Expr.h revision c69a505cfa318d571ce8a0cd038c8d958585a735
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 Result type of CanThrow(). 490 enum CanThrowResult { 491 CT_Cannot, 492 CT_Dependent, 493 CT_Can 494 }; 495 /// \brief Test if this expression, if evaluated, might throw, according to 496 /// the rules of C++ [expr.unary.noexcept]. 497 CanThrowResult CanThrow(ASTContext &C) const; 498 499 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 500 /// its subexpression. If that subexpression is also a ParenExpr, 501 /// then this method recursively returns its subexpression, and so forth. 502 /// Otherwise, the method returns the current Expr. 503 Expr *IgnoreParens(); 504 505 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 506 /// or CastExprs, returning their operand. 507 Expr *IgnoreParenCasts(); 508 509 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 510 /// ParenExpr or ImplicitCastExprs, returning their operand. 511 Expr *IgnoreParenImpCasts(); 512 513 const Expr *IgnoreParenImpCasts() const { 514 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 515 } 516 517 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 518 /// CastExprs that represent lvalue casts, returning their operand. 519 Expr *IgnoreParenLValueCasts(); 520 521 const Expr *IgnoreParenLValueCasts() const { 522 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 523 } 524 525 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 526 /// value (including ptr->int casts of the same size). Strip off any 527 /// ParenExpr or CastExprs, returning their operand. 528 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 529 530 /// \brief Determine whether this expression is a default function argument. 531 /// 532 /// Default arguments are implicitly generated in the abstract syntax tree 533 /// by semantic analysis for function calls, object constructions, etc. in 534 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 535 /// this routine also looks through any implicit casts to determine whether 536 /// the expression is a default argument. 537 bool isDefaultArgument() const; 538 539 /// \brief Determine whether the result of this expression is a 540 /// temporary object of the given class type. 541 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 542 543 /// \brief Whether this expression is an implicit reference to 'this' in C++. 544 bool isImplicitCXXThis() const; 545 546 const Expr *IgnoreParens() const { 547 return const_cast<Expr*>(this)->IgnoreParens(); 548 } 549 const Expr *IgnoreParenCasts() const { 550 return const_cast<Expr*>(this)->IgnoreParenCasts(); 551 } 552 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 553 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 554 } 555 556 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 557 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 558 559 static bool classof(const Stmt *T) { 560 return T->getStmtClass() >= firstExprConstant && 561 T->getStmtClass() <= lastExprConstant; 562 } 563 static bool classof(const Expr *) { return true; } 564}; 565 566 567//===----------------------------------------------------------------------===// 568// Primary Expressions. 569//===----------------------------------------------------------------------===// 570 571/// OpaqueValueExpr - An expression referring to an opaque object of a 572/// fixed type and value class. These don't correspond to concrete 573/// syntax; instead they're used to express operations (usually copy 574/// operations) on values whose source is generally obvious from 575/// context. 576class OpaqueValueExpr : public Expr { 577 friend class ASTStmtReader; 578 Expr *SourceExpr; 579 SourceLocation Loc; 580 581public: 582 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 583 ExprObjectKind OK = OK_Ordinary) 584 : Expr(OpaqueValueExprClass, T, VK, OK, 585 T->isDependentType(), T->isDependentType(), false), 586 SourceExpr(0), Loc(Loc) { 587 } 588 589 /// Given an expression which invokes a copy constructor --- i.e. a 590 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 591 /// find the OpaqueValueExpr that's the source of the construction. 592 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 593 594 explicit OpaqueValueExpr(EmptyShell Empty) 595 : Expr(OpaqueValueExprClass, Empty) { } 596 597 /// \brief Retrieve the location of this expression. 598 SourceLocation getLocation() const { return Loc; } 599 600 SourceRange getSourceRange() const { 601 if (SourceExpr) return SourceExpr->getSourceRange(); 602 return Loc; 603 } 604 SourceLocation getExprLoc() const { 605 if (SourceExpr) return SourceExpr->getExprLoc(); 606 return Loc; 607 } 608 609 child_range children() { return child_range(); } 610 611 /// The source expression of an opaque value expression is the 612 /// expression which originally generated the value. This is 613 /// provided as a convenience for analyses that don't wish to 614 /// precisely model the execution behavior of the program. 615 /// 616 /// The source expression is typically set when building the 617 /// expression which binds the opaque value expression in the first 618 /// place. 619 Expr *getSourceExpr() const { return SourceExpr; } 620 void setSourceExpr(Expr *e) { SourceExpr = e; } 621 622 static bool classof(const Stmt *T) { 623 return T->getStmtClass() == OpaqueValueExprClass; 624 } 625 static bool classof(const OpaqueValueExpr *) { return true; } 626}; 627 628/// \brief Represents the qualifier that may precede a C++ name, e.g., the 629/// "std::" in "std::sort". 630struct NameQualifier { 631 /// \brief The nested-name-specifier that qualifies the name, including 632 /// source-location information. 633 NestedNameSpecifierLoc QualifierLoc; 634}; 635 636/// \brief Represents an explicit template argument list in C++, e.g., 637/// the "<int>" in "sort<int>". 638struct ExplicitTemplateArgumentList { 639 /// \brief The source location of the left angle bracket ('<'); 640 SourceLocation LAngleLoc; 641 642 /// \brief The source location of the right angle bracket ('>'); 643 SourceLocation RAngleLoc; 644 645 /// \brief The number of template arguments in TemplateArgs. 646 /// The actual template arguments (if any) are stored after the 647 /// ExplicitTemplateArgumentList structure. 648 unsigned NumTemplateArgs; 649 650 /// \brief Retrieve the template arguments 651 TemplateArgumentLoc *getTemplateArgs() { 652 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 653 } 654 655 /// \brief Retrieve the template arguments 656 const TemplateArgumentLoc *getTemplateArgs() const { 657 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 658 } 659 660 void initializeFrom(const TemplateArgumentListInfo &List); 661 void initializeFrom(const TemplateArgumentListInfo &List, 662 bool &Dependent, bool &ContainsUnexpandedParameterPack); 663 void copyInto(TemplateArgumentListInfo &List) const; 664 static std::size_t sizeFor(unsigned NumTemplateArgs); 665 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 666}; 667 668/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 669/// enum, etc. 670class DeclRefExpr : public Expr { 671 enum { 672 // Flag on DecoratedD that specifies when this declaration reference 673 // expression has a C++ nested-name-specifier. 674 HasQualifierFlag = 0x01, 675 // Flag on DecoratedD that specifies when this declaration reference 676 // expression has an explicit C++ template argument list. 677 HasExplicitTemplateArgumentListFlag = 0x02 678 }; 679 680 // DecoratedD - The declaration that we are referencing, plus two bits to 681 // indicate whether (1) the declaration's name was explicitly qualified and 682 // (2) the declaration's name was followed by an explicit template 683 // argument list. 684 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 685 686 // Loc - The location of the declaration name itself. 687 SourceLocation Loc; 688 689 /// DNLoc - Provides source/type location info for the 690 /// declaration name embedded in DecoratedD. 691 DeclarationNameLoc DNLoc; 692 693 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 694 NameQualifier *getNameQualifier() { 695 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 696 return 0; 697 698 return reinterpret_cast<NameQualifier *> (this + 1); 699 } 700 701 /// \brief Retrieve the qualifier that preceded the member name, if any. 702 const NameQualifier *getNameQualifier() const { 703 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 704 } 705 706 DeclRefExpr(NestedNameSpecifierLoc QualifierLoc, 707 ValueDecl *D, SourceLocation NameLoc, 708 const TemplateArgumentListInfo *TemplateArgs, 709 QualType T, ExprValueKind VK); 710 711 DeclRefExpr(NestedNameSpecifierLoc QualifierLoc, 712 ValueDecl *D, const DeclarationNameInfo &NameInfo, 713 const TemplateArgumentListInfo *TemplateArgs, 714 QualType T, ExprValueKind VK); 715 716 /// \brief Construct an empty declaration reference expression. 717 explicit DeclRefExpr(EmptyShell Empty) 718 : Expr(DeclRefExprClass, Empty) { } 719 720 /// \brief Computes the type- and value-dependence flags for this 721 /// declaration reference expression. 722 void computeDependence(); 723 724public: 725 DeclRefExpr(ValueDecl *d, QualType t, ExprValueKind VK, SourceLocation l) : 726 Expr(DeclRefExprClass, t, VK, OK_Ordinary, false, false, false), 727 DecoratedD(d, 0), Loc(l) { 728 computeDependence(); 729 } 730 731 static DeclRefExpr *Create(ASTContext &Context, 732 NestedNameSpecifierLoc QualifierLoc, 733 ValueDecl *D, 734 SourceLocation NameLoc, 735 QualType T, ExprValueKind VK, 736 const TemplateArgumentListInfo *TemplateArgs = 0); 737 738 static DeclRefExpr *Create(ASTContext &Context, 739 NestedNameSpecifierLoc QualifierLoc, 740 ValueDecl *D, 741 const DeclarationNameInfo &NameInfo, 742 QualType T, ExprValueKind VK, 743 const TemplateArgumentListInfo *TemplateArgs = 0); 744 745 /// \brief Construct an empty declaration reference expression. 746 static DeclRefExpr *CreateEmpty(ASTContext &Context, 747 bool HasQualifier, 748 bool HasExplicitTemplateArgs, 749 unsigned NumTemplateArgs); 750 751 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 752 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 753 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 754 755 DeclarationNameInfo getNameInfo() const { 756 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 757 } 758 759 SourceLocation getLocation() const { return Loc; } 760 void setLocation(SourceLocation L) { Loc = L; } 761 SourceRange getSourceRange() const; 762 763 /// \brief Determine whether this declaration reference was preceded by a 764 /// C++ nested-name-specifier, e.g., \c N::foo. 765 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 766 767 /// \brief If the name was qualified, retrieves the nested-name-specifier 768 /// that precedes the name. Otherwise, returns NULL. 769 NestedNameSpecifier *getQualifier() const { 770 if (!hasQualifier()) 771 return 0; 772 773 return getNameQualifier()->QualifierLoc.getNestedNameSpecifier(); 774 } 775 776 /// \brief If the name was qualified, retrieves the nested-name-specifier 777 /// that precedes the name, with source-location information. 778 NestedNameSpecifierLoc getQualifierLoc() const { 779 if (!hasQualifier()) 780 return NestedNameSpecifierLoc(); 781 782 return getNameQualifier()->QualifierLoc; 783 } 784 785 bool hasExplicitTemplateArgs() const { 786 return (DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag); 787 } 788 789 /// \brief Retrieve the explicit template argument list that followed the 790 /// member template name. 791 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 792 assert(hasExplicitTemplateArgs()); 793 794 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 795 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 796 797 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 798 getNameQualifier() + 1); 799 } 800 801 /// \brief Retrieve the explicit template argument list that followed the 802 /// member template name. 803 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 804 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 805 } 806 807 /// \brief Retrieves the optional explicit template arguments. 808 /// This points to the same data as getExplicitTemplateArgs(), but 809 /// returns null if there are no explicit template arguments. 810 const ExplicitTemplateArgumentList *getExplicitTemplateArgsOpt() const { 811 if (!hasExplicitTemplateArgs()) return 0; 812 return &getExplicitTemplateArgs(); 813 } 814 815 /// \brief Copies the template arguments (if present) into the given 816 /// structure. 817 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 818 if (hasExplicitTemplateArgs()) 819 getExplicitTemplateArgs().copyInto(List); 820 } 821 822 /// \brief Retrieve the location of the left angle bracket following the 823 /// member name ('<'), if any. 824 SourceLocation getLAngleLoc() const { 825 if (!hasExplicitTemplateArgs()) 826 return SourceLocation(); 827 828 return getExplicitTemplateArgs().LAngleLoc; 829 } 830 831 /// \brief Retrieve the template arguments provided as part of this 832 /// template-id. 833 const TemplateArgumentLoc *getTemplateArgs() const { 834 if (!hasExplicitTemplateArgs()) 835 return 0; 836 837 return getExplicitTemplateArgs().getTemplateArgs(); 838 } 839 840 /// \brief Retrieve the number of template arguments provided as part of this 841 /// template-id. 842 unsigned getNumTemplateArgs() const { 843 if (!hasExplicitTemplateArgs()) 844 return 0; 845 846 return getExplicitTemplateArgs().NumTemplateArgs; 847 } 848 849 /// \brief Retrieve the location of the right angle bracket following the 850 /// template arguments ('>'). 851 SourceLocation getRAngleLoc() const { 852 if (!hasExplicitTemplateArgs()) 853 return SourceLocation(); 854 855 return getExplicitTemplateArgs().RAngleLoc; 856 } 857 858 static bool classof(const Stmt *T) { 859 return T->getStmtClass() == DeclRefExprClass; 860 } 861 static bool classof(const DeclRefExpr *) { return true; } 862 863 // Iterators 864 child_range children() { return child_range(); } 865 866 friend class ASTStmtReader; 867 friend class ASTStmtWriter; 868}; 869 870/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 871class PredefinedExpr : public Expr { 872public: 873 enum IdentType { 874 Func, 875 Function, 876 PrettyFunction, 877 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 878 /// 'virtual' keyword is omitted for virtual member functions. 879 PrettyFunctionNoVirtual 880 }; 881 882private: 883 SourceLocation Loc; 884 IdentType Type; 885public: 886 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 887 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 888 type->isDependentType(), type->isDependentType(), 889 /*ContainsUnexpandedParameterPack=*/false), 890 Loc(l), Type(IT) {} 891 892 /// \brief Construct an empty predefined expression. 893 explicit PredefinedExpr(EmptyShell Empty) 894 : Expr(PredefinedExprClass, Empty) { } 895 896 IdentType getIdentType() const { return Type; } 897 void setIdentType(IdentType IT) { Type = IT; } 898 899 SourceLocation getLocation() const { return Loc; } 900 void setLocation(SourceLocation L) { Loc = L; } 901 902 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 903 904 SourceRange getSourceRange() const { return SourceRange(Loc); } 905 906 static bool classof(const Stmt *T) { 907 return T->getStmtClass() == PredefinedExprClass; 908 } 909 static bool classof(const PredefinedExpr *) { return true; } 910 911 // Iterators 912 child_range children() { return child_range(); } 913}; 914 915/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 916/// leaking memory. 917/// 918/// For large floats/integers, APFloat/APInt will allocate memory from the heap 919/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 920/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 921/// the APFloat/APInt values will never get freed. APNumericStorage uses 922/// ASTContext's allocator for memory allocation. 923class APNumericStorage { 924 unsigned BitWidth; 925 union { 926 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 927 uint64_t *pVal; ///< Used to store the >64 bits integer value. 928 }; 929 930 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 931 932 APNumericStorage(const APNumericStorage&); // do not implement 933 APNumericStorage& operator=(const APNumericStorage&); // do not implement 934 935protected: 936 APNumericStorage() : BitWidth(0), VAL(0) { } 937 938 llvm::APInt getIntValue() const { 939 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 940 if (NumWords > 1) 941 return llvm::APInt(BitWidth, NumWords, pVal); 942 else 943 return llvm::APInt(BitWidth, VAL); 944 } 945 void setIntValue(ASTContext &C, const llvm::APInt &Val); 946}; 947 948class APIntStorage : public APNumericStorage { 949public: 950 llvm::APInt getValue() const { return getIntValue(); } 951 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 952}; 953 954class APFloatStorage : public APNumericStorage { 955public: 956 llvm::APFloat getValue() const { return llvm::APFloat(getIntValue()); } 957 void setValue(ASTContext &C, const llvm::APFloat &Val) { 958 setIntValue(C, Val.bitcastToAPInt()); 959 } 960}; 961 962class IntegerLiteral : public Expr { 963 APIntStorage Num; 964 SourceLocation Loc; 965 966 /// \brief Construct an empty integer literal. 967 explicit IntegerLiteral(EmptyShell Empty) 968 : Expr(IntegerLiteralClass, Empty) { } 969 970public: 971 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 972 // or UnsignedLongLongTy 973 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 974 QualType type, SourceLocation l) 975 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 976 false), 977 Loc(l) { 978 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 979 setValue(C, V); 980 } 981 982 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 983 // or UnsignedLongLongTy 984 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 985 QualType type, SourceLocation l); 986 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 987 988 llvm::APInt getValue() const { return Num.getValue(); } 989 SourceRange getSourceRange() const { return SourceRange(Loc); } 990 991 /// \brief Retrieve the location of the literal. 992 SourceLocation getLocation() const { return Loc; } 993 994 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 995 void setLocation(SourceLocation Location) { Loc = Location; } 996 997 static bool classof(const Stmt *T) { 998 return T->getStmtClass() == IntegerLiteralClass; 999 } 1000 static bool classof(const IntegerLiteral *) { return true; } 1001 1002 // Iterators 1003 child_range children() { return child_range(); } 1004}; 1005 1006class CharacterLiteral : public Expr { 1007 unsigned Value; 1008 SourceLocation Loc; 1009 bool IsWide; 1010public: 1011 // type should be IntTy 1012 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 1013 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 1014 false), 1015 Value(value), Loc(l), IsWide(iswide) { 1016 } 1017 1018 /// \brief Construct an empty character literal. 1019 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1020 1021 SourceLocation getLocation() const { return Loc; } 1022 bool isWide() const { return IsWide; } 1023 1024 SourceRange getSourceRange() const { return SourceRange(Loc); } 1025 1026 unsigned getValue() const { return Value; } 1027 1028 void setLocation(SourceLocation Location) { Loc = Location; } 1029 void setWide(bool W) { IsWide = W; } 1030 void setValue(unsigned Val) { Value = Val; } 1031 1032 static bool classof(const Stmt *T) { 1033 return T->getStmtClass() == CharacterLiteralClass; 1034 } 1035 static bool classof(const CharacterLiteral *) { return true; } 1036 1037 // Iterators 1038 child_range children() { return child_range(); } 1039}; 1040 1041class FloatingLiteral : public Expr { 1042 APFloatStorage Num; 1043 bool IsExact : 1; 1044 SourceLocation Loc; 1045 1046 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1047 QualType Type, SourceLocation L) 1048 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1049 false), 1050 IsExact(isexact), Loc(L) { 1051 setValue(C, V); 1052 } 1053 1054 /// \brief Construct an empty floating-point literal. 1055 explicit FloatingLiteral(EmptyShell Empty) 1056 : Expr(FloatingLiteralClass, Empty), IsExact(false) { } 1057 1058public: 1059 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1060 bool isexact, QualType Type, SourceLocation L); 1061 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1062 1063 llvm::APFloat getValue() const { return Num.getValue(); } 1064 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1065 Num.setValue(C, Val); 1066 } 1067 1068 bool isExact() const { return IsExact; } 1069 void setExact(bool E) { IsExact = E; } 1070 1071 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1072 /// double. Note that this may cause loss of precision, but is useful for 1073 /// debugging dumps, etc. 1074 double getValueAsApproximateDouble() const; 1075 1076 SourceLocation getLocation() const { return Loc; } 1077 void setLocation(SourceLocation L) { Loc = L; } 1078 1079 SourceRange getSourceRange() const { return SourceRange(Loc); } 1080 1081 static bool classof(const Stmt *T) { 1082 return T->getStmtClass() == FloatingLiteralClass; 1083 } 1084 static bool classof(const FloatingLiteral *) { return true; } 1085 1086 // Iterators 1087 child_range children() { return child_range(); } 1088}; 1089 1090/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1091/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1092/// IntegerLiteral classes. Instances of this class always have a Complex type 1093/// whose element type matches the subexpression. 1094/// 1095class ImaginaryLiteral : public Expr { 1096 Stmt *Val; 1097public: 1098 ImaginaryLiteral(Expr *val, QualType Ty) 1099 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1100 false), 1101 Val(val) {} 1102 1103 /// \brief Build an empty imaginary literal. 1104 explicit ImaginaryLiteral(EmptyShell Empty) 1105 : Expr(ImaginaryLiteralClass, Empty) { } 1106 1107 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1108 Expr *getSubExpr() { return cast<Expr>(Val); } 1109 void setSubExpr(Expr *E) { Val = E; } 1110 1111 SourceRange getSourceRange() const { return Val->getSourceRange(); } 1112 static bool classof(const Stmt *T) { 1113 return T->getStmtClass() == ImaginaryLiteralClass; 1114 } 1115 static bool classof(const ImaginaryLiteral *) { return true; } 1116 1117 // Iterators 1118 child_range children() { return child_range(&Val, &Val+1); } 1119}; 1120 1121/// StringLiteral - This represents a string literal expression, e.g. "foo" 1122/// or L"bar" (wide strings). The actual string is returned by getStrData() 1123/// is NOT null-terminated, and the length of the string is determined by 1124/// calling getByteLength(). The C type for a string is always a 1125/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1126/// not. 1127/// 1128/// Note that strings in C can be formed by concatenation of multiple string 1129/// literal pptokens in translation phase #6. This keeps track of the locations 1130/// of each of these pieces. 1131/// 1132/// Strings in C can also be truncated and extended by assigning into arrays, 1133/// e.g. with constructs like: 1134/// char X[2] = "foobar"; 1135/// In this case, getByteLength() will return 6, but the string literal will 1136/// have type "char[2]". 1137class StringLiteral : public Expr { 1138 friend class ASTStmtReader; 1139 1140 const char *StrData; 1141 unsigned ByteLength; 1142 bool IsWide; 1143 bool IsPascal; 1144 unsigned NumConcatenated; 1145 SourceLocation TokLocs[1]; 1146 1147 StringLiteral(QualType Ty) : 1148 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false) {} 1149 1150public: 1151 /// This is the "fully general" constructor that allows representation of 1152 /// strings formed from multiple concatenated tokens. 1153 static StringLiteral *Create(ASTContext &C, const char *StrData, 1154 unsigned ByteLength, bool Wide, bool Pascal, 1155 QualType Ty, 1156 const SourceLocation *Loc, unsigned NumStrs); 1157 1158 /// Simple constructor for string literals made from one token. 1159 static StringLiteral *Create(ASTContext &C, const char *StrData, 1160 unsigned ByteLength, bool Wide, 1161 bool Pascal, QualType Ty, SourceLocation Loc) { 1162 return Create(C, StrData, ByteLength, Wide, Pascal, Ty, &Loc, 1); 1163 } 1164 1165 /// \brief Construct an empty string literal. 1166 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1167 1168 llvm::StringRef getString() const { 1169 return llvm::StringRef(StrData, ByteLength); 1170 } 1171 1172 unsigned getByteLength() const { return ByteLength; } 1173 1174 /// \brief Sets the string data to the given string data. 1175 void setString(ASTContext &C, llvm::StringRef Str); 1176 1177 bool isWide() const { return IsWide; } 1178 bool isPascal() const { return IsPascal; } 1179 1180 bool containsNonAsciiOrNull() const { 1181 llvm::StringRef Str = getString(); 1182 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1183 if (!isascii(Str[i]) || !Str[i]) 1184 return true; 1185 return false; 1186 } 1187 /// getNumConcatenated - Get the number of string literal tokens that were 1188 /// concatenated in translation phase #6 to form this string literal. 1189 unsigned getNumConcatenated() const { return NumConcatenated; } 1190 1191 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1192 assert(TokNum < NumConcatenated && "Invalid tok number"); 1193 return TokLocs[TokNum]; 1194 } 1195 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1196 assert(TokNum < NumConcatenated && "Invalid tok number"); 1197 TokLocs[TokNum] = L; 1198 } 1199 1200 /// getLocationOfByte - Return a source location that points to the specified 1201 /// byte of this string literal. 1202 /// 1203 /// Strings are amazingly complex. They can be formed from multiple tokens 1204 /// and can have escape sequences in them in addition to the usual trigraph 1205 /// and escaped newline business. This routine handles this complexity. 1206 /// 1207 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1208 const LangOptions &Features, 1209 const TargetInfo &Target) const; 1210 1211 typedef const SourceLocation *tokloc_iterator; 1212 tokloc_iterator tokloc_begin() const { return TokLocs; } 1213 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1214 1215 SourceRange getSourceRange() const { 1216 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1217 } 1218 static bool classof(const Stmt *T) { 1219 return T->getStmtClass() == StringLiteralClass; 1220 } 1221 static bool classof(const StringLiteral *) { return true; } 1222 1223 // Iterators 1224 child_range children() { return child_range(); } 1225}; 1226 1227/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1228/// AST node is only formed if full location information is requested. 1229class ParenExpr : public Expr { 1230 SourceLocation L, R; 1231 Stmt *Val; 1232public: 1233 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1234 : Expr(ParenExprClass, val->getType(), 1235 val->getValueKind(), val->getObjectKind(), 1236 val->isTypeDependent(), val->isValueDependent(), 1237 val->containsUnexpandedParameterPack()), 1238 L(l), R(r), Val(val) {} 1239 1240 /// \brief Construct an empty parenthesized expression. 1241 explicit ParenExpr(EmptyShell Empty) 1242 : Expr(ParenExprClass, Empty) { } 1243 1244 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1245 Expr *getSubExpr() { return cast<Expr>(Val); } 1246 void setSubExpr(Expr *E) { Val = E; } 1247 1248 SourceRange getSourceRange() const { return SourceRange(L, R); } 1249 1250 /// \brief Get the location of the left parentheses '('. 1251 SourceLocation getLParen() const { return L; } 1252 void setLParen(SourceLocation Loc) { L = Loc; } 1253 1254 /// \brief Get the location of the right parentheses ')'. 1255 SourceLocation getRParen() const { return R; } 1256 void setRParen(SourceLocation Loc) { R = Loc; } 1257 1258 static bool classof(const Stmt *T) { 1259 return T->getStmtClass() == ParenExprClass; 1260 } 1261 static bool classof(const ParenExpr *) { return true; } 1262 1263 // Iterators 1264 child_range children() { return child_range(&Val, &Val+1); } 1265}; 1266 1267 1268/// UnaryOperator - This represents the unary-expression's (except sizeof and 1269/// alignof), the postinc/postdec operators from postfix-expression, and various 1270/// extensions. 1271/// 1272/// Notes on various nodes: 1273/// 1274/// Real/Imag - These return the real/imag part of a complex operand. If 1275/// applied to a non-complex value, the former returns its operand and the 1276/// later returns zero in the type of the operand. 1277/// 1278class UnaryOperator : public Expr { 1279public: 1280 typedef UnaryOperatorKind Opcode; 1281 1282private: 1283 unsigned Opc : 5; 1284 SourceLocation Loc; 1285 Stmt *Val; 1286public: 1287 1288 UnaryOperator(Expr *input, Opcode opc, QualType type, 1289 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1290 : Expr(UnaryOperatorClass, type, VK, OK, 1291 input->isTypeDependent() || type->isDependentType(), 1292 input->isValueDependent(), 1293 input->containsUnexpandedParameterPack()), 1294 Opc(opc), Loc(l), Val(input) {} 1295 1296 /// \brief Build an empty unary operator. 1297 explicit UnaryOperator(EmptyShell Empty) 1298 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1299 1300 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1301 void setOpcode(Opcode O) { Opc = O; } 1302 1303 Expr *getSubExpr() const { return cast<Expr>(Val); } 1304 void setSubExpr(Expr *E) { Val = E; } 1305 1306 /// getOperatorLoc - Return the location of the operator. 1307 SourceLocation getOperatorLoc() const { return Loc; } 1308 void setOperatorLoc(SourceLocation L) { Loc = L; } 1309 1310 /// isPostfix - Return true if this is a postfix operation, like x++. 1311 static bool isPostfix(Opcode Op) { 1312 return Op == UO_PostInc || Op == UO_PostDec; 1313 } 1314 1315 /// isPrefix - Return true if this is a prefix operation, like --x. 1316 static bool isPrefix(Opcode Op) { 1317 return Op == UO_PreInc || Op == UO_PreDec; 1318 } 1319 1320 bool isPrefix() const { return isPrefix(getOpcode()); } 1321 bool isPostfix() const { return isPostfix(getOpcode()); } 1322 bool isIncrementOp() const { 1323 return Opc == UO_PreInc || Opc == UO_PostInc; 1324 } 1325 bool isIncrementDecrementOp() const { 1326 return Opc <= UO_PreDec; 1327 } 1328 static bool isArithmeticOp(Opcode Op) { 1329 return Op >= UO_Plus && Op <= UO_LNot; 1330 } 1331 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1332 1333 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1334 /// corresponds to, e.g. "sizeof" or "[pre]++" 1335 static const char *getOpcodeStr(Opcode Op); 1336 1337 /// \brief Retrieve the unary opcode that corresponds to the given 1338 /// overloaded operator. 1339 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1340 1341 /// \brief Retrieve the overloaded operator kind that corresponds to 1342 /// the given unary opcode. 1343 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1344 1345 SourceRange getSourceRange() const { 1346 if (isPostfix()) 1347 return SourceRange(Val->getLocStart(), Loc); 1348 else 1349 return SourceRange(Loc, Val->getLocEnd()); 1350 } 1351 SourceLocation getExprLoc() const { return Loc; } 1352 1353 static bool classof(const Stmt *T) { 1354 return T->getStmtClass() == UnaryOperatorClass; 1355 } 1356 static bool classof(const UnaryOperator *) { return true; } 1357 1358 // Iterators 1359 child_range children() { return child_range(&Val, &Val+1); } 1360}; 1361 1362/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1363/// offsetof(record-type, member-designator). For example, given: 1364/// @code 1365/// struct S { 1366/// float f; 1367/// double d; 1368/// }; 1369/// struct T { 1370/// int i; 1371/// struct S s[10]; 1372/// }; 1373/// @endcode 1374/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1375 1376class OffsetOfExpr : public Expr { 1377public: 1378 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1379 class OffsetOfNode { 1380 public: 1381 /// \brief The kind of offsetof node we have. 1382 enum Kind { 1383 /// \brief An index into an array. 1384 Array = 0x00, 1385 /// \brief A field. 1386 Field = 0x01, 1387 /// \brief A field in a dependent type, known only by its name. 1388 Identifier = 0x02, 1389 /// \brief An implicit indirection through a C++ base class, when the 1390 /// field found is in a base class. 1391 Base = 0x03 1392 }; 1393 1394 private: 1395 enum { MaskBits = 2, Mask = 0x03 }; 1396 1397 /// \brief The source range that covers this part of the designator. 1398 SourceRange Range; 1399 1400 /// \brief The data describing the designator, which comes in three 1401 /// different forms, depending on the lower two bits. 1402 /// - An unsigned index into the array of Expr*'s stored after this node 1403 /// in memory, for [constant-expression] designators. 1404 /// - A FieldDecl*, for references to a known field. 1405 /// - An IdentifierInfo*, for references to a field with a given name 1406 /// when the class type is dependent. 1407 /// - A CXXBaseSpecifier*, for references that look at a field in a 1408 /// base class. 1409 uintptr_t Data; 1410 1411 public: 1412 /// \brief Create an offsetof node that refers to an array element. 1413 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1414 SourceLocation RBracketLoc) 1415 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1416 1417 /// \brief Create an offsetof node that refers to a field. 1418 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1419 SourceLocation NameLoc) 1420 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1421 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1422 1423 /// \brief Create an offsetof node that refers to an identifier. 1424 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1425 SourceLocation NameLoc) 1426 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1427 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1428 1429 /// \brief Create an offsetof node that refers into a C++ base class. 1430 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1431 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1432 1433 /// \brief Determine what kind of offsetof node this is. 1434 Kind getKind() const { 1435 return static_cast<Kind>(Data & Mask); 1436 } 1437 1438 /// \brief For an array element node, returns the index into the array 1439 /// of expressions. 1440 unsigned getArrayExprIndex() const { 1441 assert(getKind() == Array); 1442 return Data >> 2; 1443 } 1444 1445 /// \brief For a field offsetof node, returns the field. 1446 FieldDecl *getField() const { 1447 assert(getKind() == Field); 1448 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1449 } 1450 1451 /// \brief For a field or identifier offsetof node, returns the name of 1452 /// the field. 1453 IdentifierInfo *getFieldName() const; 1454 1455 /// \brief For a base class node, returns the base specifier. 1456 CXXBaseSpecifier *getBase() const { 1457 assert(getKind() == Base); 1458 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1459 } 1460 1461 /// \brief Retrieve the source range that covers this offsetof node. 1462 /// 1463 /// For an array element node, the source range contains the locations of 1464 /// the square brackets. For a field or identifier node, the source range 1465 /// contains the location of the period (if there is one) and the 1466 /// identifier. 1467 SourceRange getSourceRange() const { return Range; } 1468 }; 1469 1470private: 1471 1472 SourceLocation OperatorLoc, RParenLoc; 1473 // Base type; 1474 TypeSourceInfo *TSInfo; 1475 // Number of sub-components (i.e. instances of OffsetOfNode). 1476 unsigned NumComps; 1477 // Number of sub-expressions (i.e. array subscript expressions). 1478 unsigned NumExprs; 1479 1480 OffsetOfExpr(ASTContext &C, QualType type, 1481 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1482 OffsetOfNode* compsPtr, unsigned numComps, 1483 Expr** exprsPtr, unsigned numExprs, 1484 SourceLocation RParenLoc); 1485 1486 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1487 : Expr(OffsetOfExprClass, EmptyShell()), 1488 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1489 1490public: 1491 1492 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1493 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1494 OffsetOfNode* compsPtr, unsigned numComps, 1495 Expr** exprsPtr, unsigned numExprs, 1496 SourceLocation RParenLoc); 1497 1498 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1499 unsigned NumComps, unsigned NumExprs); 1500 1501 /// getOperatorLoc - Return the location of the operator. 1502 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1503 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1504 1505 /// \brief Return the location of the right parentheses. 1506 SourceLocation getRParenLoc() const { return RParenLoc; } 1507 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1508 1509 TypeSourceInfo *getTypeSourceInfo() const { 1510 return TSInfo; 1511 } 1512 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1513 TSInfo = tsi; 1514 } 1515 1516 const OffsetOfNode &getComponent(unsigned Idx) { 1517 assert(Idx < NumComps && "Subscript out of range"); 1518 return reinterpret_cast<OffsetOfNode *> (this + 1)[Idx]; 1519 } 1520 1521 void setComponent(unsigned Idx, OffsetOfNode ON) { 1522 assert(Idx < NumComps && "Subscript out of range"); 1523 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1524 } 1525 1526 unsigned getNumComponents() const { 1527 return NumComps; 1528 } 1529 1530 Expr* getIndexExpr(unsigned Idx) { 1531 assert(Idx < NumExprs && "Subscript out of range"); 1532 return reinterpret_cast<Expr **>( 1533 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1534 } 1535 1536 void setIndexExpr(unsigned Idx, Expr* E) { 1537 assert(Idx < NumComps && "Subscript out of range"); 1538 reinterpret_cast<Expr **>( 1539 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1540 } 1541 1542 unsigned getNumExpressions() const { 1543 return NumExprs; 1544 } 1545 1546 SourceRange getSourceRange() const { 1547 return SourceRange(OperatorLoc, RParenLoc); 1548 } 1549 1550 static bool classof(const Stmt *T) { 1551 return T->getStmtClass() == OffsetOfExprClass; 1552 } 1553 1554 static bool classof(const OffsetOfExpr *) { return true; } 1555 1556 // Iterators 1557 child_range children() { 1558 Stmt **begin = 1559 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1560 + NumComps); 1561 return child_range(begin, begin + NumExprs); 1562 } 1563}; 1564 1565/// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated) 1566/// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and 1567/// vec_step (OpenCL 1.1 6.11.12). 1568class UnaryExprOrTypeTraitExpr : public Expr { 1569 unsigned Kind : 2; 1570 bool isType : 1; // true if operand is a type, false if an expression 1571 union { 1572 TypeSourceInfo *Ty; 1573 Stmt *Ex; 1574 } Argument; 1575 SourceLocation OpLoc, RParenLoc; 1576 1577public: 1578 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo, 1579 QualType resultType, SourceLocation op, 1580 SourceLocation rp) : 1581 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1582 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1583 // Value-dependent if the argument is type-dependent. 1584 TInfo->getType()->isDependentType(), 1585 TInfo->getType()->containsUnexpandedParameterPack()), 1586 Kind(ExprKind), isType(true), OpLoc(op), RParenLoc(rp) { 1587 Argument.Ty = TInfo; 1588 } 1589 1590 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E, 1591 QualType resultType, SourceLocation op, 1592 SourceLocation rp) : 1593 Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary, 1594 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1595 // Value-dependent if the argument is type-dependent. 1596 E->isTypeDependent(), 1597 E->containsUnexpandedParameterPack()), 1598 Kind(ExprKind), isType(false), OpLoc(op), RParenLoc(rp) { 1599 Argument.Ex = E; 1600 } 1601 1602 /// \brief Construct an empty sizeof/alignof expression. 1603 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty) 1604 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { } 1605 1606 UnaryExprOrTypeTrait getKind() const { 1607 return static_cast<UnaryExprOrTypeTrait>(Kind); 1608 } 1609 void setKind(UnaryExprOrTypeTrait K) { Kind = K; } 1610 1611 bool isArgumentType() const { return isType; } 1612 QualType getArgumentType() const { 1613 return getArgumentTypeInfo()->getType(); 1614 } 1615 TypeSourceInfo *getArgumentTypeInfo() const { 1616 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1617 return Argument.Ty; 1618 } 1619 Expr *getArgumentExpr() { 1620 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1621 return static_cast<Expr*>(Argument.Ex); 1622 } 1623 const Expr *getArgumentExpr() const { 1624 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr(); 1625 } 1626 1627 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1628 void setArgument(TypeSourceInfo *TInfo) { 1629 Argument.Ty = TInfo; 1630 isType = true; 1631 } 1632 1633 /// Gets the argument type, or the type of the argument expression, whichever 1634 /// is appropriate. 1635 QualType getTypeOfArgument() const { 1636 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1637 } 1638 1639 SourceLocation getOperatorLoc() const { return OpLoc; } 1640 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1641 1642 SourceLocation getRParenLoc() const { return RParenLoc; } 1643 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1644 1645 SourceRange getSourceRange() const { 1646 return SourceRange(OpLoc, RParenLoc); 1647 } 1648 1649 static bool classof(const Stmt *T) { 1650 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass; 1651 } 1652 static bool classof(const UnaryExprOrTypeTraitExpr *) { return true; } 1653 1654 // Iterators 1655 child_range children(); 1656}; 1657 1658//===----------------------------------------------------------------------===// 1659// Postfix Operators. 1660//===----------------------------------------------------------------------===// 1661 1662/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1663class ArraySubscriptExpr : public Expr { 1664 enum { LHS, RHS, END_EXPR=2 }; 1665 Stmt* SubExprs[END_EXPR]; 1666 SourceLocation RBracketLoc; 1667public: 1668 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1669 ExprValueKind VK, ExprObjectKind OK, 1670 SourceLocation rbracketloc) 1671 : Expr(ArraySubscriptExprClass, t, VK, OK, 1672 lhs->isTypeDependent() || rhs->isTypeDependent(), 1673 lhs->isValueDependent() || rhs->isValueDependent(), 1674 (lhs->containsUnexpandedParameterPack() || 1675 rhs->containsUnexpandedParameterPack())), 1676 RBracketLoc(rbracketloc) { 1677 SubExprs[LHS] = lhs; 1678 SubExprs[RHS] = rhs; 1679 } 1680 1681 /// \brief Create an empty array subscript expression. 1682 explicit ArraySubscriptExpr(EmptyShell Shell) 1683 : Expr(ArraySubscriptExprClass, Shell) { } 1684 1685 /// An array access can be written A[4] or 4[A] (both are equivalent). 1686 /// - getBase() and getIdx() always present the normalized view: A[4]. 1687 /// In this case getBase() returns "A" and getIdx() returns "4". 1688 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1689 /// 4[A] getLHS() returns "4". 1690 /// Note: Because vector element access is also written A[4] we must 1691 /// predicate the format conversion in getBase and getIdx only on the 1692 /// the type of the RHS, as it is possible for the LHS to be a vector of 1693 /// integer type 1694 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1695 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1696 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1697 1698 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1699 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1700 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1701 1702 Expr *getBase() { 1703 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1704 } 1705 1706 const Expr *getBase() const { 1707 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1708 } 1709 1710 Expr *getIdx() { 1711 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1712 } 1713 1714 const Expr *getIdx() const { 1715 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1716 } 1717 1718 SourceRange getSourceRange() const { 1719 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1720 } 1721 1722 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1723 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1724 1725 SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1726 1727 static bool classof(const Stmt *T) { 1728 return T->getStmtClass() == ArraySubscriptExprClass; 1729 } 1730 static bool classof(const ArraySubscriptExpr *) { return true; } 1731 1732 // Iterators 1733 child_range children() { 1734 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 1735 } 1736}; 1737 1738 1739/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1740/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1741/// while its subclasses may represent alternative syntax that (semantically) 1742/// results in a function call. For example, CXXOperatorCallExpr is 1743/// a subclass for overloaded operator calls that use operator syntax, e.g., 1744/// "str1 + str2" to resolve to a function call. 1745class CallExpr : public Expr { 1746 enum { FN=0, PREARGS_START=1 }; 1747 Stmt **SubExprs; 1748 unsigned NumArgs; 1749 SourceLocation RParenLoc; 1750 1751protected: 1752 // These versions of the constructor are for derived classes. 1753 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 1754 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 1755 SourceLocation rparenloc); 1756 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 1757 1758 Stmt *getPreArg(unsigned i) { 1759 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1760 return SubExprs[PREARGS_START+i]; 1761 } 1762 const Stmt *getPreArg(unsigned i) const { 1763 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1764 return SubExprs[PREARGS_START+i]; 1765 } 1766 void setPreArg(unsigned i, Stmt *PreArg) { 1767 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1768 SubExprs[PREARGS_START+i] = PreArg; 1769 } 1770 1771 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 1772 1773public: 1774 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1775 ExprValueKind VK, SourceLocation rparenloc); 1776 1777 /// \brief Build an empty call expression. 1778 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1779 1780 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1781 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1782 void setCallee(Expr *F) { SubExprs[FN] = F; } 1783 1784 Decl *getCalleeDecl(); 1785 const Decl *getCalleeDecl() const { 1786 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1787 } 1788 1789 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1790 FunctionDecl *getDirectCallee(); 1791 const FunctionDecl *getDirectCallee() const { 1792 return const_cast<CallExpr*>(this)->getDirectCallee(); 1793 } 1794 1795 /// getNumArgs - Return the number of actual arguments to this call. 1796 /// 1797 unsigned getNumArgs() const { return NumArgs; } 1798 1799 /// \brief Retrieve the call arguments. 1800 Expr **getArgs() { 1801 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 1802 } 1803 1804 /// getArg - Return the specified argument. 1805 Expr *getArg(unsigned Arg) { 1806 assert(Arg < NumArgs && "Arg access out of range!"); 1807 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1808 } 1809 const Expr *getArg(unsigned Arg) const { 1810 assert(Arg < NumArgs && "Arg access out of range!"); 1811 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1812 } 1813 1814 /// setArg - Set the specified argument. 1815 void setArg(unsigned Arg, Expr *ArgExpr) { 1816 assert(Arg < NumArgs && "Arg access out of range!"); 1817 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 1818 } 1819 1820 /// setNumArgs - This changes the number of arguments present in this call. 1821 /// Any orphaned expressions are deleted by this, and any new operands are set 1822 /// to null. 1823 void setNumArgs(ASTContext& C, unsigned NumArgs); 1824 1825 typedef ExprIterator arg_iterator; 1826 typedef ConstExprIterator const_arg_iterator; 1827 1828 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 1829 arg_iterator arg_end() { 1830 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1831 } 1832 const_arg_iterator arg_begin() const { 1833 return SubExprs+PREARGS_START+getNumPreArgs(); 1834 } 1835 const_arg_iterator arg_end() const { 1836 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1837 } 1838 1839 /// getNumCommas - Return the number of commas that must have been present in 1840 /// this function call. 1841 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1842 1843 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1844 /// not, return 0. 1845 unsigned isBuiltinCall(const ASTContext &Context) const; 1846 1847 /// getCallReturnType - Get the return type of the call expr. This is not 1848 /// always the type of the expr itself, if the return type is a reference 1849 /// type. 1850 QualType getCallReturnType() const; 1851 1852 SourceLocation getRParenLoc() const { return RParenLoc; } 1853 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1854 1855 SourceRange getSourceRange() const; 1856 1857 static bool classof(const Stmt *T) { 1858 return T->getStmtClass() >= firstCallExprConstant && 1859 T->getStmtClass() <= lastCallExprConstant; 1860 } 1861 static bool classof(const CallExpr *) { return true; } 1862 1863 // Iterators 1864 child_range children() { 1865 return child_range(&SubExprs[0], 1866 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 1867 } 1868}; 1869 1870/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1871/// 1872class MemberExpr : public Expr { 1873 /// Extra data stored in some member expressions. 1874 struct MemberNameQualifier : public NameQualifier { 1875 DeclAccessPair FoundDecl; 1876 }; 1877 1878 /// Base - the expression for the base pointer or structure references. In 1879 /// X.F, this is "X". 1880 Stmt *Base; 1881 1882 /// MemberDecl - This is the decl being referenced by the field/member name. 1883 /// In X.F, this is the decl referenced by F. 1884 ValueDecl *MemberDecl; 1885 1886 /// MemberLoc - This is the location of the member name. 1887 SourceLocation MemberLoc; 1888 1889 /// MemberDNLoc - Provides source/type location info for the 1890 /// declaration name embedded in MemberDecl. 1891 DeclarationNameLoc MemberDNLoc; 1892 1893 /// IsArrow - True if this is "X->F", false if this is "X.F". 1894 bool IsArrow : 1; 1895 1896 /// \brief True if this member expression used a nested-name-specifier to 1897 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1898 /// declaration. When true, a MemberNameQualifier 1899 /// structure is allocated immediately after the MemberExpr. 1900 bool HasQualifierOrFoundDecl : 1; 1901 1902 /// \brief True if this member expression specified a template argument list 1903 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1904 /// structure (and its TemplateArguments) are allocated immediately after 1905 /// the MemberExpr or, if the member expression also has a qualifier, after 1906 /// the MemberNameQualifier structure. 1907 bool HasExplicitTemplateArgumentList : 1; 1908 1909 /// \brief Retrieve the qualifier that preceded the member name, if any. 1910 MemberNameQualifier *getMemberQualifier() { 1911 assert(HasQualifierOrFoundDecl); 1912 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1913 } 1914 1915 /// \brief Retrieve the qualifier that preceded the member name, if any. 1916 const MemberNameQualifier *getMemberQualifier() const { 1917 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1918 } 1919 1920public: 1921 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1922 const DeclarationNameInfo &NameInfo, QualType ty, 1923 ExprValueKind VK, ExprObjectKind OK) 1924 : Expr(MemberExprClass, ty, VK, OK, 1925 base->isTypeDependent(), base->isValueDependent(), 1926 base->containsUnexpandedParameterPack()), 1927 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 1928 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 1929 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) { 1930 assert(memberdecl->getDeclName() == NameInfo.getName()); 1931 } 1932 1933 // NOTE: this constructor should be used only when it is known that 1934 // the member name can not provide additional syntactic info 1935 // (i.e., source locations for C++ operator names or type source info 1936 // for constructors, destructors and conversion oeprators). 1937 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1938 SourceLocation l, QualType ty, 1939 ExprValueKind VK, ExprObjectKind OK) 1940 : Expr(MemberExprClass, ty, VK, OK, 1941 base->isTypeDependent(), base->isValueDependent(), 1942 base->containsUnexpandedParameterPack()), 1943 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 1944 IsArrow(isarrow), 1945 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1946 1947 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1948 NestedNameSpecifierLoc QualifierLoc, 1949 ValueDecl *memberdecl, DeclAccessPair founddecl, 1950 DeclarationNameInfo MemberNameInfo, 1951 const TemplateArgumentListInfo *targs, 1952 QualType ty, ExprValueKind VK, ExprObjectKind OK); 1953 1954 void setBase(Expr *E) { Base = E; } 1955 Expr *getBase() const { return cast<Expr>(Base); } 1956 1957 /// \brief Retrieve the member declaration to which this expression refers. 1958 /// 1959 /// The returned declaration will either be a FieldDecl or (in C++) 1960 /// a CXXMethodDecl. 1961 ValueDecl *getMemberDecl() const { return MemberDecl; } 1962 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1963 1964 /// \brief Retrieves the declaration found by lookup. 1965 DeclAccessPair getFoundDecl() const { 1966 if (!HasQualifierOrFoundDecl) 1967 return DeclAccessPair::make(getMemberDecl(), 1968 getMemberDecl()->getAccess()); 1969 return getMemberQualifier()->FoundDecl; 1970 } 1971 1972 /// \brief Determines whether this member expression actually had 1973 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1974 /// x->Base::foo. 1975 bool hasQualifier() const { return getQualifier() != 0; } 1976 1977 /// \brief If the member name was qualified, retrieves the 1978 /// nested-name-specifier that precedes the member name. Otherwise, returns 1979 /// NULL. 1980 NestedNameSpecifier *getQualifier() const { 1981 if (!HasQualifierOrFoundDecl) 1982 return 0; 1983 1984 return getMemberQualifier()->QualifierLoc.getNestedNameSpecifier(); 1985 } 1986 1987 /// \brief If the member name was qualified, retrieves the 1988 /// nested-name-specifier that precedes the member name, with source-location 1989 /// information. 1990 NestedNameSpecifierLoc getQualifierLoc() const { 1991 if (!hasQualifier()) 1992 return NestedNameSpecifierLoc(); 1993 1994 return getMemberQualifier()->QualifierLoc; 1995 } 1996 1997 /// \brief Determines whether this member expression actually had a C++ 1998 /// template argument list explicitly specified, e.g., x.f<int>. 1999 bool hasExplicitTemplateArgs() const { 2000 return HasExplicitTemplateArgumentList; 2001 } 2002 2003 /// \brief Copies the template arguments (if present) into the given 2004 /// structure. 2005 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 2006 if (hasExplicitTemplateArgs()) 2007 getExplicitTemplateArgs().copyInto(List); 2008 } 2009 2010 /// \brief Retrieve the explicit template argument list that 2011 /// follow the member template name. This must only be called on an 2012 /// expression with explicit template arguments. 2013 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 2014 assert(HasExplicitTemplateArgumentList); 2015 if (!HasQualifierOrFoundDecl) 2016 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 2017 2018 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 2019 getMemberQualifier() + 1); 2020 } 2021 2022 /// \brief Retrieve the explicit template argument list that 2023 /// followed the member template name. This must only be called on 2024 /// an expression with explicit template arguments. 2025 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 2026 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2027 } 2028 2029 /// \brief Retrieves the optional explicit template arguments. 2030 /// This points to the same data as getExplicitTemplateArgs(), but 2031 /// returns null if there are no explicit template arguments. 2032 const ExplicitTemplateArgumentList *getOptionalExplicitTemplateArgs() const { 2033 if (!hasExplicitTemplateArgs()) return 0; 2034 return &getExplicitTemplateArgs(); 2035 } 2036 2037 /// \brief Retrieve the location of the left angle bracket following the 2038 /// member name ('<'), if any. 2039 SourceLocation getLAngleLoc() const { 2040 if (!HasExplicitTemplateArgumentList) 2041 return SourceLocation(); 2042 2043 return getExplicitTemplateArgs().LAngleLoc; 2044 } 2045 2046 /// \brief Retrieve the template arguments provided as part of this 2047 /// template-id. 2048 const TemplateArgumentLoc *getTemplateArgs() const { 2049 if (!HasExplicitTemplateArgumentList) 2050 return 0; 2051 2052 return getExplicitTemplateArgs().getTemplateArgs(); 2053 } 2054 2055 /// \brief Retrieve the number of template arguments provided as part of this 2056 /// template-id. 2057 unsigned getNumTemplateArgs() const { 2058 if (!HasExplicitTemplateArgumentList) 2059 return 0; 2060 2061 return getExplicitTemplateArgs().NumTemplateArgs; 2062 } 2063 2064 /// \brief Retrieve the location of the right angle bracket following the 2065 /// template arguments ('>'). 2066 SourceLocation getRAngleLoc() const { 2067 if (!HasExplicitTemplateArgumentList) 2068 return SourceLocation(); 2069 2070 return getExplicitTemplateArgs().RAngleLoc; 2071 } 2072 2073 /// \brief Retrieve the member declaration name info. 2074 DeclarationNameInfo getMemberNameInfo() const { 2075 return DeclarationNameInfo(MemberDecl->getDeclName(), 2076 MemberLoc, MemberDNLoc); 2077 } 2078 2079 bool isArrow() const { return IsArrow; } 2080 void setArrow(bool A) { IsArrow = A; } 2081 2082 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2083 /// location of 'F'. 2084 SourceLocation getMemberLoc() const { return MemberLoc; } 2085 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2086 2087 SourceRange getSourceRange() const; 2088 2089 SourceLocation getExprLoc() const { return MemberLoc; } 2090 2091 /// \brief Determine whether the base of this explicit is implicit. 2092 bool isImplicitAccess() const { 2093 return getBase() && getBase()->isImplicitCXXThis(); 2094 } 2095 2096 static bool classof(const Stmt *T) { 2097 return T->getStmtClass() == MemberExprClass; 2098 } 2099 static bool classof(const MemberExpr *) { return true; } 2100 2101 // Iterators 2102 child_range children() { return child_range(&Base, &Base+1); } 2103 2104 friend class ASTReader; 2105 friend class ASTStmtWriter; 2106}; 2107 2108/// CompoundLiteralExpr - [C99 6.5.2.5] 2109/// 2110class CompoundLiteralExpr : public Expr { 2111 /// LParenLoc - If non-null, this is the location of the left paren in a 2112 /// compound literal like "(int){4}". This can be null if this is a 2113 /// synthesized compound expression. 2114 SourceLocation LParenLoc; 2115 2116 /// The type as written. This can be an incomplete array type, in 2117 /// which case the actual expression type will be different. 2118 TypeSourceInfo *TInfo; 2119 Stmt *Init; 2120 bool FileScope; 2121public: 2122 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2123 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2124 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2125 tinfo->getType()->isDependentType(), 2126 init->isValueDependent(), 2127 init->containsUnexpandedParameterPack()), 2128 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2129 2130 /// \brief Construct an empty compound literal. 2131 explicit CompoundLiteralExpr(EmptyShell Empty) 2132 : Expr(CompoundLiteralExprClass, Empty) { } 2133 2134 const Expr *getInitializer() const { return cast<Expr>(Init); } 2135 Expr *getInitializer() { return cast<Expr>(Init); } 2136 void setInitializer(Expr *E) { Init = E; } 2137 2138 bool isFileScope() const { return FileScope; } 2139 void setFileScope(bool FS) { FileScope = FS; } 2140 2141 SourceLocation getLParenLoc() const { return LParenLoc; } 2142 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2143 2144 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2145 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2146 2147 SourceRange getSourceRange() const { 2148 // FIXME: Init should never be null. 2149 if (!Init) 2150 return SourceRange(); 2151 if (LParenLoc.isInvalid()) 2152 return Init->getSourceRange(); 2153 return SourceRange(LParenLoc, Init->getLocEnd()); 2154 } 2155 2156 static bool classof(const Stmt *T) { 2157 return T->getStmtClass() == CompoundLiteralExprClass; 2158 } 2159 static bool classof(const CompoundLiteralExpr *) { return true; } 2160 2161 // Iterators 2162 child_range children() { return child_range(&Init, &Init+1); } 2163}; 2164 2165/// CastExpr - Base class for type casts, including both implicit 2166/// casts (ImplicitCastExpr) and explicit casts that have some 2167/// representation in the source code (ExplicitCastExpr's derived 2168/// classes). 2169class CastExpr : public Expr { 2170public: 2171 typedef clang::CastKind CastKind; 2172 2173private: 2174 Stmt *Op; 2175 2176 void CheckCastConsistency() const { 2177#ifndef NDEBUG 2178 switch (getCastKind()) { 2179 case CK_DerivedToBase: 2180 case CK_UncheckedDerivedToBase: 2181 case CK_DerivedToBaseMemberPointer: 2182 case CK_BaseToDerived: 2183 case CK_BaseToDerivedMemberPointer: 2184 assert(!path_empty() && "Cast kind should have a base path!"); 2185 break; 2186 2187 // These should not have an inheritance path. 2188 case CK_BitCast: 2189 case CK_Dynamic: 2190 case CK_ToUnion: 2191 case CK_ArrayToPointerDecay: 2192 case CK_FunctionToPointerDecay: 2193 case CK_NullToMemberPointer: 2194 case CK_NullToPointer: 2195 case CK_ConstructorConversion: 2196 case CK_IntegralToPointer: 2197 case CK_PointerToIntegral: 2198 case CK_ToVoid: 2199 case CK_VectorSplat: 2200 case CK_IntegralCast: 2201 case CK_IntegralToFloating: 2202 case CK_FloatingToIntegral: 2203 case CK_FloatingCast: 2204 case CK_AnyPointerToObjCPointerCast: 2205 case CK_AnyPointerToBlockPointerCast: 2206 case CK_ObjCObjectLValueCast: 2207 case CK_FloatingRealToComplex: 2208 case CK_FloatingComplexToReal: 2209 case CK_FloatingComplexCast: 2210 case CK_FloatingComplexToIntegralComplex: 2211 case CK_IntegralRealToComplex: 2212 case CK_IntegralComplexToReal: 2213 case CK_IntegralComplexCast: 2214 case CK_IntegralComplexToFloatingComplex: 2215 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 2216 // fallthrough to check for null base path 2217 2218 case CK_Dependent: 2219 case CK_LValueToRValue: 2220 case CK_GetObjCProperty: 2221 case CK_NoOp: 2222 case CK_PointerToBoolean: 2223 case CK_IntegralToBoolean: 2224 case CK_FloatingToBoolean: 2225 case CK_MemberPointerToBoolean: 2226 case CK_FloatingComplexToBoolean: 2227 case CK_IntegralComplexToBoolean: 2228 case CK_LValueBitCast: // -> bool& 2229 case CK_UserDefinedConversion: // operator bool() 2230 assert(path_empty() && "Cast kind should not have a base path!"); 2231 break; 2232 } 2233#endif 2234 } 2235 2236 const CXXBaseSpecifier * const *path_buffer() const { 2237 return const_cast<CastExpr*>(this)->path_buffer(); 2238 } 2239 CXXBaseSpecifier **path_buffer(); 2240 2241protected: 2242 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2243 const CastKind kind, Expr *op, unsigned BasePathSize) : 2244 Expr(SC, ty, VK, OK_Ordinary, 2245 // Cast expressions are type-dependent if the type is 2246 // dependent (C++ [temp.dep.expr]p3). 2247 ty->isDependentType(), 2248 // Cast expressions are value-dependent if the type is 2249 // dependent or if the subexpression is value-dependent. 2250 ty->isDependentType() || (op && op->isValueDependent()), 2251 (ty->containsUnexpandedParameterPack() || 2252 op->containsUnexpandedParameterPack())), 2253 Op(op) { 2254 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2255 CastExprBits.Kind = kind; 2256 CastExprBits.BasePathSize = BasePathSize; 2257 CheckCastConsistency(); 2258 } 2259 2260 /// \brief Construct an empty cast. 2261 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2262 : Expr(SC, Empty) { 2263 CastExprBits.BasePathSize = BasePathSize; 2264 } 2265 2266public: 2267 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2268 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2269 const char *getCastKindName() const; 2270 2271 Expr *getSubExpr() { return cast<Expr>(Op); } 2272 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2273 void setSubExpr(Expr *E) { Op = E; } 2274 2275 /// \brief Retrieve the cast subexpression as it was written in the source 2276 /// code, looking through any implicit casts or other intermediate nodes 2277 /// introduced by semantic analysis. 2278 Expr *getSubExprAsWritten(); 2279 const Expr *getSubExprAsWritten() const { 2280 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2281 } 2282 2283 typedef CXXBaseSpecifier **path_iterator; 2284 typedef const CXXBaseSpecifier * const *path_const_iterator; 2285 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2286 unsigned path_size() const { return CastExprBits.BasePathSize; } 2287 path_iterator path_begin() { return path_buffer(); } 2288 path_iterator path_end() { return path_buffer() + path_size(); } 2289 path_const_iterator path_begin() const { return path_buffer(); } 2290 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2291 2292 void setCastPath(const CXXCastPath &Path); 2293 2294 static bool classof(const Stmt *T) { 2295 return T->getStmtClass() >= firstCastExprConstant && 2296 T->getStmtClass() <= lastCastExprConstant; 2297 } 2298 static bool classof(const CastExpr *) { return true; } 2299 2300 // Iterators 2301 child_range children() { return child_range(&Op, &Op+1); } 2302}; 2303 2304/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2305/// conversions, which have no direct representation in the original 2306/// source code. For example: converting T[]->T*, void f()->void 2307/// (*f)(), float->double, short->int, etc. 2308/// 2309/// In C, implicit casts always produce rvalues. However, in C++, an 2310/// implicit cast whose result is being bound to a reference will be 2311/// an lvalue or xvalue. For example: 2312/// 2313/// @code 2314/// class Base { }; 2315/// class Derived : public Base { }; 2316/// Derived &&ref(); 2317/// void f(Derived d) { 2318/// Base& b = d; // initializer is an ImplicitCastExpr 2319/// // to an lvalue of type Base 2320/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2321/// // to an xvalue of type Base 2322/// } 2323/// @endcode 2324class ImplicitCastExpr : public CastExpr { 2325private: 2326 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2327 unsigned BasePathLength, ExprValueKind VK) 2328 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2329 } 2330 2331 /// \brief Construct an empty implicit cast. 2332 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2333 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2334 2335public: 2336 enum OnStack_t { OnStack }; 2337 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2338 ExprValueKind VK) 2339 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2340 } 2341 2342 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2343 CastKind Kind, Expr *Operand, 2344 const CXXCastPath *BasePath, 2345 ExprValueKind Cat); 2346 2347 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2348 2349 SourceRange getSourceRange() const { 2350 return getSubExpr()->getSourceRange(); 2351 } 2352 2353 static bool classof(const Stmt *T) { 2354 return T->getStmtClass() == ImplicitCastExprClass; 2355 } 2356 static bool classof(const ImplicitCastExpr *) { return true; } 2357}; 2358 2359/// ExplicitCastExpr - An explicit cast written in the source 2360/// code. 2361/// 2362/// This class is effectively an abstract class, because it provides 2363/// the basic representation of an explicitly-written cast without 2364/// specifying which kind of cast (C cast, functional cast, static 2365/// cast, etc.) was written; specific derived classes represent the 2366/// particular style of cast and its location information. 2367/// 2368/// Unlike implicit casts, explicit cast nodes have two different 2369/// types: the type that was written into the source code, and the 2370/// actual type of the expression as determined by semantic 2371/// analysis. These types may differ slightly. For example, in C++ one 2372/// can cast to a reference type, which indicates that the resulting 2373/// expression will be an lvalue or xvalue. The reference type, however, 2374/// will not be used as the type of the expression. 2375class ExplicitCastExpr : public CastExpr { 2376 /// TInfo - Source type info for the (written) type 2377 /// this expression is casting to. 2378 TypeSourceInfo *TInfo; 2379 2380protected: 2381 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2382 CastKind kind, Expr *op, unsigned PathSize, 2383 TypeSourceInfo *writtenTy) 2384 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2385 2386 /// \brief Construct an empty explicit cast. 2387 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2388 : CastExpr(SC, Shell, PathSize) { } 2389 2390public: 2391 /// getTypeInfoAsWritten - Returns the type source info for the type 2392 /// that this expression is casting to. 2393 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2394 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2395 2396 /// getTypeAsWritten - Returns the type that this expression is 2397 /// casting to, as written in the source code. 2398 QualType getTypeAsWritten() const { return TInfo->getType(); } 2399 2400 static bool classof(const Stmt *T) { 2401 return T->getStmtClass() >= firstExplicitCastExprConstant && 2402 T->getStmtClass() <= lastExplicitCastExprConstant; 2403 } 2404 static bool classof(const ExplicitCastExpr *) { return true; } 2405}; 2406 2407/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2408/// cast in C++ (C++ [expr.cast]), which uses the syntax 2409/// (Type)expr. For example: @c (int)f. 2410class CStyleCastExpr : public ExplicitCastExpr { 2411 SourceLocation LPLoc; // the location of the left paren 2412 SourceLocation RPLoc; // the location of the right paren 2413 2414 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2415 unsigned PathSize, TypeSourceInfo *writtenTy, 2416 SourceLocation l, SourceLocation r) 2417 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2418 writtenTy), LPLoc(l), RPLoc(r) {} 2419 2420 /// \brief Construct an empty C-style explicit cast. 2421 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2422 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2423 2424public: 2425 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2426 ExprValueKind VK, CastKind K, 2427 Expr *Op, const CXXCastPath *BasePath, 2428 TypeSourceInfo *WrittenTy, SourceLocation L, 2429 SourceLocation R); 2430 2431 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2432 2433 SourceLocation getLParenLoc() const { return LPLoc; } 2434 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2435 2436 SourceLocation getRParenLoc() const { return RPLoc; } 2437 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2438 2439 SourceRange getSourceRange() const { 2440 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2441 } 2442 static bool classof(const Stmt *T) { 2443 return T->getStmtClass() == CStyleCastExprClass; 2444 } 2445 static bool classof(const CStyleCastExpr *) { return true; } 2446}; 2447 2448/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2449/// 2450/// This expression node kind describes a builtin binary operation, 2451/// such as "x + y" for integer values "x" and "y". The operands will 2452/// already have been converted to appropriate types (e.g., by 2453/// performing promotions or conversions). 2454/// 2455/// In C++, where operators may be overloaded, a different kind of 2456/// expression node (CXXOperatorCallExpr) is used to express the 2457/// invocation of an overloaded operator with operator syntax. Within 2458/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2459/// used to store an expression "x + y" depends on the subexpressions 2460/// for x and y. If neither x or y is type-dependent, and the "+" 2461/// operator resolves to a built-in operation, BinaryOperator will be 2462/// used to express the computation (x and y may still be 2463/// value-dependent). If either x or y is type-dependent, or if the 2464/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2465/// be used to express the computation. 2466class BinaryOperator : public Expr { 2467public: 2468 typedef BinaryOperatorKind Opcode; 2469 2470private: 2471 unsigned Opc : 6; 2472 SourceLocation OpLoc; 2473 2474 enum { LHS, RHS, END_EXPR }; 2475 Stmt* SubExprs[END_EXPR]; 2476public: 2477 2478 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2479 ExprValueKind VK, ExprObjectKind OK, 2480 SourceLocation opLoc) 2481 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2482 lhs->isTypeDependent() || rhs->isTypeDependent(), 2483 lhs->isValueDependent() || rhs->isValueDependent(), 2484 (lhs->containsUnexpandedParameterPack() || 2485 rhs->containsUnexpandedParameterPack())), 2486 Opc(opc), OpLoc(opLoc) { 2487 SubExprs[LHS] = lhs; 2488 SubExprs[RHS] = rhs; 2489 assert(!isCompoundAssignmentOp() && 2490 "Use ArithAssignBinaryOperator for compound assignments"); 2491 } 2492 2493 /// \brief Construct an empty binary operator. 2494 explicit BinaryOperator(EmptyShell Empty) 2495 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2496 2497 SourceLocation getOperatorLoc() const { return OpLoc; } 2498 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2499 2500 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2501 void setOpcode(Opcode O) { Opc = O; } 2502 2503 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2504 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2505 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2506 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2507 2508 SourceRange getSourceRange() const { 2509 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2510 } 2511 2512 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2513 /// corresponds to, e.g. "<<=". 2514 static const char *getOpcodeStr(Opcode Op); 2515 2516 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2517 2518 /// \brief Retrieve the binary opcode that corresponds to the given 2519 /// overloaded operator. 2520 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2521 2522 /// \brief Retrieve the overloaded operator kind that corresponds to 2523 /// the given binary opcode. 2524 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2525 2526 /// predicates to categorize the respective opcodes. 2527 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2528 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2529 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2530 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2531 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2532 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2533 2534 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2535 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2536 2537 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2538 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2539 2540 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2541 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2542 2543 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2544 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2545 2546 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2547 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2548 2549 static bool isAssignmentOp(Opcode Opc) { 2550 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2551 } 2552 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2553 2554 static bool isCompoundAssignmentOp(Opcode Opc) { 2555 return Opc > BO_Assign && Opc <= BO_OrAssign; 2556 } 2557 bool isCompoundAssignmentOp() const { 2558 return isCompoundAssignmentOp(getOpcode()); 2559 } 2560 2561 static bool isShiftAssignOp(Opcode Opc) { 2562 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2563 } 2564 bool isShiftAssignOp() const { 2565 return isShiftAssignOp(getOpcode()); 2566 } 2567 2568 static bool classof(const Stmt *S) { 2569 return S->getStmtClass() >= firstBinaryOperatorConstant && 2570 S->getStmtClass() <= lastBinaryOperatorConstant; 2571 } 2572 static bool classof(const BinaryOperator *) { return true; } 2573 2574 // Iterators 2575 child_range children() { 2576 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2577 } 2578 2579protected: 2580 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2581 ExprValueKind VK, ExprObjectKind OK, 2582 SourceLocation opLoc, bool dead) 2583 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2584 lhs->isTypeDependent() || rhs->isTypeDependent(), 2585 lhs->isValueDependent() || rhs->isValueDependent(), 2586 (lhs->containsUnexpandedParameterPack() || 2587 rhs->containsUnexpandedParameterPack())), 2588 Opc(opc), OpLoc(opLoc) { 2589 SubExprs[LHS] = lhs; 2590 SubExprs[RHS] = rhs; 2591 } 2592 2593 BinaryOperator(StmtClass SC, EmptyShell Empty) 2594 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2595}; 2596 2597/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2598/// track of the type the operation is performed in. Due to the semantics of 2599/// these operators, the operands are promoted, the aritmetic performed, an 2600/// implicit conversion back to the result type done, then the assignment takes 2601/// place. This captures the intermediate type which the computation is done 2602/// in. 2603class CompoundAssignOperator : public BinaryOperator { 2604 QualType ComputationLHSType; 2605 QualType ComputationResultType; 2606public: 2607 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2608 ExprValueKind VK, ExprObjectKind OK, 2609 QualType CompLHSType, QualType CompResultType, 2610 SourceLocation OpLoc) 2611 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2612 ComputationLHSType(CompLHSType), 2613 ComputationResultType(CompResultType) { 2614 assert(isCompoundAssignmentOp() && 2615 "Only should be used for compound assignments"); 2616 } 2617 2618 /// \brief Build an empty compound assignment operator expression. 2619 explicit CompoundAssignOperator(EmptyShell Empty) 2620 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2621 2622 // The two computation types are the type the LHS is converted 2623 // to for the computation and the type of the result; the two are 2624 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2625 QualType getComputationLHSType() const { return ComputationLHSType; } 2626 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2627 2628 QualType getComputationResultType() const { return ComputationResultType; } 2629 void setComputationResultType(QualType T) { ComputationResultType = T; } 2630 2631 static bool classof(const CompoundAssignOperator *) { return true; } 2632 static bool classof(const Stmt *S) { 2633 return S->getStmtClass() == CompoundAssignOperatorClass; 2634 } 2635}; 2636 2637/// AbstractConditionalOperator - An abstract base class for 2638/// ConditionalOperator and BinaryConditionalOperator. 2639class AbstractConditionalOperator : public Expr { 2640 SourceLocation QuestionLoc, ColonLoc; 2641 friend class ASTStmtReader; 2642 2643protected: 2644 AbstractConditionalOperator(StmtClass SC, QualType T, 2645 ExprValueKind VK, ExprObjectKind OK, 2646 bool TD, bool VD, 2647 bool ContainsUnexpandedParameterPack, 2648 SourceLocation qloc, 2649 SourceLocation cloc) 2650 : Expr(SC, T, VK, OK, TD, VD, ContainsUnexpandedParameterPack), 2651 QuestionLoc(qloc), ColonLoc(cloc) {} 2652 2653 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2654 : Expr(SC, Empty) { } 2655 2656public: 2657 // getCond - Return the expression representing the condition for 2658 // the ?: operator. 2659 Expr *getCond() const; 2660 2661 // getTrueExpr - Return the subexpression representing the value of 2662 // the expression if the condition evaluates to true. 2663 Expr *getTrueExpr() const; 2664 2665 // getFalseExpr - Return the subexpression representing the value of 2666 // the expression if the condition evaluates to false. This is 2667 // the same as getRHS. 2668 Expr *getFalseExpr() const; 2669 2670 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2671 SourceLocation getColonLoc() const { return ColonLoc; } 2672 2673 static bool classof(const Stmt *T) { 2674 return T->getStmtClass() == ConditionalOperatorClass || 2675 T->getStmtClass() == BinaryConditionalOperatorClass; 2676 } 2677 static bool classof(const AbstractConditionalOperator *) { return true; } 2678}; 2679 2680/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2681/// middle" extension is a BinaryConditionalOperator. 2682class ConditionalOperator : public AbstractConditionalOperator { 2683 enum { COND, LHS, RHS, END_EXPR }; 2684 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2685 2686 friend class ASTStmtReader; 2687public: 2688 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2689 SourceLocation CLoc, Expr *rhs, 2690 QualType t, ExprValueKind VK, ExprObjectKind OK) 2691 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 2692 // FIXME: the type of the conditional operator doesn't 2693 // depend on the type of the conditional, but the standard 2694 // seems to imply that it could. File a bug! 2695 (lhs->isTypeDependent() || rhs->isTypeDependent()), 2696 (cond->isValueDependent() || lhs->isValueDependent() || 2697 rhs->isValueDependent()), 2698 (cond->containsUnexpandedParameterPack() || 2699 lhs->containsUnexpandedParameterPack() || 2700 rhs->containsUnexpandedParameterPack()), 2701 QLoc, CLoc) { 2702 SubExprs[COND] = cond; 2703 SubExprs[LHS] = lhs; 2704 SubExprs[RHS] = rhs; 2705 } 2706 2707 /// \brief Build an empty conditional operator. 2708 explicit ConditionalOperator(EmptyShell Empty) 2709 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 2710 2711 // getCond - Return the expression representing the condition for 2712 // the ?: operator. 2713 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2714 2715 // getTrueExpr - Return the subexpression representing the value of 2716 // the expression if the condition evaluates to true. 2717 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 2718 2719 // getFalseExpr - Return the subexpression representing the value of 2720 // the expression if the condition evaluates to false. This is 2721 // the same as getRHS. 2722 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2723 2724 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2725 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2726 2727 SourceRange getSourceRange() const { 2728 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2729 } 2730 static bool classof(const Stmt *T) { 2731 return T->getStmtClass() == ConditionalOperatorClass; 2732 } 2733 static bool classof(const ConditionalOperator *) { return true; } 2734 2735 // Iterators 2736 child_range children() { 2737 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2738 } 2739}; 2740 2741/// BinaryConditionalOperator - The GNU extension to the conditional 2742/// operator which allows the middle operand to be omitted. 2743/// 2744/// This is a different expression kind on the assumption that almost 2745/// every client ends up needing to know that these are different. 2746class BinaryConditionalOperator : public AbstractConditionalOperator { 2747 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 2748 2749 /// - the common condition/left-hand-side expression, which will be 2750 /// evaluated as the opaque value 2751 /// - the condition, expressed in terms of the opaque value 2752 /// - the left-hand-side, expressed in terms of the opaque value 2753 /// - the right-hand-side 2754 Stmt *SubExprs[NUM_SUBEXPRS]; 2755 OpaqueValueExpr *OpaqueValue; 2756 2757 friend class ASTStmtReader; 2758public: 2759 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 2760 Expr *cond, Expr *lhs, Expr *rhs, 2761 SourceLocation qloc, SourceLocation cloc, 2762 QualType t, ExprValueKind VK, ExprObjectKind OK) 2763 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 2764 (common->isTypeDependent() || rhs->isTypeDependent()), 2765 (common->isValueDependent() || rhs->isValueDependent()), 2766 (common->containsUnexpandedParameterPack() || 2767 rhs->containsUnexpandedParameterPack()), 2768 qloc, cloc), 2769 OpaqueValue(opaqueValue) { 2770 SubExprs[COMMON] = common; 2771 SubExprs[COND] = cond; 2772 SubExprs[LHS] = lhs; 2773 SubExprs[RHS] = rhs; 2774 2775 OpaqueValue->setSourceExpr(common); 2776 } 2777 2778 /// \brief Build an empty conditional operator. 2779 explicit BinaryConditionalOperator(EmptyShell Empty) 2780 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 2781 2782 /// \brief getCommon - Return the common expression, written to the 2783 /// left of the condition. The opaque value will be bound to the 2784 /// result of this expression. 2785 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 2786 2787 /// \brief getOpaqueValue - Return the opaque value placeholder. 2788 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 2789 2790 /// \brief getCond - Return the condition expression; this is defined 2791 /// in terms of the opaque value. 2792 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2793 2794 /// \brief getTrueExpr - Return the subexpression which will be 2795 /// evaluated if the condition evaluates to true; this is defined 2796 /// in terms of the opaque value. 2797 Expr *getTrueExpr() const { 2798 return cast<Expr>(SubExprs[LHS]); 2799 } 2800 2801 /// \brief getFalseExpr - Return the subexpression which will be 2802 /// evaluated if the condnition evaluates to false; this is 2803 /// defined in terms of the opaque value. 2804 Expr *getFalseExpr() const { 2805 return cast<Expr>(SubExprs[RHS]); 2806 } 2807 2808 SourceRange getSourceRange() const { 2809 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 2810 } 2811 static bool classof(const Stmt *T) { 2812 return T->getStmtClass() == BinaryConditionalOperatorClass; 2813 } 2814 static bool classof(const BinaryConditionalOperator *) { return true; } 2815 2816 // Iterators 2817 child_range children() { 2818 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 2819 } 2820}; 2821 2822inline Expr *AbstractConditionalOperator::getCond() const { 2823 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2824 return co->getCond(); 2825 return cast<BinaryConditionalOperator>(this)->getCond(); 2826} 2827 2828inline Expr *AbstractConditionalOperator::getTrueExpr() const { 2829 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2830 return co->getTrueExpr(); 2831 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 2832} 2833 2834inline Expr *AbstractConditionalOperator::getFalseExpr() const { 2835 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2836 return co->getFalseExpr(); 2837 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 2838} 2839 2840/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2841class AddrLabelExpr : public Expr { 2842 SourceLocation AmpAmpLoc, LabelLoc; 2843 LabelDecl *Label; 2844public: 2845 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 2846 QualType t) 2847 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false), 2848 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2849 2850 /// \brief Build an empty address of a label expression. 2851 explicit AddrLabelExpr(EmptyShell Empty) 2852 : Expr(AddrLabelExprClass, Empty) { } 2853 2854 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2855 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2856 SourceLocation getLabelLoc() const { return LabelLoc; } 2857 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2858 2859 SourceRange getSourceRange() const { 2860 return SourceRange(AmpAmpLoc, LabelLoc); 2861 } 2862 2863 LabelDecl *getLabel() const { return Label; } 2864 void setLabel(LabelDecl *L) { Label = L; } 2865 2866 static bool classof(const Stmt *T) { 2867 return T->getStmtClass() == AddrLabelExprClass; 2868 } 2869 static bool classof(const AddrLabelExpr *) { return true; } 2870 2871 // Iterators 2872 child_range children() { return child_range(); } 2873}; 2874 2875/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2876/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2877/// takes the value of the last subexpression. 2878/// 2879/// A StmtExpr is always an r-value; values "returned" out of a 2880/// StmtExpr will be copied. 2881class StmtExpr : public Expr { 2882 Stmt *SubStmt; 2883 SourceLocation LParenLoc, RParenLoc; 2884public: 2885 // FIXME: Does type-dependence need to be computed differently? 2886 StmtExpr(CompoundStmt *substmt, QualType T, 2887 SourceLocation lp, SourceLocation rp) : 2888 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 2889 T->isDependentType(), false, false), 2890 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2891 2892 /// \brief Build an empty statement expression. 2893 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2894 2895 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2896 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2897 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2898 2899 SourceRange getSourceRange() const { 2900 return SourceRange(LParenLoc, RParenLoc); 2901 } 2902 2903 SourceLocation getLParenLoc() const { return LParenLoc; } 2904 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2905 SourceLocation getRParenLoc() const { return RParenLoc; } 2906 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2907 2908 static bool classof(const Stmt *T) { 2909 return T->getStmtClass() == StmtExprClass; 2910 } 2911 static bool classof(const StmtExpr *) { return true; } 2912 2913 // Iterators 2914 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 2915}; 2916 2917 2918/// ShuffleVectorExpr - clang-specific builtin-in function 2919/// __builtin_shufflevector. 2920/// This AST node represents a operator that does a constant 2921/// shuffle, similar to LLVM's shufflevector instruction. It takes 2922/// two vectors and a variable number of constant indices, 2923/// and returns the appropriately shuffled vector. 2924class ShuffleVectorExpr : public Expr { 2925 SourceLocation BuiltinLoc, RParenLoc; 2926 2927 // SubExprs - the list of values passed to the __builtin_shufflevector 2928 // function. The first two are vectors, and the rest are constant 2929 // indices. The number of values in this list is always 2930 // 2+the number of indices in the vector type. 2931 Stmt **SubExprs; 2932 unsigned NumExprs; 2933 2934public: 2935 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2936 QualType Type, SourceLocation BLoc, 2937 SourceLocation RP); 2938 2939 /// \brief Build an empty vector-shuffle expression. 2940 explicit ShuffleVectorExpr(EmptyShell Empty) 2941 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2942 2943 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2944 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2945 2946 SourceLocation getRParenLoc() const { return RParenLoc; } 2947 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2948 2949 SourceRange getSourceRange() const { 2950 return SourceRange(BuiltinLoc, RParenLoc); 2951 } 2952 static bool classof(const Stmt *T) { 2953 return T->getStmtClass() == ShuffleVectorExprClass; 2954 } 2955 static bool classof(const ShuffleVectorExpr *) { return true; } 2956 2957 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2958 /// constant expression, the actual arguments passed in, and the function 2959 /// pointers. 2960 unsigned getNumSubExprs() const { return NumExprs; } 2961 2962 /// \brief Retrieve the array of expressions. 2963 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 2964 2965 /// getExpr - Return the Expr at the specified index. 2966 Expr *getExpr(unsigned Index) { 2967 assert((Index < NumExprs) && "Arg access out of range!"); 2968 return cast<Expr>(SubExprs[Index]); 2969 } 2970 const Expr *getExpr(unsigned Index) const { 2971 assert((Index < NumExprs) && "Arg access out of range!"); 2972 return cast<Expr>(SubExprs[Index]); 2973 } 2974 2975 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2976 2977 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2978 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2979 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2980 } 2981 2982 // Iterators 2983 child_range children() { 2984 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 2985 } 2986}; 2987 2988/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2989/// This AST node is similar to the conditional operator (?:) in C, with 2990/// the following exceptions: 2991/// - the test expression must be a integer constant expression. 2992/// - the expression returned acts like the chosen subexpression in every 2993/// visible way: the type is the same as that of the chosen subexpression, 2994/// and all predicates (whether it's an l-value, whether it's an integer 2995/// constant expression, etc.) return the same result as for the chosen 2996/// sub-expression. 2997class ChooseExpr : public Expr { 2998 enum { COND, LHS, RHS, END_EXPR }; 2999 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 3000 SourceLocation BuiltinLoc, RParenLoc; 3001public: 3002 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 3003 QualType t, ExprValueKind VK, ExprObjectKind OK, 3004 SourceLocation RP, bool TypeDependent, bool ValueDependent) 3005 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 3006 (cond->containsUnexpandedParameterPack() || 3007 lhs->containsUnexpandedParameterPack() || 3008 rhs->containsUnexpandedParameterPack())), 3009 BuiltinLoc(BLoc), RParenLoc(RP) { 3010 SubExprs[COND] = cond; 3011 SubExprs[LHS] = lhs; 3012 SubExprs[RHS] = rhs; 3013 } 3014 3015 /// \brief Build an empty __builtin_choose_expr. 3016 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 3017 3018 /// isConditionTrue - Return whether the condition is true (i.e. not 3019 /// equal to zero). 3020 bool isConditionTrue(const ASTContext &C) const; 3021 3022 /// getChosenSubExpr - Return the subexpression chosen according to the 3023 /// condition. 3024 Expr *getChosenSubExpr(const ASTContext &C) const { 3025 return isConditionTrue(C) ? getLHS() : getRHS(); 3026 } 3027 3028 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3029 void setCond(Expr *E) { SubExprs[COND] = E; } 3030 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3031 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3032 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3033 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3034 3035 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3036 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3037 3038 SourceLocation getRParenLoc() const { return RParenLoc; } 3039 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3040 3041 SourceRange getSourceRange() const { 3042 return SourceRange(BuiltinLoc, RParenLoc); 3043 } 3044 static bool classof(const Stmt *T) { 3045 return T->getStmtClass() == ChooseExprClass; 3046 } 3047 static bool classof(const ChooseExpr *) { return true; } 3048 3049 // Iterators 3050 child_range children() { 3051 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3052 } 3053}; 3054 3055/// GNUNullExpr - Implements the GNU __null extension, which is a name 3056/// for a null pointer constant that has integral type (e.g., int or 3057/// long) and is the same size and alignment as a pointer. The __null 3058/// extension is typically only used by system headers, which define 3059/// NULL as __null in C++ rather than using 0 (which is an integer 3060/// that may not match the size of a pointer). 3061class GNUNullExpr : public Expr { 3062 /// TokenLoc - The location of the __null keyword. 3063 SourceLocation TokenLoc; 3064 3065public: 3066 GNUNullExpr(QualType Ty, SourceLocation Loc) 3067 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false), 3068 TokenLoc(Loc) { } 3069 3070 /// \brief Build an empty GNU __null expression. 3071 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3072 3073 /// getTokenLocation - The location of the __null token. 3074 SourceLocation getTokenLocation() const { return TokenLoc; } 3075 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3076 3077 SourceRange getSourceRange() const { 3078 return SourceRange(TokenLoc); 3079 } 3080 static bool classof(const Stmt *T) { 3081 return T->getStmtClass() == GNUNullExprClass; 3082 } 3083 static bool classof(const GNUNullExpr *) { return true; } 3084 3085 // Iterators 3086 child_range children() { return child_range(); } 3087}; 3088 3089/// VAArgExpr, used for the builtin function __builtin_va_arg. 3090class VAArgExpr : public Expr { 3091 Stmt *Val; 3092 TypeSourceInfo *TInfo; 3093 SourceLocation BuiltinLoc, RParenLoc; 3094public: 3095 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3096 SourceLocation RPLoc, QualType t) 3097 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3098 t->isDependentType(), false, 3099 (TInfo->getType()->containsUnexpandedParameterPack() || 3100 e->containsUnexpandedParameterPack())), 3101 Val(e), TInfo(TInfo), 3102 BuiltinLoc(BLoc), 3103 RParenLoc(RPLoc) { } 3104 3105 /// \brief Create an empty __builtin_va_arg expression. 3106 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3107 3108 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3109 Expr *getSubExpr() { return cast<Expr>(Val); } 3110 void setSubExpr(Expr *E) { Val = E; } 3111 3112 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3113 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3114 3115 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3116 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3117 3118 SourceLocation getRParenLoc() const { return RParenLoc; } 3119 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3120 3121 SourceRange getSourceRange() const { 3122 return SourceRange(BuiltinLoc, RParenLoc); 3123 } 3124 static bool classof(const Stmt *T) { 3125 return T->getStmtClass() == VAArgExprClass; 3126 } 3127 static bool classof(const VAArgExpr *) { return true; } 3128 3129 // Iterators 3130 child_range children() { return child_range(&Val, &Val+1); } 3131}; 3132 3133/// @brief Describes an C or C++ initializer list. 3134/// 3135/// InitListExpr describes an initializer list, which can be used to 3136/// initialize objects of different types, including 3137/// struct/class/union types, arrays, and vectors. For example: 3138/// 3139/// @code 3140/// struct foo x = { 1, { 2, 3 } }; 3141/// @endcode 3142/// 3143/// Prior to semantic analysis, an initializer list will represent the 3144/// initializer list as written by the user, but will have the 3145/// placeholder type "void". This initializer list is called the 3146/// syntactic form of the initializer, and may contain C99 designated 3147/// initializers (represented as DesignatedInitExprs), initializations 3148/// of subobject members without explicit braces, and so on. Clients 3149/// interested in the original syntax of the initializer list should 3150/// use the syntactic form of the initializer list. 3151/// 3152/// After semantic analysis, the initializer list will represent the 3153/// semantic form of the initializer, where the initializations of all 3154/// subobjects are made explicit with nested InitListExpr nodes and 3155/// C99 designators have been eliminated by placing the designated 3156/// initializations into the subobject they initialize. Additionally, 3157/// any "holes" in the initialization, where no initializer has been 3158/// specified for a particular subobject, will be replaced with 3159/// implicitly-generated ImplicitValueInitExpr expressions that 3160/// value-initialize the subobjects. Note, however, that the 3161/// initializer lists may still have fewer initializers than there are 3162/// elements to initialize within the object. 3163/// 3164/// Given the semantic form of the initializer list, one can retrieve 3165/// the original syntactic form of that initializer list (if it 3166/// exists) using getSyntacticForm(). Since many initializer lists 3167/// have the same syntactic and semantic forms, getSyntacticForm() may 3168/// return NULL, indicating that the current initializer list also 3169/// serves as its syntactic form. 3170class InitListExpr : public Expr { 3171 // FIXME: Eliminate this vector in favor of ASTContext allocation 3172 typedef ASTVector<Stmt *> InitExprsTy; 3173 InitExprsTy InitExprs; 3174 SourceLocation LBraceLoc, RBraceLoc; 3175 3176 /// Contains the initializer list that describes the syntactic form 3177 /// written in the source code. 3178 InitListExpr *SyntacticForm; 3179 3180 /// \brief Either: 3181 /// If this initializer list initializes an array with more elements than 3182 /// there are initializers in the list, specifies an expression to be used 3183 /// for value initialization of the rest of the elements. 3184 /// Or 3185 /// If this initializer list initializes a union, specifies which 3186 /// field within the union will be initialized. 3187 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit; 3188 3189 /// Whether this initializer list originally had a GNU array-range 3190 /// designator in it. This is a temporary marker used by CodeGen. 3191 bool HadArrayRangeDesignator; 3192 3193public: 3194 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3195 Expr **initexprs, unsigned numinits, 3196 SourceLocation rbraceloc); 3197 3198 /// \brief Build an empty initializer list. 3199 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3200 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3201 3202 unsigned getNumInits() const { return InitExprs.size(); } 3203 3204 /// \brief Retrieve the set of initializers. 3205 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3206 3207 const Expr *getInit(unsigned Init) const { 3208 assert(Init < getNumInits() && "Initializer access out of range!"); 3209 return cast_or_null<Expr>(InitExprs[Init]); 3210 } 3211 3212 Expr *getInit(unsigned Init) { 3213 assert(Init < getNumInits() && "Initializer access out of range!"); 3214 return cast_or_null<Expr>(InitExprs[Init]); 3215 } 3216 3217 void setInit(unsigned Init, Expr *expr) { 3218 assert(Init < getNumInits() && "Initializer access out of range!"); 3219 InitExprs[Init] = expr; 3220 } 3221 3222 /// \brief Reserve space for some number of initializers. 3223 void reserveInits(ASTContext &C, unsigned NumInits); 3224 3225 /// @brief Specify the number of initializers 3226 /// 3227 /// If there are more than @p NumInits initializers, the remaining 3228 /// initializers will be destroyed. If there are fewer than @p 3229 /// NumInits initializers, NULL expressions will be added for the 3230 /// unknown initializers. 3231 void resizeInits(ASTContext &Context, unsigned NumInits); 3232 3233 /// @brief Updates the initializer at index @p Init with the new 3234 /// expression @p expr, and returns the old expression at that 3235 /// location. 3236 /// 3237 /// When @p Init is out of range for this initializer list, the 3238 /// initializer list will be extended with NULL expressions to 3239 /// accommodate the new entry. 3240 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3241 3242 /// \brief If this initializer list initializes an array with more elements 3243 /// than there are initializers in the list, specifies an expression to be 3244 /// used for value initialization of the rest of the elements. 3245 Expr *getArrayFiller() { 3246 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>(); 3247 } 3248 void setArrayFiller(Expr *filler); 3249 3250 /// \brief If this initializes a union, specifies which field in the 3251 /// union to initialize. 3252 /// 3253 /// Typically, this field is the first named field within the 3254 /// union. However, a designated initializer can specify the 3255 /// initialization of a different field within the union. 3256 FieldDecl *getInitializedFieldInUnion() { 3257 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>(); 3258 } 3259 void setInitializedFieldInUnion(FieldDecl *FD) { 3260 ArrayFillerOrUnionFieldInit = FD; 3261 } 3262 3263 // Explicit InitListExpr's originate from source code (and have valid source 3264 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3265 bool isExplicit() { 3266 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3267 } 3268 3269 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3270 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3271 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3272 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3273 3274 /// @brief Retrieve the initializer list that describes the 3275 /// syntactic form of the initializer. 3276 /// 3277 /// 3278 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3279 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3280 3281 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3282 void sawArrayRangeDesignator(bool ARD = true) { 3283 HadArrayRangeDesignator = ARD; 3284 } 3285 3286 SourceRange getSourceRange() const; 3287 3288 static bool classof(const Stmt *T) { 3289 return T->getStmtClass() == InitListExprClass; 3290 } 3291 static bool classof(const InitListExpr *) { return true; } 3292 3293 // Iterators 3294 child_range children() { 3295 if (InitExprs.empty()) return child_range(); 3296 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3297 } 3298 3299 typedef InitExprsTy::iterator iterator; 3300 typedef InitExprsTy::const_iterator const_iterator; 3301 typedef InitExprsTy::reverse_iterator reverse_iterator; 3302 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3303 3304 iterator begin() { return InitExprs.begin(); } 3305 const_iterator begin() const { return InitExprs.begin(); } 3306 iterator end() { return InitExprs.end(); } 3307 const_iterator end() const { return InitExprs.end(); } 3308 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3309 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3310 reverse_iterator rend() { return InitExprs.rend(); } 3311 const_reverse_iterator rend() const { return InitExprs.rend(); } 3312 3313 friend class ASTStmtReader; 3314 friend class ASTStmtWriter; 3315}; 3316 3317/// @brief Represents a C99 designated initializer expression. 3318/// 3319/// A designated initializer expression (C99 6.7.8) contains one or 3320/// more designators (which can be field designators, array 3321/// designators, or GNU array-range designators) followed by an 3322/// expression that initializes the field or element(s) that the 3323/// designators refer to. For example, given: 3324/// 3325/// @code 3326/// struct point { 3327/// double x; 3328/// double y; 3329/// }; 3330/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3331/// @endcode 3332/// 3333/// The InitListExpr contains three DesignatedInitExprs, the first of 3334/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3335/// designators, one array designator for @c [2] followed by one field 3336/// designator for @c .y. The initalization expression will be 1.0. 3337class DesignatedInitExpr : public Expr { 3338public: 3339 /// \brief Forward declaration of the Designator class. 3340 class Designator; 3341 3342private: 3343 /// The location of the '=' or ':' prior to the actual initializer 3344 /// expression. 3345 SourceLocation EqualOrColonLoc; 3346 3347 /// Whether this designated initializer used the GNU deprecated 3348 /// syntax rather than the C99 '=' syntax. 3349 bool GNUSyntax : 1; 3350 3351 /// The number of designators in this initializer expression. 3352 unsigned NumDesignators : 15; 3353 3354 /// \brief The designators in this designated initialization 3355 /// expression. 3356 Designator *Designators; 3357 3358 /// The number of subexpressions of this initializer expression, 3359 /// which contains both the initializer and any additional 3360 /// expressions used by array and array-range designators. 3361 unsigned NumSubExprs : 16; 3362 3363 3364 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3365 const Designator *Designators, 3366 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3367 Expr **IndexExprs, unsigned NumIndexExprs, 3368 Expr *Init); 3369 3370 explicit DesignatedInitExpr(unsigned NumSubExprs) 3371 : Expr(DesignatedInitExprClass, EmptyShell()), 3372 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3373 3374public: 3375 /// A field designator, e.g., ".x". 3376 struct FieldDesignator { 3377 /// Refers to the field that is being initialized. The low bit 3378 /// of this field determines whether this is actually a pointer 3379 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3380 /// initially constructed, a field designator will store an 3381 /// IdentifierInfo*. After semantic analysis has resolved that 3382 /// name, the field designator will instead store a FieldDecl*. 3383 uintptr_t NameOrField; 3384 3385 /// The location of the '.' in the designated initializer. 3386 unsigned DotLoc; 3387 3388 /// The location of the field name in the designated initializer. 3389 unsigned FieldLoc; 3390 }; 3391 3392 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3393 struct ArrayOrRangeDesignator { 3394 /// Location of the first index expression within the designated 3395 /// initializer expression's list of subexpressions. 3396 unsigned Index; 3397 /// The location of the '[' starting the array range designator. 3398 unsigned LBracketLoc; 3399 /// The location of the ellipsis separating the start and end 3400 /// indices. Only valid for GNU array-range designators. 3401 unsigned EllipsisLoc; 3402 /// The location of the ']' terminating the array range designator. 3403 unsigned RBracketLoc; 3404 }; 3405 3406 /// @brief Represents a single C99 designator. 3407 /// 3408 /// @todo This class is infuriatingly similar to clang::Designator, 3409 /// but minor differences (storing indices vs. storing pointers) 3410 /// keep us from reusing it. Try harder, later, to rectify these 3411 /// differences. 3412 class Designator { 3413 /// @brief The kind of designator this describes. 3414 enum { 3415 FieldDesignator, 3416 ArrayDesignator, 3417 ArrayRangeDesignator 3418 } Kind; 3419 3420 union { 3421 /// A field designator, e.g., ".x". 3422 struct FieldDesignator Field; 3423 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3424 struct ArrayOrRangeDesignator ArrayOrRange; 3425 }; 3426 friend class DesignatedInitExpr; 3427 3428 public: 3429 Designator() {} 3430 3431 /// @brief Initializes a field designator. 3432 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3433 SourceLocation FieldLoc) 3434 : Kind(FieldDesignator) { 3435 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3436 Field.DotLoc = DotLoc.getRawEncoding(); 3437 Field.FieldLoc = FieldLoc.getRawEncoding(); 3438 } 3439 3440 /// @brief Initializes an array designator. 3441 Designator(unsigned Index, SourceLocation LBracketLoc, 3442 SourceLocation RBracketLoc) 3443 : Kind(ArrayDesignator) { 3444 ArrayOrRange.Index = Index; 3445 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3446 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3447 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3448 } 3449 3450 /// @brief Initializes a GNU array-range designator. 3451 Designator(unsigned Index, SourceLocation LBracketLoc, 3452 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3453 : Kind(ArrayRangeDesignator) { 3454 ArrayOrRange.Index = Index; 3455 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3456 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3457 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3458 } 3459 3460 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3461 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3462 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3463 3464 IdentifierInfo * getFieldName(); 3465 3466 FieldDecl *getField() { 3467 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3468 if (Field.NameOrField & 0x01) 3469 return 0; 3470 else 3471 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3472 } 3473 3474 void setField(FieldDecl *FD) { 3475 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3476 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3477 } 3478 3479 SourceLocation getDotLoc() const { 3480 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3481 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3482 } 3483 3484 SourceLocation getFieldLoc() const { 3485 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3486 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3487 } 3488 3489 SourceLocation getLBracketLoc() const { 3490 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3491 "Only valid on an array or array-range designator"); 3492 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3493 } 3494 3495 SourceLocation getRBracketLoc() const { 3496 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3497 "Only valid on an array or array-range designator"); 3498 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3499 } 3500 3501 SourceLocation getEllipsisLoc() const { 3502 assert(Kind == ArrayRangeDesignator && 3503 "Only valid on an array-range designator"); 3504 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3505 } 3506 3507 unsigned getFirstExprIndex() const { 3508 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3509 "Only valid on an array or array-range designator"); 3510 return ArrayOrRange.Index; 3511 } 3512 3513 SourceLocation getStartLocation() const { 3514 if (Kind == FieldDesignator) 3515 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3516 else 3517 return getLBracketLoc(); 3518 } 3519 SourceLocation getEndLocation() const { 3520 return Kind == FieldDesignator ? getFieldLoc() : getRBracketLoc(); 3521 } 3522 SourceRange getSourceRange() const { 3523 return SourceRange(getStartLocation(), getEndLocation()); 3524 } 3525 }; 3526 3527 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3528 unsigned NumDesignators, 3529 Expr **IndexExprs, unsigned NumIndexExprs, 3530 SourceLocation EqualOrColonLoc, 3531 bool GNUSyntax, Expr *Init); 3532 3533 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3534 3535 /// @brief Returns the number of designators in this initializer. 3536 unsigned size() const { return NumDesignators; } 3537 3538 // Iterator access to the designators. 3539 typedef Designator* designators_iterator; 3540 designators_iterator designators_begin() { return Designators; } 3541 designators_iterator designators_end() { 3542 return Designators + NumDesignators; 3543 } 3544 3545 typedef std::reverse_iterator<designators_iterator> 3546 reverse_designators_iterator; 3547 reverse_designators_iterator designators_rbegin() { 3548 return reverse_designators_iterator(designators_end()); 3549 } 3550 reverse_designators_iterator designators_rend() { 3551 return reverse_designators_iterator(designators_begin()); 3552 } 3553 3554 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3555 3556 void setDesignators(ASTContext &C, const Designator *Desigs, 3557 unsigned NumDesigs); 3558 3559 Expr *getArrayIndex(const Designator& D); 3560 Expr *getArrayRangeStart(const Designator& D); 3561 Expr *getArrayRangeEnd(const Designator& D); 3562 3563 /// @brief Retrieve the location of the '=' that precedes the 3564 /// initializer value itself, if present. 3565 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3566 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3567 3568 /// @brief Determines whether this designated initializer used the 3569 /// deprecated GNU syntax for designated initializers. 3570 bool usesGNUSyntax() const { return GNUSyntax; } 3571 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3572 3573 /// @brief Retrieve the initializer value. 3574 Expr *getInit() const { 3575 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3576 } 3577 3578 void setInit(Expr *init) { 3579 *child_begin() = init; 3580 } 3581 3582 /// \brief Retrieve the total number of subexpressions in this 3583 /// designated initializer expression, including the actual 3584 /// initialized value and any expressions that occur within array 3585 /// and array-range designators. 3586 unsigned getNumSubExprs() const { return NumSubExprs; } 3587 3588 Expr *getSubExpr(unsigned Idx) { 3589 assert(Idx < NumSubExprs && "Subscript out of range"); 3590 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3591 Ptr += sizeof(DesignatedInitExpr); 3592 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3593 } 3594 3595 void setSubExpr(unsigned Idx, Expr *E) { 3596 assert(Idx < NumSubExprs && "Subscript out of range"); 3597 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3598 Ptr += sizeof(DesignatedInitExpr); 3599 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3600 } 3601 3602 /// \brief Replaces the designator at index @p Idx with the series 3603 /// of designators in [First, Last). 3604 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3605 const Designator *Last); 3606 3607 SourceRange getDesignatorsSourceRange() const; 3608 3609 SourceRange getSourceRange() const; 3610 3611 static bool classof(const Stmt *T) { 3612 return T->getStmtClass() == DesignatedInitExprClass; 3613 } 3614 static bool classof(const DesignatedInitExpr *) { return true; } 3615 3616 // Iterators 3617 child_range children() { 3618 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3619 return child_range(begin, begin + NumSubExprs); 3620 } 3621}; 3622 3623/// \brief Represents an implicitly-generated value initialization of 3624/// an object of a given type. 3625/// 3626/// Implicit value initializations occur within semantic initializer 3627/// list expressions (InitListExpr) as placeholders for subobject 3628/// initializations not explicitly specified by the user. 3629/// 3630/// \see InitListExpr 3631class ImplicitValueInitExpr : public Expr { 3632public: 3633 explicit ImplicitValueInitExpr(QualType ty) 3634 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3635 false, false, false) { } 3636 3637 /// \brief Construct an empty implicit value initialization. 3638 explicit ImplicitValueInitExpr(EmptyShell Empty) 3639 : Expr(ImplicitValueInitExprClass, Empty) { } 3640 3641 static bool classof(const Stmt *T) { 3642 return T->getStmtClass() == ImplicitValueInitExprClass; 3643 } 3644 static bool classof(const ImplicitValueInitExpr *) { return true; } 3645 3646 SourceRange getSourceRange() const { 3647 return SourceRange(); 3648 } 3649 3650 // Iterators 3651 child_range children() { return child_range(); } 3652}; 3653 3654 3655class ParenListExpr : public Expr { 3656 Stmt **Exprs; 3657 unsigned NumExprs; 3658 SourceLocation LParenLoc, RParenLoc; 3659 3660public: 3661 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3662 unsigned numexprs, SourceLocation rparenloc); 3663 3664 /// \brief Build an empty paren list. 3665 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3666 3667 unsigned getNumExprs() const { return NumExprs; } 3668 3669 const Expr* getExpr(unsigned Init) const { 3670 assert(Init < getNumExprs() && "Initializer access out of range!"); 3671 return cast_or_null<Expr>(Exprs[Init]); 3672 } 3673 3674 Expr* getExpr(unsigned Init) { 3675 assert(Init < getNumExprs() && "Initializer access out of range!"); 3676 return cast_or_null<Expr>(Exprs[Init]); 3677 } 3678 3679 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3680 3681 SourceLocation getLParenLoc() const { return LParenLoc; } 3682 SourceLocation getRParenLoc() const { return RParenLoc; } 3683 3684 SourceRange getSourceRange() const { 3685 return SourceRange(LParenLoc, RParenLoc); 3686 } 3687 static bool classof(const Stmt *T) { 3688 return T->getStmtClass() == ParenListExprClass; 3689 } 3690 static bool classof(const ParenListExpr *) { return true; } 3691 3692 // Iterators 3693 child_range children() { 3694 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 3695 } 3696 3697 friend class ASTStmtReader; 3698 friend class ASTStmtWriter; 3699}; 3700 3701 3702/// \brief Represents a C1X generic selection. 3703/// 3704/// A generic selection (C1X 6.5.1.1) contains an unevaluated controlling 3705/// expression, followed by one or more generic associations. Each generic 3706/// association specifies a type name and an expression, or "default" and an 3707/// expression (in which case it is known as a default generic association). 3708/// The type and value of the generic selection are identical to those of its 3709/// result expression, which is defined as the expression in the generic 3710/// association with a type name that is compatible with the type of the 3711/// controlling expression, or the expression in the default generic association 3712/// if no types are compatible. For example: 3713/// 3714/// @code 3715/// _Generic(X, double: 1, float: 2, default: 3) 3716/// @endcode 3717/// 3718/// The above expression evaluates to 1 if 1.0 is substituted for X, 2 if 1.0f 3719/// or 3 if "hello". 3720/// 3721/// As an extension, generic selections are allowed in C++, where the following 3722/// additional semantics apply: 3723/// 3724/// Any generic selection whose controlling expression is type-dependent or 3725/// which names a dependent type in its association list is result-dependent, 3726/// which means that the choice of result expression is dependent. 3727/// Result-dependent generic associations are both type- and value-dependent. 3728class GenericSelectionExpr : public Expr { 3729 enum { CONTROLLING, END_EXPR }; 3730 TypeSourceInfo **AssocTypes; 3731 Stmt **SubExprs; 3732 unsigned NumAssocs, ResultIndex; 3733 SourceLocation GenericLoc, DefaultLoc, RParenLoc; 3734 3735public: 3736 GenericSelectionExpr(ASTContext &Context, 3737 SourceLocation GenericLoc, Expr *ControllingExpr, 3738 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3739 unsigned NumAssocs, SourceLocation DefaultLoc, 3740 SourceLocation RParenLoc, 3741 bool ContainsUnexpandedParameterPack, 3742 unsigned ResultIndex); 3743 3744 /// This constructor is used in the result-dependent case. 3745 GenericSelectionExpr(ASTContext &Context, 3746 SourceLocation GenericLoc, Expr *ControllingExpr, 3747 TypeSourceInfo **AssocTypes, Expr **AssocExprs, 3748 unsigned NumAssocs, SourceLocation DefaultLoc, 3749 SourceLocation RParenLoc, 3750 bool ContainsUnexpandedParameterPack); 3751 3752 explicit GenericSelectionExpr(EmptyShell Empty) 3753 : Expr(GenericSelectionExprClass, Empty) { } 3754 3755 unsigned getNumAssocs() const { return NumAssocs; } 3756 3757 SourceLocation getGenericLoc() const { return GenericLoc; } 3758 SourceLocation getDefaultLoc() const { return DefaultLoc; } 3759 SourceLocation getRParenLoc() const { return RParenLoc; } 3760 3761 const Expr *getAssocExpr(unsigned i) const { 3762 return cast<Expr>(SubExprs[END_EXPR+i]); 3763 } 3764 Expr *getAssocExpr(unsigned i) { return cast<Expr>(SubExprs[END_EXPR+i]); } 3765 3766 const TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) const { 3767 return AssocTypes[i]; 3768 } 3769 TypeSourceInfo *getAssocTypeSourceInfo(unsigned i) { return AssocTypes[i]; } 3770 3771 QualType getAssocType(unsigned i) const { 3772 if (const TypeSourceInfo *TS = getAssocTypeSourceInfo(i)) 3773 return TS->getType(); 3774 else 3775 return QualType(); 3776 } 3777 3778 const Expr *getControllingExpr() const { 3779 return cast<Expr>(SubExprs[CONTROLLING]); 3780 } 3781 Expr *getControllingExpr() { return cast<Expr>(SubExprs[CONTROLLING]); } 3782 3783 /// Whether this generic selection is result-dependent. 3784 bool isResultDependent() const { return ResultIndex == -1U; } 3785 3786 /// The zero-based index of the result expression's generic association in 3787 /// the generic selection's association list. Defined only if the 3788 /// generic selection is not result-dependent. 3789 unsigned getResultIndex() const { 3790 assert(!isResultDependent() && "Generic selection is result-dependent"); 3791 return ResultIndex; 3792 } 3793 3794 /// The generic selection's result expression. Defined only if the 3795 /// generic selection is not result-dependent. 3796 const Expr *getResultExpr() const { return getAssocExpr(getResultIndex()); } 3797 Expr *getResultExpr() { return getAssocExpr(getResultIndex()); } 3798 3799 SourceRange getSourceRange() const { 3800 return SourceRange(GenericLoc, RParenLoc); 3801 } 3802 static bool classof(const Stmt *T) { 3803 return T->getStmtClass() == GenericSelectionExprClass; 3804 } 3805 static bool classof(const GenericSelectionExpr *) { return true; } 3806 3807 child_range children() { 3808 return child_range(SubExprs, SubExprs+END_EXPR+NumAssocs); 3809 } 3810 3811 friend class ASTStmtReader; 3812}; 3813 3814//===----------------------------------------------------------------------===// 3815// Clang Extensions 3816//===----------------------------------------------------------------------===// 3817 3818 3819/// ExtVectorElementExpr - This represents access to specific elements of a 3820/// vector, and may occur on the left hand side or right hand side. For example 3821/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3822/// 3823/// Note that the base may have either vector or pointer to vector type, just 3824/// like a struct field reference. 3825/// 3826class ExtVectorElementExpr : public Expr { 3827 Stmt *Base; 3828 IdentifierInfo *Accessor; 3829 SourceLocation AccessorLoc; 3830public: 3831 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 3832 IdentifierInfo &accessor, SourceLocation loc) 3833 : Expr(ExtVectorElementExprClass, ty, VK, 3834 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 3835 base->isTypeDependent(), base->isValueDependent(), 3836 base->containsUnexpandedParameterPack()), 3837 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3838 3839 /// \brief Build an empty vector element expression. 3840 explicit ExtVectorElementExpr(EmptyShell Empty) 3841 : Expr(ExtVectorElementExprClass, Empty) { } 3842 3843 const Expr *getBase() const { return cast<Expr>(Base); } 3844 Expr *getBase() { return cast<Expr>(Base); } 3845 void setBase(Expr *E) { Base = E; } 3846 3847 IdentifierInfo &getAccessor() const { return *Accessor; } 3848 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3849 3850 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3851 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3852 3853 /// getNumElements - Get the number of components being selected. 3854 unsigned getNumElements() const; 3855 3856 /// containsDuplicateElements - Return true if any element access is 3857 /// repeated. 3858 bool containsDuplicateElements() const; 3859 3860 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3861 /// aggregate Constant of ConstantInt(s). 3862 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3863 3864 SourceRange getSourceRange() const { 3865 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3866 } 3867 3868 /// isArrow - Return true if the base expression is a pointer to vector, 3869 /// return false if the base expression is a vector. 3870 bool isArrow() const; 3871 3872 static bool classof(const Stmt *T) { 3873 return T->getStmtClass() == ExtVectorElementExprClass; 3874 } 3875 static bool classof(const ExtVectorElementExpr *) { return true; } 3876 3877 // Iterators 3878 child_range children() { return child_range(&Base, &Base+1); } 3879}; 3880 3881 3882/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3883/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3884class BlockExpr : public Expr { 3885protected: 3886 BlockDecl *TheBlock; 3887public: 3888 BlockExpr(BlockDecl *BD, QualType ty) 3889 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 3890 ty->isDependentType(), false, false), 3891 TheBlock(BD) {} 3892 3893 /// \brief Build an empty block expression. 3894 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3895 3896 const BlockDecl *getBlockDecl() const { return TheBlock; } 3897 BlockDecl *getBlockDecl() { return TheBlock; } 3898 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3899 3900 // Convenience functions for probing the underlying BlockDecl. 3901 SourceLocation getCaretLocation() const; 3902 const Stmt *getBody() const; 3903 Stmt *getBody(); 3904 3905 SourceRange getSourceRange() const { 3906 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3907 } 3908 3909 /// getFunctionType - Return the underlying function type for this block. 3910 const FunctionType *getFunctionType() const; 3911 3912 static bool classof(const Stmt *T) { 3913 return T->getStmtClass() == BlockExprClass; 3914 } 3915 static bool classof(const BlockExpr *) { return true; } 3916 3917 // Iterators 3918 child_range children() { return child_range(); } 3919}; 3920 3921/// BlockDeclRefExpr - A reference to a local variable declared in an 3922/// enclosing scope. 3923class BlockDeclRefExpr : public Expr { 3924 VarDecl *D; 3925 SourceLocation Loc; 3926 bool IsByRef : 1; 3927 bool ConstQualAdded : 1; 3928public: 3929 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 3930 SourceLocation l, bool ByRef, bool constAdded = false); 3931 3932 // \brief Build an empty reference to a declared variable in a 3933 // block. 3934 explicit BlockDeclRefExpr(EmptyShell Empty) 3935 : Expr(BlockDeclRefExprClass, Empty) { } 3936 3937 VarDecl *getDecl() { return D; } 3938 const VarDecl *getDecl() const { return D; } 3939 void setDecl(VarDecl *VD) { D = VD; } 3940 3941 SourceLocation getLocation() const { return Loc; } 3942 void setLocation(SourceLocation L) { Loc = L; } 3943 3944 SourceRange getSourceRange() const { return SourceRange(Loc); } 3945 3946 bool isByRef() const { return IsByRef; } 3947 void setByRef(bool BR) { IsByRef = BR; } 3948 3949 bool isConstQualAdded() const { return ConstQualAdded; } 3950 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3951 3952 static bool classof(const Stmt *T) { 3953 return T->getStmtClass() == BlockDeclRefExprClass; 3954 } 3955 static bool classof(const BlockDeclRefExpr *) { return true; } 3956 3957 // Iterators 3958 child_range children() { return child_range(); } 3959}; 3960 3961} // end namespace clang 3962 3963#endif 3964