Expr.h revision 478851c3ed6bd784e7377dffd8e57b200c1b9ba9
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/TargetInfo.h" 26#include "clang/Basic/TypeTraits.h" 27#include "llvm/ADT/APSInt.h" 28#include "llvm/ADT/APFloat.h" 29#include "llvm/ADT/SmallVector.h" 30#include "llvm/ADT/StringRef.h" 31#include "llvm/Support/Compiler.h" 32#include <cctype> 33 34namespace clang { 35 class ASTContext; 36 class APValue; 37 class Decl; 38 class IdentifierInfo; 39 class ParmVarDecl; 40 class NamedDecl; 41 class ValueDecl; 42 class BlockDecl; 43 class CXXBaseSpecifier; 44 class CXXOperatorCallExpr; 45 class CXXMemberCallExpr; 46 class ObjCPropertyRefExpr; 47 class OpaqueValueExpr; 48 49/// \brief A simple array of base specifiers. 50typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 51 52/// Expr - This represents one expression. Note that Expr's are subclasses of 53/// Stmt. This allows an expression to be transparently used any place a Stmt 54/// is required. 55/// 56class Expr : public Stmt { 57 QualType TR; 58 59protected: 60 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 61 bool TD, bool VD, bool ID, bool ContainsUnexpandedParameterPack) 62 : Stmt(SC) 63 { 64 ExprBits.TypeDependent = TD; 65 ExprBits.ValueDependent = VD; 66 ExprBits.InstantiationDependent = ID; 67 ExprBits.ValueKind = VK; 68 ExprBits.ObjectKind = OK; 69 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 70 setType(T); 71 } 72 73 /// \brief Construct an empty expression. 74 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 75 76public: 77 QualType getType() const { return TR; } 78 void setType(QualType t) { 79 // In C++, the type of an expression is always adjusted so that it 80 // will not have reference type an expression will never have 81 // reference type (C++ [expr]p6). Use 82 // QualType::getNonReferenceType() to retrieve the non-reference 83 // type. Additionally, inspect Expr::isLvalue to determine whether 84 // an expression that is adjusted in this manner should be 85 // considered an lvalue. 86 assert((t.isNull() || !t->isReferenceType()) && 87 "Expressions can't have reference type"); 88 89 TR = t; 90 } 91 92 /// isValueDependent - Determines whether this expression is 93 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 94 /// array bound of "Chars" in the following example is 95 /// value-dependent. 96 /// @code 97 /// template<int Size, char (&Chars)[Size]> struct meta_string; 98 /// @endcode 99 bool isValueDependent() const { return ExprBits.ValueDependent; } 100 101 /// \brief Set whether this expression is value-dependent or not. 102 void setValueDependent(bool VD) { 103 ExprBits.ValueDependent = VD; 104 if (VD) 105 ExprBits.InstantiationDependent = true; 106 } 107 108 /// isTypeDependent - Determines whether this expression is 109 /// type-dependent (C++ [temp.dep.expr]), which means that its type 110 /// could change from one template instantiation to the next. For 111 /// example, the expressions "x" and "x + y" are type-dependent in 112 /// the following code, but "y" is not type-dependent: 113 /// @code 114 /// template<typename T> 115 /// void add(T x, int y) { 116 /// x + y; 117 /// } 118 /// @endcode 119 bool isTypeDependent() const { return ExprBits.TypeDependent; } 120 121 /// \brief Set whether this expression is type-dependent or not. 122 void setTypeDependent(bool TD) { 123 ExprBits.TypeDependent = TD; 124 if (TD) 125 ExprBits.InstantiationDependent = true; 126 } 127 128 /// \brief Whether this expression is instantiation-dependent, meaning that 129 /// it depends in some way on a template parameter, even if neither its type 130 /// nor (constant) value can change due to the template instantiation. 131 /// 132 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is 133 /// instantiation-dependent (since it involves a template parameter \c T), but 134 /// is neither type- nor value-dependent, since the type of the inner 135 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer 136 /// \c sizeof is known. 137 /// 138 /// \code 139 /// template<typename T> 140 /// void f(T x, T y) { 141 /// sizeof(sizeof(T() + T()); 142 /// } 143 /// \endcode 144 /// 145 bool isInstantiationDependent() const { 146 return ExprBits.InstantiationDependent; 147 } 148 149 /// \brief Set whether this expression is instantiation-dependent or not. 150 void setInstantiationDependent(bool ID) { 151 ExprBits.InstantiationDependent = ID; 152 } 153 154 /// \brief Whether this expression contains an unexpanded parameter 155 /// pack (for C++0x variadic templates). 156 /// 157 /// Given the following function template: 158 /// 159 /// \code 160 /// template<typename F, typename ...Types> 161 /// void forward(const F &f, Types &&...args) { 162 /// f(static_cast<Types&&>(args)...); 163 /// } 164 /// \endcode 165 /// 166 /// The expressions \c args and \c static_cast<Types&&>(args) both 167 /// contain parameter packs. 168 bool containsUnexpandedParameterPack() const { 169 return ExprBits.ContainsUnexpandedParameterPack; 170 } 171 172 /// \brief Set the bit that describes whether this expression 173 /// contains an unexpanded parameter pack. 174 void setContainsUnexpandedParameterPack(bool PP = true) { 175 ExprBits.ContainsUnexpandedParameterPack = PP; 176 } 177 178 /// getExprLoc - Return the preferred location for the arrow when diagnosing 179 /// a problem with a generic expression. 180 SourceLocation getExprLoc() const LLVM_READONLY; 181 182 /// isUnusedResultAWarning - Return true if this immediate expression should 183 /// be warned about if the result is unused. If so, fill in expr, location, 184 /// and ranges with expr to warn on and source locations/ranges appropriate 185 /// for a warning. 186 bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc, 187 SourceRange &R1, SourceRange &R2, 188 ASTContext &Ctx) const; 189 190 /// isLValue - True if this expression is an "l-value" according to 191 /// the rules of the current language. C and C++ give somewhat 192 /// different rules for this concept, but in general, the result of 193 /// an l-value expression identifies a specific object whereas the 194 /// result of an r-value expression is a value detached from any 195 /// specific storage. 196 /// 197 /// C++0x divides the concept of "r-value" into pure r-values 198 /// ("pr-values") and so-called expiring values ("x-values"), which 199 /// identify specific objects that can be safely cannibalized for 200 /// their resources. This is an unfortunate abuse of terminology on 201 /// the part of the C++ committee. In Clang, when we say "r-value", 202 /// we generally mean a pr-value. 203 bool isLValue() const { return getValueKind() == VK_LValue; } 204 bool isRValue() const { return getValueKind() == VK_RValue; } 205 bool isXValue() const { return getValueKind() == VK_XValue; } 206 bool isGLValue() const { return getValueKind() != VK_RValue; } 207 208 enum LValueClassification { 209 LV_Valid, 210 LV_NotObjectType, 211 LV_IncompleteVoidType, 212 LV_DuplicateVectorComponents, 213 LV_InvalidExpression, 214 LV_InvalidMessageExpression, 215 LV_MemberFunction, 216 LV_SubObjCPropertySetting, 217 LV_ClassTemporary, 218 LV_ArrayTemporary 219 }; 220 /// Reasons why an expression might not be an l-value. 221 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 222 223 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 224 /// does not have an incomplete type, does not have a const-qualified type, 225 /// and if it is a structure or union, does not have any member (including, 226 /// recursively, any member or element of all contained aggregates or unions) 227 /// with a const-qualified type. 228 /// 229 /// \param Loc [in,out] - A source location which *may* be filled 230 /// in with the location of the expression making this a 231 /// non-modifiable lvalue, if specified. 232 enum isModifiableLvalueResult { 233 MLV_Valid, 234 MLV_NotObjectType, 235 MLV_IncompleteVoidType, 236 MLV_DuplicateVectorComponents, 237 MLV_InvalidExpression, 238 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 239 MLV_IncompleteType, 240 MLV_ConstQualified, 241 MLV_ArrayType, 242 MLV_ReadonlyProperty, 243 MLV_NoSetterProperty, 244 MLV_MemberFunction, 245 MLV_SubObjCPropertySetting, 246 MLV_InvalidMessageExpression, 247 MLV_ClassTemporary, 248 MLV_ArrayTemporary 249 }; 250 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 251 SourceLocation *Loc = 0) const; 252 253 /// \brief The return type of classify(). Represents the C++0x expression 254 /// taxonomy. 255 class Classification { 256 public: 257 /// \brief The various classification results. Most of these mean prvalue. 258 enum Kinds { 259 CL_LValue, 260 CL_XValue, 261 CL_Function, // Functions cannot be lvalues in C. 262 CL_Void, // Void cannot be an lvalue in C. 263 CL_AddressableVoid, // Void expression whose address can be taken in C. 264 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 265 CL_MemberFunction, // An expression referring to a member function 266 CL_SubObjCPropertySetting, 267 CL_ClassTemporary, // A temporary of class type, or subobject thereof. 268 CL_ArrayTemporary, // A temporary of array type. 269 CL_ObjCMessageRValue, // ObjC message is an rvalue 270 CL_PRValue // A prvalue for any other reason, of any other type 271 }; 272 /// \brief The results of modification testing. 273 enum ModifiableType { 274 CM_Untested, // testModifiable was false. 275 CM_Modifiable, 276 CM_RValue, // Not modifiable because it's an rvalue 277 CM_Function, // Not modifiable because it's a function; C++ only 278 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 279 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 280 CM_ConstQualified, 281 CM_ArrayType, 282 CM_IncompleteType 283 }; 284 285 private: 286 friend class Expr; 287 288 unsigned short Kind; 289 unsigned short Modifiable; 290 291 explicit Classification(Kinds k, ModifiableType m) 292 : Kind(k), Modifiable(m) 293 {} 294 295 public: 296 Classification() {} 297 298 Kinds getKind() const { return static_cast<Kinds>(Kind); } 299 ModifiableType getModifiable() const { 300 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 301 return static_cast<ModifiableType>(Modifiable); 302 } 303 bool isLValue() const { return Kind == CL_LValue; } 304 bool isXValue() const { return Kind == CL_XValue; } 305 bool isGLValue() const { return Kind <= CL_XValue; } 306 bool isPRValue() const { return Kind >= CL_Function; } 307 bool isRValue() const { return Kind >= CL_XValue; } 308 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 309 310 /// \brief Create a simple, modifiably lvalue 311 static Classification makeSimpleLValue() { 312 return Classification(CL_LValue, CM_Modifiable); 313 } 314 315 }; 316 /// \brief Classify - Classify this expression according to the C++0x 317 /// expression taxonomy. 318 /// 319 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 320 /// old lvalue vs rvalue. This function determines the type of expression this 321 /// is. There are three expression types: 322 /// - lvalues are classical lvalues as in C++03. 323 /// - prvalues are equivalent to rvalues in C++03. 324 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 325 /// function returning an rvalue reference. 326 /// lvalues and xvalues are collectively referred to as glvalues, while 327 /// prvalues and xvalues together form rvalues. 328 Classification Classify(ASTContext &Ctx) const { 329 return ClassifyImpl(Ctx, 0); 330 } 331 332 /// \brief ClassifyModifiable - Classify this expression according to the 333 /// C++0x expression taxonomy, and see if it is valid on the left side 334 /// of an assignment. 335 /// 336 /// This function extends classify in that it also tests whether the 337 /// expression is modifiable (C99 6.3.2.1p1). 338 /// \param Loc A source location that might be filled with a relevant location 339 /// if the expression is not modifiable. 340 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 341 return ClassifyImpl(Ctx, &Loc); 342 } 343 344 /// getValueKindForType - Given a formal return or parameter type, 345 /// give its value kind. 346 static ExprValueKind getValueKindForType(QualType T) { 347 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 348 return (isa<LValueReferenceType>(RT) 349 ? VK_LValue 350 : (RT->getPointeeType()->isFunctionType() 351 ? VK_LValue : VK_XValue)); 352 return VK_RValue; 353 } 354 355 /// getValueKind - The value kind that this expression produces. 356 ExprValueKind getValueKind() const { 357 return static_cast<ExprValueKind>(ExprBits.ValueKind); 358 } 359 360 /// getObjectKind - The object kind that this expression produces. 361 /// Object kinds are meaningful only for expressions that yield an 362 /// l-value or x-value. 363 ExprObjectKind getObjectKind() const { 364 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 365 } 366 367 bool isOrdinaryOrBitFieldObject() const { 368 ExprObjectKind OK = getObjectKind(); 369 return (OK == OK_Ordinary || OK == OK_BitField); 370 } 371 372 /// setValueKind - Set the value kind produced by this expression. 373 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 374 375 /// setObjectKind - Set the object kind produced by this expression. 376 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 377 378private: 379 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 380 381public: 382 383 /// \brief If this expression refers to a bit-field, retrieve the 384 /// declaration of that bit-field. 385 FieldDecl *getBitField(); 386 387 const FieldDecl *getBitField() const { 388 return const_cast<Expr*>(this)->getBitField(); 389 } 390 391 /// \brief If this expression is an l-value for an Objective C 392 /// property, find the underlying property reference expression. 393 const ObjCPropertyRefExpr *getObjCProperty() const; 394 395 /// \brief Returns whether this expression refers to a vector element. 396 bool refersToVectorElement() const; 397 398 /// \brief Returns whether this expression has a placeholder type. 399 bool hasPlaceholderType() const { 400 return getType()->isPlaceholderType(); 401 } 402 403 /// \brief Returns whether this expression has a specific placeholder type. 404 bool hasPlaceholderType(BuiltinType::Kind K) const { 405 assert(BuiltinType::isPlaceholderTypeKind(K)); 406 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType())) 407 return BT->getKind() == K; 408 return false; 409 } 410 411 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 412 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 413 /// but also int expressions which are produced by things like comparisons in 414 /// C. 415 bool isKnownToHaveBooleanValue() const; 416 417 /// isIntegerConstantExpr - Return true if this expression is a valid integer 418 /// constant expression, and, if so, return its value in Result. If not a 419 /// valid i-c-e, return false and fill in Loc (if specified) with the location 420 /// of the invalid expression. 421 /// 422 /// Note: This does not perform the implicit conversions required by C++11 423 /// [expr.const]p5. 424 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 425 SourceLocation *Loc = 0, 426 bool isEvaluated = true) const; 427 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const; 428 429 /// isCXX98IntegralConstantExpr - Return true if this expression is an 430 /// integral constant expression in C++98. Can only be used in C++. 431 bool isCXX98IntegralConstantExpr(ASTContext &Ctx) const; 432 433 /// isCXX11ConstantExpr - Return true if this expression is a constant 434 /// expression in C++11. Can only be used in C++. 435 /// 436 /// Note: This does not perform the implicit conversions required by C++11 437 /// [expr.const]p5. 438 bool isCXX11ConstantExpr(ASTContext &Ctx, APValue *Result = 0, 439 SourceLocation *Loc = 0) const; 440 441 /// isPotentialConstantExpr - Return true if this function's definition 442 /// might be usable in a constant expression in C++11, if it were marked 443 /// constexpr. Return false if the function can never produce a constant 444 /// expression, along with diagnostics describing why not. 445 static bool isPotentialConstantExpr(const FunctionDecl *FD, 446 llvm::SmallVectorImpl< 447 PartialDiagnosticAt> &Diags); 448 449 /// isConstantInitializer - Returns true if this expression can be emitted to 450 /// IR as a constant, and thus can be used as a constant initializer in C. 451 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 452 453 /// EvalStatus is a struct with detailed info about an evaluation in progress. 454 struct EvalStatus { 455 /// HasSideEffects - Whether the evaluated expression has side effects. 456 /// For example, (f() && 0) can be folded, but it still has side effects. 457 bool HasSideEffects; 458 459 /// Diag - If this is non-null, it will be filled in with a stack of notes 460 /// indicating why evaluation failed (or why it failed to produce a constant 461 /// expression). 462 /// If the expression is unfoldable, the notes will indicate why it's not 463 /// foldable. If the expression is foldable, but not a constant expression, 464 /// the notes will describes why it isn't a constant expression. If the 465 /// expression *is* a constant expression, no notes will be produced. 466 llvm::SmallVectorImpl<PartialDiagnosticAt> *Diag; 467 468 EvalStatus() : HasSideEffects(false), Diag(0) {} 469 470 // hasSideEffects - Return true if the evaluated expression has 471 // side effects. 472 bool hasSideEffects() const { 473 return HasSideEffects; 474 } 475 }; 476 477 /// EvalResult is a struct with detailed info about an evaluated expression. 478 struct EvalResult : EvalStatus { 479 /// Val - This is the value the expression can be folded to. 480 APValue Val; 481 482 // isGlobalLValue - Return true if the evaluated lvalue expression 483 // is global. 484 bool isGlobalLValue() const; 485 }; 486 487 /// EvaluateAsRValue - Return true if this is a constant which we can fold to 488 /// an rvalue using any crazy technique (that has nothing to do with language 489 /// standards) that we want to, even if the expression has side-effects. If 490 /// this function returns true, it returns the folded constant in Result. If 491 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be 492 /// applied. 493 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx) const; 494 495 /// EvaluateAsBooleanCondition - Return true if this is a constant 496 /// which we we can fold and convert to a boolean condition using 497 /// any crazy technique that we want to, even if the expression has 498 /// side-effects. 499 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 500 501 enum SideEffectsKind { SE_NoSideEffects, SE_AllowSideEffects }; 502 503 /// EvaluateAsInt - Return true if this is a constant which we can fold and 504 /// convert to an integer, using any crazy technique that we want to. 505 bool EvaluateAsInt(llvm::APSInt &Result, const ASTContext &Ctx, 506 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const; 507 508 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be 509 /// constant folded without side-effects, but discard the result. 510 bool isEvaluatable(const ASTContext &Ctx) const; 511 512 /// HasSideEffects - This routine returns true for all those expressions 513 /// which must be evaluated each time and must not be optimized away 514 /// or evaluated at compile time. Example is a function call, volatile 515 /// variable read. 516 bool HasSideEffects(const ASTContext &Ctx) const; 517 518 /// \brief Determine whether this expression involves a call to any function 519 /// that is not trivial. 520 bool hasNonTrivialCall(ASTContext &Ctx); 521 522 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded 523 /// integer. This must be called on an expression that constant folds to an 524 /// integer. 525 llvm::APSInt EvaluateKnownConstInt(const ASTContext &Ctx) const; 526 527 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an 528 /// lvalue with link time known address, with no side-effects. 529 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 530 531 /// EvaluateAsInitializer - Evaluate an expression as if it were the 532 /// initializer of the given declaration. Returns true if the initializer 533 /// can be folded to a constant, and produces any relevant notes. In C++11, 534 /// notes will be produced if the expression is not a constant expression. 535 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx, 536 const VarDecl *VD, 537 llvm::SmallVectorImpl<PartialDiagnosticAt> &Notes) const; 538 539 /// \brief Enumeration used to describe the kind of Null pointer constant 540 /// returned from \c isNullPointerConstant(). 541 enum NullPointerConstantKind { 542 /// \brief Expression is not a Null pointer constant. 543 NPCK_NotNull = 0, 544 545 /// \brief Expression is a Null pointer constant built from a zero integer. 546 NPCK_ZeroInteger, 547 548 /// \brief Expression is a C++0X nullptr. 549 NPCK_CXX0X_nullptr, 550 551 /// \brief Expression is a GNU-style __null constant. 552 NPCK_GNUNull 553 }; 554 555 /// \brief Enumeration used to describe how \c isNullPointerConstant() 556 /// should cope with value-dependent expressions. 557 enum NullPointerConstantValueDependence { 558 /// \brief Specifies that the expression should never be value-dependent. 559 NPC_NeverValueDependent = 0, 560 561 /// \brief Specifies that a value-dependent expression of integral or 562 /// dependent type should be considered a null pointer constant. 563 NPC_ValueDependentIsNull, 564 565 /// \brief Specifies that a value-dependent expression should be considered 566 /// to never be a null pointer constant. 567 NPC_ValueDependentIsNotNull 568 }; 569 570 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 571 /// a Null pointer constant. The return value can further distinguish the 572 /// kind of NULL pointer constant that was detected. 573 NullPointerConstantKind isNullPointerConstant( 574 ASTContext &Ctx, 575 NullPointerConstantValueDependence NPC) const; 576 577 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 578 /// write barrier. 579 bool isOBJCGCCandidate(ASTContext &Ctx) const; 580 581 /// \brief Returns true if this expression is a bound member function. 582 bool isBoundMemberFunction(ASTContext &Ctx) const; 583 584 /// \brief Given an expression of bound-member type, find the type 585 /// of the member. Returns null if this is an *overloaded* bound 586 /// member expression. 587 static QualType findBoundMemberType(const Expr *expr); 588 589 /// IgnoreImpCasts - Skip past any implicit casts which might 590 /// surround this expression. Only skips ImplicitCastExprs. 591 Expr *IgnoreImpCasts() LLVM_READONLY; 592 593 /// IgnoreImplicit - Skip past any implicit AST nodes which might 594 /// surround this expression. 595 Expr *IgnoreImplicit() LLVM_READONLY { 596 return cast<Expr>(Stmt::IgnoreImplicit()); 597 } 598 599 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 600 /// its subexpression. If that subexpression is also a ParenExpr, 601 /// then this method recursively returns its subexpression, and so forth. 602 /// Otherwise, the method returns the current Expr. 603 Expr *IgnoreParens() LLVM_READONLY; 604 605 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 606 /// or CastExprs, returning their operand. 607 Expr *IgnoreParenCasts() LLVM_READONLY; 608 609 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off 610 /// any ParenExpr or ImplicitCastExprs, returning their operand. 611 Expr *IgnoreParenImpCasts() LLVM_READONLY; 612 613 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 614 /// call to a conversion operator, return the argument. 615 Expr *IgnoreConversionOperator() LLVM_READONLY; 616 617 const Expr *IgnoreConversionOperator() const LLVM_READONLY { 618 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 619 } 620 621 const Expr *IgnoreParenImpCasts() const LLVM_READONLY { 622 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 623 } 624 625 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 626 /// CastExprs that represent lvalue casts, returning their operand. 627 Expr *IgnoreParenLValueCasts() LLVM_READONLY; 628 629 const Expr *IgnoreParenLValueCasts() const LLVM_READONLY { 630 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 631 } 632 633 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 634 /// value (including ptr->int casts of the same size). Strip off any 635 /// ParenExpr or CastExprs, returning their operand. 636 Expr *IgnoreParenNoopCasts(ASTContext &Ctx) LLVM_READONLY; 637 638 /// Ignore parentheses and derived-to-base casts. 639 Expr *ignoreParenBaseCasts() LLVM_READONLY; 640 641 const Expr *ignoreParenBaseCasts() const LLVM_READONLY { 642 return const_cast<Expr*>(this)->ignoreParenBaseCasts(); 643 } 644 645 /// \brief Determine whether this expression is a default function argument. 646 /// 647 /// Default arguments are implicitly generated in the abstract syntax tree 648 /// by semantic analysis for function calls, object constructions, etc. in 649 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 650 /// this routine also looks through any implicit casts to determine whether 651 /// the expression is a default argument. 652 bool isDefaultArgument() const; 653 654 /// \brief Determine whether the result of this expression is a 655 /// temporary object of the given class type. 656 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 657 658 /// \brief Whether this expression is an implicit reference to 'this' in C++. 659 bool isImplicitCXXThis() const; 660 661 const Expr *IgnoreImpCasts() const LLVM_READONLY { 662 return const_cast<Expr*>(this)->IgnoreImpCasts(); 663 } 664 const Expr *IgnoreParens() const LLVM_READONLY { 665 return const_cast<Expr*>(this)->IgnoreParens(); 666 } 667 const Expr *IgnoreParenCasts() const LLVM_READONLY { 668 return const_cast<Expr*>(this)->IgnoreParenCasts(); 669 } 670 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const LLVM_READONLY { 671 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 672 } 673 674 static bool hasAnyTypeDependentArguments(llvm::ArrayRef<Expr *> Exprs); 675 676 /// \brief For an expression of class type or pointer to class type, 677 /// return the most derived class decl the expression is known to refer to. 678 /// 679 /// If this expression is a cast, this method looks through it to find the 680 /// most derived decl that can be inferred from the expression. 681 /// This is valid because derived-to-base conversions have undefined 682 /// behavior if the object isn't dynamically of the derived type. 683 const CXXRecordDecl *getBestDynamicClassType() const; 684 685 static bool classof(const Stmt *T) { 686 return T->getStmtClass() >= firstExprConstant && 687 T->getStmtClass() <= lastExprConstant; 688 } 689 static bool classof(const Expr *) { return true; } 690}; 691 692 693//===----------------------------------------------------------------------===// 694// Primary Expressions. 695//===----------------------------------------------------------------------===// 696 697/// OpaqueValueExpr - An expression referring to an opaque object of a 698/// fixed type and value class. These don't correspond to concrete 699/// syntax; instead they're used to express operations (usually copy 700/// operations) on values whose source is generally obvious from 701/// context. 702class OpaqueValueExpr : public Expr { 703 friend class ASTStmtReader; 704 Expr *SourceExpr; 705 SourceLocation Loc; 706 707public: 708 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 709 ExprObjectKind OK = OK_Ordinary, 710 Expr *SourceExpr = 0) 711 : Expr(OpaqueValueExprClass, T, VK, OK, 712 T->isDependentType(), 713 T->isDependentType() || 714 (SourceExpr && SourceExpr->isValueDependent()), 715 T->isInstantiationDependentType(), 716 false), 717 SourceExpr(SourceExpr), Loc(Loc) { 718 } 719 720 /// Given an expression which invokes a copy constructor --- i.e. a 721 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 722 /// find the OpaqueValueExpr that's the source of the construction. 723 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 724 725 explicit OpaqueValueExpr(EmptyShell Empty) 726 : Expr(OpaqueValueExprClass, Empty) { } 727 728 /// \brief Retrieve the location of this expression. 729 SourceLocation getLocation() const { return Loc; } 730 731 SourceRange getSourceRange() const LLVM_READONLY { 732 if (SourceExpr) return SourceExpr->getSourceRange(); 733 return Loc; 734 } 735 SourceLocation getExprLoc() const LLVM_READONLY { 736 if (SourceExpr) return SourceExpr->getExprLoc(); 737 return Loc; 738 } 739 740 child_range children() { return child_range(); } 741 742 /// The source expression of an opaque value expression is the 743 /// expression which originally generated the value. This is 744 /// provided as a convenience for analyses that don't wish to 745 /// precisely model the execution behavior of the program. 746 /// 747 /// The source expression is typically set when building the 748 /// expression which binds the opaque value expression in the first 749 /// place. 750 Expr *getSourceExpr() const { return SourceExpr; } 751 752 static bool classof(const Stmt *T) { 753 return T->getStmtClass() == OpaqueValueExprClass; 754 } 755 static bool classof(const OpaqueValueExpr *) { return true; } 756}; 757 758/// \brief A reference to a declared variable, function, enum, etc. 759/// [C99 6.5.1p2] 760/// 761/// This encodes all the information about how a declaration is referenced 762/// within an expression. 763/// 764/// There are several optional constructs attached to DeclRefExprs only when 765/// they apply in order to conserve memory. These are laid out past the end of 766/// the object, and flags in the DeclRefExprBitfield track whether they exist: 767/// 768/// DeclRefExprBits.HasQualifier: 769/// Specifies when this declaration reference expression has a C++ 770/// nested-name-specifier. 771/// DeclRefExprBits.HasFoundDecl: 772/// Specifies when this declaration reference expression has a record of 773/// a NamedDecl (different from the referenced ValueDecl) which was found 774/// during name lookup and/or overload resolution. 775/// DeclRefExprBits.HasTemplateKWAndArgsInfo: 776/// Specifies when this declaration reference expression has an explicit 777/// C++ template keyword and/or template argument list. 778/// DeclRefExprBits.RefersToEnclosingLocal 779/// Specifies when this declaration reference expression (validly) 780/// refers to a local variable from a different function. 781class DeclRefExpr : public Expr { 782 /// \brief The declaration that we are referencing. 783 ValueDecl *D; 784 785 /// \brief The location of the declaration name itself. 786 SourceLocation Loc; 787 788 /// \brief Provides source/type location info for the declaration name 789 /// embedded in D. 790 DeclarationNameLoc DNLoc; 791 792 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 793 NestedNameSpecifierLoc &getInternalQualifierLoc() { 794 assert(hasQualifier()); 795 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 796 } 797 798 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 799 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 800 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 801 } 802 803 /// \brief Test whether there is a distinct FoundDecl attached to the end of 804 /// this DRE. 805 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 806 807 /// \brief Helper to retrieve the optional NamedDecl through which this 808 /// reference occured. 809 NamedDecl *&getInternalFoundDecl() { 810 assert(hasFoundDecl()); 811 if (hasQualifier()) 812 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 813 return *reinterpret_cast<NamedDecl **>(this + 1); 814 } 815 816 /// \brief Helper to retrieve the optional NamedDecl through which this 817 /// reference occured. 818 NamedDecl *getInternalFoundDecl() const { 819 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 820 } 821 822 DeclRefExpr(ASTContext &Ctx, 823 NestedNameSpecifierLoc QualifierLoc, 824 SourceLocation TemplateKWLoc, 825 ValueDecl *D, bool refersToEnclosingLocal, 826 const DeclarationNameInfo &NameInfo, 827 NamedDecl *FoundD, 828 const TemplateArgumentListInfo *TemplateArgs, 829 QualType T, ExprValueKind VK); 830 831 /// \brief Construct an empty declaration reference expression. 832 explicit DeclRefExpr(EmptyShell Empty) 833 : Expr(DeclRefExprClass, Empty) { } 834 835 /// \brief Computes the type- and value-dependence flags for this 836 /// declaration reference expression. 837 void computeDependence(ASTContext &C); 838 839public: 840 DeclRefExpr(ValueDecl *D, bool refersToEnclosingLocal, QualType T, 841 ExprValueKind VK, SourceLocation L, 842 const DeclarationNameLoc &LocInfo = DeclarationNameLoc()) 843 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false, false), 844 D(D), Loc(L), DNLoc(LocInfo) { 845 DeclRefExprBits.HasQualifier = 0; 846 DeclRefExprBits.HasTemplateKWAndArgsInfo = 0; 847 DeclRefExprBits.HasFoundDecl = 0; 848 DeclRefExprBits.HadMultipleCandidates = 0; 849 DeclRefExprBits.RefersToEnclosingLocal = refersToEnclosingLocal; 850 computeDependence(D->getASTContext()); 851 } 852 853 static DeclRefExpr *Create(ASTContext &Context, 854 NestedNameSpecifierLoc QualifierLoc, 855 SourceLocation TemplateKWLoc, 856 ValueDecl *D, 857 bool isEnclosingLocal, 858 SourceLocation NameLoc, 859 QualType T, ExprValueKind VK, 860 NamedDecl *FoundD = 0, 861 const TemplateArgumentListInfo *TemplateArgs = 0); 862 863 static DeclRefExpr *Create(ASTContext &Context, 864 NestedNameSpecifierLoc QualifierLoc, 865 SourceLocation TemplateKWLoc, 866 ValueDecl *D, 867 bool isEnclosingLocal, 868 const DeclarationNameInfo &NameInfo, 869 QualType T, ExprValueKind VK, 870 NamedDecl *FoundD = 0, 871 const TemplateArgumentListInfo *TemplateArgs = 0); 872 873 /// \brief Construct an empty declaration reference expression. 874 static DeclRefExpr *CreateEmpty(ASTContext &Context, 875 bool HasQualifier, 876 bool HasFoundDecl, 877 bool HasTemplateKWAndArgsInfo, 878 unsigned NumTemplateArgs); 879 880 ValueDecl *getDecl() { return D; } 881 const ValueDecl *getDecl() const { return D; } 882 void setDecl(ValueDecl *NewD) { D = NewD; } 883 884 DeclarationNameInfo getNameInfo() const { 885 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 886 } 887 888 SourceLocation getLocation() const { return Loc; } 889 void setLocation(SourceLocation L) { Loc = L; } 890 SourceRange getSourceRange() const LLVM_READONLY; 891 SourceLocation getLocStart() const LLVM_READONLY; 892 SourceLocation getLocEnd() const LLVM_READONLY; 893 894 /// \brief Determine whether this declaration reference was preceded by a 895 /// C++ nested-name-specifier, e.g., \c N::foo. 896 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 897 898 /// \brief If the name was qualified, retrieves the nested-name-specifier 899 /// that precedes the name. Otherwise, returns NULL. 900 NestedNameSpecifier *getQualifier() const { 901 if (!hasQualifier()) 902 return 0; 903 904 return getInternalQualifierLoc().getNestedNameSpecifier(); 905 } 906 907 /// \brief If the name was qualified, retrieves the nested-name-specifier 908 /// that precedes the name, with source-location information. 909 NestedNameSpecifierLoc getQualifierLoc() const { 910 if (!hasQualifier()) 911 return NestedNameSpecifierLoc(); 912 913 return getInternalQualifierLoc(); 914 } 915 916 /// \brief Get the NamedDecl through which this reference occured. 917 /// 918 /// This Decl may be different from the ValueDecl actually referred to in the 919 /// presence of using declarations, etc. It always returns non-NULL, and may 920 /// simple return the ValueDecl when appropriate. 921 NamedDecl *getFoundDecl() { 922 return hasFoundDecl() ? getInternalFoundDecl() : D; 923 } 924 925 /// \brief Get the NamedDecl through which this reference occurred. 926 /// See non-const variant. 927 const NamedDecl *getFoundDecl() const { 928 return hasFoundDecl() ? getInternalFoundDecl() : D; 929 } 930 931 bool hasTemplateKWAndArgsInfo() const { 932 return DeclRefExprBits.HasTemplateKWAndArgsInfo; 933 } 934 935 /// \brief Return the optional template keyword and arguments info. 936 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 937 if (!hasTemplateKWAndArgsInfo()) 938 return 0; 939 940 if (hasFoundDecl()) 941 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 942 &getInternalFoundDecl() + 1); 943 944 if (hasQualifier()) 945 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 946 &getInternalQualifierLoc() + 1); 947 948 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 949 } 950 951 /// \brief Return the optional template keyword and arguments info. 952 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 953 return const_cast<DeclRefExpr*>(this)->getTemplateKWAndArgsInfo(); 954 } 955 956 /// \brief Retrieve the location of the template keyword preceding 957 /// this name, if any. 958 SourceLocation getTemplateKeywordLoc() const { 959 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 960 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 961 } 962 963 /// \brief Retrieve the location of the left angle bracket starting the 964 /// explicit template argument list following the name, if any. 965 SourceLocation getLAngleLoc() const { 966 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 967 return getTemplateKWAndArgsInfo()->LAngleLoc; 968 } 969 970 /// \brief Retrieve the location of the right angle bracket ending the 971 /// explicit template argument list following the name, if any. 972 SourceLocation getRAngleLoc() const { 973 if (!hasTemplateKWAndArgsInfo()) return SourceLocation(); 974 return getTemplateKWAndArgsInfo()->RAngleLoc; 975 } 976 977 /// \brief Determines whether the name in this declaration reference 978 /// was preceded by the template keyword. 979 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 980 981 /// \brief Determines whether this declaration reference was followed by an 982 /// explicit template argument list. 983 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 984 985 /// \brief Retrieve the explicit template argument list that followed the 986 /// member template name. 987 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 988 assert(hasExplicitTemplateArgs()); 989 return *getTemplateKWAndArgsInfo(); 990 } 991 992 /// \brief Retrieve the explicit template argument list that followed the 993 /// member template name. 994 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 995 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 996 } 997 998 /// \brief Retrieves the optional explicit template arguments. 999 /// This points to the same data as getExplicitTemplateArgs(), but 1000 /// returns null if there are no explicit template arguments. 1001 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 1002 if (!hasExplicitTemplateArgs()) return 0; 1003 return &getExplicitTemplateArgs(); 1004 } 1005 1006 /// \brief Copies the template arguments (if present) into the given 1007 /// structure. 1008 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1009 if (hasExplicitTemplateArgs()) 1010 getExplicitTemplateArgs().copyInto(List); 1011 } 1012 1013 /// \brief Retrieve the template arguments provided as part of this 1014 /// template-id. 1015 const TemplateArgumentLoc *getTemplateArgs() const { 1016 if (!hasExplicitTemplateArgs()) 1017 return 0; 1018 1019 return getExplicitTemplateArgs().getTemplateArgs(); 1020 } 1021 1022 /// \brief Retrieve the number of template arguments provided as part of this 1023 /// template-id. 1024 unsigned getNumTemplateArgs() const { 1025 if (!hasExplicitTemplateArgs()) 1026 return 0; 1027 1028 return getExplicitTemplateArgs().NumTemplateArgs; 1029 } 1030 1031 /// \brief Returns true if this expression refers to a function that 1032 /// was resolved from an overloaded set having size greater than 1. 1033 bool hadMultipleCandidates() const { 1034 return DeclRefExprBits.HadMultipleCandidates; 1035 } 1036 /// \brief Sets the flag telling whether this expression refers to 1037 /// a function that was resolved from an overloaded set having size 1038 /// greater than 1. 1039 void setHadMultipleCandidates(bool V = true) { 1040 DeclRefExprBits.HadMultipleCandidates = V; 1041 } 1042 1043 /// Does this DeclRefExpr refer to a local declaration from an 1044 /// enclosing function scope? 1045 bool refersToEnclosingLocal() const { 1046 return DeclRefExprBits.RefersToEnclosingLocal; 1047 } 1048 1049 static bool classof(const Stmt *T) { 1050 return T->getStmtClass() == DeclRefExprClass; 1051 } 1052 static bool classof(const DeclRefExpr *) { return true; } 1053 1054 // Iterators 1055 child_range children() { return child_range(); } 1056 1057 friend class ASTStmtReader; 1058 friend class ASTStmtWriter; 1059}; 1060 1061/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 1062class PredefinedExpr : public Expr { 1063public: 1064 enum IdentType { 1065 Func, 1066 Function, 1067 LFunction, // Same as Function, but as wide string. 1068 PrettyFunction, 1069 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 1070 /// 'virtual' keyword is omitted for virtual member functions. 1071 PrettyFunctionNoVirtual 1072 }; 1073 1074private: 1075 SourceLocation Loc; 1076 IdentType Type; 1077public: 1078 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 1079 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 1080 type->isDependentType(), type->isDependentType(), 1081 type->isInstantiationDependentType(), 1082 /*ContainsUnexpandedParameterPack=*/false), 1083 Loc(l), Type(IT) {} 1084 1085 /// \brief Construct an empty predefined expression. 1086 explicit PredefinedExpr(EmptyShell Empty) 1087 : Expr(PredefinedExprClass, Empty) { } 1088 1089 IdentType getIdentType() const { return Type; } 1090 void setIdentType(IdentType IT) { Type = IT; } 1091 1092 SourceLocation getLocation() const { return Loc; } 1093 void setLocation(SourceLocation L) { Loc = L; } 1094 1095 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 1096 1097 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1098 1099 static bool classof(const Stmt *T) { 1100 return T->getStmtClass() == PredefinedExprClass; 1101 } 1102 static bool classof(const PredefinedExpr *) { return true; } 1103 1104 // Iterators 1105 child_range children() { return child_range(); } 1106}; 1107 1108/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 1109/// leaking memory. 1110/// 1111/// For large floats/integers, APFloat/APInt will allocate memory from the heap 1112/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 1113/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 1114/// the APFloat/APInt values will never get freed. APNumericStorage uses 1115/// ASTContext's allocator for memory allocation. 1116class APNumericStorage { 1117 union { 1118 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 1119 uint64_t *pVal; ///< Used to store the >64 bits integer value. 1120 }; 1121 unsigned BitWidth; 1122 1123 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 1124 1125 APNumericStorage(const APNumericStorage&); // do not implement 1126 APNumericStorage& operator=(const APNumericStorage&); // do not implement 1127 1128protected: 1129 APNumericStorage() : VAL(0), BitWidth(0) { } 1130 1131 llvm::APInt getIntValue() const { 1132 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 1133 if (NumWords > 1) 1134 return llvm::APInt(BitWidth, NumWords, pVal); 1135 else 1136 return llvm::APInt(BitWidth, VAL); 1137 } 1138 void setIntValue(ASTContext &C, const llvm::APInt &Val); 1139}; 1140 1141class APIntStorage : private APNumericStorage { 1142public: 1143 llvm::APInt getValue() const { return getIntValue(); } 1144 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1145}; 1146 1147class APFloatStorage : private APNumericStorage { 1148public: 1149 llvm::APFloat getValue(bool IsIEEE) const { 1150 return llvm::APFloat(getIntValue(), IsIEEE); 1151 } 1152 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1153 setIntValue(C, Val.bitcastToAPInt()); 1154 } 1155}; 1156 1157class IntegerLiteral : public Expr, public APIntStorage { 1158 SourceLocation Loc; 1159 1160 /// \brief Construct an empty integer literal. 1161 explicit IntegerLiteral(EmptyShell Empty) 1162 : Expr(IntegerLiteralClass, Empty) { } 1163 1164public: 1165 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1166 // or UnsignedLongLongTy 1167 IntegerLiteral(ASTContext &C, const llvm::APInt &V, QualType type, 1168 SourceLocation l); 1169 1170 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1171 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1172 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1173 /// \param V - the value that the returned integer literal contains. 1174 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1175 QualType type, SourceLocation l); 1176 /// \brief Returns a new empty integer literal. 1177 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1178 1179 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1180 1181 /// \brief Retrieve the location of the literal. 1182 SourceLocation getLocation() const { return Loc; } 1183 1184 void setLocation(SourceLocation Location) { Loc = Location; } 1185 1186 static bool classof(const Stmt *T) { 1187 return T->getStmtClass() == IntegerLiteralClass; 1188 } 1189 static bool classof(const IntegerLiteral *) { return true; } 1190 1191 // Iterators 1192 child_range children() { return child_range(); } 1193}; 1194 1195class CharacterLiteral : public Expr { 1196public: 1197 enum CharacterKind { 1198 Ascii, 1199 Wide, 1200 UTF16, 1201 UTF32 1202 }; 1203 1204private: 1205 unsigned Value; 1206 SourceLocation Loc; 1207public: 1208 // type should be IntTy 1209 CharacterLiteral(unsigned value, CharacterKind kind, QualType type, 1210 SourceLocation l) 1211 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1212 false, false), 1213 Value(value), Loc(l) { 1214 CharacterLiteralBits.Kind = kind; 1215 } 1216 1217 /// \brief Construct an empty character literal. 1218 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1219 1220 SourceLocation getLocation() const { return Loc; } 1221 CharacterKind getKind() const { 1222 return static_cast<CharacterKind>(CharacterLiteralBits.Kind); 1223 } 1224 1225 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1226 1227 unsigned getValue() const { return Value; } 1228 1229 void setLocation(SourceLocation Location) { Loc = Location; } 1230 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; } 1231 void setValue(unsigned Val) { Value = Val; } 1232 1233 static bool classof(const Stmt *T) { 1234 return T->getStmtClass() == CharacterLiteralClass; 1235 } 1236 static bool classof(const CharacterLiteral *) { return true; } 1237 1238 // Iterators 1239 child_range children() { return child_range(); } 1240}; 1241 1242class FloatingLiteral : public Expr, private APFloatStorage { 1243 SourceLocation Loc; 1244 1245 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1246 QualType Type, SourceLocation L); 1247 1248 /// \brief Construct an empty floating-point literal. 1249 explicit FloatingLiteral(ASTContext &C, EmptyShell Empty); 1250 1251public: 1252 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1253 bool isexact, QualType Type, SourceLocation L); 1254 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1255 1256 llvm::APFloat getValue() const { 1257 return APFloatStorage::getValue(FloatingLiteralBits.IsIEEE); 1258 } 1259 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1260 APFloatStorage::setValue(C, Val); 1261 } 1262 1263 bool isExact() const { return FloatingLiteralBits.IsExact; } 1264 void setExact(bool E) { FloatingLiteralBits.IsExact = E; } 1265 1266 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1267 /// double. Note that this may cause loss of precision, but is useful for 1268 /// debugging dumps, etc. 1269 double getValueAsApproximateDouble() const; 1270 1271 SourceLocation getLocation() const { return Loc; } 1272 void setLocation(SourceLocation L) { Loc = L; } 1273 1274 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(Loc); } 1275 1276 static bool classof(const Stmt *T) { 1277 return T->getStmtClass() == FloatingLiteralClass; 1278 } 1279 static bool classof(const FloatingLiteral *) { return true; } 1280 1281 // Iterators 1282 child_range children() { return child_range(); } 1283}; 1284 1285/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1286/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1287/// IntegerLiteral classes. Instances of this class always have a Complex type 1288/// whose element type matches the subexpression. 1289/// 1290class ImaginaryLiteral : public Expr { 1291 Stmt *Val; 1292public: 1293 ImaginaryLiteral(Expr *val, QualType Ty) 1294 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1295 false, false), 1296 Val(val) {} 1297 1298 /// \brief Build an empty imaginary literal. 1299 explicit ImaginaryLiteral(EmptyShell Empty) 1300 : Expr(ImaginaryLiteralClass, Empty) { } 1301 1302 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1303 Expr *getSubExpr() { return cast<Expr>(Val); } 1304 void setSubExpr(Expr *E) { Val = E; } 1305 1306 SourceRange getSourceRange() const LLVM_READONLY { return Val->getSourceRange(); } 1307 static bool classof(const Stmt *T) { 1308 return T->getStmtClass() == ImaginaryLiteralClass; 1309 } 1310 static bool classof(const ImaginaryLiteral *) { return true; } 1311 1312 // Iterators 1313 child_range children() { return child_range(&Val, &Val+1); } 1314}; 1315 1316/// StringLiteral - This represents a string literal expression, e.g. "foo" 1317/// or L"bar" (wide strings). The actual string is returned by getStrData() 1318/// is NOT null-terminated, and the length of the string is determined by 1319/// calling getByteLength(). The C type for a string is always a 1320/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1321/// not. 1322/// 1323/// Note that strings in C can be formed by concatenation of multiple string 1324/// literal pptokens in translation phase #6. This keeps track of the locations 1325/// of each of these pieces. 1326/// 1327/// Strings in C can also be truncated and extended by assigning into arrays, 1328/// e.g. with constructs like: 1329/// char X[2] = "foobar"; 1330/// In this case, getByteLength() will return 6, but the string literal will 1331/// have type "char[2]". 1332class StringLiteral : public Expr { 1333public: 1334 enum StringKind { 1335 Ascii, 1336 Wide, 1337 UTF8, 1338 UTF16, 1339 UTF32 1340 }; 1341 1342private: 1343 friend class ASTStmtReader; 1344 1345 union { 1346 const char *asChar; 1347 const uint16_t *asUInt16; 1348 const uint32_t *asUInt32; 1349 } StrData; 1350 unsigned Length; 1351 unsigned CharByteWidth : 4; 1352 unsigned Kind : 3; 1353 unsigned IsPascal : 1; 1354 unsigned NumConcatenated; 1355 SourceLocation TokLocs[1]; 1356 1357 StringLiteral(QualType Ty) : 1358 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false, 1359 false) {} 1360 1361 static int mapCharByteWidth(TargetInfo const &target,StringKind k); 1362 1363public: 1364 /// This is the "fully general" constructor that allows representation of 1365 /// strings formed from multiple concatenated tokens. 1366 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1367 bool Pascal, QualType Ty, 1368 const SourceLocation *Loc, unsigned NumStrs); 1369 1370 /// Simple constructor for string literals made from one token. 1371 static StringLiteral *Create(ASTContext &C, StringRef Str, StringKind Kind, 1372 bool Pascal, QualType Ty, 1373 SourceLocation Loc) { 1374 return Create(C, Str, Kind, Pascal, Ty, &Loc, 1); 1375 } 1376 1377 /// \brief Construct an empty string literal. 1378 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1379 1380 StringRef getString() const { 1381 assert(CharByteWidth==1 1382 && "This function is used in places that assume strings use char"); 1383 return StringRef(StrData.asChar, getByteLength()); 1384 } 1385 1386 /// Allow access to clients that need the byte representation, such as 1387 /// ASTWriterStmt::VisitStringLiteral(). 1388 StringRef getBytes() const { 1389 // FIXME: StringRef may not be the right type to use as a result for this. 1390 if (CharByteWidth == 1) 1391 return StringRef(StrData.asChar, getByteLength()); 1392 if (CharByteWidth == 4) 1393 return StringRef(reinterpret_cast<const char*>(StrData.asUInt32), 1394 getByteLength()); 1395 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1396 return StringRef(reinterpret_cast<const char*>(StrData.asUInt16), 1397 getByteLength()); 1398 } 1399 1400 void outputString(raw_ostream &OS); 1401 1402 uint32_t getCodeUnit(size_t i) const { 1403 assert(i < Length && "out of bounds access"); 1404 if (CharByteWidth == 1) 1405 return static_cast<unsigned char>(StrData.asChar[i]); 1406 if (CharByteWidth == 4) 1407 return StrData.asUInt32[i]; 1408 assert(CharByteWidth == 2 && "unsupported CharByteWidth"); 1409 return StrData.asUInt16[i]; 1410 } 1411 1412 unsigned getByteLength() const { return CharByteWidth*Length; } 1413 unsigned getLength() const { return Length; } 1414 unsigned getCharByteWidth() const { return CharByteWidth; } 1415 1416 /// \brief Sets the string data to the given string data. 1417 void setString(ASTContext &C, StringRef Str, 1418 StringKind Kind, bool IsPascal); 1419 1420 StringKind getKind() const { return static_cast<StringKind>(Kind); } 1421 1422 1423 bool isAscii() const { return Kind == Ascii; } 1424 bool isWide() const { return Kind == Wide; } 1425 bool isUTF8() const { return Kind == UTF8; } 1426 bool isUTF16() const { return Kind == UTF16; } 1427 bool isUTF32() const { return Kind == UTF32; } 1428 bool isPascal() const { return IsPascal; } 1429 1430 bool containsNonAsciiOrNull() const { 1431 StringRef Str = getString(); 1432 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1433 if (!isascii(Str[i]) || !Str[i]) 1434 return true; 1435 return false; 1436 } 1437 1438 /// getNumConcatenated - Get the number of string literal tokens that were 1439 /// concatenated in translation phase #6 to form this string literal. 1440 unsigned getNumConcatenated() const { return NumConcatenated; } 1441 1442 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1443 assert(TokNum < NumConcatenated && "Invalid tok number"); 1444 return TokLocs[TokNum]; 1445 } 1446 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1447 assert(TokNum < NumConcatenated && "Invalid tok number"); 1448 TokLocs[TokNum] = L; 1449 } 1450 1451 /// getLocationOfByte - Return a source location that points to the specified 1452 /// byte of this string literal. 1453 /// 1454 /// Strings are amazingly complex. They can be formed from multiple tokens 1455 /// and can have escape sequences in them in addition to the usual trigraph 1456 /// and escaped newline business. This routine handles this complexity. 1457 /// 1458 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1459 const LangOptions &Features, 1460 const TargetInfo &Target) const; 1461 1462 typedef const SourceLocation *tokloc_iterator; 1463 tokloc_iterator tokloc_begin() const { return TokLocs; } 1464 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1465 1466 SourceRange getSourceRange() const LLVM_READONLY { 1467 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1468 } 1469 static bool classof(const Stmt *T) { 1470 return T->getStmtClass() == StringLiteralClass; 1471 } 1472 static bool classof(const StringLiteral *) { return true; } 1473 1474 // Iterators 1475 child_range children() { return child_range(); } 1476}; 1477 1478/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1479/// AST node is only formed if full location information is requested. 1480class ParenExpr : public Expr { 1481 SourceLocation L, R; 1482 Stmt *Val; 1483public: 1484 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1485 : Expr(ParenExprClass, val->getType(), 1486 val->getValueKind(), val->getObjectKind(), 1487 val->isTypeDependent(), val->isValueDependent(), 1488 val->isInstantiationDependent(), 1489 val->containsUnexpandedParameterPack()), 1490 L(l), R(r), Val(val) {} 1491 1492 /// \brief Construct an empty parenthesized expression. 1493 explicit ParenExpr(EmptyShell Empty) 1494 : Expr(ParenExprClass, Empty) { } 1495 1496 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1497 Expr *getSubExpr() { return cast<Expr>(Val); } 1498 void setSubExpr(Expr *E) { Val = E; } 1499 1500 SourceRange getSourceRange() const LLVM_READONLY { return SourceRange(L, R); } 1501 1502 /// \brief Get the location of the left parentheses '('. 1503 SourceLocation getLParen() const { return L; } 1504 void setLParen(SourceLocation Loc) { L = Loc; } 1505 1506 /// \brief Get the location of the right parentheses ')'. 1507 SourceLocation getRParen() const { return R; } 1508 void setRParen(SourceLocation Loc) { R = Loc; } 1509 1510 static bool classof(const Stmt *T) { 1511 return T->getStmtClass() == ParenExprClass; 1512 } 1513 static bool classof(const ParenExpr *) { return true; } 1514 1515 // Iterators 1516 child_range children() { return child_range(&Val, &Val+1); } 1517}; 1518 1519 1520/// UnaryOperator - This represents the unary-expression's (except sizeof and 1521/// alignof), the postinc/postdec operators from postfix-expression, and various 1522/// extensions. 1523/// 1524/// Notes on various nodes: 1525/// 1526/// Real/Imag - These return the real/imag part of a complex operand. If 1527/// applied to a non-complex value, the former returns its operand and the 1528/// later returns zero in the type of the operand. 1529/// 1530class UnaryOperator : public Expr { 1531public: 1532 typedef UnaryOperatorKind Opcode; 1533 1534private: 1535 unsigned Opc : 5; 1536 SourceLocation Loc; 1537 Stmt *Val; 1538public: 1539 1540 UnaryOperator(Expr *input, Opcode opc, QualType type, 1541 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1542 : Expr(UnaryOperatorClass, type, VK, OK, 1543 input->isTypeDependent() || type->isDependentType(), 1544 input->isValueDependent(), 1545 (input->isInstantiationDependent() || 1546 type->isInstantiationDependentType()), 1547 input->containsUnexpandedParameterPack()), 1548 Opc(opc), Loc(l), Val(input) {} 1549 1550 /// \brief Build an empty unary operator. 1551 explicit UnaryOperator(EmptyShell Empty) 1552 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1553 1554 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1555 void setOpcode(Opcode O) { Opc = O; } 1556 1557 Expr *getSubExpr() const { return cast<Expr>(Val); } 1558 void setSubExpr(Expr *E) { Val = E; } 1559 1560 /// getOperatorLoc - Return the location of the operator. 1561 SourceLocation getOperatorLoc() const { return Loc; } 1562 void setOperatorLoc(SourceLocation L) { Loc = L; } 1563 1564 /// isPostfix - Return true if this is a postfix operation, like x++. 1565 static bool isPostfix(Opcode Op) { 1566 return Op == UO_PostInc || Op == UO_PostDec; 1567 } 1568 1569 /// isPrefix - Return true if this is a prefix operation, like --x. 1570 static bool isPrefix(Opcode Op) { 1571 return Op == UO_PreInc || Op == UO_PreDec; 1572 } 1573 1574 bool isPrefix() const { return isPrefix(getOpcode()); } 1575 bool isPostfix() const { return isPostfix(getOpcode()); } 1576 1577 static bool isIncrementOp(Opcode Op) { 1578 return Op == UO_PreInc || Op == UO_PostInc; 1579 } 1580 bool isIncrementOp() const { 1581 return isIncrementOp(getOpcode()); 1582 } 1583 1584 static bool isDecrementOp(Opcode Op) { 1585 return Op == UO_PreDec || Op == UO_PostDec; 1586 } 1587 bool isDecrementOp() const { 1588 return isDecrementOp(getOpcode()); 1589 } 1590 1591 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; } 1592 bool isIncrementDecrementOp() const { 1593 return isIncrementDecrementOp(getOpcode()); 1594 } 1595 1596 static bool isArithmeticOp(Opcode Op) { 1597 return Op >= UO_Plus && Op <= UO_LNot; 1598 } 1599 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1600 1601 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1602 /// corresponds to, e.g. "sizeof" or "[pre]++" 1603 static const char *getOpcodeStr(Opcode Op); 1604 1605 /// \brief Retrieve the unary opcode that corresponds to the given 1606 /// overloaded operator. 1607 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1608 1609 /// \brief Retrieve the overloaded operator kind that corresponds to 1610 /// the given unary opcode. 1611 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1612 1613 SourceRange getSourceRange() const LLVM_READONLY { 1614 if (isPostfix()) 1615 return SourceRange(Val->getLocStart(), Loc); 1616 else 1617 return SourceRange(Loc, Val->getLocEnd()); 1618 } 1619 SourceLocation getExprLoc() const LLVM_READONLY { return Loc; } 1620 1621 static bool classof(const Stmt *T) { 1622 return T->getStmtClass() == UnaryOperatorClass; 1623 } 1624 static bool classof(const UnaryOperator *) { return true; } 1625 1626 // Iterators 1627 child_range children() { return child_range(&Val, &Val+1); } 1628}; 1629 1630/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1631/// offsetof(record-type, member-designator). For example, given: 1632/// @code 1633/// struct S { 1634/// float f; 1635/// double d; 1636/// }; 1637/// struct T { 1638/// int i; 1639/// struct S s[10]; 1640/// }; 1641/// @endcode 1642/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1643 1644class OffsetOfExpr : public Expr { 1645public: 1646 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1647 class OffsetOfNode { 1648 public: 1649 /// \brief The kind of offsetof node we have. 1650 enum Kind { 1651 /// \brief An index into an array. 1652 Array = 0x00, 1653 /// \brief A field. 1654 Field = 0x01, 1655 /// \brief A field in a dependent type, known only by its name. 1656 Identifier = 0x02, 1657 /// \brief An implicit indirection through a C++ base class, when the 1658 /// field found is in a base class. 1659 Base = 0x03 1660 }; 1661 1662 private: 1663 enum { MaskBits = 2, Mask = 0x03 }; 1664 1665 /// \brief The source range that covers this part of the designator. 1666 SourceRange Range; 1667 1668 /// \brief The data describing the designator, which comes in three 1669 /// different forms, depending on the lower two bits. 1670 /// - An unsigned index into the array of Expr*'s stored after this node 1671 /// in memory, for [constant-expression] designators. 1672 /// - A FieldDecl*, for references to a known field. 1673 /// - An IdentifierInfo*, for references to a field with a given name 1674 /// when the class type is dependent. 1675 /// - A CXXBaseSpecifier*, for references that look at a field in a 1676 /// base class. 1677 uintptr_t Data; 1678 1679 public: 1680 /// \brief Create an offsetof node that refers to an array element. 1681 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1682 SourceLocation RBracketLoc) 1683 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1684 1685 /// \brief Create an offsetof node that refers to a field. 1686 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1687 SourceLocation NameLoc) 1688 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1689 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1690 1691 /// \brief Create an offsetof node that refers to an identifier. 1692 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1693 SourceLocation NameLoc) 1694 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1695 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1696 1697 /// \brief Create an offsetof node that refers into a C++ base class. 1698 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1699 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1700 1701 /// \brief Determine what kind of offsetof node this is. 1702 Kind getKind() const { 1703 return static_cast<Kind>(Data & Mask); 1704 } 1705 1706 /// \brief For an array element node, returns the index into the array 1707 /// of expressions. 1708 unsigned getArrayExprIndex() const { 1709 assert(getKind() == Array); 1710 return Data >> 2; 1711 } 1712 1713 /// \brief For a field offsetof node, returns the field. 1714 FieldDecl *getField() const { 1715 assert(getKind() == Field); 1716 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1717 } 1718 1719 /// \brief For a field or identifier offsetof node, returns the name of 1720 /// the field. 1721 IdentifierInfo *getFieldName() const; 1722 1723 /// \brief For a base class node, returns the base specifier. 1724 CXXBaseSpecifier *getBase() const { 1725 assert(getKind() == Base); 1726 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1727 } 1728 1729 /// \brief Retrieve the source range that covers this offsetof node. 1730 /// 1731 /// For an array element node, the source range contains the locations of 1732 /// the square brackets. For a field or identifier node, the source range 1733 /// contains the location of the period (if there is one) and the 1734 /// identifier. 1735 SourceRange getSourceRange() const LLVM_READONLY { return Range; } 1736 }; 1737 1738private: 1739 1740 SourceLocation OperatorLoc, RParenLoc; 1741 // Base type; 1742 TypeSourceInfo *TSInfo; 1743 // Number of sub-components (i.e. instances of OffsetOfNode). 1744 unsigned NumComps; 1745 // Number of sub-expressions (i.e. array subscript expressions). 1746 unsigned NumExprs; 1747 1748 OffsetOfExpr(ASTContext &C, QualType type, 1749 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1750 OffsetOfNode* compsPtr, unsigned numComps, 1751 Expr** exprsPtr, unsigned numExprs, 1752 SourceLocation RParenLoc); 1753 1754 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1755 : Expr(OffsetOfExprClass, EmptyShell()), 1756 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1757 1758public: 1759 1760 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1761 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1762 OffsetOfNode* compsPtr, unsigned numComps, 1763 Expr** exprsPtr, unsigned numExprs, 1764 SourceLocation RParenLoc); 1765 1766 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1767 unsigned NumComps, unsigned NumExprs); 1768 1769 /// getOperatorLoc - Return the location of the operator. 1770 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1771 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1772 1773 /// \brief Return the location of the right parentheses. 1774 SourceLocation getRParenLoc() const { return RParenLoc; } 1775 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1776 1777 TypeSourceInfo *getTypeSourceInfo() const { 1778 return TSInfo; 1779 } 1780 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1781 TSInfo = tsi; 1782 } 1783 1784 const OffsetOfNode &getComponent(unsigned Idx) const { 1785 assert(Idx < NumComps && "Subscript out of range"); 1786 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1787 } 1788 1789 void setComponent(unsigned Idx, OffsetOfNode ON) { 1790 assert(Idx < NumComps && "Subscript out of range"); 1791 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1792 } 1793 1794 unsigned getNumComponents() const { 1795 return NumComps; 1796 } 1797 1798 Expr* getIndexExpr(unsigned Idx) { 1799 assert(Idx < NumExprs && "Subscript out of range"); 1800 return reinterpret_cast<Expr **>( 1801 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1802 } 1803 const Expr *getIndexExpr(unsigned Idx) const { 1804 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1805 } 1806 1807 void setIndexExpr(unsigned Idx, Expr* E) { 1808 assert(Idx < NumComps && "Subscript out of range"); 1809 reinterpret_cast<Expr **>( 1810 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1811 } 1812 1813 unsigned getNumExpressions() const { 1814 return NumExprs; 1815 } 1816 1817 SourceRange getSourceRange() const LLVM_READONLY { 1818 return SourceRange(OperatorLoc, RParenLoc); 1819 } 1820 1821 static bool classof(const Stmt *T) { 1822 return T->getStmtClass() == OffsetOfExprClass; 1823 } 1824 1825 static bool classof(const OffsetOfExpr *) { return true; } 1826 1827 // Iterators 1828 child_range children() { 1829 Stmt **begin = 1830 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1831 + NumComps); 1832 return child_range(begin, begin + NumExprs); 1833 } 1834}; 1835 1836/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1837/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1838/// vec_step (OpenCL 1.1 6.11.12). 1839class UnaryExprOrTypeTraitExpr : public Expr { 1840 union { 1841 TypeSourceInfo *Ty; 1842 Stmt *Ex; 1843 } Argument; 1844 SourceLocation OpLoc, RParenLoc; 1845 1846public: 1847 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1848 QualType resultType, SourceLocation op, 1849 SourceLocation rp) : 1850 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1851 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1852 // Value-dependent if the argument is type-dependent. 1853 TInfo->getType()->isDependentType(), 1854 TInfo->getType()->isInstantiationDependentType(), 1855 TInfo->getType()->containsUnexpandedParameterPack()), 1856 OpLoc(op), RParenLoc(rp) { 1857 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1858 UnaryExprOrTypeTraitExprBits.IsType = true; 1859 Argument.Ty = TInfo; 1860 } 1861 1862 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1863 QualType resultType, SourceLocation op, 1864 SourceLocation rp) : 1865 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1866 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1867 // Value-dependent if the argument is type-dependent. 1868 E->isTypeDependent(), 1869 E->isInstantiationDependent(), 1870 E->containsUnexpandedParameterPack()), 1871 OpLoc(op), RParenLoc(rp) { 1872 UnaryExprOrTypeTraitExprBits.Kind = ExprKind; 1873 UnaryExprOrTypeTraitExprBits.IsType = false; 1874 Argument.Ex = E; 1875 } 1876 1877 /// \brief Construct an empty sizeof/alignof expression. 1878 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1879 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1880 1881 UnaryExprOrTypeTrait getKind() const { 1882 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind); 1883 } 1884 void setKind(UnaryExprOrTypeTrait K) { UnaryExprOrTypeTraitExprBits.Kind = K;} 1885 1886 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; } 1887 QualType getArgumentType() const { 1888 return getArgumentTypeInfo()->getType(); 1889 } 1890 TypeSourceInfo *getArgumentTypeInfo() const { 1891 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1892 return Argument.Ty; 1893 } 1894 Expr *getArgumentExpr() { 1895 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1896 return static_cast<Expr*>(Argument.Ex); 1897 } 1898 const Expr *getArgumentExpr() const { 1899 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1900 } 1901 1902 void setArgument(Expr *E) { 1903 Argument.Ex = E; 1904 UnaryExprOrTypeTraitExprBits.IsType = false; 1905 } 1906 void setArgument(TypeSourceInfo *TInfo) { 1907 Argument.Ty = TInfo; 1908 UnaryExprOrTypeTraitExprBits.IsType = true; 1909 } 1910 1911 /// Gets the argument type, or the type of the argument expression, whichever 1912 /// is appropriate. 1913 QualType getTypeOfArgument() const { 1914 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1915 } 1916 1917 SourceLocation getOperatorLoc() const { return OpLoc; } 1918 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1919 1920 SourceLocation getRParenLoc() const { return RParenLoc; } 1921 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1922 1923 SourceRange getSourceRange() const LLVM_READONLY { 1924 return SourceRange(OpLoc, RParenLoc); 1925 } 1926 1927 static bool classof(const Stmt *T) { 1928 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1929 } 1930 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1931 1932 // Iterators 1933 child_range children(); 1934}; 1935 1936//===----------------------------------------------------------------------===// 1937// Postfix Operators. 1938//===----------------------------------------------------------------------===// 1939 1940/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1941class ArraySubscriptExpr : public Expr { 1942 enum { LHS, RHS, END_EXPR=2 }; 1943 Stmt* SubExprs[END_EXPR]; 1944 SourceLocation RBracketLoc; 1945public: 1946 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1947 ExprValueKind VK, ExprObjectKind OK, 1948 SourceLocation rbracketloc) 1949 : Expr(ArraySubscriptExprClass, t, VK, OK, 1950 lhs->isTypeDependent() || rhs->isTypeDependent(), 1951 lhs->isValueDependent() || rhs->isValueDependent(), 1952 (lhs->isInstantiationDependent() || 1953 rhs->isInstantiationDependent()), 1954 (lhs->containsUnexpandedParameterPack() || 1955 rhs->containsUnexpandedParameterPack())), 1956 RBracketLoc(rbracketloc) { 1957 SubExprs[LHS] = lhs; 1958 SubExprs[RHS] = rhs; 1959 } 1960 1961 /// \brief Create an empty array subscript expression. 1962 explicit ArraySubscriptExpr(EmptyShell Shell) 1963 : Expr(ArraySubscriptExprClass, Shell) { } 1964 1965 /// An array access can be written A[4] or 4[A] (both are equivalent). 1966 /// - getBase() and getIdx() always present the normalized view: A[4]. 1967 /// In this case getBase() returns "A" and getIdx() returns "4". 1968 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1969 /// 4[A] getLHS() returns "4". 1970 /// Note: Because vector element access is also written A[4] we must 1971 /// predicate the format conversion in getBase and getIdx only on the 1972 /// the type of the RHS, as it is possible for the LHS to be a vector of 1973 /// integer type 1974 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1975 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1976 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1977 1978 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1979 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1980 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1981 1982 Expr *getBase() { 1983 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1984 } 1985 1986 const Expr *getBase() const { 1987 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1988 } 1989 1990 Expr *getIdx() { 1991 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1992 } 1993 1994 const Expr *getIdx() const { 1995 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1996 } 1997 1998 SourceRange getSourceRange() const LLVM_READONLY { 1999 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 2000 } 2001 2002 SourceLocation getRBracketLoc() const { return RBracketLoc; } 2003 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 2004 2005 SourceLocation getExprLoc() const LLVM_READONLY { return getBase()->getExprLoc(); } 2006 2007 static bool classof(const Stmt *T) { 2008 return T->getStmtClass() == ArraySubscriptExprClass; 2009 } 2010 static bool classof(const ArraySubscriptExpr *) { return true; } 2011 2012 // Iterators 2013 child_range children() { 2014 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2015 } 2016}; 2017 2018 2019/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 2020/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 2021/// while its subclasses may represent alternative syntax that (semantically) 2022/// results in a function call. For example, CXXOperatorCallExpr is 2023/// a subclass for overloaded operator calls that use operator syntax, e.g., 2024/// "str1 + str2" to resolve to a function call. 2025class CallExpr : public Expr { 2026 enum { FN=0, PREARGS_START=1 }; 2027 Stmt **SubExprs; 2028 unsigned NumArgs; 2029 SourceLocation RParenLoc; 2030 2031protected: 2032 // These versions of the constructor are for derived classes. 2033 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 2034 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 2035 SourceLocation rparenloc); 2036 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 2037 2038 Stmt *getPreArg(unsigned i) { 2039 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2040 return SubExprs[PREARGS_START+i]; 2041 } 2042 const Stmt *getPreArg(unsigned i) const { 2043 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2044 return SubExprs[PREARGS_START+i]; 2045 } 2046 void setPreArg(unsigned i, Stmt *PreArg) { 2047 assert(i < getNumPreArgs() && "Prearg access out of range!"); 2048 SubExprs[PREARGS_START+i] = PreArg; 2049 } 2050 2051 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 2052 2053public: 2054 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 2055 ExprValueKind VK, SourceLocation rparenloc); 2056 2057 /// \brief Build an empty call expression. 2058 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 2059 2060 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 2061 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 2062 void setCallee(Expr *F) { SubExprs[FN] = F; } 2063 2064 Decl *getCalleeDecl(); 2065 const Decl *getCalleeDecl() const { 2066 return const_cast<CallExpr*>(this)->getCalleeDecl(); 2067 } 2068 2069 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 2070 FunctionDecl *getDirectCallee(); 2071 const FunctionDecl *getDirectCallee() const { 2072 return const_cast<CallExpr*>(this)->getDirectCallee(); 2073 } 2074 2075 /// getNumArgs - Return the number of actual arguments to this call. 2076 /// 2077 unsigned getNumArgs() const { return NumArgs; } 2078 2079 /// \brief Retrieve the call arguments. 2080 Expr **getArgs() { 2081 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 2082 } 2083 const Expr *const *getArgs() const { 2084 return const_cast<CallExpr*>(this)->getArgs(); 2085 } 2086 2087 /// getArg - Return the specified argument. 2088 Expr *getArg(unsigned Arg) { 2089 assert(Arg < NumArgs && "Arg access out of range!"); 2090 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2091 } 2092 const Expr *getArg(unsigned Arg) const { 2093 assert(Arg < NumArgs && "Arg access out of range!"); 2094 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 2095 } 2096 2097 /// setArg - Set the specified argument. 2098 void setArg(unsigned Arg, Expr *ArgExpr) { 2099 assert(Arg < NumArgs && "Arg access out of range!"); 2100 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 2101 } 2102 2103 /// setNumArgs - This changes the number of arguments present in this call. 2104 /// Any orphaned expressions are deleted by this, and any new operands are set 2105 /// to null. 2106 void setNumArgs(ASTContext& C, unsigned NumArgs); 2107 2108 typedef ExprIterator arg_iterator; 2109 typedef ConstExprIterator const_arg_iterator; 2110 2111 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 2112 arg_iterator arg_end() { 2113 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2114 } 2115 const_arg_iterator arg_begin() const { 2116 return SubExprs+PREARGS_START+getNumPreArgs(); 2117 } 2118 const_arg_iterator arg_end() const { 2119 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 2120 } 2121 2122 /// getNumCommas - Return the number of commas that must have been present in 2123 /// this function call. 2124 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 2125 2126 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 2127 /// not, return 0. 2128 unsigned isBuiltinCall() const; 2129 2130 /// getCallReturnType - Get the return type of the call expr. This is not 2131 /// always the type of the expr itself, if the return type is a reference 2132 /// type. 2133 QualType getCallReturnType() const; 2134 2135 SourceLocation getRParenLoc() const { return RParenLoc; } 2136 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2137 2138 SourceRange getSourceRange() const LLVM_READONLY; 2139 SourceLocation getLocStart() const LLVM_READONLY; 2140 SourceLocation getLocEnd() const LLVM_READONLY; 2141 2142 static bool classof(const Stmt *T) { 2143 return T->getStmtClass() >= firstCallExprConstant && 2144 T->getStmtClass() <= lastCallExprConstant; 2145 } 2146 static bool classof(const CallExpr *) { return true; } 2147 2148 // Iterators 2149 child_range children() { 2150 return child_range(&SubExprs[0], 2151 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 2152 } 2153}; 2154 2155/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 2156/// 2157class MemberExpr : public Expr { 2158 /// Extra data stored in some member expressions. 2159 struct MemberNameQualifier { 2160 /// \brief The nested-name-specifier that qualifies the name, including 2161 /// source-location information. 2162 NestedNameSpecifierLoc QualifierLoc; 2163 2164 /// \brief The DeclAccessPair through which the MemberDecl was found due to 2165 /// name qualifiers. 2166 DeclAccessPair FoundDecl; 2167 }; 2168 2169 /// Base - the expression for the base pointer or structure references. In 2170 /// X.F, this is "X". 2171 Stmt *Base; 2172 2173 /// MemberDecl - This is the decl being referenced by the field/member name. 2174 /// In X.F, this is the decl referenced by F. 2175 ValueDecl *MemberDecl; 2176 2177 /// MemberDNLoc - Provides source/type location info for the 2178 /// declaration name embedded in MemberDecl. 2179 DeclarationNameLoc MemberDNLoc; 2180 2181 /// MemberLoc - This is the location of the member name. 2182 SourceLocation MemberLoc; 2183 2184 /// IsArrow - True if this is "X->F", false if this is "X.F". 2185 bool IsArrow : 1; 2186 2187 /// \brief True if this member expression used a nested-name-specifier to 2188 /// refer to the member, e.g., "x->Base::f", or found its member via a using 2189 /// declaration. When true, a MemberNameQualifier 2190 /// structure is allocated immediately after the MemberExpr. 2191 bool HasQualifierOrFoundDecl : 1; 2192 2193 /// \brief True if this member expression specified a template keyword 2194 /// and/or a template argument list explicitly, e.g., x->f<int>, 2195 /// x->template f, x->template f<int>. 2196 /// When true, an ASTTemplateKWAndArgsInfo structure and its 2197 /// TemplateArguments (if any) are allocated immediately after 2198 /// the MemberExpr or, if the member expression also has a qualifier, 2199 /// after the MemberNameQualifier structure. 2200 bool HasTemplateKWAndArgsInfo : 1; 2201 2202 /// \brief True if this member expression refers to a method that 2203 /// was resolved from an overloaded set having size greater than 1. 2204 bool HadMultipleCandidates : 1; 2205 2206 /// \brief Retrieve the qualifier that preceded the member name, if any. 2207 MemberNameQualifier *getMemberQualifier() { 2208 assert(HasQualifierOrFoundDecl); 2209 return reinterpret_cast<MemberNameQualifier *> (this + 1); 2210 } 2211 2212 /// \brief Retrieve the qualifier that preceded the member name, if any. 2213 const MemberNameQualifier *getMemberQualifier() const { 2214 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 2215 } 2216 2217public: 2218 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2219 const DeclarationNameInfo &NameInfo, QualType ty, 2220 ExprValueKind VK, ExprObjectKind OK) 2221 : Expr(MemberExprClass, ty, VK, OK, 2222 base->isTypeDependent(), 2223 base->isValueDependent(), 2224 base->isInstantiationDependent(), 2225 base->containsUnexpandedParameterPack()), 2226 Base(base), MemberDecl(memberdecl), MemberDNLoc(NameInfo.getInfo()), 2227 MemberLoc(NameInfo.getLoc()), IsArrow(isarrow), 2228 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2229 HadMultipleCandidates(false) { 2230 assert(memberdecl->getDeclName() == NameInfo.getName()); 2231 } 2232 2233 // NOTE: this constructor should be used only when it is known that 2234 // the member name can not provide additional syntactic info 2235 // (i.e., source locations for C++ operator names or type source info 2236 // for constructors, destructors and conversion operators). 2237 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2238 SourceLocation l, QualType ty, 2239 ExprValueKind VK, ExprObjectKind OK) 2240 : Expr(MemberExprClass, ty, VK, OK, 2241 base->isTypeDependent(), base->isValueDependent(), 2242 base->isInstantiationDependent(), 2243 base->containsUnexpandedParameterPack()), 2244 Base(base), MemberDecl(memberdecl), MemberDNLoc(), MemberLoc(l), 2245 IsArrow(isarrow), 2246 HasQualifierOrFoundDecl(false), HasTemplateKWAndArgsInfo(false), 2247 HadMultipleCandidates(false) {} 2248 2249 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2250 NestedNameSpecifierLoc QualifierLoc, 2251 SourceLocation TemplateKWLoc, 2252 ValueDecl *memberdecl, DeclAccessPair founddecl, 2253 DeclarationNameInfo MemberNameInfo, 2254 const TemplateArgumentListInfo *targs, 2255 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2256 2257 void setBase(Expr *E) { Base = E; } 2258 Expr *getBase() const { return cast<Expr>(Base); } 2259 2260 /// \brief Retrieve the member declaration to which this expression refers. 2261 /// 2262 /// The returned declaration will either be a FieldDecl or (in C++) 2263 /// a CXXMethodDecl. 2264 ValueDecl *getMemberDecl() const { return MemberDecl; } 2265 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2266 2267 /// \brief Retrieves the declaration found by lookup. 2268 DeclAccessPair getFoundDecl() const { 2269 if (!HasQualifierOrFoundDecl) 2270 return DeclAccessPair::make(getMemberDecl(), 2271 getMemberDecl()->getAccess()); 2272 return getMemberQualifier()->FoundDecl; 2273 } 2274 2275 /// \brief Determines whether this member expression actually had 2276 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2277 /// x->Base::foo. 2278 bool hasQualifier() const { return getQualifier() != 0; } 2279 2280 /// \brief If the member name was qualified, retrieves the 2281 /// nested-name-specifier that precedes the member name. Otherwise, returns 2282 /// NULL. 2283 NestedNameSpecifier *getQualifier() const { 2284 if (!HasQualifierOrFoundDecl) 2285 return 0; 2286 2287 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2288 } 2289 2290 /// \brief If the member name was qualified, retrieves the 2291 /// nested-name-specifier that precedes the member name, with source-location 2292 /// information. 2293 NestedNameSpecifierLoc getQualifierLoc() const { 2294 if (!hasQualifier()) 2295 return NestedNameSpecifierLoc(); 2296 2297 return getMemberQualifier()->QualifierLoc; 2298 } 2299 2300 /// \brief Return the optional template keyword and arguments info. 2301 ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() { 2302 if (!HasTemplateKWAndArgsInfo) 2303 return 0; 2304 2305 if (!HasQualifierOrFoundDecl) 2306 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>(this + 1); 2307 2308 return reinterpret_cast<ASTTemplateKWAndArgsInfo *>( 2309 getMemberQualifier() + 1); 2310 } 2311 2312 /// \brief Return the optional template keyword and arguments info. 2313 const ASTTemplateKWAndArgsInfo *getTemplateKWAndArgsInfo() const { 2314 return const_cast<MemberExpr*>(this)->getTemplateKWAndArgsInfo(); 2315 } 2316 2317 /// \brief Retrieve the location of the template keyword preceding 2318 /// the member name, if any. 2319 SourceLocation getTemplateKeywordLoc() const { 2320 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2321 return getTemplateKWAndArgsInfo()->getTemplateKeywordLoc(); 2322 } 2323 2324 /// \brief Retrieve the location of the left angle bracket starting the 2325 /// explicit template argument list following the member name, if any. 2326 SourceLocation getLAngleLoc() const { 2327 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2328 return getTemplateKWAndArgsInfo()->LAngleLoc; 2329 } 2330 2331 /// \brief Retrieve the location of the right angle bracket ending the 2332 /// explicit template argument list following the member name, if any. 2333 SourceLocation getRAngleLoc() const { 2334 if (!HasTemplateKWAndArgsInfo) return SourceLocation(); 2335 return getTemplateKWAndArgsInfo()->RAngleLoc; 2336 } 2337 2338 /// Determines whether the member name was preceded by the template keyword. 2339 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); } 2340 2341 /// \brief Determines whether the member name was followed by an 2342 /// explicit template argument list. 2343 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); } 2344 2345 /// \brief Copies the template arguments (if present) into the given 2346 /// structure. 2347 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2348 if (hasExplicitTemplateArgs()) 2349 getExplicitTemplateArgs().copyInto(List); 2350 } 2351 2352 /// \brief Retrieve the explicit template argument list that 2353 /// follow the member template name. This must only be called on an 2354 /// expression with explicit template arguments. 2355 ASTTemplateArgumentListInfo &getExplicitTemplateArgs() { 2356 assert(hasExplicitTemplateArgs()); 2357 return *getTemplateKWAndArgsInfo(); 2358 } 2359 2360 /// \brief Retrieve the explicit template argument list that 2361 /// followed the member template name. This must only be called on 2362 /// an expression with explicit template arguments. 2363 const ASTTemplateArgumentListInfo &getExplicitTemplateArgs() const { 2364 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2365 } 2366 2367 /// \brief Retrieves the optional explicit template arguments. 2368 /// This points to the same data as getExplicitTemplateArgs(), but 2369 /// returns null if there are no explicit template arguments. 2370 const ASTTemplateArgumentListInfo *getOptionalExplicitTemplateArgs() const { 2371 if (!hasExplicitTemplateArgs()) return 0; 2372 return &getExplicitTemplateArgs(); 2373 } 2374 2375 /// \brief Retrieve the template arguments provided as part of this 2376 /// template-id. 2377 const TemplateArgumentLoc *getTemplateArgs() const { 2378 if (!hasExplicitTemplateArgs()) 2379 return 0; 2380 2381 return getExplicitTemplateArgs().getTemplateArgs(); 2382 } 2383 2384 /// \brief Retrieve the number of template arguments provided as part of this 2385 /// template-id. 2386 unsigned getNumTemplateArgs() const { 2387 if (!hasExplicitTemplateArgs()) 2388 return 0; 2389 2390 return getExplicitTemplateArgs().NumTemplateArgs; 2391 } 2392 2393 /// \brief Retrieve the member declaration name info. 2394 DeclarationNameInfo getMemberNameInfo() const { 2395 return DeclarationNameInfo(MemberDecl->getDeclName(), 2396 MemberLoc, MemberDNLoc); 2397 } 2398 2399 bool isArrow() const { return IsArrow; } 2400 void setArrow(bool A) { IsArrow = A; } 2401 2402 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2403 /// location of 'F'. 2404 SourceLocation getMemberLoc() const { return MemberLoc; } 2405 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2406 2407 SourceRange getSourceRange() const LLVM_READONLY; 2408 SourceLocation getLocStart() const LLVM_READONLY; 2409 SourceLocation getLocEnd() const LLVM_READONLY; 2410 2411 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; } 2412 2413 /// \brief Determine whether the base of this explicit is implicit. 2414 bool isImplicitAccess() const { 2415 return getBase() && getBase()->isImplicitCXXThis(); 2416 } 2417 2418 /// \brief Returns true if this member expression refers to a method that 2419 /// was resolved from an overloaded set having size greater than 1. 2420 bool hadMultipleCandidates() const { 2421 return HadMultipleCandidates; 2422 } 2423 /// \brief Sets the flag telling whether this expression refers to 2424 /// a method that was resolved from an overloaded set having size 2425 /// greater than 1. 2426 void setHadMultipleCandidates(bool V = true) { 2427 HadMultipleCandidates = V; 2428 } 2429 2430 static bool classof(const Stmt *T) { 2431 return T->getStmtClass() == MemberExprClass; 2432 } 2433 static bool classof(const MemberExpr *) { return true; } 2434 2435 // Iterators 2436 child_range children() { return child_range(&Base, &Base+1); } 2437 2438 friend class ASTReader; 2439 friend class ASTStmtWriter; 2440}; 2441 2442/// CompoundLiteralExpr - [C99 6.5.2.5] 2443/// 2444class CompoundLiteralExpr : public Expr { 2445 /// LParenLoc - If non-null, this is the location of the left paren in a 2446 /// compound literal like "(int){4}". This can be null if this is a 2447 /// synthesized compound expression. 2448 SourceLocation LParenLoc; 2449 2450 /// The type as written. This can be an incomplete array type, in 2451 /// which case the actual expression type will be different. 2452 /// The int part of the pair stores whether this expr is file scope. 2453 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope; 2454 Stmt *Init; 2455public: 2456 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2457 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2458 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2459 tinfo->getType()->isDependentType(), 2460 init->isValueDependent(), 2461 (init->isInstantiationDependent() || 2462 tinfo->getType()->isInstantiationDependentType()), 2463 init->containsUnexpandedParameterPack()), 2464 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {} 2465 2466 /// \brief Construct an empty compound literal. 2467 explicit CompoundLiteralExpr(EmptyShell Empty) 2468 : Expr(CompoundLiteralExprClass, Empty) { } 2469 2470 const Expr *getInitializer() const { return cast<Expr>(Init); } 2471 Expr *getInitializer() { return cast<Expr>(Init); } 2472 void setInitializer(Expr *E) { Init = E; } 2473 2474 bool isFileScope() const { return TInfoAndScope.getInt(); } 2475 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); } 2476 2477 SourceLocation getLParenLoc() const { return LParenLoc; } 2478 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2479 2480 TypeSourceInfo *getTypeSourceInfo() const { 2481 return TInfoAndScope.getPointer(); 2482 } 2483 void setTypeSourceInfo(TypeSourceInfo *tinfo) { 2484 TInfoAndScope.setPointer(tinfo); 2485 } 2486 2487 SourceRange getSourceRange() const LLVM_READONLY { 2488 // FIXME: Init should never be null. 2489 if (!Init) 2490 return SourceRange(); 2491 if (LParenLoc.isInvalid()) 2492 return Init->getSourceRange(); 2493 return SourceRange(LParenLoc, Init->getLocEnd()); 2494 } 2495 2496 static bool classof(const Stmt *T) { 2497 return T->getStmtClass() == CompoundLiteralExprClass; 2498 } 2499 static bool classof(const CompoundLiteralExpr *) { return true; } 2500 2501 // Iterators 2502 child_range children() { return child_range(&Init, &Init+1); } 2503}; 2504 2505/// CastExpr - Base class for type casts, including both implicit 2506/// casts (ImplicitCastExpr) and explicit casts that have some 2507/// representation in the source code (ExplicitCastExpr's derived 2508/// classes). 2509class CastExpr : public Expr { 2510public: 2511 typedef clang::CastKind CastKind; 2512 2513private: 2514 Stmt *Op; 2515 2516 void CheckCastConsistency() const; 2517 2518 const CXXBaseSpecifier * const *path_buffer() const { 2519 return const_cast<CastExpr*>(this)->path_buffer(); 2520 } 2521 CXXBaseSpecifier **path_buffer(); 2522 2523 void setBasePathSize(unsigned basePathSize) { 2524 CastExprBits.BasePathSize = basePathSize; 2525 assert(CastExprBits.BasePathSize == basePathSize && 2526 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2527 } 2528 2529protected: 2530 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2531 const CastKind kind, Expr *op, unsigned BasePathSize) : 2532 Expr(SC, ty, VK, OK_Ordinary, 2533 // Cast expressions are type-dependent if the type is 2534 // dependent (C++ [temp.dep.expr]p3). 2535 ty->isDependentType(), 2536 // Cast expressions are value-dependent if the type is 2537 // dependent or if the subexpression is value-dependent. 2538 ty->isDependentType() || (op && op->isValueDependent()), 2539 (ty->isInstantiationDependentType() || 2540 (op && op->isInstantiationDependent())), 2541 (ty->containsUnexpandedParameterPack() || 2542 op->containsUnexpandedParameterPack())), 2543 Op(op) { 2544 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2545 CastExprBits.Kind = kind; 2546 setBasePathSize(BasePathSize); 2547#ifndef NDEBUG 2548 CheckCastConsistency(); 2549#endif 2550 } 2551 2552 /// \brief Construct an empty cast. 2553 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2554 : Expr(SC, Empty) { 2555 setBasePathSize(BasePathSize); 2556 } 2557 2558public: 2559 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2560 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2561 const char *getCastKindName() const; 2562 2563 Expr *getSubExpr() { return cast<Expr>(Op); } 2564 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2565 void setSubExpr(Expr *E) { Op = E; } 2566 2567 /// \brief Retrieve the cast subexpression as it was written in the source 2568 /// code, looking through any implicit casts or other intermediate nodes 2569 /// introduced by semantic analysis. 2570 Expr *getSubExprAsWritten(); 2571 const Expr *getSubExprAsWritten() const { 2572 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2573 } 2574 2575 typedef CXXBaseSpecifier **path_iterator; 2576 typedef const CXXBaseSpecifier * const *path_const_iterator; 2577 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2578 unsigned path_size() const { return CastExprBits.BasePathSize; } 2579 path_iterator path_begin() { return path_buffer(); } 2580 path_iterator path_end() { return path_buffer() + path_size(); } 2581 path_const_iterator path_begin() const { return path_buffer(); } 2582 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2583 2584 void setCastPath(const CXXCastPath &Path); 2585 2586 static bool classof(const Stmt *T) { 2587 return T->getStmtClass() >= firstCastExprConstant && 2588 T->getStmtClass() <= lastCastExprConstant; 2589 } 2590 static bool classof(const CastExpr *) { return true; } 2591 2592 // Iterators 2593 child_range children() { return child_range(&Op, &Op+1); } 2594}; 2595 2596/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2597/// conversions, which have no direct representation in the original 2598/// source code. For example: converting T[]->T*, void f()->void 2599/// (*f)(), float->double, short->int, etc. 2600/// 2601/// In C, implicit casts always produce rvalues. However, in C++, an 2602/// implicit cast whose result is being bound to a reference will be 2603/// an lvalue or xvalue. For example: 2604/// 2605/// @code 2606/// class Base { }; 2607/// class Derived : public Base { }; 2608/// Derived &&ref(); 2609/// void f(Derived d) { 2610/// Base& b = d; // initializer is an ImplicitCastExpr 2611/// // to an lvalue of type Base 2612/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2613/// // to an xvalue of type Base 2614/// } 2615/// @endcode 2616class ImplicitCastExpr : public CastExpr { 2617private: 2618 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2619 unsigned BasePathLength, ExprValueKind VK) 2620 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2621 } 2622 2623 /// \brief Construct an empty implicit cast. 2624 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2625 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2626 2627public: 2628 enum OnStack_t { OnStack }; 2629 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2630 ExprValueKind VK) 2631 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2632 } 2633 2634 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2635 CastKind Kind, Expr *Operand, 2636 const CXXCastPath *BasePath, 2637 ExprValueKind Cat); 2638 2639 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2640 2641 SourceRange getSourceRange() const LLVM_READONLY { 2642 return getSubExpr()->getSourceRange(); 2643 } 2644 SourceLocation getLocStart() const LLVM_READONLY { 2645 return getSubExpr()->getLocStart(); 2646 } 2647 SourceLocation getLocEnd() const LLVM_READONLY { 2648 return getSubExpr()->getLocEnd(); 2649 } 2650 2651 static bool classof(const Stmt *T) { 2652 return T->getStmtClass() == ImplicitCastExprClass; 2653 } 2654 static bool classof(const ImplicitCastExpr *) { return true; } 2655}; 2656 2657inline Expr *Expr::IgnoreImpCasts() { 2658 Expr *e = this; 2659 while (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 2660 e = ice->getSubExpr(); 2661 return e; 2662} 2663 2664/// ExplicitCastExpr - An explicit cast written in the source 2665/// code. 2666/// 2667/// This class is effectively an abstract class, because it provides 2668/// the basic representation of an explicitly-written cast without 2669/// specifying which kind of cast (C cast, functional cast, static 2670/// cast, etc.) was written; specific derived classes represent the 2671/// particular style of cast and its location information. 2672/// 2673/// Unlike implicit casts, explicit cast nodes have two different 2674/// types: the type that was written into the source code, and the 2675/// actual type of the expression as determined by semantic 2676/// analysis. These types may differ slightly. For example, in C++ one 2677/// can cast to a reference type, which indicates that the resulting 2678/// expression will be an lvalue or xvalue. The reference type, however, 2679/// will not be used as the type of the expression. 2680class ExplicitCastExpr : public CastExpr { 2681 /// TInfo - Source type info for the (written) type 2682 /// this expression is casting to. 2683 TypeSourceInfo *TInfo; 2684 2685protected: 2686 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2687 CastKind kind, Expr *op, unsigned PathSize, 2688 TypeSourceInfo *writtenTy) 2689 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2690 2691 /// \brief Construct an empty explicit cast. 2692 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2693 : CastExpr(SC, Shell, PathSize) { } 2694 2695public: 2696 /// getTypeInfoAsWritten - Returns the type source info for the type 2697 /// that this expression is casting to. 2698 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2699 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2700 2701 /// getTypeAsWritten - Returns the type that this expression is 2702 /// casting to, as written in the source code. 2703 QualType getTypeAsWritten() const { return TInfo->getType(); } 2704 2705 static bool classof(const Stmt *T) { 2706 return T->getStmtClass() >= firstExplicitCastExprConstant && 2707 T->getStmtClass() <= lastExplicitCastExprConstant; 2708 } 2709 static bool classof(const ExplicitCastExpr *) { return true; } 2710}; 2711 2712/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2713/// cast in C++ (C++ [expr.cast]), which uses the syntax 2714/// (Type)expr. For example: @c (int)f. 2715class CStyleCastExpr : public ExplicitCastExpr { 2716 SourceLocation LPLoc; // the location of the left paren 2717 SourceLocation RPLoc; // the location of the right paren 2718 2719 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2720 unsigned PathSize, TypeSourceInfo *writtenTy, 2721 SourceLocation l, SourceLocation r) 2722 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2723 writtenTy), LPLoc(l), RPLoc(r) {} 2724 2725 /// \brief Construct an empty C-style explicit cast. 2726 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2727 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2728 2729public: 2730 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2731 ExprValueKind VK, CastKind K, 2732 Expr *Op, const CXXCastPath *BasePath, 2733 TypeSourceInfo *WrittenTy, SourceLocation L, 2734 SourceLocation R); 2735 2736 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2737 2738 SourceLocation getLParenLoc() const { return LPLoc; } 2739 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2740 2741 SourceLocation getRParenLoc() const { return RPLoc; } 2742 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2743 2744 SourceRange getSourceRange() const LLVM_READONLY { 2745 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2746 } 2747 static bool classof(const Stmt *T) { 2748 return T->getStmtClass() == CStyleCastExprClass; 2749 } 2750 static bool classof(const CStyleCastExpr *) { return true; } 2751}; 2752 2753/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2754/// 2755/// This expression node kind describes a builtin binary operation, 2756/// such as "x + y" for integer values "x" and "y". The operands will 2757/// already have been converted to appropriate types (e.g., by 2758/// performing promotions or conversions). 2759/// 2760/// In C++, where operators may be overloaded, a different kind of 2761/// expression node (CXXOperatorCallExpr) is used to express the 2762/// invocation of an overloaded operator with operator syntax. Within 2763/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2764/// used to store an expression "x + y" depends on the subexpressions 2765/// for x and y. If neither x or y is type-dependent, and the "+" 2766/// operator resolves to a built-in operation, BinaryOperator will be 2767/// used to express the computation (x and y may still be 2768/// value-dependent). If either x or y is type-dependent, or if the 2769/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2770/// be used to express the computation. 2771class BinaryOperator : public Expr { 2772public: 2773 typedef BinaryOperatorKind Opcode; 2774 2775private: 2776 unsigned Opc : 6; 2777 SourceLocation OpLoc; 2778 2779 enum { LHS, RHS, END_EXPR }; 2780 Stmt* SubExprs[END_EXPR]; 2781public: 2782 2783 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2784 ExprValueKind VK, ExprObjectKind OK, 2785 SourceLocation opLoc) 2786 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2787 lhs->isTypeDependent() || rhs->isTypeDependent(), 2788 lhs->isValueDependent() || rhs->isValueDependent(), 2789 (lhs->isInstantiationDependent() || 2790 rhs->isInstantiationDependent()), 2791 (lhs->containsUnexpandedParameterPack() || 2792 rhs->containsUnexpandedParameterPack())), 2793 Opc(opc), OpLoc(opLoc) { 2794 SubExprs[LHS] = lhs; 2795 SubExprs[RHS] = rhs; 2796 assert(!isCompoundAssignmentOp() && 2797 "Use ArithAssignBinaryOperator for compound assignments"); 2798 } 2799 2800 /// \brief Construct an empty binary operator. 2801 explicit BinaryOperator(EmptyShell Empty) 2802 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2803 2804 SourceLocation getExprLoc() const LLVM_READONLY { return OpLoc; } 2805 SourceLocation getOperatorLoc() const { return OpLoc; } 2806 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2807 2808 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2809 void setOpcode(Opcode O) { Opc = O; } 2810 2811 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2812 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2813 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2814 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2815 2816 SourceRange getSourceRange() const LLVM_READONLY { 2817 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2818 } 2819 2820 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2821 /// corresponds to, e.g. "<<=". 2822 static const char *getOpcodeStr(Opcode Op); 2823 2824 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2825 2826 /// \brief Retrieve the binary opcode that corresponds to the given 2827 /// overloaded operator. 2828 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2829 2830 /// \brief Retrieve the overloaded operator kind that corresponds to 2831 /// the given binary opcode. 2832 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2833 2834 /// predicates to categorize the respective opcodes. 2835 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2836 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2837 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2838 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2839 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2840 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2841 2842 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2843 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2844 2845 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2846 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2847 2848 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2849 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2850 2851 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2852 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2853 2854 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2855 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2856 2857 static bool isAssignmentOp(Opcode Opc) { 2858 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2859 } 2860 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2861 2862 static bool isCompoundAssignmentOp(Opcode Opc) { 2863 return Opc > BO_Assign && Opc <= BO_OrAssign; 2864 } 2865 bool isCompoundAssignmentOp() const { 2866 return isCompoundAssignmentOp(getOpcode()); 2867 } 2868 static Opcode getOpForCompoundAssignment(Opcode Opc) { 2869 assert(isCompoundAssignmentOp(Opc)); 2870 if (Opc >= BO_AndAssign) 2871 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And); 2872 else 2873 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul); 2874 } 2875 2876 static bool isShiftAssignOp(Opcode Opc) { 2877 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2878 } 2879 bool isShiftAssignOp() const { 2880 return isShiftAssignOp(getOpcode()); 2881 } 2882 2883 static bool classof(const Stmt *S) { 2884 return S->getStmtClass() >= firstBinaryOperatorConstant && 2885 S->getStmtClass() <= lastBinaryOperatorConstant; 2886 } 2887 static bool classof(const BinaryOperator *) { return true; } 2888 2889 // Iterators 2890 child_range children() { 2891 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2892 } 2893 2894protected: 2895 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2896 ExprValueKind VK, ExprObjectKind OK, 2897 SourceLocation opLoc, bool dead) 2898 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2899 lhs->isTypeDependent() || rhs->isTypeDependent(), 2900 lhs->isValueDependent() || rhs->isValueDependent(), 2901 (lhs->isInstantiationDependent() || 2902 rhs->isInstantiationDependent()), 2903 (lhs->containsUnexpandedParameterPack() || 2904 rhs->containsUnexpandedParameterPack())), 2905 Opc(opc), OpLoc(opLoc) { 2906 SubExprs[LHS] = lhs; 2907 SubExprs[RHS] = rhs; 2908 } 2909 2910 BinaryOperator(StmtClass SC, EmptyShell Empty) 2911 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2912}; 2913 2914/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2915/// track of the type the operation is performed in. Due to the semantics of 2916/// these operators, the operands are promoted, the arithmetic performed, an 2917/// implicit conversion back to the result type done, then the assignment takes 2918/// place. This captures the intermediate type which the computation is done 2919/// in. 2920class CompoundAssignOperator : public BinaryOperator { 2921 QualType ComputationLHSType; 2922 QualType ComputationResultType; 2923public: 2924 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2925 ExprValueKind VK, ExprObjectKind OK, 2926 QualType CompLHSType, QualType CompResultType, 2927 SourceLocation OpLoc) 2928 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2929 ComputationLHSType(CompLHSType), 2930 ComputationResultType(CompResultType) { 2931 assert(isCompoundAssignmentOp() && 2932 "Only should be used for compound assignments"); 2933 } 2934 2935 /// \brief Build an empty compound assignment operator expression. 2936 explicit CompoundAssignOperator(EmptyShell Empty) 2937 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2938 2939 // The two computation types are the type the LHS is converted 2940 // to for the computation and the type of the result; the two are 2941 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2942 QualType getComputationLHSType() const { return ComputationLHSType; } 2943 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2944 2945 QualType getComputationResultType() const { return ComputationResultType; } 2946 void setComputationResultType(QualType T) { ComputationResultType = T; } 2947 2948 static bool classof(const CompoundAssignOperator *) { return true; } 2949 static bool classof(const Stmt *S) { 2950 return S->getStmtClass() == CompoundAssignOperatorClass; 2951 } 2952}; 2953 2954/// AbstractConditionalOperator - An abstract base class for 2955/// ConditionalOperator and BinaryConditionalOperator. 2956class AbstractConditionalOperator : public Expr { 2957 SourceLocation QuestionLoc, ColonLoc; 2958 friend class ASTStmtReader; 2959 2960protected: 2961 AbstractConditionalOperator(StmtClass SC, QualType T, 2962 ExprValueKind VK, ExprObjectKind OK, 2963 bool TD, bool VD, bool ID, 2964 bool ContainsUnexpandedParameterPack, 2965 SourceLocation qloc, 2966 SourceLocation cloc) 2967 : Expr(SC, T, VK, OK, TD, VD, ID, ContainsUnexpandedParameterPack), 2968 QuestionLoc(qloc), ColonLoc(cloc) {} 2969 2970 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2971 : Expr(SC, Empty) { } 2972 2973public: 2974 // getCond - Return the expression representing the condition for 2975 // the ?: operator. 2976 Expr *getCond() const; 2977 2978 // getTrueExpr - Return the subexpression representing the value of 2979 // the expression if the condition evaluates to true. 2980 Expr *getTrueExpr() const; 2981 2982 // getFalseExpr - Return the subexpression representing the value of 2983 // the expression if the condition evaluates to false. This is 2984 // the same as getRHS. 2985 Expr *getFalseExpr() const; 2986 2987 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2988 SourceLocation getColonLoc() const { return ColonLoc; } 2989 2990 static bool classof(const Stmt *T) { 2991 return T->getStmtClass() == ConditionalOperatorClass || 2992 T->getStmtClass() == BinaryConditionalOperatorClass; 2993 } 2994 static bool classof(const AbstractConditionalOperator *) { return true; } 2995}; 2996 2997/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2998/// middle" extension is a BinaryConditionalOperator. 2999class ConditionalOperator : public AbstractConditionalOperator { 3000 enum { COND, LHS, RHS, END_EXPR }; 3001 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3002 3003 friend class ASTStmtReader; 3004public: 3005 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 3006 SourceLocation CLoc, Expr *rhs, 3007 QualType t, ExprValueKind VK, ExprObjectKind OK) 3008 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 3009 // FIXME: the type of the conditional operator doesn't 3010 // depend on the type of the conditional, but the standard 3011 // seems to imply that it could. File a bug! 3012 (lhs->isTypeDependent() || rhs->isTypeDependent()), 3013 (cond->isValueDependent() || lhs->isValueDependent() || 3014 rhs->isValueDependent()), 3015 (cond->isInstantiationDependent() || 3016 lhs->isInstantiationDependent() || 3017 rhs->isInstantiationDependent()), 3018 (cond->containsUnexpandedParameterPack() || 3019 lhs->containsUnexpandedParameterPack() || 3020 rhs->containsUnexpandedParameterPack()), 3021 QLoc, CLoc) { 3022 SubExprs[COND] = cond; 3023 SubExprs[LHS] = lhs; 3024 SubExprs[RHS] = rhs; 3025 } 3026 3027 /// \brief Build an empty conditional operator. 3028 explicit ConditionalOperator(EmptyShell Empty) 3029 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 3030 3031 // getCond - Return the expression representing the condition for 3032 // the ?: operator. 3033 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3034 3035 // getTrueExpr - Return the subexpression representing the value of 3036 // the expression if the condition evaluates to true. 3037 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 3038 3039 // getFalseExpr - Return the subexpression representing the value of 3040 // the expression if the condition evaluates to false. This is 3041 // the same as getRHS. 3042 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 3043 3044 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3045 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3046 3047 SourceRange getSourceRange() const LLVM_READONLY { 3048 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 3049 } 3050 static bool classof(const Stmt *T) { 3051 return T->getStmtClass() == ConditionalOperatorClass; 3052 } 3053 static bool classof(const ConditionalOperator *) { return true; } 3054 3055 // Iterators 3056 child_range children() { 3057 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3058 } 3059}; 3060 3061/// BinaryConditionalOperator - The GNU extension to the conditional 3062/// operator which allows the middle operand to be omitted. 3063/// 3064/// This is a different expression kind on the assumption that almost 3065/// every client ends up needing to know that these are different. 3066class BinaryConditionalOperator : public AbstractConditionalOperator { 3067 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 3068 3069 /// - the common condition/left-hand-side expression, which will be 3070 /// evaluated as the opaque value 3071 /// - the condition, expressed in terms of the opaque value 3072 /// - the left-hand-side, expressed in terms of the opaque value 3073 /// - the right-hand-side 3074 Stmt *SubExprs[NUM_SUBEXPRS]; 3075 OpaqueValueExpr *OpaqueValue; 3076 3077 friend class ASTStmtReader; 3078public: 3079 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 3080 Expr *cond, Expr *lhs, Expr *rhs, 3081 SourceLocation qloc, SourceLocation cloc, 3082 QualType t, ExprValueKind VK, ExprObjectKind OK) 3083 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 3084 (common->isTypeDependent() || rhs->isTypeDependent()), 3085 (common->isValueDependent() || rhs->isValueDependent()), 3086 (common->isInstantiationDependent() || 3087 rhs->isInstantiationDependent()), 3088 (common->containsUnexpandedParameterPack() || 3089 rhs->containsUnexpandedParameterPack()), 3090 qloc, cloc), 3091 OpaqueValue(opaqueValue) { 3092 SubExprs[COMMON] = common; 3093 SubExprs[COND] = cond; 3094 SubExprs[LHS] = lhs; 3095 SubExprs[RHS] = rhs; 3096 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value"); 3097 } 3098 3099 /// \brief Build an empty conditional operator. 3100 explicit BinaryConditionalOperator(EmptyShell Empty) 3101 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 3102 3103 /// \brief getCommon - Return the common expression, written to the 3104 /// left of the condition. The opaque value will be bound to the 3105 /// result of this expression. 3106 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 3107 3108 /// \brief getOpaqueValue - Return the opaque value placeholder. 3109 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 3110 3111 /// \brief getCond - Return the condition expression; this is defined 3112 /// in terms of the opaque value. 3113 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3114 3115 /// \brief getTrueExpr - Return the subexpression which will be 3116 /// evaluated if the condition evaluates to true; this is defined 3117 /// in terms of the opaque value. 3118 Expr *getTrueExpr() const { 3119 return cast<Expr>(SubExprs[LHS]); 3120 } 3121 3122 /// \brief getFalseExpr - Return the subexpression which will be 3123 /// evaluated if the condnition evaluates to false; this is 3124 /// defined in terms of the opaque value. 3125 Expr *getFalseExpr() const { 3126 return cast<Expr>(SubExprs[RHS]); 3127 } 3128 3129 SourceRange getSourceRange() const LLVM_READONLY { 3130 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 3131 } 3132 static bool classof(const Stmt *T) { 3133 return T->getStmtClass() == BinaryConditionalOperatorClass; 3134 } 3135 static bool classof(const BinaryConditionalOperator *) { return true; } 3136 3137 // Iterators 3138 child_range children() { 3139 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 3140 } 3141}; 3142 3143inline Expr *AbstractConditionalOperator::getCond() const { 3144 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3145 return co->getCond(); 3146 return cast<BinaryConditionalOperator>(this)->getCond(); 3147} 3148 3149inline Expr *AbstractConditionalOperator::getTrueExpr() const { 3150 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3151 return co->getTrueExpr(); 3152 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 3153} 3154 3155inline Expr *AbstractConditionalOperator::getFalseExpr() const { 3156 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 3157 return co->getFalseExpr(); 3158 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 3159} 3160 3161/// AddrLabelExpr - The GNU address of label extension, representing &&label. 3162class AddrLabelExpr : public Expr { 3163 SourceLocation AmpAmpLoc, LabelLoc; 3164 LabelDecl *Label; 3165public: 3166 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 3167 QualType t) 3168 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false, 3169 false), 3170 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 3171 3172 /// \brief Build an empty address of a label expression. 3173 explicit AddrLabelExpr(EmptyShell Empty) 3174 : Expr(AddrLabelExprClass, Empty) { } 3175 3176 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 3177 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 3178 SourceLocation getLabelLoc() const { return LabelLoc; } 3179 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 3180 3181 SourceRange getSourceRange() const LLVM_READONLY { 3182 return SourceRange(AmpAmpLoc, LabelLoc); 3183 } 3184 3185 LabelDecl *getLabel() const { return Label; } 3186 void setLabel(LabelDecl *L) { Label = L; } 3187 3188 static bool classof(const Stmt *T) { 3189 return T->getStmtClass() == AddrLabelExprClass; 3190 } 3191 static bool classof(const AddrLabelExpr *) { return true; } 3192 3193 // Iterators 3194 child_range children() { return child_range(); } 3195}; 3196 3197/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 3198/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 3199/// takes the value of the last subexpression. 3200/// 3201/// A StmtExpr is always an r-value; values "returned" out of a 3202/// StmtExpr will be copied. 3203class StmtExpr : public Expr { 3204 Stmt *SubStmt; 3205 SourceLocation LParenLoc, RParenLoc; 3206public: 3207 // FIXME: Does type-dependence need to be computed differently? 3208 // FIXME: Do we need to compute instantiation instantiation-dependence for 3209 // statements? (ugh!) 3210 StmtExpr(CompoundStmt *substmt, QualType T, 3211 SourceLocation lp, SourceLocation rp) : 3212 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 3213 T->isDependentType(), false, false, false), 3214 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 3215 3216 /// \brief Build an empty statement expression. 3217 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 3218 3219 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 3220 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 3221 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 3222 3223 SourceRange getSourceRange() const LLVM_READONLY { 3224 return SourceRange(LParenLoc, RParenLoc); 3225 } 3226 3227 SourceLocation getLParenLoc() const { return LParenLoc; } 3228 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 3229 SourceLocation getRParenLoc() const { return RParenLoc; } 3230 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3231 3232 static bool classof(const Stmt *T) { 3233 return T->getStmtClass() == StmtExprClass; 3234 } 3235 static bool classof(const StmtExpr *) { return true; } 3236 3237 // Iterators 3238 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 3239}; 3240 3241 3242/// ShuffleVectorExpr - clang-specific builtin-in function 3243/// __builtin_shufflevector. 3244/// This AST node represents a operator that does a constant 3245/// shuffle, similar to LLVM's shufflevector instruction. It takes 3246/// two vectors and a variable number of constant indices, 3247/// and returns the appropriately shuffled vector. 3248class ShuffleVectorExpr : public Expr { 3249 SourceLocation BuiltinLoc, RParenLoc; 3250 3251 // SubExprs - the list of values passed to the __builtin_shufflevector 3252 // function. The first two are vectors, and the rest are constant 3253 // indices. The number of values in this list is always 3254 // 2+the number of indices in the vector type. 3255 Stmt **SubExprs; 3256 unsigned NumExprs; 3257 3258public: 3259 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3260 QualType Type, SourceLocation BLoc, 3261 SourceLocation RP); 3262 3263 /// \brief Build an empty vector-shuffle expression. 3264 explicit ShuffleVectorExpr(EmptyShell Empty) 3265 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3266 3267 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3268 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3269 3270 SourceLocation getRParenLoc() const { return RParenLoc; } 3271 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3272 3273 SourceRange getSourceRange() const LLVM_READONLY { 3274 return SourceRange(BuiltinLoc, RParenLoc); 3275 } 3276 static bool classof(const Stmt *T) { 3277 return T->getStmtClass() == ShuffleVectorExprClass; 3278 } 3279 static bool classof(const ShuffleVectorExpr *) { return true; } 3280 3281 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3282 /// constant expression, the actual arguments passed in, and the function 3283 /// pointers. 3284 unsigned getNumSubExprs() const { return NumExprs; } 3285 3286 /// \brief Retrieve the array of expressions. 3287 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3288 3289 /// getExpr - Return the Expr at the specified index. 3290 Expr *getExpr(unsigned Index) { 3291 assert((Index < NumExprs) && "Arg access out of range!"); 3292 return cast<Expr>(SubExprs[Index]); 3293 } 3294 const Expr *getExpr(unsigned Index) const { 3295 assert((Index < NumExprs) && "Arg access out of range!"); 3296 return cast<Expr>(SubExprs[Index]); 3297 } 3298 3299 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3300 3301 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3302 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3303 return getExpr(N+2)->EvaluateKnownConstInt(Ctx).getZExtValue(); 3304 } 3305 3306 // Iterators 3307 child_range children() { 3308 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3309 } 3310}; 3311 3312/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3313/// This AST node is similar to the conditional operator (?:) in C, with 3314/// the following exceptions: 3315/// - the test expression must be a integer constant expression. 3316/// - the expression returned acts like the chosen subexpression in every 3317/// visible way: the type is the same as that of the chosen subexpression, 3318/// and all predicates (whether it's an l-value, whether it's an integer 3319/// constant expression, etc.) return the same result as for the chosen 3320/// sub-expression. 3321class ChooseExpr : public Expr { 3322 enum { COND, LHS, RHS, END_EXPR }; 3323 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3324 SourceLocation BuiltinLoc, RParenLoc; 3325public: 3326 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3327 QualType t, ExprValueKind VK, ExprObjectKind OK, 3328 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3329 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3330 (cond->isInstantiationDependent() || 3331 lhs->isInstantiationDependent() || 3332 rhs->isInstantiationDependent()), 3333 (cond->containsUnexpandedParameterPack() || 3334 lhs->containsUnexpandedParameterPack() || 3335 rhs->containsUnexpandedParameterPack())), 3336 BuiltinLoc(BLoc), RParenLoc(RP) { 3337 SubExprs[COND] = cond; 3338 SubExprs[LHS] = lhs; 3339 SubExprs[RHS] = rhs; 3340 } 3341 3342 /// \brief Build an empty __builtin_choose_expr. 3343 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3344 3345 /// isConditionTrue - Return whether the condition is true (i.e. not 3346 /// equal to zero). 3347 bool isConditionTrue(const ASTContext &C) const; 3348 3349 /// getChosenSubExpr - Return the subexpression chosen according to the 3350 /// condition. 3351 Expr *getChosenSubExpr(const ASTContext &C) const { 3352 return isConditionTrue(C) ? getLHS() : getRHS(); 3353 } 3354 3355 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3356 void setCond(Expr *E) { SubExprs[COND] = E; } 3357 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3358 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3359 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3360 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3361 3362 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3363 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3364 3365 SourceLocation getRParenLoc() const { return RParenLoc; } 3366 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3367 3368 SourceRange getSourceRange() const LLVM_READONLY { 3369 return SourceRange(BuiltinLoc, RParenLoc); 3370 } 3371 static bool classof(const Stmt *T) { 3372 return T->getStmtClass() == ChooseExprClass; 3373 } 3374 static bool classof(const ChooseExpr *) { return true; } 3375 3376 // Iterators 3377 child_range children() { 3378 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3379 } 3380}; 3381 3382/// GNUNullExpr - Implements the GNU __null extension, which is a name 3383/// for a null pointer constant that has integral type (e.g., int or 3384/// long) and is the same size and alignment as a pointer. The __null 3385/// extension is typically only used by system headers, which define 3386/// NULL as __null in C++ rather than using 0 (which is an integer 3387/// that may not match the size of a pointer). 3388class GNUNullExpr : public Expr { 3389 /// TokenLoc - The location of the __null keyword. 3390 SourceLocation TokenLoc; 3391 3392public: 3393 GNUNullExpr(QualType Ty, SourceLocation Loc) 3394 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false, 3395 false), 3396 TokenLoc(Loc) { } 3397 3398 /// \brief Build an empty GNU __null expression. 3399 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3400 3401 /// getTokenLocation - The location of the __null token. 3402 SourceLocation getTokenLocation() const { return TokenLoc; } 3403 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3404 3405 SourceRange getSourceRange() const LLVM_READONLY { 3406 return SourceRange(TokenLoc); 3407 } 3408 static bool classof(const Stmt *T) { 3409 return T->getStmtClass() == GNUNullExprClass; 3410 } 3411 static bool classof(const GNUNullExpr *) { return true; } 3412 3413 // Iterators 3414 child_range children() { return child_range(); } 3415}; 3416 3417/// VAArgExpr, used for the builtin function __builtin_va_arg. 3418class VAArgExpr : public Expr { 3419 Stmt *Val; 3420 TypeSourceInfo *TInfo; 3421 SourceLocation BuiltinLoc, RParenLoc; 3422public: 3423 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3424 SourceLocation RPLoc, QualType t) 3425 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3426 t->isDependentType(), false, 3427 (TInfo->getType()->isInstantiationDependentType() || 3428 e->isInstantiationDependent()), 3429 (TInfo->getType()->containsUnexpandedParameterPack() || 3430 e->containsUnexpandedParameterPack())), 3431 Val(e), TInfo(TInfo), 3432 BuiltinLoc(BLoc), 3433 RParenLoc(RPLoc) { } 3434 3435 /// \brief Create an empty __builtin_va_arg expression. 3436 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3437 3438 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3439 Expr *getSubExpr() { return cast<Expr>(Val); } 3440 void setSubExpr(Expr *E) { Val = E; } 3441 3442 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3443 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3444 3445 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3446 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3447 3448 SourceLocation getRParenLoc() const { return RParenLoc; } 3449 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3450 3451 SourceRange getSourceRange() const LLVM_READONLY { 3452 return SourceRange(BuiltinLoc, RParenLoc); 3453 } 3454 static bool classof(const Stmt *T) { 3455 return T->getStmtClass() == VAArgExprClass; 3456 } 3457 static bool classof(const VAArgExpr *) { return true; } 3458 3459 // Iterators 3460 child_range children() { return child_range(&Val, &Val+1); } 3461}; 3462 3463/// @brief Describes an C or C++ initializer list. 3464/// 3465/// InitListExpr describes an initializer list, which can be used to 3466/// initialize objects of different types, including 3467/// struct/class/union types, arrays, and vectors. For example: 3468/// 3469/// @code 3470/// struct foo x = { 1, { 2, 3 } }; 3471/// @endcode 3472/// 3473/// Prior to semantic analysis, an initializer list will represent the 3474/// initializer list as written by the user, but will have the 3475/// placeholder type "void". This initializer list is called the 3476/// syntactic form of the initializer, and may contain C99 designated 3477/// initializers (represented as DesignatedInitExprs), initializations 3478/// of subobject members without explicit braces, and so on. Clients 3479/// interested in the original syntax of the initializer list should 3480/// use the syntactic form of the initializer list. 3481/// 3482/// After semantic analysis, the initializer list will represent the 3483/// semantic form of the initializer, where the initializations of all 3484/// subobjects are made explicit with nested InitListExpr nodes and 3485/// C99 designators have been eliminated by placing the designated 3486/// initializations into the subobject they initialize. Additionally, 3487/// any "holes" in the initialization, where no initializer has been 3488/// specified for a particular subobject, will be replaced with 3489/// implicitly-generated ImplicitValueInitExpr expressions that 3490/// value-initialize the subobjects. Note, however, that the 3491/// initializer lists may still have fewer initializers than there are 3492/// elements to initialize within the object. 3493/// 3494/// Given the semantic form of the initializer list, one can retrieve 3495/// the original syntactic form of that initializer list (if it 3496/// exists) using getSyntacticForm(). Since many initializer lists 3497/// have the same syntactic and semantic forms, getSyntacticForm() may 3498/// return NULL, indicating that the current initializer list also 3499/// serves as its syntactic form. 3500class InitListExpr : public Expr { 3501 // FIXME: Eliminate this vector in favor of ASTContext allocation 3502 typedef ASTVector<Stmt *> InitExprsTy; 3503 InitExprsTy InitExprs; 3504 SourceLocation LBraceLoc, RBraceLoc; 3505 3506 /// Contains the initializer list that describes the syntactic form 3507 /// written in the source code. 3508 InitListExpr *SyntacticForm; 3509 3510 /// \brief Either: 3511 /// If this initializer list initializes an array with more elements than 3512 /// there are initializers in the list, specifies an expression to be used 3513 /// for value initialization of the rest of the elements. 3514 /// Or 3515 /// If this initializer list initializes a union, specifies which 3516 /// field within the union will be initialized. 3517 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3518 3519public: 3520 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3521 Expr **initexprs, unsigned numinits, 3522 SourceLocation rbraceloc); 3523 3524 /// \brief Build an empty initializer list. 3525 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3526 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3527 3528 unsigned getNumInits() const { return InitExprs.size(); } 3529 3530 /// \brief Retrieve the set of initializers. 3531 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3532 3533 const Expr *getInit(unsigned Init) const { 3534 assert(Init < getNumInits() && "Initializer access out of range!"); 3535 return cast_or_null<Expr>(InitExprs[Init]); 3536 } 3537 3538 Expr *getInit(unsigned Init) { 3539 assert(Init < getNumInits() && "Initializer access out of range!"); 3540 return cast_or_null<Expr>(InitExprs[Init]); 3541 } 3542 3543 void setInit(unsigned Init, Expr *expr) { 3544 assert(Init < getNumInits() && "Initializer access out of range!"); 3545 InitExprs[Init] = expr; 3546 } 3547 3548 /// \brief Reserve space for some number of initializers. 3549 void reserveInits(ASTContext &C, unsigned NumInits); 3550 3551 /// @brief Specify the number of initializers 3552 /// 3553 /// If there are more than @p NumInits initializers, the remaining 3554 /// initializers will be destroyed. If there are fewer than @p 3555 /// NumInits initializers, NULL expressions will be added for the 3556 /// unknown initializers. 3557 void resizeInits(ASTContext &Context, unsigned NumInits); 3558 3559 /// @brief Updates the initializer at index @p Init with the new 3560 /// expression @p expr, and returns the old expression at that 3561 /// location. 3562 /// 3563 /// When @p Init is out of range for this initializer list, the 3564 /// initializer list will be extended with NULL expressions to 3565 /// accommodate the new entry. 3566 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3567 3568 /// \brief If this initializer list initializes an array with more elements 3569 /// than there are initializers in the list, specifies an expression to be 3570 /// used for value initialization of the rest of the elements. 3571 Expr *getArrayFiller() { 3572 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3573 } 3574 const Expr *getArrayFiller() const { 3575 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3576 } 3577 void setArrayFiller(Expr *filler); 3578 3579 /// \brief Return true if this is an array initializer and its array "filler" 3580 /// has been set. 3581 bool hasArrayFiller() const { return getArrayFiller(); } 3582 3583 /// \brief If this initializes a union, specifies which field in the 3584 /// union to initialize. 3585 /// 3586 /// Typically, this field is the first named field within the 3587 /// union. However, a designated initializer can specify the 3588 /// initialization of a different field within the union. 3589 FieldDecl *getInitializedFieldInUnion() { 3590 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3591 } 3592 const FieldDecl *getInitializedFieldInUnion() const { 3593 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3594 } 3595 void setInitializedFieldInUnion(FieldDecl *FD) { 3596 ArrayFillerOrUnionFieldInit = FD; 3597 } 3598 3599 // Explicit InitListExpr's originate from source code (and have valid source 3600 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3601 bool isExplicit() { 3602 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3603 } 3604 3605 // Is this an initializer for an array of characters, initialized by a string 3606 // literal or an @encode? 3607 bool isStringLiteralInit() const; 3608 3609 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3610 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3611 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3612 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3613 3614 /// @brief Retrieve the initializer list that describes the 3615 /// syntactic form of the initializer. 3616 /// 3617 /// 3618 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3619 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3620 3621 bool hadArrayRangeDesignator() const { 3622 return InitListExprBits.HadArrayRangeDesignator != 0; 3623 } 3624 void sawArrayRangeDesignator(bool ARD = true) { 3625 InitListExprBits.HadArrayRangeDesignator = ARD; 3626 } 3627 3628 bool initializesStdInitializerList() const { 3629 return InitListExprBits.InitializesStdInitializerList != 0; 3630 } 3631 void setInitializesStdInitializerList(bool ISIL = true) { 3632 InitListExprBits.InitializesStdInitializerList = ISIL; 3633 } 3634 3635 SourceRange getSourceRange() const LLVM_READONLY; 3636 3637 static bool classof(const Stmt *T) { 3638 return T->getStmtClass() == InitListExprClass; 3639 } 3640 static bool classof(const InitListExpr *) { return true; } 3641 3642 // Iterators 3643 child_range children() { 3644 if (InitExprs.empty()) return child_range(); 3645 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3646 } 3647 3648 typedef InitExprsTy::iterator iterator; 3649 typedef InitExprsTy::const_iterator const_iterator; 3650 typedef InitExprsTy::reverse_iterator reverse_iterator; 3651 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3652 3653 iterator begin() { return InitExprs.begin(); } 3654 const_iterator begin() const { return InitExprs.begin(); } 3655 iterator end() { return InitExprs.end(); } 3656 const_iterator end() const { return InitExprs.end(); } 3657 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3658 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3659 reverse_iterator rend() { return InitExprs.rend(); } 3660 const_reverse_iterator rend() const { return InitExprs.rend(); } 3661 3662 friend class ASTStmtReader; 3663 friend class ASTStmtWriter; 3664}; 3665 3666/// @brief Represents a C99 designated initializer expression. 3667/// 3668/// A designated initializer expression (C99 6.7.8) contains one or 3669/// more designators (which can be field designators, array 3670/// designators, or GNU array-range designators) followed by an 3671/// expression that initializes the field or element(s) that the 3672/// designators refer to. For example, given: 3673/// 3674/// @code 3675/// struct point { 3676/// double x; 3677/// double y; 3678/// }; 3679/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3680/// @endcode 3681/// 3682/// The InitListExpr contains three DesignatedInitExprs, the first of 3683/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3684/// designators, one array designator for @c [2] followed by one field 3685/// designator for @c .y. The initalization expression will be 1.0. 3686class DesignatedInitExpr : public Expr { 3687public: 3688 /// \brief Forward declaration of the Designator class. 3689 class Designator; 3690 3691private: 3692 /// The location of the '=' or ':' prior to the actual initializer 3693 /// expression. 3694 SourceLocation EqualOrColonLoc; 3695 3696 /// Whether this designated initializer used the GNU deprecated 3697 /// syntax rather than the C99 '=' syntax. 3698 bool GNUSyntax : 1; 3699 3700 /// The number of designators in this initializer expression. 3701 unsigned NumDesignators : 15; 3702 3703 /// The number of subexpressions of this initializer expression, 3704 /// which contains both the initializer and any additional 3705 /// expressions used by array and array-range designators. 3706 unsigned NumSubExprs : 16; 3707 3708 /// \brief The designators in this designated initialization 3709 /// expression. 3710 Designator *Designators; 3711 3712 3713 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3714 const Designator *Designators, 3715 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3716 Expr **IndexExprs, unsigned NumIndexExprs, 3717 Expr *Init); 3718 3719 explicit DesignatedInitExpr(unsigned NumSubExprs) 3720 : Expr(DesignatedInitExprClass, EmptyShell()), 3721 NumDesignators(0), NumSubExprs(NumSubExprs), Designators(0) { } 3722 3723public: 3724 /// A field designator, e.g., ".x". 3725 struct FieldDesignator { 3726 /// Refers to the field that is being initialized. The low bit 3727 /// of this field determines whether this is actually a pointer 3728 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3729 /// initially constructed, a field designator will store an 3730 /// IdentifierInfo*. After semantic analysis has resolved that 3731 /// name, the field designator will instead store a FieldDecl*. 3732 uintptr_t NameOrField; 3733 3734 /// The location of the '.' in the designated initializer. 3735 unsigned DotLoc; 3736 3737 /// The location of the field name in the designated initializer. 3738 unsigned FieldLoc; 3739 }; 3740 3741 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3742 struct ArrayOrRangeDesignator { 3743 /// Location of the first index expression within the designated 3744 /// initializer expression's list of subexpressions. 3745 unsigned Index; 3746 /// The location of the '[' starting the array range designator. 3747 unsigned LBracketLoc; 3748 /// The location of the ellipsis separating the start and end 3749 /// indices. Only valid for GNU array-range designators. 3750 unsigned EllipsisLoc; 3751 /// The location of the ']' terminating the array range designator. 3752 unsigned RBracketLoc; 3753 }; 3754 3755 /// @brief Represents a single C99 designator. 3756 /// 3757 /// @todo This class is infuriatingly similar to clang::Designator, 3758 /// but minor differences (storing indices vs. storing pointers) 3759 /// keep us from reusing it. Try harder, later, to rectify these 3760 /// differences. 3761 class Designator { 3762 /// @brief The kind of designator this describes. 3763 enum { 3764 FieldDesignator, 3765 ArrayDesignator, 3766 ArrayRangeDesignator 3767 } Kind; 3768 3769 union { 3770 /// A field designator, e.g., ".x". 3771 struct FieldDesignator Field; 3772 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3773 struct ArrayOrRangeDesignator ArrayOrRange; 3774 }; 3775 friend class DesignatedInitExpr; 3776 3777 public: 3778 Designator() {} 3779 3780 /// @brief Initializes a field designator. 3781 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3782 SourceLocation FieldLoc) 3783 : Kind(FieldDesignator) { 3784 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3785 Field.DotLoc = DotLoc.getRawEncoding(); 3786 Field.FieldLoc = FieldLoc.getRawEncoding(); 3787 } 3788 3789 /// @brief Initializes an array designator. 3790 Designator(unsigned Index, SourceLocation LBracketLoc, 3791 SourceLocation RBracketLoc) 3792 : Kind(ArrayDesignator) { 3793 ArrayOrRange.Index = Index; 3794 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3795 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3796 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3797 } 3798 3799 /// @brief Initializes a GNU array-range designator. 3800 Designator(unsigned Index, SourceLocation LBracketLoc, 3801 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3802 : Kind(ArrayRangeDesignator) { 3803 ArrayOrRange.Index = Index; 3804 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3805 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3806 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3807 } 3808 3809 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3810 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3811 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3812 3813 IdentifierInfo *getFieldName() const; 3814 3815 FieldDecl *getField() const { 3816 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3817 if (Field.NameOrField & 0x01) 3818 return 0; 3819 else 3820 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3821 } 3822 3823 void setField(FieldDecl *FD) { 3824 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3825 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3826 } 3827 3828 SourceLocation getDotLoc() const { 3829 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3830 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3831 } 3832 3833 SourceLocation getFieldLoc() const { 3834 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3835 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3836 } 3837 3838 SourceLocation getLBracketLoc() const { 3839 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3840 "Only valid on an array or array-range designator"); 3841 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3842 } 3843 3844 SourceLocation getRBracketLoc() const { 3845 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3846 "Only valid on an array or array-range designator"); 3847 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3848 } 3849 3850 SourceLocation getEllipsisLoc() const { 3851 assert(Kind == ArrayRangeDesignator && 3852 "Only valid on an array-range designator"); 3853 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3854 } 3855 3856 unsigned getFirstExprIndex() const { 3857 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3858 "Only valid on an array or array-range designator"); 3859 return ArrayOrRange.Index; 3860 } 3861 3862 SourceLocation getStartLocation() const { 3863 if (Kind == FieldDesignator) 3864 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3865 else 3866 return getLBracketLoc(); 3867 } 3868 SourceLocation getEndLocation() const { 3869 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3870 } 3871 SourceRange getSourceRange() const LLVM_READONLY { 3872 return SourceRange(getStartLocation(), getEndLocation()); 3873 } 3874 }; 3875 3876 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3877 unsigned NumDesignators, 3878 Expr **IndexExprs, unsigned NumIndexExprs, 3879 SourceLocation EqualOrColonLoc, 3880 bool GNUSyntax, Expr *Init); 3881 3882 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3883 3884 /// @brief Returns the number of designators in this initializer. 3885 unsigned size() const { return NumDesignators; } 3886 3887 // Iterator access to the designators. 3888 typedef Designator *designators_iterator; 3889 designators_iterator designators_begin() { return Designators; } 3890 designators_iterator designators_end() { 3891 return Designators + NumDesignators; 3892 } 3893 3894 typedef const Designator *const_designators_iterator; 3895 const_designators_iterator designators_begin() const { return Designators; } 3896 const_designators_iterator designators_end() const { 3897 return Designators + NumDesignators; 3898 } 3899 3900 typedef std::reverse_iterator<designators_iterator> 3901 reverse_designators_iterator; 3902 reverse_designators_iterator designators_rbegin() { 3903 return reverse_designators_iterator(designators_end()); 3904 } 3905 reverse_designators_iterator designators_rend() { 3906 return reverse_designators_iterator(designators_begin()); 3907 } 3908 3909 typedef std::reverse_iterator<const_designators_iterator> 3910 const_reverse_designators_iterator; 3911 const_reverse_designators_iterator designators_rbegin() const { 3912 return const_reverse_designators_iterator(designators_end()); 3913 } 3914 const_reverse_designators_iterator designators_rend() const { 3915 return const_reverse_designators_iterator(designators_begin()); 3916 } 3917 3918 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3919 3920 void setDesignators(ASTContext &C, const Designator *Desigs, 3921 unsigned NumDesigs); 3922 3923 Expr *getArrayIndex(const Designator& D); 3924 Expr *getArrayRangeStart(const Designator& D); 3925 Expr *getArrayRangeEnd(const Designator& D); 3926 3927 /// @brief Retrieve the location of the '=' that precedes the 3928 /// initializer value itself, if present. 3929 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3930 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3931 3932 /// @brief Determines whether this designated initializer used the 3933 /// deprecated GNU syntax for designated initializers. 3934 bool usesGNUSyntax() const { return GNUSyntax; } 3935 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3936 3937 /// @brief Retrieve the initializer value. 3938 Expr *getInit() const { 3939 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3940 } 3941 3942 void setInit(Expr *init) { 3943 *child_begin() = init; 3944 } 3945 3946 /// \brief Retrieve the total number of subexpressions in this 3947 /// designated initializer expression, including the actual 3948 /// initialized value and any expressions that occur within array 3949 /// and array-range designators. 3950 unsigned getNumSubExprs() const { return NumSubExprs; } 3951 3952 Expr *getSubExpr(unsigned Idx) { 3953 assert(Idx < NumSubExprs && "Subscript out of range"); 3954 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3955 Ptr += sizeof(DesignatedInitExpr); 3956 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3957 } 3958 3959 void setSubExpr(unsigned Idx, Expr *E) { 3960 assert(Idx < NumSubExprs && "Subscript out of range"); 3961 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3962 Ptr += sizeof(DesignatedInitExpr); 3963 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3964 } 3965 3966 /// \brief Replaces the designator at index @p Idx with the series 3967 /// of designators in [First, Last). 3968 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3969 const Designator *Last); 3970 3971 SourceRange getDesignatorsSourceRange() const; 3972 3973 SourceRange getSourceRange() const LLVM_READONLY; 3974 3975 static bool classof(const Stmt *T) { 3976 return T->getStmtClass() == DesignatedInitExprClass; 3977 } 3978 static bool classof(const DesignatedInitExpr *) { return true; } 3979 3980 // Iterators 3981 child_range children() { 3982 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3983 return child_range(begin, begin + NumSubExprs); 3984 } 3985}; 3986 3987/// \brief Represents an implicitly-generated value initialization of 3988/// an object of a given type. 3989/// 3990/// Implicit value initializations occur within semantic initializer 3991/// list expressions (InitListExpr) as placeholders for subobject 3992/// initializations not explicitly specified by the user. 3993/// 3994/// \see InitListExpr 3995class ImplicitValueInitExpr : public Expr { 3996public: 3997 explicit ImplicitValueInitExpr(QualType ty) 3998 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3999 false, false, ty->isInstantiationDependentType(), false) { } 4000 4001 /// \brief Construct an empty implicit value initialization. 4002 explicit ImplicitValueInitExpr(EmptyShell Empty) 4003 : Expr(ImplicitValueInitExprClass, Empty) { } 4004 4005 static bool classof(const Stmt *T) { 4006 return T->getStmtClass() == ImplicitValueInitExprClass; 4007 } 4008 static bool classof(const ImplicitValueInitExpr *) { return true; } 4009 4010 SourceRange getSourceRange() const LLVM_READONLY { 4011 return SourceRange(); 4012 } 4013 4014 // Iterators 4015 child_range children() { return child_range(); } 4016}; 4017 4018 4019class ParenListExpr : public Expr { 4020 Stmt **Exprs; 4021 unsigned NumExprs; 4022 SourceLocation LParenLoc, RParenLoc; 4023 4024public: 4025 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 4026 unsigned numexprs, SourceLocation rparenloc); 4027 4028 /// \brief Build an empty paren list. 4029 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 4030 4031 unsigned getNumExprs() const { return NumExprs; } 4032 4033 const Expr* getExpr(unsigned Init) const { 4034 assert(Init < getNumExprs() && "Initializer access out of range!"); 4035 return cast_or_null<Expr>(Exprs[Init]); 4036 } 4037 4038 Expr* getExpr(unsigned Init) { 4039 assert(Init < getNumExprs() && "Initializer access out of range!"); 4040 return cast_or_null<Expr>(Exprs[Init]); 4041 } 4042 4043 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 4044 4045 SourceLocation getLParenLoc() const { return LParenLoc; } 4046 SourceLocation getRParenLoc() const { return RParenLoc; } 4047 4048 SourceRange getSourceRange() const LLVM_READONLY { 4049 return SourceRange(LParenLoc, RParenLoc); 4050 } 4051 static bool classof(const Stmt *T) { 4052 return T->getStmtClass() == ParenListExprClass; 4053 } 4054 static bool classof(const ParenListExpr *) { return true; } 4055 4056 // Iterators 4057 child_range children() { 4058 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 4059 } 4060 4061 friend class ASTStmtReader; 4062 friend class ASTStmtWriter; 4063}; 4064 4065 4066/// \brief Represents a C11 generic selection. 4067/// 4068/// A generic selection (C11 6.5.1.1) contains an unevaluated controlling 4069/// expression, followed by one or more generic associations. Each generic 4070/// association specifies a type name and an expression, or "default" and an 4071/// expression (in which case it is known as a default generic association). 4072/// The type and value of the generic selection are identical to those of its 4073/// result expression, which is defined as the expression in the generic 4074/// association with a type name that is compatible with the type of the 4075/// controlling expression, or the expression in the default generic association 4076/// if no types are compatible. For example: 4077/// 4078/// @code 4079/// _Generic(X, double: 1, float: 2, default: 3) 4080/// @endcode 4081/// 4082/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 4083/// or 3 if "hello". 4084/// 4085/// As an extension, generic selections are allowed in C++, where the following 4086/// additional semantics apply: 4087/// 4088/// Any generic selection whose controlling expression is type-dependent or 4089/// which names a dependent type in its association list is result-dependent, 4090/// which means that the choice of result expression is dependent. 4091/// Result-dependent generic associations are both type- and value-dependent. 4092class GenericSelectionExpr : public Expr { 4093 enum { CONTROLLING, END_EXPR }; 4094 TypeSourceInfo **AssocTypes; 4095 Stmt **SubExprs; 4096 unsigned NumAssocs, ResultIndex; 4097 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 4098 4099public: 4100 GenericSelectionExpr(ASTContext &Context, 4101 SourceLocation GenericLoc, Expr *ControllingExpr, 4102 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4103 unsigned NumAssocs, SourceLocation DefaultLoc, 4104 SourceLocation RParenLoc, 4105 bool ContainsUnexpandedParameterPack, 4106 unsigned ResultIndex); 4107 4108 /// This constructor is used in the result-dependent case. 4109 GenericSelectionExpr(ASTContext &Context, 4110 SourceLocation GenericLoc, Expr *ControllingExpr, 4111 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 4112 unsigned NumAssocs, SourceLocation DefaultLoc, 4113 SourceLocation RParenLoc, 4114 bool ContainsUnexpandedParameterPack); 4115 4116 explicit GenericSelectionExpr(EmptyShell Empty) 4117 : Expr(GenericSelectionExprClass, Empty) { } 4118 4119 unsigned getNumAssocs() const { return NumAssocs; } 4120 4121 SourceLocation getGenericLoc() const { return GenericLoc; } 4122 SourceLocation getDefaultLoc() const { return DefaultLoc; } 4123 SourceLocation getRParenLoc() const { return RParenLoc; } 4124 4125 const Expr *getAssocExpr(unsigned i) const { 4126 return cast<Expr>(SubExprs[END_EXPR+i]); 4127 } 4128 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 4129 4130 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 4131 return AssocTypes[i]; 4132 } 4133 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 4134 4135 QualType getAssocType(unsigned i) const { 4136 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 4137 return TS->getType(); 4138 else 4139 return QualType(); 4140 } 4141 4142 const Expr *getControllingExpr() const { 4143 return cast<Expr>(SubExprs[CONTROLLING]); 4144 } 4145 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 4146 4147 /// Whether this generic selection is result-dependent. 4148 bool isResultDependent() const { return ResultIndex == -1U; } 4149 4150 /// The zero-based index of the result expression's generic association in 4151 /// the generic selection's association list. Defined only if the 4152 /// generic selection is not result-dependent. 4153 unsigned getResultIndex() const { 4154 assert(!isResultDependent() && "Generic selection is result-dependent"); 4155 return ResultIndex; 4156 } 4157 4158 /// The generic selection's result expression. Defined only if the 4159 /// generic selection is not result-dependent. 4160 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 4161 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 4162 4163 SourceRange getSourceRange() const LLVM_READONLY { 4164 return SourceRange(GenericLoc, RParenLoc); 4165 } 4166 static bool classof(const Stmt *T) { 4167 return T->getStmtClass() == GenericSelectionExprClass; 4168 } 4169 static bool classof(const GenericSelectionExpr *) { return true; } 4170 4171 child_range children() { 4172 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 4173 } 4174 4175 friend class ASTStmtReader; 4176}; 4177 4178//===----------------------------------------------------------------------===// 4179// Clang Extensions 4180//===----------------------------------------------------------------------===// 4181 4182 4183/// ExtVectorElementExpr - This represents access to specific elements of a 4184/// vector, and may occur on the left hand side or right hand side. For example 4185/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 4186/// 4187/// Note that the base may have either vector or pointer to vector type, just 4188/// like a struct field reference. 4189/// 4190class ExtVectorElementExpr : public Expr { 4191 Stmt *Base; 4192 IdentifierInfo *Accessor; 4193 SourceLocation AccessorLoc; 4194public: 4195 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 4196 IdentifierInfo &accessor, SourceLocation loc) 4197 : Expr(ExtVectorElementExprClass, ty, VK, 4198 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 4199 base->isTypeDependent(), base->isValueDependent(), 4200 base->isInstantiationDependent(), 4201 base->containsUnexpandedParameterPack()), 4202 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 4203 4204 /// \brief Build an empty vector element expression. 4205 explicit ExtVectorElementExpr(EmptyShell Empty) 4206 : Expr(ExtVectorElementExprClass, Empty) { } 4207 4208 const Expr *getBase() const { return cast<Expr>(Base); } 4209 Expr *getBase() { return cast<Expr>(Base); } 4210 void setBase(Expr *E) { Base = E; } 4211 4212 IdentifierInfo &getAccessor() const { return *Accessor; } 4213 void setAccessor(IdentifierInfo *II) { Accessor = II; } 4214 4215 SourceLocation getAccessorLoc() const { return AccessorLoc; } 4216 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 4217 4218 /// getNumElements - Get the number of components being selected. 4219 unsigned getNumElements() const; 4220 4221 /// containsDuplicateElements - Return true if any element access is 4222 /// repeated. 4223 bool containsDuplicateElements() const; 4224 4225 /// getEncodedElementAccess - Encode the elements accessed into an llvm 4226 /// aggregate Constant of ConstantInt(s). 4227 void getEncodedElementAccess(SmallVectorImpl<unsigned> &Elts) const; 4228 4229 SourceRange getSourceRange() const LLVM_READONLY { 4230 return SourceRange(getBase()->getLocStart(), AccessorLoc); 4231 } 4232 4233 /// isArrow - Return true if the base expression is a pointer to vector, 4234 /// return false if the base expression is a vector. 4235 bool isArrow() const; 4236 4237 static bool classof(const Stmt *T) { 4238 return T->getStmtClass() == ExtVectorElementExprClass; 4239 } 4240 static bool classof(const ExtVectorElementExpr *) { return true; } 4241 4242 // Iterators 4243 child_range children() { return child_range(&Base, &Base+1); } 4244}; 4245 4246 4247/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 4248/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 4249class BlockExpr : public Expr { 4250protected: 4251 BlockDecl *TheBlock; 4252public: 4253 BlockExpr(BlockDecl *BD, QualType ty) 4254 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 4255 ty->isDependentType(), ty->isDependentType(), 4256 ty->isInstantiationDependentType() || BD->isDependentContext(), 4257 false), 4258 TheBlock(BD) {} 4259 4260 /// \brief Build an empty block expression. 4261 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 4262 4263 const BlockDecl *getBlockDecl() const { return TheBlock; } 4264 BlockDecl *getBlockDecl() { return TheBlock; } 4265 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 4266 4267 // Convenience functions for probing the underlying BlockDecl. 4268 SourceLocation getCaretLocation() const; 4269 const Stmt *getBody() const; 4270 Stmt *getBody(); 4271 4272 SourceRange getSourceRange() const LLVM_READONLY { 4273 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 4274 } 4275 4276 /// getFunctionType - Return the underlying function type for this block. 4277 const FunctionProtoType *getFunctionType() const; 4278 4279 static bool classof(const Stmt *T) { 4280 return T->getStmtClass() == BlockExprClass; 4281 } 4282 static bool classof(const BlockExpr *) { return true; } 4283 4284 // Iterators 4285 child_range children() { return child_range(); } 4286}; 4287 4288/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4289/// This AST node provides support for reinterpreting a type to another 4290/// type of the same size. 4291class AsTypeExpr : public Expr { // Should this be an ExplicitCastExpr? 4292private: 4293 Stmt *SrcExpr; 4294 SourceLocation BuiltinLoc, RParenLoc; 4295 4296 friend class ASTReader; 4297 friend class ASTStmtReader; 4298 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4299 4300public: 4301 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4302 ExprValueKind VK, ExprObjectKind OK, 4303 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4304 : Expr(AsTypeExprClass, DstType, VK, OK, 4305 DstType->isDependentType(), 4306 DstType->isDependentType() || SrcExpr->isValueDependent(), 4307 (DstType->isInstantiationDependentType() || 4308 SrcExpr->isInstantiationDependent()), 4309 (DstType->containsUnexpandedParameterPack() || 4310 SrcExpr->containsUnexpandedParameterPack())), 4311 SrcExpr(SrcExpr), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4312 4313 /// getSrcExpr - Return the Expr to be converted. 4314 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); } 4315 4316 /// getBuiltinLoc - Return the location of the __builtin_astype token. 4317 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4318 4319 /// getRParenLoc - Return the location of final right parenthesis. 4320 SourceLocation getRParenLoc() const { return RParenLoc; } 4321 4322 SourceRange getSourceRange() const LLVM_READONLY { 4323 return SourceRange(BuiltinLoc, RParenLoc); 4324 } 4325 4326 static bool classof(const Stmt *T) { 4327 return T->getStmtClass() == AsTypeExprClass; 4328 } 4329 static bool classof(const AsTypeExpr *) { return true; } 4330 4331 // Iterators 4332 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); } 4333}; 4334 4335/// PseudoObjectExpr - An expression which accesses a pseudo-object 4336/// l-value. A pseudo-object is an abstract object, accesses to which 4337/// are translated to calls. The pseudo-object expression has a 4338/// syntactic form, which shows how the expression was actually 4339/// written in the source code, and a semantic form, which is a series 4340/// of expressions to be executed in order which detail how the 4341/// operation is actually evaluated. Optionally, one of the semantic 4342/// forms may also provide a result value for the expression. 4343/// 4344/// If any of the semantic-form expressions is an OpaqueValueExpr, 4345/// that OVE is required to have a source expression, and it is bound 4346/// to the result of that source expression. Such OVEs may appear 4347/// only in subsequent semantic-form expressions and as 4348/// sub-expressions of the syntactic form. 4349/// 4350/// PseudoObjectExpr should be used only when an operation can be 4351/// usefully described in terms of fairly simple rewrite rules on 4352/// objects and functions that are meant to be used by end-developers. 4353/// For example, under the Itanium ABI, dynamic casts are implemented 4354/// as a call to a runtime function called __dynamic_cast; using this 4355/// class to describe that would be inappropriate because that call is 4356/// not really part of the user-visible semantics, and instead the 4357/// cast is properly reflected in the AST and IR-generation has been 4358/// taught to generate the call as necessary. In contrast, an 4359/// Objective-C property access is semantically defined to be 4360/// equivalent to a particular message send, and this is very much 4361/// part of the user model. The name of this class encourages this 4362/// modelling design. 4363class PseudoObjectExpr : public Expr { 4364 // PseudoObjectExprBits.NumSubExprs - The number of sub-expressions. 4365 // Always at least two, because the first sub-expression is the 4366 // syntactic form. 4367 4368 // PseudoObjectExprBits.ResultIndex - The index of the 4369 // sub-expression holding the result. 0 means the result is void, 4370 // which is unambiguous because it's the index of the syntactic 4371 // form. Note that this is therefore 1 higher than the value passed 4372 // in to Create, which is an index within the semantic forms. 4373 // Note also that ASTStmtWriter assumes this encoding. 4374 4375 Expr **getSubExprsBuffer() { return reinterpret_cast<Expr**>(this + 1); } 4376 const Expr * const *getSubExprsBuffer() const { 4377 return reinterpret_cast<const Expr * const *>(this + 1); 4378 } 4379 4380 friend class ASTStmtReader; 4381 4382 PseudoObjectExpr(QualType type, ExprValueKind VK, 4383 Expr *syntactic, ArrayRef<Expr*> semantic, 4384 unsigned resultIndex); 4385 4386 PseudoObjectExpr(EmptyShell shell, unsigned numSemanticExprs); 4387 4388 unsigned getNumSubExprs() const { 4389 return PseudoObjectExprBits.NumSubExprs; 4390 } 4391 4392public: 4393 /// NoResult - A value for the result index indicating that there is 4394 /// no semantic result. 4395 enum { NoResult = ~0U }; 4396 4397 static PseudoObjectExpr *Create(ASTContext &Context, Expr *syntactic, 4398 ArrayRef<Expr*> semantic, 4399 unsigned resultIndex); 4400 4401 static PseudoObjectExpr *Create(ASTContext &Context, EmptyShell shell, 4402 unsigned numSemanticExprs); 4403 4404 /// Return the syntactic form of this expression, i.e. the 4405 /// expression it actually looks like. Likely to be expressed in 4406 /// terms of OpaqueValueExprs bound in the semantic form. 4407 Expr *getSyntacticForm() { return getSubExprsBuffer()[0]; } 4408 const Expr *getSyntacticForm() const { return getSubExprsBuffer()[0]; } 4409 4410 /// Return the index of the result-bearing expression into the semantics 4411 /// expressions, or PseudoObjectExpr::NoResult if there is none. 4412 unsigned getResultExprIndex() const { 4413 if (PseudoObjectExprBits.ResultIndex == 0) return NoResult; 4414 return PseudoObjectExprBits.ResultIndex - 1; 4415 } 4416 4417 /// Return the result-bearing expression, or null if there is none. 4418 Expr *getResultExpr() { 4419 if (PseudoObjectExprBits.ResultIndex == 0) 4420 return 0; 4421 return getSubExprsBuffer()[PseudoObjectExprBits.ResultIndex]; 4422 } 4423 const Expr *getResultExpr() const { 4424 return const_cast<PseudoObjectExpr*>(this)->getResultExpr(); 4425 } 4426 4427 unsigned getNumSemanticExprs() const { return getNumSubExprs() - 1; } 4428 4429 typedef Expr * const *semantics_iterator; 4430 typedef const Expr * const *const_semantics_iterator; 4431 semantics_iterator semantics_begin() { 4432 return getSubExprsBuffer() + 1; 4433 } 4434 const_semantics_iterator semantics_begin() const { 4435 return getSubExprsBuffer() + 1; 4436 } 4437 semantics_iterator semantics_end() { 4438 return getSubExprsBuffer() + getNumSubExprs(); 4439 } 4440 const_semantics_iterator semantics_end() const { 4441 return getSubExprsBuffer() + getNumSubExprs(); 4442 } 4443 Expr *getSemanticExpr(unsigned index) { 4444 assert(index + 1 < getNumSubExprs()); 4445 return getSubExprsBuffer()[index + 1]; 4446 } 4447 const Expr *getSemanticExpr(unsigned index) const { 4448 return const_cast<PseudoObjectExpr*>(this)->getSemanticExpr(index); 4449 } 4450 4451 SourceLocation getExprLoc() const LLVM_READONLY { 4452 return getSyntacticForm()->getExprLoc(); 4453 } 4454 SourceRange getSourceRange() const LLVM_READONLY { 4455 return getSyntacticForm()->getSourceRange(); 4456 } 4457 4458 child_range children() { 4459 Stmt **cs = reinterpret_cast<Stmt**>(getSubExprsBuffer()); 4460 return child_range(cs, cs + getNumSubExprs()); 4461 } 4462 4463 static bool classof(const Stmt *T) { 4464 return T->getStmtClass() == PseudoObjectExprClass; 4465 } 4466 static bool classof(const PseudoObjectExpr *) { return true; } 4467}; 4468 4469/// AtomicExpr - Variadic atomic builtins: __atomic_exchange, __atomic_fetch_*, 4470/// __atomic_load, __atomic_store, and __atomic_compare_exchange_*, for the 4471/// similarly-named C++11 instructions, and __c11 variants for <stdatomic.h>. 4472/// All of these instructions take one primary pointer and at least one memory 4473/// order. 4474class AtomicExpr : public Expr { 4475public: 4476 enum AtomicOp { 4477#define BUILTIN(ID, TYPE, ATTRS) 4478#define ATOMIC_BUILTIN(ID, TYPE, ATTRS) AO ## ID, 4479#include "clang/Basic/Builtins.def" 4480 // Avoid trailing comma 4481 BI_First = 0 4482 }; 4483 4484private: 4485 enum { PTR, ORDER, VAL1, ORDER_FAIL, VAL2, WEAK, END_EXPR }; 4486 Stmt* SubExprs[END_EXPR]; 4487 unsigned NumSubExprs; 4488 SourceLocation BuiltinLoc, RParenLoc; 4489 AtomicOp Op; 4490 4491 friend class ASTStmtReader; 4492 4493public: 4494 AtomicExpr(SourceLocation BLoc, Expr **args, unsigned nexpr, QualType t, 4495 AtomicOp op, SourceLocation RP); 4496 4497 /// \brief Determine the number of arguments the specified atomic builtin 4498 /// should have. 4499 static unsigned getNumSubExprs(AtomicOp Op); 4500 4501 /// \brief Build an empty AtomicExpr. 4502 explicit AtomicExpr(EmptyShell Empty) : Expr(AtomicExprClass, Empty) { } 4503 4504 Expr *getPtr() const { 4505 return cast<Expr>(SubExprs[PTR]); 4506 } 4507 Expr *getOrder() const { 4508 return cast<Expr>(SubExprs[ORDER]); 4509 } 4510 Expr *getVal1() const { 4511 if (Op == AO__c11_atomic_init) 4512 return cast<Expr>(SubExprs[ORDER]); 4513 assert(NumSubExprs > VAL1); 4514 return cast<Expr>(SubExprs[VAL1]); 4515 } 4516 Expr *getOrderFail() const { 4517 assert(NumSubExprs > ORDER_FAIL); 4518 return cast<Expr>(SubExprs[ORDER_FAIL]); 4519 } 4520 Expr *getVal2() const { 4521 if (Op == AO__atomic_exchange) 4522 return cast<Expr>(SubExprs[ORDER_FAIL]); 4523 assert(NumSubExprs > VAL2); 4524 return cast<Expr>(SubExprs[VAL2]); 4525 } 4526 Expr *getWeak() const { 4527 assert(NumSubExprs > WEAK); 4528 return cast<Expr>(SubExprs[WEAK]); 4529 } 4530 4531 AtomicOp getOp() const { return Op; } 4532 unsigned getNumSubExprs() { return NumSubExprs; } 4533 4534 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 4535 4536 bool isVolatile() const { 4537 return getPtr()->getType()->getPointeeType().isVolatileQualified(); 4538 } 4539 4540 bool isCmpXChg() const { 4541 return getOp() == AO__c11_atomic_compare_exchange_strong || 4542 getOp() == AO__c11_atomic_compare_exchange_weak || 4543 getOp() == AO__atomic_compare_exchange || 4544 getOp() == AO__atomic_compare_exchange_n; 4545 } 4546 4547 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 4548 SourceLocation getRParenLoc() const { return RParenLoc; } 4549 4550 SourceRange getSourceRange() const LLVM_READONLY { 4551 return SourceRange(BuiltinLoc, RParenLoc); 4552 } 4553 static bool classof(const Stmt *T) { 4554 return T->getStmtClass() == AtomicExprClass; 4555 } 4556 static bool classof(const AtomicExpr *) { return true; } 4557 4558 // Iterators 4559 child_range children() { 4560 return child_range(SubExprs, SubExprs+NumSubExprs); 4561 } 4562}; 4563} // end namespace clang 4564 4565#endif 4566