Expr.h revision a6115068cde719142eb394db88612c185cabd05b
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 33namespace clang { 34 class ASTContext; 35 class APValue; 36 class Decl; 37 class IdentifierInfo; 38 class ParmVarDecl; 39 class NamedDecl; 40 class ValueDecl; 41 class BlockDecl; 42 class CXXBaseSpecifier; 43 class CXXOperatorCallExpr; 44 class CXXMemberCallExpr; 45 class ObjCPropertyRefExpr; 46 class OpaqueValueExpr; 47 48/// \brief A simple array of base specifiers. 49typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 50 51/// Expr - This represents one expression. Note that Expr's are subclasses of 52/// Stmt. This allows an expression to be transparently used any place a Stmt 53/// is required. 54/// 55class Expr : public Stmt { 56 QualType TR; 57 58protected: 59 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 60 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 61 : Stmt(SC) 62 { 63 ExprBits.TypeDependent = TD; 64 ExprBits.ValueDependent = VD; 65 ExprBits.InstantiationDependent = ID; 66 ExprBits.ValueKind = VK; 67 ExprBits.ObjectKind = OK; 68 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 69 setType(T); 70 } 71 72 /// \brief Construct an empty expression. 73 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 74 75public: 76 QualType getType() const { return TR; } 77 void setType(QualType t) { 78 // In C++, the type of an expression is always adjusted so that it 79 // will not have reference type an expression will never have 80 // reference type (C++ [expr]p6). Use 81 // QualType::getNonReferenceType() to retrieve the non-reference 82 // type. Additionally, inspect Expr::isLvalue to determine whether 83 // an expression that is adjusted in this manner should be 84 // considered an lvalue. 85 assert((t.isNull() || !t->isReferenceType()) && 86 "Expressions can't have reference type"); 87 88 TR = t; 89 } 90 91 /// isValueDependent - Determines whether this expression is 92 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 93 /// array bound of "Chars" in the following example is 94 /// value-dependent. 95 /// @code 96 /// template<int Size, char (&Chars)[Size]> struct meta_string; 97 /// @endcode 98 bool isValueDependent() const { return ExprBits.ValueDependent; } 99 100 /// \brief Set whether this expression is value-dependent or not. 101 void setValueDependent(bool VD) { 102 ExprBits.ValueDependent = VD; 103 if (VD) 104 ExprBits.InstantiationDependent = true; 105 } 106 107 /// isTypeDependent - Determines whether this expression is 108 /// type-dependent (C++ [temp.dep.expr]), which means that its type 109 /// could change from one template instantiation to the next. For 110 /// example, the expressions "x" and "x + y" are type-dependent in 111 /// the following code, but "y" is not type-dependent: 112 /// @code 113 /// template<typename T> 114 /// void add(T x, int y) { 115 /// x + y; 116 /// } 117 /// @endcode 118 bool isTypeDependent() const { return ExprBits.TypeDependent; } 119 120 /// \brief Set whether this expression is type-dependent or not. 121 void setTypeDependent(bool TD) { 122 ExprBits.TypeDependent = TD; 123 if (TD) 124 ExprBits.InstantiationDependent = true; 125 } 126 127 /// \brief Whether this expression is instantiation-dependent, meaning that 128 /// it depends in some way on a template parameter, even if neither its type 129 /// nor (constant) value can change due to the template instantiation. 130 /// 131 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 132 /// instantiation-dependent (since it involves a template parameter \c T), but 133 /// is neither type- nor value-dependent, since the type of the inner 134 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 135 /// \c sizeof is known. 136 /// 137 /// \code 138 /// template<typename T> 139 /// void f(T x, T y) { 140 /// sizeof(sizeof(T() + T()); 141 /// } 142 /// \endcode 143 /// 144 bool isInstantiationDependent() const { 145 return ExprBits.InstantiationDependent; 146 } 147 148 /// \brief Set whether this expression is instantiation-dependent or not. 149 void setInstantiationDependent(bool ID) { 150 ExprBits.InstantiationDependent = ID; 151 } 152 153 /// \brief Whether this expression contains an unexpanded parameter 154 /// pack (for C++0x variadic templates). 155 /// 156 /// Given the following function template: 157 /// 158 /// \code 159 /// template<typename F, typename ...Types> 160 /// void forward(const F &f, Types &&...args) { 161 /// f(static_cast<Types&&>(args)...); 162 /// } 163 /// \endcode 164 /// 165 /// The expressions \c args and \c static_cast<Types&&>(args) both 166 /// contain parameter packs. 167 bool containsUnexpandedParameterPack() const { 168 return ExprBits.ContainsUnexpandedParameterPack; 169 } 170 171 /// \brief Set the bit that describes whether this expression 172 /// contains an unexpanded parameter pack. 173 void setContainsUnexpandedParameterPack(bool PP = true) { 174 ExprBits.ContainsUnexpandedParameterPack = PP; 175 } 176 177 /// getExprLoc - Return the preferred location for the arrow when diagnosing 178 /// a problem with a generic expression. 179 SourceLocation getExprLoc() const 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 expr, location, 183 /// and ranges with expr to warn on and source locations/ranges appropriate 184 /// for a warning. 185 bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc, 186 SourceRange &R1, SourceRange &R2, 187 ASTContext &Ctx) const; 188 189 /// isLValue - True if this expression is an "l-value" according to 190 /// the rules of the current language. C and C++ give somewhat 191 /// different rules for this concept, but in general, the result of 192 /// an l-value expression identifies a specific object whereas the 193 /// result of an r-value expression is a value detached from any 194 /// specific storage. 195 /// 196 /// C++0x divides the concept of "r-value" into pure r-values 197 /// ("pr-values") and so-called expiring values ("x-values"), which 198 /// identify specific objects that can be safely cannibalized for 199 /// their resources. This is an unfortunate abuse of terminology on 200 /// the part of the C++ committee. In Clang, when we say "r-value", 201 /// we generally mean a pr-value. 202 bool isLValue() const { return getValueKind() == VK_LValue; } 203 bool isRValue() const { return getValueKind() == VK_RValue; } 204 bool isXValue() const { return getValueKind() == VK_XValue; } 205 bool isGLValue() const { return getValueKind() != VK_RValue; } 206 207 enum LValueClassification { 208 LV_Valid, 209 LV_NotObjectType, 210 LV_IncompleteVoidType, 211 LV_DuplicateVectorComponents, 212 LV_InvalidExpression, 213 LV_InvalidMessageExpression, 214 LV_MemberFunction, 215 LV_SubObjCPropertySetting, 216 LV_ClassTemporary 217 }; 218 /// Reasons why an expression might not be an l-value. 219 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 220 221 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 222 /// does not have an incomplete type, does not have a const-qualified type, 223 /// and if it is a structure or union, does not have any member (including, 224 /// recursively, any member or element of all contained aggregates or unions) 225 /// with a const-qualified type. 226 /// 227 /// \param Loc [in] [out] - A source location which *may* be filled 228 /// in with the location of the expression making this a 229 /// non-modifiable lvalue, if specified. 230 enum isModifiableLvalueResult { 231 MLV_Valid, 232 MLV_NotObjectType, 233 MLV_IncompleteVoidType, 234 MLV_DuplicateVectorComponents, 235 MLV_InvalidExpression, 236 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 237 MLV_IncompleteType, 238 MLV_ConstQualified, 239 MLV_ArrayType, 240 MLV_ReadonlyProperty, 241 MLV_NoSetterProperty, 242 MLV_MemberFunction, 243 MLV_SubObjCPropertySetting, 244 MLV_InvalidMessageExpression, 245 MLV_ClassTemporary 246 }; 247 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 248 SourceLocation *Loc = 0) const; 249 250 /// \brief The return type of classify(). Represents the C++0x expression 251 /// taxonomy. 252 class Classification { 253 public: 254 /// \brief The various classification results. Most of these mean prvalue. 255 enum Kinds { 256 CL_LValue, 257 CL_XValue, 258 CL_Function, // Functions cannot be lvalues in C. 259 CL_Void, // Void cannot be an lvalue in C. 260 CL_AddressableVoid, // Void expression whose address can be taken in C. 261 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 262 CL_MemberFunction, // An expression referring to a member function 263 CL_SubObjCPropertySetting, 264 CL_ClassTemporary, // A prvalue of class type 265 CL_ObjCMessageRValue, // ObjC message is an rvalue 266 CL_PRValue // A prvalue for any other reason, of any other type 267 }; 268 /// \brief The results of modification testing. 269 enum ModifiableType { 270 CM_Untested, // testModifiable was false. 271 CM_Modifiable, 272 CM_RValue, // Not modifiable because it's an rvalue 273 CM_Function, // Not modifiable because it's a function; C++ only 274 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 275 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 276 CM_ConstQualified, 277 CM_ArrayType, 278 CM_IncompleteType 279 }; 280 281 private: 282 friend class Expr; 283 284 unsigned short Kind; 285 unsigned short Modifiable; 286 287 explicit Classification(Kinds k, ModifiableType m) 288 : Kind(k), Modifiable(m) 289 {} 290 291 public: 292 Classification() {} 293 294 Kinds getKind() const { return static_cast<Kinds>(Kind); } 295 ModifiableType getModifiable() const { 296 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 297 return static_cast<ModifiableType>(Modifiable); 298 } 299 bool isLValue() const { return Kind == CL_LValue; } 300 bool isXValue() const { return Kind == CL_XValue; } 301 bool isGLValue() const { return Kind <= CL_XValue; } 302 bool isPRValue() const { return Kind >= CL_Function; } 303 bool isRValue() const { return Kind >= CL_XValue; } 304 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 305 306 /// \brief Create a simple, modifiably lvalue 307 static Classification makeSimpleLValue() { 308 return Classification(CL_LValue, CM_Modifiable); 309 } 310 311 }; 312 /// \brief Classify - Classify this expression according to the C++0x 313 /// expression taxonomy. 314 /// 315 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 316 /// old lvalue vs rvalue. This function determines the type of expression this 317 /// is. There are three expression types: 318 /// - lvalues are classical lvalues as in C++03. 319 /// - prvalues are equivalent to rvalues in C++03. 320 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 321 /// function returning an rvalue reference. 322 /// lvalues and xvalues are collectively referred to as glvalues, while 323 /// prvalues and xvalues together form rvalues. 324 Classification Classify(ASTContext &Ctx) const { 325 return ClassifyImpl(Ctx, 0); 326 } 327 328 /// \brief ClassifyModifiable - Classify this expression according to the 329 /// C++0x expression taxonomy, and see if it is valid on the left side 330 /// of an assignment. 331 /// 332 /// This function extends classify in that it also tests whether the 333 /// expression is modifiable (C99 6.3.2.1p1). 334 /// \param Loc A source location that might be filled with a relevant location 335 /// if the expression is not modifiable. 336 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 337 return ClassifyImpl(Ctx, &Loc); 338 } 339 340 /// getValueKindForType - Given a formal return or parameter type, 341 /// give its value kind. 342 static ExprValueKind getValueKindForType(QualType T) { 343 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 344 return (isa<LValueReferenceType>(RT) 345 ? VK_LValue 346 : (RT->getPointeeType()->isFunctionType() 347 ? VK_LValue : VK_XValue)); 348 return VK_RValue; 349 } 350 351 /// getValueKind - The value kind that this expression produces. 352 ExprValueKind getValueKind() const { 353 return static_cast<ExprValueKind>(ExprBits.ValueKind); 354 } 355 356 /// getObjectKind - The object kind that this expression produces. 357 /// Object kinds are meaningful only for expressions that yield an 358 /// l-value or x-value. 359 ExprObjectKind getObjectKind() const { 360 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 361 } 362 363 bool isOrdinaryOrBitFieldObject() const { 364 ExprObjectKind OK = getObjectKind(); 365 return (OK == OK_Ordinary || OK == OK_BitField); 366 } 367 368 /// setValueKind - Set the value kind produced by this expression. 369 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 370 371 /// setObjectKind - Set the object kind produced by this expression. 372 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 373 374private: 375 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 376 377public: 378 379 /// \brief If this expression refers to a bit-field, retrieve the 380 /// declaration of that bit-field. 381 FieldDecl *getBitField(); 382 383 const FieldDecl *getBitField() const { 384 return const_cast<Expr*>(this)->getBitField(); 385 } 386 387 /// \brief If this expression is an l-value for an Objective C 388 /// property, find the underlying property reference expression. 389 const ObjCPropertyRefExpr *getObjCProperty() const; 390 391 /// \brief Returns whether this expression refers to a vector element. 392 bool refersToVectorElement() const; 393 394 /// \brief Returns whether this expression has a placeholder type. 395 bool hasPlaceholderType() const { 396 return getType()->isPlaceholderType(); 397 } 398 399 /// \brief Returns whether this expression has a specific placeholder type. 400 bool hasPlaceholderType(BuiltinType::Kind K) const { 401 assert(BuiltinType::isPlaceholderTypeKind(K)); 402 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 403 return BT->getKind() == K; 404 return false; 405 } 406 407 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 408 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 409 /// but also int expressions which are produced by things like comparisons in 410 /// C. 411 bool isKnownToHaveBooleanValue() const; 412 413 /// isIntegerConstantExpr - Return true if this expression is a valid integer 414 /// constant expression, and, if so, return its value in Result. If not a 415 /// valid i-c-e, return false and fill in Loc (if specified) with the location 416 /// of the invalid expression. 417 /// 418 /// Note: This does not perform the implicit conversions required by C++11 419 /// [expr.const]p5. 420 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 421 SourceLocation *Loc = 0, 422 bool isEvaluated = true) const; 423 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const; 424 425 /// isCXX98IntegralConstantExpr - Return true if this expression is an 426 /// integral constant expression in C++98. Can only be used in C++. 427 bool isCXX98IntegralConstantExpr(ASTContext &Ctx) const; 428 429 /// isCXX11ConstantExpr - Return true if this expression is a constant 430 /// expression in C++11. Can only be used in C++. 431 /// 432 /// Note: This does not perform the implicit conversions required by C++11 433 /// [expr.const]p5. 434 bool isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result = 0, 435 SourceLocation *Loc = 0) const; 436 437 /// isPotentialConstantExpr - Return true if this function's definition 438 /// might be usable in a constant expression in C++11, if it were marked 439 /// constexpr. Return false if the function can never produce a constant 440 /// expression, along with diagnostics describing why not. 441 static bool isPotentialConstantExpr(const FunctionDecl *FD, 442 llvm::SmallVectorImpl< 443 PartialDiagnosticAt> &Diags); 444 445 /// isConstantInitializer - Returns true if this expression can be emitted to 446 /// IR as a constant, and thus can be used as a constant initializer in C. 447 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 448 449 /// EvalStatus is a struct with detailed info about an evaluation in progress. 450 struct EvalStatus { 451 /// HasSideEffects - Whether the evaluated expression has side effects. 452 /// For example, (f() && 0) can be folded, but it still has side effects. 453 bool HasSideEffects; 454 455 /// Diag - If this is non-null, it will be filled in with a stack of notes 456 /// indicating why evaluation failed (or why it failed to produce a constant 457 /// expression). 458 /// If the expression is unfoldable, the notes will indicate why it's not 459 /// foldable. If the expression is foldable, but not a constant expression, 460 /// the notes will describes why it isn't a constant expression. If the 461 /// expression *is* a constant expression, no notes will be produced. 462 llvm::SmallVectorImpl<PartialDiagnosticAt> *Diag; 463 464 EvalStatus() : HasSideEffects(false), Diag(0) {} 465 466 // hasSideEffects - Return true if the evaluated expression has 467 // side effects. 468 bool hasSideEffects() const { 469 return HasSideEffects; 470 } 471 }; 472 473 /// EvalResult is a struct with detailed info about an evaluated expression. 474 struct EvalResult : EvalStatus { 475 /// Val - This is the value the expression can be folded to. 476 APValue Val; 477 478 // isGlobalLValue - Return true if the evaluated lvalue expression 479 // is global. 480 bool isGlobalLValue() const; 481 }; 482 483 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 484 /// an rvalue using any crazy technique (that has nothing to do with language 485 /// standards) that we want to, even if the expression has side-effects. If 486 /// this function returns true, it returns the folded constant in Result. If 487 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 488 /// applied. 489 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 490 491 /// EvaluateAsBooleanCondition - Return true if this is a constant 492 /// which we we can fold and convert to a boolean condition using 493 /// any crazy technique that we want to, even if the expression has 494 /// side-effects. 495 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 496 497 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects }; 498 499 /// EvaluateAsInt - Return true if this is a constant which we can fold and 500 /// convert to an integer, using any crazy technique that we want to. 501 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 502 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 503 504 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 505 /// constant folded without side-effects, but discard the result. 506 bool isEvaluatable(const ASTContext &Ctx) const; 507 508 /// HasSideEffects - This routine returns true for all those expressions 509 /// which must be evaluated each time and must not be optimized away 510 /// or evaluated at compile time. Example is a function call, volatile 511 /// variable read. 512 bool HasSideEffects(const ASTContext &Ctx) const; 513 514 /// \brief Determine whether this expression involves a call to any function 515 /// that is not trivial. 516 bool hasNonTrivialCall(ASTContext &Ctx); 517 518 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 519 /// integer. This must be called on an expression that constant folds to an 520 /// integer. 521 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 522 523 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 524 /// lvalue with link time known address, with no side-effects. 525 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 526 527 /// EvaluateAsInitializer - Evaluate an expression as if it were the 528 /// initializer of the given declaration. Returns true if the initializer 529 /// can be folded to a constant, and produces any relevant notes. In C++11, 530 /// notes will be produced if the expression is not a constant expression. 531 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 532 const VarDecl *VD, 533 llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 534 535 /// \brief Enumeration used to describe the kind of Null pointer constant 536 /// returned from \c isNullPointerConstant(). 537 enum NullPointerConstantKind { 538 /// \brief Expression is not a Null pointer constant. 539 NPCK_NotNull = 0, 540 541 /// \brief Expression is a Null pointer constant built from a zero integer. 542 NPCK_ZeroInteger, 543 544 /// \brief Expression is a C++0X nullptr. 545 NPCK_CXX0X_nullptr, 546 547 /// \brief Expression is a GNU-style __null constant. 548 NPCK_GNUNull 549 }; 550 551 /// \brief Enumeration used to describe how \c isNullPointerConstant() 552 /// should cope with value-dependent expressions. 553 enum NullPointerConstantValueDependence { 554 /// \brief Specifies that the expression should never be value-dependent. 555 NPC_NeverValueDependent = 0, 556 557 /// \brief Specifies that a value-dependent expression of integral or 558 /// dependent type should be considered a null pointer constant. 559 NPC_ValueDependentIsNull, 560 561 /// \brief Specifies that a value-dependent expression should be considered 562 /// to never be a null pointer constant. 563 NPC_ValueDependentIsNotNull 564 }; 565 566 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 567 /// a Null pointer constant. The return value can further distinguish the 568 /// kind of NULL pointer constant that was detected. 569 NullPointerConstantKind isNullPointerConstant( 570 ASTContext &Ctx, 571 NullPointerConstantValueDependence NPC) const; 572 573 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 574 /// write barrier. 575 bool isOBJCGCCandidate(ASTContext &Ctx) const; 576 577 /// \brief Returns true if this expression is a bound member function. 578 bool isBoundMemberFunction(ASTContext &Ctx) const; 579 580 /// \brief Given an expression of bound-member type, find the type 581 /// of the member. Returns null if this is an *overloaded* bound 582 /// member expression. 583 static QualType findBoundMemberType(const Expr *expr); 584 585 /// IgnoreImpCasts - Skip past any implicit casts which might 586 /// surround this expression. Only skips ImplicitCastExprs. 587 Expr *IgnoreImpCasts() LLVM_READONLY; 588 589 /// IgnoreImplicit - Skip past any implicit AST nodes which might 590 /// surround this expression. 591 Expr *IgnoreImplicit() LLVM_READONLY { 592 return cast<Expr>(Stmt::IgnoreImplicit()); 593 } 594 595 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 596 /// its subexpression. If that subexpression is also a ParenExpr, 597 /// then this method recursively returns its subexpression, and so forth. 598 /// Otherwise, the method returns the current Expr. 599 Expr *IgnoreParens() LLVM_READONLY; 600 601 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 602 /// or CastExprs, returning their operand. 603 Expr *IgnoreParenCasts() LLVM_READONLY; 604 605 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 606 /// any ParenExpr or ImplicitCastExprs, returning their operand. 607 Expr *IgnoreParenImpCasts() LLVM_READONLY; 608 609 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 610 /// call to a conversion operator, return the argument. 611 Expr *IgnoreConversionOperator() LLVM_READONLY; 612 613 const Expr *IgnoreConversionOperator() const LLVM_READONLY { 614 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 615 } 616 617 const Expr *IgnoreParenImpCasts() const LLVM_READONLY { 618 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 619 } 620 621 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 622 /// CastExprs that represent lvalue casts, returning their operand. 623 Expr *IgnoreParenLValueCasts() LLVM_READONLY; 624 625 const Expr *IgnoreParenLValueCasts() const LLVM_READONLY { 626 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 627 } 628 629 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 630 /// value (including ptr->int casts of the same size). Strip off any 631 /// ParenExpr or CastExprs, returning their operand. 632 Expr *IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY; 633 634 /// \brief Determine whether this expression is a default function argument. 635 /// 636 /// Default arguments are implicitly generated in the abstract syntax tree 637 /// by semantic analysis for function calls, object constructions, etc. in 638 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 639 /// this routine also looks through any implicit casts to determine whether 640 /// the expression is a default argument. 641 bool isDefaultArgument() const; 642 643 /// \brief Determine whether the result of this expression is a 644 /// temporary object of the given class type. 645 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 646 647 /// \brief Whether this expression is an implicit reference to 'this' in C++. 648 bool isImplicitCXXThis() const; 649 650 const Expr *IgnoreImpCasts() const LLVM_READONLY { 651 return const_cast<Expr*>(this)->IgnoreImpCasts(); 652 } 653 const Expr *IgnoreParens() const LLVM_READONLY { 654 return const_cast<Expr*>(this)->IgnoreParens(); 655 } 656 const Expr *IgnoreParenCasts() const LLVM_READONLY { 657 return const_cast<Expr*>(this)->IgnoreParenCasts(); 658 } 659 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const LLVM_READONLY { 660 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 661 } 662 663 static bool hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs); 664 665 static bool classof(const Stmt *T) { 666 return T->getStmtClass() >= firstExprConstant && 667 T->getStmtClass() <= lastExprConstant; 668 } 669 static bool classof(const Expr *) { return true; } 670}; 671 672 673//===----------------------------------------------------------------------===// 674// Primary Expressions. 675//===----------------------------------------------------------------------===// 676 677/// OpaqueValueExpr - An expression referring to an opaque object of a 678/// fixed type and value class. These don't correspond to concrete 679/// syntax; instead they're used to express operations (usually copy 680/// operations) on values whose source is generally obvious from 681/// context. 682class OpaqueValueExpr : public Expr { 683 friend class ASTStmtReader; 684 Expr *SourceExpr; 685 SourceLocation Loc; 686 687public: 688 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 689 ExprObjectKind OK = OK_Ordinary, 690 Expr *SourceExpr = 0) 691 : Expr(OpaqueValueExprClass, T, VK, OK, 692 T->isDependentType(), 693 T->isDependentType() || 694 (SourceExpr && SourceExpr->isValueDependent()), 695 T->isInstantiationDependentType(), 696 false), 697 SourceExpr(SourceExpr), Loc(Loc) { 698 } 699 700 /// Given an expression which invokes a copy constructor --- i.e. a 701 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 702 /// find the OpaqueValueExpr that's the source of the construction. 703 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 704 705 explicit OpaqueValueExpr(EmptyShell Empty) 706 : Expr(OpaqueValueExprClass, Empty) { } 707 708 /// \brief Retrieve the location of this expression. 709 SourceLocation getLocation() const { return Loc; } 710 711 SourceRange getSourceRange() const LLVM_READONLY { 712 if (SourceExpr) return SourceExpr->getSourceRange(); 713 return Loc; 714 } 715 SourceLocation getExprLoc() const LLVM_READONLY { 716 if (SourceExpr) return SourceExpr->getExprLoc(); 717 return Loc; 718 } 719 720 child_range children() { return child_range(); } 721 722 /// The source expression of an opaque value expression is the 723 /// expression which originally generated the value. This is 724 /// provided as a convenience for analyses that don't wish to 725 /// precisely model the execution behavior of the program. 726 /// 727 /// The source expression is typically set when building the 728 /// expression which binds the opaque value expression in the first 729 /// place. 730 Expr *getSourceExpr() const { return SourceExpr; } 731 732 static bool classof(const Stmt *T) { 733 return T->getStmtClass() == OpaqueValueExprClass; 734 } 735 static bool classof(const OpaqueValueExpr *) { return true; } 736}; 737 738/// \brief A reference to a declared variable, function, enum, etc. 739/// [C99 6.5.1p2] 740/// 741/// This encodes all the information about how a declaration is referenced 742/// within an expression. 743/// 744/// There are several optional constructs attached to DeclRefExprs only when 745/// they apply in order to conserve memory. These are laid out past the end of 746/// the object, and flags in the DeclRefExprBitfield track whether they exist: 747/// 748/// DeclRefExprBits.HasQualifier: 749/// Specifies when this declaration reference expression has a C++ 750/// nested-name-specifier. 751/// DeclRefExprBits.HasFoundDecl: 752/// Specifies when this declaration reference expression has a record of 753/// a NamedDecl (different from the referenced ValueDecl) which was found 754/// during name lookup and/or overload resolution. 755/// DeclRefExprBits.HasTemplateKWAndArgsInfo: 756/// Specifies when this declaration reference expression has an explicit 757/// C++ template keyword and/or template argument list. 758/// DeclRefExprBits.RefersToEnclosingLocal 759/// Specifies when this declaration reference expression (validly) 760/// refers to a local variable from a different function. 761class DeclRefExpr : public Expr { 762 /// \brief The declaration that we are referencing. 763 ValueDecl *D; 764 765 /// \brief The location of the declaration name itself. 766 SourceLocation Loc; 767 768 /// \brief Provides source/type location info for the declaration name 769 /// embedded in D. 770 DeclarationNameLoc DNLoc; 771 772 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 773 NestedNameSpecifierLoc &getInternalQualifierLoc() { 774 assert(hasQualifier()); 775 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 776 } 777 778 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 779 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 780 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 781 } 782 783 /// \brief Test whether there is a distinct FoundDecl attached to the end of 784 /// this DRE. 785 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 786 787 /// \brief Helper to retrieve the optional NamedDecl through which this 788 /// reference occured. 789 NamedDecl *&getInternalFoundDecl() { 790 assert(hasFoundDecl()); 791 if (hasQualifier()) 792 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 793 return *reinterpret_cast<NamedDecl **>(this + 1); 794 } 795 796 /// \brief Helper to retrieve the optional NamedDecl through which this 797 /// reference occured. 798 NamedDecl *getInternalFoundDecl() const { 799 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 800 } 801 802 DeclRefExpr(ASTContext &Ctx, 803 NestedNameSpecifierLoc QualifierLoc, 804 SourceLocation TemplateKWLoc, 805 ValueDecl *D, bool refersToEnclosingLocal, 806 const DeclarationNameInfo &NameInfo, 807 NamedDecl *FoundD, 808 const TemplateArgumentListInfo *TemplateArgs, 809 QualType T, ExprValueKind VK); 810 811 /// \brief Construct an empty declaration reference expression. 812 explicit DeclRefExpr(EmptyShell Empty) 813 : Expr(DeclRefExprClass, Empty) { } 814 815 /// \brief Computes the type- and value-dependence flags for this 816 /// declaration reference expression. 817 void computeDependence(ASTContext &C); 818 819public: 820 DeclRefExpr(ValueDecl *D, bool refersToEnclosingLocal, QualType T, 821 ExprValueKind VK, SourceLocation L, 822 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 823 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 824 D(D), Loc(L), DNLoc(LocInfo) { 825 DeclRefExprBits.HasQualifier = 0; 826 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 827 DeclRefExprBits.HasFoundDecl = 0; 828 DeclRefExprBits.HadMultipleCandidates = 0; 829 DeclRefExprBits.RefersToEnclosingLocal = refersToEnclosingLocal; 830 computeDependence(D->getASTContext()); 831 } 832 833 static DeclRefExpr *Create(ASTContext &Context, 834 NestedNameSpecifierLoc QualifierLoc, 835 SourceLocation TemplateKWLoc, 836 ValueDecl *D, 837 bool isEnclosingLocal, 838 SourceLocation NameLoc, 839 QualType T, ExprValueKind VK, 840 NamedDecl *FoundD = 0, 841 const TemplateArgumentListInfo *TemplateArgs = 0); 842 843 static DeclRefExpr *Create(ASTContext &Context, 844 NestedNameSpecifierLoc QualifierLoc, 845 SourceLocation TemplateKWLoc, 846 ValueDecl *D, 847 bool isEnclosingLocal, 848 const DeclarationNameInfo &NameInfo, 849 QualType T, ExprValueKind VK, 850 NamedDecl *FoundD = 0, 851 const TemplateArgumentListInfo *TemplateArgs = 0); 852 853 /// \brief Construct an empty declaration reference expression. 854 static DeclRefExpr *CreateEmpty(ASTContext &Context, 855 bool HasQualifier, 856 bool HasFoundDecl, 857 bool HasTemplateKWAndArgsInfo, 858 unsigned NumTemplateArgs); 859 860 ValueDecl *getDecl() { return D; } 861 const ValueDecl *getDecl() const { return D; } 862 void setDecl(ValueDecl *NewD) { D = NewD; } 863 864 DeclarationNameInfo getNameInfo() const { 865 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 866 } 867 868 SourceLocation getLocation() const { return Loc; } 869 void setLocation(SourceLocation L) { Loc = L; } 870 SourceRange getSourceRange() const LLVM_READONLY; 871 SourceLocation getLocStart() const LLVM_READONLY; 872 SourceLocation getLocEnd() const LLVM_READONLY; 873 874 /// \brief Determine whether this declaration reference was preceded by a 875 /// C++ nested-name-specifier, e.g., \c N::foo. 876 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 877 878 /// \brief If the name was qualified, retrieves the nested-name-specifier 879 /// that precedes the name. Otherwise, returns NULL. 880 NestedNameSpecifier *getQualifier() const { 881 if (!hasQualifier()) 882 return 0; 883 884 return getInternalQualifierLoc().getNestedNameSpecifier(); 885 } 886 887 /// \brief If the name was qualified, retrieves the nested-name-specifier 888 /// that precedes the name, with source-location information. 889 NestedNameSpecifierLoc getQualifierLoc() const { 890 if (!hasQualifier()) 891 return NestedNameSpecifierLoc(); 892 893 return getInternalQualifierLoc(); 894 } 895 896 /// \brief Get the NamedDecl through which this reference occured. 897 /// 898 /// This Decl may be different from the ValueDecl actually referred to in the 899 /// presence of using declarations, etc. It always returns non-NULL, and may 900 /// simple return the ValueDecl when appropriate. 901 NamedDecl *getFoundDecl() { 902 return hasFoundDecl() ? getInternalFoundDecl() : D; 903 } 904 905 /// \brief Get the NamedDecl through which this reference occurred. 906 /// See non-const variant. 907 const NamedDecl *getFoundDecl() const { 908 return hasFoundDecl() ? getInternalFoundDecl() : D; 909 } 910 911 bool hasTemplateKWAndArgsInfo() const { 912 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 913 } 914 915 /// \brief Return the optional template keyword and arguments info. 916 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 917 if (!hasTemplateKWAndArgsInfo()) 918 return 0; 919 920 if (hasFoundDecl()) 921 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 922 &getInternalFoundDecl() + 1); 923 924 if (hasQualifier()) 925 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 926 &getInternalQualifierLoc() + 1); 927 928 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 929 } 930 931 /// \brief Return the optional template keyword and arguments info. 932 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 933 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo(); 934 } 935 936 /// \brief Retrieve the location of the template keyword preceding 937 /// this name, if any. 938 SourceLocation getTemplateKeywordLoc() const { 939 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 940 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 941 } 942 943 /// \brief Retrieve the location of the left angle bracket starting the 944 /// explicit template argument list following the name, if any. 945 SourceLocation getLAngleLoc() const { 946 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 947 return getTemplateKWAndArgsInfo()->LAngleLoc; 948 } 949 950 /// \brief Retrieve the location of the right angle bracket ending the 951 /// explicit template argument list following the name, if any. 952 SourceLocation getRAngleLoc() const { 953 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 954 return getTemplateKWAndArgsInfo()->RAngleLoc; 955 } 956 957 /// \brief Determines whether the name in this declaration reference 958 /// was preceded by the template keyword. 959 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 960 961 /// \brief Determines whether this declaration reference was followed by an 962 /// explicit template argument list. 963 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 964 965 /// \brief Retrieve the explicit template argument list that followed the 966 /// member template name. 967 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 968 assert(hasExplicitTemplateArgs()); 969 return *getTemplateKWAndArgsInfo(); 970 } 971 972 /// \brief Retrieve the explicit template argument list that followed the 973 /// member template name. 974 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 975 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 976 } 977 978 /// \brief Retrieves the optional explicit template arguments. 979 /// This points to the same data as getExplicitTemplateArgs(), but 980 /// returns null if there are no explicit template arguments. 981 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 982 if (!hasExplicitTemplateArgs()) return 0; 983 return &getExplicitTemplateArgs(); 984 } 985 986 /// \brief Copies the template arguments (if present) into the given 987 /// structure. 988 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 989 if (hasExplicitTemplateArgs()) 990 getExplicitTemplateArgs().copyInto(List); 991 } 992 993 /// \brief Retrieve the template arguments provided as part of this 994 /// template-id. 995 const TemplateArgumentLoc *getTemplateArgs() const { 996 if (!hasExplicitTemplateArgs()) 997 return 0; 998 999 return getExplicitTemplateArgs().getTemplateArgs(); 1000 } 1001 1002 /// \brief Retrieve the number of template arguments provided as part of this 1003 /// template-id. 1004 unsigned getNumTemplateArgs() const { 1005 if (!hasExplicitTemplateArgs()) 1006 return 0; 1007 1008 return getExplicitTemplateArgs().NumTemplateArgs; 1009 } 1010 1011 /// \brief Returns true if this expression refers to a function that 1012 /// was resolved from an overloaded set having size greater than 1. 1013 bool hadMultipleCandidates() const { 1014 return DeclRefExprBits.HadMultipleCandidates; 1015 } 1016 /// \brief Sets the flag telling whether this expression refers to 1017 /// a function that was resolved from an overloaded set having size 1018 /// greater than 1. 1019 void setHadMultipleCandidates(bool V = true) { 1020 DeclRefExprBits.HadMultipleCandidates = V; 1021 } 1022 1023 /// Does this DeclRefExpr refer to a local declaration from an 1024 /// enclosing function scope? 1025 bool refersToEnclosingLocal() const { 1026 return DeclRefExprBits.RefersToEnclosingLocal; 1027 } 1028 1029 static bool classof(const Stmt *T) { 1030 return T->getStmtClass() == DeclRefExprClass; 1031 } 1032 static bool classof(const DeclRefExpr *) { return true; } 1033 1034 // Iterators 1035 child_range children() { return child_range(); } 1036 1037 friend class ASTStmtReader; 1038 friend class ASTStmtWriter; 1039}; 1040 1041/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 1042class PredefinedExpr : public Expr { 1043public: 1044 enum IdentType { 1045 Func, 1046 Function, 1047 PrettyFunction, 1048 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 1049 /// 'virtual' keyword is omitted for virtual member functions. 1050 PrettyFunctionNoVirtual 1051 }; 1052 1053private: 1054 SourceLocation Loc; 1055 IdentType Type; 1056public: 1057 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 1058 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 1059 type->isDependentType(), type->isDependentType(), 1060 type->isInstantiationDependentType(), 1061 /*ContainsUnexpandedParameterPack=*/false), 1062 Loc(l), Type(IT) {} 1063 1064 /// \brief Construct an empty predefined expression. 1065 explicit PredefinedExpr(EmptyShell Empty) 1066 : Expr(PredefinedExprClass, Empty) { } 1067 1068 IdentType getIdentType() const { return Type; } 1069 void setIdentType(IdentType IT) { Type = IT; } 1070 1071 SourceLocation getLocation() const { return Loc; } 1072 void setLocation(SourceLocation L) { Loc = L; } 1073 1074 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1075 1076 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1077 1078 static bool classof(const Stmt *T) { 1079 return T->getStmtClass() == PredefinedExprClass; 1080 } 1081 static bool classof(const PredefinedExpr *) { return true; } 1082 1083 // Iterators 1084 child_range children() { return child_range(); } 1085}; 1086 1087/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1088/// leaking memory. 1089/// 1090/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1091/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1092/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1093/// the APFloat/APInt values will never get freed. APNumericStorage uses 1094/// ASTContext's allocator for memory allocation. 1095class APNumericStorage { 1096 union { 1097 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1098 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1099 }; 1100 unsigned BitWidth; 1101 1102 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1103 1104 APNumericStorage(const APNumericStorage&); // do not implement 1105 APNumericStorage& operator=(const APNumericStorage&); // do not implement 1106 1107protected: 1108 APNumericStorage() : VAL(0), BitWidth(0) { } 1109 1110 llvm::APInt getIntValue() const { 1111 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1112 if (NumWords > 1) 1113 return llvm::APInt(BitWidth, NumWords, pVal); 1114 else 1115 return llvm::APInt(BitWidth, VAL); 1116 } 1117 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1118}; 1119 1120class APIntStorage : private APNumericStorage { 1121public: 1122 llvm::APInt getValue() const { return getIntValue(); } 1123 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1124}; 1125 1126class APFloatStorage : private APNumericStorage { 1127public: 1128 llvm::APFloat getValue(bool IsIEEE) const { 1129 return llvm::APFloat(getIntValue(), IsIEEE); 1130 } 1131 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1132 setIntValue(C, Val.bitcastToAPInt()); 1133 } 1134}; 1135 1136class IntegerLiteral : public Expr, public APIntStorage { 1137 SourceLocation Loc; 1138 1139 /// \brief Construct an empty integer literal. 1140 explicit IntegerLiteral(EmptyShell Empty) 1141 : Expr(IntegerLiteralClass, Empty) { } 1142 1143public: 1144 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1145 // or UnsignedLongLongTy 1146 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 1147 QualType type, SourceLocation l) 1148 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1149 false, false), 1150 Loc(l) { 1151 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 1152 assert(V.getBitWidth() == C.getIntWidth(type) && 1153 "Integer type is not the correct size for constant."); 1154 setValue(C, V); 1155 } 1156 1157 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1158 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1159 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1160 /// \param V - the value that the returned integer literal contains. 1161 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1162 QualType type, SourceLocation l); 1163 /// \brief Returns a new empty integer literal. 1164 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1165 1166 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1167 1168 /// \brief Retrieve the location of the literal. 1169 SourceLocation getLocation() const { return Loc; } 1170 1171 void setLocation(SourceLocation Location) { Loc = Location; } 1172 1173 static bool classof(const Stmt *T) { 1174 return T->getStmtClass() == IntegerLiteralClass; 1175 } 1176 static bool classof(const IntegerLiteral *) { return true; } 1177 1178 // Iterators 1179 child_range children() { return child_range(); } 1180}; 1181 1182class CharacterLiteral : public Expr { 1183public: 1184 enum CharacterKind { 1185 Ascii, 1186 Wide, 1187 UTF16, 1188 UTF32 1189 }; 1190 1191private: 1192 unsigned Value; 1193 SourceLocation Loc; 1194public: 1195 // type should be IntTy 1196 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1197 SourceLocation l) 1198 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1199 false, false), 1200 Value(value), Loc(l) { 1201 CharacterLiteralBits.Kind = kind; 1202 } 1203 1204 /// \brief Construct an empty character literal. 1205 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1206 1207 SourceLocation getLocation() const { return Loc; } 1208 CharacterKind getKind() const { 1209 return static_cast<CharacterKind>(CharacterLiteralBits.Kind); 1210 } 1211 1212 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1213 1214 unsigned getValue() const { return Value; } 1215 1216 void setLocation(SourceLocation Location) { Loc = Location; } 1217 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; } 1218 void setValue(unsigned Val) { Value = Val; } 1219 1220 static bool classof(const Stmt *T) { 1221 return T->getStmtClass() == CharacterLiteralClass; 1222 } 1223 static bool classof(const CharacterLiteral *) { return true; } 1224 1225 // Iterators 1226 child_range children() { return child_range(); } 1227}; 1228 1229class FloatingLiteral : public Expr, private APFloatStorage { 1230 SourceLocation Loc; 1231 1232 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1233 QualType Type, SourceLocation L) 1234 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1235 false, false), Loc(L) { 1236 FloatingLiteralBits.IsIEEE = 1237 &C.getTargetInfo().getLongDoubleFormat() == &llvm::APFloat::IEEEquad; 1238 FloatingLiteralBits.IsExact = isexact; 1239 setValue(C, V); 1240 } 1241 1242 /// \brief Construct an empty floating-point literal. 1243 explicit FloatingLiteral(ASTContext &C, EmptyShell Empty) 1244 : Expr(FloatingLiteralClass, Empty) { 1245 FloatingLiteralBits.IsIEEE = 1246 &C.getTargetInfo().getLongDoubleFormat() == &llvm::APFloat::IEEEquad; 1247 FloatingLiteralBits.IsExact = false; 1248 } 1249 1250public: 1251 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1252 bool isexact, QualType Type, SourceLocation L); 1253 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1254 1255 llvm::APFloat getValue() const { 1256 return APFloatStorage::getValue(FloatingLiteralBits.IsIEEE); 1257 } 1258 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1259 APFloatStorage::setValue(C, Val); 1260 } 1261 1262 bool isExact() const { return FloatingLiteralBits.IsExact; } 1263 void setExact(bool E) { FloatingLiteralBits.IsExact = E; } 1264 1265 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1266 /// double. Note that this may cause loss of precision, but is useful for 1267 /// debugging dumps, etc. 1268 double getValueAsApproximateDouble() const; 1269 1270 SourceLocation getLocation() const { return Loc; } 1271 void setLocation(SourceLocation L) { Loc = L; } 1272 1273 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1274 1275 static bool classof(const Stmt *T) { 1276 return T->getStmtClass() == FloatingLiteralClass; 1277 } 1278 static bool classof(const FloatingLiteral *) { return true; } 1279 1280 // Iterators 1281 child_range children() { return child_range(); } 1282}; 1283 1284/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1285/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1286/// IntegerLiteral classes. Instances of this class always have a Complex type 1287/// whose element type matches the subexpression. 1288/// 1289class ImaginaryLiteral : public Expr { 1290 Stmt *Val; 1291public: 1292 ImaginaryLiteral(Expr *val, QualType Ty) 1293 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1294 false, false), 1295 Val(val) {} 1296 1297 /// \brief Build an empty imaginary literal. 1298 explicit ImaginaryLiteral(EmptyShell Empty) 1299 : Expr(ImaginaryLiteralClass, Empty) { } 1300 1301 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1302 Expr *getSubExpr() { return cast<Expr>(Val); } 1303 void setSubExpr(Expr *E) { Val = E; } 1304 1305 SourceRange getSourceRange() const LLVM_READONLY { return Val->getSourceRange(); } 1306 static bool classof(const Stmt *T) { 1307 return T->getStmtClass() == ImaginaryLiteralClass; 1308 } 1309 static bool classof(const ImaginaryLiteral *) { return true; } 1310 1311 // Iterators 1312 child_range children() { return child_range(&Val, &Val+1); } 1313}; 1314 1315/// StringLiteral - This represents a string literal expression, e.g. "foo" 1316/// or L"bar" (wide strings). The actual string is returned by getStrData() 1317/// is NOT null-terminated, and the length of the string is determined by 1318/// calling getByteLength(). The C type for a string is always a 1319/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1320/// not. 1321/// 1322/// Note that strings in C can be formed by concatenation of multiple string 1323/// literal pptokens in translation phase #6. This keeps track of the locations 1324/// of each of these pieces. 1325/// 1326/// Strings in C can also be truncated and extended by assigning into arrays, 1327/// e.g. with constructs like: 1328/// char X[2] = "foobar"; 1329/// In this case, getByteLength() will return 6, but the string literal will 1330/// have type "char[2]". 1331class StringLiteral : public Expr { 1332public: 1333 enum StringKind { 1334 Ascii, 1335 Wide, 1336 UTF8, 1337 UTF16, 1338 UTF32 1339 }; 1340 1341private: 1342 friend class ASTStmtReader; 1343 1344 union { 1345 const char *asChar; 1346 const uint16_t *asUInt16; 1347 const uint32_t *asUInt32; 1348 } StrData; 1349 unsigned Length; 1350 unsigned CharByteWidth : 4; 1351 unsigned Kind : 3; 1352 unsigned IsPascal : 1; 1353 unsigned NumConcatenated; 1354 SourceLocation TokLocs[1]; 1355 1356 StringLiteral(QualType Ty) : 1357 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1358 false) {} 1359 1360 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1361 1362public: 1363 /// This is the "fully general" constructor that allows representation of 1364 /// strings formed from multiple concatenated tokens. 1365 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1366 bool Pascal, QualType Ty, 1367 const SourceLocation *Loc, unsigned NumStrs); 1368 1369 /// Simple constructor for string literals made from one token. 1370 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1371 bool Pascal, QualType Ty, 1372 SourceLocation Loc) { 1373 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1374 } 1375 1376 /// \brief Construct an empty string literal. 1377 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1378 1379 StringRef getString() const { 1380 assert(CharByteWidth==1 1381 && "This function is used in places that assume strings use char"); 1382 return StringRef(StrData.asChar, getByteLength()); 1383 } 1384 1385 /// Allow clients that need the byte representation, such as ASTWriterStmt 1386 /// ::VisitStringLiteral(), access. 1387 StringRef getBytes() const { 1388 // FIXME: StringRef may not be the right type to use as a result for this. 1389 if (CharByteWidth == 1) 1390 return StringRef(StrData.asChar, getByteLength()); 1391 if (CharByteWidth == 4) 1392 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1393 getByteLength()); 1394 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1395 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1396 getByteLength()); 1397 } 1398 1399 uint32_t getCodeUnit(size_t i) const { 1400 assert(i < Length && "out of bounds access"); 1401 if (CharByteWidth == 1) 1402 return static_cast<unsigned char>(StrData.asChar[i]); 1403 if (CharByteWidth == 4) 1404 return StrData.asUInt32[i]; 1405 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1406 return StrData.asUInt16[i]; 1407 } 1408 1409 unsigned getByteLength() const { return CharByteWidth*Length; } 1410 unsigned getLength() const { return Length; } 1411 unsigned getCharByteWidth() const { return CharByteWidth; } 1412 1413 /// \brief Sets the string data to the given string data. 1414 void setString(ASTContext &C, StringRef Str, 1415 StringKind Kind, bool IsPascal); 1416 1417 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1418 1419 1420 bool isAscii() const { return Kind == Ascii; } 1421 bool isWide() const { return Kind == Wide; } 1422 bool isUTF8() const { return Kind == UTF8; } 1423 bool isUTF16() const { return Kind == UTF16; } 1424 bool isUTF32() const { return Kind == UTF32; } 1425 bool isPascal() const { return IsPascal; } 1426 1427 bool containsNonAsciiOrNull() const { 1428 StringRef Str = getString(); 1429 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1430 if (!isascii(Str[i]) || !Str[i]) 1431 return true; 1432 return false; 1433 } 1434 1435 /// getNumConcatenated - Get the number of string literal tokens that were 1436 /// concatenated in translation phase #6 to form this string literal. 1437 unsigned getNumConcatenated() const { return NumConcatenated; } 1438 1439 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1440 assert(TokNum < NumConcatenated && "Invalid tok number"); 1441 return TokLocs[TokNum]; 1442 } 1443 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1444 assert(TokNum < NumConcatenated && "Invalid tok number"); 1445 TokLocs[TokNum] = L; 1446 } 1447 1448 /// getLocationOfByte - Return a source location that points to the specified 1449 /// byte of this string literal. 1450 /// 1451 /// Strings are amazingly complex. They can be formed from multiple tokens 1452 /// and can have escape sequences in them in addition to the usual trigraph 1453 /// and escaped newline business. This routine handles this complexity. 1454 /// 1455 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1456 const LangOptions &Features, 1457 const TargetInfo &Target) const; 1458 1459 typedef const SourceLocation *tokloc_iterator; 1460 tokloc_iterator tokloc_begin() const { return TokLocs; } 1461 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1462 1463 SourceRange getSourceRange() const LLVM_READONLY { 1464 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1465 } 1466 static bool classof(const Stmt *T) { 1467 return T->getStmtClass() == StringLiteralClass; 1468 } 1469 static bool classof(const StringLiteral *) { return true; } 1470 1471 // Iterators 1472 child_range children() { return child_range(); } 1473}; 1474 1475/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1476/// AST node is only formed if full location information is requested. 1477class ParenExpr : public Expr { 1478 SourceLocation L, R; 1479 Stmt *Val; 1480public: 1481 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1482 : Expr(ParenExprClass, val->getType(), 1483 val->getValueKind(), val->getObjectKind(), 1484 val->isTypeDependent(), val->isValueDependent(), 1485 val->isInstantiationDependent(), 1486 val->containsUnexpandedParameterPack()), 1487 L(l), R(r), Val(val) {} 1488 1489 /// \brief Construct an empty parenthesized expression. 1490 explicit ParenExpr(EmptyShell Empty) 1491 : Expr(ParenExprClass, Empty) { } 1492 1493 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1494 Expr *getSubExpr() { return cast<Expr>(Val); } 1495 void setSubExpr(Expr *E) { Val = E; } 1496 1497 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(L, R); } 1498 1499 /// \brief Get the location of the left parentheses '('. 1500 SourceLocation getLParen() const { return L; } 1501 void setLParen(SourceLocation Loc) { L = Loc; } 1502 1503 /// \brief Get the location of the right parentheses ')'. 1504 SourceLocation getRParen() const { return R; } 1505 void setRParen(SourceLocation Loc) { R = Loc; } 1506 1507 static bool classof(const Stmt *T) { 1508 return T->getStmtClass() == ParenExprClass; 1509 } 1510 static bool classof(const ParenExpr *) { return true; } 1511 1512 // Iterators 1513 child_range children() { return child_range(&Val, &Val+1); } 1514}; 1515 1516 1517/// UnaryOperator - This represents the unary-expression's (except sizeof and 1518/// alignof), the postinc/postdec operators from postfix-expression, and various 1519/// extensions. 1520/// 1521/// Notes on various nodes: 1522/// 1523/// Real/Imag - These return the real/imag part of a complex operand. If 1524/// applied to a non-complex value, the former returns its operand and the 1525/// later returns zero in the type of the operand. 1526/// 1527class UnaryOperator : public Expr { 1528public: 1529 typedef UnaryOperatorKind Opcode; 1530 1531private: 1532 unsigned Opc : 5; 1533 SourceLocation Loc; 1534 Stmt *Val; 1535public: 1536 1537 UnaryOperator(Expr *input, Opcode opc, QualType type, 1538 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1539 : Expr(UnaryOperatorClass, type, VK, OK, 1540 input->isTypeDependent() || type->isDependentType(), 1541 input->isValueDependent(), 1542 (input->isInstantiationDependent() || 1543 type->isInstantiationDependentType()), 1544 input->containsUnexpandedParameterPack()), 1545 Opc(opc), Loc(l), Val(input) {} 1546 1547 /// \brief Build an empty unary operator. 1548 explicit UnaryOperator(EmptyShell Empty) 1549 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1550 1551 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1552 void setOpcode(Opcode O) { Opc = O; } 1553 1554 Expr *getSubExpr() const { return cast<Expr>(Val); } 1555 void setSubExpr(Expr *E) { Val = E; } 1556 1557 /// getOperatorLoc - Return the location of the operator. 1558 SourceLocation getOperatorLoc() const { return Loc; } 1559 void setOperatorLoc(SourceLocation L) { Loc = L; } 1560 1561 /// isPostfix - Return true if this is a postfix operation, like x++. 1562 static bool isPostfix(Opcode Op) { 1563 return Op == UO_PostInc || Op == UO_PostDec; 1564 } 1565 1566 /// isPrefix - Return true if this is a prefix operation, like --x. 1567 static bool isPrefix(Opcode Op) { 1568 return Op == UO_PreInc || Op == UO_PreDec; 1569 } 1570 1571 bool isPrefix() const { return isPrefix(getOpcode()); } 1572 bool isPostfix() const { return isPostfix(getOpcode()); } 1573 1574 static bool isIncrementOp(Opcode Op) { 1575 return Op == UO_PreInc || Op == UO_PostInc; 1576 } 1577 bool isIncrementOp() const { 1578 return isIncrementOp(getOpcode()); 1579 } 1580 1581 static bool isDecrementOp(Opcode Op) { 1582 return Op == UO_PreDec || Op == UO_PostDec; 1583 } 1584 bool isDecrementOp() const { 1585 return isDecrementOp(getOpcode()); 1586 } 1587 1588 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1589 bool isIncrementDecrementOp() const { 1590 return isIncrementDecrementOp(getOpcode()); 1591 } 1592 1593 static bool isArithmeticOp(Opcode Op) { 1594 return Op >= UO_Plus && Op <= UO_LNot; 1595 } 1596 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1597 1598 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1599 /// corresponds to, e.g. "sizeof" or "[pre]++" 1600 static const char *getOpcodeStr(Opcode Op); 1601 1602 /// \brief Retrieve the unary opcode that corresponds to the given 1603 /// overloaded operator. 1604 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1605 1606 /// \brief Retrieve the overloaded operator kind that corresponds to 1607 /// the given unary opcode. 1608 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1609 1610 SourceRange getSourceRange() const LLVM_READONLY { 1611 if (isPostfix()) 1612 return SourceRange(Val->getLocStart(), Loc); 1613 else 1614 return SourceRange(Loc, Val->getLocEnd()); 1615 } 1616 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; } 1617 1618 static bool classof(const Stmt *T) { 1619 return T->getStmtClass() == UnaryOperatorClass; 1620 } 1621 static bool classof(const UnaryOperator *) { return true; } 1622 1623 // Iterators 1624 child_range children() { return child_range(&Val, &Val+1); } 1625}; 1626 1627/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1628/// offsetof(record-type, member-designator). For example, given: 1629/// @code 1630/// struct S { 1631/// float f; 1632/// double d; 1633/// }; 1634/// struct T { 1635/// int i; 1636/// struct S s[10]; 1637/// }; 1638/// @endcode 1639/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1640 1641class OffsetOfExpr : public Expr { 1642public: 1643 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1644 class OffsetOfNode { 1645 public: 1646 /// \brief The kind of offsetof node we have. 1647 enum Kind { 1648 /// \brief An index into an array. 1649 Array = 0x00, 1650 /// \brief A field. 1651 Field = 0x01, 1652 /// \brief A field in a dependent type, known only by its name. 1653 Identifier = 0x02, 1654 /// \brief An implicit indirection through a C++ base class, when the 1655 /// field found is in a base class. 1656 Base = 0x03 1657 }; 1658 1659 private: 1660 enum { MaskBits = 2, Mask = 0x03 }; 1661 1662 /// \brief The source range that covers this part of the designator. 1663 SourceRange Range; 1664 1665 /// \brief The data describing the designator, which comes in three 1666 /// different forms, depending on the lower two bits. 1667 /// - An unsigned index into the array of Expr*'s stored after this node 1668 /// in memory, for [constant-expression] designators. 1669 /// - A FieldDecl*, for references to a known field. 1670 /// - An IdentifierInfo*, for references to a field with a given name 1671 /// when the class type is dependent. 1672 /// - A CXXBaseSpecifier*, for references that look at a field in a 1673 /// base class. 1674 uintptr_t Data; 1675 1676 public: 1677 /// \brief Create an offsetof node that refers to an array element. 1678 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1679 SourceLocation RBracketLoc) 1680 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1681 1682 /// \brief Create an offsetof node that refers to a field. 1683 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1684 SourceLocation NameLoc) 1685 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1686 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1687 1688 /// \brief Create an offsetof node that refers to an identifier. 1689 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1690 SourceLocation NameLoc) 1691 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1692 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1693 1694 /// \brief Create an offsetof node that refers into a C++ base class. 1695 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1696 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1697 1698 /// \brief Determine what kind of offsetof node this is. 1699 Kind getKind() const { 1700 return static_cast<Kind>(Data & Mask); 1701 } 1702 1703 /// \brief For an array element node, returns the index into the array 1704 /// of expressions. 1705 unsigned getArrayExprIndex() const { 1706 assert(getKind() == Array); 1707 return Data >> 2; 1708 } 1709 1710 /// \brief For a field offsetof node, returns the field. 1711 FieldDecl *getField() const { 1712 assert(getKind() == Field); 1713 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1714 } 1715 1716 /// \brief For a field or identifier offsetof node, returns the name of 1717 /// the field. 1718 IdentifierInfo *getFieldName() const; 1719 1720 /// \brief For a base class node, returns the base specifier. 1721 CXXBaseSpecifier *getBase() const { 1722 assert(getKind() == Base); 1723 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1724 } 1725 1726 /// \brief Retrieve the source range that covers this offsetof node. 1727 /// 1728 /// For an array element node, the source range contains the locations of 1729 /// the square brackets. For a field or identifier node, the source range 1730 /// contains the location of the period (if there is one) and the 1731 /// identifier. 1732 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 1733 }; 1734 1735private: 1736 1737 SourceLocation OperatorLoc, RParenLoc; 1738 // Base type; 1739 TypeSourceInfo *TSInfo; 1740 // Number of sub-components (i.e. instances of OffsetOfNode). 1741 unsigned NumComps; 1742 // Number of sub-expressions (i.e. array subscript expressions). 1743 unsigned NumExprs; 1744 1745 OffsetOfExpr(ASTContext &C, QualType type, 1746 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1747 OffsetOfNode* compsPtr, unsigned numComps, 1748 Expr** exprsPtr, unsigned numExprs, 1749 SourceLocation RParenLoc); 1750 1751 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1752 : Expr(OffsetOfExprClass, EmptyShell()), 1753 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1754 1755public: 1756 1757 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1758 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1759 OffsetOfNode* compsPtr, unsigned numComps, 1760 Expr** exprsPtr, unsigned numExprs, 1761 SourceLocation RParenLoc); 1762 1763 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1764 unsigned NumComps, unsigned NumExprs); 1765 1766 /// getOperatorLoc - Return the location of the operator. 1767 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1768 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1769 1770 /// \brief Return the location of the right parentheses. 1771 SourceLocation getRParenLoc() const { return RParenLoc; } 1772 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1773 1774 TypeSourceInfo *getTypeSourceInfo() const { 1775 return TSInfo; 1776 } 1777 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1778 TSInfo = tsi; 1779 } 1780 1781 const OffsetOfNode &getComponent(unsigned Idx) const { 1782 assert(Idx < NumComps && "Subscript out of range"); 1783 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1784 } 1785 1786 void setComponent(unsigned Idx, OffsetOfNode ON) { 1787 assert(Idx < NumComps && "Subscript out of range"); 1788 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1789 } 1790 1791 unsigned getNumComponents() const { 1792 return NumComps; 1793 } 1794 1795 Expr* getIndexExpr(unsigned Idx) { 1796 assert(Idx < NumExprs && "Subscript out of range"); 1797 return reinterpret_cast<Expr **>( 1798 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1799 } 1800 const Expr *getIndexExpr(unsigned Idx) const { 1801 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1802 } 1803 1804 void setIndexExpr(unsigned Idx, Expr* E) { 1805 assert(Idx < NumComps && "Subscript out of range"); 1806 reinterpret_cast<Expr **>( 1807 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1808 } 1809 1810 unsigned getNumExpressions() const { 1811 return NumExprs; 1812 } 1813 1814 SourceRange getSourceRange() const LLVM_READONLY { 1815 return SourceRange(OperatorLoc, RParenLoc); 1816 } 1817 1818 static bool classof(const Stmt *T) { 1819 return T->getStmtClass() == OffsetOfExprClass; 1820 } 1821 1822 static bool classof(const OffsetOfExpr *) { return true; } 1823 1824 // Iterators 1825 child_range children() { 1826 Stmt **begin = 1827 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1828 + NumComps); 1829 return child_range(begin, begin + NumExprs); 1830 } 1831}; 1832 1833/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1834/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1835/// vec_step (OpenCL 1.1 6.11.12). 1836class UnaryExprOrTypeTraitExpr : public Expr { 1837 union { 1838 TypeSourceInfo *Ty; 1839 Stmt *Ex; 1840 } Argument; 1841 SourceLocation OpLoc, RParenLoc; 1842 1843public: 1844 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1845 QualType resultType, SourceLocation op, 1846 SourceLocation rp) : 1847 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1848 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1849 // Value-dependent if the argument is type-dependent. 1850 TInfo->getType()->isDependentType(), 1851 TInfo->getType()->isInstantiationDependentType(), 1852 TInfo->getType()->containsUnexpandedParameterPack()), 1853 OpLoc(op), RParenLoc(rp) { 1854 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1855 UnaryExprOrTypeTraitExprBits.IsType = true; 1856 Argument.Ty = TInfo; 1857 } 1858 1859 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1860 QualType resultType, SourceLocation op, 1861 SourceLocation rp) : 1862 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1863 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1864 // Value-dependent if the argument is type-dependent. 1865 E->isTypeDependent(), 1866 E->isInstantiationDependent(), 1867 E->containsUnexpandedParameterPack()), 1868 OpLoc(op), RParenLoc(rp) { 1869 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1870 UnaryExprOrTypeTraitExprBits.IsType = false; 1871 Argument.Ex = E; 1872 } 1873 1874 /// \brief Construct an empty sizeof/alignof expression. 1875 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1876 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1877 1878 UnaryExprOrTypeTrait getKind() const { 1879 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind); 1880 } 1881 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;} 1882 1883 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; } 1884 QualType getArgumentType() const { 1885 return getArgumentTypeInfo()->getType(); 1886 } 1887 TypeSourceInfo *getArgumentTypeInfo() const { 1888 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1889 return Argument.Ty; 1890 } 1891 Expr *getArgumentExpr() { 1892 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1893 return static_cast<Expr*>(Argument.Ex); 1894 } 1895 const Expr *getArgumentExpr() const { 1896 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1897 } 1898 1899 void setArgument(Expr *E) { 1900 Argument.Ex = E; 1901 UnaryExprOrTypeTraitExprBits.IsType = false; 1902 } 1903 void setArgument(TypeSourceInfo *TInfo) { 1904 Argument.Ty = TInfo; 1905 UnaryExprOrTypeTraitExprBits.IsType = true; 1906 } 1907 1908 /// Gets the argument type, or the type of the argument expression, whichever 1909 /// is appropriate. 1910 QualType getTypeOfArgument() const { 1911 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1912 } 1913 1914 SourceLocation getOperatorLoc() const { return OpLoc; } 1915 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1916 1917 SourceLocation getRParenLoc() const { return RParenLoc; } 1918 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1919 1920 SourceRange getSourceRange() const LLVM_READONLY { 1921 return SourceRange(OpLoc, RParenLoc); 1922 } 1923 1924 static bool classof(const Stmt *T) { 1925 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1926 } 1927 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1928 1929 // Iterators 1930 child_range children(); 1931}; 1932 1933//===----------------------------------------------------------------------===// 1934// Postfix Operators. 1935//===----------------------------------------------------------------------===// 1936 1937/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1938class ArraySubscriptExpr : public Expr { 1939 enum { LHS, RHS, END_EXPR=2 }; 1940 Stmt* SubExprs[END_EXPR]; 1941 SourceLocation RBracketLoc; 1942public: 1943 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1944 ExprValueKind VK, ExprObjectKind OK, 1945 SourceLocation rbracketloc) 1946 : Expr(ArraySubscriptExprClass, t, VK, OK, 1947 lhs->isTypeDependent() || rhs->isTypeDependent(), 1948 lhs->isValueDependent() || rhs->isValueDependent(), 1949 (lhs->isInstantiationDependent() || 1950 rhs->isInstantiationDependent()), 1951 (lhs->containsUnexpandedParameterPack() || 1952 rhs->containsUnexpandedParameterPack())), 1953 RBracketLoc(rbracketloc) { 1954 SubExprs[LHS] = lhs; 1955 SubExprs[RHS] = rhs; 1956 } 1957 1958 /// \brief Create an empty array subscript expression. 1959 explicit ArraySubscriptExpr(EmptyShell Shell) 1960 : Expr(ArraySubscriptExprClass, Shell) { } 1961 1962 /// An array access can be written A[4] or 4[A] (both are equivalent). 1963 /// - getBase() and getIdx() always present the normalized view: A[4]. 1964 /// In this case getBase() returns "A" and getIdx() returns "4". 1965 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1966 /// 4[A] getLHS() returns "4". 1967 /// Note: Because vector element access is also written A[4] we must 1968 /// predicate the format conversion in getBase and getIdx only on the 1969 /// the type of the RHS, as it is possible for the LHS to be a vector of 1970 /// integer type 1971 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1972 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1973 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1974 1975 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1976 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1977 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1978 1979 Expr *getBase() { 1980 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1981 } 1982 1983 const Expr *getBase() const { 1984 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1985 } 1986 1987 Expr *getIdx() { 1988 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1989 } 1990 1991 const Expr *getIdx() const { 1992 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1993 } 1994 1995 SourceRange getSourceRange() const LLVM_READONLY { 1996 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1997 } 1998 1999 SourceLocation getRBracketLoc() const { return RBracketLoc; } 2000 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 2001 2002 SourceLocation getExprLoc() const LLVM_READONLY { return getBase()->getExprLoc(); } 2003 2004 static bool classof(const Stmt *T) { 2005 return T->getStmtClass() == ArraySubscriptExprClass; 2006 } 2007 static bool classof(const ArraySubscriptExpr *) { return true; } 2008 2009 // Iterators 2010 child_range children() { 2011 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2012 } 2013}; 2014 2015 2016/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 2017/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 2018/// while its subclasses may represent alternative syntax that (semantically) 2019/// results in a function call. For example, CXXOperatorCallExpr is 2020/// a subclass for overloaded operator calls that use operator syntax, e.g., 2021/// "str1 + str2" to resolve to a function call. 2022class CallExpr : public Expr { 2023 enum { FN=0, PREARGS_START=1 }; 2024 Stmt **SubExprs; 2025 unsigned NumArgs; 2026 SourceLocation RParenLoc; 2027 2028protected: 2029 // These versions of the constructor are for derived classes. 2030 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 2031 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 2032 SourceLocation rparenloc); 2033 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 2034 2035 Stmt *getPreArg(unsigned i) { 2036 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2037 return SubExprs[PREARGS_START+i]; 2038 } 2039 const Stmt *getPreArg(unsigned i) const { 2040 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2041 return SubExprs[PREARGS_START+i]; 2042 } 2043 void setPreArg(unsigned i, Stmt *PreArg) { 2044 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2045 SubExprs[PREARGS_START+i] = PreArg; 2046 } 2047 2048 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2049 2050public: 2051 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 2052 ExprValueKind VK, SourceLocation rparenloc); 2053 2054 /// \brief Build an empty call expression. 2055 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 2056 2057 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2058 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2059 void setCallee(Expr *F) { SubExprs[FN] = F; } 2060 2061 Decl *getCalleeDecl(); 2062 const Decl *getCalleeDecl() const { 2063 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2064 } 2065 2066 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2067 FunctionDecl *getDirectCallee(); 2068 const FunctionDecl *getDirectCallee() const { 2069 return const_cast<CallExpr*>(this)->getDirectCallee(); 2070 } 2071 2072 /// getNumArgs - Return the number of actual arguments to this call. 2073 /// 2074 unsigned getNumArgs() const { return NumArgs; } 2075 2076 /// \brief Retrieve the call arguments. 2077 Expr **getArgs() { 2078 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2079 } 2080 const Expr *const *getArgs() const { 2081 return const_cast<CallExpr*>(this)->getArgs(); 2082 } 2083 2084 /// getArg - Return the specified argument. 2085 Expr *getArg(unsigned Arg) { 2086 assert(Arg < NumArgs && "Arg access out of range!"); 2087 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2088 } 2089 const Expr *getArg(unsigned Arg) const { 2090 assert(Arg < NumArgs && "Arg access out of range!"); 2091 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2092 } 2093 2094 /// setArg - Set the specified argument. 2095 void setArg(unsigned Arg, Expr *ArgExpr) { 2096 assert(Arg < NumArgs && "Arg access out of range!"); 2097 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2098 } 2099 2100 /// setNumArgs - This changes the number of arguments present in this call. 2101 /// Any orphaned expressions are deleted by this, and any new operands are set 2102 /// to null. 2103 void setNumArgs(ASTContext& C, unsigned NumArgs); 2104 2105 typedef ExprIterator arg_iterator; 2106 typedef ConstExprIterator const_arg_iterator; 2107 2108 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2109 arg_iterator arg_end() { 2110 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2111 } 2112 const_arg_iterator arg_begin() const { 2113 return SubExprs+PREARGS_START+getNumPreArgs(); 2114 } 2115 const_arg_iterator arg_end() const { 2116 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2117 } 2118 2119 /// getNumCommas - Return the number of commas that must have been present in 2120 /// this function call. 2121 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2122 2123 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2124 /// not, return 0. 2125 unsigned isBuiltinCall() const; 2126 2127 /// getCallReturnType - Get the return type of the call expr. This is not 2128 /// always the type of the expr itself, if the return type is a reference 2129 /// type. 2130 QualType getCallReturnType() const; 2131 2132 SourceLocation getRParenLoc() const { return RParenLoc; } 2133 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2134 2135 SourceRange getSourceRange() const LLVM_READONLY; 2136 SourceLocation getLocStart() const LLVM_READONLY; 2137 SourceLocation getLocEnd() const LLVM_READONLY; 2138 2139 static bool classof(const Stmt *T) { 2140 return T->getStmtClass() >= firstCallExprConstant && 2141 T->getStmtClass() <= lastCallExprConstant; 2142 } 2143 static bool classof(const CallExpr *) { return true; } 2144 2145 // Iterators 2146 child_range children() { 2147 return child_range(&SubExprs[0], 2148 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2149 } 2150}; 2151 2152/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2153/// 2154class MemberExpr : public Expr { 2155 /// Extra data stored in some member expressions. 2156 struct MemberNameQualifier { 2157 /// \brief The nested-name-specifier that qualifies the name, including 2158 /// source-location information. 2159 NestedNameSpecifierLoc QualifierLoc; 2160 2161 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2162 /// name qualifiers. 2163 DeclAccessPair FoundDecl; 2164 }; 2165 2166 /// Base - the expression for the base pointer or structure references. In 2167 /// X.F, this is "X". 2168 Stmt *Base; 2169 2170 /// MemberDecl - This is the decl being referenced by the field/member name. 2171 /// In X.F, this is the decl referenced by F. 2172 ValueDecl *MemberDecl; 2173 2174 /// MemberDNLoc - Provides source/type location info for the 2175 /// declaration name embedded in MemberDecl. 2176 DeclarationNameLoc MemberDNLoc; 2177 2178 /// MemberLoc - This is the location of the member name. 2179 SourceLocation MemberLoc; 2180 2181 /// IsArrow - True if this is "X->F", false if this is "X.F". 2182 bool IsArrow : 1; 2183 2184 /// \brief True if this member expression used a nested-name-specifier to 2185 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2186 /// declaration. When true, a MemberNameQualifier 2187 /// structure is allocated immediately after the MemberExpr. 2188 bool HasQualifierOrFoundDecl : 1; 2189 2190 /// \brief True if this member expression specified a template keyword 2191 /// and/or a template argument list explicitly, e.g., x->f<int>, 2192 /// x->template f, x->template f<int>. 2193 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2194 /// TemplateArguments (if any) are allocated immediately after 2195 /// the MemberExpr or, if the member expression also has a qualifier, 2196 /// after the MemberNameQualifier structure. 2197 bool HasTemplateKWAndArgsInfo : 1; 2198 2199 /// \brief True if this member expression refers to a method that 2200 /// was resolved from an overloaded set having size greater than 1. 2201 bool HadMultipleCandidates : 1; 2202 2203 /// \brief Retrieve the qualifier that preceded the member name, if any. 2204 MemberNameQualifier *getMemberQualifier() { 2205 assert(HasQualifierOrFoundDecl); 2206 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2207 } 2208 2209 /// \brief Retrieve the qualifier that preceded the member name, if any. 2210 const MemberNameQualifier *getMemberQualifier() const { 2211 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2212 } 2213 2214public: 2215 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2216 const DeclarationNameInfo &NameInfo, QualType ty, 2217 ExprValueKind VK, ExprObjectKind OK) 2218 : Expr(MemberExprClass, ty, VK, OK, 2219 base->isTypeDependent(), 2220 base->isValueDependent(), 2221 base->isInstantiationDependent(), 2222 base->containsUnexpandedParameterPack()), 2223 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()), 2224 MemberLoc(NameInfo.getLoc()), IsArrow(isarrow), 2225 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2226 HadMultipleCandidates(false) { 2227 assert(memberdecl->getDeclName() == NameInfo.getName()); 2228 } 2229 2230 // NOTE: this constructor should be used only when it is known that 2231 // the member name can not provide additional syntactic info 2232 // (i.e., source locations for C++ operator names or type source info 2233 // for constructors, destructors and conversion operators). 2234 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2235 SourceLocation l, QualType ty, 2236 ExprValueKind VK, ExprObjectKind OK) 2237 : Expr(MemberExprClass, ty, VK, OK, 2238 base->isTypeDependent(), base->isValueDependent(), 2239 base->isInstantiationDependent(), 2240 base->containsUnexpandedParameterPack()), 2241 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l), 2242 IsArrow(isarrow), 2243 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2244 HadMultipleCandidates(false) {} 2245 2246 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2247 NestedNameSpecifierLoc QualifierLoc, 2248 SourceLocation TemplateKWLoc, 2249 ValueDecl *memberdecl, DeclAccessPair founddecl, 2250 DeclarationNameInfo MemberNameInfo, 2251 const TemplateArgumentListInfo *targs, 2252 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2253 2254 void setBase(Expr *E) { Base = E; } 2255 Expr *getBase() const { return cast<Expr>(Base); } 2256 2257 /// \brief Retrieve the member declaration to which this expression refers. 2258 /// 2259 /// The returned declaration will either be a FieldDecl or (in C++) 2260 /// a CXXMethodDecl. 2261 ValueDecl *getMemberDecl() const { return MemberDecl; } 2262 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2263 2264 /// \brief Retrieves the declaration found by lookup. 2265 DeclAccessPair getFoundDecl() const { 2266 if (!HasQualifierOrFoundDecl) 2267 return DeclAccessPair::make(getMemberDecl(), 2268 getMemberDecl()->getAccess()); 2269 return getMemberQualifier()->FoundDecl; 2270 } 2271 2272 /// \brief Determines whether this member expression actually had 2273 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2274 /// x->Base::foo. 2275 bool hasQualifier() const { return getQualifier() != 0; } 2276 2277 /// \brief If the member name was qualified, retrieves the 2278 /// nested-name-specifier that precedes the member name. Otherwise, returns 2279 /// NULL. 2280 NestedNameSpecifier *getQualifier() const { 2281 if (!HasQualifierOrFoundDecl) 2282 return 0; 2283 2284 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2285 } 2286 2287 /// \brief If the member name was qualified, retrieves the 2288 /// nested-name-specifier that precedes the member name, with source-location 2289 /// information. 2290 NestedNameSpecifierLoc getQualifierLoc() const { 2291 if (!hasQualifier()) 2292 return NestedNameSpecifierLoc(); 2293 2294 return getMemberQualifier()->QualifierLoc; 2295 } 2296 2297 /// \brief Return the optional template keyword and arguments info. 2298 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 2299 if (!HasTemplateKWAndArgsInfo) 2300 return 0; 2301 2302 if (!HasQualifierOrFoundDecl) 2303 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 2304 2305 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 2306 getMemberQualifier() + 1); 2307 } 2308 2309 /// \brief Return the optional template keyword and arguments info. 2310 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 2311 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo(); 2312 } 2313 2314 /// \brief Retrieve the location of the template keyword preceding 2315 /// the member name, if any. 2316 SourceLocation getTemplateKeywordLoc() const { 2317 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2318 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 2319 } 2320 2321 /// \brief Retrieve the location of the left angle bracket starting the 2322 /// explicit template argument list following the member name, if any. 2323 SourceLocation getLAngleLoc() const { 2324 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2325 return getTemplateKWAndArgsInfo()->LAngleLoc; 2326 } 2327 2328 /// \brief Retrieve the location of the right angle bracket ending the 2329 /// explicit template argument list following the member name, if any. 2330 SourceLocation getRAngleLoc() const { 2331 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2332 return getTemplateKWAndArgsInfo()->RAngleLoc; 2333 } 2334 2335 /// Determines whether the member name was preceded by the template keyword. 2336 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2337 2338 /// \brief Determines whether the member name was followed by an 2339 /// explicit template argument list. 2340 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2341 2342 /// \brief Copies the template arguments (if present) into the given 2343 /// structure. 2344 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2345 if (hasExplicitTemplateArgs()) 2346 getExplicitTemplateArgs().copyInto(List); 2347 } 2348 2349 /// \brief Retrieve the explicit template argument list that 2350 /// follow the member template name. This must only be called on an 2351 /// expression with explicit template arguments. 2352 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2353 assert(hasExplicitTemplateArgs()); 2354 return *getTemplateKWAndArgsInfo(); 2355 } 2356 2357 /// \brief Retrieve the explicit template argument list that 2358 /// followed the member template name. This must only be called on 2359 /// an expression with explicit template arguments. 2360 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2361 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2362 } 2363 2364 /// \brief Retrieves the optional explicit template arguments. 2365 /// This points to the same data as getExplicitTemplateArgs(), but 2366 /// returns null if there are no explicit template arguments. 2367 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2368 if (!hasExplicitTemplateArgs()) return 0; 2369 return &getExplicitTemplateArgs(); 2370 } 2371 2372 /// \brief Retrieve the template arguments provided as part of this 2373 /// template-id. 2374 const TemplateArgumentLoc *getTemplateArgs() const { 2375 if (!hasExplicitTemplateArgs()) 2376 return 0; 2377 2378 return getExplicitTemplateArgs().getTemplateArgs(); 2379 } 2380 2381 /// \brief Retrieve the number of template arguments provided as part of this 2382 /// template-id. 2383 unsigned getNumTemplateArgs() const { 2384 if (!hasExplicitTemplateArgs()) 2385 return 0; 2386 2387 return getExplicitTemplateArgs().NumTemplateArgs; 2388 } 2389 2390 /// \brief Retrieve the member declaration name info. 2391 DeclarationNameInfo getMemberNameInfo() const { 2392 return DeclarationNameInfo(MemberDecl->getDeclName(), 2393 MemberLoc, MemberDNLoc); 2394 } 2395 2396 bool isArrow() const { return IsArrow; } 2397 void setArrow(bool A) { IsArrow = A; } 2398 2399 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2400 /// location of 'F'. 2401 SourceLocation getMemberLoc() const { return MemberLoc; } 2402 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2403 2404 SourceRange getSourceRange() const LLVM_READONLY; 2405 SourceLocation getLocStart() const LLVM_READONLY; 2406 SourceLocation getLocEnd() const LLVM_READONLY; 2407 2408 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; } 2409 2410 /// \brief Determine whether the base of this explicit is implicit. 2411 bool isImplicitAccess() const { 2412 return getBase() && getBase()->isImplicitCXXThis(); 2413 } 2414 2415 /// \brief Returns true if this member expression refers to a method that 2416 /// was resolved from an overloaded set having size greater than 1. 2417 bool hadMultipleCandidates() const { 2418 return HadMultipleCandidates; 2419 } 2420 /// \brief Sets the flag telling whether this expression refers to 2421 /// a method that was resolved from an overloaded set having size 2422 /// greater than 1. 2423 void setHadMultipleCandidates(bool V = true) { 2424 HadMultipleCandidates = V; 2425 } 2426 2427 static bool classof(const Stmt *T) { 2428 return T->getStmtClass() == MemberExprClass; 2429 } 2430 static bool classof(const MemberExpr *) { return true; } 2431 2432 // Iterators 2433 child_range children() { return child_range(&Base, &Base+1); } 2434 2435 friend class ASTReader; 2436 friend class ASTStmtWriter; 2437}; 2438 2439/// CompoundLiteralExpr - [C99 6.5.2.5] 2440/// 2441class CompoundLiteralExpr : public Expr { 2442 /// LParenLoc - If non-null, this is the location of the left paren in a 2443 /// compound literal like "(int){4}". This can be null if this is a 2444 /// synthesized compound expression. 2445 SourceLocation LParenLoc; 2446 2447 /// The type as written. This can be an incomplete array type, in 2448 /// which case the actual expression type will be different. 2449 /// The int part of the pair stores whether this expr is file scope. 2450 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope; 2451 Stmt *Init; 2452public: 2453 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2454 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2455 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2456 tinfo->getType()->isDependentType(), 2457 init->isValueDependent(), 2458 (init->isInstantiationDependent() || 2459 tinfo->getType()->isInstantiationDependentType()), 2460 init->containsUnexpandedParameterPack()), 2461 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {} 2462 2463 /// \brief Construct an empty compound literal. 2464 explicit CompoundLiteralExpr(EmptyShell Empty) 2465 : Expr(CompoundLiteralExprClass, Empty) { } 2466 2467 const Expr *getInitializer() const { return cast<Expr>(Init); } 2468 Expr *getInitializer() { return cast<Expr>(Init); } 2469 void setInitializer(Expr *E) { Init = E; } 2470 2471 bool isFileScope() const { return TInfoAndScope.getInt(); } 2472 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); } 2473 2474 SourceLocation getLParenLoc() const { return LParenLoc; } 2475 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2476 2477 TypeSourceInfo *getTypeSourceInfo() const { 2478 return TInfoAndScope.getPointer(); 2479 } 2480 void setTypeSourceInfo(TypeSourceInfo *tinfo) { 2481 TInfoAndScope.setPointer(tinfo); 2482 } 2483 2484 SourceRange getSourceRange() const LLVM_READONLY { 2485 // FIXME: Init should never be null. 2486 if (!Init) 2487 return SourceRange(); 2488 if (LParenLoc.isInvalid()) 2489 return Init->getSourceRange(); 2490 return SourceRange(LParenLoc, Init->getLocEnd()); 2491 } 2492 2493 static bool classof(const Stmt *T) { 2494 return T->getStmtClass() == CompoundLiteralExprClass; 2495 } 2496 static bool classof(const CompoundLiteralExpr *) { return true; } 2497 2498 // Iterators 2499 child_range children() { return child_range(&Init, &Init+1); } 2500}; 2501 2502/// CastExpr - Base class for type casts, including both implicit 2503/// casts (ImplicitCastExpr) and explicit casts that have some 2504/// representation in the source code (ExplicitCastExpr's derived 2505/// classes). 2506class CastExpr : public Expr { 2507public: 2508 typedef clang::CastKind CastKind; 2509 2510private: 2511 Stmt *Op; 2512 2513 void CheckCastConsistency() const; 2514 2515 const CXXBaseSpecifier * const *path_buffer() const { 2516 return const_cast<CastExpr*>(this)->path_buffer(); 2517 } 2518 CXXBaseSpecifier **path_buffer(); 2519 2520 void setBasePathSize(unsigned basePathSize) { 2521 CastExprBits.BasePathSize = basePathSize; 2522 assert(CastExprBits.BasePathSize == basePathSize && 2523 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2524 } 2525 2526protected: 2527 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2528 const CastKind kind, Expr *op, unsigned BasePathSize) : 2529 Expr(SC, ty, VK, OK_Ordinary, 2530 // Cast expressions are type-dependent if the type is 2531 // dependent (C++ [temp.dep.expr]p3). 2532 ty->isDependentType(), 2533 // Cast expressions are value-dependent if the type is 2534 // dependent or if the subexpression is value-dependent. 2535 ty->isDependentType() || (op && op->isValueDependent()), 2536 (ty->isInstantiationDependentType() || 2537 (op && op->isInstantiationDependent())), 2538 (ty->containsUnexpandedParameterPack() || 2539 op->containsUnexpandedParameterPack())), 2540 Op(op) { 2541 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2542 CastExprBits.Kind = kind; 2543 setBasePathSize(BasePathSize); 2544#ifndef NDEBUG 2545 CheckCastConsistency(); 2546#endif 2547 } 2548 2549 /// \brief Construct an empty cast. 2550 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2551 : Expr(SC, Empty) { 2552 setBasePathSize(BasePathSize); 2553 } 2554 2555public: 2556 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2557 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2558 const char *getCastKindName() const; 2559 2560 Expr *getSubExpr() { return cast<Expr>(Op); } 2561 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2562 void setSubExpr(Expr *E) { Op = E; } 2563 2564 /// \brief Retrieve the cast subexpression as it was written in the source 2565 /// code, looking through any implicit casts or other intermediate nodes 2566 /// introduced by semantic analysis. 2567 Expr *getSubExprAsWritten(); 2568 const Expr *getSubExprAsWritten() const { 2569 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2570 } 2571 2572 typedef CXXBaseSpecifier **path_iterator; 2573 typedef const CXXBaseSpecifier * const *path_const_iterator; 2574 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2575 unsigned path_size() const { return CastExprBits.BasePathSize; } 2576 path_iterator path_begin() { return path_buffer(); } 2577 path_iterator path_end() { return path_buffer() + path_size(); } 2578 path_const_iterator path_begin() const { return path_buffer(); } 2579 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2580 2581 void setCastPath(const CXXCastPath &Path); 2582 2583 static bool classof(const Stmt *T) { 2584 return T->getStmtClass() >= firstCastExprConstant && 2585 T->getStmtClass() <= lastCastExprConstant; 2586 } 2587 static bool classof(const CastExpr *) { return true; } 2588 2589 // Iterators 2590 child_range children() { return child_range(&Op, &Op+1); } 2591}; 2592 2593/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2594/// conversions, which have no direct representation in the original 2595/// source code. For example: converting T[]->T*, void f()->void 2596/// (*f)(), float->double, short->int, etc. 2597/// 2598/// In C, implicit casts always produce rvalues. However, in C++, an 2599/// implicit cast whose result is being bound to a reference will be 2600/// an lvalue or xvalue. For example: 2601/// 2602/// @code 2603/// class Base { }; 2604/// class Derived : public Base { }; 2605/// Derived &&ref(); 2606/// void f(Derived d) { 2607/// Base& b = d; // initializer is an ImplicitCastExpr 2608/// // to an lvalue of type Base 2609/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2610/// // to an xvalue of type Base 2611/// } 2612/// @endcode 2613class ImplicitCastExpr : public CastExpr { 2614private: 2615 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2616 unsigned BasePathLength, ExprValueKind VK) 2617 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2618 } 2619 2620 /// \brief Construct an empty implicit cast. 2621 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2622 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2623 2624public: 2625 enum OnStack_t { OnStack }; 2626 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2627 ExprValueKind VK) 2628 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2629 } 2630 2631 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2632 CastKind Kind, Expr *Operand, 2633 const CXXCastPath *BasePath, 2634 ExprValueKind Cat); 2635 2636 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2637 2638 SourceRange getSourceRange() const LLVM_READONLY { 2639 return getSubExpr()->getSourceRange(); 2640 } 2641 SourceLocation getLocStart() const LLVM_READONLY { 2642 return getSubExpr()->getLocStart(); 2643 } 2644 SourceLocation getLocEnd() const LLVM_READONLY { 2645 return getSubExpr()->getLocEnd(); 2646 } 2647 2648 static bool classof(const Stmt *T) { 2649 return T->getStmtClass() == ImplicitCastExprClass; 2650 } 2651 static bool classof(const ImplicitCastExpr *) { return true; } 2652}; 2653 2654inline Expr *Expr::IgnoreImpCasts() { 2655 Expr *e = this; 2656 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2657 e = ice->getSubExpr(); 2658 return e; 2659} 2660 2661/// ExplicitCastExpr - An explicit cast written in the source 2662/// code. 2663/// 2664/// This class is effectively an abstract class, because it provides 2665/// the basic representation of an explicitly-written cast without 2666/// specifying which kind of cast (C cast, functional cast, static 2667/// cast, etc.) was written; specific derived classes represent the 2668/// particular style of cast and its location information. 2669/// 2670/// Unlike implicit casts, explicit cast nodes have two different 2671/// types: the type that was written into the source code, and the 2672/// actual type of the expression as determined by semantic 2673/// analysis. These types may differ slightly. For example, in C++ one 2674/// can cast to a reference type, which indicates that the resulting 2675/// expression will be an lvalue or xvalue. The reference type, however, 2676/// will not be used as the type of the expression. 2677class ExplicitCastExpr : public CastExpr { 2678 /// TInfo - Source type info for the (written) type 2679 /// this expression is casting to. 2680 TypeSourceInfo *TInfo; 2681 2682protected: 2683 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2684 CastKind kind, Expr *op, unsigned PathSize, 2685 TypeSourceInfo *writtenTy) 2686 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2687 2688 /// \brief Construct an empty explicit cast. 2689 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2690 : CastExpr(SC, Shell, PathSize) { } 2691 2692public: 2693 /// getTypeInfoAsWritten - Returns the type source info for the type 2694 /// that this expression is casting to. 2695 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2696 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2697 2698 /// getTypeAsWritten - Returns the type that this expression is 2699 /// casting to, as written in the source code. 2700 QualType getTypeAsWritten() const { return TInfo->getType(); } 2701 2702 static bool classof(const Stmt *T) { 2703 return T->getStmtClass() >= firstExplicitCastExprConstant && 2704 T->getStmtClass() <= lastExplicitCastExprConstant; 2705 } 2706 static bool classof(const ExplicitCastExpr *) { return true; } 2707}; 2708 2709/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2710/// cast in C++ (C++ [expr.cast]), which uses the syntax 2711/// (Type)expr. For example: @c (int)f. 2712class CStyleCastExpr : public ExplicitCastExpr { 2713 SourceLocation LPLoc; // the location of the left paren 2714 SourceLocation RPLoc; // the location of the right paren 2715 2716 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2717 unsigned PathSize, TypeSourceInfo *writtenTy, 2718 SourceLocation l, SourceLocation r) 2719 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2720 writtenTy), LPLoc(l), RPLoc(r) {} 2721 2722 /// \brief Construct an empty C-style explicit cast. 2723 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2724 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2725 2726public: 2727 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2728 ExprValueKind VK, CastKind K, 2729 Expr *Op, const CXXCastPath *BasePath, 2730 TypeSourceInfo *WrittenTy, SourceLocation L, 2731 SourceLocation R); 2732 2733 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2734 2735 SourceLocation getLParenLoc() const { return LPLoc; } 2736 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2737 2738 SourceLocation getRParenLoc() const { return RPLoc; } 2739 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2740 2741 SourceRange getSourceRange() const LLVM_READONLY { 2742 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2743 } 2744 static bool classof(const Stmt *T) { 2745 return T->getStmtClass() == CStyleCastExprClass; 2746 } 2747 static bool classof(const CStyleCastExpr *) { return true; } 2748}; 2749 2750/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2751/// 2752/// This expression node kind describes a builtin binary operation, 2753/// such as "x + y" for integer values "x" and "y". The operands will 2754/// already have been converted to appropriate types (e.g., by 2755/// performing promotions or conversions). 2756/// 2757/// In C++, where operators may be overloaded, a different kind of 2758/// expression node (CXXOperatorCallExpr) is used to express the 2759/// invocation of an overloaded operator with operator syntax. Within 2760/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2761/// used to store an expression "x + y" depends on the subexpressions 2762/// for x and y. If neither x or y is type-dependent, and the "+" 2763/// operator resolves to a built-in operation, BinaryOperator will be 2764/// used to express the computation (x and y may still be 2765/// value-dependent). If either x or y is type-dependent, or if the 2766/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2767/// be used to express the computation. 2768class BinaryOperator : public Expr { 2769public: 2770 typedef BinaryOperatorKind Opcode; 2771 2772private: 2773 unsigned Opc : 6; 2774 SourceLocation OpLoc; 2775 2776 enum { LHS, RHS, END_EXPR }; 2777 Stmt* SubExprs[END_EXPR]; 2778public: 2779 2780 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2781 ExprValueKind VK, ExprObjectKind OK, 2782 SourceLocation opLoc) 2783 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2784 lhs->isTypeDependent() || rhs->isTypeDependent(), 2785 lhs->isValueDependent() || rhs->isValueDependent(), 2786 (lhs->isInstantiationDependent() || 2787 rhs->isInstantiationDependent()), 2788 (lhs->containsUnexpandedParameterPack() || 2789 rhs->containsUnexpandedParameterPack())), 2790 Opc(opc), OpLoc(opLoc) { 2791 SubExprs[LHS] = lhs; 2792 SubExprs[RHS] = rhs; 2793 assert(!isCompoundAssignmentOp() && 2794 "Use ArithAssignBinaryOperator for compound assignments"); 2795 } 2796 2797 /// \brief Construct an empty binary operator. 2798 explicit BinaryOperator(EmptyShell Empty) 2799 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2800 2801 SourceLocation getExprLoc() const LLVM_READONLY { return OpLoc; } 2802 SourceLocation getOperatorLoc() const { return OpLoc; } 2803 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2804 2805 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2806 void setOpcode(Opcode O) { Opc = O; } 2807 2808 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2809 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2810 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2811 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2812 2813 SourceRange getSourceRange() const LLVM_READONLY { 2814 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2815 } 2816 2817 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2818 /// corresponds to, e.g. "<<=". 2819 static const char *getOpcodeStr(Opcode Op); 2820 2821 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2822 2823 /// \brief Retrieve the binary opcode that corresponds to the given 2824 /// overloaded operator. 2825 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2826 2827 /// \brief Retrieve the overloaded operator kind that corresponds to 2828 /// the given binary opcode. 2829 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2830 2831 /// predicates to categorize the respective opcodes. 2832 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2833 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2834 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2835 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2836 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2837 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2838 2839 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2840 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2841 2842 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2843 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2844 2845 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2846 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2847 2848 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2849 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2850 2851 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2852 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2853 2854 static bool isAssignmentOp(Opcode Opc) { 2855 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2856 } 2857 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2858 2859 static bool isCompoundAssignmentOp(Opcode Opc) { 2860 return Opc > BO_Assign && Opc <= BO_OrAssign; 2861 } 2862 bool isCompoundAssignmentOp() const { 2863 return isCompoundAssignmentOp(getOpcode()); 2864 } 2865 static Opcode getOpForCompoundAssignment(Opcode Opc) { 2866 assert(isCompoundAssignmentOp(Opc)); 2867 if (Opc >= BO_AndAssign) 2868 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 2869 else 2870 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 2871 } 2872 2873 static bool isShiftAssignOp(Opcode Opc) { 2874 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2875 } 2876 bool isShiftAssignOp() const { 2877 return isShiftAssignOp(getOpcode()); 2878 } 2879 2880 static bool classof(const Stmt *S) { 2881 return S->getStmtClass() >= firstBinaryOperatorConstant && 2882 S->getStmtClass() <= lastBinaryOperatorConstant; 2883 } 2884 static bool classof(const BinaryOperator *) { return true; } 2885 2886 // Iterators 2887 child_range children() { 2888 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2889 } 2890 2891protected: 2892 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2893 ExprValueKind VK, ExprObjectKind OK, 2894 SourceLocation opLoc, bool dead) 2895 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2896 lhs->isTypeDependent() || rhs->isTypeDependent(), 2897 lhs->isValueDependent() || rhs->isValueDependent(), 2898 (lhs->isInstantiationDependent() || 2899 rhs->isInstantiationDependent()), 2900 (lhs->containsUnexpandedParameterPack() || 2901 rhs->containsUnexpandedParameterPack())), 2902 Opc(opc), OpLoc(opLoc) { 2903 SubExprs[LHS] = lhs; 2904 SubExprs[RHS] = rhs; 2905 } 2906 2907 BinaryOperator(StmtClass SC, EmptyShell Empty) 2908 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2909}; 2910 2911/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2912/// track of the type the operation is performed in. Due to the semantics of 2913/// these operators, the operands are promoted, the arithmetic performed, an 2914/// implicit conversion back to the result type done, then the assignment takes 2915/// place. This captures the intermediate type which the computation is done 2916/// in. 2917class CompoundAssignOperator : public BinaryOperator { 2918 QualType ComputationLHSType; 2919 QualType ComputationResultType; 2920public: 2921 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2922 ExprValueKind VK, ExprObjectKind OK, 2923 QualType CompLHSType, QualType CompResultType, 2924 SourceLocation OpLoc) 2925 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2926 ComputationLHSType(CompLHSType), 2927 ComputationResultType(CompResultType) { 2928 assert(isCompoundAssignmentOp() && 2929 "Only should be used for compound assignments"); 2930 } 2931 2932 /// \brief Build an empty compound assignment operator expression. 2933 explicit CompoundAssignOperator(EmptyShell Empty) 2934 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2935 2936 // The two computation types are the type the LHS is converted 2937 // to for the computation and the type of the result; the two are 2938 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2939 QualType getComputationLHSType() const { return ComputationLHSType; } 2940 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2941 2942 QualType getComputationResultType() const { return ComputationResultType; } 2943 void setComputationResultType(QualType T) { ComputationResultType = T; } 2944 2945 static bool classof(const CompoundAssignOperator *) { return true; } 2946 static bool classof(const Stmt *S) { 2947 return S->getStmtClass() == CompoundAssignOperatorClass; 2948 } 2949}; 2950 2951/// AbstractConditionalOperator - An abstract base class for 2952/// ConditionalOperator and BinaryConditionalOperator. 2953class AbstractConditionalOperator : public Expr { 2954 SourceLocation QuestionLoc, ColonLoc; 2955 friend class ASTStmtReader; 2956 2957protected: 2958 AbstractConditionalOperator(StmtClass SC, QualType T, 2959 ExprValueKind VK, ExprObjectKind OK, 2960 bool TD, bool VD, bool ID, 2961 bool ContainsUnexpandedParameterPack, 2962 SourceLocation qloc, 2963 SourceLocation cloc) 2964 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 2965 QuestionLoc(qloc), ColonLoc(cloc) {} 2966 2967 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2968 : Expr(SC, Empty) { } 2969 2970public: 2971 // getCond - Return the expression representing the condition for 2972 // the ?: operator. 2973 Expr *getCond() const; 2974 2975 // getTrueExpr - Return the subexpression representing the value of 2976 // the expression if the condition evaluates to true. 2977 Expr *getTrueExpr() const; 2978 2979 // getFalseExpr - Return the subexpression representing the value of 2980 // the expression if the condition evaluates to false. This is 2981 // the same as getRHS. 2982 Expr *getFalseExpr() const; 2983 2984 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2985 SourceLocation getColonLoc() const { return ColonLoc; } 2986 2987 static bool classof(const Stmt *T) { 2988 return T->getStmtClass() == ConditionalOperatorClass || 2989 T->getStmtClass() == BinaryConditionalOperatorClass; 2990 } 2991 static bool classof(const AbstractConditionalOperator *) { return true; } 2992}; 2993 2994/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2995/// middle" extension is a BinaryConditionalOperator. 2996class ConditionalOperator : public AbstractConditionalOperator { 2997 enum { COND, LHS, RHS, END_EXPR }; 2998 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2999 3000 friend class ASTStmtReader; 3001public: 3002 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 3003 SourceLocation CLoc, Expr *rhs, 3004 QualType t, ExprValueKind VK, ExprObjectKind OK) 3005 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 3006 // FIXME: the type of the conditional operator doesn't 3007 // depend on the type of the conditional, but the standard 3008 // seems to imply that it could. File a bug! 3009 (lhs->isTypeDependent() || rhs->isTypeDependent()), 3010 (cond->isValueDependent() || lhs->isValueDependent() || 3011 rhs->isValueDependent()), 3012 (cond->isInstantiationDependent() || 3013 lhs->isInstantiationDependent() || 3014 rhs->isInstantiationDependent()), 3015 (cond->containsUnexpandedParameterPack() || 3016 lhs->containsUnexpandedParameterPack() || 3017 rhs->containsUnexpandedParameterPack()), 3018 QLoc, CLoc) { 3019 SubExprs[COND] = cond; 3020 SubExprs[LHS] = lhs; 3021 SubExprs[RHS] = rhs; 3022 } 3023 3024 /// \brief Build an empty conditional operator. 3025 explicit ConditionalOperator(EmptyShell Empty) 3026 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 3027 3028 // getCond - Return the expression representing the condition for 3029 // the ?: operator. 3030 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3031 3032 // getTrueExpr - Return the subexpression representing the value of 3033 // the expression if the condition evaluates to true. 3034 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3035 3036 // getFalseExpr - Return the subexpression representing the value of 3037 // the expression if the condition evaluates to false. This is 3038 // the same as getRHS. 3039 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3040 3041 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3042 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3043 3044 SourceRange getSourceRange() const LLVM_READONLY { 3045 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 3046 } 3047 static bool classof(const Stmt *T) { 3048 return T->getStmtClass() == ConditionalOperatorClass; 3049 } 3050 static bool classof(const ConditionalOperator *) { return true; } 3051 3052 // Iterators 3053 child_range children() { 3054 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3055 } 3056}; 3057 3058/// BinaryConditionalOperator - The GNU extension to the conditional 3059/// operator which allows the middle operand to be omitted. 3060/// 3061/// This is a different expression kind on the assumption that almost 3062/// every client ends up needing to know that these are different. 3063class BinaryConditionalOperator : public AbstractConditionalOperator { 3064 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3065 3066 /// - the common condition/left-hand-side expression, which will be 3067 /// evaluated as the opaque value 3068 /// - the condition, expressed in terms of the opaque value 3069 /// - the left-hand-side, expressed in terms of the opaque value 3070 /// - the right-hand-side 3071 Stmt *SubExprs[NUM_SUBEXPRS]; 3072 OpaqueValueExpr *OpaqueValue; 3073 3074 friend class ASTStmtReader; 3075public: 3076 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3077 Expr *cond, Expr *lhs, Expr *rhs, 3078 SourceLocation qloc, SourceLocation cloc, 3079 QualType t, ExprValueKind VK, ExprObjectKind OK) 3080 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3081 (common->isTypeDependent() || rhs->isTypeDependent()), 3082 (common->isValueDependent() || rhs->isValueDependent()), 3083 (common->isInstantiationDependent() || 3084 rhs->isInstantiationDependent()), 3085 (common->containsUnexpandedParameterPack() || 3086 rhs->containsUnexpandedParameterPack()), 3087 qloc, cloc), 3088 OpaqueValue(opaqueValue) { 3089 SubExprs[COMMON] = common; 3090 SubExprs[COND] = cond; 3091 SubExprs[LHS] = lhs; 3092 SubExprs[RHS] = rhs; 3093 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value"); 3094 } 3095 3096 /// \brief Build an empty conditional operator. 3097 explicit BinaryConditionalOperator(EmptyShell Empty) 3098 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3099 3100 /// \brief getCommon - Return the common expression, written to the 3101 /// left of the condition. The opaque value will be bound to the 3102 /// result of this expression. 3103 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3104 3105 /// \brief getOpaqueValue - Return the opaque value placeholder. 3106 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3107 3108 /// \brief getCond - Return the condition expression; this is defined 3109 /// in terms of the opaque value. 3110 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3111 3112 /// \brief getTrueExpr - Return the subexpression which will be 3113 /// evaluated if the condition evaluates to true; this is defined 3114 /// in terms of the opaque value. 3115 Expr *getTrueExpr() const { 3116 return cast<Expr>(SubExprs[LHS]); 3117 } 3118 3119 /// \brief getFalseExpr - Return the subexpression which will be 3120 /// evaluated if the condnition evaluates to false; this is 3121 /// defined in terms of the opaque value. 3122 Expr *getFalseExpr() const { 3123 return cast<Expr>(SubExprs[RHS]); 3124 } 3125 3126 SourceRange getSourceRange() const LLVM_READONLY { 3127 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 3128 } 3129 static bool classof(const Stmt *T) { 3130 return T->getStmtClass() == BinaryConditionalOperatorClass; 3131 } 3132 static bool classof(const BinaryConditionalOperator *) { return true; } 3133 3134 // Iterators 3135 child_range children() { 3136 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3137 } 3138}; 3139 3140inline Expr *AbstractConditionalOperator::getCond() const { 3141 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3142 return co->getCond(); 3143 return cast<BinaryConditionalOperator>(this)->getCond(); 3144} 3145 3146inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3147 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3148 return co->getTrueExpr(); 3149 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3150} 3151 3152inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3153 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3154 return co->getFalseExpr(); 3155 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3156} 3157 3158/// AddrLabelExpr - The GNU address of label extension, representing &&label. 3159class AddrLabelExpr : public Expr { 3160 SourceLocation AmpAmpLoc, LabelLoc; 3161 LabelDecl *Label; 3162public: 3163 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3164 QualType t) 3165 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3166 false), 3167 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3168 3169 /// \brief Build an empty address of a label expression. 3170 explicit AddrLabelExpr(EmptyShell Empty) 3171 : Expr(AddrLabelExprClass, Empty) { } 3172 3173 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3174 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3175 SourceLocation getLabelLoc() const { return LabelLoc; } 3176 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3177 3178 SourceRange getSourceRange() const LLVM_READONLY { 3179 return SourceRange(AmpAmpLoc, LabelLoc); 3180 } 3181 3182 LabelDecl *getLabel() const { return Label; } 3183 void setLabel(LabelDecl *L) { Label = L; } 3184 3185 static bool classof(const Stmt *T) { 3186 return T->getStmtClass() == AddrLabelExprClass; 3187 } 3188 static bool classof(const AddrLabelExpr *) { return true; } 3189 3190 // Iterators 3191 child_range children() { return child_range(); } 3192}; 3193 3194/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3195/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3196/// takes the value of the last subexpression. 3197/// 3198/// A StmtExpr is always an r-value; values "returned" out of a 3199/// StmtExpr will be copied. 3200class StmtExpr : public Expr { 3201 Stmt *SubStmt; 3202 SourceLocation LParenLoc, RParenLoc; 3203public: 3204 // FIXME: Does type-dependence need to be computed differently? 3205 // FIXME: Do we need to compute instantiation instantiation-dependence for 3206 // statements? (ugh!) 3207 StmtExpr(CompoundStmt *substmt, QualType T, 3208 SourceLocation lp, SourceLocation rp) : 3209 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3210 T->isDependentType(), false, false, false), 3211 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3212 3213 /// \brief Build an empty statement expression. 3214 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3215 3216 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3217 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3218 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3219 3220 SourceRange getSourceRange() const LLVM_READONLY { 3221 return SourceRange(LParenLoc, RParenLoc); 3222 } 3223 3224 SourceLocation getLParenLoc() const { return LParenLoc; } 3225 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3226 SourceLocation getRParenLoc() const { return RParenLoc; } 3227 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3228 3229 static bool classof(const Stmt *T) { 3230 return T->getStmtClass() == StmtExprClass; 3231 } 3232 static bool classof(const StmtExpr *) { return true; } 3233 3234 // Iterators 3235 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3236}; 3237 3238 3239/// ShuffleVectorExpr - clang-specific builtin-in function 3240/// __builtin_shufflevector. 3241/// This AST node represents a operator that does a constant 3242/// shuffle, similar to LLVM's shufflevector instruction. It takes 3243/// two vectors and a variable number of constant indices, 3244/// and returns the appropriately shuffled vector. 3245class ShuffleVectorExpr : public Expr { 3246 SourceLocation BuiltinLoc, RParenLoc; 3247 3248 // SubExprs - the list of values passed to the __builtin_shufflevector 3249 // function. The first two are vectors, and the rest are constant 3250 // indices. The number of values in this list is always 3251 // 2+the number of indices in the vector type. 3252 Stmt **SubExprs; 3253 unsigned NumExprs; 3254 3255public: 3256 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3257 QualType Type, SourceLocation BLoc, 3258 SourceLocation RP); 3259 3260 /// \brief Build an empty vector-shuffle expression. 3261 explicit ShuffleVectorExpr(EmptyShell Empty) 3262 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3263 3264 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3265 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3266 3267 SourceLocation getRParenLoc() const { return RParenLoc; } 3268 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3269 3270 SourceRange getSourceRange() const LLVM_READONLY { 3271 return SourceRange(BuiltinLoc, RParenLoc); 3272 } 3273 static bool classof(const Stmt *T) { 3274 return T->getStmtClass() == ShuffleVectorExprClass; 3275 } 3276 static bool classof(const ShuffleVectorExpr *) { return true; } 3277 3278 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3279 /// constant expression, the actual arguments passed in, and the function 3280 /// pointers. 3281 unsigned getNumSubExprs() const { return NumExprs; } 3282 3283 /// \brief Retrieve the array of expressions. 3284 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3285 3286 /// getExpr - Return the Expr at the specified index. 3287 Expr *getExpr(unsigned Index) { 3288 assert((Index < NumExprs) && "Arg access out of range!"); 3289 return cast<Expr>(SubExprs[Index]); 3290 } 3291 const Expr *getExpr(unsigned Index) const { 3292 assert((Index < NumExprs) && "Arg access out of range!"); 3293 return cast<Expr>(SubExprs[Index]); 3294 } 3295 3296 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3297 3298 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3299 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3300 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3301 } 3302 3303 // Iterators 3304 child_range children() { 3305 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3306 } 3307}; 3308 3309/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3310/// This AST node is similar to the conditional operator (?:) in C, with 3311/// the following exceptions: 3312/// - the test expression must be a integer constant expression. 3313/// - the expression returned acts like the chosen subexpression in every 3314/// visible way: the type is the same as that of the chosen subexpression, 3315/// and all predicates (whether it's an l-value, whether it's an integer 3316/// constant expression, etc.) return the same result as for the chosen 3317/// sub-expression. 3318class ChooseExpr : public Expr { 3319 enum { COND, LHS, RHS, END_EXPR }; 3320 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3321 SourceLocation BuiltinLoc, RParenLoc; 3322public: 3323 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3324 QualType t, ExprValueKind VK, ExprObjectKind OK, 3325 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3326 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3327 (cond->isInstantiationDependent() || 3328 lhs->isInstantiationDependent() || 3329 rhs->isInstantiationDependent()), 3330 (cond->containsUnexpandedParameterPack() || 3331 lhs->containsUnexpandedParameterPack() || 3332 rhs->containsUnexpandedParameterPack())), 3333 BuiltinLoc(BLoc), RParenLoc(RP) { 3334 SubExprs[COND] = cond; 3335 SubExprs[LHS] = lhs; 3336 SubExprs[RHS] = rhs; 3337 } 3338 3339 /// \brief Build an empty __builtin_choose_expr. 3340 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3341 3342 /// isConditionTrue - Return whether the condition is true (i.e. not 3343 /// equal to zero). 3344 bool isConditionTrue(const ASTContext &C) const; 3345 3346 /// getChosenSubExpr - Return the subexpression chosen according to the 3347 /// condition. 3348 Expr *getChosenSubExpr(const ASTContext &C) const { 3349 return isConditionTrue(C) ? getLHS() : getRHS(); 3350 } 3351 3352 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3353 void setCond(Expr *E) { SubExprs[COND] = E; } 3354 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3355 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3356 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3357 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3358 3359 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3360 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3361 3362 SourceLocation getRParenLoc() const { return RParenLoc; } 3363 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3364 3365 SourceRange getSourceRange() const LLVM_READONLY { 3366 return SourceRange(BuiltinLoc, RParenLoc); 3367 } 3368 static bool classof(const Stmt *T) { 3369 return T->getStmtClass() == ChooseExprClass; 3370 } 3371 static bool classof(const ChooseExpr *) { return true; } 3372 3373 // Iterators 3374 child_range children() { 3375 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3376 } 3377}; 3378 3379/// GNUNullExpr - Implements the GNU __null extension, which is a name 3380/// for a null pointer constant that has integral type (e.g., int or 3381/// long) and is the same size and alignment as a pointer. The __null 3382/// extension is typically only used by system headers, which define 3383/// NULL as __null in C++ rather than using 0 (which is an integer 3384/// that may not match the size of a pointer). 3385class GNUNullExpr : public Expr { 3386 /// TokenLoc - The location of the __null keyword. 3387 SourceLocation TokenLoc; 3388 3389public: 3390 GNUNullExpr(QualType Ty, SourceLocation Loc) 3391 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3392 false), 3393 TokenLoc(Loc) { } 3394 3395 /// \brief Build an empty GNU __null expression. 3396 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3397 3398 /// getTokenLocation - The location of the __null token. 3399 SourceLocation getTokenLocation() const { return TokenLoc; } 3400 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3401 3402 SourceRange getSourceRange() const LLVM_READONLY { 3403 return SourceRange(TokenLoc); 3404 } 3405 static bool classof(const Stmt *T) { 3406 return T->getStmtClass() == GNUNullExprClass; 3407 } 3408 static bool classof(const GNUNullExpr *) { return true; } 3409 3410 // Iterators 3411 child_range children() { return child_range(); } 3412}; 3413 3414/// VAArgExpr, used for the builtin function __builtin_va_arg. 3415class VAArgExpr : public Expr { 3416 Stmt *Val; 3417 TypeSourceInfo *TInfo; 3418 SourceLocation BuiltinLoc, RParenLoc; 3419public: 3420 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3421 SourceLocation RPLoc, QualType t) 3422 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3423 t->isDependentType(), false, 3424 (TInfo->getType()->isInstantiationDependentType() || 3425 e->isInstantiationDependent()), 3426 (TInfo->getType()->containsUnexpandedParameterPack() || 3427 e->containsUnexpandedParameterPack())), 3428 Val(e), TInfo(TInfo), 3429 BuiltinLoc(BLoc), 3430 RParenLoc(RPLoc) { } 3431 3432 /// \brief Create an empty __builtin_va_arg expression. 3433 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3434 3435 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3436 Expr *getSubExpr() { return cast<Expr>(Val); } 3437 void setSubExpr(Expr *E) { Val = E; } 3438 3439 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3440 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3441 3442 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3443 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3444 3445 SourceLocation getRParenLoc() const { return RParenLoc; } 3446 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3447 3448 SourceRange getSourceRange() const LLVM_READONLY { 3449 return SourceRange(BuiltinLoc, RParenLoc); 3450 } 3451 static bool classof(const Stmt *T) { 3452 return T->getStmtClass() == VAArgExprClass; 3453 } 3454 static bool classof(const VAArgExpr *) { return true; } 3455 3456 // Iterators 3457 child_range children() { return child_range(&Val, &Val+1); } 3458}; 3459 3460/// @brief Describes an C or C++ initializer list. 3461/// 3462/// InitListExpr describes an initializer list, which can be used to 3463/// initialize objects of different types, including 3464/// struct/class/union types, arrays, and vectors. For example: 3465/// 3466/// @code 3467/// struct foo x = { 1, { 2, 3 } }; 3468/// @endcode 3469/// 3470/// Prior to semantic analysis, an initializer list will represent the 3471/// initializer list as written by the user, but will have the 3472/// placeholder type "void". This initializer list is called the 3473/// syntactic form of the initializer, and may contain C99 designated 3474/// initializers (represented as DesignatedInitExprs), initializations 3475/// of subobject members without explicit braces, and so on. Clients 3476/// interested in the original syntax of the initializer list should 3477/// use the syntactic form of the initializer list. 3478/// 3479/// After semantic analysis, the initializer list will represent the 3480/// semantic form of the initializer, where the initializations of all 3481/// subobjects are made explicit with nested InitListExpr nodes and 3482/// C99 designators have been eliminated by placing the designated 3483/// initializations into the subobject they initialize. Additionally, 3484/// any "holes" in the initialization, where no initializer has been 3485/// specified for a particular subobject, will be replaced with 3486/// implicitly-generated ImplicitValueInitExpr expressions that 3487/// value-initialize the subobjects. Note, however, that the 3488/// initializer lists may still have fewer initializers than there are 3489/// elements to initialize within the object. 3490/// 3491/// Given the semantic form of the initializer list, one can retrieve 3492/// the original syntactic form of that initializer list (if it 3493/// exists) using getSyntacticForm(). Since many initializer lists 3494/// have the same syntactic and semantic forms, getSyntacticForm() may 3495/// return NULL, indicating that the current initializer list also 3496/// serves as its syntactic form. 3497class InitListExpr : public Expr { 3498 // FIXME: Eliminate this vector in favor of ASTContext allocation 3499 typedef ASTVector<Stmt *> InitExprsTy; 3500 InitExprsTy InitExprs; 3501 SourceLocation LBraceLoc, RBraceLoc; 3502 3503 /// Contains the initializer list that describes the syntactic form 3504 /// written in the source code. 3505 InitListExpr *SyntacticForm; 3506 3507 /// \brief Either: 3508 /// If this initializer list initializes an array with more elements than 3509 /// there are initializers in the list, specifies an expression to be used 3510 /// for value initialization of the rest of the elements. 3511 /// Or 3512 /// If this initializer list initializes a union, specifies which 3513 /// field within the union will be initialized. 3514 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3515 3516public: 3517 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3518 Expr **initexprs, unsigned numinits, 3519 SourceLocation rbraceloc); 3520 3521 /// \brief Build an empty initializer list. 3522 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3523 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3524 3525 unsigned getNumInits() const { return InitExprs.size(); } 3526 3527 /// \brief Retrieve the set of initializers. 3528 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3529 3530 const Expr *getInit(unsigned Init) const { 3531 assert(Init < getNumInits() && "Initializer access out of range!"); 3532 return cast_or_null<Expr>(InitExprs[Init]); 3533 } 3534 3535 Expr *getInit(unsigned Init) { 3536 assert(Init < getNumInits() && "Initializer access out of range!"); 3537 return cast_or_null<Expr>(InitExprs[Init]); 3538 } 3539 3540 void setInit(unsigned Init, Expr *expr) { 3541 assert(Init < getNumInits() && "Initializer access out of range!"); 3542 InitExprs[Init] = expr; 3543 } 3544 3545 /// \brief Reserve space for some number of initializers. 3546 void reserveInits(ASTContext &C, unsigned NumInits); 3547 3548 /// @brief Specify the number of initializers 3549 /// 3550 /// If there are more than @p NumInits initializers, the remaining 3551 /// initializers will be destroyed. If there are fewer than @p 3552 /// NumInits initializers, NULL expressions will be added for the 3553 /// unknown initializers. 3554 void resizeInits(ASTContext &Context, unsigned NumInits); 3555 3556 /// @brief Updates the initializer at index @p Init with the new 3557 /// expression @p expr, and returns the old expression at that 3558 /// location. 3559 /// 3560 /// When @p Init is out of range for this initializer list, the 3561 /// initializer list will be extended with NULL expressions to 3562 /// accommodate the new entry. 3563 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3564 3565 /// \brief If this initializer list initializes an array with more elements 3566 /// than there are initializers in the list, specifies an expression to be 3567 /// used for value initialization of the rest of the elements. 3568 Expr *getArrayFiller() { 3569 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3570 } 3571 const Expr *getArrayFiller() const { 3572 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3573 } 3574 void setArrayFiller(Expr *filler); 3575 3576 /// \brief Return true if this is an array initializer and its array "filler" 3577 /// has been set. 3578 bool hasArrayFiller() const { return getArrayFiller(); } 3579 3580 /// \brief If this initializes a union, specifies which field in the 3581 /// union to initialize. 3582 /// 3583 /// Typically, this field is the first named field within the 3584 /// union. However, a designated initializer can specify the 3585 /// initialization of a different field within the union. 3586 FieldDecl *getInitializedFieldInUnion() { 3587 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3588 } 3589 const FieldDecl *getInitializedFieldInUnion() const { 3590 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3591 } 3592 void setInitializedFieldInUnion(FieldDecl *FD) { 3593 ArrayFillerOrUnionFieldInit = FD; 3594 } 3595 3596 // Explicit InitListExpr's originate from source code (and have valid source 3597 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3598 bool isExplicit() { 3599 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3600 } 3601 3602 // Is this an initializer for an array of characters, initialized by a string 3603 // literal or an @encode? 3604 bool isStringLiteralInit() const; 3605 3606 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3607 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3608 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3609 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3610 3611 /// @brief Retrieve the initializer list that describes the 3612 /// syntactic form of the initializer. 3613 /// 3614 /// 3615 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3616 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3617 3618 bool hadArrayRangeDesignator() const { 3619 return InitListExprBits.HadArrayRangeDesignator != 0; 3620 } 3621 void sawArrayRangeDesignator(bool ARD = true) { 3622 InitListExprBits.HadArrayRangeDesignator = ARD; 3623 } 3624 3625 bool initializesStdInitializerList() const { 3626 return InitListExprBits.InitializesStdInitializerList != 0; 3627 } 3628 void setInitializesStdInitializerList(bool ISIL = true) { 3629 InitListExprBits.InitializesStdInitializerList = ISIL; 3630 } 3631 3632 SourceRange getSourceRange() const LLVM_READONLY; 3633 3634 static bool classof(const Stmt *T) { 3635 return T->getStmtClass() == InitListExprClass; 3636 } 3637 static bool classof(const InitListExpr *) { return true; } 3638 3639 // Iterators 3640 child_range children() { 3641 if (InitExprs.empty()) return child_range(); 3642 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3643 } 3644 3645 typedef InitExprsTy::iterator iterator; 3646 typedef InitExprsTy::const_iterator const_iterator; 3647 typedef InitExprsTy::reverse_iterator reverse_iterator; 3648 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3649 3650 iterator begin() { return InitExprs.begin(); } 3651 const_iterator begin() const { return InitExprs.begin(); } 3652 iterator end() { return InitExprs.end(); } 3653 const_iterator end() const { return InitExprs.end(); } 3654 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3655 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3656 reverse_iterator rend() { return InitExprs.rend(); } 3657 const_reverse_iterator rend() const { return InitExprs.rend(); } 3658 3659 friend class ASTStmtReader; 3660 friend class ASTStmtWriter; 3661}; 3662 3663/// @brief Represents a C99 designated initializer expression. 3664/// 3665/// A designated initializer expression (C99 6.7.8) contains one or 3666/// more designators (which can be field designators, array 3667/// designators, or GNU array-range designators) followed by an 3668/// expression that initializes the field or element(s) that the 3669/// designators refer to. For example, given: 3670/// 3671/// @code 3672/// struct point { 3673/// double x; 3674/// double y; 3675/// }; 3676/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3677/// @endcode 3678/// 3679/// The InitListExpr contains three DesignatedInitExprs, the first of 3680/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3681/// designators, one array designator for @c [2] followed by one field 3682/// designator for @c .y. The initalization expression will be 1.0. 3683class DesignatedInitExpr : public Expr { 3684public: 3685 /// \brief Forward declaration of the Designator class. 3686 class Designator; 3687 3688private: 3689 /// The location of the '=' or ':' prior to the actual initializer 3690 /// expression. 3691 SourceLocation EqualOrColonLoc; 3692 3693 /// Whether this designated initializer used the GNU deprecated 3694 /// syntax rather than the C99 '=' syntax. 3695 bool GNUSyntax : 1; 3696 3697 /// The number of designators in this initializer expression. 3698 unsigned NumDesignators : 15; 3699 3700 /// The number of subexpressions of this initializer expression, 3701 /// which contains both the initializer and any additional 3702 /// expressions used by array and array-range designators. 3703 unsigned NumSubExprs : 16; 3704 3705 /// \brief The designators in this designated initialization 3706 /// expression. 3707 Designator *Designators; 3708 3709 3710 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3711 const Designator *Designators, 3712 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3713 Expr **IndexExprs, unsigned NumIndexExprs, 3714 Expr *Init); 3715 3716 explicit DesignatedInitExpr(unsigned NumSubExprs) 3717 : Expr(DesignatedInitExprClass, EmptyShell()), 3718 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(0) { } 3719 3720public: 3721 /// A field designator, e.g., ".x". 3722 struct FieldDesignator { 3723 /// Refers to the field that is being initialized. The low bit 3724 /// of this field determines whether this is actually a pointer 3725 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3726 /// initially constructed, a field designator will store an 3727 /// IdentifierInfo*. After semantic analysis has resolved that 3728 /// name, the field designator will instead store a FieldDecl*. 3729 uintptr_t NameOrField; 3730 3731 /// The location of the '.' in the designated initializer. 3732 unsigned DotLoc; 3733 3734 /// The location of the field name in the designated initializer. 3735 unsigned FieldLoc; 3736 }; 3737 3738 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3739 struct ArrayOrRangeDesignator { 3740 /// Location of the first index expression within the designated 3741 /// initializer expression's list of subexpressions. 3742 unsigned Index; 3743 /// The location of the '[' starting the array range designator. 3744 unsigned LBracketLoc; 3745 /// The location of the ellipsis separating the start and end 3746 /// indices. Only valid for GNU array-range designators. 3747 unsigned EllipsisLoc; 3748 /// The location of the ']' terminating the array range designator. 3749 unsigned RBracketLoc; 3750 }; 3751 3752 /// @brief Represents a single C99 designator. 3753 /// 3754 /// @todo This class is infuriatingly similar to clang::Designator, 3755 /// but minor differences (storing indices vs. storing pointers) 3756 /// keep us from reusing it. Try harder, later, to rectify these 3757 /// differences. 3758 class Designator { 3759 /// @brief The kind of designator this describes. 3760 enum { 3761 FieldDesignator, 3762 ArrayDesignator, 3763 ArrayRangeDesignator 3764 } Kind; 3765 3766 union { 3767 /// A field designator, e.g., ".x". 3768 struct FieldDesignator Field; 3769 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3770 struct ArrayOrRangeDesignator ArrayOrRange; 3771 }; 3772 friend class DesignatedInitExpr; 3773 3774 public: 3775 Designator() {} 3776 3777 /// @brief Initializes a field designator. 3778 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3779 SourceLocation FieldLoc) 3780 : Kind(FieldDesignator) { 3781 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3782 Field.DotLoc = DotLoc.getRawEncoding(); 3783 Field.FieldLoc = FieldLoc.getRawEncoding(); 3784 } 3785 3786 /// @brief Initializes an array designator. 3787 Designator(unsigned Index, SourceLocation LBracketLoc, 3788 SourceLocation RBracketLoc) 3789 : Kind(ArrayDesignator) { 3790 ArrayOrRange.Index = Index; 3791 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3792 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3793 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3794 } 3795 3796 /// @brief Initializes a GNU array-range designator. 3797 Designator(unsigned Index, SourceLocation LBracketLoc, 3798 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3799 : Kind(ArrayRangeDesignator) { 3800 ArrayOrRange.Index = Index; 3801 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3802 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3803 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3804 } 3805 3806 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3807 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3808 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3809 3810 IdentifierInfo *getFieldName() const; 3811 3812 FieldDecl *getField() const { 3813 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3814 if (Field.NameOrField & 0x01) 3815 return 0; 3816 else 3817 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3818 } 3819 3820 void setField(FieldDecl *FD) { 3821 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3822 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3823 } 3824 3825 SourceLocation getDotLoc() const { 3826 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3827 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3828 } 3829 3830 SourceLocation getFieldLoc() const { 3831 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3832 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3833 } 3834 3835 SourceLocation getLBracketLoc() const { 3836 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3837 "Only valid on an array or array-range designator"); 3838 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3839 } 3840 3841 SourceLocation getRBracketLoc() const { 3842 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3843 "Only valid on an array or array-range designator"); 3844 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3845 } 3846 3847 SourceLocation getEllipsisLoc() const { 3848 assert(Kind == ArrayRangeDesignator && 3849 "Only valid on an array-range designator"); 3850 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3851 } 3852 3853 unsigned getFirstExprIndex() const { 3854 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3855 "Only valid on an array or array-range designator"); 3856 return ArrayOrRange.Index; 3857 } 3858 3859 SourceLocation getStartLocation() const { 3860 if (Kind == FieldDesignator) 3861 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3862 else 3863 return getLBracketLoc(); 3864 } 3865 SourceLocation getEndLocation() const { 3866 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3867 } 3868 SourceRange getSourceRange() const LLVM_READONLY { 3869 return SourceRange(getStartLocation(), getEndLocation()); 3870 } 3871 }; 3872 3873 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3874 unsigned NumDesignators, 3875 Expr **IndexExprs, unsigned NumIndexExprs, 3876 SourceLocation EqualOrColonLoc, 3877 bool GNUSyntax, Expr *Init); 3878 3879 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3880 3881 /// @brief Returns the number of designators in this initializer. 3882 unsigned size() const { return NumDesignators; } 3883 3884 // Iterator access to the designators. 3885 typedef Designator *designators_iterator; 3886 designators_iterator designators_begin() { return Designators; } 3887 designators_iterator designators_end() { 3888 return Designators + NumDesignators; 3889 } 3890 3891 typedef const Designator *const_designators_iterator; 3892 const_designators_iterator designators_begin() const { return Designators; } 3893 const_designators_iterator designators_end() const { 3894 return Designators + NumDesignators; 3895 } 3896 3897 typedef std::reverse_iterator<designators_iterator> 3898 reverse_designators_iterator; 3899 reverse_designators_iterator designators_rbegin() { 3900 return reverse_designators_iterator(designators_end()); 3901 } 3902 reverse_designators_iterator designators_rend() { 3903 return reverse_designators_iterator(designators_begin()); 3904 } 3905 3906 typedef std::reverse_iterator<const_designators_iterator> 3907 const_reverse_designators_iterator; 3908 const_reverse_designators_iterator designators_rbegin() const { 3909 return const_reverse_designators_iterator(designators_end()); 3910 } 3911 const_reverse_designators_iterator designators_rend() const { 3912 return const_reverse_designators_iterator(designators_begin()); 3913 } 3914 3915 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3916 3917 void setDesignators(ASTContext &C, const Designator *Desigs, 3918 unsigned NumDesigs); 3919 3920 Expr *getArrayIndex(const Designator& D); 3921 Expr *getArrayRangeStart(const Designator& D); 3922 Expr *getArrayRangeEnd(const Designator& D); 3923 3924 /// @brief Retrieve the location of the '=' that precedes the 3925 /// initializer value itself, if present. 3926 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3927 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3928 3929 /// @brief Determines whether this designated initializer used the 3930 /// deprecated GNU syntax for designated initializers. 3931 bool usesGNUSyntax() const { return GNUSyntax; } 3932 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3933 3934 /// @brief Retrieve the initializer value. 3935 Expr *getInit() const { 3936 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3937 } 3938 3939 void setInit(Expr *init) { 3940 *child_begin() = init; 3941 } 3942 3943 /// \brief Retrieve the total number of subexpressions in this 3944 /// designated initializer expression, including the actual 3945 /// initialized value and any expressions that occur within array 3946 /// and array-range designators. 3947 unsigned getNumSubExprs() const { return NumSubExprs; } 3948 3949 Expr *getSubExpr(unsigned Idx) { 3950 assert(Idx < NumSubExprs && "Subscript out of range"); 3951 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3952 Ptr += sizeof(DesignatedInitExpr); 3953 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3954 } 3955 3956 void setSubExpr(unsigned Idx, Expr *E) { 3957 assert(Idx < NumSubExprs && "Subscript out of range"); 3958 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3959 Ptr += sizeof(DesignatedInitExpr); 3960 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3961 } 3962 3963 /// \brief Replaces the designator at index @p Idx with the series 3964 /// of designators in [First, Last). 3965 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3966 const Designator *Last); 3967 3968 SourceRange getDesignatorsSourceRange() const; 3969 3970 SourceRange getSourceRange() const LLVM_READONLY; 3971 3972 static bool classof(const Stmt *T) { 3973 return T->getStmtClass() == DesignatedInitExprClass; 3974 } 3975 static bool classof(const DesignatedInitExpr *) { return true; } 3976 3977 // Iterators 3978 child_range children() { 3979 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3980 return child_range(begin, begin + NumSubExprs); 3981 } 3982}; 3983 3984/// \brief Represents an implicitly-generated value initialization of 3985/// an object of a given type. 3986/// 3987/// Implicit value initializations occur within semantic initializer 3988/// list expressions (InitListExpr) as placeholders for subobject 3989/// initializations not explicitly specified by the user. 3990/// 3991/// \see InitListExpr 3992class ImplicitValueInitExpr : public Expr { 3993public: 3994 explicit ImplicitValueInitExpr(QualType ty) 3995 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3996 false, false, ty->isInstantiationDependentType(), false) { } 3997 3998 /// \brief Construct an empty implicit value initialization. 3999 explicit ImplicitValueInitExpr(EmptyShell Empty) 4000 : Expr(ImplicitValueInitExprClass, Empty) { } 4001 4002 static bool classof(const Stmt *T) { 4003 return T->getStmtClass() == ImplicitValueInitExprClass; 4004 } 4005 static bool classof(const ImplicitValueInitExpr *) { return true; } 4006 4007 SourceRange getSourceRange() const LLVM_READONLY { 4008 return SourceRange(); 4009 } 4010 4011 // Iterators 4012 child_range children() { return child_range(); } 4013}; 4014 4015 4016class ParenListExpr : public Expr { 4017 Stmt **Exprs; 4018 unsigned NumExprs; 4019 SourceLocation LParenLoc, RParenLoc; 4020 4021public: 4022 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 4023 unsigned numexprs, SourceLocation rparenloc); 4024 4025 /// \brief Build an empty paren list. 4026 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 4027 4028 unsigned getNumExprs() const { return NumExprs; } 4029 4030 const Expr* getExpr(unsigned Init) const { 4031 assert(Init < getNumExprs() && "Initializer access out of range!"); 4032 return cast_or_null<Expr>(Exprs[Init]); 4033 } 4034 4035 Expr* getExpr(unsigned Init) { 4036 assert(Init < getNumExprs() && "Initializer access out of range!"); 4037 return cast_or_null<Expr>(Exprs[Init]); 4038 } 4039 4040 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 4041 4042 SourceLocation getLParenLoc() const { return LParenLoc; } 4043 SourceLocation getRParenLoc() const { return RParenLoc; } 4044 4045 SourceRange getSourceRange() const LLVM_READONLY { 4046 return SourceRange(LParenLoc, RParenLoc); 4047 } 4048 static bool classof(const Stmt *T) { 4049 return T->getStmtClass() == ParenListExprClass; 4050 } 4051 static bool classof(const ParenListExpr *) { return true; } 4052 4053 // Iterators 4054 child_range children() { 4055 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4056 } 4057 4058 friend class ASTStmtReader; 4059 friend class ASTStmtWriter; 4060}; 4061 4062 4063/// \brief Represents a C11 generic selection. 4064/// 4065/// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4066/// expression, followed by one or more generic associations. Each generic 4067/// association specifies a type name and an expression, or "default" and an 4068/// expression (in which case it is known as a default generic association). 4069/// The type and value of the generic selection are identical to those of its 4070/// result expression, which is defined as the expression in the generic 4071/// association with a type name that is compatible with the type of the 4072/// controlling expression, or the expression in the default generic association 4073/// if no types are compatible. For example: 4074/// 4075/// @code 4076/// _Generic(X, double: 1, float: 2, default: 3) 4077/// @endcode 4078/// 4079/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4080/// or 3 if "hello". 4081/// 4082/// As an extension, generic selections are allowed in C++, where the following 4083/// additional semantics apply: 4084/// 4085/// Any generic selection whose controlling expression is type-dependent or 4086/// which names a dependent type in its association list is result-dependent, 4087/// which means that the choice of result expression is dependent. 4088/// Result-dependent generic associations are both type- and value-dependent. 4089class GenericSelectionExpr : public Expr { 4090 enum { CONTROLLING, END_EXPR }; 4091 TypeSourceInfo **AssocTypes; 4092 Stmt **SubExprs; 4093 unsigned NumAssocs, ResultIndex; 4094 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4095 4096public: 4097 GenericSelectionExpr(ASTContext &Context, 4098 SourceLocation GenericLoc, Expr *ControllingExpr, 4099 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4100 unsigned NumAssocs, SourceLocation DefaultLoc, 4101 SourceLocation RParenLoc, 4102 bool ContainsUnexpandedParameterPack, 4103 unsigned ResultIndex); 4104 4105 /// This constructor is used in the result-dependent case. 4106 GenericSelectionExpr(ASTContext &Context, 4107 SourceLocation GenericLoc, Expr *ControllingExpr, 4108 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4109 unsigned NumAssocs, SourceLocation DefaultLoc, 4110 SourceLocation RParenLoc, 4111 bool ContainsUnexpandedParameterPack); 4112 4113 explicit GenericSelectionExpr(EmptyShell Empty) 4114 : Expr(GenericSelectionExprClass, Empty) { } 4115 4116 unsigned getNumAssocs() const { return NumAssocs; } 4117 4118 SourceLocation getGenericLoc() const { return GenericLoc; } 4119 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4120 SourceLocation getRParenLoc() const { return RParenLoc; } 4121 4122 const Expr *getAssocExpr(unsigned i) const { 4123 return cast<Expr>(SubExprs[END_EXPR+i]); 4124 } 4125 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4126 4127 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4128 return AssocTypes[i]; 4129 } 4130 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4131 4132 QualType getAssocType(unsigned i) const { 4133 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4134 return TS->getType(); 4135 else 4136 return QualType(); 4137 } 4138 4139 const Expr *getControllingExpr() const { 4140 return cast<Expr>(SubExprs[CONTROLLING]); 4141 } 4142 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4143 4144 /// Whether this generic selection is result-dependent. 4145 bool isResultDependent() const { return ResultIndex == -1U; } 4146 4147 /// The zero-based index of the result expression's generic association in 4148 /// the generic selection's association list. Defined only if the 4149 /// generic selection is not result-dependent. 4150 unsigned getResultIndex() const { 4151 assert(!isResultDependent() && "Generic selection is result-dependent"); 4152 return ResultIndex; 4153 } 4154 4155 /// The generic selection's result expression. Defined only if the 4156 /// generic selection is not result-dependent. 4157 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4158 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4159 4160 SourceRange getSourceRange() const LLVM_READONLY { 4161 return SourceRange(GenericLoc, RParenLoc); 4162 } 4163 static bool classof(const Stmt *T) { 4164 return T->getStmtClass() == GenericSelectionExprClass; 4165 } 4166 static bool classof(const GenericSelectionExpr *) { return true; } 4167 4168 child_range children() { 4169 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4170 } 4171 4172 friend class ASTStmtReader; 4173}; 4174 4175//===----------------------------------------------------------------------===// 4176// Clang Extensions 4177//===----------------------------------------------------------------------===// 4178 4179 4180/// ExtVectorElementExpr - This represents access to specific elements of a 4181/// vector, and may occur on the left hand side or right hand side. For example 4182/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4183/// 4184/// Note that the base may have either vector or pointer to vector type, just 4185/// like a struct field reference. 4186/// 4187class ExtVectorElementExpr : public Expr { 4188 Stmt *Base; 4189 IdentifierInfo *Accessor; 4190 SourceLocation AccessorLoc; 4191public: 4192 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4193 IdentifierInfo &accessor, SourceLocation loc) 4194 : Expr(ExtVectorElementExprClass, ty, VK, 4195 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4196 base->isTypeDependent(), base->isValueDependent(), 4197 base->isInstantiationDependent(), 4198 base->containsUnexpandedParameterPack()), 4199 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4200 4201 /// \brief Build an empty vector element expression. 4202 explicit ExtVectorElementExpr(EmptyShell Empty) 4203 : Expr(ExtVectorElementExprClass, Empty) { } 4204 4205 const Expr *getBase() const { return cast<Expr>(Base); } 4206 Expr *getBase() { return cast<Expr>(Base); } 4207 void setBase(Expr *E) { Base = E; } 4208 4209 IdentifierInfo &getAccessor() const { return *Accessor; } 4210 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4211 4212 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4213 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4214 4215 /// getNumElements - Get the number of components being selected. 4216 unsigned getNumElements() const; 4217 4218 /// containsDuplicateElements - Return true if any element access is 4219 /// repeated. 4220 bool containsDuplicateElements() const; 4221 4222 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4223 /// aggregate Constant of ConstantInt(s). 4224 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4225 4226 SourceRange getSourceRange() const LLVM_READONLY { 4227 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4228 } 4229 4230 /// isArrow - Return true if the base expression is a pointer to vector, 4231 /// return false if the base expression is a vector. 4232 bool isArrow() const; 4233 4234 static bool classof(const Stmt *T) { 4235 return T->getStmtClass() == ExtVectorElementExprClass; 4236 } 4237 static bool classof(const ExtVectorElementExpr *) { return true; } 4238 4239 // Iterators 4240 child_range children() { return child_range(&Base, &Base+1); } 4241}; 4242 4243 4244/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4245/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4246class BlockExpr : public Expr { 4247protected: 4248 BlockDecl *TheBlock; 4249public: 4250 BlockExpr(BlockDecl *BD, QualType ty) 4251 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4252 ty->isDependentType(), ty->isDependentType(), 4253 ty->isInstantiationDependentType() || BD->isDependentContext(), 4254 false), 4255 TheBlock(BD) {} 4256 4257 /// \brief Build an empty block expression. 4258 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4259 4260 const BlockDecl *getBlockDecl() const { return TheBlock; } 4261 BlockDecl *getBlockDecl() { return TheBlock; } 4262 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4263 4264 // Convenience functions for probing the underlying BlockDecl. 4265 SourceLocation getCaretLocation() const; 4266 const Stmt *getBody() const; 4267 Stmt *getBody(); 4268 4269 SourceRange getSourceRange() const LLVM_READONLY { 4270 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4271 } 4272 4273 /// getFunctionType - Return the underlying function type for this block. 4274 const FunctionProtoType *getFunctionType() const; 4275 4276 static bool classof(const Stmt *T) { 4277 return T->getStmtClass() == BlockExprClass; 4278 } 4279 static bool classof(const BlockExpr *) { return true; } 4280 4281 // Iterators 4282 child_range children() { return child_range(); } 4283}; 4284 4285/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4286/// This AST node provides support for reinterpreting a type to another 4287/// type of the same size. 4288class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4289private: 4290 Stmt *SrcExpr; 4291 SourceLocation BuiltinLoc, RParenLoc; 4292 4293 friend class ASTReader; 4294 friend class ASTStmtReader; 4295 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4296 4297public: 4298 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4299 ExprValueKind VK, ExprObjectKind OK, 4300 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4301 : Expr(AsTypeExprClass, DstType, VK, OK, 4302 DstType->isDependentType(), 4303 DstType->isDependentType() || SrcExpr->isValueDependent(), 4304 (DstType->isInstantiationDependentType() || 4305 SrcExpr->isInstantiationDependent()), 4306 (DstType->containsUnexpandedParameterPack() || 4307 SrcExpr->containsUnexpandedParameterPack())), 4308 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4309 4310 /// getSrcExpr - Return the Expr to be converted. 4311 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4312 4313 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4314 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4315 4316 /// getRParenLoc - Return the location of final right parenthesis. 4317 SourceLocation getRParenLoc() const { return RParenLoc; } 4318 4319 SourceRange getSourceRange() const LLVM_READONLY { 4320 return SourceRange(BuiltinLoc, RParenLoc); 4321 } 4322 4323 static bool classof(const Stmt *T) { 4324 return T->getStmtClass() == AsTypeExprClass; 4325 } 4326 static bool classof(const AsTypeExpr *) { return true; } 4327 4328 // Iterators 4329 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4330}; 4331 4332/// PseudoObjectExpr - An expression which accesses a pseudo-object 4333/// l-value. A pseudo-object is an abstract object, accesses to which 4334/// are translated to calls. The pseudo-object expression has a 4335/// syntactic form, which shows how the expression was actually 4336/// written in the source code, and a semantic form, which is a series 4337/// of expressions to be executed in order which detail how the 4338/// operation is actually evaluated. Optionally, one of the semantic 4339/// forms may also provide a result value for the expression. 4340/// 4341/// If any of the semantic-form expressions is an OpaqueValueExpr, 4342/// that OVE is required to have a source expression, and it is bound 4343/// to the result of that source expression. Such OVEs may appear 4344/// only in subsequent semantic-form expressions and as 4345/// sub-expressions of the syntactic form. 4346/// 4347/// PseudoObjectExpr should be used only when an operation can be 4348/// usefully described in terms of fairly simple rewrite rules on 4349/// objects and functions that are meant to be used by end-developers. 4350/// For example, under the Itanium ABI, dynamic casts are implemented 4351/// as a call to a runtime function called __dynamic_cast; using this 4352/// class to describe that would be inappropriate because that call is 4353/// not really part of the user-visible semantics, and instead the 4354/// cast is properly reflected in the AST and IR-generation has been 4355/// taught to generate the call as necessary. In contrast, an 4356/// Objective-C property access is semantically defined to be 4357/// equivalent to a particular message send, and this is very much 4358/// part of the user model. The name of this class encourages this 4359/// modelling design. 4360class PseudoObjectExpr : public Expr { 4361 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4362 // Always at least two, because the first sub-expression is the 4363 // syntactic form. 4364 4365 // PseudoObjectExprBits.ResultIndex - The index of the 4366 // sub-expression holding the result. 0 means the result is void, 4367 // which is unambiguous because it's the index of the syntactic 4368 // form. Note that this is therefore 1 higher than the value passed 4369 // in to Create, which is an index within the semantic forms. 4370 // Note also that ASTStmtWriter assumes this encoding. 4371 4372 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); } 4373 const Expr * const *getSubExprsBuffer() const { 4374 return reinterpret_cast<const Expr * const *>(this + 1); 4375 } 4376 4377 friend class ASTStmtReader; 4378 4379 PseudoObjectExpr(QualType type, ExprValueKind VK, 4380 Expr *syntactic, ArrayRef<Expr*> semantic, 4381 unsigned resultIndex); 4382 4383 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4384 4385 unsigned getNumSubExprs() const { 4386 return PseudoObjectExprBits.NumSubExprs; 4387 } 4388 4389public: 4390 /// NoResult - A value for the result index indicating that there is 4391 /// no semantic result. 4392 enum { NoResult = ~0U }; 4393 4394 static PseudoObjectExpr *Create(ASTContext &Context, Expr *syntactic, 4395 ArrayRef<Expr*> semantic, 4396 unsigned resultIndex); 4397 4398 static PseudoObjectExpr *Create(ASTContext &Context, EmptyShell shell, 4399 unsigned numSemanticExprs); 4400 4401 /// Return the syntactic form of this expression, i.e. the 4402 /// expression it actually looks like. Likely to be expressed in 4403 /// terms of OpaqueValueExprs bound in the semantic form. 4404 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 4405 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 4406 4407 /// Return the index of the result-bearing expression into the semantics 4408 /// expressions, or PseudoObjectExpr::NoResult if there is none. 4409 unsigned getResultExprIndex() const { 4410 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 4411 return PseudoObjectExprBits.ResultIndex - 1; 4412 } 4413 4414 /// Return the result-bearing expression, or null if there is none. 4415 Expr *getResultExpr() { 4416 if (PseudoObjectExprBits.ResultIndex == 0) 4417 return 0; 4418 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 4419 } 4420 const Expr *getResultExpr() const { 4421 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 4422 } 4423 4424 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 4425 4426 typedef Expr * const *semantics_iterator; 4427 typedef const Expr * const *const_semantics_iterator; 4428 semantics_iterator semantics_begin() { 4429 return getSubExprsBuffer() + 1; 4430 } 4431 const_semantics_iterator semantics_begin() const { 4432 return getSubExprsBuffer() + 1; 4433 } 4434 semantics_iterator semantics_end() { 4435 return getSubExprsBuffer() + getNumSubExprs(); 4436 } 4437 const_semantics_iterator semantics_end() const { 4438 return getSubExprsBuffer() + getNumSubExprs(); 4439 } 4440 Expr *getSemanticExpr(unsigned index) { 4441 assert(index + 1 < getNumSubExprs()); 4442 return getSubExprsBuffer()[index + 1]; 4443 } 4444 const Expr *getSemanticExpr(unsigned index) const { 4445 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 4446 } 4447 4448 SourceLocation getExprLoc() const LLVM_READONLY { 4449 return getSyntacticForm()->getExprLoc(); 4450 } 4451 SourceRange getSourceRange() const LLVM_READONLY { 4452 return getSyntacticForm()->getSourceRange(); 4453 } 4454 4455 child_range children() { 4456 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer()); 4457 return child_range(cs, cs + getNumSubExprs()); 4458 } 4459 4460 static bool classof(const Stmt *T) { 4461 return T->getStmtClass() == PseudoObjectExprClass; 4462 } 4463 static bool classof(const PseudoObjectExpr *) { return true; } 4464}; 4465 4466/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4467/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4468/// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>. 4469/// All of these instructions take one primary pointer and at least one memory 4470/// order. 4471class AtomicExpr : public Expr { 4472public: 4473 enum AtomicOp { 4474#define BUILTIN(ID, TYPE, ATTRS) 4475#define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID, 4476#include "clang/Basic/Builtins.def" 4477 // Avoid trailing comma 4478 BI_First = 0 4479 }; 4480 4481private: 4482 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR }; 4483 Stmt* SubExprs[END_EXPR]; 4484 unsigned NumSubExprs; 4485 SourceLocation BuiltinLoc, RParenLoc; 4486 AtomicOp Op; 4487 4488 friend class ASTStmtReader; 4489 4490public: 4491 AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, QualType t, 4492 AtomicOp op, SourceLocation RP); 4493 4494 /// \brief Determine the number of arguments the specified atomic builtin 4495 /// should have. 4496 static unsigned getNumSubExprs(AtomicOp Op); 4497 4498 /// \brief Build an empty AtomicExpr. 4499 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4500 4501 Expr *getPtr() const { 4502 return cast<Expr>(SubExprs[PTR]); 4503 } 4504 Expr *getOrder() const { 4505 return cast<Expr>(SubExprs[ORDER]); 4506 } 4507 Expr *getVal1() const { 4508 if (Op == AO__c11_atomic_init) 4509 return cast<Expr>(SubExprs[ORDER]); 4510 assert(NumSubExprs > VAL1); 4511 return cast<Expr>(SubExprs[VAL1]); 4512 } 4513 Expr *getOrderFail() const { 4514 assert(NumSubExprs > ORDER_FAIL); 4515 return cast<Expr>(SubExprs[ORDER_FAIL]); 4516 } 4517 Expr *getVal2() const { 4518 if (Op == AO__atomic_exchange) 4519 return cast<Expr>(SubExprs[ORDER_FAIL]); 4520 assert(NumSubExprs > VAL2); 4521 return cast<Expr>(SubExprs[VAL2]); 4522 } 4523 Expr *getWeak() const { 4524 assert(NumSubExprs > WEAK); 4525 return cast<Expr>(SubExprs[WEAK]); 4526 } 4527 4528 AtomicOp getOp() const { return Op; } 4529 unsigned getNumSubExprs() { return NumSubExprs; } 4530 4531 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4532 4533 bool isVolatile() const { 4534 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4535 } 4536 4537 bool isCmpXChg() const { 4538 return getOp() == AO__c11_atomic_compare_exchange_strong || 4539 getOp() == AO__c11_atomic_compare_exchange_weak || 4540 getOp() == AO__atomic_compare_exchange || 4541 getOp() == AO__atomic_compare_exchange_n; 4542 } 4543 4544 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4545 SourceLocation getRParenLoc() const { return RParenLoc; } 4546 4547 SourceRange getSourceRange() const LLVM_READONLY { 4548 return SourceRange(BuiltinLoc, RParenLoc); 4549 } 4550 static bool classof(const Stmt *T) { 4551 return T->getStmtClass() == AtomicExprClass; 4552 } 4553 static bool classof(const AtomicExpr *) { return true; } 4554 4555 // Iterators 4556 child_range children() { 4557 return child_range(SubExprs, SubExprs+NumSubExprs); 4558 } 4559}; 4560} // end namespace clang 4561 4562#endif 4563