Expr.h revision e91e0ae772004912285ccc3848b27208da8c045b
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/AST/UsuallyTinyPtrVector.h" 25#include "clang/Basic/TargetInfo.h" 26#include "clang/Basic/TypeTraits.h" 27#include "llvm/ADT/APSInt.h" 28#include "llvm/ADT/APFloat.h" 29#include "llvm/ADT/SmallVector.h" 30#include "llvm/ADT/StringRef.h" 31#include <cctype> 32 33namespace clang { 34 class ASTContext; 35 class APValue; 36 class Decl; 37 class IdentifierInfo; 38 class ParmVarDecl; 39 class NamedDecl; 40 class ValueDecl; 41 class BlockDecl; 42 class CXXBaseSpecifier; 43 class CXXOperatorCallExpr; 44 class CXXMemberCallExpr; 45 class ObjCPropertyRefExpr; 46 class OpaqueValueExpr; 47 48/// \brief A simple array of base specifiers. 49typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 50 51/// Expr - This represents one expression. Note that Expr's are subclasses of 52/// Stmt. This allows an expression to be transparently used any place a Stmt 53/// is required. 54/// 55class Expr : public Stmt { 56 QualType TR; 57 58protected: 59 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 60 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 61 : Stmt(SC) 62 { 63 ExprBits.TypeDependent = TD; 64 ExprBits.ValueDependent = VD; 65 ExprBits.InstantiationDependent = ID; 66 ExprBits.ValueKind = VK; 67 ExprBits.ObjectKind = OK; 68 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 69 setType(T); 70 } 71 72 /// \brief Construct an empty expression. 73 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 74 75public: 76 QualType getType() const { return TR; } 77 void setType(QualType t) { 78 // In C++, the type of an expression is always adjusted so that it 79 // will not have reference type an expression will never have 80 // reference type (C++ [expr]p6). Use 81 // QualType::getNonReferenceType() to retrieve the non-reference 82 // type. Additionally, inspect Expr::isLvalue to determine whether 83 // an expression that is adjusted in this manner should be 84 // considered an lvalue. 85 assert((t.isNull() || !t->isReferenceType()) && 86 "Expressions can't have reference type"); 87 88 TR = t; 89 } 90 91 /// isValueDependent - Determines whether this expression is 92 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 93 /// array bound of "Chars" in the following example is 94 /// value-dependent. 95 /// @code 96 /// template<int Size, char (&Chars)[Size]> struct meta_string; 97 /// @endcode 98 bool isValueDependent() const { return ExprBits.ValueDependent; } 99 100 /// \brief Set whether this expression is value-dependent or not. 101 void setValueDependent(bool VD) { 102 ExprBits.ValueDependent = VD; 103 if (VD) 104 ExprBits.InstantiationDependent = true; 105 } 106 107 /// isTypeDependent - Determines whether this expression is 108 /// type-dependent (C++ [temp.dep.expr]), which means that its type 109 /// could change from one template instantiation to the next. For 110 /// example, the expressions "x" and "x + y" are type-dependent in 111 /// the following code, but "y" is not type-dependent: 112 /// @code 113 /// template<typename T> 114 /// void add(T x, int y) { 115 /// x + y; 116 /// } 117 /// @endcode 118 bool isTypeDependent() const { return ExprBits.TypeDependent; } 119 120 /// \brief Set whether this expression is type-dependent or not. 121 void setTypeDependent(bool TD) { 122 ExprBits.TypeDependent = TD; 123 if (TD) 124 ExprBits.InstantiationDependent = true; 125 } 126 127 /// \brief Whether this expression is instantiation-dependent, meaning that 128 /// it depends in some way on a template parameter, even if neither its type 129 /// nor (constant) value can change due to the template instantiation. 130 /// 131 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 132 /// instantiation-dependent (since it involves a template parameter \c T), but 133 /// is neither type- nor value-dependent, since the type of the inner 134 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 135 /// \c sizeof is known. 136 /// 137 /// \code 138 /// template<typename T> 139 /// void f(T x, T y) { 140 /// sizeof(sizeof(T() + T()); 141 /// } 142 /// \endcode 143 /// 144 bool isInstantiationDependent() const { 145 return ExprBits.InstantiationDependent; 146 } 147 148 /// \brief Set whether this expression is instantiation-dependent or not. 149 void setInstantiationDependent(bool ID) { 150 ExprBits.InstantiationDependent = ID; 151 } 152 153 /// \brief Whether this expression contains an unexpanded parameter 154 /// pack (for C++0x variadic templates). 155 /// 156 /// Given the following function template: 157 /// 158 /// \code 159 /// template<typename F, typename ...Types> 160 /// void forward(const F &f, Types &&...args) { 161 /// f(static_cast<Types&&>(args)...); 162 /// } 163 /// \endcode 164 /// 165 /// The expressions \c args and \c static_cast<Types&&>(args) both 166 /// contain parameter packs. 167 bool containsUnexpandedParameterPack() const { 168 return ExprBits.ContainsUnexpandedParameterPack; 169 } 170 171 /// \brief Set the bit that describes whether this expression 172 /// contains an unexpanded parameter pack. 173 void setContainsUnexpandedParameterPack(bool PP = true) { 174 ExprBits.ContainsUnexpandedParameterPack = PP; 175 } 176 177 /// getExprLoc - Return the preferred location for the arrow when diagnosing 178 /// a problem with a generic expression. 179 SourceLocation getExprLoc() const; 180 181 /// isUnusedResultAWarning - Return true if this immediate expression should 182 /// be warned about if the result is unused. If so, fill in Loc and Ranges 183 /// with location to warn on and the source range[s] to report with the 184 /// warning. 185 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 186 SourceRange &R2, ASTContext &Ctx) const; 187 188 /// isLValue - True if this expression is an "l-value" according to 189 /// the rules of the current language. C and C++ give somewhat 190 /// different rules for this concept, but in general, the result of 191 /// an l-value expression identifies a specific object whereas the 192 /// result of an r-value expression is a value detached from any 193 /// specific storage. 194 /// 195 /// C++0x divides the concept of "r-value" into pure r-values 196 /// ("pr-values") and so-called expiring values ("x-values"), which 197 /// identify specific objects that can be safely cannibalized for 198 /// their resources. This is an unfortunate abuse of terminology on 199 /// the part of the C++ committee. In Clang, when we say "r-value", 200 /// we generally mean a pr-value. 201 bool isLValue() const { return getValueKind() == VK_LValue; } 202 bool isRValue() const { return getValueKind() == VK_RValue; } 203 bool isXValue() const { return getValueKind() == VK_XValue; } 204 bool isGLValue() const { return getValueKind() != VK_RValue; } 205 206 enum LValueClassification { 207 LV_Valid, 208 LV_NotObjectType, 209 LV_IncompleteVoidType, 210 LV_DuplicateVectorComponents, 211 LV_InvalidExpression, 212 LV_InvalidMessageExpression, 213 LV_MemberFunction, 214 LV_SubObjCPropertySetting, 215 LV_ClassTemporary 216 }; 217 /// Reasons why an expression might not be an l-value. 218 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 219 220 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 221 /// does not have an incomplete type, does not have a const-qualified type, 222 /// and if it is a structure or union, does not have any member (including, 223 /// recursively, any member or element of all contained aggregates or unions) 224 /// with a const-qualified type. 225 /// 226 /// \param Loc [in] [out] - A source location which *may* be filled 227 /// in with the location of the expression making this a 228 /// non-modifiable lvalue, if specified. 229 enum isModifiableLvalueResult { 230 MLV_Valid, 231 MLV_NotObjectType, 232 MLV_IncompleteVoidType, 233 MLV_DuplicateVectorComponents, 234 MLV_InvalidExpression, 235 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 236 MLV_IncompleteType, 237 MLV_ConstQualified, 238 MLV_ArrayType, 239 MLV_NotBlockQualified, 240 MLV_ReadonlyProperty, 241 MLV_NoSetterProperty, 242 MLV_MemberFunction, 243 MLV_SubObjCPropertySetting, 244 MLV_InvalidMessageExpression, 245 MLV_ClassTemporary 246 }; 247 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 248 SourceLocation *Loc = 0) const; 249 250 /// \brief The return type of classify(). Represents the C++0x expression 251 /// taxonomy. 252 class Classification { 253 public: 254 /// \brief The various classification results. Most of these mean prvalue. 255 enum Kinds { 256 CL_LValue, 257 CL_XValue, 258 CL_Function, // Functions cannot be lvalues in C. 259 CL_Void, // Void cannot be an lvalue in C. 260 CL_AddressableVoid, // Void expression whose address can be taken in C. 261 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 262 CL_MemberFunction, // An expression referring to a member function 263 CL_SubObjCPropertySetting, 264 CL_ClassTemporary, // A prvalue of class type 265 CL_ObjCMessageRValue, // ObjC message is an rvalue 266 CL_PRValue // A prvalue for any other reason, of any other type 267 }; 268 /// \brief The results of modification testing. 269 enum ModifiableType { 270 CM_Untested, // testModifiable was false. 271 CM_Modifiable, 272 CM_RValue, // Not modifiable because it's an rvalue 273 CM_Function, // Not modifiable because it's a function; C++ only 274 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 275 CM_NotBlockQualified, // Not captured in the closure 276 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 277 CM_ConstQualified, 278 CM_ArrayType, 279 CM_IncompleteType 280 }; 281 282 private: 283 friend class Expr; 284 285 unsigned short Kind; 286 unsigned short Modifiable; 287 288 explicit Classification(Kinds k, ModifiableType m) 289 : Kind(k), Modifiable(m) 290 {} 291 292 public: 293 Classification() {} 294 295 Kinds getKind() const { return static_cast<Kinds>(Kind); } 296 ModifiableType getModifiable() const { 297 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 298 return static_cast<ModifiableType>(Modifiable); 299 } 300 bool isLValue() const { return Kind == CL_LValue; } 301 bool isXValue() const { return Kind == CL_XValue; } 302 bool isGLValue() const { return Kind <= CL_XValue; } 303 bool isPRValue() const { return Kind >= CL_Function; } 304 bool isRValue() const { return Kind >= CL_XValue; } 305 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 306 307 /// \brief Create a simple, modifiably lvalue 308 static Classification makeSimpleLValue() { 309 return Classification(CL_LValue, CM_Modifiable); 310 } 311 312 }; 313 /// \brief Classify - Classify this expression according to the C++0x 314 /// expression taxonomy. 315 /// 316 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 317 /// old lvalue vs rvalue. This function determines the type of expression this 318 /// is. There are three expression types: 319 /// - lvalues are classical lvalues as in C++03. 320 /// - prvalues are equivalent to rvalues in C++03. 321 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 322 /// function returning an rvalue reference. 323 /// lvalues and xvalues are collectively referred to as glvalues, while 324 /// prvalues and xvalues together form rvalues. 325 Classification Classify(ASTContext &Ctx) const { 326 return ClassifyImpl(Ctx, 0); 327 } 328 329 /// \brief ClassifyModifiable - Classify this expression according to the 330 /// C++0x expression taxonomy, and see if it is valid on the left side 331 /// of an assignment. 332 /// 333 /// This function extends classify in that it also tests whether the 334 /// expression is modifiable (C99 6.3.2.1p1). 335 /// \param Loc A source location that might be filled with a relevant location 336 /// if the expression is not modifiable. 337 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 338 return ClassifyImpl(Ctx, &Loc); 339 } 340 341 /// getValueKindForType - Given a formal return or parameter type, 342 /// give its value kind. 343 static ExprValueKind getValueKindForType(QualType T) { 344 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 345 return (isa<LValueReferenceType>(RT) 346 ? VK_LValue 347 : (RT->getPointeeType()->isFunctionType() 348 ? VK_LValue : VK_XValue)); 349 return VK_RValue; 350 } 351 352 /// getValueKind - The value kind that this expression produces. 353 ExprValueKind getValueKind() const { 354 return static_cast<ExprValueKind>(ExprBits.ValueKind); 355 } 356 357 /// getObjectKind - The object kind that this expression produces. 358 /// Object kinds are meaningful only for expressions that yield an 359 /// l-value or x-value. 360 ExprObjectKind getObjectKind() const { 361 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 362 } 363 364 bool isOrdinaryOrBitFieldObject() const { 365 ExprObjectKind OK = getObjectKind(); 366 return (OK == OK_Ordinary || OK == OK_BitField); 367 } 368 369 /// setValueKind - Set the value kind produced by this expression. 370 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 371 372 /// setObjectKind - Set the object kind produced by this expression. 373 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 374 375private: 376 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 377 378public: 379 380 /// \brief If this expression refers to a bit-field, retrieve the 381 /// declaration of that bit-field. 382 FieldDecl *getBitField(); 383 384 const FieldDecl *getBitField() const { 385 return const_cast<Expr*>(this)->getBitField(); 386 } 387 388 /// \brief If this expression is an l-value for an Objective C 389 /// property, find the underlying property reference expression. 390 const ObjCPropertyRefExpr *getObjCProperty() const; 391 392 /// \brief Returns whether this expression refers to a vector element. 393 bool refersToVectorElement() const; 394 395 /// \brief Returns whether this expression has a placeholder type. 396 bool hasPlaceholderType() const { 397 return getType()->isPlaceholderType(); 398 } 399 400 /// \brief Returns whether this expression has a specific placeholder type. 401 bool hasPlaceholderType(BuiltinType::Kind K) const { 402 assert(BuiltinType::isPlaceholderTypeKind(K)); 403 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 404 return BT->getKind() == K; 405 return false; 406 } 407 408 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 409 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 410 /// but also int expressions which are produced by things like comparisons in 411 /// C. 412 bool isKnownToHaveBooleanValue() const; 413 414 /// isIntegerConstantExpr - Return true if this expression is a valid integer 415 /// constant expression, and, if so, return its value in Result. If not a 416 /// valid i-c-e, return false and fill in Loc (if specified) with the location 417 /// of the invalid expression. 418 /// 419 /// Note: This does not perform the implicit conversions required by C++11 420 /// [expr.const]p5. 421 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 422 SourceLocation *Loc = 0, 423 bool isEvaluated = true) const; 424 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const; 425 426 /// isCXX11ConstantExpr - Return true if this expression is a constant 427 /// expression in C++11. Can only be used in C++. 428 /// 429 /// Note: This does not perform the implicit conversions required by C++11 430 /// [expr.const]p5. 431 bool isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result = 0, 432 SourceLocation *Loc = 0) const; 433 434 /// isPotentialConstantExpr - Return true if this function's definition 435 /// might be usable in a constant expression in C++11, if it were marked 436 /// constexpr. Return false if the function can never produce a constant 437 /// expression, along with diagnostics describing why not. 438 static bool isPotentialConstantExpr(const FunctionDecl *FD, 439 llvm::SmallVectorImpl< 440 PartialDiagnosticAt> &Diags); 441 442 /// isConstantInitializer - Returns true if this expression can be emitted to 443 /// IR as a constant, and thus can be used as a constant initializer in C. 444 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 445 446 /// EvalStatus is a struct with detailed info about an evaluation in progress. 447 struct EvalStatus { 448 /// HasSideEffects - Whether the evaluated expression has side effects. 449 /// For example, (f() && 0) can be folded, but it still has side effects. 450 bool HasSideEffects; 451 452 /// Diag - If this is non-null, it will be filled in with a stack of notes 453 /// indicating why evaluation failed (or why it failed to produce a constant 454 /// expression). 455 /// If the expression is unfoldable, the notes will indicate why it's not 456 /// foldable. If the expression is foldable, but not a constant expression, 457 /// the notes will describes why it isn't a constant expression. If the 458 /// expression *is* a constant expression, no notes will be produced. 459 llvm::SmallVectorImpl<PartialDiagnosticAt> *Diag; 460 461 EvalStatus() : HasSideEffects(false), Diag(0) {} 462 463 // hasSideEffects - Return true if the evaluated expression has 464 // side effects. 465 bool hasSideEffects() const { 466 return HasSideEffects; 467 } 468 }; 469 470 /// EvalResult is a struct with detailed info about an evaluated expression. 471 struct EvalResult : EvalStatus { 472 /// Val - This is the value the expression can be folded to. 473 APValue Val; 474 475 // isGlobalLValue - Return true if the evaluated lvalue expression 476 // is global. 477 bool isGlobalLValue() const; 478 }; 479 480 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 481 /// an rvalue using any crazy technique (that has nothing to do with language 482 /// standards) that we want to, even if the expression has side-effects. If 483 /// this function returns true, it returns the folded constant in Result. If 484 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 485 /// applied. 486 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 487 488 /// EvaluateAsBooleanCondition - Return true if this is a constant 489 /// which we we can fold and convert to a boolean condition using 490 /// any crazy technique that we want to, even if the expression has 491 /// side-effects. 492 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 493 494 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects }; 495 496 /// EvaluateAsInt - Return true if this is a constant which we can fold and 497 /// convert to an integer, using any crazy technique that we want to. 498 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 499 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 500 501 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 502 /// constant folded without side-effects, but discard the result. 503 bool isEvaluatable(const ASTContext &Ctx) const; 504 505 /// HasSideEffects - This routine returns true for all those expressions 506 /// which must be evaluated each time and must not be optimized away 507 /// or evaluated at compile time. Example is a function call, volatile 508 /// variable read. 509 bool HasSideEffects(const ASTContext &Ctx) const; 510 511 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 512 /// integer. This must be called on an expression that constant folds to an 513 /// integer. 514 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 515 516 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 517 /// lvalue with link time known address, with no side-effects. 518 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 519 520 /// EvaluateAsInitializer - Evaluate an expression as if it were the 521 /// initializer of the given declaration. Returns true if the initializer 522 /// can be folded to a constant, and produces any relevant notes. In C++11, 523 /// notes will be produced if the expression is not a constant expression. 524 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 525 const VarDecl *VD, 526 llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 527 528 /// \brief Enumeration used to describe the kind of Null pointer constant 529 /// returned from \c isNullPointerConstant(). 530 enum NullPointerConstantKind { 531 /// \brief Expression is not a Null pointer constant. 532 NPCK_NotNull = 0, 533 534 /// \brief Expression is a Null pointer constant built from a zero integer. 535 NPCK_ZeroInteger, 536 537 /// \brief Expression is a C++0X nullptr. 538 NPCK_CXX0X_nullptr, 539 540 /// \brief Expression is a GNU-style __null constant. 541 NPCK_GNUNull 542 }; 543 544 /// \brief Enumeration used to describe how \c isNullPointerConstant() 545 /// should cope with value-dependent expressions. 546 enum NullPointerConstantValueDependence { 547 /// \brief Specifies that the expression should never be value-dependent. 548 NPC_NeverValueDependent = 0, 549 550 /// \brief Specifies that a value-dependent expression of integral or 551 /// dependent type should be considered a null pointer constant. 552 NPC_ValueDependentIsNull, 553 554 /// \brief Specifies that a value-dependent expression should be considered 555 /// to never be a null pointer constant. 556 NPC_ValueDependentIsNotNull 557 }; 558 559 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 560 /// a Null pointer constant. The return value can further distinguish the 561 /// kind of NULL pointer constant that was detected. 562 NullPointerConstantKind isNullPointerConstant( 563 ASTContext &Ctx, 564 NullPointerConstantValueDependence NPC) const; 565 566 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 567 /// write barrier. 568 bool isOBJCGCCandidate(ASTContext &Ctx) const; 569 570 /// \brief Returns true if this expression is a bound member function. 571 bool isBoundMemberFunction(ASTContext &Ctx) const; 572 573 /// \brief Given an expression of bound-member type, find the type 574 /// of the member. Returns null if this is an *overloaded* bound 575 /// member expression. 576 static QualType findBoundMemberType(const Expr *expr); 577 578 /// \brief Result type of CanThrow(). 579 enum CanThrowResult { 580 CT_Cannot, 581 CT_Dependent, 582 CT_Can 583 }; 584 /// \brief Test if this expression, if evaluated, might throw, according to 585 /// the rules of C++ [expr.unary.noexcept]. 586 CanThrowResult CanThrow(ASTContext &C) const; 587 588 /// IgnoreImpCasts - Skip past any implicit casts which might 589 /// surround this expression. Only skips ImplicitCastExprs. 590 Expr *IgnoreImpCasts(); 591 592 /// IgnoreImplicit - Skip past any implicit AST nodes which might 593 /// surround this expression. 594 Expr *IgnoreImplicit() { return cast<Expr>(Stmt::IgnoreImplicit()); } 595 596 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 597 /// its subexpression. If that subexpression is also a ParenExpr, 598 /// then this method recursively returns its subexpression, and so forth. 599 /// Otherwise, the method returns the current Expr. 600 Expr *IgnoreParens(); 601 602 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 603 /// or CastExprs, returning their operand. 604 Expr *IgnoreParenCasts(); 605 606 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 607 /// any ParenExpr or ImplicitCastExprs, returning their operand. 608 Expr *IgnoreParenImpCasts(); 609 610 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 611 /// call to a conversion operator, return the argument. 612 Expr *IgnoreConversionOperator(); 613 614 const Expr *IgnoreConversionOperator() const { 615 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 616 } 617 618 const Expr *IgnoreParenImpCasts() const { 619 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 620 } 621 622 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 623 /// CastExprs that represent lvalue casts, returning their operand. 624 Expr *IgnoreParenLValueCasts(); 625 626 const Expr *IgnoreParenLValueCasts() const { 627 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 628 } 629 630 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 631 /// value (including ptr->int casts of the same size). Strip off any 632 /// ParenExpr or CastExprs, returning their operand. 633 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 634 635 /// \brief Determine whether this expression is a default function argument. 636 /// 637 /// Default arguments are implicitly generated in the abstract syntax tree 638 /// by semantic analysis for function calls, object constructions, etc. in 639 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 640 /// this routine also looks through any implicit casts to determine whether 641 /// the expression is a default argument. 642 bool isDefaultArgument() const; 643 644 /// \brief Determine whether the result of this expression is a 645 /// temporary object of the given class type. 646 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 647 648 /// \brief Whether this expression is an implicit reference to 'this' in C++. 649 bool isImplicitCXXThis() const; 650 651 const Expr *IgnoreImpCasts() const { 652 return const_cast<Expr*>(this)->IgnoreImpCasts(); 653 } 654 const Expr *IgnoreParens() const { 655 return const_cast<Expr*>(this)->IgnoreParens(); 656 } 657 const Expr *IgnoreParenCasts() const { 658 return const_cast<Expr*>(this)->IgnoreParenCasts(); 659 } 660 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 661 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 662 } 663 664 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 665 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 666 667 static bool classof(const Stmt *T) { 668 return T->getStmtClass() >= firstExprConstant && 669 T->getStmtClass() <= lastExprConstant; 670 } 671 static bool classof(const Expr *) { return true; } 672}; 673 674 675//===----------------------------------------------------------------------===// 676// Primary Expressions. 677//===----------------------------------------------------------------------===// 678 679/// OpaqueValueExpr - An expression referring to an opaque object of a 680/// fixed type and value class. These don't correspond to concrete 681/// syntax; instead they're used to express operations (usually copy 682/// operations) on values whose source is generally obvious from 683/// context. 684class OpaqueValueExpr : public Expr { 685 friend class ASTStmtReader; 686 Expr *SourceExpr; 687 SourceLocation Loc; 688 689public: 690 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 691 ExprObjectKind OK = OK_Ordinary) 692 : Expr(OpaqueValueExprClass, T, VK, OK, 693 T->isDependentType(), T->isDependentType(), 694 T->isInstantiationDependentType(), 695 false), 696 SourceExpr(0), Loc(Loc) { 697 } 698 699 /// Given an expression which invokes a copy constructor --- i.e. a 700 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 701 /// find the OpaqueValueExpr that's the source of the construction. 702 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 703 704 explicit OpaqueValueExpr(EmptyShell Empty) 705 : Expr(OpaqueValueExprClass, Empty) { } 706 707 /// \brief Retrieve the location of this expression. 708 SourceLocation getLocation() const { return Loc; } 709 710 SourceRange getSourceRange() const { 711 if (SourceExpr) return SourceExpr->getSourceRange(); 712 return Loc; 713 } 714 SourceLocation getExprLoc() const { 715 if (SourceExpr) return SourceExpr->getExprLoc(); 716 return Loc; 717 } 718 719 child_range children() { return child_range(); } 720 721 /// The source expression of an opaque value expression is the 722 /// expression which originally generated the value. This is 723 /// provided as a convenience for analyses that don't wish to 724 /// precisely model the execution behavior of the program. 725 /// 726 /// The source expression is typically set when building the 727 /// expression which binds the opaque value expression in the first 728 /// place. 729 Expr *getSourceExpr() const { return SourceExpr; } 730 void setSourceExpr(Expr *e) { SourceExpr = e; } 731 732 static bool classof(const Stmt *T) { 733 return T->getStmtClass() == OpaqueValueExprClass; 734 } 735 static bool classof(const OpaqueValueExpr *) { return true; } 736}; 737 738/// \brief A reference to a declared variable, function, enum, etc. 739/// [C99 6.5.1p2] 740/// 741/// This encodes all the information about how a declaration is referenced 742/// within an expression. 743/// 744/// There are several optional constructs attached to DeclRefExprs only when 745/// they apply in order to conserve memory. These are laid out past the end of 746/// the object, and flags in the DeclRefExprBitfield track whether they exist: 747/// 748/// DeclRefExprBits.HasQualifier: 749/// Specifies when this declaration reference expression has a C++ 750/// nested-name-specifier. 751/// DeclRefExprBits.HasFoundDecl: 752/// Specifies when this declaration reference expression has a record of 753/// a NamedDecl (different from the referenced ValueDecl) which was found 754/// during name lookup and/or overload resolution. 755/// DeclRefExprBits.HasTemplateKWAndArgsInfo: 756/// Specifies when this declaration reference expression has an explicit 757/// C++ template keyword and/or template argument list. 758class DeclRefExpr : public Expr { 759 /// \brief The declaration that we are referencing. 760 ValueDecl *D; 761 762 /// \brief The location of the declaration name itself. 763 SourceLocation Loc; 764 765 /// \brief Provides source/type location info for the declaration name 766 /// embedded in D. 767 DeclarationNameLoc DNLoc; 768 769 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 770 NestedNameSpecifierLoc &getInternalQualifierLoc() { 771 assert(hasQualifier()); 772 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 773 } 774 775 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 776 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 777 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 778 } 779 780 /// \brief Test whether there is a distinct FoundDecl attached to the end of 781 /// this DRE. 782 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 783 784 /// \brief Helper to retrieve the optional NamedDecl through which this 785 /// reference occured. 786 NamedDecl *&getInternalFoundDecl() { 787 assert(hasFoundDecl()); 788 if (hasQualifier()) 789 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 790 return *reinterpret_cast<NamedDecl **>(this + 1); 791 } 792 793 /// \brief Helper to retrieve the optional NamedDecl through which this 794 /// reference occured. 795 NamedDecl *getInternalFoundDecl() const { 796 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 797 } 798 799 DeclRefExpr(NestedNameSpecifierLoc QualifierLoc, 800 SourceLocation TemplateKWLoc, 801 ValueDecl *D, const DeclarationNameInfo &NameInfo, 802 NamedDecl *FoundD, 803 const TemplateArgumentListInfo *TemplateArgs, 804 QualType T, ExprValueKind VK); 805 806 /// \brief Construct an empty declaration reference expression. 807 explicit DeclRefExpr(EmptyShell Empty) 808 : Expr(DeclRefExprClass, Empty) { } 809 810 /// \brief Computes the type- and value-dependence flags for this 811 /// declaration reference expression. 812 void computeDependence(); 813 814public: 815 DeclRefExpr(ValueDecl *D, QualType T, ExprValueKind VK, SourceLocation L, 816 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 817 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 818 D(D), Loc(L), DNLoc(LocInfo) { 819 DeclRefExprBits.HasQualifier = 0; 820 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 821 DeclRefExprBits.HasFoundDecl = 0; 822 DeclRefExprBits.HadMultipleCandidates = 0; 823 computeDependence(); 824 } 825 826 static DeclRefExpr *Create(ASTContext &Context, 827 NestedNameSpecifierLoc QualifierLoc, 828 SourceLocation TemplateKWLoc, 829 ValueDecl *D, 830 SourceLocation NameLoc, 831 QualType T, ExprValueKind VK, 832 NamedDecl *FoundD = 0, 833 const TemplateArgumentListInfo *TemplateArgs = 0); 834 835 static DeclRefExpr *Create(ASTContext &Context, 836 NestedNameSpecifierLoc QualifierLoc, 837 SourceLocation TemplateKWLoc, 838 ValueDecl *D, 839 const DeclarationNameInfo &NameInfo, 840 QualType T, ExprValueKind VK, 841 NamedDecl *FoundD = 0, 842 const TemplateArgumentListInfo *TemplateArgs = 0); 843 844 /// \brief Construct an empty declaration reference expression. 845 static DeclRefExpr *CreateEmpty(ASTContext &Context, 846 bool HasQualifier, 847 bool HasFoundDecl, 848 bool HasTemplateKWAndArgsInfo, 849 unsigned NumTemplateArgs); 850 851 ValueDecl *getDecl() { return D; } 852 const ValueDecl *getDecl() const { return D; } 853 void setDecl(ValueDecl *NewD) { D = NewD; } 854 855 DeclarationNameInfo getNameInfo() const { 856 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 857 } 858 859 SourceLocation getLocation() const { return Loc; } 860 void setLocation(SourceLocation L) { Loc = L; } 861 SourceRange getSourceRange() const; 862 863 /// \brief Determine whether this declaration reference was preceded by a 864 /// C++ nested-name-specifier, e.g., \c N::foo. 865 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 866 867 /// \brief If the name was qualified, retrieves the nested-name-specifier 868 /// that precedes the name. Otherwise, returns NULL. 869 NestedNameSpecifier *getQualifier() const { 870 if (!hasQualifier()) 871 return 0; 872 873 return getInternalQualifierLoc().getNestedNameSpecifier(); 874 } 875 876 /// \brief If the name was qualified, retrieves the nested-name-specifier 877 /// that precedes the name, with source-location information. 878 NestedNameSpecifierLoc getQualifierLoc() const { 879 if (!hasQualifier()) 880 return NestedNameSpecifierLoc(); 881 882 return getInternalQualifierLoc(); 883 } 884 885 /// \brief Get the NamedDecl through which this reference occured. 886 /// 887 /// This Decl may be different from the ValueDecl actually referred to in the 888 /// presence of using declarations, etc. It always returns non-NULL, and may 889 /// simple return the ValueDecl when appropriate. 890 NamedDecl *getFoundDecl() { 891 return hasFoundDecl() ? getInternalFoundDecl() : D; 892 } 893 894 /// \brief Get the NamedDecl through which this reference occurred. 895 /// See non-const variant. 896 const NamedDecl *getFoundDecl() const { 897 return hasFoundDecl() ? getInternalFoundDecl() : D; 898 } 899 900 bool hasTemplateKWAndArgsInfo() const { 901 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 902 } 903 904 /// \brief Return the optional template keyword and arguments info. 905 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 906 if (!hasTemplateKWAndArgsInfo()) 907 return 0; 908 909 if (hasFoundDecl()) 910 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 911 &getInternalFoundDecl() + 1); 912 913 if (hasQualifier()) 914 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 915 &getInternalQualifierLoc() + 1); 916 917 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 918 } 919 920 /// \brief Return the optional template keyword and arguments info. 921 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 922 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo(); 923 } 924 925 /// \brief Retrieve the location of the template keyword preceding 926 /// this name, if any. 927 SourceLocation getTemplateKeywordLoc() const { 928 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 929 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 930 } 931 932 /// \brief Retrieve the location of the left angle bracket starting the 933 /// explicit template argument list following the name, if any. 934 SourceLocation getLAngleLoc() const { 935 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 936 return getTemplateKWAndArgsInfo()->LAngleLoc; 937 } 938 939 /// \brief Retrieve the location of the right angle bracket ending the 940 /// explicit template argument list following the name, if any. 941 SourceLocation getRAngleLoc() const { 942 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 943 return getTemplateKWAndArgsInfo()->RAngleLoc; 944 } 945 946 /// \brief Determines whether the name in this declaration reference 947 /// was preceded by the template keyword. 948 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 949 950 /// \brief Determines whether this declaration reference was followed by an 951 /// explicit template argument list. 952 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 953 954 /// \brief Retrieve the explicit template argument list that followed the 955 /// member template name. 956 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 957 assert(hasExplicitTemplateArgs()); 958 return *getTemplateKWAndArgsInfo(); 959 } 960 961 /// \brief Retrieve the explicit template argument list that followed the 962 /// member template name. 963 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 964 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 965 } 966 967 /// \brief Retrieves the optional explicit template arguments. 968 /// This points to the same data as getExplicitTemplateArgs(), but 969 /// returns null if there are no explicit template arguments. 970 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 971 if (!hasExplicitTemplateArgs()) return 0; 972 return &getExplicitTemplateArgs(); 973 } 974 975 /// \brief Copies the template arguments (if present) into the given 976 /// structure. 977 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 978 if (hasExplicitTemplateArgs()) 979 getExplicitTemplateArgs().copyInto(List); 980 } 981 982 /// \brief Retrieve the template arguments provided as part of this 983 /// template-id. 984 const TemplateArgumentLoc *getTemplateArgs() const { 985 if (!hasExplicitTemplateArgs()) 986 return 0; 987 988 return getExplicitTemplateArgs().getTemplateArgs(); 989 } 990 991 /// \brief Retrieve the number of template arguments provided as part of this 992 /// template-id. 993 unsigned getNumTemplateArgs() const { 994 if (!hasExplicitTemplateArgs()) 995 return 0; 996 997 return getExplicitTemplateArgs().NumTemplateArgs; 998 } 999 1000 /// \brief Returns true if this expression refers to a function that 1001 /// was resolved from an overloaded set having size greater than 1. 1002 bool hadMultipleCandidates() const { 1003 return DeclRefExprBits.HadMultipleCandidates; 1004 } 1005 /// \brief Sets the flag telling whether this expression refers to 1006 /// a function that was resolved from an overloaded set having size 1007 /// greater than 1. 1008 void setHadMultipleCandidates(bool V = true) { 1009 DeclRefExprBits.HadMultipleCandidates = V; 1010 } 1011 1012 static bool classof(const Stmt *T) { 1013 return T->getStmtClass() == DeclRefExprClass; 1014 } 1015 static bool classof(const DeclRefExpr *) { return true; } 1016 1017 // Iterators 1018 child_range children() { return child_range(); } 1019 1020 friend class ASTStmtReader; 1021 friend class ASTStmtWriter; 1022}; 1023 1024/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 1025class PredefinedExpr : public Expr { 1026public: 1027 enum IdentType { 1028 Func, 1029 Function, 1030 PrettyFunction, 1031 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 1032 /// 'virtual' keyword is omitted for virtual member functions. 1033 PrettyFunctionNoVirtual 1034 }; 1035 1036private: 1037 SourceLocation Loc; 1038 IdentType Type; 1039public: 1040 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 1041 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 1042 type->isDependentType(), type->isDependentType(), 1043 type->isInstantiationDependentType(), 1044 /*ContainsUnexpandedParameterPack=*/false), 1045 Loc(l), Type(IT) {} 1046 1047 /// \brief Construct an empty predefined expression. 1048 explicit PredefinedExpr(EmptyShell Empty) 1049 : Expr(PredefinedExprClass, Empty) { } 1050 1051 IdentType getIdentType() const { return Type; } 1052 void setIdentType(IdentType IT) { Type = IT; } 1053 1054 SourceLocation getLocation() const { return Loc; } 1055 void setLocation(SourceLocation L) { Loc = L; } 1056 1057 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1058 1059 SourceRange getSourceRange() const { return SourceRange(Loc); } 1060 1061 static bool classof(const Stmt *T) { 1062 return T->getStmtClass() == PredefinedExprClass; 1063 } 1064 static bool classof(const PredefinedExpr *) { return true; } 1065 1066 // Iterators 1067 child_range children() { return child_range(); } 1068}; 1069 1070/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1071/// leaking memory. 1072/// 1073/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1074/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1075/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1076/// the APFloat/APInt values will never get freed. APNumericStorage uses 1077/// ASTContext's allocator for memory allocation. 1078class APNumericStorage { 1079 unsigned BitWidth; 1080 union { 1081 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1082 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1083 }; 1084 1085 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1086 1087 APNumericStorage(const APNumericStorage&); // do not implement 1088 APNumericStorage& operator=(const APNumericStorage&); // do not implement 1089 1090protected: 1091 APNumericStorage() : BitWidth(0), VAL(0) { } 1092 1093 llvm::APInt getIntValue() const { 1094 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1095 if (NumWords > 1) 1096 return llvm::APInt(BitWidth, NumWords, pVal); 1097 else 1098 return llvm::APInt(BitWidth, VAL); 1099 } 1100 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1101}; 1102 1103class APIntStorage : public APNumericStorage { 1104public: 1105 llvm::APInt getValue() const { return getIntValue(); } 1106 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1107}; 1108 1109class APFloatStorage : public APNumericStorage { 1110public: 1111 llvm::APFloat getValue(bool IsIEEE) const { 1112 return llvm::APFloat(getIntValue(), IsIEEE); 1113 } 1114 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1115 setIntValue(C, Val.bitcastToAPInt()); 1116 } 1117}; 1118 1119class IntegerLiteral : public Expr { 1120 APIntStorage Num; 1121 SourceLocation Loc; 1122 1123 /// \brief Construct an empty integer literal. 1124 explicit IntegerLiteral(EmptyShell Empty) 1125 : Expr(IntegerLiteralClass, Empty) { } 1126 1127public: 1128 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1129 // or UnsignedLongLongTy 1130 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 1131 QualType type, SourceLocation l) 1132 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1133 false, false), 1134 Loc(l) { 1135 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 1136 assert(V.getBitWidth() == C.getIntWidth(type) && 1137 "Integer type is not the correct size for constant."); 1138 setValue(C, V); 1139 } 1140 1141 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1142 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1143 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1144 /// \param V - the value that the returned integer literal contains. 1145 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1146 QualType type, SourceLocation l); 1147 /// \brief Returns a new empty integer literal. 1148 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1149 1150 llvm::APInt getValue() const { return Num.getValue(); } 1151 SourceRange getSourceRange() const { return SourceRange(Loc); } 1152 1153 /// \brief Retrieve the location of the literal. 1154 SourceLocation getLocation() const { return Loc; } 1155 1156 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 1157 void setLocation(SourceLocation Location) { Loc = Location; } 1158 1159 static bool classof(const Stmt *T) { 1160 return T->getStmtClass() == IntegerLiteralClass; 1161 } 1162 static bool classof(const IntegerLiteral *) { return true; } 1163 1164 // Iterators 1165 child_range children() { return child_range(); } 1166}; 1167 1168class CharacterLiteral : public Expr { 1169public: 1170 enum CharacterKind { 1171 Ascii, 1172 Wide, 1173 UTF16, 1174 UTF32 1175 }; 1176 1177private: 1178 unsigned Value; 1179 SourceLocation Loc; 1180 unsigned Kind : 2; 1181public: 1182 // type should be IntTy 1183 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1184 SourceLocation l) 1185 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1186 false, false), 1187 Value(value), Loc(l), Kind(kind) { 1188 } 1189 1190 /// \brief Construct an empty character literal. 1191 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1192 1193 SourceLocation getLocation() const { return Loc; } 1194 CharacterKind getKind() const { return static_cast<CharacterKind>(Kind); } 1195 1196 SourceRange getSourceRange() const { return SourceRange(Loc); } 1197 1198 unsigned getValue() const { return Value; } 1199 1200 void setLocation(SourceLocation Location) { Loc = Location; } 1201 void setKind(CharacterKind kind) { Kind = kind; } 1202 void setValue(unsigned Val) { Value = Val; } 1203 1204 static bool classof(const Stmt *T) { 1205 return T->getStmtClass() == CharacterLiteralClass; 1206 } 1207 static bool classof(const CharacterLiteral *) { return true; } 1208 1209 // Iterators 1210 child_range children() { return child_range(); } 1211}; 1212 1213class FloatingLiteral : public Expr { 1214 APFloatStorage Num; 1215 bool IsIEEE : 1; // Distinguishes between PPC128 and IEEE128. 1216 bool IsExact : 1; 1217 SourceLocation Loc; 1218 1219 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1220 QualType Type, SourceLocation L) 1221 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1222 false, false), 1223 IsIEEE(&C.getTargetInfo().getLongDoubleFormat() == 1224 &llvm::APFloat::IEEEquad), 1225 IsExact(isexact), Loc(L) { 1226 setValue(C, V); 1227 } 1228 1229 /// \brief Construct an empty floating-point literal. 1230 explicit FloatingLiteral(ASTContext &C, EmptyShell Empty) 1231 : Expr(FloatingLiteralClass, Empty), 1232 IsIEEE(&C.getTargetInfo().getLongDoubleFormat() == 1233 &llvm::APFloat::IEEEquad), 1234 IsExact(false) { } 1235 1236public: 1237 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1238 bool isexact, QualType Type, SourceLocation L); 1239 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1240 1241 llvm::APFloat getValue() const { return Num.getValue(IsIEEE); } 1242 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1243 Num.setValue(C, Val); 1244 } 1245 1246 bool isExact() const { return IsExact; } 1247 void setExact(bool E) { IsExact = E; } 1248 1249 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1250 /// double. Note that this may cause loss of precision, but is useful for 1251 /// debugging dumps, etc. 1252 double getValueAsApproximateDouble() const; 1253 1254 SourceLocation getLocation() const { return Loc; } 1255 void setLocation(SourceLocation L) { Loc = L; } 1256 1257 SourceRange getSourceRange() const { return SourceRange(Loc); } 1258 1259 static bool classof(const Stmt *T) { 1260 return T->getStmtClass() == FloatingLiteralClass; 1261 } 1262 static bool classof(const FloatingLiteral *) { return true; } 1263 1264 // Iterators 1265 child_range children() { return child_range(); } 1266}; 1267 1268/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1269/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1270/// IntegerLiteral classes. Instances of this class always have a Complex type 1271/// whose element type matches the subexpression. 1272/// 1273class ImaginaryLiteral : public Expr { 1274 Stmt *Val; 1275public: 1276 ImaginaryLiteral(Expr *val, QualType Ty) 1277 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1278 false, false), 1279 Val(val) {} 1280 1281 /// \brief Build an empty imaginary literal. 1282 explicit ImaginaryLiteral(EmptyShell Empty) 1283 : Expr(ImaginaryLiteralClass, Empty) { } 1284 1285 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1286 Expr *getSubExpr() { return cast<Expr>(Val); } 1287 void setSubExpr(Expr *E) { Val = E; } 1288 1289 SourceRange getSourceRange() const { return Val->getSourceRange(); } 1290 static bool classof(const Stmt *T) { 1291 return T->getStmtClass() == ImaginaryLiteralClass; 1292 } 1293 static bool classof(const ImaginaryLiteral *) { return true; } 1294 1295 // Iterators 1296 child_range children() { return child_range(&Val, &Val+1); } 1297}; 1298 1299/// StringLiteral - This represents a string literal expression, e.g. "foo" 1300/// or L"bar" (wide strings). The actual string is returned by getStrData() 1301/// is NOT null-terminated, and the length of the string is determined by 1302/// calling getByteLength(). The C type for a string is always a 1303/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1304/// not. 1305/// 1306/// Note that strings in C can be formed by concatenation of multiple string 1307/// literal pptokens in translation phase #6. This keeps track of the locations 1308/// of each of these pieces. 1309/// 1310/// Strings in C can also be truncated and extended by assigning into arrays, 1311/// e.g. with constructs like: 1312/// char X[2] = "foobar"; 1313/// In this case, getByteLength() will return 6, but the string literal will 1314/// have type "char[2]". 1315class StringLiteral : public Expr { 1316public: 1317 enum StringKind { 1318 Ascii, 1319 Wide, 1320 UTF8, 1321 UTF16, 1322 UTF32 1323 }; 1324 1325private: 1326 friend class ASTStmtReader; 1327 1328 union { 1329 const char *asChar; 1330 const uint16_t *asUInt16; 1331 const uint32_t *asUInt32; 1332 } StrData; 1333 unsigned Length; 1334 unsigned CharByteWidth; 1335 unsigned NumConcatenated; 1336 unsigned Kind : 3; 1337 bool IsPascal : 1; 1338 SourceLocation TokLocs[1]; 1339 1340 StringLiteral(QualType Ty) : 1341 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1342 false) {} 1343 1344 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1345 1346public: 1347 /// This is the "fully general" constructor that allows representation of 1348 /// strings formed from multiple concatenated tokens. 1349 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1350 bool Pascal, QualType Ty, 1351 const SourceLocation *Loc, unsigned NumStrs); 1352 1353 /// Simple constructor for string literals made from one token. 1354 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1355 bool Pascal, QualType Ty, 1356 SourceLocation Loc) { 1357 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1358 } 1359 1360 /// \brief Construct an empty string literal. 1361 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1362 1363 StringRef getString() const { 1364 assert(CharByteWidth==1 1365 && "This function is used in places that assume strings use char"); 1366 return StringRef(StrData.asChar, getByteLength()); 1367 } 1368 1369 /// Allow clients that need the byte representation, such as ASTWriterStmt 1370 /// ::VisitStringLiteral(), access. 1371 StringRef getBytes() const { 1372 // FIXME: StringRef may not be the right type to use as a result for this. 1373 if (CharByteWidth == 1) 1374 return StringRef(StrData.asChar, getByteLength()); 1375 if (CharByteWidth == 4) 1376 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1377 getByteLength()); 1378 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1379 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1380 getByteLength()); 1381 } 1382 1383 uint32_t getCodeUnit(size_t i) const { 1384 assert(i < Length && "out of bounds access"); 1385 if (CharByteWidth == 1) 1386 return static_cast<unsigned char>(StrData.asChar[i]); 1387 if (CharByteWidth == 4) 1388 return StrData.asUInt32[i]; 1389 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1390 return StrData.asUInt16[i]; 1391 } 1392 1393 unsigned getByteLength() const { return CharByteWidth*Length; } 1394 unsigned getLength() const { return Length; } 1395 unsigned getCharByteWidth() const { return CharByteWidth; } 1396 1397 /// \brief Sets the string data to the given string data. 1398 void setString(ASTContext &C, StringRef Str, 1399 StringKind Kind, bool IsPascal); 1400 1401 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1402 1403 1404 bool isAscii() const { return Kind == Ascii; } 1405 bool isWide() const { return Kind == Wide; } 1406 bool isUTF8() const { return Kind == UTF8; } 1407 bool isUTF16() const { return Kind == UTF16; } 1408 bool isUTF32() const { return Kind == UTF32; } 1409 bool isPascal() const { return IsPascal; } 1410 1411 bool containsNonAsciiOrNull() const { 1412 StringRef Str = getString(); 1413 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1414 if (!isascii(Str[i]) || !Str[i]) 1415 return true; 1416 return false; 1417 } 1418 1419 /// getNumConcatenated - Get the number of string literal tokens that were 1420 /// concatenated in translation phase #6 to form this string literal. 1421 unsigned getNumConcatenated() const { return NumConcatenated; } 1422 1423 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1424 assert(TokNum < NumConcatenated && "Invalid tok number"); 1425 return TokLocs[TokNum]; 1426 } 1427 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1428 assert(TokNum < NumConcatenated && "Invalid tok number"); 1429 TokLocs[TokNum] = L; 1430 } 1431 1432 /// getLocationOfByte - Return a source location that points to the specified 1433 /// byte of this string literal. 1434 /// 1435 /// Strings are amazingly complex. They can be formed from multiple tokens 1436 /// and can have escape sequences in them in addition to the usual trigraph 1437 /// and escaped newline business. This routine handles this complexity. 1438 /// 1439 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1440 const LangOptions &Features, 1441 const TargetInfo &Target) const; 1442 1443 typedef const SourceLocation *tokloc_iterator; 1444 tokloc_iterator tokloc_begin() const { return TokLocs; } 1445 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1446 1447 SourceRange getSourceRange() const { 1448 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1449 } 1450 static bool classof(const Stmt *T) { 1451 return T->getStmtClass() == StringLiteralClass; 1452 } 1453 static bool classof(const StringLiteral *) { return true; } 1454 1455 // Iterators 1456 child_range children() { return child_range(); } 1457}; 1458 1459/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1460/// AST node is only formed if full location information is requested. 1461class ParenExpr : public Expr { 1462 SourceLocation L, R; 1463 Stmt *Val; 1464public: 1465 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1466 : Expr(ParenExprClass, val->getType(), 1467 val->getValueKind(), val->getObjectKind(), 1468 val->isTypeDependent(), val->isValueDependent(), 1469 val->isInstantiationDependent(), 1470 val->containsUnexpandedParameterPack()), 1471 L(l), R(r), Val(val) {} 1472 1473 /// \brief Construct an empty parenthesized expression. 1474 explicit ParenExpr(EmptyShell Empty) 1475 : Expr(ParenExprClass, Empty) { } 1476 1477 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1478 Expr *getSubExpr() { return cast<Expr>(Val); } 1479 void setSubExpr(Expr *E) { Val = E; } 1480 1481 SourceRange getSourceRange() const { return SourceRange(L, R); } 1482 1483 /// \brief Get the location of the left parentheses '('. 1484 SourceLocation getLParen() const { return L; } 1485 void setLParen(SourceLocation Loc) { L = Loc; } 1486 1487 /// \brief Get the location of the right parentheses ')'. 1488 SourceLocation getRParen() const { return R; } 1489 void setRParen(SourceLocation Loc) { R = Loc; } 1490 1491 static bool classof(const Stmt *T) { 1492 return T->getStmtClass() == ParenExprClass; 1493 } 1494 static bool classof(const ParenExpr *) { return true; } 1495 1496 // Iterators 1497 child_range children() { return child_range(&Val, &Val+1); } 1498}; 1499 1500 1501/// UnaryOperator - This represents the unary-expression's (except sizeof and 1502/// alignof), the postinc/postdec operators from postfix-expression, and various 1503/// extensions. 1504/// 1505/// Notes on various nodes: 1506/// 1507/// Real/Imag - These return the real/imag part of a complex operand. If 1508/// applied to a non-complex value, the former returns its operand and the 1509/// later returns zero in the type of the operand. 1510/// 1511class UnaryOperator : public Expr { 1512public: 1513 typedef UnaryOperatorKind Opcode; 1514 1515private: 1516 unsigned Opc : 5; 1517 SourceLocation Loc; 1518 Stmt *Val; 1519public: 1520 1521 UnaryOperator(Expr *input, Opcode opc, QualType type, 1522 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1523 : Expr(UnaryOperatorClass, type, VK, OK, 1524 input->isTypeDependent() || type->isDependentType(), 1525 input->isValueDependent(), 1526 (input->isInstantiationDependent() || 1527 type->isInstantiationDependentType()), 1528 input->containsUnexpandedParameterPack()), 1529 Opc(opc), Loc(l), Val(input) {} 1530 1531 /// \brief Build an empty unary operator. 1532 explicit UnaryOperator(EmptyShell Empty) 1533 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1534 1535 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1536 void setOpcode(Opcode O) { Opc = O; } 1537 1538 Expr *getSubExpr() const { return cast<Expr>(Val); } 1539 void setSubExpr(Expr *E) { Val = E; } 1540 1541 /// getOperatorLoc - Return the location of the operator. 1542 SourceLocation getOperatorLoc() const { return Loc; } 1543 void setOperatorLoc(SourceLocation L) { Loc = L; } 1544 1545 /// isPostfix - Return true if this is a postfix operation, like x++. 1546 static bool isPostfix(Opcode Op) { 1547 return Op == UO_PostInc || Op == UO_PostDec; 1548 } 1549 1550 /// isPrefix - Return true if this is a prefix operation, like --x. 1551 static bool isPrefix(Opcode Op) { 1552 return Op == UO_PreInc || Op == UO_PreDec; 1553 } 1554 1555 bool isPrefix() const { return isPrefix(getOpcode()); } 1556 bool isPostfix() const { return isPostfix(getOpcode()); } 1557 1558 static bool isIncrementOp(Opcode Op) { 1559 return Op == UO_PreInc || Op == UO_PostInc; 1560 } 1561 bool isIncrementOp() const { 1562 return isIncrementOp(getOpcode()); 1563 } 1564 1565 static bool isDecrementOp(Opcode Op) { 1566 return Op == UO_PreDec || Op == UO_PostDec; 1567 } 1568 bool isDecrementOp() const { 1569 return isDecrementOp(getOpcode()); 1570 } 1571 1572 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1573 bool isIncrementDecrementOp() const { 1574 return isIncrementDecrementOp(getOpcode()); 1575 } 1576 1577 static bool isArithmeticOp(Opcode Op) { 1578 return Op >= UO_Plus && Op <= UO_LNot; 1579 } 1580 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1581 1582 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1583 /// corresponds to, e.g. "sizeof" or "[pre]++" 1584 static const char *getOpcodeStr(Opcode Op); 1585 1586 /// \brief Retrieve the unary opcode that corresponds to the given 1587 /// overloaded operator. 1588 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1589 1590 /// \brief Retrieve the overloaded operator kind that corresponds to 1591 /// the given unary opcode. 1592 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1593 1594 SourceRange getSourceRange() const { 1595 if (isPostfix()) 1596 return SourceRange(Val->getLocStart(), Loc); 1597 else 1598 return SourceRange(Loc, Val->getLocEnd()); 1599 } 1600 SourceLocation getExprLoc() const { return Loc; } 1601 1602 static bool classof(const Stmt *T) { 1603 return T->getStmtClass() == UnaryOperatorClass; 1604 } 1605 static bool classof(const UnaryOperator *) { return true; } 1606 1607 // Iterators 1608 child_range children() { return child_range(&Val, &Val+1); } 1609}; 1610 1611/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1612/// offsetof(record-type, member-designator). For example, given: 1613/// @code 1614/// struct S { 1615/// float f; 1616/// double d; 1617/// }; 1618/// struct T { 1619/// int i; 1620/// struct S s[10]; 1621/// }; 1622/// @endcode 1623/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1624 1625class OffsetOfExpr : public Expr { 1626public: 1627 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1628 class OffsetOfNode { 1629 public: 1630 /// \brief The kind of offsetof node we have. 1631 enum Kind { 1632 /// \brief An index into an array. 1633 Array = 0x00, 1634 /// \brief A field. 1635 Field = 0x01, 1636 /// \brief A field in a dependent type, known only by its name. 1637 Identifier = 0x02, 1638 /// \brief An implicit indirection through a C++ base class, when the 1639 /// field found is in a base class. 1640 Base = 0x03 1641 }; 1642 1643 private: 1644 enum { MaskBits = 2, Mask = 0x03 }; 1645 1646 /// \brief The source range that covers this part of the designator. 1647 SourceRange Range; 1648 1649 /// \brief The data describing the designator, which comes in three 1650 /// different forms, depending on the lower two bits. 1651 /// - An unsigned index into the array of Expr*'s stored after this node 1652 /// in memory, for [constant-expression] designators. 1653 /// - A FieldDecl*, for references to a known field. 1654 /// - An IdentifierInfo*, for references to a field with a given name 1655 /// when the class type is dependent. 1656 /// - A CXXBaseSpecifier*, for references that look at a field in a 1657 /// base class. 1658 uintptr_t Data; 1659 1660 public: 1661 /// \brief Create an offsetof node that refers to an array element. 1662 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1663 SourceLocation RBracketLoc) 1664 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1665 1666 /// \brief Create an offsetof node that refers to a field. 1667 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1668 SourceLocation NameLoc) 1669 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1670 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1671 1672 /// \brief Create an offsetof node that refers to an identifier. 1673 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1674 SourceLocation NameLoc) 1675 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1676 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1677 1678 /// \brief Create an offsetof node that refers into a C++ base class. 1679 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1680 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1681 1682 /// \brief Determine what kind of offsetof node this is. 1683 Kind getKind() const { 1684 return static_cast<Kind>(Data & Mask); 1685 } 1686 1687 /// \brief For an array element node, returns the index into the array 1688 /// of expressions. 1689 unsigned getArrayExprIndex() const { 1690 assert(getKind() == Array); 1691 return Data >> 2; 1692 } 1693 1694 /// \brief For a field offsetof node, returns the field. 1695 FieldDecl *getField() const { 1696 assert(getKind() == Field); 1697 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1698 } 1699 1700 /// \brief For a field or identifier offsetof node, returns the name of 1701 /// the field. 1702 IdentifierInfo *getFieldName() const; 1703 1704 /// \brief For a base class node, returns the base specifier. 1705 CXXBaseSpecifier *getBase() const { 1706 assert(getKind() == Base); 1707 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1708 } 1709 1710 /// \brief Retrieve the source range that covers this offsetof node. 1711 /// 1712 /// For an array element node, the source range contains the locations of 1713 /// the square brackets. For a field or identifier node, the source range 1714 /// contains the location of the period (if there is one) and the 1715 /// identifier. 1716 SourceRange getSourceRange() const { return Range; } 1717 }; 1718 1719private: 1720 1721 SourceLocation OperatorLoc, RParenLoc; 1722 // Base type; 1723 TypeSourceInfo *TSInfo; 1724 // Number of sub-components (i.e. instances of OffsetOfNode). 1725 unsigned NumComps; 1726 // Number of sub-expressions (i.e. array subscript expressions). 1727 unsigned NumExprs; 1728 1729 OffsetOfExpr(ASTContext &C, QualType type, 1730 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1731 OffsetOfNode* compsPtr, unsigned numComps, 1732 Expr** exprsPtr, unsigned numExprs, 1733 SourceLocation RParenLoc); 1734 1735 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1736 : Expr(OffsetOfExprClass, EmptyShell()), 1737 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1738 1739public: 1740 1741 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1742 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1743 OffsetOfNode* compsPtr, unsigned numComps, 1744 Expr** exprsPtr, unsigned numExprs, 1745 SourceLocation RParenLoc); 1746 1747 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1748 unsigned NumComps, unsigned NumExprs); 1749 1750 /// getOperatorLoc - Return the location of the operator. 1751 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1752 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1753 1754 /// \brief Return the location of the right parentheses. 1755 SourceLocation getRParenLoc() const { return RParenLoc; } 1756 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1757 1758 TypeSourceInfo *getTypeSourceInfo() const { 1759 return TSInfo; 1760 } 1761 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1762 TSInfo = tsi; 1763 } 1764 1765 const OffsetOfNode &getComponent(unsigned Idx) const { 1766 assert(Idx < NumComps && "Subscript out of range"); 1767 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1768 } 1769 1770 void setComponent(unsigned Idx, OffsetOfNode ON) { 1771 assert(Idx < NumComps && "Subscript out of range"); 1772 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1773 } 1774 1775 unsigned getNumComponents() const { 1776 return NumComps; 1777 } 1778 1779 Expr* getIndexExpr(unsigned Idx) { 1780 assert(Idx < NumExprs && "Subscript out of range"); 1781 return reinterpret_cast<Expr **>( 1782 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1783 } 1784 const Expr *getIndexExpr(unsigned Idx) const { 1785 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1786 } 1787 1788 void setIndexExpr(unsigned Idx, Expr* E) { 1789 assert(Idx < NumComps && "Subscript out of range"); 1790 reinterpret_cast<Expr **>( 1791 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1792 } 1793 1794 unsigned getNumExpressions() const { 1795 return NumExprs; 1796 } 1797 1798 SourceRange getSourceRange() const { 1799 return SourceRange(OperatorLoc, RParenLoc); 1800 } 1801 1802 static bool classof(const Stmt *T) { 1803 return T->getStmtClass() == OffsetOfExprClass; 1804 } 1805 1806 static bool classof(const OffsetOfExpr *) { return true; } 1807 1808 // Iterators 1809 child_range children() { 1810 Stmt **begin = 1811 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1812 + NumComps); 1813 return child_range(begin, begin + NumExprs); 1814 } 1815}; 1816 1817/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1818/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1819/// vec_step (OpenCL 1.1 6.11.12). 1820class UnaryExprOrTypeTraitExpr : public Expr { 1821 unsigned Kind : 2; 1822 bool isType : 1; // true if operand is a type, false if an expression 1823 union { 1824 TypeSourceInfo *Ty; 1825 Stmt *Ex; 1826 } Argument; 1827 SourceLocation OpLoc, RParenLoc; 1828 1829public: 1830 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1831 QualType resultType, SourceLocation op, 1832 SourceLocation rp) : 1833 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1834 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1835 // Value-dependent if the argument is type-dependent. 1836 TInfo->getType()->isDependentType(), 1837 TInfo->getType()->isInstantiationDependentType(), 1838 TInfo->getType()->containsUnexpandedParameterPack()), 1839 Kind(ExprKind), isType(true), OpLoc(op), RParenLoc(rp) { 1840 Argument.Ty = TInfo; 1841 } 1842 1843 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1844 QualType resultType, SourceLocation op, 1845 SourceLocation rp) : 1846 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1847 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1848 // Value-dependent if the argument is type-dependent. 1849 E->isTypeDependent(), 1850 E->isInstantiationDependent(), 1851 E->containsUnexpandedParameterPack()), 1852 Kind(ExprKind), isType(false), OpLoc(op), RParenLoc(rp) { 1853 Argument.Ex = E; 1854 } 1855 1856 /// \brief Construct an empty sizeof/alignof expression. 1857 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1858 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1859 1860 UnaryExprOrTypeTrait getKind() const { 1861 return static_cast<UnaryExprOrTypeTrait>(Kind); 1862 } 1863 void setKind(UnaryExprOrTypeTrait K) { Kind = K; } 1864 1865 bool isArgumentType() const { return isType; } 1866 QualType getArgumentType() const { 1867 return getArgumentTypeInfo()->getType(); 1868 } 1869 TypeSourceInfo *getArgumentTypeInfo() const { 1870 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1871 return Argument.Ty; 1872 } 1873 Expr *getArgumentExpr() { 1874 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1875 return static_cast<Expr*>(Argument.Ex); 1876 } 1877 const Expr *getArgumentExpr() const { 1878 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1879 } 1880 1881 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1882 void setArgument(TypeSourceInfo *TInfo) { 1883 Argument.Ty = TInfo; 1884 isType = true; 1885 } 1886 1887 /// Gets the argument type, or the type of the argument expression, whichever 1888 /// is appropriate. 1889 QualType getTypeOfArgument() const { 1890 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1891 } 1892 1893 SourceLocation getOperatorLoc() const { return OpLoc; } 1894 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1895 1896 SourceLocation getRParenLoc() const { return RParenLoc; } 1897 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1898 1899 SourceRange getSourceRange() const { 1900 return SourceRange(OpLoc, RParenLoc); 1901 } 1902 1903 static bool classof(const Stmt *T) { 1904 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1905 } 1906 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1907 1908 // Iterators 1909 child_range children(); 1910}; 1911 1912//===----------------------------------------------------------------------===// 1913// Postfix Operators. 1914//===----------------------------------------------------------------------===// 1915 1916/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1917class ArraySubscriptExpr : public Expr { 1918 enum { LHS, RHS, END_EXPR=2 }; 1919 Stmt* SubExprs[END_EXPR]; 1920 SourceLocation RBracketLoc; 1921public: 1922 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1923 ExprValueKind VK, ExprObjectKind OK, 1924 SourceLocation rbracketloc) 1925 : Expr(ArraySubscriptExprClass, t, VK, OK, 1926 lhs->isTypeDependent() || rhs->isTypeDependent(), 1927 lhs->isValueDependent() || rhs->isValueDependent(), 1928 (lhs->isInstantiationDependent() || 1929 rhs->isInstantiationDependent()), 1930 (lhs->containsUnexpandedParameterPack() || 1931 rhs->containsUnexpandedParameterPack())), 1932 RBracketLoc(rbracketloc) { 1933 SubExprs[LHS] = lhs; 1934 SubExprs[RHS] = rhs; 1935 } 1936 1937 /// \brief Create an empty array subscript expression. 1938 explicit ArraySubscriptExpr(EmptyShell Shell) 1939 : Expr(ArraySubscriptExprClass, Shell) { } 1940 1941 /// An array access can be written A[4] or 4[A] (both are equivalent). 1942 /// - getBase() and getIdx() always present the normalized view: A[4]. 1943 /// In this case getBase() returns "A" and getIdx() returns "4". 1944 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1945 /// 4[A] getLHS() returns "4". 1946 /// Note: Because vector element access is also written A[4] we must 1947 /// predicate the format conversion in getBase and getIdx only on the 1948 /// the type of the RHS, as it is possible for the LHS to be a vector of 1949 /// integer type 1950 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1951 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1952 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1953 1954 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1955 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1956 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1957 1958 Expr *getBase() { 1959 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1960 } 1961 1962 const Expr *getBase() const { 1963 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1964 } 1965 1966 Expr *getIdx() { 1967 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1968 } 1969 1970 const Expr *getIdx() const { 1971 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1972 } 1973 1974 SourceRange getSourceRange() const { 1975 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1976 } 1977 1978 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1979 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1980 1981 SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1982 1983 static bool classof(const Stmt *T) { 1984 return T->getStmtClass() == ArraySubscriptExprClass; 1985 } 1986 static bool classof(const ArraySubscriptExpr *) { return true; } 1987 1988 // Iterators 1989 child_range children() { 1990 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 1991 } 1992}; 1993 1994 1995/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1996/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1997/// while its subclasses may represent alternative syntax that (semantically) 1998/// results in a function call. For example, CXXOperatorCallExpr is 1999/// a subclass for overloaded operator calls that use operator syntax, e.g., 2000/// "str1 + str2" to resolve to a function call. 2001class CallExpr : public Expr { 2002 enum { FN=0, PREARGS_START=1 }; 2003 Stmt **SubExprs; 2004 unsigned NumArgs; 2005 SourceLocation RParenLoc; 2006 2007protected: 2008 // These versions of the constructor are for derived classes. 2009 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 2010 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 2011 SourceLocation rparenloc); 2012 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 2013 2014 Stmt *getPreArg(unsigned i) { 2015 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2016 return SubExprs[PREARGS_START+i]; 2017 } 2018 const Stmt *getPreArg(unsigned i) const { 2019 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2020 return SubExprs[PREARGS_START+i]; 2021 } 2022 void setPreArg(unsigned i, Stmt *PreArg) { 2023 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2024 SubExprs[PREARGS_START+i] = PreArg; 2025 } 2026 2027 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2028 2029public: 2030 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 2031 ExprValueKind VK, SourceLocation rparenloc); 2032 2033 /// \brief Build an empty call expression. 2034 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 2035 2036 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2037 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2038 void setCallee(Expr *F) { SubExprs[FN] = F; } 2039 2040 Decl *getCalleeDecl(); 2041 const Decl *getCalleeDecl() const { 2042 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2043 } 2044 2045 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2046 FunctionDecl *getDirectCallee(); 2047 const FunctionDecl *getDirectCallee() const { 2048 return const_cast<CallExpr*>(this)->getDirectCallee(); 2049 } 2050 2051 /// getNumArgs - Return the number of actual arguments to this call. 2052 /// 2053 unsigned getNumArgs() const { return NumArgs; } 2054 2055 /// \brief Retrieve the call arguments. 2056 Expr **getArgs() { 2057 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2058 } 2059 const Expr *const *getArgs() const { 2060 return const_cast<CallExpr*>(this)->getArgs(); 2061 } 2062 2063 /// getArg - Return the specified argument. 2064 Expr *getArg(unsigned Arg) { 2065 assert(Arg < NumArgs && "Arg access out of range!"); 2066 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2067 } 2068 const Expr *getArg(unsigned Arg) const { 2069 assert(Arg < NumArgs && "Arg access out of range!"); 2070 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2071 } 2072 2073 /// setArg - Set the specified argument. 2074 void setArg(unsigned Arg, Expr *ArgExpr) { 2075 assert(Arg < NumArgs && "Arg access out of range!"); 2076 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2077 } 2078 2079 /// setNumArgs - This changes the number of arguments present in this call. 2080 /// Any orphaned expressions are deleted by this, and any new operands are set 2081 /// to null. 2082 void setNumArgs(ASTContext& C, unsigned NumArgs); 2083 2084 typedef ExprIterator arg_iterator; 2085 typedef ConstExprIterator const_arg_iterator; 2086 2087 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2088 arg_iterator arg_end() { 2089 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2090 } 2091 const_arg_iterator arg_begin() const { 2092 return SubExprs+PREARGS_START+getNumPreArgs(); 2093 } 2094 const_arg_iterator arg_end() const { 2095 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2096 } 2097 2098 /// getNumCommas - Return the number of commas that must have been present in 2099 /// this function call. 2100 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2101 2102 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2103 /// not, return 0. 2104 unsigned isBuiltinCall() const; 2105 2106 /// getCallReturnType - Get the return type of the call expr. This is not 2107 /// always the type of the expr itself, if the return type is a reference 2108 /// type. 2109 QualType getCallReturnType() const; 2110 2111 SourceLocation getRParenLoc() const { return RParenLoc; } 2112 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2113 2114 SourceRange getSourceRange() const; 2115 2116 static bool classof(const Stmt *T) { 2117 return T->getStmtClass() >= firstCallExprConstant && 2118 T->getStmtClass() <= lastCallExprConstant; 2119 } 2120 static bool classof(const CallExpr *) { return true; } 2121 2122 // Iterators 2123 child_range children() { 2124 return child_range(&SubExprs[0], 2125 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2126 } 2127}; 2128 2129/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2130/// 2131class MemberExpr : public Expr { 2132 /// Extra data stored in some member expressions. 2133 struct MemberNameQualifier { 2134 /// \brief The nested-name-specifier that qualifies the name, including 2135 /// source-location information. 2136 NestedNameSpecifierLoc QualifierLoc; 2137 2138 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2139 /// name qualifiers. 2140 DeclAccessPair FoundDecl; 2141 }; 2142 2143 /// Base - the expression for the base pointer or structure references. In 2144 /// X.F, this is "X". 2145 Stmt *Base; 2146 2147 /// MemberDecl - This is the decl being referenced by the field/member name. 2148 /// In X.F, this is the decl referenced by F. 2149 ValueDecl *MemberDecl; 2150 2151 /// MemberLoc - This is the location of the member name. 2152 SourceLocation MemberLoc; 2153 2154 /// MemberDNLoc - Provides source/type location info for the 2155 /// declaration name embedded in MemberDecl. 2156 DeclarationNameLoc MemberDNLoc; 2157 2158 /// IsArrow - True if this is "X->F", false if this is "X.F". 2159 bool IsArrow : 1; 2160 2161 /// \brief True if this member expression used a nested-name-specifier to 2162 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2163 /// declaration. When true, a MemberNameQualifier 2164 /// structure is allocated immediately after the MemberExpr. 2165 bool HasQualifierOrFoundDecl : 1; 2166 2167 /// \brief True if this member expression specified a template keyword 2168 /// and/or a template argument list explicitly, e.g., x->f<int>, 2169 /// x->template f, x->template f<int>. 2170 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2171 /// TemplateArguments (if any) are allocated immediately after 2172 /// the MemberExpr or, if the member expression also has a qualifier, 2173 /// after the MemberNameQualifier structure. 2174 bool HasTemplateKWAndArgsInfo : 1; 2175 2176 /// \brief True if this member expression refers to a method that 2177 /// was resolved from an overloaded set having size greater than 1. 2178 bool HadMultipleCandidates : 1; 2179 2180 /// \brief Retrieve the qualifier that preceded the member name, if any. 2181 MemberNameQualifier *getMemberQualifier() { 2182 assert(HasQualifierOrFoundDecl); 2183 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2184 } 2185 2186 /// \brief Retrieve the qualifier that preceded the member name, if any. 2187 const MemberNameQualifier *getMemberQualifier() const { 2188 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2189 } 2190 2191public: 2192 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2193 const DeclarationNameInfo &NameInfo, QualType ty, 2194 ExprValueKind VK, ExprObjectKind OK) 2195 : Expr(MemberExprClass, ty, VK, OK, 2196 base->isTypeDependent(), 2197 base->isValueDependent(), 2198 base->isInstantiationDependent(), 2199 base->containsUnexpandedParameterPack()), 2200 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 2201 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 2202 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2203 HadMultipleCandidates(false) { 2204 assert(memberdecl->getDeclName() == NameInfo.getName()); 2205 } 2206 2207 // NOTE: this constructor should be used only when it is known that 2208 // the member name can not provide additional syntactic info 2209 // (i.e., source locations for C++ operator names or type source info 2210 // for constructors, destructors and conversion operators). 2211 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2212 SourceLocation l, QualType ty, 2213 ExprValueKind VK, ExprObjectKind OK) 2214 : Expr(MemberExprClass, ty, VK, OK, 2215 base->isTypeDependent(), base->isValueDependent(), 2216 base->isInstantiationDependent(), 2217 base->containsUnexpandedParameterPack()), 2218 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 2219 IsArrow(isarrow), 2220 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2221 HadMultipleCandidates(false) {} 2222 2223 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2224 NestedNameSpecifierLoc QualifierLoc, 2225 SourceLocation TemplateKWLoc, 2226 ValueDecl *memberdecl, DeclAccessPair founddecl, 2227 DeclarationNameInfo MemberNameInfo, 2228 const TemplateArgumentListInfo *targs, 2229 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2230 2231 void setBase(Expr *E) { Base = E; } 2232 Expr *getBase() const { return cast<Expr>(Base); } 2233 2234 /// \brief Retrieve the member declaration to which this expression refers. 2235 /// 2236 /// The returned declaration will either be a FieldDecl or (in C++) 2237 /// a CXXMethodDecl. 2238 ValueDecl *getMemberDecl() const { return MemberDecl; } 2239 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2240 2241 /// \brief Retrieves the declaration found by lookup. 2242 DeclAccessPair getFoundDecl() const { 2243 if (!HasQualifierOrFoundDecl) 2244 return DeclAccessPair::make(getMemberDecl(), 2245 getMemberDecl()->getAccess()); 2246 return getMemberQualifier()->FoundDecl; 2247 } 2248 2249 /// \brief Determines whether this member expression actually had 2250 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2251 /// x->Base::foo. 2252 bool hasQualifier() const { return getQualifier() != 0; } 2253 2254 /// \brief If the member name was qualified, retrieves the 2255 /// nested-name-specifier that precedes the member name. Otherwise, returns 2256 /// NULL. 2257 NestedNameSpecifier *getQualifier() const { 2258 if (!HasQualifierOrFoundDecl) 2259 return 0; 2260 2261 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2262 } 2263 2264 /// \brief If the member name was qualified, retrieves the 2265 /// nested-name-specifier that precedes the member name, with source-location 2266 /// information. 2267 NestedNameSpecifierLoc getQualifierLoc() const { 2268 if (!hasQualifier()) 2269 return NestedNameSpecifierLoc(); 2270 2271 return getMemberQualifier()->QualifierLoc; 2272 } 2273 2274 /// \brief Return the optional template keyword and arguments info. 2275 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 2276 if (!HasTemplateKWAndArgsInfo) 2277 return 0; 2278 2279 if (!HasQualifierOrFoundDecl) 2280 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 2281 2282 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 2283 getMemberQualifier() + 1); 2284 } 2285 2286 /// \brief Return the optional template keyword and arguments info. 2287 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 2288 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo(); 2289 } 2290 2291 /// \brief Retrieve the location of the template keyword preceding 2292 /// the member name, if any. 2293 SourceLocation getTemplateKeywordLoc() const { 2294 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2295 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 2296 } 2297 2298 /// \brief Retrieve the location of the left angle bracket starting the 2299 /// explicit template argument list following the member name, if any. 2300 SourceLocation getLAngleLoc() const { 2301 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2302 return getTemplateKWAndArgsInfo()->LAngleLoc; 2303 } 2304 2305 /// \brief Retrieve the location of the right angle bracket ending the 2306 /// explicit template argument list following the member name, if any. 2307 SourceLocation getRAngleLoc() const { 2308 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2309 return getTemplateKWAndArgsInfo()->RAngleLoc; 2310 } 2311 2312 /// Determines whether the member name was preceded by the template keyword. 2313 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2314 2315 /// \brief Determines whether the member name was followed by an 2316 /// explicit template argument list. 2317 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2318 2319 /// \brief Copies the template arguments (if present) into the given 2320 /// structure. 2321 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2322 if (hasExplicitTemplateArgs()) 2323 getExplicitTemplateArgs().copyInto(List); 2324 } 2325 2326 /// \brief Retrieve the explicit template argument list that 2327 /// follow the member template name. This must only be called on an 2328 /// expression with explicit template arguments. 2329 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2330 assert(hasExplicitTemplateArgs()); 2331 return *getTemplateKWAndArgsInfo(); 2332 } 2333 2334 /// \brief Retrieve the explicit template argument list that 2335 /// followed the member template name. This must only be called on 2336 /// an expression with explicit template arguments. 2337 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2338 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2339 } 2340 2341 /// \brief Retrieves the optional explicit template arguments. 2342 /// This points to the same data as getExplicitTemplateArgs(), but 2343 /// returns null if there are no explicit template arguments. 2344 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2345 if (!hasExplicitTemplateArgs()) return 0; 2346 return &getExplicitTemplateArgs(); 2347 } 2348 2349 /// \brief Retrieve the template arguments provided as part of this 2350 /// template-id. 2351 const TemplateArgumentLoc *getTemplateArgs() const { 2352 if (!hasExplicitTemplateArgs()) 2353 return 0; 2354 2355 return getExplicitTemplateArgs().getTemplateArgs(); 2356 } 2357 2358 /// \brief Retrieve the number of template arguments provided as part of this 2359 /// template-id. 2360 unsigned getNumTemplateArgs() const { 2361 if (!hasExplicitTemplateArgs()) 2362 return 0; 2363 2364 return getExplicitTemplateArgs().NumTemplateArgs; 2365 } 2366 2367 /// \brief Retrieve the member declaration name info. 2368 DeclarationNameInfo getMemberNameInfo() const { 2369 return DeclarationNameInfo(MemberDecl->getDeclName(), 2370 MemberLoc, MemberDNLoc); 2371 } 2372 2373 bool isArrow() const { return IsArrow; } 2374 void setArrow(bool A) { IsArrow = A; } 2375 2376 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2377 /// location of 'F'. 2378 SourceLocation getMemberLoc() const { return MemberLoc; } 2379 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2380 2381 SourceRange getSourceRange() const; 2382 2383 SourceLocation getExprLoc() const { return MemberLoc; } 2384 2385 /// \brief Determine whether the base of this explicit is implicit. 2386 bool isImplicitAccess() const { 2387 return getBase() && getBase()->isImplicitCXXThis(); 2388 } 2389 2390 /// \brief Returns true if this member expression refers to a method that 2391 /// was resolved from an overloaded set having size greater than 1. 2392 bool hadMultipleCandidates() const { 2393 return HadMultipleCandidates; 2394 } 2395 /// \brief Sets the flag telling whether this expression refers to 2396 /// a method that was resolved from an overloaded set having size 2397 /// greater than 1. 2398 void setHadMultipleCandidates(bool V = true) { 2399 HadMultipleCandidates = V; 2400 } 2401 2402 static bool classof(const Stmt *T) { 2403 return T->getStmtClass() == MemberExprClass; 2404 } 2405 static bool classof(const MemberExpr *) { return true; } 2406 2407 // Iterators 2408 child_range children() { return child_range(&Base, &Base+1); } 2409 2410 friend class ASTReader; 2411 friend class ASTStmtWriter; 2412}; 2413 2414/// CompoundLiteralExpr - [C99 6.5.2.5] 2415/// 2416class CompoundLiteralExpr : public Expr { 2417 /// LParenLoc - If non-null, this is the location of the left paren in a 2418 /// compound literal like "(int){4}". This can be null if this is a 2419 /// synthesized compound expression. 2420 SourceLocation LParenLoc; 2421 2422 /// The type as written. This can be an incomplete array type, in 2423 /// which case the actual expression type will be different. 2424 TypeSourceInfo *TInfo; 2425 Stmt *Init; 2426 bool FileScope; 2427public: 2428 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2429 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2430 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2431 tinfo->getType()->isDependentType(), 2432 init->isValueDependent(), 2433 (init->isInstantiationDependent() || 2434 tinfo->getType()->isInstantiationDependentType()), 2435 init->containsUnexpandedParameterPack()), 2436 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2437 2438 /// \brief Construct an empty compound literal. 2439 explicit CompoundLiteralExpr(EmptyShell Empty) 2440 : Expr(CompoundLiteralExprClass, Empty) { } 2441 2442 const Expr *getInitializer() const { return cast<Expr>(Init); } 2443 Expr *getInitializer() { return cast<Expr>(Init); } 2444 void setInitializer(Expr *E) { Init = E; } 2445 2446 bool isFileScope() const { return FileScope; } 2447 void setFileScope(bool FS) { FileScope = FS; } 2448 2449 SourceLocation getLParenLoc() const { return LParenLoc; } 2450 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2451 2452 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2453 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2454 2455 SourceRange getSourceRange() const { 2456 // FIXME: Init should never be null. 2457 if (!Init) 2458 return SourceRange(); 2459 if (LParenLoc.isInvalid()) 2460 return Init->getSourceRange(); 2461 return SourceRange(LParenLoc, Init->getLocEnd()); 2462 } 2463 2464 static bool classof(const Stmt *T) { 2465 return T->getStmtClass() == CompoundLiteralExprClass; 2466 } 2467 static bool classof(const CompoundLiteralExpr *) { return true; } 2468 2469 // Iterators 2470 child_range children() { return child_range(&Init, &Init+1); } 2471}; 2472 2473/// CastExpr - Base class for type casts, including both implicit 2474/// casts (ImplicitCastExpr) and explicit casts that have some 2475/// representation in the source code (ExplicitCastExpr's derived 2476/// classes). 2477class CastExpr : public Expr { 2478public: 2479 typedef clang::CastKind CastKind; 2480 2481private: 2482 Stmt *Op; 2483 2484 void CheckCastConsistency() const; 2485 2486 const CXXBaseSpecifier * const *path_buffer() const { 2487 return const_cast<CastExpr*>(this)->path_buffer(); 2488 } 2489 CXXBaseSpecifier **path_buffer(); 2490 2491 void setBasePathSize(unsigned basePathSize) { 2492 CastExprBits.BasePathSize = basePathSize; 2493 assert(CastExprBits.BasePathSize == basePathSize && 2494 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2495 } 2496 2497protected: 2498 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2499 const CastKind kind, Expr *op, unsigned BasePathSize) : 2500 Expr(SC, ty, VK, OK_Ordinary, 2501 // Cast expressions are type-dependent if the type is 2502 // dependent (C++ [temp.dep.expr]p3). 2503 ty->isDependentType(), 2504 // Cast expressions are value-dependent if the type is 2505 // dependent or if the subexpression is value-dependent. 2506 ty->isDependentType() || (op && op->isValueDependent()), 2507 (ty->isInstantiationDependentType() || 2508 (op && op->isInstantiationDependent())), 2509 (ty->containsUnexpandedParameterPack() || 2510 op->containsUnexpandedParameterPack())), 2511 Op(op) { 2512 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2513 CastExprBits.Kind = kind; 2514 setBasePathSize(BasePathSize); 2515#ifndef NDEBUG 2516 CheckCastConsistency(); 2517#endif 2518 } 2519 2520 /// \brief Construct an empty cast. 2521 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2522 : Expr(SC, Empty) { 2523 setBasePathSize(BasePathSize); 2524 } 2525 2526public: 2527 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2528 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2529 const char *getCastKindName() const; 2530 2531 Expr *getSubExpr() { return cast<Expr>(Op); } 2532 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2533 void setSubExpr(Expr *E) { Op = E; } 2534 2535 /// \brief Retrieve the cast subexpression as it was written in the source 2536 /// code, looking through any implicit casts or other intermediate nodes 2537 /// introduced by semantic analysis. 2538 Expr *getSubExprAsWritten(); 2539 const Expr *getSubExprAsWritten() const { 2540 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2541 } 2542 2543 typedef CXXBaseSpecifier **path_iterator; 2544 typedef const CXXBaseSpecifier * const *path_const_iterator; 2545 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2546 unsigned path_size() const { return CastExprBits.BasePathSize; } 2547 path_iterator path_begin() { return path_buffer(); } 2548 path_iterator path_end() { return path_buffer() + path_size(); } 2549 path_const_iterator path_begin() const { return path_buffer(); } 2550 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2551 2552 void setCastPath(const CXXCastPath &Path); 2553 2554 static bool classof(const Stmt *T) { 2555 return T->getStmtClass() >= firstCastExprConstant && 2556 T->getStmtClass() <= lastCastExprConstant; 2557 } 2558 static bool classof(const CastExpr *) { return true; } 2559 2560 // Iterators 2561 child_range children() { return child_range(&Op, &Op+1); } 2562}; 2563 2564/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2565/// conversions, which have no direct representation in the original 2566/// source code. For example: converting T[]->T*, void f()->void 2567/// (*f)(), float->double, short->int, etc. 2568/// 2569/// In C, implicit casts always produce rvalues. However, in C++, an 2570/// implicit cast whose result is being bound to a reference will be 2571/// an lvalue or xvalue. For example: 2572/// 2573/// @code 2574/// class Base { }; 2575/// class Derived : public Base { }; 2576/// Derived &&ref(); 2577/// void f(Derived d) { 2578/// Base& b = d; // initializer is an ImplicitCastExpr 2579/// // to an lvalue of type Base 2580/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2581/// // to an xvalue of type Base 2582/// } 2583/// @endcode 2584class ImplicitCastExpr : public CastExpr { 2585private: 2586 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2587 unsigned BasePathLength, ExprValueKind VK) 2588 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2589 } 2590 2591 /// \brief Construct an empty implicit cast. 2592 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2593 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2594 2595public: 2596 enum OnStack_t { OnStack }; 2597 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2598 ExprValueKind VK) 2599 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2600 } 2601 2602 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2603 CastKind Kind, Expr *Operand, 2604 const CXXCastPath *BasePath, 2605 ExprValueKind Cat); 2606 2607 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2608 2609 SourceRange getSourceRange() const { 2610 return getSubExpr()->getSourceRange(); 2611 } 2612 2613 static bool classof(const Stmt *T) { 2614 return T->getStmtClass() == ImplicitCastExprClass; 2615 } 2616 static bool classof(const ImplicitCastExpr *) { return true; } 2617}; 2618 2619inline Expr *Expr::IgnoreImpCasts() { 2620 Expr *e = this; 2621 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2622 e = ice->getSubExpr(); 2623 return e; 2624} 2625 2626/// ExplicitCastExpr - An explicit cast written in the source 2627/// code. 2628/// 2629/// This class is effectively an abstract class, because it provides 2630/// the basic representation of an explicitly-written cast without 2631/// specifying which kind of cast (C cast, functional cast, static 2632/// cast, etc.) was written; specific derived classes represent the 2633/// particular style of cast and its location information. 2634/// 2635/// Unlike implicit casts, explicit cast nodes have two different 2636/// types: the type that was written into the source code, and the 2637/// actual type of the expression as determined by semantic 2638/// analysis. These types may differ slightly. For example, in C++ one 2639/// can cast to a reference type, which indicates that the resulting 2640/// expression will be an lvalue or xvalue. The reference type, however, 2641/// will not be used as the type of the expression. 2642class ExplicitCastExpr : public CastExpr { 2643 /// TInfo - Source type info for the (written) type 2644 /// this expression is casting to. 2645 TypeSourceInfo *TInfo; 2646 2647protected: 2648 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2649 CastKind kind, Expr *op, unsigned PathSize, 2650 TypeSourceInfo *writtenTy) 2651 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2652 2653 /// \brief Construct an empty explicit cast. 2654 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2655 : CastExpr(SC, Shell, PathSize) { } 2656 2657public: 2658 /// getTypeInfoAsWritten - Returns the type source info for the type 2659 /// that this expression is casting to. 2660 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2661 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2662 2663 /// getTypeAsWritten - Returns the type that this expression is 2664 /// casting to, as written in the source code. 2665 QualType getTypeAsWritten() const { return TInfo->getType(); } 2666 2667 static bool classof(const Stmt *T) { 2668 return T->getStmtClass() >= firstExplicitCastExprConstant && 2669 T->getStmtClass() <= lastExplicitCastExprConstant; 2670 } 2671 static bool classof(const ExplicitCastExpr *) { return true; } 2672}; 2673 2674/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2675/// cast in C++ (C++ [expr.cast]), which uses the syntax 2676/// (Type)expr. For example: @c (int)f. 2677class CStyleCastExpr : public ExplicitCastExpr { 2678 SourceLocation LPLoc; // the location of the left paren 2679 SourceLocation RPLoc; // the location of the right paren 2680 2681 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2682 unsigned PathSize, TypeSourceInfo *writtenTy, 2683 SourceLocation l, SourceLocation r) 2684 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2685 writtenTy), LPLoc(l), RPLoc(r) {} 2686 2687 /// \brief Construct an empty C-style explicit cast. 2688 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2689 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2690 2691public: 2692 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2693 ExprValueKind VK, CastKind K, 2694 Expr *Op, const CXXCastPath *BasePath, 2695 TypeSourceInfo *WrittenTy, SourceLocation L, 2696 SourceLocation R); 2697 2698 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2699 2700 SourceLocation getLParenLoc() const { return LPLoc; } 2701 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2702 2703 SourceLocation getRParenLoc() const { return RPLoc; } 2704 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2705 2706 SourceRange getSourceRange() const { 2707 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2708 } 2709 static bool classof(const Stmt *T) { 2710 return T->getStmtClass() == CStyleCastExprClass; 2711 } 2712 static bool classof(const CStyleCastExpr *) { return true; } 2713}; 2714 2715/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2716/// 2717/// This expression node kind describes a builtin binary operation, 2718/// such as "x + y" for integer values "x" and "y". The operands will 2719/// already have been converted to appropriate types (e.g., by 2720/// performing promotions or conversions). 2721/// 2722/// In C++, where operators may be overloaded, a different kind of 2723/// expression node (CXXOperatorCallExpr) is used to express the 2724/// invocation of an overloaded operator with operator syntax. Within 2725/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2726/// used to store an expression "x + y" depends on the subexpressions 2727/// for x and y. If neither x or y is type-dependent, and the "+" 2728/// operator resolves to a built-in operation, BinaryOperator will be 2729/// used to express the computation (x and y may still be 2730/// value-dependent). If either x or y is type-dependent, or if the 2731/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2732/// be used to express the computation. 2733class BinaryOperator : public Expr { 2734public: 2735 typedef BinaryOperatorKind Opcode; 2736 2737private: 2738 unsigned Opc : 6; 2739 SourceLocation OpLoc; 2740 2741 enum { LHS, RHS, END_EXPR }; 2742 Stmt* SubExprs[END_EXPR]; 2743public: 2744 2745 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2746 ExprValueKind VK, ExprObjectKind OK, 2747 SourceLocation opLoc) 2748 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2749 lhs->isTypeDependent() || rhs->isTypeDependent(), 2750 lhs->isValueDependent() || rhs->isValueDependent(), 2751 (lhs->isInstantiationDependent() || 2752 rhs->isInstantiationDependent()), 2753 (lhs->containsUnexpandedParameterPack() || 2754 rhs->containsUnexpandedParameterPack())), 2755 Opc(opc), OpLoc(opLoc) { 2756 SubExprs[LHS] = lhs; 2757 SubExprs[RHS] = rhs; 2758 assert(!isCompoundAssignmentOp() && 2759 "Use ArithAssignBinaryOperator for compound assignments"); 2760 } 2761 2762 /// \brief Construct an empty binary operator. 2763 explicit BinaryOperator(EmptyShell Empty) 2764 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2765 2766 SourceLocation getExprLoc() const { return OpLoc; } 2767 SourceLocation getOperatorLoc() const { return OpLoc; } 2768 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2769 2770 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2771 void setOpcode(Opcode O) { Opc = O; } 2772 2773 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2774 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2775 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2776 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2777 2778 SourceRange getSourceRange() const { 2779 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2780 } 2781 2782 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2783 /// corresponds to, e.g. "<<=". 2784 static const char *getOpcodeStr(Opcode Op); 2785 2786 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2787 2788 /// \brief Retrieve the binary opcode that corresponds to the given 2789 /// overloaded operator. 2790 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2791 2792 /// \brief Retrieve the overloaded operator kind that corresponds to 2793 /// the given binary opcode. 2794 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2795 2796 /// predicates to categorize the respective opcodes. 2797 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2798 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2799 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2800 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2801 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2802 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2803 2804 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2805 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2806 2807 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2808 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2809 2810 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2811 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2812 2813 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2814 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2815 2816 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2817 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2818 2819 static bool isAssignmentOp(Opcode Opc) { 2820 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2821 } 2822 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2823 2824 static bool isCompoundAssignmentOp(Opcode Opc) { 2825 return Opc > BO_Assign && Opc <= BO_OrAssign; 2826 } 2827 bool isCompoundAssignmentOp() const { 2828 return isCompoundAssignmentOp(getOpcode()); 2829 } 2830 static Opcode getOpForCompoundAssignment(Opcode Opc) { 2831 assert(isCompoundAssignmentOp(Opc)); 2832 if (Opc >= BO_AndAssign) 2833 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 2834 else 2835 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 2836 } 2837 2838 static bool isShiftAssignOp(Opcode Opc) { 2839 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2840 } 2841 bool isShiftAssignOp() const { 2842 return isShiftAssignOp(getOpcode()); 2843 } 2844 2845 static bool classof(const Stmt *S) { 2846 return S->getStmtClass() >= firstBinaryOperatorConstant && 2847 S->getStmtClass() <= lastBinaryOperatorConstant; 2848 } 2849 static bool classof(const BinaryOperator *) { return true; } 2850 2851 // Iterators 2852 child_range children() { 2853 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2854 } 2855 2856protected: 2857 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2858 ExprValueKind VK, ExprObjectKind OK, 2859 SourceLocation opLoc, bool dead) 2860 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2861 lhs->isTypeDependent() || rhs->isTypeDependent(), 2862 lhs->isValueDependent() || rhs->isValueDependent(), 2863 (lhs->isInstantiationDependent() || 2864 rhs->isInstantiationDependent()), 2865 (lhs->containsUnexpandedParameterPack() || 2866 rhs->containsUnexpandedParameterPack())), 2867 Opc(opc), OpLoc(opLoc) { 2868 SubExprs[LHS] = lhs; 2869 SubExprs[RHS] = rhs; 2870 } 2871 2872 BinaryOperator(StmtClass SC, EmptyShell Empty) 2873 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2874}; 2875 2876/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2877/// track of the type the operation is performed in. Due to the semantics of 2878/// these operators, the operands are promoted, the arithmetic performed, an 2879/// implicit conversion back to the result type done, then the assignment takes 2880/// place. This captures the intermediate type which the computation is done 2881/// in. 2882class CompoundAssignOperator : public BinaryOperator { 2883 QualType ComputationLHSType; 2884 QualType ComputationResultType; 2885public: 2886 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2887 ExprValueKind VK, ExprObjectKind OK, 2888 QualType CompLHSType, QualType CompResultType, 2889 SourceLocation OpLoc) 2890 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2891 ComputationLHSType(CompLHSType), 2892 ComputationResultType(CompResultType) { 2893 assert(isCompoundAssignmentOp() && 2894 "Only should be used for compound assignments"); 2895 } 2896 2897 /// \brief Build an empty compound assignment operator expression. 2898 explicit CompoundAssignOperator(EmptyShell Empty) 2899 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2900 2901 // The two computation types are the type the LHS is converted 2902 // to for the computation and the type of the result; the two are 2903 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2904 QualType getComputationLHSType() const { return ComputationLHSType; } 2905 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2906 2907 QualType getComputationResultType() const { return ComputationResultType; } 2908 void setComputationResultType(QualType T) { ComputationResultType = T; } 2909 2910 static bool classof(const CompoundAssignOperator *) { return true; } 2911 static bool classof(const Stmt *S) { 2912 return S->getStmtClass() == CompoundAssignOperatorClass; 2913 } 2914}; 2915 2916/// AbstractConditionalOperator - An abstract base class for 2917/// ConditionalOperator and BinaryConditionalOperator. 2918class AbstractConditionalOperator : public Expr { 2919 SourceLocation QuestionLoc, ColonLoc; 2920 friend class ASTStmtReader; 2921 2922protected: 2923 AbstractConditionalOperator(StmtClass SC, QualType T, 2924 ExprValueKind VK, ExprObjectKind OK, 2925 bool TD, bool VD, bool ID, 2926 bool ContainsUnexpandedParameterPack, 2927 SourceLocation qloc, 2928 SourceLocation cloc) 2929 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 2930 QuestionLoc(qloc), ColonLoc(cloc) {} 2931 2932 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2933 : Expr(SC, Empty) { } 2934 2935public: 2936 // getCond - Return the expression representing the condition for 2937 // the ?: operator. 2938 Expr *getCond() const; 2939 2940 // getTrueExpr - Return the subexpression representing the value of 2941 // the expression if the condition evaluates to true. 2942 Expr *getTrueExpr() const; 2943 2944 // getFalseExpr - Return the subexpression representing the value of 2945 // the expression if the condition evaluates to false. This is 2946 // the same as getRHS. 2947 Expr *getFalseExpr() const; 2948 2949 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2950 SourceLocation getColonLoc() const { return ColonLoc; } 2951 2952 static bool classof(const Stmt *T) { 2953 return T->getStmtClass() == ConditionalOperatorClass || 2954 T->getStmtClass() == BinaryConditionalOperatorClass; 2955 } 2956 static bool classof(const AbstractConditionalOperator *) { return true; } 2957}; 2958 2959/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2960/// middle" extension is a BinaryConditionalOperator. 2961class ConditionalOperator : public AbstractConditionalOperator { 2962 enum { COND, LHS, RHS, END_EXPR }; 2963 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2964 2965 friend class ASTStmtReader; 2966public: 2967 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2968 SourceLocation CLoc, Expr *rhs, 2969 QualType t, ExprValueKind VK, ExprObjectKind OK) 2970 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 2971 // FIXME: the type of the conditional operator doesn't 2972 // depend on the type of the conditional, but the standard 2973 // seems to imply that it could. File a bug! 2974 (lhs->isTypeDependent() || rhs->isTypeDependent()), 2975 (cond->isValueDependent() || lhs->isValueDependent() || 2976 rhs->isValueDependent()), 2977 (cond->isInstantiationDependent() || 2978 lhs->isInstantiationDependent() || 2979 rhs->isInstantiationDependent()), 2980 (cond->containsUnexpandedParameterPack() || 2981 lhs->containsUnexpandedParameterPack() || 2982 rhs->containsUnexpandedParameterPack()), 2983 QLoc, CLoc) { 2984 SubExprs[COND] = cond; 2985 SubExprs[LHS] = lhs; 2986 SubExprs[RHS] = rhs; 2987 } 2988 2989 /// \brief Build an empty conditional operator. 2990 explicit ConditionalOperator(EmptyShell Empty) 2991 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 2992 2993 // getCond - Return the expression representing the condition for 2994 // the ?: operator. 2995 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2996 2997 // getTrueExpr - Return the subexpression representing the value of 2998 // the expression if the condition evaluates to true. 2999 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3000 3001 // getFalseExpr - Return the subexpression representing the value of 3002 // the expression if the condition evaluates to false. This is 3003 // the same as getRHS. 3004 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3005 3006 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3007 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3008 3009 SourceRange getSourceRange() const { 3010 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 3011 } 3012 static bool classof(const Stmt *T) { 3013 return T->getStmtClass() == ConditionalOperatorClass; 3014 } 3015 static bool classof(const ConditionalOperator *) { return true; } 3016 3017 // Iterators 3018 child_range children() { 3019 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3020 } 3021}; 3022 3023/// BinaryConditionalOperator - The GNU extension to the conditional 3024/// operator which allows the middle operand to be omitted. 3025/// 3026/// This is a different expression kind on the assumption that almost 3027/// every client ends up needing to know that these are different. 3028class BinaryConditionalOperator : public AbstractConditionalOperator { 3029 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3030 3031 /// - the common condition/left-hand-side expression, which will be 3032 /// evaluated as the opaque value 3033 /// - the condition, expressed in terms of the opaque value 3034 /// - the left-hand-side, expressed in terms of the opaque value 3035 /// - the right-hand-side 3036 Stmt *SubExprs[NUM_SUBEXPRS]; 3037 OpaqueValueExpr *OpaqueValue; 3038 3039 friend class ASTStmtReader; 3040public: 3041 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3042 Expr *cond, Expr *lhs, Expr *rhs, 3043 SourceLocation qloc, SourceLocation cloc, 3044 QualType t, ExprValueKind VK, ExprObjectKind OK) 3045 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3046 (common->isTypeDependent() || rhs->isTypeDependent()), 3047 (common->isValueDependent() || rhs->isValueDependent()), 3048 (common->isInstantiationDependent() || 3049 rhs->isInstantiationDependent()), 3050 (common->containsUnexpandedParameterPack() || 3051 rhs->containsUnexpandedParameterPack()), 3052 qloc, cloc), 3053 OpaqueValue(opaqueValue) { 3054 SubExprs[COMMON] = common; 3055 SubExprs[COND] = cond; 3056 SubExprs[LHS] = lhs; 3057 SubExprs[RHS] = rhs; 3058 3059 OpaqueValue->setSourceExpr(common); 3060 } 3061 3062 /// \brief Build an empty conditional operator. 3063 explicit BinaryConditionalOperator(EmptyShell Empty) 3064 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3065 3066 /// \brief getCommon - Return the common expression, written to the 3067 /// left of the condition. The opaque value will be bound to the 3068 /// result of this expression. 3069 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3070 3071 /// \brief getOpaqueValue - Return the opaque value placeholder. 3072 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3073 3074 /// \brief getCond - Return the condition expression; this is defined 3075 /// in terms of the opaque value. 3076 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3077 3078 /// \brief getTrueExpr - Return the subexpression which will be 3079 /// evaluated if the condition evaluates to true; this is defined 3080 /// in terms of the opaque value. 3081 Expr *getTrueExpr() const { 3082 return cast<Expr>(SubExprs[LHS]); 3083 } 3084 3085 /// \brief getFalseExpr - Return the subexpression which will be 3086 /// evaluated if the condnition evaluates to false; this is 3087 /// defined in terms of the opaque value. 3088 Expr *getFalseExpr() const { 3089 return cast<Expr>(SubExprs[RHS]); 3090 } 3091 3092 SourceRange getSourceRange() const { 3093 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 3094 } 3095 static bool classof(const Stmt *T) { 3096 return T->getStmtClass() == BinaryConditionalOperatorClass; 3097 } 3098 static bool classof(const BinaryConditionalOperator *) { return true; } 3099 3100 // Iterators 3101 child_range children() { 3102 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3103 } 3104}; 3105 3106inline Expr *AbstractConditionalOperator::getCond() const { 3107 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3108 return co->getCond(); 3109 return cast<BinaryConditionalOperator>(this)->getCond(); 3110} 3111 3112inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3113 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3114 return co->getTrueExpr(); 3115 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3116} 3117 3118inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3119 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3120 return co->getFalseExpr(); 3121 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3122} 3123 3124/// AddrLabelExpr - The GNU address of label extension, representing &&label. 3125class AddrLabelExpr : public Expr { 3126 SourceLocation AmpAmpLoc, LabelLoc; 3127 LabelDecl *Label; 3128public: 3129 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3130 QualType t) 3131 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3132 false), 3133 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3134 3135 /// \brief Build an empty address of a label expression. 3136 explicit AddrLabelExpr(EmptyShell Empty) 3137 : Expr(AddrLabelExprClass, Empty) { } 3138 3139 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3140 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3141 SourceLocation getLabelLoc() const { return LabelLoc; } 3142 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3143 3144 SourceRange getSourceRange() const { 3145 return SourceRange(AmpAmpLoc, LabelLoc); 3146 } 3147 3148 LabelDecl *getLabel() const { return Label; } 3149 void setLabel(LabelDecl *L) { Label = L; } 3150 3151 static bool classof(const Stmt *T) { 3152 return T->getStmtClass() == AddrLabelExprClass; 3153 } 3154 static bool classof(const AddrLabelExpr *) { return true; } 3155 3156 // Iterators 3157 child_range children() { return child_range(); } 3158}; 3159 3160/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3161/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3162/// takes the value of the last subexpression. 3163/// 3164/// A StmtExpr is always an r-value; values "returned" out of a 3165/// StmtExpr will be copied. 3166class StmtExpr : public Expr { 3167 Stmt *SubStmt; 3168 SourceLocation LParenLoc, RParenLoc; 3169public: 3170 // FIXME: Does type-dependence need to be computed differently? 3171 // FIXME: Do we need to compute instantiation instantiation-dependence for 3172 // statements? (ugh!) 3173 StmtExpr(CompoundStmt *substmt, QualType T, 3174 SourceLocation lp, SourceLocation rp) : 3175 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3176 T->isDependentType(), false, false, false), 3177 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3178 3179 /// \brief Build an empty statement expression. 3180 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3181 3182 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3183 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3184 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3185 3186 SourceRange getSourceRange() const { 3187 return SourceRange(LParenLoc, RParenLoc); 3188 } 3189 3190 SourceLocation getLParenLoc() const { return LParenLoc; } 3191 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3192 SourceLocation getRParenLoc() const { return RParenLoc; } 3193 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3194 3195 static bool classof(const Stmt *T) { 3196 return T->getStmtClass() == StmtExprClass; 3197 } 3198 static bool classof(const StmtExpr *) { return true; } 3199 3200 // Iterators 3201 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3202}; 3203 3204 3205/// ShuffleVectorExpr - clang-specific builtin-in function 3206/// __builtin_shufflevector. 3207/// This AST node represents a operator that does a constant 3208/// shuffle, similar to LLVM's shufflevector instruction. It takes 3209/// two vectors and a variable number of constant indices, 3210/// and returns the appropriately shuffled vector. 3211class ShuffleVectorExpr : public Expr { 3212 SourceLocation BuiltinLoc, RParenLoc; 3213 3214 // SubExprs - the list of values passed to the __builtin_shufflevector 3215 // function. The first two are vectors, and the rest are constant 3216 // indices. The number of values in this list is always 3217 // 2+the number of indices in the vector type. 3218 Stmt **SubExprs; 3219 unsigned NumExprs; 3220 3221public: 3222 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3223 QualType Type, SourceLocation BLoc, 3224 SourceLocation RP); 3225 3226 /// \brief Build an empty vector-shuffle expression. 3227 explicit ShuffleVectorExpr(EmptyShell Empty) 3228 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3229 3230 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3231 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3232 3233 SourceLocation getRParenLoc() const { return RParenLoc; } 3234 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3235 3236 SourceRange getSourceRange() const { 3237 return SourceRange(BuiltinLoc, RParenLoc); 3238 } 3239 static bool classof(const Stmt *T) { 3240 return T->getStmtClass() == ShuffleVectorExprClass; 3241 } 3242 static bool classof(const ShuffleVectorExpr *) { return true; } 3243 3244 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3245 /// constant expression, the actual arguments passed in, and the function 3246 /// pointers. 3247 unsigned getNumSubExprs() const { return NumExprs; } 3248 3249 /// \brief Retrieve the array of expressions. 3250 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3251 3252 /// getExpr - Return the Expr at the specified index. 3253 Expr *getExpr(unsigned Index) { 3254 assert((Index < NumExprs) && "Arg access out of range!"); 3255 return cast<Expr>(SubExprs[Index]); 3256 } 3257 const Expr *getExpr(unsigned Index) const { 3258 assert((Index < NumExprs) && "Arg access out of range!"); 3259 return cast<Expr>(SubExprs[Index]); 3260 } 3261 3262 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3263 3264 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3265 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3266 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3267 } 3268 3269 // Iterators 3270 child_range children() { 3271 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3272 } 3273}; 3274 3275/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3276/// This AST node is similar to the conditional operator (?:) in C, with 3277/// the following exceptions: 3278/// - the test expression must be a integer constant expression. 3279/// - the expression returned acts like the chosen subexpression in every 3280/// visible way: the type is the same as that of the chosen subexpression, 3281/// and all predicates (whether it's an l-value, whether it's an integer 3282/// constant expression, etc.) return the same result as for the chosen 3283/// sub-expression. 3284class ChooseExpr : public Expr { 3285 enum { COND, LHS, RHS, END_EXPR }; 3286 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3287 SourceLocation BuiltinLoc, RParenLoc; 3288public: 3289 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3290 QualType t, ExprValueKind VK, ExprObjectKind OK, 3291 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3292 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3293 (cond->isInstantiationDependent() || 3294 lhs->isInstantiationDependent() || 3295 rhs->isInstantiationDependent()), 3296 (cond->containsUnexpandedParameterPack() || 3297 lhs->containsUnexpandedParameterPack() || 3298 rhs->containsUnexpandedParameterPack())), 3299 BuiltinLoc(BLoc), RParenLoc(RP) { 3300 SubExprs[COND] = cond; 3301 SubExprs[LHS] = lhs; 3302 SubExprs[RHS] = rhs; 3303 } 3304 3305 /// \brief Build an empty __builtin_choose_expr. 3306 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3307 3308 /// isConditionTrue - Return whether the condition is true (i.e. not 3309 /// equal to zero). 3310 bool isConditionTrue(const ASTContext &C) const; 3311 3312 /// getChosenSubExpr - Return the subexpression chosen according to the 3313 /// condition. 3314 Expr *getChosenSubExpr(const ASTContext &C) const { 3315 return isConditionTrue(C) ? getLHS() : getRHS(); 3316 } 3317 3318 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3319 void setCond(Expr *E) { SubExprs[COND] = E; } 3320 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3321 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3322 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3323 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3324 3325 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3326 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3327 3328 SourceLocation getRParenLoc() const { return RParenLoc; } 3329 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3330 3331 SourceRange getSourceRange() const { 3332 return SourceRange(BuiltinLoc, RParenLoc); 3333 } 3334 static bool classof(const Stmt *T) { 3335 return T->getStmtClass() == ChooseExprClass; 3336 } 3337 static bool classof(const ChooseExpr *) { return true; } 3338 3339 // Iterators 3340 child_range children() { 3341 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3342 } 3343}; 3344 3345/// GNUNullExpr - Implements the GNU __null extension, which is a name 3346/// for a null pointer constant that has integral type (e.g., int or 3347/// long) and is the same size and alignment as a pointer. The __null 3348/// extension is typically only used by system headers, which define 3349/// NULL as __null in C++ rather than using 0 (which is an integer 3350/// that may not match the size of a pointer). 3351class GNUNullExpr : public Expr { 3352 /// TokenLoc - The location of the __null keyword. 3353 SourceLocation TokenLoc; 3354 3355public: 3356 GNUNullExpr(QualType Ty, SourceLocation Loc) 3357 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3358 false), 3359 TokenLoc(Loc) { } 3360 3361 /// \brief Build an empty GNU __null expression. 3362 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3363 3364 /// getTokenLocation - The location of the __null token. 3365 SourceLocation getTokenLocation() const { return TokenLoc; } 3366 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3367 3368 SourceRange getSourceRange() const { 3369 return SourceRange(TokenLoc); 3370 } 3371 static bool classof(const Stmt *T) { 3372 return T->getStmtClass() == GNUNullExprClass; 3373 } 3374 static bool classof(const GNUNullExpr *) { return true; } 3375 3376 // Iterators 3377 child_range children() { return child_range(); } 3378}; 3379 3380/// VAArgExpr, used for the builtin function __builtin_va_arg. 3381class VAArgExpr : public Expr { 3382 Stmt *Val; 3383 TypeSourceInfo *TInfo; 3384 SourceLocation BuiltinLoc, RParenLoc; 3385public: 3386 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3387 SourceLocation RPLoc, QualType t) 3388 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3389 t->isDependentType(), false, 3390 (TInfo->getType()->isInstantiationDependentType() || 3391 e->isInstantiationDependent()), 3392 (TInfo->getType()->containsUnexpandedParameterPack() || 3393 e->containsUnexpandedParameterPack())), 3394 Val(e), TInfo(TInfo), 3395 BuiltinLoc(BLoc), 3396 RParenLoc(RPLoc) { } 3397 3398 /// \brief Create an empty __builtin_va_arg expression. 3399 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3400 3401 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3402 Expr *getSubExpr() { return cast<Expr>(Val); } 3403 void setSubExpr(Expr *E) { Val = E; } 3404 3405 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3406 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3407 3408 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3409 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3410 3411 SourceLocation getRParenLoc() const { return RParenLoc; } 3412 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3413 3414 SourceRange getSourceRange() const { 3415 return SourceRange(BuiltinLoc, RParenLoc); 3416 } 3417 static bool classof(const Stmt *T) { 3418 return T->getStmtClass() == VAArgExprClass; 3419 } 3420 static bool classof(const VAArgExpr *) { return true; } 3421 3422 // Iterators 3423 child_range children() { return child_range(&Val, &Val+1); } 3424}; 3425 3426/// @brief Describes an C or C++ initializer list. 3427/// 3428/// InitListExpr describes an initializer list, which can be used to 3429/// initialize objects of different types, including 3430/// struct/class/union types, arrays, and vectors. For example: 3431/// 3432/// @code 3433/// struct foo x = { 1, { 2, 3 } }; 3434/// @endcode 3435/// 3436/// Prior to semantic analysis, an initializer list will represent the 3437/// initializer list as written by the user, but will have the 3438/// placeholder type "void". This initializer list is called the 3439/// syntactic form of the initializer, and may contain C99 designated 3440/// initializers (represented as DesignatedInitExprs), initializations 3441/// of subobject members without explicit braces, and so on. Clients 3442/// interested in the original syntax of the initializer list should 3443/// use the syntactic form of the initializer list. 3444/// 3445/// After semantic analysis, the initializer list will represent the 3446/// semantic form of the initializer, where the initializations of all 3447/// subobjects are made explicit with nested InitListExpr nodes and 3448/// C99 designators have been eliminated by placing the designated 3449/// initializations into the subobject they initialize. Additionally, 3450/// any "holes" in the initialization, where no initializer has been 3451/// specified for a particular subobject, will be replaced with 3452/// implicitly-generated ImplicitValueInitExpr expressions that 3453/// value-initialize the subobjects. Note, however, that the 3454/// initializer lists may still have fewer initializers than there are 3455/// elements to initialize within the object. 3456/// 3457/// Given the semantic form of the initializer list, one can retrieve 3458/// the original syntactic form of that initializer list (if it 3459/// exists) using getSyntacticForm(). Since many initializer lists 3460/// have the same syntactic and semantic forms, getSyntacticForm() may 3461/// return NULL, indicating that the current initializer list also 3462/// serves as its syntactic form. 3463class InitListExpr : public Expr { 3464 // FIXME: Eliminate this vector in favor of ASTContext allocation 3465 typedef ASTVector<Stmt *> InitExprsTy; 3466 InitExprsTy InitExprs; 3467 SourceLocation LBraceLoc, RBraceLoc; 3468 3469 /// Contains the initializer list that describes the syntactic form 3470 /// written in the source code. 3471 InitListExpr *SyntacticForm; 3472 3473 /// \brief Either: 3474 /// If this initializer list initializes an array with more elements than 3475 /// there are initializers in the list, specifies an expression to be used 3476 /// for value initialization of the rest of the elements. 3477 /// Or 3478 /// If this initializer list initializes a union, specifies which 3479 /// field within the union will be initialized. 3480 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3481 3482 /// Whether this initializer list originally had a GNU array-range 3483 /// designator in it. This is a temporary marker used by CodeGen. 3484 bool HadArrayRangeDesignator; 3485 3486public: 3487 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3488 Expr **initexprs, unsigned numinits, 3489 SourceLocation rbraceloc); 3490 3491 /// \brief Build an empty initializer list. 3492 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3493 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3494 3495 unsigned getNumInits() const { return InitExprs.size(); } 3496 3497 /// \brief Retrieve the set of initializers. 3498 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3499 3500 const Expr *getInit(unsigned Init) const { 3501 assert(Init < getNumInits() && "Initializer access out of range!"); 3502 return cast_or_null<Expr>(InitExprs[Init]); 3503 } 3504 3505 Expr *getInit(unsigned Init) { 3506 assert(Init < getNumInits() && "Initializer access out of range!"); 3507 return cast_or_null<Expr>(InitExprs[Init]); 3508 } 3509 3510 void setInit(unsigned Init, Expr *expr) { 3511 assert(Init < getNumInits() && "Initializer access out of range!"); 3512 InitExprs[Init] = expr; 3513 } 3514 3515 /// \brief Reserve space for some number of initializers. 3516 void reserveInits(ASTContext &C, unsigned NumInits); 3517 3518 /// @brief Specify the number of initializers 3519 /// 3520 /// If there are more than @p NumInits initializers, the remaining 3521 /// initializers will be destroyed. If there are fewer than @p 3522 /// NumInits initializers, NULL expressions will be added for the 3523 /// unknown initializers. 3524 void resizeInits(ASTContext &Context, unsigned NumInits); 3525 3526 /// @brief Updates the initializer at index @p Init with the new 3527 /// expression @p expr, and returns the old expression at that 3528 /// location. 3529 /// 3530 /// When @p Init is out of range for this initializer list, the 3531 /// initializer list will be extended with NULL expressions to 3532 /// accommodate the new entry. 3533 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3534 3535 /// \brief If this initializer list initializes an array with more elements 3536 /// than there are initializers in the list, specifies an expression to be 3537 /// used for value initialization of the rest of the elements. 3538 Expr *getArrayFiller() { 3539 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3540 } 3541 const Expr *getArrayFiller() const { 3542 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3543 } 3544 void setArrayFiller(Expr *filler); 3545 3546 /// \brief Return true if this is an array initializer and its array "filler" 3547 /// has been set. 3548 bool hasArrayFiller() const { return getArrayFiller(); } 3549 3550 /// \brief If this initializes a union, specifies which field in the 3551 /// union to initialize. 3552 /// 3553 /// Typically, this field is the first named field within the 3554 /// union. However, a designated initializer can specify the 3555 /// initialization of a different field within the union. 3556 FieldDecl *getInitializedFieldInUnion() { 3557 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3558 } 3559 const FieldDecl *getInitializedFieldInUnion() const { 3560 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3561 } 3562 void setInitializedFieldInUnion(FieldDecl *FD) { 3563 ArrayFillerOrUnionFieldInit = FD; 3564 } 3565 3566 // Explicit InitListExpr's originate from source code (and have valid source 3567 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3568 bool isExplicit() { 3569 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3570 } 3571 3572 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3573 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3574 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3575 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3576 3577 /// @brief Retrieve the initializer list that describes the 3578 /// syntactic form of the initializer. 3579 /// 3580 /// 3581 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3582 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3583 3584 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3585 void sawArrayRangeDesignator(bool ARD = true) { 3586 HadArrayRangeDesignator = ARD; 3587 } 3588 3589 SourceRange getSourceRange() const; 3590 3591 static bool classof(const Stmt *T) { 3592 return T->getStmtClass() == InitListExprClass; 3593 } 3594 static bool classof(const InitListExpr *) { return true; } 3595 3596 // Iterators 3597 child_range children() { 3598 if (InitExprs.empty()) return child_range(); 3599 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3600 } 3601 3602 typedef InitExprsTy::iterator iterator; 3603 typedef InitExprsTy::const_iterator const_iterator; 3604 typedef InitExprsTy::reverse_iterator reverse_iterator; 3605 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3606 3607 iterator begin() { return InitExprs.begin(); } 3608 const_iterator begin() const { return InitExprs.begin(); } 3609 iterator end() { return InitExprs.end(); } 3610 const_iterator end() const { return InitExprs.end(); } 3611 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3612 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3613 reverse_iterator rend() { return InitExprs.rend(); } 3614 const_reverse_iterator rend() const { return InitExprs.rend(); } 3615 3616 friend class ASTStmtReader; 3617 friend class ASTStmtWriter; 3618}; 3619 3620/// @brief Represents a C99 designated initializer expression. 3621/// 3622/// A designated initializer expression (C99 6.7.8) contains one or 3623/// more designators (which can be field designators, array 3624/// designators, or GNU array-range designators) followed by an 3625/// expression that initializes the field or element(s) that the 3626/// designators refer to. For example, given: 3627/// 3628/// @code 3629/// struct point { 3630/// double x; 3631/// double y; 3632/// }; 3633/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3634/// @endcode 3635/// 3636/// The InitListExpr contains three DesignatedInitExprs, the first of 3637/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3638/// designators, one array designator for @c [2] followed by one field 3639/// designator for @c .y. The initalization expression will be 1.0. 3640class DesignatedInitExpr : public Expr { 3641public: 3642 /// \brief Forward declaration of the Designator class. 3643 class Designator; 3644 3645private: 3646 /// The location of the '=' or ':' prior to the actual initializer 3647 /// expression. 3648 SourceLocation EqualOrColonLoc; 3649 3650 /// Whether this designated initializer used the GNU deprecated 3651 /// syntax rather than the C99 '=' syntax. 3652 bool GNUSyntax : 1; 3653 3654 /// The number of designators in this initializer expression. 3655 unsigned NumDesignators : 15; 3656 3657 /// \brief The designators in this designated initialization 3658 /// expression. 3659 Designator *Designators; 3660 3661 /// The number of subexpressions of this initializer expression, 3662 /// which contains both the initializer and any additional 3663 /// expressions used by array and array-range designators. 3664 unsigned NumSubExprs : 16; 3665 3666 3667 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3668 const Designator *Designators, 3669 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3670 Expr **IndexExprs, unsigned NumIndexExprs, 3671 Expr *Init); 3672 3673 explicit DesignatedInitExpr(unsigned NumSubExprs) 3674 : Expr(DesignatedInitExprClass, EmptyShell()), 3675 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3676 3677public: 3678 /// A field designator, e.g., ".x". 3679 struct FieldDesignator { 3680 /// Refers to the field that is being initialized. The low bit 3681 /// of this field determines whether this is actually a pointer 3682 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3683 /// initially constructed, a field designator will store an 3684 /// IdentifierInfo*. After semantic analysis has resolved that 3685 /// name, the field designator will instead store a FieldDecl*. 3686 uintptr_t NameOrField; 3687 3688 /// The location of the '.' in the designated initializer. 3689 unsigned DotLoc; 3690 3691 /// The location of the field name in the designated initializer. 3692 unsigned FieldLoc; 3693 }; 3694 3695 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3696 struct ArrayOrRangeDesignator { 3697 /// Location of the first index expression within the designated 3698 /// initializer expression's list of subexpressions. 3699 unsigned Index; 3700 /// The location of the '[' starting the array range designator. 3701 unsigned LBracketLoc; 3702 /// The location of the ellipsis separating the start and end 3703 /// indices. Only valid for GNU array-range designators. 3704 unsigned EllipsisLoc; 3705 /// The location of the ']' terminating the array range designator. 3706 unsigned RBracketLoc; 3707 }; 3708 3709 /// @brief Represents a single C99 designator. 3710 /// 3711 /// @todo This class is infuriatingly similar to clang::Designator, 3712 /// but minor differences (storing indices vs. storing pointers) 3713 /// keep us from reusing it. Try harder, later, to rectify these 3714 /// differences. 3715 class Designator { 3716 /// @brief The kind of designator this describes. 3717 enum { 3718 FieldDesignator, 3719 ArrayDesignator, 3720 ArrayRangeDesignator 3721 } Kind; 3722 3723 union { 3724 /// A field designator, e.g., ".x". 3725 struct FieldDesignator Field; 3726 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3727 struct ArrayOrRangeDesignator ArrayOrRange; 3728 }; 3729 friend class DesignatedInitExpr; 3730 3731 public: 3732 Designator() {} 3733 3734 /// @brief Initializes a field designator. 3735 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3736 SourceLocation FieldLoc) 3737 : Kind(FieldDesignator) { 3738 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3739 Field.DotLoc = DotLoc.getRawEncoding(); 3740 Field.FieldLoc = FieldLoc.getRawEncoding(); 3741 } 3742 3743 /// @brief Initializes an array designator. 3744 Designator(unsigned Index, SourceLocation LBracketLoc, 3745 SourceLocation RBracketLoc) 3746 : Kind(ArrayDesignator) { 3747 ArrayOrRange.Index = Index; 3748 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3749 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3750 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3751 } 3752 3753 /// @brief Initializes a GNU array-range designator. 3754 Designator(unsigned Index, SourceLocation LBracketLoc, 3755 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3756 : Kind(ArrayRangeDesignator) { 3757 ArrayOrRange.Index = Index; 3758 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3759 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3760 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3761 } 3762 3763 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3764 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3765 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3766 3767 IdentifierInfo *getFieldName() const; 3768 3769 FieldDecl *getField() const { 3770 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3771 if (Field.NameOrField & 0x01) 3772 return 0; 3773 else 3774 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3775 } 3776 3777 void setField(FieldDecl *FD) { 3778 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3779 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3780 } 3781 3782 SourceLocation getDotLoc() const { 3783 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3784 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3785 } 3786 3787 SourceLocation getFieldLoc() const { 3788 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3789 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3790 } 3791 3792 SourceLocation getLBracketLoc() const { 3793 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3794 "Only valid on an array or array-range designator"); 3795 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3796 } 3797 3798 SourceLocation getRBracketLoc() const { 3799 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3800 "Only valid on an array or array-range designator"); 3801 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3802 } 3803 3804 SourceLocation getEllipsisLoc() const { 3805 assert(Kind == ArrayRangeDesignator && 3806 "Only valid on an array-range designator"); 3807 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3808 } 3809 3810 unsigned getFirstExprIndex() const { 3811 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3812 "Only valid on an array or array-range designator"); 3813 return ArrayOrRange.Index; 3814 } 3815 3816 SourceLocation getStartLocation() const { 3817 if (Kind == FieldDesignator) 3818 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3819 else 3820 return getLBracketLoc(); 3821 } 3822 SourceLocation getEndLocation() const { 3823 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3824 } 3825 SourceRange getSourceRange() const { 3826 return SourceRange(getStartLocation(), getEndLocation()); 3827 } 3828 }; 3829 3830 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3831 unsigned NumDesignators, 3832 Expr **IndexExprs, unsigned NumIndexExprs, 3833 SourceLocation EqualOrColonLoc, 3834 bool GNUSyntax, Expr *Init); 3835 3836 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3837 3838 /// @brief Returns the number of designators in this initializer. 3839 unsigned size() const { return NumDesignators; } 3840 3841 // Iterator access to the designators. 3842 typedef Designator *designators_iterator; 3843 designators_iterator designators_begin() { return Designators; } 3844 designators_iterator designators_end() { 3845 return Designators + NumDesignators; 3846 } 3847 3848 typedef const Designator *const_designators_iterator; 3849 const_designators_iterator designators_begin() const { return Designators; } 3850 const_designators_iterator designators_end() const { 3851 return Designators + NumDesignators; 3852 } 3853 3854 typedef std::reverse_iterator<designators_iterator> 3855 reverse_designators_iterator; 3856 reverse_designators_iterator designators_rbegin() { 3857 return reverse_designators_iterator(designators_end()); 3858 } 3859 reverse_designators_iterator designators_rend() { 3860 return reverse_designators_iterator(designators_begin()); 3861 } 3862 3863 typedef std::reverse_iterator<const_designators_iterator> 3864 const_reverse_designators_iterator; 3865 const_reverse_designators_iterator designators_rbegin() const { 3866 return const_reverse_designators_iterator(designators_end()); 3867 } 3868 const_reverse_designators_iterator designators_rend() const { 3869 return const_reverse_designators_iterator(designators_begin()); 3870 } 3871 3872 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3873 3874 void setDesignators(ASTContext &C, const Designator *Desigs, 3875 unsigned NumDesigs); 3876 3877 Expr *getArrayIndex(const Designator& D); 3878 Expr *getArrayRangeStart(const Designator& D); 3879 Expr *getArrayRangeEnd(const Designator& D); 3880 3881 /// @brief Retrieve the location of the '=' that precedes the 3882 /// initializer value itself, if present. 3883 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3884 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3885 3886 /// @brief Determines whether this designated initializer used the 3887 /// deprecated GNU syntax for designated initializers. 3888 bool usesGNUSyntax() const { return GNUSyntax; } 3889 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3890 3891 /// @brief Retrieve the initializer value. 3892 Expr *getInit() const { 3893 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3894 } 3895 3896 void setInit(Expr *init) { 3897 *child_begin() = init; 3898 } 3899 3900 /// \brief Retrieve the total number of subexpressions in this 3901 /// designated initializer expression, including the actual 3902 /// initialized value and any expressions that occur within array 3903 /// and array-range designators. 3904 unsigned getNumSubExprs() const { return NumSubExprs; } 3905 3906 Expr *getSubExpr(unsigned Idx) { 3907 assert(Idx < NumSubExprs && "Subscript out of range"); 3908 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3909 Ptr += sizeof(DesignatedInitExpr); 3910 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3911 } 3912 3913 void setSubExpr(unsigned Idx, Expr *E) { 3914 assert(Idx < NumSubExprs && "Subscript out of range"); 3915 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3916 Ptr += sizeof(DesignatedInitExpr); 3917 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3918 } 3919 3920 /// \brief Replaces the designator at index @p Idx with the series 3921 /// of designators in [First, Last). 3922 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3923 const Designator *Last); 3924 3925 SourceRange getDesignatorsSourceRange() const; 3926 3927 SourceRange getSourceRange() const; 3928 3929 static bool classof(const Stmt *T) { 3930 return T->getStmtClass() == DesignatedInitExprClass; 3931 } 3932 static bool classof(const DesignatedInitExpr *) { return true; } 3933 3934 // Iterators 3935 child_range children() { 3936 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3937 return child_range(begin, begin + NumSubExprs); 3938 } 3939}; 3940 3941/// \brief Represents an implicitly-generated value initialization of 3942/// an object of a given type. 3943/// 3944/// Implicit value initializations occur within semantic initializer 3945/// list expressions (InitListExpr) as placeholders for subobject 3946/// initializations not explicitly specified by the user. 3947/// 3948/// \see InitListExpr 3949class ImplicitValueInitExpr : public Expr { 3950public: 3951 explicit ImplicitValueInitExpr(QualType ty) 3952 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3953 false, false, ty->isInstantiationDependentType(), false) { } 3954 3955 /// \brief Construct an empty implicit value initialization. 3956 explicit ImplicitValueInitExpr(EmptyShell Empty) 3957 : Expr(ImplicitValueInitExprClass, Empty) { } 3958 3959 static bool classof(const Stmt *T) { 3960 return T->getStmtClass() == ImplicitValueInitExprClass; 3961 } 3962 static bool classof(const ImplicitValueInitExpr *) { return true; } 3963 3964 SourceRange getSourceRange() const { 3965 return SourceRange(); 3966 } 3967 3968 // Iterators 3969 child_range children() { return child_range(); } 3970}; 3971 3972 3973class ParenListExpr : public Expr { 3974 Stmt **Exprs; 3975 unsigned NumExprs; 3976 SourceLocation LParenLoc, RParenLoc; 3977 3978public: 3979 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3980 unsigned numexprs, SourceLocation rparenloc, QualType T); 3981 3982 /// \brief Build an empty paren list. 3983 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3984 3985 unsigned getNumExprs() const { return NumExprs; } 3986 3987 const Expr* getExpr(unsigned Init) const { 3988 assert(Init < getNumExprs() && "Initializer access out of range!"); 3989 return cast_or_null<Expr>(Exprs[Init]); 3990 } 3991 3992 Expr* getExpr(unsigned Init) { 3993 assert(Init < getNumExprs() && "Initializer access out of range!"); 3994 return cast_or_null<Expr>(Exprs[Init]); 3995 } 3996 3997 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3998 3999 SourceLocation getLParenLoc() const { return LParenLoc; } 4000 SourceLocation getRParenLoc() const { return RParenLoc; } 4001 4002 SourceRange getSourceRange() const { 4003 return SourceRange(LParenLoc, RParenLoc); 4004 } 4005 static bool classof(const Stmt *T) { 4006 return T->getStmtClass() == ParenListExprClass; 4007 } 4008 static bool classof(const ParenListExpr *) { return true; } 4009 4010 // Iterators 4011 child_range children() { 4012 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4013 } 4014 4015 friend class ASTStmtReader; 4016 friend class ASTStmtWriter; 4017}; 4018 4019 4020/// \brief Represents a C11 generic selection. 4021/// 4022/// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4023/// expression, followed by one or more generic associations. Each generic 4024/// association specifies a type name and an expression, or "default" and an 4025/// expression (in which case it is known as a default generic association). 4026/// The type and value of the generic selection are identical to those of its 4027/// result expression, which is defined as the expression in the generic 4028/// association with a type name that is compatible with the type of the 4029/// controlling expression, or the expression in the default generic association 4030/// if no types are compatible. For example: 4031/// 4032/// @code 4033/// _Generic(X, double: 1, float: 2, default: 3) 4034/// @endcode 4035/// 4036/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4037/// or 3 if "hello". 4038/// 4039/// As an extension, generic selections are allowed in C++, where the following 4040/// additional semantics apply: 4041/// 4042/// Any generic selection whose controlling expression is type-dependent or 4043/// which names a dependent type in its association list is result-dependent, 4044/// which means that the choice of result expression is dependent. 4045/// Result-dependent generic associations are both type- and value-dependent. 4046class GenericSelectionExpr : public Expr { 4047 enum { CONTROLLING, END_EXPR }; 4048 TypeSourceInfo **AssocTypes; 4049 Stmt **SubExprs; 4050 unsigned NumAssocs, ResultIndex; 4051 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4052 4053public: 4054 GenericSelectionExpr(ASTContext &Context, 4055 SourceLocation GenericLoc, Expr *ControllingExpr, 4056 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4057 unsigned NumAssocs, SourceLocation DefaultLoc, 4058 SourceLocation RParenLoc, 4059 bool ContainsUnexpandedParameterPack, 4060 unsigned ResultIndex); 4061 4062 /// This constructor is used in the result-dependent case. 4063 GenericSelectionExpr(ASTContext &Context, 4064 SourceLocation GenericLoc, Expr *ControllingExpr, 4065 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4066 unsigned NumAssocs, SourceLocation DefaultLoc, 4067 SourceLocation RParenLoc, 4068 bool ContainsUnexpandedParameterPack); 4069 4070 explicit GenericSelectionExpr(EmptyShell Empty) 4071 : Expr(GenericSelectionExprClass, Empty) { } 4072 4073 unsigned getNumAssocs() const { return NumAssocs; } 4074 4075 SourceLocation getGenericLoc() const { return GenericLoc; } 4076 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4077 SourceLocation getRParenLoc() const { return RParenLoc; } 4078 4079 const Expr *getAssocExpr(unsigned i) const { 4080 return cast<Expr>(SubExprs[END_EXPR+i]); 4081 } 4082 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4083 4084 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4085 return AssocTypes[i]; 4086 } 4087 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4088 4089 QualType getAssocType(unsigned i) const { 4090 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4091 return TS->getType(); 4092 else 4093 return QualType(); 4094 } 4095 4096 const Expr *getControllingExpr() const { 4097 return cast<Expr>(SubExprs[CONTROLLING]); 4098 } 4099 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4100 4101 /// Whether this generic selection is result-dependent. 4102 bool isResultDependent() const { return ResultIndex == -1U; } 4103 4104 /// The zero-based index of the result expression's generic association in 4105 /// the generic selection's association list. Defined only if the 4106 /// generic selection is not result-dependent. 4107 unsigned getResultIndex() const { 4108 assert(!isResultDependent() && "Generic selection is result-dependent"); 4109 return ResultIndex; 4110 } 4111 4112 /// The generic selection's result expression. Defined only if the 4113 /// generic selection is not result-dependent. 4114 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4115 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4116 4117 SourceRange getSourceRange() const { 4118 return SourceRange(GenericLoc, RParenLoc); 4119 } 4120 static bool classof(const Stmt *T) { 4121 return T->getStmtClass() == GenericSelectionExprClass; 4122 } 4123 static bool classof(const GenericSelectionExpr *) { return true; } 4124 4125 child_range children() { 4126 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4127 } 4128 4129 friend class ASTStmtReader; 4130}; 4131 4132//===----------------------------------------------------------------------===// 4133// Clang Extensions 4134//===----------------------------------------------------------------------===// 4135 4136 4137/// ExtVectorElementExpr - This represents access to specific elements of a 4138/// vector, and may occur on the left hand side or right hand side. For example 4139/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4140/// 4141/// Note that the base may have either vector or pointer to vector type, just 4142/// like a struct field reference. 4143/// 4144class ExtVectorElementExpr : public Expr { 4145 Stmt *Base; 4146 IdentifierInfo *Accessor; 4147 SourceLocation AccessorLoc; 4148public: 4149 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4150 IdentifierInfo &accessor, SourceLocation loc) 4151 : Expr(ExtVectorElementExprClass, ty, VK, 4152 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4153 base->isTypeDependent(), base->isValueDependent(), 4154 base->isInstantiationDependent(), 4155 base->containsUnexpandedParameterPack()), 4156 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4157 4158 /// \brief Build an empty vector element expression. 4159 explicit ExtVectorElementExpr(EmptyShell Empty) 4160 : Expr(ExtVectorElementExprClass, Empty) { } 4161 4162 const Expr *getBase() const { return cast<Expr>(Base); } 4163 Expr *getBase() { return cast<Expr>(Base); } 4164 void setBase(Expr *E) { Base = E; } 4165 4166 IdentifierInfo &getAccessor() const { return *Accessor; } 4167 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4168 4169 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4170 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4171 4172 /// getNumElements - Get the number of components being selected. 4173 unsigned getNumElements() const; 4174 4175 /// containsDuplicateElements - Return true if any element access is 4176 /// repeated. 4177 bool containsDuplicateElements() const; 4178 4179 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4180 /// aggregate Constant of ConstantInt(s). 4181 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4182 4183 SourceRange getSourceRange() const { 4184 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4185 } 4186 4187 /// isArrow - Return true if the base expression is a pointer to vector, 4188 /// return false if the base expression is a vector. 4189 bool isArrow() const; 4190 4191 static bool classof(const Stmt *T) { 4192 return T->getStmtClass() == ExtVectorElementExprClass; 4193 } 4194 static bool classof(const ExtVectorElementExpr *) { return true; } 4195 4196 // Iterators 4197 child_range children() { return child_range(&Base, &Base+1); } 4198}; 4199 4200 4201/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4202/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4203class BlockExpr : public Expr { 4204protected: 4205 BlockDecl *TheBlock; 4206public: 4207 BlockExpr(BlockDecl *BD, QualType ty) 4208 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4209 ty->isDependentType(), false, 4210 // FIXME: Check for instantiate-dependence in the statement? 4211 ty->isInstantiationDependentType(), 4212 false), 4213 TheBlock(BD) {} 4214 4215 /// \brief Build an empty block expression. 4216 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4217 4218 const BlockDecl *getBlockDecl() const { return TheBlock; } 4219 BlockDecl *getBlockDecl() { return TheBlock; } 4220 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4221 4222 // Convenience functions for probing the underlying BlockDecl. 4223 SourceLocation getCaretLocation() const; 4224 const Stmt *getBody() const; 4225 Stmt *getBody(); 4226 4227 SourceRange getSourceRange() const { 4228 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4229 } 4230 4231 /// getFunctionType - Return the underlying function type for this block. 4232 const FunctionType *getFunctionType() const; 4233 4234 static bool classof(const Stmt *T) { 4235 return T->getStmtClass() == BlockExprClass; 4236 } 4237 static bool classof(const BlockExpr *) { return true; } 4238 4239 // Iterators 4240 child_range children() { return child_range(); } 4241}; 4242 4243/// BlockDeclRefExpr - A reference to a local variable declared in an 4244/// enclosing scope. 4245class BlockDeclRefExpr : public Expr { 4246 VarDecl *D; 4247 SourceLocation Loc; 4248 bool IsByRef : 1; 4249 bool ConstQualAdded : 1; 4250public: 4251 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 4252 SourceLocation l, bool ByRef, bool constAdded = false); 4253 4254 // \brief Build an empty reference to a declared variable in a 4255 // block. 4256 explicit BlockDeclRefExpr(EmptyShell Empty) 4257 : Expr(BlockDeclRefExprClass, Empty) { } 4258 4259 VarDecl *getDecl() { return D; } 4260 const VarDecl *getDecl() const { return D; } 4261 void setDecl(VarDecl *VD) { D = VD; } 4262 4263 SourceLocation getLocation() const { return Loc; } 4264 void setLocation(SourceLocation L) { Loc = L; } 4265 4266 SourceRange getSourceRange() const { return SourceRange(Loc); } 4267 4268 bool isByRef() const { return IsByRef; } 4269 void setByRef(bool BR) { IsByRef = BR; } 4270 4271 bool isConstQualAdded() const { return ConstQualAdded; } 4272 void setConstQualAdded(bool C) { ConstQualAdded = C; } 4273 4274 static bool classof(const Stmt *T) { 4275 return T->getStmtClass() == BlockDeclRefExprClass; 4276 } 4277 static bool classof(const BlockDeclRefExpr *) { return true; } 4278 4279 // Iterators 4280 child_range children() { return child_range(); } 4281}; 4282 4283/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4284/// This AST node provides support for reinterpreting a type to another 4285/// type of the same size. 4286class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4287private: 4288 Stmt *SrcExpr; 4289 SourceLocation BuiltinLoc, RParenLoc; 4290 4291 friend class ASTReader; 4292 friend class ASTStmtReader; 4293 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4294 4295public: 4296 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4297 ExprValueKind VK, ExprObjectKind OK, 4298 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4299 : Expr(AsTypeExprClass, DstType, VK, OK, 4300 DstType->isDependentType(), 4301 DstType->isDependentType() || SrcExpr->isValueDependent(), 4302 (DstType->isInstantiationDependentType() || 4303 SrcExpr->isInstantiationDependent()), 4304 (DstType->containsUnexpandedParameterPack() || 4305 SrcExpr->containsUnexpandedParameterPack())), 4306 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4307 4308 /// getSrcExpr - Return the Expr to be converted. 4309 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4310 4311 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4312 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4313 4314 /// getRParenLoc - Return the location of final right parenthesis. 4315 SourceLocation getRParenLoc() const { return RParenLoc; } 4316 4317 SourceRange getSourceRange() const { 4318 return SourceRange(BuiltinLoc, RParenLoc); 4319 } 4320 4321 static bool classof(const Stmt *T) { 4322 return T->getStmtClass() == AsTypeExprClass; 4323 } 4324 static bool classof(const AsTypeExpr *) { return true; } 4325 4326 // Iterators 4327 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4328}; 4329 4330/// PseudoObjectExpr - An expression which accesses a pseudo-object 4331/// l-value. A pseudo-object is an abstract object, accesses to which 4332/// are translated to calls. The pseudo-object expression has a 4333/// syntactic form, which shows how the expression was actually 4334/// written in the source code, and a semantic form, which is a series 4335/// of expressions to be executed in order which detail how the 4336/// operation is actually evaluated. Optionally, one of the semantic 4337/// forms may also provide a result value for the expression. 4338/// 4339/// If any of the semantic-form expressions is an OpaqueValueExpr, 4340/// that OVE is required to have a source expression, and it is bound 4341/// to the result of that source expression. Such OVEs may appear 4342/// only in subsequent semantic-form expressions and as 4343/// sub-expressions of the syntactic form. 4344/// 4345/// PseudoObjectExpr should be used only when an operation can be 4346/// usefully described in terms of fairly simple rewrite rules on 4347/// objects and functions that are meant to be used by end-developers. 4348/// For example, under the Itanium ABI, dynamic casts are implemented 4349/// as a call to a runtime function called __dynamic_cast; using this 4350/// class to describe that would be inappropriate because that call is 4351/// not really part of the user-visible semantics, and instead the 4352/// cast is properly reflected in the AST and IR-generation has been 4353/// taught to generate the call as necessary. In contrast, an 4354/// Objective-C property access is semantically defined to be 4355/// equivalent to a particular message send, and this is very much 4356/// part of the user model. The name of this class encourages this 4357/// modelling design. 4358class PseudoObjectExpr : public Expr { 4359 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4360 // Always at least two, because the first sub-expression is the 4361 // syntactic form. 4362 4363 // PseudoObjectExprBits.ResultIndex - The index of the 4364 // sub-expression holding the result. 0 means the result is void, 4365 // which is unambiguous because it's the index of the syntactic 4366 // form. Note that this is therefore 1 higher than the value passed 4367 // in to Create, which is an index within the semantic forms. 4368 // Note also that ASTStmtWriter assumes this encoding. 4369 4370 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); } 4371 const Expr * const *getSubExprsBuffer() const { 4372 return reinterpret_cast<const Expr * const *>(this + 1); 4373 } 4374 4375 friend class ASTStmtReader; 4376 4377 PseudoObjectExpr(QualType type, ExprValueKind VK, 4378 Expr *syntactic, ArrayRef<Expr*> semantic, 4379 unsigned resultIndex); 4380 4381 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4382 4383 unsigned getNumSubExprs() const { 4384 return PseudoObjectExprBits.NumSubExprs; 4385 } 4386 4387public: 4388 /// NoResult - A value for the result index indicating that there is 4389 /// no semantic result. 4390 enum { NoResult = ~0U }; 4391 4392 static PseudoObjectExpr *Create(ASTContext &Context, Expr *syntactic, 4393 ArrayRef<Expr*> semantic, 4394 unsigned resultIndex); 4395 4396 static PseudoObjectExpr *Create(ASTContext &Context, EmptyShell shell, 4397 unsigned numSemanticExprs); 4398 4399 /// Return the syntactic form of this expression, i.e. the 4400 /// expression it actually looks like. Likely to be expressed in 4401 /// terms of OpaqueValueExprs bound in the semantic form. 4402 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 4403 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 4404 4405 /// Return the index of the result-bearing expression into the semantics 4406 /// expressions, or PseudoObjectExpr::NoResult if there is none. 4407 unsigned getResultExprIndex() const { 4408 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 4409 return PseudoObjectExprBits.ResultIndex - 1; 4410 } 4411 4412 /// Return the result-bearing expression, or null if there is none. 4413 Expr *getResultExpr() { 4414 if (PseudoObjectExprBits.ResultIndex == 0) 4415 return 0; 4416 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 4417 } 4418 const Expr *getResultExpr() const { 4419 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 4420 } 4421 4422 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 4423 4424 typedef Expr * const *semantics_iterator; 4425 typedef const Expr * const *const_semantics_iterator; 4426 semantics_iterator semantics_begin() { 4427 return getSubExprsBuffer() + 1; 4428 } 4429 const_semantics_iterator semantics_begin() const { 4430 return getSubExprsBuffer() + 1; 4431 } 4432 semantics_iterator semantics_end() { 4433 return getSubExprsBuffer() + getNumSubExprs(); 4434 } 4435 const_semantics_iterator semantics_end() const { 4436 return getSubExprsBuffer() + getNumSubExprs(); 4437 } 4438 Expr *getSemanticExpr(unsigned index) { 4439 assert(index + 1 < getNumSubExprs()); 4440 return getSubExprsBuffer()[index + 1]; 4441 } 4442 const Expr *getSemanticExpr(unsigned index) const { 4443 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 4444 } 4445 4446 SourceLocation getExprLoc() const { 4447 return getSyntacticForm()->getExprLoc(); 4448 } 4449 SourceRange getSourceRange() const { 4450 return getSyntacticForm()->getSourceRange(); 4451 } 4452 4453 child_range children() { 4454 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer()); 4455 return child_range(cs, cs + getNumSubExprs()); 4456 } 4457 4458 static bool classof(const Stmt *T) { 4459 return T->getStmtClass() == PseudoObjectExprClass; 4460 } 4461 static bool classof(const PseudoObjectExpr *) { return true; } 4462}; 4463 4464/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4465/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4466/// similarly-named C++0x instructions. All of these instructions take one 4467/// primary pointer and at least one memory order. 4468class AtomicExpr : public Expr { 4469public: 4470 enum AtomicOp { Load, Store, CmpXchgStrong, CmpXchgWeak, Xchg, 4471 Add, Sub, And, Or, Xor, Init }; 4472private: 4473 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, END_EXPR }; 4474 Stmt* SubExprs[END_EXPR]; 4475 unsigned NumSubExprs; 4476 SourceLocation BuiltinLoc, RParenLoc; 4477 AtomicOp Op; 4478 4479public: 4480 AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, QualType t, 4481 AtomicOp op, SourceLocation RP); 4482 4483 /// \brief Build an empty AtomicExpr. 4484 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4485 4486 Expr *getPtr() const { 4487 return cast<Expr>(SubExprs[PTR]); 4488 } 4489 void setPtr(Expr *E) { 4490 SubExprs[PTR] = E; 4491 } 4492 Expr *getOrder() const { 4493 return cast<Expr>(SubExprs[ORDER]); 4494 } 4495 void setOrder(Expr *E) { 4496 SubExprs[ORDER] = E; 4497 } 4498 Expr *getVal1() const { 4499 if (Op == Init) 4500 return cast<Expr>(SubExprs[ORDER]); 4501 assert(NumSubExprs >= 3); 4502 return cast<Expr>(SubExprs[VAL1]); 4503 } 4504 void setVal1(Expr *E) { 4505 if (Op == Init) { 4506 SubExprs[ORDER] = E; 4507 return; 4508 } 4509 assert(NumSubExprs >= 3); 4510 SubExprs[VAL1] = E; 4511 } 4512 Expr *getOrderFail() const { 4513 assert(NumSubExprs == 5); 4514 return cast<Expr>(SubExprs[ORDER_FAIL]); 4515 } 4516 void setOrderFail(Expr *E) { 4517 assert(NumSubExprs == 5); 4518 SubExprs[ORDER_FAIL] = E; 4519 } 4520 Expr *getVal2() const { 4521 assert(NumSubExprs == 5); 4522 return cast<Expr>(SubExprs[VAL2]); 4523 } 4524 void setVal2(Expr *E) { 4525 assert(NumSubExprs == 5); 4526 SubExprs[VAL2] = E; 4527 } 4528 4529 AtomicOp getOp() const { return Op; } 4530 void setOp(AtomicOp op) { Op = op; } 4531 unsigned getNumSubExprs() { return NumSubExprs; } 4532 void setNumSubExprs(unsigned num) { NumSubExprs = num; } 4533 4534 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4535 4536 bool isVolatile() const { 4537 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4538 } 4539 4540 bool isCmpXChg() const { 4541 return getOp() == AtomicExpr::CmpXchgStrong || 4542 getOp() == AtomicExpr::CmpXchgWeak; 4543 } 4544 4545 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4546 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 4547 4548 SourceLocation getRParenLoc() const { return RParenLoc; } 4549 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 4550 4551 SourceRange getSourceRange() const { 4552 return SourceRange(BuiltinLoc, RParenLoc); 4553 } 4554 static bool classof(const Stmt *T) { 4555 return T->getStmtClass() == AtomicExprClass; 4556 } 4557 static bool classof(const AtomicExpr *) { return true; } 4558 4559 // Iterators 4560 child_range children() { 4561 return child_range(SubExprs, SubExprs+NumSubExprs); 4562 } 4563}; 4564} // end namespace clang 4565 4566#endif 4567