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/LangOptions.h" 27#include "clang/Basic/SyncScope.h" 28#include "clang/Basic/TypeTraits.h" 29#include "llvm/ADT/APFloat.h" 30#include "llvm/ADT/APSInt.h" 31#include "llvm/ADT/SmallVector.h" 32#include "llvm/ADT/StringRef.h" 33#include "llvm/Support/AtomicOrdering.h" 34#include "llvm/Support/Compiler.h" 35 36namespace clang { 37 class APValue; 38 class ASTContext; 39 class BlockDecl; 40 class CXXBaseSpecifier; 41 class CXXMemberCallExpr; 42 class CXXOperatorCallExpr; 43 class CastExpr; 44 class Decl; 45 class IdentifierInfo; 46 class MaterializeTemporaryExpr; 47 class NamedDecl; 48 class ObjCPropertyRefExpr; 49 class OpaqueValueExpr; 50 class ParmVarDecl; 51 class StringLiteral; 52 class TargetInfo; 53 class ValueDecl; 54 55/// \brief A simple array of base specifiers. 56typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 57 58/// \brief An adjustment to be made to the temporary created when emitting a 59/// reference binding, which accesses a particular subobject of that temporary. 60struct SubobjectAdjustment { 61 enum { 62 DerivedToBaseAdjustment, 63 FieldAdjustment, 64 MemberPointerAdjustment 65 } Kind; 66 67 struct DTB { 68 const CastExpr *BasePath; 69 const CXXRecordDecl *DerivedClass; 70 }; 71 72 struct P { 73 const MemberPointerType *MPT; 74 Expr *RHS; 75 }; 76 77 union { 78 struct DTB DerivedToBase; 79 FieldDecl *Field; 80 struct P Ptr; 81 }; 82 83 SubobjectAdjustment(const CastExpr *BasePath, 84 const CXXRecordDecl *DerivedClass) 85 : Kind(DerivedToBaseAdjustment) { 86 DerivedToBase.BasePath = BasePath; 87 DerivedToBase.DerivedClass = DerivedClass; 88 } 89 90 SubobjectAdjustment(FieldDecl *Field) 91 : Kind(FieldAdjustment) { 92 this->Field = Field; 93 } 94 95 SubobjectAdjustment(const MemberPointerType *MPT, Expr *RHS) 96 : Kind(MemberPointerAdjustment) { 97 this->Ptr.MPT = MPT; 98 this->Ptr.RHS = RHS; 99 } 100}; 101 102/// Expr - This represents one expression. Note that Expr's are subclasses of 103/// Stmt. This allows an expression to be transparently used any place a Stmt 104/// is required. 105/// 106class Expr : public Stmt { 107 QualType TR; 108 109protected: 110 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 111 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 112 : Stmt(SC) 113 { 114 ExprBits.TypeDependent = TD; 115 ExprBits.ValueDependent = VD; 116 ExprBits.InstantiationDependent = ID; 117 ExprBits.ValueKind = VK; 118 ExprBits.ObjectKind = OK; 119 assert(ExprBits.ObjectKind == OK && "truncated kind"); 120 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 121 setType(T); 122 } 123 124 /// \brief Construct an empty expression. 125 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 126 127public: 128 QualType getType() const { return TR; } 129 void setType(QualType t) { 130 // In C++, the type of an expression is always adjusted so that it 131 // will not have reference type (C++ [expr]p6). Use 132 // QualType::getNonReferenceType() to retrieve the non-reference 133 // type. Additionally, inspect Expr::isLvalue to determine whether 134 // an expression that is adjusted in this manner should be 135 // considered an lvalue. 136 assert((t.isNull() || !t->isReferenceType()) && 137 "Expressions can't have reference type"); 138 139 TR = t; 140 } 141 142 /// isValueDependent - Determines whether this expression is 143 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 144 /// array bound of "Chars" in the following example is 145 /// value-dependent. 146 /// @code 147 /// template<int Size, char (&Chars)[Size]> struct meta_string; 148 /// @endcode 149 bool isValueDependent() const { return ExprBits.ValueDependent; } 150 151 /// \brief Set whether this expression is value-dependent or not. 152 void setValueDependent(bool VD) { 153 ExprBits.ValueDependent = VD; 154 } 155 156 /// isTypeDependent - Determines whether this expression is 157 /// type-dependent (C++ [temp.dep.expr]), which means that its type 158 /// could change from one template instantiation to the next. For 159 /// example, the expressions "x" and "x + y" are type-dependent in 160 /// the following code, but "y" is not type-dependent: 161 /// @code 162 /// template<typename T> 163 /// void add(T x, int y) { 164 /// x + y; 165 /// } 166 /// @endcode 167 bool isTypeDependent() const { return ExprBits.TypeDependent; } 168 169 /// \brief Set whether this expression is type-dependent or not. 170 void setTypeDependent(bool TD) { 171 ExprBits.TypeDependent = TD; 172 } 173 174 /// \brief Whether this expression is instantiation-dependent, meaning that 175 /// it depends in some way on a template parameter, even if neither its type 176 /// nor (constant) value can change due to the template instantiation. 177 /// 178 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 179 /// instantiation-dependent (since it involves a template parameter \c T), but 180 /// is neither type- nor value-dependent, since the type of the inner 181 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 182 /// \c sizeof is known. 183 /// 184 /// \code 185 /// template<typename T> 186 /// void f(T x, T y) { 187 /// sizeof(sizeof(T() + T()); 188 /// } 189 /// \endcode 190 /// 191 bool isInstantiationDependent() const { 192 return ExprBits.InstantiationDependent; 193 } 194 195 /// \brief Set whether this expression is instantiation-dependent or not. 196 void setInstantiationDependent(bool ID) { 197 ExprBits.InstantiationDependent = ID; 198 } 199 200 /// \brief Whether this expression contains an unexpanded parameter 201 /// pack (for C++11 variadic templates). 202 /// 203 /// Given the following function template: 204 /// 205 /// \code 206 /// template<typename F, typename ...Types> 207 /// void forward(const F &f, Types &&...args) { 208 /// f(static_cast<Types&&>(args)...); 209 /// } 210 /// \endcode 211 /// 212 /// The expressions \c args and \c static_cast<Types&&>(args) both 213 /// contain parameter packs. 214 bool containsUnexpandedParameterPack() const { 215 return ExprBits.ContainsUnexpandedParameterPack; 216 } 217 218 /// \brief Set the bit that describes whether this expression 219 /// contains an unexpanded parameter pack. 220 void setContainsUnexpandedParameterPack(bool PP = true) { 221 ExprBits.ContainsUnexpandedParameterPack = PP; 222 } 223 224 /// getExprLoc - Return the preferred location for the arrow when diagnosing 225 /// a problem with a generic expression. 226 SourceLocation getExprLoc() const LLVM_READONLY; 227 228 /// isUnusedResultAWarning - Return true if this immediate expression should 229 /// be warned about if the result is unused. If so, fill in expr, location, 230 /// and ranges with expr to warn on and source locations/ranges appropriate 231 /// for a warning. 232 bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc, 233 SourceRange &R1, SourceRange &R2, 234 ASTContext &Ctx) const; 235 236 /// isLValue - True if this expression is an "l-value" according to 237 /// the rules of the current language. C and C++ give somewhat 238 /// different rules for this concept, but in general, the result of 239 /// an l-value expression identifies a specific object whereas the 240 /// result of an r-value expression is a value detached from any 241 /// specific storage. 242 /// 243 /// C++11 divides the concept of "r-value" into pure r-values 244 /// ("pr-values") and so-called expiring values ("x-values"), which 245 /// identify specific objects that can be safely cannibalized for 246 /// their resources. This is an unfortunate abuse of terminology on 247 /// the part of the C++ committee. In Clang, when we say "r-value", 248 /// we generally mean a pr-value. 249 bool isLValue() const { return getValueKind() == VK_LValue; } 250 bool isRValue() const { return getValueKind() == VK_RValue; } 251 bool isXValue() const { return getValueKind() == VK_XValue; } 252 bool isGLValue() const { return getValueKind() != VK_RValue; } 253 254 enum LValueClassification { 255 LV_Valid, 256 LV_NotObjectType, 257 LV_IncompleteVoidType, 258 LV_DuplicateVectorComponents, 259 LV_InvalidExpression, 260 LV_InvalidMessageExpression, 261 LV_MemberFunction, 262 LV_SubObjCPropertySetting, 263 LV_ClassTemporary, 264 LV_ArrayTemporary 265 }; 266 /// Reasons why an expression might not be an l-value. 267 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 268 269 enum isModifiableLvalueResult { 270 MLV_Valid, 271 MLV_NotObjectType, 272 MLV_IncompleteVoidType, 273 MLV_DuplicateVectorComponents, 274 MLV_InvalidExpression, 275 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 276 MLV_IncompleteType, 277 MLV_ConstQualified, 278 MLV_ConstQualifiedField, 279 MLV_ConstAddrSpace, 280 MLV_ArrayType, 281 MLV_NoSetterProperty, 282 MLV_MemberFunction, 283 MLV_SubObjCPropertySetting, 284 MLV_InvalidMessageExpression, 285 MLV_ClassTemporary, 286 MLV_ArrayTemporary 287 }; 288 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 289 /// does not have an incomplete type, does not have a const-qualified type, 290 /// and if it is a structure or union, does not have any member (including, 291 /// recursively, any member or element of all contained aggregates or unions) 292 /// with a const-qualified type. 293 /// 294 /// \param Loc [in,out] - A source location which *may* be filled 295 /// in with the location of the expression making this a 296 /// non-modifiable lvalue, if specified. 297 isModifiableLvalueResult 298 isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc = nullptr) const; 299 300 /// \brief The return type of classify(). Represents the C++11 expression 301 /// taxonomy. 302 class Classification { 303 public: 304 /// \brief The various classification results. Most of these mean prvalue. 305 enum Kinds { 306 CL_LValue, 307 CL_XValue, 308 CL_Function, // Functions cannot be lvalues in C. 309 CL_Void, // Void cannot be an lvalue in C. 310 CL_AddressableVoid, // Void expression whose address can be taken in C. 311 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 312 CL_MemberFunction, // An expression referring to a member function 313 CL_SubObjCPropertySetting, 314 CL_ClassTemporary, // A temporary of class type, or subobject thereof. 315 CL_ArrayTemporary, // A temporary of array type. 316 CL_ObjCMessageRValue, // ObjC message is an rvalue 317 CL_PRValue // A prvalue for any other reason, of any other type 318 }; 319 /// \brief The results of modification testing. 320 enum ModifiableType { 321 CM_Untested, // testModifiable was false. 322 CM_Modifiable, 323 CM_RValue, // Not modifiable because it's an rvalue 324 CM_Function, // Not modifiable because it's a function; C++ only 325 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 326 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 327 CM_ConstQualified, 328 CM_ConstQualifiedField, 329 CM_ConstAddrSpace, 330 CM_ArrayType, 331 CM_IncompleteType 332 }; 333 334 private: 335 friend class Expr; 336 337 unsigned short Kind; 338 unsigned short Modifiable; 339 340 explicit Classification(Kinds k, ModifiableType m) 341 : Kind(k), Modifiable(m) 342 {} 343 344 public: 345 Classification() {} 346 347 Kinds getKind() const { return static_cast<Kinds>(Kind); } 348 ModifiableType getModifiable() const { 349 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 350 return static_cast<ModifiableType>(Modifiable); 351 } 352 bool isLValue() const { return Kind == CL_LValue; } 353 bool isXValue() const { return Kind == CL_XValue; } 354 bool isGLValue() const { return Kind <= CL_XValue; } 355 bool isPRValue() const { return Kind >= CL_Function; } 356 bool isRValue() const { return Kind >= CL_XValue; } 357 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 358 359 /// \brief Create a simple, modifiably lvalue 360 static Classification makeSimpleLValue() { 361 return Classification(CL_LValue, CM_Modifiable); 362 } 363 364 }; 365 /// \brief Classify - Classify this expression according to the C++11 366 /// expression taxonomy. 367 /// 368 /// C++11 defines ([basic.lval]) a new taxonomy of expressions to replace the 369 /// old lvalue vs rvalue. This function determines the type of expression this 370 /// is. There are three expression types: 371 /// - lvalues are classical lvalues as in C++03. 372 /// - prvalues are equivalent to rvalues in C++03. 373 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 374 /// function returning an rvalue reference. 375 /// lvalues and xvalues are collectively referred to as glvalues, while 376 /// prvalues and xvalues together form rvalues. 377 Classification Classify(ASTContext &Ctx) const { 378 return ClassifyImpl(Ctx, nullptr); 379 } 380 381 /// \brief ClassifyModifiable - Classify this expression according to the 382 /// C++11 expression taxonomy, and see if it is valid on the left side 383 /// of an assignment. 384 /// 385 /// This function extends classify in that it also tests whether the 386 /// expression is modifiable (C99 6.3.2.1p1). 387 /// \param Loc A source location that might be filled with a relevant location 388 /// if the expression is not modifiable. 389 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 390 return ClassifyImpl(Ctx, &Loc); 391 } 392 393 /// getValueKindForType - Given a formal return or parameter type, 394 /// give its value kind. 395 static ExprValueKind getValueKindForType(QualType T) { 396 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 397 return (isa<LValueReferenceType>(RT) 398 ? VK_LValue 399 : (RT->getPointeeType()->isFunctionType() 400 ? VK_LValue : VK_XValue)); 401 return VK_RValue; 402 } 403 404 /// getValueKind - The value kind that this expression produces. 405 ExprValueKind getValueKind() const { 406 return static_cast<ExprValueKind>(ExprBits.ValueKind); 407 } 408 409 /// getObjectKind - The object kind that this expression produces. 410 /// Object kinds are meaningful only for expressions that yield an 411 /// l-value or x-value. 412 ExprObjectKind getObjectKind() const { 413 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 414 } 415 416 bool isOrdinaryOrBitFieldObject() const { 417 ExprObjectKind OK = getObjectKind(); 418 return (OK == OK_Ordinary || OK == OK_BitField); 419 } 420 421 /// setValueKind - Set the value kind produced by this expression. 422 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 423 424 /// setObjectKind - Set the object kind produced by this expression. 425 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 426 427private: 428 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 429 430public: 431 432 /// \brief Returns true if this expression is a gl-value that 433 /// potentially refers to a bit-field. 434 /// 435 /// In C++, whether a gl-value refers to a bitfield is essentially 436 /// an aspect of the value-kind type system. 437 bool refersToBitField() const { return getObjectKind() == OK_BitField; } 438 439 /// \brief If this expression refers to a bit-field, retrieve the 440 /// declaration of that bit-field. 441 /// 442 /// Note that this returns a non-null pointer in subtly different 443 /// places than refersToBitField returns true. In particular, this can 444 /// return a non-null pointer even for r-values loaded from 445 /// bit-fields, but it will return null for a conditional bit-field. 446 FieldDecl *getSourceBitField(); 447 448 const FieldDecl *getSourceBitField() const { 449 return const_cast<Expr*>(this)->getSourceBitField(); 450 } 451 452 Decl *getReferencedDeclOfCallee(); 453 const Decl *getReferencedDeclOfCallee() const { 454 return const_cast<Expr*>(this)->getReferencedDeclOfCallee(); 455 } 456 457 /// \brief If this expression is an l-value for an Objective C 458 /// property, find the underlying property reference expression. 459 const ObjCPropertyRefExpr *getObjCProperty() const; 460 461 /// \brief Check if this expression is the ObjC 'self' implicit parameter. 462 bool isObjCSelfExpr() const; 463 464 /// \brief Returns whether this expression refers to a vector element. 465 bool refersToVectorElement() const; 466 467 /// \brief Returns whether this expression refers to a global register 468 /// variable. 469 bool refersToGlobalRegisterVar() const; 470 471 /// \brief Returns whether this expression has a placeholder type. 472 bool hasPlaceholderType() const { 473 return getType()->isPlaceholderType(); 474 } 475 476 /// \brief Returns whether this expression has a specific placeholder type. 477 bool hasPlaceholderType(BuiltinType::Kind K) const { 478 assert(BuiltinType::isPlaceholderTypeKind(K)); 479 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 480 return BT->getKind() == K; 481 return false; 482 } 483 484 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 485 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 486 /// but also int expressions which are produced by things like comparisons in 487 /// C. 488 bool isKnownToHaveBooleanValue() const; 489 490 /// isIntegerConstantExpr - Return true if this expression is a valid integer 491 /// constant expression, and, if so, return its value in Result. If not a 492 /// valid i-c-e, return false and fill in Loc (if specified) with the location 493 /// of the invalid expression. 494 /// 495 /// Note: This does not perform the implicit conversions required by C++11 496 /// [expr.const]p5. 497 bool isIntegerConstantExpr(llvm::APSInt &Result, const ASTContext &Ctx, 498 SourceLocation *Loc = nullptr, 499 bool isEvaluated = true) const; 500 bool isIntegerConstantExpr(const ASTContext &Ctx, 501 SourceLocation *Loc = nullptr) const; 502 503 /// isCXX98IntegralConstantExpr - Return true if this expression is an 504 /// integral constant expression in C++98. Can only be used in C++. 505 bool isCXX98IntegralConstantExpr(const ASTContext &Ctx) const; 506 507 /// isCXX11ConstantExpr - Return true if this expression is a constant 508 /// expression in C++11. Can only be used in C++. 509 /// 510 /// Note: This does not perform the implicit conversions required by C++11 511 /// [expr.const]p5. 512 bool isCXX11ConstantExpr(const ASTContext &Ctx, APValue *Result = nullptr, 513 SourceLocation *Loc = nullptr) const; 514 515 /// isPotentialConstantExpr - Return true if this function's definition 516 /// might be usable in a constant expression in C++11, if it were marked 517 /// constexpr. Return false if the function can never produce a constant 518 /// expression, along with diagnostics describing why not. 519 static bool isPotentialConstantExpr(const FunctionDecl *FD, 520 SmallVectorImpl< 521 PartialDiagnosticAt> &Diags); 522 523 /// isPotentialConstantExprUnevaluted - Return true if this expression might 524 /// be usable in a constant expression in C++11 in an unevaluated context, if 525 /// it were in function FD marked constexpr. Return false if the function can 526 /// never produce a constant expression, along with diagnostics describing 527 /// why not. 528 static bool isPotentialConstantExprUnevaluated(Expr *E, 529 const FunctionDecl *FD, 530 SmallVectorImpl< 531 PartialDiagnosticAt> &Diags); 532 533 /// isConstantInitializer - Returns true if this expression can be emitted to 534 /// IR as a constant, and thus can be used as a constant initializer in C. 535 /// If this expression is not constant and Culprit is non-null, 536 /// it is used to store the address of first non constant expr. 537 bool isConstantInitializer(ASTContext &Ctx, bool ForRef, 538 const Expr **Culprit = nullptr) const; 539 540 /// EvalStatus is a struct with detailed info about an evaluation in progress. 541 struct EvalStatus { 542 /// \brief Whether the evaluated expression has side effects. 543 /// For example, (f() && 0) can be folded, but it still has side effects. 544 bool HasSideEffects; 545 546 /// \brief Whether the evaluation hit undefined behavior. 547 /// For example, 1.0 / 0.0 can be folded to Inf, but has undefined behavior. 548 /// Likewise, INT_MAX + 1 can be folded to INT_MIN, but has UB. 549 bool HasUndefinedBehavior; 550 551 /// Diag - If this is non-null, it will be filled in with a stack of notes 552 /// indicating why evaluation failed (or why it failed to produce a constant 553 /// expression). 554 /// If the expression is unfoldable, the notes will indicate why it's not 555 /// foldable. If the expression is foldable, but not a constant expression, 556 /// the notes will describes why it isn't a constant expression. If the 557 /// expression *is* a constant expression, no notes will be produced. 558 SmallVectorImpl<PartialDiagnosticAt> *Diag; 559 560 EvalStatus() 561 : HasSideEffects(false), HasUndefinedBehavior(false), Diag(nullptr) {} 562 563 // hasSideEffects - Return true if the evaluated expression has 564 // side effects. 565 bool hasSideEffects() const { 566 return HasSideEffects; 567 } 568 }; 569 570 /// EvalResult is a struct with detailed info about an evaluated expression. 571 struct EvalResult : EvalStatus { 572 /// Val - This is the value the expression can be folded to. 573 APValue Val; 574 575 // isGlobalLValue - Return true if the evaluated lvalue expression 576 // is global. 577 bool isGlobalLValue() const; 578 }; 579 580 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 581 /// an rvalue using any crazy technique (that has nothing to do with language 582 /// standards) that we want to, even if the expression has side-effects. If 583 /// this function returns true, it returns the folded constant in Result. If 584 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 585 /// applied. 586 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 587 588 /// EvaluateAsBooleanCondition - Return true if this is a constant 589 /// which we we can fold and convert to a boolean condition using 590 /// any crazy technique that we want to, even if the expression has 591 /// side-effects. 592 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 593 594 enum SideEffectsKind { 595 SE_NoSideEffects, ///< Strictly evaluate the expression. 596 SE_AllowUndefinedBehavior, ///< Allow UB that we can give a value, but not 597 ///< arbitrary unmodeled side effects. 598 SE_AllowSideEffects ///< Allow any unmodeled side effect. 599 }; 600 601 /// EvaluateAsInt - Return true if this is a constant which we can fold and 602 /// convert to an integer, using any crazy technique that we want to. 603 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 604 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 605 606 /// EvaluateAsFloat - Return true if this is a constant which we can fold and 607 /// convert to a floating point value, using any crazy technique that we 608 /// want to. 609 bool 610 EvaluateAsFloat(llvm::APFloat &Result, const ASTContext &Ctx, 611 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 612 613 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 614 /// constant folded without side-effects, but discard the result. 615 bool isEvaluatable(const ASTContext &Ctx, 616 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 617 618 /// HasSideEffects - This routine returns true for all those expressions 619 /// which have any effect other than producing a value. Example is a function 620 /// call, volatile variable read, or throwing an exception. If 621 /// IncludePossibleEffects is false, this call treats certain expressions with 622 /// potential side effects (such as function call-like expressions, 623 /// instantiation-dependent expressions, or invocations from a macro) as not 624 /// having side effects. 625 bool HasSideEffects(const ASTContext &Ctx, 626 bool IncludePossibleEffects = true) const; 627 628 /// \brief Determine whether this expression involves a call to any function 629 /// that is not trivial. 630 bool hasNonTrivialCall(const ASTContext &Ctx) const; 631 632 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 633 /// integer. This must be called on an expression that constant folds to an 634 /// integer. 635 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx, 636 SmallVectorImpl<PartialDiagnosticAt> *Diag = nullptr) const; 637 638 void EvaluateForOverflow(const ASTContext &Ctx) const; 639 640 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 641 /// lvalue with link time known address, with no side-effects. 642 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 643 644 /// EvaluateAsInitializer - Evaluate an expression as if it were the 645 /// initializer of the given declaration. Returns true if the initializer 646 /// can be folded to a constant, and produces any relevant notes. In C++11, 647 /// notes will be produced if the expression is not a constant expression. 648 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 649 const VarDecl *VD, 650 SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 651 652 /// EvaluateWithSubstitution - Evaluate an expression as if from the context 653 /// of a call to the given function with the given arguments, inside an 654 /// unevaluated context. Returns true if the expression could be folded to a 655 /// constant. 656 bool EvaluateWithSubstitution(APValue &Value, ASTContext &Ctx, 657 const FunctionDecl *Callee, 658 ArrayRef<const Expr*> Args, 659 const Expr *This = nullptr) const; 660 661 /// \brief If the current Expr is a pointer, this will try to statically 662 /// determine the number of bytes available where the pointer is pointing. 663 /// Returns true if all of the above holds and we were able to figure out the 664 /// size, false otherwise. 665 /// 666 /// \param Type - How to evaluate the size of the Expr, as defined by the 667 /// "type" parameter of __builtin_object_size 668 bool tryEvaluateObjectSize(uint64_t &Result, ASTContext &Ctx, 669 unsigned Type) const; 670 671 /// \brief Enumeration used to describe the kind of Null pointer constant 672 /// returned from \c isNullPointerConstant(). 673 enum NullPointerConstantKind { 674 /// \brief Expression is not a Null pointer constant. 675 NPCK_NotNull = 0, 676 677 /// \brief Expression is a Null pointer constant built from a zero integer 678 /// expression that is not a simple, possibly parenthesized, zero literal. 679 /// C++ Core Issue 903 will classify these expressions as "not pointers" 680 /// once it is adopted. 681 /// http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#903 682 NPCK_ZeroExpression, 683 684 /// \brief Expression is a Null pointer constant built from a literal zero. 685 NPCK_ZeroLiteral, 686 687 /// \brief Expression is a C++11 nullptr. 688 NPCK_CXX11_nullptr, 689 690 /// \brief Expression is a GNU-style __null constant. 691 NPCK_GNUNull 692 }; 693 694 /// \brief Enumeration used to describe how \c isNullPointerConstant() 695 /// should cope with value-dependent expressions. 696 enum NullPointerConstantValueDependence { 697 /// \brief Specifies that the expression should never be value-dependent. 698 NPC_NeverValueDependent = 0, 699 700 /// \brief Specifies that a value-dependent expression of integral or 701 /// dependent type should be considered a null pointer constant. 702 NPC_ValueDependentIsNull, 703 704 /// \brief Specifies that a value-dependent expression should be considered 705 /// to never be a null pointer constant. 706 NPC_ValueDependentIsNotNull 707 }; 708 709 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 710 /// a Null pointer constant. The return value can further distinguish the 711 /// kind of NULL pointer constant that was detected. 712 NullPointerConstantKind isNullPointerConstant( 713 ASTContext &Ctx, 714 NullPointerConstantValueDependence NPC) const; 715 716 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 717 /// write barrier. 718 bool isOBJCGCCandidate(ASTContext &Ctx) const; 719 720 /// \brief Returns true if this expression is a bound member function. 721 bool isBoundMemberFunction(ASTContext &Ctx) const; 722 723 /// \brief Given an expression of bound-member type, find the type 724 /// of the member. Returns null if this is an *overloaded* bound 725 /// member expression. 726 static QualType findBoundMemberType(const Expr *expr); 727 728 /// IgnoreImpCasts - Skip past any implicit casts which might 729 /// surround this expression. Only skips ImplicitCastExprs. 730 Expr *IgnoreImpCasts() LLVM_READONLY; 731 732 /// IgnoreImplicit - Skip past any implicit AST nodes which might 733 /// surround this expression. 734 Expr *IgnoreImplicit() LLVM_READONLY { 735 return cast<Expr>(Stmt::IgnoreImplicit()); 736 } 737 738 const Expr *IgnoreImplicit() const LLVM_READONLY { 739 return const_cast<Expr*>(this)->IgnoreImplicit(); 740 } 741 742 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 743 /// its subexpression. If that subexpression is also a ParenExpr, 744 /// then this method recursively returns its subexpression, and so forth. 745 /// Otherwise, the method returns the current Expr. 746 Expr *IgnoreParens() LLVM_READONLY; 747 748 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 749 /// or CastExprs, returning their operand. 750 Expr *IgnoreParenCasts() LLVM_READONLY; 751 752 /// Ignore casts. Strip off any CastExprs, returning their operand. 753 Expr *IgnoreCasts() LLVM_READONLY; 754 755 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 756 /// any ParenExpr or ImplicitCastExprs, returning their operand. 757 Expr *IgnoreParenImpCasts() LLVM_READONLY; 758 759 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 760 /// call to a conversion operator, return the argument. 761 Expr *IgnoreConversionOperator() LLVM_READONLY; 762 763 const Expr *IgnoreConversionOperator() const LLVM_READONLY { 764 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 765 } 766 767 const Expr *IgnoreParenImpCasts() const LLVM_READONLY { 768 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 769 } 770 771 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 772 /// CastExprs that represent lvalue casts, returning their operand. 773 Expr *IgnoreParenLValueCasts() LLVM_READONLY; 774 775 const Expr *IgnoreParenLValueCasts() const LLVM_READONLY { 776 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 777 } 778 779 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 780 /// value (including ptr->int casts of the same size). Strip off any 781 /// ParenExpr or CastExprs, returning their operand. 782 Expr *IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY; 783 784 /// Ignore parentheses and derived-to-base casts. 785 Expr *ignoreParenBaseCasts() LLVM_READONLY; 786 787 const Expr *ignoreParenBaseCasts() const LLVM_READONLY { 788 return const_cast<Expr*>(this)->ignoreParenBaseCasts(); 789 } 790 791 /// \brief Determine whether this expression is a default function argument. 792 /// 793 /// Default arguments are implicitly generated in the abstract syntax tree 794 /// by semantic analysis for function calls, object constructions, etc. in 795 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 796 /// this routine also looks through any implicit casts to determine whether 797 /// the expression is a default argument. 798 bool isDefaultArgument() const; 799 800 /// \brief Determine whether the result of this expression is a 801 /// temporary object of the given class type. 802 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 803 804 /// \brief Whether this expression is an implicit reference to 'this' in C++. 805 bool isImplicitCXXThis() const; 806 807 const Expr *IgnoreImpCasts() const LLVM_READONLY { 808 return const_cast<Expr*>(this)->IgnoreImpCasts(); 809 } 810 const Expr *IgnoreParens() const LLVM_READONLY { 811 return const_cast<Expr*>(this)->IgnoreParens(); 812 } 813 const Expr *IgnoreParenCasts() const LLVM_READONLY { 814 return const_cast<Expr*>(this)->IgnoreParenCasts(); 815 } 816 /// Strip off casts, but keep parentheses. 817 const Expr *IgnoreCasts() const LLVM_READONLY { 818 return const_cast<Expr*>(this)->IgnoreCasts(); 819 } 820 821 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const LLVM_READONLY { 822 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 823 } 824 825 static bool hasAnyTypeDependentArguments(ArrayRef<Expr *> Exprs); 826 827 /// \brief For an expression of class type or pointer to class type, 828 /// return the most derived class decl the expression is known to refer to. 829 /// 830 /// If this expression is a cast, this method looks through it to find the 831 /// most derived decl that can be inferred from the expression. 832 /// This is valid because derived-to-base conversions have undefined 833 /// behavior if the object isn't dynamically of the derived type. 834 const CXXRecordDecl *getBestDynamicClassType() const; 835 836 /// \brief Get the inner expression that determines the best dynamic class. 837 /// If this is a prvalue, we guarantee that it is of the most-derived type 838 /// for the object itself. 839 const Expr *getBestDynamicClassTypeExpr() const; 840 841 /// Walk outwards from an expression we want to bind a reference to and 842 /// find the expression whose lifetime needs to be extended. Record 843 /// the LHSs of comma expressions and adjustments needed along the path. 844 const Expr *skipRValueSubobjectAdjustments( 845 SmallVectorImpl<const Expr *> &CommaLHS, 846 SmallVectorImpl<SubobjectAdjustment> &Adjustments) const; 847 const Expr *skipRValueSubobjectAdjustments() const { 848 SmallVector<const Expr *, 8> CommaLHSs; 849 SmallVector<SubobjectAdjustment, 8> Adjustments; 850 return skipRValueSubobjectAdjustments(CommaLHSs, Adjustments); 851 } 852 853 static bool classof(const Stmt *T) { 854 return T->getStmtClass() >= firstExprConstant && 855 T->getStmtClass() <= lastExprConstant; 856 } 857}; 858 859//===----------------------------------------------------------------------===// 860// Primary Expressions. 861//===----------------------------------------------------------------------===// 862 863/// OpaqueValueExpr - An expression referring to an opaque object of a 864/// fixed type and value class. These don't correspond to concrete 865/// syntax; instead they're used to express operations (usually copy 866/// operations) on values whose source is generally obvious from 867/// context. 868class OpaqueValueExpr : public Expr { 869 friend class ASTStmtReader; 870 Expr *SourceExpr; 871 SourceLocation Loc; 872 873public: 874 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 875 ExprObjectKind OK = OK_Ordinary, 876 Expr *SourceExpr = nullptr) 877 : Expr(OpaqueValueExprClass, T, VK, OK, 878 T->isDependentType() || 879 (SourceExpr && SourceExpr->isTypeDependent()), 880 T->isDependentType() || 881 (SourceExpr && SourceExpr->isValueDependent()), 882 T->isInstantiationDependentType() || 883 (SourceExpr && SourceExpr->isInstantiationDependent()), 884 false), 885 SourceExpr(SourceExpr), Loc(Loc) { 886 } 887 888 /// Given an expression which invokes a copy constructor --- i.e. a 889 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 890 /// find the OpaqueValueExpr that's the source of the construction. 891 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 892 893 explicit OpaqueValueExpr(EmptyShell Empty) 894 : Expr(OpaqueValueExprClass, Empty) { } 895 896 /// \brief Retrieve the location of this expression. 897 SourceLocation getLocation() const { return Loc; } 898 899 SourceLocation getLocStart() const LLVM_READONLY { 900 return SourceExpr ? SourceExpr->getLocStart() : Loc; 901 } 902 SourceLocation getLocEnd() const LLVM_READONLY { 903 return SourceExpr ? SourceExpr->getLocEnd() : Loc; 904 } 905 SourceLocation getExprLoc() const LLVM_READONLY { 906 if (SourceExpr) return SourceExpr->getExprLoc(); 907 return Loc; 908 } 909 910 child_range children() { 911 return child_range(child_iterator(), child_iterator()); 912 } 913 914 const_child_range children() const { 915 return const_child_range(const_child_iterator(), const_child_iterator()); 916 } 917 918 /// The source expression of an opaque value expression is the 919 /// expression which originally generated the value. This is 920 /// provided as a convenience for analyses that don't wish to 921 /// precisely model the execution behavior of the program. 922 /// 923 /// The source expression is typically set when building the 924 /// expression which binds the opaque value expression in the first 925 /// place. 926 Expr *getSourceExpr() const { return SourceExpr; } 927 928 static bool classof(const Stmt *T) { 929 return T->getStmtClass() == OpaqueValueExprClass; 930 } 931}; 932 933/// \brief A reference to a declared variable, function, enum, etc. 934/// [C99 6.5.1p2] 935/// 936/// This encodes all the information about how a declaration is referenced 937/// within an expression. 938/// 939/// There are several optional constructs attached to DeclRefExprs only when 940/// they apply in order to conserve memory. These are laid out past the end of 941/// the object, and flags in the DeclRefExprBitfield track whether they exist: 942/// 943/// DeclRefExprBits.HasQualifier: 944/// Specifies when this declaration reference expression has a C++ 945/// nested-name-specifier. 946/// DeclRefExprBits.HasFoundDecl: 947/// Specifies when this declaration reference expression has a record of 948/// a NamedDecl (different from the referenced ValueDecl) which was found 949/// during name lookup and/or overload resolution. 950/// DeclRefExprBits.HasTemplateKWAndArgsInfo: 951/// Specifies when this declaration reference expression has an explicit 952/// C++ template keyword and/or template argument list. 953/// DeclRefExprBits.RefersToEnclosingVariableOrCapture 954/// Specifies when this declaration reference expression (validly) 955/// refers to an enclosed local or a captured variable. 956class DeclRefExpr final 957 : public Expr, 958 private llvm::TrailingObjects<DeclRefExpr, NestedNameSpecifierLoc, 959 NamedDecl *, ASTTemplateKWAndArgsInfo, 960 TemplateArgumentLoc> { 961 /// \brief The declaration that we are referencing. 962 ValueDecl *D; 963 964 /// \brief The location of the declaration name itself. 965 SourceLocation Loc; 966 967 /// \brief Provides source/type location info for the declaration name 968 /// embedded in D. 969 DeclarationNameLoc DNLoc; 970 971 size_t numTrailingObjects(OverloadToken<NestedNameSpecifierLoc>) const { 972 return hasQualifier() ? 1 : 0; 973 } 974 975 size_t numTrailingObjects(OverloadToken<NamedDecl *>) const { 976 return hasFoundDecl() ? 1 : 0; 977 } 978 979 size_t numTrailingObjects(OverloadToken<ASTTemplateKWAndArgsInfo>) const { 980 return hasTemplateKWAndArgsInfo() ? 1 : 0; 981 } 982 983 /// \brief Test whether there is a distinct FoundDecl attached to the end of 984 /// this DRE. 985 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 986 987 DeclRefExpr(const ASTContext &Ctx, 988 NestedNameSpecifierLoc QualifierLoc, 989 SourceLocation TemplateKWLoc, 990 ValueDecl *D, bool RefersToEnlosingVariableOrCapture, 991 const DeclarationNameInfo &NameInfo, 992 NamedDecl *FoundD, 993 const TemplateArgumentListInfo *TemplateArgs, 994 QualType T, ExprValueKind VK); 995 996 /// \brief Construct an empty declaration reference expression. 997 explicit DeclRefExpr(EmptyShell Empty) 998 : Expr(DeclRefExprClass, Empty) { } 999 1000 /// \brief Computes the type- and value-dependence flags for this 1001 /// declaration reference expression. 1002 void computeDependence(const ASTContext &C); 1003 1004public: 1005 DeclRefExpr(ValueDecl *D, bool RefersToEnclosingVariableOrCapture, QualType T, 1006 ExprValueKind VK, SourceLocation L, 1007 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 1008 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 1009 D(D), Loc(L), DNLoc(LocInfo) { 1010 DeclRefExprBits.HasQualifier = 0; 1011 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 1012 DeclRefExprBits.HasFoundDecl = 0; 1013 DeclRefExprBits.HadMultipleCandidates = 0; 1014 DeclRefExprBits.RefersToEnclosingVariableOrCapture = 1015 RefersToEnclosingVariableOrCapture; 1016 computeDependence(D->getASTContext()); 1017 } 1018 1019 static DeclRefExpr * 1020 Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc, 1021 SourceLocation TemplateKWLoc, ValueDecl *D, 1022 bool RefersToEnclosingVariableOrCapture, SourceLocation NameLoc, 1023 QualType T, ExprValueKind VK, NamedDecl *FoundD = nullptr, 1024 const TemplateArgumentListInfo *TemplateArgs = nullptr); 1025 1026 static DeclRefExpr * 1027 Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc, 1028 SourceLocation TemplateKWLoc, ValueDecl *D, 1029 bool RefersToEnclosingVariableOrCapture, 1030 const DeclarationNameInfo &NameInfo, QualType T, ExprValueKind VK, 1031 NamedDecl *FoundD = nullptr, 1032 const TemplateArgumentListInfo *TemplateArgs = nullptr); 1033 1034 /// \brief Construct an empty declaration reference expression. 1035 static DeclRefExpr *CreateEmpty(const ASTContext &Context, 1036 bool HasQualifier, 1037 bool HasFoundDecl, 1038 bool HasTemplateKWAndArgsInfo, 1039 unsigned NumTemplateArgs); 1040 1041 ValueDecl *getDecl() { return D; } 1042 const ValueDecl *getDecl() const { return D; } 1043 void setDecl(ValueDecl *NewD) { D = NewD; } 1044 1045 DeclarationNameInfo getNameInfo() const { 1046 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 1047 } 1048 1049 SourceLocation getLocation() const { return Loc; } 1050 void setLocation(SourceLocation L) { Loc = L; } 1051 SourceLocation getLocStart() const LLVM_READONLY; 1052 SourceLocation getLocEnd() const LLVM_READONLY; 1053 1054 /// \brief Determine whether this declaration reference was preceded by a 1055 /// C++ nested-name-specifier, e.g., \c N::foo. 1056 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 1057 1058 /// \brief If the name was qualified, retrieves the nested-name-specifier 1059 /// that precedes the name, with source-location information. 1060 NestedNameSpecifierLoc getQualifierLoc() const { 1061 if (!hasQualifier()) 1062 return NestedNameSpecifierLoc(); 1063 return *getTrailingObjects<NestedNameSpecifierLoc>(); 1064 } 1065 1066 /// \brief If the name was qualified, retrieves the nested-name-specifier 1067 /// that precedes the name. Otherwise, returns NULL. 1068 NestedNameSpecifier *getQualifier() const { 1069 return getQualifierLoc().getNestedNameSpecifier(); 1070 } 1071 1072 /// \brief Get the NamedDecl through which this reference occurred. 1073 /// 1074 /// This Decl may be different from the ValueDecl actually referred to in the 1075 /// presence of using declarations, etc. It always returns non-NULL, and may 1076 /// simple return the ValueDecl when appropriate. 1077 1078 NamedDecl *getFoundDecl() { 1079 return hasFoundDecl() ? *getTrailingObjects<NamedDecl *>() : D; 1080 } 1081 1082 /// \brief Get the NamedDecl through which this reference occurred. 1083 /// See non-const variant. 1084 const NamedDecl *getFoundDecl() const { 1085 return hasFoundDecl() ? *getTrailingObjects<NamedDecl *>() : D; 1086 } 1087 1088 bool hasTemplateKWAndArgsInfo() const { 1089 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 1090 } 1091 1092 /// \brief Retrieve the location of the template keyword preceding 1093 /// this name, if any. 1094 SourceLocation getTemplateKeywordLoc() const { 1095 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1096 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->TemplateKWLoc; 1097 } 1098 1099 /// \brief Retrieve the location of the left angle bracket starting the 1100 /// explicit template argument list following the name, if any. 1101 SourceLocation getLAngleLoc() const { 1102 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1103 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->LAngleLoc; 1104 } 1105 1106 /// \brief Retrieve the location of the right angle bracket ending the 1107 /// explicit template argument list following the name, if any. 1108 SourceLocation getRAngleLoc() const { 1109 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1110 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->RAngleLoc; 1111 } 1112 1113 /// \brief Determines whether the name in this declaration reference 1114 /// was preceded by the template keyword. 1115 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 1116 1117 /// \brief Determines whether this declaration reference was followed by an 1118 /// explicit template argument list. 1119 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 1120 1121 /// \brief Copies the template arguments (if present) into the given 1122 /// structure. 1123 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1124 if (hasExplicitTemplateArgs()) 1125 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->copyInto( 1126 getTrailingObjects<TemplateArgumentLoc>(), List); 1127 } 1128 1129 /// \brief Retrieve the template arguments provided as part of this 1130 /// template-id. 1131 const TemplateArgumentLoc *getTemplateArgs() const { 1132 if (!hasExplicitTemplateArgs()) 1133 return nullptr; 1134 1135 return getTrailingObjects<TemplateArgumentLoc>(); 1136 } 1137 1138 /// \brief Retrieve the number of template arguments provided as part of this 1139 /// template-id. 1140 unsigned getNumTemplateArgs() const { 1141 if (!hasExplicitTemplateArgs()) 1142 return 0; 1143 1144 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->NumTemplateArgs; 1145 } 1146 1147 ArrayRef<TemplateArgumentLoc> template_arguments() const { 1148 return {getTemplateArgs(), getNumTemplateArgs()}; 1149 } 1150 1151 /// \brief Returns true if this expression refers to a function that 1152 /// was resolved from an overloaded set having size greater than 1. 1153 bool hadMultipleCandidates() const { 1154 return DeclRefExprBits.HadMultipleCandidates; 1155 } 1156 /// \brief Sets the flag telling whether this expression refers to 1157 /// a function that was resolved from an overloaded set having size 1158 /// greater than 1. 1159 void setHadMultipleCandidates(bool V = true) { 1160 DeclRefExprBits.HadMultipleCandidates = V; 1161 } 1162 1163 /// \brief Does this DeclRefExpr refer to an enclosing local or a captured 1164 /// variable? 1165 bool refersToEnclosingVariableOrCapture() const { 1166 return DeclRefExprBits.RefersToEnclosingVariableOrCapture; 1167 } 1168 1169 static bool classof(const Stmt *T) { 1170 return T->getStmtClass() == DeclRefExprClass; 1171 } 1172 1173 // Iterators 1174 child_range children() { 1175 return child_range(child_iterator(), child_iterator()); 1176 } 1177 1178 const_child_range children() const { 1179 return const_child_range(const_child_iterator(), const_child_iterator()); 1180 } 1181 1182 friend TrailingObjects; 1183 friend class ASTStmtReader; 1184 friend class ASTStmtWriter; 1185}; 1186 1187/// \brief [C99 6.4.2.2] - A predefined identifier such as __func__. 1188class PredefinedExpr : public Expr { 1189public: 1190 enum IdentType { 1191 Func, 1192 Function, 1193 LFunction, // Same as Function, but as wide string. 1194 FuncDName, 1195 FuncSig, 1196 PrettyFunction, 1197 /// \brief The same as PrettyFunction, except that the 1198 /// 'virtual' keyword is omitted for virtual member functions. 1199 PrettyFunctionNoVirtual 1200 }; 1201 1202private: 1203 SourceLocation Loc; 1204 IdentType Type; 1205 Stmt *FnName; 1206 1207public: 1208 PredefinedExpr(SourceLocation L, QualType FNTy, IdentType IT, 1209 StringLiteral *SL); 1210 1211 /// \brief Construct an empty predefined expression. 1212 explicit PredefinedExpr(EmptyShell Empty) 1213 : Expr(PredefinedExprClass, Empty), Loc(), Type(Func), FnName(nullptr) {} 1214 1215 IdentType getIdentType() const { return Type; } 1216 1217 SourceLocation getLocation() const { return Loc; } 1218 void setLocation(SourceLocation L) { Loc = L; } 1219 1220 StringLiteral *getFunctionName(); 1221 const StringLiteral *getFunctionName() const { 1222 return const_cast<PredefinedExpr *>(this)->getFunctionName(); 1223 } 1224 1225 static StringRef getIdentTypeName(IdentType IT); 1226 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1227 1228 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1229 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1230 1231 static bool classof(const Stmt *T) { 1232 return T->getStmtClass() == PredefinedExprClass; 1233 } 1234 1235 // Iterators 1236 child_range children() { return child_range(&FnName, &FnName + 1); } 1237 const_child_range children() const { 1238 return const_child_range(&FnName, &FnName + 1); 1239 } 1240 1241 friend class ASTStmtReader; 1242}; 1243 1244/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1245/// leaking memory. 1246/// 1247/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1248/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1249/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1250/// the APFloat/APInt values will never get freed. APNumericStorage uses 1251/// ASTContext's allocator for memory allocation. 1252class APNumericStorage { 1253 union { 1254 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1255 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1256 }; 1257 unsigned BitWidth; 1258 1259 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1260 1261 APNumericStorage(const APNumericStorage &) = delete; 1262 void operator=(const APNumericStorage &) = delete; 1263 1264protected: 1265 APNumericStorage() : VAL(0), BitWidth(0) { } 1266 1267 llvm::APInt getIntValue() const { 1268 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1269 if (NumWords > 1) 1270 return llvm::APInt(BitWidth, NumWords, pVal); 1271 else 1272 return llvm::APInt(BitWidth, VAL); 1273 } 1274 void setIntValue(const ASTContext &C, const llvm::APInt &Val); 1275}; 1276 1277class APIntStorage : private APNumericStorage { 1278public: 1279 llvm::APInt getValue() const { return getIntValue(); } 1280 void setValue(const ASTContext &C, const llvm::APInt &Val) { 1281 setIntValue(C, Val); 1282 } 1283}; 1284 1285class APFloatStorage : private APNumericStorage { 1286public: 1287 llvm::APFloat getValue(const llvm::fltSemantics &Semantics) const { 1288 return llvm::APFloat(Semantics, getIntValue()); 1289 } 1290 void setValue(const ASTContext &C, const llvm::APFloat &Val) { 1291 setIntValue(C, Val.bitcastToAPInt()); 1292 } 1293}; 1294 1295class IntegerLiteral : public Expr, public APIntStorage { 1296 SourceLocation Loc; 1297 1298 /// \brief Construct an empty integer literal. 1299 explicit IntegerLiteral(EmptyShell Empty) 1300 : Expr(IntegerLiteralClass, Empty) { } 1301 1302public: 1303 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1304 // or UnsignedLongLongTy 1305 IntegerLiteral(const ASTContext &C, const llvm::APInt &V, QualType type, 1306 SourceLocation l); 1307 1308 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1309 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1310 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1311 /// \param V - the value that the returned integer literal contains. 1312 static IntegerLiteral *Create(const ASTContext &C, const llvm::APInt &V, 1313 QualType type, SourceLocation l); 1314 /// \brief Returns a new empty integer literal. 1315 static IntegerLiteral *Create(const ASTContext &C, EmptyShell Empty); 1316 1317 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1318 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1319 1320 /// \brief Retrieve the location of the literal. 1321 SourceLocation getLocation() const { return Loc; } 1322 1323 void setLocation(SourceLocation Location) { Loc = Location; } 1324 1325 static bool classof(const Stmt *T) { 1326 return T->getStmtClass() == IntegerLiteralClass; 1327 } 1328 1329 // Iterators 1330 child_range children() { 1331 return child_range(child_iterator(), child_iterator()); 1332 } 1333 const_child_range children() const { 1334 return const_child_range(const_child_iterator(), const_child_iterator()); 1335 } 1336}; 1337 1338class CharacterLiteral : public Expr { 1339public: 1340 enum CharacterKind { 1341 Ascii, 1342 Wide, 1343 UTF8, 1344 UTF16, 1345 UTF32 1346 }; 1347 1348private: 1349 unsigned Value; 1350 SourceLocation Loc; 1351public: 1352 // type should be IntTy 1353 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1354 SourceLocation l) 1355 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1356 false, false), 1357 Value(value), Loc(l) { 1358 CharacterLiteralBits.Kind = kind; 1359 } 1360 1361 /// \brief Construct an empty character literal. 1362 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1363 1364 SourceLocation getLocation() const { return Loc; } 1365 CharacterKind getKind() const { 1366 return static_cast<CharacterKind>(CharacterLiteralBits.Kind); 1367 } 1368 1369 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1370 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1371 1372 unsigned getValue() const { return Value; } 1373 1374 void setLocation(SourceLocation Location) { Loc = Location; } 1375 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; } 1376 void setValue(unsigned Val) { Value = Val; } 1377 1378 static bool classof(const Stmt *T) { 1379 return T->getStmtClass() == CharacterLiteralClass; 1380 } 1381 1382 // Iterators 1383 child_range children() { 1384 return child_range(child_iterator(), child_iterator()); 1385 } 1386 const_child_range children() const { 1387 return const_child_range(const_child_iterator(), const_child_iterator()); 1388 } 1389}; 1390 1391class FloatingLiteral : public Expr, private APFloatStorage { 1392 SourceLocation Loc; 1393 1394 FloatingLiteral(const ASTContext &C, const llvm::APFloat &V, bool isexact, 1395 QualType Type, SourceLocation L); 1396 1397 /// \brief Construct an empty floating-point literal. 1398 explicit FloatingLiteral(const ASTContext &C, EmptyShell Empty); 1399 1400public: 1401 static FloatingLiteral *Create(const ASTContext &C, const llvm::APFloat &V, 1402 bool isexact, QualType Type, SourceLocation L); 1403 static FloatingLiteral *Create(const ASTContext &C, EmptyShell Empty); 1404 1405 llvm::APFloat getValue() const { 1406 return APFloatStorage::getValue(getSemantics()); 1407 } 1408 void setValue(const ASTContext &C, const llvm::APFloat &Val) { 1409 assert(&getSemantics() == &Val.getSemantics() && "Inconsistent semantics"); 1410 APFloatStorage::setValue(C, Val); 1411 } 1412 1413 /// Get a raw enumeration value representing the floating-point semantics of 1414 /// this literal (32-bit IEEE, x87, ...), suitable for serialisation. 1415 APFloatSemantics getRawSemantics() const { 1416 return static_cast<APFloatSemantics>(FloatingLiteralBits.Semantics); 1417 } 1418 1419 /// Set the raw enumeration value representing the floating-point semantics of 1420 /// this literal (32-bit IEEE, x87, ...), suitable for serialisation. 1421 void setRawSemantics(APFloatSemantics Sem) { 1422 FloatingLiteralBits.Semantics = Sem; 1423 } 1424 1425 /// Return the APFloat semantics this literal uses. 1426 const llvm::fltSemantics &getSemantics() const; 1427 1428 /// Set the APFloat semantics this literal uses. 1429 void setSemantics(const llvm::fltSemantics &Sem); 1430 1431 bool isExact() const { return FloatingLiteralBits.IsExact; } 1432 void setExact(bool E) { FloatingLiteralBits.IsExact = E; } 1433 1434 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1435 /// double. Note that this may cause loss of precision, but is useful for 1436 /// debugging dumps, etc. 1437 double getValueAsApproximateDouble() const; 1438 1439 SourceLocation getLocation() const { return Loc; } 1440 void setLocation(SourceLocation L) { Loc = L; } 1441 1442 SourceLocation getLocStart() const LLVM_READONLY { return Loc; } 1443 SourceLocation getLocEnd() const LLVM_READONLY { return Loc; } 1444 1445 static bool classof(const Stmt *T) { 1446 return T->getStmtClass() == FloatingLiteralClass; 1447 } 1448 1449 // Iterators 1450 child_range children() { 1451 return child_range(child_iterator(), child_iterator()); 1452 } 1453 const_child_range children() const { 1454 return const_child_range(const_child_iterator(), const_child_iterator()); 1455 } 1456}; 1457 1458/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1459/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1460/// IntegerLiteral classes. Instances of this class always have a Complex type 1461/// whose element type matches the subexpression. 1462/// 1463class ImaginaryLiteral : public Expr { 1464 Stmt *Val; 1465public: 1466 ImaginaryLiteral(Expr *val, QualType Ty) 1467 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1468 false, false), 1469 Val(val) {} 1470 1471 /// \brief Build an empty imaginary literal. 1472 explicit ImaginaryLiteral(EmptyShell Empty) 1473 : Expr(ImaginaryLiteralClass, Empty) { } 1474 1475 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1476 Expr *getSubExpr() { return cast<Expr>(Val); } 1477 void setSubExpr(Expr *E) { Val = E; } 1478 1479 SourceLocation getLocStart() const LLVM_READONLY { return Val->getLocStart(); } 1480 SourceLocation getLocEnd() const LLVM_READONLY { return Val->getLocEnd(); } 1481 1482 static bool classof(const Stmt *T) { 1483 return T->getStmtClass() == ImaginaryLiteralClass; 1484 } 1485 1486 // Iterators 1487 child_range children() { return child_range(&Val, &Val+1); } 1488 const_child_range children() const { 1489 return const_child_range(&Val, &Val + 1); 1490 } 1491}; 1492 1493/// StringLiteral - This represents a string literal expression, e.g. "foo" 1494/// or L"bar" (wide strings). The actual string is returned by getBytes() 1495/// is NOT null-terminated, and the length of the string is determined by 1496/// calling getByteLength(). The C type for a string is always a 1497/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1498/// not. 1499/// 1500/// Note that strings in C can be formed by concatenation of multiple string 1501/// literal pptokens in translation phase #6. This keeps track of the locations 1502/// of each of these pieces. 1503/// 1504/// Strings in C can also be truncated and extended by assigning into arrays, 1505/// e.g. with constructs like: 1506/// char X[2] = "foobar"; 1507/// In this case, getByteLength() will return 6, but the string literal will 1508/// have type "char[2]". 1509class StringLiteral : public Expr { 1510public: 1511 enum StringKind { 1512 Ascii, 1513 Wide, 1514 UTF8, 1515 UTF16, 1516 UTF32 1517 }; 1518 1519private: 1520 friend class ASTStmtReader; 1521 1522 union { 1523 const char *asChar; 1524 const uint16_t *asUInt16; 1525 const uint32_t *asUInt32; 1526 } StrData; 1527 unsigned Length; 1528 unsigned CharByteWidth : 4; 1529 unsigned Kind : 3; 1530 unsigned IsPascal : 1; 1531 unsigned NumConcatenated; 1532 SourceLocation TokLocs[1]; 1533 1534 StringLiteral(QualType Ty) : 1535 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1536 false) {} 1537 1538 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1539 1540public: 1541 /// This is the "fully general" constructor that allows representation of 1542 /// strings formed from multiple concatenated tokens. 1543 static StringLiteral *Create(const ASTContext &C, StringRef Str, 1544 StringKind Kind, bool Pascal, QualType Ty, 1545 const SourceLocation *Loc, unsigned NumStrs); 1546 1547 /// Simple constructor for string literals made from one token. 1548 static StringLiteral *Create(const ASTContext &C, StringRef Str, 1549 StringKind Kind, bool Pascal, QualType Ty, 1550 SourceLocation Loc) { 1551 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1552 } 1553 1554 /// \brief Construct an empty string literal. 1555 static StringLiteral *CreateEmpty(const ASTContext &C, unsigned NumStrs); 1556 1557 StringRef getString() const { 1558 assert(CharByteWidth==1 1559 && "This function is used in places that assume strings use char"); 1560 return StringRef(StrData.asChar, getByteLength()); 1561 } 1562 1563 /// Allow access to clients that need the byte representation, such as 1564 /// ASTWriterStmt::VisitStringLiteral(). 1565 StringRef getBytes() const { 1566 // FIXME: StringRef may not be the right type to use as a result for this. 1567 if (CharByteWidth == 1) 1568 return StringRef(StrData.asChar, getByteLength()); 1569 if (CharByteWidth == 4) 1570 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1571 getByteLength()); 1572 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1573 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1574 getByteLength()); 1575 } 1576 1577 void outputString(raw_ostream &OS) const; 1578 1579 uint32_t getCodeUnit(size_t i) const { 1580 assert(i < Length && "out of bounds access"); 1581 if (CharByteWidth == 1) 1582 return static_cast<unsigned char>(StrData.asChar[i]); 1583 if (CharByteWidth == 4) 1584 return StrData.asUInt32[i]; 1585 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1586 return StrData.asUInt16[i]; 1587 } 1588 1589 unsigned getByteLength() const { return CharByteWidth*Length; } 1590 unsigned getLength() const { return Length; } 1591 unsigned getCharByteWidth() const { return CharByteWidth; } 1592 1593 /// \brief Sets the string data to the given string data. 1594 void setString(const ASTContext &C, StringRef Str, 1595 StringKind Kind, bool IsPascal); 1596 1597 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1598 1599 1600 bool isAscii() const { return Kind == Ascii; } 1601 bool isWide() const { return Kind == Wide; } 1602 bool isUTF8() const { return Kind == UTF8; } 1603 bool isUTF16() const { return Kind == UTF16; } 1604 bool isUTF32() const { return Kind == UTF32; } 1605 bool isPascal() const { return IsPascal; } 1606 1607 bool containsNonAsciiOrNull() const { 1608 StringRef Str = getString(); 1609 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1610 if (!isASCII(Str[i]) || !Str[i]) 1611 return true; 1612 return false; 1613 } 1614 1615 /// getNumConcatenated - Get the number of string literal tokens that were 1616 /// concatenated in translation phase #6 to form this string literal. 1617 unsigned getNumConcatenated() const { return NumConcatenated; } 1618 1619 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1620 assert(TokNum < NumConcatenated && "Invalid tok number"); 1621 return TokLocs[TokNum]; 1622 } 1623 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1624 assert(TokNum < NumConcatenated && "Invalid tok number"); 1625 TokLocs[TokNum] = L; 1626 } 1627 1628 /// getLocationOfByte - Return a source location that points to the specified 1629 /// byte of this string literal. 1630 /// 1631 /// Strings are amazingly complex. They can be formed from multiple tokens 1632 /// and can have escape sequences in them in addition to the usual trigraph 1633 /// and escaped newline business. This routine handles this complexity. 1634 /// 1635 SourceLocation 1636 getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1637 const LangOptions &Features, const TargetInfo &Target, 1638 unsigned *StartToken = nullptr, 1639 unsigned *StartTokenByteOffset = nullptr) const; 1640 1641 typedef const SourceLocation *tokloc_iterator; 1642 tokloc_iterator tokloc_begin() const { return TokLocs; } 1643 tokloc_iterator tokloc_end() const { return TokLocs + NumConcatenated; } 1644 1645 SourceLocation getLocStart() const LLVM_READONLY { return TokLocs[0]; } 1646 SourceLocation getLocEnd() const LLVM_READONLY { 1647 return TokLocs[NumConcatenated - 1]; 1648 } 1649 1650 static bool classof(const Stmt *T) { 1651 return T->getStmtClass() == StringLiteralClass; 1652 } 1653 1654 // Iterators 1655 child_range children() { 1656 return child_range(child_iterator(), child_iterator()); 1657 } 1658 const_child_range children() const { 1659 return const_child_range(const_child_iterator(), const_child_iterator()); 1660 } 1661}; 1662 1663/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1664/// AST node is only formed if full location information is requested. 1665class ParenExpr : public Expr { 1666 SourceLocation L, R; 1667 Stmt *Val; 1668public: 1669 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1670 : Expr(ParenExprClass, val->getType(), 1671 val->getValueKind(), val->getObjectKind(), 1672 val->isTypeDependent(), val->isValueDependent(), 1673 val->isInstantiationDependent(), 1674 val->containsUnexpandedParameterPack()), 1675 L(l), R(r), Val(val) {} 1676 1677 /// \brief Construct an empty parenthesized expression. 1678 explicit ParenExpr(EmptyShell Empty) 1679 : Expr(ParenExprClass, Empty) { } 1680 1681 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1682 Expr *getSubExpr() { return cast<Expr>(Val); } 1683 void setSubExpr(Expr *E) { Val = E; } 1684 1685 SourceLocation getLocStart() const LLVM_READONLY { return L; } 1686 SourceLocation getLocEnd() const LLVM_READONLY { return R; } 1687 1688 /// \brief Get the location of the left parentheses '('. 1689 SourceLocation getLParen() const { return L; } 1690 void setLParen(SourceLocation Loc) { L = Loc; } 1691 1692 /// \brief Get the location of the right parentheses ')'. 1693 SourceLocation getRParen() const { return R; } 1694 void setRParen(SourceLocation Loc) { R = Loc; } 1695 1696 static bool classof(const Stmt *T) { 1697 return T->getStmtClass() == ParenExprClass; 1698 } 1699 1700 // Iterators 1701 child_range children() { return child_range(&Val, &Val+1); } 1702 const_child_range children() const { 1703 return const_child_range(&Val, &Val + 1); 1704 } 1705}; 1706 1707/// UnaryOperator - This represents the unary-expression's (except sizeof and 1708/// alignof), the postinc/postdec operators from postfix-expression, and various 1709/// extensions. 1710/// 1711/// Notes on various nodes: 1712/// 1713/// Real/Imag - These return the real/imag part of a complex operand. If 1714/// applied to a non-complex value, the former returns its operand and the 1715/// later returns zero in the type of the operand. 1716/// 1717class UnaryOperator : public Expr { 1718public: 1719 typedef UnaryOperatorKind Opcode; 1720 1721private: 1722 unsigned Opc : 5; 1723 SourceLocation Loc; 1724 Stmt *Val; 1725public: 1726 1727 UnaryOperator(Expr *input, Opcode opc, QualType type, 1728 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1729 : Expr(UnaryOperatorClass, type, VK, OK, 1730 input->isTypeDependent() || type->isDependentType(), 1731 input->isValueDependent(), 1732 (input->isInstantiationDependent() || 1733 type->isInstantiationDependentType()), 1734 input->containsUnexpandedParameterPack()), 1735 Opc(opc), Loc(l), Val(input) {} 1736 1737 /// \brief Build an empty unary operator. 1738 explicit UnaryOperator(EmptyShell Empty) 1739 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1740 1741 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1742 void setOpcode(Opcode O) { Opc = O; } 1743 1744 Expr *getSubExpr() const { return cast<Expr>(Val); } 1745 void setSubExpr(Expr *E) { Val = E; } 1746 1747 /// getOperatorLoc - Return the location of the operator. 1748 SourceLocation getOperatorLoc() const { return Loc; } 1749 void setOperatorLoc(SourceLocation L) { Loc = L; } 1750 1751 /// isPostfix - Return true if this is a postfix operation, like x++. 1752 static bool isPostfix(Opcode Op) { 1753 return Op == UO_PostInc || Op == UO_PostDec; 1754 } 1755 1756 /// isPrefix - Return true if this is a prefix operation, like --x. 1757 static bool isPrefix(Opcode Op) { 1758 return Op == UO_PreInc || Op == UO_PreDec; 1759 } 1760 1761 bool isPrefix() const { return isPrefix(getOpcode()); } 1762 bool isPostfix() const { return isPostfix(getOpcode()); } 1763 1764 static bool isIncrementOp(Opcode Op) { 1765 return Op == UO_PreInc || Op == UO_PostInc; 1766 } 1767 bool isIncrementOp() const { 1768 return isIncrementOp(getOpcode()); 1769 } 1770 1771 static bool isDecrementOp(Opcode Op) { 1772 return Op == UO_PreDec || Op == UO_PostDec; 1773 } 1774 bool isDecrementOp() const { 1775 return isDecrementOp(getOpcode()); 1776 } 1777 1778 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1779 bool isIncrementDecrementOp() const { 1780 return isIncrementDecrementOp(getOpcode()); 1781 } 1782 1783 static bool isArithmeticOp(Opcode Op) { 1784 return Op >= UO_Plus && Op <= UO_LNot; 1785 } 1786 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1787 1788 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1789 /// corresponds to, e.g. "sizeof" or "[pre]++" 1790 static StringRef getOpcodeStr(Opcode Op); 1791 1792 /// \brief Retrieve the unary opcode that corresponds to the given 1793 /// overloaded operator. 1794 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1795 1796 /// \brief Retrieve the overloaded operator kind that corresponds to 1797 /// the given unary opcode. 1798 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1799 1800 SourceLocation getLocStart() const LLVM_READONLY { 1801 return isPostfix() ? Val->getLocStart() : Loc; 1802 } 1803 SourceLocation getLocEnd() const LLVM_READONLY { 1804 return isPostfix() ? Loc : Val->getLocEnd(); 1805 } 1806 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; } 1807 1808 static bool classof(const Stmt *T) { 1809 return T->getStmtClass() == UnaryOperatorClass; 1810 } 1811 1812 // Iterators 1813 child_range children() { return child_range(&Val, &Val+1); } 1814 const_child_range children() const { 1815 return const_child_range(&Val, &Val + 1); 1816 } 1817}; 1818 1819/// Helper class for OffsetOfExpr. 1820 1821// __builtin_offsetof(type, identifier(.identifier|[expr])*) 1822class OffsetOfNode { 1823public: 1824 /// \brief The kind of offsetof node we have. 1825 enum Kind { 1826 /// \brief An index into an array. 1827 Array = 0x00, 1828 /// \brief A field. 1829 Field = 0x01, 1830 /// \brief A field in a dependent type, known only by its name. 1831 Identifier = 0x02, 1832 /// \brief An implicit indirection through a C++ base class, when the 1833 /// field found is in a base class. 1834 Base = 0x03 1835 }; 1836 1837private: 1838 enum { MaskBits = 2, Mask = 0x03 }; 1839 1840 /// \brief The source range that covers this part of the designator. 1841 SourceRange Range; 1842 1843 /// \brief The data describing the designator, which comes in three 1844 /// different forms, depending on the lower two bits. 1845 /// - An unsigned index into the array of Expr*'s stored after this node 1846 /// in memory, for [constant-expression] designators. 1847 /// - A FieldDecl*, for references to a known field. 1848 /// - An IdentifierInfo*, for references to a field with a given name 1849 /// when the class type is dependent. 1850 /// - A CXXBaseSpecifier*, for references that look at a field in a 1851 /// base class. 1852 uintptr_t Data; 1853 1854public: 1855 /// \brief Create an offsetof node that refers to an array element. 1856 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1857 SourceLocation RBracketLoc) 1858 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) {} 1859 1860 /// \brief Create an offsetof node that refers to a field. 1861 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, SourceLocation NameLoc) 1862 : Range(DotLoc.isValid() ? DotLoc : NameLoc, NameLoc), 1863 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) {} 1864 1865 /// \brief Create an offsetof node that refers to an identifier. 1866 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1867 SourceLocation NameLoc) 1868 : Range(DotLoc.isValid() ? DotLoc : NameLoc, NameLoc), 1869 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) {} 1870 1871 /// \brief Create an offsetof node that refers into a C++ base class. 1872 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1873 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1874 1875 /// \brief Determine what kind of offsetof node this is. 1876 Kind getKind() const { return static_cast<Kind>(Data & Mask); } 1877 1878 /// \brief For an array element node, returns the index into the array 1879 /// of expressions. 1880 unsigned getArrayExprIndex() const { 1881 assert(getKind() == Array); 1882 return Data >> 2; 1883 } 1884 1885 /// \brief For a field offsetof node, returns the field. 1886 FieldDecl *getField() const { 1887 assert(getKind() == Field); 1888 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1889 } 1890 1891 /// \brief For a field or identifier offsetof node, returns the name of 1892 /// the field. 1893 IdentifierInfo *getFieldName() const; 1894 1895 /// \brief For a base class node, returns the base specifier. 1896 CXXBaseSpecifier *getBase() const { 1897 assert(getKind() == Base); 1898 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1899 } 1900 1901 /// \brief Retrieve the source range that covers this offsetof node. 1902 /// 1903 /// For an array element node, the source range contains the locations of 1904 /// the square brackets. For a field or identifier node, the source range 1905 /// contains the location of the period (if there is one) and the 1906 /// identifier. 1907 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 1908 SourceLocation getLocStart() const LLVM_READONLY { return Range.getBegin(); } 1909 SourceLocation getLocEnd() const LLVM_READONLY { return Range.getEnd(); } 1910}; 1911 1912/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1913/// offsetof(record-type, member-designator). For example, given: 1914/// @code 1915/// struct S { 1916/// float f; 1917/// double d; 1918/// }; 1919/// struct T { 1920/// int i; 1921/// struct S s[10]; 1922/// }; 1923/// @endcode 1924/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1925 1926class OffsetOfExpr final 1927 : public Expr, 1928 private llvm::TrailingObjects<OffsetOfExpr, OffsetOfNode, Expr *> { 1929 SourceLocation OperatorLoc, RParenLoc; 1930 // Base type; 1931 TypeSourceInfo *TSInfo; 1932 // Number of sub-components (i.e. instances of OffsetOfNode). 1933 unsigned NumComps; 1934 // Number of sub-expressions (i.e. array subscript expressions). 1935 unsigned NumExprs; 1936 1937 size_t numTrailingObjects(OverloadToken<OffsetOfNode>) const { 1938 return NumComps; 1939 } 1940 1941 OffsetOfExpr(const ASTContext &C, QualType type, 1942 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1943 ArrayRef<OffsetOfNode> comps, ArrayRef<Expr*> exprs, 1944 SourceLocation RParenLoc); 1945 1946 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1947 : Expr(OffsetOfExprClass, EmptyShell()), 1948 TSInfo(nullptr), NumComps(numComps), NumExprs(numExprs) {} 1949 1950public: 1951 1952 static OffsetOfExpr *Create(const ASTContext &C, QualType type, 1953 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1954 ArrayRef<OffsetOfNode> comps, 1955 ArrayRef<Expr*> exprs, SourceLocation RParenLoc); 1956 1957 static OffsetOfExpr *CreateEmpty(const ASTContext &C, 1958 unsigned NumComps, unsigned NumExprs); 1959 1960 /// getOperatorLoc - Return the location of the operator. 1961 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1962 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1963 1964 /// \brief Return the location of the right parentheses. 1965 SourceLocation getRParenLoc() const { return RParenLoc; } 1966 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1967 1968 TypeSourceInfo *getTypeSourceInfo() const { 1969 return TSInfo; 1970 } 1971 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1972 TSInfo = tsi; 1973 } 1974 1975 const OffsetOfNode &getComponent(unsigned Idx) const { 1976 assert(Idx < NumComps && "Subscript out of range"); 1977 return getTrailingObjects<OffsetOfNode>()[Idx]; 1978 } 1979 1980 void setComponent(unsigned Idx, OffsetOfNode ON) { 1981 assert(Idx < NumComps && "Subscript out of range"); 1982 getTrailingObjects<OffsetOfNode>()[Idx] = ON; 1983 } 1984 1985 unsigned getNumComponents() const { 1986 return NumComps; 1987 } 1988 1989 Expr* getIndexExpr(unsigned Idx) { 1990 assert(Idx < NumExprs && "Subscript out of range"); 1991 return getTrailingObjects<Expr *>()[Idx]; 1992 } 1993 1994 const Expr *getIndexExpr(unsigned Idx) const { 1995 assert(Idx < NumExprs && "Subscript out of range"); 1996 return getTrailingObjects<Expr *>()[Idx]; 1997 } 1998 1999 void setIndexExpr(unsigned Idx, Expr* E) { 2000 assert(Idx < NumComps && "Subscript out of range"); 2001 getTrailingObjects<Expr *>()[Idx] = E; 2002 } 2003 2004 unsigned getNumExpressions() const { 2005 return NumExprs; 2006 } 2007 2008 SourceLocation getLocStart() const LLVM_READONLY { return OperatorLoc; } 2009 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 2010 2011 static bool classof(const Stmt *T) { 2012 return T->getStmtClass() == OffsetOfExprClass; 2013 } 2014 2015 // Iterators 2016 child_range children() { 2017 Stmt **begin = reinterpret_cast<Stmt **>(getTrailingObjects<Expr *>()); 2018 return child_range(begin, begin + NumExprs); 2019 } 2020 const_child_range children() const { 2021 Stmt *const *begin = 2022 reinterpret_cast<Stmt *const *>(getTrailingObjects<Expr *>()); 2023 return const_child_range(begin, begin + NumExprs); 2024 } 2025 friend TrailingObjects; 2026}; 2027 2028/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 2029/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 2030/// vec_step (OpenCL 1.1 6.11.12). 2031class UnaryExprOrTypeTraitExpr : public Expr { 2032 union { 2033 TypeSourceInfo *Ty; 2034 Stmt *Ex; 2035 } Argument; 2036 SourceLocation OpLoc, RParenLoc; 2037 2038public: 2039 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 2040 QualType resultType, SourceLocation op, 2041 SourceLocation rp) : 2042 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 2043 false, // Never type-dependent (C++ [temp.dep.expr]p3). 2044 // Value-dependent if the argument is type-dependent. 2045 TInfo->getType()->isDependentType(), 2046 TInfo->getType()->isInstantiationDependentType(), 2047 TInfo->getType()->containsUnexpandedParameterPack()), 2048 OpLoc(op), RParenLoc(rp) { 2049 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 2050 UnaryExprOrTypeTraitExprBits.IsType = true; 2051 Argument.Ty = TInfo; 2052 } 2053 2054 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 2055 QualType resultType, SourceLocation op, 2056 SourceLocation rp); 2057 2058 /// \brief Construct an empty sizeof/alignof expression. 2059 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 2060 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 2061 2062 UnaryExprOrTypeTrait getKind() const { 2063 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind); 2064 } 2065 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;} 2066 2067 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; } 2068 QualType getArgumentType() const { 2069 return getArgumentTypeInfo()->getType(); 2070 } 2071 TypeSourceInfo *getArgumentTypeInfo() const { 2072 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 2073 return Argument.Ty; 2074 } 2075 Expr *getArgumentExpr() { 2076 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 2077 return static_cast<Expr*>(Argument.Ex); 2078 } 2079 const Expr *getArgumentExpr() const { 2080 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 2081 } 2082 2083 void setArgument(Expr *E) { 2084 Argument.Ex = E; 2085 UnaryExprOrTypeTraitExprBits.IsType = false; 2086 } 2087 void setArgument(TypeSourceInfo *TInfo) { 2088 Argument.Ty = TInfo; 2089 UnaryExprOrTypeTraitExprBits.IsType = true; 2090 } 2091 2092 /// Gets the argument type, or the type of the argument expression, whichever 2093 /// is appropriate. 2094 QualType getTypeOfArgument() const { 2095 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 2096 } 2097 2098 SourceLocation getOperatorLoc() const { return OpLoc; } 2099 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2100 2101 SourceLocation getRParenLoc() const { return RParenLoc; } 2102 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2103 2104 SourceLocation getLocStart() const LLVM_READONLY { return OpLoc; } 2105 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 2106 2107 static bool classof(const Stmt *T) { 2108 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 2109 } 2110 2111 // Iterators 2112 child_range children(); 2113 const_child_range children() const; 2114}; 2115 2116//===----------------------------------------------------------------------===// 2117// Postfix Operators. 2118//===----------------------------------------------------------------------===// 2119 2120/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 2121class ArraySubscriptExpr : public Expr { 2122 enum { LHS, RHS, END_EXPR=2 }; 2123 Stmt* SubExprs[END_EXPR]; 2124 SourceLocation RBracketLoc; 2125public: 2126 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 2127 ExprValueKind VK, ExprObjectKind OK, 2128 SourceLocation rbracketloc) 2129 : Expr(ArraySubscriptExprClass, t, VK, OK, 2130 lhs->isTypeDependent() || rhs->isTypeDependent(), 2131 lhs->isValueDependent() || rhs->isValueDependent(), 2132 (lhs->isInstantiationDependent() || 2133 rhs->isInstantiationDependent()), 2134 (lhs->containsUnexpandedParameterPack() || 2135 rhs->containsUnexpandedParameterPack())), 2136 RBracketLoc(rbracketloc) { 2137 SubExprs[LHS] = lhs; 2138 SubExprs[RHS] = rhs; 2139 } 2140 2141 /// \brief Create an empty array subscript expression. 2142 explicit ArraySubscriptExpr(EmptyShell Shell) 2143 : Expr(ArraySubscriptExprClass, Shell) { } 2144 2145 /// An array access can be written A[4] or 4[A] (both are equivalent). 2146 /// - getBase() and getIdx() always present the normalized view: A[4]. 2147 /// In this case getBase() returns "A" and getIdx() returns "4". 2148 /// - getLHS() and getRHS() present the syntactic view. e.g. for 2149 /// 4[A] getLHS() returns "4". 2150 /// Note: Because vector element access is also written A[4] we must 2151 /// predicate the format conversion in getBase and getIdx only on the 2152 /// the type of the RHS, as it is possible for the LHS to be a vector of 2153 /// integer type 2154 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 2155 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2156 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2157 2158 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 2159 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2160 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2161 2162 Expr *getBase() { 2163 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 2164 } 2165 2166 const Expr *getBase() const { 2167 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 2168 } 2169 2170 Expr *getIdx() { 2171 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2172 } 2173 2174 const Expr *getIdx() const { 2175 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2176 } 2177 2178 SourceLocation getLocStart() const LLVM_READONLY { 2179 return getLHS()->getLocStart(); 2180 } 2181 SourceLocation getLocEnd() const LLVM_READONLY { return RBracketLoc; } 2182 2183 SourceLocation getRBracketLoc() const { return RBracketLoc; } 2184 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 2185 2186 SourceLocation getExprLoc() const LLVM_READONLY { 2187 return getBase()->getExprLoc(); 2188 } 2189 2190 static bool classof(const Stmt *T) { 2191 return T->getStmtClass() == ArraySubscriptExprClass; 2192 } 2193 2194 // Iterators 2195 child_range children() { 2196 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2197 } 2198 const_child_range children() const { 2199 return const_child_range(&SubExprs[0], &SubExprs[0] + END_EXPR); 2200 } 2201}; 2202 2203/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 2204/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 2205/// while its subclasses may represent alternative syntax that (semantically) 2206/// results in a function call. For example, CXXOperatorCallExpr is 2207/// a subclass for overloaded operator calls that use operator syntax, e.g., 2208/// "str1 + str2" to resolve to a function call. 2209class CallExpr : public Expr { 2210 enum { FN=0, PREARGS_START=1 }; 2211 Stmt **SubExprs; 2212 unsigned NumArgs; 2213 SourceLocation RParenLoc; 2214 2215 void updateDependenciesFromArg(Expr *Arg); 2216 2217protected: 2218 // These versions of the constructor are for derived classes. 2219 CallExpr(const ASTContext &C, StmtClass SC, Expr *fn, 2220 ArrayRef<Expr *> preargs, ArrayRef<Expr *> args, QualType t, 2221 ExprValueKind VK, SourceLocation rparenloc); 2222 CallExpr(const ASTContext &C, StmtClass SC, Expr *fn, ArrayRef<Expr *> args, 2223 QualType t, ExprValueKind VK, SourceLocation rparenloc); 2224 CallExpr(const ASTContext &C, StmtClass SC, unsigned NumPreArgs, 2225 EmptyShell Empty); 2226 2227 Stmt *getPreArg(unsigned i) { 2228 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2229 return SubExprs[PREARGS_START+i]; 2230 } 2231 const Stmt *getPreArg(unsigned i) const { 2232 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2233 return SubExprs[PREARGS_START+i]; 2234 } 2235 void setPreArg(unsigned i, Stmt *PreArg) { 2236 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2237 SubExprs[PREARGS_START+i] = PreArg; 2238 } 2239 2240 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2241 2242public: 2243 CallExpr(const ASTContext& C, Expr *fn, ArrayRef<Expr*> args, QualType t, 2244 ExprValueKind VK, SourceLocation rparenloc); 2245 2246 /// \brief Build an empty call expression. 2247 CallExpr(const ASTContext &C, StmtClass SC, EmptyShell Empty); 2248 2249 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2250 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2251 void setCallee(Expr *F) { SubExprs[FN] = F; } 2252 2253 Decl *getCalleeDecl(); 2254 const Decl *getCalleeDecl() const { 2255 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2256 } 2257 2258 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2259 FunctionDecl *getDirectCallee(); 2260 const FunctionDecl *getDirectCallee() const { 2261 return const_cast<CallExpr*>(this)->getDirectCallee(); 2262 } 2263 2264 /// getNumArgs - Return the number of actual arguments to this call. 2265 /// 2266 unsigned getNumArgs() const { return NumArgs; } 2267 2268 /// \brief Retrieve the call arguments. 2269 Expr **getArgs() { 2270 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2271 } 2272 const Expr *const *getArgs() const { 2273 return reinterpret_cast<Expr **>(SubExprs + getNumPreArgs() + 2274 PREARGS_START); 2275 } 2276 2277 /// getArg - Return the specified argument. 2278 Expr *getArg(unsigned Arg) { 2279 assert(Arg < NumArgs && "Arg access out of range!"); 2280 return cast_or_null<Expr>(SubExprs[Arg + getNumPreArgs() + PREARGS_START]); 2281 } 2282 const Expr *getArg(unsigned Arg) const { 2283 assert(Arg < NumArgs && "Arg access out of range!"); 2284 return cast_or_null<Expr>(SubExprs[Arg + getNumPreArgs() + PREARGS_START]); 2285 } 2286 2287 /// setArg - Set the specified argument. 2288 void setArg(unsigned Arg, Expr *ArgExpr) { 2289 assert(Arg < NumArgs && "Arg access out of range!"); 2290 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2291 } 2292 2293 /// setNumArgs - This changes the number of arguments present in this call. 2294 /// Any orphaned expressions are deleted by this, and any new operands are set 2295 /// to null. 2296 void setNumArgs(const ASTContext& C, unsigned NumArgs); 2297 2298 typedef ExprIterator arg_iterator; 2299 typedef ConstExprIterator const_arg_iterator; 2300 typedef llvm::iterator_range<arg_iterator> arg_range; 2301 typedef llvm::iterator_range<const_arg_iterator> arg_const_range; 2302 2303 arg_range arguments() { return arg_range(arg_begin(), arg_end()); } 2304 arg_const_range arguments() const { 2305 return arg_const_range(arg_begin(), arg_end()); 2306 } 2307 2308 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2309 arg_iterator arg_end() { 2310 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2311 } 2312 const_arg_iterator arg_begin() const { 2313 return SubExprs+PREARGS_START+getNumPreArgs(); 2314 } 2315 const_arg_iterator arg_end() const { 2316 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2317 } 2318 2319 /// This method provides fast access to all the subexpressions of 2320 /// a CallExpr without going through the slower virtual child_iterator 2321 /// interface. This provides efficient reverse iteration of the 2322 /// subexpressions. This is currently used for CFG construction. 2323 ArrayRef<Stmt*> getRawSubExprs() { 2324 return llvm::makeArrayRef(SubExprs, 2325 getNumPreArgs() + PREARGS_START + getNumArgs()); 2326 } 2327 2328 /// getNumCommas - Return the number of commas that must have been present in 2329 /// this function call. 2330 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2331 2332 /// getBuiltinCallee - If this is a call to a builtin, return the builtin ID 2333 /// of the callee. If not, return 0. 2334 unsigned getBuiltinCallee() const; 2335 2336 /// \brief Returns \c true if this is a call to a builtin which does not 2337 /// evaluate side-effects within its arguments. 2338 bool isUnevaluatedBuiltinCall(const ASTContext &Ctx) const; 2339 2340 /// getCallReturnType - Get the return type of the call expr. This is not 2341 /// always the type of the expr itself, if the return type is a reference 2342 /// type. 2343 QualType getCallReturnType(const ASTContext &Ctx) const; 2344 2345 SourceLocation getRParenLoc() const { return RParenLoc; } 2346 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2347 2348 SourceLocation getLocStart() const LLVM_READONLY; 2349 SourceLocation getLocEnd() const LLVM_READONLY; 2350 2351 bool isCallToStdMove() const { 2352 const FunctionDecl* FD = getDirectCallee(); 2353 return getNumArgs() == 1 && FD && FD->isInStdNamespace() && 2354 FD->getIdentifier() && FD->getIdentifier()->isStr("move"); 2355 } 2356 2357 static bool classof(const Stmt *T) { 2358 return T->getStmtClass() >= firstCallExprConstant && 2359 T->getStmtClass() <= lastCallExprConstant; 2360 } 2361 2362 // Iterators 2363 child_range children() { 2364 return child_range(&SubExprs[0], 2365 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2366 } 2367 2368 const_child_range children() const { 2369 return const_child_range(&SubExprs[0], &SubExprs[0] + NumArgs + 2370 getNumPreArgs() + PREARGS_START); 2371 } 2372}; 2373 2374/// Extra data stored in some MemberExpr objects. 2375struct MemberExprNameQualifier { 2376 /// \brief The nested-name-specifier that qualifies the name, including 2377 /// source-location information. 2378 NestedNameSpecifierLoc QualifierLoc; 2379 2380 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2381 /// name qualifiers. 2382 DeclAccessPair FoundDecl; 2383}; 2384 2385/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2386/// 2387class MemberExpr final 2388 : public Expr, 2389 private llvm::TrailingObjects<MemberExpr, MemberExprNameQualifier, 2390 ASTTemplateKWAndArgsInfo, 2391 TemplateArgumentLoc> { 2392 /// Base - the expression for the base pointer or structure references. In 2393 /// X.F, this is "X". 2394 Stmt *Base; 2395 2396 /// MemberDecl - This is the decl being referenced by the field/member name. 2397 /// In X.F, this is the decl referenced by F. 2398 ValueDecl *MemberDecl; 2399 2400 /// MemberDNLoc - Provides source/type location info for the 2401 /// declaration name embedded in MemberDecl. 2402 DeclarationNameLoc MemberDNLoc; 2403 2404 /// MemberLoc - This is the location of the member name. 2405 SourceLocation MemberLoc; 2406 2407 /// This is the location of the -> or . in the expression. 2408 SourceLocation OperatorLoc; 2409 2410 /// IsArrow - True if this is "X->F", false if this is "X.F". 2411 bool IsArrow : 1; 2412 2413 /// \brief True if this member expression used a nested-name-specifier to 2414 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2415 /// declaration. When true, a MemberExprNameQualifier 2416 /// structure is allocated immediately after the MemberExpr. 2417 bool HasQualifierOrFoundDecl : 1; 2418 2419 /// \brief True if this member expression specified a template keyword 2420 /// and/or a template argument list explicitly, e.g., x->f<int>, 2421 /// x->template f, x->template f<int>. 2422 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2423 /// TemplateArguments (if any) are present. 2424 bool HasTemplateKWAndArgsInfo : 1; 2425 2426 /// \brief True if this member expression refers to a method that 2427 /// was resolved from an overloaded set having size greater than 1. 2428 bool HadMultipleCandidates : 1; 2429 2430 size_t numTrailingObjects(OverloadToken<MemberExprNameQualifier>) const { 2431 return HasQualifierOrFoundDecl ? 1 : 0; 2432 } 2433 2434 size_t numTrailingObjects(OverloadToken<ASTTemplateKWAndArgsInfo>) const { 2435 return HasTemplateKWAndArgsInfo ? 1 : 0; 2436 } 2437 2438public: 2439 MemberExpr(Expr *base, bool isarrow, SourceLocation operatorloc, 2440 ValueDecl *memberdecl, const DeclarationNameInfo &NameInfo, 2441 QualType ty, ExprValueKind VK, ExprObjectKind OK) 2442 : Expr(MemberExprClass, ty, VK, OK, base->isTypeDependent(), 2443 base->isValueDependent(), base->isInstantiationDependent(), 2444 base->containsUnexpandedParameterPack()), 2445 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()), 2446 MemberLoc(NameInfo.getLoc()), OperatorLoc(operatorloc), 2447 IsArrow(isarrow), HasQualifierOrFoundDecl(false), 2448 HasTemplateKWAndArgsInfo(false), HadMultipleCandidates(false) { 2449 assert(memberdecl->getDeclName() == NameInfo.getName()); 2450 } 2451 2452 // NOTE: this constructor should be used only when it is known that 2453 // the member name can not provide additional syntactic info 2454 // (i.e., source locations for C++ operator names or type source info 2455 // for constructors, destructors and conversion operators). 2456 MemberExpr(Expr *base, bool isarrow, SourceLocation operatorloc, 2457 ValueDecl *memberdecl, SourceLocation l, QualType ty, 2458 ExprValueKind VK, ExprObjectKind OK) 2459 : Expr(MemberExprClass, ty, VK, OK, base->isTypeDependent(), 2460 base->isValueDependent(), base->isInstantiationDependent(), 2461 base->containsUnexpandedParameterPack()), 2462 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l), 2463 OperatorLoc(operatorloc), IsArrow(isarrow), 2464 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2465 HadMultipleCandidates(false) {} 2466 2467 static MemberExpr *Create(const ASTContext &C, Expr *base, bool isarrow, 2468 SourceLocation OperatorLoc, 2469 NestedNameSpecifierLoc QualifierLoc, 2470 SourceLocation TemplateKWLoc, ValueDecl *memberdecl, 2471 DeclAccessPair founddecl, 2472 DeclarationNameInfo MemberNameInfo, 2473 const TemplateArgumentListInfo *targs, QualType ty, 2474 ExprValueKind VK, ExprObjectKind OK); 2475 2476 void setBase(Expr *E) { Base = E; } 2477 Expr *getBase() const { return cast<Expr>(Base); } 2478 2479 /// \brief Retrieve the member declaration to which this expression refers. 2480 /// 2481 /// The returned declaration will be a FieldDecl or (in C++) a VarDecl (for 2482 /// static data members), a CXXMethodDecl, or an EnumConstantDecl. 2483 ValueDecl *getMemberDecl() const { return MemberDecl; } 2484 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2485 2486 /// \brief Retrieves the declaration found by lookup. 2487 DeclAccessPair getFoundDecl() const { 2488 if (!HasQualifierOrFoundDecl) 2489 return DeclAccessPair::make(getMemberDecl(), 2490 getMemberDecl()->getAccess()); 2491 return getTrailingObjects<MemberExprNameQualifier>()->FoundDecl; 2492 } 2493 2494 /// \brief Determines whether this member expression actually had 2495 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2496 /// x->Base::foo. 2497 bool hasQualifier() const { return getQualifier() != nullptr; } 2498 2499 /// \brief If the member name was qualified, retrieves the 2500 /// nested-name-specifier that precedes the member name, with source-location 2501 /// information. 2502 NestedNameSpecifierLoc getQualifierLoc() const { 2503 if (!HasQualifierOrFoundDecl) 2504 return NestedNameSpecifierLoc(); 2505 2506 return getTrailingObjects<MemberExprNameQualifier>()->QualifierLoc; 2507 } 2508 2509 /// \brief If the member name was qualified, retrieves the 2510 /// nested-name-specifier that precedes the member name. Otherwise, returns 2511 /// NULL. 2512 NestedNameSpecifier *getQualifier() const { 2513 return getQualifierLoc().getNestedNameSpecifier(); 2514 } 2515 2516 /// \brief Retrieve the location of the template keyword preceding 2517 /// the member name, if any. 2518 SourceLocation getTemplateKeywordLoc() const { 2519 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2520 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->TemplateKWLoc; 2521 } 2522 2523 /// \brief Retrieve the location of the left angle bracket starting the 2524 /// explicit template argument list following the member name, if any. 2525 SourceLocation getLAngleLoc() const { 2526 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2527 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->LAngleLoc; 2528 } 2529 2530 /// \brief Retrieve the location of the right angle bracket ending the 2531 /// explicit template argument list following the member name, if any. 2532 SourceLocation getRAngleLoc() const { 2533 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2534 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->RAngleLoc; 2535 } 2536 2537 /// Determines whether the member name was preceded by the template keyword. 2538 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2539 2540 /// \brief Determines whether the member name was followed by an 2541 /// explicit template argument list. 2542 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2543 2544 /// \brief Copies the template arguments (if present) into the given 2545 /// structure. 2546 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2547 if (hasExplicitTemplateArgs()) 2548 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->copyInto( 2549 getTrailingObjects<TemplateArgumentLoc>(), List); 2550 } 2551 2552 /// \brief Retrieve the template arguments provided as part of this 2553 /// template-id. 2554 const TemplateArgumentLoc *getTemplateArgs() const { 2555 if (!hasExplicitTemplateArgs()) 2556 return nullptr; 2557 2558 return getTrailingObjects<TemplateArgumentLoc>(); 2559 } 2560 2561 /// \brief Retrieve the number of template arguments provided as part of this 2562 /// template-id. 2563 unsigned getNumTemplateArgs() const { 2564 if (!hasExplicitTemplateArgs()) 2565 return 0; 2566 2567 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->NumTemplateArgs; 2568 } 2569 2570 ArrayRef<TemplateArgumentLoc> template_arguments() const { 2571 return {getTemplateArgs(), getNumTemplateArgs()}; 2572 } 2573 2574 /// \brief Retrieve the member declaration name info. 2575 DeclarationNameInfo getMemberNameInfo() const { 2576 return DeclarationNameInfo(MemberDecl->getDeclName(), 2577 MemberLoc, MemberDNLoc); 2578 } 2579 2580 SourceLocation getOperatorLoc() const LLVM_READONLY { return OperatorLoc; } 2581 2582 bool isArrow() const { return IsArrow; } 2583 void setArrow(bool A) { IsArrow = A; } 2584 2585 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2586 /// location of 'F'. 2587 SourceLocation getMemberLoc() const { return MemberLoc; } 2588 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2589 2590 SourceLocation getLocStart() const LLVM_READONLY; 2591 SourceLocation getLocEnd() const LLVM_READONLY; 2592 2593 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; } 2594 2595 /// \brief Determine whether the base of this explicit is implicit. 2596 bool isImplicitAccess() const { 2597 return getBase() && getBase()->isImplicitCXXThis(); 2598 } 2599 2600 /// \brief Returns true if this member expression refers to a method that 2601 /// was resolved from an overloaded set having size greater than 1. 2602 bool hadMultipleCandidates() const { 2603 return HadMultipleCandidates; 2604 } 2605 /// \brief Sets the flag telling whether this expression refers to 2606 /// a method that was resolved from an overloaded set having size 2607 /// greater than 1. 2608 void setHadMultipleCandidates(bool V = true) { 2609 HadMultipleCandidates = V; 2610 } 2611 2612 /// \brief Returns true if virtual dispatch is performed. 2613 /// If the member access is fully qualified, (i.e. X::f()), virtual 2614 /// dispatching is not performed. In -fapple-kext mode qualified 2615 /// calls to virtual method will still go through the vtable. 2616 bool performsVirtualDispatch(const LangOptions &LO) const { 2617 return LO.AppleKext || !hasQualifier(); 2618 } 2619 2620 static bool classof(const Stmt *T) { 2621 return T->getStmtClass() == MemberExprClass; 2622 } 2623 2624 // Iterators 2625 child_range children() { return child_range(&Base, &Base+1); } 2626 const_child_range children() const { 2627 return const_child_range(&Base, &Base + 1); 2628 } 2629 2630 friend TrailingObjects; 2631 friend class ASTReader; 2632 friend class ASTStmtWriter; 2633}; 2634 2635/// CompoundLiteralExpr - [C99 6.5.2.5] 2636/// 2637class CompoundLiteralExpr : public Expr { 2638 /// LParenLoc - If non-null, this is the location of the left paren in a 2639 /// compound literal like "(int){4}". This can be null if this is a 2640 /// synthesized compound expression. 2641 SourceLocation LParenLoc; 2642 2643 /// The type as written. This can be an incomplete array type, in 2644 /// which case the actual expression type will be different. 2645 /// The int part of the pair stores whether this expr is file scope. 2646 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope; 2647 Stmt *Init; 2648public: 2649 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2650 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2651 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2652 tinfo->getType()->isDependentType(), 2653 init->isValueDependent(), 2654 (init->isInstantiationDependent() || 2655 tinfo->getType()->isInstantiationDependentType()), 2656 init->containsUnexpandedParameterPack()), 2657 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {} 2658 2659 /// \brief Construct an empty compound literal. 2660 explicit CompoundLiteralExpr(EmptyShell Empty) 2661 : Expr(CompoundLiteralExprClass, Empty) { } 2662 2663 const Expr *getInitializer() const { return cast<Expr>(Init); } 2664 Expr *getInitializer() { return cast<Expr>(Init); } 2665 void setInitializer(Expr *E) { Init = E; } 2666 2667 bool isFileScope() const { return TInfoAndScope.getInt(); } 2668 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); } 2669 2670 SourceLocation getLParenLoc() const { return LParenLoc; } 2671 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2672 2673 TypeSourceInfo *getTypeSourceInfo() const { 2674 return TInfoAndScope.getPointer(); 2675 } 2676 void setTypeSourceInfo(TypeSourceInfo *tinfo) { 2677 TInfoAndScope.setPointer(tinfo); 2678 } 2679 2680 SourceLocation getLocStart() const LLVM_READONLY { 2681 // FIXME: Init should never be null. 2682 if (!Init) 2683 return SourceLocation(); 2684 if (LParenLoc.isInvalid()) 2685 return Init->getLocStart(); 2686 return LParenLoc; 2687 } 2688 SourceLocation getLocEnd() const LLVM_READONLY { 2689 // FIXME: Init should never be null. 2690 if (!Init) 2691 return SourceLocation(); 2692 return Init->getLocEnd(); 2693 } 2694 2695 static bool classof(const Stmt *T) { 2696 return T->getStmtClass() == CompoundLiteralExprClass; 2697 } 2698 2699 // Iterators 2700 child_range children() { return child_range(&Init, &Init+1); } 2701 const_child_range children() const { 2702 return const_child_range(&Init, &Init + 1); 2703 } 2704}; 2705 2706/// CastExpr - Base class for type casts, including both implicit 2707/// casts (ImplicitCastExpr) and explicit casts that have some 2708/// representation in the source code (ExplicitCastExpr's derived 2709/// classes). 2710class CastExpr : public Expr { 2711private: 2712 Stmt *Op; 2713 2714 bool CastConsistency() const; 2715 2716 const CXXBaseSpecifier * const *path_buffer() const { 2717 return const_cast<CastExpr*>(this)->path_buffer(); 2718 } 2719 CXXBaseSpecifier **path_buffer(); 2720 2721 void setBasePathSize(unsigned basePathSize) { 2722 CastExprBits.BasePathSize = basePathSize; 2723 assert(CastExprBits.BasePathSize == basePathSize && 2724 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2725 } 2726 2727protected: 2728 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, const CastKind kind, 2729 Expr *op, unsigned BasePathSize) 2730 : Expr(SC, ty, VK, OK_Ordinary, 2731 // Cast expressions are type-dependent if the type is 2732 // dependent (C++ [temp.dep.expr]p3). 2733 ty->isDependentType(), 2734 // Cast expressions are value-dependent if the type is 2735 // dependent or if the subexpression is value-dependent. 2736 ty->isDependentType() || (op && op->isValueDependent()), 2737 (ty->isInstantiationDependentType() || 2738 (op && op->isInstantiationDependent())), 2739 // An implicit cast expression doesn't (lexically) contain an 2740 // unexpanded pack, even if its target type does. 2741 ((SC != ImplicitCastExprClass && 2742 ty->containsUnexpandedParameterPack()) || 2743 (op && op->containsUnexpandedParameterPack()))), 2744 Op(op) { 2745 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2746 CastExprBits.Kind = kind; 2747 setBasePathSize(BasePathSize); 2748 assert(CastConsistency()); 2749 } 2750 2751 /// \brief Construct an empty cast. 2752 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2753 : Expr(SC, Empty) { 2754 setBasePathSize(BasePathSize); 2755 } 2756 2757public: 2758 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2759 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2760 const char *getCastKindName() const; 2761 2762 Expr *getSubExpr() { return cast<Expr>(Op); } 2763 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2764 void setSubExpr(Expr *E) { Op = E; } 2765 2766 /// \brief Retrieve the cast subexpression as it was written in the source 2767 /// code, looking through any implicit casts or other intermediate nodes 2768 /// introduced by semantic analysis. 2769 Expr *getSubExprAsWritten(); 2770 const Expr *getSubExprAsWritten() const { 2771 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2772 } 2773 2774 typedef CXXBaseSpecifier **path_iterator; 2775 typedef const CXXBaseSpecifier * const *path_const_iterator; 2776 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2777 unsigned path_size() const { return CastExprBits.BasePathSize; } 2778 path_iterator path_begin() { return path_buffer(); } 2779 path_iterator path_end() { return path_buffer() + path_size(); } 2780 path_const_iterator path_begin() const { return path_buffer(); } 2781 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2782 2783 const FieldDecl *getTargetUnionField() const { 2784 assert(getCastKind() == CK_ToUnion); 2785 return getTargetFieldForToUnionCast(getType(), getSubExpr()->getType()); 2786 } 2787 2788 static const FieldDecl *getTargetFieldForToUnionCast(QualType unionType, 2789 QualType opType); 2790 static const FieldDecl *getTargetFieldForToUnionCast(const RecordDecl *RD, 2791 QualType opType); 2792 2793 static bool classof(const Stmt *T) { 2794 return T->getStmtClass() >= firstCastExprConstant && 2795 T->getStmtClass() <= lastCastExprConstant; 2796 } 2797 2798 // Iterators 2799 child_range children() { return child_range(&Op, &Op+1); } 2800 const_child_range children() const { return const_child_range(&Op, &Op + 1); } 2801}; 2802 2803/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2804/// conversions, which have no direct representation in the original 2805/// source code. For example: converting T[]->T*, void f()->void 2806/// (*f)(), float->double, short->int, etc. 2807/// 2808/// In C, implicit casts always produce rvalues. However, in C++, an 2809/// implicit cast whose result is being bound to a reference will be 2810/// an lvalue or xvalue. For example: 2811/// 2812/// @code 2813/// class Base { }; 2814/// class Derived : public Base { }; 2815/// Derived &&ref(); 2816/// void f(Derived d) { 2817/// Base& b = d; // initializer is an ImplicitCastExpr 2818/// // to an lvalue of type Base 2819/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2820/// // to an xvalue of type Base 2821/// } 2822/// @endcode 2823class ImplicitCastExpr final 2824 : public CastExpr, 2825 private llvm::TrailingObjects<ImplicitCastExpr, CXXBaseSpecifier *> { 2826private: 2827 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2828 unsigned BasePathLength, ExprValueKind VK) 2829 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2830 } 2831 2832 /// \brief Construct an empty implicit cast. 2833 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2834 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2835 2836public: 2837 enum OnStack_t { OnStack }; 2838 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2839 ExprValueKind VK) 2840 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2841 } 2842 2843 static ImplicitCastExpr *Create(const ASTContext &Context, QualType T, 2844 CastKind Kind, Expr *Operand, 2845 const CXXCastPath *BasePath, 2846 ExprValueKind Cat); 2847 2848 static ImplicitCastExpr *CreateEmpty(const ASTContext &Context, 2849 unsigned PathSize); 2850 2851 SourceLocation getLocStart() const LLVM_READONLY { 2852 return getSubExpr()->getLocStart(); 2853 } 2854 SourceLocation getLocEnd() const LLVM_READONLY { 2855 return getSubExpr()->getLocEnd(); 2856 } 2857 2858 static bool classof(const Stmt *T) { 2859 return T->getStmtClass() == ImplicitCastExprClass; 2860 } 2861 2862 friend TrailingObjects; 2863 friend class CastExpr; 2864}; 2865 2866inline Expr *Expr::IgnoreImpCasts() { 2867 Expr *e = this; 2868 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2869 e = ice->getSubExpr(); 2870 return e; 2871} 2872 2873/// ExplicitCastExpr - An explicit cast written in the source 2874/// code. 2875/// 2876/// This class is effectively an abstract class, because it provides 2877/// the basic representation of an explicitly-written cast without 2878/// specifying which kind of cast (C cast, functional cast, static 2879/// cast, etc.) was written; specific derived classes represent the 2880/// particular style of cast and its location information. 2881/// 2882/// Unlike implicit casts, explicit cast nodes have two different 2883/// types: the type that was written into the source code, and the 2884/// actual type of the expression as determined by semantic 2885/// analysis. These types may differ slightly. For example, in C++ one 2886/// can cast to a reference type, which indicates that the resulting 2887/// expression will be an lvalue or xvalue. The reference type, however, 2888/// will not be used as the type of the expression. 2889class ExplicitCastExpr : public CastExpr { 2890 /// TInfo - Source type info for the (written) type 2891 /// this expression is casting to. 2892 TypeSourceInfo *TInfo; 2893 2894protected: 2895 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2896 CastKind kind, Expr *op, unsigned PathSize, 2897 TypeSourceInfo *writtenTy) 2898 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2899 2900 /// \brief Construct an empty explicit cast. 2901 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2902 : CastExpr(SC, Shell, PathSize) { } 2903 2904public: 2905 /// getTypeInfoAsWritten - Returns the type source info for the type 2906 /// that this expression is casting to. 2907 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2908 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2909 2910 /// getTypeAsWritten - Returns the type that this expression is 2911 /// casting to, as written in the source code. 2912 QualType getTypeAsWritten() const { return TInfo->getType(); } 2913 2914 static bool classof(const Stmt *T) { 2915 return T->getStmtClass() >= firstExplicitCastExprConstant && 2916 T->getStmtClass() <= lastExplicitCastExprConstant; 2917 } 2918}; 2919 2920/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2921/// cast in C++ (C++ [expr.cast]), which uses the syntax 2922/// (Type)expr. For example: @c (int)f. 2923class CStyleCastExpr final 2924 : public ExplicitCastExpr, 2925 private llvm::TrailingObjects<CStyleCastExpr, CXXBaseSpecifier *> { 2926 SourceLocation LPLoc; // the location of the left paren 2927 SourceLocation RPLoc; // the location of the right paren 2928 2929 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2930 unsigned PathSize, TypeSourceInfo *writtenTy, 2931 SourceLocation l, SourceLocation r) 2932 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2933 writtenTy), LPLoc(l), RPLoc(r) {} 2934 2935 /// \brief Construct an empty C-style explicit cast. 2936 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2937 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2938 2939public: 2940 static CStyleCastExpr *Create(const ASTContext &Context, QualType T, 2941 ExprValueKind VK, CastKind K, 2942 Expr *Op, const CXXCastPath *BasePath, 2943 TypeSourceInfo *WrittenTy, SourceLocation L, 2944 SourceLocation R); 2945 2946 static CStyleCastExpr *CreateEmpty(const ASTContext &Context, 2947 unsigned PathSize); 2948 2949 SourceLocation getLParenLoc() const { return LPLoc; } 2950 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2951 2952 SourceLocation getRParenLoc() const { return RPLoc; } 2953 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2954 2955 SourceLocation getLocStart() const LLVM_READONLY { return LPLoc; } 2956 SourceLocation getLocEnd() const LLVM_READONLY { 2957 return getSubExpr()->getLocEnd(); 2958 } 2959 2960 static bool classof(const Stmt *T) { 2961 return T->getStmtClass() == CStyleCastExprClass; 2962 } 2963 2964 friend TrailingObjects; 2965 friend class CastExpr; 2966}; 2967 2968/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2969/// 2970/// This expression node kind describes a builtin binary operation, 2971/// such as "x + y" for integer values "x" and "y". The operands will 2972/// already have been converted to appropriate types (e.g., by 2973/// performing promotions or conversions). 2974/// 2975/// In C++, where operators may be overloaded, a different kind of 2976/// expression node (CXXOperatorCallExpr) is used to express the 2977/// invocation of an overloaded operator with operator syntax. Within 2978/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2979/// used to store an expression "x + y" depends on the subexpressions 2980/// for x and y. If neither x or y is type-dependent, and the "+" 2981/// operator resolves to a built-in operation, BinaryOperator will be 2982/// used to express the computation (x and y may still be 2983/// value-dependent). If either x or y is type-dependent, or if the 2984/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2985/// be used to express the computation. 2986class BinaryOperator : public Expr { 2987public: 2988 typedef BinaryOperatorKind Opcode; 2989 2990private: 2991 unsigned Opc : 6; 2992 2993 // This is only meaningful for operations on floating point types and 0 2994 // otherwise. 2995 unsigned FPFeatures : 2; 2996 SourceLocation OpLoc; 2997 2998 enum { LHS, RHS, END_EXPR }; 2999 Stmt* SubExprs[END_EXPR]; 3000public: 3001 3002 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 3003 ExprValueKind VK, ExprObjectKind OK, 3004 SourceLocation opLoc, FPOptions FPFeatures) 3005 : Expr(BinaryOperatorClass, ResTy, VK, OK, 3006 lhs->isTypeDependent() || rhs->isTypeDependent(), 3007 lhs->isValueDependent() || rhs->isValueDependent(), 3008 (lhs->isInstantiationDependent() || 3009 rhs->isInstantiationDependent()), 3010 (lhs->containsUnexpandedParameterPack() || 3011 rhs->containsUnexpandedParameterPack())), 3012 Opc(opc), FPFeatures(FPFeatures.getInt()), OpLoc(opLoc) { 3013 SubExprs[LHS] = lhs; 3014 SubExprs[RHS] = rhs; 3015 assert(!isCompoundAssignmentOp() && 3016 "Use CompoundAssignOperator for compound assignments"); 3017 } 3018 3019 /// \brief Construct an empty binary operator. 3020 explicit BinaryOperator(EmptyShell Empty) 3021 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 3022 3023 SourceLocation getExprLoc() const LLVM_READONLY { return OpLoc; } 3024 SourceLocation getOperatorLoc() const { return OpLoc; } 3025 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 3026 3027 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 3028 void setOpcode(Opcode O) { Opc = O; } 3029 3030 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3031 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3032 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3033 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3034 3035 SourceLocation getLocStart() const LLVM_READONLY { 3036 return getLHS()->getLocStart(); 3037 } 3038 SourceLocation getLocEnd() const LLVM_READONLY { 3039 return getRHS()->getLocEnd(); 3040 } 3041 3042 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 3043 /// corresponds to, e.g. "<<=". 3044 static StringRef getOpcodeStr(Opcode Op); 3045 3046 StringRef getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 3047 3048 /// \brief Retrieve the binary opcode that corresponds to the given 3049 /// overloaded operator. 3050 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 3051 3052 /// \brief Retrieve the overloaded operator kind that corresponds to 3053 /// the given binary opcode. 3054 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 3055 3056 /// predicates to categorize the respective opcodes. 3057 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 3058 static bool isMultiplicativeOp(Opcode Opc) { 3059 return Opc >= BO_Mul && Opc <= BO_Rem; 3060 } 3061 bool isMultiplicativeOp() const { return isMultiplicativeOp(getOpcode()); } 3062 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 3063 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 3064 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 3065 bool isShiftOp() const { return isShiftOp(getOpcode()); } 3066 3067 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 3068 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 3069 3070 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 3071 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 3072 3073 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 3074 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 3075 3076 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 3077 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 3078 3079 static Opcode negateComparisonOp(Opcode Opc) { 3080 switch (Opc) { 3081 default: 3082 llvm_unreachable("Not a comparsion operator."); 3083 case BO_LT: return BO_GE; 3084 case BO_GT: return BO_LE; 3085 case BO_LE: return BO_GT; 3086 case BO_GE: return BO_LT; 3087 case BO_EQ: return BO_NE; 3088 case BO_NE: return BO_EQ; 3089 } 3090 } 3091 3092 static Opcode reverseComparisonOp(Opcode Opc) { 3093 switch (Opc) { 3094 default: 3095 llvm_unreachable("Not a comparsion operator."); 3096 case BO_LT: return BO_GT; 3097 case BO_GT: return BO_LT; 3098 case BO_LE: return BO_GE; 3099 case BO_GE: return BO_LE; 3100 case BO_EQ: 3101 case BO_NE: 3102 return Opc; 3103 } 3104 } 3105 3106 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 3107 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 3108 3109 static bool isAssignmentOp(Opcode Opc) { 3110 return Opc >= BO_Assign && Opc <= BO_OrAssign; 3111 } 3112 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 3113 3114 static bool isCompoundAssignmentOp(Opcode Opc) { 3115 return Opc > BO_Assign && Opc <= BO_OrAssign; 3116 } 3117 bool isCompoundAssignmentOp() const { 3118 return isCompoundAssignmentOp(getOpcode()); 3119 } 3120 static Opcode getOpForCompoundAssignment(Opcode Opc) { 3121 assert(isCompoundAssignmentOp(Opc)); 3122 if (Opc >= BO_AndAssign) 3123 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 3124 else 3125 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 3126 } 3127 3128 static bool isShiftAssignOp(Opcode Opc) { 3129 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 3130 } 3131 bool isShiftAssignOp() const { 3132 return isShiftAssignOp(getOpcode()); 3133 } 3134 3135 // Return true if a binary operator using the specified opcode and operands 3136 // would match the 'p = (i8*)nullptr + n' idiom for casting a pointer-sized 3137 // integer to a pointer. 3138 static bool isNullPointerArithmeticExtension(ASTContext &Ctx, Opcode Opc, 3139 Expr *LHS, Expr *RHS); 3140 3141 static bool classof(const Stmt *S) { 3142 return S->getStmtClass() >= firstBinaryOperatorConstant && 3143 S->getStmtClass() <= lastBinaryOperatorConstant; 3144 } 3145 3146 // Iterators 3147 child_range children() { 3148 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3149 } 3150 const_child_range children() const { 3151 return const_child_range(&SubExprs[0], &SubExprs[0] + END_EXPR); 3152 } 3153 3154 // Set the FP contractability status of this operator. Only meaningful for 3155 // operations on floating point types. 3156 void setFPFeatures(FPOptions F) { FPFeatures = F.getInt(); } 3157 3158 FPOptions getFPFeatures() const { return FPOptions(FPFeatures); } 3159 3160 // Get the FP contractability status of this operator. Only meaningful for 3161 // operations on floating point types. 3162 bool isFPContractableWithinStatement() const { 3163 return FPOptions(FPFeatures).allowFPContractWithinStatement(); 3164 } 3165 3166protected: 3167 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 3168 ExprValueKind VK, ExprObjectKind OK, 3169 SourceLocation opLoc, FPOptions FPFeatures, bool dead2) 3170 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 3171 lhs->isTypeDependent() || rhs->isTypeDependent(), 3172 lhs->isValueDependent() || rhs->isValueDependent(), 3173 (lhs->isInstantiationDependent() || 3174 rhs->isInstantiationDependent()), 3175 (lhs->containsUnexpandedParameterPack() || 3176 rhs->containsUnexpandedParameterPack())), 3177 Opc(opc), FPFeatures(FPFeatures.getInt()), OpLoc(opLoc) { 3178 SubExprs[LHS] = lhs; 3179 SubExprs[RHS] = rhs; 3180 } 3181 3182 BinaryOperator(StmtClass SC, EmptyShell Empty) 3183 : Expr(SC, Empty), Opc(BO_MulAssign) { } 3184}; 3185 3186/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 3187/// track of the type the operation is performed in. Due to the semantics of 3188/// these operators, the operands are promoted, the arithmetic performed, an 3189/// implicit conversion back to the result type done, then the assignment takes 3190/// place. This captures the intermediate type which the computation is done 3191/// in. 3192class CompoundAssignOperator : public BinaryOperator { 3193 QualType ComputationLHSType; 3194 QualType ComputationResultType; 3195public: 3196 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 3197 ExprValueKind VK, ExprObjectKind OK, 3198 QualType CompLHSType, QualType CompResultType, 3199 SourceLocation OpLoc, FPOptions FPFeatures) 3200 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, FPFeatures, 3201 true), 3202 ComputationLHSType(CompLHSType), 3203 ComputationResultType(CompResultType) { 3204 assert(isCompoundAssignmentOp() && 3205 "Only should be used for compound assignments"); 3206 } 3207 3208 /// \brief Build an empty compound assignment operator expression. 3209 explicit CompoundAssignOperator(EmptyShell Empty) 3210 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 3211 3212 // The two computation types are the type the LHS is converted 3213 // to for the computation and the type of the result; the two are 3214 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 3215 QualType getComputationLHSType() const { return ComputationLHSType; } 3216 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 3217 3218 QualType getComputationResultType() const { return ComputationResultType; } 3219 void setComputationResultType(QualType T) { ComputationResultType = T; } 3220 3221 static bool classof(const Stmt *S) { 3222 return S->getStmtClass() == CompoundAssignOperatorClass; 3223 } 3224}; 3225 3226/// AbstractConditionalOperator - An abstract base class for 3227/// ConditionalOperator and BinaryConditionalOperator. 3228class AbstractConditionalOperator : public Expr { 3229 SourceLocation QuestionLoc, ColonLoc; 3230 friend class ASTStmtReader; 3231 3232protected: 3233 AbstractConditionalOperator(StmtClass SC, QualType T, 3234 ExprValueKind VK, ExprObjectKind OK, 3235 bool TD, bool VD, bool ID, 3236 bool ContainsUnexpandedParameterPack, 3237 SourceLocation qloc, 3238 SourceLocation cloc) 3239 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 3240 QuestionLoc(qloc), ColonLoc(cloc) {} 3241 3242 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 3243 : Expr(SC, Empty) { } 3244 3245public: 3246 // getCond - Return the expression representing the condition for 3247 // the ?: operator. 3248 Expr *getCond() const; 3249 3250 // getTrueExpr - Return the subexpression representing the value of 3251 // the expression if the condition evaluates to true. 3252 Expr *getTrueExpr() const; 3253 3254 // getFalseExpr - Return the subexpression representing the value of 3255 // the expression if the condition evaluates to false. This is 3256 // the same as getRHS. 3257 Expr *getFalseExpr() const; 3258 3259 SourceLocation getQuestionLoc() const { return QuestionLoc; } 3260 SourceLocation getColonLoc() const { return ColonLoc; } 3261 3262 static bool classof(const Stmt *T) { 3263 return T->getStmtClass() == ConditionalOperatorClass || 3264 T->getStmtClass() == BinaryConditionalOperatorClass; 3265 } 3266}; 3267 3268/// ConditionalOperator - The ?: ternary operator. The GNU "missing 3269/// middle" extension is a BinaryConditionalOperator. 3270class ConditionalOperator : public AbstractConditionalOperator { 3271 enum { COND, LHS, RHS, END_EXPR }; 3272 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3273 3274 friend class ASTStmtReader; 3275public: 3276 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 3277 SourceLocation CLoc, Expr *rhs, 3278 QualType t, ExprValueKind VK, ExprObjectKind OK) 3279 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 3280 // FIXME: the type of the conditional operator doesn't 3281 // depend on the type of the conditional, but the standard 3282 // seems to imply that it could. File a bug! 3283 (lhs->isTypeDependent() || rhs->isTypeDependent()), 3284 (cond->isValueDependent() || lhs->isValueDependent() || 3285 rhs->isValueDependent()), 3286 (cond->isInstantiationDependent() || 3287 lhs->isInstantiationDependent() || 3288 rhs->isInstantiationDependent()), 3289 (cond->containsUnexpandedParameterPack() || 3290 lhs->containsUnexpandedParameterPack() || 3291 rhs->containsUnexpandedParameterPack()), 3292 QLoc, CLoc) { 3293 SubExprs[COND] = cond; 3294 SubExprs[LHS] = lhs; 3295 SubExprs[RHS] = rhs; 3296 } 3297 3298 /// \brief Build an empty conditional operator. 3299 explicit ConditionalOperator(EmptyShell Empty) 3300 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 3301 3302 // getCond - Return the expression representing the condition for 3303 // the ?: operator. 3304 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3305 3306 // getTrueExpr - Return the subexpression representing the value of 3307 // the expression if the condition evaluates to true. 3308 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3309 3310 // getFalseExpr - Return the subexpression representing the value of 3311 // the expression if the condition evaluates to false. This is 3312 // the same as getRHS. 3313 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3314 3315 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3316 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3317 3318 SourceLocation getLocStart() const LLVM_READONLY { 3319 return getCond()->getLocStart(); 3320 } 3321 SourceLocation getLocEnd() const LLVM_READONLY { 3322 return getRHS()->getLocEnd(); 3323 } 3324 3325 static bool classof(const Stmt *T) { 3326 return T->getStmtClass() == ConditionalOperatorClass; 3327 } 3328 3329 // Iterators 3330 child_range children() { 3331 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3332 } 3333 const_child_range children() const { 3334 return const_child_range(&SubExprs[0], &SubExprs[0] + END_EXPR); 3335 } 3336}; 3337 3338/// BinaryConditionalOperator - The GNU extension to the conditional 3339/// operator which allows the middle operand to be omitted. 3340/// 3341/// This is a different expression kind on the assumption that almost 3342/// every client ends up needing to know that these are different. 3343class BinaryConditionalOperator : public AbstractConditionalOperator { 3344 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3345 3346 /// - the common condition/left-hand-side expression, which will be 3347 /// evaluated as the opaque value 3348 /// - the condition, expressed in terms of the opaque value 3349 /// - the left-hand-side, expressed in terms of the opaque value 3350 /// - the right-hand-side 3351 Stmt *SubExprs[NUM_SUBEXPRS]; 3352 OpaqueValueExpr *OpaqueValue; 3353 3354 friend class ASTStmtReader; 3355public: 3356 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3357 Expr *cond, Expr *lhs, Expr *rhs, 3358 SourceLocation qloc, SourceLocation cloc, 3359 QualType t, ExprValueKind VK, ExprObjectKind OK) 3360 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3361 (common->isTypeDependent() || rhs->isTypeDependent()), 3362 (common->isValueDependent() || rhs->isValueDependent()), 3363 (common->isInstantiationDependent() || 3364 rhs->isInstantiationDependent()), 3365 (common->containsUnexpandedParameterPack() || 3366 rhs->containsUnexpandedParameterPack()), 3367 qloc, cloc), 3368 OpaqueValue(opaqueValue) { 3369 SubExprs[COMMON] = common; 3370 SubExprs[COND] = cond; 3371 SubExprs[LHS] = lhs; 3372 SubExprs[RHS] = rhs; 3373 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value"); 3374 } 3375 3376 /// \brief Build an empty conditional operator. 3377 explicit BinaryConditionalOperator(EmptyShell Empty) 3378 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3379 3380 /// \brief getCommon - Return the common expression, written to the 3381 /// left of the condition. The opaque value will be bound to the 3382 /// result of this expression. 3383 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3384 3385 /// \brief getOpaqueValue - Return the opaque value placeholder. 3386 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3387 3388 /// \brief getCond - Return the condition expression; this is defined 3389 /// in terms of the opaque value. 3390 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3391 3392 /// \brief getTrueExpr - Return the subexpression which will be 3393 /// evaluated if the condition evaluates to true; this is defined 3394 /// in terms of the opaque value. 3395 Expr *getTrueExpr() const { 3396 return cast<Expr>(SubExprs[LHS]); 3397 } 3398 3399 /// \brief getFalseExpr - Return the subexpression which will be 3400 /// evaluated if the condnition evaluates to false; this is 3401 /// defined in terms of the opaque value. 3402 Expr *getFalseExpr() const { 3403 return cast<Expr>(SubExprs[RHS]); 3404 } 3405 3406 SourceLocation getLocStart() const LLVM_READONLY { 3407 return getCommon()->getLocStart(); 3408 } 3409 SourceLocation getLocEnd() const LLVM_READONLY { 3410 return getFalseExpr()->getLocEnd(); 3411 } 3412 3413 static bool classof(const Stmt *T) { 3414 return T->getStmtClass() == BinaryConditionalOperatorClass; 3415 } 3416 3417 // Iterators 3418 child_range children() { 3419 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3420 } 3421 const_child_range children() const { 3422 return const_child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3423 } 3424}; 3425 3426inline Expr *AbstractConditionalOperator::getCond() const { 3427 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3428 return co->getCond(); 3429 return cast<BinaryConditionalOperator>(this)->getCond(); 3430} 3431 3432inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3433 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3434 return co->getTrueExpr(); 3435 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3436} 3437 3438inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3439 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3440 return co->getFalseExpr(); 3441 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3442} 3443 3444/// AddrLabelExpr - The GNU address of label extension, representing &&label. 3445class AddrLabelExpr : public Expr { 3446 SourceLocation AmpAmpLoc, LabelLoc; 3447 LabelDecl *Label; 3448public: 3449 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3450 QualType t) 3451 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3452 false), 3453 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3454 3455 /// \brief Build an empty address of a label expression. 3456 explicit AddrLabelExpr(EmptyShell Empty) 3457 : Expr(AddrLabelExprClass, Empty) { } 3458 3459 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3460 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3461 SourceLocation getLabelLoc() const { return LabelLoc; } 3462 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3463 3464 SourceLocation getLocStart() const LLVM_READONLY { return AmpAmpLoc; } 3465 SourceLocation getLocEnd() const LLVM_READONLY { return LabelLoc; } 3466 3467 LabelDecl *getLabel() const { return Label; } 3468 void setLabel(LabelDecl *L) { Label = L; } 3469 3470 static bool classof(const Stmt *T) { 3471 return T->getStmtClass() == AddrLabelExprClass; 3472 } 3473 3474 // Iterators 3475 child_range children() { 3476 return child_range(child_iterator(), child_iterator()); 3477 } 3478 const_child_range children() const { 3479 return const_child_range(const_child_iterator(), const_child_iterator()); 3480 } 3481}; 3482 3483/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3484/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3485/// takes the value of the last subexpression. 3486/// 3487/// A StmtExpr is always an r-value; values "returned" out of a 3488/// StmtExpr will be copied. 3489class StmtExpr : public Expr { 3490 Stmt *SubStmt; 3491 SourceLocation LParenLoc, RParenLoc; 3492public: 3493 // FIXME: Does type-dependence need to be computed differently? 3494 // FIXME: Do we need to compute instantiation instantiation-dependence for 3495 // statements? (ugh!) 3496 StmtExpr(CompoundStmt *substmt, QualType T, 3497 SourceLocation lp, SourceLocation rp) : 3498 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3499 T->isDependentType(), false, false, false), 3500 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3501 3502 /// \brief Build an empty statement expression. 3503 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3504 3505 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3506 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3507 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3508 3509 SourceLocation getLocStart() const LLVM_READONLY { return LParenLoc; } 3510 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3511 3512 SourceLocation getLParenLoc() const { return LParenLoc; } 3513 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3514 SourceLocation getRParenLoc() const { return RParenLoc; } 3515 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3516 3517 static bool classof(const Stmt *T) { 3518 return T->getStmtClass() == StmtExprClass; 3519 } 3520 3521 // Iterators 3522 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3523 const_child_range children() const { 3524 return const_child_range(&SubStmt, &SubStmt + 1); 3525 } 3526}; 3527 3528/// ShuffleVectorExpr - clang-specific builtin-in function 3529/// __builtin_shufflevector. 3530/// This AST node represents a operator that does a constant 3531/// shuffle, similar to LLVM's shufflevector instruction. It takes 3532/// two vectors and a variable number of constant indices, 3533/// and returns the appropriately shuffled vector. 3534class ShuffleVectorExpr : public Expr { 3535 SourceLocation BuiltinLoc, RParenLoc; 3536 3537 // SubExprs - the list of values passed to the __builtin_shufflevector 3538 // function. The first two are vectors, and the rest are constant 3539 // indices. The number of values in this list is always 3540 // 2+the number of indices in the vector type. 3541 Stmt **SubExprs; 3542 unsigned NumExprs; 3543 3544public: 3545 ShuffleVectorExpr(const ASTContext &C, ArrayRef<Expr*> args, QualType Type, 3546 SourceLocation BLoc, SourceLocation RP); 3547 3548 /// \brief Build an empty vector-shuffle expression. 3549 explicit ShuffleVectorExpr(EmptyShell Empty) 3550 : Expr(ShuffleVectorExprClass, Empty), SubExprs(nullptr) { } 3551 3552 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3553 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3554 3555 SourceLocation getRParenLoc() const { return RParenLoc; } 3556 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3557 3558 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3559 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3560 3561 static bool classof(const Stmt *T) { 3562 return T->getStmtClass() == ShuffleVectorExprClass; 3563 } 3564 3565 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3566 /// constant expression, the actual arguments passed in, and the function 3567 /// pointers. 3568 unsigned getNumSubExprs() const { return NumExprs; } 3569 3570 /// \brief Retrieve the array of expressions. 3571 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3572 3573 /// getExpr - Return the Expr at the specified index. 3574 Expr *getExpr(unsigned Index) { 3575 assert((Index < NumExprs) && "Arg access out of range!"); 3576 return cast<Expr>(SubExprs[Index]); 3577 } 3578 const Expr *getExpr(unsigned Index) const { 3579 assert((Index < NumExprs) && "Arg access out of range!"); 3580 return cast<Expr>(SubExprs[Index]); 3581 } 3582 3583 void setExprs(const ASTContext &C, ArrayRef<Expr *> Exprs); 3584 3585 llvm::APSInt getShuffleMaskIdx(const ASTContext &Ctx, unsigned N) const { 3586 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3587 return getExpr(N+2)->EvaluateKnownConstInt(Ctx); 3588 } 3589 3590 // Iterators 3591 child_range children() { 3592 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3593 } 3594 const_child_range children() const { 3595 return const_child_range(&SubExprs[0], &SubExprs[0] + NumExprs); 3596 } 3597}; 3598 3599/// ConvertVectorExpr - Clang builtin function __builtin_convertvector 3600/// This AST node provides support for converting a vector type to another 3601/// vector type of the same arity. 3602class ConvertVectorExpr : public Expr { 3603private: 3604 Stmt *SrcExpr; 3605 TypeSourceInfo *TInfo; 3606 SourceLocation BuiltinLoc, RParenLoc; 3607 3608 friend class ASTReader; 3609 friend class ASTStmtReader; 3610 explicit ConvertVectorExpr(EmptyShell Empty) : Expr(ConvertVectorExprClass, Empty) {} 3611 3612public: 3613 ConvertVectorExpr(Expr* SrcExpr, TypeSourceInfo *TI, QualType DstType, 3614 ExprValueKind VK, ExprObjectKind OK, 3615 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 3616 : Expr(ConvertVectorExprClass, DstType, VK, OK, 3617 DstType->isDependentType(), 3618 DstType->isDependentType() || SrcExpr->isValueDependent(), 3619 (DstType->isInstantiationDependentType() || 3620 SrcExpr->isInstantiationDependent()), 3621 (DstType->containsUnexpandedParameterPack() || 3622 SrcExpr->containsUnexpandedParameterPack())), 3623 SrcExpr(SrcExpr), TInfo(TI), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 3624 3625 /// getSrcExpr - Return the Expr to be converted. 3626 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 3627 3628 /// getTypeSourceInfo - Return the destination type. 3629 TypeSourceInfo *getTypeSourceInfo() const { 3630 return TInfo; 3631 } 3632 void setTypeSourceInfo(TypeSourceInfo *ti) { 3633 TInfo = ti; 3634 } 3635 3636 /// getBuiltinLoc - Return the location of the __builtin_convertvector token. 3637 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3638 3639 /// getRParenLoc - Return the location of final right parenthesis. 3640 SourceLocation getRParenLoc() const { return RParenLoc; } 3641 3642 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3643 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3644 3645 static bool classof(const Stmt *T) { 3646 return T->getStmtClass() == ConvertVectorExprClass; 3647 } 3648 3649 // Iterators 3650 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 3651 const_child_range children() const { 3652 return const_child_range(&SrcExpr, &SrcExpr + 1); 3653 } 3654}; 3655 3656/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3657/// This AST node is similar to the conditional operator (?:) in C, with 3658/// the following exceptions: 3659/// - the test expression must be a integer constant expression. 3660/// - the expression returned acts like the chosen subexpression in every 3661/// visible way: the type is the same as that of the chosen subexpression, 3662/// and all predicates (whether it's an l-value, whether it's an integer 3663/// constant expression, etc.) return the same result as for the chosen 3664/// sub-expression. 3665class ChooseExpr : public Expr { 3666 enum { COND, LHS, RHS, END_EXPR }; 3667 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3668 SourceLocation BuiltinLoc, RParenLoc; 3669 bool CondIsTrue; 3670public: 3671 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3672 QualType t, ExprValueKind VK, ExprObjectKind OK, 3673 SourceLocation RP, bool condIsTrue, 3674 bool TypeDependent, bool ValueDependent) 3675 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3676 (cond->isInstantiationDependent() || 3677 lhs->isInstantiationDependent() || 3678 rhs->isInstantiationDependent()), 3679 (cond->containsUnexpandedParameterPack() || 3680 lhs->containsUnexpandedParameterPack() || 3681 rhs->containsUnexpandedParameterPack())), 3682 BuiltinLoc(BLoc), RParenLoc(RP), CondIsTrue(condIsTrue) { 3683 SubExprs[COND] = cond; 3684 SubExprs[LHS] = lhs; 3685 SubExprs[RHS] = rhs; 3686 } 3687 3688 /// \brief Build an empty __builtin_choose_expr. 3689 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3690 3691 /// isConditionTrue - Return whether the condition is true (i.e. not 3692 /// equal to zero). 3693 bool isConditionTrue() const { 3694 assert(!isConditionDependent() && 3695 "Dependent condition isn't true or false"); 3696 return CondIsTrue; 3697 } 3698 void setIsConditionTrue(bool isTrue) { CondIsTrue = isTrue; } 3699 3700 bool isConditionDependent() const { 3701 return getCond()->isTypeDependent() || getCond()->isValueDependent(); 3702 } 3703 3704 /// getChosenSubExpr - Return the subexpression chosen according to the 3705 /// condition. 3706 Expr *getChosenSubExpr() const { 3707 return isConditionTrue() ? getLHS() : getRHS(); 3708 } 3709 3710 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3711 void setCond(Expr *E) { SubExprs[COND] = E; } 3712 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3713 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3714 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3715 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3716 3717 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3718 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3719 3720 SourceLocation getRParenLoc() const { return RParenLoc; } 3721 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3722 3723 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3724 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3725 3726 static bool classof(const Stmt *T) { 3727 return T->getStmtClass() == ChooseExprClass; 3728 } 3729 3730 // Iterators 3731 child_range children() { 3732 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3733 } 3734 const_child_range children() const { 3735 return const_child_range(&SubExprs[0], &SubExprs[0] + END_EXPR); 3736 } 3737}; 3738 3739/// GNUNullExpr - Implements the GNU __null extension, which is a name 3740/// for a null pointer constant that has integral type (e.g., int or 3741/// long) and is the same size and alignment as a pointer. The __null 3742/// extension is typically only used by system headers, which define 3743/// NULL as __null in C++ rather than using 0 (which is an integer 3744/// that may not match the size of a pointer). 3745class GNUNullExpr : public Expr { 3746 /// TokenLoc - The location of the __null keyword. 3747 SourceLocation TokenLoc; 3748 3749public: 3750 GNUNullExpr(QualType Ty, SourceLocation Loc) 3751 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3752 false), 3753 TokenLoc(Loc) { } 3754 3755 /// \brief Build an empty GNU __null expression. 3756 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3757 3758 /// getTokenLocation - The location of the __null token. 3759 SourceLocation getTokenLocation() const { return TokenLoc; } 3760 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3761 3762 SourceLocation getLocStart() const LLVM_READONLY { return TokenLoc; } 3763 SourceLocation getLocEnd() const LLVM_READONLY { return TokenLoc; } 3764 3765 static bool classof(const Stmt *T) { 3766 return T->getStmtClass() == GNUNullExprClass; 3767 } 3768 3769 // Iterators 3770 child_range children() { 3771 return child_range(child_iterator(), child_iterator()); 3772 } 3773 const_child_range children() const { 3774 return const_child_range(const_child_iterator(), const_child_iterator()); 3775 } 3776}; 3777 3778/// Represents a call to the builtin function \c __builtin_va_arg. 3779class VAArgExpr : public Expr { 3780 Stmt *Val; 3781 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfo; 3782 SourceLocation BuiltinLoc, RParenLoc; 3783public: 3784 VAArgExpr(SourceLocation BLoc, Expr *e, TypeSourceInfo *TInfo, 3785 SourceLocation RPLoc, QualType t, bool IsMS) 3786 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, t->isDependentType(), 3787 false, (TInfo->getType()->isInstantiationDependentType() || 3788 e->isInstantiationDependent()), 3789 (TInfo->getType()->containsUnexpandedParameterPack() || 3790 e->containsUnexpandedParameterPack())), 3791 Val(e), TInfo(TInfo, IsMS), BuiltinLoc(BLoc), RParenLoc(RPLoc) {} 3792 3793 /// Create an empty __builtin_va_arg expression. 3794 explicit VAArgExpr(EmptyShell Empty) 3795 : Expr(VAArgExprClass, Empty), Val(nullptr), TInfo(nullptr, false) {} 3796 3797 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3798 Expr *getSubExpr() { return cast<Expr>(Val); } 3799 void setSubExpr(Expr *E) { Val = E; } 3800 3801 /// Returns whether this is really a Win64 ABI va_arg expression. 3802 bool isMicrosoftABI() const { return TInfo.getInt(); } 3803 void setIsMicrosoftABI(bool IsMS) { TInfo.setInt(IsMS); } 3804 3805 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo.getPointer(); } 3806 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo.setPointer(TI); } 3807 3808 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3809 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3810 3811 SourceLocation getRParenLoc() const { return RParenLoc; } 3812 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3813 3814 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 3815 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 3816 3817 static bool classof(const Stmt *T) { 3818 return T->getStmtClass() == VAArgExprClass; 3819 } 3820 3821 // Iterators 3822 child_range children() { return child_range(&Val, &Val+1); } 3823 const_child_range children() const { 3824 return const_child_range(&Val, &Val + 1); 3825 } 3826}; 3827 3828/// @brief Describes an C or C++ initializer list. 3829/// 3830/// InitListExpr describes an initializer list, which can be used to 3831/// initialize objects of different types, including 3832/// struct/class/union types, arrays, and vectors. For example: 3833/// 3834/// @code 3835/// struct foo x = { 1, { 2, 3 } }; 3836/// @endcode 3837/// 3838/// Prior to semantic analysis, an initializer list will represent the 3839/// initializer list as written by the user, but will have the 3840/// placeholder type "void". This initializer list is called the 3841/// syntactic form of the initializer, and may contain C99 designated 3842/// initializers (represented as DesignatedInitExprs), initializations 3843/// of subobject members without explicit braces, and so on. Clients 3844/// interested in the original syntax of the initializer list should 3845/// use the syntactic form of the initializer list. 3846/// 3847/// After semantic analysis, the initializer list will represent the 3848/// semantic form of the initializer, where the initializations of all 3849/// subobjects are made explicit with nested InitListExpr nodes and 3850/// C99 designators have been eliminated by placing the designated 3851/// initializations into the subobject they initialize. Additionally, 3852/// any "holes" in the initialization, where no initializer has been 3853/// specified for a particular subobject, will be replaced with 3854/// implicitly-generated ImplicitValueInitExpr expressions that 3855/// value-initialize the subobjects. Note, however, that the 3856/// initializer lists may still have fewer initializers than there are 3857/// elements to initialize within the object. 3858/// 3859/// After semantic analysis has completed, given an initializer list, 3860/// method isSemanticForm() returns true if and only if this is the 3861/// semantic form of the initializer list (note: the same AST node 3862/// may at the same time be the syntactic form). 3863/// Given the semantic form of the initializer list, one can retrieve 3864/// the syntactic form of that initializer list (when different) 3865/// using method getSyntacticForm(); the method returns null if applied 3866/// to a initializer list which is already in syntactic form. 3867/// Similarly, given the syntactic form (i.e., an initializer list such 3868/// that isSemanticForm() returns false), one can retrieve the semantic 3869/// form using method getSemanticForm(). 3870/// Since many initializer lists have the same syntactic and semantic forms, 3871/// getSyntacticForm() may return NULL, indicating that the current 3872/// semantic initializer list also serves as its syntactic form. 3873class InitListExpr : public Expr { 3874 // FIXME: Eliminate this vector in favor of ASTContext allocation 3875 typedef ASTVector<Stmt *> InitExprsTy; 3876 InitExprsTy InitExprs; 3877 SourceLocation LBraceLoc, RBraceLoc; 3878 3879 /// The alternative form of the initializer list (if it exists). 3880 /// The int part of the pair stores whether this initializer list is 3881 /// in semantic form. If not null, the pointer points to: 3882 /// - the syntactic form, if this is in semantic form; 3883 /// - the semantic form, if this is in syntactic form. 3884 llvm::PointerIntPair<InitListExpr *, 1, bool> AltForm; 3885 3886 /// \brief Either: 3887 /// If this initializer list initializes an array with more elements than 3888 /// there are initializers in the list, specifies an expression to be used 3889 /// for value initialization of the rest of the elements. 3890 /// Or 3891 /// If this initializer list initializes a union, specifies which 3892 /// field within the union will be initialized. 3893 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3894 3895public: 3896 InitListExpr(const ASTContext &C, SourceLocation lbraceloc, 3897 ArrayRef<Expr*> initExprs, SourceLocation rbraceloc); 3898 3899 /// \brief Build an empty initializer list. 3900 explicit InitListExpr(EmptyShell Empty) 3901 : Expr(InitListExprClass, Empty), AltForm(nullptr, true) { } 3902 3903 unsigned getNumInits() const { return InitExprs.size(); } 3904 3905 /// \brief Retrieve the set of initializers. 3906 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3907 3908 /// \brief Retrieve the set of initializers. 3909 Expr * const *getInits() const { 3910 return reinterpret_cast<Expr * const *>(InitExprs.data()); 3911 } 3912 3913 ArrayRef<Expr *> inits() { 3914 return llvm::makeArrayRef(getInits(), getNumInits()); 3915 } 3916 3917 ArrayRef<Expr *> inits() const { 3918 return llvm::makeArrayRef(getInits(), getNumInits()); 3919 } 3920 3921 const Expr *getInit(unsigned Init) const { 3922 assert(Init < getNumInits() && "Initializer access out of range!"); 3923 return cast_or_null<Expr>(InitExprs[Init]); 3924 } 3925 3926 Expr *getInit(unsigned Init) { 3927 assert(Init < getNumInits() && "Initializer access out of range!"); 3928 return cast_or_null<Expr>(InitExprs[Init]); 3929 } 3930 3931 void setInit(unsigned Init, Expr *expr) { 3932 assert(Init < getNumInits() && "Initializer access out of range!"); 3933 InitExprs[Init] = expr; 3934 3935 if (expr) { 3936 ExprBits.TypeDependent |= expr->isTypeDependent(); 3937 ExprBits.ValueDependent |= expr->isValueDependent(); 3938 ExprBits.InstantiationDependent |= expr->isInstantiationDependent(); 3939 ExprBits.ContainsUnexpandedParameterPack |= 3940 expr->containsUnexpandedParameterPack(); 3941 } 3942 } 3943 3944 /// \brief Reserve space for some number of initializers. 3945 void reserveInits(const ASTContext &C, unsigned NumInits); 3946 3947 /// @brief Specify the number of initializers 3948 /// 3949 /// If there are more than @p NumInits initializers, the remaining 3950 /// initializers will be destroyed. If there are fewer than @p 3951 /// NumInits initializers, NULL expressions will be added for the 3952 /// unknown initializers. 3953 void resizeInits(const ASTContext &Context, unsigned NumInits); 3954 3955 /// @brief Updates the initializer at index @p Init with the new 3956 /// expression @p expr, and returns the old expression at that 3957 /// location. 3958 /// 3959 /// When @p Init is out of range for this initializer list, the 3960 /// initializer list will be extended with NULL expressions to 3961 /// accommodate the new entry. 3962 Expr *updateInit(const ASTContext &C, unsigned Init, Expr *expr); 3963 3964 /// \brief If this initializer list initializes an array with more elements 3965 /// than there are initializers in the list, specifies an expression to be 3966 /// used for value initialization of the rest of the elements. 3967 Expr *getArrayFiller() { 3968 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3969 } 3970 const Expr *getArrayFiller() const { 3971 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3972 } 3973 void setArrayFiller(Expr *filler); 3974 3975 /// \brief Return true if this is an array initializer and its array "filler" 3976 /// has been set. 3977 bool hasArrayFiller() const { return getArrayFiller(); } 3978 3979 /// \brief If this initializes a union, specifies which field in the 3980 /// union to initialize. 3981 /// 3982 /// Typically, this field is the first named field within the 3983 /// union. However, a designated initializer can specify the 3984 /// initialization of a different field within the union. 3985 FieldDecl *getInitializedFieldInUnion() { 3986 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3987 } 3988 const FieldDecl *getInitializedFieldInUnion() const { 3989 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3990 } 3991 void setInitializedFieldInUnion(FieldDecl *FD) { 3992 assert((FD == nullptr 3993 || getInitializedFieldInUnion() == nullptr 3994 || getInitializedFieldInUnion() == FD) 3995 && "Only one field of a union may be initialized at a time!"); 3996 ArrayFillerOrUnionFieldInit = FD; 3997 } 3998 3999 // Explicit InitListExpr's originate from source code (and have valid source 4000 // locations). Implicit InitListExpr's are created by the semantic analyzer. 4001 bool isExplicit() const { 4002 return LBraceLoc.isValid() && RBraceLoc.isValid(); 4003 } 4004 4005 // Is this an initializer for an array of characters, initialized by a string 4006 // literal or an @encode? 4007 bool isStringLiteralInit() const; 4008 4009 /// Is this a transparent initializer list (that is, an InitListExpr that is 4010 /// purely syntactic, and whose semantics are that of the sole contained 4011 /// initializer)? 4012 bool isTransparent() const; 4013 4014 /// Is this the zero initializer {0} in a language which considers it 4015 /// idiomatic? 4016 bool isIdiomaticZeroInitializer(const LangOptions &LangOpts) const; 4017 4018 SourceLocation getLBraceLoc() const { return LBraceLoc; } 4019 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 4020 SourceLocation getRBraceLoc() const { return RBraceLoc; } 4021 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 4022 4023 bool isSemanticForm() const { return AltForm.getInt(); } 4024 InitListExpr *getSemanticForm() const { 4025 return isSemanticForm() ? nullptr : AltForm.getPointer(); 4026 } 4027 bool isSyntacticForm() const { 4028 return !AltForm.getInt() || !AltForm.getPointer(); 4029 } 4030 InitListExpr *getSyntacticForm() const { 4031 return isSemanticForm() ? AltForm.getPointer() : nullptr; 4032 } 4033 4034 void setSyntacticForm(InitListExpr *Init) { 4035 AltForm.setPointer(Init); 4036 AltForm.setInt(true); 4037 Init->AltForm.setPointer(this); 4038 Init->AltForm.setInt(false); 4039 } 4040 4041 bool hadArrayRangeDesignator() const { 4042 return InitListExprBits.HadArrayRangeDesignator != 0; 4043 } 4044 void sawArrayRangeDesignator(bool ARD = true) { 4045 InitListExprBits.HadArrayRangeDesignator = ARD; 4046 } 4047 4048 SourceLocation getLocStart() const LLVM_READONLY; 4049 SourceLocation getLocEnd() const LLVM_READONLY; 4050 4051 static bool classof(const Stmt *T) { 4052 return T->getStmtClass() == InitListExprClass; 4053 } 4054 4055 // Iterators 4056 child_range children() { 4057 const_child_range CCR = const_cast<const InitListExpr *>(this)->children(); 4058 return child_range(cast_away_const(CCR.begin()), 4059 cast_away_const(CCR.end())); 4060 } 4061 4062 const_child_range children() const { 4063 // FIXME: This does not include the array filler expression. 4064 if (InitExprs.empty()) 4065 return const_child_range(const_child_iterator(), const_child_iterator()); 4066 return const_child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 4067 } 4068 4069 typedef InitExprsTy::iterator iterator; 4070 typedef InitExprsTy::const_iterator const_iterator; 4071 typedef InitExprsTy::reverse_iterator reverse_iterator; 4072 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 4073 4074 iterator begin() { return InitExprs.begin(); } 4075 const_iterator begin() const { return InitExprs.begin(); } 4076 iterator end() { return InitExprs.end(); } 4077 const_iterator end() const { return InitExprs.end(); } 4078 reverse_iterator rbegin() { return InitExprs.rbegin(); } 4079 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 4080 reverse_iterator rend() { return InitExprs.rend(); } 4081 const_reverse_iterator rend() const { return InitExprs.rend(); } 4082 4083 friend class ASTStmtReader; 4084 friend class ASTStmtWriter; 4085}; 4086 4087/// @brief Represents a C99 designated initializer expression. 4088/// 4089/// A designated initializer expression (C99 6.7.8) contains one or 4090/// more designators (which can be field designators, array 4091/// designators, or GNU array-range designators) followed by an 4092/// expression that initializes the field or element(s) that the 4093/// designators refer to. For example, given: 4094/// 4095/// @code 4096/// struct point { 4097/// double x; 4098/// double y; 4099/// }; 4100/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 4101/// @endcode 4102/// 4103/// The InitListExpr contains three DesignatedInitExprs, the first of 4104/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 4105/// designators, one array designator for @c [2] followed by one field 4106/// designator for @c .y. The initialization expression will be 1.0. 4107class DesignatedInitExpr final 4108 : public Expr, 4109 private llvm::TrailingObjects<DesignatedInitExpr, Stmt *> { 4110public: 4111 /// \brief Forward declaration of the Designator class. 4112 class Designator; 4113 4114private: 4115 /// The location of the '=' or ':' prior to the actual initializer 4116 /// expression. 4117 SourceLocation EqualOrColonLoc; 4118 4119 /// Whether this designated initializer used the GNU deprecated 4120 /// syntax rather than the C99 '=' syntax. 4121 unsigned GNUSyntax : 1; 4122 4123 /// The number of designators in this initializer expression. 4124 unsigned NumDesignators : 15; 4125 4126 /// The number of subexpressions of this initializer expression, 4127 /// which contains both the initializer and any additional 4128 /// expressions used by array and array-range designators. 4129 unsigned NumSubExprs : 16; 4130 4131 /// \brief The designators in this designated initialization 4132 /// expression. 4133 Designator *Designators; 4134 4135 DesignatedInitExpr(const ASTContext &C, QualType Ty, 4136 llvm::ArrayRef<Designator> Designators, 4137 SourceLocation EqualOrColonLoc, bool GNUSyntax, 4138 ArrayRef<Expr *> IndexExprs, Expr *Init); 4139 4140 explicit DesignatedInitExpr(unsigned NumSubExprs) 4141 : Expr(DesignatedInitExprClass, EmptyShell()), 4142 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(nullptr) { } 4143 4144public: 4145 /// A field designator, e.g., ".x". 4146 struct FieldDesignator { 4147 /// Refers to the field that is being initialized. The low bit 4148 /// of this field determines whether this is actually a pointer 4149 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 4150 /// initially constructed, a field designator will store an 4151 /// IdentifierInfo*. After semantic analysis has resolved that 4152 /// name, the field designator will instead store a FieldDecl*. 4153 uintptr_t NameOrField; 4154 4155 /// The location of the '.' in the designated initializer. 4156 unsigned DotLoc; 4157 4158 /// The location of the field name in the designated initializer. 4159 unsigned FieldLoc; 4160 }; 4161 4162 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 4163 struct ArrayOrRangeDesignator { 4164 /// Location of the first index expression within the designated 4165 /// initializer expression's list of subexpressions. 4166 unsigned Index; 4167 /// The location of the '[' starting the array range designator. 4168 unsigned LBracketLoc; 4169 /// The location of the ellipsis separating the start and end 4170 /// indices. Only valid for GNU array-range designators. 4171 unsigned EllipsisLoc; 4172 /// The location of the ']' terminating the array range designator. 4173 unsigned RBracketLoc; 4174 }; 4175 4176 /// @brief Represents a single C99 designator. 4177 /// 4178 /// @todo This class is infuriatingly similar to clang::Designator, 4179 /// but minor differences (storing indices vs. storing pointers) 4180 /// keep us from reusing it. Try harder, later, to rectify these 4181 /// differences. 4182 class Designator { 4183 /// @brief The kind of designator this describes. 4184 enum { 4185 FieldDesignator, 4186 ArrayDesignator, 4187 ArrayRangeDesignator 4188 } Kind; 4189 4190 union { 4191 /// A field designator, e.g., ".x". 4192 struct FieldDesignator Field; 4193 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 4194 struct ArrayOrRangeDesignator ArrayOrRange; 4195 }; 4196 friend class DesignatedInitExpr; 4197 4198 public: 4199 Designator() {} 4200 4201 /// @brief Initializes a field designator. 4202 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 4203 SourceLocation FieldLoc) 4204 : Kind(FieldDesignator) { 4205 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 4206 Field.DotLoc = DotLoc.getRawEncoding(); 4207 Field.FieldLoc = FieldLoc.getRawEncoding(); 4208 } 4209 4210 /// @brief Initializes an array designator. 4211 Designator(unsigned Index, SourceLocation LBracketLoc, 4212 SourceLocation RBracketLoc) 4213 : Kind(ArrayDesignator) { 4214 ArrayOrRange.Index = Index; 4215 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 4216 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 4217 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 4218 } 4219 4220 /// @brief Initializes a GNU array-range designator. 4221 Designator(unsigned Index, SourceLocation LBracketLoc, 4222 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 4223 : Kind(ArrayRangeDesignator) { 4224 ArrayOrRange.Index = Index; 4225 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 4226 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 4227 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 4228 } 4229 4230 bool isFieldDesignator() const { return Kind == FieldDesignator; } 4231 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 4232 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 4233 4234 IdentifierInfo *getFieldName() const; 4235 4236 FieldDecl *getField() const { 4237 assert(Kind == FieldDesignator && "Only valid on a field designator"); 4238 if (Field.NameOrField & 0x01) 4239 return nullptr; 4240 else 4241 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 4242 } 4243 4244 void setField(FieldDecl *FD) { 4245 assert(Kind == FieldDesignator && "Only valid on a field designator"); 4246 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 4247 } 4248 4249 SourceLocation getDotLoc() const { 4250 assert(Kind == FieldDesignator && "Only valid on a field designator"); 4251 return SourceLocation::getFromRawEncoding(Field.DotLoc); 4252 } 4253 4254 SourceLocation getFieldLoc() const { 4255 assert(Kind == FieldDesignator && "Only valid on a field designator"); 4256 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 4257 } 4258 4259 SourceLocation getLBracketLoc() const { 4260 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 4261 "Only valid on an array or array-range designator"); 4262 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 4263 } 4264 4265 SourceLocation getRBracketLoc() const { 4266 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 4267 "Only valid on an array or array-range designator"); 4268 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 4269 } 4270 4271 SourceLocation getEllipsisLoc() const { 4272 assert(Kind == ArrayRangeDesignator && 4273 "Only valid on an array-range designator"); 4274 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 4275 } 4276 4277 unsigned getFirstExprIndex() const { 4278 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 4279 "Only valid on an array or array-range designator"); 4280 return ArrayOrRange.Index; 4281 } 4282 4283 SourceLocation getLocStart() const LLVM_READONLY { 4284 if (Kind == FieldDesignator) 4285 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 4286 else 4287 return getLBracketLoc(); 4288 } 4289 SourceLocation getLocEnd() const LLVM_READONLY { 4290 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 4291 } 4292 SourceRange getSourceRange() const LLVM_READONLY { 4293 return SourceRange(getLocStart(), getLocEnd()); 4294 } 4295 }; 4296 4297 static DesignatedInitExpr *Create(const ASTContext &C, 4298 llvm::ArrayRef<Designator> Designators, 4299 ArrayRef<Expr*> IndexExprs, 4300 SourceLocation EqualOrColonLoc, 4301 bool GNUSyntax, Expr *Init); 4302 4303 static DesignatedInitExpr *CreateEmpty(const ASTContext &C, 4304 unsigned NumIndexExprs); 4305 4306 /// @brief Returns the number of designators in this initializer. 4307 unsigned size() const { return NumDesignators; } 4308 4309 // Iterator access to the designators. 4310 llvm::MutableArrayRef<Designator> designators() { 4311 return {Designators, NumDesignators}; 4312 } 4313 4314 llvm::ArrayRef<Designator> designators() const { 4315 return {Designators, NumDesignators}; 4316 } 4317 4318 Designator *getDesignator(unsigned Idx) { return &designators()[Idx]; } 4319 const Designator *getDesignator(unsigned Idx) const { 4320 return &designators()[Idx]; 4321 } 4322 4323 void setDesignators(const ASTContext &C, const Designator *Desigs, 4324 unsigned NumDesigs); 4325 4326 Expr *getArrayIndex(const Designator &D) const; 4327 Expr *getArrayRangeStart(const Designator &D) const; 4328 Expr *getArrayRangeEnd(const Designator &D) const; 4329 4330 /// @brief Retrieve the location of the '=' that precedes the 4331 /// initializer value itself, if present. 4332 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 4333 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 4334 4335 /// @brief Determines whether this designated initializer used the 4336 /// deprecated GNU syntax for designated initializers. 4337 bool usesGNUSyntax() const { return GNUSyntax; } 4338 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 4339 4340 /// @brief Retrieve the initializer value. 4341 Expr *getInit() const { 4342 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 4343 } 4344 4345 void setInit(Expr *init) { 4346 *child_begin() = init; 4347 } 4348 4349 /// \brief Retrieve the total number of subexpressions in this 4350 /// designated initializer expression, including the actual 4351 /// initialized value and any expressions that occur within array 4352 /// and array-range designators. 4353 unsigned getNumSubExprs() const { return NumSubExprs; } 4354 4355 Expr *getSubExpr(unsigned Idx) const { 4356 assert(Idx < NumSubExprs && "Subscript out of range"); 4357 return cast<Expr>(getTrailingObjects<Stmt *>()[Idx]); 4358 } 4359 4360 void setSubExpr(unsigned Idx, Expr *E) { 4361 assert(Idx < NumSubExprs && "Subscript out of range"); 4362 getTrailingObjects<Stmt *>()[Idx] = E; 4363 } 4364 4365 /// \brief Replaces the designator at index @p Idx with the series 4366 /// of designators in [First, Last). 4367 void ExpandDesignator(const ASTContext &C, unsigned Idx, 4368 const Designator *First, const Designator *Last); 4369 4370 SourceRange getDesignatorsSourceRange() const; 4371 4372 SourceLocation getLocStart() const LLVM_READONLY; 4373 SourceLocation getLocEnd() const LLVM_READONLY; 4374 4375 static bool classof(const Stmt *T) { 4376 return T->getStmtClass() == DesignatedInitExprClass; 4377 } 4378 4379 // Iterators 4380 child_range children() { 4381 Stmt **begin = getTrailingObjects<Stmt *>(); 4382 return child_range(begin, begin + NumSubExprs); 4383 } 4384 const_child_range children() const { 4385 Stmt * const *begin = getTrailingObjects<Stmt *>(); 4386 return const_child_range(begin, begin + NumSubExprs); 4387 } 4388 4389 friend TrailingObjects; 4390}; 4391 4392/// \brief Represents a place-holder for an object not to be initialized by 4393/// anything. 4394/// 4395/// This only makes sense when it appears as part of an updater of a 4396/// DesignatedInitUpdateExpr (see below). The base expression of a DIUE 4397/// initializes a big object, and the NoInitExpr's mark the spots within the 4398/// big object not to be overwritten by the updater. 4399/// 4400/// \see DesignatedInitUpdateExpr 4401class NoInitExpr : public Expr { 4402public: 4403 explicit NoInitExpr(QualType ty) 4404 : Expr(NoInitExprClass, ty, VK_RValue, OK_Ordinary, 4405 false, false, ty->isInstantiationDependentType(), false) { } 4406 4407 explicit NoInitExpr(EmptyShell Empty) 4408 : Expr(NoInitExprClass, Empty) { } 4409 4410 static bool classof(const Stmt *T) { 4411 return T->getStmtClass() == NoInitExprClass; 4412 } 4413 4414 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); } 4415 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); } 4416 4417 // Iterators 4418 child_range children() { 4419 return child_range(child_iterator(), child_iterator()); 4420 } 4421 const_child_range children() const { 4422 return const_child_range(const_child_iterator(), const_child_iterator()); 4423 } 4424}; 4425 4426// In cases like: 4427// struct Q { int a, b, c; }; 4428// Q *getQ(); 4429// void foo() { 4430// struct A { Q q; } a = { *getQ(), .q.b = 3 }; 4431// } 4432// 4433// We will have an InitListExpr for a, with type A, and then a 4434// DesignatedInitUpdateExpr for "a.q" with type Q. The "base" for this DIUE 4435// is the call expression *getQ(); the "updater" for the DIUE is ".q.b = 3" 4436// 4437class DesignatedInitUpdateExpr : public Expr { 4438 // BaseAndUpdaterExprs[0] is the base expression; 4439 // BaseAndUpdaterExprs[1] is an InitListExpr overwriting part of the base. 4440 Stmt *BaseAndUpdaterExprs[2]; 4441 4442public: 4443 DesignatedInitUpdateExpr(const ASTContext &C, SourceLocation lBraceLoc, 4444 Expr *baseExprs, SourceLocation rBraceLoc); 4445 4446 explicit DesignatedInitUpdateExpr(EmptyShell Empty) 4447 : Expr(DesignatedInitUpdateExprClass, Empty) { } 4448 4449 SourceLocation getLocStart() const LLVM_READONLY; 4450 SourceLocation getLocEnd() const LLVM_READONLY; 4451 4452 static bool classof(const Stmt *T) { 4453 return T->getStmtClass() == DesignatedInitUpdateExprClass; 4454 } 4455 4456 Expr *getBase() const { return cast<Expr>(BaseAndUpdaterExprs[0]); } 4457 void setBase(Expr *Base) { BaseAndUpdaterExprs[0] = Base; } 4458 4459 InitListExpr *getUpdater() const { 4460 return cast<InitListExpr>(BaseAndUpdaterExprs[1]); 4461 } 4462 void setUpdater(Expr *Updater) { BaseAndUpdaterExprs[1] = Updater; } 4463 4464 // Iterators 4465 // children = the base and the updater 4466 child_range children() { 4467 return child_range(&BaseAndUpdaterExprs[0], &BaseAndUpdaterExprs[0] + 2); 4468 } 4469 const_child_range children() const { 4470 return const_child_range(&BaseAndUpdaterExprs[0], 4471 &BaseAndUpdaterExprs[0] + 2); 4472 } 4473}; 4474 4475/// \brief Represents a loop initializing the elements of an array. 4476/// 4477/// The need to initialize the elements of an array occurs in a number of 4478/// contexts: 4479/// 4480/// * in the implicit copy/move constructor for a class with an array member 4481/// * when a lambda-expression captures an array by value 4482/// * when a decomposition declaration decomposes an array 4483/// 4484/// There are two subexpressions: a common expression (the source array) 4485/// that is evaluated once up-front, and a per-element initializer that 4486/// runs once for each array element. 4487/// 4488/// Within the per-element initializer, the common expression may be referenced 4489/// via an OpaqueValueExpr, and the current index may be obtained via an 4490/// ArrayInitIndexExpr. 4491class ArrayInitLoopExpr : public Expr { 4492 Stmt *SubExprs[2]; 4493 4494 explicit ArrayInitLoopExpr(EmptyShell Empty) 4495 : Expr(ArrayInitLoopExprClass, Empty), SubExprs{} {} 4496 4497public: 4498 explicit ArrayInitLoopExpr(QualType T, Expr *CommonInit, Expr *ElementInit) 4499 : Expr(ArrayInitLoopExprClass, T, VK_RValue, OK_Ordinary, false, 4500 CommonInit->isValueDependent() || ElementInit->isValueDependent(), 4501 T->isInstantiationDependentType(), 4502 CommonInit->containsUnexpandedParameterPack() || 4503 ElementInit->containsUnexpandedParameterPack()), 4504 SubExprs{CommonInit, ElementInit} {} 4505 4506 /// Get the common subexpression shared by all initializations (the source 4507 /// array). 4508 OpaqueValueExpr *getCommonExpr() const { 4509 return cast<OpaqueValueExpr>(SubExprs[0]); 4510 } 4511 4512 /// Get the initializer to use for each array element. 4513 Expr *getSubExpr() const { return cast<Expr>(SubExprs[1]); } 4514 4515 llvm::APInt getArraySize() const { 4516 return cast<ConstantArrayType>(getType()->castAsArrayTypeUnsafe()) 4517 ->getSize(); 4518 } 4519 4520 static bool classof(const Stmt *S) { 4521 return S->getStmtClass() == ArrayInitLoopExprClass; 4522 } 4523 4524 SourceLocation getLocStart() const LLVM_READONLY { 4525 return getCommonExpr()->getLocStart(); 4526 } 4527 SourceLocation getLocEnd() const LLVM_READONLY { 4528 return getCommonExpr()->getLocEnd(); 4529 } 4530 4531 child_range children() { 4532 return child_range(SubExprs, SubExprs + 2); 4533 } 4534 const_child_range children() const { 4535 return const_child_range(SubExprs, SubExprs + 2); 4536 } 4537 4538 friend class ASTReader; 4539 friend class ASTStmtReader; 4540 friend class ASTStmtWriter; 4541}; 4542 4543/// \brief Represents the index of the current element of an array being 4544/// initialized by an ArrayInitLoopExpr. This can only appear within the 4545/// subexpression of an ArrayInitLoopExpr. 4546class ArrayInitIndexExpr : public Expr { 4547 explicit ArrayInitIndexExpr(EmptyShell Empty) 4548 : Expr(ArrayInitIndexExprClass, Empty) {} 4549 4550public: 4551 explicit ArrayInitIndexExpr(QualType T) 4552 : Expr(ArrayInitIndexExprClass, T, VK_RValue, OK_Ordinary, 4553 false, false, false, false) {} 4554 4555 static bool classof(const Stmt *S) { 4556 return S->getStmtClass() == ArrayInitIndexExprClass; 4557 } 4558 4559 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); } 4560 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); } 4561 4562 child_range children() { 4563 return child_range(child_iterator(), child_iterator()); 4564 } 4565 const_child_range children() const { 4566 return const_child_range(const_child_iterator(), const_child_iterator()); 4567 } 4568 4569 friend class ASTReader; 4570 friend class ASTStmtReader; 4571}; 4572 4573/// \brief Represents an implicitly-generated value initialization of 4574/// an object of a given type. 4575/// 4576/// Implicit value initializations occur within semantic initializer 4577/// list expressions (InitListExpr) as placeholders for subobject 4578/// initializations not explicitly specified by the user. 4579/// 4580/// \see InitListExpr 4581class ImplicitValueInitExpr : public Expr { 4582public: 4583 explicit ImplicitValueInitExpr(QualType ty) 4584 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 4585 false, false, ty->isInstantiationDependentType(), false) { } 4586 4587 /// \brief Construct an empty implicit value initialization. 4588 explicit ImplicitValueInitExpr(EmptyShell Empty) 4589 : Expr(ImplicitValueInitExprClass, Empty) { } 4590 4591 static bool classof(const Stmt *T) { 4592 return T->getStmtClass() == ImplicitValueInitExprClass; 4593 } 4594 4595 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); } 4596 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); } 4597 4598 // Iterators 4599 child_range children() { 4600 return child_range(child_iterator(), child_iterator()); 4601 } 4602 const_child_range children() const { 4603 return const_child_range(const_child_iterator(), const_child_iterator()); 4604 } 4605}; 4606 4607class ParenListExpr : public Expr { 4608 Stmt **Exprs; 4609 unsigned NumExprs; 4610 SourceLocation LParenLoc, RParenLoc; 4611 4612public: 4613 ParenListExpr(const ASTContext& C, SourceLocation lparenloc, 4614 ArrayRef<Expr*> exprs, SourceLocation rparenloc); 4615 4616 /// \brief Build an empty paren list. 4617 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 4618 4619 unsigned getNumExprs() const { return NumExprs; } 4620 4621 const Expr* getExpr(unsigned Init) const { 4622 assert(Init < getNumExprs() && "Initializer access out of range!"); 4623 return cast_or_null<Expr>(Exprs[Init]); 4624 } 4625 4626 Expr* getExpr(unsigned Init) { 4627 assert(Init < getNumExprs() && "Initializer access out of range!"); 4628 return cast_or_null<Expr>(Exprs[Init]); 4629 } 4630 4631 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 4632 4633 ArrayRef<Expr *> exprs() { 4634 return llvm::makeArrayRef(getExprs(), getNumExprs()); 4635 } 4636 4637 SourceLocation getLParenLoc() const { return LParenLoc; } 4638 SourceLocation getRParenLoc() const { return RParenLoc; } 4639 4640 SourceLocation getLocStart() const LLVM_READONLY { return LParenLoc; } 4641 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4642 4643 static bool classof(const Stmt *T) { 4644 return T->getStmtClass() == ParenListExprClass; 4645 } 4646 4647 // Iterators 4648 child_range children() { 4649 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4650 } 4651 const_child_range children() const { 4652 return const_child_range(&Exprs[0], &Exprs[0] + NumExprs); 4653 } 4654 4655 friend class ASTStmtReader; 4656 friend class ASTStmtWriter; 4657}; 4658 4659/// \brief Represents a C11 generic selection. 4660/// 4661/// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4662/// expression, followed by one or more generic associations. Each generic 4663/// association specifies a type name and an expression, or "default" and an 4664/// expression (in which case it is known as a default generic association). 4665/// The type and value of the generic selection are identical to those of its 4666/// result expression, which is defined as the expression in the generic 4667/// association with a type name that is compatible with the type of the 4668/// controlling expression, or the expression in the default generic association 4669/// if no types are compatible. For example: 4670/// 4671/// @code 4672/// _Generic(X, double: 1, float: 2, default: 3) 4673/// @endcode 4674/// 4675/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4676/// or 3 if "hello". 4677/// 4678/// As an extension, generic selections are allowed in C++, where the following 4679/// additional semantics apply: 4680/// 4681/// Any generic selection whose controlling expression is type-dependent or 4682/// which names a dependent type in its association list is result-dependent, 4683/// which means that the choice of result expression is dependent. 4684/// Result-dependent generic associations are both type- and value-dependent. 4685class GenericSelectionExpr : public Expr { 4686 enum { CONTROLLING, END_EXPR }; 4687 TypeSourceInfo **AssocTypes; 4688 Stmt **SubExprs; 4689 unsigned NumAssocs, ResultIndex; 4690 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4691 4692public: 4693 GenericSelectionExpr(const ASTContext &Context, 4694 SourceLocation GenericLoc, Expr *ControllingExpr, 4695 ArrayRef<TypeSourceInfo*> AssocTypes, 4696 ArrayRef<Expr*> AssocExprs, 4697 SourceLocation DefaultLoc, SourceLocation RParenLoc, 4698 bool ContainsUnexpandedParameterPack, 4699 unsigned ResultIndex); 4700 4701 /// This constructor is used in the result-dependent case. 4702 GenericSelectionExpr(const ASTContext &Context, 4703 SourceLocation GenericLoc, Expr *ControllingExpr, 4704 ArrayRef<TypeSourceInfo*> AssocTypes, 4705 ArrayRef<Expr*> AssocExprs, 4706 SourceLocation DefaultLoc, SourceLocation RParenLoc, 4707 bool ContainsUnexpandedParameterPack); 4708 4709 explicit GenericSelectionExpr(EmptyShell Empty) 4710 : Expr(GenericSelectionExprClass, Empty) { } 4711 4712 unsigned getNumAssocs() const { return NumAssocs; } 4713 4714 SourceLocation getGenericLoc() const { return GenericLoc; } 4715 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4716 SourceLocation getRParenLoc() const { return RParenLoc; } 4717 4718 const Expr *getAssocExpr(unsigned i) const { 4719 return cast<Expr>(SubExprs[END_EXPR+i]); 4720 } 4721 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4722 ArrayRef<Expr *> getAssocExprs() const { 4723 return NumAssocs 4724 ? llvm::makeArrayRef( 4725 &reinterpret_cast<Expr **>(SubExprs)[END_EXPR], NumAssocs) 4726 : None; 4727 } 4728 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4729 return AssocTypes[i]; 4730 } 4731 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4732 ArrayRef<TypeSourceInfo *> getAssocTypeSourceInfos() const { 4733 return NumAssocs ? llvm::makeArrayRef(&AssocTypes[0], NumAssocs) : None; 4734 } 4735 4736 QualType getAssocType(unsigned i) const { 4737 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4738 return TS->getType(); 4739 else 4740 return QualType(); 4741 } 4742 4743 const Expr *getControllingExpr() const { 4744 return cast<Expr>(SubExprs[CONTROLLING]); 4745 } 4746 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4747 4748 /// Whether this generic selection is result-dependent. 4749 bool isResultDependent() const { return ResultIndex == -1U; } 4750 4751 /// The zero-based index of the result expression's generic association in 4752 /// the generic selection's association list. Defined only if the 4753 /// generic selection is not result-dependent. 4754 unsigned getResultIndex() const { 4755 assert(!isResultDependent() && "Generic selection is result-dependent"); 4756 return ResultIndex; 4757 } 4758 4759 /// The generic selection's result expression. Defined only if the 4760 /// generic selection is not result-dependent. 4761 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4762 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4763 4764 SourceLocation getLocStart() const LLVM_READONLY { return GenericLoc; } 4765 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4766 4767 static bool classof(const Stmt *T) { 4768 return T->getStmtClass() == GenericSelectionExprClass; 4769 } 4770 4771 child_range children() { 4772 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4773 } 4774 const_child_range children() const { 4775 return const_child_range(SubExprs, SubExprs + END_EXPR + NumAssocs); 4776 } 4777 friend class ASTStmtReader; 4778}; 4779 4780//===----------------------------------------------------------------------===// 4781// Clang Extensions 4782//===----------------------------------------------------------------------===// 4783 4784/// ExtVectorElementExpr - This represents access to specific elements of a 4785/// vector, and may occur on the left hand side or right hand side. For example 4786/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4787/// 4788/// Note that the base may have either vector or pointer to vector type, just 4789/// like a struct field reference. 4790/// 4791class ExtVectorElementExpr : public Expr { 4792 Stmt *Base; 4793 IdentifierInfo *Accessor; 4794 SourceLocation AccessorLoc; 4795public: 4796 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4797 IdentifierInfo &accessor, SourceLocation loc) 4798 : Expr(ExtVectorElementExprClass, ty, VK, 4799 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4800 base->isTypeDependent(), base->isValueDependent(), 4801 base->isInstantiationDependent(), 4802 base->containsUnexpandedParameterPack()), 4803 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4804 4805 /// \brief Build an empty vector element expression. 4806 explicit ExtVectorElementExpr(EmptyShell Empty) 4807 : Expr(ExtVectorElementExprClass, Empty) { } 4808 4809 const Expr *getBase() const { return cast<Expr>(Base); } 4810 Expr *getBase() { return cast<Expr>(Base); } 4811 void setBase(Expr *E) { Base = E; } 4812 4813 IdentifierInfo &getAccessor() const { return *Accessor; } 4814 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4815 4816 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4817 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4818 4819 /// getNumElements - Get the number of components being selected. 4820 unsigned getNumElements() const; 4821 4822 /// containsDuplicateElements - Return true if any element access is 4823 /// repeated. 4824 bool containsDuplicateElements() const; 4825 4826 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4827 /// aggregate Constant of ConstantInt(s). 4828 void getEncodedElementAccess(SmallVectorImpl<uint32_t> &Elts) const; 4829 4830 SourceLocation getLocStart() const LLVM_READONLY { 4831 return getBase()->getLocStart(); 4832 } 4833 SourceLocation getLocEnd() const LLVM_READONLY { return AccessorLoc; } 4834 4835 /// isArrow - Return true if the base expression is a pointer to vector, 4836 /// return false if the base expression is a vector. 4837 bool isArrow() const; 4838 4839 static bool classof(const Stmt *T) { 4840 return T->getStmtClass() == ExtVectorElementExprClass; 4841 } 4842 4843 // Iterators 4844 child_range children() { return child_range(&Base, &Base+1); } 4845 const_child_range children() const { 4846 return const_child_range(&Base, &Base + 1); 4847 } 4848}; 4849 4850/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4851/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4852class BlockExpr : public Expr { 4853protected: 4854 BlockDecl *TheBlock; 4855public: 4856 BlockExpr(BlockDecl *BD, QualType ty) 4857 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4858 ty->isDependentType(), ty->isDependentType(), 4859 ty->isInstantiationDependentType() || BD->isDependentContext(), 4860 false), 4861 TheBlock(BD) {} 4862 4863 /// \brief Build an empty block expression. 4864 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4865 4866 const BlockDecl *getBlockDecl() const { return TheBlock; } 4867 BlockDecl *getBlockDecl() { return TheBlock; } 4868 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4869 4870 // Convenience functions for probing the underlying BlockDecl. 4871 SourceLocation getCaretLocation() const; 4872 const Stmt *getBody() const; 4873 Stmt *getBody(); 4874 4875 SourceLocation getLocStart() const LLVM_READONLY { return getCaretLocation(); } 4876 SourceLocation getLocEnd() const LLVM_READONLY { return getBody()->getLocEnd(); } 4877 4878 /// getFunctionType - Return the underlying function type for this block. 4879 const FunctionProtoType *getFunctionType() const; 4880 4881 static bool classof(const Stmt *T) { 4882 return T->getStmtClass() == BlockExprClass; 4883 } 4884 4885 // Iterators 4886 child_range children() { 4887 return child_range(child_iterator(), child_iterator()); 4888 } 4889 const_child_range children() const { 4890 return const_child_range(const_child_iterator(), const_child_iterator()); 4891 } 4892}; 4893 4894/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4895/// This AST node provides support for reinterpreting a type to another 4896/// type of the same size. 4897class AsTypeExpr : public Expr { 4898private: 4899 Stmt *SrcExpr; 4900 SourceLocation BuiltinLoc, RParenLoc; 4901 4902 friend class ASTReader; 4903 friend class ASTStmtReader; 4904 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4905 4906public: 4907 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4908 ExprValueKind VK, ExprObjectKind OK, 4909 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4910 : Expr(AsTypeExprClass, DstType, VK, OK, 4911 DstType->isDependentType(), 4912 DstType->isDependentType() || SrcExpr->isValueDependent(), 4913 (DstType->isInstantiationDependentType() || 4914 SrcExpr->isInstantiationDependent()), 4915 (DstType->containsUnexpandedParameterPack() || 4916 SrcExpr->containsUnexpandedParameterPack())), 4917 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4918 4919 /// getSrcExpr - Return the Expr to be converted. 4920 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4921 4922 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4923 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4924 4925 /// getRParenLoc - Return the location of final right parenthesis. 4926 SourceLocation getRParenLoc() const { return RParenLoc; } 4927 4928 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 4929 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 4930 4931 static bool classof(const Stmt *T) { 4932 return T->getStmtClass() == AsTypeExprClass; 4933 } 4934 4935 // Iterators 4936 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4937 const_child_range children() const { 4938 return const_child_range(&SrcExpr, &SrcExpr + 1); 4939 } 4940}; 4941 4942/// PseudoObjectExpr - An expression which accesses a pseudo-object 4943/// l-value. A pseudo-object is an abstract object, accesses to which 4944/// are translated to calls. The pseudo-object expression has a 4945/// syntactic form, which shows how the expression was actually 4946/// written in the source code, and a semantic form, which is a series 4947/// of expressions to be executed in order which detail how the 4948/// operation is actually evaluated. Optionally, one of the semantic 4949/// forms may also provide a result value for the expression. 4950/// 4951/// If any of the semantic-form expressions is an OpaqueValueExpr, 4952/// that OVE is required to have a source expression, and it is bound 4953/// to the result of that source expression. Such OVEs may appear 4954/// only in subsequent semantic-form expressions and as 4955/// sub-expressions of the syntactic form. 4956/// 4957/// PseudoObjectExpr should be used only when an operation can be 4958/// usefully described in terms of fairly simple rewrite rules on 4959/// objects and functions that are meant to be used by end-developers. 4960/// For example, under the Itanium ABI, dynamic casts are implemented 4961/// as a call to a runtime function called __dynamic_cast; using this 4962/// class to describe that would be inappropriate because that call is 4963/// not really part of the user-visible semantics, and instead the 4964/// cast is properly reflected in the AST and IR-generation has been 4965/// taught to generate the call as necessary. In contrast, an 4966/// Objective-C property access is semantically defined to be 4967/// equivalent to a particular message send, and this is very much 4968/// part of the user model. The name of this class encourages this 4969/// modelling design. 4970class PseudoObjectExpr final 4971 : public Expr, 4972 private llvm::TrailingObjects<PseudoObjectExpr, Expr *> { 4973 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4974 // Always at least two, because the first sub-expression is the 4975 // syntactic form. 4976 4977 // PseudoObjectExprBits.ResultIndex - The index of the 4978 // sub-expression holding the result. 0 means the result is void, 4979 // which is unambiguous because it's the index of the syntactic 4980 // form. Note that this is therefore 1 higher than the value passed 4981 // in to Create, which is an index within the semantic forms. 4982 // Note also that ASTStmtWriter assumes this encoding. 4983 4984 Expr **getSubExprsBuffer() { return getTrailingObjects<Expr *>(); } 4985 const Expr * const *getSubExprsBuffer() const { 4986 return getTrailingObjects<Expr *>(); 4987 } 4988 4989 PseudoObjectExpr(QualType type, ExprValueKind VK, 4990 Expr *syntactic, ArrayRef<Expr*> semantic, 4991 unsigned resultIndex); 4992 4993 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4994 4995 unsigned getNumSubExprs() const { 4996 return PseudoObjectExprBits.NumSubExprs; 4997 } 4998 4999public: 5000 /// NoResult - A value for the result index indicating that there is 5001 /// no semantic result. 5002 enum : unsigned { NoResult = ~0U }; 5003 5004 static PseudoObjectExpr *Create(const ASTContext &Context, Expr *syntactic, 5005 ArrayRef<Expr*> semantic, 5006 unsigned resultIndex); 5007 5008 static PseudoObjectExpr *Create(const ASTContext &Context, EmptyShell shell, 5009 unsigned numSemanticExprs); 5010 5011 /// Return the syntactic form of this expression, i.e. the 5012 /// expression it actually looks like. Likely to be expressed in 5013 /// terms of OpaqueValueExprs bound in the semantic form. 5014 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 5015 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 5016 5017 /// Return the index of the result-bearing expression into the semantics 5018 /// expressions, or PseudoObjectExpr::NoResult if there is none. 5019 unsigned getResultExprIndex() const { 5020 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 5021 return PseudoObjectExprBits.ResultIndex - 1; 5022 } 5023 5024 /// Return the result-bearing expression, or null if there is none. 5025 Expr *getResultExpr() { 5026 if (PseudoObjectExprBits.ResultIndex == 0) 5027 return nullptr; 5028 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 5029 } 5030 const Expr *getResultExpr() const { 5031 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 5032 } 5033 5034 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 5035 5036 typedef Expr * const *semantics_iterator; 5037 typedef const Expr * const *const_semantics_iterator; 5038 semantics_iterator semantics_begin() { 5039 return getSubExprsBuffer() + 1; 5040 } 5041 const_semantics_iterator semantics_begin() const { 5042 return getSubExprsBuffer() + 1; 5043 } 5044 semantics_iterator semantics_end() { 5045 return getSubExprsBuffer() + getNumSubExprs(); 5046 } 5047 const_semantics_iterator semantics_end() const { 5048 return getSubExprsBuffer() + getNumSubExprs(); 5049 } 5050 5051 llvm::iterator_range<semantics_iterator> semantics() { 5052 return llvm::make_range(semantics_begin(), semantics_end()); 5053 } 5054 llvm::iterator_range<const_semantics_iterator> semantics() const { 5055 return llvm::make_range(semantics_begin(), semantics_end()); 5056 } 5057 5058 Expr *getSemanticExpr(unsigned index) { 5059 assert(index + 1 < getNumSubExprs()); 5060 return getSubExprsBuffer()[index + 1]; 5061 } 5062 const Expr *getSemanticExpr(unsigned index) const { 5063 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 5064 } 5065 5066 SourceLocation getExprLoc() const LLVM_READONLY { 5067 return getSyntacticForm()->getExprLoc(); 5068 } 5069 5070 SourceLocation getLocStart() const LLVM_READONLY { 5071 return getSyntacticForm()->getLocStart(); 5072 } 5073 SourceLocation getLocEnd() const LLVM_READONLY { 5074 return getSyntacticForm()->getLocEnd(); 5075 } 5076 5077 child_range children() { 5078 const_child_range CCR = 5079 const_cast<const PseudoObjectExpr *>(this)->children(); 5080 return child_range(cast_away_const(CCR.begin()), 5081 cast_away_const(CCR.end())); 5082 } 5083 const_child_range children() const { 5084 Stmt *const *cs = const_cast<Stmt *const *>( 5085 reinterpret_cast<const Stmt *const *>(getSubExprsBuffer())); 5086 return const_child_range(cs, cs + getNumSubExprs()); 5087 } 5088 5089 static bool classof(const Stmt *T) { 5090 return T->getStmtClass() == PseudoObjectExprClass; 5091 } 5092 5093 friend TrailingObjects; 5094 friend class ASTStmtReader; 5095}; 5096 5097/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 5098/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 5099/// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>, 5100/// and corresponding __opencl_atomic_* for OpenCL 2.0. 5101/// All of these instructions take one primary pointer, at least one memory 5102/// order. The instructions for which getScopeModel returns non-null value 5103/// take one synch scope. 5104class AtomicExpr : public Expr { 5105public: 5106 enum AtomicOp { 5107#define BUILTIN(ID, TYPE, ATTRS) 5108#define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID, 5109#include "clang/Basic/Builtins.def" 5110 // Avoid trailing comma 5111 BI_First = 0 5112 }; 5113 5114private: 5115 /// \brief Location of sub-expressions. 5116 /// The location of Scope sub-expression is NumSubExprs - 1, which is 5117 /// not fixed, therefore is not defined in enum. 5118 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR }; 5119 Stmt *SubExprs[END_EXPR + 1]; 5120 unsigned NumSubExprs; 5121 SourceLocation BuiltinLoc, RParenLoc; 5122 AtomicOp Op; 5123 5124 friend class ASTStmtReader; 5125public: 5126 AtomicExpr(SourceLocation BLoc, ArrayRef<Expr*> args, QualType t, 5127 AtomicOp op, SourceLocation RP); 5128 5129 /// \brief Determine the number of arguments the specified atomic builtin 5130 /// should have. 5131 static unsigned getNumSubExprs(AtomicOp Op); 5132 5133 /// \brief Build an empty AtomicExpr. 5134 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 5135 5136 Expr *getPtr() const { 5137 return cast<Expr>(SubExprs[PTR]); 5138 } 5139 Expr *getOrder() const { 5140 return cast<Expr>(SubExprs[ORDER]); 5141 } 5142 Expr *getScope() const { 5143 assert(getScopeModel() && "No scope"); 5144 return cast<Expr>(SubExprs[NumSubExprs - 1]); 5145 } 5146 Expr *getVal1() const { 5147 if (Op == AO__c11_atomic_init || Op == AO__opencl_atomic_init) 5148 return cast<Expr>(SubExprs[ORDER]); 5149 assert(NumSubExprs > VAL1); 5150 return cast<Expr>(SubExprs[VAL1]); 5151 } 5152 Expr *getOrderFail() const { 5153 assert(NumSubExprs > ORDER_FAIL); 5154 return cast<Expr>(SubExprs[ORDER_FAIL]); 5155 } 5156 Expr *getVal2() const { 5157 if (Op == AO__atomic_exchange) 5158 return cast<Expr>(SubExprs[ORDER_FAIL]); 5159 assert(NumSubExprs > VAL2); 5160 return cast<Expr>(SubExprs[VAL2]); 5161 } 5162 Expr *getWeak() const { 5163 assert(NumSubExprs > WEAK); 5164 return cast<Expr>(SubExprs[WEAK]); 5165 } 5166 QualType getValueType() const; 5167 5168 AtomicOp getOp() const { return Op; } 5169 unsigned getNumSubExprs() const { return NumSubExprs; } 5170 5171 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 5172 const Expr * const *getSubExprs() const { 5173 return reinterpret_cast<Expr * const *>(SubExprs); 5174 } 5175 5176 bool isVolatile() const { 5177 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 5178 } 5179 5180 bool isCmpXChg() const { 5181 return getOp() == AO__c11_atomic_compare_exchange_strong || 5182 getOp() == AO__c11_atomic_compare_exchange_weak || 5183 getOp() == AO__opencl_atomic_compare_exchange_strong || 5184 getOp() == AO__opencl_atomic_compare_exchange_weak || 5185 getOp() == AO__atomic_compare_exchange || 5186 getOp() == AO__atomic_compare_exchange_n; 5187 } 5188 5189 bool isOpenCL() const { 5190 return getOp() >= AO__opencl_atomic_init && 5191 getOp() <= AO__opencl_atomic_fetch_max; 5192 } 5193 5194 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 5195 SourceLocation getRParenLoc() const { return RParenLoc; } 5196 5197 SourceLocation getLocStart() const LLVM_READONLY { return BuiltinLoc; } 5198 SourceLocation getLocEnd() const LLVM_READONLY { return RParenLoc; } 5199 5200 static bool classof(const Stmt *T) { 5201 return T->getStmtClass() == AtomicExprClass; 5202 } 5203 5204 // Iterators 5205 child_range children() { 5206 return child_range(SubExprs, SubExprs+NumSubExprs); 5207 } 5208 const_child_range children() const { 5209 return const_child_range(SubExprs, SubExprs + NumSubExprs); 5210 } 5211 5212 /// \brief Get atomic scope model for the atomic op code. 5213 /// \return empty atomic scope model if the atomic op code does not have 5214 /// scope operand. 5215 static std::unique_ptr<AtomicScopeModel> getScopeModel(AtomicOp Op) { 5216 auto Kind = 5217 (Op >= AO__opencl_atomic_load && Op <= AO__opencl_atomic_fetch_max) 5218 ? AtomicScopeModelKind::OpenCL 5219 : AtomicScopeModelKind::None; 5220 return AtomicScopeModel::create(Kind); 5221 } 5222 5223 /// \brief Get atomic scope model. 5224 /// \return empty atomic scope model if this atomic expression does not have 5225 /// scope operand. 5226 std::unique_ptr<AtomicScopeModel> getScopeModel() const { 5227 return getScopeModel(getOp()); 5228 } 5229}; 5230 5231/// TypoExpr - Internal placeholder for expressions where typo correction 5232/// still needs to be performed and/or an error diagnostic emitted. 5233class TypoExpr : public Expr { 5234public: 5235 TypoExpr(QualType T) 5236 : Expr(TypoExprClass, T, VK_LValue, OK_Ordinary, 5237 /*isTypeDependent*/ true, 5238 /*isValueDependent*/ true, 5239 /*isInstantiationDependent*/ true, 5240 /*containsUnexpandedParameterPack*/ false) { 5241 assert(T->isDependentType() && "TypoExpr given a non-dependent type"); 5242 } 5243 5244 child_range children() { 5245 return child_range(child_iterator(), child_iterator()); 5246 } 5247 const_child_range children() const { 5248 return const_child_range(const_child_iterator(), const_child_iterator()); 5249 } 5250 5251 SourceLocation getLocStart() const LLVM_READONLY { return SourceLocation(); } 5252 SourceLocation getLocEnd() const LLVM_READONLY { return SourceLocation(); } 5253 5254 static bool classof(const Stmt *T) { 5255 return T->getStmtClass() == TypoExprClass; 5256 } 5257 5258}; 5259} // end namespace clang 5260 5261#endif // LLVM_CLANG_AST_EXPR_H 5262