Expr.h revision c49bd11f96c2378969822f1f1b814ffa8f2bfee4
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/AST/UsuallyTinyPtrVector.h" 25#include "clang/Basic/TypeTraits.h" 26#include "llvm/ADT/APSInt.h" 27#include "llvm/ADT/APFloat.h" 28#include "llvm/ADT/SmallVector.h" 29#include "llvm/ADT/StringRef.h" 30#include <cctype> 31 32namespace clang { 33 class ASTContext; 34 class APValue; 35 class Decl; 36 class IdentifierInfo; 37 class ParmVarDecl; 38 class NamedDecl; 39 class ValueDecl; 40 class BlockDecl; 41 class CXXBaseSpecifier; 42 class CXXOperatorCallExpr; 43 class CXXMemberCallExpr; 44 class ObjCPropertyRefExpr; 45 class OpaqueValueExpr; 46 47/// \brief A simple array of base specifiers. 48typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 49 50/// Expr - This represents one expression. Note that Expr's are subclasses of 51/// Stmt. This allows an expression to be transparently used any place a Stmt 52/// is required. 53/// 54class Expr : public Stmt { 55 QualType TR; 56 57protected: 58 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 59 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 60 : Stmt(SC) 61 { 62 ExprBits.TypeDependent = TD; 63 ExprBits.ValueDependent = VD; 64 ExprBits.InstantiationDependent = ID; 65 ExprBits.ValueKind = VK; 66 ExprBits.ObjectKind = OK; 67 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 68 setType(T); 69 } 70 71 /// \brief Construct an empty expression. 72 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 73 74public: 75 QualType getType() const { return TR; } 76 void setType(QualType t) { 77 // In C++, the type of an expression is always adjusted so that it 78 // will not have reference type an expression will never have 79 // reference type (C++ [expr]p6). Use 80 // QualType::getNonReferenceType() to retrieve the non-reference 81 // type. Additionally, inspect Expr::isLvalue to determine whether 82 // an expression that is adjusted in this manner should be 83 // considered an lvalue. 84 assert((t.isNull() || !t->isReferenceType()) && 85 "Expressions can't have reference type"); 86 87 TR = t; 88 } 89 90 /// isValueDependent - Determines whether this expression is 91 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 92 /// array bound of "Chars" in the following example is 93 /// value-dependent. 94 /// @code 95 /// template<int Size, char (&Chars)[Size]> struct meta_string; 96 /// @endcode 97 bool isValueDependent() const { return ExprBits.ValueDependent; } 98 99 /// \brief Set whether this expression is value-dependent or not. 100 void setValueDependent(bool VD) { 101 ExprBits.ValueDependent = VD; 102 if (VD) 103 ExprBits.InstantiationDependent = true; 104 } 105 106 /// isTypeDependent - Determines whether this expression is 107 /// type-dependent (C++ [temp.dep.expr]), which means that its type 108 /// could change from one template instantiation to the next. For 109 /// example, the expressions "x" and "x + y" are type-dependent in 110 /// the following code, but "y" is not type-dependent: 111 /// @code 112 /// template<typename T> 113 /// void add(T x, int y) { 114 /// x + y; 115 /// } 116 /// @endcode 117 bool isTypeDependent() const { return ExprBits.TypeDependent; } 118 119 /// \brief Set whether this expression is type-dependent or not. 120 void setTypeDependent(bool TD) { 121 ExprBits.TypeDependent = TD; 122 if (TD) 123 ExprBits.InstantiationDependent = true; 124 } 125 126 /// \brief Whether this expression is instantiation-dependent, meaning that 127 /// it depends in some way on a template parameter, even if neither its type 128 /// nor (constant) value can change due to the template instantiation. 129 /// 130 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 131 /// instantiation-dependent (since it involves a template parameter \c T), but 132 /// is neither type- nor value-dependent, since the type of the inner 133 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 134 /// \c sizeof is known. 135 /// 136 /// \code 137 /// template<typename T> 138 /// void f(T x, T y) { 139 /// sizeof(sizeof(T() + T()); 140 /// } 141 /// \endcode 142 /// 143 bool isInstantiationDependent() const { 144 return ExprBits.InstantiationDependent; 145 } 146 147 /// \brief Set whether this expression is instantiation-dependent or not. 148 void setInstantiationDependent(bool ID) { 149 ExprBits.InstantiationDependent = ID; 150 } 151 152 /// \brief Whether this expression contains an unexpanded parameter 153 /// pack (for C++0x variadic templates). 154 /// 155 /// Given the following function template: 156 /// 157 /// \code 158 /// template<typename F, typename ...Types> 159 /// void forward(const F &f, Types &&...args) { 160 /// f(static_cast<Types&&>(args)...); 161 /// } 162 /// \endcode 163 /// 164 /// The expressions \c args and \c static_cast<Types&&>(args) both 165 /// contain parameter packs. 166 bool containsUnexpandedParameterPack() const { 167 return ExprBits.ContainsUnexpandedParameterPack; 168 } 169 170 /// \brief Set the bit that describes whether this expression 171 /// contains an unexpanded parameter pack. 172 void setContainsUnexpandedParameterPack(bool PP = true) { 173 ExprBits.ContainsUnexpandedParameterPack = PP; 174 } 175 176 /// getExprLoc - Return the preferred location for the arrow when diagnosing 177 /// a problem with a generic expression. 178 SourceLocation getExprLoc() const; 179 180 /// isUnusedResultAWarning - Return true if this immediate expression should 181 /// be warned about if the result is unused. If so, fill in Loc and Ranges 182 /// with location to warn on and the source range[s] to report with the 183 /// warning. 184 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 185 SourceRange &R2, ASTContext &Ctx) const; 186 187 /// isLValue - True if this expression is an "l-value" according to 188 /// the rules of the current language. C and C++ give somewhat 189 /// different rules for this concept, but in general, the result of 190 /// an l-value expression identifies a specific object whereas the 191 /// result of an r-value expression is a value detached from any 192 /// specific storage. 193 /// 194 /// C++0x divides the concept of "r-value" into pure r-values 195 /// ("pr-values") and so-called expiring values ("x-values"), which 196 /// identify specific objects that can be safely cannibalized for 197 /// their resources. This is an unfortunate abuse of terminology on 198 /// the part of the C++ committee. In Clang, when we say "r-value", 199 /// we generally mean a pr-value. 200 bool isLValue() const { return getValueKind() == VK_LValue; } 201 bool isRValue() const { return getValueKind() == VK_RValue; } 202 bool isXValue() const { return getValueKind() == VK_XValue; } 203 bool isGLValue() const { return getValueKind() != VK_RValue; } 204 205 enum LValueClassification { 206 LV_Valid, 207 LV_NotObjectType, 208 LV_IncompleteVoidType, 209 LV_DuplicateVectorComponents, 210 LV_InvalidExpression, 211 LV_InvalidMessageExpression, 212 LV_MemberFunction, 213 LV_SubObjCPropertySetting, 214 LV_ClassTemporary 215 }; 216 /// Reasons why an expression might not be an l-value. 217 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 218 219 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 220 /// does not have an incomplete type, does not have a const-qualified type, 221 /// and if it is a structure or union, does not have any member (including, 222 /// recursively, any member or element of all contained aggregates or unions) 223 /// with a const-qualified type. 224 /// 225 /// \param Loc [in] [out] - A source location which *may* be filled 226 /// in with the location of the expression making this a 227 /// non-modifiable lvalue, if specified. 228 enum isModifiableLvalueResult { 229 MLV_Valid, 230 MLV_NotObjectType, 231 MLV_IncompleteVoidType, 232 MLV_DuplicateVectorComponents, 233 MLV_InvalidExpression, 234 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 235 MLV_IncompleteType, 236 MLV_ConstQualified, 237 MLV_ArrayType, 238 MLV_NotBlockQualified, 239 MLV_ReadonlyProperty, 240 MLV_NoSetterProperty, 241 MLV_MemberFunction, 242 MLV_SubObjCPropertySetting, 243 MLV_InvalidMessageExpression, 244 MLV_ClassTemporary 245 }; 246 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 247 SourceLocation *Loc = 0) const; 248 249 /// \brief The return type of classify(). Represents the C++0x expression 250 /// taxonomy. 251 class Classification { 252 public: 253 /// \brief The various classification results. Most of these mean prvalue. 254 enum Kinds { 255 CL_LValue, 256 CL_XValue, 257 CL_Function, // Functions cannot be lvalues in C. 258 CL_Void, // Void cannot be an lvalue in C. 259 CL_AddressableVoid, // Void expression whose address can be taken in C. 260 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 261 CL_MemberFunction, // An expression referring to a member function 262 CL_SubObjCPropertySetting, 263 CL_ClassTemporary, // A prvalue of class type 264 CL_ObjCMessageRValue, // ObjC message is an rvalue 265 CL_PRValue // A prvalue for any other reason, of any other type 266 }; 267 /// \brief The results of modification testing. 268 enum ModifiableType { 269 CM_Untested, // testModifiable was false. 270 CM_Modifiable, 271 CM_RValue, // Not modifiable because it's an rvalue 272 CM_Function, // Not modifiable because it's a function; C++ only 273 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 274 CM_NotBlockQualified, // Not captured in the closure 275 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 276 CM_ConstQualified, 277 CM_ArrayType, 278 CM_IncompleteType 279 }; 280 281 private: 282 friend class Expr; 283 284 unsigned short Kind; 285 unsigned short Modifiable; 286 287 explicit Classification(Kinds k, ModifiableType m) 288 : Kind(k), Modifiable(m) 289 {} 290 291 public: 292 Classification() {} 293 294 Kinds getKind() const { return static_cast<Kinds>(Kind); } 295 ModifiableType getModifiable() const { 296 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 297 return static_cast<ModifiableType>(Modifiable); 298 } 299 bool isLValue() const { return Kind == CL_LValue; } 300 bool isXValue() const { return Kind == CL_XValue; } 301 bool isGLValue() const { return Kind <= CL_XValue; } 302 bool isPRValue() const { return Kind >= CL_Function; } 303 bool isRValue() const { return Kind >= CL_XValue; } 304 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 305 306 /// \brief Create a simple, modifiably lvalue 307 static Classification makeSimpleLValue() { 308 return Classification(CL_LValue, CM_Modifiable); 309 } 310 311 }; 312 /// \brief Classify - Classify this expression according to the C++0x 313 /// expression taxonomy. 314 /// 315 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 316 /// old lvalue vs rvalue. This function determines the type of expression this 317 /// is. There are three expression types: 318 /// - lvalues are classical lvalues as in C++03. 319 /// - prvalues are equivalent to rvalues in C++03. 320 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 321 /// function returning an rvalue reference. 322 /// lvalues and xvalues are collectively referred to as glvalues, while 323 /// prvalues and xvalues together form rvalues. 324 Classification Classify(ASTContext &Ctx) const { 325 return ClassifyImpl(Ctx, 0); 326 } 327 328 /// \brief ClassifyModifiable - Classify this expression according to the 329 /// C++0x expression taxonomy, and see if it is valid on the left side 330 /// of an assignment. 331 /// 332 /// This function extends classify in that it also tests whether the 333 /// expression is modifiable (C99 6.3.2.1p1). 334 /// \param Loc A source location that might be filled with a relevant location 335 /// if the expression is not modifiable. 336 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 337 return ClassifyImpl(Ctx, &Loc); 338 } 339 340 /// getValueKindForType - Given a formal return or parameter type, 341 /// give its value kind. 342 static ExprValueKind getValueKindForType(QualType T) { 343 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 344 return (isa<LValueReferenceType>(RT) 345 ? VK_LValue 346 : (RT->getPointeeType()->isFunctionType() 347 ? VK_LValue : VK_XValue)); 348 return VK_RValue; 349 } 350 351 /// getValueKind - The value kind that this expression produces. 352 ExprValueKind getValueKind() const { 353 return static_cast<ExprValueKind>(ExprBits.ValueKind); 354 } 355 356 /// getObjectKind - The object kind that this expression produces. 357 /// Object kinds are meaningful only for expressions that yield an 358 /// l-value or x-value. 359 ExprObjectKind getObjectKind() const { 360 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 361 } 362 363 bool isOrdinaryOrBitFieldObject() const { 364 ExprObjectKind OK = getObjectKind(); 365 return (OK == OK_Ordinary || OK == OK_BitField); 366 } 367 368 /// setValueKind - Set the value kind produced by this expression. 369 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 370 371 /// setObjectKind - Set the object kind produced by this expression. 372 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 373 374private: 375 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 376 377public: 378 379 /// \brief If this expression refers to a bit-field, retrieve the 380 /// declaration of that bit-field. 381 FieldDecl *getBitField(); 382 383 const FieldDecl *getBitField() const { 384 return const_cast<Expr*>(this)->getBitField(); 385 } 386 387 /// \brief If this expression is an l-value for an Objective C 388 /// property, find the underlying property reference expression. 389 const ObjCPropertyRefExpr *getObjCProperty() const; 390 391 /// \brief Returns whether this expression refers to a vector element. 392 bool refersToVectorElement() const; 393 394 /// \brief Returns whether this expression has a placeholder type. 395 bool hasPlaceholderType() const { 396 return getType()->isPlaceholderType(); 397 } 398 399 /// \brief Returns whether this expression has a specific placeholder type. 400 bool hasPlaceholderType(BuiltinType::Kind K) const { 401 assert(BuiltinType::isPlaceholderTypeKind(K)); 402 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 403 return BT->getKind() == K; 404 return false; 405 } 406 407 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 408 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 409 /// but also int expressions which are produced by things like comparisons in 410 /// C. 411 bool isKnownToHaveBooleanValue() const; 412 413 /// isIntegerConstantExpr - Return true if this expression is a valid integer 414 /// constant expression, and, if so, return its value in Result. If not a 415 /// valid i-c-e, return false and fill in Loc (if specified) with the location 416 /// of the invalid expression. 417 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 418 SourceLocation *Loc = 0, 419 bool isEvaluated = true) const; 420 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 421 llvm::APSInt X; 422 return isIntegerConstantExpr(X, Ctx, Loc); 423 } 424 /// isConstantInitializer - Returns true if this expression is a constant 425 /// initializer, which can be emitted at compile-time. 426 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 427 428 /// EvalStatus is a struct with detailed info about an evaluation in progress. 429 struct EvalStatus { 430 /// HasSideEffects - Whether the evaluated expression has side effects. 431 /// For example, (f() && 0) can be folded, but it still has side effects. 432 bool HasSideEffects; 433 434 /// Diag - If the expression is unfoldable, then Diag contains a note 435 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 436 /// position for the error, and DiagExpr is the expression that caused 437 /// the error. 438 /// If the expression is foldable, but not an integer constant expression, 439 /// Diag contains a note diagnostic that describes why it isn't an integer 440 /// constant expression. If the expression *is* an integer constant 441 /// expression, then Diag will be zero. 442 unsigned Diag; 443 const Expr *DiagExpr; 444 SourceLocation DiagLoc; 445 446 EvalStatus() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 447 448 // hasSideEffects - Return true if the evaluated expression has 449 // side effects. 450 bool hasSideEffects() const { 451 return HasSideEffects; 452 } 453 }; 454 455 /// EvalResult is a struct with detailed info about an evaluated expression. 456 struct EvalResult : EvalStatus { 457 /// Val - This is the value the expression can be folded to. 458 APValue Val; 459 460 // isGlobalLValue - Return true if the evaluated lvalue expression 461 // is global. 462 bool isGlobalLValue() const; 463 }; 464 465 /// Evaluate - Return true if this is a constant which we can fold using 466 /// any crazy technique (that has nothing to do with language standards) that 467 /// we want to. If this function returns true, it returns the folded constant 468 /// in Result. If this expression is a glvalue, an lvalue-to-rvalue conversion 469 /// will be applied. 470 bool Evaluate(EvalResult &Result, const ASTContext &Ctx) const; 471 472 /// EvaluateAsBooleanCondition - Return true if this is a constant 473 /// which we we can fold and convert to a boolean condition using 474 /// any crazy technique that we want to, even if the expression has 475 /// side-effects. 476 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 477 478 /// EvaluateAsInt - Return true if this is a constant which we can fold and 479 /// convert to an integer using any crazy technique that we want to. 480 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx) const; 481 482 /// isEvaluatable - Call Evaluate to see if this expression can be constant 483 /// folded, but discard the result. 484 bool isEvaluatable(const ASTContext &Ctx) const; 485 486 /// HasSideEffects - This routine returns true for all those expressions 487 /// which must be evaluated each time and must not be optimized away 488 /// or evaluated at compile time. Example is a function call, volatile 489 /// variable read. 490 bool HasSideEffects(const ASTContext &Ctx) const; 491 492 /// EvaluateKnownConstInt - Call Evaluate and return the folded integer. This 493 /// must be called on an expression that constant folds to an integer. 494 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 495 496 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 497 /// with link time known address. 498 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 499 500 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue. 501 bool EvaluateAsAnyLValue(EvalResult &Result, const ASTContext &Ctx) const; 502 503 /// \brief Enumeration used to describe the kind of Null pointer constant 504 /// returned from \c isNullPointerConstant(). 505 enum NullPointerConstantKind { 506 /// \brief Expression is not a Null pointer constant. 507 NPCK_NotNull = 0, 508 509 /// \brief Expression is a Null pointer constant built from a zero integer. 510 NPCK_ZeroInteger, 511 512 /// \brief Expression is a C++0X nullptr. 513 NPCK_CXX0X_nullptr, 514 515 /// \brief Expression is a GNU-style __null constant. 516 NPCK_GNUNull 517 }; 518 519 /// \brief Enumeration used to describe how \c isNullPointerConstant() 520 /// should cope with value-dependent expressions. 521 enum NullPointerConstantValueDependence { 522 /// \brief Specifies that the expression should never be value-dependent. 523 NPC_NeverValueDependent = 0, 524 525 /// \brief Specifies that a value-dependent expression of integral or 526 /// dependent type should be considered a null pointer constant. 527 NPC_ValueDependentIsNull, 528 529 /// \brief Specifies that a value-dependent expression should be considered 530 /// to never be a null pointer constant. 531 NPC_ValueDependentIsNotNull 532 }; 533 534 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 535 /// a Null pointer constant. The return value can further distinguish the 536 /// kind of NULL pointer constant that was detected. 537 NullPointerConstantKind isNullPointerConstant( 538 ASTContext &Ctx, 539 NullPointerConstantValueDependence NPC) const; 540 541 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 542 /// write barrier. 543 bool isOBJCGCCandidate(ASTContext &Ctx) const; 544 545 /// \brief Returns true if this expression is a bound member function. 546 bool isBoundMemberFunction(ASTContext &Ctx) const; 547 548 /// \brief Given an expression of bound-member type, find the type 549 /// of the member. Returns null if this is an *overloaded* bound 550 /// member expression. 551 static QualType findBoundMemberType(const Expr *expr); 552 553 /// \brief Result type of CanThrow(). 554 enum CanThrowResult { 555 CT_Cannot, 556 CT_Dependent, 557 CT_Can 558 }; 559 /// \brief Test if this expression, if evaluated, might throw, according to 560 /// the rules of C++ [expr.unary.noexcept]. 561 CanThrowResult CanThrow(ASTContext &C) const; 562 563 /// IgnoreImpCasts - Skip past any implicit casts which might 564 /// surround this expression. Only skips ImplicitCastExprs. 565 Expr *IgnoreImpCasts(); 566 567 /// IgnoreImplicit - Skip past any implicit AST nodes which might 568 /// surround this expression. 569 Expr *IgnoreImplicit() { return cast<Expr>(Stmt::IgnoreImplicit()); } 570 571 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 572 /// its subexpression. If that subexpression is also a ParenExpr, 573 /// then this method recursively returns its subexpression, and so forth. 574 /// Otherwise, the method returns the current Expr. 575 Expr *IgnoreParens(); 576 577 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 578 /// or CastExprs, returning their operand. 579 Expr *IgnoreParenCasts(); 580 581 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 582 /// ParenExpr or ImplicitCastExprs, returning their operand. 583 Expr *IgnoreParenImpCasts(); 584 585 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 586 /// call to a conversion operator, return the argument. 587 Expr *IgnoreConversionOperator(); 588 589 const Expr *IgnoreConversionOperator() const { 590 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 591 } 592 593 const Expr *IgnoreParenImpCasts() const { 594 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 595 } 596 597 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 598 /// CastExprs that represent lvalue casts, returning their operand. 599 Expr *IgnoreParenLValueCasts(); 600 601 const Expr *IgnoreParenLValueCasts() const { 602 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 603 } 604 605 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 606 /// value (including ptr->int casts of the same size). Strip off any 607 /// ParenExpr or CastExprs, returning their operand. 608 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 609 610 /// \brief Determine whether this expression is a default function argument. 611 /// 612 /// Default arguments are implicitly generated in the abstract syntax tree 613 /// by semantic analysis for function calls, object constructions, etc. in 614 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 615 /// this routine also looks through any implicit casts to determine whether 616 /// the expression is a default argument. 617 bool isDefaultArgument() const; 618 619 /// \brief Determine whether the result of this expression is a 620 /// temporary object of the given class type. 621 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 622 623 /// \brief Whether this expression is an implicit reference to 'this' in C++. 624 bool isImplicitCXXThis() const; 625 626 const Expr *IgnoreImpCasts() const { 627 return const_cast<Expr*>(this)->IgnoreImpCasts(); 628 } 629 const Expr *IgnoreParens() const { 630 return const_cast<Expr*>(this)->IgnoreParens(); 631 } 632 const Expr *IgnoreParenCasts() const { 633 return const_cast<Expr*>(this)->IgnoreParenCasts(); 634 } 635 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 636 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 637 } 638 639 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 640 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 641 642 static bool classof(const Stmt *T) { 643 return T->getStmtClass() >= firstExprConstant && 644 T->getStmtClass() <= lastExprConstant; 645 } 646 static bool classof(const Expr *) { return true; } 647}; 648 649 650//===----------------------------------------------------------------------===// 651// Primary Expressions. 652//===----------------------------------------------------------------------===// 653 654/// OpaqueValueExpr - An expression referring to an opaque object of a 655/// fixed type and value class. These don't correspond to concrete 656/// syntax; instead they're used to express operations (usually copy 657/// operations) on values whose source is generally obvious from 658/// context. 659class OpaqueValueExpr : public Expr { 660 friend class ASTStmtReader; 661 Expr *SourceExpr; 662 SourceLocation Loc; 663 664public: 665 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 666 ExprObjectKind OK = OK_Ordinary) 667 : Expr(OpaqueValueExprClass, T, VK, OK, 668 T->isDependentType(), T->isDependentType(), 669 T->isInstantiationDependentType(), 670 false), 671 SourceExpr(0), Loc(Loc) { 672 } 673 674 /// Given an expression which invokes a copy constructor --- i.e. a 675 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 676 /// find the OpaqueValueExpr that's the source of the construction. 677 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 678 679 explicit OpaqueValueExpr(EmptyShell Empty) 680 : Expr(OpaqueValueExprClass, Empty) { } 681 682 /// \brief Retrieve the location of this expression. 683 SourceLocation getLocation() const { return Loc; } 684 685 SourceRange getSourceRange() const { 686 if (SourceExpr) return SourceExpr->getSourceRange(); 687 return Loc; 688 } 689 SourceLocation getExprLoc() const { 690 if (SourceExpr) return SourceExpr->getExprLoc(); 691 return Loc; 692 } 693 694 child_range children() { return child_range(); } 695 696 /// The source expression of an opaque value expression is the 697 /// expression which originally generated the value. This is 698 /// provided as a convenience for analyses that don't wish to 699 /// precisely model the execution behavior of the program. 700 /// 701 /// The source expression is typically set when building the 702 /// expression which binds the opaque value expression in the first 703 /// place. 704 Expr *getSourceExpr() const { return SourceExpr; } 705 void setSourceExpr(Expr *e) { SourceExpr = e; } 706 707 static bool classof(const Stmt *T) { 708 return T->getStmtClass() == OpaqueValueExprClass; 709 } 710 static bool classof(const OpaqueValueExpr *) { return true; } 711}; 712 713/// \brief A reference to a declared variable, function, enum, etc. 714/// [C99 6.5.1p2] 715/// 716/// This encodes all the information about how a declaration is referenced 717/// within an expression. 718/// 719/// There are several optional constructs attached to DeclRefExprs only when 720/// they apply in order to conserve memory. These are laid out past the end of 721/// the object, and flags in the DeclRefExprBitfield track whether they exist: 722/// 723/// DeclRefExprBits.HasQualifier: 724/// Specifies when this declaration reference expression has a C++ 725/// nested-name-specifier. 726/// DeclRefExprBits.HasFoundDecl: 727/// Specifies when this declaration reference expression has a record of 728/// a NamedDecl (different from the referenced ValueDecl) which was found 729/// during name lookup and/or overload resolution. 730/// DeclRefExprBits.HasExplicitTemplateArgs: 731/// Specifies when this declaration reference expression has an explicit 732/// C++ template argument list. 733class DeclRefExpr : public Expr { 734 /// \brief The declaration that we are referencing. 735 ValueDecl *D; 736 737 /// \brief The location of the declaration name itself. 738 SourceLocation Loc; 739 740 /// \brief Provides source/type location info for the declaration name 741 /// embedded in D. 742 DeclarationNameLoc DNLoc; 743 744 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 745 NestedNameSpecifierLoc &getInternalQualifierLoc() { 746 assert(hasQualifier()); 747 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 748 } 749 750 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 751 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 752 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 753 } 754 755 /// \brief Test whether there is a distinct FoundDecl attached to the end of 756 /// this DRE. 757 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 758 759 /// \brief Helper to retrieve the optional NamedDecl through which this 760 /// reference occured. 761 NamedDecl *&getInternalFoundDecl() { 762 assert(hasFoundDecl()); 763 if (hasQualifier()) 764 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 765 return *reinterpret_cast<NamedDecl **>(this + 1); 766 } 767 768 /// \brief Helper to retrieve the optional NamedDecl through which this 769 /// reference occured. 770 NamedDecl *getInternalFoundDecl() const { 771 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 772 } 773 774 DeclRefExpr(NestedNameSpecifierLoc QualifierLoc, 775 ValueDecl *D, const DeclarationNameInfo &NameInfo, 776 NamedDecl *FoundD, 777 const TemplateArgumentListInfo *TemplateArgs, 778 QualType T, ExprValueKind VK); 779 780 /// \brief Construct an empty declaration reference expression. 781 explicit DeclRefExpr(EmptyShell Empty) 782 : Expr(DeclRefExprClass, Empty) { } 783 784 /// \brief Computes the type- and value-dependence flags for this 785 /// declaration reference expression. 786 void computeDependence(); 787 788public: 789 DeclRefExpr(ValueDecl *D, QualType T, ExprValueKind VK, SourceLocation L, 790 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 791 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 792 D(D), Loc(L), DNLoc(LocInfo) { 793 DeclRefExprBits.HasQualifier = 0; 794 DeclRefExprBits.HasExplicitTemplateArgs = 0; 795 DeclRefExprBits.HasFoundDecl = 0; 796 DeclRefExprBits.HadMultipleCandidates = 0; 797 computeDependence(); 798 } 799 800 static DeclRefExpr *Create(ASTContext &Context, 801 NestedNameSpecifierLoc QualifierLoc, 802 ValueDecl *D, 803 SourceLocation NameLoc, 804 QualType T, ExprValueKind VK, 805 NamedDecl *FoundD = 0, 806 const TemplateArgumentListInfo *TemplateArgs = 0); 807 808 static DeclRefExpr *Create(ASTContext &Context, 809 NestedNameSpecifierLoc QualifierLoc, 810 ValueDecl *D, 811 const DeclarationNameInfo &NameInfo, 812 QualType T, ExprValueKind VK, 813 NamedDecl *FoundD = 0, 814 const TemplateArgumentListInfo *TemplateArgs = 0); 815 816 /// \brief Construct an empty declaration reference expression. 817 static DeclRefExpr *CreateEmpty(ASTContext &Context, 818 bool HasQualifier, 819 bool HasFoundDecl, 820 bool HasExplicitTemplateArgs, 821 unsigned NumTemplateArgs); 822 823 ValueDecl *getDecl() { return D; } 824 const ValueDecl *getDecl() const { return D; } 825 void setDecl(ValueDecl *NewD) { D = NewD; } 826 827 DeclarationNameInfo getNameInfo() const { 828 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 829 } 830 831 SourceLocation getLocation() const { return Loc; } 832 void setLocation(SourceLocation L) { Loc = L; } 833 SourceRange getSourceRange() const; 834 835 /// \brief Determine whether this declaration reference was preceded by a 836 /// C++ nested-name-specifier, e.g., \c N::foo. 837 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 838 839 /// \brief If the name was qualified, retrieves the nested-name-specifier 840 /// that precedes the name. Otherwise, returns NULL. 841 NestedNameSpecifier *getQualifier() const { 842 if (!hasQualifier()) 843 return 0; 844 845 return getInternalQualifierLoc().getNestedNameSpecifier(); 846 } 847 848 /// \brief If the name was qualified, retrieves the nested-name-specifier 849 /// that precedes the name, with source-location information. 850 NestedNameSpecifierLoc getQualifierLoc() const { 851 if (!hasQualifier()) 852 return NestedNameSpecifierLoc(); 853 854 return getInternalQualifierLoc(); 855 } 856 857 /// \brief Get the NamedDecl through which this reference occured. 858 /// 859 /// This Decl may be different from the ValueDecl actually referred to in the 860 /// presence of using declarations, etc. It always returns non-NULL, and may 861 /// simple return the ValueDecl when appropriate. 862 NamedDecl *getFoundDecl() { 863 return hasFoundDecl() ? getInternalFoundDecl() : D; 864 } 865 866 /// \brief Get the NamedDecl through which this reference occurred. 867 /// See non-const variant. 868 const NamedDecl *getFoundDecl() const { 869 return hasFoundDecl() ? getInternalFoundDecl() : D; 870 } 871 872 /// \brief Determines whether this declaration reference was followed by an 873 /// explict template argument list. 874 bool hasExplicitTemplateArgs() const { 875 return DeclRefExprBits.HasExplicitTemplateArgs; 876 } 877 878 /// \brief Retrieve the explicit template argument list that followed the 879 /// member template name. 880 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 881 assert(hasExplicitTemplateArgs()); 882 if (hasFoundDecl()) 883 return *reinterpret_cast<ASTTemplateArgumentListInfo *>( 884 &getInternalFoundDecl() + 1); 885 886 if (hasQualifier()) 887 return *reinterpret_cast<ASTTemplateArgumentListInfo *>( 888 &getInternalQualifierLoc() + 1); 889 890 return *reinterpret_cast<ASTTemplateArgumentListInfo *>(this + 1); 891 } 892 893 /// \brief Retrieve the explicit template argument list that followed the 894 /// member template name. 895 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 896 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 897 } 898 899 /// \brief Retrieves the optional explicit template arguments. 900 /// This points to the same data as getExplicitTemplateArgs(), but 901 /// returns null if there are no explicit template arguments. 902 const ASTTemplateArgumentListInfo *getExplicitTemplateArgsOpt() const { 903 if (!hasExplicitTemplateArgs()) return 0; 904 return &getExplicitTemplateArgs(); 905 } 906 907 /// \brief Copies the template arguments (if present) into the given 908 /// structure. 909 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 910 if (hasExplicitTemplateArgs()) 911 getExplicitTemplateArgs().copyInto(List); 912 } 913 914 /// \brief Retrieve the location of the left angle bracket following the 915 /// member name ('<'), if any. 916 SourceLocation getLAngleLoc() const { 917 if (!hasExplicitTemplateArgs()) 918 return SourceLocation(); 919 920 return getExplicitTemplateArgs().LAngleLoc; 921 } 922 923 /// \brief Retrieve the template arguments provided as part of this 924 /// template-id. 925 const TemplateArgumentLoc *getTemplateArgs() const { 926 if (!hasExplicitTemplateArgs()) 927 return 0; 928 929 return getExplicitTemplateArgs().getTemplateArgs(); 930 } 931 932 /// \brief Retrieve the number of template arguments provided as part of this 933 /// template-id. 934 unsigned getNumTemplateArgs() const { 935 if (!hasExplicitTemplateArgs()) 936 return 0; 937 938 return getExplicitTemplateArgs().NumTemplateArgs; 939 } 940 941 /// \brief Retrieve the location of the right angle bracket following the 942 /// template arguments ('>'). 943 SourceLocation getRAngleLoc() const { 944 if (!hasExplicitTemplateArgs()) 945 return SourceLocation(); 946 947 return getExplicitTemplateArgs().RAngleLoc; 948 } 949 950 /// \brief Returns true if this expression refers to a function that 951 /// was resolved from an overloaded set having size greater than 1. 952 bool hadMultipleCandidates() const { 953 return DeclRefExprBits.HadMultipleCandidates; 954 } 955 /// \brief Sets the flag telling whether this expression refers to 956 /// a function that was resolved from an overloaded set having size 957 /// greater than 1. 958 void setHadMultipleCandidates(bool V = true) { 959 DeclRefExprBits.HadMultipleCandidates = V; 960 } 961 962 static bool classof(const Stmt *T) { 963 return T->getStmtClass() == DeclRefExprClass; 964 } 965 static bool classof(const DeclRefExpr *) { return true; } 966 967 // Iterators 968 child_range children() { return child_range(); } 969 970 friend class ASTStmtReader; 971 friend class ASTStmtWriter; 972}; 973 974/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 975class PredefinedExpr : public Expr { 976public: 977 enum IdentType { 978 Func, 979 Function, 980 PrettyFunction, 981 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 982 /// 'virtual' keyword is omitted for virtual member functions. 983 PrettyFunctionNoVirtual 984 }; 985 986private: 987 SourceLocation Loc; 988 IdentType Type; 989public: 990 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 991 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 992 type->isDependentType(), type->isDependentType(), 993 type->isInstantiationDependentType(), 994 /*ContainsUnexpandedParameterPack=*/false), 995 Loc(l), Type(IT) {} 996 997 /// \brief Construct an empty predefined expression. 998 explicit PredefinedExpr(EmptyShell Empty) 999 : Expr(PredefinedExprClass, Empty) { } 1000 1001 IdentType getIdentType() const { return Type; } 1002 void setIdentType(IdentType IT) { Type = IT; } 1003 1004 SourceLocation getLocation() const { return Loc; } 1005 void setLocation(SourceLocation L) { Loc = L; } 1006 1007 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1008 1009 SourceRange getSourceRange() const { return SourceRange(Loc); } 1010 1011 static bool classof(const Stmt *T) { 1012 return T->getStmtClass() == PredefinedExprClass; 1013 } 1014 static bool classof(const PredefinedExpr *) { return true; } 1015 1016 // Iterators 1017 child_range children() { return child_range(); } 1018}; 1019 1020/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1021/// leaking memory. 1022/// 1023/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1024/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1025/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1026/// the APFloat/APInt values will never get freed. APNumericStorage uses 1027/// ASTContext's allocator for memory allocation. 1028class APNumericStorage { 1029 unsigned BitWidth; 1030 union { 1031 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1032 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1033 }; 1034 1035 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1036 1037 APNumericStorage(const APNumericStorage&); // do not implement 1038 APNumericStorage& operator=(const APNumericStorage&); // do not implement 1039 1040protected: 1041 APNumericStorage() : BitWidth(0), VAL(0) { } 1042 1043 llvm::APInt getIntValue() const { 1044 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1045 if (NumWords > 1) 1046 return llvm::APInt(BitWidth, NumWords, pVal); 1047 else 1048 return llvm::APInt(BitWidth, VAL); 1049 } 1050 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1051}; 1052 1053class APIntStorage : public APNumericStorage { 1054public: 1055 llvm::APInt getValue() const { return getIntValue(); } 1056 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1057}; 1058 1059class APFloatStorage : public APNumericStorage { 1060public: 1061 llvm::APFloat getValue() const { return llvm::APFloat(getIntValue()); } 1062 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1063 setIntValue(C, Val.bitcastToAPInt()); 1064 } 1065}; 1066 1067class IntegerLiteral : public Expr { 1068 APIntStorage Num; 1069 SourceLocation Loc; 1070 1071 /// \brief Construct an empty integer literal. 1072 explicit IntegerLiteral(EmptyShell Empty) 1073 : Expr(IntegerLiteralClass, Empty) { } 1074 1075public: 1076 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1077 // or UnsignedLongLongTy 1078 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 1079 QualType type, SourceLocation l) 1080 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1081 false, false), 1082 Loc(l) { 1083 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 1084 assert(V.getBitWidth() == C.getIntWidth(type) && 1085 "Integer type is not the correct size for constant."); 1086 setValue(C, V); 1087 } 1088 1089 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1090 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1091 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1092 /// \param V - the value that the returned integer literal contains. 1093 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1094 QualType type, SourceLocation l); 1095 /// \brief Returns a new empty integer literal. 1096 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1097 1098 llvm::APInt getValue() const { return Num.getValue(); } 1099 SourceRange getSourceRange() const { return SourceRange(Loc); } 1100 1101 /// \brief Retrieve the location of the literal. 1102 SourceLocation getLocation() const { return Loc; } 1103 1104 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 1105 void setLocation(SourceLocation Location) { Loc = Location; } 1106 1107 static bool classof(const Stmt *T) { 1108 return T->getStmtClass() == IntegerLiteralClass; 1109 } 1110 static bool classof(const IntegerLiteral *) { return true; } 1111 1112 // Iterators 1113 child_range children() { return child_range(); } 1114}; 1115 1116class CharacterLiteral : public Expr { 1117public: 1118 enum CharacterKind { 1119 Ascii, 1120 Wide, 1121 UTF16, 1122 UTF32 1123 }; 1124 1125private: 1126 unsigned Value; 1127 SourceLocation Loc; 1128 unsigned Kind : 2; 1129public: 1130 // type should be IntTy 1131 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1132 SourceLocation l) 1133 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1134 false, false), 1135 Value(value), Loc(l), Kind(kind) { 1136 } 1137 1138 /// \brief Construct an empty character literal. 1139 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1140 1141 SourceLocation getLocation() const { return Loc; } 1142 CharacterKind getKind() const { return static_cast<CharacterKind>(Kind); } 1143 1144 SourceRange getSourceRange() const { return SourceRange(Loc); } 1145 1146 unsigned getValue() const { return Value; } 1147 1148 void setLocation(SourceLocation Location) { Loc = Location; } 1149 void setKind(CharacterKind kind) { Kind = kind; } 1150 void setValue(unsigned Val) { Value = Val; } 1151 1152 static bool classof(const Stmt *T) { 1153 return T->getStmtClass() == CharacterLiteralClass; 1154 } 1155 static bool classof(const CharacterLiteral *) { return true; } 1156 1157 // Iterators 1158 child_range children() { return child_range(); } 1159}; 1160 1161class FloatingLiteral : public Expr { 1162 APFloatStorage Num; 1163 bool IsExact : 1; 1164 SourceLocation Loc; 1165 1166 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1167 QualType Type, SourceLocation L) 1168 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1169 false, false), 1170 IsExact(isexact), Loc(L) { 1171 setValue(C, V); 1172 } 1173 1174 /// \brief Construct an empty floating-point literal. 1175 explicit FloatingLiteral(EmptyShell Empty) 1176 : Expr(FloatingLiteralClass, Empty), IsExact(false) { } 1177 1178public: 1179 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1180 bool isexact, QualType Type, SourceLocation L); 1181 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1182 1183 llvm::APFloat getValue() const { return Num.getValue(); } 1184 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1185 Num.setValue(C, Val); 1186 } 1187 1188 bool isExact() const { return IsExact; } 1189 void setExact(bool E) { IsExact = E; } 1190 1191 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1192 /// double. Note that this may cause loss of precision, but is useful for 1193 /// debugging dumps, etc. 1194 double getValueAsApproximateDouble() const; 1195 1196 SourceLocation getLocation() const { return Loc; } 1197 void setLocation(SourceLocation L) { Loc = L; } 1198 1199 SourceRange getSourceRange() const { return SourceRange(Loc); } 1200 1201 static bool classof(const Stmt *T) { 1202 return T->getStmtClass() == FloatingLiteralClass; 1203 } 1204 static bool classof(const FloatingLiteral *) { return true; } 1205 1206 // Iterators 1207 child_range children() { return child_range(); } 1208}; 1209 1210/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1211/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1212/// IntegerLiteral classes. Instances of this class always have a Complex type 1213/// whose element type matches the subexpression. 1214/// 1215class ImaginaryLiteral : public Expr { 1216 Stmt *Val; 1217public: 1218 ImaginaryLiteral(Expr *val, QualType Ty) 1219 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1220 false, false), 1221 Val(val) {} 1222 1223 /// \brief Build an empty imaginary literal. 1224 explicit ImaginaryLiteral(EmptyShell Empty) 1225 : Expr(ImaginaryLiteralClass, Empty) { } 1226 1227 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1228 Expr *getSubExpr() { return cast<Expr>(Val); } 1229 void setSubExpr(Expr *E) { Val = E; } 1230 1231 SourceRange getSourceRange() const { return Val->getSourceRange(); } 1232 static bool classof(const Stmt *T) { 1233 return T->getStmtClass() == ImaginaryLiteralClass; 1234 } 1235 static bool classof(const ImaginaryLiteral *) { return true; } 1236 1237 // Iterators 1238 child_range children() { return child_range(&Val, &Val+1); } 1239}; 1240 1241/// StringLiteral - This represents a string literal expression, e.g. "foo" 1242/// or L"bar" (wide strings). The actual string is returned by getStrData() 1243/// is NOT null-terminated, and the length of the string is determined by 1244/// calling getByteLength(). The C type for a string is always a 1245/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1246/// not. 1247/// 1248/// Note that strings in C can be formed by concatenation of multiple string 1249/// literal pptokens in translation phase #6. This keeps track of the locations 1250/// of each of these pieces. 1251/// 1252/// Strings in C can also be truncated and extended by assigning into arrays, 1253/// e.g. with constructs like: 1254/// char X[2] = "foobar"; 1255/// In this case, getByteLength() will return 6, but the string literal will 1256/// have type "char[2]". 1257class StringLiteral : public Expr { 1258public: 1259 enum StringKind { 1260 Ascii, 1261 Wide, 1262 UTF8, 1263 UTF16, 1264 UTF32 1265 }; 1266 1267private: 1268 friend class ASTStmtReader; 1269 1270 const char *StrData; 1271 unsigned ByteLength; 1272 unsigned NumConcatenated; 1273 unsigned Kind : 3; 1274 bool IsPascal : 1; 1275 SourceLocation TokLocs[1]; 1276 1277 StringLiteral(QualType Ty) : 1278 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1279 false) {} 1280 1281public: 1282 /// This is the "fully general" constructor that allows representation of 1283 /// strings formed from multiple concatenated tokens. 1284 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1285 bool Pascal, QualType Ty, 1286 const SourceLocation *Loc, unsigned NumStrs); 1287 1288 /// Simple constructor for string literals made from one token. 1289 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1290 bool Pascal, QualType Ty, 1291 SourceLocation Loc) { 1292 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1293 } 1294 1295 /// \brief Construct an empty string literal. 1296 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1297 1298 StringRef getString() const { 1299 return StringRef(StrData, ByteLength); 1300 } 1301 1302 unsigned getByteLength() const { return ByteLength; } 1303 1304 /// \brief Sets the string data to the given string data. 1305 void setString(ASTContext &C, StringRef Str); 1306 1307 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1308 bool isAscii() const { return Kind == Ascii; } 1309 bool isWide() const { return Kind == Wide; } 1310 bool isUTF8() const { return Kind == UTF8; } 1311 bool isUTF16() const { return Kind == UTF16; } 1312 bool isUTF32() const { return Kind == UTF32; } 1313 bool isPascal() const { return IsPascal; } 1314 1315 bool containsNonAsciiOrNull() const { 1316 StringRef Str = getString(); 1317 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1318 if (!isascii(Str[i]) || !Str[i]) 1319 return true; 1320 return false; 1321 } 1322 /// getNumConcatenated - Get the number of string literal tokens that were 1323 /// concatenated in translation phase #6 to form this string literal. 1324 unsigned getNumConcatenated() const { return NumConcatenated; } 1325 1326 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1327 assert(TokNum < NumConcatenated && "Invalid tok number"); 1328 return TokLocs[TokNum]; 1329 } 1330 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1331 assert(TokNum < NumConcatenated && "Invalid tok number"); 1332 TokLocs[TokNum] = L; 1333 } 1334 1335 /// getLocationOfByte - Return a source location that points to the specified 1336 /// byte of this string literal. 1337 /// 1338 /// Strings are amazingly complex. They can be formed from multiple tokens 1339 /// and can have escape sequences in them in addition to the usual trigraph 1340 /// and escaped newline business. This routine handles this complexity. 1341 /// 1342 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1343 const LangOptions &Features, 1344 const TargetInfo &Target) const; 1345 1346 typedef const SourceLocation *tokloc_iterator; 1347 tokloc_iterator tokloc_begin() const { return TokLocs; } 1348 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1349 1350 SourceRange getSourceRange() const { 1351 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1352 } 1353 static bool classof(const Stmt *T) { 1354 return T->getStmtClass() == StringLiteralClass; 1355 } 1356 static bool classof(const StringLiteral *) { return true; } 1357 1358 // Iterators 1359 child_range children() { return child_range(); } 1360}; 1361 1362/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1363/// AST node is only formed if full location information is requested. 1364class ParenExpr : public Expr { 1365 SourceLocation L, R; 1366 Stmt *Val; 1367public: 1368 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1369 : Expr(ParenExprClass, val->getType(), 1370 val->getValueKind(), val->getObjectKind(), 1371 val->isTypeDependent(), val->isValueDependent(), 1372 val->isInstantiationDependent(), 1373 val->containsUnexpandedParameterPack()), 1374 L(l), R(r), Val(val) {} 1375 1376 /// \brief Construct an empty parenthesized expression. 1377 explicit ParenExpr(EmptyShell Empty) 1378 : Expr(ParenExprClass, Empty) { } 1379 1380 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1381 Expr *getSubExpr() { return cast<Expr>(Val); } 1382 void setSubExpr(Expr *E) { Val = E; } 1383 1384 SourceRange getSourceRange() const { return SourceRange(L, R); } 1385 1386 /// \brief Get the location of the left parentheses '('. 1387 SourceLocation getLParen() const { return L; } 1388 void setLParen(SourceLocation Loc) { L = Loc; } 1389 1390 /// \brief Get the location of the right parentheses ')'. 1391 SourceLocation getRParen() const { return R; } 1392 void setRParen(SourceLocation Loc) { R = Loc; } 1393 1394 static bool classof(const Stmt *T) { 1395 return T->getStmtClass() == ParenExprClass; 1396 } 1397 static bool classof(const ParenExpr *) { return true; } 1398 1399 // Iterators 1400 child_range children() { return child_range(&Val, &Val+1); } 1401}; 1402 1403 1404/// UnaryOperator - This represents the unary-expression's (except sizeof and 1405/// alignof), the postinc/postdec operators from postfix-expression, and various 1406/// extensions. 1407/// 1408/// Notes on various nodes: 1409/// 1410/// Real/Imag - These return the real/imag part of a complex operand. If 1411/// applied to a non-complex value, the former returns its operand and the 1412/// later returns zero in the type of the operand. 1413/// 1414class UnaryOperator : public Expr { 1415public: 1416 typedef UnaryOperatorKind Opcode; 1417 1418private: 1419 unsigned Opc : 5; 1420 SourceLocation Loc; 1421 Stmt *Val; 1422public: 1423 1424 UnaryOperator(Expr *input, Opcode opc, QualType type, 1425 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1426 : Expr(UnaryOperatorClass, type, VK, OK, 1427 input->isTypeDependent() || type->isDependentType(), 1428 input->isValueDependent(), 1429 (input->isInstantiationDependent() || 1430 type->isInstantiationDependentType()), 1431 input->containsUnexpandedParameterPack()), 1432 Opc(opc), Loc(l), Val(input) {} 1433 1434 /// \brief Build an empty unary operator. 1435 explicit UnaryOperator(EmptyShell Empty) 1436 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1437 1438 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1439 void setOpcode(Opcode O) { Opc = O; } 1440 1441 Expr *getSubExpr() const { return cast<Expr>(Val); } 1442 void setSubExpr(Expr *E) { Val = E; } 1443 1444 /// getOperatorLoc - Return the location of the operator. 1445 SourceLocation getOperatorLoc() const { return Loc; } 1446 void setOperatorLoc(SourceLocation L) { Loc = L; } 1447 1448 /// isPostfix - Return true if this is a postfix operation, like x++. 1449 static bool isPostfix(Opcode Op) { 1450 return Op == UO_PostInc || Op == UO_PostDec; 1451 } 1452 1453 /// isPrefix - Return true if this is a prefix operation, like --x. 1454 static bool isPrefix(Opcode Op) { 1455 return Op == UO_PreInc || Op == UO_PreDec; 1456 } 1457 1458 bool isPrefix() const { return isPrefix(getOpcode()); } 1459 bool isPostfix() const { return isPostfix(getOpcode()); } 1460 1461 static bool isIncrementOp(Opcode Op) { 1462 return Op == UO_PreInc || Op == UO_PostInc; 1463 } 1464 bool isIncrementOp() const { 1465 return isIncrementOp(getOpcode()); 1466 } 1467 1468 static bool isDecrementOp(Opcode Op) { 1469 return Op == UO_PreDec || Op == UO_PostDec; 1470 } 1471 bool isDecrementOp() const { 1472 return isDecrementOp(getOpcode()); 1473 } 1474 1475 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1476 bool isIncrementDecrementOp() const { 1477 return isIncrementDecrementOp(getOpcode()); 1478 } 1479 1480 static bool isArithmeticOp(Opcode Op) { 1481 return Op >= UO_Plus && Op <= UO_LNot; 1482 } 1483 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1484 1485 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1486 /// corresponds to, e.g. "sizeof" or "[pre]++" 1487 static const char *getOpcodeStr(Opcode Op); 1488 1489 /// \brief Retrieve the unary opcode that corresponds to the given 1490 /// overloaded operator. 1491 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1492 1493 /// \brief Retrieve the overloaded operator kind that corresponds to 1494 /// the given unary opcode. 1495 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1496 1497 SourceRange getSourceRange() const { 1498 if (isPostfix()) 1499 return SourceRange(Val->getLocStart(), Loc); 1500 else 1501 return SourceRange(Loc, Val->getLocEnd()); 1502 } 1503 SourceLocation getExprLoc() const { return Loc; } 1504 1505 static bool classof(const Stmt *T) { 1506 return T->getStmtClass() == UnaryOperatorClass; 1507 } 1508 static bool classof(const UnaryOperator *) { return true; } 1509 1510 // Iterators 1511 child_range children() { return child_range(&Val, &Val+1); } 1512}; 1513 1514/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1515/// offsetof(record-type, member-designator). For example, given: 1516/// @code 1517/// struct S { 1518/// float f; 1519/// double d; 1520/// }; 1521/// struct T { 1522/// int i; 1523/// struct S s[10]; 1524/// }; 1525/// @endcode 1526/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1527 1528class OffsetOfExpr : public Expr { 1529public: 1530 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1531 class OffsetOfNode { 1532 public: 1533 /// \brief The kind of offsetof node we have. 1534 enum Kind { 1535 /// \brief An index into an array. 1536 Array = 0x00, 1537 /// \brief A field. 1538 Field = 0x01, 1539 /// \brief A field in a dependent type, known only by its name. 1540 Identifier = 0x02, 1541 /// \brief An implicit indirection through a C++ base class, when the 1542 /// field found is in a base class. 1543 Base = 0x03 1544 }; 1545 1546 private: 1547 enum { MaskBits = 2, Mask = 0x03 }; 1548 1549 /// \brief The source range that covers this part of the designator. 1550 SourceRange Range; 1551 1552 /// \brief The data describing the designator, which comes in three 1553 /// different forms, depending on the lower two bits. 1554 /// - An unsigned index into the array of Expr*'s stored after this node 1555 /// in memory, for [constant-expression] designators. 1556 /// - A FieldDecl*, for references to a known field. 1557 /// - An IdentifierInfo*, for references to a field with a given name 1558 /// when the class type is dependent. 1559 /// - A CXXBaseSpecifier*, for references that look at a field in a 1560 /// base class. 1561 uintptr_t Data; 1562 1563 public: 1564 /// \brief Create an offsetof node that refers to an array element. 1565 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1566 SourceLocation RBracketLoc) 1567 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1568 1569 /// \brief Create an offsetof node that refers to a field. 1570 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1571 SourceLocation NameLoc) 1572 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1573 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1574 1575 /// \brief Create an offsetof node that refers to an identifier. 1576 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1577 SourceLocation NameLoc) 1578 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1579 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1580 1581 /// \brief Create an offsetof node that refers into a C++ base class. 1582 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1583 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1584 1585 /// \brief Determine what kind of offsetof node this is. 1586 Kind getKind() const { 1587 return static_cast<Kind>(Data & Mask); 1588 } 1589 1590 /// \brief For an array element node, returns the index into the array 1591 /// of expressions. 1592 unsigned getArrayExprIndex() const { 1593 assert(getKind() == Array); 1594 return Data >> 2; 1595 } 1596 1597 /// \brief For a field offsetof node, returns the field. 1598 FieldDecl *getField() const { 1599 assert(getKind() == Field); 1600 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1601 } 1602 1603 /// \brief For a field or identifier offsetof node, returns the name of 1604 /// the field. 1605 IdentifierInfo *getFieldName() const; 1606 1607 /// \brief For a base class node, returns the base specifier. 1608 CXXBaseSpecifier *getBase() const { 1609 assert(getKind() == Base); 1610 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1611 } 1612 1613 /// \brief Retrieve the source range that covers this offsetof node. 1614 /// 1615 /// For an array element node, the source range contains the locations of 1616 /// the square brackets. For a field or identifier node, the source range 1617 /// contains the location of the period (if there is one) and the 1618 /// identifier. 1619 SourceRange getSourceRange() const { return Range; } 1620 }; 1621 1622private: 1623 1624 SourceLocation OperatorLoc, RParenLoc; 1625 // Base type; 1626 TypeSourceInfo *TSInfo; 1627 // Number of sub-components (i.e. instances of OffsetOfNode). 1628 unsigned NumComps; 1629 // Number of sub-expressions (i.e. array subscript expressions). 1630 unsigned NumExprs; 1631 1632 OffsetOfExpr(ASTContext &C, QualType type, 1633 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1634 OffsetOfNode* compsPtr, unsigned numComps, 1635 Expr** exprsPtr, unsigned numExprs, 1636 SourceLocation RParenLoc); 1637 1638 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1639 : Expr(OffsetOfExprClass, EmptyShell()), 1640 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1641 1642public: 1643 1644 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1645 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1646 OffsetOfNode* compsPtr, unsigned numComps, 1647 Expr** exprsPtr, unsigned numExprs, 1648 SourceLocation RParenLoc); 1649 1650 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1651 unsigned NumComps, unsigned NumExprs); 1652 1653 /// getOperatorLoc - Return the location of the operator. 1654 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1655 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1656 1657 /// \brief Return the location of the right parentheses. 1658 SourceLocation getRParenLoc() const { return RParenLoc; } 1659 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1660 1661 TypeSourceInfo *getTypeSourceInfo() const { 1662 return TSInfo; 1663 } 1664 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1665 TSInfo = tsi; 1666 } 1667 1668 const OffsetOfNode &getComponent(unsigned Idx) const { 1669 assert(Idx < NumComps && "Subscript out of range"); 1670 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1671 } 1672 1673 void setComponent(unsigned Idx, OffsetOfNode ON) { 1674 assert(Idx < NumComps && "Subscript out of range"); 1675 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1676 } 1677 1678 unsigned getNumComponents() const { 1679 return NumComps; 1680 } 1681 1682 Expr* getIndexExpr(unsigned Idx) { 1683 assert(Idx < NumExprs && "Subscript out of range"); 1684 return reinterpret_cast<Expr **>( 1685 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1686 } 1687 const Expr *getIndexExpr(unsigned Idx) const { 1688 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1689 } 1690 1691 void setIndexExpr(unsigned Idx, Expr* E) { 1692 assert(Idx < NumComps && "Subscript out of range"); 1693 reinterpret_cast<Expr **>( 1694 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1695 } 1696 1697 unsigned getNumExpressions() const { 1698 return NumExprs; 1699 } 1700 1701 SourceRange getSourceRange() const { 1702 return SourceRange(OperatorLoc, RParenLoc); 1703 } 1704 1705 static bool classof(const Stmt *T) { 1706 return T->getStmtClass() == OffsetOfExprClass; 1707 } 1708 1709 static bool classof(const OffsetOfExpr *) { return true; } 1710 1711 // Iterators 1712 child_range children() { 1713 Stmt **begin = 1714 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1715 + NumComps); 1716 return child_range(begin, begin + NumExprs); 1717 } 1718}; 1719 1720/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1721/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1722/// vec_step (OpenCL 1.1 6.11.12). 1723class UnaryExprOrTypeTraitExpr : public Expr { 1724 unsigned Kind : 2; 1725 bool isType : 1; // true if operand is a type, false if an expression 1726 union { 1727 TypeSourceInfo *Ty; 1728 Stmt *Ex; 1729 } Argument; 1730 SourceLocation OpLoc, RParenLoc; 1731 1732public: 1733 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1734 QualType resultType, SourceLocation op, 1735 SourceLocation rp) : 1736 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1737 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1738 // Value-dependent if the argument is type-dependent. 1739 TInfo->getType()->isDependentType(), 1740 TInfo->getType()->isInstantiationDependentType(), 1741 TInfo->getType()->containsUnexpandedParameterPack()), 1742 Kind(ExprKind), isType(true), OpLoc(op), RParenLoc(rp) { 1743 Argument.Ty = TInfo; 1744 } 1745 1746 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1747 QualType resultType, SourceLocation op, 1748 SourceLocation rp) : 1749 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1750 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1751 // Value-dependent if the argument is type-dependent. 1752 E->isTypeDependent(), 1753 E->isInstantiationDependent(), 1754 E->containsUnexpandedParameterPack()), 1755 Kind(ExprKind), isType(false), OpLoc(op), RParenLoc(rp) { 1756 Argument.Ex = E; 1757 } 1758 1759 /// \brief Construct an empty sizeof/alignof expression. 1760 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1761 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1762 1763 UnaryExprOrTypeTrait getKind() const { 1764 return static_cast<UnaryExprOrTypeTrait>(Kind); 1765 } 1766 void setKind(UnaryExprOrTypeTrait K) { Kind = K; } 1767 1768 bool isArgumentType() const { return isType; } 1769 QualType getArgumentType() const { 1770 return getArgumentTypeInfo()->getType(); 1771 } 1772 TypeSourceInfo *getArgumentTypeInfo() const { 1773 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1774 return Argument.Ty; 1775 } 1776 Expr *getArgumentExpr() { 1777 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1778 return static_cast<Expr*>(Argument.Ex); 1779 } 1780 const Expr *getArgumentExpr() const { 1781 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1782 } 1783 1784 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1785 void setArgument(TypeSourceInfo *TInfo) { 1786 Argument.Ty = TInfo; 1787 isType = true; 1788 } 1789 1790 /// Gets the argument type, or the type of the argument expression, whichever 1791 /// is appropriate. 1792 QualType getTypeOfArgument() const { 1793 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1794 } 1795 1796 SourceLocation getOperatorLoc() const { return OpLoc; } 1797 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1798 1799 SourceLocation getRParenLoc() const { return RParenLoc; } 1800 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1801 1802 SourceRange getSourceRange() const { 1803 return SourceRange(OpLoc, RParenLoc); 1804 } 1805 1806 static bool classof(const Stmt *T) { 1807 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1808 } 1809 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1810 1811 // Iterators 1812 child_range children(); 1813}; 1814 1815//===----------------------------------------------------------------------===// 1816// Postfix Operators. 1817//===----------------------------------------------------------------------===// 1818 1819/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1820class ArraySubscriptExpr : public Expr { 1821 enum { LHS, RHS, END_EXPR=2 }; 1822 Stmt* SubExprs[END_EXPR]; 1823 SourceLocation RBracketLoc; 1824public: 1825 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1826 ExprValueKind VK, ExprObjectKind OK, 1827 SourceLocation rbracketloc) 1828 : Expr(ArraySubscriptExprClass, t, VK, OK, 1829 lhs->isTypeDependent() || rhs->isTypeDependent(), 1830 lhs->isValueDependent() || rhs->isValueDependent(), 1831 (lhs->isInstantiationDependent() || 1832 rhs->isInstantiationDependent()), 1833 (lhs->containsUnexpandedParameterPack() || 1834 rhs->containsUnexpandedParameterPack())), 1835 RBracketLoc(rbracketloc) { 1836 SubExprs[LHS] = lhs; 1837 SubExprs[RHS] = rhs; 1838 } 1839 1840 /// \brief Create an empty array subscript expression. 1841 explicit ArraySubscriptExpr(EmptyShell Shell) 1842 : Expr(ArraySubscriptExprClass, Shell) { } 1843 1844 /// An array access can be written A[4] or 4[A] (both are equivalent). 1845 /// - getBase() and getIdx() always present the normalized view: A[4]. 1846 /// In this case getBase() returns "A" and getIdx() returns "4". 1847 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1848 /// 4[A] getLHS() returns "4". 1849 /// Note: Because vector element access is also written A[4] we must 1850 /// predicate the format conversion in getBase and getIdx only on the 1851 /// the type of the RHS, as it is possible for the LHS to be a vector of 1852 /// integer type 1853 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1854 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1855 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1856 1857 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1858 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1859 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1860 1861 Expr *getBase() { 1862 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1863 } 1864 1865 const Expr *getBase() const { 1866 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1867 } 1868 1869 Expr *getIdx() { 1870 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1871 } 1872 1873 const Expr *getIdx() const { 1874 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1875 } 1876 1877 SourceRange getSourceRange() const { 1878 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1879 } 1880 1881 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1882 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1883 1884 SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1885 1886 static bool classof(const Stmt *T) { 1887 return T->getStmtClass() == ArraySubscriptExprClass; 1888 } 1889 static bool classof(const ArraySubscriptExpr *) { return true; } 1890 1891 // Iterators 1892 child_range children() { 1893 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 1894 } 1895}; 1896 1897 1898/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1899/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1900/// while its subclasses may represent alternative syntax that (semantically) 1901/// results in a function call. For example, CXXOperatorCallExpr is 1902/// a subclass for overloaded operator calls that use operator syntax, e.g., 1903/// "str1 + str2" to resolve to a function call. 1904class CallExpr : public Expr { 1905 enum { FN=0, PREARGS_START=1 }; 1906 Stmt **SubExprs; 1907 unsigned NumArgs; 1908 SourceLocation RParenLoc; 1909 1910protected: 1911 // These versions of the constructor are for derived classes. 1912 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 1913 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 1914 SourceLocation rparenloc); 1915 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 1916 1917 Stmt *getPreArg(unsigned i) { 1918 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1919 return SubExprs[PREARGS_START+i]; 1920 } 1921 const Stmt *getPreArg(unsigned i) const { 1922 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1923 return SubExprs[PREARGS_START+i]; 1924 } 1925 void setPreArg(unsigned i, Stmt *PreArg) { 1926 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1927 SubExprs[PREARGS_START+i] = PreArg; 1928 } 1929 1930 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 1931 1932public: 1933 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1934 ExprValueKind VK, SourceLocation rparenloc); 1935 1936 /// \brief Build an empty call expression. 1937 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1938 1939 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1940 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1941 void setCallee(Expr *F) { SubExprs[FN] = F; } 1942 1943 Decl *getCalleeDecl(); 1944 const Decl *getCalleeDecl() const { 1945 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1946 } 1947 1948 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1949 FunctionDecl *getDirectCallee(); 1950 const FunctionDecl *getDirectCallee() const { 1951 return const_cast<CallExpr*>(this)->getDirectCallee(); 1952 } 1953 1954 /// getNumArgs - Return the number of actual arguments to this call. 1955 /// 1956 unsigned getNumArgs() const { return NumArgs; } 1957 1958 /// \brief Retrieve the call arguments. 1959 Expr **getArgs() { 1960 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 1961 } 1962 1963 /// getArg - Return the specified argument. 1964 Expr *getArg(unsigned Arg) { 1965 assert(Arg < NumArgs && "Arg access out of range!"); 1966 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1967 } 1968 const Expr *getArg(unsigned Arg) const { 1969 assert(Arg < NumArgs && "Arg access out of range!"); 1970 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1971 } 1972 1973 /// setArg - Set the specified argument. 1974 void setArg(unsigned Arg, Expr *ArgExpr) { 1975 assert(Arg < NumArgs && "Arg access out of range!"); 1976 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 1977 } 1978 1979 /// setNumArgs - This changes the number of arguments present in this call. 1980 /// Any orphaned expressions are deleted by this, and any new operands are set 1981 /// to null. 1982 void setNumArgs(ASTContext& C, unsigned NumArgs); 1983 1984 typedef ExprIterator arg_iterator; 1985 typedef ConstExprIterator const_arg_iterator; 1986 1987 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 1988 arg_iterator arg_end() { 1989 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1990 } 1991 const_arg_iterator arg_begin() const { 1992 return SubExprs+PREARGS_START+getNumPreArgs(); 1993 } 1994 const_arg_iterator arg_end() const { 1995 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1996 } 1997 1998 /// getNumCommas - Return the number of commas that must have been present in 1999 /// this function call. 2000 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2001 2002 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2003 /// not, return 0. 2004 unsigned isBuiltinCall(const ASTContext &Context) const; 2005 2006 /// getCallReturnType - Get the return type of the call expr. This is not 2007 /// always the type of the expr itself, if the return type is a reference 2008 /// type. 2009 QualType getCallReturnType() const; 2010 2011 SourceLocation getRParenLoc() const { return RParenLoc; } 2012 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2013 2014 SourceRange getSourceRange() const; 2015 2016 static bool classof(const Stmt *T) { 2017 return T->getStmtClass() >= firstCallExprConstant && 2018 T->getStmtClass() <= lastCallExprConstant; 2019 } 2020 static bool classof(const CallExpr *) { return true; } 2021 2022 // Iterators 2023 child_range children() { 2024 return child_range(&SubExprs[0], 2025 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2026 } 2027}; 2028 2029/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2030/// 2031class MemberExpr : public Expr { 2032 /// Extra data stored in some member expressions. 2033 struct MemberNameQualifier { 2034 /// \brief The nested-name-specifier that qualifies the name, including 2035 /// source-location information. 2036 NestedNameSpecifierLoc QualifierLoc; 2037 2038 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2039 /// name qualifiers. 2040 DeclAccessPair FoundDecl; 2041 }; 2042 2043 /// Base - the expression for the base pointer or structure references. In 2044 /// X.F, this is "X". 2045 Stmt *Base; 2046 2047 /// MemberDecl - This is the decl being referenced by the field/member name. 2048 /// In X.F, this is the decl referenced by F. 2049 ValueDecl *MemberDecl; 2050 2051 /// MemberLoc - This is the location of the member name. 2052 SourceLocation MemberLoc; 2053 2054 /// MemberDNLoc - Provides source/type location info for the 2055 /// declaration name embedded in MemberDecl. 2056 DeclarationNameLoc MemberDNLoc; 2057 2058 /// IsArrow - True if this is "X->F", false if this is "X.F". 2059 bool IsArrow : 1; 2060 2061 /// \brief True if this member expression used a nested-name-specifier to 2062 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2063 /// declaration. When true, a MemberNameQualifier 2064 /// structure is allocated immediately after the MemberExpr. 2065 bool HasQualifierOrFoundDecl : 1; 2066 2067 /// \brief True if this member expression specified a template argument list 2068 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 2069 /// structure (and its TemplateArguments) are allocated immediately after 2070 /// the MemberExpr or, if the member expression also has a qualifier, after 2071 /// the MemberNameQualifier structure. 2072 bool HasExplicitTemplateArgumentList : 1; 2073 2074 /// \brief True if this member expression refers to a method that 2075 /// was resolved from an overloaded set having size greater than 1. 2076 bool HadMultipleCandidates : 1; 2077 2078 /// \brief Retrieve the qualifier that preceded the member name, if any. 2079 MemberNameQualifier *getMemberQualifier() { 2080 assert(HasQualifierOrFoundDecl); 2081 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2082 } 2083 2084 /// \brief Retrieve the qualifier that preceded the member name, if any. 2085 const MemberNameQualifier *getMemberQualifier() const { 2086 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2087 } 2088 2089public: 2090 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2091 const DeclarationNameInfo &NameInfo, QualType ty, 2092 ExprValueKind VK, ExprObjectKind OK) 2093 : Expr(MemberExprClass, ty, VK, OK, 2094 base->isTypeDependent(), 2095 base->isValueDependent(), 2096 base->isInstantiationDependent(), 2097 base->containsUnexpandedParameterPack()), 2098 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 2099 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 2100 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false), 2101 HadMultipleCandidates(false) { 2102 assert(memberdecl->getDeclName() == NameInfo.getName()); 2103 } 2104 2105 // NOTE: this constructor should be used only when it is known that 2106 // the member name can not provide additional syntactic info 2107 // (i.e., source locations for C++ operator names or type source info 2108 // for constructors, destructors and conversion oeprators). 2109 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2110 SourceLocation l, QualType ty, 2111 ExprValueKind VK, ExprObjectKind OK) 2112 : Expr(MemberExprClass, ty, VK, OK, 2113 base->isTypeDependent(), base->isValueDependent(), 2114 base->isInstantiationDependent(), 2115 base->containsUnexpandedParameterPack()), 2116 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 2117 IsArrow(isarrow), 2118 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false), 2119 HadMultipleCandidates(false) {} 2120 2121 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2122 NestedNameSpecifierLoc QualifierLoc, 2123 ValueDecl *memberdecl, DeclAccessPair founddecl, 2124 DeclarationNameInfo MemberNameInfo, 2125 const TemplateArgumentListInfo *targs, 2126 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2127 2128 void setBase(Expr *E) { Base = E; } 2129 Expr *getBase() const { return cast<Expr>(Base); } 2130 2131 /// \brief Retrieve the member declaration to which this expression refers. 2132 /// 2133 /// The returned declaration will either be a FieldDecl or (in C++) 2134 /// a CXXMethodDecl. 2135 ValueDecl *getMemberDecl() const { return MemberDecl; } 2136 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2137 2138 /// \brief Retrieves the declaration found by lookup. 2139 DeclAccessPair getFoundDecl() const { 2140 if (!HasQualifierOrFoundDecl) 2141 return DeclAccessPair::make(getMemberDecl(), 2142 getMemberDecl()->getAccess()); 2143 return getMemberQualifier()->FoundDecl; 2144 } 2145 2146 /// \brief Determines whether this member expression actually had 2147 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2148 /// x->Base::foo. 2149 bool hasQualifier() const { return getQualifier() != 0; } 2150 2151 /// \brief If the member name was qualified, retrieves the 2152 /// nested-name-specifier that precedes the member name. Otherwise, returns 2153 /// NULL. 2154 NestedNameSpecifier *getQualifier() const { 2155 if (!HasQualifierOrFoundDecl) 2156 return 0; 2157 2158 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2159 } 2160 2161 /// \brief If the member name was qualified, retrieves the 2162 /// nested-name-specifier that precedes the member name, with source-location 2163 /// information. 2164 NestedNameSpecifierLoc getQualifierLoc() const { 2165 if (!hasQualifier()) 2166 return NestedNameSpecifierLoc(); 2167 2168 return getMemberQualifier()->QualifierLoc; 2169 } 2170 2171 /// \brief Determines whether this member expression actually had a C++ 2172 /// template argument list explicitly specified, e.g., x.f<int>. 2173 bool hasExplicitTemplateArgs() const { 2174 return HasExplicitTemplateArgumentList; 2175 } 2176 2177 /// \brief Copies the template arguments (if present) into the given 2178 /// structure. 2179 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2180 if (hasExplicitTemplateArgs()) 2181 getExplicitTemplateArgs().copyInto(List); 2182 } 2183 2184 /// \brief Retrieve the explicit template argument list that 2185 /// follow the member template name. This must only be called on an 2186 /// expression with explicit template arguments. 2187 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2188 assert(HasExplicitTemplateArgumentList); 2189 if (!HasQualifierOrFoundDecl) 2190 return *reinterpret_cast<ASTTemplateArgumentListInfo *>(this + 1); 2191 2192 return *reinterpret_cast<ASTTemplateArgumentListInfo *>( 2193 getMemberQualifier() + 1); 2194 } 2195 2196 /// \brief Retrieve the explicit template argument list that 2197 /// followed the member template name. This must only be called on 2198 /// an expression with explicit template arguments. 2199 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2200 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2201 } 2202 2203 /// \brief Retrieves the optional explicit template arguments. 2204 /// This points to the same data as getExplicitTemplateArgs(), but 2205 /// returns null if there are no explicit template arguments. 2206 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2207 if (!hasExplicitTemplateArgs()) return 0; 2208 return &getExplicitTemplateArgs(); 2209 } 2210 2211 /// \brief Retrieve the location of the left angle bracket following the 2212 /// member name ('<'), if any. 2213 SourceLocation getLAngleLoc() const { 2214 if (!HasExplicitTemplateArgumentList) 2215 return SourceLocation(); 2216 2217 return getExplicitTemplateArgs().LAngleLoc; 2218 } 2219 2220 /// \brief Retrieve the template arguments provided as part of this 2221 /// template-id. 2222 const TemplateArgumentLoc *getTemplateArgs() const { 2223 if (!HasExplicitTemplateArgumentList) 2224 return 0; 2225 2226 return getExplicitTemplateArgs().getTemplateArgs(); 2227 } 2228 2229 /// \brief Retrieve the number of template arguments provided as part of this 2230 /// template-id. 2231 unsigned getNumTemplateArgs() const { 2232 if (!HasExplicitTemplateArgumentList) 2233 return 0; 2234 2235 return getExplicitTemplateArgs().NumTemplateArgs; 2236 } 2237 2238 /// \brief Retrieve the location of the right angle bracket following the 2239 /// template arguments ('>'). 2240 SourceLocation getRAngleLoc() const { 2241 if (!HasExplicitTemplateArgumentList) 2242 return SourceLocation(); 2243 2244 return getExplicitTemplateArgs().RAngleLoc; 2245 } 2246 2247 /// \brief Retrieve the member declaration name info. 2248 DeclarationNameInfo getMemberNameInfo() const { 2249 return DeclarationNameInfo(MemberDecl->getDeclName(), 2250 MemberLoc, MemberDNLoc); 2251 } 2252 2253 bool isArrow() const { return IsArrow; } 2254 void setArrow(bool A) { IsArrow = A; } 2255 2256 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2257 /// location of 'F'. 2258 SourceLocation getMemberLoc() const { return MemberLoc; } 2259 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2260 2261 SourceRange getSourceRange() const; 2262 2263 SourceLocation getExprLoc() const { return MemberLoc; } 2264 2265 /// \brief Determine whether the base of this explicit is implicit. 2266 bool isImplicitAccess() const { 2267 return getBase() && getBase()->isImplicitCXXThis(); 2268 } 2269 2270 /// \brief Returns true if this member expression refers to a method that 2271 /// was resolved from an overloaded set having size greater than 1. 2272 bool hadMultipleCandidates() const { 2273 return HadMultipleCandidates; 2274 } 2275 /// \brief Sets the flag telling whether this expression refers to 2276 /// a method that was resolved from an overloaded set having size 2277 /// greater than 1. 2278 void setHadMultipleCandidates(bool V = true) { 2279 HadMultipleCandidates = V; 2280 } 2281 2282 static bool classof(const Stmt *T) { 2283 return T->getStmtClass() == MemberExprClass; 2284 } 2285 static bool classof(const MemberExpr *) { return true; } 2286 2287 // Iterators 2288 child_range children() { return child_range(&Base, &Base+1); } 2289 2290 friend class ASTReader; 2291 friend class ASTStmtWriter; 2292}; 2293 2294/// CompoundLiteralExpr - [C99 6.5.2.5] 2295/// 2296class CompoundLiteralExpr : public Expr { 2297 /// LParenLoc - If non-null, this is the location of the left paren in a 2298 /// compound literal like "(int){4}". This can be null if this is a 2299 /// synthesized compound expression. 2300 SourceLocation LParenLoc; 2301 2302 /// The type as written. This can be an incomplete array type, in 2303 /// which case the actual expression type will be different. 2304 TypeSourceInfo *TInfo; 2305 Stmt *Init; 2306 bool FileScope; 2307public: 2308 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2309 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2310 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2311 tinfo->getType()->isDependentType(), 2312 init->isValueDependent(), 2313 (init->isInstantiationDependent() || 2314 tinfo->getType()->isInstantiationDependentType()), 2315 init->containsUnexpandedParameterPack()), 2316 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2317 2318 /// \brief Construct an empty compound literal. 2319 explicit CompoundLiteralExpr(EmptyShell Empty) 2320 : Expr(CompoundLiteralExprClass, Empty) { } 2321 2322 const Expr *getInitializer() const { return cast<Expr>(Init); } 2323 Expr *getInitializer() { return cast<Expr>(Init); } 2324 void setInitializer(Expr *E) { Init = E; } 2325 2326 bool isFileScope() const { return FileScope; } 2327 void setFileScope(bool FS) { FileScope = FS; } 2328 2329 SourceLocation getLParenLoc() const { return LParenLoc; } 2330 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2331 2332 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2333 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2334 2335 SourceRange getSourceRange() const { 2336 // FIXME: Init should never be null. 2337 if (!Init) 2338 return SourceRange(); 2339 if (LParenLoc.isInvalid()) 2340 return Init->getSourceRange(); 2341 return SourceRange(LParenLoc, Init->getLocEnd()); 2342 } 2343 2344 static bool classof(const Stmt *T) { 2345 return T->getStmtClass() == CompoundLiteralExprClass; 2346 } 2347 static bool classof(const CompoundLiteralExpr *) { return true; } 2348 2349 // Iterators 2350 child_range children() { return child_range(&Init, &Init+1); } 2351}; 2352 2353/// CastExpr - Base class for type casts, including both implicit 2354/// casts (ImplicitCastExpr) and explicit casts that have some 2355/// representation in the source code (ExplicitCastExpr's derived 2356/// classes). 2357class CastExpr : public Expr { 2358public: 2359 typedef clang::CastKind CastKind; 2360 2361private: 2362 Stmt *Op; 2363 2364 void CheckCastConsistency() const; 2365 2366 const CXXBaseSpecifier * const *path_buffer() const { 2367 return const_cast<CastExpr*>(this)->path_buffer(); 2368 } 2369 CXXBaseSpecifier **path_buffer(); 2370 2371 void setBasePathSize(unsigned basePathSize) { 2372 CastExprBits.BasePathSize = basePathSize; 2373 assert(CastExprBits.BasePathSize == basePathSize && 2374 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2375 } 2376 2377protected: 2378 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2379 const CastKind kind, Expr *op, unsigned BasePathSize) : 2380 Expr(SC, ty, VK, OK_Ordinary, 2381 // Cast expressions are type-dependent if the type is 2382 // dependent (C++ [temp.dep.expr]p3). 2383 ty->isDependentType(), 2384 // Cast expressions are value-dependent if the type is 2385 // dependent or if the subexpression is value-dependent. 2386 ty->isDependentType() || (op && op->isValueDependent()), 2387 (ty->isInstantiationDependentType() || 2388 (op && op->isInstantiationDependent())), 2389 (ty->containsUnexpandedParameterPack() || 2390 op->containsUnexpandedParameterPack())), 2391 Op(op) { 2392 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2393 CastExprBits.Kind = kind; 2394 setBasePathSize(BasePathSize); 2395#ifndef NDEBUG 2396 CheckCastConsistency(); 2397#endif 2398 } 2399 2400 /// \brief Construct an empty cast. 2401 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2402 : Expr(SC, Empty) { 2403 setBasePathSize(BasePathSize); 2404 } 2405 2406public: 2407 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2408 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2409 const char *getCastKindName() const; 2410 2411 Expr *getSubExpr() { return cast<Expr>(Op); } 2412 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2413 void setSubExpr(Expr *E) { Op = E; } 2414 2415 /// \brief Retrieve the cast subexpression as it was written in the source 2416 /// code, looking through any implicit casts or other intermediate nodes 2417 /// introduced by semantic analysis. 2418 Expr *getSubExprAsWritten(); 2419 const Expr *getSubExprAsWritten() const { 2420 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2421 } 2422 2423 typedef CXXBaseSpecifier **path_iterator; 2424 typedef const CXXBaseSpecifier * const *path_const_iterator; 2425 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2426 unsigned path_size() const { return CastExprBits.BasePathSize; } 2427 path_iterator path_begin() { return path_buffer(); } 2428 path_iterator path_end() { return path_buffer() + path_size(); } 2429 path_const_iterator path_begin() const { return path_buffer(); } 2430 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2431 2432 void setCastPath(const CXXCastPath &Path); 2433 2434 static bool classof(const Stmt *T) { 2435 return T->getStmtClass() >= firstCastExprConstant && 2436 T->getStmtClass() <= lastCastExprConstant; 2437 } 2438 static bool classof(const CastExpr *) { return true; } 2439 2440 // Iterators 2441 child_range children() { return child_range(&Op, &Op+1); } 2442}; 2443 2444/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2445/// conversions, which have no direct representation in the original 2446/// source code. For example: converting T[]->T*, void f()->void 2447/// (*f)(), float->double, short->int, etc. 2448/// 2449/// In C, implicit casts always produce rvalues. However, in C++, an 2450/// implicit cast whose result is being bound to a reference will be 2451/// an lvalue or xvalue. For example: 2452/// 2453/// @code 2454/// class Base { }; 2455/// class Derived : public Base { }; 2456/// Derived &&ref(); 2457/// void f(Derived d) { 2458/// Base& b = d; // initializer is an ImplicitCastExpr 2459/// // to an lvalue of type Base 2460/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2461/// // to an xvalue of type Base 2462/// } 2463/// @endcode 2464class ImplicitCastExpr : public CastExpr { 2465private: 2466 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2467 unsigned BasePathLength, ExprValueKind VK) 2468 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2469 } 2470 2471 /// \brief Construct an empty implicit cast. 2472 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2473 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2474 2475public: 2476 enum OnStack_t { OnStack }; 2477 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2478 ExprValueKind VK) 2479 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2480 } 2481 2482 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2483 CastKind Kind, Expr *Operand, 2484 const CXXCastPath *BasePath, 2485 ExprValueKind Cat); 2486 2487 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2488 2489 SourceRange getSourceRange() const { 2490 return getSubExpr()->getSourceRange(); 2491 } 2492 2493 static bool classof(const Stmt *T) { 2494 return T->getStmtClass() == ImplicitCastExprClass; 2495 } 2496 static bool classof(const ImplicitCastExpr *) { return true; } 2497}; 2498 2499inline Expr *Expr::IgnoreImpCasts() { 2500 Expr *e = this; 2501 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2502 e = ice->getSubExpr(); 2503 return e; 2504} 2505 2506/// ExplicitCastExpr - An explicit cast written in the source 2507/// code. 2508/// 2509/// This class is effectively an abstract class, because it provides 2510/// the basic representation of an explicitly-written cast without 2511/// specifying which kind of cast (C cast, functional cast, static 2512/// cast, etc.) was written; specific derived classes represent the 2513/// particular style of cast and its location information. 2514/// 2515/// Unlike implicit casts, explicit cast nodes have two different 2516/// types: the type that was written into the source code, and the 2517/// actual type of the expression as determined by semantic 2518/// analysis. These types may differ slightly. For example, in C++ one 2519/// can cast to a reference type, which indicates that the resulting 2520/// expression will be an lvalue or xvalue. The reference type, however, 2521/// will not be used as the type of the expression. 2522class ExplicitCastExpr : public CastExpr { 2523 /// TInfo - Source type info for the (written) type 2524 /// this expression is casting to. 2525 TypeSourceInfo *TInfo; 2526 2527protected: 2528 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2529 CastKind kind, Expr *op, unsigned PathSize, 2530 TypeSourceInfo *writtenTy) 2531 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2532 2533 /// \brief Construct an empty explicit cast. 2534 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2535 : CastExpr(SC, Shell, PathSize) { } 2536 2537public: 2538 /// getTypeInfoAsWritten - Returns the type source info for the type 2539 /// that this expression is casting to. 2540 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2541 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2542 2543 /// getTypeAsWritten - Returns the type that this expression is 2544 /// casting to, as written in the source code. 2545 QualType getTypeAsWritten() const { return TInfo->getType(); } 2546 2547 static bool classof(const Stmt *T) { 2548 return T->getStmtClass() >= firstExplicitCastExprConstant && 2549 T->getStmtClass() <= lastExplicitCastExprConstant; 2550 } 2551 static bool classof(const ExplicitCastExpr *) { return true; } 2552}; 2553 2554/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2555/// cast in C++ (C++ [expr.cast]), which uses the syntax 2556/// (Type)expr. For example: @c (int)f. 2557class CStyleCastExpr : public ExplicitCastExpr { 2558 SourceLocation LPLoc; // the location of the left paren 2559 SourceLocation RPLoc; // the location of the right paren 2560 2561 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2562 unsigned PathSize, TypeSourceInfo *writtenTy, 2563 SourceLocation l, SourceLocation r) 2564 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2565 writtenTy), LPLoc(l), RPLoc(r) {} 2566 2567 /// \brief Construct an empty C-style explicit cast. 2568 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2569 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2570 2571public: 2572 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2573 ExprValueKind VK, CastKind K, 2574 Expr *Op, const CXXCastPath *BasePath, 2575 TypeSourceInfo *WrittenTy, SourceLocation L, 2576 SourceLocation R); 2577 2578 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2579 2580 SourceLocation getLParenLoc() const { return LPLoc; } 2581 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2582 2583 SourceLocation getRParenLoc() const { return RPLoc; } 2584 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2585 2586 SourceRange getSourceRange() const { 2587 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2588 } 2589 static bool classof(const Stmt *T) { 2590 return T->getStmtClass() == CStyleCastExprClass; 2591 } 2592 static bool classof(const CStyleCastExpr *) { return true; } 2593}; 2594 2595/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2596/// 2597/// This expression node kind describes a builtin binary operation, 2598/// such as "x + y" for integer values "x" and "y". The operands will 2599/// already have been converted to appropriate types (e.g., by 2600/// performing promotions or conversions). 2601/// 2602/// In C++, where operators may be overloaded, a different kind of 2603/// expression node (CXXOperatorCallExpr) is used to express the 2604/// invocation of an overloaded operator with operator syntax. Within 2605/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2606/// used to store an expression "x + y" depends on the subexpressions 2607/// for x and y. If neither x or y is type-dependent, and the "+" 2608/// operator resolves to a built-in operation, BinaryOperator will be 2609/// used to express the computation (x and y may still be 2610/// value-dependent). If either x or y is type-dependent, or if the 2611/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2612/// be used to express the computation. 2613class BinaryOperator : public Expr { 2614public: 2615 typedef BinaryOperatorKind Opcode; 2616 2617private: 2618 unsigned Opc : 6; 2619 SourceLocation OpLoc; 2620 2621 enum { LHS, RHS, END_EXPR }; 2622 Stmt* SubExprs[END_EXPR]; 2623public: 2624 2625 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2626 ExprValueKind VK, ExprObjectKind OK, 2627 SourceLocation opLoc) 2628 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2629 lhs->isTypeDependent() || rhs->isTypeDependent(), 2630 lhs->isValueDependent() || rhs->isValueDependent(), 2631 (lhs->isInstantiationDependent() || 2632 rhs->isInstantiationDependent()), 2633 (lhs->containsUnexpandedParameterPack() || 2634 rhs->containsUnexpandedParameterPack())), 2635 Opc(opc), OpLoc(opLoc) { 2636 SubExprs[LHS] = lhs; 2637 SubExprs[RHS] = rhs; 2638 assert(!isCompoundAssignmentOp() && 2639 "Use ArithAssignBinaryOperator for compound assignments"); 2640 } 2641 2642 /// \brief Construct an empty binary operator. 2643 explicit BinaryOperator(EmptyShell Empty) 2644 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2645 2646 SourceLocation getOperatorLoc() const { return OpLoc; } 2647 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2648 2649 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2650 void setOpcode(Opcode O) { Opc = O; } 2651 2652 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2653 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2654 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2655 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2656 2657 SourceRange getSourceRange() const { 2658 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2659 } 2660 2661 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2662 /// corresponds to, e.g. "<<=". 2663 static const char *getOpcodeStr(Opcode Op); 2664 2665 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2666 2667 /// \brief Retrieve the binary opcode that corresponds to the given 2668 /// overloaded operator. 2669 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2670 2671 /// \brief Retrieve the overloaded operator kind that corresponds to 2672 /// the given binary opcode. 2673 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2674 2675 /// predicates to categorize the respective opcodes. 2676 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2677 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2678 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2679 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2680 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2681 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2682 2683 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2684 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2685 2686 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2687 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2688 2689 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2690 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2691 2692 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2693 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2694 2695 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2696 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2697 2698 static bool isAssignmentOp(Opcode Opc) { 2699 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2700 } 2701 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2702 2703 static bool isCompoundAssignmentOp(Opcode Opc) { 2704 return Opc > BO_Assign && Opc <= BO_OrAssign; 2705 } 2706 bool isCompoundAssignmentOp() const { 2707 return isCompoundAssignmentOp(getOpcode()); 2708 } 2709 2710 static bool isShiftAssignOp(Opcode Opc) { 2711 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2712 } 2713 bool isShiftAssignOp() const { 2714 return isShiftAssignOp(getOpcode()); 2715 } 2716 2717 static bool classof(const Stmt *S) { 2718 return S->getStmtClass() >= firstBinaryOperatorConstant && 2719 S->getStmtClass() <= lastBinaryOperatorConstant; 2720 } 2721 static bool classof(const BinaryOperator *) { return true; } 2722 2723 // Iterators 2724 child_range children() { 2725 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2726 } 2727 2728protected: 2729 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2730 ExprValueKind VK, ExprObjectKind OK, 2731 SourceLocation opLoc, bool dead) 2732 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2733 lhs->isTypeDependent() || rhs->isTypeDependent(), 2734 lhs->isValueDependent() || rhs->isValueDependent(), 2735 (lhs->isInstantiationDependent() || 2736 rhs->isInstantiationDependent()), 2737 (lhs->containsUnexpandedParameterPack() || 2738 rhs->containsUnexpandedParameterPack())), 2739 Opc(opc), OpLoc(opLoc) { 2740 SubExprs[LHS] = lhs; 2741 SubExprs[RHS] = rhs; 2742 } 2743 2744 BinaryOperator(StmtClass SC, EmptyShell Empty) 2745 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2746}; 2747 2748/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2749/// track of the type the operation is performed in. Due to the semantics of 2750/// these operators, the operands are promoted, the arithmetic performed, an 2751/// implicit conversion back to the result type done, then the assignment takes 2752/// place. This captures the intermediate type which the computation is done 2753/// in. 2754class CompoundAssignOperator : public BinaryOperator { 2755 QualType ComputationLHSType; 2756 QualType ComputationResultType; 2757public: 2758 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2759 ExprValueKind VK, ExprObjectKind OK, 2760 QualType CompLHSType, QualType CompResultType, 2761 SourceLocation OpLoc) 2762 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2763 ComputationLHSType(CompLHSType), 2764 ComputationResultType(CompResultType) { 2765 assert(isCompoundAssignmentOp() && 2766 "Only should be used for compound assignments"); 2767 } 2768 2769 /// \brief Build an empty compound assignment operator expression. 2770 explicit CompoundAssignOperator(EmptyShell Empty) 2771 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2772 2773 // The two computation types are the type the LHS is converted 2774 // to for the computation and the type of the result; the two are 2775 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2776 QualType getComputationLHSType() const { return ComputationLHSType; } 2777 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2778 2779 QualType getComputationResultType() const { return ComputationResultType; } 2780 void setComputationResultType(QualType T) { ComputationResultType = T; } 2781 2782 static bool classof(const CompoundAssignOperator *) { return true; } 2783 static bool classof(const Stmt *S) { 2784 return S->getStmtClass() == CompoundAssignOperatorClass; 2785 } 2786}; 2787 2788/// AbstractConditionalOperator - An abstract base class for 2789/// ConditionalOperator and BinaryConditionalOperator. 2790class AbstractConditionalOperator : public Expr { 2791 SourceLocation QuestionLoc, ColonLoc; 2792 friend class ASTStmtReader; 2793 2794protected: 2795 AbstractConditionalOperator(StmtClass SC, QualType T, 2796 ExprValueKind VK, ExprObjectKind OK, 2797 bool TD, bool VD, bool ID, 2798 bool ContainsUnexpandedParameterPack, 2799 SourceLocation qloc, 2800 SourceLocation cloc) 2801 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 2802 QuestionLoc(qloc), ColonLoc(cloc) {} 2803 2804 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2805 : Expr(SC, Empty) { } 2806 2807public: 2808 // getCond - Return the expression representing the condition for 2809 // the ?: operator. 2810 Expr *getCond() const; 2811 2812 // getTrueExpr - Return the subexpression representing the value of 2813 // the expression if the condition evaluates to true. 2814 Expr *getTrueExpr() const; 2815 2816 // getFalseExpr - Return the subexpression representing the value of 2817 // the expression if the condition evaluates to false. This is 2818 // the same as getRHS. 2819 Expr *getFalseExpr() const; 2820 2821 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2822 SourceLocation getColonLoc() const { return ColonLoc; } 2823 2824 static bool classof(const Stmt *T) { 2825 return T->getStmtClass() == ConditionalOperatorClass || 2826 T->getStmtClass() == BinaryConditionalOperatorClass; 2827 } 2828 static bool classof(const AbstractConditionalOperator *) { return true; } 2829}; 2830 2831/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2832/// middle" extension is a BinaryConditionalOperator. 2833class ConditionalOperator : public AbstractConditionalOperator { 2834 enum { COND, LHS, RHS, END_EXPR }; 2835 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2836 2837 friend class ASTStmtReader; 2838public: 2839 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2840 SourceLocation CLoc, Expr *rhs, 2841 QualType t, ExprValueKind VK, ExprObjectKind OK) 2842 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 2843 // FIXME: the type of the conditional operator doesn't 2844 // depend on the type of the conditional, but the standard 2845 // seems to imply that it could. File a bug! 2846 (lhs->isTypeDependent() || rhs->isTypeDependent()), 2847 (cond->isValueDependent() || lhs->isValueDependent() || 2848 rhs->isValueDependent()), 2849 (cond->isInstantiationDependent() || 2850 lhs->isInstantiationDependent() || 2851 rhs->isInstantiationDependent()), 2852 (cond->containsUnexpandedParameterPack() || 2853 lhs->containsUnexpandedParameterPack() || 2854 rhs->containsUnexpandedParameterPack()), 2855 QLoc, CLoc) { 2856 SubExprs[COND] = cond; 2857 SubExprs[LHS] = lhs; 2858 SubExprs[RHS] = rhs; 2859 } 2860 2861 /// \brief Build an empty conditional operator. 2862 explicit ConditionalOperator(EmptyShell Empty) 2863 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 2864 2865 // getCond - Return the expression representing the condition for 2866 // the ?: operator. 2867 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2868 2869 // getTrueExpr - Return the subexpression representing the value of 2870 // the expression if the condition evaluates to true. 2871 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 2872 2873 // getFalseExpr - Return the subexpression representing the value of 2874 // the expression if the condition evaluates to false. This is 2875 // the same as getRHS. 2876 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2877 2878 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2879 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2880 2881 SourceRange getSourceRange() const { 2882 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2883 } 2884 static bool classof(const Stmt *T) { 2885 return T->getStmtClass() == ConditionalOperatorClass; 2886 } 2887 static bool classof(const ConditionalOperator *) { return true; } 2888 2889 // Iterators 2890 child_range children() { 2891 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2892 } 2893}; 2894 2895/// BinaryConditionalOperator - The GNU extension to the conditional 2896/// operator which allows the middle operand to be omitted. 2897/// 2898/// This is a different expression kind on the assumption that almost 2899/// every client ends up needing to know that these are different. 2900class BinaryConditionalOperator : public AbstractConditionalOperator { 2901 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 2902 2903 /// - the common condition/left-hand-side expression, which will be 2904 /// evaluated as the opaque value 2905 /// - the condition, expressed in terms of the opaque value 2906 /// - the left-hand-side, expressed in terms of the opaque value 2907 /// - the right-hand-side 2908 Stmt *SubExprs[NUM_SUBEXPRS]; 2909 OpaqueValueExpr *OpaqueValue; 2910 2911 friend class ASTStmtReader; 2912public: 2913 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 2914 Expr *cond, Expr *lhs, Expr *rhs, 2915 SourceLocation qloc, SourceLocation cloc, 2916 QualType t, ExprValueKind VK, ExprObjectKind OK) 2917 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 2918 (common->isTypeDependent() || rhs->isTypeDependent()), 2919 (common->isValueDependent() || rhs->isValueDependent()), 2920 (common->isInstantiationDependent() || 2921 rhs->isInstantiationDependent()), 2922 (common->containsUnexpandedParameterPack() || 2923 rhs->containsUnexpandedParameterPack()), 2924 qloc, cloc), 2925 OpaqueValue(opaqueValue) { 2926 SubExprs[COMMON] = common; 2927 SubExprs[COND] = cond; 2928 SubExprs[LHS] = lhs; 2929 SubExprs[RHS] = rhs; 2930 2931 OpaqueValue->setSourceExpr(common); 2932 } 2933 2934 /// \brief Build an empty conditional operator. 2935 explicit BinaryConditionalOperator(EmptyShell Empty) 2936 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 2937 2938 /// \brief getCommon - Return the common expression, written to the 2939 /// left of the condition. The opaque value will be bound to the 2940 /// result of this expression. 2941 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 2942 2943 /// \brief getOpaqueValue - Return the opaque value placeholder. 2944 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 2945 2946 /// \brief getCond - Return the condition expression; this is defined 2947 /// in terms of the opaque value. 2948 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2949 2950 /// \brief getTrueExpr - Return the subexpression which will be 2951 /// evaluated if the condition evaluates to true; this is defined 2952 /// in terms of the opaque value. 2953 Expr *getTrueExpr() const { 2954 return cast<Expr>(SubExprs[LHS]); 2955 } 2956 2957 /// \brief getFalseExpr - Return the subexpression which will be 2958 /// evaluated if the condnition evaluates to false; this is 2959 /// defined in terms of the opaque value. 2960 Expr *getFalseExpr() const { 2961 return cast<Expr>(SubExprs[RHS]); 2962 } 2963 2964 SourceRange getSourceRange() const { 2965 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 2966 } 2967 static bool classof(const Stmt *T) { 2968 return T->getStmtClass() == BinaryConditionalOperatorClass; 2969 } 2970 static bool classof(const BinaryConditionalOperator *) { return true; } 2971 2972 // Iterators 2973 child_range children() { 2974 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 2975 } 2976}; 2977 2978inline Expr *AbstractConditionalOperator::getCond() const { 2979 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2980 return co->getCond(); 2981 return cast<BinaryConditionalOperator>(this)->getCond(); 2982} 2983 2984inline Expr *AbstractConditionalOperator::getTrueExpr() const { 2985 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2986 return co->getTrueExpr(); 2987 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 2988} 2989 2990inline Expr *AbstractConditionalOperator::getFalseExpr() const { 2991 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2992 return co->getFalseExpr(); 2993 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 2994} 2995 2996/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2997class AddrLabelExpr : public Expr { 2998 SourceLocation AmpAmpLoc, LabelLoc; 2999 LabelDecl *Label; 3000public: 3001 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3002 QualType t) 3003 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3004 false), 3005 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3006 3007 /// \brief Build an empty address of a label expression. 3008 explicit AddrLabelExpr(EmptyShell Empty) 3009 : Expr(AddrLabelExprClass, Empty) { } 3010 3011 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3012 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3013 SourceLocation getLabelLoc() const { return LabelLoc; } 3014 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3015 3016 SourceRange getSourceRange() const { 3017 return SourceRange(AmpAmpLoc, LabelLoc); 3018 } 3019 3020 LabelDecl *getLabel() const { return Label; } 3021 void setLabel(LabelDecl *L) { Label = L; } 3022 3023 static bool classof(const Stmt *T) { 3024 return T->getStmtClass() == AddrLabelExprClass; 3025 } 3026 static bool classof(const AddrLabelExpr *) { return true; } 3027 3028 // Iterators 3029 child_range children() { return child_range(); } 3030}; 3031 3032/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3033/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3034/// takes the value of the last subexpression. 3035/// 3036/// A StmtExpr is always an r-value; values "returned" out of a 3037/// StmtExpr will be copied. 3038class StmtExpr : public Expr { 3039 Stmt *SubStmt; 3040 SourceLocation LParenLoc, RParenLoc; 3041public: 3042 // FIXME: Does type-dependence need to be computed differently? 3043 // FIXME: Do we need to compute instantiation instantiation-dependence for 3044 // statements? (ugh!) 3045 StmtExpr(CompoundStmt *substmt, QualType T, 3046 SourceLocation lp, SourceLocation rp) : 3047 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3048 T->isDependentType(), false, false, false), 3049 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3050 3051 /// \brief Build an empty statement expression. 3052 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3053 3054 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3055 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3056 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3057 3058 SourceRange getSourceRange() const { 3059 return SourceRange(LParenLoc, RParenLoc); 3060 } 3061 3062 SourceLocation getLParenLoc() const { return LParenLoc; } 3063 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3064 SourceLocation getRParenLoc() const { return RParenLoc; } 3065 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3066 3067 static bool classof(const Stmt *T) { 3068 return T->getStmtClass() == StmtExprClass; 3069 } 3070 static bool classof(const StmtExpr *) { return true; } 3071 3072 // Iterators 3073 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3074}; 3075 3076 3077/// ShuffleVectorExpr - clang-specific builtin-in function 3078/// __builtin_shufflevector. 3079/// This AST node represents a operator that does a constant 3080/// shuffle, similar to LLVM's shufflevector instruction. It takes 3081/// two vectors and a variable number of constant indices, 3082/// and returns the appropriately shuffled vector. 3083class ShuffleVectorExpr : public Expr { 3084 SourceLocation BuiltinLoc, RParenLoc; 3085 3086 // SubExprs - the list of values passed to the __builtin_shufflevector 3087 // function. The first two are vectors, and the rest are constant 3088 // indices. The number of values in this list is always 3089 // 2+the number of indices in the vector type. 3090 Stmt **SubExprs; 3091 unsigned NumExprs; 3092 3093public: 3094 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3095 QualType Type, SourceLocation BLoc, 3096 SourceLocation RP); 3097 3098 /// \brief Build an empty vector-shuffle expression. 3099 explicit ShuffleVectorExpr(EmptyShell Empty) 3100 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3101 3102 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3103 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3104 3105 SourceLocation getRParenLoc() const { return RParenLoc; } 3106 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3107 3108 SourceRange getSourceRange() const { 3109 return SourceRange(BuiltinLoc, RParenLoc); 3110 } 3111 static bool classof(const Stmt *T) { 3112 return T->getStmtClass() == ShuffleVectorExprClass; 3113 } 3114 static bool classof(const ShuffleVectorExpr *) { return true; } 3115 3116 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3117 /// constant expression, the actual arguments passed in, and the function 3118 /// pointers. 3119 unsigned getNumSubExprs() const { return NumExprs; } 3120 3121 /// \brief Retrieve the array of expressions. 3122 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3123 3124 /// getExpr - Return the Expr at the specified index. 3125 Expr *getExpr(unsigned Index) { 3126 assert((Index < NumExprs) && "Arg access out of range!"); 3127 return cast<Expr>(SubExprs[Index]); 3128 } 3129 const Expr *getExpr(unsigned Index) const { 3130 assert((Index < NumExprs) && "Arg access out of range!"); 3131 return cast<Expr>(SubExprs[Index]); 3132 } 3133 3134 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3135 3136 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3137 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3138 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3139 } 3140 3141 // Iterators 3142 child_range children() { 3143 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3144 } 3145}; 3146 3147/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3148/// This AST node is similar to the conditional operator (?:) in C, with 3149/// the following exceptions: 3150/// - the test expression must be a integer constant expression. 3151/// - the expression returned acts like the chosen subexpression in every 3152/// visible way: the type is the same as that of the chosen subexpression, 3153/// and all predicates (whether it's an l-value, whether it's an integer 3154/// constant expression, etc.) return the same result as for the chosen 3155/// sub-expression. 3156class ChooseExpr : public Expr { 3157 enum { COND, LHS, RHS, END_EXPR }; 3158 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3159 SourceLocation BuiltinLoc, RParenLoc; 3160public: 3161 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3162 QualType t, ExprValueKind VK, ExprObjectKind OK, 3163 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3164 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3165 (cond->isInstantiationDependent() || 3166 lhs->isInstantiationDependent() || 3167 rhs->isInstantiationDependent()), 3168 (cond->containsUnexpandedParameterPack() || 3169 lhs->containsUnexpandedParameterPack() || 3170 rhs->containsUnexpandedParameterPack())), 3171 BuiltinLoc(BLoc), RParenLoc(RP) { 3172 SubExprs[COND] = cond; 3173 SubExprs[LHS] = lhs; 3174 SubExprs[RHS] = rhs; 3175 } 3176 3177 /// \brief Build an empty __builtin_choose_expr. 3178 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3179 3180 /// isConditionTrue - Return whether the condition is true (i.e. not 3181 /// equal to zero). 3182 bool isConditionTrue(const ASTContext &C) const; 3183 3184 /// getChosenSubExpr - Return the subexpression chosen according to the 3185 /// condition. 3186 Expr *getChosenSubExpr(const ASTContext &C) const { 3187 return isConditionTrue(C) ? getLHS() : getRHS(); 3188 } 3189 3190 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3191 void setCond(Expr *E) { SubExprs[COND] = E; } 3192 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3193 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3194 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3195 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3196 3197 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3198 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3199 3200 SourceLocation getRParenLoc() const { return RParenLoc; } 3201 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3202 3203 SourceRange getSourceRange() const { 3204 return SourceRange(BuiltinLoc, RParenLoc); 3205 } 3206 static bool classof(const Stmt *T) { 3207 return T->getStmtClass() == ChooseExprClass; 3208 } 3209 static bool classof(const ChooseExpr *) { return true; } 3210 3211 // Iterators 3212 child_range children() { 3213 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3214 } 3215}; 3216 3217/// GNUNullExpr - Implements the GNU __null extension, which is a name 3218/// for a null pointer constant that has integral type (e.g., int or 3219/// long) and is the same size and alignment as a pointer. The __null 3220/// extension is typically only used by system headers, which define 3221/// NULL as __null in C++ rather than using 0 (which is an integer 3222/// that may not match the size of a pointer). 3223class GNUNullExpr : public Expr { 3224 /// TokenLoc - The location of the __null keyword. 3225 SourceLocation TokenLoc; 3226 3227public: 3228 GNUNullExpr(QualType Ty, SourceLocation Loc) 3229 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3230 false), 3231 TokenLoc(Loc) { } 3232 3233 /// \brief Build an empty GNU __null expression. 3234 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3235 3236 /// getTokenLocation - The location of the __null token. 3237 SourceLocation getTokenLocation() const { return TokenLoc; } 3238 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3239 3240 SourceRange getSourceRange() const { 3241 return SourceRange(TokenLoc); 3242 } 3243 static bool classof(const Stmt *T) { 3244 return T->getStmtClass() == GNUNullExprClass; 3245 } 3246 static bool classof(const GNUNullExpr *) { return true; } 3247 3248 // Iterators 3249 child_range children() { return child_range(); } 3250}; 3251 3252/// VAArgExpr, used for the builtin function __builtin_va_arg. 3253class VAArgExpr : public Expr { 3254 Stmt *Val; 3255 TypeSourceInfo *TInfo; 3256 SourceLocation BuiltinLoc, RParenLoc; 3257public: 3258 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3259 SourceLocation RPLoc, QualType t) 3260 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3261 t->isDependentType(), false, 3262 (TInfo->getType()->isInstantiationDependentType() || 3263 e->isInstantiationDependent()), 3264 (TInfo->getType()->containsUnexpandedParameterPack() || 3265 e->containsUnexpandedParameterPack())), 3266 Val(e), TInfo(TInfo), 3267 BuiltinLoc(BLoc), 3268 RParenLoc(RPLoc) { } 3269 3270 /// \brief Create an empty __builtin_va_arg expression. 3271 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3272 3273 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3274 Expr *getSubExpr() { return cast<Expr>(Val); } 3275 void setSubExpr(Expr *E) { Val = E; } 3276 3277 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3278 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3279 3280 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3281 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3282 3283 SourceLocation getRParenLoc() const { return RParenLoc; } 3284 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3285 3286 SourceRange getSourceRange() const { 3287 return SourceRange(BuiltinLoc, RParenLoc); 3288 } 3289 static bool classof(const Stmt *T) { 3290 return T->getStmtClass() == VAArgExprClass; 3291 } 3292 static bool classof(const VAArgExpr *) { return true; } 3293 3294 // Iterators 3295 child_range children() { return child_range(&Val, &Val+1); } 3296}; 3297 3298/// @brief Describes an C or C++ initializer list. 3299/// 3300/// InitListExpr describes an initializer list, which can be used to 3301/// initialize objects of different types, including 3302/// struct/class/union types, arrays, and vectors. For example: 3303/// 3304/// @code 3305/// struct foo x = { 1, { 2, 3 } }; 3306/// @endcode 3307/// 3308/// Prior to semantic analysis, an initializer list will represent the 3309/// initializer list as written by the user, but will have the 3310/// placeholder type "void". This initializer list is called the 3311/// syntactic form of the initializer, and may contain C99 designated 3312/// initializers (represented as DesignatedInitExprs), initializations 3313/// of subobject members without explicit braces, and so on. Clients 3314/// interested in the original syntax of the initializer list should 3315/// use the syntactic form of the initializer list. 3316/// 3317/// After semantic analysis, the initializer list will represent the 3318/// semantic form of the initializer, where the initializations of all 3319/// subobjects are made explicit with nested InitListExpr nodes and 3320/// C99 designators have been eliminated by placing the designated 3321/// initializations into the subobject they initialize. Additionally, 3322/// any "holes" in the initialization, where no initializer has been 3323/// specified for a particular subobject, will be replaced with 3324/// implicitly-generated ImplicitValueInitExpr expressions that 3325/// value-initialize the subobjects. Note, however, that the 3326/// initializer lists may still have fewer initializers than there are 3327/// elements to initialize within the object. 3328/// 3329/// Given the semantic form of the initializer list, one can retrieve 3330/// the original syntactic form of that initializer list (if it 3331/// exists) using getSyntacticForm(). Since many initializer lists 3332/// have the same syntactic and semantic forms, getSyntacticForm() may 3333/// return NULL, indicating that the current initializer list also 3334/// serves as its syntactic form. 3335class InitListExpr : public Expr { 3336 // FIXME: Eliminate this vector in favor of ASTContext allocation 3337 typedef ASTVector<Stmt *> InitExprsTy; 3338 InitExprsTy InitExprs; 3339 SourceLocation LBraceLoc, RBraceLoc; 3340 3341 /// Contains the initializer list that describes the syntactic form 3342 /// written in the source code. 3343 InitListExpr *SyntacticForm; 3344 3345 /// \brief Either: 3346 /// If this initializer list initializes an array with more elements than 3347 /// there are initializers in the list, specifies an expression to be used 3348 /// for value initialization of the rest of the elements. 3349 /// Or 3350 /// If this initializer list initializes a union, specifies which 3351 /// field within the union will be initialized. 3352 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3353 3354 /// Whether this initializer list originally had a GNU array-range 3355 /// designator in it. This is a temporary marker used by CodeGen. 3356 bool HadArrayRangeDesignator; 3357 3358public: 3359 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3360 Expr **initexprs, unsigned numinits, 3361 SourceLocation rbraceloc); 3362 3363 /// \brief Build an empty initializer list. 3364 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3365 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3366 3367 unsigned getNumInits() const { return InitExprs.size(); } 3368 3369 /// \brief Retrieve the set of initializers. 3370 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3371 3372 const Expr *getInit(unsigned Init) const { 3373 assert(Init < getNumInits() && "Initializer access out of range!"); 3374 return cast_or_null<Expr>(InitExprs[Init]); 3375 } 3376 3377 Expr *getInit(unsigned Init) { 3378 assert(Init < getNumInits() && "Initializer access out of range!"); 3379 return cast_or_null<Expr>(InitExprs[Init]); 3380 } 3381 3382 void setInit(unsigned Init, Expr *expr) { 3383 assert(Init < getNumInits() && "Initializer access out of range!"); 3384 InitExprs[Init] = expr; 3385 } 3386 3387 /// \brief Reserve space for some number of initializers. 3388 void reserveInits(ASTContext &C, unsigned NumInits); 3389 3390 /// @brief Specify the number of initializers 3391 /// 3392 /// If there are more than @p NumInits initializers, the remaining 3393 /// initializers will be destroyed. If there are fewer than @p 3394 /// NumInits initializers, NULL expressions will be added for the 3395 /// unknown initializers. 3396 void resizeInits(ASTContext &Context, unsigned NumInits); 3397 3398 /// @brief Updates the initializer at index @p Init with the new 3399 /// expression @p expr, and returns the old expression at that 3400 /// location. 3401 /// 3402 /// When @p Init is out of range for this initializer list, the 3403 /// initializer list will be extended with NULL expressions to 3404 /// accommodate the new entry. 3405 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3406 3407 /// \brief If this initializer list initializes an array with more elements 3408 /// than there are initializers in the list, specifies an expression to be 3409 /// used for value initialization of the rest of the elements. 3410 Expr *getArrayFiller() { 3411 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3412 } 3413 const Expr *getArrayFiller() const { 3414 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3415 } 3416 void setArrayFiller(Expr *filler); 3417 3418 /// \brief Return true if this is an array initializer and its array "filler" 3419 /// has been set. 3420 bool hasArrayFiller() const { return getArrayFiller(); } 3421 3422 /// \brief If this initializes a union, specifies which field in the 3423 /// union to initialize. 3424 /// 3425 /// Typically, this field is the first named field within the 3426 /// union. However, a designated initializer can specify the 3427 /// initialization of a different field within the union. 3428 FieldDecl *getInitializedFieldInUnion() { 3429 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3430 } 3431 const FieldDecl *getInitializedFieldInUnion() const { 3432 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3433 } 3434 void setInitializedFieldInUnion(FieldDecl *FD) { 3435 ArrayFillerOrUnionFieldInit = FD; 3436 } 3437 3438 // Explicit InitListExpr's originate from source code (and have valid source 3439 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3440 bool isExplicit() { 3441 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3442 } 3443 3444 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3445 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3446 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3447 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3448 3449 /// @brief Retrieve the initializer list that describes the 3450 /// syntactic form of the initializer. 3451 /// 3452 /// 3453 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3454 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3455 3456 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3457 void sawArrayRangeDesignator(bool ARD = true) { 3458 HadArrayRangeDesignator = ARD; 3459 } 3460 3461 SourceRange getSourceRange() const; 3462 3463 static bool classof(const Stmt *T) { 3464 return T->getStmtClass() == InitListExprClass; 3465 } 3466 static bool classof(const InitListExpr *) { return true; } 3467 3468 // Iterators 3469 child_range children() { 3470 if (InitExprs.empty()) return child_range(); 3471 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3472 } 3473 3474 typedef InitExprsTy::iterator iterator; 3475 typedef InitExprsTy::const_iterator const_iterator; 3476 typedef InitExprsTy::reverse_iterator reverse_iterator; 3477 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3478 3479 iterator begin() { return InitExprs.begin(); } 3480 const_iterator begin() const { return InitExprs.begin(); } 3481 iterator end() { return InitExprs.end(); } 3482 const_iterator end() const { return InitExprs.end(); } 3483 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3484 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3485 reverse_iterator rend() { return InitExprs.rend(); } 3486 const_reverse_iterator rend() const { return InitExprs.rend(); } 3487 3488 friend class ASTStmtReader; 3489 friend class ASTStmtWriter; 3490}; 3491 3492/// @brief Represents a C99 designated initializer expression. 3493/// 3494/// A designated initializer expression (C99 6.7.8) contains one or 3495/// more designators (which can be field designators, array 3496/// designators, or GNU array-range designators) followed by an 3497/// expression that initializes the field or element(s) that the 3498/// designators refer to. For example, given: 3499/// 3500/// @code 3501/// struct point { 3502/// double x; 3503/// double y; 3504/// }; 3505/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3506/// @endcode 3507/// 3508/// The InitListExpr contains three DesignatedInitExprs, the first of 3509/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3510/// designators, one array designator for @c [2] followed by one field 3511/// designator for @c .y. The initalization expression will be 1.0. 3512class DesignatedInitExpr : public Expr { 3513public: 3514 /// \brief Forward declaration of the Designator class. 3515 class Designator; 3516 3517private: 3518 /// The location of the '=' or ':' prior to the actual initializer 3519 /// expression. 3520 SourceLocation EqualOrColonLoc; 3521 3522 /// Whether this designated initializer used the GNU deprecated 3523 /// syntax rather than the C99 '=' syntax. 3524 bool GNUSyntax : 1; 3525 3526 /// The number of designators in this initializer expression. 3527 unsigned NumDesignators : 15; 3528 3529 /// \brief The designators in this designated initialization 3530 /// expression. 3531 Designator *Designators; 3532 3533 /// The number of subexpressions of this initializer expression, 3534 /// which contains both the initializer and any additional 3535 /// expressions used by array and array-range designators. 3536 unsigned NumSubExprs : 16; 3537 3538 3539 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3540 const Designator *Designators, 3541 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3542 Expr **IndexExprs, unsigned NumIndexExprs, 3543 Expr *Init); 3544 3545 explicit DesignatedInitExpr(unsigned NumSubExprs) 3546 : Expr(DesignatedInitExprClass, EmptyShell()), 3547 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3548 3549public: 3550 /// A field designator, e.g., ".x". 3551 struct FieldDesignator { 3552 /// Refers to the field that is being initialized. The low bit 3553 /// of this field determines whether this is actually a pointer 3554 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3555 /// initially constructed, a field designator will store an 3556 /// IdentifierInfo*. After semantic analysis has resolved that 3557 /// name, the field designator will instead store a FieldDecl*. 3558 uintptr_t NameOrField; 3559 3560 /// The location of the '.' in the designated initializer. 3561 unsigned DotLoc; 3562 3563 /// The location of the field name in the designated initializer. 3564 unsigned FieldLoc; 3565 }; 3566 3567 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3568 struct ArrayOrRangeDesignator { 3569 /// Location of the first index expression within the designated 3570 /// initializer expression's list of subexpressions. 3571 unsigned Index; 3572 /// The location of the '[' starting the array range designator. 3573 unsigned LBracketLoc; 3574 /// The location of the ellipsis separating the start and end 3575 /// indices. Only valid for GNU array-range designators. 3576 unsigned EllipsisLoc; 3577 /// The location of the ']' terminating the array range designator. 3578 unsigned RBracketLoc; 3579 }; 3580 3581 /// @brief Represents a single C99 designator. 3582 /// 3583 /// @todo This class is infuriatingly similar to clang::Designator, 3584 /// but minor differences (storing indices vs. storing pointers) 3585 /// keep us from reusing it. Try harder, later, to rectify these 3586 /// differences. 3587 class Designator { 3588 /// @brief The kind of designator this describes. 3589 enum { 3590 FieldDesignator, 3591 ArrayDesignator, 3592 ArrayRangeDesignator 3593 } Kind; 3594 3595 union { 3596 /// A field designator, e.g., ".x". 3597 struct FieldDesignator Field; 3598 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3599 struct ArrayOrRangeDesignator ArrayOrRange; 3600 }; 3601 friend class DesignatedInitExpr; 3602 3603 public: 3604 Designator() {} 3605 3606 /// @brief Initializes a field designator. 3607 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3608 SourceLocation FieldLoc) 3609 : Kind(FieldDesignator) { 3610 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3611 Field.DotLoc = DotLoc.getRawEncoding(); 3612 Field.FieldLoc = FieldLoc.getRawEncoding(); 3613 } 3614 3615 /// @brief Initializes an array designator. 3616 Designator(unsigned Index, SourceLocation LBracketLoc, 3617 SourceLocation RBracketLoc) 3618 : Kind(ArrayDesignator) { 3619 ArrayOrRange.Index = Index; 3620 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3621 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3622 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3623 } 3624 3625 /// @brief Initializes a GNU array-range designator. 3626 Designator(unsigned Index, SourceLocation LBracketLoc, 3627 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3628 : Kind(ArrayRangeDesignator) { 3629 ArrayOrRange.Index = Index; 3630 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3631 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3632 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3633 } 3634 3635 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3636 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3637 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3638 3639 IdentifierInfo *getFieldName() const; 3640 3641 FieldDecl *getField() const { 3642 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3643 if (Field.NameOrField & 0x01) 3644 return 0; 3645 else 3646 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3647 } 3648 3649 void setField(FieldDecl *FD) { 3650 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3651 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3652 } 3653 3654 SourceLocation getDotLoc() const { 3655 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3656 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3657 } 3658 3659 SourceLocation getFieldLoc() const { 3660 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3661 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3662 } 3663 3664 SourceLocation getLBracketLoc() const { 3665 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3666 "Only valid on an array or array-range designator"); 3667 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3668 } 3669 3670 SourceLocation getRBracketLoc() const { 3671 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3672 "Only valid on an array or array-range designator"); 3673 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3674 } 3675 3676 SourceLocation getEllipsisLoc() const { 3677 assert(Kind == ArrayRangeDesignator && 3678 "Only valid on an array-range designator"); 3679 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3680 } 3681 3682 unsigned getFirstExprIndex() const { 3683 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3684 "Only valid on an array or array-range designator"); 3685 return ArrayOrRange.Index; 3686 } 3687 3688 SourceLocation getStartLocation() const { 3689 if (Kind == FieldDesignator) 3690 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3691 else 3692 return getLBracketLoc(); 3693 } 3694 SourceLocation getEndLocation() const { 3695 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3696 } 3697 SourceRange getSourceRange() const { 3698 return SourceRange(getStartLocation(), getEndLocation()); 3699 } 3700 }; 3701 3702 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3703 unsigned NumDesignators, 3704 Expr **IndexExprs, unsigned NumIndexExprs, 3705 SourceLocation EqualOrColonLoc, 3706 bool GNUSyntax, Expr *Init); 3707 3708 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3709 3710 /// @brief Returns the number of designators in this initializer. 3711 unsigned size() const { return NumDesignators; } 3712 3713 // Iterator access to the designators. 3714 typedef Designator *designators_iterator; 3715 designators_iterator designators_begin() { return Designators; } 3716 designators_iterator designators_end() { 3717 return Designators + NumDesignators; 3718 } 3719 3720 typedef const Designator *const_designators_iterator; 3721 const_designators_iterator designators_begin() const { return Designators; } 3722 const_designators_iterator designators_end() const { 3723 return Designators + NumDesignators; 3724 } 3725 3726 typedef std::reverse_iterator<designators_iterator> 3727 reverse_designators_iterator; 3728 reverse_designators_iterator designators_rbegin() { 3729 return reverse_designators_iterator(designators_end()); 3730 } 3731 reverse_designators_iterator designators_rend() { 3732 return reverse_designators_iterator(designators_begin()); 3733 } 3734 3735 typedef std::reverse_iterator<const_designators_iterator> 3736 const_reverse_designators_iterator; 3737 const_reverse_designators_iterator designators_rbegin() const { 3738 return const_reverse_designators_iterator(designators_end()); 3739 } 3740 const_reverse_designators_iterator designators_rend() const { 3741 return const_reverse_designators_iterator(designators_begin()); 3742 } 3743 3744 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3745 3746 void setDesignators(ASTContext &C, const Designator *Desigs, 3747 unsigned NumDesigs); 3748 3749 Expr *getArrayIndex(const Designator& D); 3750 Expr *getArrayRangeStart(const Designator& D); 3751 Expr *getArrayRangeEnd(const Designator& D); 3752 3753 /// @brief Retrieve the location of the '=' that precedes the 3754 /// initializer value itself, if present. 3755 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3756 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3757 3758 /// @brief Determines whether this designated initializer used the 3759 /// deprecated GNU syntax for designated initializers. 3760 bool usesGNUSyntax() const { return GNUSyntax; } 3761 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3762 3763 /// @brief Retrieve the initializer value. 3764 Expr *getInit() const { 3765 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3766 } 3767 3768 void setInit(Expr *init) { 3769 *child_begin() = init; 3770 } 3771 3772 /// \brief Retrieve the total number of subexpressions in this 3773 /// designated initializer expression, including the actual 3774 /// initialized value and any expressions that occur within array 3775 /// and array-range designators. 3776 unsigned getNumSubExprs() const { return NumSubExprs; } 3777 3778 Expr *getSubExpr(unsigned Idx) { 3779 assert(Idx < NumSubExprs && "Subscript out of range"); 3780 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3781 Ptr += sizeof(DesignatedInitExpr); 3782 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3783 } 3784 3785 void setSubExpr(unsigned Idx, Expr *E) { 3786 assert(Idx < NumSubExprs && "Subscript out of range"); 3787 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3788 Ptr += sizeof(DesignatedInitExpr); 3789 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3790 } 3791 3792 /// \brief Replaces the designator at index @p Idx with the series 3793 /// of designators in [First, Last). 3794 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3795 const Designator *Last); 3796 3797 SourceRange getDesignatorsSourceRange() const; 3798 3799 SourceRange getSourceRange() const; 3800 3801 static bool classof(const Stmt *T) { 3802 return T->getStmtClass() == DesignatedInitExprClass; 3803 } 3804 static bool classof(const DesignatedInitExpr *) { return true; } 3805 3806 // Iterators 3807 child_range children() { 3808 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3809 return child_range(begin, begin + NumSubExprs); 3810 } 3811}; 3812 3813/// \brief Represents an implicitly-generated value initialization of 3814/// an object of a given type. 3815/// 3816/// Implicit value initializations occur within semantic initializer 3817/// list expressions (InitListExpr) as placeholders for subobject 3818/// initializations not explicitly specified by the user. 3819/// 3820/// \see InitListExpr 3821class ImplicitValueInitExpr : public Expr { 3822public: 3823 explicit ImplicitValueInitExpr(QualType ty) 3824 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3825 false, false, ty->isInstantiationDependentType(), false) { } 3826 3827 /// \brief Construct an empty implicit value initialization. 3828 explicit ImplicitValueInitExpr(EmptyShell Empty) 3829 : Expr(ImplicitValueInitExprClass, Empty) { } 3830 3831 static bool classof(const Stmt *T) { 3832 return T->getStmtClass() == ImplicitValueInitExprClass; 3833 } 3834 static bool classof(const ImplicitValueInitExpr *) { return true; } 3835 3836 SourceRange getSourceRange() const { 3837 return SourceRange(); 3838 } 3839 3840 // Iterators 3841 child_range children() { return child_range(); } 3842}; 3843 3844 3845class ParenListExpr : public Expr { 3846 Stmt **Exprs; 3847 unsigned NumExprs; 3848 SourceLocation LParenLoc, RParenLoc; 3849 3850public: 3851 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3852 unsigned numexprs, SourceLocation rparenloc, QualType T); 3853 3854 /// \brief Build an empty paren list. 3855 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3856 3857 unsigned getNumExprs() const { return NumExprs; } 3858 3859 const Expr* getExpr(unsigned Init) const { 3860 assert(Init < getNumExprs() && "Initializer access out of range!"); 3861 return cast_or_null<Expr>(Exprs[Init]); 3862 } 3863 3864 Expr* getExpr(unsigned Init) { 3865 assert(Init < getNumExprs() && "Initializer access out of range!"); 3866 return cast_or_null<Expr>(Exprs[Init]); 3867 } 3868 3869 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3870 3871 SourceLocation getLParenLoc() const { return LParenLoc; } 3872 SourceLocation getRParenLoc() const { return RParenLoc; } 3873 3874 SourceRange getSourceRange() const { 3875 return SourceRange(LParenLoc, RParenLoc); 3876 } 3877 static bool classof(const Stmt *T) { 3878 return T->getStmtClass() == ParenListExprClass; 3879 } 3880 static bool classof(const ParenListExpr *) { return true; } 3881 3882 // Iterators 3883 child_range children() { 3884 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 3885 } 3886 3887 friend class ASTStmtReader; 3888 friend class ASTStmtWriter; 3889}; 3890 3891 3892/// \brief Represents a C1X generic selection. 3893/// 3894/// A generic selection (C1X 6.5.1.1) contains an unevaluated controlling 3895/// expression, followed by one or more generic associations. Each generic 3896/// association specifies a type name and an expression, or "default" and an 3897/// expression (in which case it is known as a default generic association). 3898/// The type and value of the generic selection are identical to those of its 3899/// result expression, which is defined as the expression in the generic 3900/// association with a type name that is compatible with the type of the 3901/// controlling expression, or the expression in the default generic association 3902/// if no types are compatible. For example: 3903/// 3904/// @code 3905/// _Generic(X, double: 1, float: 2, default: 3) 3906/// @endcode 3907/// 3908/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 3909/// or 3 if "hello". 3910/// 3911/// As an extension, generic selections are allowed in C++, where the following 3912/// additional semantics apply: 3913/// 3914/// Any generic selection whose controlling expression is type-dependent or 3915/// which names a dependent type in its association list is result-dependent, 3916/// which means that the choice of result expression is dependent. 3917/// Result-dependent generic associations are both type- and value-dependent. 3918class GenericSelectionExpr : public Expr { 3919 enum { CONTROLLING, END_EXPR }; 3920 TypeSourceInfo **AssocTypes; 3921 Stmt **SubExprs; 3922 unsigned NumAssocs, ResultIndex; 3923 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 3924 3925public: 3926 GenericSelectionExpr(ASTContext &Context, 3927 SourceLocation GenericLoc, Expr *ControllingExpr, 3928 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3929 unsigned NumAssocs, SourceLocation DefaultLoc, 3930 SourceLocation RParenLoc, 3931 bool ContainsUnexpandedParameterPack, 3932 unsigned ResultIndex); 3933 3934 /// This constructor is used in the result-dependent case. 3935 GenericSelectionExpr(ASTContext &Context, 3936 SourceLocation GenericLoc, Expr *ControllingExpr, 3937 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3938 unsigned NumAssocs, SourceLocation DefaultLoc, 3939 SourceLocation RParenLoc, 3940 bool ContainsUnexpandedParameterPack); 3941 3942 explicit GenericSelectionExpr(EmptyShell Empty) 3943 : Expr(GenericSelectionExprClass, Empty) { } 3944 3945 unsigned getNumAssocs() const { return NumAssocs; } 3946 3947 SourceLocation getGenericLoc() const { return GenericLoc; } 3948 SourceLocation getDefaultLoc() const { return DefaultLoc; } 3949 SourceLocation getRParenLoc() const { return RParenLoc; } 3950 3951 const Expr *getAssocExpr(unsigned i) const { 3952 return cast<Expr>(SubExprs[END_EXPR+i]); 3953 } 3954 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 3955 3956 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 3957 return AssocTypes[i]; 3958 } 3959 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 3960 3961 QualType getAssocType(unsigned i) const { 3962 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 3963 return TS->getType(); 3964 else 3965 return QualType(); 3966 } 3967 3968 const Expr *getControllingExpr() const { 3969 return cast<Expr>(SubExprs[CONTROLLING]); 3970 } 3971 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 3972 3973 /// Whether this generic selection is result-dependent. 3974 bool isResultDependent() const { return ResultIndex == -1U; } 3975 3976 /// The zero-based index of the result expression's generic association in 3977 /// the generic selection's association list. Defined only if the 3978 /// generic selection is not result-dependent. 3979 unsigned getResultIndex() const { 3980 assert(!isResultDependent() && "Generic selection is result-dependent"); 3981 return ResultIndex; 3982 } 3983 3984 /// The generic selection's result expression. Defined only if the 3985 /// generic selection is not result-dependent. 3986 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 3987 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 3988 3989 SourceRange getSourceRange() const { 3990 return SourceRange(GenericLoc, RParenLoc); 3991 } 3992 static bool classof(const Stmt *T) { 3993 return T->getStmtClass() == GenericSelectionExprClass; 3994 } 3995 static bool classof(const GenericSelectionExpr *) { return true; } 3996 3997 child_range children() { 3998 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 3999 } 4000 4001 friend class ASTStmtReader; 4002}; 4003 4004//===----------------------------------------------------------------------===// 4005// Clang Extensions 4006//===----------------------------------------------------------------------===// 4007 4008 4009/// ExtVectorElementExpr - This represents access to specific elements of a 4010/// vector, and may occur on the left hand side or right hand side. For example 4011/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4012/// 4013/// Note that the base may have either vector or pointer to vector type, just 4014/// like a struct field reference. 4015/// 4016class ExtVectorElementExpr : public Expr { 4017 Stmt *Base; 4018 IdentifierInfo *Accessor; 4019 SourceLocation AccessorLoc; 4020public: 4021 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4022 IdentifierInfo &accessor, SourceLocation loc) 4023 : Expr(ExtVectorElementExprClass, ty, VK, 4024 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4025 base->isTypeDependent(), base->isValueDependent(), 4026 base->isInstantiationDependent(), 4027 base->containsUnexpandedParameterPack()), 4028 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4029 4030 /// \brief Build an empty vector element expression. 4031 explicit ExtVectorElementExpr(EmptyShell Empty) 4032 : Expr(ExtVectorElementExprClass, Empty) { } 4033 4034 const Expr *getBase() const { return cast<Expr>(Base); } 4035 Expr *getBase() { return cast<Expr>(Base); } 4036 void setBase(Expr *E) { Base = E; } 4037 4038 IdentifierInfo &getAccessor() const { return *Accessor; } 4039 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4040 4041 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4042 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4043 4044 /// getNumElements - Get the number of components being selected. 4045 unsigned getNumElements() const; 4046 4047 /// containsDuplicateElements - Return true if any element access is 4048 /// repeated. 4049 bool containsDuplicateElements() const; 4050 4051 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4052 /// aggregate Constant of ConstantInt(s). 4053 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4054 4055 SourceRange getSourceRange() const { 4056 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4057 } 4058 4059 /// isArrow - Return true if the base expression is a pointer to vector, 4060 /// return false if the base expression is a vector. 4061 bool isArrow() const; 4062 4063 static bool classof(const Stmt *T) { 4064 return T->getStmtClass() == ExtVectorElementExprClass; 4065 } 4066 static bool classof(const ExtVectorElementExpr *) { return true; } 4067 4068 // Iterators 4069 child_range children() { return child_range(&Base, &Base+1); } 4070}; 4071 4072 4073/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4074/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4075class BlockExpr : public Expr { 4076protected: 4077 BlockDecl *TheBlock; 4078public: 4079 BlockExpr(BlockDecl *BD, QualType ty) 4080 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4081 ty->isDependentType(), false, 4082 // FIXME: Check for instantiate-dependence in the statement? 4083 ty->isInstantiationDependentType(), 4084 false), 4085 TheBlock(BD) {} 4086 4087 /// \brief Build an empty block expression. 4088 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4089 4090 const BlockDecl *getBlockDecl() const { return TheBlock; } 4091 BlockDecl *getBlockDecl() { return TheBlock; } 4092 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4093 4094 // Convenience functions for probing the underlying BlockDecl. 4095 SourceLocation getCaretLocation() const; 4096 const Stmt *getBody() const; 4097 Stmt *getBody(); 4098 4099 SourceRange getSourceRange() const { 4100 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4101 } 4102 4103 /// getFunctionType - Return the underlying function type for this block. 4104 const FunctionType *getFunctionType() const; 4105 4106 static bool classof(const Stmt *T) { 4107 return T->getStmtClass() == BlockExprClass; 4108 } 4109 static bool classof(const BlockExpr *) { return true; } 4110 4111 // Iterators 4112 child_range children() { return child_range(); } 4113}; 4114 4115/// BlockDeclRefExpr - A reference to a local variable declared in an 4116/// enclosing scope. 4117class BlockDeclRefExpr : public Expr { 4118 VarDecl *D; 4119 SourceLocation Loc; 4120 bool IsByRef : 1; 4121 bool ConstQualAdded : 1; 4122public: 4123 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 4124 SourceLocation l, bool ByRef, bool constAdded = false); 4125 4126 // \brief Build an empty reference to a declared variable in a 4127 // block. 4128 explicit BlockDeclRefExpr(EmptyShell Empty) 4129 : Expr(BlockDeclRefExprClass, Empty) { } 4130 4131 VarDecl *getDecl() { return D; } 4132 const VarDecl *getDecl() const { return D; } 4133 void setDecl(VarDecl *VD) { D = VD; } 4134 4135 SourceLocation getLocation() const { return Loc; } 4136 void setLocation(SourceLocation L) { Loc = L; } 4137 4138 SourceRange getSourceRange() const { return SourceRange(Loc); } 4139 4140 bool isByRef() const { return IsByRef; } 4141 void setByRef(bool BR) { IsByRef = BR; } 4142 4143 bool isConstQualAdded() const { return ConstQualAdded; } 4144 void setConstQualAdded(bool C) { ConstQualAdded = C; } 4145 4146 static bool classof(const Stmt *T) { 4147 return T->getStmtClass() == BlockDeclRefExprClass; 4148 } 4149 static bool classof(const BlockDeclRefExpr *) { return true; } 4150 4151 // Iterators 4152 child_range children() { return child_range(); } 4153}; 4154 4155/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4156/// This AST node provides support for reinterpreting a type to another 4157/// type of the same size. 4158class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4159private: 4160 Stmt *SrcExpr; 4161 SourceLocation BuiltinLoc, RParenLoc; 4162 4163 friend class ASTReader; 4164 friend class ASTStmtReader; 4165 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4166 4167public: 4168 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4169 ExprValueKind VK, ExprObjectKind OK, 4170 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4171 : Expr(AsTypeExprClass, DstType, VK, OK, 4172 DstType->isDependentType(), 4173 DstType->isDependentType() || SrcExpr->isValueDependent(), 4174 (DstType->isInstantiationDependentType() || 4175 SrcExpr->isInstantiationDependent()), 4176 (DstType->containsUnexpandedParameterPack() || 4177 SrcExpr->containsUnexpandedParameterPack())), 4178 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4179 4180 /// getSrcExpr - Return the Expr to be converted. 4181 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4182 4183 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4184 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4185 4186 /// getRParenLoc - Return the location of final right parenthesis. 4187 SourceLocation getRParenLoc() const { return RParenLoc; } 4188 4189 SourceRange getSourceRange() const { 4190 return SourceRange(BuiltinLoc, RParenLoc); 4191 } 4192 4193 static bool classof(const Stmt *T) { 4194 return T->getStmtClass() == AsTypeExprClass; 4195 } 4196 static bool classof(const AsTypeExpr *) { return true; } 4197 4198 // Iterators 4199 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4200}; 4201 4202/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4203/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4204/// similarly-named C++0x instructions. All of these instructions take one 4205/// primary pointer and at least one memory order. 4206class AtomicExpr : public Expr { 4207public: 4208 enum AtomicOp { Load, Store, CmpXchgStrong, CmpXchgWeak, Xchg, 4209 Add, Sub, And, Or, Xor }; 4210private: 4211 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, END_EXPR }; 4212 Stmt* SubExprs[END_EXPR]; 4213 unsigned NumSubExprs; 4214 SourceLocation BuiltinLoc, RParenLoc; 4215 AtomicOp Op; 4216 4217public: 4218 AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, QualType t, 4219 AtomicOp op, SourceLocation RP); 4220 4221 /// \brief Build an empty AtomicExpr. 4222 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4223 4224 Expr *getPtr() const { 4225 return cast<Expr>(SubExprs[PTR]); 4226 } 4227 void setPtr(Expr *E) { 4228 SubExprs[PTR] = E; 4229 } 4230 Expr *getOrder() const { 4231 return cast<Expr>(SubExprs[ORDER]); 4232 } 4233 void setOrder(Expr *E) { 4234 SubExprs[ORDER] = E; 4235 } 4236 Expr *getVal1() const { 4237 assert(NumSubExprs >= 3); 4238 return cast<Expr>(SubExprs[VAL1]); 4239 } 4240 void setVal1(Expr *E) { 4241 assert(NumSubExprs >= 3); 4242 SubExprs[VAL1] = E; 4243 } 4244 Expr *getOrderFail() const { 4245 assert(NumSubExprs == 5); 4246 return cast<Expr>(SubExprs[ORDER_FAIL]); 4247 } 4248 void setOrderFail(Expr *E) { 4249 assert(NumSubExprs == 5); 4250 SubExprs[ORDER_FAIL] = E; 4251 } 4252 Expr *getVal2() const { 4253 assert(NumSubExprs == 5); 4254 return cast<Expr>(SubExprs[VAL2]); 4255 } 4256 void setVal2(Expr *E) { 4257 assert(NumSubExprs == 5); 4258 SubExprs[VAL2] = E; 4259 } 4260 4261 AtomicOp getOp() const { return Op; } 4262 void setOp(AtomicOp op) { Op = op; } 4263 unsigned getNumSubExprs() { return NumSubExprs; } 4264 void setNumSubExprs(unsigned num) { NumSubExprs = num; } 4265 4266 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4267 4268 bool isVolatile() const { 4269 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4270 } 4271 4272 bool isCmpXChg() const { 4273 return getOp() == AtomicExpr::CmpXchgStrong || 4274 getOp() == AtomicExpr::CmpXchgWeak; 4275 } 4276 4277 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4278 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 4279 4280 SourceLocation getRParenLoc() const { return RParenLoc; } 4281 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 4282 4283 SourceRange getSourceRange() const { 4284 return SourceRange(BuiltinLoc, RParenLoc); 4285 } 4286 static bool classof(const Stmt *T) { 4287 return T->getStmtClass() == AtomicExprClass; 4288 } 4289 static bool classof(const AtomicExpr *) { return true; } 4290 4291 // Iterators 4292 child_range children() { 4293 return child_range(SubExprs, SubExprs+NumSubExprs); 4294 } 4295}; 4296} // end namespace clang 4297 4298#endif 4299