Expr.h revision 8d852e35adb46e0799538dfc9c80d44f27cd3597
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "clang/AST/DeclAccessPair.h" 21#include "clang/AST/OperationKinds.h" 22#include "clang/AST/ASTVector.h" 23#include "clang/AST/TemplateBase.h" 24#include "clang/Basic/TargetInfo.h" 25#include "clang/Basic/TypeTraits.h" 26#include "llvm/ADT/APSInt.h" 27#include "llvm/ADT/APFloat.h" 28#include "llvm/ADT/SmallVector.h" 29#include "llvm/ADT/StringRef.h" 30#include "llvm/Support/Compiler.h" 31#include <cctype> 32 33namespace clang { 34 class ASTContext; 35 class APValue; 36 class Decl; 37 class IdentifierInfo; 38 class ParmVarDecl; 39 class NamedDecl; 40 class ValueDecl; 41 class BlockDecl; 42 class CXXBaseSpecifier; 43 class CXXOperatorCallExpr; 44 class CXXMemberCallExpr; 45 class ObjCPropertyRefExpr; 46 class OpaqueValueExpr; 47 48/// \brief A simple array of base specifiers. 49typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 50 51/// Expr - This represents one expression. Note that Expr's are subclasses of 52/// Stmt. This allows an expression to be transparently used any place a Stmt 53/// is required. 54/// 55class Expr : public Stmt { 56 QualType TR; 57 58protected: 59 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 60 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 61 : Stmt(SC) 62 { 63 ExprBits.TypeDependent = TD; 64 ExprBits.ValueDependent = VD; 65 ExprBits.InstantiationDependent = ID; 66 ExprBits.ValueKind = VK; 67 ExprBits.ObjectKind = OK; 68 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 69 setType(T); 70 } 71 72 /// \brief Construct an empty expression. 73 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 74 75public: 76 QualType getType() const { return TR; } 77 void setType(QualType t) { 78 // In C++, the type of an expression is always adjusted so that it 79 // will not have reference type an expression will never have 80 // reference type (C++ [expr]p6). Use 81 // QualType::getNonReferenceType() to retrieve the non-reference 82 // type. Additionally, inspect Expr::isLvalue to determine whether 83 // an expression that is adjusted in this manner should be 84 // considered an lvalue. 85 assert((t.isNull() || !t->isReferenceType()) && 86 "Expressions can't have reference type"); 87 88 TR = t; 89 } 90 91 /// isValueDependent - Determines whether this expression is 92 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 93 /// array bound of "Chars" in the following example is 94 /// value-dependent. 95 /// @code 96 /// template<int Size, char (&Chars)[Size]> struct meta_string; 97 /// @endcode 98 bool isValueDependent() const { return ExprBits.ValueDependent; } 99 100 /// \brief Set whether this expression is value-dependent or not. 101 void setValueDependent(bool VD) { 102 ExprBits.ValueDependent = VD; 103 if (VD) 104 ExprBits.InstantiationDependent = true; 105 } 106 107 /// isTypeDependent - Determines whether this expression is 108 /// type-dependent (C++ [temp.dep.expr]), which means that its type 109 /// could change from one template instantiation to the next. For 110 /// example, the expressions "x" and "x + y" are type-dependent in 111 /// the following code, but "y" is not type-dependent: 112 /// @code 113 /// template<typename T> 114 /// void add(T x, int y) { 115 /// x + y; 116 /// } 117 /// @endcode 118 bool isTypeDependent() const { return ExprBits.TypeDependent; } 119 120 /// \brief Set whether this expression is type-dependent or not. 121 void setTypeDependent(bool TD) { 122 ExprBits.TypeDependent = TD; 123 if (TD) 124 ExprBits.InstantiationDependent = true; 125 } 126 127 /// \brief Whether this expression is instantiation-dependent, meaning that 128 /// it depends in some way on a template parameter, even if neither its type 129 /// nor (constant) value can change due to the template instantiation. 130 /// 131 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 132 /// instantiation-dependent (since it involves a template parameter \c T), but 133 /// is neither type- nor value-dependent, since the type of the inner 134 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 135 /// \c sizeof is known. 136 /// 137 /// \code 138 /// template<typename T> 139 /// void f(T x, T y) { 140 /// sizeof(sizeof(T() + T()); 141 /// } 142 /// \endcode 143 /// 144 bool isInstantiationDependent() const { 145 return ExprBits.InstantiationDependent; 146 } 147 148 /// \brief Set whether this expression is instantiation-dependent or not. 149 void setInstantiationDependent(bool ID) { 150 ExprBits.InstantiationDependent = ID; 151 } 152 153 /// \brief Whether this expression contains an unexpanded parameter 154 /// pack (for C++0x variadic templates). 155 /// 156 /// Given the following function template: 157 /// 158 /// \code 159 /// template<typename F, typename ...Types> 160 /// void forward(const F &f, Types &&...args) { 161 /// f(static_cast<Types&&>(args)...); 162 /// } 163 /// \endcode 164 /// 165 /// The expressions \c args and \c static_cast<Types&&>(args) both 166 /// contain parameter packs. 167 bool containsUnexpandedParameterPack() const { 168 return ExprBits.ContainsUnexpandedParameterPack; 169 } 170 171 /// \brief Set the bit that describes whether this expression 172 /// contains an unexpanded parameter pack. 173 void setContainsUnexpandedParameterPack(bool PP = true) { 174 ExprBits.ContainsUnexpandedParameterPack = PP; 175 } 176 177 /// getExprLoc - Return the preferred location for the arrow when diagnosing 178 /// a problem with a generic expression. 179 SourceLocation getExprLoc() const LLVM_READONLY; 180 181 /// isUnusedResultAWarning - Return true if this immediate expression should 182 /// be warned about if the result is unused. If so, fill in expr, location, 183 /// and ranges with expr to warn on and source locations/ranges appropriate 184 /// for a warning. 185 bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc, 186 SourceRange &R1, SourceRange &R2, 187 ASTContext &Ctx) const; 188 189 /// isLValue - True if this expression is an "l-value" according to 190 /// the rules of the current language. C and C++ give somewhat 191 /// different rules for this concept, but in general, the result of 192 /// an l-value expression identifies a specific object whereas the 193 /// result of an r-value expression is a value detached from any 194 /// specific storage. 195 /// 196 /// C++0x divides the concept of "r-value" into pure r-values 197 /// ("pr-values") and so-called expiring values ("x-values"), which 198 /// identify specific objects that can be safely cannibalized for 199 /// their resources. This is an unfortunate abuse of terminology on 200 /// the part of the C++ committee. In Clang, when we say "r-value", 201 /// we generally mean a pr-value. 202 bool isLValue() const { return getValueKind() == VK_LValue; } 203 bool isRValue() const { return getValueKind() == VK_RValue; } 204 bool isXValue() const { return getValueKind() == VK_XValue; } 205 bool isGLValue() const { return getValueKind() != VK_RValue; } 206 207 enum LValueClassification { 208 LV_Valid, 209 LV_NotObjectType, 210 LV_IncompleteVoidType, 211 LV_DuplicateVectorComponents, 212 LV_InvalidExpression, 213 LV_InvalidMessageExpression, 214 LV_MemberFunction, 215 LV_SubObjCPropertySetting, 216 LV_ClassTemporary, 217 LV_ArrayTemporary 218 }; 219 /// Reasons why an expression might not be an l-value. 220 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 221 222 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 223 /// does not have an incomplete type, does not have a const-qualified type, 224 /// and if it is a structure or union, does not have any member (including, 225 /// recursively, any member or element of all contained aggregates or unions) 226 /// with a const-qualified type. 227 /// 228 /// \param Loc [in,out] - A source location which *may* be filled 229 /// in with the location of the expression making this a 230 /// non-modifiable lvalue, if specified. 231 enum isModifiableLvalueResult { 232 MLV_Valid, 233 MLV_NotObjectType, 234 MLV_IncompleteVoidType, 235 MLV_DuplicateVectorComponents, 236 MLV_InvalidExpression, 237 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 238 MLV_IncompleteType, 239 MLV_ConstQualified, 240 MLV_ArrayType, 241 MLV_ReadonlyProperty, 242 MLV_NoSetterProperty, 243 MLV_MemberFunction, 244 MLV_SubObjCPropertySetting, 245 MLV_InvalidMessageExpression, 246 MLV_ClassTemporary, 247 MLV_ArrayTemporary 248 }; 249 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 250 SourceLocation *Loc = 0) const; 251 252 /// \brief The return type of classify(). Represents the C++0x expression 253 /// taxonomy. 254 class Classification { 255 public: 256 /// \brief The various classification results. Most of these mean prvalue. 257 enum Kinds { 258 CL_LValue, 259 CL_XValue, 260 CL_Function, // Functions cannot be lvalues in C. 261 CL_Void, // Void cannot be an lvalue in C. 262 CL_AddressableVoid, // Void expression whose address can be taken in C. 263 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 264 CL_MemberFunction, // An expression referring to a member function 265 CL_SubObjCPropertySetting, 266 CL_ClassTemporary, // A temporary of class type, or subobject thereof. 267 CL_ArrayTemporary, // A temporary of array type. 268 CL_ObjCMessageRValue, // ObjC message is an rvalue 269 CL_PRValue // A prvalue for any other reason, of any other type 270 }; 271 /// \brief The results of modification testing. 272 enum ModifiableType { 273 CM_Untested, // testModifiable was false. 274 CM_Modifiable, 275 CM_RValue, // Not modifiable because it's an rvalue 276 CM_Function, // Not modifiable because it's a function; C++ only 277 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 278 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 279 CM_ConstQualified, 280 CM_ArrayType, 281 CM_IncompleteType 282 }; 283 284 private: 285 friend class Expr; 286 287 unsigned short Kind; 288 unsigned short Modifiable; 289 290 explicit Classification(Kinds k, ModifiableType m) 291 : Kind(k), Modifiable(m) 292 {} 293 294 public: 295 Classification() {} 296 297 Kinds getKind() const { return static_cast<Kinds>(Kind); } 298 ModifiableType getModifiable() const { 299 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 300 return static_cast<ModifiableType>(Modifiable); 301 } 302 bool isLValue() const { return Kind == CL_LValue; } 303 bool isXValue() const { return Kind == CL_XValue; } 304 bool isGLValue() const { return Kind <= CL_XValue; } 305 bool isPRValue() const { return Kind >= CL_Function; } 306 bool isRValue() const { return Kind >= CL_XValue; } 307 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 308 309 /// \brief Create a simple, modifiably lvalue 310 static Classification makeSimpleLValue() { 311 return Classification(CL_LValue, CM_Modifiable); 312 } 313 314 }; 315 /// \brief Classify - Classify this expression according to the C++0x 316 /// expression taxonomy. 317 /// 318 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 319 /// old lvalue vs rvalue. This function determines the type of expression this 320 /// is. There are three expression types: 321 /// - lvalues are classical lvalues as in C++03. 322 /// - prvalues are equivalent to rvalues in C++03. 323 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 324 /// function returning an rvalue reference. 325 /// lvalues and xvalues are collectively referred to as glvalues, while 326 /// prvalues and xvalues together form rvalues. 327 Classification Classify(ASTContext &Ctx) const { 328 return ClassifyImpl(Ctx, 0); 329 } 330 331 /// \brief ClassifyModifiable - Classify this expression according to the 332 /// C++0x expression taxonomy, and see if it is valid on the left side 333 /// of an assignment. 334 /// 335 /// This function extends classify in that it also tests whether the 336 /// expression is modifiable (C99 6.3.2.1p1). 337 /// \param Loc A source location that might be filled with a relevant location 338 /// if the expression is not modifiable. 339 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 340 return ClassifyImpl(Ctx, &Loc); 341 } 342 343 /// getValueKindForType - Given a formal return or parameter type, 344 /// give its value kind. 345 static ExprValueKind getValueKindForType(QualType T) { 346 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 347 return (isa<LValueReferenceType>(RT) 348 ? VK_LValue 349 : (RT->getPointeeType()->isFunctionType() 350 ? VK_LValue : VK_XValue)); 351 return VK_RValue; 352 } 353 354 /// getValueKind - The value kind that this expression produces. 355 ExprValueKind getValueKind() const { 356 return static_cast<ExprValueKind>(ExprBits.ValueKind); 357 } 358 359 /// getObjectKind - The object kind that this expression produces. 360 /// Object kinds are meaningful only for expressions that yield an 361 /// l-value or x-value. 362 ExprObjectKind getObjectKind() const { 363 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 364 } 365 366 bool isOrdinaryOrBitFieldObject() const { 367 ExprObjectKind OK = getObjectKind(); 368 return (OK == OK_Ordinary || OK == OK_BitField); 369 } 370 371 /// setValueKind - Set the value kind produced by this expression. 372 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 373 374 /// setObjectKind - Set the object kind produced by this expression. 375 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 376 377private: 378 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 379 380public: 381 382 /// \brief If this expression refers to a bit-field, retrieve the 383 /// declaration of that bit-field. 384 FieldDecl *getBitField(); 385 386 const FieldDecl *getBitField() const { 387 return const_cast<Expr*>(this)->getBitField(); 388 } 389 390 /// \brief If this expression is an l-value for an Objective C 391 /// property, find the underlying property reference expression. 392 const ObjCPropertyRefExpr *getObjCProperty() const; 393 394 /// \brief Returns whether this expression refers to a vector element. 395 bool refersToVectorElement() const; 396 397 /// \brief Returns whether this expression has a placeholder type. 398 bool hasPlaceholderType() const { 399 return getType()->isPlaceholderType(); 400 } 401 402 /// \brief Returns whether this expression has a specific placeholder type. 403 bool hasPlaceholderType(BuiltinType::Kind K) const { 404 assert(BuiltinType::isPlaceholderTypeKind(K)); 405 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 406 return BT->getKind() == K; 407 return false; 408 } 409 410 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 411 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 412 /// but also int expressions which are produced by things like comparisons in 413 /// C. 414 bool isKnownToHaveBooleanValue() const; 415 416 /// isIntegerConstantExpr - Return true if this expression is a valid integer 417 /// constant expression, and, if so, return its value in Result. If not a 418 /// valid i-c-e, return false and fill in Loc (if specified) with the location 419 /// of the invalid expression. 420 /// 421 /// Note: This does not perform the implicit conversions required by C++11 422 /// [expr.const]p5. 423 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 424 SourceLocation *Loc = 0, 425 bool isEvaluated = true) const; 426 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const; 427 428 /// isCXX98IntegralConstantExpr - Return true if this expression is an 429 /// integral constant expression in C++98. Can only be used in C++. 430 bool isCXX98IntegralConstantExpr(ASTContext &Ctx) const; 431 432 /// isCXX11ConstantExpr - Return true if this expression is a constant 433 /// expression in C++11. Can only be used in C++. 434 /// 435 /// Note: This does not perform the implicit conversions required by C++11 436 /// [expr.const]p5. 437 bool isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result = 0, 438 SourceLocation *Loc = 0) const; 439 440 /// isPotentialConstantExpr - Return true if this function's definition 441 /// might be usable in a constant expression in C++11, if it were marked 442 /// constexpr. Return false if the function can never produce a constant 443 /// expression, along with diagnostics describing why not. 444 static bool isPotentialConstantExpr(const FunctionDecl *FD, 445 llvm::SmallVectorImpl< 446 PartialDiagnosticAt> &Diags); 447 448 /// isConstantInitializer - Returns true if this expression can be emitted to 449 /// IR as a constant, and thus can be used as a constant initializer in C. 450 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 451 452 /// EvalStatus is a struct with detailed info about an evaluation in progress. 453 struct EvalStatus { 454 /// HasSideEffects - Whether the evaluated expression has side effects. 455 /// For example, (f() && 0) can be folded, but it still has side effects. 456 bool HasSideEffects; 457 458 /// Diag - If this is non-null, it will be filled in with a stack of notes 459 /// indicating why evaluation failed (or why it failed to produce a constant 460 /// expression). 461 /// If the expression is unfoldable, the notes will indicate why it's not 462 /// foldable. If the expression is foldable, but not a constant expression, 463 /// the notes will describes why it isn't a constant expression. If the 464 /// expression *is* a constant expression, no notes will be produced. 465 llvm::SmallVectorImpl<PartialDiagnosticAt> *Diag; 466 467 EvalStatus() : HasSideEffects(false), Diag(0) {} 468 469 // hasSideEffects - Return true if the evaluated expression has 470 // side effects. 471 bool hasSideEffects() const { 472 return HasSideEffects; 473 } 474 }; 475 476 /// EvalResult is a struct with detailed info about an evaluated expression. 477 struct EvalResult : EvalStatus { 478 /// Val - This is the value the expression can be folded to. 479 APValue Val; 480 481 // isGlobalLValue - Return true if the evaluated lvalue expression 482 // is global. 483 bool isGlobalLValue() const; 484 }; 485 486 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 487 /// an rvalue using any crazy technique (that has nothing to do with language 488 /// standards) that we want to, even if the expression has side-effects. If 489 /// this function returns true, it returns the folded constant in Result. If 490 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 491 /// applied. 492 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 493 494 /// EvaluateAsBooleanCondition - Return true if this is a constant 495 /// which we we can fold and convert to a boolean condition using 496 /// any crazy technique that we want to, even if the expression has 497 /// side-effects. 498 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 499 500 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects }; 501 502 /// EvaluateAsInt - Return true if this is a constant which we can fold and 503 /// convert to an integer, using any crazy technique that we want to. 504 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 505 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 506 507 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 508 /// constant folded without side-effects, but discard the result. 509 bool isEvaluatable(const ASTContext &Ctx) const; 510 511 /// HasSideEffects - This routine returns true for all those expressions 512 /// which must be evaluated each time and must not be optimized away 513 /// or evaluated at compile time. Example is a function call, volatile 514 /// variable read. 515 bool HasSideEffects(const ASTContext &Ctx) const; 516 517 /// \brief Determine whether this expression involves a call to any function 518 /// that is not trivial. 519 bool hasNonTrivialCall(ASTContext &Ctx); 520 521 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 522 /// integer. This must be called on an expression that constant folds to an 523 /// integer. 524 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 525 526 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 527 /// lvalue with link time known address, with no side-effects. 528 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 529 530 /// EvaluateAsInitializer - Evaluate an expression as if it were the 531 /// initializer of the given declaration. Returns true if the initializer 532 /// can be folded to a constant, and produces any relevant notes. In C++11, 533 /// notes will be produced if the expression is not a constant expression. 534 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 535 const VarDecl *VD, 536 llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 537 538 /// \brief Enumeration used to describe the kind of Null pointer constant 539 /// returned from \c isNullPointerConstant(). 540 enum NullPointerConstantKind { 541 /// \brief Expression is not a Null pointer constant. 542 NPCK_NotNull = 0, 543 544 /// \brief Expression is a Null pointer constant built from a zero integer. 545 NPCK_ZeroInteger, 546 547 /// \brief Expression is a C++0X nullptr. 548 NPCK_CXX0X_nullptr, 549 550 /// \brief Expression is a GNU-style __null constant. 551 NPCK_GNUNull 552 }; 553 554 /// \brief Enumeration used to describe how \c isNullPointerConstant() 555 /// should cope with value-dependent expressions. 556 enum NullPointerConstantValueDependence { 557 /// \brief Specifies that the expression should never be value-dependent. 558 NPC_NeverValueDependent = 0, 559 560 /// \brief Specifies that a value-dependent expression of integral or 561 /// dependent type should be considered a null pointer constant. 562 NPC_ValueDependentIsNull, 563 564 /// \brief Specifies that a value-dependent expression should be considered 565 /// to never be a null pointer constant. 566 NPC_ValueDependentIsNotNull 567 }; 568 569 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 570 /// a Null pointer constant. The return value can further distinguish the 571 /// kind of NULL pointer constant that was detected. 572 NullPointerConstantKind isNullPointerConstant( 573 ASTContext &Ctx, 574 NullPointerConstantValueDependence NPC) const; 575 576 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 577 /// write barrier. 578 bool isOBJCGCCandidate(ASTContext &Ctx) const; 579 580 /// \brief Returns true if this expression is a bound member function. 581 bool isBoundMemberFunction(ASTContext &Ctx) const; 582 583 /// \brief Given an expression of bound-member type, find the type 584 /// of the member. Returns null if this is an *overloaded* bound 585 /// member expression. 586 static QualType findBoundMemberType(const Expr *expr); 587 588 /// IgnoreImpCasts - Skip past any implicit casts which might 589 /// surround this expression. Only skips ImplicitCastExprs. 590 Expr *IgnoreImpCasts() LLVM_READONLY; 591 592 /// IgnoreImplicit - Skip past any implicit AST nodes which might 593 /// surround this expression. 594 Expr *IgnoreImplicit() LLVM_READONLY { 595 return cast<Expr>(Stmt::IgnoreImplicit()); 596 } 597 598 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 599 /// its subexpression. If that subexpression is also a ParenExpr, 600 /// then this method recursively returns its subexpression, and so forth. 601 /// Otherwise, the method returns the current Expr. 602 Expr *IgnoreParens() LLVM_READONLY; 603 604 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 605 /// or CastExprs, returning their operand. 606 Expr *IgnoreParenCasts() LLVM_READONLY; 607 608 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 609 /// any ParenExpr or ImplicitCastExprs, returning their operand. 610 Expr *IgnoreParenImpCasts() LLVM_READONLY; 611 612 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 613 /// call to a conversion operator, return the argument. 614 Expr *IgnoreConversionOperator() LLVM_READONLY; 615 616 const Expr *IgnoreConversionOperator() const LLVM_READONLY { 617 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 618 } 619 620 const Expr *IgnoreParenImpCasts() const LLVM_READONLY { 621 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 622 } 623 624 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 625 /// CastExprs that represent lvalue casts, returning their operand. 626 Expr *IgnoreParenLValueCasts() LLVM_READONLY; 627 628 const Expr *IgnoreParenLValueCasts() const LLVM_READONLY { 629 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 630 } 631 632 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 633 /// value (including ptr->int casts of the same size). Strip off any 634 /// ParenExpr or CastExprs, returning their operand. 635 Expr *IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY; 636 637 /// \brief Determine whether this expression is a default function argument. 638 /// 639 /// Default arguments are implicitly generated in the abstract syntax tree 640 /// by semantic analysis for function calls, object constructions, etc. in 641 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 642 /// this routine also looks through any implicit casts to determine whether 643 /// the expression is a default argument. 644 bool isDefaultArgument() const; 645 646 /// \brief Determine whether the result of this expression is a 647 /// temporary object of the given class type. 648 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 649 650 /// \brief Whether this expression is an implicit reference to 'this' in C++. 651 bool isImplicitCXXThis() const; 652 653 const Expr *IgnoreImpCasts() const LLVM_READONLY { 654 return const_cast<Expr*>(this)->IgnoreImpCasts(); 655 } 656 const Expr *IgnoreParens() const LLVM_READONLY { 657 return const_cast<Expr*>(this)->IgnoreParens(); 658 } 659 const Expr *IgnoreParenCasts() const LLVM_READONLY { 660 return const_cast<Expr*>(this)->IgnoreParenCasts(); 661 } 662 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const LLVM_READONLY { 663 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 664 } 665 666 static bool hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs); 667 668 /// \brief For an expression of class type or pointer to class type, 669 /// return the most derived class decl the expression is known to refer to. 670 /// 671 /// If this expression is a cast, this method looks through it to find the 672 /// most derived decl that can be inferred from the expression. 673 /// This is valid because derived-to-base conversions have undefined 674 /// behavior if the object isn't dynamically of the derived type. 675 const CXXRecordDecl *getBestDynamicClassType() const; 676 677 static bool classof(const Stmt *T) { 678 return T->getStmtClass() >= firstExprConstant && 679 T->getStmtClass() <= lastExprConstant; 680 } 681 static bool classof(const Expr *) { return true; } 682}; 683 684 685//===----------------------------------------------------------------------===// 686// Primary Expressions. 687//===----------------------------------------------------------------------===// 688 689/// OpaqueValueExpr - An expression referring to an opaque object of a 690/// fixed type and value class. These don't correspond to concrete 691/// syntax; instead they're used to express operations (usually copy 692/// operations) on values whose source is generally obvious from 693/// context. 694class OpaqueValueExpr : public Expr { 695 friend class ASTStmtReader; 696 Expr *SourceExpr; 697 SourceLocation Loc; 698 699public: 700 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 701 ExprObjectKind OK = OK_Ordinary, 702 Expr *SourceExpr = 0) 703 : Expr(OpaqueValueExprClass, T, VK, OK, 704 T->isDependentType(), 705 T->isDependentType() || 706 (SourceExpr && SourceExpr->isValueDependent()), 707 T->isInstantiationDependentType(), 708 false), 709 SourceExpr(SourceExpr), Loc(Loc) { 710 } 711 712 /// Given an expression which invokes a copy constructor --- i.e. a 713 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 714 /// find the OpaqueValueExpr that's the source of the construction. 715 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 716 717 explicit OpaqueValueExpr(EmptyShell Empty) 718 : Expr(OpaqueValueExprClass, Empty) { } 719 720 /// \brief Retrieve the location of this expression. 721 SourceLocation getLocation() const { return Loc; } 722 723 SourceRange getSourceRange() const LLVM_READONLY { 724 if (SourceExpr) return SourceExpr->getSourceRange(); 725 return Loc; 726 } 727 SourceLocation getExprLoc() const LLVM_READONLY { 728 if (SourceExpr) return SourceExpr->getExprLoc(); 729 return Loc; 730 } 731 732 child_range children() { return child_range(); } 733 734 /// The source expression of an opaque value expression is the 735 /// expression which originally generated the value. This is 736 /// provided as a convenience for analyses that don't wish to 737 /// precisely model the execution behavior of the program. 738 /// 739 /// The source expression is typically set when building the 740 /// expression which binds the opaque value expression in the first 741 /// place. 742 Expr *getSourceExpr() const { return SourceExpr; } 743 744 static bool classof(const Stmt *T) { 745 return T->getStmtClass() == OpaqueValueExprClass; 746 } 747 static bool classof(const OpaqueValueExpr *) { return true; } 748}; 749 750/// \brief A reference to a declared variable, function, enum, etc. 751/// [C99 6.5.1p2] 752/// 753/// This encodes all the information about how a declaration is referenced 754/// within an expression. 755/// 756/// There are several optional constructs attached to DeclRefExprs only when 757/// they apply in order to conserve memory. These are laid out past the end of 758/// the object, and flags in the DeclRefExprBitfield track whether they exist: 759/// 760/// DeclRefExprBits.HasQualifier: 761/// Specifies when this declaration reference expression has a C++ 762/// nested-name-specifier. 763/// DeclRefExprBits.HasFoundDecl: 764/// Specifies when this declaration reference expression has a record of 765/// a NamedDecl (different from the referenced ValueDecl) which was found 766/// during name lookup and/or overload resolution. 767/// DeclRefExprBits.HasTemplateKWAndArgsInfo: 768/// Specifies when this declaration reference expression has an explicit 769/// C++ template keyword and/or template argument list. 770/// DeclRefExprBits.RefersToEnclosingLocal 771/// Specifies when this declaration reference expression (validly) 772/// refers to a local variable from a different function. 773class DeclRefExpr : public Expr { 774 /// \brief The declaration that we are referencing. 775 ValueDecl *D; 776 777 /// \brief The location of the declaration name itself. 778 SourceLocation Loc; 779 780 /// \brief Provides source/type location info for the declaration name 781 /// embedded in D. 782 DeclarationNameLoc DNLoc; 783 784 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 785 NestedNameSpecifierLoc &getInternalQualifierLoc() { 786 assert(hasQualifier()); 787 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 788 } 789 790 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 791 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 792 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 793 } 794 795 /// \brief Test whether there is a distinct FoundDecl attached to the end of 796 /// this DRE. 797 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 798 799 /// \brief Helper to retrieve the optional NamedDecl through which this 800 /// reference occured. 801 NamedDecl *&getInternalFoundDecl() { 802 assert(hasFoundDecl()); 803 if (hasQualifier()) 804 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 805 return *reinterpret_cast<NamedDecl **>(this + 1); 806 } 807 808 /// \brief Helper to retrieve the optional NamedDecl through which this 809 /// reference occured. 810 NamedDecl *getInternalFoundDecl() const { 811 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 812 } 813 814 DeclRefExpr(ASTContext &Ctx, 815 NestedNameSpecifierLoc QualifierLoc, 816 SourceLocation TemplateKWLoc, 817 ValueDecl *D, bool refersToEnclosingLocal, 818 const DeclarationNameInfo &NameInfo, 819 NamedDecl *FoundD, 820 const TemplateArgumentListInfo *TemplateArgs, 821 QualType T, ExprValueKind VK); 822 823 /// \brief Construct an empty declaration reference expression. 824 explicit DeclRefExpr(EmptyShell Empty) 825 : Expr(DeclRefExprClass, Empty) { } 826 827 /// \brief Computes the type- and value-dependence flags for this 828 /// declaration reference expression. 829 void computeDependence(ASTContext &C); 830 831public: 832 DeclRefExpr(ValueDecl *D, bool refersToEnclosingLocal, QualType T, 833 ExprValueKind VK, SourceLocation L, 834 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 835 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 836 D(D), Loc(L), DNLoc(LocInfo) { 837 DeclRefExprBits.HasQualifier = 0; 838 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 839 DeclRefExprBits.HasFoundDecl = 0; 840 DeclRefExprBits.HadMultipleCandidates = 0; 841 DeclRefExprBits.RefersToEnclosingLocal = refersToEnclosingLocal; 842 computeDependence(D->getASTContext()); 843 } 844 845 static DeclRefExpr *Create(ASTContext &Context, 846 NestedNameSpecifierLoc QualifierLoc, 847 SourceLocation TemplateKWLoc, 848 ValueDecl *D, 849 bool isEnclosingLocal, 850 SourceLocation NameLoc, 851 QualType T, ExprValueKind VK, 852 NamedDecl *FoundD = 0, 853 const TemplateArgumentListInfo *TemplateArgs = 0); 854 855 static DeclRefExpr *Create(ASTContext &Context, 856 NestedNameSpecifierLoc QualifierLoc, 857 SourceLocation TemplateKWLoc, 858 ValueDecl *D, 859 bool isEnclosingLocal, 860 const DeclarationNameInfo &NameInfo, 861 QualType T, ExprValueKind VK, 862 NamedDecl *FoundD = 0, 863 const TemplateArgumentListInfo *TemplateArgs = 0); 864 865 /// \brief Construct an empty declaration reference expression. 866 static DeclRefExpr *CreateEmpty(ASTContext &Context, 867 bool HasQualifier, 868 bool HasFoundDecl, 869 bool HasTemplateKWAndArgsInfo, 870 unsigned NumTemplateArgs); 871 872 ValueDecl *getDecl() { return D; } 873 const ValueDecl *getDecl() const { return D; } 874 void setDecl(ValueDecl *NewD) { D = NewD; } 875 876 DeclarationNameInfo getNameInfo() const { 877 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 878 } 879 880 SourceLocation getLocation() const { return Loc; } 881 void setLocation(SourceLocation L) { Loc = L; } 882 SourceRange getSourceRange() const LLVM_READONLY; 883 SourceLocation getLocStart() const LLVM_READONLY; 884 SourceLocation getLocEnd() const LLVM_READONLY; 885 886 /// \brief Determine whether this declaration reference was preceded by a 887 /// C++ nested-name-specifier, e.g., \c N::foo. 888 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 889 890 /// \brief If the name was qualified, retrieves the nested-name-specifier 891 /// that precedes the name. Otherwise, returns NULL. 892 NestedNameSpecifier *getQualifier() const { 893 if (!hasQualifier()) 894 return 0; 895 896 return getInternalQualifierLoc().getNestedNameSpecifier(); 897 } 898 899 /// \brief If the name was qualified, retrieves the nested-name-specifier 900 /// that precedes the name, with source-location information. 901 NestedNameSpecifierLoc getQualifierLoc() const { 902 if (!hasQualifier()) 903 return NestedNameSpecifierLoc(); 904 905 return getInternalQualifierLoc(); 906 } 907 908 /// \brief Get the NamedDecl through which this reference occured. 909 /// 910 /// This Decl may be different from the ValueDecl actually referred to in the 911 /// presence of using declarations, etc. It always returns non-NULL, and may 912 /// simple return the ValueDecl when appropriate. 913 NamedDecl *getFoundDecl() { 914 return hasFoundDecl() ? getInternalFoundDecl() : D; 915 } 916 917 /// \brief Get the NamedDecl through which this reference occurred. 918 /// See non-const variant. 919 const NamedDecl *getFoundDecl() const { 920 return hasFoundDecl() ? getInternalFoundDecl() : D; 921 } 922 923 bool hasTemplateKWAndArgsInfo() const { 924 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 925 } 926 927 /// \brief Return the optional template keyword and arguments info. 928 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 929 if (!hasTemplateKWAndArgsInfo()) 930 return 0; 931 932 if (hasFoundDecl()) 933 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 934 &getInternalFoundDecl() + 1); 935 936 if (hasQualifier()) 937 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 938 &getInternalQualifierLoc() + 1); 939 940 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 941 } 942 943 /// \brief Return the optional template keyword and arguments info. 944 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 945 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo(); 946 } 947 948 /// \brief Retrieve the location of the template keyword preceding 949 /// this name, if any. 950 SourceLocation getTemplateKeywordLoc() const { 951 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 952 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 953 } 954 955 /// \brief Retrieve the location of the left angle bracket starting the 956 /// explicit template argument list following the name, if any. 957 SourceLocation getLAngleLoc() const { 958 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 959 return getTemplateKWAndArgsInfo()->LAngleLoc; 960 } 961 962 /// \brief Retrieve the location of the right angle bracket ending the 963 /// explicit template argument list following the name, if any. 964 SourceLocation getRAngleLoc() const { 965 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 966 return getTemplateKWAndArgsInfo()->RAngleLoc; 967 } 968 969 /// \brief Determines whether the name in this declaration reference 970 /// was preceded by the template keyword. 971 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 972 973 /// \brief Determines whether this declaration reference was followed by an 974 /// explicit template argument list. 975 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 976 977 /// \brief Retrieve the explicit template argument list that followed the 978 /// member template name. 979 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 980 assert(hasExplicitTemplateArgs()); 981 return *getTemplateKWAndArgsInfo(); 982 } 983 984 /// \brief Retrieve the explicit template argument list that followed the 985 /// member template name. 986 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 987 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 988 } 989 990 /// \brief Retrieves the optional explicit template arguments. 991 /// This points to the same data as getExplicitTemplateArgs(), but 992 /// returns null if there are no explicit template arguments. 993 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 994 if (!hasExplicitTemplateArgs()) return 0; 995 return &getExplicitTemplateArgs(); 996 } 997 998 /// \brief Copies the template arguments (if present) into the given 999 /// structure. 1000 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1001 if (hasExplicitTemplateArgs()) 1002 getExplicitTemplateArgs().copyInto(List); 1003 } 1004 1005 /// \brief Retrieve the template arguments provided as part of this 1006 /// template-id. 1007 const TemplateArgumentLoc *getTemplateArgs() const { 1008 if (!hasExplicitTemplateArgs()) 1009 return 0; 1010 1011 return getExplicitTemplateArgs().getTemplateArgs(); 1012 } 1013 1014 /// \brief Retrieve the number of template arguments provided as part of this 1015 /// template-id. 1016 unsigned getNumTemplateArgs() const { 1017 if (!hasExplicitTemplateArgs()) 1018 return 0; 1019 1020 return getExplicitTemplateArgs().NumTemplateArgs; 1021 } 1022 1023 /// \brief Returns true if this expression refers to a function that 1024 /// was resolved from an overloaded set having size greater than 1. 1025 bool hadMultipleCandidates() const { 1026 return DeclRefExprBits.HadMultipleCandidates; 1027 } 1028 /// \brief Sets the flag telling whether this expression refers to 1029 /// a function that was resolved from an overloaded set having size 1030 /// greater than 1. 1031 void setHadMultipleCandidates(bool V = true) { 1032 DeclRefExprBits.HadMultipleCandidates = V; 1033 } 1034 1035 /// Does this DeclRefExpr refer to a local declaration from an 1036 /// enclosing function scope? 1037 bool refersToEnclosingLocal() const { 1038 return DeclRefExprBits.RefersToEnclosingLocal; 1039 } 1040 1041 static bool classof(const Stmt *T) { 1042 return T->getStmtClass() == DeclRefExprClass; 1043 } 1044 static bool classof(const DeclRefExpr *) { return true; } 1045 1046 // Iterators 1047 child_range children() { return child_range(); } 1048 1049 friend class ASTStmtReader; 1050 friend class ASTStmtWriter; 1051}; 1052 1053/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 1054class PredefinedExpr : public Expr { 1055public: 1056 enum IdentType { 1057 Func, 1058 Function, 1059 LFunction, // Same as Function, but as wide string. 1060 PrettyFunction, 1061 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 1062 /// 'virtual' keyword is omitted for virtual member functions. 1063 PrettyFunctionNoVirtual 1064 }; 1065 1066private: 1067 SourceLocation Loc; 1068 IdentType Type; 1069public: 1070 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 1071 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 1072 type->isDependentType(), type->isDependentType(), 1073 type->isInstantiationDependentType(), 1074 /*ContainsUnexpandedParameterPack=*/false), 1075 Loc(l), Type(IT) {} 1076 1077 /// \brief Construct an empty predefined expression. 1078 explicit PredefinedExpr(EmptyShell Empty) 1079 : Expr(PredefinedExprClass, Empty) { } 1080 1081 IdentType getIdentType() const { return Type; } 1082 void setIdentType(IdentType IT) { Type = IT; } 1083 1084 SourceLocation getLocation() const { return Loc; } 1085 void setLocation(SourceLocation L) { Loc = L; } 1086 1087 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1088 1089 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1090 1091 static bool classof(const Stmt *T) { 1092 return T->getStmtClass() == PredefinedExprClass; 1093 } 1094 static bool classof(const PredefinedExpr *) { return true; } 1095 1096 // Iterators 1097 child_range children() { return child_range(); } 1098}; 1099 1100/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1101/// leaking memory. 1102/// 1103/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1104/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1105/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1106/// the APFloat/APInt values will never get freed. APNumericStorage uses 1107/// ASTContext's allocator for memory allocation. 1108class APNumericStorage { 1109 union { 1110 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1111 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1112 }; 1113 unsigned BitWidth; 1114 1115 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1116 1117 APNumericStorage(const APNumericStorage&); // do not implement 1118 APNumericStorage& operator=(const APNumericStorage&); // do not implement 1119 1120protected: 1121 APNumericStorage() : VAL(0), BitWidth(0) { } 1122 1123 llvm::APInt getIntValue() const { 1124 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1125 if (NumWords > 1) 1126 return llvm::APInt(BitWidth, NumWords, pVal); 1127 else 1128 return llvm::APInt(BitWidth, VAL); 1129 } 1130 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1131}; 1132 1133class APIntStorage : private APNumericStorage { 1134public: 1135 llvm::APInt getValue() const { return getIntValue(); } 1136 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1137}; 1138 1139class APFloatStorage : private APNumericStorage { 1140public: 1141 llvm::APFloat getValue(bool IsIEEE) const { 1142 return llvm::APFloat(getIntValue(), IsIEEE); 1143 } 1144 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1145 setIntValue(C, Val.bitcastToAPInt()); 1146 } 1147}; 1148 1149class IntegerLiteral : public Expr, public APIntStorage { 1150 SourceLocation Loc; 1151 1152 /// \brief Construct an empty integer literal. 1153 explicit IntegerLiteral(EmptyShell Empty) 1154 : Expr(IntegerLiteralClass, Empty) { } 1155 1156public: 1157 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1158 // or UnsignedLongLongTy 1159 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 1160 QualType type, SourceLocation l) 1161 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1162 false, false), 1163 Loc(l) { 1164 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 1165 assert(V.getBitWidth() == C.getIntWidth(type) && 1166 "Integer type is not the correct size for constant."); 1167 setValue(C, V); 1168 } 1169 1170 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1171 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1172 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1173 /// \param V - the value that the returned integer literal contains. 1174 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1175 QualType type, SourceLocation l); 1176 /// \brief Returns a new empty integer literal. 1177 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1178 1179 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1180 1181 /// \brief Retrieve the location of the literal. 1182 SourceLocation getLocation() const { return Loc; } 1183 1184 void setLocation(SourceLocation Location) { Loc = Location; } 1185 1186 static bool classof(const Stmt *T) { 1187 return T->getStmtClass() == IntegerLiteralClass; 1188 } 1189 static bool classof(const IntegerLiteral *) { return true; } 1190 1191 // Iterators 1192 child_range children() { return child_range(); } 1193}; 1194 1195class CharacterLiteral : public Expr { 1196public: 1197 enum CharacterKind { 1198 Ascii, 1199 Wide, 1200 UTF16, 1201 UTF32 1202 }; 1203 1204private: 1205 unsigned Value; 1206 SourceLocation Loc; 1207public: 1208 // type should be IntTy 1209 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1210 SourceLocation l) 1211 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1212 false, false), 1213 Value(value), Loc(l) { 1214 CharacterLiteralBits.Kind = kind; 1215 } 1216 1217 /// \brief Construct an empty character literal. 1218 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1219 1220 SourceLocation getLocation() const { return Loc; } 1221 CharacterKind getKind() const { 1222 return static_cast<CharacterKind>(CharacterLiteralBits.Kind); 1223 } 1224 1225 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1226 1227 unsigned getValue() const { return Value; } 1228 1229 void setLocation(SourceLocation Location) { Loc = Location; } 1230 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; } 1231 void setValue(unsigned Val) { Value = Val; } 1232 1233 static bool classof(const Stmt *T) { 1234 return T->getStmtClass() == CharacterLiteralClass; 1235 } 1236 static bool classof(const CharacterLiteral *) { return true; } 1237 1238 // Iterators 1239 child_range children() { return child_range(); } 1240}; 1241 1242class FloatingLiteral : public Expr, private APFloatStorage { 1243 SourceLocation Loc; 1244 1245 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1246 QualType Type, SourceLocation L) 1247 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1248 false, false), Loc(L) { 1249 FloatingLiteralBits.IsIEEE = 1250 &C.getTargetInfo().getLongDoubleFormat() == &llvm::APFloat::IEEEquad; 1251 FloatingLiteralBits.IsExact = isexact; 1252 setValue(C, V); 1253 } 1254 1255 /// \brief Construct an empty floating-point literal. 1256 explicit FloatingLiteral(ASTContext &C, EmptyShell Empty) 1257 : Expr(FloatingLiteralClass, Empty) { 1258 FloatingLiteralBits.IsIEEE = 1259 &C.getTargetInfo().getLongDoubleFormat() == &llvm::APFloat::IEEEquad; 1260 FloatingLiteralBits.IsExact = false; 1261 } 1262 1263public: 1264 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1265 bool isexact, QualType Type, SourceLocation L); 1266 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1267 1268 llvm::APFloat getValue() const { 1269 return APFloatStorage::getValue(FloatingLiteralBits.IsIEEE); 1270 } 1271 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1272 APFloatStorage::setValue(C, Val); 1273 } 1274 1275 bool isExact() const { return FloatingLiteralBits.IsExact; } 1276 void setExact(bool E) { FloatingLiteralBits.IsExact = E; } 1277 1278 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1279 /// double. Note that this may cause loss of precision, but is useful for 1280 /// debugging dumps, etc. 1281 double getValueAsApproximateDouble() const; 1282 1283 SourceLocation getLocation() const { return Loc; } 1284 void setLocation(SourceLocation L) { Loc = L; } 1285 1286 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1287 1288 static bool classof(const Stmt *T) { 1289 return T->getStmtClass() == FloatingLiteralClass; 1290 } 1291 static bool classof(const FloatingLiteral *) { return true; } 1292 1293 // Iterators 1294 child_range children() { return child_range(); } 1295}; 1296 1297/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1298/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1299/// IntegerLiteral classes. Instances of this class always have a Complex type 1300/// whose element type matches the subexpression. 1301/// 1302class ImaginaryLiteral : public Expr { 1303 Stmt *Val; 1304public: 1305 ImaginaryLiteral(Expr *val, QualType Ty) 1306 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1307 false, false), 1308 Val(val) {} 1309 1310 /// \brief Build an empty imaginary literal. 1311 explicit ImaginaryLiteral(EmptyShell Empty) 1312 : Expr(ImaginaryLiteralClass, Empty) { } 1313 1314 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1315 Expr *getSubExpr() { return cast<Expr>(Val); } 1316 void setSubExpr(Expr *E) { Val = E; } 1317 1318 SourceRange getSourceRange() const LLVM_READONLY { return Val->getSourceRange(); } 1319 static bool classof(const Stmt *T) { 1320 return T->getStmtClass() == ImaginaryLiteralClass; 1321 } 1322 static bool classof(const ImaginaryLiteral *) { return true; } 1323 1324 // Iterators 1325 child_range children() { return child_range(&Val, &Val+1); } 1326}; 1327 1328/// StringLiteral - This represents a string literal expression, e.g. "foo" 1329/// or L"bar" (wide strings). The actual string is returned by getStrData() 1330/// is NOT null-terminated, and the length of the string is determined by 1331/// calling getByteLength(). The C type for a string is always a 1332/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1333/// not. 1334/// 1335/// Note that strings in C can be formed by concatenation of multiple string 1336/// literal pptokens in translation phase #6. This keeps track of the locations 1337/// of each of these pieces. 1338/// 1339/// Strings in C can also be truncated and extended by assigning into arrays, 1340/// e.g. with constructs like: 1341/// char X[2] = "foobar"; 1342/// In this case, getByteLength() will return 6, but the string literal will 1343/// have type "char[2]". 1344class StringLiteral : public Expr { 1345public: 1346 enum StringKind { 1347 Ascii, 1348 Wide, 1349 UTF8, 1350 UTF16, 1351 UTF32 1352 }; 1353 1354private: 1355 friend class ASTStmtReader; 1356 1357 union { 1358 const char *asChar; 1359 const uint16_t *asUInt16; 1360 const uint32_t *asUInt32; 1361 } StrData; 1362 unsigned Length; 1363 unsigned CharByteWidth : 4; 1364 unsigned Kind : 3; 1365 unsigned IsPascal : 1; 1366 unsigned NumConcatenated; 1367 SourceLocation TokLocs[1]; 1368 1369 StringLiteral(QualType Ty) : 1370 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1371 false) {} 1372 1373 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1374 1375public: 1376 /// This is the "fully general" constructor that allows representation of 1377 /// strings formed from multiple concatenated tokens. 1378 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1379 bool Pascal, QualType Ty, 1380 const SourceLocation *Loc, unsigned NumStrs); 1381 1382 /// Simple constructor for string literals made from one token. 1383 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1384 bool Pascal, QualType Ty, 1385 SourceLocation Loc) { 1386 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1387 } 1388 1389 /// \brief Construct an empty string literal. 1390 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1391 1392 StringRef getString() const { 1393 assert(CharByteWidth==1 1394 && "This function is used in places that assume strings use char"); 1395 return StringRef(StrData.asChar, getByteLength()); 1396 } 1397 1398 /// Allow access to clients that need the byte representation, such as 1399 /// ASTWriterStmt::VisitStringLiteral(). 1400 StringRef getBytes() const { 1401 // FIXME: StringRef may not be the right type to use as a result for this. 1402 if (CharByteWidth == 1) 1403 return StringRef(StrData.asChar, getByteLength()); 1404 if (CharByteWidth == 4) 1405 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1406 getByteLength()); 1407 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1408 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1409 getByteLength()); 1410 } 1411 1412 void outputString(raw_ostream &OS); 1413 1414 uint32_t getCodeUnit(size_t i) const { 1415 assert(i < Length && "out of bounds access"); 1416 if (CharByteWidth == 1) 1417 return static_cast<unsigned char>(StrData.asChar[i]); 1418 if (CharByteWidth == 4) 1419 return StrData.asUInt32[i]; 1420 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1421 return StrData.asUInt16[i]; 1422 } 1423 1424 unsigned getByteLength() const { return CharByteWidth*Length; } 1425 unsigned getLength() const { return Length; } 1426 unsigned getCharByteWidth() const { return CharByteWidth; } 1427 1428 /// \brief Sets the string data to the given string data. 1429 void setString(ASTContext &C, StringRef Str, 1430 StringKind Kind, bool IsPascal); 1431 1432 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1433 1434 1435 bool isAscii() const { return Kind == Ascii; } 1436 bool isWide() const { return Kind == Wide; } 1437 bool isUTF8() const { return Kind == UTF8; } 1438 bool isUTF16() const { return Kind == UTF16; } 1439 bool isUTF32() const { return Kind == UTF32; } 1440 bool isPascal() const { return IsPascal; } 1441 1442 bool containsNonAsciiOrNull() const { 1443 StringRef Str = getString(); 1444 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1445 if (!isascii(Str[i]) || !Str[i]) 1446 return true; 1447 return false; 1448 } 1449 1450 /// getNumConcatenated - Get the number of string literal tokens that were 1451 /// concatenated in translation phase #6 to form this string literal. 1452 unsigned getNumConcatenated() const { return NumConcatenated; } 1453 1454 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1455 assert(TokNum < NumConcatenated && "Invalid tok number"); 1456 return TokLocs[TokNum]; 1457 } 1458 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1459 assert(TokNum < NumConcatenated && "Invalid tok number"); 1460 TokLocs[TokNum] = L; 1461 } 1462 1463 /// getLocationOfByte - Return a source location that points to the specified 1464 /// byte of this string literal. 1465 /// 1466 /// Strings are amazingly complex. They can be formed from multiple tokens 1467 /// and can have escape sequences in them in addition to the usual trigraph 1468 /// and escaped newline business. This routine handles this complexity. 1469 /// 1470 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1471 const LangOptions &Features, 1472 const TargetInfo &Target) const; 1473 1474 typedef const SourceLocation *tokloc_iterator; 1475 tokloc_iterator tokloc_begin() const { return TokLocs; } 1476 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1477 1478 SourceRange getSourceRange() const LLVM_READONLY { 1479 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1480 } 1481 static bool classof(const Stmt *T) { 1482 return T->getStmtClass() == StringLiteralClass; 1483 } 1484 static bool classof(const StringLiteral *) { return true; } 1485 1486 // Iterators 1487 child_range children() { return child_range(); } 1488}; 1489 1490/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1491/// AST node is only formed if full location information is requested. 1492class ParenExpr : public Expr { 1493 SourceLocation L, R; 1494 Stmt *Val; 1495public: 1496 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1497 : Expr(ParenExprClass, val->getType(), 1498 val->getValueKind(), val->getObjectKind(), 1499 val->isTypeDependent(), val->isValueDependent(), 1500 val->isInstantiationDependent(), 1501 val->containsUnexpandedParameterPack()), 1502 L(l), R(r), Val(val) {} 1503 1504 /// \brief Construct an empty parenthesized expression. 1505 explicit ParenExpr(EmptyShell Empty) 1506 : Expr(ParenExprClass, Empty) { } 1507 1508 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1509 Expr *getSubExpr() { return cast<Expr>(Val); } 1510 void setSubExpr(Expr *E) { Val = E; } 1511 1512 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(L, R); } 1513 1514 /// \brief Get the location of the left parentheses '('. 1515 SourceLocation getLParen() const { return L; } 1516 void setLParen(SourceLocation Loc) { L = Loc; } 1517 1518 /// \brief Get the location of the right parentheses ')'. 1519 SourceLocation getRParen() const { return R; } 1520 void setRParen(SourceLocation Loc) { R = Loc; } 1521 1522 static bool classof(const Stmt *T) { 1523 return T->getStmtClass() == ParenExprClass; 1524 } 1525 static bool classof(const ParenExpr *) { return true; } 1526 1527 // Iterators 1528 child_range children() { return child_range(&Val, &Val+1); } 1529}; 1530 1531 1532/// UnaryOperator - This represents the unary-expression's (except sizeof and 1533/// alignof), the postinc/postdec operators from postfix-expression, and various 1534/// extensions. 1535/// 1536/// Notes on various nodes: 1537/// 1538/// Real/Imag - These return the real/imag part of a complex operand. If 1539/// applied to a non-complex value, the former returns its operand and the 1540/// later returns zero in the type of the operand. 1541/// 1542class UnaryOperator : public Expr { 1543public: 1544 typedef UnaryOperatorKind Opcode; 1545 1546private: 1547 unsigned Opc : 5; 1548 SourceLocation Loc; 1549 Stmt *Val; 1550public: 1551 1552 UnaryOperator(Expr *input, Opcode opc, QualType type, 1553 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1554 : Expr(UnaryOperatorClass, type, VK, OK, 1555 input->isTypeDependent() || type->isDependentType(), 1556 input->isValueDependent(), 1557 (input->isInstantiationDependent() || 1558 type->isInstantiationDependentType()), 1559 input->containsUnexpandedParameterPack()), 1560 Opc(opc), Loc(l), Val(input) {} 1561 1562 /// \brief Build an empty unary operator. 1563 explicit UnaryOperator(EmptyShell Empty) 1564 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1565 1566 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1567 void setOpcode(Opcode O) { Opc = O; } 1568 1569 Expr *getSubExpr() const { return cast<Expr>(Val); } 1570 void setSubExpr(Expr *E) { Val = E; } 1571 1572 /// getOperatorLoc - Return the location of the operator. 1573 SourceLocation getOperatorLoc() const { return Loc; } 1574 void setOperatorLoc(SourceLocation L) { Loc = L; } 1575 1576 /// isPostfix - Return true if this is a postfix operation, like x++. 1577 static bool isPostfix(Opcode Op) { 1578 return Op == UO_PostInc || Op == UO_PostDec; 1579 } 1580 1581 /// isPrefix - Return true if this is a prefix operation, like --x. 1582 static bool isPrefix(Opcode Op) { 1583 return Op == UO_PreInc || Op == UO_PreDec; 1584 } 1585 1586 bool isPrefix() const { return isPrefix(getOpcode()); } 1587 bool isPostfix() const { return isPostfix(getOpcode()); } 1588 1589 static bool isIncrementOp(Opcode Op) { 1590 return Op == UO_PreInc || Op == UO_PostInc; 1591 } 1592 bool isIncrementOp() const { 1593 return isIncrementOp(getOpcode()); 1594 } 1595 1596 static bool isDecrementOp(Opcode Op) { 1597 return Op == UO_PreDec || Op == UO_PostDec; 1598 } 1599 bool isDecrementOp() const { 1600 return isDecrementOp(getOpcode()); 1601 } 1602 1603 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1604 bool isIncrementDecrementOp() const { 1605 return isIncrementDecrementOp(getOpcode()); 1606 } 1607 1608 static bool isArithmeticOp(Opcode Op) { 1609 return Op >= UO_Plus && Op <= UO_LNot; 1610 } 1611 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1612 1613 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1614 /// corresponds to, e.g. "sizeof" or "[pre]++" 1615 static const char *getOpcodeStr(Opcode Op); 1616 1617 /// \brief Retrieve the unary opcode that corresponds to the given 1618 /// overloaded operator. 1619 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1620 1621 /// \brief Retrieve the overloaded operator kind that corresponds to 1622 /// the given unary opcode. 1623 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1624 1625 SourceRange getSourceRange() const LLVM_READONLY { 1626 if (isPostfix()) 1627 return SourceRange(Val->getLocStart(), Loc); 1628 else 1629 return SourceRange(Loc, Val->getLocEnd()); 1630 } 1631 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; } 1632 1633 static bool classof(const Stmt *T) { 1634 return T->getStmtClass() == UnaryOperatorClass; 1635 } 1636 static bool classof(const UnaryOperator *) { return true; } 1637 1638 // Iterators 1639 child_range children() { return child_range(&Val, &Val+1); } 1640}; 1641 1642/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1643/// offsetof(record-type, member-designator). For example, given: 1644/// @code 1645/// struct S { 1646/// float f; 1647/// double d; 1648/// }; 1649/// struct T { 1650/// int i; 1651/// struct S s[10]; 1652/// }; 1653/// @endcode 1654/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1655 1656class OffsetOfExpr : public Expr { 1657public: 1658 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1659 class OffsetOfNode { 1660 public: 1661 /// \brief The kind of offsetof node we have. 1662 enum Kind { 1663 /// \brief An index into an array. 1664 Array = 0x00, 1665 /// \brief A field. 1666 Field = 0x01, 1667 /// \brief A field in a dependent type, known only by its name. 1668 Identifier = 0x02, 1669 /// \brief An implicit indirection through a C++ base class, when the 1670 /// field found is in a base class. 1671 Base = 0x03 1672 }; 1673 1674 private: 1675 enum { MaskBits = 2, Mask = 0x03 }; 1676 1677 /// \brief The source range that covers this part of the designator. 1678 SourceRange Range; 1679 1680 /// \brief The data describing the designator, which comes in three 1681 /// different forms, depending on the lower two bits. 1682 /// - An unsigned index into the array of Expr*'s stored after this node 1683 /// in memory, for [constant-expression] designators. 1684 /// - A FieldDecl*, for references to a known field. 1685 /// - An IdentifierInfo*, for references to a field with a given name 1686 /// when the class type is dependent. 1687 /// - A CXXBaseSpecifier*, for references that look at a field in a 1688 /// base class. 1689 uintptr_t Data; 1690 1691 public: 1692 /// \brief Create an offsetof node that refers to an array element. 1693 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1694 SourceLocation RBracketLoc) 1695 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1696 1697 /// \brief Create an offsetof node that refers to a field. 1698 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1699 SourceLocation NameLoc) 1700 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1701 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1702 1703 /// \brief Create an offsetof node that refers to an identifier. 1704 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1705 SourceLocation NameLoc) 1706 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1707 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1708 1709 /// \brief Create an offsetof node that refers into a C++ base class. 1710 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1711 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1712 1713 /// \brief Determine what kind of offsetof node this is. 1714 Kind getKind() const { 1715 return static_cast<Kind>(Data & Mask); 1716 } 1717 1718 /// \brief For an array element node, returns the index into the array 1719 /// of expressions. 1720 unsigned getArrayExprIndex() const { 1721 assert(getKind() == Array); 1722 return Data >> 2; 1723 } 1724 1725 /// \brief For a field offsetof node, returns the field. 1726 FieldDecl *getField() const { 1727 assert(getKind() == Field); 1728 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1729 } 1730 1731 /// \brief For a field or identifier offsetof node, returns the name of 1732 /// the field. 1733 IdentifierInfo *getFieldName() const; 1734 1735 /// \brief For a base class node, returns the base specifier. 1736 CXXBaseSpecifier *getBase() const { 1737 assert(getKind() == Base); 1738 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1739 } 1740 1741 /// \brief Retrieve the source range that covers this offsetof node. 1742 /// 1743 /// For an array element node, the source range contains the locations of 1744 /// the square brackets. For a field or identifier node, the source range 1745 /// contains the location of the period (if there is one) and the 1746 /// identifier. 1747 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 1748 }; 1749 1750private: 1751 1752 SourceLocation OperatorLoc, RParenLoc; 1753 // Base type; 1754 TypeSourceInfo *TSInfo; 1755 // Number of sub-components (i.e. instances of OffsetOfNode). 1756 unsigned NumComps; 1757 // Number of sub-expressions (i.e. array subscript expressions). 1758 unsigned NumExprs; 1759 1760 OffsetOfExpr(ASTContext &C, QualType type, 1761 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1762 OffsetOfNode* compsPtr, unsigned numComps, 1763 Expr** exprsPtr, unsigned numExprs, 1764 SourceLocation RParenLoc); 1765 1766 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1767 : Expr(OffsetOfExprClass, EmptyShell()), 1768 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1769 1770public: 1771 1772 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1773 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1774 OffsetOfNode* compsPtr, unsigned numComps, 1775 Expr** exprsPtr, unsigned numExprs, 1776 SourceLocation RParenLoc); 1777 1778 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1779 unsigned NumComps, unsigned NumExprs); 1780 1781 /// getOperatorLoc - Return the location of the operator. 1782 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1783 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1784 1785 /// \brief Return the location of the right parentheses. 1786 SourceLocation getRParenLoc() const { return RParenLoc; } 1787 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1788 1789 TypeSourceInfo *getTypeSourceInfo() const { 1790 return TSInfo; 1791 } 1792 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1793 TSInfo = tsi; 1794 } 1795 1796 const OffsetOfNode &getComponent(unsigned Idx) const { 1797 assert(Idx < NumComps && "Subscript out of range"); 1798 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1799 } 1800 1801 void setComponent(unsigned Idx, OffsetOfNode ON) { 1802 assert(Idx < NumComps && "Subscript out of range"); 1803 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1804 } 1805 1806 unsigned getNumComponents() const { 1807 return NumComps; 1808 } 1809 1810 Expr* getIndexExpr(unsigned Idx) { 1811 assert(Idx < NumExprs && "Subscript out of range"); 1812 return reinterpret_cast<Expr **>( 1813 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1814 } 1815 const Expr *getIndexExpr(unsigned Idx) const { 1816 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1817 } 1818 1819 void setIndexExpr(unsigned Idx, Expr* E) { 1820 assert(Idx < NumComps && "Subscript out of range"); 1821 reinterpret_cast<Expr **>( 1822 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1823 } 1824 1825 unsigned getNumExpressions() const { 1826 return NumExprs; 1827 } 1828 1829 SourceRange getSourceRange() const LLVM_READONLY { 1830 return SourceRange(OperatorLoc, RParenLoc); 1831 } 1832 1833 static bool classof(const Stmt *T) { 1834 return T->getStmtClass() == OffsetOfExprClass; 1835 } 1836 1837 static bool classof(const OffsetOfExpr *) { return true; } 1838 1839 // Iterators 1840 child_range children() { 1841 Stmt **begin = 1842 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1843 + NumComps); 1844 return child_range(begin, begin + NumExprs); 1845 } 1846}; 1847 1848/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1849/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1850/// vec_step (OpenCL 1.1 6.11.12). 1851class UnaryExprOrTypeTraitExpr : public Expr { 1852 union { 1853 TypeSourceInfo *Ty; 1854 Stmt *Ex; 1855 } Argument; 1856 SourceLocation OpLoc, RParenLoc; 1857 1858public: 1859 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1860 QualType resultType, SourceLocation op, 1861 SourceLocation rp) : 1862 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1863 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1864 // Value-dependent if the argument is type-dependent. 1865 TInfo->getType()->isDependentType(), 1866 TInfo->getType()->isInstantiationDependentType(), 1867 TInfo->getType()->containsUnexpandedParameterPack()), 1868 OpLoc(op), RParenLoc(rp) { 1869 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1870 UnaryExprOrTypeTraitExprBits.IsType = true; 1871 Argument.Ty = TInfo; 1872 } 1873 1874 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1875 QualType resultType, SourceLocation op, 1876 SourceLocation rp) : 1877 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1878 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1879 // Value-dependent if the argument is type-dependent. 1880 E->isTypeDependent(), 1881 E->isInstantiationDependent(), 1882 E->containsUnexpandedParameterPack()), 1883 OpLoc(op), RParenLoc(rp) { 1884 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1885 UnaryExprOrTypeTraitExprBits.IsType = false; 1886 Argument.Ex = E; 1887 } 1888 1889 /// \brief Construct an empty sizeof/alignof expression. 1890 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1891 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1892 1893 UnaryExprOrTypeTrait getKind() const { 1894 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind); 1895 } 1896 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;} 1897 1898 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; } 1899 QualType getArgumentType() const { 1900 return getArgumentTypeInfo()->getType(); 1901 } 1902 TypeSourceInfo *getArgumentTypeInfo() const { 1903 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1904 return Argument.Ty; 1905 } 1906 Expr *getArgumentExpr() { 1907 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1908 return static_cast<Expr*>(Argument.Ex); 1909 } 1910 const Expr *getArgumentExpr() const { 1911 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1912 } 1913 1914 void setArgument(Expr *E) { 1915 Argument.Ex = E; 1916 UnaryExprOrTypeTraitExprBits.IsType = false; 1917 } 1918 void setArgument(TypeSourceInfo *TInfo) { 1919 Argument.Ty = TInfo; 1920 UnaryExprOrTypeTraitExprBits.IsType = true; 1921 } 1922 1923 /// Gets the argument type, or the type of the argument expression, whichever 1924 /// is appropriate. 1925 QualType getTypeOfArgument() const { 1926 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1927 } 1928 1929 SourceLocation getOperatorLoc() const { return OpLoc; } 1930 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1931 1932 SourceLocation getRParenLoc() const { return RParenLoc; } 1933 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1934 1935 SourceRange getSourceRange() const LLVM_READONLY { 1936 return SourceRange(OpLoc, RParenLoc); 1937 } 1938 1939 static bool classof(const Stmt *T) { 1940 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1941 } 1942 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1943 1944 // Iterators 1945 child_range children(); 1946}; 1947 1948//===----------------------------------------------------------------------===// 1949// Postfix Operators. 1950//===----------------------------------------------------------------------===// 1951 1952/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1953class ArraySubscriptExpr : public Expr { 1954 enum { LHS, RHS, END_EXPR=2 }; 1955 Stmt* SubExprs[END_EXPR]; 1956 SourceLocation RBracketLoc; 1957public: 1958 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1959 ExprValueKind VK, ExprObjectKind OK, 1960 SourceLocation rbracketloc) 1961 : Expr(ArraySubscriptExprClass, t, VK, OK, 1962 lhs->isTypeDependent() || rhs->isTypeDependent(), 1963 lhs->isValueDependent() || rhs->isValueDependent(), 1964 (lhs->isInstantiationDependent() || 1965 rhs->isInstantiationDependent()), 1966 (lhs->containsUnexpandedParameterPack() || 1967 rhs->containsUnexpandedParameterPack())), 1968 RBracketLoc(rbracketloc) { 1969 SubExprs[LHS] = lhs; 1970 SubExprs[RHS] = rhs; 1971 } 1972 1973 /// \brief Create an empty array subscript expression. 1974 explicit ArraySubscriptExpr(EmptyShell Shell) 1975 : Expr(ArraySubscriptExprClass, Shell) { } 1976 1977 /// An array access can be written A[4] or 4[A] (both are equivalent). 1978 /// - getBase() and getIdx() always present the normalized view: A[4]. 1979 /// In this case getBase() returns "A" and getIdx() returns "4". 1980 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1981 /// 4[A] getLHS() returns "4". 1982 /// Note: Because vector element access is also written A[4] we must 1983 /// predicate the format conversion in getBase and getIdx only on the 1984 /// the type of the RHS, as it is possible for the LHS to be a vector of 1985 /// integer type 1986 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1987 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1988 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1989 1990 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1991 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1992 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1993 1994 Expr *getBase() { 1995 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1996 } 1997 1998 const Expr *getBase() const { 1999 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 2000 } 2001 2002 Expr *getIdx() { 2003 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2004 } 2005 2006 const Expr *getIdx() const { 2007 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2008 } 2009 2010 SourceRange getSourceRange() const LLVM_READONLY { 2011 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 2012 } 2013 2014 SourceLocation getRBracketLoc() const { return RBracketLoc; } 2015 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 2016 2017 SourceLocation getExprLoc() const LLVM_READONLY { return getBase()->getExprLoc(); } 2018 2019 static bool classof(const Stmt *T) { 2020 return T->getStmtClass() == ArraySubscriptExprClass; 2021 } 2022 static bool classof(const ArraySubscriptExpr *) { return true; } 2023 2024 // Iterators 2025 child_range children() { 2026 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2027 } 2028}; 2029 2030 2031/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 2032/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 2033/// while its subclasses may represent alternative syntax that (semantically) 2034/// results in a function call. For example, CXXOperatorCallExpr is 2035/// a subclass for overloaded operator calls that use operator syntax, e.g., 2036/// "str1 + str2" to resolve to a function call. 2037class CallExpr : public Expr { 2038 enum { FN=0, PREARGS_START=1 }; 2039 Stmt **SubExprs; 2040 unsigned NumArgs; 2041 SourceLocation RParenLoc; 2042 2043protected: 2044 // These versions of the constructor are for derived classes. 2045 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 2046 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 2047 SourceLocation rparenloc); 2048 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 2049 2050 Stmt *getPreArg(unsigned i) { 2051 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2052 return SubExprs[PREARGS_START+i]; 2053 } 2054 const Stmt *getPreArg(unsigned i) const { 2055 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2056 return SubExprs[PREARGS_START+i]; 2057 } 2058 void setPreArg(unsigned i, Stmt *PreArg) { 2059 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2060 SubExprs[PREARGS_START+i] = PreArg; 2061 } 2062 2063 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2064 2065public: 2066 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 2067 ExprValueKind VK, SourceLocation rparenloc); 2068 2069 /// \brief Build an empty call expression. 2070 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 2071 2072 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2073 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2074 void setCallee(Expr *F) { SubExprs[FN] = F; } 2075 2076 Decl *getCalleeDecl(); 2077 const Decl *getCalleeDecl() const { 2078 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2079 } 2080 2081 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2082 FunctionDecl *getDirectCallee(); 2083 const FunctionDecl *getDirectCallee() const { 2084 return const_cast<CallExpr*>(this)->getDirectCallee(); 2085 } 2086 2087 /// getNumArgs - Return the number of actual arguments to this call. 2088 /// 2089 unsigned getNumArgs() const { return NumArgs; } 2090 2091 /// \brief Retrieve the call arguments. 2092 Expr **getArgs() { 2093 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2094 } 2095 const Expr *const *getArgs() const { 2096 return const_cast<CallExpr*>(this)->getArgs(); 2097 } 2098 2099 /// getArg - Return the specified argument. 2100 Expr *getArg(unsigned Arg) { 2101 assert(Arg < NumArgs && "Arg access out of range!"); 2102 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2103 } 2104 const Expr *getArg(unsigned Arg) const { 2105 assert(Arg < NumArgs && "Arg access out of range!"); 2106 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2107 } 2108 2109 /// setArg - Set the specified argument. 2110 void setArg(unsigned Arg, Expr *ArgExpr) { 2111 assert(Arg < NumArgs && "Arg access out of range!"); 2112 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2113 } 2114 2115 /// setNumArgs - This changes the number of arguments present in this call. 2116 /// Any orphaned expressions are deleted by this, and any new operands are set 2117 /// to null. 2118 void setNumArgs(ASTContext& C, unsigned NumArgs); 2119 2120 typedef ExprIterator arg_iterator; 2121 typedef ConstExprIterator const_arg_iterator; 2122 2123 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2124 arg_iterator arg_end() { 2125 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2126 } 2127 const_arg_iterator arg_begin() const { 2128 return SubExprs+PREARGS_START+getNumPreArgs(); 2129 } 2130 const_arg_iterator arg_end() const { 2131 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2132 } 2133 2134 /// getNumCommas - Return the number of commas that must have been present in 2135 /// this function call. 2136 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2137 2138 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2139 /// not, return 0. 2140 unsigned isBuiltinCall() const; 2141 2142 /// getCallReturnType - Get the return type of the call expr. This is not 2143 /// always the type of the expr itself, if the return type is a reference 2144 /// type. 2145 QualType getCallReturnType() const; 2146 2147 SourceLocation getRParenLoc() const { return RParenLoc; } 2148 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2149 2150 SourceRange getSourceRange() const LLVM_READONLY; 2151 SourceLocation getLocStart() const LLVM_READONLY; 2152 SourceLocation getLocEnd() const LLVM_READONLY; 2153 2154 static bool classof(const Stmt *T) { 2155 return T->getStmtClass() >= firstCallExprConstant && 2156 T->getStmtClass() <= lastCallExprConstant; 2157 } 2158 static bool classof(const CallExpr *) { return true; } 2159 2160 // Iterators 2161 child_range children() { 2162 return child_range(&SubExprs[0], 2163 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2164 } 2165}; 2166 2167/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2168/// 2169class MemberExpr : public Expr { 2170 /// Extra data stored in some member expressions. 2171 struct MemberNameQualifier { 2172 /// \brief The nested-name-specifier that qualifies the name, including 2173 /// source-location information. 2174 NestedNameSpecifierLoc QualifierLoc; 2175 2176 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2177 /// name qualifiers. 2178 DeclAccessPair FoundDecl; 2179 }; 2180 2181 /// Base - the expression for the base pointer or structure references. In 2182 /// X.F, this is "X". 2183 Stmt *Base; 2184 2185 /// MemberDecl - This is the decl being referenced by the field/member name. 2186 /// In X.F, this is the decl referenced by F. 2187 ValueDecl *MemberDecl; 2188 2189 /// MemberDNLoc - Provides source/type location info for the 2190 /// declaration name embedded in MemberDecl. 2191 DeclarationNameLoc MemberDNLoc; 2192 2193 /// MemberLoc - This is the location of the member name. 2194 SourceLocation MemberLoc; 2195 2196 /// IsArrow - True if this is "X->F", false if this is "X.F". 2197 bool IsArrow : 1; 2198 2199 /// \brief True if this member expression used a nested-name-specifier to 2200 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2201 /// declaration. When true, a MemberNameQualifier 2202 /// structure is allocated immediately after the MemberExpr. 2203 bool HasQualifierOrFoundDecl : 1; 2204 2205 /// \brief True if this member expression specified a template keyword 2206 /// and/or a template argument list explicitly, e.g., x->f<int>, 2207 /// x->template f, x->template f<int>. 2208 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2209 /// TemplateArguments (if any) are allocated immediately after 2210 /// the MemberExpr or, if the member expression also has a qualifier, 2211 /// after the MemberNameQualifier structure. 2212 bool HasTemplateKWAndArgsInfo : 1; 2213 2214 /// \brief True if this member expression refers to a method that 2215 /// was resolved from an overloaded set having size greater than 1. 2216 bool HadMultipleCandidates : 1; 2217 2218 /// \brief Retrieve the qualifier that preceded the member name, if any. 2219 MemberNameQualifier *getMemberQualifier() { 2220 assert(HasQualifierOrFoundDecl); 2221 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2222 } 2223 2224 /// \brief Retrieve the qualifier that preceded the member name, if any. 2225 const MemberNameQualifier *getMemberQualifier() const { 2226 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2227 } 2228 2229public: 2230 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2231 const DeclarationNameInfo &NameInfo, QualType ty, 2232 ExprValueKind VK, ExprObjectKind OK) 2233 : Expr(MemberExprClass, ty, VK, OK, 2234 base->isTypeDependent(), 2235 base->isValueDependent(), 2236 base->isInstantiationDependent(), 2237 base->containsUnexpandedParameterPack()), 2238 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()), 2239 MemberLoc(NameInfo.getLoc()), IsArrow(isarrow), 2240 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2241 HadMultipleCandidates(false) { 2242 assert(memberdecl->getDeclName() == NameInfo.getName()); 2243 } 2244 2245 // NOTE: this constructor should be used only when it is known that 2246 // the member name can not provide additional syntactic info 2247 // (i.e., source locations for C++ operator names or type source info 2248 // for constructors, destructors and conversion operators). 2249 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2250 SourceLocation l, QualType ty, 2251 ExprValueKind VK, ExprObjectKind OK) 2252 : Expr(MemberExprClass, ty, VK, OK, 2253 base->isTypeDependent(), base->isValueDependent(), 2254 base->isInstantiationDependent(), 2255 base->containsUnexpandedParameterPack()), 2256 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l), 2257 IsArrow(isarrow), 2258 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2259 HadMultipleCandidates(false) {} 2260 2261 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2262 NestedNameSpecifierLoc QualifierLoc, 2263 SourceLocation TemplateKWLoc, 2264 ValueDecl *memberdecl, DeclAccessPair founddecl, 2265 DeclarationNameInfo MemberNameInfo, 2266 const TemplateArgumentListInfo *targs, 2267 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2268 2269 void setBase(Expr *E) { Base = E; } 2270 Expr *getBase() const { return cast<Expr>(Base); } 2271 2272 /// \brief Retrieve the member declaration to which this expression refers. 2273 /// 2274 /// The returned declaration will either be a FieldDecl or (in C++) 2275 /// a CXXMethodDecl. 2276 ValueDecl *getMemberDecl() const { return MemberDecl; } 2277 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2278 2279 /// \brief Retrieves the declaration found by lookup. 2280 DeclAccessPair getFoundDecl() const { 2281 if (!HasQualifierOrFoundDecl) 2282 return DeclAccessPair::make(getMemberDecl(), 2283 getMemberDecl()->getAccess()); 2284 return getMemberQualifier()->FoundDecl; 2285 } 2286 2287 /// \brief Determines whether this member expression actually had 2288 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2289 /// x->Base::foo. 2290 bool hasQualifier() const { return getQualifier() != 0; } 2291 2292 /// \brief If the member name was qualified, retrieves the 2293 /// nested-name-specifier that precedes the member name. Otherwise, returns 2294 /// NULL. 2295 NestedNameSpecifier *getQualifier() const { 2296 if (!HasQualifierOrFoundDecl) 2297 return 0; 2298 2299 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2300 } 2301 2302 /// \brief If the member name was qualified, retrieves the 2303 /// nested-name-specifier that precedes the member name, with source-location 2304 /// information. 2305 NestedNameSpecifierLoc getQualifierLoc() const { 2306 if (!hasQualifier()) 2307 return NestedNameSpecifierLoc(); 2308 2309 return getMemberQualifier()->QualifierLoc; 2310 } 2311 2312 /// \brief Return the optional template keyword and arguments info. 2313 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 2314 if (!HasTemplateKWAndArgsInfo) 2315 return 0; 2316 2317 if (!HasQualifierOrFoundDecl) 2318 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 2319 2320 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 2321 getMemberQualifier() + 1); 2322 } 2323 2324 /// \brief Return the optional template keyword and arguments info. 2325 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 2326 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo(); 2327 } 2328 2329 /// \brief Retrieve the location of the template keyword preceding 2330 /// the member name, if any. 2331 SourceLocation getTemplateKeywordLoc() const { 2332 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2333 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 2334 } 2335 2336 /// \brief Retrieve the location of the left angle bracket starting the 2337 /// explicit template argument list following the member name, if any. 2338 SourceLocation getLAngleLoc() const { 2339 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2340 return getTemplateKWAndArgsInfo()->LAngleLoc; 2341 } 2342 2343 /// \brief Retrieve the location of the right angle bracket ending the 2344 /// explicit template argument list following the member name, if any. 2345 SourceLocation getRAngleLoc() const { 2346 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2347 return getTemplateKWAndArgsInfo()->RAngleLoc; 2348 } 2349 2350 /// Determines whether the member name was preceded by the template keyword. 2351 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2352 2353 /// \brief Determines whether the member name was followed by an 2354 /// explicit template argument list. 2355 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2356 2357 /// \brief Copies the template arguments (if present) into the given 2358 /// structure. 2359 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2360 if (hasExplicitTemplateArgs()) 2361 getExplicitTemplateArgs().copyInto(List); 2362 } 2363 2364 /// \brief Retrieve the explicit template argument list that 2365 /// follow the member template name. This must only be called on an 2366 /// expression with explicit template arguments. 2367 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2368 assert(hasExplicitTemplateArgs()); 2369 return *getTemplateKWAndArgsInfo(); 2370 } 2371 2372 /// \brief Retrieve the explicit template argument list that 2373 /// followed the member template name. This must only be called on 2374 /// an expression with explicit template arguments. 2375 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2376 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2377 } 2378 2379 /// \brief Retrieves the optional explicit template arguments. 2380 /// This points to the same data as getExplicitTemplateArgs(), but 2381 /// returns null if there are no explicit template arguments. 2382 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2383 if (!hasExplicitTemplateArgs()) return 0; 2384 return &getExplicitTemplateArgs(); 2385 } 2386 2387 /// \brief Retrieve the template arguments provided as part of this 2388 /// template-id. 2389 const TemplateArgumentLoc *getTemplateArgs() const { 2390 if (!hasExplicitTemplateArgs()) 2391 return 0; 2392 2393 return getExplicitTemplateArgs().getTemplateArgs(); 2394 } 2395 2396 /// \brief Retrieve the number of template arguments provided as part of this 2397 /// template-id. 2398 unsigned getNumTemplateArgs() const { 2399 if (!hasExplicitTemplateArgs()) 2400 return 0; 2401 2402 return getExplicitTemplateArgs().NumTemplateArgs; 2403 } 2404 2405 /// \brief Retrieve the member declaration name info. 2406 DeclarationNameInfo getMemberNameInfo() const { 2407 return DeclarationNameInfo(MemberDecl->getDeclName(), 2408 MemberLoc, MemberDNLoc); 2409 } 2410 2411 bool isArrow() const { return IsArrow; } 2412 void setArrow(bool A) { IsArrow = A; } 2413 2414 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2415 /// location of 'F'. 2416 SourceLocation getMemberLoc() const { return MemberLoc; } 2417 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2418 2419 SourceRange getSourceRange() const LLVM_READONLY; 2420 SourceLocation getLocStart() const LLVM_READONLY; 2421 SourceLocation getLocEnd() const LLVM_READONLY; 2422 2423 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; } 2424 2425 /// \brief Determine whether the base of this explicit is implicit. 2426 bool isImplicitAccess() const { 2427 return getBase() && getBase()->isImplicitCXXThis(); 2428 } 2429 2430 /// \brief Returns true if this member expression refers to a method that 2431 /// was resolved from an overloaded set having size greater than 1. 2432 bool hadMultipleCandidates() const { 2433 return HadMultipleCandidates; 2434 } 2435 /// \brief Sets the flag telling whether this expression refers to 2436 /// a method that was resolved from an overloaded set having size 2437 /// greater than 1. 2438 void setHadMultipleCandidates(bool V = true) { 2439 HadMultipleCandidates = V; 2440 } 2441 2442 static bool classof(const Stmt *T) { 2443 return T->getStmtClass() == MemberExprClass; 2444 } 2445 static bool classof(const MemberExpr *) { return true; } 2446 2447 // Iterators 2448 child_range children() { return child_range(&Base, &Base+1); } 2449 2450 friend class ASTReader; 2451 friend class ASTStmtWriter; 2452}; 2453 2454/// CompoundLiteralExpr - [C99 6.5.2.5] 2455/// 2456class CompoundLiteralExpr : public Expr { 2457 /// LParenLoc - If non-null, this is the location of the left paren in a 2458 /// compound literal like "(int){4}". This can be null if this is a 2459 /// synthesized compound expression. 2460 SourceLocation LParenLoc; 2461 2462 /// The type as written. This can be an incomplete array type, in 2463 /// which case the actual expression type will be different. 2464 /// The int part of the pair stores whether this expr is file scope. 2465 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope; 2466 Stmt *Init; 2467public: 2468 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2469 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2470 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2471 tinfo->getType()->isDependentType(), 2472 init->isValueDependent(), 2473 (init->isInstantiationDependent() || 2474 tinfo->getType()->isInstantiationDependentType()), 2475 init->containsUnexpandedParameterPack()), 2476 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {} 2477 2478 /// \brief Construct an empty compound literal. 2479 explicit CompoundLiteralExpr(EmptyShell Empty) 2480 : Expr(CompoundLiteralExprClass, Empty) { } 2481 2482 const Expr *getInitializer() const { return cast<Expr>(Init); } 2483 Expr *getInitializer() { return cast<Expr>(Init); } 2484 void setInitializer(Expr *E) { Init = E; } 2485 2486 bool isFileScope() const { return TInfoAndScope.getInt(); } 2487 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); } 2488 2489 SourceLocation getLParenLoc() const { return LParenLoc; } 2490 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2491 2492 TypeSourceInfo *getTypeSourceInfo() const { 2493 return TInfoAndScope.getPointer(); 2494 } 2495 void setTypeSourceInfo(TypeSourceInfo *tinfo) { 2496 TInfoAndScope.setPointer(tinfo); 2497 } 2498 2499 SourceRange getSourceRange() const LLVM_READONLY { 2500 // FIXME: Init should never be null. 2501 if (!Init) 2502 return SourceRange(); 2503 if (LParenLoc.isInvalid()) 2504 return Init->getSourceRange(); 2505 return SourceRange(LParenLoc, Init->getLocEnd()); 2506 } 2507 2508 static bool classof(const Stmt *T) { 2509 return T->getStmtClass() == CompoundLiteralExprClass; 2510 } 2511 static bool classof(const CompoundLiteralExpr *) { return true; } 2512 2513 // Iterators 2514 child_range children() { return child_range(&Init, &Init+1); } 2515}; 2516 2517/// CastExpr - Base class for type casts, including both implicit 2518/// casts (ImplicitCastExpr) and explicit casts that have some 2519/// representation in the source code (ExplicitCastExpr's derived 2520/// classes). 2521class CastExpr : public Expr { 2522public: 2523 typedef clang::CastKind CastKind; 2524 2525private: 2526 Stmt *Op; 2527 2528 void CheckCastConsistency() const; 2529 2530 const CXXBaseSpecifier * const *path_buffer() const { 2531 return const_cast<CastExpr*>(this)->path_buffer(); 2532 } 2533 CXXBaseSpecifier **path_buffer(); 2534 2535 void setBasePathSize(unsigned basePathSize) { 2536 CastExprBits.BasePathSize = basePathSize; 2537 assert(CastExprBits.BasePathSize == basePathSize && 2538 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2539 } 2540 2541protected: 2542 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2543 const CastKind kind, Expr *op, unsigned BasePathSize) : 2544 Expr(SC, ty, VK, OK_Ordinary, 2545 // Cast expressions are type-dependent if the type is 2546 // dependent (C++ [temp.dep.expr]p3). 2547 ty->isDependentType(), 2548 // Cast expressions are value-dependent if the type is 2549 // dependent or if the subexpression is value-dependent. 2550 ty->isDependentType() || (op && op->isValueDependent()), 2551 (ty->isInstantiationDependentType() || 2552 (op && op->isInstantiationDependent())), 2553 (ty->containsUnexpandedParameterPack() || 2554 op->containsUnexpandedParameterPack())), 2555 Op(op) { 2556 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2557 CastExprBits.Kind = kind; 2558 setBasePathSize(BasePathSize); 2559#ifndef NDEBUG 2560 CheckCastConsistency(); 2561#endif 2562 } 2563 2564 /// \brief Construct an empty cast. 2565 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2566 : Expr(SC, Empty) { 2567 setBasePathSize(BasePathSize); 2568 } 2569 2570public: 2571 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2572 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2573 const char *getCastKindName() const; 2574 2575 Expr *getSubExpr() { return cast<Expr>(Op); } 2576 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2577 void setSubExpr(Expr *E) { Op = E; } 2578 2579 /// \brief Retrieve the cast subexpression as it was written in the source 2580 /// code, looking through any implicit casts or other intermediate nodes 2581 /// introduced by semantic analysis. 2582 Expr *getSubExprAsWritten(); 2583 const Expr *getSubExprAsWritten() const { 2584 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2585 } 2586 2587 typedef CXXBaseSpecifier **path_iterator; 2588 typedef const CXXBaseSpecifier * const *path_const_iterator; 2589 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2590 unsigned path_size() const { return CastExprBits.BasePathSize; } 2591 path_iterator path_begin() { return path_buffer(); } 2592 path_iterator path_end() { return path_buffer() + path_size(); } 2593 path_const_iterator path_begin() const { return path_buffer(); } 2594 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2595 2596 void setCastPath(const CXXCastPath &Path); 2597 2598 static bool classof(const Stmt *T) { 2599 return T->getStmtClass() >= firstCastExprConstant && 2600 T->getStmtClass() <= lastCastExprConstant; 2601 } 2602 static bool classof(const CastExpr *) { return true; } 2603 2604 // Iterators 2605 child_range children() { return child_range(&Op, &Op+1); } 2606}; 2607 2608/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2609/// conversions, which have no direct representation in the original 2610/// source code. For example: converting T[]->T*, void f()->void 2611/// (*f)(), float->double, short->int, etc. 2612/// 2613/// In C, implicit casts always produce rvalues. However, in C++, an 2614/// implicit cast whose result is being bound to a reference will be 2615/// an lvalue or xvalue. For example: 2616/// 2617/// @code 2618/// class Base { }; 2619/// class Derived : public Base { }; 2620/// Derived &&ref(); 2621/// void f(Derived d) { 2622/// Base& b = d; // initializer is an ImplicitCastExpr 2623/// // to an lvalue of type Base 2624/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2625/// // to an xvalue of type Base 2626/// } 2627/// @endcode 2628class ImplicitCastExpr : public CastExpr { 2629private: 2630 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2631 unsigned BasePathLength, ExprValueKind VK) 2632 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2633 } 2634 2635 /// \brief Construct an empty implicit cast. 2636 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2637 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2638 2639public: 2640 enum OnStack_t { OnStack }; 2641 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2642 ExprValueKind VK) 2643 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2644 } 2645 2646 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2647 CastKind Kind, Expr *Operand, 2648 const CXXCastPath *BasePath, 2649 ExprValueKind Cat); 2650 2651 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2652 2653 SourceRange getSourceRange() const LLVM_READONLY { 2654 return getSubExpr()->getSourceRange(); 2655 } 2656 SourceLocation getLocStart() const LLVM_READONLY { 2657 return getSubExpr()->getLocStart(); 2658 } 2659 SourceLocation getLocEnd() const LLVM_READONLY { 2660 return getSubExpr()->getLocEnd(); 2661 } 2662 2663 static bool classof(const Stmt *T) { 2664 return T->getStmtClass() == ImplicitCastExprClass; 2665 } 2666 static bool classof(const ImplicitCastExpr *) { return true; } 2667}; 2668 2669inline Expr *Expr::IgnoreImpCasts() { 2670 Expr *e = this; 2671 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2672 e = ice->getSubExpr(); 2673 return e; 2674} 2675 2676/// ExplicitCastExpr - An explicit cast written in the source 2677/// code. 2678/// 2679/// This class is effectively an abstract class, because it provides 2680/// the basic representation of an explicitly-written cast without 2681/// specifying which kind of cast (C cast, functional cast, static 2682/// cast, etc.) was written; specific derived classes represent the 2683/// particular style of cast and its location information. 2684/// 2685/// Unlike implicit casts, explicit cast nodes have two different 2686/// types: the type that was written into the source code, and the 2687/// actual type of the expression as determined by semantic 2688/// analysis. These types may differ slightly. For example, in C++ one 2689/// can cast to a reference type, which indicates that the resulting 2690/// expression will be an lvalue or xvalue. The reference type, however, 2691/// will not be used as the type of the expression. 2692class ExplicitCastExpr : public CastExpr { 2693 /// TInfo - Source type info for the (written) type 2694 /// this expression is casting to. 2695 TypeSourceInfo *TInfo; 2696 2697protected: 2698 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2699 CastKind kind, Expr *op, unsigned PathSize, 2700 TypeSourceInfo *writtenTy) 2701 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2702 2703 /// \brief Construct an empty explicit cast. 2704 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2705 : CastExpr(SC, Shell, PathSize) { } 2706 2707public: 2708 /// getTypeInfoAsWritten - Returns the type source info for the type 2709 /// that this expression is casting to. 2710 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2711 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2712 2713 /// getTypeAsWritten - Returns the type that this expression is 2714 /// casting to, as written in the source code. 2715 QualType getTypeAsWritten() const { return TInfo->getType(); } 2716 2717 static bool classof(const Stmt *T) { 2718 return T->getStmtClass() >= firstExplicitCastExprConstant && 2719 T->getStmtClass() <= lastExplicitCastExprConstant; 2720 } 2721 static bool classof(const ExplicitCastExpr *) { return true; } 2722}; 2723 2724/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2725/// cast in C++ (C++ [expr.cast]), which uses the syntax 2726/// (Type)expr. For example: @c (int)f. 2727class CStyleCastExpr : public ExplicitCastExpr { 2728 SourceLocation LPLoc; // the location of the left paren 2729 SourceLocation RPLoc; // the location of the right paren 2730 2731 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2732 unsigned PathSize, TypeSourceInfo *writtenTy, 2733 SourceLocation l, SourceLocation r) 2734 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2735 writtenTy), LPLoc(l), RPLoc(r) {} 2736 2737 /// \brief Construct an empty C-style explicit cast. 2738 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2739 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2740 2741public: 2742 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2743 ExprValueKind VK, CastKind K, 2744 Expr *Op, const CXXCastPath *BasePath, 2745 TypeSourceInfo *WrittenTy, SourceLocation L, 2746 SourceLocation R); 2747 2748 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2749 2750 SourceLocation getLParenLoc() const { return LPLoc; } 2751 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2752 2753 SourceLocation getRParenLoc() const { return RPLoc; } 2754 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2755 2756 SourceRange getSourceRange() const LLVM_READONLY { 2757 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2758 } 2759 static bool classof(const Stmt *T) { 2760 return T->getStmtClass() == CStyleCastExprClass; 2761 } 2762 static bool classof(const CStyleCastExpr *) { return true; } 2763}; 2764 2765/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2766/// 2767/// This expression node kind describes a builtin binary operation, 2768/// such as "x + y" for integer values "x" and "y". The operands will 2769/// already have been converted to appropriate types (e.g., by 2770/// performing promotions or conversions). 2771/// 2772/// In C++, where operators may be overloaded, a different kind of 2773/// expression node (CXXOperatorCallExpr) is used to express the 2774/// invocation of an overloaded operator with operator syntax. Within 2775/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2776/// used to store an expression "x + y" depends on the subexpressions 2777/// for x and y. If neither x or y is type-dependent, and the "+" 2778/// operator resolves to a built-in operation, BinaryOperator will be 2779/// used to express the computation (x and y may still be 2780/// value-dependent). If either x or y is type-dependent, or if the 2781/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2782/// be used to express the computation. 2783class BinaryOperator : public Expr { 2784public: 2785 typedef BinaryOperatorKind Opcode; 2786 2787private: 2788 unsigned Opc : 6; 2789 SourceLocation OpLoc; 2790 2791 enum { LHS, RHS, END_EXPR }; 2792 Stmt* SubExprs[END_EXPR]; 2793public: 2794 2795 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2796 ExprValueKind VK, ExprObjectKind OK, 2797 SourceLocation opLoc) 2798 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2799 lhs->isTypeDependent() || rhs->isTypeDependent(), 2800 lhs->isValueDependent() || rhs->isValueDependent(), 2801 (lhs->isInstantiationDependent() || 2802 rhs->isInstantiationDependent()), 2803 (lhs->containsUnexpandedParameterPack() || 2804 rhs->containsUnexpandedParameterPack())), 2805 Opc(opc), OpLoc(opLoc) { 2806 SubExprs[LHS] = lhs; 2807 SubExprs[RHS] = rhs; 2808 assert(!isCompoundAssignmentOp() && 2809 "Use ArithAssignBinaryOperator for compound assignments"); 2810 } 2811 2812 /// \brief Construct an empty binary operator. 2813 explicit BinaryOperator(EmptyShell Empty) 2814 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2815 2816 SourceLocation getExprLoc() const LLVM_READONLY { return OpLoc; } 2817 SourceLocation getOperatorLoc() const { return OpLoc; } 2818 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2819 2820 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2821 void setOpcode(Opcode O) { Opc = O; } 2822 2823 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2824 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2825 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2826 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2827 2828 SourceRange getSourceRange() const LLVM_READONLY { 2829 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2830 } 2831 2832 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2833 /// corresponds to, e.g. "<<=". 2834 static const char *getOpcodeStr(Opcode Op); 2835 2836 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2837 2838 /// \brief Retrieve the binary opcode that corresponds to the given 2839 /// overloaded operator. 2840 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2841 2842 /// \brief Retrieve the overloaded operator kind that corresponds to 2843 /// the given binary opcode. 2844 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2845 2846 /// predicates to categorize the respective opcodes. 2847 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2848 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2849 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2850 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2851 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2852 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2853 2854 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2855 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2856 2857 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2858 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2859 2860 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2861 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2862 2863 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2864 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2865 2866 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2867 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2868 2869 static bool isAssignmentOp(Opcode Opc) { 2870 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2871 } 2872 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2873 2874 static bool isCompoundAssignmentOp(Opcode Opc) { 2875 return Opc > BO_Assign && Opc <= BO_OrAssign; 2876 } 2877 bool isCompoundAssignmentOp() const { 2878 return isCompoundAssignmentOp(getOpcode()); 2879 } 2880 static Opcode getOpForCompoundAssignment(Opcode Opc) { 2881 assert(isCompoundAssignmentOp(Opc)); 2882 if (Opc >= BO_AndAssign) 2883 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 2884 else 2885 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 2886 } 2887 2888 static bool isShiftAssignOp(Opcode Opc) { 2889 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2890 } 2891 bool isShiftAssignOp() const { 2892 return isShiftAssignOp(getOpcode()); 2893 } 2894 2895 static bool classof(const Stmt *S) { 2896 return S->getStmtClass() >= firstBinaryOperatorConstant && 2897 S->getStmtClass() <= lastBinaryOperatorConstant; 2898 } 2899 static bool classof(const BinaryOperator *) { return true; } 2900 2901 // Iterators 2902 child_range children() { 2903 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2904 } 2905 2906protected: 2907 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2908 ExprValueKind VK, ExprObjectKind OK, 2909 SourceLocation opLoc, bool dead) 2910 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2911 lhs->isTypeDependent() || rhs->isTypeDependent(), 2912 lhs->isValueDependent() || rhs->isValueDependent(), 2913 (lhs->isInstantiationDependent() || 2914 rhs->isInstantiationDependent()), 2915 (lhs->containsUnexpandedParameterPack() || 2916 rhs->containsUnexpandedParameterPack())), 2917 Opc(opc), OpLoc(opLoc) { 2918 SubExprs[LHS] = lhs; 2919 SubExprs[RHS] = rhs; 2920 } 2921 2922 BinaryOperator(StmtClass SC, EmptyShell Empty) 2923 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2924}; 2925 2926/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2927/// track of the type the operation is performed in. Due to the semantics of 2928/// these operators, the operands are promoted, the arithmetic performed, an 2929/// implicit conversion back to the result type done, then the assignment takes 2930/// place. This captures the intermediate type which the computation is done 2931/// in. 2932class CompoundAssignOperator : public BinaryOperator { 2933 QualType ComputationLHSType; 2934 QualType ComputationResultType; 2935public: 2936 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2937 ExprValueKind VK, ExprObjectKind OK, 2938 QualType CompLHSType, QualType CompResultType, 2939 SourceLocation OpLoc) 2940 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2941 ComputationLHSType(CompLHSType), 2942 ComputationResultType(CompResultType) { 2943 assert(isCompoundAssignmentOp() && 2944 "Only should be used for compound assignments"); 2945 } 2946 2947 /// \brief Build an empty compound assignment operator expression. 2948 explicit CompoundAssignOperator(EmptyShell Empty) 2949 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2950 2951 // The two computation types are the type the LHS is converted 2952 // to for the computation and the type of the result; the two are 2953 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2954 QualType getComputationLHSType() const { return ComputationLHSType; } 2955 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2956 2957 QualType getComputationResultType() const { return ComputationResultType; } 2958 void setComputationResultType(QualType T) { ComputationResultType = T; } 2959 2960 static bool classof(const CompoundAssignOperator *) { return true; } 2961 static bool classof(const Stmt *S) { 2962 return S->getStmtClass() == CompoundAssignOperatorClass; 2963 } 2964}; 2965 2966/// AbstractConditionalOperator - An abstract base class for 2967/// ConditionalOperator and BinaryConditionalOperator. 2968class AbstractConditionalOperator : public Expr { 2969 SourceLocation QuestionLoc, ColonLoc; 2970 friend class ASTStmtReader; 2971 2972protected: 2973 AbstractConditionalOperator(StmtClass SC, QualType T, 2974 ExprValueKind VK, ExprObjectKind OK, 2975 bool TD, bool VD, bool ID, 2976 bool ContainsUnexpandedParameterPack, 2977 SourceLocation qloc, 2978 SourceLocation cloc) 2979 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 2980 QuestionLoc(qloc), ColonLoc(cloc) {} 2981 2982 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2983 : Expr(SC, Empty) { } 2984 2985public: 2986 // getCond - Return the expression representing the condition for 2987 // the ?: operator. 2988 Expr *getCond() const; 2989 2990 // getTrueExpr - Return the subexpression representing the value of 2991 // the expression if the condition evaluates to true. 2992 Expr *getTrueExpr() const; 2993 2994 // getFalseExpr - Return the subexpression representing the value of 2995 // the expression if the condition evaluates to false. This is 2996 // the same as getRHS. 2997 Expr *getFalseExpr() const; 2998 2999 SourceLocation getQuestionLoc() const { return QuestionLoc; } 3000 SourceLocation getColonLoc() const { return ColonLoc; } 3001 3002 static bool classof(const Stmt *T) { 3003 return T->getStmtClass() == ConditionalOperatorClass || 3004 T->getStmtClass() == BinaryConditionalOperatorClass; 3005 } 3006 static bool classof(const AbstractConditionalOperator *) { return true; } 3007}; 3008 3009/// ConditionalOperator - The ?: ternary operator. The GNU "missing 3010/// middle" extension is a BinaryConditionalOperator. 3011class ConditionalOperator : public AbstractConditionalOperator { 3012 enum { COND, LHS, RHS, END_EXPR }; 3013 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3014 3015 friend class ASTStmtReader; 3016public: 3017 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 3018 SourceLocation CLoc, Expr *rhs, 3019 QualType t, ExprValueKind VK, ExprObjectKind OK) 3020 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 3021 // FIXME: the type of the conditional operator doesn't 3022 // depend on the type of the conditional, but the standard 3023 // seems to imply that it could. File a bug! 3024 (lhs->isTypeDependent() || rhs->isTypeDependent()), 3025 (cond->isValueDependent() || lhs->isValueDependent() || 3026 rhs->isValueDependent()), 3027 (cond->isInstantiationDependent() || 3028 lhs->isInstantiationDependent() || 3029 rhs->isInstantiationDependent()), 3030 (cond->containsUnexpandedParameterPack() || 3031 lhs->containsUnexpandedParameterPack() || 3032 rhs->containsUnexpandedParameterPack()), 3033 QLoc, CLoc) { 3034 SubExprs[COND] = cond; 3035 SubExprs[LHS] = lhs; 3036 SubExprs[RHS] = rhs; 3037 } 3038 3039 /// \brief Build an empty conditional operator. 3040 explicit ConditionalOperator(EmptyShell Empty) 3041 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 3042 3043 // getCond - Return the expression representing the condition for 3044 // the ?: operator. 3045 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3046 3047 // getTrueExpr - Return the subexpression representing the value of 3048 // the expression if the condition evaluates to true. 3049 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3050 3051 // getFalseExpr - Return the subexpression representing the value of 3052 // the expression if the condition evaluates to false. This is 3053 // the same as getRHS. 3054 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3055 3056 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3057 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3058 3059 SourceRange getSourceRange() const LLVM_READONLY { 3060 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 3061 } 3062 static bool classof(const Stmt *T) { 3063 return T->getStmtClass() == ConditionalOperatorClass; 3064 } 3065 static bool classof(const ConditionalOperator *) { return true; } 3066 3067 // Iterators 3068 child_range children() { 3069 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3070 } 3071}; 3072 3073/// BinaryConditionalOperator - The GNU extension to the conditional 3074/// operator which allows the middle operand to be omitted. 3075/// 3076/// This is a different expression kind on the assumption that almost 3077/// every client ends up needing to know that these are different. 3078class BinaryConditionalOperator : public AbstractConditionalOperator { 3079 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3080 3081 /// - the common condition/left-hand-side expression, which will be 3082 /// evaluated as the opaque value 3083 /// - the condition, expressed in terms of the opaque value 3084 /// - the left-hand-side, expressed in terms of the opaque value 3085 /// - the right-hand-side 3086 Stmt *SubExprs[NUM_SUBEXPRS]; 3087 OpaqueValueExpr *OpaqueValue; 3088 3089 friend class ASTStmtReader; 3090public: 3091 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3092 Expr *cond, Expr *lhs, Expr *rhs, 3093 SourceLocation qloc, SourceLocation cloc, 3094 QualType t, ExprValueKind VK, ExprObjectKind OK) 3095 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3096 (common->isTypeDependent() || rhs->isTypeDependent()), 3097 (common->isValueDependent() || rhs->isValueDependent()), 3098 (common->isInstantiationDependent() || 3099 rhs->isInstantiationDependent()), 3100 (common->containsUnexpandedParameterPack() || 3101 rhs->containsUnexpandedParameterPack()), 3102 qloc, cloc), 3103 OpaqueValue(opaqueValue) { 3104 SubExprs[COMMON] = common; 3105 SubExprs[COND] = cond; 3106 SubExprs[LHS] = lhs; 3107 SubExprs[RHS] = rhs; 3108 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value"); 3109 } 3110 3111 /// \brief Build an empty conditional operator. 3112 explicit BinaryConditionalOperator(EmptyShell Empty) 3113 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3114 3115 /// \brief getCommon - Return the common expression, written to the 3116 /// left of the condition. The opaque value will be bound to the 3117 /// result of this expression. 3118 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3119 3120 /// \brief getOpaqueValue - Return the opaque value placeholder. 3121 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3122 3123 /// \brief getCond - Return the condition expression; this is defined 3124 /// in terms of the opaque value. 3125 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3126 3127 /// \brief getTrueExpr - Return the subexpression which will be 3128 /// evaluated if the condition evaluates to true; this is defined 3129 /// in terms of the opaque value. 3130 Expr *getTrueExpr() const { 3131 return cast<Expr>(SubExprs[LHS]); 3132 } 3133 3134 /// \brief getFalseExpr - Return the subexpression which will be 3135 /// evaluated if the condnition evaluates to false; this is 3136 /// defined in terms of the opaque value. 3137 Expr *getFalseExpr() const { 3138 return cast<Expr>(SubExprs[RHS]); 3139 } 3140 3141 SourceRange getSourceRange() const LLVM_READONLY { 3142 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 3143 } 3144 static bool classof(const Stmt *T) { 3145 return T->getStmtClass() == BinaryConditionalOperatorClass; 3146 } 3147 static bool classof(const BinaryConditionalOperator *) { return true; } 3148 3149 // Iterators 3150 child_range children() { 3151 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3152 } 3153}; 3154 3155inline Expr *AbstractConditionalOperator::getCond() const { 3156 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3157 return co->getCond(); 3158 return cast<BinaryConditionalOperator>(this)->getCond(); 3159} 3160 3161inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3162 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3163 return co->getTrueExpr(); 3164 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3165} 3166 3167inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3168 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3169 return co->getFalseExpr(); 3170 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3171} 3172 3173/// AddrLabelExpr - The GNU address of label extension, representing &&label. 3174class AddrLabelExpr : public Expr { 3175 SourceLocation AmpAmpLoc, LabelLoc; 3176 LabelDecl *Label; 3177public: 3178 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3179 QualType t) 3180 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3181 false), 3182 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3183 3184 /// \brief Build an empty address of a label expression. 3185 explicit AddrLabelExpr(EmptyShell Empty) 3186 : Expr(AddrLabelExprClass, Empty) { } 3187 3188 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3189 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3190 SourceLocation getLabelLoc() const { return LabelLoc; } 3191 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3192 3193 SourceRange getSourceRange() const LLVM_READONLY { 3194 return SourceRange(AmpAmpLoc, LabelLoc); 3195 } 3196 3197 LabelDecl *getLabel() const { return Label; } 3198 void setLabel(LabelDecl *L) { Label = L; } 3199 3200 static bool classof(const Stmt *T) { 3201 return T->getStmtClass() == AddrLabelExprClass; 3202 } 3203 static bool classof(const AddrLabelExpr *) { return true; } 3204 3205 // Iterators 3206 child_range children() { return child_range(); } 3207}; 3208 3209/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3210/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3211/// takes the value of the last subexpression. 3212/// 3213/// A StmtExpr is always an r-value; values "returned" out of a 3214/// StmtExpr will be copied. 3215class StmtExpr : public Expr { 3216 Stmt *SubStmt; 3217 SourceLocation LParenLoc, RParenLoc; 3218public: 3219 // FIXME: Does type-dependence need to be computed differently? 3220 // FIXME: Do we need to compute instantiation instantiation-dependence for 3221 // statements? (ugh!) 3222 StmtExpr(CompoundStmt *substmt, QualType T, 3223 SourceLocation lp, SourceLocation rp) : 3224 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3225 T->isDependentType(), false, false, false), 3226 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3227 3228 /// \brief Build an empty statement expression. 3229 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3230 3231 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3232 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3233 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3234 3235 SourceRange getSourceRange() const LLVM_READONLY { 3236 return SourceRange(LParenLoc, RParenLoc); 3237 } 3238 3239 SourceLocation getLParenLoc() const { return LParenLoc; } 3240 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3241 SourceLocation getRParenLoc() const { return RParenLoc; } 3242 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3243 3244 static bool classof(const Stmt *T) { 3245 return T->getStmtClass() == StmtExprClass; 3246 } 3247 static bool classof(const StmtExpr *) { return true; } 3248 3249 // Iterators 3250 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3251}; 3252 3253 3254/// ShuffleVectorExpr - clang-specific builtin-in function 3255/// __builtin_shufflevector. 3256/// This AST node represents a operator that does a constant 3257/// shuffle, similar to LLVM's shufflevector instruction. It takes 3258/// two vectors and a variable number of constant indices, 3259/// and returns the appropriately shuffled vector. 3260class ShuffleVectorExpr : public Expr { 3261 SourceLocation BuiltinLoc, RParenLoc; 3262 3263 // SubExprs - the list of values passed to the __builtin_shufflevector 3264 // function. The first two are vectors, and the rest are constant 3265 // indices. The number of values in this list is always 3266 // 2+the number of indices in the vector type. 3267 Stmt **SubExprs; 3268 unsigned NumExprs; 3269 3270public: 3271 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3272 QualType Type, SourceLocation BLoc, 3273 SourceLocation RP); 3274 3275 /// \brief Build an empty vector-shuffle expression. 3276 explicit ShuffleVectorExpr(EmptyShell Empty) 3277 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3278 3279 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3280 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3281 3282 SourceLocation getRParenLoc() const { return RParenLoc; } 3283 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3284 3285 SourceRange getSourceRange() const LLVM_READONLY { 3286 return SourceRange(BuiltinLoc, RParenLoc); 3287 } 3288 static bool classof(const Stmt *T) { 3289 return T->getStmtClass() == ShuffleVectorExprClass; 3290 } 3291 static bool classof(const ShuffleVectorExpr *) { return true; } 3292 3293 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3294 /// constant expression, the actual arguments passed in, and the function 3295 /// pointers. 3296 unsigned getNumSubExprs() const { return NumExprs; } 3297 3298 /// \brief Retrieve the array of expressions. 3299 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3300 3301 /// getExpr - Return the Expr at the specified index. 3302 Expr *getExpr(unsigned Index) { 3303 assert((Index < NumExprs) && "Arg access out of range!"); 3304 return cast<Expr>(SubExprs[Index]); 3305 } 3306 const Expr *getExpr(unsigned Index) const { 3307 assert((Index < NumExprs) && "Arg access out of range!"); 3308 return cast<Expr>(SubExprs[Index]); 3309 } 3310 3311 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3312 3313 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3314 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3315 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3316 } 3317 3318 // Iterators 3319 child_range children() { 3320 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3321 } 3322}; 3323 3324/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3325/// This AST node is similar to the conditional operator (?:) in C, with 3326/// the following exceptions: 3327/// - the test expression must be a integer constant expression. 3328/// - the expression returned acts like the chosen subexpression in every 3329/// visible way: the type is the same as that of the chosen subexpression, 3330/// and all predicates (whether it's an l-value, whether it's an integer 3331/// constant expression, etc.) return the same result as for the chosen 3332/// sub-expression. 3333class ChooseExpr : public Expr { 3334 enum { COND, LHS, RHS, END_EXPR }; 3335 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3336 SourceLocation BuiltinLoc, RParenLoc; 3337public: 3338 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3339 QualType t, ExprValueKind VK, ExprObjectKind OK, 3340 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3341 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3342 (cond->isInstantiationDependent() || 3343 lhs->isInstantiationDependent() || 3344 rhs->isInstantiationDependent()), 3345 (cond->containsUnexpandedParameterPack() || 3346 lhs->containsUnexpandedParameterPack() || 3347 rhs->containsUnexpandedParameterPack())), 3348 BuiltinLoc(BLoc), RParenLoc(RP) { 3349 SubExprs[COND] = cond; 3350 SubExprs[LHS] = lhs; 3351 SubExprs[RHS] = rhs; 3352 } 3353 3354 /// \brief Build an empty __builtin_choose_expr. 3355 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3356 3357 /// isConditionTrue - Return whether the condition is true (i.e. not 3358 /// equal to zero). 3359 bool isConditionTrue(const ASTContext &C) const; 3360 3361 /// getChosenSubExpr - Return the subexpression chosen according to the 3362 /// condition. 3363 Expr *getChosenSubExpr(const ASTContext &C) const { 3364 return isConditionTrue(C) ? getLHS() : getRHS(); 3365 } 3366 3367 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3368 void setCond(Expr *E) { SubExprs[COND] = E; } 3369 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3370 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3371 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3372 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3373 3374 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3375 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3376 3377 SourceLocation getRParenLoc() const { return RParenLoc; } 3378 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3379 3380 SourceRange getSourceRange() const LLVM_READONLY { 3381 return SourceRange(BuiltinLoc, RParenLoc); 3382 } 3383 static bool classof(const Stmt *T) { 3384 return T->getStmtClass() == ChooseExprClass; 3385 } 3386 static bool classof(const ChooseExpr *) { return true; } 3387 3388 // Iterators 3389 child_range children() { 3390 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3391 } 3392}; 3393 3394/// GNUNullExpr - Implements the GNU __null extension, which is a name 3395/// for a null pointer constant that has integral type (e.g., int or 3396/// long) and is the same size and alignment as a pointer. The __null 3397/// extension is typically only used by system headers, which define 3398/// NULL as __null in C++ rather than using 0 (which is an integer 3399/// that may not match the size of a pointer). 3400class GNUNullExpr : public Expr { 3401 /// TokenLoc - The location of the __null keyword. 3402 SourceLocation TokenLoc; 3403 3404public: 3405 GNUNullExpr(QualType Ty, SourceLocation Loc) 3406 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3407 false), 3408 TokenLoc(Loc) { } 3409 3410 /// \brief Build an empty GNU __null expression. 3411 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3412 3413 /// getTokenLocation - The location of the __null token. 3414 SourceLocation getTokenLocation() const { return TokenLoc; } 3415 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3416 3417 SourceRange getSourceRange() const LLVM_READONLY { 3418 return SourceRange(TokenLoc); 3419 } 3420 static bool classof(const Stmt *T) { 3421 return T->getStmtClass() == GNUNullExprClass; 3422 } 3423 static bool classof(const GNUNullExpr *) { return true; } 3424 3425 // Iterators 3426 child_range children() { return child_range(); } 3427}; 3428 3429/// VAArgExpr, used for the builtin function __builtin_va_arg. 3430class VAArgExpr : public Expr { 3431 Stmt *Val; 3432 TypeSourceInfo *TInfo; 3433 SourceLocation BuiltinLoc, RParenLoc; 3434public: 3435 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3436 SourceLocation RPLoc, QualType t) 3437 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3438 t->isDependentType(), false, 3439 (TInfo->getType()->isInstantiationDependentType() || 3440 e->isInstantiationDependent()), 3441 (TInfo->getType()->containsUnexpandedParameterPack() || 3442 e->containsUnexpandedParameterPack())), 3443 Val(e), TInfo(TInfo), 3444 BuiltinLoc(BLoc), 3445 RParenLoc(RPLoc) { } 3446 3447 /// \brief Create an empty __builtin_va_arg expression. 3448 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3449 3450 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3451 Expr *getSubExpr() { return cast<Expr>(Val); } 3452 void setSubExpr(Expr *E) { Val = E; } 3453 3454 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3455 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3456 3457 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3458 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3459 3460 SourceLocation getRParenLoc() const { return RParenLoc; } 3461 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3462 3463 SourceRange getSourceRange() const LLVM_READONLY { 3464 return SourceRange(BuiltinLoc, RParenLoc); 3465 } 3466 static bool classof(const Stmt *T) { 3467 return T->getStmtClass() == VAArgExprClass; 3468 } 3469 static bool classof(const VAArgExpr *) { return true; } 3470 3471 // Iterators 3472 child_range children() { return child_range(&Val, &Val+1); } 3473}; 3474 3475/// @brief Describes an C or C++ initializer list. 3476/// 3477/// InitListExpr describes an initializer list, which can be used to 3478/// initialize objects of different types, including 3479/// struct/class/union types, arrays, and vectors. For example: 3480/// 3481/// @code 3482/// struct foo x = { 1, { 2, 3 } }; 3483/// @endcode 3484/// 3485/// Prior to semantic analysis, an initializer list will represent the 3486/// initializer list as written by the user, but will have the 3487/// placeholder type "void". This initializer list is called the 3488/// syntactic form of the initializer, and may contain C99 designated 3489/// initializers (represented as DesignatedInitExprs), initializations 3490/// of subobject members without explicit braces, and so on. Clients 3491/// interested in the original syntax of the initializer list should 3492/// use the syntactic form of the initializer list. 3493/// 3494/// After semantic analysis, the initializer list will represent the 3495/// semantic form of the initializer, where the initializations of all 3496/// subobjects are made explicit with nested InitListExpr nodes and 3497/// C99 designators have been eliminated by placing the designated 3498/// initializations into the subobject they initialize. Additionally, 3499/// any "holes" in the initialization, where no initializer has been 3500/// specified for a particular subobject, will be replaced with 3501/// implicitly-generated ImplicitValueInitExpr expressions that 3502/// value-initialize the subobjects. Note, however, that the 3503/// initializer lists may still have fewer initializers than there are 3504/// elements to initialize within the object. 3505/// 3506/// Given the semantic form of the initializer list, one can retrieve 3507/// the original syntactic form of that initializer list (if it 3508/// exists) using getSyntacticForm(). Since many initializer lists 3509/// have the same syntactic and semantic forms, getSyntacticForm() may 3510/// return NULL, indicating that the current initializer list also 3511/// serves as its syntactic form. 3512class InitListExpr : public Expr { 3513 // FIXME: Eliminate this vector in favor of ASTContext allocation 3514 typedef ASTVector<Stmt *> InitExprsTy; 3515 InitExprsTy InitExprs; 3516 SourceLocation LBraceLoc, RBraceLoc; 3517 3518 /// Contains the initializer list that describes the syntactic form 3519 /// written in the source code. 3520 InitListExpr *SyntacticForm; 3521 3522 /// \brief Either: 3523 /// If this initializer list initializes an array with more elements than 3524 /// there are initializers in the list, specifies an expression to be used 3525 /// for value initialization of the rest of the elements. 3526 /// Or 3527 /// If this initializer list initializes a union, specifies which 3528 /// field within the union will be initialized. 3529 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3530 3531public: 3532 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3533 Expr **initexprs, unsigned numinits, 3534 SourceLocation rbraceloc); 3535 3536 /// \brief Build an empty initializer list. 3537 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3538 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3539 3540 unsigned getNumInits() const { return InitExprs.size(); } 3541 3542 /// \brief Retrieve the set of initializers. 3543 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3544 3545 const Expr *getInit(unsigned Init) const { 3546 assert(Init < getNumInits() && "Initializer access out of range!"); 3547 return cast_or_null<Expr>(InitExprs[Init]); 3548 } 3549 3550 Expr *getInit(unsigned Init) { 3551 assert(Init < getNumInits() && "Initializer access out of range!"); 3552 return cast_or_null<Expr>(InitExprs[Init]); 3553 } 3554 3555 void setInit(unsigned Init, Expr *expr) { 3556 assert(Init < getNumInits() && "Initializer access out of range!"); 3557 InitExprs[Init] = expr; 3558 } 3559 3560 /// \brief Reserve space for some number of initializers. 3561 void reserveInits(ASTContext &C, unsigned NumInits); 3562 3563 /// @brief Specify the number of initializers 3564 /// 3565 /// If there are more than @p NumInits initializers, the remaining 3566 /// initializers will be destroyed. If there are fewer than @p 3567 /// NumInits initializers, NULL expressions will be added for the 3568 /// unknown initializers. 3569 void resizeInits(ASTContext &Context, unsigned NumInits); 3570 3571 /// @brief Updates the initializer at index @p Init with the new 3572 /// expression @p expr, and returns the old expression at that 3573 /// location. 3574 /// 3575 /// When @p Init is out of range for this initializer list, the 3576 /// initializer list will be extended with NULL expressions to 3577 /// accommodate the new entry. 3578 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3579 3580 /// \brief If this initializer list initializes an array with more elements 3581 /// than there are initializers in the list, specifies an expression to be 3582 /// used for value initialization of the rest of the elements. 3583 Expr *getArrayFiller() { 3584 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3585 } 3586 const Expr *getArrayFiller() const { 3587 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3588 } 3589 void setArrayFiller(Expr *filler); 3590 3591 /// \brief Return true if this is an array initializer and its array "filler" 3592 /// has been set. 3593 bool hasArrayFiller() const { return getArrayFiller(); } 3594 3595 /// \brief If this initializes a union, specifies which field in the 3596 /// union to initialize. 3597 /// 3598 /// Typically, this field is the first named field within the 3599 /// union. However, a designated initializer can specify the 3600 /// initialization of a different field within the union. 3601 FieldDecl *getInitializedFieldInUnion() { 3602 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3603 } 3604 const FieldDecl *getInitializedFieldInUnion() const { 3605 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3606 } 3607 void setInitializedFieldInUnion(FieldDecl *FD) { 3608 ArrayFillerOrUnionFieldInit = FD; 3609 } 3610 3611 // Explicit InitListExpr's originate from source code (and have valid source 3612 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3613 bool isExplicit() { 3614 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3615 } 3616 3617 // Is this an initializer for an array of characters, initialized by a string 3618 // literal or an @encode? 3619 bool isStringLiteralInit() const; 3620 3621 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3622 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3623 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3624 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3625 3626 /// @brief Retrieve the initializer list that describes the 3627 /// syntactic form of the initializer. 3628 /// 3629 /// 3630 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3631 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3632 3633 bool hadArrayRangeDesignator() const { 3634 return InitListExprBits.HadArrayRangeDesignator != 0; 3635 } 3636 void sawArrayRangeDesignator(bool ARD = true) { 3637 InitListExprBits.HadArrayRangeDesignator = ARD; 3638 } 3639 3640 bool initializesStdInitializerList() const { 3641 return InitListExprBits.InitializesStdInitializerList != 0; 3642 } 3643 void setInitializesStdInitializerList(bool ISIL = true) { 3644 InitListExprBits.InitializesStdInitializerList = ISIL; 3645 } 3646 3647 SourceRange getSourceRange() const LLVM_READONLY; 3648 3649 static bool classof(const Stmt *T) { 3650 return T->getStmtClass() == InitListExprClass; 3651 } 3652 static bool classof(const InitListExpr *) { return true; } 3653 3654 // Iterators 3655 child_range children() { 3656 if (InitExprs.empty()) return child_range(); 3657 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3658 } 3659 3660 typedef InitExprsTy::iterator iterator; 3661 typedef InitExprsTy::const_iterator const_iterator; 3662 typedef InitExprsTy::reverse_iterator reverse_iterator; 3663 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3664 3665 iterator begin() { return InitExprs.begin(); } 3666 const_iterator begin() const { return InitExprs.begin(); } 3667 iterator end() { return InitExprs.end(); } 3668 const_iterator end() const { return InitExprs.end(); } 3669 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3670 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3671 reverse_iterator rend() { return InitExprs.rend(); } 3672 const_reverse_iterator rend() const { return InitExprs.rend(); } 3673 3674 friend class ASTStmtReader; 3675 friend class ASTStmtWriter; 3676}; 3677 3678/// @brief Represents a C99 designated initializer expression. 3679/// 3680/// A designated initializer expression (C99 6.7.8) contains one or 3681/// more designators (which can be field designators, array 3682/// designators, or GNU array-range designators) followed by an 3683/// expression that initializes the field or element(s) that the 3684/// designators refer to. For example, given: 3685/// 3686/// @code 3687/// struct point { 3688/// double x; 3689/// double y; 3690/// }; 3691/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3692/// @endcode 3693/// 3694/// The InitListExpr contains three DesignatedInitExprs, the first of 3695/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3696/// designators, one array designator for @c [2] followed by one field 3697/// designator for @c .y. The initalization expression will be 1.0. 3698class DesignatedInitExpr : public Expr { 3699public: 3700 /// \brief Forward declaration of the Designator class. 3701 class Designator; 3702 3703private: 3704 /// The location of the '=' or ':' prior to the actual initializer 3705 /// expression. 3706 SourceLocation EqualOrColonLoc; 3707 3708 /// Whether this designated initializer used the GNU deprecated 3709 /// syntax rather than the C99 '=' syntax. 3710 bool GNUSyntax : 1; 3711 3712 /// The number of designators in this initializer expression. 3713 unsigned NumDesignators : 15; 3714 3715 /// The number of subexpressions of this initializer expression, 3716 /// which contains both the initializer and any additional 3717 /// expressions used by array and array-range designators. 3718 unsigned NumSubExprs : 16; 3719 3720 /// \brief The designators in this designated initialization 3721 /// expression. 3722 Designator *Designators; 3723 3724 3725 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3726 const Designator *Designators, 3727 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3728 Expr **IndexExprs, unsigned NumIndexExprs, 3729 Expr *Init); 3730 3731 explicit DesignatedInitExpr(unsigned NumSubExprs) 3732 : Expr(DesignatedInitExprClass, EmptyShell()), 3733 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(0) { } 3734 3735public: 3736 /// A field designator, e.g., ".x". 3737 struct FieldDesignator { 3738 /// Refers to the field that is being initialized. The low bit 3739 /// of this field determines whether this is actually a pointer 3740 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3741 /// initially constructed, a field designator will store an 3742 /// IdentifierInfo*. After semantic analysis has resolved that 3743 /// name, the field designator will instead store a FieldDecl*. 3744 uintptr_t NameOrField; 3745 3746 /// The location of the '.' in the designated initializer. 3747 unsigned DotLoc; 3748 3749 /// The location of the field name in the designated initializer. 3750 unsigned FieldLoc; 3751 }; 3752 3753 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3754 struct ArrayOrRangeDesignator { 3755 /// Location of the first index expression within the designated 3756 /// initializer expression's list of subexpressions. 3757 unsigned Index; 3758 /// The location of the '[' starting the array range designator. 3759 unsigned LBracketLoc; 3760 /// The location of the ellipsis separating the start and end 3761 /// indices. Only valid for GNU array-range designators. 3762 unsigned EllipsisLoc; 3763 /// The location of the ']' terminating the array range designator. 3764 unsigned RBracketLoc; 3765 }; 3766 3767 /// @brief Represents a single C99 designator. 3768 /// 3769 /// @todo This class is infuriatingly similar to clang::Designator, 3770 /// but minor differences (storing indices vs. storing pointers) 3771 /// keep us from reusing it. Try harder, later, to rectify these 3772 /// differences. 3773 class Designator { 3774 /// @brief The kind of designator this describes. 3775 enum { 3776 FieldDesignator, 3777 ArrayDesignator, 3778 ArrayRangeDesignator 3779 } Kind; 3780 3781 union { 3782 /// A field designator, e.g., ".x". 3783 struct FieldDesignator Field; 3784 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3785 struct ArrayOrRangeDesignator ArrayOrRange; 3786 }; 3787 friend class DesignatedInitExpr; 3788 3789 public: 3790 Designator() {} 3791 3792 /// @brief Initializes a field designator. 3793 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3794 SourceLocation FieldLoc) 3795 : Kind(FieldDesignator) { 3796 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3797 Field.DotLoc = DotLoc.getRawEncoding(); 3798 Field.FieldLoc = FieldLoc.getRawEncoding(); 3799 } 3800 3801 /// @brief Initializes an array designator. 3802 Designator(unsigned Index, SourceLocation LBracketLoc, 3803 SourceLocation RBracketLoc) 3804 : Kind(ArrayDesignator) { 3805 ArrayOrRange.Index = Index; 3806 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3807 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3808 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3809 } 3810 3811 /// @brief Initializes a GNU array-range designator. 3812 Designator(unsigned Index, SourceLocation LBracketLoc, 3813 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3814 : Kind(ArrayRangeDesignator) { 3815 ArrayOrRange.Index = Index; 3816 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3817 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3818 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3819 } 3820 3821 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3822 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3823 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3824 3825 IdentifierInfo *getFieldName() const; 3826 3827 FieldDecl *getField() const { 3828 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3829 if (Field.NameOrField & 0x01) 3830 return 0; 3831 else 3832 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3833 } 3834 3835 void setField(FieldDecl *FD) { 3836 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3837 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3838 } 3839 3840 SourceLocation getDotLoc() const { 3841 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3842 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3843 } 3844 3845 SourceLocation getFieldLoc() const { 3846 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3847 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3848 } 3849 3850 SourceLocation getLBracketLoc() const { 3851 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3852 "Only valid on an array or array-range designator"); 3853 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3854 } 3855 3856 SourceLocation getRBracketLoc() const { 3857 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3858 "Only valid on an array or array-range designator"); 3859 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3860 } 3861 3862 SourceLocation getEllipsisLoc() const { 3863 assert(Kind == ArrayRangeDesignator && 3864 "Only valid on an array-range designator"); 3865 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3866 } 3867 3868 unsigned getFirstExprIndex() const { 3869 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3870 "Only valid on an array or array-range designator"); 3871 return ArrayOrRange.Index; 3872 } 3873 3874 SourceLocation getStartLocation() const { 3875 if (Kind == FieldDesignator) 3876 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3877 else 3878 return getLBracketLoc(); 3879 } 3880 SourceLocation getEndLocation() const { 3881 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3882 } 3883 SourceRange getSourceRange() const LLVM_READONLY { 3884 return SourceRange(getStartLocation(), getEndLocation()); 3885 } 3886 }; 3887 3888 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3889 unsigned NumDesignators, 3890 Expr **IndexExprs, unsigned NumIndexExprs, 3891 SourceLocation EqualOrColonLoc, 3892 bool GNUSyntax, Expr *Init); 3893 3894 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3895 3896 /// @brief Returns the number of designators in this initializer. 3897 unsigned size() const { return NumDesignators; } 3898 3899 // Iterator access to the designators. 3900 typedef Designator *designators_iterator; 3901 designators_iterator designators_begin() { return Designators; } 3902 designators_iterator designators_end() { 3903 return Designators + NumDesignators; 3904 } 3905 3906 typedef const Designator *const_designators_iterator; 3907 const_designators_iterator designators_begin() const { return Designators; } 3908 const_designators_iterator designators_end() const { 3909 return Designators + NumDesignators; 3910 } 3911 3912 typedef std::reverse_iterator<designators_iterator> 3913 reverse_designators_iterator; 3914 reverse_designators_iterator designators_rbegin() { 3915 return reverse_designators_iterator(designators_end()); 3916 } 3917 reverse_designators_iterator designators_rend() { 3918 return reverse_designators_iterator(designators_begin()); 3919 } 3920 3921 typedef std::reverse_iterator<const_designators_iterator> 3922 const_reverse_designators_iterator; 3923 const_reverse_designators_iterator designators_rbegin() const { 3924 return const_reverse_designators_iterator(designators_end()); 3925 } 3926 const_reverse_designators_iterator designators_rend() const { 3927 return const_reverse_designators_iterator(designators_begin()); 3928 } 3929 3930 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3931 3932 void setDesignators(ASTContext &C, const Designator *Desigs, 3933 unsigned NumDesigs); 3934 3935 Expr *getArrayIndex(const Designator& D); 3936 Expr *getArrayRangeStart(const Designator& D); 3937 Expr *getArrayRangeEnd(const Designator& D); 3938 3939 /// @brief Retrieve the location of the '=' that precedes the 3940 /// initializer value itself, if present. 3941 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3942 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3943 3944 /// @brief Determines whether this designated initializer used the 3945 /// deprecated GNU syntax for designated initializers. 3946 bool usesGNUSyntax() const { return GNUSyntax; } 3947 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3948 3949 /// @brief Retrieve the initializer value. 3950 Expr *getInit() const { 3951 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3952 } 3953 3954 void setInit(Expr *init) { 3955 *child_begin() = init; 3956 } 3957 3958 /// \brief Retrieve the total number of subexpressions in this 3959 /// designated initializer expression, including the actual 3960 /// initialized value and any expressions that occur within array 3961 /// and array-range designators. 3962 unsigned getNumSubExprs() const { return NumSubExprs; } 3963 3964 Expr *getSubExpr(unsigned Idx) { 3965 assert(Idx < NumSubExprs && "Subscript out of range"); 3966 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3967 Ptr += sizeof(DesignatedInitExpr); 3968 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3969 } 3970 3971 void setSubExpr(unsigned Idx, Expr *E) { 3972 assert(Idx < NumSubExprs && "Subscript out of range"); 3973 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3974 Ptr += sizeof(DesignatedInitExpr); 3975 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3976 } 3977 3978 /// \brief Replaces the designator at index @p Idx with the series 3979 /// of designators in [First, Last). 3980 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3981 const Designator *Last); 3982 3983 SourceRange getDesignatorsSourceRange() const; 3984 3985 SourceRange getSourceRange() const LLVM_READONLY; 3986 3987 static bool classof(const Stmt *T) { 3988 return T->getStmtClass() == DesignatedInitExprClass; 3989 } 3990 static bool classof(const DesignatedInitExpr *) { return true; } 3991 3992 // Iterators 3993 child_range children() { 3994 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3995 return child_range(begin, begin + NumSubExprs); 3996 } 3997}; 3998 3999/// \brief Represents an implicitly-generated value initialization of 4000/// an object of a given type. 4001/// 4002/// Implicit value initializations occur within semantic initializer 4003/// list expressions (InitListExpr) as placeholders for subobject 4004/// initializations not explicitly specified by the user. 4005/// 4006/// \see InitListExpr 4007class ImplicitValueInitExpr : public Expr { 4008public: 4009 explicit ImplicitValueInitExpr(QualType ty) 4010 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 4011 false, false, ty->isInstantiationDependentType(), false) { } 4012 4013 /// \brief Construct an empty implicit value initialization. 4014 explicit ImplicitValueInitExpr(EmptyShell Empty) 4015 : Expr(ImplicitValueInitExprClass, Empty) { } 4016 4017 static bool classof(const Stmt *T) { 4018 return T->getStmtClass() == ImplicitValueInitExprClass; 4019 } 4020 static bool classof(const ImplicitValueInitExpr *) { return true; } 4021 4022 SourceRange getSourceRange() const LLVM_READONLY { 4023 return SourceRange(); 4024 } 4025 4026 // Iterators 4027 child_range children() { return child_range(); } 4028}; 4029 4030 4031class ParenListExpr : public Expr { 4032 Stmt **Exprs; 4033 unsigned NumExprs; 4034 SourceLocation LParenLoc, RParenLoc; 4035 4036public: 4037 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 4038 unsigned numexprs, SourceLocation rparenloc); 4039 4040 /// \brief Build an empty paren list. 4041 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 4042 4043 unsigned getNumExprs() const { return NumExprs; } 4044 4045 const Expr* getExpr(unsigned Init) const { 4046 assert(Init < getNumExprs() && "Initializer access out of range!"); 4047 return cast_or_null<Expr>(Exprs[Init]); 4048 } 4049 4050 Expr* getExpr(unsigned Init) { 4051 assert(Init < getNumExprs() && "Initializer access out of range!"); 4052 return cast_or_null<Expr>(Exprs[Init]); 4053 } 4054 4055 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 4056 4057 SourceLocation getLParenLoc() const { return LParenLoc; } 4058 SourceLocation getRParenLoc() const { return RParenLoc; } 4059 4060 SourceRange getSourceRange() const LLVM_READONLY { 4061 return SourceRange(LParenLoc, RParenLoc); 4062 } 4063 static bool classof(const Stmt *T) { 4064 return T->getStmtClass() == ParenListExprClass; 4065 } 4066 static bool classof(const ParenListExpr *) { return true; } 4067 4068 // Iterators 4069 child_range children() { 4070 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4071 } 4072 4073 friend class ASTStmtReader; 4074 friend class ASTStmtWriter; 4075}; 4076 4077 4078/// \brief Represents a C11 generic selection. 4079/// 4080/// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4081/// expression, followed by one or more generic associations. Each generic 4082/// association specifies a type name and an expression, or "default" and an 4083/// expression (in which case it is known as a default generic association). 4084/// The type and value of the generic selection are identical to those of its 4085/// result expression, which is defined as the expression in the generic 4086/// association with a type name that is compatible with the type of the 4087/// controlling expression, or the expression in the default generic association 4088/// if no types are compatible. For example: 4089/// 4090/// @code 4091/// _Generic(X, double: 1, float: 2, default: 3) 4092/// @endcode 4093/// 4094/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4095/// or 3 if "hello". 4096/// 4097/// As an extension, generic selections are allowed in C++, where the following 4098/// additional semantics apply: 4099/// 4100/// Any generic selection whose controlling expression is type-dependent or 4101/// which names a dependent type in its association list is result-dependent, 4102/// which means that the choice of result expression is dependent. 4103/// Result-dependent generic associations are both type- and value-dependent. 4104class GenericSelectionExpr : public Expr { 4105 enum { CONTROLLING, END_EXPR }; 4106 TypeSourceInfo **AssocTypes; 4107 Stmt **SubExprs; 4108 unsigned NumAssocs, ResultIndex; 4109 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4110 4111public: 4112 GenericSelectionExpr(ASTContext &Context, 4113 SourceLocation GenericLoc, Expr *ControllingExpr, 4114 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4115 unsigned NumAssocs, SourceLocation DefaultLoc, 4116 SourceLocation RParenLoc, 4117 bool ContainsUnexpandedParameterPack, 4118 unsigned ResultIndex); 4119 4120 /// This constructor is used in the result-dependent case. 4121 GenericSelectionExpr(ASTContext &Context, 4122 SourceLocation GenericLoc, Expr *ControllingExpr, 4123 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4124 unsigned NumAssocs, SourceLocation DefaultLoc, 4125 SourceLocation RParenLoc, 4126 bool ContainsUnexpandedParameterPack); 4127 4128 explicit GenericSelectionExpr(EmptyShell Empty) 4129 : Expr(GenericSelectionExprClass, Empty) { } 4130 4131 unsigned getNumAssocs() const { return NumAssocs; } 4132 4133 SourceLocation getGenericLoc() const { return GenericLoc; } 4134 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4135 SourceLocation getRParenLoc() const { return RParenLoc; } 4136 4137 const Expr *getAssocExpr(unsigned i) const { 4138 return cast<Expr>(SubExprs[END_EXPR+i]); 4139 } 4140 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4141 4142 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4143 return AssocTypes[i]; 4144 } 4145 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4146 4147 QualType getAssocType(unsigned i) const { 4148 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4149 return TS->getType(); 4150 else 4151 return QualType(); 4152 } 4153 4154 const Expr *getControllingExpr() const { 4155 return cast<Expr>(SubExprs[CONTROLLING]); 4156 } 4157 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4158 4159 /// Whether this generic selection is result-dependent. 4160 bool isResultDependent() const { return ResultIndex == -1U; } 4161 4162 /// The zero-based index of the result expression's generic association in 4163 /// the generic selection's association list. Defined only if the 4164 /// generic selection is not result-dependent. 4165 unsigned getResultIndex() const { 4166 assert(!isResultDependent() && "Generic selection is result-dependent"); 4167 return ResultIndex; 4168 } 4169 4170 /// The generic selection's result expression. Defined only if the 4171 /// generic selection is not result-dependent. 4172 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4173 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4174 4175 SourceRange getSourceRange() const LLVM_READONLY { 4176 return SourceRange(GenericLoc, RParenLoc); 4177 } 4178 static bool classof(const Stmt *T) { 4179 return T->getStmtClass() == GenericSelectionExprClass; 4180 } 4181 static bool classof(const GenericSelectionExpr *) { return true; } 4182 4183 child_range children() { 4184 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4185 } 4186 4187 friend class ASTStmtReader; 4188}; 4189 4190//===----------------------------------------------------------------------===// 4191// Clang Extensions 4192//===----------------------------------------------------------------------===// 4193 4194 4195/// ExtVectorElementExpr - This represents access to specific elements of a 4196/// vector, and may occur on the left hand side or right hand side. For example 4197/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4198/// 4199/// Note that the base may have either vector or pointer to vector type, just 4200/// like a struct field reference. 4201/// 4202class ExtVectorElementExpr : public Expr { 4203 Stmt *Base; 4204 IdentifierInfo *Accessor; 4205 SourceLocation AccessorLoc; 4206public: 4207 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4208 IdentifierInfo &accessor, SourceLocation loc) 4209 : Expr(ExtVectorElementExprClass, ty, VK, 4210 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4211 base->isTypeDependent(), base->isValueDependent(), 4212 base->isInstantiationDependent(), 4213 base->containsUnexpandedParameterPack()), 4214 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4215 4216 /// \brief Build an empty vector element expression. 4217 explicit ExtVectorElementExpr(EmptyShell Empty) 4218 : Expr(ExtVectorElementExprClass, Empty) { } 4219 4220 const Expr *getBase() const { return cast<Expr>(Base); } 4221 Expr *getBase() { return cast<Expr>(Base); } 4222 void setBase(Expr *E) { Base = E; } 4223 4224 IdentifierInfo &getAccessor() const { return *Accessor; } 4225 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4226 4227 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4228 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4229 4230 /// getNumElements - Get the number of components being selected. 4231 unsigned getNumElements() const; 4232 4233 /// containsDuplicateElements - Return true if any element access is 4234 /// repeated. 4235 bool containsDuplicateElements() const; 4236 4237 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4238 /// aggregate Constant of ConstantInt(s). 4239 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4240 4241 SourceRange getSourceRange() const LLVM_READONLY { 4242 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4243 } 4244 4245 /// isArrow - Return true if the base expression is a pointer to vector, 4246 /// return false if the base expression is a vector. 4247 bool isArrow() const; 4248 4249 static bool classof(const Stmt *T) { 4250 return T->getStmtClass() == ExtVectorElementExprClass; 4251 } 4252 static bool classof(const ExtVectorElementExpr *) { return true; } 4253 4254 // Iterators 4255 child_range children() { return child_range(&Base, &Base+1); } 4256}; 4257 4258 4259/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4260/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4261class BlockExpr : public Expr { 4262protected: 4263 BlockDecl *TheBlock; 4264public: 4265 BlockExpr(BlockDecl *BD, QualType ty) 4266 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4267 ty->isDependentType(), ty->isDependentType(), 4268 ty->isInstantiationDependentType() || BD->isDependentContext(), 4269 false), 4270 TheBlock(BD) {} 4271 4272 /// \brief Build an empty block expression. 4273 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4274 4275 const BlockDecl *getBlockDecl() const { return TheBlock; } 4276 BlockDecl *getBlockDecl() { return TheBlock; } 4277 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4278 4279 // Convenience functions for probing the underlying BlockDecl. 4280 SourceLocation getCaretLocation() const; 4281 const Stmt *getBody() const; 4282 Stmt *getBody(); 4283 4284 SourceRange getSourceRange() const LLVM_READONLY { 4285 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4286 } 4287 4288 /// getFunctionType - Return the underlying function type for this block. 4289 const FunctionProtoType *getFunctionType() const; 4290 4291 static bool classof(const Stmt *T) { 4292 return T->getStmtClass() == BlockExprClass; 4293 } 4294 static bool classof(const BlockExpr *) { return true; } 4295 4296 // Iterators 4297 child_range children() { return child_range(); } 4298}; 4299 4300/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4301/// This AST node provides support for reinterpreting a type to another 4302/// type of the same size. 4303class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4304private: 4305 Stmt *SrcExpr; 4306 SourceLocation BuiltinLoc, RParenLoc; 4307 4308 friend class ASTReader; 4309 friend class ASTStmtReader; 4310 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4311 4312public: 4313 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4314 ExprValueKind VK, ExprObjectKind OK, 4315 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4316 : Expr(AsTypeExprClass, DstType, VK, OK, 4317 DstType->isDependentType(), 4318 DstType->isDependentType() || SrcExpr->isValueDependent(), 4319 (DstType->isInstantiationDependentType() || 4320 SrcExpr->isInstantiationDependent()), 4321 (DstType->containsUnexpandedParameterPack() || 4322 SrcExpr->containsUnexpandedParameterPack())), 4323 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4324 4325 /// getSrcExpr - Return the Expr to be converted. 4326 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4327 4328 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4329 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4330 4331 /// getRParenLoc - Return the location of final right parenthesis. 4332 SourceLocation getRParenLoc() const { return RParenLoc; } 4333 4334 SourceRange getSourceRange() const LLVM_READONLY { 4335 return SourceRange(BuiltinLoc, RParenLoc); 4336 } 4337 4338 static bool classof(const Stmt *T) { 4339 return T->getStmtClass() == AsTypeExprClass; 4340 } 4341 static bool classof(const AsTypeExpr *) { return true; } 4342 4343 // Iterators 4344 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4345}; 4346 4347/// PseudoObjectExpr - An expression which accesses a pseudo-object 4348/// l-value. A pseudo-object is an abstract object, accesses to which 4349/// are translated to calls. The pseudo-object expression has a 4350/// syntactic form, which shows how the expression was actually 4351/// written in the source code, and a semantic form, which is a series 4352/// of expressions to be executed in order which detail how the 4353/// operation is actually evaluated. Optionally, one of the semantic 4354/// forms may also provide a result value for the expression. 4355/// 4356/// If any of the semantic-form expressions is an OpaqueValueExpr, 4357/// that OVE is required to have a source expression, and it is bound 4358/// to the result of that source expression. Such OVEs may appear 4359/// only in subsequent semantic-form expressions and as 4360/// sub-expressions of the syntactic form. 4361/// 4362/// PseudoObjectExpr should be used only when an operation can be 4363/// usefully described in terms of fairly simple rewrite rules on 4364/// objects and functions that are meant to be used by end-developers. 4365/// For example, under the Itanium ABI, dynamic casts are implemented 4366/// as a call to a runtime function called __dynamic_cast; using this 4367/// class to describe that would be inappropriate because that call is 4368/// not really part of the user-visible semantics, and instead the 4369/// cast is properly reflected in the AST and IR-generation has been 4370/// taught to generate the call as necessary. In contrast, an 4371/// Objective-C property access is semantically defined to be 4372/// equivalent to a particular message send, and this is very much 4373/// part of the user model. The name of this class encourages this 4374/// modelling design. 4375class PseudoObjectExpr : public Expr { 4376 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4377 // Always at least two, because the first sub-expression is the 4378 // syntactic form. 4379 4380 // PseudoObjectExprBits.ResultIndex - The index of the 4381 // sub-expression holding the result. 0 means the result is void, 4382 // which is unambiguous because it's the index of the syntactic 4383 // form. Note that this is therefore 1 higher than the value passed 4384 // in to Create, which is an index within the semantic forms. 4385 // Note also that ASTStmtWriter assumes this encoding. 4386 4387 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); } 4388 const Expr * const *getSubExprsBuffer() const { 4389 return reinterpret_cast<const Expr * const *>(this + 1); 4390 } 4391 4392 friend class ASTStmtReader; 4393 4394 PseudoObjectExpr(QualType type, ExprValueKind VK, 4395 Expr *syntactic, ArrayRef<Expr*> semantic, 4396 unsigned resultIndex); 4397 4398 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4399 4400 unsigned getNumSubExprs() const { 4401 return PseudoObjectExprBits.NumSubExprs; 4402 } 4403 4404public: 4405 /// NoResult - A value for the result index indicating that there is 4406 /// no semantic result. 4407 enum { NoResult = ~0U }; 4408 4409 static PseudoObjectExpr *Create(ASTContext &Context, Expr *syntactic, 4410 ArrayRef<Expr*> semantic, 4411 unsigned resultIndex); 4412 4413 static PseudoObjectExpr *Create(ASTContext &Context, EmptyShell shell, 4414 unsigned numSemanticExprs); 4415 4416 /// Return the syntactic form of this expression, i.e. the 4417 /// expression it actually looks like. Likely to be expressed in 4418 /// terms of OpaqueValueExprs bound in the semantic form. 4419 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 4420 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 4421 4422 /// Return the index of the result-bearing expression into the semantics 4423 /// expressions, or PseudoObjectExpr::NoResult if there is none. 4424 unsigned getResultExprIndex() const { 4425 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 4426 return PseudoObjectExprBits.ResultIndex - 1; 4427 } 4428 4429 /// Return the result-bearing expression, or null if there is none. 4430 Expr *getResultExpr() { 4431 if (PseudoObjectExprBits.ResultIndex == 0) 4432 return 0; 4433 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 4434 } 4435 const Expr *getResultExpr() const { 4436 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 4437 } 4438 4439 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 4440 4441 typedef Expr * const *semantics_iterator; 4442 typedef const Expr * const *const_semantics_iterator; 4443 semantics_iterator semantics_begin() { 4444 return getSubExprsBuffer() + 1; 4445 } 4446 const_semantics_iterator semantics_begin() const { 4447 return getSubExprsBuffer() + 1; 4448 } 4449 semantics_iterator semantics_end() { 4450 return getSubExprsBuffer() + getNumSubExprs(); 4451 } 4452 const_semantics_iterator semantics_end() const { 4453 return getSubExprsBuffer() + getNumSubExprs(); 4454 } 4455 Expr *getSemanticExpr(unsigned index) { 4456 assert(index + 1 < getNumSubExprs()); 4457 return getSubExprsBuffer()[index + 1]; 4458 } 4459 const Expr *getSemanticExpr(unsigned index) const { 4460 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 4461 } 4462 4463 SourceLocation getExprLoc() const LLVM_READONLY { 4464 return getSyntacticForm()->getExprLoc(); 4465 } 4466 SourceRange getSourceRange() const LLVM_READONLY { 4467 return getSyntacticForm()->getSourceRange(); 4468 } 4469 4470 child_range children() { 4471 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer()); 4472 return child_range(cs, cs + getNumSubExprs()); 4473 } 4474 4475 static bool classof(const Stmt *T) { 4476 return T->getStmtClass() == PseudoObjectExprClass; 4477 } 4478 static bool classof(const PseudoObjectExpr *) { return true; } 4479}; 4480 4481/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4482/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4483/// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>. 4484/// All of these instructions take one primary pointer and at least one memory 4485/// order. 4486class AtomicExpr : public Expr { 4487public: 4488 enum AtomicOp { 4489#define BUILTIN(ID, TYPE, ATTRS) 4490#define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID, 4491#include "clang/Basic/Builtins.def" 4492 // Avoid trailing comma 4493 BI_First = 0 4494 }; 4495 4496private: 4497 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR }; 4498 Stmt* SubExprs[END_EXPR]; 4499 unsigned NumSubExprs; 4500 SourceLocation BuiltinLoc, RParenLoc; 4501 AtomicOp Op; 4502 4503 friend class ASTStmtReader; 4504 4505public: 4506 AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, QualType t, 4507 AtomicOp op, SourceLocation RP); 4508 4509 /// \brief Determine the number of arguments the specified atomic builtin 4510 /// should have. 4511 static unsigned getNumSubExprs(AtomicOp Op); 4512 4513 /// \brief Build an empty AtomicExpr. 4514 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4515 4516 Expr *getPtr() const { 4517 return cast<Expr>(SubExprs[PTR]); 4518 } 4519 Expr *getOrder() const { 4520 return cast<Expr>(SubExprs[ORDER]); 4521 } 4522 Expr *getVal1() const { 4523 if (Op == AO__c11_atomic_init) 4524 return cast<Expr>(SubExprs[ORDER]); 4525 assert(NumSubExprs > VAL1); 4526 return cast<Expr>(SubExprs[VAL1]); 4527 } 4528 Expr *getOrderFail() const { 4529 assert(NumSubExprs > ORDER_FAIL); 4530 return cast<Expr>(SubExprs[ORDER_FAIL]); 4531 } 4532 Expr *getVal2() const { 4533 if (Op == AO__atomic_exchange) 4534 return cast<Expr>(SubExprs[ORDER_FAIL]); 4535 assert(NumSubExprs > VAL2); 4536 return cast<Expr>(SubExprs[VAL2]); 4537 } 4538 Expr *getWeak() const { 4539 assert(NumSubExprs > WEAK); 4540 return cast<Expr>(SubExprs[WEAK]); 4541 } 4542 4543 AtomicOp getOp() const { return Op; } 4544 unsigned getNumSubExprs() { return NumSubExprs; } 4545 4546 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4547 4548 bool isVolatile() const { 4549 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4550 } 4551 4552 bool isCmpXChg() const { 4553 return getOp() == AO__c11_atomic_compare_exchange_strong || 4554 getOp() == AO__c11_atomic_compare_exchange_weak || 4555 getOp() == AO__atomic_compare_exchange || 4556 getOp() == AO__atomic_compare_exchange_n; 4557 } 4558 4559 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4560 SourceLocation getRParenLoc() const { return RParenLoc; } 4561 4562 SourceRange getSourceRange() const LLVM_READONLY { 4563 return SourceRange(BuiltinLoc, RParenLoc); 4564 } 4565 static bool classof(const Stmt *T) { 4566 return T->getStmtClass() == AtomicExprClass; 4567 } 4568 static bool classof(const AtomicExpr *) { return true; } 4569 4570 // Iterators 4571 child_range children() { 4572 return child_range(SubExprs, SubExprs+NumSubExprs); 4573 } 4574}; 4575} // end namespace clang 4576 4577#endif 4578