Expr.h revision 56ca35d396d8692c384c785f9aeebcf22563fe1e
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 "llvm/ADT/APSInt.h" 25#include "llvm/ADT/APFloat.h" 26#include "llvm/ADT/SmallVector.h" 27#include "llvm/ADT/StringRef.h" 28#include <cctype> 29#include <vector> 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_MemberFunction, 176 LV_SubObjCPropertySetting, 177 LV_ClassTemporary 178 }; 179 /// Reasons why an expression might not be an l-value. 180 LValueClassification ClassifyLValue(ASTContext &Ctx) const; 181 182 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 183 /// does not have an incomplete type, does not have a const-qualified type, 184 /// and if it is a structure or union, does not have any member (including, 185 /// recursively, any member or element of all contained aggregates or unions) 186 /// with a const-qualified type. 187 /// 188 /// \param Loc [in] [out] - A source location which *may* be filled 189 /// in with the location of the expression making this a 190 /// non-modifiable lvalue, if specified. 191 enum isModifiableLvalueResult { 192 MLV_Valid, 193 MLV_NotObjectType, 194 MLV_IncompleteVoidType, 195 MLV_DuplicateVectorComponents, 196 MLV_InvalidExpression, 197 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 198 MLV_IncompleteType, 199 MLV_ConstQualified, 200 MLV_ArrayType, 201 MLV_NotBlockQualified, 202 MLV_ReadonlyProperty, 203 MLV_NoSetterProperty, 204 MLV_MemberFunction, 205 MLV_SubObjCPropertySetting, 206 MLV_ClassTemporary 207 }; 208 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 209 SourceLocation *Loc = 0) const; 210 211 /// \brief The return type of classify(). Represents the C++0x expression 212 /// taxonomy. 213 class Classification { 214 public: 215 /// \brief The various classification results. Most of these mean prvalue. 216 enum Kinds { 217 CL_LValue, 218 CL_XValue, 219 CL_Function, // Functions cannot be lvalues in C. 220 CL_Void, // Void cannot be an lvalue in C. 221 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 222 CL_MemberFunction, // An expression referring to a member function 223 CL_SubObjCPropertySetting, 224 CL_ClassTemporary, // A prvalue of class type 225 CL_PRValue // A prvalue for any other reason, of any other type 226 }; 227 /// \brief The results of modification testing. 228 enum ModifiableType { 229 CM_Untested, // testModifiable was false. 230 CM_Modifiable, 231 CM_RValue, // Not modifiable because it's an rvalue 232 CM_Function, // Not modifiable because it's a function; C++ only 233 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 234 CM_NotBlockQualified, // Not captured in the closure 235 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 236 CM_ConstQualified, 237 CM_ArrayType, 238 CM_IncompleteType 239 }; 240 241 private: 242 friend class Expr; 243 244 unsigned short Kind; 245 unsigned short Modifiable; 246 247 explicit Classification(Kinds k, ModifiableType m) 248 : Kind(k), Modifiable(m) 249 {} 250 251 public: 252 Classification() {} 253 254 Kinds getKind() const { return static_cast<Kinds>(Kind); } 255 ModifiableType getModifiable() const { 256 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 257 return static_cast<ModifiableType>(Modifiable); 258 } 259 bool isLValue() const { return Kind == CL_LValue; } 260 bool isXValue() const { return Kind == CL_XValue; } 261 bool isGLValue() const { return Kind <= CL_XValue; } 262 bool isPRValue() const { return Kind >= CL_Function; } 263 bool isRValue() const { return Kind >= CL_XValue; } 264 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 265 266 /// \brief Create a simple, modifiably lvalue 267 static Classification makeSimpleLValue() { 268 return Classification(CL_LValue, CM_Modifiable); 269 } 270 271 }; 272 /// \brief Classify - Classify this expression according to the C++0x 273 /// expression taxonomy. 274 /// 275 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 276 /// old lvalue vs rvalue. This function determines the type of expression this 277 /// is. There are three expression types: 278 /// - lvalues are classical lvalues as in C++03. 279 /// - prvalues are equivalent to rvalues in C++03. 280 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 281 /// function returning an rvalue reference. 282 /// lvalues and xvalues are collectively referred to as glvalues, while 283 /// prvalues and xvalues together form rvalues. 284 Classification Classify(ASTContext &Ctx) const { 285 return ClassifyImpl(Ctx, 0); 286 } 287 288 /// \brief ClassifyModifiable - Classify this expression according to the 289 /// C++0x expression taxonomy, and see if it is valid on the left side 290 /// of an assignment. 291 /// 292 /// This function extends classify in that it also tests whether the 293 /// expression is modifiable (C99 6.3.2.1p1). 294 /// \param Loc A source location that might be filled with a relevant location 295 /// if the expression is not modifiable. 296 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 297 return ClassifyImpl(Ctx, &Loc); 298 } 299 300 /// getValueKindForType - Given a formal return or parameter type, 301 /// give its value kind. 302 static ExprValueKind getValueKindForType(QualType T) { 303 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 304 return (isa<LValueReferenceType>(RT) 305 ? VK_LValue 306 : (RT->getPointeeType()->isFunctionType() 307 ? VK_LValue : VK_XValue)); 308 return VK_RValue; 309 } 310 311 /// getValueKind - The value kind that this expression produces. 312 ExprValueKind getValueKind() const { 313 return static_cast<ExprValueKind>(ExprBits.ValueKind); 314 } 315 316 /// getObjectKind - The object kind that this expression produces. 317 /// Object kinds are meaningful only for expressions that yield an 318 /// l-value or x-value. 319 ExprObjectKind getObjectKind() const { 320 return static_cast<ExprObjectKind>(ExprBits.ObjectKind); 321 } 322 323 bool isOrdinaryOrBitFieldObject() const { 324 ExprObjectKind OK = getObjectKind(); 325 return (OK == OK_Ordinary || OK == OK_BitField); 326 } 327 328 /// setValueKind - Set the value kind produced by this expression. 329 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 330 331 /// setObjectKind - Set the object kind produced by this expression. 332 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; } 333 334private: 335 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 336 337public: 338 339 /// \brief If this expression refers to a bit-field, retrieve the 340 /// declaration of that bit-field. 341 FieldDecl *getBitField(); 342 343 const FieldDecl *getBitField() const { 344 return const_cast<Expr*>(this)->getBitField(); 345 } 346 347 /// \brief If this expression is an l-value for an Objective C 348 /// property, find the underlying property reference expression. 349 const ObjCPropertyRefExpr *getObjCProperty() const; 350 351 /// \brief Returns whether this expression refers to a vector element. 352 bool refersToVectorElement() const; 353 354 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 355 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 356 /// but also int expressions which are produced by things like comparisons in 357 /// C. 358 bool isKnownToHaveBooleanValue() const; 359 360 /// isIntegerConstantExpr - Return true if this expression is a valid integer 361 /// constant expression, and, if so, return its value in Result. If not a 362 /// valid i-c-e, return false and fill in Loc (if specified) with the location 363 /// of the invalid expression. 364 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 365 SourceLocation *Loc = 0, 366 bool isEvaluated = true) const; 367 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 368 llvm::APSInt X; 369 return isIntegerConstantExpr(X, Ctx, Loc); 370 } 371 /// isConstantInitializer - Returns true if this expression is a constant 372 /// initializer, which can be emitted at compile-time. 373 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 374 375 /// EvalResult is a struct with detailed info about an evaluated expression. 376 struct EvalResult { 377 /// Val - This is the value the expression can be folded to. 378 APValue Val; 379 380 /// HasSideEffects - Whether the evaluated expression has side effects. 381 /// For example, (f() && 0) can be folded, but it still has side effects. 382 bool HasSideEffects; 383 384 /// Diag - If the expression is unfoldable, then Diag contains a note 385 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 386 /// position for the error, and DiagExpr is the expression that caused 387 /// the error. 388 /// If the expression is foldable, but not an integer constant expression, 389 /// Diag contains a note diagnostic that describes why it isn't an integer 390 /// constant expression. If the expression *is* an integer constant 391 /// expression, then Diag will be zero. 392 unsigned Diag; 393 const Expr *DiagExpr; 394 SourceLocation DiagLoc; 395 396 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 397 398 // isGlobalLValue - Return true if the evaluated lvalue expression 399 // is global. 400 bool isGlobalLValue() const; 401 // hasSideEffects - Return true if the evaluated expression has 402 // side effects. 403 bool hasSideEffects() const { 404 return HasSideEffects; 405 } 406 }; 407 408 /// Evaluate - Return true if this is a constant which we can fold using 409 /// any crazy technique (that has nothing to do with language standards) that 410 /// we want to. If this function returns true, it returns the folded constant 411 /// in Result. 412 bool Evaluate(EvalResult &Result, const ASTContext &Ctx) const; 413 414 /// EvaluateAsBooleanCondition - Return true if this is a constant 415 /// which we we can fold and convert to a boolean condition using 416 /// any crazy technique that we want to. 417 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx) const; 418 419 /// isEvaluatable - Call Evaluate to see if this expression can be constant 420 /// folded, but discard the result. 421 bool isEvaluatable(const ASTContext &Ctx) const; 422 423 /// HasSideEffects - This routine returns true for all those expressions 424 /// which must be evaluated each time and must not be optimized away 425 /// or evaluated at compile time. Example is a function call, volatile 426 /// variable read. 427 bool HasSideEffects(const ASTContext &Ctx) const; 428 429 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 430 /// must be called on an expression that constant folds to an integer. 431 llvm::APSInt EvaluateAsInt(const ASTContext &Ctx) const; 432 433 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 434 /// with link time known address. 435 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx) const; 436 437 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue. 438 bool EvaluateAsAnyLValue(EvalResult &Result, const ASTContext &Ctx) const; 439 440 /// \brief Enumeration used to describe how \c isNullPointerConstant() 441 /// should cope with value-dependent expressions. 442 enum NullPointerConstantValueDependence { 443 /// \brief Specifies that the expression should never be value-dependent. 444 NPC_NeverValueDependent = 0, 445 446 /// \brief Specifies that a value-dependent expression of integral or 447 /// dependent type should be considered a null pointer constant. 448 NPC_ValueDependentIsNull, 449 450 /// \brief Specifies that a value-dependent expression should be considered 451 /// to never be a null pointer constant. 452 NPC_ValueDependentIsNotNull 453 }; 454 455 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 456 /// integer constant expression with the value zero, or if this is one that is 457 /// cast to void*. 458 bool isNullPointerConstant(ASTContext &Ctx, 459 NullPointerConstantValueDependence NPC) const; 460 461 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 462 /// write barrier. 463 bool isOBJCGCCandidate(ASTContext &Ctx) const; 464 465 /// \brief Returns true if this expression is a bound member function. 466 bool isBoundMemberFunction(ASTContext &Ctx) const; 467 468 /// \brief Result type of CanThrow(). 469 enum CanThrowResult { 470 CT_Cannot, 471 CT_Dependent, 472 CT_Can 473 }; 474 /// \brief Test if this expression, if evaluated, might throw, according to 475 /// the rules of C++ [expr.unary.noexcept]. 476 CanThrowResult CanThrow(ASTContext &C) const; 477 478 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 479 /// its subexpression. If that subexpression is also a ParenExpr, 480 /// then this method recursively returns its subexpression, and so forth. 481 /// Otherwise, the method returns the current Expr. 482 Expr *IgnoreParens(); 483 484 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 485 /// or CastExprs, returning their operand. 486 Expr *IgnoreParenCasts(); 487 488 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 489 /// ParenExpr or ImplicitCastExprs, returning their operand. 490 Expr *IgnoreParenImpCasts(); 491 492 const Expr *IgnoreParenImpCasts() const { 493 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 494 } 495 496 /// Ignore parentheses and lvalue casts. Strip off any ParenExpr and 497 /// CastExprs that represent lvalue casts, returning their operand. 498 Expr *IgnoreParenLValueCasts(); 499 500 const Expr *IgnoreParenLValueCasts() const { 501 return const_cast<Expr*>(this)->IgnoreParenLValueCasts(); 502 } 503 504 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 505 /// value (including ptr->int casts of the same size). Strip off any 506 /// ParenExpr or CastExprs, returning their operand. 507 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 508 509 /// \brief Determine whether this expression is a default function argument. 510 /// 511 /// Default arguments are implicitly generated in the abstract syntax tree 512 /// by semantic analysis for function calls, object constructions, etc. in 513 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 514 /// this routine also looks through any implicit casts to determine whether 515 /// the expression is a default argument. 516 bool isDefaultArgument() const; 517 518 /// \brief Determine whether the result of this expression is a 519 /// temporary object of the given class type. 520 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 521 522 const Expr *IgnoreParens() const { 523 return const_cast<Expr*>(this)->IgnoreParens(); 524 } 525 const Expr *IgnoreParenCasts() const { 526 return const_cast<Expr*>(this)->IgnoreParenCasts(); 527 } 528 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 529 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 530 } 531 532 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 533 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 534 535 static bool classof(const Stmt *T) { 536 return T->getStmtClass() >= firstExprConstant && 537 T->getStmtClass() <= lastExprConstant; 538 } 539 static bool classof(const Expr *) { return true; } 540}; 541 542 543//===----------------------------------------------------------------------===// 544// Primary Expressions. 545//===----------------------------------------------------------------------===// 546 547/// OpaqueValueExpr - An expression referring to an opaque object of a 548/// fixed type and value class. These don't correspond to concrete 549/// syntax; instead they're used to express operations (usually copy 550/// operations) on values whose source is generally obvious from 551/// context. 552class OpaqueValueExpr : public Expr { 553 friend class ASTStmtReader; 554 Expr *SourceExpr; 555 SourceLocation Loc; 556 557public: 558 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK, 559 ExprObjectKind OK = OK_Ordinary) 560 : Expr(OpaqueValueExprClass, T, VK, OK, 561 T->isDependentType(), T->isDependentType(), false), 562 SourceExpr(0), Loc(Loc) { 563 } 564 565 /// Given an expression which invokes a copy constructor --- i.e. a 566 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups --- 567 /// find the OpaqueValueExpr that's the source of the construction. 568 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr); 569 570 explicit OpaqueValueExpr(EmptyShell Empty) 571 : Expr(OpaqueValueExprClass, Empty) { } 572 573 /// \brief Retrieve the location of this expression. 574 SourceLocation getLocation() const { return Loc; } 575 576 SourceRange getSourceRange() const { 577 if (SourceExpr) return SourceExpr->getSourceRange(); 578 return Loc; 579 } 580 SourceLocation getExprLoc() const { 581 if (SourceExpr) return SourceExpr->getExprLoc(); 582 return Loc; 583 } 584 585 child_range children() { return child_range(); } 586 587 /// The source expression of an opaque value expression is the 588 /// expression which originally generated the value. This is 589 /// provided as a convenience for analyses that don't wish to 590 /// precisely model the execution behavior of the program. 591 /// 592 /// The source expression is typically set when building the 593 /// expression which binds the opaque value expression in the first 594 /// place. 595 Expr *getSourceExpr() const { return SourceExpr; } 596 void setSourceExpr(Expr *e) { SourceExpr = e; } 597 598 static bool classof(const Stmt *T) { 599 return T->getStmtClass() == OpaqueValueExprClass; 600 } 601 static bool classof(const OpaqueValueExpr *) { return true; } 602}; 603 604/// \brief Represents the qualifier that may precede a C++ name, e.g., the 605/// "std::" in "std::sort". 606struct NameQualifier { 607 /// \brief The nested name specifier. 608 NestedNameSpecifier *NNS; 609 610 /// \brief The source range covered by the nested name specifier. 611 SourceRange Range; 612}; 613 614/// \brief Represents an explicit template argument list in C++, e.g., 615/// the "<int>" in "sort<int>". 616struct ExplicitTemplateArgumentList { 617 /// \brief The source location of the left angle bracket ('<'); 618 SourceLocation LAngleLoc; 619 620 /// \brief The source location of the right angle bracket ('>'); 621 SourceLocation RAngleLoc; 622 623 /// \brief The number of template arguments in TemplateArgs. 624 /// The actual template arguments (if any) are stored after the 625 /// ExplicitTemplateArgumentList structure. 626 unsigned NumTemplateArgs; 627 628 /// \brief Retrieve the template arguments 629 TemplateArgumentLoc *getTemplateArgs() { 630 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 631 } 632 633 /// \brief Retrieve the template arguments 634 const TemplateArgumentLoc *getTemplateArgs() const { 635 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 636 } 637 638 void initializeFrom(const TemplateArgumentListInfo &List); 639 void initializeFrom(const TemplateArgumentListInfo &List, 640 bool &Dependent, bool &ContainsUnexpandedParameterPack); 641 void copyInto(TemplateArgumentListInfo &List) const; 642 static std::size_t sizeFor(unsigned NumTemplateArgs); 643 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 644}; 645 646/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 647/// enum, etc. 648class DeclRefExpr : public Expr { 649 enum { 650 // Flag on DecoratedD that specifies when this declaration reference 651 // expression has a C++ nested-name-specifier. 652 HasQualifierFlag = 0x01, 653 // Flag on DecoratedD that specifies when this declaration reference 654 // expression has an explicit C++ template argument list. 655 HasExplicitTemplateArgumentListFlag = 0x02 656 }; 657 658 // DecoratedD - The declaration that we are referencing, plus two bits to 659 // indicate whether (1) the declaration's name was explicitly qualified and 660 // (2) the declaration's name was followed by an explicit template 661 // argument list. 662 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 663 664 // Loc - The location of the declaration name itself. 665 SourceLocation Loc; 666 667 /// DNLoc - Provides source/type location info for the 668 /// declaration name embedded in DecoratedD. 669 DeclarationNameLoc DNLoc; 670 671 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 672 NameQualifier *getNameQualifier() { 673 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 674 return 0; 675 676 return reinterpret_cast<NameQualifier *> (this + 1); 677 } 678 679 /// \brief Retrieve the qualifier that preceded the member name, if any. 680 const NameQualifier *getNameQualifier() const { 681 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 682 } 683 684 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 685 ValueDecl *D, SourceLocation NameLoc, 686 const TemplateArgumentListInfo *TemplateArgs, 687 QualType T, ExprValueKind VK); 688 689 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 690 ValueDecl *D, const DeclarationNameInfo &NameInfo, 691 const TemplateArgumentListInfo *TemplateArgs, 692 QualType T, ExprValueKind VK); 693 694 /// \brief Construct an empty declaration reference expression. 695 explicit DeclRefExpr(EmptyShell Empty) 696 : Expr(DeclRefExprClass, Empty) { } 697 698 /// \brief Computes the type- and value-dependence flags for this 699 /// declaration reference expression. 700 void computeDependence(); 701 702public: 703 DeclRefExpr(ValueDecl *d, QualType t, ExprValueKind VK, SourceLocation l) : 704 Expr(DeclRefExprClass, t, VK, OK_Ordinary, false, false, false), 705 DecoratedD(d, 0), Loc(l) { 706 computeDependence(); 707 } 708 709 static DeclRefExpr *Create(ASTContext &Context, 710 NestedNameSpecifier *Qualifier, 711 SourceRange QualifierRange, 712 ValueDecl *D, 713 SourceLocation NameLoc, 714 QualType T, ExprValueKind VK, 715 const TemplateArgumentListInfo *TemplateArgs = 0); 716 717 static DeclRefExpr *Create(ASTContext &Context, 718 NestedNameSpecifier *Qualifier, 719 SourceRange QualifierRange, 720 ValueDecl *D, 721 const DeclarationNameInfo &NameInfo, 722 QualType T, ExprValueKind VK, 723 const TemplateArgumentListInfo *TemplateArgs = 0); 724 725 /// \brief Construct an empty declaration reference expression. 726 static DeclRefExpr *CreateEmpty(ASTContext &Context, 727 bool HasQualifier, 728 bool HasExplicitTemplateArgs, 729 unsigned NumTemplateArgs); 730 731 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 732 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 733 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 734 735 DeclarationNameInfo getNameInfo() const { 736 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 737 } 738 739 SourceLocation getLocation() const { return Loc; } 740 void setLocation(SourceLocation L) { Loc = L; } 741 SourceRange getSourceRange() const; 742 743 /// \brief Determine whether this declaration reference was preceded by a 744 /// C++ nested-name-specifier, e.g., \c N::foo. 745 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 746 747 /// \brief If the name was qualified, retrieves the source range of 748 /// the nested-name-specifier that precedes the name. Otherwise, 749 /// returns an empty source range. 750 SourceRange getQualifierRange() const { 751 if (!hasQualifier()) 752 return SourceRange(); 753 754 return getNameQualifier()->Range; 755 } 756 757 /// \brief If the name was qualified, retrieves the nested-name-specifier 758 /// that precedes the name. Otherwise, returns NULL. 759 NestedNameSpecifier *getQualifier() const { 760 if (!hasQualifier()) 761 return 0; 762 763 return getNameQualifier()->NNS; 764 } 765 766 bool hasExplicitTemplateArgs() const { 767 return (DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag); 768 } 769 770 /// \brief Retrieve the explicit template argument list that followed the 771 /// member template name. 772 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 773 assert(hasExplicitTemplateArgs()); 774 775 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 776 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 777 778 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 779 getNameQualifier() + 1); 780 } 781 782 /// \brief Retrieve the explicit template argument list that followed the 783 /// member template name. 784 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 785 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 786 } 787 788 /// \brief Retrieves the optional explicit template arguments. 789 /// This points to the same data as getExplicitTemplateArgs(), but 790 /// returns null if there are no explicit template arguments. 791 const ExplicitTemplateArgumentList *getExplicitTemplateArgsOpt() const { 792 if (!hasExplicitTemplateArgs()) return 0; 793 return &getExplicitTemplateArgs(); 794 } 795 796 /// \brief Copies the template arguments (if present) into the given 797 /// structure. 798 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 799 if (hasExplicitTemplateArgs()) 800 getExplicitTemplateArgs().copyInto(List); 801 } 802 803 /// \brief Retrieve the location of the left angle bracket following the 804 /// member name ('<'), if any. 805 SourceLocation getLAngleLoc() const { 806 if (!hasExplicitTemplateArgs()) 807 return SourceLocation(); 808 809 return getExplicitTemplateArgs().LAngleLoc; 810 } 811 812 /// \brief Retrieve the template arguments provided as part of this 813 /// template-id. 814 const TemplateArgumentLoc *getTemplateArgs() const { 815 if (!hasExplicitTemplateArgs()) 816 return 0; 817 818 return getExplicitTemplateArgs().getTemplateArgs(); 819 } 820 821 /// \brief Retrieve the number of template arguments provided as part of this 822 /// template-id. 823 unsigned getNumTemplateArgs() const { 824 if (!hasExplicitTemplateArgs()) 825 return 0; 826 827 return getExplicitTemplateArgs().NumTemplateArgs; 828 } 829 830 /// \brief Retrieve the location of the right angle bracket following the 831 /// template arguments ('>'). 832 SourceLocation getRAngleLoc() const { 833 if (!hasExplicitTemplateArgs()) 834 return SourceLocation(); 835 836 return getExplicitTemplateArgs().RAngleLoc; 837 } 838 839 static bool classof(const Stmt *T) { 840 return T->getStmtClass() == DeclRefExprClass; 841 } 842 static bool classof(const DeclRefExpr *) { return true; } 843 844 // Iterators 845 child_range children() { return child_range(); } 846 847 friend class ASTStmtReader; 848 friend class ASTStmtWriter; 849}; 850 851/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 852class PredefinedExpr : public Expr { 853public: 854 enum IdentType { 855 Func, 856 Function, 857 PrettyFunction, 858 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 859 /// 'virtual' keyword is omitted for virtual member functions. 860 PrettyFunctionNoVirtual 861 }; 862 863private: 864 SourceLocation Loc; 865 IdentType Type; 866public: 867 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 868 : Expr(PredefinedExprClass, type, VK_LValue, OK_Ordinary, 869 type->isDependentType(), type->isDependentType(), 870 /*ContainsUnexpandedParameterPack=*/false), 871 Loc(l), Type(IT) {} 872 873 /// \brief Construct an empty predefined expression. 874 explicit PredefinedExpr(EmptyShell Empty) 875 : Expr(PredefinedExprClass, Empty) { } 876 877 IdentType getIdentType() const { return Type; } 878 void setIdentType(IdentType IT) { Type = IT; } 879 880 SourceLocation getLocation() const { return Loc; } 881 void setLocation(SourceLocation L) { Loc = L; } 882 883 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 884 885 SourceRange getSourceRange() const { return SourceRange(Loc); } 886 887 static bool classof(const Stmt *T) { 888 return T->getStmtClass() == PredefinedExprClass; 889 } 890 static bool classof(const PredefinedExpr *) { return true; } 891 892 // Iterators 893 child_range children() { return child_range(); } 894}; 895 896/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 897/// leaking memory. 898/// 899/// For large floats/integers, APFloat/APInt will allocate memory from the heap 900/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 901/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 902/// the APFloat/APInt values will never get freed. APNumericStorage uses 903/// ASTContext's allocator for memory allocation. 904class APNumericStorage { 905 unsigned BitWidth; 906 union { 907 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 908 uint64_t *pVal; ///< Used to store the >64 bits integer value. 909 }; 910 911 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 912 913 APNumericStorage(const APNumericStorage&); // do not implement 914 APNumericStorage& operator=(const APNumericStorage&); // do not implement 915 916protected: 917 APNumericStorage() : BitWidth(0), VAL(0) { } 918 919 llvm::APInt getIntValue() const { 920 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 921 if (NumWords > 1) 922 return llvm::APInt(BitWidth, NumWords, pVal); 923 else 924 return llvm::APInt(BitWidth, VAL); 925 } 926 void setIntValue(ASTContext &C, const llvm::APInt &Val); 927}; 928 929class APIntStorage : public APNumericStorage { 930public: 931 llvm::APInt getValue() const { return getIntValue(); } 932 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 933}; 934 935class APFloatStorage : public APNumericStorage { 936public: 937 llvm::APFloat getValue() const { return llvm::APFloat(getIntValue()); } 938 void setValue(ASTContext &C, const llvm::APFloat &Val) { 939 setIntValue(C, Val.bitcastToAPInt()); 940 } 941}; 942 943class IntegerLiteral : public Expr { 944 APIntStorage Num; 945 SourceLocation Loc; 946 947 /// \brief Construct an empty integer literal. 948 explicit IntegerLiteral(EmptyShell Empty) 949 : Expr(IntegerLiteralClass, Empty) { } 950 951public: 952 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 953 // or UnsignedLongLongTy 954 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 955 QualType type, SourceLocation l) 956 : Expr(IntegerLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 957 false), 958 Loc(l) { 959 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 960 setValue(C, V); 961 } 962 963 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 964 // or UnsignedLongLongTy 965 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 966 QualType type, SourceLocation l); 967 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 968 969 llvm::APInt getValue() const { return Num.getValue(); } 970 SourceRange getSourceRange() const { return SourceRange(Loc); } 971 972 /// \brief Retrieve the location of the literal. 973 SourceLocation getLocation() const { return Loc; } 974 975 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 976 void setLocation(SourceLocation Location) { Loc = Location; } 977 978 static bool classof(const Stmt *T) { 979 return T->getStmtClass() == IntegerLiteralClass; 980 } 981 static bool classof(const IntegerLiteral *) { return true; } 982 983 // Iterators 984 child_range children() { return child_range(); } 985}; 986 987class CharacterLiteral : public Expr { 988 unsigned Value; 989 SourceLocation Loc; 990 bool IsWide; 991public: 992 // type should be IntTy 993 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 994 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary, false, false, 995 false), 996 Value(value), Loc(l), IsWide(iswide) { 997 } 998 999 /// \brief Construct an empty character literal. 1000 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 1001 1002 SourceLocation getLocation() const { return Loc; } 1003 bool isWide() const { return IsWide; } 1004 1005 SourceRange getSourceRange() const { return SourceRange(Loc); } 1006 1007 unsigned getValue() const { return Value; } 1008 1009 void setLocation(SourceLocation Location) { Loc = Location; } 1010 void setWide(bool W) { IsWide = W; } 1011 void setValue(unsigned Val) { Value = Val; } 1012 1013 static bool classof(const Stmt *T) { 1014 return T->getStmtClass() == CharacterLiteralClass; 1015 } 1016 static bool classof(const CharacterLiteral *) { return true; } 1017 1018 // Iterators 1019 child_range children() { return child_range(); } 1020}; 1021 1022class FloatingLiteral : public Expr { 1023 APFloatStorage Num; 1024 bool IsExact : 1; 1025 SourceLocation Loc; 1026 1027 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 1028 QualType Type, SourceLocation L) 1029 : Expr(FloatingLiteralClass, Type, VK_RValue, OK_Ordinary, false, false, 1030 false), 1031 IsExact(isexact), Loc(L) { 1032 setValue(C, V); 1033 } 1034 1035 /// \brief Construct an empty floating-point literal. 1036 explicit FloatingLiteral(EmptyShell Empty) 1037 : Expr(FloatingLiteralClass, Empty), IsExact(false) { } 1038 1039public: 1040 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 1041 bool isexact, QualType Type, SourceLocation L); 1042 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 1043 1044 llvm::APFloat getValue() const { return Num.getValue(); } 1045 void setValue(ASTContext &C, const llvm::APFloat &Val) { 1046 Num.setValue(C, Val); 1047 } 1048 1049 bool isExact() const { return IsExact; } 1050 void setExact(bool E) { IsExact = E; } 1051 1052 /// getValueAsApproximateDouble - This returns the value as an inaccurate 1053 /// double. Note that this may cause loss of precision, but is useful for 1054 /// debugging dumps, etc. 1055 double getValueAsApproximateDouble() const; 1056 1057 SourceLocation getLocation() const { return Loc; } 1058 void setLocation(SourceLocation L) { Loc = L; } 1059 1060 SourceRange getSourceRange() const { return SourceRange(Loc); } 1061 1062 static bool classof(const Stmt *T) { 1063 return T->getStmtClass() == FloatingLiteralClass; 1064 } 1065 static bool classof(const FloatingLiteral *) { return true; } 1066 1067 // Iterators 1068 child_range children() { return child_range(); } 1069}; 1070 1071/// ImaginaryLiteral - We support imaginary integer and floating point literals, 1072/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 1073/// IntegerLiteral classes. Instances of this class always have a Complex type 1074/// whose element type matches the subexpression. 1075/// 1076class ImaginaryLiteral : public Expr { 1077 Stmt *Val; 1078public: 1079 ImaginaryLiteral(Expr *val, QualType Ty) 1080 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary, false, false, 1081 false), 1082 Val(val) {} 1083 1084 /// \brief Build an empty imaginary literal. 1085 explicit ImaginaryLiteral(EmptyShell Empty) 1086 : Expr(ImaginaryLiteralClass, Empty) { } 1087 1088 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1089 Expr *getSubExpr() { return cast<Expr>(Val); } 1090 void setSubExpr(Expr *E) { Val = E; } 1091 1092 SourceRange getSourceRange() const { return Val->getSourceRange(); } 1093 static bool classof(const Stmt *T) { 1094 return T->getStmtClass() == ImaginaryLiteralClass; 1095 } 1096 static bool classof(const ImaginaryLiteral *) { return true; } 1097 1098 // Iterators 1099 child_range children() { return child_range(&Val, &Val+1); } 1100}; 1101 1102/// StringLiteral - This represents a string literal expression, e.g. "foo" 1103/// or L"bar" (wide strings). The actual string is returned by getStrData() 1104/// is NOT null-terminated, and the length of the string is determined by 1105/// calling getByteLength(). The C type for a string is always a 1106/// ConstantArrayType. In C++, the char type is const qualified, in C it is 1107/// not. 1108/// 1109/// Note that strings in C can be formed by concatenation of multiple string 1110/// literal pptokens in translation phase #6. This keeps track of the locations 1111/// of each of these pieces. 1112/// 1113/// Strings in C can also be truncated and extended by assigning into arrays, 1114/// e.g. with constructs like: 1115/// char X[2] = "foobar"; 1116/// In this case, getByteLength() will return 6, but the string literal will 1117/// have type "char[2]". 1118class StringLiteral : public Expr { 1119 const char *StrData; 1120 unsigned ByteLength; 1121 bool IsWide; 1122 unsigned NumConcatenated; 1123 SourceLocation TokLocs[1]; 1124 1125 StringLiteral(QualType Ty) : 1126 Expr(StringLiteralClass, Ty, VK_LValue, OK_Ordinary, false, false, false) {} 1127 1128public: 1129 /// This is the "fully general" constructor that allows representation of 1130 /// strings formed from multiple concatenated tokens. 1131 static StringLiteral *Create(ASTContext &C, const char *StrData, 1132 unsigned ByteLength, bool Wide, QualType Ty, 1133 const SourceLocation *Loc, unsigned NumStrs); 1134 1135 /// Simple constructor for string literals made from one token. 1136 static StringLiteral *Create(ASTContext &C, const char *StrData, 1137 unsigned ByteLength, 1138 bool Wide, QualType Ty, SourceLocation Loc) { 1139 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 1140 } 1141 1142 /// \brief Construct an empty string literal. 1143 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1144 1145 llvm::StringRef getString() const { 1146 return llvm::StringRef(StrData, ByteLength); 1147 } 1148 1149 unsigned getByteLength() const { return ByteLength; } 1150 1151 /// \brief Sets the string data to the given string data. 1152 void setString(ASTContext &C, llvm::StringRef Str); 1153 1154 bool isWide() const { return IsWide; } 1155 void setWide(bool W) { IsWide = W; } 1156 1157 bool containsNonAsciiOrNull() const { 1158 llvm::StringRef Str = getString(); 1159 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1160 if (!isascii(Str[i]) || !Str[i]) 1161 return true; 1162 return false; 1163 } 1164 /// getNumConcatenated - Get the number of string literal tokens that were 1165 /// concatenated in translation phase #6 to form this string literal. 1166 unsigned getNumConcatenated() const { return NumConcatenated; } 1167 1168 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1169 assert(TokNum < NumConcatenated && "Invalid tok number"); 1170 return TokLocs[TokNum]; 1171 } 1172 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1173 assert(TokNum < NumConcatenated && "Invalid tok number"); 1174 TokLocs[TokNum] = L; 1175 } 1176 1177 /// getLocationOfByte - Return a source location that points to the specified 1178 /// byte of this string literal. 1179 /// 1180 /// Strings are amazingly complex. They can be formed from multiple tokens 1181 /// and can have escape sequences in them in addition to the usual trigraph 1182 /// and escaped newline business. This routine handles this complexity. 1183 /// 1184 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1185 const LangOptions &Features, 1186 const TargetInfo &Target) const; 1187 1188 typedef const SourceLocation *tokloc_iterator; 1189 tokloc_iterator tokloc_begin() const { return TokLocs; } 1190 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1191 1192 SourceRange getSourceRange() const { 1193 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1194 } 1195 static bool classof(const Stmt *T) { 1196 return T->getStmtClass() == StringLiteralClass; 1197 } 1198 static bool classof(const StringLiteral *) { return true; } 1199 1200 // Iterators 1201 child_range children() { return child_range(); } 1202}; 1203 1204/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1205/// AST node is only formed if full location information is requested. 1206class ParenExpr : public Expr { 1207 SourceLocation L, R; 1208 Stmt *Val; 1209public: 1210 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1211 : Expr(ParenExprClass, val->getType(), 1212 val->getValueKind(), val->getObjectKind(), 1213 val->isTypeDependent(), val->isValueDependent(), 1214 val->containsUnexpandedParameterPack()), 1215 L(l), R(r), Val(val) {} 1216 1217 /// \brief Construct an empty parenthesized expression. 1218 explicit ParenExpr(EmptyShell Empty) 1219 : Expr(ParenExprClass, Empty) { } 1220 1221 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1222 Expr *getSubExpr() { return cast<Expr>(Val); } 1223 void setSubExpr(Expr *E) { Val = E; } 1224 1225 SourceRange getSourceRange() const { return SourceRange(L, R); } 1226 1227 /// \brief Get the location of the left parentheses '('. 1228 SourceLocation getLParen() const { return L; } 1229 void setLParen(SourceLocation Loc) { L = Loc; } 1230 1231 /// \brief Get the location of the right parentheses ')'. 1232 SourceLocation getRParen() const { return R; } 1233 void setRParen(SourceLocation Loc) { R = Loc; } 1234 1235 static bool classof(const Stmt *T) { 1236 return T->getStmtClass() == ParenExprClass; 1237 } 1238 static bool classof(const ParenExpr *) { return true; } 1239 1240 // Iterators 1241 child_range children() { return child_range(&Val, &Val+1); } 1242}; 1243 1244 1245/// UnaryOperator - This represents the unary-expression's (except sizeof and 1246/// alignof), the postinc/postdec operators from postfix-expression, and various 1247/// extensions. 1248/// 1249/// Notes on various nodes: 1250/// 1251/// Real/Imag - These return the real/imag part of a complex operand. If 1252/// applied to a non-complex value, the former returns its operand and the 1253/// later returns zero in the type of the operand. 1254/// 1255class UnaryOperator : public Expr { 1256public: 1257 typedef UnaryOperatorKind Opcode; 1258 1259private: 1260 unsigned Opc : 5; 1261 SourceLocation Loc; 1262 Stmt *Val; 1263public: 1264 1265 UnaryOperator(Expr *input, Opcode opc, QualType type, 1266 ExprValueKind VK, ExprObjectKind OK, SourceLocation l) 1267 : Expr(UnaryOperatorClass, type, VK, OK, 1268 input->isTypeDependent() || type->isDependentType(), 1269 input->isValueDependent(), 1270 input->containsUnexpandedParameterPack()), 1271 Opc(opc), Loc(l), Val(input) {} 1272 1273 /// \brief Build an empty unary operator. 1274 explicit UnaryOperator(EmptyShell Empty) 1275 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1276 1277 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1278 void setOpcode(Opcode O) { Opc = O; } 1279 1280 Expr *getSubExpr() const { return cast<Expr>(Val); } 1281 void setSubExpr(Expr *E) { Val = E; } 1282 1283 /// getOperatorLoc - Return the location of the operator. 1284 SourceLocation getOperatorLoc() const { return Loc; } 1285 void setOperatorLoc(SourceLocation L) { Loc = L; } 1286 1287 /// isPostfix - Return true if this is a postfix operation, like x++. 1288 static bool isPostfix(Opcode Op) { 1289 return Op == UO_PostInc || Op == UO_PostDec; 1290 } 1291 1292 /// isPrefix - Return true if this is a prefix operation, like --x. 1293 static bool isPrefix(Opcode Op) { 1294 return Op == UO_PreInc || Op == UO_PreDec; 1295 } 1296 1297 bool isPrefix() const { return isPrefix(getOpcode()); } 1298 bool isPostfix() const { return isPostfix(getOpcode()); } 1299 bool isIncrementOp() const { 1300 return Opc == UO_PreInc || Opc == UO_PostInc; 1301 } 1302 bool isIncrementDecrementOp() const { 1303 return Opc <= UO_PreDec; 1304 } 1305 static bool isArithmeticOp(Opcode Op) { 1306 return Op >= UO_Plus && Op <= UO_LNot; 1307 } 1308 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1309 1310 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1311 /// corresponds to, e.g. "sizeof" or "[pre]++" 1312 static const char *getOpcodeStr(Opcode Op); 1313 1314 /// \brief Retrieve the unary opcode that corresponds to the given 1315 /// overloaded operator. 1316 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1317 1318 /// \brief Retrieve the overloaded operator kind that corresponds to 1319 /// the given unary opcode. 1320 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1321 1322 SourceRange getSourceRange() const { 1323 if (isPostfix()) 1324 return SourceRange(Val->getLocStart(), Loc); 1325 else 1326 return SourceRange(Loc, Val->getLocEnd()); 1327 } 1328 SourceLocation getExprLoc() const { return Loc; } 1329 1330 static bool classof(const Stmt *T) { 1331 return T->getStmtClass() == UnaryOperatorClass; 1332 } 1333 static bool classof(const UnaryOperator *) { return true; } 1334 1335 // Iterators 1336 child_range children() { return child_range(&Val, &Val+1); } 1337}; 1338 1339/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1340/// offsetof(record-type, member-designator). For example, given: 1341/// @code 1342/// struct S { 1343/// float f; 1344/// double d; 1345/// }; 1346/// struct T { 1347/// int i; 1348/// struct S s[10]; 1349/// }; 1350/// @endcode 1351/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1352 1353class OffsetOfExpr : public Expr { 1354public: 1355 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1356 class OffsetOfNode { 1357 public: 1358 /// \brief The kind of offsetof node we have. 1359 enum Kind { 1360 /// \brief An index into an array. 1361 Array = 0x00, 1362 /// \brief A field. 1363 Field = 0x01, 1364 /// \brief A field in a dependent type, known only by its name. 1365 Identifier = 0x02, 1366 /// \brief An implicit indirection through a C++ base class, when the 1367 /// field found is in a base class. 1368 Base = 0x03 1369 }; 1370 1371 private: 1372 enum { MaskBits = 2, Mask = 0x03 }; 1373 1374 /// \brief The source range that covers this part of the designator. 1375 SourceRange Range; 1376 1377 /// \brief The data describing the designator, which comes in three 1378 /// different forms, depending on the lower two bits. 1379 /// - An unsigned index into the array of Expr*'s stored after this node 1380 /// in memory, for [constant-expression] designators. 1381 /// - A FieldDecl*, for references to a known field. 1382 /// - An IdentifierInfo*, for references to a field with a given name 1383 /// when the class type is dependent. 1384 /// - A CXXBaseSpecifier*, for references that look at a field in a 1385 /// base class. 1386 uintptr_t Data; 1387 1388 public: 1389 /// \brief Create an offsetof node that refers to an array element. 1390 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1391 SourceLocation RBracketLoc) 1392 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1393 1394 /// \brief Create an offsetof node that refers to a field. 1395 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1396 SourceLocation NameLoc) 1397 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1398 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1399 1400 /// \brief Create an offsetof node that refers to an identifier. 1401 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1402 SourceLocation NameLoc) 1403 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1404 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1405 1406 /// \brief Create an offsetof node that refers into a C++ base class. 1407 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1408 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1409 1410 /// \brief Determine what kind of offsetof node this is. 1411 Kind getKind() const { 1412 return static_cast<Kind>(Data & Mask); 1413 } 1414 1415 /// \brief For an array element node, returns the index into the array 1416 /// of expressions. 1417 unsigned getArrayExprIndex() const { 1418 assert(getKind() == Array); 1419 return Data >> 2; 1420 } 1421 1422 /// \brief For a field offsetof node, returns the field. 1423 FieldDecl *getField() const { 1424 assert(getKind() == Field); 1425 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1426 } 1427 1428 /// \brief For a field or identifier offsetof node, returns the name of 1429 /// the field. 1430 IdentifierInfo *getFieldName() const; 1431 1432 /// \brief For a base class node, returns the base specifier. 1433 CXXBaseSpecifier *getBase() const { 1434 assert(getKind() == Base); 1435 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1436 } 1437 1438 /// \brief Retrieve the source range that covers this offsetof node. 1439 /// 1440 /// For an array element node, the source range contains the locations of 1441 /// the square brackets. For a field or identifier node, the source range 1442 /// contains the location of the period (if there is one) and the 1443 /// identifier. 1444 SourceRange getRange() const { return Range; } 1445 }; 1446 1447private: 1448 1449 SourceLocation OperatorLoc, RParenLoc; 1450 // Base type; 1451 TypeSourceInfo *TSInfo; 1452 // Number of sub-components (i.e. instances of OffsetOfNode). 1453 unsigned NumComps; 1454 // Number of sub-expressions (i.e. array subscript expressions). 1455 unsigned NumExprs; 1456 1457 OffsetOfExpr(ASTContext &C, QualType type, 1458 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1459 OffsetOfNode* compsPtr, unsigned numComps, 1460 Expr** exprsPtr, unsigned numExprs, 1461 SourceLocation RParenLoc); 1462 1463 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1464 : Expr(OffsetOfExprClass, EmptyShell()), 1465 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1466 1467public: 1468 1469 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1470 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1471 OffsetOfNode* compsPtr, unsigned numComps, 1472 Expr** exprsPtr, unsigned numExprs, 1473 SourceLocation RParenLoc); 1474 1475 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1476 unsigned NumComps, unsigned NumExprs); 1477 1478 /// getOperatorLoc - Return the location of the operator. 1479 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1480 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1481 1482 /// \brief Return the location of the right parentheses. 1483 SourceLocation getRParenLoc() const { return RParenLoc; } 1484 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1485 1486 TypeSourceInfo *getTypeSourceInfo() const { 1487 return TSInfo; 1488 } 1489 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1490 TSInfo = tsi; 1491 } 1492 1493 const OffsetOfNode &getComponent(unsigned Idx) { 1494 assert(Idx < NumComps && "Subscript out of range"); 1495 return reinterpret_cast<OffsetOfNode *> (this + 1)[Idx]; 1496 } 1497 1498 void setComponent(unsigned Idx, OffsetOfNode ON) { 1499 assert(Idx < NumComps && "Subscript out of range"); 1500 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1501 } 1502 1503 unsigned getNumComponents() const { 1504 return NumComps; 1505 } 1506 1507 Expr* getIndexExpr(unsigned Idx) { 1508 assert(Idx < NumExprs && "Subscript out of range"); 1509 return reinterpret_cast<Expr **>( 1510 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1511 } 1512 1513 void setIndexExpr(unsigned Idx, Expr* E) { 1514 assert(Idx < NumComps && "Subscript out of range"); 1515 reinterpret_cast<Expr **>( 1516 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1517 } 1518 1519 unsigned getNumExpressions() const { 1520 return NumExprs; 1521 } 1522 1523 SourceRange getSourceRange() const { 1524 return SourceRange(OperatorLoc, RParenLoc); 1525 } 1526 1527 static bool classof(const Stmt *T) { 1528 return T->getStmtClass() == OffsetOfExprClass; 1529 } 1530 1531 static bool classof(const OffsetOfExpr *) { return true; } 1532 1533 // Iterators 1534 child_range children() { 1535 Stmt **begin = 1536 reinterpret_cast<Stmt**>(reinterpret_cast<OffsetOfNode*>(this + 1) 1537 + NumComps); 1538 return child_range(begin, begin + NumExprs); 1539 } 1540}; 1541 1542/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1543/// types and expressions. 1544class SizeOfAlignOfExpr : public Expr { 1545 bool isSizeof : 1; // true if sizeof, false if alignof. 1546 bool isType : 1; // true if operand is a type, false if an expression 1547 union { 1548 TypeSourceInfo *Ty; 1549 Stmt *Ex; 1550 } Argument; 1551 SourceLocation OpLoc, RParenLoc; 1552 1553public: 1554 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 1555 QualType resultType, SourceLocation op, 1556 SourceLocation rp) : 1557 Expr(SizeOfAlignOfExprClass, resultType, VK_RValue, OK_Ordinary, 1558 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1559 // Value-dependent if the argument is type-dependent. 1560 TInfo->getType()->isDependentType(), 1561 TInfo->getType()->containsUnexpandedParameterPack()), 1562 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1563 Argument.Ty = TInfo; 1564 } 1565 1566 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1567 QualType resultType, SourceLocation op, 1568 SourceLocation rp) : 1569 Expr(SizeOfAlignOfExprClass, resultType, VK_RValue, OK_Ordinary, 1570 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1571 // Value-dependent if the argument is type-dependent. 1572 E->isTypeDependent(), 1573 E->containsUnexpandedParameterPack()), 1574 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1575 Argument.Ex = E; 1576 } 1577 1578 /// \brief Construct an empty sizeof/alignof expression. 1579 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1580 : Expr(SizeOfAlignOfExprClass, Empty) { } 1581 1582 bool isSizeOf() const { return isSizeof; } 1583 void setSizeof(bool S) { isSizeof = S; } 1584 1585 bool isArgumentType() const { return isType; } 1586 QualType getArgumentType() const { 1587 return getArgumentTypeInfo()->getType(); 1588 } 1589 TypeSourceInfo *getArgumentTypeInfo() const { 1590 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1591 return Argument.Ty; 1592 } 1593 Expr *getArgumentExpr() { 1594 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1595 return static_cast<Expr*>(Argument.Ex); 1596 } 1597 const Expr *getArgumentExpr() const { 1598 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1599 } 1600 1601 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1602 void setArgument(TypeSourceInfo *TInfo) { 1603 Argument.Ty = TInfo; 1604 isType = true; 1605 } 1606 1607 /// Gets the argument type, or the type of the argument expression, whichever 1608 /// is appropriate. 1609 QualType getTypeOfArgument() const { 1610 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1611 } 1612 1613 SourceLocation getOperatorLoc() const { return OpLoc; } 1614 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1615 1616 SourceLocation getRParenLoc() const { return RParenLoc; } 1617 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1618 1619 SourceRange getSourceRange() const { 1620 return SourceRange(OpLoc, RParenLoc); 1621 } 1622 1623 static bool classof(const Stmt *T) { 1624 return T->getStmtClass() == SizeOfAlignOfExprClass; 1625 } 1626 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1627 1628 // Iterators 1629 child_range children(); 1630}; 1631 1632//===----------------------------------------------------------------------===// 1633// Postfix Operators. 1634//===----------------------------------------------------------------------===// 1635 1636/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1637class ArraySubscriptExpr : public Expr { 1638 enum { LHS, RHS, END_EXPR=2 }; 1639 Stmt* SubExprs[END_EXPR]; 1640 SourceLocation RBracketLoc; 1641public: 1642 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1643 ExprValueKind VK, ExprObjectKind OK, 1644 SourceLocation rbracketloc) 1645 : Expr(ArraySubscriptExprClass, t, VK, OK, 1646 lhs->isTypeDependent() || rhs->isTypeDependent(), 1647 lhs->isValueDependent() || rhs->isValueDependent(), 1648 (lhs->containsUnexpandedParameterPack() || 1649 rhs->containsUnexpandedParameterPack())), 1650 RBracketLoc(rbracketloc) { 1651 SubExprs[LHS] = lhs; 1652 SubExprs[RHS] = rhs; 1653 } 1654 1655 /// \brief Create an empty array subscript expression. 1656 explicit ArraySubscriptExpr(EmptyShell Shell) 1657 : Expr(ArraySubscriptExprClass, Shell) { } 1658 1659 /// An array access can be written A[4] or 4[A] (both are equivalent). 1660 /// - getBase() and getIdx() always present the normalized view: A[4]. 1661 /// In this case getBase() returns "A" and getIdx() returns "4". 1662 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1663 /// 4[A] getLHS() returns "4". 1664 /// Note: Because vector element access is also written A[4] we must 1665 /// predicate the format conversion in getBase and getIdx only on the 1666 /// the type of the RHS, as it is possible for the LHS to be a vector of 1667 /// integer type 1668 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1669 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1670 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1671 1672 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1673 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1674 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1675 1676 Expr *getBase() { 1677 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1678 } 1679 1680 const Expr *getBase() const { 1681 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1682 } 1683 1684 Expr *getIdx() { 1685 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1686 } 1687 1688 const Expr *getIdx() const { 1689 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1690 } 1691 1692 SourceRange getSourceRange() const { 1693 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1694 } 1695 1696 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1697 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1698 1699 SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1700 1701 static bool classof(const Stmt *T) { 1702 return T->getStmtClass() == ArraySubscriptExprClass; 1703 } 1704 static bool classof(const ArraySubscriptExpr *) { return true; } 1705 1706 // Iterators 1707 child_range children() { 1708 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 1709 } 1710}; 1711 1712 1713/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1714/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1715/// while its subclasses may represent alternative syntax that (semantically) 1716/// results in a function call. For example, CXXOperatorCallExpr is 1717/// a subclass for overloaded operator calls that use operator syntax, e.g., 1718/// "str1 + str2" to resolve to a function call. 1719class CallExpr : public Expr { 1720 enum { FN=0, PREARGS_START=1 }; 1721 Stmt **SubExprs; 1722 unsigned NumArgs; 1723 SourceLocation RParenLoc; 1724 1725protected: 1726 // These versions of the constructor are for derived classes. 1727 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, unsigned NumPreArgs, 1728 Expr **args, unsigned numargs, QualType t, ExprValueKind VK, 1729 SourceLocation rparenloc); 1730 CallExpr(ASTContext &C, StmtClass SC, unsigned NumPreArgs, EmptyShell Empty); 1731 1732 Stmt *getPreArg(unsigned i) { 1733 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1734 return SubExprs[PREARGS_START+i]; 1735 } 1736 const Stmt *getPreArg(unsigned i) const { 1737 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1738 return SubExprs[PREARGS_START+i]; 1739 } 1740 void setPreArg(unsigned i, Stmt *PreArg) { 1741 assert(i < getNumPreArgs() && "Prearg access out of range!"); 1742 SubExprs[PREARGS_START+i] = PreArg; 1743 } 1744 1745 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; } 1746 1747public: 1748 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1749 ExprValueKind VK, SourceLocation rparenloc); 1750 1751 /// \brief Build an empty call expression. 1752 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1753 1754 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1755 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1756 void setCallee(Expr *F) { SubExprs[FN] = F; } 1757 1758 Decl *getCalleeDecl(); 1759 const Decl *getCalleeDecl() const { 1760 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1761 } 1762 1763 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1764 FunctionDecl *getDirectCallee(); 1765 const FunctionDecl *getDirectCallee() const { 1766 return const_cast<CallExpr*>(this)->getDirectCallee(); 1767 } 1768 1769 /// getNumArgs - Return the number of actual arguments to this call. 1770 /// 1771 unsigned getNumArgs() const { return NumArgs; } 1772 1773 /// \brief Retrieve the call arguments. 1774 Expr **getArgs() { 1775 return reinterpret_cast<Expr **>(SubExprs+getNumPreArgs()+PREARGS_START); 1776 } 1777 1778 /// getArg - Return the specified argument. 1779 Expr *getArg(unsigned Arg) { 1780 assert(Arg < NumArgs && "Arg access out of range!"); 1781 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1782 } 1783 const Expr *getArg(unsigned Arg) const { 1784 assert(Arg < NumArgs && "Arg access out of range!"); 1785 return cast<Expr>(SubExprs[Arg+getNumPreArgs()+PREARGS_START]); 1786 } 1787 1788 /// setArg - Set the specified argument. 1789 void setArg(unsigned Arg, Expr *ArgExpr) { 1790 assert(Arg < NumArgs && "Arg access out of range!"); 1791 SubExprs[Arg+getNumPreArgs()+PREARGS_START] = ArgExpr; 1792 } 1793 1794 /// setNumArgs - This changes the number of arguments present in this call. 1795 /// Any orphaned expressions are deleted by this, and any new operands are set 1796 /// to null. 1797 void setNumArgs(ASTContext& C, unsigned NumArgs); 1798 1799 typedef ExprIterator arg_iterator; 1800 typedef ConstExprIterator const_arg_iterator; 1801 1802 arg_iterator arg_begin() { return SubExprs+PREARGS_START+getNumPreArgs(); } 1803 arg_iterator arg_end() { 1804 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1805 } 1806 const_arg_iterator arg_begin() const { 1807 return SubExprs+PREARGS_START+getNumPreArgs(); 1808 } 1809 const_arg_iterator arg_end() const { 1810 return SubExprs+PREARGS_START+getNumPreArgs()+getNumArgs(); 1811 } 1812 1813 /// getNumCommas - Return the number of commas that must have been present in 1814 /// this function call. 1815 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1816 1817 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1818 /// not, return 0. 1819 unsigned isBuiltinCall(const ASTContext &Context) const; 1820 1821 /// getCallReturnType - Get the return type of the call expr. This is not 1822 /// always the type of the expr itself, if the return type is a reference 1823 /// type. 1824 QualType getCallReturnType() const; 1825 1826 SourceLocation getRParenLoc() const { return RParenLoc; } 1827 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1828 1829 SourceRange getSourceRange() const { 1830 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1831 } 1832 1833 static bool classof(const Stmt *T) { 1834 return T->getStmtClass() >= firstCallExprConstant && 1835 T->getStmtClass() <= lastCallExprConstant; 1836 } 1837 static bool classof(const CallExpr *) { return true; } 1838 1839 // Iterators 1840 child_range children() { 1841 return child_range(&SubExprs[0], 1842 &SubExprs[0]+NumArgs+getNumPreArgs()+PREARGS_START); 1843 } 1844}; 1845 1846/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1847/// 1848class MemberExpr : public Expr { 1849 /// Extra data stored in some member expressions. 1850 struct MemberNameQualifier : public NameQualifier { 1851 DeclAccessPair FoundDecl; 1852 }; 1853 1854 /// Base - the expression for the base pointer or structure references. In 1855 /// X.F, this is "X". 1856 Stmt *Base; 1857 1858 /// MemberDecl - This is the decl being referenced by the field/member name. 1859 /// In X.F, this is the decl referenced by F. 1860 ValueDecl *MemberDecl; 1861 1862 /// MemberLoc - This is the location of the member name. 1863 SourceLocation MemberLoc; 1864 1865 /// MemberDNLoc - Provides source/type location info for the 1866 /// declaration name embedded in MemberDecl. 1867 DeclarationNameLoc MemberDNLoc; 1868 1869 /// IsArrow - True if this is "X->F", false if this is "X.F". 1870 bool IsArrow : 1; 1871 1872 /// \brief True if this member expression used a nested-name-specifier to 1873 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1874 /// declaration. When true, a MemberNameQualifier 1875 /// structure is allocated immediately after the MemberExpr. 1876 bool HasQualifierOrFoundDecl : 1; 1877 1878 /// \brief True if this member expression specified a template argument list 1879 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1880 /// structure (and its TemplateArguments) are allocated immediately after 1881 /// the MemberExpr or, if the member expression also has a qualifier, after 1882 /// the MemberNameQualifier structure. 1883 bool HasExplicitTemplateArgumentList : 1; 1884 1885 /// \brief Retrieve the qualifier that preceded the member name, if any. 1886 MemberNameQualifier *getMemberQualifier() { 1887 assert(HasQualifierOrFoundDecl); 1888 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1889 } 1890 1891 /// \brief Retrieve the qualifier that preceded the member name, if any. 1892 const MemberNameQualifier *getMemberQualifier() const { 1893 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1894 } 1895 1896public: 1897 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1898 const DeclarationNameInfo &NameInfo, QualType ty, 1899 ExprValueKind VK, ExprObjectKind OK) 1900 : Expr(MemberExprClass, ty, VK, OK, 1901 base->isTypeDependent(), base->isValueDependent(), 1902 base->containsUnexpandedParameterPack()), 1903 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 1904 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 1905 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) { 1906 assert(memberdecl->getDeclName() == NameInfo.getName()); 1907 } 1908 1909 // NOTE: this constructor should be used only when it is known that 1910 // the member name can not provide additional syntactic info 1911 // (i.e., source locations for C++ operator names or type source info 1912 // for constructors, destructors and conversion oeprators). 1913 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1914 SourceLocation l, QualType ty, 1915 ExprValueKind VK, ExprObjectKind OK) 1916 : Expr(MemberExprClass, ty, VK, OK, 1917 base->isTypeDependent(), base->isValueDependent(), 1918 base->containsUnexpandedParameterPack()), 1919 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 1920 IsArrow(isarrow), 1921 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1922 1923 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1924 NestedNameSpecifier *qual, SourceRange qualrange, 1925 ValueDecl *memberdecl, DeclAccessPair founddecl, 1926 DeclarationNameInfo MemberNameInfo, 1927 const TemplateArgumentListInfo *targs, 1928 QualType ty, ExprValueKind VK, ExprObjectKind OK); 1929 1930 void setBase(Expr *E) { Base = E; } 1931 Expr *getBase() const { return cast<Expr>(Base); } 1932 1933 /// \brief Retrieve the member declaration to which this expression refers. 1934 /// 1935 /// The returned declaration will either be a FieldDecl or (in C++) 1936 /// a CXXMethodDecl. 1937 ValueDecl *getMemberDecl() const { return MemberDecl; } 1938 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1939 1940 /// \brief Retrieves the declaration found by lookup. 1941 DeclAccessPair getFoundDecl() const { 1942 if (!HasQualifierOrFoundDecl) 1943 return DeclAccessPair::make(getMemberDecl(), 1944 getMemberDecl()->getAccess()); 1945 return getMemberQualifier()->FoundDecl; 1946 } 1947 1948 /// \brief Determines whether this member expression actually had 1949 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1950 /// x->Base::foo. 1951 bool hasQualifier() const { return getQualifier() != 0; } 1952 1953 /// \brief If the member name was qualified, retrieves the source range of 1954 /// the nested-name-specifier that precedes the member name. Otherwise, 1955 /// returns an empty source range. 1956 SourceRange getQualifierRange() const { 1957 if (!HasQualifierOrFoundDecl) 1958 return SourceRange(); 1959 1960 return getMemberQualifier()->Range; 1961 } 1962 1963 /// \brief If the member name was qualified, retrieves the 1964 /// nested-name-specifier that precedes the member name. Otherwise, returns 1965 /// NULL. 1966 NestedNameSpecifier *getQualifier() const { 1967 if (!HasQualifierOrFoundDecl) 1968 return 0; 1969 1970 return getMemberQualifier()->NNS; 1971 } 1972 1973 /// \brief Determines whether this member expression actually had a C++ 1974 /// template argument list explicitly specified, e.g., x.f<int>. 1975 bool hasExplicitTemplateArgs() const { 1976 return HasExplicitTemplateArgumentList; 1977 } 1978 1979 /// \brief Copies the template arguments (if present) into the given 1980 /// structure. 1981 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1982 if (hasExplicitTemplateArgs()) 1983 getExplicitTemplateArgs().copyInto(List); 1984 } 1985 1986 /// \brief Retrieve the explicit template argument list that 1987 /// follow the member template name. This must only be called on an 1988 /// expression with explicit template arguments. 1989 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 1990 assert(HasExplicitTemplateArgumentList); 1991 if (!HasQualifierOrFoundDecl) 1992 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1993 1994 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 1995 getMemberQualifier() + 1); 1996 } 1997 1998 /// \brief Retrieve the explicit template argument list that 1999 /// followed the member template name. This must only be called on 2000 /// an expression with explicit template arguments. 2001 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 2002 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 2003 } 2004 2005 /// \brief Retrieves the optional explicit template arguments. 2006 /// This points to the same data as getExplicitTemplateArgs(), but 2007 /// returns null if there are no explicit template arguments. 2008 const ExplicitTemplateArgumentList *getOptionalExplicitTemplateArgs() const { 2009 if (!hasExplicitTemplateArgs()) return 0; 2010 return &getExplicitTemplateArgs(); 2011 } 2012 2013 /// \brief Retrieve the location of the left angle bracket following the 2014 /// member name ('<'), if any. 2015 SourceLocation getLAngleLoc() const { 2016 if (!HasExplicitTemplateArgumentList) 2017 return SourceLocation(); 2018 2019 return getExplicitTemplateArgs().LAngleLoc; 2020 } 2021 2022 /// \brief Retrieve the template arguments provided as part of this 2023 /// template-id. 2024 const TemplateArgumentLoc *getTemplateArgs() const { 2025 if (!HasExplicitTemplateArgumentList) 2026 return 0; 2027 2028 return getExplicitTemplateArgs().getTemplateArgs(); 2029 } 2030 2031 /// \brief Retrieve the number of template arguments provided as part of this 2032 /// template-id. 2033 unsigned getNumTemplateArgs() const { 2034 if (!HasExplicitTemplateArgumentList) 2035 return 0; 2036 2037 return getExplicitTemplateArgs().NumTemplateArgs; 2038 } 2039 2040 /// \brief Retrieve the location of the right angle bracket following the 2041 /// template arguments ('>'). 2042 SourceLocation getRAngleLoc() const { 2043 if (!HasExplicitTemplateArgumentList) 2044 return SourceLocation(); 2045 2046 return getExplicitTemplateArgs().RAngleLoc; 2047 } 2048 2049 /// \brief Retrieve the member declaration name info. 2050 DeclarationNameInfo getMemberNameInfo() const { 2051 return DeclarationNameInfo(MemberDecl->getDeclName(), 2052 MemberLoc, MemberDNLoc); 2053 } 2054 2055 bool isArrow() const { return IsArrow; } 2056 void setArrow(bool A) { IsArrow = A; } 2057 2058 /// getMemberLoc - Return the location of the "member", in X->F, it is the 2059 /// location of 'F'. 2060 SourceLocation getMemberLoc() const { return MemberLoc; } 2061 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 2062 2063 SourceRange getSourceRange() const { 2064 // If we have an implicit base (like a C++ implicit this), 2065 // make sure not to return its location 2066 SourceLocation EndLoc = (HasExplicitTemplateArgumentList) 2067 ? getRAngleLoc() : getMemberNameInfo().getEndLoc(); 2068 2069 SourceLocation BaseLoc = getBase()->getLocStart(); 2070 if (BaseLoc.isInvalid()) 2071 return SourceRange(MemberLoc, EndLoc); 2072 return SourceRange(BaseLoc, EndLoc); 2073 } 2074 2075 SourceLocation getExprLoc() const { return MemberLoc; } 2076 2077 static bool classof(const Stmt *T) { 2078 return T->getStmtClass() == MemberExprClass; 2079 } 2080 static bool classof(const MemberExpr *) { return true; } 2081 2082 // Iterators 2083 child_range children() { return child_range(&Base, &Base+1); } 2084 2085 friend class ASTReader; 2086 friend class ASTStmtWriter; 2087}; 2088 2089/// CompoundLiteralExpr - [C99 6.5.2.5] 2090/// 2091class CompoundLiteralExpr : public Expr { 2092 /// LParenLoc - If non-null, this is the location of the left paren in a 2093 /// compound literal like "(int){4}". This can be null if this is a 2094 /// synthesized compound expression. 2095 SourceLocation LParenLoc; 2096 2097 /// The type as written. This can be an incomplete array type, in 2098 /// which case the actual expression type will be different. 2099 TypeSourceInfo *TInfo; 2100 Stmt *Init; 2101 bool FileScope; 2102public: 2103 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 2104 QualType T, ExprValueKind VK, Expr *init, bool fileScope) 2105 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary, 2106 tinfo->getType()->isDependentType(), 2107 init->isValueDependent(), 2108 init->containsUnexpandedParameterPack()), 2109 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 2110 2111 /// \brief Construct an empty compound literal. 2112 explicit CompoundLiteralExpr(EmptyShell Empty) 2113 : Expr(CompoundLiteralExprClass, Empty) { } 2114 2115 const Expr *getInitializer() const { return cast<Expr>(Init); } 2116 Expr *getInitializer() { return cast<Expr>(Init); } 2117 void setInitializer(Expr *E) { Init = E; } 2118 2119 bool isFileScope() const { return FileScope; } 2120 void setFileScope(bool FS) { FileScope = FS; } 2121 2122 SourceLocation getLParenLoc() const { return LParenLoc; } 2123 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2124 2125 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 2126 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 2127 2128 SourceRange getSourceRange() const { 2129 // FIXME: Init should never be null. 2130 if (!Init) 2131 return SourceRange(); 2132 if (LParenLoc.isInvalid()) 2133 return Init->getSourceRange(); 2134 return SourceRange(LParenLoc, Init->getLocEnd()); 2135 } 2136 2137 static bool classof(const Stmt *T) { 2138 return T->getStmtClass() == CompoundLiteralExprClass; 2139 } 2140 static bool classof(const CompoundLiteralExpr *) { return true; } 2141 2142 // Iterators 2143 child_range children() { return child_range(&Init, &Init+1); } 2144}; 2145 2146/// CastExpr - Base class for type casts, including both implicit 2147/// casts (ImplicitCastExpr) and explicit casts that have some 2148/// representation in the source code (ExplicitCastExpr's derived 2149/// classes). 2150class CastExpr : public Expr { 2151public: 2152 typedef clang::CastKind CastKind; 2153 2154private: 2155 Stmt *Op; 2156 2157 void CheckCastConsistency() const { 2158#ifndef NDEBUG 2159 switch (getCastKind()) { 2160 case CK_DerivedToBase: 2161 case CK_UncheckedDerivedToBase: 2162 case CK_DerivedToBaseMemberPointer: 2163 case CK_BaseToDerived: 2164 case CK_BaseToDerivedMemberPointer: 2165 assert(!path_empty() && "Cast kind should have a base path!"); 2166 break; 2167 2168 // These should not have an inheritance path. 2169 case CK_BitCast: 2170 case CK_Dynamic: 2171 case CK_ToUnion: 2172 case CK_ArrayToPointerDecay: 2173 case CK_FunctionToPointerDecay: 2174 case CK_NullToMemberPointer: 2175 case CK_NullToPointer: 2176 case CK_ConstructorConversion: 2177 case CK_IntegralToPointer: 2178 case CK_PointerToIntegral: 2179 case CK_ToVoid: 2180 case CK_VectorSplat: 2181 case CK_IntegralCast: 2182 case CK_IntegralToFloating: 2183 case CK_FloatingToIntegral: 2184 case CK_FloatingCast: 2185 case CK_AnyPointerToObjCPointerCast: 2186 case CK_AnyPointerToBlockPointerCast: 2187 case CK_ObjCObjectLValueCast: 2188 case CK_FloatingRealToComplex: 2189 case CK_FloatingComplexToReal: 2190 case CK_FloatingComplexCast: 2191 case CK_FloatingComplexToIntegralComplex: 2192 case CK_IntegralRealToComplex: 2193 case CK_IntegralComplexToReal: 2194 case CK_IntegralComplexCast: 2195 case CK_IntegralComplexToFloatingComplex: 2196 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 2197 // fallthrough to check for null base path 2198 2199 case CK_Dependent: 2200 case CK_LValueToRValue: 2201 case CK_GetObjCProperty: 2202 case CK_NoOp: 2203 case CK_PointerToBoolean: 2204 case CK_IntegralToBoolean: 2205 case CK_FloatingToBoolean: 2206 case CK_MemberPointerToBoolean: 2207 case CK_FloatingComplexToBoolean: 2208 case CK_IntegralComplexToBoolean: 2209 case CK_LValueBitCast: // -> bool& 2210 case CK_UserDefinedConversion: // operator bool() 2211 assert(path_empty() && "Cast kind should not have a base path!"); 2212 break; 2213 } 2214#endif 2215 } 2216 2217 const CXXBaseSpecifier * const *path_buffer() const { 2218 return const_cast<CastExpr*>(this)->path_buffer(); 2219 } 2220 CXXBaseSpecifier **path_buffer(); 2221 2222protected: 2223 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, 2224 const CastKind kind, Expr *op, unsigned BasePathSize) : 2225 Expr(SC, ty, VK, OK_Ordinary, 2226 // Cast expressions are type-dependent if the type is 2227 // dependent (C++ [temp.dep.expr]p3). 2228 ty->isDependentType(), 2229 // Cast expressions are value-dependent if the type is 2230 // dependent or if the subexpression is value-dependent. 2231 ty->isDependentType() || (op && op->isValueDependent()), 2232 (ty->containsUnexpandedParameterPack() || 2233 op->containsUnexpandedParameterPack())), 2234 Op(op) { 2235 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2236 CastExprBits.Kind = kind; 2237 CastExprBits.BasePathSize = BasePathSize; 2238 CheckCastConsistency(); 2239 } 2240 2241 /// \brief Construct an empty cast. 2242 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2243 : Expr(SC, Empty) { 2244 CastExprBits.BasePathSize = BasePathSize; 2245 } 2246 2247public: 2248 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2249 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2250 const char *getCastKindName() const; 2251 2252 Expr *getSubExpr() { return cast<Expr>(Op); } 2253 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2254 void setSubExpr(Expr *E) { Op = E; } 2255 2256 /// \brief Retrieve the cast subexpression as it was written in the source 2257 /// code, looking through any implicit casts or other intermediate nodes 2258 /// introduced by semantic analysis. 2259 Expr *getSubExprAsWritten(); 2260 const Expr *getSubExprAsWritten() const { 2261 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2262 } 2263 2264 typedef CXXBaseSpecifier **path_iterator; 2265 typedef const CXXBaseSpecifier * const *path_const_iterator; 2266 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2267 unsigned path_size() const { return CastExprBits.BasePathSize; } 2268 path_iterator path_begin() { return path_buffer(); } 2269 path_iterator path_end() { return path_buffer() + path_size(); } 2270 path_const_iterator path_begin() const { return path_buffer(); } 2271 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2272 2273 void setCastPath(const CXXCastPath &Path); 2274 2275 static bool classof(const Stmt *T) { 2276 return T->getStmtClass() >= firstCastExprConstant && 2277 T->getStmtClass() <= lastCastExprConstant; 2278 } 2279 static bool classof(const CastExpr *) { return true; } 2280 2281 // Iterators 2282 child_range children() { return child_range(&Op, &Op+1); } 2283}; 2284 2285/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2286/// conversions, which have no direct representation in the original 2287/// source code. For example: converting T[]->T*, void f()->void 2288/// (*f)(), float->double, short->int, etc. 2289/// 2290/// In C, implicit casts always produce rvalues. However, in C++, an 2291/// implicit cast whose result is being bound to a reference will be 2292/// an lvalue or xvalue. For example: 2293/// 2294/// @code 2295/// class Base { }; 2296/// class Derived : public Base { }; 2297/// Derived &&ref(); 2298/// void f(Derived d) { 2299/// Base& b = d; // initializer is an ImplicitCastExpr 2300/// // to an lvalue of type Base 2301/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2302/// // to an xvalue of type Base 2303/// } 2304/// @endcode 2305class ImplicitCastExpr : public CastExpr { 2306private: 2307 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2308 unsigned BasePathLength, ExprValueKind VK) 2309 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { 2310 } 2311 2312 /// \brief Construct an empty implicit cast. 2313 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2314 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2315 2316public: 2317 enum OnStack_t { OnStack }; 2318 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2319 ExprValueKind VK) 2320 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) { 2321 } 2322 2323 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2324 CastKind Kind, Expr *Operand, 2325 const CXXCastPath *BasePath, 2326 ExprValueKind Cat); 2327 2328 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2329 2330 SourceRange getSourceRange() const { 2331 return getSubExpr()->getSourceRange(); 2332 } 2333 2334 static bool classof(const Stmt *T) { 2335 return T->getStmtClass() == ImplicitCastExprClass; 2336 } 2337 static bool classof(const ImplicitCastExpr *) { return true; } 2338}; 2339 2340/// ExplicitCastExpr - An explicit cast written in the source 2341/// code. 2342/// 2343/// This class is effectively an abstract class, because it provides 2344/// the basic representation of an explicitly-written cast without 2345/// specifying which kind of cast (C cast, functional cast, static 2346/// cast, etc.) was written; specific derived classes represent the 2347/// particular style of cast and its location information. 2348/// 2349/// Unlike implicit casts, explicit cast nodes have two different 2350/// types: the type that was written into the source code, and the 2351/// actual type of the expression as determined by semantic 2352/// analysis. These types may differ slightly. For example, in C++ one 2353/// can cast to a reference type, which indicates that the resulting 2354/// expression will be an lvalue or xvalue. The reference type, however, 2355/// will not be used as the type of the expression. 2356class ExplicitCastExpr : public CastExpr { 2357 /// TInfo - Source type info for the (written) type 2358 /// this expression is casting to. 2359 TypeSourceInfo *TInfo; 2360 2361protected: 2362 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK, 2363 CastKind kind, Expr *op, unsigned PathSize, 2364 TypeSourceInfo *writtenTy) 2365 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {} 2366 2367 /// \brief Construct an empty explicit cast. 2368 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2369 : CastExpr(SC, Shell, PathSize) { } 2370 2371public: 2372 /// getTypeInfoAsWritten - Returns the type source info for the type 2373 /// that this expression is casting to. 2374 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2375 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2376 2377 /// getTypeAsWritten - Returns the type that this expression is 2378 /// casting to, as written in the source code. 2379 QualType getTypeAsWritten() const { return TInfo->getType(); } 2380 2381 static bool classof(const Stmt *T) { 2382 return T->getStmtClass() >= firstExplicitCastExprConstant && 2383 T->getStmtClass() <= lastExplicitCastExprConstant; 2384 } 2385 static bool classof(const ExplicitCastExpr *) { return true; } 2386}; 2387 2388/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2389/// cast in C++ (C++ [expr.cast]), which uses the syntax 2390/// (Type)expr. For example: @c (int)f. 2391class CStyleCastExpr : public ExplicitCastExpr { 2392 SourceLocation LPLoc; // the location of the left paren 2393 SourceLocation RPLoc; // the location of the right paren 2394 2395 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op, 2396 unsigned PathSize, TypeSourceInfo *writtenTy, 2397 SourceLocation l, SourceLocation r) 2398 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize, 2399 writtenTy), LPLoc(l), RPLoc(r) {} 2400 2401 /// \brief Construct an empty C-style explicit cast. 2402 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2403 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2404 2405public: 2406 static CStyleCastExpr *Create(ASTContext &Context, QualType T, 2407 ExprValueKind VK, CastKind K, 2408 Expr *Op, const CXXCastPath *BasePath, 2409 TypeSourceInfo *WrittenTy, SourceLocation L, 2410 SourceLocation R); 2411 2412 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2413 2414 SourceLocation getLParenLoc() const { return LPLoc; } 2415 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2416 2417 SourceLocation getRParenLoc() const { return RPLoc; } 2418 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2419 2420 SourceRange getSourceRange() const { 2421 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2422 } 2423 static bool classof(const Stmt *T) { 2424 return T->getStmtClass() == CStyleCastExprClass; 2425 } 2426 static bool classof(const CStyleCastExpr *) { return true; } 2427}; 2428 2429/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2430/// 2431/// This expression node kind describes a builtin binary operation, 2432/// such as "x + y" for integer values "x" and "y". The operands will 2433/// already have been converted to appropriate types (e.g., by 2434/// performing promotions or conversions). 2435/// 2436/// In C++, where operators may be overloaded, a different kind of 2437/// expression node (CXXOperatorCallExpr) is used to express the 2438/// invocation of an overloaded operator with operator syntax. Within 2439/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2440/// used to store an expression "x + y" depends on the subexpressions 2441/// for x and y. If neither x or y is type-dependent, and the "+" 2442/// operator resolves to a built-in operation, BinaryOperator will be 2443/// used to express the computation (x and y may still be 2444/// value-dependent). If either x or y is type-dependent, or if the 2445/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2446/// be used to express the computation. 2447class BinaryOperator : public Expr { 2448public: 2449 typedef BinaryOperatorKind Opcode; 2450 2451private: 2452 unsigned Opc : 6; 2453 SourceLocation OpLoc; 2454 2455 enum { LHS, RHS, END_EXPR }; 2456 Stmt* SubExprs[END_EXPR]; 2457public: 2458 2459 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2460 ExprValueKind VK, ExprObjectKind OK, 2461 SourceLocation opLoc) 2462 : Expr(BinaryOperatorClass, ResTy, VK, OK, 2463 lhs->isTypeDependent() || rhs->isTypeDependent(), 2464 lhs->isValueDependent() || rhs->isValueDependent(), 2465 (lhs->containsUnexpandedParameterPack() || 2466 rhs->containsUnexpandedParameterPack())), 2467 Opc(opc), OpLoc(opLoc) { 2468 SubExprs[LHS] = lhs; 2469 SubExprs[RHS] = rhs; 2470 assert(!isCompoundAssignmentOp() && 2471 "Use ArithAssignBinaryOperator for compound assignments"); 2472 } 2473 2474 /// \brief Construct an empty binary operator. 2475 explicit BinaryOperator(EmptyShell Empty) 2476 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2477 2478 SourceLocation getOperatorLoc() const { return OpLoc; } 2479 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2480 2481 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2482 void setOpcode(Opcode O) { Opc = O; } 2483 2484 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2485 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2486 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2487 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2488 2489 SourceRange getSourceRange() const { 2490 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2491 } 2492 2493 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2494 /// corresponds to, e.g. "<<=". 2495 static const char *getOpcodeStr(Opcode Op); 2496 2497 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2498 2499 /// \brief Retrieve the binary opcode that corresponds to the given 2500 /// overloaded operator. 2501 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2502 2503 /// \brief Retrieve the overloaded operator kind that corresponds to 2504 /// the given binary opcode. 2505 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2506 2507 /// predicates to categorize the respective opcodes. 2508 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2509 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2510 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2511 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2512 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2513 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2514 2515 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2516 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2517 2518 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2519 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2520 2521 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2522 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2523 2524 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2525 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2526 2527 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2528 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2529 2530 static bool isAssignmentOp(Opcode Opc) { 2531 return Opc >= BO_Assign && Opc <= BO_OrAssign; 2532 } 2533 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); } 2534 2535 static bool isCompoundAssignmentOp(Opcode Opc) { 2536 return Opc > BO_Assign && Opc <= BO_OrAssign; 2537 } 2538 bool isCompoundAssignmentOp() const { 2539 return isCompoundAssignmentOp(getOpcode()); 2540 } 2541 2542 static bool isShiftAssignOp(Opcode Opc) { 2543 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2544 } 2545 bool isShiftAssignOp() const { 2546 return isShiftAssignOp(getOpcode()); 2547 } 2548 2549 static bool classof(const Stmt *S) { 2550 return S->getStmtClass() >= firstBinaryOperatorConstant && 2551 S->getStmtClass() <= lastBinaryOperatorConstant; 2552 } 2553 static bool classof(const BinaryOperator *) { return true; } 2554 2555 // Iterators 2556 child_range children() { 2557 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2558 } 2559 2560protected: 2561 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2562 ExprValueKind VK, ExprObjectKind OK, 2563 SourceLocation opLoc, bool dead) 2564 : Expr(CompoundAssignOperatorClass, ResTy, VK, OK, 2565 lhs->isTypeDependent() || rhs->isTypeDependent(), 2566 lhs->isValueDependent() || rhs->isValueDependent(), 2567 (lhs->containsUnexpandedParameterPack() || 2568 rhs->containsUnexpandedParameterPack())), 2569 Opc(opc), OpLoc(opLoc) { 2570 SubExprs[LHS] = lhs; 2571 SubExprs[RHS] = rhs; 2572 } 2573 2574 BinaryOperator(StmtClass SC, EmptyShell Empty) 2575 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2576}; 2577 2578/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2579/// track of the type the operation is performed in. Due to the semantics of 2580/// these operators, the operands are promoted, the aritmetic performed, an 2581/// implicit conversion back to the result type done, then the assignment takes 2582/// place. This captures the intermediate type which the computation is done 2583/// in. 2584class CompoundAssignOperator : public BinaryOperator { 2585 QualType ComputationLHSType; 2586 QualType ComputationResultType; 2587public: 2588 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResType, 2589 ExprValueKind VK, ExprObjectKind OK, 2590 QualType CompLHSType, QualType CompResultType, 2591 SourceLocation OpLoc) 2592 : BinaryOperator(lhs, rhs, opc, ResType, VK, OK, OpLoc, true), 2593 ComputationLHSType(CompLHSType), 2594 ComputationResultType(CompResultType) { 2595 assert(isCompoundAssignmentOp() && 2596 "Only should be used for compound assignments"); 2597 } 2598 2599 /// \brief Build an empty compound assignment operator expression. 2600 explicit CompoundAssignOperator(EmptyShell Empty) 2601 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2602 2603 // The two computation types are the type the LHS is converted 2604 // to for the computation and the type of the result; the two are 2605 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2606 QualType getComputationLHSType() const { return ComputationLHSType; } 2607 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2608 2609 QualType getComputationResultType() const { return ComputationResultType; } 2610 void setComputationResultType(QualType T) { ComputationResultType = T; } 2611 2612 static bool classof(const CompoundAssignOperator *) { return true; } 2613 static bool classof(const Stmt *S) { 2614 return S->getStmtClass() == CompoundAssignOperatorClass; 2615 } 2616}; 2617 2618/// AbstractConditionalOperator - An abstract base class for 2619/// ConditionalOperator and BinaryConditionalOperator. 2620class AbstractConditionalOperator : public Expr { 2621 SourceLocation QuestionLoc, ColonLoc; 2622 friend class ASTStmtReader; 2623 2624protected: 2625 AbstractConditionalOperator(StmtClass SC, QualType T, 2626 ExprValueKind VK, ExprObjectKind OK, 2627 bool TD, bool VD, 2628 bool ContainsUnexpandedParameterPack, 2629 SourceLocation qloc, 2630 SourceLocation cloc) 2631 : Expr(SC, T, VK, OK, TD, VD, ContainsUnexpandedParameterPack), 2632 QuestionLoc(qloc), ColonLoc(cloc) {} 2633 2634 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty) 2635 : Expr(SC, Empty) { } 2636 2637public: 2638 // getCond - Return the expression representing the condition for 2639 // the ?: operator. 2640 Expr *getCond() const; 2641 2642 // getTrueExpr - Return the subexpression representing the value of 2643 // the expression if the condition evaluates to true. 2644 Expr *getTrueExpr() const; 2645 2646 // getFalseExpr - Return the subexpression representing the value of 2647 // the expression if the condition evaluates to false. This is 2648 // the same as getRHS. 2649 Expr *getFalseExpr() const; 2650 2651 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2652 SourceLocation getColonLoc() const { return ColonLoc; } 2653 2654 static bool classof(const Stmt *T) { 2655 return T->getStmtClass() == ConditionalOperatorClass || 2656 T->getStmtClass() == BinaryConditionalOperatorClass; 2657 } 2658 static bool classof(const AbstractConditionalOperator *) { return true; } 2659}; 2660 2661/// ConditionalOperator - The ?: ternary operator. The GNU "missing 2662/// middle" extension is a BinaryConditionalOperator. 2663class ConditionalOperator : public AbstractConditionalOperator { 2664 enum { COND, LHS, RHS, END_EXPR }; 2665 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2666 2667 friend class ASTStmtReader; 2668public: 2669 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2670 SourceLocation CLoc, Expr *rhs, 2671 QualType t, ExprValueKind VK, ExprObjectKind OK) 2672 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, 2673 // FIXME: the type of the conditional operator doesn't 2674 // depend on the type of the conditional, but the standard 2675 // seems to imply that it could. File a bug! 2676 (lhs->isTypeDependent() || rhs->isTypeDependent()), 2677 (cond->isValueDependent() || lhs->isValueDependent() || 2678 rhs->isValueDependent()), 2679 (cond->containsUnexpandedParameterPack() || 2680 lhs->containsUnexpandedParameterPack() || 2681 rhs->containsUnexpandedParameterPack()), 2682 QLoc, CLoc) { 2683 SubExprs[COND] = cond; 2684 SubExprs[LHS] = lhs; 2685 SubExprs[RHS] = rhs; 2686 } 2687 2688 /// \brief Build an empty conditional operator. 2689 explicit ConditionalOperator(EmptyShell Empty) 2690 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { } 2691 2692 // getCond - Return the expression representing the condition for 2693 // the ?: operator. 2694 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2695 2696 // getTrueExpr - Return the subexpression representing the value of 2697 // the expression if the condition evaluates to true. 2698 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); } 2699 2700 // getFalseExpr - Return the subexpression representing the value of 2701 // the expression if the condition evaluates to false. This is 2702 // the same as getRHS. 2703 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2704 2705 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2706 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2707 2708 SourceRange getSourceRange() const { 2709 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2710 } 2711 static bool classof(const Stmt *T) { 2712 return T->getStmtClass() == ConditionalOperatorClass; 2713 } 2714 static bool classof(const ConditionalOperator *) { return true; } 2715 2716 // Iterators 2717 child_range children() { 2718 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 2719 } 2720}; 2721 2722/// BinaryConditionalOperator - The GNU extension to the conditional 2723/// operator which allows the middle operand to be omitted. 2724/// 2725/// This is a different expression kind on the assumption that almost 2726/// every client ends up needing to know that these are different. 2727class BinaryConditionalOperator : public AbstractConditionalOperator { 2728 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS }; 2729 2730 /// - the common condition/left-hand-side expression, which will be 2731 /// evaluated as the opaque value 2732 /// - the condition, expressed in terms of the opaque value 2733 /// - the left-hand-side, expressed in terms of the opaque value 2734 /// - the right-hand-side 2735 Stmt *SubExprs[NUM_SUBEXPRS]; 2736 OpaqueValueExpr *OpaqueValue; 2737 2738 friend class ASTStmtReader; 2739public: 2740 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue, 2741 Expr *cond, Expr *lhs, Expr *rhs, 2742 SourceLocation qloc, SourceLocation cloc, 2743 QualType t, ExprValueKind VK, ExprObjectKind OK) 2744 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK, 2745 (common->isTypeDependent() || rhs->isTypeDependent()), 2746 (common->isValueDependent() || rhs->isValueDependent()), 2747 (common->containsUnexpandedParameterPack() || 2748 rhs->containsUnexpandedParameterPack()), 2749 qloc, cloc), 2750 OpaqueValue(opaqueValue) { 2751 SubExprs[COMMON] = common; 2752 SubExprs[COND] = cond; 2753 SubExprs[LHS] = lhs; 2754 SubExprs[RHS] = rhs; 2755 2756 OpaqueValue->setSourceExpr(common); 2757 } 2758 2759 /// \brief Build an empty conditional operator. 2760 explicit BinaryConditionalOperator(EmptyShell Empty) 2761 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { } 2762 2763 /// \brief getCommon - Return the common expression, written to the 2764 /// left of the condition. The opaque value will be bound to the 2765 /// result of this expression. 2766 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); } 2767 2768 /// \brief getOpaqueValue - Return the opaque value placeholder. 2769 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; } 2770 2771 /// \brief getCond - Return the condition expression; this is defined 2772 /// in terms of the opaque value. 2773 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2774 2775 /// \brief getTrueExpr - Return the subexpression which will be 2776 /// evaluated if the condition evaluates to true; this is defined 2777 /// in terms of the opaque value. 2778 Expr *getTrueExpr() const { 2779 return cast<Expr>(SubExprs[LHS]); 2780 } 2781 2782 /// \brief getFalseExpr - Return the subexpression which will be 2783 /// evaluated if the condnition evaluates to false; this is 2784 /// defined in terms of the opaque value. 2785 Expr *getFalseExpr() const { 2786 return cast<Expr>(SubExprs[RHS]); 2787 } 2788 2789 SourceRange getSourceRange() const { 2790 return SourceRange(getCommon()->getLocStart(), getFalseExpr()->getLocEnd()); 2791 } 2792 static bool classof(const Stmt *T) { 2793 return T->getStmtClass() == BinaryConditionalOperatorClass; 2794 } 2795 static bool classof(const BinaryConditionalOperator *) { return true; } 2796 2797 // Iterators 2798 child_range children() { 2799 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS); 2800 } 2801}; 2802 2803inline Expr *AbstractConditionalOperator::getCond() const { 2804 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2805 return co->getCond(); 2806 return cast<BinaryConditionalOperator>(this)->getCond(); 2807} 2808 2809inline Expr *AbstractConditionalOperator::getTrueExpr() const { 2810 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2811 return co->getTrueExpr(); 2812 return cast<BinaryConditionalOperator>(this)->getTrueExpr(); 2813} 2814 2815inline Expr *AbstractConditionalOperator::getFalseExpr() const { 2816 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this)) 2817 return co->getFalseExpr(); 2818 return cast<BinaryConditionalOperator>(this)->getFalseExpr(); 2819} 2820 2821/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2822class AddrLabelExpr : public Expr { 2823 SourceLocation AmpAmpLoc, LabelLoc; 2824 LabelDecl *Label; 2825public: 2826 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L, 2827 QualType t) 2828 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary, false, false, false), 2829 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2830 2831 /// \brief Build an empty address of a label expression. 2832 explicit AddrLabelExpr(EmptyShell Empty) 2833 : Expr(AddrLabelExprClass, Empty) { } 2834 2835 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2836 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2837 SourceLocation getLabelLoc() const { return LabelLoc; } 2838 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2839 2840 SourceRange getSourceRange() const { 2841 return SourceRange(AmpAmpLoc, LabelLoc); 2842 } 2843 2844 LabelDecl *getLabel() const { return Label; } 2845 void setLabel(LabelDecl *L) { Label = L; } 2846 2847 static bool classof(const Stmt *T) { 2848 return T->getStmtClass() == AddrLabelExprClass; 2849 } 2850 static bool classof(const AddrLabelExpr *) { return true; } 2851 2852 // Iterators 2853 child_range children() { return child_range(); } 2854}; 2855 2856/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2857/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2858/// takes the value of the last subexpression. 2859/// 2860/// A StmtExpr is always an r-value; values "returned" out of a 2861/// StmtExpr will be copied. 2862class StmtExpr : public Expr { 2863 Stmt *SubStmt; 2864 SourceLocation LParenLoc, RParenLoc; 2865public: 2866 // FIXME: Does type-dependence need to be computed differently? 2867 StmtExpr(CompoundStmt *substmt, QualType T, 2868 SourceLocation lp, SourceLocation rp) : 2869 Expr(StmtExprClass, T, VK_RValue, OK_Ordinary, 2870 T->isDependentType(), false, false), 2871 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2872 2873 /// \brief Build an empty statement expression. 2874 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2875 2876 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2877 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2878 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2879 2880 SourceRange getSourceRange() const { 2881 return SourceRange(LParenLoc, RParenLoc); 2882 } 2883 2884 SourceLocation getLParenLoc() const { return LParenLoc; } 2885 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2886 SourceLocation getRParenLoc() const { return RParenLoc; } 2887 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2888 2889 static bool classof(const Stmt *T) { 2890 return T->getStmtClass() == StmtExprClass; 2891 } 2892 static bool classof(const StmtExpr *) { return true; } 2893 2894 // Iterators 2895 child_range children() { return child_range(&SubStmt, &SubStmt+1); } 2896}; 2897 2898 2899/// ShuffleVectorExpr - clang-specific builtin-in function 2900/// __builtin_shufflevector. 2901/// This AST node represents a operator that does a constant 2902/// shuffle, similar to LLVM's shufflevector instruction. It takes 2903/// two vectors and a variable number of constant indices, 2904/// and returns the appropriately shuffled vector. 2905class ShuffleVectorExpr : public Expr { 2906 SourceLocation BuiltinLoc, RParenLoc; 2907 2908 // SubExprs - the list of values passed to the __builtin_shufflevector 2909 // function. The first two are vectors, and the rest are constant 2910 // indices. The number of values in this list is always 2911 // 2+the number of indices in the vector type. 2912 Stmt **SubExprs; 2913 unsigned NumExprs; 2914 2915public: 2916 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2917 QualType Type, SourceLocation BLoc, 2918 SourceLocation RP); 2919 2920 /// \brief Build an empty vector-shuffle expression. 2921 explicit ShuffleVectorExpr(EmptyShell Empty) 2922 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2923 2924 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2925 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2926 2927 SourceLocation getRParenLoc() const { return RParenLoc; } 2928 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2929 2930 SourceRange getSourceRange() const { 2931 return SourceRange(BuiltinLoc, RParenLoc); 2932 } 2933 static bool classof(const Stmt *T) { 2934 return T->getStmtClass() == ShuffleVectorExprClass; 2935 } 2936 static bool classof(const ShuffleVectorExpr *) { return true; } 2937 2938 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2939 /// constant expression, the actual arguments passed in, and the function 2940 /// pointers. 2941 unsigned getNumSubExprs() const { return NumExprs; } 2942 2943 /// \brief Retrieve the array of expressions. 2944 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); } 2945 2946 /// getExpr - Return the Expr at the specified index. 2947 Expr *getExpr(unsigned Index) { 2948 assert((Index < NumExprs) && "Arg access out of range!"); 2949 return cast<Expr>(SubExprs[Index]); 2950 } 2951 const Expr *getExpr(unsigned Index) const { 2952 assert((Index < NumExprs) && "Arg access out of range!"); 2953 return cast<Expr>(SubExprs[Index]); 2954 } 2955 2956 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2957 2958 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2959 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2960 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2961 } 2962 2963 // Iterators 2964 child_range children() { 2965 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs); 2966 } 2967}; 2968 2969/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2970/// This AST node is similar to the conditional operator (?:) in C, with 2971/// the following exceptions: 2972/// - the test expression must be a integer constant expression. 2973/// - the expression returned acts like the chosen subexpression in every 2974/// visible way: the type is the same as that of the chosen subexpression, 2975/// and all predicates (whether it's an l-value, whether it's an integer 2976/// constant expression, etc.) return the same result as for the chosen 2977/// sub-expression. 2978class ChooseExpr : public Expr { 2979 enum { COND, LHS, RHS, END_EXPR }; 2980 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2981 SourceLocation BuiltinLoc, RParenLoc; 2982public: 2983 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, 2984 QualType t, ExprValueKind VK, ExprObjectKind OK, 2985 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2986 : Expr(ChooseExprClass, t, VK, OK, TypeDependent, ValueDependent, 2987 (cond->containsUnexpandedParameterPack() || 2988 lhs->containsUnexpandedParameterPack() || 2989 rhs->containsUnexpandedParameterPack())), 2990 BuiltinLoc(BLoc), RParenLoc(RP) { 2991 SubExprs[COND] = cond; 2992 SubExprs[LHS] = lhs; 2993 SubExprs[RHS] = rhs; 2994 } 2995 2996 /// \brief Build an empty __builtin_choose_expr. 2997 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2998 2999 /// isConditionTrue - Return whether the condition is true (i.e. not 3000 /// equal to zero). 3001 bool isConditionTrue(const ASTContext &C) const; 3002 3003 /// getChosenSubExpr - Return the subexpression chosen according to the 3004 /// condition. 3005 Expr *getChosenSubExpr(const ASTContext &C) const { 3006 return isConditionTrue(C) ? getLHS() : getRHS(); 3007 } 3008 3009 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 3010 void setCond(Expr *E) { SubExprs[COND] = E; } 3011 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 3012 void setLHS(Expr *E) { SubExprs[LHS] = E; } 3013 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 3014 void setRHS(Expr *E) { SubExprs[RHS] = E; } 3015 3016 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3017 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3018 3019 SourceLocation getRParenLoc() const { return RParenLoc; } 3020 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3021 3022 SourceRange getSourceRange() const { 3023 return SourceRange(BuiltinLoc, RParenLoc); 3024 } 3025 static bool classof(const Stmt *T) { 3026 return T->getStmtClass() == ChooseExprClass; 3027 } 3028 static bool classof(const ChooseExpr *) { return true; } 3029 3030 // Iterators 3031 child_range children() { 3032 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR); 3033 } 3034}; 3035 3036/// GNUNullExpr - Implements the GNU __null extension, which is a name 3037/// for a null pointer constant that has integral type (e.g., int or 3038/// long) and is the same size and alignment as a pointer. The __null 3039/// extension is typically only used by system headers, which define 3040/// NULL as __null in C++ rather than using 0 (which is an integer 3041/// that may not match the size of a pointer). 3042class GNUNullExpr : public Expr { 3043 /// TokenLoc - The location of the __null keyword. 3044 SourceLocation TokenLoc; 3045 3046public: 3047 GNUNullExpr(QualType Ty, SourceLocation Loc) 3048 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary, false, false, false), 3049 TokenLoc(Loc) { } 3050 3051 /// \brief Build an empty GNU __null expression. 3052 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 3053 3054 /// getTokenLocation - The location of the __null token. 3055 SourceLocation getTokenLocation() const { return TokenLoc; } 3056 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 3057 3058 SourceRange getSourceRange() const { 3059 return SourceRange(TokenLoc); 3060 } 3061 static bool classof(const Stmt *T) { 3062 return T->getStmtClass() == GNUNullExprClass; 3063 } 3064 static bool classof(const GNUNullExpr *) { return true; } 3065 3066 // Iterators 3067 child_range children() { return child_range(); } 3068}; 3069 3070/// VAArgExpr, used for the builtin function __builtin_va_arg. 3071class VAArgExpr : public Expr { 3072 Stmt *Val; 3073 TypeSourceInfo *TInfo; 3074 SourceLocation BuiltinLoc, RParenLoc; 3075public: 3076 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 3077 SourceLocation RPLoc, QualType t) 3078 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary, 3079 t->isDependentType(), false, 3080 (TInfo->getType()->containsUnexpandedParameterPack() || 3081 e->containsUnexpandedParameterPack())), 3082 Val(e), TInfo(TInfo), 3083 BuiltinLoc(BLoc), 3084 RParenLoc(RPLoc) { } 3085 3086 /// \brief Create an empty __builtin_va_arg expression. 3087 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 3088 3089 const Expr *getSubExpr() const { return cast<Expr>(Val); } 3090 Expr *getSubExpr() { return cast<Expr>(Val); } 3091 void setSubExpr(Expr *E) { Val = E; } 3092 3093 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 3094 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 3095 3096 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 3097 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 3098 3099 SourceLocation getRParenLoc() const { return RParenLoc; } 3100 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 3101 3102 SourceRange getSourceRange() const { 3103 return SourceRange(BuiltinLoc, RParenLoc); 3104 } 3105 static bool classof(const Stmt *T) { 3106 return T->getStmtClass() == VAArgExprClass; 3107 } 3108 static bool classof(const VAArgExpr *) { return true; } 3109 3110 // Iterators 3111 child_range children() { return child_range(&Val, &Val+1); } 3112}; 3113 3114/// @brief Describes an C or C++ initializer list. 3115/// 3116/// InitListExpr describes an initializer list, which can be used to 3117/// initialize objects of different types, including 3118/// struct/class/union types, arrays, and vectors. For example: 3119/// 3120/// @code 3121/// struct foo x = { 1, { 2, 3 } }; 3122/// @endcode 3123/// 3124/// Prior to semantic analysis, an initializer list will represent the 3125/// initializer list as written by the user, but will have the 3126/// placeholder type "void". This initializer list is called the 3127/// syntactic form of the initializer, and may contain C99 designated 3128/// initializers (represented as DesignatedInitExprs), initializations 3129/// of subobject members without explicit braces, and so on. Clients 3130/// interested in the original syntax of the initializer list should 3131/// use the syntactic form of the initializer list. 3132/// 3133/// After semantic analysis, the initializer list will represent the 3134/// semantic form of the initializer, where the initializations of all 3135/// subobjects are made explicit with nested InitListExpr nodes and 3136/// C99 designators have been eliminated by placing the designated 3137/// initializations into the subobject they initialize. Additionally, 3138/// any "holes" in the initialization, where no initializer has been 3139/// specified for a particular subobject, will be replaced with 3140/// implicitly-generated ImplicitValueInitExpr expressions that 3141/// value-initialize the subobjects. Note, however, that the 3142/// initializer lists may still have fewer initializers than there are 3143/// elements to initialize within the object. 3144/// 3145/// Given the semantic form of the initializer list, one can retrieve 3146/// the original syntactic form of that initializer list (if it 3147/// exists) using getSyntacticForm(). Since many initializer lists 3148/// have the same syntactic and semantic forms, getSyntacticForm() may 3149/// return NULL, indicating that the current initializer list also 3150/// serves as its syntactic form. 3151class InitListExpr : public Expr { 3152 // FIXME: Eliminate this vector in favor of ASTContext allocation 3153 typedef ASTVector<Stmt *> InitExprsTy; 3154 InitExprsTy InitExprs; 3155 SourceLocation LBraceLoc, RBraceLoc; 3156 3157 /// Contains the initializer list that describes the syntactic form 3158 /// written in the source code. 3159 InitListExpr *SyntacticForm; 3160 3161 /// If this initializer list initializes a union, specifies which 3162 /// field within the union will be initialized. 3163 FieldDecl *UnionFieldInit; 3164 3165 /// Whether this initializer list originally had a GNU array-range 3166 /// designator in it. This is a temporary marker used by CodeGen. 3167 bool HadArrayRangeDesignator; 3168 3169public: 3170 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 3171 Expr **initexprs, unsigned numinits, 3172 SourceLocation rbraceloc); 3173 3174 /// \brief Build an empty initializer list. 3175 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 3176 : Expr(InitListExprClass, Empty), InitExprs(C) { } 3177 3178 unsigned getNumInits() const { return InitExprs.size(); } 3179 3180 /// \brief Retrieve the set of initializers. 3181 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); } 3182 3183 const Expr *getInit(unsigned Init) const { 3184 assert(Init < getNumInits() && "Initializer access out of range!"); 3185 return cast_or_null<Expr>(InitExprs[Init]); 3186 } 3187 3188 Expr *getInit(unsigned Init) { 3189 assert(Init < getNumInits() && "Initializer access out of range!"); 3190 return cast_or_null<Expr>(InitExprs[Init]); 3191 } 3192 3193 void setInit(unsigned Init, Expr *expr) { 3194 assert(Init < getNumInits() && "Initializer access out of range!"); 3195 InitExprs[Init] = expr; 3196 } 3197 3198 /// \brief Reserve space for some number of initializers. 3199 void reserveInits(ASTContext &C, unsigned NumInits); 3200 3201 /// @brief Specify the number of initializers 3202 /// 3203 /// If there are more than @p NumInits initializers, the remaining 3204 /// initializers will be destroyed. If there are fewer than @p 3205 /// NumInits initializers, NULL expressions will be added for the 3206 /// unknown initializers. 3207 void resizeInits(ASTContext &Context, unsigned NumInits); 3208 3209 /// @brief Updates the initializer at index @p Init with the new 3210 /// expression @p expr, and returns the old expression at that 3211 /// location. 3212 /// 3213 /// When @p Init is out of range for this initializer list, the 3214 /// initializer list will be extended with NULL expressions to 3215 /// accomodate the new entry. 3216 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 3217 3218 /// \brief If this initializes a union, specifies which field in the 3219 /// union to initialize. 3220 /// 3221 /// Typically, this field is the first named field within the 3222 /// union. However, a designated initializer can specify the 3223 /// initialization of a different field within the union. 3224 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 3225 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 3226 3227 // Explicit InitListExpr's originate from source code (and have valid source 3228 // locations). Implicit InitListExpr's are created by the semantic analyzer. 3229 bool isExplicit() { 3230 return LBraceLoc.isValid() && RBraceLoc.isValid(); 3231 } 3232 3233 SourceLocation getLBraceLoc() const { return LBraceLoc; } 3234 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 3235 SourceLocation getRBraceLoc() const { return RBraceLoc; } 3236 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 3237 3238 /// @brief Retrieve the initializer list that describes the 3239 /// syntactic form of the initializer. 3240 /// 3241 /// 3242 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 3243 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 3244 3245 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 3246 void sawArrayRangeDesignator(bool ARD = true) { 3247 HadArrayRangeDesignator = ARD; 3248 } 3249 3250 SourceRange getSourceRange() const; 3251 3252 static bool classof(const Stmt *T) { 3253 return T->getStmtClass() == InitListExprClass; 3254 } 3255 static bool classof(const InitListExpr *) { return true; } 3256 3257 // Iterators 3258 child_range children() { 3259 if (InitExprs.empty()) return child_range(); 3260 return child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size()); 3261 } 3262 3263 typedef InitExprsTy::iterator iterator; 3264 typedef InitExprsTy::const_iterator const_iterator; 3265 typedef InitExprsTy::reverse_iterator reverse_iterator; 3266 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 3267 3268 iterator begin() { return InitExprs.begin(); } 3269 const_iterator begin() const { return InitExprs.begin(); } 3270 iterator end() { return InitExprs.end(); } 3271 const_iterator end() const { return InitExprs.end(); } 3272 reverse_iterator rbegin() { return InitExprs.rbegin(); } 3273 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 3274 reverse_iterator rend() { return InitExprs.rend(); } 3275 const_reverse_iterator rend() const { return InitExprs.rend(); } 3276}; 3277 3278/// @brief Represents a C99 designated initializer expression. 3279/// 3280/// A designated initializer expression (C99 6.7.8) contains one or 3281/// more designators (which can be field designators, array 3282/// designators, or GNU array-range designators) followed by an 3283/// expression that initializes the field or element(s) that the 3284/// designators refer to. For example, given: 3285/// 3286/// @code 3287/// struct point { 3288/// double x; 3289/// double y; 3290/// }; 3291/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3292/// @endcode 3293/// 3294/// The InitListExpr contains three DesignatedInitExprs, the first of 3295/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3296/// designators, one array designator for @c [2] followed by one field 3297/// designator for @c .y. The initalization expression will be 1.0. 3298class DesignatedInitExpr : public Expr { 3299public: 3300 /// \brief Forward declaration of the Designator class. 3301 class Designator; 3302 3303private: 3304 /// The location of the '=' or ':' prior to the actual initializer 3305 /// expression. 3306 SourceLocation EqualOrColonLoc; 3307 3308 /// Whether this designated initializer used the GNU deprecated 3309 /// syntax rather than the C99 '=' syntax. 3310 bool GNUSyntax : 1; 3311 3312 /// The number of designators in this initializer expression. 3313 unsigned NumDesignators : 15; 3314 3315 /// \brief The designators in this designated initialization 3316 /// expression. 3317 Designator *Designators; 3318 3319 /// The number of subexpressions of this initializer expression, 3320 /// which contains both the initializer and any additional 3321 /// expressions used by array and array-range designators. 3322 unsigned NumSubExprs : 16; 3323 3324 3325 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3326 const Designator *Designators, 3327 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3328 Expr **IndexExprs, unsigned NumIndexExprs, 3329 Expr *Init); 3330 3331 explicit DesignatedInitExpr(unsigned NumSubExprs) 3332 : Expr(DesignatedInitExprClass, EmptyShell()), 3333 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3334 3335public: 3336 /// A field designator, e.g., ".x". 3337 struct FieldDesignator { 3338 /// Refers to the field that is being initialized. The low bit 3339 /// of this field determines whether this is actually a pointer 3340 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3341 /// initially constructed, a field designator will store an 3342 /// IdentifierInfo*. After semantic analysis has resolved that 3343 /// name, the field designator will instead store a FieldDecl*. 3344 uintptr_t NameOrField; 3345 3346 /// The location of the '.' in the designated initializer. 3347 unsigned DotLoc; 3348 3349 /// The location of the field name in the designated initializer. 3350 unsigned FieldLoc; 3351 }; 3352 3353 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3354 struct ArrayOrRangeDesignator { 3355 /// Location of the first index expression within the designated 3356 /// initializer expression's list of subexpressions. 3357 unsigned Index; 3358 /// The location of the '[' starting the array range designator. 3359 unsigned LBracketLoc; 3360 /// The location of the ellipsis separating the start and end 3361 /// indices. Only valid for GNU array-range designators. 3362 unsigned EllipsisLoc; 3363 /// The location of the ']' terminating the array range designator. 3364 unsigned RBracketLoc; 3365 }; 3366 3367 /// @brief Represents a single C99 designator. 3368 /// 3369 /// @todo This class is infuriatingly similar to clang::Designator, 3370 /// but minor differences (storing indices vs. storing pointers) 3371 /// keep us from reusing it. Try harder, later, to rectify these 3372 /// differences. 3373 class Designator { 3374 /// @brief The kind of designator this describes. 3375 enum { 3376 FieldDesignator, 3377 ArrayDesignator, 3378 ArrayRangeDesignator 3379 } Kind; 3380 3381 union { 3382 /// A field designator, e.g., ".x". 3383 struct FieldDesignator Field; 3384 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3385 struct ArrayOrRangeDesignator ArrayOrRange; 3386 }; 3387 friend class DesignatedInitExpr; 3388 3389 public: 3390 Designator() {} 3391 3392 /// @brief Initializes a field designator. 3393 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3394 SourceLocation FieldLoc) 3395 : Kind(FieldDesignator) { 3396 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3397 Field.DotLoc = DotLoc.getRawEncoding(); 3398 Field.FieldLoc = FieldLoc.getRawEncoding(); 3399 } 3400 3401 /// @brief Initializes an array designator. 3402 Designator(unsigned Index, SourceLocation LBracketLoc, 3403 SourceLocation RBracketLoc) 3404 : Kind(ArrayDesignator) { 3405 ArrayOrRange.Index = Index; 3406 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3407 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3408 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3409 } 3410 3411 /// @brief Initializes a GNU array-range designator. 3412 Designator(unsigned Index, SourceLocation LBracketLoc, 3413 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3414 : Kind(ArrayRangeDesignator) { 3415 ArrayOrRange.Index = Index; 3416 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3417 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3418 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3419 } 3420 3421 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3422 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3423 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3424 3425 IdentifierInfo * getFieldName(); 3426 3427 FieldDecl *getField() { 3428 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3429 if (Field.NameOrField & 0x01) 3430 return 0; 3431 else 3432 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3433 } 3434 3435 void setField(FieldDecl *FD) { 3436 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3437 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3438 } 3439 3440 SourceLocation getDotLoc() const { 3441 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3442 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3443 } 3444 3445 SourceLocation getFieldLoc() const { 3446 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3447 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3448 } 3449 3450 SourceLocation getLBracketLoc() const { 3451 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3452 "Only valid on an array or array-range designator"); 3453 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3454 } 3455 3456 SourceLocation getRBracketLoc() const { 3457 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3458 "Only valid on an array or array-range designator"); 3459 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3460 } 3461 3462 SourceLocation getEllipsisLoc() const { 3463 assert(Kind == ArrayRangeDesignator && 3464 "Only valid on an array-range designator"); 3465 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3466 } 3467 3468 unsigned getFirstExprIndex() const { 3469 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3470 "Only valid on an array or array-range designator"); 3471 return ArrayOrRange.Index; 3472 } 3473 3474 SourceLocation getStartLocation() const { 3475 if (Kind == FieldDesignator) 3476 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3477 else 3478 return getLBracketLoc(); 3479 } 3480 }; 3481 3482 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3483 unsigned NumDesignators, 3484 Expr **IndexExprs, unsigned NumIndexExprs, 3485 SourceLocation EqualOrColonLoc, 3486 bool GNUSyntax, Expr *Init); 3487 3488 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3489 3490 /// @brief Returns the number of designators in this initializer. 3491 unsigned size() const { return NumDesignators; } 3492 3493 // Iterator access to the designators. 3494 typedef Designator* designators_iterator; 3495 designators_iterator designators_begin() { return Designators; } 3496 designators_iterator designators_end() { 3497 return Designators + NumDesignators; 3498 } 3499 3500 typedef std::reverse_iterator<designators_iterator> 3501 reverse_designators_iterator; 3502 reverse_designators_iterator designators_rbegin() { 3503 return reverse_designators_iterator(designators_end()); 3504 } 3505 reverse_designators_iterator designators_rend() { 3506 return reverse_designators_iterator(designators_begin()); 3507 } 3508 3509 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3510 3511 void setDesignators(ASTContext &C, const Designator *Desigs, 3512 unsigned NumDesigs); 3513 3514 Expr *getArrayIndex(const Designator& D); 3515 Expr *getArrayRangeStart(const Designator& D); 3516 Expr *getArrayRangeEnd(const Designator& D); 3517 3518 /// @brief Retrieve the location of the '=' that precedes the 3519 /// initializer value itself, if present. 3520 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3521 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3522 3523 /// @brief Determines whether this designated initializer used the 3524 /// deprecated GNU syntax for designated initializers. 3525 bool usesGNUSyntax() const { return GNUSyntax; } 3526 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3527 3528 /// @brief Retrieve the initializer value. 3529 Expr *getInit() const { 3530 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3531 } 3532 3533 void setInit(Expr *init) { 3534 *child_begin() = init; 3535 } 3536 3537 /// \brief Retrieve the total number of subexpressions in this 3538 /// designated initializer expression, including the actual 3539 /// initialized value and any expressions that occur within array 3540 /// and array-range designators. 3541 unsigned getNumSubExprs() const { return NumSubExprs; } 3542 3543 Expr *getSubExpr(unsigned Idx) { 3544 assert(Idx < NumSubExprs && "Subscript out of range"); 3545 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3546 Ptr += sizeof(DesignatedInitExpr); 3547 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3548 } 3549 3550 void setSubExpr(unsigned Idx, Expr *E) { 3551 assert(Idx < NumSubExprs && "Subscript out of range"); 3552 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3553 Ptr += sizeof(DesignatedInitExpr); 3554 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3555 } 3556 3557 /// \brief Replaces the designator at index @p Idx with the series 3558 /// of designators in [First, Last). 3559 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3560 const Designator *Last); 3561 3562 SourceRange getSourceRange() const; 3563 3564 static bool classof(const Stmt *T) { 3565 return T->getStmtClass() == DesignatedInitExprClass; 3566 } 3567 static bool classof(const DesignatedInitExpr *) { return true; } 3568 3569 // Iterators 3570 child_range children() { 3571 Stmt **begin = reinterpret_cast<Stmt**>(this + 1); 3572 return child_range(begin, begin + NumSubExprs); 3573 } 3574}; 3575 3576/// \brief Represents an implicitly-generated value initialization of 3577/// an object of a given type. 3578/// 3579/// Implicit value initializations occur within semantic initializer 3580/// list expressions (InitListExpr) as placeholders for subobject 3581/// initializations not explicitly specified by the user. 3582/// 3583/// \see InitListExpr 3584class ImplicitValueInitExpr : public Expr { 3585public: 3586 explicit ImplicitValueInitExpr(QualType ty) 3587 : Expr(ImplicitValueInitExprClass, ty, VK_RValue, OK_Ordinary, 3588 false, false, false) { } 3589 3590 /// \brief Construct an empty implicit value initialization. 3591 explicit ImplicitValueInitExpr(EmptyShell Empty) 3592 : Expr(ImplicitValueInitExprClass, Empty) { } 3593 3594 static bool classof(const Stmt *T) { 3595 return T->getStmtClass() == ImplicitValueInitExprClass; 3596 } 3597 static bool classof(const ImplicitValueInitExpr *) { return true; } 3598 3599 SourceRange getSourceRange() const { 3600 return SourceRange(); 3601 } 3602 3603 // Iterators 3604 child_range children() { return child_range(); } 3605}; 3606 3607 3608class ParenListExpr : public Expr { 3609 Stmt **Exprs; 3610 unsigned NumExprs; 3611 SourceLocation LParenLoc, RParenLoc; 3612 3613public: 3614 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3615 unsigned numexprs, SourceLocation rparenloc); 3616 3617 /// \brief Build an empty paren list. 3618 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3619 3620 unsigned getNumExprs() const { return NumExprs; } 3621 3622 const Expr* getExpr(unsigned Init) const { 3623 assert(Init < getNumExprs() && "Initializer access out of range!"); 3624 return cast_or_null<Expr>(Exprs[Init]); 3625 } 3626 3627 Expr* getExpr(unsigned Init) { 3628 assert(Init < getNumExprs() && "Initializer access out of range!"); 3629 return cast_or_null<Expr>(Exprs[Init]); 3630 } 3631 3632 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3633 3634 SourceLocation getLParenLoc() const { return LParenLoc; } 3635 SourceLocation getRParenLoc() const { return RParenLoc; } 3636 3637 SourceRange getSourceRange() const { 3638 return SourceRange(LParenLoc, RParenLoc); 3639 } 3640 static bool classof(const Stmt *T) { 3641 return T->getStmtClass() == ParenListExprClass; 3642 } 3643 static bool classof(const ParenListExpr *) { return true; } 3644 3645 // Iterators 3646 child_range children() { 3647 return child_range(&Exprs[0], &Exprs[0]+NumExprs); 3648 } 3649 3650 friend class ASTStmtReader; 3651 friend class ASTStmtWriter; 3652}; 3653 3654 3655//===----------------------------------------------------------------------===// 3656// Clang Extensions 3657//===----------------------------------------------------------------------===// 3658 3659 3660/// ExtVectorElementExpr - This represents access to specific elements of a 3661/// vector, and may occur on the left hand side or right hand side. For example 3662/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3663/// 3664/// Note that the base may have either vector or pointer to vector type, just 3665/// like a struct field reference. 3666/// 3667class ExtVectorElementExpr : public Expr { 3668 Stmt *Base; 3669 IdentifierInfo *Accessor; 3670 SourceLocation AccessorLoc; 3671public: 3672 ExtVectorElementExpr(QualType ty, ExprValueKind VK, Expr *base, 3673 IdentifierInfo &accessor, SourceLocation loc) 3674 : Expr(ExtVectorElementExprClass, ty, VK, 3675 (VK == VK_RValue ? OK_Ordinary : OK_VectorComponent), 3676 base->isTypeDependent(), base->isValueDependent(), 3677 base->containsUnexpandedParameterPack()), 3678 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3679 3680 /// \brief Build an empty vector element expression. 3681 explicit ExtVectorElementExpr(EmptyShell Empty) 3682 : Expr(ExtVectorElementExprClass, Empty) { } 3683 3684 const Expr *getBase() const { return cast<Expr>(Base); } 3685 Expr *getBase() { return cast<Expr>(Base); } 3686 void setBase(Expr *E) { Base = E; } 3687 3688 IdentifierInfo &getAccessor() const { return *Accessor; } 3689 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3690 3691 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3692 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3693 3694 /// getNumElements - Get the number of components being selected. 3695 unsigned getNumElements() const; 3696 3697 /// containsDuplicateElements - Return true if any element access is 3698 /// repeated. 3699 bool containsDuplicateElements() const; 3700 3701 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3702 /// aggregate Constant of ConstantInt(s). 3703 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3704 3705 SourceRange getSourceRange() const { 3706 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3707 } 3708 3709 /// isArrow - Return true if the base expression is a pointer to vector, 3710 /// return false if the base expression is a vector. 3711 bool isArrow() const; 3712 3713 static bool classof(const Stmt *T) { 3714 return T->getStmtClass() == ExtVectorElementExprClass; 3715 } 3716 static bool classof(const ExtVectorElementExpr *) { return true; } 3717 3718 // Iterators 3719 child_range children() { return child_range(&Base, &Base+1); } 3720}; 3721 3722 3723/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3724/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3725class BlockExpr : public Expr { 3726protected: 3727 BlockDecl *TheBlock; 3728public: 3729 BlockExpr(BlockDecl *BD, QualType ty) 3730 : Expr(BlockExprClass, ty, VK_RValue, OK_Ordinary, 3731 ty->isDependentType(), false, false), 3732 TheBlock(BD) {} 3733 3734 /// \brief Build an empty block expression. 3735 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3736 3737 const BlockDecl *getBlockDecl() const { return TheBlock; } 3738 BlockDecl *getBlockDecl() { return TheBlock; } 3739 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3740 3741 // Convenience functions for probing the underlying BlockDecl. 3742 SourceLocation getCaretLocation() const; 3743 const Stmt *getBody() const; 3744 Stmt *getBody(); 3745 3746 SourceRange getSourceRange() const { 3747 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3748 } 3749 3750 /// getFunctionType - Return the underlying function type for this block. 3751 const FunctionType *getFunctionType() const; 3752 3753 static bool classof(const Stmt *T) { 3754 return T->getStmtClass() == BlockExprClass; 3755 } 3756 static bool classof(const BlockExpr *) { return true; } 3757 3758 // Iterators 3759 child_range children() { return child_range(); } 3760}; 3761 3762/// BlockDeclRefExpr - A reference to a local variable declared in an 3763/// enclosing scope. 3764class BlockDeclRefExpr : public Expr { 3765 VarDecl *D; 3766 SourceLocation Loc; 3767 bool IsByRef : 1; 3768 bool ConstQualAdded : 1; 3769public: 3770 BlockDeclRefExpr(VarDecl *d, QualType t, ExprValueKind VK, 3771 SourceLocation l, bool ByRef, bool constAdded = false); 3772 3773 // \brief Build an empty reference to a declared variable in a 3774 // block. 3775 explicit BlockDeclRefExpr(EmptyShell Empty) 3776 : Expr(BlockDeclRefExprClass, Empty) { } 3777 3778 VarDecl *getDecl() { return D; } 3779 const VarDecl *getDecl() const { return D; } 3780 void setDecl(VarDecl *VD) { D = VD; } 3781 3782 SourceLocation getLocation() const { return Loc; } 3783 void setLocation(SourceLocation L) { Loc = L; } 3784 3785 SourceRange getSourceRange() const { return SourceRange(Loc); } 3786 3787 bool isByRef() const { return IsByRef; } 3788 void setByRef(bool BR) { IsByRef = BR; } 3789 3790 bool isConstQualAdded() const { return ConstQualAdded; } 3791 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3792 3793 static bool classof(const Stmt *T) { 3794 return T->getStmtClass() == BlockDeclRefExprClass; 3795 } 3796 static bool classof(const BlockDeclRefExpr *) { return true; } 3797 3798 // Iterators 3799 child_range children() { return child_range(); } 3800}; 3801 3802} // end namespace clang 3803 3804#endif 3805