Expr.h revision 3d13c5a1e72ed8f8be9c083791d30643d1b1ec43
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/Stmt.h" 19#include "clang/AST/Type.h" 20#include "clang/AST/DeclAccessPair.h" 21#include "clang/AST/OperationKinds.h" 22#include "clang/AST/ASTVector.h" 23#include "clang/AST/TemplateBase.h" 24#include "clang/Basic/TargetInfo.h" 25#include "clang/Basic/TypeTraits.h" 26#include "llvm/ADT/APSInt.h" 27#include "llvm/ADT/APFloat.h" 28#include "llvm/ADT/SmallVector.h" 29#include "llvm/ADT/StringRef.h" 30#include <cctype> 31 32namespace clang { 33 class ASTContext; 34 class APValue; 35 class Decl; 36 class IdentifierInfo; 37 class ParmVarDecl; 38 class NamedDecl; 39 class ValueDecl; 40 class BlockDecl; 41 class CXXBaseSpecifier; 42 class CXXOperatorCallExpr; 43 class CXXMemberCallExpr; 44 class ObjCPropertyRefExpr; 45 class OpaqueValueExpr; 46 47/// \brief A simple array of base specifiers. 48typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 49 50/// Expr - This represents one expression. Note that Expr's are subclasses of 51/// Stmt. This allows an expression to be transparently used any place a Stmt 52/// is required. 53/// 54class Expr : public Stmt { 55 QualType TR; 56 57protected: 58 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 59 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 60 : Stmt(SC) 61 { 62 ExprBits.TypeDependent = TD; 63 ExprBits.ValueDependent = VD; 64 ExprBits.InstantiationDependent = ID; 65 ExprBits.ValueKind = VK; 66 ExprBits.ObjectKind = OK; 67 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 68 setType(T); 69 } 70 71 /// \brief Construct an empty expression. 72 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 73 74public: 75 QualType getType() const { return TR; } 76 void setType(QualType t) { 77 // In C++, the type of an expression is always adjusted so that it 78 // will not have reference type an expression will never have 79 // reference type (C++ [expr]p6). Use 80 // QualType::getNonReferenceType() to retrieve the non-reference 81 // type. Additionally, inspect Expr::isLvalue to determine whether 82 // an expression that is adjusted in this manner should be 83 // considered an lvalue. 84 assert((t.isNull() || !t->isReferenceType()) && 85 "Expressions can't have reference type"); 86 87 TR = t; 88 } 89 90 /// isValueDependent - Determines whether this expression is 91 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 92 /// array bound of "Chars" in the following example is 93 /// value-dependent. 94 /// @code 95 /// template<int Size, char (&Chars)[Size]> struct meta_string; 96 /// @endcode 97 bool isValueDependent() const { return ExprBits.ValueDependent; } 98 99 /// \brief Set whether this expression is value-dependent or not. 100 void setValueDependent(bool VD) { 101 ExprBits.ValueDependent = VD; 102 if (VD) 103 ExprBits.InstantiationDependent = true; 104 } 105 106 /// isTypeDependent - Determines whether this expression is 107 /// type-dependent (C++ [temp.dep.expr]), which means that its type 108 /// could change from one template instantiation to the next. For 109 /// example, the expressions "x" and "x + y" are type-dependent in 110 /// the following code, but "y" is not type-dependent: 111 /// @code 112 /// template<typename T> 113 /// void add(T x, int y) { 114 /// x + y; 115 /// } 116 /// @endcode 117 bool isTypeDependent() const { return ExprBits.TypeDependent; } 118 119 /// \brief Set whether this expression is type-dependent or not. 120 void setTypeDependent(bool TD) { 121 ExprBits.TypeDependent = TD; 122 if (TD) 123 ExprBits.InstantiationDependent = true; 124 } 125 126 /// \brief Whether this expression is instantiation-dependent, meaning that 127 /// it depends in some way on a template parameter, even if neither its type 128 /// nor (constant) value can change due to the template instantiation. 129 /// 130 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 131 /// instantiation-dependent (since it involves a template parameter \c T), but 132 /// is neither type- nor value-dependent, since the type of the inner 133 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 134 /// \c sizeof is known. 135 /// 136 /// \code 137 /// template<typename T> 138 /// void f(T x, T y) { 139 /// sizeof(sizeof(T() + T()); 140 /// } 141 /// \endcode 142 /// 143 bool isInstantiationDependent() const { 144 return ExprBits.InstantiationDependent; 145 } 146 147 /// \brief Set whether this expression is instantiation-dependent or not. 148 void setInstantiationDependent(bool ID) { 149 ExprBits.InstantiationDependent = ID; 150 } 151 152 /// \brief Whether this expression contains an unexpanded parameter 153 /// pack (for C++0x variadic templates). 154 /// 155 /// Given the following function template: 156 /// 157 /// \code 158 /// template<typename F, typename ...Types> 159 /// void forward(const F &f, Types &&...args) { 160 /// f(static_cast<Types&&>(args)...); 161 /// } 162 /// \endcode 163 /// 164 /// The expressions \c args and \c static_cast<Types&&>(args) both 165 /// contain parameter packs. 166 bool containsUnexpandedParameterPack() const { 167 return ExprBits.ContainsUnexpandedParameterPack; 168 } 169 170 /// \brief Set the bit that describes whether this expression 171 /// contains an unexpanded parameter pack. 172 void setContainsUnexpandedParameterPack(bool PP = true) { 173 ExprBits.ContainsUnexpandedParameterPack = PP; 174 } 175 176 /// getExprLoc - Return the preferred location for the arrow when diagnosing 177 /// a problem with a generic expression. 178 SourceLocation getExprLoc() const; 179 180 /// isUnusedResultAWarning - Return true if this immediate expression should 181 /// be warned about if the result is unused. If so, fill in Loc and Ranges 182 /// with location to warn on and the source range[s] to report with the 183 /// warning. 184 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 185 SourceRange &R2, ASTContext &Ctx) const; 186 187 /// isLValue - True if this expression is an "l-value" according to 188 /// the rules of the current language. C and C++ give somewhat 189 /// different rules for this concept, but in general, the result of 190 /// an l-value expression identifies a specific object whereas the 191 /// result of an r-value expression is a value detached from any 192 /// specific storage. 193 /// 194 /// C++0x divides the concept of "r-value" into pure r-values 195 /// ("pr-values") and so-called expiring values ("x-values"), which 196 /// identify specific objects that can be safely cannibalized for 197 /// their resources. This is an unfortunate abuse of terminology on 198 /// the part of the C++ committee. In Clang, when we say "r-value", 199 /// we generally mean a pr-value. 200 bool isLValue() const { return getValueKind() == VK_LValue; } 201 bool isRValue() const { return getValueKind() == VK_RValue; } 202 bool isXValue() const { return getValueKind() == VK_XValue; } 203 bool isGLValue() const { return getValueKind() != VK_RValue; } 204 205 enum LValueClassification { 206 LV_Valid, 207 LV_NotObjectType, 208 LV_IncompleteVoidType, 209 LV_DuplicateVectorComponents, 210 LV_InvalidExpression, 211 LV_InvalidMessageExpression, 212 LV_MemberFunction, 213 LV_SubObjCPropertySetting, 214 LV_ClassTemporary 215 }; 216 /// Reasons why an expression might not be an l-value. 217 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 218 219 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 220 /// does not have an incomplete type, does not have a const-qualified type, 221 /// and if it is a structure or union, does not have any member (including, 222 /// recursively, any member or element of all contained aggregates or unions) 223 /// with a const-qualified type. 224 /// 225 /// \param Loc [in] [out] - A source location which *may* be filled 226 /// in with the location of the expression making this a 227 /// non-modifiable lvalue, if specified. 228 enum isModifiableLvalueResult { 229 MLV_Valid, 230 MLV_NotObjectType, 231 MLV_IncompleteVoidType, 232 MLV_DuplicateVectorComponents, 233 MLV_InvalidExpression, 234 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 235 MLV_IncompleteType, 236 MLV_ConstQualified, 237 MLV_ArrayType, 238 MLV_NotBlockQualified, 239 MLV_ReadonlyProperty, 240 MLV_NoSetterProperty, 241 MLV_MemberFunction, 242 MLV_SubObjCPropertySetting, 243 MLV_InvalidMessageExpression, 244 MLV_ClassTemporary 245 }; 246 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 247 SourceLocation *Loc = 0) const; 248 249 /// \brief The return type of classify(). Represents the C++0x expression 250 /// taxonomy. 251 class Classification { 252 public: 253 /// \brief The various classification results. Most of these mean prvalue. 254 enum Kinds { 255 CL_LValue, 256 CL_XValue, 257 CL_Function, // Functions cannot be lvalues in C. 258 CL_Void, // Void cannot be an lvalue in C. 259 CL_AddressableVoid, // Void expression whose address can be taken in C. 260 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 261 CL_MemberFunction, // An expression referring to a member function 262 CL_SubObjCPropertySetting, 263 CL_ClassTemporary, // A prvalue of class type 264 CL_ObjCMessageRValue, // ObjC message is an rvalue 265 CL_PRValue // A prvalue for any other reason, of any other type 266 }; 267 /// \brief The results of modification testing. 268 enum ModifiableType { 269 CM_Untested, // testModifiable was false. 270 CM_Modifiable, 271 CM_RValue, // Not modifiable because it's an rvalue 272 CM_Function, // Not modifiable because it's a function; C++ only 273 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 274 CM_NotBlockQualified, // Not captured in the closure 275 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 276 CM_ConstQualified, 277 CM_ArrayType, 278 CM_IncompleteType 279 }; 280 281 private: 282 friend class Expr; 283 284 unsigned short Kind; 285 unsigned short Modifiable; 286 287 explicit Classification(Kinds k, ModifiableType m) 288 : Kind(k), Modifiable(m) 289 {} 290 291 public: 292 Classification() {} 293 294 Kinds getKind() const { return static_cast<Kinds>(Kind); } 295 ModifiableType getModifiable() const { 296 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 297 return static_cast<ModifiableType>(Modifiable); 298 } 299 bool isLValue() const { return Kind == CL_LValue; } 300 bool isXValue() const { return Kind == CL_XValue; } 301 bool isGLValue() const { return Kind <= CL_XValue; } 302 bool isPRValue() const { return Kind >= CL_Function; } 303 bool isRValue() const { return Kind >= CL_XValue; } 304 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 305 306 /// \brief Create a simple, modifiably lvalue 307 static Classification makeSimpleLValue() { 308 return Classification(CL_LValue, CM_Modifiable); 309 } 310 311 }; 312 /// \brief Classify - Classify this expression according to the C++0x 313 /// expression taxonomy. 314 /// 315 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 316 /// old lvalue vs rvalue. This function determines the type of expression this 317 /// is. There are three expression types: 318 /// - lvalues are classical lvalues as in C++03. 319 /// - prvalues are equivalent to rvalues in C++03. 320 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 321 /// function returning an rvalue reference. 322 /// lvalues and xvalues are collectively referred to as glvalues, while 323 /// prvalues and xvalues together form rvalues. 324 Classification Classify(ASTContext &Ctx) const { 325 return ClassifyImpl(Ctx, 0); 326 } 327 328 /// \brief ClassifyModifiable - Classify this expression according to the 329 /// C++0x expression taxonomy, and see if it is valid on the left side 330 /// of an assignment. 331 /// 332 /// This function extends classify in that it also tests whether the 333 /// expression is modifiable (C99 6.3.2.1p1). 334 /// \param Loc A source location that might be filled with a relevant location 335 /// if the expression is not modifiable. 336 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 337 return ClassifyImpl(Ctx, &Loc); 338 } 339 340 /// getValueKindForType - Given a formal return or parameter type, 341 /// give its value kind. 342 static ExprValueKind getValueKindForType(QualType T) { 343 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 344 return (isa<LValueReferenceType>(RT) 345 ? VK_LValue 346 : (RT->getPointeeType()->isFunctionType() 347 ? VK_LValue : VK_XValue)); 348 return VK_RValue; 349 } 350 351 /// getValueKind - The value kind that this expression produces. 352 ExprValueKind getValueKind() const { 353 return static_cast<ExprValueKind>(ExprBits.ValueKind); 354 } 355 356 /// getObjectKind - The object kind that this expression produces. 357 /// Object kinds are meaningful only for expressions that yield an 358 /// l-value or x-value. 359 ExprObjectKind getObjectKind() const { 360 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 361 } 362 363 bool isOrdinaryOrBitFieldObject() const { 364 ExprObjectKind OK = getObjectKind(); 365 return (OK == OK_Ordinary || OK == OK_BitField); 366 } 367 368 /// setValueKind - Set the value kind produced by this expression. 369 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 370 371 /// setObjectKind - Set the object kind produced by this expression. 372 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 373 374private: 375 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 376 377public: 378 379 /// \brief If this expression refers to a bit-field, retrieve the 380 /// declaration of that bit-field. 381 FieldDecl *getBitField(); 382 383 const FieldDecl *getBitField() const { 384 return const_cast<Expr*>(this)->getBitField(); 385 } 386 387 /// \brief If this expression is an l-value for an Objective C 388 /// property, find the underlying property reference expression. 389 const ObjCPropertyRefExpr *getObjCProperty() const; 390 391 /// \brief Returns whether this expression refers to a vector element. 392 bool refersToVectorElement() const; 393 394 /// \brief Returns whether this expression has a placeholder type. 395 bool hasPlaceholderType() const { 396 return getType()->isPlaceholderType(); 397 } 398 399 /// \brief Returns whether this expression has a specific placeholder type. 400 bool hasPlaceholderType(BuiltinType::Kind K) const { 401 assert(BuiltinType::isPlaceholderTypeKind(K)); 402 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 403 return BT->getKind() == K; 404 return false; 405 } 406 407 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 408 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 409 /// but also int expressions which are produced by things like comparisons in 410 /// C. 411 bool isKnownToHaveBooleanValue() const; 412 413 /// isIntegerConstantExpr - Return true if this expression is a valid integer 414 /// constant expression, and, if so, return its value in Result. If not a 415 /// valid i-c-e, return false and fill in Loc (if specified) with the location 416 /// of the invalid expression. 417 /// 418 /// Note: This does not perform the implicit conversions required by C++11 419 /// [expr.const]p5. 420 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 421 SourceLocation *Loc = 0, 422 bool isEvaluated = true) const; 423 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const; 424 425 /// isCXX98IntegralConstantExpr - Return true if this expression is an 426 /// integral constant expression in C++98. Can only be used in C++. 427 bool isCXX98IntegralConstantExpr(ASTContext &Ctx) const; 428 429 /// isCXX11ConstantExpr - Return true if this expression is a constant 430 /// expression in C++11. Can only be used in C++. 431 /// 432 /// Note: This does not perform the implicit conversions required by C++11 433 /// [expr.const]p5. 434 bool isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result = 0, 435 SourceLocation *Loc = 0) const; 436 437 /// isPotentialConstantExpr - Return true if this function's definition 438 /// might be usable in a constant expression in C++11, if it were marked 439 /// constexpr. Return false if the function can never produce a constant 440 /// expression, along with diagnostics describing why not. 441 static bool isPotentialConstantExpr(const FunctionDecl *FD, 442 llvm::SmallVectorImpl< 443 PartialDiagnosticAt> &Diags); 444 445 /// isConstantInitializer - Returns true if this expression can be emitted to 446 /// IR as a constant, and thus can be used as a constant initializer in C. 447 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 448 449 /// EvalStatus is a struct with detailed info about an evaluation in progress. 450 struct EvalStatus { 451 /// HasSideEffects - Whether the evaluated expression has side effects. 452 /// For example, (f() && 0) can be folded, but it still has side effects. 453 bool HasSideEffects; 454 455 /// Diag - If this is non-null, it will be filled in with a stack of notes 456 /// indicating why evaluation failed (or why it failed to produce a constant 457 /// expression). 458 /// If the expression is unfoldable, the notes will indicate why it's not 459 /// foldable. If the expression is foldable, but not a constant expression, 460 /// the notes will describes why it isn't a constant expression. If the 461 /// expression *is* a constant expression, no notes will be produced. 462 llvm::SmallVectorImpl<PartialDiagnosticAt> *Diag; 463 464 EvalStatus() : HasSideEffects(false), Diag(0) {} 465 466 // hasSideEffects - Return true if the evaluated expression has 467 // side effects. 468 bool hasSideEffects() const { 469 return HasSideEffects; 470 } 471 }; 472 473 /// EvalResult is a struct with detailed info about an evaluated expression. 474 struct EvalResult : EvalStatus { 475 /// Val - This is the value the expression can be folded to. 476 APValue Val; 477 478 // isGlobalLValue - Return true if the evaluated lvalue expression 479 // is global. 480 bool isGlobalLValue() const; 481 }; 482 483 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 484 /// an rvalue using any crazy technique (that has nothing to do with language 485 /// standards) that we want to, even if the expression has side-effects. If 486 /// this function returns true, it returns the folded constant in Result. If 487 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 488 /// applied. 489 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 490 491 /// EvaluateAsBooleanCondition - Return true if this is a constant 492 /// which we we can fold and convert to a boolean condition using 493 /// any crazy technique that we want to, even if the expression has 494 /// side-effects. 495 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 496 497 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects }; 498 499 /// EvaluateAsInt - Return true if this is a constant which we can fold and 500 /// convert to an integer, using any crazy technique that we want to. 501 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 502 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 503 504 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 505 /// constant folded without side-effects, but discard the result. 506 bool isEvaluatable(const ASTContext &Ctx) const; 507 508 /// HasSideEffects - This routine returns true for all those expressions 509 /// which must be evaluated each time and must not be optimized away 510 /// or evaluated at compile time. Example is a function call, volatile 511 /// variable read. 512 bool HasSideEffects(const ASTContext &Ctx) const; 513 514 /// \brief Determine whether this expression involves a call to any function 515 /// that is not trivial. 516 bool hasNonTrivialCall(ASTContext &Ctx); 517 518 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 519 /// integer. This must be called on an expression that constant folds to an 520 /// integer. 521 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 522 523 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 524 /// lvalue with link time known address, with no side-effects. 525 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 526 527 /// EvaluateAsInitializer - Evaluate an expression as if it were the 528 /// initializer of the given declaration. Returns true if the initializer 529 /// can be folded to a constant, and produces any relevant notes. In C++11, 530 /// notes will be produced if the expression is not a constant expression. 531 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 532 const VarDecl *VD, 533 llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 534 535 /// \brief Enumeration used to describe the kind of Null pointer constant 536 /// returned from \c isNullPointerConstant(). 537 enum NullPointerConstantKind { 538 /// \brief Expression is not a Null pointer constant. 539 NPCK_NotNull = 0, 540 541 /// \brief Expression is a Null pointer constant built from a zero integer. 542 NPCK_ZeroInteger, 543 544 /// \brief Expression is a C++0X nullptr. 545 NPCK_CXX0X_nullptr, 546 547 /// \brief Expression is a GNU-style __null constant. 548 NPCK_GNUNull 549 }; 550 551 /// \brief Enumeration used to describe how \c isNullPointerConstant() 552 /// should cope with value-dependent expressions. 553 enum NullPointerConstantValueDependence { 554 /// \brief Specifies that the expression should never be value-dependent. 555 NPC_NeverValueDependent = 0, 556 557 /// \brief Specifies that a value-dependent expression of integral or 558 /// dependent type should be considered a null pointer constant. 559 NPC_ValueDependentIsNull, 560 561 /// \brief Specifies that a value-dependent expression should be considered 562 /// to never be a null pointer constant. 563 NPC_ValueDependentIsNotNull 564 }; 565 566 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 567 /// a Null pointer constant. The return value can further distinguish the 568 /// kind of NULL pointer constant that was detected. 569 NullPointerConstantKind isNullPointerConstant( 570 ASTContext &Ctx, 571 NullPointerConstantValueDependence NPC) const; 572 573 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 574 /// write barrier. 575 bool isOBJCGCCandidate(ASTContext &Ctx) const; 576 577 /// \brief Returns true if this expression is a bound member function. 578 bool isBoundMemberFunction(ASTContext &Ctx) const; 579 580 /// \brief Given an expression of bound-member type, find the type 581 /// of the member. Returns null if this is an *overloaded* bound 582 /// member expression. 583 static QualType findBoundMemberType(const Expr *expr); 584 585 /// \brief Result type of CanThrow(). 586 enum CanThrowResult { 587 CT_Cannot, 588 CT_Dependent, 589 CT_Can 590 }; 591 /// \brief Test if this expression, if evaluated, might throw, according to 592 /// the rules of C++ [expr.unary.noexcept]. 593 CanThrowResult CanThrow(ASTContext &C) const; 594 595 /// IgnoreImpCasts - Skip past any implicit casts which might 596 /// surround this expression. Only skips ImplicitCastExprs. 597 Expr *IgnoreImpCasts(); 598 599 /// IgnoreImplicit - Skip past any implicit AST nodes which might 600 /// surround this expression. 601 Expr *IgnoreImplicit() { return cast<Expr>(Stmt::IgnoreImplicit()); } 602 603 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 604 /// its subexpression. If that subexpression is also a ParenExpr, 605 /// then this method recursively returns its subexpression, and so forth. 606 /// Otherwise, the method returns the current Expr. 607 Expr *IgnoreParens(); 608 609 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 610 /// or CastExprs, returning their operand. 611 Expr *IgnoreParenCasts(); 612 613 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 614 /// any ParenExpr or ImplicitCastExprs, returning their operand. 615 Expr *IgnoreParenImpCasts(); 616 617 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 618 /// call to a conversion operator, return the argument. 619 Expr *IgnoreConversionOperator(); 620 621 const Expr *IgnoreConversionOperator() const { 622 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 623 } 624 625 const Expr *IgnoreParenImpCasts() const { 626 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 627 } 628 629 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 630 /// CastExprs that represent lvalue casts, returning their operand. 631 Expr *IgnoreParenLValueCasts(); 632 633 const Expr *IgnoreParenLValueCasts() const { 634 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 635 } 636 637 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 638 /// value (including ptr->int casts of the same size). Strip off any 639 /// ParenExpr or CastExprs, returning their operand. 640 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 641 642 /// \brief Determine whether this expression is a default function argument. 643 /// 644 /// Default arguments are implicitly generated in the abstract syntax tree 645 /// by semantic analysis for function calls, object constructions, etc. in 646 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 647 /// this routine also looks through any implicit casts to determine whether 648 /// the expression is a default argument. 649 bool isDefaultArgument() const; 650 651 /// \brief Determine whether the result of this expression is a 652 /// temporary object of the given class type. 653 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 654 655 /// \brief Whether this expression is an implicit reference to 'this' in C++. 656 bool isImplicitCXXThis() const; 657 658 const Expr *IgnoreImpCasts() const { 659 return const_cast<Expr*>(this)->IgnoreImpCasts(); 660 } 661 const Expr *IgnoreParens() const { 662 return const_cast<Expr*>(this)->IgnoreParens(); 663 } 664 const Expr *IgnoreParenCasts() const { 665 return const_cast<Expr*>(this)->IgnoreParenCasts(); 666 } 667 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 668 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 669 } 670 671 static bool hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs); 672 673 static bool classof(const Stmt *T) { 674 return T->getStmtClass() >= firstExprConstant && 675 T->getStmtClass() <= lastExprConstant; 676 } 677 static bool classof(const Expr *) { return true; } 678}; 679 680 681//===----------------------------------------------------------------------===// 682// Primary Expressions. 683//===----------------------------------------------------------------------===// 684 685/// OpaqueValueExpr - An expression referring to an opaque object of a 686/// fixed type and value class. These don't correspond to concrete 687/// syntax; instead they're used to express operations (usually copy 688/// operations) on values whose source is generally obvious from 689/// context. 690class OpaqueValueExpr : public Expr { 691 friend class ASTStmtReader; 692 Expr *SourceExpr; 693 SourceLocation Loc; 694 695public: 696 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 697 ExprObjectKind OK = OK_Ordinary, 698 Expr *SourceExpr = 0) 699 : Expr(OpaqueValueExprClass, T, VK, OK, 700 T->isDependentType(), 701 T->isDependentType() || 702 (SourceExpr && SourceExpr->isValueDependent()), 703 T->isInstantiationDependentType(), 704 false), 705 SourceExpr(SourceExpr), Loc(Loc) { 706 } 707 708 /// Given an expression which invokes a copy constructor --- i.e. a 709 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 710 /// find the OpaqueValueExpr that's the source of the construction. 711 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 712 713 explicit OpaqueValueExpr(EmptyShell Empty) 714 : Expr(OpaqueValueExprClass, Empty) { } 715 716 /// \brief Retrieve the location of this expression. 717 SourceLocation getLocation() const { return Loc; } 718 719 SourceRange getSourceRange() const { 720 if (SourceExpr) return SourceExpr->getSourceRange(); 721 return Loc; 722 } 723 SourceLocation getExprLoc() const { 724 if (SourceExpr) return SourceExpr->getExprLoc(); 725 return Loc; 726 } 727 728 child_range children() { return child_range(); } 729 730 /// The source expression of an opaque value expression is the 731 /// expression which originally generated the value. This is 732 /// provided as a convenience for analyses that don't wish to 733 /// precisely model the execution behavior of the program. 734 /// 735 /// The source expression is typically set when building the 736 /// expression which binds the opaque value expression in the first 737 /// place. 738 Expr *getSourceExpr() const { return SourceExpr; } 739 740 static bool classof(const Stmt *T) { 741 return T->getStmtClass() == OpaqueValueExprClass; 742 } 743 static bool classof(const OpaqueValueExpr *) { return true; } 744}; 745 746/// \brief A reference to a declared variable, function, enum, etc. 747/// [C99 6.5.1p2] 748/// 749/// This encodes all the information about how a declaration is referenced 750/// within an expression. 751/// 752/// There are several optional constructs attached to DeclRefExprs only when 753/// they apply in order to conserve memory. These are laid out past the end of 754/// the object, and flags in the DeclRefExprBitfield track whether they exist: 755/// 756/// DeclRefExprBits.HasQualifier: 757/// Specifies when this declaration reference expression has a C++ 758/// nested-name-specifier. 759/// DeclRefExprBits.HasFoundDecl: 760/// Specifies when this declaration reference expression has a record of 761/// a NamedDecl (different from the referenced ValueDecl) which was found 762/// during name lookup and/or overload resolution. 763/// DeclRefExprBits.HasTemplateKWAndArgsInfo: 764/// Specifies when this declaration reference expression has an explicit 765/// C++ template keyword and/or template argument list. 766class DeclRefExpr : public Expr { 767 /// \brief The declaration that we are referencing. 768 ValueDecl *D; 769 770 /// \brief The location of the declaration name itself. 771 SourceLocation Loc; 772 773 /// \brief Provides source/type location info for the declaration name 774 /// embedded in D. 775 DeclarationNameLoc DNLoc; 776 777 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 778 NestedNameSpecifierLoc &getInternalQualifierLoc() { 779 assert(hasQualifier()); 780 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 781 } 782 783 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 784 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 785 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 786 } 787 788 /// \brief Test whether there is a distinct FoundDecl attached to the end of 789 /// this DRE. 790 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 791 792 /// \brief Helper to retrieve the optional NamedDecl through which this 793 /// reference occured. 794 NamedDecl *&getInternalFoundDecl() { 795 assert(hasFoundDecl()); 796 if (hasQualifier()) 797 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 798 return *reinterpret_cast<NamedDecl **>(this + 1); 799 } 800 801 /// \brief Helper to retrieve the optional NamedDecl through which this 802 /// reference occured. 803 NamedDecl *getInternalFoundDecl() const { 804 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 805 } 806 807 DeclRefExpr(ASTContext &Ctx, 808 NestedNameSpecifierLoc QualifierLoc, 809 SourceLocation TemplateKWLoc, 810 ValueDecl *D, const DeclarationNameInfo &NameInfo, 811 NamedDecl *FoundD, 812 const TemplateArgumentListInfo *TemplateArgs, 813 QualType T, ExprValueKind VK); 814 815 /// \brief Construct an empty declaration reference expression. 816 explicit DeclRefExpr(EmptyShell Empty) 817 : Expr(DeclRefExprClass, Empty) { } 818 819 /// \brief Computes the type- and value-dependence flags for this 820 /// declaration reference expression. 821 void computeDependence(ASTContext &C); 822 823public: 824 DeclRefExpr(ValueDecl *D, QualType T, ExprValueKind VK, SourceLocation L, 825 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 826 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 827 D(D), Loc(L), DNLoc(LocInfo) { 828 DeclRefExprBits.HasQualifier = 0; 829 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 830 DeclRefExprBits.HasFoundDecl = 0; 831 DeclRefExprBits.HadMultipleCandidates = 0; 832 computeDependence(D->getASTContext()); 833 } 834 835 static DeclRefExpr *Create(ASTContext &Context, 836 NestedNameSpecifierLoc QualifierLoc, 837 SourceLocation TemplateKWLoc, 838 ValueDecl *D, 839 SourceLocation NameLoc, 840 QualType T, ExprValueKind VK, 841 NamedDecl *FoundD = 0, 842 const TemplateArgumentListInfo *TemplateArgs = 0); 843 844 static DeclRefExpr *Create(ASTContext &Context, 845 NestedNameSpecifierLoc QualifierLoc, 846 SourceLocation TemplateKWLoc, 847 ValueDecl *D, 848 const DeclarationNameInfo &NameInfo, 849 QualType T, ExprValueKind VK, 850 NamedDecl *FoundD = 0, 851 const TemplateArgumentListInfo *TemplateArgs = 0); 852 853 /// \brief Construct an empty declaration reference expression. 854 static DeclRefExpr *CreateEmpty(ASTContext &Context, 855 bool HasQualifier, 856 bool HasFoundDecl, 857 bool HasTemplateKWAndArgsInfo, 858 unsigned NumTemplateArgs); 859 860 ValueDecl *getDecl() { return D; } 861 const ValueDecl *getDecl() const { return D; } 862 void setDecl(ValueDecl *NewD) { D = NewD; } 863 864 DeclarationNameInfo getNameInfo() const { 865 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 866 } 867 868 SourceLocation getLocation() const { return Loc; } 869 void setLocation(SourceLocation L) { Loc = L; } 870 SourceRange getSourceRange() const; 871 872 /// \brief Determine whether this declaration reference was preceded by a 873 /// C++ nested-name-specifier, e.g., \c N::foo. 874 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 875 876 /// \brief If the name was qualified, retrieves the nested-name-specifier 877 /// that precedes the name. Otherwise, returns NULL. 878 NestedNameSpecifier *getQualifier() const { 879 if (!hasQualifier()) 880 return 0; 881 882 return getInternalQualifierLoc().getNestedNameSpecifier(); 883 } 884 885 /// \brief If the name was qualified, retrieves the nested-name-specifier 886 /// that precedes the name, with source-location information. 887 NestedNameSpecifierLoc getQualifierLoc() const { 888 if (!hasQualifier()) 889 return NestedNameSpecifierLoc(); 890 891 return getInternalQualifierLoc(); 892 } 893 894 /// \brief Get the NamedDecl through which this reference occured. 895 /// 896 /// This Decl may be different from the ValueDecl actually referred to in the 897 /// presence of using declarations, etc. It always returns non-NULL, and may 898 /// simple return the ValueDecl when appropriate. 899 NamedDecl *getFoundDecl() { 900 return hasFoundDecl() ? getInternalFoundDecl() : D; 901 } 902 903 /// \brief Get the NamedDecl through which this reference occurred. 904 /// See non-const variant. 905 const NamedDecl *getFoundDecl() const { 906 return hasFoundDecl() ? getInternalFoundDecl() : D; 907 } 908 909 bool hasTemplateKWAndArgsInfo() const { 910 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 911 } 912 913 /// \brief Return the optional template keyword and arguments info. 914 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 915 if (!hasTemplateKWAndArgsInfo()) 916 return 0; 917 918 if (hasFoundDecl()) 919 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 920 &getInternalFoundDecl() + 1); 921 922 if (hasQualifier()) 923 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 924 &getInternalQualifierLoc() + 1); 925 926 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 927 } 928 929 /// \brief Return the optional template keyword and arguments info. 930 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 931 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo(); 932 } 933 934 /// \brief Retrieve the location of the template keyword preceding 935 /// this name, if any. 936 SourceLocation getTemplateKeywordLoc() const { 937 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 938 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 939 } 940 941 /// \brief Retrieve the location of the left angle bracket starting the 942 /// explicit template argument list following the name, if any. 943 SourceLocation getLAngleLoc() const { 944 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 945 return getTemplateKWAndArgsInfo()->LAngleLoc; 946 } 947 948 /// \brief Retrieve the location of the right angle bracket ending the 949 /// explicit template argument list following the name, if any. 950 SourceLocation getRAngleLoc() const { 951 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 952 return getTemplateKWAndArgsInfo()->RAngleLoc; 953 } 954 955 /// \brief Determines whether the name in this declaration reference 956 /// was preceded by the template keyword. 957 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 958 959 /// \brief Determines whether this declaration reference was followed by an 960 /// explicit template argument list. 961 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 962 963 /// \brief Retrieve the explicit template argument list that followed the 964 /// member template name. 965 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 966 assert(hasExplicitTemplateArgs()); 967 return *getTemplateKWAndArgsInfo(); 968 } 969 970 /// \brief Retrieve the explicit template argument list that followed the 971 /// member template name. 972 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 973 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 974 } 975 976 /// \brief Retrieves the optional explicit template arguments. 977 /// This points to the same data as getExplicitTemplateArgs(), but 978 /// returns null if there are no explicit template arguments. 979 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 980 if (!hasExplicitTemplateArgs()) return 0; 981 return &getExplicitTemplateArgs(); 982 } 983 984 /// \brief Copies the template arguments (if present) into the given 985 /// structure. 986 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 987 if (hasExplicitTemplateArgs()) 988 getExplicitTemplateArgs().copyInto(List); 989 } 990 991 /// \brief Retrieve the template arguments provided as part of this 992 /// template-id. 993 const TemplateArgumentLoc *getTemplateArgs() const { 994 if (!hasExplicitTemplateArgs()) 995 return 0; 996 997 return getExplicitTemplateArgs().getTemplateArgs(); 998 } 999 1000 /// \brief Retrieve the number of template arguments provided as part of this 1001 /// template-id. 1002 unsigned getNumTemplateArgs() const { 1003 if (!hasExplicitTemplateArgs()) 1004 return 0; 1005 1006 return getExplicitTemplateArgs().NumTemplateArgs; 1007 } 1008 1009 /// \brief Returns true if this expression refers to a function that 1010 /// was resolved from an overloaded set having size greater than 1. 1011 bool hadMultipleCandidates() const { 1012 return DeclRefExprBits.HadMultipleCandidates; 1013 } 1014 /// \brief Sets the flag telling whether this expression refers to 1015 /// a function that was resolved from an overloaded set having size 1016 /// greater than 1. 1017 void setHadMultipleCandidates(bool V = true) { 1018 DeclRefExprBits.HadMultipleCandidates = V; 1019 } 1020 1021 static bool classof(const Stmt *T) { 1022 return T->getStmtClass() == DeclRefExprClass; 1023 } 1024 static bool classof(const DeclRefExpr *) { return true; } 1025 1026 // Iterators 1027 child_range children() { return child_range(); } 1028 1029 friend class ASTStmtReader; 1030 friend class ASTStmtWriter; 1031}; 1032 1033/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 1034class PredefinedExpr : public Expr { 1035public: 1036 enum IdentType { 1037 Func, 1038 Function, 1039 PrettyFunction, 1040 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 1041 /// 'virtual' keyword is omitted for virtual member functions. 1042 PrettyFunctionNoVirtual 1043 }; 1044 1045private: 1046 SourceLocation Loc; 1047 IdentType Type; 1048public: 1049 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 1050 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 1051 type->isDependentType(), type->isDependentType(), 1052 type->isInstantiationDependentType(), 1053 /*ContainsUnexpandedParameterPack=*/false), 1054 Loc(l), Type(IT) {} 1055 1056 /// \brief Construct an empty predefined expression. 1057 explicit PredefinedExpr(EmptyShell Empty) 1058 : Expr(PredefinedExprClass, Empty) { } 1059 1060 IdentType getIdentType() const { return Type; } 1061 void setIdentType(IdentType IT) { Type = IT; } 1062 1063 SourceLocation getLocation() const { return Loc; } 1064 void setLocation(SourceLocation L) { Loc = L; } 1065 1066 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1067 1068 SourceRange getSourceRange() const { return SourceRange(Loc); } 1069 1070 static bool classof(const Stmt *T) { 1071 return T->getStmtClass() == PredefinedExprClass; 1072 } 1073 static bool classof(const PredefinedExpr *) { return true; } 1074 1075 // Iterators 1076 child_range children() { return child_range(); } 1077}; 1078 1079/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1080/// leaking memory. 1081/// 1082/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1083/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1084/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1085/// the APFloat/APInt values will never get freed. APNumericStorage uses 1086/// ASTContext's allocator for memory allocation. 1087class APNumericStorage { 1088 union { 1089 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1090 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1091 }; 1092 unsigned BitWidth; 1093 1094 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1095 1096 APNumericStorage(const APNumericStorage&); // do not implement 1097 APNumericStorage& operator=(const APNumericStorage&); // do not implement 1098 1099protected: 1100 APNumericStorage() : VAL(0), BitWidth(0) { } 1101 1102 llvm::APInt getIntValue() const { 1103 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1104 if (NumWords > 1) 1105 return llvm::APInt(BitWidth, NumWords, pVal); 1106 else 1107 return llvm::APInt(BitWidth, VAL); 1108 } 1109 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1110}; 1111 1112class APIntStorage : private APNumericStorage { 1113public: 1114 llvm::APInt getValue() const { return getIntValue(); } 1115 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1116}; 1117 1118class APFloatStorage : private APNumericStorage { 1119public: 1120 llvm::APFloat getValue(bool IsIEEE) const { 1121 return llvm::APFloat(getIntValue(), IsIEEE); 1122 } 1123 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1124 setIntValue(C, Val.bitcastToAPInt()); 1125 } 1126}; 1127 1128class IntegerLiteral : public Expr, public APIntStorage { 1129 SourceLocation Loc; 1130 1131 /// \brief Construct an empty integer literal. 1132 explicit IntegerLiteral(EmptyShell Empty) 1133 : Expr(IntegerLiteralClass, Empty) { } 1134 1135public: 1136 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1137 // or UnsignedLongLongTy 1138 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 1139 QualType type, SourceLocation l) 1140 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1141 false, false), 1142 Loc(l) { 1143 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 1144 assert(V.getBitWidth() == C.getIntWidth(type) && 1145 "Integer type is not the correct size for constant."); 1146 setValue(C, V); 1147 } 1148 1149 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1150 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1151 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1152 /// \param V - the value that the returned integer literal contains. 1153 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1154 QualType type, SourceLocation l); 1155 /// \brief Returns a new empty integer literal. 1156 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1157 1158 SourceRange getSourceRange() const { return SourceRange(Loc); } 1159 1160 /// \brief Retrieve the location of the literal. 1161 SourceLocation getLocation() const { return Loc; } 1162 1163 void setLocation(SourceLocation Location) { Loc = Location; } 1164 1165 static bool classof(const Stmt *T) { 1166 return T->getStmtClass() == IntegerLiteralClass; 1167 } 1168 static bool classof(const IntegerLiteral *) { return true; } 1169 1170 // Iterators 1171 child_range children() { return child_range(); } 1172}; 1173 1174class CharacterLiteral : public Expr { 1175public: 1176 enum CharacterKind { 1177 Ascii, 1178 Wide, 1179 UTF16, 1180 UTF32 1181 }; 1182 1183private: 1184 unsigned Value; 1185 SourceLocation Loc; 1186public: 1187 // type should be IntTy 1188 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1189 SourceLocation l) 1190 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1191 false, false), 1192 Value(value), Loc(l) { 1193 CharacterLiteralBits.Kind = kind; 1194 } 1195 1196 /// \brief Construct an empty character literal. 1197 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1198 1199 SourceLocation getLocation() const { return Loc; } 1200 CharacterKind getKind() const { 1201 return static_cast<CharacterKind>(CharacterLiteralBits.Kind); 1202 } 1203 1204 SourceRange getSourceRange() const { return SourceRange(Loc); } 1205 1206 unsigned getValue() const { return Value; } 1207 1208 void setLocation(SourceLocation Location) { Loc = Location; } 1209 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; } 1210 void setValue(unsigned Val) { Value = Val; } 1211 1212 static bool classof(const Stmt *T) { 1213 return T->getStmtClass() == CharacterLiteralClass; 1214 } 1215 static bool classof(const CharacterLiteral *) { return true; } 1216 1217 // Iterators 1218 child_range children() { return child_range(); } 1219}; 1220 1221class FloatingLiteral : public Expr, private APFloatStorage { 1222 SourceLocation Loc; 1223 1224 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1225 QualType Type, SourceLocation L) 1226 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1227 false, false), Loc(L) { 1228 FloatingLiteralBits.IsIEEE = 1229 &C.getTargetInfo().getLongDoubleFormat() == &llvm::APFloat::IEEEquad; 1230 FloatingLiteralBits.IsExact = isexact; 1231 setValue(C, V); 1232 } 1233 1234 /// \brief Construct an empty floating-point literal. 1235 explicit FloatingLiteral(ASTContext &C, EmptyShell Empty) 1236 : Expr(FloatingLiteralClass, Empty) { 1237 FloatingLiteralBits.IsIEEE = 1238 &C.getTargetInfo().getLongDoubleFormat() == &llvm::APFloat::IEEEquad; 1239 FloatingLiteralBits.IsExact = false; 1240 } 1241 1242public: 1243 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1244 bool isexact, QualType Type, SourceLocation L); 1245 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1246 1247 llvm::APFloat getValue() const { 1248 return APFloatStorage::getValue(FloatingLiteralBits.IsIEEE); 1249 } 1250 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1251 APFloatStorage::setValue(C, Val); 1252 } 1253 1254 bool isExact() const { return FloatingLiteralBits.IsExact; } 1255 void setExact(bool E) { FloatingLiteralBits.IsExact = E; } 1256 1257 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1258 /// double. Note that this may cause loss of precision, but is useful for 1259 /// debugging dumps, etc. 1260 double getValueAsApproximateDouble() const; 1261 1262 SourceLocation getLocation() const { return Loc; } 1263 void setLocation(SourceLocation L) { Loc = L; } 1264 1265 SourceRange getSourceRange() const { return SourceRange(Loc); } 1266 1267 static bool classof(const Stmt *T) { 1268 return T->getStmtClass() == FloatingLiteralClass; 1269 } 1270 static bool classof(const FloatingLiteral *) { return true; } 1271 1272 // Iterators 1273 child_range children() { return child_range(); } 1274}; 1275 1276/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1277/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1278/// IntegerLiteral classes. Instances of this class always have a Complex type 1279/// whose element type matches the subexpression. 1280/// 1281class ImaginaryLiteral : public Expr { 1282 Stmt *Val; 1283public: 1284 ImaginaryLiteral(Expr *val, QualType Ty) 1285 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1286 false, false), 1287 Val(val) {} 1288 1289 /// \brief Build an empty imaginary literal. 1290 explicit ImaginaryLiteral(EmptyShell Empty) 1291 : Expr(ImaginaryLiteralClass, Empty) { } 1292 1293 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1294 Expr *getSubExpr() { return cast<Expr>(Val); } 1295 void setSubExpr(Expr *E) { Val = E; } 1296 1297 SourceRange getSourceRange() const { return Val->getSourceRange(); } 1298 static bool classof(const Stmt *T) { 1299 return T->getStmtClass() == ImaginaryLiteralClass; 1300 } 1301 static bool classof(const ImaginaryLiteral *) { return true; } 1302 1303 // Iterators 1304 child_range children() { return child_range(&Val, &Val+1); } 1305}; 1306 1307/// StringLiteral - This represents a string literal expression, e.g. "foo" 1308/// or L"bar" (wide strings). The actual string is returned by getStrData() 1309/// is NOT null-terminated, and the length of the string is determined by 1310/// calling getByteLength(). The C type for a string is always a 1311/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1312/// not. 1313/// 1314/// Note that strings in C can be formed by concatenation of multiple string 1315/// literal pptokens in translation phase #6. This keeps track of the locations 1316/// of each of these pieces. 1317/// 1318/// Strings in C can also be truncated and extended by assigning into arrays, 1319/// e.g. with constructs like: 1320/// char X[2] = "foobar"; 1321/// In this case, getByteLength() will return 6, but the string literal will 1322/// have type "char[2]". 1323class StringLiteral : public Expr { 1324public: 1325 enum StringKind { 1326 Ascii, 1327 Wide, 1328 UTF8, 1329 UTF16, 1330 UTF32 1331 }; 1332 1333private: 1334 friend class ASTStmtReader; 1335 1336 union { 1337 const char *asChar; 1338 const uint16_t *asUInt16; 1339 const uint32_t *asUInt32; 1340 } StrData; 1341 unsigned Length; 1342 unsigned CharByteWidth : 4; 1343 unsigned Kind : 3; 1344 unsigned IsPascal : 1; 1345 unsigned NumConcatenated; 1346 SourceLocation TokLocs[1]; 1347 1348 StringLiteral(QualType Ty) : 1349 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1350 false) {} 1351 1352 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1353 1354public: 1355 /// This is the "fully general" constructor that allows representation of 1356 /// strings formed from multiple concatenated tokens. 1357 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1358 bool Pascal, QualType Ty, 1359 const SourceLocation *Loc, unsigned NumStrs); 1360 1361 /// Simple constructor for string literals made from one token. 1362 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1363 bool Pascal, QualType Ty, 1364 SourceLocation Loc) { 1365 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1366 } 1367 1368 /// \brief Construct an empty string literal. 1369 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1370 1371 StringRef getString() const { 1372 assert(CharByteWidth==1 1373 && "This function is used in places that assume strings use char"); 1374 return StringRef(StrData.asChar, getByteLength()); 1375 } 1376 1377 /// Allow clients that need the byte representation, such as ASTWriterStmt 1378 /// ::VisitStringLiteral(), access. 1379 StringRef getBytes() const { 1380 // FIXME: StringRef may not be the right type to use as a result for this. 1381 if (CharByteWidth == 1) 1382 return StringRef(StrData.asChar, getByteLength()); 1383 if (CharByteWidth == 4) 1384 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1385 getByteLength()); 1386 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1387 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1388 getByteLength()); 1389 } 1390 1391 uint32_t getCodeUnit(size_t i) const { 1392 assert(i < Length && "out of bounds access"); 1393 if (CharByteWidth == 1) 1394 return static_cast<unsigned char>(StrData.asChar[i]); 1395 if (CharByteWidth == 4) 1396 return StrData.asUInt32[i]; 1397 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1398 return StrData.asUInt16[i]; 1399 } 1400 1401 unsigned getByteLength() const { return CharByteWidth*Length; } 1402 unsigned getLength() const { return Length; } 1403 unsigned getCharByteWidth() const { return CharByteWidth; } 1404 1405 /// \brief Sets the string data to the given string data. 1406 void setString(ASTContext &C, StringRef Str, 1407 StringKind Kind, bool IsPascal); 1408 1409 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1410 1411 1412 bool isAscii() const { return Kind == Ascii; } 1413 bool isWide() const { return Kind == Wide; } 1414 bool isUTF8() const { return Kind == UTF8; } 1415 bool isUTF16() const { return Kind == UTF16; } 1416 bool isUTF32() const { return Kind == UTF32; } 1417 bool isPascal() const { return IsPascal; } 1418 1419 bool containsNonAsciiOrNull() const { 1420 StringRef Str = getString(); 1421 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1422 if (!isascii(Str[i]) || !Str[i]) 1423 return true; 1424 return false; 1425 } 1426 1427 /// getNumConcatenated - Get the number of string literal tokens that were 1428 /// concatenated in translation phase #6 to form this string literal. 1429 unsigned getNumConcatenated() const { return NumConcatenated; } 1430 1431 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1432 assert(TokNum < NumConcatenated && "Invalid tok number"); 1433 return TokLocs[TokNum]; 1434 } 1435 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1436 assert(TokNum < NumConcatenated && "Invalid tok number"); 1437 TokLocs[TokNum] = L; 1438 } 1439 1440 /// getLocationOfByte - Return a source location that points to the specified 1441 /// byte of this string literal. 1442 /// 1443 /// Strings are amazingly complex. They can be formed from multiple tokens 1444 /// and can have escape sequences in them in addition to the usual trigraph 1445 /// and escaped newline business. This routine handles this complexity. 1446 /// 1447 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1448 const LangOptions &Features, 1449 const TargetInfo &Target) const; 1450 1451 typedef const SourceLocation *tokloc_iterator; 1452 tokloc_iterator tokloc_begin() const { return TokLocs; } 1453 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1454 1455 SourceRange getSourceRange() const { 1456 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1457 } 1458 static bool classof(const Stmt *T) { 1459 return T->getStmtClass() == StringLiteralClass; 1460 } 1461 static bool classof(const StringLiteral *) { return true; } 1462 1463 // Iterators 1464 child_range children() { return child_range(); } 1465}; 1466 1467/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1468/// AST node is only formed if full location information is requested. 1469class ParenExpr : public Expr { 1470 SourceLocation L, R; 1471 Stmt *Val; 1472public: 1473 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1474 : Expr(ParenExprClass, val->getType(), 1475 val->getValueKind(), val->getObjectKind(), 1476 val->isTypeDependent(), val->isValueDependent(), 1477 val->isInstantiationDependent(), 1478 val->containsUnexpandedParameterPack()), 1479 L(l), R(r), Val(val) {} 1480 1481 /// \brief Construct an empty parenthesized expression. 1482 explicit ParenExpr(EmptyShell Empty) 1483 : Expr(ParenExprClass, Empty) { } 1484 1485 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1486 Expr *getSubExpr() { return cast<Expr>(Val); } 1487 void setSubExpr(Expr *E) { Val = E; } 1488 1489 SourceRange getSourceRange() const { return SourceRange(L, R); } 1490 1491 /// \brief Get the location of the left parentheses '('. 1492 SourceLocation getLParen() const { return L; } 1493 void setLParen(SourceLocation Loc) { L = Loc; } 1494 1495 /// \brief Get the location of the right parentheses ')'. 1496 SourceLocation getRParen() const { return R; } 1497 void setRParen(SourceLocation Loc) { R = Loc; } 1498 1499 static bool classof(const Stmt *T) { 1500 return T->getStmtClass() == ParenExprClass; 1501 } 1502 static bool classof(const ParenExpr *) { return true; } 1503 1504 // Iterators 1505 child_range children() { return child_range(&Val, &Val+1); } 1506}; 1507 1508 1509/// UnaryOperator - This represents the unary-expression's (except sizeof and 1510/// alignof), the postinc/postdec operators from postfix-expression, and various 1511/// extensions. 1512/// 1513/// Notes on various nodes: 1514/// 1515/// Real/Imag - These return the real/imag part of a complex operand. If 1516/// applied to a non-complex value, the former returns its operand and the 1517/// later returns zero in the type of the operand. 1518/// 1519class UnaryOperator : public Expr { 1520public: 1521 typedef UnaryOperatorKind Opcode; 1522 1523private: 1524 unsigned Opc : 5; 1525 SourceLocation Loc; 1526 Stmt *Val; 1527public: 1528 1529 UnaryOperator(Expr *input, Opcode opc, QualType type, 1530 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1531 : Expr(UnaryOperatorClass, type, VK, OK, 1532 input->isTypeDependent() || type->isDependentType(), 1533 input->isValueDependent(), 1534 (input->isInstantiationDependent() || 1535 type->isInstantiationDependentType()), 1536 input->containsUnexpandedParameterPack()), 1537 Opc(opc), Loc(l), Val(input) {} 1538 1539 /// \brief Build an empty unary operator. 1540 explicit UnaryOperator(EmptyShell Empty) 1541 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1542 1543 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1544 void setOpcode(Opcode O) { Opc = O; } 1545 1546 Expr *getSubExpr() const { return cast<Expr>(Val); } 1547 void setSubExpr(Expr *E) { Val = E; } 1548 1549 /// getOperatorLoc - Return the location of the operator. 1550 SourceLocation getOperatorLoc() const { return Loc; } 1551 void setOperatorLoc(SourceLocation L) { Loc = L; } 1552 1553 /// isPostfix - Return true if this is a postfix operation, like x++. 1554 static bool isPostfix(Opcode Op) { 1555 return Op == UO_PostInc || Op == UO_PostDec; 1556 } 1557 1558 /// isPrefix - Return true if this is a prefix operation, like --x. 1559 static bool isPrefix(Opcode Op) { 1560 return Op == UO_PreInc || Op == UO_PreDec; 1561 } 1562 1563 bool isPrefix() const { return isPrefix(getOpcode()); } 1564 bool isPostfix() const { return isPostfix(getOpcode()); } 1565 1566 static bool isIncrementOp(Opcode Op) { 1567 return Op == UO_PreInc || Op == UO_PostInc; 1568 } 1569 bool isIncrementOp() const { 1570 return isIncrementOp(getOpcode()); 1571 } 1572 1573 static bool isDecrementOp(Opcode Op) { 1574 return Op == UO_PreDec || Op == UO_PostDec; 1575 } 1576 bool isDecrementOp() const { 1577 return isDecrementOp(getOpcode()); 1578 } 1579 1580 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1581 bool isIncrementDecrementOp() const { 1582 return isIncrementDecrementOp(getOpcode()); 1583 } 1584 1585 static bool isArithmeticOp(Opcode Op) { 1586 return Op >= UO_Plus && Op <= UO_LNot; 1587 } 1588 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1589 1590 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1591 /// corresponds to, e.g. "sizeof" or "[pre]++" 1592 static const char *getOpcodeStr(Opcode Op); 1593 1594 /// \brief Retrieve the unary opcode that corresponds to the given 1595 /// overloaded operator. 1596 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1597 1598 /// \brief Retrieve the overloaded operator kind that corresponds to 1599 /// the given unary opcode. 1600 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1601 1602 SourceRange getSourceRange() const { 1603 if (isPostfix()) 1604 return SourceRange(Val->getLocStart(), Loc); 1605 else 1606 return SourceRange(Loc, Val->getLocEnd()); 1607 } 1608 SourceLocation getExprLoc() const { return Loc; } 1609 1610 static bool classof(const Stmt *T) { 1611 return T->getStmtClass() == UnaryOperatorClass; 1612 } 1613 static bool classof(const UnaryOperator *) { return true; } 1614 1615 // Iterators 1616 child_range children() { return child_range(&Val, &Val+1); } 1617}; 1618 1619/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1620/// offsetof(record-type, member-designator). For example, given: 1621/// @code 1622/// struct S { 1623/// float f; 1624/// double d; 1625/// }; 1626/// struct T { 1627/// int i; 1628/// struct S s[10]; 1629/// }; 1630/// @endcode 1631/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1632 1633class OffsetOfExpr : public Expr { 1634public: 1635 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1636 class OffsetOfNode { 1637 public: 1638 /// \brief The kind of offsetof node we have. 1639 enum Kind { 1640 /// \brief An index into an array. 1641 Array = 0x00, 1642 /// \brief A field. 1643 Field = 0x01, 1644 /// \brief A field in a dependent type, known only by its name. 1645 Identifier = 0x02, 1646 /// \brief An implicit indirection through a C++ base class, when the 1647 /// field found is in a base class. 1648 Base = 0x03 1649 }; 1650 1651 private: 1652 enum { MaskBits = 2, Mask = 0x03 }; 1653 1654 /// \brief The source range that covers this part of the designator. 1655 SourceRange Range; 1656 1657 /// \brief The data describing the designator, which comes in three 1658 /// different forms, depending on the lower two bits. 1659 /// - An unsigned index into the array of Expr*'s stored after this node 1660 /// in memory, for [constant-expression] designators. 1661 /// - A FieldDecl*, for references to a known field. 1662 /// - An IdentifierInfo*, for references to a field with a given name 1663 /// when the class type is dependent. 1664 /// - A CXXBaseSpecifier*, for references that look at a field in a 1665 /// base class. 1666 uintptr_t Data; 1667 1668 public: 1669 /// \brief Create an offsetof node that refers to an array element. 1670 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1671 SourceLocation RBracketLoc) 1672 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1673 1674 /// \brief Create an offsetof node that refers to a field. 1675 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1676 SourceLocation NameLoc) 1677 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1678 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1679 1680 /// \brief Create an offsetof node that refers to an identifier. 1681 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1682 SourceLocation NameLoc) 1683 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1684 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1685 1686 /// \brief Create an offsetof node that refers into a C++ base class. 1687 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1688 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1689 1690 /// \brief Determine what kind of offsetof node this is. 1691 Kind getKind() const { 1692 return static_cast<Kind>(Data & Mask); 1693 } 1694 1695 /// \brief For an array element node, returns the index into the array 1696 /// of expressions. 1697 unsigned getArrayExprIndex() const { 1698 assert(getKind() == Array); 1699 return Data >> 2; 1700 } 1701 1702 /// \brief For a field offsetof node, returns the field. 1703 FieldDecl *getField() const { 1704 assert(getKind() == Field); 1705 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1706 } 1707 1708 /// \brief For a field or identifier offsetof node, returns the name of 1709 /// the field. 1710 IdentifierInfo *getFieldName() const; 1711 1712 /// \brief For a base class node, returns the base specifier. 1713 CXXBaseSpecifier *getBase() const { 1714 assert(getKind() == Base); 1715 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1716 } 1717 1718 /// \brief Retrieve the source range that covers this offsetof node. 1719 /// 1720 /// For an array element node, the source range contains the locations of 1721 /// the square brackets. For a field or identifier node, the source range 1722 /// contains the location of the period (if there is one) and the 1723 /// identifier. 1724 SourceRange getSourceRange() const { return Range; } 1725 }; 1726 1727private: 1728 1729 SourceLocation OperatorLoc, RParenLoc; 1730 // Base type; 1731 TypeSourceInfo *TSInfo; 1732 // Number of sub-components (i.e. instances of OffsetOfNode). 1733 unsigned NumComps; 1734 // Number of sub-expressions (i.e. array subscript expressions). 1735 unsigned NumExprs; 1736 1737 OffsetOfExpr(ASTContext &C, QualType type, 1738 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1739 OffsetOfNode* compsPtr, unsigned numComps, 1740 Expr** exprsPtr, unsigned numExprs, 1741 SourceLocation RParenLoc); 1742 1743 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1744 : Expr(OffsetOfExprClass, EmptyShell()), 1745 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1746 1747public: 1748 1749 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1750 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1751 OffsetOfNode* compsPtr, unsigned numComps, 1752 Expr** exprsPtr, unsigned numExprs, 1753 SourceLocation RParenLoc); 1754 1755 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1756 unsigned NumComps, unsigned NumExprs); 1757 1758 /// getOperatorLoc - Return the location of the operator. 1759 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1760 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1761 1762 /// \brief Return the location of the right parentheses. 1763 SourceLocation getRParenLoc() const { return RParenLoc; } 1764 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1765 1766 TypeSourceInfo *getTypeSourceInfo() const { 1767 return TSInfo; 1768 } 1769 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1770 TSInfo = tsi; 1771 } 1772 1773 const OffsetOfNode &getComponent(unsigned Idx) const { 1774 assert(Idx < NumComps && "Subscript out of range"); 1775 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1776 } 1777 1778 void setComponent(unsigned Idx, OffsetOfNode ON) { 1779 assert(Idx < NumComps && "Subscript out of range"); 1780 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1781 } 1782 1783 unsigned getNumComponents() const { 1784 return NumComps; 1785 } 1786 1787 Expr* getIndexExpr(unsigned Idx) { 1788 assert(Idx < NumExprs && "Subscript out of range"); 1789 return reinterpret_cast<Expr **>( 1790 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1791 } 1792 const Expr *getIndexExpr(unsigned Idx) const { 1793 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1794 } 1795 1796 void setIndexExpr(unsigned Idx, Expr* E) { 1797 assert(Idx < NumComps && "Subscript out of range"); 1798 reinterpret_cast<Expr **>( 1799 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1800 } 1801 1802 unsigned getNumExpressions() const { 1803 return NumExprs; 1804 } 1805 1806 SourceRange getSourceRange() const { 1807 return SourceRange(OperatorLoc, RParenLoc); 1808 } 1809 1810 static bool classof(const Stmt *T) { 1811 return T->getStmtClass() == OffsetOfExprClass; 1812 } 1813 1814 static bool classof(const OffsetOfExpr *) { return true; } 1815 1816 // Iterators 1817 child_range children() { 1818 Stmt **begin = 1819 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1820 + NumComps); 1821 return child_range(begin, begin + NumExprs); 1822 } 1823}; 1824 1825/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1826/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1827/// vec_step (OpenCL 1.1 6.11.12). 1828class UnaryExprOrTypeTraitExpr : public Expr { 1829 union { 1830 TypeSourceInfo *Ty; 1831 Stmt *Ex; 1832 } Argument; 1833 SourceLocation OpLoc, RParenLoc; 1834 1835public: 1836 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1837 QualType resultType, SourceLocation op, 1838 SourceLocation rp) : 1839 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1840 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1841 // Value-dependent if the argument is type-dependent. 1842 TInfo->getType()->isDependentType(), 1843 TInfo->getType()->isInstantiationDependentType(), 1844 TInfo->getType()->containsUnexpandedParameterPack()), 1845 OpLoc(op), RParenLoc(rp) { 1846 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1847 UnaryExprOrTypeTraitExprBits.IsType = true; 1848 Argument.Ty = TInfo; 1849 } 1850 1851 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1852 QualType resultType, SourceLocation op, 1853 SourceLocation rp) : 1854 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1855 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1856 // Value-dependent if the argument is type-dependent. 1857 E->isTypeDependent(), 1858 E->isInstantiationDependent(), 1859 E->containsUnexpandedParameterPack()), 1860 OpLoc(op), RParenLoc(rp) { 1861 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1862 UnaryExprOrTypeTraitExprBits.IsType = false; 1863 Argument.Ex = E; 1864 } 1865 1866 /// \brief Construct an empty sizeof/alignof expression. 1867 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1868 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1869 1870 UnaryExprOrTypeTrait getKind() const { 1871 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind); 1872 } 1873 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;} 1874 1875 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; } 1876 QualType getArgumentType() const { 1877 return getArgumentTypeInfo()->getType(); 1878 } 1879 TypeSourceInfo *getArgumentTypeInfo() const { 1880 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1881 return Argument.Ty; 1882 } 1883 Expr *getArgumentExpr() { 1884 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1885 return static_cast<Expr*>(Argument.Ex); 1886 } 1887 const Expr *getArgumentExpr() const { 1888 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1889 } 1890 1891 void setArgument(Expr *E) { 1892 Argument.Ex = E; 1893 UnaryExprOrTypeTraitExprBits.IsType = false; 1894 } 1895 void setArgument(TypeSourceInfo *TInfo) { 1896 Argument.Ty = TInfo; 1897 UnaryExprOrTypeTraitExprBits.IsType = true; 1898 } 1899 1900 /// Gets the argument type, or the type of the argument expression, whichever 1901 /// is appropriate. 1902 QualType getTypeOfArgument() const { 1903 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1904 } 1905 1906 SourceLocation getOperatorLoc() const { return OpLoc; } 1907 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1908 1909 SourceLocation getRParenLoc() const { return RParenLoc; } 1910 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1911 1912 SourceRange getSourceRange() const { 1913 return SourceRange(OpLoc, RParenLoc); 1914 } 1915 1916 static bool classof(const Stmt *T) { 1917 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1918 } 1919 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1920 1921 // Iterators 1922 child_range children(); 1923}; 1924 1925//===----------------------------------------------------------------------===// 1926// Postfix Operators. 1927//===----------------------------------------------------------------------===// 1928 1929/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1930class ArraySubscriptExpr : public Expr { 1931 enum { LHS, RHS, END_EXPR=2 }; 1932 Stmt* SubExprs[END_EXPR]; 1933 SourceLocation RBracketLoc; 1934public: 1935 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1936 ExprValueKind VK, ExprObjectKind OK, 1937 SourceLocation rbracketloc) 1938 : Expr(ArraySubscriptExprClass, t, VK, OK, 1939 lhs->isTypeDependent() || rhs->isTypeDependent(), 1940 lhs->isValueDependent() || rhs->isValueDependent(), 1941 (lhs->isInstantiationDependent() || 1942 rhs->isInstantiationDependent()), 1943 (lhs->containsUnexpandedParameterPack() || 1944 rhs->containsUnexpandedParameterPack())), 1945 RBracketLoc(rbracketloc) { 1946 SubExprs[LHS] = lhs; 1947 SubExprs[RHS] = rhs; 1948 } 1949 1950 /// \brief Create an empty array subscript expression. 1951 explicit ArraySubscriptExpr(EmptyShell Shell) 1952 : Expr(ArraySubscriptExprClass, Shell) { } 1953 1954 /// An array access can be written A[4] or 4[A] (both are equivalent). 1955 /// - getBase() and getIdx() always present the normalized view: A[4]. 1956 /// In this case getBase() returns "A" and getIdx() returns "4". 1957 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1958 /// 4[A] getLHS() returns "4". 1959 /// Note: Because vector element access is also written A[4] we must 1960 /// predicate the format conversion in getBase and getIdx only on the 1961 /// the type of the RHS, as it is possible for the LHS to be a vector of 1962 /// integer type 1963 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1964 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1965 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1966 1967 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1968 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1969 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1970 1971 Expr *getBase() { 1972 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1973 } 1974 1975 const Expr *getBase() const { 1976 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1977 } 1978 1979 Expr *getIdx() { 1980 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1981 } 1982 1983 const Expr *getIdx() const { 1984 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1985 } 1986 1987 SourceRange getSourceRange() const { 1988 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1989 } 1990 1991 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1992 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1993 1994 SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1995 1996 static bool classof(const Stmt *T) { 1997 return T->getStmtClass() == ArraySubscriptExprClass; 1998 } 1999 static bool classof(const ArraySubscriptExpr *) { return true; } 2000 2001 // Iterators 2002 child_range children() { 2003 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2004 } 2005}; 2006 2007 2008/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 2009/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 2010/// while its subclasses may represent alternative syntax that (semantically) 2011/// results in a function call. For example, CXXOperatorCallExpr is 2012/// a subclass for overloaded operator calls that use operator syntax, e.g., 2013/// "str1 + str2" to resolve to a function call. 2014class CallExpr : public Expr { 2015 enum { FN=0, PREARGS_START=1 }; 2016 Stmt **SubExprs; 2017 unsigned NumArgs; 2018 SourceLocation RParenLoc; 2019 2020protected: 2021 // These versions of the constructor are for derived classes. 2022 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 2023 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 2024 SourceLocation rparenloc); 2025 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 2026 2027 Stmt *getPreArg(unsigned i) { 2028 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2029 return SubExprs[PREARGS_START+i]; 2030 } 2031 const Stmt *getPreArg(unsigned i) const { 2032 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2033 return SubExprs[PREARGS_START+i]; 2034 } 2035 void setPreArg(unsigned i, Stmt *PreArg) { 2036 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2037 SubExprs[PREARGS_START+i] = PreArg; 2038 } 2039 2040 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2041 2042public: 2043 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 2044 ExprValueKind VK, SourceLocation rparenloc); 2045 2046 /// \brief Build an empty call expression. 2047 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 2048 2049 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2050 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2051 void setCallee(Expr *F) { SubExprs[FN] = F; } 2052 2053 Decl *getCalleeDecl(); 2054 const Decl *getCalleeDecl() const { 2055 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2056 } 2057 2058 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2059 FunctionDecl *getDirectCallee(); 2060 const FunctionDecl *getDirectCallee() const { 2061 return const_cast<CallExpr*>(this)->getDirectCallee(); 2062 } 2063 2064 /// getNumArgs - Return the number of actual arguments to this call. 2065 /// 2066 unsigned getNumArgs() const { return NumArgs; } 2067 2068 /// \brief Retrieve the call arguments. 2069 Expr **getArgs() { 2070 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2071 } 2072 const Expr *const *getArgs() const { 2073 return const_cast<CallExpr*>(this)->getArgs(); 2074 } 2075 2076 /// getArg - Return the specified argument. 2077 Expr *getArg(unsigned Arg) { 2078 assert(Arg < NumArgs && "Arg access out of range!"); 2079 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2080 } 2081 const Expr *getArg(unsigned Arg) const { 2082 assert(Arg < NumArgs && "Arg access out of range!"); 2083 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2084 } 2085 2086 /// setArg - Set the specified argument. 2087 void setArg(unsigned Arg, Expr *ArgExpr) { 2088 assert(Arg < NumArgs && "Arg access out of range!"); 2089 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2090 } 2091 2092 /// setNumArgs - This changes the number of arguments present in this call. 2093 /// Any orphaned expressions are deleted by this, and any new operands are set 2094 /// to null. 2095 void setNumArgs(ASTContext& C, unsigned NumArgs); 2096 2097 typedef ExprIterator arg_iterator; 2098 typedef ConstExprIterator const_arg_iterator; 2099 2100 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2101 arg_iterator arg_end() { 2102 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2103 } 2104 const_arg_iterator arg_begin() const { 2105 return SubExprs+PREARGS_START+getNumPreArgs(); 2106 } 2107 const_arg_iterator arg_end() const { 2108 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2109 } 2110 2111 /// getNumCommas - Return the number of commas that must have been present in 2112 /// this function call. 2113 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2114 2115 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2116 /// not, return 0. 2117 unsigned isBuiltinCall() const; 2118 2119 /// getCallReturnType - Get the return type of the call expr. This is not 2120 /// always the type of the expr itself, if the return type is a reference 2121 /// type. 2122 QualType getCallReturnType() const; 2123 2124 SourceLocation getRParenLoc() const { return RParenLoc; } 2125 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2126 2127 SourceRange getSourceRange() const; 2128 2129 static bool classof(const Stmt *T) { 2130 return T->getStmtClass() >= firstCallExprConstant && 2131 T->getStmtClass() <= lastCallExprConstant; 2132 } 2133 static bool classof(const CallExpr *) { return true; } 2134 2135 // Iterators 2136 child_range children() { 2137 return child_range(&SubExprs[0], 2138 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2139 } 2140}; 2141 2142/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2143/// 2144class MemberExpr : public Expr { 2145 /// Extra data stored in some member expressions. 2146 struct MemberNameQualifier { 2147 /// \brief The nested-name-specifier that qualifies the name, including 2148 /// source-location information. 2149 NestedNameSpecifierLoc QualifierLoc; 2150 2151 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2152 /// name qualifiers. 2153 DeclAccessPair FoundDecl; 2154 }; 2155 2156 /// Base - the expression for the base pointer or structure references. In 2157 /// X.F, this is "X". 2158 Stmt *Base; 2159 2160 /// MemberDecl - This is the decl being referenced by the field/member name. 2161 /// In X.F, this is the decl referenced by F. 2162 ValueDecl *MemberDecl; 2163 2164 /// MemberDNLoc - Provides source/type location info for the 2165 /// declaration name embedded in MemberDecl. 2166 DeclarationNameLoc MemberDNLoc; 2167 2168 /// MemberLoc - This is the location of the member name. 2169 SourceLocation MemberLoc; 2170 2171 /// IsArrow - True if this is "X->F", false if this is "X.F". 2172 bool IsArrow : 1; 2173 2174 /// \brief True if this member expression used a nested-name-specifier to 2175 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2176 /// declaration. When true, a MemberNameQualifier 2177 /// structure is allocated immediately after the MemberExpr. 2178 bool HasQualifierOrFoundDecl : 1; 2179 2180 /// \brief True if this member expression specified a template keyword 2181 /// and/or a template argument list explicitly, e.g., x->f<int>, 2182 /// x->template f, x->template f<int>. 2183 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2184 /// TemplateArguments (if any) are allocated immediately after 2185 /// the MemberExpr or, if the member expression also has a qualifier, 2186 /// after the MemberNameQualifier structure. 2187 bool HasTemplateKWAndArgsInfo : 1; 2188 2189 /// \brief True if this member expression refers to a method that 2190 /// was resolved from an overloaded set having size greater than 1. 2191 bool HadMultipleCandidates : 1; 2192 2193 /// \brief Retrieve the qualifier that preceded the member name, if any. 2194 MemberNameQualifier *getMemberQualifier() { 2195 assert(HasQualifierOrFoundDecl); 2196 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2197 } 2198 2199 /// \brief Retrieve the qualifier that preceded the member name, if any. 2200 const MemberNameQualifier *getMemberQualifier() const { 2201 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2202 } 2203 2204public: 2205 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2206 const DeclarationNameInfo &NameInfo, QualType ty, 2207 ExprValueKind VK, ExprObjectKind OK) 2208 : Expr(MemberExprClass, ty, VK, OK, 2209 base->isTypeDependent(), 2210 base->isValueDependent(), 2211 base->isInstantiationDependent(), 2212 base->containsUnexpandedParameterPack()), 2213 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()), 2214 MemberLoc(NameInfo.getLoc()), IsArrow(isarrow), 2215 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2216 HadMultipleCandidates(false) { 2217 assert(memberdecl->getDeclName() == NameInfo.getName()); 2218 } 2219 2220 // NOTE: this constructor should be used only when it is known that 2221 // the member name can not provide additional syntactic info 2222 // (i.e., source locations for C++ operator names or type source info 2223 // for constructors, destructors and conversion operators). 2224 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2225 SourceLocation l, QualType ty, 2226 ExprValueKind VK, ExprObjectKind OK) 2227 : Expr(MemberExprClass, ty, VK, OK, 2228 base->isTypeDependent(), base->isValueDependent(), 2229 base->isInstantiationDependent(), 2230 base->containsUnexpandedParameterPack()), 2231 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l), 2232 IsArrow(isarrow), 2233 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2234 HadMultipleCandidates(false) {} 2235 2236 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2237 NestedNameSpecifierLoc QualifierLoc, 2238 SourceLocation TemplateKWLoc, 2239 ValueDecl *memberdecl, DeclAccessPair founddecl, 2240 DeclarationNameInfo MemberNameInfo, 2241 const TemplateArgumentListInfo *targs, 2242 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2243 2244 void setBase(Expr *E) { Base = E; } 2245 Expr *getBase() const { return cast<Expr>(Base); } 2246 2247 /// \brief Retrieve the member declaration to which this expression refers. 2248 /// 2249 /// The returned declaration will either be a FieldDecl or (in C++) 2250 /// a CXXMethodDecl. 2251 ValueDecl *getMemberDecl() const { return MemberDecl; } 2252 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2253 2254 /// \brief Retrieves the declaration found by lookup. 2255 DeclAccessPair getFoundDecl() const { 2256 if (!HasQualifierOrFoundDecl) 2257 return DeclAccessPair::make(getMemberDecl(), 2258 getMemberDecl()->getAccess()); 2259 return getMemberQualifier()->FoundDecl; 2260 } 2261 2262 /// \brief Determines whether this member expression actually had 2263 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2264 /// x->Base::foo. 2265 bool hasQualifier() const { return getQualifier() != 0; } 2266 2267 /// \brief If the member name was qualified, retrieves the 2268 /// nested-name-specifier that precedes the member name. Otherwise, returns 2269 /// NULL. 2270 NestedNameSpecifier *getQualifier() const { 2271 if (!HasQualifierOrFoundDecl) 2272 return 0; 2273 2274 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2275 } 2276 2277 /// \brief If the member name was qualified, retrieves the 2278 /// nested-name-specifier that precedes the member name, with source-location 2279 /// information. 2280 NestedNameSpecifierLoc getQualifierLoc() const { 2281 if (!hasQualifier()) 2282 return NestedNameSpecifierLoc(); 2283 2284 return getMemberQualifier()->QualifierLoc; 2285 } 2286 2287 /// \brief Return the optional template keyword and arguments info. 2288 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 2289 if (!HasTemplateKWAndArgsInfo) 2290 return 0; 2291 2292 if (!HasQualifierOrFoundDecl) 2293 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 2294 2295 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 2296 getMemberQualifier() + 1); 2297 } 2298 2299 /// \brief Return the optional template keyword and arguments info. 2300 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 2301 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo(); 2302 } 2303 2304 /// \brief Retrieve the location of the template keyword preceding 2305 /// the member name, if any. 2306 SourceLocation getTemplateKeywordLoc() const { 2307 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2308 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 2309 } 2310 2311 /// \brief Retrieve the location of the left angle bracket starting the 2312 /// explicit template argument list following the member name, if any. 2313 SourceLocation getLAngleLoc() const { 2314 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2315 return getTemplateKWAndArgsInfo()->LAngleLoc; 2316 } 2317 2318 /// \brief Retrieve the location of the right angle bracket ending the 2319 /// explicit template argument list following the member name, if any. 2320 SourceLocation getRAngleLoc() const { 2321 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2322 return getTemplateKWAndArgsInfo()->RAngleLoc; 2323 } 2324 2325 /// Determines whether the member name was preceded by the template keyword. 2326 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2327 2328 /// \brief Determines whether the member name was followed by an 2329 /// explicit template argument list. 2330 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2331 2332 /// \brief Copies the template arguments (if present) into the given 2333 /// structure. 2334 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2335 if (hasExplicitTemplateArgs()) 2336 getExplicitTemplateArgs().copyInto(List); 2337 } 2338 2339 /// \brief Retrieve the explicit template argument list that 2340 /// follow the member template name. This must only be called on an 2341 /// expression with explicit template arguments. 2342 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2343 assert(hasExplicitTemplateArgs()); 2344 return *getTemplateKWAndArgsInfo(); 2345 } 2346 2347 /// \brief Retrieve the explicit template argument list that 2348 /// followed the member template name. This must only be called on 2349 /// an expression with explicit template arguments. 2350 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2351 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2352 } 2353 2354 /// \brief Retrieves the optional explicit template arguments. 2355 /// This points to the same data as getExplicitTemplateArgs(), but 2356 /// returns null if there are no explicit template arguments. 2357 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2358 if (!hasExplicitTemplateArgs()) return 0; 2359 return &getExplicitTemplateArgs(); 2360 } 2361 2362 /// \brief Retrieve the template arguments provided as part of this 2363 /// template-id. 2364 const TemplateArgumentLoc *getTemplateArgs() const { 2365 if (!hasExplicitTemplateArgs()) 2366 return 0; 2367 2368 return getExplicitTemplateArgs().getTemplateArgs(); 2369 } 2370 2371 /// \brief Retrieve the number of template arguments provided as part of this 2372 /// template-id. 2373 unsigned getNumTemplateArgs() const { 2374 if (!hasExplicitTemplateArgs()) 2375 return 0; 2376 2377 return getExplicitTemplateArgs().NumTemplateArgs; 2378 } 2379 2380 /// \brief Retrieve the member declaration name info. 2381 DeclarationNameInfo getMemberNameInfo() const { 2382 return DeclarationNameInfo(MemberDecl->getDeclName(), 2383 MemberLoc, MemberDNLoc); 2384 } 2385 2386 bool isArrow() const { return IsArrow; } 2387 void setArrow(bool A) { IsArrow = A; } 2388 2389 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2390 /// location of 'F'. 2391 SourceLocation getMemberLoc() const { return MemberLoc; } 2392 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2393 2394 SourceRange getSourceRange() const; 2395 2396 SourceLocation getExprLoc() const { return MemberLoc; } 2397 2398 /// \brief Determine whether the base of this explicit is implicit. 2399 bool isImplicitAccess() const { 2400 return getBase() && getBase()->isImplicitCXXThis(); 2401 } 2402 2403 /// \brief Returns true if this member expression refers to a method that 2404 /// was resolved from an overloaded set having size greater than 1. 2405 bool hadMultipleCandidates() const { 2406 return HadMultipleCandidates; 2407 } 2408 /// \brief Sets the flag telling whether this expression refers to 2409 /// a method that was resolved from an overloaded set having size 2410 /// greater than 1. 2411 void setHadMultipleCandidates(bool V = true) { 2412 HadMultipleCandidates = V; 2413 } 2414 2415 static bool classof(const Stmt *T) { 2416 return T->getStmtClass() == MemberExprClass; 2417 } 2418 static bool classof(const MemberExpr *) { return true; } 2419 2420 // Iterators 2421 child_range children() { return child_range(&Base, &Base+1); } 2422 2423 friend class ASTReader; 2424 friend class ASTStmtWriter; 2425}; 2426 2427/// CompoundLiteralExpr - [C99 6.5.2.5] 2428/// 2429class CompoundLiteralExpr : public Expr { 2430 /// LParenLoc - If non-null, this is the location of the left paren in a 2431 /// compound literal like "(int){4}". This can be null if this is a 2432 /// synthesized compound expression. 2433 SourceLocation LParenLoc; 2434 2435 /// The type as written. This can be an incomplete array type, in 2436 /// which case the actual expression type will be different. 2437 /// The int part of the pair stores whether this expr is file scope. 2438 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope; 2439 Stmt *Init; 2440public: 2441 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2442 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2443 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2444 tinfo->getType()->isDependentType(), 2445 init->isValueDependent(), 2446 (init->isInstantiationDependent() || 2447 tinfo->getType()->isInstantiationDependentType()), 2448 init->containsUnexpandedParameterPack()), 2449 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {} 2450 2451 /// \brief Construct an empty compound literal. 2452 explicit CompoundLiteralExpr(EmptyShell Empty) 2453 : Expr(CompoundLiteralExprClass, Empty) { } 2454 2455 const Expr *getInitializer() const { return cast<Expr>(Init); } 2456 Expr *getInitializer() { return cast<Expr>(Init); } 2457 void setInitializer(Expr *E) { Init = E; } 2458 2459 bool isFileScope() const { return TInfoAndScope.getInt(); } 2460 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); } 2461 2462 SourceLocation getLParenLoc() const { return LParenLoc; } 2463 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2464 2465 TypeSourceInfo *getTypeSourceInfo() const { 2466 return TInfoAndScope.getPointer(); 2467 } 2468 void setTypeSourceInfo(TypeSourceInfo *tinfo) { 2469 TInfoAndScope.setPointer(tinfo); 2470 } 2471 2472 SourceRange getSourceRange() const { 2473 // FIXME: Init should never be null. 2474 if (!Init) 2475 return SourceRange(); 2476 if (LParenLoc.isInvalid()) 2477 return Init->getSourceRange(); 2478 return SourceRange(LParenLoc, Init->getLocEnd()); 2479 } 2480 2481 static bool classof(const Stmt *T) { 2482 return T->getStmtClass() == CompoundLiteralExprClass; 2483 } 2484 static bool classof(const CompoundLiteralExpr *) { return true; } 2485 2486 // Iterators 2487 child_range children() { return child_range(&Init, &Init+1); } 2488}; 2489 2490/// CastExpr - Base class for type casts, including both implicit 2491/// casts (ImplicitCastExpr) and explicit casts that have some 2492/// representation in the source code (ExplicitCastExpr's derived 2493/// classes). 2494class CastExpr : public Expr { 2495public: 2496 typedef clang::CastKind CastKind; 2497 2498private: 2499 Stmt *Op; 2500 2501 void CheckCastConsistency() const; 2502 2503 const CXXBaseSpecifier * const *path_buffer() const { 2504 return const_cast<CastExpr*>(this)->path_buffer(); 2505 } 2506 CXXBaseSpecifier **path_buffer(); 2507 2508 void setBasePathSize(unsigned basePathSize) { 2509 CastExprBits.BasePathSize = basePathSize; 2510 assert(CastExprBits.BasePathSize == basePathSize && 2511 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2512 } 2513 2514protected: 2515 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2516 const CastKind kind, Expr *op, unsigned BasePathSize) : 2517 Expr(SC, ty, VK, OK_Ordinary, 2518 // Cast expressions are type-dependent if the type is 2519 // dependent (C++ [temp.dep.expr]p3). 2520 ty->isDependentType(), 2521 // Cast expressions are value-dependent if the type is 2522 // dependent or if the subexpression is value-dependent. 2523 ty->isDependentType() || (op && op->isValueDependent()), 2524 (ty->isInstantiationDependentType() || 2525 (op && op->isInstantiationDependent())), 2526 (ty->containsUnexpandedParameterPack() || 2527 op->containsUnexpandedParameterPack())), 2528 Op(op) { 2529 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2530 CastExprBits.Kind = kind; 2531 setBasePathSize(BasePathSize); 2532#ifndef NDEBUG 2533 CheckCastConsistency(); 2534#endif 2535 } 2536 2537 /// \brief Construct an empty cast. 2538 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2539 : Expr(SC, Empty) { 2540 setBasePathSize(BasePathSize); 2541 } 2542 2543public: 2544 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2545 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2546 const char *getCastKindName() const; 2547 2548 Expr *getSubExpr() { return cast<Expr>(Op); } 2549 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2550 void setSubExpr(Expr *E) { Op = E; } 2551 2552 /// \brief Retrieve the cast subexpression as it was written in the source 2553 /// code, looking through any implicit casts or other intermediate nodes 2554 /// introduced by semantic analysis. 2555 Expr *getSubExprAsWritten(); 2556 const Expr *getSubExprAsWritten() const { 2557 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2558 } 2559 2560 typedef CXXBaseSpecifier **path_iterator; 2561 typedef const CXXBaseSpecifier * const *path_const_iterator; 2562 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2563 unsigned path_size() const { return CastExprBits.BasePathSize; } 2564 path_iterator path_begin() { return path_buffer(); } 2565 path_iterator path_end() { return path_buffer() + path_size(); } 2566 path_const_iterator path_begin() const { return path_buffer(); } 2567 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2568 2569 void setCastPath(const CXXCastPath &Path); 2570 2571 static bool classof(const Stmt *T) { 2572 return T->getStmtClass() >= firstCastExprConstant && 2573 T->getStmtClass() <= lastCastExprConstant; 2574 } 2575 static bool classof(const CastExpr *) { return true; } 2576 2577 // Iterators 2578 child_range children() { return child_range(&Op, &Op+1); } 2579}; 2580 2581/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2582/// conversions, which have no direct representation in the original 2583/// source code. For example: converting T[]->T*, void f()->void 2584/// (*f)(), float->double, short->int, etc. 2585/// 2586/// In C, implicit casts always produce rvalues. However, in C++, an 2587/// implicit cast whose result is being bound to a reference will be 2588/// an lvalue or xvalue. For example: 2589/// 2590/// @code 2591/// class Base { }; 2592/// class Derived : public Base { }; 2593/// Derived &&ref(); 2594/// void f(Derived d) { 2595/// Base& b = d; // initializer is an ImplicitCastExpr 2596/// // to an lvalue of type Base 2597/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2598/// // to an xvalue of type Base 2599/// } 2600/// @endcode 2601class ImplicitCastExpr : public CastExpr { 2602private: 2603 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2604 unsigned BasePathLength, ExprValueKind VK) 2605 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2606 } 2607 2608 /// \brief Construct an empty implicit cast. 2609 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2610 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2611 2612public: 2613 enum OnStack_t { OnStack }; 2614 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2615 ExprValueKind VK) 2616 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2617 } 2618 2619 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2620 CastKind Kind, Expr *Operand, 2621 const CXXCastPath *BasePath, 2622 ExprValueKind Cat); 2623 2624 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2625 2626 SourceRange getSourceRange() const { 2627 return getSubExpr()->getSourceRange(); 2628 } 2629 2630 static bool classof(const Stmt *T) { 2631 return T->getStmtClass() == ImplicitCastExprClass; 2632 } 2633 static bool classof(const ImplicitCastExpr *) { return true; } 2634}; 2635 2636inline Expr *Expr::IgnoreImpCasts() { 2637 Expr *e = this; 2638 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2639 e = ice->getSubExpr(); 2640 return e; 2641} 2642 2643/// ExplicitCastExpr - An explicit cast written in the source 2644/// code. 2645/// 2646/// This class is effectively an abstract class, because it provides 2647/// the basic representation of an explicitly-written cast without 2648/// specifying which kind of cast (C cast, functional cast, static 2649/// cast, etc.) was written; specific derived classes represent the 2650/// particular style of cast and its location information. 2651/// 2652/// Unlike implicit casts, explicit cast nodes have two different 2653/// types: the type that was written into the source code, and the 2654/// actual type of the expression as determined by semantic 2655/// analysis. These types may differ slightly. For example, in C++ one 2656/// can cast to a reference type, which indicates that the resulting 2657/// expression will be an lvalue or xvalue. The reference type, however, 2658/// will not be used as the type of the expression. 2659class ExplicitCastExpr : public CastExpr { 2660 /// TInfo - Source type info for the (written) type 2661 /// this expression is casting to. 2662 TypeSourceInfo *TInfo; 2663 2664protected: 2665 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2666 CastKind kind, Expr *op, unsigned PathSize, 2667 TypeSourceInfo *writtenTy) 2668 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2669 2670 /// \brief Construct an empty explicit cast. 2671 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2672 : CastExpr(SC, Shell, PathSize) { } 2673 2674public: 2675 /// getTypeInfoAsWritten - Returns the type source info for the type 2676 /// that this expression is casting to. 2677 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2678 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2679 2680 /// getTypeAsWritten - Returns the type that this expression is 2681 /// casting to, as written in the source code. 2682 QualType getTypeAsWritten() const { return TInfo->getType(); } 2683 2684 static bool classof(const Stmt *T) { 2685 return T->getStmtClass() >= firstExplicitCastExprConstant && 2686 T->getStmtClass() <= lastExplicitCastExprConstant; 2687 } 2688 static bool classof(const ExplicitCastExpr *) { return true; } 2689}; 2690 2691/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2692/// cast in C++ (C++ [expr.cast]), which uses the syntax 2693/// (Type)expr. For example: @c (int)f. 2694class CStyleCastExpr : public ExplicitCastExpr { 2695 SourceLocation LPLoc; // the location of the left paren 2696 SourceLocation RPLoc; // the location of the right paren 2697 2698 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2699 unsigned PathSize, TypeSourceInfo *writtenTy, 2700 SourceLocation l, SourceLocation r) 2701 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2702 writtenTy), LPLoc(l), RPLoc(r) {} 2703 2704 /// \brief Construct an empty C-style explicit cast. 2705 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2706 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2707 2708public: 2709 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2710 ExprValueKind VK, CastKind K, 2711 Expr *Op, const CXXCastPath *BasePath, 2712 TypeSourceInfo *WrittenTy, SourceLocation L, 2713 SourceLocation R); 2714 2715 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2716 2717 SourceLocation getLParenLoc() const { return LPLoc; } 2718 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2719 2720 SourceLocation getRParenLoc() const { return RPLoc; } 2721 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2722 2723 SourceRange getSourceRange() const { 2724 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2725 } 2726 static bool classof(const Stmt *T) { 2727 return T->getStmtClass() == CStyleCastExprClass; 2728 } 2729 static bool classof(const CStyleCastExpr *) { return true; } 2730}; 2731 2732/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2733/// 2734/// This expression node kind describes a builtin binary operation, 2735/// such as "x + y" for integer values "x" and "y". The operands will 2736/// already have been converted to appropriate types (e.g., by 2737/// performing promotions or conversions). 2738/// 2739/// In C++, where operators may be overloaded, a different kind of 2740/// expression node (CXXOperatorCallExpr) is used to express the 2741/// invocation of an overloaded operator with operator syntax. Within 2742/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2743/// used to store an expression "x + y" depends on the subexpressions 2744/// for x and y. If neither x or y is type-dependent, and the "+" 2745/// operator resolves to a built-in operation, BinaryOperator will be 2746/// used to express the computation (x and y may still be 2747/// value-dependent). If either x or y is type-dependent, or if the 2748/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2749/// be used to express the computation. 2750class BinaryOperator : public Expr { 2751public: 2752 typedef BinaryOperatorKind Opcode; 2753 2754private: 2755 unsigned Opc : 6; 2756 SourceLocation OpLoc; 2757 2758 enum { LHS, RHS, END_EXPR }; 2759 Stmt* SubExprs[END_EXPR]; 2760public: 2761 2762 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2763 ExprValueKind VK, ExprObjectKind OK, 2764 SourceLocation opLoc) 2765 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2766 lhs->isTypeDependent() || rhs->isTypeDependent(), 2767 lhs->isValueDependent() || rhs->isValueDependent(), 2768 (lhs->isInstantiationDependent() || 2769 rhs->isInstantiationDependent()), 2770 (lhs->containsUnexpandedParameterPack() || 2771 rhs->containsUnexpandedParameterPack())), 2772 Opc(opc), OpLoc(opLoc) { 2773 SubExprs[LHS] = lhs; 2774 SubExprs[RHS] = rhs; 2775 assert(!isCompoundAssignmentOp() && 2776 "Use ArithAssignBinaryOperator for compound assignments"); 2777 } 2778 2779 /// \brief Construct an empty binary operator. 2780 explicit BinaryOperator(EmptyShell Empty) 2781 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2782 2783 SourceLocation getExprLoc() const { return OpLoc; } 2784 SourceLocation getOperatorLoc() const { return OpLoc; } 2785 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2786 2787 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2788 void setOpcode(Opcode O) { Opc = O; } 2789 2790 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2791 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2792 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2793 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2794 2795 SourceRange getSourceRange() const { 2796 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2797 } 2798 2799 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2800 /// corresponds to, e.g. "<<=". 2801 static const char *getOpcodeStr(Opcode Op); 2802 2803 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2804 2805 /// \brief Retrieve the binary opcode that corresponds to the given 2806 /// overloaded operator. 2807 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2808 2809 /// \brief Retrieve the overloaded operator kind that corresponds to 2810 /// the given binary opcode. 2811 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2812 2813 /// predicates to categorize the respective opcodes. 2814 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2815 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2816 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2817 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2818 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2819 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2820 2821 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2822 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2823 2824 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2825 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2826 2827 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2828 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2829 2830 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2831 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2832 2833 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2834 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2835 2836 static bool isAssignmentOp(Opcode Opc) { 2837 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2838 } 2839 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2840 2841 static bool isCompoundAssignmentOp(Opcode Opc) { 2842 return Opc > BO_Assign && Opc <= BO_OrAssign; 2843 } 2844 bool isCompoundAssignmentOp() const { 2845 return isCompoundAssignmentOp(getOpcode()); 2846 } 2847 static Opcode getOpForCompoundAssignment(Opcode Opc) { 2848 assert(isCompoundAssignmentOp(Opc)); 2849 if (Opc >= BO_AndAssign) 2850 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 2851 else 2852 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 2853 } 2854 2855 static bool isShiftAssignOp(Opcode Opc) { 2856 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2857 } 2858 bool isShiftAssignOp() const { 2859 return isShiftAssignOp(getOpcode()); 2860 } 2861 2862 static bool classof(const Stmt *S) { 2863 return S->getStmtClass() >= firstBinaryOperatorConstant && 2864 S->getStmtClass() <= lastBinaryOperatorConstant; 2865 } 2866 static bool classof(const BinaryOperator *) { return true; } 2867 2868 // Iterators 2869 child_range children() { 2870 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2871 } 2872 2873protected: 2874 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2875 ExprValueKind VK, ExprObjectKind OK, 2876 SourceLocation opLoc, bool dead) 2877 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2878 lhs->isTypeDependent() || rhs->isTypeDependent(), 2879 lhs->isValueDependent() || rhs->isValueDependent(), 2880 (lhs->isInstantiationDependent() || 2881 rhs->isInstantiationDependent()), 2882 (lhs->containsUnexpandedParameterPack() || 2883 rhs->containsUnexpandedParameterPack())), 2884 Opc(opc), OpLoc(opLoc) { 2885 SubExprs[LHS] = lhs; 2886 SubExprs[RHS] = rhs; 2887 } 2888 2889 BinaryOperator(StmtClass SC, EmptyShell Empty) 2890 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2891}; 2892 2893/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2894/// track of the type the operation is performed in. Due to the semantics of 2895/// these operators, the operands are promoted, the arithmetic performed, an 2896/// implicit conversion back to the result type done, then the assignment takes 2897/// place. This captures the intermediate type which the computation is done 2898/// in. 2899class CompoundAssignOperator : public BinaryOperator { 2900 QualType ComputationLHSType; 2901 QualType ComputationResultType; 2902public: 2903 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2904 ExprValueKind VK, ExprObjectKind OK, 2905 QualType CompLHSType, QualType CompResultType, 2906 SourceLocation OpLoc) 2907 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2908 ComputationLHSType(CompLHSType), 2909 ComputationResultType(CompResultType) { 2910 assert(isCompoundAssignmentOp() && 2911 "Only should be used for compound assignments"); 2912 } 2913 2914 /// \brief Build an empty compound assignment operator expression. 2915 explicit CompoundAssignOperator(EmptyShell Empty) 2916 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2917 2918 // The two computation types are the type the LHS is converted 2919 // to for the computation and the type of the result; the two are 2920 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2921 QualType getComputationLHSType() const { return ComputationLHSType; } 2922 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2923 2924 QualType getComputationResultType() const { return ComputationResultType; } 2925 void setComputationResultType(QualType T) { ComputationResultType = T; } 2926 2927 static bool classof(const CompoundAssignOperator *) { return true; } 2928 static bool classof(const Stmt *S) { 2929 return S->getStmtClass() == CompoundAssignOperatorClass; 2930 } 2931}; 2932 2933/// AbstractConditionalOperator - An abstract base class for 2934/// ConditionalOperator and BinaryConditionalOperator. 2935class AbstractConditionalOperator : public Expr { 2936 SourceLocation QuestionLoc, ColonLoc; 2937 friend class ASTStmtReader; 2938 2939protected: 2940 AbstractConditionalOperator(StmtClass SC, QualType T, 2941 ExprValueKind VK, ExprObjectKind OK, 2942 bool TD, bool VD, bool ID, 2943 bool ContainsUnexpandedParameterPack, 2944 SourceLocation qloc, 2945 SourceLocation cloc) 2946 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 2947 QuestionLoc(qloc), ColonLoc(cloc) {} 2948 2949 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2950 : Expr(SC, Empty) { } 2951 2952public: 2953 // getCond - Return the expression representing the condition for 2954 // the ?: operator. 2955 Expr *getCond() const; 2956 2957 // getTrueExpr - Return the subexpression representing the value of 2958 // the expression if the condition evaluates to true. 2959 Expr *getTrueExpr() const; 2960 2961 // getFalseExpr - Return the subexpression representing the value of 2962 // the expression if the condition evaluates to false. This is 2963 // the same as getRHS. 2964 Expr *getFalseExpr() const; 2965 2966 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2967 SourceLocation getColonLoc() const { return ColonLoc; } 2968 2969 static bool classof(const Stmt *T) { 2970 return T->getStmtClass() == ConditionalOperatorClass || 2971 T->getStmtClass() == BinaryConditionalOperatorClass; 2972 } 2973 static bool classof(const AbstractConditionalOperator *) { return true; } 2974}; 2975 2976/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2977/// middle" extension is a BinaryConditionalOperator. 2978class ConditionalOperator : public AbstractConditionalOperator { 2979 enum { COND, LHS, RHS, END_EXPR }; 2980 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2981 2982 friend class ASTStmtReader; 2983public: 2984 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2985 SourceLocation CLoc, Expr *rhs, 2986 QualType t, ExprValueKind VK, ExprObjectKind OK) 2987 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 2988 // FIXME: the type of the conditional operator doesn't 2989 // depend on the type of the conditional, but the standard 2990 // seems to imply that it could. File a bug! 2991 (lhs->isTypeDependent() || rhs->isTypeDependent()), 2992 (cond->isValueDependent() || lhs->isValueDependent() || 2993 rhs->isValueDependent()), 2994 (cond->isInstantiationDependent() || 2995 lhs->isInstantiationDependent() || 2996 rhs->isInstantiationDependent()), 2997 (cond->containsUnexpandedParameterPack() || 2998 lhs->containsUnexpandedParameterPack() || 2999 rhs->containsUnexpandedParameterPack()), 3000 QLoc, CLoc) { 3001 SubExprs[COND] = cond; 3002 SubExprs[LHS] = lhs; 3003 SubExprs[RHS] = rhs; 3004 } 3005 3006 /// \brief Build an empty conditional operator. 3007 explicit ConditionalOperator(EmptyShell Empty) 3008 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 3009 3010 // getCond - Return the expression representing the condition for 3011 // the ?: operator. 3012 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3013 3014 // getTrueExpr - Return the subexpression representing the value of 3015 // the expression if the condition evaluates to true. 3016 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3017 3018 // getFalseExpr - Return the subexpression representing the value of 3019 // the expression if the condition evaluates to false. This is 3020 // the same as getRHS. 3021 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3022 3023 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3024 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3025 3026 SourceRange getSourceRange() const { 3027 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 3028 } 3029 static bool classof(const Stmt *T) { 3030 return T->getStmtClass() == ConditionalOperatorClass; 3031 } 3032 static bool classof(const ConditionalOperator *) { return true; } 3033 3034 // Iterators 3035 child_range children() { 3036 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3037 } 3038}; 3039 3040/// BinaryConditionalOperator - The GNU extension to the conditional 3041/// operator which allows the middle operand to be omitted. 3042/// 3043/// This is a different expression kind on the assumption that almost 3044/// every client ends up needing to know that these are different. 3045class BinaryConditionalOperator : public AbstractConditionalOperator { 3046 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3047 3048 /// - the common condition/left-hand-side expression, which will be 3049 /// evaluated as the opaque value 3050 /// - the condition, expressed in terms of the opaque value 3051 /// - the left-hand-side, expressed in terms of the opaque value 3052 /// - the right-hand-side 3053 Stmt *SubExprs[NUM_SUBEXPRS]; 3054 OpaqueValueExpr *OpaqueValue; 3055 3056 friend class ASTStmtReader; 3057public: 3058 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3059 Expr *cond, Expr *lhs, Expr *rhs, 3060 SourceLocation qloc, SourceLocation cloc, 3061 QualType t, ExprValueKind VK, ExprObjectKind OK) 3062 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3063 (common->isTypeDependent() || rhs->isTypeDependent()), 3064 (common->isValueDependent() || rhs->isValueDependent()), 3065 (common->isInstantiationDependent() || 3066 rhs->isInstantiationDependent()), 3067 (common->containsUnexpandedParameterPack() || 3068 rhs->containsUnexpandedParameterPack()), 3069 qloc, cloc), 3070 OpaqueValue(opaqueValue) { 3071 SubExprs[COMMON] = common; 3072 SubExprs[COND] = cond; 3073 SubExprs[LHS] = lhs; 3074 SubExprs[RHS] = rhs; 3075 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value"); 3076 } 3077 3078 /// \brief Build an empty conditional operator. 3079 explicit BinaryConditionalOperator(EmptyShell Empty) 3080 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3081 3082 /// \brief getCommon - Return the common expression, written to the 3083 /// left of the condition. The opaque value will be bound to the 3084 /// result of this expression. 3085 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3086 3087 /// \brief getOpaqueValue - Return the opaque value placeholder. 3088 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3089 3090 /// \brief getCond - Return the condition expression; this is defined 3091 /// in terms of the opaque value. 3092 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3093 3094 /// \brief getTrueExpr - Return the subexpression which will be 3095 /// evaluated if the condition evaluates to true; this is defined 3096 /// in terms of the opaque value. 3097 Expr *getTrueExpr() const { 3098 return cast<Expr>(SubExprs[LHS]); 3099 } 3100 3101 /// \brief getFalseExpr - Return the subexpression which will be 3102 /// evaluated if the condnition evaluates to false; this is 3103 /// defined in terms of the opaque value. 3104 Expr *getFalseExpr() const { 3105 return cast<Expr>(SubExprs[RHS]); 3106 } 3107 3108 SourceRange getSourceRange() const { 3109 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 3110 } 3111 static bool classof(const Stmt *T) { 3112 return T->getStmtClass() == BinaryConditionalOperatorClass; 3113 } 3114 static bool classof(const BinaryConditionalOperator *) { return true; } 3115 3116 // Iterators 3117 child_range children() { 3118 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3119 } 3120}; 3121 3122inline Expr *AbstractConditionalOperator::getCond() const { 3123 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3124 return co->getCond(); 3125 return cast<BinaryConditionalOperator>(this)->getCond(); 3126} 3127 3128inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3129 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3130 return co->getTrueExpr(); 3131 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3132} 3133 3134inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3135 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3136 return co->getFalseExpr(); 3137 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3138} 3139 3140/// AddrLabelExpr - The GNU address of label extension, representing &&label. 3141class AddrLabelExpr : public Expr { 3142 SourceLocation AmpAmpLoc, LabelLoc; 3143 LabelDecl *Label; 3144public: 3145 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3146 QualType t) 3147 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3148 false), 3149 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3150 3151 /// \brief Build an empty address of a label expression. 3152 explicit AddrLabelExpr(EmptyShell Empty) 3153 : Expr(AddrLabelExprClass, Empty) { } 3154 3155 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3156 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3157 SourceLocation getLabelLoc() const { return LabelLoc; } 3158 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3159 3160 SourceRange getSourceRange() const { 3161 return SourceRange(AmpAmpLoc, LabelLoc); 3162 } 3163 3164 LabelDecl *getLabel() const { return Label; } 3165 void setLabel(LabelDecl *L) { Label = L; } 3166 3167 static bool classof(const Stmt *T) { 3168 return T->getStmtClass() == AddrLabelExprClass; 3169 } 3170 static bool classof(const AddrLabelExpr *) { return true; } 3171 3172 // Iterators 3173 child_range children() { return child_range(); } 3174}; 3175 3176/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3177/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3178/// takes the value of the last subexpression. 3179/// 3180/// A StmtExpr is always an r-value; values "returned" out of a 3181/// StmtExpr will be copied. 3182class StmtExpr : public Expr { 3183 Stmt *SubStmt; 3184 SourceLocation LParenLoc, RParenLoc; 3185public: 3186 // FIXME: Does type-dependence need to be computed differently? 3187 // FIXME: Do we need to compute instantiation instantiation-dependence for 3188 // statements? (ugh!) 3189 StmtExpr(CompoundStmt *substmt, QualType T, 3190 SourceLocation lp, SourceLocation rp) : 3191 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3192 T->isDependentType(), false, false, false), 3193 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3194 3195 /// \brief Build an empty statement expression. 3196 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3197 3198 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3199 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3200 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3201 3202 SourceRange getSourceRange() const { 3203 return SourceRange(LParenLoc, RParenLoc); 3204 } 3205 3206 SourceLocation getLParenLoc() const { return LParenLoc; } 3207 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3208 SourceLocation getRParenLoc() const { return RParenLoc; } 3209 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3210 3211 static bool classof(const Stmt *T) { 3212 return T->getStmtClass() == StmtExprClass; 3213 } 3214 static bool classof(const StmtExpr *) { return true; } 3215 3216 // Iterators 3217 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3218}; 3219 3220 3221/// ShuffleVectorExpr - clang-specific builtin-in function 3222/// __builtin_shufflevector. 3223/// This AST node represents a operator that does a constant 3224/// shuffle, similar to LLVM's shufflevector instruction. It takes 3225/// two vectors and a variable number of constant indices, 3226/// and returns the appropriately shuffled vector. 3227class ShuffleVectorExpr : public Expr { 3228 SourceLocation BuiltinLoc, RParenLoc; 3229 3230 // SubExprs - the list of values passed to the __builtin_shufflevector 3231 // function. The first two are vectors, and the rest are constant 3232 // indices. The number of values in this list is always 3233 // 2+the number of indices in the vector type. 3234 Stmt **SubExprs; 3235 unsigned NumExprs; 3236 3237public: 3238 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3239 QualType Type, SourceLocation BLoc, 3240 SourceLocation RP); 3241 3242 /// \brief Build an empty vector-shuffle expression. 3243 explicit ShuffleVectorExpr(EmptyShell Empty) 3244 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3245 3246 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3247 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3248 3249 SourceLocation getRParenLoc() const { return RParenLoc; } 3250 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3251 3252 SourceRange getSourceRange() const { 3253 return SourceRange(BuiltinLoc, RParenLoc); 3254 } 3255 static bool classof(const Stmt *T) { 3256 return T->getStmtClass() == ShuffleVectorExprClass; 3257 } 3258 static bool classof(const ShuffleVectorExpr *) { return true; } 3259 3260 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3261 /// constant expression, the actual arguments passed in, and the function 3262 /// pointers. 3263 unsigned getNumSubExprs() const { return NumExprs; } 3264 3265 /// \brief Retrieve the array of expressions. 3266 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3267 3268 /// getExpr - Return the Expr at the specified index. 3269 Expr *getExpr(unsigned Index) { 3270 assert((Index < NumExprs) && "Arg access out of range!"); 3271 return cast<Expr>(SubExprs[Index]); 3272 } 3273 const Expr *getExpr(unsigned Index) const { 3274 assert((Index < NumExprs) && "Arg access out of range!"); 3275 return cast<Expr>(SubExprs[Index]); 3276 } 3277 3278 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3279 3280 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3281 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3282 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3283 } 3284 3285 // Iterators 3286 child_range children() { 3287 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3288 } 3289}; 3290 3291/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3292/// This AST node is similar to the conditional operator (?:) in C, with 3293/// the following exceptions: 3294/// - the test expression must be a integer constant expression. 3295/// - the expression returned acts like the chosen subexpression in every 3296/// visible way: the type is the same as that of the chosen subexpression, 3297/// and all predicates (whether it's an l-value, whether it's an integer 3298/// constant expression, etc.) return the same result as for the chosen 3299/// sub-expression. 3300class ChooseExpr : public Expr { 3301 enum { COND, LHS, RHS, END_EXPR }; 3302 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3303 SourceLocation BuiltinLoc, RParenLoc; 3304public: 3305 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3306 QualType t, ExprValueKind VK, ExprObjectKind OK, 3307 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3308 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3309 (cond->isInstantiationDependent() || 3310 lhs->isInstantiationDependent() || 3311 rhs->isInstantiationDependent()), 3312 (cond->containsUnexpandedParameterPack() || 3313 lhs->containsUnexpandedParameterPack() || 3314 rhs->containsUnexpandedParameterPack())), 3315 BuiltinLoc(BLoc), RParenLoc(RP) { 3316 SubExprs[COND] = cond; 3317 SubExprs[LHS] = lhs; 3318 SubExprs[RHS] = rhs; 3319 } 3320 3321 /// \brief Build an empty __builtin_choose_expr. 3322 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3323 3324 /// isConditionTrue - Return whether the condition is true (i.e. not 3325 /// equal to zero). 3326 bool isConditionTrue(const ASTContext &C) const; 3327 3328 /// getChosenSubExpr - Return the subexpression chosen according to the 3329 /// condition. 3330 Expr *getChosenSubExpr(const ASTContext &C) const { 3331 return isConditionTrue(C) ? getLHS() : getRHS(); 3332 } 3333 3334 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3335 void setCond(Expr *E) { SubExprs[COND] = E; } 3336 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3337 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3338 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3339 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3340 3341 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3342 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3343 3344 SourceLocation getRParenLoc() const { return RParenLoc; } 3345 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3346 3347 SourceRange getSourceRange() const { 3348 return SourceRange(BuiltinLoc, RParenLoc); 3349 } 3350 static bool classof(const Stmt *T) { 3351 return T->getStmtClass() == ChooseExprClass; 3352 } 3353 static bool classof(const ChooseExpr *) { return true; } 3354 3355 // Iterators 3356 child_range children() { 3357 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3358 } 3359}; 3360 3361/// GNUNullExpr - Implements the GNU __null extension, which is a name 3362/// for a null pointer constant that has integral type (e.g., int or 3363/// long) and is the same size and alignment as a pointer. The __null 3364/// extension is typically only used by system headers, which define 3365/// NULL as __null in C++ rather than using 0 (which is an integer 3366/// that may not match the size of a pointer). 3367class GNUNullExpr : public Expr { 3368 /// TokenLoc - The location of the __null keyword. 3369 SourceLocation TokenLoc; 3370 3371public: 3372 GNUNullExpr(QualType Ty, SourceLocation Loc) 3373 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3374 false), 3375 TokenLoc(Loc) { } 3376 3377 /// \brief Build an empty GNU __null expression. 3378 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3379 3380 /// getTokenLocation - The location of the __null token. 3381 SourceLocation getTokenLocation() const { return TokenLoc; } 3382 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3383 3384 SourceRange getSourceRange() const { 3385 return SourceRange(TokenLoc); 3386 } 3387 static bool classof(const Stmt *T) { 3388 return T->getStmtClass() == GNUNullExprClass; 3389 } 3390 static bool classof(const GNUNullExpr *) { return true; } 3391 3392 // Iterators 3393 child_range children() { return child_range(); } 3394}; 3395 3396/// VAArgExpr, used for the builtin function __builtin_va_arg. 3397class VAArgExpr : public Expr { 3398 Stmt *Val; 3399 TypeSourceInfo *TInfo; 3400 SourceLocation BuiltinLoc, RParenLoc; 3401public: 3402 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3403 SourceLocation RPLoc, QualType t) 3404 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3405 t->isDependentType(), false, 3406 (TInfo->getType()->isInstantiationDependentType() || 3407 e->isInstantiationDependent()), 3408 (TInfo->getType()->containsUnexpandedParameterPack() || 3409 e->containsUnexpandedParameterPack())), 3410 Val(e), TInfo(TInfo), 3411 BuiltinLoc(BLoc), 3412 RParenLoc(RPLoc) { } 3413 3414 /// \brief Create an empty __builtin_va_arg expression. 3415 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3416 3417 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3418 Expr *getSubExpr() { return cast<Expr>(Val); } 3419 void setSubExpr(Expr *E) { Val = E; } 3420 3421 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3422 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3423 3424 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3425 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3426 3427 SourceLocation getRParenLoc() const { return RParenLoc; } 3428 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3429 3430 SourceRange getSourceRange() const { 3431 return SourceRange(BuiltinLoc, RParenLoc); 3432 } 3433 static bool classof(const Stmt *T) { 3434 return T->getStmtClass() == VAArgExprClass; 3435 } 3436 static bool classof(const VAArgExpr *) { return true; } 3437 3438 // Iterators 3439 child_range children() { return child_range(&Val, &Val+1); } 3440}; 3441 3442/// @brief Describes an C or C++ initializer list. 3443/// 3444/// InitListExpr describes an initializer list, which can be used to 3445/// initialize objects of different types, including 3446/// struct/class/union types, arrays, and vectors. For example: 3447/// 3448/// @code 3449/// struct foo x = { 1, { 2, 3 } }; 3450/// @endcode 3451/// 3452/// Prior to semantic analysis, an initializer list will represent the 3453/// initializer list as written by the user, but will have the 3454/// placeholder type "void". This initializer list is called the 3455/// syntactic form of the initializer, and may contain C99 designated 3456/// initializers (represented as DesignatedInitExprs), initializations 3457/// of subobject members without explicit braces, and so on. Clients 3458/// interested in the original syntax of the initializer list should 3459/// use the syntactic form of the initializer list. 3460/// 3461/// After semantic analysis, the initializer list will represent the 3462/// semantic form of the initializer, where the initializations of all 3463/// subobjects are made explicit with nested InitListExpr nodes and 3464/// C99 designators have been eliminated by placing the designated 3465/// initializations into the subobject they initialize. Additionally, 3466/// any "holes" in the initialization, where no initializer has been 3467/// specified for a particular subobject, will be replaced with 3468/// implicitly-generated ImplicitValueInitExpr expressions that 3469/// value-initialize the subobjects. Note, however, that the 3470/// initializer lists may still have fewer initializers than there are 3471/// elements to initialize within the object. 3472/// 3473/// Given the semantic form of the initializer list, one can retrieve 3474/// the original syntactic form of that initializer list (if it 3475/// exists) using getSyntacticForm(). Since many initializer lists 3476/// have the same syntactic and semantic forms, getSyntacticForm() may 3477/// return NULL, indicating that the current initializer list also 3478/// serves as its syntactic form. 3479class InitListExpr : public Expr { 3480 // FIXME: Eliminate this vector in favor of ASTContext allocation 3481 typedef ASTVector<Stmt *> InitExprsTy; 3482 InitExprsTy InitExprs; 3483 SourceLocation LBraceLoc, RBraceLoc; 3484 3485 /// Contains the initializer list that describes the syntactic form 3486 /// written in the source code. 3487 InitListExpr *SyntacticForm; 3488 3489 /// \brief Either: 3490 /// If this initializer list initializes an array with more elements than 3491 /// there are initializers in the list, specifies an expression to be used 3492 /// for value initialization of the rest of the elements. 3493 /// Or 3494 /// If this initializer list initializes a union, specifies which 3495 /// field within the union will be initialized. 3496 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3497 3498public: 3499 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3500 Expr **initexprs, unsigned numinits, 3501 SourceLocation rbraceloc); 3502 3503 /// \brief Build an empty initializer list. 3504 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3505 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3506 3507 unsigned getNumInits() const { return InitExprs.size(); } 3508 3509 /// \brief Retrieve the set of initializers. 3510 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3511 3512 const Expr *getInit(unsigned Init) const { 3513 assert(Init < getNumInits() && "Initializer access out of range!"); 3514 return cast_or_null<Expr>(InitExprs[Init]); 3515 } 3516 3517 Expr *getInit(unsigned Init) { 3518 assert(Init < getNumInits() && "Initializer access out of range!"); 3519 return cast_or_null<Expr>(InitExprs[Init]); 3520 } 3521 3522 void setInit(unsigned Init, Expr *expr) { 3523 assert(Init < getNumInits() && "Initializer access out of range!"); 3524 InitExprs[Init] = expr; 3525 } 3526 3527 /// \brief Reserve space for some number of initializers. 3528 void reserveInits(ASTContext &C, unsigned NumInits); 3529 3530 /// @brief Specify the number of initializers 3531 /// 3532 /// If there are more than @p NumInits initializers, the remaining 3533 /// initializers will be destroyed. If there are fewer than @p 3534 /// NumInits initializers, NULL expressions will be added for the 3535 /// unknown initializers. 3536 void resizeInits(ASTContext &Context, unsigned NumInits); 3537 3538 /// @brief Updates the initializer at index @p Init with the new 3539 /// expression @p expr, and returns the old expression at that 3540 /// location. 3541 /// 3542 /// When @p Init is out of range for this initializer list, the 3543 /// initializer list will be extended with NULL expressions to 3544 /// accommodate the new entry. 3545 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3546 3547 /// \brief If this initializer list initializes an array with more elements 3548 /// than there are initializers in the list, specifies an expression to be 3549 /// used for value initialization of the rest of the elements. 3550 Expr *getArrayFiller() { 3551 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3552 } 3553 const Expr *getArrayFiller() const { 3554 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3555 } 3556 void setArrayFiller(Expr *filler); 3557 3558 /// \brief Return true if this is an array initializer and its array "filler" 3559 /// has been set. 3560 bool hasArrayFiller() const { return getArrayFiller(); } 3561 3562 /// \brief If this initializes a union, specifies which field in the 3563 /// union to initialize. 3564 /// 3565 /// Typically, this field is the first named field within the 3566 /// union. However, a designated initializer can specify the 3567 /// initialization of a different field within the union. 3568 FieldDecl *getInitializedFieldInUnion() { 3569 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3570 } 3571 const FieldDecl *getInitializedFieldInUnion() const { 3572 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3573 } 3574 void setInitializedFieldInUnion(FieldDecl *FD) { 3575 ArrayFillerOrUnionFieldInit = FD; 3576 } 3577 3578 // Explicit InitListExpr's originate from source code (and have valid source 3579 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3580 bool isExplicit() { 3581 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3582 } 3583 3584 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3585 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3586 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3587 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3588 3589 /// @brief Retrieve the initializer list that describes the 3590 /// syntactic form of the initializer. 3591 /// 3592 /// 3593 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3594 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3595 3596 bool hadArrayRangeDesignator() const { 3597 return InitListExprBits.HadArrayRangeDesignator != 0; 3598 } 3599 void sawArrayRangeDesignator(bool ARD = true) { 3600 InitListExprBits.HadArrayRangeDesignator = ARD; 3601 } 3602 3603 bool initializesStdInitializerList() const { 3604 return InitListExprBits.InitializesStdInitializerList != 0; 3605 } 3606 void setInitializesStdInitializerList(bool ISIL = true) { 3607 InitListExprBits.InitializesStdInitializerList = ISIL; 3608 } 3609 3610 SourceRange getSourceRange() const; 3611 3612 static bool classof(const Stmt *T) { 3613 return T->getStmtClass() == InitListExprClass; 3614 } 3615 static bool classof(const InitListExpr *) { return true; } 3616 3617 // Iterators 3618 child_range children() { 3619 if (InitExprs.empty()) return child_range(); 3620 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3621 } 3622 3623 typedef InitExprsTy::iterator iterator; 3624 typedef InitExprsTy::const_iterator const_iterator; 3625 typedef InitExprsTy::reverse_iterator reverse_iterator; 3626 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3627 3628 iterator begin() { return InitExprs.begin(); } 3629 const_iterator begin() const { return InitExprs.begin(); } 3630 iterator end() { return InitExprs.end(); } 3631 const_iterator end() const { return InitExprs.end(); } 3632 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3633 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3634 reverse_iterator rend() { return InitExprs.rend(); } 3635 const_reverse_iterator rend() const { return InitExprs.rend(); } 3636 3637 friend class ASTStmtReader; 3638 friend class ASTStmtWriter; 3639}; 3640 3641/// @brief Represents a C99 designated initializer expression. 3642/// 3643/// A designated initializer expression (C99 6.7.8) contains one or 3644/// more designators (which can be field designators, array 3645/// designators, or GNU array-range designators) followed by an 3646/// expression that initializes the field or element(s) that the 3647/// designators refer to. For example, given: 3648/// 3649/// @code 3650/// struct point { 3651/// double x; 3652/// double y; 3653/// }; 3654/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3655/// @endcode 3656/// 3657/// The InitListExpr contains three DesignatedInitExprs, the first of 3658/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3659/// designators, one array designator for @c [2] followed by one field 3660/// designator for @c .y. The initalization expression will be 1.0. 3661class DesignatedInitExpr : public Expr { 3662public: 3663 /// \brief Forward declaration of the Designator class. 3664 class Designator; 3665 3666private: 3667 /// The location of the '=' or ':' prior to the actual initializer 3668 /// expression. 3669 SourceLocation EqualOrColonLoc; 3670 3671 /// Whether this designated initializer used the GNU deprecated 3672 /// syntax rather than the C99 '=' syntax. 3673 bool GNUSyntax : 1; 3674 3675 /// The number of designators in this initializer expression. 3676 unsigned NumDesignators : 15; 3677 3678 /// The number of subexpressions of this initializer expression, 3679 /// which contains both the initializer and any additional 3680 /// expressions used by array and array-range designators. 3681 unsigned NumSubExprs : 16; 3682 3683 /// \brief The designators in this designated initialization 3684 /// expression. 3685 Designator *Designators; 3686 3687 3688 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3689 const Designator *Designators, 3690 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3691 Expr **IndexExprs, unsigned NumIndexExprs, 3692 Expr *Init); 3693 3694 explicit DesignatedInitExpr(unsigned NumSubExprs) 3695 : Expr(DesignatedInitExprClass, EmptyShell()), 3696 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(0) { } 3697 3698public: 3699 /// A field designator, e.g., ".x". 3700 struct FieldDesignator { 3701 /// Refers to the field that is being initialized. The low bit 3702 /// of this field determines whether this is actually a pointer 3703 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3704 /// initially constructed, a field designator will store an 3705 /// IdentifierInfo*. After semantic analysis has resolved that 3706 /// name, the field designator will instead store a FieldDecl*. 3707 uintptr_t NameOrField; 3708 3709 /// The location of the '.' in the designated initializer. 3710 unsigned DotLoc; 3711 3712 /// The location of the field name in the designated initializer. 3713 unsigned FieldLoc; 3714 }; 3715 3716 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3717 struct ArrayOrRangeDesignator { 3718 /// Location of the first index expression within the designated 3719 /// initializer expression's list of subexpressions. 3720 unsigned Index; 3721 /// The location of the '[' starting the array range designator. 3722 unsigned LBracketLoc; 3723 /// The location of the ellipsis separating the start and end 3724 /// indices. Only valid for GNU array-range designators. 3725 unsigned EllipsisLoc; 3726 /// The location of the ']' terminating the array range designator. 3727 unsigned RBracketLoc; 3728 }; 3729 3730 /// @brief Represents a single C99 designator. 3731 /// 3732 /// @todo This class is infuriatingly similar to clang::Designator, 3733 /// but minor differences (storing indices vs. storing pointers) 3734 /// keep us from reusing it. Try harder, later, to rectify these 3735 /// differences. 3736 class Designator { 3737 /// @brief The kind of designator this describes. 3738 enum { 3739 FieldDesignator, 3740 ArrayDesignator, 3741 ArrayRangeDesignator 3742 } Kind; 3743 3744 union { 3745 /// A field designator, e.g., ".x". 3746 struct FieldDesignator Field; 3747 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3748 struct ArrayOrRangeDesignator ArrayOrRange; 3749 }; 3750 friend class DesignatedInitExpr; 3751 3752 public: 3753 Designator() {} 3754 3755 /// @brief Initializes a field designator. 3756 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3757 SourceLocation FieldLoc) 3758 : Kind(FieldDesignator) { 3759 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3760 Field.DotLoc = DotLoc.getRawEncoding(); 3761 Field.FieldLoc = FieldLoc.getRawEncoding(); 3762 } 3763 3764 /// @brief Initializes an array designator. 3765 Designator(unsigned Index, SourceLocation LBracketLoc, 3766 SourceLocation RBracketLoc) 3767 : Kind(ArrayDesignator) { 3768 ArrayOrRange.Index = Index; 3769 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3770 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3771 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3772 } 3773 3774 /// @brief Initializes a GNU array-range designator. 3775 Designator(unsigned Index, SourceLocation LBracketLoc, 3776 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3777 : Kind(ArrayRangeDesignator) { 3778 ArrayOrRange.Index = Index; 3779 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3780 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3781 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3782 } 3783 3784 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3785 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3786 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3787 3788 IdentifierInfo *getFieldName() const; 3789 3790 FieldDecl *getField() const { 3791 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3792 if (Field.NameOrField & 0x01) 3793 return 0; 3794 else 3795 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3796 } 3797 3798 void setField(FieldDecl *FD) { 3799 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3800 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3801 } 3802 3803 SourceLocation getDotLoc() const { 3804 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3805 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3806 } 3807 3808 SourceLocation getFieldLoc() const { 3809 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3810 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3811 } 3812 3813 SourceLocation getLBracketLoc() const { 3814 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3815 "Only valid on an array or array-range designator"); 3816 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3817 } 3818 3819 SourceLocation getRBracketLoc() const { 3820 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3821 "Only valid on an array or array-range designator"); 3822 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3823 } 3824 3825 SourceLocation getEllipsisLoc() const { 3826 assert(Kind == ArrayRangeDesignator && 3827 "Only valid on an array-range designator"); 3828 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3829 } 3830 3831 unsigned getFirstExprIndex() const { 3832 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3833 "Only valid on an array or array-range designator"); 3834 return ArrayOrRange.Index; 3835 } 3836 3837 SourceLocation getStartLocation() const { 3838 if (Kind == FieldDesignator) 3839 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3840 else 3841 return getLBracketLoc(); 3842 } 3843 SourceLocation getEndLocation() const { 3844 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3845 } 3846 SourceRange getSourceRange() const { 3847 return SourceRange(getStartLocation(), getEndLocation()); 3848 } 3849 }; 3850 3851 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3852 unsigned NumDesignators, 3853 Expr **IndexExprs, unsigned NumIndexExprs, 3854 SourceLocation EqualOrColonLoc, 3855 bool GNUSyntax, Expr *Init); 3856 3857 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3858 3859 /// @brief Returns the number of designators in this initializer. 3860 unsigned size() const { return NumDesignators; } 3861 3862 // Iterator access to the designators. 3863 typedef Designator *designators_iterator; 3864 designators_iterator designators_begin() { return Designators; } 3865 designators_iterator designators_end() { 3866 return Designators + NumDesignators; 3867 } 3868 3869 typedef const Designator *const_designators_iterator; 3870 const_designators_iterator designators_begin() const { return Designators; } 3871 const_designators_iterator designators_end() const { 3872 return Designators + NumDesignators; 3873 } 3874 3875 typedef std::reverse_iterator<designators_iterator> 3876 reverse_designators_iterator; 3877 reverse_designators_iterator designators_rbegin() { 3878 return reverse_designators_iterator(designators_end()); 3879 } 3880 reverse_designators_iterator designators_rend() { 3881 return reverse_designators_iterator(designators_begin()); 3882 } 3883 3884 typedef std::reverse_iterator<const_designators_iterator> 3885 const_reverse_designators_iterator; 3886 const_reverse_designators_iterator designators_rbegin() const { 3887 return const_reverse_designators_iterator(designators_end()); 3888 } 3889 const_reverse_designators_iterator designators_rend() const { 3890 return const_reverse_designators_iterator(designators_begin()); 3891 } 3892 3893 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3894 3895 void setDesignators(ASTContext &C, const Designator *Desigs, 3896 unsigned NumDesigs); 3897 3898 Expr *getArrayIndex(const Designator& D); 3899 Expr *getArrayRangeStart(const Designator& D); 3900 Expr *getArrayRangeEnd(const Designator& D); 3901 3902 /// @brief Retrieve the location of the '=' that precedes the 3903 /// initializer value itself, if present. 3904 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3905 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3906 3907 /// @brief Determines whether this designated initializer used the 3908 /// deprecated GNU syntax for designated initializers. 3909 bool usesGNUSyntax() const { return GNUSyntax; } 3910 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3911 3912 /// @brief Retrieve the initializer value. 3913 Expr *getInit() const { 3914 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3915 } 3916 3917 void setInit(Expr *init) { 3918 *child_begin() = init; 3919 } 3920 3921 /// \brief Retrieve the total number of subexpressions in this 3922 /// designated initializer expression, including the actual 3923 /// initialized value and any expressions that occur within array 3924 /// and array-range designators. 3925 unsigned getNumSubExprs() const { return NumSubExprs; } 3926 3927 Expr *getSubExpr(unsigned Idx) { 3928 assert(Idx < NumSubExprs && "Subscript out of range"); 3929 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3930 Ptr += sizeof(DesignatedInitExpr); 3931 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3932 } 3933 3934 void setSubExpr(unsigned Idx, Expr *E) { 3935 assert(Idx < NumSubExprs && "Subscript out of range"); 3936 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3937 Ptr += sizeof(DesignatedInitExpr); 3938 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3939 } 3940 3941 /// \brief Replaces the designator at index @p Idx with the series 3942 /// of designators in [First, Last). 3943 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3944 const Designator *Last); 3945 3946 SourceRange getDesignatorsSourceRange() const; 3947 3948 SourceRange getSourceRange() const; 3949 3950 static bool classof(const Stmt *T) { 3951 return T->getStmtClass() == DesignatedInitExprClass; 3952 } 3953 static bool classof(const DesignatedInitExpr *) { return true; } 3954 3955 // Iterators 3956 child_range children() { 3957 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3958 return child_range(begin, begin + NumSubExprs); 3959 } 3960}; 3961 3962/// \brief Represents an implicitly-generated value initialization of 3963/// an object of a given type. 3964/// 3965/// Implicit value initializations occur within semantic initializer 3966/// list expressions (InitListExpr) as placeholders for subobject 3967/// initializations not explicitly specified by the user. 3968/// 3969/// \see InitListExpr 3970class ImplicitValueInitExpr : public Expr { 3971public: 3972 explicit ImplicitValueInitExpr(QualType ty) 3973 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3974 false, false, ty->isInstantiationDependentType(), false) { } 3975 3976 /// \brief Construct an empty implicit value initialization. 3977 explicit ImplicitValueInitExpr(EmptyShell Empty) 3978 : Expr(ImplicitValueInitExprClass, Empty) { } 3979 3980 static bool classof(const Stmt *T) { 3981 return T->getStmtClass() == ImplicitValueInitExprClass; 3982 } 3983 static bool classof(const ImplicitValueInitExpr *) { return true; } 3984 3985 SourceRange getSourceRange() const { 3986 return SourceRange(); 3987 } 3988 3989 // Iterators 3990 child_range children() { return child_range(); } 3991}; 3992 3993 3994class ParenListExpr : public Expr { 3995 Stmt **Exprs; 3996 unsigned NumExprs; 3997 SourceLocation LParenLoc, RParenLoc; 3998 3999public: 4000 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 4001 unsigned numexprs, SourceLocation rparenloc); 4002 4003 /// \brief Build an empty paren list. 4004 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 4005 4006 unsigned getNumExprs() const { return NumExprs; } 4007 4008 const Expr* getExpr(unsigned Init) const { 4009 assert(Init < getNumExprs() && "Initializer access out of range!"); 4010 return cast_or_null<Expr>(Exprs[Init]); 4011 } 4012 4013 Expr* getExpr(unsigned Init) { 4014 assert(Init < getNumExprs() && "Initializer access out of range!"); 4015 return cast_or_null<Expr>(Exprs[Init]); 4016 } 4017 4018 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 4019 4020 SourceLocation getLParenLoc() const { return LParenLoc; } 4021 SourceLocation getRParenLoc() const { return RParenLoc; } 4022 4023 SourceRange getSourceRange() const { 4024 return SourceRange(LParenLoc, RParenLoc); 4025 } 4026 static bool classof(const Stmt *T) { 4027 return T->getStmtClass() == ParenListExprClass; 4028 } 4029 static bool classof(const ParenListExpr *) { return true; } 4030 4031 // Iterators 4032 child_range children() { 4033 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4034 } 4035 4036 friend class ASTStmtReader; 4037 friend class ASTStmtWriter; 4038}; 4039 4040 4041/// \brief Represents a C11 generic selection. 4042/// 4043/// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4044/// expression, followed by one or more generic associations. Each generic 4045/// association specifies a type name and an expression, or "default" and an 4046/// expression (in which case it is known as a default generic association). 4047/// The type and value of the generic selection are identical to those of its 4048/// result expression, which is defined as the expression in the generic 4049/// association with a type name that is compatible with the type of the 4050/// controlling expression, or the expression in the default generic association 4051/// if no types are compatible. For example: 4052/// 4053/// @code 4054/// _Generic(X, double: 1, float: 2, default: 3) 4055/// @endcode 4056/// 4057/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4058/// or 3 if "hello". 4059/// 4060/// As an extension, generic selections are allowed in C++, where the following 4061/// additional semantics apply: 4062/// 4063/// Any generic selection whose controlling expression is type-dependent or 4064/// which names a dependent type in its association list is result-dependent, 4065/// which means that the choice of result expression is dependent. 4066/// Result-dependent generic associations are both type- and value-dependent. 4067class GenericSelectionExpr : public Expr { 4068 enum { CONTROLLING, END_EXPR }; 4069 TypeSourceInfo **AssocTypes; 4070 Stmt **SubExprs; 4071 unsigned NumAssocs, ResultIndex; 4072 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4073 4074public: 4075 GenericSelectionExpr(ASTContext &Context, 4076 SourceLocation GenericLoc, Expr *ControllingExpr, 4077 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4078 unsigned NumAssocs, SourceLocation DefaultLoc, 4079 SourceLocation RParenLoc, 4080 bool ContainsUnexpandedParameterPack, 4081 unsigned ResultIndex); 4082 4083 /// This constructor is used in the result-dependent case. 4084 GenericSelectionExpr(ASTContext &Context, 4085 SourceLocation GenericLoc, Expr *ControllingExpr, 4086 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4087 unsigned NumAssocs, SourceLocation DefaultLoc, 4088 SourceLocation RParenLoc, 4089 bool ContainsUnexpandedParameterPack); 4090 4091 explicit GenericSelectionExpr(EmptyShell Empty) 4092 : Expr(GenericSelectionExprClass, Empty) { } 4093 4094 unsigned getNumAssocs() const { return NumAssocs; } 4095 4096 SourceLocation getGenericLoc() const { return GenericLoc; } 4097 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4098 SourceLocation getRParenLoc() const { return RParenLoc; } 4099 4100 const Expr *getAssocExpr(unsigned i) const { 4101 return cast<Expr>(SubExprs[END_EXPR+i]); 4102 } 4103 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4104 4105 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4106 return AssocTypes[i]; 4107 } 4108 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4109 4110 QualType getAssocType(unsigned i) const { 4111 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4112 return TS->getType(); 4113 else 4114 return QualType(); 4115 } 4116 4117 const Expr *getControllingExpr() const { 4118 return cast<Expr>(SubExprs[CONTROLLING]); 4119 } 4120 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4121 4122 /// Whether this generic selection is result-dependent. 4123 bool isResultDependent() const { return ResultIndex == -1U; } 4124 4125 /// The zero-based index of the result expression's generic association in 4126 /// the generic selection's association list. Defined only if the 4127 /// generic selection is not result-dependent. 4128 unsigned getResultIndex() const { 4129 assert(!isResultDependent() && "Generic selection is result-dependent"); 4130 return ResultIndex; 4131 } 4132 4133 /// The generic selection's result expression. Defined only if the 4134 /// generic selection is not result-dependent. 4135 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4136 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4137 4138 SourceRange getSourceRange() const { 4139 return SourceRange(GenericLoc, RParenLoc); 4140 } 4141 static bool classof(const Stmt *T) { 4142 return T->getStmtClass() == GenericSelectionExprClass; 4143 } 4144 static bool classof(const GenericSelectionExpr *) { return true; } 4145 4146 child_range children() { 4147 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4148 } 4149 4150 friend class ASTStmtReader; 4151}; 4152 4153//===----------------------------------------------------------------------===// 4154// Clang Extensions 4155//===----------------------------------------------------------------------===// 4156 4157 4158/// ExtVectorElementExpr - This represents access to specific elements of a 4159/// vector, and may occur on the left hand side or right hand side. For example 4160/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4161/// 4162/// Note that the base may have either vector or pointer to vector type, just 4163/// like a struct field reference. 4164/// 4165class ExtVectorElementExpr : public Expr { 4166 Stmt *Base; 4167 IdentifierInfo *Accessor; 4168 SourceLocation AccessorLoc; 4169public: 4170 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4171 IdentifierInfo &accessor, SourceLocation loc) 4172 : Expr(ExtVectorElementExprClass, ty, VK, 4173 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4174 base->isTypeDependent(), base->isValueDependent(), 4175 base->isInstantiationDependent(), 4176 base->containsUnexpandedParameterPack()), 4177 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4178 4179 /// \brief Build an empty vector element expression. 4180 explicit ExtVectorElementExpr(EmptyShell Empty) 4181 : Expr(ExtVectorElementExprClass, Empty) { } 4182 4183 const Expr *getBase() const { return cast<Expr>(Base); } 4184 Expr *getBase() { return cast<Expr>(Base); } 4185 void setBase(Expr *E) { Base = E; } 4186 4187 IdentifierInfo &getAccessor() const { return *Accessor; } 4188 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4189 4190 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4191 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4192 4193 /// getNumElements - Get the number of components being selected. 4194 unsigned getNumElements() const; 4195 4196 /// containsDuplicateElements - Return true if any element access is 4197 /// repeated. 4198 bool containsDuplicateElements() const; 4199 4200 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4201 /// aggregate Constant of ConstantInt(s). 4202 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4203 4204 SourceRange getSourceRange() const { 4205 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4206 } 4207 4208 /// isArrow - Return true if the base expression is a pointer to vector, 4209 /// return false if the base expression is a vector. 4210 bool isArrow() const; 4211 4212 static bool classof(const Stmt *T) { 4213 return T->getStmtClass() == ExtVectorElementExprClass; 4214 } 4215 static bool classof(const ExtVectorElementExpr *) { return true; } 4216 4217 // Iterators 4218 child_range children() { return child_range(&Base, &Base+1); } 4219}; 4220 4221 4222/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4223/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4224class BlockExpr : public Expr { 4225protected: 4226 BlockDecl *TheBlock; 4227public: 4228 BlockExpr(BlockDecl *BD, QualType ty) 4229 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4230 ty->isDependentType(), ty->isDependentType(), 4231 ty->isInstantiationDependentType() || BD->isDependentContext(), 4232 false), 4233 TheBlock(BD) {} 4234 4235 /// \brief Build an empty block expression. 4236 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4237 4238 const BlockDecl *getBlockDecl() const { return TheBlock; } 4239 BlockDecl *getBlockDecl() { return TheBlock; } 4240 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4241 4242 // Convenience functions for probing the underlying BlockDecl. 4243 SourceLocation getCaretLocation() const; 4244 const Stmt *getBody() const; 4245 Stmt *getBody(); 4246 4247 SourceRange getSourceRange() const { 4248 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4249 } 4250 4251 /// getFunctionType - Return the underlying function type for this block. 4252 const FunctionProtoType *getFunctionType() const; 4253 4254 static bool classof(const Stmt *T) { 4255 return T->getStmtClass() == BlockExprClass; 4256 } 4257 static bool classof(const BlockExpr *) { return true; } 4258 4259 // Iterators 4260 child_range children() { return child_range(); } 4261}; 4262 4263/// BlockDeclRefExpr - A reference to a local variable declared in an 4264/// enclosing scope. 4265class BlockDeclRefExpr : public Expr { 4266 VarDecl *D; 4267 SourceLocation Loc; 4268 bool IsByRef : 1; 4269 bool ConstQualAdded : 1; 4270public: 4271 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 4272 SourceLocation l, bool ByRef, bool constAdded = false); 4273 4274 // \brief Build an empty reference to a declared variable in a 4275 // block. 4276 explicit BlockDeclRefExpr(EmptyShell Empty) 4277 : Expr(BlockDeclRefExprClass, Empty) { } 4278 4279 VarDecl *getDecl() { return D; } 4280 const VarDecl *getDecl() const { return D; } 4281 void setDecl(VarDecl *VD) { D = VD; } 4282 4283 SourceLocation getLocation() const { return Loc; } 4284 void setLocation(SourceLocation L) { Loc = L; } 4285 4286 SourceRange getSourceRange() const { return SourceRange(Loc); } 4287 4288 bool isByRef() const { return IsByRef; } 4289 void setByRef(bool BR) { IsByRef = BR; } 4290 4291 bool isConstQualAdded() const { return ConstQualAdded; } 4292 void setConstQualAdded(bool C) { ConstQualAdded = C; } 4293 4294 static bool classof(const Stmt *T) { 4295 return T->getStmtClass() == BlockDeclRefExprClass; 4296 } 4297 static bool classof(const BlockDeclRefExpr *) { return true; } 4298 4299 // Iterators 4300 child_range children() { return child_range(); } 4301}; 4302 4303/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4304/// This AST node provides support for reinterpreting a type to another 4305/// type of the same size. 4306class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4307private: 4308 Stmt *SrcExpr; 4309 SourceLocation BuiltinLoc, RParenLoc; 4310 4311 friend class ASTReader; 4312 friend class ASTStmtReader; 4313 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4314 4315public: 4316 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4317 ExprValueKind VK, ExprObjectKind OK, 4318 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4319 : Expr(AsTypeExprClass, DstType, VK, OK, 4320 DstType->isDependentType(), 4321 DstType->isDependentType() || SrcExpr->isValueDependent(), 4322 (DstType->isInstantiationDependentType() || 4323 SrcExpr->isInstantiationDependent()), 4324 (DstType->containsUnexpandedParameterPack() || 4325 SrcExpr->containsUnexpandedParameterPack())), 4326 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4327 4328 /// getSrcExpr - Return the Expr to be converted. 4329 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4330 4331 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4332 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4333 4334 /// getRParenLoc - Return the location of final right parenthesis. 4335 SourceLocation getRParenLoc() const { return RParenLoc; } 4336 4337 SourceRange getSourceRange() const { 4338 return SourceRange(BuiltinLoc, RParenLoc); 4339 } 4340 4341 static bool classof(const Stmt *T) { 4342 return T->getStmtClass() == AsTypeExprClass; 4343 } 4344 static bool classof(const AsTypeExpr *) { return true; } 4345 4346 // Iterators 4347 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4348}; 4349 4350/// PseudoObjectExpr - An expression which accesses a pseudo-object 4351/// l-value. A pseudo-object is an abstract object, accesses to which 4352/// are translated to calls. The pseudo-object expression has a 4353/// syntactic form, which shows how the expression was actually 4354/// written in the source code, and a semantic form, which is a series 4355/// of expressions to be executed in order which detail how the 4356/// operation is actually evaluated. Optionally, one of the semantic 4357/// forms may also provide a result value for the expression. 4358/// 4359/// If any of the semantic-form expressions is an OpaqueValueExpr, 4360/// that OVE is required to have a source expression, and it is bound 4361/// to the result of that source expression. Such OVEs may appear 4362/// only in subsequent semantic-form expressions and as 4363/// sub-expressions of the syntactic form. 4364/// 4365/// PseudoObjectExpr should be used only when an operation can be 4366/// usefully described in terms of fairly simple rewrite rules on 4367/// objects and functions that are meant to be used by end-developers. 4368/// For example, under the Itanium ABI, dynamic casts are implemented 4369/// as a call to a runtime function called __dynamic_cast; using this 4370/// class to describe that would be inappropriate because that call is 4371/// not really part of the user-visible semantics, and instead the 4372/// cast is properly reflected in the AST and IR-generation has been 4373/// taught to generate the call as necessary. In contrast, an 4374/// Objective-C property access is semantically defined to be 4375/// equivalent to a particular message send, and this is very much 4376/// part of the user model. The name of this class encourages this 4377/// modelling design. 4378class PseudoObjectExpr : public Expr { 4379 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4380 // Always at least two, because the first sub-expression is the 4381 // syntactic form. 4382 4383 // PseudoObjectExprBits.ResultIndex - The index of the 4384 // sub-expression holding the result. 0 means the result is void, 4385 // which is unambiguous because it's the index of the syntactic 4386 // form. Note that this is therefore 1 higher than the value passed 4387 // in to Create, which is an index within the semantic forms. 4388 // Note also that ASTStmtWriter assumes this encoding. 4389 4390 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); } 4391 const Expr * const *getSubExprsBuffer() const { 4392 return reinterpret_cast<const Expr * const *>(this + 1); 4393 } 4394 4395 friend class ASTStmtReader; 4396 4397 PseudoObjectExpr(QualType type, ExprValueKind VK, 4398 Expr *syntactic, ArrayRef<Expr*> semantic, 4399 unsigned resultIndex); 4400 4401 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4402 4403 unsigned getNumSubExprs() const { 4404 return PseudoObjectExprBits.NumSubExprs; 4405 } 4406 4407public: 4408 /// NoResult - A value for the result index indicating that there is 4409 /// no semantic result. 4410 enum { NoResult = ~0U }; 4411 4412 static PseudoObjectExpr *Create(ASTContext &Context, Expr *syntactic, 4413 ArrayRef<Expr*> semantic, 4414 unsigned resultIndex); 4415 4416 static PseudoObjectExpr *Create(ASTContext &Context, EmptyShell shell, 4417 unsigned numSemanticExprs); 4418 4419 /// Return the syntactic form of this expression, i.e. the 4420 /// expression it actually looks like. Likely to be expressed in 4421 /// terms of OpaqueValueExprs bound in the semantic form. 4422 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 4423 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 4424 4425 /// Return the index of the result-bearing expression into the semantics 4426 /// expressions, or PseudoObjectExpr::NoResult if there is none. 4427 unsigned getResultExprIndex() const { 4428 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 4429 return PseudoObjectExprBits.ResultIndex - 1; 4430 } 4431 4432 /// Return the result-bearing expression, or null if there is none. 4433 Expr *getResultExpr() { 4434 if (PseudoObjectExprBits.ResultIndex == 0) 4435 return 0; 4436 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 4437 } 4438 const Expr *getResultExpr() const { 4439 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 4440 } 4441 4442 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 4443 4444 typedef Expr * const *semantics_iterator; 4445 typedef const Expr * const *const_semantics_iterator; 4446 semantics_iterator semantics_begin() { 4447 return getSubExprsBuffer() + 1; 4448 } 4449 const_semantics_iterator semantics_begin() const { 4450 return getSubExprsBuffer() + 1; 4451 } 4452 semantics_iterator semantics_end() { 4453 return getSubExprsBuffer() + getNumSubExprs(); 4454 } 4455 const_semantics_iterator semantics_end() const { 4456 return getSubExprsBuffer() + getNumSubExprs(); 4457 } 4458 Expr *getSemanticExpr(unsigned index) { 4459 assert(index + 1 < getNumSubExprs()); 4460 return getSubExprsBuffer()[index + 1]; 4461 } 4462 const Expr *getSemanticExpr(unsigned index) const { 4463 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 4464 } 4465 4466 SourceLocation getExprLoc() const { 4467 return getSyntacticForm()->getExprLoc(); 4468 } 4469 SourceRange getSourceRange() const { 4470 return getSyntacticForm()->getSourceRange(); 4471 } 4472 4473 child_range children() { 4474 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer()); 4475 return child_range(cs, cs + getNumSubExprs()); 4476 } 4477 4478 static bool classof(const Stmt *T) { 4479 return T->getStmtClass() == PseudoObjectExprClass; 4480 } 4481 static bool classof(const PseudoObjectExpr *) { return true; } 4482}; 4483 4484/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4485/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4486/// similarly-named C++0x instructions. All of these instructions take one 4487/// primary pointer and at least one memory order. 4488class AtomicExpr : public Expr { 4489public: 4490 enum AtomicOp { Load, Store, CmpXchgStrong, CmpXchgWeak, Xchg, 4491 Add, Sub, And, Or, Xor, Init }; 4492private: 4493 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, END_EXPR }; 4494 Stmt* SubExprs[END_EXPR]; 4495 unsigned NumSubExprs; 4496 SourceLocation BuiltinLoc, RParenLoc; 4497 AtomicOp Op; 4498 4499public: 4500 AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, QualType t, 4501 AtomicOp op, SourceLocation RP); 4502 4503 /// \brief Build an empty AtomicExpr. 4504 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4505 4506 Expr *getPtr() const { 4507 return cast<Expr>(SubExprs[PTR]); 4508 } 4509 void setPtr(Expr *E) { 4510 SubExprs[PTR] = E; 4511 } 4512 Expr *getOrder() const { 4513 return cast<Expr>(SubExprs[ORDER]); 4514 } 4515 void setOrder(Expr *E) { 4516 SubExprs[ORDER] = E; 4517 } 4518 Expr *getVal1() const { 4519 if (Op == Init) 4520 return cast<Expr>(SubExprs[ORDER]); 4521 assert(NumSubExprs >= 3); 4522 return cast<Expr>(SubExprs[VAL1]); 4523 } 4524 void setVal1(Expr *E) { 4525 if (Op == Init) { 4526 SubExprs[ORDER] = E; 4527 return; 4528 } 4529 assert(NumSubExprs >= 3); 4530 SubExprs[VAL1] = E; 4531 } 4532 Expr *getOrderFail() const { 4533 assert(NumSubExprs == 5); 4534 return cast<Expr>(SubExprs[ORDER_FAIL]); 4535 } 4536 void setOrderFail(Expr *E) { 4537 assert(NumSubExprs == 5); 4538 SubExprs[ORDER_FAIL] = E; 4539 } 4540 Expr *getVal2() const { 4541 assert(NumSubExprs == 5); 4542 return cast<Expr>(SubExprs[VAL2]); 4543 } 4544 void setVal2(Expr *E) { 4545 assert(NumSubExprs == 5); 4546 SubExprs[VAL2] = E; 4547 } 4548 4549 AtomicOp getOp() const { return Op; } 4550 void setOp(AtomicOp op) { Op = op; } 4551 unsigned getNumSubExprs() { return NumSubExprs; } 4552 void setNumSubExprs(unsigned num) { NumSubExprs = num; } 4553 4554 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4555 4556 bool isVolatile() const { 4557 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4558 } 4559 4560 bool isCmpXChg() const { 4561 return getOp() == AtomicExpr::CmpXchgStrong || 4562 getOp() == AtomicExpr::CmpXchgWeak; 4563 } 4564 4565 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4566 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 4567 4568 SourceLocation getRParenLoc() const { return RParenLoc; } 4569 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 4570 4571 SourceRange getSourceRange() const { 4572 return SourceRange(BuiltinLoc, RParenLoc); 4573 } 4574 static bool classof(const Stmt *T) { 4575 return T->getStmtClass() == AtomicExprClass; 4576 } 4577 static bool classof(const AtomicExpr *) { return true; } 4578 4579 // Iterators 4580 child_range children() { 4581 return child_range(SubExprs, SubExprs+NumSubExprs); 4582 } 4583}; 4584} // end namespace clang 4585 4586#endif 4587