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/ASTVector.h" 19 #include "clang/AST/Decl.h" 20 #include "clang/AST/DeclAccessPair.h" 21 #include "clang/AST/OperationKinds.h" 22 #include "clang/AST/Stmt.h" 23 #include "clang/AST/TemplateBase.h" 24 #include "clang/AST/Type.h" 25 #include "clang/Basic/CharInfo.h" 26 #include "clang/Basic/TypeTraits.h" 27 #include "llvm/ADT/APFloat.h" 28 #include "llvm/ADT/APSInt.h" 29 #include "llvm/ADT/SmallVector.h" 30 #include "llvm/ADT/StringRef.h" 31 #include "llvm/Support/Compiler.h" 32 33 namespace clang { 34 class APValue; 35 class ASTContext; 36 class BlockDecl; 37 class CXXBaseSpecifier; 38 class CXXMemberCallExpr; 39 class CXXOperatorCallExpr; 40 class CastExpr; 41 class Decl; 42 class IdentifierInfo; 43 class MaterializeTemporaryExpr; 44 class NamedDecl; 45 class ObjCPropertyRefExpr; 46 class OpaqueValueExpr; 47 class ParmVarDecl; 48 class StringLiteral; 49 class TargetInfo; 50 class ValueDecl; 51 52 /// \brief A simple array of base specifiers. 53 typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 54 55 /// \brief An adjustment to be made to the temporary created when emitting a 56 /// reference binding, which accesses a particular subobject of that temporary. 57 struct SubobjectAdjustment { 58 enum { 59 DerivedToBaseAdjustment, 60 FieldAdjustment, 61 MemberPointerAdjustment 62 } Kind; 63 64 65 struct DTB { 66 const CastExpr *BasePath; 67 const CXXRecordDecl *DerivedClass; 68 }; 69 70 struct P { 71 const MemberPointerType *MPT; 72 Expr *RHS; 73 }; 74 75 union { 76 struct DTB DerivedToBase; 77 FieldDecl *Field; 78 struct P Ptr; 79 }; 80 81 SubobjectAdjustment(const CastExpr *BasePath, 82 const CXXRecordDecl *DerivedClass) 83 : Kind(DerivedToBaseAdjustment) { 84 DerivedToBase.BasePath = BasePath; 85 DerivedToBase.DerivedClass = DerivedClass; 86 } 87 88 SubobjectAdjustment(FieldDecl *Field) 89 : Kind(FieldAdjustment) { 90 this->Field = Field; 91 } 92 93 SubobjectAdjustment(const MemberPointerType *MPT, Expr *RHS) 94 : Kind(MemberPointerAdjustment) { 95 this->Ptr.MPT = MPT; 96 this->Ptr.RHS = RHS; 97 } 98 }; 99 100 /// Expr - This represents one expression. Note that Expr's are subclasses of 101 /// Stmt. This allows an expression to be transparently used any place a Stmt 102 /// is required. 103 /// 104 class Expr : public Stmt { 105 QualType TR; 106 107 protected: 108 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 109 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 110 : Stmt(SC) 111 { 112 ExprBits.TypeDependent = TD; 113 ExprBits.ValueDependent = VD; 114 ExprBits.InstantiationDependent = ID; 115 ExprBits.ValueKind = VK; 116 ExprBits.ObjectKind = OK; 117 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 118 setType(T); 119 } 120 121 /// \brief Construct an empty expression. 122 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 123 124 public: 125 QualType getType() const { return TR; } 126 void setType(QualType t) { 127 // In C++, the type of an expression is always adjusted so that it 128 // will not have reference type (C++ [expr]p6). Use 129 // QualType::getNonReferenceType() to retrieve the non-reference 130 // type. Additionally, inspect Expr::isLvalue to determine whether 131 // an expression that is adjusted in this manner should be 132 // considered an lvalue. 133 assert((t.isNull() || !t->isReferenceType()) && 134 "Expressions can't have reference type"); 135 136 TR = t; 137 } 138 139 /// isValueDependent - Determines whether this expression is 140 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 141 /// array bound of "Chars" in the following example is 142 /// value-dependent. 143 /// @code 144 /// template<int Size, char (&Chars)[Size]> struct meta_string; 145 /// @endcode 146 bool isValueDependent() const { return ExprBits.ValueDependent; } 147 148 /// \brief Set whether this expression is value-dependent or not. 149 void setValueDependent(bool VD) { 150 ExprBits.ValueDependent = VD; 151 if (VD) 152 ExprBits.InstantiationDependent = true; 153 } 154 155 /// isTypeDependent - Determines whether this expression is 156 /// type-dependent (C++ [temp.dep.expr]), which means that its type 157 /// could change from one template instantiation to the next. For 158 /// example, the expressions "x" and "x + y" are type-dependent in 159 /// the following code, but "y" is not type-dependent: 160 /// @code 161 /// template<typename T> 162 /// void add(T x, int y) { 163 /// x + y; 164 /// } 165 /// @endcode 166 bool isTypeDependent() const { return ExprBits.TypeDependent; } 167 168 /// \brief Set whether this expression is type-dependent or not. 169 void setTypeDependent(bool TD) { 170 ExprBits.TypeDependent = TD; 171 if (TD) 172 ExprBits.InstantiationDependent = true; 173 } 174 175 /// \brief Whether this expression is instantiation-dependent, meaning that 176 /// it depends in some way on a template parameter, even if neither its type 177 /// nor (constant) value can change due to the template instantiation. 178 /// 179 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 180 /// instantiation-dependent (since it involves a template parameter \c T), but 181 /// is neither type- nor value-dependent, since the type of the inner 182 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 183 /// \c sizeof is known. 184 /// 185 /// \code 186 /// template<typename T> 187 /// void f(T x, T y) { 188 /// sizeof(sizeof(T() + T()); 189 /// } 190 /// \endcode 191 /// 192 bool isInstantiationDependent() const { 193 return ExprBits.InstantiationDependent; 194 } 195 196 /// \brief Set whether this expression is instantiation-dependent or not. 197 void setInstantiationDependent(bool ID) { 198 ExprBits.InstantiationDependent = ID; 199 } 200 201 /// \brief Whether this expression contains an unexpanded parameter 202 /// pack (for C++11 variadic templates). 203 /// 204 /// Given the following function template: 205 /// 206 /// \code 207 /// template<typename F, typename ...Types> 208 /// void forward(const F &f, Types &&...args) { 209 /// f(static_cast<Types&&>(args)...); 210 /// } 211 /// \endcode 212 /// 213 /// The expressions \c args and \c static_cast<Types&&>(args) both 214 /// contain parameter packs. 215 bool containsUnexpandedParameterPack() const { 216 return ExprBits.ContainsUnexpandedParameterPack; 217 } 218 219 /// \brief Set the bit that describes whether this expression 220 /// contains an unexpanded parameter pack. 221 void setContainsUnexpandedParameterPack(bool PP = true) { 222 ExprBits.ContainsUnexpandedParameterPack = PP; 223 } 224 225 /// getExprLoc - Return the preferred location for the arrow when diagnosing 226 /// a problem with a generic expression. 227 SourceLocation getExprLoc() const LLVM_READONLY; 228 229 /// isUnusedResultAWarning - Return true if this immediate expression should 230 /// be warned about if the result is unused. If so, fill in expr, location, 231 /// and ranges with expr to warn on and source locations/ranges appropriate 232 /// for a warning. 233 bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc, 234 SourceRange &R1, SourceRange &R2, 235 ASTContext &Ctx) const; 236 237 /// isLValue - True if this expression is an "l-value" according to 238 /// the rules of the current language. C and C++ give somewhat 239 /// different rules for this concept, but in general, the result of 240 /// an l-value expression identifies a specific object whereas the 241 /// result of an r-value expression is a value detached from any 242 /// specific storage. 243 /// 244 /// C++11 divides the concept of "r-value" into pure r-values 245 /// ("pr-values") and so-called expiring values ("x-values"), which 246 /// identify specific objects that can be safely cannibalized for 247 /// their resources. This is an unfortunate abuse of terminology on 248 /// the part of the C++ committee. In Clang, when we say "r-value", 249 /// we generally mean a pr-value. 250 bool isLValue() const { return getValueKind() == VK_LValue; } 251 bool isRValue() const { return getValueKind() == VK_RValue; } 252 bool isXValue() const { return getValueKind() == VK_XValue; } 253 bool isGLValue() const { return getValueKind() != VK_RValue; } 254 255 enum LValueClassification { 256 LV_Valid, 257 LV_NotObjectType, 258 LV_IncompleteVoidType, 259 LV_DuplicateVectorComponents, 260 LV_InvalidExpression, 261 LV_InvalidMessageExpression, 262 LV_MemberFunction, 263 LV_SubObjCPropertySetting, 264 LV_ClassTemporary, 265 LV_ArrayTemporary 266 }; 267 /// Reasons why an expression might not be an l-value. 268 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 269 270 enum isModifiableLvalueResult { 271 MLV_Valid, 272 MLV_NotObjectType, 273 MLV_IncompleteVoidType, 274 MLV_DuplicateVectorComponents, 275 MLV_InvalidExpression, 276 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 277 MLV_IncompleteType, 278 MLV_ConstQualified, 279 MLV_ArrayType, 280 MLV_NoSetterProperty, 281 MLV_MemberFunction, 282 MLV_SubObjCPropertySetting, 283 MLV_InvalidMessageExpression, 284 MLV_ClassTemporary, 285 MLV_ArrayTemporary 286 }; 287 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 288 /// does not have an incomplete type, does not have a const-qualified type, 289 /// and if it is a structure or union, does not have any member (including, 290 /// recursively, any member or element of all contained aggregates or unions) 291 /// with a const-qualified type. 292 /// 293 /// \param Loc [in,out] - A source location which *may* be filled 294 /// in with the location of the expression making this a 295 /// non-modifiable lvalue, if specified. 296 isModifiableLvalueResult 297 isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc = nullptr) const; 298 299 /// \brief The return type of classify(). Represents the C++11 expression 300 /// taxonomy. 301 class Classification { 302 public: 303 /// \brief The various classification results. Most of these mean prvalue. 304 enum Kinds { 305 CL_LValue, 306 CL_XValue, 307 CL_Function, // Functions cannot be lvalues in C. 308 CL_Void, // Void cannot be an lvalue in C. 309 CL_AddressableVoid, // Void expression whose address can be taken in C. 310 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 311 CL_MemberFunction, // An expression referring to a member function 312 CL_SubObjCPropertySetting, 313 CL_ClassTemporary, // A temporary of class type, or subobject thereof. 314 CL_ArrayTemporary, // A temporary of array type. 315 CL_ObjCMessageRValue, // ObjC message is an rvalue 316 CL_PRValue // A prvalue for any other reason, of any other type 317 }; 318 /// \brief The results of modification testing. 319 enum ModifiableType { 320 CM_Untested, // testModifiable was false. 321 CM_Modifiable, 322 CM_RValue, // Not modifiable because it's an rvalue 323 CM_Function, // Not modifiable because it's a function; C++ only 324 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 325 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 326 CM_ConstQualified, 327 CM_ArrayType, 328 CM_IncompleteType 329 }; 330 331 private: 332 friend class Expr; 333 334 unsigned short Kind; 335 unsigned short Modifiable; 336 337 explicit Classification(Kinds k, ModifiableType m) 338 : Kind(k), Modifiable(m) 339 {} 340 341 public: 342 Classification() {} 343 344 Kinds getKind() const { return static_cast<Kinds>(Kind); } 345 ModifiableType getModifiable() const { 346 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 347 return static_cast<ModifiableType>(Modifiable); 348 } 349 bool isLValue() const { return Kind == CL_LValue; } 350 bool isXValue() const { return Kind == CL_XValue; } 351 bool isGLValue() const { return Kind <= CL_XValue; } 352 bool isPRValue() const { return Kind >= CL_Function; } 353 bool isRValue() const { return Kind >= CL_XValue; } 354 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 355 356 /// \brief Create a simple, modifiably lvalue 357 static Classification makeSimpleLValue() { 358 return Classification(CL_LValue, CM_Modifiable); 359 } 360 361 }; 362 /// \brief Classify - Classify this expression according to the C++11 363 /// expression taxonomy. 364 /// 365 /// C++11 defines ([basic.lval]) a new taxonomy of expressions to replace the 366 /// old lvalue vs rvalue. This function determines the type of expression this 367 /// is. There are three expression types: 368 /// - lvalues are classical lvalues as in C++03. 369 /// - prvalues are equivalent to rvalues in C++03. 370 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 371 /// function returning an rvalue reference. 372 /// lvalues and xvalues are collectively referred to as glvalues, while 373 /// prvalues and xvalues together form rvalues. 374 Classification Classify(ASTContext &Ctx) const { 375 return ClassifyImpl(Ctx, nullptr); 376 } 377 378 /// \brief ClassifyModifiable - Classify this expression according to the 379 /// C++11 expression taxonomy, and see if it is valid on the left side 380 /// of an assignment. 381 /// 382 /// This function extends classify in that it also tests whether the 383 /// expression is modifiable (C99 6.3.2.1p1). 384 /// \param Loc A source location that might be filled with a relevant location 385 /// if the expression is not modifiable. 386 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 387 return ClassifyImpl(Ctx, &Loc); 388 } 389 390 /// getValueKindForType - Given a formal return or parameter type, 391 /// give its value kind. 392 static ExprValueKind getValueKindForType(QualType T) { 393 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 394 return (isa<LValueReferenceType>(RT) 395 ? VK_LValue 396 : (RT->getPointeeType()->isFunctionType() 397 ? VK_LValue : VK_XValue)); 398 return VK_RValue; 399 } 400 401 /// getValueKind - The value kind that this expression produces. 402 ExprValueKind getValueKind() const { 403 return static_cast<ExprValueKind>(ExprBits.ValueKind); 404 } 405 406 /// getObjectKind - The object kind that this expression produces. 407 /// Object kinds are meaningful only for expressions that yield an 408 /// l-value or x-value. 409 ExprObjectKind getObjectKind() const { 410 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 411 } 412 413 bool isOrdinaryOrBitFieldObject() const { 414 ExprObjectKind OK = getObjectKind(); 415 return (OK == OK_Ordinary || OK == OK_BitField); 416 } 417 418 /// setValueKind - Set the value kind produced by this expression. 419 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 420 421 /// setObjectKind - Set the object kind produced by this expression. 422 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 423 424 private: 425 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 426 427 public: 428 429 /// \brief Returns true if this expression is a gl-value that 430 /// potentially refers to a bit-field. 431 /// 432 /// In C++, whether a gl-value refers to a bitfield is essentially 433 /// an aspect of the value-kind type system. 434 bool refersToBitField() const { return getObjectKind() == OK_BitField; } 435 436 /// \brief If this expression refers to a bit-field, retrieve the 437 /// declaration of that bit-field. 438 /// 439 /// Note that this returns a non-null pointer in subtly different 440 /// places than refersToBitField returns true. In particular, this can 441 /// return a non-null pointer even for r-values loaded from 442 /// bit-fields, but it will return null for a conditional bit-field. 443 FieldDecl *getSourceBitField(); 444 445 const FieldDecl *getSourceBitField() const { 446 return const_cast<Expr*>(this)->getSourceBitField(); 447 } 448 449 /// \brief If this expression is an l-value for an Objective C 450 /// property, find the underlying property reference expression. 451 const ObjCPropertyRefExpr *getObjCProperty() const; 452 453 /// \brief Check if this expression is the ObjC 'self' implicit parameter. 454 bool isObjCSelfExpr() const; 455 456 /// \brief Returns whether this expression refers to a vector element. 457 bool refersToVectorElement() const; 458 459 /// \brief Returns whether this expression has a placeholder type. 460 bool hasPlaceholderType() const { 461 return getType()->isPlaceholderType(); 462 } 463 464 /// \brief Returns whether this expression has a specific placeholder type. 465 bool hasPlaceholderType(BuiltinType::Kind K) const { 466 assert(BuiltinType::isPlaceholderTypeKind(K)); 467 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 468 return BT->getKind() == K; 469 return false; 470 } 471 472 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 473 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 474 /// but also int expressions which are produced by things like comparisons in 475 /// C. 476 bool isKnownToHaveBooleanValue() const; 477 478 /// isIntegerConstantExpr - Return true if this expression is a valid integer 479 /// constant expression, and, if so, return its value in Result. If not a 480 /// valid i-c-e, return false and fill in Loc (if specified) with the location 481 /// of the invalid expression. 482 /// 483 /// Note: This does not perform the implicit conversions required by C++11 484 /// [expr.const]p5. 485 bool isIntegerConstantExpr(llvm::APSInt &Result, const ASTContext &Ctx, 486 SourceLocation *Loc = nullptr, 487 bool isEvaluated = true) const; 488 bool isIntegerConstantExpr(const ASTContext &Ctx, 489 SourceLocation *Loc = nullptr) const; 490 491 /// isCXX98IntegralConstantExpr - Return true if this expression is an 492 /// integral constant expression in C++98. Can only be used in C++. 493 bool isCXX98IntegralConstantExpr(const ASTContext &Ctx) const; 494 495 /// isCXX11ConstantExpr - Return true if this expression is a constant 496 /// expression in C++11. Can only be used in C++. 497 /// 498 /// Note: This does not perform the implicit conversions required by C++11 499 /// [expr.const]p5. 500 bool isCXX11ConstantExpr(const ASTContext &Ctx, APValue *Result = nullptr, 501 SourceLocation *Loc = nullptr) const; 502 503 /// isPotentialConstantExpr - Return true if this function's definition 504 /// might be usable in a constant expression in C++11, if it were marked 505 /// constexpr. Return false if the function can never produce a constant 506 /// expression, along with diagnostics describing why not. 507 static bool isPotentialConstantExpr(const FunctionDecl *FD, 508 SmallVectorImpl< 509 PartialDiagnosticAt> &Diags); 510 511 /// isPotentialConstantExprUnevaluted - Return true if this expression might 512 /// be usable in a constant expression in C++11 in an unevaluated context, if 513 /// it were in function FD marked constexpr. Return false if the function can 514 /// never produce a constant expression, along with diagnostics describing 515 /// why not. 516 static bool isPotentialConstantExprUnevaluated(Expr *E, 517 const FunctionDecl *FD, 518 SmallVectorImpl< 519 PartialDiagnosticAt> &Diags); 520 521 /// isConstantInitializer - Returns true if this expression can be emitted to 522 /// IR as a constant, and thus can be used as a constant initializer in C. 523 /// If this expression is not constant and Culprit is non-null, 524 /// it is used to store the address of first non constant expr. 525 bool isConstantInitializer(ASTContext &Ctx, bool ForRef, 526 const Expr **Culprit = nullptr) const; 527 528 /// EvalStatus is a struct with detailed info about an evaluation in progress. 529 struct EvalStatus { 530 /// HasSideEffects - Whether the evaluated expression has side effects. 531 /// For example, (f() && 0) can be folded, but it still has side effects. 532 bool HasSideEffects; 533 534 /// Diag - If this is non-null, it will be filled in with a stack of notes 535 /// indicating why evaluation failed (or why it failed to produce a constant 536 /// expression). 537 /// If the expression is unfoldable, the notes will indicate why it's not 538 /// foldable. If the expression is foldable, but not a constant expression, 539 /// the notes will describes why it isn't a constant expression. If the 540 /// expression *is* a constant expression, no notes will be produced. 541 SmallVectorImpl<PartialDiagnosticAt> *Diag; 542 543 EvalStatus() : HasSideEffects(false), Diag(nullptr) {} 544 545 // hasSideEffects - Return true if the evaluated expression has 546 // side effects. 547 bool hasSideEffects() const { 548 return HasSideEffects; 549 } 550 }; 551 552 /// EvalResult is a struct with detailed info about an evaluated expression. 553 struct EvalResult : EvalStatus { 554 /// Val - This is the value the expression can be folded to. 555 APValue Val; 556 557 // isGlobalLValue - Return true if the evaluated lvalue expression 558 // is global. 559 bool isGlobalLValue() const; 560 }; 561 562 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 563 /// an rvalue using any crazy technique (that has nothing to do with language 564 /// standards) that we want to, even if the expression has side-effects. If 565 /// this function returns true, it returns the folded constant in Result. If 566 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 567 /// applied. 568 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 569 570 /// EvaluateAsBooleanCondition - Return true if this is a constant 571 /// which we we can fold and convert to a boolean condition using 572 /// any crazy technique that we want to, even if the expression has 573 /// side-effects. 574 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 575 576 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects }; 577 578 /// EvaluateAsInt - Return true if this is a constant which we can fold and 579 /// convert to an integer, using any crazy technique that we want to. 580 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 581 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 582 583 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 584 /// constant folded without side-effects, but discard the result. 585 bool isEvaluatable(const ASTContext &Ctx) const; 586 587 /// HasSideEffects - This routine returns true for all those expressions 588 /// which have any effect other than producing a value. Example is a function 589 /// call, volatile variable read, or throwing an exception. If 590 /// IncludePossibleEffects is false, this call treats certain expressions with 591 /// potential side effects (such as function call-like expressions, 592 /// instantiation-dependent expressions, or invocations from a macro) as not 593 /// having side effects. 594 bool HasSideEffects(const ASTContext &Ctx, 595 bool IncludePossibleEffects = true) const; 596 597 /// \brief Determine whether this expression involves a call to any function 598 /// that is not trivial. 599 bool hasNonTrivialCall(ASTContext &Ctx); 600 601 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 602 /// integer. This must be called on an expression that constant folds to an 603 /// integer. 604 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx, 605 SmallVectorImpl<PartialDiagnosticAt> *Diag = nullptr) const; 606 607 void EvaluateForOverflow(const ASTContext &Ctx) const; 608 609 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 610 /// lvalue with link time known address, with no side-effects. 611 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 612 613 /// EvaluateAsInitializer - Evaluate an expression as if it were the 614 /// initializer of the given declaration. Returns true if the initializer 615 /// can be folded to a constant, and produces any relevant notes. In C++11, 616 /// notes will be produced if the expression is not a constant expression. 617 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 618 const VarDecl *VD, 619 SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 620 621 /// EvaluateWithSubstitution - Evaluate an expression as if from the context 622 /// of a call to the given function with the given arguments, inside an 623 /// unevaluated context. Returns true if the expression could be folded to a 624 /// constant. 625 bool EvaluateWithSubstitution(APValue &Value, ASTContext &Ctx, 626 const FunctionDecl *Callee, 627 ArrayRef<const Expr*> Args) const; 628 629 /// \brief Enumeration used to describe the kind of Null pointer constant 630 /// returned from \c isNullPointerConstant(). 631 enum NullPointerConstantKind { 632 /// \brief Expression is not a Null pointer constant. 633 NPCK_NotNull = 0, 634 635 /// \brief Expression is a Null pointer constant built from a zero integer 636 /// expression that is not a simple, possibly parenthesized, zero literal. 637 /// C++ Core Issue 903 will classify these expressions as "not pointers" 638 /// once it is adopted. 639 /// http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#903 640 NPCK_ZeroExpression, 641 642 /// \brief Expression is a Null pointer constant built from a literal zero. 643 NPCK_ZeroLiteral, 644 645 /// \brief Expression is a C++11 nullptr. 646 NPCK_CXX11_nullptr, 647 648 /// \brief Expression is a GNU-style __null constant. 649 NPCK_GNUNull 650 }; 651 652 /// \brief Enumeration used to describe how \c isNullPointerConstant() 653 /// should cope with value-dependent expressions. 654 enum NullPointerConstantValueDependence { 655 /// \brief Specifies that the expression should never be value-dependent. 656 NPC_NeverValueDependent = 0, 657 658 /// \brief Specifies that a value-dependent expression of integral or 659 /// dependent type should be considered a null pointer constant. 660 NPC_ValueDependentIsNull, 661 662 /// \brief Specifies that a value-dependent expression should be considered 663 /// to never be a null pointer constant. 664 NPC_ValueDependentIsNotNull 665 }; 666 667 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 668 /// a Null pointer constant. The return value can further distinguish the 669 /// kind of NULL pointer constant that was detected. 670 NullPointerConstantKind isNullPointerConstant( 671 ASTContext &Ctx, 672 NullPointerConstantValueDependence NPC) const; 673 674 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 675 /// write barrier. 676 bool isOBJCGCCandidate(ASTContext &Ctx) const; 677 678 /// \brief Returns true if this expression is a bound member function. 679 bool isBoundMemberFunction(ASTContext &Ctx) const; 680 681 /// \brief Given an expression of bound-member type, find the type 682 /// of the member. Returns null if this is an *overloaded* bound 683 /// member expression. 684 static QualType findBoundMemberType(const Expr *expr); 685 686 /// IgnoreImpCasts - Skip past any implicit casts which might 687 /// surround this expression. Only skips ImplicitCastExprs. 688 Expr *IgnoreImpCasts() LLVM_READONLY; 689 690 /// IgnoreImplicit - Skip past any implicit AST nodes which might 691 /// surround this expression. 692 Expr *IgnoreImplicit() LLVM_READONLY { 693 return cast<Expr>(Stmt::IgnoreImplicit()); 694 } 695 696 const Expr *IgnoreImplicit() const LLVM_READONLY { 697 return const_cast<Expr*>(this)->IgnoreImplicit(); 698 } 699 700 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 701 /// its subexpression. If that subexpression is also a ParenExpr, 702 /// then this method recursively returns its subexpression, and so forth. 703 /// Otherwise, the method returns the current Expr. 704 Expr *IgnoreParens() LLVM_READONLY; 705 706 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 707 /// or CastExprs, returning their operand. 708 Expr *IgnoreParenCasts() LLVM_READONLY; 709 710 /// Ignore casts. Strip off any CastExprs, returning their operand. 711 Expr *IgnoreCasts() LLVM_READONLY; 712 713 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 714 /// any ParenExpr or ImplicitCastExprs, returning their operand. 715 Expr *IgnoreParenImpCasts() LLVM_READONLY; 716 717 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 718 /// call to a conversion operator, return the argument. 719 Expr *IgnoreConversionOperator() LLVM_READONLY; 720 721 const Expr *IgnoreConversionOperator() const LLVM_READONLY { 722 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 723 } 724 725 const Expr *IgnoreParenImpCasts() const LLVM_READONLY { 726 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 727 } 728 729 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 730 /// CastExprs that represent lvalue casts, returning their operand. 731 Expr *IgnoreParenLValueCasts() LLVM_READONLY; 732 733 const Expr *IgnoreParenLValueCasts() const LLVM_READONLY { 734 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 735 } 736 737 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 738 /// value (including ptr->int casts of the same size). Strip off any 739 /// ParenExpr or CastExprs, returning their operand. 740 Expr *IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY; 741 742 /// Ignore parentheses and derived-to-base casts. 743 Expr *ignoreParenBaseCasts() LLVM_READONLY; 744 745 const Expr *ignoreParenBaseCasts() const LLVM_READONLY { 746 return const_cast<Expr*>(this)->ignoreParenBaseCasts(); 747 } 748 749 /// \brief Determine whether this expression is a default function argument. 750 /// 751 /// Default arguments are implicitly generated in the abstract syntax tree 752 /// by semantic analysis for function calls, object constructions, etc. in 753 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 754 /// this routine also looks through any implicit casts to determine whether 755 /// the expression is a default argument. 756 bool isDefaultArgument() const; 757 758 /// \brief Determine whether the result of this expression is a 759 /// temporary object of the given class type. 760 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 761 762 /// \brief Whether this expression is an implicit reference to 'this' in C++. 763 bool isImplicitCXXThis() const; 764 765 const Expr *IgnoreImpCasts() const LLVM_READONLY { 766 return const_cast<Expr*>(this)->IgnoreImpCasts(); 767 } 768 const Expr *IgnoreParens() const LLVM_READONLY { 769 return const_cast<Expr*>(this)->IgnoreParens(); 770 } 771 const Expr *IgnoreParenCasts() const LLVM_READONLY { 772 return const_cast<Expr*>(this)->IgnoreParenCasts(); 773 } 774 /// Strip off casts, but keep parentheses. 775 const Expr *IgnoreCasts() const LLVM_READONLY { 776 return const_cast<Expr*>(this)->IgnoreCasts(); 777 } 778 779 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const LLVM_READONLY { 780 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 781 } 782 783 static bool hasAnyTypeDependentArguments(ArrayRef<Expr *> Exprs); 784 785 /// \brief For an expression of class type or pointer to class type, 786 /// return the most derived class decl the expression is known to refer to. 787 /// 788 /// If this expression is a cast, this method looks through it to find the 789 /// most derived decl that can be inferred from the expression. 790 /// This is valid because derived-to-base conversions have undefined 791 /// behavior if the object isn't dynamically of the derived type. 792 const CXXRecordDecl *getBestDynamicClassType() const; 793 794 /// Walk outwards from an expression we want to bind a reference to and 795 /// find the expression whose lifetime needs to be extended. Record 796 /// the LHSs of comma expressions and adjustments needed along the path. 797 const Expr *skipRValueSubobjectAdjustments( 798 SmallVectorImpl<const Expr *> &CommaLHS, 799 SmallVectorImpl<SubobjectAdjustment> &Adjustments) const; 800 801 static bool classof(const Stmt *T) { 802 return T->getStmtClass() >= firstExprConstant && 803 T->getStmtClass() <= lastExprConstant; 804 } 805 }; 806 807 808 //===----------------------------------------------------------------------===// 809 // Primary Expressions. 810 //===----------------------------------------------------------------------===// 811 812 /// OpaqueValueExpr - An expression referring to an opaque object of a 813 /// fixed type and value class. These don't correspond to concrete 814 /// syntax; instead they're used to express operations (usually copy 815 /// operations) on values whose source is generally obvious from 816 /// context. 817 class OpaqueValueExpr : public Expr { 818 friend class ASTStmtReader; 819 Expr *SourceExpr; 820 SourceLocation Loc; 821 822 public: 823 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 824 ExprObjectKind OK = OK_Ordinary, 825 Expr *SourceExpr = nullptr) 826 : Expr(OpaqueValueExprClass, T, VK, OK, 827 T->isDependentType(), 828 T->isDependentType() || 829 (SourceExpr && SourceExpr->isValueDependent()), 830 T->isInstantiationDependentType(), 831 false), 832 SourceExpr(SourceExpr), Loc(Loc) { 833 } 834 835 /// Given an expression which invokes a copy constructor --- i.e. a 836 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 837 /// find the OpaqueValueExpr that's the source of the construction. 838 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 839 840 explicit OpaqueValueExpr(EmptyShell Empty) 841 : Expr(OpaqueValueExprClass, Empty) { } 842 843 /// \brief Retrieve the location of this expression. 844 SourceLocation getLocation() const { return Loc; } 845 846 SourceLocation getLocStart() const LLVM_READONLY { 847 return SourceExpr ? SourceExpr->getLocStart() : Loc; 848 } 849 SourceLocation getLocEnd() const LLVM_READONLY { 850 return SourceExpr ? SourceExpr->getLocEnd() : Loc; 851 } 852 SourceLocation getExprLoc() const LLVM_READONLY { 853 if (SourceExpr) return SourceExpr->getExprLoc(); 854 return Loc; 855 } 856 857 child_range children() { return child_range(); } 858 859 /// The source expression of an opaque value expression is the 860 /// expression which originally generated the value. This is 861 /// provided as a convenience for analyses that don't wish to 862 /// precisely model the execution behavior of the program. 863 /// 864 /// The source expression is typically set when building the 865 /// expression which binds the opaque value expression in the first 866 /// place. 867 Expr *getSourceExpr() const { return SourceExpr; } 868 869 static bool classof(const Stmt *T) { 870 return T->getStmtClass() == OpaqueValueExprClass; 871 } 872 }; 873 874 /// \brief A reference to a declared variable, function, enum, etc. 875 /// [C99 6.5.1p2] 876 /// 877 /// This encodes all the information about how a declaration is referenced 878 /// within an expression. 879 /// 880 /// There are several optional constructs attached to DeclRefExprs only when 881 /// they apply in order to conserve memory. These are laid out past the end of 882 /// the object, and flags in the DeclRefExprBitfield track whether they exist: 883 /// 884 /// DeclRefExprBits.HasQualifier: 885 /// Specifies when this declaration reference expression has a C++ 886 /// nested-name-specifier. 887 /// DeclRefExprBits.HasFoundDecl: 888 /// Specifies when this declaration reference expression has a record of 889 /// a NamedDecl (different from the referenced ValueDecl) which was found 890 /// during name lookup and/or overload resolution. 891 /// DeclRefExprBits.HasTemplateKWAndArgsInfo: 892 /// Specifies when this declaration reference expression has an explicit 893 /// C++ template keyword and/or template argument list. 894 /// DeclRefExprBits.RefersToEnclosingVariableOrCapture 895 /// Specifies when this declaration reference expression (validly) 896 /// refers to an enclosed local or a captured variable. 897 class DeclRefExpr : public Expr { 898 /// \brief The declaration that we are referencing. 899 ValueDecl *D; 900 901 /// \brief The location of the declaration name itself. 902 SourceLocation Loc; 903 904 /// \brief Provides source/type location info for the declaration name 905 /// embedded in D. 906 DeclarationNameLoc DNLoc; 907 908 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 909 NestedNameSpecifierLoc &getInternalQualifierLoc() { 910 assert(hasQualifier()); 911 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 912 } 913 914 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 915 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 916 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 917 } 918 919 /// \brief Test whether there is a distinct FoundDecl attached to the end of 920 /// this DRE. 921 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 922 923 /// \brief Helper to retrieve the optional NamedDecl through which this 924 /// reference occurred. 925 NamedDecl *&getInternalFoundDecl() { 926 assert(hasFoundDecl()); 927 if (hasQualifier()) 928 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 929 return *reinterpret_cast<NamedDecl **>(this + 1); 930 } 931 932 /// \brief Helper to retrieve the optional NamedDecl through which this 933 /// reference occurred. 934 NamedDecl *getInternalFoundDecl() const { 935 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 936 } 937 938 DeclRefExpr(const ASTContext &Ctx, 939 NestedNameSpecifierLoc QualifierLoc, 940 SourceLocation TemplateKWLoc, 941 ValueDecl *D, bool RefersToEnlosingVariableOrCapture, 942 const DeclarationNameInfo &NameInfo, 943 NamedDecl *FoundD, 944 const TemplateArgumentListInfo *TemplateArgs, 945 QualType T, ExprValueKind VK); 946 947 /// \brief Construct an empty declaration reference expression. 948 explicit DeclRefExpr(EmptyShell Empty) 949 : Expr(DeclRefExprClass, Empty) { } 950 951 /// \brief Computes the type- and value-dependence flags for this 952 /// declaration reference expression. 953 void computeDependence(const ASTContext &C); 954 955 public: 956 DeclRefExpr(ValueDecl *D, bool RefersToEnclosingVariableOrCapture, QualType T, 957 ExprValueKind VK, SourceLocation L, 958 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 959 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 960 D(D), Loc(L), DNLoc(LocInfo) { 961 DeclRefExprBits.HasQualifier = 0; 962 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 963 DeclRefExprBits.HasFoundDecl = 0; 964 DeclRefExprBits.HadMultipleCandidates = 0; 965 DeclRefExprBits.RefersToEnclosingVariableOrCapture = 966 RefersToEnclosingVariableOrCapture; 967 computeDependence(D->getASTContext()); 968 } 969 970 static DeclRefExpr * 971 Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc, 972 SourceLocation TemplateKWLoc, ValueDecl *D, 973 bool RefersToEnclosingVariableOrCapture, SourceLocation NameLoc, 974 QualType T, ExprValueKind VK, NamedDecl *FoundD = nullptr, 975 const TemplateArgumentListInfo *TemplateArgs = nullptr); 976 977 static DeclRefExpr * 978 Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc, 979 SourceLocation TemplateKWLoc, ValueDecl *D, 980 bool RefersToEnclosingVariableOrCapture, 981 const DeclarationNameInfo &NameInfo, QualType T, ExprValueKind VK, 982 NamedDecl *FoundD = nullptr, 983 const TemplateArgumentListInfo *TemplateArgs = nullptr); 984 985 /// \brief Construct an empty declaration reference expression. 986 static DeclRefExpr *CreateEmpty(const ASTContext &Context, 987 bool HasQualifier, 988 bool HasFoundDecl, 989 bool HasTemplateKWAndArgsInfo, 990 unsigned NumTemplateArgs); 991 992 ValueDecl *getDecl() { return D; } 993 const ValueDecl *getDecl() const { return D; } 994 void setDecl(ValueDecl *NewD) { D = NewD; } 995 996 DeclarationNameInfo getNameInfo() const { 997 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 998 } 999 1000 SourceLocation getLocation() const { return Loc; } 1001 void setLocation(SourceLocation L) { Loc = L; } 1002 SourceLocation getLocStart() const LLVM_READONLY; 1003 SourceLocation getLocEnd() const LLVM_READONLY; 1004 1005 /// \brief Determine whether this declaration reference was preceded by a 1006 /// C++ nested-name-specifier, e.g., \c N::foo. 1007 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 1008 1009 /// \brief If the name was qualified, retrieves the nested-name-specifier 1010 /// that precedes the name. Otherwise, returns NULL. 1011 NestedNameSpecifier *getQualifier() const { 1012 if (!hasQualifier()) 1013 return nullptr; 1014 1015 return getInternalQualifierLoc().getNestedNameSpecifier(); 1016 } 1017 1018 /// \brief If the name was qualified, retrieves the nested-name-specifier 1019 /// that precedes the name, with source-location information. 1020 NestedNameSpecifierLoc getQualifierLoc() const { 1021 if (!hasQualifier()) 1022 return NestedNameSpecifierLoc(); 1023 1024 return getInternalQualifierLoc(); 1025 } 1026 1027 /// \brief Get the NamedDecl through which this reference occurred. 1028 /// 1029 /// This Decl may be different from the ValueDecl actually referred to in the 1030 /// presence of using declarations, etc. It always returns non-NULL, and may 1031 /// simple return the ValueDecl when appropriate. 1032 NamedDecl *getFoundDecl() { 1033 return hasFoundDecl() ? getInternalFoundDecl() : D; 1034 } 1035 1036 /// \brief Get the NamedDecl through which this reference occurred. 1037 /// See non-const variant. 1038 const NamedDecl *getFoundDecl() const { 1039 return hasFoundDecl() ? getInternalFoundDecl() : D; 1040 } 1041 1042 bool hasTemplateKWAndArgsInfo() const { 1043 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 1044 } 1045 1046 /// \brief Return the optional template keyword and arguments info. 1047 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 1048 if (!hasTemplateKWAndArgsInfo()) 1049 return nullptr; 1050 1051 if (hasFoundDecl()) 1052 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 1053 &getInternalFoundDecl() + 1); 1054 1055 if (hasQualifier()) 1056 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 1057 &getInternalQualifierLoc() + 1); 1058 1059 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 1060 } 1061 1062 /// \brief Return the optional template keyword and arguments info. 1063 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 1064 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo(); 1065 } 1066 1067 /// \brief Retrieve the location of the template keyword preceding 1068 /// this name, if any. 1069 SourceLocation getTemplateKeywordLoc() const { 1070 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1071 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 1072 } 1073 1074 /// \brief Retrieve the location of the left angle bracket starting the 1075 /// explicit template argument list following the name, if any. 1076 SourceLocation getLAngleLoc() const { 1077 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1078 return getTemplateKWAndArgsInfo()->LAngleLoc; 1079 } 1080 1081 /// \brief Retrieve the location of the right angle bracket ending the 1082 /// explicit template argument list following the name, if any. 1083 SourceLocation getRAngleLoc() const { 1084 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1085 return getTemplateKWAndArgsInfo()->RAngleLoc; 1086 } 1087 1088 /// \brief Determines whether the name in this declaration reference 1089 /// was preceded by the template keyword. 1090 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 1091 1092 /// \brief Determines whether this declaration reference was followed by an 1093 /// explicit template argument list. 1094 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 1095 1096 /// \brief Retrieve the explicit template argument list that followed the 1097 /// member template name. 1098 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 1099 assert(hasExplicitTemplateArgs()); 1100 return *getTemplateKWAndArgsInfo(); 1101 } 1102 1103 /// \brief Retrieve the explicit template argument list that followed the 1104 /// member template name. 1105 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 1106 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 1107 } 1108 1109 /// \brief Retrieves the optional explicit template arguments. 1110 /// This points to the same data as getExplicitTemplateArgs(), but 1111 /// returns null if there are no explicit template arguments. 1112 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 1113 if (!hasExplicitTemplateArgs()) return nullptr; 1114 return &getExplicitTemplateArgs(); 1115 } 1116 1117 /// \brief Copies the template arguments (if present) into the given 1118 /// structure. 1119 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1120 if (hasExplicitTemplateArgs()) 1121 getExplicitTemplateArgs().copyInto(List); 1122 } 1123 1124 /// \brief Retrieve the template arguments provided as part of this 1125 /// template-id. 1126 const TemplateArgumentLoc *getTemplateArgs() const { 1127 if (!hasExplicitTemplateArgs()) 1128 return nullptr; 1129 1130 return getExplicitTemplateArgs().getTemplateArgs(); 1131 } 1132 1133 /// \brief Retrieve the number of template arguments provided as part of this 1134 /// template-id. 1135 unsigned getNumTemplateArgs() const { 1136 if (!hasExplicitTemplateArgs()) 1137 return 0; 1138 1139 return getExplicitTemplateArgs().NumTemplateArgs; 1140 } 1141 1142 /// \brief Returns true if this expression refers to a function that 1143 /// was resolved from an overloaded set having size greater than 1. 1144 bool hadMultipleCandidates() const { 1145 return DeclRefExprBits.HadMultipleCandidates; 1146 } 1147 /// \brief Sets the flag telling whether this expression refers to 1148 /// a function that was resolved from an overloaded set having size 1149 /// greater than 1. 1150 void setHadMultipleCandidates(bool V = true) { 1151 DeclRefExprBits.HadMultipleCandidates = V; 1152 } 1153 1154 /// \brief Does this DeclRefExpr refer to an enclosing local or a captured 1155 /// variable? 1156 bool refersToEnclosingVariableOrCapture() const { 1157 return DeclRefExprBits.RefersToEnclosingVariableOrCapture; 1158 } 1159 1160 static bool classof(const Stmt *T) { 1161 return T->getStmtClass() == DeclRefExprClass; 1162 } 1163 1164 // Iterators 1165 child_range children() { return child_range(); } 1166 1167 friend class ASTStmtReader; 1168 friend class ASTStmtWriter; 1169 }; 1170 1171 /// \brief [C99 6.4.2.2] - A predefined identifier such as __func__. 1172 class PredefinedExpr : public Expr { 1173 public: 1174 enum IdentType { 1175 Func, 1176 Function, 1177 LFunction, // Same as Function, but as wide string. 1178 FuncDName, 1179 FuncSig, 1180 PrettyFunction, 1181 /// \brief The same as PrettyFunction, except that the 1182 /// 'virtual' keyword is omitted for virtual member functions. 1183 PrettyFunctionNoVirtual 1184 }; 1185 1186 private: 1187 SourceLocation Loc; 1188 IdentType Type; 1189 Stmt *FnName; 1190 1191 public: 1192 PredefinedExpr(SourceLocation L, QualType FNTy, IdentType IT, 1193 StringLiteral *SL); 1194 1195 /// \brief Construct an empty predefined expression. 1196 explicit PredefinedExpr(EmptyShell Empty) 1197 : Expr(PredefinedExprClass, Empty), Loc(), Type(Func), FnName(nullptr) {} 1198 1199 IdentType getIdentType() const { return Type; } 1200 1201 SourceLocation getLocation() const { return Loc; } 1202 void setLocation(SourceLocation L) { Loc = L; } 1203 1204 StringLiteral *getFunctionName(); 1205 const StringLiteral *getFunctionName() const { 1206 return const_cast<PredefinedExpr *>(this)->getFunctionName(); 1207 } 1208 1209 static StringRef getIdentTypeName(IdentType IT); 1210 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1211 1212 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1213 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1214 1215 static bool classof(const Stmt *T) { 1216 return T->getStmtClass() == PredefinedExprClass; 1217 } 1218 1219 // Iterators 1220 child_range children() { return child_range(&FnName, &FnName + 1); } 1221 1222 friend class ASTStmtReader; 1223 }; 1224 1225 /// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1226 /// leaking memory. 1227 /// 1228 /// For large floats/integers, APFloat/APInt will allocate memory from the heap 1229 /// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1230 /// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1231 /// the APFloat/APInt values will never get freed. APNumericStorage uses 1232 /// ASTContext's allocator for memory allocation. 1233 class APNumericStorage { 1234 union { 1235 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1236 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1237 }; 1238 unsigned BitWidth; 1239 1240 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1241 1242 APNumericStorage(const APNumericStorage &) = delete; 1243 void operator=(const APNumericStorage &) = delete; 1244 1245 protected: 1246 APNumericStorage() : VAL(0), BitWidth(0) { } 1247 1248 llvm::APInt getIntValue() const { 1249 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1250 if (NumWords > 1) 1251 return llvm::APInt(BitWidth, NumWords, pVal); 1252 else 1253 return llvm::APInt(BitWidth, VAL); 1254 } 1255 void setIntValue(const ASTContext &C, const llvm::APInt &Val); 1256 }; 1257 1258 class APIntStorage : private APNumericStorage { 1259 public: 1260 llvm::APInt getValue() const { return getIntValue(); } 1261 void setValue(const ASTContext &C, const llvm::APInt &Val) { 1262 setIntValue(C, Val); 1263 } 1264 }; 1265 1266 class APFloatStorage : private APNumericStorage { 1267 public: 1268 llvm::APFloat getValue(const llvm::fltSemantics &Semantics) const { 1269 return llvm::APFloat(Semantics, getIntValue()); 1270 } 1271 void setValue(const ASTContext &C, const llvm::APFloat &Val) { 1272 setIntValue(C, Val.bitcastToAPInt()); 1273 } 1274 }; 1275 1276 class IntegerLiteral : public Expr, public APIntStorage { 1277 SourceLocation Loc; 1278 1279 /// \brief Construct an empty integer literal. 1280 explicit IntegerLiteral(EmptyShell Empty) 1281 : Expr(IntegerLiteralClass, Empty) { } 1282 1283 public: 1284 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1285 // or UnsignedLongLongTy 1286 IntegerLiteral(const ASTContext &C, const llvm::APInt &V, QualType type, 1287 SourceLocation l); 1288 1289 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1290 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1291 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1292 /// \param V - the value that the returned integer literal contains. 1293 static IntegerLiteral *Create(const ASTContext &C, const llvm::APInt &V, 1294 QualType type, SourceLocation l); 1295 /// \brief Returns a new empty integer literal. 1296 static IntegerLiteral *Create(const ASTContext &C, EmptyShell Empty); 1297 1298 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1299 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1300 1301 /// \brief Retrieve the location of the literal. 1302 SourceLocation getLocation() const { return Loc; } 1303 1304 void setLocation(SourceLocation Location) { Loc = Location; } 1305 1306 static bool classof(const Stmt *T) { 1307 return T->getStmtClass() == IntegerLiteralClass; 1308 } 1309 1310 // Iterators 1311 child_range children() { return child_range(); } 1312 }; 1313 1314 class CharacterLiteral : public Expr { 1315 public: 1316 enum CharacterKind { 1317 Ascii, 1318 Wide, 1319 UTF16, 1320 UTF32 1321 }; 1322 1323 private: 1324 unsigned Value; 1325 SourceLocation Loc; 1326 public: 1327 // type should be IntTy 1328 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1329 SourceLocation l) 1330 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1331 false, false), 1332 Value(value), Loc(l) { 1333 CharacterLiteralBits.Kind = kind; 1334 } 1335 1336 /// \brief Construct an empty character literal. 1337 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1338 1339 SourceLocation getLocation() const { return Loc; } 1340 CharacterKind getKind() const { 1341 return static_cast<CharacterKind>(CharacterLiteralBits.Kind); 1342 } 1343 1344 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1345 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1346 1347 unsigned getValue() const { return Value; } 1348 1349 void setLocation(SourceLocation Location) { Loc = Location; } 1350 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; } 1351 void setValue(unsigned Val) { Value = Val; } 1352 1353 static bool classof(const Stmt *T) { 1354 return T->getStmtClass() == CharacterLiteralClass; 1355 } 1356 1357 // Iterators 1358 child_range children() { return child_range(); } 1359 }; 1360 1361 class FloatingLiteral : public Expr, private APFloatStorage { 1362 SourceLocation Loc; 1363 1364 FloatingLiteral(const ASTContext &C, const llvm::APFloat &V, bool isexact, 1365 QualType Type, SourceLocation L); 1366 1367 /// \brief Construct an empty floating-point literal. 1368 explicit FloatingLiteral(const ASTContext &C, EmptyShell Empty); 1369 1370 public: 1371 static FloatingLiteral *Create(const ASTContext &C, const llvm::APFloat &V, 1372 bool isexact, QualType Type, SourceLocation L); 1373 static FloatingLiteral *Create(const ASTContext &C, EmptyShell Empty); 1374 1375 llvm::APFloat getValue() const { 1376 return APFloatStorage::getValue(getSemantics()); 1377 } 1378 void setValue(const ASTContext &C, const llvm::APFloat &Val) { 1379 assert(&getSemantics() == &Val.getSemantics() && "Inconsistent semantics"); 1380 APFloatStorage::setValue(C, Val); 1381 } 1382 1383 /// Get a raw enumeration value representing the floating-point semantics of 1384 /// this literal (32-bit IEEE, x87, ...), suitable for serialisation. 1385 APFloatSemantics getRawSemantics() const { 1386 return static_cast<APFloatSemantics>(FloatingLiteralBits.Semantics); 1387 } 1388 1389 /// Set the raw enumeration value representing the floating-point semantics of 1390 /// this literal (32-bit IEEE, x87, ...), suitable for serialisation. 1391 void setRawSemantics(APFloatSemantics Sem) { 1392 FloatingLiteralBits.Semantics = Sem; 1393 } 1394 1395 /// Return the APFloat semantics this literal uses. 1396 const llvm::fltSemantics &getSemantics() const; 1397 1398 /// Set the APFloat semantics this literal uses. 1399 void setSemantics(const llvm::fltSemantics &Sem); 1400 1401 bool isExact() const { return FloatingLiteralBits.IsExact; } 1402 void setExact(bool E) { FloatingLiteralBits.IsExact = E; } 1403 1404 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1405 /// double. Note that this may cause loss of precision, but is useful for 1406 /// debugging dumps, etc. 1407 double getValueAsApproximateDouble() const; 1408 1409 SourceLocation getLocation() const { return Loc; } 1410 void setLocation(SourceLocation L) { Loc = L; } 1411 1412 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1413 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1414 1415 static bool classof(const Stmt *T) { 1416 return T->getStmtClass() == FloatingLiteralClass; 1417 } 1418 1419 // Iterators 1420 child_range children() { return child_range(); } 1421 }; 1422 1423 /// ImaginaryLiteral - We support imaginary integer and floating point literals, 1424 /// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1425 /// IntegerLiteral classes. Instances of this class always have a Complex type 1426 /// whose element type matches the subexpression. 1427 /// 1428 class ImaginaryLiteral : public Expr { 1429 Stmt *Val; 1430 public: 1431 ImaginaryLiteral(Expr *val, QualType Ty) 1432 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1433 false, false), 1434 Val(val) {} 1435 1436 /// \brief Build an empty imaginary literal. 1437 explicit ImaginaryLiteral(EmptyShell Empty) 1438 : Expr(ImaginaryLiteralClass, Empty) { } 1439 1440 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1441 Expr *getSubExpr() { return cast<Expr>(Val); } 1442 void setSubExpr(Expr *E) { Val = E; } 1443 1444 SourceLocation getLocStart() const LLVM_READONLY { return Val->getLocStart(); } 1445 SourceLocation getLocEnd() const LLVM_READONLY { return Val->getLocEnd(); } 1446 1447 static bool classof(const Stmt *T) { 1448 return T->getStmtClass() == ImaginaryLiteralClass; 1449 } 1450 1451 // Iterators 1452 child_range children() { return child_range(&Val, &Val+1); } 1453 }; 1454 1455 /// StringLiteral - This represents a string literal expression, e.g. "foo" 1456 /// or L"bar" (wide strings). The actual string is returned by getBytes() 1457 /// is NOT null-terminated, and the length of the string is determined by 1458 /// calling getByteLength(). The C type for a string is always a 1459 /// ConstantArrayType. In C++, the char type is const qualified, in C it is 1460 /// not. 1461 /// 1462 /// Note that strings in C can be formed by concatenation of multiple string 1463 /// literal pptokens in translation phase #6. This keeps track of the locations 1464 /// of each of these pieces. 1465 /// 1466 /// Strings in C can also be truncated and extended by assigning into arrays, 1467 /// e.g. with constructs like: 1468 /// char X[2] = "foobar"; 1469 /// In this case, getByteLength() will return 6, but the string literal will 1470 /// have type "char[2]". 1471 class StringLiteral : public Expr { 1472 public: 1473 enum StringKind { 1474 Ascii, 1475 Wide, 1476 UTF8, 1477 UTF16, 1478 UTF32 1479 }; 1480 1481 private: 1482 friend class ASTStmtReader; 1483 1484 union { 1485 const char *asChar; 1486 const uint16_t *asUInt16; 1487 const uint32_t *asUInt32; 1488 } StrData; 1489 unsigned Length; 1490 unsigned CharByteWidth : 4; 1491 unsigned Kind : 3; 1492 unsigned IsPascal : 1; 1493 unsigned NumConcatenated; 1494 SourceLocation TokLocs[1]; 1495 1496 StringLiteral(QualType Ty) : 1497 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1498 false) {} 1499 1500 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1501 1502 public: 1503 /// This is the "fully general" constructor that allows representation of 1504 /// strings formed from multiple concatenated tokens. 1505 static StringLiteral *Create(const ASTContext &C, StringRef Str, 1506 StringKind Kind, bool Pascal, QualType Ty, 1507 const SourceLocation *Loc, unsigned NumStrs); 1508 1509 /// Simple constructor for string literals made from one token. 1510 static StringLiteral *Create(const ASTContext &C, StringRef Str, 1511 StringKind Kind, bool Pascal, QualType Ty, 1512 SourceLocation Loc) { 1513 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1514 } 1515 1516 /// \brief Construct an empty string literal. 1517 static StringLiteral *CreateEmpty(const ASTContext &C, unsigned NumStrs); 1518 1519 StringRef getString() const { 1520 assert(CharByteWidth==1 1521 && "This function is used in places that assume strings use char"); 1522 return StringRef(StrData.asChar, getByteLength()); 1523 } 1524 1525 /// Allow access to clients that need the byte representation, such as 1526 /// ASTWriterStmt::VisitStringLiteral(). 1527 StringRef getBytes() const { 1528 // FIXME: StringRef may not be the right type to use as a result for this. 1529 if (CharByteWidth == 1) 1530 return StringRef(StrData.asChar, getByteLength()); 1531 if (CharByteWidth == 4) 1532 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1533 getByteLength()); 1534 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1535 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1536 getByteLength()); 1537 } 1538 1539 void outputString(raw_ostream &OS) const; 1540 1541 uint32_t getCodeUnit(size_t i) const { 1542 assert(i < Length && "out of bounds access"); 1543 if (CharByteWidth == 1) 1544 return static_cast<unsigned char>(StrData.asChar[i]); 1545 if (CharByteWidth == 4) 1546 return StrData.asUInt32[i]; 1547 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1548 return StrData.asUInt16[i]; 1549 } 1550 1551 unsigned getByteLength() const { return CharByteWidth*Length; } 1552 unsigned getLength() const { return Length; } 1553 unsigned getCharByteWidth() const { return CharByteWidth; } 1554 1555 /// \brief Sets the string data to the given string data. 1556 void setString(const ASTContext &C, StringRef Str, 1557 StringKind Kind, bool IsPascal); 1558 1559 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1560 1561 1562 bool isAscii() const { return Kind == Ascii; } 1563 bool isWide() const { return Kind == Wide; } 1564 bool isUTF8() const { return Kind == UTF8; } 1565 bool isUTF16() const { return Kind == UTF16; } 1566 bool isUTF32() const { return Kind == UTF32; } 1567 bool isPascal() const { return IsPascal; } 1568 1569 bool containsNonAsciiOrNull() const { 1570 StringRef Str = getString(); 1571 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1572 if (!isASCII(Str[i]) || !Str[i]) 1573 return true; 1574 return false; 1575 } 1576 1577 /// getNumConcatenated - Get the number of string literal tokens that were 1578 /// concatenated in translation phase #6 to form this string literal. 1579 unsigned getNumConcatenated() const { return NumConcatenated; } 1580 1581 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1582 assert(TokNum < NumConcatenated && "Invalid tok number"); 1583 return TokLocs[TokNum]; 1584 } 1585 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1586 assert(TokNum < NumConcatenated && "Invalid tok number"); 1587 TokLocs[TokNum] = L; 1588 } 1589 1590 /// getLocationOfByte - Return a source location that points to the specified 1591 /// byte of this string literal. 1592 /// 1593 /// Strings are amazingly complex. They can be formed from multiple tokens 1594 /// and can have escape sequences in them in addition to the usual trigraph 1595 /// and escaped newline business. This routine handles this complexity. 1596 /// 1597 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1598 const LangOptions &Features, 1599 const TargetInfo &Target) const; 1600 1601 typedef const SourceLocation *tokloc_iterator; 1602 tokloc_iterator tokloc_begin() const { return TokLocs; } 1603 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1604 1605 SourceLocation getLocStart() const LLVM_READONLY { return TokLocs[0]; } 1606 SourceLocation getLocEnd() const LLVM_READONLY { 1607 return TokLocs[NumConcatenated - 1]; 1608 } 1609 1610 static bool classof(const Stmt *T) { 1611 return T->getStmtClass() == StringLiteralClass; 1612 } 1613 1614 // Iterators 1615 child_range children() { return child_range(); } 1616 }; 1617 1618 /// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1619 /// AST node is only formed if full location information is requested. 1620 class ParenExpr : public Expr { 1621 SourceLocation L, R; 1622 Stmt *Val; 1623 public: 1624 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1625 : Expr(ParenExprClass, val->getType(), 1626 val->getValueKind(), val->getObjectKind(), 1627 val->isTypeDependent(), val->isValueDependent(), 1628 val->isInstantiationDependent(), 1629 val->containsUnexpandedParameterPack()), 1630 L(l), R(r), Val(val) {} 1631 1632 /// \brief Construct an empty parenthesized expression. 1633 explicit ParenExpr(EmptyShell Empty) 1634 : Expr(ParenExprClass, Empty) { } 1635 1636 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1637 Expr *getSubExpr() { return cast<Expr>(Val); } 1638 void setSubExpr(Expr *E) { Val = E; } 1639 1640 SourceLocation getLocStart() const LLVM_READONLY { return L; } 1641 SourceLocation getLocEnd() const LLVM_READONLY { return R; } 1642 1643 /// \brief Get the location of the left parentheses '('. 1644 SourceLocation getLParen() const { return L; } 1645 void setLParen(SourceLocation Loc) { L = Loc; } 1646 1647 /// \brief Get the location of the right parentheses ')'. 1648 SourceLocation getRParen() const { return R; } 1649 void setRParen(SourceLocation Loc) { R = Loc; } 1650 1651 static bool classof(const Stmt *T) { 1652 return T->getStmtClass() == ParenExprClass; 1653 } 1654 1655 // Iterators 1656 child_range children() { return child_range(&Val, &Val+1); } 1657 }; 1658 1659 1660 /// UnaryOperator - This represents the unary-expression's (except sizeof and 1661 /// alignof), the postinc/postdec operators from postfix-expression, and various 1662 /// extensions. 1663 /// 1664 /// Notes on various nodes: 1665 /// 1666 /// Real/Imag - These return the real/imag part of a complex operand. If 1667 /// applied to a non-complex value, the former returns its operand and the 1668 /// later returns zero in the type of the operand. 1669 /// 1670 class UnaryOperator : public Expr { 1671 public: 1672 typedef UnaryOperatorKind Opcode; 1673 1674 private: 1675 unsigned Opc : 5; 1676 SourceLocation Loc; 1677 Stmt *Val; 1678 public: 1679 1680 UnaryOperator(Expr *input, Opcode opc, QualType type, 1681 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1682 : Expr(UnaryOperatorClass, type, VK, OK, 1683 input->isTypeDependent() || type->isDependentType(), 1684 input->isValueDependent(), 1685 (input->isInstantiationDependent() || 1686 type->isInstantiationDependentType()), 1687 input->containsUnexpandedParameterPack()), 1688 Opc(opc), Loc(l), Val(input) {} 1689 1690 /// \brief Build an empty unary operator. 1691 explicit UnaryOperator(EmptyShell Empty) 1692 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1693 1694 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1695 void setOpcode(Opcode O) { Opc = O; } 1696 1697 Expr *getSubExpr() const { return cast<Expr>(Val); } 1698 void setSubExpr(Expr *E) { Val = E; } 1699 1700 /// getOperatorLoc - Return the location of the operator. 1701 SourceLocation getOperatorLoc() const { return Loc; } 1702 void setOperatorLoc(SourceLocation L) { Loc = L; } 1703 1704 /// isPostfix - Return true if this is a postfix operation, like x++. 1705 static bool isPostfix(Opcode Op) { 1706 return Op == UO_PostInc || Op == UO_PostDec; 1707 } 1708 1709 /// isPrefix - Return true if this is a prefix operation, like --x. 1710 static bool isPrefix(Opcode Op) { 1711 return Op == UO_PreInc || Op == UO_PreDec; 1712 } 1713 1714 bool isPrefix() const { return isPrefix(getOpcode()); } 1715 bool isPostfix() const { return isPostfix(getOpcode()); } 1716 1717 static bool isIncrementOp(Opcode Op) { 1718 return Op == UO_PreInc || Op == UO_PostInc; 1719 } 1720 bool isIncrementOp() const { 1721 return isIncrementOp(getOpcode()); 1722 } 1723 1724 static bool isDecrementOp(Opcode Op) { 1725 return Op == UO_PreDec || Op == UO_PostDec; 1726 } 1727 bool isDecrementOp() const { 1728 return isDecrementOp(getOpcode()); 1729 } 1730 1731 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1732 bool isIncrementDecrementOp() const { 1733 return isIncrementDecrementOp(getOpcode()); 1734 } 1735 1736 static bool isArithmeticOp(Opcode Op) { 1737 return Op >= UO_Plus && Op <= UO_LNot; 1738 } 1739 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1740 1741 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1742 /// corresponds to, e.g. "sizeof" or "[pre]++" 1743 static StringRef getOpcodeStr(Opcode Op); 1744 1745 /// \brief Retrieve the unary opcode that corresponds to the given 1746 /// overloaded operator. 1747 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1748 1749 /// \brief Retrieve the overloaded operator kind that corresponds to 1750 /// the given unary opcode. 1751 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1752 1753 SourceLocation getLocStart() const LLVM_READONLY { 1754 return isPostfix() ? Val->getLocStart() : Loc; 1755 } 1756 SourceLocation getLocEnd() const LLVM_READONLY { 1757 return isPostfix() ? Loc : Val->getLocEnd(); 1758 } 1759 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; } 1760 1761 static bool classof(const Stmt *T) { 1762 return T->getStmtClass() == UnaryOperatorClass; 1763 } 1764 1765 // Iterators 1766 child_range children() { return child_range(&Val, &Val+1); } 1767 }; 1768 1769 /// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1770 /// offsetof(record-type, member-designator). For example, given: 1771 /// @code 1772 /// struct S { 1773 /// float f; 1774 /// double d; 1775 /// }; 1776 /// struct T { 1777 /// int i; 1778 /// struct S s[10]; 1779 /// }; 1780 /// @endcode 1781 /// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1782 1783 class OffsetOfExpr : public Expr { 1784 public: 1785 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1786 class OffsetOfNode { 1787 public: 1788 /// \brief The kind of offsetof node we have. 1789 enum Kind { 1790 /// \brief An index into an array. 1791 Array = 0x00, 1792 /// \brief A field. 1793 Field = 0x01, 1794 /// \brief A field in a dependent type, known only by its name. 1795 Identifier = 0x02, 1796 /// \brief An implicit indirection through a C++ base class, when the 1797 /// field found is in a base class. 1798 Base = 0x03 1799 }; 1800 1801 private: 1802 enum { MaskBits = 2, Mask = 0x03 }; 1803 1804 /// \brief The source range that covers this part of the designator. 1805 SourceRange Range; 1806 1807 /// \brief The data describing the designator, which comes in three 1808 /// different forms, depending on the lower two bits. 1809 /// - An unsigned index into the array of Expr*'s stored after this node 1810 /// in memory, for [constant-expression] designators. 1811 /// - A FieldDecl*, for references to a known field. 1812 /// - An IdentifierInfo*, for references to a field with a given name 1813 /// when the class type is dependent. 1814 /// - A CXXBaseSpecifier*, for references that look at a field in a 1815 /// base class. 1816 uintptr_t Data; 1817 1818 public: 1819 /// \brief Create an offsetof node that refers to an array element. 1820 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1821 SourceLocation RBracketLoc) 1822 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1823 1824 /// \brief Create an offsetof node that refers to a field. 1825 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1826 SourceLocation NameLoc) 1827 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1828 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1829 1830 /// \brief Create an offsetof node that refers to an identifier. 1831 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1832 SourceLocation NameLoc) 1833 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1834 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1835 1836 /// \brief Create an offsetof node that refers into a C++ base class. 1837 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1838 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1839 1840 /// \brief Determine what kind of offsetof node this is. 1841 Kind getKind() const { 1842 return static_cast<Kind>(Data & Mask); 1843 } 1844 1845 /// \brief For an array element node, returns the index into the array 1846 /// of expressions. 1847 unsigned getArrayExprIndex() const { 1848 assert(getKind() == Array); 1849 return Data >> 2; 1850 } 1851 1852 /// \brief For a field offsetof node, returns the field. 1853 FieldDecl *getField() const { 1854 assert(getKind() == Field); 1855 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1856 } 1857 1858 /// \brief For a field or identifier offsetof node, returns the name of 1859 /// the field. 1860 IdentifierInfo *getFieldName() const; 1861 1862 /// \brief For a base class node, returns the base specifier. 1863 CXXBaseSpecifier *getBase() const { 1864 assert(getKind() == Base); 1865 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1866 } 1867 1868 /// \brief Retrieve the source range that covers this offsetof node. 1869 /// 1870 /// For an array element node, the source range contains the locations of 1871 /// the square brackets. For a field or identifier node, the source range 1872 /// contains the location of the period (if there is one) and the 1873 /// identifier. 1874 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 1875 SourceLocation getLocStart() const LLVM_READONLY { return Range.getBegin(); } 1876 SourceLocation getLocEnd() const LLVM_READONLY { return Range.getEnd(); } 1877 }; 1878 1879 private: 1880 1881 SourceLocation OperatorLoc, RParenLoc; 1882 // Base type; 1883 TypeSourceInfo *TSInfo; 1884 // Number of sub-components (i.e. instances of OffsetOfNode). 1885 unsigned NumComps; 1886 // Number of sub-expressions (i.e. array subscript expressions). 1887 unsigned NumExprs; 1888 1889 OffsetOfExpr(const ASTContext &C, QualType type, 1890 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1891 ArrayRef<OffsetOfNode> comps, ArrayRef<Expr*> exprs, 1892 SourceLocation RParenLoc); 1893 1894 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1895 : Expr(OffsetOfExprClass, EmptyShell()), 1896 TSInfo(nullptr), NumComps(numComps), NumExprs(numExprs) {} 1897 1898 public: 1899 1900 static OffsetOfExpr *Create(const ASTContext &C, QualType type, 1901 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1902 ArrayRef<OffsetOfNode> comps, 1903 ArrayRef<Expr*> exprs, SourceLocation RParenLoc); 1904 1905 static OffsetOfExpr *CreateEmpty(const ASTContext &C, 1906 unsigned NumComps, unsigned NumExprs); 1907 1908 /// getOperatorLoc - Return the location of the operator. 1909 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1910 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1911 1912 /// \brief Return the location of the right parentheses. 1913 SourceLocation getRParenLoc() const { return RParenLoc; } 1914 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1915 1916 TypeSourceInfo *getTypeSourceInfo() const { 1917 return TSInfo; 1918 } 1919 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1920 TSInfo = tsi; 1921 } 1922 1923 const OffsetOfNode &getComponent(unsigned Idx) const { 1924 assert(Idx < NumComps && "Subscript out of range"); 1925 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1926 } 1927 1928 void setComponent(unsigned Idx, OffsetOfNode ON) { 1929 assert(Idx < NumComps && "Subscript out of range"); 1930 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1931 } 1932 1933 unsigned getNumComponents() const { 1934 return NumComps; 1935 } 1936 1937 Expr* getIndexExpr(unsigned Idx) { 1938 assert(Idx < NumExprs && "Subscript out of range"); 1939 return reinterpret_cast<Expr **>( 1940 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1941 } 1942 const Expr *getIndexExpr(unsigned Idx) const { 1943 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1944 } 1945 1946 void setIndexExpr(unsigned Idx, Expr* E) { 1947 assert(Idx < NumComps && "Subscript out of range"); 1948 reinterpret_cast<Expr **>( 1949 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1950 } 1951 1952 unsigned getNumExpressions() const { 1953 return NumExprs; 1954 } 1955 1956 SourceLocation getLocStart() const LLVM_READONLY { return OperatorLoc; } 1957 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 1958 1959 static bool classof(const Stmt *T) { 1960 return T->getStmtClass() == OffsetOfExprClass; 1961 } 1962 1963 // Iterators 1964 child_range children() { 1965 Stmt **begin = 1966 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1967 + NumComps); 1968 return child_range(begin, begin + NumExprs); 1969 } 1970 }; 1971 1972 /// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1973 /// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1974 /// vec_step (OpenCL 1.1 6.11.12). 1975 class UnaryExprOrTypeTraitExpr : public Expr { 1976 union { 1977 TypeSourceInfo *Ty; 1978 Stmt *Ex; 1979 } Argument; 1980 SourceLocation OpLoc, RParenLoc; 1981 1982 public: 1983 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1984 QualType resultType, SourceLocation op, 1985 SourceLocation rp) : 1986 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1987 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1988 // Value-dependent if the argument is type-dependent. 1989 TInfo->getType()->isDependentType(), 1990 TInfo->getType()->isInstantiationDependentType(), 1991 TInfo->getType()->containsUnexpandedParameterPack()), 1992 OpLoc(op), RParenLoc(rp) { 1993 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1994 UnaryExprOrTypeTraitExprBits.IsType = true; 1995 Argument.Ty = TInfo; 1996 } 1997 1998 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1999 QualType resultType, SourceLocation op, 2000 SourceLocation rp); 2001 2002 /// \brief Construct an empty sizeof/alignof expression. 2003 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 2004 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 2005 2006 UnaryExprOrTypeTrait getKind() const { 2007 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind); 2008 } 2009 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;} 2010 2011 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; } 2012 QualType getArgumentType() const { 2013 return getArgumentTypeInfo()->getType(); 2014 } 2015 TypeSourceInfo *getArgumentTypeInfo() const { 2016 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 2017 return Argument.Ty; 2018 } 2019 Expr *getArgumentExpr() { 2020 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 2021 return static_cast<Expr*>(Argument.Ex); 2022 } 2023 const Expr *getArgumentExpr() const { 2024 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 2025 } 2026 2027 void setArgument(Expr *E) { 2028 Argument.Ex = E; 2029 UnaryExprOrTypeTraitExprBits.IsType = false; 2030 } 2031 void setArgument(TypeSourceInfo *TInfo) { 2032 Argument.Ty = TInfo; 2033 UnaryExprOrTypeTraitExprBits.IsType = true; 2034 } 2035 2036 /// Gets the argument type, or the type of the argument expression, whichever 2037 /// is appropriate. 2038 QualType getTypeOfArgument() const { 2039 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 2040 } 2041 2042 SourceLocation getOperatorLoc() const { return OpLoc; } 2043 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2044 2045 SourceLocation getRParenLoc() const { return RParenLoc; } 2046 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2047 2048 SourceLocation getLocStart() const LLVM_READONLY { return OpLoc; } 2049 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 2050 2051 static bool classof(const Stmt *T) { 2052 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 2053 } 2054 2055 // Iterators 2056 child_range children(); 2057 }; 2058 2059 //===----------------------------------------------------------------------===// 2060 // Postfix Operators. 2061 //===----------------------------------------------------------------------===// 2062 2063 /// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 2064 class ArraySubscriptExpr : public Expr { 2065 enum { LHS, RHS, END_EXPR=2 }; 2066 Stmt* SubExprs[END_EXPR]; 2067 SourceLocation RBracketLoc; 2068 public: 2069 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 2070 ExprValueKind VK, ExprObjectKind OK, 2071 SourceLocation rbracketloc) 2072 : Expr(ArraySubscriptExprClass, t, VK, OK, 2073 lhs->isTypeDependent() || rhs->isTypeDependent(), 2074 lhs->isValueDependent() || rhs->isValueDependent(), 2075 (lhs->isInstantiationDependent() || 2076 rhs->isInstantiationDependent()), 2077 (lhs->containsUnexpandedParameterPack() || 2078 rhs->containsUnexpandedParameterPack())), 2079 RBracketLoc(rbracketloc) { 2080 SubExprs[LHS] = lhs; 2081 SubExprs[RHS] = rhs; 2082 } 2083 2084 /// \brief Create an empty array subscript expression. 2085 explicit ArraySubscriptExpr(EmptyShell Shell) 2086 : Expr(ArraySubscriptExprClass, Shell) { } 2087 2088 /// An array access can be written A[4] or 4[A] (both are equivalent). 2089 /// - getBase() and getIdx() always present the normalized view: A[4]. 2090 /// In this case getBase() returns "A" and getIdx() returns "4". 2091 /// - getLHS() and getRHS() present the syntactic view. e.g. for 2092 /// 4[A] getLHS() returns "4". 2093 /// Note: Because vector element access is also written A[4] we must 2094 /// predicate the format conversion in getBase and getIdx only on the 2095 /// the type of the RHS, as it is possible for the LHS to be a vector of 2096 /// integer type 2097 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 2098 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2099 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2100 2101 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 2102 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2103 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2104 2105 Expr *getBase() { 2106 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 2107 } 2108 2109 const Expr *getBase() const { 2110 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 2111 } 2112 2113 Expr *getIdx() { 2114 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2115 } 2116 2117 const Expr *getIdx() const { 2118 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2119 } 2120 2121 SourceLocation getLocStart() const LLVM_READONLY { 2122 return getLHS()->getLocStart(); 2123 } 2124 SourceLocation getLocEnd() const LLVM_READONLY { return RBracketLoc; } 2125 2126 SourceLocation getRBracketLoc() const { return RBracketLoc; } 2127 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 2128 2129 SourceLocation getExprLoc() const LLVM_READONLY { 2130 return getBase()->getExprLoc(); 2131 } 2132 2133 static bool classof(const Stmt *T) { 2134 return T->getStmtClass() == ArraySubscriptExprClass; 2135 } 2136 2137 // Iterators 2138 child_range children() { 2139 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2140 } 2141 }; 2142 2143 2144 /// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 2145 /// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 2146 /// while its subclasses may represent alternative syntax that (semantically) 2147 /// results in a function call. For example, CXXOperatorCallExpr is 2148 /// a subclass for overloaded operator calls that use operator syntax, e.g., 2149 /// "str1 + str2" to resolve to a function call. 2150 class CallExpr : public Expr { 2151 enum { FN=0, PREARGS_START=1 }; 2152 Stmt **SubExprs; 2153 unsigned NumArgs; 2154 SourceLocation RParenLoc; 2155 2156 protected: 2157 // These versions of the constructor are for derived classes. 2158 CallExpr(const ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 2159 ArrayRef<Expr*> args, QualType t, ExprValueKind VK, 2160 SourceLocation rparenloc); 2161 CallExpr(const ASTContext &C, StmtClass SC, unsigned NumPreArgs, 2162 EmptyShell Empty); 2163 2164 Stmt *getPreArg(unsigned i) { 2165 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2166 return SubExprs[PREARGS_START+i]; 2167 } 2168 const Stmt *getPreArg(unsigned i) const { 2169 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2170 return SubExprs[PREARGS_START+i]; 2171 } 2172 void setPreArg(unsigned i, Stmt *PreArg) { 2173 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2174 SubExprs[PREARGS_START+i] = PreArg; 2175 } 2176 2177 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2178 2179 public: 2180 CallExpr(const ASTContext& C, Expr *fn, ArrayRef<Expr*> args, QualType t, 2181 ExprValueKind VK, SourceLocation rparenloc); 2182 2183 /// \brief Build an empty call expression. 2184 CallExpr(const ASTContext &C, StmtClass SC, EmptyShell Empty); 2185 2186 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2187 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2188 void setCallee(Expr *F) { SubExprs[FN] = F; } 2189 2190 Decl *getCalleeDecl(); 2191 const Decl *getCalleeDecl() const { 2192 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2193 } 2194 2195 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2196 FunctionDecl *getDirectCallee(); 2197 const FunctionDecl *getDirectCallee() const { 2198 return const_cast<CallExpr*>(this)->getDirectCallee(); 2199 } 2200 2201 /// getNumArgs - Return the number of actual arguments to this call. 2202 /// 2203 unsigned getNumArgs() const { return NumArgs; } 2204 2205 /// \brief Retrieve the call arguments. 2206 Expr **getArgs() { 2207 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2208 } 2209 const Expr *const *getArgs() const { 2210 return const_cast<CallExpr*>(this)->getArgs(); 2211 } 2212 2213 /// getArg - Return the specified argument. 2214 Expr *getArg(unsigned Arg) { 2215 assert(Arg < NumArgs && "Arg access out of range!"); 2216 return cast_or_null<Expr>(SubExprs[Arg + getNumPreArgs() + PREARGS_START]); 2217 } 2218 const Expr *getArg(unsigned Arg) const { 2219 assert(Arg < NumArgs && "Arg access out of range!"); 2220 return cast_or_null<Expr>(SubExprs[Arg + getNumPreArgs() + PREARGS_START]); 2221 } 2222 2223 /// setArg - Set the specified argument. 2224 void setArg(unsigned Arg, Expr *ArgExpr) { 2225 assert(Arg < NumArgs && "Arg access out of range!"); 2226 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2227 } 2228 2229 /// setNumArgs - This changes the number of arguments present in this call. 2230 /// Any orphaned expressions are deleted by this, and any new operands are set 2231 /// to null. 2232 void setNumArgs(const ASTContext& C, unsigned NumArgs); 2233 2234 typedef ExprIterator arg_iterator; 2235 typedef ConstExprIterator const_arg_iterator; 2236 typedef llvm::iterator_range<arg_iterator> arg_range; 2237 typedef llvm::iterator_range<const_arg_iterator> arg_const_range; 2238 2239 arg_range arguments() { return arg_range(arg_begin(), arg_end()); } 2240 arg_const_range arguments() const { 2241 return arg_const_range(arg_begin(), arg_end()); 2242 } 2243 2244 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2245 arg_iterator arg_end() { 2246 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2247 } 2248 const_arg_iterator arg_begin() const { 2249 return SubExprs+PREARGS_START+getNumPreArgs(); 2250 } 2251 const_arg_iterator arg_end() const { 2252 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2253 } 2254 2255 /// This method provides fast access to all the subexpressions of 2256 /// a CallExpr without going through the slower virtual child_iterator 2257 /// interface. This provides efficient reverse iteration of the 2258 /// subexpressions. This is currently used for CFG construction. 2259 ArrayRef<Stmt*> getRawSubExprs() { 2260 return llvm::makeArrayRef(SubExprs, 2261 getNumPreArgs() + PREARGS_START + getNumArgs()); 2262 } 2263 2264 /// getNumCommas - Return the number of commas that must have been present in 2265 /// this function call. 2266 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2267 2268 /// getBuiltinCallee - If this is a call to a builtin, return the builtin ID 2269 /// of the callee. If not, return 0. 2270 unsigned getBuiltinCallee() const; 2271 2272 /// \brief Returns \c true if this is a call to a builtin which does not 2273 /// evaluate side-effects within its arguments. 2274 bool isUnevaluatedBuiltinCall(ASTContext &Ctx) const; 2275 2276 /// getCallReturnType - Get the return type of the call expr. This is not 2277 /// always the type of the expr itself, if the return type is a reference 2278 /// type. 2279 QualType getCallReturnType(const ASTContext &Ctx) const; 2280 2281 SourceLocation getRParenLoc() const { return RParenLoc; } 2282 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2283 2284 SourceLocation getLocStart() const LLVM_READONLY; 2285 SourceLocation getLocEnd() const LLVM_READONLY; 2286 2287 static bool classof(const Stmt *T) { 2288 return T->getStmtClass() >= firstCallExprConstant && 2289 T->getStmtClass() <= lastCallExprConstant; 2290 } 2291 2292 // Iterators 2293 child_range children() { 2294 return child_range(&SubExprs[0], 2295 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2296 } 2297 }; 2298 2299 /// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2300 /// 2301 class MemberExpr : public Expr { 2302 /// Extra data stored in some member expressions. 2303 struct MemberNameQualifier { 2304 /// \brief The nested-name-specifier that qualifies the name, including 2305 /// source-location information. 2306 NestedNameSpecifierLoc QualifierLoc; 2307 2308 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2309 /// name qualifiers. 2310 DeclAccessPair FoundDecl; 2311 }; 2312 2313 /// Base - the expression for the base pointer or structure references. In 2314 /// X.F, this is "X". 2315 Stmt *Base; 2316 2317 /// MemberDecl - This is the decl being referenced by the field/member name. 2318 /// In X.F, this is the decl referenced by F. 2319 ValueDecl *MemberDecl; 2320 2321 /// MemberDNLoc - Provides source/type location info for the 2322 /// declaration name embedded in MemberDecl. 2323 DeclarationNameLoc MemberDNLoc; 2324 2325 /// MemberLoc - This is the location of the member name. 2326 SourceLocation MemberLoc; 2327 2328 /// This is the location of the -> or . in the expression. 2329 SourceLocation OperatorLoc; 2330 2331 /// IsArrow - True if this is "X->F", false if this is "X.F". 2332 bool IsArrow : 1; 2333 2334 /// \brief True if this member expression used a nested-name-specifier to 2335 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2336 /// declaration. When true, a MemberNameQualifier 2337 /// structure is allocated immediately after the MemberExpr. 2338 bool HasQualifierOrFoundDecl : 1; 2339 2340 /// \brief True if this member expression specified a template keyword 2341 /// and/or a template argument list explicitly, e.g., x->f<int>, 2342 /// x->template f, x->template f<int>. 2343 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2344 /// TemplateArguments (if any) are allocated immediately after 2345 /// the MemberExpr or, if the member expression also has a qualifier, 2346 /// after the MemberNameQualifier structure. 2347 bool HasTemplateKWAndArgsInfo : 1; 2348 2349 /// \brief True if this member expression refers to a method that 2350 /// was resolved from an overloaded set having size greater than 1. 2351 bool HadMultipleCandidates : 1; 2352 2353 /// \brief Retrieve the qualifier that preceded the member name, if any. 2354 MemberNameQualifier *getMemberQualifier() { 2355 assert(HasQualifierOrFoundDecl); 2356 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2357 } 2358 2359 /// \brief Retrieve the qualifier that preceded the member name, if any. 2360 const MemberNameQualifier *getMemberQualifier() const { 2361 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2362 } 2363 2364 public: 2365 MemberExpr(Expr *base, bool isarrow, SourceLocation operatorloc, 2366 ValueDecl *memberdecl, const DeclarationNameInfo &NameInfo, 2367 QualType ty, ExprValueKind VK, ExprObjectKind OK) 2368 : Expr(MemberExprClass, ty, VK, OK, base->isTypeDependent(), 2369 base->isValueDependent(), base->isInstantiationDependent(), 2370 base->containsUnexpandedParameterPack()), 2371 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()), 2372 MemberLoc(NameInfo.getLoc()), OperatorLoc(operatorloc), 2373 IsArrow(isarrow), HasQualifierOrFoundDecl(false), 2374 HasTemplateKWAndArgsInfo(false), HadMultipleCandidates(false) { 2375 assert(memberdecl->getDeclName() == NameInfo.getName()); 2376 } 2377 2378 // NOTE: this constructor should be used only when it is known that 2379 // the member name can not provide additional syntactic info 2380 // (i.e., source locations for C++ operator names or type source info 2381 // for constructors, destructors and conversion operators). 2382 MemberExpr(Expr *base, bool isarrow, SourceLocation operatorloc, 2383 ValueDecl *memberdecl, SourceLocation l, QualType ty, 2384 ExprValueKind VK, ExprObjectKind OK) 2385 : Expr(MemberExprClass, ty, VK, OK, base->isTypeDependent(), 2386 base->isValueDependent(), base->isInstantiationDependent(), 2387 base->containsUnexpandedParameterPack()), 2388 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l), 2389 OperatorLoc(operatorloc), IsArrow(isarrow), 2390 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2391 HadMultipleCandidates(false) {} 2392 2393 static MemberExpr *Create(const ASTContext &C, Expr *base, bool isarrow, 2394 SourceLocation OperatorLoc, 2395 NestedNameSpecifierLoc QualifierLoc, 2396 SourceLocation TemplateKWLoc, ValueDecl *memberdecl, 2397 DeclAccessPair founddecl, 2398 DeclarationNameInfo MemberNameInfo, 2399 const TemplateArgumentListInfo *targs, QualType ty, 2400 ExprValueKind VK, ExprObjectKind OK); 2401 2402 void setBase(Expr *E) { Base = E; } 2403 Expr *getBase() const { return cast<Expr>(Base); } 2404 2405 /// \brief Retrieve the member declaration to which this expression refers. 2406 /// 2407 /// The returned declaration will either be a FieldDecl or (in C++) 2408 /// a CXXMethodDecl. 2409 ValueDecl *getMemberDecl() const { return MemberDecl; } 2410 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2411 2412 /// \brief Retrieves the declaration found by lookup. 2413 DeclAccessPair getFoundDecl() const { 2414 if (!HasQualifierOrFoundDecl) 2415 return DeclAccessPair::make(getMemberDecl(), 2416 getMemberDecl()->getAccess()); 2417 return getMemberQualifier()->FoundDecl; 2418 } 2419 2420 /// \brief Determines whether this member expression actually had 2421 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2422 /// x->Base::foo. 2423 bool hasQualifier() const { return getQualifier() != nullptr; } 2424 2425 /// \brief If the member name was qualified, retrieves the 2426 /// nested-name-specifier that precedes the member name. Otherwise, returns 2427 /// NULL. 2428 NestedNameSpecifier *getQualifier() const { 2429 if (!HasQualifierOrFoundDecl) 2430 return nullptr; 2431 2432 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2433 } 2434 2435 /// \brief If the member name was qualified, retrieves the 2436 /// nested-name-specifier that precedes the member name, with source-location 2437 /// information. 2438 NestedNameSpecifierLoc getQualifierLoc() const { 2439 if (!hasQualifier()) 2440 return NestedNameSpecifierLoc(); 2441 2442 return getMemberQualifier()->QualifierLoc; 2443 } 2444 2445 /// \brief Return the optional template keyword and arguments info. 2446 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 2447 if (!HasTemplateKWAndArgsInfo) 2448 return nullptr; 2449 2450 if (!HasQualifierOrFoundDecl) 2451 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 2452 2453 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 2454 getMemberQualifier() + 1); 2455 } 2456 2457 /// \brief Return the optional template keyword and arguments info. 2458 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 2459 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo(); 2460 } 2461 2462 /// \brief Retrieve the location of the template keyword preceding 2463 /// the member name, if any. 2464 SourceLocation getTemplateKeywordLoc() const { 2465 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2466 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 2467 } 2468 2469 /// \brief Retrieve the location of the left angle bracket starting the 2470 /// explicit template argument list following the member name, if any. 2471 SourceLocation getLAngleLoc() const { 2472 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2473 return getTemplateKWAndArgsInfo()->LAngleLoc; 2474 } 2475 2476 /// \brief Retrieve the location of the right angle bracket ending the 2477 /// explicit template argument list following the member name, if any. 2478 SourceLocation getRAngleLoc() const { 2479 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2480 return getTemplateKWAndArgsInfo()->RAngleLoc; 2481 } 2482 2483 /// Determines whether the member name was preceded by the template keyword. 2484 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2485 2486 /// \brief Determines whether the member name was followed by an 2487 /// explicit template argument list. 2488 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2489 2490 /// \brief Copies the template arguments (if present) into the given 2491 /// structure. 2492 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2493 if (hasExplicitTemplateArgs()) 2494 getExplicitTemplateArgs().copyInto(List); 2495 } 2496 2497 /// \brief Retrieve the explicit template argument list that 2498 /// follow the member template name. This must only be called on an 2499 /// expression with explicit template arguments. 2500 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2501 assert(hasExplicitTemplateArgs()); 2502 return *getTemplateKWAndArgsInfo(); 2503 } 2504 2505 /// \brief Retrieve the explicit template argument list that 2506 /// followed the member template name. This must only be called on 2507 /// an expression with explicit template arguments. 2508 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2509 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2510 } 2511 2512 /// \brief Retrieves the optional explicit template arguments. 2513 /// This points to the same data as getExplicitTemplateArgs(), but 2514 /// returns null if there are no explicit template arguments. 2515 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2516 if (!hasExplicitTemplateArgs()) return nullptr; 2517 return &getExplicitTemplateArgs(); 2518 } 2519 2520 /// \brief Retrieve the template arguments provided as part of this 2521 /// template-id. 2522 const TemplateArgumentLoc *getTemplateArgs() const { 2523 if (!hasExplicitTemplateArgs()) 2524 return nullptr; 2525 2526 return getExplicitTemplateArgs().getTemplateArgs(); 2527 } 2528 2529 /// \brief Retrieve the number of template arguments provided as part of this 2530 /// template-id. 2531 unsigned getNumTemplateArgs() const { 2532 if (!hasExplicitTemplateArgs()) 2533 return 0; 2534 2535 return getExplicitTemplateArgs().NumTemplateArgs; 2536 } 2537 2538 /// \brief Retrieve the member declaration name info. 2539 DeclarationNameInfo getMemberNameInfo() const { 2540 return DeclarationNameInfo(MemberDecl->getDeclName(), 2541 MemberLoc, MemberDNLoc); 2542 } 2543 2544 SourceLocation getOperatorLoc() const LLVM_READONLY { return OperatorLoc; } 2545 2546 bool isArrow() const { return IsArrow; } 2547 void setArrow(bool A) { IsArrow = A; } 2548 2549 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2550 /// location of 'F'. 2551 SourceLocation getMemberLoc() const { return MemberLoc; } 2552 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2553 2554 SourceLocation getLocStart() const LLVM_READONLY; 2555 SourceLocation getLocEnd() const LLVM_READONLY; 2556 2557 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; } 2558 2559 /// \brief Determine whether the base of this explicit is implicit. 2560 bool isImplicitAccess() const { 2561 return getBase() && getBase()->isImplicitCXXThis(); 2562 } 2563 2564 /// \brief Returns true if this member expression refers to a method that 2565 /// was resolved from an overloaded set having size greater than 1. 2566 bool hadMultipleCandidates() const { 2567 return HadMultipleCandidates; 2568 } 2569 /// \brief Sets the flag telling whether this expression refers to 2570 /// a method that was resolved from an overloaded set having size 2571 /// greater than 1. 2572 void setHadMultipleCandidates(bool V = true) { 2573 HadMultipleCandidates = V; 2574 } 2575 2576 static bool classof(const Stmt *T) { 2577 return T->getStmtClass() == MemberExprClass; 2578 } 2579 2580 // Iterators 2581 child_range children() { return child_range(&Base, &Base+1); } 2582 2583 friend class ASTReader; 2584 friend class ASTStmtWriter; 2585 }; 2586 2587 /// CompoundLiteralExpr - [C99 6.5.2.5] 2588 /// 2589 class CompoundLiteralExpr : public Expr { 2590 /// LParenLoc - If non-null, this is the location of the left paren in a 2591 /// compound literal like "(int){4}". This can be null if this is a 2592 /// synthesized compound expression. 2593 SourceLocation LParenLoc; 2594 2595 /// The type as written. This can be an incomplete array type, in 2596 /// which case the actual expression type will be different. 2597 /// The int part of the pair stores whether this expr is file scope. 2598 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope; 2599 Stmt *Init; 2600 public: 2601 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2602 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2603 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2604 tinfo->getType()->isDependentType(), 2605 init->isValueDependent(), 2606 (init->isInstantiationDependent() || 2607 tinfo->getType()->isInstantiationDependentType()), 2608 init->containsUnexpandedParameterPack()), 2609 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {} 2610 2611 /// \brief Construct an empty compound literal. 2612 explicit CompoundLiteralExpr(EmptyShell Empty) 2613 : Expr(CompoundLiteralExprClass, Empty) { } 2614 2615 const Expr *getInitializer() const { return cast<Expr>(Init); } 2616 Expr *getInitializer() { return cast<Expr>(Init); } 2617 void setInitializer(Expr *E) { Init = E; } 2618 2619 bool isFileScope() const { return TInfoAndScope.getInt(); } 2620 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); } 2621 2622 SourceLocation getLParenLoc() const { return LParenLoc; } 2623 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2624 2625 TypeSourceInfo *getTypeSourceInfo() const { 2626 return TInfoAndScope.getPointer(); 2627 } 2628 void setTypeSourceInfo(TypeSourceInfo *tinfo) { 2629 TInfoAndScope.setPointer(tinfo); 2630 } 2631 2632 SourceLocation getLocStart() const LLVM_READONLY { 2633 // FIXME: Init should never be null. 2634 if (!Init) 2635 return SourceLocation(); 2636 if (LParenLoc.isInvalid()) 2637 return Init->getLocStart(); 2638 return LParenLoc; 2639 } 2640 SourceLocation getLocEnd() const LLVM_READONLY { 2641 // FIXME: Init should never be null. 2642 if (!Init) 2643 return SourceLocation(); 2644 return Init->getLocEnd(); 2645 } 2646 2647 static bool classof(const Stmt *T) { 2648 return T->getStmtClass() == CompoundLiteralExprClass; 2649 } 2650 2651 // Iterators 2652 child_range children() { return child_range(&Init, &Init+1); } 2653 }; 2654 2655 /// CastExpr - Base class for type casts, including both implicit 2656 /// casts (ImplicitCastExpr) and explicit casts that have some 2657 /// representation in the source code (ExplicitCastExpr's derived 2658 /// classes). 2659 class CastExpr : public Expr { 2660 private: 2661 Stmt *Op; 2662 2663 bool CastConsistency() const; 2664 2665 const CXXBaseSpecifier * const *path_buffer() const { 2666 return const_cast<CastExpr*>(this)->path_buffer(); 2667 } 2668 CXXBaseSpecifier **path_buffer(); 2669 2670 void setBasePathSize(unsigned basePathSize) { 2671 CastExprBits.BasePathSize = basePathSize; 2672 assert(CastExprBits.BasePathSize == basePathSize && 2673 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2674 } 2675 2676 protected: 2677 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, const CastKind kind, 2678 Expr *op, unsigned BasePathSize) 2679 : Expr(SC, ty, VK, OK_Ordinary, 2680 // Cast expressions are type-dependent if the type is 2681 // dependent (C++ [temp.dep.expr]p3). 2682 ty->isDependentType(), 2683 // Cast expressions are value-dependent if the type is 2684 // dependent or if the subexpression is value-dependent. 2685 ty->isDependentType() || (op && op->isValueDependent()), 2686 (ty->isInstantiationDependentType() || 2687 (op && op->isInstantiationDependent())), 2688 // An implicit cast expression doesn't (lexically) contain an 2689 // unexpanded pack, even if its target type does. 2690 ((SC != ImplicitCastExprClass && 2691 ty->containsUnexpandedParameterPack()) || 2692 (op && op->containsUnexpandedParameterPack()))), 2693 Op(op) { 2694 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2695 CastExprBits.Kind = kind; 2696 setBasePathSize(BasePathSize); 2697 assert(CastConsistency()); 2698 } 2699 2700 /// \brief Construct an empty cast. 2701 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2702 : Expr(SC, Empty) { 2703 setBasePathSize(BasePathSize); 2704 } 2705 2706 public: 2707 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2708 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2709 const char *getCastKindName() const; 2710 2711 Expr *getSubExpr() { return cast<Expr>(Op); } 2712 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2713 void setSubExpr(Expr *E) { Op = E; } 2714 2715 /// \brief Retrieve the cast subexpression as it was written in the source 2716 /// code, looking through any implicit casts or other intermediate nodes 2717 /// introduced by semantic analysis. 2718 Expr *getSubExprAsWritten(); 2719 const Expr *getSubExprAsWritten() const { 2720 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2721 } 2722 2723 typedef CXXBaseSpecifier **path_iterator; 2724 typedef const CXXBaseSpecifier * const *path_const_iterator; 2725 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2726 unsigned path_size() const { return CastExprBits.BasePathSize; } 2727 path_iterator path_begin() { return path_buffer(); } 2728 path_iterator path_end() { return path_buffer() + path_size(); } 2729 path_const_iterator path_begin() const { return path_buffer(); } 2730 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2731 2732 void setCastPath(const CXXCastPath &Path); 2733 2734 static bool classof(const Stmt *T) { 2735 return T->getStmtClass() >= firstCastExprConstant && 2736 T->getStmtClass() <= lastCastExprConstant; 2737 } 2738 2739 // Iterators 2740 child_range children() { return child_range(&Op, &Op+1); } 2741 }; 2742 2743 /// ImplicitCastExpr - Allows us to explicitly represent implicit type 2744 /// conversions, which have no direct representation in the original 2745 /// source code. For example: converting T[]->T*, void f()->void 2746 /// (*f)(), float->double, short->int, etc. 2747 /// 2748 /// In C, implicit casts always produce rvalues. However, in C++, an 2749 /// implicit cast whose result is being bound to a reference will be 2750 /// an lvalue or xvalue. For example: 2751 /// 2752 /// @code 2753 /// class Base { }; 2754 /// class Derived : public Base { }; 2755 /// Derived &&ref(); 2756 /// void f(Derived d) { 2757 /// Base& b = d; // initializer is an ImplicitCastExpr 2758 /// // to an lvalue of type Base 2759 /// Base&& r = ref(); // initializer is an ImplicitCastExpr 2760 /// // to an xvalue of type Base 2761 /// } 2762 /// @endcode 2763 class ImplicitCastExpr : public CastExpr { 2764 private: 2765 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2766 unsigned BasePathLength, ExprValueKind VK) 2767 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2768 } 2769 2770 /// \brief Construct an empty implicit cast. 2771 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2772 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2773 2774 public: 2775 enum OnStack_t { OnStack }; 2776 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2777 ExprValueKind VK) 2778 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2779 } 2780 2781 static ImplicitCastExpr *Create(const ASTContext &Context, QualType T, 2782 CastKind Kind, Expr *Operand, 2783 const CXXCastPath *BasePath, 2784 ExprValueKind Cat); 2785 2786 static ImplicitCastExpr *CreateEmpty(const ASTContext &Context, 2787 unsigned PathSize); 2788 2789 SourceLocation getLocStart() const LLVM_READONLY { 2790 return getSubExpr()->getLocStart(); 2791 } 2792 SourceLocation getLocEnd() const LLVM_READONLY { 2793 return getSubExpr()->getLocEnd(); 2794 } 2795 2796 static bool classof(const Stmt *T) { 2797 return T->getStmtClass() == ImplicitCastExprClass; 2798 } 2799 }; 2800 2801 inline Expr *Expr::IgnoreImpCasts() { 2802 Expr *e = this; 2803 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2804 e = ice->getSubExpr(); 2805 return e; 2806 } 2807 2808 /// ExplicitCastExpr - An explicit cast written in the source 2809 /// code. 2810 /// 2811 /// This class is effectively an abstract class, because it provides 2812 /// the basic representation of an explicitly-written cast without 2813 /// specifying which kind of cast (C cast, functional cast, static 2814 /// cast, etc.) was written; specific derived classes represent the 2815 /// particular style of cast and its location information. 2816 /// 2817 /// Unlike implicit casts, explicit cast nodes have two different 2818 /// types: the type that was written into the source code, and the 2819 /// actual type of the expression as determined by semantic 2820 /// analysis. These types may differ slightly. For example, in C++ one 2821 /// can cast to a reference type, which indicates that the resulting 2822 /// expression will be an lvalue or xvalue. The reference type, however, 2823 /// will not be used as the type of the expression. 2824 class ExplicitCastExpr : public CastExpr { 2825 /// TInfo - Source type info for the (written) type 2826 /// this expression is casting to. 2827 TypeSourceInfo *TInfo; 2828 2829 protected: 2830 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2831 CastKind kind, Expr *op, unsigned PathSize, 2832 TypeSourceInfo *writtenTy) 2833 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2834 2835 /// \brief Construct an empty explicit cast. 2836 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2837 : CastExpr(SC, Shell, PathSize) { } 2838 2839 public: 2840 /// getTypeInfoAsWritten - Returns the type source info for the type 2841 /// that this expression is casting to. 2842 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2843 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2844 2845 /// getTypeAsWritten - Returns the type that this expression is 2846 /// casting to, as written in the source code. 2847 QualType getTypeAsWritten() const { return TInfo->getType(); } 2848 2849 static bool classof(const Stmt *T) { 2850 return T->getStmtClass() >= firstExplicitCastExprConstant && 2851 T->getStmtClass() <= lastExplicitCastExprConstant; 2852 } 2853 }; 2854 2855 /// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2856 /// cast in C++ (C++ [expr.cast]), which uses the syntax 2857 /// (Type)expr. For example: @c (int)f. 2858 class CStyleCastExpr : public ExplicitCastExpr { 2859 SourceLocation LPLoc; // the location of the left paren 2860 SourceLocation RPLoc; // the location of the right paren 2861 2862 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2863 unsigned PathSize, TypeSourceInfo *writtenTy, 2864 SourceLocation l, SourceLocation r) 2865 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2866 writtenTy), LPLoc(l), RPLoc(r) {} 2867 2868 /// \brief Construct an empty C-style explicit cast. 2869 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2870 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2871 2872 public: 2873 static CStyleCastExpr *Create(const ASTContext &Context, QualType T, 2874 ExprValueKind VK, CastKind K, 2875 Expr *Op, const CXXCastPath *BasePath, 2876 TypeSourceInfo *WrittenTy, SourceLocation L, 2877 SourceLocation R); 2878 2879 static CStyleCastExpr *CreateEmpty(const ASTContext &Context, 2880 unsigned PathSize); 2881 2882 SourceLocation getLParenLoc() const { return LPLoc; } 2883 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2884 2885 SourceLocation getRParenLoc() const { return RPLoc; } 2886 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2887 2888 SourceLocation getLocStart() const LLVM_READONLY { return LPLoc; } 2889 SourceLocation getLocEnd() const LLVM_READONLY { 2890 return getSubExpr()->getLocEnd(); 2891 } 2892 2893 static bool classof(const Stmt *T) { 2894 return T->getStmtClass() == CStyleCastExprClass; 2895 } 2896 }; 2897 2898 /// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2899 /// 2900 /// This expression node kind describes a builtin binary operation, 2901 /// such as "x + y" for integer values "x" and "y". The operands will 2902 /// already have been converted to appropriate types (e.g., by 2903 /// performing promotions or conversions). 2904 /// 2905 /// In C++, where operators may be overloaded, a different kind of 2906 /// expression node (CXXOperatorCallExpr) is used to express the 2907 /// invocation of an overloaded operator with operator syntax. Within 2908 /// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2909 /// used to store an expression "x + y" depends on the subexpressions 2910 /// for x and y. If neither x or y is type-dependent, and the "+" 2911 /// operator resolves to a built-in operation, BinaryOperator will be 2912 /// used to express the computation (x and y may still be 2913 /// value-dependent). If either x or y is type-dependent, or if the 2914 /// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2915 /// be used to express the computation. 2916 class BinaryOperator : public Expr { 2917 public: 2918 typedef BinaryOperatorKind Opcode; 2919 2920 private: 2921 unsigned Opc : 6; 2922 2923 // Records the FP_CONTRACT pragma status at the point that this binary 2924 // operator was parsed. This bit is only meaningful for operations on 2925 // floating point types. For all other types it should default to 2926 // false. 2927 unsigned FPContractable : 1; 2928 SourceLocation OpLoc; 2929 2930 enum { LHS, RHS, END_EXPR }; 2931 Stmt* SubExprs[END_EXPR]; 2932 public: 2933 2934 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2935 ExprValueKind VK, ExprObjectKind OK, 2936 SourceLocation opLoc, bool fpContractable) 2937 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2938 lhs->isTypeDependent() || rhs->isTypeDependent(), 2939 lhs->isValueDependent() || rhs->isValueDependent(), 2940 (lhs->isInstantiationDependent() || 2941 rhs->isInstantiationDependent()), 2942 (lhs->containsUnexpandedParameterPack() || 2943 rhs->containsUnexpandedParameterPack())), 2944 Opc(opc), FPContractable(fpContractable), OpLoc(opLoc) { 2945 SubExprs[LHS] = lhs; 2946 SubExprs[RHS] = rhs; 2947 assert(!isCompoundAssignmentOp() && 2948 "Use CompoundAssignOperator for compound assignments"); 2949 } 2950 2951 /// \brief Construct an empty binary operator. 2952 explicit BinaryOperator(EmptyShell Empty) 2953 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2954 2955 SourceLocation getExprLoc() const LLVM_READONLY { return OpLoc; } 2956 SourceLocation getOperatorLoc() const { return OpLoc; } 2957 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2958 2959 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2960 void setOpcode(Opcode O) { Opc = O; } 2961 2962 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2963 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2964 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2965 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2966 2967 SourceLocation getLocStart() const LLVM_READONLY { 2968 return getLHS()->getLocStart(); 2969 } 2970 SourceLocation getLocEnd() const LLVM_READONLY { 2971 return getRHS()->getLocEnd(); 2972 } 2973 2974 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2975 /// corresponds to, e.g. "<<=". 2976 static StringRef getOpcodeStr(Opcode Op); 2977 2978 StringRef getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2979 2980 /// \brief Retrieve the binary opcode that corresponds to the given 2981 /// overloaded operator. 2982 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2983 2984 /// \brief Retrieve the overloaded operator kind that corresponds to 2985 /// the given binary opcode. 2986 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2987 2988 /// predicates to categorize the respective opcodes. 2989 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2990 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2991 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2992 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2993 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2994 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2995 2996 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2997 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2998 2999 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 3000 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 3001 3002 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 3003 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 3004 3005 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 3006 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 3007 3008 static Opcode negateComparisonOp(Opcode Opc) { 3009 switch (Opc) { 3010 default: 3011 llvm_unreachable("Not a comparsion operator."); 3012 case BO_LT: return BO_GE; 3013 case BO_GT: return BO_LE; 3014 case BO_LE: return BO_GT; 3015 case BO_GE: return BO_LT; 3016 case BO_EQ: return BO_NE; 3017 case BO_NE: return BO_EQ; 3018 } 3019 } 3020 3021 static Opcode reverseComparisonOp(Opcode Opc) { 3022 switch (Opc) { 3023 default: 3024 llvm_unreachable("Not a comparsion operator."); 3025 case BO_LT: return BO_GT; 3026 case BO_GT: return BO_LT; 3027 case BO_LE: return BO_GE; 3028 case BO_GE: return BO_LE; 3029 case BO_EQ: 3030 case BO_NE: 3031 return Opc; 3032 } 3033 } 3034 3035 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 3036 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 3037 3038 static bool isAssignmentOp(Opcode Opc) { 3039 return Opc >= BO_Assign && Opc <= BO_OrAssign; 3040 } 3041 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 3042 3043 static bool isCompoundAssignmentOp(Opcode Opc) { 3044 return Opc > BO_Assign && Opc <= BO_OrAssign; 3045 } 3046 bool isCompoundAssignmentOp() const { 3047 return isCompoundAssignmentOp(getOpcode()); 3048 } 3049 static Opcode getOpForCompoundAssignment(Opcode Opc) { 3050 assert(isCompoundAssignmentOp(Opc)); 3051 if (Opc >= BO_AndAssign) 3052 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 3053 else 3054 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 3055 } 3056 3057 static bool isShiftAssignOp(Opcode Opc) { 3058 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 3059 } 3060 bool isShiftAssignOp() const { 3061 return isShiftAssignOp(getOpcode()); 3062 } 3063 3064 static bool classof(const Stmt *S) { 3065 return S->getStmtClass() >= firstBinaryOperatorConstant && 3066 S->getStmtClass() <= lastBinaryOperatorConstant; 3067 } 3068 3069 // Iterators 3070 child_range children() { 3071 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3072 } 3073 3074 // Set the FP contractability status of this operator. Only meaningful for 3075 // operations on floating point types. 3076 void setFPContractable(bool FPC) { FPContractable = FPC; } 3077 3078 // Get the FP contractability status of this operator. Only meaningful for 3079 // operations on floating point types. 3080 bool isFPContractable() const { return FPContractable; } 3081 3082 protected: 3083 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 3084 ExprValueKind VK, ExprObjectKind OK, 3085 SourceLocation opLoc, bool fpContractable, bool dead2) 3086 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 3087 lhs->isTypeDependent() || rhs->isTypeDependent(), 3088 lhs->isValueDependent() || rhs->isValueDependent(), 3089 (lhs->isInstantiationDependent() || 3090 rhs->isInstantiationDependent()), 3091 (lhs->containsUnexpandedParameterPack() || 3092 rhs->containsUnexpandedParameterPack())), 3093 Opc(opc), FPContractable(fpContractable), OpLoc(opLoc) { 3094 SubExprs[LHS] = lhs; 3095 SubExprs[RHS] = rhs; 3096 } 3097 3098 BinaryOperator(StmtClass SC, EmptyShell Empty) 3099 : Expr(SC, Empty), Opc(BO_MulAssign) { } 3100 }; 3101 3102 /// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 3103 /// track of the type the operation is performed in. Due to the semantics of 3104 /// these operators, the operands are promoted, the arithmetic performed, an 3105 /// implicit conversion back to the result type done, then the assignment takes 3106 /// place. This captures the intermediate type which the computation is done 3107 /// in. 3108 class CompoundAssignOperator : public BinaryOperator { 3109 QualType ComputationLHSType; 3110 QualType ComputationResultType; 3111 public: 3112 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 3113 ExprValueKind VK, ExprObjectKind OK, 3114 QualType CompLHSType, QualType CompResultType, 3115 SourceLocation OpLoc, bool fpContractable) 3116 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, fpContractable, 3117 true), 3118 ComputationLHSType(CompLHSType), 3119 ComputationResultType(CompResultType) { 3120 assert(isCompoundAssignmentOp() && 3121 "Only should be used for compound assignments"); 3122 } 3123 3124 /// \brief Build an empty compound assignment operator expression. 3125 explicit CompoundAssignOperator(EmptyShell Empty) 3126 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 3127 3128 // The two computation types are the type the LHS is converted 3129 // to for the computation and the type of the result; the two are 3130 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 3131 QualType getComputationLHSType() const { return ComputationLHSType; } 3132 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 3133 3134 QualType getComputationResultType() const { return ComputationResultType; } 3135 void setComputationResultType(QualType T) { ComputationResultType = T; } 3136 3137 static bool classof(const Stmt *S) { 3138 return S->getStmtClass() == CompoundAssignOperatorClass; 3139 } 3140 }; 3141 3142 /// AbstractConditionalOperator - An abstract base class for 3143 /// ConditionalOperator and BinaryConditionalOperator. 3144 class AbstractConditionalOperator : public Expr { 3145 SourceLocation QuestionLoc, ColonLoc; 3146 friend class ASTStmtReader; 3147 3148 protected: 3149 AbstractConditionalOperator(StmtClass SC, QualType T, 3150 ExprValueKind VK, ExprObjectKind OK, 3151 bool TD, bool VD, bool ID, 3152 bool ContainsUnexpandedParameterPack, 3153 SourceLocation qloc, 3154 SourceLocation cloc) 3155 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 3156 QuestionLoc(qloc), ColonLoc(cloc) {} 3157 3158 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 3159 : Expr(SC, Empty) { } 3160 3161 public: 3162 // getCond - Return the expression representing the condition for 3163 // the ?: operator. 3164 Expr *getCond() const; 3165 3166 // getTrueExpr - Return the subexpression representing the value of 3167 // the expression if the condition evaluates to true. 3168 Expr *getTrueExpr() const; 3169 3170 // getFalseExpr - Return the subexpression representing the value of 3171 // the expression if the condition evaluates to false. This is 3172 // the same as getRHS. 3173 Expr *getFalseExpr() const; 3174 3175 SourceLocation getQuestionLoc() const { return QuestionLoc; } 3176 SourceLocation getColonLoc() const { return ColonLoc; } 3177 3178 static bool classof(const Stmt *T) { 3179 return T->getStmtClass() == ConditionalOperatorClass || 3180 T->getStmtClass() == BinaryConditionalOperatorClass; 3181 } 3182 }; 3183 3184 /// ConditionalOperator - The ?: ternary operator. The GNU "missing 3185 /// middle" extension is a BinaryConditionalOperator. 3186 class ConditionalOperator : public AbstractConditionalOperator { 3187 enum { COND, LHS, RHS, END_EXPR }; 3188 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3189 3190 friend class ASTStmtReader; 3191 public: 3192 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 3193 SourceLocation CLoc, Expr *rhs, 3194 QualType t, ExprValueKind VK, ExprObjectKind OK) 3195 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 3196 // FIXME: the type of the conditional operator doesn't 3197 // depend on the type of the conditional, but the standard 3198 // seems to imply that it could. File a bug! 3199 (lhs->isTypeDependent() || rhs->isTypeDependent()), 3200 (cond->isValueDependent() || lhs->isValueDependent() || 3201 rhs->isValueDependent()), 3202 (cond->isInstantiationDependent() || 3203 lhs->isInstantiationDependent() || 3204 rhs->isInstantiationDependent()), 3205 (cond->containsUnexpandedParameterPack() || 3206 lhs->containsUnexpandedParameterPack() || 3207 rhs->containsUnexpandedParameterPack()), 3208 QLoc, CLoc) { 3209 SubExprs[COND] = cond; 3210 SubExprs[LHS] = lhs; 3211 SubExprs[RHS] = rhs; 3212 } 3213 3214 /// \brief Build an empty conditional operator. 3215 explicit ConditionalOperator(EmptyShell Empty) 3216 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 3217 3218 // getCond - Return the expression representing the condition for 3219 // the ?: operator. 3220 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3221 3222 // getTrueExpr - Return the subexpression representing the value of 3223 // the expression if the condition evaluates to true. 3224 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3225 3226 // getFalseExpr - Return the subexpression representing the value of 3227 // the expression if the condition evaluates to false. This is 3228 // the same as getRHS. 3229 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3230 3231 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3232 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3233 3234 SourceLocation getLocStart() const LLVM_READONLY { 3235 return getCond()->getLocStart(); 3236 } 3237 SourceLocation getLocEnd() const LLVM_READONLY { 3238 return getRHS()->getLocEnd(); 3239 } 3240 3241 static bool classof(const Stmt *T) { 3242 return T->getStmtClass() == ConditionalOperatorClass; 3243 } 3244 3245 // Iterators 3246 child_range children() { 3247 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3248 } 3249 }; 3250 3251 /// BinaryConditionalOperator - The GNU extension to the conditional 3252 /// operator which allows the middle operand to be omitted. 3253 /// 3254 /// This is a different expression kind on the assumption that almost 3255 /// every client ends up needing to know that these are different. 3256 class BinaryConditionalOperator : public AbstractConditionalOperator { 3257 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3258 3259 /// - the common condition/left-hand-side expression, which will be 3260 /// evaluated as the opaque value 3261 /// - the condition, expressed in terms of the opaque value 3262 /// - the left-hand-side, expressed in terms of the opaque value 3263 /// - the right-hand-side 3264 Stmt *SubExprs[NUM_SUBEXPRS]; 3265 OpaqueValueExpr *OpaqueValue; 3266 3267 friend class ASTStmtReader; 3268 public: 3269 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3270 Expr *cond, Expr *lhs, Expr *rhs, 3271 SourceLocation qloc, SourceLocation cloc, 3272 QualType t, ExprValueKind VK, ExprObjectKind OK) 3273 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3274 (common->isTypeDependent() || rhs->isTypeDependent()), 3275 (common->isValueDependent() || rhs->isValueDependent()), 3276 (common->isInstantiationDependent() || 3277 rhs->isInstantiationDependent()), 3278 (common->containsUnexpandedParameterPack() || 3279 rhs->containsUnexpandedParameterPack()), 3280 qloc, cloc), 3281 OpaqueValue(opaqueValue) { 3282 SubExprs[COMMON] = common; 3283 SubExprs[COND] = cond; 3284 SubExprs[LHS] = lhs; 3285 SubExprs[RHS] = rhs; 3286 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value"); 3287 } 3288 3289 /// \brief Build an empty conditional operator. 3290 explicit BinaryConditionalOperator(EmptyShell Empty) 3291 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3292 3293 /// \brief getCommon - Return the common expression, written to the 3294 /// left of the condition. The opaque value will be bound to the 3295 /// result of this expression. 3296 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3297 3298 /// \brief getOpaqueValue - Return the opaque value placeholder. 3299 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3300 3301 /// \brief getCond - Return the condition expression; this is defined 3302 /// in terms of the opaque value. 3303 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3304 3305 /// \brief getTrueExpr - Return the subexpression which will be 3306 /// evaluated if the condition evaluates to true; this is defined 3307 /// in terms of the opaque value. 3308 Expr *getTrueExpr() const { 3309 return cast<Expr>(SubExprs[LHS]); 3310 } 3311 3312 /// \brief getFalseExpr - Return the subexpression which will be 3313 /// evaluated if the condnition evaluates to false; this is 3314 /// defined in terms of the opaque value. 3315 Expr *getFalseExpr() const { 3316 return cast<Expr>(SubExprs[RHS]); 3317 } 3318 3319 SourceLocation getLocStart() const LLVM_READONLY { 3320 return getCommon()->getLocStart(); 3321 } 3322 SourceLocation getLocEnd() const LLVM_READONLY { 3323 return getFalseExpr()->getLocEnd(); 3324 } 3325 3326 static bool classof(const Stmt *T) { 3327 return T->getStmtClass() == BinaryConditionalOperatorClass; 3328 } 3329 3330 // Iterators 3331 child_range children() { 3332 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3333 } 3334 }; 3335 3336 inline Expr *AbstractConditionalOperator::getCond() const { 3337 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3338 return co->getCond(); 3339 return cast<BinaryConditionalOperator>(this)->getCond(); 3340 } 3341 3342 inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3343 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3344 return co->getTrueExpr(); 3345 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3346 } 3347 3348 inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3349 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3350 return co->getFalseExpr(); 3351 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3352 } 3353 3354 /// AddrLabelExpr - The GNU address of label extension, representing &&label. 3355 class AddrLabelExpr : public Expr { 3356 SourceLocation AmpAmpLoc, LabelLoc; 3357 LabelDecl *Label; 3358 public: 3359 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3360 QualType t) 3361 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3362 false), 3363 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3364 3365 /// \brief Build an empty address of a label expression. 3366 explicit AddrLabelExpr(EmptyShell Empty) 3367 : Expr(AddrLabelExprClass, Empty) { } 3368 3369 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3370 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3371 SourceLocation getLabelLoc() const { return LabelLoc; } 3372 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3373 3374 SourceLocation getLocStart() const LLVM_READONLY { return AmpAmpLoc; } 3375 SourceLocation getLocEnd() const LLVM_READONLY { return LabelLoc; } 3376 3377 LabelDecl *getLabel() const { return Label; } 3378 void setLabel(LabelDecl *L) { Label = L; } 3379 3380 static bool classof(const Stmt *T) { 3381 return T->getStmtClass() == AddrLabelExprClass; 3382 } 3383 3384 // Iterators 3385 child_range children() { return child_range(); } 3386 }; 3387 3388 /// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3389 /// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3390 /// takes the value of the last subexpression. 3391 /// 3392 /// A StmtExpr is always an r-value; values "returned" out of a 3393 /// StmtExpr will be copied. 3394 class StmtExpr : public Expr { 3395 Stmt *SubStmt; 3396 SourceLocation LParenLoc, RParenLoc; 3397 public: 3398 // FIXME: Does type-dependence need to be computed differently? 3399 // FIXME: Do we need to compute instantiation instantiation-dependence for 3400 // statements? (ugh!) 3401 StmtExpr(CompoundStmt *substmt, QualType T, 3402 SourceLocation lp, SourceLocation rp) : 3403 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3404 T->isDependentType(), false, false, false), 3405 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3406 3407 /// \brief Build an empty statement expression. 3408 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3409 3410 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3411 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3412 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3413 3414 SourceLocation getLocStart() const LLVM_READONLY { return LParenLoc; } 3415 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3416 3417 SourceLocation getLParenLoc() const { return LParenLoc; } 3418 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3419 SourceLocation getRParenLoc() const { return RParenLoc; } 3420 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3421 3422 static bool classof(const Stmt *T) { 3423 return T->getStmtClass() == StmtExprClass; 3424 } 3425 3426 // Iterators 3427 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3428 }; 3429 3430 3431 /// ShuffleVectorExpr - clang-specific builtin-in function 3432 /// __builtin_shufflevector. 3433 /// This AST node represents a operator that does a constant 3434 /// shuffle, similar to LLVM's shufflevector instruction. It takes 3435 /// two vectors and a variable number of constant indices, 3436 /// and returns the appropriately shuffled vector. 3437 class ShuffleVectorExpr : public Expr { 3438 SourceLocation BuiltinLoc, RParenLoc; 3439 3440 // SubExprs - the list of values passed to the __builtin_shufflevector 3441 // function. The first two are vectors, and the rest are constant 3442 // indices. The number of values in this list is always 3443 // 2+the number of indices in the vector type. 3444 Stmt **SubExprs; 3445 unsigned NumExprs; 3446 3447 public: 3448 ShuffleVectorExpr(const ASTContext &C, ArrayRef<Expr*> args, QualType Type, 3449 SourceLocation BLoc, SourceLocation RP); 3450 3451 /// \brief Build an empty vector-shuffle expression. 3452 explicit ShuffleVectorExpr(EmptyShell Empty) 3453 : Expr(ShuffleVectorExprClass, Empty), SubExprs(nullptr) { } 3454 3455 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3456 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3457 3458 SourceLocation getRParenLoc() const { return RParenLoc; } 3459 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3460 3461 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3462 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3463 3464 static bool classof(const Stmt *T) { 3465 return T->getStmtClass() == ShuffleVectorExprClass; 3466 } 3467 3468 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3469 /// constant expression, the actual arguments passed in, and the function 3470 /// pointers. 3471 unsigned getNumSubExprs() const { return NumExprs; } 3472 3473 /// \brief Retrieve the array of expressions. 3474 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3475 3476 /// getExpr - Return the Expr at the specified index. 3477 Expr *getExpr(unsigned Index) { 3478 assert((Index < NumExprs) && "Arg access out of range!"); 3479 return cast<Expr>(SubExprs[Index]); 3480 } 3481 const Expr *getExpr(unsigned Index) const { 3482 assert((Index < NumExprs) && "Arg access out of range!"); 3483 return cast<Expr>(SubExprs[Index]); 3484 } 3485 3486 void setExprs(const ASTContext &C, ArrayRef<Expr *> Exprs); 3487 3488 llvm::APSInt getShuffleMaskIdx(const ASTContext &Ctx, unsigned N) const { 3489 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3490 return getExpr(N+2)->EvaluateKnownConstInt(Ctx); 3491 } 3492 3493 // Iterators 3494 child_range children() { 3495 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3496 } 3497 }; 3498 3499 /// ConvertVectorExpr - Clang builtin function __builtin_convertvector 3500 /// This AST node provides support for converting a vector type to another 3501 /// vector type of the same arity. 3502 class ConvertVectorExpr : public Expr { 3503 private: 3504 Stmt *SrcExpr; 3505 TypeSourceInfo *TInfo; 3506 SourceLocation BuiltinLoc, RParenLoc; 3507 3508 friend class ASTReader; 3509 friend class ASTStmtReader; 3510 explicit ConvertVectorExpr(EmptyShell Empty) : Expr(ConvertVectorExprClass, Empty) {} 3511 3512 public: 3513 ConvertVectorExpr(Expr* SrcExpr, TypeSourceInfo *TI, QualType DstType, 3514 ExprValueKind VK, ExprObjectKind OK, 3515 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 3516 : Expr(ConvertVectorExprClass, DstType, VK, OK, 3517 DstType->isDependentType(), 3518 DstType->isDependentType() || SrcExpr->isValueDependent(), 3519 (DstType->isInstantiationDependentType() || 3520 SrcExpr->isInstantiationDependent()), 3521 (DstType->containsUnexpandedParameterPack() || 3522 SrcExpr->containsUnexpandedParameterPack())), 3523 SrcExpr(SrcExpr), TInfo(TI), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 3524 3525 /// getSrcExpr - Return the Expr to be converted. 3526 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 3527 3528 /// getTypeSourceInfo - Return the destination type. 3529 TypeSourceInfo *getTypeSourceInfo() const { 3530 return TInfo; 3531 } 3532 void setTypeSourceInfo(TypeSourceInfo *ti) { 3533 TInfo = ti; 3534 } 3535 3536 /// getBuiltinLoc - Return the location of the __builtin_convertvector token. 3537 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3538 3539 /// getRParenLoc - Return the location of final right parenthesis. 3540 SourceLocation getRParenLoc() const { return RParenLoc; } 3541 3542 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3543 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3544 3545 static bool classof(const Stmt *T) { 3546 return T->getStmtClass() == ConvertVectorExprClass; 3547 } 3548 3549 // Iterators 3550 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 3551 }; 3552 3553 /// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3554 /// This AST node is similar to the conditional operator (?:) in C, with 3555 /// the following exceptions: 3556 /// - the test expression must be a integer constant expression. 3557 /// - the expression returned acts like the chosen subexpression in every 3558 /// visible way: the type is the same as that of the chosen subexpression, 3559 /// and all predicates (whether it's an l-value, whether it's an integer 3560 /// constant expression, etc.) return the same result as for the chosen 3561 /// sub-expression. 3562 class ChooseExpr : public Expr { 3563 enum { COND, LHS, RHS, END_EXPR }; 3564 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3565 SourceLocation BuiltinLoc, RParenLoc; 3566 bool CondIsTrue; 3567 public: 3568 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3569 QualType t, ExprValueKind VK, ExprObjectKind OK, 3570 SourceLocation RP, bool condIsTrue, 3571 bool TypeDependent, bool ValueDependent) 3572 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3573 (cond->isInstantiationDependent() || 3574 lhs->isInstantiationDependent() || 3575 rhs->isInstantiationDependent()), 3576 (cond->containsUnexpandedParameterPack() || 3577 lhs->containsUnexpandedParameterPack() || 3578 rhs->containsUnexpandedParameterPack())), 3579 BuiltinLoc(BLoc), RParenLoc(RP), CondIsTrue(condIsTrue) { 3580 SubExprs[COND] = cond; 3581 SubExprs[LHS] = lhs; 3582 SubExprs[RHS] = rhs; 3583 } 3584 3585 /// \brief Build an empty __builtin_choose_expr. 3586 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3587 3588 /// isConditionTrue - Return whether the condition is true (i.e. not 3589 /// equal to zero). 3590 bool isConditionTrue() const { 3591 assert(!isConditionDependent() && 3592 "Dependent condition isn't true or false"); 3593 return CondIsTrue; 3594 } 3595 void setIsConditionTrue(bool isTrue) { CondIsTrue = isTrue; } 3596 3597 bool isConditionDependent() const { 3598 return getCond()->isTypeDependent() || getCond()->isValueDependent(); 3599 } 3600 3601 /// getChosenSubExpr - Return the subexpression chosen according to the 3602 /// condition. 3603 Expr *getChosenSubExpr() const { 3604 return isConditionTrue() ? getLHS() : getRHS(); 3605 } 3606 3607 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3608 void setCond(Expr *E) { SubExprs[COND] = E; } 3609 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3610 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3611 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3612 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3613 3614 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3615 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3616 3617 SourceLocation getRParenLoc() const { return RParenLoc; } 3618 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3619 3620 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3621 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3622 3623 static bool classof(const Stmt *T) { 3624 return T->getStmtClass() == ChooseExprClass; 3625 } 3626 3627 // Iterators 3628 child_range children() { 3629 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3630 } 3631 }; 3632 3633 /// GNUNullExpr - Implements the GNU __null extension, which is a name 3634 /// for a null pointer constant that has integral type (e.g., int or 3635 /// long) and is the same size and alignment as a pointer. The __null 3636 /// extension is typically only used by system headers, which define 3637 /// NULL as __null in C++ rather than using 0 (which is an integer 3638 /// that may not match the size of a pointer). 3639 class GNUNullExpr : public Expr { 3640 /// TokenLoc - The location of the __null keyword. 3641 SourceLocation TokenLoc; 3642 3643 public: 3644 GNUNullExpr(QualType Ty, SourceLocation Loc) 3645 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3646 false), 3647 TokenLoc(Loc) { } 3648 3649 /// \brief Build an empty GNU __null expression. 3650 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3651 3652 /// getTokenLocation - The location of the __null token. 3653 SourceLocation getTokenLocation() const { return TokenLoc; } 3654 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3655 3656 SourceLocation getLocStart() const LLVM_READONLY { return TokenLoc; } 3657 SourceLocation getLocEnd() const LLVM_READONLY { return TokenLoc; } 3658 3659 static bool classof(const Stmt *T) { 3660 return T->getStmtClass() == GNUNullExprClass; 3661 } 3662 3663 // Iterators 3664 child_range children() { return child_range(); } 3665 }; 3666 3667 /// VAArgExpr, used for the builtin function __builtin_va_arg. 3668 class VAArgExpr : public Expr { 3669 Stmt *Val; 3670 TypeSourceInfo *TInfo; 3671 SourceLocation BuiltinLoc, RParenLoc; 3672 public: 3673 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3674 SourceLocation RPLoc, QualType t) 3675 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3676 t->isDependentType(), false, 3677 (TInfo->getType()->isInstantiationDependentType() || 3678 e->isInstantiationDependent()), 3679 (TInfo->getType()->containsUnexpandedParameterPack() || 3680 e->containsUnexpandedParameterPack())), 3681 Val(e), TInfo(TInfo), 3682 BuiltinLoc(BLoc), 3683 RParenLoc(RPLoc) { } 3684 3685 /// \brief Create an empty __builtin_va_arg expression. 3686 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3687 3688 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3689 Expr *getSubExpr() { return cast<Expr>(Val); } 3690 void setSubExpr(Expr *E) { Val = E; } 3691 3692 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3693 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3694 3695 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3696 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3697 3698 SourceLocation getRParenLoc() const { return RParenLoc; } 3699 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3700 3701 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3702 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3703 3704 static bool classof(const Stmt *T) { 3705 return T->getStmtClass() == VAArgExprClass; 3706 } 3707 3708 // Iterators 3709 child_range children() { return child_range(&Val, &Val+1); } 3710 }; 3711 3712 /// @brief Describes an C or C++ initializer list. 3713 /// 3714 /// InitListExpr describes an initializer list, which can be used to 3715 /// initialize objects of different types, including 3716 /// struct/class/union types, arrays, and vectors. For example: 3717 /// 3718 /// @code 3719 /// struct foo x = { 1, { 2, 3 } }; 3720 /// @endcode 3721 /// 3722 /// Prior to semantic analysis, an initializer list will represent the 3723 /// initializer list as written by the user, but will have the 3724 /// placeholder type "void". This initializer list is called the 3725 /// syntactic form of the initializer, and may contain C99 designated 3726 /// initializers (represented as DesignatedInitExprs), initializations 3727 /// of subobject members without explicit braces, and so on. Clients 3728 /// interested in the original syntax of the initializer list should 3729 /// use the syntactic form of the initializer list. 3730 /// 3731 /// After semantic analysis, the initializer list will represent the 3732 /// semantic form of the initializer, where the initializations of all 3733 /// subobjects are made explicit with nested InitListExpr nodes and 3734 /// C99 designators have been eliminated by placing the designated 3735 /// initializations into the subobject they initialize. Additionally, 3736 /// any "holes" in the initialization, where no initializer has been 3737 /// specified for a particular subobject, will be replaced with 3738 /// implicitly-generated ImplicitValueInitExpr expressions that 3739 /// value-initialize the subobjects. Note, however, that the 3740 /// initializer lists may still have fewer initializers than there are 3741 /// elements to initialize within the object. 3742 /// 3743 /// After semantic analysis has completed, given an initializer list, 3744 /// method isSemanticForm() returns true if and only if this is the 3745 /// semantic form of the initializer list (note: the same AST node 3746 /// may at the same time be the syntactic form). 3747 /// Given the semantic form of the initializer list, one can retrieve 3748 /// the syntactic form of that initializer list (when different) 3749 /// using method getSyntacticForm(); the method returns null if applied 3750 /// to a initializer list which is already in syntactic form. 3751 /// Similarly, given the syntactic form (i.e., an initializer list such 3752 /// that isSemanticForm() returns false), one can retrieve the semantic 3753 /// form using method getSemanticForm(). 3754 /// Since many initializer lists have the same syntactic and semantic forms, 3755 /// getSyntacticForm() may return NULL, indicating that the current 3756 /// semantic initializer list also serves as its syntactic form. 3757 class InitListExpr : public Expr { 3758 // FIXME: Eliminate this vector in favor of ASTContext allocation 3759 typedef ASTVector<Stmt *> InitExprsTy; 3760 InitExprsTy InitExprs; 3761 SourceLocation LBraceLoc, RBraceLoc; 3762 3763 /// The alternative form of the initializer list (if it exists). 3764 /// The int part of the pair stores whether this initializer list is 3765 /// in semantic form. If not null, the pointer points to: 3766 /// - the syntactic form, if this is in semantic form; 3767 /// - the semantic form, if this is in syntactic form. 3768 llvm::PointerIntPair<InitListExpr *, 1, bool> AltForm; 3769 3770 /// \brief Either: 3771 /// If this initializer list initializes an array with more elements than 3772 /// there are initializers in the list, specifies an expression to be used 3773 /// for value initialization of the rest of the elements. 3774 /// Or 3775 /// If this initializer list initializes a union, specifies which 3776 /// field within the union will be initialized. 3777 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3778 3779 public: 3780 InitListExpr(const ASTContext &C, SourceLocation lbraceloc, 3781 ArrayRef<Expr*> initExprs, SourceLocation rbraceloc); 3782 3783 /// \brief Build an empty initializer list. 3784 explicit InitListExpr(EmptyShell Empty) 3785 : Expr(InitListExprClass, Empty) { } 3786 3787 unsigned getNumInits() const { return InitExprs.size(); } 3788 3789 /// \brief Retrieve the set of initializers. 3790 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3791 3792 const Expr *getInit(unsigned Init) const { 3793 assert(Init < getNumInits() && "Initializer access out of range!"); 3794 return cast_or_null<Expr>(InitExprs[Init]); 3795 } 3796 3797 Expr *getInit(unsigned Init) { 3798 assert(Init < getNumInits() && "Initializer access out of range!"); 3799 return cast_or_null<Expr>(InitExprs[Init]); 3800 } 3801 3802 void setInit(unsigned Init, Expr *expr) { 3803 assert(Init < getNumInits() && "Initializer access out of range!"); 3804 InitExprs[Init] = expr; 3805 3806 if (expr) { 3807 ExprBits.TypeDependent |= expr->isTypeDependent(); 3808 ExprBits.ValueDependent |= expr->isValueDependent(); 3809 ExprBits.InstantiationDependent |= expr->isInstantiationDependent(); 3810 ExprBits.ContainsUnexpandedParameterPack |= 3811 expr->containsUnexpandedParameterPack(); 3812 } 3813 } 3814 3815 /// \brief Reserve space for some number of initializers. 3816 void reserveInits(const ASTContext &C, unsigned NumInits); 3817 3818 /// @brief Specify the number of initializers 3819 /// 3820 /// If there are more than @p NumInits initializers, the remaining 3821 /// initializers will be destroyed. If there are fewer than @p 3822 /// NumInits initializers, NULL expressions will be added for the 3823 /// unknown initializers. 3824 void resizeInits(const ASTContext &Context, unsigned NumInits); 3825 3826 /// @brief Updates the initializer at index @p Init with the new 3827 /// expression @p expr, and returns the old expression at that 3828 /// location. 3829 /// 3830 /// When @p Init is out of range for this initializer list, the 3831 /// initializer list will be extended with NULL expressions to 3832 /// accommodate the new entry. 3833 Expr *updateInit(const ASTContext &C, unsigned Init, Expr *expr); 3834 3835 /// \brief If this initializer list initializes an array with more elements 3836 /// than there are initializers in the list, specifies an expression to be 3837 /// used for value initialization of the rest of the elements. 3838 Expr *getArrayFiller() { 3839 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3840 } 3841 const Expr *getArrayFiller() const { 3842 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3843 } 3844 void setArrayFiller(Expr *filler); 3845 3846 /// \brief Return true if this is an array initializer and its array "filler" 3847 /// has been set. 3848 bool hasArrayFiller() const { return getArrayFiller(); } 3849 3850 /// \brief If this initializes a union, specifies which field in the 3851 /// union to initialize. 3852 /// 3853 /// Typically, this field is the first named field within the 3854 /// union. However, a designated initializer can specify the 3855 /// initialization of a different field within the union. 3856 FieldDecl *getInitializedFieldInUnion() { 3857 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3858 } 3859 const FieldDecl *getInitializedFieldInUnion() const { 3860 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3861 } 3862 void setInitializedFieldInUnion(FieldDecl *FD) { 3863 assert((FD == nullptr 3864 || getInitializedFieldInUnion() == nullptr 3865 || getInitializedFieldInUnion() == FD) 3866 && "Only one field of a union may be initialized at a time!"); 3867 ArrayFillerOrUnionFieldInit = FD; 3868 } 3869 3870 // Explicit InitListExpr's originate from source code (and have valid source 3871 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3872 bool isExplicit() { 3873 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3874 } 3875 3876 // Is this an initializer for an array of characters, initialized by a string 3877 // literal or an @encode? 3878 bool isStringLiteralInit() const; 3879 3880 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3881 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3882 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3883 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3884 3885 bool isSemanticForm() const { return AltForm.getInt(); } 3886 InitListExpr *getSemanticForm() const { 3887 return isSemanticForm() ? nullptr : AltForm.getPointer(); 3888 } 3889 InitListExpr *getSyntacticForm() const { 3890 return isSemanticForm() ? AltForm.getPointer() : nullptr; 3891 } 3892 3893 void setSyntacticForm(InitListExpr *Init) { 3894 AltForm.setPointer(Init); 3895 AltForm.setInt(true); 3896 Init->AltForm.setPointer(this); 3897 Init->AltForm.setInt(false); 3898 } 3899 3900 bool hadArrayRangeDesignator() const { 3901 return InitListExprBits.HadArrayRangeDesignator != 0; 3902 } 3903 void sawArrayRangeDesignator(bool ARD = true) { 3904 InitListExprBits.HadArrayRangeDesignator = ARD; 3905 } 3906 3907 SourceLocation getLocStart() const LLVM_READONLY; 3908 SourceLocation getLocEnd() const LLVM_READONLY; 3909 3910 static bool classof(const Stmt *T) { 3911 return T->getStmtClass() == InitListExprClass; 3912 } 3913 3914 // Iterators 3915 child_range children() { 3916 // FIXME: This does not include the array filler expression. 3917 if (InitExprs.empty()) return child_range(); 3918 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3919 } 3920 3921 typedef InitExprsTy::iterator iterator; 3922 typedef InitExprsTy::const_iterator const_iterator; 3923 typedef InitExprsTy::reverse_iterator reverse_iterator; 3924 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3925 3926 iterator begin() { return InitExprs.begin(); } 3927 const_iterator begin() const { return InitExprs.begin(); } 3928 iterator end() { return InitExprs.end(); } 3929 const_iterator end() const { return InitExprs.end(); } 3930 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3931 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3932 reverse_iterator rend() { return InitExprs.rend(); } 3933 const_reverse_iterator rend() const { return InitExprs.rend(); } 3934 3935 friend class ASTStmtReader; 3936 friend class ASTStmtWriter; 3937 }; 3938 3939 /// @brief Represents a C99 designated initializer expression. 3940 /// 3941 /// A designated initializer expression (C99 6.7.8) contains one or 3942 /// more designators (which can be field designators, array 3943 /// designators, or GNU array-range designators) followed by an 3944 /// expression that initializes the field or element(s) that the 3945 /// designators refer to. For example, given: 3946 /// 3947 /// @code 3948 /// struct point { 3949 /// double x; 3950 /// double y; 3951 /// }; 3952 /// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3953 /// @endcode 3954 /// 3955 /// The InitListExpr contains three DesignatedInitExprs, the first of 3956 /// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3957 /// designators, one array designator for @c [2] followed by one field 3958 /// designator for @c .y. The initialization expression will be 1.0. 3959 class DesignatedInitExpr : public Expr { 3960 public: 3961 /// \brief Forward declaration of the Designator class. 3962 class Designator; 3963 3964 private: 3965 /// The location of the '=' or ':' prior to the actual initializer 3966 /// expression. 3967 SourceLocation EqualOrColonLoc; 3968 3969 /// Whether this designated initializer used the GNU deprecated 3970 /// syntax rather than the C99 '=' syntax. 3971 bool GNUSyntax : 1; 3972 3973 /// The number of designators in this initializer expression. 3974 unsigned NumDesignators : 15; 3975 3976 /// The number of subexpressions of this initializer expression, 3977 /// which contains both the initializer and any additional 3978 /// expressions used by array and array-range designators. 3979 unsigned NumSubExprs : 16; 3980 3981 /// \brief The designators in this designated initialization 3982 /// expression. 3983 Designator *Designators; 3984 3985 3986 DesignatedInitExpr(const ASTContext &C, QualType Ty, unsigned NumDesignators, 3987 const Designator *Designators, 3988 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3989 ArrayRef<Expr*> IndexExprs, Expr *Init); 3990 3991 explicit DesignatedInitExpr(unsigned NumSubExprs) 3992 : Expr(DesignatedInitExprClass, EmptyShell()), 3993 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(nullptr) { } 3994 3995 public: 3996 /// A field designator, e.g., ".x". 3997 struct FieldDesignator { 3998 /// Refers to the field that is being initialized. The low bit 3999 /// of this field determines whether this is actually a pointer 4000 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 4001 /// initially constructed, a field designator will store an 4002 /// IdentifierInfo*. After semantic analysis has resolved that 4003 /// name, the field designator will instead store a FieldDecl*. 4004 uintptr_t NameOrField; 4005 4006 /// The location of the '.' in the designated initializer. 4007 unsigned DotLoc; 4008 4009 /// The location of the field name in the designated initializer. 4010 unsigned FieldLoc; 4011 }; 4012 4013 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 4014 struct ArrayOrRangeDesignator { 4015 /// Location of the first index expression within the designated 4016 /// initializer expression's list of subexpressions. 4017 unsigned Index; 4018 /// The location of the '[' starting the array range designator. 4019 unsigned LBracketLoc; 4020 /// The location of the ellipsis separating the start and end 4021 /// indices. Only valid for GNU array-range designators. 4022 unsigned EllipsisLoc; 4023 /// The location of the ']' terminating the array range designator. 4024 unsigned RBracketLoc; 4025 }; 4026 4027 /// @brief Represents a single C99 designator. 4028 /// 4029 /// @todo This class is infuriatingly similar to clang::Designator, 4030 /// but minor differences (storing indices vs. storing pointers) 4031 /// keep us from reusing it. Try harder, later, to rectify these 4032 /// differences. 4033 class Designator { 4034 /// @brief The kind of designator this describes. 4035 enum { 4036 FieldDesignator, 4037 ArrayDesignator, 4038 ArrayRangeDesignator 4039 } Kind; 4040 4041 union { 4042 /// A field designator, e.g., ".x". 4043 struct FieldDesignator Field; 4044 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 4045 struct ArrayOrRangeDesignator ArrayOrRange; 4046 }; 4047 friend class DesignatedInitExpr; 4048 4049 public: 4050 Designator() {} 4051 4052 /// @brief Initializes a field designator. 4053 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 4054 SourceLocation FieldLoc) 4055 : Kind(FieldDesignator) { 4056 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 4057 Field.DotLoc = DotLoc.getRawEncoding(); 4058 Field.FieldLoc = FieldLoc.getRawEncoding(); 4059 } 4060 4061 /// @brief Initializes an array designator. 4062 Designator(unsigned Index, SourceLocation LBracketLoc, 4063 SourceLocation RBracketLoc) 4064 : Kind(ArrayDesignator) { 4065 ArrayOrRange.Index = Index; 4066 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 4067 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 4068 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 4069 } 4070 4071 /// @brief Initializes a GNU array-range designator. 4072 Designator(unsigned Index, SourceLocation LBracketLoc, 4073 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 4074 : Kind(ArrayRangeDesignator) { 4075 ArrayOrRange.Index = Index; 4076 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 4077 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 4078 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 4079 } 4080 4081 bool isFieldDesignator() const { return Kind == FieldDesignator; } 4082 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 4083 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 4084 4085 IdentifierInfo *getFieldName() const; 4086 4087 FieldDecl *getField() const { 4088 assert(Kind == FieldDesignator && "Only valid on a field designator"); 4089 if (Field.NameOrField & 0x01) 4090 return nullptr; 4091 else 4092 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 4093 } 4094 4095 void setField(FieldDecl *FD) { 4096 assert(Kind == FieldDesignator && "Only valid on a field designator"); 4097 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 4098 } 4099 4100 SourceLocation getDotLoc() const { 4101 assert(Kind == FieldDesignator && "Only valid on a field designator"); 4102 return SourceLocation::getFromRawEncoding(Field.DotLoc); 4103 } 4104 4105 SourceLocation getFieldLoc() const { 4106 assert(Kind == FieldDesignator && "Only valid on a field designator"); 4107 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 4108 } 4109 4110 SourceLocation getLBracketLoc() const { 4111 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 4112 "Only valid on an array or array-range designator"); 4113 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 4114 } 4115 4116 SourceLocation getRBracketLoc() const { 4117 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 4118 "Only valid on an array or array-range designator"); 4119 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 4120 } 4121 4122 SourceLocation getEllipsisLoc() const { 4123 assert(Kind == ArrayRangeDesignator && 4124 "Only valid on an array-range designator"); 4125 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 4126 } 4127 4128 unsigned getFirstExprIndex() const { 4129 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 4130 "Only valid on an array or array-range designator"); 4131 return ArrayOrRange.Index; 4132 } 4133 4134 SourceLocation getLocStart() const LLVM_READONLY { 4135 if (Kind == FieldDesignator) 4136 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 4137 else 4138 return getLBracketLoc(); 4139 } 4140 SourceLocation getLocEnd() const LLVM_READONLY { 4141 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 4142 } 4143 SourceRange getSourceRange() const LLVM_READONLY { 4144 return SourceRange(getLocStart(), getLocEnd()); 4145 } 4146 }; 4147 4148 static DesignatedInitExpr *Create(const ASTContext &C, 4149 Designator *Designators, 4150 unsigned NumDesignators, 4151 ArrayRef<Expr*> IndexExprs, 4152 SourceLocation EqualOrColonLoc, 4153 bool GNUSyntax, Expr *Init); 4154 4155 static DesignatedInitExpr *CreateEmpty(const ASTContext &C, 4156 unsigned NumIndexExprs); 4157 4158 /// @brief Returns the number of designators in this initializer. 4159 unsigned size() const { return NumDesignators; } 4160 4161 // Iterator access to the designators. 4162 typedef Designator *designators_iterator; 4163 designators_iterator designators_begin() { return Designators; } 4164 designators_iterator designators_end() { 4165 return Designators + NumDesignators; 4166 } 4167 4168 typedef const Designator *const_designators_iterator; 4169 const_designators_iterator designators_begin() const { return Designators; } 4170 const_designators_iterator designators_end() const { 4171 return Designators + NumDesignators; 4172 } 4173 4174 typedef llvm::iterator_range<designators_iterator> designators_range; 4175 designators_range designators() { 4176 return designators_range(designators_begin(), designators_end()); 4177 } 4178 4179 typedef llvm::iterator_range<const_designators_iterator> 4180 designators_const_range; 4181 designators_const_range designators() const { 4182 return designators_const_range(designators_begin(), designators_end()); 4183 } 4184 4185 typedef std::reverse_iterator<designators_iterator> 4186 reverse_designators_iterator; 4187 reverse_designators_iterator designators_rbegin() { 4188 return reverse_designators_iterator(designators_end()); 4189 } 4190 reverse_designators_iterator designators_rend() { 4191 return reverse_designators_iterator(designators_begin()); 4192 } 4193 4194 typedef std::reverse_iterator<const_designators_iterator> 4195 const_reverse_designators_iterator; 4196 const_reverse_designators_iterator designators_rbegin() const { 4197 return const_reverse_designators_iterator(designators_end()); 4198 } 4199 const_reverse_designators_iterator designators_rend() const { 4200 return const_reverse_designators_iterator(designators_begin()); 4201 } 4202 4203 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 4204 4205 void setDesignators(const ASTContext &C, const Designator *Desigs, 4206 unsigned NumDesigs); 4207 4208 Expr *getArrayIndex(const Designator &D) const; 4209 Expr *getArrayRangeStart(const Designator &D) const; 4210 Expr *getArrayRangeEnd(const Designator &D) const; 4211 4212 /// @brief Retrieve the location of the '=' that precedes the 4213 /// initializer value itself, if present. 4214 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 4215 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 4216 4217 /// @brief Determines whether this designated initializer used the 4218 /// deprecated GNU syntax for designated initializers. 4219 bool usesGNUSyntax() const { return GNUSyntax; } 4220 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 4221 4222 /// @brief Retrieve the initializer value. 4223 Expr *getInit() const { 4224 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 4225 } 4226 4227 void setInit(Expr *init) { 4228 *child_begin() = init; 4229 } 4230 4231 /// \brief Retrieve the total number of subexpressions in this 4232 /// designated initializer expression, including the actual 4233 /// initialized value and any expressions that occur within array 4234 /// and array-range designators. 4235 unsigned getNumSubExprs() const { return NumSubExprs; } 4236 4237 Expr *getSubExpr(unsigned Idx) const { 4238 assert(Idx < NumSubExprs && "Subscript out of range"); 4239 return cast<Expr>(reinterpret_cast<Stmt *const *>(this + 1)[Idx]); 4240 } 4241 4242 void setSubExpr(unsigned Idx, Expr *E) { 4243 assert(Idx < NumSubExprs && "Subscript out of range"); 4244 reinterpret_cast<Stmt **>(this + 1)[Idx] = E; 4245 } 4246 4247 /// \brief Replaces the designator at index @p Idx with the series 4248 /// of designators in [First, Last). 4249 void ExpandDesignator(const ASTContext &C, unsigned Idx, 4250 const Designator *First, const Designator *Last); 4251 4252 SourceRange getDesignatorsSourceRange() const; 4253 4254 SourceLocation getLocStart() const LLVM_READONLY; 4255 SourceLocation getLocEnd() const LLVM_READONLY; 4256 4257 static bool classof(const Stmt *T) { 4258 return T->getStmtClass() == DesignatedInitExprClass; 4259 } 4260 4261 // Iterators 4262 child_range children() { 4263 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 4264 return child_range(begin, begin + NumSubExprs); 4265 } 4266 }; 4267 4268 /// \brief Represents an implicitly-generated value initialization of 4269 /// an object of a given type. 4270 /// 4271 /// Implicit value initializations occur within semantic initializer 4272 /// list expressions (InitListExpr) as placeholders for subobject 4273 /// initializations not explicitly specified by the user. 4274 /// 4275 /// \see InitListExpr 4276 class ImplicitValueInitExpr : public Expr { 4277 public: 4278 explicit ImplicitValueInitExpr(QualType ty) 4279 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 4280 false, false, ty->isInstantiationDependentType(), false) { } 4281 4282 /// \brief Construct an empty implicit value initialization. 4283 explicit ImplicitValueInitExpr(EmptyShell Empty) 4284 : Expr(ImplicitValueInitExprClass, Empty) { } 4285 4286 static bool classof(const Stmt *T) { 4287 return T->getStmtClass() == ImplicitValueInitExprClass; 4288 } 4289 4290 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); } 4291 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); } 4292 4293 // Iterators 4294 child_range children() { return child_range(); } 4295 }; 4296 4297 4298 class ParenListExpr : public Expr { 4299 Stmt **Exprs; 4300 unsigned NumExprs; 4301 SourceLocation LParenLoc, RParenLoc; 4302 4303 public: 4304 ParenListExpr(const ASTContext& C, SourceLocation lparenloc, 4305 ArrayRef<Expr*> exprs, SourceLocation rparenloc); 4306 4307 /// \brief Build an empty paren list. 4308 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 4309 4310 unsigned getNumExprs() const { return NumExprs; } 4311 4312 const Expr* getExpr(unsigned Init) const { 4313 assert(Init < getNumExprs() && "Initializer access out of range!"); 4314 return cast_or_null<Expr>(Exprs[Init]); 4315 } 4316 4317 Expr* getExpr(unsigned Init) { 4318 assert(Init < getNumExprs() && "Initializer access out of range!"); 4319 return cast_or_null<Expr>(Exprs[Init]); 4320 } 4321 4322 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 4323 4324 SourceLocation getLParenLoc() const { return LParenLoc; } 4325 SourceLocation getRParenLoc() const { return RParenLoc; } 4326 4327 SourceLocation getLocStart() const LLVM_READONLY { return LParenLoc; } 4328 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4329 4330 static bool classof(const Stmt *T) { 4331 return T->getStmtClass() == ParenListExprClass; 4332 } 4333 4334 // Iterators 4335 child_range children() { 4336 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4337 } 4338 4339 friend class ASTStmtReader; 4340 friend class ASTStmtWriter; 4341 }; 4342 4343 4344 /// \brief Represents a C11 generic selection. 4345 /// 4346 /// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4347 /// expression, followed by one or more generic associations. Each generic 4348 /// association specifies a type name and an expression, or "default" and an 4349 /// expression (in which case it is known as a default generic association). 4350 /// The type and value of the generic selection are identical to those of its 4351 /// result expression, which is defined as the expression in the generic 4352 /// association with a type name that is compatible with the type of the 4353 /// controlling expression, or the expression in the default generic association 4354 /// if no types are compatible. For example: 4355 /// 4356 /// @code 4357 /// _Generic(X, double: 1, float: 2, default: 3) 4358 /// @endcode 4359 /// 4360 /// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4361 /// or 3 if "hello". 4362 /// 4363 /// As an extension, generic selections are allowed in C++, where the following 4364 /// additional semantics apply: 4365 /// 4366 /// Any generic selection whose controlling expression is type-dependent or 4367 /// which names a dependent type in its association list is result-dependent, 4368 /// which means that the choice of result expression is dependent. 4369 /// Result-dependent generic associations are both type- and value-dependent. 4370 class GenericSelectionExpr : public Expr { 4371 enum { CONTROLLING, END_EXPR }; 4372 TypeSourceInfo **AssocTypes; 4373 Stmt **SubExprs; 4374 unsigned NumAssocs, ResultIndex; 4375 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4376 4377 public: 4378 GenericSelectionExpr(const ASTContext &Context, 4379 SourceLocation GenericLoc, Expr *ControllingExpr, 4380 ArrayRef<TypeSourceInfo*> AssocTypes, 4381 ArrayRef<Expr*> AssocExprs, 4382 SourceLocation DefaultLoc, SourceLocation RParenLoc, 4383 bool ContainsUnexpandedParameterPack, 4384 unsigned ResultIndex); 4385 4386 /// This constructor is used in the result-dependent case. 4387 GenericSelectionExpr(const ASTContext &Context, 4388 SourceLocation GenericLoc, Expr *ControllingExpr, 4389 ArrayRef<TypeSourceInfo*> AssocTypes, 4390 ArrayRef<Expr*> AssocExprs, 4391 SourceLocation DefaultLoc, SourceLocation RParenLoc, 4392 bool ContainsUnexpandedParameterPack); 4393 4394 explicit GenericSelectionExpr(EmptyShell Empty) 4395 : Expr(GenericSelectionExprClass, Empty) { } 4396 4397 unsigned getNumAssocs() const { return NumAssocs; } 4398 4399 SourceLocation getGenericLoc() const { return GenericLoc; } 4400 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4401 SourceLocation getRParenLoc() const { return RParenLoc; } 4402 4403 const Expr *getAssocExpr(unsigned i) const { 4404 return cast<Expr>(SubExprs[END_EXPR+i]); 4405 } 4406 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4407 4408 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4409 return AssocTypes[i]; 4410 } 4411 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4412 4413 QualType getAssocType(unsigned i) const { 4414 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4415 return TS->getType(); 4416 else 4417 return QualType(); 4418 } 4419 4420 const Expr *getControllingExpr() const { 4421 return cast<Expr>(SubExprs[CONTROLLING]); 4422 } 4423 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4424 4425 /// Whether this generic selection is result-dependent. 4426 bool isResultDependent() const { return ResultIndex == -1U; } 4427 4428 /// The zero-based index of the result expression's generic association in 4429 /// the generic selection's association list. Defined only if the 4430 /// generic selection is not result-dependent. 4431 unsigned getResultIndex() const { 4432 assert(!isResultDependent() && "Generic selection is result-dependent"); 4433 return ResultIndex; 4434 } 4435 4436 /// The generic selection's result expression. Defined only if the 4437 /// generic selection is not result-dependent. 4438 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4439 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4440 4441 SourceLocation getLocStart() const LLVM_READONLY { return GenericLoc; } 4442 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4443 4444 static bool classof(const Stmt *T) { 4445 return T->getStmtClass() == GenericSelectionExprClass; 4446 } 4447 4448 child_range children() { 4449 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4450 } 4451 4452 friend class ASTStmtReader; 4453 }; 4454 4455 //===----------------------------------------------------------------------===// 4456 // Clang Extensions 4457 //===----------------------------------------------------------------------===// 4458 4459 4460 /// ExtVectorElementExpr - This represents access to specific elements of a 4461 /// vector, and may occur on the left hand side or right hand side. For example 4462 /// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4463 /// 4464 /// Note that the base may have either vector or pointer to vector type, just 4465 /// like a struct field reference. 4466 /// 4467 class ExtVectorElementExpr : public Expr { 4468 Stmt *Base; 4469 IdentifierInfo *Accessor; 4470 SourceLocation AccessorLoc; 4471 public: 4472 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4473 IdentifierInfo &accessor, SourceLocation loc) 4474 : Expr(ExtVectorElementExprClass, ty, VK, 4475 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4476 base->isTypeDependent(), base->isValueDependent(), 4477 base->isInstantiationDependent(), 4478 base->containsUnexpandedParameterPack()), 4479 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4480 4481 /// \brief Build an empty vector element expression. 4482 explicit ExtVectorElementExpr(EmptyShell Empty) 4483 : Expr(ExtVectorElementExprClass, Empty) { } 4484 4485 const Expr *getBase() const { return cast<Expr>(Base); } 4486 Expr *getBase() { return cast<Expr>(Base); } 4487 void setBase(Expr *E) { Base = E; } 4488 4489 IdentifierInfo &getAccessor() const { return *Accessor; } 4490 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4491 4492 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4493 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4494 4495 /// getNumElements - Get the number of components being selected. 4496 unsigned getNumElements() const; 4497 4498 /// containsDuplicateElements - Return true if any element access is 4499 /// repeated. 4500 bool containsDuplicateElements() const; 4501 4502 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4503 /// aggregate Constant of ConstantInt(s). 4504 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4505 4506 SourceLocation getLocStart() const LLVM_READONLY { 4507 return getBase()->getLocStart(); 4508 } 4509 SourceLocation getLocEnd() const LLVM_READONLY { return AccessorLoc; } 4510 4511 /// isArrow - Return true if the base expression is a pointer to vector, 4512 /// return false if the base expression is a vector. 4513 bool isArrow() const; 4514 4515 static bool classof(const Stmt *T) { 4516 return T->getStmtClass() == ExtVectorElementExprClass; 4517 } 4518 4519 // Iterators 4520 child_range children() { return child_range(&Base, &Base+1); } 4521 }; 4522 4523 4524 /// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4525 /// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4526 class BlockExpr : public Expr { 4527 protected: 4528 BlockDecl *TheBlock; 4529 public: 4530 BlockExpr(BlockDecl *BD, QualType ty) 4531 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4532 ty->isDependentType(), ty->isDependentType(), 4533 ty->isInstantiationDependentType() || BD->isDependentContext(), 4534 false), 4535 TheBlock(BD) {} 4536 4537 /// \brief Build an empty block expression. 4538 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4539 4540 const BlockDecl *getBlockDecl() const { return TheBlock; } 4541 BlockDecl *getBlockDecl() { return TheBlock; } 4542 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4543 4544 // Convenience functions for probing the underlying BlockDecl. 4545 SourceLocation getCaretLocation() const; 4546 const Stmt *getBody() const; 4547 Stmt *getBody(); 4548 4549 SourceLocation getLocStart() const LLVM_READONLY { return getCaretLocation(); } 4550 SourceLocation getLocEnd() const LLVM_READONLY { return getBody()->getLocEnd(); } 4551 4552 /// getFunctionType - Return the underlying function type for this block. 4553 const FunctionProtoType *getFunctionType() const; 4554 4555 static bool classof(const Stmt *T) { 4556 return T->getStmtClass() == BlockExprClass; 4557 } 4558 4559 // Iterators 4560 child_range children() { return child_range(); } 4561 }; 4562 4563 /// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4564 /// This AST node provides support for reinterpreting a type to another 4565 /// type of the same size. 4566 class AsTypeExpr : public Expr { 4567 private: 4568 Stmt *SrcExpr; 4569 SourceLocation BuiltinLoc, RParenLoc; 4570 4571 friend class ASTReader; 4572 friend class ASTStmtReader; 4573 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4574 4575 public: 4576 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4577 ExprValueKind VK, ExprObjectKind OK, 4578 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4579 : Expr(AsTypeExprClass, DstType, VK, OK, 4580 DstType->isDependentType(), 4581 DstType->isDependentType() || SrcExpr->isValueDependent(), 4582 (DstType->isInstantiationDependentType() || 4583 SrcExpr->isInstantiationDependent()), 4584 (DstType->containsUnexpandedParameterPack() || 4585 SrcExpr->containsUnexpandedParameterPack())), 4586 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4587 4588 /// getSrcExpr - Return the Expr to be converted. 4589 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4590 4591 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4592 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4593 4594 /// getRParenLoc - Return the location of final right parenthesis. 4595 SourceLocation getRParenLoc() const { return RParenLoc; } 4596 4597 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 4598 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4599 4600 static bool classof(const Stmt *T) { 4601 return T->getStmtClass() == AsTypeExprClass; 4602 } 4603 4604 // Iterators 4605 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4606 }; 4607 4608 /// PseudoObjectExpr - An expression which accesses a pseudo-object 4609 /// l-value. A pseudo-object is an abstract object, accesses to which 4610 /// are translated to calls. The pseudo-object expression has a 4611 /// syntactic form, which shows how the expression was actually 4612 /// written in the source code, and a semantic form, which is a series 4613 /// of expressions to be executed in order which detail how the 4614 /// operation is actually evaluated. Optionally, one of the semantic 4615 /// forms may also provide a result value for the expression. 4616 /// 4617 /// If any of the semantic-form expressions is an OpaqueValueExpr, 4618 /// that OVE is required to have a source expression, and it is bound 4619 /// to the result of that source expression. Such OVEs may appear 4620 /// only in subsequent semantic-form expressions and as 4621 /// sub-expressions of the syntactic form. 4622 /// 4623 /// PseudoObjectExpr should be used only when an operation can be 4624 /// usefully described in terms of fairly simple rewrite rules on 4625 /// objects and functions that are meant to be used by end-developers. 4626 /// For example, under the Itanium ABI, dynamic casts are implemented 4627 /// as a call to a runtime function called __dynamic_cast; using this 4628 /// class to describe that would be inappropriate because that call is 4629 /// not really part of the user-visible semantics, and instead the 4630 /// cast is properly reflected in the AST and IR-generation has been 4631 /// taught to generate the call as necessary. In contrast, an 4632 /// Objective-C property access is semantically defined to be 4633 /// equivalent to a particular message send, and this is very much 4634 /// part of the user model. The name of this class encourages this 4635 /// modelling design. 4636 class PseudoObjectExpr : public Expr { 4637 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4638 // Always at least two, because the first sub-expression is the 4639 // syntactic form. 4640 4641 // PseudoObjectExprBits.ResultIndex - The index of the 4642 // sub-expression holding the result. 0 means the result is void, 4643 // which is unambiguous because it's the index of the syntactic 4644 // form. Note that this is therefore 1 higher than the value passed 4645 // in to Create, which is an index within the semantic forms. 4646 // Note also that ASTStmtWriter assumes this encoding. 4647 4648 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); } 4649 const Expr * const *getSubExprsBuffer() const { 4650 return reinterpret_cast<const Expr * const *>(this + 1); 4651 } 4652 4653 friend class ASTStmtReader; 4654 4655 PseudoObjectExpr(QualType type, ExprValueKind VK, 4656 Expr *syntactic, ArrayRef<Expr*> semantic, 4657 unsigned resultIndex); 4658 4659 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4660 4661 unsigned getNumSubExprs() const { 4662 return PseudoObjectExprBits.NumSubExprs; 4663 } 4664 4665 public: 4666 /// NoResult - A value for the result index indicating that there is 4667 /// no semantic result. 4668 enum : unsigned { NoResult = ~0U }; 4669 4670 static PseudoObjectExpr *Create(const ASTContext &Context, Expr *syntactic, 4671 ArrayRef<Expr*> semantic, 4672 unsigned resultIndex); 4673 4674 static PseudoObjectExpr *Create(const ASTContext &Context, EmptyShell shell, 4675 unsigned numSemanticExprs); 4676 4677 /// Return the syntactic form of this expression, i.e. the 4678 /// expression it actually looks like. Likely to be expressed in 4679 /// terms of OpaqueValueExprs bound in the semantic form. 4680 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 4681 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 4682 4683 /// Return the index of the result-bearing expression into the semantics 4684 /// expressions, or PseudoObjectExpr::NoResult if there is none. 4685 unsigned getResultExprIndex() const { 4686 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 4687 return PseudoObjectExprBits.ResultIndex - 1; 4688 } 4689 4690 /// Return the result-bearing expression, or null if there is none. 4691 Expr *getResultExpr() { 4692 if (PseudoObjectExprBits.ResultIndex == 0) 4693 return nullptr; 4694 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 4695 } 4696 const Expr *getResultExpr() const { 4697 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 4698 } 4699 4700 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 4701 4702 typedef Expr * const *semantics_iterator; 4703 typedef const Expr * const *const_semantics_iterator; 4704 semantics_iterator semantics_begin() { 4705 return getSubExprsBuffer() + 1; 4706 } 4707 const_semantics_iterator semantics_begin() const { 4708 return getSubExprsBuffer() + 1; 4709 } 4710 semantics_iterator semantics_end() { 4711 return getSubExprsBuffer() + getNumSubExprs(); 4712 } 4713 const_semantics_iterator semantics_end() const { 4714 return getSubExprsBuffer() + getNumSubExprs(); 4715 } 4716 Expr *getSemanticExpr(unsigned index) { 4717 assert(index + 1 < getNumSubExprs()); 4718 return getSubExprsBuffer()[index + 1]; 4719 } 4720 const Expr *getSemanticExpr(unsigned index) const { 4721 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 4722 } 4723 4724 SourceLocation getExprLoc() const LLVM_READONLY { 4725 return getSyntacticForm()->getExprLoc(); 4726 } 4727 4728 SourceLocation getLocStart() const LLVM_READONLY { 4729 return getSyntacticForm()->getLocStart(); 4730 } 4731 SourceLocation getLocEnd() const LLVM_READONLY { 4732 return getSyntacticForm()->getLocEnd(); 4733 } 4734 4735 child_range children() { 4736 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer()); 4737 return child_range(cs, cs + getNumSubExprs()); 4738 } 4739 4740 static bool classof(const Stmt *T) { 4741 return T->getStmtClass() == PseudoObjectExprClass; 4742 } 4743 }; 4744 4745 /// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4746 /// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4747 /// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>. 4748 /// All of these instructions take one primary pointer and at least one memory 4749 /// order. 4750 class AtomicExpr : public Expr { 4751 public: 4752 enum AtomicOp { 4753 #define BUILTIN(ID, TYPE, ATTRS) 4754 #define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID, 4755 #include "clang/Basic/Builtins.def" 4756 // Avoid trailing comma 4757 BI_First = 0 4758 }; 4759 4760 // The ABI values for various atomic memory orderings. 4761 enum AtomicOrderingKind { 4762 AO_ABI_memory_order_relaxed = 0, 4763 AO_ABI_memory_order_consume = 1, 4764 AO_ABI_memory_order_acquire = 2, 4765 AO_ABI_memory_order_release = 3, 4766 AO_ABI_memory_order_acq_rel = 4, 4767 AO_ABI_memory_order_seq_cst = 5 4768 }; 4769 4770 private: 4771 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR }; 4772 Stmt* SubExprs[END_EXPR]; 4773 unsigned NumSubExprs; 4774 SourceLocation BuiltinLoc, RParenLoc; 4775 AtomicOp Op; 4776 4777 friend class ASTStmtReader; 4778 4779 public: 4780 AtomicExpr(SourceLocation BLoc, ArrayRef<Expr*> args, QualType t, 4781 AtomicOp op, SourceLocation RP); 4782 4783 /// \brief Determine the number of arguments the specified atomic builtin 4784 /// should have. 4785 static unsigned getNumSubExprs(AtomicOp Op); 4786 4787 /// \brief Build an empty AtomicExpr. 4788 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4789 4790 Expr *getPtr() const { 4791 return cast<Expr>(SubExprs[PTR]); 4792 } 4793 Expr *getOrder() const { 4794 return cast<Expr>(SubExprs[ORDER]); 4795 } 4796 Expr *getVal1() const { 4797 if (Op == AO__c11_atomic_init) 4798 return cast<Expr>(SubExprs[ORDER]); 4799 assert(NumSubExprs > VAL1); 4800 return cast<Expr>(SubExprs[VAL1]); 4801 } 4802 Expr *getOrderFail() const { 4803 assert(NumSubExprs > ORDER_FAIL); 4804 return cast<Expr>(SubExprs[ORDER_FAIL]); 4805 } 4806 Expr *getVal2() const { 4807 if (Op == AO__atomic_exchange) 4808 return cast<Expr>(SubExprs[ORDER_FAIL]); 4809 assert(NumSubExprs > VAL2); 4810 return cast<Expr>(SubExprs[VAL2]); 4811 } 4812 Expr *getWeak() const { 4813 assert(NumSubExprs > WEAK); 4814 return cast<Expr>(SubExprs[WEAK]); 4815 } 4816 4817 AtomicOp getOp() const { return Op; } 4818 unsigned getNumSubExprs() { return NumSubExprs; } 4819 4820 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4821 4822 bool isVolatile() const { 4823 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4824 } 4825 4826 bool isCmpXChg() const { 4827 return getOp() == AO__c11_atomic_compare_exchange_strong || 4828 getOp() == AO__c11_atomic_compare_exchange_weak || 4829 getOp() == AO__atomic_compare_exchange || 4830 getOp() == AO__atomic_compare_exchange_n; 4831 } 4832 4833 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4834 SourceLocation getRParenLoc() const { return RParenLoc; } 4835 4836 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 4837 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4838 4839 static bool classof(const Stmt *T) { 4840 return T->getStmtClass() == AtomicExprClass; 4841 } 4842 4843 // Iterators 4844 child_range children() { 4845 return child_range(SubExprs, SubExprs+NumSubExprs); 4846 } 4847 }; 4848 4849 /// TypoExpr - Internal placeholder for expressions where typo correction 4850 /// still needs to be performed and/or an error diagnostic emitted. 4851 class TypoExpr : public Expr { 4852 public: 4853 TypoExpr(QualType T) 4854 : Expr(TypoExprClass, T, VK_LValue, OK_Ordinary, 4855 /*isTypeDependent*/ true, 4856 /*isValueDependent*/ true, 4857 /*isInstantiationDependent*/ true, 4858 /*containsUnexpandedParameterPack*/ false) { 4859 assert(T->isDependentType() && "TypoExpr given a non-dependent type"); 4860 } 4861 4862 child_range children() { return child_range(); } 4863 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); } 4864 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); } 4865 }; 4866 } // end namespace clang 4867 4868 #endif 4869