Expr.h revision f85e193739c953358c865005855253af4f68a497
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "clang/AST/DeclAccessPair.h" 21#include "clang/AST/OperationKinds.h" 22#include "clang/AST/ASTVector.h" 23#include "clang/AST/UsuallyTinyPtrVector.h" 24#include "clang/Basic/TypeTraits.h" 25#include "llvm/ADT/APSInt.h" 26#include "llvm/ADT/APFloat.h" 27#include "llvm/ADT/SmallVector.h" 28#include "llvm/ADT/StringRef.h" 29#include <cctype> 30 31namespace clang { 32 class ASTContext; 33 class APValue; 34 class Decl; 35 class IdentifierInfo; 36 class ParmVarDecl; 37 class NamedDecl; 38 class ValueDecl; 39 class BlockDecl; 40 class CXXBaseSpecifier; 41 class CXXOperatorCallExpr; 42 class CXXMemberCallExpr; 43 class ObjCPropertyRefExpr; 44 class TemplateArgumentLoc; 45 class TemplateArgumentListInfo; 46 class OpaqueValueExpr; 47 48/// \brief A simple array of base specifiers. 49typedef llvm::SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 50 51/// Expr - This represents one expression. Note that Expr's are subclasses of 52/// Stmt. This allows an expression to be transparently used any place a Stmt 53/// is required. 54/// 55class Expr : public Stmt { 56 QualType TR; 57 58protected: 59 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK, 60 bool TD, bool VD, bool ContainsUnexpandedParameterPack) : Stmt(SC) { 61 ExprBits.TypeDependent = TD; 62 ExprBits.ValueDependent = VD; 63 ExprBits.ValueKind = VK; 64 ExprBits.ObjectKind = OK; 65 ExprBits.ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack; 66 setType(T); 67 } 68 69 /// \brief Construct an empty expression. 70 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 71 72public: 73 QualType getType() const { return TR; } 74 void setType(QualType t) { 75 // In C++, the type of an expression is always adjusted so that it 76 // will not have reference type an expression will never have 77 // reference type (C++ [expr]p6). Use 78 // QualType::getNonReferenceType() to retrieve the non-reference 79 // type. Additionally, inspect Expr::isLvalue to determine whether 80 // an expression that is adjusted in this manner should be 81 // considered an lvalue. 82 assert((t.isNull() || !t->isReferenceType()) && 83 "Expressions can't have reference type"); 84 85 TR = t; 86 } 87 88 /// isValueDependent - Determines whether this expression is 89 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 90 /// array bound of "Chars" in the following example is 91 /// value-dependent. 92 /// @code 93 /// template<int Size, char (&Chars)[Size]> struct meta_string; 94 /// @endcode 95 bool isValueDependent() const { return ExprBits.ValueDependent; } 96 97 /// \brief Set whether this expression is value-dependent or not. 98 void setValueDependent(bool VD) { ExprBits.ValueDependent = VD; } 99 100 /// isTypeDependent - Determines whether this expression is 101 /// type-dependent (C++ [temp.dep.expr]), which means that its type 102 /// could change from one template instantiation to the next. For 103 /// example, the expressions "x" and "x + y" are type-dependent in 104 /// the following code, but "y" is not type-dependent: 105 /// @code 106 /// template<typename T> 107 /// void add(T x, int y) { 108 /// x + y; 109 /// } 110 /// @endcode 111 bool isTypeDependent() const { return ExprBits.TypeDependent; } 112 113 /// \brief Set whether this expression is type-dependent or not. 114 void setTypeDependent(bool TD) { ExprBits.TypeDependent = TD; } 115 116 /// \brief Whether this expression contains an unexpanded parameter 117 /// pack (for C++0x variadic templates). 118 /// 119 /// Given the following function template: 120 /// 121 /// \code 122 /// template<typename F, typename ...Types> 123 /// void forward(const F &f, Types &&...args) { 124 /// f(static_cast<Types&&>(args)...); 125 /// } 126 /// \endcode 127 /// 128 /// The expressions \c args and \c static_cast<Types&&>(args) both 129 /// contain parameter packs. 130 bool containsUnexpandedParameterPack() const { 131 return ExprBits.ContainsUnexpandedParameterPack; 132 } 133 134 /// \brief Set the bit that describes whether this expression 135 /// contains an unexpanded parameter pack. 136 void setContainsUnexpandedParameterPack(bool PP = true) { 137 ExprBits.ContainsUnexpandedParameterPack = PP; 138 } 139 140 /// getExprLoc - Return the preferred location for the arrow when diagnosing 141 /// a problem with a generic expression. 142 SourceLocation getExprLoc() const; 143 144 /// isUnusedResultAWarning - Return true if this immediate expression should 145 /// be warned about if the result is unused. If so, fill in Loc and Ranges 146 /// with location to warn on and the source range[s] to report with the 147 /// warning. 148 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 149 SourceRange &R2, ASTContext &Ctx) const; 150 151 /// isLValue - True if this expression is an "l-value" according to 152 /// the rules of the current language. C and C++ give somewhat 153 /// different rules for this concept, but in general, the result of 154 /// an l-value expression identifies a specific object whereas the 155 /// result of an r-value expression is a value detached from any 156 /// specific storage. 157 /// 158 /// C++0x divides the concept of "r-value" into pure r-values 159 /// ("pr-values") and so-called expiring values ("x-values"), which 160 /// identify specific objects that can be safely cannibalized for 161 /// their resources. This is an unfortunate abuse of terminology on 162 /// the part of the C++ committee. In Clang, when we say "r-value", 163 /// we generally mean a pr-value. 164 bool isLValue() const { return getValueKind() == VK_LValue; } 165 bool isRValue() const { return getValueKind() == VK_RValue; } 166 bool isXValue() const { return getValueKind() == VK_XValue; } 167 bool isGLValue() const { return getValueKind() != VK_RValue; } 168 169 enum LValueClassification { 170 LV_Valid, 171 LV_NotObjectType, 172 LV_IncompleteVoidType, 173 LV_DuplicateVectorComponents, 174 LV_InvalidExpression, 175 LV_InvalidMessageExpression, 176 LV_MemberFunction, 177 LV_SubObjCPropertySetting, 178 LV_ClassTemporary 179 }; 180 /// Reasons why an expression might not be an l-value. 181 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 182 183 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 184 /// does not have an incomplete type, does not have a const-qualified type, 185 /// and if it is a structure or union, does not have any member (including, 186 /// recursively, any member or element of all contained aggregates or unions) 187 /// with a const-qualified type. 188 /// 189 /// \param Loc [in] [out] - A source location which *may* be filled 190 /// in with the location of the expression making this a 191 /// non-modifiable lvalue, if specified. 192 enum isModifiableLvalueResult { 193 MLV_Valid, 194 MLV_NotObjectType, 195 MLV_IncompleteVoidType, 196 MLV_DuplicateVectorComponents, 197 MLV_InvalidExpression, 198 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 199 MLV_IncompleteType, 200 MLV_ConstQualified, 201 MLV_ArrayType, 202 MLV_NotBlockQualified, 203 MLV_ReadonlyProperty, 204 MLV_NoSetterProperty, 205 MLV_MemberFunction, 206 MLV_SubObjCPropertySetting, 207 MLV_InvalidMessageExpression, 208 MLV_ClassTemporary 209 }; 210 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 211 SourceLocation *Loc = 0) const; 212 213 /// \brief The return type of classify(). Represents the C++0x expression 214 /// taxonomy. 215 class Classification { 216 public: 217 /// \brief The various classification results. Most of these mean prvalue. 218 enum Kinds { 219 CL_LValue, 220 CL_XValue, 221 CL_Function, // Functions cannot be lvalues in C. 222 CL_Void, // Void cannot be an lvalue in C. 223 CL_AddressableVoid, // Void expression whose address can be taken in C. 224 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 225 CL_MemberFunction, // An expression referring to a member function 226 CL_SubObjCPropertySetting, 227 CL_ClassTemporary, // A prvalue of class type 228 CL_ObjCMessageRValue, // ObjC message is an rvalue 229 CL_PRValue // A prvalue for any other reason, of any other type 230 }; 231 /// \brief The results of modification testing. 232 enum ModifiableType { 233 CM_Untested, // testModifiable was false. 234 CM_Modifiable, 235 CM_RValue, // Not modifiable because it's an rvalue 236 CM_Function, // Not modifiable because it's a function; C++ only 237 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 238 CM_NotBlockQualified, // Not captured in the closure 239 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 240 CM_ConstQualified, 241 CM_ArrayType, 242 CM_IncompleteType 243 }; 244 245 private: 246 friend class Expr; 247 248 unsigned short Kind; 249 unsigned short Modifiable; 250 251 explicit Classification(Kinds k, ModifiableType m) 252 : Kind(k), Modifiable(m) 253 {} 254 255 public: 256 Classification() {} 257 258 Kinds getKind() const { return static_cast<Kinds>(Kind); } 259 ModifiableType getModifiable() const { 260 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 261 return static_cast<ModifiableType>(Modifiable); 262 } 263 bool isLValue() const { return Kind == CL_LValue; } 264 bool isXValue() const { return Kind == CL_XValue; } 265 bool isGLValue() const { return Kind <= CL_XValue; } 266 bool isPRValue() const { return Kind >= CL_Function; } 267 bool isRValue() const { return Kind >= CL_XValue; } 268 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 269 270 /// \brief Create a simple, modifiably lvalue 271 static Classification makeSimpleLValue() { 272 return Classification(CL_LValue, CM_Modifiable); 273 } 274 275 }; 276 /// \brief Classify - Classify this expression according to the C++0x 277 /// expression taxonomy. 278 /// 279 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 280 /// old lvalue vs rvalue. This function determines the type of expression this 281 /// is. There are three expression types: 282 /// - lvalues are classical lvalues as in C++03. 283 /// - prvalues are equivalent to rvalues in C++03. 284 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 285 /// function returning an rvalue reference. 286 /// lvalues and xvalues are collectively referred to as glvalues, while 287 /// prvalues and xvalues together form rvalues. 288 Classification Classify(ASTContext &Ctx) const { 289 return ClassifyImpl(Ctx, 0); 290 } 291 292 /// \brief ClassifyModifiable - Classify this expression according to the 293 /// C++0x expression taxonomy, and see if it is valid on the left side 294 /// of an assignment. 295 /// 296 /// This function extends classify in that it also tests whether the 297 /// expression is modifiable (C99 6.3.2.1p1). 298 /// \param Loc A source location that might be filled with a relevant location 299 /// if the expression is not modifiable. 300 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 301 return ClassifyImpl(Ctx, &Loc); 302 } 303 304 /// getValueKindForType - Given a formal return or parameter type, 305 /// give its value kind. 306 static ExprValueKind getValueKindForType(QualType T) { 307 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 308 return (isa<LValueReferenceType>(RT) 309 ? VK_LValue 310 : (RT->getPointeeType()->isFunctionType() 311 ? VK_LValue : VK_XValue)); 312 return VK_RValue; 313 } 314 315 /// getValueKind - The value kind that this expression produces. 316 ExprValueKind getValueKind() const { 317 return static_cast<ExprValueKind>(ExprBits.ValueKind); 318 } 319 320 /// getObjectKind - The object kind that this expression produces. 321 /// Object kinds are meaningful only for expressions that yield an 322 /// l-value or x-value. 323 ExprObjectKind getObjectKind() const { 324 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 325 } 326 327 bool isOrdinaryOrBitFieldObject() const { 328 ExprObjectKind OK = getObjectKind(); 329 return (OK == OK_Ordinary || OK == OK_BitField); 330 } 331 332 /// setValueKind - Set the value kind produced by this expression. 333 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 334 335 /// setObjectKind - Set the object kind produced by this expression. 336 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 337 338private: 339 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 340 341public: 342 343 /// \brief If this expression refers to a bit-field, retrieve the 344 /// declaration of that bit-field. 345 FieldDecl *getBitField(); 346 347 const FieldDecl *getBitField() const { 348 return const_cast<Expr*>(this)->getBitField(); 349 } 350 351 /// \brief If this expression is an l-value for an Objective C 352 /// property, find the underlying property reference expression. 353 const ObjCPropertyRefExpr *getObjCProperty() const; 354 355 /// \brief Returns whether this expression refers to a vector element. 356 bool refersToVectorElement() const; 357 358 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 359 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 360 /// but also int expressions which are produced by things like comparisons in 361 /// C. 362 bool isKnownToHaveBooleanValue() const; 363 364 /// isIntegerConstantExpr - Return true if this expression is a valid integer 365 /// constant expression, and, if so, return its value in Result. If not a 366 /// valid i-c-e, return false and fill in Loc (if specified) with the location 367 /// of the invalid expression. 368 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 369 SourceLocation *Loc = 0, 370 bool isEvaluated = true) const; 371 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 372 llvm::APSInt X; 373 return isIntegerConstantExpr(X, Ctx, Loc); 374 } 375 /// isConstantInitializer - Returns true if this expression is a constant 376 /// initializer, which can be emitted at compile-time. 377 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 378 379 /// EvalResult is a struct with detailed info about an evaluated expression. 380 struct EvalResult { 381 /// Val - This is the value the expression can be folded to. 382 APValue Val; 383 384 /// HasSideEffects - Whether the evaluated expression has side effects. 385 /// For example, (f() && 0) can be folded, but it still has side effects. 386 bool HasSideEffects; 387 388 /// Diag - If the expression is unfoldable, then Diag contains a note 389 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 390 /// position for the error, and DiagExpr is the expression that caused 391 /// the error. 392 /// If the expression is foldable, but not an integer constant expression, 393 /// Diag contains a note diagnostic that describes why it isn't an integer 394 /// constant expression. If the expression *is* an integer constant 395 /// expression, then Diag will be zero. 396 unsigned Diag; 397 const Expr *DiagExpr; 398 SourceLocation DiagLoc; 399 400 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 401 402 // isGlobalLValue - Return true if the evaluated lvalue expression 403 // is global. 404 bool isGlobalLValue() const; 405 // hasSideEffects - Return true if the evaluated expression has 406 // side effects. 407 bool hasSideEffects() const { 408 return HasSideEffects; 409 } 410 }; 411 412 /// Evaluate - Return true if this is a constant which we can fold using 413 /// any crazy technique (that has nothing to do with language standards) that 414 /// we want to. If this function returns true, it returns the folded constant 415 /// in Result. 416 bool Evaluate(EvalResult &Result, const ASTContext &Ctx) const; 417 418 /// EvaluateAsBooleanCondition - Return true if this is a constant 419 /// which we we can fold and convert to a boolean condition using 420 /// any crazy technique that we want to. 421 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 422 423 /// isEvaluatable - Call Evaluate to see if this expression can be constant 424 /// folded, but discard the result. 425 bool isEvaluatable(const ASTContext &Ctx) const; 426 427 /// HasSideEffects - This routine returns true for all those expressions 428 /// which must be evaluated each time and must not be optimized away 429 /// or evaluated at compile time. Example is a function call, volatile 430 /// variable read. 431 bool HasSideEffects(const ASTContext &Ctx) const; 432 433 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 434 /// must be called on an expression that constant folds to an integer. 435 llvm::APSInt EvaluateAsInt(const ASTContext &Ctx) const; 436 437 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 438 /// with link time known address. 439 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 440 441 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue. 442 bool EvaluateAsAnyLValue(EvalResult &Result, const ASTContext &Ctx) const; 443 444 /// \brief Enumeration used to describe the kind of Null pointer constant 445 /// returned from \c isNullPointerConstant(). 446 enum NullPointerConstantKind { 447 /// \brief Expression is not a Null pointer constant. 448 NPCK_NotNull = 0, 449 450 /// \brief Expression is a Null pointer constant built from a zero integer. 451 NPCK_ZeroInteger, 452 453 /// \brief Expression is a C++0X nullptr. 454 NPCK_CXX0X_nullptr, 455 456 /// \brief Expression is a GNU-style __null constant. 457 NPCK_GNUNull 458 }; 459 460 /// \brief Enumeration used to describe how \c isNullPointerConstant() 461 /// should cope with value-dependent expressions. 462 enum NullPointerConstantValueDependence { 463 /// \brief Specifies that the expression should never be value-dependent. 464 NPC_NeverValueDependent = 0, 465 466 /// \brief Specifies that a value-dependent expression of integral or 467 /// dependent type should be considered a null pointer constant. 468 NPC_ValueDependentIsNull, 469 470 /// \brief Specifies that a value-dependent expression should be considered 471 /// to never be a null pointer constant. 472 NPC_ValueDependentIsNotNull 473 }; 474 475 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to 476 /// a Null pointer constant. The return value can further distinguish the 477 /// kind of NULL pointer constant that was detected. 478 NullPointerConstantKind isNullPointerConstant( 479 ASTContext &Ctx, 480 NullPointerConstantValueDependence NPC) const; 481 482 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 483 /// write barrier. 484 bool isOBJCGCCandidate(ASTContext &Ctx) const; 485 486 /// \brief Returns true if this expression is a bound member function. 487 bool isBoundMemberFunction(ASTContext &Ctx) const; 488 489 /// \brief Given an expression of bound-member type, find the type 490 /// of the member. Returns null if this is an *overloaded* bound 491 /// member expression. 492 static QualType findBoundMemberType(const Expr *expr); 493 494 /// \brief Result type of CanThrow(). 495 enum CanThrowResult { 496 CT_Cannot, 497 CT_Dependent, 498 CT_Can 499 }; 500 /// \brief Test if this expression, if evaluated, might throw, according to 501 /// the rules of C++ [expr.unary.noexcept]. 502 CanThrowResult CanThrow(ASTContext &C) const; 503 504 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 505 /// its subexpression. If that subexpression is also a ParenExpr, 506 /// then this method recursively returns its subexpression, and so forth. 507 /// Otherwise, the method returns the current Expr. 508 Expr *IgnoreParens(); 509 510 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 511 /// or CastExprs, returning their operand. 512 Expr *IgnoreParenCasts(); 513 514 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 515 /// ParenExpr or ImplicitCastExprs, returning their operand. 516 Expr *IgnoreParenImpCasts(); 517 518 /// IgnoreConversionOperator - Ignore conversion operator. If this Expr is a 519 /// call to a conversion operator, return the argument. 520 Expr *IgnoreConversionOperator(); 521 522 const Expr *IgnoreConversionOperator() const { 523 return const_cast<Expr*>(this)->IgnoreConversionOperator(); 524 } 525 526 const Expr *IgnoreParenImpCasts() const { 527 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 528 } 529 530 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 531 /// CastExprs that represent lvalue casts, returning their operand. 532 Expr *IgnoreParenLValueCasts(); 533 534 const Expr *IgnoreParenLValueCasts() const { 535 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 536 } 537 538 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 539 /// value (including ptr->int casts of the same size). Strip off any 540 /// ParenExpr or CastExprs, returning their operand. 541 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 542 543 /// \brief Determine whether this expression is a default function argument. 544 /// 545 /// Default arguments are implicitly generated in the abstract syntax tree 546 /// by semantic analysis for function calls, object constructions, etc. in 547 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 548 /// this routine also looks through any implicit casts to determine whether 549 /// the expression is a default argument. 550 bool isDefaultArgument() const; 551 552 /// \brief Determine whether the result of this expression is a 553 /// temporary object of the given class type. 554 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 555 556 /// \brief Whether this expression is an implicit reference to 'this' in C++. 557 bool isImplicitCXXThis() const; 558 559 const Expr *IgnoreParens() const { 560 return const_cast<Expr*>(this)->IgnoreParens(); 561 } 562 const Expr *IgnoreParenCasts() const { 563 return const_cast<Expr*>(this)->IgnoreParenCasts(); 564 } 565 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 566 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 567 } 568 569 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 570 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 571 572 static bool classof(const Stmt *T) { 573 return T->getStmtClass() >= firstExprConstant && 574 T->getStmtClass() <= lastExprConstant; 575 } 576 static bool classof(const Expr *) { return true; } 577}; 578 579 580//===----------------------------------------------------------------------===// 581// Primary Expressions. 582//===----------------------------------------------------------------------===// 583 584/// OpaqueValueExpr - An expression referring to an opaque object of a 585/// fixed type and value class. These don't correspond to concrete 586/// syntax; instead they're used to express operations (usually copy 587/// operations) on values whose source is generally obvious from 588/// context. 589class OpaqueValueExpr : public Expr { 590 friend class ASTStmtReader; 591 Expr *SourceExpr; 592 SourceLocation Loc; 593 594public: 595 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 596 ExprObjectKind OK = OK_Ordinary) 597 : Expr(OpaqueValueExprClass, T, VK, OK, 598 T->isDependentType(), T->isDependentType(), false), 599 SourceExpr(0), Loc(Loc) { 600 } 601 602 /// Given an expression which invokes a copy constructor --- i.e. a 603 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 604 /// find the OpaqueValueExpr that's the source of the construction. 605 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 606 607 explicit OpaqueValueExpr(EmptyShell Empty) 608 : Expr(OpaqueValueExprClass, Empty) { } 609 610 /// \brief Retrieve the location of this expression. 611 SourceLocation getLocation() const { return Loc; } 612 613 SourceRange getSourceRange() const { 614 if (SourceExpr) return SourceExpr->getSourceRange(); 615 return Loc; 616 } 617 SourceLocation getExprLoc() const { 618 if (SourceExpr) return SourceExpr->getExprLoc(); 619 return Loc; 620 } 621 622 child_range children() { return child_range(); } 623 624 /// The source expression of an opaque value expression is the 625 /// expression which originally generated the value. This is 626 /// provided as a convenience for analyses that don't wish to 627 /// precisely model the execution behavior of the program. 628 /// 629 /// The source expression is typically set when building the 630 /// expression which binds the opaque value expression in the first 631 /// place. 632 Expr *getSourceExpr() const { return SourceExpr; } 633 void setSourceExpr(Expr *e) { SourceExpr = e; } 634 635 static bool classof(const Stmt *T) { 636 return T->getStmtClass() == OpaqueValueExprClass; 637 } 638 static bool classof(const OpaqueValueExpr *) { return true; } 639}; 640 641/// \brief Represents an explicit template argument list in C++, e.g., 642/// the "<int>" in "sort<int>". 643struct ExplicitTemplateArgumentList { 644 /// \brief The source location of the left angle bracket ('<'); 645 SourceLocation LAngleLoc; 646 647 /// \brief The source location of the right angle bracket ('>'); 648 SourceLocation RAngleLoc; 649 650 /// \brief The number of template arguments in TemplateArgs. 651 /// The actual template arguments (if any) are stored after the 652 /// ExplicitTemplateArgumentList structure. 653 unsigned NumTemplateArgs; 654 655 /// \brief Retrieve the template arguments 656 TemplateArgumentLoc *getTemplateArgs() { 657 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 658 } 659 660 /// \brief Retrieve the template arguments 661 const TemplateArgumentLoc *getTemplateArgs() const { 662 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 663 } 664 665 void initializeFrom(const TemplateArgumentListInfo &List); 666 void initializeFrom(const TemplateArgumentListInfo &List, 667 bool &Dependent, bool &ContainsUnexpandedParameterPack); 668 void copyInto(TemplateArgumentListInfo &List) const; 669 static std::size_t sizeFor(unsigned NumTemplateArgs); 670 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 671}; 672 673/// \brief A reference to a declared variable, function, enum, etc. 674/// [C99 6.5.1p2] 675/// 676/// This encodes all the information about how a declaration is referenced 677/// within an expression. 678/// 679/// There are several optional constructs attached to DeclRefExprs only when 680/// they apply in order to conserve memory. These are laid out past the end of 681/// the object, and flags in the DeclRefExprBitfield track whether they exist: 682/// 683/// DeclRefExprBits.HasQualifier: 684/// Specifies when this declaration reference expression has a C++ 685/// nested-name-specifier. 686/// DeclRefExprBits.HasFoundDecl: 687/// Specifies when this declaration reference expression has a record of 688/// a NamedDecl (different from the referenced ValueDecl) which was found 689/// during name lookup and/or overload resolution. 690/// DeclRefExprBits.HasExplicitTemplateArgs: 691/// Specifies when this declaration reference expression has an explicit 692/// C++ template argument list. 693class DeclRefExpr : public Expr { 694 /// \brief The declaration that we are referencing. 695 ValueDecl *D; 696 697 /// \brief The location of the declaration name itself. 698 SourceLocation Loc; 699 700 /// \brief Provides source/type location info for the declaration name 701 /// embedded in D. 702 DeclarationNameLoc DNLoc; 703 704 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 705 NestedNameSpecifierLoc &getInternalQualifierLoc() { 706 assert(hasQualifier()); 707 return *reinterpret_cast<NestedNameSpecifierLoc *>(this + 1); 708 } 709 710 /// \brief Helper to retrieve the optional NestedNameSpecifierLoc. 711 const NestedNameSpecifierLoc &getInternalQualifierLoc() const { 712 return const_cast<DeclRefExpr *>(this)->getInternalQualifierLoc(); 713 } 714 715 /// \brief Test whether there is a distinct FoundDecl attached to the end of 716 /// this DRE. 717 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; } 718 719 /// \brief Helper to retrieve the optional NamedDecl through which this 720 /// reference occured. 721 NamedDecl *&getInternalFoundDecl() { 722 assert(hasFoundDecl()); 723 if (hasQualifier()) 724 return *reinterpret_cast<NamedDecl **>(&getInternalQualifierLoc() + 1); 725 return *reinterpret_cast<NamedDecl **>(this + 1); 726 } 727 728 /// \brief Helper to retrieve the optional NamedDecl through which this 729 /// reference occured. 730 NamedDecl *getInternalFoundDecl() const { 731 return const_cast<DeclRefExpr *>(this)->getInternalFoundDecl(); 732 } 733 734 DeclRefExpr(NestedNameSpecifierLoc QualifierLoc, 735 ValueDecl *D, const DeclarationNameInfo &NameInfo, 736 NamedDecl *FoundD, 737 const TemplateArgumentListInfo *TemplateArgs, 738 QualType T, ExprValueKind VK); 739 740 /// \brief Construct an empty declaration reference expression. 741 explicit DeclRefExpr(EmptyShell Empty) 742 : Expr(DeclRefExprClass, Empty) { } 743 744 /// \brief Computes the type- and value-dependence flags for this 745 /// declaration reference expression. 746 void computeDependence(); 747 748public: 749 DeclRefExpr(ValueDecl *D, QualType T, ExprValueKind VK, SourceLocation L) 750 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false, false), 751 D(D), Loc(L) { 752 DeclRefExprBits.HasQualifier = 0; 753 DeclRefExprBits.HasExplicitTemplateArgs = 0; 754 DeclRefExprBits.HasFoundDecl = 0; 755 computeDependence(); 756 } 757 758 static DeclRefExpr *Create(ASTContext &Context, 759 NestedNameSpecifierLoc QualifierLoc, 760 ValueDecl *D, 761 SourceLocation NameLoc, 762 QualType T, ExprValueKind VK, 763 NamedDecl *FoundD = 0, 764 const TemplateArgumentListInfo *TemplateArgs = 0); 765 766 static DeclRefExpr *Create(ASTContext &Context, 767 NestedNameSpecifierLoc QualifierLoc, 768 ValueDecl *D, 769 const DeclarationNameInfo &NameInfo, 770 QualType T, ExprValueKind VK, 771 NamedDecl *FoundD = 0, 772 const TemplateArgumentListInfo *TemplateArgs = 0); 773 774 /// \brief Construct an empty declaration reference expression. 775 static DeclRefExpr *CreateEmpty(ASTContext &Context, 776 bool HasQualifier, 777 bool HasFoundDecl, 778 bool HasExplicitTemplateArgs, 779 unsigned NumTemplateArgs); 780 781 ValueDecl *getDecl() { return D; } 782 const ValueDecl *getDecl() const { return D; } 783 void setDecl(ValueDecl *NewD) { D = NewD; } 784 785 DeclarationNameInfo getNameInfo() const { 786 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 787 } 788 789 SourceLocation getLocation() const { return Loc; } 790 void setLocation(SourceLocation L) { Loc = L; } 791 SourceRange getSourceRange() const; 792 793 /// \brief Determine whether this declaration reference was preceded by a 794 /// C++ nested-name-specifier, e.g., \c N::foo. 795 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; } 796 797 /// \brief If the name was qualified, retrieves the nested-name-specifier 798 /// that precedes the name. Otherwise, returns NULL. 799 NestedNameSpecifier *getQualifier() const { 800 if (!hasQualifier()) 801 return 0; 802 803 return getInternalQualifierLoc().getNestedNameSpecifier(); 804 } 805 806 /// \brief If the name was qualified, retrieves the nested-name-specifier 807 /// that precedes the name, with source-location information. 808 NestedNameSpecifierLoc getQualifierLoc() const { 809 if (!hasQualifier()) 810 return NestedNameSpecifierLoc(); 811 812 return getInternalQualifierLoc(); 813 } 814 815 /// \brief Get the NamedDecl through which this reference occured. 816 /// 817 /// This Decl may be different from the ValueDecl actually referred to in the 818 /// presence of using declarations, etc. It always returns non-NULL, and may 819 /// simple return the ValueDecl when appropriate. 820 NamedDecl *getFoundDecl() { 821 return hasFoundDecl() ? getInternalFoundDecl() : D; 822 } 823 824 /// \brief Get the NamedDecl through which this reference occurred. 825 /// See non-const variant. 826 const NamedDecl *getFoundDecl() const { 827 return hasFoundDecl() ? getInternalFoundDecl() : D; 828 } 829 830 /// \brief Determines whether this declaration reference was followed by an 831 /// explict template argument list. 832 bool hasExplicitTemplateArgs() const { 833 return DeclRefExprBits.HasExplicitTemplateArgs; 834 } 835 836 /// \brief Retrieve the explicit template argument list that followed the 837 /// member template name. 838 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 839 assert(hasExplicitTemplateArgs()); 840 if (hasFoundDecl()) 841 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 842 &getInternalFoundDecl() + 1); 843 844 if (hasQualifier()) 845 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 846 &getInternalQualifierLoc() + 1); 847 848 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 849 } 850 851 /// \brief Retrieve the explicit template argument list that followed the 852 /// member template name. 853 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 854 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 855 } 856 857 /// \brief Retrieves the optional explicit template arguments. 858 /// This points to the same data as getExplicitTemplateArgs(), but 859 /// returns null if there are no explicit template arguments. 860 const ExplicitTemplateArgumentList *getExplicitTemplateArgsOpt() const { 861 if (!hasExplicitTemplateArgs()) return 0; 862 return &getExplicitTemplateArgs(); 863 } 864 865 /// \brief Copies the template arguments (if present) into the given 866 /// structure. 867 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 868 if (hasExplicitTemplateArgs()) 869 getExplicitTemplateArgs().copyInto(List); 870 } 871 872 /// \brief Retrieve the location of the left angle bracket following the 873 /// member name ('<'), if any. 874 SourceLocation getLAngleLoc() const { 875 if (!hasExplicitTemplateArgs()) 876 return SourceLocation(); 877 878 return getExplicitTemplateArgs().LAngleLoc; 879 } 880 881 /// \brief Retrieve the template arguments provided as part of this 882 /// template-id. 883 const TemplateArgumentLoc *getTemplateArgs() const { 884 if (!hasExplicitTemplateArgs()) 885 return 0; 886 887 return getExplicitTemplateArgs().getTemplateArgs(); 888 } 889 890 /// \brief Retrieve the number of template arguments provided as part of this 891 /// template-id. 892 unsigned getNumTemplateArgs() const { 893 if (!hasExplicitTemplateArgs()) 894 return 0; 895 896 return getExplicitTemplateArgs().NumTemplateArgs; 897 } 898 899 /// \brief Retrieve the location of the right angle bracket following the 900 /// template arguments ('>'). 901 SourceLocation getRAngleLoc() const { 902 if (!hasExplicitTemplateArgs()) 903 return SourceLocation(); 904 905 return getExplicitTemplateArgs().RAngleLoc; 906 } 907 908 static bool classof(const Stmt *T) { 909 return T->getStmtClass() == DeclRefExprClass; 910 } 911 static bool classof(const DeclRefExpr *) { return true; } 912 913 // Iterators 914 child_range children() { return child_range(); } 915 916 friend class ASTStmtReader; 917 friend class ASTStmtWriter; 918}; 919 920/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 921class PredefinedExpr : public Expr { 922public: 923 enum IdentType { 924 Func, 925 Function, 926 PrettyFunction, 927 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 928 /// 'virtual' keyword is omitted for virtual member functions. 929 PrettyFunctionNoVirtual 930 }; 931 932private: 933 SourceLocation Loc; 934 IdentType Type; 935public: 936 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 937 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 938 type->isDependentType(), type->isDependentType(), 939 /*ContainsUnexpandedParameterPack=*/false), 940 Loc(l), Type(IT) {} 941 942 /// \brief Construct an empty predefined expression. 943 explicit PredefinedExpr(EmptyShell Empty) 944 : Expr(PredefinedExprClass, Empty) { } 945 946 IdentType getIdentType() const { return Type; } 947 void setIdentType(IdentType IT) { Type = IT; } 948 949 SourceLocation getLocation() const { return Loc; } 950 void setLocation(SourceLocation L) { Loc = L; } 951 952 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 953 954 SourceRange getSourceRange() const { return SourceRange(Loc); } 955 956 static bool classof(const Stmt *T) { 957 return T->getStmtClass() == PredefinedExprClass; 958 } 959 static bool classof(const PredefinedExpr *) { return true; } 960 961 // Iterators 962 child_range children() { return child_range(); } 963}; 964 965/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 966/// leaking memory. 967/// 968/// For large floats/integers, APFloat/APInt will allocate memory from the heap 969/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 970/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 971/// the APFloat/APInt values will never get freed. APNumericStorage uses 972/// ASTContext's allocator for memory allocation. 973class APNumericStorage { 974 unsigned BitWidth; 975 union { 976 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 977 uint64_t *pVal; ///< Used to store the >64 bits integer value. 978 }; 979 980 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 981 982 APNumericStorage(const APNumericStorage&); // do not implement 983 APNumericStorage& operator=(const APNumericStorage&); // do not implement 984 985protected: 986 APNumericStorage() : BitWidth(0), VAL(0) { } 987 988 llvm::APInt getIntValue() const { 989 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 990 if (NumWords > 1) 991 return llvm::APInt(BitWidth, NumWords, pVal); 992 else 993 return llvm::APInt(BitWidth, VAL); 994 } 995 void setIntValue(ASTContext &C, const llvm::APInt &Val); 996}; 997 998class APIntStorage : public APNumericStorage { 999public: 1000 llvm::APInt getValue() const { return getIntValue(); } 1001 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 1002}; 1003 1004class APFloatStorage : public APNumericStorage { 1005public: 1006 llvm::APFloat getValue() const { return llvm::APFloat(getIntValue()); } 1007 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1008 setIntValue(C, Val.bitcastToAPInt()); 1009 } 1010}; 1011 1012class IntegerLiteral : public Expr { 1013 APIntStorage Num; 1014 SourceLocation Loc; 1015 1016 /// \brief Construct an empty integer literal. 1017 explicit IntegerLiteral(EmptyShell Empty) 1018 : Expr(IntegerLiteralClass, Empty) { } 1019 1020public: 1021 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 1022 // or UnsignedLongLongTy 1023 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 1024 QualType type, SourceLocation l) 1025 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1026 false), 1027 Loc(l) { 1028 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 1029 assert(V.getBitWidth() == C.getIntWidth(type) && 1030 "Integer type is not the correct size for constant."); 1031 setValue(C, V); 1032 } 1033 1034 /// \brief Returns a new integer literal with value 'V' and type 'type'. 1035 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy, 1036 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V 1037 /// \param V - the value that the returned integer literal contains. 1038 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 1039 QualType type, SourceLocation l); 1040 /// \brief Returns a new empty integer literal. 1041 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 1042 1043 llvm::APInt getValue() const { return Num.getValue(); } 1044 SourceRange getSourceRange() const { return SourceRange(Loc); } 1045 1046 /// \brief Retrieve the location of the literal. 1047 SourceLocation getLocation() const { return Loc; } 1048 1049 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 1050 void setLocation(SourceLocation Location) { Loc = Location; } 1051 1052 static bool classof(const Stmt *T) { 1053 return T->getStmtClass() == IntegerLiteralClass; 1054 } 1055 static bool classof(const IntegerLiteral *) { return true; } 1056 1057 // Iterators 1058 child_range children() { return child_range(); } 1059}; 1060 1061class CharacterLiteral : public Expr { 1062 unsigned Value; 1063 SourceLocation Loc; 1064 bool IsWide; 1065public: 1066 // type should be IntTy 1067 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 1068 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1069 false), 1070 Value(value), Loc(l), IsWide(iswide) { 1071 } 1072 1073 /// \brief Construct an empty character literal. 1074 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1075 1076 SourceLocation getLocation() const { return Loc; } 1077 bool isWide() const { return IsWide; } 1078 1079 SourceRange getSourceRange() const { return SourceRange(Loc); } 1080 1081 unsigned getValue() const { return Value; } 1082 1083 void setLocation(SourceLocation Location) { Loc = Location; } 1084 void setWide(bool W) { IsWide = W; } 1085 void setValue(unsigned Val) { Value = Val; } 1086 1087 static bool classof(const Stmt *T) { 1088 return T->getStmtClass() == CharacterLiteralClass; 1089 } 1090 static bool classof(const CharacterLiteral *) { return true; } 1091 1092 // Iterators 1093 child_range children() { return child_range(); } 1094}; 1095 1096class FloatingLiteral : public Expr { 1097 APFloatStorage Num; 1098 bool IsExact : 1; 1099 SourceLocation Loc; 1100 1101 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1102 QualType Type, SourceLocation L) 1103 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1104 false), 1105 IsExact(isexact), Loc(L) { 1106 setValue(C, V); 1107 } 1108 1109 /// \brief Construct an empty floating-point literal. 1110 explicit FloatingLiteral(EmptyShell Empty) 1111 : Expr(FloatingLiteralClass, Empty), IsExact(false) { } 1112 1113public: 1114 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1115 bool isexact, QualType Type, SourceLocation L); 1116 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1117 1118 llvm::APFloat getValue() const { return Num.getValue(); } 1119 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1120 Num.setValue(C, Val); 1121 } 1122 1123 bool isExact() const { return IsExact; } 1124 void setExact(bool E) { IsExact = E; } 1125 1126 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1127 /// double. Note that this may cause loss of precision, but is useful for 1128 /// debugging dumps, etc. 1129 double getValueAsApproximateDouble() const; 1130 1131 SourceLocation getLocation() const { return Loc; } 1132 void setLocation(SourceLocation L) { Loc = L; } 1133 1134 SourceRange getSourceRange() const { return SourceRange(Loc); } 1135 1136 static bool classof(const Stmt *T) { 1137 return T->getStmtClass() == FloatingLiteralClass; 1138 } 1139 static bool classof(const FloatingLiteral *) { return true; } 1140 1141 // Iterators 1142 child_range children() { return child_range(); } 1143}; 1144 1145/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1146/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1147/// IntegerLiteral classes. Instances of this class always have a Complex type 1148/// whose element type matches the subexpression. 1149/// 1150class ImaginaryLiteral : public Expr { 1151 Stmt *Val; 1152public: 1153 ImaginaryLiteral(Expr *val, QualType Ty) 1154 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1155 false), 1156 Val(val) {} 1157 1158 /// \brief Build an empty imaginary literal. 1159 explicit ImaginaryLiteral(EmptyShell Empty) 1160 : Expr(ImaginaryLiteralClass, Empty) { } 1161 1162 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1163 Expr *getSubExpr() { return cast<Expr>(Val); } 1164 void setSubExpr(Expr *E) { Val = E; } 1165 1166 SourceRange getSourceRange() const { return Val->getSourceRange(); } 1167 static bool classof(const Stmt *T) { 1168 return T->getStmtClass() == ImaginaryLiteralClass; 1169 } 1170 static bool classof(const ImaginaryLiteral *) { return true; } 1171 1172 // Iterators 1173 child_range children() { return child_range(&Val, &Val+1); } 1174}; 1175 1176/// StringLiteral - This represents a string literal expression, e.g. "foo" 1177/// or L"bar" (wide strings). The actual string is returned by getStrData() 1178/// is NOT null-terminated, and the length of the string is determined by 1179/// calling getByteLength(). The C type for a string is always a 1180/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1181/// not. 1182/// 1183/// Note that strings in C can be formed by concatenation of multiple string 1184/// literal pptokens in translation phase #6. This keeps track of the locations 1185/// of each of these pieces. 1186/// 1187/// Strings in C can also be truncated and extended by assigning into arrays, 1188/// e.g. with constructs like: 1189/// char X[2] = "foobar"; 1190/// In this case, getByteLength() will return 6, but the string literal will 1191/// have type "char[2]". 1192class StringLiteral : public Expr { 1193 friend class ASTStmtReader; 1194 1195 const char *StrData; 1196 unsigned ByteLength; 1197 bool IsWide; 1198 bool IsPascal; 1199 unsigned NumConcatenated; 1200 SourceLocation TokLocs[1]; 1201 1202 StringLiteral(QualType Ty) : 1203 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false) {} 1204 1205public: 1206 /// This is the "fully general" constructor that allows representation of 1207 /// strings formed from multiple concatenated tokens. 1208 static StringLiteral *Create(ASTContext &C, const char *StrData, 1209 unsigned ByteLength, bool Wide, bool Pascal, 1210 QualType Ty, 1211 const SourceLocation *Loc, unsigned NumStrs); 1212 1213 /// Simple constructor for string literals made from one token. 1214 static StringLiteral *Create(ASTContext &C, const char *StrData, 1215 unsigned ByteLength, bool Wide, 1216 bool Pascal, QualType Ty, SourceLocation Loc) { 1217 return Create(C, StrData, ByteLength, Wide, Pascal, Ty, &Loc, 1); 1218 } 1219 1220 /// \brief Construct an empty string literal. 1221 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1222 1223 llvm::StringRef getString() const { 1224 return llvm::StringRef(StrData, ByteLength); 1225 } 1226 1227 unsigned getByteLength() const { return ByteLength; } 1228 1229 /// \brief Sets the string data to the given string data. 1230 void setString(ASTContext &C, llvm::StringRef Str); 1231 1232 bool isWide() const { return IsWide; } 1233 bool isPascal() const { return IsPascal; } 1234 1235 bool containsNonAsciiOrNull() const { 1236 llvm::StringRef Str = getString(); 1237 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1238 if (!isascii(Str[i]) || !Str[i]) 1239 return true; 1240 return false; 1241 } 1242 /// getNumConcatenated - Get the number of string literal tokens that were 1243 /// concatenated in translation phase #6 to form this string literal. 1244 unsigned getNumConcatenated() const { return NumConcatenated; } 1245 1246 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1247 assert(TokNum < NumConcatenated && "Invalid tok number"); 1248 return TokLocs[TokNum]; 1249 } 1250 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1251 assert(TokNum < NumConcatenated && "Invalid tok number"); 1252 TokLocs[TokNum] = L; 1253 } 1254 1255 /// getLocationOfByte - Return a source location that points to the specified 1256 /// byte of this string literal. 1257 /// 1258 /// Strings are amazingly complex. They can be formed from multiple tokens 1259 /// and can have escape sequences in them in addition to the usual trigraph 1260 /// and escaped newline business. This routine handles this complexity. 1261 /// 1262 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1263 const LangOptions &Features, 1264 const TargetInfo &Target) const; 1265 1266 typedef const SourceLocation *tokloc_iterator; 1267 tokloc_iterator tokloc_begin() const { return TokLocs; } 1268 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1269 1270 SourceRange getSourceRange() const { 1271 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1272 } 1273 static bool classof(const Stmt *T) { 1274 return T->getStmtClass() == StringLiteralClass; 1275 } 1276 static bool classof(const StringLiteral *) { return true; } 1277 1278 // Iterators 1279 child_range children() { return child_range(); } 1280}; 1281 1282/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1283/// AST node is only formed if full location information is requested. 1284class ParenExpr : public Expr { 1285 SourceLocation L, R; 1286 Stmt *Val; 1287public: 1288 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1289 : Expr(ParenExprClass, val->getType(), 1290 val->getValueKind(), val->getObjectKind(), 1291 val->isTypeDependent(), val->isValueDependent(), 1292 val->containsUnexpandedParameterPack()), 1293 L(l), R(r), Val(val) {} 1294 1295 /// \brief Construct an empty parenthesized expression. 1296 explicit ParenExpr(EmptyShell Empty) 1297 : Expr(ParenExprClass, Empty) { } 1298 1299 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1300 Expr *getSubExpr() { return cast<Expr>(Val); } 1301 void setSubExpr(Expr *E) { Val = E; } 1302 1303 SourceRange getSourceRange() const { return SourceRange(L, R); } 1304 1305 /// \brief Get the location of the left parentheses '('. 1306 SourceLocation getLParen() const { return L; } 1307 void setLParen(SourceLocation Loc) { L = Loc; } 1308 1309 /// \brief Get the location of the right parentheses ')'. 1310 SourceLocation getRParen() const { return R; } 1311 void setRParen(SourceLocation Loc) { R = Loc; } 1312 1313 static bool classof(const Stmt *T) { 1314 return T->getStmtClass() == ParenExprClass; 1315 } 1316 static bool classof(const ParenExpr *) { return true; } 1317 1318 // Iterators 1319 child_range children() { return child_range(&Val, &Val+1); } 1320}; 1321 1322 1323/// UnaryOperator - This represents the unary-expression's (except sizeof and 1324/// alignof), the postinc/postdec operators from postfix-expression, and various 1325/// extensions. 1326/// 1327/// Notes on various nodes: 1328/// 1329/// Real/Imag - These return the real/imag part of a complex operand. If 1330/// applied to a non-complex value, the former returns its operand and the 1331/// later returns zero in the type of the operand. 1332/// 1333class UnaryOperator : public Expr { 1334public: 1335 typedef UnaryOperatorKind Opcode; 1336 1337private: 1338 unsigned Opc : 5; 1339 SourceLocation Loc; 1340 Stmt *Val; 1341public: 1342 1343 UnaryOperator(Expr *input, Opcode opc, QualType type, 1344 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1345 : Expr(UnaryOperatorClass, type, VK, OK, 1346 input->isTypeDependent() || type->isDependentType(), 1347 input->isValueDependent(), 1348 input->containsUnexpandedParameterPack()), 1349 Opc(opc), Loc(l), Val(input) {} 1350 1351 /// \brief Build an empty unary operator. 1352 explicit UnaryOperator(EmptyShell Empty) 1353 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1354 1355 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1356 void setOpcode(Opcode O) { Opc = O; } 1357 1358 Expr *getSubExpr() const { return cast<Expr>(Val); } 1359 void setSubExpr(Expr *E) { Val = E; } 1360 1361 /// getOperatorLoc - Return the location of the operator. 1362 SourceLocation getOperatorLoc() const { return Loc; } 1363 void setOperatorLoc(SourceLocation L) { Loc = L; } 1364 1365 /// isPostfix - Return true if this is a postfix operation, like x++. 1366 static bool isPostfix(Opcode Op) { 1367 return Op == UO_PostInc || Op == UO_PostDec; 1368 } 1369 1370 /// isPrefix - Return true if this is a prefix operation, like --x. 1371 static bool isPrefix(Opcode Op) { 1372 return Op == UO_PreInc || Op == UO_PreDec; 1373 } 1374 1375 bool isPrefix() const { return isPrefix(getOpcode()); } 1376 bool isPostfix() const { return isPostfix(getOpcode()); } 1377 bool isIncrementOp() const { 1378 return Opc == UO_PreInc || Opc == UO_PostInc; 1379 } 1380 bool isIncrementDecrementOp() const { 1381 return Opc <= UO_PreDec; 1382 } 1383 static bool isArithmeticOp(Opcode Op) { 1384 return Op >= UO_Plus && Op <= UO_LNot; 1385 } 1386 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1387 1388 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1389 /// corresponds to, e.g. "sizeof" or "[pre]++" 1390 static const char *getOpcodeStr(Opcode Op); 1391 1392 /// \brief Retrieve the unary opcode that corresponds to the given 1393 /// overloaded operator. 1394 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1395 1396 /// \brief Retrieve the overloaded operator kind that corresponds to 1397 /// the given unary opcode. 1398 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1399 1400 SourceRange getSourceRange() const { 1401 if (isPostfix()) 1402 return SourceRange(Val->getLocStart(), Loc); 1403 else 1404 return SourceRange(Loc, Val->getLocEnd()); 1405 } 1406 SourceLocation getExprLoc() const { return Loc; } 1407 1408 static bool classof(const Stmt *T) { 1409 return T->getStmtClass() == UnaryOperatorClass; 1410 } 1411 static bool classof(const UnaryOperator *) { return true; } 1412 1413 // Iterators 1414 child_range children() { return child_range(&Val, &Val+1); } 1415}; 1416 1417/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1418/// offsetof(record-type, member-designator). For example, given: 1419/// @code 1420/// struct S { 1421/// float f; 1422/// double d; 1423/// }; 1424/// struct T { 1425/// int i; 1426/// struct S s[10]; 1427/// }; 1428/// @endcode 1429/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1430 1431class OffsetOfExpr : public Expr { 1432public: 1433 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1434 class OffsetOfNode { 1435 public: 1436 /// \brief The kind of offsetof node we have. 1437 enum Kind { 1438 /// \brief An index into an array. 1439 Array = 0x00, 1440 /// \brief A field. 1441 Field = 0x01, 1442 /// \brief A field in a dependent type, known only by its name. 1443 Identifier = 0x02, 1444 /// \brief An implicit indirection through a C++ base class, when the 1445 /// field found is in a base class. 1446 Base = 0x03 1447 }; 1448 1449 private: 1450 enum { MaskBits = 2, Mask = 0x03 }; 1451 1452 /// \brief The source range that covers this part of the designator. 1453 SourceRange Range; 1454 1455 /// \brief The data describing the designator, which comes in three 1456 /// different forms, depending on the lower two bits. 1457 /// - An unsigned index into the array of Expr*'s stored after this node 1458 /// in memory, for [constant-expression] designators. 1459 /// - A FieldDecl*, for references to a known field. 1460 /// - An IdentifierInfo*, for references to a field with a given name 1461 /// when the class type is dependent. 1462 /// - A CXXBaseSpecifier*, for references that look at a field in a 1463 /// base class. 1464 uintptr_t Data; 1465 1466 public: 1467 /// \brief Create an offsetof node that refers to an array element. 1468 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1469 SourceLocation RBracketLoc) 1470 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1471 1472 /// \brief Create an offsetof node that refers to a field. 1473 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1474 SourceLocation NameLoc) 1475 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1476 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1477 1478 /// \brief Create an offsetof node that refers to an identifier. 1479 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1480 SourceLocation NameLoc) 1481 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1482 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1483 1484 /// \brief Create an offsetof node that refers into a C++ base class. 1485 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1486 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1487 1488 /// \brief Determine what kind of offsetof node this is. 1489 Kind getKind() const { 1490 return static_cast<Kind>(Data & Mask); 1491 } 1492 1493 /// \brief For an array element node, returns the index into the array 1494 /// of expressions. 1495 unsigned getArrayExprIndex() const { 1496 assert(getKind() == Array); 1497 return Data >> 2; 1498 } 1499 1500 /// \brief For a field offsetof node, returns the field. 1501 FieldDecl *getField() const { 1502 assert(getKind() == Field); 1503 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1504 } 1505 1506 /// \brief For a field or identifier offsetof node, returns the name of 1507 /// the field. 1508 IdentifierInfo *getFieldName() const; 1509 1510 /// \brief For a base class node, returns the base specifier. 1511 CXXBaseSpecifier *getBase() const { 1512 assert(getKind() == Base); 1513 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1514 } 1515 1516 /// \brief Retrieve the source range that covers this offsetof node. 1517 /// 1518 /// For an array element node, the source range contains the locations of 1519 /// the square brackets. For a field or identifier node, the source range 1520 /// contains the location of the period (if there is one) and the 1521 /// identifier. 1522 SourceRange getSourceRange() const { return Range; } 1523 }; 1524 1525private: 1526 1527 SourceLocation OperatorLoc, RParenLoc; 1528 // Base type; 1529 TypeSourceInfo *TSInfo; 1530 // Number of sub-components (i.e. instances of OffsetOfNode). 1531 unsigned NumComps; 1532 // Number of sub-expressions (i.e. array subscript expressions). 1533 unsigned NumExprs; 1534 1535 OffsetOfExpr(ASTContext &C, QualType type, 1536 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1537 OffsetOfNode* compsPtr, unsigned numComps, 1538 Expr** exprsPtr, unsigned numExprs, 1539 SourceLocation RParenLoc); 1540 1541 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1542 : Expr(OffsetOfExprClass, EmptyShell()), 1543 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1544 1545public: 1546 1547 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1548 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1549 OffsetOfNode* compsPtr, unsigned numComps, 1550 Expr** exprsPtr, unsigned numExprs, 1551 SourceLocation RParenLoc); 1552 1553 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1554 unsigned NumComps, unsigned NumExprs); 1555 1556 /// getOperatorLoc - Return the location of the operator. 1557 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1558 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1559 1560 /// \brief Return the location of the right parentheses. 1561 SourceLocation getRParenLoc() const { return RParenLoc; } 1562 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1563 1564 TypeSourceInfo *getTypeSourceInfo() const { 1565 return TSInfo; 1566 } 1567 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1568 TSInfo = tsi; 1569 } 1570 1571 const OffsetOfNode &getComponent(unsigned Idx) const { 1572 assert(Idx < NumComps && "Subscript out of range"); 1573 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1574 } 1575 1576 void setComponent(unsigned Idx, OffsetOfNode ON) { 1577 assert(Idx < NumComps && "Subscript out of range"); 1578 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1579 } 1580 1581 unsigned getNumComponents() const { 1582 return NumComps; 1583 } 1584 1585 Expr* getIndexExpr(unsigned Idx) { 1586 assert(Idx < NumExprs && "Subscript out of range"); 1587 return reinterpret_cast<Expr **>( 1588 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1589 } 1590 const Expr *getIndexExpr(unsigned Idx) const { 1591 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1592 } 1593 1594 void setIndexExpr(unsigned Idx, Expr* E) { 1595 assert(Idx < NumComps && "Subscript out of range"); 1596 reinterpret_cast<Expr **>( 1597 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1598 } 1599 1600 unsigned getNumExpressions() const { 1601 return NumExprs; 1602 } 1603 1604 SourceRange getSourceRange() const { 1605 return SourceRange(OperatorLoc, RParenLoc); 1606 } 1607 1608 static bool classof(const Stmt *T) { 1609 return T->getStmtClass() == OffsetOfExprClass; 1610 } 1611 1612 static bool classof(const OffsetOfExpr *) { return true; } 1613 1614 // Iterators 1615 child_range children() { 1616 Stmt **begin = 1617 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1618 + NumComps); 1619 return child_range(begin, begin + NumExprs); 1620 } 1621}; 1622 1623/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1624/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1625/// vec_step (OpenCL 1.1 6.11.12). 1626class UnaryExprOrTypeTraitExpr : public Expr { 1627 unsigned Kind : 2; 1628 bool isType : 1; // true if operand is a type, false if an expression 1629 union { 1630 TypeSourceInfo *Ty; 1631 Stmt *Ex; 1632 } Argument; 1633 SourceLocation OpLoc, RParenLoc; 1634 1635public: 1636 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1637 QualType resultType, SourceLocation op, 1638 SourceLocation rp) : 1639 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1640 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1641 // Value-dependent if the argument is type-dependent. 1642 TInfo->getType()->isDependentType(), 1643 TInfo->getType()->containsUnexpandedParameterPack()), 1644 Kind(ExprKind), isType(true), OpLoc(op), RParenLoc(rp) { 1645 Argument.Ty = TInfo; 1646 } 1647 1648 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1649 QualType resultType, SourceLocation op, 1650 SourceLocation rp) : 1651 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1652 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1653 // Value-dependent if the argument is type-dependent. 1654 E->isTypeDependent(), 1655 E->containsUnexpandedParameterPack()), 1656 Kind(ExprKind), isType(false), OpLoc(op), RParenLoc(rp) { 1657 Argument.Ex = E; 1658 } 1659 1660 /// \brief Construct an empty sizeof/alignof expression. 1661 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1662 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1663 1664 UnaryExprOrTypeTrait getKind() const { 1665 return static_cast<UnaryExprOrTypeTrait>(Kind); 1666 } 1667 void setKind(UnaryExprOrTypeTrait K) { Kind = K; } 1668 1669 bool isArgumentType() const { return isType; } 1670 QualType getArgumentType() const { 1671 return getArgumentTypeInfo()->getType(); 1672 } 1673 TypeSourceInfo *getArgumentTypeInfo() const { 1674 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1675 return Argument.Ty; 1676 } 1677 Expr *getArgumentExpr() { 1678 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1679 return static_cast<Expr*>(Argument.Ex); 1680 } 1681 const Expr *getArgumentExpr() const { 1682 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1683 } 1684 1685 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1686 void setArgument(TypeSourceInfo *TInfo) { 1687 Argument.Ty = TInfo; 1688 isType = true; 1689 } 1690 1691 /// Gets the argument type, or the type of the argument expression, whichever 1692 /// is appropriate. 1693 QualType getTypeOfArgument() const { 1694 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1695 } 1696 1697 SourceLocation getOperatorLoc() const { return OpLoc; } 1698 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1699 1700 SourceLocation getRParenLoc() const { return RParenLoc; } 1701 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1702 1703 SourceRange getSourceRange() const { 1704 return SourceRange(OpLoc, RParenLoc); 1705 } 1706 1707 static bool classof(const Stmt *T) { 1708 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1709 } 1710 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1711 1712 // Iterators 1713 child_range children(); 1714}; 1715 1716//===----------------------------------------------------------------------===// 1717// Postfix Operators. 1718//===----------------------------------------------------------------------===// 1719 1720/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1721class ArraySubscriptExpr : public Expr { 1722 enum { LHS, RHS, END_EXPR=2 }; 1723 Stmt* SubExprs[END_EXPR]; 1724 SourceLocation RBracketLoc; 1725public: 1726 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1727 ExprValueKind VK, ExprObjectKind OK, 1728 SourceLocation rbracketloc) 1729 : Expr(ArraySubscriptExprClass, t, VK, OK, 1730 lhs->isTypeDependent() || rhs->isTypeDependent(), 1731 lhs->isValueDependent() || rhs->isValueDependent(), 1732 (lhs->containsUnexpandedParameterPack() || 1733 rhs->containsUnexpandedParameterPack())), 1734 RBracketLoc(rbracketloc) { 1735 SubExprs[LHS] = lhs; 1736 SubExprs[RHS] = rhs; 1737 } 1738 1739 /// \brief Create an empty array subscript expression. 1740 explicit ArraySubscriptExpr(EmptyShell Shell) 1741 : Expr(ArraySubscriptExprClass, Shell) { } 1742 1743 /// An array access can be written A[4] or 4[A] (both are equivalent). 1744 /// - getBase() and getIdx() always present the normalized view: A[4]. 1745 /// In this case getBase() returns "A" and getIdx() returns "4". 1746 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1747 /// 4[A] getLHS() returns "4". 1748 /// Note: Because vector element access is also written A[4] we must 1749 /// predicate the format conversion in getBase and getIdx only on the 1750 /// the type of the RHS, as it is possible for the LHS to be a vector of 1751 /// integer type 1752 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1753 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1754 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1755 1756 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1757 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1758 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1759 1760 Expr *getBase() { 1761 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1762 } 1763 1764 const Expr *getBase() const { 1765 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1766 } 1767 1768 Expr *getIdx() { 1769 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1770 } 1771 1772 const Expr *getIdx() const { 1773 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1774 } 1775 1776 SourceRange getSourceRange() const { 1777 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1778 } 1779 1780 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1781 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1782 1783 SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1784 1785 static bool classof(const Stmt *T) { 1786 return T->getStmtClass() == ArraySubscriptExprClass; 1787 } 1788 static bool classof(const ArraySubscriptExpr *) { return true; } 1789 1790 // Iterators 1791 child_range children() { 1792 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 1793 } 1794}; 1795 1796 1797/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1798/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1799/// while its subclasses may represent alternative syntax that (semantically) 1800/// results in a function call. For example, CXXOperatorCallExpr is 1801/// a subclass for overloaded operator calls that use operator syntax, e.g., 1802/// "str1 + str2" to resolve to a function call. 1803class CallExpr : public Expr { 1804 enum { FN=0, PREARGS_START=1 }; 1805 Stmt **SubExprs; 1806 unsigned NumArgs; 1807 SourceLocation RParenLoc; 1808 1809protected: 1810 // These versions of the constructor are for derived classes. 1811 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 1812 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 1813 SourceLocation rparenloc); 1814 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 1815 1816 Stmt *getPreArg(unsigned i) { 1817 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1818 return SubExprs[PREARGS_START+i]; 1819 } 1820 const Stmt *getPreArg(unsigned i) const { 1821 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1822 return SubExprs[PREARGS_START+i]; 1823 } 1824 void setPreArg(unsigned i, Stmt *PreArg) { 1825 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1826 SubExprs[PREARGS_START+i] = PreArg; 1827 } 1828 1829 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 1830 1831public: 1832 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1833 ExprValueKind VK, SourceLocation rparenloc); 1834 1835 /// \brief Build an empty call expression. 1836 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1837 1838 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1839 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1840 void setCallee(Expr *F) { SubExprs[FN] = F; } 1841 1842 Decl *getCalleeDecl(); 1843 const Decl *getCalleeDecl() const { 1844 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1845 } 1846 1847 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1848 FunctionDecl *getDirectCallee(); 1849 const FunctionDecl *getDirectCallee() const { 1850 return const_cast<CallExpr*>(this)->getDirectCallee(); 1851 } 1852 1853 /// getNumArgs - Return the number of actual arguments to this call. 1854 /// 1855 unsigned getNumArgs() const { return NumArgs; } 1856 1857 /// \brief Retrieve the call arguments. 1858 Expr **getArgs() { 1859 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 1860 } 1861 1862 /// getArg - Return the specified argument. 1863 Expr *getArg(unsigned Arg) { 1864 assert(Arg < NumArgs && "Arg access out of range!"); 1865 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1866 } 1867 const Expr *getArg(unsigned Arg) const { 1868 assert(Arg < NumArgs && "Arg access out of range!"); 1869 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1870 } 1871 1872 /// setArg - Set the specified argument. 1873 void setArg(unsigned Arg, Expr *ArgExpr) { 1874 assert(Arg < NumArgs && "Arg access out of range!"); 1875 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 1876 } 1877 1878 /// setNumArgs - This changes the number of arguments present in this call. 1879 /// Any orphaned expressions are deleted by this, and any new operands are set 1880 /// to null. 1881 void setNumArgs(ASTContext& C, unsigned NumArgs); 1882 1883 typedef ExprIterator arg_iterator; 1884 typedef ConstExprIterator const_arg_iterator; 1885 1886 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 1887 arg_iterator arg_end() { 1888 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1889 } 1890 const_arg_iterator arg_begin() const { 1891 return SubExprs+PREARGS_START+getNumPreArgs(); 1892 } 1893 const_arg_iterator arg_end() const { 1894 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1895 } 1896 1897 /// getNumCommas - Return the number of commas that must have been present in 1898 /// this function call. 1899 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1900 1901 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1902 /// not, return 0. 1903 unsigned isBuiltinCall(const ASTContext &Context) const; 1904 1905 /// getCallReturnType - Get the return type of the call expr. This is not 1906 /// always the type of the expr itself, if the return type is a reference 1907 /// type. 1908 QualType getCallReturnType() const; 1909 1910 SourceLocation getRParenLoc() const { return RParenLoc; } 1911 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1912 1913 SourceRange getSourceRange() const; 1914 1915 static bool classof(const Stmt *T) { 1916 return T->getStmtClass() >= firstCallExprConstant && 1917 T->getStmtClass() <= lastCallExprConstant; 1918 } 1919 static bool classof(const CallExpr *) { return true; } 1920 1921 // Iterators 1922 child_range children() { 1923 return child_range(&SubExprs[0], 1924 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 1925 } 1926}; 1927 1928/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1929/// 1930class MemberExpr : public Expr { 1931 /// Extra data stored in some member expressions. 1932 struct MemberNameQualifier { 1933 /// \brief The nested-name-specifier that qualifies the name, including 1934 /// source-location information. 1935 NestedNameSpecifierLoc QualifierLoc; 1936 1937 /// \brief The DeclAccessPair through which the MemberDecl was found due to 1938 /// name qualifiers. 1939 DeclAccessPair FoundDecl; 1940 }; 1941 1942 /// Base - the expression for the base pointer or structure references. In 1943 /// X.F, this is "X". 1944 Stmt *Base; 1945 1946 /// MemberDecl - This is the decl being referenced by the field/member name. 1947 /// In X.F, this is the decl referenced by F. 1948 ValueDecl *MemberDecl; 1949 1950 /// MemberLoc - This is the location of the member name. 1951 SourceLocation MemberLoc; 1952 1953 /// MemberDNLoc - Provides source/type location info for the 1954 /// declaration name embedded in MemberDecl. 1955 DeclarationNameLoc MemberDNLoc; 1956 1957 /// IsArrow - True if this is "X->F", false if this is "X.F". 1958 bool IsArrow : 1; 1959 1960 /// \brief True if this member expression used a nested-name-specifier to 1961 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1962 /// declaration. When true, a MemberNameQualifier 1963 /// structure is allocated immediately after the MemberExpr. 1964 bool HasQualifierOrFoundDecl : 1; 1965 1966 /// \brief True if this member expression specified a template argument list 1967 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1968 /// structure (and its TemplateArguments) are allocated immediately after 1969 /// the MemberExpr or, if the member expression also has a qualifier, after 1970 /// the MemberNameQualifier structure. 1971 bool HasExplicitTemplateArgumentList : 1; 1972 1973 /// \brief Retrieve the qualifier that preceded the member name, if any. 1974 MemberNameQualifier *getMemberQualifier() { 1975 assert(HasQualifierOrFoundDecl); 1976 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1977 } 1978 1979 /// \brief Retrieve the qualifier that preceded the member name, if any. 1980 const MemberNameQualifier *getMemberQualifier() const { 1981 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1982 } 1983 1984public: 1985 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1986 const DeclarationNameInfo &NameInfo, QualType ty, 1987 ExprValueKind VK, ExprObjectKind OK) 1988 : Expr(MemberExprClass, ty, VK, OK, 1989 base->isTypeDependent(), base->isValueDependent(), 1990 base->containsUnexpandedParameterPack()), 1991 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 1992 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 1993 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) { 1994 assert(memberdecl->getDeclName() == NameInfo.getName()); 1995 } 1996 1997 // NOTE: this constructor should be used only when it is known that 1998 // the member name can not provide additional syntactic info 1999 // (i.e., source locations for C++ operator names or type source info 2000 // for constructors, destructors and conversion oeprators). 2001 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2002 SourceLocation l, QualType ty, 2003 ExprValueKind VK, ExprObjectKind OK) 2004 : Expr(MemberExprClass, ty, VK, OK, 2005 base->isTypeDependent(), base->isValueDependent(), 2006 base->containsUnexpandedParameterPack()), 2007 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 2008 IsArrow(isarrow), 2009 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 2010 2011 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2012 NestedNameSpecifierLoc QualifierLoc, 2013 ValueDecl *memberdecl, DeclAccessPair founddecl, 2014 DeclarationNameInfo MemberNameInfo, 2015 const TemplateArgumentListInfo *targs, 2016 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2017 2018 void setBase(Expr *E) { Base = E; } 2019 Expr *getBase() const { return cast<Expr>(Base); } 2020 2021 /// \brief Retrieve the member declaration to which this expression refers. 2022 /// 2023 /// The returned declaration will either be a FieldDecl or (in C++) 2024 /// a CXXMethodDecl. 2025 ValueDecl *getMemberDecl() const { return MemberDecl; } 2026 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2027 2028 /// \brief Retrieves the declaration found by lookup. 2029 DeclAccessPair getFoundDecl() const { 2030 if (!HasQualifierOrFoundDecl) 2031 return DeclAccessPair::make(getMemberDecl(), 2032 getMemberDecl()->getAccess()); 2033 return getMemberQualifier()->FoundDecl; 2034 } 2035 2036 /// \brief Determines whether this member expression actually had 2037 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2038 /// x->Base::foo. 2039 bool hasQualifier() const { return getQualifier() != 0; } 2040 2041 /// \brief If the member name was qualified, retrieves the 2042 /// nested-name-specifier that precedes the member name. Otherwise, returns 2043 /// NULL. 2044 NestedNameSpecifier *getQualifier() const { 2045 if (!HasQualifierOrFoundDecl) 2046 return 0; 2047 2048 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2049 } 2050 2051 /// \brief If the member name was qualified, retrieves the 2052 /// nested-name-specifier that precedes the member name, with source-location 2053 /// information. 2054 NestedNameSpecifierLoc getQualifierLoc() const { 2055 if (!hasQualifier()) 2056 return NestedNameSpecifierLoc(); 2057 2058 return getMemberQualifier()->QualifierLoc; 2059 } 2060 2061 /// \brief Determines whether this member expression actually had a C++ 2062 /// template argument list explicitly specified, e.g., x.f<int>. 2063 bool hasExplicitTemplateArgs() const { 2064 return HasExplicitTemplateArgumentList; 2065 } 2066 2067 /// \brief Copies the template arguments (if present) into the given 2068 /// structure. 2069 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2070 if (hasExplicitTemplateArgs()) 2071 getExplicitTemplateArgs().copyInto(List); 2072 } 2073 2074 /// \brief Retrieve the explicit template argument list that 2075 /// follow the member template name. This must only be called on an 2076 /// expression with explicit template arguments. 2077 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 2078 assert(HasExplicitTemplateArgumentList); 2079 if (!HasQualifierOrFoundDecl) 2080 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 2081 2082 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 2083 getMemberQualifier() + 1); 2084 } 2085 2086 /// \brief Retrieve the explicit template argument list that 2087 /// followed the member template name. This must only be called on 2088 /// an expression with explicit template arguments. 2089 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 2090 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2091 } 2092 2093 /// \brief Retrieves the optional explicit template arguments. 2094 /// This points to the same data as getExplicitTemplateArgs(), but 2095 /// returns null if there are no explicit template arguments. 2096 const ExplicitTemplateArgumentList *getOptionalExplicitTemplateArgs() const { 2097 if (!hasExplicitTemplateArgs()) return 0; 2098 return &getExplicitTemplateArgs(); 2099 } 2100 2101 /// \brief Retrieve the location of the left angle bracket following the 2102 /// member name ('<'), if any. 2103 SourceLocation getLAngleLoc() const { 2104 if (!HasExplicitTemplateArgumentList) 2105 return SourceLocation(); 2106 2107 return getExplicitTemplateArgs().LAngleLoc; 2108 } 2109 2110 /// \brief Retrieve the template arguments provided as part of this 2111 /// template-id. 2112 const TemplateArgumentLoc *getTemplateArgs() const { 2113 if (!HasExplicitTemplateArgumentList) 2114 return 0; 2115 2116 return getExplicitTemplateArgs().getTemplateArgs(); 2117 } 2118 2119 /// \brief Retrieve the number of template arguments provided as part of this 2120 /// template-id. 2121 unsigned getNumTemplateArgs() const { 2122 if (!HasExplicitTemplateArgumentList) 2123 return 0; 2124 2125 return getExplicitTemplateArgs().NumTemplateArgs; 2126 } 2127 2128 /// \brief Retrieve the location of the right angle bracket following the 2129 /// template arguments ('>'). 2130 SourceLocation getRAngleLoc() const { 2131 if (!HasExplicitTemplateArgumentList) 2132 return SourceLocation(); 2133 2134 return getExplicitTemplateArgs().RAngleLoc; 2135 } 2136 2137 /// \brief Retrieve the member declaration name info. 2138 DeclarationNameInfo getMemberNameInfo() const { 2139 return DeclarationNameInfo(MemberDecl->getDeclName(), 2140 MemberLoc, MemberDNLoc); 2141 } 2142 2143 bool isArrow() const { return IsArrow; } 2144 void setArrow(bool A) { IsArrow = A; } 2145 2146 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2147 /// location of 'F'. 2148 SourceLocation getMemberLoc() const { return MemberLoc; } 2149 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2150 2151 SourceRange getSourceRange() const; 2152 2153 SourceLocation getExprLoc() const { return MemberLoc; } 2154 2155 /// \brief Determine whether the base of this explicit is implicit. 2156 bool isImplicitAccess() const { 2157 return getBase() && getBase()->isImplicitCXXThis(); 2158 } 2159 2160 static bool classof(const Stmt *T) { 2161 return T->getStmtClass() == MemberExprClass; 2162 } 2163 static bool classof(const MemberExpr *) { return true; } 2164 2165 // Iterators 2166 child_range children() { return child_range(&Base, &Base+1); } 2167 2168 friend class ASTReader; 2169 friend class ASTStmtWriter; 2170}; 2171 2172/// CompoundLiteralExpr - [C99 6.5.2.5] 2173/// 2174class CompoundLiteralExpr : public Expr { 2175 /// LParenLoc - If non-null, this is the location of the left paren in a 2176 /// compound literal like "(int){4}". This can be null if this is a 2177 /// synthesized compound expression. 2178 SourceLocation LParenLoc; 2179 2180 /// The type as written. This can be an incomplete array type, in 2181 /// which case the actual expression type will be different. 2182 TypeSourceInfo *TInfo; 2183 Stmt *Init; 2184 bool FileScope; 2185public: 2186 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2187 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2188 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2189 tinfo->getType()->isDependentType(), 2190 init->isValueDependent(), 2191 init->containsUnexpandedParameterPack()), 2192 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2193 2194 /// \brief Construct an empty compound literal. 2195 explicit CompoundLiteralExpr(EmptyShell Empty) 2196 : Expr(CompoundLiteralExprClass, Empty) { } 2197 2198 const Expr *getInitializer() const { return cast<Expr>(Init); } 2199 Expr *getInitializer() { return cast<Expr>(Init); } 2200 void setInitializer(Expr *E) { Init = E; } 2201 2202 bool isFileScope() const { return FileScope; } 2203 void setFileScope(bool FS) { FileScope = FS; } 2204 2205 SourceLocation getLParenLoc() const { return LParenLoc; } 2206 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2207 2208 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2209 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2210 2211 SourceRange getSourceRange() const { 2212 // FIXME: Init should never be null. 2213 if (!Init) 2214 return SourceRange(); 2215 if (LParenLoc.isInvalid()) 2216 return Init->getSourceRange(); 2217 return SourceRange(LParenLoc, Init->getLocEnd()); 2218 } 2219 2220 static bool classof(const Stmt *T) { 2221 return T->getStmtClass() == CompoundLiteralExprClass; 2222 } 2223 static bool classof(const CompoundLiteralExpr *) { return true; } 2224 2225 // Iterators 2226 child_range children() { return child_range(&Init, &Init+1); } 2227}; 2228 2229/// CastExpr - Base class for type casts, including both implicit 2230/// casts (ImplicitCastExpr) and explicit casts that have some 2231/// representation in the source code (ExplicitCastExpr's derived 2232/// classes). 2233class CastExpr : public Expr { 2234public: 2235 typedef clang::CastKind CastKind; 2236 2237private: 2238 Stmt *Op; 2239 2240 void CheckCastConsistency() const { 2241#ifndef NDEBUG 2242 switch (getCastKind()) { 2243 case CK_DerivedToBase: 2244 case CK_UncheckedDerivedToBase: 2245 case CK_DerivedToBaseMemberPointer: 2246 case CK_BaseToDerived: 2247 case CK_BaseToDerivedMemberPointer: 2248 assert(!path_empty() && "Cast kind should have a base path!"); 2249 break; 2250 2251 // These should not have an inheritance path. 2252 case CK_BitCast: 2253 case CK_Dynamic: 2254 case CK_ToUnion: 2255 case CK_ArrayToPointerDecay: 2256 case CK_FunctionToPointerDecay: 2257 case CK_NullToMemberPointer: 2258 case CK_NullToPointer: 2259 case CK_ConstructorConversion: 2260 case CK_IntegralToPointer: 2261 case CK_PointerToIntegral: 2262 case CK_ToVoid: 2263 case CK_VectorSplat: 2264 case CK_IntegralCast: 2265 case CK_IntegralToFloating: 2266 case CK_FloatingToIntegral: 2267 case CK_FloatingCast: 2268 case CK_AnyPointerToObjCPointerCast: 2269 case CK_AnyPointerToBlockPointerCast: 2270 case CK_ObjCObjectLValueCast: 2271 case CK_FloatingRealToComplex: 2272 case CK_FloatingComplexToReal: 2273 case CK_FloatingComplexCast: 2274 case CK_FloatingComplexToIntegralComplex: 2275 case CK_IntegralRealToComplex: 2276 case CK_IntegralComplexToReal: 2277 case CK_IntegralComplexCast: 2278 case CK_IntegralComplexToFloatingComplex: 2279 case CK_ObjCProduceObject: 2280 case CK_ObjCConsumeObject: 2281 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 2282 // fallthrough to check for null base path 2283 2284 case CK_Dependent: 2285 case CK_LValueToRValue: 2286 case CK_GetObjCProperty: 2287 case CK_NoOp: 2288 case CK_PointerToBoolean: 2289 case CK_IntegralToBoolean: 2290 case CK_FloatingToBoolean: 2291 case CK_MemberPointerToBoolean: 2292 case CK_FloatingComplexToBoolean: 2293 case CK_IntegralComplexToBoolean: 2294 case CK_LValueBitCast: // -> bool& 2295 case CK_UserDefinedConversion: // operator bool() 2296 assert(path_empty() && "Cast kind should not have a base path!"); 2297 break; 2298 } 2299#endif 2300 } 2301 2302 const CXXBaseSpecifier * const *path_buffer() const { 2303 return const_cast<CastExpr*>(this)->path_buffer(); 2304 } 2305 CXXBaseSpecifier **path_buffer(); 2306 2307 void setBasePathSize(unsigned basePathSize) { 2308 CastExprBits.BasePathSize = basePathSize; 2309 assert(CastExprBits.BasePathSize == basePathSize && 2310 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2311 } 2312 2313protected: 2314 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2315 const CastKind kind, Expr *op, unsigned BasePathSize) : 2316 Expr(SC, ty, VK, OK_Ordinary, 2317 // Cast expressions are type-dependent if the type is 2318 // dependent (C++ [temp.dep.expr]p3). 2319 ty->isDependentType(), 2320 // Cast expressions are value-dependent if the type is 2321 // dependent or if the subexpression is value-dependent. 2322 ty->isDependentType() || (op && op->isValueDependent()), 2323 (ty->containsUnexpandedParameterPack() || 2324 op->containsUnexpandedParameterPack())), 2325 Op(op) { 2326 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2327 CastExprBits.Kind = kind; 2328 setBasePathSize(BasePathSize); 2329 CheckCastConsistency(); 2330 } 2331 2332 /// \brief Construct an empty cast. 2333 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2334 : Expr(SC, Empty) { 2335 setBasePathSize(BasePathSize); 2336 } 2337 2338public: 2339 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2340 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2341 const char *getCastKindName() const; 2342 2343 Expr *getSubExpr() { return cast<Expr>(Op); } 2344 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2345 void setSubExpr(Expr *E) { Op = E; } 2346 2347 /// \brief Retrieve the cast subexpression as it was written in the source 2348 /// code, looking through any implicit casts or other intermediate nodes 2349 /// introduced by semantic analysis. 2350 Expr *getSubExprAsWritten(); 2351 const Expr *getSubExprAsWritten() const { 2352 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2353 } 2354 2355 typedef CXXBaseSpecifier **path_iterator; 2356 typedef const CXXBaseSpecifier * const *path_const_iterator; 2357 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2358 unsigned path_size() const { return CastExprBits.BasePathSize; } 2359 path_iterator path_begin() { return path_buffer(); } 2360 path_iterator path_end() { return path_buffer() + path_size(); } 2361 path_const_iterator path_begin() const { return path_buffer(); } 2362 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2363 2364 void setCastPath(const CXXCastPath &Path); 2365 2366 static bool classof(const Stmt *T) { 2367 return T->getStmtClass() >= firstCastExprConstant && 2368 T->getStmtClass() <= lastCastExprConstant; 2369 } 2370 static bool classof(const CastExpr *) { return true; } 2371 2372 // Iterators 2373 child_range children() { return child_range(&Op, &Op+1); } 2374}; 2375 2376/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2377/// conversions, which have no direct representation in the original 2378/// source code. For example: converting T[]->T*, void f()->void 2379/// (*f)(), float->double, short->int, etc. 2380/// 2381/// In C, implicit casts always produce rvalues. However, in C++, an 2382/// implicit cast whose result is being bound to a reference will be 2383/// an lvalue or xvalue. For example: 2384/// 2385/// @code 2386/// class Base { }; 2387/// class Derived : public Base { }; 2388/// Derived &&ref(); 2389/// void f(Derived d) { 2390/// Base& b = d; // initializer is an ImplicitCastExpr 2391/// // to an lvalue of type Base 2392/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2393/// // to an xvalue of type Base 2394/// } 2395/// @endcode 2396class ImplicitCastExpr : public CastExpr { 2397private: 2398 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2399 unsigned BasePathLength, ExprValueKind VK) 2400 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2401 } 2402 2403 /// \brief Construct an empty implicit cast. 2404 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2405 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2406 2407public: 2408 enum OnStack_t { OnStack }; 2409 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2410 ExprValueKind VK) 2411 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2412 } 2413 2414 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2415 CastKind Kind, Expr *Operand, 2416 const CXXCastPath *BasePath, 2417 ExprValueKind Cat); 2418 2419 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2420 2421 SourceRange getSourceRange() const { 2422 return getSubExpr()->getSourceRange(); 2423 } 2424 2425 static bool classof(const Stmt *T) { 2426 return T->getStmtClass() == ImplicitCastExprClass; 2427 } 2428 static bool classof(const ImplicitCastExpr *) { return true; } 2429}; 2430 2431/// ExplicitCastExpr - An explicit cast written in the source 2432/// code. 2433/// 2434/// This class is effectively an abstract class, because it provides 2435/// the basic representation of an explicitly-written cast without 2436/// specifying which kind of cast (C cast, functional cast, static 2437/// cast, etc.) was written; specific derived classes represent the 2438/// particular style of cast and its location information. 2439/// 2440/// Unlike implicit casts, explicit cast nodes have two different 2441/// types: the type that was written into the source code, and the 2442/// actual type of the expression as determined by semantic 2443/// analysis. These types may differ slightly. For example, in C++ one 2444/// can cast to a reference type, which indicates that the resulting 2445/// expression will be an lvalue or xvalue. The reference type, however, 2446/// will not be used as the type of the expression. 2447class ExplicitCastExpr : public CastExpr { 2448 /// TInfo - Source type info for the (written) type 2449 /// this expression is casting to. 2450 TypeSourceInfo *TInfo; 2451 2452protected: 2453 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2454 CastKind kind, Expr *op, unsigned PathSize, 2455 TypeSourceInfo *writtenTy) 2456 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2457 2458 /// \brief Construct an empty explicit cast. 2459 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2460 : CastExpr(SC, Shell, PathSize) { } 2461 2462public: 2463 /// getTypeInfoAsWritten - Returns the type source info for the type 2464 /// that this expression is casting to. 2465 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2466 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2467 2468 /// getTypeAsWritten - Returns the type that this expression is 2469 /// casting to, as written in the source code. 2470 QualType getTypeAsWritten() const { return TInfo->getType(); } 2471 2472 static bool classof(const Stmt *T) { 2473 return T->getStmtClass() >= firstExplicitCastExprConstant && 2474 T->getStmtClass() <= lastExplicitCastExprConstant; 2475 } 2476 static bool classof(const ExplicitCastExpr *) { return true; } 2477}; 2478 2479/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2480/// cast in C++ (C++ [expr.cast]), which uses the syntax 2481/// (Type)expr. For example: @c (int)f. 2482class CStyleCastExpr : public ExplicitCastExpr { 2483 SourceLocation LPLoc; // the location of the left paren 2484 SourceLocation RPLoc; // the location of the right paren 2485 2486 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2487 unsigned PathSize, TypeSourceInfo *writtenTy, 2488 SourceLocation l, SourceLocation r) 2489 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2490 writtenTy), LPLoc(l), RPLoc(r) {} 2491 2492 /// \brief Construct an empty C-style explicit cast. 2493 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2494 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2495 2496public: 2497 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2498 ExprValueKind VK, CastKind K, 2499 Expr *Op, const CXXCastPath *BasePath, 2500 TypeSourceInfo *WrittenTy, SourceLocation L, 2501 SourceLocation R); 2502 2503 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2504 2505 SourceLocation getLParenLoc() const { return LPLoc; } 2506 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2507 2508 SourceLocation getRParenLoc() const { return RPLoc; } 2509 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2510 2511 SourceRange getSourceRange() const { 2512 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2513 } 2514 static bool classof(const Stmt *T) { 2515 return T->getStmtClass() == CStyleCastExprClass; 2516 } 2517 static bool classof(const CStyleCastExpr *) { return true; } 2518}; 2519 2520/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2521/// 2522/// This expression node kind describes a builtin binary operation, 2523/// such as "x + y" for integer values "x" and "y". The operands will 2524/// already have been converted to appropriate types (e.g., by 2525/// performing promotions or conversions). 2526/// 2527/// In C++, where operators may be overloaded, a different kind of 2528/// expression node (CXXOperatorCallExpr) is used to express the 2529/// invocation of an overloaded operator with operator syntax. Within 2530/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2531/// used to store an expression "x + y" depends on the subexpressions 2532/// for x and y. If neither x or y is type-dependent, and the "+" 2533/// operator resolves to a built-in operation, BinaryOperator will be 2534/// used to express the computation (x and y may still be 2535/// value-dependent). If either x or y is type-dependent, or if the 2536/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2537/// be used to express the computation. 2538class BinaryOperator : public Expr { 2539public: 2540 typedef BinaryOperatorKind Opcode; 2541 2542private: 2543 unsigned Opc : 6; 2544 SourceLocation OpLoc; 2545 2546 enum { LHS, RHS, END_EXPR }; 2547 Stmt* SubExprs[END_EXPR]; 2548public: 2549 2550 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2551 ExprValueKind VK, ExprObjectKind OK, 2552 SourceLocation opLoc) 2553 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2554 lhs->isTypeDependent() || rhs->isTypeDependent(), 2555 lhs->isValueDependent() || rhs->isValueDependent(), 2556 (lhs->containsUnexpandedParameterPack() || 2557 rhs->containsUnexpandedParameterPack())), 2558 Opc(opc), OpLoc(opLoc) { 2559 SubExprs[LHS] = lhs; 2560 SubExprs[RHS] = rhs; 2561 assert(!isCompoundAssignmentOp() && 2562 "Use ArithAssignBinaryOperator for compound assignments"); 2563 } 2564 2565 /// \brief Construct an empty binary operator. 2566 explicit BinaryOperator(EmptyShell Empty) 2567 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2568 2569 SourceLocation getOperatorLoc() const { return OpLoc; } 2570 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2571 2572 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2573 void setOpcode(Opcode O) { Opc = O; } 2574 2575 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2576 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2577 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2578 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2579 2580 SourceRange getSourceRange() const { 2581 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2582 } 2583 2584 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2585 /// corresponds to, e.g. "<<=". 2586 static const char *getOpcodeStr(Opcode Op); 2587 2588 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2589 2590 /// \brief Retrieve the binary opcode that corresponds to the given 2591 /// overloaded operator. 2592 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2593 2594 /// \brief Retrieve the overloaded operator kind that corresponds to 2595 /// the given binary opcode. 2596 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2597 2598 /// predicates to categorize the respective opcodes. 2599 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2600 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2601 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2602 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2603 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2604 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2605 2606 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2607 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2608 2609 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2610 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2611 2612 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2613 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2614 2615 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2616 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2617 2618 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2619 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2620 2621 static bool isAssignmentOp(Opcode Opc) { 2622 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2623 } 2624 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2625 2626 static bool isCompoundAssignmentOp(Opcode Opc) { 2627 return Opc > BO_Assign && Opc <= BO_OrAssign; 2628 } 2629 bool isCompoundAssignmentOp() const { 2630 return isCompoundAssignmentOp(getOpcode()); 2631 } 2632 2633 static bool isShiftAssignOp(Opcode Opc) { 2634 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2635 } 2636 bool isShiftAssignOp() const { 2637 return isShiftAssignOp(getOpcode()); 2638 } 2639 2640 static bool classof(const Stmt *S) { 2641 return S->getStmtClass() >= firstBinaryOperatorConstant && 2642 S->getStmtClass() <= lastBinaryOperatorConstant; 2643 } 2644 static bool classof(const BinaryOperator *) { return true; } 2645 2646 // Iterators 2647 child_range children() { 2648 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2649 } 2650 2651protected: 2652 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2653 ExprValueKind VK, ExprObjectKind OK, 2654 SourceLocation opLoc, bool dead) 2655 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2656 lhs->isTypeDependent() || rhs->isTypeDependent(), 2657 lhs->isValueDependent() || rhs->isValueDependent(), 2658 (lhs->containsUnexpandedParameterPack() || 2659 rhs->containsUnexpandedParameterPack())), 2660 Opc(opc), OpLoc(opLoc) { 2661 SubExprs[LHS] = lhs; 2662 SubExprs[RHS] = rhs; 2663 } 2664 2665 BinaryOperator(StmtClass SC, EmptyShell Empty) 2666 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2667}; 2668 2669/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2670/// track of the type the operation is performed in. Due to the semantics of 2671/// these operators, the operands are promoted, the aritmetic performed, an 2672/// implicit conversion back to the result type done, then the assignment takes 2673/// place. This captures the intermediate type which the computation is done 2674/// in. 2675class CompoundAssignOperator : public BinaryOperator { 2676 QualType ComputationLHSType; 2677 QualType ComputationResultType; 2678public: 2679 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2680 ExprValueKind VK, ExprObjectKind OK, 2681 QualType CompLHSType, QualType CompResultType, 2682 SourceLocation OpLoc) 2683 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2684 ComputationLHSType(CompLHSType), 2685 ComputationResultType(CompResultType) { 2686 assert(isCompoundAssignmentOp() && 2687 "Only should be used for compound assignments"); 2688 } 2689 2690 /// \brief Build an empty compound assignment operator expression. 2691 explicit CompoundAssignOperator(EmptyShell Empty) 2692 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2693 2694 // The two computation types are the type the LHS is converted 2695 // to for the computation and the type of the result; the two are 2696 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2697 QualType getComputationLHSType() const { return ComputationLHSType; } 2698 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2699 2700 QualType getComputationResultType() const { return ComputationResultType; } 2701 void setComputationResultType(QualType T) { ComputationResultType = T; } 2702 2703 static bool classof(const CompoundAssignOperator *) { return true; } 2704 static bool classof(const Stmt *S) { 2705 return S->getStmtClass() == CompoundAssignOperatorClass; 2706 } 2707}; 2708 2709/// AbstractConditionalOperator - An abstract base class for 2710/// ConditionalOperator and BinaryConditionalOperator. 2711class AbstractConditionalOperator : public Expr { 2712 SourceLocation QuestionLoc, ColonLoc; 2713 friend class ASTStmtReader; 2714 2715protected: 2716 AbstractConditionalOperator(StmtClass SC, QualType T, 2717 ExprValueKind VK, ExprObjectKind OK, 2718 bool TD, bool VD, 2719 bool ContainsUnexpandedParameterPack, 2720 SourceLocation qloc, 2721 SourceLocation cloc) 2722 : Expr(SC, T, VK, OK, TD, VD, ContainsUnexpandedParameterPack), 2723 QuestionLoc(qloc), ColonLoc(cloc) {} 2724 2725 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2726 : Expr(SC, Empty) { } 2727 2728public: 2729 // getCond - Return the expression representing the condition for 2730 // the ?: operator. 2731 Expr *getCond() const; 2732 2733 // getTrueExpr - Return the subexpression representing the value of 2734 // the expression if the condition evaluates to true. 2735 Expr *getTrueExpr() const; 2736 2737 // getFalseExpr - Return the subexpression representing the value of 2738 // the expression if the condition evaluates to false. This is 2739 // the same as getRHS. 2740 Expr *getFalseExpr() const; 2741 2742 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2743 SourceLocation getColonLoc() const { return ColonLoc; } 2744 2745 static bool classof(const Stmt *T) { 2746 return T->getStmtClass() == ConditionalOperatorClass || 2747 T->getStmtClass() == BinaryConditionalOperatorClass; 2748 } 2749 static bool classof(const AbstractConditionalOperator *) { return true; } 2750}; 2751 2752/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2753/// middle" extension is a BinaryConditionalOperator. 2754class ConditionalOperator : public AbstractConditionalOperator { 2755 enum { COND, LHS, RHS, END_EXPR }; 2756 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2757 2758 friend class ASTStmtReader; 2759public: 2760 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2761 SourceLocation CLoc, Expr *rhs, 2762 QualType t, ExprValueKind VK, ExprObjectKind OK) 2763 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 2764 // FIXME: the type of the conditional operator doesn't 2765 // depend on the type of the conditional, but the standard 2766 // seems to imply that it could. File a bug! 2767 (lhs->isTypeDependent() || rhs->isTypeDependent()), 2768 (cond->isValueDependent() || lhs->isValueDependent() || 2769 rhs->isValueDependent()), 2770 (cond->containsUnexpandedParameterPack() || 2771 lhs->containsUnexpandedParameterPack() || 2772 rhs->containsUnexpandedParameterPack()), 2773 QLoc, CLoc) { 2774 SubExprs[COND] = cond; 2775 SubExprs[LHS] = lhs; 2776 SubExprs[RHS] = rhs; 2777 } 2778 2779 /// \brief Build an empty conditional operator. 2780 explicit ConditionalOperator(EmptyShell Empty) 2781 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 2782 2783 // getCond - Return the expression representing the condition for 2784 // the ?: operator. 2785 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2786 2787 // getTrueExpr - Return the subexpression representing the value of 2788 // the expression if the condition evaluates to true. 2789 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 2790 2791 // getFalseExpr - Return the subexpression representing the value of 2792 // the expression if the condition evaluates to false. This is 2793 // the same as getRHS. 2794 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2795 2796 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2797 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2798 2799 SourceRange getSourceRange() const { 2800 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2801 } 2802 static bool classof(const Stmt *T) { 2803 return T->getStmtClass() == ConditionalOperatorClass; 2804 } 2805 static bool classof(const ConditionalOperator *) { return true; } 2806 2807 // Iterators 2808 child_range children() { 2809 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2810 } 2811}; 2812 2813/// BinaryConditionalOperator - The GNU extension to the conditional 2814/// operator which allows the middle operand to be omitted. 2815/// 2816/// This is a different expression kind on the assumption that almost 2817/// every client ends up needing to know that these are different. 2818class BinaryConditionalOperator : public AbstractConditionalOperator { 2819 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 2820 2821 /// - the common condition/left-hand-side expression, which will be 2822 /// evaluated as the opaque value 2823 /// - the condition, expressed in terms of the opaque value 2824 /// - the left-hand-side, expressed in terms of the opaque value 2825 /// - the right-hand-side 2826 Stmt *SubExprs[NUM_SUBEXPRS]; 2827 OpaqueValueExpr *OpaqueValue; 2828 2829 friend class ASTStmtReader; 2830public: 2831 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 2832 Expr *cond, Expr *lhs, Expr *rhs, 2833 SourceLocation qloc, SourceLocation cloc, 2834 QualType t, ExprValueKind VK, ExprObjectKind OK) 2835 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 2836 (common->isTypeDependent() || rhs->isTypeDependent()), 2837 (common->isValueDependent() || rhs->isValueDependent()), 2838 (common->containsUnexpandedParameterPack() || 2839 rhs->containsUnexpandedParameterPack()), 2840 qloc, cloc), 2841 OpaqueValue(opaqueValue) { 2842 SubExprs[COMMON] = common; 2843 SubExprs[COND] = cond; 2844 SubExprs[LHS] = lhs; 2845 SubExprs[RHS] = rhs; 2846 2847 OpaqueValue->setSourceExpr(common); 2848 } 2849 2850 /// \brief Build an empty conditional operator. 2851 explicit BinaryConditionalOperator(EmptyShell Empty) 2852 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 2853 2854 /// \brief getCommon - Return the common expression, written to the 2855 /// left of the condition. The opaque value will be bound to the 2856 /// result of this expression. 2857 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 2858 2859 /// \brief getOpaqueValue - Return the opaque value placeholder. 2860 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 2861 2862 /// \brief getCond - Return the condition expression; this is defined 2863 /// in terms of the opaque value. 2864 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2865 2866 /// \brief getTrueExpr - Return the subexpression which will be 2867 /// evaluated if the condition evaluates to true; this is defined 2868 /// in terms of the opaque value. 2869 Expr *getTrueExpr() const { 2870 return cast<Expr>(SubExprs[LHS]); 2871 } 2872 2873 /// \brief getFalseExpr - Return the subexpression which will be 2874 /// evaluated if the condnition evaluates to false; this is 2875 /// defined in terms of the opaque value. 2876 Expr *getFalseExpr() const { 2877 return cast<Expr>(SubExprs[RHS]); 2878 } 2879 2880 SourceRange getSourceRange() const { 2881 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 2882 } 2883 static bool classof(const Stmt *T) { 2884 return T->getStmtClass() == BinaryConditionalOperatorClass; 2885 } 2886 static bool classof(const BinaryConditionalOperator *) { return true; } 2887 2888 // Iterators 2889 child_range children() { 2890 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 2891 } 2892}; 2893 2894inline Expr *AbstractConditionalOperator::getCond() const { 2895 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2896 return co->getCond(); 2897 return cast<BinaryConditionalOperator>(this)->getCond(); 2898} 2899 2900inline Expr *AbstractConditionalOperator::getTrueExpr() const { 2901 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2902 return co->getTrueExpr(); 2903 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 2904} 2905 2906inline Expr *AbstractConditionalOperator::getFalseExpr() const { 2907 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2908 return co->getFalseExpr(); 2909 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 2910} 2911 2912/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2913class AddrLabelExpr : public Expr { 2914 SourceLocation AmpAmpLoc, LabelLoc; 2915 LabelDecl *Label; 2916public: 2917 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 2918 QualType t) 2919 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false), 2920 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2921 2922 /// \brief Build an empty address of a label expression. 2923 explicit AddrLabelExpr(EmptyShell Empty) 2924 : Expr(AddrLabelExprClass, Empty) { } 2925 2926 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2927 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2928 SourceLocation getLabelLoc() const { return LabelLoc; } 2929 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2930 2931 SourceRange getSourceRange() const { 2932 return SourceRange(AmpAmpLoc, LabelLoc); 2933 } 2934 2935 LabelDecl *getLabel() const { return Label; } 2936 void setLabel(LabelDecl *L) { Label = L; } 2937 2938 static bool classof(const Stmt *T) { 2939 return T->getStmtClass() == AddrLabelExprClass; 2940 } 2941 static bool classof(const AddrLabelExpr *) { return true; } 2942 2943 // Iterators 2944 child_range children() { return child_range(); } 2945}; 2946 2947/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2948/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2949/// takes the value of the last subexpression. 2950/// 2951/// A StmtExpr is always an r-value; values "returned" out of a 2952/// StmtExpr will be copied. 2953class StmtExpr : public Expr { 2954 Stmt *SubStmt; 2955 SourceLocation LParenLoc, RParenLoc; 2956public: 2957 // FIXME: Does type-dependence need to be computed differently? 2958 StmtExpr(CompoundStmt *substmt, QualType T, 2959 SourceLocation lp, SourceLocation rp) : 2960 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 2961 T->isDependentType(), false, false), 2962 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2963 2964 /// \brief Build an empty statement expression. 2965 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2966 2967 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2968 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2969 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2970 2971 SourceRange getSourceRange() const { 2972 return SourceRange(LParenLoc, RParenLoc); 2973 } 2974 2975 SourceLocation getLParenLoc() const { return LParenLoc; } 2976 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2977 SourceLocation getRParenLoc() const { return RParenLoc; } 2978 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2979 2980 static bool classof(const Stmt *T) { 2981 return T->getStmtClass() == StmtExprClass; 2982 } 2983 static bool classof(const StmtExpr *) { return true; } 2984 2985 // Iterators 2986 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 2987}; 2988 2989 2990/// ShuffleVectorExpr - clang-specific builtin-in function 2991/// __builtin_shufflevector. 2992/// This AST node represents a operator that does a constant 2993/// shuffle, similar to LLVM's shufflevector instruction. It takes 2994/// two vectors and a variable number of constant indices, 2995/// and returns the appropriately shuffled vector. 2996class ShuffleVectorExpr : public Expr { 2997 SourceLocation BuiltinLoc, RParenLoc; 2998 2999 // SubExprs - the list of values passed to the __builtin_shufflevector 3000 // function. The first two are vectors, and the rest are constant 3001 // indices. The number of values in this list is always 3002 // 2+the number of indices in the vector type. 3003 Stmt **SubExprs; 3004 unsigned NumExprs; 3005 3006public: 3007 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3008 QualType Type, SourceLocation BLoc, 3009 SourceLocation RP); 3010 3011 /// \brief Build an empty vector-shuffle expression. 3012 explicit ShuffleVectorExpr(EmptyShell Empty) 3013 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3014 3015 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3016 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3017 3018 SourceLocation getRParenLoc() const { return RParenLoc; } 3019 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3020 3021 SourceRange getSourceRange() const { 3022 return SourceRange(BuiltinLoc, RParenLoc); 3023 } 3024 static bool classof(const Stmt *T) { 3025 return T->getStmtClass() == ShuffleVectorExprClass; 3026 } 3027 static bool classof(const ShuffleVectorExpr *) { return true; } 3028 3029 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3030 /// constant expression, the actual arguments passed in, and the function 3031 /// pointers. 3032 unsigned getNumSubExprs() const { return NumExprs; } 3033 3034 /// \brief Retrieve the array of expressions. 3035 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3036 3037 /// getExpr - Return the Expr at the specified index. 3038 Expr *getExpr(unsigned Index) { 3039 assert((Index < NumExprs) && "Arg access out of range!"); 3040 return cast<Expr>(SubExprs[Index]); 3041 } 3042 const Expr *getExpr(unsigned Index) const { 3043 assert((Index < NumExprs) && "Arg access out of range!"); 3044 return cast<Expr>(SubExprs[Index]); 3045 } 3046 3047 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3048 3049 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3050 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3051 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 3052 } 3053 3054 // Iterators 3055 child_range children() { 3056 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3057 } 3058}; 3059 3060/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3061/// This AST node is similar to the conditional operator (?:) in C, with 3062/// the following exceptions: 3063/// - the test expression must be a integer constant expression. 3064/// - the expression returned acts like the chosen subexpression in every 3065/// visible way: the type is the same as that of the chosen subexpression, 3066/// and all predicates (whether it's an l-value, whether it's an integer 3067/// constant expression, etc.) return the same result as for the chosen 3068/// sub-expression. 3069class ChooseExpr : public Expr { 3070 enum { COND, LHS, RHS, END_EXPR }; 3071 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3072 SourceLocation BuiltinLoc, RParenLoc; 3073public: 3074 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3075 QualType t, ExprValueKind VK, ExprObjectKind OK, 3076 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3077 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3078 (cond->containsUnexpandedParameterPack() || 3079 lhs->containsUnexpandedParameterPack() || 3080 rhs->containsUnexpandedParameterPack())), 3081 BuiltinLoc(BLoc), RParenLoc(RP) { 3082 SubExprs[COND] = cond; 3083 SubExprs[LHS] = lhs; 3084 SubExprs[RHS] = rhs; 3085 } 3086 3087 /// \brief Build an empty __builtin_choose_expr. 3088 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3089 3090 /// isConditionTrue - Return whether the condition is true (i.e. not 3091 /// equal to zero). 3092 bool isConditionTrue(const ASTContext &C) const; 3093 3094 /// getChosenSubExpr - Return the subexpression chosen according to the 3095 /// condition. 3096 Expr *getChosenSubExpr(const ASTContext &C) const { 3097 return isConditionTrue(C) ? getLHS() : getRHS(); 3098 } 3099 3100 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3101 void setCond(Expr *E) { SubExprs[COND] = E; } 3102 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3103 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3104 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3105 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3106 3107 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3108 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3109 3110 SourceLocation getRParenLoc() const { return RParenLoc; } 3111 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3112 3113 SourceRange getSourceRange() const { 3114 return SourceRange(BuiltinLoc, RParenLoc); 3115 } 3116 static bool classof(const Stmt *T) { 3117 return T->getStmtClass() == ChooseExprClass; 3118 } 3119 static bool classof(const ChooseExpr *) { return true; } 3120 3121 // Iterators 3122 child_range children() { 3123 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3124 } 3125}; 3126 3127/// GNUNullExpr - Implements the GNU __null extension, which is a name 3128/// for a null pointer constant that has integral type (e.g., int or 3129/// long) and is the same size and alignment as a pointer. The __null 3130/// extension is typically only used by system headers, which define 3131/// NULL as __null in C++ rather than using 0 (which is an integer 3132/// that may not match the size of a pointer). 3133class GNUNullExpr : public Expr { 3134 /// TokenLoc - The location of the __null keyword. 3135 SourceLocation TokenLoc; 3136 3137public: 3138 GNUNullExpr(QualType Ty, SourceLocation Loc) 3139 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false), 3140 TokenLoc(Loc) { } 3141 3142 /// \brief Build an empty GNU __null expression. 3143 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3144 3145 /// getTokenLocation - The location of the __null token. 3146 SourceLocation getTokenLocation() const { return TokenLoc; } 3147 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3148 3149 SourceRange getSourceRange() const { 3150 return SourceRange(TokenLoc); 3151 } 3152 static bool classof(const Stmt *T) { 3153 return T->getStmtClass() == GNUNullExprClass; 3154 } 3155 static bool classof(const GNUNullExpr *) { return true; } 3156 3157 // Iterators 3158 child_range children() { return child_range(); } 3159}; 3160 3161/// VAArgExpr, used for the builtin function __builtin_va_arg. 3162class VAArgExpr : public Expr { 3163 Stmt *Val; 3164 TypeSourceInfo *TInfo; 3165 SourceLocation BuiltinLoc, RParenLoc; 3166public: 3167 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3168 SourceLocation RPLoc, QualType t) 3169 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3170 t->isDependentType(), false, 3171 (TInfo->getType()->containsUnexpandedParameterPack() || 3172 e->containsUnexpandedParameterPack())), 3173 Val(e), TInfo(TInfo), 3174 BuiltinLoc(BLoc), 3175 RParenLoc(RPLoc) { } 3176 3177 /// \brief Create an empty __builtin_va_arg expression. 3178 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3179 3180 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3181 Expr *getSubExpr() { return cast<Expr>(Val); } 3182 void setSubExpr(Expr *E) { Val = E; } 3183 3184 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3185 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3186 3187 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3188 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3189 3190 SourceLocation getRParenLoc() const { return RParenLoc; } 3191 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3192 3193 SourceRange getSourceRange() const { 3194 return SourceRange(BuiltinLoc, RParenLoc); 3195 } 3196 static bool classof(const Stmt *T) { 3197 return T->getStmtClass() == VAArgExprClass; 3198 } 3199 static bool classof(const VAArgExpr *) { return true; } 3200 3201 // Iterators 3202 child_range children() { return child_range(&Val, &Val+1); } 3203}; 3204 3205/// @brief Describes an C or C++ initializer list. 3206/// 3207/// InitListExpr describes an initializer list, which can be used to 3208/// initialize objects of different types, including 3209/// struct/class/union types, arrays, and vectors. For example: 3210/// 3211/// @code 3212/// struct foo x = { 1, { 2, 3 } }; 3213/// @endcode 3214/// 3215/// Prior to semantic analysis, an initializer list will represent the 3216/// initializer list as written by the user, but will have the 3217/// placeholder type "void". This initializer list is called the 3218/// syntactic form of the initializer, and may contain C99 designated 3219/// initializers (represented as DesignatedInitExprs), initializations 3220/// of subobject members without explicit braces, and so on. Clients 3221/// interested in the original syntax of the initializer list should 3222/// use the syntactic form of the initializer list. 3223/// 3224/// After semantic analysis, the initializer list will represent the 3225/// semantic form of the initializer, where the initializations of all 3226/// subobjects are made explicit with nested InitListExpr nodes and 3227/// C99 designators have been eliminated by placing the designated 3228/// initializations into the subobject they initialize. Additionally, 3229/// any "holes" in the initialization, where no initializer has been 3230/// specified for a particular subobject, will be replaced with 3231/// implicitly-generated ImplicitValueInitExpr expressions that 3232/// value-initialize the subobjects. Note, however, that the 3233/// initializer lists may still have fewer initializers than there are 3234/// elements to initialize within the object. 3235/// 3236/// Given the semantic form of the initializer list, one can retrieve 3237/// the original syntactic form of that initializer list (if it 3238/// exists) using getSyntacticForm(). Since many initializer lists 3239/// have the same syntactic and semantic forms, getSyntacticForm() may 3240/// return NULL, indicating that the current initializer list also 3241/// serves as its syntactic form. 3242class InitListExpr : public Expr { 3243 // FIXME: Eliminate this vector in favor of ASTContext allocation 3244 typedef ASTVector<Stmt *> InitExprsTy; 3245 InitExprsTy InitExprs; 3246 SourceLocation LBraceLoc, RBraceLoc; 3247 3248 /// Contains the initializer list that describes the syntactic form 3249 /// written in the source code. 3250 InitListExpr *SyntacticForm; 3251 3252 /// \brief Either: 3253 /// If this initializer list initializes an array with more elements than 3254 /// there are initializers in the list, specifies an expression to be used 3255 /// for value initialization of the rest of the elements. 3256 /// Or 3257 /// If this initializer list initializes a union, specifies which 3258 /// field within the union will be initialized. 3259 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3260 3261 /// Whether this initializer list originally had a GNU array-range 3262 /// designator in it. This is a temporary marker used by CodeGen. 3263 bool HadArrayRangeDesignator; 3264 3265public: 3266 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3267 Expr **initexprs, unsigned numinits, 3268 SourceLocation rbraceloc); 3269 3270 /// \brief Build an empty initializer list. 3271 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3272 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3273 3274 unsigned getNumInits() const { return InitExprs.size(); } 3275 3276 /// \brief Retrieve the set of initializers. 3277 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3278 3279 const Expr *getInit(unsigned Init) const { 3280 assert(Init < getNumInits() && "Initializer access out of range!"); 3281 return cast_or_null<Expr>(InitExprs[Init]); 3282 } 3283 3284 Expr *getInit(unsigned Init) { 3285 assert(Init < getNumInits() && "Initializer access out of range!"); 3286 return cast_or_null<Expr>(InitExprs[Init]); 3287 } 3288 3289 void setInit(unsigned Init, Expr *expr) { 3290 assert(Init < getNumInits() && "Initializer access out of range!"); 3291 InitExprs[Init] = expr; 3292 } 3293 3294 /// \brief Reserve space for some number of initializers. 3295 void reserveInits(ASTContext &C, unsigned NumInits); 3296 3297 /// @brief Specify the number of initializers 3298 /// 3299 /// If there are more than @p NumInits initializers, the remaining 3300 /// initializers will be destroyed. If there are fewer than @p 3301 /// NumInits initializers, NULL expressions will be added for the 3302 /// unknown initializers. 3303 void resizeInits(ASTContext &Context, unsigned NumInits); 3304 3305 /// @brief Updates the initializer at index @p Init with the new 3306 /// expression @p expr, and returns the old expression at that 3307 /// location. 3308 /// 3309 /// When @p Init is out of range for this initializer list, the 3310 /// initializer list will be extended with NULL expressions to 3311 /// accommodate the new entry. 3312 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3313 3314 /// \brief If this initializer list initializes an array with more elements 3315 /// than there are initializers in the list, specifies an expression to be 3316 /// used for value initialization of the rest of the elements. 3317 Expr *getArrayFiller() { 3318 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3319 } 3320 const Expr *getArrayFiller() const { 3321 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3322 } 3323 void setArrayFiller(Expr *filler); 3324 3325 /// \brief If this initializes a union, specifies which field in the 3326 /// union to initialize. 3327 /// 3328 /// Typically, this field is the first named field within the 3329 /// union. However, a designated initializer can specify the 3330 /// initialization of a different field within the union. 3331 FieldDecl *getInitializedFieldInUnion() { 3332 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3333 } 3334 const FieldDecl *getInitializedFieldInUnion() const { 3335 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3336 } 3337 void setInitializedFieldInUnion(FieldDecl *FD) { 3338 ArrayFillerOrUnionFieldInit = FD; 3339 } 3340 3341 // Explicit InitListExpr's originate from source code (and have valid source 3342 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3343 bool isExplicit() { 3344 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3345 } 3346 3347 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3348 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3349 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3350 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3351 3352 /// @brief Retrieve the initializer list that describes the 3353 /// syntactic form of the initializer. 3354 /// 3355 /// 3356 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3357 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3358 3359 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3360 void sawArrayRangeDesignator(bool ARD = true) { 3361 HadArrayRangeDesignator = ARD; 3362 } 3363 3364 SourceRange getSourceRange() const; 3365 3366 static bool classof(const Stmt *T) { 3367 return T->getStmtClass() == InitListExprClass; 3368 } 3369 static bool classof(const InitListExpr *) { return true; } 3370 3371 // Iterators 3372 child_range children() { 3373 if (InitExprs.empty()) return child_range(); 3374 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3375 } 3376 3377 typedef InitExprsTy::iterator iterator; 3378 typedef InitExprsTy::const_iterator const_iterator; 3379 typedef InitExprsTy::reverse_iterator reverse_iterator; 3380 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3381 3382 iterator begin() { return InitExprs.begin(); } 3383 const_iterator begin() const { return InitExprs.begin(); } 3384 iterator end() { return InitExprs.end(); } 3385 const_iterator end() const { return InitExprs.end(); } 3386 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3387 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3388 reverse_iterator rend() { return InitExprs.rend(); } 3389 const_reverse_iterator rend() const { return InitExprs.rend(); } 3390 3391 friend class ASTStmtReader; 3392 friend class ASTStmtWriter; 3393}; 3394 3395/// @brief Represents a C99 designated initializer expression. 3396/// 3397/// A designated initializer expression (C99 6.7.8) contains one or 3398/// more designators (which can be field designators, array 3399/// designators, or GNU array-range designators) followed by an 3400/// expression that initializes the field or element(s) that the 3401/// designators refer to. For example, given: 3402/// 3403/// @code 3404/// struct point { 3405/// double x; 3406/// double y; 3407/// }; 3408/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3409/// @endcode 3410/// 3411/// The InitListExpr contains three DesignatedInitExprs, the first of 3412/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3413/// designators, one array designator for @c [2] followed by one field 3414/// designator for @c .y. The initalization expression will be 1.0. 3415class DesignatedInitExpr : public Expr { 3416public: 3417 /// \brief Forward declaration of the Designator class. 3418 class Designator; 3419 3420private: 3421 /// The location of the '=' or ':' prior to the actual initializer 3422 /// expression. 3423 SourceLocation EqualOrColonLoc; 3424 3425 /// Whether this designated initializer used the GNU deprecated 3426 /// syntax rather than the C99 '=' syntax. 3427 bool GNUSyntax : 1; 3428 3429 /// The number of designators in this initializer expression. 3430 unsigned NumDesignators : 15; 3431 3432 /// \brief The designators in this designated initialization 3433 /// expression. 3434 Designator *Designators; 3435 3436 /// The number of subexpressions of this initializer expression, 3437 /// which contains both the initializer and any additional 3438 /// expressions used by array and array-range designators. 3439 unsigned NumSubExprs : 16; 3440 3441 3442 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3443 const Designator *Designators, 3444 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3445 Expr **IndexExprs, unsigned NumIndexExprs, 3446 Expr *Init); 3447 3448 explicit DesignatedInitExpr(unsigned NumSubExprs) 3449 : Expr(DesignatedInitExprClass, EmptyShell()), 3450 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3451 3452public: 3453 /// A field designator, e.g., ".x". 3454 struct FieldDesignator { 3455 /// Refers to the field that is being initialized. The low bit 3456 /// of this field determines whether this is actually a pointer 3457 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3458 /// initially constructed, a field designator will store an 3459 /// IdentifierInfo*. After semantic analysis has resolved that 3460 /// name, the field designator will instead store a FieldDecl*. 3461 uintptr_t NameOrField; 3462 3463 /// The location of the '.' in the designated initializer. 3464 unsigned DotLoc; 3465 3466 /// The location of the field name in the designated initializer. 3467 unsigned FieldLoc; 3468 }; 3469 3470 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3471 struct ArrayOrRangeDesignator { 3472 /// Location of the first index expression within the designated 3473 /// initializer expression's list of subexpressions. 3474 unsigned Index; 3475 /// The location of the '[' starting the array range designator. 3476 unsigned LBracketLoc; 3477 /// The location of the ellipsis separating the start and end 3478 /// indices. Only valid for GNU array-range designators. 3479 unsigned EllipsisLoc; 3480 /// The location of the ']' terminating the array range designator. 3481 unsigned RBracketLoc; 3482 }; 3483 3484 /// @brief Represents a single C99 designator. 3485 /// 3486 /// @todo This class is infuriatingly similar to clang::Designator, 3487 /// but minor differences (storing indices vs. storing pointers) 3488 /// keep us from reusing it. Try harder, later, to rectify these 3489 /// differences. 3490 class Designator { 3491 /// @brief The kind of designator this describes. 3492 enum { 3493 FieldDesignator, 3494 ArrayDesignator, 3495 ArrayRangeDesignator 3496 } Kind; 3497 3498 union { 3499 /// A field designator, e.g., ".x". 3500 struct FieldDesignator Field; 3501 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3502 struct ArrayOrRangeDesignator ArrayOrRange; 3503 }; 3504 friend class DesignatedInitExpr; 3505 3506 public: 3507 Designator() {} 3508 3509 /// @brief Initializes a field designator. 3510 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3511 SourceLocation FieldLoc) 3512 : Kind(FieldDesignator) { 3513 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3514 Field.DotLoc = DotLoc.getRawEncoding(); 3515 Field.FieldLoc = FieldLoc.getRawEncoding(); 3516 } 3517 3518 /// @brief Initializes an array designator. 3519 Designator(unsigned Index, SourceLocation LBracketLoc, 3520 SourceLocation RBracketLoc) 3521 : Kind(ArrayDesignator) { 3522 ArrayOrRange.Index = Index; 3523 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3524 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3525 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3526 } 3527 3528 /// @brief Initializes a GNU array-range designator. 3529 Designator(unsigned Index, SourceLocation LBracketLoc, 3530 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3531 : Kind(ArrayRangeDesignator) { 3532 ArrayOrRange.Index = Index; 3533 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3534 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3535 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3536 } 3537 3538 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3539 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3540 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3541 3542 IdentifierInfo * getFieldName(); 3543 3544 FieldDecl *getField() { 3545 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3546 if (Field.NameOrField & 0x01) 3547 return 0; 3548 else 3549 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3550 } 3551 3552 void setField(FieldDecl *FD) { 3553 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3554 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3555 } 3556 3557 SourceLocation getDotLoc() const { 3558 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3559 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3560 } 3561 3562 SourceLocation getFieldLoc() const { 3563 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3564 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3565 } 3566 3567 SourceLocation getLBracketLoc() const { 3568 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3569 "Only valid on an array or array-range designator"); 3570 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3571 } 3572 3573 SourceLocation getRBracketLoc() const { 3574 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3575 "Only valid on an array or array-range designator"); 3576 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3577 } 3578 3579 SourceLocation getEllipsisLoc() const { 3580 assert(Kind == ArrayRangeDesignator && 3581 "Only valid on an array-range designator"); 3582 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3583 } 3584 3585 unsigned getFirstExprIndex() const { 3586 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3587 "Only valid on an array or array-range designator"); 3588 return ArrayOrRange.Index; 3589 } 3590 3591 SourceLocation getStartLocation() const { 3592 if (Kind == FieldDesignator) 3593 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3594 else 3595 return getLBracketLoc(); 3596 } 3597 SourceLocation getEndLocation() const { 3598 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3599 } 3600 SourceRange getSourceRange() const { 3601 return SourceRange(getStartLocation(), getEndLocation()); 3602 } 3603 }; 3604 3605 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3606 unsigned NumDesignators, 3607 Expr **IndexExprs, unsigned NumIndexExprs, 3608 SourceLocation EqualOrColonLoc, 3609 bool GNUSyntax, Expr *Init); 3610 3611 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3612 3613 /// @brief Returns the number of designators in this initializer. 3614 unsigned size() const { return NumDesignators; } 3615 3616 // Iterator access to the designators. 3617 typedef Designator* designators_iterator; 3618 designators_iterator designators_begin() { return Designators; } 3619 designators_iterator designators_end() { 3620 return Designators + NumDesignators; 3621 } 3622 3623 typedef std::reverse_iterator<designators_iterator> 3624 reverse_designators_iterator; 3625 reverse_designators_iterator designators_rbegin() { 3626 return reverse_designators_iterator(designators_end()); 3627 } 3628 reverse_designators_iterator designators_rend() { 3629 return reverse_designators_iterator(designators_begin()); 3630 } 3631 3632 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3633 3634 void setDesignators(ASTContext &C, const Designator *Desigs, 3635 unsigned NumDesigs); 3636 3637 Expr *getArrayIndex(const Designator& D); 3638 Expr *getArrayRangeStart(const Designator& D); 3639 Expr *getArrayRangeEnd(const Designator& D); 3640 3641 /// @brief Retrieve the location of the '=' that precedes the 3642 /// initializer value itself, if present. 3643 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3644 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3645 3646 /// @brief Determines whether this designated initializer used the 3647 /// deprecated GNU syntax for designated initializers. 3648 bool usesGNUSyntax() const { return GNUSyntax; } 3649 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3650 3651 /// @brief Retrieve the initializer value. 3652 Expr *getInit() const { 3653 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3654 } 3655 3656 void setInit(Expr *init) { 3657 *child_begin() = init; 3658 } 3659 3660 /// \brief Retrieve the total number of subexpressions in this 3661 /// designated initializer expression, including the actual 3662 /// initialized value and any expressions that occur within array 3663 /// and array-range designators. 3664 unsigned getNumSubExprs() const { return NumSubExprs; } 3665 3666 Expr *getSubExpr(unsigned Idx) { 3667 assert(Idx < NumSubExprs && "Subscript out of range"); 3668 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3669 Ptr += sizeof(DesignatedInitExpr); 3670 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3671 } 3672 3673 void setSubExpr(unsigned Idx, Expr *E) { 3674 assert(Idx < NumSubExprs && "Subscript out of range"); 3675 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3676 Ptr += sizeof(DesignatedInitExpr); 3677 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3678 } 3679 3680 /// \brief Replaces the designator at index @p Idx with the series 3681 /// of designators in [First, Last). 3682 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3683 const Designator *Last); 3684 3685 SourceRange getDesignatorsSourceRange() const; 3686 3687 SourceRange getSourceRange() const; 3688 3689 static bool classof(const Stmt *T) { 3690 return T->getStmtClass() == DesignatedInitExprClass; 3691 } 3692 static bool classof(const DesignatedInitExpr *) { return true; } 3693 3694 // Iterators 3695 child_range children() { 3696 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3697 return child_range(begin, begin + NumSubExprs); 3698 } 3699}; 3700 3701/// \brief Represents an implicitly-generated value initialization of 3702/// an object of a given type. 3703/// 3704/// Implicit value initializations occur within semantic initializer 3705/// list expressions (InitListExpr) as placeholders for subobject 3706/// initializations not explicitly specified by the user. 3707/// 3708/// \see InitListExpr 3709class ImplicitValueInitExpr : public Expr { 3710public: 3711 explicit ImplicitValueInitExpr(QualType ty) 3712 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3713 false, false, false) { } 3714 3715 /// \brief Construct an empty implicit value initialization. 3716 explicit ImplicitValueInitExpr(EmptyShell Empty) 3717 : Expr(ImplicitValueInitExprClass, Empty) { } 3718 3719 static bool classof(const Stmt *T) { 3720 return T->getStmtClass() == ImplicitValueInitExprClass; 3721 } 3722 static bool classof(const ImplicitValueInitExpr *) { return true; } 3723 3724 SourceRange getSourceRange() const { 3725 return SourceRange(); 3726 } 3727 3728 // Iterators 3729 child_range children() { return child_range(); } 3730}; 3731 3732 3733class ParenListExpr : public Expr { 3734 Stmt **Exprs; 3735 unsigned NumExprs; 3736 SourceLocation LParenLoc, RParenLoc; 3737 3738public: 3739 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3740 unsigned numexprs, SourceLocation rparenloc); 3741 3742 /// \brief Build an empty paren list. 3743 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3744 3745 unsigned getNumExprs() const { return NumExprs; } 3746 3747 const Expr* getExpr(unsigned Init) const { 3748 assert(Init < getNumExprs() && "Initializer access out of range!"); 3749 return cast_or_null<Expr>(Exprs[Init]); 3750 } 3751 3752 Expr* getExpr(unsigned Init) { 3753 assert(Init < getNumExprs() && "Initializer access out of range!"); 3754 return cast_or_null<Expr>(Exprs[Init]); 3755 } 3756 3757 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3758 3759 SourceLocation getLParenLoc() const { return LParenLoc; } 3760 SourceLocation getRParenLoc() const { return RParenLoc; } 3761 3762 SourceRange getSourceRange() const { 3763 return SourceRange(LParenLoc, RParenLoc); 3764 } 3765 static bool classof(const Stmt *T) { 3766 return T->getStmtClass() == ParenListExprClass; 3767 } 3768 static bool classof(const ParenListExpr *) { return true; } 3769 3770 // Iterators 3771 child_range children() { 3772 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 3773 } 3774 3775 friend class ASTStmtReader; 3776 friend class ASTStmtWriter; 3777}; 3778 3779 3780/// \brief Represents a C1X generic selection. 3781/// 3782/// A generic selection (C1X 6.5.1.1) contains an unevaluated controlling 3783/// expression, followed by one or more generic associations. Each generic 3784/// association specifies a type name and an expression, or "default" and an 3785/// expression (in which case it is known as a default generic association). 3786/// The type and value of the generic selection are identical to those of its 3787/// result expression, which is defined as the expression in the generic 3788/// association with a type name that is compatible with the type of the 3789/// controlling expression, or the expression in the default generic association 3790/// if no types are compatible. For example: 3791/// 3792/// @code 3793/// _Generic(X, double: 1, float: 2, default: 3) 3794/// @endcode 3795/// 3796/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 3797/// or 3 if "hello". 3798/// 3799/// As an extension, generic selections are allowed in C++, where the following 3800/// additional semantics apply: 3801/// 3802/// Any generic selection whose controlling expression is type-dependent or 3803/// which names a dependent type in its association list is result-dependent, 3804/// which means that the choice of result expression is dependent. 3805/// Result-dependent generic associations are both type- and value-dependent. 3806class GenericSelectionExpr : public Expr { 3807 enum { CONTROLLING, END_EXPR }; 3808 TypeSourceInfo **AssocTypes; 3809 Stmt **SubExprs; 3810 unsigned NumAssocs, ResultIndex; 3811 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 3812 3813public: 3814 GenericSelectionExpr(ASTContext &Context, 3815 SourceLocation GenericLoc, Expr *ControllingExpr, 3816 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3817 unsigned NumAssocs, SourceLocation DefaultLoc, 3818 SourceLocation RParenLoc, 3819 bool ContainsUnexpandedParameterPack, 3820 unsigned ResultIndex); 3821 3822 /// This constructor is used in the result-dependent case. 3823 GenericSelectionExpr(ASTContext &Context, 3824 SourceLocation GenericLoc, Expr *ControllingExpr, 3825 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3826 unsigned NumAssocs, SourceLocation DefaultLoc, 3827 SourceLocation RParenLoc, 3828 bool ContainsUnexpandedParameterPack); 3829 3830 explicit GenericSelectionExpr(EmptyShell Empty) 3831 : Expr(GenericSelectionExprClass, Empty) { } 3832 3833 unsigned getNumAssocs() const { return NumAssocs; } 3834 3835 SourceLocation getGenericLoc() const { return GenericLoc; } 3836 SourceLocation getDefaultLoc() const { return DefaultLoc; } 3837 SourceLocation getRParenLoc() const { return RParenLoc; } 3838 3839 const Expr *getAssocExpr(unsigned i) const { 3840 return cast<Expr>(SubExprs[END_EXPR+i]); 3841 } 3842 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 3843 3844 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 3845 return AssocTypes[i]; 3846 } 3847 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 3848 3849 QualType getAssocType(unsigned i) const { 3850 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 3851 return TS->getType(); 3852 else 3853 return QualType(); 3854 } 3855 3856 const Expr *getControllingExpr() const { 3857 return cast<Expr>(SubExprs[CONTROLLING]); 3858 } 3859 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 3860 3861 /// Whether this generic selection is result-dependent. 3862 bool isResultDependent() const { return ResultIndex == -1U; } 3863 3864 /// The zero-based index of the result expression's generic association in 3865 /// the generic selection's association list. Defined only if the 3866 /// generic selection is not result-dependent. 3867 unsigned getResultIndex() const { 3868 assert(!isResultDependent() && "Generic selection is result-dependent"); 3869 return ResultIndex; 3870 } 3871 3872 /// The generic selection's result expression. Defined only if the 3873 /// generic selection is not result-dependent. 3874 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 3875 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 3876 3877 SourceRange getSourceRange() const { 3878 return SourceRange(GenericLoc, RParenLoc); 3879 } 3880 static bool classof(const Stmt *T) { 3881 return T->getStmtClass() == GenericSelectionExprClass; 3882 } 3883 static bool classof(const GenericSelectionExpr *) { return true; } 3884 3885 child_range children() { 3886 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 3887 } 3888 3889 friend class ASTStmtReader; 3890}; 3891 3892//===----------------------------------------------------------------------===// 3893// Clang Extensions 3894//===----------------------------------------------------------------------===// 3895 3896 3897/// ExtVectorElementExpr - This represents access to specific elements of a 3898/// vector, and may occur on the left hand side or right hand side. For example 3899/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3900/// 3901/// Note that the base may have either vector or pointer to vector type, just 3902/// like a struct field reference. 3903/// 3904class ExtVectorElementExpr : public Expr { 3905 Stmt *Base; 3906 IdentifierInfo *Accessor; 3907 SourceLocation AccessorLoc; 3908public: 3909 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 3910 IdentifierInfo &accessor, SourceLocation loc) 3911 : Expr(ExtVectorElementExprClass, ty, VK, 3912 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 3913 base->isTypeDependent(), base->isValueDependent(), 3914 base->containsUnexpandedParameterPack()), 3915 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3916 3917 /// \brief Build an empty vector element expression. 3918 explicit ExtVectorElementExpr(EmptyShell Empty) 3919 : Expr(ExtVectorElementExprClass, Empty) { } 3920 3921 const Expr *getBase() const { return cast<Expr>(Base); } 3922 Expr *getBase() { return cast<Expr>(Base); } 3923 void setBase(Expr *E) { Base = E; } 3924 3925 IdentifierInfo &getAccessor() const { return *Accessor; } 3926 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3927 3928 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3929 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3930 3931 /// getNumElements - Get the number of components being selected. 3932 unsigned getNumElements() const; 3933 3934 /// containsDuplicateElements - Return true if any element access is 3935 /// repeated. 3936 bool containsDuplicateElements() const; 3937 3938 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3939 /// aggregate Constant of ConstantInt(s). 3940 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3941 3942 SourceRange getSourceRange() const { 3943 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3944 } 3945 3946 /// isArrow - Return true if the base expression is a pointer to vector, 3947 /// return false if the base expression is a vector. 3948 bool isArrow() const; 3949 3950 static bool classof(const Stmt *T) { 3951 return T->getStmtClass() == ExtVectorElementExprClass; 3952 } 3953 static bool classof(const ExtVectorElementExpr *) { return true; } 3954 3955 // Iterators 3956 child_range children() { return child_range(&Base, &Base+1); } 3957}; 3958 3959 3960/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3961/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3962class BlockExpr : public Expr { 3963protected: 3964 BlockDecl *TheBlock; 3965public: 3966 BlockExpr(BlockDecl *BD, QualType ty) 3967 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 3968 ty->isDependentType(), false, false), 3969 TheBlock(BD) {} 3970 3971 /// \brief Build an empty block expression. 3972 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3973 3974 const BlockDecl *getBlockDecl() const { return TheBlock; } 3975 BlockDecl *getBlockDecl() { return TheBlock; } 3976 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3977 3978 // Convenience functions for probing the underlying BlockDecl. 3979 SourceLocation getCaretLocation() const; 3980 const Stmt *getBody() const; 3981 Stmt *getBody(); 3982 3983 SourceRange getSourceRange() const { 3984 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3985 } 3986 3987 /// getFunctionType - Return the underlying function type for this block. 3988 const FunctionType *getFunctionType() const; 3989 3990 static bool classof(const Stmt *T) { 3991 return T->getStmtClass() == BlockExprClass; 3992 } 3993 static bool classof(const BlockExpr *) { return true; } 3994 3995 // Iterators 3996 child_range children() { return child_range(); } 3997}; 3998 3999/// BlockDeclRefExpr - A reference to a local variable declared in an 4000/// enclosing scope. 4001class BlockDeclRefExpr : public Expr { 4002 VarDecl *D; 4003 SourceLocation Loc; 4004 bool IsByRef : 1; 4005 bool ConstQualAdded : 1; 4006public: 4007 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 4008 SourceLocation l, bool ByRef, bool constAdded = false); 4009 4010 // \brief Build an empty reference to a declared variable in a 4011 // block. 4012 explicit BlockDeclRefExpr(EmptyShell Empty) 4013 : Expr(BlockDeclRefExprClass, Empty) { } 4014 4015 VarDecl *getDecl() { return D; } 4016 const VarDecl *getDecl() const { return D; } 4017 void setDecl(VarDecl *VD) { D = VD; } 4018 4019 SourceLocation getLocation() const { return Loc; } 4020 void setLocation(SourceLocation L) { Loc = L; } 4021 4022 SourceRange getSourceRange() const { return SourceRange(Loc); } 4023 4024 bool isByRef() const { return IsByRef; } 4025 void setByRef(bool BR) { IsByRef = BR; } 4026 4027 bool isConstQualAdded() const { return ConstQualAdded; } 4028 void setConstQualAdded(bool C) { ConstQualAdded = C; } 4029 4030 static bool classof(const Stmt *T) { 4031 return T->getStmtClass() == BlockDeclRefExprClass; 4032 } 4033 static bool classof(const BlockDeclRefExpr *) { return true; } 4034 4035 // Iterators 4036 child_range children() { return child_range(); } 4037}; 4038 4039/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4040/// This AST node provides support for reinterpreting a type to another 4041/// type of the same size. 4042class AsTypeExpr : public Expr { 4043private: 4044 Expr* SrcExpr; 4045 QualType DstType; 4046 SourceLocation BuiltinLoc, RParenLoc; 4047 4048public: 4049 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4050 ExprValueKind VK, ExprObjectKind OK, 4051 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4052 : Expr(AsTypeExprClass, DstType, VK, OK, false, false, false), 4053 SrcExpr(SrcExpr), DstType(DstType), 4054 BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4055 4056 /// \brief Build an empty __builtin_astype 4057 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4058 4059 /// getSrcExpr - Return the Expr to be converted. 4060 Expr *getSrcExpr() const { return SrcExpr; } 4061 QualType getDstType() const { return DstType; } 4062 4063 SourceRange getSourceRange() const { 4064 return SourceRange(BuiltinLoc, RParenLoc); 4065 } 4066 4067 static bool classof(const Stmt *T) { 4068 return T->getStmtClass() == AsTypeExprClass; 4069 } 4070 static bool classof(const AsTypeExpr *) { return true; } 4071 4072 // Iterators 4073 child_range children() { return child_range(); } 4074}; 4075} // end namespace clang 4076 4077#endif 4078