static bool classof(const Type *T) { 2588 return T->getTypeClass() == InjectedClassName; 2589 } 2590 static bool classof(const InjectedClassNameType *T) { return true; } 2591}; 2592 2593/// \brief The kind of a tag type. 2594enum TagTypeKind { 2595 /// \brief The "struct" keyword. 2596 TTK_Struct, 2597 /// \brief The "union" keyword. 2598 TTK_Union, 2599 /// \brief The "class" keyword. 2600 TTK_Class, 2601 /// \brief The "enum" keyword. 2602 TTK_Enum 2603}; 2604 2605/// \brief The elaboration keyword that precedes a qualified type name or 2606/// introduces an elaborated-type-specifier. 2607enum ElaboratedTypeKeyword { 2608 /// \brief The "struct" keyword introduces the elaborated-type-specifier. 2609 ETK_Struct, 2610 /// \brief The "union" keyword introduces the elaborated-type-specifier. 2611 ETK_Union, 2612 /// \brief The "class" keyword introduces the elaborated-type-specifier. 2613 ETK_Class, 2614 /// \brief The "enum" keyword introduces the elaborated-type-specifier. 2615 ETK_Enum, 2616 /// \brief The "typename" keyword precedes the qualified type name, e.g., 2617 /// \c typename T::type. 2618 ETK_Typename, 2619 /// \brief No keyword precedes the qualified type name. 2620 ETK_None 2621}; 2622 2623/// A helper class for Type nodes having an ElaboratedTypeKeyword. 2624/// The keyword in stored in the free bits of the base class. 2625/// Also provides a few static helpers for converting and printing 2626/// elaborated type keyword and tag type kind enumerations. 2627class TypeWithKeyword : public Type { 2628 /// Keyword - Encodes an ElaboratedTypeKeyword enumeration constant. 2629 unsigned Keyword : 3; 2630 2631protected: 2632 TypeWithKeyword(ElaboratedTypeKeyword Keyword, TypeClass tc, 2633 QualType Canonical, bool dependent) 2634 : Type(tc, Canonical, dependent), Keyword(Keyword) {} 2635 2636public: 2637 virtual ~TypeWithKeyword(); // pin vtable to Type.cpp 2638 2639 ElaboratedTypeKeyword getKeyword() const { 2640 return static_cast<ElaboratedTypeKeyword>(Keyword); 2641 } 2642 2643 /// getKeywordForTypeSpec - Converts a type specifier (DeclSpec::TST) 2644 /// into an elaborated type keyword. 2645 static ElaboratedTypeKeyword getKeywordForTypeSpec(unsigned TypeSpec); 2646 2647 /// getTagTypeKindForTypeSpec - Converts a type specifier (DeclSpec::TST) 2648 /// into a tag type kind. It is an error to provide a type specifier 2649 /// which *isn't* a tag kind here. 2650 static TagTypeKind getTagTypeKindForTypeSpec(unsigned TypeSpec); 2651 2652 /// getKeywordForTagDeclKind - Converts a TagTypeKind into an 2653 /// elaborated type keyword. 2654 static ElaboratedTypeKeyword getKeywordForTagTypeKind(TagTypeKind Tag); 2655 2656 /// getTagTypeKindForKeyword - Converts an elaborated type keyword into 2657 // a TagTypeKind. It is an error to provide an elaborated type keyword 2658 /// which *isn't* a tag kind here. 2659 static TagTypeKind getTagTypeKindForKeyword(ElaboratedTypeKeyword Keyword); 2660 2661 static bool KeywordIsTagTypeKind(ElaboratedTypeKeyword Keyword); 2662 2663 static const char *getKeywordName(ElaboratedTypeKeyword Keyword); 2664 2665 static const char *getTagTypeKindName(TagTypeKind Kind) { 2666 return getKeywordName(getKeywordForTagTypeKind(Kind)); 2667 } 2668 2669 class CannotCastToThisType {}; 2670 static CannotCastToThisType classof(const Type *); 2671}; 2672 2673/// \brief Represents a type that was referred to using an elaborated type 2674/// keyword, e.g., struct S, or via a qualified name, e.g., N::M::type, 2675/// or both. 2676/// 2677/// This type is used to keep track of a type name as written in the 2678/// source code, including tag keywords and any nested-name-specifiers. 2679/// The type itself is always "sugar", used to express what was written 2680/// in the source code but containing no additional semantic information. 2681class ElaboratedType : public TypeWithKeyword, public llvm::FoldingSetNode { 2682 2683 /// \brief The nested name specifier containing the qualifier. 2684 NestedNameSpecifier *NNS; 2685 2686 /// \brief The type that this qualified name refers to. 2687 QualType NamedType; 2688 2689 ElaboratedType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS, 2690 QualType NamedType, QualType CanonType) 2691 : TypeWithKeyword(Keyword, Elaborated, CanonType, 2692 NamedType->isDependentType()), 2693 NNS(NNS), NamedType(NamedType) { 2694 assert(!(Keyword == ETK_None && NNS == 0) && 2695 "ElaboratedType cannot have elaborated type keyword " 2696 "and name qualifier both null."); 2697 } 2698 2699 friend class ASTContext; // ASTContext creates these 2700 2701public: 2702 ~ElaboratedType(); 2703 2704 /// \brief Retrieve the qualification on this type. 2705 NestedNameSpecifier *getQualifier() const { return NNS; } 2706 2707 /// \brief Retrieve the type named by the qualified-id. 2708 QualType getNamedType() const { return NamedType; } 2709 2710 /// \brief Remove a single level of sugar. 2711 QualType desugar() const { return getNamedType(); } 2712 2713 /// \brief Returns whether this type directly provides sugar. 2714 bool isSugared() const { return true; } 2715 2716 void Profile(llvm::FoldingSetNodeID &ID) { 2717 Profile(ID, getKeyword(), NNS, NamedType); 2718 } 2719 2720 static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword, 2721 NestedNameSpecifier *NNS, QualType NamedType) { 2722 ID.AddInteger(Keyword); 2723 ID.AddPointer(NNS); 2724 NamedType.Profile(ID); 2725 } 2726 2727 static bool classof(const Type *T) { 2728 return T->getTypeClass() == Elaborated; 2729 } 2730 static bool classof(const ElaboratedType *T) { return true; } 2731}; 2732 2733/// \brief Represents a qualified type name for which the type name is 2734/// dependent. 2735/// 2736/// DependentNameType represents a class of dependent types that involve a 2737/// dependent nested-name-specifier (e.g., "T::") followed by a (dependent) 2738/// name of a type. The DependentNameType may start with a "typename" (for a 2739/// typename-specifier), "class", "struct", "union", or "enum" (for a 2740/// dependent elaborated-type-specifier), or nothing (in contexts where we 2741/// know that we must be referring to a type, e.g., in a base class specifier). 2742class DependentNameType : public TypeWithKeyword, public llvm::FoldingSetNode { 2743 2744 /// \brief The nested name specifier containing the qualifier. 2745 NestedNameSpecifier *NNS; 2746 2747 /// \brief The type that this typename specifier refers to. 2748 const IdentifierInfo *Name; 2749 2750 DependentNameType(ElaboratedTypeKeyword Keyword, NestedNameSpecifier *NNS, 2751 const IdentifierInfo *Name, QualType CanonType) 2752 : TypeWithKeyword(Keyword, DependentName, CanonType, true), 2753 NNS(NNS), Name(Name) { 2754 assert(NNS->isDependent() && 2755 "DependentNameType requires a dependent nested-name-specifier"); 2756 } 2757 2758 friend class ASTContext; // ASTContext creates these 2759 2760public: 2761 virtual ~DependentNameType(); 2762 2763 /// \brief Retrieve the qualification on this type. 2764 NestedNameSpecifier *getQualifier() const { return NNS; } 2765 2766 /// \brief Retrieve the type named by the typename specifier as an 2767 /// identifier. 2768 /// 2769 /// This routine will return a non-NULL identifier pointer when the 2770 /// form of the original typename was terminated by an identifier, 2771 /// e.g., "typename T::type". 2772 const IdentifierInfo *getIdentifier() const { 2773 return Name; 2774 } 2775 2776 bool isSugared() const { return false; } 2777 QualType desugar() const { return QualType(this, 0); } 2778 2779 void Profile(llvm::FoldingSetNodeID &ID) { 2780 Profile(ID, getKeyword(), NNS, Name); 2781 } 2782 2783 static void Profile(llvm::FoldingSetNodeID &ID, ElaboratedTypeKeyword Keyword, 2784 NestedNameSpecifier *NNS, const IdentifierInfo *Name) { 2785 ID.AddInteger(Keyword); 2786 ID.AddPointer(NNS); 2787 ID.AddPointer(Name); 2788 } 2789 2790 static bool classof(const Type *T) { 2791 return T->getTypeClass() == DependentName; 2792 } 2793 static bool classof(const DependentNameType *T) { return true; } 2794}; 2795 2796/// DependentTemplateSpecializationType - Represents a template 2797/// specialization type whose template cannot be resolved, e.g. 2798/// A<T>::template B<T> 2799class DependentTemplateSpecializationType : 2800 public TypeWithKeyword, public llvm::FoldingSetNode { 2801 2802 /// \brief The nested name specifier containing the qualifier. 2803 NestedNameSpecifier *NNS; 2804 2805 /// \brief The identifier of the template. 2806 const IdentifierInfo *Name; 2807 2808 /// \brief - The number of template arguments named in this class 2809 /// template specialization. 2810 unsigned NumArgs; 2811 2812 const TemplateArgument *getArgBuffer() const { 2813 return reinterpret_cast<const TemplateArgument*>(this+1); 2814 } 2815 TemplateArgument *getArgBuffer() { 2816 return reinterpret_cast<TemplateArgument*>(this+1); 2817 } 2818 2819 DependentTemplateSpecializationType(ElaboratedTypeKeyword Keyword, 2820 NestedNameSpecifier *NNS, 2821 const IdentifierInfo *Name, 2822 unsigned NumArgs, 2823 const TemplateArgument *Args, 2824 QualType Canon); 2825 2826 virtual void Destroy(ASTContext& C); 2827 2828 friend class ASTContext; // ASTContext creates these 2829 2830public: 2831 virtual ~DependentTemplateSpecializationType(); 2832 2833 NestedNameSpecifier *getQualifier() const { return NNS; } 2834 const IdentifierInfo *getIdentifier() const { return Name; } 2835 2836 /// \brief Retrieve the template arguments. 2837 const TemplateArgument *getArgs() const { 2838 return getArgBuffer(); 2839 } 2840 2841 /// \brief Retrieve the number of template arguments. 2842 unsigned getNumArgs() const { return NumArgs; } 2843 2844 const TemplateArgument &getArg(unsigned Idx) const; // in TemplateBase.h 2845 2846 typedef const TemplateArgument * iterator; 2847 iterator begin() const { return getArgs(); } 2848 iterator end() const; // inline in TemplateBase.h 2849 2850 bool isSugared() const { return false; } 2851 QualType desugar() const { return QualType(this, 0); } 2852 2853 void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context) { 2854 Profile(ID, Context, getKeyword(), NNS, Name, NumArgs, getArgs()); 2855 } 2856 2857 static void Profile(llvm::FoldingSetNodeID &ID, 2858 ASTContext &Context, 2859 ElaboratedTypeKeyword Keyword, 2860 NestedNameSpecifier *Qualifier, 2861 const IdentifierInfo *Name, 2862 unsigned NumArgs, 2863 const TemplateArgument *Args); 2864 2865 static bool classof(const Type *T) { 2866 return T->getTypeClass() == DependentTemplateSpecialization; 2867 } 2868 static bool classof(const DependentTemplateSpecializationType *T) { 2869 return true; 2870 } 2871}; 2872 2873/// ObjCObjectType - Represents a class type in Objective C. 2874/// Every Objective C type is a combination of a base type and a 2875/// list of protocols. 2876/// 2877/// Given the following declarations: 2878/// @class C; 2879/// @protocol P; 2880/// 2881/// 'C' is an ObjCInterfaceType C. It is sugar for an ObjCObjectType 2882/// with base C and no protocols. 2883/// 2884/// 'C<P>' is an ObjCObjectType with base C and protocol list [P]. 2885/// 2886/// 'id' is a TypedefType which is sugar for an ObjCPointerType whose 2887/// pointee is an ObjCObjectType with base BuiltinType::ObjCIdType 2888/// and no protocols. 2889/// 2890/// 'id<P>' is an ObjCPointerType whose pointee is an ObjCObjecType 2891/// with base BuiltinType::ObjCIdType and protocol list [P]. Eventually 2892/// this should get its own sugar class to better represent the source. 2893class ObjCObjectType : public Type { 2894 // Pad the bit count up so that NumProtocols is 2-byte aligned 2895 unsigned : BitsRemainingInType - 16; 2896 2897 /// \brief The number of protocols stored after the 2898 /// ObjCObjectPointerType node. 2899 /// 2900 /// These protocols are those written directly on the type. If 2901 /// protocol qualifiers ever become additive, the iterators will 2902 /// get kindof complicated. 2903 /// 2904 /// In the canonical object type, these are sorted alphabetically 2905 /// and uniqued. 2906 unsigned NumProtocols : 16; 2907 2908 /// Either a BuiltinType or an InterfaceType or sugar for either. 2909 QualType BaseType; 2910 2911 ObjCProtocolDecl * const *getProtocolStorage() const { 2912 return const_cast<ObjCObjectType*>(this)->getProtocolStorage(); 2913 } 2914 2915 ObjCProtocolDecl **getProtocolStorage(); 2916 2917protected: 2918 ObjCObjectType(QualType Canonical, QualType Base, 2919 ObjCProtocolDecl * const *Protocols, unsigned NumProtocols); 2920 2921 enum Nonce_ObjCInterface { Nonce_ObjCInterface }; 2922 ObjCObjectType(enum Nonce_ObjCInterface) 2923 : Type(ObjCInterface, QualType(), false), 2924 NumProtocols(0), 2925 BaseType(QualType(this_(), 0)) {} 2926 2927protected: 2928 Linkage getLinkageImpl() const; // key function 2929 2930public: 2931 /// getBaseType - Gets the base type of this object type. This is 2932 /// always (possibly sugar for) one of: 2933 /// - the 'id' builtin type (as opposed to the 'id' type visible to the 2934 /// user, which is a typedef for an ObjCPointerType) 2935 /// - the 'Class' builtin type (same caveat) 2936 /// - an ObjCObjectType (currently always an ObjCInterfaceType) 2937 QualType getBaseType() const { return BaseType; } 2938 2939 bool isObjCId() const { 2940 return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCId); 2941 } 2942 bool isObjCClass() const { 2943 return getBaseType()->isSpecificBuiltinType(BuiltinType::ObjCClass); 2944 } 2945 bool isObjCUnqualifiedId() const { return qual_empty() && isObjCId(); } 2946 bool isObjCUnqualifiedClass() const { return qual_empty() && isObjCClass(); } 2947 bool isObjCUnqualifiedIdOrClass() const { 2948 if (!qual_empty()) return false; 2949 if (const BuiltinType *T = getBaseType()->getAs<BuiltinType>()) 2950 return T->getKind() == BuiltinType::ObjCId || 2951 T->getKind() == BuiltinType::ObjCClass; 2952 return false; 2953 } 2954 bool isObjCQualifiedId() const { return !qual_empty() && isObjCId(); } 2955 bool isObjCQualifiedClass() const { return !qual_empty() && isObjCClass(); } 2956 2957 /// Gets the interface declaration for this object type, if the base type 2958 /// really is an interface. 2959 ObjCInterfaceDecl *getInterface() const; 2960 2961 typedef ObjCProtocolDecl * const *qual_iterator; 2962 2963 qual_iterator qual_begin() const { return getProtocolStorage(); } 2964 qual_iterator qual_end() const { return qual_begin() + getNumProtocols(); } 2965 2966 bool qual_empty() const { return getNumProtocols() == 0; } 2967 2968 /// getNumProtocols - Return the number of qualifying protocols in this 2969 /// interface type, or 0 if there are none. 2970 unsigned getNumProtocols() const { return NumProtocols; } 2971 2972 /// \brief Fetch a protocol by index. 2973 ObjCProtocolDecl *getProtocol(unsigned I) const { 2974 assert(I < getNumProtocols() && "Out-of-range protocol access"); 2975 return qual_begin()[I]; 2976 } 2977 2978 bool isSugared() const { return false; } 2979 QualType desugar() const { return QualType(this, 0); } 2980 2981 static bool classof(const Type *T) { 2982 return T->getTypeClass() == ObjCObject || 2983 T->getTypeClass() == ObjCInterface; 2984 } 2985 static bool classof(const ObjCObjectType *) { return true; } 2986}; 2987 2988/// ObjCObjectTypeImpl - A class providing a concrete implementation 2989/// of ObjCObjectType, so as to not increase the footprint of 2990/// ObjCInterfaceType. Code outside of ASTContext and the core type 2991/// system should not reference this type. 2992class ObjCObjectTypeImpl : public ObjCObjectType, public llvm::FoldingSetNode { 2993 friend class ASTContext; 2994 2995 // If anyone adds fields here, ObjCObjectType::getProtocolStorage() 2996 // will need to be modified. 2997 2998 ObjCObjectTypeImpl(QualType Canonical, QualType Base, 2999 ObjCProtocolDecl * const *Protocols, 3000 unsigned NumProtocols) 3001 : ObjCObjectType(Canonical, Base, Protocols, NumProtocols) {} 3002 3003public: 3004 void Destroy(ASTContext& C); // key function 3005 3006 void Profile(llvm::FoldingSetNodeID &ID); 3007 static void Profile(llvm::FoldingSetNodeID &ID, 3008 QualType Base, 3009 ObjCProtocolDecl *const *protocols, 3010 unsigned NumProtocols); 3011}; 3012 3013inline ObjCProtocolDecl **ObjCObjectType::getProtocolStorage() { 3014 return reinterpret_cast<ObjCProtocolDecl**>( 3015 static_cast<ObjCObjectTypeImpl*>(this) + 1); 3016} 3017 3018/// ObjCInterfaceType - Interfaces are the core concept in Objective-C for 3019/// object oriented design. They basically correspond to C++ classes. There 3020/// are two kinds of interface types, normal interfaces like "NSString" and 3021/// qualified interfaces, which are qualified with a protocol list like 3022/// "NSString<NSCopyable, NSAmazing>". 3023/// 3024/// ObjCInterfaceType guarantees the following properties when considered 3025/// as a subtype of its superclass, ObjCObjectType: 3026/// - There are no protocol qualifiers. To reinforce this, code which 3027/// tries to invoke the protocol methods via an ObjCInterfaceType will 3028/// fail to compile. 3029/// - It is its own base type. That is, if T is an ObjCInterfaceType*, 3030/// T->getBaseType() == QualType(T, 0). 3031class ObjCInterfaceType : public ObjCObjectType { 3032 ObjCInterfaceDecl *Decl; 3033 3034 ObjCInterfaceType(const ObjCInterfaceDecl *D) 3035 : ObjCObjectType(Nonce_ObjCInterface), 3036 Decl(const_cast<ObjCInterfaceDecl*>(D)) {} 3037 friend class ASTContext; // ASTContext creates these. 3038public: 3039 void Destroy(ASTContext& C); // key function 3040 3041 /// getDecl - Get the declaration of this interface. 3042 ObjCInterfaceDecl *getDecl() const { return Decl; } 3043 3044 bool isSugared() const { return false; } 3045 QualType desugar() const { return QualType(this, 0); } 3046 3047 static bool classof(const Type *T) { 3048 return T->getTypeClass() == ObjCInterface; 3049 } 3050 static bool classof(const ObjCInterfaceType *) { return true; } 3051 3052 // Nonsense to "hide" certain members of ObjCObjectType within this 3053 // class. People asking for protocols on an ObjCInterfaceType are 3054 // not going to get what they want: ObjCInterfaceTypes are 3055 // guaranteed to have no protocols. 3056 enum { 3057 qual_iterator, 3058 qual_begin, 3059 qual_end, 3060 getNumProtocols, 3061 getProtocol 3062 }; 3063}; 3064 3065inline ObjCInterfaceDecl *ObjCObjectType::getInterface() const { 3066 if (const ObjCInterfaceType *T = 3067 getBaseType()->getAs<ObjCInterfaceType>()) 3068 return T->getDecl(); 3069 return 0; 3070} 3071 3072/// ObjCObjectPointerType - Used to represent a pointer to an 3073/// Objective C object. These are constructed from pointer 3074/// declarators when the pointee type is an ObjCObjectType (or sugar 3075/// for one). In addition, the 'id' and 'Class' types are typedefs 3076/// for these, and the protocol-qualified types 'id<P>' and 'Class<P>' 3077/// are translated into these. 3078/// 3079/// Pointers to pointers to Objective C objects are still PointerTypes; 3080/// only the first level of pointer gets it own type implementation. 3081class ObjCObjectPointerType : public Type, public llvm::FoldingSetNode { 3082 QualType PointeeType; 3083 3084 ObjCObjectPointerType(QualType Canonical, QualType Pointee) 3085 : Type(ObjCObjectPointer, Canonical, false), 3086 PointeeType(Pointee) {} 3087 friend class ASTContext; // ASTContext creates these. 3088 3089protected: 3090 virtual Linkage getLinkageImpl() const; 3091 3092public: 3093 void Destroy(ASTContext& C); 3094 3095 /// getPointeeType - Gets the type pointed to by this ObjC pointer. 3096 /// The result will always be an ObjCObjectType or sugar thereof. 3097 QualType getPointeeType() const { return PointeeType; } 3098 3099 /// getObjCObjectType - Gets the type pointed to by this ObjC 3100 /// pointer. This method always returns non-null. 3101 /// 3102 /// This method is equivalent to getPointeeType() except that 3103 /// it discards any typedefs (or other sugar) between this 3104 /// type and the "outermost" object type. So for: 3105 /// @class A; @protocol P; @protocol Q; 3106 /// typedef A<P> AP; 3107 /// typedef A A1; 3108 /// typedef A1<P> A1P; 3109 /// typedef A1P<Q> A1PQ; 3110 /// For 'A*', getObjectType() will return 'A'. 3111 /// For 'A<P>*', getObjectType() will return 'A<P>'. 3112 /// For 'AP*', getObjectType() will return 'A<P>'. 3113 /// For 'A1*', getObjectType() will return 'A'. 3114 /// For 'A1<P>*', getObjectType() will return 'A1<P>'. 3115 /// For 'A1P*', getObjectType() will return 'A1<P>'. 3116 /// For 'A1PQ*', getObjectType() will return 'A1<Q>', because 3117 /// adding protocols to a protocol-qualified base discards the 3118 /// old qualifiers (for now). But if it didn't, getObjectType() 3119 /// would return 'A1P<Q>' (and we'd have to make iterating over 3120 /// qualifiers more complicated). 3121 const ObjCObjectType *getObjectType() const { 3122 return PointeeType->getAs<ObjCObjectType>(); 3123 } 3124 3125 /// getInterfaceType - If this pointer points to an Objective C 3126 /// @interface type, gets the type for that interface. Any protocol 3127 /// qualifiers on the interface are ignored. 3128 /// 3129 /// \return null if the base type for this pointer is 'id' or 'Class' 3130 const ObjCInterfaceType *getInterfaceType() const { 3131 return getObjectType()->getBaseType()->getAs<ObjCInterfaceType>(); 3132 } 3133 3134 /// getInterfaceDecl - If this pointer points to an Objective @interface 3135 /// type, gets the declaration for that interface. 3136 /// 3137 /// \return null if the base type for this pointer is 'id' or 'Class' 3138 ObjCInterfaceDecl *getInterfaceDecl() const { 3139 return getObjectType()->getInterface(); 3140 } 3141 3142 /// isObjCIdType - True if this is equivalent to the 'id' type, i.e. if 3143 /// its object type is the primitive 'id' type with no protocols. 3144 bool isObjCIdType() const { 3145 return getObjectType()->isObjCUnqualifiedId(); 3146 } 3147 3148 /// isObjCClassType - True if this is equivalent to the 'Class' type, 3149 /// i.e. if its object tive is the primitive 'Class' type with no protocols. 3150 bool isObjCClassType() const { 3151 return getObjectType()->isObjCUnqualifiedClass(); 3152 } 3153 3154 /// isObjCQualifiedIdType - True if this is equivalent to 'id<P>' for some 3155 /// non-empty set of protocols. 3156 bool isObjCQualifiedIdType() const { 3157 return getObjectType()->isObjCQualifiedId(); 3158 } 3159 3160 /// isObjCQualifiedClassType - True if this is equivalent to 'Class<P>' for 3161 /// some non-empty set of protocols. 3162 bool isObjCQualifiedClassType() const { 3163 return getObjectType()->isObjCQualifiedClass(); 3164 } 3165 3166 /// An iterator over the qualifiers on the object type. Provided 3167 /// for convenience. This will always iterate over the full set of 3168 /// protocols on a type, not just those provided directly. 3169 typedef ObjCObjectType::qual_iterator qual_iterator; 3170 3171 qual_iterator qual_begin() const { 3172 return getObjectType()->qual_begin(); 3173 } 3174 qual_iterator qual_end() const { 3175 return getObjectType()->qual_end(); 3176 } 3177 bool qual_empty() const { return getObjectType()->qual_empty(); } 3178 3179 /// getNumProtocols - Return the number of qualifying protocols on 3180 /// the object type. 3181 unsigned getNumProtocols() const { 3182 return getObjectType()->getNumProtocols(); 3183 } 3184 3185 /// \brief Retrieve a qualifying protocol by index on the object 3186 /// type. 3187 ObjCProtocolDecl *getProtocol(unsigned I) const { 3188 return getObjectType()->getProtocol(I); 3189 } 3190 3191 bool isSugared() const { return false; } 3192 QualType desugar() const { return QualType(this, 0); } 3193 3194 void Profile(llvm::FoldingSetNodeID &ID) { 3195 Profile(ID, getPointeeType()); 3196 } 3197 static void Profile(llvm::FoldingSetNodeID &ID, QualType T) { 3198 ID.AddPointer(T.getAsOpaquePtr()); 3199 } 3200 static bool classof(const Type *T) { 3201 return T->getTypeClass() == ObjCObjectPointer; 3202 } 3203 static bool classof(const ObjCObjectPointerType *) { return true; } 3204}; 3205 3206/// A qualifier set is used to build a set of qualifiers. 3207class QualifierCollector : public Qualifiers { 3208 ASTContext *Context; 3209 3210public: 3211 QualifierCollector(Qualifiers Qs = Qualifiers()) 3212 : Qualifiers(Qs), Context(0) {} 3213 QualifierCollector(ASTContext &Context, Qualifiers Qs = Qualifiers()) 3214 : Qualifiers(Qs), Context(&Context) {} 3215 3216 void setContext(ASTContext &C) { Context = &C; } 3217 3218 /// Collect any qualifiers on the given type and return an 3219 /// unqualified type. 3220 const Type *strip(QualType QT) { 3221 addFastQualifiers(QT.getLocalFastQualifiers()); 3222 if (QT.hasLocalNonFastQualifiers()) { 3223 const ExtQuals *EQ = QT.getExtQualsUnsafe(); 3224 Context = &EQ->getContext(); 3225 addQualifiers(EQ->getQualifiers()); 3226 return EQ->getBaseType(); 3227 } 3228 return QT.getTypePtrUnsafe(); 3229 } 3230 3231 /// Apply the collected qualifiers to the given type. 3232 QualType apply(QualType QT) const; 3233 3234 /// Apply the collected qualifiers to the given type. 3235 QualType apply(const Type* T) const; 3236 3237}; 3238 3239 3240// Inline function definitions. 3241 3242inline bool QualType::isCanonical() const { 3243 const Type *T = getTypePtr(); 3244 if (hasLocalQualifiers()) 3245 return T->isCanonicalUnqualified() && !isa<ArrayType>(T); 3246 return T->isCanonicalUnqualified(); 3247} 3248 3249inline bool QualType::isCanonicalAsParam() const { 3250 if (hasLocalQualifiers()) return false; 3251 const Type *T = getTypePtr(); 3252 return T->isCanonicalUnqualified() && 3253 !isa<FunctionType>(T) && !isa<ArrayType>(T); 3254} 3255 3256inline bool QualType::isConstQualified() const { 3257 return isLocalConstQualified() || 3258 getTypePtr()->getCanonicalTypeInternal().isLocalConstQualified(); 3259} 3260 3261inline bool QualType::isRestrictQualified() const { 3262 return isLocalRestrictQualified() || 3263 getTypePtr()->getCanonicalTypeInternal().isLocalRestrictQualified(); 3264} 3265 3266 3267inline bool QualType::isVolatileQualified() const { 3268 return isLocalVolatileQualified() || 3269 getTypePtr()->getCanonicalTypeInternal().isLocalVolatileQualified(); 3270} 3271 3272inline bool QualType::hasQualifiers() const { 3273 return hasLocalQualifiers() || 3274 getTypePtr()->getCanonicalTypeInternal().hasLocalQualifiers(); 3275} 3276 3277inline Qualifiers QualType::getQualifiers() const { 3278 Qualifiers Quals = getLocalQualifiers(); 3279 Quals.addQualifiers( 3280 getTypePtr()->getCanonicalTypeInternal().getLocalQualifiers()); 3281 return Quals; 3282} 3283 3284inline unsigned QualType::getCVRQualifiers() const { 3285 return getLocalCVRQualifiers() | 3286 getTypePtr()->getCanonicalTypeInternal().getLocalCVRQualifiers(); 3287} 3288 3289/// getCVRQualifiersThroughArrayTypes - If there are CVR qualifiers for this 3290/// type, returns them. Otherwise, if this is an array type, recurses 3291/// on the element type until some qualifiers have been found or a non-array 3292/// type reached. 3293inline unsigned QualType::getCVRQualifiersThroughArrayTypes() const { 3294 if (unsigned Quals = getCVRQualifiers()) 3295 return Quals; 3296 QualType CT = getTypePtr()->getCanonicalTypeInternal(); 3297 if (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 3298 return AT->getElementType().getCVRQualifiersThroughArrayTypes(); 3299 return 0; 3300} 3301 3302inline void QualType::removeConst() { 3303 removeFastQualifiers(Qualifiers::Const); 3304} 3305 3306inline void QualType::removeRestrict() { 3307 removeFastQualifiers(Qualifiers::Restrict); 3308} 3309 3310inline void QualType::removeVolatile() { 3311 QualifierCollector Qc; 3312 const Type *Ty = Qc.strip(*this); 3313 if (Qc.hasVolatile()) { 3314 Qc.removeVolatile(); 3315 *this = Qc.apply(Ty); 3316 } 3317} 3318 3319inline void QualType::removeCVRQualifiers(unsigned Mask) { 3320 assert(!(Mask & ~Qualifiers::CVRMask) && "mask has non-CVR bits"); 3321 3322 // Fast path: we don't need to touch the slow qualifiers. 3323 if (!(Mask & ~Qualifiers::FastMask)) { 3324 removeFastQualifiers(Mask); 3325 return; 3326 } 3327 3328 QualifierCollector Qc; 3329 const Type *Ty = Qc.strip(*this); 3330 Qc.removeCVRQualifiers(Mask); 3331 *this = Qc.apply(Ty); 3332} 3333 3334/// getAddressSpace - Return the address space of this type. 3335inline unsigned QualType::getAddressSpace() const { 3336 if (hasLocalNonFastQualifiers()) { 3337 const ExtQuals *EQ = getExtQualsUnsafe(); 3338 if (EQ->hasAddressSpace()) 3339 return EQ->getAddressSpace(); 3340 } 3341 3342 QualType CT = getTypePtr()->getCanonicalTypeInternal(); 3343 if (CT.hasLocalNonFastQualifiers()) { 3344 const ExtQuals *EQ = CT.getExtQualsUnsafe(); 3345 if (EQ->hasAddressSpace()) 3346 return EQ->getAddressSpace(); 3347 } 3348 3349 if (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 3350 return AT->getElementType().getAddressSpace(); 3351 if (const RecordType *RT = dyn_cast<RecordType>(CT)) 3352 return RT->getAddressSpace(); 3353 return 0; 3354} 3355 3356/// getObjCGCAttr - Return the gc attribute of this type. 3357inline Qualifiers::GC QualType::getObjCGCAttr() const { 3358 if (hasLocalNonFastQualifiers()) { 3359 const ExtQuals *EQ = getExtQualsUnsafe(); 3360 if (EQ->hasObjCGCAttr()) 3361 return EQ->getObjCGCAttr(); 3362 } 3363 3364 QualType CT = getTypePtr()->getCanonicalTypeInternal(); 3365 if (CT.hasLocalNonFastQualifiers()) { 3366 const ExtQuals *EQ = CT.getExtQualsUnsafe(); 3367 if (EQ->hasObjCGCAttr()) 3368 return EQ->getObjCGCAttr(); 3369 } 3370 3371 if (const ArrayType *AT = dyn_cast<ArrayType>(CT)) 3372 return AT->getElementType().getObjCGCAttr(); 3373 if (const ObjCObjectPointerType *PT = CT->getAs<ObjCObjectPointerType>()) 3374 return PT->getPointeeType().getObjCGCAttr(); 3375 // We most look at all pointer types, not just pointer to interface types. 3376 if (const PointerType *PT = CT->getAs<PointerType>()) 3377 return PT->getPointeeType().getObjCGCAttr(); 3378 return Qualifiers::GCNone; 3379} 3380 3381inline FunctionType::ExtInfo getFunctionExtInfo(const Type &t) { 3382 if (const PointerType *PT = t.getAs<PointerType>()) { 3383 if (const FunctionType *FT = PT->getPointeeType()->getAs<FunctionType>()) 3384 return FT->getExtInfo(); 3385 } else if (const FunctionType *FT = t.getAs<FunctionType>()) 3386 return FT->getExtInfo(); 3387 3388 return FunctionType::ExtInfo(); 3389} 3390 3391inline FunctionType::ExtInfo getFunctionExtInfo(QualType t) { 3392 return getFunctionExtInfo(*t); 3393} 3394 3395/// \brief Determine whether this set of qualifiers is a superset of the given 3396/// set of qualifiers. 3397inline bool Qualifiers::isSupersetOf(Qualifiers Other) const { 3398 return Mask != Other.Mask && (Mask | Other.Mask) == Mask; 3399} 3400 3401/// isMoreQualifiedThan - Determine whether this type is more 3402/// qualified than the Other type. For example, "const volatile int" 3403/// is more qualified than "const int", "volatile int", and 3404/// "int". However, it is not more qualified than "const volatile 3405/// int". 3406inline bool QualType::isMoreQualifiedThan(QualType Other) const { 3407 // FIXME: work on arbitrary qualifiers 3408 unsigned MyQuals = this->getCVRQualifiersThroughArrayTypes(); 3409 unsigned OtherQuals = Other.getCVRQualifiersThroughArrayTypes(); 3410 if (getAddressSpace() != Other.getAddressSpace()) 3411 return false; 3412 return MyQuals != OtherQuals && (MyQuals | OtherQuals) == MyQuals; 3413} 3414 3415/// isAtLeastAsQualifiedAs - Determine whether this type is at last 3416/// as qualified as the Other type. For example, "const volatile 3417/// int" is at least as qualified as "const int", "volatile int", 3418/// "int", and "const volatile int". 3419inline bool QualType::isAtLeastAsQualifiedAs(QualType Other) const { 3420 // FIXME: work on arbitrary qualifiers 3421 unsigned MyQuals = this->getCVRQualifiersThroughArrayTypes(); 3422 unsigned OtherQuals = Other.getCVRQualifiersThroughArrayTypes(); 3423 if (getAddressSpace() != Other.getAddressSpace()) 3424 return false; 3425 return (MyQuals | OtherQuals) == MyQuals; 3426} 3427 3428/// getNonReferenceType - If Type is a reference type (e.g., const 3429/// int&), returns the type that the reference refers to ("const 3430/// int"). Otherwise, returns the type itself. This routine is used 3431/// throughout Sema to implement C++ 5p6: 3432/// 3433/// If an expression initially has the type "reference to T" (8.3.2, 3434/// 8.5.3), the type is adjusted to "T" prior to any further 3435/// analysis, the expression designates the object or function 3436/// denoted by the reference, and the expression is an lvalue. 3437inline QualType QualType::getNonReferenceType() const { 3438 if (const ReferenceType *RefType = (*this)->getAs<ReferenceType>()) 3439 return RefType->getPointeeType(); 3440 else 3441 return *this; 3442} 3443 3444inline bool Type::isFunctionType() const { 3445 return isa<FunctionType>(CanonicalType); 3446} 3447inline bool Type::isPointerType() const { 3448 return isa<PointerType>(CanonicalType); 3449} 3450inline bool Type::isAnyPointerType() const { 3451 return isPointerType() || isObjCObjectPointerType(); 3452} 3453inline bool Type::isBlockPointerType() const { 3454 return isa<BlockPointerType>(CanonicalType); 3455} 3456inline bool Type::isReferenceType() const { 3457 return isa<ReferenceType>(CanonicalType); 3458} 3459inline bool Type::isLValueReferenceType() const { 3460 return isa<LValueReferenceType>(CanonicalType); 3461} 3462inline bool Type::isRValueReferenceType() const { 3463 return isa<RValueReferenceType>(CanonicalType); 3464} 3465inline bool Type::isFunctionPointerType() const { 3466 if (const PointerType* T = getAs<PointerType>()) 3467 return T->getPointeeType()->isFunctionType(); 3468 else 3469 return false; 3470} 3471inline bool Type::isMemberPointerType() const { 3472 return isa<MemberPointerType>(CanonicalType); 3473} 3474inline bool Type::isMemberFunctionPointerType() const { 3475 if (const MemberPointerType* T = getAs<MemberPointerType>()) 3476 return T->getPointeeType()->isFunctionType(); 3477 else 3478 return false; 3479} 3480inline bool Type::isArrayType() const { 3481 return isa<ArrayType>(CanonicalType); 3482} 3483inline bool Type::isConstantArrayType() const { 3484 return isa<ConstantArrayType>(CanonicalType); 3485} 3486inline bool Type::isIncompleteArrayType() const { 3487 return isa<IncompleteArrayType>(CanonicalType); 3488} 3489inline bool Type::isVariableArrayType() const { 3490 return isa<VariableArrayType>(CanonicalType); 3491} 3492inline bool Type::isDependentSizedArrayType() const { 3493 return isa<DependentSizedArrayType>(CanonicalType); 3494} 3495inline bool Type::isRecordType() const { 3496 return isa<RecordType>(CanonicalType); 3497} 3498inline bool Type::isAnyComplexType() const { 3499 return isa<ComplexType>(CanonicalType); 3500} 3501inline bool Type::isVectorType() const { 3502 return isa<VectorType>(CanonicalType); 3503} 3504inline bool Type::isExtVectorType() const { 3505 return isa<ExtVectorType>(CanonicalType); 3506} 3507inline bool Type::isObjCObjectPointerType() const { 3508 return isa<ObjCObjectPointerType>(CanonicalType); 3509} 3510inline bool Type::isObjCObjectType() const { 3511 return isa<ObjCObjectType>(CanonicalType); 3512} 3513inline bool Type::isObjCQualifiedIdType() const { 3514 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 3515 return OPT->isObjCQualifiedIdType(); 3516 return false; 3517} 3518inline bool Type::isObjCQualifiedClassType() const { 3519 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 3520 return OPT->isObjCQualifiedClassType(); 3521 return false; 3522} 3523inline bool Type::isObjCIdType() const { 3524 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 3525 return OPT->isObjCIdType(); 3526 return false; 3527} 3528inline bool Type::isObjCClassType() const { 3529 if (const ObjCObjectPointerType *OPT = getAs<ObjCObjectPointerType>()) 3530 return OPT->isObjCClassType(); 3531 return false; 3532} 3533inline bool Type::isObjCSelType() const { 3534 if (const PointerType *OPT = getAs<PointerType>()) 3535 return OPT->getPointeeType()->isSpecificBuiltinType(BuiltinType::ObjCSel); 3536 return false; 3537} 3538inline bool Type::isObjCBuiltinType() const { 3539 return isObjCIdType() || isObjCClassType() || isObjCSelType(); 3540} 3541inline bool Type::isTemplateTypeParmType() const { 3542 return isa<TemplateTypeParmType>(CanonicalType); 3543} 3544 3545inline bool Type::isBuiltinType() const { 3546 return getAs<BuiltinType>(); 3547} 3548 3549inline bool Type::isSpecificBuiltinType(unsigned K) const { 3550 if (const BuiltinType *BT = getAs<BuiltinType>()) 3551 if (BT->getKind() == (BuiltinType::Kind) K) 3552 return true; 3553 return false; 3554} 3555 3556/// \brief Determines whether this is a type for which one can define 3557/// an overloaded operator. 3558inline bool Type::isOverloadableType() const { 3559 return isDependentType() || isRecordType() || isEnumeralType(); 3560} 3561 3562inline bool Type::hasPointerRepresentation() const { 3563 return (isPointerType() || isReferenceType() || isBlockPointerType() || 3564 isObjCObjectPointerType() || isNullPtrType()); 3565} 3566 3567inline bool Type::hasObjCPointerRepresentation() const { 3568 return isObjCObjectPointerType(); 3569} 3570 3571/// Insertion operator for diagnostics. This allows sending QualType's into a 3572/// diagnostic with <<. 3573inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB, 3574 QualType T) { 3575 DB.AddTaggedVal(reinterpret_cast<intptr_t>(T.getAsOpaquePtr()), 3576 Diagnostic::ak_qualtype); 3577 return DB; 3578} 3579 3580/// Insertion operator for partial diagnostics. This allows sending QualType's 3581/// into a diagnostic with <<. 3582inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD, 3583 QualType T) { 3584 PD.AddTaggedVal(reinterpret_cast<intptr_t>(T.getAsOpaquePtr()), 3585 Diagnostic::ak_qualtype); 3586 return PD; 3587} 3588 3589// Helper class template that is used by Type::getAs to ensure that one does 3590// not try to look through a qualified type to get to an array type. 3591template<typename T, 3592 bool isArrayType = (llvm::is_same<T, ArrayType>::value || 3593 llvm::is_base_of<ArrayType, T>::value)> 3594struct ArrayType_cannot_be_used_with_getAs { }; 3595 3596template<typename T> 3597struct ArrayType_cannot_be_used_with_getAs<T, true>; 3598 3599/// Member-template getAs<specific type>'. 3600template <typename T> const T *Type::getAs() const { 3601 ArrayType_cannot_be_used_with_getAs<T> at; 3602 (void)at; 3603 3604 // If this is directly a T type, return it. 3605 if (const T *Ty = dyn_cast<T>(this)) 3606 return Ty; 3607 3608 // If the canonical form of this type isn't the right kind, reject it. 3609 if (!isa<T>(CanonicalType)) 3610 return 0; 3611 3612 // If this is a typedef for the type, strip the typedef off without 3613 // losing all typedef information. 3614 return cast<T>(getUnqualifiedDesugaredType()); 3615} 3616 3617} // end namespace clang 3618 3619#endif 3620