Expr.h revision 276b061970939293f1abaf694bd3ef05b2cbda79
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "clang/AST/DeclAccessPair.h" 21#include "clang/AST/OperationKinds.h" 22#include "clang/AST/ASTVector.h" 23#include "clang/AST/TemplateBase.h" 24#include "clang/AST/UsuallyTinyPtrVector.h" 25#include "clang/Basic/TypeTraits.h" 26#include "llvm/ADT/APSInt.h" 27#include "llvm/ADT/APFloat.h" 28#include "llvm/ADT/SmallVector.h" 29#include "llvm/ADT/StringRef.h" 30#include <cctype> 31 32namespace clang { 33 class ASTContext; 34 class APValue; 35 class Decl; 36 class IdentifierInfo; 37 class ParmVarDecl; 38 class NamedDecl; 39 class ValueDecl; 40 class BlockDecl; 41 class CXXBaseSpecifier; 42 class CXXOperatorCallExpr; 43 class CXXMemberCallExpr; 44 class ObjCPropertyRefExpr; 45 class OpaqueValueExpr; 46 47/// \brief A simple array of base specifiers. 48typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 49 50/// Expr - This represents one expression. Note that Expr's are subclasses of 51/// Stmt. This allows an expression to be transparently used any place a Stmt 52/// is required. 53/// 54class Expr : public Stmt { 55 QualType TR; 56 57protected: 58 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 59 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 60 : Stmt(SC) 61 { 62 ExprBits.TypeDependent = TD; 63 ExprBits.ValueDependent = VD; 64 ExprBits.InstantiationDependent = ID; 65 ExprBits.ValueKind = VK; 66 ExprBits.ObjectKind = OK; 67 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 68 setType(T); 69 } 70 71 /// \brief Construct an empty expression. 72 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 73 74public: 75 QualType getType() const { return TR; } 76 void setType(QualType t) { 77 // In C++, the type of an expression is always adjusted so that it 78 // will not have reference type an expression will never have 79 // reference type (C++ [expr]p6). Use 80 // QualType::getNonReferenceType() to retrieve the non-reference 81 // type. Additionally, inspect Expr::isLvalue to determine whether 82 // an expression that is adjusted in this manner should be 83 // considered an lvalue. 84 assert((t.isNull() || !t->isReferenceType()) && 85 "Expressions can't have reference type"); 86 87 TR = t; 88 } 89 90 /// isValueDependent - Determines whether this expression is 91 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 92 /// array bound of "Chars" in the following example is 93 /// value-dependent. 94 /// @code 95 /// template<int Size, char (&Chars)[Size]> struct meta_string; 96 /// @endcode 97 bool isValueDependent() const { return ExprBits.ValueDependent; } 98 99 /// \brief Set whether this expression is value-dependent or not. 100 void setValueDependent(bool VD) { 101 ExprBits.ValueDependent = VD; 102 if (VD) 103 ExprBits.InstantiationDependent = true; 104 } 105 106 /// isTypeDependent - Determines whether this expression is 107 /// type-dependent (C++ [temp.dep.expr]), which means that its type 108 /// could change from one template instantiation to the next. For 109 /// example, the expressions "x" and "x + y" are type-dependent in 110 /// the following code, but "y" is not type-dependent: 111 /// @code 112 /// template<typename T> 113 /// void add(T x, int y) { 114 /// x + y; 115 /// } 116 /// @endcode 117 bool isTypeDependent() const { return ExprBits.TypeDependent; } 118 119 /// \brief Set whether this expression is type-dependent or not. 120 void setTypeDependent(bool TD) { 121 ExprBits.TypeDependent = TD; 122 if (TD) 123 ExprBits.InstantiationDependent = true; 124 } 125 126 /// \brief Whether this expression is instantiation-dependent, meaning that 127 /// it depends in some way on a template parameter, even if neither its type 128 /// nor (constant) value can change due to the template instantiation. 129 /// 130 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 131 /// instantiation-dependent (since it involves a template parameter \c T), but 132 /// is neither type- nor value-dependent, since the type of the inner 133 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 134 /// \c sizeof is known. 135 /// 136 /// \code 137 /// template<typename T> 138 /// void f(T x, T y) { 139 /// sizeof(sizeof(T() + T()); 140 /// } 141 /// \endcode 142 /// 143 bool isInstantiationDependent() const { 144 return ExprBits.InstantiationDependent; 145 } 146 147 /// \brief Set whether this expression is instantiation-dependent or not. 148 void setInstantiationDependent(bool ID) { 149 ExprBits.InstantiationDependent = ID; 150 } 151 152 /// \brief Whether this expression contains an unexpanded parameter 153 /// pack (for C++0x variadic templates). 154 /// 155 /// Given the following function template: 156 /// 157 /// \code 158 /// template<typename F, typename ...Types> 159 /// void forward(const F &f, Types &&...args) { 160 /// f(static_cast<Types&&>(args)...); 161 /// } 162 /// \endcode 163 /// 164 /// The expressions \c args and \c static_cast<Types&&>(args) both 165 /// contain parameter packs. 166 bool containsUnexpandedParameterPack() const { 167 return ExprBits.ContainsUnexpandedParameterPack; 168 } 169 170 /// \brief Set the bit that describes whether this expression 171 /// contains an unexpanded parameter pack. 172 void setContainsUnexpandedParameterPack(bool PP = true) { 173 ExprBits.ContainsUnexpandedParameterPack = PP; 174 } 175 176 /// getExprLoc - Return the preferred location for the arrow when diagnosing 177 /// a problem with a generic expression. 178 SourceLocation getExprLoc() const; 179 180 /// isUnusedResultAWarning - Return true if this immediate expression should 181 /// be warned about if the result is unused. If so, fill in Loc and Ranges 182 /// with location to warn on and the source range[s] to report with the 183 /// warning. 184 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 185 SourceRange &R2, ASTContext &Ctx) const; 186 187 /// isLValue - True if this expression is an "l-value" according to 188 /// the rules of the current language. C and C++ give somewhat 189 /// different rules for this concept, but in general, the result of 190 /// an l-value expression identifies a specific object whereas the 191 /// result of an r-value expression is a value detached from any 192 /// specific storage. 193 /// 194 /// C++0x divides the concept of "r-value" into pure r-values 195 /// ("pr-values") and so-called expiring values ("x-values"), which 196 /// identify specific objects that can be safely cannibalized for 197 /// their resources. This is an unfortunate abuse of terminology on 198 /// the part of the C++ committee. In Clang, when we say "r-value", 199 /// we generally mean a pr-value. 200 bool isLValue() const { return getValueKind() == VK_LValue; } 201 bool isRValue() const { return getValueKind() == VK_RValue; } 202 bool isXValue() const { return getValueKind() == VK_XValue; } 203 bool isGLValue() const { return getValueKind() != VK_RValue; } 204 205 enum LValueClassification { 206 LV_Valid, 207 LV_NotObjectType, 208 LV_IncompleteVoidType, 209 LV_DuplicateVectorComponents, 210 LV_InvalidExpression, 211 LV_InvalidMessageExpression, 212 LV_MemberFunction, 213 LV_SubObjCPropertySetting, 214 LV_ClassTemporary 215 }; 216 /// Reasons why an expression might not be an l-value. 217 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 218 219 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 220 /// does not have an incomplete type, does not have a const-qualified type, 221 /// and if it is a structure or union, does not have any member (including, 222 /// recursively, any member or element of all contained aggregates or unions) 223 /// with a const-qualified type. 224 /// 225 /// \param Loc [in] [out] - A source location which *may* be filled 226 /// in with the location of the expression making this a 227 /// non-modifiable lvalue, if specified. 228 enum isModifiableLvalueResult { 229 MLV_Valid, 230 MLV_NotObjectType, 231 MLV_IncompleteVoidType, 232 MLV_DuplicateVectorComponents, 233 MLV_InvalidExpression, 234 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 235 MLV_IncompleteType, 236 MLV_ConstQualified, 237 MLV_ArrayType, 238 MLV_NotBlockQualified, 239 MLV_ReadonlyProperty, 240 MLV_NoSetterProperty, 241 MLV_MemberFunction, 242 MLV_SubObjCPropertySetting, 243 MLV_InvalidMessageExpression, 244 MLV_ClassTemporary 245 }; 246 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 247 SourceLocation *Loc = 0) const; 248 249 /// \brief The return type of classify(). Represents the C++0x expression 250 /// taxonomy. 251 class Classification { 252 public: 253 /// \brief The various classification results. Most of these mean prvalue. 254 enum Kinds { 255 CL_LValue, 256 CL_XValue, 257 CL_Function, // Functions cannot be lvalues in C. 258 CL_Void, // Void cannot be an lvalue in C. 259 CL_AddressableVoid, // Void expression whose address can be taken in C. 260 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 261 CL_MemberFunction, // An expression referring to a member function 262 CL_SubObjCPropertySetting, 263 CL_ClassTemporary, // A prvalue of class type 264 CL_ObjCMessageRValue, // ObjC message is an rvalue 265 CL_PRValue // A prvalue for any other reason, of any other type 266 }; 267 /// \brief The results of modification testing. 268 enum ModifiableType { 269 CM_Untested, // testModifiable was false. 270 CM_Modifiable, 271 CM_RValue, // Not modifiable because it's an rvalue 272 CM_Function, // Not modifiable because it's a function; C++ only 273 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 274 CM_NotBlockQualified, // Not captured in the closure 275 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 276 CM_ConstQualified, 277 CM_ArrayType, 278 CM_IncompleteType 279 }; 280 281 private: 282 friend class Expr; 283 284 unsigned short Kind; 285 unsigned short Modifiable; 286 287 explicit Classification(Kinds k, ModifiableType m) 288 : Kind(k), Modifiable(m) 289 {} 290 291 public: 292 Classification() {} 293 294 Kinds getKind() const { return static_cast<Kinds>(Kind); } 295 ModifiableType getModifiable() const { 296 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 297 return static_cast<ModifiableType>(Modifiable); 298 } 299 bool isLValue() const { return Kind == CL_LValue; } 300 bool isXValue() const { return Kind == CL_XValue; } 301 bool isGLValue() const { return Kind <= CL_XValue; } 302 bool isPRValue() const { return Kind >= CL_Function; } 303 bool isRValue() const { return Kind >= CL_XValue; } 304 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 305 306 /// \brief Create a simple, modifiably lvalue 307 static Classification makeSimpleLValue() { 308 return Classification(CL_LValue, CM_Modifiable); 309 } 310 311 }; 312 /// \brief Classify - Classify this expression according to the C++0x 313 /// expression taxonomy. 314 /// 315 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 316 /// old lvalue vs rvalue. This function determines the type of expression this 317 /// is. There are three expression types: 318 /// - lvalues are classical lvalues as in C++03. 319 /// - prvalues are equivalent to rvalues in C++03. 320 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 321 /// function returning an rvalue reference. 322 /// lvalues and xvalues are collectively referred to as glvalues, while 323 /// prvalues and xvalues together form rvalues. 324 Classification Classify(ASTContext &Ctx) const { 325 return ClassifyImpl(Ctx, 0); 326 } 327 328 /// \brief ClassifyModifiable - Classify this expression according to the 329 /// C++0x expression taxonomy, and see if it is valid on the left side 330 /// of an assignment. 331 /// 332 /// This function extends classify in that it also tests whether the 333 /// expression is modifiable (C99 6.3.2.1p1). 334 /// \param Loc A source location that might be filled with a relevant location 335 /// if the expression is not modifiable. 336 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 337 return ClassifyImpl(Ctx, &Loc); 338 } 339 340 /// getValueKindForType - Given a formal return or parameter type, 341 /// give its value kind. 342 static ExprValueKind getValueKindForType(QualType T) { 343 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 344 return (isa<LValueReferenceType>(RT) 345 ? VK_LValue 346 : (RT->getPointeeType()->isFunctionType() 347 ? VK_LValue : VK_XValue)); 348 return VK_RValue; 349 } 350 351 /// getValueKind - The value kind that this expression produces. 352 ExprValueKind getValueKind() const { 353 return static_cast<ExprValueKind>(ExprBits.ValueKind); 354 } 355 356 /// getObjectKind - The object kind that this expression produces. 357 /// Object kinds are meaningful only for expressions that yield an 358 /// l-value or x-value. 359 ExprObjectKind getObjectKind() const { 360 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 361 } 362 363 bool isOrdinaryOrBitFieldObject() const { 364 ExprObjectKind OK = getObjectKind(); 365 return (OK == OK_Ordinary || OK == OK_BitField); 366 } 367 368 /// setValueKind - Set the value kind produced by this expression. 369 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 370 371 /// setObjectKind - Set the object kind produced by this expression. 372 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 373 374private: 375 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 376 377public: 378 379 /// \brief If this expression refers to a bit-field, retrieve the 380 /// declaration of that bit-field. 381 FieldDecl *getBitField(); 382 383 const FieldDecl *getBitField() const { 384 return const_cast<Expr*>(this)->getBitField(); 385 } 386 387 /// \brief If this expression is an l-value for an Objective C 388 /// property, find the underlying property reference expression. 389 const ObjCPropertyRefExpr *getObjCProperty() const; 390 391 /// \brief Returns whether this expression refers to a vector element. 392 bool refersToVectorElement() const; 393 394 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 395 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 396 /// but also int expressions which are produced by things like comparisons in 397 /// C. 398 bool isKnownToHaveBooleanValue() const; 399 400 /// isIntegerConstantExpr - Return true if this expression is a valid integer 401 /// constant expression, and, if so, return its value in Result. If not a 402 /// valid i-c-e, return false and fill in Loc (if specified) with the location 403 /// of the invalid expression. 404 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 405 SourceLocation *Loc = 0, 406 bool isEvaluated = true) const; 407 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 408 llvm::APSInt X; 409 return isIntegerConstantExpr(X, Ctx, Loc); 410 } 411 /// isConstantInitializer - Returns true if this expression is a constant 412 /// initializer, which can be emitted at compile-time. 413 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 414 415 /// EvalResult is a struct with detailed info about an evaluated expression. 416 struct EvalResult { 417 /// Val - This is the value the expression can be folded to. 418 APValue Val; 419 420 /// HasSideEffects - Whether the evaluated expression has side effects. 421 /// For example, (f() && 0) can be folded, but it still has side effects. 422 bool HasSideEffects; 423 424 /// Diag - If the expression is unfoldable, then Diag contains a note 425 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 426 /// position for the error, and DiagExpr is the expression that caused 427 /// the error. 428 /// If the expression is foldable, but not an integer constant expression, 429 /// Diag contains a note diagnostic that describes why it isn't an integer 430 /// constant expression. If the expression *is* an integer constant 431 /// expression, then Diag will be zero. 432 unsigned Diag; 433 const Expr *DiagExpr; 434 SourceLocation DiagLoc; 435 436 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 437 438 // isGlobalLValue - Return true if the evaluated lvalue expression 439 // is global. 440 bool isGlobalLValue() const; 441 // hasSideEffects - Return true if the evaluated expression has 442 // side effects. 443 bool hasSideEffects() const { 444 return HasSideEffects; 445 } 446 }; 447 448 /// Evaluate - Return true if this is a constant which we can fold using 449 /// any crazy technique (that has nothing to do with language standards) that 450 /// we want to. If this function returns true, it returns the folded constant 451 /// in Result. 452 bool Evaluate(EvalResult &Result, const ASTContext &Ctx) const; 453 454 /// EvaluateAsBooleanCondition - Return true if this is a constant 455 /// which we we can fold and convert to a boolean condition using 456 /// any crazy technique that we want to, even if the expression has 457 /// side-effects. 458 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 459 460 /// EvaluateAsInt - Return true if this is a constant which we can fold and 461 /// convert to an integer using any crazy technique that we want to. 462 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx) const; 463 464 /// isEvaluatable - Call Evaluate to see if this expression can be constant 465 /// folded, but discard the result. 466 bool isEvaluatable(const ASTContext &Ctx) const; 467 468 /// HasSideEffects - This routine returns true for all those expressions 469 /// which must be evaluated each time and must not be optimized away 470 /// or evaluated at compile time. Example is a function call, volatile 471 /// variable read. 472 bool HasSideEffects(const ASTContext &Ctx) const; 473 474 /// EvaluateKnownConstInt - Call Evaluate and return the folded integer. This 475 /// must be called on an expression that constant folds to an integer. 476 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 477 478 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 479 /// with link time known address. 480 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 481 482 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue. 483 bool EvaluateAsAnyLValue(EvalResult &Result, const ASTContext &Ctx) const; 484 485 /// \brief Enumeration used to describe the kind of Null pointer constant 486 /// returned from \c isNullPointerConstant(). 487 enum NullPointerConstantKind { 488 /// \brief Expression is not a Null pointer constant. 489 NPCK_NotNull = 0, 490 491 /// \brief Expression is a Null pointer constant built from a zero integer. 492 NPCK_ZeroInteger, 493 494 /// \brief Expression is a C++0X nullptr. 495 NPCK_CXX0X_nullptr, 496 497 /// \brief Expression is a GNU-style __null constant. 498 NPCK_GNUNull 499 }; 500 501 /// \brief Enumeration used to describe how \c isNullPointerConstant() 502 /// should cope with value-dependent expressions. 503 enum NullPointerConstantValueDependence { 504 /// \brief Specifies that the expression should never be value-dependent. 505 NPC_NeverValueDependent = 0, 506 507 /// \brief Specifies that a value-dependent expression of integral or 508 /// dependent type should be considered a null pointer constant. 509 NPC_ValueDependentIsNull, 510 511 /// \brief Specifies that a value-dependent expression should be considered 512 /// to never be a null pointer constant. 513 NPC_ValueDependentIsNotNull 514 }; 515 516 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 517 /// a Null pointer constant. The return value can further distinguish the 518 /// kind of NULL pointer constant that was detected. 519 NullPointerConstantKind isNullPointerConstant( 520 ASTContext &Ctx, 521 NullPointerConstantValueDependence NPC) const; 522 523 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 524 /// write barrier. 525 bool isOBJCGCCandidate(ASTContext &Ctx) const; 526 527 /// \brief Returns true if this expression is a bound member function. 528 bool isBoundMemberFunction(ASTContext &Ctx) const; 529 530 /// \brief Given an expression of bound-member type, find the type 531 /// of the member. Returns null if this is an *overloaded* bound 532 /// member expression. 533 static QualType findBoundMemberType(const Expr *expr); 534 535 /// \brief Result type of CanThrow(). 536 enum CanThrowResult { 537 CT_Cannot, 538 CT_Dependent, 539 CT_Can 540 }; 541 /// \brief Test if this expression, if evaluated, might throw, according to 542 /// the rules of C++ [expr.unary.noexcept]. 543 CanThrowResult CanThrow(ASTContext &C) const; 544 545 /// IgnoreImpCasts - Skip past any implicit casts which might 546 /// surround this expression. Only skips ImplicitCastExprs. 547 Expr *IgnoreImpCasts(); 548 549 /// IgnoreImplicit - Skip past any implicit AST nodes which might 550 /// surround this expression. 551 Expr *IgnoreImplicit() { return cast<Expr>(Stmt::IgnoreImplicit()); } 552 553 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 554 /// its subexpression. If that subexpression is also a ParenExpr, 555 /// then this method recursively returns its subexpression, and so forth. 556 /// Otherwise, the method returns the current Expr. 557 Expr *IgnoreParens(); 558 559 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 560 /// or CastExprs, returning their operand. 561 Expr *IgnoreParenCasts(); 562 563 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 564 /// ParenExpr or ImplicitCastExprs, returning their operand. 565 Expr *IgnoreParenImpCasts(); 566 567 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 568 /// call to a conversion operator, return the argument. 569 Expr *IgnoreConversionOperator(); 570 571 const Expr *IgnoreConversionOperator() const { 572 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 573 } 574 575 const Expr *IgnoreParenImpCasts() const { 576 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 577 } 578 579 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 580 /// CastExprs that represent lvalue casts, returning their operand. 581 Expr *IgnoreParenLValueCasts(); 582 583 const Expr *IgnoreParenLValueCasts() const { 584 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 585 } 586 587 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 588 /// value (including ptr->int casts of the same size). Strip off any 589 /// ParenExpr or CastExprs, returning their operand. 590 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 591 592 /// \brief Determine whether this expression is a default function argument. 593 /// 594 /// Default arguments are implicitly generated in the abstract syntax tree 595 /// by semantic analysis for function calls, object constructions, etc. in 596 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 597 /// this routine also looks through any implicit casts to determine whether 598 /// the expression is a default argument. 599 bool isDefaultArgument() const; 600 601 /// \brief Determine whether the result of this expression is a 602 /// temporary object of the given class type. 603 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 604 605 /// \brief Whether this expression is an implicit reference to 'this' in C++. 606 bool isImplicitCXXThis() const; 607 608 const Expr *IgnoreImpCasts() const { 609 return const_cast<Expr*>(this)->IgnoreImpCasts(); 610 } 611 const Expr *IgnoreParens() const { 612 return const_cast<Expr*>(this)->IgnoreParens(); 613 } 614 const Expr *IgnoreParenCasts() const { 615 return const_cast<Expr*>(this)->IgnoreParenCasts(); 616 } 617 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 618 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 619 } 620 621 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 622 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 623 624 static bool classof(const Stmt *T) { 625 return T->getStmtClass() >= firstExprConstant && 626 T->getStmtClass() <= lastExprConstant; 627 } 628 static bool classof(const Expr *) { return true; } 629}; 630 631 632//===----------------------------------------------------------------------===// 633// Primary Expressions. 634//===----------------------------------------------------------------------===// 635 636/// OpaqueValueExpr - An expression referring to an opaque object of a 637/// fixed type and value class. These don't correspond to concrete 638/// syntax; instead they're used to express operations (usually copy 639/// operations) on values whose source is generally obvious from 640/// context. 641class OpaqueValueExpr : public Expr { 642 friend class ASTStmtReader; 643 Expr *SourceExpr; 644 SourceLocation Loc; 645 646public: 647 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 648 ExprObjectKind OK = OK_Ordinary) 649 : Expr(OpaqueValueExprClass, T, VK, OK, 650 T->isDependentType(), T->isDependentType(), 651 T->isInstantiationDependentType(), 652 false), 653 SourceExpr(0), Loc(Loc) { 654 } 655 656 /// Given an expression which invokes a copy constructor --- i.e. a 657 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 658 /// find the OpaqueValueExpr that's the source of the construction. 659 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 660 661 explicit OpaqueValueExpr(EmptyShell Empty) 662 : Expr(OpaqueValueExprClass, Empty) { } 663 664 /// \brief Retrieve the location of this expression. 665 SourceLocation getLocation() const { return Loc; } 666 667 SourceRange getSourceRange() const { 668 if (SourceExpr) return SourceExpr->getSourceRange(); 669 return Loc; 670 } 671 SourceLocation getExprLoc() const { 672 if (SourceExpr) return SourceExpr->getExprLoc(); 673 return Loc; 674 } 675 676 child_range children() { return child_range(); } 677 678 /// The source expression of an opaque value expression is the 679 /// expression which originally generated the value. This is 680 /// provided as a convenience for analyses that don't wish to 681 /// precisely model the execution behavior of the program. 682 /// 683 /// The source expression is typically set when building the 684 /// expression which binds the opaque value expression in the first 685 /// place. 686 Expr *getSourceExpr() const { return SourceExpr; } 687 void setSourceExpr(Expr *e) { SourceExpr = e; } 688 689 static bool classof(const Stmt *T) { 690 return T->getStmtClass() == OpaqueValueExprClass; 691 } 692 static bool classof(const OpaqueValueExpr *) { return true; } 693}; 694 695/// \brief A reference to a declared variable, function, enum, etc. 696/// [C99 6.5.1p2] 697/// 698/// This encodes all the information about how a declaration is referenced 699/// within an expression. 700/// 701/// There are several optional constructs attached to DeclRefExprs only when 702/// they apply in order to conserve memory. These are laid out past the end of 703/// the object, and flags in the DeclRefExprBitfield track whether they exist: 704/// 705/// DeclRefExprBits.HasQualifier: 706/// Specifies when this declaration reference expression has a C++ 707/// nested-name-specifier. 708/// DeclRefExprBits.HasFoundDecl: 709/// Specifies when this declaration reference expression has a record of 710/// a NamedDecl (different from the referenced ValueDecl) which was found 711/// during name lookup and/or overload resolution. 712/// DeclRefExprBits.HasExplicitTemplateArgs: 713/// Specifies when this declaration reference expression has an explicit 714/// C++ template argument list. 715class DeclRefExpr : public Expr { 716 /// \brief The declaration that we are referencing. 717 ValueDecl *D; 718 719 /// \brief The location of the declaration name itself. 720 SourceLocation Loc; 721 722 /// \brief Provides source/type location info for the declaration name 723 /// embedded in D. 724 DeclarationNameLoc DNLoc; 725 726 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 727 NestedNameSpecifierLoc &getInternalQualifierLoc() { 728 assert(hasQualifier()); 729 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 730 } 731 732 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 733 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 734 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 735 } 736 737 /// \brief Test whether there is a distinct FoundDecl attached to the end of 738 /// this DRE. 739 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 740 741 /// \brief Helper to retrieve the optional NamedDecl through which this 742 /// reference occured. 743 NamedDecl *&getInternalFoundDecl() { 744 assert(hasFoundDecl()); 745 if (hasQualifier()) 746 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 747 return *reinterpret_cast<NamedDecl **>(this + 1); 748 } 749 750 /// \brief Helper to retrieve the optional NamedDecl through which this 751 /// reference occured. 752 NamedDecl *getInternalFoundDecl() const { 753 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 754 } 755 756 DeclRefExpr(NestedNameSpecifierLoc QualifierLoc, 757 ValueDecl *D, const DeclarationNameInfo &NameInfo, 758 NamedDecl *FoundD, 759 const TemplateArgumentListInfo *TemplateArgs, 760 QualType T, ExprValueKind VK); 761 762 /// \brief Construct an empty declaration reference expression. 763 explicit DeclRefExpr(EmptyShell Empty) 764 : Expr(DeclRefExprClass, Empty) { } 765 766 /// \brief Computes the type- and value-dependence flags for this 767 /// declaration reference expression. 768 void computeDependence(); 769 770public: 771 DeclRefExpr(ValueDecl *D, QualType T, ExprValueKind VK, SourceLocation L, 772 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 773 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 774 D(D), Loc(L), DNLoc(LocInfo) { 775 DeclRefExprBits.HasQualifier = 0; 776 DeclRefExprBits.HasExplicitTemplateArgs = 0; 777 DeclRefExprBits.HasFoundDecl = 0; 778 DeclRefExprBits.HadMultipleCandidates = 0; 779 computeDependence(); 780 } 781 782 static DeclRefExpr *Create(ASTContext &Context, 783 NestedNameSpecifierLoc QualifierLoc, 784 ValueDecl *D, 785 SourceLocation NameLoc, 786 QualType T, ExprValueKind VK, 787 NamedDecl *FoundD = 0, 788 const TemplateArgumentListInfo *TemplateArgs = 0); 789 790 static DeclRefExpr *Create(ASTContext &Context, 791 NestedNameSpecifierLoc QualifierLoc, 792 ValueDecl *D, 793 const DeclarationNameInfo &NameInfo, 794 QualType T, ExprValueKind VK, 795 NamedDecl *FoundD = 0, 796 const TemplateArgumentListInfo *TemplateArgs = 0); 797 798 /// \brief Construct an empty declaration reference expression. 799 static DeclRefExpr *CreateEmpty(ASTContext &Context, 800 bool HasQualifier, 801 bool HasFoundDecl, 802 bool HasExplicitTemplateArgs, 803 unsigned NumTemplateArgs); 804 805 ValueDecl *getDecl() { return D; } 806 const ValueDecl *getDecl() const { return D; } 807 void setDecl(ValueDecl *NewD) { D = NewD; } 808 809 DeclarationNameInfo getNameInfo() const { 810 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 811 } 812 813 SourceLocation getLocation() const { return Loc; } 814 void setLocation(SourceLocation L) { Loc = L; } 815 SourceRange getSourceRange() const; 816 817 /// \brief Determine whether this declaration reference was preceded by a 818 /// C++ nested-name-specifier, e.g., \c N::foo. 819 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 820 821 /// \brief If the name was qualified, retrieves the nested-name-specifier 822 /// that precedes the name. Otherwise, returns NULL. 823 NestedNameSpecifier *getQualifier() const { 824 if (!hasQualifier()) 825 return 0; 826 827 return getInternalQualifierLoc().getNestedNameSpecifier(); 828 } 829 830 /// \brief If the name was qualified, retrieves the nested-name-specifier 831 /// that precedes the name, with source-location information. 832 NestedNameSpecifierLoc getQualifierLoc() const { 833 if (!hasQualifier()) 834 return NestedNameSpecifierLoc(); 835 836 return getInternalQualifierLoc(); 837 } 838 839 /// \brief Get the NamedDecl through which this reference occured. 840 /// 841 /// This Decl may be different from the ValueDecl actually referred to in the 842 /// presence of using declarations, etc. It always returns non-NULL, and may 843 /// simple return the ValueDecl when appropriate. 844 NamedDecl *getFoundDecl() { 845 return hasFoundDecl() ? getInternalFoundDecl() : D; 846 } 847 848 /// \brief Get the NamedDecl through which this reference occurred. 849 /// See non-const variant. 850 const NamedDecl *getFoundDecl() const { 851 return hasFoundDecl() ? getInternalFoundDecl() : D; 852 } 853 854 /// \brief Determines whether this declaration reference was followed by an 855 /// explict template argument list. 856 bool hasExplicitTemplateArgs() const { 857 return DeclRefExprBits.HasExplicitTemplateArgs; 858 } 859 860 /// \brief Retrieve the explicit template argument list that followed the 861 /// member template name. 862 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 863 assert(hasExplicitTemplateArgs()); 864 if (hasFoundDecl()) 865 return *reinterpret_cast<ASTTemplateArgumentListInfo *>( 866 &getInternalFoundDecl() + 1); 867 868 if (hasQualifier()) 869 return *reinterpret_cast<ASTTemplateArgumentListInfo *>( 870 &getInternalQualifierLoc() + 1); 871 872 return *reinterpret_cast<ASTTemplateArgumentListInfo *>(this + 1); 873 } 874 875 /// \brief Retrieve the explicit template argument list that followed the 876 /// member template name. 877 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 878 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 879 } 880 881 /// \brief Retrieves the optional explicit template arguments. 882 /// This points to the same data as getExplicitTemplateArgs(), but 883 /// returns null if there are no explicit template arguments. 884 const ASTTemplateArgumentListInfo *getExplicitTemplateArgsOpt() const { 885 if (!hasExplicitTemplateArgs()) return 0; 886 return &getExplicitTemplateArgs(); 887 } 888 889 /// \brief Copies the template arguments (if present) into the given 890 /// structure. 891 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 892 if (hasExplicitTemplateArgs()) 893 getExplicitTemplateArgs().copyInto(List); 894 } 895 896 /// \brief Retrieve the location of the left angle bracket following the 897 /// member name ('<'), if any. 898 SourceLocation getLAngleLoc() const { 899 if (!hasExplicitTemplateArgs()) 900 return SourceLocation(); 901 902 return getExplicitTemplateArgs().LAngleLoc; 903 } 904 905 /// \brief Retrieve the template arguments provided as part of this 906 /// template-id. 907 const TemplateArgumentLoc *getTemplateArgs() const { 908 if (!hasExplicitTemplateArgs()) 909 return 0; 910 911 return getExplicitTemplateArgs().getTemplateArgs(); 912 } 913 914 /// \brief Retrieve the number of template arguments provided as part of this 915 /// template-id. 916 unsigned getNumTemplateArgs() const { 917 if (!hasExplicitTemplateArgs()) 918 return 0; 919 920 return getExplicitTemplateArgs().NumTemplateArgs; 921 } 922 923 /// \brief Retrieve the location of the right angle bracket following the 924 /// template arguments ('>'). 925 SourceLocation getRAngleLoc() const { 926 if (!hasExplicitTemplateArgs()) 927 return SourceLocation(); 928 929 return getExplicitTemplateArgs().RAngleLoc; 930 } 931 932 /// \brief Returns true if this expression refers to a function that 933 /// was resolved from an overloaded set having size greater than 1. 934 bool hadMultipleCandidates() const { 935 return DeclRefExprBits.HadMultipleCandidates; 936 } 937 /// \brief Sets the flag telling whether this expression refers to 938 /// a function that was resolved from an overloaded set having size 939 /// greater than 1. 940 void setHadMultipleCandidates(bool V = true) { 941 DeclRefExprBits.HadMultipleCandidates = V; 942 } 943 944 static bool classof(const Stmt *T) { 945 return T->getStmtClass() == DeclRefExprClass; 946 } 947 static bool classof(const DeclRefExpr *) { return true; } 948 949 // Iterators 950 child_range children() { return child_range(); } 951 952 friend class ASTStmtReader; 953 friend class ASTStmtWriter; 954}; 955 956/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 957class PredefinedExpr : public Expr { 958public: 959 enum IdentType { 960 Func, 961 Function, 962 PrettyFunction, 963 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 964 /// 'virtual' keyword is omitted for virtual member functions. 965 PrettyFunctionNoVirtual 966 }; 967 968private: 969 SourceLocation Loc; 970 IdentType Type; 971public: 972 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 973 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 974 type->isDependentType(), type->isDependentType(), 975 type->isInstantiationDependentType(), 976 /*ContainsUnexpandedParameterPack=*/false), 977 Loc(l), Type(IT) {} 978 979 /// \brief Construct an empty predefined expression. 980 explicit PredefinedExpr(EmptyShell Empty) 981 : Expr(PredefinedExprClass, Empty) { } 982 983 IdentType getIdentType() const { return Type; } 984 void setIdentType(IdentType IT) { Type = IT; } 985 986 SourceLocation getLocation() const { return Loc; } 987 void setLocation(SourceLocation L) { Loc = L; } 988 989 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 990 991 SourceRange getSourceRange() const { return SourceRange(Loc); } 992 993 static bool classof(const Stmt *T) { 994 return T->getStmtClass() == PredefinedExprClass; 995 } 996 static bool classof(const PredefinedExpr *) { return true; } 997 998 // Iterators 999 child_range children() { return child_range(); } 1000}; 1001 1002/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1003/// leaking memory. 1004/// 1005/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1006/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1007/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1008/// the APFloat/APInt values will never get freed. APNumericStorage uses 1009/// ASTContext's allocator for memory allocation. 1010class APNumericStorage { 1011 unsigned BitWidth; 1012 union { 1013 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1014 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1015 }; 1016 1017 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1018 1019 APNumericStorage(const APNumericStorage&); // do not implement 1020 APNumericStorage& operator=(const APNumericStorage&); // do not implement 1021 1022protected: 1023 APNumericStorage() : BitWidth(0), VAL(0) { } 1024 1025 llvm::APInt getIntValue() const { 1026 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1027 if (NumWords > 1) 1028 return llvm::APInt(BitWidth, NumWords, pVal); 1029 else 1030 return llvm::APInt(BitWidth, VAL); 1031 } 1032 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1033}; 1034 1035class APIntStorage : public APNumericStorage { 1036public: 1037 llvm::APInt getValue() const { return getIntValue(); } 1038 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1039}; 1040 1041class APFloatStorage : public APNumericStorage { 1042public: 1043 llvm::APFloat getValue() const { return llvm::APFloat(getIntValue()); } 1044 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1045 setIntValue(C, Val.bitcastToAPInt()); 1046 } 1047}; 1048 1049class IntegerLiteral : public Expr { 1050 APIntStorage Num; 1051 SourceLocation Loc; 1052 1053 /// \brief Construct an empty integer literal. 1054 explicit IntegerLiteral(EmptyShell Empty) 1055 : Expr(IntegerLiteralClass, Empty) { } 1056 1057public: 1058 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1059 // or UnsignedLongLongTy 1060 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 1061 QualType type, SourceLocation l) 1062 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1063 false, false), 1064 Loc(l) { 1065 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 1066 assert(V.getBitWidth() == C.getIntWidth(type) && 1067 "Integer type is not the correct size for constant."); 1068 setValue(C, V); 1069 } 1070 1071 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1072 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1073 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1074 /// \param V - the value that the returned integer literal contains. 1075 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1076 QualType type, SourceLocation l); 1077 /// \brief Returns a new empty integer literal. 1078 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1079 1080 llvm::APInt getValue() const { return Num.getValue(); } 1081 SourceRange getSourceRange() const { return SourceRange(Loc); } 1082 1083 /// \brief Retrieve the location of the literal. 1084 SourceLocation getLocation() const { return Loc; } 1085 1086 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 1087 void setLocation(SourceLocation Location) { Loc = Location; } 1088 1089 static bool classof(const Stmt *T) { 1090 return T->getStmtClass() == IntegerLiteralClass; 1091 } 1092 static bool classof(const IntegerLiteral *) { return true; } 1093 1094 // Iterators 1095 child_range children() { return child_range(); } 1096}; 1097 1098class CharacterLiteral : public Expr { 1099public: 1100 enum CharacterKind { 1101 Ascii, 1102 Wide, 1103 UTF16, 1104 UTF32 1105 }; 1106 1107private: 1108 unsigned Value; 1109 SourceLocation Loc; 1110 unsigned Kind : 2; 1111public: 1112 // type should be IntTy 1113 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1114 SourceLocation l) 1115 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1116 false, false), 1117 Value(value), Loc(l), Kind(kind) { 1118 } 1119 1120 /// \brief Construct an empty character literal. 1121 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1122 1123 SourceLocation getLocation() const { return Loc; } 1124 CharacterKind getKind() const { return static_cast<CharacterKind>(Kind); } 1125 1126 SourceRange getSourceRange() const { return SourceRange(Loc); } 1127 1128 unsigned getValue() const { return Value; } 1129 1130 void setLocation(SourceLocation Location) { Loc = Location; } 1131 void setKind(CharacterKind kind) { Kind = kind; } 1132 void setValue(unsigned Val) { Value = Val; } 1133 1134 static bool classof(const Stmt *T) { 1135 return T->getStmtClass() == CharacterLiteralClass; 1136 } 1137 static bool classof(const CharacterLiteral *) { return true; } 1138 1139 // Iterators 1140 child_range children() { return child_range(); } 1141}; 1142 1143class FloatingLiteral : public Expr { 1144 APFloatStorage Num; 1145 bool IsExact : 1; 1146 SourceLocation Loc; 1147 1148 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1149 QualType Type, SourceLocation L) 1150 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1151 false, false), 1152 IsExact(isexact), Loc(L) { 1153 setValue(C, V); 1154 } 1155 1156 /// \brief Construct an empty floating-point literal. 1157 explicit FloatingLiteral(EmptyShell Empty) 1158 : Expr(FloatingLiteralClass, Empty), IsExact(false) { } 1159 1160public: 1161 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1162 bool isexact, QualType Type, SourceLocation L); 1163 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1164 1165 llvm::APFloat getValue() const { return Num.getValue(); } 1166 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1167 Num.setValue(C, Val); 1168 } 1169 1170 bool isExact() const { return IsExact; } 1171 void setExact(bool E) { IsExact = E; } 1172 1173 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1174 /// double. Note that this may cause loss of precision, but is useful for 1175 /// debugging dumps, etc. 1176 double getValueAsApproximateDouble() const; 1177 1178 SourceLocation getLocation() const { return Loc; } 1179 void setLocation(SourceLocation L) { Loc = L; } 1180 1181 SourceRange getSourceRange() const { return SourceRange(Loc); } 1182 1183 static bool classof(const Stmt *T) { 1184 return T->getStmtClass() == FloatingLiteralClass; 1185 } 1186 static bool classof(const FloatingLiteral *) { return true; } 1187 1188 // Iterators 1189 child_range children() { return child_range(); } 1190}; 1191 1192/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1193/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1194/// IntegerLiteral classes. Instances of this class always have a Complex type 1195/// whose element type matches the subexpression. 1196/// 1197class ImaginaryLiteral : public Expr { 1198 Stmt *Val; 1199public: 1200 ImaginaryLiteral(Expr *val, QualType Ty) 1201 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1202 false, false), 1203 Val(val) {} 1204 1205 /// \brief Build an empty imaginary literal. 1206 explicit ImaginaryLiteral(EmptyShell Empty) 1207 : Expr(ImaginaryLiteralClass, Empty) { } 1208 1209 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1210 Expr *getSubExpr() { return cast<Expr>(Val); } 1211 void setSubExpr(Expr *E) { Val = E; } 1212 1213 SourceRange getSourceRange() const { return Val->getSourceRange(); } 1214 static bool classof(const Stmt *T) { 1215 return T->getStmtClass() == ImaginaryLiteralClass; 1216 } 1217 static bool classof(const ImaginaryLiteral *) { return true; } 1218 1219 // Iterators 1220 child_range children() { return child_range(&Val, &Val+1); } 1221}; 1222 1223/// StringLiteral - This represents a string literal expression, e.g. "foo" 1224/// or L"bar" (wide strings). The actual string is returned by getStrData() 1225/// is NOT null-terminated, and the length of the string is determined by 1226/// calling getByteLength(). The C type for a string is always a 1227/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1228/// not. 1229/// 1230/// Note that strings in C can be formed by concatenation of multiple string 1231/// literal pptokens in translation phase #6. This keeps track of the locations 1232/// of each of these pieces. 1233/// 1234/// Strings in C can also be truncated and extended by assigning into arrays, 1235/// e.g. with constructs like: 1236/// char X[2] = "foobar"; 1237/// In this case, getByteLength() will return 6, but the string literal will 1238/// have type "char[2]". 1239class StringLiteral : public Expr { 1240public: 1241 enum StringKind { 1242 Ascii, 1243 Wide, 1244 UTF8, 1245 UTF16, 1246 UTF32 1247 }; 1248 1249private: 1250 friend class ASTStmtReader; 1251 1252 const char *StrData; 1253 unsigned ByteLength; 1254 unsigned NumConcatenated; 1255 unsigned Kind : 3; 1256 bool IsPascal : 1; 1257 SourceLocation TokLocs[1]; 1258 1259 StringLiteral(QualType Ty) : 1260 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1261 false) {} 1262 1263public: 1264 /// This is the "fully general" constructor that allows representation of 1265 /// strings formed from multiple concatenated tokens. 1266 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1267 bool Pascal, QualType Ty, 1268 const SourceLocation *Loc, unsigned NumStrs); 1269 1270 /// Simple constructor for string literals made from one token. 1271 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1272 bool Pascal, QualType Ty, 1273 SourceLocation Loc) { 1274 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1275 } 1276 1277 /// \brief Construct an empty string literal. 1278 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1279 1280 StringRef getString() const { 1281 return StringRef(StrData, ByteLength); 1282 } 1283 1284 unsigned getByteLength() const { return ByteLength; } 1285 1286 /// \brief Sets the string data to the given string data. 1287 void setString(ASTContext &C, StringRef Str); 1288 1289 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1290 bool isAscii() const { return Kind == Ascii; } 1291 bool isWide() const { return Kind == Wide; } 1292 bool isUTF8() const { return Kind == UTF8; } 1293 bool isUTF16() const { return Kind == UTF16; } 1294 bool isUTF32() const { return Kind == UTF32; } 1295 bool isPascal() const { return IsPascal; } 1296 1297 bool containsNonAsciiOrNull() const { 1298 StringRef Str = getString(); 1299 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1300 if (!isascii(Str[i]) || !Str[i]) 1301 return true; 1302 return false; 1303 } 1304 /// getNumConcatenated - Get the number of string literal tokens that were 1305 /// concatenated in translation phase #6 to form this string literal. 1306 unsigned getNumConcatenated() const { return NumConcatenated; } 1307 1308 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1309 assert(TokNum < NumConcatenated && "Invalid tok number"); 1310 return TokLocs[TokNum]; 1311 } 1312 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1313 assert(TokNum < NumConcatenated && "Invalid tok number"); 1314 TokLocs[TokNum] = L; 1315 } 1316 1317 /// getLocationOfByte - Return a source location that points to the specified 1318 /// byte of this string literal. 1319 /// 1320 /// Strings are amazingly complex. They can be formed from multiple tokens 1321 /// and can have escape sequences in them in addition to the usual trigraph 1322 /// and escaped newline business. This routine handles this complexity. 1323 /// 1324 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1325 const LangOptions &Features, 1326 const TargetInfo &Target) const; 1327 1328 typedef const SourceLocation *tokloc_iterator; 1329 tokloc_iterator tokloc_begin() const { return TokLocs; } 1330 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1331 1332 SourceRange getSourceRange() const { 1333 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1334 } 1335 static bool classof(const Stmt *T) { 1336 return T->getStmtClass() == StringLiteralClass; 1337 } 1338 static bool classof(const StringLiteral *) { return true; } 1339 1340 // Iterators 1341 child_range children() { return child_range(); } 1342}; 1343 1344/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1345/// AST node is only formed if full location information is requested. 1346class ParenExpr : public Expr { 1347 SourceLocation L, R; 1348 Stmt *Val; 1349public: 1350 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1351 : Expr(ParenExprClass, val->getType(), 1352 val->getValueKind(), val->getObjectKind(), 1353 val->isTypeDependent(), val->isValueDependent(), 1354 val->isInstantiationDependent(), 1355 val->containsUnexpandedParameterPack()), 1356 L(l), R(r), Val(val) {} 1357 1358 /// \brief Construct an empty parenthesized expression. 1359 explicit ParenExpr(EmptyShell Empty) 1360 : Expr(ParenExprClass, Empty) { } 1361 1362 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1363 Expr *getSubExpr() { return cast<Expr>(Val); } 1364 void setSubExpr(Expr *E) { Val = E; } 1365 1366 SourceRange getSourceRange() const { return SourceRange(L, R); } 1367 1368 /// \brief Get the location of the left parentheses '('. 1369 SourceLocation getLParen() const { return L; } 1370 void setLParen(SourceLocation Loc) { L = Loc; } 1371 1372 /// \brief Get the location of the right parentheses ')'. 1373 SourceLocation getRParen() const { return R; } 1374 void setRParen(SourceLocation Loc) { R = Loc; } 1375 1376 static bool classof(const Stmt *T) { 1377 return T->getStmtClass() == ParenExprClass; 1378 } 1379 static bool classof(const ParenExpr *) { return true; } 1380 1381 // Iterators 1382 child_range children() { return child_range(&Val, &Val+1); } 1383}; 1384 1385 1386/// UnaryOperator - This represents the unary-expression's (except sizeof and 1387/// alignof), the postinc/postdec operators from postfix-expression, and various 1388/// extensions. 1389/// 1390/// Notes on various nodes: 1391/// 1392/// Real/Imag - These return the real/imag part of a complex operand. If 1393/// applied to a non-complex value, the former returns its operand and the 1394/// later returns zero in the type of the operand. 1395/// 1396class UnaryOperator : public Expr { 1397public: 1398 typedef UnaryOperatorKind Opcode; 1399 1400private: 1401 unsigned Opc : 5; 1402 SourceLocation Loc; 1403 Stmt *Val; 1404public: 1405 1406 UnaryOperator(Expr *input, Opcode opc, QualType type, 1407 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1408 : Expr(UnaryOperatorClass, type, VK, OK, 1409 input->isTypeDependent() || type->isDependentType(), 1410 input->isValueDependent(), 1411 (input->isInstantiationDependent() || 1412 type->isInstantiationDependentType()), 1413 input->containsUnexpandedParameterPack()), 1414 Opc(opc), Loc(l), Val(input) {} 1415 1416 /// \brief Build an empty unary operator. 1417 explicit UnaryOperator(EmptyShell Empty) 1418 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1419 1420 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1421 void setOpcode(Opcode O) { Opc = O; } 1422 1423 Expr *getSubExpr() const { return cast<Expr>(Val); } 1424 void setSubExpr(Expr *E) { Val = E; } 1425 1426 /// getOperatorLoc - Return the location of the operator. 1427 SourceLocation getOperatorLoc() const { return Loc; } 1428 void setOperatorLoc(SourceLocation L) { Loc = L; } 1429 1430 /// isPostfix - Return true if this is a postfix operation, like x++. 1431 static bool isPostfix(Opcode Op) { 1432 return Op == UO_PostInc || Op == UO_PostDec; 1433 } 1434 1435 /// isPrefix - Return true if this is a prefix operation, like --x. 1436 static bool isPrefix(Opcode Op) { 1437 return Op == UO_PreInc || Op == UO_PreDec; 1438 } 1439 1440 bool isPrefix() const { return isPrefix(getOpcode()); } 1441 bool isPostfix() const { return isPostfix(getOpcode()); } 1442 bool isIncrementOp() const { 1443 return Opc == UO_PreInc || Opc == UO_PostInc; 1444 } 1445 bool isIncrementDecrementOp() const { 1446 return Opc <= UO_PreDec; 1447 } 1448 static bool isArithmeticOp(Opcode Op) { 1449 return Op >= UO_Plus && Op <= UO_LNot; 1450 } 1451 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1452 1453 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1454 /// corresponds to, e.g. "sizeof" or "[pre]++" 1455 static const char *getOpcodeStr(Opcode Op); 1456 1457 /// \brief Retrieve the unary opcode that corresponds to the given 1458 /// overloaded operator. 1459 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1460 1461 /// \brief Retrieve the overloaded operator kind that corresponds to 1462 /// the given unary opcode. 1463 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1464 1465 SourceRange getSourceRange() const { 1466 if (isPostfix()) 1467 return SourceRange(Val->getLocStart(), Loc); 1468 else 1469 return SourceRange(Loc, Val->getLocEnd()); 1470 } 1471 SourceLocation getExprLoc() const { return Loc; } 1472 1473 static bool classof(const Stmt *T) { 1474 return T->getStmtClass() == UnaryOperatorClass; 1475 } 1476 static bool classof(const UnaryOperator *) { return true; } 1477 1478 // Iterators 1479 child_range children() { return child_range(&Val, &Val+1); } 1480}; 1481 1482/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1483/// offsetof(record-type, member-designator). For example, given: 1484/// @code 1485/// struct S { 1486/// float f; 1487/// double d; 1488/// }; 1489/// struct T { 1490/// int i; 1491/// struct S s[10]; 1492/// }; 1493/// @endcode 1494/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1495 1496class OffsetOfExpr : public Expr { 1497public: 1498 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1499 class OffsetOfNode { 1500 public: 1501 /// \brief The kind of offsetof node we have. 1502 enum Kind { 1503 /// \brief An index into an array. 1504 Array = 0x00, 1505 /// \brief A field. 1506 Field = 0x01, 1507 /// \brief A field in a dependent type, known only by its name. 1508 Identifier = 0x02, 1509 /// \brief An implicit indirection through a C++ base class, when the 1510 /// field found is in a base class. 1511 Base = 0x03 1512 }; 1513 1514 private: 1515 enum { MaskBits = 2, Mask = 0x03 }; 1516 1517 /// \brief The source range that covers this part of the designator. 1518 SourceRange Range; 1519 1520 /// \brief The data describing the designator, which comes in three 1521 /// different forms, depending on the lower two bits. 1522 /// - An unsigned index into the array of Expr*'s stored after this node 1523 /// in memory, for [constant-expression] designators. 1524 /// - A FieldDecl*, for references to a known field. 1525 /// - An IdentifierInfo*, for references to a field with a given name 1526 /// when the class type is dependent. 1527 /// - A CXXBaseSpecifier*, for references that look at a field in a 1528 /// base class. 1529 uintptr_t Data; 1530 1531 public: 1532 /// \brief Create an offsetof node that refers to an array element. 1533 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1534 SourceLocation RBracketLoc) 1535 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1536 1537 /// \brief Create an offsetof node that refers to a field. 1538 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1539 SourceLocation NameLoc) 1540 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1541 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1542 1543 /// \brief Create an offsetof node that refers to an identifier. 1544 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1545 SourceLocation NameLoc) 1546 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1547 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1548 1549 /// \brief Create an offsetof node that refers into a C++ base class. 1550 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1551 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1552 1553 /// \brief Determine what kind of offsetof node this is. 1554 Kind getKind() const { 1555 return static_cast<Kind>(Data & Mask); 1556 } 1557 1558 /// \brief For an array element node, returns the index into the array 1559 /// of expressions. 1560 unsigned getArrayExprIndex() const { 1561 assert(getKind() == Array); 1562 return Data >> 2; 1563 } 1564 1565 /// \brief For a field offsetof node, returns the field. 1566 FieldDecl *getField() const { 1567 assert(getKind() == Field); 1568 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1569 } 1570 1571 /// \brief For a field or identifier offsetof node, returns the name of 1572 /// the field. 1573 IdentifierInfo *getFieldName() const; 1574 1575 /// \brief For a base class node, returns the base specifier. 1576 CXXBaseSpecifier *getBase() const { 1577 assert(getKind() == Base); 1578 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1579 } 1580 1581 /// \brief Retrieve the source range that covers this offsetof node. 1582 /// 1583 /// For an array element node, the source range contains the locations of 1584 /// the square brackets. For a field or identifier node, the source range 1585 /// contains the location of the period (if there is one) and the 1586 /// identifier. 1587 SourceRange getSourceRange() const { return Range; } 1588 }; 1589 1590private: 1591 1592 SourceLocation OperatorLoc, RParenLoc; 1593 // Base type; 1594 TypeSourceInfo *TSInfo; 1595 // Number of sub-components (i.e. instances of OffsetOfNode). 1596 unsigned NumComps; 1597 // Number of sub-expressions (i.e. array subscript expressions). 1598 unsigned NumExprs; 1599 1600 OffsetOfExpr(ASTContext &C, QualType type, 1601 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1602 OffsetOfNode* compsPtr, unsigned numComps, 1603 Expr** exprsPtr, unsigned numExprs, 1604 SourceLocation RParenLoc); 1605 1606 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1607 : Expr(OffsetOfExprClass, EmptyShell()), 1608 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1609 1610public: 1611 1612 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1613 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1614 OffsetOfNode* compsPtr, unsigned numComps, 1615 Expr** exprsPtr, unsigned numExprs, 1616 SourceLocation RParenLoc); 1617 1618 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1619 unsigned NumComps, unsigned NumExprs); 1620 1621 /// getOperatorLoc - Return the location of the operator. 1622 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1623 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1624 1625 /// \brief Return the location of the right parentheses. 1626 SourceLocation getRParenLoc() const { return RParenLoc; } 1627 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1628 1629 TypeSourceInfo *getTypeSourceInfo() const { 1630 return TSInfo; 1631 } 1632 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1633 TSInfo = tsi; 1634 } 1635 1636 const OffsetOfNode &getComponent(unsigned Idx) const { 1637 assert(Idx < NumComps && "Subscript out of range"); 1638 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1639 } 1640 1641 void setComponent(unsigned Idx, OffsetOfNode ON) { 1642 assert(Idx < NumComps && "Subscript out of range"); 1643 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1644 } 1645 1646 unsigned getNumComponents() const { 1647 return NumComps; 1648 } 1649 1650 Expr* getIndexExpr(unsigned Idx) { 1651 assert(Idx < NumExprs && "Subscript out of range"); 1652 return reinterpret_cast<Expr **>( 1653 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1654 } 1655 const Expr *getIndexExpr(unsigned Idx) const { 1656 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1657 } 1658 1659 void setIndexExpr(unsigned Idx, Expr* E) { 1660 assert(Idx < NumComps && "Subscript out of range"); 1661 reinterpret_cast<Expr **>( 1662 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1663 } 1664 1665 unsigned getNumExpressions() const { 1666 return NumExprs; 1667 } 1668 1669 SourceRange getSourceRange() const { 1670 return SourceRange(OperatorLoc, RParenLoc); 1671 } 1672 1673 static bool classof(const Stmt *T) { 1674 return T->getStmtClass() == OffsetOfExprClass; 1675 } 1676 1677 static bool classof(const OffsetOfExpr *) { return true; } 1678 1679 // Iterators 1680 child_range children() { 1681 Stmt **begin = 1682 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1683 + NumComps); 1684 return child_range(begin, begin + NumExprs); 1685 } 1686}; 1687 1688/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1689/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1690/// vec_step (OpenCL 1.1 6.11.12). 1691class UnaryExprOrTypeTraitExpr : public Expr { 1692 unsigned Kind : 2; 1693 bool isType : 1; // true if operand is a type, false if an expression 1694 union { 1695 TypeSourceInfo *Ty; 1696 Stmt *Ex; 1697 } Argument; 1698 SourceLocation OpLoc, RParenLoc; 1699 1700public: 1701 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1702 QualType resultType, SourceLocation op, 1703 SourceLocation rp) : 1704 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1705 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1706 // Value-dependent if the argument is type-dependent. 1707 TInfo->getType()->isDependentType(), 1708 TInfo->getType()->isInstantiationDependentType(), 1709 TInfo->getType()->containsUnexpandedParameterPack()), 1710 Kind(ExprKind), isType(true), OpLoc(op), RParenLoc(rp) { 1711 Argument.Ty = TInfo; 1712 } 1713 1714 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1715 QualType resultType, SourceLocation op, 1716 SourceLocation rp) : 1717 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1718 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1719 // Value-dependent if the argument is type-dependent. 1720 E->isTypeDependent(), 1721 E->isInstantiationDependent(), 1722 E->containsUnexpandedParameterPack()), 1723 Kind(ExprKind), isType(false), OpLoc(op), RParenLoc(rp) { 1724 Argument.Ex = E; 1725 } 1726 1727 /// \brief Construct an empty sizeof/alignof expression. 1728 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1729 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1730 1731 UnaryExprOrTypeTrait getKind() const { 1732 return static_cast<UnaryExprOrTypeTrait>(Kind); 1733 } 1734 void setKind(UnaryExprOrTypeTrait K) { Kind = K; } 1735 1736 bool isArgumentType() const { return isType; } 1737 QualType getArgumentType() const { 1738 return getArgumentTypeInfo()->getType(); 1739 } 1740 TypeSourceInfo *getArgumentTypeInfo() const { 1741 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1742 return Argument.Ty; 1743 } 1744 Expr *getArgumentExpr() { 1745 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1746 return static_cast<Expr*>(Argument.Ex); 1747 } 1748 const Expr *getArgumentExpr() const { 1749 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1750 } 1751 1752 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1753 void setArgument(TypeSourceInfo *TInfo) { 1754 Argument.Ty = TInfo; 1755 isType = true; 1756 } 1757 1758 /// Gets the argument type, or the type of the argument expression, whichever 1759 /// is appropriate. 1760 QualType getTypeOfArgument() const { 1761 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1762 } 1763 1764 SourceLocation getOperatorLoc() const { return OpLoc; } 1765 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1766 1767 SourceLocation getRParenLoc() const { return RParenLoc; } 1768 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1769 1770 SourceRange getSourceRange() const { 1771 return SourceRange(OpLoc, RParenLoc); 1772 } 1773 1774 static bool classof(const Stmt *T) { 1775 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1776 } 1777 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1778 1779 // Iterators 1780 child_range children(); 1781}; 1782 1783//===----------------------------------------------------------------------===// 1784// Postfix Operators. 1785//===----------------------------------------------------------------------===// 1786 1787/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1788class ArraySubscriptExpr : public Expr { 1789 enum { LHS, RHS, END_EXPR=2 }; 1790 Stmt* SubExprs[END_EXPR]; 1791 SourceLocation RBracketLoc; 1792public: 1793 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1794 ExprValueKind VK, ExprObjectKind OK, 1795 SourceLocation rbracketloc) 1796 : Expr(ArraySubscriptExprClass, t, VK, OK, 1797 lhs->isTypeDependent() || rhs->isTypeDependent(), 1798 lhs->isValueDependent() || rhs->isValueDependent(), 1799 (lhs->isInstantiationDependent() || 1800 rhs->isInstantiationDependent()), 1801 (lhs->containsUnexpandedParameterPack() || 1802 rhs->containsUnexpandedParameterPack())), 1803 RBracketLoc(rbracketloc) { 1804 SubExprs[LHS] = lhs; 1805 SubExprs[RHS] = rhs; 1806 } 1807 1808 /// \brief Create an empty array subscript expression. 1809 explicit ArraySubscriptExpr(EmptyShell Shell) 1810 : Expr(ArraySubscriptExprClass, Shell) { } 1811 1812 /// An array access can be written A[4] or 4[A] (both are equivalent). 1813 /// - getBase() and getIdx() always present the normalized view: A[4]. 1814 /// In this case getBase() returns "A" and getIdx() returns "4". 1815 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1816 /// 4[A] getLHS() returns "4". 1817 /// Note: Because vector element access is also written A[4] we must 1818 /// predicate the format conversion in getBase and getIdx only on the 1819 /// the type of the RHS, as it is possible for the LHS to be a vector of 1820 /// integer type 1821 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1822 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1823 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1824 1825 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1826 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1827 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1828 1829 Expr *getBase() { 1830 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1831 } 1832 1833 const Expr *getBase() const { 1834 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1835 } 1836 1837 Expr *getIdx() { 1838 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1839 } 1840 1841 const Expr *getIdx() const { 1842 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1843 } 1844 1845 SourceRange getSourceRange() const { 1846 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1847 } 1848 1849 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1850 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1851 1852 SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1853 1854 static bool classof(const Stmt *T) { 1855 return T->getStmtClass() == ArraySubscriptExprClass; 1856 } 1857 static bool classof(const ArraySubscriptExpr *) { return true; } 1858 1859 // Iterators 1860 child_range children() { 1861 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 1862 } 1863}; 1864 1865 1866/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1867/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1868/// while its subclasses may represent alternative syntax that (semantically) 1869/// results in a function call. For example, CXXOperatorCallExpr is 1870/// a subclass for overloaded operator calls that use operator syntax, e.g., 1871/// "str1 + str2" to resolve to a function call. 1872class CallExpr : public Expr { 1873 enum { FN=0, PREARGS_START=1 }; 1874 Stmt **SubExprs; 1875 unsigned NumArgs; 1876 SourceLocation RParenLoc; 1877 1878protected: 1879 // These versions of the constructor are for derived classes. 1880 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 1881 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 1882 SourceLocation rparenloc); 1883 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 1884 1885 Stmt *getPreArg(unsigned i) { 1886 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1887 return SubExprs[PREARGS_START+i]; 1888 } 1889 const Stmt *getPreArg(unsigned i) const { 1890 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1891 return SubExprs[PREARGS_START+i]; 1892 } 1893 void setPreArg(unsigned i, Stmt *PreArg) { 1894 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1895 SubExprs[PREARGS_START+i] = PreArg; 1896 } 1897 1898 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 1899 1900public: 1901 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1902 ExprValueKind VK, SourceLocation rparenloc); 1903 1904 /// \brief Build an empty call expression. 1905 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1906 1907 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1908 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1909 void setCallee(Expr *F) { SubExprs[FN] = F; } 1910 1911 Decl *getCalleeDecl(); 1912 const Decl *getCalleeDecl() const { 1913 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1914 } 1915 1916 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1917 FunctionDecl *getDirectCallee(); 1918 const FunctionDecl *getDirectCallee() const { 1919 return const_cast<CallExpr*>(this)->getDirectCallee(); 1920 } 1921 1922 /// getNumArgs - Return the number of actual arguments to this call. 1923 /// 1924 unsigned getNumArgs() const { return NumArgs; } 1925 1926 /// \brief Retrieve the call arguments. 1927 Expr **getArgs() { 1928 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 1929 } 1930 1931 /// getArg - Return the specified argument. 1932 Expr *getArg(unsigned Arg) { 1933 assert(Arg < NumArgs && "Arg access out of range!"); 1934 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1935 } 1936 const Expr *getArg(unsigned Arg) const { 1937 assert(Arg < NumArgs && "Arg access out of range!"); 1938 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1939 } 1940 1941 /// setArg - Set the specified argument. 1942 void setArg(unsigned Arg, Expr *ArgExpr) { 1943 assert(Arg < NumArgs && "Arg access out of range!"); 1944 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 1945 } 1946 1947 /// setNumArgs - This changes the number of arguments present in this call. 1948 /// Any orphaned expressions are deleted by this, and any new operands are set 1949 /// to null. 1950 void setNumArgs(ASTContext& C, unsigned NumArgs); 1951 1952 typedef ExprIterator arg_iterator; 1953 typedef ConstExprIterator const_arg_iterator; 1954 1955 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 1956 arg_iterator arg_end() { 1957 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1958 } 1959 const_arg_iterator arg_begin() const { 1960 return SubExprs+PREARGS_START+getNumPreArgs(); 1961 } 1962 const_arg_iterator arg_end() const { 1963 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1964 } 1965 1966 /// getNumCommas - Return the number of commas that must have been present in 1967 /// this function call. 1968 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1969 1970 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1971 /// not, return 0. 1972 unsigned isBuiltinCall(const ASTContext &Context) const; 1973 1974 /// getCallReturnType - Get the return type of the call expr. This is not 1975 /// always the type of the expr itself, if the return type is a reference 1976 /// type. 1977 QualType getCallReturnType() const; 1978 1979 SourceLocation getRParenLoc() const { return RParenLoc; } 1980 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1981 1982 SourceRange getSourceRange() const; 1983 1984 static bool classof(const Stmt *T) { 1985 return T->getStmtClass() >= firstCallExprConstant && 1986 T->getStmtClass() <= lastCallExprConstant; 1987 } 1988 static bool classof(const CallExpr *) { return true; } 1989 1990 // Iterators 1991 child_range children() { 1992 return child_range(&SubExprs[0], 1993 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 1994 } 1995}; 1996 1997/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1998/// 1999class MemberExpr : public Expr { 2000 /// Extra data stored in some member expressions. 2001 struct MemberNameQualifier { 2002 /// \brief The nested-name-specifier that qualifies the name, including 2003 /// source-location information. 2004 NestedNameSpecifierLoc QualifierLoc; 2005 2006 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2007 /// name qualifiers. 2008 DeclAccessPair FoundDecl; 2009 }; 2010 2011 /// Base - the expression for the base pointer or structure references. In 2012 /// X.F, this is "X". 2013 Stmt *Base; 2014 2015 /// MemberDecl - This is the decl being referenced by the field/member name. 2016 /// In X.F, this is the decl referenced by F. 2017 ValueDecl *MemberDecl; 2018 2019 /// MemberLoc - This is the location of the member name. 2020 SourceLocation MemberLoc; 2021 2022 /// MemberDNLoc - Provides source/type location info for the 2023 /// declaration name embedded in MemberDecl. 2024 DeclarationNameLoc MemberDNLoc; 2025 2026 /// IsArrow - True if this is "X->F", false if this is "X.F". 2027 bool IsArrow : 1; 2028 2029 /// \brief True if this member expression used a nested-name-specifier to 2030 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2031 /// declaration. When true, a MemberNameQualifier 2032 /// structure is allocated immediately after the MemberExpr. 2033 bool HasQualifierOrFoundDecl : 1; 2034 2035 /// \brief True if this member expression specified a template argument list 2036 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 2037 /// structure (and its TemplateArguments) are allocated immediately after 2038 /// the MemberExpr or, if the member expression also has a qualifier, after 2039 /// the MemberNameQualifier structure. 2040 bool HasExplicitTemplateArgumentList : 1; 2041 2042 /// \brief True if this member expression refers to a method that 2043 /// was resolved from an overloaded set having size greater than 1. 2044 bool HadMultipleCandidates : 1; 2045 2046 /// \brief Retrieve the qualifier that preceded the member name, if any. 2047 MemberNameQualifier *getMemberQualifier() { 2048 assert(HasQualifierOrFoundDecl); 2049 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2050 } 2051 2052 /// \brief Retrieve the qualifier that preceded the member name, if any. 2053 const MemberNameQualifier *getMemberQualifier() const { 2054 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2055 } 2056 2057public: 2058 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2059 const DeclarationNameInfo &NameInfo, QualType ty, 2060 ExprValueKind VK, ExprObjectKind OK) 2061 : Expr(MemberExprClass, ty, VK, OK, 2062 base->isTypeDependent(), 2063 base->isValueDependent(), 2064 base->isInstantiationDependent(), 2065 base->containsUnexpandedParameterPack()), 2066 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 2067 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 2068 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false), 2069 HadMultipleCandidates(false) { 2070 assert(memberdecl->getDeclName() == NameInfo.getName()); 2071 } 2072 2073 // NOTE: this constructor should be used only when it is known that 2074 // the member name can not provide additional syntactic info 2075 // (i.e., source locations for C++ operator names or type source info 2076 // for constructors, destructors and conversion oeprators). 2077 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2078 SourceLocation l, QualType ty, 2079 ExprValueKind VK, ExprObjectKind OK) 2080 : Expr(MemberExprClass, ty, VK, OK, 2081 base->isTypeDependent(), base->isValueDependent(), 2082 base->isInstantiationDependent(), 2083 base->containsUnexpandedParameterPack()), 2084 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 2085 IsArrow(isarrow), 2086 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false), 2087 HadMultipleCandidates(false) {} 2088 2089 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2090 NestedNameSpecifierLoc QualifierLoc, 2091 ValueDecl *memberdecl, DeclAccessPair founddecl, 2092 DeclarationNameInfo MemberNameInfo, 2093 const TemplateArgumentListInfo *targs, 2094 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2095 2096 void setBase(Expr *E) { Base = E; } 2097 Expr *getBase() const { return cast<Expr>(Base); } 2098 2099 /// \brief Retrieve the member declaration to which this expression refers. 2100 /// 2101 /// The returned declaration will either be a FieldDecl or (in C++) 2102 /// a CXXMethodDecl. 2103 ValueDecl *getMemberDecl() const { return MemberDecl; } 2104 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2105 2106 /// \brief Retrieves the declaration found by lookup. 2107 DeclAccessPair getFoundDecl() const { 2108 if (!HasQualifierOrFoundDecl) 2109 return DeclAccessPair::make(getMemberDecl(), 2110 getMemberDecl()->getAccess()); 2111 return getMemberQualifier()->FoundDecl; 2112 } 2113 2114 /// \brief Determines whether this member expression actually had 2115 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2116 /// x->Base::foo. 2117 bool hasQualifier() const { return getQualifier() != 0; } 2118 2119 /// \brief If the member name was qualified, retrieves the 2120 /// nested-name-specifier that precedes the member name. Otherwise, returns 2121 /// NULL. 2122 NestedNameSpecifier *getQualifier() const { 2123 if (!HasQualifierOrFoundDecl) 2124 return 0; 2125 2126 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2127 } 2128 2129 /// \brief If the member name was qualified, retrieves the 2130 /// nested-name-specifier that precedes the member name, with source-location 2131 /// information. 2132 NestedNameSpecifierLoc getQualifierLoc() const { 2133 if (!hasQualifier()) 2134 return NestedNameSpecifierLoc(); 2135 2136 return getMemberQualifier()->QualifierLoc; 2137 } 2138 2139 /// \brief Determines whether this member expression actually had a C++ 2140 /// template argument list explicitly specified, e.g., x.f<int>. 2141 bool hasExplicitTemplateArgs() const { 2142 return HasExplicitTemplateArgumentList; 2143 } 2144 2145 /// \brief Copies the template arguments (if present) into the given 2146 /// structure. 2147 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2148 if (hasExplicitTemplateArgs()) 2149 getExplicitTemplateArgs().copyInto(List); 2150 } 2151 2152 /// \brief Retrieve the explicit template argument list that 2153 /// follow the member template name. This must only be called on an 2154 /// expression with explicit template arguments. 2155 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2156 assert(HasExplicitTemplateArgumentList); 2157 if (!HasQualifierOrFoundDecl) 2158 return *reinterpret_cast<ASTTemplateArgumentListInfo *>(this + 1); 2159 2160 return *reinterpret_cast<ASTTemplateArgumentListInfo *>( 2161 getMemberQualifier() + 1); 2162 } 2163 2164 /// \brief Retrieve the explicit template argument list that 2165 /// followed the member template name. This must only be called on 2166 /// an expression with explicit template arguments. 2167 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2168 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2169 } 2170 2171 /// \brief Retrieves the optional explicit template arguments. 2172 /// This points to the same data as getExplicitTemplateArgs(), but 2173 /// returns null if there are no explicit template arguments. 2174 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2175 if (!hasExplicitTemplateArgs()) return 0; 2176 return &getExplicitTemplateArgs(); 2177 } 2178 2179 /// \brief Retrieve the location of the left angle bracket following the 2180 /// member name ('<'), if any. 2181 SourceLocation getLAngleLoc() const { 2182 if (!HasExplicitTemplateArgumentList) 2183 return SourceLocation(); 2184 2185 return getExplicitTemplateArgs().LAngleLoc; 2186 } 2187 2188 /// \brief Retrieve the template arguments provided as part of this 2189 /// template-id. 2190 const TemplateArgumentLoc *getTemplateArgs() const { 2191 if (!HasExplicitTemplateArgumentList) 2192 return 0; 2193 2194 return getExplicitTemplateArgs().getTemplateArgs(); 2195 } 2196 2197 /// \brief Retrieve the number of template arguments provided as part of this 2198 /// template-id. 2199 unsigned getNumTemplateArgs() const { 2200 if (!HasExplicitTemplateArgumentList) 2201 return 0; 2202 2203 return getExplicitTemplateArgs().NumTemplateArgs; 2204 } 2205 2206 /// \brief Retrieve the location of the right angle bracket following the 2207 /// template arguments ('>'). 2208 SourceLocation getRAngleLoc() const { 2209 if (!HasExplicitTemplateArgumentList) 2210 return SourceLocation(); 2211 2212 return getExplicitTemplateArgs().RAngleLoc; 2213 } 2214 2215 /// \brief Retrieve the member declaration name info. 2216 DeclarationNameInfo getMemberNameInfo() const { 2217 return DeclarationNameInfo(MemberDecl->getDeclName(), 2218 MemberLoc, MemberDNLoc); 2219 } 2220 2221 bool isArrow() const { return IsArrow; } 2222 void setArrow(bool A) { IsArrow = A; } 2223 2224 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2225 /// location of 'F'. 2226 SourceLocation getMemberLoc() const { return MemberLoc; } 2227 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2228 2229 SourceRange getSourceRange() const; 2230 2231 SourceLocation getExprLoc() const { return MemberLoc; } 2232 2233 /// \brief Determine whether the base of this explicit is implicit. 2234 bool isImplicitAccess() const { 2235 return getBase() && getBase()->isImplicitCXXThis(); 2236 } 2237 2238 /// \brief Returns true if this member expression refers to a method that 2239 /// was resolved from an overloaded set having size greater than 1. 2240 bool hadMultipleCandidates() const { 2241 return HadMultipleCandidates; 2242 } 2243 /// \brief Sets the flag telling whether this expression refers to 2244 /// a method that was resolved from an overloaded set having size 2245 /// greater than 1. 2246 void setHadMultipleCandidates(bool V = true) { 2247 HadMultipleCandidates = V; 2248 } 2249 2250 static bool classof(const Stmt *T) { 2251 return T->getStmtClass() == MemberExprClass; 2252 } 2253 static bool classof(const MemberExpr *) { return true; } 2254 2255 // Iterators 2256 child_range children() { return child_range(&Base, &Base+1); } 2257 2258 friend class ASTReader; 2259 friend class ASTStmtWriter; 2260}; 2261 2262/// CompoundLiteralExpr - [C99 6.5.2.5] 2263/// 2264class CompoundLiteralExpr : public Expr { 2265 /// LParenLoc - If non-null, this is the location of the left paren in a 2266 /// compound literal like "(int){4}". This can be null if this is a 2267 /// synthesized compound expression. 2268 SourceLocation LParenLoc; 2269 2270 /// The type as written. This can be an incomplete array type, in 2271 /// which case the actual expression type will be different. 2272 TypeSourceInfo *TInfo; 2273 Stmt *Init; 2274 bool FileScope; 2275public: 2276 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2277 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2278 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2279 tinfo->getType()->isDependentType(), 2280 init->isValueDependent(), 2281 (init->isInstantiationDependent() || 2282 tinfo->getType()->isInstantiationDependentType()), 2283 init->containsUnexpandedParameterPack()), 2284 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2285 2286 /// \brief Construct an empty compound literal. 2287 explicit CompoundLiteralExpr(EmptyShell Empty) 2288 : Expr(CompoundLiteralExprClass, Empty) { } 2289 2290 const Expr *getInitializer() const { return cast<Expr>(Init); } 2291 Expr *getInitializer() { return cast<Expr>(Init); } 2292 void setInitializer(Expr *E) { Init = E; } 2293 2294 bool isFileScope() const { return FileScope; } 2295 void setFileScope(bool FS) { FileScope = FS; } 2296 2297 SourceLocation getLParenLoc() const { return LParenLoc; } 2298 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2299 2300 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2301 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2302 2303 SourceRange getSourceRange() const { 2304 // FIXME: Init should never be null. 2305 if (!Init) 2306 return SourceRange(); 2307 if (LParenLoc.isInvalid()) 2308 return Init->getSourceRange(); 2309 return SourceRange(LParenLoc, Init->getLocEnd()); 2310 } 2311 2312 static bool classof(const Stmt *T) { 2313 return T->getStmtClass() == CompoundLiteralExprClass; 2314 } 2315 static bool classof(const CompoundLiteralExpr *) { return true; } 2316 2317 // Iterators 2318 child_range children() { return child_range(&Init, &Init+1); } 2319}; 2320 2321/// CastExpr - Base class for type casts, including both implicit 2322/// casts (ImplicitCastExpr) and explicit casts that have some 2323/// representation in the source code (ExplicitCastExpr's derived 2324/// classes). 2325class CastExpr : public Expr { 2326public: 2327 typedef clang::CastKind CastKind; 2328 2329private: 2330 Stmt *Op; 2331 2332 void CheckCastConsistency() const; 2333 2334 const CXXBaseSpecifier * const *path_buffer() const { 2335 return const_cast<CastExpr*>(this)->path_buffer(); 2336 } 2337 CXXBaseSpecifier **path_buffer(); 2338 2339 void setBasePathSize(unsigned basePathSize) { 2340 CastExprBits.BasePathSize = basePathSize; 2341 assert(CastExprBits.BasePathSize == basePathSize && 2342 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2343 } 2344 2345protected: 2346 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2347 const CastKind kind, Expr *op, unsigned BasePathSize) : 2348 Expr(SC, ty, VK, OK_Ordinary, 2349 // Cast expressions are type-dependent if the type is 2350 // dependent (C++ [temp.dep.expr]p3). 2351 ty->isDependentType(), 2352 // Cast expressions are value-dependent if the type is 2353 // dependent or if the subexpression is value-dependent. 2354 ty->isDependentType() || (op && op->isValueDependent()), 2355 (ty->isInstantiationDependentType() || 2356 (op && op->isInstantiationDependent())), 2357 (ty->containsUnexpandedParameterPack() || 2358 op->containsUnexpandedParameterPack())), 2359 Op(op) { 2360 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2361 CastExprBits.Kind = kind; 2362 setBasePathSize(BasePathSize); 2363#ifndef NDEBUG 2364 CheckCastConsistency(); 2365#endif 2366 } 2367 2368 /// \brief Construct an empty cast. 2369 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2370 : Expr(SC, Empty) { 2371 setBasePathSize(BasePathSize); 2372 } 2373 2374public: 2375 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2376 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2377 const char *getCastKindName() const; 2378 2379 Expr *getSubExpr() { return cast<Expr>(Op); } 2380 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2381 void setSubExpr(Expr *E) { Op = E; } 2382 2383 /// \brief Retrieve the cast subexpression as it was written in the source 2384 /// code, looking through any implicit casts or other intermediate nodes 2385 /// introduced by semantic analysis. 2386 Expr *getSubExprAsWritten(); 2387 const Expr *getSubExprAsWritten() const { 2388 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2389 } 2390 2391 typedef CXXBaseSpecifier **path_iterator; 2392 typedef const CXXBaseSpecifier * const *path_const_iterator; 2393 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2394 unsigned path_size() const { return CastExprBits.BasePathSize; } 2395 path_iterator path_begin() { return path_buffer(); } 2396 path_iterator path_end() { return path_buffer() + path_size(); } 2397 path_const_iterator path_begin() const { return path_buffer(); } 2398 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2399 2400 void setCastPath(const CXXCastPath &Path); 2401 2402 static bool classof(const Stmt *T) { 2403 return T->getStmtClass() >= firstCastExprConstant && 2404 T->getStmtClass() <= lastCastExprConstant; 2405 } 2406 static bool classof(const CastExpr *) { return true; } 2407 2408 // Iterators 2409 child_range children() { return child_range(&Op, &Op+1); } 2410}; 2411 2412/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2413/// conversions, which have no direct representation in the original 2414/// source code. For example: converting T[]->T*, void f()->void 2415/// (*f)(), float->double, short->int, etc. 2416/// 2417/// In C, implicit casts always produce rvalues. However, in C++, an 2418/// implicit cast whose result is being bound to a reference will be 2419/// an lvalue or xvalue. For example: 2420/// 2421/// @code 2422/// class Base { }; 2423/// class Derived : public Base { }; 2424/// Derived &&ref(); 2425/// void f(Derived d) { 2426/// Base& b = d; // initializer is an ImplicitCastExpr 2427/// // to an lvalue of type Base 2428/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2429/// // to an xvalue of type Base 2430/// } 2431/// @endcode 2432class ImplicitCastExpr : public CastExpr { 2433private: 2434 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2435 unsigned BasePathLength, ExprValueKind VK) 2436 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2437 } 2438 2439 /// \brief Construct an empty implicit cast. 2440 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2441 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2442 2443public: 2444 enum OnStack_t { OnStack }; 2445 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2446 ExprValueKind VK) 2447 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2448 } 2449 2450 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2451 CastKind Kind, Expr *Operand, 2452 const CXXCastPath *BasePath, 2453 ExprValueKind Cat); 2454 2455 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2456 2457 SourceRange getSourceRange() const { 2458 return getSubExpr()->getSourceRange(); 2459 } 2460 2461 static bool classof(const Stmt *T) { 2462 return T->getStmtClass() == ImplicitCastExprClass; 2463 } 2464 static bool classof(const ImplicitCastExpr *) { return true; } 2465}; 2466 2467inline Expr *Expr::IgnoreImpCasts() { 2468 Expr *e = this; 2469 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2470 e = ice->getSubExpr(); 2471 return e; 2472} 2473 2474/// ExplicitCastExpr - An explicit cast written in the source 2475/// code. 2476/// 2477/// This class is effectively an abstract class, because it provides 2478/// the basic representation of an explicitly-written cast without 2479/// specifying which kind of cast (C cast, functional cast, static 2480/// cast, etc.) was written; specific derived classes represent the 2481/// particular style of cast and its location information. 2482/// 2483/// Unlike implicit casts, explicit cast nodes have two different 2484/// types: the type that was written into the source code, and the 2485/// actual type of the expression as determined by semantic 2486/// analysis. These types may differ slightly. For example, in C++ one 2487/// can cast to a reference type, which indicates that the resulting 2488/// expression will be an lvalue or xvalue. The reference type, however, 2489/// will not be used as the type of the expression. 2490class ExplicitCastExpr : public CastExpr { 2491 /// TInfo - Source type info for the (written) type 2492 /// this expression is casting to. 2493 TypeSourceInfo *TInfo; 2494 2495protected: 2496 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2497 CastKind kind, Expr *op, unsigned PathSize, 2498 TypeSourceInfo *writtenTy) 2499 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2500 2501 /// \brief Construct an empty explicit cast. 2502 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2503 : CastExpr(SC, Shell, PathSize) { } 2504 2505public: 2506 /// getTypeInfoAsWritten - Returns the type source info for the type 2507 /// that this expression is casting to. 2508 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2509 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2510 2511 /// getTypeAsWritten - Returns the type that this expression is 2512 /// casting to, as written in the source code. 2513 QualType getTypeAsWritten() const { return TInfo->getType(); } 2514 2515 static bool classof(const Stmt *T) { 2516 return T->getStmtClass() >= firstExplicitCastExprConstant && 2517 T->getStmtClass() <= lastExplicitCastExprConstant; 2518 } 2519 static bool classof(const ExplicitCastExpr *) { return true; } 2520}; 2521 2522/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2523/// cast in C++ (C++ [expr.cast]), which uses the syntax 2524/// (Type)expr. For example: @c (int)f. 2525class CStyleCastExpr : public ExplicitCastExpr { 2526 SourceLocation LPLoc; // the location of the left paren 2527 SourceLocation RPLoc; // the location of the right paren 2528 2529 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2530 unsigned PathSize, TypeSourceInfo *writtenTy, 2531 SourceLocation l, SourceLocation r) 2532 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2533 writtenTy), LPLoc(l), RPLoc(r) {} 2534 2535 /// \brief Construct an empty C-style explicit cast. 2536 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2537 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2538 2539public: 2540 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2541 ExprValueKind VK, CastKind K, 2542 Expr *Op, const CXXCastPath *BasePath, 2543 TypeSourceInfo *WrittenTy, SourceLocation L, 2544 SourceLocation R); 2545 2546 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2547 2548 SourceLocation getLParenLoc() const { return LPLoc; } 2549 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2550 2551 SourceLocation getRParenLoc() const { return RPLoc; } 2552 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2553 2554 SourceRange getSourceRange() const { 2555 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2556 } 2557 static bool classof(const Stmt *T) { 2558 return T->getStmtClass() == CStyleCastExprClass; 2559 } 2560 static bool classof(const CStyleCastExpr *) { return true; } 2561}; 2562 2563/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2564/// 2565/// This expression node kind describes a builtin binary operation, 2566/// such as "x + y" for integer values "x" and "y". The operands will 2567/// already have been converted to appropriate types (e.g., by 2568/// performing promotions or conversions). 2569/// 2570/// In C++, where operators may be overloaded, a different kind of 2571/// expression node (CXXOperatorCallExpr) is used to express the 2572/// invocation of an overloaded operator with operator syntax. Within 2573/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2574/// used to store an expression "x + y" depends on the subexpressions 2575/// for x and y. If neither x or y is type-dependent, and the "+" 2576/// operator resolves to a built-in operation, BinaryOperator will be 2577/// used to express the computation (x and y may still be 2578/// value-dependent). If either x or y is type-dependent, or if the 2579/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2580/// be used to express the computation. 2581class BinaryOperator : public Expr { 2582public: 2583 typedef BinaryOperatorKind Opcode; 2584 2585private: 2586 unsigned Opc : 6; 2587 SourceLocation OpLoc; 2588 2589 enum { LHS, RHS, END_EXPR }; 2590 Stmt* SubExprs[END_EXPR]; 2591public: 2592 2593 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2594 ExprValueKind VK, ExprObjectKind OK, 2595 SourceLocation opLoc) 2596 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2597 lhs->isTypeDependent() || rhs->isTypeDependent(), 2598 lhs->isValueDependent() || rhs->isValueDependent(), 2599 (lhs->isInstantiationDependent() || 2600 rhs->isInstantiationDependent()), 2601 (lhs->containsUnexpandedParameterPack() || 2602 rhs->containsUnexpandedParameterPack())), 2603 Opc(opc), OpLoc(opLoc) { 2604 SubExprs[LHS] = lhs; 2605 SubExprs[RHS] = rhs; 2606 assert(!isCompoundAssignmentOp() && 2607 "Use ArithAssignBinaryOperator for compound assignments"); 2608 } 2609 2610 /// \brief Construct an empty binary operator. 2611 explicit BinaryOperator(EmptyShell Empty) 2612 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2613 2614 SourceLocation getOperatorLoc() const { return OpLoc; } 2615 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2616 2617 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2618 void setOpcode(Opcode O) { Opc = O; } 2619 2620 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2621 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2622 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2623 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2624 2625 SourceRange getSourceRange() const { 2626 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2627 } 2628 2629 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2630 /// corresponds to, e.g. "<<=". 2631 static const char *getOpcodeStr(Opcode Op); 2632 2633 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2634 2635 /// \brief Retrieve the binary opcode that corresponds to the given 2636 /// overloaded operator. 2637 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2638 2639 /// \brief Retrieve the overloaded operator kind that corresponds to 2640 /// the given binary opcode. 2641 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2642 2643 /// predicates to categorize the respective opcodes. 2644 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2645 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2646 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2647 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2648 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2649 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2650 2651 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2652 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2653 2654 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2655 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2656 2657 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2658 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2659 2660 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2661 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2662 2663 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2664 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2665 2666 static bool isAssignmentOp(Opcode Opc) { 2667 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2668 } 2669 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2670 2671 static bool isCompoundAssignmentOp(Opcode Opc) { 2672 return Opc > BO_Assign && Opc <= BO_OrAssign; 2673 } 2674 bool isCompoundAssignmentOp() const { 2675 return isCompoundAssignmentOp(getOpcode()); 2676 } 2677 2678 static bool isShiftAssignOp(Opcode Opc) { 2679 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2680 } 2681 bool isShiftAssignOp() const { 2682 return isShiftAssignOp(getOpcode()); 2683 } 2684 2685 static bool classof(const Stmt *S) { 2686 return S->getStmtClass() >= firstBinaryOperatorConstant && 2687 S->getStmtClass() <= lastBinaryOperatorConstant; 2688 } 2689 static bool classof(const BinaryOperator *) { return true; } 2690 2691 // Iterators 2692 child_range children() { 2693 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2694 } 2695 2696protected: 2697 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2698 ExprValueKind VK, ExprObjectKind OK, 2699 SourceLocation opLoc, bool dead) 2700 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2701 lhs->isTypeDependent() || rhs->isTypeDependent(), 2702 lhs->isValueDependent() || rhs->isValueDependent(), 2703 (lhs->isInstantiationDependent() || 2704 rhs->isInstantiationDependent()), 2705 (lhs->containsUnexpandedParameterPack() || 2706 rhs->containsUnexpandedParameterPack())), 2707 Opc(opc), OpLoc(opLoc) { 2708 SubExprs[LHS] = lhs; 2709 SubExprs[RHS] = rhs; 2710 } 2711 2712 BinaryOperator(StmtClass SC, EmptyShell Empty) 2713 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2714}; 2715 2716/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2717/// track of the type the operation is performed in. Due to the semantics of 2718/// these operators, the operands are promoted, the arithmetic performed, an 2719/// implicit conversion back to the result type done, then the assignment takes 2720/// place. This captures the intermediate type which the computation is done 2721/// in. 2722class CompoundAssignOperator : public BinaryOperator { 2723 QualType ComputationLHSType; 2724 QualType ComputationResultType; 2725public: 2726 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2727 ExprValueKind VK, ExprObjectKind OK, 2728 QualType CompLHSType, QualType CompResultType, 2729 SourceLocation OpLoc) 2730 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2731 ComputationLHSType(CompLHSType), 2732 ComputationResultType(CompResultType) { 2733 assert(isCompoundAssignmentOp() && 2734 "Only should be used for compound assignments"); 2735 } 2736 2737 /// \brief Build an empty compound assignment operator expression. 2738 explicit CompoundAssignOperator(EmptyShell Empty) 2739 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2740 2741 // The two computation types are the type the LHS is converted 2742 // to for the computation and the type of the result; the two are 2743 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2744 QualType getComputationLHSType() const { return ComputationLHSType; } 2745 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2746 2747 QualType getComputationResultType() const { return ComputationResultType; } 2748 void setComputationResultType(QualType T) { ComputationResultType = T; } 2749 2750 static bool classof(const CompoundAssignOperator *) { return true; } 2751 static bool classof(const Stmt *S) { 2752 return S->getStmtClass() == CompoundAssignOperatorClass; 2753 } 2754}; 2755 2756/// AbstractConditionalOperator - An abstract base class for 2757/// ConditionalOperator and BinaryConditionalOperator. 2758class AbstractConditionalOperator : public Expr { 2759 SourceLocation QuestionLoc, ColonLoc; 2760 friend class ASTStmtReader; 2761 2762protected: 2763 AbstractConditionalOperator(StmtClass SC, QualType T, 2764 ExprValueKind VK, ExprObjectKind OK, 2765 bool TD, bool VD, bool ID, 2766 bool ContainsUnexpandedParameterPack, 2767 SourceLocation qloc, 2768 SourceLocation cloc) 2769 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 2770 QuestionLoc(qloc), ColonLoc(cloc) {} 2771 2772 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2773 : Expr(SC, Empty) { } 2774 2775public: 2776 // getCond - Return the expression representing the condition for 2777 // the ?: operator. 2778 Expr *getCond() const; 2779 2780 // getTrueExpr - Return the subexpression representing the value of 2781 // the expression if the condition evaluates to true. 2782 Expr *getTrueExpr() const; 2783 2784 // getFalseExpr - Return the subexpression representing the value of 2785 // the expression if the condition evaluates to false. This is 2786 // the same as getRHS. 2787 Expr *getFalseExpr() const; 2788 2789 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2790 SourceLocation getColonLoc() const { return ColonLoc; } 2791 2792 static bool classof(const Stmt *T) { 2793 return T->getStmtClass() == ConditionalOperatorClass || 2794 T->getStmtClass() == BinaryConditionalOperatorClass; 2795 } 2796 static bool classof(const AbstractConditionalOperator *) { return true; } 2797}; 2798 2799/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2800/// middle" extension is a BinaryConditionalOperator. 2801class ConditionalOperator : public AbstractConditionalOperator { 2802 enum { COND, LHS, RHS, END_EXPR }; 2803 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2804 2805 friend class ASTStmtReader; 2806public: 2807 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2808 SourceLocation CLoc, Expr *rhs, 2809 QualType t, ExprValueKind VK, ExprObjectKind OK) 2810 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 2811 // FIXME: the type of the conditional operator doesn't 2812 // depend on the type of the conditional, but the standard 2813 // seems to imply that it could. File a bug! 2814 (lhs->isTypeDependent() || rhs->isTypeDependent()), 2815 (cond->isValueDependent() || lhs->isValueDependent() || 2816 rhs->isValueDependent()), 2817 (cond->isInstantiationDependent() || 2818 lhs->isInstantiationDependent() || 2819 rhs->isInstantiationDependent()), 2820 (cond->containsUnexpandedParameterPack() || 2821 lhs->containsUnexpandedParameterPack() || 2822 rhs->containsUnexpandedParameterPack()), 2823 QLoc, CLoc) { 2824 SubExprs[COND] = cond; 2825 SubExprs[LHS] = lhs; 2826 SubExprs[RHS] = rhs; 2827 } 2828 2829 /// \brief Build an empty conditional operator. 2830 explicit ConditionalOperator(EmptyShell Empty) 2831 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 2832 2833 // getCond - Return the expression representing the condition for 2834 // the ?: operator. 2835 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2836 2837 // getTrueExpr - Return the subexpression representing the value of 2838 // the expression if the condition evaluates to true. 2839 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 2840 2841 // getFalseExpr - Return the subexpression representing the value of 2842 // the expression if the condition evaluates to false. This is 2843 // the same as getRHS. 2844 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2845 2846 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2847 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2848 2849 SourceRange getSourceRange() const { 2850 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2851 } 2852 static bool classof(const Stmt *T) { 2853 return T->getStmtClass() == ConditionalOperatorClass; 2854 } 2855 static bool classof(const ConditionalOperator *) { return true; } 2856 2857 // Iterators 2858 child_range children() { 2859 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2860 } 2861}; 2862 2863/// BinaryConditionalOperator - The GNU extension to the conditional 2864/// operator which allows the middle operand to be omitted. 2865/// 2866/// This is a different expression kind on the assumption that almost 2867/// every client ends up needing to know that these are different. 2868class BinaryConditionalOperator : public AbstractConditionalOperator { 2869 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 2870 2871 /// - the common condition/left-hand-side expression, which will be 2872 /// evaluated as the opaque value 2873 /// - the condition, expressed in terms of the opaque value 2874 /// - the left-hand-side, expressed in terms of the opaque value 2875 /// - the right-hand-side 2876 Stmt *SubExprs[NUM_SUBEXPRS]; 2877 OpaqueValueExpr *OpaqueValue; 2878 2879 friend class ASTStmtReader; 2880public: 2881 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 2882 Expr *cond, Expr *lhs, Expr *rhs, 2883 SourceLocation qloc, SourceLocation cloc, 2884 QualType t, ExprValueKind VK, ExprObjectKind OK) 2885 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 2886 (common->isTypeDependent() || rhs->isTypeDependent()), 2887 (common->isValueDependent() || rhs->isValueDependent()), 2888 (common->isInstantiationDependent() || 2889 rhs->isInstantiationDependent()), 2890 (common->containsUnexpandedParameterPack() || 2891 rhs->containsUnexpandedParameterPack()), 2892 qloc, cloc), 2893 OpaqueValue(opaqueValue) { 2894 SubExprs[COMMON] = common; 2895 SubExprs[COND] = cond; 2896 SubExprs[LHS] = lhs; 2897 SubExprs[RHS] = rhs; 2898 2899 OpaqueValue->setSourceExpr(common); 2900 } 2901 2902 /// \brief Build an empty conditional operator. 2903 explicit BinaryConditionalOperator(EmptyShell Empty) 2904 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 2905 2906 /// \brief getCommon - Return the common expression, written to the 2907 /// left of the condition. The opaque value will be bound to the 2908 /// result of this expression. 2909 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 2910 2911 /// \brief getOpaqueValue - Return the opaque value placeholder. 2912 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 2913 2914 /// \brief getCond - Return the condition expression; this is defined 2915 /// in terms of the opaque value. 2916 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2917 2918 /// \brief getTrueExpr - Return the subexpression which will be 2919 /// evaluated if the condition evaluates to true; this is defined 2920 /// in terms of the opaque value. 2921 Expr *getTrueExpr() const { 2922 return cast<Expr>(SubExprs[LHS]); 2923 } 2924 2925 /// \brief getFalseExpr - Return the subexpression which will be 2926 /// evaluated if the condnition evaluates to false; this is 2927 /// defined in terms of the opaque value. 2928 Expr *getFalseExpr() const { 2929 return cast<Expr>(SubExprs[RHS]); 2930 } 2931 2932 SourceRange getSourceRange() const { 2933 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 2934 } 2935 static bool classof(const Stmt *T) { 2936 return T->getStmtClass() == BinaryConditionalOperatorClass; 2937 } 2938 static bool classof(const BinaryConditionalOperator *) { return true; } 2939 2940 // Iterators 2941 child_range children() { 2942 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 2943 } 2944}; 2945 2946inline Expr *AbstractConditionalOperator::getCond() const { 2947 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2948 return co->getCond(); 2949 return cast<BinaryConditionalOperator>(this)->getCond(); 2950} 2951 2952inline Expr *AbstractConditionalOperator::getTrueExpr() const { 2953 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2954 return co->getTrueExpr(); 2955 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 2956} 2957 2958inline Expr *AbstractConditionalOperator::getFalseExpr() const { 2959 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2960 return co->getFalseExpr(); 2961 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 2962} 2963 2964/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2965class AddrLabelExpr : public Expr { 2966 SourceLocation AmpAmpLoc, LabelLoc; 2967 LabelDecl *Label; 2968public: 2969 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 2970 QualType t) 2971 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 2972 false), 2973 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2974 2975 /// \brief Build an empty address of a label expression. 2976 explicit AddrLabelExpr(EmptyShell Empty) 2977 : Expr(AddrLabelExprClass, Empty) { } 2978 2979 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2980 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2981 SourceLocation getLabelLoc() const { return LabelLoc; } 2982 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2983 2984 SourceRange getSourceRange() const { 2985 return SourceRange(AmpAmpLoc, LabelLoc); 2986 } 2987 2988 LabelDecl *getLabel() const { return Label; } 2989 void setLabel(LabelDecl *L) { Label = L; } 2990 2991 static bool classof(const Stmt *T) { 2992 return T->getStmtClass() == AddrLabelExprClass; 2993 } 2994 static bool classof(const AddrLabelExpr *) { return true; } 2995 2996 // Iterators 2997 child_range children() { return child_range(); } 2998}; 2999 3000/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3001/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3002/// takes the value of the last subexpression. 3003/// 3004/// A StmtExpr is always an r-value; values "returned" out of a 3005/// StmtExpr will be copied. 3006class StmtExpr : public Expr { 3007 Stmt *SubStmt; 3008 SourceLocation LParenLoc, RParenLoc; 3009public: 3010 // FIXME: Does type-dependence need to be computed differently? 3011 // FIXME: Do we need to compute instantiation instantiation-dependence for 3012 // statements? (ugh!) 3013 StmtExpr(CompoundStmt *substmt, QualType T, 3014 SourceLocation lp, SourceLocation rp) : 3015 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3016 T->isDependentType(), false, false, false), 3017 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3018 3019 /// \brief Build an empty statement expression. 3020 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3021 3022 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3023 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3024 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3025 3026 SourceRange getSourceRange() const { 3027 return SourceRange(LParenLoc, RParenLoc); 3028 } 3029 3030 SourceLocation getLParenLoc() const { return LParenLoc; } 3031 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3032 SourceLocation getRParenLoc() const { return RParenLoc; } 3033 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3034 3035 static bool classof(const Stmt *T) { 3036 return T->getStmtClass() == StmtExprClass; 3037 } 3038 static bool classof(const StmtExpr *) { return true; } 3039 3040 // Iterators 3041 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3042}; 3043 3044 3045/// ShuffleVectorExpr - clang-specific builtin-in function 3046/// __builtin_shufflevector. 3047/// This AST node represents a operator that does a constant 3048/// shuffle, similar to LLVM's shufflevector instruction. It takes 3049/// two vectors and a variable number of constant indices, 3050/// and returns the appropriately shuffled vector. 3051class ShuffleVectorExpr : public Expr { 3052 SourceLocation BuiltinLoc, RParenLoc; 3053 3054 // SubExprs - the list of values passed to the __builtin_shufflevector 3055 // function. The first two are vectors, and the rest are constant 3056 // indices. The number of values in this list is always 3057 // 2+the number of indices in the vector type. 3058 Stmt **SubExprs; 3059 unsigned NumExprs; 3060 3061public: 3062 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3063 QualType Type, SourceLocation BLoc, 3064 SourceLocation RP); 3065 3066 /// \brief Build an empty vector-shuffle expression. 3067 explicit ShuffleVectorExpr(EmptyShell Empty) 3068 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3069 3070 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3071 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3072 3073 SourceLocation getRParenLoc() const { return RParenLoc; } 3074 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3075 3076 SourceRange getSourceRange() const { 3077 return SourceRange(BuiltinLoc, RParenLoc); 3078 } 3079 static bool classof(const Stmt *T) { 3080 return T->getStmtClass() == ShuffleVectorExprClass; 3081 } 3082 static bool classof(const ShuffleVectorExpr *) { return true; } 3083 3084 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3085 /// constant expression, the actual arguments passed in, and the function 3086 /// pointers. 3087 unsigned getNumSubExprs() const { return NumExprs; } 3088 3089 /// \brief Retrieve the array of expressions. 3090 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3091 3092 /// getExpr - Return the Expr at the specified index. 3093 Expr *getExpr(unsigned Index) { 3094 assert((Index < NumExprs) && "Arg access out of range!"); 3095 return cast<Expr>(SubExprs[Index]); 3096 } 3097 const Expr *getExpr(unsigned Index) const { 3098 assert((Index < NumExprs) && "Arg access out of range!"); 3099 return cast<Expr>(SubExprs[Index]); 3100 } 3101 3102 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3103 3104 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3105 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3106 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3107 } 3108 3109 // Iterators 3110 child_range children() { 3111 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3112 } 3113}; 3114 3115/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3116/// This AST node is similar to the conditional operator (?:) in C, with 3117/// the following exceptions: 3118/// - the test expression must be a integer constant expression. 3119/// - the expression returned acts like the chosen subexpression in every 3120/// visible way: the type is the same as that of the chosen subexpression, 3121/// and all predicates (whether it's an l-value, whether it's an integer 3122/// constant expression, etc.) return the same result as for the chosen 3123/// sub-expression. 3124class ChooseExpr : public Expr { 3125 enum { COND, LHS, RHS, END_EXPR }; 3126 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3127 SourceLocation BuiltinLoc, RParenLoc; 3128public: 3129 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3130 QualType t, ExprValueKind VK, ExprObjectKind OK, 3131 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3132 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3133 (cond->isInstantiationDependent() || 3134 lhs->isInstantiationDependent() || 3135 rhs->isInstantiationDependent()), 3136 (cond->containsUnexpandedParameterPack() || 3137 lhs->containsUnexpandedParameterPack() || 3138 rhs->containsUnexpandedParameterPack())), 3139 BuiltinLoc(BLoc), RParenLoc(RP) { 3140 SubExprs[COND] = cond; 3141 SubExprs[LHS] = lhs; 3142 SubExprs[RHS] = rhs; 3143 } 3144 3145 /// \brief Build an empty __builtin_choose_expr. 3146 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3147 3148 /// isConditionTrue - Return whether the condition is true (i.e. not 3149 /// equal to zero). 3150 bool isConditionTrue(const ASTContext &C) const; 3151 3152 /// getChosenSubExpr - Return the subexpression chosen according to the 3153 /// condition. 3154 Expr *getChosenSubExpr(const ASTContext &C) const { 3155 return isConditionTrue(C) ? getLHS() : getRHS(); 3156 } 3157 3158 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3159 void setCond(Expr *E) { SubExprs[COND] = E; } 3160 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3161 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3162 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3163 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3164 3165 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3166 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3167 3168 SourceLocation getRParenLoc() const { return RParenLoc; } 3169 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3170 3171 SourceRange getSourceRange() const { 3172 return SourceRange(BuiltinLoc, RParenLoc); 3173 } 3174 static bool classof(const Stmt *T) { 3175 return T->getStmtClass() == ChooseExprClass; 3176 } 3177 static bool classof(const ChooseExpr *) { return true; } 3178 3179 // Iterators 3180 child_range children() { 3181 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3182 } 3183}; 3184 3185/// GNUNullExpr - Implements the GNU __null extension, which is a name 3186/// for a null pointer constant that has integral type (e.g., int or 3187/// long) and is the same size and alignment as a pointer. The __null 3188/// extension is typically only used by system headers, which define 3189/// NULL as __null in C++ rather than using 0 (which is an integer 3190/// that may not match the size of a pointer). 3191class GNUNullExpr : public Expr { 3192 /// TokenLoc - The location of the __null keyword. 3193 SourceLocation TokenLoc; 3194 3195public: 3196 GNUNullExpr(QualType Ty, SourceLocation Loc) 3197 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3198 false), 3199 TokenLoc(Loc) { } 3200 3201 /// \brief Build an empty GNU __null expression. 3202 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3203 3204 /// getTokenLocation - The location of the __null token. 3205 SourceLocation getTokenLocation() const { return TokenLoc; } 3206 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3207 3208 SourceRange getSourceRange() const { 3209 return SourceRange(TokenLoc); 3210 } 3211 static bool classof(const Stmt *T) { 3212 return T->getStmtClass() == GNUNullExprClass; 3213 } 3214 static bool classof(const GNUNullExpr *) { return true; } 3215 3216 // Iterators 3217 child_range children() { return child_range(); } 3218}; 3219 3220/// VAArgExpr, used for the builtin function __builtin_va_arg. 3221class VAArgExpr : public Expr { 3222 Stmt *Val; 3223 TypeSourceInfo *TInfo; 3224 SourceLocation BuiltinLoc, RParenLoc; 3225public: 3226 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3227 SourceLocation RPLoc, QualType t) 3228 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3229 t->isDependentType(), false, 3230 (TInfo->getType()->isInstantiationDependentType() || 3231 e->isInstantiationDependent()), 3232 (TInfo->getType()->containsUnexpandedParameterPack() || 3233 e->containsUnexpandedParameterPack())), 3234 Val(e), TInfo(TInfo), 3235 BuiltinLoc(BLoc), 3236 RParenLoc(RPLoc) { } 3237 3238 /// \brief Create an empty __builtin_va_arg expression. 3239 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3240 3241 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3242 Expr *getSubExpr() { return cast<Expr>(Val); } 3243 void setSubExpr(Expr *E) { Val = E; } 3244 3245 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3246 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3247 3248 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3249 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3250 3251 SourceLocation getRParenLoc() const { return RParenLoc; } 3252 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3253 3254 SourceRange getSourceRange() const { 3255 return SourceRange(BuiltinLoc, RParenLoc); 3256 } 3257 static bool classof(const Stmt *T) { 3258 return T->getStmtClass() == VAArgExprClass; 3259 } 3260 static bool classof(const VAArgExpr *) { return true; } 3261 3262 // Iterators 3263 child_range children() { return child_range(&Val, &Val+1); } 3264}; 3265 3266/// @brief Describes an C or C++ initializer list. 3267/// 3268/// InitListExpr describes an initializer list, which can be used to 3269/// initialize objects of different types, including 3270/// struct/class/union types, arrays, and vectors. For example: 3271/// 3272/// @code 3273/// struct foo x = { 1, { 2, 3 } }; 3274/// @endcode 3275/// 3276/// Prior to semantic analysis, an initializer list will represent the 3277/// initializer list as written by the user, but will have the 3278/// placeholder type "void". This initializer list is called the 3279/// syntactic form of the initializer, and may contain C99 designated 3280/// initializers (represented as DesignatedInitExprs), initializations 3281/// of subobject members without explicit braces, and so on. Clients 3282/// interested in the original syntax of the initializer list should 3283/// use the syntactic form of the initializer list. 3284/// 3285/// After semantic analysis, the initializer list will represent the 3286/// semantic form of the initializer, where the initializations of all 3287/// subobjects are made explicit with nested InitListExpr nodes and 3288/// C99 designators have been eliminated by placing the designated 3289/// initializations into the subobject they initialize. Additionally, 3290/// any "holes" in the initialization, where no initializer has been 3291/// specified for a particular subobject, will be replaced with 3292/// implicitly-generated ImplicitValueInitExpr expressions that 3293/// value-initialize the subobjects. Note, however, that the 3294/// initializer lists may still have fewer initializers than there are 3295/// elements to initialize within the object. 3296/// 3297/// Given the semantic form of the initializer list, one can retrieve 3298/// the original syntactic form of that initializer list (if it 3299/// exists) using getSyntacticForm(). Since many initializer lists 3300/// have the same syntactic and semantic forms, getSyntacticForm() may 3301/// return NULL, indicating that the current initializer list also 3302/// serves as its syntactic form. 3303class InitListExpr : public Expr { 3304 // FIXME: Eliminate this vector in favor of ASTContext allocation 3305 typedef ASTVector<Stmt *> InitExprsTy; 3306 InitExprsTy InitExprs; 3307 SourceLocation LBraceLoc, RBraceLoc; 3308 3309 /// Contains the initializer list that describes the syntactic form 3310 /// written in the source code. 3311 InitListExpr *SyntacticForm; 3312 3313 /// \brief Either: 3314 /// If this initializer list initializes an array with more elements than 3315 /// there are initializers in the list, specifies an expression to be used 3316 /// for value initialization of the rest of the elements. 3317 /// Or 3318 /// If this initializer list initializes a union, specifies which 3319 /// field within the union will be initialized. 3320 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3321 3322 /// Whether this initializer list originally had a GNU array-range 3323 /// designator in it. This is a temporary marker used by CodeGen. 3324 bool HadArrayRangeDesignator; 3325 3326public: 3327 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3328 Expr **initexprs, unsigned numinits, 3329 SourceLocation rbraceloc); 3330 3331 /// \brief Build an empty initializer list. 3332 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3333 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3334 3335 unsigned getNumInits() const { return InitExprs.size(); } 3336 3337 /// \brief Retrieve the set of initializers. 3338 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3339 3340 const Expr *getInit(unsigned Init) const { 3341 assert(Init < getNumInits() && "Initializer access out of range!"); 3342 return cast_or_null<Expr>(InitExprs[Init]); 3343 } 3344 3345 Expr *getInit(unsigned Init) { 3346 assert(Init < getNumInits() && "Initializer access out of range!"); 3347 return cast_or_null<Expr>(InitExprs[Init]); 3348 } 3349 3350 void setInit(unsigned Init, Expr *expr) { 3351 assert(Init < getNumInits() && "Initializer access out of range!"); 3352 InitExprs[Init] = expr; 3353 } 3354 3355 /// \brief Reserve space for some number of initializers. 3356 void reserveInits(ASTContext &C, unsigned NumInits); 3357 3358 /// @brief Specify the number of initializers 3359 /// 3360 /// If there are more than @p NumInits initializers, the remaining 3361 /// initializers will be destroyed. If there are fewer than @p 3362 /// NumInits initializers, NULL expressions will be added for the 3363 /// unknown initializers. 3364 void resizeInits(ASTContext &Context, unsigned NumInits); 3365 3366 /// @brief Updates the initializer at index @p Init with the new 3367 /// expression @p expr, and returns the old expression at that 3368 /// location. 3369 /// 3370 /// When @p Init is out of range for this initializer list, the 3371 /// initializer list will be extended with NULL expressions to 3372 /// accommodate the new entry. 3373 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3374 3375 /// \brief If this initializer list initializes an array with more elements 3376 /// than there are initializers in the list, specifies an expression to be 3377 /// used for value initialization of the rest of the elements. 3378 Expr *getArrayFiller() { 3379 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3380 } 3381 const Expr *getArrayFiller() const { 3382 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3383 } 3384 void setArrayFiller(Expr *filler); 3385 3386 /// \brief If this initializes a union, specifies which field in the 3387 /// union to initialize. 3388 /// 3389 /// Typically, this field is the first named field within the 3390 /// union. However, a designated initializer can specify the 3391 /// initialization of a different field within the union. 3392 FieldDecl *getInitializedFieldInUnion() { 3393 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3394 } 3395 const FieldDecl *getInitializedFieldInUnion() const { 3396 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3397 } 3398 void setInitializedFieldInUnion(FieldDecl *FD) { 3399 ArrayFillerOrUnionFieldInit = FD; 3400 } 3401 3402 // Explicit InitListExpr's originate from source code (and have valid source 3403 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3404 bool isExplicit() { 3405 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3406 } 3407 3408 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3409 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3410 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3411 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3412 3413 /// @brief Retrieve the initializer list that describes the 3414 /// syntactic form of the initializer. 3415 /// 3416 /// 3417 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3418 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3419 3420 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3421 void sawArrayRangeDesignator(bool ARD = true) { 3422 HadArrayRangeDesignator = ARD; 3423 } 3424 3425 SourceRange getSourceRange() const; 3426 3427 static bool classof(const Stmt *T) { 3428 return T->getStmtClass() == InitListExprClass; 3429 } 3430 static bool classof(const InitListExpr *) { return true; } 3431 3432 // Iterators 3433 child_range children() { 3434 if (InitExprs.empty()) return child_range(); 3435 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3436 } 3437 3438 typedef InitExprsTy::iterator iterator; 3439 typedef InitExprsTy::const_iterator const_iterator; 3440 typedef InitExprsTy::reverse_iterator reverse_iterator; 3441 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3442 3443 iterator begin() { return InitExprs.begin(); } 3444 const_iterator begin() const { return InitExprs.begin(); } 3445 iterator end() { return InitExprs.end(); } 3446 const_iterator end() const { return InitExprs.end(); } 3447 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3448 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3449 reverse_iterator rend() { return InitExprs.rend(); } 3450 const_reverse_iterator rend() const { return InitExprs.rend(); } 3451 3452 friend class ASTStmtReader; 3453 friend class ASTStmtWriter; 3454}; 3455 3456/// @brief Represents a C99 designated initializer expression. 3457/// 3458/// A designated initializer expression (C99 6.7.8) contains one or 3459/// more designators (which can be field designators, array 3460/// designators, or GNU array-range designators) followed by an 3461/// expression that initializes the field or element(s) that the 3462/// designators refer to. For example, given: 3463/// 3464/// @code 3465/// struct point { 3466/// double x; 3467/// double y; 3468/// }; 3469/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3470/// @endcode 3471/// 3472/// The InitListExpr contains three DesignatedInitExprs, the first of 3473/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3474/// designators, one array designator for @c [2] followed by one field 3475/// designator for @c .y. The initalization expression will be 1.0. 3476class DesignatedInitExpr : public Expr { 3477public: 3478 /// \brief Forward declaration of the Designator class. 3479 class Designator; 3480 3481private: 3482 /// The location of the '=' or ':' prior to the actual initializer 3483 /// expression. 3484 SourceLocation EqualOrColonLoc; 3485 3486 /// Whether this designated initializer used the GNU deprecated 3487 /// syntax rather than the C99 '=' syntax. 3488 bool GNUSyntax : 1; 3489 3490 /// The number of designators in this initializer expression. 3491 unsigned NumDesignators : 15; 3492 3493 /// \brief The designators in this designated initialization 3494 /// expression. 3495 Designator *Designators; 3496 3497 /// The number of subexpressions of this initializer expression, 3498 /// which contains both the initializer and any additional 3499 /// expressions used by array and array-range designators. 3500 unsigned NumSubExprs : 16; 3501 3502 3503 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3504 const Designator *Designators, 3505 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3506 Expr **IndexExprs, unsigned NumIndexExprs, 3507 Expr *Init); 3508 3509 explicit DesignatedInitExpr(unsigned NumSubExprs) 3510 : Expr(DesignatedInitExprClass, EmptyShell()), 3511 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3512 3513public: 3514 /// A field designator, e.g., ".x". 3515 struct FieldDesignator { 3516 /// Refers to the field that is being initialized. The low bit 3517 /// of this field determines whether this is actually a pointer 3518 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3519 /// initially constructed, a field designator will store an 3520 /// IdentifierInfo*. After semantic analysis has resolved that 3521 /// name, the field designator will instead store a FieldDecl*. 3522 uintptr_t NameOrField; 3523 3524 /// The location of the '.' in the designated initializer. 3525 unsigned DotLoc; 3526 3527 /// The location of the field name in the designated initializer. 3528 unsigned FieldLoc; 3529 }; 3530 3531 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3532 struct ArrayOrRangeDesignator { 3533 /// Location of the first index expression within the designated 3534 /// initializer expression's list of subexpressions. 3535 unsigned Index; 3536 /// The location of the '[' starting the array range designator. 3537 unsigned LBracketLoc; 3538 /// The location of the ellipsis separating the start and end 3539 /// indices. Only valid for GNU array-range designators. 3540 unsigned EllipsisLoc; 3541 /// The location of the ']' terminating the array range designator. 3542 unsigned RBracketLoc; 3543 }; 3544 3545 /// @brief Represents a single C99 designator. 3546 /// 3547 /// @todo This class is infuriatingly similar to clang::Designator, 3548 /// but minor differences (storing indices vs. storing pointers) 3549 /// keep us from reusing it. Try harder, later, to rectify these 3550 /// differences. 3551 class Designator { 3552 /// @brief The kind of designator this describes. 3553 enum { 3554 FieldDesignator, 3555 ArrayDesignator, 3556 ArrayRangeDesignator 3557 } Kind; 3558 3559 union { 3560 /// A field designator, e.g., ".x". 3561 struct FieldDesignator Field; 3562 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3563 struct ArrayOrRangeDesignator ArrayOrRange; 3564 }; 3565 friend class DesignatedInitExpr; 3566 3567 public: 3568 Designator() {} 3569 3570 /// @brief Initializes a field designator. 3571 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3572 SourceLocation FieldLoc) 3573 : Kind(FieldDesignator) { 3574 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3575 Field.DotLoc = DotLoc.getRawEncoding(); 3576 Field.FieldLoc = FieldLoc.getRawEncoding(); 3577 } 3578 3579 /// @brief Initializes an array designator. 3580 Designator(unsigned Index, SourceLocation LBracketLoc, 3581 SourceLocation RBracketLoc) 3582 : Kind(ArrayDesignator) { 3583 ArrayOrRange.Index = Index; 3584 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3585 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3586 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3587 } 3588 3589 /// @brief Initializes a GNU array-range designator. 3590 Designator(unsigned Index, SourceLocation LBracketLoc, 3591 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3592 : Kind(ArrayRangeDesignator) { 3593 ArrayOrRange.Index = Index; 3594 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3595 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3596 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3597 } 3598 3599 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3600 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3601 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3602 3603 IdentifierInfo *getFieldName() const; 3604 3605 FieldDecl *getField() const { 3606 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3607 if (Field.NameOrField & 0x01) 3608 return 0; 3609 else 3610 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3611 } 3612 3613 void setField(FieldDecl *FD) { 3614 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3615 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3616 } 3617 3618 SourceLocation getDotLoc() const { 3619 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3620 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3621 } 3622 3623 SourceLocation getFieldLoc() const { 3624 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3625 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3626 } 3627 3628 SourceLocation getLBracketLoc() const { 3629 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3630 "Only valid on an array or array-range designator"); 3631 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3632 } 3633 3634 SourceLocation getRBracketLoc() const { 3635 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3636 "Only valid on an array or array-range designator"); 3637 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3638 } 3639 3640 SourceLocation getEllipsisLoc() const { 3641 assert(Kind == ArrayRangeDesignator && 3642 "Only valid on an array-range designator"); 3643 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3644 } 3645 3646 unsigned getFirstExprIndex() const { 3647 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3648 "Only valid on an array or array-range designator"); 3649 return ArrayOrRange.Index; 3650 } 3651 3652 SourceLocation getStartLocation() const { 3653 if (Kind == FieldDesignator) 3654 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3655 else 3656 return getLBracketLoc(); 3657 } 3658 SourceLocation getEndLocation() const { 3659 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3660 } 3661 SourceRange getSourceRange() const { 3662 return SourceRange(getStartLocation(), getEndLocation()); 3663 } 3664 }; 3665 3666 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3667 unsigned NumDesignators, 3668 Expr **IndexExprs, unsigned NumIndexExprs, 3669 SourceLocation EqualOrColonLoc, 3670 bool GNUSyntax, Expr *Init); 3671 3672 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3673 3674 /// @brief Returns the number of designators in this initializer. 3675 unsigned size() const { return NumDesignators; } 3676 3677 // Iterator access to the designators. 3678 typedef Designator *designators_iterator; 3679 designators_iterator designators_begin() { return Designators; } 3680 designators_iterator designators_end() { 3681 return Designators + NumDesignators; 3682 } 3683 3684 typedef const Designator *const_designators_iterator; 3685 const_designators_iterator designators_begin() const { return Designators; } 3686 const_designators_iterator designators_end() const { 3687 return Designators + NumDesignators; 3688 } 3689 3690 typedef std::reverse_iterator<designators_iterator> 3691 reverse_designators_iterator; 3692 reverse_designators_iterator designators_rbegin() { 3693 return reverse_designators_iterator(designators_end()); 3694 } 3695 reverse_designators_iterator designators_rend() { 3696 return reverse_designators_iterator(designators_begin()); 3697 } 3698 3699 typedef std::reverse_iterator<const_designators_iterator> 3700 const_reverse_designators_iterator; 3701 const_reverse_designators_iterator designators_rbegin() const { 3702 return const_reverse_designators_iterator(designators_end()); 3703 } 3704 const_reverse_designators_iterator designators_rend() const { 3705 return const_reverse_designators_iterator(designators_begin()); 3706 } 3707 3708 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3709 3710 void setDesignators(ASTContext &C, const Designator *Desigs, 3711 unsigned NumDesigs); 3712 3713 Expr *getArrayIndex(const Designator& D); 3714 Expr *getArrayRangeStart(const Designator& D); 3715 Expr *getArrayRangeEnd(const Designator& D); 3716 3717 /// @brief Retrieve the location of the '=' that precedes the 3718 /// initializer value itself, if present. 3719 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3720 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3721 3722 /// @brief Determines whether this designated initializer used the 3723 /// deprecated GNU syntax for designated initializers. 3724 bool usesGNUSyntax() const { return GNUSyntax; } 3725 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3726 3727 /// @brief Retrieve the initializer value. 3728 Expr *getInit() const { 3729 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3730 } 3731 3732 void setInit(Expr *init) { 3733 *child_begin() = init; 3734 } 3735 3736 /// \brief Retrieve the total number of subexpressions in this 3737 /// designated initializer expression, including the actual 3738 /// initialized value and any expressions that occur within array 3739 /// and array-range designators. 3740 unsigned getNumSubExprs() const { return NumSubExprs; } 3741 3742 Expr *getSubExpr(unsigned Idx) { 3743 assert(Idx < NumSubExprs && "Subscript out of range"); 3744 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3745 Ptr += sizeof(DesignatedInitExpr); 3746 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3747 } 3748 3749 void setSubExpr(unsigned Idx, Expr *E) { 3750 assert(Idx < NumSubExprs && "Subscript out of range"); 3751 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3752 Ptr += sizeof(DesignatedInitExpr); 3753 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3754 } 3755 3756 /// \brief Replaces the designator at index @p Idx with the series 3757 /// of designators in [First, Last). 3758 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3759 const Designator *Last); 3760 3761 SourceRange getDesignatorsSourceRange() const; 3762 3763 SourceRange getSourceRange() const; 3764 3765 static bool classof(const Stmt *T) { 3766 return T->getStmtClass() == DesignatedInitExprClass; 3767 } 3768 static bool classof(const DesignatedInitExpr *) { return true; } 3769 3770 // Iterators 3771 child_range children() { 3772 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3773 return child_range(begin, begin + NumSubExprs); 3774 } 3775}; 3776 3777/// \brief Represents an implicitly-generated value initialization of 3778/// an object of a given type. 3779/// 3780/// Implicit value initializations occur within semantic initializer 3781/// list expressions (InitListExpr) as placeholders for subobject 3782/// initializations not explicitly specified by the user. 3783/// 3784/// \see InitListExpr 3785class ImplicitValueInitExpr : public Expr { 3786public: 3787 explicit ImplicitValueInitExpr(QualType ty) 3788 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3789 false, false, ty->isInstantiationDependentType(), false) { } 3790 3791 /// \brief Construct an empty implicit value initialization. 3792 explicit ImplicitValueInitExpr(EmptyShell Empty) 3793 : Expr(ImplicitValueInitExprClass, Empty) { } 3794 3795 static bool classof(const Stmt *T) { 3796 return T->getStmtClass() == ImplicitValueInitExprClass; 3797 } 3798 static bool classof(const ImplicitValueInitExpr *) { return true; } 3799 3800 SourceRange getSourceRange() const { 3801 return SourceRange(); 3802 } 3803 3804 // Iterators 3805 child_range children() { return child_range(); } 3806}; 3807 3808 3809class ParenListExpr : public Expr { 3810 Stmt **Exprs; 3811 unsigned NumExprs; 3812 SourceLocation LParenLoc, RParenLoc; 3813 3814public: 3815 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3816 unsigned numexprs, SourceLocation rparenloc, QualType T); 3817 3818 /// \brief Build an empty paren list. 3819 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3820 3821 unsigned getNumExprs() const { return NumExprs; } 3822 3823 const Expr* getExpr(unsigned Init) const { 3824 assert(Init < getNumExprs() && "Initializer access out of range!"); 3825 return cast_or_null<Expr>(Exprs[Init]); 3826 } 3827 3828 Expr* getExpr(unsigned Init) { 3829 assert(Init < getNumExprs() && "Initializer access out of range!"); 3830 return cast_or_null<Expr>(Exprs[Init]); 3831 } 3832 3833 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3834 3835 SourceLocation getLParenLoc() const { return LParenLoc; } 3836 SourceLocation getRParenLoc() const { return RParenLoc; } 3837 3838 SourceRange getSourceRange() const { 3839 return SourceRange(LParenLoc, RParenLoc); 3840 } 3841 static bool classof(const Stmt *T) { 3842 return T->getStmtClass() == ParenListExprClass; 3843 } 3844 static bool classof(const ParenListExpr *) { return true; } 3845 3846 // Iterators 3847 child_range children() { 3848 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 3849 } 3850 3851 friend class ASTStmtReader; 3852 friend class ASTStmtWriter; 3853}; 3854 3855 3856/// \brief Represents a C1X generic selection. 3857/// 3858/// A generic selection (C1X 6.5.1.1) contains an unevaluated controlling 3859/// expression, followed by one or more generic associations. Each generic 3860/// association specifies a type name and an expression, or "default" and an 3861/// expression (in which case it is known as a default generic association). 3862/// The type and value of the generic selection are identical to those of its 3863/// result expression, which is defined as the expression in the generic 3864/// association with a type name that is compatible with the type of the 3865/// controlling expression, or the expression in the default generic association 3866/// if no types are compatible. For example: 3867/// 3868/// @code 3869/// _Generic(X, double: 1, float: 2, default: 3) 3870/// @endcode 3871/// 3872/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 3873/// or 3 if "hello". 3874/// 3875/// As an extension, generic selections are allowed in C++, where the following 3876/// additional semantics apply: 3877/// 3878/// Any generic selection whose controlling expression is type-dependent or 3879/// which names a dependent type in its association list is result-dependent, 3880/// which means that the choice of result expression is dependent. 3881/// Result-dependent generic associations are both type- and value-dependent. 3882class GenericSelectionExpr : public Expr { 3883 enum { CONTROLLING, END_EXPR }; 3884 TypeSourceInfo **AssocTypes; 3885 Stmt **SubExprs; 3886 unsigned NumAssocs, ResultIndex; 3887 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 3888 3889public: 3890 GenericSelectionExpr(ASTContext &Context, 3891 SourceLocation GenericLoc, Expr *ControllingExpr, 3892 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3893 unsigned NumAssocs, SourceLocation DefaultLoc, 3894 SourceLocation RParenLoc, 3895 bool ContainsUnexpandedParameterPack, 3896 unsigned ResultIndex); 3897 3898 /// This constructor is used in the result-dependent case. 3899 GenericSelectionExpr(ASTContext &Context, 3900 SourceLocation GenericLoc, Expr *ControllingExpr, 3901 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3902 unsigned NumAssocs, SourceLocation DefaultLoc, 3903 SourceLocation RParenLoc, 3904 bool ContainsUnexpandedParameterPack); 3905 3906 explicit GenericSelectionExpr(EmptyShell Empty) 3907 : Expr(GenericSelectionExprClass, Empty) { } 3908 3909 unsigned getNumAssocs() const { return NumAssocs; } 3910 3911 SourceLocation getGenericLoc() const { return GenericLoc; } 3912 SourceLocation getDefaultLoc() const { return DefaultLoc; } 3913 SourceLocation getRParenLoc() const { return RParenLoc; } 3914 3915 const Expr *getAssocExpr(unsigned i) const { 3916 return cast<Expr>(SubExprs[END_EXPR+i]); 3917 } 3918 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 3919 3920 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 3921 return AssocTypes[i]; 3922 } 3923 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 3924 3925 QualType getAssocType(unsigned i) const { 3926 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 3927 return TS->getType(); 3928 else 3929 return QualType(); 3930 } 3931 3932 const Expr *getControllingExpr() const { 3933 return cast<Expr>(SubExprs[CONTROLLING]); 3934 } 3935 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 3936 3937 /// Whether this generic selection is result-dependent. 3938 bool isResultDependent() const { return ResultIndex == -1U; } 3939 3940 /// The zero-based index of the result expression's generic association in 3941 /// the generic selection's association list. Defined only if the 3942 /// generic selection is not result-dependent. 3943 unsigned getResultIndex() const { 3944 assert(!isResultDependent() && "Generic selection is result-dependent"); 3945 return ResultIndex; 3946 } 3947 3948 /// The generic selection's result expression. Defined only if the 3949 /// generic selection is not result-dependent. 3950 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 3951 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 3952 3953 SourceRange getSourceRange() const { 3954 return SourceRange(GenericLoc, RParenLoc); 3955 } 3956 static bool classof(const Stmt *T) { 3957 return T->getStmtClass() == GenericSelectionExprClass; 3958 } 3959 static bool classof(const GenericSelectionExpr *) { return true; } 3960 3961 child_range children() { 3962 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 3963 } 3964 3965 friend class ASTStmtReader; 3966}; 3967 3968//===----------------------------------------------------------------------===// 3969// Clang Extensions 3970//===----------------------------------------------------------------------===// 3971 3972 3973/// ExtVectorElementExpr - This represents access to specific elements of a 3974/// vector, and may occur on the left hand side or right hand side. For example 3975/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3976/// 3977/// Note that the base may have either vector or pointer to vector type, just 3978/// like a struct field reference. 3979/// 3980class ExtVectorElementExpr : public Expr { 3981 Stmt *Base; 3982 IdentifierInfo *Accessor; 3983 SourceLocation AccessorLoc; 3984public: 3985 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 3986 IdentifierInfo &accessor, SourceLocation loc) 3987 : Expr(ExtVectorElementExprClass, ty, VK, 3988 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 3989 base->isTypeDependent(), base->isValueDependent(), 3990 base->isInstantiationDependent(), 3991 base->containsUnexpandedParameterPack()), 3992 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3993 3994 /// \brief Build an empty vector element expression. 3995 explicit ExtVectorElementExpr(EmptyShell Empty) 3996 : Expr(ExtVectorElementExprClass, Empty) { } 3997 3998 const Expr *getBase() const { return cast<Expr>(Base); } 3999 Expr *getBase() { return cast<Expr>(Base); } 4000 void setBase(Expr *E) { Base = E; } 4001 4002 IdentifierInfo &getAccessor() const { return *Accessor; } 4003 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4004 4005 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4006 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4007 4008 /// getNumElements - Get the number of components being selected. 4009 unsigned getNumElements() const; 4010 4011 /// containsDuplicateElements - Return true if any element access is 4012 /// repeated. 4013 bool containsDuplicateElements() const; 4014 4015 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4016 /// aggregate Constant of ConstantInt(s). 4017 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4018 4019 SourceRange getSourceRange() const { 4020 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4021 } 4022 4023 /// isArrow - Return true if the base expression is a pointer to vector, 4024 /// return false if the base expression is a vector. 4025 bool isArrow() const; 4026 4027 static bool classof(const Stmt *T) { 4028 return T->getStmtClass() == ExtVectorElementExprClass; 4029 } 4030 static bool classof(const ExtVectorElementExpr *) { return true; } 4031 4032 // Iterators 4033 child_range children() { return child_range(&Base, &Base+1); } 4034}; 4035 4036 4037/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4038/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4039class BlockExpr : public Expr { 4040protected: 4041 BlockDecl *TheBlock; 4042public: 4043 BlockExpr(BlockDecl *BD, QualType ty) 4044 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4045 ty->isDependentType(), false, 4046 // FIXME: Check for instantiate-dependence in the statement? 4047 ty->isInstantiationDependentType(), 4048 false), 4049 TheBlock(BD) {} 4050 4051 /// \brief Build an empty block expression. 4052 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4053 4054 const BlockDecl *getBlockDecl() const { return TheBlock; } 4055 BlockDecl *getBlockDecl() { return TheBlock; } 4056 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4057 4058 // Convenience functions for probing the underlying BlockDecl. 4059 SourceLocation getCaretLocation() const; 4060 const Stmt *getBody() const; 4061 Stmt *getBody(); 4062 4063 SourceRange getSourceRange() const { 4064 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4065 } 4066 4067 /// getFunctionType - Return the underlying function type for this block. 4068 const FunctionType *getFunctionType() const; 4069 4070 static bool classof(const Stmt *T) { 4071 return T->getStmtClass() == BlockExprClass; 4072 } 4073 static bool classof(const BlockExpr *) { return true; } 4074 4075 // Iterators 4076 child_range children() { return child_range(); } 4077}; 4078 4079/// BlockDeclRefExpr - A reference to a local variable declared in an 4080/// enclosing scope. 4081class BlockDeclRefExpr : public Expr { 4082 VarDecl *D; 4083 SourceLocation Loc; 4084 bool IsByRef : 1; 4085 bool ConstQualAdded : 1; 4086public: 4087 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 4088 SourceLocation l, bool ByRef, bool constAdded = false); 4089 4090 // \brief Build an empty reference to a declared variable in a 4091 // block. 4092 explicit BlockDeclRefExpr(EmptyShell Empty) 4093 : Expr(BlockDeclRefExprClass, Empty) { } 4094 4095 VarDecl *getDecl() { return D; } 4096 const VarDecl *getDecl() const { return D; } 4097 void setDecl(VarDecl *VD) { D = VD; } 4098 4099 SourceLocation getLocation() const { return Loc; } 4100 void setLocation(SourceLocation L) { Loc = L; } 4101 4102 SourceRange getSourceRange() const { return SourceRange(Loc); } 4103 4104 bool isByRef() const { return IsByRef; } 4105 void setByRef(bool BR) { IsByRef = BR; } 4106 4107 bool isConstQualAdded() const { return ConstQualAdded; } 4108 void setConstQualAdded(bool C) { ConstQualAdded = C; } 4109 4110 static bool classof(const Stmt *T) { 4111 return T->getStmtClass() == BlockDeclRefExprClass; 4112 } 4113 static bool classof(const BlockDeclRefExpr *) { return true; } 4114 4115 // Iterators 4116 child_range children() { return child_range(); } 4117}; 4118 4119/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4120/// This AST node provides support for reinterpreting a type to another 4121/// type of the same size. 4122class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4123private: 4124 Stmt *SrcExpr; 4125 SourceLocation BuiltinLoc, RParenLoc; 4126 4127 friend class ASTReader; 4128 friend class ASTStmtReader; 4129 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4130 4131public: 4132 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4133 ExprValueKind VK, ExprObjectKind OK, 4134 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4135 : Expr(AsTypeExprClass, DstType, VK, OK, 4136 DstType->isDependentType(), 4137 DstType->isDependentType() || SrcExpr->isValueDependent(), 4138 (DstType->isInstantiationDependentType() || 4139 SrcExpr->isInstantiationDependent()), 4140 (DstType->containsUnexpandedParameterPack() || 4141 SrcExpr->containsUnexpandedParameterPack())), 4142 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4143 4144 /// getSrcExpr - Return the Expr to be converted. 4145 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4146 4147 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4148 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4149 4150 /// getRParenLoc - Return the location of final right parenthesis. 4151 SourceLocation getRParenLoc() const { return RParenLoc; } 4152 4153 SourceRange getSourceRange() const { 4154 return SourceRange(BuiltinLoc, RParenLoc); 4155 } 4156 4157 static bool classof(const Stmt *T) { 4158 return T->getStmtClass() == AsTypeExprClass; 4159 } 4160 static bool classof(const AsTypeExpr *) { return true; } 4161 4162 // Iterators 4163 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4164}; 4165 4166/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4167/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4168/// similarly-named C++0x instructions. All of these instructions take one 4169/// primary pointer and at least one memory order. 4170class AtomicExpr : public Expr { 4171public: 4172 enum AtomicOp { Load, Store, CmpXchgStrong, CmpXchgWeak, Xchg, 4173 Add, Sub, And, Or, Xor }; 4174private: 4175 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, END_EXPR }; 4176 Stmt* SubExprs[END_EXPR]; 4177 unsigned NumSubExprs; 4178 SourceLocation BuiltinLoc, RParenLoc; 4179 AtomicOp Op; 4180 4181public: 4182 // Constructor for Load 4183 AtomicExpr(SourceLocation BLoc, Expr *ptr, Expr *order, QualType t, 4184 AtomicOp op, SourceLocation RP, 4185 bool TypeDependent, bool ValueDependent) 4186 : Expr(AtomicExprClass, t, VK_RValue, OK_Ordinary, 4187 TypeDependent, ValueDependent, 4188 ptr->isInstantiationDependent(), 4189 ptr->containsUnexpandedParameterPack()), 4190 BuiltinLoc(BLoc), RParenLoc(RP), Op(op) { 4191 assert(op == Load && "single-argument atomic must be load"); 4192 SubExprs[PTR] = ptr; 4193 SubExprs[ORDER] = order; 4194 NumSubExprs = 2; 4195 } 4196 4197 // Constructor for Store, Xchg, Add, Sub, And, Or, Xor 4198 AtomicExpr(SourceLocation BLoc, Expr *ptr, Expr *val, Expr *order, 4199 QualType t, AtomicOp op, SourceLocation RP, 4200 bool TypeDependent, bool ValueDependent) 4201 : Expr(AtomicExprClass, t, VK_RValue, OK_Ordinary, 4202 TypeDependent, ValueDependent, 4203 (ptr->isInstantiationDependent() || 4204 val->isInstantiationDependent()), 4205 (ptr->containsUnexpandedParameterPack() || 4206 val->containsUnexpandedParameterPack())), 4207 BuiltinLoc(BLoc), RParenLoc(RP), Op(op) { 4208 assert(!isCmpXChg() && op != Load && 4209 "two-argument atomic store or binop"); 4210 SubExprs[PTR] = ptr; 4211 SubExprs[ORDER] = order; 4212 SubExprs[VAL1] = val; 4213 NumSubExprs = 3; 4214 } 4215 4216 // Constructor for CmpXchgStrong, CmpXchgWeak 4217 AtomicExpr(SourceLocation BLoc, Expr *ptr, Expr *val1, Expr *val2, 4218 Expr *order, Expr *order_fail, QualType t, AtomicOp op, 4219 SourceLocation RP, bool TypeDependent, bool ValueDependent) 4220 : Expr(AtomicExprClass, t, VK_RValue, OK_Ordinary, 4221 TypeDependent, ValueDependent, 4222 (ptr->isInstantiationDependent() || 4223 val1->isInstantiationDependent() || 4224 val2->isInstantiationDependent()), 4225 (ptr->containsUnexpandedParameterPack() || 4226 val1->containsUnexpandedParameterPack() || 4227 val2->containsUnexpandedParameterPack())), 4228 BuiltinLoc(BLoc), RParenLoc(RP), Op(op) { 4229 assert(isCmpXChg() && "three-argument atomic must be cmpxchg"); 4230 SubExprs[PTR] = ptr; 4231 SubExprs[ORDER] = order; 4232 SubExprs[VAL1] = val1; 4233 SubExprs[VAL2] = val2; 4234 SubExprs[ORDER_FAIL] = order_fail; 4235 NumSubExprs = 5; 4236 } 4237 4238 /// \brief Build an empty AtomicExpr. 4239 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4240 4241 Expr *getPtr() const { 4242 return cast<Expr>(SubExprs[PTR]); 4243 } 4244 void setPtr(Expr *E) { 4245 SubExprs[PTR] = E; 4246 } 4247 Expr *getOrder() const { 4248 return cast<Expr>(SubExprs[ORDER]); 4249 } 4250 void setOrder(Expr *E) { 4251 SubExprs[ORDER] = E; 4252 } 4253 Expr *getVal1() const { 4254 assert(NumSubExprs >= 3); 4255 return cast<Expr>(SubExprs[VAL1]); 4256 } 4257 void setVal1(Expr *E) { 4258 assert(NumSubExprs >= 3); 4259 SubExprs[VAL1] = E; 4260 } 4261 Expr *getOrderFail() const { 4262 assert(NumSubExprs == 5); 4263 return cast<Expr>(SubExprs[ORDER_FAIL]); 4264 } 4265 void setOrderFail(Expr *E) { 4266 assert(NumSubExprs == 5); 4267 SubExprs[ORDER_FAIL] = E; 4268 } 4269 Expr *getVal2() const { 4270 assert(NumSubExprs == 5); 4271 return cast<Expr>(SubExprs[VAL2]); 4272 } 4273 void setVal2(Expr *E) { 4274 assert(NumSubExprs == 5); 4275 SubExprs[VAL2] = E; 4276 } 4277 4278 AtomicOp getOp() const { return Op; } 4279 void setOp(AtomicOp op) { Op = op; } 4280 unsigned getNumSubExprs() { return NumSubExprs; } 4281 void setNumSubExprs(unsigned num) { NumSubExprs = num; } 4282 4283 bool isVolatile() const { 4284 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4285 } 4286 4287 bool isCmpXChg() const { 4288 return getOp() == AtomicExpr::CmpXchgStrong || 4289 getOp() == AtomicExpr::CmpXchgWeak; 4290 } 4291 4292 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4293 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 4294 4295 SourceLocation getRParenLoc() const { return RParenLoc; } 4296 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 4297 4298 SourceRange getSourceRange() const { 4299 return SourceRange(BuiltinLoc, RParenLoc); 4300 } 4301 static bool classof(const Stmt *T) { 4302 return T->getStmtClass() == AtomicExprClass; 4303 } 4304 static bool classof(const AtomicExpr *) { return true; } 4305 4306 // Iterators 4307 child_range children() { 4308 return child_range(SubExprs, SubExprs+NumSubExprs); 4309 } 4310}; 4311} // end namespace clang 4312 4313#endif 4314