Expr.h revision 8fbc6d23d61213750ba1fdcb0b4b9d3d54bbc32f
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "clang/AST/DeclAccessPair.h" 21#include "clang/AST/OperationKinds.h" 22#include "clang/AST/ASTVector.h" 23#include "clang/AST/TemplateBase.h" 24#include "clang/Basic/TargetInfo.h" 25#include "clang/Basic/TypeTraits.h" 26#include "llvm/ADT/APSInt.h" 27#include "llvm/ADT/APFloat.h" 28#include "llvm/ADT/SmallVector.h" 29#include "llvm/ADT/StringRef.h" 30#include <cctype> 31 32namespace clang { 33 class ASTContext; 34 class APValue; 35 class Decl; 36 class IdentifierInfo; 37 class ParmVarDecl; 38 class NamedDecl; 39 class ValueDecl; 40 class BlockDecl; 41 class CXXBaseSpecifier; 42 class CXXOperatorCallExpr; 43 class CXXMemberCallExpr; 44 class ObjCPropertyRefExpr; 45 class OpaqueValueExpr; 46 47/// \brief A simple array of base specifiers. 48typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 49 50/// Expr - This represents one expression. Note that Expr's are subclasses of 51/// Stmt. This allows an expression to be transparently used any place a Stmt 52/// is required. 53/// 54class Expr : public Stmt { 55 QualType TR; 56 57protected: 58 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 59 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 60 : Stmt(SC) 61 { 62 ExprBits.TypeDependent = TD; 63 ExprBits.ValueDependent = VD; 64 ExprBits.InstantiationDependent = ID; 65 ExprBits.ValueKind = VK; 66 ExprBits.ObjectKind = OK; 67 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 68 setType(T); 69 } 70 71 /// \brief Construct an empty expression. 72 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 73 74public: 75 QualType getType() const { return TR; } 76 void setType(QualType t) { 77 // In C++, the type of an expression is always adjusted so that it 78 // will not have reference type an expression will never have 79 // reference type (C++ [expr]p6). Use 80 // QualType::getNonReferenceType() to retrieve the non-reference 81 // type. Additionally, inspect Expr::isLvalue to determine whether 82 // an expression that is adjusted in this manner should be 83 // considered an lvalue. 84 assert((t.isNull() || !t->isReferenceType()) && 85 "Expressions can't have reference type"); 86 87 TR = t; 88 } 89 90 /// isValueDependent - Determines whether this expression is 91 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 92 /// array bound of "Chars" in the following example is 93 /// value-dependent. 94 /// @code 95 /// template<int Size, char (&Chars)[Size]> struct meta_string; 96 /// @endcode 97 bool isValueDependent() const { return ExprBits.ValueDependent; } 98 99 /// \brief Set whether this expression is value-dependent or not. 100 void setValueDependent(bool VD) { 101 ExprBits.ValueDependent = VD; 102 if (VD) 103 ExprBits.InstantiationDependent = true; 104 } 105 106 /// isTypeDependent - Determines whether this expression is 107 /// type-dependent (C++ [temp.dep.expr]), which means that its type 108 /// could change from one template instantiation to the next. For 109 /// example, the expressions "x" and "x + y" are type-dependent in 110 /// the following code, but "y" is not type-dependent: 111 /// @code 112 /// template<typename T> 113 /// void add(T x, int y) { 114 /// x + y; 115 /// } 116 /// @endcode 117 bool isTypeDependent() const { return ExprBits.TypeDependent; } 118 119 /// \brief Set whether this expression is type-dependent or not. 120 void setTypeDependent(bool TD) { 121 ExprBits.TypeDependent = TD; 122 if (TD) 123 ExprBits.InstantiationDependent = true; 124 } 125 126 /// \brief Whether this expression is instantiation-dependent, meaning that 127 /// it depends in some way on a template parameter, even if neither its type 128 /// nor (constant) value can change due to the template instantiation. 129 /// 130 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 131 /// instantiation-dependent (since it involves a template parameter \c T), but 132 /// is neither type- nor value-dependent, since the type of the inner 133 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 134 /// \c sizeof is known. 135 /// 136 /// \code 137 /// template<typename T> 138 /// void f(T x, T y) { 139 /// sizeof(sizeof(T() + T()); 140 /// } 141 /// \endcode 142 /// 143 bool isInstantiationDependent() const { 144 return ExprBits.InstantiationDependent; 145 } 146 147 /// \brief Set whether this expression is instantiation-dependent or not. 148 void setInstantiationDependent(bool ID) { 149 ExprBits.InstantiationDependent = ID; 150 } 151 152 /// \brief Whether this expression contains an unexpanded parameter 153 /// pack (for C++0x variadic templates). 154 /// 155 /// Given the following function template: 156 /// 157 /// \code 158 /// template<typename F, typename ...Types> 159 /// void forward(const F &f, Types &&...args) { 160 /// f(static_cast<Types&&>(args)...); 161 /// } 162 /// \endcode 163 /// 164 /// The expressions \c args and \c static_cast<Types&&>(args) both 165 /// contain parameter packs. 166 bool containsUnexpandedParameterPack() const { 167 return ExprBits.ContainsUnexpandedParameterPack; 168 } 169 170 /// \brief Set the bit that describes whether this expression 171 /// contains an unexpanded parameter pack. 172 void setContainsUnexpandedParameterPack(bool PP = true) { 173 ExprBits.ContainsUnexpandedParameterPack = PP; 174 } 175 176 /// getExprLoc - Return the preferred location for the arrow when diagnosing 177 /// a problem with a generic expression. 178 SourceLocation getExprLoc() const; 179 180 /// isUnusedResultAWarning - Return true if this immediate expression should 181 /// be warned about if the result is unused. If so, fill in Loc and Ranges 182 /// with location to warn on and the source range[s] to report with the 183 /// warning. 184 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 185 SourceRange &R2, ASTContext &Ctx) const; 186 187 /// isLValue - True if this expression is an "l-value" according to 188 /// the rules of the current language. C and C++ give somewhat 189 /// different rules for this concept, but in general, the result of 190 /// an l-value expression identifies a specific object whereas the 191 /// result of an r-value expression is a value detached from any 192 /// specific storage. 193 /// 194 /// C++0x divides the concept of "r-value" into pure r-values 195 /// ("pr-values") and so-called expiring values ("x-values"), which 196 /// identify specific objects that can be safely cannibalized for 197 /// their resources. This is an unfortunate abuse of terminology on 198 /// the part of the C++ committee. In Clang, when we say "r-value", 199 /// we generally mean a pr-value. 200 bool isLValue() const { return getValueKind() == VK_LValue; } 201 bool isRValue() const { return getValueKind() == VK_RValue; } 202 bool isXValue() const { return getValueKind() == VK_XValue; } 203 bool isGLValue() const { return getValueKind() != VK_RValue; } 204 205 enum LValueClassification { 206 LV_Valid, 207 LV_NotObjectType, 208 LV_IncompleteVoidType, 209 LV_DuplicateVectorComponents, 210 LV_InvalidExpression, 211 LV_InvalidMessageExpression, 212 LV_MemberFunction, 213 LV_SubObjCPropertySetting, 214 LV_ClassTemporary 215 }; 216 /// Reasons why an expression might not be an l-value. 217 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 218 219 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 220 /// does not have an incomplete type, does not have a const-qualified type, 221 /// and if it is a structure or union, does not have any member (including, 222 /// recursively, any member or element of all contained aggregates or unions) 223 /// with a const-qualified type. 224 /// 225 /// \param Loc [in] [out] - A source location which *may* be filled 226 /// in with the location of the expression making this a 227 /// non-modifiable lvalue, if specified. 228 enum isModifiableLvalueResult { 229 MLV_Valid, 230 MLV_NotObjectType, 231 MLV_IncompleteVoidType, 232 MLV_DuplicateVectorComponents, 233 MLV_InvalidExpression, 234 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 235 MLV_IncompleteType, 236 MLV_ConstQualified, 237 MLV_ArrayType, 238 MLV_NotBlockQualified, 239 MLV_ReadonlyProperty, 240 MLV_NoSetterProperty, 241 MLV_MemberFunction, 242 MLV_SubObjCPropertySetting, 243 MLV_InvalidMessageExpression, 244 MLV_ClassTemporary 245 }; 246 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 247 SourceLocation *Loc = 0) const; 248 249 /// \brief The return type of classify(). Represents the C++0x expression 250 /// taxonomy. 251 class Classification { 252 public: 253 /// \brief The various classification results. Most of these mean prvalue. 254 enum Kinds { 255 CL_LValue, 256 CL_XValue, 257 CL_Function, // Functions cannot be lvalues in C. 258 CL_Void, // Void cannot be an lvalue in C. 259 CL_AddressableVoid, // Void expression whose address can be taken in C. 260 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 261 CL_MemberFunction, // An expression referring to a member function 262 CL_SubObjCPropertySetting, 263 CL_ClassTemporary, // A prvalue of class type 264 CL_ObjCMessageRValue, // ObjC message is an rvalue 265 CL_PRValue // A prvalue for any other reason, of any other type 266 }; 267 /// \brief The results of modification testing. 268 enum ModifiableType { 269 CM_Untested, // testModifiable was false. 270 CM_Modifiable, 271 CM_RValue, // Not modifiable because it's an rvalue 272 CM_Function, // Not modifiable because it's a function; C++ only 273 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 274 CM_NotBlockQualified, // Not captured in the closure 275 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 276 CM_ConstQualified, 277 CM_ArrayType, 278 CM_IncompleteType 279 }; 280 281 private: 282 friend class Expr; 283 284 unsigned short Kind; 285 unsigned short Modifiable; 286 287 explicit Classification(Kinds k, ModifiableType m) 288 : Kind(k), Modifiable(m) 289 {} 290 291 public: 292 Classification() {} 293 294 Kinds getKind() const { return static_cast<Kinds>(Kind); } 295 ModifiableType getModifiable() const { 296 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 297 return static_cast<ModifiableType>(Modifiable); 298 } 299 bool isLValue() const { return Kind == CL_LValue; } 300 bool isXValue() const { return Kind == CL_XValue; } 301 bool isGLValue() const { return Kind <= CL_XValue; } 302 bool isPRValue() const { return Kind >= CL_Function; } 303 bool isRValue() const { return Kind >= CL_XValue; } 304 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 305 306 /// \brief Create a simple, modifiably lvalue 307 static Classification makeSimpleLValue() { 308 return Classification(CL_LValue, CM_Modifiable); 309 } 310 311 }; 312 /// \brief Classify - Classify this expression according to the C++0x 313 /// expression taxonomy. 314 /// 315 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 316 /// old lvalue vs rvalue. This function determines the type of expression this 317 /// is. There are three expression types: 318 /// - lvalues are classical lvalues as in C++03. 319 /// - prvalues are equivalent to rvalues in C++03. 320 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 321 /// function returning an rvalue reference. 322 /// lvalues and xvalues are collectively referred to as glvalues, while 323 /// prvalues and xvalues together form rvalues. 324 Classification Classify(ASTContext &Ctx) const { 325 return ClassifyImpl(Ctx, 0); 326 } 327 328 /// \brief ClassifyModifiable - Classify this expression according to the 329 /// C++0x expression taxonomy, and see if it is valid on the left side 330 /// of an assignment. 331 /// 332 /// This function extends classify in that it also tests whether the 333 /// expression is modifiable (C99 6.3.2.1p1). 334 /// \param Loc A source location that might be filled with a relevant location 335 /// if the expression is not modifiable. 336 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 337 return ClassifyImpl(Ctx, &Loc); 338 } 339 340 /// getValueKindForType - Given a formal return or parameter type, 341 /// give its value kind. 342 static ExprValueKind getValueKindForType(QualType T) { 343 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 344 return (isa<LValueReferenceType>(RT) 345 ? VK_LValue 346 : (RT->getPointeeType()->isFunctionType() 347 ? VK_LValue : VK_XValue)); 348 return VK_RValue; 349 } 350 351 /// getValueKind - The value kind that this expression produces. 352 ExprValueKind getValueKind() const { 353 return static_cast<ExprValueKind>(ExprBits.ValueKind); 354 } 355 356 /// getObjectKind - The object kind that this expression produces. 357 /// Object kinds are meaningful only for expressions that yield an 358 /// l-value or x-value. 359 ExprObjectKind getObjectKind() const { 360 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 361 } 362 363 bool isOrdinaryOrBitFieldObject() const { 364 ExprObjectKind OK = getObjectKind(); 365 return (OK == OK_Ordinary || OK == OK_BitField); 366 } 367 368 /// setValueKind - Set the value kind produced by this expression. 369 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 370 371 /// setObjectKind - Set the object kind produced by this expression. 372 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 373 374private: 375 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 376 377public: 378 379 /// \brief If this expression refers to a bit-field, retrieve the 380 /// declaration of that bit-field. 381 FieldDecl *getBitField(); 382 383 const FieldDecl *getBitField() const { 384 return const_cast<Expr*>(this)->getBitField(); 385 } 386 387 /// \brief If this expression is an l-value for an Objective C 388 /// property, find the underlying property reference expression. 389 const ObjCPropertyRefExpr *getObjCProperty() const; 390 391 /// \brief Returns whether this expression refers to a vector element. 392 bool refersToVectorElement() const; 393 394 /// \brief Returns whether this expression has a placeholder type. 395 bool hasPlaceholderType() const { 396 return getType()->isPlaceholderType(); 397 } 398 399 /// \brief Returns whether this expression has a specific placeholder type. 400 bool hasPlaceholderType(BuiltinType::Kind K) const { 401 assert(BuiltinType::isPlaceholderTypeKind(K)); 402 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 403 return BT->getKind() == K; 404 return false; 405 } 406 407 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 408 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 409 /// but also int expressions which are produced by things like comparisons in 410 /// C. 411 bool isKnownToHaveBooleanValue() const; 412 413 /// isIntegerConstantExpr - Return true if this expression is a valid integer 414 /// constant expression, and, if so, return its value in Result. If not a 415 /// valid i-c-e, return false and fill in Loc (if specified) with the location 416 /// of the invalid expression. 417 /// 418 /// Note: This does not perform the implicit conversions required by C++11 419 /// [expr.const]p5. 420 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 421 SourceLocation *Loc = 0, 422 bool isEvaluated = true) const; 423 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const; 424 425 /// isCXX98IntegralConstantExpr - Return true if this expression is an 426 /// integral constant expression in C++98. Can only be used in C++. 427 bool isCXX98IntegralConstantExpr(ASTContext &Ctx) const; 428 429 /// isCXX11ConstantExpr - Return true if this expression is a constant 430 /// expression in C++11. Can only be used in C++. 431 /// 432 /// Note: This does not perform the implicit conversions required by C++11 433 /// [expr.const]p5. 434 bool isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result = 0, 435 SourceLocation *Loc = 0) const; 436 437 /// isPotentialConstantExpr - Return true if this function's definition 438 /// might be usable in a constant expression in C++11, if it were marked 439 /// constexpr. Return false if the function can never produce a constant 440 /// expression, along with diagnostics describing why not. 441 static bool isPotentialConstantExpr(const FunctionDecl *FD, 442 llvm::SmallVectorImpl< 443 PartialDiagnosticAt> &Diags); 444 445 /// isConstantInitializer - Returns true if this expression can be emitted to 446 /// IR as a constant, and thus can be used as a constant initializer in C. 447 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 448 449 /// EvalStatus is a struct with detailed info about an evaluation in progress. 450 struct EvalStatus { 451 /// HasSideEffects - Whether the evaluated expression has side effects. 452 /// For example, (f() && 0) can be folded, but it still has side effects. 453 bool HasSideEffects; 454 455 /// Diag - If this is non-null, it will be filled in with a stack of notes 456 /// indicating why evaluation failed (or why it failed to produce a constant 457 /// expression). 458 /// If the expression is unfoldable, the notes will indicate why it's not 459 /// foldable. If the expression is foldable, but not a constant expression, 460 /// the notes will describes why it isn't a constant expression. If the 461 /// expression *is* a constant expression, no notes will be produced. 462 llvm::SmallVectorImpl<PartialDiagnosticAt> *Diag; 463 464 EvalStatus() : HasSideEffects(false), Diag(0) {} 465 466 // hasSideEffects - Return true if the evaluated expression has 467 // side effects. 468 bool hasSideEffects() const { 469 return HasSideEffects; 470 } 471 }; 472 473 /// EvalResult is a struct with detailed info about an evaluated expression. 474 struct EvalResult : EvalStatus { 475 /// Val - This is the value the expression can be folded to. 476 APValue Val; 477 478 // isGlobalLValue - Return true if the evaluated lvalue expression 479 // is global. 480 bool isGlobalLValue() const; 481 }; 482 483 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 484 /// an rvalue using any crazy technique (that has nothing to do with language 485 /// standards) that we want to, even if the expression has side-effects. If 486 /// this function returns true, it returns the folded constant in Result. If 487 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 488 /// applied. 489 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 490 491 /// EvaluateAsBooleanCondition - Return true if this is a constant 492 /// which we we can fold and convert to a boolean condition using 493 /// any crazy technique that we want to, even if the expression has 494 /// side-effects. 495 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 496 497 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects }; 498 499 /// EvaluateAsInt - Return true if this is a constant which we can fold and 500 /// convert to an integer, using any crazy technique that we want to. 501 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 502 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 503 504 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 505 /// constant folded without side-effects, but discard the result. 506 bool isEvaluatable(const ASTContext &Ctx) const; 507 508 /// HasSideEffects - This routine returns true for all those expressions 509 /// which must be evaluated each time and must not be optimized away 510 /// or evaluated at compile time. Example is a function call, volatile 511 /// variable read. 512 bool HasSideEffects(const ASTContext &Ctx) const; 513 514 /// \brief Determine whether this expression involves a call to any function 515 /// that is not trivial. 516 bool hasNonTrivialCall(ASTContext &Ctx); 517 518 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 519 /// integer. This must be called on an expression that constant folds to an 520 /// integer. 521 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 522 523 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 524 /// lvalue with link time known address, with no side-effects. 525 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 526 527 /// EvaluateAsInitializer - Evaluate an expression as if it were the 528 /// initializer of the given declaration. Returns true if the initializer 529 /// can be folded to a constant, and produces any relevant notes. In C++11, 530 /// notes will be produced if the expression is not a constant expression. 531 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 532 const VarDecl *VD, 533 llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 534 535 /// \brief Enumeration used to describe the kind of Null pointer constant 536 /// returned from \c isNullPointerConstant(). 537 enum NullPointerConstantKind { 538 /// \brief Expression is not a Null pointer constant. 539 NPCK_NotNull = 0, 540 541 /// \brief Expression is a Null pointer constant built from a zero integer. 542 NPCK_ZeroInteger, 543 544 /// \brief Expression is a C++0X nullptr. 545 NPCK_CXX0X_nullptr, 546 547 /// \brief Expression is a GNU-style __null constant. 548 NPCK_GNUNull 549 }; 550 551 /// \brief Enumeration used to describe how \c isNullPointerConstant() 552 /// should cope with value-dependent expressions. 553 enum NullPointerConstantValueDependence { 554 /// \brief Specifies that the expression should never be value-dependent. 555 NPC_NeverValueDependent = 0, 556 557 /// \brief Specifies that a value-dependent expression of integral or 558 /// dependent type should be considered a null pointer constant. 559 NPC_ValueDependentIsNull, 560 561 /// \brief Specifies that a value-dependent expression should be considered 562 /// to never be a null pointer constant. 563 NPC_ValueDependentIsNotNull 564 }; 565 566 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 567 /// a Null pointer constant. The return value can further distinguish the 568 /// kind of NULL pointer constant that was detected. 569 NullPointerConstantKind isNullPointerConstant( 570 ASTContext &Ctx, 571 NullPointerConstantValueDependence NPC) const; 572 573 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 574 /// write barrier. 575 bool isOBJCGCCandidate(ASTContext &Ctx) const; 576 577 /// \brief Returns true if this expression is a bound member function. 578 bool isBoundMemberFunction(ASTContext &Ctx) const; 579 580 /// \brief Given an expression of bound-member type, find the type 581 /// of the member. Returns null if this is an *overloaded* bound 582 /// member expression. 583 static QualType findBoundMemberType(const Expr *expr); 584 585 /// \brief Result type of CanThrow(). 586 enum CanThrowResult { 587 CT_Cannot, 588 CT_Dependent, 589 CT_Can 590 }; 591 /// \brief Test if this expression, if evaluated, might throw, according to 592 /// the rules of C++ [expr.unary.noexcept]. 593 CanThrowResult CanThrow(ASTContext &C) const; 594 595 /// IgnoreImpCasts - Skip past any implicit casts which might 596 /// surround this expression. Only skips ImplicitCastExprs. 597 Expr *IgnoreImpCasts(); 598 599 /// IgnoreImplicit - Skip past any implicit AST nodes which might 600 /// surround this expression. 601 Expr *IgnoreImplicit() { return cast<Expr>(Stmt::IgnoreImplicit()); } 602 603 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 604 /// its subexpression. If that subexpression is also a ParenExpr, 605 /// then this method recursively returns its subexpression, and so forth. 606 /// Otherwise, the method returns the current Expr. 607 Expr *IgnoreParens(); 608 609 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 610 /// or CastExprs, returning their operand. 611 Expr *IgnoreParenCasts(); 612 613 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 614 /// any ParenExpr or ImplicitCastExprs, returning their operand. 615 Expr *IgnoreParenImpCasts(); 616 617 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 618 /// call to a conversion operator, return the argument. 619 Expr *IgnoreConversionOperator(); 620 621 const Expr *IgnoreConversionOperator() const { 622 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 623 } 624 625 const Expr *IgnoreParenImpCasts() const { 626 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 627 } 628 629 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 630 /// CastExprs that represent lvalue casts, returning their operand. 631 Expr *IgnoreParenLValueCasts(); 632 633 const Expr *IgnoreParenLValueCasts() const { 634 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 635 } 636 637 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 638 /// value (including ptr->int casts of the same size). Strip off any 639 /// ParenExpr or CastExprs, returning their operand. 640 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 641 642 /// \brief Determine whether this expression is a default function argument. 643 /// 644 /// Default arguments are implicitly generated in the abstract syntax tree 645 /// by semantic analysis for function calls, object constructions, etc. in 646 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 647 /// this routine also looks through any implicit casts to determine whether 648 /// the expression is a default argument. 649 bool isDefaultArgument() const; 650 651 /// \brief Determine whether the result of this expression is a 652 /// temporary object of the given class type. 653 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 654 655 /// \brief Whether this expression is an implicit reference to 'this' in C++. 656 bool isImplicitCXXThis() const; 657 658 const Expr *IgnoreImpCasts() const { 659 return const_cast<Expr*>(this)->IgnoreImpCasts(); 660 } 661 const Expr *IgnoreParens() const { 662 return const_cast<Expr*>(this)->IgnoreParens(); 663 } 664 const Expr *IgnoreParenCasts() const { 665 return const_cast<Expr*>(this)->IgnoreParenCasts(); 666 } 667 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 668 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 669 } 670 671 static bool hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs); 672 673 static bool classof(const Stmt *T) { 674 return T->getStmtClass() >= firstExprConstant && 675 T->getStmtClass() <= lastExprConstant; 676 } 677 static bool classof(const Expr *) { return true; } 678}; 679 680 681//===----------------------------------------------------------------------===// 682// Primary Expressions. 683//===----------------------------------------------------------------------===// 684 685/// OpaqueValueExpr - An expression referring to an opaque object of a 686/// fixed type and value class. These don't correspond to concrete 687/// syntax; instead they're used to express operations (usually copy 688/// operations) on values whose source is generally obvious from 689/// context. 690class OpaqueValueExpr : public Expr { 691 friend class ASTStmtReader; 692 Expr *SourceExpr; 693 SourceLocation Loc; 694 695public: 696 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 697 ExprObjectKind OK = OK_Ordinary, 698 Expr *SourceExpr = 0) 699 : Expr(OpaqueValueExprClass, T, VK, OK, 700 T->isDependentType(), 701 T->isDependentType() || 702 (SourceExpr && SourceExpr->isValueDependent()), 703 T->isInstantiationDependentType(), 704 false), 705 SourceExpr(SourceExpr), Loc(Loc) { 706 } 707 708 /// Given an expression which invokes a copy constructor --- i.e. a 709 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 710 /// find the OpaqueValueExpr that's the source of the construction. 711 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 712 713 explicit OpaqueValueExpr(EmptyShell Empty) 714 : Expr(OpaqueValueExprClass, Empty) { } 715 716 /// \brief Retrieve the location of this expression. 717 SourceLocation getLocation() const { return Loc; } 718 719 SourceRange getSourceRange() const { 720 if (SourceExpr) return SourceExpr->getSourceRange(); 721 return Loc; 722 } 723 SourceLocation getExprLoc() const { 724 if (SourceExpr) return SourceExpr->getExprLoc(); 725 return Loc; 726 } 727 728 child_range children() { return child_range(); } 729 730 /// The source expression of an opaque value expression is the 731 /// expression which originally generated the value. This is 732 /// provided as a convenience for analyses that don't wish to 733 /// precisely model the execution behavior of the program. 734 /// 735 /// The source expression is typically set when building the 736 /// expression which binds the opaque value expression in the first 737 /// place. 738 Expr *getSourceExpr() const { return SourceExpr; } 739 740 static bool classof(const Stmt *T) { 741 return T->getStmtClass() == OpaqueValueExprClass; 742 } 743 static bool classof(const OpaqueValueExpr *) { return true; } 744}; 745 746/// \brief A reference to a declared variable, function, enum, etc. 747/// [C99 6.5.1p2] 748/// 749/// This encodes all the information about how a declaration is referenced 750/// within an expression. 751/// 752/// There are several optional constructs attached to DeclRefExprs only when 753/// they apply in order to conserve memory. These are laid out past the end of 754/// the object, and flags in the DeclRefExprBitfield track whether they exist: 755/// 756/// DeclRefExprBits.HasQualifier: 757/// Specifies when this declaration reference expression has a C++ 758/// nested-name-specifier. 759/// DeclRefExprBits.HasFoundDecl: 760/// Specifies when this declaration reference expression has a record of 761/// a NamedDecl (different from the referenced ValueDecl) which was found 762/// during name lookup and/or overload resolution. 763/// DeclRefExprBits.HasTemplateKWAndArgsInfo: 764/// Specifies when this declaration reference expression has an explicit 765/// C++ template keyword and/or template argument list. 766class DeclRefExpr : public Expr { 767 /// \brief The declaration that we are referencing. 768 ValueDecl *D; 769 770 /// \brief The location of the declaration name itself. 771 SourceLocation Loc; 772 773 /// \brief Provides source/type location info for the declaration name 774 /// embedded in D. 775 DeclarationNameLoc DNLoc; 776 777 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 778 NestedNameSpecifierLoc &getInternalQualifierLoc() { 779 assert(hasQualifier()); 780 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 781 } 782 783 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 784 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 785 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 786 } 787 788 /// \brief Test whether there is a distinct FoundDecl attached to the end of 789 /// this DRE. 790 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 791 792 /// \brief Helper to retrieve the optional NamedDecl through which this 793 /// reference occured. 794 NamedDecl *&getInternalFoundDecl() { 795 assert(hasFoundDecl()); 796 if (hasQualifier()) 797 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 798 return *reinterpret_cast<NamedDecl **>(this + 1); 799 } 800 801 /// \brief Helper to retrieve the optional NamedDecl through which this 802 /// reference occured. 803 NamedDecl *getInternalFoundDecl() const { 804 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 805 } 806 807 DeclRefExpr(ASTContext &Ctx, 808 NestedNameSpecifierLoc QualifierLoc, 809 SourceLocation TemplateKWLoc, 810 ValueDecl *D, const DeclarationNameInfo &NameInfo, 811 NamedDecl *FoundD, 812 const TemplateArgumentListInfo *TemplateArgs, 813 QualType T, ExprValueKind VK); 814 815 /// \brief Construct an empty declaration reference expression. 816 explicit DeclRefExpr(EmptyShell Empty) 817 : Expr(DeclRefExprClass, Empty) { } 818 819 /// \brief Computes the type- and value-dependence flags for this 820 /// declaration reference expression. 821 void computeDependence(ASTContext &C); 822 823public: 824 DeclRefExpr(ValueDecl *D, QualType T, ExprValueKind VK, SourceLocation L, 825 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 826 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 827 D(D), Loc(L), DNLoc(LocInfo) { 828 DeclRefExprBits.HasQualifier = 0; 829 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 830 DeclRefExprBits.HasFoundDecl = 0; 831 DeclRefExprBits.HadMultipleCandidates = 0; 832 computeDependence(D->getASTContext()); 833 } 834 835 static DeclRefExpr *Create(ASTContext &Context, 836 NestedNameSpecifierLoc QualifierLoc, 837 SourceLocation TemplateKWLoc, 838 ValueDecl *D, 839 SourceLocation NameLoc, 840 QualType T, ExprValueKind VK, 841 NamedDecl *FoundD = 0, 842 const TemplateArgumentListInfo *TemplateArgs = 0); 843 844 static DeclRefExpr *Create(ASTContext &Context, 845 NestedNameSpecifierLoc QualifierLoc, 846 SourceLocation TemplateKWLoc, 847 ValueDecl *D, 848 const DeclarationNameInfo &NameInfo, 849 QualType T, ExprValueKind VK, 850 NamedDecl *FoundD = 0, 851 const TemplateArgumentListInfo *TemplateArgs = 0); 852 853 /// \brief Construct an empty declaration reference expression. 854 static DeclRefExpr *CreateEmpty(ASTContext &Context, 855 bool HasQualifier, 856 bool HasFoundDecl, 857 bool HasTemplateKWAndArgsInfo, 858 unsigned NumTemplateArgs); 859 860 ValueDecl *getDecl() { return D; } 861 const ValueDecl *getDecl() const { return D; } 862 void setDecl(ValueDecl *NewD) { D = NewD; } 863 864 DeclarationNameInfo getNameInfo() const { 865 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 866 } 867 868 SourceLocation getLocation() const { return Loc; } 869 void setLocation(SourceLocation L) { Loc = L; } 870 SourceRange getSourceRange() const; 871 SourceLocation getLocStart() const; 872 SourceLocation getLocEnd() const; 873 874 /// \brief Determine whether this declaration reference was preceded by a 875 /// C++ nested-name-specifier, e.g., \c N::foo. 876 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 877 878 /// \brief If the name was qualified, retrieves the nested-name-specifier 879 /// that precedes the name. Otherwise, returns NULL. 880 NestedNameSpecifier *getQualifier() const { 881 if (!hasQualifier()) 882 return 0; 883 884 return getInternalQualifierLoc().getNestedNameSpecifier(); 885 } 886 887 /// \brief If the name was qualified, retrieves the nested-name-specifier 888 /// that precedes the name, with source-location information. 889 NestedNameSpecifierLoc getQualifierLoc() const { 890 if (!hasQualifier()) 891 return NestedNameSpecifierLoc(); 892 893 return getInternalQualifierLoc(); 894 } 895 896 /// \brief Get the NamedDecl through which this reference occured. 897 /// 898 /// This Decl may be different from the ValueDecl actually referred to in the 899 /// presence of using declarations, etc. It always returns non-NULL, and may 900 /// simple return the ValueDecl when appropriate. 901 NamedDecl *getFoundDecl() { 902 return hasFoundDecl() ? getInternalFoundDecl() : D; 903 } 904 905 /// \brief Get the NamedDecl through which this reference occurred. 906 /// See non-const variant. 907 const NamedDecl *getFoundDecl() const { 908 return hasFoundDecl() ? getInternalFoundDecl() : D; 909 } 910 911 bool hasTemplateKWAndArgsInfo() const { 912 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 913 } 914 915 /// \brief Return the optional template keyword and arguments info. 916 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 917 if (!hasTemplateKWAndArgsInfo()) 918 return 0; 919 920 if (hasFoundDecl()) 921 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 922 &getInternalFoundDecl() + 1); 923 924 if (hasQualifier()) 925 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 926 &getInternalQualifierLoc() + 1); 927 928 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 929 } 930 931 /// \brief Return the optional template keyword and arguments info. 932 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 933 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo(); 934 } 935 936 /// \brief Retrieve the location of the template keyword preceding 937 /// this name, if any. 938 SourceLocation getTemplateKeywordLoc() const { 939 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 940 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 941 } 942 943 /// \brief Retrieve the location of the left angle bracket starting the 944 /// explicit template argument list following the name, if any. 945 SourceLocation getLAngleLoc() const { 946 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 947 return getTemplateKWAndArgsInfo()->LAngleLoc; 948 } 949 950 /// \brief Retrieve the location of the right angle bracket ending the 951 /// explicit template argument list following the name, if any. 952 SourceLocation getRAngleLoc() const { 953 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 954 return getTemplateKWAndArgsInfo()->RAngleLoc; 955 } 956 957 /// \brief Determines whether the name in this declaration reference 958 /// was preceded by the template keyword. 959 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 960 961 /// \brief Determines whether this declaration reference was followed by an 962 /// explicit template argument list. 963 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 964 965 /// \brief Retrieve the explicit template argument list that followed the 966 /// member template name. 967 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 968 assert(hasExplicitTemplateArgs()); 969 return *getTemplateKWAndArgsInfo(); 970 } 971 972 /// \brief Retrieve the explicit template argument list that followed the 973 /// member template name. 974 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 975 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 976 } 977 978 /// \brief Retrieves the optional explicit template arguments. 979 /// This points to the same data as getExplicitTemplateArgs(), but 980 /// returns null if there are no explicit template arguments. 981 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 982 if (!hasExplicitTemplateArgs()) return 0; 983 return &getExplicitTemplateArgs(); 984 } 985 986 /// \brief Copies the template arguments (if present) into the given 987 /// structure. 988 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 989 if (hasExplicitTemplateArgs()) 990 getExplicitTemplateArgs().copyInto(List); 991 } 992 993 /// \brief Retrieve the template arguments provided as part of this 994 /// template-id. 995 const TemplateArgumentLoc *getTemplateArgs() const { 996 if (!hasExplicitTemplateArgs()) 997 return 0; 998 999 return getExplicitTemplateArgs().getTemplateArgs(); 1000 } 1001 1002 /// \brief Retrieve the number of template arguments provided as part of this 1003 /// template-id. 1004 unsigned getNumTemplateArgs() const { 1005 if (!hasExplicitTemplateArgs()) 1006 return 0; 1007 1008 return getExplicitTemplateArgs().NumTemplateArgs; 1009 } 1010 1011 /// \brief Returns true if this expression refers to a function that 1012 /// was resolved from an overloaded set having size greater than 1. 1013 bool hadMultipleCandidates() const { 1014 return DeclRefExprBits.HadMultipleCandidates; 1015 } 1016 /// \brief Sets the flag telling whether this expression refers to 1017 /// a function that was resolved from an overloaded set having size 1018 /// greater than 1. 1019 void setHadMultipleCandidates(bool V = true) { 1020 DeclRefExprBits.HadMultipleCandidates = V; 1021 } 1022 1023 static bool classof(const Stmt *T) { 1024 return T->getStmtClass() == DeclRefExprClass; 1025 } 1026 static bool classof(const DeclRefExpr *) { return true; } 1027 1028 // Iterators 1029 child_range children() { return child_range(); } 1030 1031 friend class ASTStmtReader; 1032 friend class ASTStmtWriter; 1033}; 1034 1035/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 1036class PredefinedExpr : public Expr { 1037public: 1038 enum IdentType { 1039 Func, 1040 Function, 1041 PrettyFunction, 1042 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 1043 /// 'virtual' keyword is omitted for virtual member functions. 1044 PrettyFunctionNoVirtual 1045 }; 1046 1047private: 1048 SourceLocation Loc; 1049 IdentType Type; 1050public: 1051 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 1052 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 1053 type->isDependentType(), type->isDependentType(), 1054 type->isInstantiationDependentType(), 1055 /*ContainsUnexpandedParameterPack=*/false), 1056 Loc(l), Type(IT) {} 1057 1058 /// \brief Construct an empty predefined expression. 1059 explicit PredefinedExpr(EmptyShell Empty) 1060 : Expr(PredefinedExprClass, Empty) { } 1061 1062 IdentType getIdentType() const { return Type; } 1063 void setIdentType(IdentType IT) { Type = IT; } 1064 1065 SourceLocation getLocation() const { return Loc; } 1066 void setLocation(SourceLocation L) { Loc = L; } 1067 1068 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1069 1070 SourceRange getSourceRange() const { return SourceRange(Loc); } 1071 1072 static bool classof(const Stmt *T) { 1073 return T->getStmtClass() == PredefinedExprClass; 1074 } 1075 static bool classof(const PredefinedExpr *) { return true; } 1076 1077 // Iterators 1078 child_range children() { return child_range(); } 1079}; 1080 1081/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1082/// leaking memory. 1083/// 1084/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1085/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1086/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1087/// the APFloat/APInt values will never get freed. APNumericStorage uses 1088/// ASTContext's allocator for memory allocation. 1089class APNumericStorage { 1090 union { 1091 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1092 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1093 }; 1094 unsigned BitWidth; 1095 1096 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1097 1098 APNumericStorage(const APNumericStorage&); // do not implement 1099 APNumericStorage& operator=(const APNumericStorage&); // do not implement 1100 1101protected: 1102 APNumericStorage() : VAL(0), BitWidth(0) { } 1103 1104 llvm::APInt getIntValue() const { 1105 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1106 if (NumWords > 1) 1107 return llvm::APInt(BitWidth, NumWords, pVal); 1108 else 1109 return llvm::APInt(BitWidth, VAL); 1110 } 1111 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1112}; 1113 1114class APIntStorage : private APNumericStorage { 1115public: 1116 llvm::APInt getValue() const { return getIntValue(); } 1117 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1118}; 1119 1120class APFloatStorage : private APNumericStorage { 1121public: 1122 llvm::APFloat getValue(bool IsIEEE) const { 1123 return llvm::APFloat(getIntValue(), IsIEEE); 1124 } 1125 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1126 setIntValue(C, Val.bitcastToAPInt()); 1127 } 1128}; 1129 1130class IntegerLiteral : public Expr, public APIntStorage { 1131 SourceLocation Loc; 1132 1133 /// \brief Construct an empty integer literal. 1134 explicit IntegerLiteral(EmptyShell Empty) 1135 : Expr(IntegerLiteralClass, Empty) { } 1136 1137public: 1138 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1139 // or UnsignedLongLongTy 1140 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 1141 QualType type, SourceLocation l) 1142 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1143 false, false), 1144 Loc(l) { 1145 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 1146 assert(V.getBitWidth() == C.getIntWidth(type) && 1147 "Integer type is not the correct size for constant."); 1148 setValue(C, V); 1149 } 1150 1151 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1152 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1153 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1154 /// \param V - the value that the returned integer literal contains. 1155 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1156 QualType type, SourceLocation l); 1157 /// \brief Returns a new empty integer literal. 1158 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1159 1160 SourceRange getSourceRange() const { return SourceRange(Loc); } 1161 1162 /// \brief Retrieve the location of the literal. 1163 SourceLocation getLocation() const { return Loc; } 1164 1165 void setLocation(SourceLocation Location) { Loc = Location; } 1166 1167 static bool classof(const Stmt *T) { 1168 return T->getStmtClass() == IntegerLiteralClass; 1169 } 1170 static bool classof(const IntegerLiteral *) { return true; } 1171 1172 // Iterators 1173 child_range children() { return child_range(); } 1174}; 1175 1176class CharacterLiteral : public Expr { 1177public: 1178 enum CharacterKind { 1179 Ascii, 1180 Wide, 1181 UTF16, 1182 UTF32 1183 }; 1184 1185private: 1186 unsigned Value; 1187 SourceLocation Loc; 1188public: 1189 // type should be IntTy 1190 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1191 SourceLocation l) 1192 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1193 false, false), 1194 Value(value), Loc(l) { 1195 CharacterLiteralBits.Kind = kind; 1196 } 1197 1198 /// \brief Construct an empty character literal. 1199 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1200 1201 SourceLocation getLocation() const { return Loc; } 1202 CharacterKind getKind() const { 1203 return static_cast<CharacterKind>(CharacterLiteralBits.Kind); 1204 } 1205 1206 SourceRange getSourceRange() const { return SourceRange(Loc); } 1207 1208 unsigned getValue() const { return Value; } 1209 1210 void setLocation(SourceLocation Location) { Loc = Location; } 1211 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; } 1212 void setValue(unsigned Val) { Value = Val; } 1213 1214 static bool classof(const Stmt *T) { 1215 return T->getStmtClass() == CharacterLiteralClass; 1216 } 1217 static bool classof(const CharacterLiteral *) { return true; } 1218 1219 // Iterators 1220 child_range children() { return child_range(); } 1221}; 1222 1223class FloatingLiteral : public Expr, private APFloatStorage { 1224 SourceLocation Loc; 1225 1226 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1227 QualType Type, SourceLocation L) 1228 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1229 false, false), Loc(L) { 1230 FloatingLiteralBits.IsIEEE = 1231 &C.getTargetInfo().getLongDoubleFormat() == &llvm::APFloat::IEEEquad; 1232 FloatingLiteralBits.IsExact = isexact; 1233 setValue(C, V); 1234 } 1235 1236 /// \brief Construct an empty floating-point literal. 1237 explicit FloatingLiteral(ASTContext &C, EmptyShell Empty) 1238 : Expr(FloatingLiteralClass, Empty) { 1239 FloatingLiteralBits.IsIEEE = 1240 &C.getTargetInfo().getLongDoubleFormat() == &llvm::APFloat::IEEEquad; 1241 FloatingLiteralBits.IsExact = false; 1242 } 1243 1244public: 1245 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1246 bool isexact, QualType Type, SourceLocation L); 1247 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1248 1249 llvm::APFloat getValue() const { 1250 return APFloatStorage::getValue(FloatingLiteralBits.IsIEEE); 1251 } 1252 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1253 APFloatStorage::setValue(C, Val); 1254 } 1255 1256 bool isExact() const { return FloatingLiteralBits.IsExact; } 1257 void setExact(bool E) { FloatingLiteralBits.IsExact = E; } 1258 1259 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1260 /// double. Note that this may cause loss of precision, but is useful for 1261 /// debugging dumps, etc. 1262 double getValueAsApproximateDouble() const; 1263 1264 SourceLocation getLocation() const { return Loc; } 1265 void setLocation(SourceLocation L) { Loc = L; } 1266 1267 SourceRange getSourceRange() const { return SourceRange(Loc); } 1268 1269 static bool classof(const Stmt *T) { 1270 return T->getStmtClass() == FloatingLiteralClass; 1271 } 1272 static bool classof(const FloatingLiteral *) { return true; } 1273 1274 // Iterators 1275 child_range children() { return child_range(); } 1276}; 1277 1278/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1279/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1280/// IntegerLiteral classes. Instances of this class always have a Complex type 1281/// whose element type matches the subexpression. 1282/// 1283class ImaginaryLiteral : public Expr { 1284 Stmt *Val; 1285public: 1286 ImaginaryLiteral(Expr *val, QualType Ty) 1287 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1288 false, false), 1289 Val(val) {} 1290 1291 /// \brief Build an empty imaginary literal. 1292 explicit ImaginaryLiteral(EmptyShell Empty) 1293 : Expr(ImaginaryLiteralClass, Empty) { } 1294 1295 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1296 Expr *getSubExpr() { return cast<Expr>(Val); } 1297 void setSubExpr(Expr *E) { Val = E; } 1298 1299 SourceRange getSourceRange() const { return Val->getSourceRange(); } 1300 static bool classof(const Stmt *T) { 1301 return T->getStmtClass() == ImaginaryLiteralClass; 1302 } 1303 static bool classof(const ImaginaryLiteral *) { return true; } 1304 1305 // Iterators 1306 child_range children() { return child_range(&Val, &Val+1); } 1307}; 1308 1309/// StringLiteral - This represents a string literal expression, e.g. "foo" 1310/// or L"bar" (wide strings). The actual string is returned by getStrData() 1311/// is NOT null-terminated, and the length of the string is determined by 1312/// calling getByteLength(). The C type for a string is always a 1313/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1314/// not. 1315/// 1316/// Note that strings in C can be formed by concatenation of multiple string 1317/// literal pptokens in translation phase #6. This keeps track of the locations 1318/// of each of these pieces. 1319/// 1320/// Strings in C can also be truncated and extended by assigning into arrays, 1321/// e.g. with constructs like: 1322/// char X[2] = "foobar"; 1323/// In this case, getByteLength() will return 6, but the string literal will 1324/// have type "char[2]". 1325class StringLiteral : public Expr { 1326public: 1327 enum StringKind { 1328 Ascii, 1329 Wide, 1330 UTF8, 1331 UTF16, 1332 UTF32 1333 }; 1334 1335private: 1336 friend class ASTStmtReader; 1337 1338 union { 1339 const char *asChar; 1340 const uint16_t *asUInt16; 1341 const uint32_t *asUInt32; 1342 } StrData; 1343 unsigned Length; 1344 unsigned CharByteWidth : 4; 1345 unsigned Kind : 3; 1346 unsigned IsPascal : 1; 1347 unsigned NumConcatenated; 1348 SourceLocation TokLocs[1]; 1349 1350 StringLiteral(QualType Ty) : 1351 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1352 false) {} 1353 1354 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1355 1356public: 1357 /// This is the "fully general" constructor that allows representation of 1358 /// strings formed from multiple concatenated tokens. 1359 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1360 bool Pascal, QualType Ty, 1361 const SourceLocation *Loc, unsigned NumStrs); 1362 1363 /// Simple constructor for string literals made from one token. 1364 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1365 bool Pascal, QualType Ty, 1366 SourceLocation Loc) { 1367 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1368 } 1369 1370 /// \brief Construct an empty string literal. 1371 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1372 1373 StringRef getString() const { 1374 assert(CharByteWidth==1 1375 && "This function is used in places that assume strings use char"); 1376 return StringRef(StrData.asChar, getByteLength()); 1377 } 1378 1379 /// Allow clients that need the byte representation, such as ASTWriterStmt 1380 /// ::VisitStringLiteral(), access. 1381 StringRef getBytes() const { 1382 // FIXME: StringRef may not be the right type to use as a result for this. 1383 if (CharByteWidth == 1) 1384 return StringRef(StrData.asChar, getByteLength()); 1385 if (CharByteWidth == 4) 1386 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1387 getByteLength()); 1388 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1389 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1390 getByteLength()); 1391 } 1392 1393 uint32_t getCodeUnit(size_t i) const { 1394 assert(i < Length && "out of bounds access"); 1395 if (CharByteWidth == 1) 1396 return static_cast<unsigned char>(StrData.asChar[i]); 1397 if (CharByteWidth == 4) 1398 return StrData.asUInt32[i]; 1399 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1400 return StrData.asUInt16[i]; 1401 } 1402 1403 unsigned getByteLength() const { return CharByteWidth*Length; } 1404 unsigned getLength() const { return Length; } 1405 unsigned getCharByteWidth() const { return CharByteWidth; } 1406 1407 /// \brief Sets the string data to the given string data. 1408 void setString(ASTContext &C, StringRef Str, 1409 StringKind Kind, bool IsPascal); 1410 1411 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1412 1413 1414 bool isAscii() const { return Kind == Ascii; } 1415 bool isWide() const { return Kind == Wide; } 1416 bool isUTF8() const { return Kind == UTF8; } 1417 bool isUTF16() const { return Kind == UTF16; } 1418 bool isUTF32() const { return Kind == UTF32; } 1419 bool isPascal() const { return IsPascal; } 1420 1421 bool containsNonAsciiOrNull() const { 1422 StringRef Str = getString(); 1423 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1424 if (!isascii(Str[i]) || !Str[i]) 1425 return true; 1426 return false; 1427 } 1428 1429 /// getNumConcatenated - Get the number of string literal tokens that were 1430 /// concatenated in translation phase #6 to form this string literal. 1431 unsigned getNumConcatenated() const { return NumConcatenated; } 1432 1433 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1434 assert(TokNum < NumConcatenated && "Invalid tok number"); 1435 return TokLocs[TokNum]; 1436 } 1437 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1438 assert(TokNum < NumConcatenated && "Invalid tok number"); 1439 TokLocs[TokNum] = L; 1440 } 1441 1442 /// getLocationOfByte - Return a source location that points to the specified 1443 /// byte of this string literal. 1444 /// 1445 /// Strings are amazingly complex. They can be formed from multiple tokens 1446 /// and can have escape sequences in them in addition to the usual trigraph 1447 /// and escaped newline business. This routine handles this complexity. 1448 /// 1449 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1450 const LangOptions &Features, 1451 const TargetInfo &Target) const; 1452 1453 typedef const SourceLocation *tokloc_iterator; 1454 tokloc_iterator tokloc_begin() const { return TokLocs; } 1455 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1456 1457 SourceRange getSourceRange() const { 1458 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1459 } 1460 static bool classof(const Stmt *T) { 1461 return T->getStmtClass() == StringLiteralClass; 1462 } 1463 static bool classof(const StringLiteral *) { return true; } 1464 1465 // Iterators 1466 child_range children() { return child_range(); } 1467}; 1468 1469/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1470/// AST node is only formed if full location information is requested. 1471class ParenExpr : public Expr { 1472 SourceLocation L, R; 1473 Stmt *Val; 1474public: 1475 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1476 : Expr(ParenExprClass, val->getType(), 1477 val->getValueKind(), val->getObjectKind(), 1478 val->isTypeDependent(), val->isValueDependent(), 1479 val->isInstantiationDependent(), 1480 val->containsUnexpandedParameterPack()), 1481 L(l), R(r), Val(val) {} 1482 1483 /// \brief Construct an empty parenthesized expression. 1484 explicit ParenExpr(EmptyShell Empty) 1485 : Expr(ParenExprClass, Empty) { } 1486 1487 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1488 Expr *getSubExpr() { return cast<Expr>(Val); } 1489 void setSubExpr(Expr *E) { Val = E; } 1490 1491 SourceRange getSourceRange() const { return SourceRange(L, R); } 1492 1493 /// \brief Get the location of the left parentheses '('. 1494 SourceLocation getLParen() const { return L; } 1495 void setLParen(SourceLocation Loc) { L = Loc; } 1496 1497 /// \brief Get the location of the right parentheses ')'. 1498 SourceLocation getRParen() const { return R; } 1499 void setRParen(SourceLocation Loc) { R = Loc; } 1500 1501 static bool classof(const Stmt *T) { 1502 return T->getStmtClass() == ParenExprClass; 1503 } 1504 static bool classof(const ParenExpr *) { return true; } 1505 1506 // Iterators 1507 child_range children() { return child_range(&Val, &Val+1); } 1508}; 1509 1510 1511/// UnaryOperator - This represents the unary-expression's (except sizeof and 1512/// alignof), the postinc/postdec operators from postfix-expression, and various 1513/// extensions. 1514/// 1515/// Notes on various nodes: 1516/// 1517/// Real/Imag - These return the real/imag part of a complex operand. If 1518/// applied to a non-complex value, the former returns its operand and the 1519/// later returns zero in the type of the operand. 1520/// 1521class UnaryOperator : public Expr { 1522public: 1523 typedef UnaryOperatorKind Opcode; 1524 1525private: 1526 unsigned Opc : 5; 1527 SourceLocation Loc; 1528 Stmt *Val; 1529public: 1530 1531 UnaryOperator(Expr *input, Opcode opc, QualType type, 1532 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1533 : Expr(UnaryOperatorClass, type, VK, OK, 1534 input->isTypeDependent() || type->isDependentType(), 1535 input->isValueDependent(), 1536 (input->isInstantiationDependent() || 1537 type->isInstantiationDependentType()), 1538 input->containsUnexpandedParameterPack()), 1539 Opc(opc), Loc(l), Val(input) {} 1540 1541 /// \brief Build an empty unary operator. 1542 explicit UnaryOperator(EmptyShell Empty) 1543 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1544 1545 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1546 void setOpcode(Opcode O) { Opc = O; } 1547 1548 Expr *getSubExpr() const { return cast<Expr>(Val); } 1549 void setSubExpr(Expr *E) { Val = E; } 1550 1551 /// getOperatorLoc - Return the location of the operator. 1552 SourceLocation getOperatorLoc() const { return Loc; } 1553 void setOperatorLoc(SourceLocation L) { Loc = L; } 1554 1555 /// isPostfix - Return true if this is a postfix operation, like x++. 1556 static bool isPostfix(Opcode Op) { 1557 return Op == UO_PostInc || Op == UO_PostDec; 1558 } 1559 1560 /// isPrefix - Return true if this is a prefix operation, like --x. 1561 static bool isPrefix(Opcode Op) { 1562 return Op == UO_PreInc || Op == UO_PreDec; 1563 } 1564 1565 bool isPrefix() const { return isPrefix(getOpcode()); } 1566 bool isPostfix() const { return isPostfix(getOpcode()); } 1567 1568 static bool isIncrementOp(Opcode Op) { 1569 return Op == UO_PreInc || Op == UO_PostInc; 1570 } 1571 bool isIncrementOp() const { 1572 return isIncrementOp(getOpcode()); 1573 } 1574 1575 static bool isDecrementOp(Opcode Op) { 1576 return Op == UO_PreDec || Op == UO_PostDec; 1577 } 1578 bool isDecrementOp() const { 1579 return isDecrementOp(getOpcode()); 1580 } 1581 1582 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1583 bool isIncrementDecrementOp() const { 1584 return isIncrementDecrementOp(getOpcode()); 1585 } 1586 1587 static bool isArithmeticOp(Opcode Op) { 1588 return Op >= UO_Plus && Op <= UO_LNot; 1589 } 1590 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1591 1592 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1593 /// corresponds to, e.g. "sizeof" or "[pre]++" 1594 static const char *getOpcodeStr(Opcode Op); 1595 1596 /// \brief Retrieve the unary opcode that corresponds to the given 1597 /// overloaded operator. 1598 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1599 1600 /// \brief Retrieve the overloaded operator kind that corresponds to 1601 /// the given unary opcode. 1602 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1603 1604 SourceRange getSourceRange() const { 1605 if (isPostfix()) 1606 return SourceRange(Val->getLocStart(), Loc); 1607 else 1608 return SourceRange(Loc, Val->getLocEnd()); 1609 } 1610 SourceLocation getExprLoc() const { return Loc; } 1611 1612 static bool classof(const Stmt *T) { 1613 return T->getStmtClass() == UnaryOperatorClass; 1614 } 1615 static bool classof(const UnaryOperator *) { return true; } 1616 1617 // Iterators 1618 child_range children() { return child_range(&Val, &Val+1); } 1619}; 1620 1621/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1622/// offsetof(record-type, member-designator). For example, given: 1623/// @code 1624/// struct S { 1625/// float f; 1626/// double d; 1627/// }; 1628/// struct T { 1629/// int i; 1630/// struct S s[10]; 1631/// }; 1632/// @endcode 1633/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1634 1635class OffsetOfExpr : public Expr { 1636public: 1637 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1638 class OffsetOfNode { 1639 public: 1640 /// \brief The kind of offsetof node we have. 1641 enum Kind { 1642 /// \brief An index into an array. 1643 Array = 0x00, 1644 /// \brief A field. 1645 Field = 0x01, 1646 /// \brief A field in a dependent type, known only by its name. 1647 Identifier = 0x02, 1648 /// \brief An implicit indirection through a C++ base class, when the 1649 /// field found is in a base class. 1650 Base = 0x03 1651 }; 1652 1653 private: 1654 enum { MaskBits = 2, Mask = 0x03 }; 1655 1656 /// \brief The source range that covers this part of the designator. 1657 SourceRange Range; 1658 1659 /// \brief The data describing the designator, which comes in three 1660 /// different forms, depending on the lower two bits. 1661 /// - An unsigned index into the array of Expr*'s stored after this node 1662 /// in memory, for [constant-expression] designators. 1663 /// - A FieldDecl*, for references to a known field. 1664 /// - An IdentifierInfo*, for references to a field with a given name 1665 /// when the class type is dependent. 1666 /// - A CXXBaseSpecifier*, for references that look at a field in a 1667 /// base class. 1668 uintptr_t Data; 1669 1670 public: 1671 /// \brief Create an offsetof node that refers to an array element. 1672 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1673 SourceLocation RBracketLoc) 1674 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1675 1676 /// \brief Create an offsetof node that refers to a field. 1677 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1678 SourceLocation NameLoc) 1679 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1680 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1681 1682 /// \brief Create an offsetof node that refers to an identifier. 1683 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1684 SourceLocation NameLoc) 1685 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1686 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1687 1688 /// \brief Create an offsetof node that refers into a C++ base class. 1689 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1690 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1691 1692 /// \brief Determine what kind of offsetof node this is. 1693 Kind getKind() const { 1694 return static_cast<Kind>(Data & Mask); 1695 } 1696 1697 /// \brief For an array element node, returns the index into the array 1698 /// of expressions. 1699 unsigned getArrayExprIndex() const { 1700 assert(getKind() == Array); 1701 return Data >> 2; 1702 } 1703 1704 /// \brief For a field offsetof node, returns the field. 1705 FieldDecl *getField() const { 1706 assert(getKind() == Field); 1707 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1708 } 1709 1710 /// \brief For a field or identifier offsetof node, returns the name of 1711 /// the field. 1712 IdentifierInfo *getFieldName() const; 1713 1714 /// \brief For a base class node, returns the base specifier. 1715 CXXBaseSpecifier *getBase() const { 1716 assert(getKind() == Base); 1717 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1718 } 1719 1720 /// \brief Retrieve the source range that covers this offsetof node. 1721 /// 1722 /// For an array element node, the source range contains the locations of 1723 /// the square brackets. For a field or identifier node, the source range 1724 /// contains the location of the period (if there is one) and the 1725 /// identifier. 1726 SourceRange getSourceRange() const { return Range; } 1727 }; 1728 1729private: 1730 1731 SourceLocation OperatorLoc, RParenLoc; 1732 // Base type; 1733 TypeSourceInfo *TSInfo; 1734 // Number of sub-components (i.e. instances of OffsetOfNode). 1735 unsigned NumComps; 1736 // Number of sub-expressions (i.e. array subscript expressions). 1737 unsigned NumExprs; 1738 1739 OffsetOfExpr(ASTContext &C, QualType type, 1740 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1741 OffsetOfNode* compsPtr, unsigned numComps, 1742 Expr** exprsPtr, unsigned numExprs, 1743 SourceLocation RParenLoc); 1744 1745 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1746 : Expr(OffsetOfExprClass, EmptyShell()), 1747 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1748 1749public: 1750 1751 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1752 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1753 OffsetOfNode* compsPtr, unsigned numComps, 1754 Expr** exprsPtr, unsigned numExprs, 1755 SourceLocation RParenLoc); 1756 1757 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1758 unsigned NumComps, unsigned NumExprs); 1759 1760 /// getOperatorLoc - Return the location of the operator. 1761 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1762 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1763 1764 /// \brief Return the location of the right parentheses. 1765 SourceLocation getRParenLoc() const { return RParenLoc; } 1766 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1767 1768 TypeSourceInfo *getTypeSourceInfo() const { 1769 return TSInfo; 1770 } 1771 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1772 TSInfo = tsi; 1773 } 1774 1775 const OffsetOfNode &getComponent(unsigned Idx) const { 1776 assert(Idx < NumComps && "Subscript out of range"); 1777 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1778 } 1779 1780 void setComponent(unsigned Idx, OffsetOfNode ON) { 1781 assert(Idx < NumComps && "Subscript out of range"); 1782 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1783 } 1784 1785 unsigned getNumComponents() const { 1786 return NumComps; 1787 } 1788 1789 Expr* getIndexExpr(unsigned Idx) { 1790 assert(Idx < NumExprs && "Subscript out of range"); 1791 return reinterpret_cast<Expr **>( 1792 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1793 } 1794 const Expr *getIndexExpr(unsigned Idx) const { 1795 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1796 } 1797 1798 void setIndexExpr(unsigned Idx, Expr* E) { 1799 assert(Idx < NumComps && "Subscript out of range"); 1800 reinterpret_cast<Expr **>( 1801 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1802 } 1803 1804 unsigned getNumExpressions() const { 1805 return NumExprs; 1806 } 1807 1808 SourceRange getSourceRange() const { 1809 return SourceRange(OperatorLoc, RParenLoc); 1810 } 1811 1812 static bool classof(const Stmt *T) { 1813 return T->getStmtClass() == OffsetOfExprClass; 1814 } 1815 1816 static bool classof(const OffsetOfExpr *) { return true; } 1817 1818 // Iterators 1819 child_range children() { 1820 Stmt **begin = 1821 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1822 + NumComps); 1823 return child_range(begin, begin + NumExprs); 1824 } 1825}; 1826 1827/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1828/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1829/// vec_step (OpenCL 1.1 6.11.12). 1830class UnaryExprOrTypeTraitExpr : public Expr { 1831 union { 1832 TypeSourceInfo *Ty; 1833 Stmt *Ex; 1834 } Argument; 1835 SourceLocation OpLoc, RParenLoc; 1836 1837public: 1838 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1839 QualType resultType, SourceLocation op, 1840 SourceLocation rp) : 1841 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1842 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1843 // Value-dependent if the argument is type-dependent. 1844 TInfo->getType()->isDependentType(), 1845 TInfo->getType()->isInstantiationDependentType(), 1846 TInfo->getType()->containsUnexpandedParameterPack()), 1847 OpLoc(op), RParenLoc(rp) { 1848 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1849 UnaryExprOrTypeTraitExprBits.IsType = true; 1850 Argument.Ty = TInfo; 1851 } 1852 1853 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1854 QualType resultType, SourceLocation op, 1855 SourceLocation rp) : 1856 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1857 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1858 // Value-dependent if the argument is type-dependent. 1859 E->isTypeDependent(), 1860 E->isInstantiationDependent(), 1861 E->containsUnexpandedParameterPack()), 1862 OpLoc(op), RParenLoc(rp) { 1863 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1864 UnaryExprOrTypeTraitExprBits.IsType = false; 1865 Argument.Ex = E; 1866 } 1867 1868 /// \brief Construct an empty sizeof/alignof expression. 1869 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1870 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1871 1872 UnaryExprOrTypeTrait getKind() const { 1873 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind); 1874 } 1875 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;} 1876 1877 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; } 1878 QualType getArgumentType() const { 1879 return getArgumentTypeInfo()->getType(); 1880 } 1881 TypeSourceInfo *getArgumentTypeInfo() const { 1882 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1883 return Argument.Ty; 1884 } 1885 Expr *getArgumentExpr() { 1886 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1887 return static_cast<Expr*>(Argument.Ex); 1888 } 1889 const Expr *getArgumentExpr() const { 1890 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1891 } 1892 1893 void setArgument(Expr *E) { 1894 Argument.Ex = E; 1895 UnaryExprOrTypeTraitExprBits.IsType = false; 1896 } 1897 void setArgument(TypeSourceInfo *TInfo) { 1898 Argument.Ty = TInfo; 1899 UnaryExprOrTypeTraitExprBits.IsType = true; 1900 } 1901 1902 /// Gets the argument type, or the type of the argument expression, whichever 1903 /// is appropriate. 1904 QualType getTypeOfArgument() const { 1905 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1906 } 1907 1908 SourceLocation getOperatorLoc() const { return OpLoc; } 1909 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1910 1911 SourceLocation getRParenLoc() const { return RParenLoc; } 1912 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1913 1914 SourceRange getSourceRange() const { 1915 return SourceRange(OpLoc, RParenLoc); 1916 } 1917 1918 static bool classof(const Stmt *T) { 1919 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1920 } 1921 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1922 1923 // Iterators 1924 child_range children(); 1925}; 1926 1927//===----------------------------------------------------------------------===// 1928// Postfix Operators. 1929//===----------------------------------------------------------------------===// 1930 1931/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1932class ArraySubscriptExpr : public Expr { 1933 enum { LHS, RHS, END_EXPR=2 }; 1934 Stmt* SubExprs[END_EXPR]; 1935 SourceLocation RBracketLoc; 1936public: 1937 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1938 ExprValueKind VK, ExprObjectKind OK, 1939 SourceLocation rbracketloc) 1940 : Expr(ArraySubscriptExprClass, t, VK, OK, 1941 lhs->isTypeDependent() || rhs->isTypeDependent(), 1942 lhs->isValueDependent() || rhs->isValueDependent(), 1943 (lhs->isInstantiationDependent() || 1944 rhs->isInstantiationDependent()), 1945 (lhs->containsUnexpandedParameterPack() || 1946 rhs->containsUnexpandedParameterPack())), 1947 RBracketLoc(rbracketloc) { 1948 SubExprs[LHS] = lhs; 1949 SubExprs[RHS] = rhs; 1950 } 1951 1952 /// \brief Create an empty array subscript expression. 1953 explicit ArraySubscriptExpr(EmptyShell Shell) 1954 : Expr(ArraySubscriptExprClass, Shell) { } 1955 1956 /// An array access can be written A[4] or 4[A] (both are equivalent). 1957 /// - getBase() and getIdx() always present the normalized view: A[4]. 1958 /// In this case getBase() returns "A" and getIdx() returns "4". 1959 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1960 /// 4[A] getLHS() returns "4". 1961 /// Note: Because vector element access is also written A[4] we must 1962 /// predicate the format conversion in getBase and getIdx only on the 1963 /// the type of the RHS, as it is possible for the LHS to be a vector of 1964 /// integer type 1965 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1966 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1967 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1968 1969 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1970 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1971 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1972 1973 Expr *getBase() { 1974 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1975 } 1976 1977 const Expr *getBase() const { 1978 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1979 } 1980 1981 Expr *getIdx() { 1982 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1983 } 1984 1985 const Expr *getIdx() const { 1986 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1987 } 1988 1989 SourceRange getSourceRange() const { 1990 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1991 } 1992 1993 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1994 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1995 1996 SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1997 1998 static bool classof(const Stmt *T) { 1999 return T->getStmtClass() == ArraySubscriptExprClass; 2000 } 2001 static bool classof(const ArraySubscriptExpr *) { return true; } 2002 2003 // Iterators 2004 child_range children() { 2005 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2006 } 2007}; 2008 2009 2010/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 2011/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 2012/// while its subclasses may represent alternative syntax that (semantically) 2013/// results in a function call. For example, CXXOperatorCallExpr is 2014/// a subclass for overloaded operator calls that use operator syntax, e.g., 2015/// "str1 + str2" to resolve to a function call. 2016class CallExpr : public Expr { 2017 enum { FN=0, PREARGS_START=1 }; 2018 Stmt **SubExprs; 2019 unsigned NumArgs; 2020 SourceLocation RParenLoc; 2021 2022protected: 2023 // These versions of the constructor are for derived classes. 2024 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 2025 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 2026 SourceLocation rparenloc); 2027 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 2028 2029 Stmt *getPreArg(unsigned i) { 2030 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2031 return SubExprs[PREARGS_START+i]; 2032 } 2033 const Stmt *getPreArg(unsigned i) const { 2034 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2035 return SubExprs[PREARGS_START+i]; 2036 } 2037 void setPreArg(unsigned i, Stmt *PreArg) { 2038 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2039 SubExprs[PREARGS_START+i] = PreArg; 2040 } 2041 2042 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2043 2044public: 2045 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 2046 ExprValueKind VK, SourceLocation rparenloc); 2047 2048 /// \brief Build an empty call expression. 2049 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 2050 2051 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2052 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2053 void setCallee(Expr *F) { SubExprs[FN] = F; } 2054 2055 Decl *getCalleeDecl(); 2056 const Decl *getCalleeDecl() const { 2057 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2058 } 2059 2060 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2061 FunctionDecl *getDirectCallee(); 2062 const FunctionDecl *getDirectCallee() const { 2063 return const_cast<CallExpr*>(this)->getDirectCallee(); 2064 } 2065 2066 /// getNumArgs - Return the number of actual arguments to this call. 2067 /// 2068 unsigned getNumArgs() const { return NumArgs; } 2069 2070 /// \brief Retrieve the call arguments. 2071 Expr **getArgs() { 2072 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2073 } 2074 const Expr *const *getArgs() const { 2075 return const_cast<CallExpr*>(this)->getArgs(); 2076 } 2077 2078 /// getArg - Return the specified argument. 2079 Expr *getArg(unsigned Arg) { 2080 assert(Arg < NumArgs && "Arg access out of range!"); 2081 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2082 } 2083 const Expr *getArg(unsigned Arg) const { 2084 assert(Arg < NumArgs && "Arg access out of range!"); 2085 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2086 } 2087 2088 /// setArg - Set the specified argument. 2089 void setArg(unsigned Arg, Expr *ArgExpr) { 2090 assert(Arg < NumArgs && "Arg access out of range!"); 2091 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2092 } 2093 2094 /// setNumArgs - This changes the number of arguments present in this call. 2095 /// Any orphaned expressions are deleted by this, and any new operands are set 2096 /// to null. 2097 void setNumArgs(ASTContext& C, unsigned NumArgs); 2098 2099 typedef ExprIterator arg_iterator; 2100 typedef ConstExprIterator const_arg_iterator; 2101 2102 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2103 arg_iterator arg_end() { 2104 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2105 } 2106 const_arg_iterator arg_begin() const { 2107 return SubExprs+PREARGS_START+getNumPreArgs(); 2108 } 2109 const_arg_iterator arg_end() const { 2110 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2111 } 2112 2113 /// getNumCommas - Return the number of commas that must have been present in 2114 /// this function call. 2115 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2116 2117 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2118 /// not, return 0. 2119 unsigned isBuiltinCall() const; 2120 2121 /// getCallReturnType - Get the return type of the call expr. This is not 2122 /// always the type of the expr itself, if the return type is a reference 2123 /// type. 2124 QualType getCallReturnType() const; 2125 2126 SourceLocation getRParenLoc() const { return RParenLoc; } 2127 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2128 2129 SourceRange getSourceRange() const; 2130 SourceLocation getLocStart() const; 2131 SourceLocation getLocEnd() const; 2132 2133 static bool classof(const Stmt *T) { 2134 return T->getStmtClass() >= firstCallExprConstant && 2135 T->getStmtClass() <= lastCallExprConstant; 2136 } 2137 static bool classof(const CallExpr *) { return true; } 2138 2139 // Iterators 2140 child_range children() { 2141 return child_range(&SubExprs[0], 2142 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2143 } 2144}; 2145 2146/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2147/// 2148class MemberExpr : public Expr { 2149 /// Extra data stored in some member expressions. 2150 struct MemberNameQualifier { 2151 /// \brief The nested-name-specifier that qualifies the name, including 2152 /// source-location information. 2153 NestedNameSpecifierLoc QualifierLoc; 2154 2155 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2156 /// name qualifiers. 2157 DeclAccessPair FoundDecl; 2158 }; 2159 2160 /// Base - the expression for the base pointer or structure references. In 2161 /// X.F, this is "X". 2162 Stmt *Base; 2163 2164 /// MemberDecl - This is the decl being referenced by the field/member name. 2165 /// In X.F, this is the decl referenced by F. 2166 ValueDecl *MemberDecl; 2167 2168 /// MemberDNLoc - Provides source/type location info for the 2169 /// declaration name embedded in MemberDecl. 2170 DeclarationNameLoc MemberDNLoc; 2171 2172 /// MemberLoc - This is the location of the member name. 2173 SourceLocation MemberLoc; 2174 2175 /// IsArrow - True if this is "X->F", false if this is "X.F". 2176 bool IsArrow : 1; 2177 2178 /// \brief True if this member expression used a nested-name-specifier to 2179 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2180 /// declaration. When true, a MemberNameQualifier 2181 /// structure is allocated immediately after the MemberExpr. 2182 bool HasQualifierOrFoundDecl : 1; 2183 2184 /// \brief True if this member expression specified a template keyword 2185 /// and/or a template argument list explicitly, e.g., x->f<int>, 2186 /// x->template f, x->template f<int>. 2187 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2188 /// TemplateArguments (if any) are allocated immediately after 2189 /// the MemberExpr or, if the member expression also has a qualifier, 2190 /// after the MemberNameQualifier structure. 2191 bool HasTemplateKWAndArgsInfo : 1; 2192 2193 /// \brief True if this member expression refers to a method that 2194 /// was resolved from an overloaded set having size greater than 1. 2195 bool HadMultipleCandidates : 1; 2196 2197 /// \brief Retrieve the qualifier that preceded the member name, if any. 2198 MemberNameQualifier *getMemberQualifier() { 2199 assert(HasQualifierOrFoundDecl); 2200 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2201 } 2202 2203 /// \brief Retrieve the qualifier that preceded the member name, if any. 2204 const MemberNameQualifier *getMemberQualifier() const { 2205 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2206 } 2207 2208public: 2209 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2210 const DeclarationNameInfo &NameInfo, QualType ty, 2211 ExprValueKind VK, ExprObjectKind OK) 2212 : Expr(MemberExprClass, ty, VK, OK, 2213 base->isTypeDependent(), 2214 base->isValueDependent(), 2215 base->isInstantiationDependent(), 2216 base->containsUnexpandedParameterPack()), 2217 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()), 2218 MemberLoc(NameInfo.getLoc()), IsArrow(isarrow), 2219 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2220 HadMultipleCandidates(false) { 2221 assert(memberdecl->getDeclName() == NameInfo.getName()); 2222 } 2223 2224 // NOTE: this constructor should be used only when it is known that 2225 // the member name can not provide additional syntactic info 2226 // (i.e., source locations for C++ operator names or type source info 2227 // for constructors, destructors and conversion operators). 2228 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2229 SourceLocation l, QualType ty, 2230 ExprValueKind VK, ExprObjectKind OK) 2231 : Expr(MemberExprClass, ty, VK, OK, 2232 base->isTypeDependent(), base->isValueDependent(), 2233 base->isInstantiationDependent(), 2234 base->containsUnexpandedParameterPack()), 2235 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l), 2236 IsArrow(isarrow), 2237 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2238 HadMultipleCandidates(false) {} 2239 2240 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2241 NestedNameSpecifierLoc QualifierLoc, 2242 SourceLocation TemplateKWLoc, 2243 ValueDecl *memberdecl, DeclAccessPair founddecl, 2244 DeclarationNameInfo MemberNameInfo, 2245 const TemplateArgumentListInfo *targs, 2246 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2247 2248 void setBase(Expr *E) { Base = E; } 2249 Expr *getBase() const { return cast<Expr>(Base); } 2250 2251 /// \brief Retrieve the member declaration to which this expression refers. 2252 /// 2253 /// The returned declaration will either be a FieldDecl or (in C++) 2254 /// a CXXMethodDecl. 2255 ValueDecl *getMemberDecl() const { return MemberDecl; } 2256 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2257 2258 /// \brief Retrieves the declaration found by lookup. 2259 DeclAccessPair getFoundDecl() const { 2260 if (!HasQualifierOrFoundDecl) 2261 return DeclAccessPair::make(getMemberDecl(), 2262 getMemberDecl()->getAccess()); 2263 return getMemberQualifier()->FoundDecl; 2264 } 2265 2266 /// \brief Determines whether this member expression actually had 2267 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2268 /// x->Base::foo. 2269 bool hasQualifier() const { return getQualifier() != 0; } 2270 2271 /// \brief If the member name was qualified, retrieves the 2272 /// nested-name-specifier that precedes the member name. Otherwise, returns 2273 /// NULL. 2274 NestedNameSpecifier *getQualifier() const { 2275 if (!HasQualifierOrFoundDecl) 2276 return 0; 2277 2278 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2279 } 2280 2281 /// \brief If the member name was qualified, retrieves the 2282 /// nested-name-specifier that precedes the member name, with source-location 2283 /// information. 2284 NestedNameSpecifierLoc getQualifierLoc() const { 2285 if (!hasQualifier()) 2286 return NestedNameSpecifierLoc(); 2287 2288 return getMemberQualifier()->QualifierLoc; 2289 } 2290 2291 /// \brief Return the optional template keyword and arguments info. 2292 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 2293 if (!HasTemplateKWAndArgsInfo) 2294 return 0; 2295 2296 if (!HasQualifierOrFoundDecl) 2297 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 2298 2299 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 2300 getMemberQualifier() + 1); 2301 } 2302 2303 /// \brief Return the optional template keyword and arguments info. 2304 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 2305 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo(); 2306 } 2307 2308 /// \brief Retrieve the location of the template keyword preceding 2309 /// the member name, if any. 2310 SourceLocation getTemplateKeywordLoc() const { 2311 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2312 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 2313 } 2314 2315 /// \brief Retrieve the location of the left angle bracket starting the 2316 /// explicit template argument list following the member name, if any. 2317 SourceLocation getLAngleLoc() const { 2318 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2319 return getTemplateKWAndArgsInfo()->LAngleLoc; 2320 } 2321 2322 /// \brief Retrieve the location of the right angle bracket ending the 2323 /// explicit template argument list following the member name, if any. 2324 SourceLocation getRAngleLoc() const { 2325 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2326 return getTemplateKWAndArgsInfo()->RAngleLoc; 2327 } 2328 2329 /// Determines whether the member name was preceded by the template keyword. 2330 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2331 2332 /// \brief Determines whether the member name was followed by an 2333 /// explicit template argument list. 2334 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2335 2336 /// \brief Copies the template arguments (if present) into the given 2337 /// structure. 2338 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2339 if (hasExplicitTemplateArgs()) 2340 getExplicitTemplateArgs().copyInto(List); 2341 } 2342 2343 /// \brief Retrieve the explicit template argument list that 2344 /// follow the member template name. This must only be called on an 2345 /// expression with explicit template arguments. 2346 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2347 assert(hasExplicitTemplateArgs()); 2348 return *getTemplateKWAndArgsInfo(); 2349 } 2350 2351 /// \brief Retrieve the explicit template argument list that 2352 /// followed the member template name. This must only be called on 2353 /// an expression with explicit template arguments. 2354 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2355 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2356 } 2357 2358 /// \brief Retrieves the optional explicit template arguments. 2359 /// This points to the same data as getExplicitTemplateArgs(), but 2360 /// returns null if there are no explicit template arguments. 2361 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2362 if (!hasExplicitTemplateArgs()) return 0; 2363 return &getExplicitTemplateArgs(); 2364 } 2365 2366 /// \brief Retrieve the template arguments provided as part of this 2367 /// template-id. 2368 const TemplateArgumentLoc *getTemplateArgs() const { 2369 if (!hasExplicitTemplateArgs()) 2370 return 0; 2371 2372 return getExplicitTemplateArgs().getTemplateArgs(); 2373 } 2374 2375 /// \brief Retrieve the number of template arguments provided as part of this 2376 /// template-id. 2377 unsigned getNumTemplateArgs() const { 2378 if (!hasExplicitTemplateArgs()) 2379 return 0; 2380 2381 return getExplicitTemplateArgs().NumTemplateArgs; 2382 } 2383 2384 /// \brief Retrieve the member declaration name info. 2385 DeclarationNameInfo getMemberNameInfo() const { 2386 return DeclarationNameInfo(MemberDecl->getDeclName(), 2387 MemberLoc, MemberDNLoc); 2388 } 2389 2390 bool isArrow() const { return IsArrow; } 2391 void setArrow(bool A) { IsArrow = A; } 2392 2393 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2394 /// location of 'F'. 2395 SourceLocation getMemberLoc() const { return MemberLoc; } 2396 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2397 2398 SourceRange getSourceRange() const; 2399 SourceLocation getLocStart() const; 2400 SourceLocation getLocEnd() const; 2401 2402 SourceLocation getExprLoc() const { return MemberLoc; } 2403 2404 /// \brief Determine whether the base of this explicit is implicit. 2405 bool isImplicitAccess() const { 2406 return getBase() && getBase()->isImplicitCXXThis(); 2407 } 2408 2409 /// \brief Returns true if this member expression refers to a method that 2410 /// was resolved from an overloaded set having size greater than 1. 2411 bool hadMultipleCandidates() const { 2412 return HadMultipleCandidates; 2413 } 2414 /// \brief Sets the flag telling whether this expression refers to 2415 /// a method that was resolved from an overloaded set having size 2416 /// greater than 1. 2417 void setHadMultipleCandidates(bool V = true) { 2418 HadMultipleCandidates = V; 2419 } 2420 2421 static bool classof(const Stmt *T) { 2422 return T->getStmtClass() == MemberExprClass; 2423 } 2424 static bool classof(const MemberExpr *) { return true; } 2425 2426 // Iterators 2427 child_range children() { return child_range(&Base, &Base+1); } 2428 2429 friend class ASTReader; 2430 friend class ASTStmtWriter; 2431}; 2432 2433/// CompoundLiteralExpr - [C99 6.5.2.5] 2434/// 2435class CompoundLiteralExpr : public Expr { 2436 /// LParenLoc - If non-null, this is the location of the left paren in a 2437 /// compound literal like "(int){4}". This can be null if this is a 2438 /// synthesized compound expression. 2439 SourceLocation LParenLoc; 2440 2441 /// The type as written. This can be an incomplete array type, in 2442 /// which case the actual expression type will be different. 2443 /// The int part of the pair stores whether this expr is file scope. 2444 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope; 2445 Stmt *Init; 2446public: 2447 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2448 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2449 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2450 tinfo->getType()->isDependentType(), 2451 init->isValueDependent(), 2452 (init->isInstantiationDependent() || 2453 tinfo->getType()->isInstantiationDependentType()), 2454 init->containsUnexpandedParameterPack()), 2455 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {} 2456 2457 /// \brief Construct an empty compound literal. 2458 explicit CompoundLiteralExpr(EmptyShell Empty) 2459 : Expr(CompoundLiteralExprClass, Empty) { } 2460 2461 const Expr *getInitializer() const { return cast<Expr>(Init); } 2462 Expr *getInitializer() { return cast<Expr>(Init); } 2463 void setInitializer(Expr *E) { Init = E; } 2464 2465 bool isFileScope() const { return TInfoAndScope.getInt(); } 2466 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); } 2467 2468 SourceLocation getLParenLoc() const { return LParenLoc; } 2469 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2470 2471 TypeSourceInfo *getTypeSourceInfo() const { 2472 return TInfoAndScope.getPointer(); 2473 } 2474 void setTypeSourceInfo(TypeSourceInfo *tinfo) { 2475 TInfoAndScope.setPointer(tinfo); 2476 } 2477 2478 SourceRange getSourceRange() const { 2479 // FIXME: Init should never be null. 2480 if (!Init) 2481 return SourceRange(); 2482 if (LParenLoc.isInvalid()) 2483 return Init->getSourceRange(); 2484 return SourceRange(LParenLoc, Init->getLocEnd()); 2485 } 2486 2487 static bool classof(const Stmt *T) { 2488 return T->getStmtClass() == CompoundLiteralExprClass; 2489 } 2490 static bool classof(const CompoundLiteralExpr *) { return true; } 2491 2492 // Iterators 2493 child_range children() { return child_range(&Init, &Init+1); } 2494}; 2495 2496/// CastExpr - Base class for type casts, including both implicit 2497/// casts (ImplicitCastExpr) and explicit casts that have some 2498/// representation in the source code (ExplicitCastExpr's derived 2499/// classes). 2500class CastExpr : public Expr { 2501public: 2502 typedef clang::CastKind CastKind; 2503 2504private: 2505 Stmt *Op; 2506 2507 void CheckCastConsistency() const; 2508 2509 const CXXBaseSpecifier * const *path_buffer() const { 2510 return const_cast<CastExpr*>(this)->path_buffer(); 2511 } 2512 CXXBaseSpecifier **path_buffer(); 2513 2514 void setBasePathSize(unsigned basePathSize) { 2515 CastExprBits.BasePathSize = basePathSize; 2516 assert(CastExprBits.BasePathSize == basePathSize && 2517 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2518 } 2519 2520protected: 2521 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2522 const CastKind kind, Expr *op, unsigned BasePathSize) : 2523 Expr(SC, ty, VK, OK_Ordinary, 2524 // Cast expressions are type-dependent if the type is 2525 // dependent (C++ [temp.dep.expr]p3). 2526 ty->isDependentType(), 2527 // Cast expressions are value-dependent if the type is 2528 // dependent or if the subexpression is value-dependent. 2529 ty->isDependentType() || (op && op->isValueDependent()), 2530 (ty->isInstantiationDependentType() || 2531 (op && op->isInstantiationDependent())), 2532 (ty->containsUnexpandedParameterPack() || 2533 op->containsUnexpandedParameterPack())), 2534 Op(op) { 2535 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2536 CastExprBits.Kind = kind; 2537 setBasePathSize(BasePathSize); 2538#ifndef NDEBUG 2539 CheckCastConsistency(); 2540#endif 2541 } 2542 2543 /// \brief Construct an empty cast. 2544 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2545 : Expr(SC, Empty) { 2546 setBasePathSize(BasePathSize); 2547 } 2548 2549public: 2550 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2551 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2552 const char *getCastKindName() const; 2553 2554 Expr *getSubExpr() { return cast<Expr>(Op); } 2555 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2556 void setSubExpr(Expr *E) { Op = E; } 2557 2558 /// \brief Retrieve the cast subexpression as it was written in the source 2559 /// code, looking through any implicit casts or other intermediate nodes 2560 /// introduced by semantic analysis. 2561 Expr *getSubExprAsWritten(); 2562 const Expr *getSubExprAsWritten() const { 2563 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2564 } 2565 2566 typedef CXXBaseSpecifier **path_iterator; 2567 typedef const CXXBaseSpecifier * const *path_const_iterator; 2568 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2569 unsigned path_size() const { return CastExprBits.BasePathSize; } 2570 path_iterator path_begin() { return path_buffer(); } 2571 path_iterator path_end() { return path_buffer() + path_size(); } 2572 path_const_iterator path_begin() const { return path_buffer(); } 2573 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2574 2575 void setCastPath(const CXXCastPath &Path); 2576 2577 static bool classof(const Stmt *T) { 2578 return T->getStmtClass() >= firstCastExprConstant && 2579 T->getStmtClass() <= lastCastExprConstant; 2580 } 2581 static bool classof(const CastExpr *) { return true; } 2582 2583 // Iterators 2584 child_range children() { return child_range(&Op, &Op+1); } 2585}; 2586 2587/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2588/// conversions, which have no direct representation in the original 2589/// source code. For example: converting T[]->T*, void f()->void 2590/// (*f)(), float->double, short->int, etc. 2591/// 2592/// In C, implicit casts always produce rvalues. However, in C++, an 2593/// implicit cast whose result is being bound to a reference will be 2594/// an lvalue or xvalue. For example: 2595/// 2596/// @code 2597/// class Base { }; 2598/// class Derived : public Base { }; 2599/// Derived &&ref(); 2600/// void f(Derived d) { 2601/// Base& b = d; // initializer is an ImplicitCastExpr 2602/// // to an lvalue of type Base 2603/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2604/// // to an xvalue of type Base 2605/// } 2606/// @endcode 2607class ImplicitCastExpr : public CastExpr { 2608private: 2609 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2610 unsigned BasePathLength, ExprValueKind VK) 2611 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2612 } 2613 2614 /// \brief Construct an empty implicit cast. 2615 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2616 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2617 2618public: 2619 enum OnStack_t { OnStack }; 2620 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2621 ExprValueKind VK) 2622 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2623 } 2624 2625 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2626 CastKind Kind, Expr *Operand, 2627 const CXXCastPath *BasePath, 2628 ExprValueKind Cat); 2629 2630 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2631 2632 SourceRange getSourceRange() const { 2633 return getSubExpr()->getSourceRange(); 2634 } 2635 SourceLocation getLocStart() const { 2636 return getSubExpr()->getLocStart(); 2637 } 2638 SourceLocation getLocEnd() const { 2639 return getSubExpr()->getLocEnd(); 2640 } 2641 2642 static bool classof(const Stmt *T) { 2643 return T->getStmtClass() == ImplicitCastExprClass; 2644 } 2645 static bool classof(const ImplicitCastExpr *) { return true; } 2646}; 2647 2648inline Expr *Expr::IgnoreImpCasts() { 2649 Expr *e = this; 2650 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2651 e = ice->getSubExpr(); 2652 return e; 2653} 2654 2655/// ExplicitCastExpr - An explicit cast written in the source 2656/// code. 2657/// 2658/// This class is effectively an abstract class, because it provides 2659/// the basic representation of an explicitly-written cast without 2660/// specifying which kind of cast (C cast, functional cast, static 2661/// cast, etc.) was written; specific derived classes represent the 2662/// particular style of cast and its location information. 2663/// 2664/// Unlike implicit casts, explicit cast nodes have two different 2665/// types: the type that was written into the source code, and the 2666/// actual type of the expression as determined by semantic 2667/// analysis. These types may differ slightly. For example, in C++ one 2668/// can cast to a reference type, which indicates that the resulting 2669/// expression will be an lvalue or xvalue. The reference type, however, 2670/// will not be used as the type of the expression. 2671class ExplicitCastExpr : public CastExpr { 2672 /// TInfo - Source type info for the (written) type 2673 /// this expression is casting to. 2674 TypeSourceInfo *TInfo; 2675 2676protected: 2677 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2678 CastKind kind, Expr *op, unsigned PathSize, 2679 TypeSourceInfo *writtenTy) 2680 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2681 2682 /// \brief Construct an empty explicit cast. 2683 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2684 : CastExpr(SC, Shell, PathSize) { } 2685 2686public: 2687 /// getTypeInfoAsWritten - Returns the type source info for the type 2688 /// that this expression is casting to. 2689 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2690 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2691 2692 /// getTypeAsWritten - Returns the type that this expression is 2693 /// casting to, as written in the source code. 2694 QualType getTypeAsWritten() const { return TInfo->getType(); } 2695 2696 static bool classof(const Stmt *T) { 2697 return T->getStmtClass() >= firstExplicitCastExprConstant && 2698 T->getStmtClass() <= lastExplicitCastExprConstant; 2699 } 2700 static bool classof(const ExplicitCastExpr *) { return true; } 2701}; 2702 2703/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2704/// cast in C++ (C++ [expr.cast]), which uses the syntax 2705/// (Type)expr. For example: @c (int)f. 2706class CStyleCastExpr : public ExplicitCastExpr { 2707 SourceLocation LPLoc; // the location of the left paren 2708 SourceLocation RPLoc; // the location of the right paren 2709 2710 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2711 unsigned PathSize, TypeSourceInfo *writtenTy, 2712 SourceLocation l, SourceLocation r) 2713 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2714 writtenTy), LPLoc(l), RPLoc(r) {} 2715 2716 /// \brief Construct an empty C-style explicit cast. 2717 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2718 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2719 2720public: 2721 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2722 ExprValueKind VK, CastKind K, 2723 Expr *Op, const CXXCastPath *BasePath, 2724 TypeSourceInfo *WrittenTy, SourceLocation L, 2725 SourceLocation R); 2726 2727 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2728 2729 SourceLocation getLParenLoc() const { return LPLoc; } 2730 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2731 2732 SourceLocation getRParenLoc() const { return RPLoc; } 2733 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2734 2735 SourceRange getSourceRange() const { 2736 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2737 } 2738 static bool classof(const Stmt *T) { 2739 return T->getStmtClass() == CStyleCastExprClass; 2740 } 2741 static bool classof(const CStyleCastExpr *) { return true; } 2742}; 2743 2744/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2745/// 2746/// This expression node kind describes a builtin binary operation, 2747/// such as "x + y" for integer values "x" and "y". The operands will 2748/// already have been converted to appropriate types (e.g., by 2749/// performing promotions or conversions). 2750/// 2751/// In C++, where operators may be overloaded, a different kind of 2752/// expression node (CXXOperatorCallExpr) is used to express the 2753/// invocation of an overloaded operator with operator syntax. Within 2754/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2755/// used to store an expression "x + y" depends on the subexpressions 2756/// for x and y. If neither x or y is type-dependent, and the "+" 2757/// operator resolves to a built-in operation, BinaryOperator will be 2758/// used to express the computation (x and y may still be 2759/// value-dependent). If either x or y is type-dependent, or if the 2760/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2761/// be used to express the computation. 2762class BinaryOperator : public Expr { 2763public: 2764 typedef BinaryOperatorKind Opcode; 2765 2766private: 2767 unsigned Opc : 6; 2768 SourceLocation OpLoc; 2769 2770 enum { LHS, RHS, END_EXPR }; 2771 Stmt* SubExprs[END_EXPR]; 2772public: 2773 2774 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2775 ExprValueKind VK, ExprObjectKind OK, 2776 SourceLocation opLoc) 2777 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2778 lhs->isTypeDependent() || rhs->isTypeDependent(), 2779 lhs->isValueDependent() || rhs->isValueDependent(), 2780 (lhs->isInstantiationDependent() || 2781 rhs->isInstantiationDependent()), 2782 (lhs->containsUnexpandedParameterPack() || 2783 rhs->containsUnexpandedParameterPack())), 2784 Opc(opc), OpLoc(opLoc) { 2785 SubExprs[LHS] = lhs; 2786 SubExprs[RHS] = rhs; 2787 assert(!isCompoundAssignmentOp() && 2788 "Use ArithAssignBinaryOperator for compound assignments"); 2789 } 2790 2791 /// \brief Construct an empty binary operator. 2792 explicit BinaryOperator(EmptyShell Empty) 2793 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2794 2795 SourceLocation getExprLoc() const { return OpLoc; } 2796 SourceLocation getOperatorLoc() const { return OpLoc; } 2797 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2798 2799 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2800 void setOpcode(Opcode O) { Opc = O; } 2801 2802 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2803 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2804 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2805 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2806 2807 SourceRange getSourceRange() const { 2808 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2809 } 2810 2811 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2812 /// corresponds to, e.g. "<<=". 2813 static const char *getOpcodeStr(Opcode Op); 2814 2815 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2816 2817 /// \brief Retrieve the binary opcode that corresponds to the given 2818 /// overloaded operator. 2819 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2820 2821 /// \brief Retrieve the overloaded operator kind that corresponds to 2822 /// the given binary opcode. 2823 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2824 2825 /// predicates to categorize the respective opcodes. 2826 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2827 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2828 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2829 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2830 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2831 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2832 2833 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2834 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2835 2836 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2837 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2838 2839 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2840 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2841 2842 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2843 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2844 2845 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2846 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2847 2848 static bool isAssignmentOp(Opcode Opc) { 2849 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2850 } 2851 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2852 2853 static bool isCompoundAssignmentOp(Opcode Opc) { 2854 return Opc > BO_Assign && Opc <= BO_OrAssign; 2855 } 2856 bool isCompoundAssignmentOp() const { 2857 return isCompoundAssignmentOp(getOpcode()); 2858 } 2859 static Opcode getOpForCompoundAssignment(Opcode Opc) { 2860 assert(isCompoundAssignmentOp(Opc)); 2861 if (Opc >= BO_AndAssign) 2862 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 2863 else 2864 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 2865 } 2866 2867 static bool isShiftAssignOp(Opcode Opc) { 2868 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2869 } 2870 bool isShiftAssignOp() const { 2871 return isShiftAssignOp(getOpcode()); 2872 } 2873 2874 static bool classof(const Stmt *S) { 2875 return S->getStmtClass() >= firstBinaryOperatorConstant && 2876 S->getStmtClass() <= lastBinaryOperatorConstant; 2877 } 2878 static bool classof(const BinaryOperator *) { return true; } 2879 2880 // Iterators 2881 child_range children() { 2882 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2883 } 2884 2885protected: 2886 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2887 ExprValueKind VK, ExprObjectKind OK, 2888 SourceLocation opLoc, bool dead) 2889 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2890 lhs->isTypeDependent() || rhs->isTypeDependent(), 2891 lhs->isValueDependent() || rhs->isValueDependent(), 2892 (lhs->isInstantiationDependent() || 2893 rhs->isInstantiationDependent()), 2894 (lhs->containsUnexpandedParameterPack() || 2895 rhs->containsUnexpandedParameterPack())), 2896 Opc(opc), OpLoc(opLoc) { 2897 SubExprs[LHS] = lhs; 2898 SubExprs[RHS] = rhs; 2899 } 2900 2901 BinaryOperator(StmtClass SC, EmptyShell Empty) 2902 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2903}; 2904 2905/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2906/// track of the type the operation is performed in. Due to the semantics of 2907/// these operators, the operands are promoted, the arithmetic performed, an 2908/// implicit conversion back to the result type done, then the assignment takes 2909/// place. This captures the intermediate type which the computation is done 2910/// in. 2911class CompoundAssignOperator : public BinaryOperator { 2912 QualType ComputationLHSType; 2913 QualType ComputationResultType; 2914public: 2915 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2916 ExprValueKind VK, ExprObjectKind OK, 2917 QualType CompLHSType, QualType CompResultType, 2918 SourceLocation OpLoc) 2919 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2920 ComputationLHSType(CompLHSType), 2921 ComputationResultType(CompResultType) { 2922 assert(isCompoundAssignmentOp() && 2923 "Only should be used for compound assignments"); 2924 } 2925 2926 /// \brief Build an empty compound assignment operator expression. 2927 explicit CompoundAssignOperator(EmptyShell Empty) 2928 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2929 2930 // The two computation types are the type the LHS is converted 2931 // to for the computation and the type of the result; the two are 2932 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2933 QualType getComputationLHSType() const { return ComputationLHSType; } 2934 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2935 2936 QualType getComputationResultType() const { return ComputationResultType; } 2937 void setComputationResultType(QualType T) { ComputationResultType = T; } 2938 2939 static bool classof(const CompoundAssignOperator *) { return true; } 2940 static bool classof(const Stmt *S) { 2941 return S->getStmtClass() == CompoundAssignOperatorClass; 2942 } 2943}; 2944 2945/// AbstractConditionalOperator - An abstract base class for 2946/// ConditionalOperator and BinaryConditionalOperator. 2947class AbstractConditionalOperator : public Expr { 2948 SourceLocation QuestionLoc, ColonLoc; 2949 friend class ASTStmtReader; 2950 2951protected: 2952 AbstractConditionalOperator(StmtClass SC, QualType T, 2953 ExprValueKind VK, ExprObjectKind OK, 2954 bool TD, bool VD, bool ID, 2955 bool ContainsUnexpandedParameterPack, 2956 SourceLocation qloc, 2957 SourceLocation cloc) 2958 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 2959 QuestionLoc(qloc), ColonLoc(cloc) {} 2960 2961 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2962 : Expr(SC, Empty) { } 2963 2964public: 2965 // getCond - Return the expression representing the condition for 2966 // the ?: operator. 2967 Expr *getCond() const; 2968 2969 // getTrueExpr - Return the subexpression representing the value of 2970 // the expression if the condition evaluates to true. 2971 Expr *getTrueExpr() const; 2972 2973 // getFalseExpr - Return the subexpression representing the value of 2974 // the expression if the condition evaluates to false. This is 2975 // the same as getRHS. 2976 Expr *getFalseExpr() const; 2977 2978 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2979 SourceLocation getColonLoc() const { return ColonLoc; } 2980 2981 static bool classof(const Stmt *T) { 2982 return T->getStmtClass() == ConditionalOperatorClass || 2983 T->getStmtClass() == BinaryConditionalOperatorClass; 2984 } 2985 static bool classof(const AbstractConditionalOperator *) { return true; } 2986}; 2987 2988/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2989/// middle" extension is a BinaryConditionalOperator. 2990class ConditionalOperator : public AbstractConditionalOperator { 2991 enum { COND, LHS, RHS, END_EXPR }; 2992 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2993 2994 friend class ASTStmtReader; 2995public: 2996 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2997 SourceLocation CLoc, Expr *rhs, 2998 QualType t, ExprValueKind VK, ExprObjectKind OK) 2999 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 3000 // FIXME: the type of the conditional operator doesn't 3001 // depend on the type of the conditional, but the standard 3002 // seems to imply that it could. File a bug! 3003 (lhs->isTypeDependent() || rhs->isTypeDependent()), 3004 (cond->isValueDependent() || lhs->isValueDependent() || 3005 rhs->isValueDependent()), 3006 (cond->isInstantiationDependent() || 3007 lhs->isInstantiationDependent() || 3008 rhs->isInstantiationDependent()), 3009 (cond->containsUnexpandedParameterPack() || 3010 lhs->containsUnexpandedParameterPack() || 3011 rhs->containsUnexpandedParameterPack()), 3012 QLoc, CLoc) { 3013 SubExprs[COND] = cond; 3014 SubExprs[LHS] = lhs; 3015 SubExprs[RHS] = rhs; 3016 } 3017 3018 /// \brief Build an empty conditional operator. 3019 explicit ConditionalOperator(EmptyShell Empty) 3020 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 3021 3022 // getCond - Return the expression representing the condition for 3023 // the ?: operator. 3024 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3025 3026 // getTrueExpr - Return the subexpression representing the value of 3027 // the expression if the condition evaluates to true. 3028 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3029 3030 // getFalseExpr - Return the subexpression representing the value of 3031 // the expression if the condition evaluates to false. This is 3032 // the same as getRHS. 3033 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3034 3035 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3036 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3037 3038 SourceRange getSourceRange() const { 3039 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 3040 } 3041 static bool classof(const Stmt *T) { 3042 return T->getStmtClass() == ConditionalOperatorClass; 3043 } 3044 static bool classof(const ConditionalOperator *) { return true; } 3045 3046 // Iterators 3047 child_range children() { 3048 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3049 } 3050}; 3051 3052/// BinaryConditionalOperator - The GNU extension to the conditional 3053/// operator which allows the middle operand to be omitted. 3054/// 3055/// This is a different expression kind on the assumption that almost 3056/// every client ends up needing to know that these are different. 3057class BinaryConditionalOperator : public AbstractConditionalOperator { 3058 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3059 3060 /// - the common condition/left-hand-side expression, which will be 3061 /// evaluated as the opaque value 3062 /// - the condition, expressed in terms of the opaque value 3063 /// - the left-hand-side, expressed in terms of the opaque value 3064 /// - the right-hand-side 3065 Stmt *SubExprs[NUM_SUBEXPRS]; 3066 OpaqueValueExpr *OpaqueValue; 3067 3068 friend class ASTStmtReader; 3069public: 3070 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3071 Expr *cond, Expr *lhs, Expr *rhs, 3072 SourceLocation qloc, SourceLocation cloc, 3073 QualType t, ExprValueKind VK, ExprObjectKind OK) 3074 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3075 (common->isTypeDependent() || rhs->isTypeDependent()), 3076 (common->isValueDependent() || rhs->isValueDependent()), 3077 (common->isInstantiationDependent() || 3078 rhs->isInstantiationDependent()), 3079 (common->containsUnexpandedParameterPack() || 3080 rhs->containsUnexpandedParameterPack()), 3081 qloc, cloc), 3082 OpaqueValue(opaqueValue) { 3083 SubExprs[COMMON] = common; 3084 SubExprs[COND] = cond; 3085 SubExprs[LHS] = lhs; 3086 SubExprs[RHS] = rhs; 3087 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value"); 3088 } 3089 3090 /// \brief Build an empty conditional operator. 3091 explicit BinaryConditionalOperator(EmptyShell Empty) 3092 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3093 3094 /// \brief getCommon - Return the common expression, written to the 3095 /// left of the condition. The opaque value will be bound to the 3096 /// result of this expression. 3097 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3098 3099 /// \brief getOpaqueValue - Return the opaque value placeholder. 3100 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3101 3102 /// \brief getCond - Return the condition expression; this is defined 3103 /// in terms of the opaque value. 3104 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3105 3106 /// \brief getTrueExpr - Return the subexpression which will be 3107 /// evaluated if the condition evaluates to true; this is defined 3108 /// in terms of the opaque value. 3109 Expr *getTrueExpr() const { 3110 return cast<Expr>(SubExprs[LHS]); 3111 } 3112 3113 /// \brief getFalseExpr - Return the subexpression which will be 3114 /// evaluated if the condnition evaluates to false; this is 3115 /// defined in terms of the opaque value. 3116 Expr *getFalseExpr() const { 3117 return cast<Expr>(SubExprs[RHS]); 3118 } 3119 3120 SourceRange getSourceRange() const { 3121 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 3122 } 3123 static bool classof(const Stmt *T) { 3124 return T->getStmtClass() == BinaryConditionalOperatorClass; 3125 } 3126 static bool classof(const BinaryConditionalOperator *) { return true; } 3127 3128 // Iterators 3129 child_range children() { 3130 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3131 } 3132}; 3133 3134inline Expr *AbstractConditionalOperator::getCond() const { 3135 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3136 return co->getCond(); 3137 return cast<BinaryConditionalOperator>(this)->getCond(); 3138} 3139 3140inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3141 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3142 return co->getTrueExpr(); 3143 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3144} 3145 3146inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3147 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3148 return co->getFalseExpr(); 3149 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3150} 3151 3152/// AddrLabelExpr - The GNU address of label extension, representing &&label. 3153class AddrLabelExpr : public Expr { 3154 SourceLocation AmpAmpLoc, LabelLoc; 3155 LabelDecl *Label; 3156public: 3157 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3158 QualType t) 3159 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3160 false), 3161 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3162 3163 /// \brief Build an empty address of a label expression. 3164 explicit AddrLabelExpr(EmptyShell Empty) 3165 : Expr(AddrLabelExprClass, Empty) { } 3166 3167 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3168 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3169 SourceLocation getLabelLoc() const { return LabelLoc; } 3170 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3171 3172 SourceRange getSourceRange() const { 3173 return SourceRange(AmpAmpLoc, LabelLoc); 3174 } 3175 3176 LabelDecl *getLabel() const { return Label; } 3177 void setLabel(LabelDecl *L) { Label = L; } 3178 3179 static bool classof(const Stmt *T) { 3180 return T->getStmtClass() == AddrLabelExprClass; 3181 } 3182 static bool classof(const AddrLabelExpr *) { return true; } 3183 3184 // Iterators 3185 child_range children() { return child_range(); } 3186}; 3187 3188/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3189/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3190/// takes the value of the last subexpression. 3191/// 3192/// A StmtExpr is always an r-value; values "returned" out of a 3193/// StmtExpr will be copied. 3194class StmtExpr : public Expr { 3195 Stmt *SubStmt; 3196 SourceLocation LParenLoc, RParenLoc; 3197public: 3198 // FIXME: Does type-dependence need to be computed differently? 3199 // FIXME: Do we need to compute instantiation instantiation-dependence for 3200 // statements? (ugh!) 3201 StmtExpr(CompoundStmt *substmt, QualType T, 3202 SourceLocation lp, SourceLocation rp) : 3203 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3204 T->isDependentType(), false, false, false), 3205 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3206 3207 /// \brief Build an empty statement expression. 3208 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3209 3210 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3211 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3212 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3213 3214 SourceRange getSourceRange() const { 3215 return SourceRange(LParenLoc, RParenLoc); 3216 } 3217 3218 SourceLocation getLParenLoc() const { return LParenLoc; } 3219 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3220 SourceLocation getRParenLoc() const { return RParenLoc; } 3221 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3222 3223 static bool classof(const Stmt *T) { 3224 return T->getStmtClass() == StmtExprClass; 3225 } 3226 static bool classof(const StmtExpr *) { return true; } 3227 3228 // Iterators 3229 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3230}; 3231 3232 3233/// ShuffleVectorExpr - clang-specific builtin-in function 3234/// __builtin_shufflevector. 3235/// This AST node represents a operator that does a constant 3236/// shuffle, similar to LLVM's shufflevector instruction. It takes 3237/// two vectors and a variable number of constant indices, 3238/// and returns the appropriately shuffled vector. 3239class ShuffleVectorExpr : public Expr { 3240 SourceLocation BuiltinLoc, RParenLoc; 3241 3242 // SubExprs - the list of values passed to the __builtin_shufflevector 3243 // function. The first two are vectors, and the rest are constant 3244 // indices. The number of values in this list is always 3245 // 2+the number of indices in the vector type. 3246 Stmt **SubExprs; 3247 unsigned NumExprs; 3248 3249public: 3250 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3251 QualType Type, SourceLocation BLoc, 3252 SourceLocation RP); 3253 3254 /// \brief Build an empty vector-shuffle expression. 3255 explicit ShuffleVectorExpr(EmptyShell Empty) 3256 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3257 3258 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3259 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3260 3261 SourceLocation getRParenLoc() const { return RParenLoc; } 3262 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3263 3264 SourceRange getSourceRange() const { 3265 return SourceRange(BuiltinLoc, RParenLoc); 3266 } 3267 static bool classof(const Stmt *T) { 3268 return T->getStmtClass() == ShuffleVectorExprClass; 3269 } 3270 static bool classof(const ShuffleVectorExpr *) { return true; } 3271 3272 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3273 /// constant expression, the actual arguments passed in, and the function 3274 /// pointers. 3275 unsigned getNumSubExprs() const { return NumExprs; } 3276 3277 /// \brief Retrieve the array of expressions. 3278 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3279 3280 /// getExpr - Return the Expr at the specified index. 3281 Expr *getExpr(unsigned Index) { 3282 assert((Index < NumExprs) && "Arg access out of range!"); 3283 return cast<Expr>(SubExprs[Index]); 3284 } 3285 const Expr *getExpr(unsigned Index) const { 3286 assert((Index < NumExprs) && "Arg access out of range!"); 3287 return cast<Expr>(SubExprs[Index]); 3288 } 3289 3290 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3291 3292 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3293 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3294 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3295 } 3296 3297 // Iterators 3298 child_range children() { 3299 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3300 } 3301}; 3302 3303/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3304/// This AST node is similar to the conditional operator (?:) in C, with 3305/// the following exceptions: 3306/// - the test expression must be a integer constant expression. 3307/// - the expression returned acts like the chosen subexpression in every 3308/// visible way: the type is the same as that of the chosen subexpression, 3309/// and all predicates (whether it's an l-value, whether it's an integer 3310/// constant expression, etc.) return the same result as for the chosen 3311/// sub-expression. 3312class ChooseExpr : public Expr { 3313 enum { COND, LHS, RHS, END_EXPR }; 3314 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3315 SourceLocation BuiltinLoc, RParenLoc; 3316public: 3317 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3318 QualType t, ExprValueKind VK, ExprObjectKind OK, 3319 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3320 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3321 (cond->isInstantiationDependent() || 3322 lhs->isInstantiationDependent() || 3323 rhs->isInstantiationDependent()), 3324 (cond->containsUnexpandedParameterPack() || 3325 lhs->containsUnexpandedParameterPack() || 3326 rhs->containsUnexpandedParameterPack())), 3327 BuiltinLoc(BLoc), RParenLoc(RP) { 3328 SubExprs[COND] = cond; 3329 SubExprs[LHS] = lhs; 3330 SubExprs[RHS] = rhs; 3331 } 3332 3333 /// \brief Build an empty __builtin_choose_expr. 3334 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3335 3336 /// isConditionTrue - Return whether the condition is true (i.e. not 3337 /// equal to zero). 3338 bool isConditionTrue(const ASTContext &C) const; 3339 3340 /// getChosenSubExpr - Return the subexpression chosen according to the 3341 /// condition. 3342 Expr *getChosenSubExpr(const ASTContext &C) const { 3343 return isConditionTrue(C) ? getLHS() : getRHS(); 3344 } 3345 3346 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3347 void setCond(Expr *E) { SubExprs[COND] = E; } 3348 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3349 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3350 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3351 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3352 3353 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3354 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3355 3356 SourceLocation getRParenLoc() const { return RParenLoc; } 3357 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3358 3359 SourceRange getSourceRange() const { 3360 return SourceRange(BuiltinLoc, RParenLoc); 3361 } 3362 static bool classof(const Stmt *T) { 3363 return T->getStmtClass() == ChooseExprClass; 3364 } 3365 static bool classof(const ChooseExpr *) { return true; } 3366 3367 // Iterators 3368 child_range children() { 3369 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3370 } 3371}; 3372 3373/// GNUNullExpr - Implements the GNU __null extension, which is a name 3374/// for a null pointer constant that has integral type (e.g., int or 3375/// long) and is the same size and alignment as a pointer. The __null 3376/// extension is typically only used by system headers, which define 3377/// NULL as __null in C++ rather than using 0 (which is an integer 3378/// that may not match the size of a pointer). 3379class GNUNullExpr : public Expr { 3380 /// TokenLoc - The location of the __null keyword. 3381 SourceLocation TokenLoc; 3382 3383public: 3384 GNUNullExpr(QualType Ty, SourceLocation Loc) 3385 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3386 false), 3387 TokenLoc(Loc) { } 3388 3389 /// \brief Build an empty GNU __null expression. 3390 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3391 3392 /// getTokenLocation - The location of the __null token. 3393 SourceLocation getTokenLocation() const { return TokenLoc; } 3394 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3395 3396 SourceRange getSourceRange() const { 3397 return SourceRange(TokenLoc); 3398 } 3399 static bool classof(const Stmt *T) { 3400 return T->getStmtClass() == GNUNullExprClass; 3401 } 3402 static bool classof(const GNUNullExpr *) { return true; } 3403 3404 // Iterators 3405 child_range children() { return child_range(); } 3406}; 3407 3408/// VAArgExpr, used for the builtin function __builtin_va_arg. 3409class VAArgExpr : public Expr { 3410 Stmt *Val; 3411 TypeSourceInfo *TInfo; 3412 SourceLocation BuiltinLoc, RParenLoc; 3413public: 3414 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3415 SourceLocation RPLoc, QualType t) 3416 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3417 t->isDependentType(), false, 3418 (TInfo->getType()->isInstantiationDependentType() || 3419 e->isInstantiationDependent()), 3420 (TInfo->getType()->containsUnexpandedParameterPack() || 3421 e->containsUnexpandedParameterPack())), 3422 Val(e), TInfo(TInfo), 3423 BuiltinLoc(BLoc), 3424 RParenLoc(RPLoc) { } 3425 3426 /// \brief Create an empty __builtin_va_arg expression. 3427 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3428 3429 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3430 Expr *getSubExpr() { return cast<Expr>(Val); } 3431 void setSubExpr(Expr *E) { Val = E; } 3432 3433 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3434 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3435 3436 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3437 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3438 3439 SourceLocation getRParenLoc() const { return RParenLoc; } 3440 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3441 3442 SourceRange getSourceRange() const { 3443 return SourceRange(BuiltinLoc, RParenLoc); 3444 } 3445 static bool classof(const Stmt *T) { 3446 return T->getStmtClass() == VAArgExprClass; 3447 } 3448 static bool classof(const VAArgExpr *) { return true; } 3449 3450 // Iterators 3451 child_range children() { return child_range(&Val, &Val+1); } 3452}; 3453 3454/// @brief Describes an C or C++ initializer list. 3455/// 3456/// InitListExpr describes an initializer list, which can be used to 3457/// initialize objects of different types, including 3458/// struct/class/union types, arrays, and vectors. For example: 3459/// 3460/// @code 3461/// struct foo x = { 1, { 2, 3 } }; 3462/// @endcode 3463/// 3464/// Prior to semantic analysis, an initializer list will represent the 3465/// initializer list as written by the user, but will have the 3466/// placeholder type "void". This initializer list is called the 3467/// syntactic form of the initializer, and may contain C99 designated 3468/// initializers (represented as DesignatedInitExprs), initializations 3469/// of subobject members without explicit braces, and so on. Clients 3470/// interested in the original syntax of the initializer list should 3471/// use the syntactic form of the initializer list. 3472/// 3473/// After semantic analysis, the initializer list will represent the 3474/// semantic form of the initializer, where the initializations of all 3475/// subobjects are made explicit with nested InitListExpr nodes and 3476/// C99 designators have been eliminated by placing the designated 3477/// initializations into the subobject they initialize. Additionally, 3478/// any "holes" in the initialization, where no initializer has been 3479/// specified for a particular subobject, will be replaced with 3480/// implicitly-generated ImplicitValueInitExpr expressions that 3481/// value-initialize the subobjects. Note, however, that the 3482/// initializer lists may still have fewer initializers than there are 3483/// elements to initialize within the object. 3484/// 3485/// Given the semantic form of the initializer list, one can retrieve 3486/// the original syntactic form of that initializer list (if it 3487/// exists) using getSyntacticForm(). Since many initializer lists 3488/// have the same syntactic and semantic forms, getSyntacticForm() may 3489/// return NULL, indicating that the current initializer list also 3490/// serves as its syntactic form. 3491class InitListExpr : public Expr { 3492 // FIXME: Eliminate this vector in favor of ASTContext allocation 3493 typedef ASTVector<Stmt *> InitExprsTy; 3494 InitExprsTy InitExprs; 3495 SourceLocation LBraceLoc, RBraceLoc; 3496 3497 /// Contains the initializer list that describes the syntactic form 3498 /// written in the source code. 3499 InitListExpr *SyntacticForm; 3500 3501 /// \brief Either: 3502 /// If this initializer list initializes an array with more elements than 3503 /// there are initializers in the list, specifies an expression to be used 3504 /// for value initialization of the rest of the elements. 3505 /// Or 3506 /// If this initializer list initializes a union, specifies which 3507 /// field within the union will be initialized. 3508 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3509 3510public: 3511 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3512 Expr **initexprs, unsigned numinits, 3513 SourceLocation rbraceloc); 3514 3515 /// \brief Build an empty initializer list. 3516 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3517 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3518 3519 unsigned getNumInits() const { return InitExprs.size(); } 3520 3521 /// \brief Retrieve the set of initializers. 3522 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3523 3524 const Expr *getInit(unsigned Init) const { 3525 assert(Init < getNumInits() && "Initializer access out of range!"); 3526 return cast_or_null<Expr>(InitExprs[Init]); 3527 } 3528 3529 Expr *getInit(unsigned Init) { 3530 assert(Init < getNumInits() && "Initializer access out of range!"); 3531 return cast_or_null<Expr>(InitExprs[Init]); 3532 } 3533 3534 void setInit(unsigned Init, Expr *expr) { 3535 assert(Init < getNumInits() && "Initializer access out of range!"); 3536 InitExprs[Init] = expr; 3537 } 3538 3539 /// \brief Reserve space for some number of initializers. 3540 void reserveInits(ASTContext &C, unsigned NumInits); 3541 3542 /// @brief Specify the number of initializers 3543 /// 3544 /// If there are more than @p NumInits initializers, the remaining 3545 /// initializers will be destroyed. If there are fewer than @p 3546 /// NumInits initializers, NULL expressions will be added for the 3547 /// unknown initializers. 3548 void resizeInits(ASTContext &Context, unsigned NumInits); 3549 3550 /// @brief Updates the initializer at index @p Init with the new 3551 /// expression @p expr, and returns the old expression at that 3552 /// location. 3553 /// 3554 /// When @p Init is out of range for this initializer list, the 3555 /// initializer list will be extended with NULL expressions to 3556 /// accommodate the new entry. 3557 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3558 3559 /// \brief If this initializer list initializes an array with more elements 3560 /// than there are initializers in the list, specifies an expression to be 3561 /// used for value initialization of the rest of the elements. 3562 Expr *getArrayFiller() { 3563 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3564 } 3565 const Expr *getArrayFiller() const { 3566 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3567 } 3568 void setArrayFiller(Expr *filler); 3569 3570 /// \brief Return true if this is an array initializer and its array "filler" 3571 /// has been set. 3572 bool hasArrayFiller() const { return getArrayFiller(); } 3573 3574 /// \brief If this initializes a union, specifies which field in the 3575 /// union to initialize. 3576 /// 3577 /// Typically, this field is the first named field within the 3578 /// union. However, a designated initializer can specify the 3579 /// initialization of a different field within the union. 3580 FieldDecl *getInitializedFieldInUnion() { 3581 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3582 } 3583 const FieldDecl *getInitializedFieldInUnion() const { 3584 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3585 } 3586 void setInitializedFieldInUnion(FieldDecl *FD) { 3587 ArrayFillerOrUnionFieldInit = FD; 3588 } 3589 3590 // Explicit InitListExpr's originate from source code (and have valid source 3591 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3592 bool isExplicit() { 3593 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3594 } 3595 3596 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3597 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3598 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3599 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3600 3601 /// @brief Retrieve the initializer list that describes the 3602 /// syntactic form of the initializer. 3603 /// 3604 /// 3605 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3606 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3607 3608 bool hadArrayRangeDesignator() const { 3609 return InitListExprBits.HadArrayRangeDesignator != 0; 3610 } 3611 void sawArrayRangeDesignator(bool ARD = true) { 3612 InitListExprBits.HadArrayRangeDesignator = ARD; 3613 } 3614 3615 bool initializesStdInitializerList() const { 3616 return InitListExprBits.InitializesStdInitializerList != 0; 3617 } 3618 void setInitializesStdInitializerList(bool ISIL = true) { 3619 InitListExprBits.InitializesStdInitializerList = ISIL; 3620 } 3621 3622 SourceRange getSourceRange() const; 3623 3624 static bool classof(const Stmt *T) { 3625 return T->getStmtClass() == InitListExprClass; 3626 } 3627 static bool classof(const InitListExpr *) { return true; } 3628 3629 // Iterators 3630 child_range children() { 3631 if (InitExprs.empty()) return child_range(); 3632 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3633 } 3634 3635 typedef InitExprsTy::iterator iterator; 3636 typedef InitExprsTy::const_iterator const_iterator; 3637 typedef InitExprsTy::reverse_iterator reverse_iterator; 3638 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3639 3640 iterator begin() { return InitExprs.begin(); } 3641 const_iterator begin() const { return InitExprs.begin(); } 3642 iterator end() { return InitExprs.end(); } 3643 const_iterator end() const { return InitExprs.end(); } 3644 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3645 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3646 reverse_iterator rend() { return InitExprs.rend(); } 3647 const_reverse_iterator rend() const { return InitExprs.rend(); } 3648 3649 friend class ASTStmtReader; 3650 friend class ASTStmtWriter; 3651}; 3652 3653/// @brief Represents a C99 designated initializer expression. 3654/// 3655/// A designated initializer expression (C99 6.7.8) contains one or 3656/// more designators (which can be field designators, array 3657/// designators, or GNU array-range designators) followed by an 3658/// expression that initializes the field or element(s) that the 3659/// designators refer to. For example, given: 3660/// 3661/// @code 3662/// struct point { 3663/// double x; 3664/// double y; 3665/// }; 3666/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3667/// @endcode 3668/// 3669/// The InitListExpr contains three DesignatedInitExprs, the first of 3670/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3671/// designators, one array designator for @c [2] followed by one field 3672/// designator for @c .y. The initalization expression will be 1.0. 3673class DesignatedInitExpr : public Expr { 3674public: 3675 /// \brief Forward declaration of the Designator class. 3676 class Designator; 3677 3678private: 3679 /// The location of the '=' or ':' prior to the actual initializer 3680 /// expression. 3681 SourceLocation EqualOrColonLoc; 3682 3683 /// Whether this designated initializer used the GNU deprecated 3684 /// syntax rather than the C99 '=' syntax. 3685 bool GNUSyntax : 1; 3686 3687 /// The number of designators in this initializer expression. 3688 unsigned NumDesignators : 15; 3689 3690 /// The number of subexpressions of this initializer expression, 3691 /// which contains both the initializer and any additional 3692 /// expressions used by array and array-range designators. 3693 unsigned NumSubExprs : 16; 3694 3695 /// \brief The designators in this designated initialization 3696 /// expression. 3697 Designator *Designators; 3698 3699 3700 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3701 const Designator *Designators, 3702 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3703 Expr **IndexExprs, unsigned NumIndexExprs, 3704 Expr *Init); 3705 3706 explicit DesignatedInitExpr(unsigned NumSubExprs) 3707 : Expr(DesignatedInitExprClass, EmptyShell()), 3708 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(0) { } 3709 3710public: 3711 /// A field designator, e.g., ".x". 3712 struct FieldDesignator { 3713 /// Refers to the field that is being initialized. The low bit 3714 /// of this field determines whether this is actually a pointer 3715 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3716 /// initially constructed, a field designator will store an 3717 /// IdentifierInfo*. After semantic analysis has resolved that 3718 /// name, the field designator will instead store a FieldDecl*. 3719 uintptr_t NameOrField; 3720 3721 /// The location of the '.' in the designated initializer. 3722 unsigned DotLoc; 3723 3724 /// The location of the field name in the designated initializer. 3725 unsigned FieldLoc; 3726 }; 3727 3728 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3729 struct ArrayOrRangeDesignator { 3730 /// Location of the first index expression within the designated 3731 /// initializer expression's list of subexpressions. 3732 unsigned Index; 3733 /// The location of the '[' starting the array range designator. 3734 unsigned LBracketLoc; 3735 /// The location of the ellipsis separating the start and end 3736 /// indices. Only valid for GNU array-range designators. 3737 unsigned EllipsisLoc; 3738 /// The location of the ']' terminating the array range designator. 3739 unsigned RBracketLoc; 3740 }; 3741 3742 /// @brief Represents a single C99 designator. 3743 /// 3744 /// @todo This class is infuriatingly similar to clang::Designator, 3745 /// but minor differences (storing indices vs. storing pointers) 3746 /// keep us from reusing it. Try harder, later, to rectify these 3747 /// differences. 3748 class Designator { 3749 /// @brief The kind of designator this describes. 3750 enum { 3751 FieldDesignator, 3752 ArrayDesignator, 3753 ArrayRangeDesignator 3754 } Kind; 3755 3756 union { 3757 /// A field designator, e.g., ".x". 3758 struct FieldDesignator Field; 3759 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3760 struct ArrayOrRangeDesignator ArrayOrRange; 3761 }; 3762 friend class DesignatedInitExpr; 3763 3764 public: 3765 Designator() {} 3766 3767 /// @brief Initializes a field designator. 3768 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3769 SourceLocation FieldLoc) 3770 : Kind(FieldDesignator) { 3771 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3772 Field.DotLoc = DotLoc.getRawEncoding(); 3773 Field.FieldLoc = FieldLoc.getRawEncoding(); 3774 } 3775 3776 /// @brief Initializes an array designator. 3777 Designator(unsigned Index, SourceLocation LBracketLoc, 3778 SourceLocation RBracketLoc) 3779 : Kind(ArrayDesignator) { 3780 ArrayOrRange.Index = Index; 3781 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3782 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3783 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3784 } 3785 3786 /// @brief Initializes a GNU array-range designator. 3787 Designator(unsigned Index, SourceLocation LBracketLoc, 3788 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3789 : Kind(ArrayRangeDesignator) { 3790 ArrayOrRange.Index = Index; 3791 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3792 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3793 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3794 } 3795 3796 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3797 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3798 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3799 3800 IdentifierInfo *getFieldName() const; 3801 3802 FieldDecl *getField() const { 3803 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3804 if (Field.NameOrField & 0x01) 3805 return 0; 3806 else 3807 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3808 } 3809 3810 void setField(FieldDecl *FD) { 3811 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3812 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3813 } 3814 3815 SourceLocation getDotLoc() const { 3816 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3817 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3818 } 3819 3820 SourceLocation getFieldLoc() const { 3821 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3822 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3823 } 3824 3825 SourceLocation getLBracketLoc() const { 3826 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3827 "Only valid on an array or array-range designator"); 3828 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3829 } 3830 3831 SourceLocation getRBracketLoc() const { 3832 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3833 "Only valid on an array or array-range designator"); 3834 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3835 } 3836 3837 SourceLocation getEllipsisLoc() const { 3838 assert(Kind == ArrayRangeDesignator && 3839 "Only valid on an array-range designator"); 3840 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3841 } 3842 3843 unsigned getFirstExprIndex() const { 3844 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3845 "Only valid on an array or array-range designator"); 3846 return ArrayOrRange.Index; 3847 } 3848 3849 SourceLocation getStartLocation() const { 3850 if (Kind == FieldDesignator) 3851 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3852 else 3853 return getLBracketLoc(); 3854 } 3855 SourceLocation getEndLocation() const { 3856 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3857 } 3858 SourceRange getSourceRange() const { 3859 return SourceRange(getStartLocation(), getEndLocation()); 3860 } 3861 }; 3862 3863 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3864 unsigned NumDesignators, 3865 Expr **IndexExprs, unsigned NumIndexExprs, 3866 SourceLocation EqualOrColonLoc, 3867 bool GNUSyntax, Expr *Init); 3868 3869 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3870 3871 /// @brief Returns the number of designators in this initializer. 3872 unsigned size() const { return NumDesignators; } 3873 3874 // Iterator access to the designators. 3875 typedef Designator *designators_iterator; 3876 designators_iterator designators_begin() { return Designators; } 3877 designators_iterator designators_end() { 3878 return Designators + NumDesignators; 3879 } 3880 3881 typedef const Designator *const_designators_iterator; 3882 const_designators_iterator designators_begin() const { return Designators; } 3883 const_designators_iterator designators_end() const { 3884 return Designators + NumDesignators; 3885 } 3886 3887 typedef std::reverse_iterator<designators_iterator> 3888 reverse_designators_iterator; 3889 reverse_designators_iterator designators_rbegin() { 3890 return reverse_designators_iterator(designators_end()); 3891 } 3892 reverse_designators_iterator designators_rend() { 3893 return reverse_designators_iterator(designators_begin()); 3894 } 3895 3896 typedef std::reverse_iterator<const_designators_iterator> 3897 const_reverse_designators_iterator; 3898 const_reverse_designators_iterator designators_rbegin() const { 3899 return const_reverse_designators_iterator(designators_end()); 3900 } 3901 const_reverse_designators_iterator designators_rend() const { 3902 return const_reverse_designators_iterator(designators_begin()); 3903 } 3904 3905 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3906 3907 void setDesignators(ASTContext &C, const Designator *Desigs, 3908 unsigned NumDesigs); 3909 3910 Expr *getArrayIndex(const Designator& D); 3911 Expr *getArrayRangeStart(const Designator& D); 3912 Expr *getArrayRangeEnd(const Designator& D); 3913 3914 /// @brief Retrieve the location of the '=' that precedes the 3915 /// initializer value itself, if present. 3916 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3917 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3918 3919 /// @brief Determines whether this designated initializer used the 3920 /// deprecated GNU syntax for designated initializers. 3921 bool usesGNUSyntax() const { return GNUSyntax; } 3922 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3923 3924 /// @brief Retrieve the initializer value. 3925 Expr *getInit() const { 3926 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3927 } 3928 3929 void setInit(Expr *init) { 3930 *child_begin() = init; 3931 } 3932 3933 /// \brief Retrieve the total number of subexpressions in this 3934 /// designated initializer expression, including the actual 3935 /// initialized value and any expressions that occur within array 3936 /// and array-range designators. 3937 unsigned getNumSubExprs() const { return NumSubExprs; } 3938 3939 Expr *getSubExpr(unsigned Idx) { 3940 assert(Idx < NumSubExprs && "Subscript out of range"); 3941 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3942 Ptr += sizeof(DesignatedInitExpr); 3943 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3944 } 3945 3946 void setSubExpr(unsigned Idx, Expr *E) { 3947 assert(Idx < NumSubExprs && "Subscript out of range"); 3948 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3949 Ptr += sizeof(DesignatedInitExpr); 3950 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3951 } 3952 3953 /// \brief Replaces the designator at index @p Idx with the series 3954 /// of designators in [First, Last). 3955 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3956 const Designator *Last); 3957 3958 SourceRange getDesignatorsSourceRange() const; 3959 3960 SourceRange getSourceRange() const; 3961 3962 static bool classof(const Stmt *T) { 3963 return T->getStmtClass() == DesignatedInitExprClass; 3964 } 3965 static bool classof(const DesignatedInitExpr *) { return true; } 3966 3967 // Iterators 3968 child_range children() { 3969 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3970 return child_range(begin, begin + NumSubExprs); 3971 } 3972}; 3973 3974/// \brief Represents an implicitly-generated value initialization of 3975/// an object of a given type. 3976/// 3977/// Implicit value initializations occur within semantic initializer 3978/// list expressions (InitListExpr) as placeholders for subobject 3979/// initializations not explicitly specified by the user. 3980/// 3981/// \see InitListExpr 3982class ImplicitValueInitExpr : public Expr { 3983public: 3984 explicit ImplicitValueInitExpr(QualType ty) 3985 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3986 false, false, ty->isInstantiationDependentType(), false) { } 3987 3988 /// \brief Construct an empty implicit value initialization. 3989 explicit ImplicitValueInitExpr(EmptyShell Empty) 3990 : Expr(ImplicitValueInitExprClass, Empty) { } 3991 3992 static bool classof(const Stmt *T) { 3993 return T->getStmtClass() == ImplicitValueInitExprClass; 3994 } 3995 static bool classof(const ImplicitValueInitExpr *) { return true; } 3996 3997 SourceRange getSourceRange() const { 3998 return SourceRange(); 3999 } 4000 4001 // Iterators 4002 child_range children() { return child_range(); } 4003}; 4004 4005 4006class ParenListExpr : public Expr { 4007 Stmt **Exprs; 4008 unsigned NumExprs; 4009 SourceLocation LParenLoc, RParenLoc; 4010 4011public: 4012 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 4013 unsigned numexprs, SourceLocation rparenloc); 4014 4015 /// \brief Build an empty paren list. 4016 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 4017 4018 unsigned getNumExprs() const { return NumExprs; } 4019 4020 const Expr* getExpr(unsigned Init) const { 4021 assert(Init < getNumExprs() && "Initializer access out of range!"); 4022 return cast_or_null<Expr>(Exprs[Init]); 4023 } 4024 4025 Expr* getExpr(unsigned Init) { 4026 assert(Init < getNumExprs() && "Initializer access out of range!"); 4027 return cast_or_null<Expr>(Exprs[Init]); 4028 } 4029 4030 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 4031 4032 SourceLocation getLParenLoc() const { return LParenLoc; } 4033 SourceLocation getRParenLoc() const { return RParenLoc; } 4034 4035 SourceRange getSourceRange() const { 4036 return SourceRange(LParenLoc, RParenLoc); 4037 } 4038 static bool classof(const Stmt *T) { 4039 return T->getStmtClass() == ParenListExprClass; 4040 } 4041 static bool classof(const ParenListExpr *) { return true; } 4042 4043 // Iterators 4044 child_range children() { 4045 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4046 } 4047 4048 friend class ASTStmtReader; 4049 friend class ASTStmtWriter; 4050}; 4051 4052 4053/// \brief Represents a C11 generic selection. 4054/// 4055/// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4056/// expression, followed by one or more generic associations. Each generic 4057/// association specifies a type name and an expression, or "default" and an 4058/// expression (in which case it is known as a default generic association). 4059/// The type and value of the generic selection are identical to those of its 4060/// result expression, which is defined as the expression in the generic 4061/// association with a type name that is compatible with the type of the 4062/// controlling expression, or the expression in the default generic association 4063/// if no types are compatible. For example: 4064/// 4065/// @code 4066/// _Generic(X, double: 1, float: 2, default: 3) 4067/// @endcode 4068/// 4069/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4070/// or 3 if "hello". 4071/// 4072/// As an extension, generic selections are allowed in C++, where the following 4073/// additional semantics apply: 4074/// 4075/// Any generic selection whose controlling expression is type-dependent or 4076/// which names a dependent type in its association list is result-dependent, 4077/// which means that the choice of result expression is dependent. 4078/// Result-dependent generic associations are both type- and value-dependent. 4079class GenericSelectionExpr : public Expr { 4080 enum { CONTROLLING, END_EXPR }; 4081 TypeSourceInfo **AssocTypes; 4082 Stmt **SubExprs; 4083 unsigned NumAssocs, ResultIndex; 4084 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4085 4086public: 4087 GenericSelectionExpr(ASTContext &Context, 4088 SourceLocation GenericLoc, Expr *ControllingExpr, 4089 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4090 unsigned NumAssocs, SourceLocation DefaultLoc, 4091 SourceLocation RParenLoc, 4092 bool ContainsUnexpandedParameterPack, 4093 unsigned ResultIndex); 4094 4095 /// This constructor is used in the result-dependent case. 4096 GenericSelectionExpr(ASTContext &Context, 4097 SourceLocation GenericLoc, Expr *ControllingExpr, 4098 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4099 unsigned NumAssocs, SourceLocation DefaultLoc, 4100 SourceLocation RParenLoc, 4101 bool ContainsUnexpandedParameterPack); 4102 4103 explicit GenericSelectionExpr(EmptyShell Empty) 4104 : Expr(GenericSelectionExprClass, Empty) { } 4105 4106 unsigned getNumAssocs() const { return NumAssocs; } 4107 4108 SourceLocation getGenericLoc() const { return GenericLoc; } 4109 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4110 SourceLocation getRParenLoc() const { return RParenLoc; } 4111 4112 const Expr *getAssocExpr(unsigned i) const { 4113 return cast<Expr>(SubExprs[END_EXPR+i]); 4114 } 4115 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4116 4117 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4118 return AssocTypes[i]; 4119 } 4120 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4121 4122 QualType getAssocType(unsigned i) const { 4123 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4124 return TS->getType(); 4125 else 4126 return QualType(); 4127 } 4128 4129 const Expr *getControllingExpr() const { 4130 return cast<Expr>(SubExprs[CONTROLLING]); 4131 } 4132 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4133 4134 /// Whether this generic selection is result-dependent. 4135 bool isResultDependent() const { return ResultIndex == -1U; } 4136 4137 /// The zero-based index of the result expression's generic association in 4138 /// the generic selection's association list. Defined only if the 4139 /// generic selection is not result-dependent. 4140 unsigned getResultIndex() const { 4141 assert(!isResultDependent() && "Generic selection is result-dependent"); 4142 return ResultIndex; 4143 } 4144 4145 /// The generic selection's result expression. Defined only if the 4146 /// generic selection is not result-dependent. 4147 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4148 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4149 4150 SourceRange getSourceRange() const { 4151 return SourceRange(GenericLoc, RParenLoc); 4152 } 4153 static bool classof(const Stmt *T) { 4154 return T->getStmtClass() == GenericSelectionExprClass; 4155 } 4156 static bool classof(const GenericSelectionExpr *) { return true; } 4157 4158 child_range children() { 4159 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4160 } 4161 4162 friend class ASTStmtReader; 4163}; 4164 4165//===----------------------------------------------------------------------===// 4166// Clang Extensions 4167//===----------------------------------------------------------------------===// 4168 4169 4170/// ExtVectorElementExpr - This represents access to specific elements of a 4171/// vector, and may occur on the left hand side or right hand side. For example 4172/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4173/// 4174/// Note that the base may have either vector or pointer to vector type, just 4175/// like a struct field reference. 4176/// 4177class ExtVectorElementExpr : public Expr { 4178 Stmt *Base; 4179 IdentifierInfo *Accessor; 4180 SourceLocation AccessorLoc; 4181public: 4182 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4183 IdentifierInfo &accessor, SourceLocation loc) 4184 : Expr(ExtVectorElementExprClass, ty, VK, 4185 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4186 base->isTypeDependent(), base->isValueDependent(), 4187 base->isInstantiationDependent(), 4188 base->containsUnexpandedParameterPack()), 4189 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4190 4191 /// \brief Build an empty vector element expression. 4192 explicit ExtVectorElementExpr(EmptyShell Empty) 4193 : Expr(ExtVectorElementExprClass, Empty) { } 4194 4195 const Expr *getBase() const { return cast<Expr>(Base); } 4196 Expr *getBase() { return cast<Expr>(Base); } 4197 void setBase(Expr *E) { Base = E; } 4198 4199 IdentifierInfo &getAccessor() const { return *Accessor; } 4200 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4201 4202 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4203 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4204 4205 /// getNumElements - Get the number of components being selected. 4206 unsigned getNumElements() const; 4207 4208 /// containsDuplicateElements - Return true if any element access is 4209 /// repeated. 4210 bool containsDuplicateElements() const; 4211 4212 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4213 /// aggregate Constant of ConstantInt(s). 4214 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4215 4216 SourceRange getSourceRange() const { 4217 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4218 } 4219 4220 /// isArrow - Return true if the base expression is a pointer to vector, 4221 /// return false if the base expression is a vector. 4222 bool isArrow() const; 4223 4224 static bool classof(const Stmt *T) { 4225 return T->getStmtClass() == ExtVectorElementExprClass; 4226 } 4227 static bool classof(const ExtVectorElementExpr *) { return true; } 4228 4229 // Iterators 4230 child_range children() { return child_range(&Base, &Base+1); } 4231}; 4232 4233 4234/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4235/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4236class BlockExpr : public Expr { 4237protected: 4238 BlockDecl *TheBlock; 4239public: 4240 BlockExpr(BlockDecl *BD, QualType ty) 4241 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4242 ty->isDependentType(), ty->isDependentType(), 4243 ty->isInstantiationDependentType() || BD->isDependentContext(), 4244 false), 4245 TheBlock(BD) {} 4246 4247 /// \brief Build an empty block expression. 4248 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4249 4250 const BlockDecl *getBlockDecl() const { return TheBlock; } 4251 BlockDecl *getBlockDecl() { return TheBlock; } 4252 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4253 4254 // Convenience functions for probing the underlying BlockDecl. 4255 SourceLocation getCaretLocation() const; 4256 const Stmt *getBody() const; 4257 Stmt *getBody(); 4258 4259 SourceRange getSourceRange() const { 4260 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4261 } 4262 4263 /// getFunctionType - Return the underlying function type for this block. 4264 const FunctionProtoType *getFunctionType() const; 4265 4266 static bool classof(const Stmt *T) { 4267 return T->getStmtClass() == BlockExprClass; 4268 } 4269 static bool classof(const BlockExpr *) { return true; } 4270 4271 // Iterators 4272 child_range children() { return child_range(); } 4273}; 4274 4275/// BlockDeclRefExpr - A reference to a local variable declared in an 4276/// enclosing scope. 4277class BlockDeclRefExpr : public Expr { 4278 VarDecl *D; 4279 SourceLocation Loc; 4280 bool IsByRef : 1; 4281 bool ConstQualAdded : 1; 4282public: 4283 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 4284 SourceLocation l, bool ByRef, bool constAdded = false); 4285 4286 // \brief Build an empty reference to a declared variable in a 4287 // block. 4288 explicit BlockDeclRefExpr(EmptyShell Empty) 4289 : Expr(BlockDeclRefExprClass, Empty) { } 4290 4291 VarDecl *getDecl() { return D; } 4292 const VarDecl *getDecl() const { return D; } 4293 void setDecl(VarDecl *VD) { D = VD; } 4294 4295 SourceLocation getLocation() const { return Loc; } 4296 void setLocation(SourceLocation L) { Loc = L; } 4297 4298 SourceRange getSourceRange() const { return SourceRange(Loc); } 4299 4300 bool isByRef() const { return IsByRef; } 4301 void setByRef(bool BR) { IsByRef = BR; } 4302 4303 bool isConstQualAdded() const { return ConstQualAdded; } 4304 void setConstQualAdded(bool C) { ConstQualAdded = C; } 4305 4306 static bool classof(const Stmt *T) { 4307 return T->getStmtClass() == BlockDeclRefExprClass; 4308 } 4309 static bool classof(const BlockDeclRefExpr *) { return true; } 4310 4311 // Iterators 4312 child_range children() { return child_range(); } 4313}; 4314 4315/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4316/// This AST node provides support for reinterpreting a type to another 4317/// type of the same size. 4318class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4319private: 4320 Stmt *SrcExpr; 4321 SourceLocation BuiltinLoc, RParenLoc; 4322 4323 friend class ASTReader; 4324 friend class ASTStmtReader; 4325 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4326 4327public: 4328 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4329 ExprValueKind VK, ExprObjectKind OK, 4330 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4331 : Expr(AsTypeExprClass, DstType, VK, OK, 4332 DstType->isDependentType(), 4333 DstType->isDependentType() || SrcExpr->isValueDependent(), 4334 (DstType->isInstantiationDependentType() || 4335 SrcExpr->isInstantiationDependent()), 4336 (DstType->containsUnexpandedParameterPack() || 4337 SrcExpr->containsUnexpandedParameterPack())), 4338 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4339 4340 /// getSrcExpr - Return the Expr to be converted. 4341 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4342 4343 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4344 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4345 4346 /// getRParenLoc - Return the location of final right parenthesis. 4347 SourceLocation getRParenLoc() const { return RParenLoc; } 4348 4349 SourceRange getSourceRange() const { 4350 return SourceRange(BuiltinLoc, RParenLoc); 4351 } 4352 4353 static bool classof(const Stmt *T) { 4354 return T->getStmtClass() == AsTypeExprClass; 4355 } 4356 static bool classof(const AsTypeExpr *) { return true; } 4357 4358 // Iterators 4359 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4360}; 4361 4362/// PseudoObjectExpr - An expression which accesses a pseudo-object 4363/// l-value. A pseudo-object is an abstract object, accesses to which 4364/// are translated to calls. The pseudo-object expression has a 4365/// syntactic form, which shows how the expression was actually 4366/// written in the source code, and a semantic form, which is a series 4367/// of expressions to be executed in order which detail how the 4368/// operation is actually evaluated. Optionally, one of the semantic 4369/// forms may also provide a result value for the expression. 4370/// 4371/// If any of the semantic-form expressions is an OpaqueValueExpr, 4372/// that OVE is required to have a source expression, and it is bound 4373/// to the result of that source expression. Such OVEs may appear 4374/// only in subsequent semantic-form expressions and as 4375/// sub-expressions of the syntactic form. 4376/// 4377/// PseudoObjectExpr should be used only when an operation can be 4378/// usefully described in terms of fairly simple rewrite rules on 4379/// objects and functions that are meant to be used by end-developers. 4380/// For example, under the Itanium ABI, dynamic casts are implemented 4381/// as a call to a runtime function called __dynamic_cast; using this 4382/// class to describe that would be inappropriate because that call is 4383/// not really part of the user-visible semantics, and instead the 4384/// cast is properly reflected in the AST and IR-generation has been 4385/// taught to generate the call as necessary. In contrast, an 4386/// Objective-C property access is semantically defined to be 4387/// equivalent to a particular message send, and this is very much 4388/// part of the user model. The name of this class encourages this 4389/// modelling design. 4390class PseudoObjectExpr : public Expr { 4391 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4392 // Always at least two, because the first sub-expression is the 4393 // syntactic form. 4394 4395 // PseudoObjectExprBits.ResultIndex - The index of the 4396 // sub-expression holding the result. 0 means the result is void, 4397 // which is unambiguous because it's the index of the syntactic 4398 // form. Note that this is therefore 1 higher than the value passed 4399 // in to Create, which is an index within the semantic forms. 4400 // Note also that ASTStmtWriter assumes this encoding. 4401 4402 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); } 4403 const Expr * const *getSubExprsBuffer() const { 4404 return reinterpret_cast<const Expr * const *>(this + 1); 4405 } 4406 4407 friend class ASTStmtReader; 4408 4409 PseudoObjectExpr(QualType type, ExprValueKind VK, 4410 Expr *syntactic, ArrayRef<Expr*> semantic, 4411 unsigned resultIndex); 4412 4413 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4414 4415 unsigned getNumSubExprs() const { 4416 return PseudoObjectExprBits.NumSubExprs; 4417 } 4418 4419public: 4420 /// NoResult - A value for the result index indicating that there is 4421 /// no semantic result. 4422 enum { NoResult = ~0U }; 4423 4424 static PseudoObjectExpr *Create(ASTContext &Context, Expr *syntactic, 4425 ArrayRef<Expr*> semantic, 4426 unsigned resultIndex); 4427 4428 static PseudoObjectExpr *Create(ASTContext &Context, EmptyShell shell, 4429 unsigned numSemanticExprs); 4430 4431 /// Return the syntactic form of this expression, i.e. the 4432 /// expression it actually looks like. Likely to be expressed in 4433 /// terms of OpaqueValueExprs bound in the semantic form. 4434 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 4435 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 4436 4437 /// Return the index of the result-bearing expression into the semantics 4438 /// expressions, or PseudoObjectExpr::NoResult if there is none. 4439 unsigned getResultExprIndex() const { 4440 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 4441 return PseudoObjectExprBits.ResultIndex - 1; 4442 } 4443 4444 /// Return the result-bearing expression, or null if there is none. 4445 Expr *getResultExpr() { 4446 if (PseudoObjectExprBits.ResultIndex == 0) 4447 return 0; 4448 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 4449 } 4450 const Expr *getResultExpr() const { 4451 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 4452 } 4453 4454 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 4455 4456 typedef Expr * const *semantics_iterator; 4457 typedef const Expr * const *const_semantics_iterator; 4458 semantics_iterator semantics_begin() { 4459 return getSubExprsBuffer() + 1; 4460 } 4461 const_semantics_iterator semantics_begin() const { 4462 return getSubExprsBuffer() + 1; 4463 } 4464 semantics_iterator semantics_end() { 4465 return getSubExprsBuffer() + getNumSubExprs(); 4466 } 4467 const_semantics_iterator semantics_end() const { 4468 return getSubExprsBuffer() + getNumSubExprs(); 4469 } 4470 Expr *getSemanticExpr(unsigned index) { 4471 assert(index + 1 < getNumSubExprs()); 4472 return getSubExprsBuffer()[index + 1]; 4473 } 4474 const Expr *getSemanticExpr(unsigned index) const { 4475 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 4476 } 4477 4478 SourceLocation getExprLoc() const { 4479 return getSyntacticForm()->getExprLoc(); 4480 } 4481 SourceRange getSourceRange() const { 4482 return getSyntacticForm()->getSourceRange(); 4483 } 4484 4485 child_range children() { 4486 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer()); 4487 return child_range(cs, cs + getNumSubExprs()); 4488 } 4489 4490 static bool classof(const Stmt *T) { 4491 return T->getStmtClass() == PseudoObjectExprClass; 4492 } 4493 static bool classof(const PseudoObjectExpr *) { return true; } 4494}; 4495 4496/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4497/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4498/// similarly-named C++0x instructions. All of these instructions take one 4499/// primary pointer and at least one memory order. 4500class AtomicExpr : public Expr { 4501public: 4502 enum AtomicOp { Load, Store, CmpXchgStrong, CmpXchgWeak, Xchg, 4503 Add, Sub, And, Or, Xor, Init }; 4504private: 4505 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, END_EXPR }; 4506 Stmt* SubExprs[END_EXPR]; 4507 unsigned NumSubExprs; 4508 SourceLocation BuiltinLoc, RParenLoc; 4509 AtomicOp Op; 4510 4511public: 4512 AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, QualType t, 4513 AtomicOp op, SourceLocation RP); 4514 4515 /// \brief Build an empty AtomicExpr. 4516 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4517 4518 Expr *getPtr() const { 4519 return cast<Expr>(SubExprs[PTR]); 4520 } 4521 void setPtr(Expr *E) { 4522 SubExprs[PTR] = E; 4523 } 4524 Expr *getOrder() const { 4525 return cast<Expr>(SubExprs[ORDER]); 4526 } 4527 void setOrder(Expr *E) { 4528 SubExprs[ORDER] = E; 4529 } 4530 Expr *getVal1() const { 4531 if (Op == Init) 4532 return cast<Expr>(SubExprs[ORDER]); 4533 assert(NumSubExprs >= 3); 4534 return cast<Expr>(SubExprs[VAL1]); 4535 } 4536 void setVal1(Expr *E) { 4537 if (Op == Init) { 4538 SubExprs[ORDER] = E; 4539 return; 4540 } 4541 assert(NumSubExprs >= 3); 4542 SubExprs[VAL1] = E; 4543 } 4544 Expr *getOrderFail() const { 4545 assert(NumSubExprs == 5); 4546 return cast<Expr>(SubExprs[ORDER_FAIL]); 4547 } 4548 void setOrderFail(Expr *E) { 4549 assert(NumSubExprs == 5); 4550 SubExprs[ORDER_FAIL] = E; 4551 } 4552 Expr *getVal2() const { 4553 assert(NumSubExprs == 5); 4554 return cast<Expr>(SubExprs[VAL2]); 4555 } 4556 void setVal2(Expr *E) { 4557 assert(NumSubExprs == 5); 4558 SubExprs[VAL2] = E; 4559 } 4560 4561 AtomicOp getOp() const { return Op; } 4562 void setOp(AtomicOp op) { Op = op; } 4563 unsigned getNumSubExprs() { return NumSubExprs; } 4564 void setNumSubExprs(unsigned num) { NumSubExprs = num; } 4565 4566 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4567 4568 bool isVolatile() const { 4569 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4570 } 4571 4572 bool isCmpXChg() const { 4573 return getOp() == AtomicExpr::CmpXchgStrong || 4574 getOp() == AtomicExpr::CmpXchgWeak; 4575 } 4576 4577 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4578 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 4579 4580 SourceLocation getRParenLoc() const { return RParenLoc; } 4581 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 4582 4583 SourceRange getSourceRange() const { 4584 return SourceRange(BuiltinLoc, RParenLoc); 4585 } 4586 static bool classof(const Stmt *T) { 4587 return T->getStmtClass() == AtomicExprClass; 4588 } 4589 static bool classof(const AtomicExpr *) { return true; } 4590 4591 // Iterators 4592 child_range children() { 4593 return child_range(SubExprs, SubExprs+NumSubExprs); 4594 } 4595}; 4596} // end namespace clang 4597 4598#endif 4599