Expr.h revision 993f43f24d7a45a5cd4678a3316b0852261fc5d4
1//===--- Expr.h - Classes for representing expressions ----------*- 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 Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/ASTVector.h" 19#include "clang/AST/Decl.h" 20#include "clang/AST/DeclAccessPair.h" 21#include "clang/AST/OperationKinds.h" 22#include "clang/AST/Stmt.h" 23#include "clang/AST/TemplateBase.h" 24#include "clang/AST/Type.h" 25#include "clang/Basic/CharInfo.h" 26#include "clang/Basic/TypeTraits.h" 27#include "llvm/ADT/APFloat.h" 28#include "llvm/ADT/APSInt.h" 29#include "llvm/ADT/SmallVector.h" 30#include "llvm/ADT/StringRef.h" 31#include "llvm/Support/Compiler.h" 32 33namespace clang { 34 class APValue; 35 class ASTContext; 36 class BlockDecl; 37 class CXXBaseSpecifier; 38 class CXXMemberCallExpr; 39 class CXXOperatorCallExpr; 40 class CastExpr; 41 class Decl; 42 class IdentifierInfo; 43 class MaterializeTemporaryExpr; 44 class NamedDecl; 45 class ObjCPropertyRefExpr; 46 class OpaqueValueExpr; 47 class ParmVarDecl; 48 class TargetInfo; 49 class ValueDecl; 50 51/// \brief A simple array of base specifiers. 52typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 53 54/// \brief An adjustment to be made to the temporary created when emitting a 55/// reference binding, which accesses a particular subobject of that temporary. 56struct SubobjectAdjustment { 57 enum { 58 DerivedToBaseAdjustment, 59 FieldAdjustment, 60 MemberPointerAdjustment 61 } Kind; 62 63 64 struct DTB { 65 const CastExpr *BasePath; 66 const CXXRecordDecl *DerivedClass; 67 }; 68 69 struct P { 70 const MemberPointerType *MPT; 71 Expr *RHS; 72 }; 73 74 union { 75 struct DTB DerivedToBase; 76 FieldDecl *Field; 77 struct P Ptr; 78 }; 79 80 SubobjectAdjustment(const CastExpr *BasePath, 81 const CXXRecordDecl *DerivedClass) 82 : Kind(DerivedToBaseAdjustment) { 83 DerivedToBase.BasePath = BasePath; 84 DerivedToBase.DerivedClass = DerivedClass; 85 } 86 87 SubobjectAdjustment(FieldDecl *Field) 88 : Kind(FieldAdjustment) { 89 this->Field = Field; 90 } 91 92 SubobjectAdjustment(const MemberPointerType *MPT, Expr *RHS) 93 : Kind(MemberPointerAdjustment) { 94 this->Ptr.MPT = MPT; 95 this->Ptr.RHS = RHS; 96 } 97}; 98 99/// Expr - This represents one expression. Note that Expr's are subclasses of 100/// Stmt. This allows an expression to be transparently used any place a Stmt 101/// is required. 102/// 103class Expr : public Stmt { 104 QualType TR; 105 106protected: 107 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 108 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 109 : Stmt(SC) 110 { 111 ExprBits.TypeDependent = TD; 112 ExprBits.ValueDependent = VD; 113 ExprBits.InstantiationDependent = ID; 114 ExprBits.ValueKind = VK; 115 ExprBits.ObjectKind = OK; 116 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 117 setType(T); 118 } 119 120 /// \brief Construct an empty expression. 121 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 122 123public: 124 QualType getType() const { return TR; } 125 void setType(QualType t) { 126 // In C++, the type of an expression is always adjusted so that it 127 // will not have reference type an expression will never have 128 // reference type (C++ [expr]p6). Use 129 // QualType::getNonReferenceType() to retrieve the non-reference 130 // type. Additionally, inspect Expr::isLvalue to determine whether 131 // an expression that is adjusted in this manner should be 132 // considered an lvalue. 133 assert((t.isNull() || !t->isReferenceType()) && 134 "Expressions can't have reference type"); 135 136 TR = t; 137 } 138 139 /// isValueDependent - Determines whether this expression is 140 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 141 /// array bound of "Chars" in the following example is 142 /// value-dependent. 143 /// @code 144 /// template<int Size, char (&Chars)[Size]> struct meta_string; 145 /// @endcode 146 bool isValueDependent() const { return ExprBits.ValueDependent; } 147 148 /// \brief Set whether this expression is value-dependent or not. 149 void setValueDependent(bool VD) { 150 ExprBits.ValueDependent = VD; 151 if (VD) 152 ExprBits.InstantiationDependent = true; 153 } 154 155 /// isTypeDependent - Determines whether this expression is 156 /// type-dependent (C++ [temp.dep.expr]), which means that its type 157 /// could change from one template instantiation to the next. For 158 /// example, the expressions "x" and "x + y" are type-dependent in 159 /// the following code, but "y" is not type-dependent: 160 /// @code 161 /// template<typename T> 162 /// void add(T x, int y) { 163 /// x + y; 164 /// } 165 /// @endcode 166 bool isTypeDependent() const { return ExprBits.TypeDependent; } 167 168 /// \brief Set whether this expression is type-dependent or not. 169 void setTypeDependent(bool TD) { 170 ExprBits.TypeDependent = TD; 171 if (TD) 172 ExprBits.InstantiationDependent = true; 173 } 174 175 /// \brief Whether this expression is instantiation-dependent, meaning that 176 /// it depends in some way on a template parameter, even if neither its type 177 /// nor (constant) value can change due to the template instantiation. 178 /// 179 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 180 /// instantiation-dependent (since it involves a template parameter \c T), but 181 /// is neither type- nor value-dependent, since the type of the inner 182 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 183 /// \c sizeof is known. 184 /// 185 /// \code 186 /// template<typename T> 187 /// void f(T x, T y) { 188 /// sizeof(sizeof(T() + T()); 189 /// } 190 /// \endcode 191 /// 192 bool isInstantiationDependent() const { 193 return ExprBits.InstantiationDependent; 194 } 195 196 /// \brief Set whether this expression is instantiation-dependent or not. 197 void setInstantiationDependent(bool ID) { 198 ExprBits.InstantiationDependent = ID; 199 } 200 201 /// \brief Whether this expression contains an unexpanded parameter 202 /// pack (for C++11 variadic templates). 203 /// 204 /// Given the following function template: 205 /// 206 /// \code 207 /// template<typename F, typename ...Types> 208 /// void forward(const F &f, Types &&...args) { 209 /// f(static_cast<Types&&>(args)...); 210 /// } 211 /// \endcode 212 /// 213 /// The expressions \c args and \c static_cast<Types&&>(args) both 214 /// contain parameter packs. 215 bool containsUnexpandedParameterPack() const { 216 return ExprBits.ContainsUnexpandedParameterPack; 217 } 218 219 /// \brief Set the bit that describes whether this expression 220 /// contains an unexpanded parameter pack. 221 void setContainsUnexpandedParameterPack(bool PP = true) { 222 ExprBits.ContainsUnexpandedParameterPack = PP; 223 } 224 225 /// getExprLoc - Return the preferred location for the arrow when diagnosing 226 /// a problem with a generic expression. 227 SourceLocation getExprLoc() const LLVM_READONLY; 228 229 /// isUnusedResultAWarning - Return true if this immediate expression should 230 /// be warned about if the result is unused. If so, fill in expr, location, 231 /// and ranges with expr to warn on and source locations/ranges appropriate 232 /// for a warning. 233 bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc, 234 SourceRange &R1, SourceRange &R2, 235 ASTContext &Ctx) const; 236 237 /// isLValue - True if this expression is an "l-value" according to 238 /// the rules of the current language. C and C++ give somewhat 239 /// different rules for this concept, but in general, the result of 240 /// an l-value expression identifies a specific object whereas the 241 /// result of an r-value expression is a value detached from any 242 /// specific storage. 243 /// 244 /// C++11 divides the concept of "r-value" into pure r-values 245 /// ("pr-values") and so-called expiring values ("x-values"), which 246 /// identify specific objects that can be safely cannibalized for 247 /// their resources. This is an unfortunate abuse of terminology on 248 /// the part of the C++ committee. In Clang, when we say "r-value", 249 /// we generally mean a pr-value. 250 bool isLValue() const { return getValueKind() == VK_LValue; } 251 bool isRValue() const { return getValueKind() == VK_RValue; } 252 bool isXValue() const { return getValueKind() == VK_XValue; } 253 bool isGLValue() const { return getValueKind() != VK_RValue; } 254 255 enum LValueClassification { 256 LV_Valid, 257 LV_NotObjectType, 258 LV_IncompleteVoidType, 259 LV_DuplicateVectorComponents, 260 LV_InvalidExpression, 261 LV_InvalidMessageExpression, 262 LV_MemberFunction, 263 LV_SubObjCPropertySetting, 264 LV_ClassTemporary, 265 LV_ArrayTemporary 266 }; 267 /// Reasons why an expression might not be an l-value. 268 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 269 270 enum isModifiableLvalueResult { 271 MLV_Valid, 272 MLV_NotObjectType, 273 MLV_IncompleteVoidType, 274 MLV_DuplicateVectorComponents, 275 MLV_InvalidExpression, 276 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 277 MLV_IncompleteType, 278 MLV_ConstQualified, 279 MLV_ArrayType, 280 MLV_ReadonlyProperty, 281 MLV_NoSetterProperty, 282 MLV_MemberFunction, 283 MLV_SubObjCPropertySetting, 284 MLV_InvalidMessageExpression, 285 MLV_ClassTemporary, 286 MLV_ArrayTemporary 287 }; 288 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 289 /// does not have an incomplete type, does not have a const-qualified type, 290 /// and if it is a structure or union, does not have any member (including, 291 /// recursively, any member or element of all contained aggregates or unions) 292 /// with a const-qualified type. 293 /// 294 /// \param Loc [in,out] - A source location which *may* be filled 295 /// in with the location of the expression making this a 296 /// non-modifiable lvalue, if specified. 297 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 298 SourceLocation *Loc = 0) const; 299 300 /// \brief The return type of classify(). Represents the C++11 expression 301 /// taxonomy. 302 class Classification { 303 public: 304 /// \brief The various classification results. Most of these mean prvalue. 305 enum Kinds { 306 CL_LValue, 307 CL_XValue, 308 CL_Function, // Functions cannot be lvalues in C. 309 CL_Void, // Void cannot be an lvalue in C. 310 CL_AddressableVoid, // Void expression whose address can be taken in C. 311 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 312 CL_MemberFunction, // An expression referring to a member function 313 CL_SubObjCPropertySetting, 314 CL_ClassTemporary, // A temporary of class type, or subobject thereof. 315 CL_ArrayTemporary, // A temporary of array type. 316 CL_ObjCMessageRValue, // ObjC message is an rvalue 317 CL_PRValue // A prvalue for any other reason, of any other type 318 }; 319 /// \brief The results of modification testing. 320 enum ModifiableType { 321 CM_Untested, // testModifiable was false. 322 CM_Modifiable, 323 CM_RValue, // Not modifiable because it's an rvalue 324 CM_Function, // Not modifiable because it's a function; C++ only 325 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 326 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 327 CM_ConstQualified, 328 CM_ArrayType, 329 CM_IncompleteType 330 }; 331 332 private: 333 friend class Expr; 334 335 unsigned short Kind; 336 unsigned short Modifiable; 337 338 explicit Classification(Kinds k, ModifiableType m) 339 : Kind(k), Modifiable(m) 340 {} 341 342 public: 343 Classification() {} 344 345 Kinds getKind() const { return static_cast<Kinds>(Kind); } 346 ModifiableType getModifiable() const { 347 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 348 return static_cast<ModifiableType>(Modifiable); 349 } 350 bool isLValue() const { return Kind == CL_LValue; } 351 bool isXValue() const { return Kind == CL_XValue; } 352 bool isGLValue() const { return Kind <= CL_XValue; } 353 bool isPRValue() const { return Kind >= CL_Function; } 354 bool isRValue() const { return Kind >= CL_XValue; } 355 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 356 357 /// \brief Create a simple, modifiably lvalue 358 static Classification makeSimpleLValue() { 359 return Classification(CL_LValue, CM_Modifiable); 360 } 361 362 }; 363 /// \brief Classify - Classify this expression according to the C++11 364 /// expression taxonomy. 365 /// 366 /// C++11 defines ([basic.lval]) a new taxonomy of expressions to replace the 367 /// old lvalue vs rvalue. This function determines the type of expression this 368 /// is. There are three expression types: 369 /// - lvalues are classical lvalues as in C++03. 370 /// - prvalues are equivalent to rvalues in C++03. 371 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 372 /// function returning an rvalue reference. 373 /// lvalues and xvalues are collectively referred to as glvalues, while 374 /// prvalues and xvalues together form rvalues. 375 Classification Classify(ASTContext &Ctx) const { 376 return ClassifyImpl(Ctx, 0); 377 } 378 379 /// \brief ClassifyModifiable - Classify this expression according to the 380 /// C++11 expression taxonomy, and see if it is valid on the left side 381 /// of an assignment. 382 /// 383 /// This function extends classify in that it also tests whether the 384 /// expression is modifiable (C99 6.3.2.1p1). 385 /// \param Loc A source location that might be filled with a relevant location 386 /// if the expression is not modifiable. 387 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 388 return ClassifyImpl(Ctx, &Loc); 389 } 390 391 /// getValueKindForType - Given a formal return or parameter type, 392 /// give its value kind. 393 static ExprValueKind getValueKindForType(QualType T) { 394 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 395 return (isa<LValueReferenceType>(RT) 396 ? VK_LValue 397 : (RT->getPointeeType()->isFunctionType() 398 ? VK_LValue : VK_XValue)); 399 return VK_RValue; 400 } 401 402 /// getValueKind - The value kind that this expression produces. 403 ExprValueKind getValueKind() const { 404 return static_cast<ExprValueKind>(ExprBits.ValueKind); 405 } 406 407 /// getObjectKind - The object kind that this expression produces. 408 /// Object kinds are meaningful only for expressions that yield an 409 /// l-value or x-value. 410 ExprObjectKind getObjectKind() const { 411 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 412 } 413 414 bool isOrdinaryOrBitFieldObject() const { 415 ExprObjectKind OK = getObjectKind(); 416 return (OK == OK_Ordinary || OK == OK_BitField); 417 } 418 419 /// setValueKind - Set the value kind produced by this expression. 420 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 421 422 /// setObjectKind - Set the object kind produced by this expression. 423 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 424 425private: 426 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 427 428public: 429 430 /// \brief Returns true if this expression is a gl-value that 431 /// potentially refers to a bit-field. 432 /// 433 /// In C++, whether a gl-value refers to a bitfield is essentially 434 /// an aspect of the value-kind type system. 435 bool refersToBitField() const { return getObjectKind() == OK_BitField; } 436 437 /// \brief If this expression refers to a bit-field, retrieve the 438 /// declaration of that bit-field. 439 /// 440 /// Note that this returns a non-null pointer in subtly different 441 /// places than refersToBitField returns true. In particular, this can 442 /// return a non-null pointer even for r-values loaded from 443 /// bit-fields, but it will return null for a conditional bit-field. 444 FieldDecl *getSourceBitField(); 445 446 const FieldDecl *getSourceBitField() const { 447 return const_cast<Expr*>(this)->getSourceBitField(); 448 } 449 450 /// \brief If this expression is an l-value for an Objective C 451 /// property, find the underlying property reference expression. 452 const ObjCPropertyRefExpr *getObjCProperty() const; 453 454 /// \brief Check if this expression is the ObjC 'self' implicit parameter. 455 bool isObjCSelfExpr() const; 456 457 /// \brief Returns whether this expression refers to a vector element. 458 bool refersToVectorElement() const; 459 460 /// \brief Returns whether this expression has a placeholder type. 461 bool hasPlaceholderType() const { 462 return getType()->isPlaceholderType(); 463 } 464 465 /// \brief Returns whether this expression has a specific placeholder type. 466 bool hasPlaceholderType(BuiltinType::Kind K) const { 467 assert(BuiltinType::isPlaceholderTypeKind(K)); 468 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 469 return BT->getKind() == K; 470 return false; 471 } 472 473 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 474 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 475 /// but also int expressions which are produced by things like comparisons in 476 /// C. 477 bool isKnownToHaveBooleanValue() const; 478 479 /// isIntegerConstantExpr - Return true if this expression is a valid integer 480 /// constant expression, and, if so, return its value in Result. If not a 481 /// valid i-c-e, return false and fill in Loc (if specified) with the location 482 /// of the invalid expression. 483 /// 484 /// Note: This does not perform the implicit conversions required by C++11 485 /// [expr.const]p5. 486 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 487 SourceLocation *Loc = 0, 488 bool isEvaluated = true) const; 489 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const; 490 491 /// isCXX98IntegralConstantExpr - Return true if this expression is an 492 /// integral constant expression in C++98. Can only be used in C++. 493 bool isCXX98IntegralConstantExpr(ASTContext &Ctx) const; 494 495 /// isCXX11ConstantExpr - Return true if this expression is a constant 496 /// expression in C++11. Can only be used in C++. 497 /// 498 /// Note: This does not perform the implicit conversions required by C++11 499 /// [expr.const]p5. 500 bool isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result = 0, 501 SourceLocation *Loc = 0) const; 502 503 /// isPotentialConstantExpr - Return true if this function's definition 504 /// might be usable in a constant expression in C++11, if it were marked 505 /// constexpr. Return false if the function can never produce a constant 506 /// expression, along with diagnostics describing why not. 507 static bool isPotentialConstantExpr(const FunctionDecl *FD, 508 SmallVectorImpl< 509 PartialDiagnosticAt> &Diags); 510 511 /// isConstantInitializer - Returns true if this expression can be emitted to 512 /// IR as a constant, and thus can be used as a constant initializer in C. 513 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 514 515 /// EvalStatus is a struct with detailed info about an evaluation in progress. 516 struct EvalStatus { 517 /// HasSideEffects - Whether the evaluated expression has side effects. 518 /// For example, (f() && 0) can be folded, but it still has side effects. 519 bool HasSideEffects; 520 521 /// Diag - If this is non-null, it will be filled in with a stack of notes 522 /// indicating why evaluation failed (or why it failed to produce a constant 523 /// expression). 524 /// If the expression is unfoldable, the notes will indicate why it's not 525 /// foldable. If the expression is foldable, but not a constant expression, 526 /// the notes will describes why it isn't a constant expression. If the 527 /// expression *is* a constant expression, no notes will be produced. 528 SmallVectorImpl<PartialDiagnosticAt> *Diag; 529 530 EvalStatus() : HasSideEffects(false), Diag(0) {} 531 532 // hasSideEffects - Return true if the evaluated expression has 533 // side effects. 534 bool hasSideEffects() const { 535 return HasSideEffects; 536 } 537 }; 538 539 /// EvalResult is a struct with detailed info about an evaluated expression. 540 struct EvalResult : EvalStatus { 541 /// Val - This is the value the expression can be folded to. 542 APValue Val; 543 544 // isGlobalLValue - Return true if the evaluated lvalue expression 545 // is global. 546 bool isGlobalLValue() const; 547 }; 548 549 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 550 /// an rvalue using any crazy technique (that has nothing to do with language 551 /// standards) that we want to, even if the expression has side-effects. If 552 /// this function returns true, it returns the folded constant in Result. If 553 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 554 /// applied. 555 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 556 557 /// EvaluateAsBooleanCondition - Return true if this is a constant 558 /// which we we can fold and convert to a boolean condition using 559 /// any crazy technique that we want to, even if the expression has 560 /// side-effects. 561 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 562 563 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects }; 564 565 /// EvaluateAsInt - Return true if this is a constant which we can fold and 566 /// convert to an integer, using any crazy technique that we want to. 567 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 568 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 569 570 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 571 /// constant folded without side-effects, but discard the result. 572 bool isEvaluatable(const ASTContext &Ctx) const; 573 574 /// HasSideEffects - This routine returns true for all those expressions 575 /// which have any effect other than producing a value. Example is a function 576 /// call, volatile variable read, or throwing an exception. 577 bool HasSideEffects(const ASTContext &Ctx) const; 578 579 /// \brief Determine whether this expression involves a call to any function 580 /// that is not trivial. 581 bool hasNonTrivialCall(ASTContext &Ctx); 582 583 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 584 /// integer. This must be called on an expression that constant folds to an 585 /// integer. 586 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx, 587 SmallVectorImpl<PartialDiagnosticAt> *Diag=0) const; 588 589 void EvaluateForOverflow(const ASTContext &Ctx, 590 SmallVectorImpl<PartialDiagnosticAt> *Diag) const; 591 592 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 593 /// lvalue with link time known address, with no side-effects. 594 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 595 596 /// EvaluateAsInitializer - Evaluate an expression as if it were the 597 /// initializer of the given declaration. Returns true if the initializer 598 /// can be folded to a constant, and produces any relevant notes. In C++11, 599 /// notes will be produced if the expression is not a constant expression. 600 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 601 const VarDecl *VD, 602 SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 603 604 /// \brief Enumeration used to describe the kind of Null pointer constant 605 /// returned from \c isNullPointerConstant(). 606 enum NullPointerConstantKind { 607 /// \brief Expression is not a Null pointer constant. 608 NPCK_NotNull = 0, 609 610 /// \brief Expression is a Null pointer constant built from a zero integer 611 /// expression that is not a simple, possibly parenthesized, zero literal. 612 /// C++ Core Issue 903 will classify these expressions as "not pointers" 613 /// once it is adopted. 614 /// http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#903 615 NPCK_ZeroExpression, 616 617 /// \brief Expression is a Null pointer constant built from a literal zero. 618 NPCK_ZeroLiteral, 619 620 /// \brief Expression is a C++11 nullptr. 621 NPCK_CXX11_nullptr, 622 623 /// \brief Expression is a GNU-style __null constant. 624 NPCK_GNUNull 625 }; 626 627 /// \brief Enumeration used to describe how \c isNullPointerConstant() 628 /// should cope with value-dependent expressions. 629 enum NullPointerConstantValueDependence { 630 /// \brief Specifies that the expression should never be value-dependent. 631 NPC_NeverValueDependent = 0, 632 633 /// \brief Specifies that a value-dependent expression of integral or 634 /// dependent type should be considered a null pointer constant. 635 NPC_ValueDependentIsNull, 636 637 /// \brief Specifies that a value-dependent expression should be considered 638 /// to never be a null pointer constant. 639 NPC_ValueDependentIsNotNull 640 }; 641 642 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 643 /// a Null pointer constant. The return value can further distinguish the 644 /// kind of NULL pointer constant that was detected. 645 NullPointerConstantKind isNullPointerConstant( 646 ASTContext &Ctx, 647 NullPointerConstantValueDependence NPC) const; 648 649 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 650 /// write barrier. 651 bool isOBJCGCCandidate(ASTContext &Ctx) const; 652 653 /// \brief Returns true if this expression is a bound member function. 654 bool isBoundMemberFunction(ASTContext &Ctx) const; 655 656 /// \brief Given an expression of bound-member type, find the type 657 /// of the member. Returns null if this is an *overloaded* bound 658 /// member expression. 659 static QualType findBoundMemberType(const Expr *expr); 660 661 /// IgnoreImpCasts - Skip past any implicit casts which might 662 /// surround this expression. Only skips ImplicitCastExprs. 663 Expr *IgnoreImpCasts() LLVM_READONLY; 664 665 /// IgnoreImplicit - Skip past any implicit AST nodes which might 666 /// surround this expression. 667 Expr *IgnoreImplicit() LLVM_READONLY { 668 return cast<Expr>(Stmt::IgnoreImplicit()); 669 } 670 671 const Expr *IgnoreImplicit() const LLVM_READONLY { 672 return const_cast<Expr*>(this)->IgnoreImplicit(); 673 } 674 675 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 676 /// its subexpression. If that subexpression is also a ParenExpr, 677 /// then this method recursively returns its subexpression, and so forth. 678 /// Otherwise, the method returns the current Expr. 679 Expr *IgnoreParens() LLVM_READONLY; 680 681 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 682 /// or CastExprs, returning their operand. 683 Expr *IgnoreParenCasts() LLVM_READONLY; 684 685 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 686 /// any ParenExpr or ImplicitCastExprs, returning their operand. 687 Expr *IgnoreParenImpCasts() LLVM_READONLY; 688 689 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 690 /// call to a conversion operator, return the argument. 691 Expr *IgnoreConversionOperator() LLVM_READONLY; 692 693 const Expr *IgnoreConversionOperator() const LLVM_READONLY { 694 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 695 } 696 697 const Expr *IgnoreParenImpCasts() const LLVM_READONLY { 698 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 699 } 700 701 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 702 /// CastExprs that represent lvalue casts, returning their operand. 703 Expr *IgnoreParenLValueCasts() LLVM_READONLY; 704 705 const Expr *IgnoreParenLValueCasts() const LLVM_READONLY { 706 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 707 } 708 709 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 710 /// value (including ptr->int casts of the same size). Strip off any 711 /// ParenExpr or CastExprs, returning their operand. 712 Expr *IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY; 713 714 /// Ignore parentheses and derived-to-base casts. 715 Expr *ignoreParenBaseCasts() LLVM_READONLY; 716 717 const Expr *ignoreParenBaseCasts() const LLVM_READONLY { 718 return const_cast<Expr*>(this)->ignoreParenBaseCasts(); 719 } 720 721 /// \brief Determine whether this expression is a default function argument. 722 /// 723 /// Default arguments are implicitly generated in the abstract syntax tree 724 /// by semantic analysis for function calls, object constructions, etc. in 725 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 726 /// this routine also looks through any implicit casts to determine whether 727 /// the expression is a default argument. 728 bool isDefaultArgument() const; 729 730 /// \brief Determine whether the result of this expression is a 731 /// temporary object of the given class type. 732 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 733 734 /// \brief Whether this expression is an implicit reference to 'this' in C++. 735 bool isImplicitCXXThis() const; 736 737 const Expr *IgnoreImpCasts() const LLVM_READONLY { 738 return const_cast<Expr*>(this)->IgnoreImpCasts(); 739 } 740 const Expr *IgnoreParens() const LLVM_READONLY { 741 return const_cast<Expr*>(this)->IgnoreParens(); 742 } 743 const Expr *IgnoreParenCasts() const LLVM_READONLY { 744 return const_cast<Expr*>(this)->IgnoreParenCasts(); 745 } 746 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const LLVM_READONLY { 747 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 748 } 749 750 static bool hasAnyTypeDependentArguments(ArrayRef<Expr *> Exprs); 751 752 /// \brief For an expression of class type or pointer to class type, 753 /// return the most derived class decl the expression is known to refer to. 754 /// 755 /// If this expression is a cast, this method looks through it to find the 756 /// most derived decl that can be inferred from the expression. 757 /// This is valid because derived-to-base conversions have undefined 758 /// behavior if the object isn't dynamically of the derived type. 759 const CXXRecordDecl *getBestDynamicClassType() const; 760 761 /// Walk outwards from an expression we want to bind a reference to and 762 /// find the expression whose lifetime needs to be extended. Record 763 /// the adjustments needed along the path. 764 const Expr * 765 skipRValueSubobjectAdjustments( 766 SmallVectorImpl<SubobjectAdjustment> &Adjustments) const; 767 768 /// Skip irrelevant expressions to find what should be materialize for 769 /// binding with a reference. 770 const Expr * 771 findMaterializedTemporary(const MaterializeTemporaryExpr *&MTE) const; 772 773 static bool classof(const Stmt *T) { 774 return T->getStmtClass() >= firstExprConstant && 775 T->getStmtClass() <= lastExprConstant; 776 } 777}; 778 779 780//===----------------------------------------------------------------------===// 781// Primary Expressions. 782//===----------------------------------------------------------------------===// 783 784/// OpaqueValueExpr - An expression referring to an opaque object of a 785/// fixed type and value class. These don't correspond to concrete 786/// syntax; instead they're used to express operations (usually copy 787/// operations) on values whose source is generally obvious from 788/// context. 789class OpaqueValueExpr : public Expr { 790 friend class ASTStmtReader; 791 Expr *SourceExpr; 792 SourceLocation Loc; 793 794public: 795 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 796 ExprObjectKind OK = OK_Ordinary, 797 Expr *SourceExpr = 0) 798 : Expr(OpaqueValueExprClass, T, VK, OK, 799 T->isDependentType(), 800 T->isDependentType() || 801 (SourceExpr && SourceExpr->isValueDependent()), 802 T->isInstantiationDependentType(), 803 false), 804 SourceExpr(SourceExpr), Loc(Loc) { 805 } 806 807 /// Given an expression which invokes a copy constructor --- i.e. a 808 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 809 /// find the OpaqueValueExpr that's the source of the construction. 810 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 811 812 explicit OpaqueValueExpr(EmptyShell Empty) 813 : Expr(OpaqueValueExprClass, Empty) { } 814 815 /// \brief Retrieve the location of this expression. 816 SourceLocation getLocation() const { return Loc; } 817 818 SourceLocation getLocStart() const LLVM_READONLY { 819 return SourceExpr ? SourceExpr->getLocStart() : Loc; 820 } 821 SourceLocation getLocEnd() const LLVM_READONLY { 822 return SourceExpr ? SourceExpr->getLocEnd() : Loc; 823 } 824 SourceLocation getExprLoc() const LLVM_READONLY { 825 if (SourceExpr) return SourceExpr->getExprLoc(); 826 return Loc; 827 } 828 829 child_range children() { return child_range(); } 830 831 /// The source expression of an opaque value expression is the 832 /// expression which originally generated the value. This is 833 /// provided as a convenience for analyses that don't wish to 834 /// precisely model the execution behavior of the program. 835 /// 836 /// The source expression is typically set when building the 837 /// expression which binds the opaque value expression in the first 838 /// place. 839 Expr *getSourceExpr() const { return SourceExpr; } 840 841 static bool classof(const Stmt *T) { 842 return T->getStmtClass() == OpaqueValueExprClass; 843 } 844}; 845 846/// \brief A reference to a declared variable, function, enum, etc. 847/// [C99 6.5.1p2] 848/// 849/// This encodes all the information about how a declaration is referenced 850/// within an expression. 851/// 852/// There are several optional constructs attached to DeclRefExprs only when 853/// they apply in order to conserve memory. These are laid out past the end of 854/// the object, and flags in the DeclRefExprBitfield track whether they exist: 855/// 856/// DeclRefExprBits.HasQualifier: 857/// Specifies when this declaration reference expression has a C++ 858/// nested-name-specifier. 859/// DeclRefExprBits.HasFoundDecl: 860/// Specifies when this declaration reference expression has a record of 861/// a NamedDecl (different from the referenced ValueDecl) which was found 862/// during name lookup and/or overload resolution. 863/// DeclRefExprBits.HasTemplateKWAndArgsInfo: 864/// Specifies when this declaration reference expression has an explicit 865/// C++ template keyword and/or template argument list. 866/// DeclRefExprBits.RefersToEnclosingLocal 867/// Specifies when this declaration reference expression (validly) 868/// refers to a local variable from a different function. 869class DeclRefExpr : public Expr { 870 /// \brief The declaration that we are referencing. 871 ValueDecl *D; 872 873 /// \brief The location of the declaration name itself. 874 SourceLocation Loc; 875 876 /// \brief Provides source/type location info for the declaration name 877 /// embedded in D. 878 DeclarationNameLoc DNLoc; 879 880 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 881 NestedNameSpecifierLoc &getInternalQualifierLoc() { 882 assert(hasQualifier()); 883 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 884 } 885 886 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 887 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 888 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 889 } 890 891 /// \brief Test whether there is a distinct FoundDecl attached to the end of 892 /// this DRE. 893 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 894 895 /// \brief Helper to retrieve the optional NamedDecl through which this 896 /// reference occured. 897 NamedDecl *&getInternalFoundDecl() { 898 assert(hasFoundDecl()); 899 if (hasQualifier()) 900 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 901 return *reinterpret_cast<NamedDecl **>(this + 1); 902 } 903 904 /// \brief Helper to retrieve the optional NamedDecl through which this 905 /// reference occured. 906 NamedDecl *getInternalFoundDecl() const { 907 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 908 } 909 910 DeclRefExpr(ASTContext &Ctx, 911 NestedNameSpecifierLoc QualifierLoc, 912 SourceLocation TemplateKWLoc, 913 ValueDecl *D, bool refersToEnclosingLocal, 914 const DeclarationNameInfo &NameInfo, 915 NamedDecl *FoundD, 916 const TemplateArgumentListInfo *TemplateArgs, 917 QualType T, ExprValueKind VK); 918 919 /// \brief Construct an empty declaration reference expression. 920 explicit DeclRefExpr(EmptyShell Empty) 921 : Expr(DeclRefExprClass, Empty) { } 922 923 /// \brief Computes the type- and value-dependence flags for this 924 /// declaration reference expression. 925 void computeDependence(ASTContext &C); 926 927public: 928 DeclRefExpr(ValueDecl *D, bool refersToEnclosingLocal, QualType T, 929 ExprValueKind VK, SourceLocation L, 930 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 931 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 932 D(D), Loc(L), DNLoc(LocInfo) { 933 DeclRefExprBits.HasQualifier = 0; 934 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 935 DeclRefExprBits.HasFoundDecl = 0; 936 DeclRefExprBits.HadMultipleCandidates = 0; 937 DeclRefExprBits.RefersToEnclosingLocal = refersToEnclosingLocal; 938 computeDependence(D->getASTContext()); 939 } 940 941 static DeclRefExpr *Create(ASTContext &Context, 942 NestedNameSpecifierLoc QualifierLoc, 943 SourceLocation TemplateKWLoc, 944 ValueDecl *D, 945 bool isEnclosingLocal, 946 SourceLocation NameLoc, 947 QualType T, ExprValueKind VK, 948 NamedDecl *FoundD = 0, 949 const TemplateArgumentListInfo *TemplateArgs = 0); 950 951 static DeclRefExpr *Create(ASTContext &Context, 952 NestedNameSpecifierLoc QualifierLoc, 953 SourceLocation TemplateKWLoc, 954 ValueDecl *D, 955 bool isEnclosingLocal, 956 const DeclarationNameInfo &NameInfo, 957 QualType T, ExprValueKind VK, 958 NamedDecl *FoundD = 0, 959 const TemplateArgumentListInfo *TemplateArgs = 0); 960 961 /// \brief Construct an empty declaration reference expression. 962 static DeclRefExpr *CreateEmpty(ASTContext &Context, 963 bool HasQualifier, 964 bool HasFoundDecl, 965 bool HasTemplateKWAndArgsInfo, 966 unsigned NumTemplateArgs); 967 968 ValueDecl *getDecl() { return D; } 969 const ValueDecl *getDecl() const { return D; } 970 void setDecl(ValueDecl *NewD) { D = NewD; } 971 972 DeclarationNameInfo getNameInfo() const { 973 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 974 } 975 976 SourceLocation getLocation() const { return Loc; } 977 void setLocation(SourceLocation L) { Loc = L; } 978 SourceLocation getLocStart() const LLVM_READONLY; 979 SourceLocation getLocEnd() const LLVM_READONLY; 980 981 /// \brief Determine whether this declaration reference was preceded by a 982 /// C++ nested-name-specifier, e.g., \c N::foo. 983 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 984 985 /// \brief If the name was qualified, retrieves the nested-name-specifier 986 /// that precedes the name. Otherwise, returns NULL. 987 NestedNameSpecifier *getQualifier() const { 988 if (!hasQualifier()) 989 return 0; 990 991 return getInternalQualifierLoc().getNestedNameSpecifier(); 992 } 993 994 /// \brief If the name was qualified, retrieves the nested-name-specifier 995 /// that precedes the name, with source-location information. 996 NestedNameSpecifierLoc getQualifierLoc() const { 997 if (!hasQualifier()) 998 return NestedNameSpecifierLoc(); 999 1000 return getInternalQualifierLoc(); 1001 } 1002 1003 /// \brief Get the NamedDecl through which this reference occured. 1004 /// 1005 /// This Decl may be different from the ValueDecl actually referred to in the 1006 /// presence of using declarations, etc. It always returns non-NULL, and may 1007 /// simple return the ValueDecl when appropriate. 1008 NamedDecl *getFoundDecl() { 1009 return hasFoundDecl() ? getInternalFoundDecl() : D; 1010 } 1011 1012 /// \brief Get the NamedDecl through which this reference occurred. 1013 /// See non-const variant. 1014 const NamedDecl *getFoundDecl() const { 1015 return hasFoundDecl() ? getInternalFoundDecl() : D; 1016 } 1017 1018 bool hasTemplateKWAndArgsInfo() const { 1019 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 1020 } 1021 1022 /// \brief Return the optional template keyword and arguments info. 1023 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 1024 if (!hasTemplateKWAndArgsInfo()) 1025 return 0; 1026 1027 if (hasFoundDecl()) 1028 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 1029 &getInternalFoundDecl() + 1); 1030 1031 if (hasQualifier()) 1032 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 1033 &getInternalQualifierLoc() + 1); 1034 1035 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 1036 } 1037 1038 /// \brief Return the optional template keyword and arguments info. 1039 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 1040 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo(); 1041 } 1042 1043 /// \brief Retrieve the location of the template keyword preceding 1044 /// this name, if any. 1045 SourceLocation getTemplateKeywordLoc() const { 1046 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1047 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 1048 } 1049 1050 /// \brief Retrieve the location of the left angle bracket starting the 1051 /// explicit template argument list following the name, if any. 1052 SourceLocation getLAngleLoc() const { 1053 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1054 return getTemplateKWAndArgsInfo()->LAngleLoc; 1055 } 1056 1057 /// \brief Retrieve the location of the right angle bracket ending the 1058 /// explicit template argument list following the name, if any. 1059 SourceLocation getRAngleLoc() const { 1060 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1061 return getTemplateKWAndArgsInfo()->RAngleLoc; 1062 } 1063 1064 /// \brief Determines whether the name in this declaration reference 1065 /// was preceded by the template keyword. 1066 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 1067 1068 /// \brief Determines whether this declaration reference was followed by an 1069 /// explicit template argument list. 1070 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 1071 1072 /// \brief Retrieve the explicit template argument list that followed the 1073 /// member template name. 1074 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 1075 assert(hasExplicitTemplateArgs()); 1076 return *getTemplateKWAndArgsInfo(); 1077 } 1078 1079 /// \brief Retrieve the explicit template argument list that followed the 1080 /// member template name. 1081 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 1082 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 1083 } 1084 1085 /// \brief Retrieves the optional explicit template arguments. 1086 /// This points to the same data as getExplicitTemplateArgs(), but 1087 /// returns null if there are no explicit template arguments. 1088 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 1089 if (!hasExplicitTemplateArgs()) return 0; 1090 return &getExplicitTemplateArgs(); 1091 } 1092 1093 /// \brief Copies the template arguments (if present) into the given 1094 /// structure. 1095 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1096 if (hasExplicitTemplateArgs()) 1097 getExplicitTemplateArgs().copyInto(List); 1098 } 1099 1100 /// \brief Retrieve the template arguments provided as part of this 1101 /// template-id. 1102 const TemplateArgumentLoc *getTemplateArgs() const { 1103 if (!hasExplicitTemplateArgs()) 1104 return 0; 1105 1106 return getExplicitTemplateArgs().getTemplateArgs(); 1107 } 1108 1109 /// \brief Retrieve the number of template arguments provided as part of this 1110 /// template-id. 1111 unsigned getNumTemplateArgs() const { 1112 if (!hasExplicitTemplateArgs()) 1113 return 0; 1114 1115 return getExplicitTemplateArgs().NumTemplateArgs; 1116 } 1117 1118 /// \brief Returns true if this expression refers to a function that 1119 /// was resolved from an overloaded set having size greater than 1. 1120 bool hadMultipleCandidates() const { 1121 return DeclRefExprBits.HadMultipleCandidates; 1122 } 1123 /// \brief Sets the flag telling whether this expression refers to 1124 /// a function that was resolved from an overloaded set having size 1125 /// greater than 1. 1126 void setHadMultipleCandidates(bool V = true) { 1127 DeclRefExprBits.HadMultipleCandidates = V; 1128 } 1129 1130 /// Does this DeclRefExpr refer to a local declaration from an 1131 /// enclosing function scope? 1132 bool refersToEnclosingLocal() const { 1133 return DeclRefExprBits.RefersToEnclosingLocal; 1134 } 1135 1136 static bool classof(const Stmt *T) { 1137 return T->getStmtClass() == DeclRefExprClass; 1138 } 1139 1140 // Iterators 1141 child_range children() { return child_range(); } 1142 1143 friend class ASTStmtReader; 1144 friend class ASTStmtWriter; 1145}; 1146 1147/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 1148class PredefinedExpr : public Expr { 1149public: 1150 enum IdentType { 1151 Func, 1152 Function, 1153 LFunction, // Same as Function, but as wide string. 1154 PrettyFunction, 1155 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 1156 /// 'virtual' keyword is omitted for virtual member functions. 1157 PrettyFunctionNoVirtual 1158 }; 1159 1160private: 1161 SourceLocation Loc; 1162 IdentType Type; 1163public: 1164 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 1165 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 1166 type->isDependentType(), type->isDependentType(), 1167 type->isInstantiationDependentType(), 1168 /*ContainsUnexpandedParameterPack=*/false), 1169 Loc(l), Type(IT) {} 1170 1171 /// \brief Construct an empty predefined expression. 1172 explicit PredefinedExpr(EmptyShell Empty) 1173 : Expr(PredefinedExprClass, Empty) { } 1174 1175 IdentType getIdentType() const { return Type; } 1176 void setIdentType(IdentType IT) { Type = IT; } 1177 1178 SourceLocation getLocation() const { return Loc; } 1179 void setLocation(SourceLocation L) { Loc = L; } 1180 1181 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1182 1183 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1184 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1185 1186 static bool classof(const Stmt *T) { 1187 return T->getStmtClass() == PredefinedExprClass; 1188 } 1189 1190 // Iterators 1191 child_range children() { return child_range(); } 1192}; 1193 1194/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1195/// leaking memory. 1196/// 1197/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1198/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1199/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1200/// the APFloat/APInt values will never get freed. APNumericStorage uses 1201/// ASTContext's allocator for memory allocation. 1202class APNumericStorage { 1203 union { 1204 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1205 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1206 }; 1207 unsigned BitWidth; 1208 1209 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1210 1211 APNumericStorage(const APNumericStorage &) LLVM_DELETED_FUNCTION; 1212 void operator=(const APNumericStorage &) LLVM_DELETED_FUNCTION; 1213 1214protected: 1215 APNumericStorage() : VAL(0), BitWidth(0) { } 1216 1217 llvm::APInt getIntValue() const { 1218 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1219 if (NumWords > 1) 1220 return llvm::APInt(BitWidth, NumWords, pVal); 1221 else 1222 return llvm::APInt(BitWidth, VAL); 1223 } 1224 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1225}; 1226 1227class APIntStorage : private APNumericStorage { 1228public: 1229 llvm::APInt getValue() const { return getIntValue(); } 1230 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1231}; 1232 1233class APFloatStorage : private APNumericStorage { 1234public: 1235 llvm::APFloat getValue(const llvm::fltSemantics &Semantics) const { 1236 return llvm::APFloat(Semantics, getIntValue()); 1237 } 1238 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1239 setIntValue(C, Val.bitcastToAPInt()); 1240 } 1241}; 1242 1243class IntegerLiteral : public Expr, public APIntStorage { 1244 SourceLocation Loc; 1245 1246 /// \brief Construct an empty integer literal. 1247 explicit IntegerLiteral(EmptyShell Empty) 1248 : Expr(IntegerLiteralClass, Empty) { } 1249 1250public: 1251 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1252 // or UnsignedLongLongTy 1253 IntegerLiteral(ASTContext &C, const llvm::APInt &V, QualType type, 1254 SourceLocation l); 1255 1256 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1257 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1258 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1259 /// \param V - the value that the returned integer literal contains. 1260 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1261 QualType type, SourceLocation l); 1262 /// \brief Returns a new empty integer literal. 1263 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1264 1265 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1266 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1267 1268 /// \brief Retrieve the location of the literal. 1269 SourceLocation getLocation() const { return Loc; } 1270 1271 void setLocation(SourceLocation Location) { Loc = Location; } 1272 1273 static bool classof(const Stmt *T) { 1274 return T->getStmtClass() == IntegerLiteralClass; 1275 } 1276 1277 // Iterators 1278 child_range children() { return child_range(); } 1279}; 1280 1281class CharacterLiteral : public Expr { 1282public: 1283 enum CharacterKind { 1284 Ascii, 1285 Wide, 1286 UTF16, 1287 UTF32 1288 }; 1289 1290private: 1291 unsigned Value; 1292 SourceLocation Loc; 1293public: 1294 // type should be IntTy 1295 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1296 SourceLocation l) 1297 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1298 false, false), 1299 Value(value), Loc(l) { 1300 CharacterLiteralBits.Kind = kind; 1301 } 1302 1303 /// \brief Construct an empty character literal. 1304 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1305 1306 SourceLocation getLocation() const { return Loc; } 1307 CharacterKind getKind() const { 1308 return static_cast<CharacterKind>(CharacterLiteralBits.Kind); 1309 } 1310 1311 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1312 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1313 1314 unsigned getValue() const { return Value; } 1315 1316 void setLocation(SourceLocation Location) { Loc = Location; } 1317 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; } 1318 void setValue(unsigned Val) { Value = Val; } 1319 1320 static bool classof(const Stmt *T) { 1321 return T->getStmtClass() == CharacterLiteralClass; 1322 } 1323 1324 // Iterators 1325 child_range children() { return child_range(); } 1326}; 1327 1328class FloatingLiteral : public Expr, private APFloatStorage { 1329 SourceLocation Loc; 1330 1331 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1332 QualType Type, SourceLocation L); 1333 1334 /// \brief Construct an empty floating-point literal. 1335 explicit FloatingLiteral(ASTContext &C, EmptyShell Empty); 1336 1337public: 1338 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1339 bool isexact, QualType Type, SourceLocation L); 1340 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1341 1342 llvm::APFloat getValue() const { 1343 return APFloatStorage::getValue(getSemantics()); 1344 } 1345 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1346 assert(&getSemantics() == &Val.getSemantics() && "Inconsistent semantics"); 1347 APFloatStorage::setValue(C, Val); 1348 } 1349 1350 /// Get a raw enumeration value representing the floating-point semantics of 1351 /// this literal (32-bit IEEE, x87, ...), suitable for serialisation. 1352 APFloatSemantics getRawSemantics() const { 1353 return static_cast<APFloatSemantics>(FloatingLiteralBits.Semantics); 1354 } 1355 1356 /// Set the raw enumeration value representing the floating-point semantics of 1357 /// this literal (32-bit IEEE, x87, ...), suitable for serialisation. 1358 void setRawSemantics(APFloatSemantics Sem) { 1359 FloatingLiteralBits.Semantics = Sem; 1360 } 1361 1362 /// Return the APFloat semantics this literal uses. 1363 const llvm::fltSemantics &getSemantics() const; 1364 1365 /// Set the APFloat semantics this literal uses. 1366 void setSemantics(const llvm::fltSemantics &Sem); 1367 1368 bool isExact() const { return FloatingLiteralBits.IsExact; } 1369 void setExact(bool E) { FloatingLiteralBits.IsExact = E; } 1370 1371 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1372 /// double. Note that this may cause loss of precision, but is useful for 1373 /// debugging dumps, etc. 1374 double getValueAsApproximateDouble() const; 1375 1376 SourceLocation getLocation() const { return Loc; } 1377 void setLocation(SourceLocation L) { Loc = L; } 1378 1379 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1380 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1381 1382 static bool classof(const Stmt *T) { 1383 return T->getStmtClass() == FloatingLiteralClass; 1384 } 1385 1386 // Iterators 1387 child_range children() { return child_range(); } 1388}; 1389 1390/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1391/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1392/// IntegerLiteral classes. Instances of this class always have a Complex type 1393/// whose element type matches the subexpression. 1394/// 1395class ImaginaryLiteral : public Expr { 1396 Stmt *Val; 1397public: 1398 ImaginaryLiteral(Expr *val, QualType Ty) 1399 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1400 false, false), 1401 Val(val) {} 1402 1403 /// \brief Build an empty imaginary literal. 1404 explicit ImaginaryLiteral(EmptyShell Empty) 1405 : Expr(ImaginaryLiteralClass, Empty) { } 1406 1407 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1408 Expr *getSubExpr() { return cast<Expr>(Val); } 1409 void setSubExpr(Expr *E) { Val = E; } 1410 1411 SourceLocation getLocStart() const LLVM_READONLY { return Val->getLocStart(); } 1412 SourceLocation getLocEnd() const LLVM_READONLY { return Val->getLocEnd(); } 1413 1414 static bool classof(const Stmt *T) { 1415 return T->getStmtClass() == ImaginaryLiteralClass; 1416 } 1417 1418 // Iterators 1419 child_range children() { return child_range(&Val, &Val+1); } 1420}; 1421 1422/// StringLiteral - This represents a string literal expression, e.g. "foo" 1423/// or L"bar" (wide strings). The actual string is returned by getStrData() 1424/// is NOT null-terminated, and the length of the string is determined by 1425/// calling getByteLength(). The C type for a string is always a 1426/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1427/// not. 1428/// 1429/// Note that strings in C can be formed by concatenation of multiple string 1430/// literal pptokens in translation phase #6. This keeps track of the locations 1431/// of each of these pieces. 1432/// 1433/// Strings in C can also be truncated and extended by assigning into arrays, 1434/// e.g. with constructs like: 1435/// char X[2] = "foobar"; 1436/// In this case, getByteLength() will return 6, but the string literal will 1437/// have type "char[2]". 1438class StringLiteral : public Expr { 1439public: 1440 enum StringKind { 1441 Ascii, 1442 Wide, 1443 UTF8, 1444 UTF16, 1445 UTF32 1446 }; 1447 1448private: 1449 friend class ASTStmtReader; 1450 1451 union { 1452 const char *asChar; 1453 const uint16_t *asUInt16; 1454 const uint32_t *asUInt32; 1455 } StrData; 1456 unsigned Length; 1457 unsigned CharByteWidth : 4; 1458 unsigned Kind : 3; 1459 unsigned IsPascal : 1; 1460 unsigned NumConcatenated; 1461 SourceLocation TokLocs[1]; 1462 1463 StringLiteral(QualType Ty) : 1464 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1465 false) {} 1466 1467 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1468 1469public: 1470 /// This is the "fully general" constructor that allows representation of 1471 /// strings formed from multiple concatenated tokens. 1472 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1473 bool Pascal, QualType Ty, 1474 const SourceLocation *Loc, unsigned NumStrs); 1475 1476 /// Simple constructor for string literals made from one token. 1477 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1478 bool Pascal, QualType Ty, 1479 SourceLocation Loc) { 1480 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1481 } 1482 1483 /// \brief Construct an empty string literal. 1484 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1485 1486 StringRef getString() const { 1487 assert(CharByteWidth==1 1488 && "This function is used in places that assume strings use char"); 1489 return StringRef(StrData.asChar, getByteLength()); 1490 } 1491 1492 /// Allow access to clients that need the byte representation, such as 1493 /// ASTWriterStmt::VisitStringLiteral(). 1494 StringRef getBytes() const { 1495 // FIXME: StringRef may not be the right type to use as a result for this. 1496 if (CharByteWidth == 1) 1497 return StringRef(StrData.asChar, getByteLength()); 1498 if (CharByteWidth == 4) 1499 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1500 getByteLength()); 1501 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1502 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1503 getByteLength()); 1504 } 1505 1506 void outputString(raw_ostream &OS) const; 1507 1508 uint32_t getCodeUnit(size_t i) const { 1509 assert(i < Length && "out of bounds access"); 1510 if (CharByteWidth == 1) 1511 return static_cast<unsigned char>(StrData.asChar[i]); 1512 if (CharByteWidth == 4) 1513 return StrData.asUInt32[i]; 1514 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1515 return StrData.asUInt16[i]; 1516 } 1517 1518 unsigned getByteLength() const { return CharByteWidth*Length; } 1519 unsigned getLength() const { return Length; } 1520 unsigned getCharByteWidth() const { return CharByteWidth; } 1521 1522 /// \brief Sets the string data to the given string data. 1523 void setString(ASTContext &C, StringRef Str, 1524 StringKind Kind, bool IsPascal); 1525 1526 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1527 1528 1529 bool isAscii() const { return Kind == Ascii; } 1530 bool isWide() const { return Kind == Wide; } 1531 bool isUTF8() const { return Kind == UTF8; } 1532 bool isUTF16() const { return Kind == UTF16; } 1533 bool isUTF32() const { return Kind == UTF32; } 1534 bool isPascal() const { return IsPascal; } 1535 1536 bool containsNonAsciiOrNull() const { 1537 StringRef Str = getString(); 1538 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1539 if (!isASCII(Str[i]) || !Str[i]) 1540 return true; 1541 return false; 1542 } 1543 1544 /// getNumConcatenated - Get the number of string literal tokens that were 1545 /// concatenated in translation phase #6 to form this string literal. 1546 unsigned getNumConcatenated() const { return NumConcatenated; } 1547 1548 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1549 assert(TokNum < NumConcatenated && "Invalid tok number"); 1550 return TokLocs[TokNum]; 1551 } 1552 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1553 assert(TokNum < NumConcatenated && "Invalid tok number"); 1554 TokLocs[TokNum] = L; 1555 } 1556 1557 /// getLocationOfByte - Return a source location that points to the specified 1558 /// byte of this string literal. 1559 /// 1560 /// Strings are amazingly complex. They can be formed from multiple tokens 1561 /// and can have escape sequences in them in addition to the usual trigraph 1562 /// and escaped newline business. This routine handles this complexity. 1563 /// 1564 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1565 const LangOptions &Features, 1566 const TargetInfo &Target) const; 1567 1568 typedef const SourceLocation *tokloc_iterator; 1569 tokloc_iterator tokloc_begin() const { return TokLocs; } 1570 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1571 1572 SourceLocation getLocStart() const LLVM_READONLY { return TokLocs[0]; } 1573 SourceLocation getLocEnd() const LLVM_READONLY { 1574 return TokLocs[NumConcatenated - 1]; 1575 } 1576 1577 static bool classof(const Stmt *T) { 1578 return T->getStmtClass() == StringLiteralClass; 1579 } 1580 1581 // Iterators 1582 child_range children() { return child_range(); } 1583}; 1584 1585/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1586/// AST node is only formed if full location information is requested. 1587class ParenExpr : public Expr { 1588 SourceLocation L, R; 1589 Stmt *Val; 1590public: 1591 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1592 : Expr(ParenExprClass, val->getType(), 1593 val->getValueKind(), val->getObjectKind(), 1594 val->isTypeDependent(), val->isValueDependent(), 1595 val->isInstantiationDependent(), 1596 val->containsUnexpandedParameterPack()), 1597 L(l), R(r), Val(val) {} 1598 1599 /// \brief Construct an empty parenthesized expression. 1600 explicit ParenExpr(EmptyShell Empty) 1601 : Expr(ParenExprClass, Empty) { } 1602 1603 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1604 Expr *getSubExpr() { return cast<Expr>(Val); } 1605 void setSubExpr(Expr *E) { Val = E; } 1606 1607 SourceLocation getLocStart() const LLVM_READONLY { return L; } 1608 SourceLocation getLocEnd() const LLVM_READONLY { return R; } 1609 1610 /// \brief Get the location of the left parentheses '('. 1611 SourceLocation getLParen() const { return L; } 1612 void setLParen(SourceLocation Loc) { L = Loc; } 1613 1614 /// \brief Get the location of the right parentheses ')'. 1615 SourceLocation getRParen() const { return R; } 1616 void setRParen(SourceLocation Loc) { R = Loc; } 1617 1618 static bool classof(const Stmt *T) { 1619 return T->getStmtClass() == ParenExprClass; 1620 } 1621 1622 // Iterators 1623 child_range children() { return child_range(&Val, &Val+1); } 1624}; 1625 1626 1627/// UnaryOperator - This represents the unary-expression's (except sizeof and 1628/// alignof), the postinc/postdec operators from postfix-expression, and various 1629/// extensions. 1630/// 1631/// Notes on various nodes: 1632/// 1633/// Real/Imag - These return the real/imag part of a complex operand. If 1634/// applied to a non-complex value, the former returns its operand and the 1635/// later returns zero in the type of the operand. 1636/// 1637class UnaryOperator : public Expr { 1638public: 1639 typedef UnaryOperatorKind Opcode; 1640 1641private: 1642 unsigned Opc : 5; 1643 SourceLocation Loc; 1644 Stmt *Val; 1645public: 1646 1647 UnaryOperator(Expr *input, Opcode opc, QualType type, 1648 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1649 : Expr(UnaryOperatorClass, type, VK, OK, 1650 input->isTypeDependent() || type->isDependentType(), 1651 input->isValueDependent(), 1652 (input->isInstantiationDependent() || 1653 type->isInstantiationDependentType()), 1654 input->containsUnexpandedParameterPack()), 1655 Opc(opc), Loc(l), Val(input) {} 1656 1657 /// \brief Build an empty unary operator. 1658 explicit UnaryOperator(EmptyShell Empty) 1659 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1660 1661 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1662 void setOpcode(Opcode O) { Opc = O; } 1663 1664 Expr *getSubExpr() const { return cast<Expr>(Val); } 1665 void setSubExpr(Expr *E) { Val = E; } 1666 1667 /// getOperatorLoc - Return the location of the operator. 1668 SourceLocation getOperatorLoc() const { return Loc; } 1669 void setOperatorLoc(SourceLocation L) { Loc = L; } 1670 1671 /// isPostfix - Return true if this is a postfix operation, like x++. 1672 static bool isPostfix(Opcode Op) { 1673 return Op == UO_PostInc || Op == UO_PostDec; 1674 } 1675 1676 /// isPrefix - Return true if this is a prefix operation, like --x. 1677 static bool isPrefix(Opcode Op) { 1678 return Op == UO_PreInc || Op == UO_PreDec; 1679 } 1680 1681 bool isPrefix() const { return isPrefix(getOpcode()); } 1682 bool isPostfix() const { return isPostfix(getOpcode()); } 1683 1684 static bool isIncrementOp(Opcode Op) { 1685 return Op == UO_PreInc || Op == UO_PostInc; 1686 } 1687 bool isIncrementOp() const { 1688 return isIncrementOp(getOpcode()); 1689 } 1690 1691 static bool isDecrementOp(Opcode Op) { 1692 return Op == UO_PreDec || Op == UO_PostDec; 1693 } 1694 bool isDecrementOp() const { 1695 return isDecrementOp(getOpcode()); 1696 } 1697 1698 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1699 bool isIncrementDecrementOp() const { 1700 return isIncrementDecrementOp(getOpcode()); 1701 } 1702 1703 static bool isArithmeticOp(Opcode Op) { 1704 return Op >= UO_Plus && Op <= UO_LNot; 1705 } 1706 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1707 1708 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1709 /// corresponds to, e.g. "sizeof" or "[pre]++" 1710 static StringRef getOpcodeStr(Opcode Op); 1711 1712 /// \brief Retrieve the unary opcode that corresponds to the given 1713 /// overloaded operator. 1714 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1715 1716 /// \brief Retrieve the overloaded operator kind that corresponds to 1717 /// the given unary opcode. 1718 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1719 1720 SourceLocation getLocStart() const LLVM_READONLY { 1721 return isPostfix() ? Val->getLocStart() : Loc; 1722 } 1723 SourceLocation getLocEnd() const LLVM_READONLY { 1724 return isPostfix() ? Loc : Val->getLocEnd(); 1725 } 1726 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; } 1727 1728 static bool classof(const Stmt *T) { 1729 return T->getStmtClass() == UnaryOperatorClass; 1730 } 1731 1732 // Iterators 1733 child_range children() { return child_range(&Val, &Val+1); } 1734}; 1735 1736/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1737/// offsetof(record-type, member-designator). For example, given: 1738/// @code 1739/// struct S { 1740/// float f; 1741/// double d; 1742/// }; 1743/// struct T { 1744/// int i; 1745/// struct S s[10]; 1746/// }; 1747/// @endcode 1748/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1749 1750class OffsetOfExpr : public Expr { 1751public: 1752 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1753 class OffsetOfNode { 1754 public: 1755 /// \brief The kind of offsetof node we have. 1756 enum Kind { 1757 /// \brief An index into an array. 1758 Array = 0x00, 1759 /// \brief A field. 1760 Field = 0x01, 1761 /// \brief A field in a dependent type, known only by its name. 1762 Identifier = 0x02, 1763 /// \brief An implicit indirection through a C++ base class, when the 1764 /// field found is in a base class. 1765 Base = 0x03 1766 }; 1767 1768 private: 1769 enum { MaskBits = 2, Mask = 0x03 }; 1770 1771 /// \brief The source range that covers this part of the designator. 1772 SourceRange Range; 1773 1774 /// \brief The data describing the designator, which comes in three 1775 /// different forms, depending on the lower two bits. 1776 /// - An unsigned index into the array of Expr*'s stored after this node 1777 /// in memory, for [constant-expression] designators. 1778 /// - A FieldDecl*, for references to a known field. 1779 /// - An IdentifierInfo*, for references to a field with a given name 1780 /// when the class type is dependent. 1781 /// - A CXXBaseSpecifier*, for references that look at a field in a 1782 /// base class. 1783 uintptr_t Data; 1784 1785 public: 1786 /// \brief Create an offsetof node that refers to an array element. 1787 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1788 SourceLocation RBracketLoc) 1789 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1790 1791 /// \brief Create an offsetof node that refers to a field. 1792 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1793 SourceLocation NameLoc) 1794 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1795 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1796 1797 /// \brief Create an offsetof node that refers to an identifier. 1798 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1799 SourceLocation NameLoc) 1800 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1801 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1802 1803 /// \brief Create an offsetof node that refers into a C++ base class. 1804 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1805 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1806 1807 /// \brief Determine what kind of offsetof node this is. 1808 Kind getKind() const { 1809 return static_cast<Kind>(Data & Mask); 1810 } 1811 1812 /// \brief For an array element node, returns the index into the array 1813 /// of expressions. 1814 unsigned getArrayExprIndex() const { 1815 assert(getKind() == Array); 1816 return Data >> 2; 1817 } 1818 1819 /// \brief For a field offsetof node, returns the field. 1820 FieldDecl *getField() const { 1821 assert(getKind() == Field); 1822 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1823 } 1824 1825 /// \brief For a field or identifier offsetof node, returns the name of 1826 /// the field. 1827 IdentifierInfo *getFieldName() const; 1828 1829 /// \brief For a base class node, returns the base specifier. 1830 CXXBaseSpecifier *getBase() const { 1831 assert(getKind() == Base); 1832 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1833 } 1834 1835 /// \brief Retrieve the source range that covers this offsetof node. 1836 /// 1837 /// For an array element node, the source range contains the locations of 1838 /// the square brackets. For a field or identifier node, the source range 1839 /// contains the location of the period (if there is one) and the 1840 /// identifier. 1841 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 1842 SourceLocation getLocStart() const LLVM_READONLY { return Range.getBegin(); } 1843 SourceLocation getLocEnd() const LLVM_READONLY { return Range.getEnd(); } 1844 }; 1845 1846private: 1847 1848 SourceLocation OperatorLoc, RParenLoc; 1849 // Base type; 1850 TypeSourceInfo *TSInfo; 1851 // Number of sub-components (i.e. instances of OffsetOfNode). 1852 unsigned NumComps; 1853 // Number of sub-expressions (i.e. array subscript expressions). 1854 unsigned NumExprs; 1855 1856 OffsetOfExpr(ASTContext &C, QualType type, 1857 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1858 ArrayRef<OffsetOfNode> comps, ArrayRef<Expr*> exprs, 1859 SourceLocation RParenLoc); 1860 1861 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1862 : Expr(OffsetOfExprClass, EmptyShell()), 1863 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1864 1865public: 1866 1867 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1868 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1869 ArrayRef<OffsetOfNode> comps, 1870 ArrayRef<Expr*> exprs, SourceLocation RParenLoc); 1871 1872 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1873 unsigned NumComps, unsigned NumExprs); 1874 1875 /// getOperatorLoc - Return the location of the operator. 1876 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1877 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1878 1879 /// \brief Return the location of the right parentheses. 1880 SourceLocation getRParenLoc() const { return RParenLoc; } 1881 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1882 1883 TypeSourceInfo *getTypeSourceInfo() const { 1884 return TSInfo; 1885 } 1886 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1887 TSInfo = tsi; 1888 } 1889 1890 const OffsetOfNode &getComponent(unsigned Idx) const { 1891 assert(Idx < NumComps && "Subscript out of range"); 1892 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1893 } 1894 1895 void setComponent(unsigned Idx, OffsetOfNode ON) { 1896 assert(Idx < NumComps && "Subscript out of range"); 1897 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1898 } 1899 1900 unsigned getNumComponents() const { 1901 return NumComps; 1902 } 1903 1904 Expr* getIndexExpr(unsigned Idx) { 1905 assert(Idx < NumExprs && "Subscript out of range"); 1906 return reinterpret_cast<Expr **>( 1907 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1908 } 1909 const Expr *getIndexExpr(unsigned Idx) const { 1910 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1911 } 1912 1913 void setIndexExpr(unsigned Idx, Expr* E) { 1914 assert(Idx < NumComps && "Subscript out of range"); 1915 reinterpret_cast<Expr **>( 1916 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1917 } 1918 1919 unsigned getNumExpressions() const { 1920 return NumExprs; 1921 } 1922 1923 SourceLocation getLocStart() const LLVM_READONLY { return OperatorLoc; } 1924 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 1925 1926 static bool classof(const Stmt *T) { 1927 return T->getStmtClass() == OffsetOfExprClass; 1928 } 1929 1930 // Iterators 1931 child_range children() { 1932 Stmt **begin = 1933 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1934 + NumComps); 1935 return child_range(begin, begin + NumExprs); 1936 } 1937}; 1938 1939/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1940/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1941/// vec_step (OpenCL 1.1 6.11.12). 1942class UnaryExprOrTypeTraitExpr : public Expr { 1943 union { 1944 TypeSourceInfo *Ty; 1945 Stmt *Ex; 1946 } Argument; 1947 SourceLocation OpLoc, RParenLoc; 1948 1949public: 1950 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1951 QualType resultType, SourceLocation op, 1952 SourceLocation rp) : 1953 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1954 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1955 // Value-dependent if the argument is type-dependent. 1956 TInfo->getType()->isDependentType(), 1957 TInfo->getType()->isInstantiationDependentType(), 1958 TInfo->getType()->containsUnexpandedParameterPack()), 1959 OpLoc(op), RParenLoc(rp) { 1960 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1961 UnaryExprOrTypeTraitExprBits.IsType = true; 1962 Argument.Ty = TInfo; 1963 } 1964 1965 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1966 QualType resultType, SourceLocation op, 1967 SourceLocation rp) : 1968 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1969 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1970 // Value-dependent if the argument is type-dependent. 1971 E->isTypeDependent(), 1972 E->isInstantiationDependent(), 1973 E->containsUnexpandedParameterPack()), 1974 OpLoc(op), RParenLoc(rp) { 1975 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1976 UnaryExprOrTypeTraitExprBits.IsType = false; 1977 Argument.Ex = E; 1978 } 1979 1980 /// \brief Construct an empty sizeof/alignof expression. 1981 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1982 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1983 1984 UnaryExprOrTypeTrait getKind() const { 1985 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind); 1986 } 1987 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;} 1988 1989 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; } 1990 QualType getArgumentType() const { 1991 return getArgumentTypeInfo()->getType(); 1992 } 1993 TypeSourceInfo *getArgumentTypeInfo() const { 1994 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1995 return Argument.Ty; 1996 } 1997 Expr *getArgumentExpr() { 1998 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1999 return static_cast<Expr*>(Argument.Ex); 2000 } 2001 const Expr *getArgumentExpr() const { 2002 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 2003 } 2004 2005 void setArgument(Expr *E) { 2006 Argument.Ex = E; 2007 UnaryExprOrTypeTraitExprBits.IsType = false; 2008 } 2009 void setArgument(TypeSourceInfo *TInfo) { 2010 Argument.Ty = TInfo; 2011 UnaryExprOrTypeTraitExprBits.IsType = true; 2012 } 2013 2014 /// Gets the argument type, or the type of the argument expression, whichever 2015 /// is appropriate. 2016 QualType getTypeOfArgument() const { 2017 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 2018 } 2019 2020 SourceLocation getOperatorLoc() const { return OpLoc; } 2021 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2022 2023 SourceLocation getRParenLoc() const { return RParenLoc; } 2024 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2025 2026 SourceLocation getLocStart() const LLVM_READONLY { return OpLoc; } 2027 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 2028 2029 static bool classof(const Stmt *T) { 2030 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 2031 } 2032 2033 // Iterators 2034 child_range children(); 2035}; 2036 2037//===----------------------------------------------------------------------===// 2038// Postfix Operators. 2039//===----------------------------------------------------------------------===// 2040 2041/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 2042class ArraySubscriptExpr : public Expr { 2043 enum { LHS, RHS, END_EXPR=2 }; 2044 Stmt* SubExprs[END_EXPR]; 2045 SourceLocation RBracketLoc; 2046public: 2047 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 2048 ExprValueKind VK, ExprObjectKind OK, 2049 SourceLocation rbracketloc) 2050 : Expr(ArraySubscriptExprClass, t, VK, OK, 2051 lhs->isTypeDependent() || rhs->isTypeDependent(), 2052 lhs->isValueDependent() || rhs->isValueDependent(), 2053 (lhs->isInstantiationDependent() || 2054 rhs->isInstantiationDependent()), 2055 (lhs->containsUnexpandedParameterPack() || 2056 rhs->containsUnexpandedParameterPack())), 2057 RBracketLoc(rbracketloc) { 2058 SubExprs[LHS] = lhs; 2059 SubExprs[RHS] = rhs; 2060 } 2061 2062 /// \brief Create an empty array subscript expression. 2063 explicit ArraySubscriptExpr(EmptyShell Shell) 2064 : Expr(ArraySubscriptExprClass, Shell) { } 2065 2066 /// An array access can be written A[4] or 4[A] (both are equivalent). 2067 /// - getBase() and getIdx() always present the normalized view: A[4]. 2068 /// In this case getBase() returns "A" and getIdx() returns "4". 2069 /// - getLHS() and getRHS() present the syntactic view. e.g. for 2070 /// 4[A] getLHS() returns "4". 2071 /// Note: Because vector element access is also written A[4] we must 2072 /// predicate the format conversion in getBase and getIdx only on the 2073 /// the type of the RHS, as it is possible for the LHS to be a vector of 2074 /// integer type 2075 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 2076 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2077 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2078 2079 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 2080 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2081 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2082 2083 Expr *getBase() { 2084 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 2085 } 2086 2087 const Expr *getBase() const { 2088 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 2089 } 2090 2091 Expr *getIdx() { 2092 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2093 } 2094 2095 const Expr *getIdx() const { 2096 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2097 } 2098 2099 SourceLocation getLocStart() const LLVM_READONLY { 2100 return getLHS()->getLocStart(); 2101 } 2102 SourceLocation getLocEnd() const LLVM_READONLY { return RBracketLoc; } 2103 2104 SourceLocation getRBracketLoc() const { return RBracketLoc; } 2105 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 2106 2107 SourceLocation getExprLoc() const LLVM_READONLY { 2108 return getBase()->getExprLoc(); 2109 } 2110 2111 static bool classof(const Stmt *T) { 2112 return T->getStmtClass() == ArraySubscriptExprClass; 2113 } 2114 2115 // Iterators 2116 child_range children() { 2117 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2118 } 2119}; 2120 2121 2122/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 2123/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 2124/// while its subclasses may represent alternative syntax that (semantically) 2125/// results in a function call. For example, CXXOperatorCallExpr is 2126/// a subclass for overloaded operator calls that use operator syntax, e.g., 2127/// "str1 + str2" to resolve to a function call. 2128class CallExpr : public Expr { 2129 enum { FN=0, PREARGS_START=1 }; 2130 Stmt **SubExprs; 2131 unsigned NumArgs; 2132 SourceLocation RParenLoc; 2133 2134protected: 2135 // These versions of the constructor are for derived classes. 2136 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 2137 ArrayRef<Expr*> args, QualType t, ExprValueKind VK, 2138 SourceLocation rparenloc); 2139 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 2140 2141 Stmt *getPreArg(unsigned i) { 2142 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2143 return SubExprs[PREARGS_START+i]; 2144 } 2145 const Stmt *getPreArg(unsigned i) const { 2146 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2147 return SubExprs[PREARGS_START+i]; 2148 } 2149 void setPreArg(unsigned i, Stmt *PreArg) { 2150 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2151 SubExprs[PREARGS_START+i] = PreArg; 2152 } 2153 2154 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2155 2156public: 2157 CallExpr(ASTContext& C, Expr *fn, ArrayRef<Expr*> args, QualType t, 2158 ExprValueKind VK, SourceLocation rparenloc); 2159 2160 /// \brief Build an empty call expression. 2161 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 2162 2163 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2164 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2165 void setCallee(Expr *F) { SubExprs[FN] = F; } 2166 2167 Decl *getCalleeDecl(); 2168 const Decl *getCalleeDecl() const { 2169 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2170 } 2171 2172 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2173 FunctionDecl *getDirectCallee(); 2174 const FunctionDecl *getDirectCallee() const { 2175 return const_cast<CallExpr*>(this)->getDirectCallee(); 2176 } 2177 2178 /// getNumArgs - Return the number of actual arguments to this call. 2179 /// 2180 unsigned getNumArgs() const { return NumArgs; } 2181 2182 /// \brief Retrieve the call arguments. 2183 Expr **getArgs() { 2184 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2185 } 2186 const Expr *const *getArgs() const { 2187 return const_cast<CallExpr*>(this)->getArgs(); 2188 } 2189 2190 /// getArg - Return the specified argument. 2191 Expr *getArg(unsigned Arg) { 2192 assert(Arg < NumArgs && "Arg access out of range!"); 2193 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2194 } 2195 const Expr *getArg(unsigned Arg) const { 2196 assert(Arg < NumArgs && "Arg access out of range!"); 2197 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2198 } 2199 2200 /// setArg - Set the specified argument. 2201 void setArg(unsigned Arg, Expr *ArgExpr) { 2202 assert(Arg < NumArgs && "Arg access out of range!"); 2203 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2204 } 2205 2206 /// setNumArgs - This changes the number of arguments present in this call. 2207 /// Any orphaned expressions are deleted by this, and any new operands are set 2208 /// to null. 2209 void setNumArgs(ASTContext& C, unsigned NumArgs); 2210 2211 typedef ExprIterator arg_iterator; 2212 typedef ConstExprIterator const_arg_iterator; 2213 2214 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2215 arg_iterator arg_end() { 2216 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2217 } 2218 const_arg_iterator arg_begin() const { 2219 return SubExprs+PREARGS_START+getNumPreArgs(); 2220 } 2221 const_arg_iterator arg_end() const { 2222 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2223 } 2224 2225 /// This method provides fast access to all the subexpressions of 2226 /// a CallExpr without going through the slower virtual child_iterator 2227 /// interface. This provides efficient reverse iteration of the 2228 /// subexpressions. This is currently used for CFG construction. 2229 ArrayRef<Stmt*> getRawSubExprs() { 2230 return ArrayRef<Stmt*>(SubExprs, 2231 getNumPreArgs() + PREARGS_START + getNumArgs()); 2232 } 2233 2234 /// getNumCommas - Return the number of commas that must have been present in 2235 /// this function call. 2236 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2237 2238 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2239 /// not, return 0. 2240 unsigned isBuiltinCall() const; 2241 2242 /// \brief Returns \c true if this is a call to a builtin which does not 2243 /// evaluate side-effects within its arguments. 2244 bool isUnevaluatedBuiltinCall(ASTContext &Ctx) const; 2245 2246 /// getCallReturnType - Get the return type of the call expr. This is not 2247 /// always the type of the expr itself, if the return type is a reference 2248 /// type. 2249 QualType getCallReturnType() const; 2250 2251 SourceLocation getRParenLoc() const { return RParenLoc; } 2252 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2253 2254 SourceLocation getLocStart() const LLVM_READONLY; 2255 SourceLocation getLocEnd() const LLVM_READONLY; 2256 2257 static bool classof(const Stmt *T) { 2258 return T->getStmtClass() >= firstCallExprConstant && 2259 T->getStmtClass() <= lastCallExprConstant; 2260 } 2261 2262 // Iterators 2263 child_range children() { 2264 return child_range(&SubExprs[0], 2265 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2266 } 2267}; 2268 2269/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2270/// 2271class MemberExpr : public Expr { 2272 /// Extra data stored in some member expressions. 2273 struct MemberNameQualifier { 2274 /// \brief The nested-name-specifier that qualifies the name, including 2275 /// source-location information. 2276 NestedNameSpecifierLoc QualifierLoc; 2277 2278 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2279 /// name qualifiers. 2280 DeclAccessPair FoundDecl; 2281 }; 2282 2283 /// Base - the expression for the base pointer or structure references. In 2284 /// X.F, this is "X". 2285 Stmt *Base; 2286 2287 /// MemberDecl - This is the decl being referenced by the field/member name. 2288 /// In X.F, this is the decl referenced by F. 2289 ValueDecl *MemberDecl; 2290 2291 /// MemberDNLoc - Provides source/type location info for the 2292 /// declaration name embedded in MemberDecl. 2293 DeclarationNameLoc MemberDNLoc; 2294 2295 /// MemberLoc - This is the location of the member name. 2296 SourceLocation MemberLoc; 2297 2298 /// IsArrow - True if this is "X->F", false if this is "X.F". 2299 bool IsArrow : 1; 2300 2301 /// \brief True if this member expression used a nested-name-specifier to 2302 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2303 /// declaration. When true, a MemberNameQualifier 2304 /// structure is allocated immediately after the MemberExpr. 2305 bool HasQualifierOrFoundDecl : 1; 2306 2307 /// \brief True if this member expression specified a template keyword 2308 /// and/or a template argument list explicitly, e.g., x->f<int>, 2309 /// x->template f, x->template f<int>. 2310 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2311 /// TemplateArguments (if any) are allocated immediately after 2312 /// the MemberExpr or, if the member expression also has a qualifier, 2313 /// after the MemberNameQualifier structure. 2314 bool HasTemplateKWAndArgsInfo : 1; 2315 2316 /// \brief True if this member expression refers to a method that 2317 /// was resolved from an overloaded set having size greater than 1. 2318 bool HadMultipleCandidates : 1; 2319 2320 /// \brief Retrieve the qualifier that preceded the member name, if any. 2321 MemberNameQualifier *getMemberQualifier() { 2322 assert(HasQualifierOrFoundDecl); 2323 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2324 } 2325 2326 /// \brief Retrieve the qualifier that preceded the member name, if any. 2327 const MemberNameQualifier *getMemberQualifier() const { 2328 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2329 } 2330 2331public: 2332 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2333 const DeclarationNameInfo &NameInfo, QualType ty, 2334 ExprValueKind VK, ExprObjectKind OK) 2335 : Expr(MemberExprClass, ty, VK, OK, 2336 base->isTypeDependent(), 2337 base->isValueDependent(), 2338 base->isInstantiationDependent(), 2339 base->containsUnexpandedParameterPack()), 2340 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()), 2341 MemberLoc(NameInfo.getLoc()), IsArrow(isarrow), 2342 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2343 HadMultipleCandidates(false) { 2344 assert(memberdecl->getDeclName() == NameInfo.getName()); 2345 } 2346 2347 // NOTE: this constructor should be used only when it is known that 2348 // the member name can not provide additional syntactic info 2349 // (i.e., source locations for C++ operator names or type source info 2350 // for constructors, destructors and conversion operators). 2351 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2352 SourceLocation l, QualType ty, 2353 ExprValueKind VK, ExprObjectKind OK) 2354 : Expr(MemberExprClass, ty, VK, OK, 2355 base->isTypeDependent(), base->isValueDependent(), 2356 base->isInstantiationDependent(), 2357 base->containsUnexpandedParameterPack()), 2358 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l), 2359 IsArrow(isarrow), 2360 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2361 HadMultipleCandidates(false) {} 2362 2363 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2364 NestedNameSpecifierLoc QualifierLoc, 2365 SourceLocation TemplateKWLoc, 2366 ValueDecl *memberdecl, DeclAccessPair founddecl, 2367 DeclarationNameInfo MemberNameInfo, 2368 const TemplateArgumentListInfo *targs, 2369 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2370 2371 void setBase(Expr *E) { Base = E; } 2372 Expr *getBase() const { return cast<Expr>(Base); } 2373 2374 /// \brief Retrieve the member declaration to which this expression refers. 2375 /// 2376 /// The returned declaration will either be a FieldDecl or (in C++) 2377 /// a CXXMethodDecl. 2378 ValueDecl *getMemberDecl() const { return MemberDecl; } 2379 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2380 2381 /// \brief Retrieves the declaration found by lookup. 2382 DeclAccessPair getFoundDecl() const { 2383 if (!HasQualifierOrFoundDecl) 2384 return DeclAccessPair::make(getMemberDecl(), 2385 getMemberDecl()->getAccess()); 2386 return getMemberQualifier()->FoundDecl; 2387 } 2388 2389 /// \brief Determines whether this member expression actually had 2390 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2391 /// x->Base::foo. 2392 bool hasQualifier() const { return getQualifier() != 0; } 2393 2394 /// \brief If the member name was qualified, retrieves the 2395 /// nested-name-specifier that precedes the member name. Otherwise, returns 2396 /// NULL. 2397 NestedNameSpecifier *getQualifier() const { 2398 if (!HasQualifierOrFoundDecl) 2399 return 0; 2400 2401 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2402 } 2403 2404 /// \brief If the member name was qualified, retrieves the 2405 /// nested-name-specifier that precedes the member name, with source-location 2406 /// information. 2407 NestedNameSpecifierLoc getQualifierLoc() const { 2408 if (!hasQualifier()) 2409 return NestedNameSpecifierLoc(); 2410 2411 return getMemberQualifier()->QualifierLoc; 2412 } 2413 2414 /// \brief Return the optional template keyword and arguments info. 2415 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 2416 if (!HasTemplateKWAndArgsInfo) 2417 return 0; 2418 2419 if (!HasQualifierOrFoundDecl) 2420 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 2421 2422 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 2423 getMemberQualifier() + 1); 2424 } 2425 2426 /// \brief Return the optional template keyword and arguments info. 2427 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 2428 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo(); 2429 } 2430 2431 /// \brief Retrieve the location of the template keyword preceding 2432 /// the member name, if any. 2433 SourceLocation getTemplateKeywordLoc() const { 2434 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2435 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 2436 } 2437 2438 /// \brief Retrieve the location of the left angle bracket starting the 2439 /// explicit template argument list following the member name, if any. 2440 SourceLocation getLAngleLoc() const { 2441 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2442 return getTemplateKWAndArgsInfo()->LAngleLoc; 2443 } 2444 2445 /// \brief Retrieve the location of the right angle bracket ending the 2446 /// explicit template argument list following the member name, if any. 2447 SourceLocation getRAngleLoc() const { 2448 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2449 return getTemplateKWAndArgsInfo()->RAngleLoc; 2450 } 2451 2452 /// Determines whether the member name was preceded by the template keyword. 2453 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2454 2455 /// \brief Determines whether the member name was followed by an 2456 /// explicit template argument list. 2457 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2458 2459 /// \brief Copies the template arguments (if present) into the given 2460 /// structure. 2461 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2462 if (hasExplicitTemplateArgs()) 2463 getExplicitTemplateArgs().copyInto(List); 2464 } 2465 2466 /// \brief Retrieve the explicit template argument list that 2467 /// follow the member template name. This must only be called on an 2468 /// expression with explicit template arguments. 2469 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2470 assert(hasExplicitTemplateArgs()); 2471 return *getTemplateKWAndArgsInfo(); 2472 } 2473 2474 /// \brief Retrieve the explicit template argument list that 2475 /// followed the member template name. This must only be called on 2476 /// an expression with explicit template arguments. 2477 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2478 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2479 } 2480 2481 /// \brief Retrieves the optional explicit template arguments. 2482 /// This points to the same data as getExplicitTemplateArgs(), but 2483 /// returns null if there are no explicit template arguments. 2484 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2485 if (!hasExplicitTemplateArgs()) return 0; 2486 return &getExplicitTemplateArgs(); 2487 } 2488 2489 /// \brief Retrieve the template arguments provided as part of this 2490 /// template-id. 2491 const TemplateArgumentLoc *getTemplateArgs() const { 2492 if (!hasExplicitTemplateArgs()) 2493 return 0; 2494 2495 return getExplicitTemplateArgs().getTemplateArgs(); 2496 } 2497 2498 /// \brief Retrieve the number of template arguments provided as part of this 2499 /// template-id. 2500 unsigned getNumTemplateArgs() const { 2501 if (!hasExplicitTemplateArgs()) 2502 return 0; 2503 2504 return getExplicitTemplateArgs().NumTemplateArgs; 2505 } 2506 2507 /// \brief Retrieve the member declaration name info. 2508 DeclarationNameInfo getMemberNameInfo() const { 2509 return DeclarationNameInfo(MemberDecl->getDeclName(), 2510 MemberLoc, MemberDNLoc); 2511 } 2512 2513 bool isArrow() const { return IsArrow; } 2514 void setArrow(bool A) { IsArrow = A; } 2515 2516 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2517 /// location of 'F'. 2518 SourceLocation getMemberLoc() const { return MemberLoc; } 2519 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2520 2521 SourceLocation getLocStart() const LLVM_READONLY; 2522 SourceLocation getLocEnd() const LLVM_READONLY; 2523 2524 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; } 2525 2526 /// \brief Determine whether the base of this explicit is implicit. 2527 bool isImplicitAccess() const { 2528 return getBase() && getBase()->isImplicitCXXThis(); 2529 } 2530 2531 /// \brief Returns true if this member expression refers to a method that 2532 /// was resolved from an overloaded set having size greater than 1. 2533 bool hadMultipleCandidates() const { 2534 return HadMultipleCandidates; 2535 } 2536 /// \brief Sets the flag telling whether this expression refers to 2537 /// a method that was resolved from an overloaded set having size 2538 /// greater than 1. 2539 void setHadMultipleCandidates(bool V = true) { 2540 HadMultipleCandidates = V; 2541 } 2542 2543 static bool classof(const Stmt *T) { 2544 return T->getStmtClass() == MemberExprClass; 2545 } 2546 2547 // Iterators 2548 child_range children() { return child_range(&Base, &Base+1); } 2549 2550 friend class ASTReader; 2551 friend class ASTStmtWriter; 2552}; 2553 2554/// CompoundLiteralExpr - [C99 6.5.2.5] 2555/// 2556class CompoundLiteralExpr : public Expr { 2557 /// LParenLoc - If non-null, this is the location of the left paren in a 2558 /// compound literal like "(int){4}". This can be null if this is a 2559 /// synthesized compound expression. 2560 SourceLocation LParenLoc; 2561 2562 /// The type as written. This can be an incomplete array type, in 2563 /// which case the actual expression type will be different. 2564 /// The int part of the pair stores whether this expr is file scope. 2565 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope; 2566 Stmt *Init; 2567public: 2568 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2569 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2570 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2571 tinfo->getType()->isDependentType(), 2572 init->isValueDependent(), 2573 (init->isInstantiationDependent() || 2574 tinfo->getType()->isInstantiationDependentType()), 2575 init->containsUnexpandedParameterPack()), 2576 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {} 2577 2578 /// \brief Construct an empty compound literal. 2579 explicit CompoundLiteralExpr(EmptyShell Empty) 2580 : Expr(CompoundLiteralExprClass, Empty) { } 2581 2582 const Expr *getInitializer() const { return cast<Expr>(Init); } 2583 Expr *getInitializer() { return cast<Expr>(Init); } 2584 void setInitializer(Expr *E) { Init = E; } 2585 2586 bool isFileScope() const { return TInfoAndScope.getInt(); } 2587 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); } 2588 2589 SourceLocation getLParenLoc() const { return LParenLoc; } 2590 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2591 2592 TypeSourceInfo *getTypeSourceInfo() const { 2593 return TInfoAndScope.getPointer(); 2594 } 2595 void setTypeSourceInfo(TypeSourceInfo *tinfo) { 2596 TInfoAndScope.setPointer(tinfo); 2597 } 2598 2599 SourceLocation getLocStart() const LLVM_READONLY { 2600 // FIXME: Init should never be null. 2601 if (!Init) 2602 return SourceLocation(); 2603 if (LParenLoc.isInvalid()) 2604 return Init->getLocStart(); 2605 return LParenLoc; 2606 } 2607 SourceLocation getLocEnd() const LLVM_READONLY { 2608 // FIXME: Init should never be null. 2609 if (!Init) 2610 return SourceLocation(); 2611 return Init->getLocEnd(); 2612 } 2613 2614 static bool classof(const Stmt *T) { 2615 return T->getStmtClass() == CompoundLiteralExprClass; 2616 } 2617 2618 // Iterators 2619 child_range children() { return child_range(&Init, &Init+1); } 2620}; 2621 2622/// CastExpr - Base class for type casts, including both implicit 2623/// casts (ImplicitCastExpr) and explicit casts that have some 2624/// representation in the source code (ExplicitCastExpr's derived 2625/// classes). 2626class CastExpr : public Expr { 2627public: 2628 typedef clang::CastKind CastKind; 2629 2630private: 2631 Stmt *Op; 2632 2633 void CheckCastConsistency() const; 2634 2635 const CXXBaseSpecifier * const *path_buffer() const { 2636 return const_cast<CastExpr*>(this)->path_buffer(); 2637 } 2638 CXXBaseSpecifier **path_buffer(); 2639 2640 void setBasePathSize(unsigned basePathSize) { 2641 CastExprBits.BasePathSize = basePathSize; 2642 assert(CastExprBits.BasePathSize == basePathSize && 2643 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2644 } 2645 2646protected: 2647 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2648 const CastKind kind, Expr *op, unsigned BasePathSize) : 2649 Expr(SC, ty, VK, OK_Ordinary, 2650 // Cast expressions are type-dependent if the type is 2651 // dependent (C++ [temp.dep.expr]p3). 2652 ty->isDependentType(), 2653 // Cast expressions are value-dependent if the type is 2654 // dependent or if the subexpression is value-dependent. 2655 ty->isDependentType() || (op && op->isValueDependent()), 2656 (ty->isInstantiationDependentType() || 2657 (op && op->isInstantiationDependent())), 2658 (ty->containsUnexpandedParameterPack() || 2659 (op && op->containsUnexpandedParameterPack()))), 2660 Op(op) { 2661 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2662 CastExprBits.Kind = kind; 2663 setBasePathSize(BasePathSize); 2664#ifndef NDEBUG 2665 CheckCastConsistency(); 2666#endif 2667 } 2668 2669 /// \brief Construct an empty cast. 2670 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2671 : Expr(SC, Empty) { 2672 setBasePathSize(BasePathSize); 2673 } 2674 2675public: 2676 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2677 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2678 const char *getCastKindName() const; 2679 2680 Expr *getSubExpr() { return cast<Expr>(Op); } 2681 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2682 void setSubExpr(Expr *E) { Op = E; } 2683 2684 /// \brief Retrieve the cast subexpression as it was written in the source 2685 /// code, looking through any implicit casts or other intermediate nodes 2686 /// introduced by semantic analysis. 2687 Expr *getSubExprAsWritten(); 2688 const Expr *getSubExprAsWritten() const { 2689 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2690 } 2691 2692 typedef CXXBaseSpecifier **path_iterator; 2693 typedef const CXXBaseSpecifier * const *path_const_iterator; 2694 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2695 unsigned path_size() const { return CastExprBits.BasePathSize; } 2696 path_iterator path_begin() { return path_buffer(); } 2697 path_iterator path_end() { return path_buffer() + path_size(); } 2698 path_const_iterator path_begin() const { return path_buffer(); } 2699 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2700 2701 void setCastPath(const CXXCastPath &Path); 2702 2703 static bool classof(const Stmt *T) { 2704 return T->getStmtClass() >= firstCastExprConstant && 2705 T->getStmtClass() <= lastCastExprConstant; 2706 } 2707 2708 // Iterators 2709 child_range children() { return child_range(&Op, &Op+1); } 2710}; 2711 2712/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2713/// conversions, which have no direct representation in the original 2714/// source code. For example: converting T[]->T*, void f()->void 2715/// (*f)(), float->double, short->int, etc. 2716/// 2717/// In C, implicit casts always produce rvalues. However, in C++, an 2718/// implicit cast whose result is being bound to a reference will be 2719/// an lvalue or xvalue. For example: 2720/// 2721/// @code 2722/// class Base { }; 2723/// class Derived : public Base { }; 2724/// Derived &&ref(); 2725/// void f(Derived d) { 2726/// Base& b = d; // initializer is an ImplicitCastExpr 2727/// // to an lvalue of type Base 2728/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2729/// // to an xvalue of type Base 2730/// } 2731/// @endcode 2732class ImplicitCastExpr : public CastExpr { 2733private: 2734 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2735 unsigned BasePathLength, ExprValueKind VK) 2736 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2737 } 2738 2739 /// \brief Construct an empty implicit cast. 2740 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2741 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2742 2743public: 2744 enum OnStack_t { OnStack }; 2745 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2746 ExprValueKind VK) 2747 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2748 } 2749 2750 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2751 CastKind Kind, Expr *Operand, 2752 const CXXCastPath *BasePath, 2753 ExprValueKind Cat); 2754 2755 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2756 2757 SourceLocation getLocStart() const LLVM_READONLY { 2758 return getSubExpr()->getLocStart(); 2759 } 2760 SourceLocation getLocEnd() const LLVM_READONLY { 2761 return getSubExpr()->getLocEnd(); 2762 } 2763 2764 static bool classof(const Stmt *T) { 2765 return T->getStmtClass() == ImplicitCastExprClass; 2766 } 2767}; 2768 2769inline Expr *Expr::IgnoreImpCasts() { 2770 Expr *e = this; 2771 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2772 e = ice->getSubExpr(); 2773 return e; 2774} 2775 2776/// ExplicitCastExpr - An explicit cast written in the source 2777/// code. 2778/// 2779/// This class is effectively an abstract class, because it provides 2780/// the basic representation of an explicitly-written cast without 2781/// specifying which kind of cast (C cast, functional cast, static 2782/// cast, etc.) was written; specific derived classes represent the 2783/// particular style of cast and its location information. 2784/// 2785/// Unlike implicit casts, explicit cast nodes have two different 2786/// types: the type that was written into the source code, and the 2787/// actual type of the expression as determined by semantic 2788/// analysis. These types may differ slightly. For example, in C++ one 2789/// can cast to a reference type, which indicates that the resulting 2790/// expression will be an lvalue or xvalue. The reference type, however, 2791/// will not be used as the type of the expression. 2792class ExplicitCastExpr : public CastExpr { 2793 /// TInfo - Source type info for the (written) type 2794 /// this expression is casting to. 2795 TypeSourceInfo *TInfo; 2796 2797protected: 2798 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2799 CastKind kind, Expr *op, unsigned PathSize, 2800 TypeSourceInfo *writtenTy) 2801 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2802 2803 /// \brief Construct an empty explicit cast. 2804 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2805 : CastExpr(SC, Shell, PathSize) { } 2806 2807public: 2808 /// getTypeInfoAsWritten - Returns the type source info for the type 2809 /// that this expression is casting to. 2810 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2811 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2812 2813 /// getTypeAsWritten - Returns the type that this expression is 2814 /// casting to, as written in the source code. 2815 QualType getTypeAsWritten() const { return TInfo->getType(); } 2816 2817 static bool classof(const Stmt *T) { 2818 return T->getStmtClass() >= firstExplicitCastExprConstant && 2819 T->getStmtClass() <= lastExplicitCastExprConstant; 2820 } 2821}; 2822 2823/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2824/// cast in C++ (C++ [expr.cast]), which uses the syntax 2825/// (Type)expr. For example: @c (int)f. 2826class CStyleCastExpr : public ExplicitCastExpr { 2827 SourceLocation LPLoc; // the location of the left paren 2828 SourceLocation RPLoc; // the location of the right paren 2829 2830 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2831 unsigned PathSize, TypeSourceInfo *writtenTy, 2832 SourceLocation l, SourceLocation r) 2833 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2834 writtenTy), LPLoc(l), RPLoc(r) {} 2835 2836 /// \brief Construct an empty C-style explicit cast. 2837 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2838 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2839 2840public: 2841 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2842 ExprValueKind VK, CastKind K, 2843 Expr *Op, const CXXCastPath *BasePath, 2844 TypeSourceInfo *WrittenTy, SourceLocation L, 2845 SourceLocation R); 2846 2847 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2848 2849 SourceLocation getLParenLoc() const { return LPLoc; } 2850 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2851 2852 SourceLocation getRParenLoc() const { return RPLoc; } 2853 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2854 2855 SourceLocation getLocStart() const LLVM_READONLY { return LPLoc; } 2856 SourceLocation getLocEnd() const LLVM_READONLY { 2857 return getSubExpr()->getLocEnd(); 2858 } 2859 2860 static bool classof(const Stmt *T) { 2861 return T->getStmtClass() == CStyleCastExprClass; 2862 } 2863}; 2864 2865/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2866/// 2867/// This expression node kind describes a builtin binary operation, 2868/// such as "x + y" for integer values "x" and "y". The operands will 2869/// already have been converted to appropriate types (e.g., by 2870/// performing promotions or conversions). 2871/// 2872/// In C++, where operators may be overloaded, a different kind of 2873/// expression node (CXXOperatorCallExpr) is used to express the 2874/// invocation of an overloaded operator with operator syntax. Within 2875/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2876/// used to store an expression "x + y" depends on the subexpressions 2877/// for x and y. If neither x or y is type-dependent, and the "+" 2878/// operator resolves to a built-in operation, BinaryOperator will be 2879/// used to express the computation (x and y may still be 2880/// value-dependent). If either x or y is type-dependent, or if the 2881/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2882/// be used to express the computation. 2883class BinaryOperator : public Expr { 2884public: 2885 typedef BinaryOperatorKind Opcode; 2886 2887private: 2888 unsigned Opc : 6; 2889 2890 // Records the FP_CONTRACT pragma status at the point that this binary 2891 // operator was parsed. This bit is only meaningful for operations on 2892 // floating point types. For all other types it should default to 2893 // false. 2894 unsigned FPContractable : 1; 2895 SourceLocation OpLoc; 2896 2897 enum { LHS, RHS, END_EXPR }; 2898 Stmt* SubExprs[END_EXPR]; 2899public: 2900 2901 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2902 ExprValueKind VK, ExprObjectKind OK, 2903 SourceLocation opLoc, bool fpContractable) 2904 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2905 lhs->isTypeDependent() || rhs->isTypeDependent(), 2906 lhs->isValueDependent() || rhs->isValueDependent(), 2907 (lhs->isInstantiationDependent() || 2908 rhs->isInstantiationDependent()), 2909 (lhs->containsUnexpandedParameterPack() || 2910 rhs->containsUnexpandedParameterPack())), 2911 Opc(opc), FPContractable(fpContractable), OpLoc(opLoc) { 2912 SubExprs[LHS] = lhs; 2913 SubExprs[RHS] = rhs; 2914 assert(!isCompoundAssignmentOp() && 2915 "Use CompoundAssignOperator for compound assignments"); 2916 } 2917 2918 /// \brief Construct an empty binary operator. 2919 explicit BinaryOperator(EmptyShell Empty) 2920 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2921 2922 SourceLocation getExprLoc() const LLVM_READONLY { return OpLoc; } 2923 SourceLocation getOperatorLoc() const { return OpLoc; } 2924 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2925 2926 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2927 void setOpcode(Opcode O) { Opc = O; } 2928 2929 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2930 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2931 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2932 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2933 2934 SourceLocation getLocStart() const LLVM_READONLY { 2935 return getLHS()->getLocStart(); 2936 } 2937 SourceLocation getLocEnd() const LLVM_READONLY { 2938 return getRHS()->getLocEnd(); 2939 } 2940 2941 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2942 /// corresponds to, e.g. "<<=". 2943 static StringRef getOpcodeStr(Opcode Op); 2944 2945 StringRef getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2946 2947 /// \brief Retrieve the binary opcode that corresponds to the given 2948 /// overloaded operator. 2949 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2950 2951 /// \brief Retrieve the overloaded operator kind that corresponds to 2952 /// the given binary opcode. 2953 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2954 2955 /// predicates to categorize the respective opcodes. 2956 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2957 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2958 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2959 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2960 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2961 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2962 2963 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2964 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2965 2966 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2967 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2968 2969 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2970 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2971 2972 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2973 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2974 2975 static Opcode negateComparisonOp(Opcode Opc) { 2976 switch (Opc) { 2977 default: 2978 llvm_unreachable("Not a comparsion operator."); 2979 case BO_LT: return BO_GE; 2980 case BO_GT: return BO_LE; 2981 case BO_LE: return BO_GT; 2982 case BO_GE: return BO_LT; 2983 case BO_EQ: return BO_NE; 2984 case BO_NE: return BO_EQ; 2985 } 2986 } 2987 2988 static Opcode reverseComparisonOp(Opcode Opc) { 2989 switch (Opc) { 2990 default: 2991 llvm_unreachable("Not a comparsion operator."); 2992 case BO_LT: return BO_GT; 2993 case BO_GT: return BO_LT; 2994 case BO_LE: return BO_GE; 2995 case BO_GE: return BO_LE; 2996 case BO_EQ: 2997 case BO_NE: 2998 return Opc; 2999 } 3000 } 3001 3002 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 3003 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 3004 3005 static bool isAssignmentOp(Opcode Opc) { 3006 return Opc >= BO_Assign && Opc <= BO_OrAssign; 3007 } 3008 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 3009 3010 static bool isCompoundAssignmentOp(Opcode Opc) { 3011 return Opc > BO_Assign && Opc <= BO_OrAssign; 3012 } 3013 bool isCompoundAssignmentOp() const { 3014 return isCompoundAssignmentOp(getOpcode()); 3015 } 3016 static Opcode getOpForCompoundAssignment(Opcode Opc) { 3017 assert(isCompoundAssignmentOp(Opc)); 3018 if (Opc >= BO_AndAssign) 3019 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 3020 else 3021 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 3022 } 3023 3024 static bool isShiftAssignOp(Opcode Opc) { 3025 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 3026 } 3027 bool isShiftAssignOp() const { 3028 return isShiftAssignOp(getOpcode()); 3029 } 3030 3031 static bool classof(const Stmt *S) { 3032 return S->getStmtClass() >= firstBinaryOperatorConstant && 3033 S->getStmtClass() <= lastBinaryOperatorConstant; 3034 } 3035 3036 // Iterators 3037 child_range children() { 3038 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3039 } 3040 3041 // Set the FP contractability status of this operator. Only meaningful for 3042 // operations on floating point types. 3043 void setFPContractable(bool FPC) { FPContractable = FPC; } 3044 3045 // Get the FP contractability status of this operator. Only meaningful for 3046 // operations on floating point types. 3047 bool isFPContractable() const { return FPContractable; } 3048 3049protected: 3050 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 3051 ExprValueKind VK, ExprObjectKind OK, 3052 SourceLocation opLoc, bool fpContractable, bool dead2) 3053 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 3054 lhs->isTypeDependent() || rhs->isTypeDependent(), 3055 lhs->isValueDependent() || rhs->isValueDependent(), 3056 (lhs->isInstantiationDependent() || 3057 rhs->isInstantiationDependent()), 3058 (lhs->containsUnexpandedParameterPack() || 3059 rhs->containsUnexpandedParameterPack())), 3060 Opc(opc), FPContractable(fpContractable), OpLoc(opLoc) { 3061 SubExprs[LHS] = lhs; 3062 SubExprs[RHS] = rhs; 3063 } 3064 3065 BinaryOperator(StmtClass SC, EmptyShell Empty) 3066 : Expr(SC, Empty), Opc(BO_MulAssign) { } 3067}; 3068 3069/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 3070/// track of the type the operation is performed in. Due to the semantics of 3071/// these operators, the operands are promoted, the arithmetic performed, an 3072/// implicit conversion back to the result type done, then the assignment takes 3073/// place. This captures the intermediate type which the computation is done 3074/// in. 3075class CompoundAssignOperator : public BinaryOperator { 3076 QualType ComputationLHSType; 3077 QualType ComputationResultType; 3078public: 3079 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 3080 ExprValueKind VK, ExprObjectKind OK, 3081 QualType CompLHSType, QualType CompResultType, 3082 SourceLocation OpLoc, bool fpContractable) 3083 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, fpContractable, 3084 true), 3085 ComputationLHSType(CompLHSType), 3086 ComputationResultType(CompResultType) { 3087 assert(isCompoundAssignmentOp() && 3088 "Only should be used for compound assignments"); 3089 } 3090 3091 /// \brief Build an empty compound assignment operator expression. 3092 explicit CompoundAssignOperator(EmptyShell Empty) 3093 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 3094 3095 // The two computation types are the type the LHS is converted 3096 // to for the computation and the type of the result; the two are 3097 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 3098 QualType getComputationLHSType() const { return ComputationLHSType; } 3099 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 3100 3101 QualType getComputationResultType() const { return ComputationResultType; } 3102 void setComputationResultType(QualType T) { ComputationResultType = T; } 3103 3104 static bool classof(const Stmt *S) { 3105 return S->getStmtClass() == CompoundAssignOperatorClass; 3106 } 3107}; 3108 3109/// AbstractConditionalOperator - An abstract base class for 3110/// ConditionalOperator and BinaryConditionalOperator. 3111class AbstractConditionalOperator : public Expr { 3112 SourceLocation QuestionLoc, ColonLoc; 3113 friend class ASTStmtReader; 3114 3115protected: 3116 AbstractConditionalOperator(StmtClass SC, QualType T, 3117 ExprValueKind VK, ExprObjectKind OK, 3118 bool TD, bool VD, bool ID, 3119 bool ContainsUnexpandedParameterPack, 3120 SourceLocation qloc, 3121 SourceLocation cloc) 3122 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 3123 QuestionLoc(qloc), ColonLoc(cloc) {} 3124 3125 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 3126 : Expr(SC, Empty) { } 3127 3128public: 3129 // getCond - Return the expression representing the condition for 3130 // the ?: operator. 3131 Expr *getCond() const; 3132 3133 // getTrueExpr - Return the subexpression representing the value of 3134 // the expression if the condition evaluates to true. 3135 Expr *getTrueExpr() const; 3136 3137 // getFalseExpr - Return the subexpression representing the value of 3138 // the expression if the condition evaluates to false. This is 3139 // the same as getRHS. 3140 Expr *getFalseExpr() const; 3141 3142 SourceLocation getQuestionLoc() const { return QuestionLoc; } 3143 SourceLocation getColonLoc() const { return ColonLoc; } 3144 3145 static bool classof(const Stmt *T) { 3146 return T->getStmtClass() == ConditionalOperatorClass || 3147 T->getStmtClass() == BinaryConditionalOperatorClass; 3148 } 3149}; 3150 3151/// ConditionalOperator - The ?: ternary operator. The GNU "missing 3152/// middle" extension is a BinaryConditionalOperator. 3153class ConditionalOperator : public AbstractConditionalOperator { 3154 enum { COND, LHS, RHS, END_EXPR }; 3155 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3156 3157 friend class ASTStmtReader; 3158public: 3159 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 3160 SourceLocation CLoc, Expr *rhs, 3161 QualType t, ExprValueKind VK, ExprObjectKind OK) 3162 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 3163 // FIXME: the type of the conditional operator doesn't 3164 // depend on the type of the conditional, but the standard 3165 // seems to imply that it could. File a bug! 3166 (lhs->isTypeDependent() || rhs->isTypeDependent()), 3167 (cond->isValueDependent() || lhs->isValueDependent() || 3168 rhs->isValueDependent()), 3169 (cond->isInstantiationDependent() || 3170 lhs->isInstantiationDependent() || 3171 rhs->isInstantiationDependent()), 3172 (cond->containsUnexpandedParameterPack() || 3173 lhs->containsUnexpandedParameterPack() || 3174 rhs->containsUnexpandedParameterPack()), 3175 QLoc, CLoc) { 3176 SubExprs[COND] = cond; 3177 SubExprs[LHS] = lhs; 3178 SubExprs[RHS] = rhs; 3179 } 3180 3181 /// \brief Build an empty conditional operator. 3182 explicit ConditionalOperator(EmptyShell Empty) 3183 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 3184 3185 // getCond - Return the expression representing the condition for 3186 // the ?: operator. 3187 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3188 3189 // getTrueExpr - Return the subexpression representing the value of 3190 // the expression if the condition evaluates to true. 3191 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3192 3193 // getFalseExpr - Return the subexpression representing the value of 3194 // the expression if the condition evaluates to false. This is 3195 // the same as getRHS. 3196 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3197 3198 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3199 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3200 3201 SourceLocation getLocStart() const LLVM_READONLY { 3202 return getCond()->getLocStart(); 3203 } 3204 SourceLocation getLocEnd() const LLVM_READONLY { 3205 return getRHS()->getLocEnd(); 3206 } 3207 3208 static bool classof(const Stmt *T) { 3209 return T->getStmtClass() == ConditionalOperatorClass; 3210 } 3211 3212 // Iterators 3213 child_range children() { 3214 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3215 } 3216}; 3217 3218/// BinaryConditionalOperator - The GNU extension to the conditional 3219/// operator which allows the middle operand to be omitted. 3220/// 3221/// This is a different expression kind on the assumption that almost 3222/// every client ends up needing to know that these are different. 3223class BinaryConditionalOperator : public AbstractConditionalOperator { 3224 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3225 3226 /// - the common condition/left-hand-side expression, which will be 3227 /// evaluated as the opaque value 3228 /// - the condition, expressed in terms of the opaque value 3229 /// - the left-hand-side, expressed in terms of the opaque value 3230 /// - the right-hand-side 3231 Stmt *SubExprs[NUM_SUBEXPRS]; 3232 OpaqueValueExpr *OpaqueValue; 3233 3234 friend class ASTStmtReader; 3235public: 3236 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3237 Expr *cond, Expr *lhs, Expr *rhs, 3238 SourceLocation qloc, SourceLocation cloc, 3239 QualType t, ExprValueKind VK, ExprObjectKind OK) 3240 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3241 (common->isTypeDependent() || rhs->isTypeDependent()), 3242 (common->isValueDependent() || rhs->isValueDependent()), 3243 (common->isInstantiationDependent() || 3244 rhs->isInstantiationDependent()), 3245 (common->containsUnexpandedParameterPack() || 3246 rhs->containsUnexpandedParameterPack()), 3247 qloc, cloc), 3248 OpaqueValue(opaqueValue) { 3249 SubExprs[COMMON] = common; 3250 SubExprs[COND] = cond; 3251 SubExprs[LHS] = lhs; 3252 SubExprs[RHS] = rhs; 3253 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value"); 3254 } 3255 3256 /// \brief Build an empty conditional operator. 3257 explicit BinaryConditionalOperator(EmptyShell Empty) 3258 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3259 3260 /// \brief getCommon - Return the common expression, written to the 3261 /// left of the condition. The opaque value will be bound to the 3262 /// result of this expression. 3263 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3264 3265 /// \brief getOpaqueValue - Return the opaque value placeholder. 3266 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3267 3268 /// \brief getCond - Return the condition expression; this is defined 3269 /// in terms of the opaque value. 3270 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3271 3272 /// \brief getTrueExpr - Return the subexpression which will be 3273 /// evaluated if the condition evaluates to true; this is defined 3274 /// in terms of the opaque value. 3275 Expr *getTrueExpr() const { 3276 return cast<Expr>(SubExprs[LHS]); 3277 } 3278 3279 /// \brief getFalseExpr - Return the subexpression which will be 3280 /// evaluated if the condnition evaluates to false; this is 3281 /// defined in terms of the opaque value. 3282 Expr *getFalseExpr() const { 3283 return cast<Expr>(SubExprs[RHS]); 3284 } 3285 3286 SourceLocation getLocStart() const LLVM_READONLY { 3287 return getCommon()->getLocStart(); 3288 } 3289 SourceLocation getLocEnd() const LLVM_READONLY { 3290 return getFalseExpr()->getLocEnd(); 3291 } 3292 3293 static bool classof(const Stmt *T) { 3294 return T->getStmtClass() == BinaryConditionalOperatorClass; 3295 } 3296 3297 // Iterators 3298 child_range children() { 3299 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3300 } 3301}; 3302 3303inline Expr *AbstractConditionalOperator::getCond() const { 3304 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3305 return co->getCond(); 3306 return cast<BinaryConditionalOperator>(this)->getCond(); 3307} 3308 3309inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3310 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3311 return co->getTrueExpr(); 3312 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3313} 3314 3315inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3316 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3317 return co->getFalseExpr(); 3318 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3319} 3320 3321/// AddrLabelExpr - The GNU address of label extension, representing &&label. 3322class AddrLabelExpr : public Expr { 3323 SourceLocation AmpAmpLoc, LabelLoc; 3324 LabelDecl *Label; 3325public: 3326 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3327 QualType t) 3328 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3329 false), 3330 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3331 3332 /// \brief Build an empty address of a label expression. 3333 explicit AddrLabelExpr(EmptyShell Empty) 3334 : Expr(AddrLabelExprClass, Empty) { } 3335 3336 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3337 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3338 SourceLocation getLabelLoc() const { return LabelLoc; } 3339 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3340 3341 SourceLocation getLocStart() const LLVM_READONLY { return AmpAmpLoc; } 3342 SourceLocation getLocEnd() const LLVM_READONLY { return LabelLoc; } 3343 3344 LabelDecl *getLabel() const { return Label; } 3345 void setLabel(LabelDecl *L) { Label = L; } 3346 3347 static bool classof(const Stmt *T) { 3348 return T->getStmtClass() == AddrLabelExprClass; 3349 } 3350 3351 // Iterators 3352 child_range children() { return child_range(); } 3353}; 3354 3355/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3356/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3357/// takes the value of the last subexpression. 3358/// 3359/// A StmtExpr is always an r-value; values "returned" out of a 3360/// StmtExpr will be copied. 3361class StmtExpr : public Expr { 3362 Stmt *SubStmt; 3363 SourceLocation LParenLoc, RParenLoc; 3364public: 3365 // FIXME: Does type-dependence need to be computed differently? 3366 // FIXME: Do we need to compute instantiation instantiation-dependence for 3367 // statements? (ugh!) 3368 StmtExpr(CompoundStmt *substmt, QualType T, 3369 SourceLocation lp, SourceLocation rp) : 3370 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3371 T->isDependentType(), false, false, false), 3372 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3373 3374 /// \brief Build an empty statement expression. 3375 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3376 3377 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3378 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3379 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3380 3381 SourceLocation getLocStart() const LLVM_READONLY { return LParenLoc; } 3382 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3383 3384 SourceLocation getLParenLoc() const { return LParenLoc; } 3385 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3386 SourceLocation getRParenLoc() const { return RParenLoc; } 3387 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3388 3389 static bool classof(const Stmt *T) { 3390 return T->getStmtClass() == StmtExprClass; 3391 } 3392 3393 // Iterators 3394 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3395}; 3396 3397 3398/// ShuffleVectorExpr - clang-specific builtin-in function 3399/// __builtin_shufflevector. 3400/// This AST node represents a operator that does a constant 3401/// shuffle, similar to LLVM's shufflevector instruction. It takes 3402/// two vectors and a variable number of constant indices, 3403/// and returns the appropriately shuffled vector. 3404class ShuffleVectorExpr : public Expr { 3405 SourceLocation BuiltinLoc, RParenLoc; 3406 3407 // SubExprs - the list of values passed to the __builtin_shufflevector 3408 // function. The first two are vectors, and the rest are constant 3409 // indices. The number of values in this list is always 3410 // 2+the number of indices in the vector type. 3411 Stmt **SubExprs; 3412 unsigned NumExprs; 3413 3414public: 3415 ShuffleVectorExpr(ASTContext &C, ArrayRef<Expr*> args, QualType Type, 3416 SourceLocation BLoc, SourceLocation RP); 3417 3418 /// \brief Build an empty vector-shuffle expression. 3419 explicit ShuffleVectorExpr(EmptyShell Empty) 3420 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3421 3422 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3423 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3424 3425 SourceLocation getRParenLoc() const { return RParenLoc; } 3426 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3427 3428 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3429 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3430 3431 static bool classof(const Stmt *T) { 3432 return T->getStmtClass() == ShuffleVectorExprClass; 3433 } 3434 3435 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3436 /// constant expression, the actual arguments passed in, and the function 3437 /// pointers. 3438 unsigned getNumSubExprs() const { return NumExprs; } 3439 3440 /// \brief Retrieve the array of expressions. 3441 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3442 3443 /// getExpr - Return the Expr at the specified index. 3444 Expr *getExpr(unsigned Index) { 3445 assert((Index < NumExprs) && "Arg access out of range!"); 3446 return cast<Expr>(SubExprs[Index]); 3447 } 3448 const Expr *getExpr(unsigned Index) const { 3449 assert((Index < NumExprs) && "Arg access out of range!"); 3450 return cast<Expr>(SubExprs[Index]); 3451 } 3452 3453 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3454 3455 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) const { 3456 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3457 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3458 } 3459 3460 // Iterators 3461 child_range children() { 3462 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3463 } 3464}; 3465 3466/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3467/// This AST node is similar to the conditional operator (?:) in C, with 3468/// the following exceptions: 3469/// - the test expression must be a integer constant expression. 3470/// - the expression returned acts like the chosen subexpression in every 3471/// visible way: the type is the same as that of the chosen subexpression, 3472/// and all predicates (whether it's an l-value, whether it's an integer 3473/// constant expression, etc.) return the same result as for the chosen 3474/// sub-expression. 3475class ChooseExpr : public Expr { 3476 enum { COND, LHS, RHS, END_EXPR }; 3477 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3478 SourceLocation BuiltinLoc, RParenLoc; 3479public: 3480 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3481 QualType t, ExprValueKind VK, ExprObjectKind OK, 3482 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3483 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3484 (cond->isInstantiationDependent() || 3485 lhs->isInstantiationDependent() || 3486 rhs->isInstantiationDependent()), 3487 (cond->containsUnexpandedParameterPack() || 3488 lhs->containsUnexpandedParameterPack() || 3489 rhs->containsUnexpandedParameterPack())), 3490 BuiltinLoc(BLoc), RParenLoc(RP) { 3491 SubExprs[COND] = cond; 3492 SubExprs[LHS] = lhs; 3493 SubExprs[RHS] = rhs; 3494 } 3495 3496 /// \brief Build an empty __builtin_choose_expr. 3497 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3498 3499 /// isConditionTrue - Return whether the condition is true (i.e. not 3500 /// equal to zero). 3501 bool isConditionTrue(const ASTContext &C) const; 3502 3503 /// getChosenSubExpr - Return the subexpression chosen according to the 3504 /// condition. 3505 Expr *getChosenSubExpr(const ASTContext &C) const { 3506 return isConditionTrue(C) ? getLHS() : getRHS(); 3507 } 3508 3509 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3510 void setCond(Expr *E) { SubExprs[COND] = E; } 3511 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3512 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3513 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3514 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3515 3516 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3517 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3518 3519 SourceLocation getRParenLoc() const { return RParenLoc; } 3520 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3521 3522 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3523 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3524 3525 static bool classof(const Stmt *T) { 3526 return T->getStmtClass() == ChooseExprClass; 3527 } 3528 3529 // Iterators 3530 child_range children() { 3531 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3532 } 3533}; 3534 3535/// GNUNullExpr - Implements the GNU __null extension, which is a name 3536/// for a null pointer constant that has integral type (e.g., int or 3537/// long) and is the same size and alignment as a pointer. The __null 3538/// extension is typically only used by system headers, which define 3539/// NULL as __null in C++ rather than using 0 (which is an integer 3540/// that may not match the size of a pointer). 3541class GNUNullExpr : public Expr { 3542 /// TokenLoc - The location of the __null keyword. 3543 SourceLocation TokenLoc; 3544 3545public: 3546 GNUNullExpr(QualType Ty, SourceLocation Loc) 3547 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3548 false), 3549 TokenLoc(Loc) { } 3550 3551 /// \brief Build an empty GNU __null expression. 3552 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3553 3554 /// getTokenLocation - The location of the __null token. 3555 SourceLocation getTokenLocation() const { return TokenLoc; } 3556 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3557 3558 SourceLocation getLocStart() const LLVM_READONLY { return TokenLoc; } 3559 SourceLocation getLocEnd() const LLVM_READONLY { return TokenLoc; } 3560 3561 static bool classof(const Stmt *T) { 3562 return T->getStmtClass() == GNUNullExprClass; 3563 } 3564 3565 // Iterators 3566 child_range children() { return child_range(); } 3567}; 3568 3569/// VAArgExpr, used for the builtin function __builtin_va_arg. 3570class VAArgExpr : public Expr { 3571 Stmt *Val; 3572 TypeSourceInfo *TInfo; 3573 SourceLocation BuiltinLoc, RParenLoc; 3574public: 3575 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3576 SourceLocation RPLoc, QualType t) 3577 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3578 t->isDependentType(), false, 3579 (TInfo->getType()->isInstantiationDependentType() || 3580 e->isInstantiationDependent()), 3581 (TInfo->getType()->containsUnexpandedParameterPack() || 3582 e->containsUnexpandedParameterPack())), 3583 Val(e), TInfo(TInfo), 3584 BuiltinLoc(BLoc), 3585 RParenLoc(RPLoc) { } 3586 3587 /// \brief Create an empty __builtin_va_arg expression. 3588 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3589 3590 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3591 Expr *getSubExpr() { return cast<Expr>(Val); } 3592 void setSubExpr(Expr *E) { Val = E; } 3593 3594 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3595 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3596 3597 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3598 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3599 3600 SourceLocation getRParenLoc() const { return RParenLoc; } 3601 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3602 3603 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3604 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3605 3606 static bool classof(const Stmt *T) { 3607 return T->getStmtClass() == VAArgExprClass; 3608 } 3609 3610 // Iterators 3611 child_range children() { return child_range(&Val, &Val+1); } 3612}; 3613 3614/// @brief Describes an C or C++ initializer list. 3615/// 3616/// InitListExpr describes an initializer list, which can be used to 3617/// initialize objects of different types, including 3618/// struct/class/union types, arrays, and vectors. For example: 3619/// 3620/// @code 3621/// struct foo x = { 1, { 2, 3 } }; 3622/// @endcode 3623/// 3624/// Prior to semantic analysis, an initializer list will represent the 3625/// initializer list as written by the user, but will have the 3626/// placeholder type "void". This initializer list is called the 3627/// syntactic form of the initializer, and may contain C99 designated 3628/// initializers (represented as DesignatedInitExprs), initializations 3629/// of subobject members without explicit braces, and so on. Clients 3630/// interested in the original syntax of the initializer list should 3631/// use the syntactic form of the initializer list. 3632/// 3633/// After semantic analysis, the initializer list will represent the 3634/// semantic form of the initializer, where the initializations of all 3635/// subobjects are made explicit with nested InitListExpr nodes and 3636/// C99 designators have been eliminated by placing the designated 3637/// initializations into the subobject they initialize. Additionally, 3638/// any "holes" in the initialization, where no initializer has been 3639/// specified for a particular subobject, will be replaced with 3640/// implicitly-generated ImplicitValueInitExpr expressions that 3641/// value-initialize the subobjects. Note, however, that the 3642/// initializer lists may still have fewer initializers than there are 3643/// elements to initialize within the object. 3644/// 3645/// After semantic analysis has completed, given an initializer list, 3646/// method isSemanticForm() returns true if and only if this is the 3647/// semantic form of the initializer list (note: the same AST node 3648/// may at the same time be the syntactic form). 3649/// Given the semantic form of the initializer list, one can retrieve 3650/// the syntactic form of that initializer list (when different) 3651/// using method getSyntacticForm(); the method returns null if applied 3652/// to a initializer list which is already in syntactic form. 3653/// Similarly, given the syntactic form (i.e., an initializer list such 3654/// that isSemanticForm() returns false), one can retrieve the semantic 3655/// form using method getSemanticForm(). 3656/// Since many initializer lists have the same syntactic and semantic forms, 3657/// getSyntacticForm() may return NULL, indicating that the current 3658/// semantic initializer list also serves as its syntactic form. 3659class InitListExpr : public Expr { 3660 // FIXME: Eliminate this vector in favor of ASTContext allocation 3661 typedef ASTVector<Stmt *> InitExprsTy; 3662 InitExprsTy InitExprs; 3663 SourceLocation LBraceLoc, RBraceLoc; 3664 3665 /// The alternative form of the initializer list (if it exists). 3666 /// The int part of the pair stores whether this initalizer list is 3667 /// in semantic form. If not null, the pointer points to: 3668 /// - the syntactic form, if this is in semantic form; 3669 /// - the semantic form, if this is in syntactic form. 3670 llvm::PointerIntPair<InitListExpr *, 1, bool> AltForm; 3671 3672 /// \brief Either: 3673 /// If this initializer list initializes an array with more elements than 3674 /// there are initializers in the list, specifies an expression to be used 3675 /// for value initialization of the rest of the elements. 3676 /// Or 3677 /// If this initializer list initializes a union, specifies which 3678 /// field within the union will be initialized. 3679 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3680 3681public: 3682 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3683 ArrayRef<Expr*> initExprs, SourceLocation rbraceloc); 3684 3685 /// \brief Build an empty initializer list. 3686 explicit InitListExpr(EmptyShell Empty) 3687 : Expr(InitListExprClass, Empty) { } 3688 3689 unsigned getNumInits() const { return InitExprs.size(); } 3690 3691 /// \brief Retrieve the set of initializers. 3692 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3693 3694 const Expr *getInit(unsigned Init) const { 3695 assert(Init < getNumInits() && "Initializer access out of range!"); 3696 return cast_or_null<Expr>(InitExprs[Init]); 3697 } 3698 3699 Expr *getInit(unsigned Init) { 3700 assert(Init < getNumInits() && "Initializer access out of range!"); 3701 return cast_or_null<Expr>(InitExprs[Init]); 3702 } 3703 3704 void setInit(unsigned Init, Expr *expr) { 3705 assert(Init < getNumInits() && "Initializer access out of range!"); 3706 InitExprs[Init] = expr; 3707 } 3708 3709 /// \brief Reserve space for some number of initializers. 3710 void reserveInits(ASTContext &C, unsigned NumInits); 3711 3712 /// @brief Specify the number of initializers 3713 /// 3714 /// If there are more than @p NumInits initializers, the remaining 3715 /// initializers will be destroyed. If there are fewer than @p 3716 /// NumInits initializers, NULL expressions will be added for the 3717 /// unknown initializers. 3718 void resizeInits(ASTContext &Context, unsigned NumInits); 3719 3720 /// @brief Updates the initializer at index @p Init with the new 3721 /// expression @p expr, and returns the old expression at that 3722 /// location. 3723 /// 3724 /// When @p Init is out of range for this initializer list, the 3725 /// initializer list will be extended with NULL expressions to 3726 /// accommodate the new entry. 3727 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3728 3729 /// \brief If this initializer list initializes an array with more elements 3730 /// than there are initializers in the list, specifies an expression to be 3731 /// used for value initialization of the rest of the elements. 3732 Expr *getArrayFiller() { 3733 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3734 } 3735 const Expr *getArrayFiller() const { 3736 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3737 } 3738 void setArrayFiller(Expr *filler); 3739 3740 /// \brief Return true if this is an array initializer and its array "filler" 3741 /// has been set. 3742 bool hasArrayFiller() const { return getArrayFiller(); } 3743 3744 /// \brief If this initializes a union, specifies which field in the 3745 /// union to initialize. 3746 /// 3747 /// Typically, this field is the first named field within the 3748 /// union. However, a designated initializer can specify the 3749 /// initialization of a different field within the union. 3750 FieldDecl *getInitializedFieldInUnion() { 3751 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3752 } 3753 const FieldDecl *getInitializedFieldInUnion() const { 3754 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3755 } 3756 void setInitializedFieldInUnion(FieldDecl *FD) { 3757 ArrayFillerOrUnionFieldInit = FD; 3758 } 3759 3760 // Explicit InitListExpr's originate from source code (and have valid source 3761 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3762 bool isExplicit() { 3763 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3764 } 3765 3766 // Is this an initializer for an array of characters, initialized by a string 3767 // literal or an @encode? 3768 bool isStringLiteralInit() const; 3769 3770 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3771 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3772 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3773 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3774 3775 bool isSemanticForm() const { return AltForm.getInt(); } 3776 InitListExpr *getSemanticForm() const { 3777 return isSemanticForm() ? 0 : AltForm.getPointer(); 3778 } 3779 InitListExpr *getSyntacticForm() const { 3780 return isSemanticForm() ? AltForm.getPointer() : 0; 3781 } 3782 3783 void setSyntacticForm(InitListExpr *Init) { 3784 AltForm.setPointer(Init); 3785 AltForm.setInt(true); 3786 Init->AltForm.setPointer(this); 3787 Init->AltForm.setInt(false); 3788 } 3789 3790 bool hadArrayRangeDesignator() const { 3791 return InitListExprBits.HadArrayRangeDesignator != 0; 3792 } 3793 void sawArrayRangeDesignator(bool ARD = true) { 3794 InitListExprBits.HadArrayRangeDesignator = ARD; 3795 } 3796 3797 bool initializesStdInitializerList() const { 3798 return InitListExprBits.InitializesStdInitializerList != 0; 3799 } 3800 void setInitializesStdInitializerList(bool ISIL = true) { 3801 InitListExprBits.InitializesStdInitializerList = ISIL; 3802 } 3803 3804 SourceLocation getLocStart() const LLVM_READONLY; 3805 SourceLocation getLocEnd() const LLVM_READONLY; 3806 3807 static bool classof(const Stmt *T) { 3808 return T->getStmtClass() == InitListExprClass; 3809 } 3810 3811 // Iterators 3812 child_range children() { 3813 if (InitExprs.empty()) return child_range(); 3814 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3815 } 3816 3817 typedef InitExprsTy::iterator iterator; 3818 typedef InitExprsTy::const_iterator const_iterator; 3819 typedef InitExprsTy::reverse_iterator reverse_iterator; 3820 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3821 3822 iterator begin() { return InitExprs.begin(); } 3823 const_iterator begin() const { return InitExprs.begin(); } 3824 iterator end() { return InitExprs.end(); } 3825 const_iterator end() const { return InitExprs.end(); } 3826 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3827 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3828 reverse_iterator rend() { return InitExprs.rend(); } 3829 const_reverse_iterator rend() const { return InitExprs.rend(); } 3830 3831 friend class ASTStmtReader; 3832 friend class ASTStmtWriter; 3833}; 3834 3835/// @brief Represents a C99 designated initializer expression. 3836/// 3837/// A designated initializer expression (C99 6.7.8) contains one or 3838/// more designators (which can be field designators, array 3839/// designators, or GNU array-range designators) followed by an 3840/// expression that initializes the field or element(s) that the 3841/// designators refer to. For example, given: 3842/// 3843/// @code 3844/// struct point { 3845/// double x; 3846/// double y; 3847/// }; 3848/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3849/// @endcode 3850/// 3851/// The InitListExpr contains three DesignatedInitExprs, the first of 3852/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3853/// designators, one array designator for @c [2] followed by one field 3854/// designator for @c .y. The initalization expression will be 1.0. 3855class DesignatedInitExpr : public Expr { 3856public: 3857 /// \brief Forward declaration of the Designator class. 3858 class Designator; 3859 3860private: 3861 /// The location of the '=' or ':' prior to the actual initializer 3862 /// expression. 3863 SourceLocation EqualOrColonLoc; 3864 3865 /// Whether this designated initializer used the GNU deprecated 3866 /// syntax rather than the C99 '=' syntax. 3867 bool GNUSyntax : 1; 3868 3869 /// The number of designators in this initializer expression. 3870 unsigned NumDesignators : 15; 3871 3872 /// The number of subexpressions of this initializer expression, 3873 /// which contains both the initializer and any additional 3874 /// expressions used by array and array-range designators. 3875 unsigned NumSubExprs : 16; 3876 3877 /// \brief The designators in this designated initialization 3878 /// expression. 3879 Designator *Designators; 3880 3881 3882 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3883 const Designator *Designators, 3884 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3885 ArrayRef<Expr*> IndexExprs, Expr *Init); 3886 3887 explicit DesignatedInitExpr(unsigned NumSubExprs) 3888 : Expr(DesignatedInitExprClass, EmptyShell()), 3889 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(0) { } 3890 3891public: 3892 /// A field designator, e.g., ".x". 3893 struct FieldDesignator { 3894 /// Refers to the field that is being initialized. The low bit 3895 /// of this field determines whether this is actually a pointer 3896 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3897 /// initially constructed, a field designator will store an 3898 /// IdentifierInfo*. After semantic analysis has resolved that 3899 /// name, the field designator will instead store a FieldDecl*. 3900 uintptr_t NameOrField; 3901 3902 /// The location of the '.' in the designated initializer. 3903 unsigned DotLoc; 3904 3905 /// The location of the field name in the designated initializer. 3906 unsigned FieldLoc; 3907 }; 3908 3909 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3910 struct ArrayOrRangeDesignator { 3911 /// Location of the first index expression within the designated 3912 /// initializer expression's list of subexpressions. 3913 unsigned Index; 3914 /// The location of the '[' starting the array range designator. 3915 unsigned LBracketLoc; 3916 /// The location of the ellipsis separating the start and end 3917 /// indices. Only valid for GNU array-range designators. 3918 unsigned EllipsisLoc; 3919 /// The location of the ']' terminating the array range designator. 3920 unsigned RBracketLoc; 3921 }; 3922 3923 /// @brief Represents a single C99 designator. 3924 /// 3925 /// @todo This class is infuriatingly similar to clang::Designator, 3926 /// but minor differences (storing indices vs. storing pointers) 3927 /// keep us from reusing it. Try harder, later, to rectify these 3928 /// differences. 3929 class Designator { 3930 /// @brief The kind of designator this describes. 3931 enum { 3932 FieldDesignator, 3933 ArrayDesignator, 3934 ArrayRangeDesignator 3935 } Kind; 3936 3937 union { 3938 /// A field designator, e.g., ".x". 3939 struct FieldDesignator Field; 3940 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3941 struct ArrayOrRangeDesignator ArrayOrRange; 3942 }; 3943 friend class DesignatedInitExpr; 3944 3945 public: 3946 Designator() {} 3947 3948 /// @brief Initializes a field designator. 3949 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3950 SourceLocation FieldLoc) 3951 : Kind(FieldDesignator) { 3952 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3953 Field.DotLoc = DotLoc.getRawEncoding(); 3954 Field.FieldLoc = FieldLoc.getRawEncoding(); 3955 } 3956 3957 /// @brief Initializes an array designator. 3958 Designator(unsigned Index, SourceLocation LBracketLoc, 3959 SourceLocation RBracketLoc) 3960 : Kind(ArrayDesignator) { 3961 ArrayOrRange.Index = Index; 3962 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3963 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3964 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3965 } 3966 3967 /// @brief Initializes a GNU array-range designator. 3968 Designator(unsigned Index, SourceLocation LBracketLoc, 3969 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3970 : Kind(ArrayRangeDesignator) { 3971 ArrayOrRange.Index = Index; 3972 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3973 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3974 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3975 } 3976 3977 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3978 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3979 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3980 3981 IdentifierInfo *getFieldName() const; 3982 3983 FieldDecl *getField() const { 3984 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3985 if (Field.NameOrField & 0x01) 3986 return 0; 3987 else 3988 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3989 } 3990 3991 void setField(FieldDecl *FD) { 3992 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3993 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3994 } 3995 3996 SourceLocation getDotLoc() const { 3997 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3998 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3999 } 4000 4001 SourceLocation getFieldLoc() const { 4002 assert(Kind == FieldDesignator && "Only valid on a field designator"); 4003 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 4004 } 4005 4006 SourceLocation getLBracketLoc() const { 4007 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 4008 "Only valid on an array or array-range designator"); 4009 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 4010 } 4011 4012 SourceLocation getRBracketLoc() const { 4013 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 4014 "Only valid on an array or array-range designator"); 4015 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 4016 } 4017 4018 SourceLocation getEllipsisLoc() const { 4019 assert(Kind == ArrayRangeDesignator && 4020 "Only valid on an array-range designator"); 4021 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 4022 } 4023 4024 unsigned getFirstExprIndex() const { 4025 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 4026 "Only valid on an array or array-range designator"); 4027 return ArrayOrRange.Index; 4028 } 4029 4030 SourceLocation getLocStart() const LLVM_READONLY { 4031 if (Kind == FieldDesignator) 4032 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 4033 else 4034 return getLBracketLoc(); 4035 } 4036 SourceLocation getLocEnd() const LLVM_READONLY { 4037 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 4038 } 4039 SourceRange getSourceRange() const LLVM_READONLY { 4040 return SourceRange(getLocStart(), getLocEnd()); 4041 } 4042 }; 4043 4044 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 4045 unsigned NumDesignators, 4046 ArrayRef<Expr*> IndexExprs, 4047 SourceLocation EqualOrColonLoc, 4048 bool GNUSyntax, Expr *Init); 4049 4050 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 4051 4052 /// @brief Returns the number of designators in this initializer. 4053 unsigned size() const { return NumDesignators; } 4054 4055 // Iterator access to the designators. 4056 typedef Designator *designators_iterator; 4057 designators_iterator designators_begin() { return Designators; } 4058 designators_iterator designators_end() { 4059 return Designators + NumDesignators; 4060 } 4061 4062 typedef const Designator *const_designators_iterator; 4063 const_designators_iterator designators_begin() const { return Designators; } 4064 const_designators_iterator designators_end() const { 4065 return Designators + NumDesignators; 4066 } 4067 4068 typedef std::reverse_iterator<designators_iterator> 4069 reverse_designators_iterator; 4070 reverse_designators_iterator designators_rbegin() { 4071 return reverse_designators_iterator(designators_end()); 4072 } 4073 reverse_designators_iterator designators_rend() { 4074 return reverse_designators_iterator(designators_begin()); 4075 } 4076 4077 typedef std::reverse_iterator<const_designators_iterator> 4078 const_reverse_designators_iterator; 4079 const_reverse_designators_iterator designators_rbegin() const { 4080 return const_reverse_designators_iterator(designators_end()); 4081 } 4082 const_reverse_designators_iterator designators_rend() const { 4083 return const_reverse_designators_iterator(designators_begin()); 4084 } 4085 4086 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 4087 4088 void setDesignators(ASTContext &C, const Designator *Desigs, 4089 unsigned NumDesigs); 4090 4091 Expr *getArrayIndex(const Designator &D) const; 4092 Expr *getArrayRangeStart(const Designator &D) const; 4093 Expr *getArrayRangeEnd(const Designator &D) const; 4094 4095 /// @brief Retrieve the location of the '=' that precedes the 4096 /// initializer value itself, if present. 4097 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 4098 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 4099 4100 /// @brief Determines whether this designated initializer used the 4101 /// deprecated GNU syntax for designated initializers. 4102 bool usesGNUSyntax() const { return GNUSyntax; } 4103 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 4104 4105 /// @brief Retrieve the initializer value. 4106 Expr *getInit() const { 4107 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 4108 } 4109 4110 void setInit(Expr *init) { 4111 *child_begin() = init; 4112 } 4113 4114 /// \brief Retrieve the total number of subexpressions in this 4115 /// designated initializer expression, including the actual 4116 /// initialized value and any expressions that occur within array 4117 /// and array-range designators. 4118 unsigned getNumSubExprs() const { return NumSubExprs; } 4119 4120 Expr *getSubExpr(unsigned Idx) { 4121 assert(Idx < NumSubExprs && "Subscript out of range"); 4122 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 4123 Ptr += sizeof(DesignatedInitExpr); 4124 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 4125 } 4126 4127 void setSubExpr(unsigned Idx, Expr *E) { 4128 assert(Idx < NumSubExprs && "Subscript out of range"); 4129 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 4130 Ptr += sizeof(DesignatedInitExpr); 4131 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 4132 } 4133 4134 /// \brief Replaces the designator at index @p Idx with the series 4135 /// of designators in [First, Last). 4136 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 4137 const Designator *Last); 4138 4139 SourceRange getDesignatorsSourceRange() const; 4140 4141 SourceLocation getLocStart() const LLVM_READONLY; 4142 SourceLocation getLocEnd() const LLVM_READONLY; 4143 4144 static bool classof(const Stmt *T) { 4145 return T->getStmtClass() == DesignatedInitExprClass; 4146 } 4147 4148 // Iterators 4149 child_range children() { 4150 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 4151 return child_range(begin, begin + NumSubExprs); 4152 } 4153}; 4154 4155/// \brief Represents an implicitly-generated value initialization of 4156/// an object of a given type. 4157/// 4158/// Implicit value initializations occur within semantic initializer 4159/// list expressions (InitListExpr) as placeholders for subobject 4160/// initializations not explicitly specified by the user. 4161/// 4162/// \see InitListExpr 4163class ImplicitValueInitExpr : public Expr { 4164public: 4165 explicit ImplicitValueInitExpr(QualType ty) 4166 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 4167 false, false, ty->isInstantiationDependentType(), false) { } 4168 4169 /// \brief Construct an empty implicit value initialization. 4170 explicit ImplicitValueInitExpr(EmptyShell Empty) 4171 : Expr(ImplicitValueInitExprClass, Empty) { } 4172 4173 static bool classof(const Stmt *T) { 4174 return T->getStmtClass() == ImplicitValueInitExprClass; 4175 } 4176 4177 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); } 4178 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); } 4179 4180 // Iterators 4181 child_range children() { return child_range(); } 4182}; 4183 4184 4185class ParenListExpr : public Expr { 4186 Stmt **Exprs; 4187 unsigned NumExprs; 4188 SourceLocation LParenLoc, RParenLoc; 4189 4190public: 4191 ParenListExpr(ASTContext& C, SourceLocation lparenloc, ArrayRef<Expr*> exprs, 4192 SourceLocation rparenloc); 4193 4194 /// \brief Build an empty paren list. 4195 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 4196 4197 unsigned getNumExprs() const { return NumExprs; } 4198 4199 const Expr* getExpr(unsigned Init) const { 4200 assert(Init < getNumExprs() && "Initializer access out of range!"); 4201 return cast_or_null<Expr>(Exprs[Init]); 4202 } 4203 4204 Expr* getExpr(unsigned Init) { 4205 assert(Init < getNumExprs() && "Initializer access out of range!"); 4206 return cast_or_null<Expr>(Exprs[Init]); 4207 } 4208 4209 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 4210 4211 SourceLocation getLParenLoc() const { return LParenLoc; } 4212 SourceLocation getRParenLoc() const { return RParenLoc; } 4213 4214 SourceLocation getLocStart() const LLVM_READONLY { return LParenLoc; } 4215 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4216 4217 static bool classof(const Stmt *T) { 4218 return T->getStmtClass() == ParenListExprClass; 4219 } 4220 4221 // Iterators 4222 child_range children() { 4223 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4224 } 4225 4226 friend class ASTStmtReader; 4227 friend class ASTStmtWriter; 4228}; 4229 4230 4231/// \brief Represents a C11 generic selection. 4232/// 4233/// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4234/// expression, followed by one or more generic associations. Each generic 4235/// association specifies a type name and an expression, or "default" and an 4236/// expression (in which case it is known as a default generic association). 4237/// The type and value of the generic selection are identical to those of its 4238/// result expression, which is defined as the expression in the generic 4239/// association with a type name that is compatible with the type of the 4240/// controlling expression, or the expression in the default generic association 4241/// if no types are compatible. For example: 4242/// 4243/// @code 4244/// _Generic(X, double: 1, float: 2, default: 3) 4245/// @endcode 4246/// 4247/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4248/// or 3 if "hello". 4249/// 4250/// As an extension, generic selections are allowed in C++, where the following 4251/// additional semantics apply: 4252/// 4253/// Any generic selection whose controlling expression is type-dependent or 4254/// which names a dependent type in its association list is result-dependent, 4255/// which means that the choice of result expression is dependent. 4256/// Result-dependent generic associations are both type- and value-dependent. 4257class GenericSelectionExpr : public Expr { 4258 enum { CONTROLLING, END_EXPR }; 4259 TypeSourceInfo **AssocTypes; 4260 Stmt **SubExprs; 4261 unsigned NumAssocs, ResultIndex; 4262 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4263 4264public: 4265 GenericSelectionExpr(ASTContext &Context, 4266 SourceLocation GenericLoc, Expr *ControllingExpr, 4267 ArrayRef<TypeSourceInfo*> AssocTypes, 4268 ArrayRef<Expr*> AssocExprs, 4269 SourceLocation DefaultLoc, SourceLocation RParenLoc, 4270 bool ContainsUnexpandedParameterPack, 4271 unsigned ResultIndex); 4272 4273 /// This constructor is used in the result-dependent case. 4274 GenericSelectionExpr(ASTContext &Context, 4275 SourceLocation GenericLoc, Expr *ControllingExpr, 4276 ArrayRef<TypeSourceInfo*> AssocTypes, 4277 ArrayRef<Expr*> AssocExprs, 4278 SourceLocation DefaultLoc, SourceLocation RParenLoc, 4279 bool ContainsUnexpandedParameterPack); 4280 4281 explicit GenericSelectionExpr(EmptyShell Empty) 4282 : Expr(GenericSelectionExprClass, Empty) { } 4283 4284 unsigned getNumAssocs() const { return NumAssocs; } 4285 4286 SourceLocation getGenericLoc() const { return GenericLoc; } 4287 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4288 SourceLocation getRParenLoc() const { return RParenLoc; } 4289 4290 const Expr *getAssocExpr(unsigned i) const { 4291 return cast<Expr>(SubExprs[END_EXPR+i]); 4292 } 4293 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4294 4295 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4296 return AssocTypes[i]; 4297 } 4298 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4299 4300 QualType getAssocType(unsigned i) const { 4301 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4302 return TS->getType(); 4303 else 4304 return QualType(); 4305 } 4306 4307 const Expr *getControllingExpr() const { 4308 return cast<Expr>(SubExprs[CONTROLLING]); 4309 } 4310 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4311 4312 /// Whether this generic selection is result-dependent. 4313 bool isResultDependent() const { return ResultIndex == -1U; } 4314 4315 /// The zero-based index of the result expression's generic association in 4316 /// the generic selection's association list. Defined only if the 4317 /// generic selection is not result-dependent. 4318 unsigned getResultIndex() const { 4319 assert(!isResultDependent() && "Generic selection is result-dependent"); 4320 return ResultIndex; 4321 } 4322 4323 /// The generic selection's result expression. Defined only if the 4324 /// generic selection is not result-dependent. 4325 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4326 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4327 4328 SourceLocation getLocStart() const LLVM_READONLY { return GenericLoc; } 4329 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4330 4331 static bool classof(const Stmt *T) { 4332 return T->getStmtClass() == GenericSelectionExprClass; 4333 } 4334 4335 child_range children() { 4336 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4337 } 4338 4339 friend class ASTStmtReader; 4340}; 4341 4342//===----------------------------------------------------------------------===// 4343// Clang Extensions 4344//===----------------------------------------------------------------------===// 4345 4346 4347/// ExtVectorElementExpr - This represents access to specific elements of a 4348/// vector, and may occur on the left hand side or right hand side. For example 4349/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4350/// 4351/// Note that the base may have either vector or pointer to vector type, just 4352/// like a struct field reference. 4353/// 4354class ExtVectorElementExpr : public Expr { 4355 Stmt *Base; 4356 IdentifierInfo *Accessor; 4357 SourceLocation AccessorLoc; 4358public: 4359 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4360 IdentifierInfo &accessor, SourceLocation loc) 4361 : Expr(ExtVectorElementExprClass, ty, VK, 4362 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4363 base->isTypeDependent(), base->isValueDependent(), 4364 base->isInstantiationDependent(), 4365 base->containsUnexpandedParameterPack()), 4366 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4367 4368 /// \brief Build an empty vector element expression. 4369 explicit ExtVectorElementExpr(EmptyShell Empty) 4370 : Expr(ExtVectorElementExprClass, Empty) { } 4371 4372 const Expr *getBase() const { return cast<Expr>(Base); } 4373 Expr *getBase() { return cast<Expr>(Base); } 4374 void setBase(Expr *E) { Base = E; } 4375 4376 IdentifierInfo &getAccessor() const { return *Accessor; } 4377 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4378 4379 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4380 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4381 4382 /// getNumElements - Get the number of components being selected. 4383 unsigned getNumElements() const; 4384 4385 /// containsDuplicateElements - Return true if any element access is 4386 /// repeated. 4387 bool containsDuplicateElements() const; 4388 4389 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4390 /// aggregate Constant of ConstantInt(s). 4391 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4392 4393 SourceLocation getLocStart() const LLVM_READONLY { 4394 return getBase()->getLocStart(); 4395 } 4396 SourceLocation getLocEnd() const LLVM_READONLY { return AccessorLoc; } 4397 4398 /// isArrow - Return true if the base expression is a pointer to vector, 4399 /// return false if the base expression is a vector. 4400 bool isArrow() const; 4401 4402 static bool classof(const Stmt *T) { 4403 return T->getStmtClass() == ExtVectorElementExprClass; 4404 } 4405 4406 // Iterators 4407 child_range children() { return child_range(&Base, &Base+1); } 4408}; 4409 4410 4411/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4412/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4413class BlockExpr : public Expr { 4414protected: 4415 BlockDecl *TheBlock; 4416public: 4417 BlockExpr(BlockDecl *BD, QualType ty) 4418 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4419 ty->isDependentType(), ty->isDependentType(), 4420 ty->isInstantiationDependentType() || BD->isDependentContext(), 4421 false), 4422 TheBlock(BD) {} 4423 4424 /// \brief Build an empty block expression. 4425 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4426 4427 const BlockDecl *getBlockDecl() const { return TheBlock; } 4428 BlockDecl *getBlockDecl() { return TheBlock; } 4429 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4430 4431 // Convenience functions for probing the underlying BlockDecl. 4432 SourceLocation getCaretLocation() const; 4433 const Stmt *getBody() const; 4434 Stmt *getBody(); 4435 4436 SourceLocation getLocStart() const LLVM_READONLY { return getCaretLocation(); } 4437 SourceLocation getLocEnd() const LLVM_READONLY { return getBody()->getLocEnd(); } 4438 4439 /// getFunctionType - Return the underlying function type for this block. 4440 const FunctionProtoType *getFunctionType() const; 4441 4442 static bool classof(const Stmt *T) { 4443 return T->getStmtClass() == BlockExprClass; 4444 } 4445 4446 // Iterators 4447 child_range children() { return child_range(); } 4448}; 4449 4450/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4451/// This AST node provides support for reinterpreting a type to another 4452/// type of the same size. 4453class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4454private: 4455 Stmt *SrcExpr; 4456 SourceLocation BuiltinLoc, RParenLoc; 4457 4458 friend class ASTReader; 4459 friend class ASTStmtReader; 4460 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4461 4462public: 4463 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4464 ExprValueKind VK, ExprObjectKind OK, 4465 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4466 : Expr(AsTypeExprClass, DstType, VK, OK, 4467 DstType->isDependentType(), 4468 DstType->isDependentType() || SrcExpr->isValueDependent(), 4469 (DstType->isInstantiationDependentType() || 4470 SrcExpr->isInstantiationDependent()), 4471 (DstType->containsUnexpandedParameterPack() || 4472 SrcExpr->containsUnexpandedParameterPack())), 4473 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4474 4475 /// getSrcExpr - Return the Expr to be converted. 4476 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4477 4478 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4479 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4480 4481 /// getRParenLoc - Return the location of final right parenthesis. 4482 SourceLocation getRParenLoc() const { return RParenLoc; } 4483 4484 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 4485 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4486 4487 static bool classof(const Stmt *T) { 4488 return T->getStmtClass() == AsTypeExprClass; 4489 } 4490 4491 // Iterators 4492 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4493}; 4494 4495/// PseudoObjectExpr - An expression which accesses a pseudo-object 4496/// l-value. A pseudo-object is an abstract object, accesses to which 4497/// are translated to calls. The pseudo-object expression has a 4498/// syntactic form, which shows how the expression was actually 4499/// written in the source code, and a semantic form, which is a series 4500/// of expressions to be executed in order which detail how the 4501/// operation is actually evaluated. Optionally, one of the semantic 4502/// forms may also provide a result value for the expression. 4503/// 4504/// If any of the semantic-form expressions is an OpaqueValueExpr, 4505/// that OVE is required to have a source expression, and it is bound 4506/// to the result of that source expression. Such OVEs may appear 4507/// only in subsequent semantic-form expressions and as 4508/// sub-expressions of the syntactic form. 4509/// 4510/// PseudoObjectExpr should be used only when an operation can be 4511/// usefully described in terms of fairly simple rewrite rules on 4512/// objects and functions that are meant to be used by end-developers. 4513/// For example, under the Itanium ABI, dynamic casts are implemented 4514/// as a call to a runtime function called __dynamic_cast; using this 4515/// class to describe that would be inappropriate because that call is 4516/// not really part of the user-visible semantics, and instead the 4517/// cast is properly reflected in the AST and IR-generation has been 4518/// taught to generate the call as necessary. In contrast, an 4519/// Objective-C property access is semantically defined to be 4520/// equivalent to a particular message send, and this is very much 4521/// part of the user model. The name of this class encourages this 4522/// modelling design. 4523class PseudoObjectExpr : public Expr { 4524 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4525 // Always at least two, because the first sub-expression is the 4526 // syntactic form. 4527 4528 // PseudoObjectExprBits.ResultIndex - The index of the 4529 // sub-expression holding the result. 0 means the result is void, 4530 // which is unambiguous because it's the index of the syntactic 4531 // form. Note that this is therefore 1 higher than the value passed 4532 // in to Create, which is an index within the semantic forms. 4533 // Note also that ASTStmtWriter assumes this encoding. 4534 4535 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); } 4536 const Expr * const *getSubExprsBuffer() const { 4537 return reinterpret_cast<const Expr * const *>(this + 1); 4538 } 4539 4540 friend class ASTStmtReader; 4541 4542 PseudoObjectExpr(QualType type, ExprValueKind VK, 4543 Expr *syntactic, ArrayRef<Expr*> semantic, 4544 unsigned resultIndex); 4545 4546 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4547 4548 unsigned getNumSubExprs() const { 4549 return PseudoObjectExprBits.NumSubExprs; 4550 } 4551 4552public: 4553 /// NoResult - A value for the result index indicating that there is 4554 /// no semantic result. 4555 enum { NoResult = ~0U }; 4556 4557 static PseudoObjectExpr *Create(ASTContext &Context, Expr *syntactic, 4558 ArrayRef<Expr*> semantic, 4559 unsigned resultIndex); 4560 4561 static PseudoObjectExpr *Create(ASTContext &Context, EmptyShell shell, 4562 unsigned numSemanticExprs); 4563 4564 /// Return the syntactic form of this expression, i.e. the 4565 /// expression it actually looks like. Likely to be expressed in 4566 /// terms of OpaqueValueExprs bound in the semantic form. 4567 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 4568 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 4569 4570 /// Return the index of the result-bearing expression into the semantics 4571 /// expressions, or PseudoObjectExpr::NoResult if there is none. 4572 unsigned getResultExprIndex() const { 4573 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 4574 return PseudoObjectExprBits.ResultIndex - 1; 4575 } 4576 4577 /// Return the result-bearing expression, or null if there is none. 4578 Expr *getResultExpr() { 4579 if (PseudoObjectExprBits.ResultIndex == 0) 4580 return 0; 4581 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 4582 } 4583 const Expr *getResultExpr() const { 4584 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 4585 } 4586 4587 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 4588 4589 typedef Expr * const *semantics_iterator; 4590 typedef const Expr * const *const_semantics_iterator; 4591 semantics_iterator semantics_begin() { 4592 return getSubExprsBuffer() + 1; 4593 } 4594 const_semantics_iterator semantics_begin() const { 4595 return getSubExprsBuffer() + 1; 4596 } 4597 semantics_iterator semantics_end() { 4598 return getSubExprsBuffer() + getNumSubExprs(); 4599 } 4600 const_semantics_iterator semantics_end() const { 4601 return getSubExprsBuffer() + getNumSubExprs(); 4602 } 4603 Expr *getSemanticExpr(unsigned index) { 4604 assert(index + 1 < getNumSubExprs()); 4605 return getSubExprsBuffer()[index + 1]; 4606 } 4607 const Expr *getSemanticExpr(unsigned index) const { 4608 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 4609 } 4610 4611 SourceLocation getExprLoc() const LLVM_READONLY { 4612 return getSyntacticForm()->getExprLoc(); 4613 } 4614 4615 SourceLocation getLocStart() const LLVM_READONLY { 4616 return getSyntacticForm()->getLocStart(); 4617 } 4618 SourceLocation getLocEnd() const LLVM_READONLY { 4619 return getSyntacticForm()->getLocEnd(); 4620 } 4621 4622 child_range children() { 4623 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer()); 4624 return child_range(cs, cs + getNumSubExprs()); 4625 } 4626 4627 static bool classof(const Stmt *T) { 4628 return T->getStmtClass() == PseudoObjectExprClass; 4629 } 4630}; 4631 4632/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4633/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4634/// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>. 4635/// All of these instructions take one primary pointer and at least one memory 4636/// order. 4637class AtomicExpr : public Expr { 4638public: 4639 enum AtomicOp { 4640#define BUILTIN(ID, TYPE, ATTRS) 4641#define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID, 4642#include "clang/Basic/Builtins.def" 4643 // Avoid trailing comma 4644 BI_First = 0 4645 }; 4646 4647private: 4648 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR }; 4649 Stmt* SubExprs[END_EXPR]; 4650 unsigned NumSubExprs; 4651 SourceLocation BuiltinLoc, RParenLoc; 4652 AtomicOp Op; 4653 4654 friend class ASTStmtReader; 4655 4656public: 4657 AtomicExpr(SourceLocation BLoc, ArrayRef<Expr*> args, QualType t, 4658 AtomicOp op, SourceLocation RP); 4659 4660 /// \brief Determine the number of arguments the specified atomic builtin 4661 /// should have. 4662 static unsigned getNumSubExprs(AtomicOp Op); 4663 4664 /// \brief Build an empty AtomicExpr. 4665 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4666 4667 Expr *getPtr() const { 4668 return cast<Expr>(SubExprs[PTR]); 4669 } 4670 Expr *getOrder() const { 4671 return cast<Expr>(SubExprs[ORDER]); 4672 } 4673 Expr *getVal1() const { 4674 if (Op == AO__c11_atomic_init) 4675 return cast<Expr>(SubExprs[ORDER]); 4676 assert(NumSubExprs > VAL1); 4677 return cast<Expr>(SubExprs[VAL1]); 4678 } 4679 Expr *getOrderFail() const { 4680 assert(NumSubExprs > ORDER_FAIL); 4681 return cast<Expr>(SubExprs[ORDER_FAIL]); 4682 } 4683 Expr *getVal2() const { 4684 if (Op == AO__atomic_exchange) 4685 return cast<Expr>(SubExprs[ORDER_FAIL]); 4686 assert(NumSubExprs > VAL2); 4687 return cast<Expr>(SubExprs[VAL2]); 4688 } 4689 Expr *getWeak() const { 4690 assert(NumSubExprs > WEAK); 4691 return cast<Expr>(SubExprs[WEAK]); 4692 } 4693 4694 AtomicOp getOp() const { return Op; } 4695 unsigned getNumSubExprs() { return NumSubExprs; } 4696 4697 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4698 4699 bool isVolatile() const { 4700 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4701 } 4702 4703 bool isCmpXChg() const { 4704 return getOp() == AO__c11_atomic_compare_exchange_strong || 4705 getOp() == AO__c11_atomic_compare_exchange_weak || 4706 getOp() == AO__atomic_compare_exchange || 4707 getOp() == AO__atomic_compare_exchange_n; 4708 } 4709 4710 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4711 SourceLocation getRParenLoc() const { return RParenLoc; } 4712 4713 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 4714 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4715 4716 static bool classof(const Stmt *T) { 4717 return T->getStmtClass() == AtomicExprClass; 4718 } 4719 4720 // Iterators 4721 child_range children() { 4722 return child_range(SubExprs, SubExprs+NumSubExprs); 4723 } 4724}; 4725} // end namespace clang 4726 4727#endif 4728