Expr.h revision 64f45a24b19eb89ff88f7c3ff0df9be8e861ac97
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "clang/AST/DeclAccessPair.h" 21#include "clang/AST/OperationKinds.h" 22#include "clang/AST/ASTVector.h" 23#include "clang/AST/TemplateBase.h" 24#include "clang/AST/UsuallyTinyPtrVector.h" 25#include "clang/Basic/TypeTraits.h" 26#include "llvm/ADT/APSInt.h" 27#include "llvm/ADT/APFloat.h" 28#include "llvm/ADT/SmallVector.h" 29#include "llvm/ADT/StringRef.h" 30#include <cctype> 31 32namespace clang { 33 class ASTContext; 34 class APValue; 35 class Decl; 36 class IdentifierInfo; 37 class ParmVarDecl; 38 class NamedDecl; 39 class ValueDecl; 40 class BlockDecl; 41 class CXXBaseSpecifier; 42 class CXXOperatorCallExpr; 43 class CXXMemberCallExpr; 44 class ObjCPropertyRefExpr; 45 class OpaqueValueExpr; 46 47/// \brief A simple array of base specifiers. 48typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 49 50/// Expr - This represents one expression. Note that Expr's are subclasses of 51/// Stmt. This allows an expression to be transparently used any place a Stmt 52/// is required. 53/// 54class Expr : public Stmt { 55 QualType TR; 56 57protected: 58 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 59 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 60 : Stmt(SC) 61 { 62 ExprBits.TypeDependent = TD; 63 ExprBits.ValueDependent = VD; 64 ExprBits.InstantiationDependent = ID; 65 ExprBits.ValueKind = VK; 66 ExprBits.ObjectKind = OK; 67 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 68 setType(T); 69 } 70 71 /// \brief Construct an empty expression. 72 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 73 74public: 75 QualType getType() const { return TR; } 76 void setType(QualType t) { 77 // In C++, the type of an expression is always adjusted so that it 78 // will not have reference type an expression will never have 79 // reference type (C++ [expr]p6). Use 80 // QualType::getNonReferenceType() to retrieve the non-reference 81 // type. Additionally, inspect Expr::isLvalue to determine whether 82 // an expression that is adjusted in this manner should be 83 // considered an lvalue. 84 assert((t.isNull() || !t->isReferenceType()) && 85 "Expressions can't have reference type"); 86 87 TR = t; 88 } 89 90 /// isValueDependent - Determines whether this expression is 91 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 92 /// array bound of "Chars" in the following example is 93 /// value-dependent. 94 /// @code 95 /// template<int Size, char (&Chars)[Size]> struct meta_string; 96 /// @endcode 97 bool isValueDependent() const { return ExprBits.ValueDependent; } 98 99 /// \brief Set whether this expression is value-dependent or not. 100 void setValueDependent(bool VD) { 101 ExprBits.ValueDependent = VD; 102 if (VD) 103 ExprBits.InstantiationDependent = true; 104 } 105 106 /// isTypeDependent - Determines whether this expression is 107 /// type-dependent (C++ [temp.dep.expr]), which means that its type 108 /// could change from one template instantiation to the next. For 109 /// example, the expressions "x" and "x + y" are type-dependent in 110 /// the following code, but "y" is not type-dependent: 111 /// @code 112 /// template<typename T> 113 /// void add(T x, int y) { 114 /// x + y; 115 /// } 116 /// @endcode 117 bool isTypeDependent() const { return ExprBits.TypeDependent; } 118 119 /// \brief Set whether this expression is type-dependent or not. 120 void setTypeDependent(bool TD) { 121 ExprBits.TypeDependent = TD; 122 if (TD) 123 ExprBits.InstantiationDependent = true; 124 } 125 126 /// \brief Whether this expression is instantiation-dependent, meaning that 127 /// it depends in some way on a template parameter, even if neither its type 128 /// nor (constant) value can change due to the template instantiation. 129 /// 130 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 131 /// instantiation-dependent (since it involves a template parameter \c T), but 132 /// is neither type- nor value-dependent, since the type of the inner 133 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 134 /// \c sizeof is known. 135 /// 136 /// \code 137 /// template<typename T> 138 /// void f(T x, T y) { 139 /// sizeof(sizeof(T() + T()); 140 /// } 141 /// \endcode 142 /// 143 bool isInstantiationDependent() const { 144 return ExprBits.InstantiationDependent; 145 } 146 147 /// \brief Set whether this expression is instantiation-dependent or not. 148 void setInstantiationDependent(bool ID) { 149 ExprBits.InstantiationDependent = ID; 150 } 151 152 /// \brief Whether this expression contains an unexpanded parameter 153 /// pack (for C++0x variadic templates). 154 /// 155 /// Given the following function template: 156 /// 157 /// \code 158 /// template<typename F, typename ...Types> 159 /// void forward(const F &f, Types &&...args) { 160 /// f(static_cast<Types&&>(args)...); 161 /// } 162 /// \endcode 163 /// 164 /// The expressions \c args and \c static_cast<Types&&>(args) both 165 /// contain parameter packs. 166 bool containsUnexpandedParameterPack() const { 167 return ExprBits.ContainsUnexpandedParameterPack; 168 } 169 170 /// \brief Set the bit that describes whether this expression 171 /// contains an unexpanded parameter pack. 172 void setContainsUnexpandedParameterPack(bool PP = true) { 173 ExprBits.ContainsUnexpandedParameterPack = PP; 174 } 175 176 /// getExprLoc - Return the preferred location for the arrow when diagnosing 177 /// a problem with a generic expression. 178 SourceLocation getExprLoc() const; 179 180 /// isUnusedResultAWarning - Return true if this immediate expression should 181 /// be warned about if the result is unused. If so, fill in Loc and Ranges 182 /// with location to warn on and the source range[s] to report with the 183 /// warning. 184 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 185 SourceRange &R2, ASTContext &Ctx) const; 186 187 /// isLValue - True if this expression is an "l-value" according to 188 /// the rules of the current language. C and C++ give somewhat 189 /// different rules for this concept, but in general, the result of 190 /// an l-value expression identifies a specific object whereas the 191 /// result of an r-value expression is a value detached from any 192 /// specific storage. 193 /// 194 /// C++0x divides the concept of "r-value" into pure r-values 195 /// ("pr-values") and so-called expiring values ("x-values"), which 196 /// identify specific objects that can be safely cannibalized for 197 /// their resources. This is an unfortunate abuse of terminology on 198 /// the part of the C++ committee. In Clang, when we say "r-value", 199 /// we generally mean a pr-value. 200 bool isLValue() const { return getValueKind() == VK_LValue; } 201 bool isRValue() const { return getValueKind() == VK_RValue; } 202 bool isXValue() const { return getValueKind() == VK_XValue; } 203 bool isGLValue() const { return getValueKind() != VK_RValue; } 204 205 enum LValueClassification { 206 LV_Valid, 207 LV_NotObjectType, 208 LV_IncompleteVoidType, 209 LV_DuplicateVectorComponents, 210 LV_InvalidExpression, 211 LV_InvalidMessageExpression, 212 LV_MemberFunction, 213 LV_SubObjCPropertySetting, 214 LV_ClassTemporary 215 }; 216 /// Reasons why an expression might not be an l-value. 217 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 218 219 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 220 /// does not have an incomplete type, does not have a const-qualified type, 221 /// and if it is a structure or union, does not have any member (including, 222 /// recursively, any member or element of all contained aggregates or unions) 223 /// with a const-qualified type. 224 /// 225 /// \param Loc [in] [out] - A source location which *may* be filled 226 /// in with the location of the expression making this a 227 /// non-modifiable lvalue, if specified. 228 enum isModifiableLvalueResult { 229 MLV_Valid, 230 MLV_NotObjectType, 231 MLV_IncompleteVoidType, 232 MLV_DuplicateVectorComponents, 233 MLV_InvalidExpression, 234 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 235 MLV_IncompleteType, 236 MLV_ConstQualified, 237 MLV_ArrayType, 238 MLV_NotBlockQualified, 239 MLV_ReadonlyProperty, 240 MLV_NoSetterProperty, 241 MLV_MemberFunction, 242 MLV_SubObjCPropertySetting, 243 MLV_InvalidMessageExpression, 244 MLV_ClassTemporary 245 }; 246 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 247 SourceLocation *Loc = 0) const; 248 249 /// \brief The return type of classify(). Represents the C++0x expression 250 /// taxonomy. 251 class Classification { 252 public: 253 /// \brief The various classification results. Most of these mean prvalue. 254 enum Kinds { 255 CL_LValue, 256 CL_XValue, 257 CL_Function, // Functions cannot be lvalues in C. 258 CL_Void, // Void cannot be an lvalue in C. 259 CL_AddressableVoid, // Void expression whose address can be taken in C. 260 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 261 CL_MemberFunction, // An expression referring to a member function 262 CL_SubObjCPropertySetting, 263 CL_ClassTemporary, // A prvalue of class type 264 CL_ObjCMessageRValue, // ObjC message is an rvalue 265 CL_PRValue // A prvalue for any other reason, of any other type 266 }; 267 /// \brief The results of modification testing. 268 enum ModifiableType { 269 CM_Untested, // testModifiable was false. 270 CM_Modifiable, 271 CM_RValue, // Not modifiable because it's an rvalue 272 CM_Function, // Not modifiable because it's a function; C++ only 273 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 274 CM_NotBlockQualified, // Not captured in the closure 275 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 276 CM_ConstQualified, 277 CM_ArrayType, 278 CM_IncompleteType 279 }; 280 281 private: 282 friend class Expr; 283 284 unsigned short Kind; 285 unsigned short Modifiable; 286 287 explicit Classification(Kinds k, ModifiableType m) 288 : Kind(k), Modifiable(m) 289 {} 290 291 public: 292 Classification() {} 293 294 Kinds getKind() const { return static_cast<Kinds>(Kind); } 295 ModifiableType getModifiable() const { 296 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 297 return static_cast<ModifiableType>(Modifiable); 298 } 299 bool isLValue() const { return Kind == CL_LValue; } 300 bool isXValue() const { return Kind == CL_XValue; } 301 bool isGLValue() const { return Kind <= CL_XValue; } 302 bool isPRValue() const { return Kind >= CL_Function; } 303 bool isRValue() const { return Kind >= CL_XValue; } 304 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 305 306 /// \brief Create a simple, modifiably lvalue 307 static Classification makeSimpleLValue() { 308 return Classification(CL_LValue, CM_Modifiable); 309 } 310 311 }; 312 /// \brief Classify - Classify this expression according to the C++0x 313 /// expression taxonomy. 314 /// 315 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 316 /// old lvalue vs rvalue. This function determines the type of expression this 317 /// is. There are three expression types: 318 /// - lvalues are classical lvalues as in C++03. 319 /// - prvalues are equivalent to rvalues in C++03. 320 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 321 /// function returning an rvalue reference. 322 /// lvalues and xvalues are collectively referred to as glvalues, while 323 /// prvalues and xvalues together form rvalues. 324 Classification Classify(ASTContext &Ctx) const { 325 return ClassifyImpl(Ctx, 0); 326 } 327 328 /// \brief ClassifyModifiable - Classify this expression according to the 329 /// C++0x expression taxonomy, and see if it is valid on the left side 330 /// of an assignment. 331 /// 332 /// This function extends classify in that it also tests whether the 333 /// expression is modifiable (C99 6.3.2.1p1). 334 /// \param Loc A source location that might be filled with a relevant location 335 /// if the expression is not modifiable. 336 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 337 return ClassifyImpl(Ctx, &Loc); 338 } 339 340 /// getValueKindForType - Given a formal return or parameter type, 341 /// give its value kind. 342 static ExprValueKind getValueKindForType(QualType T) { 343 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 344 return (isa<LValueReferenceType>(RT) 345 ? VK_LValue 346 : (RT->getPointeeType()->isFunctionType() 347 ? VK_LValue : VK_XValue)); 348 return VK_RValue; 349 } 350 351 /// getValueKind - The value kind that this expression produces. 352 ExprValueKind getValueKind() const { 353 return static_cast<ExprValueKind>(ExprBits.ValueKind); 354 } 355 356 /// getObjectKind - The object kind that this expression produces. 357 /// Object kinds are meaningful only for expressions that yield an 358 /// l-value or x-value. 359 ExprObjectKind getObjectKind() const { 360 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 361 } 362 363 bool isOrdinaryOrBitFieldObject() const { 364 ExprObjectKind OK = getObjectKind(); 365 return (OK == OK_Ordinary || OK == OK_BitField); 366 } 367 368 /// setValueKind - Set the value kind produced by this expression. 369 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 370 371 /// setObjectKind - Set the object kind produced by this expression. 372 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 373 374private: 375 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 376 377public: 378 379 /// \brief If this expression refers to a bit-field, retrieve the 380 /// declaration of that bit-field. 381 FieldDecl *getBitField(); 382 383 const FieldDecl *getBitField() const { 384 return const_cast<Expr*>(this)->getBitField(); 385 } 386 387 /// \brief If this expression is an l-value for an Objective C 388 /// property, find the underlying property reference expression. 389 const ObjCPropertyRefExpr *getObjCProperty() const; 390 391 /// \brief Returns whether this expression refers to a vector element. 392 bool refersToVectorElement() const; 393 394 /// \brief Returns whether this expression has a placeholder type. 395 bool hasPlaceholderType() const { 396 return getType()->isPlaceholderType(); 397 } 398 399 /// \brief Returns whether this expression has a specific placeholder type. 400 bool hasPlaceholderType(BuiltinType::Kind K) const { 401 assert(BuiltinType::isPlaceholderTypeKind(K)); 402 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 403 return BT->getKind() == K; 404 return false; 405 } 406 407 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 408 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 409 /// but also int expressions which are produced by things like comparisons in 410 /// C. 411 bool isKnownToHaveBooleanValue() const; 412 413 /// isIntegerConstantExpr - Return true if this expression is a valid integer 414 /// constant expression, and, if so, return its value in Result. If not a 415 /// valid i-c-e, return false and fill in Loc (if specified) with the location 416 /// of the invalid expression. 417 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 418 SourceLocation *Loc = 0, 419 bool isEvaluated = true) const; 420 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 421 llvm::APSInt X; 422 return isIntegerConstantExpr(X, Ctx, Loc); 423 } 424 /// isConstantInitializer - Returns true if this expression is a constant 425 /// initializer, which can be emitted at compile-time. 426 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 427 428 /// EvalStatus is a struct with detailed info about an evaluation in progress. 429 struct EvalStatus { 430 /// HasSideEffects - Whether the evaluated expression has side effects. 431 /// For example, (f() && 0) can be folded, but it still has side effects. 432 bool HasSideEffects; 433 434 /// Diag - If the expression is unfoldable, then Diag contains a note 435 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 436 /// position for the error, and DiagExpr is the expression that caused 437 /// the error. 438 /// If the expression is foldable, but not an integer constant expression, 439 /// Diag contains a note diagnostic that describes why it isn't an integer 440 /// constant expression. If the expression *is* an integer constant 441 /// expression, then Diag will be zero. 442 unsigned Diag; 443 const Expr *DiagExpr; 444 SourceLocation DiagLoc; 445 446 EvalStatus() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 447 448 // hasSideEffects - Return true if the evaluated expression has 449 // side effects. 450 bool hasSideEffects() const { 451 return HasSideEffects; 452 } 453 }; 454 455 /// EvalResult is a struct with detailed info about an evaluated expression. 456 struct EvalResult : EvalStatus { 457 /// Val - This is the value the expression can be folded to. 458 APValue Val; 459 460 // isGlobalLValue - Return true if the evaluated lvalue expression 461 // is global. 462 bool isGlobalLValue() const; 463 }; 464 465 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 466 /// an rvalue using any crazy technique (that has nothing to do with language 467 /// standards) that we want to, even if the expression has side-effects. If 468 /// this function returns true, it returns the folded constant in Result. If 469 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 470 /// applied. 471 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 472 473 /// EvaluateAsBooleanCondition - Return true if this is a constant 474 /// which we we can fold and convert to a boolean condition using 475 /// any crazy technique that we want to, even if the expression has 476 /// side-effects. 477 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 478 479 /// EvaluateAsInt - Return true if this is a constant which we can fold and 480 /// convert to an integer without side-effects, using any crazy technique that 481 /// we want to. 482 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx) const; 483 484 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 485 /// constant folded without side-effects, but discard the result. 486 bool isEvaluatable(const ASTContext &Ctx) const; 487 488 /// HasSideEffects - This routine returns true for all those expressions 489 /// which must be evaluated each time and must not be optimized away 490 /// or evaluated at compile time. Example is a function call, volatile 491 /// variable read. 492 bool HasSideEffects(const ASTContext &Ctx) const; 493 494 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 495 /// integer. This must be called on an expression that constant folds to an 496 /// integer. 497 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 498 499 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 500 /// lvalue with link time known address, with no side-effects. 501 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 502 503 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 504 /// lvalue, even if the expression has side-effects. 505 bool EvaluateAsAnyLValue(EvalResult &Result, const ASTContext &Ctx) const; 506 507 /// \brief Enumeration used to describe the kind of Null pointer constant 508 /// returned from \c isNullPointerConstant(). 509 enum NullPointerConstantKind { 510 /// \brief Expression is not a Null pointer constant. 511 NPCK_NotNull = 0, 512 513 /// \brief Expression is a Null pointer constant built from a zero integer. 514 NPCK_ZeroInteger, 515 516 /// \brief Expression is a C++0X nullptr. 517 NPCK_CXX0X_nullptr, 518 519 /// \brief Expression is a GNU-style __null constant. 520 NPCK_GNUNull 521 }; 522 523 /// \brief Enumeration used to describe how \c isNullPointerConstant() 524 /// should cope with value-dependent expressions. 525 enum NullPointerConstantValueDependence { 526 /// \brief Specifies that the expression should never be value-dependent. 527 NPC_NeverValueDependent = 0, 528 529 /// \brief Specifies that a value-dependent expression of integral or 530 /// dependent type should be considered a null pointer constant. 531 NPC_ValueDependentIsNull, 532 533 /// \brief Specifies that a value-dependent expression should be considered 534 /// to never be a null pointer constant. 535 NPC_ValueDependentIsNotNull 536 }; 537 538 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 539 /// a Null pointer constant. The return value can further distinguish the 540 /// kind of NULL pointer constant that was detected. 541 NullPointerConstantKind isNullPointerConstant( 542 ASTContext &Ctx, 543 NullPointerConstantValueDependence NPC) const; 544 545 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 546 /// write barrier. 547 bool isOBJCGCCandidate(ASTContext &Ctx) const; 548 549 /// \brief Returns true if this expression is a bound member function. 550 bool isBoundMemberFunction(ASTContext &Ctx) const; 551 552 /// \brief Given an expression of bound-member type, find the type 553 /// of the member. Returns null if this is an *overloaded* bound 554 /// member expression. 555 static QualType findBoundMemberType(const Expr *expr); 556 557 /// \brief Result type of CanThrow(). 558 enum CanThrowResult { 559 CT_Cannot, 560 CT_Dependent, 561 CT_Can 562 }; 563 /// \brief Test if this expression, if evaluated, might throw, according to 564 /// the rules of C++ [expr.unary.noexcept]. 565 CanThrowResult CanThrow(ASTContext &C) const; 566 567 /// IgnoreImpCasts - Skip past any implicit casts which might 568 /// surround this expression. Only skips ImplicitCastExprs. 569 Expr *IgnoreImpCasts(); 570 571 /// IgnoreImplicit - Skip past any implicit AST nodes which might 572 /// surround this expression. 573 Expr *IgnoreImplicit() { return cast<Expr>(Stmt::IgnoreImplicit()); } 574 575 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 576 /// its subexpression. If that subexpression is also a ParenExpr, 577 /// then this method recursively returns its subexpression, and so forth. 578 /// Otherwise, the method returns the current Expr. 579 Expr *IgnoreParens(); 580 581 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 582 /// or CastExprs, returning their operand. 583 Expr *IgnoreParenCasts(); 584 585 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 586 /// ParenExpr or ImplicitCastExprs, returning their operand. 587 Expr *IgnoreParenImpCasts(); 588 589 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 590 /// call to a conversion operator, return the argument. 591 Expr *IgnoreConversionOperator(); 592 593 const Expr *IgnoreConversionOperator() const { 594 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 595 } 596 597 const Expr *IgnoreParenImpCasts() const { 598 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 599 } 600 601 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 602 /// CastExprs that represent lvalue casts, returning their operand. 603 Expr *IgnoreParenLValueCasts(); 604 605 const Expr *IgnoreParenLValueCasts() const { 606 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 607 } 608 609 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 610 /// value (including ptr->int casts of the same size). Strip off any 611 /// ParenExpr or CastExprs, returning their operand. 612 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 613 614 /// \brief Determine whether this expression is a default function argument. 615 /// 616 /// Default arguments are implicitly generated in the abstract syntax tree 617 /// by semantic analysis for function calls, object constructions, etc. in 618 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 619 /// this routine also looks through any implicit casts to determine whether 620 /// the expression is a default argument. 621 bool isDefaultArgument() const; 622 623 /// \brief Determine whether the result of this expression is a 624 /// temporary object of the given class type. 625 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 626 627 /// \brief Whether this expression is an implicit reference to 'this' in C++. 628 bool isImplicitCXXThis() const; 629 630 const Expr *IgnoreImpCasts() const { 631 return const_cast<Expr*>(this)->IgnoreImpCasts(); 632 } 633 const Expr *IgnoreParens() const { 634 return const_cast<Expr*>(this)->IgnoreParens(); 635 } 636 const Expr *IgnoreParenCasts() const { 637 return const_cast<Expr*>(this)->IgnoreParenCasts(); 638 } 639 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 640 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 641 } 642 643 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 644 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 645 646 static bool classof(const Stmt *T) { 647 return T->getStmtClass() >= firstExprConstant && 648 T->getStmtClass() <= lastExprConstant; 649 } 650 static bool classof(const Expr *) { return true; } 651}; 652 653 654//===----------------------------------------------------------------------===// 655// Primary Expressions. 656//===----------------------------------------------------------------------===// 657 658/// OpaqueValueExpr - An expression referring to an opaque object of a 659/// fixed type and value class. These don't correspond to concrete 660/// syntax; instead they're used to express operations (usually copy 661/// operations) on values whose source is generally obvious from 662/// context. 663class OpaqueValueExpr : public Expr { 664 friend class ASTStmtReader; 665 Expr *SourceExpr; 666 SourceLocation Loc; 667 668public: 669 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 670 ExprObjectKind OK = OK_Ordinary) 671 : Expr(OpaqueValueExprClass, T, VK, OK, 672 T->isDependentType(), T->isDependentType(), 673 T->isInstantiationDependentType(), 674 false), 675 SourceExpr(0), Loc(Loc) { 676 } 677 678 /// Given an expression which invokes a copy constructor --- i.e. a 679 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 680 /// find the OpaqueValueExpr that's the source of the construction. 681 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 682 683 explicit OpaqueValueExpr(EmptyShell Empty) 684 : Expr(OpaqueValueExprClass, Empty) { } 685 686 /// \brief Retrieve the location of this expression. 687 SourceLocation getLocation() const { return Loc; } 688 689 SourceRange getSourceRange() const { 690 if (SourceExpr) return SourceExpr->getSourceRange(); 691 return Loc; 692 } 693 SourceLocation getExprLoc() const { 694 if (SourceExpr) return SourceExpr->getExprLoc(); 695 return Loc; 696 } 697 698 child_range children() { return child_range(); } 699 700 /// The source expression of an opaque value expression is the 701 /// expression which originally generated the value. This is 702 /// provided as a convenience for analyses that don't wish to 703 /// precisely model the execution behavior of the program. 704 /// 705 /// The source expression is typically set when building the 706 /// expression which binds the opaque value expression in the first 707 /// place. 708 Expr *getSourceExpr() const { return SourceExpr; } 709 void setSourceExpr(Expr *e) { SourceExpr = e; } 710 711 static bool classof(const Stmt *T) { 712 return T->getStmtClass() == OpaqueValueExprClass; 713 } 714 static bool classof(const OpaqueValueExpr *) { return true; } 715}; 716 717/// \brief A reference to a declared variable, function, enum, etc. 718/// [C99 6.5.1p2] 719/// 720/// This encodes all the information about how a declaration is referenced 721/// within an expression. 722/// 723/// There are several optional constructs attached to DeclRefExprs only when 724/// they apply in order to conserve memory. These are laid out past the end of 725/// the object, and flags in the DeclRefExprBitfield track whether they exist: 726/// 727/// DeclRefExprBits.HasQualifier: 728/// Specifies when this declaration reference expression has a C++ 729/// nested-name-specifier. 730/// DeclRefExprBits.HasFoundDecl: 731/// Specifies when this declaration reference expression has a record of 732/// a NamedDecl (different from the referenced ValueDecl) which was found 733/// during name lookup and/or overload resolution. 734/// DeclRefExprBits.HasExplicitTemplateArgs: 735/// Specifies when this declaration reference expression has an explicit 736/// C++ template argument list. 737class DeclRefExpr : public Expr { 738 /// \brief The declaration that we are referencing. 739 ValueDecl *D; 740 741 /// \brief The location of the declaration name itself. 742 SourceLocation Loc; 743 744 /// \brief Provides source/type location info for the declaration name 745 /// embedded in D. 746 DeclarationNameLoc DNLoc; 747 748 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 749 NestedNameSpecifierLoc &getInternalQualifierLoc() { 750 assert(hasQualifier()); 751 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 752 } 753 754 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 755 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 756 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 757 } 758 759 /// \brief Test whether there is a distinct FoundDecl attached to the end of 760 /// this DRE. 761 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 762 763 /// \brief Helper to retrieve the optional NamedDecl through which this 764 /// reference occured. 765 NamedDecl *&getInternalFoundDecl() { 766 assert(hasFoundDecl()); 767 if (hasQualifier()) 768 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 769 return *reinterpret_cast<NamedDecl **>(this + 1); 770 } 771 772 /// \brief Helper to retrieve the optional NamedDecl through which this 773 /// reference occured. 774 NamedDecl *getInternalFoundDecl() const { 775 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 776 } 777 778 DeclRefExpr(NestedNameSpecifierLoc QualifierLoc, 779 ValueDecl *D, const DeclarationNameInfo &NameInfo, 780 NamedDecl *FoundD, 781 const TemplateArgumentListInfo *TemplateArgs, 782 QualType T, ExprValueKind VK); 783 784 /// \brief Construct an empty declaration reference expression. 785 explicit DeclRefExpr(EmptyShell Empty) 786 : Expr(DeclRefExprClass, Empty) { } 787 788 /// \brief Computes the type- and value-dependence flags for this 789 /// declaration reference expression. 790 void computeDependence(); 791 792public: 793 DeclRefExpr(ValueDecl *D, QualType T, ExprValueKind VK, SourceLocation L, 794 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 795 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 796 D(D), Loc(L), DNLoc(LocInfo) { 797 DeclRefExprBits.HasQualifier = 0; 798 DeclRefExprBits.HasExplicitTemplateArgs = 0; 799 DeclRefExprBits.HasFoundDecl = 0; 800 DeclRefExprBits.HadMultipleCandidates = 0; 801 computeDependence(); 802 } 803 804 static DeclRefExpr *Create(ASTContext &Context, 805 NestedNameSpecifierLoc QualifierLoc, 806 ValueDecl *D, 807 SourceLocation NameLoc, 808 QualType T, ExprValueKind VK, 809 NamedDecl *FoundD = 0, 810 const TemplateArgumentListInfo *TemplateArgs = 0); 811 812 static DeclRefExpr *Create(ASTContext &Context, 813 NestedNameSpecifierLoc QualifierLoc, 814 ValueDecl *D, 815 const DeclarationNameInfo &NameInfo, 816 QualType T, ExprValueKind VK, 817 NamedDecl *FoundD = 0, 818 const TemplateArgumentListInfo *TemplateArgs = 0); 819 820 /// \brief Construct an empty declaration reference expression. 821 static DeclRefExpr *CreateEmpty(ASTContext &Context, 822 bool HasQualifier, 823 bool HasFoundDecl, 824 bool HasExplicitTemplateArgs, 825 unsigned NumTemplateArgs); 826 827 ValueDecl *getDecl() { return D; } 828 const ValueDecl *getDecl() const { return D; } 829 void setDecl(ValueDecl *NewD) { D = NewD; } 830 831 DeclarationNameInfo getNameInfo() const { 832 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 833 } 834 835 SourceLocation getLocation() const { return Loc; } 836 void setLocation(SourceLocation L) { Loc = L; } 837 SourceRange getSourceRange() const; 838 839 /// \brief Determine whether this declaration reference was preceded by a 840 /// C++ nested-name-specifier, e.g., \c N::foo. 841 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 842 843 /// \brief If the name was qualified, retrieves the nested-name-specifier 844 /// that precedes the name. Otherwise, returns NULL. 845 NestedNameSpecifier *getQualifier() const { 846 if (!hasQualifier()) 847 return 0; 848 849 return getInternalQualifierLoc().getNestedNameSpecifier(); 850 } 851 852 /// \brief If the name was qualified, retrieves the nested-name-specifier 853 /// that precedes the name, with source-location information. 854 NestedNameSpecifierLoc getQualifierLoc() const { 855 if (!hasQualifier()) 856 return NestedNameSpecifierLoc(); 857 858 return getInternalQualifierLoc(); 859 } 860 861 /// \brief Get the NamedDecl through which this reference occured. 862 /// 863 /// This Decl may be different from the ValueDecl actually referred to in the 864 /// presence of using declarations, etc. It always returns non-NULL, and may 865 /// simple return the ValueDecl when appropriate. 866 NamedDecl *getFoundDecl() { 867 return hasFoundDecl() ? getInternalFoundDecl() : D; 868 } 869 870 /// \brief Get the NamedDecl through which this reference occurred. 871 /// See non-const variant. 872 const NamedDecl *getFoundDecl() const { 873 return hasFoundDecl() ? getInternalFoundDecl() : D; 874 } 875 876 /// \brief Determines whether this declaration reference was followed by an 877 /// explict template argument list. 878 bool hasExplicitTemplateArgs() const { 879 return DeclRefExprBits.HasExplicitTemplateArgs; 880 } 881 882 /// \brief Retrieve the explicit template argument list that followed the 883 /// member template name. 884 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 885 assert(hasExplicitTemplateArgs()); 886 if (hasFoundDecl()) 887 return *reinterpret_cast<ASTTemplateArgumentListInfo *>( 888 &getInternalFoundDecl() + 1); 889 890 if (hasQualifier()) 891 return *reinterpret_cast<ASTTemplateArgumentListInfo *>( 892 &getInternalQualifierLoc() + 1); 893 894 return *reinterpret_cast<ASTTemplateArgumentListInfo *>(this + 1); 895 } 896 897 /// \brief Retrieve the explicit template argument list that followed the 898 /// member template name. 899 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 900 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 901 } 902 903 /// \brief Retrieves the optional explicit template arguments. 904 /// This points to the same data as getExplicitTemplateArgs(), but 905 /// returns null if there are no explicit template arguments. 906 const ASTTemplateArgumentListInfo *getExplicitTemplateArgsOpt() const { 907 if (!hasExplicitTemplateArgs()) return 0; 908 return &getExplicitTemplateArgs(); 909 } 910 911 /// \brief Copies the template arguments (if present) into the given 912 /// structure. 913 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 914 if (hasExplicitTemplateArgs()) 915 getExplicitTemplateArgs().copyInto(List); 916 } 917 918 /// \brief Retrieve the location of the left angle bracket following the 919 /// member name ('<'), if any. 920 SourceLocation getLAngleLoc() const { 921 if (!hasExplicitTemplateArgs()) 922 return SourceLocation(); 923 924 return getExplicitTemplateArgs().LAngleLoc; 925 } 926 927 /// \brief Retrieve the template arguments provided as part of this 928 /// template-id. 929 const TemplateArgumentLoc *getTemplateArgs() const { 930 if (!hasExplicitTemplateArgs()) 931 return 0; 932 933 return getExplicitTemplateArgs().getTemplateArgs(); 934 } 935 936 /// \brief Retrieve the number of template arguments provided as part of this 937 /// template-id. 938 unsigned getNumTemplateArgs() const { 939 if (!hasExplicitTemplateArgs()) 940 return 0; 941 942 return getExplicitTemplateArgs().NumTemplateArgs; 943 } 944 945 /// \brief Retrieve the location of the right angle bracket following the 946 /// template arguments ('>'). 947 SourceLocation getRAngleLoc() const { 948 if (!hasExplicitTemplateArgs()) 949 return SourceLocation(); 950 951 return getExplicitTemplateArgs().RAngleLoc; 952 } 953 954 /// \brief Returns true if this expression refers to a function that 955 /// was resolved from an overloaded set having size greater than 1. 956 bool hadMultipleCandidates() const { 957 return DeclRefExprBits.HadMultipleCandidates; 958 } 959 /// \brief Sets the flag telling whether this expression refers to 960 /// a function that was resolved from an overloaded set having size 961 /// greater than 1. 962 void setHadMultipleCandidates(bool V = true) { 963 DeclRefExprBits.HadMultipleCandidates = V; 964 } 965 966 static bool classof(const Stmt *T) { 967 return T->getStmtClass() == DeclRefExprClass; 968 } 969 static bool classof(const DeclRefExpr *) { return true; } 970 971 // Iterators 972 child_range children() { return child_range(); } 973 974 friend class ASTStmtReader; 975 friend class ASTStmtWriter; 976}; 977 978/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 979class PredefinedExpr : public Expr { 980public: 981 enum IdentType { 982 Func, 983 Function, 984 PrettyFunction, 985 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 986 /// 'virtual' keyword is omitted for virtual member functions. 987 PrettyFunctionNoVirtual 988 }; 989 990private: 991 SourceLocation Loc; 992 IdentType Type; 993public: 994 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 995 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 996 type->isDependentType(), type->isDependentType(), 997 type->isInstantiationDependentType(), 998 /*ContainsUnexpandedParameterPack=*/false), 999 Loc(l), Type(IT) {} 1000 1001 /// \brief Construct an empty predefined expression. 1002 explicit PredefinedExpr(EmptyShell Empty) 1003 : Expr(PredefinedExprClass, Empty) { } 1004 1005 IdentType getIdentType() const { return Type; } 1006 void setIdentType(IdentType IT) { Type = IT; } 1007 1008 SourceLocation getLocation() const { return Loc; } 1009 void setLocation(SourceLocation L) { Loc = L; } 1010 1011 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1012 1013 SourceRange getSourceRange() const { return SourceRange(Loc); } 1014 1015 static bool classof(const Stmt *T) { 1016 return T->getStmtClass() == PredefinedExprClass; 1017 } 1018 static bool classof(const PredefinedExpr *) { return true; } 1019 1020 // Iterators 1021 child_range children() { return child_range(); } 1022}; 1023 1024/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1025/// leaking memory. 1026/// 1027/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1028/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1029/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1030/// the APFloat/APInt values will never get freed. APNumericStorage uses 1031/// ASTContext's allocator for memory allocation. 1032class APNumericStorage { 1033 unsigned BitWidth; 1034 union { 1035 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1036 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1037 }; 1038 1039 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1040 1041 APNumericStorage(const APNumericStorage&); // do not implement 1042 APNumericStorage& operator=(const APNumericStorage&); // do not implement 1043 1044protected: 1045 APNumericStorage() : BitWidth(0), VAL(0) { } 1046 1047 llvm::APInt getIntValue() const { 1048 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1049 if (NumWords > 1) 1050 return llvm::APInt(BitWidth, NumWords, pVal); 1051 else 1052 return llvm::APInt(BitWidth, VAL); 1053 } 1054 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1055}; 1056 1057class APIntStorage : public APNumericStorage { 1058public: 1059 llvm::APInt getValue() const { return getIntValue(); } 1060 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1061}; 1062 1063class APFloatStorage : public APNumericStorage { 1064public: 1065 llvm::APFloat getValue() const { return llvm::APFloat(getIntValue()); } 1066 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1067 setIntValue(C, Val.bitcastToAPInt()); 1068 } 1069}; 1070 1071class IntegerLiteral : public Expr { 1072 APIntStorage Num; 1073 SourceLocation Loc; 1074 1075 /// \brief Construct an empty integer literal. 1076 explicit IntegerLiteral(EmptyShell Empty) 1077 : Expr(IntegerLiteralClass, Empty) { } 1078 1079public: 1080 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1081 // or UnsignedLongLongTy 1082 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 1083 QualType type, SourceLocation l) 1084 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1085 false, false), 1086 Loc(l) { 1087 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 1088 assert(V.getBitWidth() == C.getIntWidth(type) && 1089 "Integer type is not the correct size for constant."); 1090 setValue(C, V); 1091 } 1092 1093 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1094 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1095 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1096 /// \param V - the value that the returned integer literal contains. 1097 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1098 QualType type, SourceLocation l); 1099 /// \brief Returns a new empty integer literal. 1100 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1101 1102 llvm::APInt getValue() const { return Num.getValue(); } 1103 SourceRange getSourceRange() const { return SourceRange(Loc); } 1104 1105 /// \brief Retrieve the location of the literal. 1106 SourceLocation getLocation() const { return Loc; } 1107 1108 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 1109 void setLocation(SourceLocation Location) { Loc = Location; } 1110 1111 static bool classof(const Stmt *T) { 1112 return T->getStmtClass() == IntegerLiteralClass; 1113 } 1114 static bool classof(const IntegerLiteral *) { return true; } 1115 1116 // Iterators 1117 child_range children() { return child_range(); } 1118}; 1119 1120class CharacterLiteral : public Expr { 1121public: 1122 enum CharacterKind { 1123 Ascii, 1124 Wide, 1125 UTF16, 1126 UTF32 1127 }; 1128 1129private: 1130 unsigned Value; 1131 SourceLocation Loc; 1132 unsigned Kind : 2; 1133public: 1134 // type should be IntTy 1135 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1136 SourceLocation l) 1137 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1138 false, false), 1139 Value(value), Loc(l), Kind(kind) { 1140 } 1141 1142 /// \brief Construct an empty character literal. 1143 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1144 1145 SourceLocation getLocation() const { return Loc; } 1146 CharacterKind getKind() const { return static_cast<CharacterKind>(Kind); } 1147 1148 SourceRange getSourceRange() const { return SourceRange(Loc); } 1149 1150 unsigned getValue() const { return Value; } 1151 1152 void setLocation(SourceLocation Location) { Loc = Location; } 1153 void setKind(CharacterKind kind) { Kind = kind; } 1154 void setValue(unsigned Val) { Value = Val; } 1155 1156 static bool classof(const Stmt *T) { 1157 return T->getStmtClass() == CharacterLiteralClass; 1158 } 1159 static bool classof(const CharacterLiteral *) { return true; } 1160 1161 // Iterators 1162 child_range children() { return child_range(); } 1163}; 1164 1165class FloatingLiteral : public Expr { 1166 APFloatStorage Num; 1167 bool IsExact : 1; 1168 SourceLocation Loc; 1169 1170 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1171 QualType Type, SourceLocation L) 1172 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1173 false, false), 1174 IsExact(isexact), Loc(L) { 1175 setValue(C, V); 1176 } 1177 1178 /// \brief Construct an empty floating-point literal. 1179 explicit FloatingLiteral(EmptyShell Empty) 1180 : Expr(FloatingLiteralClass, Empty), IsExact(false) { } 1181 1182public: 1183 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1184 bool isexact, QualType Type, SourceLocation L); 1185 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1186 1187 llvm::APFloat getValue() const { return Num.getValue(); } 1188 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1189 Num.setValue(C, Val); 1190 } 1191 1192 bool isExact() const { return IsExact; } 1193 void setExact(bool E) { IsExact = E; } 1194 1195 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1196 /// double. Note that this may cause loss of precision, but is useful for 1197 /// debugging dumps, etc. 1198 double getValueAsApproximateDouble() const; 1199 1200 SourceLocation getLocation() const { return Loc; } 1201 void setLocation(SourceLocation L) { Loc = L; } 1202 1203 SourceRange getSourceRange() const { return SourceRange(Loc); } 1204 1205 static bool classof(const Stmt *T) { 1206 return T->getStmtClass() == FloatingLiteralClass; 1207 } 1208 static bool classof(const FloatingLiteral *) { return true; } 1209 1210 // Iterators 1211 child_range children() { return child_range(); } 1212}; 1213 1214/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1215/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1216/// IntegerLiteral classes. Instances of this class always have a Complex type 1217/// whose element type matches the subexpression. 1218/// 1219class ImaginaryLiteral : public Expr { 1220 Stmt *Val; 1221public: 1222 ImaginaryLiteral(Expr *val, QualType Ty) 1223 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1224 false, false), 1225 Val(val) {} 1226 1227 /// \brief Build an empty imaginary literal. 1228 explicit ImaginaryLiteral(EmptyShell Empty) 1229 : Expr(ImaginaryLiteralClass, Empty) { } 1230 1231 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1232 Expr *getSubExpr() { return cast<Expr>(Val); } 1233 void setSubExpr(Expr *E) { Val = E; } 1234 1235 SourceRange getSourceRange() const { return Val->getSourceRange(); } 1236 static bool classof(const Stmt *T) { 1237 return T->getStmtClass() == ImaginaryLiteralClass; 1238 } 1239 static bool classof(const ImaginaryLiteral *) { return true; } 1240 1241 // Iterators 1242 child_range children() { return child_range(&Val, &Val+1); } 1243}; 1244 1245/// StringLiteral - This represents a string literal expression, e.g. "foo" 1246/// or L"bar" (wide strings). The actual string is returned by getStrData() 1247/// is NOT null-terminated, and the length of the string is determined by 1248/// calling getByteLength(). The C type for a string is always a 1249/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1250/// not. 1251/// 1252/// Note that strings in C can be formed by concatenation of multiple string 1253/// literal pptokens in translation phase #6. This keeps track of the locations 1254/// of each of these pieces. 1255/// 1256/// Strings in C can also be truncated and extended by assigning into arrays, 1257/// e.g. with constructs like: 1258/// char X[2] = "foobar"; 1259/// In this case, getByteLength() will return 6, but the string literal will 1260/// have type "char[2]". 1261class StringLiteral : public Expr { 1262public: 1263 enum StringKind { 1264 Ascii, 1265 Wide, 1266 UTF8, 1267 UTF16, 1268 UTF32 1269 }; 1270 1271private: 1272 friend class ASTStmtReader; 1273 1274 union { 1275 const char *asChar; 1276 const uint16_t *asUInt16; 1277 const uint32_t *asUInt32; 1278 } StrData; 1279 unsigned Length; 1280 unsigned CharByteWidth; 1281 unsigned NumConcatenated; 1282 unsigned Kind : 3; 1283 bool IsPascal : 1; 1284 SourceLocation TokLocs[1]; 1285 1286 StringLiteral(QualType Ty) : 1287 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1288 false) {} 1289 1290 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1291 1292public: 1293 /// This is the "fully general" constructor that allows representation of 1294 /// strings formed from multiple concatenated tokens. 1295 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1296 bool Pascal, QualType Ty, 1297 const SourceLocation *Loc, unsigned NumStrs); 1298 1299 /// Simple constructor for string literals made from one token. 1300 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1301 bool Pascal, QualType Ty, 1302 SourceLocation Loc) { 1303 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1304 } 1305 1306 /// \brief Construct an empty string literal. 1307 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1308 1309 StringRef getString() const { 1310 assert(CharByteWidth==1 1311 && "This function is used in places that assume strings use char"); 1312 return StringRef(StrData.asChar, getByteLength()); 1313 } 1314 1315 /// Allow clients that need the byte representation, such as ASTWriterStmt 1316 /// ::VisitStringLiteral(), access. 1317 StringRef getBytes() const { 1318 // FIXME: StringRef may not be the right type to use as a result for this... 1319 assert((CharByteWidth==1 || CharByteWidth==2 || CharByteWidth==4) 1320 && "unsupported CharByteWidth"); 1321 if (CharByteWidth==4) { 1322 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1323 getByteLength()); 1324 } else if (CharByteWidth==2) { 1325 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1326 getByteLength()); 1327 } else { 1328 return StringRef(StrData.asChar, getByteLength()); 1329 } 1330 } 1331 1332 uint32_t getCodeUnit(size_t i) const { 1333 assert(i<Length && "out of bounds access"); 1334 assert((CharByteWidth==1 || CharByteWidth==2 || CharByteWidth==4) 1335 && "unsupported CharByteWidth"); 1336 if (CharByteWidth==4) { 1337 return StrData.asUInt32[i]; 1338 } else if (CharByteWidth==2) { 1339 return StrData.asUInt16[i]; 1340 } else { 1341 return static_cast<unsigned char>(StrData.asChar[i]); 1342 } 1343 } 1344 1345 unsigned getByteLength() const { return CharByteWidth*Length; } 1346 unsigned getLength() const { return Length; } 1347 unsigned getCharByteWidth() const { return CharByteWidth; } 1348 1349 /// \brief Sets the string data to the given string data. 1350 void setString(ASTContext &C, StringRef Str, 1351 StringKind Kind, bool IsPascal); 1352 1353 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1354 1355 1356 bool isAscii() const { return Kind == Ascii; } 1357 bool isWide() const { return Kind == Wide; } 1358 bool isUTF8() const { return Kind == UTF8; } 1359 bool isUTF16() const { return Kind == UTF16; } 1360 bool isUTF32() const { return Kind == UTF32; } 1361 bool isPascal() const { return IsPascal; } 1362 1363 bool containsNonAsciiOrNull() const { 1364 StringRef Str = getString(); 1365 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1366 if (!isascii(Str[i]) || !Str[i]) 1367 return true; 1368 return false; 1369 } 1370 1371 /// getNumConcatenated - Get the number of string literal tokens that were 1372 /// concatenated in translation phase #6 to form this string literal. 1373 unsigned getNumConcatenated() const { return NumConcatenated; } 1374 1375 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1376 assert(TokNum < NumConcatenated && "Invalid tok number"); 1377 return TokLocs[TokNum]; 1378 } 1379 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1380 assert(TokNum < NumConcatenated && "Invalid tok number"); 1381 TokLocs[TokNum] = L; 1382 } 1383 1384 /// getLocationOfByte - Return a source location that points to the specified 1385 /// byte of this string literal. 1386 /// 1387 /// Strings are amazingly complex. They can be formed from multiple tokens 1388 /// and can have escape sequences in them in addition to the usual trigraph 1389 /// and escaped newline business. This routine handles this complexity. 1390 /// 1391 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1392 const LangOptions &Features, 1393 const TargetInfo &Target) const; 1394 1395 typedef const SourceLocation *tokloc_iterator; 1396 tokloc_iterator tokloc_begin() const { return TokLocs; } 1397 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1398 1399 SourceRange getSourceRange() const { 1400 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1401 } 1402 static bool classof(const Stmt *T) { 1403 return T->getStmtClass() == StringLiteralClass; 1404 } 1405 static bool classof(const StringLiteral *) { return true; } 1406 1407 // Iterators 1408 child_range children() { return child_range(); } 1409}; 1410 1411/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1412/// AST node is only formed if full location information is requested. 1413class ParenExpr : public Expr { 1414 SourceLocation L, R; 1415 Stmt *Val; 1416public: 1417 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1418 : Expr(ParenExprClass, val->getType(), 1419 val->getValueKind(), val->getObjectKind(), 1420 val->isTypeDependent(), val->isValueDependent(), 1421 val->isInstantiationDependent(), 1422 val->containsUnexpandedParameterPack()), 1423 L(l), R(r), Val(val) {} 1424 1425 /// \brief Construct an empty parenthesized expression. 1426 explicit ParenExpr(EmptyShell Empty) 1427 : Expr(ParenExprClass, Empty) { } 1428 1429 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1430 Expr *getSubExpr() { return cast<Expr>(Val); } 1431 void setSubExpr(Expr *E) { Val = E; } 1432 1433 SourceRange getSourceRange() const { return SourceRange(L, R); } 1434 1435 /// \brief Get the location of the left parentheses '('. 1436 SourceLocation getLParen() const { return L; } 1437 void setLParen(SourceLocation Loc) { L = Loc; } 1438 1439 /// \brief Get the location of the right parentheses ')'. 1440 SourceLocation getRParen() const { return R; } 1441 void setRParen(SourceLocation Loc) { R = Loc; } 1442 1443 static bool classof(const Stmt *T) { 1444 return T->getStmtClass() == ParenExprClass; 1445 } 1446 static bool classof(const ParenExpr *) { return true; } 1447 1448 // Iterators 1449 child_range children() { return child_range(&Val, &Val+1); } 1450}; 1451 1452 1453/// UnaryOperator - This represents the unary-expression's (except sizeof and 1454/// alignof), the postinc/postdec operators from postfix-expression, and various 1455/// extensions. 1456/// 1457/// Notes on various nodes: 1458/// 1459/// Real/Imag - These return the real/imag part of a complex operand. If 1460/// applied to a non-complex value, the former returns its operand and the 1461/// later returns zero in the type of the operand. 1462/// 1463class UnaryOperator : public Expr { 1464public: 1465 typedef UnaryOperatorKind Opcode; 1466 1467private: 1468 unsigned Opc : 5; 1469 SourceLocation Loc; 1470 Stmt *Val; 1471public: 1472 1473 UnaryOperator(Expr *input, Opcode opc, QualType type, 1474 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1475 : Expr(UnaryOperatorClass, type, VK, OK, 1476 input->isTypeDependent() || type->isDependentType(), 1477 input->isValueDependent(), 1478 (input->isInstantiationDependent() || 1479 type->isInstantiationDependentType()), 1480 input->containsUnexpandedParameterPack()), 1481 Opc(opc), Loc(l), Val(input) {} 1482 1483 /// \brief Build an empty unary operator. 1484 explicit UnaryOperator(EmptyShell Empty) 1485 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1486 1487 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1488 void setOpcode(Opcode O) { Opc = O; } 1489 1490 Expr *getSubExpr() const { return cast<Expr>(Val); } 1491 void setSubExpr(Expr *E) { Val = E; } 1492 1493 /// getOperatorLoc - Return the location of the operator. 1494 SourceLocation getOperatorLoc() const { return Loc; } 1495 void setOperatorLoc(SourceLocation L) { Loc = L; } 1496 1497 /// isPostfix - Return true if this is a postfix operation, like x++. 1498 static bool isPostfix(Opcode Op) { 1499 return Op == UO_PostInc || Op == UO_PostDec; 1500 } 1501 1502 /// isPrefix - Return true if this is a prefix operation, like --x. 1503 static bool isPrefix(Opcode Op) { 1504 return Op == UO_PreInc || Op == UO_PreDec; 1505 } 1506 1507 bool isPrefix() const { return isPrefix(getOpcode()); } 1508 bool isPostfix() const { return isPostfix(getOpcode()); } 1509 1510 static bool isIncrementOp(Opcode Op) { 1511 return Op == UO_PreInc || Op == UO_PostInc; 1512 } 1513 bool isIncrementOp() const { 1514 return isIncrementOp(getOpcode()); 1515 } 1516 1517 static bool isDecrementOp(Opcode Op) { 1518 return Op == UO_PreDec || Op == UO_PostDec; 1519 } 1520 bool isDecrementOp() const { 1521 return isDecrementOp(getOpcode()); 1522 } 1523 1524 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1525 bool isIncrementDecrementOp() const { 1526 return isIncrementDecrementOp(getOpcode()); 1527 } 1528 1529 static bool isArithmeticOp(Opcode Op) { 1530 return Op >= UO_Plus && Op <= UO_LNot; 1531 } 1532 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1533 1534 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1535 /// corresponds to, e.g. "sizeof" or "[pre]++" 1536 static const char *getOpcodeStr(Opcode Op); 1537 1538 /// \brief Retrieve the unary opcode that corresponds to the given 1539 /// overloaded operator. 1540 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1541 1542 /// \brief Retrieve the overloaded operator kind that corresponds to 1543 /// the given unary opcode. 1544 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1545 1546 SourceRange getSourceRange() const { 1547 if (isPostfix()) 1548 return SourceRange(Val->getLocStart(), Loc); 1549 else 1550 return SourceRange(Loc, Val->getLocEnd()); 1551 } 1552 SourceLocation getExprLoc() const { return Loc; } 1553 1554 static bool classof(const Stmt *T) { 1555 return T->getStmtClass() == UnaryOperatorClass; 1556 } 1557 static bool classof(const UnaryOperator *) { return true; } 1558 1559 // Iterators 1560 child_range children() { return child_range(&Val, &Val+1); } 1561}; 1562 1563/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1564/// offsetof(record-type, member-designator). For example, given: 1565/// @code 1566/// struct S { 1567/// float f; 1568/// double d; 1569/// }; 1570/// struct T { 1571/// int i; 1572/// struct S s[10]; 1573/// }; 1574/// @endcode 1575/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1576 1577class OffsetOfExpr : public Expr { 1578public: 1579 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1580 class OffsetOfNode { 1581 public: 1582 /// \brief The kind of offsetof node we have. 1583 enum Kind { 1584 /// \brief An index into an array. 1585 Array = 0x00, 1586 /// \brief A field. 1587 Field = 0x01, 1588 /// \brief A field in a dependent type, known only by its name. 1589 Identifier = 0x02, 1590 /// \brief An implicit indirection through a C++ base class, when the 1591 /// field found is in a base class. 1592 Base = 0x03 1593 }; 1594 1595 private: 1596 enum { MaskBits = 2, Mask = 0x03 }; 1597 1598 /// \brief The source range that covers this part of the designator. 1599 SourceRange Range; 1600 1601 /// \brief The data describing the designator, which comes in three 1602 /// different forms, depending on the lower two bits. 1603 /// - An unsigned index into the array of Expr*'s stored after this node 1604 /// in memory, for [constant-expression] designators. 1605 /// - A FieldDecl*, for references to a known field. 1606 /// - An IdentifierInfo*, for references to a field with a given name 1607 /// when the class type is dependent. 1608 /// - A CXXBaseSpecifier*, for references that look at a field in a 1609 /// base class. 1610 uintptr_t Data; 1611 1612 public: 1613 /// \brief Create an offsetof node that refers to an array element. 1614 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1615 SourceLocation RBracketLoc) 1616 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1617 1618 /// \brief Create an offsetof node that refers to a field. 1619 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1620 SourceLocation NameLoc) 1621 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1622 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1623 1624 /// \brief Create an offsetof node that refers to an identifier. 1625 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1626 SourceLocation NameLoc) 1627 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1628 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1629 1630 /// \brief Create an offsetof node that refers into a C++ base class. 1631 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1632 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1633 1634 /// \brief Determine what kind of offsetof node this is. 1635 Kind getKind() const { 1636 return static_cast<Kind>(Data & Mask); 1637 } 1638 1639 /// \brief For an array element node, returns the index into the array 1640 /// of expressions. 1641 unsigned getArrayExprIndex() const { 1642 assert(getKind() == Array); 1643 return Data >> 2; 1644 } 1645 1646 /// \brief For a field offsetof node, returns the field. 1647 FieldDecl *getField() const { 1648 assert(getKind() == Field); 1649 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1650 } 1651 1652 /// \brief For a field or identifier offsetof node, returns the name of 1653 /// the field. 1654 IdentifierInfo *getFieldName() const; 1655 1656 /// \brief For a base class node, returns the base specifier. 1657 CXXBaseSpecifier *getBase() const { 1658 assert(getKind() == Base); 1659 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1660 } 1661 1662 /// \brief Retrieve the source range that covers this offsetof node. 1663 /// 1664 /// For an array element node, the source range contains the locations of 1665 /// the square brackets. For a field or identifier node, the source range 1666 /// contains the location of the period (if there is one) and the 1667 /// identifier. 1668 SourceRange getSourceRange() const { return Range; } 1669 }; 1670 1671private: 1672 1673 SourceLocation OperatorLoc, RParenLoc; 1674 // Base type; 1675 TypeSourceInfo *TSInfo; 1676 // Number of sub-components (i.e. instances of OffsetOfNode). 1677 unsigned NumComps; 1678 // Number of sub-expressions (i.e. array subscript expressions). 1679 unsigned NumExprs; 1680 1681 OffsetOfExpr(ASTContext &C, QualType type, 1682 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1683 OffsetOfNode* compsPtr, unsigned numComps, 1684 Expr** exprsPtr, unsigned numExprs, 1685 SourceLocation RParenLoc); 1686 1687 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1688 : Expr(OffsetOfExprClass, EmptyShell()), 1689 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1690 1691public: 1692 1693 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1694 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1695 OffsetOfNode* compsPtr, unsigned numComps, 1696 Expr** exprsPtr, unsigned numExprs, 1697 SourceLocation RParenLoc); 1698 1699 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1700 unsigned NumComps, unsigned NumExprs); 1701 1702 /// getOperatorLoc - Return the location of the operator. 1703 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1704 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1705 1706 /// \brief Return the location of the right parentheses. 1707 SourceLocation getRParenLoc() const { return RParenLoc; } 1708 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1709 1710 TypeSourceInfo *getTypeSourceInfo() const { 1711 return TSInfo; 1712 } 1713 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1714 TSInfo = tsi; 1715 } 1716 1717 const OffsetOfNode &getComponent(unsigned Idx) const { 1718 assert(Idx < NumComps && "Subscript out of range"); 1719 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1720 } 1721 1722 void setComponent(unsigned Idx, OffsetOfNode ON) { 1723 assert(Idx < NumComps && "Subscript out of range"); 1724 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1725 } 1726 1727 unsigned getNumComponents() const { 1728 return NumComps; 1729 } 1730 1731 Expr* getIndexExpr(unsigned Idx) { 1732 assert(Idx < NumExprs && "Subscript out of range"); 1733 return reinterpret_cast<Expr **>( 1734 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1735 } 1736 const Expr *getIndexExpr(unsigned Idx) const { 1737 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1738 } 1739 1740 void setIndexExpr(unsigned Idx, Expr* E) { 1741 assert(Idx < NumComps && "Subscript out of range"); 1742 reinterpret_cast<Expr **>( 1743 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1744 } 1745 1746 unsigned getNumExpressions() const { 1747 return NumExprs; 1748 } 1749 1750 SourceRange getSourceRange() const { 1751 return SourceRange(OperatorLoc, RParenLoc); 1752 } 1753 1754 static bool classof(const Stmt *T) { 1755 return T->getStmtClass() == OffsetOfExprClass; 1756 } 1757 1758 static bool classof(const OffsetOfExpr *) { return true; } 1759 1760 // Iterators 1761 child_range children() { 1762 Stmt **begin = 1763 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1764 + NumComps); 1765 return child_range(begin, begin + NumExprs); 1766 } 1767}; 1768 1769/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1770/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1771/// vec_step (OpenCL 1.1 6.11.12). 1772class UnaryExprOrTypeTraitExpr : public Expr { 1773 unsigned Kind : 2; 1774 bool isType : 1; // true if operand is a type, false if an expression 1775 union { 1776 TypeSourceInfo *Ty; 1777 Stmt *Ex; 1778 } Argument; 1779 SourceLocation OpLoc, RParenLoc; 1780 1781public: 1782 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1783 QualType resultType, SourceLocation op, 1784 SourceLocation rp) : 1785 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1786 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1787 // Value-dependent if the argument is type-dependent. 1788 TInfo->getType()->isDependentType(), 1789 TInfo->getType()->isInstantiationDependentType(), 1790 TInfo->getType()->containsUnexpandedParameterPack()), 1791 Kind(ExprKind), isType(true), OpLoc(op), RParenLoc(rp) { 1792 Argument.Ty = TInfo; 1793 } 1794 1795 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1796 QualType resultType, SourceLocation op, 1797 SourceLocation rp) : 1798 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1799 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1800 // Value-dependent if the argument is type-dependent. 1801 E->isTypeDependent(), 1802 E->isInstantiationDependent(), 1803 E->containsUnexpandedParameterPack()), 1804 Kind(ExprKind), isType(false), OpLoc(op), RParenLoc(rp) { 1805 Argument.Ex = E; 1806 } 1807 1808 /// \brief Construct an empty sizeof/alignof expression. 1809 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1810 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1811 1812 UnaryExprOrTypeTrait getKind() const { 1813 return static_cast<UnaryExprOrTypeTrait>(Kind); 1814 } 1815 void setKind(UnaryExprOrTypeTrait K) { Kind = K; } 1816 1817 bool isArgumentType() const { return isType; } 1818 QualType getArgumentType() const { 1819 return getArgumentTypeInfo()->getType(); 1820 } 1821 TypeSourceInfo *getArgumentTypeInfo() const { 1822 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1823 return Argument.Ty; 1824 } 1825 Expr *getArgumentExpr() { 1826 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1827 return static_cast<Expr*>(Argument.Ex); 1828 } 1829 const Expr *getArgumentExpr() const { 1830 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1831 } 1832 1833 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1834 void setArgument(TypeSourceInfo *TInfo) { 1835 Argument.Ty = TInfo; 1836 isType = true; 1837 } 1838 1839 /// Gets the argument type, or the type of the argument expression, whichever 1840 /// is appropriate. 1841 QualType getTypeOfArgument() const { 1842 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1843 } 1844 1845 SourceLocation getOperatorLoc() const { return OpLoc; } 1846 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1847 1848 SourceLocation getRParenLoc() const { return RParenLoc; } 1849 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1850 1851 SourceRange getSourceRange() const { 1852 return SourceRange(OpLoc, RParenLoc); 1853 } 1854 1855 static bool classof(const Stmt *T) { 1856 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1857 } 1858 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1859 1860 // Iterators 1861 child_range children(); 1862}; 1863 1864//===----------------------------------------------------------------------===// 1865// Postfix Operators. 1866//===----------------------------------------------------------------------===// 1867 1868/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1869class ArraySubscriptExpr : public Expr { 1870 enum { LHS, RHS, END_EXPR=2 }; 1871 Stmt* SubExprs[END_EXPR]; 1872 SourceLocation RBracketLoc; 1873public: 1874 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1875 ExprValueKind VK, ExprObjectKind OK, 1876 SourceLocation rbracketloc) 1877 : Expr(ArraySubscriptExprClass, t, VK, OK, 1878 lhs->isTypeDependent() || rhs->isTypeDependent(), 1879 lhs->isValueDependent() || rhs->isValueDependent(), 1880 (lhs->isInstantiationDependent() || 1881 rhs->isInstantiationDependent()), 1882 (lhs->containsUnexpandedParameterPack() || 1883 rhs->containsUnexpandedParameterPack())), 1884 RBracketLoc(rbracketloc) { 1885 SubExprs[LHS] = lhs; 1886 SubExprs[RHS] = rhs; 1887 } 1888 1889 /// \brief Create an empty array subscript expression. 1890 explicit ArraySubscriptExpr(EmptyShell Shell) 1891 : Expr(ArraySubscriptExprClass, Shell) { } 1892 1893 /// An array access can be written A[4] or 4[A] (both are equivalent). 1894 /// - getBase() and getIdx() always present the normalized view: A[4]. 1895 /// In this case getBase() returns "A" and getIdx() returns "4". 1896 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1897 /// 4[A] getLHS() returns "4". 1898 /// Note: Because vector element access is also written A[4] we must 1899 /// predicate the format conversion in getBase and getIdx only on the 1900 /// the type of the RHS, as it is possible for the LHS to be a vector of 1901 /// integer type 1902 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1903 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1904 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1905 1906 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1907 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1908 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1909 1910 Expr *getBase() { 1911 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1912 } 1913 1914 const Expr *getBase() const { 1915 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1916 } 1917 1918 Expr *getIdx() { 1919 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1920 } 1921 1922 const Expr *getIdx() const { 1923 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1924 } 1925 1926 SourceRange getSourceRange() const { 1927 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1928 } 1929 1930 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1931 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1932 1933 SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1934 1935 static bool classof(const Stmt *T) { 1936 return T->getStmtClass() == ArraySubscriptExprClass; 1937 } 1938 static bool classof(const ArraySubscriptExpr *) { return true; } 1939 1940 // Iterators 1941 child_range children() { 1942 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 1943 } 1944}; 1945 1946 1947/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1948/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1949/// while its subclasses may represent alternative syntax that (semantically) 1950/// results in a function call. For example, CXXOperatorCallExpr is 1951/// a subclass for overloaded operator calls that use operator syntax, e.g., 1952/// "str1 + str2" to resolve to a function call. 1953class CallExpr : public Expr { 1954 enum { FN=0, PREARGS_START=1 }; 1955 Stmt **SubExprs; 1956 unsigned NumArgs; 1957 SourceLocation RParenLoc; 1958 1959protected: 1960 // These versions of the constructor are for derived classes. 1961 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 1962 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 1963 SourceLocation rparenloc); 1964 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 1965 1966 Stmt *getPreArg(unsigned i) { 1967 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1968 return SubExprs[PREARGS_START+i]; 1969 } 1970 const Stmt *getPreArg(unsigned i) const { 1971 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1972 return SubExprs[PREARGS_START+i]; 1973 } 1974 void setPreArg(unsigned i, Stmt *PreArg) { 1975 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1976 SubExprs[PREARGS_START+i] = PreArg; 1977 } 1978 1979 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 1980 1981public: 1982 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1983 ExprValueKind VK, SourceLocation rparenloc); 1984 1985 /// \brief Build an empty call expression. 1986 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1987 1988 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1989 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1990 void setCallee(Expr *F) { SubExprs[FN] = F; } 1991 1992 Decl *getCalleeDecl(); 1993 const Decl *getCalleeDecl() const { 1994 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1995 } 1996 1997 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1998 FunctionDecl *getDirectCallee(); 1999 const FunctionDecl *getDirectCallee() const { 2000 return const_cast<CallExpr*>(this)->getDirectCallee(); 2001 } 2002 2003 /// getNumArgs - Return the number of actual arguments to this call. 2004 /// 2005 unsigned getNumArgs() const { return NumArgs; } 2006 2007 /// \brief Retrieve the call arguments. 2008 Expr **getArgs() { 2009 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2010 } 2011 const Expr *const *getArgs() const { 2012 return const_cast<CallExpr*>(this)->getArgs(); 2013 } 2014 2015 /// getArg - Return the specified argument. 2016 Expr *getArg(unsigned Arg) { 2017 assert(Arg < NumArgs && "Arg access out of range!"); 2018 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2019 } 2020 const Expr *getArg(unsigned Arg) const { 2021 assert(Arg < NumArgs && "Arg access out of range!"); 2022 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2023 } 2024 2025 /// setArg - Set the specified argument. 2026 void setArg(unsigned Arg, Expr *ArgExpr) { 2027 assert(Arg < NumArgs && "Arg access out of range!"); 2028 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2029 } 2030 2031 /// setNumArgs - This changes the number of arguments present in this call. 2032 /// Any orphaned expressions are deleted by this, and any new operands are set 2033 /// to null. 2034 void setNumArgs(ASTContext& C, unsigned NumArgs); 2035 2036 typedef ExprIterator arg_iterator; 2037 typedef ConstExprIterator const_arg_iterator; 2038 2039 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2040 arg_iterator arg_end() { 2041 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2042 } 2043 const_arg_iterator arg_begin() const { 2044 return SubExprs+PREARGS_START+getNumPreArgs(); 2045 } 2046 const_arg_iterator arg_end() const { 2047 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2048 } 2049 2050 /// getNumCommas - Return the number of commas that must have been present in 2051 /// this function call. 2052 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2053 2054 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2055 /// not, return 0. 2056 unsigned isBuiltinCall(const ASTContext &Context) const; 2057 2058 /// getCallReturnType - Get the return type of the call expr. This is not 2059 /// always the type of the expr itself, if the return type is a reference 2060 /// type. 2061 QualType getCallReturnType() const; 2062 2063 SourceLocation getRParenLoc() const { return RParenLoc; } 2064 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2065 2066 SourceRange getSourceRange() const; 2067 2068 static bool classof(const Stmt *T) { 2069 return T->getStmtClass() >= firstCallExprConstant && 2070 T->getStmtClass() <= lastCallExprConstant; 2071 } 2072 static bool classof(const CallExpr *) { return true; } 2073 2074 // Iterators 2075 child_range children() { 2076 return child_range(&SubExprs[0], 2077 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2078 } 2079}; 2080 2081/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2082/// 2083class MemberExpr : public Expr { 2084 /// Extra data stored in some member expressions. 2085 struct MemberNameQualifier { 2086 /// \brief The nested-name-specifier that qualifies the name, including 2087 /// source-location information. 2088 NestedNameSpecifierLoc QualifierLoc; 2089 2090 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2091 /// name qualifiers. 2092 DeclAccessPair FoundDecl; 2093 }; 2094 2095 /// Base - the expression for the base pointer or structure references. In 2096 /// X.F, this is "X". 2097 Stmt *Base; 2098 2099 /// MemberDecl - This is the decl being referenced by the field/member name. 2100 /// In X.F, this is the decl referenced by F. 2101 ValueDecl *MemberDecl; 2102 2103 /// MemberLoc - This is the location of the member name. 2104 SourceLocation MemberLoc; 2105 2106 /// MemberDNLoc - Provides source/type location info for the 2107 /// declaration name embedded in MemberDecl. 2108 DeclarationNameLoc MemberDNLoc; 2109 2110 /// IsArrow - True if this is "X->F", false if this is "X.F". 2111 bool IsArrow : 1; 2112 2113 /// \brief True if this member expression used a nested-name-specifier to 2114 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2115 /// declaration. When true, a MemberNameQualifier 2116 /// structure is allocated immediately after the MemberExpr. 2117 bool HasQualifierOrFoundDecl : 1; 2118 2119 /// \brief True if this member expression specified a template argument list 2120 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 2121 /// structure (and its TemplateArguments) are allocated immediately after 2122 /// the MemberExpr or, if the member expression also has a qualifier, after 2123 /// the MemberNameQualifier structure. 2124 bool HasExplicitTemplateArgumentList : 1; 2125 2126 /// \brief True if this member expression refers to a method that 2127 /// was resolved from an overloaded set having size greater than 1. 2128 bool HadMultipleCandidates : 1; 2129 2130 /// \brief Retrieve the qualifier that preceded the member name, if any. 2131 MemberNameQualifier *getMemberQualifier() { 2132 assert(HasQualifierOrFoundDecl); 2133 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2134 } 2135 2136 /// \brief Retrieve the qualifier that preceded the member name, if any. 2137 const MemberNameQualifier *getMemberQualifier() const { 2138 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2139 } 2140 2141public: 2142 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2143 const DeclarationNameInfo &NameInfo, QualType ty, 2144 ExprValueKind VK, ExprObjectKind OK) 2145 : Expr(MemberExprClass, ty, VK, OK, 2146 base->isTypeDependent(), 2147 base->isValueDependent(), 2148 base->isInstantiationDependent(), 2149 base->containsUnexpandedParameterPack()), 2150 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 2151 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 2152 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false), 2153 HadMultipleCandidates(false) { 2154 assert(memberdecl->getDeclName() == NameInfo.getName()); 2155 } 2156 2157 // NOTE: this constructor should be used only when it is known that 2158 // the member name can not provide additional syntactic info 2159 // (i.e., source locations for C++ operator names or type source info 2160 // for constructors, destructors and conversion oeprators). 2161 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2162 SourceLocation l, QualType ty, 2163 ExprValueKind VK, ExprObjectKind OK) 2164 : Expr(MemberExprClass, ty, VK, OK, 2165 base->isTypeDependent(), base->isValueDependent(), 2166 base->isInstantiationDependent(), 2167 base->containsUnexpandedParameterPack()), 2168 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 2169 IsArrow(isarrow), 2170 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false), 2171 HadMultipleCandidates(false) {} 2172 2173 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2174 NestedNameSpecifierLoc QualifierLoc, 2175 ValueDecl *memberdecl, DeclAccessPair founddecl, 2176 DeclarationNameInfo MemberNameInfo, 2177 const TemplateArgumentListInfo *targs, 2178 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2179 2180 void setBase(Expr *E) { Base = E; } 2181 Expr *getBase() const { return cast<Expr>(Base); } 2182 2183 /// \brief Retrieve the member declaration to which this expression refers. 2184 /// 2185 /// The returned declaration will either be a FieldDecl or (in C++) 2186 /// a CXXMethodDecl. 2187 ValueDecl *getMemberDecl() const { return MemberDecl; } 2188 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2189 2190 /// \brief Retrieves the declaration found by lookup. 2191 DeclAccessPair getFoundDecl() const { 2192 if (!HasQualifierOrFoundDecl) 2193 return DeclAccessPair::make(getMemberDecl(), 2194 getMemberDecl()->getAccess()); 2195 return getMemberQualifier()->FoundDecl; 2196 } 2197 2198 /// \brief Determines whether this member expression actually had 2199 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2200 /// x->Base::foo. 2201 bool hasQualifier() const { return getQualifier() != 0; } 2202 2203 /// \brief If the member name was qualified, retrieves the 2204 /// nested-name-specifier that precedes the member name. Otherwise, returns 2205 /// NULL. 2206 NestedNameSpecifier *getQualifier() const { 2207 if (!HasQualifierOrFoundDecl) 2208 return 0; 2209 2210 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2211 } 2212 2213 /// \brief If the member name was qualified, retrieves the 2214 /// nested-name-specifier that precedes the member name, with source-location 2215 /// information. 2216 NestedNameSpecifierLoc getQualifierLoc() const { 2217 if (!hasQualifier()) 2218 return NestedNameSpecifierLoc(); 2219 2220 return getMemberQualifier()->QualifierLoc; 2221 } 2222 2223 /// \brief Determines whether this member expression actually had a C++ 2224 /// template argument list explicitly specified, e.g., x.f<int>. 2225 bool hasExplicitTemplateArgs() const { 2226 return HasExplicitTemplateArgumentList; 2227 } 2228 2229 /// \brief Copies the template arguments (if present) into the given 2230 /// structure. 2231 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2232 if (hasExplicitTemplateArgs()) 2233 getExplicitTemplateArgs().copyInto(List); 2234 } 2235 2236 /// \brief Retrieve the explicit template argument list that 2237 /// follow the member template name. This must only be called on an 2238 /// expression with explicit template arguments. 2239 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2240 assert(HasExplicitTemplateArgumentList); 2241 if (!HasQualifierOrFoundDecl) 2242 return *reinterpret_cast<ASTTemplateArgumentListInfo *>(this + 1); 2243 2244 return *reinterpret_cast<ASTTemplateArgumentListInfo *>( 2245 getMemberQualifier() + 1); 2246 } 2247 2248 /// \brief Retrieve the explicit template argument list that 2249 /// followed the member template name. This must only be called on 2250 /// an expression with explicit template arguments. 2251 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2252 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2253 } 2254 2255 /// \brief Retrieves the optional explicit template arguments. 2256 /// This points to the same data as getExplicitTemplateArgs(), but 2257 /// returns null if there are no explicit template arguments. 2258 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2259 if (!hasExplicitTemplateArgs()) return 0; 2260 return &getExplicitTemplateArgs(); 2261 } 2262 2263 /// \brief Retrieve the location of the left angle bracket following the 2264 /// member name ('<'), if any. 2265 SourceLocation getLAngleLoc() const { 2266 if (!HasExplicitTemplateArgumentList) 2267 return SourceLocation(); 2268 2269 return getExplicitTemplateArgs().LAngleLoc; 2270 } 2271 2272 /// \brief Retrieve the template arguments provided as part of this 2273 /// template-id. 2274 const TemplateArgumentLoc *getTemplateArgs() const { 2275 if (!HasExplicitTemplateArgumentList) 2276 return 0; 2277 2278 return getExplicitTemplateArgs().getTemplateArgs(); 2279 } 2280 2281 /// \brief Retrieve the number of template arguments provided as part of this 2282 /// template-id. 2283 unsigned getNumTemplateArgs() const { 2284 if (!HasExplicitTemplateArgumentList) 2285 return 0; 2286 2287 return getExplicitTemplateArgs().NumTemplateArgs; 2288 } 2289 2290 /// \brief Retrieve the location of the right angle bracket following the 2291 /// template arguments ('>'). 2292 SourceLocation getRAngleLoc() const { 2293 if (!HasExplicitTemplateArgumentList) 2294 return SourceLocation(); 2295 2296 return getExplicitTemplateArgs().RAngleLoc; 2297 } 2298 2299 /// \brief Retrieve the member declaration name info. 2300 DeclarationNameInfo getMemberNameInfo() const { 2301 return DeclarationNameInfo(MemberDecl->getDeclName(), 2302 MemberLoc, MemberDNLoc); 2303 } 2304 2305 bool isArrow() const { return IsArrow; } 2306 void setArrow(bool A) { IsArrow = A; } 2307 2308 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2309 /// location of 'F'. 2310 SourceLocation getMemberLoc() const { return MemberLoc; } 2311 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2312 2313 SourceRange getSourceRange() const; 2314 2315 SourceLocation getExprLoc() const { return MemberLoc; } 2316 2317 /// \brief Determine whether the base of this explicit is implicit. 2318 bool isImplicitAccess() const { 2319 return getBase() && getBase()->isImplicitCXXThis(); 2320 } 2321 2322 /// \brief Returns true if this member expression refers to a method that 2323 /// was resolved from an overloaded set having size greater than 1. 2324 bool hadMultipleCandidates() const { 2325 return HadMultipleCandidates; 2326 } 2327 /// \brief Sets the flag telling whether this expression refers to 2328 /// a method that was resolved from an overloaded set having size 2329 /// greater than 1. 2330 void setHadMultipleCandidates(bool V = true) { 2331 HadMultipleCandidates = V; 2332 } 2333 2334 static bool classof(const Stmt *T) { 2335 return T->getStmtClass() == MemberExprClass; 2336 } 2337 static bool classof(const MemberExpr *) { return true; } 2338 2339 // Iterators 2340 child_range children() { return child_range(&Base, &Base+1); } 2341 2342 friend class ASTReader; 2343 friend class ASTStmtWriter; 2344}; 2345 2346/// CompoundLiteralExpr - [C99 6.5.2.5] 2347/// 2348class CompoundLiteralExpr : public Expr { 2349 /// LParenLoc - If non-null, this is the location of the left paren in a 2350 /// compound literal like "(int){4}". This can be null if this is a 2351 /// synthesized compound expression. 2352 SourceLocation LParenLoc; 2353 2354 /// The type as written. This can be an incomplete array type, in 2355 /// which case the actual expression type will be different. 2356 TypeSourceInfo *TInfo; 2357 Stmt *Init; 2358 bool FileScope; 2359public: 2360 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2361 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2362 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2363 tinfo->getType()->isDependentType(), 2364 init->isValueDependent(), 2365 (init->isInstantiationDependent() || 2366 tinfo->getType()->isInstantiationDependentType()), 2367 init->containsUnexpandedParameterPack()), 2368 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2369 2370 /// \brief Construct an empty compound literal. 2371 explicit CompoundLiteralExpr(EmptyShell Empty) 2372 : Expr(CompoundLiteralExprClass, Empty) { } 2373 2374 const Expr *getInitializer() const { return cast<Expr>(Init); } 2375 Expr *getInitializer() { return cast<Expr>(Init); } 2376 void setInitializer(Expr *E) { Init = E; } 2377 2378 bool isFileScope() const { return FileScope; } 2379 void setFileScope(bool FS) { FileScope = FS; } 2380 2381 SourceLocation getLParenLoc() const { return LParenLoc; } 2382 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2383 2384 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2385 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2386 2387 SourceRange getSourceRange() const { 2388 // FIXME: Init should never be null. 2389 if (!Init) 2390 return SourceRange(); 2391 if (LParenLoc.isInvalid()) 2392 return Init->getSourceRange(); 2393 return SourceRange(LParenLoc, Init->getLocEnd()); 2394 } 2395 2396 static bool classof(const Stmt *T) { 2397 return T->getStmtClass() == CompoundLiteralExprClass; 2398 } 2399 static bool classof(const CompoundLiteralExpr *) { return true; } 2400 2401 // Iterators 2402 child_range children() { return child_range(&Init, &Init+1); } 2403}; 2404 2405/// CastExpr - Base class for type casts, including both implicit 2406/// casts (ImplicitCastExpr) and explicit casts that have some 2407/// representation in the source code (ExplicitCastExpr's derived 2408/// classes). 2409class CastExpr : public Expr { 2410public: 2411 typedef clang::CastKind CastKind; 2412 2413private: 2414 Stmt *Op; 2415 2416 void CheckCastConsistency() const; 2417 2418 const CXXBaseSpecifier * const *path_buffer() const { 2419 return const_cast<CastExpr*>(this)->path_buffer(); 2420 } 2421 CXXBaseSpecifier **path_buffer(); 2422 2423 void setBasePathSize(unsigned basePathSize) { 2424 CastExprBits.BasePathSize = basePathSize; 2425 assert(CastExprBits.BasePathSize == basePathSize && 2426 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2427 } 2428 2429protected: 2430 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2431 const CastKind kind, Expr *op, unsigned BasePathSize) : 2432 Expr(SC, ty, VK, OK_Ordinary, 2433 // Cast expressions are type-dependent if the type is 2434 // dependent (C++ [temp.dep.expr]p3). 2435 ty->isDependentType(), 2436 // Cast expressions are value-dependent if the type is 2437 // dependent or if the subexpression is value-dependent. 2438 ty->isDependentType() || (op && op->isValueDependent()), 2439 (ty->isInstantiationDependentType() || 2440 (op && op->isInstantiationDependent())), 2441 (ty->containsUnexpandedParameterPack() || 2442 op->containsUnexpandedParameterPack())), 2443 Op(op) { 2444 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2445 CastExprBits.Kind = kind; 2446 setBasePathSize(BasePathSize); 2447#ifndef NDEBUG 2448 CheckCastConsistency(); 2449#endif 2450 } 2451 2452 /// \brief Construct an empty cast. 2453 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2454 : Expr(SC, Empty) { 2455 setBasePathSize(BasePathSize); 2456 } 2457 2458public: 2459 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2460 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2461 const char *getCastKindName() const; 2462 2463 Expr *getSubExpr() { return cast<Expr>(Op); } 2464 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2465 void setSubExpr(Expr *E) { Op = E; } 2466 2467 /// \brief Retrieve the cast subexpression as it was written in the source 2468 /// code, looking through any implicit casts or other intermediate nodes 2469 /// introduced by semantic analysis. 2470 Expr *getSubExprAsWritten(); 2471 const Expr *getSubExprAsWritten() const { 2472 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2473 } 2474 2475 typedef CXXBaseSpecifier **path_iterator; 2476 typedef const CXXBaseSpecifier * const *path_const_iterator; 2477 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2478 unsigned path_size() const { return CastExprBits.BasePathSize; } 2479 path_iterator path_begin() { return path_buffer(); } 2480 path_iterator path_end() { return path_buffer() + path_size(); } 2481 path_const_iterator path_begin() const { return path_buffer(); } 2482 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2483 2484 void setCastPath(const CXXCastPath &Path); 2485 2486 static bool classof(const Stmt *T) { 2487 return T->getStmtClass() >= firstCastExprConstant && 2488 T->getStmtClass() <= lastCastExprConstant; 2489 } 2490 static bool classof(const CastExpr *) { return true; } 2491 2492 // Iterators 2493 child_range children() { return child_range(&Op, &Op+1); } 2494}; 2495 2496/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2497/// conversions, which have no direct representation in the original 2498/// source code. For example: converting T[]->T*, void f()->void 2499/// (*f)(), float->double, short->int, etc. 2500/// 2501/// In C, implicit casts always produce rvalues. However, in C++, an 2502/// implicit cast whose result is being bound to a reference will be 2503/// an lvalue or xvalue. For example: 2504/// 2505/// @code 2506/// class Base { }; 2507/// class Derived : public Base { }; 2508/// Derived &&ref(); 2509/// void f(Derived d) { 2510/// Base& b = d; // initializer is an ImplicitCastExpr 2511/// // to an lvalue of type Base 2512/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2513/// // to an xvalue of type Base 2514/// } 2515/// @endcode 2516class ImplicitCastExpr : public CastExpr { 2517private: 2518 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2519 unsigned BasePathLength, ExprValueKind VK) 2520 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2521 } 2522 2523 /// \brief Construct an empty implicit cast. 2524 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2525 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2526 2527public: 2528 enum OnStack_t { OnStack }; 2529 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2530 ExprValueKind VK) 2531 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2532 } 2533 2534 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2535 CastKind Kind, Expr *Operand, 2536 const CXXCastPath *BasePath, 2537 ExprValueKind Cat); 2538 2539 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2540 2541 SourceRange getSourceRange() const { 2542 return getSubExpr()->getSourceRange(); 2543 } 2544 2545 static bool classof(const Stmt *T) { 2546 return T->getStmtClass() == ImplicitCastExprClass; 2547 } 2548 static bool classof(const ImplicitCastExpr *) { return true; } 2549}; 2550 2551inline Expr *Expr::IgnoreImpCasts() { 2552 Expr *e = this; 2553 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2554 e = ice->getSubExpr(); 2555 return e; 2556} 2557 2558/// ExplicitCastExpr - An explicit cast written in the source 2559/// code. 2560/// 2561/// This class is effectively an abstract class, because it provides 2562/// the basic representation of an explicitly-written cast without 2563/// specifying which kind of cast (C cast, functional cast, static 2564/// cast, etc.) was written; specific derived classes represent the 2565/// particular style of cast and its location information. 2566/// 2567/// Unlike implicit casts, explicit cast nodes have two different 2568/// types: the type that was written into the source code, and the 2569/// actual type of the expression as determined by semantic 2570/// analysis. These types may differ slightly. For example, in C++ one 2571/// can cast to a reference type, which indicates that the resulting 2572/// expression will be an lvalue or xvalue. The reference type, however, 2573/// will not be used as the type of the expression. 2574class ExplicitCastExpr : public CastExpr { 2575 /// TInfo - Source type info for the (written) type 2576 /// this expression is casting to. 2577 TypeSourceInfo *TInfo; 2578 2579protected: 2580 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2581 CastKind kind, Expr *op, unsigned PathSize, 2582 TypeSourceInfo *writtenTy) 2583 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2584 2585 /// \brief Construct an empty explicit cast. 2586 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2587 : CastExpr(SC, Shell, PathSize) { } 2588 2589public: 2590 /// getTypeInfoAsWritten - Returns the type source info for the type 2591 /// that this expression is casting to. 2592 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2593 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2594 2595 /// getTypeAsWritten - Returns the type that this expression is 2596 /// casting to, as written in the source code. 2597 QualType getTypeAsWritten() const { return TInfo->getType(); } 2598 2599 static bool classof(const Stmt *T) { 2600 return T->getStmtClass() >= firstExplicitCastExprConstant && 2601 T->getStmtClass() <= lastExplicitCastExprConstant; 2602 } 2603 static bool classof(const ExplicitCastExpr *) { return true; } 2604}; 2605 2606/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2607/// cast in C++ (C++ [expr.cast]), which uses the syntax 2608/// (Type)expr. For example: @c (int)f. 2609class CStyleCastExpr : public ExplicitCastExpr { 2610 SourceLocation LPLoc; // the location of the left paren 2611 SourceLocation RPLoc; // the location of the right paren 2612 2613 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2614 unsigned PathSize, TypeSourceInfo *writtenTy, 2615 SourceLocation l, SourceLocation r) 2616 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2617 writtenTy), LPLoc(l), RPLoc(r) {} 2618 2619 /// \brief Construct an empty C-style explicit cast. 2620 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2621 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2622 2623public: 2624 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2625 ExprValueKind VK, CastKind K, 2626 Expr *Op, const CXXCastPath *BasePath, 2627 TypeSourceInfo *WrittenTy, SourceLocation L, 2628 SourceLocation R); 2629 2630 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2631 2632 SourceLocation getLParenLoc() const { return LPLoc; } 2633 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2634 2635 SourceLocation getRParenLoc() const { return RPLoc; } 2636 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2637 2638 SourceRange getSourceRange() const { 2639 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2640 } 2641 static bool classof(const Stmt *T) { 2642 return T->getStmtClass() == CStyleCastExprClass; 2643 } 2644 static bool classof(const CStyleCastExpr *) { return true; } 2645}; 2646 2647/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2648/// 2649/// This expression node kind describes a builtin binary operation, 2650/// such as "x + y" for integer values "x" and "y". The operands will 2651/// already have been converted to appropriate types (e.g., by 2652/// performing promotions or conversions). 2653/// 2654/// In C++, where operators may be overloaded, a different kind of 2655/// expression node (CXXOperatorCallExpr) is used to express the 2656/// invocation of an overloaded operator with operator syntax. Within 2657/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2658/// used to store an expression "x + y" depends on the subexpressions 2659/// for x and y. If neither x or y is type-dependent, and the "+" 2660/// operator resolves to a built-in operation, BinaryOperator will be 2661/// used to express the computation (x and y may still be 2662/// value-dependent). If either x or y is type-dependent, or if the 2663/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2664/// be used to express the computation. 2665class BinaryOperator : public Expr { 2666public: 2667 typedef BinaryOperatorKind Opcode; 2668 2669private: 2670 unsigned Opc : 6; 2671 SourceLocation OpLoc; 2672 2673 enum { LHS, RHS, END_EXPR }; 2674 Stmt* SubExprs[END_EXPR]; 2675public: 2676 2677 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2678 ExprValueKind VK, ExprObjectKind OK, 2679 SourceLocation opLoc) 2680 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2681 lhs->isTypeDependent() || rhs->isTypeDependent(), 2682 lhs->isValueDependent() || rhs->isValueDependent(), 2683 (lhs->isInstantiationDependent() || 2684 rhs->isInstantiationDependent()), 2685 (lhs->containsUnexpandedParameterPack() || 2686 rhs->containsUnexpandedParameterPack())), 2687 Opc(opc), OpLoc(opLoc) { 2688 SubExprs[LHS] = lhs; 2689 SubExprs[RHS] = rhs; 2690 assert(!isCompoundAssignmentOp() && 2691 "Use ArithAssignBinaryOperator for compound assignments"); 2692 } 2693 2694 /// \brief Construct an empty binary operator. 2695 explicit BinaryOperator(EmptyShell Empty) 2696 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2697 2698 SourceLocation getOperatorLoc() const { return OpLoc; } 2699 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2700 2701 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2702 void setOpcode(Opcode O) { Opc = O; } 2703 2704 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2705 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2706 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2707 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2708 2709 SourceRange getSourceRange() const { 2710 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2711 } 2712 2713 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2714 /// corresponds to, e.g. "<<=". 2715 static const char *getOpcodeStr(Opcode Op); 2716 2717 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2718 2719 /// \brief Retrieve the binary opcode that corresponds to the given 2720 /// overloaded operator. 2721 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2722 2723 /// \brief Retrieve the overloaded operator kind that corresponds to 2724 /// the given binary opcode. 2725 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2726 2727 /// predicates to categorize the respective opcodes. 2728 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2729 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2730 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2731 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2732 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2733 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2734 2735 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2736 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2737 2738 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2739 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2740 2741 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2742 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2743 2744 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2745 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2746 2747 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2748 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2749 2750 static bool isAssignmentOp(Opcode Opc) { 2751 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2752 } 2753 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2754 2755 static bool isCompoundAssignmentOp(Opcode Opc) { 2756 return Opc > BO_Assign && Opc <= BO_OrAssign; 2757 } 2758 bool isCompoundAssignmentOp() const { 2759 return isCompoundAssignmentOp(getOpcode()); 2760 } 2761 2762 static bool isShiftAssignOp(Opcode Opc) { 2763 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2764 } 2765 bool isShiftAssignOp() const { 2766 return isShiftAssignOp(getOpcode()); 2767 } 2768 2769 static bool classof(const Stmt *S) { 2770 return S->getStmtClass() >= firstBinaryOperatorConstant && 2771 S->getStmtClass() <= lastBinaryOperatorConstant; 2772 } 2773 static bool classof(const BinaryOperator *) { return true; } 2774 2775 // Iterators 2776 child_range children() { 2777 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2778 } 2779 2780protected: 2781 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2782 ExprValueKind VK, ExprObjectKind OK, 2783 SourceLocation opLoc, bool dead) 2784 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2785 lhs->isTypeDependent() || rhs->isTypeDependent(), 2786 lhs->isValueDependent() || rhs->isValueDependent(), 2787 (lhs->isInstantiationDependent() || 2788 rhs->isInstantiationDependent()), 2789 (lhs->containsUnexpandedParameterPack() || 2790 rhs->containsUnexpandedParameterPack())), 2791 Opc(opc), OpLoc(opLoc) { 2792 SubExprs[LHS] = lhs; 2793 SubExprs[RHS] = rhs; 2794 } 2795 2796 BinaryOperator(StmtClass SC, EmptyShell Empty) 2797 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2798}; 2799 2800/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2801/// track of the type the operation is performed in. Due to the semantics of 2802/// these operators, the operands are promoted, the arithmetic performed, an 2803/// implicit conversion back to the result type done, then the assignment takes 2804/// place. This captures the intermediate type which the computation is done 2805/// in. 2806class CompoundAssignOperator : public BinaryOperator { 2807 QualType ComputationLHSType; 2808 QualType ComputationResultType; 2809public: 2810 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2811 ExprValueKind VK, ExprObjectKind OK, 2812 QualType CompLHSType, QualType CompResultType, 2813 SourceLocation OpLoc) 2814 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2815 ComputationLHSType(CompLHSType), 2816 ComputationResultType(CompResultType) { 2817 assert(isCompoundAssignmentOp() && 2818 "Only should be used for compound assignments"); 2819 } 2820 2821 /// \brief Build an empty compound assignment operator expression. 2822 explicit CompoundAssignOperator(EmptyShell Empty) 2823 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2824 2825 // The two computation types are the type the LHS is converted 2826 // to for the computation and the type of the result; the two are 2827 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2828 QualType getComputationLHSType() const { return ComputationLHSType; } 2829 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2830 2831 QualType getComputationResultType() const { return ComputationResultType; } 2832 void setComputationResultType(QualType T) { ComputationResultType = T; } 2833 2834 static bool classof(const CompoundAssignOperator *) { return true; } 2835 static bool classof(const Stmt *S) { 2836 return S->getStmtClass() == CompoundAssignOperatorClass; 2837 } 2838}; 2839 2840/// AbstractConditionalOperator - An abstract base class for 2841/// ConditionalOperator and BinaryConditionalOperator. 2842class AbstractConditionalOperator : public Expr { 2843 SourceLocation QuestionLoc, ColonLoc; 2844 friend class ASTStmtReader; 2845 2846protected: 2847 AbstractConditionalOperator(StmtClass SC, QualType T, 2848 ExprValueKind VK, ExprObjectKind OK, 2849 bool TD, bool VD, bool ID, 2850 bool ContainsUnexpandedParameterPack, 2851 SourceLocation qloc, 2852 SourceLocation cloc) 2853 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 2854 QuestionLoc(qloc), ColonLoc(cloc) {} 2855 2856 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2857 : Expr(SC, Empty) { } 2858 2859public: 2860 // getCond - Return the expression representing the condition for 2861 // the ?: operator. 2862 Expr *getCond() const; 2863 2864 // getTrueExpr - Return the subexpression representing the value of 2865 // the expression if the condition evaluates to true. 2866 Expr *getTrueExpr() const; 2867 2868 // getFalseExpr - Return the subexpression representing the value of 2869 // the expression if the condition evaluates to false. This is 2870 // the same as getRHS. 2871 Expr *getFalseExpr() const; 2872 2873 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2874 SourceLocation getColonLoc() const { return ColonLoc; } 2875 2876 static bool classof(const Stmt *T) { 2877 return T->getStmtClass() == ConditionalOperatorClass || 2878 T->getStmtClass() == BinaryConditionalOperatorClass; 2879 } 2880 static bool classof(const AbstractConditionalOperator *) { return true; } 2881}; 2882 2883/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2884/// middle" extension is a BinaryConditionalOperator. 2885class ConditionalOperator : public AbstractConditionalOperator { 2886 enum { COND, LHS, RHS, END_EXPR }; 2887 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2888 2889 friend class ASTStmtReader; 2890public: 2891 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2892 SourceLocation CLoc, Expr *rhs, 2893 QualType t, ExprValueKind VK, ExprObjectKind OK) 2894 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 2895 // FIXME: the type of the conditional operator doesn't 2896 // depend on the type of the conditional, but the standard 2897 // seems to imply that it could. File a bug! 2898 (lhs->isTypeDependent() || rhs->isTypeDependent()), 2899 (cond->isValueDependent() || lhs->isValueDependent() || 2900 rhs->isValueDependent()), 2901 (cond->isInstantiationDependent() || 2902 lhs->isInstantiationDependent() || 2903 rhs->isInstantiationDependent()), 2904 (cond->containsUnexpandedParameterPack() || 2905 lhs->containsUnexpandedParameterPack() || 2906 rhs->containsUnexpandedParameterPack()), 2907 QLoc, CLoc) { 2908 SubExprs[COND] = cond; 2909 SubExprs[LHS] = lhs; 2910 SubExprs[RHS] = rhs; 2911 } 2912 2913 /// \brief Build an empty conditional operator. 2914 explicit ConditionalOperator(EmptyShell Empty) 2915 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 2916 2917 // getCond - Return the expression representing the condition for 2918 // the ?: operator. 2919 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2920 2921 // getTrueExpr - Return the subexpression representing the value of 2922 // the expression if the condition evaluates to true. 2923 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 2924 2925 // getFalseExpr - Return the subexpression representing the value of 2926 // the expression if the condition evaluates to false. This is 2927 // the same as getRHS. 2928 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2929 2930 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2931 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2932 2933 SourceRange getSourceRange() const { 2934 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2935 } 2936 static bool classof(const Stmt *T) { 2937 return T->getStmtClass() == ConditionalOperatorClass; 2938 } 2939 static bool classof(const ConditionalOperator *) { return true; } 2940 2941 // Iterators 2942 child_range children() { 2943 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2944 } 2945}; 2946 2947/// BinaryConditionalOperator - The GNU extension to the conditional 2948/// operator which allows the middle operand to be omitted. 2949/// 2950/// This is a different expression kind on the assumption that almost 2951/// every client ends up needing to know that these are different. 2952class BinaryConditionalOperator : public AbstractConditionalOperator { 2953 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 2954 2955 /// - the common condition/left-hand-side expression, which will be 2956 /// evaluated as the opaque value 2957 /// - the condition, expressed in terms of the opaque value 2958 /// - the left-hand-side, expressed in terms of the opaque value 2959 /// - the right-hand-side 2960 Stmt *SubExprs[NUM_SUBEXPRS]; 2961 OpaqueValueExpr *OpaqueValue; 2962 2963 friend class ASTStmtReader; 2964public: 2965 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 2966 Expr *cond, Expr *lhs, Expr *rhs, 2967 SourceLocation qloc, SourceLocation cloc, 2968 QualType t, ExprValueKind VK, ExprObjectKind OK) 2969 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 2970 (common->isTypeDependent() || rhs->isTypeDependent()), 2971 (common->isValueDependent() || rhs->isValueDependent()), 2972 (common->isInstantiationDependent() || 2973 rhs->isInstantiationDependent()), 2974 (common->containsUnexpandedParameterPack() || 2975 rhs->containsUnexpandedParameterPack()), 2976 qloc, cloc), 2977 OpaqueValue(opaqueValue) { 2978 SubExprs[COMMON] = common; 2979 SubExprs[COND] = cond; 2980 SubExprs[LHS] = lhs; 2981 SubExprs[RHS] = rhs; 2982 2983 OpaqueValue->setSourceExpr(common); 2984 } 2985 2986 /// \brief Build an empty conditional operator. 2987 explicit BinaryConditionalOperator(EmptyShell Empty) 2988 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 2989 2990 /// \brief getCommon - Return the common expression, written to the 2991 /// left of the condition. The opaque value will be bound to the 2992 /// result of this expression. 2993 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 2994 2995 /// \brief getOpaqueValue - Return the opaque value placeholder. 2996 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 2997 2998 /// \brief getCond - Return the condition expression; this is defined 2999 /// in terms of the opaque value. 3000 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3001 3002 /// \brief getTrueExpr - Return the subexpression which will be 3003 /// evaluated if the condition evaluates to true; this is defined 3004 /// in terms of the opaque value. 3005 Expr *getTrueExpr() const { 3006 return cast<Expr>(SubExprs[LHS]); 3007 } 3008 3009 /// \brief getFalseExpr - Return the subexpression which will be 3010 /// evaluated if the condnition evaluates to false; this is 3011 /// defined in terms of the opaque value. 3012 Expr *getFalseExpr() const { 3013 return cast<Expr>(SubExprs[RHS]); 3014 } 3015 3016 SourceRange getSourceRange() const { 3017 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 3018 } 3019 static bool classof(const Stmt *T) { 3020 return T->getStmtClass() == BinaryConditionalOperatorClass; 3021 } 3022 static bool classof(const BinaryConditionalOperator *) { return true; } 3023 3024 // Iterators 3025 child_range children() { 3026 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3027 } 3028}; 3029 3030inline Expr *AbstractConditionalOperator::getCond() const { 3031 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3032 return co->getCond(); 3033 return cast<BinaryConditionalOperator>(this)->getCond(); 3034} 3035 3036inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3037 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3038 return co->getTrueExpr(); 3039 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3040} 3041 3042inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3043 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3044 return co->getFalseExpr(); 3045 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3046} 3047 3048/// AddrLabelExpr - The GNU address of label extension, representing &&label. 3049class AddrLabelExpr : public Expr { 3050 SourceLocation AmpAmpLoc, LabelLoc; 3051 LabelDecl *Label; 3052public: 3053 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3054 QualType t) 3055 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3056 false), 3057 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3058 3059 /// \brief Build an empty address of a label expression. 3060 explicit AddrLabelExpr(EmptyShell Empty) 3061 : Expr(AddrLabelExprClass, Empty) { } 3062 3063 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3064 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3065 SourceLocation getLabelLoc() const { return LabelLoc; } 3066 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3067 3068 SourceRange getSourceRange() const { 3069 return SourceRange(AmpAmpLoc, LabelLoc); 3070 } 3071 3072 LabelDecl *getLabel() const { return Label; } 3073 void setLabel(LabelDecl *L) { Label = L; } 3074 3075 static bool classof(const Stmt *T) { 3076 return T->getStmtClass() == AddrLabelExprClass; 3077 } 3078 static bool classof(const AddrLabelExpr *) { return true; } 3079 3080 // Iterators 3081 child_range children() { return child_range(); } 3082}; 3083 3084/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3085/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3086/// takes the value of the last subexpression. 3087/// 3088/// A StmtExpr is always an r-value; values "returned" out of a 3089/// StmtExpr will be copied. 3090class StmtExpr : public Expr { 3091 Stmt *SubStmt; 3092 SourceLocation LParenLoc, RParenLoc; 3093public: 3094 // FIXME: Does type-dependence need to be computed differently? 3095 // FIXME: Do we need to compute instantiation instantiation-dependence for 3096 // statements? (ugh!) 3097 StmtExpr(CompoundStmt *substmt, QualType T, 3098 SourceLocation lp, SourceLocation rp) : 3099 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3100 T->isDependentType(), false, false, false), 3101 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3102 3103 /// \brief Build an empty statement expression. 3104 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3105 3106 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3107 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3108 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3109 3110 SourceRange getSourceRange() const { 3111 return SourceRange(LParenLoc, RParenLoc); 3112 } 3113 3114 SourceLocation getLParenLoc() const { return LParenLoc; } 3115 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3116 SourceLocation getRParenLoc() const { return RParenLoc; } 3117 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3118 3119 static bool classof(const Stmt *T) { 3120 return T->getStmtClass() == StmtExprClass; 3121 } 3122 static bool classof(const StmtExpr *) { return true; } 3123 3124 // Iterators 3125 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3126}; 3127 3128 3129/// ShuffleVectorExpr - clang-specific builtin-in function 3130/// __builtin_shufflevector. 3131/// This AST node represents a operator that does a constant 3132/// shuffle, similar to LLVM's shufflevector instruction. It takes 3133/// two vectors and a variable number of constant indices, 3134/// and returns the appropriately shuffled vector. 3135class ShuffleVectorExpr : public Expr { 3136 SourceLocation BuiltinLoc, RParenLoc; 3137 3138 // SubExprs - the list of values passed to the __builtin_shufflevector 3139 // function. The first two are vectors, and the rest are constant 3140 // indices. The number of values in this list is always 3141 // 2+the number of indices in the vector type. 3142 Stmt **SubExprs; 3143 unsigned NumExprs; 3144 3145public: 3146 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3147 QualType Type, SourceLocation BLoc, 3148 SourceLocation RP); 3149 3150 /// \brief Build an empty vector-shuffle expression. 3151 explicit ShuffleVectorExpr(EmptyShell Empty) 3152 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3153 3154 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3155 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3156 3157 SourceLocation getRParenLoc() const { return RParenLoc; } 3158 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3159 3160 SourceRange getSourceRange() const { 3161 return SourceRange(BuiltinLoc, RParenLoc); 3162 } 3163 static bool classof(const Stmt *T) { 3164 return T->getStmtClass() == ShuffleVectorExprClass; 3165 } 3166 static bool classof(const ShuffleVectorExpr *) { return true; } 3167 3168 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3169 /// constant expression, the actual arguments passed in, and the function 3170 /// pointers. 3171 unsigned getNumSubExprs() const { return NumExprs; } 3172 3173 /// \brief Retrieve the array of expressions. 3174 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3175 3176 /// getExpr - Return the Expr at the specified index. 3177 Expr *getExpr(unsigned Index) { 3178 assert((Index < NumExprs) && "Arg access out of range!"); 3179 return cast<Expr>(SubExprs[Index]); 3180 } 3181 const Expr *getExpr(unsigned Index) const { 3182 assert((Index < NumExprs) && "Arg access out of range!"); 3183 return cast<Expr>(SubExprs[Index]); 3184 } 3185 3186 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3187 3188 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3189 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3190 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3191 } 3192 3193 // Iterators 3194 child_range children() { 3195 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3196 } 3197}; 3198 3199/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3200/// This AST node is similar to the conditional operator (?:) in C, with 3201/// the following exceptions: 3202/// - the test expression must be a integer constant expression. 3203/// - the expression returned acts like the chosen subexpression in every 3204/// visible way: the type is the same as that of the chosen subexpression, 3205/// and all predicates (whether it's an l-value, whether it's an integer 3206/// constant expression, etc.) return the same result as for the chosen 3207/// sub-expression. 3208class ChooseExpr : public Expr { 3209 enum { COND, LHS, RHS, END_EXPR }; 3210 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3211 SourceLocation BuiltinLoc, RParenLoc; 3212public: 3213 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3214 QualType t, ExprValueKind VK, ExprObjectKind OK, 3215 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3216 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3217 (cond->isInstantiationDependent() || 3218 lhs->isInstantiationDependent() || 3219 rhs->isInstantiationDependent()), 3220 (cond->containsUnexpandedParameterPack() || 3221 lhs->containsUnexpandedParameterPack() || 3222 rhs->containsUnexpandedParameterPack())), 3223 BuiltinLoc(BLoc), RParenLoc(RP) { 3224 SubExprs[COND] = cond; 3225 SubExprs[LHS] = lhs; 3226 SubExprs[RHS] = rhs; 3227 } 3228 3229 /// \brief Build an empty __builtin_choose_expr. 3230 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3231 3232 /// isConditionTrue - Return whether the condition is true (i.e. not 3233 /// equal to zero). 3234 bool isConditionTrue(const ASTContext &C) const; 3235 3236 /// getChosenSubExpr - Return the subexpression chosen according to the 3237 /// condition. 3238 Expr *getChosenSubExpr(const ASTContext &C) const { 3239 return isConditionTrue(C) ? getLHS() : getRHS(); 3240 } 3241 3242 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3243 void setCond(Expr *E) { SubExprs[COND] = E; } 3244 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3245 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3246 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3247 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3248 3249 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3250 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3251 3252 SourceLocation getRParenLoc() const { return RParenLoc; } 3253 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3254 3255 SourceRange getSourceRange() const { 3256 return SourceRange(BuiltinLoc, RParenLoc); 3257 } 3258 static bool classof(const Stmt *T) { 3259 return T->getStmtClass() == ChooseExprClass; 3260 } 3261 static bool classof(const ChooseExpr *) { return true; } 3262 3263 // Iterators 3264 child_range children() { 3265 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3266 } 3267}; 3268 3269/// GNUNullExpr - Implements the GNU __null extension, which is a name 3270/// for a null pointer constant that has integral type (e.g., int or 3271/// long) and is the same size and alignment as a pointer. The __null 3272/// extension is typically only used by system headers, which define 3273/// NULL as __null in C++ rather than using 0 (which is an integer 3274/// that may not match the size of a pointer). 3275class GNUNullExpr : public Expr { 3276 /// TokenLoc - The location of the __null keyword. 3277 SourceLocation TokenLoc; 3278 3279public: 3280 GNUNullExpr(QualType Ty, SourceLocation Loc) 3281 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3282 false), 3283 TokenLoc(Loc) { } 3284 3285 /// \brief Build an empty GNU __null expression. 3286 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3287 3288 /// getTokenLocation - The location of the __null token. 3289 SourceLocation getTokenLocation() const { return TokenLoc; } 3290 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3291 3292 SourceRange getSourceRange() const { 3293 return SourceRange(TokenLoc); 3294 } 3295 static bool classof(const Stmt *T) { 3296 return T->getStmtClass() == GNUNullExprClass; 3297 } 3298 static bool classof(const GNUNullExpr *) { return true; } 3299 3300 // Iterators 3301 child_range children() { return child_range(); } 3302}; 3303 3304/// VAArgExpr, used for the builtin function __builtin_va_arg. 3305class VAArgExpr : public Expr { 3306 Stmt *Val; 3307 TypeSourceInfo *TInfo; 3308 SourceLocation BuiltinLoc, RParenLoc; 3309public: 3310 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3311 SourceLocation RPLoc, QualType t) 3312 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3313 t->isDependentType(), false, 3314 (TInfo->getType()->isInstantiationDependentType() || 3315 e->isInstantiationDependent()), 3316 (TInfo->getType()->containsUnexpandedParameterPack() || 3317 e->containsUnexpandedParameterPack())), 3318 Val(e), TInfo(TInfo), 3319 BuiltinLoc(BLoc), 3320 RParenLoc(RPLoc) { } 3321 3322 /// \brief Create an empty __builtin_va_arg expression. 3323 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3324 3325 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3326 Expr *getSubExpr() { return cast<Expr>(Val); } 3327 void setSubExpr(Expr *E) { Val = E; } 3328 3329 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3330 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3331 3332 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3333 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3334 3335 SourceLocation getRParenLoc() const { return RParenLoc; } 3336 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3337 3338 SourceRange getSourceRange() const { 3339 return SourceRange(BuiltinLoc, RParenLoc); 3340 } 3341 static bool classof(const Stmt *T) { 3342 return T->getStmtClass() == VAArgExprClass; 3343 } 3344 static bool classof(const VAArgExpr *) { return true; } 3345 3346 // Iterators 3347 child_range children() { return child_range(&Val, &Val+1); } 3348}; 3349 3350/// @brief Describes an C or C++ initializer list. 3351/// 3352/// InitListExpr describes an initializer list, which can be used to 3353/// initialize objects of different types, including 3354/// struct/class/union types, arrays, and vectors. For example: 3355/// 3356/// @code 3357/// struct foo x = { 1, { 2, 3 } }; 3358/// @endcode 3359/// 3360/// Prior to semantic analysis, an initializer list will represent the 3361/// initializer list as written by the user, but will have the 3362/// placeholder type "void". This initializer list is called the 3363/// syntactic form of the initializer, and may contain C99 designated 3364/// initializers (represented as DesignatedInitExprs), initializations 3365/// of subobject members without explicit braces, and so on. Clients 3366/// interested in the original syntax of the initializer list should 3367/// use the syntactic form of the initializer list. 3368/// 3369/// After semantic analysis, the initializer list will represent the 3370/// semantic form of the initializer, where the initializations of all 3371/// subobjects are made explicit with nested InitListExpr nodes and 3372/// C99 designators have been eliminated by placing the designated 3373/// initializations into the subobject they initialize. Additionally, 3374/// any "holes" in the initialization, where no initializer has been 3375/// specified for a particular subobject, will be replaced with 3376/// implicitly-generated ImplicitValueInitExpr expressions that 3377/// value-initialize the subobjects. Note, however, that the 3378/// initializer lists may still have fewer initializers than there are 3379/// elements to initialize within the object. 3380/// 3381/// Given the semantic form of the initializer list, one can retrieve 3382/// the original syntactic form of that initializer list (if it 3383/// exists) using getSyntacticForm(). Since many initializer lists 3384/// have the same syntactic and semantic forms, getSyntacticForm() may 3385/// return NULL, indicating that the current initializer list also 3386/// serves as its syntactic form. 3387class InitListExpr : public Expr { 3388 // FIXME: Eliminate this vector in favor of ASTContext allocation 3389 typedef ASTVector<Stmt *> InitExprsTy; 3390 InitExprsTy InitExprs; 3391 SourceLocation LBraceLoc, RBraceLoc; 3392 3393 /// Contains the initializer list that describes the syntactic form 3394 /// written in the source code. 3395 InitListExpr *SyntacticForm; 3396 3397 /// \brief Either: 3398 /// If this initializer list initializes an array with more elements than 3399 /// there are initializers in the list, specifies an expression to be used 3400 /// for value initialization of the rest of the elements. 3401 /// Or 3402 /// If this initializer list initializes a union, specifies which 3403 /// field within the union will be initialized. 3404 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3405 3406 /// Whether this initializer list originally had a GNU array-range 3407 /// designator in it. This is a temporary marker used by CodeGen. 3408 bool HadArrayRangeDesignator; 3409 3410public: 3411 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3412 Expr **initexprs, unsigned numinits, 3413 SourceLocation rbraceloc); 3414 3415 /// \brief Build an empty initializer list. 3416 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3417 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3418 3419 unsigned getNumInits() const { return InitExprs.size(); } 3420 3421 /// \brief Retrieve the set of initializers. 3422 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3423 3424 const Expr *getInit(unsigned Init) const { 3425 assert(Init < getNumInits() && "Initializer access out of range!"); 3426 return cast_or_null<Expr>(InitExprs[Init]); 3427 } 3428 3429 Expr *getInit(unsigned Init) { 3430 assert(Init < getNumInits() && "Initializer access out of range!"); 3431 return cast_or_null<Expr>(InitExprs[Init]); 3432 } 3433 3434 void setInit(unsigned Init, Expr *expr) { 3435 assert(Init < getNumInits() && "Initializer access out of range!"); 3436 InitExprs[Init] = expr; 3437 } 3438 3439 /// \brief Reserve space for some number of initializers. 3440 void reserveInits(ASTContext &C, unsigned NumInits); 3441 3442 /// @brief Specify the number of initializers 3443 /// 3444 /// If there are more than @p NumInits initializers, the remaining 3445 /// initializers will be destroyed. If there are fewer than @p 3446 /// NumInits initializers, NULL expressions will be added for the 3447 /// unknown initializers. 3448 void resizeInits(ASTContext &Context, unsigned NumInits); 3449 3450 /// @brief Updates the initializer at index @p Init with the new 3451 /// expression @p expr, and returns the old expression at that 3452 /// location. 3453 /// 3454 /// When @p Init is out of range for this initializer list, the 3455 /// initializer list will be extended with NULL expressions to 3456 /// accommodate the new entry. 3457 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3458 3459 /// \brief If this initializer list initializes an array with more elements 3460 /// than there are initializers in the list, specifies an expression to be 3461 /// used for value initialization of the rest of the elements. 3462 Expr *getArrayFiller() { 3463 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3464 } 3465 const Expr *getArrayFiller() const { 3466 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3467 } 3468 void setArrayFiller(Expr *filler); 3469 3470 /// \brief Return true if this is an array initializer and its array "filler" 3471 /// has been set. 3472 bool hasArrayFiller() const { return getArrayFiller(); } 3473 3474 /// \brief If this initializes a union, specifies which field in the 3475 /// union to initialize. 3476 /// 3477 /// Typically, this field is the first named field within the 3478 /// union. However, a designated initializer can specify the 3479 /// initialization of a different field within the union. 3480 FieldDecl *getInitializedFieldInUnion() { 3481 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3482 } 3483 const FieldDecl *getInitializedFieldInUnion() const { 3484 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3485 } 3486 void setInitializedFieldInUnion(FieldDecl *FD) { 3487 ArrayFillerOrUnionFieldInit = FD; 3488 } 3489 3490 // Explicit InitListExpr's originate from source code (and have valid source 3491 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3492 bool isExplicit() { 3493 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3494 } 3495 3496 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3497 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3498 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3499 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3500 3501 /// @brief Retrieve the initializer list that describes the 3502 /// syntactic form of the initializer. 3503 /// 3504 /// 3505 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3506 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3507 3508 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3509 void sawArrayRangeDesignator(bool ARD = true) { 3510 HadArrayRangeDesignator = ARD; 3511 } 3512 3513 SourceRange getSourceRange() const; 3514 3515 static bool classof(const Stmt *T) { 3516 return T->getStmtClass() == InitListExprClass; 3517 } 3518 static bool classof(const InitListExpr *) { return true; } 3519 3520 // Iterators 3521 child_range children() { 3522 if (InitExprs.empty()) return child_range(); 3523 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3524 } 3525 3526 typedef InitExprsTy::iterator iterator; 3527 typedef InitExprsTy::const_iterator const_iterator; 3528 typedef InitExprsTy::reverse_iterator reverse_iterator; 3529 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3530 3531 iterator begin() { return InitExprs.begin(); } 3532 const_iterator begin() const { return InitExprs.begin(); } 3533 iterator end() { return InitExprs.end(); } 3534 const_iterator end() const { return InitExprs.end(); } 3535 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3536 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3537 reverse_iterator rend() { return InitExprs.rend(); } 3538 const_reverse_iterator rend() const { return InitExprs.rend(); } 3539 3540 friend class ASTStmtReader; 3541 friend class ASTStmtWriter; 3542}; 3543 3544/// @brief Represents a C99 designated initializer expression. 3545/// 3546/// A designated initializer expression (C99 6.7.8) contains one or 3547/// more designators (which can be field designators, array 3548/// designators, or GNU array-range designators) followed by an 3549/// expression that initializes the field or element(s) that the 3550/// designators refer to. For example, given: 3551/// 3552/// @code 3553/// struct point { 3554/// double x; 3555/// double y; 3556/// }; 3557/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3558/// @endcode 3559/// 3560/// The InitListExpr contains three DesignatedInitExprs, the first of 3561/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3562/// designators, one array designator for @c [2] followed by one field 3563/// designator for @c .y. The initalization expression will be 1.0. 3564class DesignatedInitExpr : public Expr { 3565public: 3566 /// \brief Forward declaration of the Designator class. 3567 class Designator; 3568 3569private: 3570 /// The location of the '=' or ':' prior to the actual initializer 3571 /// expression. 3572 SourceLocation EqualOrColonLoc; 3573 3574 /// Whether this designated initializer used the GNU deprecated 3575 /// syntax rather than the C99 '=' syntax. 3576 bool GNUSyntax : 1; 3577 3578 /// The number of designators in this initializer expression. 3579 unsigned NumDesignators : 15; 3580 3581 /// \brief The designators in this designated initialization 3582 /// expression. 3583 Designator *Designators; 3584 3585 /// The number of subexpressions of this initializer expression, 3586 /// which contains both the initializer and any additional 3587 /// expressions used by array and array-range designators. 3588 unsigned NumSubExprs : 16; 3589 3590 3591 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3592 const Designator *Designators, 3593 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3594 Expr **IndexExprs, unsigned NumIndexExprs, 3595 Expr *Init); 3596 3597 explicit DesignatedInitExpr(unsigned NumSubExprs) 3598 : Expr(DesignatedInitExprClass, EmptyShell()), 3599 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3600 3601public: 3602 /// A field designator, e.g., ".x". 3603 struct FieldDesignator { 3604 /// Refers to the field that is being initialized. The low bit 3605 /// of this field determines whether this is actually a pointer 3606 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3607 /// initially constructed, a field designator will store an 3608 /// IdentifierInfo*. After semantic analysis has resolved that 3609 /// name, the field designator will instead store a FieldDecl*. 3610 uintptr_t NameOrField; 3611 3612 /// The location of the '.' in the designated initializer. 3613 unsigned DotLoc; 3614 3615 /// The location of the field name in the designated initializer. 3616 unsigned FieldLoc; 3617 }; 3618 3619 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3620 struct ArrayOrRangeDesignator { 3621 /// Location of the first index expression within the designated 3622 /// initializer expression's list of subexpressions. 3623 unsigned Index; 3624 /// The location of the '[' starting the array range designator. 3625 unsigned LBracketLoc; 3626 /// The location of the ellipsis separating the start and end 3627 /// indices. Only valid for GNU array-range designators. 3628 unsigned EllipsisLoc; 3629 /// The location of the ']' terminating the array range designator. 3630 unsigned RBracketLoc; 3631 }; 3632 3633 /// @brief Represents a single C99 designator. 3634 /// 3635 /// @todo This class is infuriatingly similar to clang::Designator, 3636 /// but minor differences (storing indices vs. storing pointers) 3637 /// keep us from reusing it. Try harder, later, to rectify these 3638 /// differences. 3639 class Designator { 3640 /// @brief The kind of designator this describes. 3641 enum { 3642 FieldDesignator, 3643 ArrayDesignator, 3644 ArrayRangeDesignator 3645 } Kind; 3646 3647 union { 3648 /// A field designator, e.g., ".x". 3649 struct FieldDesignator Field; 3650 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3651 struct ArrayOrRangeDesignator ArrayOrRange; 3652 }; 3653 friend class DesignatedInitExpr; 3654 3655 public: 3656 Designator() {} 3657 3658 /// @brief Initializes a field designator. 3659 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3660 SourceLocation FieldLoc) 3661 : Kind(FieldDesignator) { 3662 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3663 Field.DotLoc = DotLoc.getRawEncoding(); 3664 Field.FieldLoc = FieldLoc.getRawEncoding(); 3665 } 3666 3667 /// @brief Initializes an array designator. 3668 Designator(unsigned Index, SourceLocation LBracketLoc, 3669 SourceLocation RBracketLoc) 3670 : Kind(ArrayDesignator) { 3671 ArrayOrRange.Index = Index; 3672 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3673 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3674 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3675 } 3676 3677 /// @brief Initializes a GNU array-range designator. 3678 Designator(unsigned Index, SourceLocation LBracketLoc, 3679 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3680 : Kind(ArrayRangeDesignator) { 3681 ArrayOrRange.Index = Index; 3682 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3683 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3684 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3685 } 3686 3687 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3688 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3689 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3690 3691 IdentifierInfo *getFieldName() const; 3692 3693 FieldDecl *getField() const { 3694 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3695 if (Field.NameOrField & 0x01) 3696 return 0; 3697 else 3698 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3699 } 3700 3701 void setField(FieldDecl *FD) { 3702 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3703 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3704 } 3705 3706 SourceLocation getDotLoc() const { 3707 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3708 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3709 } 3710 3711 SourceLocation getFieldLoc() const { 3712 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3713 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3714 } 3715 3716 SourceLocation getLBracketLoc() const { 3717 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3718 "Only valid on an array or array-range designator"); 3719 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3720 } 3721 3722 SourceLocation getRBracketLoc() const { 3723 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3724 "Only valid on an array or array-range designator"); 3725 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3726 } 3727 3728 SourceLocation getEllipsisLoc() const { 3729 assert(Kind == ArrayRangeDesignator && 3730 "Only valid on an array-range designator"); 3731 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3732 } 3733 3734 unsigned getFirstExprIndex() const { 3735 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3736 "Only valid on an array or array-range designator"); 3737 return ArrayOrRange.Index; 3738 } 3739 3740 SourceLocation getStartLocation() const { 3741 if (Kind == FieldDesignator) 3742 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3743 else 3744 return getLBracketLoc(); 3745 } 3746 SourceLocation getEndLocation() const { 3747 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3748 } 3749 SourceRange getSourceRange() const { 3750 return SourceRange(getStartLocation(), getEndLocation()); 3751 } 3752 }; 3753 3754 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3755 unsigned NumDesignators, 3756 Expr **IndexExprs, unsigned NumIndexExprs, 3757 SourceLocation EqualOrColonLoc, 3758 bool GNUSyntax, Expr *Init); 3759 3760 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3761 3762 /// @brief Returns the number of designators in this initializer. 3763 unsigned size() const { return NumDesignators; } 3764 3765 // Iterator access to the designators. 3766 typedef Designator *designators_iterator; 3767 designators_iterator designators_begin() { return Designators; } 3768 designators_iterator designators_end() { 3769 return Designators + NumDesignators; 3770 } 3771 3772 typedef const Designator *const_designators_iterator; 3773 const_designators_iterator designators_begin() const { return Designators; } 3774 const_designators_iterator designators_end() const { 3775 return Designators + NumDesignators; 3776 } 3777 3778 typedef std::reverse_iterator<designators_iterator> 3779 reverse_designators_iterator; 3780 reverse_designators_iterator designators_rbegin() { 3781 return reverse_designators_iterator(designators_end()); 3782 } 3783 reverse_designators_iterator designators_rend() { 3784 return reverse_designators_iterator(designators_begin()); 3785 } 3786 3787 typedef std::reverse_iterator<const_designators_iterator> 3788 const_reverse_designators_iterator; 3789 const_reverse_designators_iterator designators_rbegin() const { 3790 return const_reverse_designators_iterator(designators_end()); 3791 } 3792 const_reverse_designators_iterator designators_rend() const { 3793 return const_reverse_designators_iterator(designators_begin()); 3794 } 3795 3796 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3797 3798 void setDesignators(ASTContext &C, const Designator *Desigs, 3799 unsigned NumDesigs); 3800 3801 Expr *getArrayIndex(const Designator& D); 3802 Expr *getArrayRangeStart(const Designator& D); 3803 Expr *getArrayRangeEnd(const Designator& D); 3804 3805 /// @brief Retrieve the location of the '=' that precedes the 3806 /// initializer value itself, if present. 3807 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3808 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3809 3810 /// @brief Determines whether this designated initializer used the 3811 /// deprecated GNU syntax for designated initializers. 3812 bool usesGNUSyntax() const { return GNUSyntax; } 3813 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3814 3815 /// @brief Retrieve the initializer value. 3816 Expr *getInit() const { 3817 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3818 } 3819 3820 void setInit(Expr *init) { 3821 *child_begin() = init; 3822 } 3823 3824 /// \brief Retrieve the total number of subexpressions in this 3825 /// designated initializer expression, including the actual 3826 /// initialized value and any expressions that occur within array 3827 /// and array-range designators. 3828 unsigned getNumSubExprs() const { return NumSubExprs; } 3829 3830 Expr *getSubExpr(unsigned Idx) { 3831 assert(Idx < NumSubExprs && "Subscript out of range"); 3832 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3833 Ptr += sizeof(DesignatedInitExpr); 3834 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3835 } 3836 3837 void setSubExpr(unsigned Idx, Expr *E) { 3838 assert(Idx < NumSubExprs && "Subscript out of range"); 3839 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3840 Ptr += sizeof(DesignatedInitExpr); 3841 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3842 } 3843 3844 /// \brief Replaces the designator at index @p Idx with the series 3845 /// of designators in [First, Last). 3846 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3847 const Designator *Last); 3848 3849 SourceRange getDesignatorsSourceRange() const; 3850 3851 SourceRange getSourceRange() const; 3852 3853 static bool classof(const Stmt *T) { 3854 return T->getStmtClass() == DesignatedInitExprClass; 3855 } 3856 static bool classof(const DesignatedInitExpr *) { return true; } 3857 3858 // Iterators 3859 child_range children() { 3860 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3861 return child_range(begin, begin + NumSubExprs); 3862 } 3863}; 3864 3865/// \brief Represents an implicitly-generated value initialization of 3866/// an object of a given type. 3867/// 3868/// Implicit value initializations occur within semantic initializer 3869/// list expressions (InitListExpr) as placeholders for subobject 3870/// initializations not explicitly specified by the user. 3871/// 3872/// \see InitListExpr 3873class ImplicitValueInitExpr : public Expr { 3874public: 3875 explicit ImplicitValueInitExpr(QualType ty) 3876 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3877 false, false, ty->isInstantiationDependentType(), false) { } 3878 3879 /// \brief Construct an empty implicit value initialization. 3880 explicit ImplicitValueInitExpr(EmptyShell Empty) 3881 : Expr(ImplicitValueInitExprClass, Empty) { } 3882 3883 static bool classof(const Stmt *T) { 3884 return T->getStmtClass() == ImplicitValueInitExprClass; 3885 } 3886 static bool classof(const ImplicitValueInitExpr *) { return true; } 3887 3888 SourceRange getSourceRange() const { 3889 return SourceRange(); 3890 } 3891 3892 // Iterators 3893 child_range children() { return child_range(); } 3894}; 3895 3896 3897class ParenListExpr : public Expr { 3898 Stmt **Exprs; 3899 unsigned NumExprs; 3900 SourceLocation LParenLoc, RParenLoc; 3901 3902public: 3903 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3904 unsigned numexprs, SourceLocation rparenloc, QualType T); 3905 3906 /// \brief Build an empty paren list. 3907 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3908 3909 unsigned getNumExprs() const { return NumExprs; } 3910 3911 const Expr* getExpr(unsigned Init) const { 3912 assert(Init < getNumExprs() && "Initializer access out of range!"); 3913 return cast_or_null<Expr>(Exprs[Init]); 3914 } 3915 3916 Expr* getExpr(unsigned Init) { 3917 assert(Init < getNumExprs() && "Initializer access out of range!"); 3918 return cast_or_null<Expr>(Exprs[Init]); 3919 } 3920 3921 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3922 3923 SourceLocation getLParenLoc() const { return LParenLoc; } 3924 SourceLocation getRParenLoc() const { return RParenLoc; } 3925 3926 SourceRange getSourceRange() const { 3927 return SourceRange(LParenLoc, RParenLoc); 3928 } 3929 static bool classof(const Stmt *T) { 3930 return T->getStmtClass() == ParenListExprClass; 3931 } 3932 static bool classof(const ParenListExpr *) { return true; } 3933 3934 // Iterators 3935 child_range children() { 3936 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 3937 } 3938 3939 friend class ASTStmtReader; 3940 friend class ASTStmtWriter; 3941}; 3942 3943 3944/// \brief Represents a C1X generic selection. 3945/// 3946/// A generic selection (C1X 6.5.1.1) contains an unevaluated controlling 3947/// expression, followed by one or more generic associations. Each generic 3948/// association specifies a type name and an expression, or "default" and an 3949/// expression (in which case it is known as a default generic association). 3950/// The type and value of the generic selection are identical to those of its 3951/// result expression, which is defined as the expression in the generic 3952/// association with a type name that is compatible with the type of the 3953/// controlling expression, or the expression in the default generic association 3954/// if no types are compatible. For example: 3955/// 3956/// @code 3957/// _Generic(X, double: 1, float: 2, default: 3) 3958/// @endcode 3959/// 3960/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 3961/// or 3 if "hello". 3962/// 3963/// As an extension, generic selections are allowed in C++, where the following 3964/// additional semantics apply: 3965/// 3966/// Any generic selection whose controlling expression is type-dependent or 3967/// which names a dependent type in its association list is result-dependent, 3968/// which means that the choice of result expression is dependent. 3969/// Result-dependent generic associations are both type- and value-dependent. 3970class GenericSelectionExpr : public Expr { 3971 enum { CONTROLLING, END_EXPR }; 3972 TypeSourceInfo **AssocTypes; 3973 Stmt **SubExprs; 3974 unsigned NumAssocs, ResultIndex; 3975 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 3976 3977public: 3978 GenericSelectionExpr(ASTContext &Context, 3979 SourceLocation GenericLoc, Expr *ControllingExpr, 3980 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3981 unsigned NumAssocs, SourceLocation DefaultLoc, 3982 SourceLocation RParenLoc, 3983 bool ContainsUnexpandedParameterPack, 3984 unsigned ResultIndex); 3985 3986 /// This constructor is used in the result-dependent case. 3987 GenericSelectionExpr(ASTContext &Context, 3988 SourceLocation GenericLoc, Expr *ControllingExpr, 3989 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3990 unsigned NumAssocs, SourceLocation DefaultLoc, 3991 SourceLocation RParenLoc, 3992 bool ContainsUnexpandedParameterPack); 3993 3994 explicit GenericSelectionExpr(EmptyShell Empty) 3995 : Expr(GenericSelectionExprClass, Empty) { } 3996 3997 unsigned getNumAssocs() const { return NumAssocs; } 3998 3999 SourceLocation getGenericLoc() const { return GenericLoc; } 4000 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4001 SourceLocation getRParenLoc() const { return RParenLoc; } 4002 4003 const Expr *getAssocExpr(unsigned i) const { 4004 return cast<Expr>(SubExprs[END_EXPR+i]); 4005 } 4006 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4007 4008 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4009 return AssocTypes[i]; 4010 } 4011 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4012 4013 QualType getAssocType(unsigned i) const { 4014 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4015 return TS->getType(); 4016 else 4017 return QualType(); 4018 } 4019 4020 const Expr *getControllingExpr() const { 4021 return cast<Expr>(SubExprs[CONTROLLING]); 4022 } 4023 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4024 4025 /// Whether this generic selection is result-dependent. 4026 bool isResultDependent() const { return ResultIndex == -1U; } 4027 4028 /// The zero-based index of the result expression's generic association in 4029 /// the generic selection's association list. Defined only if the 4030 /// generic selection is not result-dependent. 4031 unsigned getResultIndex() const { 4032 assert(!isResultDependent() && "Generic selection is result-dependent"); 4033 return ResultIndex; 4034 } 4035 4036 /// The generic selection's result expression. Defined only if the 4037 /// generic selection is not result-dependent. 4038 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4039 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4040 4041 SourceRange getSourceRange() const { 4042 return SourceRange(GenericLoc, RParenLoc); 4043 } 4044 static bool classof(const Stmt *T) { 4045 return T->getStmtClass() == GenericSelectionExprClass; 4046 } 4047 static bool classof(const GenericSelectionExpr *) { return true; } 4048 4049 child_range children() { 4050 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4051 } 4052 4053 friend class ASTStmtReader; 4054}; 4055 4056//===----------------------------------------------------------------------===// 4057// Clang Extensions 4058//===----------------------------------------------------------------------===// 4059 4060 4061/// ExtVectorElementExpr - This represents access to specific elements of a 4062/// vector, and may occur on the left hand side or right hand side. For example 4063/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4064/// 4065/// Note that the base may have either vector or pointer to vector type, just 4066/// like a struct field reference. 4067/// 4068class ExtVectorElementExpr : public Expr { 4069 Stmt *Base; 4070 IdentifierInfo *Accessor; 4071 SourceLocation AccessorLoc; 4072public: 4073 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4074 IdentifierInfo &accessor, SourceLocation loc) 4075 : Expr(ExtVectorElementExprClass, ty, VK, 4076 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4077 base->isTypeDependent(), base->isValueDependent(), 4078 base->isInstantiationDependent(), 4079 base->containsUnexpandedParameterPack()), 4080 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4081 4082 /// \brief Build an empty vector element expression. 4083 explicit ExtVectorElementExpr(EmptyShell Empty) 4084 : Expr(ExtVectorElementExprClass, Empty) { } 4085 4086 const Expr *getBase() const { return cast<Expr>(Base); } 4087 Expr *getBase() { return cast<Expr>(Base); } 4088 void setBase(Expr *E) { Base = E; } 4089 4090 IdentifierInfo &getAccessor() const { return *Accessor; } 4091 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4092 4093 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4094 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4095 4096 /// getNumElements - Get the number of components being selected. 4097 unsigned getNumElements() const; 4098 4099 /// containsDuplicateElements - Return true if any element access is 4100 /// repeated. 4101 bool containsDuplicateElements() const; 4102 4103 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4104 /// aggregate Constant of ConstantInt(s). 4105 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4106 4107 SourceRange getSourceRange() const { 4108 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4109 } 4110 4111 /// isArrow - Return true if the base expression is a pointer to vector, 4112 /// return false if the base expression is a vector. 4113 bool isArrow() const; 4114 4115 static bool classof(const Stmt *T) { 4116 return T->getStmtClass() == ExtVectorElementExprClass; 4117 } 4118 static bool classof(const ExtVectorElementExpr *) { return true; } 4119 4120 // Iterators 4121 child_range children() { return child_range(&Base, &Base+1); } 4122}; 4123 4124 4125/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4126/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4127class BlockExpr : public Expr { 4128protected: 4129 BlockDecl *TheBlock; 4130public: 4131 BlockExpr(BlockDecl *BD, QualType ty) 4132 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4133 ty->isDependentType(), false, 4134 // FIXME: Check for instantiate-dependence in the statement? 4135 ty->isInstantiationDependentType(), 4136 false), 4137 TheBlock(BD) {} 4138 4139 /// \brief Build an empty block expression. 4140 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4141 4142 const BlockDecl *getBlockDecl() const { return TheBlock; } 4143 BlockDecl *getBlockDecl() { return TheBlock; } 4144 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4145 4146 // Convenience functions for probing the underlying BlockDecl. 4147 SourceLocation getCaretLocation() const; 4148 const Stmt *getBody() const; 4149 Stmt *getBody(); 4150 4151 SourceRange getSourceRange() const { 4152 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4153 } 4154 4155 /// getFunctionType - Return the underlying function type for this block. 4156 const FunctionType *getFunctionType() const; 4157 4158 static bool classof(const Stmt *T) { 4159 return T->getStmtClass() == BlockExprClass; 4160 } 4161 static bool classof(const BlockExpr *) { return true; } 4162 4163 // Iterators 4164 child_range children() { return child_range(); } 4165}; 4166 4167/// BlockDeclRefExpr - A reference to a local variable declared in an 4168/// enclosing scope. 4169class BlockDeclRefExpr : public Expr { 4170 VarDecl *D; 4171 SourceLocation Loc; 4172 bool IsByRef : 1; 4173 bool ConstQualAdded : 1; 4174public: 4175 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 4176 SourceLocation l, bool ByRef, bool constAdded = false); 4177 4178 // \brief Build an empty reference to a declared variable in a 4179 // block. 4180 explicit BlockDeclRefExpr(EmptyShell Empty) 4181 : Expr(BlockDeclRefExprClass, Empty) { } 4182 4183 VarDecl *getDecl() { return D; } 4184 const VarDecl *getDecl() const { return D; } 4185 void setDecl(VarDecl *VD) { D = VD; } 4186 4187 SourceLocation getLocation() const { return Loc; } 4188 void setLocation(SourceLocation L) { Loc = L; } 4189 4190 SourceRange getSourceRange() const { return SourceRange(Loc); } 4191 4192 bool isByRef() const { return IsByRef; } 4193 void setByRef(bool BR) { IsByRef = BR; } 4194 4195 bool isConstQualAdded() const { return ConstQualAdded; } 4196 void setConstQualAdded(bool C) { ConstQualAdded = C; } 4197 4198 static bool classof(const Stmt *T) { 4199 return T->getStmtClass() == BlockDeclRefExprClass; 4200 } 4201 static bool classof(const BlockDeclRefExpr *) { return true; } 4202 4203 // Iterators 4204 child_range children() { return child_range(); } 4205}; 4206 4207/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4208/// This AST node provides support for reinterpreting a type to another 4209/// type of the same size. 4210class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4211private: 4212 Stmt *SrcExpr; 4213 SourceLocation BuiltinLoc, RParenLoc; 4214 4215 friend class ASTReader; 4216 friend class ASTStmtReader; 4217 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4218 4219public: 4220 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4221 ExprValueKind VK, ExprObjectKind OK, 4222 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4223 : Expr(AsTypeExprClass, DstType, VK, OK, 4224 DstType->isDependentType(), 4225 DstType->isDependentType() || SrcExpr->isValueDependent(), 4226 (DstType->isInstantiationDependentType() || 4227 SrcExpr->isInstantiationDependent()), 4228 (DstType->containsUnexpandedParameterPack() || 4229 SrcExpr->containsUnexpandedParameterPack())), 4230 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4231 4232 /// getSrcExpr - Return the Expr to be converted. 4233 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4234 4235 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4236 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4237 4238 /// getRParenLoc - Return the location of final right parenthesis. 4239 SourceLocation getRParenLoc() const { return RParenLoc; } 4240 4241 SourceRange getSourceRange() const { 4242 return SourceRange(BuiltinLoc, RParenLoc); 4243 } 4244 4245 static bool classof(const Stmt *T) { 4246 return T->getStmtClass() == AsTypeExprClass; 4247 } 4248 static bool classof(const AsTypeExpr *) { return true; } 4249 4250 // Iterators 4251 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4252}; 4253 4254/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4255/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4256/// similarly-named C++0x instructions. All of these instructions take one 4257/// primary pointer and at least one memory order. 4258class AtomicExpr : public Expr { 4259public: 4260 enum AtomicOp { Load, Store, CmpXchgStrong, CmpXchgWeak, Xchg, 4261 Add, Sub, And, Or, Xor }; 4262private: 4263 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, END_EXPR }; 4264 Stmt* SubExprs[END_EXPR]; 4265 unsigned NumSubExprs; 4266 SourceLocation BuiltinLoc, RParenLoc; 4267 AtomicOp Op; 4268 4269public: 4270 AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, QualType t, 4271 AtomicOp op, SourceLocation RP); 4272 4273 /// \brief Build an empty AtomicExpr. 4274 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4275 4276 Expr *getPtr() const { 4277 return cast<Expr>(SubExprs[PTR]); 4278 } 4279 void setPtr(Expr *E) { 4280 SubExprs[PTR] = E; 4281 } 4282 Expr *getOrder() const { 4283 return cast<Expr>(SubExprs[ORDER]); 4284 } 4285 void setOrder(Expr *E) { 4286 SubExprs[ORDER] = E; 4287 } 4288 Expr *getVal1() const { 4289 assert(NumSubExprs >= 3); 4290 return cast<Expr>(SubExprs[VAL1]); 4291 } 4292 void setVal1(Expr *E) { 4293 assert(NumSubExprs >= 3); 4294 SubExprs[VAL1] = E; 4295 } 4296 Expr *getOrderFail() const { 4297 assert(NumSubExprs == 5); 4298 return cast<Expr>(SubExprs[ORDER_FAIL]); 4299 } 4300 void setOrderFail(Expr *E) { 4301 assert(NumSubExprs == 5); 4302 SubExprs[ORDER_FAIL] = E; 4303 } 4304 Expr *getVal2() const { 4305 assert(NumSubExprs == 5); 4306 return cast<Expr>(SubExprs[VAL2]); 4307 } 4308 void setVal2(Expr *E) { 4309 assert(NumSubExprs == 5); 4310 SubExprs[VAL2] = E; 4311 } 4312 4313 AtomicOp getOp() const { return Op; } 4314 void setOp(AtomicOp op) { Op = op; } 4315 unsigned getNumSubExprs() { return NumSubExprs; } 4316 void setNumSubExprs(unsigned num) { NumSubExprs = num; } 4317 4318 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4319 4320 bool isVolatile() const { 4321 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4322 } 4323 4324 bool isCmpXChg() const { 4325 return getOp() == AtomicExpr::CmpXchgStrong || 4326 getOp() == AtomicExpr::CmpXchgWeak; 4327 } 4328 4329 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4330 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 4331 4332 SourceLocation getRParenLoc() const { return RParenLoc; } 4333 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 4334 4335 SourceRange getSourceRange() const { 4336 return SourceRange(BuiltinLoc, RParenLoc); 4337 } 4338 static bool classof(const Stmt *T) { 4339 return T->getStmtClass() == AtomicExprClass; 4340 } 4341 static bool classof(const AtomicExpr *) { return true; } 4342 4343 // Iterators 4344 child_range children() { 4345 return child_range(SubExprs, SubExprs+NumSubExprs); 4346 } 4347}; 4348} // end namespace clang 4349 4350#endif 4351