Expr.h revision 561f81243f665cf2001caadc45df505f826b72d6
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/UsuallyTinyPtrVector.h" 24#include "clang/Basic/TypeTraits.h" 25#include "llvm/ADT/APSInt.h" 26#include "llvm/ADT/APFloat.h" 27#include "llvm/ADT/SmallVector.h" 28#include "llvm/ADT/StringRef.h" 29#include <cctype> 30 31namespace clang { 32 class ASTContext; 33 class APValue; 34 class Decl; 35 class IdentifierInfo; 36 class ParmVarDecl; 37 class NamedDecl; 38 class ValueDecl; 39 class BlockDecl; 40 class CXXBaseSpecifier; 41 class CXXOperatorCallExpr; 42 class CXXMemberCallExpr; 43 class ObjCPropertyRefExpr; 44 class TemplateArgumentLoc; 45 class TemplateArgumentListInfo; 46 class OpaqueValueExpr; 47 48/// \brief A simple array of base specifiers. 49typedef llvm::SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 50 51/// Expr - This represents one expression. Note that Expr's are subclasses of 52/// Stmt. This allows an expression to be transparently used any place a Stmt 53/// is required. 54/// 55class Expr : public Stmt { 56 QualType TR; 57 58protected: 59 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 60 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 61 : Stmt(SC) 62 { 63 ExprBits.TypeDependent = TD; 64 ExprBits.ValueDependent = VD; 65 ExprBits.InstantiationDependent = ID; 66 ExprBits.ValueKind = VK; 67 ExprBits.ObjectKind = OK; 68 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 69 setType(T); 70 } 71 72 /// \brief Construct an empty expression. 73 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 74 75public: 76 QualType getType() const { return TR; } 77 void setType(QualType t) { 78 // In C++, the type of an expression is always adjusted so that it 79 // will not have reference type an expression will never have 80 // reference type (C++ [expr]p6). Use 81 // QualType::getNonReferenceType() to retrieve the non-reference 82 // type. Additionally, inspect Expr::isLvalue to determine whether 83 // an expression that is adjusted in this manner should be 84 // considered an lvalue. 85 assert((t.isNull() || !t->isReferenceType()) && 86 "Expressions can't have reference type"); 87 88 TR = t; 89 } 90 91 /// isValueDependent - Determines whether this expression is 92 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 93 /// array bound of "Chars" in the following example is 94 /// value-dependent. 95 /// @code 96 /// template<int Size, char (&Chars)[Size]> struct meta_string; 97 /// @endcode 98 bool isValueDependent() const { return ExprBits.ValueDependent; } 99 100 /// \brief Set whether this expression is value-dependent or not. 101 void setValueDependent(bool VD) { 102 ExprBits.ValueDependent = VD; 103 if (VD) 104 ExprBits.InstantiationDependent = true; 105 } 106 107 /// isTypeDependent - Determines whether this expression is 108 /// type-dependent (C++ [temp.dep.expr]), which means that its type 109 /// could change from one template instantiation to the next. For 110 /// example, the expressions "x" and "x + y" are type-dependent in 111 /// the following code, but "y" is not type-dependent: 112 /// @code 113 /// template<typename T> 114 /// void add(T x, int y) { 115 /// x + y; 116 /// } 117 /// @endcode 118 bool isTypeDependent() const { return ExprBits.TypeDependent; } 119 120 /// \brief Set whether this expression is type-dependent or not. 121 void setTypeDependent(bool TD) { 122 ExprBits.TypeDependent = TD; 123 if (TD) 124 ExprBits.InstantiationDependent = true; 125 } 126 127 /// \brief Whether this expression is instantiation-dependent, meaning that 128 /// it depends in some way on a template parameter, even if neither its type 129 /// nor (constant) value can change due to the template instantiation. 130 /// 131 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 132 /// instantiation-dependent (since it involves a template parameter \c T), but 133 /// is neither type- nor value-dependent, since the type of the inner 134 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 135 /// \c sizeof is known. 136 /// 137 /// \code 138 /// template<typename T> 139 /// void f(T x, T y) { 140 /// sizeof(sizeof(T() + T()); 141 /// } 142 /// \endcode 143 /// 144 bool isInstantiationDependent() const { 145 return ExprBits.InstantiationDependent; 146 } 147 148 /// \brief Set whether this expression is instantiation-dependent or not. 149 void setInstantiationDependent(bool ID) { 150 ExprBits.InstantiationDependent = ID; 151 } 152 153 /// \brief Whether this expression contains an unexpanded parameter 154 /// pack (for C++0x variadic templates). 155 /// 156 /// Given the following function template: 157 /// 158 /// \code 159 /// template<typename F, typename ...Types> 160 /// void forward(const F &f, Types &&...args) { 161 /// f(static_cast<Types&&>(args)...); 162 /// } 163 /// \endcode 164 /// 165 /// The expressions \c args and \c static_cast<Types&&>(args) both 166 /// contain parameter packs. 167 bool containsUnexpandedParameterPack() const { 168 return ExprBits.ContainsUnexpandedParameterPack; 169 } 170 171 /// \brief Set the bit that describes whether this expression 172 /// contains an unexpanded parameter pack. 173 void setContainsUnexpandedParameterPack(bool PP = true) { 174 ExprBits.ContainsUnexpandedParameterPack = PP; 175 } 176 177 /// getExprLoc - Return the preferred location for the arrow when diagnosing 178 /// a problem with a generic expression. 179 SourceLocation getExprLoc() const; 180 181 /// isUnusedResultAWarning - Return true if this immediate expression should 182 /// be warned about if the result is unused. If so, fill in Loc and Ranges 183 /// with location to warn on and the source range[s] to report with the 184 /// warning. 185 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 186 SourceRange &R2, ASTContext &Ctx) const; 187 188 /// isLValue - True if this expression is an "l-value" according to 189 /// the rules of the current language. C and C++ give somewhat 190 /// different rules for this concept, but in general, the result of 191 /// an l-value expression identifies a specific object whereas the 192 /// result of an r-value expression is a value detached from any 193 /// specific storage. 194 /// 195 /// C++0x divides the concept of "r-value" into pure r-values 196 /// ("pr-values") and so-called expiring values ("x-values"), which 197 /// identify specific objects that can be safely cannibalized for 198 /// their resources. This is an unfortunate abuse of terminology on 199 /// the part of the C++ committee. In Clang, when we say "r-value", 200 /// we generally mean a pr-value. 201 bool isLValue() const { return getValueKind() == VK_LValue; } 202 bool isRValue() const { return getValueKind() == VK_RValue; } 203 bool isXValue() const { return getValueKind() == VK_XValue; } 204 bool isGLValue() const { return getValueKind() != VK_RValue; } 205 206 enum LValueClassification { 207 LV_Valid, 208 LV_NotObjectType, 209 LV_IncompleteVoidType, 210 LV_DuplicateVectorComponents, 211 LV_InvalidExpression, 212 LV_InvalidMessageExpression, 213 LV_MemberFunction, 214 LV_SubObjCPropertySetting, 215 LV_ClassTemporary 216 }; 217 /// Reasons why an expression might not be an l-value. 218 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 219 220 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 221 /// does not have an incomplete type, does not have a const-qualified type, 222 /// and if it is a structure or union, does not have any member (including, 223 /// recursively, any member or element of all contained aggregates or unions) 224 /// with a const-qualified type. 225 /// 226 /// \param Loc [in] [out] - A source location which *may* be filled 227 /// in with the location of the expression making this a 228 /// non-modifiable lvalue, if specified. 229 enum isModifiableLvalueResult { 230 MLV_Valid, 231 MLV_NotObjectType, 232 MLV_IncompleteVoidType, 233 MLV_DuplicateVectorComponents, 234 MLV_InvalidExpression, 235 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 236 MLV_IncompleteType, 237 MLV_ConstQualified, 238 MLV_ArrayType, 239 MLV_NotBlockQualified, 240 MLV_ReadonlyProperty, 241 MLV_NoSetterProperty, 242 MLV_MemberFunction, 243 MLV_SubObjCPropertySetting, 244 MLV_InvalidMessageExpression, 245 MLV_ClassTemporary 246 }; 247 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 248 SourceLocation *Loc = 0) const; 249 250 /// \brief The return type of classify(). Represents the C++0x expression 251 /// taxonomy. 252 class Classification { 253 public: 254 /// \brief The various classification results. Most of these mean prvalue. 255 enum Kinds { 256 CL_LValue, 257 CL_XValue, 258 CL_Function, // Functions cannot be lvalues in C. 259 CL_Void, // Void cannot be an lvalue in C. 260 CL_AddressableVoid, // Void expression whose address can be taken in C. 261 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 262 CL_MemberFunction, // An expression referring to a member function 263 CL_SubObjCPropertySetting, 264 CL_ClassTemporary, // A prvalue of class type 265 CL_ObjCMessageRValue, // ObjC message is an rvalue 266 CL_PRValue // A prvalue for any other reason, of any other type 267 }; 268 /// \brief The results of modification testing. 269 enum ModifiableType { 270 CM_Untested, // testModifiable was false. 271 CM_Modifiable, 272 CM_RValue, // Not modifiable because it's an rvalue 273 CM_Function, // Not modifiable because it's a function; C++ only 274 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 275 CM_NotBlockQualified, // Not captured in the closure 276 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 277 CM_ConstQualified, 278 CM_ArrayType, 279 CM_IncompleteType 280 }; 281 282 private: 283 friend class Expr; 284 285 unsigned short Kind; 286 unsigned short Modifiable; 287 288 explicit Classification(Kinds k, ModifiableType m) 289 : Kind(k), Modifiable(m) 290 {} 291 292 public: 293 Classification() {} 294 295 Kinds getKind() const { return static_cast<Kinds>(Kind); } 296 ModifiableType getModifiable() const { 297 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 298 return static_cast<ModifiableType>(Modifiable); 299 } 300 bool isLValue() const { return Kind == CL_LValue; } 301 bool isXValue() const { return Kind == CL_XValue; } 302 bool isGLValue() const { return Kind <= CL_XValue; } 303 bool isPRValue() const { return Kind >= CL_Function; } 304 bool isRValue() const { return Kind >= CL_XValue; } 305 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 306 307 /// \brief Create a simple, modifiably lvalue 308 static Classification makeSimpleLValue() { 309 return Classification(CL_LValue, CM_Modifiable); 310 } 311 312 }; 313 /// \brief Classify - Classify this expression according to the C++0x 314 /// expression taxonomy. 315 /// 316 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 317 /// old lvalue vs rvalue. This function determines the type of expression this 318 /// is. There are three expression types: 319 /// - lvalues are classical lvalues as in C++03. 320 /// - prvalues are equivalent to rvalues in C++03. 321 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 322 /// function returning an rvalue reference. 323 /// lvalues and xvalues are collectively referred to as glvalues, while 324 /// prvalues and xvalues together form rvalues. 325 Classification Classify(ASTContext &Ctx) const { 326 return ClassifyImpl(Ctx, 0); 327 } 328 329 /// \brief ClassifyModifiable - Classify this expression according to the 330 /// C++0x expression taxonomy, and see if it is valid on the left side 331 /// of an assignment. 332 /// 333 /// This function extends classify in that it also tests whether the 334 /// expression is modifiable (C99 6.3.2.1p1). 335 /// \param Loc A source location that might be filled with a relevant location 336 /// if the expression is not modifiable. 337 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 338 return ClassifyImpl(Ctx, &Loc); 339 } 340 341 /// getValueKindForType - Given a formal return or parameter type, 342 /// give its value kind. 343 static ExprValueKind getValueKindForType(QualType T) { 344 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 345 return (isa<LValueReferenceType>(RT) 346 ? VK_LValue 347 : (RT->getPointeeType()->isFunctionType() 348 ? VK_LValue : VK_XValue)); 349 return VK_RValue; 350 } 351 352 /// getValueKind - The value kind that this expression produces. 353 ExprValueKind getValueKind() const { 354 return static_cast<ExprValueKind>(ExprBits.ValueKind); 355 } 356 357 /// getObjectKind - The object kind that this expression produces. 358 /// Object kinds are meaningful only for expressions that yield an 359 /// l-value or x-value. 360 ExprObjectKind getObjectKind() const { 361 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 362 } 363 364 bool isOrdinaryOrBitFieldObject() const { 365 ExprObjectKind OK = getObjectKind(); 366 return (OK == OK_Ordinary || OK == OK_BitField); 367 } 368 369 /// setValueKind - Set the value kind produced by this expression. 370 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 371 372 /// setObjectKind - Set the object kind produced by this expression. 373 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 374 375private: 376 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 377 378public: 379 380 /// \brief If this expression refers to a bit-field, retrieve the 381 /// declaration of that bit-field. 382 FieldDecl *getBitField(); 383 384 const FieldDecl *getBitField() const { 385 return const_cast<Expr*>(this)->getBitField(); 386 } 387 388 /// \brief If this expression is an l-value for an Objective C 389 /// property, find the underlying property reference expression. 390 const ObjCPropertyRefExpr *getObjCProperty() const; 391 392 /// \brief Returns whether this expression refers to a vector element. 393 bool refersToVectorElement() const; 394 395 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 396 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 397 /// but also int expressions which are produced by things like comparisons in 398 /// C. 399 bool isKnownToHaveBooleanValue() const; 400 401 /// isIntegerConstantExpr - Return true if this expression is a valid integer 402 /// constant expression, and, if so, return its value in Result. If not a 403 /// valid i-c-e, return false and fill in Loc (if specified) with the location 404 /// of the invalid expression. 405 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 406 SourceLocation *Loc = 0, 407 bool isEvaluated = true) const; 408 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 409 llvm::APSInt X; 410 return isIntegerConstantExpr(X, Ctx, Loc); 411 } 412 /// isConstantInitializer - Returns true if this expression is a constant 413 /// initializer, which can be emitted at compile-time. 414 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 415 416 /// EvalResult is a struct with detailed info about an evaluated expression. 417 struct EvalResult { 418 /// Val - This is the value the expression can be folded to. 419 APValue Val; 420 421 /// HasSideEffects - Whether the evaluated expression has side effects. 422 /// For example, (f() && 0) can be folded, but it still has side effects. 423 bool HasSideEffects; 424 425 /// Diag - If the expression is unfoldable, then Diag contains a note 426 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 427 /// position for the error, and DiagExpr is the expression that caused 428 /// the error. 429 /// If the expression is foldable, but not an integer constant expression, 430 /// Diag contains a note diagnostic that describes why it isn't an integer 431 /// constant expression. If the expression *is* an integer constant 432 /// expression, then Diag will be zero. 433 unsigned Diag; 434 const Expr *DiagExpr; 435 SourceLocation DiagLoc; 436 437 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 438 439 // isGlobalLValue - Return true if the evaluated lvalue expression 440 // is global. 441 bool isGlobalLValue() const; 442 // hasSideEffects - Return true if the evaluated expression has 443 // side effects. 444 bool hasSideEffects() const { 445 return HasSideEffects; 446 } 447 }; 448 449 /// Evaluate - Return true if this is a constant which we can fold using 450 /// any crazy technique (that has nothing to do with language standards) that 451 /// we want to. If this function returns true, it returns the folded constant 452 /// in Result. 453 bool Evaluate(EvalResult &Result, const ASTContext &Ctx) const; 454 455 /// EvaluateAsBooleanCondition - Return true if this is a constant 456 /// which we we can fold and convert to a boolean condition using 457 /// any crazy technique that we want to. 458 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 459 460 /// isEvaluatable - Call Evaluate to see if this expression can be constant 461 /// folded, but discard the result. 462 bool isEvaluatable(const ASTContext &Ctx) const; 463 464 /// HasSideEffects - This routine returns true for all those expressions 465 /// which must be evaluated each time and must not be optimized away 466 /// or evaluated at compile time. Example is a function call, volatile 467 /// variable read. 468 bool HasSideEffects(const ASTContext &Ctx) const; 469 470 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 471 /// must be called on an expression that constant folds to an integer. 472 llvm::APSInt EvaluateAsInt(const ASTContext &Ctx) const; 473 474 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 475 /// with link time known address. 476 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 477 478 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue. 479 bool EvaluateAsAnyLValue(EvalResult &Result, const ASTContext &Ctx) const; 480 481 /// \brief Enumeration used to describe the kind of Null pointer constant 482 /// returned from \c isNullPointerConstant(). 483 enum NullPointerConstantKind { 484 /// \brief Expression is not a Null pointer constant. 485 NPCK_NotNull = 0, 486 487 /// \brief Expression is a Null pointer constant built from a zero integer. 488 NPCK_ZeroInteger, 489 490 /// \brief Expression is a C++0X nullptr. 491 NPCK_CXX0X_nullptr, 492 493 /// \brief Expression is a GNU-style __null constant. 494 NPCK_GNUNull 495 }; 496 497 /// \brief Enumeration used to describe how \c isNullPointerConstant() 498 /// should cope with value-dependent expressions. 499 enum NullPointerConstantValueDependence { 500 /// \brief Specifies that the expression should never be value-dependent. 501 NPC_NeverValueDependent = 0, 502 503 /// \brief Specifies that a value-dependent expression of integral or 504 /// dependent type should be considered a null pointer constant. 505 NPC_ValueDependentIsNull, 506 507 /// \brief Specifies that a value-dependent expression should be considered 508 /// to never be a null pointer constant. 509 NPC_ValueDependentIsNotNull 510 }; 511 512 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 513 /// a Null pointer constant. The return value can further distinguish the 514 /// kind of NULL pointer constant that was detected. 515 NullPointerConstantKind isNullPointerConstant( 516 ASTContext &Ctx, 517 NullPointerConstantValueDependence NPC) const; 518 519 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 520 /// write barrier. 521 bool isOBJCGCCandidate(ASTContext &Ctx) const; 522 523 /// \brief Returns true if this expression is a bound member function. 524 bool isBoundMemberFunction(ASTContext &Ctx) const; 525 526 /// \brief Given an expression of bound-member type, find the type 527 /// of the member. Returns null if this is an *overloaded* bound 528 /// member expression. 529 static QualType findBoundMemberType(const Expr *expr); 530 531 /// \brief Result type of CanThrow(). 532 enum CanThrowResult { 533 CT_Cannot, 534 CT_Dependent, 535 CT_Can 536 }; 537 /// \brief Test if this expression, if evaluated, might throw, according to 538 /// the rules of C++ [expr.unary.noexcept]. 539 CanThrowResult CanThrow(ASTContext &C) const; 540 541 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 542 /// its subexpression. If that subexpression is also a ParenExpr, 543 /// then this method recursively returns its subexpression, and so forth. 544 /// Otherwise, the method returns the current Expr. 545 Expr *IgnoreParens(); 546 547 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 548 /// or CastExprs, returning their operand. 549 Expr *IgnoreParenCasts(); 550 551 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 552 /// ParenExpr or ImplicitCastExprs, returning their operand. 553 Expr *IgnoreParenImpCasts(); 554 555 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 556 /// call to a conversion operator, return the argument. 557 Expr *IgnoreConversionOperator(); 558 559 const Expr *IgnoreConversionOperator() const { 560 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 561 } 562 563 const Expr *IgnoreParenImpCasts() const { 564 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 565 } 566 567 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 568 /// CastExprs that represent lvalue casts, returning their operand. 569 Expr *IgnoreParenLValueCasts(); 570 571 const Expr *IgnoreParenLValueCasts() const { 572 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 573 } 574 575 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 576 /// value (including ptr->int casts of the same size). Strip off any 577 /// ParenExpr or CastExprs, returning their operand. 578 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 579 580 /// \brief Determine whether this expression is a default function argument. 581 /// 582 /// Default arguments are implicitly generated in the abstract syntax tree 583 /// by semantic analysis for function calls, object constructions, etc. in 584 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 585 /// this routine also looks through any implicit casts to determine whether 586 /// the expression is a default argument. 587 bool isDefaultArgument() const; 588 589 /// \brief Determine whether the result of this expression is a 590 /// temporary object of the given class type. 591 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 592 593 /// \brief Whether this expression is an implicit reference to 'this' in C++. 594 bool isImplicitCXXThis() const; 595 596 const Expr *IgnoreParens() const { 597 return const_cast<Expr*>(this)->IgnoreParens(); 598 } 599 const Expr *IgnoreParenCasts() const { 600 return const_cast<Expr*>(this)->IgnoreParenCasts(); 601 } 602 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 603 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 604 } 605 606 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 607 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 608 609 static bool classof(const Stmt *T) { 610 return T->getStmtClass() >= firstExprConstant && 611 T->getStmtClass() <= lastExprConstant; 612 } 613 static bool classof(const Expr *) { return true; } 614}; 615 616 617//===----------------------------------------------------------------------===// 618// Primary Expressions. 619//===----------------------------------------------------------------------===// 620 621/// OpaqueValueExpr - An expression referring to an opaque object of a 622/// fixed type and value class. These don't correspond to concrete 623/// syntax; instead they're used to express operations (usually copy 624/// operations) on values whose source is generally obvious from 625/// context. 626class OpaqueValueExpr : public Expr { 627 friend class ASTStmtReader; 628 Expr *SourceExpr; 629 SourceLocation Loc; 630 631public: 632 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 633 ExprObjectKind OK = OK_Ordinary) 634 : Expr(OpaqueValueExprClass, T, VK, OK, 635 T->isDependentType(), T->isDependentType(), 636 T->isInstantiationDependentType(), 637 false), 638 SourceExpr(0), Loc(Loc) { 639 } 640 641 /// Given an expression which invokes a copy constructor --- i.e. a 642 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 643 /// find the OpaqueValueExpr that's the source of the construction. 644 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 645 646 explicit OpaqueValueExpr(EmptyShell Empty) 647 : Expr(OpaqueValueExprClass, Empty) { } 648 649 /// \brief Retrieve the location of this expression. 650 SourceLocation getLocation() const { return Loc; } 651 652 SourceRange getSourceRange() const { 653 if (SourceExpr) return SourceExpr->getSourceRange(); 654 return Loc; 655 } 656 SourceLocation getExprLoc() const { 657 if (SourceExpr) return SourceExpr->getExprLoc(); 658 return Loc; 659 } 660 661 child_range children() { return child_range(); } 662 663 /// The source expression of an opaque value expression is the 664 /// expression which originally generated the value. This is 665 /// provided as a convenience for analyses that don't wish to 666 /// precisely model the execution behavior of the program. 667 /// 668 /// The source expression is typically set when building the 669 /// expression which binds the opaque value expression in the first 670 /// place. 671 Expr *getSourceExpr() const { return SourceExpr; } 672 void setSourceExpr(Expr *e) { SourceExpr = e; } 673 674 static bool classof(const Stmt *T) { 675 return T->getStmtClass() == OpaqueValueExprClass; 676 } 677 static bool classof(const OpaqueValueExpr *) { return true; } 678}; 679 680/// \brief Represents an explicit template argument list in C++, e.g., 681/// the "<int>" in "sort<int>". 682struct ExplicitTemplateArgumentList { 683 /// \brief The source location of the left angle bracket ('<'); 684 SourceLocation LAngleLoc; 685 686 /// \brief The source location of the right angle bracket ('>'); 687 SourceLocation RAngleLoc; 688 689 /// \brief The number of template arguments in TemplateArgs. 690 /// The actual template arguments (if any) are stored after the 691 /// ExplicitTemplateArgumentList structure. 692 unsigned NumTemplateArgs; 693 694 /// \brief Retrieve the template arguments 695 TemplateArgumentLoc *getTemplateArgs() { 696 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 697 } 698 699 /// \brief Retrieve the template arguments 700 const TemplateArgumentLoc *getTemplateArgs() const { 701 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 702 } 703 704 void initializeFrom(const TemplateArgumentListInfo &List); 705 void initializeFrom(const TemplateArgumentListInfo &List, 706 bool &Dependent, bool &InstantiationDependent, 707 bool &ContainsUnexpandedParameterPack); 708 void copyInto(TemplateArgumentListInfo &List) const; 709 static std::size_t sizeFor(unsigned NumTemplateArgs); 710 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 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 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 791 D(D), Loc(L) { 792 DeclRefExprBits.HasQualifier = 0; 793 DeclRefExprBits.HasExplicitTemplateArgs = 0; 794 DeclRefExprBits.HasFoundDecl = 0; 795 computeDependence(); 796 } 797 798 static DeclRefExpr *Create(ASTContext &Context, 799 NestedNameSpecifierLoc QualifierLoc, 800 ValueDecl *D, 801 SourceLocation NameLoc, 802 QualType T, ExprValueKind VK, 803 NamedDecl *FoundD = 0, 804 const TemplateArgumentListInfo *TemplateArgs = 0); 805 806 static DeclRefExpr *Create(ASTContext &Context, 807 NestedNameSpecifierLoc QualifierLoc, 808 ValueDecl *D, 809 const DeclarationNameInfo &NameInfo, 810 QualType T, ExprValueKind VK, 811 NamedDecl *FoundD = 0, 812 const TemplateArgumentListInfo *TemplateArgs = 0); 813 814 /// \brief Construct an empty declaration reference expression. 815 static DeclRefExpr *CreateEmpty(ASTContext &Context, 816 bool HasQualifier, 817 bool HasFoundDecl, 818 bool HasExplicitTemplateArgs, 819 unsigned NumTemplateArgs); 820 821 ValueDecl *getDecl() { return D; } 822 const ValueDecl *getDecl() const { return D; } 823 void setDecl(ValueDecl *NewD) { D = NewD; } 824 825 DeclarationNameInfo getNameInfo() const { 826 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 827 } 828 829 SourceLocation getLocation() const { return Loc; } 830 void setLocation(SourceLocation L) { Loc = L; } 831 SourceRange getSourceRange() const; 832 833 /// \brief Determine whether this declaration reference was preceded by a 834 /// C++ nested-name-specifier, e.g., \c N::foo. 835 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 836 837 /// \brief If the name was qualified, retrieves the nested-name-specifier 838 /// that precedes the name. Otherwise, returns NULL. 839 NestedNameSpecifier *getQualifier() const { 840 if (!hasQualifier()) 841 return 0; 842 843 return getInternalQualifierLoc().getNestedNameSpecifier(); 844 } 845 846 /// \brief If the name was qualified, retrieves the nested-name-specifier 847 /// that precedes the name, with source-location information. 848 NestedNameSpecifierLoc getQualifierLoc() const { 849 if (!hasQualifier()) 850 return NestedNameSpecifierLoc(); 851 852 return getInternalQualifierLoc(); 853 } 854 855 /// \brief Get the NamedDecl through which this reference occured. 856 /// 857 /// This Decl may be different from the ValueDecl actually referred to in the 858 /// presence of using declarations, etc. It always returns non-NULL, and may 859 /// simple return the ValueDecl when appropriate. 860 NamedDecl *getFoundDecl() { 861 return hasFoundDecl() ? getInternalFoundDecl() : D; 862 } 863 864 /// \brief Get the NamedDecl through which this reference occurred. 865 /// See non-const variant. 866 const NamedDecl *getFoundDecl() const { 867 return hasFoundDecl() ? getInternalFoundDecl() : D; 868 } 869 870 /// \brief Determines whether this declaration reference was followed by an 871 /// explict template argument list. 872 bool hasExplicitTemplateArgs() const { 873 return DeclRefExprBits.HasExplicitTemplateArgs; 874 } 875 876 /// \brief Retrieve the explicit template argument list that followed the 877 /// member template name. 878 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 879 assert(hasExplicitTemplateArgs()); 880 if (hasFoundDecl()) 881 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 882 &getInternalFoundDecl() + 1); 883 884 if (hasQualifier()) 885 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 886 &getInternalQualifierLoc() + 1); 887 888 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 889 } 890 891 /// \brief Retrieve the explicit template argument list that followed the 892 /// member template name. 893 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 894 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 895 } 896 897 /// \brief Retrieves the optional explicit template arguments. 898 /// This points to the same data as getExplicitTemplateArgs(), but 899 /// returns null if there are no explicit template arguments. 900 const ExplicitTemplateArgumentList *getExplicitTemplateArgsOpt() const { 901 if (!hasExplicitTemplateArgs()) return 0; 902 return &getExplicitTemplateArgs(); 903 } 904 905 /// \brief Copies the template arguments (if present) into the given 906 /// structure. 907 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 908 if (hasExplicitTemplateArgs()) 909 getExplicitTemplateArgs().copyInto(List); 910 } 911 912 /// \brief Retrieve the location of the left angle bracket following the 913 /// member name ('<'), if any. 914 SourceLocation getLAngleLoc() const { 915 if (!hasExplicitTemplateArgs()) 916 return SourceLocation(); 917 918 return getExplicitTemplateArgs().LAngleLoc; 919 } 920 921 /// \brief Retrieve the template arguments provided as part of this 922 /// template-id. 923 const TemplateArgumentLoc *getTemplateArgs() const { 924 if (!hasExplicitTemplateArgs()) 925 return 0; 926 927 return getExplicitTemplateArgs().getTemplateArgs(); 928 } 929 930 /// \brief Retrieve the number of template arguments provided as part of this 931 /// template-id. 932 unsigned getNumTemplateArgs() const { 933 if (!hasExplicitTemplateArgs()) 934 return 0; 935 936 return getExplicitTemplateArgs().NumTemplateArgs; 937 } 938 939 /// \brief Retrieve the location of the right angle bracket following the 940 /// template arguments ('>'). 941 SourceLocation getRAngleLoc() const { 942 if (!hasExplicitTemplateArgs()) 943 return SourceLocation(); 944 945 return getExplicitTemplateArgs().RAngleLoc; 946 } 947 948 static bool classof(const Stmt *T) { 949 return T->getStmtClass() == DeclRefExprClass; 950 } 951 static bool classof(const DeclRefExpr *) { return true; } 952 953 // Iterators 954 child_range children() { return child_range(); } 955 956 friend class ASTStmtReader; 957 friend class ASTStmtWriter; 958}; 959 960/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 961class PredefinedExpr : public Expr { 962public: 963 enum IdentType { 964 Func, 965 Function, 966 PrettyFunction, 967 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 968 /// 'virtual' keyword is omitted for virtual member functions. 969 PrettyFunctionNoVirtual 970 }; 971 972private: 973 SourceLocation Loc; 974 IdentType Type; 975public: 976 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 977 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 978 type->isDependentType(), type->isDependentType(), 979 type->isInstantiationDependentType(), 980 /*ContainsUnexpandedParameterPack=*/false), 981 Loc(l), Type(IT) {} 982 983 /// \brief Construct an empty predefined expression. 984 explicit PredefinedExpr(EmptyShell Empty) 985 : Expr(PredefinedExprClass, Empty) { } 986 987 IdentType getIdentType() const { return Type; } 988 void setIdentType(IdentType IT) { Type = IT; } 989 990 SourceLocation getLocation() const { return Loc; } 991 void setLocation(SourceLocation L) { Loc = L; } 992 993 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 994 995 SourceRange getSourceRange() const { return SourceRange(Loc); } 996 997 static bool classof(const Stmt *T) { 998 return T->getStmtClass() == PredefinedExprClass; 999 } 1000 static bool classof(const PredefinedExpr *) { return true; } 1001 1002 // Iterators 1003 child_range children() { return child_range(); } 1004}; 1005 1006/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1007/// leaking memory. 1008/// 1009/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1010/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1011/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1012/// the APFloat/APInt values will never get freed. APNumericStorage uses 1013/// ASTContext's allocator for memory allocation. 1014class APNumericStorage { 1015 unsigned BitWidth; 1016 union { 1017 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1018 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1019 }; 1020 1021 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1022 1023 APNumericStorage(const APNumericStorage&); // do not implement 1024 APNumericStorage& operator=(const APNumericStorage&); // do not implement 1025 1026protected: 1027 APNumericStorage() : BitWidth(0), VAL(0) { } 1028 1029 llvm::APInt getIntValue() const { 1030 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1031 if (NumWords > 1) 1032 return llvm::APInt(BitWidth, NumWords, pVal); 1033 else 1034 return llvm::APInt(BitWidth, VAL); 1035 } 1036 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1037}; 1038 1039class APIntStorage : public APNumericStorage { 1040public: 1041 llvm::APInt getValue() const { return getIntValue(); } 1042 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1043}; 1044 1045class APFloatStorage : public APNumericStorage { 1046public: 1047 llvm::APFloat getValue() const { return llvm::APFloat(getIntValue()); } 1048 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1049 setIntValue(C, Val.bitcastToAPInt()); 1050 } 1051}; 1052 1053class IntegerLiteral : public Expr { 1054 APIntStorage Num; 1055 SourceLocation Loc; 1056 1057 /// \brief Construct an empty integer literal. 1058 explicit IntegerLiteral(EmptyShell Empty) 1059 : Expr(IntegerLiteralClass, Empty) { } 1060 1061public: 1062 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1063 // or UnsignedLongLongTy 1064 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 1065 QualType type, SourceLocation l) 1066 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1067 false, false), 1068 Loc(l) { 1069 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 1070 assert(V.getBitWidth() == C.getIntWidth(type) && 1071 "Integer type is not the correct size for constant."); 1072 setValue(C, V); 1073 } 1074 1075 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1076 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1077 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1078 /// \param V - the value that the returned integer literal contains. 1079 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1080 QualType type, SourceLocation l); 1081 /// \brief Returns a new empty integer literal. 1082 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1083 1084 llvm::APInt getValue() const { return Num.getValue(); } 1085 SourceRange getSourceRange() const { return SourceRange(Loc); } 1086 1087 /// \brief Retrieve the location of the literal. 1088 SourceLocation getLocation() const { return Loc; } 1089 1090 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 1091 void setLocation(SourceLocation Location) { Loc = Location; } 1092 1093 static bool classof(const Stmt *T) { 1094 return T->getStmtClass() == IntegerLiteralClass; 1095 } 1096 static bool classof(const IntegerLiteral *) { return true; } 1097 1098 // Iterators 1099 child_range children() { return child_range(); } 1100}; 1101 1102class CharacterLiteral : public Expr { 1103 unsigned Value; 1104 SourceLocation Loc; 1105 bool IsWide; 1106public: 1107 // type should be IntTy 1108 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 1109 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1110 false, false), 1111 Value(value), Loc(l), IsWide(iswide) { 1112 } 1113 1114 /// \brief Construct an empty character literal. 1115 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1116 1117 SourceLocation getLocation() const { return Loc; } 1118 bool isWide() const { return IsWide; } 1119 1120 SourceRange getSourceRange() const { return SourceRange(Loc); } 1121 1122 unsigned getValue() const { return Value; } 1123 1124 void setLocation(SourceLocation Location) { Loc = Location; } 1125 void setWide(bool W) { IsWide = W; } 1126 void setValue(unsigned Val) { Value = Val; } 1127 1128 static bool classof(const Stmt *T) { 1129 return T->getStmtClass() == CharacterLiteralClass; 1130 } 1131 static bool classof(const CharacterLiteral *) { return true; } 1132 1133 // Iterators 1134 child_range children() { return child_range(); } 1135}; 1136 1137class FloatingLiteral : public Expr { 1138 APFloatStorage Num; 1139 bool IsExact : 1; 1140 SourceLocation Loc; 1141 1142 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1143 QualType Type, SourceLocation L) 1144 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1145 false, false), 1146 IsExact(isexact), Loc(L) { 1147 setValue(C, V); 1148 } 1149 1150 /// \brief Construct an empty floating-point literal. 1151 explicit FloatingLiteral(EmptyShell Empty) 1152 : Expr(FloatingLiteralClass, Empty), IsExact(false) { } 1153 1154public: 1155 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1156 bool isexact, QualType Type, SourceLocation L); 1157 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1158 1159 llvm::APFloat getValue() const { return Num.getValue(); } 1160 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1161 Num.setValue(C, Val); 1162 } 1163 1164 bool isExact() const { return IsExact; } 1165 void setExact(bool E) { IsExact = E; } 1166 1167 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1168 /// double. Note that this may cause loss of precision, but is useful for 1169 /// debugging dumps, etc. 1170 double getValueAsApproximateDouble() const; 1171 1172 SourceLocation getLocation() const { return Loc; } 1173 void setLocation(SourceLocation L) { Loc = L; } 1174 1175 SourceRange getSourceRange() const { return SourceRange(Loc); } 1176 1177 static bool classof(const Stmt *T) { 1178 return T->getStmtClass() == FloatingLiteralClass; 1179 } 1180 static bool classof(const FloatingLiteral *) { return true; } 1181 1182 // Iterators 1183 child_range children() { return child_range(); } 1184}; 1185 1186/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1187/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1188/// IntegerLiteral classes. Instances of this class always have a Complex type 1189/// whose element type matches the subexpression. 1190/// 1191class ImaginaryLiteral : public Expr { 1192 Stmt *Val; 1193public: 1194 ImaginaryLiteral(Expr *val, QualType Ty) 1195 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1196 false, false), 1197 Val(val) {} 1198 1199 /// \brief Build an empty imaginary literal. 1200 explicit ImaginaryLiteral(EmptyShell Empty) 1201 : Expr(ImaginaryLiteralClass, Empty) { } 1202 1203 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1204 Expr *getSubExpr() { return cast<Expr>(Val); } 1205 void setSubExpr(Expr *E) { Val = E; } 1206 1207 SourceRange getSourceRange() const { return Val->getSourceRange(); } 1208 static bool classof(const Stmt *T) { 1209 return T->getStmtClass() == ImaginaryLiteralClass; 1210 } 1211 static bool classof(const ImaginaryLiteral *) { return true; } 1212 1213 // Iterators 1214 child_range children() { return child_range(&Val, &Val+1); } 1215}; 1216 1217/// StringLiteral - This represents a string literal expression, e.g. "foo" 1218/// or L"bar" (wide strings). The actual string is returned by getStrData() 1219/// is NOT null-terminated, and the length of the string is determined by 1220/// calling getByteLength(). The C type for a string is always a 1221/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1222/// not. 1223/// 1224/// Note that strings in C can be formed by concatenation of multiple string 1225/// literal pptokens in translation phase #6. This keeps track of the locations 1226/// of each of these pieces. 1227/// 1228/// Strings in C can also be truncated and extended by assigning into arrays, 1229/// e.g. with constructs like: 1230/// char X[2] = "foobar"; 1231/// In this case, getByteLength() will return 6, but the string literal will 1232/// have type "char[2]". 1233class StringLiteral : public Expr { 1234 friend class ASTStmtReader; 1235 1236 const char *StrData; 1237 unsigned ByteLength; 1238 bool IsWide; 1239 bool IsPascal; 1240 unsigned NumConcatenated; 1241 SourceLocation TokLocs[1]; 1242 1243 StringLiteral(QualType Ty) : 1244 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1245 false) {} 1246 1247public: 1248 /// This is the "fully general" constructor that allows representation of 1249 /// strings formed from multiple concatenated tokens. 1250 static StringLiteral *Create(ASTContext &C, llvm::StringRef Str, bool Wide, 1251 bool Pascal, QualType Ty, 1252 const SourceLocation *Loc, unsigned NumStrs); 1253 1254 /// Simple constructor for string literals made from one token. 1255 static StringLiteral *Create(ASTContext &C, llvm::StringRef Str, bool Wide, 1256 bool Pascal, QualType Ty, SourceLocation Loc) { 1257 return Create(C, Str, Wide, Pascal, Ty, &Loc, 1); 1258 } 1259 1260 /// \brief Construct an empty string literal. 1261 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1262 1263 llvm::StringRef getString() const { 1264 return llvm::StringRef(StrData, ByteLength); 1265 } 1266 1267 unsigned getByteLength() const { return ByteLength; } 1268 1269 /// \brief Sets the string data to the given string data. 1270 void setString(ASTContext &C, llvm::StringRef Str); 1271 1272 bool isWide() const { return IsWide; } 1273 bool isPascal() const { return IsPascal; } 1274 1275 bool containsNonAsciiOrNull() const { 1276 llvm::StringRef Str = getString(); 1277 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1278 if (!isascii(Str[i]) || !Str[i]) 1279 return true; 1280 return false; 1281 } 1282 /// getNumConcatenated - Get the number of string literal tokens that were 1283 /// concatenated in translation phase #6 to form this string literal. 1284 unsigned getNumConcatenated() const { return NumConcatenated; } 1285 1286 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1287 assert(TokNum < NumConcatenated && "Invalid tok number"); 1288 return TokLocs[TokNum]; 1289 } 1290 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1291 assert(TokNum < NumConcatenated && "Invalid tok number"); 1292 TokLocs[TokNum] = L; 1293 } 1294 1295 /// getLocationOfByte - Return a source location that points to the specified 1296 /// byte of this string literal. 1297 /// 1298 /// Strings are amazingly complex. They can be formed from multiple tokens 1299 /// and can have escape sequences in them in addition to the usual trigraph 1300 /// and escaped newline business. This routine handles this complexity. 1301 /// 1302 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1303 const LangOptions &Features, 1304 const TargetInfo &Target) const; 1305 1306 typedef const SourceLocation *tokloc_iterator; 1307 tokloc_iterator tokloc_begin() const { return TokLocs; } 1308 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1309 1310 SourceRange getSourceRange() const { 1311 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1312 } 1313 static bool classof(const Stmt *T) { 1314 return T->getStmtClass() == StringLiteralClass; 1315 } 1316 static bool classof(const StringLiteral *) { return true; } 1317 1318 // Iterators 1319 child_range children() { return child_range(); } 1320}; 1321 1322/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1323/// AST node is only formed if full location information is requested. 1324class ParenExpr : public Expr { 1325 SourceLocation L, R; 1326 Stmt *Val; 1327public: 1328 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1329 : Expr(ParenExprClass, val->getType(), 1330 val->getValueKind(), val->getObjectKind(), 1331 val->isTypeDependent(), val->isValueDependent(), 1332 val->isInstantiationDependent(), 1333 val->containsUnexpandedParameterPack()), 1334 L(l), R(r), Val(val) {} 1335 1336 /// \brief Construct an empty parenthesized expression. 1337 explicit ParenExpr(EmptyShell Empty) 1338 : Expr(ParenExprClass, Empty) { } 1339 1340 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1341 Expr *getSubExpr() { return cast<Expr>(Val); } 1342 void setSubExpr(Expr *E) { Val = E; } 1343 1344 SourceRange getSourceRange() const { return SourceRange(L, R); } 1345 1346 /// \brief Get the location of the left parentheses '('. 1347 SourceLocation getLParen() const { return L; } 1348 void setLParen(SourceLocation Loc) { L = Loc; } 1349 1350 /// \brief Get the location of the right parentheses ')'. 1351 SourceLocation getRParen() const { return R; } 1352 void setRParen(SourceLocation Loc) { R = Loc; } 1353 1354 static bool classof(const Stmt *T) { 1355 return T->getStmtClass() == ParenExprClass; 1356 } 1357 static bool classof(const ParenExpr *) { return true; } 1358 1359 // Iterators 1360 child_range children() { return child_range(&Val, &Val+1); } 1361}; 1362 1363 1364/// UnaryOperator - This represents the unary-expression's (except sizeof and 1365/// alignof), the postinc/postdec operators from postfix-expression, and various 1366/// extensions. 1367/// 1368/// Notes on various nodes: 1369/// 1370/// Real/Imag - These return the real/imag part of a complex operand. If 1371/// applied to a non-complex value, the former returns its operand and the 1372/// later returns zero in the type of the operand. 1373/// 1374class UnaryOperator : public Expr { 1375public: 1376 typedef UnaryOperatorKind Opcode; 1377 1378private: 1379 unsigned Opc : 5; 1380 SourceLocation Loc; 1381 Stmt *Val; 1382public: 1383 1384 UnaryOperator(Expr *input, Opcode opc, QualType type, 1385 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1386 : Expr(UnaryOperatorClass, type, VK, OK, 1387 input->isTypeDependent() || type->isDependentType(), 1388 input->isValueDependent(), 1389 (input->isInstantiationDependent() || 1390 type->isInstantiationDependentType()), 1391 input->containsUnexpandedParameterPack()), 1392 Opc(opc), Loc(l), Val(input) {} 1393 1394 /// \brief Build an empty unary operator. 1395 explicit UnaryOperator(EmptyShell Empty) 1396 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1397 1398 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1399 void setOpcode(Opcode O) { Opc = O; } 1400 1401 Expr *getSubExpr() const { return cast<Expr>(Val); } 1402 void setSubExpr(Expr *E) { Val = E; } 1403 1404 /// getOperatorLoc - Return the location of the operator. 1405 SourceLocation getOperatorLoc() const { return Loc; } 1406 void setOperatorLoc(SourceLocation L) { Loc = L; } 1407 1408 /// isPostfix - Return true if this is a postfix operation, like x++. 1409 static bool isPostfix(Opcode Op) { 1410 return Op == UO_PostInc || Op == UO_PostDec; 1411 } 1412 1413 /// isPrefix - Return true if this is a prefix operation, like --x. 1414 static bool isPrefix(Opcode Op) { 1415 return Op == UO_PreInc || Op == UO_PreDec; 1416 } 1417 1418 bool isPrefix() const { return isPrefix(getOpcode()); } 1419 bool isPostfix() const { return isPostfix(getOpcode()); } 1420 bool isIncrementOp() const { 1421 return Opc == UO_PreInc || Opc == UO_PostInc; 1422 } 1423 bool isIncrementDecrementOp() const { 1424 return Opc <= UO_PreDec; 1425 } 1426 static bool isArithmeticOp(Opcode Op) { 1427 return Op >= UO_Plus && Op <= UO_LNot; 1428 } 1429 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1430 1431 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1432 /// corresponds to, e.g. "sizeof" or "[pre]++" 1433 static const char *getOpcodeStr(Opcode Op); 1434 1435 /// \brief Retrieve the unary opcode that corresponds to the given 1436 /// overloaded operator. 1437 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1438 1439 /// \brief Retrieve the overloaded operator kind that corresponds to 1440 /// the given unary opcode. 1441 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1442 1443 SourceRange getSourceRange() const { 1444 if (isPostfix()) 1445 return SourceRange(Val->getLocStart(), Loc); 1446 else 1447 return SourceRange(Loc, Val->getLocEnd()); 1448 } 1449 SourceLocation getExprLoc() const { return Loc; } 1450 1451 static bool classof(const Stmt *T) { 1452 return T->getStmtClass() == UnaryOperatorClass; 1453 } 1454 static bool classof(const UnaryOperator *) { return true; } 1455 1456 // Iterators 1457 child_range children() { return child_range(&Val, &Val+1); } 1458}; 1459 1460/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1461/// offsetof(record-type, member-designator). For example, given: 1462/// @code 1463/// struct S { 1464/// float f; 1465/// double d; 1466/// }; 1467/// struct T { 1468/// int i; 1469/// struct S s[10]; 1470/// }; 1471/// @endcode 1472/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1473 1474class OffsetOfExpr : public Expr { 1475public: 1476 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1477 class OffsetOfNode { 1478 public: 1479 /// \brief The kind of offsetof node we have. 1480 enum Kind { 1481 /// \brief An index into an array. 1482 Array = 0x00, 1483 /// \brief A field. 1484 Field = 0x01, 1485 /// \brief A field in a dependent type, known only by its name. 1486 Identifier = 0x02, 1487 /// \brief An implicit indirection through a C++ base class, when the 1488 /// field found is in a base class. 1489 Base = 0x03 1490 }; 1491 1492 private: 1493 enum { MaskBits = 2, Mask = 0x03 }; 1494 1495 /// \brief The source range that covers this part of the designator. 1496 SourceRange Range; 1497 1498 /// \brief The data describing the designator, which comes in three 1499 /// different forms, depending on the lower two bits. 1500 /// - An unsigned index into the array of Expr*'s stored after this node 1501 /// in memory, for [constant-expression] designators. 1502 /// - A FieldDecl*, for references to a known field. 1503 /// - An IdentifierInfo*, for references to a field with a given name 1504 /// when the class type is dependent. 1505 /// - A CXXBaseSpecifier*, for references that look at a field in a 1506 /// base class. 1507 uintptr_t Data; 1508 1509 public: 1510 /// \brief Create an offsetof node that refers to an array element. 1511 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1512 SourceLocation RBracketLoc) 1513 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1514 1515 /// \brief Create an offsetof node that refers to a field. 1516 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1517 SourceLocation NameLoc) 1518 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1519 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1520 1521 /// \brief Create an offsetof node that refers to an identifier. 1522 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1523 SourceLocation NameLoc) 1524 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1525 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1526 1527 /// \brief Create an offsetof node that refers into a C++ base class. 1528 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1529 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1530 1531 /// \brief Determine what kind of offsetof node this is. 1532 Kind getKind() const { 1533 return static_cast<Kind>(Data & Mask); 1534 } 1535 1536 /// \brief For an array element node, returns the index into the array 1537 /// of expressions. 1538 unsigned getArrayExprIndex() const { 1539 assert(getKind() == Array); 1540 return Data >> 2; 1541 } 1542 1543 /// \brief For a field offsetof node, returns the field. 1544 FieldDecl *getField() const { 1545 assert(getKind() == Field); 1546 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1547 } 1548 1549 /// \brief For a field or identifier offsetof node, returns the name of 1550 /// the field. 1551 IdentifierInfo *getFieldName() const; 1552 1553 /// \brief For a base class node, returns the base specifier. 1554 CXXBaseSpecifier *getBase() const { 1555 assert(getKind() == Base); 1556 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1557 } 1558 1559 /// \brief Retrieve the source range that covers this offsetof node. 1560 /// 1561 /// For an array element node, the source range contains the locations of 1562 /// the square brackets. For a field or identifier node, the source range 1563 /// contains the location of the period (if there is one) and the 1564 /// identifier. 1565 SourceRange getSourceRange() const { return Range; } 1566 }; 1567 1568private: 1569 1570 SourceLocation OperatorLoc, RParenLoc; 1571 // Base type; 1572 TypeSourceInfo *TSInfo; 1573 // Number of sub-components (i.e. instances of OffsetOfNode). 1574 unsigned NumComps; 1575 // Number of sub-expressions (i.e. array subscript expressions). 1576 unsigned NumExprs; 1577 1578 OffsetOfExpr(ASTContext &C, QualType type, 1579 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1580 OffsetOfNode* compsPtr, unsigned numComps, 1581 Expr** exprsPtr, unsigned numExprs, 1582 SourceLocation RParenLoc); 1583 1584 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1585 : Expr(OffsetOfExprClass, EmptyShell()), 1586 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1587 1588public: 1589 1590 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1591 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1592 OffsetOfNode* compsPtr, unsigned numComps, 1593 Expr** exprsPtr, unsigned numExprs, 1594 SourceLocation RParenLoc); 1595 1596 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1597 unsigned NumComps, unsigned NumExprs); 1598 1599 /// getOperatorLoc - Return the location of the operator. 1600 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1601 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1602 1603 /// \brief Return the location of the right parentheses. 1604 SourceLocation getRParenLoc() const { return RParenLoc; } 1605 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1606 1607 TypeSourceInfo *getTypeSourceInfo() const { 1608 return TSInfo; 1609 } 1610 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1611 TSInfo = tsi; 1612 } 1613 1614 const OffsetOfNode &getComponent(unsigned Idx) const { 1615 assert(Idx < NumComps && "Subscript out of range"); 1616 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1617 } 1618 1619 void setComponent(unsigned Idx, OffsetOfNode ON) { 1620 assert(Idx < NumComps && "Subscript out of range"); 1621 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1622 } 1623 1624 unsigned getNumComponents() const { 1625 return NumComps; 1626 } 1627 1628 Expr* getIndexExpr(unsigned Idx) { 1629 assert(Idx < NumExprs && "Subscript out of range"); 1630 return reinterpret_cast<Expr **>( 1631 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1632 } 1633 const Expr *getIndexExpr(unsigned Idx) const { 1634 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1635 } 1636 1637 void setIndexExpr(unsigned Idx, Expr* E) { 1638 assert(Idx < NumComps && "Subscript out of range"); 1639 reinterpret_cast<Expr **>( 1640 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1641 } 1642 1643 unsigned getNumExpressions() const { 1644 return NumExprs; 1645 } 1646 1647 SourceRange getSourceRange() const { 1648 return SourceRange(OperatorLoc, RParenLoc); 1649 } 1650 1651 static bool classof(const Stmt *T) { 1652 return T->getStmtClass() == OffsetOfExprClass; 1653 } 1654 1655 static bool classof(const OffsetOfExpr *) { return true; } 1656 1657 // Iterators 1658 child_range children() { 1659 Stmt **begin = 1660 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1661 + NumComps); 1662 return child_range(begin, begin + NumExprs); 1663 } 1664}; 1665 1666/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1667/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1668/// vec_step (OpenCL 1.1 6.11.12). 1669class UnaryExprOrTypeTraitExpr : public Expr { 1670 unsigned Kind : 2; 1671 bool isType : 1; // true if operand is a type, false if an expression 1672 union { 1673 TypeSourceInfo *Ty; 1674 Stmt *Ex; 1675 } Argument; 1676 SourceLocation OpLoc, RParenLoc; 1677 1678public: 1679 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1680 QualType resultType, SourceLocation op, 1681 SourceLocation rp) : 1682 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1683 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1684 // Value-dependent if the argument is type-dependent. 1685 TInfo->getType()->isDependentType(), 1686 TInfo->getType()->isInstantiationDependentType(), 1687 TInfo->getType()->containsUnexpandedParameterPack()), 1688 Kind(ExprKind), isType(true), OpLoc(op), RParenLoc(rp) { 1689 Argument.Ty = TInfo; 1690 } 1691 1692 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1693 QualType resultType, SourceLocation op, 1694 SourceLocation rp) : 1695 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1696 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1697 // Value-dependent if the argument is type-dependent. 1698 E->isTypeDependent(), 1699 E->isInstantiationDependent(), 1700 E->containsUnexpandedParameterPack()), 1701 Kind(ExprKind), isType(false), OpLoc(op), RParenLoc(rp) { 1702 Argument.Ex = E; 1703 } 1704 1705 /// \brief Construct an empty sizeof/alignof expression. 1706 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1707 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1708 1709 UnaryExprOrTypeTrait getKind() const { 1710 return static_cast<UnaryExprOrTypeTrait>(Kind); 1711 } 1712 void setKind(UnaryExprOrTypeTrait K) { Kind = K; } 1713 1714 bool isArgumentType() const { return isType; } 1715 QualType getArgumentType() const { 1716 return getArgumentTypeInfo()->getType(); 1717 } 1718 TypeSourceInfo *getArgumentTypeInfo() const { 1719 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1720 return Argument.Ty; 1721 } 1722 Expr *getArgumentExpr() { 1723 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1724 return static_cast<Expr*>(Argument.Ex); 1725 } 1726 const Expr *getArgumentExpr() const { 1727 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1728 } 1729 1730 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1731 void setArgument(TypeSourceInfo *TInfo) { 1732 Argument.Ty = TInfo; 1733 isType = true; 1734 } 1735 1736 /// Gets the argument type, or the type of the argument expression, whichever 1737 /// is appropriate. 1738 QualType getTypeOfArgument() const { 1739 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1740 } 1741 1742 SourceLocation getOperatorLoc() const { return OpLoc; } 1743 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1744 1745 SourceLocation getRParenLoc() const { return RParenLoc; } 1746 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1747 1748 SourceRange getSourceRange() const { 1749 return SourceRange(OpLoc, RParenLoc); 1750 } 1751 1752 static bool classof(const Stmt *T) { 1753 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1754 } 1755 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1756 1757 // Iterators 1758 child_range children(); 1759}; 1760 1761//===----------------------------------------------------------------------===// 1762// Postfix Operators. 1763//===----------------------------------------------------------------------===// 1764 1765/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1766class ArraySubscriptExpr : public Expr { 1767 enum { LHS, RHS, END_EXPR=2 }; 1768 Stmt* SubExprs[END_EXPR]; 1769 SourceLocation RBracketLoc; 1770public: 1771 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1772 ExprValueKind VK, ExprObjectKind OK, 1773 SourceLocation rbracketloc) 1774 : Expr(ArraySubscriptExprClass, t, VK, OK, 1775 lhs->isTypeDependent() || rhs->isTypeDependent(), 1776 lhs->isValueDependent() || rhs->isValueDependent(), 1777 (lhs->isInstantiationDependent() || 1778 rhs->isInstantiationDependent()), 1779 (lhs->containsUnexpandedParameterPack() || 1780 rhs->containsUnexpandedParameterPack())), 1781 RBracketLoc(rbracketloc) { 1782 SubExprs[LHS] = lhs; 1783 SubExprs[RHS] = rhs; 1784 } 1785 1786 /// \brief Create an empty array subscript expression. 1787 explicit ArraySubscriptExpr(EmptyShell Shell) 1788 : Expr(ArraySubscriptExprClass, Shell) { } 1789 1790 /// An array access can be written A[4] or 4[A] (both are equivalent). 1791 /// - getBase() and getIdx() always present the normalized view: A[4]. 1792 /// In this case getBase() returns "A" and getIdx() returns "4". 1793 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1794 /// 4[A] getLHS() returns "4". 1795 /// Note: Because vector element access is also written A[4] we must 1796 /// predicate the format conversion in getBase and getIdx only on the 1797 /// the type of the RHS, as it is possible for the LHS to be a vector of 1798 /// integer type 1799 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1800 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1801 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1802 1803 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1804 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1805 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1806 1807 Expr *getBase() { 1808 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1809 } 1810 1811 const Expr *getBase() const { 1812 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1813 } 1814 1815 Expr *getIdx() { 1816 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1817 } 1818 1819 const Expr *getIdx() const { 1820 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1821 } 1822 1823 SourceRange getSourceRange() const { 1824 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1825 } 1826 1827 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1828 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1829 1830 SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1831 1832 static bool classof(const Stmt *T) { 1833 return T->getStmtClass() == ArraySubscriptExprClass; 1834 } 1835 static bool classof(const ArraySubscriptExpr *) { return true; } 1836 1837 // Iterators 1838 child_range children() { 1839 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 1840 } 1841}; 1842 1843 1844/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1845/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1846/// while its subclasses may represent alternative syntax that (semantically) 1847/// results in a function call. For example, CXXOperatorCallExpr is 1848/// a subclass for overloaded operator calls that use operator syntax, e.g., 1849/// "str1 + str2" to resolve to a function call. 1850class CallExpr : public Expr { 1851 enum { FN=0, PREARGS_START=1 }; 1852 Stmt **SubExprs; 1853 unsigned NumArgs; 1854 SourceLocation RParenLoc; 1855 1856protected: 1857 // These versions of the constructor are for derived classes. 1858 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 1859 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 1860 SourceLocation rparenloc); 1861 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 1862 1863 Stmt *getPreArg(unsigned i) { 1864 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1865 return SubExprs[PREARGS_START+i]; 1866 } 1867 const Stmt *getPreArg(unsigned i) const { 1868 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1869 return SubExprs[PREARGS_START+i]; 1870 } 1871 void setPreArg(unsigned i, Stmt *PreArg) { 1872 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1873 SubExprs[PREARGS_START+i] = PreArg; 1874 } 1875 1876 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 1877 1878public: 1879 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1880 ExprValueKind VK, SourceLocation rparenloc); 1881 1882 /// \brief Build an empty call expression. 1883 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1884 1885 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1886 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1887 void setCallee(Expr *F) { SubExprs[FN] = F; } 1888 1889 Decl *getCalleeDecl(); 1890 const Decl *getCalleeDecl() const { 1891 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1892 } 1893 1894 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1895 FunctionDecl *getDirectCallee(); 1896 const FunctionDecl *getDirectCallee() const { 1897 return const_cast<CallExpr*>(this)->getDirectCallee(); 1898 } 1899 1900 /// getNumArgs - Return the number of actual arguments to this call. 1901 /// 1902 unsigned getNumArgs() const { return NumArgs; } 1903 1904 /// \brief Retrieve the call arguments. 1905 Expr **getArgs() { 1906 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 1907 } 1908 1909 /// getArg - Return the specified argument. 1910 Expr *getArg(unsigned Arg) { 1911 assert(Arg < NumArgs && "Arg access out of range!"); 1912 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1913 } 1914 const Expr *getArg(unsigned Arg) const { 1915 assert(Arg < NumArgs && "Arg access out of range!"); 1916 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1917 } 1918 1919 /// setArg - Set the specified argument. 1920 void setArg(unsigned Arg, Expr *ArgExpr) { 1921 assert(Arg < NumArgs && "Arg access out of range!"); 1922 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 1923 } 1924 1925 /// setNumArgs - This changes the number of arguments present in this call. 1926 /// Any orphaned expressions are deleted by this, and any new operands are set 1927 /// to null. 1928 void setNumArgs(ASTContext& C, unsigned NumArgs); 1929 1930 typedef ExprIterator arg_iterator; 1931 typedef ConstExprIterator const_arg_iterator; 1932 1933 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 1934 arg_iterator arg_end() { 1935 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1936 } 1937 const_arg_iterator arg_begin() const { 1938 return SubExprs+PREARGS_START+getNumPreArgs(); 1939 } 1940 const_arg_iterator arg_end() const { 1941 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1942 } 1943 1944 /// getNumCommas - Return the number of commas that must have been present in 1945 /// this function call. 1946 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1947 1948 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1949 /// not, return 0. 1950 unsigned isBuiltinCall(const ASTContext &Context) const; 1951 1952 /// getCallReturnType - Get the return type of the call expr. This is not 1953 /// always the type of the expr itself, if the return type is a reference 1954 /// type. 1955 QualType getCallReturnType() const; 1956 1957 SourceLocation getRParenLoc() const { return RParenLoc; } 1958 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1959 1960 SourceRange getSourceRange() const; 1961 1962 static bool classof(const Stmt *T) { 1963 return T->getStmtClass() >= firstCallExprConstant && 1964 T->getStmtClass() <= lastCallExprConstant; 1965 } 1966 static bool classof(const CallExpr *) { return true; } 1967 1968 // Iterators 1969 child_range children() { 1970 return child_range(&SubExprs[0], 1971 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 1972 } 1973}; 1974 1975/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1976/// 1977class MemberExpr : public Expr { 1978 /// Extra data stored in some member expressions. 1979 struct MemberNameQualifier { 1980 /// \brief The nested-name-specifier that qualifies the name, including 1981 /// source-location information. 1982 NestedNameSpecifierLoc QualifierLoc; 1983 1984 /// \brief The DeclAccessPair through which the MemberDecl was found due to 1985 /// name qualifiers. 1986 DeclAccessPair FoundDecl; 1987 }; 1988 1989 /// Base - the expression for the base pointer or structure references. In 1990 /// X.F, this is "X". 1991 Stmt *Base; 1992 1993 /// MemberDecl - This is the decl being referenced by the field/member name. 1994 /// In X.F, this is the decl referenced by F. 1995 ValueDecl *MemberDecl; 1996 1997 /// MemberLoc - This is the location of the member name. 1998 SourceLocation MemberLoc; 1999 2000 /// MemberDNLoc - Provides source/type location info for the 2001 /// declaration name embedded in MemberDecl. 2002 DeclarationNameLoc MemberDNLoc; 2003 2004 /// IsArrow - True if this is "X->F", false if this is "X.F". 2005 bool IsArrow : 1; 2006 2007 /// \brief True if this member expression used a nested-name-specifier to 2008 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2009 /// declaration. When true, a MemberNameQualifier 2010 /// structure is allocated immediately after the MemberExpr. 2011 bool HasQualifierOrFoundDecl : 1; 2012 2013 /// \brief True if this member expression specified a template argument list 2014 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 2015 /// structure (and its TemplateArguments) are allocated immediately after 2016 /// the MemberExpr or, if the member expression also has a qualifier, after 2017 /// the MemberNameQualifier structure. 2018 bool HasExplicitTemplateArgumentList : 1; 2019 2020 /// \brief Retrieve the qualifier that preceded the member name, if any. 2021 MemberNameQualifier *getMemberQualifier() { 2022 assert(HasQualifierOrFoundDecl); 2023 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2024 } 2025 2026 /// \brief Retrieve the qualifier that preceded the member name, if any. 2027 const MemberNameQualifier *getMemberQualifier() const { 2028 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2029 } 2030 2031public: 2032 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2033 const DeclarationNameInfo &NameInfo, QualType ty, 2034 ExprValueKind VK, ExprObjectKind OK) 2035 : Expr(MemberExprClass, ty, VK, OK, 2036 base->isTypeDependent(), 2037 base->isValueDependent(), 2038 base->isInstantiationDependent(), 2039 base->containsUnexpandedParameterPack()), 2040 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 2041 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 2042 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) { 2043 assert(memberdecl->getDeclName() == NameInfo.getName()); 2044 } 2045 2046 // NOTE: this constructor should be used only when it is known that 2047 // the member name can not provide additional syntactic info 2048 // (i.e., source locations for C++ operator names or type source info 2049 // for constructors, destructors and conversion oeprators). 2050 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2051 SourceLocation l, QualType ty, 2052 ExprValueKind VK, ExprObjectKind OK) 2053 : Expr(MemberExprClass, ty, VK, OK, 2054 base->isTypeDependent(), base->isValueDependent(), 2055 base->isInstantiationDependent(), 2056 base->containsUnexpandedParameterPack()), 2057 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 2058 IsArrow(isarrow), 2059 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 2060 2061 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2062 NestedNameSpecifierLoc QualifierLoc, 2063 ValueDecl *memberdecl, DeclAccessPair founddecl, 2064 DeclarationNameInfo MemberNameInfo, 2065 const TemplateArgumentListInfo *targs, 2066 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2067 2068 void setBase(Expr *E) { Base = E; } 2069 Expr *getBase() const { return cast<Expr>(Base); } 2070 2071 /// \brief Retrieve the member declaration to which this expression refers. 2072 /// 2073 /// The returned declaration will either be a FieldDecl or (in C++) 2074 /// a CXXMethodDecl. 2075 ValueDecl *getMemberDecl() const { return MemberDecl; } 2076 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2077 2078 /// \brief Retrieves the declaration found by lookup. 2079 DeclAccessPair getFoundDecl() const { 2080 if (!HasQualifierOrFoundDecl) 2081 return DeclAccessPair::make(getMemberDecl(), 2082 getMemberDecl()->getAccess()); 2083 return getMemberQualifier()->FoundDecl; 2084 } 2085 2086 /// \brief Determines whether this member expression actually had 2087 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2088 /// x->Base::foo. 2089 bool hasQualifier() const { return getQualifier() != 0; } 2090 2091 /// \brief If the member name was qualified, retrieves the 2092 /// nested-name-specifier that precedes the member name. Otherwise, returns 2093 /// NULL. 2094 NestedNameSpecifier *getQualifier() const { 2095 if (!HasQualifierOrFoundDecl) 2096 return 0; 2097 2098 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2099 } 2100 2101 /// \brief If the member name was qualified, retrieves the 2102 /// nested-name-specifier that precedes the member name, with source-location 2103 /// information. 2104 NestedNameSpecifierLoc getQualifierLoc() const { 2105 if (!hasQualifier()) 2106 return NestedNameSpecifierLoc(); 2107 2108 return getMemberQualifier()->QualifierLoc; 2109 } 2110 2111 /// \brief Determines whether this member expression actually had a C++ 2112 /// template argument list explicitly specified, e.g., x.f<int>. 2113 bool hasExplicitTemplateArgs() const { 2114 return HasExplicitTemplateArgumentList; 2115 } 2116 2117 /// \brief Copies the template arguments (if present) into the given 2118 /// structure. 2119 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2120 if (hasExplicitTemplateArgs()) 2121 getExplicitTemplateArgs().copyInto(List); 2122 } 2123 2124 /// \brief Retrieve the explicit template argument list that 2125 /// follow the member template name. This must only be called on an 2126 /// expression with explicit template arguments. 2127 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 2128 assert(HasExplicitTemplateArgumentList); 2129 if (!HasQualifierOrFoundDecl) 2130 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 2131 2132 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 2133 getMemberQualifier() + 1); 2134 } 2135 2136 /// \brief Retrieve the explicit template argument list that 2137 /// followed the member template name. This must only be called on 2138 /// an expression with explicit template arguments. 2139 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 2140 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2141 } 2142 2143 /// \brief Retrieves the optional explicit template arguments. 2144 /// This points to the same data as getExplicitTemplateArgs(), but 2145 /// returns null if there are no explicit template arguments. 2146 const ExplicitTemplateArgumentList *getOptionalExplicitTemplateArgs() const { 2147 if (!hasExplicitTemplateArgs()) return 0; 2148 return &getExplicitTemplateArgs(); 2149 } 2150 2151 /// \brief Retrieve the location of the left angle bracket following the 2152 /// member name ('<'), if any. 2153 SourceLocation getLAngleLoc() const { 2154 if (!HasExplicitTemplateArgumentList) 2155 return SourceLocation(); 2156 2157 return getExplicitTemplateArgs().LAngleLoc; 2158 } 2159 2160 /// \brief Retrieve the template arguments provided as part of this 2161 /// template-id. 2162 const TemplateArgumentLoc *getTemplateArgs() const { 2163 if (!HasExplicitTemplateArgumentList) 2164 return 0; 2165 2166 return getExplicitTemplateArgs().getTemplateArgs(); 2167 } 2168 2169 /// \brief Retrieve the number of template arguments provided as part of this 2170 /// template-id. 2171 unsigned getNumTemplateArgs() const { 2172 if (!HasExplicitTemplateArgumentList) 2173 return 0; 2174 2175 return getExplicitTemplateArgs().NumTemplateArgs; 2176 } 2177 2178 /// \brief Retrieve the location of the right angle bracket following the 2179 /// template arguments ('>'). 2180 SourceLocation getRAngleLoc() const { 2181 if (!HasExplicitTemplateArgumentList) 2182 return SourceLocation(); 2183 2184 return getExplicitTemplateArgs().RAngleLoc; 2185 } 2186 2187 /// \brief Retrieve the member declaration name info. 2188 DeclarationNameInfo getMemberNameInfo() const { 2189 return DeclarationNameInfo(MemberDecl->getDeclName(), 2190 MemberLoc, MemberDNLoc); 2191 } 2192 2193 bool isArrow() const { return IsArrow; } 2194 void setArrow(bool A) { IsArrow = A; } 2195 2196 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2197 /// location of 'F'. 2198 SourceLocation getMemberLoc() const { return MemberLoc; } 2199 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2200 2201 SourceRange getSourceRange() const; 2202 2203 SourceLocation getExprLoc() const { return MemberLoc; } 2204 2205 /// \brief Determine whether the base of this explicit is implicit. 2206 bool isImplicitAccess() const { 2207 return getBase() && getBase()->isImplicitCXXThis(); 2208 } 2209 2210 static bool classof(const Stmt *T) { 2211 return T->getStmtClass() == MemberExprClass; 2212 } 2213 static bool classof(const MemberExpr *) { return true; } 2214 2215 // Iterators 2216 child_range children() { return child_range(&Base, &Base+1); } 2217 2218 friend class ASTReader; 2219 friend class ASTStmtWriter; 2220}; 2221 2222/// CompoundLiteralExpr - [C99 6.5.2.5] 2223/// 2224class CompoundLiteralExpr : public Expr { 2225 /// LParenLoc - If non-null, this is the location of the left paren in a 2226 /// compound literal like "(int){4}". This can be null if this is a 2227 /// synthesized compound expression. 2228 SourceLocation LParenLoc; 2229 2230 /// The type as written. This can be an incomplete array type, in 2231 /// which case the actual expression type will be different. 2232 TypeSourceInfo *TInfo; 2233 Stmt *Init; 2234 bool FileScope; 2235public: 2236 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2237 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2238 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2239 tinfo->getType()->isDependentType(), 2240 init->isValueDependent(), 2241 (init->isInstantiationDependent() || 2242 tinfo->getType()->isInstantiationDependentType()), 2243 init->containsUnexpandedParameterPack()), 2244 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2245 2246 /// \brief Construct an empty compound literal. 2247 explicit CompoundLiteralExpr(EmptyShell Empty) 2248 : Expr(CompoundLiteralExprClass, Empty) { } 2249 2250 const Expr *getInitializer() const { return cast<Expr>(Init); } 2251 Expr *getInitializer() { return cast<Expr>(Init); } 2252 void setInitializer(Expr *E) { Init = E; } 2253 2254 bool isFileScope() const { return FileScope; } 2255 void setFileScope(bool FS) { FileScope = FS; } 2256 2257 SourceLocation getLParenLoc() const { return LParenLoc; } 2258 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2259 2260 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2261 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2262 2263 SourceRange getSourceRange() const { 2264 // FIXME: Init should never be null. 2265 if (!Init) 2266 return SourceRange(); 2267 if (LParenLoc.isInvalid()) 2268 return Init->getSourceRange(); 2269 return SourceRange(LParenLoc, Init->getLocEnd()); 2270 } 2271 2272 static bool classof(const Stmt *T) { 2273 return T->getStmtClass() == CompoundLiteralExprClass; 2274 } 2275 static bool classof(const CompoundLiteralExpr *) { return true; } 2276 2277 // Iterators 2278 child_range children() { return child_range(&Init, &Init+1); } 2279}; 2280 2281/// CastExpr - Base class for type casts, including both implicit 2282/// casts (ImplicitCastExpr) and explicit casts that have some 2283/// representation in the source code (ExplicitCastExpr's derived 2284/// classes). 2285class CastExpr : public Expr { 2286public: 2287 typedef clang::CastKind CastKind; 2288 2289private: 2290 Stmt *Op; 2291 2292 void CheckCastConsistency() const { 2293#ifndef NDEBUG 2294 switch (getCastKind()) { 2295 case CK_DerivedToBase: 2296 case CK_UncheckedDerivedToBase: 2297 case CK_DerivedToBaseMemberPointer: 2298 case CK_BaseToDerived: 2299 case CK_BaseToDerivedMemberPointer: 2300 assert(!path_empty() && "Cast kind should have a base path!"); 2301 break; 2302 2303 // These should not have an inheritance path. 2304 case CK_BitCast: 2305 case CK_Dynamic: 2306 case CK_ToUnion: 2307 case CK_ArrayToPointerDecay: 2308 case CK_FunctionToPointerDecay: 2309 case CK_NullToMemberPointer: 2310 case CK_NullToPointer: 2311 case CK_ConstructorConversion: 2312 case CK_IntegralToPointer: 2313 case CK_PointerToIntegral: 2314 case CK_ToVoid: 2315 case CK_VectorSplat: 2316 case CK_IntegralCast: 2317 case CK_IntegralToFloating: 2318 case CK_FloatingToIntegral: 2319 case CK_FloatingCast: 2320 case CK_AnyPointerToObjCPointerCast: 2321 case CK_AnyPointerToBlockPointerCast: 2322 case CK_ObjCObjectLValueCast: 2323 case CK_FloatingRealToComplex: 2324 case CK_FloatingComplexToReal: 2325 case CK_FloatingComplexCast: 2326 case CK_FloatingComplexToIntegralComplex: 2327 case CK_IntegralRealToComplex: 2328 case CK_IntegralComplexToReal: 2329 case CK_IntegralComplexCast: 2330 case CK_IntegralComplexToFloatingComplex: 2331 case CK_ObjCProduceObject: 2332 case CK_ObjCConsumeObject: 2333 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 2334 // fallthrough to check for null base path 2335 2336 case CK_Dependent: 2337 case CK_LValueToRValue: 2338 case CK_GetObjCProperty: 2339 case CK_NoOp: 2340 case CK_PointerToBoolean: 2341 case CK_IntegralToBoolean: 2342 case CK_FloatingToBoolean: 2343 case CK_MemberPointerToBoolean: 2344 case CK_FloatingComplexToBoolean: 2345 case CK_IntegralComplexToBoolean: 2346 case CK_LValueBitCast: // -> bool& 2347 case CK_UserDefinedConversion: // operator bool() 2348 assert(path_empty() && "Cast kind should not have a base path!"); 2349 break; 2350 } 2351#endif 2352 } 2353 2354 const CXXBaseSpecifier * const *path_buffer() const { 2355 return const_cast<CastExpr*>(this)->path_buffer(); 2356 } 2357 CXXBaseSpecifier **path_buffer(); 2358 2359 void setBasePathSize(unsigned basePathSize) { 2360 CastExprBits.BasePathSize = basePathSize; 2361 assert(CastExprBits.BasePathSize == basePathSize && 2362 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2363 } 2364 2365protected: 2366 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2367 const CastKind kind, Expr *op, unsigned BasePathSize) : 2368 Expr(SC, ty, VK, OK_Ordinary, 2369 // Cast expressions are type-dependent if the type is 2370 // dependent (C++ [temp.dep.expr]p3). 2371 ty->isDependentType(), 2372 // Cast expressions are value-dependent if the type is 2373 // dependent or if the subexpression is value-dependent. 2374 ty->isDependentType() || (op && op->isValueDependent()), 2375 (ty->isInstantiationDependentType() || 2376 (op && op->isInstantiationDependent())), 2377 (ty->containsUnexpandedParameterPack() || 2378 op->containsUnexpandedParameterPack())), 2379 Op(op) { 2380 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2381 CastExprBits.Kind = kind; 2382 setBasePathSize(BasePathSize); 2383 CheckCastConsistency(); 2384 } 2385 2386 /// \brief Construct an empty cast. 2387 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2388 : Expr(SC, Empty) { 2389 setBasePathSize(BasePathSize); 2390 } 2391 2392public: 2393 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2394 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2395 const char *getCastKindName() const; 2396 2397 Expr *getSubExpr() { return cast<Expr>(Op); } 2398 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2399 void setSubExpr(Expr *E) { Op = E; } 2400 2401 /// \brief Retrieve the cast subexpression as it was written in the source 2402 /// code, looking through any implicit casts or other intermediate nodes 2403 /// introduced by semantic analysis. 2404 Expr *getSubExprAsWritten(); 2405 const Expr *getSubExprAsWritten() const { 2406 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2407 } 2408 2409 typedef CXXBaseSpecifier **path_iterator; 2410 typedef const CXXBaseSpecifier * const *path_const_iterator; 2411 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2412 unsigned path_size() const { return CastExprBits.BasePathSize; } 2413 path_iterator path_begin() { return path_buffer(); } 2414 path_iterator path_end() { return path_buffer() + path_size(); } 2415 path_const_iterator path_begin() const { return path_buffer(); } 2416 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2417 2418 void setCastPath(const CXXCastPath &Path); 2419 2420 static bool classof(const Stmt *T) { 2421 return T->getStmtClass() >= firstCastExprConstant && 2422 T->getStmtClass() <= lastCastExprConstant; 2423 } 2424 static bool classof(const CastExpr *) { return true; } 2425 2426 // Iterators 2427 child_range children() { return child_range(&Op, &Op+1); } 2428}; 2429 2430/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2431/// conversions, which have no direct representation in the original 2432/// source code. For example: converting T[]->T*, void f()->void 2433/// (*f)(), float->double, short->int, etc. 2434/// 2435/// In C, implicit casts always produce rvalues. However, in C++, an 2436/// implicit cast whose result is being bound to a reference will be 2437/// an lvalue or xvalue. For example: 2438/// 2439/// @code 2440/// class Base { }; 2441/// class Derived : public Base { }; 2442/// Derived &&ref(); 2443/// void f(Derived d) { 2444/// Base& b = d; // initializer is an ImplicitCastExpr 2445/// // to an lvalue of type Base 2446/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2447/// // to an xvalue of type Base 2448/// } 2449/// @endcode 2450class ImplicitCastExpr : public CastExpr { 2451private: 2452 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2453 unsigned BasePathLength, ExprValueKind VK) 2454 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2455 } 2456 2457 /// \brief Construct an empty implicit cast. 2458 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2459 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2460 2461public: 2462 enum OnStack_t { OnStack }; 2463 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2464 ExprValueKind VK) 2465 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2466 } 2467 2468 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2469 CastKind Kind, Expr *Operand, 2470 const CXXCastPath *BasePath, 2471 ExprValueKind Cat); 2472 2473 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2474 2475 SourceRange getSourceRange() const { 2476 return getSubExpr()->getSourceRange(); 2477 } 2478 2479 static bool classof(const Stmt *T) { 2480 return T->getStmtClass() == ImplicitCastExprClass; 2481 } 2482 static bool classof(const ImplicitCastExpr *) { return true; } 2483}; 2484 2485/// ExplicitCastExpr - An explicit cast written in the source 2486/// code. 2487/// 2488/// This class is effectively an abstract class, because it provides 2489/// the basic representation of an explicitly-written cast without 2490/// specifying which kind of cast (C cast, functional cast, static 2491/// cast, etc.) was written; specific derived classes represent the 2492/// particular style of cast and its location information. 2493/// 2494/// Unlike implicit casts, explicit cast nodes have two different 2495/// types: the type that was written into the source code, and the 2496/// actual type of the expression as determined by semantic 2497/// analysis. These types may differ slightly. For example, in C++ one 2498/// can cast to a reference type, which indicates that the resulting 2499/// expression will be an lvalue or xvalue. The reference type, however, 2500/// will not be used as the type of the expression. 2501class ExplicitCastExpr : public CastExpr { 2502 /// TInfo - Source type info for the (written) type 2503 /// this expression is casting to. 2504 TypeSourceInfo *TInfo; 2505 2506protected: 2507 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2508 CastKind kind, Expr *op, unsigned PathSize, 2509 TypeSourceInfo *writtenTy) 2510 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2511 2512 /// \brief Construct an empty explicit cast. 2513 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2514 : CastExpr(SC, Shell, PathSize) { } 2515 2516public: 2517 /// getTypeInfoAsWritten - Returns the type source info for the type 2518 /// that this expression is casting to. 2519 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2520 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2521 2522 /// getTypeAsWritten - Returns the type that this expression is 2523 /// casting to, as written in the source code. 2524 QualType getTypeAsWritten() const { return TInfo->getType(); } 2525 2526 static bool classof(const Stmt *T) { 2527 return T->getStmtClass() >= firstExplicitCastExprConstant && 2528 T->getStmtClass() <= lastExplicitCastExprConstant; 2529 } 2530 static bool classof(const ExplicitCastExpr *) { return true; } 2531}; 2532 2533/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2534/// cast in C++ (C++ [expr.cast]), which uses the syntax 2535/// (Type)expr. For example: @c (int)f. 2536class CStyleCastExpr : public ExplicitCastExpr { 2537 SourceLocation LPLoc; // the location of the left paren 2538 SourceLocation RPLoc; // the location of the right paren 2539 2540 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2541 unsigned PathSize, TypeSourceInfo *writtenTy, 2542 SourceLocation l, SourceLocation r) 2543 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2544 writtenTy), LPLoc(l), RPLoc(r) {} 2545 2546 /// \brief Construct an empty C-style explicit cast. 2547 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2548 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2549 2550public: 2551 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2552 ExprValueKind VK, CastKind K, 2553 Expr *Op, const CXXCastPath *BasePath, 2554 TypeSourceInfo *WrittenTy, SourceLocation L, 2555 SourceLocation R); 2556 2557 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2558 2559 SourceLocation getLParenLoc() const { return LPLoc; } 2560 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2561 2562 SourceLocation getRParenLoc() const { return RPLoc; } 2563 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2564 2565 SourceRange getSourceRange() const { 2566 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2567 } 2568 static bool classof(const Stmt *T) { 2569 return T->getStmtClass() == CStyleCastExprClass; 2570 } 2571 static bool classof(const CStyleCastExpr *) { return true; } 2572}; 2573 2574/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2575/// 2576/// This expression node kind describes a builtin binary operation, 2577/// such as "x + y" for integer values "x" and "y". The operands will 2578/// already have been converted to appropriate types (e.g., by 2579/// performing promotions or conversions). 2580/// 2581/// In C++, where operators may be overloaded, a different kind of 2582/// expression node (CXXOperatorCallExpr) is used to express the 2583/// invocation of an overloaded operator with operator syntax. Within 2584/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2585/// used to store an expression "x + y" depends on the subexpressions 2586/// for x and y. If neither x or y is type-dependent, and the "+" 2587/// operator resolves to a built-in operation, BinaryOperator will be 2588/// used to express the computation (x and y may still be 2589/// value-dependent). If either x or y is type-dependent, or if the 2590/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2591/// be used to express the computation. 2592class BinaryOperator : public Expr { 2593public: 2594 typedef BinaryOperatorKind Opcode; 2595 2596private: 2597 unsigned Opc : 6; 2598 SourceLocation OpLoc; 2599 2600 enum { LHS, RHS, END_EXPR }; 2601 Stmt* SubExprs[END_EXPR]; 2602public: 2603 2604 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2605 ExprValueKind VK, ExprObjectKind OK, 2606 SourceLocation opLoc) 2607 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2608 lhs->isTypeDependent() || rhs->isTypeDependent(), 2609 lhs->isValueDependent() || rhs->isValueDependent(), 2610 (lhs->isInstantiationDependent() || 2611 rhs->isInstantiationDependent()), 2612 (lhs->containsUnexpandedParameterPack() || 2613 rhs->containsUnexpandedParameterPack())), 2614 Opc(opc), OpLoc(opLoc) { 2615 SubExprs[LHS] = lhs; 2616 SubExprs[RHS] = rhs; 2617 assert(!isCompoundAssignmentOp() && 2618 "Use ArithAssignBinaryOperator for compound assignments"); 2619 } 2620 2621 /// \brief Construct an empty binary operator. 2622 explicit BinaryOperator(EmptyShell Empty) 2623 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2624 2625 SourceLocation getOperatorLoc() const { return OpLoc; } 2626 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2627 2628 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2629 void setOpcode(Opcode O) { Opc = O; } 2630 2631 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2632 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2633 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2634 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2635 2636 SourceRange getSourceRange() const { 2637 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2638 } 2639 2640 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2641 /// corresponds to, e.g. "<<=". 2642 static const char *getOpcodeStr(Opcode Op); 2643 2644 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2645 2646 /// \brief Retrieve the binary opcode that corresponds to the given 2647 /// overloaded operator. 2648 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2649 2650 /// \brief Retrieve the overloaded operator kind that corresponds to 2651 /// the given binary opcode. 2652 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2653 2654 /// predicates to categorize the respective opcodes. 2655 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2656 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2657 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2658 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2659 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2660 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2661 2662 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2663 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2664 2665 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2666 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2667 2668 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2669 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2670 2671 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2672 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2673 2674 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2675 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2676 2677 static bool isAssignmentOp(Opcode Opc) { 2678 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2679 } 2680 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2681 2682 static bool isCompoundAssignmentOp(Opcode Opc) { 2683 return Opc > BO_Assign && Opc <= BO_OrAssign; 2684 } 2685 bool isCompoundAssignmentOp() const { 2686 return isCompoundAssignmentOp(getOpcode()); 2687 } 2688 2689 static bool isShiftAssignOp(Opcode Opc) { 2690 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2691 } 2692 bool isShiftAssignOp() const { 2693 return isShiftAssignOp(getOpcode()); 2694 } 2695 2696 static bool classof(const Stmt *S) { 2697 return S->getStmtClass() >= firstBinaryOperatorConstant && 2698 S->getStmtClass() <= lastBinaryOperatorConstant; 2699 } 2700 static bool classof(const BinaryOperator *) { return true; } 2701 2702 // Iterators 2703 child_range children() { 2704 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2705 } 2706 2707protected: 2708 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2709 ExprValueKind VK, ExprObjectKind OK, 2710 SourceLocation opLoc, bool dead) 2711 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2712 lhs->isTypeDependent() || rhs->isTypeDependent(), 2713 lhs->isValueDependent() || rhs->isValueDependent(), 2714 (lhs->isInstantiationDependent() || 2715 rhs->isInstantiationDependent()), 2716 (lhs->containsUnexpandedParameterPack() || 2717 rhs->containsUnexpandedParameterPack())), 2718 Opc(opc), OpLoc(opLoc) { 2719 SubExprs[LHS] = lhs; 2720 SubExprs[RHS] = rhs; 2721 } 2722 2723 BinaryOperator(StmtClass SC, EmptyShell Empty) 2724 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2725}; 2726 2727/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2728/// track of the type the operation is performed in. Due to the semantics of 2729/// these operators, the operands are promoted, the aritmetic performed, an 2730/// implicit conversion back to the result type done, then the assignment takes 2731/// place. This captures the intermediate type which the computation is done 2732/// in. 2733class CompoundAssignOperator : public BinaryOperator { 2734 QualType ComputationLHSType; 2735 QualType ComputationResultType; 2736public: 2737 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2738 ExprValueKind VK, ExprObjectKind OK, 2739 QualType CompLHSType, QualType CompResultType, 2740 SourceLocation OpLoc) 2741 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2742 ComputationLHSType(CompLHSType), 2743 ComputationResultType(CompResultType) { 2744 assert(isCompoundAssignmentOp() && 2745 "Only should be used for compound assignments"); 2746 } 2747 2748 /// \brief Build an empty compound assignment operator expression. 2749 explicit CompoundAssignOperator(EmptyShell Empty) 2750 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2751 2752 // The two computation types are the type the LHS is converted 2753 // to for the computation and the type of the result; the two are 2754 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2755 QualType getComputationLHSType() const { return ComputationLHSType; } 2756 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2757 2758 QualType getComputationResultType() const { return ComputationResultType; } 2759 void setComputationResultType(QualType T) { ComputationResultType = T; } 2760 2761 static bool classof(const CompoundAssignOperator *) { return true; } 2762 static bool classof(const Stmt *S) { 2763 return S->getStmtClass() == CompoundAssignOperatorClass; 2764 } 2765}; 2766 2767/// AbstractConditionalOperator - An abstract base class for 2768/// ConditionalOperator and BinaryConditionalOperator. 2769class AbstractConditionalOperator : public Expr { 2770 SourceLocation QuestionLoc, ColonLoc; 2771 friend class ASTStmtReader; 2772 2773protected: 2774 AbstractConditionalOperator(StmtClass SC, QualType T, 2775 ExprValueKind VK, ExprObjectKind OK, 2776 bool TD, bool VD, bool ID, 2777 bool ContainsUnexpandedParameterPack, 2778 SourceLocation qloc, 2779 SourceLocation cloc) 2780 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 2781 QuestionLoc(qloc), ColonLoc(cloc) {} 2782 2783 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2784 : Expr(SC, Empty) { } 2785 2786public: 2787 // getCond - Return the expression representing the condition for 2788 // the ?: operator. 2789 Expr *getCond() const; 2790 2791 // getTrueExpr - Return the subexpression representing the value of 2792 // the expression if the condition evaluates to true. 2793 Expr *getTrueExpr() const; 2794 2795 // getFalseExpr - Return the subexpression representing the value of 2796 // the expression if the condition evaluates to false. This is 2797 // the same as getRHS. 2798 Expr *getFalseExpr() const; 2799 2800 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2801 SourceLocation getColonLoc() const { return ColonLoc; } 2802 2803 static bool classof(const Stmt *T) { 2804 return T->getStmtClass() == ConditionalOperatorClass || 2805 T->getStmtClass() == BinaryConditionalOperatorClass; 2806 } 2807 static bool classof(const AbstractConditionalOperator *) { return true; } 2808}; 2809 2810/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2811/// middle" extension is a BinaryConditionalOperator. 2812class ConditionalOperator : public AbstractConditionalOperator { 2813 enum { COND, LHS, RHS, END_EXPR }; 2814 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2815 2816 friend class ASTStmtReader; 2817public: 2818 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2819 SourceLocation CLoc, Expr *rhs, 2820 QualType t, ExprValueKind VK, ExprObjectKind OK) 2821 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 2822 // FIXME: the type of the conditional operator doesn't 2823 // depend on the type of the conditional, but the standard 2824 // seems to imply that it could. File a bug! 2825 (lhs->isTypeDependent() || rhs->isTypeDependent()), 2826 (cond->isValueDependent() || lhs->isValueDependent() || 2827 rhs->isValueDependent()), 2828 (cond->isInstantiationDependent() || 2829 lhs->isInstantiationDependent() || 2830 rhs->isInstantiationDependent()), 2831 (cond->containsUnexpandedParameterPack() || 2832 lhs->containsUnexpandedParameterPack() || 2833 rhs->containsUnexpandedParameterPack()), 2834 QLoc, CLoc) { 2835 SubExprs[COND] = cond; 2836 SubExprs[LHS] = lhs; 2837 SubExprs[RHS] = rhs; 2838 } 2839 2840 /// \brief Build an empty conditional operator. 2841 explicit ConditionalOperator(EmptyShell Empty) 2842 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 2843 2844 // getCond - Return the expression representing the condition for 2845 // the ?: operator. 2846 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2847 2848 // getTrueExpr - Return the subexpression representing the value of 2849 // the expression if the condition evaluates to true. 2850 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 2851 2852 // getFalseExpr - Return the subexpression representing the value of 2853 // the expression if the condition evaluates to false. This is 2854 // the same as getRHS. 2855 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2856 2857 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2858 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2859 2860 SourceRange getSourceRange() const { 2861 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2862 } 2863 static bool classof(const Stmt *T) { 2864 return T->getStmtClass() == ConditionalOperatorClass; 2865 } 2866 static bool classof(const ConditionalOperator *) { return true; } 2867 2868 // Iterators 2869 child_range children() { 2870 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2871 } 2872}; 2873 2874/// BinaryConditionalOperator - The GNU extension to the conditional 2875/// operator which allows the middle operand to be omitted. 2876/// 2877/// This is a different expression kind on the assumption that almost 2878/// every client ends up needing to know that these are different. 2879class BinaryConditionalOperator : public AbstractConditionalOperator { 2880 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 2881 2882 /// - the common condition/left-hand-side expression, which will be 2883 /// evaluated as the opaque value 2884 /// - the condition, expressed in terms of the opaque value 2885 /// - the left-hand-side, expressed in terms of the opaque value 2886 /// - the right-hand-side 2887 Stmt *SubExprs[NUM_SUBEXPRS]; 2888 OpaqueValueExpr *OpaqueValue; 2889 2890 friend class ASTStmtReader; 2891public: 2892 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 2893 Expr *cond, Expr *lhs, Expr *rhs, 2894 SourceLocation qloc, SourceLocation cloc, 2895 QualType t, ExprValueKind VK, ExprObjectKind OK) 2896 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 2897 (common->isTypeDependent() || rhs->isTypeDependent()), 2898 (common->isValueDependent() || rhs->isValueDependent()), 2899 (common->isInstantiationDependent() || 2900 rhs->isInstantiationDependent()), 2901 (common->containsUnexpandedParameterPack() || 2902 rhs->containsUnexpandedParameterPack()), 2903 qloc, cloc), 2904 OpaqueValue(opaqueValue) { 2905 SubExprs[COMMON] = common; 2906 SubExprs[COND] = cond; 2907 SubExprs[LHS] = lhs; 2908 SubExprs[RHS] = rhs; 2909 2910 OpaqueValue->setSourceExpr(common); 2911 } 2912 2913 /// \brief Build an empty conditional operator. 2914 explicit BinaryConditionalOperator(EmptyShell Empty) 2915 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 2916 2917 /// \brief getCommon - Return the common expression, written to the 2918 /// left of the condition. The opaque value will be bound to the 2919 /// result of this expression. 2920 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 2921 2922 /// \brief getOpaqueValue - Return the opaque value placeholder. 2923 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 2924 2925 /// \brief getCond - Return the condition expression; this is defined 2926 /// in terms of the opaque value. 2927 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2928 2929 /// \brief getTrueExpr - Return the subexpression which will be 2930 /// evaluated if the condition evaluates to true; this is defined 2931 /// in terms of the opaque value. 2932 Expr *getTrueExpr() const { 2933 return cast<Expr>(SubExprs[LHS]); 2934 } 2935 2936 /// \brief getFalseExpr - Return the subexpression which will be 2937 /// evaluated if the condnition evaluates to false; this is 2938 /// defined in terms of the opaque value. 2939 Expr *getFalseExpr() const { 2940 return cast<Expr>(SubExprs[RHS]); 2941 } 2942 2943 SourceRange getSourceRange() const { 2944 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 2945 } 2946 static bool classof(const Stmt *T) { 2947 return T->getStmtClass() == BinaryConditionalOperatorClass; 2948 } 2949 static bool classof(const BinaryConditionalOperator *) { return true; } 2950 2951 // Iterators 2952 child_range children() { 2953 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 2954 } 2955}; 2956 2957inline Expr *AbstractConditionalOperator::getCond() const { 2958 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2959 return co->getCond(); 2960 return cast<BinaryConditionalOperator>(this)->getCond(); 2961} 2962 2963inline Expr *AbstractConditionalOperator::getTrueExpr() const { 2964 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2965 return co->getTrueExpr(); 2966 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 2967} 2968 2969inline Expr *AbstractConditionalOperator::getFalseExpr() const { 2970 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2971 return co->getFalseExpr(); 2972 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 2973} 2974 2975/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2976class AddrLabelExpr : public Expr { 2977 SourceLocation AmpAmpLoc, LabelLoc; 2978 LabelDecl *Label; 2979public: 2980 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 2981 QualType t) 2982 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 2983 false), 2984 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2985 2986 /// \brief Build an empty address of a label expression. 2987 explicit AddrLabelExpr(EmptyShell Empty) 2988 : Expr(AddrLabelExprClass, Empty) { } 2989 2990 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2991 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2992 SourceLocation getLabelLoc() const { return LabelLoc; } 2993 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2994 2995 SourceRange getSourceRange() const { 2996 return SourceRange(AmpAmpLoc, LabelLoc); 2997 } 2998 2999 LabelDecl *getLabel() const { return Label; } 3000 void setLabel(LabelDecl *L) { Label = L; } 3001 3002 static bool classof(const Stmt *T) { 3003 return T->getStmtClass() == AddrLabelExprClass; 3004 } 3005 static bool classof(const AddrLabelExpr *) { return true; } 3006 3007 // Iterators 3008 child_range children() { return child_range(); } 3009}; 3010 3011/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3012/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3013/// takes the value of the last subexpression. 3014/// 3015/// A StmtExpr is always an r-value; values "returned" out of a 3016/// StmtExpr will be copied. 3017class StmtExpr : public Expr { 3018 Stmt *SubStmt; 3019 SourceLocation LParenLoc, RParenLoc; 3020public: 3021 // FIXME: Does type-dependence need to be computed differently? 3022 // FIXME: Do we need to compute instantiation instantiation-dependence for 3023 // statements? (ugh!) 3024 StmtExpr(CompoundStmt *substmt, QualType T, 3025 SourceLocation lp, SourceLocation rp) : 3026 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3027 T->isDependentType(), false, false, false), 3028 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3029 3030 /// \brief Build an empty statement expression. 3031 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3032 3033 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3034 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3035 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3036 3037 SourceRange getSourceRange() const { 3038 return SourceRange(LParenLoc, RParenLoc); 3039 } 3040 3041 SourceLocation getLParenLoc() const { return LParenLoc; } 3042 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3043 SourceLocation getRParenLoc() const { return RParenLoc; } 3044 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3045 3046 static bool classof(const Stmt *T) { 3047 return T->getStmtClass() == StmtExprClass; 3048 } 3049 static bool classof(const StmtExpr *) { return true; } 3050 3051 // Iterators 3052 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3053}; 3054 3055 3056/// ShuffleVectorExpr - clang-specific builtin-in function 3057/// __builtin_shufflevector. 3058/// This AST node represents a operator that does a constant 3059/// shuffle, similar to LLVM's shufflevector instruction. It takes 3060/// two vectors and a variable number of constant indices, 3061/// and returns the appropriately shuffled vector. 3062class ShuffleVectorExpr : public Expr { 3063 SourceLocation BuiltinLoc, RParenLoc; 3064 3065 // SubExprs - the list of values passed to the __builtin_shufflevector 3066 // function. The first two are vectors, and the rest are constant 3067 // indices. The number of values in this list is always 3068 // 2+the number of indices in the vector type. 3069 Stmt **SubExprs; 3070 unsigned NumExprs; 3071 3072public: 3073 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3074 QualType Type, SourceLocation BLoc, 3075 SourceLocation RP); 3076 3077 /// \brief Build an empty vector-shuffle expression. 3078 explicit ShuffleVectorExpr(EmptyShell Empty) 3079 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3080 3081 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3082 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3083 3084 SourceLocation getRParenLoc() const { return RParenLoc; } 3085 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3086 3087 SourceRange getSourceRange() const { 3088 return SourceRange(BuiltinLoc, RParenLoc); 3089 } 3090 static bool classof(const Stmt *T) { 3091 return T->getStmtClass() == ShuffleVectorExprClass; 3092 } 3093 static bool classof(const ShuffleVectorExpr *) { return true; } 3094 3095 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3096 /// constant expression, the actual arguments passed in, and the function 3097 /// pointers. 3098 unsigned getNumSubExprs() const { return NumExprs; } 3099 3100 /// \brief Retrieve the array of expressions. 3101 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3102 3103 /// getExpr - Return the Expr at the specified index. 3104 Expr *getExpr(unsigned Index) { 3105 assert((Index < NumExprs) && "Arg access out of range!"); 3106 return cast<Expr>(SubExprs[Index]); 3107 } 3108 const Expr *getExpr(unsigned Index) const { 3109 assert((Index < NumExprs) && "Arg access out of range!"); 3110 return cast<Expr>(SubExprs[Index]); 3111 } 3112 3113 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3114 3115 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3116 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3117 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 3118 } 3119 3120 // Iterators 3121 child_range children() { 3122 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3123 } 3124}; 3125 3126/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3127/// This AST node is similar to the conditional operator (?:) in C, with 3128/// the following exceptions: 3129/// - the test expression must be a integer constant expression. 3130/// - the expression returned acts like the chosen subexpression in every 3131/// visible way: the type is the same as that of the chosen subexpression, 3132/// and all predicates (whether it's an l-value, whether it's an integer 3133/// constant expression, etc.) return the same result as for the chosen 3134/// sub-expression. 3135class ChooseExpr : public Expr { 3136 enum { COND, LHS, RHS, END_EXPR }; 3137 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3138 SourceLocation BuiltinLoc, RParenLoc; 3139public: 3140 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3141 QualType t, ExprValueKind VK, ExprObjectKind OK, 3142 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3143 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3144 (cond->isInstantiationDependent() || 3145 lhs->isInstantiationDependent() || 3146 rhs->isInstantiationDependent()), 3147 (cond->containsUnexpandedParameterPack() || 3148 lhs->containsUnexpandedParameterPack() || 3149 rhs->containsUnexpandedParameterPack())), 3150 BuiltinLoc(BLoc), RParenLoc(RP) { 3151 SubExprs[COND] = cond; 3152 SubExprs[LHS] = lhs; 3153 SubExprs[RHS] = rhs; 3154 } 3155 3156 /// \brief Build an empty __builtin_choose_expr. 3157 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3158 3159 /// isConditionTrue - Return whether the condition is true (i.e. not 3160 /// equal to zero). 3161 bool isConditionTrue(const ASTContext &C) const; 3162 3163 /// getChosenSubExpr - Return the subexpression chosen according to the 3164 /// condition. 3165 Expr *getChosenSubExpr(const ASTContext &C) const { 3166 return isConditionTrue(C) ? getLHS() : getRHS(); 3167 } 3168 3169 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3170 void setCond(Expr *E) { SubExprs[COND] = E; } 3171 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3172 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3173 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3174 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3175 3176 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3177 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3178 3179 SourceLocation getRParenLoc() const { return RParenLoc; } 3180 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3181 3182 SourceRange getSourceRange() const { 3183 return SourceRange(BuiltinLoc, RParenLoc); 3184 } 3185 static bool classof(const Stmt *T) { 3186 return T->getStmtClass() == ChooseExprClass; 3187 } 3188 static bool classof(const ChooseExpr *) { return true; } 3189 3190 // Iterators 3191 child_range children() { 3192 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3193 } 3194}; 3195 3196/// GNUNullExpr - Implements the GNU __null extension, which is a name 3197/// for a null pointer constant that has integral type (e.g., int or 3198/// long) and is the same size and alignment as a pointer. The __null 3199/// extension is typically only used by system headers, which define 3200/// NULL as __null in C++ rather than using 0 (which is an integer 3201/// that may not match the size of a pointer). 3202class GNUNullExpr : public Expr { 3203 /// TokenLoc - The location of the __null keyword. 3204 SourceLocation TokenLoc; 3205 3206public: 3207 GNUNullExpr(QualType Ty, SourceLocation Loc) 3208 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3209 false), 3210 TokenLoc(Loc) { } 3211 3212 /// \brief Build an empty GNU __null expression. 3213 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3214 3215 /// getTokenLocation - The location of the __null token. 3216 SourceLocation getTokenLocation() const { return TokenLoc; } 3217 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3218 3219 SourceRange getSourceRange() const { 3220 return SourceRange(TokenLoc); 3221 } 3222 static bool classof(const Stmt *T) { 3223 return T->getStmtClass() == GNUNullExprClass; 3224 } 3225 static bool classof(const GNUNullExpr *) { return true; } 3226 3227 // Iterators 3228 child_range children() { return child_range(); } 3229}; 3230 3231/// VAArgExpr, used for the builtin function __builtin_va_arg. 3232class VAArgExpr : public Expr { 3233 Stmt *Val; 3234 TypeSourceInfo *TInfo; 3235 SourceLocation BuiltinLoc, RParenLoc; 3236public: 3237 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3238 SourceLocation RPLoc, QualType t) 3239 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3240 t->isDependentType(), false, 3241 (TInfo->getType()->isInstantiationDependentType() || 3242 e->isInstantiationDependent()), 3243 (TInfo->getType()->containsUnexpandedParameterPack() || 3244 e->containsUnexpandedParameterPack())), 3245 Val(e), TInfo(TInfo), 3246 BuiltinLoc(BLoc), 3247 RParenLoc(RPLoc) { } 3248 3249 /// \brief Create an empty __builtin_va_arg expression. 3250 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3251 3252 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3253 Expr *getSubExpr() { return cast<Expr>(Val); } 3254 void setSubExpr(Expr *E) { Val = E; } 3255 3256 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3257 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3258 3259 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3260 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3261 3262 SourceLocation getRParenLoc() const { return RParenLoc; } 3263 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3264 3265 SourceRange getSourceRange() const { 3266 return SourceRange(BuiltinLoc, RParenLoc); 3267 } 3268 static bool classof(const Stmt *T) { 3269 return T->getStmtClass() == VAArgExprClass; 3270 } 3271 static bool classof(const VAArgExpr *) { return true; } 3272 3273 // Iterators 3274 child_range children() { return child_range(&Val, &Val+1); } 3275}; 3276 3277/// @brief Describes an C or C++ initializer list. 3278/// 3279/// InitListExpr describes an initializer list, which can be used to 3280/// initialize objects of different types, including 3281/// struct/class/union types, arrays, and vectors. For example: 3282/// 3283/// @code 3284/// struct foo x = { 1, { 2, 3 } }; 3285/// @endcode 3286/// 3287/// Prior to semantic analysis, an initializer list will represent the 3288/// initializer list as written by the user, but will have the 3289/// placeholder type "void". This initializer list is called the 3290/// syntactic form of the initializer, and may contain C99 designated 3291/// initializers (represented as DesignatedInitExprs), initializations 3292/// of subobject members without explicit braces, and so on. Clients 3293/// interested in the original syntax of the initializer list should 3294/// use the syntactic form of the initializer list. 3295/// 3296/// After semantic analysis, the initializer list will represent the 3297/// semantic form of the initializer, where the initializations of all 3298/// subobjects are made explicit with nested InitListExpr nodes and 3299/// C99 designators have been eliminated by placing the designated 3300/// initializations into the subobject they initialize. Additionally, 3301/// any "holes" in the initialization, where no initializer has been 3302/// specified for a particular subobject, will be replaced with 3303/// implicitly-generated ImplicitValueInitExpr expressions that 3304/// value-initialize the subobjects. Note, however, that the 3305/// initializer lists may still have fewer initializers than there are 3306/// elements to initialize within the object. 3307/// 3308/// Given the semantic form of the initializer list, one can retrieve 3309/// the original syntactic form of that initializer list (if it 3310/// exists) using getSyntacticForm(). Since many initializer lists 3311/// have the same syntactic and semantic forms, getSyntacticForm() may 3312/// return NULL, indicating that the current initializer list also 3313/// serves as its syntactic form. 3314class InitListExpr : public Expr { 3315 // FIXME: Eliminate this vector in favor of ASTContext allocation 3316 typedef ASTVector<Stmt *> InitExprsTy; 3317 InitExprsTy InitExprs; 3318 SourceLocation LBraceLoc, RBraceLoc; 3319 3320 /// Contains the initializer list that describes the syntactic form 3321 /// written in the source code. 3322 InitListExpr *SyntacticForm; 3323 3324 /// \brief Either: 3325 /// If this initializer list initializes an array with more elements than 3326 /// there are initializers in the list, specifies an expression to be used 3327 /// for value initialization of the rest of the elements. 3328 /// Or 3329 /// If this initializer list initializes a union, specifies which 3330 /// field within the union will be initialized. 3331 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3332 3333 /// Whether this initializer list originally had a GNU array-range 3334 /// designator in it. This is a temporary marker used by CodeGen. 3335 bool HadArrayRangeDesignator; 3336 3337public: 3338 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3339 Expr **initexprs, unsigned numinits, 3340 SourceLocation rbraceloc); 3341 3342 /// \brief Build an empty initializer list. 3343 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3344 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3345 3346 unsigned getNumInits() const { return InitExprs.size(); } 3347 3348 /// \brief Retrieve the set of initializers. 3349 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3350 3351 const Expr *getInit(unsigned Init) const { 3352 assert(Init < getNumInits() && "Initializer access out of range!"); 3353 return cast_or_null<Expr>(InitExprs[Init]); 3354 } 3355 3356 Expr *getInit(unsigned Init) { 3357 assert(Init < getNumInits() && "Initializer access out of range!"); 3358 return cast_or_null<Expr>(InitExprs[Init]); 3359 } 3360 3361 void setInit(unsigned Init, Expr *expr) { 3362 assert(Init < getNumInits() && "Initializer access out of range!"); 3363 InitExprs[Init] = expr; 3364 } 3365 3366 /// \brief Reserve space for some number of initializers. 3367 void reserveInits(ASTContext &C, unsigned NumInits); 3368 3369 /// @brief Specify the number of initializers 3370 /// 3371 /// If there are more than @p NumInits initializers, the remaining 3372 /// initializers will be destroyed. If there are fewer than @p 3373 /// NumInits initializers, NULL expressions will be added for the 3374 /// unknown initializers. 3375 void resizeInits(ASTContext &Context, unsigned NumInits); 3376 3377 /// @brief Updates the initializer at index @p Init with the new 3378 /// expression @p expr, and returns the old expression at that 3379 /// location. 3380 /// 3381 /// When @p Init is out of range for this initializer list, the 3382 /// initializer list will be extended with NULL expressions to 3383 /// accommodate the new entry. 3384 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3385 3386 /// \brief If this initializer list initializes an array with more elements 3387 /// than there are initializers in the list, specifies an expression to be 3388 /// used for value initialization of the rest of the elements. 3389 Expr *getArrayFiller() { 3390 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3391 } 3392 const Expr *getArrayFiller() const { 3393 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3394 } 3395 void setArrayFiller(Expr *filler); 3396 3397 /// \brief If this initializes a union, specifies which field in the 3398 /// union to initialize. 3399 /// 3400 /// Typically, this field is the first named field within the 3401 /// union. However, a designated initializer can specify the 3402 /// initialization of a different field within the union. 3403 FieldDecl *getInitializedFieldInUnion() { 3404 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3405 } 3406 const FieldDecl *getInitializedFieldInUnion() const { 3407 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3408 } 3409 void setInitializedFieldInUnion(FieldDecl *FD) { 3410 ArrayFillerOrUnionFieldInit = FD; 3411 } 3412 3413 // Explicit InitListExpr's originate from source code (and have valid source 3414 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3415 bool isExplicit() { 3416 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3417 } 3418 3419 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3420 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3421 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3422 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3423 3424 /// @brief Retrieve the initializer list that describes the 3425 /// syntactic form of the initializer. 3426 /// 3427 /// 3428 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3429 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3430 3431 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3432 void sawArrayRangeDesignator(bool ARD = true) { 3433 HadArrayRangeDesignator = ARD; 3434 } 3435 3436 SourceRange getSourceRange() const; 3437 3438 static bool classof(const Stmt *T) { 3439 return T->getStmtClass() == InitListExprClass; 3440 } 3441 static bool classof(const InitListExpr *) { return true; } 3442 3443 // Iterators 3444 child_range children() { 3445 if (InitExprs.empty()) return child_range(); 3446 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3447 } 3448 3449 typedef InitExprsTy::iterator iterator; 3450 typedef InitExprsTy::const_iterator const_iterator; 3451 typedef InitExprsTy::reverse_iterator reverse_iterator; 3452 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3453 3454 iterator begin() { return InitExprs.begin(); } 3455 const_iterator begin() const { return InitExprs.begin(); } 3456 iterator end() { return InitExprs.end(); } 3457 const_iterator end() const { return InitExprs.end(); } 3458 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3459 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3460 reverse_iterator rend() { return InitExprs.rend(); } 3461 const_reverse_iterator rend() const { return InitExprs.rend(); } 3462 3463 friend class ASTStmtReader; 3464 friend class ASTStmtWriter; 3465}; 3466 3467/// @brief Represents a C99 designated initializer expression. 3468/// 3469/// A designated initializer expression (C99 6.7.8) contains one or 3470/// more designators (which can be field designators, array 3471/// designators, or GNU array-range designators) followed by an 3472/// expression that initializes the field or element(s) that the 3473/// designators refer to. For example, given: 3474/// 3475/// @code 3476/// struct point { 3477/// double x; 3478/// double y; 3479/// }; 3480/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3481/// @endcode 3482/// 3483/// The InitListExpr contains three DesignatedInitExprs, the first of 3484/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3485/// designators, one array designator for @c [2] followed by one field 3486/// designator for @c .y. The initalization expression will be 1.0. 3487class DesignatedInitExpr : public Expr { 3488public: 3489 /// \brief Forward declaration of the Designator class. 3490 class Designator; 3491 3492private: 3493 /// The location of the '=' or ':' prior to the actual initializer 3494 /// expression. 3495 SourceLocation EqualOrColonLoc; 3496 3497 /// Whether this designated initializer used the GNU deprecated 3498 /// syntax rather than the C99 '=' syntax. 3499 bool GNUSyntax : 1; 3500 3501 /// The number of designators in this initializer expression. 3502 unsigned NumDesignators : 15; 3503 3504 /// \brief The designators in this designated initialization 3505 /// expression. 3506 Designator *Designators; 3507 3508 /// The number of subexpressions of this initializer expression, 3509 /// which contains both the initializer and any additional 3510 /// expressions used by array and array-range designators. 3511 unsigned NumSubExprs : 16; 3512 3513 3514 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3515 const Designator *Designators, 3516 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3517 Expr **IndexExprs, unsigned NumIndexExprs, 3518 Expr *Init); 3519 3520 explicit DesignatedInitExpr(unsigned NumSubExprs) 3521 : Expr(DesignatedInitExprClass, EmptyShell()), 3522 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3523 3524public: 3525 /// A field designator, e.g., ".x". 3526 struct FieldDesignator { 3527 /// Refers to the field that is being initialized. The low bit 3528 /// of this field determines whether this is actually a pointer 3529 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3530 /// initially constructed, a field designator will store an 3531 /// IdentifierInfo*. After semantic analysis has resolved that 3532 /// name, the field designator will instead store a FieldDecl*. 3533 uintptr_t NameOrField; 3534 3535 /// The location of the '.' in the designated initializer. 3536 unsigned DotLoc; 3537 3538 /// The location of the field name in the designated initializer. 3539 unsigned FieldLoc; 3540 }; 3541 3542 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3543 struct ArrayOrRangeDesignator { 3544 /// Location of the first index expression within the designated 3545 /// initializer expression's list of subexpressions. 3546 unsigned Index; 3547 /// The location of the '[' starting the array range designator. 3548 unsigned LBracketLoc; 3549 /// The location of the ellipsis separating the start and end 3550 /// indices. Only valid for GNU array-range designators. 3551 unsigned EllipsisLoc; 3552 /// The location of the ']' terminating the array range designator. 3553 unsigned RBracketLoc; 3554 }; 3555 3556 /// @brief Represents a single C99 designator. 3557 /// 3558 /// @todo This class is infuriatingly similar to clang::Designator, 3559 /// but minor differences (storing indices vs. storing pointers) 3560 /// keep us from reusing it. Try harder, later, to rectify these 3561 /// differences. 3562 class Designator { 3563 /// @brief The kind of designator this describes. 3564 enum { 3565 FieldDesignator, 3566 ArrayDesignator, 3567 ArrayRangeDesignator 3568 } Kind; 3569 3570 union { 3571 /// A field designator, e.g., ".x". 3572 struct FieldDesignator Field; 3573 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3574 struct ArrayOrRangeDesignator ArrayOrRange; 3575 }; 3576 friend class DesignatedInitExpr; 3577 3578 public: 3579 Designator() {} 3580 3581 /// @brief Initializes a field designator. 3582 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3583 SourceLocation FieldLoc) 3584 : Kind(FieldDesignator) { 3585 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3586 Field.DotLoc = DotLoc.getRawEncoding(); 3587 Field.FieldLoc = FieldLoc.getRawEncoding(); 3588 } 3589 3590 /// @brief Initializes an array designator. 3591 Designator(unsigned Index, SourceLocation LBracketLoc, 3592 SourceLocation RBracketLoc) 3593 : Kind(ArrayDesignator) { 3594 ArrayOrRange.Index = Index; 3595 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3596 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3597 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3598 } 3599 3600 /// @brief Initializes a GNU array-range designator. 3601 Designator(unsigned Index, SourceLocation LBracketLoc, 3602 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3603 : Kind(ArrayRangeDesignator) { 3604 ArrayOrRange.Index = Index; 3605 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3606 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3607 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3608 } 3609 3610 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3611 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3612 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3613 3614 IdentifierInfo *getFieldName() const; 3615 3616 FieldDecl *getField() const { 3617 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3618 if (Field.NameOrField & 0x01) 3619 return 0; 3620 else 3621 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3622 } 3623 3624 void setField(FieldDecl *FD) { 3625 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3626 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3627 } 3628 3629 SourceLocation getDotLoc() const { 3630 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3631 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3632 } 3633 3634 SourceLocation getFieldLoc() const { 3635 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3636 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3637 } 3638 3639 SourceLocation getLBracketLoc() const { 3640 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3641 "Only valid on an array or array-range designator"); 3642 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3643 } 3644 3645 SourceLocation getRBracketLoc() const { 3646 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3647 "Only valid on an array or array-range designator"); 3648 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3649 } 3650 3651 SourceLocation getEllipsisLoc() const { 3652 assert(Kind == ArrayRangeDesignator && 3653 "Only valid on an array-range designator"); 3654 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3655 } 3656 3657 unsigned getFirstExprIndex() const { 3658 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3659 "Only valid on an array or array-range designator"); 3660 return ArrayOrRange.Index; 3661 } 3662 3663 SourceLocation getStartLocation() const { 3664 if (Kind == FieldDesignator) 3665 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3666 else 3667 return getLBracketLoc(); 3668 } 3669 SourceLocation getEndLocation() const { 3670 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3671 } 3672 SourceRange getSourceRange() const { 3673 return SourceRange(getStartLocation(), getEndLocation()); 3674 } 3675 }; 3676 3677 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3678 unsigned NumDesignators, 3679 Expr **IndexExprs, unsigned NumIndexExprs, 3680 SourceLocation EqualOrColonLoc, 3681 bool GNUSyntax, Expr *Init); 3682 3683 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3684 3685 /// @brief Returns the number of designators in this initializer. 3686 unsigned size() const { return NumDesignators; } 3687 3688 // Iterator access to the designators. 3689 typedef Designator *designators_iterator; 3690 designators_iterator designators_begin() { return Designators; } 3691 designators_iterator designators_end() { 3692 return Designators + NumDesignators; 3693 } 3694 3695 typedef const Designator *const_designators_iterator; 3696 const_designators_iterator designators_begin() const { return Designators; } 3697 const_designators_iterator designators_end() const { 3698 return Designators + NumDesignators; 3699 } 3700 3701 typedef std::reverse_iterator<designators_iterator> 3702 reverse_designators_iterator; 3703 reverse_designators_iterator designators_rbegin() { 3704 return reverse_designators_iterator(designators_end()); 3705 } 3706 reverse_designators_iterator designators_rend() { 3707 return reverse_designators_iterator(designators_begin()); 3708 } 3709 3710 typedef std::reverse_iterator<const_designators_iterator> 3711 const_reverse_designators_iterator; 3712 const_reverse_designators_iterator designators_rbegin() const { 3713 return const_reverse_designators_iterator(designators_end()); 3714 } 3715 const_reverse_designators_iterator designators_rend() const { 3716 return const_reverse_designators_iterator(designators_begin()); 3717 } 3718 3719 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3720 3721 void setDesignators(ASTContext &C, const Designator *Desigs, 3722 unsigned NumDesigs); 3723 3724 Expr *getArrayIndex(const Designator& D); 3725 Expr *getArrayRangeStart(const Designator& D); 3726 Expr *getArrayRangeEnd(const Designator& D); 3727 3728 /// @brief Retrieve the location of the '=' that precedes the 3729 /// initializer value itself, if present. 3730 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3731 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3732 3733 /// @brief Determines whether this designated initializer used the 3734 /// deprecated GNU syntax for designated initializers. 3735 bool usesGNUSyntax() const { return GNUSyntax; } 3736 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3737 3738 /// @brief Retrieve the initializer value. 3739 Expr *getInit() const { 3740 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3741 } 3742 3743 void setInit(Expr *init) { 3744 *child_begin() = init; 3745 } 3746 3747 /// \brief Retrieve the total number of subexpressions in this 3748 /// designated initializer expression, including the actual 3749 /// initialized value and any expressions that occur within array 3750 /// and array-range designators. 3751 unsigned getNumSubExprs() const { return NumSubExprs; } 3752 3753 Expr *getSubExpr(unsigned Idx) { 3754 assert(Idx < NumSubExprs && "Subscript out of range"); 3755 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3756 Ptr += sizeof(DesignatedInitExpr); 3757 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3758 } 3759 3760 void setSubExpr(unsigned Idx, Expr *E) { 3761 assert(Idx < NumSubExprs && "Subscript out of range"); 3762 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3763 Ptr += sizeof(DesignatedInitExpr); 3764 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3765 } 3766 3767 /// \brief Replaces the designator at index @p Idx with the series 3768 /// of designators in [First, Last). 3769 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3770 const Designator *Last); 3771 3772 SourceRange getDesignatorsSourceRange() const; 3773 3774 SourceRange getSourceRange() const; 3775 3776 static bool classof(const Stmt *T) { 3777 return T->getStmtClass() == DesignatedInitExprClass; 3778 } 3779 static bool classof(const DesignatedInitExpr *) { return true; } 3780 3781 // Iterators 3782 child_range children() { 3783 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3784 return child_range(begin, begin + NumSubExprs); 3785 } 3786}; 3787 3788/// \brief Represents an implicitly-generated value initialization of 3789/// an object of a given type. 3790/// 3791/// Implicit value initializations occur within semantic initializer 3792/// list expressions (InitListExpr) as placeholders for subobject 3793/// initializations not explicitly specified by the user. 3794/// 3795/// \see InitListExpr 3796class ImplicitValueInitExpr : public Expr { 3797public: 3798 explicit ImplicitValueInitExpr(QualType ty) 3799 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3800 false, false, ty->isInstantiationDependentType(), false) { } 3801 3802 /// \brief Construct an empty implicit value initialization. 3803 explicit ImplicitValueInitExpr(EmptyShell Empty) 3804 : Expr(ImplicitValueInitExprClass, Empty) { } 3805 3806 static bool classof(const Stmt *T) { 3807 return T->getStmtClass() == ImplicitValueInitExprClass; 3808 } 3809 static bool classof(const ImplicitValueInitExpr *) { return true; } 3810 3811 SourceRange getSourceRange() const { 3812 return SourceRange(); 3813 } 3814 3815 // Iterators 3816 child_range children() { return child_range(); } 3817}; 3818 3819 3820class ParenListExpr : public Expr { 3821 Stmt **Exprs; 3822 unsigned NumExprs; 3823 SourceLocation LParenLoc, RParenLoc; 3824 3825public: 3826 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3827 unsigned numexprs, SourceLocation rparenloc, QualType T); 3828 3829 /// \brief Build an empty paren list. 3830 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3831 3832 unsigned getNumExprs() const { return NumExprs; } 3833 3834 const Expr* getExpr(unsigned Init) const { 3835 assert(Init < getNumExprs() && "Initializer access out of range!"); 3836 return cast_or_null<Expr>(Exprs[Init]); 3837 } 3838 3839 Expr* getExpr(unsigned Init) { 3840 assert(Init < getNumExprs() && "Initializer access out of range!"); 3841 return cast_or_null<Expr>(Exprs[Init]); 3842 } 3843 3844 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3845 3846 SourceLocation getLParenLoc() const { return LParenLoc; } 3847 SourceLocation getRParenLoc() const { return RParenLoc; } 3848 3849 SourceRange getSourceRange() const { 3850 return SourceRange(LParenLoc, RParenLoc); 3851 } 3852 static bool classof(const Stmt *T) { 3853 return T->getStmtClass() == ParenListExprClass; 3854 } 3855 static bool classof(const ParenListExpr *) { return true; } 3856 3857 // Iterators 3858 child_range children() { 3859 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 3860 } 3861 3862 friend class ASTStmtReader; 3863 friend class ASTStmtWriter; 3864}; 3865 3866 3867/// \brief Represents a C1X generic selection. 3868/// 3869/// A generic selection (C1X 6.5.1.1) contains an unevaluated controlling 3870/// expression, followed by one or more generic associations. Each generic 3871/// association specifies a type name and an expression, or "default" and an 3872/// expression (in which case it is known as a default generic association). 3873/// The type and value of the generic selection are identical to those of its 3874/// result expression, which is defined as the expression in the generic 3875/// association with a type name that is compatible with the type of the 3876/// controlling expression, or the expression in the default generic association 3877/// if no types are compatible. For example: 3878/// 3879/// @code 3880/// _Generic(X, double: 1, float: 2, default: 3) 3881/// @endcode 3882/// 3883/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 3884/// or 3 if "hello". 3885/// 3886/// As an extension, generic selections are allowed in C++, where the following 3887/// additional semantics apply: 3888/// 3889/// Any generic selection whose controlling expression is type-dependent or 3890/// which names a dependent type in its association list is result-dependent, 3891/// which means that the choice of result expression is dependent. 3892/// Result-dependent generic associations are both type- and value-dependent. 3893class GenericSelectionExpr : public Expr { 3894 enum { CONTROLLING, END_EXPR }; 3895 TypeSourceInfo **AssocTypes; 3896 Stmt **SubExprs; 3897 unsigned NumAssocs, ResultIndex; 3898 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 3899 3900public: 3901 GenericSelectionExpr(ASTContext &Context, 3902 SourceLocation GenericLoc, Expr *ControllingExpr, 3903 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3904 unsigned NumAssocs, SourceLocation DefaultLoc, 3905 SourceLocation RParenLoc, 3906 bool ContainsUnexpandedParameterPack, 3907 unsigned ResultIndex); 3908 3909 /// This constructor is used in the result-dependent case. 3910 GenericSelectionExpr(ASTContext &Context, 3911 SourceLocation GenericLoc, Expr *ControllingExpr, 3912 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3913 unsigned NumAssocs, SourceLocation DefaultLoc, 3914 SourceLocation RParenLoc, 3915 bool ContainsUnexpandedParameterPack); 3916 3917 explicit GenericSelectionExpr(EmptyShell Empty) 3918 : Expr(GenericSelectionExprClass, Empty) { } 3919 3920 unsigned getNumAssocs() const { return NumAssocs; } 3921 3922 SourceLocation getGenericLoc() const { return GenericLoc; } 3923 SourceLocation getDefaultLoc() const { return DefaultLoc; } 3924 SourceLocation getRParenLoc() const { return RParenLoc; } 3925 3926 const Expr *getAssocExpr(unsigned i) const { 3927 return cast<Expr>(SubExprs[END_EXPR+i]); 3928 } 3929 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 3930 3931 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 3932 return AssocTypes[i]; 3933 } 3934 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 3935 3936 QualType getAssocType(unsigned i) const { 3937 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 3938 return TS->getType(); 3939 else 3940 return QualType(); 3941 } 3942 3943 const Expr *getControllingExpr() const { 3944 return cast<Expr>(SubExprs[CONTROLLING]); 3945 } 3946 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 3947 3948 /// Whether this generic selection is result-dependent. 3949 bool isResultDependent() const { return ResultIndex == -1U; } 3950 3951 /// The zero-based index of the result expression's generic association in 3952 /// the generic selection's association list. Defined only if the 3953 /// generic selection is not result-dependent. 3954 unsigned getResultIndex() const { 3955 assert(!isResultDependent() && "Generic selection is result-dependent"); 3956 return ResultIndex; 3957 } 3958 3959 /// The generic selection's result expression. Defined only if the 3960 /// generic selection is not result-dependent. 3961 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 3962 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 3963 3964 SourceRange getSourceRange() const { 3965 return SourceRange(GenericLoc, RParenLoc); 3966 } 3967 static bool classof(const Stmt *T) { 3968 return T->getStmtClass() == GenericSelectionExprClass; 3969 } 3970 static bool classof(const GenericSelectionExpr *) { return true; } 3971 3972 child_range children() { 3973 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 3974 } 3975 3976 friend class ASTStmtReader; 3977}; 3978 3979//===----------------------------------------------------------------------===// 3980// Clang Extensions 3981//===----------------------------------------------------------------------===// 3982 3983 3984/// ExtVectorElementExpr - This represents access to specific elements of a 3985/// vector, and may occur on the left hand side or right hand side. For example 3986/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3987/// 3988/// Note that the base may have either vector or pointer to vector type, just 3989/// like a struct field reference. 3990/// 3991class ExtVectorElementExpr : public Expr { 3992 Stmt *Base; 3993 IdentifierInfo *Accessor; 3994 SourceLocation AccessorLoc; 3995public: 3996 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 3997 IdentifierInfo &accessor, SourceLocation loc) 3998 : Expr(ExtVectorElementExprClass, ty, VK, 3999 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4000 base->isTypeDependent(), base->isValueDependent(), 4001 base->isInstantiationDependent(), 4002 base->containsUnexpandedParameterPack()), 4003 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4004 4005 /// \brief Build an empty vector element expression. 4006 explicit ExtVectorElementExpr(EmptyShell Empty) 4007 : Expr(ExtVectorElementExprClass, Empty) { } 4008 4009 const Expr *getBase() const { return cast<Expr>(Base); } 4010 Expr *getBase() { return cast<Expr>(Base); } 4011 void setBase(Expr *E) { Base = E; } 4012 4013 IdentifierInfo &getAccessor() const { return *Accessor; } 4014 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4015 4016 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4017 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4018 4019 /// getNumElements - Get the number of components being selected. 4020 unsigned getNumElements() const; 4021 4022 /// containsDuplicateElements - Return true if any element access is 4023 /// repeated. 4024 bool containsDuplicateElements() const; 4025 4026 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4027 /// aggregate Constant of ConstantInt(s). 4028 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 4029 4030 SourceRange getSourceRange() const { 4031 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4032 } 4033 4034 /// isArrow - Return true if the base expression is a pointer to vector, 4035 /// return false if the base expression is a vector. 4036 bool isArrow() const; 4037 4038 static bool classof(const Stmt *T) { 4039 return T->getStmtClass() == ExtVectorElementExprClass; 4040 } 4041 static bool classof(const ExtVectorElementExpr *) { return true; } 4042 4043 // Iterators 4044 child_range children() { return child_range(&Base, &Base+1); } 4045}; 4046 4047 4048/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4049/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4050class BlockExpr : public Expr { 4051protected: 4052 BlockDecl *TheBlock; 4053public: 4054 BlockExpr(BlockDecl *BD, QualType ty) 4055 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4056 ty->isDependentType(), false, 4057 // FIXME: Check for instantiate-dependence in the statement? 4058 ty->isInstantiationDependentType(), 4059 false), 4060 TheBlock(BD) {} 4061 4062 /// \brief Build an empty block expression. 4063 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4064 4065 const BlockDecl *getBlockDecl() const { return TheBlock; } 4066 BlockDecl *getBlockDecl() { return TheBlock; } 4067 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4068 4069 // Convenience functions for probing the underlying BlockDecl. 4070 SourceLocation getCaretLocation() const; 4071 const Stmt *getBody() const; 4072 Stmt *getBody(); 4073 4074 SourceRange getSourceRange() const { 4075 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4076 } 4077 4078 /// getFunctionType - Return the underlying function type for this block. 4079 const FunctionType *getFunctionType() const; 4080 4081 static bool classof(const Stmt *T) { 4082 return T->getStmtClass() == BlockExprClass; 4083 } 4084 static bool classof(const BlockExpr *) { return true; } 4085 4086 // Iterators 4087 child_range children() { return child_range(); } 4088}; 4089 4090/// BlockDeclRefExpr - A reference to a local variable declared in an 4091/// enclosing scope. 4092class BlockDeclRefExpr : public Expr { 4093 VarDecl *D; 4094 SourceLocation Loc; 4095 bool IsByRef : 1; 4096 bool ConstQualAdded : 1; 4097public: 4098 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 4099 SourceLocation l, bool ByRef, bool constAdded = false); 4100 4101 // \brief Build an empty reference to a declared variable in a 4102 // block. 4103 explicit BlockDeclRefExpr(EmptyShell Empty) 4104 : Expr(BlockDeclRefExprClass, Empty) { } 4105 4106 VarDecl *getDecl() { return D; } 4107 const VarDecl *getDecl() const { return D; } 4108 void setDecl(VarDecl *VD) { D = VD; } 4109 4110 SourceLocation getLocation() const { return Loc; } 4111 void setLocation(SourceLocation L) { Loc = L; } 4112 4113 SourceRange getSourceRange() const { return SourceRange(Loc); } 4114 4115 bool isByRef() const { return IsByRef; } 4116 void setByRef(bool BR) { IsByRef = BR; } 4117 4118 bool isConstQualAdded() const { return ConstQualAdded; } 4119 void setConstQualAdded(bool C) { ConstQualAdded = C; } 4120 4121 static bool classof(const Stmt *T) { 4122 return T->getStmtClass() == BlockDeclRefExprClass; 4123 } 4124 static bool classof(const BlockDeclRefExpr *) { return true; } 4125 4126 // Iterators 4127 child_range children() { return child_range(); } 4128}; 4129 4130/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4131/// This AST node provides support for reinterpreting a type to another 4132/// type of the same size. 4133class AsTypeExpr : public Expr { 4134private: 4135 Expr* SrcExpr; 4136 QualType DstType; 4137 SourceLocation BuiltinLoc, RParenLoc; 4138 4139public: 4140 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4141 ExprValueKind VK, ExprObjectKind OK, 4142 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4143 : Expr(AsTypeExprClass, DstType, VK, OK, 4144 DstType->isDependentType(), 4145 DstType->isDependentType() || SrcExpr->isValueDependent(), 4146 (DstType->isInstantiationDependentType() || 4147 SrcExpr->isInstantiationDependent()), 4148 (DstType->containsUnexpandedParameterPack() || 4149 SrcExpr->containsUnexpandedParameterPack())), 4150 SrcExpr(SrcExpr), DstType(DstType), 4151 BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4152 4153 /// \brief Build an empty __builtin_astype 4154 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4155 4156 /// getSrcExpr - Return the Expr to be converted. 4157 Expr *getSrcExpr() const { return SrcExpr; } 4158 QualType getDstType() const { return DstType; } 4159 4160 SourceRange getSourceRange() const { 4161 return SourceRange(BuiltinLoc, RParenLoc); 4162 } 4163 4164 static bool classof(const Stmt *T) { 4165 return T->getStmtClass() == AsTypeExprClass; 4166 } 4167 static bool classof(const AsTypeExpr *) { return true; } 4168 4169 // Iterators 4170 child_range children() { return child_range(); } 4171}; 4172} // end namespace clang 4173 4174#endif 4175