Expr.h revision 132283beb1b032e0acd09bdfb45dceadeea0026e
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/Decl.h" 19#include "clang/AST/Stmt.h" 20#include "clang/AST/Type.h" 21#include "clang/AST/DeclAccessPair.h" 22#include "clang/AST/OperationKinds.h" 23#include "clang/AST/ASTVector.h" 24#include "clang/AST/TemplateBase.h" 25#include "clang/Basic/TargetInfo.h" 26#include "clang/Basic/TypeTraits.h" 27#include "llvm/ADT/APSInt.h" 28#include "llvm/ADT/APFloat.h" 29#include "llvm/ADT/SmallVector.h" 30#include "llvm/ADT/StringRef.h" 31#include "llvm/Support/Compiler.h" 32#include <cctype> 33 34namespace clang { 35 class ASTContext; 36 class APValue; 37 class Decl; 38 class IdentifierInfo; 39 class ParmVarDecl; 40 class NamedDecl; 41 class ValueDecl; 42 class BlockDecl; 43 class CXXBaseSpecifier; 44 class CXXOperatorCallExpr; 45 class CXXMemberCallExpr; 46 class ObjCPropertyRefExpr; 47 class OpaqueValueExpr; 48 49/// \brief A simple array of base specifiers. 50typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 51 52/// Expr - This represents one expression. Note that Expr's are subclasses of 53/// Stmt. This allows an expression to be transparently used any place a Stmt 54/// is required. 55/// 56class Expr : public Stmt { 57 QualType TR; 58 59protected: 60 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 61 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 62 : Stmt(SC) 63 { 64 ExprBits.TypeDependent = TD; 65 ExprBits.ValueDependent = VD; 66 ExprBits.InstantiationDependent = ID; 67 ExprBits.ValueKind = VK; 68 ExprBits.ObjectKind = OK; 69 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 70 setType(T); 71 } 72 73 /// \brief Construct an empty expression. 74 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 75 76public: 77 QualType getType() const { return TR; } 78 void setType(QualType t) { 79 // In C++, the type of an expression is always adjusted so that it 80 // will not have reference type an expression will never have 81 // reference type (C++ [expr]p6). Use 82 // QualType::getNonReferenceType() to retrieve the non-reference 83 // type. Additionally, inspect Expr::isLvalue to determine whether 84 // an expression that is adjusted in this manner should be 85 // considered an lvalue. 86 assert((t.isNull() || !t->isReferenceType()) && 87 "Expressions can't have reference type"); 88 89 TR = t; 90 } 91 92 /// isValueDependent - Determines whether this expression is 93 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 94 /// array bound of "Chars" in the following example is 95 /// value-dependent. 96 /// @code 97 /// template<int Size, char (&Chars)[Size]> struct meta_string; 98 /// @endcode 99 bool isValueDependent() const { return ExprBits.ValueDependent; } 100 101 /// \brief Set whether this expression is value-dependent or not. 102 void setValueDependent(bool VD) { 103 ExprBits.ValueDependent = VD; 104 if (VD) 105 ExprBits.InstantiationDependent = true; 106 } 107 108 /// isTypeDependent - Determines whether this expression is 109 /// type-dependent (C++ [temp.dep.expr]), which means that its type 110 /// could change from one template instantiation to the next. For 111 /// example, the expressions "x" and "x + y" are type-dependent in 112 /// the following code, but "y" is not type-dependent: 113 /// @code 114 /// template<typename T> 115 /// void add(T x, int y) { 116 /// x + y; 117 /// } 118 /// @endcode 119 bool isTypeDependent() const { return ExprBits.TypeDependent; } 120 121 /// \brief Set whether this expression is type-dependent or not. 122 void setTypeDependent(bool TD) { 123 ExprBits.TypeDependent = TD; 124 if (TD) 125 ExprBits.InstantiationDependent = true; 126 } 127 128 /// \brief Whether this expression is instantiation-dependent, meaning that 129 /// it depends in some way on a template parameter, even if neither its type 130 /// nor (constant) value can change due to the template instantiation. 131 /// 132 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 133 /// instantiation-dependent (since it involves a template parameter \c T), but 134 /// is neither type- nor value-dependent, since the type of the inner 135 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 136 /// \c sizeof is known. 137 /// 138 /// \code 139 /// template<typename T> 140 /// void f(T x, T y) { 141 /// sizeof(sizeof(T() + T()); 142 /// } 143 /// \endcode 144 /// 145 bool isInstantiationDependent() const { 146 return ExprBits.InstantiationDependent; 147 } 148 149 /// \brief Set whether this expression is instantiation-dependent or not. 150 void setInstantiationDependent(bool ID) { 151 ExprBits.InstantiationDependent = ID; 152 } 153 154 /// \brief Whether this expression contains an unexpanded parameter 155 /// pack (for C++0x variadic templates). 156 /// 157 /// Given the following function template: 158 /// 159 /// \code 160 /// template<typename F, typename ...Types> 161 /// void forward(const F &f, Types &&...args) { 162 /// f(static_cast<Types&&>(args)...); 163 /// } 164 /// \endcode 165 /// 166 /// The expressions \c args and \c static_cast<Types&&>(args) both 167 /// contain parameter packs. 168 bool containsUnexpandedParameterPack() const { 169 return ExprBits.ContainsUnexpandedParameterPack; 170 } 171 172 /// \brief Set the bit that describes whether this expression 173 /// contains an unexpanded parameter pack. 174 void setContainsUnexpandedParameterPack(bool PP = true) { 175 ExprBits.ContainsUnexpandedParameterPack = PP; 176 } 177 178 /// getExprLoc - Return the preferred location for the arrow when diagnosing 179 /// a problem with a generic expression. 180 SourceLocation getExprLoc() const LLVM_READONLY; 181 182 /// isUnusedResultAWarning - Return true if this immediate expression should 183 /// be warned about if the result is unused. If so, fill in expr, location, 184 /// and ranges with expr to warn on and source locations/ranges appropriate 185 /// for a warning. 186 bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc, 187 SourceRange &R1, SourceRange &R2, 188 ASTContext &Ctx) const; 189 190 /// isLValue - True if this expression is an "l-value" according to 191 /// the rules of the current language. C and C++ give somewhat 192 /// different rules for this concept, but in general, the result of 193 /// an l-value expression identifies a specific object whereas the 194 /// result of an r-value expression is a value detached from any 195 /// specific storage. 196 /// 197 /// C++0x divides the concept of "r-value" into pure r-values 198 /// ("pr-values") and so-called expiring values ("x-values"), which 199 /// identify specific objects that can be safely cannibalized for 200 /// their resources. This is an unfortunate abuse of terminology on 201 /// the part of the C++ committee. In Clang, when we say "r-value", 202 /// we generally mean a pr-value. 203 bool isLValue() const { return getValueKind() == VK_LValue; } 204 bool isRValue() const { return getValueKind() == VK_RValue; } 205 bool isXValue() const { return getValueKind() == VK_XValue; } 206 bool isGLValue() const { return getValueKind() != VK_RValue; } 207 208 enum LValueClassification { 209 LV_Valid, 210 LV_NotObjectType, 211 LV_IncompleteVoidType, 212 LV_DuplicateVectorComponents, 213 LV_InvalidExpression, 214 LV_InvalidMessageExpression, 215 LV_MemberFunction, 216 LV_SubObjCPropertySetting, 217 LV_ClassTemporary, 218 LV_ArrayTemporary 219 }; 220 /// Reasons why an expression might not be an l-value. 221 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 222 223 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 224 /// does not have an incomplete type, does not have a const-qualified type, 225 /// and if it is a structure or union, does not have any member (including, 226 /// recursively, any member or element of all contained aggregates or unions) 227 /// with a const-qualified type. 228 /// 229 /// \param Loc [in,out] - A source location which *may* be filled 230 /// in with the location of the expression making this a 231 /// non-modifiable lvalue, if specified. 232 enum isModifiableLvalueResult { 233 MLV_Valid, 234 MLV_NotObjectType, 235 MLV_IncompleteVoidType, 236 MLV_DuplicateVectorComponents, 237 MLV_InvalidExpression, 238 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 239 MLV_IncompleteType, 240 MLV_ConstQualified, 241 MLV_ArrayType, 242 MLV_ReadonlyProperty, 243 MLV_NoSetterProperty, 244 MLV_MemberFunction, 245 MLV_SubObjCPropertySetting, 246 MLV_InvalidMessageExpression, 247 MLV_ClassTemporary, 248 MLV_ArrayTemporary 249 }; 250 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 251 SourceLocation *Loc = 0) const; 252 253 /// \brief The return type of classify(). Represents the C++0x expression 254 /// taxonomy. 255 class Classification { 256 public: 257 /// \brief The various classification results. Most of these mean prvalue. 258 enum Kinds { 259 CL_LValue, 260 CL_XValue, 261 CL_Function, // Functions cannot be lvalues in C. 262 CL_Void, // Void cannot be an lvalue in C. 263 CL_AddressableVoid, // Void expression whose address can be taken in C. 264 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 265 CL_MemberFunction, // An expression referring to a member function 266 CL_SubObjCPropertySetting, 267 CL_ClassTemporary, // A temporary of class type, or subobject thereof. 268 CL_ArrayTemporary, // A temporary of array type. 269 CL_ObjCMessageRValue, // ObjC message is an rvalue 270 CL_PRValue // A prvalue for any other reason, of any other type 271 }; 272 /// \brief The results of modification testing. 273 enum ModifiableType { 274 CM_Untested, // testModifiable was false. 275 CM_Modifiable, 276 CM_RValue, // Not modifiable because it's an rvalue 277 CM_Function, // Not modifiable because it's a function; C++ only 278 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 279 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 280 CM_ConstQualified, 281 CM_ArrayType, 282 CM_IncompleteType 283 }; 284 285 private: 286 friend class Expr; 287 288 unsigned short Kind; 289 unsigned short Modifiable; 290 291 explicit Classification(Kinds k, ModifiableType m) 292 : Kind(k), Modifiable(m) 293 {} 294 295 public: 296 Classification() {} 297 298 Kinds getKind() const { return static_cast<Kinds>(Kind); } 299 ModifiableType getModifiable() const { 300 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 301 return static_cast<ModifiableType>(Modifiable); 302 } 303 bool isLValue() const { return Kind == CL_LValue; } 304 bool isXValue() const { return Kind == CL_XValue; } 305 bool isGLValue() const { return Kind <= CL_XValue; } 306 bool isPRValue() const { return Kind >= CL_Function; } 307 bool isRValue() const { return Kind >= CL_XValue; } 308 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 309 310 /// \brief Create a simple, modifiably lvalue 311 static Classification makeSimpleLValue() { 312 return Classification(CL_LValue, CM_Modifiable); 313 } 314 315 }; 316 /// \brief Classify - Classify this expression according to the C++0x 317 /// expression taxonomy. 318 /// 319 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 320 /// old lvalue vs rvalue. This function determines the type of expression this 321 /// is. There are three expression types: 322 /// - lvalues are classical lvalues as in C++03. 323 /// - prvalues are equivalent to rvalues in C++03. 324 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 325 /// function returning an rvalue reference. 326 /// lvalues and xvalues are collectively referred to as glvalues, while 327 /// prvalues and xvalues together form rvalues. 328 Classification Classify(ASTContext &Ctx) const { 329 return ClassifyImpl(Ctx, 0); 330 } 331 332 /// \brief ClassifyModifiable - Classify this expression according to the 333 /// C++0x expression taxonomy, and see if it is valid on the left side 334 /// of an assignment. 335 /// 336 /// This function extends classify in that it also tests whether the 337 /// expression is modifiable (C99 6.3.2.1p1). 338 /// \param Loc A source location that might be filled with a relevant location 339 /// if the expression is not modifiable. 340 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 341 return ClassifyImpl(Ctx, &Loc); 342 } 343 344 /// getValueKindForType - Given a formal return or parameter type, 345 /// give its value kind. 346 static ExprValueKind getValueKindForType(QualType T) { 347 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 348 return (isa<LValueReferenceType>(RT) 349 ? VK_LValue 350 : (RT->getPointeeType()->isFunctionType() 351 ? VK_LValue : VK_XValue)); 352 return VK_RValue; 353 } 354 355 /// getValueKind - The value kind that this expression produces. 356 ExprValueKind getValueKind() const { 357 return static_cast<ExprValueKind>(ExprBits.ValueKind); 358 } 359 360 /// getObjectKind - The object kind that this expression produces. 361 /// Object kinds are meaningful only for expressions that yield an 362 /// l-value or x-value. 363 ExprObjectKind getObjectKind() const { 364 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 365 } 366 367 bool isOrdinaryOrBitFieldObject() const { 368 ExprObjectKind OK = getObjectKind(); 369 return (OK == OK_Ordinary || OK == OK_BitField); 370 } 371 372 /// setValueKind - Set the value kind produced by this expression. 373 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 374 375 /// setObjectKind - Set the object kind produced by this expression. 376 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 377 378private: 379 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 380 381public: 382 383 /// \brief If this expression refers to a bit-field, retrieve the 384 /// declaration of that bit-field. 385 FieldDecl *getBitField(); 386 387 const FieldDecl *getBitField() const { 388 return const_cast<Expr*>(this)->getBitField(); 389 } 390 391 /// \brief If this expression is an l-value for an Objective C 392 /// property, find the underlying property reference expression. 393 const ObjCPropertyRefExpr *getObjCProperty() const; 394 395 /// \brief Returns whether this expression refers to a vector element. 396 bool refersToVectorElement() const; 397 398 /// \brief Returns whether this expression has a placeholder type. 399 bool hasPlaceholderType() const { 400 return getType()->isPlaceholderType(); 401 } 402 403 /// \brief Returns whether this expression has a specific placeholder type. 404 bool hasPlaceholderType(BuiltinType::Kind K) const { 405 assert(BuiltinType::isPlaceholderTypeKind(K)); 406 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 407 return BT->getKind() == K; 408 return false; 409 } 410 411 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 412 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 413 /// but also int expressions which are produced by things like comparisons in 414 /// C. 415 bool isKnownToHaveBooleanValue() const; 416 417 /// isIntegerConstantExpr - Return true if this expression is a valid integer 418 /// constant expression, and, if so, return its value in Result. If not a 419 /// valid i-c-e, return false and fill in Loc (if specified) with the location 420 /// of the invalid expression. 421 /// 422 /// Note: This does not perform the implicit conversions required by C++11 423 /// [expr.const]p5. 424 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 425 SourceLocation *Loc = 0, 426 bool isEvaluated = true) const; 427 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const; 428 429 /// isCXX98IntegralConstantExpr - Return true if this expression is an 430 /// integral constant expression in C++98. Can only be used in C++. 431 bool isCXX98IntegralConstantExpr(ASTContext &Ctx) const; 432 433 /// isCXX11ConstantExpr - Return true if this expression is a constant 434 /// expression in C++11. Can only be used in C++. 435 /// 436 /// Note: This does not perform the implicit conversions required by C++11 437 /// [expr.const]p5. 438 bool isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result = 0, 439 SourceLocation *Loc = 0) const; 440 441 /// isPotentialConstantExpr - Return true if this function's definition 442 /// might be usable in a constant expression in C++11, if it were marked 443 /// constexpr. Return false if the function can never produce a constant 444 /// expression, along with diagnostics describing why not. 445 static bool isPotentialConstantExpr(const FunctionDecl *FD, 446 llvm::SmallVectorImpl< 447 PartialDiagnosticAt> &Diags); 448 449 /// isConstantInitializer - Returns true if this expression can be emitted to 450 /// IR as a constant, and thus can be used as a constant initializer in C. 451 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 452 453 /// EvalStatus is a struct with detailed info about an evaluation in progress. 454 struct EvalStatus { 455 /// HasSideEffects - Whether the evaluated expression has side effects. 456 /// For example, (f() && 0) can be folded, but it still has side effects. 457 bool HasSideEffects; 458 459 /// Diag - If this is non-null, it will be filled in with a stack of notes 460 /// indicating why evaluation failed (or why it failed to produce a constant 461 /// expression). 462 /// If the expression is unfoldable, the notes will indicate why it's not 463 /// foldable. If the expression is foldable, but not a constant expression, 464 /// the notes will describes why it isn't a constant expression. If the 465 /// expression *is* a constant expression, no notes will be produced. 466 llvm::SmallVectorImpl<PartialDiagnosticAt> *Diag; 467 468 EvalStatus() : HasSideEffects(false), Diag(0) {} 469 470 // hasSideEffects - Return true if the evaluated expression has 471 // side effects. 472 bool hasSideEffects() const { 473 return HasSideEffects; 474 } 475 }; 476 477 /// EvalResult is a struct with detailed info about an evaluated expression. 478 struct EvalResult : EvalStatus { 479 /// Val - This is the value the expression can be folded to. 480 APValue Val; 481 482 // isGlobalLValue - Return true if the evaluated lvalue expression 483 // is global. 484 bool isGlobalLValue() const; 485 }; 486 487 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 488 /// an rvalue using any crazy technique (that has nothing to do with language 489 /// standards) that we want to, even if the expression has side-effects. If 490 /// this function returns true, it returns the folded constant in Result. If 491 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 492 /// applied. 493 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 494 495 /// EvaluateAsBooleanCondition - Return true if this is a constant 496 /// which we we can fold and convert to a boolean condition using 497 /// any crazy technique that we want to, even if the expression has 498 /// side-effects. 499 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 500 501 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects }; 502 503 /// EvaluateAsInt - Return true if this is a constant which we can fold and 504 /// convert to an integer, using any crazy technique that we want to. 505 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 506 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 507 508 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 509 /// constant folded without side-effects, but discard the result. 510 bool isEvaluatable(const ASTContext &Ctx) const; 511 512 /// HasSideEffects - This routine returns true for all those expressions 513 /// which must be evaluated each time and must not be optimized away 514 /// or evaluated at compile time. Example is a function call, volatile 515 /// variable read. 516 bool HasSideEffects(const ASTContext &Ctx) const; 517 518 /// \brief Determine whether this expression involves a call to any function 519 /// that is not trivial. 520 bool hasNonTrivialCall(ASTContext &Ctx); 521 522 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 523 /// integer. This must be called on an expression that constant folds to an 524 /// integer. 525 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 526 527 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 528 /// lvalue with link time known address, with no side-effects. 529 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 530 531 /// EvaluateAsInitializer - Evaluate an expression as if it were the 532 /// initializer of the given declaration. Returns true if the initializer 533 /// can be folded to a constant, and produces any relevant notes. In C++11, 534 /// notes will be produced if the expression is not a constant expression. 535 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 536 const VarDecl *VD, 537 llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 538 539 /// \brief Enumeration used to describe the kind of Null pointer constant 540 /// returned from \c isNullPointerConstant(). 541 enum NullPointerConstantKind { 542 /// \brief Expression is not a Null pointer constant. 543 NPCK_NotNull = 0, 544 545 /// \brief Expression is a Null pointer constant built from a zero integer. 546 NPCK_ZeroInteger, 547 548 /// \brief Expression is a C++0X nullptr. 549 NPCK_CXX0X_nullptr, 550 551 /// \brief Expression is a GNU-style __null constant. 552 NPCK_GNUNull 553 }; 554 555 /// \brief Enumeration used to describe how \c isNullPointerConstant() 556 /// should cope with value-dependent expressions. 557 enum NullPointerConstantValueDependence { 558 /// \brief Specifies that the expression should never be value-dependent. 559 NPC_NeverValueDependent = 0, 560 561 /// \brief Specifies that a value-dependent expression of integral or 562 /// dependent type should be considered a null pointer constant. 563 NPC_ValueDependentIsNull, 564 565 /// \brief Specifies that a value-dependent expression should be considered 566 /// to never be a null pointer constant. 567 NPC_ValueDependentIsNotNull 568 }; 569 570 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 571 /// a Null pointer constant. The return value can further distinguish the 572 /// kind of NULL pointer constant that was detected. 573 NullPointerConstantKind isNullPointerConstant( 574 ASTContext &Ctx, 575 NullPointerConstantValueDependence NPC) const; 576 577 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 578 /// write barrier. 579 bool isOBJCGCCandidate(ASTContext &Ctx) const; 580 581 /// \brief Returns true if this expression is a bound member function. 582 bool isBoundMemberFunction(ASTContext &Ctx) const; 583 584 /// \brief Given an expression of bound-member type, find the type 585 /// of the member. Returns null if this is an *overloaded* bound 586 /// member expression. 587 static QualType findBoundMemberType(const Expr *expr); 588 589 /// IgnoreImpCasts - Skip past any implicit casts which might 590 /// surround this expression. Only skips ImplicitCastExprs. 591 Expr *IgnoreImpCasts() LLVM_READONLY; 592 593 /// IgnoreImplicit - Skip past any implicit AST nodes which might 594 /// surround this expression. 595 Expr *IgnoreImplicit() LLVM_READONLY { 596 return cast<Expr>(Stmt::IgnoreImplicit()); 597 } 598 599 const Expr *IgnoreImplicit() const LLVM_READONLY { 600 return const_cast<Expr*>(this)->IgnoreImplicit(); 601 } 602 603 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 604 /// its subexpression. If that subexpression is also a ParenExpr, 605 /// then this method recursively returns its subexpression, and so forth. 606 /// Otherwise, the method returns the current Expr. 607 Expr *IgnoreParens() LLVM_READONLY; 608 609 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 610 /// or CastExprs, returning their operand. 611 Expr *IgnoreParenCasts() LLVM_READONLY; 612 613 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 614 /// any ParenExpr or ImplicitCastExprs, returning their operand. 615 Expr *IgnoreParenImpCasts() LLVM_READONLY; 616 617 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 618 /// call to a conversion operator, return the argument. 619 Expr *IgnoreConversionOperator() LLVM_READONLY; 620 621 const Expr *IgnoreConversionOperator() const LLVM_READONLY { 622 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 623 } 624 625 const Expr *IgnoreParenImpCasts() const LLVM_READONLY { 626 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 627 } 628 629 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 630 /// CastExprs that represent lvalue casts, returning their operand. 631 Expr *IgnoreParenLValueCasts() LLVM_READONLY; 632 633 const Expr *IgnoreParenLValueCasts() const LLVM_READONLY { 634 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 635 } 636 637 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 638 /// value (including ptr->int casts of the same size). Strip off any 639 /// ParenExpr or CastExprs, returning their operand. 640 Expr *IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY; 641 642 /// Ignore parentheses and derived-to-base casts. 643 Expr *ignoreParenBaseCasts() LLVM_READONLY; 644 645 const Expr *ignoreParenBaseCasts() const LLVM_READONLY { 646 return const_cast<Expr*>(this)->ignoreParenBaseCasts(); 647 } 648 649 /// \brief Determine whether this expression is a default function argument. 650 /// 651 /// Default arguments are implicitly generated in the abstract syntax tree 652 /// by semantic analysis for function calls, object constructions, etc. in 653 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 654 /// this routine also looks through any implicit casts to determine whether 655 /// the expression is a default argument. 656 bool isDefaultArgument() const; 657 658 /// \brief Determine whether the result of this expression is a 659 /// temporary object of the given class type. 660 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 661 662 /// \brief Whether this expression is an implicit reference to 'this' in C++. 663 bool isImplicitCXXThis() const; 664 665 const Expr *IgnoreImpCasts() const LLVM_READONLY { 666 return const_cast<Expr*>(this)->IgnoreImpCasts(); 667 } 668 const Expr *IgnoreParens() const LLVM_READONLY { 669 return const_cast<Expr*>(this)->IgnoreParens(); 670 } 671 const Expr *IgnoreParenCasts() const LLVM_READONLY { 672 return const_cast<Expr*>(this)->IgnoreParenCasts(); 673 } 674 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const LLVM_READONLY { 675 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 676 } 677 678 static bool hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs); 679 680 /// \brief For an expression of class type or pointer to class type, 681 /// return the most derived class decl the expression is known to refer to. 682 /// 683 /// If this expression is a cast, this method looks through it to find the 684 /// most derived decl that can be inferred from the expression. 685 /// This is valid because derived-to-base conversions have undefined 686 /// behavior if the object isn't dynamically of the derived type. 687 const CXXRecordDecl *getBestDynamicClassType() const; 688 689 static bool classof(const Stmt *T) { 690 return T->getStmtClass() >= firstExprConstant && 691 T->getStmtClass() <= lastExprConstant; 692 } 693 static bool classof(const Expr *) { return true; } 694}; 695 696 697//===----------------------------------------------------------------------===// 698// Primary Expressions. 699//===----------------------------------------------------------------------===// 700 701/// OpaqueValueExpr - An expression referring to an opaque object of a 702/// fixed type and value class. These don't correspond to concrete 703/// syntax; instead they're used to express operations (usually copy 704/// operations) on values whose source is generally obvious from 705/// context. 706class OpaqueValueExpr : public Expr { 707 friend class ASTStmtReader; 708 Expr *SourceExpr; 709 SourceLocation Loc; 710 711public: 712 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 713 ExprObjectKind OK = OK_Ordinary, 714 Expr *SourceExpr = 0) 715 : Expr(OpaqueValueExprClass, T, VK, OK, 716 T->isDependentType(), 717 T->isDependentType() || 718 (SourceExpr && SourceExpr->isValueDependent()), 719 T->isInstantiationDependentType(), 720 false), 721 SourceExpr(SourceExpr), Loc(Loc) { 722 } 723 724 /// Given an expression which invokes a copy constructor --- i.e. a 725 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 726 /// find the OpaqueValueExpr that's the source of the construction. 727 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 728 729 explicit OpaqueValueExpr(EmptyShell Empty) 730 : Expr(OpaqueValueExprClass, Empty) { } 731 732 /// \brief Retrieve the location of this expression. 733 SourceLocation getLocation() const { return Loc; } 734 735 SourceRange getSourceRange() const LLVM_READONLY { 736 if (SourceExpr) return SourceExpr->getSourceRange(); 737 return Loc; 738 } 739 SourceLocation getExprLoc() const LLVM_READONLY { 740 if (SourceExpr) return SourceExpr->getExprLoc(); 741 return Loc; 742 } 743 744 child_range children() { return child_range(); } 745 746 /// The source expression of an opaque value expression is the 747 /// expression which originally generated the value. This is 748 /// provided as a convenience for analyses that don't wish to 749 /// precisely model the execution behavior of the program. 750 /// 751 /// The source expression is typically set when building the 752 /// expression which binds the opaque value expression in the first 753 /// place. 754 Expr *getSourceExpr() const { return SourceExpr; } 755 756 static bool classof(const Stmt *T) { 757 return T->getStmtClass() == OpaqueValueExprClass; 758 } 759 static bool classof(const OpaqueValueExpr *) { return true; } 760}; 761 762/// \brief A reference to a declared variable, function, enum, etc. 763/// [C99 6.5.1p2] 764/// 765/// This encodes all the information about how a declaration is referenced 766/// within an expression. 767/// 768/// There are several optional constructs attached to DeclRefExprs only when 769/// they apply in order to conserve memory. These are laid out past the end of 770/// the object, and flags in the DeclRefExprBitfield track whether they exist: 771/// 772/// DeclRefExprBits.HasQualifier: 773/// Specifies when this declaration reference expression has a C++ 774/// nested-name-specifier. 775/// DeclRefExprBits.HasFoundDecl: 776/// Specifies when this declaration reference expression has a record of 777/// a NamedDecl (different from the referenced ValueDecl) which was found 778/// during name lookup and/or overload resolution. 779/// DeclRefExprBits.HasTemplateKWAndArgsInfo: 780/// Specifies when this declaration reference expression has an explicit 781/// C++ template keyword and/or template argument list. 782/// DeclRefExprBits.RefersToEnclosingLocal 783/// Specifies when this declaration reference expression (validly) 784/// refers to a local variable from a different function. 785class DeclRefExpr : public Expr { 786 /// \brief The declaration that we are referencing. 787 ValueDecl *D; 788 789 /// \brief The location of the declaration name itself. 790 SourceLocation Loc; 791 792 /// \brief Provides source/type location info for the declaration name 793 /// embedded in D. 794 DeclarationNameLoc DNLoc; 795 796 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 797 NestedNameSpecifierLoc &getInternalQualifierLoc() { 798 assert(hasQualifier()); 799 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 800 } 801 802 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 803 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 804 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 805 } 806 807 /// \brief Test whether there is a distinct FoundDecl attached to the end of 808 /// this DRE. 809 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 810 811 /// \brief Helper to retrieve the optional NamedDecl through which this 812 /// reference occured. 813 NamedDecl *&getInternalFoundDecl() { 814 assert(hasFoundDecl()); 815 if (hasQualifier()) 816 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 817 return *reinterpret_cast<NamedDecl **>(this + 1); 818 } 819 820 /// \brief Helper to retrieve the optional NamedDecl through which this 821 /// reference occured. 822 NamedDecl *getInternalFoundDecl() const { 823 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 824 } 825 826 DeclRefExpr(ASTContext &Ctx, 827 NestedNameSpecifierLoc QualifierLoc, 828 SourceLocation TemplateKWLoc, 829 ValueDecl *D, bool refersToEnclosingLocal, 830 const DeclarationNameInfo &NameInfo, 831 NamedDecl *FoundD, 832 const TemplateArgumentListInfo *TemplateArgs, 833 QualType T, ExprValueKind VK); 834 835 /// \brief Construct an empty declaration reference expression. 836 explicit DeclRefExpr(EmptyShell Empty) 837 : Expr(DeclRefExprClass, Empty) { } 838 839 /// \brief Computes the type- and value-dependence flags for this 840 /// declaration reference expression. 841 void computeDependence(ASTContext &C); 842 843public: 844 DeclRefExpr(ValueDecl *D, bool refersToEnclosingLocal, QualType T, 845 ExprValueKind VK, SourceLocation L, 846 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 847 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 848 D(D), Loc(L), DNLoc(LocInfo) { 849 DeclRefExprBits.HasQualifier = 0; 850 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 851 DeclRefExprBits.HasFoundDecl = 0; 852 DeclRefExprBits.HadMultipleCandidates = 0; 853 DeclRefExprBits.RefersToEnclosingLocal = refersToEnclosingLocal; 854 computeDependence(D->getASTContext()); 855 } 856 857 static DeclRefExpr *Create(ASTContext &Context, 858 NestedNameSpecifierLoc QualifierLoc, 859 SourceLocation TemplateKWLoc, 860 ValueDecl *D, 861 bool isEnclosingLocal, 862 SourceLocation NameLoc, 863 QualType T, ExprValueKind VK, 864 NamedDecl *FoundD = 0, 865 const TemplateArgumentListInfo *TemplateArgs = 0); 866 867 static DeclRefExpr *Create(ASTContext &Context, 868 NestedNameSpecifierLoc QualifierLoc, 869 SourceLocation TemplateKWLoc, 870 ValueDecl *D, 871 bool isEnclosingLocal, 872 const DeclarationNameInfo &NameInfo, 873 QualType T, ExprValueKind VK, 874 NamedDecl *FoundD = 0, 875 const TemplateArgumentListInfo *TemplateArgs = 0); 876 877 /// \brief Construct an empty declaration reference expression. 878 static DeclRefExpr *CreateEmpty(ASTContext &Context, 879 bool HasQualifier, 880 bool HasFoundDecl, 881 bool HasTemplateKWAndArgsInfo, 882 unsigned NumTemplateArgs); 883 884 ValueDecl *getDecl() { return D; } 885 const ValueDecl *getDecl() const { return D; } 886 void setDecl(ValueDecl *NewD) { D = NewD; } 887 888 DeclarationNameInfo getNameInfo() const { 889 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 890 } 891 892 SourceLocation getLocation() const { return Loc; } 893 void setLocation(SourceLocation L) { Loc = L; } 894 SourceRange getSourceRange() const LLVM_READONLY; 895 SourceLocation getLocStart() const LLVM_READONLY; 896 SourceLocation getLocEnd() const LLVM_READONLY; 897 898 /// \brief Determine whether this declaration reference was preceded by a 899 /// C++ nested-name-specifier, e.g., \c N::foo. 900 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 901 902 /// \brief If the name was qualified, retrieves the nested-name-specifier 903 /// that precedes the name. Otherwise, returns NULL. 904 NestedNameSpecifier *getQualifier() const { 905 if (!hasQualifier()) 906 return 0; 907 908 return getInternalQualifierLoc().getNestedNameSpecifier(); 909 } 910 911 /// \brief If the name was qualified, retrieves the nested-name-specifier 912 /// that precedes the name, with source-location information. 913 NestedNameSpecifierLoc getQualifierLoc() const { 914 if (!hasQualifier()) 915 return NestedNameSpecifierLoc(); 916 917 return getInternalQualifierLoc(); 918 } 919 920 /// \brief Get the NamedDecl through which this reference occured. 921 /// 922 /// This Decl may be different from the ValueDecl actually referred to in the 923 /// presence of using declarations, etc. It always returns non-NULL, and may 924 /// simple return the ValueDecl when appropriate. 925 NamedDecl *getFoundDecl() { 926 return hasFoundDecl() ? getInternalFoundDecl() : D; 927 } 928 929 /// \brief Get the NamedDecl through which this reference occurred. 930 /// See non-const variant. 931 const NamedDecl *getFoundDecl() const { 932 return hasFoundDecl() ? getInternalFoundDecl() : D; 933 } 934 935 bool hasTemplateKWAndArgsInfo() const { 936 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 937 } 938 939 /// \brief Return the optional template keyword and arguments info. 940 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 941 if (!hasTemplateKWAndArgsInfo()) 942 return 0; 943 944 if (hasFoundDecl()) 945 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 946 &getInternalFoundDecl() + 1); 947 948 if (hasQualifier()) 949 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 950 &getInternalQualifierLoc() + 1); 951 952 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 953 } 954 955 /// \brief Return the optional template keyword and arguments info. 956 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 957 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo(); 958 } 959 960 /// \brief Retrieve the location of the template keyword preceding 961 /// this name, if any. 962 SourceLocation getTemplateKeywordLoc() const { 963 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 964 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 965 } 966 967 /// \brief Retrieve the location of the left angle bracket starting the 968 /// explicit template argument list following the name, if any. 969 SourceLocation getLAngleLoc() const { 970 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 971 return getTemplateKWAndArgsInfo()->LAngleLoc; 972 } 973 974 /// \brief Retrieve the location of the right angle bracket ending the 975 /// explicit template argument list following the name, if any. 976 SourceLocation getRAngleLoc() const { 977 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 978 return getTemplateKWAndArgsInfo()->RAngleLoc; 979 } 980 981 /// \brief Determines whether the name in this declaration reference 982 /// was preceded by the template keyword. 983 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 984 985 /// \brief Determines whether this declaration reference was followed by an 986 /// explicit template argument list. 987 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 988 989 /// \brief Retrieve the explicit template argument list that followed the 990 /// member template name. 991 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 992 assert(hasExplicitTemplateArgs()); 993 return *getTemplateKWAndArgsInfo(); 994 } 995 996 /// \brief Retrieve the explicit template argument list that followed the 997 /// member template name. 998 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 999 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 1000 } 1001 1002 /// \brief Retrieves the optional explicit template arguments. 1003 /// This points to the same data as getExplicitTemplateArgs(), but 1004 /// returns null if there are no explicit template arguments. 1005 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 1006 if (!hasExplicitTemplateArgs()) return 0; 1007 return &getExplicitTemplateArgs(); 1008 } 1009 1010 /// \brief Copies the template arguments (if present) into the given 1011 /// structure. 1012 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1013 if (hasExplicitTemplateArgs()) 1014 getExplicitTemplateArgs().copyInto(List); 1015 } 1016 1017 /// \brief Retrieve the template arguments provided as part of this 1018 /// template-id. 1019 const TemplateArgumentLoc *getTemplateArgs() const { 1020 if (!hasExplicitTemplateArgs()) 1021 return 0; 1022 1023 return getExplicitTemplateArgs().getTemplateArgs(); 1024 } 1025 1026 /// \brief Retrieve the number of template arguments provided as part of this 1027 /// template-id. 1028 unsigned getNumTemplateArgs() const { 1029 if (!hasExplicitTemplateArgs()) 1030 return 0; 1031 1032 return getExplicitTemplateArgs().NumTemplateArgs; 1033 } 1034 1035 /// \brief Returns true if this expression refers to a function that 1036 /// was resolved from an overloaded set having size greater than 1. 1037 bool hadMultipleCandidates() const { 1038 return DeclRefExprBits.HadMultipleCandidates; 1039 } 1040 /// \brief Sets the flag telling whether this expression refers to 1041 /// a function that was resolved from an overloaded set having size 1042 /// greater than 1. 1043 void setHadMultipleCandidates(bool V = true) { 1044 DeclRefExprBits.HadMultipleCandidates = V; 1045 } 1046 1047 /// Does this DeclRefExpr refer to a local declaration from an 1048 /// enclosing function scope? 1049 bool refersToEnclosingLocal() const { 1050 return DeclRefExprBits.RefersToEnclosingLocal; 1051 } 1052 1053 static bool classof(const Stmt *T) { 1054 return T->getStmtClass() == DeclRefExprClass; 1055 } 1056 static bool classof(const DeclRefExpr *) { return true; } 1057 1058 // Iterators 1059 child_range children() { return child_range(); } 1060 1061 friend class ASTStmtReader; 1062 friend class ASTStmtWriter; 1063}; 1064 1065/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 1066class PredefinedExpr : public Expr { 1067public: 1068 enum IdentType { 1069 Func, 1070 Function, 1071 LFunction, // Same as Function, but as wide string. 1072 PrettyFunction, 1073 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 1074 /// 'virtual' keyword is omitted for virtual member functions. 1075 PrettyFunctionNoVirtual 1076 }; 1077 1078private: 1079 SourceLocation Loc; 1080 IdentType Type; 1081public: 1082 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 1083 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 1084 type->isDependentType(), type->isDependentType(), 1085 type->isInstantiationDependentType(), 1086 /*ContainsUnexpandedParameterPack=*/false), 1087 Loc(l), Type(IT) {} 1088 1089 /// \brief Construct an empty predefined expression. 1090 explicit PredefinedExpr(EmptyShell Empty) 1091 : Expr(PredefinedExprClass, Empty) { } 1092 1093 IdentType getIdentType() const { return Type; } 1094 void setIdentType(IdentType IT) { Type = IT; } 1095 1096 SourceLocation getLocation() const { return Loc; } 1097 void setLocation(SourceLocation L) { Loc = L; } 1098 1099 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1100 1101 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1102 1103 static bool classof(const Stmt *T) { 1104 return T->getStmtClass() == PredefinedExprClass; 1105 } 1106 static bool classof(const PredefinedExpr *) { return true; } 1107 1108 // Iterators 1109 child_range children() { return child_range(); } 1110}; 1111 1112/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1113/// leaking memory. 1114/// 1115/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1116/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1117/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1118/// the APFloat/APInt values will never get freed. APNumericStorage uses 1119/// ASTContext's allocator for memory allocation. 1120class APNumericStorage { 1121 union { 1122 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1123 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1124 }; 1125 unsigned BitWidth; 1126 1127 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1128 1129 APNumericStorage(const APNumericStorage&); // do not implement 1130 APNumericStorage& operator=(const APNumericStorage&); // do not implement 1131 1132protected: 1133 APNumericStorage() : VAL(0), BitWidth(0) { } 1134 1135 llvm::APInt getIntValue() const { 1136 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1137 if (NumWords > 1) 1138 return llvm::APInt(BitWidth, NumWords, pVal); 1139 else 1140 return llvm::APInt(BitWidth, VAL); 1141 } 1142 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1143}; 1144 1145class APIntStorage : private APNumericStorage { 1146public: 1147 llvm::APInt getValue() const { return getIntValue(); } 1148 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1149}; 1150 1151class APFloatStorage : private APNumericStorage { 1152public: 1153 llvm::APFloat getValue(bool IsIEEE) const { 1154 return llvm::APFloat(getIntValue(), IsIEEE); 1155 } 1156 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1157 setIntValue(C, Val.bitcastToAPInt()); 1158 } 1159}; 1160 1161class IntegerLiteral : public Expr, public APIntStorage { 1162 SourceLocation Loc; 1163 1164 /// \brief Construct an empty integer literal. 1165 explicit IntegerLiteral(EmptyShell Empty) 1166 : Expr(IntegerLiteralClass, Empty) { } 1167 1168public: 1169 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1170 // or UnsignedLongLongTy 1171 IntegerLiteral(ASTContext &C, const llvm::APInt &V, QualType type, 1172 SourceLocation l); 1173 1174 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1175 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1176 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1177 /// \param V - the value that the returned integer literal contains. 1178 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1179 QualType type, SourceLocation l); 1180 /// \brief Returns a new empty integer literal. 1181 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1182 1183 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1184 1185 /// \brief Retrieve the location of the literal. 1186 SourceLocation getLocation() const { return Loc; } 1187 1188 void setLocation(SourceLocation Location) { Loc = Location; } 1189 1190 static bool classof(const Stmt *T) { 1191 return T->getStmtClass() == IntegerLiteralClass; 1192 } 1193 static bool classof(const IntegerLiteral *) { return true; } 1194 1195 // Iterators 1196 child_range children() { return child_range(); } 1197}; 1198 1199class CharacterLiteral : public Expr { 1200public: 1201 enum CharacterKind { 1202 Ascii, 1203 Wide, 1204 UTF16, 1205 UTF32 1206 }; 1207 1208private: 1209 unsigned Value; 1210 SourceLocation Loc; 1211public: 1212 // type should be IntTy 1213 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1214 SourceLocation l) 1215 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1216 false, false), 1217 Value(value), Loc(l) { 1218 CharacterLiteralBits.Kind = kind; 1219 } 1220 1221 /// \brief Construct an empty character literal. 1222 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1223 1224 SourceLocation getLocation() const { return Loc; } 1225 CharacterKind getKind() const { 1226 return static_cast<CharacterKind>(CharacterLiteralBits.Kind); 1227 } 1228 1229 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1230 1231 unsigned getValue() const { return Value; } 1232 1233 void setLocation(SourceLocation Location) { Loc = Location; } 1234 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; } 1235 void setValue(unsigned Val) { Value = Val; } 1236 1237 static bool classof(const Stmt *T) { 1238 return T->getStmtClass() == CharacterLiteralClass; 1239 } 1240 static bool classof(const CharacterLiteral *) { return true; } 1241 1242 // Iterators 1243 child_range children() { return child_range(); } 1244}; 1245 1246class FloatingLiteral : public Expr, private APFloatStorage { 1247 SourceLocation Loc; 1248 1249 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1250 QualType Type, SourceLocation L); 1251 1252 /// \brief Construct an empty floating-point literal. 1253 explicit FloatingLiteral(ASTContext &C, EmptyShell Empty); 1254 1255public: 1256 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1257 bool isexact, QualType Type, SourceLocation L); 1258 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1259 1260 llvm::APFloat getValue() const { 1261 return APFloatStorage::getValue(FloatingLiteralBits.IsIEEE); 1262 } 1263 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1264 APFloatStorage::setValue(C, Val); 1265 } 1266 1267 bool isExact() const { return FloatingLiteralBits.IsExact; } 1268 void setExact(bool E) { FloatingLiteralBits.IsExact = E; } 1269 1270 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1271 /// double. Note that this may cause loss of precision, but is useful for 1272 /// debugging dumps, etc. 1273 double getValueAsApproximateDouble() const; 1274 1275 SourceLocation getLocation() const { return Loc; } 1276 void setLocation(SourceLocation L) { Loc = L; } 1277 1278 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1279 1280 static bool classof(const Stmt *T) { 1281 return T->getStmtClass() == FloatingLiteralClass; 1282 } 1283 static bool classof(const FloatingLiteral *) { return true; } 1284 1285 // Iterators 1286 child_range children() { return child_range(); } 1287}; 1288 1289/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1290/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1291/// IntegerLiteral classes. Instances of this class always have a Complex type 1292/// whose element type matches the subexpression. 1293/// 1294class ImaginaryLiteral : public Expr { 1295 Stmt *Val; 1296public: 1297 ImaginaryLiteral(Expr *val, QualType Ty) 1298 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1299 false, false), 1300 Val(val) {} 1301 1302 /// \brief Build an empty imaginary literal. 1303 explicit ImaginaryLiteral(EmptyShell Empty) 1304 : Expr(ImaginaryLiteralClass, Empty) { } 1305 1306 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1307 Expr *getSubExpr() { return cast<Expr>(Val); } 1308 void setSubExpr(Expr *E) { Val = E; } 1309 1310 SourceRange getSourceRange() const LLVM_READONLY { return Val->getSourceRange(); } 1311 static bool classof(const Stmt *T) { 1312 return T->getStmtClass() == ImaginaryLiteralClass; 1313 } 1314 static bool classof(const ImaginaryLiteral *) { return true; } 1315 1316 // Iterators 1317 child_range children() { return child_range(&Val, &Val+1); } 1318}; 1319 1320/// StringLiteral - This represents a string literal expression, e.g. "foo" 1321/// or L"bar" (wide strings). The actual string is returned by getStrData() 1322/// is NOT null-terminated, and the length of the string is determined by 1323/// calling getByteLength(). The C type for a string is always a 1324/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1325/// not. 1326/// 1327/// Note that strings in C can be formed by concatenation of multiple string 1328/// literal pptokens in translation phase #6. This keeps track of the locations 1329/// of each of these pieces. 1330/// 1331/// Strings in C can also be truncated and extended by assigning into arrays, 1332/// e.g. with constructs like: 1333/// char X[2] = "foobar"; 1334/// In this case, getByteLength() will return 6, but the string literal will 1335/// have type "char[2]". 1336class StringLiteral : public Expr { 1337public: 1338 enum StringKind { 1339 Ascii, 1340 Wide, 1341 UTF8, 1342 UTF16, 1343 UTF32 1344 }; 1345 1346private: 1347 friend class ASTStmtReader; 1348 1349 union { 1350 const char *asChar; 1351 const uint16_t *asUInt16; 1352 const uint32_t *asUInt32; 1353 } StrData; 1354 unsigned Length; 1355 unsigned CharByteWidth : 4; 1356 unsigned Kind : 3; 1357 unsigned IsPascal : 1; 1358 unsigned NumConcatenated; 1359 SourceLocation TokLocs[1]; 1360 1361 StringLiteral(QualType Ty) : 1362 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1363 false) {} 1364 1365 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1366 1367public: 1368 /// This is the "fully general" constructor that allows representation of 1369 /// strings formed from multiple concatenated tokens. 1370 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1371 bool Pascal, QualType Ty, 1372 const SourceLocation *Loc, unsigned NumStrs); 1373 1374 /// Simple constructor for string literals made from one token. 1375 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1376 bool Pascal, QualType Ty, 1377 SourceLocation Loc) { 1378 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1379 } 1380 1381 /// \brief Construct an empty string literal. 1382 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1383 1384 StringRef getString() const { 1385 assert(CharByteWidth==1 1386 && "This function is used in places that assume strings use char"); 1387 return StringRef(StrData.asChar, getByteLength()); 1388 } 1389 1390 /// Allow access to clients that need the byte representation, such as 1391 /// ASTWriterStmt::VisitStringLiteral(). 1392 StringRef getBytes() const { 1393 // FIXME: StringRef may not be the right type to use as a result for this. 1394 if (CharByteWidth == 1) 1395 return StringRef(StrData.asChar, getByteLength()); 1396 if (CharByteWidth == 4) 1397 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1398 getByteLength()); 1399 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1400 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1401 getByteLength()); 1402 } 1403 1404 void outputString(raw_ostream &OS); 1405 1406 uint32_t getCodeUnit(size_t i) const { 1407 assert(i < Length && "out of bounds access"); 1408 if (CharByteWidth == 1) 1409 return static_cast<unsigned char>(StrData.asChar[i]); 1410 if (CharByteWidth == 4) 1411 return StrData.asUInt32[i]; 1412 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1413 return StrData.asUInt16[i]; 1414 } 1415 1416 unsigned getByteLength() const { return CharByteWidth*Length; } 1417 unsigned getLength() const { return Length; } 1418 unsigned getCharByteWidth() const { return CharByteWidth; } 1419 1420 /// \brief Sets the string data to the given string data. 1421 void setString(ASTContext &C, StringRef Str, 1422 StringKind Kind, bool IsPascal); 1423 1424 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1425 1426 1427 bool isAscii() const { return Kind == Ascii; } 1428 bool isWide() const { return Kind == Wide; } 1429 bool isUTF8() const { return Kind == UTF8; } 1430 bool isUTF16() const { return Kind == UTF16; } 1431 bool isUTF32() const { return Kind == UTF32; } 1432 bool isPascal() const { return IsPascal; } 1433 1434 bool containsNonAsciiOrNull() const { 1435 StringRef Str = getString(); 1436 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1437 if (!isascii(Str[i]) || !Str[i]) 1438 return true; 1439 return false; 1440 } 1441 1442 /// getNumConcatenated - Get the number of string literal tokens that were 1443 /// concatenated in translation phase #6 to form this string literal. 1444 unsigned getNumConcatenated() const { return NumConcatenated; } 1445 1446 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1447 assert(TokNum < NumConcatenated && "Invalid tok number"); 1448 return TokLocs[TokNum]; 1449 } 1450 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1451 assert(TokNum < NumConcatenated && "Invalid tok number"); 1452 TokLocs[TokNum] = L; 1453 } 1454 1455 /// getLocationOfByte - Return a source location that points to the specified 1456 /// byte of this string literal. 1457 /// 1458 /// Strings are amazingly complex. They can be formed from multiple tokens 1459 /// and can have escape sequences in them in addition to the usual trigraph 1460 /// and escaped newline business. This routine handles this complexity. 1461 /// 1462 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1463 const LangOptions &Features, 1464 const TargetInfo &Target) const; 1465 1466 typedef const SourceLocation *tokloc_iterator; 1467 tokloc_iterator tokloc_begin() const { return TokLocs; } 1468 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1469 1470 SourceRange getSourceRange() const LLVM_READONLY { 1471 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1472 } 1473 static bool classof(const Stmt *T) { 1474 return T->getStmtClass() == StringLiteralClass; 1475 } 1476 static bool classof(const StringLiteral *) { return true; } 1477 1478 // Iterators 1479 child_range children() { return child_range(); } 1480}; 1481 1482/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1483/// AST node is only formed if full location information is requested. 1484class ParenExpr : public Expr { 1485 SourceLocation L, R; 1486 Stmt *Val; 1487public: 1488 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1489 : Expr(ParenExprClass, val->getType(), 1490 val->getValueKind(), val->getObjectKind(), 1491 val->isTypeDependent(), val->isValueDependent(), 1492 val->isInstantiationDependent(), 1493 val->containsUnexpandedParameterPack()), 1494 L(l), R(r), Val(val) {} 1495 1496 /// \brief Construct an empty parenthesized expression. 1497 explicit ParenExpr(EmptyShell Empty) 1498 : Expr(ParenExprClass, Empty) { } 1499 1500 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1501 Expr *getSubExpr() { return cast<Expr>(Val); } 1502 void setSubExpr(Expr *E) { Val = E; } 1503 1504 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(L, R); } 1505 1506 /// \brief Get the location of the left parentheses '('. 1507 SourceLocation getLParen() const { return L; } 1508 void setLParen(SourceLocation Loc) { L = Loc; } 1509 1510 /// \brief Get the location of the right parentheses ')'. 1511 SourceLocation getRParen() const { return R; } 1512 void setRParen(SourceLocation Loc) { R = Loc; } 1513 1514 static bool classof(const Stmt *T) { 1515 return T->getStmtClass() == ParenExprClass; 1516 } 1517 static bool classof(const ParenExpr *) { return true; } 1518 1519 // Iterators 1520 child_range children() { return child_range(&Val, &Val+1); } 1521}; 1522 1523 1524/// UnaryOperator - This represents the unary-expression's (except sizeof and 1525/// alignof), the postinc/postdec operators from postfix-expression, and various 1526/// extensions. 1527/// 1528/// Notes on various nodes: 1529/// 1530/// Real/Imag - These return the real/imag part of a complex operand. If 1531/// applied to a non-complex value, the former returns its operand and the 1532/// later returns zero in the type of the operand. 1533/// 1534class UnaryOperator : public Expr { 1535public: 1536 typedef UnaryOperatorKind Opcode; 1537 1538private: 1539 unsigned Opc : 5; 1540 SourceLocation Loc; 1541 Stmt *Val; 1542public: 1543 1544 UnaryOperator(Expr *input, Opcode opc, QualType type, 1545 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1546 : Expr(UnaryOperatorClass, type, VK, OK, 1547 input->isTypeDependent() || type->isDependentType(), 1548 input->isValueDependent(), 1549 (input->isInstantiationDependent() || 1550 type->isInstantiationDependentType()), 1551 input->containsUnexpandedParameterPack()), 1552 Opc(opc), Loc(l), Val(input) {} 1553 1554 /// \brief Build an empty unary operator. 1555 explicit UnaryOperator(EmptyShell Empty) 1556 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1557 1558 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1559 void setOpcode(Opcode O) { Opc = O; } 1560 1561 Expr *getSubExpr() const { return cast<Expr>(Val); } 1562 void setSubExpr(Expr *E) { Val = E; } 1563 1564 /// getOperatorLoc - Return the location of the operator. 1565 SourceLocation getOperatorLoc() const { return Loc; } 1566 void setOperatorLoc(SourceLocation L) { Loc = L; } 1567 1568 /// isPostfix - Return true if this is a postfix operation, like x++. 1569 static bool isPostfix(Opcode Op) { 1570 return Op == UO_PostInc || Op == UO_PostDec; 1571 } 1572 1573 /// isPrefix - Return true if this is a prefix operation, like --x. 1574 static bool isPrefix(Opcode Op) { 1575 return Op == UO_PreInc || Op == UO_PreDec; 1576 } 1577 1578 bool isPrefix() const { return isPrefix(getOpcode()); } 1579 bool isPostfix() const { return isPostfix(getOpcode()); } 1580 1581 static bool isIncrementOp(Opcode Op) { 1582 return Op == UO_PreInc || Op == UO_PostInc; 1583 } 1584 bool isIncrementOp() const { 1585 return isIncrementOp(getOpcode()); 1586 } 1587 1588 static bool isDecrementOp(Opcode Op) { 1589 return Op == UO_PreDec || Op == UO_PostDec; 1590 } 1591 bool isDecrementOp() const { 1592 return isDecrementOp(getOpcode()); 1593 } 1594 1595 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1596 bool isIncrementDecrementOp() const { 1597 return isIncrementDecrementOp(getOpcode()); 1598 } 1599 1600 static bool isArithmeticOp(Opcode Op) { 1601 return Op >= UO_Plus && Op <= UO_LNot; 1602 } 1603 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1604 1605 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1606 /// corresponds to, e.g. "sizeof" or "[pre]++" 1607 static const char *getOpcodeStr(Opcode Op); 1608 1609 /// \brief Retrieve the unary opcode that corresponds to the given 1610 /// overloaded operator. 1611 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1612 1613 /// \brief Retrieve the overloaded operator kind that corresponds to 1614 /// the given unary opcode. 1615 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1616 1617 SourceRange getSourceRange() const LLVM_READONLY { 1618 if (isPostfix()) 1619 return SourceRange(Val->getLocStart(), Loc); 1620 else 1621 return SourceRange(Loc, Val->getLocEnd()); 1622 } 1623 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; } 1624 1625 static bool classof(const Stmt *T) { 1626 return T->getStmtClass() == UnaryOperatorClass; 1627 } 1628 static bool classof(const UnaryOperator *) { return true; } 1629 1630 // Iterators 1631 child_range children() { return child_range(&Val, &Val+1); } 1632}; 1633 1634/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1635/// offsetof(record-type, member-designator). For example, given: 1636/// @code 1637/// struct S { 1638/// float f; 1639/// double d; 1640/// }; 1641/// struct T { 1642/// int i; 1643/// struct S s[10]; 1644/// }; 1645/// @endcode 1646/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1647 1648class OffsetOfExpr : public Expr { 1649public: 1650 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1651 class OffsetOfNode { 1652 public: 1653 /// \brief The kind of offsetof node we have. 1654 enum Kind { 1655 /// \brief An index into an array. 1656 Array = 0x00, 1657 /// \brief A field. 1658 Field = 0x01, 1659 /// \brief A field in a dependent type, known only by its name. 1660 Identifier = 0x02, 1661 /// \brief An implicit indirection through a C++ base class, when the 1662 /// field found is in a base class. 1663 Base = 0x03 1664 }; 1665 1666 private: 1667 enum { MaskBits = 2, Mask = 0x03 }; 1668 1669 /// \brief The source range that covers this part of the designator. 1670 SourceRange Range; 1671 1672 /// \brief The data describing the designator, which comes in three 1673 /// different forms, depending on the lower two bits. 1674 /// - An unsigned index into the array of Expr*'s stored after this node 1675 /// in memory, for [constant-expression] designators. 1676 /// - A FieldDecl*, for references to a known field. 1677 /// - An IdentifierInfo*, for references to a field with a given name 1678 /// when the class type is dependent. 1679 /// - A CXXBaseSpecifier*, for references that look at a field in a 1680 /// base class. 1681 uintptr_t Data; 1682 1683 public: 1684 /// \brief Create an offsetof node that refers to an array element. 1685 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1686 SourceLocation RBracketLoc) 1687 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1688 1689 /// \brief Create an offsetof node that refers to a field. 1690 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1691 SourceLocation NameLoc) 1692 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1693 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1694 1695 /// \brief Create an offsetof node that refers to an identifier. 1696 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1697 SourceLocation NameLoc) 1698 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1699 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1700 1701 /// \brief Create an offsetof node that refers into a C++ base class. 1702 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1703 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1704 1705 /// \brief Determine what kind of offsetof node this is. 1706 Kind getKind() const { 1707 return static_cast<Kind>(Data & Mask); 1708 } 1709 1710 /// \brief For an array element node, returns the index into the array 1711 /// of expressions. 1712 unsigned getArrayExprIndex() const { 1713 assert(getKind() == Array); 1714 return Data >> 2; 1715 } 1716 1717 /// \brief For a field offsetof node, returns the field. 1718 FieldDecl *getField() const { 1719 assert(getKind() == Field); 1720 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1721 } 1722 1723 /// \brief For a field or identifier offsetof node, returns the name of 1724 /// the field. 1725 IdentifierInfo *getFieldName() const; 1726 1727 /// \brief For a base class node, returns the base specifier. 1728 CXXBaseSpecifier *getBase() const { 1729 assert(getKind() == Base); 1730 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1731 } 1732 1733 /// \brief Retrieve the source range that covers this offsetof node. 1734 /// 1735 /// For an array element node, the source range contains the locations of 1736 /// the square brackets. For a field or identifier node, the source range 1737 /// contains the location of the period (if there is one) and the 1738 /// identifier. 1739 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 1740 }; 1741 1742private: 1743 1744 SourceLocation OperatorLoc, RParenLoc; 1745 // Base type; 1746 TypeSourceInfo *TSInfo; 1747 // Number of sub-components (i.e. instances of OffsetOfNode). 1748 unsigned NumComps; 1749 // Number of sub-expressions (i.e. array subscript expressions). 1750 unsigned NumExprs; 1751 1752 OffsetOfExpr(ASTContext &C, QualType type, 1753 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1754 OffsetOfNode* compsPtr, unsigned numComps, 1755 Expr** exprsPtr, unsigned numExprs, 1756 SourceLocation RParenLoc); 1757 1758 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1759 : Expr(OffsetOfExprClass, EmptyShell()), 1760 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1761 1762public: 1763 1764 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1765 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1766 OffsetOfNode* compsPtr, unsigned numComps, 1767 Expr** exprsPtr, unsigned numExprs, 1768 SourceLocation RParenLoc); 1769 1770 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1771 unsigned NumComps, unsigned NumExprs); 1772 1773 /// getOperatorLoc - Return the location of the operator. 1774 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1775 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1776 1777 /// \brief Return the location of the right parentheses. 1778 SourceLocation getRParenLoc() const { return RParenLoc; } 1779 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1780 1781 TypeSourceInfo *getTypeSourceInfo() const { 1782 return TSInfo; 1783 } 1784 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1785 TSInfo = tsi; 1786 } 1787 1788 const OffsetOfNode &getComponent(unsigned Idx) const { 1789 assert(Idx < NumComps && "Subscript out of range"); 1790 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1791 } 1792 1793 void setComponent(unsigned Idx, OffsetOfNode ON) { 1794 assert(Idx < NumComps && "Subscript out of range"); 1795 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1796 } 1797 1798 unsigned getNumComponents() const { 1799 return NumComps; 1800 } 1801 1802 Expr* getIndexExpr(unsigned Idx) { 1803 assert(Idx < NumExprs && "Subscript out of range"); 1804 return reinterpret_cast<Expr **>( 1805 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1806 } 1807 const Expr *getIndexExpr(unsigned Idx) const { 1808 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1809 } 1810 1811 void setIndexExpr(unsigned Idx, Expr* E) { 1812 assert(Idx < NumComps && "Subscript out of range"); 1813 reinterpret_cast<Expr **>( 1814 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1815 } 1816 1817 unsigned getNumExpressions() const { 1818 return NumExprs; 1819 } 1820 1821 SourceRange getSourceRange() const LLVM_READONLY { 1822 return SourceRange(OperatorLoc, RParenLoc); 1823 } 1824 1825 static bool classof(const Stmt *T) { 1826 return T->getStmtClass() == OffsetOfExprClass; 1827 } 1828 1829 static bool classof(const OffsetOfExpr *) { return true; } 1830 1831 // Iterators 1832 child_range children() { 1833 Stmt **begin = 1834 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1835 + NumComps); 1836 return child_range(begin, begin + NumExprs); 1837 } 1838}; 1839 1840/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1841/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1842/// vec_step (OpenCL 1.1 6.11.12). 1843class UnaryExprOrTypeTraitExpr : public Expr { 1844 union { 1845 TypeSourceInfo *Ty; 1846 Stmt *Ex; 1847 } Argument; 1848 SourceLocation OpLoc, RParenLoc; 1849 1850public: 1851 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1852 QualType resultType, SourceLocation op, 1853 SourceLocation rp) : 1854 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1855 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1856 // Value-dependent if the argument is type-dependent. 1857 TInfo->getType()->isDependentType(), 1858 TInfo->getType()->isInstantiationDependentType(), 1859 TInfo->getType()->containsUnexpandedParameterPack()), 1860 OpLoc(op), RParenLoc(rp) { 1861 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1862 UnaryExprOrTypeTraitExprBits.IsType = true; 1863 Argument.Ty = TInfo; 1864 } 1865 1866 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1867 QualType resultType, SourceLocation op, 1868 SourceLocation rp) : 1869 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1870 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1871 // Value-dependent if the argument is type-dependent. 1872 E->isTypeDependent(), 1873 E->isInstantiationDependent(), 1874 E->containsUnexpandedParameterPack()), 1875 OpLoc(op), RParenLoc(rp) { 1876 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1877 UnaryExprOrTypeTraitExprBits.IsType = false; 1878 Argument.Ex = E; 1879 } 1880 1881 /// \brief Construct an empty sizeof/alignof expression. 1882 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1883 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1884 1885 UnaryExprOrTypeTrait getKind() const { 1886 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind); 1887 } 1888 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;} 1889 1890 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; } 1891 QualType getArgumentType() const { 1892 return getArgumentTypeInfo()->getType(); 1893 } 1894 TypeSourceInfo *getArgumentTypeInfo() const { 1895 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1896 return Argument.Ty; 1897 } 1898 Expr *getArgumentExpr() { 1899 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1900 return static_cast<Expr*>(Argument.Ex); 1901 } 1902 const Expr *getArgumentExpr() const { 1903 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1904 } 1905 1906 void setArgument(Expr *E) { 1907 Argument.Ex = E; 1908 UnaryExprOrTypeTraitExprBits.IsType = false; 1909 } 1910 void setArgument(TypeSourceInfo *TInfo) { 1911 Argument.Ty = TInfo; 1912 UnaryExprOrTypeTraitExprBits.IsType = true; 1913 } 1914 1915 /// Gets the argument type, or the type of the argument expression, whichever 1916 /// is appropriate. 1917 QualType getTypeOfArgument() const { 1918 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1919 } 1920 1921 SourceLocation getOperatorLoc() const { return OpLoc; } 1922 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1923 1924 SourceLocation getRParenLoc() const { return RParenLoc; } 1925 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1926 1927 SourceRange getSourceRange() const LLVM_READONLY { 1928 return SourceRange(OpLoc, RParenLoc); 1929 } 1930 1931 static bool classof(const Stmt *T) { 1932 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1933 } 1934 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1935 1936 // Iterators 1937 child_range children(); 1938}; 1939 1940//===----------------------------------------------------------------------===// 1941// Postfix Operators. 1942//===----------------------------------------------------------------------===// 1943 1944/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1945class ArraySubscriptExpr : public Expr { 1946 enum { LHS, RHS, END_EXPR=2 }; 1947 Stmt* SubExprs[END_EXPR]; 1948 SourceLocation RBracketLoc; 1949public: 1950 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1951 ExprValueKind VK, ExprObjectKind OK, 1952 SourceLocation rbracketloc) 1953 : Expr(ArraySubscriptExprClass, t, VK, OK, 1954 lhs->isTypeDependent() || rhs->isTypeDependent(), 1955 lhs->isValueDependent() || rhs->isValueDependent(), 1956 (lhs->isInstantiationDependent() || 1957 rhs->isInstantiationDependent()), 1958 (lhs->containsUnexpandedParameterPack() || 1959 rhs->containsUnexpandedParameterPack())), 1960 RBracketLoc(rbracketloc) { 1961 SubExprs[LHS] = lhs; 1962 SubExprs[RHS] = rhs; 1963 } 1964 1965 /// \brief Create an empty array subscript expression. 1966 explicit ArraySubscriptExpr(EmptyShell Shell) 1967 : Expr(ArraySubscriptExprClass, Shell) { } 1968 1969 /// An array access can be written A[4] or 4[A] (both are equivalent). 1970 /// - getBase() and getIdx() always present the normalized view: A[4]. 1971 /// In this case getBase() returns "A" and getIdx() returns "4". 1972 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1973 /// 4[A] getLHS() returns "4". 1974 /// Note: Because vector element access is also written A[4] we must 1975 /// predicate the format conversion in getBase and getIdx only on the 1976 /// the type of the RHS, as it is possible for the LHS to be a vector of 1977 /// integer type 1978 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1979 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1980 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1981 1982 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1983 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1984 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1985 1986 Expr *getBase() { 1987 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1988 } 1989 1990 const Expr *getBase() const { 1991 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1992 } 1993 1994 Expr *getIdx() { 1995 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1996 } 1997 1998 const Expr *getIdx() const { 1999 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2000 } 2001 2002 SourceRange getSourceRange() const LLVM_READONLY { 2003 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 2004 } 2005 2006 SourceLocation getRBracketLoc() const { return RBracketLoc; } 2007 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 2008 2009 SourceLocation getExprLoc() const LLVM_READONLY { return getBase()->getExprLoc(); } 2010 2011 static bool classof(const Stmt *T) { 2012 return T->getStmtClass() == ArraySubscriptExprClass; 2013 } 2014 static bool classof(const ArraySubscriptExpr *) { return true; } 2015 2016 // Iterators 2017 child_range children() { 2018 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2019 } 2020}; 2021 2022 2023/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 2024/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 2025/// while its subclasses may represent alternative syntax that (semantically) 2026/// results in a function call. For example, CXXOperatorCallExpr is 2027/// a subclass for overloaded operator calls that use operator syntax, e.g., 2028/// "str1 + str2" to resolve to a function call. 2029class CallExpr : public Expr { 2030 enum { FN=0, PREARGS_START=1 }; 2031 Stmt **SubExprs; 2032 unsigned NumArgs; 2033 SourceLocation RParenLoc; 2034 2035protected: 2036 // These versions of the constructor are for derived classes. 2037 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 2038 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 2039 SourceLocation rparenloc); 2040 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 2041 2042 Stmt *getPreArg(unsigned i) { 2043 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2044 return SubExprs[PREARGS_START+i]; 2045 } 2046 const Stmt *getPreArg(unsigned i) const { 2047 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2048 return SubExprs[PREARGS_START+i]; 2049 } 2050 void setPreArg(unsigned i, Stmt *PreArg) { 2051 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2052 SubExprs[PREARGS_START+i] = PreArg; 2053 } 2054 2055 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2056 2057public: 2058 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 2059 ExprValueKind VK, SourceLocation rparenloc); 2060 2061 /// \brief Build an empty call expression. 2062 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 2063 2064 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2065 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2066 void setCallee(Expr *F) { SubExprs[FN] = F; } 2067 2068 Decl *getCalleeDecl(); 2069 const Decl *getCalleeDecl() const { 2070 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2071 } 2072 2073 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2074 FunctionDecl *getDirectCallee(); 2075 const FunctionDecl *getDirectCallee() const { 2076 return const_cast<CallExpr*>(this)->getDirectCallee(); 2077 } 2078 2079 /// getNumArgs - Return the number of actual arguments to this call. 2080 /// 2081 unsigned getNumArgs() const { return NumArgs; } 2082 2083 /// \brief Retrieve the call arguments. 2084 Expr **getArgs() { 2085 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2086 } 2087 const Expr *const *getArgs() const { 2088 return const_cast<CallExpr*>(this)->getArgs(); 2089 } 2090 2091 /// getArg - Return the specified argument. 2092 Expr *getArg(unsigned Arg) { 2093 assert(Arg < NumArgs && "Arg access out of range!"); 2094 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2095 } 2096 const Expr *getArg(unsigned Arg) const { 2097 assert(Arg < NumArgs && "Arg access out of range!"); 2098 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2099 } 2100 2101 /// setArg - Set the specified argument. 2102 void setArg(unsigned Arg, Expr *ArgExpr) { 2103 assert(Arg < NumArgs && "Arg access out of range!"); 2104 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2105 } 2106 2107 /// setNumArgs - This changes the number of arguments present in this call. 2108 /// Any orphaned expressions are deleted by this, and any new operands are set 2109 /// to null. 2110 void setNumArgs(ASTContext& C, unsigned NumArgs); 2111 2112 typedef ExprIterator arg_iterator; 2113 typedef ConstExprIterator const_arg_iterator; 2114 2115 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2116 arg_iterator arg_end() { 2117 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2118 } 2119 const_arg_iterator arg_begin() const { 2120 return SubExprs+PREARGS_START+getNumPreArgs(); 2121 } 2122 const_arg_iterator arg_end() const { 2123 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2124 } 2125 2126 /// getNumCommas - Return the number of commas that must have been present in 2127 /// this function call. 2128 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2129 2130 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2131 /// not, return 0. 2132 unsigned isBuiltinCall() const; 2133 2134 /// getCallReturnType - Get the return type of the call expr. This is not 2135 /// always the type of the expr itself, if the return type is a reference 2136 /// type. 2137 QualType getCallReturnType() const; 2138 2139 SourceLocation getRParenLoc() const { return RParenLoc; } 2140 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2141 2142 SourceRange getSourceRange() const LLVM_READONLY; 2143 SourceLocation getLocStart() const LLVM_READONLY; 2144 SourceLocation getLocEnd() const LLVM_READONLY; 2145 2146 static bool classof(const Stmt *T) { 2147 return T->getStmtClass() >= firstCallExprConstant && 2148 T->getStmtClass() <= lastCallExprConstant; 2149 } 2150 static bool classof(const CallExpr *) { return true; } 2151 2152 // Iterators 2153 child_range children() { 2154 return child_range(&SubExprs[0], 2155 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2156 } 2157}; 2158 2159/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2160/// 2161class MemberExpr : public Expr { 2162 /// Extra data stored in some member expressions. 2163 struct MemberNameQualifier { 2164 /// \brief The nested-name-specifier that qualifies the name, including 2165 /// source-location information. 2166 NestedNameSpecifierLoc QualifierLoc; 2167 2168 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2169 /// name qualifiers. 2170 DeclAccessPair FoundDecl; 2171 }; 2172 2173 /// Base - the expression for the base pointer or structure references. In 2174 /// X.F, this is "X". 2175 Stmt *Base; 2176 2177 /// MemberDecl - This is the decl being referenced by the field/member name. 2178 /// In X.F, this is the decl referenced by F. 2179 ValueDecl *MemberDecl; 2180 2181 /// MemberDNLoc - Provides source/type location info for the 2182 /// declaration name embedded in MemberDecl. 2183 DeclarationNameLoc MemberDNLoc; 2184 2185 /// MemberLoc - This is the location of the member name. 2186 SourceLocation MemberLoc; 2187 2188 /// IsArrow - True if this is "X->F", false if this is "X.F". 2189 bool IsArrow : 1; 2190 2191 /// \brief True if this member expression used a nested-name-specifier to 2192 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2193 /// declaration. When true, a MemberNameQualifier 2194 /// structure is allocated immediately after the MemberExpr. 2195 bool HasQualifierOrFoundDecl : 1; 2196 2197 /// \brief True if this member expression specified a template keyword 2198 /// and/or a template argument list explicitly, e.g., x->f<int>, 2199 /// x->template f, x->template f<int>. 2200 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2201 /// TemplateArguments (if any) are allocated immediately after 2202 /// the MemberExpr or, if the member expression also has a qualifier, 2203 /// after the MemberNameQualifier structure. 2204 bool HasTemplateKWAndArgsInfo : 1; 2205 2206 /// \brief True if this member expression refers to a method that 2207 /// was resolved from an overloaded set having size greater than 1. 2208 bool HadMultipleCandidates : 1; 2209 2210 /// \brief Retrieve the qualifier that preceded the member name, if any. 2211 MemberNameQualifier *getMemberQualifier() { 2212 assert(HasQualifierOrFoundDecl); 2213 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2214 } 2215 2216 /// \brief Retrieve the qualifier that preceded the member name, if any. 2217 const MemberNameQualifier *getMemberQualifier() const { 2218 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2219 } 2220 2221public: 2222 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2223 const DeclarationNameInfo &NameInfo, QualType ty, 2224 ExprValueKind VK, ExprObjectKind OK) 2225 : Expr(MemberExprClass, ty, VK, OK, 2226 base->isTypeDependent(), 2227 base->isValueDependent(), 2228 base->isInstantiationDependent(), 2229 base->containsUnexpandedParameterPack()), 2230 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()), 2231 MemberLoc(NameInfo.getLoc()), IsArrow(isarrow), 2232 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2233 HadMultipleCandidates(false) { 2234 assert(memberdecl->getDeclName() == NameInfo.getName()); 2235 } 2236 2237 // NOTE: this constructor should be used only when it is known that 2238 // the member name can not provide additional syntactic info 2239 // (i.e., source locations for C++ operator names or type source info 2240 // for constructors, destructors and conversion operators). 2241 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2242 SourceLocation l, QualType ty, 2243 ExprValueKind VK, ExprObjectKind OK) 2244 : Expr(MemberExprClass, ty, VK, OK, 2245 base->isTypeDependent(), base->isValueDependent(), 2246 base->isInstantiationDependent(), 2247 base->containsUnexpandedParameterPack()), 2248 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l), 2249 IsArrow(isarrow), 2250 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2251 HadMultipleCandidates(false) {} 2252 2253 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2254 NestedNameSpecifierLoc QualifierLoc, 2255 SourceLocation TemplateKWLoc, 2256 ValueDecl *memberdecl, DeclAccessPair founddecl, 2257 DeclarationNameInfo MemberNameInfo, 2258 const TemplateArgumentListInfo *targs, 2259 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2260 2261 void setBase(Expr *E) { Base = E; } 2262 Expr *getBase() const { return cast<Expr>(Base); } 2263 2264 /// \brief Retrieve the member declaration to which this expression refers. 2265 /// 2266 /// The returned declaration will either be a FieldDecl or (in C++) 2267 /// a CXXMethodDecl. 2268 ValueDecl *getMemberDecl() const { return MemberDecl; } 2269 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2270 2271 /// \brief Retrieves the declaration found by lookup. 2272 DeclAccessPair getFoundDecl() const { 2273 if (!HasQualifierOrFoundDecl) 2274 return DeclAccessPair::make(getMemberDecl(), 2275 getMemberDecl()->getAccess()); 2276 return getMemberQualifier()->FoundDecl; 2277 } 2278 2279 /// \brief Determines whether this member expression actually had 2280 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2281 /// x->Base::foo. 2282 bool hasQualifier() const { return getQualifier() != 0; } 2283 2284 /// \brief If the member name was qualified, retrieves the 2285 /// nested-name-specifier that precedes the member name. Otherwise, returns 2286 /// NULL. 2287 NestedNameSpecifier *getQualifier() const { 2288 if (!HasQualifierOrFoundDecl) 2289 return 0; 2290 2291 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2292 } 2293 2294 /// \brief If the member name was qualified, retrieves the 2295 /// nested-name-specifier that precedes the member name, with source-location 2296 /// information. 2297 NestedNameSpecifierLoc getQualifierLoc() const { 2298 if (!hasQualifier()) 2299 return NestedNameSpecifierLoc(); 2300 2301 return getMemberQualifier()->QualifierLoc; 2302 } 2303 2304 /// \brief Return the optional template keyword and arguments info. 2305 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 2306 if (!HasTemplateKWAndArgsInfo) 2307 return 0; 2308 2309 if (!HasQualifierOrFoundDecl) 2310 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 2311 2312 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 2313 getMemberQualifier() + 1); 2314 } 2315 2316 /// \brief Return the optional template keyword and arguments info. 2317 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 2318 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo(); 2319 } 2320 2321 /// \brief Retrieve the location of the template keyword preceding 2322 /// the member name, if any. 2323 SourceLocation getTemplateKeywordLoc() const { 2324 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2325 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 2326 } 2327 2328 /// \brief Retrieve the location of the left angle bracket starting the 2329 /// explicit template argument list following the member name, if any. 2330 SourceLocation getLAngleLoc() const { 2331 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2332 return getTemplateKWAndArgsInfo()->LAngleLoc; 2333 } 2334 2335 /// \brief Retrieve the location of the right angle bracket ending the 2336 /// explicit template argument list following the member name, if any. 2337 SourceLocation getRAngleLoc() const { 2338 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2339 return getTemplateKWAndArgsInfo()->RAngleLoc; 2340 } 2341 2342 /// Determines whether the member name was preceded by the template keyword. 2343 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2344 2345 /// \brief Determines whether the member name was followed by an 2346 /// explicit template argument list. 2347 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2348 2349 /// \brief Copies the template arguments (if present) into the given 2350 /// structure. 2351 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2352 if (hasExplicitTemplateArgs()) 2353 getExplicitTemplateArgs().copyInto(List); 2354 } 2355 2356 /// \brief Retrieve the explicit template argument list that 2357 /// follow the member template name. This must only be called on an 2358 /// expression with explicit template arguments. 2359 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2360 assert(hasExplicitTemplateArgs()); 2361 return *getTemplateKWAndArgsInfo(); 2362 } 2363 2364 /// \brief Retrieve the explicit template argument list that 2365 /// followed the member template name. This must only be called on 2366 /// an expression with explicit template arguments. 2367 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2368 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2369 } 2370 2371 /// \brief Retrieves the optional explicit template arguments. 2372 /// This points to the same data as getExplicitTemplateArgs(), but 2373 /// returns null if there are no explicit template arguments. 2374 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2375 if (!hasExplicitTemplateArgs()) return 0; 2376 return &getExplicitTemplateArgs(); 2377 } 2378 2379 /// \brief Retrieve the template arguments provided as part of this 2380 /// template-id. 2381 const TemplateArgumentLoc *getTemplateArgs() const { 2382 if (!hasExplicitTemplateArgs()) 2383 return 0; 2384 2385 return getExplicitTemplateArgs().getTemplateArgs(); 2386 } 2387 2388 /// \brief Retrieve the number of template arguments provided as part of this 2389 /// template-id. 2390 unsigned getNumTemplateArgs() const { 2391 if (!hasExplicitTemplateArgs()) 2392 return 0; 2393 2394 return getExplicitTemplateArgs().NumTemplateArgs; 2395 } 2396 2397 /// \brief Retrieve the member declaration name info. 2398 DeclarationNameInfo getMemberNameInfo() const { 2399 return DeclarationNameInfo(MemberDecl->getDeclName(), 2400 MemberLoc, MemberDNLoc); 2401 } 2402 2403 bool isArrow() const { return IsArrow; } 2404 void setArrow(bool A) { IsArrow = A; } 2405 2406 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2407 /// location of 'F'. 2408 SourceLocation getMemberLoc() const { return MemberLoc; } 2409 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2410 2411 SourceRange getSourceRange() const LLVM_READONLY; 2412 SourceLocation getLocStart() const LLVM_READONLY; 2413 SourceLocation getLocEnd() const LLVM_READONLY; 2414 2415 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; } 2416 2417 /// \brief Determine whether the base of this explicit is implicit. 2418 bool isImplicitAccess() const { 2419 return getBase() && getBase()->isImplicitCXXThis(); 2420 } 2421 2422 /// \brief Returns true if this member expression refers to a method that 2423 /// was resolved from an overloaded set having size greater than 1. 2424 bool hadMultipleCandidates() const { 2425 return HadMultipleCandidates; 2426 } 2427 /// \brief Sets the flag telling whether this expression refers to 2428 /// a method that was resolved from an overloaded set having size 2429 /// greater than 1. 2430 void setHadMultipleCandidates(bool V = true) { 2431 HadMultipleCandidates = V; 2432 } 2433 2434 static bool classof(const Stmt *T) { 2435 return T->getStmtClass() == MemberExprClass; 2436 } 2437 static bool classof(const MemberExpr *) { return true; } 2438 2439 // Iterators 2440 child_range children() { return child_range(&Base, &Base+1); } 2441 2442 friend class ASTReader; 2443 friend class ASTStmtWriter; 2444}; 2445 2446/// CompoundLiteralExpr - [C99 6.5.2.5] 2447/// 2448class CompoundLiteralExpr : public Expr { 2449 /// LParenLoc - If non-null, this is the location of the left paren in a 2450 /// compound literal like "(int){4}". This can be null if this is a 2451 /// synthesized compound expression. 2452 SourceLocation LParenLoc; 2453 2454 /// The type as written. This can be an incomplete array type, in 2455 /// which case the actual expression type will be different. 2456 /// The int part of the pair stores whether this expr is file scope. 2457 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope; 2458 Stmt *Init; 2459public: 2460 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2461 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2462 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2463 tinfo->getType()->isDependentType(), 2464 init->isValueDependent(), 2465 (init->isInstantiationDependent() || 2466 tinfo->getType()->isInstantiationDependentType()), 2467 init->containsUnexpandedParameterPack()), 2468 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {} 2469 2470 /// \brief Construct an empty compound literal. 2471 explicit CompoundLiteralExpr(EmptyShell Empty) 2472 : Expr(CompoundLiteralExprClass, Empty) { } 2473 2474 const Expr *getInitializer() const { return cast<Expr>(Init); } 2475 Expr *getInitializer() { return cast<Expr>(Init); } 2476 void setInitializer(Expr *E) { Init = E; } 2477 2478 bool isFileScope() const { return TInfoAndScope.getInt(); } 2479 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); } 2480 2481 SourceLocation getLParenLoc() const { return LParenLoc; } 2482 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2483 2484 TypeSourceInfo *getTypeSourceInfo() const { 2485 return TInfoAndScope.getPointer(); 2486 } 2487 void setTypeSourceInfo(TypeSourceInfo *tinfo) { 2488 TInfoAndScope.setPointer(tinfo); 2489 } 2490 2491 SourceRange getSourceRange() const LLVM_READONLY { 2492 // FIXME: Init should never be null. 2493 if (!Init) 2494 return SourceRange(); 2495 if (LParenLoc.isInvalid()) 2496 return Init->getSourceRange(); 2497 return SourceRange(LParenLoc, Init->getLocEnd()); 2498 } 2499 2500 static bool classof(const Stmt *T) { 2501 return T->getStmtClass() == CompoundLiteralExprClass; 2502 } 2503 static bool classof(const CompoundLiteralExpr *) { return true; } 2504 2505 // Iterators 2506 child_range children() { return child_range(&Init, &Init+1); } 2507}; 2508 2509/// CastExpr - Base class for type casts, including both implicit 2510/// casts (ImplicitCastExpr) and explicit casts that have some 2511/// representation in the source code (ExplicitCastExpr's derived 2512/// classes). 2513class CastExpr : public Expr { 2514public: 2515 typedef clang::CastKind CastKind; 2516 2517private: 2518 Stmt *Op; 2519 2520 void CheckCastConsistency() const; 2521 2522 const CXXBaseSpecifier * const *path_buffer() const { 2523 return const_cast<CastExpr*>(this)->path_buffer(); 2524 } 2525 CXXBaseSpecifier **path_buffer(); 2526 2527 void setBasePathSize(unsigned basePathSize) { 2528 CastExprBits.BasePathSize = basePathSize; 2529 assert(CastExprBits.BasePathSize == basePathSize && 2530 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2531 } 2532 2533protected: 2534 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2535 const CastKind kind, Expr *op, unsigned BasePathSize) : 2536 Expr(SC, ty, VK, OK_Ordinary, 2537 // Cast expressions are type-dependent if the type is 2538 // dependent (C++ [temp.dep.expr]p3). 2539 ty->isDependentType(), 2540 // Cast expressions are value-dependent if the type is 2541 // dependent or if the subexpression is value-dependent. 2542 ty->isDependentType() || (op && op->isValueDependent()), 2543 (ty->isInstantiationDependentType() || 2544 (op && op->isInstantiationDependent())), 2545 (ty->containsUnexpandedParameterPack() || 2546 op->containsUnexpandedParameterPack())), 2547 Op(op) { 2548 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2549 CastExprBits.Kind = kind; 2550 setBasePathSize(BasePathSize); 2551#ifndef NDEBUG 2552 CheckCastConsistency(); 2553#endif 2554 } 2555 2556 /// \brief Construct an empty cast. 2557 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2558 : Expr(SC, Empty) { 2559 setBasePathSize(BasePathSize); 2560 } 2561 2562public: 2563 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2564 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2565 const char *getCastKindName() const; 2566 2567 Expr *getSubExpr() { return cast<Expr>(Op); } 2568 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2569 void setSubExpr(Expr *E) { Op = E; } 2570 2571 /// \brief Retrieve the cast subexpression as it was written in the source 2572 /// code, looking through any implicit casts or other intermediate nodes 2573 /// introduced by semantic analysis. 2574 Expr *getSubExprAsWritten(); 2575 const Expr *getSubExprAsWritten() const { 2576 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2577 } 2578 2579 typedef CXXBaseSpecifier **path_iterator; 2580 typedef const CXXBaseSpecifier * const *path_const_iterator; 2581 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2582 unsigned path_size() const { return CastExprBits.BasePathSize; } 2583 path_iterator path_begin() { return path_buffer(); } 2584 path_iterator path_end() { return path_buffer() + path_size(); } 2585 path_const_iterator path_begin() const { return path_buffer(); } 2586 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2587 2588 void setCastPath(const CXXCastPath &Path); 2589 2590 static bool classof(const Stmt *T) { 2591 return T->getStmtClass() >= firstCastExprConstant && 2592 T->getStmtClass() <= lastCastExprConstant; 2593 } 2594 static bool classof(const CastExpr *) { return true; } 2595 2596 // Iterators 2597 child_range children() { return child_range(&Op, &Op+1); } 2598}; 2599 2600/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2601/// conversions, which have no direct representation in the original 2602/// source code. For example: converting T[]->T*, void f()->void 2603/// (*f)(), float->double, short->int, etc. 2604/// 2605/// In C, implicit casts always produce rvalues. However, in C++, an 2606/// implicit cast whose result is being bound to a reference will be 2607/// an lvalue or xvalue. For example: 2608/// 2609/// @code 2610/// class Base { }; 2611/// class Derived : public Base { }; 2612/// Derived &&ref(); 2613/// void f(Derived d) { 2614/// Base& b = d; // initializer is an ImplicitCastExpr 2615/// // to an lvalue of type Base 2616/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2617/// // to an xvalue of type Base 2618/// } 2619/// @endcode 2620class ImplicitCastExpr : public CastExpr { 2621private: 2622 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2623 unsigned BasePathLength, ExprValueKind VK) 2624 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2625 } 2626 2627 /// \brief Construct an empty implicit cast. 2628 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2629 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2630 2631public: 2632 enum OnStack_t { OnStack }; 2633 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2634 ExprValueKind VK) 2635 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2636 } 2637 2638 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2639 CastKind Kind, Expr *Operand, 2640 const CXXCastPath *BasePath, 2641 ExprValueKind Cat); 2642 2643 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2644 2645 SourceRange getSourceRange() const LLVM_READONLY { 2646 return getSubExpr()->getSourceRange(); 2647 } 2648 SourceLocation getLocStart() const LLVM_READONLY { 2649 return getSubExpr()->getLocStart(); 2650 } 2651 SourceLocation getLocEnd() const LLVM_READONLY { 2652 return getSubExpr()->getLocEnd(); 2653 } 2654 2655 static bool classof(const Stmt *T) { 2656 return T->getStmtClass() == ImplicitCastExprClass; 2657 } 2658 static bool classof(const ImplicitCastExpr *) { return true; } 2659}; 2660 2661inline Expr *Expr::IgnoreImpCasts() { 2662 Expr *e = this; 2663 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2664 e = ice->getSubExpr(); 2665 return e; 2666} 2667 2668/// ExplicitCastExpr - An explicit cast written in the source 2669/// code. 2670/// 2671/// This class is effectively an abstract class, because it provides 2672/// the basic representation of an explicitly-written cast without 2673/// specifying which kind of cast (C cast, functional cast, static 2674/// cast, etc.) was written; specific derived classes represent the 2675/// particular style of cast and its location information. 2676/// 2677/// Unlike implicit casts, explicit cast nodes have two different 2678/// types: the type that was written into the source code, and the 2679/// actual type of the expression as determined by semantic 2680/// analysis. These types may differ slightly. For example, in C++ one 2681/// can cast to a reference type, which indicates that the resulting 2682/// expression will be an lvalue or xvalue. The reference type, however, 2683/// will not be used as the type of the expression. 2684class ExplicitCastExpr : public CastExpr { 2685 /// TInfo - Source type info for the (written) type 2686 /// this expression is casting to. 2687 TypeSourceInfo *TInfo; 2688 2689protected: 2690 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2691 CastKind kind, Expr *op, unsigned PathSize, 2692 TypeSourceInfo *writtenTy) 2693 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2694 2695 /// \brief Construct an empty explicit cast. 2696 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2697 : CastExpr(SC, Shell, PathSize) { } 2698 2699public: 2700 /// getTypeInfoAsWritten - Returns the type source info for the type 2701 /// that this expression is casting to. 2702 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2703 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2704 2705 /// getTypeAsWritten - Returns the type that this expression is 2706 /// casting to, as written in the source code. 2707 QualType getTypeAsWritten() const { return TInfo->getType(); } 2708 2709 static bool classof(const Stmt *T) { 2710 return T->getStmtClass() >= firstExplicitCastExprConstant && 2711 T->getStmtClass() <= lastExplicitCastExprConstant; 2712 } 2713 static bool classof(const ExplicitCastExpr *) { return true; } 2714}; 2715 2716/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2717/// cast in C++ (C++ [expr.cast]), which uses the syntax 2718/// (Type)expr. For example: @c (int)f. 2719class CStyleCastExpr : public ExplicitCastExpr { 2720 SourceLocation LPLoc; // the location of the left paren 2721 SourceLocation RPLoc; // the location of the right paren 2722 2723 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2724 unsigned PathSize, TypeSourceInfo *writtenTy, 2725 SourceLocation l, SourceLocation r) 2726 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2727 writtenTy), LPLoc(l), RPLoc(r) {} 2728 2729 /// \brief Construct an empty C-style explicit cast. 2730 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2731 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2732 2733public: 2734 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2735 ExprValueKind VK, CastKind K, 2736 Expr *Op, const CXXCastPath *BasePath, 2737 TypeSourceInfo *WrittenTy, SourceLocation L, 2738 SourceLocation R); 2739 2740 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2741 2742 SourceLocation getLParenLoc() const { return LPLoc; } 2743 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2744 2745 SourceLocation getRParenLoc() const { return RPLoc; } 2746 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2747 2748 SourceRange getSourceRange() const LLVM_READONLY { 2749 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2750 } 2751 static bool classof(const Stmt *T) { 2752 return T->getStmtClass() == CStyleCastExprClass; 2753 } 2754 static bool classof(const CStyleCastExpr *) { return true; } 2755}; 2756 2757/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2758/// 2759/// This expression node kind describes a builtin binary operation, 2760/// such as "x + y" for integer values "x" and "y". The operands will 2761/// already have been converted to appropriate types (e.g., by 2762/// performing promotions or conversions). 2763/// 2764/// In C++, where operators may be overloaded, a different kind of 2765/// expression node (CXXOperatorCallExpr) is used to express the 2766/// invocation of an overloaded operator with operator syntax. Within 2767/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2768/// used to store an expression "x + y" depends on the subexpressions 2769/// for x and y. If neither x or y is type-dependent, and the "+" 2770/// operator resolves to a built-in operation, BinaryOperator will be 2771/// used to express the computation (x and y may still be 2772/// value-dependent). If either x or y is type-dependent, or if the 2773/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2774/// be used to express the computation. 2775class BinaryOperator : public Expr { 2776public: 2777 typedef BinaryOperatorKind Opcode; 2778 2779private: 2780 unsigned Opc : 6; 2781 SourceLocation OpLoc; 2782 2783 enum { LHS, RHS, END_EXPR }; 2784 Stmt* SubExprs[END_EXPR]; 2785public: 2786 2787 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2788 ExprValueKind VK, ExprObjectKind OK, 2789 SourceLocation opLoc) 2790 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2791 lhs->isTypeDependent() || rhs->isTypeDependent(), 2792 lhs->isValueDependent() || rhs->isValueDependent(), 2793 (lhs->isInstantiationDependent() || 2794 rhs->isInstantiationDependent()), 2795 (lhs->containsUnexpandedParameterPack() || 2796 rhs->containsUnexpandedParameterPack())), 2797 Opc(opc), OpLoc(opLoc) { 2798 SubExprs[LHS] = lhs; 2799 SubExprs[RHS] = rhs; 2800 assert(!isCompoundAssignmentOp() && 2801 "Use ArithAssignBinaryOperator for compound assignments"); 2802 } 2803 2804 /// \brief Construct an empty binary operator. 2805 explicit BinaryOperator(EmptyShell Empty) 2806 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2807 2808 SourceLocation getExprLoc() const LLVM_READONLY { return OpLoc; } 2809 SourceLocation getOperatorLoc() const { return OpLoc; } 2810 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2811 2812 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2813 void setOpcode(Opcode O) { Opc = O; } 2814 2815 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2816 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2817 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2818 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2819 2820 SourceRange getSourceRange() const LLVM_READONLY { 2821 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2822 } 2823 2824 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2825 /// corresponds to, e.g. "<<=". 2826 static const char *getOpcodeStr(Opcode Op); 2827 2828 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2829 2830 /// \brief Retrieve the binary opcode that corresponds to the given 2831 /// overloaded operator. 2832 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2833 2834 /// \brief Retrieve the overloaded operator kind that corresponds to 2835 /// the given binary opcode. 2836 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2837 2838 /// predicates to categorize the respective opcodes. 2839 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2840 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2841 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2842 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2843 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2844 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2845 2846 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2847 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2848 2849 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2850 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2851 2852 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2853 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2854 2855 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2856 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2857 2858 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2859 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2860 2861 static bool isAssignmentOp(Opcode Opc) { 2862 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2863 } 2864 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2865 2866 static bool isCompoundAssignmentOp(Opcode Opc) { 2867 return Opc > BO_Assign && Opc <= BO_OrAssign; 2868 } 2869 bool isCompoundAssignmentOp() const { 2870 return isCompoundAssignmentOp(getOpcode()); 2871 } 2872 static Opcode getOpForCompoundAssignment(Opcode Opc) { 2873 assert(isCompoundAssignmentOp(Opc)); 2874 if (Opc >= BO_AndAssign) 2875 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 2876 else 2877 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 2878 } 2879 2880 static bool isShiftAssignOp(Opcode Opc) { 2881 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2882 } 2883 bool isShiftAssignOp() const { 2884 return isShiftAssignOp(getOpcode()); 2885 } 2886 2887 static bool classof(const Stmt *S) { 2888 return S->getStmtClass() >= firstBinaryOperatorConstant && 2889 S->getStmtClass() <= lastBinaryOperatorConstant; 2890 } 2891 static bool classof(const BinaryOperator *) { return true; } 2892 2893 // Iterators 2894 child_range children() { 2895 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2896 } 2897 2898protected: 2899 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2900 ExprValueKind VK, ExprObjectKind OK, 2901 SourceLocation opLoc, bool dead) 2902 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2903 lhs->isTypeDependent() || rhs->isTypeDependent(), 2904 lhs->isValueDependent() || rhs->isValueDependent(), 2905 (lhs->isInstantiationDependent() || 2906 rhs->isInstantiationDependent()), 2907 (lhs->containsUnexpandedParameterPack() || 2908 rhs->containsUnexpandedParameterPack())), 2909 Opc(opc), OpLoc(opLoc) { 2910 SubExprs[LHS] = lhs; 2911 SubExprs[RHS] = rhs; 2912 } 2913 2914 BinaryOperator(StmtClass SC, EmptyShell Empty) 2915 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2916}; 2917 2918/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2919/// track of the type the operation is performed in. Due to the semantics of 2920/// these operators, the operands are promoted, the arithmetic performed, an 2921/// implicit conversion back to the result type done, then the assignment takes 2922/// place. This captures the intermediate type which the computation is done 2923/// in. 2924class CompoundAssignOperator : public BinaryOperator { 2925 QualType ComputationLHSType; 2926 QualType ComputationResultType; 2927public: 2928 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2929 ExprValueKind VK, ExprObjectKind OK, 2930 QualType CompLHSType, QualType CompResultType, 2931 SourceLocation OpLoc) 2932 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2933 ComputationLHSType(CompLHSType), 2934 ComputationResultType(CompResultType) { 2935 assert(isCompoundAssignmentOp() && 2936 "Only should be used for compound assignments"); 2937 } 2938 2939 /// \brief Build an empty compound assignment operator expression. 2940 explicit CompoundAssignOperator(EmptyShell Empty) 2941 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2942 2943 // The two computation types are the type the LHS is converted 2944 // to for the computation and the type of the result; the two are 2945 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2946 QualType getComputationLHSType() const { return ComputationLHSType; } 2947 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2948 2949 QualType getComputationResultType() const { return ComputationResultType; } 2950 void setComputationResultType(QualType T) { ComputationResultType = T; } 2951 2952 static bool classof(const CompoundAssignOperator *) { return true; } 2953 static bool classof(const Stmt *S) { 2954 return S->getStmtClass() == CompoundAssignOperatorClass; 2955 } 2956}; 2957 2958/// AbstractConditionalOperator - An abstract base class for 2959/// ConditionalOperator and BinaryConditionalOperator. 2960class AbstractConditionalOperator : public Expr { 2961 SourceLocation QuestionLoc, ColonLoc; 2962 friend class ASTStmtReader; 2963 2964protected: 2965 AbstractConditionalOperator(StmtClass SC, QualType T, 2966 ExprValueKind VK, ExprObjectKind OK, 2967 bool TD, bool VD, bool ID, 2968 bool ContainsUnexpandedParameterPack, 2969 SourceLocation qloc, 2970 SourceLocation cloc) 2971 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 2972 QuestionLoc(qloc), ColonLoc(cloc) {} 2973 2974 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2975 : Expr(SC, Empty) { } 2976 2977public: 2978 // getCond - Return the expression representing the condition for 2979 // the ?: operator. 2980 Expr *getCond() const; 2981 2982 // getTrueExpr - Return the subexpression representing the value of 2983 // the expression if the condition evaluates to true. 2984 Expr *getTrueExpr() const; 2985 2986 // getFalseExpr - Return the subexpression representing the value of 2987 // the expression if the condition evaluates to false. This is 2988 // the same as getRHS. 2989 Expr *getFalseExpr() const; 2990 2991 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2992 SourceLocation getColonLoc() const { return ColonLoc; } 2993 2994 static bool classof(const Stmt *T) { 2995 return T->getStmtClass() == ConditionalOperatorClass || 2996 T->getStmtClass() == BinaryConditionalOperatorClass; 2997 } 2998 static bool classof(const AbstractConditionalOperator *) { return true; } 2999}; 3000 3001/// ConditionalOperator - The ?: ternary operator. The GNU "missing 3002/// middle" extension is a BinaryConditionalOperator. 3003class ConditionalOperator : public AbstractConditionalOperator { 3004 enum { COND, LHS, RHS, END_EXPR }; 3005 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3006 3007 friend class ASTStmtReader; 3008public: 3009 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 3010 SourceLocation CLoc, Expr *rhs, 3011 QualType t, ExprValueKind VK, ExprObjectKind OK) 3012 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 3013 // FIXME: the type of the conditional operator doesn't 3014 // depend on the type of the conditional, but the standard 3015 // seems to imply that it could. File a bug! 3016 (lhs->isTypeDependent() || rhs->isTypeDependent()), 3017 (cond->isValueDependent() || lhs->isValueDependent() || 3018 rhs->isValueDependent()), 3019 (cond->isInstantiationDependent() || 3020 lhs->isInstantiationDependent() || 3021 rhs->isInstantiationDependent()), 3022 (cond->containsUnexpandedParameterPack() || 3023 lhs->containsUnexpandedParameterPack() || 3024 rhs->containsUnexpandedParameterPack()), 3025 QLoc, CLoc) { 3026 SubExprs[COND] = cond; 3027 SubExprs[LHS] = lhs; 3028 SubExprs[RHS] = rhs; 3029 } 3030 3031 /// \brief Build an empty conditional operator. 3032 explicit ConditionalOperator(EmptyShell Empty) 3033 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 3034 3035 // getCond - Return the expression representing the condition for 3036 // the ?: operator. 3037 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3038 3039 // getTrueExpr - Return the subexpression representing the value of 3040 // the expression if the condition evaluates to true. 3041 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3042 3043 // getFalseExpr - Return the subexpression representing the value of 3044 // the expression if the condition evaluates to false. This is 3045 // the same as getRHS. 3046 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3047 3048 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3049 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3050 3051 SourceRange getSourceRange() const LLVM_READONLY { 3052 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 3053 } 3054 static bool classof(const Stmt *T) { 3055 return T->getStmtClass() == ConditionalOperatorClass; 3056 } 3057 static bool classof(const ConditionalOperator *) { return true; } 3058 3059 // Iterators 3060 child_range children() { 3061 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3062 } 3063}; 3064 3065/// BinaryConditionalOperator - The GNU extension to the conditional 3066/// operator which allows the middle operand to be omitted. 3067/// 3068/// This is a different expression kind on the assumption that almost 3069/// every client ends up needing to know that these are different. 3070class BinaryConditionalOperator : public AbstractConditionalOperator { 3071 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3072 3073 /// - the common condition/left-hand-side expression, which will be 3074 /// evaluated as the opaque value 3075 /// - the condition, expressed in terms of the opaque value 3076 /// - the left-hand-side, expressed in terms of the opaque value 3077 /// - the right-hand-side 3078 Stmt *SubExprs[NUM_SUBEXPRS]; 3079 OpaqueValueExpr *OpaqueValue; 3080 3081 friend class ASTStmtReader; 3082public: 3083 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3084 Expr *cond, Expr *lhs, Expr *rhs, 3085 SourceLocation qloc, SourceLocation cloc, 3086 QualType t, ExprValueKind VK, ExprObjectKind OK) 3087 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3088 (common->isTypeDependent() || rhs->isTypeDependent()), 3089 (common->isValueDependent() || rhs->isValueDependent()), 3090 (common->isInstantiationDependent() || 3091 rhs->isInstantiationDependent()), 3092 (common->containsUnexpandedParameterPack() || 3093 rhs->containsUnexpandedParameterPack()), 3094 qloc, cloc), 3095 OpaqueValue(opaqueValue) { 3096 SubExprs[COMMON] = common; 3097 SubExprs[COND] = cond; 3098 SubExprs[LHS] = lhs; 3099 SubExprs[RHS] = rhs; 3100 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value"); 3101 } 3102 3103 /// \brief Build an empty conditional operator. 3104 explicit BinaryConditionalOperator(EmptyShell Empty) 3105 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3106 3107 /// \brief getCommon - Return the common expression, written to the 3108 /// left of the condition. The opaque value will be bound to the 3109 /// result of this expression. 3110 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3111 3112 /// \brief getOpaqueValue - Return the opaque value placeholder. 3113 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3114 3115 /// \brief getCond - Return the condition expression; this is defined 3116 /// in terms of the opaque value. 3117 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3118 3119 /// \brief getTrueExpr - Return the subexpression which will be 3120 /// evaluated if the condition evaluates to true; this is defined 3121 /// in terms of the opaque value. 3122 Expr *getTrueExpr() const { 3123 return cast<Expr>(SubExprs[LHS]); 3124 } 3125 3126 /// \brief getFalseExpr - Return the subexpression which will be 3127 /// evaluated if the condnition evaluates to false; this is 3128 /// defined in terms of the opaque value. 3129 Expr *getFalseExpr() const { 3130 return cast<Expr>(SubExprs[RHS]); 3131 } 3132 3133 SourceRange getSourceRange() const LLVM_READONLY { 3134 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 3135 } 3136 static bool classof(const Stmt *T) { 3137 return T->getStmtClass() == BinaryConditionalOperatorClass; 3138 } 3139 static bool classof(const BinaryConditionalOperator *) { return true; } 3140 3141 // Iterators 3142 child_range children() { 3143 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3144 } 3145}; 3146 3147inline Expr *AbstractConditionalOperator::getCond() const { 3148 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3149 return co->getCond(); 3150 return cast<BinaryConditionalOperator>(this)->getCond(); 3151} 3152 3153inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3154 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3155 return co->getTrueExpr(); 3156 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3157} 3158 3159inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3160 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3161 return co->getFalseExpr(); 3162 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3163} 3164 3165/// AddrLabelExpr - The GNU address of label extension, representing &&label. 3166class AddrLabelExpr : public Expr { 3167 SourceLocation AmpAmpLoc, LabelLoc; 3168 LabelDecl *Label; 3169public: 3170 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3171 QualType t) 3172 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3173 false), 3174 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3175 3176 /// \brief Build an empty address of a label expression. 3177 explicit AddrLabelExpr(EmptyShell Empty) 3178 : Expr(AddrLabelExprClass, Empty) { } 3179 3180 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3181 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3182 SourceLocation getLabelLoc() const { return LabelLoc; } 3183 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3184 3185 SourceRange getSourceRange() const LLVM_READONLY { 3186 return SourceRange(AmpAmpLoc, LabelLoc); 3187 } 3188 3189 LabelDecl *getLabel() const { return Label; } 3190 void setLabel(LabelDecl *L) { Label = L; } 3191 3192 static bool classof(const Stmt *T) { 3193 return T->getStmtClass() == AddrLabelExprClass; 3194 } 3195 static bool classof(const AddrLabelExpr *) { return true; } 3196 3197 // Iterators 3198 child_range children() { return child_range(); } 3199}; 3200 3201/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3202/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3203/// takes the value of the last subexpression. 3204/// 3205/// A StmtExpr is always an r-value; values "returned" out of a 3206/// StmtExpr will be copied. 3207class StmtExpr : public Expr { 3208 Stmt *SubStmt; 3209 SourceLocation LParenLoc, RParenLoc; 3210public: 3211 // FIXME: Does type-dependence need to be computed differently? 3212 // FIXME: Do we need to compute instantiation instantiation-dependence for 3213 // statements? (ugh!) 3214 StmtExpr(CompoundStmt *substmt, QualType T, 3215 SourceLocation lp, SourceLocation rp) : 3216 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3217 T->isDependentType(), false, false, false), 3218 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3219 3220 /// \brief Build an empty statement expression. 3221 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3222 3223 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3224 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3225 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3226 3227 SourceRange getSourceRange() const LLVM_READONLY { 3228 return SourceRange(LParenLoc, RParenLoc); 3229 } 3230 3231 SourceLocation getLParenLoc() const { return LParenLoc; } 3232 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3233 SourceLocation getRParenLoc() const { return RParenLoc; } 3234 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3235 3236 static bool classof(const Stmt *T) { 3237 return T->getStmtClass() == StmtExprClass; 3238 } 3239 static bool classof(const StmtExpr *) { return true; } 3240 3241 // Iterators 3242 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3243}; 3244 3245 3246/// ShuffleVectorExpr - clang-specific builtin-in function 3247/// __builtin_shufflevector. 3248/// This AST node represents a operator that does a constant 3249/// shuffle, similar to LLVM's shufflevector instruction. It takes 3250/// two vectors and a variable number of constant indices, 3251/// and returns the appropriately shuffled vector. 3252class ShuffleVectorExpr : public Expr { 3253 SourceLocation BuiltinLoc, RParenLoc; 3254 3255 // SubExprs - the list of values passed to the __builtin_shufflevector 3256 // function. The first two are vectors, and the rest are constant 3257 // indices. The number of values in this list is always 3258 // 2+the number of indices in the vector type. 3259 Stmt **SubExprs; 3260 unsigned NumExprs; 3261 3262public: 3263 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3264 QualType Type, SourceLocation BLoc, 3265 SourceLocation RP); 3266 3267 /// \brief Build an empty vector-shuffle expression. 3268 explicit ShuffleVectorExpr(EmptyShell Empty) 3269 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3270 3271 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3272 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3273 3274 SourceLocation getRParenLoc() const { return RParenLoc; } 3275 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3276 3277 SourceRange getSourceRange() const LLVM_READONLY { 3278 return SourceRange(BuiltinLoc, RParenLoc); 3279 } 3280 static bool classof(const Stmt *T) { 3281 return T->getStmtClass() == ShuffleVectorExprClass; 3282 } 3283 static bool classof(const ShuffleVectorExpr *) { return true; } 3284 3285 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3286 /// constant expression, the actual arguments passed in, and the function 3287 /// pointers. 3288 unsigned getNumSubExprs() const { return NumExprs; } 3289 3290 /// \brief Retrieve the array of expressions. 3291 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3292 3293 /// getExpr - Return the Expr at the specified index. 3294 Expr *getExpr(unsigned Index) { 3295 assert((Index < NumExprs) && "Arg access out of range!"); 3296 return cast<Expr>(SubExprs[Index]); 3297 } 3298 const Expr *getExpr(unsigned Index) const { 3299 assert((Index < NumExprs) && "Arg access out of range!"); 3300 return cast<Expr>(SubExprs[Index]); 3301 } 3302 3303 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3304 3305 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3306 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3307 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3308 } 3309 3310 // Iterators 3311 child_range children() { 3312 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3313 } 3314}; 3315 3316/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3317/// This AST node is similar to the conditional operator (?:) in C, with 3318/// the following exceptions: 3319/// - the test expression must be a integer constant expression. 3320/// - the expression returned acts like the chosen subexpression in every 3321/// visible way: the type is the same as that of the chosen subexpression, 3322/// and all predicates (whether it's an l-value, whether it's an integer 3323/// constant expression, etc.) return the same result as for the chosen 3324/// sub-expression. 3325class ChooseExpr : public Expr { 3326 enum { COND, LHS, RHS, END_EXPR }; 3327 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3328 SourceLocation BuiltinLoc, RParenLoc; 3329public: 3330 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3331 QualType t, ExprValueKind VK, ExprObjectKind OK, 3332 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3333 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3334 (cond->isInstantiationDependent() || 3335 lhs->isInstantiationDependent() || 3336 rhs->isInstantiationDependent()), 3337 (cond->containsUnexpandedParameterPack() || 3338 lhs->containsUnexpandedParameterPack() || 3339 rhs->containsUnexpandedParameterPack())), 3340 BuiltinLoc(BLoc), RParenLoc(RP) { 3341 SubExprs[COND] = cond; 3342 SubExprs[LHS] = lhs; 3343 SubExprs[RHS] = rhs; 3344 } 3345 3346 /// \brief Build an empty __builtin_choose_expr. 3347 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3348 3349 /// isConditionTrue - Return whether the condition is true (i.e. not 3350 /// equal to zero). 3351 bool isConditionTrue(const ASTContext &C) const; 3352 3353 /// getChosenSubExpr - Return the subexpression chosen according to the 3354 /// condition. 3355 Expr *getChosenSubExpr(const ASTContext &C) const { 3356 return isConditionTrue(C) ? getLHS() : getRHS(); 3357 } 3358 3359 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3360 void setCond(Expr *E) { SubExprs[COND] = E; } 3361 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3362 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3363 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3364 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3365 3366 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3367 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3368 3369 SourceLocation getRParenLoc() const { return RParenLoc; } 3370 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3371 3372 SourceRange getSourceRange() const LLVM_READONLY { 3373 return SourceRange(BuiltinLoc, RParenLoc); 3374 } 3375 static bool classof(const Stmt *T) { 3376 return T->getStmtClass() == ChooseExprClass; 3377 } 3378 static bool classof(const ChooseExpr *) { return true; } 3379 3380 // Iterators 3381 child_range children() { 3382 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3383 } 3384}; 3385 3386/// GNUNullExpr - Implements the GNU __null extension, which is a name 3387/// for a null pointer constant that has integral type (e.g., int or 3388/// long) and is the same size and alignment as a pointer. The __null 3389/// extension is typically only used by system headers, which define 3390/// NULL as __null in C++ rather than using 0 (which is an integer 3391/// that may not match the size of a pointer). 3392class GNUNullExpr : public Expr { 3393 /// TokenLoc - The location of the __null keyword. 3394 SourceLocation TokenLoc; 3395 3396public: 3397 GNUNullExpr(QualType Ty, SourceLocation Loc) 3398 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3399 false), 3400 TokenLoc(Loc) { } 3401 3402 /// \brief Build an empty GNU __null expression. 3403 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3404 3405 /// getTokenLocation - The location of the __null token. 3406 SourceLocation getTokenLocation() const { return TokenLoc; } 3407 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3408 3409 SourceRange getSourceRange() const LLVM_READONLY { 3410 return SourceRange(TokenLoc); 3411 } 3412 static bool classof(const Stmt *T) { 3413 return T->getStmtClass() == GNUNullExprClass; 3414 } 3415 static bool classof(const GNUNullExpr *) { return true; } 3416 3417 // Iterators 3418 child_range children() { return child_range(); } 3419}; 3420 3421/// VAArgExpr, used for the builtin function __builtin_va_arg. 3422class VAArgExpr : public Expr { 3423 Stmt *Val; 3424 TypeSourceInfo *TInfo; 3425 SourceLocation BuiltinLoc, RParenLoc; 3426public: 3427 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3428 SourceLocation RPLoc, QualType t) 3429 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3430 t->isDependentType(), false, 3431 (TInfo->getType()->isInstantiationDependentType() || 3432 e->isInstantiationDependent()), 3433 (TInfo->getType()->containsUnexpandedParameterPack() || 3434 e->containsUnexpandedParameterPack())), 3435 Val(e), TInfo(TInfo), 3436 BuiltinLoc(BLoc), 3437 RParenLoc(RPLoc) { } 3438 3439 /// \brief Create an empty __builtin_va_arg expression. 3440 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3441 3442 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3443 Expr *getSubExpr() { return cast<Expr>(Val); } 3444 void setSubExpr(Expr *E) { Val = E; } 3445 3446 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3447 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3448 3449 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3450 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3451 3452 SourceLocation getRParenLoc() const { return RParenLoc; } 3453 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3454 3455 SourceRange getSourceRange() const LLVM_READONLY { 3456 return SourceRange(BuiltinLoc, RParenLoc); 3457 } 3458 static bool classof(const Stmt *T) { 3459 return T->getStmtClass() == VAArgExprClass; 3460 } 3461 static bool classof(const VAArgExpr *) { return true; } 3462 3463 // Iterators 3464 child_range children() { return child_range(&Val, &Val+1); } 3465}; 3466 3467/// @brief Describes an C or C++ initializer list. 3468/// 3469/// InitListExpr describes an initializer list, which can be used to 3470/// initialize objects of different types, including 3471/// struct/class/union types, arrays, and vectors. For example: 3472/// 3473/// @code 3474/// struct foo x = { 1, { 2, 3 } }; 3475/// @endcode 3476/// 3477/// Prior to semantic analysis, an initializer list will represent the 3478/// initializer list as written by the user, but will have the 3479/// placeholder type "void". This initializer list is called the 3480/// syntactic form of the initializer, and may contain C99 designated 3481/// initializers (represented as DesignatedInitExprs), initializations 3482/// of subobject members without explicit braces, and so on. Clients 3483/// interested in the original syntax of the initializer list should 3484/// use the syntactic form of the initializer list. 3485/// 3486/// After semantic analysis, the initializer list will represent the 3487/// semantic form of the initializer, where the initializations of all 3488/// subobjects are made explicit with nested InitListExpr nodes and 3489/// C99 designators have been eliminated by placing the designated 3490/// initializations into the subobject they initialize. Additionally, 3491/// any "holes" in the initialization, where no initializer has been 3492/// specified for a particular subobject, will be replaced with 3493/// implicitly-generated ImplicitValueInitExpr expressions that 3494/// value-initialize the subobjects. Note, however, that the 3495/// initializer lists may still have fewer initializers than there are 3496/// elements to initialize within the object. 3497/// 3498/// Given the semantic form of the initializer list, one can retrieve 3499/// the original syntactic form of that initializer list (if it 3500/// exists) using getSyntacticForm(). Since many initializer lists 3501/// have the same syntactic and semantic forms, getSyntacticForm() may 3502/// return NULL, indicating that the current initializer list also 3503/// serves as its syntactic form. 3504class InitListExpr : public Expr { 3505 // FIXME: Eliminate this vector in favor of ASTContext allocation 3506 typedef ASTVector<Stmt *> InitExprsTy; 3507 InitExprsTy InitExprs; 3508 SourceLocation LBraceLoc, RBraceLoc; 3509 3510 /// Contains the initializer list that describes the syntactic form 3511 /// written in the source code. 3512 InitListExpr *SyntacticForm; 3513 3514 /// \brief Either: 3515 /// If this initializer list initializes an array with more elements than 3516 /// there are initializers in the list, specifies an expression to be used 3517 /// for value initialization of the rest of the elements. 3518 /// Or 3519 /// If this initializer list initializes a union, specifies which 3520 /// field within the union will be initialized. 3521 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3522 3523public: 3524 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3525 Expr **initexprs, unsigned numinits, 3526 SourceLocation rbraceloc); 3527 3528 /// \brief Build an empty initializer list. 3529 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3530 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3531 3532 unsigned getNumInits() const { return InitExprs.size(); } 3533 3534 /// \brief Retrieve the set of initializers. 3535 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3536 3537 const Expr *getInit(unsigned Init) const { 3538 assert(Init < getNumInits() && "Initializer access out of range!"); 3539 return cast_or_null<Expr>(InitExprs[Init]); 3540 } 3541 3542 Expr *getInit(unsigned Init) { 3543 assert(Init < getNumInits() && "Initializer access out of range!"); 3544 return cast_or_null<Expr>(InitExprs[Init]); 3545 } 3546 3547 void setInit(unsigned Init, Expr *expr) { 3548 assert(Init < getNumInits() && "Initializer access out of range!"); 3549 InitExprs[Init] = expr; 3550 } 3551 3552 /// \brief Reserve space for some number of initializers. 3553 void reserveInits(ASTContext &C, unsigned NumInits); 3554 3555 /// @brief Specify the number of initializers 3556 /// 3557 /// If there are more than @p NumInits initializers, the remaining 3558 /// initializers will be destroyed. If there are fewer than @p 3559 /// NumInits initializers, NULL expressions will be added for the 3560 /// unknown initializers. 3561 void resizeInits(ASTContext &Context, unsigned NumInits); 3562 3563 /// @brief Updates the initializer at index @p Init with the new 3564 /// expression @p expr, and returns the old expression at that 3565 /// location. 3566 /// 3567 /// When @p Init is out of range for this initializer list, the 3568 /// initializer list will be extended with NULL expressions to 3569 /// accommodate the new entry. 3570 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3571 3572 /// \brief If this initializer list initializes an array with more elements 3573 /// than there are initializers in the list, specifies an expression to be 3574 /// used for value initialization of the rest of the elements. 3575 Expr *getArrayFiller() { 3576 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3577 } 3578 const Expr *getArrayFiller() const { 3579 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3580 } 3581 void setArrayFiller(Expr *filler); 3582 3583 /// \brief Return true if this is an array initializer and its array "filler" 3584 /// has been set. 3585 bool hasArrayFiller() const { return getArrayFiller(); } 3586 3587 /// \brief If this initializes a union, specifies which field in the 3588 /// union to initialize. 3589 /// 3590 /// Typically, this field is the first named field within the 3591 /// union. However, a designated initializer can specify the 3592 /// initialization of a different field within the union. 3593 FieldDecl *getInitializedFieldInUnion() { 3594 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3595 } 3596 const FieldDecl *getInitializedFieldInUnion() const { 3597 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3598 } 3599 void setInitializedFieldInUnion(FieldDecl *FD) { 3600 ArrayFillerOrUnionFieldInit = FD; 3601 } 3602 3603 // Explicit InitListExpr's originate from source code (and have valid source 3604 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3605 bool isExplicit() { 3606 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3607 } 3608 3609 // Is this an initializer for an array of characters, initialized by a string 3610 // literal or an @encode? 3611 bool isStringLiteralInit() const; 3612 3613 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3614 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3615 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3616 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3617 3618 /// @brief Retrieve the initializer list that describes the 3619 /// syntactic form of the initializer. 3620 /// 3621 /// 3622 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3623 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3624 3625 bool hadArrayRangeDesignator() const { 3626 return InitListExprBits.HadArrayRangeDesignator != 0; 3627 } 3628 void sawArrayRangeDesignator(bool ARD = true) { 3629 InitListExprBits.HadArrayRangeDesignator = ARD; 3630 } 3631 3632 bool initializesStdInitializerList() const { 3633 return InitListExprBits.InitializesStdInitializerList != 0; 3634 } 3635 void setInitializesStdInitializerList(bool ISIL = true) { 3636 InitListExprBits.InitializesStdInitializerList = ISIL; 3637 } 3638 3639 SourceRange getSourceRange() const LLVM_READONLY; 3640 3641 static bool classof(const Stmt *T) { 3642 return T->getStmtClass() == InitListExprClass; 3643 } 3644 static bool classof(const InitListExpr *) { return true; } 3645 3646 // Iterators 3647 child_range children() { 3648 if (InitExprs.empty()) return child_range(); 3649 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3650 } 3651 3652 typedef InitExprsTy::iterator iterator; 3653 typedef InitExprsTy::const_iterator const_iterator; 3654 typedef InitExprsTy::reverse_iterator reverse_iterator; 3655 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3656 3657 iterator begin() { return InitExprs.begin(); } 3658 const_iterator begin() const { return InitExprs.begin(); } 3659 iterator end() { return InitExprs.end(); } 3660 const_iterator end() const { return InitExprs.end(); } 3661 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3662 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3663 reverse_iterator rend() { return InitExprs.rend(); } 3664 const_reverse_iterator rend() const { return InitExprs.rend(); } 3665 3666 friend class ASTStmtReader; 3667 friend class ASTStmtWriter; 3668}; 3669 3670/// @brief Represents a C99 designated initializer expression. 3671/// 3672/// A designated initializer expression (C99 6.7.8) contains one or 3673/// more designators (which can be field designators, array 3674/// designators, or GNU array-range designators) followed by an 3675/// expression that initializes the field or element(s) that the 3676/// designators refer to. For example, given: 3677/// 3678/// @code 3679/// struct point { 3680/// double x; 3681/// double y; 3682/// }; 3683/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3684/// @endcode 3685/// 3686/// The InitListExpr contains three DesignatedInitExprs, the first of 3687/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3688/// designators, one array designator for @c [2] followed by one field 3689/// designator for @c .y. The initalization expression will be 1.0. 3690class DesignatedInitExpr : public Expr { 3691public: 3692 /// \brief Forward declaration of the Designator class. 3693 class Designator; 3694 3695private: 3696 /// The location of the '=' or ':' prior to the actual initializer 3697 /// expression. 3698 SourceLocation EqualOrColonLoc; 3699 3700 /// Whether this designated initializer used the GNU deprecated 3701 /// syntax rather than the C99 '=' syntax. 3702 bool GNUSyntax : 1; 3703 3704 /// The number of designators in this initializer expression. 3705 unsigned NumDesignators : 15; 3706 3707 /// The number of subexpressions of this initializer expression, 3708 /// which contains both the initializer and any additional 3709 /// expressions used by array and array-range designators. 3710 unsigned NumSubExprs : 16; 3711 3712 /// \brief The designators in this designated initialization 3713 /// expression. 3714 Designator *Designators; 3715 3716 3717 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3718 const Designator *Designators, 3719 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3720 Expr **IndexExprs, unsigned NumIndexExprs, 3721 Expr *Init); 3722 3723 explicit DesignatedInitExpr(unsigned NumSubExprs) 3724 : Expr(DesignatedInitExprClass, EmptyShell()), 3725 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(0) { } 3726 3727public: 3728 /// A field designator, e.g., ".x". 3729 struct FieldDesignator { 3730 /// Refers to the field that is being initialized. The low bit 3731 /// of this field determines whether this is actually a pointer 3732 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3733 /// initially constructed, a field designator will store an 3734 /// IdentifierInfo*. After semantic analysis has resolved that 3735 /// name, the field designator will instead store a FieldDecl*. 3736 uintptr_t NameOrField; 3737 3738 /// The location of the '.' in the designated initializer. 3739 unsigned DotLoc; 3740 3741 /// The location of the field name in the designated initializer. 3742 unsigned FieldLoc; 3743 }; 3744 3745 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3746 struct ArrayOrRangeDesignator { 3747 /// Location of the first index expression within the designated 3748 /// initializer expression's list of subexpressions. 3749 unsigned Index; 3750 /// The location of the '[' starting the array range designator. 3751 unsigned LBracketLoc; 3752 /// The location of the ellipsis separating the start and end 3753 /// indices. Only valid for GNU array-range designators. 3754 unsigned EllipsisLoc; 3755 /// The location of the ']' terminating the array range designator. 3756 unsigned RBracketLoc; 3757 }; 3758 3759 /// @brief Represents a single C99 designator. 3760 /// 3761 /// @todo This class is infuriatingly similar to clang::Designator, 3762 /// but minor differences (storing indices vs. storing pointers) 3763 /// keep us from reusing it. Try harder, later, to rectify these 3764 /// differences. 3765 class Designator { 3766 /// @brief The kind of designator this describes. 3767 enum { 3768 FieldDesignator, 3769 ArrayDesignator, 3770 ArrayRangeDesignator 3771 } Kind; 3772 3773 union { 3774 /// A field designator, e.g., ".x". 3775 struct FieldDesignator Field; 3776 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3777 struct ArrayOrRangeDesignator ArrayOrRange; 3778 }; 3779 friend class DesignatedInitExpr; 3780 3781 public: 3782 Designator() {} 3783 3784 /// @brief Initializes a field designator. 3785 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3786 SourceLocation FieldLoc) 3787 : Kind(FieldDesignator) { 3788 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3789 Field.DotLoc = DotLoc.getRawEncoding(); 3790 Field.FieldLoc = FieldLoc.getRawEncoding(); 3791 } 3792 3793 /// @brief Initializes an array designator. 3794 Designator(unsigned Index, SourceLocation LBracketLoc, 3795 SourceLocation RBracketLoc) 3796 : Kind(ArrayDesignator) { 3797 ArrayOrRange.Index = Index; 3798 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3799 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3800 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3801 } 3802 3803 /// @brief Initializes a GNU array-range designator. 3804 Designator(unsigned Index, SourceLocation LBracketLoc, 3805 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3806 : Kind(ArrayRangeDesignator) { 3807 ArrayOrRange.Index = Index; 3808 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3809 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3810 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3811 } 3812 3813 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3814 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3815 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3816 3817 IdentifierInfo *getFieldName() const; 3818 3819 FieldDecl *getField() const { 3820 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3821 if (Field.NameOrField & 0x01) 3822 return 0; 3823 else 3824 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3825 } 3826 3827 void setField(FieldDecl *FD) { 3828 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3829 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3830 } 3831 3832 SourceLocation getDotLoc() const { 3833 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3834 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3835 } 3836 3837 SourceLocation getFieldLoc() const { 3838 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3839 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3840 } 3841 3842 SourceLocation getLBracketLoc() const { 3843 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3844 "Only valid on an array or array-range designator"); 3845 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3846 } 3847 3848 SourceLocation getRBracketLoc() const { 3849 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3850 "Only valid on an array or array-range designator"); 3851 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3852 } 3853 3854 SourceLocation getEllipsisLoc() const { 3855 assert(Kind == ArrayRangeDesignator && 3856 "Only valid on an array-range designator"); 3857 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3858 } 3859 3860 unsigned getFirstExprIndex() const { 3861 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3862 "Only valid on an array or array-range designator"); 3863 return ArrayOrRange.Index; 3864 } 3865 3866 SourceLocation getStartLocation() const { 3867 if (Kind == FieldDesignator) 3868 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3869 else 3870 return getLBracketLoc(); 3871 } 3872 SourceLocation getEndLocation() const { 3873 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3874 } 3875 SourceRange getSourceRange() const LLVM_READONLY { 3876 return SourceRange(getStartLocation(), getEndLocation()); 3877 } 3878 }; 3879 3880 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3881 unsigned NumDesignators, 3882 Expr **IndexExprs, unsigned NumIndexExprs, 3883 SourceLocation EqualOrColonLoc, 3884 bool GNUSyntax, Expr *Init); 3885 3886 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3887 3888 /// @brief Returns the number of designators in this initializer. 3889 unsigned size() const { return NumDesignators; } 3890 3891 // Iterator access to the designators. 3892 typedef Designator *designators_iterator; 3893 designators_iterator designators_begin() { return Designators; } 3894 designators_iterator designators_end() { 3895 return Designators + NumDesignators; 3896 } 3897 3898 typedef const Designator *const_designators_iterator; 3899 const_designators_iterator designators_begin() const { return Designators; } 3900 const_designators_iterator designators_end() const { 3901 return Designators + NumDesignators; 3902 } 3903 3904 typedef std::reverse_iterator<designators_iterator> 3905 reverse_designators_iterator; 3906 reverse_designators_iterator designators_rbegin() { 3907 return reverse_designators_iterator(designators_end()); 3908 } 3909 reverse_designators_iterator designators_rend() { 3910 return reverse_designators_iterator(designators_begin()); 3911 } 3912 3913 typedef std::reverse_iterator<const_designators_iterator> 3914 const_reverse_designators_iterator; 3915 const_reverse_designators_iterator designators_rbegin() const { 3916 return const_reverse_designators_iterator(designators_end()); 3917 } 3918 const_reverse_designators_iterator designators_rend() const { 3919 return const_reverse_designators_iterator(designators_begin()); 3920 } 3921 3922 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3923 3924 void setDesignators(ASTContext &C, const Designator *Desigs, 3925 unsigned NumDesigs); 3926 3927 Expr *getArrayIndex(const Designator& D); 3928 Expr *getArrayRangeStart(const Designator& D); 3929 Expr *getArrayRangeEnd(const Designator& D); 3930 3931 /// @brief Retrieve the location of the '=' that precedes the 3932 /// initializer value itself, if present. 3933 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3934 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3935 3936 /// @brief Determines whether this designated initializer used the 3937 /// deprecated GNU syntax for designated initializers. 3938 bool usesGNUSyntax() const { return GNUSyntax; } 3939 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3940 3941 /// @brief Retrieve the initializer value. 3942 Expr *getInit() const { 3943 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3944 } 3945 3946 void setInit(Expr *init) { 3947 *child_begin() = init; 3948 } 3949 3950 /// \brief Retrieve the total number of subexpressions in this 3951 /// designated initializer expression, including the actual 3952 /// initialized value and any expressions that occur within array 3953 /// and array-range designators. 3954 unsigned getNumSubExprs() const { return NumSubExprs; } 3955 3956 Expr *getSubExpr(unsigned Idx) { 3957 assert(Idx < NumSubExprs && "Subscript out of range"); 3958 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3959 Ptr += sizeof(DesignatedInitExpr); 3960 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3961 } 3962 3963 void setSubExpr(unsigned Idx, Expr *E) { 3964 assert(Idx < NumSubExprs && "Subscript out of range"); 3965 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3966 Ptr += sizeof(DesignatedInitExpr); 3967 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3968 } 3969 3970 /// \brief Replaces the designator at index @p Idx with the series 3971 /// of designators in [First, Last). 3972 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3973 const Designator *Last); 3974 3975 SourceRange getDesignatorsSourceRange() const; 3976 3977 SourceRange getSourceRange() const LLVM_READONLY; 3978 3979 static bool classof(const Stmt *T) { 3980 return T->getStmtClass() == DesignatedInitExprClass; 3981 } 3982 static bool classof(const DesignatedInitExpr *) { return true; } 3983 3984 // Iterators 3985 child_range children() { 3986 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3987 return child_range(begin, begin + NumSubExprs); 3988 } 3989}; 3990 3991/// \brief Represents an implicitly-generated value initialization of 3992/// an object of a given type. 3993/// 3994/// Implicit value initializations occur within semantic initializer 3995/// list expressions (InitListExpr) as placeholders for subobject 3996/// initializations not explicitly specified by the user. 3997/// 3998/// \see InitListExpr 3999class ImplicitValueInitExpr : public Expr { 4000public: 4001 explicit ImplicitValueInitExpr(QualType ty) 4002 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 4003 false, false, ty->isInstantiationDependentType(), false) { } 4004 4005 /// \brief Construct an empty implicit value initialization. 4006 explicit ImplicitValueInitExpr(EmptyShell Empty) 4007 : Expr(ImplicitValueInitExprClass, Empty) { } 4008 4009 static bool classof(const Stmt *T) { 4010 return T->getStmtClass() == ImplicitValueInitExprClass; 4011 } 4012 static bool classof(const ImplicitValueInitExpr *) { return true; } 4013 4014 SourceRange getSourceRange() const LLVM_READONLY { 4015 return SourceRange(); 4016 } 4017 4018 // Iterators 4019 child_range children() { return child_range(); } 4020}; 4021 4022 4023class ParenListExpr : public Expr { 4024 Stmt **Exprs; 4025 unsigned NumExprs; 4026 SourceLocation LParenLoc, RParenLoc; 4027 4028public: 4029 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 4030 unsigned numexprs, SourceLocation rparenloc); 4031 4032 /// \brief Build an empty paren list. 4033 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 4034 4035 unsigned getNumExprs() const { return NumExprs; } 4036 4037 const Expr* getExpr(unsigned Init) const { 4038 assert(Init < getNumExprs() && "Initializer access out of range!"); 4039 return cast_or_null<Expr>(Exprs[Init]); 4040 } 4041 4042 Expr* getExpr(unsigned Init) { 4043 assert(Init < getNumExprs() && "Initializer access out of range!"); 4044 return cast_or_null<Expr>(Exprs[Init]); 4045 } 4046 4047 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 4048 4049 SourceLocation getLParenLoc() const { return LParenLoc; } 4050 SourceLocation getRParenLoc() const { return RParenLoc; } 4051 4052 SourceRange getSourceRange() const LLVM_READONLY { 4053 return SourceRange(LParenLoc, RParenLoc); 4054 } 4055 static bool classof(const Stmt *T) { 4056 return T->getStmtClass() == ParenListExprClass; 4057 } 4058 static bool classof(const ParenListExpr *) { return true; } 4059 4060 // Iterators 4061 child_range children() { 4062 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4063 } 4064 4065 friend class ASTStmtReader; 4066 friend class ASTStmtWriter; 4067}; 4068 4069 4070/// \brief Represents a C11 generic selection. 4071/// 4072/// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4073/// expression, followed by one or more generic associations. Each generic 4074/// association specifies a type name and an expression, or "default" and an 4075/// expression (in which case it is known as a default generic association). 4076/// The type and value of the generic selection are identical to those of its 4077/// result expression, which is defined as the expression in the generic 4078/// association with a type name that is compatible with the type of the 4079/// controlling expression, or the expression in the default generic association 4080/// if no types are compatible. For example: 4081/// 4082/// @code 4083/// _Generic(X, double: 1, float: 2, default: 3) 4084/// @endcode 4085/// 4086/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4087/// or 3 if "hello". 4088/// 4089/// As an extension, generic selections are allowed in C++, where the following 4090/// additional semantics apply: 4091/// 4092/// Any generic selection whose controlling expression is type-dependent or 4093/// which names a dependent type in its association list is result-dependent, 4094/// which means that the choice of result expression is dependent. 4095/// Result-dependent generic associations are both type- and value-dependent. 4096class GenericSelectionExpr : public Expr { 4097 enum { CONTROLLING, END_EXPR }; 4098 TypeSourceInfo **AssocTypes; 4099 Stmt **SubExprs; 4100 unsigned NumAssocs, ResultIndex; 4101 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4102 4103public: 4104 GenericSelectionExpr(ASTContext &Context, 4105 SourceLocation GenericLoc, Expr *ControllingExpr, 4106 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4107 unsigned NumAssocs, SourceLocation DefaultLoc, 4108 SourceLocation RParenLoc, 4109 bool ContainsUnexpandedParameterPack, 4110 unsigned ResultIndex); 4111 4112 /// This constructor is used in the result-dependent case. 4113 GenericSelectionExpr(ASTContext &Context, 4114 SourceLocation GenericLoc, Expr *ControllingExpr, 4115 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4116 unsigned NumAssocs, SourceLocation DefaultLoc, 4117 SourceLocation RParenLoc, 4118 bool ContainsUnexpandedParameterPack); 4119 4120 explicit GenericSelectionExpr(EmptyShell Empty) 4121 : Expr(GenericSelectionExprClass, Empty) { } 4122 4123 unsigned getNumAssocs() const { return NumAssocs; } 4124 4125 SourceLocation getGenericLoc() const { return GenericLoc; } 4126 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4127 SourceLocation getRParenLoc() const { return RParenLoc; } 4128 4129 const Expr *getAssocExpr(unsigned i) const { 4130 return cast<Expr>(SubExprs[END_EXPR+i]); 4131 } 4132 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4133 4134 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4135 return AssocTypes[i]; 4136 } 4137 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4138 4139 QualType getAssocType(unsigned i) const { 4140 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4141 return TS->getType(); 4142 else 4143 return QualType(); 4144 } 4145 4146 const Expr *getControllingExpr() const { 4147 return cast<Expr>(SubExprs[CONTROLLING]); 4148 } 4149 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4150 4151 /// Whether this generic selection is result-dependent. 4152 bool isResultDependent() const { return ResultIndex == -1U; } 4153 4154 /// The zero-based index of the result expression's generic association in 4155 /// the generic selection's association list. Defined only if the 4156 /// generic selection is not result-dependent. 4157 unsigned getResultIndex() const { 4158 assert(!isResultDependent() && "Generic selection is result-dependent"); 4159 return ResultIndex; 4160 } 4161 4162 /// The generic selection's result expression. Defined only if the 4163 /// generic selection is not result-dependent. 4164 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4165 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4166 4167 SourceRange getSourceRange() const LLVM_READONLY { 4168 return SourceRange(GenericLoc, RParenLoc); 4169 } 4170 static bool classof(const Stmt *T) { 4171 return T->getStmtClass() == GenericSelectionExprClass; 4172 } 4173 static bool classof(const GenericSelectionExpr *) { return true; } 4174 4175 child_range children() { 4176 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4177 } 4178 4179 friend class ASTStmtReader; 4180}; 4181 4182//===----------------------------------------------------------------------===// 4183// Clang Extensions 4184//===----------------------------------------------------------------------===// 4185 4186 4187/// ExtVectorElementExpr - This represents access to specific elements of a 4188/// vector, and may occur on the left hand side or right hand side. For example 4189/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4190/// 4191/// Note that the base may have either vector or pointer to vector type, just 4192/// like a struct field reference. 4193/// 4194class ExtVectorElementExpr : public Expr { 4195 Stmt *Base; 4196 IdentifierInfo *Accessor; 4197 SourceLocation AccessorLoc; 4198public: 4199 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4200 IdentifierInfo &accessor, SourceLocation loc) 4201 : Expr(ExtVectorElementExprClass, ty, VK, 4202 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4203 base->isTypeDependent(), base->isValueDependent(), 4204 base->isInstantiationDependent(), 4205 base->containsUnexpandedParameterPack()), 4206 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4207 4208 /// \brief Build an empty vector element expression. 4209 explicit ExtVectorElementExpr(EmptyShell Empty) 4210 : Expr(ExtVectorElementExprClass, Empty) { } 4211 4212 const Expr *getBase() const { return cast<Expr>(Base); } 4213 Expr *getBase() { return cast<Expr>(Base); } 4214 void setBase(Expr *E) { Base = E; } 4215 4216 IdentifierInfo &getAccessor() const { return *Accessor; } 4217 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4218 4219 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4220 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4221 4222 /// getNumElements - Get the number of components being selected. 4223 unsigned getNumElements() const; 4224 4225 /// containsDuplicateElements - Return true if any element access is 4226 /// repeated. 4227 bool containsDuplicateElements() const; 4228 4229 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4230 /// aggregate Constant of ConstantInt(s). 4231 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4232 4233 SourceRange getSourceRange() const LLVM_READONLY { 4234 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4235 } 4236 4237 /// isArrow - Return true if the base expression is a pointer to vector, 4238 /// return false if the base expression is a vector. 4239 bool isArrow() const; 4240 4241 static bool classof(const Stmt *T) { 4242 return T->getStmtClass() == ExtVectorElementExprClass; 4243 } 4244 static bool classof(const ExtVectorElementExpr *) { return true; } 4245 4246 // Iterators 4247 child_range children() { return child_range(&Base, &Base+1); } 4248}; 4249 4250 4251/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4252/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4253class BlockExpr : public Expr { 4254protected: 4255 BlockDecl *TheBlock; 4256public: 4257 BlockExpr(BlockDecl *BD, QualType ty) 4258 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4259 ty->isDependentType(), ty->isDependentType(), 4260 ty->isInstantiationDependentType() || BD->isDependentContext(), 4261 false), 4262 TheBlock(BD) {} 4263 4264 /// \brief Build an empty block expression. 4265 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4266 4267 const BlockDecl *getBlockDecl() const { return TheBlock; } 4268 BlockDecl *getBlockDecl() { return TheBlock; } 4269 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4270 4271 // Convenience functions for probing the underlying BlockDecl. 4272 SourceLocation getCaretLocation() const; 4273 const Stmt *getBody() const; 4274 Stmt *getBody(); 4275 4276 SourceRange getSourceRange() const LLVM_READONLY { 4277 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4278 } 4279 4280 /// getFunctionType - Return the underlying function type for this block. 4281 const FunctionProtoType *getFunctionType() const; 4282 4283 static bool classof(const Stmt *T) { 4284 return T->getStmtClass() == BlockExprClass; 4285 } 4286 static bool classof(const BlockExpr *) { return true; } 4287 4288 // Iterators 4289 child_range children() { return child_range(); } 4290}; 4291 4292/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4293/// This AST node provides support for reinterpreting a type to another 4294/// type of the same size. 4295class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4296private: 4297 Stmt *SrcExpr; 4298 SourceLocation BuiltinLoc, RParenLoc; 4299 4300 friend class ASTReader; 4301 friend class ASTStmtReader; 4302 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4303 4304public: 4305 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4306 ExprValueKind VK, ExprObjectKind OK, 4307 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4308 : Expr(AsTypeExprClass, DstType, VK, OK, 4309 DstType->isDependentType(), 4310 DstType->isDependentType() || SrcExpr->isValueDependent(), 4311 (DstType->isInstantiationDependentType() || 4312 SrcExpr->isInstantiationDependent()), 4313 (DstType->containsUnexpandedParameterPack() || 4314 SrcExpr->containsUnexpandedParameterPack())), 4315 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4316 4317 /// getSrcExpr - Return the Expr to be converted. 4318 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4319 4320 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4321 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4322 4323 /// getRParenLoc - Return the location of final right parenthesis. 4324 SourceLocation getRParenLoc() const { return RParenLoc; } 4325 4326 SourceRange getSourceRange() const LLVM_READONLY { 4327 return SourceRange(BuiltinLoc, RParenLoc); 4328 } 4329 4330 static bool classof(const Stmt *T) { 4331 return T->getStmtClass() == AsTypeExprClass; 4332 } 4333 static bool classof(const AsTypeExpr *) { return true; } 4334 4335 // Iterators 4336 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4337}; 4338 4339/// PseudoObjectExpr - An expression which accesses a pseudo-object 4340/// l-value. A pseudo-object is an abstract object, accesses to which 4341/// are translated to calls. The pseudo-object expression has a 4342/// syntactic form, which shows how the expression was actually 4343/// written in the source code, and a semantic form, which is a series 4344/// of expressions to be executed in order which detail how the 4345/// operation is actually evaluated. Optionally, one of the semantic 4346/// forms may also provide a result value for the expression. 4347/// 4348/// If any of the semantic-form expressions is an OpaqueValueExpr, 4349/// that OVE is required to have a source expression, and it is bound 4350/// to the result of that source expression. Such OVEs may appear 4351/// only in subsequent semantic-form expressions and as 4352/// sub-expressions of the syntactic form. 4353/// 4354/// PseudoObjectExpr should be used only when an operation can be 4355/// usefully described in terms of fairly simple rewrite rules on 4356/// objects and functions that are meant to be used by end-developers. 4357/// For example, under the Itanium ABI, dynamic casts are implemented 4358/// as a call to a runtime function called __dynamic_cast; using this 4359/// class to describe that would be inappropriate because that call is 4360/// not really part of the user-visible semantics, and instead the 4361/// cast is properly reflected in the AST and IR-generation has been 4362/// taught to generate the call as necessary. In contrast, an 4363/// Objective-C property access is semantically defined to be 4364/// equivalent to a particular message send, and this is very much 4365/// part of the user model. The name of this class encourages this 4366/// modelling design. 4367class PseudoObjectExpr : public Expr { 4368 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4369 // Always at least two, because the first sub-expression is the 4370 // syntactic form. 4371 4372 // PseudoObjectExprBits.ResultIndex - The index of the 4373 // sub-expression holding the result. 0 means the result is void, 4374 // which is unambiguous because it's the index of the syntactic 4375 // form. Note that this is therefore 1 higher than the value passed 4376 // in to Create, which is an index within the semantic forms. 4377 // Note also that ASTStmtWriter assumes this encoding. 4378 4379 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); } 4380 const Expr * const *getSubExprsBuffer() const { 4381 return reinterpret_cast<const Expr * const *>(this + 1); 4382 } 4383 4384 friend class ASTStmtReader; 4385 4386 PseudoObjectExpr(QualType type, ExprValueKind VK, 4387 Expr *syntactic, ArrayRef<Expr*> semantic, 4388 unsigned resultIndex); 4389 4390 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4391 4392 unsigned getNumSubExprs() const { 4393 return PseudoObjectExprBits.NumSubExprs; 4394 } 4395 4396public: 4397 /// NoResult - A value for the result index indicating that there is 4398 /// no semantic result. 4399 enum { NoResult = ~0U }; 4400 4401 static PseudoObjectExpr *Create(ASTContext &Context, Expr *syntactic, 4402 ArrayRef<Expr*> semantic, 4403 unsigned resultIndex); 4404 4405 static PseudoObjectExpr *Create(ASTContext &Context, EmptyShell shell, 4406 unsigned numSemanticExprs); 4407 4408 /// Return the syntactic form of this expression, i.e. the 4409 /// expression it actually looks like. Likely to be expressed in 4410 /// terms of OpaqueValueExprs bound in the semantic form. 4411 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 4412 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 4413 4414 /// Return the index of the result-bearing expression into the semantics 4415 /// expressions, or PseudoObjectExpr::NoResult if there is none. 4416 unsigned getResultExprIndex() const { 4417 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 4418 return PseudoObjectExprBits.ResultIndex - 1; 4419 } 4420 4421 /// Return the result-bearing expression, or null if there is none. 4422 Expr *getResultExpr() { 4423 if (PseudoObjectExprBits.ResultIndex == 0) 4424 return 0; 4425 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 4426 } 4427 const Expr *getResultExpr() const { 4428 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 4429 } 4430 4431 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 4432 4433 typedef Expr * const *semantics_iterator; 4434 typedef const Expr * const *const_semantics_iterator; 4435 semantics_iterator semantics_begin() { 4436 return getSubExprsBuffer() + 1; 4437 } 4438 const_semantics_iterator semantics_begin() const { 4439 return getSubExprsBuffer() + 1; 4440 } 4441 semantics_iterator semantics_end() { 4442 return getSubExprsBuffer() + getNumSubExprs(); 4443 } 4444 const_semantics_iterator semantics_end() const { 4445 return getSubExprsBuffer() + getNumSubExprs(); 4446 } 4447 Expr *getSemanticExpr(unsigned index) { 4448 assert(index + 1 < getNumSubExprs()); 4449 return getSubExprsBuffer()[index + 1]; 4450 } 4451 const Expr *getSemanticExpr(unsigned index) const { 4452 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 4453 } 4454 4455 SourceLocation getExprLoc() const LLVM_READONLY { 4456 return getSyntacticForm()->getExprLoc(); 4457 } 4458 SourceRange getSourceRange() const LLVM_READONLY { 4459 return getSyntacticForm()->getSourceRange(); 4460 } 4461 4462 child_range children() { 4463 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer()); 4464 return child_range(cs, cs + getNumSubExprs()); 4465 } 4466 4467 static bool classof(const Stmt *T) { 4468 return T->getStmtClass() == PseudoObjectExprClass; 4469 } 4470 static bool classof(const PseudoObjectExpr *) { return true; } 4471}; 4472 4473/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4474/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4475/// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>. 4476/// All of these instructions take one primary pointer and at least one memory 4477/// order. 4478class AtomicExpr : public Expr { 4479public: 4480 enum AtomicOp { 4481#define BUILTIN(ID, TYPE, ATTRS) 4482#define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID, 4483#include "clang/Basic/Builtins.def" 4484 // Avoid trailing comma 4485 BI_First = 0 4486 }; 4487 4488private: 4489 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR }; 4490 Stmt* SubExprs[END_EXPR]; 4491 unsigned NumSubExprs; 4492 SourceLocation BuiltinLoc, RParenLoc; 4493 AtomicOp Op; 4494 4495 friend class ASTStmtReader; 4496 4497public: 4498 AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, QualType t, 4499 AtomicOp op, SourceLocation RP); 4500 4501 /// \brief Determine the number of arguments the specified atomic builtin 4502 /// should have. 4503 static unsigned getNumSubExprs(AtomicOp Op); 4504 4505 /// \brief Build an empty AtomicExpr. 4506 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4507 4508 Expr *getPtr() const { 4509 return cast<Expr>(SubExprs[PTR]); 4510 } 4511 Expr *getOrder() const { 4512 return cast<Expr>(SubExprs[ORDER]); 4513 } 4514 Expr *getVal1() const { 4515 if (Op == AO__c11_atomic_init) 4516 return cast<Expr>(SubExprs[ORDER]); 4517 assert(NumSubExprs > VAL1); 4518 return cast<Expr>(SubExprs[VAL1]); 4519 } 4520 Expr *getOrderFail() const { 4521 assert(NumSubExprs > ORDER_FAIL); 4522 return cast<Expr>(SubExprs[ORDER_FAIL]); 4523 } 4524 Expr *getVal2() const { 4525 if (Op == AO__atomic_exchange) 4526 return cast<Expr>(SubExprs[ORDER_FAIL]); 4527 assert(NumSubExprs > VAL2); 4528 return cast<Expr>(SubExprs[VAL2]); 4529 } 4530 Expr *getWeak() const { 4531 assert(NumSubExprs > WEAK); 4532 return cast<Expr>(SubExprs[WEAK]); 4533 } 4534 4535 AtomicOp getOp() const { return Op; } 4536 unsigned getNumSubExprs() { return NumSubExprs; } 4537 4538 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4539 4540 bool isVolatile() const { 4541 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4542 } 4543 4544 bool isCmpXChg() const { 4545 return getOp() == AO__c11_atomic_compare_exchange_strong || 4546 getOp() == AO__c11_atomic_compare_exchange_weak || 4547 getOp() == AO__atomic_compare_exchange || 4548 getOp() == AO__atomic_compare_exchange_n; 4549 } 4550 4551 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4552 SourceLocation getRParenLoc() const { return RParenLoc; } 4553 4554 SourceRange getSourceRange() const LLVM_READONLY { 4555 return SourceRange(BuiltinLoc, RParenLoc); 4556 } 4557 static bool classof(const Stmt *T) { 4558 return T->getStmtClass() == AtomicExprClass; 4559 } 4560 static bool classof(const AtomicExpr *) { return true; } 4561 4562 // Iterators 4563 child_range children() { 4564 return child_range(SubExprs, SubExprs+NumSubExprs); 4565 } 4566}; 4567} // end namespace clang 4568 4569#endif 4570