Expr.h revision 632fbaa22fbed7c090eb83775731bfff786c2198
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "clang/AST/DeclAccessPair.h" 21#include "clang/AST/OperationKinds.h" 22#include "clang/AST/ASTVector.h" 23#include "clang/AST/TemplateBase.h" 24#include "clang/Basic/TargetInfo.h" 25#include "clang/Basic/TypeTraits.h" 26#include "llvm/ADT/APSInt.h" 27#include "llvm/ADT/APFloat.h" 28#include "llvm/ADT/SmallVector.h" 29#include "llvm/ADT/StringRef.h" 30#include "llvm/Support/Compiler.h" 31#include <cctype> 32 33namespace clang { 34 class ASTContext; 35 class APValue; 36 class Decl; 37 class IdentifierInfo; 38 class ParmVarDecl; 39 class NamedDecl; 40 class ValueDecl; 41 class BlockDecl; 42 class CXXBaseSpecifier; 43 class CXXOperatorCallExpr; 44 class CXXMemberCallExpr; 45 class ObjCPropertyRefExpr; 46 class OpaqueValueExpr; 47 48/// \brief A simple array of base specifiers. 49typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 50 51/// Expr - This represents one expression. Note that Expr's are subclasses of 52/// Stmt. This allows an expression to be transparently used any place a Stmt 53/// is required. 54/// 55class Expr : public Stmt { 56 QualType TR; 57 58protected: 59 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 60 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 61 : Stmt(SC) 62 { 63 ExprBits.TypeDependent = TD; 64 ExprBits.ValueDependent = VD; 65 ExprBits.InstantiationDependent = ID; 66 ExprBits.ValueKind = VK; 67 ExprBits.ObjectKind = OK; 68 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 69 setType(T); 70 } 71 72 /// \brief Construct an empty expression. 73 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 74 75public: 76 QualType getType() const { return TR; } 77 void setType(QualType t) { 78 // In C++, the type of an expression is always adjusted so that it 79 // will not have reference type an expression will never have 80 // reference type (C++ [expr]p6). Use 81 // QualType::getNonReferenceType() to retrieve the non-reference 82 // type. Additionally, inspect Expr::isLvalue to determine whether 83 // an expression that is adjusted in this manner should be 84 // considered an lvalue. 85 assert((t.isNull() || !t->isReferenceType()) && 86 "Expressions can't have reference type"); 87 88 TR = t; 89 } 90 91 /// isValueDependent - Determines whether this expression is 92 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 93 /// array bound of "Chars" in the following example is 94 /// value-dependent. 95 /// @code 96 /// template<int Size, char (&Chars)[Size]> struct meta_string; 97 /// @endcode 98 bool isValueDependent() const { return ExprBits.ValueDependent; } 99 100 /// \brief Set whether this expression is value-dependent or not. 101 void setValueDependent(bool VD) { 102 ExprBits.ValueDependent = VD; 103 if (VD) 104 ExprBits.InstantiationDependent = true; 105 } 106 107 /// isTypeDependent - Determines whether this expression is 108 /// type-dependent (C++ [temp.dep.expr]), which means that its type 109 /// could change from one template instantiation to the next. For 110 /// example, the expressions "x" and "x + y" are type-dependent in 111 /// the following code, but "y" is not type-dependent: 112 /// @code 113 /// template<typename T> 114 /// void add(T x, int y) { 115 /// x + y; 116 /// } 117 /// @endcode 118 bool isTypeDependent() const { return ExprBits.TypeDependent; } 119 120 /// \brief Set whether this expression is type-dependent or not. 121 void setTypeDependent(bool TD) { 122 ExprBits.TypeDependent = TD; 123 if (TD) 124 ExprBits.InstantiationDependent = true; 125 } 126 127 /// \brief Whether this expression is instantiation-dependent, meaning that 128 /// it depends in some way on a template parameter, even if neither its type 129 /// nor (constant) value can change due to the template instantiation. 130 /// 131 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 132 /// instantiation-dependent (since it involves a template parameter \c T), but 133 /// is neither type- nor value-dependent, since the type of the inner 134 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 135 /// \c sizeof is known. 136 /// 137 /// \code 138 /// template<typename T> 139 /// void f(T x, T y) { 140 /// sizeof(sizeof(T() + T()); 141 /// } 142 /// \endcode 143 /// 144 bool isInstantiationDependent() const { 145 return ExprBits.InstantiationDependent; 146 } 147 148 /// \brief Set whether this expression is instantiation-dependent or not. 149 void setInstantiationDependent(bool ID) { 150 ExprBits.InstantiationDependent = ID; 151 } 152 153 /// \brief Whether this expression contains an unexpanded parameter 154 /// pack (for C++0x variadic templates). 155 /// 156 /// Given the following function template: 157 /// 158 /// \code 159 /// template<typename F, typename ...Types> 160 /// void forward(const F &f, Types &&...args) { 161 /// f(static_cast<Types&&>(args)...); 162 /// } 163 /// \endcode 164 /// 165 /// The expressions \c args and \c static_cast<Types&&>(args) both 166 /// contain parameter packs. 167 bool containsUnexpandedParameterPack() const { 168 return ExprBits.ContainsUnexpandedParameterPack; 169 } 170 171 /// \brief Set the bit that describes whether this expression 172 /// contains an unexpanded parameter pack. 173 void setContainsUnexpandedParameterPack(bool PP = true) { 174 ExprBits.ContainsUnexpandedParameterPack = PP; 175 } 176 177 /// getExprLoc - Return the preferred location for the arrow when diagnosing 178 /// a problem with a generic expression. 179 SourceLocation getExprLoc() const LLVM_READONLY; 180 181 /// isUnusedResultAWarning - Return true if this immediate expression should 182 /// be warned about if the result is unused. If so, fill in expr, location, 183 /// and ranges with expr to warn on and source locations/ranges appropriate 184 /// for a warning. 185 bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc, 186 SourceRange &R1, SourceRange &R2, 187 ASTContext &Ctx) const; 188 189 /// isLValue - True if this expression is an "l-value" according to 190 /// the rules of the current language. C and C++ give somewhat 191 /// different rules for this concept, but in general, the result of 192 /// an l-value expression identifies a specific object whereas the 193 /// result of an r-value expression is a value detached from any 194 /// specific storage. 195 /// 196 /// C++0x divides the concept of "r-value" into pure r-values 197 /// ("pr-values") and so-called expiring values ("x-values"), which 198 /// identify specific objects that can be safely cannibalized for 199 /// their resources. This is an unfortunate abuse of terminology on 200 /// the part of the C++ committee. In Clang, when we say "r-value", 201 /// we generally mean a pr-value. 202 bool isLValue() const { return getValueKind() == VK_LValue; } 203 bool isRValue() const { return getValueKind() == VK_RValue; } 204 bool isXValue() const { return getValueKind() == VK_XValue; } 205 bool isGLValue() const { return getValueKind() != VK_RValue; } 206 207 enum LValueClassification { 208 LV_Valid, 209 LV_NotObjectType, 210 LV_IncompleteVoidType, 211 LV_DuplicateVectorComponents, 212 LV_InvalidExpression, 213 LV_InvalidMessageExpression, 214 LV_MemberFunction, 215 LV_SubObjCPropertySetting, 216 LV_ClassTemporary, 217 LV_ArrayTemporary 218 }; 219 /// Reasons why an expression might not be an l-value. 220 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 221 222 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 223 /// does not have an incomplete type, does not have a const-qualified type, 224 /// and if it is a structure or union, does not have any member (including, 225 /// recursively, any member or element of all contained aggregates or unions) 226 /// with a const-qualified type. 227 /// 228 /// \param Loc [in,out] - A source location which *may* be filled 229 /// in with the location of the expression making this a 230 /// non-modifiable lvalue, if specified. 231 enum isModifiableLvalueResult { 232 MLV_Valid, 233 MLV_NotObjectType, 234 MLV_IncompleteVoidType, 235 MLV_DuplicateVectorComponents, 236 MLV_InvalidExpression, 237 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 238 MLV_IncompleteType, 239 MLV_ConstQualified, 240 MLV_ArrayType, 241 MLV_ReadonlyProperty, 242 MLV_NoSetterProperty, 243 MLV_MemberFunction, 244 MLV_SubObjCPropertySetting, 245 MLV_InvalidMessageExpression, 246 MLV_ClassTemporary, 247 MLV_ArrayTemporary 248 }; 249 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 250 SourceLocation *Loc = 0) const; 251 252 /// \brief The return type of classify(). Represents the C++0x expression 253 /// taxonomy. 254 class Classification { 255 public: 256 /// \brief The various classification results. Most of these mean prvalue. 257 enum Kinds { 258 CL_LValue, 259 CL_XValue, 260 CL_Function, // Functions cannot be lvalues in C. 261 CL_Void, // Void cannot be an lvalue in C. 262 CL_AddressableVoid, // Void expression whose address can be taken in C. 263 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 264 CL_MemberFunction, // An expression referring to a member function 265 CL_SubObjCPropertySetting, 266 CL_ClassTemporary, // A temporary of class type, or subobject thereof. 267 CL_ArrayTemporary, // A temporary of array type. 268 CL_ObjCMessageRValue, // ObjC message is an rvalue 269 CL_PRValue // A prvalue for any other reason, of any other type 270 }; 271 /// \brief The results of modification testing. 272 enum ModifiableType { 273 CM_Untested, // testModifiable was false. 274 CM_Modifiable, 275 CM_RValue, // Not modifiable because it's an rvalue 276 CM_Function, // Not modifiable because it's a function; C++ only 277 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 278 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 279 CM_ConstQualified, 280 CM_ArrayType, 281 CM_IncompleteType 282 }; 283 284 private: 285 friend class Expr; 286 287 unsigned short Kind; 288 unsigned short Modifiable; 289 290 explicit Classification(Kinds k, ModifiableType m) 291 : Kind(k), Modifiable(m) 292 {} 293 294 public: 295 Classification() {} 296 297 Kinds getKind() const { return static_cast<Kinds>(Kind); } 298 ModifiableType getModifiable() const { 299 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 300 return static_cast<ModifiableType>(Modifiable); 301 } 302 bool isLValue() const { return Kind == CL_LValue; } 303 bool isXValue() const { return Kind == CL_XValue; } 304 bool isGLValue() const { return Kind <= CL_XValue; } 305 bool isPRValue() const { return Kind >= CL_Function; } 306 bool isRValue() const { return Kind >= CL_XValue; } 307 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 308 309 /// \brief Create a simple, modifiably lvalue 310 static Classification makeSimpleLValue() { 311 return Classification(CL_LValue, CM_Modifiable); 312 } 313 314 }; 315 /// \brief Classify - Classify this expression according to the C++0x 316 /// expression taxonomy. 317 /// 318 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 319 /// old lvalue vs rvalue. This function determines the type of expression this 320 /// is. There are three expression types: 321 /// - lvalues are classical lvalues as in C++03. 322 /// - prvalues are equivalent to rvalues in C++03. 323 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 324 /// function returning an rvalue reference. 325 /// lvalues and xvalues are collectively referred to as glvalues, while 326 /// prvalues and xvalues together form rvalues. 327 Classification Classify(ASTContext &Ctx) const { 328 return ClassifyImpl(Ctx, 0); 329 } 330 331 /// \brief ClassifyModifiable - Classify this expression according to the 332 /// C++0x expression taxonomy, and see if it is valid on the left side 333 /// of an assignment. 334 /// 335 /// This function extends classify in that it also tests whether the 336 /// expression is modifiable (C99 6.3.2.1p1). 337 /// \param Loc A source location that might be filled with a relevant location 338 /// if the expression is not modifiable. 339 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 340 return ClassifyImpl(Ctx, &Loc); 341 } 342 343 /// getValueKindForType - Given a formal return or parameter type, 344 /// give its value kind. 345 static ExprValueKind getValueKindForType(QualType T) { 346 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 347 return (isa<LValueReferenceType>(RT) 348 ? VK_LValue 349 : (RT->getPointeeType()->isFunctionType() 350 ? VK_LValue : VK_XValue)); 351 return VK_RValue; 352 } 353 354 /// getValueKind - The value kind that this expression produces. 355 ExprValueKind getValueKind() const { 356 return static_cast<ExprValueKind>(ExprBits.ValueKind); 357 } 358 359 /// getObjectKind - The object kind that this expression produces. 360 /// Object kinds are meaningful only for expressions that yield an 361 /// l-value or x-value. 362 ExprObjectKind getObjectKind() const { 363 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 364 } 365 366 bool isOrdinaryOrBitFieldObject() const { 367 ExprObjectKind OK = getObjectKind(); 368 return (OK == OK_Ordinary || OK == OK_BitField); 369 } 370 371 /// setValueKind - Set the value kind produced by this expression. 372 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 373 374 /// setObjectKind - Set the object kind produced by this expression. 375 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 376 377private: 378 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 379 380public: 381 382 /// \brief If this expression refers to a bit-field, retrieve the 383 /// declaration of that bit-field. 384 FieldDecl *getBitField(); 385 386 const FieldDecl *getBitField() const { 387 return const_cast<Expr*>(this)->getBitField(); 388 } 389 390 /// \brief If this expression is an l-value for an Objective C 391 /// property, find the underlying property reference expression. 392 const ObjCPropertyRefExpr *getObjCProperty() const; 393 394 /// \brief Returns whether this expression refers to a vector element. 395 bool refersToVectorElement() const; 396 397 /// \brief Returns whether this expression has a placeholder type. 398 bool hasPlaceholderType() const { 399 return getType()->isPlaceholderType(); 400 } 401 402 /// \brief Returns whether this expression has a specific placeholder type. 403 bool hasPlaceholderType(BuiltinType::Kind K) const { 404 assert(BuiltinType::isPlaceholderTypeKind(K)); 405 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 406 return BT->getKind() == K; 407 return false; 408 } 409 410 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 411 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 412 /// but also int expressions which are produced by things like comparisons in 413 /// C. 414 bool isKnownToHaveBooleanValue() const; 415 416 /// isIntegerConstantExpr - Return true if this expression is a valid integer 417 /// constant expression, and, if so, return its value in Result. If not a 418 /// valid i-c-e, return false and fill in Loc (if specified) with the location 419 /// of the invalid expression. 420 /// 421 /// Note: This does not perform the implicit conversions required by C++11 422 /// [expr.const]p5. 423 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 424 SourceLocation *Loc = 0, 425 bool isEvaluated = true) const; 426 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const; 427 428 /// isCXX98IntegralConstantExpr - Return true if this expression is an 429 /// integral constant expression in C++98. Can only be used in C++. 430 bool isCXX98IntegralConstantExpr(ASTContext &Ctx) const; 431 432 /// isCXX11ConstantExpr - Return true if this expression is a constant 433 /// expression in C++11. Can only be used in C++. 434 /// 435 /// Note: This does not perform the implicit conversions required by C++11 436 /// [expr.const]p5. 437 bool isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result = 0, 438 SourceLocation *Loc = 0) const; 439 440 /// isPotentialConstantExpr - Return true if this function's definition 441 /// might be usable in a constant expression in C++11, if it were marked 442 /// constexpr. Return false if the function can never produce a constant 443 /// expression, along with diagnostics describing why not. 444 static bool isPotentialConstantExpr(const FunctionDecl *FD, 445 llvm::SmallVectorImpl< 446 PartialDiagnosticAt> &Diags); 447 448 /// isConstantInitializer - Returns true if this expression can be emitted to 449 /// IR as a constant, and thus can be used as a constant initializer in C. 450 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 451 452 /// EvalStatus is a struct with detailed info about an evaluation in progress. 453 struct EvalStatus { 454 /// HasSideEffects - Whether the evaluated expression has side effects. 455 /// For example, (f() && 0) can be folded, but it still has side effects. 456 bool HasSideEffects; 457 458 /// Diag - If this is non-null, it will be filled in with a stack of notes 459 /// indicating why evaluation failed (or why it failed to produce a constant 460 /// expression). 461 /// If the expression is unfoldable, the notes will indicate why it's not 462 /// foldable. If the expression is foldable, but not a constant expression, 463 /// the notes will describes why it isn't a constant expression. If the 464 /// expression *is* a constant expression, no notes will be produced. 465 llvm::SmallVectorImpl<PartialDiagnosticAt> *Diag; 466 467 EvalStatus() : HasSideEffects(false), Diag(0) {} 468 469 // hasSideEffects - Return true if the evaluated expression has 470 // side effects. 471 bool hasSideEffects() const { 472 return HasSideEffects; 473 } 474 }; 475 476 /// EvalResult is a struct with detailed info about an evaluated expression. 477 struct EvalResult : EvalStatus { 478 /// Val - This is the value the expression can be folded to. 479 APValue Val; 480 481 // isGlobalLValue - Return true if the evaluated lvalue expression 482 // is global. 483 bool isGlobalLValue() const; 484 }; 485 486 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 487 /// an rvalue using any crazy technique (that has nothing to do with language 488 /// standards) that we want to, even if the expression has side-effects. If 489 /// this function returns true, it returns the folded constant in Result. If 490 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 491 /// applied. 492 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 493 494 /// EvaluateAsBooleanCondition - Return true if this is a constant 495 /// which we we can fold and convert to a boolean condition using 496 /// any crazy technique that we want to, even if the expression has 497 /// side-effects. 498 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 499 500 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects }; 501 502 /// EvaluateAsInt - Return true if this is a constant which we can fold and 503 /// convert to an integer, using any crazy technique that we want to. 504 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 505 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 506 507 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 508 /// constant folded without side-effects, but discard the result. 509 bool isEvaluatable(const ASTContext &Ctx) const; 510 511 /// HasSideEffects - This routine returns true for all those expressions 512 /// which must be evaluated each time and must not be optimized away 513 /// or evaluated at compile time. Example is a function call, volatile 514 /// variable read. 515 bool HasSideEffects(const ASTContext &Ctx) const; 516 517 /// \brief Determine whether this expression involves a call to any function 518 /// that is not trivial. 519 bool hasNonTrivialCall(ASTContext &Ctx); 520 521 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 522 /// integer. This must be called on an expression that constant folds to an 523 /// integer. 524 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 525 526 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 527 /// lvalue with link time known address, with no side-effects. 528 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 529 530 /// EvaluateAsInitializer - Evaluate an expression as if it were the 531 /// initializer of the given declaration. Returns true if the initializer 532 /// can be folded to a constant, and produces any relevant notes. In C++11, 533 /// notes will be produced if the expression is not a constant expression. 534 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 535 const VarDecl *VD, 536 llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 537 538 /// \brief Enumeration used to describe the kind of Null pointer constant 539 /// returned from \c isNullPointerConstant(). 540 enum NullPointerConstantKind { 541 /// \brief Expression is not a Null pointer constant. 542 NPCK_NotNull = 0, 543 544 /// \brief Expression is a Null pointer constant built from a zero integer. 545 NPCK_ZeroInteger, 546 547 /// \brief Expression is a C++0X nullptr. 548 NPCK_CXX0X_nullptr, 549 550 /// \brief Expression is a GNU-style __null constant. 551 NPCK_GNUNull 552 }; 553 554 /// \brief Enumeration used to describe how \c isNullPointerConstant() 555 /// should cope with value-dependent expressions. 556 enum NullPointerConstantValueDependence { 557 /// \brief Specifies that the expression should never be value-dependent. 558 NPC_NeverValueDependent = 0, 559 560 /// \brief Specifies that a value-dependent expression of integral or 561 /// dependent type should be considered a null pointer constant. 562 NPC_ValueDependentIsNull, 563 564 /// \brief Specifies that a value-dependent expression should be considered 565 /// to never be a null pointer constant. 566 NPC_ValueDependentIsNotNull 567 }; 568 569 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 570 /// a Null pointer constant. The return value can further distinguish the 571 /// kind of NULL pointer constant that was detected. 572 NullPointerConstantKind isNullPointerConstant( 573 ASTContext &Ctx, 574 NullPointerConstantValueDependence NPC) const; 575 576 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 577 /// write barrier. 578 bool isOBJCGCCandidate(ASTContext &Ctx) const; 579 580 /// \brief Returns true if this expression is a bound member function. 581 bool isBoundMemberFunction(ASTContext &Ctx) const; 582 583 /// \brief Given an expression of bound-member type, find the type 584 /// of the member. Returns null if this is an *overloaded* bound 585 /// member expression. 586 static QualType findBoundMemberType(const Expr *expr); 587 588 /// IgnoreImpCasts - Skip past any implicit casts which might 589 /// surround this expression. Only skips ImplicitCastExprs. 590 Expr *IgnoreImpCasts() LLVM_READONLY; 591 592 /// IgnoreImplicit - Skip past any implicit AST nodes which might 593 /// surround this expression. 594 Expr *IgnoreImplicit() LLVM_READONLY { 595 return cast<Expr>(Stmt::IgnoreImplicit()); 596 } 597 598 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 599 /// its subexpression. If that subexpression is also a ParenExpr, 600 /// then this method recursively returns its subexpression, and so forth. 601 /// Otherwise, the method returns the current Expr. 602 Expr *IgnoreParens() LLVM_READONLY; 603 604 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 605 /// or CastExprs, returning their operand. 606 Expr *IgnoreParenCasts() LLVM_READONLY; 607 608 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 609 /// any ParenExpr or ImplicitCastExprs, returning their operand. 610 Expr *IgnoreParenImpCasts() LLVM_READONLY; 611 612 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 613 /// call to a conversion operator, return the argument. 614 Expr *IgnoreConversionOperator() LLVM_READONLY; 615 616 const Expr *IgnoreConversionOperator() const LLVM_READONLY { 617 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 618 } 619 620 const Expr *IgnoreParenImpCasts() const LLVM_READONLY { 621 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 622 } 623 624 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 625 /// CastExprs that represent lvalue casts, returning their operand. 626 Expr *IgnoreParenLValueCasts() LLVM_READONLY; 627 628 const Expr *IgnoreParenLValueCasts() const LLVM_READONLY { 629 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 630 } 631 632 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 633 /// value (including ptr->int casts of the same size). Strip off any 634 /// ParenExpr or CastExprs, returning their operand. 635 Expr *IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY; 636 637 /// Ignore parentheses and derived-to-base casts. 638 Expr *ignoreParenBaseCasts() LLVM_READONLY; 639 640 const Expr *ignoreParenBaseCasts() const LLVM_READONLY { 641 return const_cast<Expr*>(this)->ignoreParenBaseCasts(); 642 } 643 644 /// \brief Determine whether this expression is a default function argument. 645 /// 646 /// Default arguments are implicitly generated in the abstract syntax tree 647 /// by semantic analysis for function calls, object constructions, etc. in 648 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 649 /// this routine also looks through any implicit casts to determine whether 650 /// the expression is a default argument. 651 bool isDefaultArgument() const; 652 653 /// \brief Determine whether the result of this expression is a 654 /// temporary object of the given class type. 655 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 656 657 /// \brief Whether this expression is an implicit reference to 'this' in C++. 658 bool isImplicitCXXThis() const; 659 660 const Expr *IgnoreImpCasts() const LLVM_READONLY { 661 return const_cast<Expr*>(this)->IgnoreImpCasts(); 662 } 663 const Expr *IgnoreParens() const LLVM_READONLY { 664 return const_cast<Expr*>(this)->IgnoreParens(); 665 } 666 const Expr *IgnoreParenCasts() const LLVM_READONLY { 667 return const_cast<Expr*>(this)->IgnoreParenCasts(); 668 } 669 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const LLVM_READONLY { 670 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 671 } 672 673 static bool hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs); 674 675 /// \brief For an expression of class type or pointer to class type, 676 /// return the most derived class decl the expression is known to refer to. 677 /// 678 /// If this expression is a cast, this method looks through it to find the 679 /// most derived decl that can be inferred from the expression. 680 /// This is valid because derived-to-base conversions have undefined 681 /// behavior if the object isn't dynamically of the derived type. 682 const CXXRecordDecl *getBestDynamicClassType() const; 683 684 static bool classof(const Stmt *T) { 685 return T->getStmtClass() >= firstExprConstant && 686 T->getStmtClass() <= lastExprConstant; 687 } 688 static bool classof(const Expr *) { return true; } 689}; 690 691 692//===----------------------------------------------------------------------===// 693// Primary Expressions. 694//===----------------------------------------------------------------------===// 695 696/// OpaqueValueExpr - An expression referring to an opaque object of a 697/// fixed type and value class. These don't correspond to concrete 698/// syntax; instead they're used to express operations (usually copy 699/// operations) on values whose source is generally obvious from 700/// context. 701class OpaqueValueExpr : public Expr { 702 friend class ASTStmtReader; 703 Expr *SourceExpr; 704 SourceLocation Loc; 705 706public: 707 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 708 ExprObjectKind OK = OK_Ordinary, 709 Expr *SourceExpr = 0) 710 : Expr(OpaqueValueExprClass, T, VK, OK, 711 T->isDependentType(), 712 T->isDependentType() || 713 (SourceExpr && SourceExpr->isValueDependent()), 714 T->isInstantiationDependentType(), 715 false), 716 SourceExpr(SourceExpr), Loc(Loc) { 717 } 718 719 /// Given an expression which invokes a copy constructor --- i.e. a 720 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 721 /// find the OpaqueValueExpr that's the source of the construction. 722 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 723 724 explicit OpaqueValueExpr(EmptyShell Empty) 725 : Expr(OpaqueValueExprClass, Empty) { } 726 727 /// \brief Retrieve the location of this expression. 728 SourceLocation getLocation() const { return Loc; } 729 730 SourceRange getSourceRange() const LLVM_READONLY { 731 if (SourceExpr) return SourceExpr->getSourceRange(); 732 return Loc; 733 } 734 SourceLocation getExprLoc() const LLVM_READONLY { 735 if (SourceExpr) return SourceExpr->getExprLoc(); 736 return Loc; 737 } 738 739 child_range children() { return child_range(); } 740 741 /// The source expression of an opaque value expression is the 742 /// expression which originally generated the value. This is 743 /// provided as a convenience for analyses that don't wish to 744 /// precisely model the execution behavior of the program. 745 /// 746 /// The source expression is typically set when building the 747 /// expression which binds the opaque value expression in the first 748 /// place. 749 Expr *getSourceExpr() const { return SourceExpr; } 750 751 static bool classof(const Stmt *T) { 752 return T->getStmtClass() == OpaqueValueExprClass; 753 } 754 static bool classof(const OpaqueValueExpr *) { return true; } 755}; 756 757/// \brief A reference to a declared variable, function, enum, etc. 758/// [C99 6.5.1p2] 759/// 760/// This encodes all the information about how a declaration is referenced 761/// within an expression. 762/// 763/// There are several optional constructs attached to DeclRefExprs only when 764/// they apply in order to conserve memory. These are laid out past the end of 765/// the object, and flags in the DeclRefExprBitfield track whether they exist: 766/// 767/// DeclRefExprBits.HasQualifier: 768/// Specifies when this declaration reference expression has a C++ 769/// nested-name-specifier. 770/// DeclRefExprBits.HasFoundDecl: 771/// Specifies when this declaration reference expression has a record of 772/// a NamedDecl (different from the referenced ValueDecl) which was found 773/// during name lookup and/or overload resolution. 774/// DeclRefExprBits.HasTemplateKWAndArgsInfo: 775/// Specifies when this declaration reference expression has an explicit 776/// C++ template keyword and/or template argument list. 777/// DeclRefExprBits.RefersToEnclosingLocal 778/// Specifies when this declaration reference expression (validly) 779/// refers to a local variable from a different function. 780class DeclRefExpr : public Expr { 781 /// \brief The declaration that we are referencing. 782 ValueDecl *D; 783 784 /// \brief The location of the declaration name itself. 785 SourceLocation Loc; 786 787 /// \brief Provides source/type location info for the declaration name 788 /// embedded in D. 789 DeclarationNameLoc DNLoc; 790 791 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 792 NestedNameSpecifierLoc &getInternalQualifierLoc() { 793 assert(hasQualifier()); 794 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 795 } 796 797 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 798 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 799 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 800 } 801 802 /// \brief Test whether there is a distinct FoundDecl attached to the end of 803 /// this DRE. 804 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 805 806 /// \brief Helper to retrieve the optional NamedDecl through which this 807 /// reference occured. 808 NamedDecl *&getInternalFoundDecl() { 809 assert(hasFoundDecl()); 810 if (hasQualifier()) 811 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 812 return *reinterpret_cast<NamedDecl **>(this + 1); 813 } 814 815 /// \brief Helper to retrieve the optional NamedDecl through which this 816 /// reference occured. 817 NamedDecl *getInternalFoundDecl() const { 818 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 819 } 820 821 DeclRefExpr(ASTContext &Ctx, 822 NestedNameSpecifierLoc QualifierLoc, 823 SourceLocation TemplateKWLoc, 824 ValueDecl *D, bool refersToEnclosingLocal, 825 const DeclarationNameInfo &NameInfo, 826 NamedDecl *FoundD, 827 const TemplateArgumentListInfo *TemplateArgs, 828 QualType T, ExprValueKind VK); 829 830 /// \brief Construct an empty declaration reference expression. 831 explicit DeclRefExpr(EmptyShell Empty) 832 : Expr(DeclRefExprClass, Empty) { } 833 834 /// \brief Computes the type- and value-dependence flags for this 835 /// declaration reference expression. 836 void computeDependence(ASTContext &C); 837 838public: 839 DeclRefExpr(ValueDecl *D, bool refersToEnclosingLocal, QualType T, 840 ExprValueKind VK, SourceLocation L, 841 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 842 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 843 D(D), Loc(L), DNLoc(LocInfo) { 844 DeclRefExprBits.HasQualifier = 0; 845 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 846 DeclRefExprBits.HasFoundDecl = 0; 847 DeclRefExprBits.HadMultipleCandidates = 0; 848 DeclRefExprBits.RefersToEnclosingLocal = refersToEnclosingLocal; 849 computeDependence(D->getASTContext()); 850 } 851 852 static DeclRefExpr *Create(ASTContext &Context, 853 NestedNameSpecifierLoc QualifierLoc, 854 SourceLocation TemplateKWLoc, 855 ValueDecl *D, 856 bool isEnclosingLocal, 857 SourceLocation NameLoc, 858 QualType T, ExprValueKind VK, 859 NamedDecl *FoundD = 0, 860 const TemplateArgumentListInfo *TemplateArgs = 0); 861 862 static DeclRefExpr *Create(ASTContext &Context, 863 NestedNameSpecifierLoc QualifierLoc, 864 SourceLocation TemplateKWLoc, 865 ValueDecl *D, 866 bool isEnclosingLocal, 867 const DeclarationNameInfo &NameInfo, 868 QualType T, ExprValueKind VK, 869 NamedDecl *FoundD = 0, 870 const TemplateArgumentListInfo *TemplateArgs = 0); 871 872 /// \brief Construct an empty declaration reference expression. 873 static DeclRefExpr *CreateEmpty(ASTContext &Context, 874 bool HasQualifier, 875 bool HasFoundDecl, 876 bool HasTemplateKWAndArgsInfo, 877 unsigned NumTemplateArgs); 878 879 ValueDecl *getDecl() { return D; } 880 const ValueDecl *getDecl() const { return D; } 881 void setDecl(ValueDecl *NewD) { D = NewD; } 882 883 DeclarationNameInfo getNameInfo() const { 884 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 885 } 886 887 SourceLocation getLocation() const { return Loc; } 888 void setLocation(SourceLocation L) { Loc = L; } 889 SourceRange getSourceRange() const LLVM_READONLY; 890 SourceLocation getLocStart() const LLVM_READONLY; 891 SourceLocation getLocEnd() const LLVM_READONLY; 892 893 /// \brief Determine whether this declaration reference was preceded by a 894 /// C++ nested-name-specifier, e.g., \c N::foo. 895 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 896 897 /// \brief If the name was qualified, retrieves the nested-name-specifier 898 /// that precedes the name. Otherwise, returns NULL. 899 NestedNameSpecifier *getQualifier() const { 900 if (!hasQualifier()) 901 return 0; 902 903 return getInternalQualifierLoc().getNestedNameSpecifier(); 904 } 905 906 /// \brief If the name was qualified, retrieves the nested-name-specifier 907 /// that precedes the name, with source-location information. 908 NestedNameSpecifierLoc getQualifierLoc() const { 909 if (!hasQualifier()) 910 return NestedNameSpecifierLoc(); 911 912 return getInternalQualifierLoc(); 913 } 914 915 /// \brief Get the NamedDecl through which this reference occured. 916 /// 917 /// This Decl may be different from the ValueDecl actually referred to in the 918 /// presence of using declarations, etc. It always returns non-NULL, and may 919 /// simple return the ValueDecl when appropriate. 920 NamedDecl *getFoundDecl() { 921 return hasFoundDecl() ? getInternalFoundDecl() : D; 922 } 923 924 /// \brief Get the NamedDecl through which this reference occurred. 925 /// See non-const variant. 926 const NamedDecl *getFoundDecl() const { 927 return hasFoundDecl() ? getInternalFoundDecl() : D; 928 } 929 930 bool hasTemplateKWAndArgsInfo() const { 931 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 932 } 933 934 /// \brief Return the optional template keyword and arguments info. 935 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 936 if (!hasTemplateKWAndArgsInfo()) 937 return 0; 938 939 if (hasFoundDecl()) 940 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 941 &getInternalFoundDecl() + 1); 942 943 if (hasQualifier()) 944 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 945 &getInternalQualifierLoc() + 1); 946 947 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 948 } 949 950 /// \brief Return the optional template keyword and arguments info. 951 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 952 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo(); 953 } 954 955 /// \brief Retrieve the location of the template keyword preceding 956 /// this name, if any. 957 SourceLocation getTemplateKeywordLoc() const { 958 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 959 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 960 } 961 962 /// \brief Retrieve the location of the left angle bracket starting the 963 /// explicit template argument list following the name, if any. 964 SourceLocation getLAngleLoc() const { 965 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 966 return getTemplateKWAndArgsInfo()->LAngleLoc; 967 } 968 969 /// \brief Retrieve the location of the right angle bracket ending the 970 /// explicit template argument list following the name, if any. 971 SourceLocation getRAngleLoc() const { 972 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 973 return getTemplateKWAndArgsInfo()->RAngleLoc; 974 } 975 976 /// \brief Determines whether the name in this declaration reference 977 /// was preceded by the template keyword. 978 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 979 980 /// \brief Determines whether this declaration reference was followed by an 981 /// explicit template argument list. 982 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 983 984 /// \brief Retrieve the explicit template argument list that followed the 985 /// member template name. 986 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 987 assert(hasExplicitTemplateArgs()); 988 return *getTemplateKWAndArgsInfo(); 989 } 990 991 /// \brief Retrieve the explicit template argument list that followed the 992 /// member template name. 993 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 994 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 995 } 996 997 /// \brief Retrieves the optional explicit template arguments. 998 /// This points to the same data as getExplicitTemplateArgs(), but 999 /// returns null if there are no explicit template arguments. 1000 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 1001 if (!hasExplicitTemplateArgs()) return 0; 1002 return &getExplicitTemplateArgs(); 1003 } 1004 1005 /// \brief Copies the template arguments (if present) into the given 1006 /// structure. 1007 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1008 if (hasExplicitTemplateArgs()) 1009 getExplicitTemplateArgs().copyInto(List); 1010 } 1011 1012 /// \brief Retrieve the template arguments provided as part of this 1013 /// template-id. 1014 const TemplateArgumentLoc *getTemplateArgs() const { 1015 if (!hasExplicitTemplateArgs()) 1016 return 0; 1017 1018 return getExplicitTemplateArgs().getTemplateArgs(); 1019 } 1020 1021 /// \brief Retrieve the number of template arguments provided as part of this 1022 /// template-id. 1023 unsigned getNumTemplateArgs() const { 1024 if (!hasExplicitTemplateArgs()) 1025 return 0; 1026 1027 return getExplicitTemplateArgs().NumTemplateArgs; 1028 } 1029 1030 /// \brief Returns true if this expression refers to a function that 1031 /// was resolved from an overloaded set having size greater than 1. 1032 bool hadMultipleCandidates() const { 1033 return DeclRefExprBits.HadMultipleCandidates; 1034 } 1035 /// \brief Sets the flag telling whether this expression refers to 1036 /// a function that was resolved from an overloaded set having size 1037 /// greater than 1. 1038 void setHadMultipleCandidates(bool V = true) { 1039 DeclRefExprBits.HadMultipleCandidates = V; 1040 } 1041 1042 /// Does this DeclRefExpr refer to a local declaration from an 1043 /// enclosing function scope? 1044 bool refersToEnclosingLocal() const { 1045 return DeclRefExprBits.RefersToEnclosingLocal; 1046 } 1047 1048 static bool classof(const Stmt *T) { 1049 return T->getStmtClass() == DeclRefExprClass; 1050 } 1051 static bool classof(const DeclRefExpr *) { return true; } 1052 1053 // Iterators 1054 child_range children() { return child_range(); } 1055 1056 friend class ASTStmtReader; 1057 friend class ASTStmtWriter; 1058}; 1059 1060/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 1061class PredefinedExpr : public Expr { 1062public: 1063 enum IdentType { 1064 Func, 1065 Function, 1066 LFunction, // Same as Function, but as wide string. 1067 PrettyFunction, 1068 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 1069 /// 'virtual' keyword is omitted for virtual member functions. 1070 PrettyFunctionNoVirtual 1071 }; 1072 1073private: 1074 SourceLocation Loc; 1075 IdentType Type; 1076public: 1077 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 1078 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 1079 type->isDependentType(), type->isDependentType(), 1080 type->isInstantiationDependentType(), 1081 /*ContainsUnexpandedParameterPack=*/false), 1082 Loc(l), Type(IT) {} 1083 1084 /// \brief Construct an empty predefined expression. 1085 explicit PredefinedExpr(EmptyShell Empty) 1086 : Expr(PredefinedExprClass, Empty) { } 1087 1088 IdentType getIdentType() const { return Type; } 1089 void setIdentType(IdentType IT) { Type = IT; } 1090 1091 SourceLocation getLocation() const { return Loc; } 1092 void setLocation(SourceLocation L) { Loc = L; } 1093 1094 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1095 1096 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1097 1098 static bool classof(const Stmt *T) { 1099 return T->getStmtClass() == PredefinedExprClass; 1100 } 1101 static bool classof(const PredefinedExpr *) { return true; } 1102 1103 // Iterators 1104 child_range children() { return child_range(); } 1105}; 1106 1107/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1108/// leaking memory. 1109/// 1110/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1111/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1112/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1113/// the APFloat/APInt values will never get freed. APNumericStorage uses 1114/// ASTContext's allocator for memory allocation. 1115class APNumericStorage { 1116 union { 1117 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1118 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1119 }; 1120 unsigned BitWidth; 1121 1122 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1123 1124 APNumericStorage(const APNumericStorage&); // do not implement 1125 APNumericStorage& operator=(const APNumericStorage&); // do not implement 1126 1127protected: 1128 APNumericStorage() : VAL(0), BitWidth(0) { } 1129 1130 llvm::APInt getIntValue() const { 1131 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1132 if (NumWords > 1) 1133 return llvm::APInt(BitWidth, NumWords, pVal); 1134 else 1135 return llvm::APInt(BitWidth, VAL); 1136 } 1137 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1138}; 1139 1140class APIntStorage : private APNumericStorage { 1141public: 1142 llvm::APInt getValue() const { return getIntValue(); } 1143 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1144}; 1145 1146class APFloatStorage : private APNumericStorage { 1147public: 1148 llvm::APFloat getValue(bool IsIEEE) const { 1149 return llvm::APFloat(getIntValue(), IsIEEE); 1150 } 1151 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1152 setIntValue(C, Val.bitcastToAPInt()); 1153 } 1154}; 1155 1156class IntegerLiteral : public Expr, public APIntStorage { 1157 SourceLocation Loc; 1158 1159 /// \brief Construct an empty integer literal. 1160 explicit IntegerLiteral(EmptyShell Empty) 1161 : Expr(IntegerLiteralClass, Empty) { } 1162 1163public: 1164 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1165 // or UnsignedLongLongTy 1166 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 1167 QualType type, SourceLocation l) 1168 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1169 false, false), 1170 Loc(l) { 1171 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 1172 assert(V.getBitWidth() == C.getIntWidth(type) && 1173 "Integer type is not the correct size for constant."); 1174 setValue(C, V); 1175 } 1176 1177 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1178 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1179 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1180 /// \param V - the value that the returned integer literal contains. 1181 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1182 QualType type, SourceLocation l); 1183 /// \brief Returns a new empty integer literal. 1184 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1185 1186 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1187 1188 /// \brief Retrieve the location of the literal. 1189 SourceLocation getLocation() const { return Loc; } 1190 1191 void setLocation(SourceLocation Location) { Loc = Location; } 1192 1193 static bool classof(const Stmt *T) { 1194 return T->getStmtClass() == IntegerLiteralClass; 1195 } 1196 static bool classof(const IntegerLiteral *) { return true; } 1197 1198 // Iterators 1199 child_range children() { return child_range(); } 1200}; 1201 1202class CharacterLiteral : public Expr { 1203public: 1204 enum CharacterKind { 1205 Ascii, 1206 Wide, 1207 UTF16, 1208 UTF32 1209 }; 1210 1211private: 1212 unsigned Value; 1213 SourceLocation Loc; 1214public: 1215 // type should be IntTy 1216 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1217 SourceLocation l) 1218 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1219 false, false), 1220 Value(value), Loc(l) { 1221 CharacterLiteralBits.Kind = kind; 1222 } 1223 1224 /// \brief Construct an empty character literal. 1225 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1226 1227 SourceLocation getLocation() const { return Loc; } 1228 CharacterKind getKind() const { 1229 return static_cast<CharacterKind>(CharacterLiteralBits.Kind); 1230 } 1231 1232 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1233 1234 unsigned getValue() const { return Value; } 1235 1236 void setLocation(SourceLocation Location) { Loc = Location; } 1237 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; } 1238 void setValue(unsigned Val) { Value = Val; } 1239 1240 static bool classof(const Stmt *T) { 1241 return T->getStmtClass() == CharacterLiteralClass; 1242 } 1243 static bool classof(const CharacterLiteral *) { return true; } 1244 1245 // Iterators 1246 child_range children() { return child_range(); } 1247}; 1248 1249class FloatingLiteral : public Expr, private APFloatStorage { 1250 SourceLocation Loc; 1251 1252 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1253 QualType Type, SourceLocation L) 1254 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1255 false, false), Loc(L) { 1256 FloatingLiteralBits.IsIEEE = 1257 &C.getTargetInfo().getLongDoubleFormat() == &llvm::APFloat::IEEEquad; 1258 FloatingLiteralBits.IsExact = isexact; 1259 setValue(C, V); 1260 } 1261 1262 /// \brief Construct an empty floating-point literal. 1263 explicit FloatingLiteral(ASTContext &C, EmptyShell Empty) 1264 : Expr(FloatingLiteralClass, Empty) { 1265 FloatingLiteralBits.IsIEEE = 1266 &C.getTargetInfo().getLongDoubleFormat() == &llvm::APFloat::IEEEquad; 1267 FloatingLiteralBits.IsExact = false; 1268 } 1269 1270public: 1271 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1272 bool isexact, QualType Type, SourceLocation L); 1273 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1274 1275 llvm::APFloat getValue() const { 1276 return APFloatStorage::getValue(FloatingLiteralBits.IsIEEE); 1277 } 1278 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1279 APFloatStorage::setValue(C, Val); 1280 } 1281 1282 bool isExact() const { return FloatingLiteralBits.IsExact; } 1283 void setExact(bool E) { FloatingLiteralBits.IsExact = E; } 1284 1285 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1286 /// double. Note that this may cause loss of precision, but is useful for 1287 /// debugging dumps, etc. 1288 double getValueAsApproximateDouble() const; 1289 1290 SourceLocation getLocation() const { return Loc; } 1291 void setLocation(SourceLocation L) { Loc = L; } 1292 1293 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1294 1295 static bool classof(const Stmt *T) { 1296 return T->getStmtClass() == FloatingLiteralClass; 1297 } 1298 static bool classof(const FloatingLiteral *) { return true; } 1299 1300 // Iterators 1301 child_range children() { return child_range(); } 1302}; 1303 1304/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1305/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1306/// IntegerLiteral classes. Instances of this class always have a Complex type 1307/// whose element type matches the subexpression. 1308/// 1309class ImaginaryLiteral : public Expr { 1310 Stmt *Val; 1311public: 1312 ImaginaryLiteral(Expr *val, QualType Ty) 1313 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1314 false, false), 1315 Val(val) {} 1316 1317 /// \brief Build an empty imaginary literal. 1318 explicit ImaginaryLiteral(EmptyShell Empty) 1319 : Expr(ImaginaryLiteralClass, Empty) { } 1320 1321 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1322 Expr *getSubExpr() { return cast<Expr>(Val); } 1323 void setSubExpr(Expr *E) { Val = E; } 1324 1325 SourceRange getSourceRange() const LLVM_READONLY { return Val->getSourceRange(); } 1326 static bool classof(const Stmt *T) { 1327 return T->getStmtClass() == ImaginaryLiteralClass; 1328 } 1329 static bool classof(const ImaginaryLiteral *) { return true; } 1330 1331 // Iterators 1332 child_range children() { return child_range(&Val, &Val+1); } 1333}; 1334 1335/// StringLiteral - This represents a string literal expression, e.g. "foo" 1336/// or L"bar" (wide strings). The actual string is returned by getStrData() 1337/// is NOT null-terminated, and the length of the string is determined by 1338/// calling getByteLength(). The C type for a string is always a 1339/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1340/// not. 1341/// 1342/// Note that strings in C can be formed by concatenation of multiple string 1343/// literal pptokens in translation phase #6. This keeps track of the locations 1344/// of each of these pieces. 1345/// 1346/// Strings in C can also be truncated and extended by assigning into arrays, 1347/// e.g. with constructs like: 1348/// char X[2] = "foobar"; 1349/// In this case, getByteLength() will return 6, but the string literal will 1350/// have type "char[2]". 1351class StringLiteral : public Expr { 1352public: 1353 enum StringKind { 1354 Ascii, 1355 Wide, 1356 UTF8, 1357 UTF16, 1358 UTF32 1359 }; 1360 1361private: 1362 friend class ASTStmtReader; 1363 1364 union { 1365 const char *asChar; 1366 const uint16_t *asUInt16; 1367 const uint32_t *asUInt32; 1368 } StrData; 1369 unsigned Length; 1370 unsigned CharByteWidth : 4; 1371 unsigned Kind : 3; 1372 unsigned IsPascal : 1; 1373 unsigned NumConcatenated; 1374 SourceLocation TokLocs[1]; 1375 1376 StringLiteral(QualType Ty) : 1377 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1378 false) {} 1379 1380 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1381 1382public: 1383 /// This is the "fully general" constructor that allows representation of 1384 /// strings formed from multiple concatenated tokens. 1385 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1386 bool Pascal, QualType Ty, 1387 const SourceLocation *Loc, unsigned NumStrs); 1388 1389 /// Simple constructor for string literals made from one token. 1390 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1391 bool Pascal, QualType Ty, 1392 SourceLocation Loc) { 1393 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1394 } 1395 1396 /// \brief Construct an empty string literal. 1397 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1398 1399 StringRef getString() const { 1400 assert(CharByteWidth==1 1401 && "This function is used in places that assume strings use char"); 1402 return StringRef(StrData.asChar, getByteLength()); 1403 } 1404 1405 /// Allow access to clients that need the byte representation, such as 1406 /// ASTWriterStmt::VisitStringLiteral(). 1407 StringRef getBytes() const { 1408 // FIXME: StringRef may not be the right type to use as a result for this. 1409 if (CharByteWidth == 1) 1410 return StringRef(StrData.asChar, getByteLength()); 1411 if (CharByteWidth == 4) 1412 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1413 getByteLength()); 1414 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1415 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1416 getByteLength()); 1417 } 1418 1419 void outputString(raw_ostream &OS); 1420 1421 uint32_t getCodeUnit(size_t i) const { 1422 assert(i < Length && "out of bounds access"); 1423 if (CharByteWidth == 1) 1424 return static_cast<unsigned char>(StrData.asChar[i]); 1425 if (CharByteWidth == 4) 1426 return StrData.asUInt32[i]; 1427 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1428 return StrData.asUInt16[i]; 1429 } 1430 1431 unsigned getByteLength() const { return CharByteWidth*Length; } 1432 unsigned getLength() const { return Length; } 1433 unsigned getCharByteWidth() const { return CharByteWidth; } 1434 1435 /// \brief Sets the string data to the given string data. 1436 void setString(ASTContext &C, StringRef Str, 1437 StringKind Kind, bool IsPascal); 1438 1439 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1440 1441 1442 bool isAscii() const { return Kind == Ascii; } 1443 bool isWide() const { return Kind == Wide; } 1444 bool isUTF8() const { return Kind == UTF8; } 1445 bool isUTF16() const { return Kind == UTF16; } 1446 bool isUTF32() const { return Kind == UTF32; } 1447 bool isPascal() const { return IsPascal; } 1448 1449 bool containsNonAsciiOrNull() const { 1450 StringRef Str = getString(); 1451 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1452 if (!isascii(Str[i]) || !Str[i]) 1453 return true; 1454 return false; 1455 } 1456 1457 /// getNumConcatenated - Get the number of string literal tokens that were 1458 /// concatenated in translation phase #6 to form this string literal. 1459 unsigned getNumConcatenated() const { return NumConcatenated; } 1460 1461 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1462 assert(TokNum < NumConcatenated && "Invalid tok number"); 1463 return TokLocs[TokNum]; 1464 } 1465 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1466 assert(TokNum < NumConcatenated && "Invalid tok number"); 1467 TokLocs[TokNum] = L; 1468 } 1469 1470 /// getLocationOfByte - Return a source location that points to the specified 1471 /// byte of this string literal. 1472 /// 1473 /// Strings are amazingly complex. They can be formed from multiple tokens 1474 /// and can have escape sequences in them in addition to the usual trigraph 1475 /// and escaped newline business. This routine handles this complexity. 1476 /// 1477 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1478 const LangOptions &Features, 1479 const TargetInfo &Target) const; 1480 1481 typedef const SourceLocation *tokloc_iterator; 1482 tokloc_iterator tokloc_begin() const { return TokLocs; } 1483 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1484 1485 SourceRange getSourceRange() const LLVM_READONLY { 1486 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1487 } 1488 static bool classof(const Stmt *T) { 1489 return T->getStmtClass() == StringLiteralClass; 1490 } 1491 static bool classof(const StringLiteral *) { return true; } 1492 1493 // Iterators 1494 child_range children() { return child_range(); } 1495}; 1496 1497/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1498/// AST node is only formed if full location information is requested. 1499class ParenExpr : public Expr { 1500 SourceLocation L, R; 1501 Stmt *Val; 1502public: 1503 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1504 : Expr(ParenExprClass, val->getType(), 1505 val->getValueKind(), val->getObjectKind(), 1506 val->isTypeDependent(), val->isValueDependent(), 1507 val->isInstantiationDependent(), 1508 val->containsUnexpandedParameterPack()), 1509 L(l), R(r), Val(val) {} 1510 1511 /// \brief Construct an empty parenthesized expression. 1512 explicit ParenExpr(EmptyShell Empty) 1513 : Expr(ParenExprClass, Empty) { } 1514 1515 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1516 Expr *getSubExpr() { return cast<Expr>(Val); } 1517 void setSubExpr(Expr *E) { Val = E; } 1518 1519 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(L, R); } 1520 1521 /// \brief Get the location of the left parentheses '('. 1522 SourceLocation getLParen() const { return L; } 1523 void setLParen(SourceLocation Loc) { L = Loc; } 1524 1525 /// \brief Get the location of the right parentheses ')'. 1526 SourceLocation getRParen() const { return R; } 1527 void setRParen(SourceLocation Loc) { R = Loc; } 1528 1529 static bool classof(const Stmt *T) { 1530 return T->getStmtClass() == ParenExprClass; 1531 } 1532 static bool classof(const ParenExpr *) { return true; } 1533 1534 // Iterators 1535 child_range children() { return child_range(&Val, &Val+1); } 1536}; 1537 1538 1539/// UnaryOperator - This represents the unary-expression's (except sizeof and 1540/// alignof), the postinc/postdec operators from postfix-expression, and various 1541/// extensions. 1542/// 1543/// Notes on various nodes: 1544/// 1545/// Real/Imag - These return the real/imag part of a complex operand. If 1546/// applied to a non-complex value, the former returns its operand and the 1547/// later returns zero in the type of the operand. 1548/// 1549class UnaryOperator : public Expr { 1550public: 1551 typedef UnaryOperatorKind Opcode; 1552 1553private: 1554 unsigned Opc : 5; 1555 SourceLocation Loc; 1556 Stmt *Val; 1557public: 1558 1559 UnaryOperator(Expr *input, Opcode opc, QualType type, 1560 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1561 : Expr(UnaryOperatorClass, type, VK, OK, 1562 input->isTypeDependent() || type->isDependentType(), 1563 input->isValueDependent(), 1564 (input->isInstantiationDependent() || 1565 type->isInstantiationDependentType()), 1566 input->containsUnexpandedParameterPack()), 1567 Opc(opc), Loc(l), Val(input) {} 1568 1569 /// \brief Build an empty unary operator. 1570 explicit UnaryOperator(EmptyShell Empty) 1571 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1572 1573 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1574 void setOpcode(Opcode O) { Opc = O; } 1575 1576 Expr *getSubExpr() const { return cast<Expr>(Val); } 1577 void setSubExpr(Expr *E) { Val = E; } 1578 1579 /// getOperatorLoc - Return the location of the operator. 1580 SourceLocation getOperatorLoc() const { return Loc; } 1581 void setOperatorLoc(SourceLocation L) { Loc = L; } 1582 1583 /// isPostfix - Return true if this is a postfix operation, like x++. 1584 static bool isPostfix(Opcode Op) { 1585 return Op == UO_PostInc || Op == UO_PostDec; 1586 } 1587 1588 /// isPrefix - Return true if this is a prefix operation, like --x. 1589 static bool isPrefix(Opcode Op) { 1590 return Op == UO_PreInc || Op == UO_PreDec; 1591 } 1592 1593 bool isPrefix() const { return isPrefix(getOpcode()); } 1594 bool isPostfix() const { return isPostfix(getOpcode()); } 1595 1596 static bool isIncrementOp(Opcode Op) { 1597 return Op == UO_PreInc || Op == UO_PostInc; 1598 } 1599 bool isIncrementOp() const { 1600 return isIncrementOp(getOpcode()); 1601 } 1602 1603 static bool isDecrementOp(Opcode Op) { 1604 return Op == UO_PreDec || Op == UO_PostDec; 1605 } 1606 bool isDecrementOp() const { 1607 return isDecrementOp(getOpcode()); 1608 } 1609 1610 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1611 bool isIncrementDecrementOp() const { 1612 return isIncrementDecrementOp(getOpcode()); 1613 } 1614 1615 static bool isArithmeticOp(Opcode Op) { 1616 return Op >= UO_Plus && Op <= UO_LNot; 1617 } 1618 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1619 1620 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1621 /// corresponds to, e.g. "sizeof" or "[pre]++" 1622 static const char *getOpcodeStr(Opcode Op); 1623 1624 /// \brief Retrieve the unary opcode that corresponds to the given 1625 /// overloaded operator. 1626 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1627 1628 /// \brief Retrieve the overloaded operator kind that corresponds to 1629 /// the given unary opcode. 1630 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1631 1632 SourceRange getSourceRange() const LLVM_READONLY { 1633 if (isPostfix()) 1634 return SourceRange(Val->getLocStart(), Loc); 1635 else 1636 return SourceRange(Loc, Val->getLocEnd()); 1637 } 1638 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; } 1639 1640 static bool classof(const Stmt *T) { 1641 return T->getStmtClass() == UnaryOperatorClass; 1642 } 1643 static bool classof(const UnaryOperator *) { return true; } 1644 1645 // Iterators 1646 child_range children() { return child_range(&Val, &Val+1); } 1647}; 1648 1649/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1650/// offsetof(record-type, member-designator). For example, given: 1651/// @code 1652/// struct S { 1653/// float f; 1654/// double d; 1655/// }; 1656/// struct T { 1657/// int i; 1658/// struct S s[10]; 1659/// }; 1660/// @endcode 1661/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1662 1663class OffsetOfExpr : public Expr { 1664public: 1665 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1666 class OffsetOfNode { 1667 public: 1668 /// \brief The kind of offsetof node we have. 1669 enum Kind { 1670 /// \brief An index into an array. 1671 Array = 0x00, 1672 /// \brief A field. 1673 Field = 0x01, 1674 /// \brief A field in a dependent type, known only by its name. 1675 Identifier = 0x02, 1676 /// \brief An implicit indirection through a C++ base class, when the 1677 /// field found is in a base class. 1678 Base = 0x03 1679 }; 1680 1681 private: 1682 enum { MaskBits = 2, Mask = 0x03 }; 1683 1684 /// \brief The source range that covers this part of the designator. 1685 SourceRange Range; 1686 1687 /// \brief The data describing the designator, which comes in three 1688 /// different forms, depending on the lower two bits. 1689 /// - An unsigned index into the array of Expr*'s stored after this node 1690 /// in memory, for [constant-expression] designators. 1691 /// - A FieldDecl*, for references to a known field. 1692 /// - An IdentifierInfo*, for references to a field with a given name 1693 /// when the class type is dependent. 1694 /// - A CXXBaseSpecifier*, for references that look at a field in a 1695 /// base class. 1696 uintptr_t Data; 1697 1698 public: 1699 /// \brief Create an offsetof node that refers to an array element. 1700 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1701 SourceLocation RBracketLoc) 1702 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1703 1704 /// \brief Create an offsetof node that refers to a field. 1705 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1706 SourceLocation NameLoc) 1707 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1708 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1709 1710 /// \brief Create an offsetof node that refers to an identifier. 1711 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1712 SourceLocation NameLoc) 1713 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1714 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1715 1716 /// \brief Create an offsetof node that refers into a C++ base class. 1717 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1718 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1719 1720 /// \brief Determine what kind of offsetof node this is. 1721 Kind getKind() const { 1722 return static_cast<Kind>(Data & Mask); 1723 } 1724 1725 /// \brief For an array element node, returns the index into the array 1726 /// of expressions. 1727 unsigned getArrayExprIndex() const { 1728 assert(getKind() == Array); 1729 return Data >> 2; 1730 } 1731 1732 /// \brief For a field offsetof node, returns the field. 1733 FieldDecl *getField() const { 1734 assert(getKind() == Field); 1735 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1736 } 1737 1738 /// \brief For a field or identifier offsetof node, returns the name of 1739 /// the field. 1740 IdentifierInfo *getFieldName() const; 1741 1742 /// \brief For a base class node, returns the base specifier. 1743 CXXBaseSpecifier *getBase() const { 1744 assert(getKind() == Base); 1745 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1746 } 1747 1748 /// \brief Retrieve the source range that covers this offsetof node. 1749 /// 1750 /// For an array element node, the source range contains the locations of 1751 /// the square brackets. For a field or identifier node, the source range 1752 /// contains the location of the period (if there is one) and the 1753 /// identifier. 1754 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 1755 }; 1756 1757private: 1758 1759 SourceLocation OperatorLoc, RParenLoc; 1760 // Base type; 1761 TypeSourceInfo *TSInfo; 1762 // Number of sub-components (i.e. instances of OffsetOfNode). 1763 unsigned NumComps; 1764 // Number of sub-expressions (i.e. array subscript expressions). 1765 unsigned NumExprs; 1766 1767 OffsetOfExpr(ASTContext &C, QualType type, 1768 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1769 OffsetOfNode* compsPtr, unsigned numComps, 1770 Expr** exprsPtr, unsigned numExprs, 1771 SourceLocation RParenLoc); 1772 1773 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1774 : Expr(OffsetOfExprClass, EmptyShell()), 1775 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1776 1777public: 1778 1779 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1780 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1781 OffsetOfNode* compsPtr, unsigned numComps, 1782 Expr** exprsPtr, unsigned numExprs, 1783 SourceLocation RParenLoc); 1784 1785 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1786 unsigned NumComps, unsigned NumExprs); 1787 1788 /// getOperatorLoc - Return the location of the operator. 1789 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1790 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1791 1792 /// \brief Return the location of the right parentheses. 1793 SourceLocation getRParenLoc() const { return RParenLoc; } 1794 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1795 1796 TypeSourceInfo *getTypeSourceInfo() const { 1797 return TSInfo; 1798 } 1799 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1800 TSInfo = tsi; 1801 } 1802 1803 const OffsetOfNode &getComponent(unsigned Idx) const { 1804 assert(Idx < NumComps && "Subscript out of range"); 1805 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1806 } 1807 1808 void setComponent(unsigned Idx, OffsetOfNode ON) { 1809 assert(Idx < NumComps && "Subscript out of range"); 1810 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1811 } 1812 1813 unsigned getNumComponents() const { 1814 return NumComps; 1815 } 1816 1817 Expr* getIndexExpr(unsigned Idx) { 1818 assert(Idx < NumExprs && "Subscript out of range"); 1819 return reinterpret_cast<Expr **>( 1820 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1821 } 1822 const Expr *getIndexExpr(unsigned Idx) const { 1823 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1824 } 1825 1826 void setIndexExpr(unsigned Idx, Expr* E) { 1827 assert(Idx < NumComps && "Subscript out of range"); 1828 reinterpret_cast<Expr **>( 1829 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1830 } 1831 1832 unsigned getNumExpressions() const { 1833 return NumExprs; 1834 } 1835 1836 SourceRange getSourceRange() const LLVM_READONLY { 1837 return SourceRange(OperatorLoc, RParenLoc); 1838 } 1839 1840 static bool classof(const Stmt *T) { 1841 return T->getStmtClass() == OffsetOfExprClass; 1842 } 1843 1844 static bool classof(const OffsetOfExpr *) { return true; } 1845 1846 // Iterators 1847 child_range children() { 1848 Stmt **begin = 1849 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1850 + NumComps); 1851 return child_range(begin, begin + NumExprs); 1852 } 1853}; 1854 1855/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1856/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1857/// vec_step (OpenCL 1.1 6.11.12). 1858class UnaryExprOrTypeTraitExpr : public Expr { 1859 union { 1860 TypeSourceInfo *Ty; 1861 Stmt *Ex; 1862 } Argument; 1863 SourceLocation OpLoc, RParenLoc; 1864 1865public: 1866 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 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 TInfo->getType()->isDependentType(), 1873 TInfo->getType()->isInstantiationDependentType(), 1874 TInfo->getType()->containsUnexpandedParameterPack()), 1875 OpLoc(op), RParenLoc(rp) { 1876 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1877 UnaryExprOrTypeTraitExprBits.IsType = true; 1878 Argument.Ty = TInfo; 1879 } 1880 1881 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1882 QualType resultType, SourceLocation op, 1883 SourceLocation rp) : 1884 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1885 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1886 // Value-dependent if the argument is type-dependent. 1887 E->isTypeDependent(), 1888 E->isInstantiationDependent(), 1889 E->containsUnexpandedParameterPack()), 1890 OpLoc(op), RParenLoc(rp) { 1891 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1892 UnaryExprOrTypeTraitExprBits.IsType = false; 1893 Argument.Ex = E; 1894 } 1895 1896 /// \brief Construct an empty sizeof/alignof expression. 1897 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1898 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1899 1900 UnaryExprOrTypeTrait getKind() const { 1901 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind); 1902 } 1903 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;} 1904 1905 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; } 1906 QualType getArgumentType() const { 1907 return getArgumentTypeInfo()->getType(); 1908 } 1909 TypeSourceInfo *getArgumentTypeInfo() const { 1910 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1911 return Argument.Ty; 1912 } 1913 Expr *getArgumentExpr() { 1914 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1915 return static_cast<Expr*>(Argument.Ex); 1916 } 1917 const Expr *getArgumentExpr() const { 1918 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1919 } 1920 1921 void setArgument(Expr *E) { 1922 Argument.Ex = E; 1923 UnaryExprOrTypeTraitExprBits.IsType = false; 1924 } 1925 void setArgument(TypeSourceInfo *TInfo) { 1926 Argument.Ty = TInfo; 1927 UnaryExprOrTypeTraitExprBits.IsType = true; 1928 } 1929 1930 /// Gets the argument type, or the type of the argument expression, whichever 1931 /// is appropriate. 1932 QualType getTypeOfArgument() const { 1933 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1934 } 1935 1936 SourceLocation getOperatorLoc() const { return OpLoc; } 1937 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1938 1939 SourceLocation getRParenLoc() const { return RParenLoc; } 1940 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1941 1942 SourceRange getSourceRange() const LLVM_READONLY { 1943 return SourceRange(OpLoc, RParenLoc); 1944 } 1945 1946 static bool classof(const Stmt *T) { 1947 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1948 } 1949 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1950 1951 // Iterators 1952 child_range children(); 1953}; 1954 1955//===----------------------------------------------------------------------===// 1956// Postfix Operators. 1957//===----------------------------------------------------------------------===// 1958 1959/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1960class ArraySubscriptExpr : public Expr { 1961 enum { LHS, RHS, END_EXPR=2 }; 1962 Stmt* SubExprs[END_EXPR]; 1963 SourceLocation RBracketLoc; 1964public: 1965 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1966 ExprValueKind VK, ExprObjectKind OK, 1967 SourceLocation rbracketloc) 1968 : Expr(ArraySubscriptExprClass, t, VK, OK, 1969 lhs->isTypeDependent() || rhs->isTypeDependent(), 1970 lhs->isValueDependent() || rhs->isValueDependent(), 1971 (lhs->isInstantiationDependent() || 1972 rhs->isInstantiationDependent()), 1973 (lhs->containsUnexpandedParameterPack() || 1974 rhs->containsUnexpandedParameterPack())), 1975 RBracketLoc(rbracketloc) { 1976 SubExprs[LHS] = lhs; 1977 SubExprs[RHS] = rhs; 1978 } 1979 1980 /// \brief Create an empty array subscript expression. 1981 explicit ArraySubscriptExpr(EmptyShell Shell) 1982 : Expr(ArraySubscriptExprClass, Shell) { } 1983 1984 /// An array access can be written A[4] or 4[A] (both are equivalent). 1985 /// - getBase() and getIdx() always present the normalized view: A[4]. 1986 /// In this case getBase() returns "A" and getIdx() returns "4". 1987 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1988 /// 4[A] getLHS() returns "4". 1989 /// Note: Because vector element access is also written A[4] we must 1990 /// predicate the format conversion in getBase and getIdx only on the 1991 /// the type of the RHS, as it is possible for the LHS to be a vector of 1992 /// integer type 1993 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1994 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1995 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1996 1997 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1998 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1999 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2000 2001 Expr *getBase() { 2002 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 2003 } 2004 2005 const Expr *getBase() const { 2006 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 2007 } 2008 2009 Expr *getIdx() { 2010 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2011 } 2012 2013 const Expr *getIdx() const { 2014 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2015 } 2016 2017 SourceRange getSourceRange() const LLVM_READONLY { 2018 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 2019 } 2020 2021 SourceLocation getRBracketLoc() const { return RBracketLoc; } 2022 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 2023 2024 SourceLocation getExprLoc() const LLVM_READONLY { return getBase()->getExprLoc(); } 2025 2026 static bool classof(const Stmt *T) { 2027 return T->getStmtClass() == ArraySubscriptExprClass; 2028 } 2029 static bool classof(const ArraySubscriptExpr *) { return true; } 2030 2031 // Iterators 2032 child_range children() { 2033 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2034 } 2035}; 2036 2037 2038/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 2039/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 2040/// while its subclasses may represent alternative syntax that (semantically) 2041/// results in a function call. For example, CXXOperatorCallExpr is 2042/// a subclass for overloaded operator calls that use operator syntax, e.g., 2043/// "str1 + str2" to resolve to a function call. 2044class CallExpr : public Expr { 2045 enum { FN=0, PREARGS_START=1 }; 2046 Stmt **SubExprs; 2047 unsigned NumArgs; 2048 SourceLocation RParenLoc; 2049 2050protected: 2051 // These versions of the constructor are for derived classes. 2052 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 2053 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 2054 SourceLocation rparenloc); 2055 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 2056 2057 Stmt *getPreArg(unsigned i) { 2058 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2059 return SubExprs[PREARGS_START+i]; 2060 } 2061 const Stmt *getPreArg(unsigned i) const { 2062 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2063 return SubExprs[PREARGS_START+i]; 2064 } 2065 void setPreArg(unsigned i, Stmt *PreArg) { 2066 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2067 SubExprs[PREARGS_START+i] = PreArg; 2068 } 2069 2070 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2071 2072public: 2073 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 2074 ExprValueKind VK, SourceLocation rparenloc); 2075 2076 /// \brief Build an empty call expression. 2077 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 2078 2079 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2080 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2081 void setCallee(Expr *F) { SubExprs[FN] = F; } 2082 2083 Decl *getCalleeDecl(); 2084 const Decl *getCalleeDecl() const { 2085 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2086 } 2087 2088 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2089 FunctionDecl *getDirectCallee(); 2090 const FunctionDecl *getDirectCallee() const { 2091 return const_cast<CallExpr*>(this)->getDirectCallee(); 2092 } 2093 2094 /// getNumArgs - Return the number of actual arguments to this call. 2095 /// 2096 unsigned getNumArgs() const { return NumArgs; } 2097 2098 /// \brief Retrieve the call arguments. 2099 Expr **getArgs() { 2100 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2101 } 2102 const Expr *const *getArgs() const { 2103 return const_cast<CallExpr*>(this)->getArgs(); 2104 } 2105 2106 /// getArg - Return the specified argument. 2107 Expr *getArg(unsigned Arg) { 2108 assert(Arg < NumArgs && "Arg access out of range!"); 2109 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2110 } 2111 const Expr *getArg(unsigned Arg) const { 2112 assert(Arg < NumArgs && "Arg access out of range!"); 2113 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2114 } 2115 2116 /// setArg - Set the specified argument. 2117 void setArg(unsigned Arg, Expr *ArgExpr) { 2118 assert(Arg < NumArgs && "Arg access out of range!"); 2119 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2120 } 2121 2122 /// setNumArgs - This changes the number of arguments present in this call. 2123 /// Any orphaned expressions are deleted by this, and any new operands are set 2124 /// to null. 2125 void setNumArgs(ASTContext& C, unsigned NumArgs); 2126 2127 typedef ExprIterator arg_iterator; 2128 typedef ConstExprIterator const_arg_iterator; 2129 2130 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2131 arg_iterator arg_end() { 2132 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2133 } 2134 const_arg_iterator arg_begin() const { 2135 return SubExprs+PREARGS_START+getNumPreArgs(); 2136 } 2137 const_arg_iterator arg_end() const { 2138 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2139 } 2140 2141 /// getNumCommas - Return the number of commas that must have been present in 2142 /// this function call. 2143 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2144 2145 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2146 /// not, return 0. 2147 unsigned isBuiltinCall() const; 2148 2149 /// getCallReturnType - Get the return type of the call expr. This is not 2150 /// always the type of the expr itself, if the return type is a reference 2151 /// type. 2152 QualType getCallReturnType() const; 2153 2154 SourceLocation getRParenLoc() const { return RParenLoc; } 2155 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2156 2157 SourceRange getSourceRange() const LLVM_READONLY; 2158 SourceLocation getLocStart() const LLVM_READONLY; 2159 SourceLocation getLocEnd() const LLVM_READONLY; 2160 2161 static bool classof(const Stmt *T) { 2162 return T->getStmtClass() >= firstCallExprConstant && 2163 T->getStmtClass() <= lastCallExprConstant; 2164 } 2165 static bool classof(const CallExpr *) { return true; } 2166 2167 // Iterators 2168 child_range children() { 2169 return child_range(&SubExprs[0], 2170 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2171 } 2172}; 2173 2174/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2175/// 2176class MemberExpr : public Expr { 2177 /// Extra data stored in some member expressions. 2178 struct MemberNameQualifier { 2179 /// \brief The nested-name-specifier that qualifies the name, including 2180 /// source-location information. 2181 NestedNameSpecifierLoc QualifierLoc; 2182 2183 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2184 /// name qualifiers. 2185 DeclAccessPair FoundDecl; 2186 }; 2187 2188 /// Base - the expression for the base pointer or structure references. In 2189 /// X.F, this is "X". 2190 Stmt *Base; 2191 2192 /// MemberDecl - This is the decl being referenced by the field/member name. 2193 /// In X.F, this is the decl referenced by F. 2194 ValueDecl *MemberDecl; 2195 2196 /// MemberDNLoc - Provides source/type location info for the 2197 /// declaration name embedded in MemberDecl. 2198 DeclarationNameLoc MemberDNLoc; 2199 2200 /// MemberLoc - This is the location of the member name. 2201 SourceLocation MemberLoc; 2202 2203 /// IsArrow - True if this is "X->F", false if this is "X.F". 2204 bool IsArrow : 1; 2205 2206 /// \brief True if this member expression used a nested-name-specifier to 2207 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2208 /// declaration. When true, a MemberNameQualifier 2209 /// structure is allocated immediately after the MemberExpr. 2210 bool HasQualifierOrFoundDecl : 1; 2211 2212 /// \brief True if this member expression specified a template keyword 2213 /// and/or a template argument list explicitly, e.g., x->f<int>, 2214 /// x->template f, x->template f<int>. 2215 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2216 /// TemplateArguments (if any) are allocated immediately after 2217 /// the MemberExpr or, if the member expression also has a qualifier, 2218 /// after the MemberNameQualifier structure. 2219 bool HasTemplateKWAndArgsInfo : 1; 2220 2221 /// \brief True if this member expression refers to a method that 2222 /// was resolved from an overloaded set having size greater than 1. 2223 bool HadMultipleCandidates : 1; 2224 2225 /// \brief Retrieve the qualifier that preceded the member name, if any. 2226 MemberNameQualifier *getMemberQualifier() { 2227 assert(HasQualifierOrFoundDecl); 2228 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2229 } 2230 2231 /// \brief Retrieve the qualifier that preceded the member name, if any. 2232 const MemberNameQualifier *getMemberQualifier() const { 2233 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2234 } 2235 2236public: 2237 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2238 const DeclarationNameInfo &NameInfo, QualType ty, 2239 ExprValueKind VK, ExprObjectKind OK) 2240 : Expr(MemberExprClass, ty, VK, OK, 2241 base->isTypeDependent(), 2242 base->isValueDependent(), 2243 base->isInstantiationDependent(), 2244 base->containsUnexpandedParameterPack()), 2245 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()), 2246 MemberLoc(NameInfo.getLoc()), IsArrow(isarrow), 2247 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2248 HadMultipleCandidates(false) { 2249 assert(memberdecl->getDeclName() == NameInfo.getName()); 2250 } 2251 2252 // NOTE: this constructor should be used only when it is known that 2253 // the member name can not provide additional syntactic info 2254 // (i.e., source locations for C++ operator names or type source info 2255 // for constructors, destructors and conversion operators). 2256 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2257 SourceLocation l, QualType ty, 2258 ExprValueKind VK, ExprObjectKind OK) 2259 : Expr(MemberExprClass, ty, VK, OK, 2260 base->isTypeDependent(), base->isValueDependent(), 2261 base->isInstantiationDependent(), 2262 base->containsUnexpandedParameterPack()), 2263 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l), 2264 IsArrow(isarrow), 2265 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2266 HadMultipleCandidates(false) {} 2267 2268 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2269 NestedNameSpecifierLoc QualifierLoc, 2270 SourceLocation TemplateKWLoc, 2271 ValueDecl *memberdecl, DeclAccessPair founddecl, 2272 DeclarationNameInfo MemberNameInfo, 2273 const TemplateArgumentListInfo *targs, 2274 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2275 2276 void setBase(Expr *E) { Base = E; } 2277 Expr *getBase() const { return cast<Expr>(Base); } 2278 2279 /// \brief Retrieve the member declaration to which this expression refers. 2280 /// 2281 /// The returned declaration will either be a FieldDecl or (in C++) 2282 /// a CXXMethodDecl. 2283 ValueDecl *getMemberDecl() const { return MemberDecl; } 2284 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2285 2286 /// \brief Retrieves the declaration found by lookup. 2287 DeclAccessPair getFoundDecl() const { 2288 if (!HasQualifierOrFoundDecl) 2289 return DeclAccessPair::make(getMemberDecl(), 2290 getMemberDecl()->getAccess()); 2291 return getMemberQualifier()->FoundDecl; 2292 } 2293 2294 /// \brief Determines whether this member expression actually had 2295 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2296 /// x->Base::foo. 2297 bool hasQualifier() const { return getQualifier() != 0; } 2298 2299 /// \brief If the member name was qualified, retrieves the 2300 /// nested-name-specifier that precedes the member name. Otherwise, returns 2301 /// NULL. 2302 NestedNameSpecifier *getQualifier() const { 2303 if (!HasQualifierOrFoundDecl) 2304 return 0; 2305 2306 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2307 } 2308 2309 /// \brief If the member name was qualified, retrieves the 2310 /// nested-name-specifier that precedes the member name, with source-location 2311 /// information. 2312 NestedNameSpecifierLoc getQualifierLoc() const { 2313 if (!hasQualifier()) 2314 return NestedNameSpecifierLoc(); 2315 2316 return getMemberQualifier()->QualifierLoc; 2317 } 2318 2319 /// \brief Return the optional template keyword and arguments info. 2320 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 2321 if (!HasTemplateKWAndArgsInfo) 2322 return 0; 2323 2324 if (!HasQualifierOrFoundDecl) 2325 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 2326 2327 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 2328 getMemberQualifier() + 1); 2329 } 2330 2331 /// \brief Return the optional template keyword and arguments info. 2332 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 2333 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo(); 2334 } 2335 2336 /// \brief Retrieve the location of the template keyword preceding 2337 /// the member name, if any. 2338 SourceLocation getTemplateKeywordLoc() const { 2339 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2340 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 2341 } 2342 2343 /// \brief Retrieve the location of the left angle bracket starting the 2344 /// explicit template argument list following the member name, if any. 2345 SourceLocation getLAngleLoc() const { 2346 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2347 return getTemplateKWAndArgsInfo()->LAngleLoc; 2348 } 2349 2350 /// \brief Retrieve the location of the right angle bracket ending the 2351 /// explicit template argument list following the member name, if any. 2352 SourceLocation getRAngleLoc() const { 2353 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2354 return getTemplateKWAndArgsInfo()->RAngleLoc; 2355 } 2356 2357 /// Determines whether the member name was preceded by the template keyword. 2358 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2359 2360 /// \brief Determines whether the member name was followed by an 2361 /// explicit template argument list. 2362 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2363 2364 /// \brief Copies the template arguments (if present) into the given 2365 /// structure. 2366 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2367 if (hasExplicitTemplateArgs()) 2368 getExplicitTemplateArgs().copyInto(List); 2369 } 2370 2371 /// \brief Retrieve the explicit template argument list that 2372 /// follow the member template name. This must only be called on an 2373 /// expression with explicit template arguments. 2374 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2375 assert(hasExplicitTemplateArgs()); 2376 return *getTemplateKWAndArgsInfo(); 2377 } 2378 2379 /// \brief Retrieve the explicit template argument list that 2380 /// followed the member template name. This must only be called on 2381 /// an expression with explicit template arguments. 2382 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2383 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2384 } 2385 2386 /// \brief Retrieves the optional explicit template arguments. 2387 /// This points to the same data as getExplicitTemplateArgs(), but 2388 /// returns null if there are no explicit template arguments. 2389 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2390 if (!hasExplicitTemplateArgs()) return 0; 2391 return &getExplicitTemplateArgs(); 2392 } 2393 2394 /// \brief Retrieve the template arguments provided as part of this 2395 /// template-id. 2396 const TemplateArgumentLoc *getTemplateArgs() const { 2397 if (!hasExplicitTemplateArgs()) 2398 return 0; 2399 2400 return getExplicitTemplateArgs().getTemplateArgs(); 2401 } 2402 2403 /// \brief Retrieve the number of template arguments provided as part of this 2404 /// template-id. 2405 unsigned getNumTemplateArgs() const { 2406 if (!hasExplicitTemplateArgs()) 2407 return 0; 2408 2409 return getExplicitTemplateArgs().NumTemplateArgs; 2410 } 2411 2412 /// \brief Retrieve the member declaration name info. 2413 DeclarationNameInfo getMemberNameInfo() const { 2414 return DeclarationNameInfo(MemberDecl->getDeclName(), 2415 MemberLoc, MemberDNLoc); 2416 } 2417 2418 bool isArrow() const { return IsArrow; } 2419 void setArrow(bool A) { IsArrow = A; } 2420 2421 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2422 /// location of 'F'. 2423 SourceLocation getMemberLoc() const { return MemberLoc; } 2424 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2425 2426 SourceRange getSourceRange() const LLVM_READONLY; 2427 SourceLocation getLocStart() const LLVM_READONLY; 2428 SourceLocation getLocEnd() const LLVM_READONLY; 2429 2430 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; } 2431 2432 /// \brief Determine whether the base of this explicit is implicit. 2433 bool isImplicitAccess() const { 2434 return getBase() && getBase()->isImplicitCXXThis(); 2435 } 2436 2437 /// \brief Returns true if this member expression refers to a method that 2438 /// was resolved from an overloaded set having size greater than 1. 2439 bool hadMultipleCandidates() const { 2440 return HadMultipleCandidates; 2441 } 2442 /// \brief Sets the flag telling whether this expression refers to 2443 /// a method that was resolved from an overloaded set having size 2444 /// greater than 1. 2445 void setHadMultipleCandidates(bool V = true) { 2446 HadMultipleCandidates = V; 2447 } 2448 2449 static bool classof(const Stmt *T) { 2450 return T->getStmtClass() == MemberExprClass; 2451 } 2452 static bool classof(const MemberExpr *) { return true; } 2453 2454 // Iterators 2455 child_range children() { return child_range(&Base, &Base+1); } 2456 2457 friend class ASTReader; 2458 friend class ASTStmtWriter; 2459}; 2460 2461/// CompoundLiteralExpr - [C99 6.5.2.5] 2462/// 2463class CompoundLiteralExpr : public Expr { 2464 /// LParenLoc - If non-null, this is the location of the left paren in a 2465 /// compound literal like "(int){4}". This can be null if this is a 2466 /// synthesized compound expression. 2467 SourceLocation LParenLoc; 2468 2469 /// The type as written. This can be an incomplete array type, in 2470 /// which case the actual expression type will be different. 2471 /// The int part of the pair stores whether this expr is file scope. 2472 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope; 2473 Stmt *Init; 2474public: 2475 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2476 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2477 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2478 tinfo->getType()->isDependentType(), 2479 init->isValueDependent(), 2480 (init->isInstantiationDependent() || 2481 tinfo->getType()->isInstantiationDependentType()), 2482 init->containsUnexpandedParameterPack()), 2483 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {} 2484 2485 /// \brief Construct an empty compound literal. 2486 explicit CompoundLiteralExpr(EmptyShell Empty) 2487 : Expr(CompoundLiteralExprClass, Empty) { } 2488 2489 const Expr *getInitializer() const { return cast<Expr>(Init); } 2490 Expr *getInitializer() { return cast<Expr>(Init); } 2491 void setInitializer(Expr *E) { Init = E; } 2492 2493 bool isFileScope() const { return TInfoAndScope.getInt(); } 2494 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); } 2495 2496 SourceLocation getLParenLoc() const { return LParenLoc; } 2497 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2498 2499 TypeSourceInfo *getTypeSourceInfo() const { 2500 return TInfoAndScope.getPointer(); 2501 } 2502 void setTypeSourceInfo(TypeSourceInfo *tinfo) { 2503 TInfoAndScope.setPointer(tinfo); 2504 } 2505 2506 SourceRange getSourceRange() const LLVM_READONLY { 2507 // FIXME: Init should never be null. 2508 if (!Init) 2509 return SourceRange(); 2510 if (LParenLoc.isInvalid()) 2511 return Init->getSourceRange(); 2512 return SourceRange(LParenLoc, Init->getLocEnd()); 2513 } 2514 2515 static bool classof(const Stmt *T) { 2516 return T->getStmtClass() == CompoundLiteralExprClass; 2517 } 2518 static bool classof(const CompoundLiteralExpr *) { return true; } 2519 2520 // Iterators 2521 child_range children() { return child_range(&Init, &Init+1); } 2522}; 2523 2524/// CastExpr - Base class for type casts, including both implicit 2525/// casts (ImplicitCastExpr) and explicit casts that have some 2526/// representation in the source code (ExplicitCastExpr's derived 2527/// classes). 2528class CastExpr : public Expr { 2529public: 2530 typedef clang::CastKind CastKind; 2531 2532private: 2533 Stmt *Op; 2534 2535 void CheckCastConsistency() const; 2536 2537 const CXXBaseSpecifier * const *path_buffer() const { 2538 return const_cast<CastExpr*>(this)->path_buffer(); 2539 } 2540 CXXBaseSpecifier **path_buffer(); 2541 2542 void setBasePathSize(unsigned basePathSize) { 2543 CastExprBits.BasePathSize = basePathSize; 2544 assert(CastExprBits.BasePathSize == basePathSize && 2545 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2546 } 2547 2548protected: 2549 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2550 const CastKind kind, Expr *op, unsigned BasePathSize) : 2551 Expr(SC, ty, VK, OK_Ordinary, 2552 // Cast expressions are type-dependent if the type is 2553 // dependent (C++ [temp.dep.expr]p3). 2554 ty->isDependentType(), 2555 // Cast expressions are value-dependent if the type is 2556 // dependent or if the subexpression is value-dependent. 2557 ty->isDependentType() || (op && op->isValueDependent()), 2558 (ty->isInstantiationDependentType() || 2559 (op && op->isInstantiationDependent())), 2560 (ty->containsUnexpandedParameterPack() || 2561 op->containsUnexpandedParameterPack())), 2562 Op(op) { 2563 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2564 CastExprBits.Kind = kind; 2565 setBasePathSize(BasePathSize); 2566#ifndef NDEBUG 2567 CheckCastConsistency(); 2568#endif 2569 } 2570 2571 /// \brief Construct an empty cast. 2572 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2573 : Expr(SC, Empty) { 2574 setBasePathSize(BasePathSize); 2575 } 2576 2577public: 2578 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2579 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2580 const char *getCastKindName() const; 2581 2582 Expr *getSubExpr() { return cast<Expr>(Op); } 2583 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2584 void setSubExpr(Expr *E) { Op = E; } 2585 2586 /// \brief Retrieve the cast subexpression as it was written in the source 2587 /// code, looking through any implicit casts or other intermediate nodes 2588 /// introduced by semantic analysis. 2589 Expr *getSubExprAsWritten(); 2590 const Expr *getSubExprAsWritten() const { 2591 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2592 } 2593 2594 typedef CXXBaseSpecifier **path_iterator; 2595 typedef const CXXBaseSpecifier * const *path_const_iterator; 2596 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2597 unsigned path_size() const { return CastExprBits.BasePathSize; } 2598 path_iterator path_begin() { return path_buffer(); } 2599 path_iterator path_end() { return path_buffer() + path_size(); } 2600 path_const_iterator path_begin() const { return path_buffer(); } 2601 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2602 2603 void setCastPath(const CXXCastPath &Path); 2604 2605 static bool classof(const Stmt *T) { 2606 return T->getStmtClass() >= firstCastExprConstant && 2607 T->getStmtClass() <= lastCastExprConstant; 2608 } 2609 static bool classof(const CastExpr *) { return true; } 2610 2611 // Iterators 2612 child_range children() { return child_range(&Op, &Op+1); } 2613}; 2614 2615/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2616/// conversions, which have no direct representation in the original 2617/// source code. For example: converting T[]->T*, void f()->void 2618/// (*f)(), float->double, short->int, etc. 2619/// 2620/// In C, implicit casts always produce rvalues. However, in C++, an 2621/// implicit cast whose result is being bound to a reference will be 2622/// an lvalue or xvalue. For example: 2623/// 2624/// @code 2625/// class Base { }; 2626/// class Derived : public Base { }; 2627/// Derived &&ref(); 2628/// void f(Derived d) { 2629/// Base& b = d; // initializer is an ImplicitCastExpr 2630/// // to an lvalue of type Base 2631/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2632/// // to an xvalue of type Base 2633/// } 2634/// @endcode 2635class ImplicitCastExpr : public CastExpr { 2636private: 2637 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2638 unsigned BasePathLength, ExprValueKind VK) 2639 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2640 } 2641 2642 /// \brief Construct an empty implicit cast. 2643 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2644 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2645 2646public: 2647 enum OnStack_t { OnStack }; 2648 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2649 ExprValueKind VK) 2650 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2651 } 2652 2653 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2654 CastKind Kind, Expr *Operand, 2655 const CXXCastPath *BasePath, 2656 ExprValueKind Cat); 2657 2658 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2659 2660 SourceRange getSourceRange() const LLVM_READONLY { 2661 return getSubExpr()->getSourceRange(); 2662 } 2663 SourceLocation getLocStart() const LLVM_READONLY { 2664 return getSubExpr()->getLocStart(); 2665 } 2666 SourceLocation getLocEnd() const LLVM_READONLY { 2667 return getSubExpr()->getLocEnd(); 2668 } 2669 2670 static bool classof(const Stmt *T) { 2671 return T->getStmtClass() == ImplicitCastExprClass; 2672 } 2673 static bool classof(const ImplicitCastExpr *) { return true; } 2674}; 2675 2676inline Expr *Expr::IgnoreImpCasts() { 2677 Expr *e = this; 2678 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2679 e = ice->getSubExpr(); 2680 return e; 2681} 2682 2683/// ExplicitCastExpr - An explicit cast written in the source 2684/// code. 2685/// 2686/// This class is effectively an abstract class, because it provides 2687/// the basic representation of an explicitly-written cast without 2688/// specifying which kind of cast (C cast, functional cast, static 2689/// cast, etc.) was written; specific derived classes represent the 2690/// particular style of cast and its location information. 2691/// 2692/// Unlike implicit casts, explicit cast nodes have two different 2693/// types: the type that was written into the source code, and the 2694/// actual type of the expression as determined by semantic 2695/// analysis. These types may differ slightly. For example, in C++ one 2696/// can cast to a reference type, which indicates that the resulting 2697/// expression will be an lvalue or xvalue. The reference type, however, 2698/// will not be used as the type of the expression. 2699class ExplicitCastExpr : public CastExpr { 2700 /// TInfo - Source type info for the (written) type 2701 /// this expression is casting to. 2702 TypeSourceInfo *TInfo; 2703 2704protected: 2705 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2706 CastKind kind, Expr *op, unsigned PathSize, 2707 TypeSourceInfo *writtenTy) 2708 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2709 2710 /// \brief Construct an empty explicit cast. 2711 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2712 : CastExpr(SC, Shell, PathSize) { } 2713 2714public: 2715 /// getTypeInfoAsWritten - Returns the type source info for the type 2716 /// that this expression is casting to. 2717 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2718 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2719 2720 /// getTypeAsWritten - Returns the type that this expression is 2721 /// casting to, as written in the source code. 2722 QualType getTypeAsWritten() const { return TInfo->getType(); } 2723 2724 static bool classof(const Stmt *T) { 2725 return T->getStmtClass() >= firstExplicitCastExprConstant && 2726 T->getStmtClass() <= lastExplicitCastExprConstant; 2727 } 2728 static bool classof(const ExplicitCastExpr *) { return true; } 2729}; 2730 2731/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2732/// cast in C++ (C++ [expr.cast]), which uses the syntax 2733/// (Type)expr. For example: @c (int)f. 2734class CStyleCastExpr : public ExplicitCastExpr { 2735 SourceLocation LPLoc; // the location of the left paren 2736 SourceLocation RPLoc; // the location of the right paren 2737 2738 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2739 unsigned PathSize, TypeSourceInfo *writtenTy, 2740 SourceLocation l, SourceLocation r) 2741 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2742 writtenTy), LPLoc(l), RPLoc(r) {} 2743 2744 /// \brief Construct an empty C-style explicit cast. 2745 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2746 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2747 2748public: 2749 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2750 ExprValueKind VK, CastKind K, 2751 Expr *Op, const CXXCastPath *BasePath, 2752 TypeSourceInfo *WrittenTy, SourceLocation L, 2753 SourceLocation R); 2754 2755 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2756 2757 SourceLocation getLParenLoc() const { return LPLoc; } 2758 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2759 2760 SourceLocation getRParenLoc() const { return RPLoc; } 2761 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2762 2763 SourceRange getSourceRange() const LLVM_READONLY { 2764 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2765 } 2766 static bool classof(const Stmt *T) { 2767 return T->getStmtClass() == CStyleCastExprClass; 2768 } 2769 static bool classof(const CStyleCastExpr *) { return true; } 2770}; 2771 2772/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2773/// 2774/// This expression node kind describes a builtin binary operation, 2775/// such as "x + y" for integer values "x" and "y". The operands will 2776/// already have been converted to appropriate types (e.g., by 2777/// performing promotions or conversions). 2778/// 2779/// In C++, where operators may be overloaded, a different kind of 2780/// expression node (CXXOperatorCallExpr) is used to express the 2781/// invocation of an overloaded operator with operator syntax. Within 2782/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2783/// used to store an expression "x + y" depends on the subexpressions 2784/// for x and y. If neither x or y is type-dependent, and the "+" 2785/// operator resolves to a built-in operation, BinaryOperator will be 2786/// used to express the computation (x and y may still be 2787/// value-dependent). If either x or y is type-dependent, or if the 2788/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2789/// be used to express the computation. 2790class BinaryOperator : public Expr { 2791public: 2792 typedef BinaryOperatorKind Opcode; 2793 2794private: 2795 unsigned Opc : 6; 2796 SourceLocation OpLoc; 2797 2798 enum { LHS, RHS, END_EXPR }; 2799 Stmt* SubExprs[END_EXPR]; 2800public: 2801 2802 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2803 ExprValueKind VK, ExprObjectKind OK, 2804 SourceLocation opLoc) 2805 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2806 lhs->isTypeDependent() || rhs->isTypeDependent(), 2807 lhs->isValueDependent() || rhs->isValueDependent(), 2808 (lhs->isInstantiationDependent() || 2809 rhs->isInstantiationDependent()), 2810 (lhs->containsUnexpandedParameterPack() || 2811 rhs->containsUnexpandedParameterPack())), 2812 Opc(opc), OpLoc(opLoc) { 2813 SubExprs[LHS] = lhs; 2814 SubExprs[RHS] = rhs; 2815 assert(!isCompoundAssignmentOp() && 2816 "Use ArithAssignBinaryOperator for compound assignments"); 2817 } 2818 2819 /// \brief Construct an empty binary operator. 2820 explicit BinaryOperator(EmptyShell Empty) 2821 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2822 2823 SourceLocation getExprLoc() const LLVM_READONLY { return OpLoc; } 2824 SourceLocation getOperatorLoc() const { return OpLoc; } 2825 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2826 2827 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2828 void setOpcode(Opcode O) { Opc = O; } 2829 2830 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2831 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2832 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2833 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2834 2835 SourceRange getSourceRange() const LLVM_READONLY { 2836 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2837 } 2838 2839 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2840 /// corresponds to, e.g. "<<=". 2841 static const char *getOpcodeStr(Opcode Op); 2842 2843 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2844 2845 /// \brief Retrieve the binary opcode that corresponds to the given 2846 /// overloaded operator. 2847 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2848 2849 /// \brief Retrieve the overloaded operator kind that corresponds to 2850 /// the given binary opcode. 2851 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2852 2853 /// predicates to categorize the respective opcodes. 2854 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2855 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2856 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2857 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2858 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2859 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2860 2861 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2862 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2863 2864 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2865 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2866 2867 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2868 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2869 2870 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2871 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2872 2873 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2874 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2875 2876 static bool isAssignmentOp(Opcode Opc) { 2877 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2878 } 2879 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2880 2881 static bool isCompoundAssignmentOp(Opcode Opc) { 2882 return Opc > BO_Assign && Opc <= BO_OrAssign; 2883 } 2884 bool isCompoundAssignmentOp() const { 2885 return isCompoundAssignmentOp(getOpcode()); 2886 } 2887 static Opcode getOpForCompoundAssignment(Opcode Opc) { 2888 assert(isCompoundAssignmentOp(Opc)); 2889 if (Opc >= BO_AndAssign) 2890 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 2891 else 2892 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 2893 } 2894 2895 static bool isShiftAssignOp(Opcode Opc) { 2896 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2897 } 2898 bool isShiftAssignOp() const { 2899 return isShiftAssignOp(getOpcode()); 2900 } 2901 2902 static bool classof(const Stmt *S) { 2903 return S->getStmtClass() >= firstBinaryOperatorConstant && 2904 S->getStmtClass() <= lastBinaryOperatorConstant; 2905 } 2906 static bool classof(const BinaryOperator *) { return true; } 2907 2908 // Iterators 2909 child_range children() { 2910 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2911 } 2912 2913protected: 2914 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2915 ExprValueKind VK, ExprObjectKind OK, 2916 SourceLocation opLoc, bool dead) 2917 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2918 lhs->isTypeDependent() || rhs->isTypeDependent(), 2919 lhs->isValueDependent() || rhs->isValueDependent(), 2920 (lhs->isInstantiationDependent() || 2921 rhs->isInstantiationDependent()), 2922 (lhs->containsUnexpandedParameterPack() || 2923 rhs->containsUnexpandedParameterPack())), 2924 Opc(opc), OpLoc(opLoc) { 2925 SubExprs[LHS] = lhs; 2926 SubExprs[RHS] = rhs; 2927 } 2928 2929 BinaryOperator(StmtClass SC, EmptyShell Empty) 2930 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2931}; 2932 2933/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2934/// track of the type the operation is performed in. Due to the semantics of 2935/// these operators, the operands are promoted, the arithmetic performed, an 2936/// implicit conversion back to the result type done, then the assignment takes 2937/// place. This captures the intermediate type which the computation is done 2938/// in. 2939class CompoundAssignOperator : public BinaryOperator { 2940 QualType ComputationLHSType; 2941 QualType ComputationResultType; 2942public: 2943 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2944 ExprValueKind VK, ExprObjectKind OK, 2945 QualType CompLHSType, QualType CompResultType, 2946 SourceLocation OpLoc) 2947 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2948 ComputationLHSType(CompLHSType), 2949 ComputationResultType(CompResultType) { 2950 assert(isCompoundAssignmentOp() && 2951 "Only should be used for compound assignments"); 2952 } 2953 2954 /// \brief Build an empty compound assignment operator expression. 2955 explicit CompoundAssignOperator(EmptyShell Empty) 2956 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2957 2958 // The two computation types are the type the LHS is converted 2959 // to for the computation and the type of the result; the two are 2960 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2961 QualType getComputationLHSType() const { return ComputationLHSType; } 2962 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2963 2964 QualType getComputationResultType() const { return ComputationResultType; } 2965 void setComputationResultType(QualType T) { ComputationResultType = T; } 2966 2967 static bool classof(const CompoundAssignOperator *) { return true; } 2968 static bool classof(const Stmt *S) { 2969 return S->getStmtClass() == CompoundAssignOperatorClass; 2970 } 2971}; 2972 2973/// AbstractConditionalOperator - An abstract base class for 2974/// ConditionalOperator and BinaryConditionalOperator. 2975class AbstractConditionalOperator : public Expr { 2976 SourceLocation QuestionLoc, ColonLoc; 2977 friend class ASTStmtReader; 2978 2979protected: 2980 AbstractConditionalOperator(StmtClass SC, QualType T, 2981 ExprValueKind VK, ExprObjectKind OK, 2982 bool TD, bool VD, bool ID, 2983 bool ContainsUnexpandedParameterPack, 2984 SourceLocation qloc, 2985 SourceLocation cloc) 2986 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 2987 QuestionLoc(qloc), ColonLoc(cloc) {} 2988 2989 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2990 : Expr(SC, Empty) { } 2991 2992public: 2993 // getCond - Return the expression representing the condition for 2994 // the ?: operator. 2995 Expr *getCond() const; 2996 2997 // getTrueExpr - Return the subexpression representing the value of 2998 // the expression if the condition evaluates to true. 2999 Expr *getTrueExpr() const; 3000 3001 // getFalseExpr - Return the subexpression representing the value of 3002 // the expression if the condition evaluates to false. This is 3003 // the same as getRHS. 3004 Expr *getFalseExpr() const; 3005 3006 SourceLocation getQuestionLoc() const { return QuestionLoc; } 3007 SourceLocation getColonLoc() const { return ColonLoc; } 3008 3009 static bool classof(const Stmt *T) { 3010 return T->getStmtClass() == ConditionalOperatorClass || 3011 T->getStmtClass() == BinaryConditionalOperatorClass; 3012 } 3013 static bool classof(const AbstractConditionalOperator *) { return true; } 3014}; 3015 3016/// ConditionalOperator - The ?: ternary operator. The GNU "missing 3017/// middle" extension is a BinaryConditionalOperator. 3018class ConditionalOperator : public AbstractConditionalOperator { 3019 enum { COND, LHS, RHS, END_EXPR }; 3020 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3021 3022 friend class ASTStmtReader; 3023public: 3024 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 3025 SourceLocation CLoc, Expr *rhs, 3026 QualType t, ExprValueKind VK, ExprObjectKind OK) 3027 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 3028 // FIXME: the type of the conditional operator doesn't 3029 // depend on the type of the conditional, but the standard 3030 // seems to imply that it could. File a bug! 3031 (lhs->isTypeDependent() || rhs->isTypeDependent()), 3032 (cond->isValueDependent() || lhs->isValueDependent() || 3033 rhs->isValueDependent()), 3034 (cond->isInstantiationDependent() || 3035 lhs->isInstantiationDependent() || 3036 rhs->isInstantiationDependent()), 3037 (cond->containsUnexpandedParameterPack() || 3038 lhs->containsUnexpandedParameterPack() || 3039 rhs->containsUnexpandedParameterPack()), 3040 QLoc, CLoc) { 3041 SubExprs[COND] = cond; 3042 SubExprs[LHS] = lhs; 3043 SubExprs[RHS] = rhs; 3044 } 3045 3046 /// \brief Build an empty conditional operator. 3047 explicit ConditionalOperator(EmptyShell Empty) 3048 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 3049 3050 // getCond - Return the expression representing the condition for 3051 // the ?: operator. 3052 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3053 3054 // getTrueExpr - Return the subexpression representing the value of 3055 // the expression if the condition evaluates to true. 3056 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3057 3058 // getFalseExpr - Return the subexpression representing the value of 3059 // the expression if the condition evaluates to false. This is 3060 // the same as getRHS. 3061 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3062 3063 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3064 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3065 3066 SourceRange getSourceRange() const LLVM_READONLY { 3067 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 3068 } 3069 static bool classof(const Stmt *T) { 3070 return T->getStmtClass() == ConditionalOperatorClass; 3071 } 3072 static bool classof(const ConditionalOperator *) { return true; } 3073 3074 // Iterators 3075 child_range children() { 3076 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3077 } 3078}; 3079 3080/// BinaryConditionalOperator - The GNU extension to the conditional 3081/// operator which allows the middle operand to be omitted. 3082/// 3083/// This is a different expression kind on the assumption that almost 3084/// every client ends up needing to know that these are different. 3085class BinaryConditionalOperator : public AbstractConditionalOperator { 3086 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3087 3088 /// - the common condition/left-hand-side expression, which will be 3089 /// evaluated as the opaque value 3090 /// - the condition, expressed in terms of the opaque value 3091 /// - the left-hand-side, expressed in terms of the opaque value 3092 /// - the right-hand-side 3093 Stmt *SubExprs[NUM_SUBEXPRS]; 3094 OpaqueValueExpr *OpaqueValue; 3095 3096 friend class ASTStmtReader; 3097public: 3098 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3099 Expr *cond, Expr *lhs, Expr *rhs, 3100 SourceLocation qloc, SourceLocation cloc, 3101 QualType t, ExprValueKind VK, ExprObjectKind OK) 3102 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3103 (common->isTypeDependent() || rhs->isTypeDependent()), 3104 (common->isValueDependent() || rhs->isValueDependent()), 3105 (common->isInstantiationDependent() || 3106 rhs->isInstantiationDependent()), 3107 (common->containsUnexpandedParameterPack() || 3108 rhs->containsUnexpandedParameterPack()), 3109 qloc, cloc), 3110 OpaqueValue(opaqueValue) { 3111 SubExprs[COMMON] = common; 3112 SubExprs[COND] = cond; 3113 SubExprs[LHS] = lhs; 3114 SubExprs[RHS] = rhs; 3115 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value"); 3116 } 3117 3118 /// \brief Build an empty conditional operator. 3119 explicit BinaryConditionalOperator(EmptyShell Empty) 3120 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3121 3122 /// \brief getCommon - Return the common expression, written to the 3123 /// left of the condition. The opaque value will be bound to the 3124 /// result of this expression. 3125 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3126 3127 /// \brief getOpaqueValue - Return the opaque value placeholder. 3128 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3129 3130 /// \brief getCond - Return the condition expression; this is defined 3131 /// in terms of the opaque value. 3132 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3133 3134 /// \brief getTrueExpr - Return the subexpression which will be 3135 /// evaluated if the condition evaluates to true; this is defined 3136 /// in terms of the opaque value. 3137 Expr *getTrueExpr() const { 3138 return cast<Expr>(SubExprs[LHS]); 3139 } 3140 3141 /// \brief getFalseExpr - Return the subexpression which will be 3142 /// evaluated if the condnition evaluates to false; this is 3143 /// defined in terms of the opaque value. 3144 Expr *getFalseExpr() const { 3145 return cast<Expr>(SubExprs[RHS]); 3146 } 3147 3148 SourceRange getSourceRange() const LLVM_READONLY { 3149 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 3150 } 3151 static bool classof(const Stmt *T) { 3152 return T->getStmtClass() == BinaryConditionalOperatorClass; 3153 } 3154 static bool classof(const BinaryConditionalOperator *) { return true; } 3155 3156 // Iterators 3157 child_range children() { 3158 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3159 } 3160}; 3161 3162inline Expr *AbstractConditionalOperator::getCond() const { 3163 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3164 return co->getCond(); 3165 return cast<BinaryConditionalOperator>(this)->getCond(); 3166} 3167 3168inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3169 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3170 return co->getTrueExpr(); 3171 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3172} 3173 3174inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3175 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3176 return co->getFalseExpr(); 3177 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3178} 3179 3180/// AddrLabelExpr - The GNU address of label extension, representing &&label. 3181class AddrLabelExpr : public Expr { 3182 SourceLocation AmpAmpLoc, LabelLoc; 3183 LabelDecl *Label; 3184public: 3185 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3186 QualType t) 3187 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3188 false), 3189 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3190 3191 /// \brief Build an empty address of a label expression. 3192 explicit AddrLabelExpr(EmptyShell Empty) 3193 : Expr(AddrLabelExprClass, Empty) { } 3194 3195 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3196 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3197 SourceLocation getLabelLoc() const { return LabelLoc; } 3198 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3199 3200 SourceRange getSourceRange() const LLVM_READONLY { 3201 return SourceRange(AmpAmpLoc, LabelLoc); 3202 } 3203 3204 LabelDecl *getLabel() const { return Label; } 3205 void setLabel(LabelDecl *L) { Label = L; } 3206 3207 static bool classof(const Stmt *T) { 3208 return T->getStmtClass() == AddrLabelExprClass; 3209 } 3210 static bool classof(const AddrLabelExpr *) { return true; } 3211 3212 // Iterators 3213 child_range children() { return child_range(); } 3214}; 3215 3216/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3217/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3218/// takes the value of the last subexpression. 3219/// 3220/// A StmtExpr is always an r-value; values "returned" out of a 3221/// StmtExpr will be copied. 3222class StmtExpr : public Expr { 3223 Stmt *SubStmt; 3224 SourceLocation LParenLoc, RParenLoc; 3225public: 3226 // FIXME: Does type-dependence need to be computed differently? 3227 // FIXME: Do we need to compute instantiation instantiation-dependence for 3228 // statements? (ugh!) 3229 StmtExpr(CompoundStmt *substmt, QualType T, 3230 SourceLocation lp, SourceLocation rp) : 3231 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3232 T->isDependentType(), false, false, false), 3233 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3234 3235 /// \brief Build an empty statement expression. 3236 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3237 3238 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3239 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3240 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3241 3242 SourceRange getSourceRange() const LLVM_READONLY { 3243 return SourceRange(LParenLoc, RParenLoc); 3244 } 3245 3246 SourceLocation getLParenLoc() const { return LParenLoc; } 3247 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3248 SourceLocation getRParenLoc() const { return RParenLoc; } 3249 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3250 3251 static bool classof(const Stmt *T) { 3252 return T->getStmtClass() == StmtExprClass; 3253 } 3254 static bool classof(const StmtExpr *) { return true; } 3255 3256 // Iterators 3257 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3258}; 3259 3260 3261/// ShuffleVectorExpr - clang-specific builtin-in function 3262/// __builtin_shufflevector. 3263/// This AST node represents a operator that does a constant 3264/// shuffle, similar to LLVM's shufflevector instruction. It takes 3265/// two vectors and a variable number of constant indices, 3266/// and returns the appropriately shuffled vector. 3267class ShuffleVectorExpr : public Expr { 3268 SourceLocation BuiltinLoc, RParenLoc; 3269 3270 // SubExprs - the list of values passed to the __builtin_shufflevector 3271 // function. The first two are vectors, and the rest are constant 3272 // indices. The number of values in this list is always 3273 // 2+the number of indices in the vector type. 3274 Stmt **SubExprs; 3275 unsigned NumExprs; 3276 3277public: 3278 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3279 QualType Type, SourceLocation BLoc, 3280 SourceLocation RP); 3281 3282 /// \brief Build an empty vector-shuffle expression. 3283 explicit ShuffleVectorExpr(EmptyShell Empty) 3284 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3285 3286 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3287 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3288 3289 SourceLocation getRParenLoc() const { return RParenLoc; } 3290 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3291 3292 SourceRange getSourceRange() const LLVM_READONLY { 3293 return SourceRange(BuiltinLoc, RParenLoc); 3294 } 3295 static bool classof(const Stmt *T) { 3296 return T->getStmtClass() == ShuffleVectorExprClass; 3297 } 3298 static bool classof(const ShuffleVectorExpr *) { return true; } 3299 3300 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3301 /// constant expression, the actual arguments passed in, and the function 3302 /// pointers. 3303 unsigned getNumSubExprs() const { return NumExprs; } 3304 3305 /// \brief Retrieve the array of expressions. 3306 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3307 3308 /// getExpr - Return the Expr at the specified index. 3309 Expr *getExpr(unsigned Index) { 3310 assert((Index < NumExprs) && "Arg access out of range!"); 3311 return cast<Expr>(SubExprs[Index]); 3312 } 3313 const Expr *getExpr(unsigned Index) const { 3314 assert((Index < NumExprs) && "Arg access out of range!"); 3315 return cast<Expr>(SubExprs[Index]); 3316 } 3317 3318 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3319 3320 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3321 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3322 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3323 } 3324 3325 // Iterators 3326 child_range children() { 3327 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3328 } 3329}; 3330 3331/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3332/// This AST node is similar to the conditional operator (?:) in C, with 3333/// the following exceptions: 3334/// - the test expression must be a integer constant expression. 3335/// - the expression returned acts like the chosen subexpression in every 3336/// visible way: the type is the same as that of the chosen subexpression, 3337/// and all predicates (whether it's an l-value, whether it's an integer 3338/// constant expression, etc.) return the same result as for the chosen 3339/// sub-expression. 3340class ChooseExpr : public Expr { 3341 enum { COND, LHS, RHS, END_EXPR }; 3342 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3343 SourceLocation BuiltinLoc, RParenLoc; 3344public: 3345 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3346 QualType t, ExprValueKind VK, ExprObjectKind OK, 3347 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3348 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3349 (cond->isInstantiationDependent() || 3350 lhs->isInstantiationDependent() || 3351 rhs->isInstantiationDependent()), 3352 (cond->containsUnexpandedParameterPack() || 3353 lhs->containsUnexpandedParameterPack() || 3354 rhs->containsUnexpandedParameterPack())), 3355 BuiltinLoc(BLoc), RParenLoc(RP) { 3356 SubExprs[COND] = cond; 3357 SubExprs[LHS] = lhs; 3358 SubExprs[RHS] = rhs; 3359 } 3360 3361 /// \brief Build an empty __builtin_choose_expr. 3362 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3363 3364 /// isConditionTrue - Return whether the condition is true (i.e. not 3365 /// equal to zero). 3366 bool isConditionTrue(const ASTContext &C) const; 3367 3368 /// getChosenSubExpr - Return the subexpression chosen according to the 3369 /// condition. 3370 Expr *getChosenSubExpr(const ASTContext &C) const { 3371 return isConditionTrue(C) ? getLHS() : getRHS(); 3372 } 3373 3374 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3375 void setCond(Expr *E) { SubExprs[COND] = E; } 3376 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3377 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3378 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3379 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3380 3381 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3382 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3383 3384 SourceLocation getRParenLoc() const { return RParenLoc; } 3385 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3386 3387 SourceRange getSourceRange() const LLVM_READONLY { 3388 return SourceRange(BuiltinLoc, RParenLoc); 3389 } 3390 static bool classof(const Stmt *T) { 3391 return T->getStmtClass() == ChooseExprClass; 3392 } 3393 static bool classof(const ChooseExpr *) { return true; } 3394 3395 // Iterators 3396 child_range children() { 3397 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3398 } 3399}; 3400 3401/// GNUNullExpr - Implements the GNU __null extension, which is a name 3402/// for a null pointer constant that has integral type (e.g., int or 3403/// long) and is the same size and alignment as a pointer. The __null 3404/// extension is typically only used by system headers, which define 3405/// NULL as __null in C++ rather than using 0 (which is an integer 3406/// that may not match the size of a pointer). 3407class GNUNullExpr : public Expr { 3408 /// TokenLoc - The location of the __null keyword. 3409 SourceLocation TokenLoc; 3410 3411public: 3412 GNUNullExpr(QualType Ty, SourceLocation Loc) 3413 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3414 false), 3415 TokenLoc(Loc) { } 3416 3417 /// \brief Build an empty GNU __null expression. 3418 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3419 3420 /// getTokenLocation - The location of the __null token. 3421 SourceLocation getTokenLocation() const { return TokenLoc; } 3422 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3423 3424 SourceRange getSourceRange() const LLVM_READONLY { 3425 return SourceRange(TokenLoc); 3426 } 3427 static bool classof(const Stmt *T) { 3428 return T->getStmtClass() == GNUNullExprClass; 3429 } 3430 static bool classof(const GNUNullExpr *) { return true; } 3431 3432 // Iterators 3433 child_range children() { return child_range(); } 3434}; 3435 3436/// VAArgExpr, used for the builtin function __builtin_va_arg. 3437class VAArgExpr : public Expr { 3438 Stmt *Val; 3439 TypeSourceInfo *TInfo; 3440 SourceLocation BuiltinLoc, RParenLoc; 3441public: 3442 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3443 SourceLocation RPLoc, QualType t) 3444 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3445 t->isDependentType(), false, 3446 (TInfo->getType()->isInstantiationDependentType() || 3447 e->isInstantiationDependent()), 3448 (TInfo->getType()->containsUnexpandedParameterPack() || 3449 e->containsUnexpandedParameterPack())), 3450 Val(e), TInfo(TInfo), 3451 BuiltinLoc(BLoc), 3452 RParenLoc(RPLoc) { } 3453 3454 /// \brief Create an empty __builtin_va_arg expression. 3455 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3456 3457 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3458 Expr *getSubExpr() { return cast<Expr>(Val); } 3459 void setSubExpr(Expr *E) { Val = E; } 3460 3461 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3462 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3463 3464 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3465 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3466 3467 SourceLocation getRParenLoc() const { return RParenLoc; } 3468 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3469 3470 SourceRange getSourceRange() const LLVM_READONLY { 3471 return SourceRange(BuiltinLoc, RParenLoc); 3472 } 3473 static bool classof(const Stmt *T) { 3474 return T->getStmtClass() == VAArgExprClass; 3475 } 3476 static bool classof(const VAArgExpr *) { return true; } 3477 3478 // Iterators 3479 child_range children() { return child_range(&Val, &Val+1); } 3480}; 3481 3482/// @brief Describes an C or C++ initializer list. 3483/// 3484/// InitListExpr describes an initializer list, which can be used to 3485/// initialize objects of different types, including 3486/// struct/class/union types, arrays, and vectors. For example: 3487/// 3488/// @code 3489/// struct foo x = { 1, { 2, 3 } }; 3490/// @endcode 3491/// 3492/// Prior to semantic analysis, an initializer list will represent the 3493/// initializer list as written by the user, but will have the 3494/// placeholder type "void". This initializer list is called the 3495/// syntactic form of the initializer, and may contain C99 designated 3496/// initializers (represented as DesignatedInitExprs), initializations 3497/// of subobject members without explicit braces, and so on. Clients 3498/// interested in the original syntax of the initializer list should 3499/// use the syntactic form of the initializer list. 3500/// 3501/// After semantic analysis, the initializer list will represent the 3502/// semantic form of the initializer, where the initializations of all 3503/// subobjects are made explicit with nested InitListExpr nodes and 3504/// C99 designators have been eliminated by placing the designated 3505/// initializations into the subobject they initialize. Additionally, 3506/// any "holes" in the initialization, where no initializer has been 3507/// specified for a particular subobject, will be replaced with 3508/// implicitly-generated ImplicitValueInitExpr expressions that 3509/// value-initialize the subobjects. Note, however, that the 3510/// initializer lists may still have fewer initializers than there are 3511/// elements to initialize within the object. 3512/// 3513/// Given the semantic form of the initializer list, one can retrieve 3514/// the original syntactic form of that initializer list (if it 3515/// exists) using getSyntacticForm(). Since many initializer lists 3516/// have the same syntactic and semantic forms, getSyntacticForm() may 3517/// return NULL, indicating that the current initializer list also 3518/// serves as its syntactic form. 3519class InitListExpr : public Expr { 3520 // FIXME: Eliminate this vector in favor of ASTContext allocation 3521 typedef ASTVector<Stmt *> InitExprsTy; 3522 InitExprsTy InitExprs; 3523 SourceLocation LBraceLoc, RBraceLoc; 3524 3525 /// Contains the initializer list that describes the syntactic form 3526 /// written in the source code. 3527 InitListExpr *SyntacticForm; 3528 3529 /// \brief Either: 3530 /// If this initializer list initializes an array with more elements than 3531 /// there are initializers in the list, specifies an expression to be used 3532 /// for value initialization of the rest of the elements. 3533 /// Or 3534 /// If this initializer list initializes a union, specifies which 3535 /// field within the union will be initialized. 3536 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3537 3538public: 3539 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3540 Expr **initexprs, unsigned numinits, 3541 SourceLocation rbraceloc); 3542 3543 /// \brief Build an empty initializer list. 3544 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3545 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3546 3547 unsigned getNumInits() const { return InitExprs.size(); } 3548 3549 /// \brief Retrieve the set of initializers. 3550 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3551 3552 const Expr *getInit(unsigned Init) const { 3553 assert(Init < getNumInits() && "Initializer access out of range!"); 3554 return cast_or_null<Expr>(InitExprs[Init]); 3555 } 3556 3557 Expr *getInit(unsigned Init) { 3558 assert(Init < getNumInits() && "Initializer access out of range!"); 3559 return cast_or_null<Expr>(InitExprs[Init]); 3560 } 3561 3562 void setInit(unsigned Init, Expr *expr) { 3563 assert(Init < getNumInits() && "Initializer access out of range!"); 3564 InitExprs[Init] = expr; 3565 } 3566 3567 /// \brief Reserve space for some number of initializers. 3568 void reserveInits(ASTContext &C, unsigned NumInits); 3569 3570 /// @brief Specify the number of initializers 3571 /// 3572 /// If there are more than @p NumInits initializers, the remaining 3573 /// initializers will be destroyed. If there are fewer than @p 3574 /// NumInits initializers, NULL expressions will be added for the 3575 /// unknown initializers. 3576 void resizeInits(ASTContext &Context, unsigned NumInits); 3577 3578 /// @brief Updates the initializer at index @p Init with the new 3579 /// expression @p expr, and returns the old expression at that 3580 /// location. 3581 /// 3582 /// When @p Init is out of range for this initializer list, the 3583 /// initializer list will be extended with NULL expressions to 3584 /// accommodate the new entry. 3585 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3586 3587 /// \brief If this initializer list initializes an array with more elements 3588 /// than there are initializers in the list, specifies an expression to be 3589 /// used for value initialization of the rest of the elements. 3590 Expr *getArrayFiller() { 3591 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3592 } 3593 const Expr *getArrayFiller() const { 3594 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3595 } 3596 void setArrayFiller(Expr *filler); 3597 3598 /// \brief Return true if this is an array initializer and its array "filler" 3599 /// has been set. 3600 bool hasArrayFiller() const { return getArrayFiller(); } 3601 3602 /// \brief If this initializes a union, specifies which field in the 3603 /// union to initialize. 3604 /// 3605 /// Typically, this field is the first named field within the 3606 /// union. However, a designated initializer can specify the 3607 /// initialization of a different field within the union. 3608 FieldDecl *getInitializedFieldInUnion() { 3609 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3610 } 3611 const FieldDecl *getInitializedFieldInUnion() const { 3612 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3613 } 3614 void setInitializedFieldInUnion(FieldDecl *FD) { 3615 ArrayFillerOrUnionFieldInit = FD; 3616 } 3617 3618 // Explicit InitListExpr's originate from source code (and have valid source 3619 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3620 bool isExplicit() { 3621 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3622 } 3623 3624 // Is this an initializer for an array of characters, initialized by a string 3625 // literal or an @encode? 3626 bool isStringLiteralInit() const; 3627 3628 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3629 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3630 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3631 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3632 3633 /// @brief Retrieve the initializer list that describes the 3634 /// syntactic form of the initializer. 3635 /// 3636 /// 3637 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3638 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3639 3640 bool hadArrayRangeDesignator() const { 3641 return InitListExprBits.HadArrayRangeDesignator != 0; 3642 } 3643 void sawArrayRangeDesignator(bool ARD = true) { 3644 InitListExprBits.HadArrayRangeDesignator = ARD; 3645 } 3646 3647 bool initializesStdInitializerList() const { 3648 return InitListExprBits.InitializesStdInitializerList != 0; 3649 } 3650 void setInitializesStdInitializerList(bool ISIL = true) { 3651 InitListExprBits.InitializesStdInitializerList = ISIL; 3652 } 3653 3654 SourceRange getSourceRange() const LLVM_READONLY; 3655 3656 static bool classof(const Stmt *T) { 3657 return T->getStmtClass() == InitListExprClass; 3658 } 3659 static bool classof(const InitListExpr *) { return true; } 3660 3661 // Iterators 3662 child_range children() { 3663 if (InitExprs.empty()) return child_range(); 3664 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3665 } 3666 3667 typedef InitExprsTy::iterator iterator; 3668 typedef InitExprsTy::const_iterator const_iterator; 3669 typedef InitExprsTy::reverse_iterator reverse_iterator; 3670 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3671 3672 iterator begin() { return InitExprs.begin(); } 3673 const_iterator begin() const { return InitExprs.begin(); } 3674 iterator end() { return InitExprs.end(); } 3675 const_iterator end() const { return InitExprs.end(); } 3676 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3677 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3678 reverse_iterator rend() { return InitExprs.rend(); } 3679 const_reverse_iterator rend() const { return InitExprs.rend(); } 3680 3681 friend class ASTStmtReader; 3682 friend class ASTStmtWriter; 3683}; 3684 3685/// @brief Represents a C99 designated initializer expression. 3686/// 3687/// A designated initializer expression (C99 6.7.8) contains one or 3688/// more designators (which can be field designators, array 3689/// designators, or GNU array-range designators) followed by an 3690/// expression that initializes the field or element(s) that the 3691/// designators refer to. For example, given: 3692/// 3693/// @code 3694/// struct point { 3695/// double x; 3696/// double y; 3697/// }; 3698/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3699/// @endcode 3700/// 3701/// The InitListExpr contains three DesignatedInitExprs, the first of 3702/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3703/// designators, one array designator for @c [2] followed by one field 3704/// designator for @c .y. The initalization expression will be 1.0. 3705class DesignatedInitExpr : public Expr { 3706public: 3707 /// \brief Forward declaration of the Designator class. 3708 class Designator; 3709 3710private: 3711 /// The location of the '=' or ':' prior to the actual initializer 3712 /// expression. 3713 SourceLocation EqualOrColonLoc; 3714 3715 /// Whether this designated initializer used the GNU deprecated 3716 /// syntax rather than the C99 '=' syntax. 3717 bool GNUSyntax : 1; 3718 3719 /// The number of designators in this initializer expression. 3720 unsigned NumDesignators : 15; 3721 3722 /// The number of subexpressions of this initializer expression, 3723 /// which contains both the initializer and any additional 3724 /// expressions used by array and array-range designators. 3725 unsigned NumSubExprs : 16; 3726 3727 /// \brief The designators in this designated initialization 3728 /// expression. 3729 Designator *Designators; 3730 3731 3732 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3733 const Designator *Designators, 3734 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3735 Expr **IndexExprs, unsigned NumIndexExprs, 3736 Expr *Init); 3737 3738 explicit DesignatedInitExpr(unsigned NumSubExprs) 3739 : Expr(DesignatedInitExprClass, EmptyShell()), 3740 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(0) { } 3741 3742public: 3743 /// A field designator, e.g., ".x". 3744 struct FieldDesignator { 3745 /// Refers to the field that is being initialized. The low bit 3746 /// of this field determines whether this is actually a pointer 3747 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3748 /// initially constructed, a field designator will store an 3749 /// IdentifierInfo*. After semantic analysis has resolved that 3750 /// name, the field designator will instead store a FieldDecl*. 3751 uintptr_t NameOrField; 3752 3753 /// The location of the '.' in the designated initializer. 3754 unsigned DotLoc; 3755 3756 /// The location of the field name in the designated initializer. 3757 unsigned FieldLoc; 3758 }; 3759 3760 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3761 struct ArrayOrRangeDesignator { 3762 /// Location of the first index expression within the designated 3763 /// initializer expression's list of subexpressions. 3764 unsigned Index; 3765 /// The location of the '[' starting the array range designator. 3766 unsigned LBracketLoc; 3767 /// The location of the ellipsis separating the start and end 3768 /// indices. Only valid for GNU array-range designators. 3769 unsigned EllipsisLoc; 3770 /// The location of the ']' terminating the array range designator. 3771 unsigned RBracketLoc; 3772 }; 3773 3774 /// @brief Represents a single C99 designator. 3775 /// 3776 /// @todo This class is infuriatingly similar to clang::Designator, 3777 /// but minor differences (storing indices vs. storing pointers) 3778 /// keep us from reusing it. Try harder, later, to rectify these 3779 /// differences. 3780 class Designator { 3781 /// @brief The kind of designator this describes. 3782 enum { 3783 FieldDesignator, 3784 ArrayDesignator, 3785 ArrayRangeDesignator 3786 } Kind; 3787 3788 union { 3789 /// A field designator, e.g., ".x". 3790 struct FieldDesignator Field; 3791 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3792 struct ArrayOrRangeDesignator ArrayOrRange; 3793 }; 3794 friend class DesignatedInitExpr; 3795 3796 public: 3797 Designator() {} 3798 3799 /// @brief Initializes a field designator. 3800 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3801 SourceLocation FieldLoc) 3802 : Kind(FieldDesignator) { 3803 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3804 Field.DotLoc = DotLoc.getRawEncoding(); 3805 Field.FieldLoc = FieldLoc.getRawEncoding(); 3806 } 3807 3808 /// @brief Initializes an array designator. 3809 Designator(unsigned Index, SourceLocation LBracketLoc, 3810 SourceLocation RBracketLoc) 3811 : Kind(ArrayDesignator) { 3812 ArrayOrRange.Index = Index; 3813 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3814 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3815 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3816 } 3817 3818 /// @brief Initializes a GNU array-range designator. 3819 Designator(unsigned Index, SourceLocation LBracketLoc, 3820 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3821 : Kind(ArrayRangeDesignator) { 3822 ArrayOrRange.Index = Index; 3823 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3824 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3825 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3826 } 3827 3828 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3829 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3830 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3831 3832 IdentifierInfo *getFieldName() const; 3833 3834 FieldDecl *getField() const { 3835 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3836 if (Field.NameOrField & 0x01) 3837 return 0; 3838 else 3839 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3840 } 3841 3842 void setField(FieldDecl *FD) { 3843 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3844 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3845 } 3846 3847 SourceLocation getDotLoc() const { 3848 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3849 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3850 } 3851 3852 SourceLocation getFieldLoc() const { 3853 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3854 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3855 } 3856 3857 SourceLocation getLBracketLoc() const { 3858 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3859 "Only valid on an array or array-range designator"); 3860 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3861 } 3862 3863 SourceLocation getRBracketLoc() const { 3864 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3865 "Only valid on an array or array-range designator"); 3866 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3867 } 3868 3869 SourceLocation getEllipsisLoc() const { 3870 assert(Kind == ArrayRangeDesignator && 3871 "Only valid on an array-range designator"); 3872 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3873 } 3874 3875 unsigned getFirstExprIndex() const { 3876 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3877 "Only valid on an array or array-range designator"); 3878 return ArrayOrRange.Index; 3879 } 3880 3881 SourceLocation getStartLocation() const { 3882 if (Kind == FieldDesignator) 3883 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3884 else 3885 return getLBracketLoc(); 3886 } 3887 SourceLocation getEndLocation() const { 3888 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3889 } 3890 SourceRange getSourceRange() const LLVM_READONLY { 3891 return SourceRange(getStartLocation(), getEndLocation()); 3892 } 3893 }; 3894 3895 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3896 unsigned NumDesignators, 3897 Expr **IndexExprs, unsigned NumIndexExprs, 3898 SourceLocation EqualOrColonLoc, 3899 bool GNUSyntax, Expr *Init); 3900 3901 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3902 3903 /// @brief Returns the number of designators in this initializer. 3904 unsigned size() const { return NumDesignators; } 3905 3906 // Iterator access to the designators. 3907 typedef Designator *designators_iterator; 3908 designators_iterator designators_begin() { return Designators; } 3909 designators_iterator designators_end() { 3910 return Designators + NumDesignators; 3911 } 3912 3913 typedef const Designator *const_designators_iterator; 3914 const_designators_iterator designators_begin() const { return Designators; } 3915 const_designators_iterator designators_end() const { 3916 return Designators + NumDesignators; 3917 } 3918 3919 typedef std::reverse_iterator<designators_iterator> 3920 reverse_designators_iterator; 3921 reverse_designators_iterator designators_rbegin() { 3922 return reverse_designators_iterator(designators_end()); 3923 } 3924 reverse_designators_iterator designators_rend() { 3925 return reverse_designators_iterator(designators_begin()); 3926 } 3927 3928 typedef std::reverse_iterator<const_designators_iterator> 3929 const_reverse_designators_iterator; 3930 const_reverse_designators_iterator designators_rbegin() const { 3931 return const_reverse_designators_iterator(designators_end()); 3932 } 3933 const_reverse_designators_iterator designators_rend() const { 3934 return const_reverse_designators_iterator(designators_begin()); 3935 } 3936 3937 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3938 3939 void setDesignators(ASTContext &C, const Designator *Desigs, 3940 unsigned NumDesigs); 3941 3942 Expr *getArrayIndex(const Designator& D); 3943 Expr *getArrayRangeStart(const Designator& D); 3944 Expr *getArrayRangeEnd(const Designator& D); 3945 3946 /// @brief Retrieve the location of the '=' that precedes the 3947 /// initializer value itself, if present. 3948 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3949 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3950 3951 /// @brief Determines whether this designated initializer used the 3952 /// deprecated GNU syntax for designated initializers. 3953 bool usesGNUSyntax() const { return GNUSyntax; } 3954 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3955 3956 /// @brief Retrieve the initializer value. 3957 Expr *getInit() const { 3958 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3959 } 3960 3961 void setInit(Expr *init) { 3962 *child_begin() = init; 3963 } 3964 3965 /// \brief Retrieve the total number of subexpressions in this 3966 /// designated initializer expression, including the actual 3967 /// initialized value and any expressions that occur within array 3968 /// and array-range designators. 3969 unsigned getNumSubExprs() const { return NumSubExprs; } 3970 3971 Expr *getSubExpr(unsigned Idx) { 3972 assert(Idx < NumSubExprs && "Subscript out of range"); 3973 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3974 Ptr += sizeof(DesignatedInitExpr); 3975 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3976 } 3977 3978 void setSubExpr(unsigned Idx, Expr *E) { 3979 assert(Idx < NumSubExprs && "Subscript out of range"); 3980 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3981 Ptr += sizeof(DesignatedInitExpr); 3982 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3983 } 3984 3985 /// \brief Replaces the designator at index @p Idx with the series 3986 /// of designators in [First, Last). 3987 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3988 const Designator *Last); 3989 3990 SourceRange getDesignatorsSourceRange() const; 3991 3992 SourceRange getSourceRange() const LLVM_READONLY; 3993 3994 static bool classof(const Stmt *T) { 3995 return T->getStmtClass() == DesignatedInitExprClass; 3996 } 3997 static bool classof(const DesignatedInitExpr *) { return true; } 3998 3999 // Iterators 4000 child_range children() { 4001 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 4002 return child_range(begin, begin + NumSubExprs); 4003 } 4004}; 4005 4006/// \brief Represents an implicitly-generated value initialization of 4007/// an object of a given type. 4008/// 4009/// Implicit value initializations occur within semantic initializer 4010/// list expressions (InitListExpr) as placeholders for subobject 4011/// initializations not explicitly specified by the user. 4012/// 4013/// \see InitListExpr 4014class ImplicitValueInitExpr : public Expr { 4015public: 4016 explicit ImplicitValueInitExpr(QualType ty) 4017 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 4018 false, false, ty->isInstantiationDependentType(), false) { } 4019 4020 /// \brief Construct an empty implicit value initialization. 4021 explicit ImplicitValueInitExpr(EmptyShell Empty) 4022 : Expr(ImplicitValueInitExprClass, Empty) { } 4023 4024 static bool classof(const Stmt *T) { 4025 return T->getStmtClass() == ImplicitValueInitExprClass; 4026 } 4027 static bool classof(const ImplicitValueInitExpr *) { return true; } 4028 4029 SourceRange getSourceRange() const LLVM_READONLY { 4030 return SourceRange(); 4031 } 4032 4033 // Iterators 4034 child_range children() { return child_range(); } 4035}; 4036 4037 4038class ParenListExpr : public Expr { 4039 Stmt **Exprs; 4040 unsigned NumExprs; 4041 SourceLocation LParenLoc, RParenLoc; 4042 4043public: 4044 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 4045 unsigned numexprs, SourceLocation rparenloc); 4046 4047 /// \brief Build an empty paren list. 4048 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 4049 4050 unsigned getNumExprs() const { return NumExprs; } 4051 4052 const Expr* getExpr(unsigned Init) const { 4053 assert(Init < getNumExprs() && "Initializer access out of range!"); 4054 return cast_or_null<Expr>(Exprs[Init]); 4055 } 4056 4057 Expr* getExpr(unsigned Init) { 4058 assert(Init < getNumExprs() && "Initializer access out of range!"); 4059 return cast_or_null<Expr>(Exprs[Init]); 4060 } 4061 4062 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 4063 4064 SourceLocation getLParenLoc() const { return LParenLoc; } 4065 SourceLocation getRParenLoc() const { return RParenLoc; } 4066 4067 SourceRange getSourceRange() const LLVM_READONLY { 4068 return SourceRange(LParenLoc, RParenLoc); 4069 } 4070 static bool classof(const Stmt *T) { 4071 return T->getStmtClass() == ParenListExprClass; 4072 } 4073 static bool classof(const ParenListExpr *) { return true; } 4074 4075 // Iterators 4076 child_range children() { 4077 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4078 } 4079 4080 friend class ASTStmtReader; 4081 friend class ASTStmtWriter; 4082}; 4083 4084 4085/// \brief Represents a C11 generic selection. 4086/// 4087/// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4088/// expression, followed by one or more generic associations. Each generic 4089/// association specifies a type name and an expression, or "default" and an 4090/// expression (in which case it is known as a default generic association). 4091/// The type and value of the generic selection are identical to those of its 4092/// result expression, which is defined as the expression in the generic 4093/// association with a type name that is compatible with the type of the 4094/// controlling expression, or the expression in the default generic association 4095/// if no types are compatible. For example: 4096/// 4097/// @code 4098/// _Generic(X, double: 1, float: 2, default: 3) 4099/// @endcode 4100/// 4101/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4102/// or 3 if "hello". 4103/// 4104/// As an extension, generic selections are allowed in C++, where the following 4105/// additional semantics apply: 4106/// 4107/// Any generic selection whose controlling expression is type-dependent or 4108/// which names a dependent type in its association list is result-dependent, 4109/// which means that the choice of result expression is dependent. 4110/// Result-dependent generic associations are both type- and value-dependent. 4111class GenericSelectionExpr : public Expr { 4112 enum { CONTROLLING, END_EXPR }; 4113 TypeSourceInfo **AssocTypes; 4114 Stmt **SubExprs; 4115 unsigned NumAssocs, ResultIndex; 4116 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4117 4118public: 4119 GenericSelectionExpr(ASTContext &Context, 4120 SourceLocation GenericLoc, Expr *ControllingExpr, 4121 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4122 unsigned NumAssocs, SourceLocation DefaultLoc, 4123 SourceLocation RParenLoc, 4124 bool ContainsUnexpandedParameterPack, 4125 unsigned ResultIndex); 4126 4127 /// This constructor is used in the result-dependent case. 4128 GenericSelectionExpr(ASTContext &Context, 4129 SourceLocation GenericLoc, Expr *ControllingExpr, 4130 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4131 unsigned NumAssocs, SourceLocation DefaultLoc, 4132 SourceLocation RParenLoc, 4133 bool ContainsUnexpandedParameterPack); 4134 4135 explicit GenericSelectionExpr(EmptyShell Empty) 4136 : Expr(GenericSelectionExprClass, Empty) { } 4137 4138 unsigned getNumAssocs() const { return NumAssocs; } 4139 4140 SourceLocation getGenericLoc() const { return GenericLoc; } 4141 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4142 SourceLocation getRParenLoc() const { return RParenLoc; } 4143 4144 const Expr *getAssocExpr(unsigned i) const { 4145 return cast<Expr>(SubExprs[END_EXPR+i]); 4146 } 4147 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4148 4149 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4150 return AssocTypes[i]; 4151 } 4152 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4153 4154 QualType getAssocType(unsigned i) const { 4155 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4156 return TS->getType(); 4157 else 4158 return QualType(); 4159 } 4160 4161 const Expr *getControllingExpr() const { 4162 return cast<Expr>(SubExprs[CONTROLLING]); 4163 } 4164 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4165 4166 /// Whether this generic selection is result-dependent. 4167 bool isResultDependent() const { return ResultIndex == -1U; } 4168 4169 /// The zero-based index of the result expression's generic association in 4170 /// the generic selection's association list. Defined only if the 4171 /// generic selection is not result-dependent. 4172 unsigned getResultIndex() const { 4173 assert(!isResultDependent() && "Generic selection is result-dependent"); 4174 return ResultIndex; 4175 } 4176 4177 /// The generic selection's result expression. Defined only if the 4178 /// generic selection is not result-dependent. 4179 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4180 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4181 4182 SourceRange getSourceRange() const LLVM_READONLY { 4183 return SourceRange(GenericLoc, RParenLoc); 4184 } 4185 static bool classof(const Stmt *T) { 4186 return T->getStmtClass() == GenericSelectionExprClass; 4187 } 4188 static bool classof(const GenericSelectionExpr *) { return true; } 4189 4190 child_range children() { 4191 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4192 } 4193 4194 friend class ASTStmtReader; 4195}; 4196 4197//===----------------------------------------------------------------------===// 4198// Clang Extensions 4199//===----------------------------------------------------------------------===// 4200 4201 4202/// ExtVectorElementExpr - This represents access to specific elements of a 4203/// vector, and may occur on the left hand side or right hand side. For example 4204/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4205/// 4206/// Note that the base may have either vector or pointer to vector type, just 4207/// like a struct field reference. 4208/// 4209class ExtVectorElementExpr : public Expr { 4210 Stmt *Base; 4211 IdentifierInfo *Accessor; 4212 SourceLocation AccessorLoc; 4213public: 4214 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4215 IdentifierInfo &accessor, SourceLocation loc) 4216 : Expr(ExtVectorElementExprClass, ty, VK, 4217 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4218 base->isTypeDependent(), base->isValueDependent(), 4219 base->isInstantiationDependent(), 4220 base->containsUnexpandedParameterPack()), 4221 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4222 4223 /// \brief Build an empty vector element expression. 4224 explicit ExtVectorElementExpr(EmptyShell Empty) 4225 : Expr(ExtVectorElementExprClass, Empty) { } 4226 4227 const Expr *getBase() const { return cast<Expr>(Base); } 4228 Expr *getBase() { return cast<Expr>(Base); } 4229 void setBase(Expr *E) { Base = E; } 4230 4231 IdentifierInfo &getAccessor() const { return *Accessor; } 4232 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4233 4234 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4235 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4236 4237 /// getNumElements - Get the number of components being selected. 4238 unsigned getNumElements() const; 4239 4240 /// containsDuplicateElements - Return true if any element access is 4241 /// repeated. 4242 bool containsDuplicateElements() const; 4243 4244 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4245 /// aggregate Constant of ConstantInt(s). 4246 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4247 4248 SourceRange getSourceRange() const LLVM_READONLY { 4249 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4250 } 4251 4252 /// isArrow - Return true if the base expression is a pointer to vector, 4253 /// return false if the base expression is a vector. 4254 bool isArrow() const; 4255 4256 static bool classof(const Stmt *T) { 4257 return T->getStmtClass() == ExtVectorElementExprClass; 4258 } 4259 static bool classof(const ExtVectorElementExpr *) { return true; } 4260 4261 // Iterators 4262 child_range children() { return child_range(&Base, &Base+1); } 4263}; 4264 4265 4266/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4267/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4268class BlockExpr : public Expr { 4269protected: 4270 BlockDecl *TheBlock; 4271public: 4272 BlockExpr(BlockDecl *BD, QualType ty) 4273 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4274 ty->isDependentType(), ty->isDependentType(), 4275 ty->isInstantiationDependentType() || BD->isDependentContext(), 4276 false), 4277 TheBlock(BD) {} 4278 4279 /// \brief Build an empty block expression. 4280 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4281 4282 const BlockDecl *getBlockDecl() const { return TheBlock; } 4283 BlockDecl *getBlockDecl() { return TheBlock; } 4284 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4285 4286 // Convenience functions for probing the underlying BlockDecl. 4287 SourceLocation getCaretLocation() const; 4288 const Stmt *getBody() const; 4289 Stmt *getBody(); 4290 4291 SourceRange getSourceRange() const LLVM_READONLY { 4292 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4293 } 4294 4295 /// getFunctionType - Return the underlying function type for this block. 4296 const FunctionProtoType *getFunctionType() const; 4297 4298 static bool classof(const Stmt *T) { 4299 return T->getStmtClass() == BlockExprClass; 4300 } 4301 static bool classof(const BlockExpr *) { return true; } 4302 4303 // Iterators 4304 child_range children() { return child_range(); } 4305}; 4306 4307/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4308/// This AST node provides support for reinterpreting a type to another 4309/// type of the same size. 4310class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4311private: 4312 Stmt *SrcExpr; 4313 SourceLocation BuiltinLoc, RParenLoc; 4314 4315 friend class ASTReader; 4316 friend class ASTStmtReader; 4317 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4318 4319public: 4320 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4321 ExprValueKind VK, ExprObjectKind OK, 4322 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4323 : Expr(AsTypeExprClass, DstType, VK, OK, 4324 DstType->isDependentType(), 4325 DstType->isDependentType() || SrcExpr->isValueDependent(), 4326 (DstType->isInstantiationDependentType() || 4327 SrcExpr->isInstantiationDependent()), 4328 (DstType->containsUnexpandedParameterPack() || 4329 SrcExpr->containsUnexpandedParameterPack())), 4330 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4331 4332 /// getSrcExpr - Return the Expr to be converted. 4333 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4334 4335 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4336 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4337 4338 /// getRParenLoc - Return the location of final right parenthesis. 4339 SourceLocation getRParenLoc() const { return RParenLoc; } 4340 4341 SourceRange getSourceRange() const LLVM_READONLY { 4342 return SourceRange(BuiltinLoc, RParenLoc); 4343 } 4344 4345 static bool classof(const Stmt *T) { 4346 return T->getStmtClass() == AsTypeExprClass; 4347 } 4348 static bool classof(const AsTypeExpr *) { return true; } 4349 4350 // Iterators 4351 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4352}; 4353 4354/// PseudoObjectExpr - An expression which accesses a pseudo-object 4355/// l-value. A pseudo-object is an abstract object, accesses to which 4356/// are translated to calls. The pseudo-object expression has a 4357/// syntactic form, which shows how the expression was actually 4358/// written in the source code, and a semantic form, which is a series 4359/// of expressions to be executed in order which detail how the 4360/// operation is actually evaluated. Optionally, one of the semantic 4361/// forms may also provide a result value for the expression. 4362/// 4363/// If any of the semantic-form expressions is an OpaqueValueExpr, 4364/// that OVE is required to have a source expression, and it is bound 4365/// to the result of that source expression. Such OVEs may appear 4366/// only in subsequent semantic-form expressions and as 4367/// sub-expressions of the syntactic form. 4368/// 4369/// PseudoObjectExpr should be used only when an operation can be 4370/// usefully described in terms of fairly simple rewrite rules on 4371/// objects and functions that are meant to be used by end-developers. 4372/// For example, under the Itanium ABI, dynamic casts are implemented 4373/// as a call to a runtime function called __dynamic_cast; using this 4374/// class to describe that would be inappropriate because that call is 4375/// not really part of the user-visible semantics, and instead the 4376/// cast is properly reflected in the AST and IR-generation has been 4377/// taught to generate the call as necessary. In contrast, an 4378/// Objective-C property access is semantically defined to be 4379/// equivalent to a particular message send, and this is very much 4380/// part of the user model. The name of this class encourages this 4381/// modelling design. 4382class PseudoObjectExpr : public Expr { 4383 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4384 // Always at least two, because the first sub-expression is the 4385 // syntactic form. 4386 4387 // PseudoObjectExprBits.ResultIndex - The index of the 4388 // sub-expression holding the result. 0 means the result is void, 4389 // which is unambiguous because it's the index of the syntactic 4390 // form. Note that this is therefore 1 higher than the value passed 4391 // in to Create, which is an index within the semantic forms. 4392 // Note also that ASTStmtWriter assumes this encoding. 4393 4394 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); } 4395 const Expr * const *getSubExprsBuffer() const { 4396 return reinterpret_cast<const Expr * const *>(this + 1); 4397 } 4398 4399 friend class ASTStmtReader; 4400 4401 PseudoObjectExpr(QualType type, ExprValueKind VK, 4402 Expr *syntactic, ArrayRef<Expr*> semantic, 4403 unsigned resultIndex); 4404 4405 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4406 4407 unsigned getNumSubExprs() const { 4408 return PseudoObjectExprBits.NumSubExprs; 4409 } 4410 4411public: 4412 /// NoResult - A value for the result index indicating that there is 4413 /// no semantic result. 4414 enum { NoResult = ~0U }; 4415 4416 static PseudoObjectExpr *Create(ASTContext &Context, Expr *syntactic, 4417 ArrayRef<Expr*> semantic, 4418 unsigned resultIndex); 4419 4420 static PseudoObjectExpr *Create(ASTContext &Context, EmptyShell shell, 4421 unsigned numSemanticExprs); 4422 4423 /// Return the syntactic form of this expression, i.e. the 4424 /// expression it actually looks like. Likely to be expressed in 4425 /// terms of OpaqueValueExprs bound in the semantic form. 4426 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 4427 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 4428 4429 /// Return the index of the result-bearing expression into the semantics 4430 /// expressions, or PseudoObjectExpr::NoResult if there is none. 4431 unsigned getResultExprIndex() const { 4432 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 4433 return PseudoObjectExprBits.ResultIndex - 1; 4434 } 4435 4436 /// Return the result-bearing expression, or null if there is none. 4437 Expr *getResultExpr() { 4438 if (PseudoObjectExprBits.ResultIndex == 0) 4439 return 0; 4440 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 4441 } 4442 const Expr *getResultExpr() const { 4443 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 4444 } 4445 4446 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 4447 4448 typedef Expr * const *semantics_iterator; 4449 typedef const Expr * const *const_semantics_iterator; 4450 semantics_iterator semantics_begin() { 4451 return getSubExprsBuffer() + 1; 4452 } 4453 const_semantics_iterator semantics_begin() const { 4454 return getSubExprsBuffer() + 1; 4455 } 4456 semantics_iterator semantics_end() { 4457 return getSubExprsBuffer() + getNumSubExprs(); 4458 } 4459 const_semantics_iterator semantics_end() const { 4460 return getSubExprsBuffer() + getNumSubExprs(); 4461 } 4462 Expr *getSemanticExpr(unsigned index) { 4463 assert(index + 1 < getNumSubExprs()); 4464 return getSubExprsBuffer()[index + 1]; 4465 } 4466 const Expr *getSemanticExpr(unsigned index) const { 4467 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 4468 } 4469 4470 SourceLocation getExprLoc() const LLVM_READONLY { 4471 return getSyntacticForm()->getExprLoc(); 4472 } 4473 SourceRange getSourceRange() const LLVM_READONLY { 4474 return getSyntacticForm()->getSourceRange(); 4475 } 4476 4477 child_range children() { 4478 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer()); 4479 return child_range(cs, cs + getNumSubExprs()); 4480 } 4481 4482 static bool classof(const Stmt *T) { 4483 return T->getStmtClass() == PseudoObjectExprClass; 4484 } 4485 static bool classof(const PseudoObjectExpr *) { return true; } 4486}; 4487 4488/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4489/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4490/// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>. 4491/// All of these instructions take one primary pointer and at least one memory 4492/// order. 4493class AtomicExpr : public Expr { 4494public: 4495 enum AtomicOp { 4496#define BUILTIN(ID, TYPE, ATTRS) 4497#define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID, 4498#include "clang/Basic/Builtins.def" 4499 // Avoid trailing comma 4500 BI_First = 0 4501 }; 4502 4503private: 4504 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR }; 4505 Stmt* SubExprs[END_EXPR]; 4506 unsigned NumSubExprs; 4507 SourceLocation BuiltinLoc, RParenLoc; 4508 AtomicOp Op; 4509 4510 friend class ASTStmtReader; 4511 4512public: 4513 AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, QualType t, 4514 AtomicOp op, SourceLocation RP); 4515 4516 /// \brief Determine the number of arguments the specified atomic builtin 4517 /// should have. 4518 static unsigned getNumSubExprs(AtomicOp Op); 4519 4520 /// \brief Build an empty AtomicExpr. 4521 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4522 4523 Expr *getPtr() const { 4524 return cast<Expr>(SubExprs[PTR]); 4525 } 4526 Expr *getOrder() const { 4527 return cast<Expr>(SubExprs[ORDER]); 4528 } 4529 Expr *getVal1() const { 4530 if (Op == AO__c11_atomic_init) 4531 return cast<Expr>(SubExprs[ORDER]); 4532 assert(NumSubExprs > VAL1); 4533 return cast<Expr>(SubExprs[VAL1]); 4534 } 4535 Expr *getOrderFail() const { 4536 assert(NumSubExprs > ORDER_FAIL); 4537 return cast<Expr>(SubExprs[ORDER_FAIL]); 4538 } 4539 Expr *getVal2() const { 4540 if (Op == AO__atomic_exchange) 4541 return cast<Expr>(SubExprs[ORDER_FAIL]); 4542 assert(NumSubExprs > VAL2); 4543 return cast<Expr>(SubExprs[VAL2]); 4544 } 4545 Expr *getWeak() const { 4546 assert(NumSubExprs > WEAK); 4547 return cast<Expr>(SubExprs[WEAK]); 4548 } 4549 4550 AtomicOp getOp() const { return Op; } 4551 unsigned getNumSubExprs() { return NumSubExprs; } 4552 4553 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4554 4555 bool isVolatile() const { 4556 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4557 } 4558 4559 bool isCmpXChg() const { 4560 return getOp() == AO__c11_atomic_compare_exchange_strong || 4561 getOp() == AO__c11_atomic_compare_exchange_weak || 4562 getOp() == AO__atomic_compare_exchange || 4563 getOp() == AO__atomic_compare_exchange_n; 4564 } 4565 4566 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4567 SourceLocation getRParenLoc() const { return RParenLoc; } 4568 4569 SourceRange getSourceRange() const LLVM_READONLY { 4570 return SourceRange(BuiltinLoc, RParenLoc); 4571 } 4572 static bool classof(const Stmt *T) { 4573 return T->getStmtClass() == AtomicExprClass; 4574 } 4575 static bool classof(const AtomicExpr *) { return true; } 4576 4577 // Iterators 4578 child_range children() { 4579 return child_range(SubExprs, SubExprs+NumSubExprs); 4580 } 4581}; 4582} // end namespace clang 4583 4584#endif 4585