Expr.h revision 9852f58f50b4fc20914fbce5b4454135a42343f4
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/Decl.h" 19#include "clang/AST/Stmt.h" 20#include "clang/AST/Type.h" 21#include "clang/AST/DeclAccessPair.h" 22#include "clang/AST/OperationKinds.h" 23#include "clang/AST/ASTVector.h" 24#include "clang/AST/TemplateBase.h" 25#include "clang/Basic/TypeTraits.h" 26#include "llvm/ADT/APSInt.h" 27#include "llvm/ADT/APFloat.h" 28#include "llvm/ADT/SmallVector.h" 29#include "llvm/ADT/StringRef.h" 30#include "llvm/Support/Compiler.h" 31#include <cctype> 32 33namespace clang { 34 class APValue; 35 class ASTContext; 36 class BlockDecl; 37 class CXXBaseSpecifier; 38 class CXXMemberCallExpr; 39 class CXXOperatorCallExpr; 40 class CastExpr; 41 class Decl; 42 class IdentifierInfo; 43 class MaterializeTemporaryExpr; 44 class NamedDecl; 45 class ObjCPropertyRefExpr; 46 class OpaqueValueExpr; 47 class ParmVarDecl; 48 class TargetInfo; 49 class ValueDecl; 50 51/// \brief A simple array of base specifiers. 52typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 53 54/// \brief An adjustment to be made to the temporary created when emitting a 55/// reference binding, which accesses a particular subobject of that temporary. 56struct SubobjectAdjustment { 57 enum { 58 DerivedToBaseAdjustment, 59 FieldAdjustment, 60 MemberPointerAdjustment 61 } Kind; 62 63 union { 64 struct { 65 const CastExpr *BasePath; 66 const CXXRecordDecl *DerivedClass; 67 } DerivedToBase; 68 69 FieldDecl *Field; 70 71 struct { 72 const MemberPointerType *MPT; 73 Expr *RHS; 74 } Ptr; 75 }; 76 77 SubobjectAdjustment(const CastExpr *BasePath, 78 const CXXRecordDecl *DerivedClass) 79 : Kind(DerivedToBaseAdjustment) { 80 DerivedToBase.BasePath = BasePath; 81 DerivedToBase.DerivedClass = DerivedClass; 82 } 83 84 SubobjectAdjustment(FieldDecl *Field) 85 : Kind(FieldAdjustment) { 86 this->Field = Field; 87 } 88 89 SubobjectAdjustment(const MemberPointerType *MPT, Expr *RHS) 90 : Kind(MemberPointerAdjustment) { 91 this->Ptr.MPT = MPT; 92 this->Ptr.RHS = RHS; 93 } 94}; 95 96/// Expr - This represents one expression. Note that Expr's are subclasses of 97/// Stmt. This allows an expression to be transparently used any place a Stmt 98/// is required. 99/// 100class Expr : public Stmt { 101 QualType TR; 102 103protected: 104 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 105 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 106 : Stmt(SC) 107 { 108 ExprBits.TypeDependent = TD; 109 ExprBits.ValueDependent = VD; 110 ExprBits.InstantiationDependent = ID; 111 ExprBits.ValueKind = VK; 112 ExprBits.ObjectKind = OK; 113 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 114 setType(T); 115 } 116 117 /// \brief Construct an empty expression. 118 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 119 120public: 121 QualType getType() const { return TR; } 122 void setType(QualType t) { 123 // In C++, the type of an expression is always adjusted so that it 124 // will not have reference type an expression will never have 125 // reference type (C++ [expr]p6). Use 126 // QualType::getNonReferenceType() to retrieve the non-reference 127 // type. Additionally, inspect Expr::isLvalue to determine whether 128 // an expression that is adjusted in this manner should be 129 // considered an lvalue. 130 assert((t.isNull() || !t->isReferenceType()) && 131 "Expressions can't have reference type"); 132 133 TR = t; 134 } 135 136 /// isValueDependent - Determines whether this expression is 137 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 138 /// array bound of "Chars" in the following example is 139 /// value-dependent. 140 /// @code 141 /// template<int Size, char (&Chars)[Size]> struct meta_string; 142 /// @endcode 143 bool isValueDependent() const { return ExprBits.ValueDependent; } 144 145 /// \brief Set whether this expression is value-dependent or not. 146 void setValueDependent(bool VD) { 147 ExprBits.ValueDependent = VD; 148 if (VD) 149 ExprBits.InstantiationDependent = true; 150 } 151 152 /// isTypeDependent - Determines whether this expression is 153 /// type-dependent (C++ [temp.dep.expr]), which means that its type 154 /// could change from one template instantiation to the next. For 155 /// example, the expressions "x" and "x + y" are type-dependent in 156 /// the following code, but "y" is not type-dependent: 157 /// @code 158 /// template<typename T> 159 /// void add(T x, int y) { 160 /// x + y; 161 /// } 162 /// @endcode 163 bool isTypeDependent() const { return ExprBits.TypeDependent; } 164 165 /// \brief Set whether this expression is type-dependent or not. 166 void setTypeDependent(bool TD) { 167 ExprBits.TypeDependent = TD; 168 if (TD) 169 ExprBits.InstantiationDependent = true; 170 } 171 172 /// \brief Whether this expression is instantiation-dependent, meaning that 173 /// it depends in some way on a template parameter, even if neither its type 174 /// nor (constant) value can change due to the template instantiation. 175 /// 176 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 177 /// instantiation-dependent (since it involves a template parameter \c T), but 178 /// is neither type- nor value-dependent, since the type of the inner 179 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 180 /// \c sizeof is known. 181 /// 182 /// \code 183 /// template<typename T> 184 /// void f(T x, T y) { 185 /// sizeof(sizeof(T() + T()); 186 /// } 187 /// \endcode 188 /// 189 bool isInstantiationDependent() const { 190 return ExprBits.InstantiationDependent; 191 } 192 193 /// \brief Set whether this expression is instantiation-dependent or not. 194 void setInstantiationDependent(bool ID) { 195 ExprBits.InstantiationDependent = ID; 196 } 197 198 /// \brief Whether this expression contains an unexpanded parameter 199 /// pack (for C++0x variadic templates). 200 /// 201 /// Given the following function template: 202 /// 203 /// \code 204 /// template<typename F, typename ...Types> 205 /// void forward(const F &f, Types &&...args) { 206 /// f(static_cast<Types&&>(args)...); 207 /// } 208 /// \endcode 209 /// 210 /// The expressions \c args and \c static_cast<Types&&>(args) both 211 /// contain parameter packs. 212 bool containsUnexpandedParameterPack() const { 213 return ExprBits.ContainsUnexpandedParameterPack; 214 } 215 216 /// \brief Set the bit that describes whether this expression 217 /// contains an unexpanded parameter pack. 218 void setContainsUnexpandedParameterPack(bool PP = true) { 219 ExprBits.ContainsUnexpandedParameterPack = PP; 220 } 221 222 /// getExprLoc - Return the preferred location for the arrow when diagnosing 223 /// a problem with a generic expression. 224 SourceLocation getExprLoc() const LLVM_READONLY; 225 226 /// isUnusedResultAWarning - Return true if this immediate expression should 227 /// be warned about if the result is unused. If so, fill in expr, location, 228 /// and ranges with expr to warn on and source locations/ranges appropriate 229 /// for a warning. 230 bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc, 231 SourceRange &R1, SourceRange &R2, 232 ASTContext &Ctx) const; 233 234 /// isLValue - True if this expression is an "l-value" according to 235 /// the rules of the current language. C and C++ give somewhat 236 /// different rules for this concept, but in general, the result of 237 /// an l-value expression identifies a specific object whereas the 238 /// result of an r-value expression is a value detached from any 239 /// specific storage. 240 /// 241 /// C++0x divides the concept of "r-value" into pure r-values 242 /// ("pr-values") and so-called expiring values ("x-values"), which 243 /// identify specific objects that can be safely cannibalized for 244 /// their resources. This is an unfortunate abuse of terminology on 245 /// the part of the C++ committee. In Clang, when we say "r-value", 246 /// we generally mean a pr-value. 247 bool isLValue() const { return getValueKind() == VK_LValue; } 248 bool isRValue() const { return getValueKind() == VK_RValue; } 249 bool isXValue() const { return getValueKind() == VK_XValue; } 250 bool isGLValue() const { return getValueKind() != VK_RValue; } 251 252 enum LValueClassification { 253 LV_Valid, 254 LV_NotObjectType, 255 LV_IncompleteVoidType, 256 LV_DuplicateVectorComponents, 257 LV_InvalidExpression, 258 LV_InvalidMessageExpression, 259 LV_MemberFunction, 260 LV_SubObjCPropertySetting, 261 LV_ClassTemporary, 262 LV_ArrayTemporary 263 }; 264 /// Reasons why an expression might not be an l-value. 265 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 266 267 enum isModifiableLvalueResult { 268 MLV_Valid, 269 MLV_NotObjectType, 270 MLV_IncompleteVoidType, 271 MLV_DuplicateVectorComponents, 272 MLV_InvalidExpression, 273 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 274 MLV_IncompleteType, 275 MLV_ConstQualified, 276 MLV_ArrayType, 277 MLV_ReadonlyProperty, 278 MLV_NoSetterProperty, 279 MLV_MemberFunction, 280 MLV_SubObjCPropertySetting, 281 MLV_InvalidMessageExpression, 282 MLV_ClassTemporary, 283 MLV_ArrayTemporary 284 }; 285 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 286 /// does not have an incomplete type, does not have a const-qualified type, 287 /// and if it is a structure or union, does not have any member (including, 288 /// recursively, any member or element of all contained aggregates or unions) 289 /// with a const-qualified type. 290 /// 291 /// \param Loc [in,out] - A source location which *may* be filled 292 /// in with the location of the expression making this a 293 /// non-modifiable lvalue, if specified. 294 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 295 SourceLocation *Loc = 0) const; 296 297 /// \brief The return type of classify(). Represents the C++0x expression 298 /// taxonomy. 299 class Classification { 300 public: 301 /// \brief The various classification results. Most of these mean prvalue. 302 enum Kinds { 303 CL_LValue, 304 CL_XValue, 305 CL_Function, // Functions cannot be lvalues in C. 306 CL_Void, // Void cannot be an lvalue in C. 307 CL_AddressableVoid, // Void expression whose address can be taken in C. 308 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 309 CL_MemberFunction, // An expression referring to a member function 310 CL_SubObjCPropertySetting, 311 CL_ClassTemporary, // A temporary of class type, or subobject thereof. 312 CL_ArrayTemporary, // A temporary of array type. 313 CL_ObjCMessageRValue, // ObjC message is an rvalue 314 CL_PRValue // A prvalue for any other reason, of any other type 315 }; 316 /// \brief The results of modification testing. 317 enum ModifiableType { 318 CM_Untested, // testModifiable was false. 319 CM_Modifiable, 320 CM_RValue, // Not modifiable because it's an rvalue 321 CM_Function, // Not modifiable because it's a function; C++ only 322 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 323 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 324 CM_ConstQualified, 325 CM_ArrayType, 326 CM_IncompleteType 327 }; 328 329 private: 330 friend class Expr; 331 332 unsigned short Kind; 333 unsigned short Modifiable; 334 335 explicit Classification(Kinds k, ModifiableType m) 336 : Kind(k), Modifiable(m) 337 {} 338 339 public: 340 Classification() {} 341 342 Kinds getKind() const { return static_cast<Kinds>(Kind); } 343 ModifiableType getModifiable() const { 344 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 345 return static_cast<ModifiableType>(Modifiable); 346 } 347 bool isLValue() const { return Kind == CL_LValue; } 348 bool isXValue() const { return Kind == CL_XValue; } 349 bool isGLValue() const { return Kind <= CL_XValue; } 350 bool isPRValue() const { return Kind >= CL_Function; } 351 bool isRValue() const { return Kind >= CL_XValue; } 352 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 353 354 /// \brief Create a simple, modifiably lvalue 355 static Classification makeSimpleLValue() { 356 return Classification(CL_LValue, CM_Modifiable); 357 } 358 359 }; 360 /// \brief Classify - Classify this expression according to the C++0x 361 /// expression taxonomy. 362 /// 363 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 364 /// old lvalue vs rvalue. This function determines the type of expression this 365 /// is. There are three expression types: 366 /// - lvalues are classical lvalues as in C++03. 367 /// - prvalues are equivalent to rvalues in C++03. 368 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 369 /// function returning an rvalue reference. 370 /// lvalues and xvalues are collectively referred to as glvalues, while 371 /// prvalues and xvalues together form rvalues. 372 Classification Classify(ASTContext &Ctx) const { 373 return ClassifyImpl(Ctx, 0); 374 } 375 376 /// \brief ClassifyModifiable - Classify this expression according to the 377 /// C++0x expression taxonomy, and see if it is valid on the left side 378 /// of an assignment. 379 /// 380 /// This function extends classify in that it also tests whether the 381 /// expression is modifiable (C99 6.3.2.1p1). 382 /// \param Loc A source location that might be filled with a relevant location 383 /// if the expression is not modifiable. 384 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 385 return ClassifyImpl(Ctx, &Loc); 386 } 387 388 /// getValueKindForType - Given a formal return or parameter type, 389 /// give its value kind. 390 static ExprValueKind getValueKindForType(QualType T) { 391 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 392 return (isa<LValueReferenceType>(RT) 393 ? VK_LValue 394 : (RT->getPointeeType()->isFunctionType() 395 ? VK_LValue : VK_XValue)); 396 return VK_RValue; 397 } 398 399 /// getValueKind - The value kind that this expression produces. 400 ExprValueKind getValueKind() const { 401 return static_cast<ExprValueKind>(ExprBits.ValueKind); 402 } 403 404 /// getObjectKind - The object kind that this expression produces. 405 /// Object kinds are meaningful only for expressions that yield an 406 /// l-value or x-value. 407 ExprObjectKind getObjectKind() const { 408 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 409 } 410 411 bool isOrdinaryOrBitFieldObject() const { 412 ExprObjectKind OK = getObjectKind(); 413 return (OK == OK_Ordinary || OK == OK_BitField); 414 } 415 416 /// setValueKind - Set the value kind produced by this expression. 417 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 418 419 /// setObjectKind - Set the object kind produced by this expression. 420 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 421 422private: 423 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 424 425public: 426 427 /// \brief If this expression refers to a bit-field, retrieve the 428 /// declaration of that bit-field. 429 FieldDecl *getBitField(); 430 431 const FieldDecl *getBitField() const { 432 return const_cast<Expr*>(this)->getBitField(); 433 } 434 435 /// \brief If this expression is an l-value for an Objective C 436 /// property, find the underlying property reference expression. 437 const ObjCPropertyRefExpr *getObjCProperty() const; 438 439 /// \brief Check if this expression is the ObjC 'self' implicit parameter. 440 bool isObjCSelfExpr() const; 441 442 /// \brief Returns whether this expression refers to a vector element. 443 bool refersToVectorElement() const; 444 445 /// \brief Returns whether this expression has a placeholder type. 446 bool hasPlaceholderType() const { 447 return getType()->isPlaceholderType(); 448 } 449 450 /// \brief Returns whether this expression has a specific placeholder type. 451 bool hasPlaceholderType(BuiltinType::Kind K) const { 452 assert(BuiltinType::isPlaceholderTypeKind(K)); 453 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 454 return BT->getKind() == K; 455 return false; 456 } 457 458 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 459 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 460 /// but also int expressions which are produced by things like comparisons in 461 /// C. 462 bool isKnownToHaveBooleanValue() const; 463 464 /// isIntegerConstantExpr - Return true if this expression is a valid integer 465 /// constant expression, and, if so, return its value in Result. If not a 466 /// valid i-c-e, return false and fill in Loc (if specified) with the location 467 /// of the invalid expression. 468 /// 469 /// Note: This does not perform the implicit conversions required by C++11 470 /// [expr.const]p5. 471 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 472 SourceLocation *Loc = 0, 473 bool isEvaluated = true) const; 474 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const; 475 476 /// isCXX98IntegralConstantExpr - Return true if this expression is an 477 /// integral constant expression in C++98. Can only be used in C++. 478 bool isCXX98IntegralConstantExpr(ASTContext &Ctx) const; 479 480 /// isCXX11ConstantExpr - Return true if this expression is a constant 481 /// expression in C++11. Can only be used in C++. 482 /// 483 /// Note: This does not perform the implicit conversions required by C++11 484 /// [expr.const]p5. 485 bool isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result = 0, 486 SourceLocation *Loc = 0) const; 487 488 /// isPotentialConstantExpr - Return true if this function's definition 489 /// might be usable in a constant expression in C++11, if it were marked 490 /// constexpr. Return false if the function can never produce a constant 491 /// expression, along with diagnostics describing why not. 492 static bool isPotentialConstantExpr(const FunctionDecl *FD, 493 llvm::SmallVectorImpl< 494 PartialDiagnosticAt> &Diags); 495 496 /// isConstantInitializer - Returns true if this expression can be emitted to 497 /// IR as a constant, and thus can be used as a constant initializer in C. 498 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 499 500 /// EvalStatus is a struct with detailed info about an evaluation in progress. 501 struct EvalStatus { 502 /// HasSideEffects - Whether the evaluated expression has side effects. 503 /// For example, (f() && 0) can be folded, but it still has side effects. 504 bool HasSideEffects; 505 506 /// Diag - If this is non-null, it will be filled in with a stack of notes 507 /// indicating why evaluation failed (or why it failed to produce a constant 508 /// expression). 509 /// If the expression is unfoldable, the notes will indicate why it's not 510 /// foldable. If the expression is foldable, but not a constant expression, 511 /// the notes will describes why it isn't a constant expression. If the 512 /// expression *is* a constant expression, no notes will be produced. 513 llvm::SmallVectorImpl<PartialDiagnosticAt> *Diag; 514 515 EvalStatus() : HasSideEffects(false), Diag(0) {} 516 517 // hasSideEffects - Return true if the evaluated expression has 518 // side effects. 519 bool hasSideEffects() const { 520 return HasSideEffects; 521 } 522 }; 523 524 /// EvalResult is a struct with detailed info about an evaluated expression. 525 struct EvalResult : EvalStatus { 526 /// Val - This is the value the expression can be folded to. 527 APValue Val; 528 529 // isGlobalLValue - Return true if the evaluated lvalue expression 530 // is global. 531 bool isGlobalLValue() const; 532 }; 533 534 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 535 /// an rvalue using any crazy technique (that has nothing to do with language 536 /// standards) that we want to, even if the expression has side-effects. If 537 /// this function returns true, it returns the folded constant in Result. If 538 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 539 /// applied. 540 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 541 542 /// EvaluateAsBooleanCondition - Return true if this is a constant 543 /// which we we can fold and convert to a boolean condition using 544 /// any crazy technique that we want to, even if the expression has 545 /// side-effects. 546 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 547 548 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects }; 549 550 /// EvaluateAsInt - Return true if this is a constant which we can fold and 551 /// convert to an integer, using any crazy technique that we want to. 552 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 553 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 554 555 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 556 /// constant folded without side-effects, but discard the result. 557 bool isEvaluatable(const ASTContext &Ctx) const; 558 559 /// HasSideEffects - This routine returns true for all those expressions 560 /// which have any effect other than producing a value. Example is a function 561 /// call, volatile variable read, or throwing an exception. 562 bool HasSideEffects(const ASTContext &Ctx) const; 563 564 /// \brief Determine whether this expression involves a call to any function 565 /// that is not trivial. 566 bool hasNonTrivialCall(ASTContext &Ctx); 567 568 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 569 /// integer. This must be called on an expression that constant folds to an 570 /// integer. 571 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 572 573 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 574 /// lvalue with link time known address, with no side-effects. 575 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 576 577 /// EvaluateAsInitializer - Evaluate an expression as if it were the 578 /// initializer of the given declaration. Returns true if the initializer 579 /// can be folded to a constant, and produces any relevant notes. In C++11, 580 /// notes will be produced if the expression is not a constant expression. 581 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 582 const VarDecl *VD, 583 llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 584 585 /// \brief Enumeration used to describe the kind of Null pointer constant 586 /// returned from \c isNullPointerConstant(). 587 enum NullPointerConstantKind { 588 /// \brief Expression is not a Null pointer constant. 589 NPCK_NotNull = 0, 590 591 /// \brief Expression is a Null pointer constant built from a zero integer 592 /// expression that is not a simple, possibly parenthesized, zero literal. 593 /// C++ Core Issue 903 will classify these expressions as "not pointers" 594 /// once it is adopted. 595 /// http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#903 596 NPCK_ZeroExpression, 597 598 /// \brief Expression is a Null pointer constant built from a literal zero. 599 NPCK_ZeroLiteral, 600 601 /// \brief Expression is a C++0X nullptr. 602 NPCK_CXX0X_nullptr, 603 604 /// \brief Expression is a GNU-style __null constant. 605 NPCK_GNUNull 606 }; 607 608 /// \brief Enumeration used to describe how \c isNullPointerConstant() 609 /// should cope with value-dependent expressions. 610 enum NullPointerConstantValueDependence { 611 /// \brief Specifies that the expression should never be value-dependent. 612 NPC_NeverValueDependent = 0, 613 614 /// \brief Specifies that a value-dependent expression of integral or 615 /// dependent type should be considered a null pointer constant. 616 NPC_ValueDependentIsNull, 617 618 /// \brief Specifies that a value-dependent expression should be considered 619 /// to never be a null pointer constant. 620 NPC_ValueDependentIsNotNull 621 }; 622 623 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 624 /// a Null pointer constant. The return value can further distinguish the 625 /// kind of NULL pointer constant that was detected. 626 NullPointerConstantKind isNullPointerConstant( 627 ASTContext &Ctx, 628 NullPointerConstantValueDependence NPC) const; 629 630 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 631 /// write barrier. 632 bool isOBJCGCCandidate(ASTContext &Ctx) const; 633 634 /// \brief Returns true if this expression is a bound member function. 635 bool isBoundMemberFunction(ASTContext &Ctx) const; 636 637 /// \brief Given an expression of bound-member type, find the type 638 /// of the member. Returns null if this is an *overloaded* bound 639 /// member expression. 640 static QualType findBoundMemberType(const Expr *expr); 641 642 /// IgnoreImpCasts - Skip past any implicit casts which might 643 /// surround this expression. Only skips ImplicitCastExprs. 644 Expr *IgnoreImpCasts() LLVM_READONLY; 645 646 /// IgnoreImplicit - Skip past any implicit AST nodes which might 647 /// surround this expression. 648 Expr *IgnoreImplicit() LLVM_READONLY { 649 return cast<Expr>(Stmt::IgnoreImplicit()); 650 } 651 652 const Expr *IgnoreImplicit() const LLVM_READONLY { 653 return const_cast<Expr*>(this)->IgnoreImplicit(); 654 } 655 656 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 657 /// its subexpression. If that subexpression is also a ParenExpr, 658 /// then this method recursively returns its subexpression, and so forth. 659 /// Otherwise, the method returns the current Expr. 660 Expr *IgnoreParens() LLVM_READONLY; 661 662 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 663 /// or CastExprs, returning their operand. 664 Expr *IgnoreParenCasts() LLVM_READONLY; 665 666 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 667 /// any ParenExpr or ImplicitCastExprs, returning their operand. 668 Expr *IgnoreParenImpCasts() LLVM_READONLY; 669 670 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 671 /// call to a conversion operator, return the argument. 672 Expr *IgnoreConversionOperator() LLVM_READONLY; 673 674 const Expr *IgnoreConversionOperator() const LLVM_READONLY { 675 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 676 } 677 678 const Expr *IgnoreParenImpCasts() const LLVM_READONLY { 679 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 680 } 681 682 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 683 /// CastExprs that represent lvalue casts, returning their operand. 684 Expr *IgnoreParenLValueCasts() LLVM_READONLY; 685 686 const Expr *IgnoreParenLValueCasts() const LLVM_READONLY { 687 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 688 } 689 690 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 691 /// value (including ptr->int casts of the same size). Strip off any 692 /// ParenExpr or CastExprs, returning their operand. 693 Expr *IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY; 694 695 /// Ignore parentheses and derived-to-base casts. 696 Expr *ignoreParenBaseCasts() LLVM_READONLY; 697 698 const Expr *ignoreParenBaseCasts() const LLVM_READONLY { 699 return const_cast<Expr*>(this)->ignoreParenBaseCasts(); 700 } 701 702 /// \brief Determine whether this expression is a default function argument. 703 /// 704 /// Default arguments are implicitly generated in the abstract syntax tree 705 /// by semantic analysis for function calls, object constructions, etc. in 706 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 707 /// this routine also looks through any implicit casts to determine whether 708 /// the expression is a default argument. 709 bool isDefaultArgument() const; 710 711 /// \brief Determine whether the result of this expression is a 712 /// temporary object of the given class type. 713 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 714 715 /// \brief Whether this expression is an implicit reference to 'this' in C++. 716 bool isImplicitCXXThis() const; 717 718 const Expr *IgnoreImpCasts() const LLVM_READONLY { 719 return const_cast<Expr*>(this)->IgnoreImpCasts(); 720 } 721 const Expr *IgnoreParens() const LLVM_READONLY { 722 return const_cast<Expr*>(this)->IgnoreParens(); 723 } 724 const Expr *IgnoreParenCasts() const LLVM_READONLY { 725 return const_cast<Expr*>(this)->IgnoreParenCasts(); 726 } 727 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const LLVM_READONLY { 728 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 729 } 730 731 static bool hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs); 732 733 /// \brief For an expression of class type or pointer to class type, 734 /// return the most derived class decl the expression is known to refer to. 735 /// 736 /// If this expression is a cast, this method looks through it to find the 737 /// most derived decl that can be inferred from the expression. 738 /// This is valid because derived-to-base conversions have undefined 739 /// behavior if the object isn't dynamically of the derived type. 740 const CXXRecordDecl *getBestDynamicClassType() const; 741 742 /// Walk outwards from an expression we want to bind a reference to and 743 /// find the expression whose lifetime needs to be extended. Record 744 /// the adjustments needed along the path. 745 const Expr * 746 skipRValueSubobjectAdjustments( 747 SmallVectorImpl<SubobjectAdjustment> &Adjustments) const; 748 749 /// Skip irrelevant expressions to find what should be materialize for 750 /// binding with a reference. 751 const Expr * 752 findMaterializedTemporary(const MaterializeTemporaryExpr *&MTE) const; 753 754 static bool classof(const Stmt *T) { 755 return T->getStmtClass() >= firstExprConstant && 756 T->getStmtClass() <= lastExprConstant; 757 } 758}; 759 760 761//===----------------------------------------------------------------------===// 762// Primary Expressions. 763//===----------------------------------------------------------------------===// 764 765/// OpaqueValueExpr - An expression referring to an opaque object of a 766/// fixed type and value class. These don't correspond to concrete 767/// syntax; instead they're used to express operations (usually copy 768/// operations) on values whose source is generally obvious from 769/// context. 770class OpaqueValueExpr : public Expr { 771 friend class ASTStmtReader; 772 Expr *SourceExpr; 773 SourceLocation Loc; 774 775public: 776 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 777 ExprObjectKind OK = OK_Ordinary, 778 Expr *SourceExpr = 0) 779 : Expr(OpaqueValueExprClass, T, VK, OK, 780 T->isDependentType(), 781 T->isDependentType() || 782 (SourceExpr && SourceExpr->isValueDependent()), 783 T->isInstantiationDependentType(), 784 false), 785 SourceExpr(SourceExpr), Loc(Loc) { 786 } 787 788 /// Given an expression which invokes a copy constructor --- i.e. a 789 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 790 /// find the OpaqueValueExpr that's the source of the construction. 791 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 792 793 explicit OpaqueValueExpr(EmptyShell Empty) 794 : Expr(OpaqueValueExprClass, Empty) { } 795 796 /// \brief Retrieve the location of this expression. 797 SourceLocation getLocation() const { return Loc; } 798 799 SourceRange getSourceRange() const LLVM_READONLY { 800 if (SourceExpr) return SourceExpr->getSourceRange(); 801 return Loc; 802 } 803 SourceLocation getExprLoc() const LLVM_READONLY { 804 if (SourceExpr) return SourceExpr->getExprLoc(); 805 return Loc; 806 } 807 808 child_range children() { return child_range(); } 809 810 /// The source expression of an opaque value expression is the 811 /// expression which originally generated the value. This is 812 /// provided as a convenience for analyses that don't wish to 813 /// precisely model the execution behavior of the program. 814 /// 815 /// The source expression is typically set when building the 816 /// expression which binds the opaque value expression in the first 817 /// place. 818 Expr *getSourceExpr() const { return SourceExpr; } 819 820 static bool classof(const Stmt *T) { 821 return T->getStmtClass() == OpaqueValueExprClass; 822 } 823}; 824 825/// \brief A reference to a declared variable, function, enum, etc. 826/// [C99 6.5.1p2] 827/// 828/// This encodes all the information about how a declaration is referenced 829/// within an expression. 830/// 831/// There are several optional constructs attached to DeclRefExprs only when 832/// they apply in order to conserve memory. These are laid out past the end of 833/// the object, and flags in the DeclRefExprBitfield track whether they exist: 834/// 835/// DeclRefExprBits.HasQualifier: 836/// Specifies when this declaration reference expression has a C++ 837/// nested-name-specifier. 838/// DeclRefExprBits.HasFoundDecl: 839/// Specifies when this declaration reference expression has a record of 840/// a NamedDecl (different from the referenced ValueDecl) which was found 841/// during name lookup and/or overload resolution. 842/// DeclRefExprBits.HasTemplateKWAndArgsInfo: 843/// Specifies when this declaration reference expression has an explicit 844/// C++ template keyword and/or template argument list. 845/// DeclRefExprBits.RefersToEnclosingLocal 846/// Specifies when this declaration reference expression (validly) 847/// refers to a local variable from a different function. 848class DeclRefExpr : public Expr { 849 /// \brief The declaration that we are referencing. 850 ValueDecl *D; 851 852 /// \brief The location of the declaration name itself. 853 SourceLocation Loc; 854 855 /// \brief Provides source/type location info for the declaration name 856 /// embedded in D. 857 DeclarationNameLoc DNLoc; 858 859 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 860 NestedNameSpecifierLoc &getInternalQualifierLoc() { 861 assert(hasQualifier()); 862 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 863 } 864 865 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 866 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 867 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 868 } 869 870 /// \brief Test whether there is a distinct FoundDecl attached to the end of 871 /// this DRE. 872 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 873 874 /// \brief Helper to retrieve the optional NamedDecl through which this 875 /// reference occured. 876 NamedDecl *&getInternalFoundDecl() { 877 assert(hasFoundDecl()); 878 if (hasQualifier()) 879 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 880 return *reinterpret_cast<NamedDecl **>(this + 1); 881 } 882 883 /// \brief Helper to retrieve the optional NamedDecl through which this 884 /// reference occured. 885 NamedDecl *getInternalFoundDecl() const { 886 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 887 } 888 889 DeclRefExpr(ASTContext &Ctx, 890 NestedNameSpecifierLoc QualifierLoc, 891 SourceLocation TemplateKWLoc, 892 ValueDecl *D, bool refersToEnclosingLocal, 893 const DeclarationNameInfo &NameInfo, 894 NamedDecl *FoundD, 895 const TemplateArgumentListInfo *TemplateArgs, 896 QualType T, ExprValueKind VK); 897 898 /// \brief Construct an empty declaration reference expression. 899 explicit DeclRefExpr(EmptyShell Empty) 900 : Expr(DeclRefExprClass, Empty) { } 901 902 /// \brief Computes the type- and value-dependence flags for this 903 /// declaration reference expression. 904 void computeDependence(ASTContext &C); 905 906public: 907 DeclRefExpr(ValueDecl *D, bool refersToEnclosingLocal, QualType T, 908 ExprValueKind VK, SourceLocation L, 909 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 910 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 911 D(D), Loc(L), DNLoc(LocInfo) { 912 DeclRefExprBits.HasQualifier = 0; 913 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 914 DeclRefExprBits.HasFoundDecl = 0; 915 DeclRefExprBits.HadMultipleCandidates = 0; 916 DeclRefExprBits.RefersToEnclosingLocal = refersToEnclosingLocal; 917 computeDependence(D->getASTContext()); 918 } 919 920 static DeclRefExpr *Create(ASTContext &Context, 921 NestedNameSpecifierLoc QualifierLoc, 922 SourceLocation TemplateKWLoc, 923 ValueDecl *D, 924 bool isEnclosingLocal, 925 SourceLocation NameLoc, 926 QualType T, ExprValueKind VK, 927 NamedDecl *FoundD = 0, 928 const TemplateArgumentListInfo *TemplateArgs = 0); 929 930 static DeclRefExpr *Create(ASTContext &Context, 931 NestedNameSpecifierLoc QualifierLoc, 932 SourceLocation TemplateKWLoc, 933 ValueDecl *D, 934 bool isEnclosingLocal, 935 const DeclarationNameInfo &NameInfo, 936 QualType T, ExprValueKind VK, 937 NamedDecl *FoundD = 0, 938 const TemplateArgumentListInfo *TemplateArgs = 0); 939 940 /// \brief Construct an empty declaration reference expression. 941 static DeclRefExpr *CreateEmpty(ASTContext &Context, 942 bool HasQualifier, 943 bool HasFoundDecl, 944 bool HasTemplateKWAndArgsInfo, 945 unsigned NumTemplateArgs); 946 947 ValueDecl *getDecl() { return D; } 948 const ValueDecl *getDecl() const { return D; } 949 void setDecl(ValueDecl *NewD) { D = NewD; } 950 951 DeclarationNameInfo getNameInfo() const { 952 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 953 } 954 955 SourceLocation getLocation() const { return Loc; } 956 void setLocation(SourceLocation L) { Loc = L; } 957 SourceRange getSourceRange() const LLVM_READONLY; 958 SourceLocation getLocStart() const LLVM_READONLY; 959 SourceLocation getLocEnd() const LLVM_READONLY; 960 961 /// \brief Determine whether this declaration reference was preceded by a 962 /// C++ nested-name-specifier, e.g., \c N::foo. 963 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 964 965 /// \brief If the name was qualified, retrieves the nested-name-specifier 966 /// that precedes the name. Otherwise, returns NULL. 967 NestedNameSpecifier *getQualifier() const { 968 if (!hasQualifier()) 969 return 0; 970 971 return getInternalQualifierLoc().getNestedNameSpecifier(); 972 } 973 974 /// \brief If the name was qualified, retrieves the nested-name-specifier 975 /// that precedes the name, with source-location information. 976 NestedNameSpecifierLoc getQualifierLoc() const { 977 if (!hasQualifier()) 978 return NestedNameSpecifierLoc(); 979 980 return getInternalQualifierLoc(); 981 } 982 983 /// \brief Get the NamedDecl through which this reference occured. 984 /// 985 /// This Decl may be different from the ValueDecl actually referred to in the 986 /// presence of using declarations, etc. It always returns non-NULL, and may 987 /// simple return the ValueDecl when appropriate. 988 NamedDecl *getFoundDecl() { 989 return hasFoundDecl() ? getInternalFoundDecl() : D; 990 } 991 992 /// \brief Get the NamedDecl through which this reference occurred. 993 /// See non-const variant. 994 const NamedDecl *getFoundDecl() const { 995 return hasFoundDecl() ? getInternalFoundDecl() : D; 996 } 997 998 bool hasTemplateKWAndArgsInfo() const { 999 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 1000 } 1001 1002 /// \brief Return the optional template keyword and arguments info. 1003 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 1004 if (!hasTemplateKWAndArgsInfo()) 1005 return 0; 1006 1007 if (hasFoundDecl()) 1008 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 1009 &getInternalFoundDecl() + 1); 1010 1011 if (hasQualifier()) 1012 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 1013 &getInternalQualifierLoc() + 1); 1014 1015 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 1016 } 1017 1018 /// \brief Return the optional template keyword and arguments info. 1019 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 1020 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo(); 1021 } 1022 1023 /// \brief Retrieve the location of the template keyword preceding 1024 /// this name, if any. 1025 SourceLocation getTemplateKeywordLoc() const { 1026 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1027 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 1028 } 1029 1030 /// \brief Retrieve the location of the left angle bracket starting the 1031 /// explicit template argument list following the name, if any. 1032 SourceLocation getLAngleLoc() const { 1033 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1034 return getTemplateKWAndArgsInfo()->LAngleLoc; 1035 } 1036 1037 /// \brief Retrieve the location of the right angle bracket ending the 1038 /// explicit template argument list following the name, if any. 1039 SourceLocation getRAngleLoc() const { 1040 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 1041 return getTemplateKWAndArgsInfo()->RAngleLoc; 1042 } 1043 1044 /// \brief Determines whether the name in this declaration reference 1045 /// was preceded by the template keyword. 1046 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 1047 1048 /// \brief Determines whether this declaration reference was followed by an 1049 /// explicit template argument list. 1050 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 1051 1052 /// \brief Retrieve the explicit template argument list that followed the 1053 /// member template name. 1054 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 1055 assert(hasExplicitTemplateArgs()); 1056 return *getTemplateKWAndArgsInfo(); 1057 } 1058 1059 /// \brief Retrieve the explicit template argument list that followed the 1060 /// member template name. 1061 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 1062 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 1063 } 1064 1065 /// \brief Retrieves the optional explicit template arguments. 1066 /// This points to the same data as getExplicitTemplateArgs(), but 1067 /// returns null if there are no explicit template arguments. 1068 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 1069 if (!hasExplicitTemplateArgs()) return 0; 1070 return &getExplicitTemplateArgs(); 1071 } 1072 1073 /// \brief Copies the template arguments (if present) into the given 1074 /// structure. 1075 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1076 if (hasExplicitTemplateArgs()) 1077 getExplicitTemplateArgs().copyInto(List); 1078 } 1079 1080 /// \brief Retrieve the template arguments provided as part of this 1081 /// template-id. 1082 const TemplateArgumentLoc *getTemplateArgs() const { 1083 if (!hasExplicitTemplateArgs()) 1084 return 0; 1085 1086 return getExplicitTemplateArgs().getTemplateArgs(); 1087 } 1088 1089 /// \brief Retrieve the number of template arguments provided as part of this 1090 /// template-id. 1091 unsigned getNumTemplateArgs() const { 1092 if (!hasExplicitTemplateArgs()) 1093 return 0; 1094 1095 return getExplicitTemplateArgs().NumTemplateArgs; 1096 } 1097 1098 /// \brief Returns true if this expression refers to a function that 1099 /// was resolved from an overloaded set having size greater than 1. 1100 bool hadMultipleCandidates() const { 1101 return DeclRefExprBits.HadMultipleCandidates; 1102 } 1103 /// \brief Sets the flag telling whether this expression refers to 1104 /// a function that was resolved from an overloaded set having size 1105 /// greater than 1. 1106 void setHadMultipleCandidates(bool V = true) { 1107 DeclRefExprBits.HadMultipleCandidates = V; 1108 } 1109 1110 /// Does this DeclRefExpr refer to a local declaration from an 1111 /// enclosing function scope? 1112 bool refersToEnclosingLocal() const { 1113 return DeclRefExprBits.RefersToEnclosingLocal; 1114 } 1115 1116 static bool classof(const Stmt *T) { 1117 return T->getStmtClass() == DeclRefExprClass; 1118 } 1119 1120 // Iterators 1121 child_range children() { return child_range(); } 1122 1123 friend class ASTStmtReader; 1124 friend class ASTStmtWriter; 1125}; 1126 1127/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 1128class PredefinedExpr : public Expr { 1129public: 1130 enum IdentType { 1131 Func, 1132 Function, 1133 LFunction, // Same as Function, but as wide string. 1134 PrettyFunction, 1135 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 1136 /// 'virtual' keyword is omitted for virtual member functions. 1137 PrettyFunctionNoVirtual 1138 }; 1139 1140private: 1141 SourceLocation Loc; 1142 IdentType Type; 1143public: 1144 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 1145 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 1146 type->isDependentType(), type->isDependentType(), 1147 type->isInstantiationDependentType(), 1148 /*ContainsUnexpandedParameterPack=*/false), 1149 Loc(l), Type(IT) {} 1150 1151 /// \brief Construct an empty predefined expression. 1152 explicit PredefinedExpr(EmptyShell Empty) 1153 : Expr(PredefinedExprClass, Empty) { } 1154 1155 IdentType getIdentType() const { return Type; } 1156 void setIdentType(IdentType IT) { Type = IT; } 1157 1158 SourceLocation getLocation() const { return Loc; } 1159 void setLocation(SourceLocation L) { Loc = L; } 1160 1161 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1162 1163 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1164 1165 static bool classof(const Stmt *T) { 1166 return T->getStmtClass() == PredefinedExprClass; 1167 } 1168 1169 // Iterators 1170 child_range children() { return child_range(); } 1171}; 1172 1173/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1174/// leaking memory. 1175/// 1176/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1177/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1178/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1179/// the APFloat/APInt values will never get freed. APNumericStorage uses 1180/// ASTContext's allocator for memory allocation. 1181class APNumericStorage { 1182 union { 1183 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1184 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1185 }; 1186 unsigned BitWidth; 1187 1188 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1189 1190 APNumericStorage(const APNumericStorage &) LLVM_DELETED_FUNCTION; 1191 void operator=(const APNumericStorage &) LLVM_DELETED_FUNCTION; 1192 1193protected: 1194 APNumericStorage() : VAL(0), BitWidth(0) { } 1195 1196 llvm::APInt getIntValue() const { 1197 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1198 if (NumWords > 1) 1199 return llvm::APInt(BitWidth, NumWords, pVal); 1200 else 1201 return llvm::APInt(BitWidth, VAL); 1202 } 1203 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1204}; 1205 1206class APIntStorage : private APNumericStorage { 1207public: 1208 llvm::APInt getValue() const { return getIntValue(); } 1209 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1210}; 1211 1212class APFloatStorage : private APNumericStorage { 1213public: 1214 llvm::APFloat getValue(bool IsIEEE) const { 1215 return llvm::APFloat(getIntValue(), IsIEEE); 1216 } 1217 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1218 setIntValue(C, Val.bitcastToAPInt()); 1219 } 1220}; 1221 1222class IntegerLiteral : public Expr, public APIntStorage { 1223 SourceLocation Loc; 1224 1225 /// \brief Construct an empty integer literal. 1226 explicit IntegerLiteral(EmptyShell Empty) 1227 : Expr(IntegerLiteralClass, Empty) { } 1228 1229public: 1230 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1231 // or UnsignedLongLongTy 1232 IntegerLiteral(ASTContext &C, const llvm::APInt &V, QualType type, 1233 SourceLocation l); 1234 1235 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1236 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1237 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1238 /// \param V - the value that the returned integer literal contains. 1239 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1240 QualType type, SourceLocation l); 1241 /// \brief Returns a new empty integer literal. 1242 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1243 1244 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1245 1246 /// \brief Retrieve the location of the literal. 1247 SourceLocation getLocation() const { return Loc; } 1248 1249 void setLocation(SourceLocation Location) { Loc = Location; } 1250 1251 static bool classof(const Stmt *T) { 1252 return T->getStmtClass() == IntegerLiteralClass; 1253 } 1254 1255 // Iterators 1256 child_range children() { return child_range(); } 1257}; 1258 1259class CharacterLiteral : public Expr { 1260public: 1261 enum CharacterKind { 1262 Ascii, 1263 Wide, 1264 UTF16, 1265 UTF32 1266 }; 1267 1268private: 1269 unsigned Value; 1270 SourceLocation Loc; 1271public: 1272 // type should be IntTy 1273 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1274 SourceLocation l) 1275 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1276 false, false), 1277 Value(value), Loc(l) { 1278 CharacterLiteralBits.Kind = kind; 1279 } 1280 1281 /// \brief Construct an empty character literal. 1282 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1283 1284 SourceLocation getLocation() const { return Loc; } 1285 CharacterKind getKind() const { 1286 return static_cast<CharacterKind>(CharacterLiteralBits.Kind); 1287 } 1288 1289 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1290 1291 unsigned getValue() const { return Value; } 1292 1293 void setLocation(SourceLocation Location) { Loc = Location; } 1294 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; } 1295 void setValue(unsigned Val) { Value = Val; } 1296 1297 static bool classof(const Stmt *T) { 1298 return T->getStmtClass() == CharacterLiteralClass; 1299 } 1300 1301 // Iterators 1302 child_range children() { return child_range(); } 1303}; 1304 1305class FloatingLiteral : public Expr, private APFloatStorage { 1306 SourceLocation Loc; 1307 1308 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1309 QualType Type, SourceLocation L); 1310 1311 /// \brief Construct an empty floating-point literal. 1312 explicit FloatingLiteral(ASTContext &C, EmptyShell Empty); 1313 1314public: 1315 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1316 bool isexact, QualType Type, SourceLocation L); 1317 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1318 1319 llvm::APFloat getValue() const { 1320 return APFloatStorage::getValue(FloatingLiteralBits.IsIEEE); 1321 } 1322 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1323 APFloatStorage::setValue(C, Val); 1324 } 1325 1326 bool isExact() const { return FloatingLiteralBits.IsExact; } 1327 void setExact(bool E) { FloatingLiteralBits.IsExact = E; } 1328 1329 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1330 /// double. Note that this may cause loss of precision, but is useful for 1331 /// debugging dumps, etc. 1332 double getValueAsApproximateDouble() const; 1333 1334 SourceLocation getLocation() const { return Loc; } 1335 void setLocation(SourceLocation L) { Loc = L; } 1336 1337 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1338 1339 static bool classof(const Stmt *T) { 1340 return T->getStmtClass() == FloatingLiteralClass; 1341 } 1342 1343 // Iterators 1344 child_range children() { return child_range(); } 1345}; 1346 1347/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1348/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1349/// IntegerLiteral classes. Instances of this class always have a Complex type 1350/// whose element type matches the subexpression. 1351/// 1352class ImaginaryLiteral : public Expr { 1353 Stmt *Val; 1354public: 1355 ImaginaryLiteral(Expr *val, QualType Ty) 1356 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1357 false, false), 1358 Val(val) {} 1359 1360 /// \brief Build an empty imaginary literal. 1361 explicit ImaginaryLiteral(EmptyShell Empty) 1362 : Expr(ImaginaryLiteralClass, Empty) { } 1363 1364 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1365 Expr *getSubExpr() { return cast<Expr>(Val); } 1366 void setSubExpr(Expr *E) { Val = E; } 1367 1368 SourceRange getSourceRange() const LLVM_READONLY { return Val->getSourceRange(); } 1369 static bool classof(const Stmt *T) { 1370 return T->getStmtClass() == ImaginaryLiteralClass; 1371 } 1372 1373 // Iterators 1374 child_range children() { return child_range(&Val, &Val+1); } 1375}; 1376 1377/// StringLiteral - This represents a string literal expression, e.g. "foo" 1378/// or L"bar" (wide strings). The actual string is returned by getStrData() 1379/// is NOT null-terminated, and the length of the string is determined by 1380/// calling getByteLength(). The C type for a string is always a 1381/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1382/// not. 1383/// 1384/// Note that strings in C can be formed by concatenation of multiple string 1385/// literal pptokens in translation phase #6. This keeps track of the locations 1386/// of each of these pieces. 1387/// 1388/// Strings in C can also be truncated and extended by assigning into arrays, 1389/// e.g. with constructs like: 1390/// char X[2] = "foobar"; 1391/// In this case, getByteLength() will return 6, but the string literal will 1392/// have type "char[2]". 1393class StringLiteral : public Expr { 1394public: 1395 enum StringKind { 1396 Ascii, 1397 Wide, 1398 UTF8, 1399 UTF16, 1400 UTF32 1401 }; 1402 1403private: 1404 friend class ASTStmtReader; 1405 1406 union { 1407 const char *asChar; 1408 const uint16_t *asUInt16; 1409 const uint32_t *asUInt32; 1410 } StrData; 1411 unsigned Length; 1412 unsigned CharByteWidth : 4; 1413 unsigned Kind : 3; 1414 unsigned IsPascal : 1; 1415 unsigned NumConcatenated; 1416 SourceLocation TokLocs[1]; 1417 1418 StringLiteral(QualType Ty) : 1419 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1420 false) {} 1421 1422 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1423 1424public: 1425 /// This is the "fully general" constructor that allows representation of 1426 /// strings formed from multiple concatenated tokens. 1427 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1428 bool Pascal, QualType Ty, 1429 const SourceLocation *Loc, unsigned NumStrs); 1430 1431 /// Simple constructor for string literals made from one token. 1432 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1433 bool Pascal, QualType Ty, 1434 SourceLocation Loc) { 1435 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1436 } 1437 1438 /// \brief Construct an empty string literal. 1439 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1440 1441 StringRef getString() const { 1442 assert(CharByteWidth==1 1443 && "This function is used in places that assume strings use char"); 1444 return StringRef(StrData.asChar, getByteLength()); 1445 } 1446 1447 /// Allow access to clients that need the byte representation, such as 1448 /// ASTWriterStmt::VisitStringLiteral(). 1449 StringRef getBytes() const { 1450 // FIXME: StringRef may not be the right type to use as a result for this. 1451 if (CharByteWidth == 1) 1452 return StringRef(StrData.asChar, getByteLength()); 1453 if (CharByteWidth == 4) 1454 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1455 getByteLength()); 1456 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1457 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1458 getByteLength()); 1459 } 1460 1461 void outputString(raw_ostream &OS); 1462 1463 uint32_t getCodeUnit(size_t i) const { 1464 assert(i < Length && "out of bounds access"); 1465 if (CharByteWidth == 1) 1466 return static_cast<unsigned char>(StrData.asChar[i]); 1467 if (CharByteWidth == 4) 1468 return StrData.asUInt32[i]; 1469 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1470 return StrData.asUInt16[i]; 1471 } 1472 1473 unsigned getByteLength() const { return CharByteWidth*Length; } 1474 unsigned getLength() const { return Length; } 1475 unsigned getCharByteWidth() const { return CharByteWidth; } 1476 1477 /// \brief Sets the string data to the given string data. 1478 void setString(ASTContext &C, StringRef Str, 1479 StringKind Kind, bool IsPascal); 1480 1481 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1482 1483 1484 bool isAscii() const { return Kind == Ascii; } 1485 bool isWide() const { return Kind == Wide; } 1486 bool isUTF8() const { return Kind == UTF8; } 1487 bool isUTF16() const { return Kind == UTF16; } 1488 bool isUTF32() const { return Kind == UTF32; } 1489 bool isPascal() const { return IsPascal; } 1490 1491 bool containsNonAsciiOrNull() const { 1492 StringRef Str = getString(); 1493 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1494 if (!isascii(Str[i]) || !Str[i]) 1495 return true; 1496 return false; 1497 } 1498 1499 /// getNumConcatenated - Get the number of string literal tokens that were 1500 /// concatenated in translation phase #6 to form this string literal. 1501 unsigned getNumConcatenated() const { return NumConcatenated; } 1502 1503 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1504 assert(TokNum < NumConcatenated && "Invalid tok number"); 1505 return TokLocs[TokNum]; 1506 } 1507 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1508 assert(TokNum < NumConcatenated && "Invalid tok number"); 1509 TokLocs[TokNum] = L; 1510 } 1511 1512 /// getLocationOfByte - Return a source location that points to the specified 1513 /// byte of this string literal. 1514 /// 1515 /// Strings are amazingly complex. They can be formed from multiple tokens 1516 /// and can have escape sequences in them in addition to the usual trigraph 1517 /// and escaped newline business. This routine handles this complexity. 1518 /// 1519 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1520 const LangOptions &Features, 1521 const TargetInfo &Target) const; 1522 1523 typedef const SourceLocation *tokloc_iterator; 1524 tokloc_iterator tokloc_begin() const { return TokLocs; } 1525 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1526 1527 SourceRange getSourceRange() const LLVM_READONLY { 1528 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1529 } 1530 static bool classof(const Stmt *T) { 1531 return T->getStmtClass() == StringLiteralClass; 1532 } 1533 1534 // Iterators 1535 child_range children() { return child_range(); } 1536}; 1537 1538/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1539/// AST node is only formed if full location information is requested. 1540class ParenExpr : public Expr { 1541 SourceLocation L, R; 1542 Stmt *Val; 1543public: 1544 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1545 : Expr(ParenExprClass, val->getType(), 1546 val->getValueKind(), val->getObjectKind(), 1547 val->isTypeDependent(), val->isValueDependent(), 1548 val->isInstantiationDependent(), 1549 val->containsUnexpandedParameterPack()), 1550 L(l), R(r), Val(val) {} 1551 1552 /// \brief Construct an empty parenthesized expression. 1553 explicit ParenExpr(EmptyShell Empty) 1554 : Expr(ParenExprClass, Empty) { } 1555 1556 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1557 Expr *getSubExpr() { return cast<Expr>(Val); } 1558 void setSubExpr(Expr *E) { Val = E; } 1559 1560 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(L, R); } 1561 1562 /// \brief Get the location of the left parentheses '('. 1563 SourceLocation getLParen() const { return L; } 1564 void setLParen(SourceLocation Loc) { L = Loc; } 1565 1566 /// \brief Get the location of the right parentheses ')'. 1567 SourceLocation getRParen() const { return R; } 1568 void setRParen(SourceLocation Loc) { R = Loc; } 1569 1570 static bool classof(const Stmt *T) { 1571 return T->getStmtClass() == ParenExprClass; 1572 } 1573 1574 // Iterators 1575 child_range children() { return child_range(&Val, &Val+1); } 1576}; 1577 1578 1579/// UnaryOperator - This represents the unary-expression's (except sizeof and 1580/// alignof), the postinc/postdec operators from postfix-expression, and various 1581/// extensions. 1582/// 1583/// Notes on various nodes: 1584/// 1585/// Real/Imag - These return the real/imag part of a complex operand. If 1586/// applied to a non-complex value, the former returns its operand and the 1587/// later returns zero in the type of the operand. 1588/// 1589class UnaryOperator : public Expr { 1590public: 1591 typedef UnaryOperatorKind Opcode; 1592 1593private: 1594 unsigned Opc : 5; 1595 SourceLocation Loc; 1596 Stmt *Val; 1597public: 1598 1599 UnaryOperator(Expr *input, Opcode opc, QualType type, 1600 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1601 : Expr(UnaryOperatorClass, type, VK, OK, 1602 input->isTypeDependent() || type->isDependentType(), 1603 input->isValueDependent(), 1604 (input->isInstantiationDependent() || 1605 type->isInstantiationDependentType()), 1606 input->containsUnexpandedParameterPack()), 1607 Opc(opc), Loc(l), Val(input) {} 1608 1609 /// \brief Build an empty unary operator. 1610 explicit UnaryOperator(EmptyShell Empty) 1611 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1612 1613 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1614 void setOpcode(Opcode O) { Opc = O; } 1615 1616 Expr *getSubExpr() const { return cast<Expr>(Val); } 1617 void setSubExpr(Expr *E) { Val = E; } 1618 1619 /// getOperatorLoc - Return the location of the operator. 1620 SourceLocation getOperatorLoc() const { return Loc; } 1621 void setOperatorLoc(SourceLocation L) { Loc = L; } 1622 1623 /// isPostfix - Return true if this is a postfix operation, like x++. 1624 static bool isPostfix(Opcode Op) { 1625 return Op == UO_PostInc || Op == UO_PostDec; 1626 } 1627 1628 /// isPrefix - Return true if this is a prefix operation, like --x. 1629 static bool isPrefix(Opcode Op) { 1630 return Op == UO_PreInc || Op == UO_PreDec; 1631 } 1632 1633 bool isPrefix() const { return isPrefix(getOpcode()); } 1634 bool isPostfix() const { return isPostfix(getOpcode()); } 1635 1636 static bool isIncrementOp(Opcode Op) { 1637 return Op == UO_PreInc || Op == UO_PostInc; 1638 } 1639 bool isIncrementOp() const { 1640 return isIncrementOp(getOpcode()); 1641 } 1642 1643 static bool isDecrementOp(Opcode Op) { 1644 return Op == UO_PreDec || Op == UO_PostDec; 1645 } 1646 bool isDecrementOp() const { 1647 return isDecrementOp(getOpcode()); 1648 } 1649 1650 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1651 bool isIncrementDecrementOp() const { 1652 return isIncrementDecrementOp(getOpcode()); 1653 } 1654 1655 static bool isArithmeticOp(Opcode Op) { 1656 return Op >= UO_Plus && Op <= UO_LNot; 1657 } 1658 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1659 1660 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1661 /// corresponds to, e.g. "sizeof" or "[pre]++" 1662 static StringRef getOpcodeStr(Opcode Op); 1663 1664 /// \brief Retrieve the unary opcode that corresponds to the given 1665 /// overloaded operator. 1666 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1667 1668 /// \brief Retrieve the overloaded operator kind that corresponds to 1669 /// the given unary opcode. 1670 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1671 1672 SourceRange getSourceRange() const LLVM_READONLY { 1673 if (isPostfix()) 1674 return SourceRange(Val->getLocStart(), Loc); 1675 else 1676 return SourceRange(Loc, Val->getLocEnd()); 1677 } 1678 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; } 1679 1680 static bool classof(const Stmt *T) { 1681 return T->getStmtClass() == UnaryOperatorClass; 1682 } 1683 1684 // Iterators 1685 child_range children() { return child_range(&Val, &Val+1); } 1686}; 1687 1688/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1689/// offsetof(record-type, member-designator). For example, given: 1690/// @code 1691/// struct S { 1692/// float f; 1693/// double d; 1694/// }; 1695/// struct T { 1696/// int i; 1697/// struct S s[10]; 1698/// }; 1699/// @endcode 1700/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1701 1702class OffsetOfExpr : public Expr { 1703public: 1704 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1705 class OffsetOfNode { 1706 public: 1707 /// \brief The kind of offsetof node we have. 1708 enum Kind { 1709 /// \brief An index into an array. 1710 Array = 0x00, 1711 /// \brief A field. 1712 Field = 0x01, 1713 /// \brief A field in a dependent type, known only by its name. 1714 Identifier = 0x02, 1715 /// \brief An implicit indirection through a C++ base class, when the 1716 /// field found is in a base class. 1717 Base = 0x03 1718 }; 1719 1720 private: 1721 enum { MaskBits = 2, Mask = 0x03 }; 1722 1723 /// \brief The source range that covers this part of the designator. 1724 SourceRange Range; 1725 1726 /// \brief The data describing the designator, which comes in three 1727 /// different forms, depending on the lower two bits. 1728 /// - An unsigned index into the array of Expr*'s stored after this node 1729 /// in memory, for [constant-expression] designators. 1730 /// - A FieldDecl*, for references to a known field. 1731 /// - An IdentifierInfo*, for references to a field with a given name 1732 /// when the class type is dependent. 1733 /// - A CXXBaseSpecifier*, for references that look at a field in a 1734 /// base class. 1735 uintptr_t Data; 1736 1737 public: 1738 /// \brief Create an offsetof node that refers to an array element. 1739 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1740 SourceLocation RBracketLoc) 1741 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1742 1743 /// \brief Create an offsetof node that refers to a field. 1744 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1745 SourceLocation NameLoc) 1746 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1747 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1748 1749 /// \brief Create an offsetof node that refers to an identifier. 1750 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1751 SourceLocation NameLoc) 1752 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1753 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1754 1755 /// \brief Create an offsetof node that refers into a C++ base class. 1756 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1757 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1758 1759 /// \brief Determine what kind of offsetof node this is. 1760 Kind getKind() const { 1761 return static_cast<Kind>(Data & Mask); 1762 } 1763 1764 /// \brief For an array element node, returns the index into the array 1765 /// of expressions. 1766 unsigned getArrayExprIndex() const { 1767 assert(getKind() == Array); 1768 return Data >> 2; 1769 } 1770 1771 /// \brief For a field offsetof node, returns the field. 1772 FieldDecl *getField() const { 1773 assert(getKind() == Field); 1774 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1775 } 1776 1777 /// \brief For a field or identifier offsetof node, returns the name of 1778 /// the field. 1779 IdentifierInfo *getFieldName() const; 1780 1781 /// \brief For a base class node, returns the base specifier. 1782 CXXBaseSpecifier *getBase() const { 1783 assert(getKind() == Base); 1784 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1785 } 1786 1787 /// \brief Retrieve the source range that covers this offsetof node. 1788 /// 1789 /// For an array element node, the source range contains the locations of 1790 /// the square brackets. For a field or identifier node, the source range 1791 /// contains the location of the period (if there is one) and the 1792 /// identifier. 1793 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 1794 }; 1795 1796private: 1797 1798 SourceLocation OperatorLoc, RParenLoc; 1799 // Base type; 1800 TypeSourceInfo *TSInfo; 1801 // Number of sub-components (i.e. instances of OffsetOfNode). 1802 unsigned NumComps; 1803 // Number of sub-expressions (i.e. array subscript expressions). 1804 unsigned NumExprs; 1805 1806 OffsetOfExpr(ASTContext &C, QualType type, 1807 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1808 ArrayRef<OffsetOfNode> comps, ArrayRef<Expr*> exprs, 1809 SourceLocation RParenLoc); 1810 1811 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1812 : Expr(OffsetOfExprClass, EmptyShell()), 1813 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1814 1815public: 1816 1817 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1818 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1819 ArrayRef<OffsetOfNode> comps, 1820 ArrayRef<Expr*> exprs, SourceLocation RParenLoc); 1821 1822 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1823 unsigned NumComps, unsigned NumExprs); 1824 1825 /// getOperatorLoc - Return the location of the operator. 1826 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1827 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1828 1829 /// \brief Return the location of the right parentheses. 1830 SourceLocation getRParenLoc() const { return RParenLoc; } 1831 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1832 1833 TypeSourceInfo *getTypeSourceInfo() const { 1834 return TSInfo; 1835 } 1836 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1837 TSInfo = tsi; 1838 } 1839 1840 const OffsetOfNode &getComponent(unsigned Idx) const { 1841 assert(Idx < NumComps && "Subscript out of range"); 1842 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1843 } 1844 1845 void setComponent(unsigned Idx, OffsetOfNode ON) { 1846 assert(Idx < NumComps && "Subscript out of range"); 1847 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1848 } 1849 1850 unsigned getNumComponents() const { 1851 return NumComps; 1852 } 1853 1854 Expr* getIndexExpr(unsigned Idx) { 1855 assert(Idx < NumExprs && "Subscript out of range"); 1856 return reinterpret_cast<Expr **>( 1857 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1858 } 1859 const Expr *getIndexExpr(unsigned Idx) const { 1860 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1861 } 1862 1863 void setIndexExpr(unsigned Idx, Expr* E) { 1864 assert(Idx < NumComps && "Subscript out of range"); 1865 reinterpret_cast<Expr **>( 1866 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1867 } 1868 1869 unsigned getNumExpressions() const { 1870 return NumExprs; 1871 } 1872 1873 SourceRange getSourceRange() const LLVM_READONLY { 1874 return SourceRange(OperatorLoc, RParenLoc); 1875 } 1876 1877 static bool classof(const Stmt *T) { 1878 return T->getStmtClass() == OffsetOfExprClass; 1879 } 1880 1881 // Iterators 1882 child_range children() { 1883 Stmt **begin = 1884 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1885 + NumComps); 1886 return child_range(begin, begin + NumExprs); 1887 } 1888}; 1889 1890/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1891/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1892/// vec_step (OpenCL 1.1 6.11.12). 1893class UnaryExprOrTypeTraitExpr : public Expr { 1894 union { 1895 TypeSourceInfo *Ty; 1896 Stmt *Ex; 1897 } Argument; 1898 SourceLocation OpLoc, RParenLoc; 1899 1900public: 1901 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1902 QualType resultType, SourceLocation op, 1903 SourceLocation rp) : 1904 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1905 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1906 // Value-dependent if the argument is type-dependent. 1907 TInfo->getType()->isDependentType(), 1908 TInfo->getType()->isInstantiationDependentType(), 1909 TInfo->getType()->containsUnexpandedParameterPack()), 1910 OpLoc(op), RParenLoc(rp) { 1911 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1912 UnaryExprOrTypeTraitExprBits.IsType = true; 1913 Argument.Ty = TInfo; 1914 } 1915 1916 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1917 QualType resultType, SourceLocation op, 1918 SourceLocation rp) : 1919 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1920 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1921 // Value-dependent if the argument is type-dependent. 1922 E->isTypeDependent(), 1923 E->isInstantiationDependent(), 1924 E->containsUnexpandedParameterPack()), 1925 OpLoc(op), RParenLoc(rp) { 1926 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1927 UnaryExprOrTypeTraitExprBits.IsType = false; 1928 Argument.Ex = E; 1929 } 1930 1931 /// \brief Construct an empty sizeof/alignof expression. 1932 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1933 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1934 1935 UnaryExprOrTypeTrait getKind() const { 1936 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind); 1937 } 1938 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;} 1939 1940 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; } 1941 QualType getArgumentType() const { 1942 return getArgumentTypeInfo()->getType(); 1943 } 1944 TypeSourceInfo *getArgumentTypeInfo() const { 1945 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1946 return Argument.Ty; 1947 } 1948 Expr *getArgumentExpr() { 1949 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1950 return static_cast<Expr*>(Argument.Ex); 1951 } 1952 const Expr *getArgumentExpr() const { 1953 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1954 } 1955 1956 void setArgument(Expr *E) { 1957 Argument.Ex = E; 1958 UnaryExprOrTypeTraitExprBits.IsType = false; 1959 } 1960 void setArgument(TypeSourceInfo *TInfo) { 1961 Argument.Ty = TInfo; 1962 UnaryExprOrTypeTraitExprBits.IsType = true; 1963 } 1964 1965 /// Gets the argument type, or the type of the argument expression, whichever 1966 /// is appropriate. 1967 QualType getTypeOfArgument() const { 1968 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1969 } 1970 1971 SourceLocation getOperatorLoc() const { return OpLoc; } 1972 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1973 1974 SourceLocation getRParenLoc() const { return RParenLoc; } 1975 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1976 1977 SourceRange getSourceRange() const LLVM_READONLY { 1978 return SourceRange(OpLoc, RParenLoc); 1979 } 1980 1981 static bool classof(const Stmt *T) { 1982 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1983 } 1984 1985 // Iterators 1986 child_range children(); 1987}; 1988 1989//===----------------------------------------------------------------------===// 1990// Postfix Operators. 1991//===----------------------------------------------------------------------===// 1992 1993/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1994class ArraySubscriptExpr : public Expr { 1995 enum { LHS, RHS, END_EXPR=2 }; 1996 Stmt* SubExprs[END_EXPR]; 1997 SourceLocation RBracketLoc; 1998public: 1999 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 2000 ExprValueKind VK, ExprObjectKind OK, 2001 SourceLocation rbracketloc) 2002 : Expr(ArraySubscriptExprClass, t, VK, OK, 2003 lhs->isTypeDependent() || rhs->isTypeDependent(), 2004 lhs->isValueDependent() || rhs->isValueDependent(), 2005 (lhs->isInstantiationDependent() || 2006 rhs->isInstantiationDependent()), 2007 (lhs->containsUnexpandedParameterPack() || 2008 rhs->containsUnexpandedParameterPack())), 2009 RBracketLoc(rbracketloc) { 2010 SubExprs[LHS] = lhs; 2011 SubExprs[RHS] = rhs; 2012 } 2013 2014 /// \brief Create an empty array subscript expression. 2015 explicit ArraySubscriptExpr(EmptyShell Shell) 2016 : Expr(ArraySubscriptExprClass, Shell) { } 2017 2018 /// An array access can be written A[4] or 4[A] (both are equivalent). 2019 /// - getBase() and getIdx() always present the normalized view: A[4]. 2020 /// In this case getBase() returns "A" and getIdx() returns "4". 2021 /// - getLHS() and getRHS() present the syntactic view. e.g. for 2022 /// 4[A] getLHS() returns "4". 2023 /// Note: Because vector element access is also written A[4] we must 2024 /// predicate the format conversion in getBase and getIdx only on the 2025 /// the type of the RHS, as it is possible for the LHS to be a vector of 2026 /// integer type 2027 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 2028 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2029 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2030 2031 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 2032 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2033 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2034 2035 Expr *getBase() { 2036 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 2037 } 2038 2039 const Expr *getBase() const { 2040 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 2041 } 2042 2043 Expr *getIdx() { 2044 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2045 } 2046 2047 const Expr *getIdx() const { 2048 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 2049 } 2050 2051 SourceRange getSourceRange() const LLVM_READONLY { 2052 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 2053 } 2054 2055 SourceLocation getRBracketLoc() const { return RBracketLoc; } 2056 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 2057 2058 SourceLocation getExprLoc() const LLVM_READONLY { return getBase()->getExprLoc(); } 2059 2060 static bool classof(const Stmt *T) { 2061 return T->getStmtClass() == ArraySubscriptExprClass; 2062 } 2063 2064 // Iterators 2065 child_range children() { 2066 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2067 } 2068}; 2069 2070 2071/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 2072/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 2073/// while its subclasses may represent alternative syntax that (semantically) 2074/// results in a function call. For example, CXXOperatorCallExpr is 2075/// a subclass for overloaded operator calls that use operator syntax, e.g., 2076/// "str1 + str2" to resolve to a function call. 2077class CallExpr : public Expr { 2078 enum { FN=0, PREARGS_START=1 }; 2079 Stmt **SubExprs; 2080 unsigned NumArgs; 2081 SourceLocation RParenLoc; 2082 2083protected: 2084 // These versions of the constructor are for derived classes. 2085 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 2086 ArrayRef<Expr*> args, QualType t, ExprValueKind VK, 2087 SourceLocation rparenloc); 2088 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 2089 2090 Stmt *getPreArg(unsigned i) { 2091 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2092 return SubExprs[PREARGS_START+i]; 2093 } 2094 const Stmt *getPreArg(unsigned i) const { 2095 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2096 return SubExprs[PREARGS_START+i]; 2097 } 2098 void setPreArg(unsigned i, Stmt *PreArg) { 2099 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2100 SubExprs[PREARGS_START+i] = PreArg; 2101 } 2102 2103 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2104 2105public: 2106 CallExpr(ASTContext& C, Expr *fn, ArrayRef<Expr*> args, QualType t, 2107 ExprValueKind VK, SourceLocation rparenloc); 2108 2109 /// \brief Build an empty call expression. 2110 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 2111 2112 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2113 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2114 void setCallee(Expr *F) { SubExprs[FN] = F; } 2115 2116 Decl *getCalleeDecl(); 2117 const Decl *getCalleeDecl() const { 2118 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2119 } 2120 2121 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2122 FunctionDecl *getDirectCallee(); 2123 const FunctionDecl *getDirectCallee() const { 2124 return const_cast<CallExpr*>(this)->getDirectCallee(); 2125 } 2126 2127 /// getNumArgs - Return the number of actual arguments to this call. 2128 /// 2129 unsigned getNumArgs() const { return NumArgs; } 2130 2131 /// \brief Retrieve the call arguments. 2132 Expr **getArgs() { 2133 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2134 } 2135 const Expr *const *getArgs() const { 2136 return const_cast<CallExpr*>(this)->getArgs(); 2137 } 2138 2139 /// getArg - Return the specified argument. 2140 Expr *getArg(unsigned Arg) { 2141 assert(Arg < NumArgs && "Arg access out of range!"); 2142 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2143 } 2144 const Expr *getArg(unsigned Arg) const { 2145 assert(Arg < NumArgs && "Arg access out of range!"); 2146 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2147 } 2148 2149 /// setArg - Set the specified argument. 2150 void setArg(unsigned Arg, Expr *ArgExpr) { 2151 assert(Arg < NumArgs && "Arg access out of range!"); 2152 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2153 } 2154 2155 /// setNumArgs - This changes the number of arguments present in this call. 2156 /// Any orphaned expressions are deleted by this, and any new operands are set 2157 /// to null. 2158 void setNumArgs(ASTContext& C, unsigned NumArgs); 2159 2160 typedef ExprIterator arg_iterator; 2161 typedef ConstExprIterator const_arg_iterator; 2162 2163 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2164 arg_iterator arg_end() { 2165 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2166 } 2167 const_arg_iterator arg_begin() const { 2168 return SubExprs+PREARGS_START+getNumPreArgs(); 2169 } 2170 const_arg_iterator arg_end() const { 2171 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2172 } 2173 2174 /// getNumCommas - Return the number of commas that must have been present in 2175 /// this function call. 2176 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2177 2178 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2179 /// not, return 0. 2180 unsigned isBuiltinCall() const; 2181 2182 /// getCallReturnType - Get the return type of the call expr. This is not 2183 /// always the type of the expr itself, if the return type is a reference 2184 /// type. 2185 QualType getCallReturnType() const; 2186 2187 SourceLocation getRParenLoc() const { return RParenLoc; } 2188 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2189 2190 SourceRange getSourceRange() const LLVM_READONLY; 2191 SourceLocation getLocStart() const LLVM_READONLY; 2192 SourceLocation getLocEnd() const LLVM_READONLY; 2193 2194 static bool classof(const Stmt *T) { 2195 return T->getStmtClass() >= firstCallExprConstant && 2196 T->getStmtClass() <= lastCallExprConstant; 2197 } 2198 2199 // Iterators 2200 child_range children() { 2201 return child_range(&SubExprs[0], 2202 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2203 } 2204}; 2205 2206/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2207/// 2208class MemberExpr : public Expr { 2209 /// Extra data stored in some member expressions. 2210 struct MemberNameQualifier { 2211 /// \brief The nested-name-specifier that qualifies the name, including 2212 /// source-location information. 2213 NestedNameSpecifierLoc QualifierLoc; 2214 2215 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2216 /// name qualifiers. 2217 DeclAccessPair FoundDecl; 2218 }; 2219 2220 /// Base - the expression for the base pointer or structure references. In 2221 /// X.F, this is "X". 2222 Stmt *Base; 2223 2224 /// MemberDecl - This is the decl being referenced by the field/member name. 2225 /// In X.F, this is the decl referenced by F. 2226 ValueDecl *MemberDecl; 2227 2228 /// MemberDNLoc - Provides source/type location info for the 2229 /// declaration name embedded in MemberDecl. 2230 DeclarationNameLoc MemberDNLoc; 2231 2232 /// MemberLoc - This is the location of the member name. 2233 SourceLocation MemberLoc; 2234 2235 /// IsArrow - True if this is "X->F", false if this is "X.F". 2236 bool IsArrow : 1; 2237 2238 /// \brief True if this member expression used a nested-name-specifier to 2239 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2240 /// declaration. When true, a MemberNameQualifier 2241 /// structure is allocated immediately after the MemberExpr. 2242 bool HasQualifierOrFoundDecl : 1; 2243 2244 /// \brief True if this member expression specified a template keyword 2245 /// and/or a template argument list explicitly, e.g., x->f<int>, 2246 /// x->template f, x->template f<int>. 2247 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2248 /// TemplateArguments (if any) are allocated immediately after 2249 /// the MemberExpr or, if the member expression also has a qualifier, 2250 /// after the MemberNameQualifier structure. 2251 bool HasTemplateKWAndArgsInfo : 1; 2252 2253 /// \brief True if this member expression refers to a method that 2254 /// was resolved from an overloaded set having size greater than 1. 2255 bool HadMultipleCandidates : 1; 2256 2257 /// \brief Retrieve the qualifier that preceded the member name, if any. 2258 MemberNameQualifier *getMemberQualifier() { 2259 assert(HasQualifierOrFoundDecl); 2260 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2261 } 2262 2263 /// \brief Retrieve the qualifier that preceded the member name, if any. 2264 const MemberNameQualifier *getMemberQualifier() const { 2265 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2266 } 2267 2268public: 2269 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2270 const DeclarationNameInfo &NameInfo, QualType ty, 2271 ExprValueKind VK, ExprObjectKind OK) 2272 : Expr(MemberExprClass, ty, VK, OK, 2273 base->isTypeDependent(), 2274 base->isValueDependent(), 2275 base->isInstantiationDependent(), 2276 base->containsUnexpandedParameterPack()), 2277 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()), 2278 MemberLoc(NameInfo.getLoc()), IsArrow(isarrow), 2279 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2280 HadMultipleCandidates(false) { 2281 assert(memberdecl->getDeclName() == NameInfo.getName()); 2282 } 2283 2284 // NOTE: this constructor should be used only when it is known that 2285 // the member name can not provide additional syntactic info 2286 // (i.e., source locations for C++ operator names or type source info 2287 // for constructors, destructors and conversion operators). 2288 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2289 SourceLocation l, QualType ty, 2290 ExprValueKind VK, ExprObjectKind OK) 2291 : Expr(MemberExprClass, ty, VK, OK, 2292 base->isTypeDependent(), base->isValueDependent(), 2293 base->isInstantiationDependent(), 2294 base->containsUnexpandedParameterPack()), 2295 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l), 2296 IsArrow(isarrow), 2297 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2298 HadMultipleCandidates(false) {} 2299 2300 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2301 NestedNameSpecifierLoc QualifierLoc, 2302 SourceLocation TemplateKWLoc, 2303 ValueDecl *memberdecl, DeclAccessPair founddecl, 2304 DeclarationNameInfo MemberNameInfo, 2305 const TemplateArgumentListInfo *targs, 2306 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2307 2308 void setBase(Expr *E) { Base = E; } 2309 Expr *getBase() const { return cast<Expr>(Base); } 2310 2311 /// \brief Retrieve the member declaration to which this expression refers. 2312 /// 2313 /// The returned declaration will either be a FieldDecl or (in C++) 2314 /// a CXXMethodDecl. 2315 ValueDecl *getMemberDecl() const { return MemberDecl; } 2316 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2317 2318 /// \brief Retrieves the declaration found by lookup. 2319 DeclAccessPair getFoundDecl() const { 2320 if (!HasQualifierOrFoundDecl) 2321 return DeclAccessPair::make(getMemberDecl(), 2322 getMemberDecl()->getAccess()); 2323 return getMemberQualifier()->FoundDecl; 2324 } 2325 2326 /// \brief Determines whether this member expression actually had 2327 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2328 /// x->Base::foo. 2329 bool hasQualifier() const { return getQualifier() != 0; } 2330 2331 /// \brief If the member name was qualified, retrieves the 2332 /// nested-name-specifier that precedes the member name. Otherwise, returns 2333 /// NULL. 2334 NestedNameSpecifier *getQualifier() const { 2335 if (!HasQualifierOrFoundDecl) 2336 return 0; 2337 2338 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2339 } 2340 2341 /// \brief If the member name was qualified, retrieves the 2342 /// nested-name-specifier that precedes the member name, with source-location 2343 /// information. 2344 NestedNameSpecifierLoc getQualifierLoc() const { 2345 if (!hasQualifier()) 2346 return NestedNameSpecifierLoc(); 2347 2348 return getMemberQualifier()->QualifierLoc; 2349 } 2350 2351 /// \brief Return the optional template keyword and arguments info. 2352 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 2353 if (!HasTemplateKWAndArgsInfo) 2354 return 0; 2355 2356 if (!HasQualifierOrFoundDecl) 2357 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 2358 2359 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 2360 getMemberQualifier() + 1); 2361 } 2362 2363 /// \brief Return the optional template keyword and arguments info. 2364 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 2365 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo(); 2366 } 2367 2368 /// \brief Retrieve the location of the template keyword preceding 2369 /// the member name, if any. 2370 SourceLocation getTemplateKeywordLoc() const { 2371 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2372 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 2373 } 2374 2375 /// \brief Retrieve the location of the left angle bracket starting the 2376 /// explicit template argument list following the member name, if any. 2377 SourceLocation getLAngleLoc() const { 2378 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2379 return getTemplateKWAndArgsInfo()->LAngleLoc; 2380 } 2381 2382 /// \brief Retrieve the location of the right angle bracket ending the 2383 /// explicit template argument list following the member name, if any. 2384 SourceLocation getRAngleLoc() const { 2385 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2386 return getTemplateKWAndArgsInfo()->RAngleLoc; 2387 } 2388 2389 /// Determines whether the member name was preceded by the template keyword. 2390 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2391 2392 /// \brief Determines whether the member name was followed by an 2393 /// explicit template argument list. 2394 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2395 2396 /// \brief Copies the template arguments (if present) into the given 2397 /// structure. 2398 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2399 if (hasExplicitTemplateArgs()) 2400 getExplicitTemplateArgs().copyInto(List); 2401 } 2402 2403 /// \brief Retrieve the explicit template argument list that 2404 /// follow the member template name. This must only be called on an 2405 /// expression with explicit template arguments. 2406 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2407 assert(hasExplicitTemplateArgs()); 2408 return *getTemplateKWAndArgsInfo(); 2409 } 2410 2411 /// \brief Retrieve the explicit template argument list that 2412 /// followed the member template name. This must only be called on 2413 /// an expression with explicit template arguments. 2414 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2415 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2416 } 2417 2418 /// \brief Retrieves the optional explicit template arguments. 2419 /// This points to the same data as getExplicitTemplateArgs(), but 2420 /// returns null if there are no explicit template arguments. 2421 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2422 if (!hasExplicitTemplateArgs()) return 0; 2423 return &getExplicitTemplateArgs(); 2424 } 2425 2426 /// \brief Retrieve the template arguments provided as part of this 2427 /// template-id. 2428 const TemplateArgumentLoc *getTemplateArgs() const { 2429 if (!hasExplicitTemplateArgs()) 2430 return 0; 2431 2432 return getExplicitTemplateArgs().getTemplateArgs(); 2433 } 2434 2435 /// \brief Retrieve the number of template arguments provided as part of this 2436 /// template-id. 2437 unsigned getNumTemplateArgs() const { 2438 if (!hasExplicitTemplateArgs()) 2439 return 0; 2440 2441 return getExplicitTemplateArgs().NumTemplateArgs; 2442 } 2443 2444 /// \brief Retrieve the member declaration name info. 2445 DeclarationNameInfo getMemberNameInfo() const { 2446 return DeclarationNameInfo(MemberDecl->getDeclName(), 2447 MemberLoc, MemberDNLoc); 2448 } 2449 2450 bool isArrow() const { return IsArrow; } 2451 void setArrow(bool A) { IsArrow = A; } 2452 2453 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2454 /// location of 'F'. 2455 SourceLocation getMemberLoc() const { return MemberLoc; } 2456 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2457 2458 SourceRange getSourceRange() const LLVM_READONLY; 2459 SourceLocation getLocStart() const LLVM_READONLY; 2460 SourceLocation getLocEnd() const LLVM_READONLY; 2461 2462 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; } 2463 2464 /// \brief Determine whether the base of this explicit is implicit. 2465 bool isImplicitAccess() const { 2466 return getBase() && getBase()->isImplicitCXXThis(); 2467 } 2468 2469 /// \brief Returns true if this member expression refers to a method that 2470 /// was resolved from an overloaded set having size greater than 1. 2471 bool hadMultipleCandidates() const { 2472 return HadMultipleCandidates; 2473 } 2474 /// \brief Sets the flag telling whether this expression refers to 2475 /// a method that was resolved from an overloaded set having size 2476 /// greater than 1. 2477 void setHadMultipleCandidates(bool V = true) { 2478 HadMultipleCandidates = V; 2479 } 2480 2481 static bool classof(const Stmt *T) { 2482 return T->getStmtClass() == MemberExprClass; 2483 } 2484 2485 // Iterators 2486 child_range children() { return child_range(&Base, &Base+1); } 2487 2488 friend class ASTReader; 2489 friend class ASTStmtWriter; 2490}; 2491 2492/// CompoundLiteralExpr - [C99 6.5.2.5] 2493/// 2494class CompoundLiteralExpr : public Expr { 2495 /// LParenLoc - If non-null, this is the location of the left paren in a 2496 /// compound literal like "(int){4}". This can be null if this is a 2497 /// synthesized compound expression. 2498 SourceLocation LParenLoc; 2499 2500 /// The type as written. This can be an incomplete array type, in 2501 /// which case the actual expression type will be different. 2502 /// The int part of the pair stores whether this expr is file scope. 2503 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope; 2504 Stmt *Init; 2505public: 2506 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2507 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2508 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2509 tinfo->getType()->isDependentType(), 2510 init->isValueDependent(), 2511 (init->isInstantiationDependent() || 2512 tinfo->getType()->isInstantiationDependentType()), 2513 init->containsUnexpandedParameterPack()), 2514 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {} 2515 2516 /// \brief Construct an empty compound literal. 2517 explicit CompoundLiteralExpr(EmptyShell Empty) 2518 : Expr(CompoundLiteralExprClass, Empty) { } 2519 2520 const Expr *getInitializer() const { return cast<Expr>(Init); } 2521 Expr *getInitializer() { return cast<Expr>(Init); } 2522 void setInitializer(Expr *E) { Init = E; } 2523 2524 bool isFileScope() const { return TInfoAndScope.getInt(); } 2525 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); } 2526 2527 SourceLocation getLParenLoc() const { return LParenLoc; } 2528 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2529 2530 TypeSourceInfo *getTypeSourceInfo() const { 2531 return TInfoAndScope.getPointer(); 2532 } 2533 void setTypeSourceInfo(TypeSourceInfo *tinfo) { 2534 TInfoAndScope.setPointer(tinfo); 2535 } 2536 2537 SourceRange getSourceRange() const LLVM_READONLY { 2538 // FIXME: Init should never be null. 2539 if (!Init) 2540 return SourceRange(); 2541 if (LParenLoc.isInvalid()) 2542 return Init->getSourceRange(); 2543 return SourceRange(LParenLoc, Init->getLocEnd()); 2544 } 2545 2546 static bool classof(const Stmt *T) { 2547 return T->getStmtClass() == CompoundLiteralExprClass; 2548 } 2549 2550 // Iterators 2551 child_range children() { return child_range(&Init, &Init+1); } 2552}; 2553 2554/// CastExpr - Base class for type casts, including both implicit 2555/// casts (ImplicitCastExpr) and explicit casts that have some 2556/// representation in the source code (ExplicitCastExpr's derived 2557/// classes). 2558class CastExpr : public Expr { 2559public: 2560 typedef clang::CastKind CastKind; 2561 2562private: 2563 Stmt *Op; 2564 2565 void CheckCastConsistency() const; 2566 2567 const CXXBaseSpecifier * const *path_buffer() const { 2568 return const_cast<CastExpr*>(this)->path_buffer(); 2569 } 2570 CXXBaseSpecifier **path_buffer(); 2571 2572 void setBasePathSize(unsigned basePathSize) { 2573 CastExprBits.BasePathSize = basePathSize; 2574 assert(CastExprBits.BasePathSize == basePathSize && 2575 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2576 } 2577 2578protected: 2579 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2580 const CastKind kind, Expr *op, unsigned BasePathSize) : 2581 Expr(SC, ty, VK, OK_Ordinary, 2582 // Cast expressions are type-dependent if the type is 2583 // dependent (C++ [temp.dep.expr]p3). 2584 ty->isDependentType(), 2585 // Cast expressions are value-dependent if the type is 2586 // dependent or if the subexpression is value-dependent. 2587 ty->isDependentType() || (op && op->isValueDependent()), 2588 (ty->isInstantiationDependentType() || 2589 (op && op->isInstantiationDependent())), 2590 (ty->containsUnexpandedParameterPack() || 2591 op->containsUnexpandedParameterPack())), 2592 Op(op) { 2593 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2594 CastExprBits.Kind = kind; 2595 setBasePathSize(BasePathSize); 2596#ifndef NDEBUG 2597 CheckCastConsistency(); 2598#endif 2599 } 2600 2601 /// \brief Construct an empty cast. 2602 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2603 : Expr(SC, Empty) { 2604 setBasePathSize(BasePathSize); 2605 } 2606 2607public: 2608 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2609 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2610 const char *getCastKindName() const; 2611 2612 Expr *getSubExpr() { return cast<Expr>(Op); } 2613 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2614 void setSubExpr(Expr *E) { Op = E; } 2615 2616 /// \brief Retrieve the cast subexpression as it was written in the source 2617 /// code, looking through any implicit casts or other intermediate nodes 2618 /// introduced by semantic analysis. 2619 Expr *getSubExprAsWritten(); 2620 const Expr *getSubExprAsWritten() const { 2621 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2622 } 2623 2624 typedef CXXBaseSpecifier **path_iterator; 2625 typedef const CXXBaseSpecifier * const *path_const_iterator; 2626 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2627 unsigned path_size() const { return CastExprBits.BasePathSize; } 2628 path_iterator path_begin() { return path_buffer(); } 2629 path_iterator path_end() { return path_buffer() + path_size(); } 2630 path_const_iterator path_begin() const { return path_buffer(); } 2631 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2632 2633 void setCastPath(const CXXCastPath &Path); 2634 2635 static bool classof(const Stmt *T) { 2636 return T->getStmtClass() >= firstCastExprConstant && 2637 T->getStmtClass() <= lastCastExprConstant; 2638 } 2639 2640 // Iterators 2641 child_range children() { return child_range(&Op, &Op+1); } 2642}; 2643 2644/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2645/// conversions, which have no direct representation in the original 2646/// source code. For example: converting T[]->T*, void f()->void 2647/// (*f)(), float->double, short->int, etc. 2648/// 2649/// In C, implicit casts always produce rvalues. However, in C++, an 2650/// implicit cast whose result is being bound to a reference will be 2651/// an lvalue or xvalue. For example: 2652/// 2653/// @code 2654/// class Base { }; 2655/// class Derived : public Base { }; 2656/// Derived &&ref(); 2657/// void f(Derived d) { 2658/// Base& b = d; // initializer is an ImplicitCastExpr 2659/// // to an lvalue of type Base 2660/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2661/// // to an xvalue of type Base 2662/// } 2663/// @endcode 2664class ImplicitCastExpr : public CastExpr { 2665private: 2666 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2667 unsigned BasePathLength, ExprValueKind VK) 2668 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2669 } 2670 2671 /// \brief Construct an empty implicit cast. 2672 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2673 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2674 2675public: 2676 enum OnStack_t { OnStack }; 2677 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2678 ExprValueKind VK) 2679 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2680 } 2681 2682 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2683 CastKind Kind, Expr *Operand, 2684 const CXXCastPath *BasePath, 2685 ExprValueKind Cat); 2686 2687 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2688 2689 SourceRange getSourceRange() const LLVM_READONLY { 2690 return getSubExpr()->getSourceRange(); 2691 } 2692 SourceLocation getLocStart() const LLVM_READONLY { 2693 return getSubExpr()->getLocStart(); 2694 } 2695 SourceLocation getLocEnd() const LLVM_READONLY { 2696 return getSubExpr()->getLocEnd(); 2697 } 2698 2699 static bool classof(const Stmt *T) { 2700 return T->getStmtClass() == ImplicitCastExprClass; 2701 } 2702}; 2703 2704inline Expr *Expr::IgnoreImpCasts() { 2705 Expr *e = this; 2706 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2707 e = ice->getSubExpr(); 2708 return e; 2709} 2710 2711/// ExplicitCastExpr - An explicit cast written in the source 2712/// code. 2713/// 2714/// This class is effectively an abstract class, because it provides 2715/// the basic representation of an explicitly-written cast without 2716/// specifying which kind of cast (C cast, functional cast, static 2717/// cast, etc.) was written; specific derived classes represent the 2718/// particular style of cast and its location information. 2719/// 2720/// Unlike implicit casts, explicit cast nodes have two different 2721/// types: the type that was written into the source code, and the 2722/// actual type of the expression as determined by semantic 2723/// analysis. These types may differ slightly. For example, in C++ one 2724/// can cast to a reference type, which indicates that the resulting 2725/// expression will be an lvalue or xvalue. The reference type, however, 2726/// will not be used as the type of the expression. 2727class ExplicitCastExpr : public CastExpr { 2728 /// TInfo - Source type info for the (written) type 2729 /// this expression is casting to. 2730 TypeSourceInfo *TInfo; 2731 2732protected: 2733 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2734 CastKind kind, Expr *op, unsigned PathSize, 2735 TypeSourceInfo *writtenTy) 2736 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2737 2738 /// \brief Construct an empty explicit cast. 2739 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2740 : CastExpr(SC, Shell, PathSize) { } 2741 2742public: 2743 /// getTypeInfoAsWritten - Returns the type source info for the type 2744 /// that this expression is casting to. 2745 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2746 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2747 2748 /// getTypeAsWritten - Returns the type that this expression is 2749 /// casting to, as written in the source code. 2750 QualType getTypeAsWritten() const { return TInfo->getType(); } 2751 2752 static bool classof(const Stmt *T) { 2753 return T->getStmtClass() >= firstExplicitCastExprConstant && 2754 T->getStmtClass() <= lastExplicitCastExprConstant; 2755 } 2756}; 2757 2758/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2759/// cast in C++ (C++ [expr.cast]), which uses the syntax 2760/// (Type)expr. For example: @c (int)f. 2761class CStyleCastExpr : public ExplicitCastExpr { 2762 SourceLocation LPLoc; // the location of the left paren 2763 SourceLocation RPLoc; // the location of the right paren 2764 2765 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2766 unsigned PathSize, TypeSourceInfo *writtenTy, 2767 SourceLocation l, SourceLocation r) 2768 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2769 writtenTy), LPLoc(l), RPLoc(r) {} 2770 2771 /// \brief Construct an empty C-style explicit cast. 2772 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2773 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2774 2775public: 2776 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2777 ExprValueKind VK, CastKind K, 2778 Expr *Op, const CXXCastPath *BasePath, 2779 TypeSourceInfo *WrittenTy, SourceLocation L, 2780 SourceLocation R); 2781 2782 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2783 2784 SourceLocation getLParenLoc() const { return LPLoc; } 2785 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2786 2787 SourceLocation getRParenLoc() const { return RPLoc; } 2788 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2789 2790 SourceRange getSourceRange() const LLVM_READONLY { 2791 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2792 } 2793 static bool classof(const Stmt *T) { 2794 return T->getStmtClass() == CStyleCastExprClass; 2795 } 2796}; 2797 2798/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2799/// 2800/// This expression node kind describes a builtin binary operation, 2801/// such as "x + y" for integer values "x" and "y". The operands will 2802/// already have been converted to appropriate types (e.g., by 2803/// performing promotions or conversions). 2804/// 2805/// In C++, where operators may be overloaded, a different kind of 2806/// expression node (CXXOperatorCallExpr) is used to express the 2807/// invocation of an overloaded operator with operator syntax. Within 2808/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2809/// used to store an expression "x + y" depends on the subexpressions 2810/// for x and y. If neither x or y is type-dependent, and the "+" 2811/// operator resolves to a built-in operation, BinaryOperator will be 2812/// used to express the computation (x and y may still be 2813/// value-dependent). If either x or y is type-dependent, or if the 2814/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2815/// be used to express the computation. 2816class BinaryOperator : public Expr { 2817public: 2818 typedef BinaryOperatorKind Opcode; 2819 2820private: 2821 unsigned Opc : 6; 2822 2823 // Records the FP_CONTRACT pragma status at the point that this binary 2824 // operator was parsed. This bit is only meaningful for operations on 2825 // floating point types. For all other types it should default to 2826 // false. 2827 unsigned FPContractable : 1; 2828 SourceLocation OpLoc; 2829 2830 enum { LHS, RHS, END_EXPR }; 2831 Stmt* SubExprs[END_EXPR]; 2832public: 2833 2834 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2835 ExprValueKind VK, ExprObjectKind OK, 2836 SourceLocation opLoc, bool fpContractable) 2837 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2838 lhs->isTypeDependent() || rhs->isTypeDependent(), 2839 lhs->isValueDependent() || rhs->isValueDependent(), 2840 (lhs->isInstantiationDependent() || 2841 rhs->isInstantiationDependent()), 2842 (lhs->containsUnexpandedParameterPack() || 2843 rhs->containsUnexpandedParameterPack())), 2844 Opc(opc), FPContractable(fpContractable), OpLoc(opLoc) { 2845 SubExprs[LHS] = lhs; 2846 SubExprs[RHS] = rhs; 2847 assert(!isCompoundAssignmentOp() && 2848 "Use ArithAssignBinaryOperator for compound assignments"); 2849 } 2850 2851 /// \brief Construct an empty binary operator. 2852 explicit BinaryOperator(EmptyShell Empty) 2853 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2854 2855 SourceLocation getExprLoc() const LLVM_READONLY { return OpLoc; } 2856 SourceLocation getOperatorLoc() const { return OpLoc; } 2857 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2858 2859 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2860 void setOpcode(Opcode O) { Opc = O; } 2861 2862 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2863 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2864 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2865 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2866 2867 SourceRange getSourceRange() const LLVM_READONLY { 2868 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2869 } 2870 2871 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2872 /// corresponds to, e.g. "<<=". 2873 static StringRef getOpcodeStr(Opcode Op); 2874 2875 StringRef getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2876 2877 /// \brief Retrieve the binary opcode that corresponds to the given 2878 /// overloaded operator. 2879 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2880 2881 /// \brief Retrieve the overloaded operator kind that corresponds to 2882 /// the given binary opcode. 2883 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2884 2885 /// predicates to categorize the respective opcodes. 2886 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2887 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2888 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2889 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2890 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2891 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2892 2893 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2894 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2895 2896 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2897 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2898 2899 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2900 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2901 2902 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2903 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2904 2905 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2906 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2907 2908 static bool isAssignmentOp(Opcode Opc) { 2909 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2910 } 2911 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2912 2913 static bool isCompoundAssignmentOp(Opcode Opc) { 2914 return Opc > BO_Assign && Opc <= BO_OrAssign; 2915 } 2916 bool isCompoundAssignmentOp() const { 2917 return isCompoundAssignmentOp(getOpcode()); 2918 } 2919 static Opcode getOpForCompoundAssignment(Opcode Opc) { 2920 assert(isCompoundAssignmentOp(Opc)); 2921 if (Opc >= BO_AndAssign) 2922 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 2923 else 2924 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 2925 } 2926 2927 static bool isShiftAssignOp(Opcode Opc) { 2928 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2929 } 2930 bool isShiftAssignOp() const { 2931 return isShiftAssignOp(getOpcode()); 2932 } 2933 2934 static bool classof(const Stmt *S) { 2935 return S->getStmtClass() >= firstBinaryOperatorConstant && 2936 S->getStmtClass() <= lastBinaryOperatorConstant; 2937 } 2938 2939 // Iterators 2940 child_range children() { 2941 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2942 } 2943 2944 // Set the FP contractability status of this operator. Only meaningful for 2945 // operations on floating point types. 2946 void setFPContractable(bool FPC) { FPContractable = FPC; } 2947 2948 // Get the FP contractability status of this operator. Only meaningful for 2949 // operations on floating point types. 2950 bool isFPContractable() const { return FPContractable; } 2951 2952protected: 2953 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2954 ExprValueKind VK, ExprObjectKind OK, 2955 SourceLocation opLoc, bool fpContractable, bool dead2) 2956 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2957 lhs->isTypeDependent() || rhs->isTypeDependent(), 2958 lhs->isValueDependent() || rhs->isValueDependent(), 2959 (lhs->isInstantiationDependent() || 2960 rhs->isInstantiationDependent()), 2961 (lhs->containsUnexpandedParameterPack() || 2962 rhs->containsUnexpandedParameterPack())), 2963 Opc(opc), FPContractable(fpContractable), OpLoc(opLoc) { 2964 SubExprs[LHS] = lhs; 2965 SubExprs[RHS] = rhs; 2966 } 2967 2968 BinaryOperator(StmtClass SC, EmptyShell Empty) 2969 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2970}; 2971 2972/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2973/// track of the type the operation is performed in. Due to the semantics of 2974/// these operators, the operands are promoted, the arithmetic performed, an 2975/// implicit conversion back to the result type done, then the assignment takes 2976/// place. This captures the intermediate type which the computation is done 2977/// in. 2978class CompoundAssignOperator : public BinaryOperator { 2979 QualType ComputationLHSType; 2980 QualType ComputationResultType; 2981public: 2982 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2983 ExprValueKind VK, ExprObjectKind OK, 2984 QualType CompLHSType, QualType CompResultType, 2985 SourceLocation OpLoc, bool fpContractable) 2986 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, fpContractable, 2987 true), 2988 ComputationLHSType(CompLHSType), 2989 ComputationResultType(CompResultType) { 2990 assert(isCompoundAssignmentOp() && 2991 "Only should be used for compound assignments"); 2992 } 2993 2994 /// \brief Build an empty compound assignment operator expression. 2995 explicit CompoundAssignOperator(EmptyShell Empty) 2996 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2997 2998 // The two computation types are the type the LHS is converted 2999 // to for the computation and the type of the result; the two are 3000 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 3001 QualType getComputationLHSType() const { return ComputationLHSType; } 3002 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 3003 3004 QualType getComputationResultType() const { return ComputationResultType; } 3005 void setComputationResultType(QualType T) { ComputationResultType = T; } 3006 3007 static bool classof(const Stmt *S) { 3008 return S->getStmtClass() == CompoundAssignOperatorClass; 3009 } 3010}; 3011 3012/// AbstractConditionalOperator - An abstract base class for 3013/// ConditionalOperator and BinaryConditionalOperator. 3014class AbstractConditionalOperator : public Expr { 3015 SourceLocation QuestionLoc, ColonLoc; 3016 friend class ASTStmtReader; 3017 3018protected: 3019 AbstractConditionalOperator(StmtClass SC, QualType T, 3020 ExprValueKind VK, ExprObjectKind OK, 3021 bool TD, bool VD, bool ID, 3022 bool ContainsUnexpandedParameterPack, 3023 SourceLocation qloc, 3024 SourceLocation cloc) 3025 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 3026 QuestionLoc(qloc), ColonLoc(cloc) {} 3027 3028 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 3029 : Expr(SC, Empty) { } 3030 3031public: 3032 // getCond - Return the expression representing the condition for 3033 // the ?: operator. 3034 Expr *getCond() const; 3035 3036 // getTrueExpr - Return the subexpression representing the value of 3037 // the expression if the condition evaluates to true. 3038 Expr *getTrueExpr() const; 3039 3040 // getFalseExpr - Return the subexpression representing the value of 3041 // the expression if the condition evaluates to false. This is 3042 // the same as getRHS. 3043 Expr *getFalseExpr() const; 3044 3045 SourceLocation getQuestionLoc() const { return QuestionLoc; } 3046 SourceLocation getColonLoc() const { return ColonLoc; } 3047 3048 static bool classof(const Stmt *T) { 3049 return T->getStmtClass() == ConditionalOperatorClass || 3050 T->getStmtClass() == BinaryConditionalOperatorClass; 3051 } 3052}; 3053 3054/// ConditionalOperator - The ?: ternary operator. The GNU "missing 3055/// middle" extension is a BinaryConditionalOperator. 3056class ConditionalOperator : public AbstractConditionalOperator { 3057 enum { COND, LHS, RHS, END_EXPR }; 3058 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3059 3060 friend class ASTStmtReader; 3061public: 3062 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 3063 SourceLocation CLoc, Expr *rhs, 3064 QualType t, ExprValueKind VK, ExprObjectKind OK) 3065 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 3066 // FIXME: the type of the conditional operator doesn't 3067 // depend on the type of the conditional, but the standard 3068 // seems to imply that it could. File a bug! 3069 (lhs->isTypeDependent() || rhs->isTypeDependent()), 3070 (cond->isValueDependent() || lhs->isValueDependent() || 3071 rhs->isValueDependent()), 3072 (cond->isInstantiationDependent() || 3073 lhs->isInstantiationDependent() || 3074 rhs->isInstantiationDependent()), 3075 (cond->containsUnexpandedParameterPack() || 3076 lhs->containsUnexpandedParameterPack() || 3077 rhs->containsUnexpandedParameterPack()), 3078 QLoc, CLoc) { 3079 SubExprs[COND] = cond; 3080 SubExprs[LHS] = lhs; 3081 SubExprs[RHS] = rhs; 3082 } 3083 3084 /// \brief Build an empty conditional operator. 3085 explicit ConditionalOperator(EmptyShell Empty) 3086 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 3087 3088 // getCond - Return the expression representing the condition for 3089 // the ?: operator. 3090 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3091 3092 // getTrueExpr - Return the subexpression representing the value of 3093 // the expression if the condition evaluates to true. 3094 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3095 3096 // getFalseExpr - Return the subexpression representing the value of 3097 // the expression if the condition evaluates to false. This is 3098 // the same as getRHS. 3099 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3100 3101 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3102 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3103 3104 SourceRange getSourceRange() const LLVM_READONLY { 3105 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 3106 } 3107 static bool classof(const Stmt *T) { 3108 return T->getStmtClass() == ConditionalOperatorClass; 3109 } 3110 3111 // Iterators 3112 child_range children() { 3113 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3114 } 3115}; 3116 3117/// BinaryConditionalOperator - The GNU extension to the conditional 3118/// operator which allows the middle operand to be omitted. 3119/// 3120/// This is a different expression kind on the assumption that almost 3121/// every client ends up needing to know that these are different. 3122class BinaryConditionalOperator : public AbstractConditionalOperator { 3123 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3124 3125 /// - the common condition/left-hand-side expression, which will be 3126 /// evaluated as the opaque value 3127 /// - the condition, expressed in terms of the opaque value 3128 /// - the left-hand-side, expressed in terms of the opaque value 3129 /// - the right-hand-side 3130 Stmt *SubExprs[NUM_SUBEXPRS]; 3131 OpaqueValueExpr *OpaqueValue; 3132 3133 friend class ASTStmtReader; 3134public: 3135 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3136 Expr *cond, Expr *lhs, Expr *rhs, 3137 SourceLocation qloc, SourceLocation cloc, 3138 QualType t, ExprValueKind VK, ExprObjectKind OK) 3139 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3140 (common->isTypeDependent() || rhs->isTypeDependent()), 3141 (common->isValueDependent() || rhs->isValueDependent()), 3142 (common->isInstantiationDependent() || 3143 rhs->isInstantiationDependent()), 3144 (common->containsUnexpandedParameterPack() || 3145 rhs->containsUnexpandedParameterPack()), 3146 qloc, cloc), 3147 OpaqueValue(opaqueValue) { 3148 SubExprs[COMMON] = common; 3149 SubExprs[COND] = cond; 3150 SubExprs[LHS] = lhs; 3151 SubExprs[RHS] = rhs; 3152 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value"); 3153 } 3154 3155 /// \brief Build an empty conditional operator. 3156 explicit BinaryConditionalOperator(EmptyShell Empty) 3157 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3158 3159 /// \brief getCommon - Return the common expression, written to the 3160 /// left of the condition. The opaque value will be bound to the 3161 /// result of this expression. 3162 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3163 3164 /// \brief getOpaqueValue - Return the opaque value placeholder. 3165 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3166 3167 /// \brief getCond - Return the condition expression; this is defined 3168 /// in terms of the opaque value. 3169 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3170 3171 /// \brief getTrueExpr - Return the subexpression which will be 3172 /// evaluated if the condition evaluates to true; this is defined 3173 /// in terms of the opaque value. 3174 Expr *getTrueExpr() const { 3175 return cast<Expr>(SubExprs[LHS]); 3176 } 3177 3178 /// \brief getFalseExpr - Return the subexpression which will be 3179 /// evaluated if the condnition evaluates to false; this is 3180 /// defined in terms of the opaque value. 3181 Expr *getFalseExpr() const { 3182 return cast<Expr>(SubExprs[RHS]); 3183 } 3184 3185 SourceRange getSourceRange() const LLVM_READONLY { 3186 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 3187 } 3188 static bool classof(const Stmt *T) { 3189 return T->getStmtClass() == BinaryConditionalOperatorClass; 3190 } 3191 3192 // Iterators 3193 child_range children() { 3194 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3195 } 3196}; 3197 3198inline Expr *AbstractConditionalOperator::getCond() const { 3199 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3200 return co->getCond(); 3201 return cast<BinaryConditionalOperator>(this)->getCond(); 3202} 3203 3204inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3205 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3206 return co->getTrueExpr(); 3207 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3208} 3209 3210inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3211 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3212 return co->getFalseExpr(); 3213 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3214} 3215 3216/// AddrLabelExpr - The GNU address of label extension, representing &&label. 3217class AddrLabelExpr : public Expr { 3218 SourceLocation AmpAmpLoc, LabelLoc; 3219 LabelDecl *Label; 3220public: 3221 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3222 QualType t) 3223 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3224 false), 3225 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3226 3227 /// \brief Build an empty address of a label expression. 3228 explicit AddrLabelExpr(EmptyShell Empty) 3229 : Expr(AddrLabelExprClass, Empty) { } 3230 3231 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3232 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3233 SourceLocation getLabelLoc() const { return LabelLoc; } 3234 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3235 3236 SourceRange getSourceRange() const LLVM_READONLY { 3237 return SourceRange(AmpAmpLoc, LabelLoc); 3238 } 3239 3240 LabelDecl *getLabel() const { return Label; } 3241 void setLabel(LabelDecl *L) { Label = L; } 3242 3243 static bool classof(const Stmt *T) { 3244 return T->getStmtClass() == AddrLabelExprClass; 3245 } 3246 3247 // Iterators 3248 child_range children() { return child_range(); } 3249}; 3250 3251/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3252/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3253/// takes the value of the last subexpression. 3254/// 3255/// A StmtExpr is always an r-value; values "returned" out of a 3256/// StmtExpr will be copied. 3257class StmtExpr : public Expr { 3258 Stmt *SubStmt; 3259 SourceLocation LParenLoc, RParenLoc; 3260public: 3261 // FIXME: Does type-dependence need to be computed differently? 3262 // FIXME: Do we need to compute instantiation instantiation-dependence for 3263 // statements? (ugh!) 3264 StmtExpr(CompoundStmt *substmt, QualType T, 3265 SourceLocation lp, SourceLocation rp) : 3266 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3267 T->isDependentType(), false, false, false), 3268 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3269 3270 /// \brief Build an empty statement expression. 3271 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3272 3273 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3274 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3275 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3276 3277 SourceRange getSourceRange() const LLVM_READONLY { 3278 return SourceRange(LParenLoc, RParenLoc); 3279 } 3280 3281 SourceLocation getLParenLoc() const { return LParenLoc; } 3282 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3283 SourceLocation getRParenLoc() const { return RParenLoc; } 3284 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3285 3286 static bool classof(const Stmt *T) { 3287 return T->getStmtClass() == StmtExprClass; 3288 } 3289 3290 // Iterators 3291 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3292}; 3293 3294 3295/// ShuffleVectorExpr - clang-specific builtin-in function 3296/// __builtin_shufflevector. 3297/// This AST node represents a operator that does a constant 3298/// shuffle, similar to LLVM's shufflevector instruction. It takes 3299/// two vectors and a variable number of constant indices, 3300/// and returns the appropriately shuffled vector. 3301class ShuffleVectorExpr : public Expr { 3302 SourceLocation BuiltinLoc, RParenLoc; 3303 3304 // SubExprs - the list of values passed to the __builtin_shufflevector 3305 // function. The first two are vectors, and the rest are constant 3306 // indices. The number of values in this list is always 3307 // 2+the number of indices in the vector type. 3308 Stmt **SubExprs; 3309 unsigned NumExprs; 3310 3311public: 3312 ShuffleVectorExpr(ASTContext &C, ArrayRef<Expr*> args, QualType Type, 3313 SourceLocation BLoc, SourceLocation RP); 3314 3315 /// \brief Build an empty vector-shuffle expression. 3316 explicit ShuffleVectorExpr(EmptyShell Empty) 3317 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3318 3319 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3320 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3321 3322 SourceLocation getRParenLoc() const { return RParenLoc; } 3323 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3324 3325 SourceRange getSourceRange() const LLVM_READONLY { 3326 return SourceRange(BuiltinLoc, RParenLoc); 3327 } 3328 static bool classof(const Stmt *T) { 3329 return T->getStmtClass() == ShuffleVectorExprClass; 3330 } 3331 3332 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3333 /// constant expression, the actual arguments passed in, and the function 3334 /// pointers. 3335 unsigned getNumSubExprs() const { return NumExprs; } 3336 3337 /// \brief Retrieve the array of expressions. 3338 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3339 3340 /// getExpr - Return the Expr at the specified index. 3341 Expr *getExpr(unsigned Index) { 3342 assert((Index < NumExprs) && "Arg access out of range!"); 3343 return cast<Expr>(SubExprs[Index]); 3344 } 3345 const Expr *getExpr(unsigned Index) const { 3346 assert((Index < NumExprs) && "Arg access out of range!"); 3347 return cast<Expr>(SubExprs[Index]); 3348 } 3349 3350 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3351 3352 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) const { 3353 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3354 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3355 } 3356 3357 // Iterators 3358 child_range children() { 3359 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3360 } 3361}; 3362 3363/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3364/// This AST node is similar to the conditional operator (?:) in C, with 3365/// the following exceptions: 3366/// - the test expression must be a integer constant expression. 3367/// - the expression returned acts like the chosen subexpression in every 3368/// visible way: the type is the same as that of the chosen subexpression, 3369/// and all predicates (whether it's an l-value, whether it's an integer 3370/// constant expression, etc.) return the same result as for the chosen 3371/// sub-expression. 3372class ChooseExpr : public Expr { 3373 enum { COND, LHS, RHS, END_EXPR }; 3374 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3375 SourceLocation BuiltinLoc, RParenLoc; 3376public: 3377 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3378 QualType t, ExprValueKind VK, ExprObjectKind OK, 3379 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3380 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3381 (cond->isInstantiationDependent() || 3382 lhs->isInstantiationDependent() || 3383 rhs->isInstantiationDependent()), 3384 (cond->containsUnexpandedParameterPack() || 3385 lhs->containsUnexpandedParameterPack() || 3386 rhs->containsUnexpandedParameterPack())), 3387 BuiltinLoc(BLoc), RParenLoc(RP) { 3388 SubExprs[COND] = cond; 3389 SubExprs[LHS] = lhs; 3390 SubExprs[RHS] = rhs; 3391 } 3392 3393 /// \brief Build an empty __builtin_choose_expr. 3394 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3395 3396 /// isConditionTrue - Return whether the condition is true (i.e. not 3397 /// equal to zero). 3398 bool isConditionTrue(const ASTContext &C) const; 3399 3400 /// getChosenSubExpr - Return the subexpression chosen according to the 3401 /// condition. 3402 Expr *getChosenSubExpr(const ASTContext &C) const { 3403 return isConditionTrue(C) ? getLHS() : getRHS(); 3404 } 3405 3406 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3407 void setCond(Expr *E) { SubExprs[COND] = E; } 3408 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3409 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3410 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3411 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3412 3413 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3414 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3415 3416 SourceLocation getRParenLoc() const { return RParenLoc; } 3417 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3418 3419 SourceRange getSourceRange() const LLVM_READONLY { 3420 return SourceRange(BuiltinLoc, RParenLoc); 3421 } 3422 static bool classof(const Stmt *T) { 3423 return T->getStmtClass() == ChooseExprClass; 3424 } 3425 3426 // Iterators 3427 child_range children() { 3428 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3429 } 3430}; 3431 3432/// GNUNullExpr - Implements the GNU __null extension, which is a name 3433/// for a null pointer constant that has integral type (e.g., int or 3434/// long) and is the same size and alignment as a pointer. The __null 3435/// extension is typically only used by system headers, which define 3436/// NULL as __null in C++ rather than using 0 (which is an integer 3437/// that may not match the size of a pointer). 3438class GNUNullExpr : public Expr { 3439 /// TokenLoc - The location of the __null keyword. 3440 SourceLocation TokenLoc; 3441 3442public: 3443 GNUNullExpr(QualType Ty, SourceLocation Loc) 3444 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3445 false), 3446 TokenLoc(Loc) { } 3447 3448 /// \brief Build an empty GNU __null expression. 3449 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3450 3451 /// getTokenLocation - The location of the __null token. 3452 SourceLocation getTokenLocation() const { return TokenLoc; } 3453 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3454 3455 SourceRange getSourceRange() const LLVM_READONLY { 3456 return SourceRange(TokenLoc); 3457 } 3458 static bool classof(const Stmt *T) { 3459 return T->getStmtClass() == GNUNullExprClass; 3460 } 3461 3462 // Iterators 3463 child_range children() { return child_range(); } 3464}; 3465 3466/// VAArgExpr, used for the builtin function __builtin_va_arg. 3467class VAArgExpr : public Expr { 3468 Stmt *Val; 3469 TypeSourceInfo *TInfo; 3470 SourceLocation BuiltinLoc, RParenLoc; 3471public: 3472 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3473 SourceLocation RPLoc, QualType t) 3474 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3475 t->isDependentType(), false, 3476 (TInfo->getType()->isInstantiationDependentType() || 3477 e->isInstantiationDependent()), 3478 (TInfo->getType()->containsUnexpandedParameterPack() || 3479 e->containsUnexpandedParameterPack())), 3480 Val(e), TInfo(TInfo), 3481 BuiltinLoc(BLoc), 3482 RParenLoc(RPLoc) { } 3483 3484 /// \brief Create an empty __builtin_va_arg expression. 3485 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3486 3487 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3488 Expr *getSubExpr() { return cast<Expr>(Val); } 3489 void setSubExpr(Expr *E) { Val = E; } 3490 3491 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3492 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3493 3494 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3495 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3496 3497 SourceLocation getRParenLoc() const { return RParenLoc; } 3498 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3499 3500 SourceRange getSourceRange() const LLVM_READONLY { 3501 return SourceRange(BuiltinLoc, RParenLoc); 3502 } 3503 static bool classof(const Stmt *T) { 3504 return T->getStmtClass() == VAArgExprClass; 3505 } 3506 3507 // Iterators 3508 child_range children() { return child_range(&Val, &Val+1); } 3509}; 3510 3511/// @brief Describes an C or C++ initializer list. 3512/// 3513/// InitListExpr describes an initializer list, which can be used to 3514/// initialize objects of different types, including 3515/// struct/class/union types, arrays, and vectors. For example: 3516/// 3517/// @code 3518/// struct foo x = { 1, { 2, 3 } }; 3519/// @endcode 3520/// 3521/// Prior to semantic analysis, an initializer list will represent the 3522/// initializer list as written by the user, but will have the 3523/// placeholder type "void". This initializer list is called the 3524/// syntactic form of the initializer, and may contain C99 designated 3525/// initializers (represented as DesignatedInitExprs), initializations 3526/// of subobject members without explicit braces, and so on. Clients 3527/// interested in the original syntax of the initializer list should 3528/// use the syntactic form of the initializer list. 3529/// 3530/// After semantic analysis, the initializer list will represent the 3531/// semantic form of the initializer, where the initializations of all 3532/// subobjects are made explicit with nested InitListExpr nodes and 3533/// C99 designators have been eliminated by placing the designated 3534/// initializations into the subobject they initialize. Additionally, 3535/// any "holes" in the initialization, where no initializer has been 3536/// specified for a particular subobject, will be replaced with 3537/// implicitly-generated ImplicitValueInitExpr expressions that 3538/// value-initialize the subobjects. Note, however, that the 3539/// initializer lists may still have fewer initializers than there are 3540/// elements to initialize within the object. 3541/// 3542/// After semantic analysis has completed, given an initializer list, 3543/// method isSemanticForm() returns true if and only if this is the 3544/// semantic form of the initializer list (note: the same AST node 3545/// may at the same time be the syntactic form). 3546/// Given the semantic form of the initializer list, one can retrieve 3547/// the syntactic form of that initializer list (when different) 3548/// using method getSyntacticForm(); the method returns null if applied 3549/// to a initializer list which is already in syntactic form. 3550/// Similarly, given the syntactic form (i.e., an initializer list such 3551/// that isSemanticForm() returns false), one can retrieve the semantic 3552/// form using method getSemanticForm(). 3553/// Since many initializer lists have the same syntactic and semantic forms, 3554/// getSyntacticForm() may return NULL, indicating that the current 3555/// semantic initializer list also serves as its syntactic form. 3556class InitListExpr : public Expr { 3557 // FIXME: Eliminate this vector in favor of ASTContext allocation 3558 typedef ASTVector<Stmt *> InitExprsTy; 3559 InitExprsTy InitExprs; 3560 SourceLocation LBraceLoc, RBraceLoc; 3561 3562 /// The alternative form of the initializer list (if it exists). 3563 /// The int part of the pair stores whether this initalizer list is 3564 /// in semantic form. If not null, the pointer points to: 3565 /// - the syntactic form, if this is in semantic form; 3566 /// - the semantic form, if this is in syntactic form. 3567 llvm::PointerIntPair<InitListExpr *, 1, bool> AltForm; 3568 3569 /// \brief Either: 3570 /// If this initializer list initializes an array with more elements than 3571 /// there are initializers in the list, specifies an expression to be used 3572 /// for value initialization of the rest of the elements. 3573 /// Or 3574 /// If this initializer list initializes a union, specifies which 3575 /// field within the union will be initialized. 3576 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3577 3578public: 3579 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3580 ArrayRef<Expr*> initExprs, SourceLocation rbraceloc); 3581 3582 /// \brief Build an empty initializer list. 3583 explicit InitListExpr(EmptyShell Empty) 3584 : Expr(InitListExprClass, Empty) { } 3585 3586 unsigned getNumInits() const { return InitExprs.size(); } 3587 3588 /// \brief Retrieve the set of initializers. 3589 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3590 3591 const Expr *getInit(unsigned Init) const { 3592 assert(Init < getNumInits() && "Initializer access out of range!"); 3593 return cast_or_null<Expr>(InitExprs[Init]); 3594 } 3595 3596 Expr *getInit(unsigned Init) { 3597 assert(Init < getNumInits() && "Initializer access out of range!"); 3598 return cast_or_null<Expr>(InitExprs[Init]); 3599 } 3600 3601 void setInit(unsigned Init, Expr *expr) { 3602 assert(Init < getNumInits() && "Initializer access out of range!"); 3603 InitExprs[Init] = expr; 3604 } 3605 3606 /// \brief Reserve space for some number of initializers. 3607 void reserveInits(ASTContext &C, unsigned NumInits); 3608 3609 /// @brief Specify the number of initializers 3610 /// 3611 /// If there are more than @p NumInits initializers, the remaining 3612 /// initializers will be destroyed. If there are fewer than @p 3613 /// NumInits initializers, NULL expressions will be added for the 3614 /// unknown initializers. 3615 void resizeInits(ASTContext &Context, unsigned NumInits); 3616 3617 /// @brief Updates the initializer at index @p Init with the new 3618 /// expression @p expr, and returns the old expression at that 3619 /// location. 3620 /// 3621 /// When @p Init is out of range for this initializer list, the 3622 /// initializer list will be extended with NULL expressions to 3623 /// accommodate the new entry. 3624 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3625 3626 /// \brief If this initializer list initializes an array with more elements 3627 /// than there are initializers in the list, specifies an expression to be 3628 /// used for value initialization of the rest of the elements. 3629 Expr *getArrayFiller() { 3630 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3631 } 3632 const Expr *getArrayFiller() const { 3633 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3634 } 3635 void setArrayFiller(Expr *filler); 3636 3637 /// \brief Return true if this is an array initializer and its array "filler" 3638 /// has been set. 3639 bool hasArrayFiller() const { return getArrayFiller(); } 3640 3641 /// \brief If this initializes a union, specifies which field in the 3642 /// union to initialize. 3643 /// 3644 /// Typically, this field is the first named field within the 3645 /// union. However, a designated initializer can specify the 3646 /// initialization of a different field within the union. 3647 FieldDecl *getInitializedFieldInUnion() { 3648 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3649 } 3650 const FieldDecl *getInitializedFieldInUnion() const { 3651 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3652 } 3653 void setInitializedFieldInUnion(FieldDecl *FD) { 3654 ArrayFillerOrUnionFieldInit = FD; 3655 } 3656 3657 // Explicit InitListExpr's originate from source code (and have valid source 3658 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3659 bool isExplicit() { 3660 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3661 } 3662 3663 // Is this an initializer for an array of characters, initialized by a string 3664 // literal or an @encode? 3665 bool isStringLiteralInit() const; 3666 3667 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3668 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3669 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3670 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3671 3672 bool isSemanticForm() const { return AltForm.getInt(); } 3673 InitListExpr *getSemanticForm() const { 3674 return isSemanticForm() ? 0 : AltForm.getPointer(); 3675 } 3676 InitListExpr *getSyntacticForm() const { 3677 return isSemanticForm() ? AltForm.getPointer() : 0; 3678 } 3679 3680 void setSyntacticForm(InitListExpr *Init) { 3681 AltForm.setPointer(Init); 3682 AltForm.setInt(true); 3683 Init->AltForm.setPointer(this); 3684 Init->AltForm.setInt(false); 3685 } 3686 3687 bool hadArrayRangeDesignator() const { 3688 return InitListExprBits.HadArrayRangeDesignator != 0; 3689 } 3690 void sawArrayRangeDesignator(bool ARD = true) { 3691 InitListExprBits.HadArrayRangeDesignator = ARD; 3692 } 3693 3694 bool initializesStdInitializerList() const { 3695 return InitListExprBits.InitializesStdInitializerList != 0; 3696 } 3697 void setInitializesStdInitializerList(bool ISIL = true) { 3698 InitListExprBits.InitializesStdInitializerList = ISIL; 3699 } 3700 3701 SourceRange getSourceRange() const LLVM_READONLY; 3702 3703 static bool classof(const Stmt *T) { 3704 return T->getStmtClass() == InitListExprClass; 3705 } 3706 3707 // Iterators 3708 child_range children() { 3709 if (InitExprs.empty()) return child_range(); 3710 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3711 } 3712 3713 typedef InitExprsTy::iterator iterator; 3714 typedef InitExprsTy::const_iterator const_iterator; 3715 typedef InitExprsTy::reverse_iterator reverse_iterator; 3716 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3717 3718 iterator begin() { return InitExprs.begin(); } 3719 const_iterator begin() const { return InitExprs.begin(); } 3720 iterator end() { return InitExprs.end(); } 3721 const_iterator end() const { return InitExprs.end(); } 3722 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3723 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3724 reverse_iterator rend() { return InitExprs.rend(); } 3725 const_reverse_iterator rend() const { return InitExprs.rend(); } 3726 3727 friend class ASTStmtReader; 3728 friend class ASTStmtWriter; 3729}; 3730 3731/// @brief Represents a C99 designated initializer expression. 3732/// 3733/// A designated initializer expression (C99 6.7.8) contains one or 3734/// more designators (which can be field designators, array 3735/// designators, or GNU array-range designators) followed by an 3736/// expression that initializes the field or element(s) that the 3737/// designators refer to. For example, given: 3738/// 3739/// @code 3740/// struct point { 3741/// double x; 3742/// double y; 3743/// }; 3744/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3745/// @endcode 3746/// 3747/// The InitListExpr contains three DesignatedInitExprs, the first of 3748/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3749/// designators, one array designator for @c [2] followed by one field 3750/// designator for @c .y. The initalization expression will be 1.0. 3751class DesignatedInitExpr : public Expr { 3752public: 3753 /// \brief Forward declaration of the Designator class. 3754 class Designator; 3755 3756private: 3757 /// The location of the '=' or ':' prior to the actual initializer 3758 /// expression. 3759 SourceLocation EqualOrColonLoc; 3760 3761 /// Whether this designated initializer used the GNU deprecated 3762 /// syntax rather than the C99 '=' syntax. 3763 bool GNUSyntax : 1; 3764 3765 /// The number of designators in this initializer expression. 3766 unsigned NumDesignators : 15; 3767 3768 /// The number of subexpressions of this initializer expression, 3769 /// which contains both the initializer and any additional 3770 /// expressions used by array and array-range designators. 3771 unsigned NumSubExprs : 16; 3772 3773 /// \brief The designators in this designated initialization 3774 /// expression. 3775 Designator *Designators; 3776 3777 3778 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3779 const Designator *Designators, 3780 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3781 ArrayRef<Expr*> IndexExprs, Expr *Init); 3782 3783 explicit DesignatedInitExpr(unsigned NumSubExprs) 3784 : Expr(DesignatedInitExprClass, EmptyShell()), 3785 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(0) { } 3786 3787public: 3788 /// A field designator, e.g., ".x". 3789 struct FieldDesignator { 3790 /// Refers to the field that is being initialized. The low bit 3791 /// of this field determines whether this is actually a pointer 3792 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3793 /// initially constructed, a field designator will store an 3794 /// IdentifierInfo*. After semantic analysis has resolved that 3795 /// name, the field designator will instead store a FieldDecl*. 3796 uintptr_t NameOrField; 3797 3798 /// The location of the '.' in the designated initializer. 3799 unsigned DotLoc; 3800 3801 /// The location of the field name in the designated initializer. 3802 unsigned FieldLoc; 3803 }; 3804 3805 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3806 struct ArrayOrRangeDesignator { 3807 /// Location of the first index expression within the designated 3808 /// initializer expression's list of subexpressions. 3809 unsigned Index; 3810 /// The location of the '[' starting the array range designator. 3811 unsigned LBracketLoc; 3812 /// The location of the ellipsis separating the start and end 3813 /// indices. Only valid for GNU array-range designators. 3814 unsigned EllipsisLoc; 3815 /// The location of the ']' terminating the array range designator. 3816 unsigned RBracketLoc; 3817 }; 3818 3819 /// @brief Represents a single C99 designator. 3820 /// 3821 /// @todo This class is infuriatingly similar to clang::Designator, 3822 /// but minor differences (storing indices vs. storing pointers) 3823 /// keep us from reusing it. Try harder, later, to rectify these 3824 /// differences. 3825 class Designator { 3826 /// @brief The kind of designator this describes. 3827 enum { 3828 FieldDesignator, 3829 ArrayDesignator, 3830 ArrayRangeDesignator 3831 } Kind; 3832 3833 union { 3834 /// A field designator, e.g., ".x". 3835 struct FieldDesignator Field; 3836 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3837 struct ArrayOrRangeDesignator ArrayOrRange; 3838 }; 3839 friend class DesignatedInitExpr; 3840 3841 public: 3842 Designator() {} 3843 3844 /// @brief Initializes a field designator. 3845 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3846 SourceLocation FieldLoc) 3847 : Kind(FieldDesignator) { 3848 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3849 Field.DotLoc = DotLoc.getRawEncoding(); 3850 Field.FieldLoc = FieldLoc.getRawEncoding(); 3851 } 3852 3853 /// @brief Initializes an array designator. 3854 Designator(unsigned Index, SourceLocation LBracketLoc, 3855 SourceLocation RBracketLoc) 3856 : Kind(ArrayDesignator) { 3857 ArrayOrRange.Index = Index; 3858 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3859 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3860 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3861 } 3862 3863 /// @brief Initializes a GNU array-range designator. 3864 Designator(unsigned Index, SourceLocation LBracketLoc, 3865 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3866 : Kind(ArrayRangeDesignator) { 3867 ArrayOrRange.Index = Index; 3868 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3869 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3870 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3871 } 3872 3873 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3874 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3875 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3876 3877 IdentifierInfo *getFieldName() const; 3878 3879 FieldDecl *getField() const { 3880 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3881 if (Field.NameOrField & 0x01) 3882 return 0; 3883 else 3884 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3885 } 3886 3887 void setField(FieldDecl *FD) { 3888 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3889 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3890 } 3891 3892 SourceLocation getDotLoc() const { 3893 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3894 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3895 } 3896 3897 SourceLocation getFieldLoc() const { 3898 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3899 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3900 } 3901 3902 SourceLocation getLBracketLoc() const { 3903 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3904 "Only valid on an array or array-range designator"); 3905 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3906 } 3907 3908 SourceLocation getRBracketLoc() const { 3909 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3910 "Only valid on an array or array-range designator"); 3911 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3912 } 3913 3914 SourceLocation getEllipsisLoc() const { 3915 assert(Kind == ArrayRangeDesignator && 3916 "Only valid on an array-range designator"); 3917 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3918 } 3919 3920 unsigned getFirstExprIndex() const { 3921 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3922 "Only valid on an array or array-range designator"); 3923 return ArrayOrRange.Index; 3924 } 3925 3926 SourceLocation getStartLocation() const { 3927 if (Kind == FieldDesignator) 3928 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3929 else 3930 return getLBracketLoc(); 3931 } 3932 SourceLocation getEndLocation() const { 3933 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3934 } 3935 SourceRange getSourceRange() const LLVM_READONLY { 3936 return SourceRange(getStartLocation(), getEndLocation()); 3937 } 3938 }; 3939 3940 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3941 unsigned NumDesignators, 3942 ArrayRef<Expr*> IndexExprs, 3943 SourceLocation EqualOrColonLoc, 3944 bool GNUSyntax, Expr *Init); 3945 3946 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3947 3948 /// @brief Returns the number of designators in this initializer. 3949 unsigned size() const { return NumDesignators; } 3950 3951 // Iterator access to the designators. 3952 typedef Designator *designators_iterator; 3953 designators_iterator designators_begin() { return Designators; } 3954 designators_iterator designators_end() { 3955 return Designators + NumDesignators; 3956 } 3957 3958 typedef const Designator *const_designators_iterator; 3959 const_designators_iterator designators_begin() const { return Designators; } 3960 const_designators_iterator designators_end() const { 3961 return Designators + NumDesignators; 3962 } 3963 3964 typedef std::reverse_iterator<designators_iterator> 3965 reverse_designators_iterator; 3966 reverse_designators_iterator designators_rbegin() { 3967 return reverse_designators_iterator(designators_end()); 3968 } 3969 reverse_designators_iterator designators_rend() { 3970 return reverse_designators_iterator(designators_begin()); 3971 } 3972 3973 typedef std::reverse_iterator<const_designators_iterator> 3974 const_reverse_designators_iterator; 3975 const_reverse_designators_iterator designators_rbegin() const { 3976 return const_reverse_designators_iterator(designators_end()); 3977 } 3978 const_reverse_designators_iterator designators_rend() const { 3979 return const_reverse_designators_iterator(designators_begin()); 3980 } 3981 3982 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3983 3984 void setDesignators(ASTContext &C, const Designator *Desigs, 3985 unsigned NumDesigs); 3986 3987 Expr *getArrayIndex(const Designator& D); 3988 Expr *getArrayRangeStart(const Designator& D); 3989 Expr *getArrayRangeEnd(const Designator& D); 3990 3991 /// @brief Retrieve the location of the '=' that precedes the 3992 /// initializer value itself, if present. 3993 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3994 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3995 3996 /// @brief Determines whether this designated initializer used the 3997 /// deprecated GNU syntax for designated initializers. 3998 bool usesGNUSyntax() const { return GNUSyntax; } 3999 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 4000 4001 /// @brief Retrieve the initializer value. 4002 Expr *getInit() const { 4003 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 4004 } 4005 4006 void setInit(Expr *init) { 4007 *child_begin() = init; 4008 } 4009 4010 /// \brief Retrieve the total number of subexpressions in this 4011 /// designated initializer expression, including the actual 4012 /// initialized value and any expressions that occur within array 4013 /// and array-range designators. 4014 unsigned getNumSubExprs() const { return NumSubExprs; } 4015 4016 Expr *getSubExpr(unsigned Idx) { 4017 assert(Idx < NumSubExprs && "Subscript out of range"); 4018 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 4019 Ptr += sizeof(DesignatedInitExpr); 4020 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 4021 } 4022 4023 void setSubExpr(unsigned Idx, Expr *E) { 4024 assert(Idx < NumSubExprs && "Subscript out of range"); 4025 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 4026 Ptr += sizeof(DesignatedInitExpr); 4027 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 4028 } 4029 4030 /// \brief Replaces the designator at index @p Idx with the series 4031 /// of designators in [First, Last). 4032 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 4033 const Designator *Last); 4034 4035 SourceRange getDesignatorsSourceRange() const; 4036 4037 SourceRange getSourceRange() const LLVM_READONLY; 4038 4039 static bool classof(const Stmt *T) { 4040 return T->getStmtClass() == DesignatedInitExprClass; 4041 } 4042 4043 // Iterators 4044 child_range children() { 4045 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 4046 return child_range(begin, begin + NumSubExprs); 4047 } 4048}; 4049 4050/// \brief Represents an implicitly-generated value initialization of 4051/// an object of a given type. 4052/// 4053/// Implicit value initializations occur within semantic initializer 4054/// list expressions (InitListExpr) as placeholders for subobject 4055/// initializations not explicitly specified by the user. 4056/// 4057/// \see InitListExpr 4058class ImplicitValueInitExpr : public Expr { 4059public: 4060 explicit ImplicitValueInitExpr(QualType ty) 4061 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 4062 false, false, ty->isInstantiationDependentType(), false) { } 4063 4064 /// \brief Construct an empty implicit value initialization. 4065 explicit ImplicitValueInitExpr(EmptyShell Empty) 4066 : Expr(ImplicitValueInitExprClass, Empty) { } 4067 4068 static bool classof(const Stmt *T) { 4069 return T->getStmtClass() == ImplicitValueInitExprClass; 4070 } 4071 4072 SourceRange getSourceRange() const LLVM_READONLY { 4073 return SourceRange(); 4074 } 4075 4076 // Iterators 4077 child_range children() { return child_range(); } 4078}; 4079 4080 4081class ParenListExpr : public Expr { 4082 Stmt **Exprs; 4083 unsigned NumExprs; 4084 SourceLocation LParenLoc, RParenLoc; 4085 4086public: 4087 ParenListExpr(ASTContext& C, SourceLocation lparenloc, ArrayRef<Expr*> exprs, 4088 SourceLocation rparenloc); 4089 4090 /// \brief Build an empty paren list. 4091 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 4092 4093 unsigned getNumExprs() const { return NumExprs; } 4094 4095 const Expr* getExpr(unsigned Init) const { 4096 assert(Init < getNumExprs() && "Initializer access out of range!"); 4097 return cast_or_null<Expr>(Exprs[Init]); 4098 } 4099 4100 Expr* getExpr(unsigned Init) { 4101 assert(Init < getNumExprs() && "Initializer access out of range!"); 4102 return cast_or_null<Expr>(Exprs[Init]); 4103 } 4104 4105 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 4106 4107 SourceLocation getLParenLoc() const { return LParenLoc; } 4108 SourceLocation getRParenLoc() const { return RParenLoc; } 4109 4110 SourceRange getSourceRange() const LLVM_READONLY { 4111 return SourceRange(LParenLoc, RParenLoc); 4112 } 4113 static bool classof(const Stmt *T) { 4114 return T->getStmtClass() == ParenListExprClass; 4115 } 4116 4117 // Iterators 4118 child_range children() { 4119 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4120 } 4121 4122 friend class ASTStmtReader; 4123 friend class ASTStmtWriter; 4124}; 4125 4126 4127/// \brief Represents a C11 generic selection. 4128/// 4129/// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4130/// expression, followed by one or more generic associations. Each generic 4131/// association specifies a type name and an expression, or "default" and an 4132/// expression (in which case it is known as a default generic association). 4133/// The type and value of the generic selection are identical to those of its 4134/// result expression, which is defined as the expression in the generic 4135/// association with a type name that is compatible with the type of the 4136/// controlling expression, or the expression in the default generic association 4137/// if no types are compatible. For example: 4138/// 4139/// @code 4140/// _Generic(X, double: 1, float: 2, default: 3) 4141/// @endcode 4142/// 4143/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4144/// or 3 if "hello". 4145/// 4146/// As an extension, generic selections are allowed in C++, where the following 4147/// additional semantics apply: 4148/// 4149/// Any generic selection whose controlling expression is type-dependent or 4150/// which names a dependent type in its association list is result-dependent, 4151/// which means that the choice of result expression is dependent. 4152/// Result-dependent generic associations are both type- and value-dependent. 4153class GenericSelectionExpr : public Expr { 4154 enum { CONTROLLING, END_EXPR }; 4155 TypeSourceInfo **AssocTypes; 4156 Stmt **SubExprs; 4157 unsigned NumAssocs, ResultIndex; 4158 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4159 4160public: 4161 GenericSelectionExpr(ASTContext &Context, 4162 SourceLocation GenericLoc, Expr *ControllingExpr, 4163 ArrayRef<TypeSourceInfo*> AssocTypes, 4164 ArrayRef<Expr*> AssocExprs, 4165 SourceLocation DefaultLoc, SourceLocation RParenLoc, 4166 bool ContainsUnexpandedParameterPack, 4167 unsigned ResultIndex); 4168 4169 /// This constructor is used in the result-dependent case. 4170 GenericSelectionExpr(ASTContext &Context, 4171 SourceLocation GenericLoc, Expr *ControllingExpr, 4172 ArrayRef<TypeSourceInfo*> AssocTypes, 4173 ArrayRef<Expr*> AssocExprs, 4174 SourceLocation DefaultLoc, SourceLocation RParenLoc, 4175 bool ContainsUnexpandedParameterPack); 4176 4177 explicit GenericSelectionExpr(EmptyShell Empty) 4178 : Expr(GenericSelectionExprClass, Empty) { } 4179 4180 unsigned getNumAssocs() const { return NumAssocs; } 4181 4182 SourceLocation getGenericLoc() const { return GenericLoc; } 4183 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4184 SourceLocation getRParenLoc() const { return RParenLoc; } 4185 4186 const Expr *getAssocExpr(unsigned i) const { 4187 return cast<Expr>(SubExprs[END_EXPR+i]); 4188 } 4189 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4190 4191 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4192 return AssocTypes[i]; 4193 } 4194 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4195 4196 QualType getAssocType(unsigned i) const { 4197 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4198 return TS->getType(); 4199 else 4200 return QualType(); 4201 } 4202 4203 const Expr *getControllingExpr() const { 4204 return cast<Expr>(SubExprs[CONTROLLING]); 4205 } 4206 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4207 4208 /// Whether this generic selection is result-dependent. 4209 bool isResultDependent() const { return ResultIndex == -1U; } 4210 4211 /// The zero-based index of the result expression's generic association in 4212 /// the generic selection's association list. Defined only if the 4213 /// generic selection is not result-dependent. 4214 unsigned getResultIndex() const { 4215 assert(!isResultDependent() && "Generic selection is result-dependent"); 4216 return ResultIndex; 4217 } 4218 4219 /// The generic selection's result expression. Defined only if the 4220 /// generic selection is not result-dependent. 4221 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4222 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4223 4224 SourceRange getSourceRange() const LLVM_READONLY { 4225 return SourceRange(GenericLoc, RParenLoc); 4226 } 4227 static bool classof(const Stmt *T) { 4228 return T->getStmtClass() == GenericSelectionExprClass; 4229 } 4230 4231 child_range children() { 4232 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4233 } 4234 4235 friend class ASTStmtReader; 4236}; 4237 4238//===----------------------------------------------------------------------===// 4239// Clang Extensions 4240//===----------------------------------------------------------------------===// 4241 4242 4243/// ExtVectorElementExpr - This represents access to specific elements of a 4244/// vector, and may occur on the left hand side or right hand side. For example 4245/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4246/// 4247/// Note that the base may have either vector or pointer to vector type, just 4248/// like a struct field reference. 4249/// 4250class ExtVectorElementExpr : public Expr { 4251 Stmt *Base; 4252 IdentifierInfo *Accessor; 4253 SourceLocation AccessorLoc; 4254public: 4255 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4256 IdentifierInfo &accessor, SourceLocation loc) 4257 : Expr(ExtVectorElementExprClass, ty, VK, 4258 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4259 base->isTypeDependent(), base->isValueDependent(), 4260 base->isInstantiationDependent(), 4261 base->containsUnexpandedParameterPack()), 4262 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4263 4264 /// \brief Build an empty vector element expression. 4265 explicit ExtVectorElementExpr(EmptyShell Empty) 4266 : Expr(ExtVectorElementExprClass, Empty) { } 4267 4268 const Expr *getBase() const { return cast<Expr>(Base); } 4269 Expr *getBase() { return cast<Expr>(Base); } 4270 void setBase(Expr *E) { Base = E; } 4271 4272 IdentifierInfo &getAccessor() const { return *Accessor; } 4273 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4274 4275 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4276 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4277 4278 /// getNumElements - Get the number of components being selected. 4279 unsigned getNumElements() const; 4280 4281 /// containsDuplicateElements - Return true if any element access is 4282 /// repeated. 4283 bool containsDuplicateElements() const; 4284 4285 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4286 /// aggregate Constant of ConstantInt(s). 4287 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4288 4289 SourceRange getSourceRange() const LLVM_READONLY { 4290 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4291 } 4292 4293 /// isArrow - Return true if the base expression is a pointer to vector, 4294 /// return false if the base expression is a vector. 4295 bool isArrow() const; 4296 4297 static bool classof(const Stmt *T) { 4298 return T->getStmtClass() == ExtVectorElementExprClass; 4299 } 4300 4301 // Iterators 4302 child_range children() { return child_range(&Base, &Base+1); } 4303}; 4304 4305 4306/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4307/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4308class BlockExpr : public Expr { 4309protected: 4310 BlockDecl *TheBlock; 4311public: 4312 BlockExpr(BlockDecl *BD, QualType ty) 4313 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4314 ty->isDependentType(), ty->isDependentType(), 4315 ty->isInstantiationDependentType() || BD->isDependentContext(), 4316 false), 4317 TheBlock(BD) {} 4318 4319 /// \brief Build an empty block expression. 4320 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4321 4322 const BlockDecl *getBlockDecl() const { return TheBlock; } 4323 BlockDecl *getBlockDecl() { return TheBlock; } 4324 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4325 4326 // Convenience functions for probing the underlying BlockDecl. 4327 SourceLocation getCaretLocation() const; 4328 const Stmt *getBody() const; 4329 Stmt *getBody(); 4330 4331 SourceRange getSourceRange() const LLVM_READONLY { 4332 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4333 } 4334 4335 /// getFunctionType - Return the underlying function type for this block. 4336 const FunctionProtoType *getFunctionType() const; 4337 4338 static bool classof(const Stmt *T) { 4339 return T->getStmtClass() == BlockExprClass; 4340 } 4341 4342 // Iterators 4343 child_range children() { return child_range(); } 4344}; 4345 4346/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4347/// This AST node provides support for reinterpreting a type to another 4348/// type of the same size. 4349class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4350private: 4351 Stmt *SrcExpr; 4352 SourceLocation BuiltinLoc, RParenLoc; 4353 4354 friend class ASTReader; 4355 friend class ASTStmtReader; 4356 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4357 4358public: 4359 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4360 ExprValueKind VK, ExprObjectKind OK, 4361 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4362 : Expr(AsTypeExprClass, DstType, VK, OK, 4363 DstType->isDependentType(), 4364 DstType->isDependentType() || SrcExpr->isValueDependent(), 4365 (DstType->isInstantiationDependentType() || 4366 SrcExpr->isInstantiationDependent()), 4367 (DstType->containsUnexpandedParameterPack() || 4368 SrcExpr->containsUnexpandedParameterPack())), 4369 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4370 4371 /// getSrcExpr - Return the Expr to be converted. 4372 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4373 4374 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4375 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4376 4377 /// getRParenLoc - Return the location of final right parenthesis. 4378 SourceLocation getRParenLoc() const { return RParenLoc; } 4379 4380 SourceRange getSourceRange() const LLVM_READONLY { 4381 return SourceRange(BuiltinLoc, RParenLoc); 4382 } 4383 4384 static bool classof(const Stmt *T) { 4385 return T->getStmtClass() == AsTypeExprClass; 4386 } 4387 4388 // Iterators 4389 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4390}; 4391 4392/// PseudoObjectExpr - An expression which accesses a pseudo-object 4393/// l-value. A pseudo-object is an abstract object, accesses to which 4394/// are translated to calls. The pseudo-object expression has a 4395/// syntactic form, which shows how the expression was actually 4396/// written in the source code, and a semantic form, which is a series 4397/// of expressions to be executed in order which detail how the 4398/// operation is actually evaluated. Optionally, one of the semantic 4399/// forms may also provide a result value for the expression. 4400/// 4401/// If any of the semantic-form expressions is an OpaqueValueExpr, 4402/// that OVE is required to have a source expression, and it is bound 4403/// to the result of that source expression. Such OVEs may appear 4404/// only in subsequent semantic-form expressions and as 4405/// sub-expressions of the syntactic form. 4406/// 4407/// PseudoObjectExpr should be used only when an operation can be 4408/// usefully described in terms of fairly simple rewrite rules on 4409/// objects and functions that are meant to be used by end-developers. 4410/// For example, under the Itanium ABI, dynamic casts are implemented 4411/// as a call to a runtime function called __dynamic_cast; using this 4412/// class to describe that would be inappropriate because that call is 4413/// not really part of the user-visible semantics, and instead the 4414/// cast is properly reflected in the AST and IR-generation has been 4415/// taught to generate the call as necessary. In contrast, an 4416/// Objective-C property access is semantically defined to be 4417/// equivalent to a particular message send, and this is very much 4418/// part of the user model. The name of this class encourages this 4419/// modelling design. 4420class PseudoObjectExpr : public Expr { 4421 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4422 // Always at least two, because the first sub-expression is the 4423 // syntactic form. 4424 4425 // PseudoObjectExprBits.ResultIndex - The index of the 4426 // sub-expression holding the result. 0 means the result is void, 4427 // which is unambiguous because it's the index of the syntactic 4428 // form. Note that this is therefore 1 higher than the value passed 4429 // in to Create, which is an index within the semantic forms. 4430 // Note also that ASTStmtWriter assumes this encoding. 4431 4432 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); } 4433 const Expr * const *getSubExprsBuffer() const { 4434 return reinterpret_cast<const Expr * const *>(this + 1); 4435 } 4436 4437 friend class ASTStmtReader; 4438 4439 PseudoObjectExpr(QualType type, ExprValueKind VK, 4440 Expr *syntactic, ArrayRef<Expr*> semantic, 4441 unsigned resultIndex); 4442 4443 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4444 4445 unsigned getNumSubExprs() const { 4446 return PseudoObjectExprBits.NumSubExprs; 4447 } 4448 4449public: 4450 /// NoResult - A value for the result index indicating that there is 4451 /// no semantic result. 4452 enum { NoResult = ~0U }; 4453 4454 static PseudoObjectExpr *Create(ASTContext &Context, Expr *syntactic, 4455 ArrayRef<Expr*> semantic, 4456 unsigned resultIndex); 4457 4458 static PseudoObjectExpr *Create(ASTContext &Context, EmptyShell shell, 4459 unsigned numSemanticExprs); 4460 4461 /// Return the syntactic form of this expression, i.e. the 4462 /// expression it actually looks like. Likely to be expressed in 4463 /// terms of OpaqueValueExprs bound in the semantic form. 4464 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 4465 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 4466 4467 /// Return the index of the result-bearing expression into the semantics 4468 /// expressions, or PseudoObjectExpr::NoResult if there is none. 4469 unsigned getResultExprIndex() const { 4470 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 4471 return PseudoObjectExprBits.ResultIndex - 1; 4472 } 4473 4474 /// Return the result-bearing expression, or null if there is none. 4475 Expr *getResultExpr() { 4476 if (PseudoObjectExprBits.ResultIndex == 0) 4477 return 0; 4478 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 4479 } 4480 const Expr *getResultExpr() const { 4481 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 4482 } 4483 4484 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 4485 4486 typedef Expr * const *semantics_iterator; 4487 typedef const Expr * const *const_semantics_iterator; 4488 semantics_iterator semantics_begin() { 4489 return getSubExprsBuffer() + 1; 4490 } 4491 const_semantics_iterator semantics_begin() const { 4492 return getSubExprsBuffer() + 1; 4493 } 4494 semantics_iterator semantics_end() { 4495 return getSubExprsBuffer() + getNumSubExprs(); 4496 } 4497 const_semantics_iterator semantics_end() const { 4498 return getSubExprsBuffer() + getNumSubExprs(); 4499 } 4500 Expr *getSemanticExpr(unsigned index) { 4501 assert(index + 1 < getNumSubExprs()); 4502 return getSubExprsBuffer()[index + 1]; 4503 } 4504 const Expr *getSemanticExpr(unsigned index) const { 4505 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 4506 } 4507 4508 SourceLocation getExprLoc() const LLVM_READONLY { 4509 return getSyntacticForm()->getExprLoc(); 4510 } 4511 SourceRange getSourceRange() const LLVM_READONLY { 4512 return getSyntacticForm()->getSourceRange(); 4513 } 4514 4515 child_range children() { 4516 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer()); 4517 return child_range(cs, cs + getNumSubExprs()); 4518 } 4519 4520 static bool classof(const Stmt *T) { 4521 return T->getStmtClass() == PseudoObjectExprClass; 4522 } 4523}; 4524 4525/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4526/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4527/// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>. 4528/// All of these instructions take one primary pointer and at least one memory 4529/// order. 4530class AtomicExpr : public Expr { 4531public: 4532 enum AtomicOp { 4533#define BUILTIN(ID, TYPE, ATTRS) 4534#define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID, 4535#include "clang/Basic/Builtins.def" 4536 // Avoid trailing comma 4537 BI_First = 0 4538 }; 4539 4540private: 4541 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR }; 4542 Stmt* SubExprs[END_EXPR]; 4543 unsigned NumSubExprs; 4544 SourceLocation BuiltinLoc, RParenLoc; 4545 AtomicOp Op; 4546 4547 friend class ASTStmtReader; 4548 4549public: 4550 AtomicExpr(SourceLocation BLoc, ArrayRef<Expr*> args, QualType t, 4551 AtomicOp op, SourceLocation RP); 4552 4553 /// \brief Determine the number of arguments the specified atomic builtin 4554 /// should have. 4555 static unsigned getNumSubExprs(AtomicOp Op); 4556 4557 /// \brief Build an empty AtomicExpr. 4558 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4559 4560 Expr *getPtr() const { 4561 return cast<Expr>(SubExprs[PTR]); 4562 } 4563 Expr *getOrder() const { 4564 return cast<Expr>(SubExprs[ORDER]); 4565 } 4566 Expr *getVal1() const { 4567 if (Op == AO__c11_atomic_init) 4568 return cast<Expr>(SubExprs[ORDER]); 4569 assert(NumSubExprs > VAL1); 4570 return cast<Expr>(SubExprs[VAL1]); 4571 } 4572 Expr *getOrderFail() const { 4573 assert(NumSubExprs > ORDER_FAIL); 4574 return cast<Expr>(SubExprs[ORDER_FAIL]); 4575 } 4576 Expr *getVal2() const { 4577 if (Op == AO__atomic_exchange) 4578 return cast<Expr>(SubExprs[ORDER_FAIL]); 4579 assert(NumSubExprs > VAL2); 4580 return cast<Expr>(SubExprs[VAL2]); 4581 } 4582 Expr *getWeak() const { 4583 assert(NumSubExprs > WEAK); 4584 return cast<Expr>(SubExprs[WEAK]); 4585 } 4586 4587 AtomicOp getOp() const { return Op; } 4588 unsigned getNumSubExprs() { return NumSubExprs; } 4589 4590 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4591 4592 bool isVolatile() const { 4593 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4594 } 4595 4596 bool isCmpXChg() const { 4597 return getOp() == AO__c11_atomic_compare_exchange_strong || 4598 getOp() == AO__c11_atomic_compare_exchange_weak || 4599 getOp() == AO__atomic_compare_exchange || 4600 getOp() == AO__atomic_compare_exchange_n; 4601 } 4602 4603 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4604 SourceLocation getRParenLoc() const { return RParenLoc; } 4605 4606 SourceRange getSourceRange() const LLVM_READONLY { 4607 return SourceRange(BuiltinLoc, RParenLoc); 4608 } 4609 static bool classof(const Stmt *T) { 4610 return T->getStmtClass() == AtomicExprClass; 4611 } 4612 4613 // Iterators 4614 child_range children() { 4615 return child_range(SubExprs, SubExprs+NumSubExprs); 4616 } 4617}; 4618} // end namespace clang 4619 4620#endif 4621