Expr.h revision 0d9106fc97cde979a995e26b18bcd2643f8afb55
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, llvm::StringRef Str, bool Wide, 1209 bool Pascal, QualType Ty, 1210 const SourceLocation *Loc, unsigned NumStrs); 1211 1212 /// Simple constructor for string literals made from one token. 1213 static StringLiteral *Create(ASTContext &C, llvm::StringRef Str, bool Wide, 1214 bool Pascal, QualType Ty, SourceLocation Loc) { 1215 return Create(C, Str, Wide, Pascal, Ty, &Loc, 1); 1216 } 1217 1218 /// \brief Construct an empty string literal. 1219 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1220 1221 llvm::StringRef getString() const { 1222 return llvm::StringRef(StrData, ByteLength); 1223 } 1224 1225 unsigned getByteLength() const { return ByteLength; } 1226 1227 /// \brief Sets the string data to the given string data. 1228 void setString(ASTContext &C, llvm::StringRef Str); 1229 1230 bool isWide() const { return IsWide; } 1231 bool isPascal() const { return IsPascal; } 1232 1233 bool containsNonAsciiOrNull() const { 1234 llvm::StringRef Str = getString(); 1235 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1236 if (!isascii(Str[i]) || !Str[i]) 1237 return true; 1238 return false; 1239 } 1240 /// getNumConcatenated - Get the number of string literal tokens that were 1241 /// concatenated in translation phase #6 to form this string literal. 1242 unsigned getNumConcatenated() const { return NumConcatenated; } 1243 1244 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1245 assert(TokNum < NumConcatenated && "Invalid tok number"); 1246 return TokLocs[TokNum]; 1247 } 1248 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1249 assert(TokNum < NumConcatenated && "Invalid tok number"); 1250 TokLocs[TokNum] = L; 1251 } 1252 1253 /// getLocationOfByte - Return a source location that points to the specified 1254 /// byte of this string literal. 1255 /// 1256 /// Strings are amazingly complex. They can be formed from multiple tokens 1257 /// and can have escape sequences in them in addition to the usual trigraph 1258 /// and escaped newline business. This routine handles this complexity. 1259 /// 1260 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1261 const LangOptions &Features, 1262 const TargetInfo &Target) const; 1263 1264 typedef const SourceLocation *tokloc_iterator; 1265 tokloc_iterator tokloc_begin() const { return TokLocs; } 1266 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1267 1268 SourceRange getSourceRange() const { 1269 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1270 } 1271 static bool classof(const Stmt *T) { 1272 return T->getStmtClass() == StringLiteralClass; 1273 } 1274 static bool classof(const StringLiteral *) { return true; } 1275 1276 // Iterators 1277 child_range children() { return child_range(); } 1278}; 1279 1280/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1281/// AST node is only formed if full location information is requested. 1282class ParenExpr : public Expr { 1283 SourceLocation L, R; 1284 Stmt *Val; 1285public: 1286 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1287 : Expr(ParenExprClass, val->getType(), 1288 val->getValueKind(), val->getObjectKind(), 1289 val->isTypeDependent(), val->isValueDependent(), 1290 val->containsUnexpandedParameterPack()), 1291 L(l), R(r), Val(val) {} 1292 1293 /// \brief Construct an empty parenthesized expression. 1294 explicit ParenExpr(EmptyShell Empty) 1295 : Expr(ParenExprClass, Empty) { } 1296 1297 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1298 Expr *getSubExpr() { return cast<Expr>(Val); } 1299 void setSubExpr(Expr *E) { Val = E; } 1300 1301 SourceRange getSourceRange() const { return SourceRange(L, R); } 1302 1303 /// \brief Get the location of the left parentheses '('. 1304 SourceLocation getLParen() const { return L; } 1305 void setLParen(SourceLocation Loc) { L = Loc; } 1306 1307 /// \brief Get the location of the right parentheses ')'. 1308 SourceLocation getRParen() const { return R; } 1309 void setRParen(SourceLocation Loc) { R = Loc; } 1310 1311 static bool classof(const Stmt *T) { 1312 return T->getStmtClass() == ParenExprClass; 1313 } 1314 static bool classof(const ParenExpr *) { return true; } 1315 1316 // Iterators 1317 child_range children() { return child_range(&Val, &Val+1); } 1318}; 1319 1320 1321/// UnaryOperator - This represents the unary-expression's (except sizeof and 1322/// alignof), the postinc/postdec operators from postfix-expression, and various 1323/// extensions. 1324/// 1325/// Notes on various nodes: 1326/// 1327/// Real/Imag - These return the real/imag part of a complex operand. If 1328/// applied to a non-complex value, the former returns its operand and the 1329/// later returns zero in the type of the operand. 1330/// 1331class UnaryOperator : public Expr { 1332public: 1333 typedef UnaryOperatorKind Opcode; 1334 1335private: 1336 unsigned Opc : 5; 1337 SourceLocation Loc; 1338 Stmt *Val; 1339public: 1340 1341 UnaryOperator(Expr *input, Opcode opc, QualType type, 1342 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1343 : Expr(UnaryOperatorClass, type, VK, OK, 1344 input->isTypeDependent() || type->isDependentType(), 1345 input->isValueDependent(), 1346 input->containsUnexpandedParameterPack()), 1347 Opc(opc), Loc(l), Val(input) {} 1348 1349 /// \brief Build an empty unary operator. 1350 explicit UnaryOperator(EmptyShell Empty) 1351 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1352 1353 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1354 void setOpcode(Opcode O) { Opc = O; } 1355 1356 Expr *getSubExpr() const { return cast<Expr>(Val); } 1357 void setSubExpr(Expr *E) { Val = E; } 1358 1359 /// getOperatorLoc - Return the location of the operator. 1360 SourceLocation getOperatorLoc() const { return Loc; } 1361 void setOperatorLoc(SourceLocation L) { Loc = L; } 1362 1363 /// isPostfix - Return true if this is a postfix operation, like x++. 1364 static bool isPostfix(Opcode Op) { 1365 return Op == UO_PostInc || Op == UO_PostDec; 1366 } 1367 1368 /// isPrefix - Return true if this is a prefix operation, like --x. 1369 static bool isPrefix(Opcode Op) { 1370 return Op == UO_PreInc || Op == UO_PreDec; 1371 } 1372 1373 bool isPrefix() const { return isPrefix(getOpcode()); } 1374 bool isPostfix() const { return isPostfix(getOpcode()); } 1375 bool isIncrementOp() const { 1376 return Opc == UO_PreInc || Opc == UO_PostInc; 1377 } 1378 bool isIncrementDecrementOp() const { 1379 return Opc <= UO_PreDec; 1380 } 1381 static bool isArithmeticOp(Opcode Op) { 1382 return Op >= UO_Plus && Op <= UO_LNot; 1383 } 1384 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1385 1386 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1387 /// corresponds to, e.g. "sizeof" or "[pre]++" 1388 static const char *getOpcodeStr(Opcode Op); 1389 1390 /// \brief Retrieve the unary opcode that corresponds to the given 1391 /// overloaded operator. 1392 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1393 1394 /// \brief Retrieve the overloaded operator kind that corresponds to 1395 /// the given unary opcode. 1396 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1397 1398 SourceRange getSourceRange() const { 1399 if (isPostfix()) 1400 return SourceRange(Val->getLocStart(), Loc); 1401 else 1402 return SourceRange(Loc, Val->getLocEnd()); 1403 } 1404 SourceLocation getExprLoc() const { return Loc; } 1405 1406 static bool classof(const Stmt *T) { 1407 return T->getStmtClass() == UnaryOperatorClass; 1408 } 1409 static bool classof(const UnaryOperator *) { return true; } 1410 1411 // Iterators 1412 child_range children() { return child_range(&Val, &Val+1); } 1413}; 1414 1415/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1416/// offsetof(record-type, member-designator). For example, given: 1417/// @code 1418/// struct S { 1419/// float f; 1420/// double d; 1421/// }; 1422/// struct T { 1423/// int i; 1424/// struct S s[10]; 1425/// }; 1426/// @endcode 1427/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1428 1429class OffsetOfExpr : public Expr { 1430public: 1431 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1432 class OffsetOfNode { 1433 public: 1434 /// \brief The kind of offsetof node we have. 1435 enum Kind { 1436 /// \brief An index into an array. 1437 Array = 0x00, 1438 /// \brief A field. 1439 Field = 0x01, 1440 /// \brief A field in a dependent type, known only by its name. 1441 Identifier = 0x02, 1442 /// \brief An implicit indirection through a C++ base class, when the 1443 /// field found is in a base class. 1444 Base = 0x03 1445 }; 1446 1447 private: 1448 enum { MaskBits = 2, Mask = 0x03 }; 1449 1450 /// \brief The source range that covers this part of the designator. 1451 SourceRange Range; 1452 1453 /// \brief The data describing the designator, which comes in three 1454 /// different forms, depending on the lower two bits. 1455 /// - An unsigned index into the array of Expr*'s stored after this node 1456 /// in memory, for [constant-expression] designators. 1457 /// - A FieldDecl*, for references to a known field. 1458 /// - An IdentifierInfo*, for references to a field with a given name 1459 /// when the class type is dependent. 1460 /// - A CXXBaseSpecifier*, for references that look at a field in a 1461 /// base class. 1462 uintptr_t Data; 1463 1464 public: 1465 /// \brief Create an offsetof node that refers to an array element. 1466 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1467 SourceLocation RBracketLoc) 1468 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1469 1470 /// \brief Create an offsetof node that refers to a field. 1471 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1472 SourceLocation NameLoc) 1473 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1474 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1475 1476 /// \brief Create an offsetof node that refers to an identifier. 1477 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1478 SourceLocation NameLoc) 1479 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1480 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1481 1482 /// \brief Create an offsetof node that refers into a C++ base class. 1483 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1484 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1485 1486 /// \brief Determine what kind of offsetof node this is. 1487 Kind getKind() const { 1488 return static_cast<Kind>(Data & Mask); 1489 } 1490 1491 /// \brief For an array element node, returns the index into the array 1492 /// of expressions. 1493 unsigned getArrayExprIndex() const { 1494 assert(getKind() == Array); 1495 return Data >> 2; 1496 } 1497 1498 /// \brief For a field offsetof node, returns the field. 1499 FieldDecl *getField() const { 1500 assert(getKind() == Field); 1501 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1502 } 1503 1504 /// \brief For a field or identifier offsetof node, returns the name of 1505 /// the field. 1506 IdentifierInfo *getFieldName() const; 1507 1508 /// \brief For a base class node, returns the base specifier. 1509 CXXBaseSpecifier *getBase() const { 1510 assert(getKind() == Base); 1511 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1512 } 1513 1514 /// \brief Retrieve the source range that covers this offsetof node. 1515 /// 1516 /// For an array element node, the source range contains the locations of 1517 /// the square brackets. For a field or identifier node, the source range 1518 /// contains the location of the period (if there is one) and the 1519 /// identifier. 1520 SourceRange getSourceRange() const { return Range; } 1521 }; 1522 1523private: 1524 1525 SourceLocation OperatorLoc, RParenLoc; 1526 // Base type; 1527 TypeSourceInfo *TSInfo; 1528 // Number of sub-components (i.e. instances of OffsetOfNode). 1529 unsigned NumComps; 1530 // Number of sub-expressions (i.e. array subscript expressions). 1531 unsigned NumExprs; 1532 1533 OffsetOfExpr(ASTContext &C, QualType type, 1534 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1535 OffsetOfNode* compsPtr, unsigned numComps, 1536 Expr** exprsPtr, unsigned numExprs, 1537 SourceLocation RParenLoc); 1538 1539 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1540 : Expr(OffsetOfExprClass, EmptyShell()), 1541 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1542 1543public: 1544 1545 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1546 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1547 OffsetOfNode* compsPtr, unsigned numComps, 1548 Expr** exprsPtr, unsigned numExprs, 1549 SourceLocation RParenLoc); 1550 1551 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1552 unsigned NumComps, unsigned NumExprs); 1553 1554 /// getOperatorLoc - Return the location of the operator. 1555 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1556 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1557 1558 /// \brief Return the location of the right parentheses. 1559 SourceLocation getRParenLoc() const { return RParenLoc; } 1560 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1561 1562 TypeSourceInfo *getTypeSourceInfo() const { 1563 return TSInfo; 1564 } 1565 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1566 TSInfo = tsi; 1567 } 1568 1569 const OffsetOfNode &getComponent(unsigned Idx) const { 1570 assert(Idx < NumComps && "Subscript out of range"); 1571 return reinterpret_cast<const OffsetOfNode *> (this + 1)[Idx]; 1572 } 1573 1574 void setComponent(unsigned Idx, OffsetOfNode ON) { 1575 assert(Idx < NumComps && "Subscript out of range"); 1576 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1577 } 1578 1579 unsigned getNumComponents() const { 1580 return NumComps; 1581 } 1582 1583 Expr* getIndexExpr(unsigned Idx) { 1584 assert(Idx < NumExprs && "Subscript out of range"); 1585 return reinterpret_cast<Expr **>( 1586 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1587 } 1588 const Expr *getIndexExpr(unsigned Idx) const { 1589 return const_cast<OffsetOfExpr*>(this)->getIndexExpr(Idx); 1590 } 1591 1592 void setIndexExpr(unsigned Idx, Expr* E) { 1593 assert(Idx < NumComps && "Subscript out of range"); 1594 reinterpret_cast<Expr **>( 1595 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1596 } 1597 1598 unsigned getNumExpressions() const { 1599 return NumExprs; 1600 } 1601 1602 SourceRange getSourceRange() const { 1603 return SourceRange(OperatorLoc, RParenLoc); 1604 } 1605 1606 static bool classof(const Stmt *T) { 1607 return T->getStmtClass() == OffsetOfExprClass; 1608 } 1609 1610 static bool classof(const OffsetOfExpr *) { return true; } 1611 1612 // Iterators 1613 child_range children() { 1614 Stmt **begin = 1615 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1616 + NumComps); 1617 return child_range(begin, begin + NumExprs); 1618 } 1619}; 1620 1621/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1622/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1623/// vec_step (OpenCL 1.1 6.11.12). 1624class UnaryExprOrTypeTraitExpr : public Expr { 1625 unsigned Kind : 2; 1626 bool isType : 1; // true if operand is a type, false if an expression 1627 union { 1628 TypeSourceInfo *Ty; 1629 Stmt *Ex; 1630 } Argument; 1631 SourceLocation OpLoc, RParenLoc; 1632 1633public: 1634 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1635 QualType resultType, SourceLocation op, 1636 SourceLocation rp) : 1637 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1638 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1639 // Value-dependent if the argument is type-dependent. 1640 TInfo->getType()->isDependentType(), 1641 TInfo->getType()->containsUnexpandedParameterPack()), 1642 Kind(ExprKind), isType(true), OpLoc(op), RParenLoc(rp) { 1643 Argument.Ty = TInfo; 1644 } 1645 1646 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1647 QualType resultType, SourceLocation op, 1648 SourceLocation rp) : 1649 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1650 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1651 // Value-dependent if the argument is type-dependent. 1652 E->isTypeDependent(), 1653 E->containsUnexpandedParameterPack()), 1654 Kind(ExprKind), isType(false), OpLoc(op), RParenLoc(rp) { 1655 Argument.Ex = E; 1656 } 1657 1658 /// \brief Construct an empty sizeof/alignof expression. 1659 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1660 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1661 1662 UnaryExprOrTypeTrait getKind() const { 1663 return static_cast<UnaryExprOrTypeTrait>(Kind); 1664 } 1665 void setKind(UnaryExprOrTypeTrait K) { Kind = K; } 1666 1667 bool isArgumentType() const { return isType; } 1668 QualType getArgumentType() const { 1669 return getArgumentTypeInfo()->getType(); 1670 } 1671 TypeSourceInfo *getArgumentTypeInfo() const { 1672 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1673 return Argument.Ty; 1674 } 1675 Expr *getArgumentExpr() { 1676 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1677 return static_cast<Expr*>(Argument.Ex); 1678 } 1679 const Expr *getArgumentExpr() const { 1680 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1681 } 1682 1683 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1684 void setArgument(TypeSourceInfo *TInfo) { 1685 Argument.Ty = TInfo; 1686 isType = true; 1687 } 1688 1689 /// Gets the argument type, or the type of the argument expression, whichever 1690 /// is appropriate. 1691 QualType getTypeOfArgument() const { 1692 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1693 } 1694 1695 SourceLocation getOperatorLoc() const { return OpLoc; } 1696 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1697 1698 SourceLocation getRParenLoc() const { return RParenLoc; } 1699 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1700 1701 SourceRange getSourceRange() const { 1702 return SourceRange(OpLoc, RParenLoc); 1703 } 1704 1705 static bool classof(const Stmt *T) { 1706 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1707 } 1708 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1709 1710 // Iterators 1711 child_range children(); 1712}; 1713 1714//===----------------------------------------------------------------------===// 1715// Postfix Operators. 1716//===----------------------------------------------------------------------===// 1717 1718/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1719class ArraySubscriptExpr : public Expr { 1720 enum { LHS, RHS, END_EXPR=2 }; 1721 Stmt* SubExprs[END_EXPR]; 1722 SourceLocation RBracketLoc; 1723public: 1724 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1725 ExprValueKind VK, ExprObjectKind OK, 1726 SourceLocation rbracketloc) 1727 : Expr(ArraySubscriptExprClass, t, VK, OK, 1728 lhs->isTypeDependent() || rhs->isTypeDependent(), 1729 lhs->isValueDependent() || rhs->isValueDependent(), 1730 (lhs->containsUnexpandedParameterPack() || 1731 rhs->containsUnexpandedParameterPack())), 1732 RBracketLoc(rbracketloc) { 1733 SubExprs[LHS] = lhs; 1734 SubExprs[RHS] = rhs; 1735 } 1736 1737 /// \brief Create an empty array subscript expression. 1738 explicit ArraySubscriptExpr(EmptyShell Shell) 1739 : Expr(ArraySubscriptExprClass, Shell) { } 1740 1741 /// An array access can be written A[4] or 4[A] (both are equivalent). 1742 /// - getBase() and getIdx() always present the normalized view: A[4]. 1743 /// In this case getBase() returns "A" and getIdx() returns "4". 1744 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1745 /// 4[A] getLHS() returns "4". 1746 /// Note: Because vector element access is also written A[4] we must 1747 /// predicate the format conversion in getBase and getIdx only on the 1748 /// the type of the RHS, as it is possible for the LHS to be a vector of 1749 /// integer type 1750 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1751 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1752 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1753 1754 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1755 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1756 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1757 1758 Expr *getBase() { 1759 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1760 } 1761 1762 const Expr *getBase() const { 1763 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1764 } 1765 1766 Expr *getIdx() { 1767 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1768 } 1769 1770 const Expr *getIdx() const { 1771 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1772 } 1773 1774 SourceRange getSourceRange() const { 1775 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1776 } 1777 1778 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1779 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1780 1781 SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1782 1783 static bool classof(const Stmt *T) { 1784 return T->getStmtClass() == ArraySubscriptExprClass; 1785 } 1786 static bool classof(const ArraySubscriptExpr *) { return true; } 1787 1788 // Iterators 1789 child_range children() { 1790 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 1791 } 1792}; 1793 1794 1795/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1796/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1797/// while its subclasses may represent alternative syntax that (semantically) 1798/// results in a function call. For example, CXXOperatorCallExpr is 1799/// a subclass for overloaded operator calls that use operator syntax, e.g., 1800/// "str1 + str2" to resolve to a function call. 1801class CallExpr : public Expr { 1802 enum { FN=0, PREARGS_START=1 }; 1803 Stmt **SubExprs; 1804 unsigned NumArgs; 1805 SourceLocation RParenLoc; 1806 1807protected: 1808 // These versions of the constructor are for derived classes. 1809 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 1810 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 1811 SourceLocation rparenloc); 1812 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 1813 1814 Stmt *getPreArg(unsigned i) { 1815 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1816 return SubExprs[PREARGS_START+i]; 1817 } 1818 const Stmt *getPreArg(unsigned i) const { 1819 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1820 return SubExprs[PREARGS_START+i]; 1821 } 1822 void setPreArg(unsigned i, Stmt *PreArg) { 1823 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1824 SubExprs[PREARGS_START+i] = PreArg; 1825 } 1826 1827 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 1828 1829public: 1830 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1831 ExprValueKind VK, SourceLocation rparenloc); 1832 1833 /// \brief Build an empty call expression. 1834 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1835 1836 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1837 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1838 void setCallee(Expr *F) { SubExprs[FN] = F; } 1839 1840 Decl *getCalleeDecl(); 1841 const Decl *getCalleeDecl() const { 1842 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1843 } 1844 1845 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1846 FunctionDecl *getDirectCallee(); 1847 const FunctionDecl *getDirectCallee() const { 1848 return const_cast<CallExpr*>(this)->getDirectCallee(); 1849 } 1850 1851 /// getNumArgs - Return the number of actual arguments to this call. 1852 /// 1853 unsigned getNumArgs() const { return NumArgs; } 1854 1855 /// \brief Retrieve the call arguments. 1856 Expr **getArgs() { 1857 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 1858 } 1859 1860 /// getArg - Return the specified argument. 1861 Expr *getArg(unsigned Arg) { 1862 assert(Arg < NumArgs && "Arg access out of range!"); 1863 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1864 } 1865 const Expr *getArg(unsigned Arg) const { 1866 assert(Arg < NumArgs && "Arg access out of range!"); 1867 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1868 } 1869 1870 /// setArg - Set the specified argument. 1871 void setArg(unsigned Arg, Expr *ArgExpr) { 1872 assert(Arg < NumArgs && "Arg access out of range!"); 1873 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 1874 } 1875 1876 /// setNumArgs - This changes the number of arguments present in this call. 1877 /// Any orphaned expressions are deleted by this, and any new operands are set 1878 /// to null. 1879 void setNumArgs(ASTContext& C, unsigned NumArgs); 1880 1881 typedef ExprIterator arg_iterator; 1882 typedef ConstExprIterator const_arg_iterator; 1883 1884 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 1885 arg_iterator arg_end() { 1886 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1887 } 1888 const_arg_iterator arg_begin() const { 1889 return SubExprs+PREARGS_START+getNumPreArgs(); 1890 } 1891 const_arg_iterator arg_end() const { 1892 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1893 } 1894 1895 /// getNumCommas - Return the number of commas that must have been present in 1896 /// this function call. 1897 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1898 1899 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1900 /// not, return 0. 1901 unsigned isBuiltinCall(const ASTContext &Context) const; 1902 1903 /// getCallReturnType - Get the return type of the call expr. This is not 1904 /// always the type of the expr itself, if the return type is a reference 1905 /// type. 1906 QualType getCallReturnType() const; 1907 1908 SourceLocation getRParenLoc() const { return RParenLoc; } 1909 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1910 1911 SourceRange getSourceRange() const; 1912 1913 static bool classof(const Stmt *T) { 1914 return T->getStmtClass() >= firstCallExprConstant && 1915 T->getStmtClass() <= lastCallExprConstant; 1916 } 1917 static bool classof(const CallExpr *) { return true; } 1918 1919 // Iterators 1920 child_range children() { 1921 return child_range(&SubExprs[0], 1922 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 1923 } 1924}; 1925 1926/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1927/// 1928class MemberExpr : public Expr { 1929 /// Extra data stored in some member expressions. 1930 struct MemberNameQualifier { 1931 /// \brief The nested-name-specifier that qualifies the name, including 1932 /// source-location information. 1933 NestedNameSpecifierLoc QualifierLoc; 1934 1935 /// \brief The DeclAccessPair through which the MemberDecl was found due to 1936 /// name qualifiers. 1937 DeclAccessPair FoundDecl; 1938 }; 1939 1940 /// Base - the expression for the base pointer or structure references. In 1941 /// X.F, this is "X". 1942 Stmt *Base; 1943 1944 /// MemberDecl - This is the decl being referenced by the field/member name. 1945 /// In X.F, this is the decl referenced by F. 1946 ValueDecl *MemberDecl; 1947 1948 /// MemberLoc - This is the location of the member name. 1949 SourceLocation MemberLoc; 1950 1951 /// MemberDNLoc - Provides source/type location info for the 1952 /// declaration name embedded in MemberDecl. 1953 DeclarationNameLoc MemberDNLoc; 1954 1955 /// IsArrow - True if this is "X->F", false if this is "X.F". 1956 bool IsArrow : 1; 1957 1958 /// \brief True if this member expression used a nested-name-specifier to 1959 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1960 /// declaration. When true, a MemberNameQualifier 1961 /// structure is allocated immediately after the MemberExpr. 1962 bool HasQualifierOrFoundDecl : 1; 1963 1964 /// \brief True if this member expression specified a template argument list 1965 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1966 /// structure (and its TemplateArguments) are allocated immediately after 1967 /// the MemberExpr or, if the member expression also has a qualifier, after 1968 /// the MemberNameQualifier structure. 1969 bool HasExplicitTemplateArgumentList : 1; 1970 1971 /// \brief Retrieve the qualifier that preceded the member name, if any. 1972 MemberNameQualifier *getMemberQualifier() { 1973 assert(HasQualifierOrFoundDecl); 1974 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1975 } 1976 1977 /// \brief Retrieve the qualifier that preceded the member name, if any. 1978 const MemberNameQualifier *getMemberQualifier() const { 1979 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1980 } 1981 1982public: 1983 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1984 const DeclarationNameInfo &NameInfo, QualType ty, 1985 ExprValueKind VK, ExprObjectKind OK) 1986 : Expr(MemberExprClass, ty, VK, OK, 1987 base->isTypeDependent(), base->isValueDependent(), 1988 base->containsUnexpandedParameterPack()), 1989 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 1990 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 1991 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) { 1992 assert(memberdecl->getDeclName() == NameInfo.getName()); 1993 } 1994 1995 // NOTE: this constructor should be used only when it is known that 1996 // the member name can not provide additional syntactic info 1997 // (i.e., source locations for C++ operator names or type source info 1998 // for constructors, destructors and conversion oeprators). 1999 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 2000 SourceLocation l, QualType ty, 2001 ExprValueKind VK, ExprObjectKind OK) 2002 : Expr(MemberExprClass, ty, VK, OK, 2003 base->isTypeDependent(), base->isValueDependent(), 2004 base->containsUnexpandedParameterPack()), 2005 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 2006 IsArrow(isarrow), 2007 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 2008 2009 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 2010 NestedNameSpecifierLoc QualifierLoc, 2011 ValueDecl *memberdecl, DeclAccessPair founddecl, 2012 DeclarationNameInfo MemberNameInfo, 2013 const TemplateArgumentListInfo *targs, 2014 QualType ty, ExprValueKind VK, ExprObjectKind OK); 2015 2016 void setBase(Expr *E) { Base = E; } 2017 Expr *getBase() const { return cast<Expr>(Base); } 2018 2019 /// \brief Retrieve the member declaration to which this expression refers. 2020 /// 2021 /// The returned declaration will either be a FieldDecl or (in C++) 2022 /// a CXXMethodDecl. 2023 ValueDecl *getMemberDecl() const { return MemberDecl; } 2024 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 2025 2026 /// \brief Retrieves the declaration found by lookup. 2027 DeclAccessPair getFoundDecl() const { 2028 if (!HasQualifierOrFoundDecl) 2029 return DeclAccessPair::make(getMemberDecl(), 2030 getMemberDecl()->getAccess()); 2031 return getMemberQualifier()->FoundDecl; 2032 } 2033 2034 /// \brief Determines whether this member expression actually had 2035 /// a C++ nested-name-specifier prior to the name of the member, e.g., 2036 /// x->Base::foo. 2037 bool hasQualifier() const { return getQualifier() != 0; } 2038 2039 /// \brief If the member name was qualified, retrieves the 2040 /// nested-name-specifier that precedes the member name. Otherwise, returns 2041 /// NULL. 2042 NestedNameSpecifier *getQualifier() const { 2043 if (!HasQualifierOrFoundDecl) 2044 return 0; 2045 2046 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 2047 } 2048 2049 /// \brief If the member name was qualified, retrieves the 2050 /// nested-name-specifier that precedes the member name, with source-location 2051 /// information. 2052 NestedNameSpecifierLoc getQualifierLoc() const { 2053 if (!hasQualifier()) 2054 return NestedNameSpecifierLoc(); 2055 2056 return getMemberQualifier()->QualifierLoc; 2057 } 2058 2059 /// \brief Determines whether this member expression actually had a C++ 2060 /// template argument list explicitly specified, e.g., x.f<int>. 2061 bool hasExplicitTemplateArgs() const { 2062 return HasExplicitTemplateArgumentList; 2063 } 2064 2065 /// \brief Copies the template arguments (if present) into the given 2066 /// structure. 2067 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2068 if (hasExplicitTemplateArgs()) 2069 getExplicitTemplateArgs().copyInto(List); 2070 } 2071 2072 /// \brief Retrieve the explicit template argument list that 2073 /// follow the member template name. This must only be called on an 2074 /// expression with explicit template arguments. 2075 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 2076 assert(HasExplicitTemplateArgumentList); 2077 if (!HasQualifierOrFoundDecl) 2078 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 2079 2080 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 2081 getMemberQualifier() + 1); 2082 } 2083 2084 /// \brief Retrieve the explicit template argument list that 2085 /// followed the member template name. This must only be called on 2086 /// an expression with explicit template arguments. 2087 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 2088 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2089 } 2090 2091 /// \brief Retrieves the optional explicit template arguments. 2092 /// This points to the same data as getExplicitTemplateArgs(), but 2093 /// returns null if there are no explicit template arguments. 2094 const ExplicitTemplateArgumentList *getOptionalExplicitTemplateArgs() const { 2095 if (!hasExplicitTemplateArgs()) return 0; 2096 return &getExplicitTemplateArgs(); 2097 } 2098 2099 /// \brief Retrieve the location of the left angle bracket following the 2100 /// member name ('<'), if any. 2101 SourceLocation getLAngleLoc() const { 2102 if (!HasExplicitTemplateArgumentList) 2103 return SourceLocation(); 2104 2105 return getExplicitTemplateArgs().LAngleLoc; 2106 } 2107 2108 /// \brief Retrieve the template arguments provided as part of this 2109 /// template-id. 2110 const TemplateArgumentLoc *getTemplateArgs() const { 2111 if (!HasExplicitTemplateArgumentList) 2112 return 0; 2113 2114 return getExplicitTemplateArgs().getTemplateArgs(); 2115 } 2116 2117 /// \brief Retrieve the number of template arguments provided as part of this 2118 /// template-id. 2119 unsigned getNumTemplateArgs() const { 2120 if (!HasExplicitTemplateArgumentList) 2121 return 0; 2122 2123 return getExplicitTemplateArgs().NumTemplateArgs; 2124 } 2125 2126 /// \brief Retrieve the location of the right angle bracket following the 2127 /// template arguments ('>'). 2128 SourceLocation getRAngleLoc() const { 2129 if (!HasExplicitTemplateArgumentList) 2130 return SourceLocation(); 2131 2132 return getExplicitTemplateArgs().RAngleLoc; 2133 } 2134 2135 /// \brief Retrieve the member declaration name info. 2136 DeclarationNameInfo getMemberNameInfo() const { 2137 return DeclarationNameInfo(MemberDecl->getDeclName(), 2138 MemberLoc, MemberDNLoc); 2139 } 2140 2141 bool isArrow() const { return IsArrow; } 2142 void setArrow(bool A) { IsArrow = A; } 2143 2144 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2145 /// location of 'F'. 2146 SourceLocation getMemberLoc() const { return MemberLoc; } 2147 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2148 2149 SourceRange getSourceRange() const; 2150 2151 SourceLocation getExprLoc() const { return MemberLoc; } 2152 2153 /// \brief Determine whether the base of this explicit is implicit. 2154 bool isImplicitAccess() const { 2155 return getBase() && getBase()->isImplicitCXXThis(); 2156 } 2157 2158 static bool classof(const Stmt *T) { 2159 return T->getStmtClass() == MemberExprClass; 2160 } 2161 static bool classof(const MemberExpr *) { return true; } 2162 2163 // Iterators 2164 child_range children() { return child_range(&Base, &Base+1); } 2165 2166 friend class ASTReader; 2167 friend class ASTStmtWriter; 2168}; 2169 2170/// CompoundLiteralExpr - [C99 6.5.2.5] 2171/// 2172class CompoundLiteralExpr : public Expr { 2173 /// LParenLoc - If non-null, this is the location of the left paren in a 2174 /// compound literal like "(int){4}". This can be null if this is a 2175 /// synthesized compound expression. 2176 SourceLocation LParenLoc; 2177 2178 /// The type as written. This can be an incomplete array type, in 2179 /// which case the actual expression type will be different. 2180 TypeSourceInfo *TInfo; 2181 Stmt *Init; 2182 bool FileScope; 2183public: 2184 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2185 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2186 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2187 tinfo->getType()->isDependentType(), 2188 init->isValueDependent(), 2189 init->containsUnexpandedParameterPack()), 2190 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2191 2192 /// \brief Construct an empty compound literal. 2193 explicit CompoundLiteralExpr(EmptyShell Empty) 2194 : Expr(CompoundLiteralExprClass, Empty) { } 2195 2196 const Expr *getInitializer() const { return cast<Expr>(Init); } 2197 Expr *getInitializer() { return cast<Expr>(Init); } 2198 void setInitializer(Expr *E) { Init = E; } 2199 2200 bool isFileScope() const { return FileScope; } 2201 void setFileScope(bool FS) { FileScope = FS; } 2202 2203 SourceLocation getLParenLoc() const { return LParenLoc; } 2204 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2205 2206 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2207 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2208 2209 SourceRange getSourceRange() const { 2210 // FIXME: Init should never be null. 2211 if (!Init) 2212 return SourceRange(); 2213 if (LParenLoc.isInvalid()) 2214 return Init->getSourceRange(); 2215 return SourceRange(LParenLoc, Init->getLocEnd()); 2216 } 2217 2218 static bool classof(const Stmt *T) { 2219 return T->getStmtClass() == CompoundLiteralExprClass; 2220 } 2221 static bool classof(const CompoundLiteralExpr *) { return true; } 2222 2223 // Iterators 2224 child_range children() { return child_range(&Init, &Init+1); } 2225}; 2226 2227/// CastExpr - Base class for type casts, including both implicit 2228/// casts (ImplicitCastExpr) and explicit casts that have some 2229/// representation in the source code (ExplicitCastExpr's derived 2230/// classes). 2231class CastExpr : public Expr { 2232public: 2233 typedef clang::CastKind CastKind; 2234 2235private: 2236 Stmt *Op; 2237 2238 void CheckCastConsistency() const { 2239#ifndef NDEBUG 2240 switch (getCastKind()) { 2241 case CK_DerivedToBase: 2242 case CK_UncheckedDerivedToBase: 2243 case CK_DerivedToBaseMemberPointer: 2244 case CK_BaseToDerived: 2245 case CK_BaseToDerivedMemberPointer: 2246 assert(!path_empty() && "Cast kind should have a base path!"); 2247 break; 2248 2249 // These should not have an inheritance path. 2250 case CK_BitCast: 2251 case CK_Dynamic: 2252 case CK_ToUnion: 2253 case CK_ArrayToPointerDecay: 2254 case CK_FunctionToPointerDecay: 2255 case CK_NullToMemberPointer: 2256 case CK_NullToPointer: 2257 case CK_ConstructorConversion: 2258 case CK_IntegralToPointer: 2259 case CK_PointerToIntegral: 2260 case CK_ToVoid: 2261 case CK_VectorSplat: 2262 case CK_IntegralCast: 2263 case CK_IntegralToFloating: 2264 case CK_FloatingToIntegral: 2265 case CK_FloatingCast: 2266 case CK_AnyPointerToObjCPointerCast: 2267 case CK_AnyPointerToBlockPointerCast: 2268 case CK_ObjCObjectLValueCast: 2269 case CK_FloatingRealToComplex: 2270 case CK_FloatingComplexToReal: 2271 case CK_FloatingComplexCast: 2272 case CK_FloatingComplexToIntegralComplex: 2273 case CK_IntegralRealToComplex: 2274 case CK_IntegralComplexToReal: 2275 case CK_IntegralComplexCast: 2276 case CK_IntegralComplexToFloatingComplex: 2277 case CK_ObjCProduceObject: 2278 case CK_ObjCConsumeObject: 2279 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 2280 // fallthrough to check for null base path 2281 2282 case CK_Dependent: 2283 case CK_LValueToRValue: 2284 case CK_GetObjCProperty: 2285 case CK_NoOp: 2286 case CK_PointerToBoolean: 2287 case CK_IntegralToBoolean: 2288 case CK_FloatingToBoolean: 2289 case CK_MemberPointerToBoolean: 2290 case CK_FloatingComplexToBoolean: 2291 case CK_IntegralComplexToBoolean: 2292 case CK_LValueBitCast: // -> bool& 2293 case CK_UserDefinedConversion: // operator bool() 2294 assert(path_empty() && "Cast kind should not have a base path!"); 2295 break; 2296 } 2297#endif 2298 } 2299 2300 const CXXBaseSpecifier * const *path_buffer() const { 2301 return const_cast<CastExpr*>(this)->path_buffer(); 2302 } 2303 CXXBaseSpecifier **path_buffer(); 2304 2305 void setBasePathSize(unsigned basePathSize) { 2306 CastExprBits.BasePathSize = basePathSize; 2307 assert(CastExprBits.BasePathSize == basePathSize && 2308 "basePathSize doesn't fit in bits of CastExprBits.BasePathSize!"); 2309 } 2310 2311protected: 2312 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2313 const CastKind kind, Expr *op, unsigned BasePathSize) : 2314 Expr(SC, ty, VK, OK_Ordinary, 2315 // Cast expressions are type-dependent if the type is 2316 // dependent (C++ [temp.dep.expr]p3). 2317 ty->isDependentType(), 2318 // Cast expressions are value-dependent if the type is 2319 // dependent or if the subexpression is value-dependent. 2320 ty->isDependentType() || (op && op->isValueDependent()), 2321 (ty->containsUnexpandedParameterPack() || 2322 op->containsUnexpandedParameterPack())), 2323 Op(op) { 2324 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2325 CastExprBits.Kind = kind; 2326 setBasePathSize(BasePathSize); 2327 CheckCastConsistency(); 2328 } 2329 2330 /// \brief Construct an empty cast. 2331 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2332 : Expr(SC, Empty) { 2333 setBasePathSize(BasePathSize); 2334 } 2335 2336public: 2337 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2338 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2339 const char *getCastKindName() const; 2340 2341 Expr *getSubExpr() { return cast<Expr>(Op); } 2342 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2343 void setSubExpr(Expr *E) { Op = E; } 2344 2345 /// \brief Retrieve the cast subexpression as it was written in the source 2346 /// code, looking through any implicit casts or other intermediate nodes 2347 /// introduced by semantic analysis. 2348 Expr *getSubExprAsWritten(); 2349 const Expr *getSubExprAsWritten() const { 2350 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2351 } 2352 2353 typedef CXXBaseSpecifier **path_iterator; 2354 typedef const CXXBaseSpecifier * const *path_const_iterator; 2355 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2356 unsigned path_size() const { return CastExprBits.BasePathSize; } 2357 path_iterator path_begin() { return path_buffer(); } 2358 path_iterator path_end() { return path_buffer() + path_size(); } 2359 path_const_iterator path_begin() const { return path_buffer(); } 2360 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2361 2362 void setCastPath(const CXXCastPath &Path); 2363 2364 static bool classof(const Stmt *T) { 2365 return T->getStmtClass() >= firstCastExprConstant && 2366 T->getStmtClass() <= lastCastExprConstant; 2367 } 2368 static bool classof(const CastExpr *) { return true; } 2369 2370 // Iterators 2371 child_range children() { return child_range(&Op, &Op+1); } 2372}; 2373 2374/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2375/// conversions, which have no direct representation in the original 2376/// source code. For example: converting T[]->T*, void f()->void 2377/// (*f)(), float->double, short->int, etc. 2378/// 2379/// In C, implicit casts always produce rvalues. However, in C++, an 2380/// implicit cast whose result is being bound to a reference will be 2381/// an lvalue or xvalue. For example: 2382/// 2383/// @code 2384/// class Base { }; 2385/// class Derived : public Base { }; 2386/// Derived &&ref(); 2387/// void f(Derived d) { 2388/// Base& b = d; // initializer is an ImplicitCastExpr 2389/// // to an lvalue of type Base 2390/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2391/// // to an xvalue of type Base 2392/// } 2393/// @endcode 2394class ImplicitCastExpr : public CastExpr { 2395private: 2396 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2397 unsigned BasePathLength, ExprValueKind VK) 2398 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2399 } 2400 2401 /// \brief Construct an empty implicit cast. 2402 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2403 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2404 2405public: 2406 enum OnStack_t { OnStack }; 2407 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2408 ExprValueKind VK) 2409 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2410 } 2411 2412 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2413 CastKind Kind, Expr *Operand, 2414 const CXXCastPath *BasePath, 2415 ExprValueKind Cat); 2416 2417 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2418 2419 SourceRange getSourceRange() const { 2420 return getSubExpr()->getSourceRange(); 2421 } 2422 2423 static bool classof(const Stmt *T) { 2424 return T->getStmtClass() == ImplicitCastExprClass; 2425 } 2426 static bool classof(const ImplicitCastExpr *) { return true; } 2427}; 2428 2429/// ExplicitCastExpr - An explicit cast written in the source 2430/// code. 2431/// 2432/// This class is effectively an abstract class, because it provides 2433/// the basic representation of an explicitly-written cast without 2434/// specifying which kind of cast (C cast, functional cast, static 2435/// cast, etc.) was written; specific derived classes represent the 2436/// particular style of cast and its location information. 2437/// 2438/// Unlike implicit casts, explicit cast nodes have two different 2439/// types: the type that was written into the source code, and the 2440/// actual type of the expression as determined by semantic 2441/// analysis. These types may differ slightly. For example, in C++ one 2442/// can cast to a reference type, which indicates that the resulting 2443/// expression will be an lvalue or xvalue. The reference type, however, 2444/// will not be used as the type of the expression. 2445class ExplicitCastExpr : public CastExpr { 2446 /// TInfo - Source type info for the (written) type 2447 /// this expression is casting to. 2448 TypeSourceInfo *TInfo; 2449 2450protected: 2451 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2452 CastKind kind, Expr *op, unsigned PathSize, 2453 TypeSourceInfo *writtenTy) 2454 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2455 2456 /// \brief Construct an empty explicit cast. 2457 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2458 : CastExpr(SC, Shell, PathSize) { } 2459 2460public: 2461 /// getTypeInfoAsWritten - Returns the type source info for the type 2462 /// that this expression is casting to. 2463 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2464 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2465 2466 /// getTypeAsWritten - Returns the type that this expression is 2467 /// casting to, as written in the source code. 2468 QualType getTypeAsWritten() const { return TInfo->getType(); } 2469 2470 static bool classof(const Stmt *T) { 2471 return T->getStmtClass() >= firstExplicitCastExprConstant && 2472 T->getStmtClass() <= lastExplicitCastExprConstant; 2473 } 2474 static bool classof(const ExplicitCastExpr *) { return true; } 2475}; 2476 2477/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2478/// cast in C++ (C++ [expr.cast]), which uses the syntax 2479/// (Type)expr. For example: @c (int)f. 2480class CStyleCastExpr : public ExplicitCastExpr { 2481 SourceLocation LPLoc; // the location of the left paren 2482 SourceLocation RPLoc; // the location of the right paren 2483 2484 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2485 unsigned PathSize, TypeSourceInfo *writtenTy, 2486 SourceLocation l, SourceLocation r) 2487 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2488 writtenTy), LPLoc(l), RPLoc(r) {} 2489 2490 /// \brief Construct an empty C-style explicit cast. 2491 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2492 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2493 2494public: 2495 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2496 ExprValueKind VK, CastKind K, 2497 Expr *Op, const CXXCastPath *BasePath, 2498 TypeSourceInfo *WrittenTy, SourceLocation L, 2499 SourceLocation R); 2500 2501 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2502 2503 SourceLocation getLParenLoc() const { return LPLoc; } 2504 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2505 2506 SourceLocation getRParenLoc() const { return RPLoc; } 2507 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2508 2509 SourceRange getSourceRange() const { 2510 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2511 } 2512 static bool classof(const Stmt *T) { 2513 return T->getStmtClass() == CStyleCastExprClass; 2514 } 2515 static bool classof(const CStyleCastExpr *) { return true; } 2516}; 2517 2518/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2519/// 2520/// This expression node kind describes a builtin binary operation, 2521/// such as "x + y" for integer values "x" and "y". The operands will 2522/// already have been converted to appropriate types (e.g., by 2523/// performing promotions or conversions). 2524/// 2525/// In C++, where operators may be overloaded, a different kind of 2526/// expression node (CXXOperatorCallExpr) is used to express the 2527/// invocation of an overloaded operator with operator syntax. Within 2528/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2529/// used to store an expression "x + y" depends on the subexpressions 2530/// for x and y. If neither x or y is type-dependent, and the "+" 2531/// operator resolves to a built-in operation, BinaryOperator will be 2532/// used to express the computation (x and y may still be 2533/// value-dependent). If either x or y is type-dependent, or if the 2534/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2535/// be used to express the computation. 2536class BinaryOperator : public Expr { 2537public: 2538 typedef BinaryOperatorKind Opcode; 2539 2540private: 2541 unsigned Opc : 6; 2542 SourceLocation OpLoc; 2543 2544 enum { LHS, RHS, END_EXPR }; 2545 Stmt* SubExprs[END_EXPR]; 2546public: 2547 2548 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2549 ExprValueKind VK, ExprObjectKind OK, 2550 SourceLocation opLoc) 2551 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2552 lhs->isTypeDependent() || rhs->isTypeDependent(), 2553 lhs->isValueDependent() || rhs->isValueDependent(), 2554 (lhs->containsUnexpandedParameterPack() || 2555 rhs->containsUnexpandedParameterPack())), 2556 Opc(opc), OpLoc(opLoc) { 2557 SubExprs[LHS] = lhs; 2558 SubExprs[RHS] = rhs; 2559 assert(!isCompoundAssignmentOp() && 2560 "Use ArithAssignBinaryOperator for compound assignments"); 2561 } 2562 2563 /// \brief Construct an empty binary operator. 2564 explicit BinaryOperator(EmptyShell Empty) 2565 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2566 2567 SourceLocation getOperatorLoc() const { return OpLoc; } 2568 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2569 2570 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2571 void setOpcode(Opcode O) { Opc = O; } 2572 2573 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2574 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2575 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2576 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2577 2578 SourceRange getSourceRange() const { 2579 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2580 } 2581 2582 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2583 /// corresponds to, e.g. "<<=". 2584 static const char *getOpcodeStr(Opcode Op); 2585 2586 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2587 2588 /// \brief Retrieve the binary opcode that corresponds to the given 2589 /// overloaded operator. 2590 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2591 2592 /// \brief Retrieve the overloaded operator kind that corresponds to 2593 /// the given binary opcode. 2594 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2595 2596 /// predicates to categorize the respective opcodes. 2597 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2598 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2599 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2600 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2601 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2602 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2603 2604 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2605 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2606 2607 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2608 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2609 2610 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2611 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2612 2613 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2614 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2615 2616 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2617 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2618 2619 static bool isAssignmentOp(Opcode Opc) { 2620 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2621 } 2622 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2623 2624 static bool isCompoundAssignmentOp(Opcode Opc) { 2625 return Opc > BO_Assign && Opc <= BO_OrAssign; 2626 } 2627 bool isCompoundAssignmentOp() const { 2628 return isCompoundAssignmentOp(getOpcode()); 2629 } 2630 2631 static bool isShiftAssignOp(Opcode Opc) { 2632 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2633 } 2634 bool isShiftAssignOp() const { 2635 return isShiftAssignOp(getOpcode()); 2636 } 2637 2638 static bool classof(const Stmt *S) { 2639 return S->getStmtClass() >= firstBinaryOperatorConstant && 2640 S->getStmtClass() <= lastBinaryOperatorConstant; 2641 } 2642 static bool classof(const BinaryOperator *) { return true; } 2643 2644 // Iterators 2645 child_range children() { 2646 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2647 } 2648 2649protected: 2650 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2651 ExprValueKind VK, ExprObjectKind OK, 2652 SourceLocation opLoc, bool dead) 2653 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2654 lhs->isTypeDependent() || rhs->isTypeDependent(), 2655 lhs->isValueDependent() || rhs->isValueDependent(), 2656 (lhs->containsUnexpandedParameterPack() || 2657 rhs->containsUnexpandedParameterPack())), 2658 Opc(opc), OpLoc(opLoc) { 2659 SubExprs[LHS] = lhs; 2660 SubExprs[RHS] = rhs; 2661 } 2662 2663 BinaryOperator(StmtClass SC, EmptyShell Empty) 2664 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2665}; 2666 2667/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2668/// track of the type the operation is performed in. Due to the semantics of 2669/// these operators, the operands are promoted, the aritmetic performed, an 2670/// implicit conversion back to the result type done, then the assignment takes 2671/// place. This captures the intermediate type which the computation is done 2672/// in. 2673class CompoundAssignOperator : public BinaryOperator { 2674 QualType ComputationLHSType; 2675 QualType ComputationResultType; 2676public: 2677 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2678 ExprValueKind VK, ExprObjectKind OK, 2679 QualType CompLHSType, QualType CompResultType, 2680 SourceLocation OpLoc) 2681 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2682 ComputationLHSType(CompLHSType), 2683 ComputationResultType(CompResultType) { 2684 assert(isCompoundAssignmentOp() && 2685 "Only should be used for compound assignments"); 2686 } 2687 2688 /// \brief Build an empty compound assignment operator expression. 2689 explicit CompoundAssignOperator(EmptyShell Empty) 2690 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2691 2692 // The two computation types are the type the LHS is converted 2693 // to for the computation and the type of the result; the two are 2694 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2695 QualType getComputationLHSType() const { return ComputationLHSType; } 2696 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2697 2698 QualType getComputationResultType() const { return ComputationResultType; } 2699 void setComputationResultType(QualType T) { ComputationResultType = T; } 2700 2701 static bool classof(const CompoundAssignOperator *) { return true; } 2702 static bool classof(const Stmt *S) { 2703 return S->getStmtClass() == CompoundAssignOperatorClass; 2704 } 2705}; 2706 2707/// AbstractConditionalOperator - An abstract base class for 2708/// ConditionalOperator and BinaryConditionalOperator. 2709class AbstractConditionalOperator : public Expr { 2710 SourceLocation QuestionLoc, ColonLoc; 2711 friend class ASTStmtReader; 2712 2713protected: 2714 AbstractConditionalOperator(StmtClass SC, QualType T, 2715 ExprValueKind VK, ExprObjectKind OK, 2716 bool TD, bool VD, 2717 bool ContainsUnexpandedParameterPack, 2718 SourceLocation qloc, 2719 SourceLocation cloc) 2720 : Expr(SC, T, VK, OK, TD, VD, ContainsUnexpandedParameterPack), 2721 QuestionLoc(qloc), ColonLoc(cloc) {} 2722 2723 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2724 : Expr(SC, Empty) { } 2725 2726public: 2727 // getCond - Return the expression representing the condition for 2728 // the ?: operator. 2729 Expr *getCond() const; 2730 2731 // getTrueExpr - Return the subexpression representing the value of 2732 // the expression if the condition evaluates to true. 2733 Expr *getTrueExpr() const; 2734 2735 // getFalseExpr - Return the subexpression representing the value of 2736 // the expression if the condition evaluates to false. This is 2737 // the same as getRHS. 2738 Expr *getFalseExpr() const; 2739 2740 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2741 SourceLocation getColonLoc() const { return ColonLoc; } 2742 2743 static bool classof(const Stmt *T) { 2744 return T->getStmtClass() == ConditionalOperatorClass || 2745 T->getStmtClass() == BinaryConditionalOperatorClass; 2746 } 2747 static bool classof(const AbstractConditionalOperator *) { return true; } 2748}; 2749 2750/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2751/// middle" extension is a BinaryConditionalOperator. 2752class ConditionalOperator : public AbstractConditionalOperator { 2753 enum { COND, LHS, RHS, END_EXPR }; 2754 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2755 2756 friend class ASTStmtReader; 2757public: 2758 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2759 SourceLocation CLoc, Expr *rhs, 2760 QualType t, ExprValueKind VK, ExprObjectKind OK) 2761 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 2762 // FIXME: the type of the conditional operator doesn't 2763 // depend on the type of the conditional, but the standard 2764 // seems to imply that it could. File a bug! 2765 (lhs->isTypeDependent() || rhs->isTypeDependent()), 2766 (cond->isValueDependent() || lhs->isValueDependent() || 2767 rhs->isValueDependent()), 2768 (cond->containsUnexpandedParameterPack() || 2769 lhs->containsUnexpandedParameterPack() || 2770 rhs->containsUnexpandedParameterPack()), 2771 QLoc, CLoc) { 2772 SubExprs[COND] = cond; 2773 SubExprs[LHS] = lhs; 2774 SubExprs[RHS] = rhs; 2775 } 2776 2777 /// \brief Build an empty conditional operator. 2778 explicit ConditionalOperator(EmptyShell Empty) 2779 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 2780 2781 // getCond - Return the expression representing the condition for 2782 // the ?: operator. 2783 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2784 2785 // getTrueExpr - Return the subexpression representing the value of 2786 // the expression if the condition evaluates to true. 2787 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 2788 2789 // getFalseExpr - Return the subexpression representing the value of 2790 // the expression if the condition evaluates to false. This is 2791 // the same as getRHS. 2792 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2793 2794 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2795 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2796 2797 SourceRange getSourceRange() const { 2798 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2799 } 2800 static bool classof(const Stmt *T) { 2801 return T->getStmtClass() == ConditionalOperatorClass; 2802 } 2803 static bool classof(const ConditionalOperator *) { return true; } 2804 2805 // Iterators 2806 child_range children() { 2807 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2808 } 2809}; 2810 2811/// BinaryConditionalOperator - The GNU extension to the conditional 2812/// operator which allows the middle operand to be omitted. 2813/// 2814/// This is a different expression kind on the assumption that almost 2815/// every client ends up needing to know that these are different. 2816class BinaryConditionalOperator : public AbstractConditionalOperator { 2817 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 2818 2819 /// - the common condition/left-hand-side expression, which will be 2820 /// evaluated as the opaque value 2821 /// - the condition, expressed in terms of the opaque value 2822 /// - the left-hand-side, expressed in terms of the opaque value 2823 /// - the right-hand-side 2824 Stmt *SubExprs[NUM_SUBEXPRS]; 2825 OpaqueValueExpr *OpaqueValue; 2826 2827 friend class ASTStmtReader; 2828public: 2829 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 2830 Expr *cond, Expr *lhs, Expr *rhs, 2831 SourceLocation qloc, SourceLocation cloc, 2832 QualType t, ExprValueKind VK, ExprObjectKind OK) 2833 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 2834 (common->isTypeDependent() || rhs->isTypeDependent()), 2835 (common->isValueDependent() || rhs->isValueDependent()), 2836 (common->containsUnexpandedParameterPack() || 2837 rhs->containsUnexpandedParameterPack()), 2838 qloc, cloc), 2839 OpaqueValue(opaqueValue) { 2840 SubExprs[COMMON] = common; 2841 SubExprs[COND] = cond; 2842 SubExprs[LHS] = lhs; 2843 SubExprs[RHS] = rhs; 2844 2845 OpaqueValue->setSourceExpr(common); 2846 } 2847 2848 /// \brief Build an empty conditional operator. 2849 explicit BinaryConditionalOperator(EmptyShell Empty) 2850 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 2851 2852 /// \brief getCommon - Return the common expression, written to the 2853 /// left of the condition. The opaque value will be bound to the 2854 /// result of this expression. 2855 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 2856 2857 /// \brief getOpaqueValue - Return the opaque value placeholder. 2858 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 2859 2860 /// \brief getCond - Return the condition expression; this is defined 2861 /// in terms of the opaque value. 2862 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2863 2864 /// \brief getTrueExpr - Return the subexpression which will be 2865 /// evaluated if the condition evaluates to true; this is defined 2866 /// in terms of the opaque value. 2867 Expr *getTrueExpr() const { 2868 return cast<Expr>(SubExprs[LHS]); 2869 } 2870 2871 /// \brief getFalseExpr - Return the subexpression which will be 2872 /// evaluated if the condnition evaluates to false; this is 2873 /// defined in terms of the opaque value. 2874 Expr *getFalseExpr() const { 2875 return cast<Expr>(SubExprs[RHS]); 2876 } 2877 2878 SourceRange getSourceRange() const { 2879 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 2880 } 2881 static bool classof(const Stmt *T) { 2882 return T->getStmtClass() == BinaryConditionalOperatorClass; 2883 } 2884 static bool classof(const BinaryConditionalOperator *) { return true; } 2885 2886 // Iterators 2887 child_range children() { 2888 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 2889 } 2890}; 2891 2892inline Expr *AbstractConditionalOperator::getCond() const { 2893 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2894 return co->getCond(); 2895 return cast<BinaryConditionalOperator>(this)->getCond(); 2896} 2897 2898inline Expr *AbstractConditionalOperator::getTrueExpr() const { 2899 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2900 return co->getTrueExpr(); 2901 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 2902} 2903 2904inline Expr *AbstractConditionalOperator::getFalseExpr() const { 2905 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2906 return co->getFalseExpr(); 2907 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 2908} 2909 2910/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2911class AddrLabelExpr : public Expr { 2912 SourceLocation AmpAmpLoc, LabelLoc; 2913 LabelDecl *Label; 2914public: 2915 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 2916 QualType t) 2917 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false), 2918 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2919 2920 /// \brief Build an empty address of a label expression. 2921 explicit AddrLabelExpr(EmptyShell Empty) 2922 : Expr(AddrLabelExprClass, Empty) { } 2923 2924 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2925 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2926 SourceLocation getLabelLoc() const { return LabelLoc; } 2927 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2928 2929 SourceRange getSourceRange() const { 2930 return SourceRange(AmpAmpLoc, LabelLoc); 2931 } 2932 2933 LabelDecl *getLabel() const { return Label; } 2934 void setLabel(LabelDecl *L) { Label = L; } 2935 2936 static bool classof(const Stmt *T) { 2937 return T->getStmtClass() == AddrLabelExprClass; 2938 } 2939 static bool classof(const AddrLabelExpr *) { return true; } 2940 2941 // Iterators 2942 child_range children() { return child_range(); } 2943}; 2944 2945/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2946/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2947/// takes the value of the last subexpression. 2948/// 2949/// A StmtExpr is always an r-value; values "returned" out of a 2950/// StmtExpr will be copied. 2951class StmtExpr : public Expr { 2952 Stmt *SubStmt; 2953 SourceLocation LParenLoc, RParenLoc; 2954public: 2955 // FIXME: Does type-dependence need to be computed differently? 2956 StmtExpr(CompoundStmt *substmt, QualType T, 2957 SourceLocation lp, SourceLocation rp) : 2958 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 2959 T->isDependentType(), false, false), 2960 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2961 2962 /// \brief Build an empty statement expression. 2963 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2964 2965 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2966 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2967 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2968 2969 SourceRange getSourceRange() const { 2970 return SourceRange(LParenLoc, RParenLoc); 2971 } 2972 2973 SourceLocation getLParenLoc() const { return LParenLoc; } 2974 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2975 SourceLocation getRParenLoc() const { return RParenLoc; } 2976 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2977 2978 static bool classof(const Stmt *T) { 2979 return T->getStmtClass() == StmtExprClass; 2980 } 2981 static bool classof(const StmtExpr *) { return true; } 2982 2983 // Iterators 2984 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 2985}; 2986 2987 2988/// ShuffleVectorExpr - clang-specific builtin-in function 2989/// __builtin_shufflevector. 2990/// This AST node represents a operator that does a constant 2991/// shuffle, similar to LLVM's shufflevector instruction. It takes 2992/// two vectors and a variable number of constant indices, 2993/// and returns the appropriately shuffled vector. 2994class ShuffleVectorExpr : public Expr { 2995 SourceLocation BuiltinLoc, RParenLoc; 2996 2997 // SubExprs - the list of values passed to the __builtin_shufflevector 2998 // function. The first two are vectors, and the rest are constant 2999 // indices. The number of values in this list is always 3000 // 2+the number of indices in the vector type. 3001 Stmt **SubExprs; 3002 unsigned NumExprs; 3003 3004public: 3005 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 3006 QualType Type, SourceLocation BLoc, 3007 SourceLocation RP); 3008 3009 /// \brief Build an empty vector-shuffle expression. 3010 explicit ShuffleVectorExpr(EmptyShell Empty) 3011 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 3012 3013 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3014 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3015 3016 SourceLocation getRParenLoc() const { return RParenLoc; } 3017 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3018 3019 SourceRange getSourceRange() const { 3020 return SourceRange(BuiltinLoc, RParenLoc); 3021 } 3022 static bool classof(const Stmt *T) { 3023 return T->getStmtClass() == ShuffleVectorExprClass; 3024 } 3025 static bool classof(const ShuffleVectorExpr *) { return true; } 3026 3027 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 3028 /// constant expression, the actual arguments passed in, and the function 3029 /// pointers. 3030 unsigned getNumSubExprs() const { return NumExprs; } 3031 3032 /// \brief Retrieve the array of expressions. 3033 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 3034 3035 /// getExpr - Return the Expr at the specified index. 3036 Expr *getExpr(unsigned Index) { 3037 assert((Index < NumExprs) && "Arg access out of range!"); 3038 return cast<Expr>(SubExprs[Index]); 3039 } 3040 const Expr *getExpr(unsigned Index) const { 3041 assert((Index < NumExprs) && "Arg access out of range!"); 3042 return cast<Expr>(SubExprs[Index]); 3043 } 3044 3045 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 3046 3047 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 3048 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 3049 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 3050 } 3051 3052 // Iterators 3053 child_range children() { 3054 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 3055 } 3056}; 3057 3058/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 3059/// This AST node is similar to the conditional operator (?:) in C, with 3060/// the following exceptions: 3061/// - the test expression must be a integer constant expression. 3062/// - the expression returned acts like the chosen subexpression in every 3063/// visible way: the type is the same as that of the chosen subexpression, 3064/// and all predicates (whether it's an l-value, whether it's an integer 3065/// constant expression, etc.) return the same result as for the chosen 3066/// sub-expression. 3067class ChooseExpr : public Expr { 3068 enum { COND, LHS, RHS, END_EXPR }; 3069 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3070 SourceLocation BuiltinLoc, RParenLoc; 3071public: 3072 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3073 QualType t, ExprValueKind VK, ExprObjectKind OK, 3074 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3075 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3076 (cond->containsUnexpandedParameterPack() || 3077 lhs->containsUnexpandedParameterPack() || 3078 rhs->containsUnexpandedParameterPack())), 3079 BuiltinLoc(BLoc), RParenLoc(RP) { 3080 SubExprs[COND] = cond; 3081 SubExprs[LHS] = lhs; 3082 SubExprs[RHS] = rhs; 3083 } 3084 3085 /// \brief Build an empty __builtin_choose_expr. 3086 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3087 3088 /// isConditionTrue - Return whether the condition is true (i.e. not 3089 /// equal to zero). 3090 bool isConditionTrue(const ASTContext &C) const; 3091 3092 /// getChosenSubExpr - Return the subexpression chosen according to the 3093 /// condition. 3094 Expr *getChosenSubExpr(const ASTContext &C) const { 3095 return isConditionTrue(C) ? getLHS() : getRHS(); 3096 } 3097 3098 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3099 void setCond(Expr *E) { SubExprs[COND] = E; } 3100 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3101 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3102 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3103 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3104 3105 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3106 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3107 3108 SourceLocation getRParenLoc() const { return RParenLoc; } 3109 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3110 3111 SourceRange getSourceRange() const { 3112 return SourceRange(BuiltinLoc, RParenLoc); 3113 } 3114 static bool classof(const Stmt *T) { 3115 return T->getStmtClass() == ChooseExprClass; 3116 } 3117 static bool classof(const ChooseExpr *) { return true; } 3118 3119 // Iterators 3120 child_range children() { 3121 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3122 } 3123}; 3124 3125/// GNUNullExpr - Implements the GNU __null extension, which is a name 3126/// for a null pointer constant that has integral type (e.g., int or 3127/// long) and is the same size and alignment as a pointer. The __null 3128/// extension is typically only used by system headers, which define 3129/// NULL as __null in C++ rather than using 0 (which is an integer 3130/// that may not match the size of a pointer). 3131class GNUNullExpr : public Expr { 3132 /// TokenLoc - The location of the __null keyword. 3133 SourceLocation TokenLoc; 3134 3135public: 3136 GNUNullExpr(QualType Ty, SourceLocation Loc) 3137 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false), 3138 TokenLoc(Loc) { } 3139 3140 /// \brief Build an empty GNU __null expression. 3141 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3142 3143 /// getTokenLocation - The location of the __null token. 3144 SourceLocation getTokenLocation() const { return TokenLoc; } 3145 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3146 3147 SourceRange getSourceRange() const { 3148 return SourceRange(TokenLoc); 3149 } 3150 static bool classof(const Stmt *T) { 3151 return T->getStmtClass() == GNUNullExprClass; 3152 } 3153 static bool classof(const GNUNullExpr *) { return true; } 3154 3155 // Iterators 3156 child_range children() { return child_range(); } 3157}; 3158 3159/// VAArgExpr, used for the builtin function __builtin_va_arg. 3160class VAArgExpr : public Expr { 3161 Stmt *Val; 3162 TypeSourceInfo *TInfo; 3163 SourceLocation BuiltinLoc, RParenLoc; 3164public: 3165 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3166 SourceLocation RPLoc, QualType t) 3167 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3168 t->isDependentType(), false, 3169 (TInfo->getType()->containsUnexpandedParameterPack() || 3170 e->containsUnexpandedParameterPack())), 3171 Val(e), TInfo(TInfo), 3172 BuiltinLoc(BLoc), 3173 RParenLoc(RPLoc) { } 3174 3175 /// \brief Create an empty __builtin_va_arg expression. 3176 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3177 3178 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3179 Expr *getSubExpr() { return cast<Expr>(Val); } 3180 void setSubExpr(Expr *E) { Val = E; } 3181 3182 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3183 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3184 3185 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3186 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3187 3188 SourceLocation getRParenLoc() const { return RParenLoc; } 3189 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3190 3191 SourceRange getSourceRange() const { 3192 return SourceRange(BuiltinLoc, RParenLoc); 3193 } 3194 static bool classof(const Stmt *T) { 3195 return T->getStmtClass() == VAArgExprClass; 3196 } 3197 static bool classof(const VAArgExpr *) { return true; } 3198 3199 // Iterators 3200 child_range children() { return child_range(&Val, &Val+1); } 3201}; 3202 3203/// @brief Describes an C or C++ initializer list. 3204/// 3205/// InitListExpr describes an initializer list, which can be used to 3206/// initialize objects of different types, including 3207/// struct/class/union types, arrays, and vectors. For example: 3208/// 3209/// @code 3210/// struct foo x = { 1, { 2, 3 } }; 3211/// @endcode 3212/// 3213/// Prior to semantic analysis, an initializer list will represent the 3214/// initializer list as written by the user, but will have the 3215/// placeholder type "void". This initializer list is called the 3216/// syntactic form of the initializer, and may contain C99 designated 3217/// initializers (represented as DesignatedInitExprs), initializations 3218/// of subobject members without explicit braces, and so on. Clients 3219/// interested in the original syntax of the initializer list should 3220/// use the syntactic form of the initializer list. 3221/// 3222/// After semantic analysis, the initializer list will represent the 3223/// semantic form of the initializer, where the initializations of all 3224/// subobjects are made explicit with nested InitListExpr nodes and 3225/// C99 designators have been eliminated by placing the designated 3226/// initializations into the subobject they initialize. Additionally, 3227/// any "holes" in the initialization, where no initializer has been 3228/// specified for a particular subobject, will be replaced with 3229/// implicitly-generated ImplicitValueInitExpr expressions that 3230/// value-initialize the subobjects. Note, however, that the 3231/// initializer lists may still have fewer initializers than there are 3232/// elements to initialize within the object. 3233/// 3234/// Given the semantic form of the initializer list, one can retrieve 3235/// the original syntactic form of that initializer list (if it 3236/// exists) using getSyntacticForm(). Since many initializer lists 3237/// have the same syntactic and semantic forms, getSyntacticForm() may 3238/// return NULL, indicating that the current initializer list also 3239/// serves as its syntactic form. 3240class InitListExpr : public Expr { 3241 // FIXME: Eliminate this vector in favor of ASTContext allocation 3242 typedef ASTVector<Stmt *> InitExprsTy; 3243 InitExprsTy InitExprs; 3244 SourceLocation LBraceLoc, RBraceLoc; 3245 3246 /// Contains the initializer list that describes the syntactic form 3247 /// written in the source code. 3248 InitListExpr *SyntacticForm; 3249 3250 /// \brief Either: 3251 /// If this initializer list initializes an array with more elements than 3252 /// there are initializers in the list, specifies an expression to be used 3253 /// for value initialization of the rest of the elements. 3254 /// Or 3255 /// If this initializer list initializes a union, specifies which 3256 /// field within the union will be initialized. 3257 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3258 3259 /// Whether this initializer list originally had a GNU array-range 3260 /// designator in it. This is a temporary marker used by CodeGen. 3261 bool HadArrayRangeDesignator; 3262 3263public: 3264 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3265 Expr **initexprs, unsigned numinits, 3266 SourceLocation rbraceloc); 3267 3268 /// \brief Build an empty initializer list. 3269 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3270 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3271 3272 unsigned getNumInits() const { return InitExprs.size(); } 3273 3274 /// \brief Retrieve the set of initializers. 3275 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3276 3277 const Expr *getInit(unsigned Init) const { 3278 assert(Init < getNumInits() && "Initializer access out of range!"); 3279 return cast_or_null<Expr>(InitExprs[Init]); 3280 } 3281 3282 Expr *getInit(unsigned Init) { 3283 assert(Init < getNumInits() && "Initializer access out of range!"); 3284 return cast_or_null<Expr>(InitExprs[Init]); 3285 } 3286 3287 void setInit(unsigned Init, Expr *expr) { 3288 assert(Init < getNumInits() && "Initializer access out of range!"); 3289 InitExprs[Init] = expr; 3290 } 3291 3292 /// \brief Reserve space for some number of initializers. 3293 void reserveInits(ASTContext &C, unsigned NumInits); 3294 3295 /// @brief Specify the number of initializers 3296 /// 3297 /// If there are more than @p NumInits initializers, the remaining 3298 /// initializers will be destroyed. If there are fewer than @p 3299 /// NumInits initializers, NULL expressions will be added for the 3300 /// unknown initializers. 3301 void resizeInits(ASTContext &Context, unsigned NumInits); 3302 3303 /// @brief Updates the initializer at index @p Init with the new 3304 /// expression @p expr, and returns the old expression at that 3305 /// location. 3306 /// 3307 /// When @p Init is out of range for this initializer list, the 3308 /// initializer list will be extended with NULL expressions to 3309 /// accommodate the new entry. 3310 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3311 3312 /// \brief If this initializer list initializes an array with more elements 3313 /// than there are initializers in the list, specifies an expression to be 3314 /// used for value initialization of the rest of the elements. 3315 Expr *getArrayFiller() { 3316 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3317 } 3318 const Expr *getArrayFiller() const { 3319 return const_cast<InitListExpr *>(this)->getArrayFiller(); 3320 } 3321 void setArrayFiller(Expr *filler); 3322 3323 /// \brief If this initializes a union, specifies which field in the 3324 /// union to initialize. 3325 /// 3326 /// Typically, this field is the first named field within the 3327 /// union. However, a designated initializer can specify the 3328 /// initialization of a different field within the union. 3329 FieldDecl *getInitializedFieldInUnion() { 3330 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3331 } 3332 const FieldDecl *getInitializedFieldInUnion() const { 3333 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion(); 3334 } 3335 void setInitializedFieldInUnion(FieldDecl *FD) { 3336 ArrayFillerOrUnionFieldInit = FD; 3337 } 3338 3339 // Explicit InitListExpr's originate from source code (and have valid source 3340 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3341 bool isExplicit() { 3342 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3343 } 3344 3345 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3346 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3347 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3348 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3349 3350 /// @brief Retrieve the initializer list that describes the 3351 /// syntactic form of the initializer. 3352 /// 3353 /// 3354 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3355 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3356 3357 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3358 void sawArrayRangeDesignator(bool ARD = true) { 3359 HadArrayRangeDesignator = ARD; 3360 } 3361 3362 SourceRange getSourceRange() const; 3363 3364 static bool classof(const Stmt *T) { 3365 return T->getStmtClass() == InitListExprClass; 3366 } 3367 static bool classof(const InitListExpr *) { return true; } 3368 3369 // Iterators 3370 child_range children() { 3371 if (InitExprs.empty()) return child_range(); 3372 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3373 } 3374 3375 typedef InitExprsTy::iterator iterator; 3376 typedef InitExprsTy::const_iterator const_iterator; 3377 typedef InitExprsTy::reverse_iterator reverse_iterator; 3378 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3379 3380 iterator begin() { return InitExprs.begin(); } 3381 const_iterator begin() const { return InitExprs.begin(); } 3382 iterator end() { return InitExprs.end(); } 3383 const_iterator end() const { return InitExprs.end(); } 3384 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3385 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3386 reverse_iterator rend() { return InitExprs.rend(); } 3387 const_reverse_iterator rend() const { return InitExprs.rend(); } 3388 3389 friend class ASTStmtReader; 3390 friend class ASTStmtWriter; 3391}; 3392 3393/// @brief Represents a C99 designated initializer expression. 3394/// 3395/// A designated initializer expression (C99 6.7.8) contains one or 3396/// more designators (which can be field designators, array 3397/// designators, or GNU array-range designators) followed by an 3398/// expression that initializes the field or element(s) that the 3399/// designators refer to. For example, given: 3400/// 3401/// @code 3402/// struct point { 3403/// double x; 3404/// double y; 3405/// }; 3406/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3407/// @endcode 3408/// 3409/// The InitListExpr contains three DesignatedInitExprs, the first of 3410/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3411/// designators, one array designator for @c [2] followed by one field 3412/// designator for @c .y. The initalization expression will be 1.0. 3413class DesignatedInitExpr : public Expr { 3414public: 3415 /// \brief Forward declaration of the Designator class. 3416 class Designator; 3417 3418private: 3419 /// The location of the '=' or ':' prior to the actual initializer 3420 /// expression. 3421 SourceLocation EqualOrColonLoc; 3422 3423 /// Whether this designated initializer used the GNU deprecated 3424 /// syntax rather than the C99 '=' syntax. 3425 bool GNUSyntax : 1; 3426 3427 /// The number of designators in this initializer expression. 3428 unsigned NumDesignators : 15; 3429 3430 /// \brief The designators in this designated initialization 3431 /// expression. 3432 Designator *Designators; 3433 3434 /// The number of subexpressions of this initializer expression, 3435 /// which contains both the initializer and any additional 3436 /// expressions used by array and array-range designators. 3437 unsigned NumSubExprs : 16; 3438 3439 3440 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3441 const Designator *Designators, 3442 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3443 Expr **IndexExprs, unsigned NumIndexExprs, 3444 Expr *Init); 3445 3446 explicit DesignatedInitExpr(unsigned NumSubExprs) 3447 : Expr(DesignatedInitExprClass, EmptyShell()), 3448 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3449 3450public: 3451 /// A field designator, e.g., ".x". 3452 struct FieldDesignator { 3453 /// Refers to the field that is being initialized. The low bit 3454 /// of this field determines whether this is actually a pointer 3455 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3456 /// initially constructed, a field designator will store an 3457 /// IdentifierInfo*. After semantic analysis has resolved that 3458 /// name, the field designator will instead store a FieldDecl*. 3459 uintptr_t NameOrField; 3460 3461 /// The location of the '.' in the designated initializer. 3462 unsigned DotLoc; 3463 3464 /// The location of the field name in the designated initializer. 3465 unsigned FieldLoc; 3466 }; 3467 3468 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3469 struct ArrayOrRangeDesignator { 3470 /// Location of the first index expression within the designated 3471 /// initializer expression's list of subexpressions. 3472 unsigned Index; 3473 /// The location of the '[' starting the array range designator. 3474 unsigned LBracketLoc; 3475 /// The location of the ellipsis separating the start and end 3476 /// indices. Only valid for GNU array-range designators. 3477 unsigned EllipsisLoc; 3478 /// The location of the ']' terminating the array range designator. 3479 unsigned RBracketLoc; 3480 }; 3481 3482 /// @brief Represents a single C99 designator. 3483 /// 3484 /// @todo This class is infuriatingly similar to clang::Designator, 3485 /// but minor differences (storing indices vs. storing pointers) 3486 /// keep us from reusing it. Try harder, later, to rectify these 3487 /// differences. 3488 class Designator { 3489 /// @brief The kind of designator this describes. 3490 enum { 3491 FieldDesignator, 3492 ArrayDesignator, 3493 ArrayRangeDesignator 3494 } Kind; 3495 3496 union { 3497 /// A field designator, e.g., ".x". 3498 struct FieldDesignator Field; 3499 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3500 struct ArrayOrRangeDesignator ArrayOrRange; 3501 }; 3502 friend class DesignatedInitExpr; 3503 3504 public: 3505 Designator() {} 3506 3507 /// @brief Initializes a field designator. 3508 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3509 SourceLocation FieldLoc) 3510 : Kind(FieldDesignator) { 3511 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3512 Field.DotLoc = DotLoc.getRawEncoding(); 3513 Field.FieldLoc = FieldLoc.getRawEncoding(); 3514 } 3515 3516 /// @brief Initializes an array designator. 3517 Designator(unsigned Index, SourceLocation LBracketLoc, 3518 SourceLocation RBracketLoc) 3519 : Kind(ArrayDesignator) { 3520 ArrayOrRange.Index = Index; 3521 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3522 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3523 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3524 } 3525 3526 /// @brief Initializes a GNU array-range designator. 3527 Designator(unsigned Index, SourceLocation LBracketLoc, 3528 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3529 : Kind(ArrayRangeDesignator) { 3530 ArrayOrRange.Index = Index; 3531 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3532 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3533 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3534 } 3535 3536 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3537 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3538 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3539 3540 IdentifierInfo *getFieldName() const; 3541 3542 FieldDecl *getField() const { 3543 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3544 if (Field.NameOrField & 0x01) 3545 return 0; 3546 else 3547 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3548 } 3549 3550 void setField(FieldDecl *FD) { 3551 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3552 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3553 } 3554 3555 SourceLocation getDotLoc() const { 3556 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3557 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3558 } 3559 3560 SourceLocation getFieldLoc() const { 3561 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3562 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3563 } 3564 3565 SourceLocation getLBracketLoc() const { 3566 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3567 "Only valid on an array or array-range designator"); 3568 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3569 } 3570 3571 SourceLocation getRBracketLoc() const { 3572 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3573 "Only valid on an array or array-range designator"); 3574 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3575 } 3576 3577 SourceLocation getEllipsisLoc() const { 3578 assert(Kind == ArrayRangeDesignator && 3579 "Only valid on an array-range designator"); 3580 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3581 } 3582 3583 unsigned getFirstExprIndex() const { 3584 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3585 "Only valid on an array or array-range designator"); 3586 return ArrayOrRange.Index; 3587 } 3588 3589 SourceLocation getStartLocation() const { 3590 if (Kind == FieldDesignator) 3591 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3592 else 3593 return getLBracketLoc(); 3594 } 3595 SourceLocation getEndLocation() const { 3596 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3597 } 3598 SourceRange getSourceRange() const { 3599 return SourceRange(getStartLocation(), getEndLocation()); 3600 } 3601 }; 3602 3603 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3604 unsigned NumDesignators, 3605 Expr **IndexExprs, unsigned NumIndexExprs, 3606 SourceLocation EqualOrColonLoc, 3607 bool GNUSyntax, Expr *Init); 3608 3609 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3610 3611 /// @brief Returns the number of designators in this initializer. 3612 unsigned size() const { return NumDesignators; } 3613 3614 // Iterator access to the designators. 3615 typedef Designator *designators_iterator; 3616 designators_iterator designators_begin() { return Designators; } 3617 designators_iterator designators_end() { 3618 return Designators + NumDesignators; 3619 } 3620 3621 typedef const Designator *const_designators_iterator; 3622 const_designators_iterator designators_begin() const { return Designators; } 3623 const_designators_iterator designators_end() const { 3624 return Designators + NumDesignators; 3625 } 3626 3627 typedef std::reverse_iterator<designators_iterator> 3628 reverse_designators_iterator; 3629 reverse_designators_iterator designators_rbegin() { 3630 return reverse_designators_iterator(designators_end()); 3631 } 3632 reverse_designators_iterator designators_rend() { 3633 return reverse_designators_iterator(designators_begin()); 3634 } 3635 3636 typedef std::reverse_iterator<const_designators_iterator> 3637 const_reverse_designators_iterator; 3638 const_reverse_designators_iterator designators_rbegin() const { 3639 return const_reverse_designators_iterator(designators_end()); 3640 } 3641 const_reverse_designators_iterator designators_rend() const { 3642 return const_reverse_designators_iterator(designators_begin()); 3643 } 3644 3645 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3646 3647 void setDesignators(ASTContext &C, const Designator *Desigs, 3648 unsigned NumDesigs); 3649 3650 Expr *getArrayIndex(const Designator& D); 3651 Expr *getArrayRangeStart(const Designator& D); 3652 Expr *getArrayRangeEnd(const Designator& D); 3653 3654 /// @brief Retrieve the location of the '=' that precedes the 3655 /// initializer value itself, if present. 3656 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3657 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3658 3659 /// @brief Determines whether this designated initializer used the 3660 /// deprecated GNU syntax for designated initializers. 3661 bool usesGNUSyntax() const { return GNUSyntax; } 3662 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3663 3664 /// @brief Retrieve the initializer value. 3665 Expr *getInit() const { 3666 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3667 } 3668 3669 void setInit(Expr *init) { 3670 *child_begin() = init; 3671 } 3672 3673 /// \brief Retrieve the total number of subexpressions in this 3674 /// designated initializer expression, including the actual 3675 /// initialized value and any expressions that occur within array 3676 /// and array-range designators. 3677 unsigned getNumSubExprs() const { return NumSubExprs; } 3678 3679 Expr *getSubExpr(unsigned Idx) { 3680 assert(Idx < NumSubExprs && "Subscript out of range"); 3681 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3682 Ptr += sizeof(DesignatedInitExpr); 3683 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3684 } 3685 3686 void setSubExpr(unsigned Idx, Expr *E) { 3687 assert(Idx < NumSubExprs && "Subscript out of range"); 3688 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3689 Ptr += sizeof(DesignatedInitExpr); 3690 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3691 } 3692 3693 /// \brief Replaces the designator at index @p Idx with the series 3694 /// of designators in [First, Last). 3695 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3696 const Designator *Last); 3697 3698 SourceRange getDesignatorsSourceRange() const; 3699 3700 SourceRange getSourceRange() const; 3701 3702 static bool classof(const Stmt *T) { 3703 return T->getStmtClass() == DesignatedInitExprClass; 3704 } 3705 static bool classof(const DesignatedInitExpr *) { return true; } 3706 3707 // Iterators 3708 child_range children() { 3709 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3710 return child_range(begin, begin + NumSubExprs); 3711 } 3712}; 3713 3714/// \brief Represents an implicitly-generated value initialization of 3715/// an object of a given type. 3716/// 3717/// Implicit value initializations occur within semantic initializer 3718/// list expressions (InitListExpr) as placeholders for subobject 3719/// initializations not explicitly specified by the user. 3720/// 3721/// \see InitListExpr 3722class ImplicitValueInitExpr : public Expr { 3723public: 3724 explicit ImplicitValueInitExpr(QualType ty) 3725 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3726 false, false, false) { } 3727 3728 /// \brief Construct an empty implicit value initialization. 3729 explicit ImplicitValueInitExpr(EmptyShell Empty) 3730 : Expr(ImplicitValueInitExprClass, Empty) { } 3731 3732 static bool classof(const Stmt *T) { 3733 return T->getStmtClass() == ImplicitValueInitExprClass; 3734 } 3735 static bool classof(const ImplicitValueInitExpr *) { return true; } 3736 3737 SourceRange getSourceRange() const { 3738 return SourceRange(); 3739 } 3740 3741 // Iterators 3742 child_range children() { return child_range(); } 3743}; 3744 3745 3746class ParenListExpr : public Expr { 3747 Stmt **Exprs; 3748 unsigned NumExprs; 3749 SourceLocation LParenLoc, RParenLoc; 3750 3751public: 3752 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3753 unsigned numexprs, SourceLocation rparenloc, QualType T); 3754 3755 /// \brief Build an empty paren list. 3756 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3757 3758 unsigned getNumExprs() const { return NumExprs; } 3759 3760 const Expr* getExpr(unsigned Init) const { 3761 assert(Init < getNumExprs() && "Initializer access out of range!"); 3762 return cast_or_null<Expr>(Exprs[Init]); 3763 } 3764 3765 Expr* getExpr(unsigned Init) { 3766 assert(Init < getNumExprs() && "Initializer access out of range!"); 3767 return cast_or_null<Expr>(Exprs[Init]); 3768 } 3769 3770 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3771 3772 SourceLocation getLParenLoc() const { return LParenLoc; } 3773 SourceLocation getRParenLoc() const { return RParenLoc; } 3774 3775 SourceRange getSourceRange() const { 3776 return SourceRange(LParenLoc, RParenLoc); 3777 } 3778 static bool classof(const Stmt *T) { 3779 return T->getStmtClass() == ParenListExprClass; 3780 } 3781 static bool classof(const ParenListExpr *) { return true; } 3782 3783 // Iterators 3784 child_range children() { 3785 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 3786 } 3787 3788 friend class ASTStmtReader; 3789 friend class ASTStmtWriter; 3790}; 3791 3792 3793/// \brief Represents a C1X generic selection. 3794/// 3795/// A generic selection (C1X 6.5.1.1) contains an unevaluated controlling 3796/// expression, followed by one or more generic associations. Each generic 3797/// association specifies a type name and an expression, or "default" and an 3798/// expression (in which case it is known as a default generic association). 3799/// The type and value of the generic selection are identical to those of its 3800/// result expression, which is defined as the expression in the generic 3801/// association with a type name that is compatible with the type of the 3802/// controlling expression, or the expression in the default generic association 3803/// if no types are compatible. For example: 3804/// 3805/// @code 3806/// _Generic(X, double: 1, float: 2, default: 3) 3807/// @endcode 3808/// 3809/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 3810/// or 3 if "hello". 3811/// 3812/// As an extension, generic selections are allowed in C++, where the following 3813/// additional semantics apply: 3814/// 3815/// Any generic selection whose controlling expression is type-dependent or 3816/// which names a dependent type in its association list is result-dependent, 3817/// which means that the choice of result expression is dependent. 3818/// Result-dependent generic associations are both type- and value-dependent. 3819class GenericSelectionExpr : public Expr { 3820 enum { CONTROLLING, END_EXPR }; 3821 TypeSourceInfo **AssocTypes; 3822 Stmt **SubExprs; 3823 unsigned NumAssocs, ResultIndex; 3824 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 3825 3826public: 3827 GenericSelectionExpr(ASTContext &Context, 3828 SourceLocation GenericLoc, Expr *ControllingExpr, 3829 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3830 unsigned NumAssocs, SourceLocation DefaultLoc, 3831 SourceLocation RParenLoc, 3832 bool ContainsUnexpandedParameterPack, 3833 unsigned ResultIndex); 3834 3835 /// This constructor is used in the result-dependent case. 3836 GenericSelectionExpr(ASTContext &Context, 3837 SourceLocation GenericLoc, Expr *ControllingExpr, 3838 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3839 unsigned NumAssocs, SourceLocation DefaultLoc, 3840 SourceLocation RParenLoc, 3841 bool ContainsUnexpandedParameterPack); 3842 3843 explicit GenericSelectionExpr(EmptyShell Empty) 3844 : Expr(GenericSelectionExprClass, Empty) { } 3845 3846 unsigned getNumAssocs() const { return NumAssocs; } 3847 3848 SourceLocation getGenericLoc() const { return GenericLoc; } 3849 SourceLocation getDefaultLoc() const { return DefaultLoc; } 3850 SourceLocation getRParenLoc() const { return RParenLoc; } 3851 3852 const Expr *getAssocExpr(unsigned i) const { 3853 return cast<Expr>(SubExprs[END_EXPR+i]); 3854 } 3855 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 3856 3857 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 3858 return AssocTypes[i]; 3859 } 3860 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 3861 3862 QualType getAssocType(unsigned i) const { 3863 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 3864 return TS->getType(); 3865 else 3866 return QualType(); 3867 } 3868 3869 const Expr *getControllingExpr() const { 3870 return cast<Expr>(SubExprs[CONTROLLING]); 3871 } 3872 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 3873 3874 /// Whether this generic selection is result-dependent. 3875 bool isResultDependent() const { return ResultIndex == -1U; } 3876 3877 /// The zero-based index of the result expression's generic association in 3878 /// the generic selection's association list. Defined only if the 3879 /// generic selection is not result-dependent. 3880 unsigned getResultIndex() const { 3881 assert(!isResultDependent() && "Generic selection is result-dependent"); 3882 return ResultIndex; 3883 } 3884 3885 /// The generic selection's result expression. Defined only if the 3886 /// generic selection is not result-dependent. 3887 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 3888 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 3889 3890 SourceRange getSourceRange() const { 3891 return SourceRange(GenericLoc, RParenLoc); 3892 } 3893 static bool classof(const Stmt *T) { 3894 return T->getStmtClass() == GenericSelectionExprClass; 3895 } 3896 static bool classof(const GenericSelectionExpr *) { return true; } 3897 3898 child_range children() { 3899 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 3900 } 3901 3902 friend class ASTStmtReader; 3903}; 3904 3905//===----------------------------------------------------------------------===// 3906// Clang Extensions 3907//===----------------------------------------------------------------------===// 3908 3909 3910/// ExtVectorElementExpr - This represents access to specific elements of a 3911/// vector, and may occur on the left hand side or right hand side. For example 3912/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3913/// 3914/// Note that the base may have either vector or pointer to vector type, just 3915/// like a struct field reference. 3916/// 3917class ExtVectorElementExpr : public Expr { 3918 Stmt *Base; 3919 IdentifierInfo *Accessor; 3920 SourceLocation AccessorLoc; 3921public: 3922 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 3923 IdentifierInfo &accessor, SourceLocation loc) 3924 : Expr(ExtVectorElementExprClass, ty, VK, 3925 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 3926 base->isTypeDependent(), base->isValueDependent(), 3927 base->containsUnexpandedParameterPack()), 3928 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3929 3930 /// \brief Build an empty vector element expression. 3931 explicit ExtVectorElementExpr(EmptyShell Empty) 3932 : Expr(ExtVectorElementExprClass, Empty) { } 3933 3934 const Expr *getBase() const { return cast<Expr>(Base); } 3935 Expr *getBase() { return cast<Expr>(Base); } 3936 void setBase(Expr *E) { Base = E; } 3937 3938 IdentifierInfo &getAccessor() const { return *Accessor; } 3939 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3940 3941 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3942 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3943 3944 /// getNumElements - Get the number of components being selected. 3945 unsigned getNumElements() const; 3946 3947 /// containsDuplicateElements - Return true if any element access is 3948 /// repeated. 3949 bool containsDuplicateElements() const; 3950 3951 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3952 /// aggregate Constant of ConstantInt(s). 3953 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3954 3955 SourceRange getSourceRange() const { 3956 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3957 } 3958 3959 /// isArrow - Return true if the base expression is a pointer to vector, 3960 /// return false if the base expression is a vector. 3961 bool isArrow() const; 3962 3963 static bool classof(const Stmt *T) { 3964 return T->getStmtClass() == ExtVectorElementExprClass; 3965 } 3966 static bool classof(const ExtVectorElementExpr *) { return true; } 3967 3968 // Iterators 3969 child_range children() { return child_range(&Base, &Base+1); } 3970}; 3971 3972 3973/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3974/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3975class BlockExpr : public Expr { 3976protected: 3977 BlockDecl *TheBlock; 3978public: 3979 BlockExpr(BlockDecl *BD, QualType ty) 3980 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 3981 ty->isDependentType(), false, false), 3982 TheBlock(BD) {} 3983 3984 /// \brief Build an empty block expression. 3985 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3986 3987 const BlockDecl *getBlockDecl() const { return TheBlock; } 3988 BlockDecl *getBlockDecl() { return TheBlock; } 3989 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3990 3991 // Convenience functions for probing the underlying BlockDecl. 3992 SourceLocation getCaretLocation() const; 3993 const Stmt *getBody() const; 3994 Stmt *getBody(); 3995 3996 SourceRange getSourceRange() const { 3997 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3998 } 3999 4000 /// getFunctionType - Return the underlying function type for this block. 4001 const FunctionType *getFunctionType() const; 4002 4003 static bool classof(const Stmt *T) { 4004 return T->getStmtClass() == BlockExprClass; 4005 } 4006 static bool classof(const BlockExpr *) { return true; } 4007 4008 // Iterators 4009 child_range children() { return child_range(); } 4010}; 4011 4012/// BlockDeclRefExpr - A reference to a local variable declared in an 4013/// enclosing scope. 4014class BlockDeclRefExpr : public Expr { 4015 VarDecl *D; 4016 SourceLocation Loc; 4017 bool IsByRef : 1; 4018 bool ConstQualAdded : 1; 4019public: 4020 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 4021 SourceLocation l, bool ByRef, bool constAdded = false); 4022 4023 // \brief Build an empty reference to a declared variable in a 4024 // block. 4025 explicit BlockDeclRefExpr(EmptyShell Empty) 4026 : Expr(BlockDeclRefExprClass, Empty) { } 4027 4028 VarDecl *getDecl() { return D; } 4029 const VarDecl *getDecl() const { return D; } 4030 void setDecl(VarDecl *VD) { D = VD; } 4031 4032 SourceLocation getLocation() const { return Loc; } 4033 void setLocation(SourceLocation L) { Loc = L; } 4034 4035 SourceRange getSourceRange() const { return SourceRange(Loc); } 4036 4037 bool isByRef() const { return IsByRef; } 4038 void setByRef(bool BR) { IsByRef = BR; } 4039 4040 bool isConstQualAdded() const { return ConstQualAdded; } 4041 void setConstQualAdded(bool C) { ConstQualAdded = C; } 4042 4043 static bool classof(const Stmt *T) { 4044 return T->getStmtClass() == BlockDeclRefExprClass; 4045 } 4046 static bool classof(const BlockDeclRefExpr *) { return true; } 4047 4048 // Iterators 4049 child_range children() { return child_range(); } 4050}; 4051 4052/// AsTypeExpr - Clang builtin function __builtin_astype [OpenCL 6.2.4.2] 4053/// This AST node provides support for reinterpreting a type to another 4054/// type of the same size. 4055class AsTypeExpr : public Expr { 4056private: 4057 Expr* SrcExpr; 4058 QualType DstType; 4059 SourceLocation BuiltinLoc, RParenLoc; 4060 4061public: 4062 AsTypeExpr(Expr* SrcExpr, QualType DstType, 4063 ExprValueKind VK, ExprObjectKind OK, 4064 SourceLocation BuiltinLoc, SourceLocation RParenLoc) 4065 : Expr(AsTypeExprClass, DstType, VK, OK, false, false, false), 4066 SrcExpr(SrcExpr), DstType(DstType), 4067 BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {} 4068 4069 /// \brief Build an empty __builtin_astype 4070 explicit AsTypeExpr(EmptyShell Empty) : Expr(AsTypeExprClass, Empty) {} 4071 4072 /// getSrcExpr - Return the Expr to be converted. 4073 Expr *getSrcExpr() const { return SrcExpr; } 4074 QualType getDstType() const { return DstType; } 4075 4076 SourceRange getSourceRange() const { 4077 return SourceRange(BuiltinLoc, RParenLoc); 4078 } 4079 4080 static bool classof(const Stmt *T) { 4081 return T->getStmtClass() == AsTypeExprClass; 4082 } 4083 static bool classof(const AsTypeExpr *) { return true; } 4084 4085 // Iterators 4086 child_range children() { return child_range(); } 4087}; 4088} // end namespace clang 4089 4090#endif 4091