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 "llvm/Support/Compiler.h" 31 #include <cctype> 32 33 namespace clang { 34 class ASTContext; 35 class APValue; 36 class Decl; 37 class IdentifierInfo; 38 class ParmVarDecl; 39 class NamedDecl; 40 class ValueDecl; 41 class BlockDecl; 42 class CXXBaseSpecifier; 43 class CXXOperatorCallExpr; 44 class CXXMemberCallExpr; 45 class ObjCPropertyRefExpr; 46 class OpaqueValueExpr; 47 48 /// \brief A simple array of base specifiers. 49 typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 50 51 /// Expr - This represents one expression. Note that Expr's are subclasses of 52 /// Stmt. This allows an expression to be transparently used any place a Stmt 53 /// is required. 54 /// 55 class Expr : public Stmt { 56 QualType TR; 57 58 protected: 59 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 60 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 61 : Stmt(SC) 62 { 63 ExprBits.TypeDependent = TD; 64 ExprBits.ValueDependent = VD; 65 ExprBits.InstantiationDependent = ID; 66 ExprBits.ValueKind = VK; 67 ExprBits.ObjectKind = OK; 68 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 69 setType(T); 70 } 71 72 /// \brief Construct an empty expression. 73 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 74 75 public: 76 QualType getType() const { return TR; } 77 void setType(QualType t) { 78 // In C++, the type of an expression is always adjusted so that it 79 // will not have reference type an expression will never have 80 // reference type (C++ [expr]p6). Use 81 // QualType::getNonReferenceType() to retrieve the non-reference 82 // type. Additionally, inspect Expr::isLvalue to determine whether 83 // an expression that is adjusted in this manner should be 84 // considered an lvalue. 85 assert((t.isNull() || !t->isReferenceType()) && 86 "Expressions can't have reference type"); 87 88 TR = t; 89 } 90 91 /// isValueDependent - Determines whether this expression is 92 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 93 /// array bound of "Chars" in the following example is 94 /// value-dependent. 95 /// @code 96 /// template<int Size, char (&Chars)[Size]> struct meta_string; 97 /// @endcode 98 bool isValueDependent() const { return ExprBits.ValueDependent; } 99 100 /// \brief Set whether this expression is value-dependent or not. 101 void setValueDependent(bool VD) { 102 ExprBits.ValueDependent = VD; 103 if (VD) 104 ExprBits.InstantiationDependent = true; 105 } 106 107 /// isTypeDependent - Determines whether this expression is 108 /// type-dependent (C++ [temp.dep.expr]), which means that its type 109 /// could change from one template instantiation to the next. For 110 /// example, the expressions "x" and "x + y" are type-dependent in 111 /// the following code, but "y" is not type-dependent: 112 /// @code 113 /// template<typename T> 114 /// void add(T x, int y) { 115 /// x + y; 116 /// } 117 /// @endcode 118 bool isTypeDependent() const { return ExprBits.TypeDependent; } 119 120 /// \brief Set whether this expression is type-dependent or not. 121 void setTypeDependent(bool TD) { 122 ExprBits.TypeDependent = TD; 123 if (TD) 124 ExprBits.InstantiationDependent = true; 125 } 126 127 /// \brief Whether this expression is instantiation-dependent, meaning that 128 /// it depends in some way on a template parameter, even if neither its type 129 /// nor (constant) value can change due to the template instantiation. 130 /// 131 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 132 /// instantiation-dependent (since it involves a template parameter \c T), but 133 /// is neither type- nor value-dependent, since the type of the inner 134 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 135 /// \c sizeof is known. 136 /// 137 /// \code 138 /// template<typename T> 139 /// void f(T x, T y) { 140 /// sizeof(sizeof(T() + T()); 141 /// } 142 /// \endcode 143 /// 144 bool isInstantiationDependent() const { 145 return ExprBits.InstantiationDependent; 146 } 147 148 /// \brief Set whether this expression is instantiation-dependent or not. 149 void setInstantiationDependent(bool ID) { 150 ExprBits.InstantiationDependent = ID; 151 } 152 153 /// \brief Whether this expression contains an unexpanded parameter 154 /// pack (for C++0x variadic templates). 155 /// 156 /// Given the following function template: 157 /// 158 /// \code 159 /// template<typename F, typename ...Types> 160 /// void forward(const F &f, Types &&...args) { 161 /// f(static_cast<Types&&>(args)...); 162 /// } 163 /// \endcode 164 /// 165 /// The expressions \c args and \c static_cast<Types&&>(args) both 166 /// contain parameter packs. 167 bool containsUnexpandedParameterPack() const { 168 return ExprBits.ContainsUnexpandedParameterPack; 169 } 170 171 /// \brief Set the bit that describes whether this expression 172 /// contains an unexpanded parameter pack. 173 void setContainsUnexpandedParameterPack(bool PP = true) { 174 ExprBits.ContainsUnexpandedParameterPack = PP; 175 } 176 177 /// getExprLoc - Return the preferred location for the arrow when diagnosing 178 /// a problem with a generic expression. 179 SourceLocation getExprLoc() const LLVM_READONLY; 180 181 /// isUnusedResultAWarning - Return true if this immediate expression should 182 /// be warned about if the result is unused. If so, fill in Loc and Ranges 183 /// with location to warn on and the source range[s] to report with the 184 /// warning. 185 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 186 SourceRange &R2, ASTContext &Ctx) const; 187 188 /// isLValue - True if this expression is an "l-value" according to 189 /// the rules of the current language. C and C++ give somewhat 190 /// different rules for this concept, but in general, the result of 191 /// an l-value expression identifies a specific object whereas the 192 /// result of an r-value expression is a value detached from any 193 /// specific storage. 194 /// 195 /// C++0x divides the concept of "r-value" into pure r-values 196 /// ("pr-values") and so-called expiring values ("x-values"), which 197 /// identify specific objects that can be safely cannibalized for 198 /// their resources. This is an unfortunate abuse of terminology on 199 /// the part of the C++ committee. In Clang, when we say "r-value", 200 /// we generally mean a pr-value. 201 bool isLValue() const { return getValueKind() == VK_LValue; } 202 bool isRValue() const { return getValueKind() == VK_RValue; } 203 bool isXValue() const { return getValueKind() == VK_XValue; } 204 bool isGLValue() const { return getValueKind() != VK_RValue; } 205 206 enum LValueClassification { 207 LV_Valid, 208 LV_NotObjectType, 209 LV_IncompleteVoidType, 210 LV_DuplicateVectorComponents, 211 LV_InvalidExpression, 212 LV_InvalidMessageExpression, 213 LV_MemberFunction, 214 LV_SubObjCPropertySetting, 215 LV_ClassTemporary 216 }; 217 /// Reasons why an expression might not be an l-value. 218 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 219 220 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 221 /// does not have an incomplete type, does not have a const-qualified type, 222 /// and if it is a structure or union, does not have any member (including, 223 /// recursively, any member or element of all contained aggregates or unions) 224 /// with a const-qualified type. 225 /// 226 /// \param Loc [in] [out] - A source location which *may* be filled 227 /// in with the location of the expression making this a 228 /// non-modifiable lvalue, if specified. 229 enum isModifiableLvalueResult { 230 MLV_Valid, 231 MLV_NotObjectType, 232 MLV_IncompleteVoidType, 233 MLV_DuplicateVectorComponents, 234 MLV_InvalidExpression, 235 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 236 MLV_IncompleteType, 237 MLV_ConstQualified, 238 MLV_ArrayType, 239 MLV_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_NoSetterProperty,// Implicit assignment to ObjC property without setter 275 CM_ConstQualified, 276 CM_ArrayType, 277 CM_IncompleteType 278 }; 279 280 private: 281 friend class Expr; 282 283 unsigned short Kind; 284 unsigned short Modifiable; 285 286 explicit Classification(Kinds k, ModifiableType m) 287 : Kind(k), Modifiable(m) 288 {} 289 290 public: 291 Classification() {} 292 293 Kinds getKind() const { return static_cast<Kinds>(Kind); } 294 ModifiableType getModifiable() const { 295 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 296 return static_cast<ModifiableType>(Modifiable); 297 } 298 bool isLValue() const { return Kind == CL_LValue; } 299 bool isXValue() const { return Kind == CL_XValue; } 300 bool isGLValue() const { return Kind <= CL_XValue; } 301 bool isPRValue() const { return Kind >= CL_Function; } 302 bool isRValue() const { return Kind >= CL_XValue; } 303 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 304 305 /// \brief Create a simple, modifiably lvalue 306 static Classification makeSimpleLValue() { 307 return Classification(CL_LValue, CM_Modifiable); 308 } 309 310 }; 311 /// \brief Classify - Classify this expression according to the C++0x 312 /// expression taxonomy. 313 /// 314 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 315 /// old lvalue vs rvalue. This function determines the type of expression this 316 /// is. There are three expression types: 317 /// - lvalues are classical lvalues as in C++03. 318 /// - prvalues are equivalent to rvalues in C++03. 319 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 320 /// function returning an rvalue reference. 321 /// lvalues and xvalues are collectively referred to as glvalues, while 322 /// prvalues and xvalues together form rvalues. 323 Classification Classify(ASTContext &Ctx) const { 324 return ClassifyImpl(Ctx, 0); 325 } 326 327 /// \brief ClassifyModifiable - Classify this expression according to the 328 /// C++0x expression taxonomy, and see if it is valid on the left side 329 /// of an assignment. 330 /// 331 /// This function extends classify in that it also tests whether the 332 /// expression is modifiable (C99 6.3.2.1p1). 333 /// \param Loc A source location that might be filled with a relevant location 334 /// if the expression is not modifiable. 335 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 336 return ClassifyImpl(Ctx, &Loc); 337 } 338 339 /// getValueKindForType - Given a formal return or parameter type, 340 /// give its value kind. 341 static ExprValueKind getValueKindForType(QualType T) { 342 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 343 return (isa<LValueReferenceType>(RT) 344 ? VK_LValue 345 : (RT->getPointeeType()->isFunctionType() 346 ? VK_LValue : VK_XValue)); 347 return VK_RValue; 348 } 349 350 /// getValueKind - The value kind that this expression produces. 351 ExprValueKind getValueKind() const { 352 return static_cast<ExprValueKind>(ExprBits.ValueKind); 353 } 354 355 /// getObjectKind - The object kind that this expression produces. 356 /// Object kinds are meaningful only for expressions that yield an 357 /// l-value or x-value. 358 ExprObjectKind getObjectKind() const { 359 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 360 } 361 362 bool isOrdinaryOrBitFieldObject() const { 363 ExprObjectKind OK = getObjectKind(); 364 return (OK == OK_Ordinary || OK == OK_BitField); 365 } 366 367 /// setValueKind - Set the value kind produced by this expression. 368 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 369 370 /// setObjectKind - Set the object kind produced by this expression. 371 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 372 373 private: 374 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 375 376 public: 377 378 /// \brief If this expression refers to a bit-field, retrieve the 379 /// declaration of that bit-field. 380 FieldDecl *getBitField(); 381 382 const FieldDecl *getBitField() const { 383 return const_cast<Expr*>(this)->getBitField(); 384 } 385 386 /// \brief If this expression is an l-value for an Objective C 387 /// property, find the underlying property reference expression. 388 const ObjCPropertyRefExpr *getObjCProperty() const; 389 390 /// \brief Returns whether this expression refers to a vector element. 391 bool refersToVectorElement() const; 392 393 /// \brief Returns whether this expression has a placeholder type. 394 bool hasPlaceholderType() const { 395 return getType()->isPlaceholderType(); 396 } 397 398 /// \brief Returns whether this expression has a specific placeholder type. 399 bool hasPlaceholderType(BuiltinType::Kind K) const { 400 assert(BuiltinType::isPlaceholderTypeKind(K)); 401 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 402 return BT->getKind() == K; 403 return false; 404 } 405 406 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 407 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 408 /// but also int expressions which are produced by things like comparisons in 409 /// C. 410 bool isKnownToHaveBooleanValue() const; 411 412 /// isIntegerConstantExpr - Return true if this expression is a valid integer 413 /// constant expression, and, if so, return its value in Result. If not a 414 /// valid i-c-e, return false and fill in Loc (if specified) with the location 415 /// of the invalid expression. 416 /// 417 /// Note: This does not perform the implicit conversions required by C++11 418 /// [expr.const]p5. 419 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 420 SourceLocation *Loc = 0, 421 bool isEvaluated = true) const; 422 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const; 423 424 /// isCXX98IntegralConstantExpr - Return true if this expression is an 425 /// integral constant expression in C++98. Can only be used in C++. 426 bool isCXX98IntegralConstantExpr(ASTContext &Ctx) const; 427 428 /// isCXX11ConstantExpr - Return true if this expression is a constant 429 /// expression in C++11. Can only be used in C++. 430 /// 431 /// Note: This does not perform the implicit conversions required by C++11 432 /// [expr.const]p5. 433 bool isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result = 0, 434 SourceLocation *Loc = 0) const; 435 436 /// isPotentialConstantExpr - Return true if this function's definition 437 /// might be usable in a constant expression in C++11, if it were marked 438 /// constexpr. Return false if the function can never produce a constant 439 /// expression, along with diagnostics describing why not. 440 static bool isPotentialConstantExpr(const FunctionDecl *FD, 441 llvm::SmallVectorImpl< 442 PartialDiagnosticAt> &Diags); 443 444 /// isConstantInitializer - Returns true if this expression can be emitted to 445 /// IR as a constant, and thus can be used as a constant initializer in C. 446 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 447 448 /// EvalStatus is a struct with detailed info about an evaluation in progress. 449 struct EvalStatus { 450 /// HasSideEffects - Whether the evaluated expression has side effects. 451 /// For example, (f() && 0) can be folded, but it still has side effects. 452 bool HasSideEffects; 453 454 /// Diag - If this is non-null, it will be filled in with a stack of notes 455 /// indicating why evaluation failed (or why it failed to produce a constant 456 /// expression). 457 /// If the expression is unfoldable, the notes will indicate why it's not 458 /// foldable. If the expression is foldable, but not a constant expression, 459 /// the notes will describes why it isn't a constant expression. If the 460 /// expression *is* a constant expression, no notes will be produced. 461 llvm::SmallVectorImpl<PartialDiagnosticAt> *Diag; 462 463 EvalStatus() : HasSideEffects(false), Diag(0) {} 464 465 // hasSideEffects - Return true if the evaluated expression has 466 // side effects. 467 bool hasSideEffects() const { 468 return HasSideEffects; 469 } 470 }; 471 472 /// EvalResult is a struct with detailed info about an evaluated expression. 473 struct EvalResult : EvalStatus { 474 /// Val - This is the value the expression can be folded to. 475 APValue Val; 476 477 // isGlobalLValue - Return true if the evaluated lvalue expression 478 // is global. 479 bool isGlobalLValue() const; 480 }; 481 482 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 483 /// an rvalue using any crazy technique (that has nothing to do with language 484 /// standards) that we want to, even if the expression has side-effects. If 485 /// this function returns true, it returns the folded constant in Result. If 486 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 487 /// applied. 488 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 489 490 /// EvaluateAsBooleanCondition - Return true if this is a constant 491 /// which we we can fold and convert to a boolean condition using 492 /// any crazy technique that we want to, even if the expression has 493 /// side-effects. 494 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 495 496 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects }; 497 498 /// EvaluateAsInt - Return true if this is a constant which we can fold and 499 /// convert to an integer, using any crazy technique that we want to. 500 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 501 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 502 503 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 504 /// constant folded without side-effects, but discard the result. 505 bool isEvaluatable(const ASTContext &Ctx) const; 506 507 /// HasSideEffects - This routine returns true for all those expressions 508 /// which must be evaluated each time and must not be optimized away 509 /// or evaluated at compile time. Example is a function call, volatile 510 /// variable read. 511 bool HasSideEffects(const ASTContext &Ctx) const; 512 513 /// \brief Determine whether this expression involves a call to any function 514 /// that is not trivial. 515 bool hasNonTrivialCall(ASTContext &Ctx); 516 517 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 518 /// integer. This must be called on an expression that constant folds to an 519 /// integer. 520 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 521 522 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 523 /// lvalue with link time known address, with no side-effects. 524 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 525 526 /// EvaluateAsInitializer - Evaluate an expression as if it were the 527 /// initializer of the given declaration. Returns true if the initializer 528 /// can be folded to a constant, and produces any relevant notes. In C++11, 529 /// notes will be produced if the expression is not a constant expression. 530 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 531 const VarDecl *VD, 532 llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 533 534 /// \brief Enumeration used to describe the kind of Null pointer constant 535 /// returned from \c isNullPointerConstant(). 536 enum NullPointerConstantKind { 537 /// \brief Expression is not a Null pointer constant. 538 NPCK_NotNull = 0, 539 540 /// \brief Expression is a Null pointer constant built from a zero integer. 541 NPCK_ZeroInteger, 542 543 /// \brief Expression is a C++0X nullptr. 544 NPCK_CXX0X_nullptr, 545 546 /// \brief Expression is a GNU-style __null constant. 547 NPCK_GNUNull 548 }; 549 550 /// \brief Enumeration used to describe how \c isNullPointerConstant() 551 /// should cope with value-dependent expressions. 552 enum NullPointerConstantValueDependence { 553 /// \brief Specifies that the expression should never be value-dependent. 554 NPC_NeverValueDependent = 0, 555 556 /// \brief Specifies that a value-dependent expression of integral or 557 /// dependent type should be considered a null pointer constant. 558 NPC_ValueDependentIsNull, 559 560 /// \brief Specifies that a value-dependent expression should be considered 561 /// to never be a null pointer constant. 562 NPC_ValueDependentIsNotNull 563 }; 564 565 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 566 /// a Null pointer constant. The return value can further distinguish the 567 /// kind of NULL pointer constant that was detected. 568 NullPointerConstantKind isNullPointerConstant( 569 ASTContext &Ctx, 570 NullPointerConstantValueDependence NPC) const; 571 572 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 573 /// write barrier. 574 bool isOBJCGCCandidate(ASTContext &Ctx) const; 575 576 /// \brief Returns true if this expression is a bound member function. 577 bool isBoundMemberFunction(ASTContext &Ctx) const; 578 579 /// \brief Given an expression of bound-member type, find the type 580 /// of the member. Returns null if this is an *overloaded* bound 581 /// member expression. 582 static QualType findBoundMemberType(const Expr *expr); 583 584 /// IgnoreImpCasts - Skip past any implicit casts which might 585 /// surround this expression. Only skips ImplicitCastExprs. 586 Expr *IgnoreImpCasts() LLVM_READONLY; 587 588 /// IgnoreImplicit - Skip past any implicit AST nodes which might 589 /// surround this expression. 590 Expr *IgnoreImplicit() LLVM_READONLY { 591 return cast<Expr>(Stmt::IgnoreImplicit()); 592 } 593 594 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 595 /// its subexpression. If that subexpression is also a ParenExpr, 596 /// then this method recursively returns its subexpression, and so forth. 597 /// Otherwise, the method returns the current Expr. 598 Expr *IgnoreParens() LLVM_READONLY; 599 600 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 601 /// or CastExprs, returning their operand. 602 Expr *IgnoreParenCasts() LLVM_READONLY; 603 604 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 605 /// any ParenExpr or ImplicitCastExprs, returning their operand. 606 Expr *IgnoreParenImpCasts() LLVM_READONLY; 607 608 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 609 /// call to a conversion operator, return the argument. 610 Expr *IgnoreConversionOperator() LLVM_READONLY; 611 612 const Expr *IgnoreConversionOperator() const LLVM_READONLY { 613 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 614 } 615 616 const Expr *IgnoreParenImpCasts() const LLVM_READONLY { 617 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 618 } 619 620 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 621 /// CastExprs that represent lvalue casts, returning their operand. 622 Expr *IgnoreParenLValueCasts() LLVM_READONLY; 623 624 const Expr *IgnoreParenLValueCasts() const LLVM_READONLY { 625 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 626 } 627 628 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 629 /// value (including ptr->int casts of the same size). Strip off any 630 /// ParenExpr or CastExprs, returning their operand. 631 Expr *IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY; 632 633 /// \brief Determine whether this expression is a default function argument. 634 /// 635 /// Default arguments are implicitly generated in the abstract syntax tree 636 /// by semantic analysis for function calls, object constructions, etc. in 637 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 638 /// this routine also looks through any implicit casts to determine whether 639 /// the expression is a default argument. 640 bool isDefaultArgument() const; 641 642 /// \brief Determine whether the result of this expression is a 643 /// temporary object of the given class type. 644 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 645 646 /// \brief Whether this expression is an implicit reference to 'this' in C++. 647 bool isImplicitCXXThis() const; 648 649 const Expr *IgnoreImpCasts() const LLVM_READONLY { 650 return const_cast<Expr*>(this)->IgnoreImpCasts(); 651 } 652 const Expr *IgnoreParens() const LLVM_READONLY { 653 return const_cast<Expr*>(this)->IgnoreParens(); 654 } 655 const Expr *IgnoreParenCasts() const LLVM_READONLY { 656 return const_cast<Expr*>(this)->IgnoreParenCasts(); 657 } 658 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const LLVM_READONLY { 659 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 660 } 661 662 static bool hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs); 663 664 static bool classof(const Stmt *T) { 665 return T->getStmtClass() >= firstExprConstant && 666 T->getStmtClass() <= lastExprConstant; 667 } 668 static bool classof(const Expr *) { return true; } 669 }; 670 671 672 //===----------------------------------------------------------------------===// 673 // Primary Expressions. 674 //===----------------------------------------------------------------------===// 675 676 /// OpaqueValueExpr - An expression referring to an opaque object of a 677 /// fixed type and value class. These don't correspond to concrete 678 /// syntax; instead they're used to express operations (usually copy 679 /// operations) on values whose source is generally obvious from 680 /// context. 681 class OpaqueValueExpr : public Expr { 682 friend class ASTStmtReader; 683 Expr *SourceExpr; 684 SourceLocation Loc; 685 686 public: 687 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 688 ExprObjectKind OK = OK_Ordinary, 689 Expr *SourceExpr = 0) 690 : Expr(OpaqueValueExprClass, T, VK, OK, 691 T->isDependentType(), 692 T->isDependentType() || 693 (SourceExpr && SourceExpr->isValueDependent()), 694 T->isInstantiationDependentType(), 695 false), 696 SourceExpr(SourceExpr), Loc(Loc) { 697 } 698 699 /// Given an expression which invokes a copy constructor --- i.e. a 700 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 701 /// find the OpaqueValueExpr that's the source of the construction. 702 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 703 704 explicit OpaqueValueExpr(EmptyShell Empty) 705 : Expr(OpaqueValueExprClass, Empty) { } 706 707 /// \brief Retrieve the location of this expression. 708 SourceLocation getLocation() const { return Loc; } 709 710 SourceRange getSourceRange() const LLVM_READONLY { 711 if (SourceExpr) return SourceExpr->getSourceRange(); 712 return Loc; 713 } 714 SourceLocation getExprLoc() const LLVM_READONLY { 715 if (SourceExpr) return SourceExpr->getExprLoc(); 716 return Loc; 717 } 718 719 child_range children() { return child_range(); } 720 721 /// The source expression of an opaque value expression is the 722 /// expression which originally generated the value. This is 723 /// provided as a convenience for analyses that don't wish to 724 /// precisely model the execution behavior of the program. 725 /// 726 /// The source expression is typically set when building the 727 /// expression which binds the opaque value expression in the first 728 /// place. 729 Expr *getSourceExpr() const { return SourceExpr; } 730 731 static bool classof(const Stmt *T) { 732 return T->getStmtClass() == OpaqueValueExprClass; 733 } 734 static bool classof(const OpaqueValueExpr *) { return true; } 735 }; 736 737 /// \brief A reference to a declared variable, function, enum, etc. 738 /// [C99 6.5.1p2] 739 /// 740 /// This encodes all the information about how a declaration is referenced 741 /// within an expression. 742 /// 743 /// There are several optional constructs attached to DeclRefExprs only when 744 /// they apply in order to conserve memory. These are laid out past the end of 745 /// the object, and flags in the DeclRefExprBitfield track whether they exist: 746 /// 747 /// DeclRefExprBits.HasQualifier: 748 /// Specifies when this declaration reference expression has a C++ 749 /// nested-name-specifier. 750 /// DeclRefExprBits.HasFoundDecl: 751 /// Specifies when this declaration reference expression has a record of 752 /// a NamedDecl (different from the referenced ValueDecl) which was found 753 /// during name lookup and/or overload resolution. 754 /// DeclRefExprBits.HasTemplateKWAndArgsInfo: 755 /// Specifies when this declaration reference expression has an explicit 756 /// C++ template keyword and/or template argument list. 757 /// DeclRefExprBits.RefersToEnclosingLocal 758 /// Specifies when this declaration reference expression (validly) 759 /// refers to a local variable from a different function. 760 class DeclRefExpr : public Expr { 761 /// \brief The declaration that we are referencing. 762 ValueDecl *D; 763 764 /// \brief The location of the declaration name itself. 765 SourceLocation Loc; 766 767 /// \brief Provides source/type location info for the declaration name 768 /// embedded in D. 769 DeclarationNameLoc DNLoc; 770 771 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 772 NestedNameSpecifierLoc &getInternalQualifierLoc() { 773 assert(hasQualifier()); 774 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 775 } 776 777 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 778 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 779 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 780 } 781 782 /// \brief Test whether there is a distinct FoundDecl attached to the end of 783 /// this DRE. 784 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 785 786 /// \brief Helper to retrieve the optional NamedDecl through which this 787 /// reference occured. 788 NamedDecl *&getInternalFoundDecl() { 789 assert(hasFoundDecl()); 790 if (hasQualifier()) 791 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 792 return *reinterpret_cast<NamedDecl **>(this + 1); 793 } 794 795 /// \brief Helper to retrieve the optional NamedDecl through which this 796 /// reference occured. 797 NamedDecl *getInternalFoundDecl() const { 798 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 799 } 800 801 DeclRefExpr(ASTContext &Ctx, 802 NestedNameSpecifierLoc QualifierLoc, 803 SourceLocation TemplateKWLoc, 804 ValueDecl *D, bool refersToEnclosingLocal, 805 const DeclarationNameInfo &NameInfo, 806 NamedDecl *FoundD, 807 const TemplateArgumentListInfo *TemplateArgs, 808 QualType T, ExprValueKind VK); 809 810 /// \brief Construct an empty declaration reference expression. 811 explicit DeclRefExpr(EmptyShell Empty) 812 : Expr(DeclRefExprClass, Empty) { } 813 814 /// \brief Computes the type- and value-dependence flags for this 815 /// declaration reference expression. 816 void computeDependence(ASTContext &C); 817 818 public: 819 DeclRefExpr(ValueDecl *D, bool refersToEnclosingLocal, QualType T, 820 ExprValueKind VK, SourceLocation L, 821 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 822 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 823 D(D), Loc(L), DNLoc(LocInfo) { 824 DeclRefExprBits.HasQualifier = 0; 825 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 826 DeclRefExprBits.HasFoundDecl = 0; 827 DeclRefExprBits.HadMultipleCandidates = 0; 828 DeclRefExprBits.RefersToEnclosingLocal = refersToEnclosingLocal; 829 computeDependence(D->getASTContext()); 830 } 831 832 static DeclRefExpr *Create(ASTContext &Context, 833 NestedNameSpecifierLoc QualifierLoc, 834 SourceLocation TemplateKWLoc, 835 ValueDecl *D, 836 bool isEnclosingLocal, 837 SourceLocation NameLoc, 838 QualType T, ExprValueKind VK, 839 NamedDecl *FoundD = 0, 840 const TemplateArgumentListInfo *TemplateArgs = 0); 841 842 static DeclRefExpr *Create(ASTContext &Context, 843 NestedNameSpecifierLoc QualifierLoc, 844 SourceLocation TemplateKWLoc, 845 ValueDecl *D, 846 bool isEnclosingLocal, 847 const DeclarationNameInfo &NameInfo, 848 QualType T, ExprValueKind VK, 849 NamedDecl *FoundD = 0, 850 const TemplateArgumentListInfo *TemplateArgs = 0); 851 852 /// \brief Construct an empty declaration reference expression. 853 static DeclRefExpr *CreateEmpty(ASTContext &Context, 854 bool HasQualifier, 855 bool HasFoundDecl, 856 bool HasTemplateKWAndArgsInfo, 857 unsigned NumTemplateArgs); 858 859 ValueDecl *getDecl() { return D; } 860 const ValueDecl *getDecl() const { return D; } 861 void setDecl(ValueDecl *NewD) { D = NewD; } 862 863 DeclarationNameInfo getNameInfo() const { 864 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 865 } 866 867 SourceLocation getLocation() const { return Loc; } 868 void setLocation(SourceLocation L) { Loc = L; } 869 SourceRange getSourceRange() const LLVM_READONLY; 870 SourceLocation getLocStart() const LLVM_READONLY; 871 SourceLocation getLocEnd() const LLVM_READONLY; 872 873 /// \brief Determine whether this declaration reference was preceded by a 874 /// C++ nested-name-specifier, e.g., \c N::foo. 875 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 876 877 /// \brief If the name was qualified, retrieves the nested-name-specifier 878 /// that precedes the name. Otherwise, returns NULL. 879 NestedNameSpecifier *getQualifier() const { 880 if (!hasQualifier()) 881 return 0; 882 883 return getInternalQualifierLoc().getNestedNameSpecifier(); 884 } 885 886 /// \brief If the name was qualified, retrieves the nested-name-specifier 887 /// that precedes the name, with source-location information. 888 NestedNameSpecifierLoc getQualifierLoc() const { 889 if (!hasQualifier()) 890 return NestedNameSpecifierLoc(); 891 892 return getInternalQualifierLoc(); 893 } 894 895 /// \brief Get the NamedDecl through which this reference occured. 896 /// 897 /// This Decl may be different from the ValueDecl actually referred to in the 898 /// presence of using declarations, etc. It always returns non-NULL, and may 899 /// simple return the ValueDecl when appropriate. 900 NamedDecl *getFoundDecl() { 901 return hasFoundDecl() ? getInternalFoundDecl() : D; 902 } 903 904 /// \brief Get the NamedDecl through which this reference occurred. 905 /// See non-const variant. 906 const NamedDecl *getFoundDecl() const { 907 return hasFoundDecl() ? getInternalFoundDecl() : D; 908 } 909 910 bool hasTemplateKWAndArgsInfo() const { 911 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 912 } 913 914 /// \brief Return the optional template keyword and arguments info. 915 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 916 if (!hasTemplateKWAndArgsInfo()) 917 return 0; 918 919 if (hasFoundDecl()) 920 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 921 &getInternalFoundDecl() + 1); 922 923 if (hasQualifier()) 924 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 925 &getInternalQualifierLoc() + 1); 926 927 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 928 } 929 930 /// \brief Return the optional template keyword and arguments info. 931 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 932 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo(); 933 } 934 935 /// \brief Retrieve the location of the template keyword preceding 936 /// this name, if any. 937 SourceLocation getTemplateKeywordLoc() const { 938 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 939 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 940 } 941 942 /// \brief Retrieve the location of the left angle bracket starting the 943 /// explicit template argument list following the name, if any. 944 SourceLocation getLAngleLoc() const { 945 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 946 return getTemplateKWAndArgsInfo()->LAngleLoc; 947 } 948 949 /// \brief Retrieve the location of the right angle bracket ending the 950 /// explicit template argument list following the name, if any. 951 SourceLocation getRAngleLoc() const { 952 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 953 return getTemplateKWAndArgsInfo()->RAngleLoc; 954 } 955 956 /// \brief Determines whether the name in this declaration reference 957 /// was preceded by the template keyword. 958 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 959 960 /// \brief Determines whether this declaration reference was followed by an 961 /// explicit template argument list. 962 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 963 964 /// \brief Retrieve the explicit template argument list that followed the 965 /// member template name. 966 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 967 assert(hasExplicitTemplateArgs()); 968 return *getTemplateKWAndArgsInfo(); 969 } 970 971 /// \brief Retrieve the explicit template argument list that followed the 972 /// member template name. 973 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 974 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 975 } 976 977 /// \brief Retrieves the optional explicit template arguments. 978 /// This points to the same data as getExplicitTemplateArgs(), but 979 /// returns null if there are no explicit template arguments. 980 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 981 if (!hasExplicitTemplateArgs()) return 0; 982 return &getExplicitTemplateArgs(); 983 } 984 985 /// \brief Copies the template arguments (if present) into the given 986 /// structure. 987 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 988 if (hasExplicitTemplateArgs()) 989 getExplicitTemplateArgs().copyInto(List); 990 } 991 992 /// \brief Retrieve the template arguments provided as part of this 993 /// template-id. 994 const TemplateArgumentLoc *getTemplateArgs() const { 995 if (!hasExplicitTemplateArgs()) 996 return 0; 997 998 return getExplicitTemplateArgs().getTemplateArgs(); 999 } 1000 1001 /// \brief Retrieve the number of template arguments provided as part of this 1002 /// template-id. 1003 unsigned getNumTemplateArgs() const { 1004 if (!hasExplicitTemplateArgs()) 1005 return 0; 1006 1007 return getExplicitTemplateArgs().NumTemplateArgs; 1008 } 1009 1010 /// \brief Returns true if this expression refers to a function that 1011 /// was resolved from an overloaded set having size greater than 1. 1012 bool hadMultipleCandidates() const { 1013 return DeclRefExprBits.HadMultipleCandidates; 1014 } 1015 /// \brief Sets the flag telling whether this expression refers to 1016 /// a function that was resolved from an overloaded set having size 1017 /// greater than 1. 1018 void setHadMultipleCandidates(bool V = true) { 1019 DeclRefExprBits.HadMultipleCandidates = V; 1020 } 1021 1022 /// Does this DeclRefExpr refer to a local declaration from an 1023 /// enclosing function scope? 1024 bool refersToEnclosingLocal() const { 1025 return DeclRefExprBits.RefersToEnclosingLocal; 1026 } 1027 1028 static bool classof(const Stmt *T) { 1029 return T->getStmtClass() == DeclRefExprClass; 1030 } 1031 static bool classof(const DeclRefExpr *) { return true; } 1032 1033 // Iterators 1034 child_range children() { return child_range(); } 1035 1036 friend class ASTStmtReader; 1037 friend class ASTStmtWriter; 1038 }; 1039 1040 /// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 1041 class PredefinedExpr : public Expr { 1042 public: 1043 enum IdentType { 1044 Func, 1045 Function, 1046 PrettyFunction, 1047 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 1048 /// 'virtual' keyword is omitted for virtual member functions. 1049 PrettyFunctionNoVirtual 1050 }; 1051 1052 private: 1053 SourceLocation Loc; 1054 IdentType Type; 1055 public: 1056 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 1057 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 1058 type->isDependentType(), type->isDependentType(), 1059 type->isInstantiationDependentType(), 1060 /*ContainsUnexpandedParameterPack=*/false), 1061 Loc(l), Type(IT) {} 1062 1063 /// \brief Construct an empty predefined expression. 1064 explicit PredefinedExpr(EmptyShell Empty) 1065 : Expr(PredefinedExprClass, Empty) { } 1066 1067 IdentType getIdentType() const { return Type; } 1068 void setIdentType(IdentType IT) { Type = IT; } 1069 1070 SourceLocation getLocation() const { return Loc; } 1071 void setLocation(SourceLocation L) { Loc = L; } 1072 1073 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1074 1075 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1076 1077 static bool classof(const Stmt *T) { 1078 return T->getStmtClass() == PredefinedExprClass; 1079 } 1080 static bool classof(const PredefinedExpr *) { return true; } 1081 1082 // Iterators 1083 child_range children() { return child_range(); } 1084 }; 1085 1086 /// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1087 /// leaking memory. 1088 /// 1089 /// For large floats/integers, APFloat/APInt will allocate memory from the heap 1090 /// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1091 /// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1092 /// the APFloat/APInt values will never get freed. APNumericStorage uses 1093 /// ASTContext's allocator for memory allocation. 1094 class APNumericStorage { 1095 union { 1096 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1097 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1098 }; 1099 unsigned BitWidth; 1100 1101 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1102 1103 APNumericStorage(const APNumericStorage&); // do not implement 1104 APNumericStorage& operator=(const APNumericStorage&); // do not implement 1105 1106 protected: 1107 APNumericStorage() : VAL(0), BitWidth(0) { } 1108 1109 llvm::APInt getIntValue() const { 1110 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1111 if (NumWords > 1) 1112 return llvm::APInt(BitWidth, NumWords, pVal); 1113 else 1114 return llvm::APInt(BitWidth, VAL); 1115 } 1116 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1117 }; 1118 1119 class APIntStorage : private APNumericStorage { 1120 public: 1121 llvm::APInt getValue() const { return getIntValue(); } 1122 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1123 }; 1124 1125 class APFloatStorage : private APNumericStorage { 1126 public: 1127 llvm::APFloat getValue(bool IsIEEE) const { 1128 return llvm::APFloat(getIntValue(), IsIEEE); 1129 } 1130 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1131 setIntValue(C, Val.bitcastToAPInt()); 1132 } 1133 }; 1134 1135 class IntegerLiteral : public Expr, public APIntStorage { 1136 SourceLocation Loc; 1137 1138 /// \brief Construct an empty integer literal. 1139 explicit IntegerLiteral(EmptyShell Empty) 1140 : Expr(IntegerLiteralClass, Empty) { } 1141 1142 public: 1143 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1144 // or UnsignedLongLongTy 1145 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 1146 QualType type, SourceLocation l) 1147 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1148 false, false), 1149 Loc(l) { 1150 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 1151 assert(V.getBitWidth() == C.getIntWidth(type) && 1152 "Integer type is not the correct size for constant."); 1153 setValue(C, V); 1154 } 1155 1156 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1157 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1158 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1159 /// \param V - the value that the returned integer literal contains. 1160 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1161 QualType type, SourceLocation l); 1162 /// \brief Returns a new empty integer literal. 1163 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1164 1165 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1166 1167 /// \brief Retrieve the location of the literal. 1168 SourceLocation getLocation() const { return Loc; } 1169 1170 void setLocation(SourceLocation Location) { Loc = Location; } 1171 1172 static bool classof(const Stmt *T) { 1173 return T->getStmtClass() == IntegerLiteralClass; 1174 } 1175 static bool classof(const IntegerLiteral *) { return true; } 1176 1177 // Iterators 1178 child_range children() { return child_range(); } 1179 }; 1180 1181 class CharacterLiteral : public Expr { 1182 public: 1183 enum CharacterKind { 1184 Ascii, 1185 Wide, 1186 UTF16, 1187 UTF32 1188 }; 1189 1190 private: 1191 unsigned Value; 1192 SourceLocation Loc; 1193 public: 1194 // type should be IntTy 1195 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1196 SourceLocation l) 1197 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1198 false, false), 1199 Value(value), Loc(l) { 1200 CharacterLiteralBits.Kind = kind; 1201 } 1202 1203 /// \brief Construct an empty character literal. 1204 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1205 1206 SourceLocation getLocation() const { return Loc; } 1207 CharacterKind getKind() const { 1208 return static_cast<CharacterKind>(CharacterLiteralBits.Kind); 1209 } 1210 1211 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1212 1213 unsigned getValue() const { return Value; } 1214 1215 void setLocation(SourceLocation Location) { Loc = Location; } 1216 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; } 1217 void setValue(unsigned Val) { Value = Val; } 1218 1219 static bool classof(const Stmt *T) { 1220 return T->getStmtClass() == CharacterLiteralClass; 1221 } 1222 static bool classof(const CharacterLiteral *) { return true; } 1223 1224 // Iterators 1225 child_range children() { return child_range(); } 1226 }; 1227 1228 class FloatingLiteral : public Expr, private APFloatStorage { 1229 SourceLocation Loc; 1230 1231 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1232 QualType Type, SourceLocation L) 1233 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1234 false, false), Loc(L) { 1235 FloatingLiteralBits.IsIEEE = 1236 &C.getTargetInfo().getLongDoubleFormat() == &llvm::APFloat::IEEEquad; 1237 FloatingLiteralBits.IsExact = isexact; 1238 setValue(C, V); 1239 } 1240 1241 /// \brief Construct an empty floating-point literal. 1242 explicit FloatingLiteral(ASTContext &C, EmptyShell Empty) 1243 : Expr(FloatingLiteralClass, Empty) { 1244 FloatingLiteralBits.IsIEEE = 1245 &C.getTargetInfo().getLongDoubleFormat() == &llvm::APFloat::IEEEquad; 1246 FloatingLiteralBits.IsExact = false; 1247 } 1248 1249 public: 1250 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1251 bool isexact, QualType Type, SourceLocation L); 1252 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1253 1254 llvm::APFloat getValue() const { 1255 return APFloatStorage::getValue(FloatingLiteralBits.IsIEEE); 1256 } 1257 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1258 APFloatStorage::setValue(C, Val); 1259 } 1260 1261 bool isExact() const { return FloatingLiteralBits.IsExact; } 1262 void setExact(bool E) { FloatingLiteralBits.IsExact = E; } 1263 1264 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1265 /// double. Note that this may cause loss of precision, but is useful for 1266 /// debugging dumps, etc. 1267 double getValueAsApproximateDouble() const; 1268 1269 SourceLocation getLocation() const { return Loc; } 1270 void setLocation(SourceLocation L) { Loc = L; } 1271 1272 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1273 1274 static bool classof(const Stmt *T) { 1275 return T->getStmtClass() == FloatingLiteralClass; 1276 } 1277 static bool classof(const FloatingLiteral *) { return true; } 1278 1279 // Iterators 1280 child_range children() { return child_range(); } 1281 }; 1282 1283 /// ImaginaryLiteral - We support imaginary integer and floating point literals, 1284 /// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1285 /// IntegerLiteral classes. Instances of this class always have a Complex type 1286 /// whose element type matches the subexpression. 1287 /// 1288 class ImaginaryLiteral : public Expr { 1289 Stmt *Val; 1290 public: 1291 ImaginaryLiteral(Expr *val, QualType Ty) 1292 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1293 false, false), 1294 Val(val) {} 1295 1296 /// \brief Build an empty imaginary literal. 1297 explicit ImaginaryLiteral(EmptyShell Empty) 1298 : Expr(ImaginaryLiteralClass, Empty) { } 1299 1300 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1301 Expr *getSubExpr() { return cast<Expr>(Val); } 1302 void setSubExpr(Expr *E) { Val = E; } 1303 1304 SourceRange getSourceRange() const LLVM_READONLY { return Val->getSourceRange(); } 1305 static bool classof(const Stmt *T) { 1306 return T->getStmtClass() == ImaginaryLiteralClass; 1307 } 1308 static bool classof(const ImaginaryLiteral *) { return true; } 1309 1310 // Iterators 1311 child_range children() { return child_range(&Val, &Val+1); } 1312 }; 1313 1314 /// StringLiteral - This represents a string literal expression, e.g. "foo" 1315 /// or L"bar" (wide strings). The actual string is returned by getStrData() 1316 /// is NOT null-terminated, and the length of the string is determined by 1317 /// calling getByteLength(). The C type for a string is always a 1318 /// ConstantArrayType. In C++, the char type is const qualified, in C it is 1319 /// not. 1320 /// 1321 /// Note that strings in C can be formed by concatenation of multiple string 1322 /// literal pptokens in translation phase #6. This keeps track of the locations 1323 /// of each of these pieces. 1324 /// 1325 /// Strings in C can also be truncated and extended by assigning into arrays, 1326 /// e.g. with constructs like: 1327 /// char X[2] = "foobar"; 1328 /// In this case, getByteLength() will return 6, but the string literal will 1329 /// have type "char[2]". 1330 class StringLiteral : public Expr { 1331 public: 1332 enum StringKind { 1333 Ascii, 1334 Wide, 1335 UTF8, 1336 UTF16, 1337 UTF32 1338 }; 1339 1340 private: 1341 friend class ASTStmtReader; 1342 1343 union { 1344 const char *asChar; 1345 const uint16_t *asUInt16; 1346 const uint32_t *asUInt32; 1347 } StrData; 1348 unsigned Length; 1349 unsigned CharByteWidth : 4; 1350 unsigned Kind : 3; 1351 unsigned IsPascal : 1; 1352 unsigned NumConcatenated; 1353 SourceLocation TokLocs[1]; 1354 1355 StringLiteral(QualType Ty) : 1356 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1357 false) {} 1358 1359 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1360 1361 public: 1362 /// This is the "fully general" constructor that allows representation of 1363 /// strings formed from multiple concatenated tokens. 1364 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1365 bool Pascal, QualType Ty, 1366 const SourceLocation *Loc, unsigned NumStrs); 1367 1368 /// Simple constructor for string literals made from one token. 1369 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1370 bool Pascal, QualType Ty, 1371 SourceLocation Loc) { 1372 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1373 } 1374 1375 /// \brief Construct an empty string literal. 1376 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1377 1378 StringRef getString() const { 1379 assert(CharByteWidth==1 1380 && "This function is used in places that assume strings use char"); 1381 return StringRef(StrData.asChar, getByteLength()); 1382 } 1383 1384 /// Allow clients that need the byte representation, such as ASTWriterStmt 1385 /// ::VisitStringLiteral(), access. 1386 StringRef getBytes() const { 1387 // FIXME: StringRef may not be the right type to use as a result for this. 1388 if (CharByteWidth == 1) 1389 return StringRef(StrData.asChar, getByteLength()); 1390 if (CharByteWidth == 4) 1391 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1392 getByteLength()); 1393 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1394 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1395 getByteLength()); 1396 } 1397 1398 uint32_t getCodeUnit(size_t i) const { 1399 assert(i < Length && "out of bounds access"); 1400 if (CharByteWidth == 1) 1401 return static_cast<unsigned char>(StrData.asChar[i]); 1402 if (CharByteWidth == 4) 1403 return StrData.asUInt32[i]; 1404 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1405 return StrData.asUInt16[i]; 1406 } 1407 1408 unsigned getByteLength() const { return CharByteWidth*Length; } 1409 unsigned getLength() const { return Length; } 1410 unsigned getCharByteWidth() const { return CharByteWidth; } 1411 1412 /// \brief Sets the string data to the given string data. 1413 void setString(ASTContext &C, StringRef Str, 1414 StringKind Kind, bool IsPascal); 1415 1416 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1417 1418 1419 bool isAscii() const { return Kind == Ascii; } 1420 bool isWide() const { return Kind == Wide; } 1421 bool isUTF8() const { return Kind == UTF8; } 1422 bool isUTF16() const { return Kind == UTF16; } 1423 bool isUTF32() const { return Kind == UTF32; } 1424 bool isPascal() const { return IsPascal; } 1425 1426 bool containsNonAsciiOrNull() const { 1427 StringRef Str = getString(); 1428 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1429 if (!isascii(Str[i]) || !Str[i]) 1430 return true; 1431 return false; 1432 } 1433 1434 /// getNumConcatenated - Get the number of string literal tokens that were 1435 /// concatenated in translation phase #6 to form this string literal. 1436 unsigned getNumConcatenated() const { return NumConcatenated; } 1437 1438 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1439 assert(TokNum < NumConcatenated && "Invalid tok number"); 1440 return TokLocs[TokNum]; 1441 } 1442 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1443 assert(TokNum < NumConcatenated && "Invalid tok number"); 1444 TokLocs[TokNum] = L; 1445 } 1446 1447 /// getLocationOfByte - Return a source location that points to the specified 1448 /// byte of this string literal. 1449 /// 1450 /// Strings are amazingly complex. They can be formed from multiple tokens 1451 /// and can have escape sequences in them in addition to the usual trigraph 1452 /// and escaped newline business. This routine handles this complexity. 1453 /// 1454 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1455 const LangOptions &Features, 1456 const TargetInfo &Target) const; 1457 1458 typedef const SourceLocation *tokloc_iterator; 1459 tokloc_iterator tokloc_begin() const { return TokLocs; } 1460 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1461 1462 SourceRange getSourceRange() const LLVM_READONLY { 1463 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1464 } 1465 static bool classof(const Stmt *T) { 1466 return T->getStmtClass() == StringLiteralClass; 1467 } 1468 static bool classof(const StringLiteral *) { return true; } 1469 1470 // Iterators 1471 child_range children() { return child_range(); } 1472 }; 1473 1474 /// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1475 /// AST node is only formed if full location information is requested. 1476 class ParenExpr : public Expr { 1477 SourceLocation L, R; 1478 Stmt *Val; 1479 public: 1480 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1481 : Expr(ParenExprClass, val->getType(), 1482 val->getValueKind(), val->getObjectKind(), 1483 val->isTypeDependent(), val->isValueDependent(), 1484 val->isInstantiationDependent(), 1485 val->containsUnexpandedParameterPack()), 1486 L(l), R(r), Val(val) {} 1487 1488 /// \brief Construct an empty parenthesized expression. 1489 explicit ParenExpr(EmptyShell Empty) 1490 : Expr(ParenExprClass, Empty) { } 1491 1492 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1493 Expr *getSubExpr() { return cast<Expr>(Val); } 1494 void setSubExpr(Expr *E) { Val = E; } 1495 1496 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(L, R); } 1497 1498 /// \brief Get the location of the left parentheses '('. 1499 SourceLocation getLParen() const { return L; } 1500 void setLParen(SourceLocation Loc) { L = Loc; } 1501 1502 /// \brief Get the location of the right parentheses ')'. 1503 SourceLocation getRParen() const { return R; } 1504 void setRParen(SourceLocation Loc) { R = Loc; } 1505 1506 static bool classof(const Stmt *T) { 1507 return T->getStmtClass() == ParenExprClass; 1508 } 1509 static bool classof(const ParenExpr *) { return true; } 1510 1511 // Iterators 1512 child_range children() { return child_range(&Val, &Val+1); } 1513 }; 1514 1515 1516 /// UnaryOperator - This represents the unary-expression's (except sizeof and 1517 /// alignof), the postinc/postdec operators from postfix-expression, and various 1518 /// extensions. 1519 /// 1520 /// Notes on various nodes: 1521 /// 1522 /// Real/Imag - These return the real/imag part of a complex operand. If 1523 /// applied to a non-complex value, the former returns its operand and the 1524 /// later returns zero in the type of the operand. 1525 /// 1526 class UnaryOperator : public Expr { 1527 public: 1528 typedef UnaryOperatorKind Opcode; 1529 1530 private: 1531 unsigned Opc : 5; 1532 SourceLocation Loc; 1533 Stmt *Val; 1534 public: 1535 1536 UnaryOperator(Expr *input, Opcode opc, QualType type, 1537 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1538 : Expr(UnaryOperatorClass, type, VK, OK, 1539 input->isTypeDependent() || type->isDependentType(), 1540 input->isValueDependent(), 1541 (input->isInstantiationDependent() || 1542 type->isInstantiationDependentType()), 1543 input->containsUnexpandedParameterPack()), 1544 Opc(opc), Loc(l), Val(input) {} 1545 1546 /// \brief Build an empty unary operator. 1547 explicit UnaryOperator(EmptyShell Empty) 1548 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1549 1550 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1551 void setOpcode(Opcode O) { Opc = O; } 1552 1553 Expr *getSubExpr() const { return cast<Expr>(Val); } 1554 void setSubExpr(Expr *E) { Val = E; } 1555 1556 /// getOperatorLoc - Return the location of the operator. 1557 SourceLocation getOperatorLoc() const { return Loc; } 1558 void setOperatorLoc(SourceLocation L) { Loc = L; } 1559 1560 /// isPostfix - Return true if this is a postfix operation, like x++. 1561 static bool isPostfix(Opcode Op) { 1562 return Op == UO_PostInc || Op == UO_PostDec; 1563 } 1564 1565 /// isPrefix - Return true if this is a prefix operation, like --x. 1566 static bool isPrefix(Opcode Op) { 1567 return Op == UO_PreInc || Op == UO_PreDec; 1568 } 1569 1570 bool isPrefix() const { return isPrefix(getOpcode()); } 1571 bool isPostfix() const { return isPostfix(getOpcode()); } 1572 1573 static bool isIncrementOp(Opcode Op) { 1574 return Op == UO_PreInc || Op == UO_PostInc; 1575 } 1576 bool isIncrementOp() const { 1577 return isIncrementOp(getOpcode()); 1578 } 1579 1580 static bool isDecrementOp(Opcode Op) { 1581 return Op == UO_PreDec || Op == UO_PostDec; 1582 } 1583 bool isDecrementOp() const { 1584 return isDecrementOp(getOpcode()); 1585 } 1586 1587 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1588 bool isIncrementDecrementOp() const { 1589 return isIncrementDecrementOp(getOpcode()); 1590 } 1591 1592 static bool isArithmeticOp(Opcode Op) { 1593 return Op >= UO_Plus && Op <= UO_LNot; 1594 } 1595 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1596 1597 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1598 /// corresponds to, e.g. "sizeof" or "[pre]++" 1599 static const char *getOpcodeStr(Opcode Op); 1600 1601 /// \brief Retrieve the unary opcode that corresponds to the given 1602 /// overloaded operator. 1603 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1604 1605 /// \brief Retrieve the overloaded operator kind that corresponds to 1606 /// the given unary opcode. 1607 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1608 1609 SourceRange getSourceRange() const LLVM_READONLY { 1610 if (isPostfix()) 1611 return SourceRange(Val->getLocStart(), Loc); 1612 else 1613 return SourceRange(Loc, Val->getLocEnd()); 1614 } 1615 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; } 1616 1617 static bool classof(const Stmt *T) { 1618 return T->getStmtClass() == UnaryOperatorClass; 1619 } 1620 static bool classof(const UnaryOperator *) { return true; } 1621 1622 // Iterators 1623 child_range children() { return child_range(&Val, &Val+1); } 1624 }; 1625 1626 /// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1627 /// offsetof(record-type, member-designator). For example, given: 1628 /// @code 1629 /// struct S { 1630 /// float f; 1631 /// double d; 1632 /// }; 1633 /// struct T { 1634 /// int i; 1635 /// struct S s[10]; 1636 /// }; 1637 /// @endcode 1638 /// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1639 1640 class OffsetOfExpr : public Expr { 1641 public: 1642 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1643 class OffsetOfNode { 1644 public: 1645 /// \brief The kind of offsetof node we have. 1646 enum Kind { 1647 /// \brief An index into an array. 1648 Array = 0x00, 1649 /// \brief A field. 1650 Field = 0x01, 1651 /// \brief A field in a dependent type, known only by its name. 1652 Identifier = 0x02, 1653 /// \brief An implicit indirection through a C++ base class, when the 1654 /// field found is in a base class. 1655 Base = 0x03 1656 }; 1657 1658 private: 1659 enum { MaskBits = 2, Mask = 0x03 }; 1660 1661 /// \brief The source range that covers this part of the designator. 1662 SourceRange Range; 1663 1664 /// \brief The data describing the designator, which comes in three 1665 /// different forms, depending on the lower two bits. 1666 /// - An unsigned index into the array of Expr*'s stored after this node 1667 /// in memory, for [constant-expression] designators. 1668 /// - A FieldDecl*, for references to a known field. 1669 /// - An IdentifierInfo*, for references to a field with a given name 1670 /// when the class type is dependent. 1671 /// - A CXXBaseSpecifier*, for references that look at a field in a 1672 /// base class. 1673 uintptr_t Data; 1674 1675 public: 1676 /// \brief Create an offsetof node that refers to an array element. 1677 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1678 SourceLocation RBracketLoc) 1679 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1680 1681 /// \brief Create an offsetof node that refers to a field. 1682 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1683 SourceLocation NameLoc) 1684 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1685 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1686 1687 /// \brief Create an offsetof node that refers to an identifier. 1688 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1689 SourceLocation NameLoc) 1690 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1691 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1692 1693 /// \brief Create an offsetof node that refers into a C++ base class. 1694 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1695 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1696 1697 /// \brief Determine what kind of offsetof node this is. 1698 Kind getKind() const { 1699 return static_cast<Kind>(Data & Mask); 1700 } 1701 1702 /// \brief For an array element node, returns the index into the array 1703 /// of expressions. 1704 unsigned getArrayExprIndex() const { 1705 assert(getKind() == Array); 1706 return Data >> 2; 1707 } 1708 1709 /// \brief For a field offsetof node, returns the field. 1710 FieldDecl *getField() const { 1711 assert(getKind() == Field); 1712 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1713 } 1714 1715 /// \brief For a field or identifier offsetof node, returns the name of 1716 /// the field. 1717 IdentifierInfo *getFieldName() const; 1718 1719 /// \brief For a base class node, returns the base specifier. 1720 CXXBaseSpecifier *getBase() const { 1721 assert(getKind() == Base); 1722 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1723 } 1724 1725 /// \brief Retrieve the source range that covers this offsetof node. 1726 /// 1727 /// For an array element node, the source range contains the locations of 1728 /// the square brackets. For a field or identifier node, the source range 1729 /// contains the location of the period (if there is one) and the 1730 /// identifier. 1731 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 1732 }; 1733 1734 private: 1735 1736 SourceLocation OperatorLoc, RParenLoc; 1737 // Base type; 1738 TypeSourceInfo *TSInfo; 1739 // Number of sub-components (i.e. instances of OffsetOfNode). 1740 unsigned NumComps; 1741 // Number of sub-expressions (i.e. array subscript expressions). 1742 unsigned NumExprs; 1743 1744 OffsetOfExpr(ASTContext &C, QualType type, 1745 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1746 OffsetOfNode* compsPtr, unsigned numComps, 1747 Expr** exprsPtr, unsigned numExprs, 1748 SourceLocation RParenLoc); 1749 1750 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1751 : Expr(OffsetOfExprClass, EmptyShell()), 1752 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1753 1754 public: 1755 1756 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1757 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1758 OffsetOfNode* compsPtr, unsigned numComps, 1759 Expr** exprsPtr, unsigned numExprs, 1760 SourceLocation RParenLoc); 1761 1762 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1763 unsigned NumComps, unsigned NumExprs); 1764 1765 /// getOperatorLoc - Return the location of the operator. 1766 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1767 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1768 1769 /// \brief Return the location of the right parentheses. 1770 SourceLocation getRParenLoc() const { return RParenLoc; } 1771 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1772 1773 TypeSourceInfo *getTypeSourceInfo() const { 1774 return TSInfo; 1775 } 1776 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1777 TSInfo = tsi; 1778 } 1779 1780 const OffsetOfNode &getComponent(unsigned Idx) const { 1781 assert(Idx < NumComps && "Subscript out of range"); 1782 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1783 } 1784 1785 void setComponent(unsigned Idx, OffsetOfNode ON) { 1786 assert(Idx < NumComps && "Subscript out of range"); 1787 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1788 } 1789 1790 unsigned getNumComponents() const { 1791 return NumComps; 1792 } 1793 1794 Expr* getIndexExpr(unsigned Idx) { 1795 assert(Idx < NumExprs && "Subscript out of range"); 1796 return reinterpret_cast<Expr **>( 1797 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1798 } 1799 const Expr *getIndexExpr(unsigned Idx) const { 1800 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1801 } 1802 1803 void setIndexExpr(unsigned Idx, Expr* E) { 1804 assert(Idx < NumComps && "Subscript out of range"); 1805 reinterpret_cast<Expr **>( 1806 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1807 } 1808 1809 unsigned getNumExpressions() const { 1810 return NumExprs; 1811 } 1812 1813 SourceRange getSourceRange() const LLVM_READONLY { 1814 return SourceRange(OperatorLoc, RParenLoc); 1815 } 1816 1817 static bool classof(const Stmt *T) { 1818 return T->getStmtClass() == OffsetOfExprClass; 1819 } 1820 1821 static bool classof(const OffsetOfExpr *) { return true; } 1822 1823 // Iterators 1824 child_range children() { 1825 Stmt **begin = 1826 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1827 + NumComps); 1828 return child_range(begin, begin + NumExprs); 1829 } 1830 }; 1831 1832 /// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1833 /// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1834 /// vec_step (OpenCL 1.1 6.11.12). 1835 class UnaryExprOrTypeTraitExpr : public Expr { 1836 union { 1837 TypeSourceInfo *Ty; 1838 Stmt *Ex; 1839 } Argument; 1840 SourceLocation OpLoc, RParenLoc; 1841 1842 public: 1843 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1844 QualType resultType, SourceLocation op, 1845 SourceLocation rp) : 1846 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1847 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1848 // Value-dependent if the argument is type-dependent. 1849 TInfo->getType()->isDependentType(), 1850 TInfo->getType()->isInstantiationDependentType(), 1851 TInfo->getType()->containsUnexpandedParameterPack()), 1852 OpLoc(op), RParenLoc(rp) { 1853 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1854 UnaryExprOrTypeTraitExprBits.IsType = true; 1855 Argument.Ty = TInfo; 1856 } 1857 1858 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1859 QualType resultType, SourceLocation op, 1860 SourceLocation rp) : 1861 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1862 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1863 // Value-dependent if the argument is type-dependent. 1864 E->isTypeDependent(), 1865 E->isInstantiationDependent(), 1866 E->containsUnexpandedParameterPack()), 1867 OpLoc(op), RParenLoc(rp) { 1868 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1869 UnaryExprOrTypeTraitExprBits.IsType = false; 1870 Argument.Ex = E; 1871 } 1872 1873 /// \brief Construct an empty sizeof/alignof expression. 1874 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1875 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1876 1877 UnaryExprOrTypeTrait getKind() const { 1878 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind); 1879 } 1880 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;} 1881 1882 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; } 1883 QualType getArgumentType() const { 1884 return getArgumentTypeInfo()->getType(); 1885 } 1886 TypeSourceInfo *getArgumentTypeInfo() const { 1887 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1888 return Argument.Ty; 1889 } 1890 Expr *getArgumentExpr() { 1891 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1892 return static_cast<Expr*>(Argument.Ex); 1893 } 1894 const Expr *getArgumentExpr() const { 1895 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1896 } 1897 1898 void setArgument(Expr *E) { 1899 Argument.Ex = E; 1900 UnaryExprOrTypeTraitExprBits.IsType = false; 1901 } 1902 void setArgument(TypeSourceInfo *TInfo) { 1903 Argument.Ty = TInfo; 1904 UnaryExprOrTypeTraitExprBits.IsType = true; 1905 } 1906 1907 /// Gets the argument type, or the type of the argument expression, whichever 1908 /// is appropriate. 1909 QualType getTypeOfArgument() const { 1910 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1911 } 1912 1913 SourceLocation getOperatorLoc() const { return OpLoc; } 1914 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1915 1916 SourceLocation getRParenLoc() const { return RParenLoc; } 1917 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1918 1919 SourceRange getSourceRange() const LLVM_READONLY { 1920 return SourceRange(OpLoc, RParenLoc); 1921 } 1922 1923 static bool classof(const Stmt *T) { 1924 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1925 } 1926 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1927 1928 // Iterators 1929 child_range children(); 1930 }; 1931 1932 //===----------------------------------------------------------------------===// 1933 // Postfix Operators. 1934 //===----------------------------------------------------------------------===// 1935 1936 /// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1937 class ArraySubscriptExpr : public Expr { 1938 enum { LHS, RHS, END_EXPR=2 }; 1939 Stmt* SubExprs[END_EXPR]; 1940 SourceLocation RBracketLoc; 1941 public: 1942 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1943 ExprValueKind VK, ExprObjectKind OK, 1944 SourceLocation rbracketloc) 1945 : Expr(ArraySubscriptExprClass, t, VK, OK, 1946 lhs->isTypeDependent() || rhs->isTypeDependent(), 1947 lhs->isValueDependent() || rhs->isValueDependent(), 1948 (lhs->isInstantiationDependent() || 1949 rhs->isInstantiationDependent()), 1950 (lhs->containsUnexpandedParameterPack() || 1951 rhs->containsUnexpandedParameterPack())), 1952 RBracketLoc(rbracketloc) { 1953 SubExprs[LHS] = lhs; 1954 SubExprs[RHS] = rhs; 1955 } 1956 1957 /// \brief Create an empty array subscript expression. 1958 explicit ArraySubscriptExpr(EmptyShell Shell) 1959 : Expr(ArraySubscriptExprClass, Shell) { } 1960 1961 /// An array access can be written A[4] or 4[A] (both are equivalent). 1962 /// - getBase() and getIdx() always present the normalized view: A[4]. 1963 /// In this case getBase() returns "A" and getIdx() returns "4". 1964 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1965 /// 4[A] getLHS() returns "4". 1966 /// Note: Because vector element access is also written A[4] we must 1967 /// predicate the format conversion in getBase and getIdx only on the 1968 /// the type of the RHS, as it is possible for the LHS to be a vector of 1969 /// integer type 1970 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1971 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1972 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1973 1974 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1975 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1976 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1977 1978 Expr *getBase() { 1979 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1980 } 1981 1982 const Expr *getBase() const { 1983 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1984 } 1985 1986 Expr *getIdx() { 1987 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1988 } 1989 1990 const Expr *getIdx() const { 1991 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1992 } 1993 1994 SourceRange getSourceRange() const LLVM_READONLY { 1995 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1996 } 1997 1998 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1999 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 2000 2001 SourceLocation getExprLoc() const LLVM_READONLY { return getBase()->getExprLoc(); } 2002 2003 static bool classof(const Stmt *T) { 2004 return T->getStmtClass() == ArraySubscriptExprClass; 2005 } 2006 static bool classof(const ArraySubscriptExpr *) { return true; } 2007 2008 // Iterators 2009 child_range children() { 2010 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2011 } 2012 }; 2013 2014 2015 /// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 2016 /// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 2017 /// while its subclasses may represent alternative syntax that (semantically) 2018 /// results in a function call. For example, CXXOperatorCallExpr is 2019 /// a subclass for overloaded operator calls that use operator syntax, e.g., 2020 /// "str1 + str2" to resolve to a function call. 2021 class CallExpr : public Expr { 2022 enum { FN=0, PREARGS_START=1 }; 2023 Stmt **SubExprs; 2024 unsigned NumArgs; 2025 SourceLocation RParenLoc; 2026 2027 protected: 2028 // These versions of the constructor are for derived classes. 2029 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 2030 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 2031 SourceLocation rparenloc); 2032 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 2033 2034 Stmt *getPreArg(unsigned i) { 2035 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2036 return SubExprs[PREARGS_START+i]; 2037 } 2038 const Stmt *getPreArg(unsigned i) const { 2039 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2040 return SubExprs[PREARGS_START+i]; 2041 } 2042 void setPreArg(unsigned i, Stmt *PreArg) { 2043 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2044 SubExprs[PREARGS_START+i] = PreArg; 2045 } 2046 2047 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2048 2049 public: 2050 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 2051 ExprValueKind VK, SourceLocation rparenloc); 2052 2053 /// \brief Build an empty call expression. 2054 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 2055 2056 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2057 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2058 void setCallee(Expr *F) { SubExprs[FN] = F; } 2059 2060 Decl *getCalleeDecl(); 2061 const Decl *getCalleeDecl() const { 2062 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2063 } 2064 2065 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2066 FunctionDecl *getDirectCallee(); 2067 const FunctionDecl *getDirectCallee() const { 2068 return const_cast<CallExpr*>(this)->getDirectCallee(); 2069 } 2070 2071 /// getNumArgs - Return the number of actual arguments to this call. 2072 /// 2073 unsigned getNumArgs() const { return NumArgs; } 2074 2075 /// \brief Retrieve the call arguments. 2076 Expr **getArgs() { 2077 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2078 } 2079 const Expr *const *getArgs() const { 2080 return const_cast<CallExpr*>(this)->getArgs(); 2081 } 2082 2083 /// getArg - Return the specified argument. 2084 Expr *getArg(unsigned Arg) { 2085 assert(Arg < NumArgs && "Arg access out of range!"); 2086 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2087 } 2088 const Expr *getArg(unsigned Arg) const { 2089 assert(Arg < NumArgs && "Arg access out of range!"); 2090 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2091 } 2092 2093 /// setArg - Set the specified argument. 2094 void setArg(unsigned Arg, Expr *ArgExpr) { 2095 assert(Arg < NumArgs && "Arg access out of range!"); 2096 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2097 } 2098 2099 /// setNumArgs - This changes the number of arguments present in this call. 2100 /// Any orphaned expressions are deleted by this, and any new operands are set 2101 /// to null. 2102 void setNumArgs(ASTContext& C, unsigned NumArgs); 2103 2104 typedef ExprIterator arg_iterator; 2105 typedef ConstExprIterator const_arg_iterator; 2106 2107 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2108 arg_iterator arg_end() { 2109 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2110 } 2111 const_arg_iterator arg_begin() const { 2112 return SubExprs+PREARGS_START+getNumPreArgs(); 2113 } 2114 const_arg_iterator arg_end() const { 2115 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2116 } 2117 2118 /// getNumCommas - Return the number of commas that must have been present in 2119 /// this function call. 2120 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2121 2122 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2123 /// not, return 0. 2124 unsigned isBuiltinCall() const; 2125 2126 /// getCallReturnType - Get the return type of the call expr. This is not 2127 /// always the type of the expr itself, if the return type is a reference 2128 /// type. 2129 QualType getCallReturnType() const; 2130 2131 SourceLocation getRParenLoc() const { return RParenLoc; } 2132 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2133 2134 SourceRange getSourceRange() const LLVM_READONLY; 2135 SourceLocation getLocStart() const LLVM_READONLY; 2136 SourceLocation getLocEnd() const LLVM_READONLY; 2137 2138 static bool classof(const Stmt *T) { 2139 return T->getStmtClass() >= firstCallExprConstant && 2140 T->getStmtClass() <= lastCallExprConstant; 2141 } 2142 static bool classof(const CallExpr *) { return true; } 2143 2144 // Iterators 2145 child_range children() { 2146 return child_range(&SubExprs[0], 2147 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2148 } 2149 }; 2150 2151 /// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2152 /// 2153 class MemberExpr : public Expr { 2154 /// Extra data stored in some member expressions. 2155 struct MemberNameQualifier { 2156 /// \brief The nested-name-specifier that qualifies the name, including 2157 /// source-location information. 2158 NestedNameSpecifierLoc QualifierLoc; 2159 2160 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2161 /// name qualifiers. 2162 DeclAccessPair FoundDecl; 2163 }; 2164 2165 /// Base - the expression for the base pointer or structure references. In 2166 /// X.F, this is "X". 2167 Stmt *Base; 2168 2169 /// MemberDecl - This is the decl being referenced by the field/member name. 2170 /// In X.F, this is the decl referenced by F. 2171 ValueDecl *MemberDecl; 2172 2173 /// MemberDNLoc - Provides source/type location info for the 2174 /// declaration name embedded in MemberDecl. 2175 DeclarationNameLoc MemberDNLoc; 2176 2177 /// MemberLoc - This is the location of the member name. 2178 SourceLocation MemberLoc; 2179 2180 /// IsArrow - True if this is "X->F", false if this is "X.F". 2181 bool IsArrow : 1; 2182 2183 /// \brief True if this member expression used a nested-name-specifier to 2184 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2185 /// declaration. When true, a MemberNameQualifier 2186 /// structure is allocated immediately after the MemberExpr. 2187 bool HasQualifierOrFoundDecl : 1; 2188 2189 /// \brief True if this member expression specified a template keyword 2190 /// and/or a template argument list explicitly, e.g., x->f<int>, 2191 /// x->template f, x->template f<int>. 2192 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2193 /// TemplateArguments (if any) are allocated immediately after 2194 /// the MemberExpr or, if the member expression also has a qualifier, 2195 /// after the MemberNameQualifier structure. 2196 bool HasTemplateKWAndArgsInfo : 1; 2197 2198 /// \brief True if this member expression refers to a method that 2199 /// was resolved from an overloaded set having size greater than 1. 2200 bool HadMultipleCandidates : 1; 2201 2202 /// \brief Retrieve the qualifier that preceded the member name, if any. 2203 MemberNameQualifier *getMemberQualifier() { 2204 assert(HasQualifierOrFoundDecl); 2205 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2206 } 2207 2208 /// \brief Retrieve the qualifier that preceded the member name, if any. 2209 const MemberNameQualifier *getMemberQualifier() const { 2210 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2211 } 2212 2213 public: 2214 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2215 const DeclarationNameInfo &NameInfo, QualType ty, 2216 ExprValueKind VK, ExprObjectKind OK) 2217 : Expr(MemberExprClass, ty, VK, OK, 2218 base->isTypeDependent(), 2219 base->isValueDependent(), 2220 base->isInstantiationDependent(), 2221 base->containsUnexpandedParameterPack()), 2222 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()), 2223 MemberLoc(NameInfo.getLoc()), IsArrow(isarrow), 2224 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2225 HadMultipleCandidates(false) { 2226 assert(memberdecl->getDeclName() == NameInfo.getName()); 2227 } 2228 2229 // NOTE: this constructor should be used only when it is known that 2230 // the member name can not provide additional syntactic info 2231 // (i.e., source locations for C++ operator names or type source info 2232 // for constructors, destructors and conversion operators). 2233 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2234 SourceLocation l, QualType ty, 2235 ExprValueKind VK, ExprObjectKind OK) 2236 : Expr(MemberExprClass, ty, VK, OK, 2237 base->isTypeDependent(), base->isValueDependent(), 2238 base->isInstantiationDependent(), 2239 base->containsUnexpandedParameterPack()), 2240 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l), 2241 IsArrow(isarrow), 2242 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2243 HadMultipleCandidates(false) {} 2244 2245 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2246 NestedNameSpecifierLoc QualifierLoc, 2247 SourceLocation TemplateKWLoc, 2248 ValueDecl *memberdecl, DeclAccessPair founddecl, 2249 DeclarationNameInfo MemberNameInfo, 2250 const TemplateArgumentListInfo *targs, 2251 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2252 2253 void setBase(Expr *E) { Base = E; } 2254 Expr *getBase() const { return cast<Expr>(Base); } 2255 2256 /// \brief Retrieve the member declaration to which this expression refers. 2257 /// 2258 /// The returned declaration will either be a FieldDecl or (in C++) 2259 /// a CXXMethodDecl. 2260 ValueDecl *getMemberDecl() const { return MemberDecl; } 2261 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2262 2263 /// \brief Retrieves the declaration found by lookup. 2264 DeclAccessPair getFoundDecl() const { 2265 if (!HasQualifierOrFoundDecl) 2266 return DeclAccessPair::make(getMemberDecl(), 2267 getMemberDecl()->getAccess()); 2268 return getMemberQualifier()->FoundDecl; 2269 } 2270 2271 /// \brief Determines whether this member expression actually had 2272 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2273 /// x->Base::foo. 2274 bool hasQualifier() const { return getQualifier() != 0; } 2275 2276 /// \brief If the member name was qualified, retrieves the 2277 /// nested-name-specifier that precedes the member name. Otherwise, returns 2278 /// NULL. 2279 NestedNameSpecifier *getQualifier() const { 2280 if (!HasQualifierOrFoundDecl) 2281 return 0; 2282 2283 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2284 } 2285 2286 /// \brief If the member name was qualified, retrieves the 2287 /// nested-name-specifier that precedes the member name, with source-location 2288 /// information. 2289 NestedNameSpecifierLoc getQualifierLoc() const { 2290 if (!hasQualifier()) 2291 return NestedNameSpecifierLoc(); 2292 2293 return getMemberQualifier()->QualifierLoc; 2294 } 2295 2296 /// \brief Return the optional template keyword and arguments info. 2297 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 2298 if (!HasTemplateKWAndArgsInfo) 2299 return 0; 2300 2301 if (!HasQualifierOrFoundDecl) 2302 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 2303 2304 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 2305 getMemberQualifier() + 1); 2306 } 2307 2308 /// \brief Return the optional template keyword and arguments info. 2309 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 2310 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo(); 2311 } 2312 2313 /// \brief Retrieve the location of the template keyword preceding 2314 /// the member name, if any. 2315 SourceLocation getTemplateKeywordLoc() const { 2316 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2317 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 2318 } 2319 2320 /// \brief Retrieve the location of the left angle bracket starting the 2321 /// explicit template argument list following the member name, if any. 2322 SourceLocation getLAngleLoc() const { 2323 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2324 return getTemplateKWAndArgsInfo()->LAngleLoc; 2325 } 2326 2327 /// \brief Retrieve the location of the right angle bracket ending the 2328 /// explicit template argument list following the member name, if any. 2329 SourceLocation getRAngleLoc() const { 2330 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2331 return getTemplateKWAndArgsInfo()->RAngleLoc; 2332 } 2333 2334 /// Determines whether the member name was preceded by the template keyword. 2335 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2336 2337 /// \brief Determines whether the member name was followed by an 2338 /// explicit template argument list. 2339 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2340 2341 /// \brief Copies the template arguments (if present) into the given 2342 /// structure. 2343 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2344 if (hasExplicitTemplateArgs()) 2345 getExplicitTemplateArgs().copyInto(List); 2346 } 2347 2348 /// \brief Retrieve the explicit template argument list that 2349 /// follow the member template name. This must only be called on an 2350 /// expression with explicit template arguments. 2351 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2352 assert(hasExplicitTemplateArgs()); 2353 return *getTemplateKWAndArgsInfo(); 2354 } 2355 2356 /// \brief Retrieve the explicit template argument list that 2357 /// followed the member template name. This must only be called on 2358 /// an expression with explicit template arguments. 2359 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2360 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2361 } 2362 2363 /// \brief Retrieves the optional explicit template arguments. 2364 /// This points to the same data as getExplicitTemplateArgs(), but 2365 /// returns null if there are no explicit template arguments. 2366 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2367 if (!hasExplicitTemplateArgs()) return 0; 2368 return &getExplicitTemplateArgs(); 2369 } 2370 2371 /// \brief Retrieve the template arguments provided as part of this 2372 /// template-id. 2373 const TemplateArgumentLoc *getTemplateArgs() const { 2374 if (!hasExplicitTemplateArgs()) 2375 return 0; 2376 2377 return getExplicitTemplateArgs().getTemplateArgs(); 2378 } 2379 2380 /// \brief Retrieve the number of template arguments provided as part of this 2381 /// template-id. 2382 unsigned getNumTemplateArgs() const { 2383 if (!hasExplicitTemplateArgs()) 2384 return 0; 2385 2386 return getExplicitTemplateArgs().NumTemplateArgs; 2387 } 2388 2389 /// \brief Retrieve the member declaration name info. 2390 DeclarationNameInfo getMemberNameInfo() const { 2391 return DeclarationNameInfo(MemberDecl->getDeclName(), 2392 MemberLoc, MemberDNLoc); 2393 } 2394 2395 bool isArrow() const { return IsArrow; } 2396 void setArrow(bool A) { IsArrow = A; } 2397 2398 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2399 /// location of 'F'. 2400 SourceLocation getMemberLoc() const { return MemberLoc; } 2401 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2402 2403 SourceRange getSourceRange() const LLVM_READONLY; 2404 SourceLocation getLocStart() const LLVM_READONLY; 2405 SourceLocation getLocEnd() const LLVM_READONLY; 2406 2407 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; } 2408 2409 /// \brief Determine whether the base of this explicit is implicit. 2410 bool isImplicitAccess() const { 2411 return getBase() && getBase()->isImplicitCXXThis(); 2412 } 2413 2414 /// \brief Returns true if this member expression refers to a method that 2415 /// was resolved from an overloaded set having size greater than 1. 2416 bool hadMultipleCandidates() const { 2417 return HadMultipleCandidates; 2418 } 2419 /// \brief Sets the flag telling whether this expression refers to 2420 /// a method that was resolved from an overloaded set having size 2421 /// greater than 1. 2422 void setHadMultipleCandidates(bool V = true) { 2423 HadMultipleCandidates = V; 2424 } 2425 2426 static bool classof(const Stmt *T) { 2427 return T->getStmtClass() == MemberExprClass; 2428 } 2429 static bool classof(const MemberExpr *) { return true; } 2430 2431 // Iterators 2432 child_range children() { return child_range(&Base, &Base+1); } 2433 2434 friend class ASTReader; 2435 friend class ASTStmtWriter; 2436 }; 2437 2438 /// CompoundLiteralExpr - [C99 6.5.2.5] 2439 /// 2440 class CompoundLiteralExpr : public Expr { 2441 /// LParenLoc - If non-null, this is the location of the left paren in a 2442 /// compound literal like "(int){4}". This can be null if this is a 2443 /// synthesized compound expression. 2444 SourceLocation LParenLoc; 2445 2446 /// The type as written. This can be an incomplete array type, in 2447 /// which case the actual expression type will be different. 2448 /// The int part of the pair stores whether this expr is file scope. 2449 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope; 2450 Stmt *Init; 2451 public: 2452 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2453 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2454 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2455 tinfo->getType()->isDependentType(), 2456 init->isValueDependent(), 2457 (init->isInstantiationDependent() || 2458 tinfo->getType()->isInstantiationDependentType()), 2459 init->containsUnexpandedParameterPack()), 2460 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {} 2461 2462 /// \brief Construct an empty compound literal. 2463 explicit CompoundLiteralExpr(EmptyShell Empty) 2464 : Expr(CompoundLiteralExprClass, Empty) { } 2465 2466 const Expr *getInitializer() const { return cast<Expr>(Init); } 2467 Expr *getInitializer() { return cast<Expr>(Init); } 2468 void setInitializer(Expr *E) { Init = E; } 2469 2470 bool isFileScope() const { return TInfoAndScope.getInt(); } 2471 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); } 2472 2473 SourceLocation getLParenLoc() const { return LParenLoc; } 2474 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2475 2476 TypeSourceInfo *getTypeSourceInfo() const { 2477 return TInfoAndScope.getPointer(); 2478 } 2479 void setTypeSourceInfo(TypeSourceInfo *tinfo) { 2480 TInfoAndScope.setPointer(tinfo); 2481 } 2482 2483 SourceRange getSourceRange() const LLVM_READONLY { 2484 // FIXME: Init should never be null. 2485 if (!Init) 2486 return SourceRange(); 2487 if (LParenLoc.isInvalid()) 2488 return Init->getSourceRange(); 2489 return SourceRange(LParenLoc, Init->getLocEnd()); 2490 } 2491 2492 static bool classof(const Stmt *T) { 2493 return T->getStmtClass() == CompoundLiteralExprClass; 2494 } 2495 static bool classof(const CompoundLiteralExpr *) { return true; } 2496 2497 // Iterators 2498 child_range children() { return child_range(&Init, &Init+1); } 2499 }; 2500 2501 /// CastExpr - Base class for type casts, including both implicit 2502 /// casts (ImplicitCastExpr) and explicit casts that have some 2503 /// representation in the source code (ExplicitCastExpr's derived 2504 /// classes). 2505 class CastExpr : public Expr { 2506 public: 2507 typedef clang::CastKind CastKind; 2508 2509 private: 2510 Stmt *Op; 2511 2512 void CheckCastConsistency() const; 2513 2514 const CXXBaseSpecifier * const *path_buffer() const { 2515 return const_cast<CastExpr*>(this)->path_buffer(); 2516 } 2517 CXXBaseSpecifier **path_buffer(); 2518 2519 void setBasePathSize(unsigned basePathSize) { 2520 CastExprBits.BasePathSize = basePathSize; 2521 assert(CastExprBits.BasePathSize == basePathSize && 2522 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2523 } 2524 2525 protected: 2526 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2527 const CastKind kind, Expr *op, unsigned BasePathSize) : 2528 Expr(SC, ty, VK, OK_Ordinary, 2529 // Cast expressions are type-dependent if the type is 2530 // dependent (C++ [temp.dep.expr]p3). 2531 ty->isDependentType(), 2532 // Cast expressions are value-dependent if the type is 2533 // dependent or if the subexpression is value-dependent. 2534 ty->isDependentType() || (op && op->isValueDependent()), 2535 (ty->isInstantiationDependentType() || 2536 (op && op->isInstantiationDependent())), 2537 (ty->containsUnexpandedParameterPack() || 2538 op->containsUnexpandedParameterPack())), 2539 Op(op) { 2540 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2541 CastExprBits.Kind = kind; 2542 setBasePathSize(BasePathSize); 2543 #ifndef NDEBUG 2544 CheckCastConsistency(); 2545 #endif 2546 } 2547 2548 /// \brief Construct an empty cast. 2549 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2550 : Expr(SC, Empty) { 2551 setBasePathSize(BasePathSize); 2552 } 2553 2554 public: 2555 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2556 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2557 const char *getCastKindName() const; 2558 2559 Expr *getSubExpr() { return cast<Expr>(Op); } 2560 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2561 void setSubExpr(Expr *E) { Op = E; } 2562 2563 /// \brief Retrieve the cast subexpression as it was written in the source 2564 /// code, looking through any implicit casts or other intermediate nodes 2565 /// introduced by semantic analysis. 2566 Expr *getSubExprAsWritten(); 2567 const Expr *getSubExprAsWritten() const { 2568 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2569 } 2570 2571 typedef CXXBaseSpecifier **path_iterator; 2572 typedef const CXXBaseSpecifier * const *path_const_iterator; 2573 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2574 unsigned path_size() const { return CastExprBits.BasePathSize; } 2575 path_iterator path_begin() { return path_buffer(); } 2576 path_iterator path_end() { return path_buffer() + path_size(); } 2577 path_const_iterator path_begin() const { return path_buffer(); } 2578 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2579 2580 void setCastPath(const CXXCastPath &Path); 2581 2582 static bool classof(const Stmt *T) { 2583 return T->getStmtClass() >= firstCastExprConstant && 2584 T->getStmtClass() <= lastCastExprConstant; 2585 } 2586 static bool classof(const CastExpr *) { return true; } 2587 2588 // Iterators 2589 child_range children() { return child_range(&Op, &Op+1); } 2590 }; 2591 2592 /// ImplicitCastExpr - Allows us to explicitly represent implicit type 2593 /// conversions, which have no direct representation in the original 2594 /// source code. For example: converting T[]->T*, void f()->void 2595 /// (*f)(), float->double, short->int, etc. 2596 /// 2597 /// In C, implicit casts always produce rvalues. However, in C++, an 2598 /// implicit cast whose result is being bound to a reference will be 2599 /// an lvalue or xvalue. For example: 2600 /// 2601 /// @code 2602 /// class Base { }; 2603 /// class Derived : public Base { }; 2604 /// Derived &&ref(); 2605 /// void f(Derived d) { 2606 /// Base& b = d; // initializer is an ImplicitCastExpr 2607 /// // to an lvalue of type Base 2608 /// Base&& r = ref(); // initializer is an ImplicitCastExpr 2609 /// // to an xvalue of type Base 2610 /// } 2611 /// @endcode 2612 class ImplicitCastExpr : public CastExpr { 2613 private: 2614 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2615 unsigned BasePathLength, ExprValueKind VK) 2616 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2617 } 2618 2619 /// \brief Construct an empty implicit cast. 2620 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2621 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2622 2623 public: 2624 enum OnStack_t { OnStack }; 2625 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2626 ExprValueKind VK) 2627 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2628 } 2629 2630 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2631 CastKind Kind, Expr *Operand, 2632 const CXXCastPath *BasePath, 2633 ExprValueKind Cat); 2634 2635 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2636 2637 SourceRange getSourceRange() const LLVM_READONLY { 2638 return getSubExpr()->getSourceRange(); 2639 } 2640 SourceLocation getLocStart() const LLVM_READONLY { 2641 return getSubExpr()->getLocStart(); 2642 } 2643 SourceLocation getLocEnd() const LLVM_READONLY { 2644 return getSubExpr()->getLocEnd(); 2645 } 2646 2647 static bool classof(const Stmt *T) { 2648 return T->getStmtClass() == ImplicitCastExprClass; 2649 } 2650 static bool classof(const ImplicitCastExpr *) { return true; } 2651 }; 2652 2653 inline Expr *Expr::IgnoreImpCasts() { 2654 Expr *e = this; 2655 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2656 e = ice->getSubExpr(); 2657 return e; 2658 } 2659 2660 /// ExplicitCastExpr - An explicit cast written in the source 2661 /// code. 2662 /// 2663 /// This class is effectively an abstract class, because it provides 2664 /// the basic representation of an explicitly-written cast without 2665 /// specifying which kind of cast (C cast, functional cast, static 2666 /// cast, etc.) was written; specific derived classes represent the 2667 /// particular style of cast and its location information. 2668 /// 2669 /// Unlike implicit casts, explicit cast nodes have two different 2670 /// types: the type that was written into the source code, and the 2671 /// actual type of the expression as determined by semantic 2672 /// analysis. These types may differ slightly. For example, in C++ one 2673 /// can cast to a reference type, which indicates that the resulting 2674 /// expression will be an lvalue or xvalue. The reference type, however, 2675 /// will not be used as the type of the expression. 2676 class ExplicitCastExpr : public CastExpr { 2677 /// TInfo - Source type info for the (written) type 2678 /// this expression is casting to. 2679 TypeSourceInfo *TInfo; 2680 2681 protected: 2682 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2683 CastKind kind, Expr *op, unsigned PathSize, 2684 TypeSourceInfo *writtenTy) 2685 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2686 2687 /// \brief Construct an empty explicit cast. 2688 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2689 : CastExpr(SC, Shell, PathSize) { } 2690 2691 public: 2692 /// getTypeInfoAsWritten - Returns the type source info for the type 2693 /// that this expression is casting to. 2694 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2695 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2696 2697 /// getTypeAsWritten - Returns the type that this expression is 2698 /// casting to, as written in the source code. 2699 QualType getTypeAsWritten() const { return TInfo->getType(); } 2700 2701 static bool classof(const Stmt *T) { 2702 return T->getStmtClass() >= firstExplicitCastExprConstant && 2703 T->getStmtClass() <= lastExplicitCastExprConstant; 2704 } 2705 static bool classof(const ExplicitCastExpr *) { return true; } 2706 }; 2707 2708 /// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2709 /// cast in C++ (C++ [expr.cast]), which uses the syntax 2710 /// (Type)expr. For example: @c (int)f. 2711 class CStyleCastExpr : public ExplicitCastExpr { 2712 SourceLocation LPLoc; // the location of the left paren 2713 SourceLocation RPLoc; // the location of the right paren 2714 2715 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2716 unsigned PathSize, TypeSourceInfo *writtenTy, 2717 SourceLocation l, SourceLocation r) 2718 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2719 writtenTy), LPLoc(l), RPLoc(r) {} 2720 2721 /// \brief Construct an empty C-style explicit cast. 2722 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2723 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2724 2725 public: 2726 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2727 ExprValueKind VK, CastKind K, 2728 Expr *Op, const CXXCastPath *BasePath, 2729 TypeSourceInfo *WrittenTy, SourceLocation L, 2730 SourceLocation R); 2731 2732 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2733 2734 SourceLocation getLParenLoc() const { return LPLoc; } 2735 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2736 2737 SourceLocation getRParenLoc() const { return RPLoc; } 2738 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2739 2740 SourceRange getSourceRange() const LLVM_READONLY { 2741 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2742 } 2743 static bool classof(const Stmt *T) { 2744 return T->getStmtClass() == CStyleCastExprClass; 2745 } 2746 static bool classof(const CStyleCastExpr *) { return true; } 2747 }; 2748 2749 /// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2750 /// 2751 /// This expression node kind describes a builtin binary operation, 2752 /// such as "x + y" for integer values "x" and "y". The operands will 2753 /// already have been converted to appropriate types (e.g., by 2754 /// performing promotions or conversions). 2755 /// 2756 /// In C++, where operators may be overloaded, a different kind of 2757 /// expression node (CXXOperatorCallExpr) is used to express the 2758 /// invocation of an overloaded operator with operator syntax. Within 2759 /// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2760 /// used to store an expression "x + y" depends on the subexpressions 2761 /// for x and y. If neither x or y is type-dependent, and the "+" 2762 /// operator resolves to a built-in operation, BinaryOperator will be 2763 /// used to express the computation (x and y may still be 2764 /// value-dependent). If either x or y is type-dependent, or if the 2765 /// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2766 /// be used to express the computation. 2767 class BinaryOperator : public Expr { 2768 public: 2769 typedef BinaryOperatorKind Opcode; 2770 2771 private: 2772 unsigned Opc : 6; 2773 SourceLocation OpLoc; 2774 2775 enum { LHS, RHS, END_EXPR }; 2776 Stmt* SubExprs[END_EXPR]; 2777 public: 2778 2779 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2780 ExprValueKind VK, ExprObjectKind OK, 2781 SourceLocation opLoc) 2782 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2783 lhs->isTypeDependent() || rhs->isTypeDependent(), 2784 lhs->isValueDependent() || rhs->isValueDependent(), 2785 (lhs->isInstantiationDependent() || 2786 rhs->isInstantiationDependent()), 2787 (lhs->containsUnexpandedParameterPack() || 2788 rhs->containsUnexpandedParameterPack())), 2789 Opc(opc), OpLoc(opLoc) { 2790 SubExprs[LHS] = lhs; 2791 SubExprs[RHS] = rhs; 2792 assert(!isCompoundAssignmentOp() && 2793 "Use ArithAssignBinaryOperator for compound assignments"); 2794 } 2795 2796 /// \brief Construct an empty binary operator. 2797 explicit BinaryOperator(EmptyShell Empty) 2798 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2799 2800 SourceLocation getExprLoc() const LLVM_READONLY { return OpLoc; } 2801 SourceLocation getOperatorLoc() const { return OpLoc; } 2802 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2803 2804 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2805 void setOpcode(Opcode O) { Opc = O; } 2806 2807 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2808 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2809 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2810 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2811 2812 SourceRange getSourceRange() const LLVM_READONLY { 2813 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2814 } 2815 2816 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2817 /// corresponds to, e.g. "<<=". 2818 static const char *getOpcodeStr(Opcode Op); 2819 2820 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2821 2822 /// \brief Retrieve the binary opcode that corresponds to the given 2823 /// overloaded operator. 2824 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2825 2826 /// \brief Retrieve the overloaded operator kind that corresponds to 2827 /// the given binary opcode. 2828 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2829 2830 /// predicates to categorize the respective opcodes. 2831 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2832 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2833 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2834 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2835 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2836 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2837 2838 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2839 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2840 2841 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2842 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2843 2844 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2845 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2846 2847 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2848 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2849 2850 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2851 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2852 2853 static bool isAssignmentOp(Opcode Opc) { 2854 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2855 } 2856 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2857 2858 static bool isCompoundAssignmentOp(Opcode Opc) { 2859 return Opc > BO_Assign && Opc <= BO_OrAssign; 2860 } 2861 bool isCompoundAssignmentOp() const { 2862 return isCompoundAssignmentOp(getOpcode()); 2863 } 2864 static Opcode getOpForCompoundAssignment(Opcode Opc) { 2865 assert(isCompoundAssignmentOp(Opc)); 2866 if (Opc >= BO_AndAssign) 2867 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 2868 else 2869 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 2870 } 2871 2872 static bool isShiftAssignOp(Opcode Opc) { 2873 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2874 } 2875 bool isShiftAssignOp() const { 2876 return isShiftAssignOp(getOpcode()); 2877 } 2878 2879 static bool classof(const Stmt *S) { 2880 return S->getStmtClass() >= firstBinaryOperatorConstant && 2881 S->getStmtClass() <= lastBinaryOperatorConstant; 2882 } 2883 static bool classof(const BinaryOperator *) { return true; } 2884 2885 // Iterators 2886 child_range children() { 2887 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2888 } 2889 2890 protected: 2891 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2892 ExprValueKind VK, ExprObjectKind OK, 2893 SourceLocation opLoc, bool dead) 2894 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2895 lhs->isTypeDependent() || rhs->isTypeDependent(), 2896 lhs->isValueDependent() || rhs->isValueDependent(), 2897 (lhs->isInstantiationDependent() || 2898 rhs->isInstantiationDependent()), 2899 (lhs->containsUnexpandedParameterPack() || 2900 rhs->containsUnexpandedParameterPack())), 2901 Opc(opc), OpLoc(opLoc) { 2902 SubExprs[LHS] = lhs; 2903 SubExprs[RHS] = rhs; 2904 } 2905 2906 BinaryOperator(StmtClass SC, EmptyShell Empty) 2907 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2908 }; 2909 2910 /// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2911 /// track of the type the operation is performed in. Due to the semantics of 2912 /// these operators, the operands are promoted, the arithmetic performed, an 2913 /// implicit conversion back to the result type done, then the assignment takes 2914 /// place. This captures the intermediate type which the computation is done 2915 /// in. 2916 class CompoundAssignOperator : public BinaryOperator { 2917 QualType ComputationLHSType; 2918 QualType ComputationResultType; 2919 public: 2920 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2921 ExprValueKind VK, ExprObjectKind OK, 2922 QualType CompLHSType, QualType CompResultType, 2923 SourceLocation OpLoc) 2924 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2925 ComputationLHSType(CompLHSType), 2926 ComputationResultType(CompResultType) { 2927 assert(isCompoundAssignmentOp() && 2928 "Only should be used for compound assignments"); 2929 } 2930 2931 /// \brief Build an empty compound assignment operator expression. 2932 explicit CompoundAssignOperator(EmptyShell Empty) 2933 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2934 2935 // The two computation types are the type the LHS is converted 2936 // to for the computation and the type of the result; the two are 2937 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2938 QualType getComputationLHSType() const { return ComputationLHSType; } 2939 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2940 2941 QualType getComputationResultType() const { return ComputationResultType; } 2942 void setComputationResultType(QualType T) { ComputationResultType = T; } 2943 2944 static bool classof(const CompoundAssignOperator *) { return true; } 2945 static bool classof(const Stmt *S) { 2946 return S->getStmtClass() == CompoundAssignOperatorClass; 2947 } 2948 }; 2949 2950 /// AbstractConditionalOperator - An abstract base class for 2951 /// ConditionalOperator and BinaryConditionalOperator. 2952 class AbstractConditionalOperator : public Expr { 2953 SourceLocation QuestionLoc, ColonLoc; 2954 friend class ASTStmtReader; 2955 2956 protected: 2957 AbstractConditionalOperator(StmtClass SC, QualType T, 2958 ExprValueKind VK, ExprObjectKind OK, 2959 bool TD, bool VD, bool ID, 2960 bool ContainsUnexpandedParameterPack, 2961 SourceLocation qloc, 2962 SourceLocation cloc) 2963 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 2964 QuestionLoc(qloc), ColonLoc(cloc) {} 2965 2966 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2967 : Expr(SC, Empty) { } 2968 2969 public: 2970 // getCond - Return the expression representing the condition for 2971 // the ?: operator. 2972 Expr *getCond() const; 2973 2974 // getTrueExpr - Return the subexpression representing the value of 2975 // the expression if the condition evaluates to true. 2976 Expr *getTrueExpr() const; 2977 2978 // getFalseExpr - Return the subexpression representing the value of 2979 // the expression if the condition evaluates to false. This is 2980 // the same as getRHS. 2981 Expr *getFalseExpr() const; 2982 2983 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2984 SourceLocation getColonLoc() const { return ColonLoc; } 2985 2986 static bool classof(const Stmt *T) { 2987 return T->getStmtClass() == ConditionalOperatorClass || 2988 T->getStmtClass() == BinaryConditionalOperatorClass; 2989 } 2990 static bool classof(const AbstractConditionalOperator *) { return true; } 2991 }; 2992 2993 /// ConditionalOperator - The ?: ternary operator. The GNU "missing 2994 /// middle" extension is a BinaryConditionalOperator. 2995 class ConditionalOperator : public AbstractConditionalOperator { 2996 enum { COND, LHS, RHS, END_EXPR }; 2997 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2998 2999 friend class ASTStmtReader; 3000 public: 3001 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 3002 SourceLocation CLoc, Expr *rhs, 3003 QualType t, ExprValueKind VK, ExprObjectKind OK) 3004 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 3005 // FIXME: the type of the conditional operator doesn't 3006 // depend on the type of the conditional, but the standard 3007 // seems to imply that it could. File a bug! 3008 (lhs->isTypeDependent() || rhs->isTypeDependent()), 3009 (cond->isValueDependent() || lhs->isValueDependent() || 3010 rhs->isValueDependent()), 3011 (cond->isInstantiationDependent() || 3012 lhs->isInstantiationDependent() || 3013 rhs->isInstantiationDependent()), 3014 (cond->containsUnexpandedParameterPack() || 3015 lhs->containsUnexpandedParameterPack() || 3016 rhs->containsUnexpandedParameterPack()), 3017 QLoc, CLoc) { 3018 SubExprs[COND] = cond; 3019 SubExprs[LHS] = lhs; 3020 SubExprs[RHS] = rhs; 3021 } 3022 3023 /// \brief Build an empty conditional operator. 3024 explicit ConditionalOperator(EmptyShell Empty) 3025 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 3026 3027 // getCond - Return the expression representing the condition for 3028 // the ?: operator. 3029 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3030 3031 // getTrueExpr - Return the subexpression representing the value of 3032 // the expression if the condition evaluates to true. 3033 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3034 3035 // getFalseExpr - Return the subexpression representing the value of 3036 // the expression if the condition evaluates to false. This is 3037 // the same as getRHS. 3038 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3039 3040 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3041 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3042 3043 SourceRange getSourceRange() const LLVM_READONLY { 3044 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 3045 } 3046 static bool classof(const Stmt *T) { 3047 return T->getStmtClass() == ConditionalOperatorClass; 3048 } 3049 static bool classof(const ConditionalOperator *) { return true; } 3050 3051 // Iterators 3052 child_range children() { 3053 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3054 } 3055 }; 3056 3057 /// BinaryConditionalOperator - The GNU extension to the conditional 3058 /// operator which allows the middle operand to be omitted. 3059 /// 3060 /// This is a different expression kind on the assumption that almost 3061 /// every client ends up needing to know that these are different. 3062 class BinaryConditionalOperator : public AbstractConditionalOperator { 3063 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3064 3065 /// - the common condition/left-hand-side expression, which will be 3066 /// evaluated as the opaque value 3067 /// - the condition, expressed in terms of the opaque value 3068 /// - the left-hand-side, expressed in terms of the opaque value 3069 /// - the right-hand-side 3070 Stmt *SubExprs[NUM_SUBEXPRS]; 3071 OpaqueValueExpr *OpaqueValue; 3072 3073 friend class ASTStmtReader; 3074 public: 3075 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3076 Expr *cond, Expr *lhs, Expr *rhs, 3077 SourceLocation qloc, SourceLocation cloc, 3078 QualType t, ExprValueKind VK, ExprObjectKind OK) 3079 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3080 (common->isTypeDependent() || rhs->isTypeDependent()), 3081 (common->isValueDependent() || rhs->isValueDependent()), 3082 (common->isInstantiationDependent() || 3083 rhs->isInstantiationDependent()), 3084 (common->containsUnexpandedParameterPack() || 3085 rhs->containsUnexpandedParameterPack()), 3086 qloc, cloc), 3087 OpaqueValue(opaqueValue) { 3088 SubExprs[COMMON] = common; 3089 SubExprs[COND] = cond; 3090 SubExprs[LHS] = lhs; 3091 SubExprs[RHS] = rhs; 3092 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value"); 3093 } 3094 3095 /// \brief Build an empty conditional operator. 3096 explicit BinaryConditionalOperator(EmptyShell Empty) 3097 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3098 3099 /// \brief getCommon - Return the common expression, written to the 3100 /// left of the condition. The opaque value will be bound to the 3101 /// result of this expression. 3102 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3103 3104 /// \brief getOpaqueValue - Return the opaque value placeholder. 3105 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3106 3107 /// \brief getCond - Return the condition expression; this is defined 3108 /// in terms of the opaque value. 3109 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3110 3111 /// \brief getTrueExpr - Return the subexpression which will be 3112 /// evaluated if the condition evaluates to true; this is defined 3113 /// in terms of the opaque value. 3114 Expr *getTrueExpr() const { 3115 return cast<Expr>(SubExprs[LHS]); 3116 } 3117 3118 /// \brief getFalseExpr - Return the subexpression which will be 3119 /// evaluated if the condnition evaluates to false; this is 3120 /// defined in terms of the opaque value. 3121 Expr *getFalseExpr() const { 3122 return cast<Expr>(SubExprs[RHS]); 3123 } 3124 3125 SourceRange getSourceRange() const LLVM_READONLY { 3126 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 3127 } 3128 static bool classof(const Stmt *T) { 3129 return T->getStmtClass() == BinaryConditionalOperatorClass; 3130 } 3131 static bool classof(const BinaryConditionalOperator *) { return true; } 3132 3133 // Iterators 3134 child_range children() { 3135 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3136 } 3137 }; 3138 3139 inline Expr *AbstractConditionalOperator::getCond() const { 3140 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3141 return co->getCond(); 3142 return cast<BinaryConditionalOperator>(this)->getCond(); 3143 } 3144 3145 inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3146 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3147 return co->getTrueExpr(); 3148 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3149 } 3150 3151 inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3152 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3153 return co->getFalseExpr(); 3154 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3155 } 3156 3157 /// AddrLabelExpr - The GNU address of label extension, representing &&label. 3158 class AddrLabelExpr : public Expr { 3159 SourceLocation AmpAmpLoc, LabelLoc; 3160 LabelDecl *Label; 3161 public: 3162 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3163 QualType t) 3164 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3165 false), 3166 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3167 3168 /// \brief Build an empty address of a label expression. 3169 explicit AddrLabelExpr(EmptyShell Empty) 3170 : Expr(AddrLabelExprClass, Empty) { } 3171 3172 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3173 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3174 SourceLocation getLabelLoc() const { return LabelLoc; } 3175 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3176 3177 SourceRange getSourceRange() const LLVM_READONLY { 3178 return SourceRange(AmpAmpLoc, LabelLoc); 3179 } 3180 3181 LabelDecl *getLabel() const { return Label; } 3182 void setLabel(LabelDecl *L) { Label = L; } 3183 3184 static bool classof(const Stmt *T) { 3185 return T->getStmtClass() == AddrLabelExprClass; 3186 } 3187 static bool classof(const AddrLabelExpr *) { return true; } 3188 3189 // Iterators 3190 child_range children() { return child_range(); } 3191 }; 3192 3193 /// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3194 /// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3195 /// takes the value of the last subexpression. 3196 /// 3197 /// A StmtExpr is always an r-value; values "returned" out of a 3198 /// StmtExpr will be copied. 3199 class StmtExpr : public Expr { 3200 Stmt *SubStmt; 3201 SourceLocation LParenLoc, RParenLoc; 3202 public: 3203 // FIXME: Does type-dependence need to be computed differently? 3204 // FIXME: Do we need to compute instantiation instantiation-dependence for 3205 // statements? (ugh!) 3206 StmtExpr(CompoundStmt *substmt, QualType T, 3207 SourceLocation lp, SourceLocation rp) : 3208 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3209 T->isDependentType(), false, false, false), 3210 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3211 3212 /// \brief Build an empty statement expression. 3213 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3214 3215 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3216 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3217 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3218 3219 SourceRange getSourceRange() const LLVM_READONLY { 3220 return SourceRange(LParenLoc, RParenLoc); 3221 } 3222 3223 SourceLocation getLParenLoc() const { return LParenLoc; } 3224 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3225 SourceLocation getRParenLoc() const { return RParenLoc; } 3226 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3227 3228 static bool classof(const Stmt *T) { 3229 return T->getStmtClass() == StmtExprClass; 3230 } 3231 static bool classof(const StmtExpr *) { return true; } 3232 3233 // Iterators 3234 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3235 }; 3236 3237 3238 /// ShuffleVectorExpr - clang-specific builtin-in function 3239 /// __builtin_shufflevector. 3240 /// This AST node represents a operator that does a constant 3241 /// shuffle, similar to LLVM's shufflevector instruction. It takes 3242 /// two vectors and a variable number of constant indices, 3243 /// and returns the appropriately shuffled vector. 3244 class ShuffleVectorExpr : public Expr { 3245 SourceLocation BuiltinLoc, RParenLoc; 3246 3247 // SubExprs - the list of values passed to the __builtin_shufflevector 3248 // function. The first two are vectors, and the rest are constant 3249 // indices. The number of values in this list is always 3250 // 2+the number of indices in the vector type. 3251 Stmt **SubExprs; 3252 unsigned NumExprs; 3253 3254 public: 3255 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3256 QualType Type, SourceLocation BLoc, 3257 SourceLocation RP); 3258 3259 /// \brief Build an empty vector-shuffle expression. 3260 explicit ShuffleVectorExpr(EmptyShell Empty) 3261 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3262 3263 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3264 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3265 3266 SourceLocation getRParenLoc() const { return RParenLoc; } 3267 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3268 3269 SourceRange getSourceRange() const LLVM_READONLY { 3270 return SourceRange(BuiltinLoc, RParenLoc); 3271 } 3272 static bool classof(const Stmt *T) { 3273 return T->getStmtClass() == ShuffleVectorExprClass; 3274 } 3275 static bool classof(const ShuffleVectorExpr *) { return true; } 3276 3277 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3278 /// constant expression, the actual arguments passed in, and the function 3279 /// pointers. 3280 unsigned getNumSubExprs() const { return NumExprs; } 3281 3282 /// \brief Retrieve the array of expressions. 3283 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3284 3285 /// getExpr - Return the Expr at the specified index. 3286 Expr *getExpr(unsigned Index) { 3287 assert((Index < NumExprs) && "Arg access out of range!"); 3288 return cast<Expr>(SubExprs[Index]); 3289 } 3290 const Expr *getExpr(unsigned Index) const { 3291 assert((Index < NumExprs) && "Arg access out of range!"); 3292 return cast<Expr>(SubExprs[Index]); 3293 } 3294 3295 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3296 3297 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3298 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3299 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3300 } 3301 3302 // Iterators 3303 child_range children() { 3304 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3305 } 3306 }; 3307 3308 /// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3309 /// This AST node is similar to the conditional operator (?:) in C, with 3310 /// the following exceptions: 3311 /// - the test expression must be a integer constant expression. 3312 /// - the expression returned acts like the chosen subexpression in every 3313 /// visible way: the type is the same as that of the chosen subexpression, 3314 /// and all predicates (whether it's an l-value, whether it's an integer 3315 /// constant expression, etc.) return the same result as for the chosen 3316 /// sub-expression. 3317 class ChooseExpr : public Expr { 3318 enum { COND, LHS, RHS, END_EXPR }; 3319 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3320 SourceLocation BuiltinLoc, RParenLoc; 3321 public: 3322 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3323 QualType t, ExprValueKind VK, ExprObjectKind OK, 3324 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3325 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3326 (cond->isInstantiationDependent() || 3327 lhs->isInstantiationDependent() || 3328 rhs->isInstantiationDependent()), 3329 (cond->containsUnexpandedParameterPack() || 3330 lhs->containsUnexpandedParameterPack() || 3331 rhs->containsUnexpandedParameterPack())), 3332 BuiltinLoc(BLoc), RParenLoc(RP) { 3333 SubExprs[COND] = cond; 3334 SubExprs[LHS] = lhs; 3335 SubExprs[RHS] = rhs; 3336 } 3337 3338 /// \brief Build an empty __builtin_choose_expr. 3339 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3340 3341 /// isConditionTrue - Return whether the condition is true (i.e. not 3342 /// equal to zero). 3343 bool isConditionTrue(const ASTContext &C) const; 3344 3345 /// getChosenSubExpr - Return the subexpression chosen according to the 3346 /// condition. 3347 Expr *getChosenSubExpr(const ASTContext &C) const { 3348 return isConditionTrue(C) ? getLHS() : getRHS(); 3349 } 3350 3351 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3352 void setCond(Expr *E) { SubExprs[COND] = E; } 3353 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3354 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3355 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3356 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3357 3358 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3359 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3360 3361 SourceLocation getRParenLoc() const { return RParenLoc; } 3362 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3363 3364 SourceRange getSourceRange() const LLVM_READONLY { 3365 return SourceRange(BuiltinLoc, RParenLoc); 3366 } 3367 static bool classof(const Stmt *T) { 3368 return T->getStmtClass() == ChooseExprClass; 3369 } 3370 static bool classof(const ChooseExpr *) { return true; } 3371 3372 // Iterators 3373 child_range children() { 3374 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3375 } 3376 }; 3377 3378 /// GNUNullExpr - Implements the GNU __null extension, which is a name 3379 /// for a null pointer constant that has integral type (e.g., int or 3380 /// long) and is the same size and alignment as a pointer. The __null 3381 /// extension is typically only used by system headers, which define 3382 /// NULL as __null in C++ rather than using 0 (which is an integer 3383 /// that may not match the size of a pointer). 3384 class GNUNullExpr : public Expr { 3385 /// TokenLoc - The location of the __null keyword. 3386 SourceLocation TokenLoc; 3387 3388 public: 3389 GNUNullExpr(QualType Ty, SourceLocation Loc) 3390 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3391 false), 3392 TokenLoc(Loc) { } 3393 3394 /// \brief Build an empty GNU __null expression. 3395 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3396 3397 /// getTokenLocation - The location of the __null token. 3398 SourceLocation getTokenLocation() const { return TokenLoc; } 3399 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3400 3401 SourceRange getSourceRange() const LLVM_READONLY { 3402 return SourceRange(TokenLoc); 3403 } 3404 static bool classof(const Stmt *T) { 3405 return T->getStmtClass() == GNUNullExprClass; 3406 } 3407 static bool classof(const GNUNullExpr *) { return true; } 3408 3409 // Iterators 3410 child_range children() { return child_range(); } 3411 }; 3412 3413 /// VAArgExpr, used for the builtin function __builtin_va_arg. 3414 class VAArgExpr : public Expr { 3415 Stmt *Val; 3416 TypeSourceInfo *TInfo; 3417 SourceLocation BuiltinLoc, RParenLoc; 3418 public: 3419 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3420 SourceLocation RPLoc, QualType t) 3421 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3422 t->isDependentType(), false, 3423 (TInfo->getType()->isInstantiationDependentType() || 3424 e->isInstantiationDependent()), 3425 (TInfo->getType()->containsUnexpandedParameterPack() || 3426 e->containsUnexpandedParameterPack())), 3427 Val(e), TInfo(TInfo), 3428 BuiltinLoc(BLoc), 3429 RParenLoc(RPLoc) { } 3430 3431 /// \brief Create an empty __builtin_va_arg expression. 3432 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3433 3434 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3435 Expr *getSubExpr() { return cast<Expr>(Val); } 3436 void setSubExpr(Expr *E) { Val = E; } 3437 3438 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3439 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3440 3441 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3442 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3443 3444 SourceLocation getRParenLoc() const { return RParenLoc; } 3445 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3446 3447 SourceRange getSourceRange() const LLVM_READONLY { 3448 return SourceRange(BuiltinLoc, RParenLoc); 3449 } 3450 static bool classof(const Stmt *T) { 3451 return T->getStmtClass() == VAArgExprClass; 3452 } 3453 static bool classof(const VAArgExpr *) { return true; } 3454 3455 // Iterators 3456 child_range children() { return child_range(&Val, &Val+1); } 3457 }; 3458 3459 /// @brief Describes an C or C++ initializer list. 3460 /// 3461 /// InitListExpr describes an initializer list, which can be used to 3462 /// initialize objects of different types, including 3463 /// struct/class/union types, arrays, and vectors. For example: 3464 /// 3465 /// @code 3466 /// struct foo x = { 1, { 2, 3 } }; 3467 /// @endcode 3468 /// 3469 /// Prior to semantic analysis, an initializer list will represent the 3470 /// initializer list as written by the user, but will have the 3471 /// placeholder type "void". This initializer list is called the 3472 /// syntactic form of the initializer, and may contain C99 designated 3473 /// initializers (represented as DesignatedInitExprs), initializations 3474 /// of subobject members without explicit braces, and so on. Clients 3475 /// interested in the original syntax of the initializer list should 3476 /// use the syntactic form of the initializer list. 3477 /// 3478 /// After semantic analysis, the initializer list will represent the 3479 /// semantic form of the initializer, where the initializations of all 3480 /// subobjects are made explicit with nested InitListExpr nodes and 3481 /// C99 designators have been eliminated by placing the designated 3482 /// initializations into the subobject they initialize. Additionally, 3483 /// any "holes" in the initialization, where no initializer has been 3484 /// specified for a particular subobject, will be replaced with 3485 /// implicitly-generated ImplicitValueInitExpr expressions that 3486 /// value-initialize the subobjects. Note, however, that the 3487 /// initializer lists may still have fewer initializers than there are 3488 /// elements to initialize within the object. 3489 /// 3490 /// Given the semantic form of the initializer list, one can retrieve 3491 /// the original syntactic form of that initializer list (if it 3492 /// exists) using getSyntacticForm(). Since many initializer lists 3493 /// have the same syntactic and semantic forms, getSyntacticForm() may 3494 /// return NULL, indicating that the current initializer list also 3495 /// serves as its syntactic form. 3496 class InitListExpr : public Expr { 3497 // FIXME: Eliminate this vector in favor of ASTContext allocation 3498 typedef ASTVector<Stmt *> InitExprsTy; 3499 InitExprsTy InitExprs; 3500 SourceLocation LBraceLoc, RBraceLoc; 3501 3502 /// Contains the initializer list that describes the syntactic form 3503 /// written in the source code. 3504 InitListExpr *SyntacticForm; 3505 3506 /// \brief Either: 3507 /// If this initializer list initializes an array with more elements than 3508 /// there are initializers in the list, specifies an expression to be used 3509 /// for value initialization of the rest of the elements. 3510 /// Or 3511 /// If this initializer list initializes a union, specifies which 3512 /// field within the union will be initialized. 3513 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3514 3515 public: 3516 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3517 Expr **initexprs, unsigned numinits, 3518 SourceLocation rbraceloc); 3519 3520 /// \brief Build an empty initializer list. 3521 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3522 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3523 3524 unsigned getNumInits() const { return InitExprs.size(); } 3525 3526 /// \brief Retrieve the set of initializers. 3527 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3528 3529 const Expr *getInit(unsigned Init) const { 3530 assert(Init < getNumInits() && "Initializer access out of range!"); 3531 return cast_or_null<Expr>(InitExprs[Init]); 3532 } 3533 3534 Expr *getInit(unsigned Init) { 3535 assert(Init < getNumInits() && "Initializer access out of range!"); 3536 return cast_or_null<Expr>(InitExprs[Init]); 3537 } 3538 3539 void setInit(unsigned Init, Expr *expr) { 3540 assert(Init < getNumInits() && "Initializer access out of range!"); 3541 InitExprs[Init] = expr; 3542 } 3543 3544 /// \brief Reserve space for some number of initializers. 3545 void reserveInits(ASTContext &C, unsigned NumInits); 3546 3547 /// @brief Specify the number of initializers 3548 /// 3549 /// If there are more than @p NumInits initializers, the remaining 3550 /// initializers will be destroyed. If there are fewer than @p 3551 /// NumInits initializers, NULL expressions will be added for the 3552 /// unknown initializers. 3553 void resizeInits(ASTContext &Context, unsigned NumInits); 3554 3555 /// @brief Updates the initializer at index @p Init with the new 3556 /// expression @p expr, and returns the old expression at that 3557 /// location. 3558 /// 3559 /// When @p Init is out of range for this initializer list, the 3560 /// initializer list will be extended with NULL expressions to 3561 /// accommodate the new entry. 3562 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3563 3564 /// \brief If this initializer list initializes an array with more elements 3565 /// than there are initializers in the list, specifies an expression to be 3566 /// used for value initialization of the rest of the elements. 3567 Expr *getArrayFiller() { 3568 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3569 } 3570 const Expr *getArrayFiller() const { 3571 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3572 } 3573 void setArrayFiller(Expr *filler); 3574 3575 /// \brief Return true if this is an array initializer and its array "filler" 3576 /// has been set. 3577 bool hasArrayFiller() const { return getArrayFiller(); } 3578 3579 /// \brief If this initializes a union, specifies which field in the 3580 /// union to initialize. 3581 /// 3582 /// Typically, this field is the first named field within the 3583 /// union. However, a designated initializer can specify the 3584 /// initialization of a different field within the union. 3585 FieldDecl *getInitializedFieldInUnion() { 3586 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3587 } 3588 const FieldDecl *getInitializedFieldInUnion() const { 3589 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3590 } 3591 void setInitializedFieldInUnion(FieldDecl *FD) { 3592 ArrayFillerOrUnionFieldInit = FD; 3593 } 3594 3595 // Explicit InitListExpr's originate from source code (and have valid source 3596 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3597 bool isExplicit() { 3598 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3599 } 3600 3601 // Is this an initializer for an array of characters, initialized by a string 3602 // literal or an @encode? 3603 bool isStringLiteralInit() const; 3604 3605 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3606 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3607 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3608 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3609 3610 /// @brief Retrieve the initializer list that describes the 3611 /// syntactic form of the initializer. 3612 /// 3613 /// 3614 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3615 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3616 3617 bool hadArrayRangeDesignator() const { 3618 return InitListExprBits.HadArrayRangeDesignator != 0; 3619 } 3620 void sawArrayRangeDesignator(bool ARD = true) { 3621 InitListExprBits.HadArrayRangeDesignator = ARD; 3622 } 3623 3624 bool initializesStdInitializerList() const { 3625 return InitListExprBits.InitializesStdInitializerList != 0; 3626 } 3627 void setInitializesStdInitializerList(bool ISIL = true) { 3628 InitListExprBits.InitializesStdInitializerList = ISIL; 3629 } 3630 3631 SourceRange getSourceRange() const LLVM_READONLY; 3632 3633 static bool classof(const Stmt *T) { 3634 return T->getStmtClass() == InitListExprClass; 3635 } 3636 static bool classof(const InitListExpr *) { return true; } 3637 3638 // Iterators 3639 child_range children() { 3640 if (InitExprs.empty()) return child_range(); 3641 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3642 } 3643 3644 typedef InitExprsTy::iterator iterator; 3645 typedef InitExprsTy::const_iterator const_iterator; 3646 typedef InitExprsTy::reverse_iterator reverse_iterator; 3647 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3648 3649 iterator begin() { return InitExprs.begin(); } 3650 const_iterator begin() const { return InitExprs.begin(); } 3651 iterator end() { return InitExprs.end(); } 3652 const_iterator end() const { return InitExprs.end(); } 3653 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3654 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3655 reverse_iterator rend() { return InitExprs.rend(); } 3656 const_reverse_iterator rend() const { return InitExprs.rend(); } 3657 3658 friend class ASTStmtReader; 3659 friend class ASTStmtWriter; 3660 }; 3661 3662 /// @brief Represents a C99 designated initializer expression. 3663 /// 3664 /// A designated initializer expression (C99 6.7.8) contains one or 3665 /// more designators (which can be field designators, array 3666 /// designators, or GNU array-range designators) followed by an 3667 /// expression that initializes the field or element(s) that the 3668 /// designators refer to. For example, given: 3669 /// 3670 /// @code 3671 /// struct point { 3672 /// double x; 3673 /// double y; 3674 /// }; 3675 /// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3676 /// @endcode 3677 /// 3678 /// The InitListExpr contains three DesignatedInitExprs, the first of 3679 /// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3680 /// designators, one array designator for @c [2] followed by one field 3681 /// designator for @c .y. The initalization expression will be 1.0. 3682 class DesignatedInitExpr : public Expr { 3683 public: 3684 /// \brief Forward declaration of the Designator class. 3685 class Designator; 3686 3687 private: 3688 /// The location of the '=' or ':' prior to the actual initializer 3689 /// expression. 3690 SourceLocation EqualOrColonLoc; 3691 3692 /// Whether this designated initializer used the GNU deprecated 3693 /// syntax rather than the C99 '=' syntax. 3694 bool GNUSyntax : 1; 3695 3696 /// The number of designators in this initializer expression. 3697 unsigned NumDesignators : 15; 3698 3699 /// The number of subexpressions of this initializer expression, 3700 /// which contains both the initializer and any additional 3701 /// expressions used by array and array-range designators. 3702 unsigned NumSubExprs : 16; 3703 3704 /// \brief The designators in this designated initialization 3705 /// expression. 3706 Designator *Designators; 3707 3708 3709 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3710 const Designator *Designators, 3711 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3712 Expr **IndexExprs, unsigned NumIndexExprs, 3713 Expr *Init); 3714 3715 explicit DesignatedInitExpr(unsigned NumSubExprs) 3716 : Expr(DesignatedInitExprClass, EmptyShell()), 3717 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(0) { } 3718 3719 public: 3720 /// A field designator, e.g., ".x". 3721 struct FieldDesignator { 3722 /// Refers to the field that is being initialized. The low bit 3723 /// of this field determines whether this is actually a pointer 3724 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3725 /// initially constructed, a field designator will store an 3726 /// IdentifierInfo*. After semantic analysis has resolved that 3727 /// name, the field designator will instead store a FieldDecl*. 3728 uintptr_t NameOrField; 3729 3730 /// The location of the '.' in the designated initializer. 3731 unsigned DotLoc; 3732 3733 /// The location of the field name in the designated initializer. 3734 unsigned FieldLoc; 3735 }; 3736 3737 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3738 struct ArrayOrRangeDesignator { 3739 /// Location of the first index expression within the designated 3740 /// initializer expression's list of subexpressions. 3741 unsigned Index; 3742 /// The location of the '[' starting the array range designator. 3743 unsigned LBracketLoc; 3744 /// The location of the ellipsis separating the start and end 3745 /// indices. Only valid for GNU array-range designators. 3746 unsigned EllipsisLoc; 3747 /// The location of the ']' terminating the array range designator. 3748 unsigned RBracketLoc; 3749 }; 3750 3751 /// @brief Represents a single C99 designator. 3752 /// 3753 /// @todo This class is infuriatingly similar to clang::Designator, 3754 /// but minor differences (storing indices vs. storing pointers) 3755 /// keep us from reusing it. Try harder, later, to rectify these 3756 /// differences. 3757 class Designator { 3758 /// @brief The kind of designator this describes. 3759 enum { 3760 FieldDesignator, 3761 ArrayDesignator, 3762 ArrayRangeDesignator 3763 } Kind; 3764 3765 union { 3766 /// A field designator, e.g., ".x". 3767 struct FieldDesignator Field; 3768 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3769 struct ArrayOrRangeDesignator ArrayOrRange; 3770 }; 3771 friend class DesignatedInitExpr; 3772 3773 public: 3774 Designator() {} 3775 3776 /// @brief Initializes a field designator. 3777 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3778 SourceLocation FieldLoc) 3779 : Kind(FieldDesignator) { 3780 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3781 Field.DotLoc = DotLoc.getRawEncoding(); 3782 Field.FieldLoc = FieldLoc.getRawEncoding(); 3783 } 3784 3785 /// @brief Initializes an array designator. 3786 Designator(unsigned Index, SourceLocation LBracketLoc, 3787 SourceLocation RBracketLoc) 3788 : Kind(ArrayDesignator) { 3789 ArrayOrRange.Index = Index; 3790 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3791 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3792 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3793 } 3794 3795 /// @brief Initializes a GNU array-range designator. 3796 Designator(unsigned Index, SourceLocation LBracketLoc, 3797 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3798 : Kind(ArrayRangeDesignator) { 3799 ArrayOrRange.Index = Index; 3800 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3801 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3802 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3803 } 3804 3805 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3806 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3807 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3808 3809 IdentifierInfo *getFieldName() const; 3810 3811 FieldDecl *getField() const { 3812 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3813 if (Field.NameOrField & 0x01) 3814 return 0; 3815 else 3816 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3817 } 3818 3819 void setField(FieldDecl *FD) { 3820 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3821 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3822 } 3823 3824 SourceLocation getDotLoc() const { 3825 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3826 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3827 } 3828 3829 SourceLocation getFieldLoc() const { 3830 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3831 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3832 } 3833 3834 SourceLocation getLBracketLoc() const { 3835 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3836 "Only valid on an array or array-range designator"); 3837 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3838 } 3839 3840 SourceLocation getRBracketLoc() const { 3841 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3842 "Only valid on an array or array-range designator"); 3843 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3844 } 3845 3846 SourceLocation getEllipsisLoc() const { 3847 assert(Kind == ArrayRangeDesignator && 3848 "Only valid on an array-range designator"); 3849 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3850 } 3851 3852 unsigned getFirstExprIndex() const { 3853 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3854 "Only valid on an array or array-range designator"); 3855 return ArrayOrRange.Index; 3856 } 3857 3858 SourceLocation getStartLocation() const { 3859 if (Kind == FieldDesignator) 3860 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3861 else 3862 return getLBracketLoc(); 3863 } 3864 SourceLocation getEndLocation() const { 3865 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3866 } 3867 SourceRange getSourceRange() const LLVM_READONLY { 3868 return SourceRange(getStartLocation(), getEndLocation()); 3869 } 3870 }; 3871 3872 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3873 unsigned NumDesignators, 3874 Expr **IndexExprs, unsigned NumIndexExprs, 3875 SourceLocation EqualOrColonLoc, 3876 bool GNUSyntax, Expr *Init); 3877 3878 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3879 3880 /// @brief Returns the number of designators in this initializer. 3881 unsigned size() const { return NumDesignators; } 3882 3883 // Iterator access to the designators. 3884 typedef Designator *designators_iterator; 3885 designators_iterator designators_begin() { return Designators; } 3886 designators_iterator designators_end() { 3887 return Designators + NumDesignators; 3888 } 3889 3890 typedef const Designator *const_designators_iterator; 3891 const_designators_iterator designators_begin() const { return Designators; } 3892 const_designators_iterator designators_end() const { 3893 return Designators + NumDesignators; 3894 } 3895 3896 typedef std::reverse_iterator<designators_iterator> 3897 reverse_designators_iterator; 3898 reverse_designators_iterator designators_rbegin() { 3899 return reverse_designators_iterator(designators_end()); 3900 } 3901 reverse_designators_iterator designators_rend() { 3902 return reverse_designators_iterator(designators_begin()); 3903 } 3904 3905 typedef std::reverse_iterator<const_designators_iterator> 3906 const_reverse_designators_iterator; 3907 const_reverse_designators_iterator designators_rbegin() const { 3908 return const_reverse_designators_iterator(designators_end()); 3909 } 3910 const_reverse_designators_iterator designators_rend() const { 3911 return const_reverse_designators_iterator(designators_begin()); 3912 } 3913 3914 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3915 3916 void setDesignators(ASTContext &C, const Designator *Desigs, 3917 unsigned NumDesigs); 3918 3919 Expr *getArrayIndex(const Designator& D); 3920 Expr *getArrayRangeStart(const Designator& D); 3921 Expr *getArrayRangeEnd(const Designator& D); 3922 3923 /// @brief Retrieve the location of the '=' that precedes the 3924 /// initializer value itself, if present. 3925 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3926 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3927 3928 /// @brief Determines whether this designated initializer used the 3929 /// deprecated GNU syntax for designated initializers. 3930 bool usesGNUSyntax() const { return GNUSyntax; } 3931 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3932 3933 /// @brief Retrieve the initializer value. 3934 Expr *getInit() const { 3935 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3936 } 3937 3938 void setInit(Expr *init) { 3939 *child_begin() = init; 3940 } 3941 3942 /// \brief Retrieve the total number of subexpressions in this 3943 /// designated initializer expression, including the actual 3944 /// initialized value and any expressions that occur within array 3945 /// and array-range designators. 3946 unsigned getNumSubExprs() const { return NumSubExprs; } 3947 3948 Expr *getSubExpr(unsigned Idx) { 3949 assert(Idx < NumSubExprs && "Subscript out of range"); 3950 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3951 Ptr += sizeof(DesignatedInitExpr); 3952 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3953 } 3954 3955 void setSubExpr(unsigned Idx, Expr *E) { 3956 assert(Idx < NumSubExprs && "Subscript out of range"); 3957 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3958 Ptr += sizeof(DesignatedInitExpr); 3959 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3960 } 3961 3962 /// \brief Replaces the designator at index @p Idx with the series 3963 /// of designators in [First, Last). 3964 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3965 const Designator *Last); 3966 3967 SourceRange getDesignatorsSourceRange() const; 3968 3969 SourceRange getSourceRange() const LLVM_READONLY; 3970 3971 static bool classof(const Stmt *T) { 3972 return T->getStmtClass() == DesignatedInitExprClass; 3973 } 3974 static bool classof(const DesignatedInitExpr *) { return true; } 3975 3976 // Iterators 3977 child_range children() { 3978 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3979 return child_range(begin, begin + NumSubExprs); 3980 } 3981 }; 3982 3983 /// \brief Represents an implicitly-generated value initialization of 3984 /// an object of a given type. 3985 /// 3986 /// Implicit value initializations occur within semantic initializer 3987 /// list expressions (InitListExpr) as placeholders for subobject 3988 /// initializations not explicitly specified by the user. 3989 /// 3990 /// \see InitListExpr 3991 class ImplicitValueInitExpr : public Expr { 3992 public: 3993 explicit ImplicitValueInitExpr(QualType ty) 3994 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3995 false, false, ty->isInstantiationDependentType(), false) { } 3996 3997 /// \brief Construct an empty implicit value initialization. 3998 explicit ImplicitValueInitExpr(EmptyShell Empty) 3999 : Expr(ImplicitValueInitExprClass, Empty) { } 4000 4001 static bool classof(const Stmt *T) { 4002 return T->getStmtClass() == ImplicitValueInitExprClass; 4003 } 4004 static bool classof(const ImplicitValueInitExpr *) { return true; } 4005 4006 SourceRange getSourceRange() const LLVM_READONLY { 4007 return SourceRange(); 4008 } 4009 4010 // Iterators 4011 child_range children() { return child_range(); } 4012 }; 4013 4014 4015 class ParenListExpr : public Expr { 4016 Stmt **Exprs; 4017 unsigned NumExprs; 4018 SourceLocation LParenLoc, RParenLoc; 4019 4020 public: 4021 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 4022 unsigned numexprs, SourceLocation rparenloc); 4023 4024 /// \brief Build an empty paren list. 4025 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 4026 4027 unsigned getNumExprs() const { return NumExprs; } 4028 4029 const Expr* getExpr(unsigned Init) const { 4030 assert(Init < getNumExprs() && "Initializer access out of range!"); 4031 return cast_or_null<Expr>(Exprs[Init]); 4032 } 4033 4034 Expr* getExpr(unsigned Init) { 4035 assert(Init < getNumExprs() && "Initializer access out of range!"); 4036 return cast_or_null<Expr>(Exprs[Init]); 4037 } 4038 4039 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 4040 4041 SourceLocation getLParenLoc() const { return LParenLoc; } 4042 SourceLocation getRParenLoc() const { return RParenLoc; } 4043 4044 SourceRange getSourceRange() const LLVM_READONLY { 4045 return SourceRange(LParenLoc, RParenLoc); 4046 } 4047 static bool classof(const Stmt *T) { 4048 return T->getStmtClass() == ParenListExprClass; 4049 } 4050 static bool classof(const ParenListExpr *) { return true; } 4051 4052 // Iterators 4053 child_range children() { 4054 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4055 } 4056 4057 friend class ASTStmtReader; 4058 friend class ASTStmtWriter; 4059 }; 4060 4061 4062 /// \brief Represents a C11 generic selection. 4063 /// 4064 /// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4065 /// expression, followed by one or more generic associations. Each generic 4066 /// association specifies a type name and an expression, or "default" and an 4067 /// expression (in which case it is known as a default generic association). 4068 /// The type and value of the generic selection are identical to those of its 4069 /// result expression, which is defined as the expression in the generic 4070 /// association with a type name that is compatible with the type of the 4071 /// controlling expression, or the expression in the default generic association 4072 /// if no types are compatible. For example: 4073 /// 4074 /// @code 4075 /// _Generic(X, double: 1, float: 2, default: 3) 4076 /// @endcode 4077 /// 4078 /// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4079 /// or 3 if "hello". 4080 /// 4081 /// As an extension, generic selections are allowed in C++, where the following 4082 /// additional semantics apply: 4083 /// 4084 /// Any generic selection whose controlling expression is type-dependent or 4085 /// which names a dependent type in its association list is result-dependent, 4086 /// which means that the choice of result expression is dependent. 4087 /// Result-dependent generic associations are both type- and value-dependent. 4088 class GenericSelectionExpr : public Expr { 4089 enum { CONTROLLING, END_EXPR }; 4090 TypeSourceInfo **AssocTypes; 4091 Stmt **SubExprs; 4092 unsigned NumAssocs, ResultIndex; 4093 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4094 4095 public: 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 unsigned ResultIndex); 4103 4104 /// This constructor is used in the result-dependent case. 4105 GenericSelectionExpr(ASTContext &Context, 4106 SourceLocation GenericLoc, Expr *ControllingExpr, 4107 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4108 unsigned NumAssocs, SourceLocation DefaultLoc, 4109 SourceLocation RParenLoc, 4110 bool ContainsUnexpandedParameterPack); 4111 4112 explicit GenericSelectionExpr(EmptyShell Empty) 4113 : Expr(GenericSelectionExprClass, Empty) { } 4114 4115 unsigned getNumAssocs() const { return NumAssocs; } 4116 4117 SourceLocation getGenericLoc() const { return GenericLoc; } 4118 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4119 SourceLocation getRParenLoc() const { return RParenLoc; } 4120 4121 const Expr *getAssocExpr(unsigned i) const { 4122 return cast<Expr>(SubExprs[END_EXPR+i]); 4123 } 4124 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4125 4126 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4127 return AssocTypes[i]; 4128 } 4129 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4130 4131 QualType getAssocType(unsigned i) const { 4132 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4133 return TS->getType(); 4134 else 4135 return QualType(); 4136 } 4137 4138 const Expr *getControllingExpr() const { 4139 return cast<Expr>(SubExprs[CONTROLLING]); 4140 } 4141 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4142 4143 /// Whether this generic selection is result-dependent. 4144 bool isResultDependent() const { return ResultIndex == -1U; } 4145 4146 /// The zero-based index of the result expression's generic association in 4147 /// the generic selection's association list. Defined only if the 4148 /// generic selection is not result-dependent. 4149 unsigned getResultIndex() const { 4150 assert(!isResultDependent() && "Generic selection is result-dependent"); 4151 return ResultIndex; 4152 } 4153 4154 /// The generic selection's result expression. Defined only if the 4155 /// generic selection is not result-dependent. 4156 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4157 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4158 4159 SourceRange getSourceRange() const LLVM_READONLY { 4160 return SourceRange(GenericLoc, RParenLoc); 4161 } 4162 static bool classof(const Stmt *T) { 4163 return T->getStmtClass() == GenericSelectionExprClass; 4164 } 4165 static bool classof(const GenericSelectionExpr *) { return true; } 4166 4167 child_range children() { 4168 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4169 } 4170 4171 friend class ASTStmtReader; 4172 }; 4173 4174 //===----------------------------------------------------------------------===// 4175 // Clang Extensions 4176 //===----------------------------------------------------------------------===// 4177 4178 4179 /// ExtVectorElementExpr - This represents access to specific elements of a 4180 /// vector, and may occur on the left hand side or right hand side. For example 4181 /// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4182 /// 4183 /// Note that the base may have either vector or pointer to vector type, just 4184 /// like a struct field reference. 4185 /// 4186 class ExtVectorElementExpr : public Expr { 4187 Stmt *Base; 4188 IdentifierInfo *Accessor; 4189 SourceLocation AccessorLoc; 4190 public: 4191 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4192 IdentifierInfo &accessor, SourceLocation loc) 4193 : Expr(ExtVectorElementExprClass, ty, VK, 4194 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4195 base->isTypeDependent(), base->isValueDependent(), 4196 base->isInstantiationDependent(), 4197 base->containsUnexpandedParameterPack()), 4198 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4199 4200 /// \brief Build an empty vector element expression. 4201 explicit ExtVectorElementExpr(EmptyShell Empty) 4202 : Expr(ExtVectorElementExprClass, Empty) { } 4203 4204 const Expr *getBase() const { return cast<Expr>(Base); } 4205 Expr *getBase() { return cast<Expr>(Base); } 4206 void setBase(Expr *E) { Base = E; } 4207 4208 IdentifierInfo &getAccessor() const { return *Accessor; } 4209 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4210 4211 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4212 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4213 4214 /// getNumElements - Get the number of components being selected. 4215 unsigned getNumElements() const; 4216 4217 /// containsDuplicateElements - Return true if any element access is 4218 /// repeated. 4219 bool containsDuplicateElements() const; 4220 4221 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4222 /// aggregate Constant of ConstantInt(s). 4223 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4224 4225 SourceRange getSourceRange() const LLVM_READONLY { 4226 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4227 } 4228 4229 /// isArrow - Return true if the base expression is a pointer to vector, 4230 /// return false if the base expression is a vector. 4231 bool isArrow() const; 4232 4233 static bool classof(const Stmt *T) { 4234 return T->getStmtClass() == ExtVectorElementExprClass; 4235 } 4236 static bool classof(const ExtVectorElementExpr *) { return true; } 4237 4238 // Iterators 4239 child_range children() { return child_range(&Base, &Base+1); } 4240 }; 4241 4242 4243 /// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4244 /// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4245 class BlockExpr : public Expr { 4246 protected: 4247 BlockDecl *TheBlock; 4248 public: 4249 BlockExpr(BlockDecl *BD, QualType ty) 4250 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4251 ty->isDependentType(), ty->isDependentType(), 4252 ty->isInstantiationDependentType() || BD->isDependentContext(), 4253 false), 4254 TheBlock(BD) {} 4255 4256 /// \brief Build an empty block expression. 4257 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4258 4259 const BlockDecl *getBlockDecl() const { return TheBlock; } 4260 BlockDecl *getBlockDecl() { return TheBlock; } 4261 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4262 4263 // Convenience functions for probing the underlying BlockDecl. 4264 SourceLocation getCaretLocation() const; 4265 const Stmt *getBody() const; 4266 Stmt *getBody(); 4267 4268 SourceRange getSourceRange() const LLVM_READONLY { 4269 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4270 } 4271 4272 /// getFunctionType - Return the underlying function type for this block. 4273 const FunctionProtoType *getFunctionType() const; 4274 4275 static bool classof(const Stmt *T) { 4276 return T->getStmtClass() == BlockExprClass; 4277 } 4278 static bool classof(const BlockExpr *) { return true; } 4279 4280 // Iterators 4281 child_range children() { return child_range(); } 4282 }; 4283 4284 /// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4285 /// This AST node provides support for reinterpreting a type to another 4286 /// type of the same size. 4287 class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4288 private: 4289 Stmt *SrcExpr; 4290 SourceLocation BuiltinLoc, RParenLoc; 4291 4292 friend class ASTReader; 4293 friend class ASTStmtReader; 4294 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4295 4296 public: 4297 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4298 ExprValueKind VK, ExprObjectKind OK, 4299 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4300 : Expr(AsTypeExprClass, DstType, VK, OK, 4301 DstType->isDependentType(), 4302 DstType->isDependentType() || SrcExpr->isValueDependent(), 4303 (DstType->isInstantiationDependentType() || 4304 SrcExpr->isInstantiationDependent()), 4305 (DstType->containsUnexpandedParameterPack() || 4306 SrcExpr->containsUnexpandedParameterPack())), 4307 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4308 4309 /// getSrcExpr - Return the Expr to be converted. 4310 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4311 4312 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4313 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4314 4315 /// getRParenLoc - Return the location of final right parenthesis. 4316 SourceLocation getRParenLoc() const { return RParenLoc; } 4317 4318 SourceRange getSourceRange() const LLVM_READONLY { 4319 return SourceRange(BuiltinLoc, RParenLoc); 4320 } 4321 4322 static bool classof(const Stmt *T) { 4323 return T->getStmtClass() == AsTypeExprClass; 4324 } 4325 static bool classof(const AsTypeExpr *) { return true; } 4326 4327 // Iterators 4328 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4329 }; 4330 4331 /// PseudoObjectExpr - An expression which accesses a pseudo-object 4332 /// l-value. A pseudo-object is an abstract object, accesses to which 4333 /// are translated to calls. The pseudo-object expression has a 4334 /// syntactic form, which shows how the expression was actually 4335 /// written in the source code, and a semantic form, which is a series 4336 /// of expressions to be executed in order which detail how the 4337 /// operation is actually evaluated. Optionally, one of the semantic 4338 /// forms may also provide a result value for the expression. 4339 /// 4340 /// If any of the semantic-form expressions is an OpaqueValueExpr, 4341 /// that OVE is required to have a source expression, and it is bound 4342 /// to the result of that source expression. Such OVEs may appear 4343 /// only in subsequent semantic-form expressions and as 4344 /// sub-expressions of the syntactic form. 4345 /// 4346 /// PseudoObjectExpr should be used only when an operation can be 4347 /// usefully described in terms of fairly simple rewrite rules on 4348 /// objects and functions that are meant to be used by end-developers. 4349 /// For example, under the Itanium ABI, dynamic casts are implemented 4350 /// as a call to a runtime function called __dynamic_cast; using this 4351 /// class to describe that would be inappropriate because that call is 4352 /// not really part of the user-visible semantics, and instead the 4353 /// cast is properly reflected in the AST and IR-generation has been 4354 /// taught to generate the call as necessary. In contrast, an 4355 /// Objective-C property access is semantically defined to be 4356 /// equivalent to a particular message send, and this is very much 4357 /// part of the user model. The name of this class encourages this 4358 /// modelling design. 4359 class PseudoObjectExpr : public Expr { 4360 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4361 // Always at least two, because the first sub-expression is the 4362 // syntactic form. 4363 4364 // PseudoObjectExprBits.ResultIndex - The index of the 4365 // sub-expression holding the result. 0 means the result is void, 4366 // which is unambiguous because it's the index of the syntactic 4367 // form. Note that this is therefore 1 higher than the value passed 4368 // in to Create, which is an index within the semantic forms. 4369 // Note also that ASTStmtWriter assumes this encoding. 4370 4371 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); } 4372 const Expr * const *getSubExprsBuffer() const { 4373 return reinterpret_cast<const Expr * const *>(this + 1); 4374 } 4375 4376 friend class ASTStmtReader; 4377 4378 PseudoObjectExpr(QualType type, ExprValueKind VK, 4379 Expr *syntactic, ArrayRef<Expr*> semantic, 4380 unsigned resultIndex); 4381 4382 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4383 4384 unsigned getNumSubExprs() const { 4385 return PseudoObjectExprBits.NumSubExprs; 4386 } 4387 4388 public: 4389 /// NoResult - A value for the result index indicating that there is 4390 /// no semantic result. 4391 enum { NoResult = ~0U }; 4392 4393 static PseudoObjectExpr *Create(ASTContext &Context, Expr *syntactic, 4394 ArrayRef<Expr*> semantic, 4395 unsigned resultIndex); 4396 4397 static PseudoObjectExpr *Create(ASTContext &Context, EmptyShell shell, 4398 unsigned numSemanticExprs); 4399 4400 /// Return the syntactic form of this expression, i.e. the 4401 /// expression it actually looks like. Likely to be expressed in 4402 /// terms of OpaqueValueExprs bound in the semantic form. 4403 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 4404 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 4405 4406 /// Return the index of the result-bearing expression into the semantics 4407 /// expressions, or PseudoObjectExpr::NoResult if there is none. 4408 unsigned getResultExprIndex() const { 4409 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 4410 return PseudoObjectExprBits.ResultIndex - 1; 4411 } 4412 4413 /// Return the result-bearing expression, or null if there is none. 4414 Expr *getResultExpr() { 4415 if (PseudoObjectExprBits.ResultIndex == 0) 4416 return 0; 4417 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 4418 } 4419 const Expr *getResultExpr() const { 4420 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 4421 } 4422 4423 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 4424 4425 typedef Expr * const *semantics_iterator; 4426 typedef const Expr * const *const_semantics_iterator; 4427 semantics_iterator semantics_begin() { 4428 return getSubExprsBuffer() + 1; 4429 } 4430 const_semantics_iterator semantics_begin() const { 4431 return getSubExprsBuffer() + 1; 4432 } 4433 semantics_iterator semantics_end() { 4434 return getSubExprsBuffer() + getNumSubExprs(); 4435 } 4436 const_semantics_iterator semantics_end() const { 4437 return getSubExprsBuffer() + getNumSubExprs(); 4438 } 4439 Expr *getSemanticExpr(unsigned index) { 4440 assert(index + 1 < getNumSubExprs()); 4441 return getSubExprsBuffer()[index + 1]; 4442 } 4443 const Expr *getSemanticExpr(unsigned index) const { 4444 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 4445 } 4446 4447 SourceLocation getExprLoc() const LLVM_READONLY { 4448 return getSyntacticForm()->getExprLoc(); 4449 } 4450 SourceRange getSourceRange() const LLVM_READONLY { 4451 return getSyntacticForm()->getSourceRange(); 4452 } 4453 4454 child_range children() { 4455 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer()); 4456 return child_range(cs, cs + getNumSubExprs()); 4457 } 4458 4459 static bool classof(const Stmt *T) { 4460 return T->getStmtClass() == PseudoObjectExprClass; 4461 } 4462 static bool classof(const PseudoObjectExpr *) { return true; } 4463 }; 4464 4465 /// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4466 /// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4467 /// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>. 4468 /// All of these instructions take one primary pointer and at least one memory 4469 /// order. 4470 class AtomicExpr : public Expr { 4471 public: 4472 enum AtomicOp { 4473 #define BUILTIN(ID, TYPE, ATTRS) 4474 #define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID, 4475 #include "clang/Basic/Builtins.def" 4476 // Avoid trailing comma 4477 BI_First = 0 4478 }; 4479 4480 private: 4481 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR }; 4482 Stmt* SubExprs[END_EXPR]; 4483 unsigned NumSubExprs; 4484 SourceLocation BuiltinLoc, RParenLoc; 4485 AtomicOp Op; 4486 4487 friend class ASTStmtReader; 4488 4489 public: 4490 AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, QualType t, 4491 AtomicOp op, SourceLocation RP); 4492 4493 /// \brief Determine the number of arguments the specified atomic builtin 4494 /// should have. 4495 static unsigned getNumSubExprs(AtomicOp Op); 4496 4497 /// \brief Build an empty AtomicExpr. 4498 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4499 4500 Expr *getPtr() const { 4501 return cast<Expr>(SubExprs[PTR]); 4502 } 4503 Expr *getOrder() const { 4504 return cast<Expr>(SubExprs[ORDER]); 4505 } 4506 Expr *getVal1() const { 4507 if (Op == AO__c11_atomic_init) 4508 return cast<Expr>(SubExprs[ORDER]); 4509 assert(NumSubExprs > VAL1); 4510 return cast<Expr>(SubExprs[VAL1]); 4511 } 4512 Expr *getOrderFail() const { 4513 assert(NumSubExprs > ORDER_FAIL); 4514 return cast<Expr>(SubExprs[ORDER_FAIL]); 4515 } 4516 Expr *getVal2() const { 4517 if (Op == AO__atomic_exchange) 4518 return cast<Expr>(SubExprs[ORDER_FAIL]); 4519 assert(NumSubExprs > VAL2); 4520 return cast<Expr>(SubExprs[VAL2]); 4521 } 4522 Expr *getWeak() const { 4523 assert(NumSubExprs > WEAK); 4524 return cast<Expr>(SubExprs[WEAK]); 4525 } 4526 4527 AtomicOp getOp() const { return Op; } 4528 unsigned getNumSubExprs() { return NumSubExprs; } 4529 4530 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4531 4532 bool isVolatile() const { 4533 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4534 } 4535 4536 bool isCmpXChg() const { 4537 return getOp() == AO__c11_atomic_compare_exchange_strong || 4538 getOp() == AO__c11_atomic_compare_exchange_weak || 4539 getOp() == AO__atomic_compare_exchange || 4540 getOp() == AO__atomic_compare_exchange_n; 4541 } 4542 4543 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4544 SourceLocation getRParenLoc() const { return RParenLoc; } 4545 4546 SourceRange getSourceRange() const LLVM_READONLY { 4547 return SourceRange(BuiltinLoc, RParenLoc); 4548 } 4549 static bool classof(const Stmt *T) { 4550 return T->getStmtClass() == AtomicExprClass; 4551 } 4552 static bool classof(const AtomicExpr *) { return true; } 4553 4554 // Iterators 4555 child_range children() { 4556 return child_range(SubExprs, SubExprs+NumSubExprs); 4557 } 4558 }; 4559 } // end namespace clang 4560 4561 #endif 4562