Expr.h revision 5082d34e4107a44ac7f07b62f7a6c917e0e6e71e
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 <vector> 29 30namespace clang { 31 class ASTContext; 32 class APValue; 33 class Decl; 34 class IdentifierInfo; 35 class ParmVarDecl; 36 class NamedDecl; 37 class ValueDecl; 38 class BlockDecl; 39 class CXXBaseSpecifier; 40 class CXXOperatorCallExpr; 41 class CXXMemberCallExpr; 42 class TemplateArgumentLoc; 43 class TemplateArgumentListInfo; 44 45/// \brief A simple array of base specifiers. 46typedef llvm::SmallVector<CXXBaseSpecifier*, 4> CXXCastPath; 47 48/// Expr - This represents one expression. Note that Expr's are subclasses of 49/// Stmt. This allows an expression to be transparently used any place a Stmt 50/// is required. 51/// 52class Expr : public Stmt { 53 QualType TR; 54 55 virtual void ANCHOR(); // key function. 56 57protected: 58 Expr(StmtClass SC, QualType T, bool TD, bool VD) : Stmt(SC) { 59 ExprBits.TypeDependent = TD; 60 ExprBits.ValueDependent = VD; 61 ExprBits.ValueKind = 0; 62 setType(T); 63 } 64 65 /// \brief Construct an empty expression. 66 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 67 68 /// getValueKind - The value kind that this cast produces. 69 ExprValueKind getValueKind() const { 70 return static_cast<ExprValueKind>(ExprBits.ValueKind); 71 } 72 73 /// setValueKind - Set the value kind this cast produces. 74 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; } 75 76public: 77 QualType getType() const { return TR; } 78 void setType(QualType t) { 79 // In C++, the type of an expression is always adjusted so that it 80 // will not have reference type an expression will never have 81 // reference type (C++ [expr]p6). Use 82 // QualType::getNonReferenceType() to retrieve the non-reference 83 // type. Additionally, inspect Expr::isLvalue to determine whether 84 // an expression that is adjusted in this manner should be 85 // considered an lvalue. 86 assert((t.isNull() || !t->isReferenceType()) && 87 "Expressions can't have reference type"); 88 89 TR = t; 90 } 91 92 /// isValueDependent - Determines whether this expression is 93 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 94 /// array bound of "Chars" in the following example is 95 /// value-dependent. 96 /// @code 97 /// template<int Size, char (&Chars)[Size]> struct meta_string; 98 /// @endcode 99 bool isValueDependent() const { return ExprBits.ValueDependent; } 100 101 /// \brief Set whether this expression is value-dependent or not. 102 void setValueDependent(bool VD) { ExprBits.ValueDependent = VD; } 103 104 /// isTypeDependent - Determines whether this expression is 105 /// type-dependent (C++ [temp.dep.expr]), which means that its type 106 /// could change from one template instantiation to the next. For 107 /// example, the expressions "x" and "x + y" are type-dependent in 108 /// the following code, but "y" is not type-dependent: 109 /// @code 110 /// template<typename T> 111 /// void add(T x, int y) { 112 /// x + y; 113 /// } 114 /// @endcode 115 bool isTypeDependent() const { return ExprBits.TypeDependent; } 116 117 /// \brief Set whether this expression is type-dependent or not. 118 void setTypeDependent(bool TD) { ExprBits.TypeDependent = TD; } 119 120 /// SourceLocation tokens are not useful in isolation - they are low level 121 /// value objects created/interpreted by SourceManager. We assume AST 122 /// clients will have a pointer to the respective SourceManager. 123 virtual SourceRange getSourceRange() const = 0; 124 125 /// getExprLoc - Return the preferred location for the arrow when diagnosing 126 /// a problem with a generic expression. 127 virtual SourceLocation getExprLoc() const { return getLocStart(); } 128 129 /// isUnusedResultAWarning - Return true if this immediate expression should 130 /// be warned about if the result is unused. If so, fill in Loc and Ranges 131 /// with location to warn on and the source range[s] to report with the 132 /// warning. 133 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 134 SourceRange &R2, ASTContext &Ctx) const; 135 136 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 137 /// incomplete type other than void. Nonarray expressions that can be lvalues: 138 /// - name, where name must be a variable 139 /// - e[i] 140 /// - (e), where e must be an lvalue 141 /// - e.name, where e must be an lvalue 142 /// - e->name 143 /// - *e, the type of e cannot be a function type 144 /// - string-constant 145 /// - reference type [C++ [expr]] 146 /// - b ? x : y, where x and y are lvalues of suitable types [C++] 147 /// 148 enum isLvalueResult { 149 LV_Valid, 150 LV_NotObjectType, 151 LV_IncompleteVoidType, 152 LV_DuplicateVectorComponents, 153 LV_InvalidExpression, 154 LV_MemberFunction, 155 LV_SubObjCPropertySetting, 156 LV_ClassTemporary 157 }; 158 isLvalueResult isLvalue(ASTContext &Ctx) const; 159 160 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 161 /// does not have an incomplete type, does not have a const-qualified type, 162 /// and if it is a structure or union, does not have any member (including, 163 /// recursively, any member or element of all contained aggregates or unions) 164 /// with a const-qualified type. 165 /// 166 /// \param Loc [in] [out] - A source location which *may* be filled 167 /// in with the location of the expression making this a 168 /// non-modifiable lvalue, if specified. 169 enum isModifiableLvalueResult { 170 MLV_Valid, 171 MLV_NotObjectType, 172 MLV_IncompleteVoidType, 173 MLV_DuplicateVectorComponents, 174 MLV_InvalidExpression, 175 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 176 MLV_IncompleteType, 177 MLV_ConstQualified, 178 MLV_ArrayType, 179 MLV_NotBlockQualified, 180 MLV_ReadonlyProperty, 181 MLV_NoSetterProperty, 182 MLV_MemberFunction, 183 MLV_SubObjCPropertySetting, 184 MLV_ClassTemporary 185 }; 186 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 187 SourceLocation *Loc = 0) const; 188 189 /// \brief The return type of classify(). Represents the C++0x expression 190 /// taxonomy. 191 class Classification { 192 public: 193 /// \brief The various classification results. Most of these mean prvalue. 194 enum Kinds { 195 CL_LValue, 196 CL_XValue, 197 CL_Function, // Functions cannot be lvalues in C. 198 CL_Void, // Void cannot be an lvalue in C. 199 CL_DuplicateVectorComponents, // A vector shuffle with dupes. 200 CL_MemberFunction, // An expression referring to a member function 201 CL_SubObjCPropertySetting, 202 CL_ClassTemporary, // A prvalue of class type 203 CL_PRValue // A prvalue for any other reason, of any other type 204 }; 205 /// \brief The results of modification testing. 206 enum ModifiableType { 207 CM_Untested, // testModifiable was false. 208 CM_Modifiable, 209 CM_RValue, // Not modifiable because it's an rvalue 210 CM_Function, // Not modifiable because it's a function; C++ only 211 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext 212 CM_NotBlockQualified, // Not captured in the closure 213 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter 214 CM_ConstQualified, 215 CM_ArrayType, 216 CM_IncompleteType 217 }; 218 219 private: 220 friend class Expr; 221 222 unsigned short Kind; 223 unsigned short Modifiable; 224 225 explicit Classification(Kinds k, ModifiableType m) 226 : Kind(k), Modifiable(m) 227 {} 228 229 public: 230 Classification() {} 231 232 Kinds getKind() const { return static_cast<Kinds>(Kind); } 233 ModifiableType getModifiable() const { 234 assert(Modifiable != CM_Untested && "Did not test for modifiability."); 235 return static_cast<ModifiableType>(Modifiable); 236 } 237 bool isLValue() const { return Kind == CL_LValue; } 238 bool isXValue() const { return Kind == CL_XValue; } 239 bool isGLValue() const { return Kind <= CL_XValue; } 240 bool isPRValue() const { return Kind >= CL_Function; } 241 bool isRValue() const { return Kind >= CL_XValue; } 242 bool isModifiable() const { return getModifiable() == CM_Modifiable; } 243 }; 244 /// \brief Classify - Classify this expression according to the C++0x 245 /// expression taxonomy. 246 /// 247 /// C++0x defines ([basic.lval]) a new taxonomy of expressions to replace the 248 /// old lvalue vs rvalue. This function determines the type of expression this 249 /// is. There are three expression types: 250 /// - lvalues are classical lvalues as in C++03. 251 /// - prvalues are equivalent to rvalues in C++03. 252 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a 253 /// function returning an rvalue reference. 254 /// lvalues and xvalues are collectively referred to as glvalues, while 255 /// prvalues and xvalues together form rvalues. 256 Classification Classify(ASTContext &Ctx) const { 257 return ClassifyImpl(Ctx, 0); 258 } 259 260 /// \brief ClassifyModifiable - Classify this expression according to the 261 /// C++0x expression taxonomy, and see if it is valid on the left side 262 /// of an assignment. 263 /// 264 /// This function extends classify in that it also tests whether the 265 /// expression is modifiable (C99 6.3.2.1p1). 266 /// \param Loc A source location that might be filled with a relevant location 267 /// if the expression is not modifiable. 268 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{ 269 return ClassifyImpl(Ctx, &Loc); 270 } 271 272private: 273 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const; 274 275public: 276 277 /// \brief If this expression refers to a bit-field, retrieve the 278 /// declaration of that bit-field. 279 FieldDecl *getBitField(); 280 281 const FieldDecl *getBitField() const { 282 return const_cast<Expr*>(this)->getBitField(); 283 } 284 285 /// \brief Returns whether this expression refers to a vector element. 286 bool refersToVectorElement() const; 287 288 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 289 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 290 /// but also int expressions which are produced by things like comparisons in 291 /// C. 292 bool isKnownToHaveBooleanValue() const; 293 294 /// isIntegerConstantExpr - Return true if this expression is a valid integer 295 /// constant expression, and, if so, return its value in Result. If not a 296 /// valid i-c-e, return false and fill in Loc (if specified) with the location 297 /// of the invalid expression. 298 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 299 SourceLocation *Loc = 0, 300 bool isEvaluated = true) const; 301 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 302 llvm::APSInt X; 303 return isIntegerConstantExpr(X, Ctx, Loc); 304 } 305 /// isConstantInitializer - Returns true if this expression is a constant 306 /// initializer, which can be emitted at compile-time. 307 bool isConstantInitializer(ASTContext &Ctx, bool ForRef) const; 308 309 /// EvalResult is a struct with detailed info about an evaluated expression. 310 struct EvalResult { 311 /// Val - This is the value the expression can be folded to. 312 APValue Val; 313 314 /// HasSideEffects - Whether the evaluated expression has side effects. 315 /// For example, (f() && 0) can be folded, but it still has side effects. 316 bool HasSideEffects; 317 318 /// Diag - If the expression is unfoldable, then Diag contains a note 319 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 320 /// position for the error, and DiagExpr is the expression that caused 321 /// the error. 322 /// If the expression is foldable, but not an integer constant expression, 323 /// Diag contains a note diagnostic that describes why it isn't an integer 324 /// constant expression. If the expression *is* an integer constant 325 /// expression, then Diag will be zero. 326 unsigned Diag; 327 const Expr *DiagExpr; 328 SourceLocation DiagLoc; 329 330 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 331 332 // isGlobalLValue - Return true if the evaluated lvalue expression 333 // is global. 334 bool isGlobalLValue() const; 335 // hasSideEffects - Return true if the evaluated expression has 336 // side effects. 337 bool hasSideEffects() const { 338 return HasSideEffects; 339 } 340 }; 341 342 /// Evaluate - Return true if this is a constant which we can fold using 343 /// any crazy technique (that has nothing to do with language standards) that 344 /// we want to. If this function returns true, it returns the folded constant 345 /// in Result. 346 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 347 348 /// EvaluateAsBooleanCondition - Return true if this is a constant 349 /// which we we can fold and convert to a boolean condition using 350 /// any crazy technique that we want to. 351 bool EvaluateAsBooleanCondition(bool &Result, ASTContext &Ctx) const; 352 353 /// isEvaluatable - Call Evaluate to see if this expression can be constant 354 /// folded, but discard the result. 355 bool isEvaluatable(ASTContext &Ctx) const; 356 357 /// HasSideEffects - This routine returns true for all those expressions 358 /// which must be evaluated each time and must not be optimized away 359 /// or evaluated at compile time. Example is a function call, volatile 360 /// variable read. 361 bool HasSideEffects(ASTContext &Ctx) const; 362 363 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 364 /// must be called on an expression that constant folds to an integer. 365 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 366 367 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 368 /// with link time known address. 369 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 370 371 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue. 372 bool EvaluateAsAnyLValue(EvalResult &Result, ASTContext &Ctx) const; 373 374 /// \brief Enumeration used to describe how \c isNullPointerConstant() 375 /// should cope with value-dependent expressions. 376 enum NullPointerConstantValueDependence { 377 /// \brief Specifies that the expression should never be value-dependent. 378 NPC_NeverValueDependent = 0, 379 380 /// \brief Specifies that a value-dependent expression of integral or 381 /// dependent type should be considered a null pointer constant. 382 NPC_ValueDependentIsNull, 383 384 /// \brief Specifies that a value-dependent expression should be considered 385 /// to never be a null pointer constant. 386 NPC_ValueDependentIsNotNull 387 }; 388 389 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 390 /// integer constant expression with the value zero, or if this is one that is 391 /// cast to void*. 392 bool isNullPointerConstant(ASTContext &Ctx, 393 NullPointerConstantValueDependence NPC) const; 394 395 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 396 /// write barrier. 397 bool isOBJCGCCandidate(ASTContext &Ctx) const; 398 399 /// \brief Returns true if this expression is a bound member function. 400 bool isBoundMemberFunction(ASTContext &Ctx) const; 401 402 /// \brief Result type of CanThrow(). 403 enum CanThrowResult { 404 CT_Cannot, 405 CT_Dependent, 406 CT_Can 407 }; 408 /// \brief Test if this expression, if evaluated, might throw, according to 409 /// the rules of C++ [expr.unary.noexcept]. 410 CanThrowResult CanThrow(ASTContext &C) const; 411 412 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 413 /// its subexpression. If that subexpression is also a ParenExpr, 414 /// then this method recursively returns its subexpression, and so forth. 415 /// Otherwise, the method returns the current Expr. 416 Expr *IgnoreParens(); 417 418 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 419 /// or CastExprs, returning their operand. 420 Expr *IgnoreParenCasts(); 421 422 /// IgnoreParenImpCasts - Ignore parentheses and implicit casts. Strip off any 423 /// ParenExpr or ImplicitCastExprs, returning their operand. 424 Expr *IgnoreParenImpCasts(); 425 426 const Expr *IgnoreParenImpCasts() const { 427 return const_cast<Expr*>(this)->IgnoreParenImpCasts(); 428 } 429 430 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 431 /// value (including ptr->int casts of the same size). Strip off any 432 /// ParenExpr or CastExprs, returning their operand. 433 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 434 435 /// \brief Determine whether this expression is a default function argument. 436 /// 437 /// Default arguments are implicitly generated in the abstract syntax tree 438 /// by semantic analysis for function calls, object constructions, etc. in 439 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 440 /// this routine also looks through any implicit casts to determine whether 441 /// the expression is a default argument. 442 bool isDefaultArgument() const; 443 444 /// \brief Determine whether the result of this expression is a 445 /// temporary object of the given class type. 446 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const; 447 448 const Expr *IgnoreParens() const { 449 return const_cast<Expr*>(this)->IgnoreParens(); 450 } 451 const Expr *IgnoreParenCasts() const { 452 return const_cast<Expr*>(this)->IgnoreParenCasts(); 453 } 454 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 455 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 456 } 457 458 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 459 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 460 461 static bool classof(const Stmt *T) { 462 return T->getStmtClass() >= firstExprConstant && 463 T->getStmtClass() <= lastExprConstant; 464 } 465 static bool classof(const Expr *) { return true; } 466}; 467 468 469//===----------------------------------------------------------------------===// 470// Primary Expressions. 471//===----------------------------------------------------------------------===// 472 473/// \brief Represents the qualifier that may precede a C++ name, e.g., the 474/// "std::" in "std::sort". 475struct NameQualifier { 476 /// \brief The nested name specifier. 477 NestedNameSpecifier *NNS; 478 479 /// \brief The source range covered by the nested name specifier. 480 SourceRange Range; 481}; 482 483/// \brief Represents an explicit template argument list in C++, e.g., 484/// the "<int>" in "sort<int>". 485struct ExplicitTemplateArgumentList { 486 /// \brief The source location of the left angle bracket ('<'); 487 SourceLocation LAngleLoc; 488 489 /// \brief The source location of the right angle bracket ('>'); 490 SourceLocation RAngleLoc; 491 492 /// \brief The number of template arguments in TemplateArgs. 493 /// The actual template arguments (if any) are stored after the 494 /// ExplicitTemplateArgumentList structure. 495 unsigned NumTemplateArgs; 496 497 /// \brief Retrieve the template arguments 498 TemplateArgumentLoc *getTemplateArgs() { 499 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 500 } 501 502 /// \brief Retrieve the template arguments 503 const TemplateArgumentLoc *getTemplateArgs() const { 504 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 505 } 506 507 void initializeFrom(const TemplateArgumentListInfo &List); 508 void copyInto(TemplateArgumentListInfo &List) const; 509 static std::size_t sizeFor(unsigned NumTemplateArgs); 510 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 511}; 512 513/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 514/// enum, etc. 515class DeclRefExpr : public Expr { 516 enum { 517 // Flag on DecoratedD that specifies when this declaration reference 518 // expression has a C++ nested-name-specifier. 519 HasQualifierFlag = 0x01, 520 // Flag on DecoratedD that specifies when this declaration reference 521 // expression has an explicit C++ template argument list. 522 HasExplicitTemplateArgumentListFlag = 0x02 523 }; 524 525 // DecoratedD - The declaration that we are referencing, plus two bits to 526 // indicate whether (1) the declaration's name was explicitly qualified and 527 // (2) the declaration's name was followed by an explicit template 528 // argument list. 529 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 530 531 // Loc - The location of the declaration name itself. 532 SourceLocation Loc; 533 534 /// DNLoc - Provides source/type location info for the 535 /// declaration name embedded in DecoratedD. 536 DeclarationNameLoc DNLoc; 537 538 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 539 NameQualifier *getNameQualifier() { 540 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 541 return 0; 542 543 return reinterpret_cast<NameQualifier *> (this + 1); 544 } 545 546 /// \brief Retrieve the qualifier that preceded the member name, if any. 547 const NameQualifier *getNameQualifier() const { 548 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 549 } 550 551 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 552 ValueDecl *D, SourceLocation NameLoc, 553 const TemplateArgumentListInfo *TemplateArgs, 554 QualType T); 555 556 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 557 ValueDecl *D, const DeclarationNameInfo &NameInfo, 558 const TemplateArgumentListInfo *TemplateArgs, 559 QualType T); 560 561 /// \brief Construct an empty declaration reference expression. 562 explicit DeclRefExpr(EmptyShell Empty) 563 : Expr(DeclRefExprClass, Empty) { } 564 565 /// \brief Computes the type- and value-dependence flags for this 566 /// declaration reference expression. 567 void computeDependence(); 568 569public: 570 DeclRefExpr(ValueDecl *d, QualType t, SourceLocation l) : 571 Expr(DeclRefExprClass, t, false, false), DecoratedD(d, 0), Loc(l) { 572 computeDependence(); 573 } 574 575 static DeclRefExpr *Create(ASTContext &Context, 576 NestedNameSpecifier *Qualifier, 577 SourceRange QualifierRange, 578 ValueDecl *D, 579 SourceLocation NameLoc, 580 QualType T, 581 const TemplateArgumentListInfo *TemplateArgs = 0); 582 583 static DeclRefExpr *Create(ASTContext &Context, 584 NestedNameSpecifier *Qualifier, 585 SourceRange QualifierRange, 586 ValueDecl *D, 587 const DeclarationNameInfo &NameInfo, 588 QualType T, 589 const TemplateArgumentListInfo *TemplateArgs = 0); 590 591 /// \brief Construct an empty declaration reference expression. 592 static DeclRefExpr *CreateEmpty(ASTContext &Context, 593 bool HasQualifier, unsigned NumTemplateArgs); 594 595 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 596 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 597 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 598 599 DeclarationNameInfo getNameInfo() const { 600 return DeclarationNameInfo(getDecl()->getDeclName(), Loc, DNLoc); 601 } 602 603 SourceLocation getLocation() const { return Loc; } 604 void setLocation(SourceLocation L) { Loc = L; } 605 virtual SourceRange getSourceRange() const; 606 607 /// \brief Determine whether this declaration reference was preceded by a 608 /// C++ nested-name-specifier, e.g., \c N::foo. 609 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 610 611 /// \brief If the name was qualified, retrieves the source range of 612 /// the nested-name-specifier that precedes the name. Otherwise, 613 /// returns an empty source range. 614 SourceRange getQualifierRange() const { 615 if (!hasQualifier()) 616 return SourceRange(); 617 618 return getNameQualifier()->Range; 619 } 620 621 /// \brief If the name was qualified, retrieves the nested-name-specifier 622 /// that precedes the name. Otherwise, returns NULL. 623 NestedNameSpecifier *getQualifier() const { 624 if (!hasQualifier()) 625 return 0; 626 627 return getNameQualifier()->NNS; 628 } 629 630 bool hasExplicitTemplateArgs() const { 631 return (DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag); 632 } 633 634 /// \brief Retrieve the explicit template argument list that followed the 635 /// member template name. 636 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 637 assert(hasExplicitTemplateArgs()); 638 639 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 640 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 641 642 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 643 getNameQualifier() + 1); 644 } 645 646 /// \brief Retrieve the explicit template argument list that followed the 647 /// member template name. 648 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 649 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgs(); 650 } 651 652 /// \brief Retrieves the optional explicit template arguments. 653 /// This points to the same data as getExplicitTemplateArgs(), but 654 /// returns null if there are no explicit template arguments. 655 const ExplicitTemplateArgumentList *getExplicitTemplateArgsOpt() const { 656 if (!hasExplicitTemplateArgs()) return 0; 657 return &getExplicitTemplateArgs(); 658 } 659 660 /// \brief Copies the template arguments (if present) into the given 661 /// structure. 662 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 663 if (hasExplicitTemplateArgs()) 664 getExplicitTemplateArgs().copyInto(List); 665 } 666 667 /// \brief Retrieve the location of the left angle bracket following the 668 /// member name ('<'), if any. 669 SourceLocation getLAngleLoc() const { 670 if (!hasExplicitTemplateArgs()) 671 return SourceLocation(); 672 673 return getExplicitTemplateArgs().LAngleLoc; 674 } 675 676 /// \brief Retrieve the template arguments provided as part of this 677 /// template-id. 678 const TemplateArgumentLoc *getTemplateArgs() const { 679 if (!hasExplicitTemplateArgs()) 680 return 0; 681 682 return getExplicitTemplateArgs().getTemplateArgs(); 683 } 684 685 /// \brief Retrieve the number of template arguments provided as part of this 686 /// template-id. 687 unsigned getNumTemplateArgs() const { 688 if (!hasExplicitTemplateArgs()) 689 return 0; 690 691 return getExplicitTemplateArgs().NumTemplateArgs; 692 } 693 694 /// \brief Retrieve the location of the right angle bracket following the 695 /// template arguments ('>'). 696 SourceLocation getRAngleLoc() const { 697 if (!hasExplicitTemplateArgs()) 698 return SourceLocation(); 699 700 return getExplicitTemplateArgs().RAngleLoc; 701 } 702 703 static bool classof(const Stmt *T) { 704 return T->getStmtClass() == DeclRefExprClass; 705 } 706 static bool classof(const DeclRefExpr *) { return true; } 707 708 // Iterators 709 virtual child_iterator child_begin(); 710 virtual child_iterator child_end(); 711 712 friend class ASTStmtReader; 713 friend class ASTStmtWriter; 714}; 715 716/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 717class PredefinedExpr : public Expr { 718public: 719 enum IdentType { 720 Func, 721 Function, 722 PrettyFunction, 723 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 724 /// 'virtual' keyword is omitted for virtual member functions. 725 PrettyFunctionNoVirtual 726 }; 727 728private: 729 SourceLocation Loc; 730 IdentType Type; 731public: 732 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 733 : Expr(PredefinedExprClass, type, type->isDependentType(), 734 type->isDependentType()), Loc(l), Type(IT) {} 735 736 /// \brief Construct an empty predefined expression. 737 explicit PredefinedExpr(EmptyShell Empty) 738 : Expr(PredefinedExprClass, Empty) { } 739 740 IdentType getIdentType() const { return Type; } 741 void setIdentType(IdentType IT) { Type = IT; } 742 743 SourceLocation getLocation() const { return Loc; } 744 void setLocation(SourceLocation L) { Loc = L; } 745 746 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 747 748 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 749 750 static bool classof(const Stmt *T) { 751 return T->getStmtClass() == PredefinedExprClass; 752 } 753 static bool classof(const PredefinedExpr *) { return true; } 754 755 // Iterators 756 virtual child_iterator child_begin(); 757 virtual child_iterator child_end(); 758}; 759 760/// \brief Used by IntegerLiteral/FloatingLiteral to store the numeric without 761/// leaking memory. 762/// 763/// For large floats/integers, APFloat/APInt will allocate memory from the heap 764/// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator 765/// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with 766/// the APFloat/APInt values will never get freed. APNumericStorage uses 767/// ASTContext's allocator for memory allocation. 768class APNumericStorage { 769 unsigned BitWidth; 770 union { 771 uint64_t VAL; ///< Used to store the <= 64 bits integer value. 772 uint64_t *pVal; ///< Used to store the >64 bits integer value. 773 }; 774 775 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; } 776 777 APNumericStorage(const APNumericStorage&); // do not implement 778 APNumericStorage& operator=(const APNumericStorage&); // do not implement 779 780protected: 781 APNumericStorage() : BitWidth(0), VAL(0) { } 782 783 llvm::APInt getIntValue() const { 784 unsigned NumWords = llvm::APInt::getNumWords(BitWidth); 785 if (NumWords > 1) 786 return llvm::APInt(BitWidth, NumWords, pVal); 787 else 788 return llvm::APInt(BitWidth, VAL); 789 } 790 void setIntValue(ASTContext &C, const llvm::APInt &Val); 791}; 792 793class APIntStorage : public APNumericStorage { 794public: 795 llvm::APInt getValue() const { return getIntValue(); } 796 void setValue(ASTContext &C, const llvm::APInt &Val) { setIntValue(C, Val); } 797}; 798 799class APFloatStorage : public APNumericStorage { 800public: 801 llvm::APFloat getValue() const { return llvm::APFloat(getIntValue()); } 802 void setValue(ASTContext &C, const llvm::APFloat &Val) { 803 setIntValue(C, Val.bitcastToAPInt()); 804 } 805}; 806 807class IntegerLiteral : public Expr { 808 APIntStorage Num; 809 SourceLocation Loc; 810 811 /// \brief Construct an empty integer literal. 812 explicit IntegerLiteral(EmptyShell Empty) 813 : Expr(IntegerLiteralClass, Empty) { } 814 815public: 816 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 817 // or UnsignedLongLongTy 818 IntegerLiteral(ASTContext &C, const llvm::APInt &V, 819 QualType type, SourceLocation l) 820 : Expr(IntegerLiteralClass, type, false, false), Loc(l) { 821 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 822 setValue(C, V); 823 } 824 825 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 826 // or UnsignedLongLongTy 827 static IntegerLiteral *Create(ASTContext &C, const llvm::APInt &V, 828 QualType type, SourceLocation l); 829 static IntegerLiteral *Create(ASTContext &C, EmptyShell Empty); 830 831 llvm::APInt getValue() const { return Num.getValue(); } 832 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 833 834 /// \brief Retrieve the location of the literal. 835 SourceLocation getLocation() const { return Loc; } 836 837 void setValue(ASTContext &C, const llvm::APInt &Val) { Num.setValue(C, Val); } 838 void setLocation(SourceLocation Location) { Loc = Location; } 839 840 static bool classof(const Stmt *T) { 841 return T->getStmtClass() == IntegerLiteralClass; 842 } 843 static bool classof(const IntegerLiteral *) { return true; } 844 845 // Iterators 846 virtual child_iterator child_begin(); 847 virtual child_iterator child_end(); 848}; 849 850class CharacterLiteral : public Expr { 851 unsigned Value; 852 SourceLocation Loc; 853 bool IsWide; 854public: 855 // type should be IntTy 856 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 857 : Expr(CharacterLiteralClass, type, false, false), Value(value), Loc(l), 858 IsWide(iswide) { 859 } 860 861 /// \brief Construct an empty character literal. 862 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 863 864 SourceLocation getLocation() const { return Loc; } 865 bool isWide() const { return IsWide; } 866 867 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 868 869 unsigned getValue() const { return Value; } 870 871 void setLocation(SourceLocation Location) { Loc = Location; } 872 void setWide(bool W) { IsWide = W; } 873 void setValue(unsigned Val) { Value = Val; } 874 875 static bool classof(const Stmt *T) { 876 return T->getStmtClass() == CharacterLiteralClass; 877 } 878 static bool classof(const CharacterLiteral *) { return true; } 879 880 // Iterators 881 virtual child_iterator child_begin(); 882 virtual child_iterator child_end(); 883}; 884 885class FloatingLiteral : public Expr { 886 APFloatStorage Num; 887 bool IsExact : 1; 888 SourceLocation Loc; 889 890 FloatingLiteral(ASTContext &C, const llvm::APFloat &V, bool isexact, 891 QualType Type, SourceLocation L) 892 : Expr(FloatingLiteralClass, Type, false, false), 893 IsExact(isexact), Loc(L) { 894 setValue(C, V); 895 } 896 897 /// \brief Construct an empty floating-point literal. 898 explicit FloatingLiteral(EmptyShell Empty) 899 : Expr(FloatingLiteralClass, Empty), IsExact(false) { } 900 901public: 902 static FloatingLiteral *Create(ASTContext &C, const llvm::APFloat &V, 903 bool isexact, QualType Type, SourceLocation L); 904 static FloatingLiteral *Create(ASTContext &C, EmptyShell Empty); 905 906 llvm::APFloat getValue() const { return Num.getValue(); } 907 void setValue(ASTContext &C, const llvm::APFloat &Val) { 908 Num.setValue(C, Val); 909 } 910 911 bool isExact() const { return IsExact; } 912 void setExact(bool E) { IsExact = E; } 913 914 /// getValueAsApproximateDouble - This returns the value as an inaccurate 915 /// double. Note that this may cause loss of precision, but is useful for 916 /// debugging dumps, etc. 917 double getValueAsApproximateDouble() const; 918 919 SourceLocation getLocation() const { return Loc; } 920 void setLocation(SourceLocation L) { Loc = L; } 921 922 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 923 924 static bool classof(const Stmt *T) { 925 return T->getStmtClass() == FloatingLiteralClass; 926 } 927 static bool classof(const FloatingLiteral *) { return true; } 928 929 // Iterators 930 virtual child_iterator child_begin(); 931 virtual child_iterator child_end(); 932}; 933 934/// ImaginaryLiteral - We support imaginary integer and floating point literals, 935/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 936/// IntegerLiteral classes. Instances of this class always have a Complex type 937/// whose element type matches the subexpression. 938/// 939class ImaginaryLiteral : public Expr { 940 Stmt *Val; 941public: 942 ImaginaryLiteral(Expr *val, QualType Ty) 943 : Expr(ImaginaryLiteralClass, Ty, false, false), Val(val) {} 944 945 /// \brief Build an empty imaginary literal. 946 explicit ImaginaryLiteral(EmptyShell Empty) 947 : Expr(ImaginaryLiteralClass, Empty) { } 948 949 const Expr *getSubExpr() const { return cast<Expr>(Val); } 950 Expr *getSubExpr() { return cast<Expr>(Val); } 951 void setSubExpr(Expr *E) { Val = E; } 952 953 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 954 static bool classof(const Stmt *T) { 955 return T->getStmtClass() == ImaginaryLiteralClass; 956 } 957 static bool classof(const ImaginaryLiteral *) { return true; } 958 959 // Iterators 960 virtual child_iterator child_begin(); 961 virtual child_iterator child_end(); 962}; 963 964/// StringLiteral - This represents a string literal expression, e.g. "foo" 965/// or L"bar" (wide strings). The actual string is returned by getStrData() 966/// is NOT null-terminated, and the length of the string is determined by 967/// calling getByteLength(). The C type for a string is always a 968/// ConstantArrayType. In C++, the char type is const qualified, in C it is 969/// not. 970/// 971/// Note that strings in C can be formed by concatenation of multiple string 972/// literal pptokens in translation phase #6. This keeps track of the locations 973/// of each of these pieces. 974/// 975/// Strings in C can also be truncated and extended by assigning into arrays, 976/// e.g. with constructs like: 977/// char X[2] = "foobar"; 978/// In this case, getByteLength() will return 6, but the string literal will 979/// have type "char[2]". 980class StringLiteral : public Expr { 981 const char *StrData; 982 unsigned ByteLength; 983 bool IsWide; 984 unsigned NumConcatenated; 985 SourceLocation TokLocs[1]; 986 987 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty, false, false) {} 988 989public: 990 /// This is the "fully general" constructor that allows representation of 991 /// strings formed from multiple concatenated tokens. 992 static StringLiteral *Create(ASTContext &C, const char *StrData, 993 unsigned ByteLength, bool Wide, QualType Ty, 994 const SourceLocation *Loc, unsigned NumStrs); 995 996 /// Simple constructor for string literals made from one token. 997 static StringLiteral *Create(ASTContext &C, const char *StrData, 998 unsigned ByteLength, 999 bool Wide, QualType Ty, SourceLocation Loc) { 1000 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 1001 } 1002 1003 /// \brief Construct an empty string literal. 1004 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 1005 1006 llvm::StringRef getString() const { 1007 return llvm::StringRef(StrData, ByteLength); 1008 } 1009 1010 unsigned getByteLength() const { return ByteLength; } 1011 1012 /// \brief Sets the string data to the given string data. 1013 void setString(ASTContext &C, llvm::StringRef Str); 1014 1015 bool isWide() const { return IsWide; } 1016 void setWide(bool W) { IsWide = W; } 1017 1018 bool containsNonAsciiOrNull() const { 1019 llvm::StringRef Str = getString(); 1020 for (unsigned i = 0, e = Str.size(); i != e; ++i) 1021 if (!isascii(Str[i]) || !Str[i]) 1022 return true; 1023 return false; 1024 } 1025 /// getNumConcatenated - Get the number of string literal tokens that were 1026 /// concatenated in translation phase #6 to form this string literal. 1027 unsigned getNumConcatenated() const { return NumConcatenated; } 1028 1029 SourceLocation getStrTokenLoc(unsigned TokNum) const { 1030 assert(TokNum < NumConcatenated && "Invalid tok number"); 1031 return TokLocs[TokNum]; 1032 } 1033 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 1034 assert(TokNum < NumConcatenated && "Invalid tok number"); 1035 TokLocs[TokNum] = L; 1036 } 1037 1038 typedef const SourceLocation *tokloc_iterator; 1039 tokloc_iterator tokloc_begin() const { return TokLocs; } 1040 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1041 1042 virtual SourceRange getSourceRange() const { 1043 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1044 } 1045 static bool classof(const Stmt *T) { 1046 return T->getStmtClass() == StringLiteralClass; 1047 } 1048 static bool classof(const StringLiteral *) { return true; } 1049 1050 // Iterators 1051 virtual child_iterator child_begin(); 1052 virtual child_iterator child_end(); 1053}; 1054 1055/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1056/// AST node is only formed if full location information is requested. 1057class ParenExpr : public Expr { 1058 SourceLocation L, R; 1059 Stmt *Val; 1060public: 1061 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1062 : Expr(ParenExprClass, val->getType(), 1063 val->isTypeDependent(), val->isValueDependent()), 1064 L(l), R(r), Val(val) {} 1065 1066 /// \brief Construct an empty parenthesized expression. 1067 explicit ParenExpr(EmptyShell Empty) 1068 : Expr(ParenExprClass, Empty) { } 1069 1070 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1071 Expr *getSubExpr() { return cast<Expr>(Val); } 1072 void setSubExpr(Expr *E) { Val = E; } 1073 1074 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 1075 1076 /// \brief Get the location of the left parentheses '('. 1077 SourceLocation getLParen() const { return L; } 1078 void setLParen(SourceLocation Loc) { L = Loc; } 1079 1080 /// \brief Get the location of the right parentheses ')'. 1081 SourceLocation getRParen() const { return R; } 1082 void setRParen(SourceLocation Loc) { R = Loc; } 1083 1084 static bool classof(const Stmt *T) { 1085 return T->getStmtClass() == ParenExprClass; 1086 } 1087 static bool classof(const ParenExpr *) { return true; } 1088 1089 // Iterators 1090 virtual child_iterator child_begin(); 1091 virtual child_iterator child_end(); 1092}; 1093 1094 1095/// UnaryOperator - This represents the unary-expression's (except sizeof and 1096/// alignof), the postinc/postdec operators from postfix-expression, and various 1097/// extensions. 1098/// 1099/// Notes on various nodes: 1100/// 1101/// Real/Imag - These return the real/imag part of a complex operand. If 1102/// applied to a non-complex value, the former returns its operand and the 1103/// later returns zero in the type of the operand. 1104/// 1105class UnaryOperator : public Expr { 1106public: 1107 typedef UnaryOperatorKind Opcode; 1108 1109private: 1110 unsigned Opc : 5; 1111 SourceLocation Loc; 1112 Stmt *Val; 1113public: 1114 1115 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 1116 : Expr(UnaryOperatorClass, type, 1117 input->isTypeDependent() || type->isDependentType(), 1118 input->isValueDependent()), 1119 Opc(opc), Loc(l), Val(input) {} 1120 1121 /// \brief Build an empty unary operator. 1122 explicit UnaryOperator(EmptyShell Empty) 1123 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1124 1125 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1126 void setOpcode(Opcode O) { Opc = O; } 1127 1128 Expr *getSubExpr() const { return cast<Expr>(Val); } 1129 void setSubExpr(Expr *E) { Val = E; } 1130 1131 /// getOperatorLoc - Return the location of the operator. 1132 SourceLocation getOperatorLoc() const { return Loc; } 1133 void setOperatorLoc(SourceLocation L) { Loc = L; } 1134 1135 /// isPostfix - Return true if this is a postfix operation, like x++. 1136 static bool isPostfix(Opcode Op) { 1137 return Op == UO_PostInc || Op == UO_PostDec; 1138 } 1139 1140 /// isPostfix - Return true if this is a prefix operation, like --x. 1141 static bool isPrefix(Opcode Op) { 1142 return Op == UO_PreInc || Op == UO_PreDec; 1143 } 1144 1145 bool isPrefix() const { return isPrefix(getOpcode()); } 1146 bool isPostfix() const { return isPostfix(getOpcode()); } 1147 bool isIncrementOp() const { 1148 return Opc == UO_PreInc || Opc == UO_PostInc; 1149 } 1150 bool isIncrementDecrementOp() const { 1151 return Opc <= UO_PreDec; 1152 } 1153 static bool isArithmeticOp(Opcode Op) { 1154 return Op >= UO_Plus && Op <= UO_LNot; 1155 } 1156 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1157 1158 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1159 /// corresponds to, e.g. "sizeof" or "[pre]++" 1160 static const char *getOpcodeStr(Opcode Op); 1161 1162 /// \brief Retrieve the unary opcode that corresponds to the given 1163 /// overloaded operator. 1164 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1165 1166 /// \brief Retrieve the overloaded operator kind that corresponds to 1167 /// the given unary opcode. 1168 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1169 1170 virtual SourceRange getSourceRange() const { 1171 if (isPostfix()) 1172 return SourceRange(Val->getLocStart(), Loc); 1173 else 1174 return SourceRange(Loc, Val->getLocEnd()); 1175 } 1176 virtual SourceLocation getExprLoc() const { return Loc; } 1177 1178 static bool classof(const Stmt *T) { 1179 return T->getStmtClass() == UnaryOperatorClass; 1180 } 1181 static bool classof(const UnaryOperator *) { return true; } 1182 1183 // Iterators 1184 virtual child_iterator child_begin(); 1185 virtual child_iterator child_end(); 1186}; 1187 1188/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1189/// offsetof(record-type, member-designator). For example, given: 1190/// @code 1191/// struct S { 1192/// float f; 1193/// double d; 1194/// }; 1195/// struct T { 1196/// int i; 1197/// struct S s[10]; 1198/// }; 1199/// @endcode 1200/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1201 1202class OffsetOfExpr : public Expr { 1203public: 1204 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1205 class OffsetOfNode { 1206 public: 1207 /// \brief The kind of offsetof node we have. 1208 enum Kind { 1209 /// \brief An index into an array. 1210 Array = 0x00, 1211 /// \brief A field. 1212 Field = 0x01, 1213 /// \brief A field in a dependent type, known only by its name. 1214 Identifier = 0x02, 1215 /// \brief An implicit indirection through a C++ base class, when the 1216 /// field found is in a base class. 1217 Base = 0x03 1218 }; 1219 1220 private: 1221 enum { MaskBits = 2, Mask = 0x03 }; 1222 1223 /// \brief The source range that covers this part of the designator. 1224 SourceRange Range; 1225 1226 /// \brief The data describing the designator, which comes in three 1227 /// different forms, depending on the lower two bits. 1228 /// - An unsigned index into the array of Expr*'s stored after this node 1229 /// in memory, for [constant-expression] designators. 1230 /// - A FieldDecl*, for references to a known field. 1231 /// - An IdentifierInfo*, for references to a field with a given name 1232 /// when the class type is dependent. 1233 /// - A CXXBaseSpecifier*, for references that look at a field in a 1234 /// base class. 1235 uintptr_t Data; 1236 1237 public: 1238 /// \brief Create an offsetof node that refers to an array element. 1239 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1240 SourceLocation RBracketLoc) 1241 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1242 1243 /// \brief Create an offsetof node that refers to a field. 1244 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1245 SourceLocation NameLoc) 1246 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1247 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1248 1249 /// \brief Create an offsetof node that refers to an identifier. 1250 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1251 SourceLocation NameLoc) 1252 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1253 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1254 1255 /// \brief Create an offsetof node that refers into a C++ base class. 1256 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1257 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1258 1259 /// \brief Determine what kind of offsetof node this is. 1260 Kind getKind() const { 1261 return static_cast<Kind>(Data & Mask); 1262 } 1263 1264 /// \brief For an array element node, returns the index into the array 1265 /// of expressions. 1266 unsigned getArrayExprIndex() const { 1267 assert(getKind() == Array); 1268 return Data >> 2; 1269 } 1270 1271 /// \brief For a field offsetof node, returns the field. 1272 FieldDecl *getField() const { 1273 assert(getKind() == Field); 1274 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1275 } 1276 1277 /// \brief For a field or identifier offsetof node, returns the name of 1278 /// the field. 1279 IdentifierInfo *getFieldName() const; 1280 1281 /// \brief For a base class node, returns the base specifier. 1282 CXXBaseSpecifier *getBase() const { 1283 assert(getKind() == Base); 1284 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1285 } 1286 1287 /// \brief Retrieve the source range that covers this offsetof node. 1288 /// 1289 /// For an array element node, the source range contains the locations of 1290 /// the square brackets. For a field or identifier node, the source range 1291 /// contains the location of the period (if there is one) and the 1292 /// identifier. 1293 SourceRange getRange() const { return Range; } 1294 }; 1295 1296private: 1297 1298 SourceLocation OperatorLoc, RParenLoc; 1299 // Base type; 1300 TypeSourceInfo *TSInfo; 1301 // Number of sub-components (i.e. instances of OffsetOfNode). 1302 unsigned NumComps; 1303 // Number of sub-expressions (i.e. array subscript expressions). 1304 unsigned NumExprs; 1305 1306 OffsetOfExpr(ASTContext &C, QualType type, 1307 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1308 OffsetOfNode* compsPtr, unsigned numComps, 1309 Expr** exprsPtr, unsigned numExprs, 1310 SourceLocation RParenLoc); 1311 1312 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1313 : Expr(OffsetOfExprClass, EmptyShell()), 1314 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1315 1316public: 1317 1318 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1319 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1320 OffsetOfNode* compsPtr, unsigned numComps, 1321 Expr** exprsPtr, unsigned numExprs, 1322 SourceLocation RParenLoc); 1323 1324 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1325 unsigned NumComps, unsigned NumExprs); 1326 1327 /// getOperatorLoc - Return the location of the operator. 1328 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1329 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1330 1331 /// \brief Return the location of the right parentheses. 1332 SourceLocation getRParenLoc() const { return RParenLoc; } 1333 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1334 1335 TypeSourceInfo *getTypeSourceInfo() const { 1336 return TSInfo; 1337 } 1338 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1339 TSInfo = tsi; 1340 } 1341 1342 const OffsetOfNode &getComponent(unsigned Idx) { 1343 assert(Idx < NumComps && "Subscript out of range"); 1344 return reinterpret_cast<OffsetOfNode *> (this + 1)[Idx]; 1345 } 1346 1347 void setComponent(unsigned Idx, OffsetOfNode ON) { 1348 assert(Idx < NumComps && "Subscript out of range"); 1349 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1350 } 1351 1352 unsigned getNumComponents() const { 1353 return NumComps; 1354 } 1355 1356 Expr* getIndexExpr(unsigned Idx) { 1357 assert(Idx < NumExprs && "Subscript out of range"); 1358 return reinterpret_cast<Expr **>( 1359 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1360 } 1361 1362 void setIndexExpr(unsigned Idx, Expr* E) { 1363 assert(Idx < NumComps && "Subscript out of range"); 1364 reinterpret_cast<Expr **>( 1365 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1366 } 1367 1368 unsigned getNumExpressions() const { 1369 return NumExprs; 1370 } 1371 1372 virtual SourceRange getSourceRange() const { 1373 return SourceRange(OperatorLoc, RParenLoc); 1374 } 1375 1376 static bool classof(const Stmt *T) { 1377 return T->getStmtClass() == OffsetOfExprClass; 1378 } 1379 1380 static bool classof(const OffsetOfExpr *) { return true; } 1381 1382 // Iterators 1383 virtual child_iterator child_begin(); 1384 virtual child_iterator child_end(); 1385}; 1386 1387/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1388/// types and expressions. 1389class SizeOfAlignOfExpr : public Expr { 1390 bool isSizeof : 1; // true if sizeof, false if alignof. 1391 bool isType : 1; // true if operand is a type, false if an expression 1392 union { 1393 TypeSourceInfo *Ty; 1394 Stmt *Ex; 1395 } Argument; 1396 SourceLocation OpLoc, RParenLoc; 1397 1398public: 1399 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 1400 QualType resultType, SourceLocation op, 1401 SourceLocation rp) : 1402 Expr(SizeOfAlignOfExprClass, resultType, 1403 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1404 // Value-dependent if the argument is type-dependent. 1405 TInfo->getType()->isDependentType()), 1406 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1407 Argument.Ty = TInfo; 1408 } 1409 1410 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1411 QualType resultType, SourceLocation op, 1412 SourceLocation rp) : 1413 Expr(SizeOfAlignOfExprClass, resultType, 1414 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1415 // Value-dependent if the argument is type-dependent. 1416 E->isTypeDependent()), 1417 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1418 Argument.Ex = E; 1419 } 1420 1421 /// \brief Construct an empty sizeof/alignof expression. 1422 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1423 : Expr(SizeOfAlignOfExprClass, Empty) { } 1424 1425 bool isSizeOf() const { return isSizeof; } 1426 void setSizeof(bool S) { isSizeof = S; } 1427 1428 bool isArgumentType() const { return isType; } 1429 QualType getArgumentType() const { 1430 return getArgumentTypeInfo()->getType(); 1431 } 1432 TypeSourceInfo *getArgumentTypeInfo() const { 1433 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1434 return Argument.Ty; 1435 } 1436 Expr *getArgumentExpr() { 1437 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1438 return static_cast<Expr*>(Argument.Ex); 1439 } 1440 const Expr *getArgumentExpr() const { 1441 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1442 } 1443 1444 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1445 void setArgument(TypeSourceInfo *TInfo) { 1446 Argument.Ty = TInfo; 1447 isType = true; 1448 } 1449 1450 /// Gets the argument type, or the type of the argument expression, whichever 1451 /// is appropriate. 1452 QualType getTypeOfArgument() const { 1453 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1454 } 1455 1456 SourceLocation getOperatorLoc() const { return OpLoc; } 1457 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1458 1459 SourceLocation getRParenLoc() const { return RParenLoc; } 1460 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1461 1462 virtual SourceRange getSourceRange() const { 1463 return SourceRange(OpLoc, RParenLoc); 1464 } 1465 1466 static bool classof(const Stmt *T) { 1467 return T->getStmtClass() == SizeOfAlignOfExprClass; 1468 } 1469 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1470 1471 // Iterators 1472 virtual child_iterator child_begin(); 1473 virtual child_iterator child_end(); 1474}; 1475 1476//===----------------------------------------------------------------------===// 1477// Postfix Operators. 1478//===----------------------------------------------------------------------===// 1479 1480/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1481class ArraySubscriptExpr : public Expr { 1482 enum { LHS, RHS, END_EXPR=2 }; 1483 Stmt* SubExprs[END_EXPR]; 1484 SourceLocation RBracketLoc; 1485public: 1486 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1487 SourceLocation rbracketloc) 1488 : Expr(ArraySubscriptExprClass, t, 1489 lhs->isTypeDependent() || rhs->isTypeDependent(), 1490 lhs->isValueDependent() || rhs->isValueDependent()), 1491 RBracketLoc(rbracketloc) { 1492 SubExprs[LHS] = lhs; 1493 SubExprs[RHS] = rhs; 1494 } 1495 1496 /// \brief Create an empty array subscript expression. 1497 explicit ArraySubscriptExpr(EmptyShell Shell) 1498 : Expr(ArraySubscriptExprClass, Shell) { } 1499 1500 /// An array access can be written A[4] or 4[A] (both are equivalent). 1501 /// - getBase() and getIdx() always present the normalized view: A[4]. 1502 /// In this case getBase() returns "A" and getIdx() returns "4". 1503 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1504 /// 4[A] getLHS() returns "4". 1505 /// Note: Because vector element access is also written A[4] we must 1506 /// predicate the format conversion in getBase and getIdx only on the 1507 /// the type of the RHS, as it is possible for the LHS to be a vector of 1508 /// integer type 1509 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1510 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1511 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1512 1513 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1514 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1515 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1516 1517 Expr *getBase() { 1518 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1519 } 1520 1521 const Expr *getBase() const { 1522 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1523 } 1524 1525 Expr *getIdx() { 1526 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1527 } 1528 1529 const Expr *getIdx() const { 1530 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1531 } 1532 1533 virtual SourceRange getSourceRange() const { 1534 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1535 } 1536 1537 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1538 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1539 1540 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1541 1542 static bool classof(const Stmt *T) { 1543 return T->getStmtClass() == ArraySubscriptExprClass; 1544 } 1545 static bool classof(const ArraySubscriptExpr *) { return true; } 1546 1547 // Iterators 1548 virtual child_iterator child_begin(); 1549 virtual child_iterator child_end(); 1550}; 1551 1552 1553/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1554/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1555/// while its subclasses may represent alternative syntax that (semantically) 1556/// results in a function call. For example, CXXOperatorCallExpr is 1557/// a subclass for overloaded operator calls that use operator syntax, e.g., 1558/// "str1 + str2" to resolve to a function call. 1559class CallExpr : public Expr { 1560 enum { FN=0, ARGS_START=1 }; 1561 Stmt **SubExprs; 1562 unsigned NumArgs; 1563 SourceLocation RParenLoc; 1564 1565protected: 1566 // This version of the constructor is for derived classes. 1567 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1568 QualType t, SourceLocation rparenloc); 1569 1570public: 1571 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1572 SourceLocation rparenloc); 1573 1574 /// \brief Build an empty call expression. 1575 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1576 1577 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1578 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1579 void setCallee(Expr *F) { SubExprs[FN] = F; } 1580 1581 Decl *getCalleeDecl(); 1582 const Decl *getCalleeDecl() const { 1583 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1584 } 1585 1586 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1587 FunctionDecl *getDirectCallee(); 1588 const FunctionDecl *getDirectCallee() const { 1589 return const_cast<CallExpr*>(this)->getDirectCallee(); 1590 } 1591 1592 /// getNumArgs - Return the number of actual arguments to this call. 1593 /// 1594 unsigned getNumArgs() const { return NumArgs; } 1595 1596 /// getArg - Return the specified argument. 1597 Expr *getArg(unsigned Arg) { 1598 assert(Arg < NumArgs && "Arg access out of range!"); 1599 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1600 } 1601 const Expr *getArg(unsigned Arg) const { 1602 assert(Arg < NumArgs && "Arg access out of range!"); 1603 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1604 } 1605 1606 /// setArg - Set the specified argument. 1607 void setArg(unsigned Arg, Expr *ArgExpr) { 1608 assert(Arg < NumArgs && "Arg access out of range!"); 1609 SubExprs[Arg+ARGS_START] = ArgExpr; 1610 } 1611 1612 /// setNumArgs - This changes the number of arguments present in this call. 1613 /// Any orphaned expressions are deleted by this, and any new operands are set 1614 /// to null. 1615 void setNumArgs(ASTContext& C, unsigned NumArgs); 1616 1617 typedef ExprIterator arg_iterator; 1618 typedef ConstExprIterator const_arg_iterator; 1619 1620 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1621 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1622 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1623 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1624 1625 /// getNumCommas - Return the number of commas that must have been present in 1626 /// this function call. 1627 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1628 1629 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1630 /// not, return 0. 1631 unsigned isBuiltinCall(ASTContext &Context) const; 1632 1633 /// getCallReturnType - Get the return type of the call expr. This is not 1634 /// always the type of the expr itself, if the return type is a reference 1635 /// type. 1636 QualType getCallReturnType() const; 1637 1638 SourceLocation getRParenLoc() const { return RParenLoc; } 1639 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1640 1641 virtual SourceRange getSourceRange() const { 1642 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1643 } 1644 1645 static bool classof(const Stmt *T) { 1646 return T->getStmtClass() >= firstCallExprConstant && 1647 T->getStmtClass() <= lastCallExprConstant; 1648 } 1649 static bool classof(const CallExpr *) { return true; } 1650 1651 // Iterators 1652 virtual child_iterator child_begin(); 1653 virtual child_iterator child_end(); 1654}; 1655 1656/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1657/// 1658class MemberExpr : public Expr { 1659 /// Extra data stored in some member expressions. 1660 struct MemberNameQualifier : public NameQualifier { 1661 DeclAccessPair FoundDecl; 1662 }; 1663 1664 /// Base - the expression for the base pointer or structure references. In 1665 /// X.F, this is "X". 1666 Stmt *Base; 1667 1668 /// MemberDecl - This is the decl being referenced by the field/member name. 1669 /// In X.F, this is the decl referenced by F. 1670 ValueDecl *MemberDecl; 1671 1672 /// MemberLoc - This is the location of the member name. 1673 SourceLocation MemberLoc; 1674 1675 /// MemberDNLoc - Provides source/type location info for the 1676 /// declaration name embedded in MemberDecl. 1677 DeclarationNameLoc MemberDNLoc; 1678 1679 /// IsArrow - True if this is "X->F", false if this is "X.F". 1680 bool IsArrow : 1; 1681 1682 /// \brief True if this member expression used a nested-name-specifier to 1683 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1684 /// declaration. When true, a MemberNameQualifier 1685 /// structure is allocated immediately after the MemberExpr. 1686 bool HasQualifierOrFoundDecl : 1; 1687 1688 /// \brief True if this member expression specified a template argument list 1689 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1690 /// structure (and its TemplateArguments) are allocated immediately after 1691 /// the MemberExpr or, if the member expression also has a qualifier, after 1692 /// the MemberNameQualifier structure. 1693 bool HasExplicitTemplateArgumentList : 1; 1694 1695 /// \brief Retrieve the qualifier that preceded the member name, if any. 1696 MemberNameQualifier *getMemberQualifier() { 1697 assert(HasQualifierOrFoundDecl); 1698 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1699 } 1700 1701 /// \brief Retrieve the qualifier that preceded the member name, if any. 1702 const MemberNameQualifier *getMemberQualifier() const { 1703 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1704 } 1705 1706public: 1707 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1708 const DeclarationNameInfo &NameInfo, QualType ty) 1709 : Expr(MemberExprClass, ty, 1710 base->isTypeDependent(), base->isValueDependent()), 1711 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 1712 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 1713 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) { 1714 assert(memberdecl->getDeclName() == NameInfo.getName()); 1715 } 1716 1717 // NOTE: this constructor should be used only when it is known that 1718 // the member name can not provide additional syntactic info 1719 // (i.e., source locations for C++ operator names or type source info 1720 // for constructors, destructors and conversion oeprators). 1721 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1722 SourceLocation l, QualType ty) 1723 : Expr(MemberExprClass, ty, 1724 base->isTypeDependent(), base->isValueDependent()), 1725 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 1726 IsArrow(isarrow), 1727 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1728 1729 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1730 NestedNameSpecifier *qual, SourceRange qualrange, 1731 ValueDecl *memberdecl, DeclAccessPair founddecl, 1732 DeclarationNameInfo MemberNameInfo, 1733 const TemplateArgumentListInfo *targs, 1734 QualType ty); 1735 1736 void setBase(Expr *E) { Base = E; } 1737 Expr *getBase() const { return cast<Expr>(Base); } 1738 1739 /// \brief Retrieve the member declaration to which this expression refers. 1740 /// 1741 /// The returned declaration will either be a FieldDecl or (in C++) 1742 /// a CXXMethodDecl. 1743 ValueDecl *getMemberDecl() const { return MemberDecl; } 1744 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1745 1746 /// \brief Retrieves the declaration found by lookup. 1747 DeclAccessPair getFoundDecl() const { 1748 if (!HasQualifierOrFoundDecl) 1749 return DeclAccessPair::make(getMemberDecl(), 1750 getMemberDecl()->getAccess()); 1751 return getMemberQualifier()->FoundDecl; 1752 } 1753 1754 /// \brief Determines whether this member expression actually had 1755 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1756 /// x->Base::foo. 1757 bool hasQualifier() const { return getQualifier() != 0; } 1758 1759 /// \brief If the member name was qualified, retrieves the source range of 1760 /// the nested-name-specifier that precedes the member name. Otherwise, 1761 /// returns an empty source range. 1762 SourceRange getQualifierRange() const { 1763 if (!HasQualifierOrFoundDecl) 1764 return SourceRange(); 1765 1766 return getMemberQualifier()->Range; 1767 } 1768 1769 /// \brief If the member name was qualified, retrieves the 1770 /// nested-name-specifier that precedes the member name. Otherwise, returns 1771 /// NULL. 1772 NestedNameSpecifier *getQualifier() const { 1773 if (!HasQualifierOrFoundDecl) 1774 return 0; 1775 1776 return getMemberQualifier()->NNS; 1777 } 1778 1779 /// \brief Determines whether this member expression actually had a C++ 1780 /// template argument list explicitly specified, e.g., x.f<int>. 1781 bool hasExplicitTemplateArgs() const { 1782 return HasExplicitTemplateArgumentList; 1783 } 1784 1785 /// \brief Copies the template arguments (if present) into the given 1786 /// structure. 1787 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1788 if (hasExplicitTemplateArgs()) 1789 getExplicitTemplateArgs().copyInto(List); 1790 } 1791 1792 /// \brief Retrieve the explicit template argument list that 1793 /// follow the member template name. This must only be called on an 1794 /// expression with explicit template arguments. 1795 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 1796 assert(HasExplicitTemplateArgumentList); 1797 if (!HasQualifierOrFoundDecl) 1798 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1799 1800 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 1801 getMemberQualifier() + 1); 1802 } 1803 1804 /// \brief Retrieve the explicit template argument list that 1805 /// followed the member template name. This must only be called on 1806 /// an expression with explicit template arguments. 1807 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 1808 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 1809 } 1810 1811 /// \brief Retrieves the optional explicit template arguments. 1812 /// This points to the same data as getExplicitTemplateArgs(), but 1813 /// returns null if there are no explicit template arguments. 1814 const ExplicitTemplateArgumentList *getOptionalExplicitTemplateArgs() const { 1815 if (!hasExplicitTemplateArgs()) return 0; 1816 return &getExplicitTemplateArgs(); 1817 } 1818 1819 /// \brief Retrieve the location of the left angle bracket following the 1820 /// member name ('<'), if any. 1821 SourceLocation getLAngleLoc() const { 1822 if (!HasExplicitTemplateArgumentList) 1823 return SourceLocation(); 1824 1825 return getExplicitTemplateArgs().LAngleLoc; 1826 } 1827 1828 /// \brief Retrieve the template arguments provided as part of this 1829 /// template-id. 1830 const TemplateArgumentLoc *getTemplateArgs() const { 1831 if (!HasExplicitTemplateArgumentList) 1832 return 0; 1833 1834 return getExplicitTemplateArgs().getTemplateArgs(); 1835 } 1836 1837 /// \brief Retrieve the number of template arguments provided as part of this 1838 /// template-id. 1839 unsigned getNumTemplateArgs() const { 1840 if (!HasExplicitTemplateArgumentList) 1841 return 0; 1842 1843 return getExplicitTemplateArgs().NumTemplateArgs; 1844 } 1845 1846 /// \brief Retrieve the location of the right angle bracket following the 1847 /// template arguments ('>'). 1848 SourceLocation getRAngleLoc() const { 1849 if (!HasExplicitTemplateArgumentList) 1850 return SourceLocation(); 1851 1852 return getExplicitTemplateArgs().RAngleLoc; 1853 } 1854 1855 /// \brief Retrieve the member declaration name info. 1856 DeclarationNameInfo getMemberNameInfo() const { 1857 return DeclarationNameInfo(MemberDecl->getDeclName(), 1858 MemberLoc, MemberDNLoc); 1859 } 1860 1861 bool isArrow() const { return IsArrow; } 1862 void setArrow(bool A) { IsArrow = A; } 1863 1864 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1865 /// location of 'F'. 1866 SourceLocation getMemberLoc() const { return MemberLoc; } 1867 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1868 1869 virtual SourceRange getSourceRange() const { 1870 // If we have an implicit base (like a C++ implicit this), 1871 // make sure not to return its location 1872 SourceLocation EndLoc = (HasExplicitTemplateArgumentList) 1873 ? getRAngleLoc() : getMemberNameInfo().getEndLoc(); 1874 1875 SourceLocation BaseLoc = getBase()->getLocStart(); 1876 if (BaseLoc.isInvalid()) 1877 return SourceRange(MemberLoc, EndLoc); 1878 return SourceRange(BaseLoc, EndLoc); 1879 } 1880 1881 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1882 1883 static bool classof(const Stmt *T) { 1884 return T->getStmtClass() == MemberExprClass; 1885 } 1886 static bool classof(const MemberExpr *) { return true; } 1887 1888 // Iterators 1889 virtual child_iterator child_begin(); 1890 virtual child_iterator child_end(); 1891 1892 friend class ASTReader; 1893 friend class ASTStmtWriter; 1894}; 1895 1896/// CompoundLiteralExpr - [C99 6.5.2.5] 1897/// 1898class CompoundLiteralExpr : public Expr { 1899 /// LParenLoc - If non-null, this is the location of the left paren in a 1900 /// compound literal like "(int){4}". This can be null if this is a 1901 /// synthesized compound expression. 1902 SourceLocation LParenLoc; 1903 1904 /// The type as written. This can be an incomplete array type, in 1905 /// which case the actual expression type will be different. 1906 TypeSourceInfo *TInfo; 1907 Stmt *Init; 1908 bool FileScope; 1909public: 1910 // FIXME: Can compound literals be value-dependent? 1911 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 1912 QualType T, Expr *init, bool fileScope) 1913 : Expr(CompoundLiteralExprClass, T, 1914 tinfo->getType()->isDependentType(), false), 1915 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 1916 1917 /// \brief Construct an empty compound literal. 1918 explicit CompoundLiteralExpr(EmptyShell Empty) 1919 : Expr(CompoundLiteralExprClass, Empty) { } 1920 1921 const Expr *getInitializer() const { return cast<Expr>(Init); } 1922 Expr *getInitializer() { return cast<Expr>(Init); } 1923 void setInitializer(Expr *E) { Init = E; } 1924 1925 bool isFileScope() const { return FileScope; } 1926 void setFileScope(bool FS) { FileScope = FS; } 1927 1928 SourceLocation getLParenLoc() const { return LParenLoc; } 1929 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1930 1931 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 1932 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 1933 1934 virtual SourceRange getSourceRange() const { 1935 // FIXME: Init should never be null. 1936 if (!Init) 1937 return SourceRange(); 1938 if (LParenLoc.isInvalid()) 1939 return Init->getSourceRange(); 1940 return SourceRange(LParenLoc, Init->getLocEnd()); 1941 } 1942 1943 static bool classof(const Stmt *T) { 1944 return T->getStmtClass() == CompoundLiteralExprClass; 1945 } 1946 static bool classof(const CompoundLiteralExpr *) { return true; } 1947 1948 // Iterators 1949 virtual child_iterator child_begin(); 1950 virtual child_iterator child_end(); 1951}; 1952 1953/// CastExpr - Base class for type casts, including both implicit 1954/// casts (ImplicitCastExpr) and explicit casts that have some 1955/// representation in the source code (ExplicitCastExpr's derived 1956/// classes). 1957class CastExpr : public Expr { 1958public: 1959 typedef clang::CastKind CastKind; 1960 1961private: 1962 Stmt *Op; 1963 1964 void CheckCastConsistency() const { 1965#ifndef NDEBUG 1966 switch (getCastKind()) { 1967 case CK_DerivedToBase: 1968 case CK_UncheckedDerivedToBase: 1969 case CK_DerivedToBaseMemberPointer: 1970 case CK_BaseToDerived: 1971 case CK_BaseToDerivedMemberPointer: 1972 assert(!path_empty() && "Cast kind should have a base path!"); 1973 break; 1974 1975 // These should not have an inheritance path. 1976 case CK_BitCast: 1977 case CK_Dynamic: 1978 case CK_ToUnion: 1979 case CK_ArrayToPointerDecay: 1980 case CK_FunctionToPointerDecay: 1981 case CK_NullToMemberPointer: 1982 case CK_NullToPointer: 1983 case CK_ConstructorConversion: 1984 case CK_IntegralToPointer: 1985 case CK_PointerToIntegral: 1986 case CK_ToVoid: 1987 case CK_VectorSplat: 1988 case CK_IntegralCast: 1989 case CK_IntegralToFloating: 1990 case CK_FloatingToIntegral: 1991 case CK_FloatingCast: 1992 case CK_AnyPointerToObjCPointerCast: 1993 case CK_AnyPointerToBlockPointerCast: 1994 case CK_ObjCObjectLValueCast: 1995 case CK_FloatingRealToComplex: 1996 case CK_FloatingComplexToReal: 1997 case CK_FloatingComplexCast: 1998 case CK_FloatingComplexToIntegralComplex: 1999 case CK_IntegralRealToComplex: 2000 case CK_IntegralComplexToReal: 2001 case CK_IntegralComplexCast: 2002 case CK_IntegralComplexToFloatingComplex: 2003 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 2004 // fallthrough to check for null base path 2005 2006 case CK_Dependent: 2007 case CK_Unknown: 2008 case CK_NoOp: 2009 case CK_PointerToBoolean: 2010 case CK_IntegralToBoolean: 2011 case CK_FloatingToBoolean: 2012 case CK_MemberPointerToBoolean: 2013 case CK_FloatingComplexToBoolean: 2014 case CK_IntegralComplexToBoolean: 2015 case CK_LValueBitCast: // -> bool& 2016 case CK_UserDefinedConversion: // operator bool() 2017 assert(path_empty() && "Cast kind should not have a base path!"); 2018 break; 2019 } 2020#endif 2021 } 2022 2023 const CXXBaseSpecifier * const *path_buffer() const { 2024 return const_cast<CastExpr*>(this)->path_buffer(); 2025 } 2026 CXXBaseSpecifier **path_buffer(); 2027 2028protected: 2029 CastExpr(StmtClass SC, QualType ty, const CastKind kind, Expr *op, 2030 unsigned BasePathSize) : 2031 Expr(SC, ty, 2032 // Cast expressions are type-dependent if the type is 2033 // dependent (C++ [temp.dep.expr]p3). 2034 ty->isDependentType(), 2035 // Cast expressions are value-dependent if the type is 2036 // dependent or if the subexpression is value-dependent. 2037 ty->isDependentType() || (op && op->isValueDependent())), 2038 Op(op) { 2039 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2040 CastExprBits.Kind = kind; 2041 CastExprBits.BasePathSize = BasePathSize; 2042 CheckCastConsistency(); 2043 } 2044 2045 /// \brief Construct an empty cast. 2046 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2047 : Expr(SC, Empty) { 2048 CastExprBits.BasePathSize = BasePathSize; 2049 } 2050 2051public: 2052 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2053 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2054 const char *getCastKindName() const; 2055 2056 Expr *getSubExpr() { return cast<Expr>(Op); } 2057 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2058 void setSubExpr(Expr *E) { Op = E; } 2059 2060 /// \brief Retrieve the cast subexpression as it was written in the source 2061 /// code, looking through any implicit casts or other intermediate nodes 2062 /// introduced by semantic analysis. 2063 Expr *getSubExprAsWritten(); 2064 const Expr *getSubExprAsWritten() const { 2065 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2066 } 2067 2068 typedef CXXBaseSpecifier **path_iterator; 2069 typedef const CXXBaseSpecifier * const *path_const_iterator; 2070 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2071 unsigned path_size() const { return CastExprBits.BasePathSize; } 2072 path_iterator path_begin() { return path_buffer(); } 2073 path_iterator path_end() { return path_buffer() + path_size(); } 2074 path_const_iterator path_begin() const { return path_buffer(); } 2075 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2076 2077 void setCastPath(const CXXCastPath &Path); 2078 2079 static bool classof(const Stmt *T) { 2080 return T->getStmtClass() >= firstCastExprConstant && 2081 T->getStmtClass() <= lastCastExprConstant; 2082 } 2083 static bool classof(const CastExpr *) { return true; } 2084 2085 // Iterators 2086 virtual child_iterator child_begin(); 2087 virtual child_iterator child_end(); 2088}; 2089 2090/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2091/// conversions, which have no direct representation in the original 2092/// source code. For example: converting T[]->T*, void f()->void 2093/// (*f)(), float->double, short->int, etc. 2094/// 2095/// In C, implicit casts always produce rvalues. However, in C++, an 2096/// implicit cast whose result is being bound to a reference will be 2097/// an lvalue or xvalue. For example: 2098/// 2099/// @code 2100/// class Base { }; 2101/// class Derived : public Base { }; 2102/// Derived &&ref(); 2103/// void f(Derived d) { 2104/// Base& b = d; // initializer is an ImplicitCastExpr 2105/// // to an lvalue of type Base 2106/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2107/// // to an xvalue of type Base 2108/// } 2109/// @endcode 2110class ImplicitCastExpr : public CastExpr { 2111private: 2112 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2113 unsigned BasePathLength, ExprValueKind VK) 2114 : CastExpr(ImplicitCastExprClass, ty, kind, op, BasePathLength) { 2115 setValueKind(VK); 2116 } 2117 2118 /// \brief Construct an empty implicit cast. 2119 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2120 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2121 2122public: 2123 enum OnStack_t { OnStack }; 2124 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2125 ExprValueKind VK) 2126 : CastExpr(ImplicitCastExprClass, ty, kind, op, 0) { 2127 setValueKind(VK); 2128 } 2129 2130 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2131 CastKind Kind, Expr *Operand, 2132 const CXXCastPath *BasePath, 2133 ExprValueKind Cat); 2134 2135 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2136 2137 virtual SourceRange getSourceRange() const { 2138 return getSubExpr()->getSourceRange(); 2139 } 2140 2141 using Expr::getValueKind; 2142 using Expr::setValueKind; 2143 2144 static bool classof(const Stmt *T) { 2145 return T->getStmtClass() == ImplicitCastExprClass; 2146 } 2147 static bool classof(const ImplicitCastExpr *) { return true; } 2148}; 2149 2150/// ExplicitCastExpr - An explicit cast written in the source 2151/// code. 2152/// 2153/// This class is effectively an abstract class, because it provides 2154/// the basic representation of an explicitly-written cast without 2155/// specifying which kind of cast (C cast, functional cast, static 2156/// cast, etc.) was written; specific derived classes represent the 2157/// particular style of cast and its location information. 2158/// 2159/// Unlike implicit casts, explicit cast nodes have two different 2160/// types: the type that was written into the source code, and the 2161/// actual type of the expression as determined by semantic 2162/// analysis. These types may differ slightly. For example, in C++ one 2163/// can cast to a reference type, which indicates that the resulting 2164/// expression will be an lvalue or xvalue. The reference type, however, 2165/// will not be used as the type of the expression. 2166class ExplicitCastExpr : public CastExpr { 2167 /// TInfo - Source type info for the (written) type 2168 /// this expression is casting to. 2169 TypeSourceInfo *TInfo; 2170 2171protected: 2172 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, 2173 Expr *op, unsigned PathSize, TypeSourceInfo *writtenTy) 2174 : CastExpr(SC, exprTy, kind, op, PathSize), TInfo(writtenTy) {} 2175 2176 /// \brief Construct an empty explicit cast. 2177 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2178 : CastExpr(SC, Shell, PathSize) { } 2179 2180public: 2181 /// getTypeInfoAsWritten - Returns the type source info for the type 2182 /// that this expression is casting to. 2183 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2184 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2185 2186 /// getTypeAsWritten - Returns the type that this expression is 2187 /// casting to, as written in the source code. 2188 QualType getTypeAsWritten() const { return TInfo->getType(); } 2189 2190 static bool classof(const Stmt *T) { 2191 return T->getStmtClass() >= firstExplicitCastExprConstant && 2192 T->getStmtClass() <= lastExplicitCastExprConstant; 2193 } 2194 static bool classof(const ExplicitCastExpr *) { return true; } 2195}; 2196 2197/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2198/// cast in C++ (C++ [expr.cast]), which uses the syntax 2199/// (Type)expr. For example: @c (int)f. 2200class CStyleCastExpr : public ExplicitCastExpr { 2201 SourceLocation LPLoc; // the location of the left paren 2202 SourceLocation RPLoc; // the location of the right paren 2203 2204 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, 2205 unsigned PathSize, TypeSourceInfo *writtenTy, 2206 SourceLocation l, SourceLocation r) 2207 : ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, PathSize, 2208 writtenTy), LPLoc(l), RPLoc(r) {} 2209 2210 /// \brief Construct an empty C-style explicit cast. 2211 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2212 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2213 2214public: 2215 static CStyleCastExpr *Create(ASTContext &Context, QualType T, CastKind K, 2216 Expr *Op, const CXXCastPath *BasePath, 2217 TypeSourceInfo *WrittenTy, SourceLocation L, 2218 SourceLocation R); 2219 2220 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2221 2222 SourceLocation getLParenLoc() const { return LPLoc; } 2223 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2224 2225 SourceLocation getRParenLoc() const { return RPLoc; } 2226 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2227 2228 virtual SourceRange getSourceRange() const { 2229 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2230 } 2231 static bool classof(const Stmt *T) { 2232 return T->getStmtClass() == CStyleCastExprClass; 2233 } 2234 static bool classof(const CStyleCastExpr *) { return true; } 2235}; 2236 2237/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2238/// 2239/// This expression node kind describes a builtin binary operation, 2240/// such as "x + y" for integer values "x" and "y". The operands will 2241/// already have been converted to appropriate types (e.g., by 2242/// performing promotions or conversions). 2243/// 2244/// In C++, where operators may be overloaded, a different kind of 2245/// expression node (CXXOperatorCallExpr) is used to express the 2246/// invocation of an overloaded operator with operator syntax. Within 2247/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2248/// used to store an expression "x + y" depends on the subexpressions 2249/// for x and y. If neither x or y is type-dependent, and the "+" 2250/// operator resolves to a built-in operation, BinaryOperator will be 2251/// used to express the computation (x and y may still be 2252/// value-dependent). If either x or y is type-dependent, or if the 2253/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2254/// be used to express the computation. 2255class BinaryOperator : public Expr { 2256public: 2257 typedef BinaryOperatorKind Opcode; 2258 2259private: 2260 unsigned Opc : 6; 2261 SourceLocation OpLoc; 2262 2263 enum { LHS, RHS, END_EXPR }; 2264 Stmt* SubExprs[END_EXPR]; 2265public: 2266 2267 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2268 SourceLocation opLoc) 2269 : Expr(BinaryOperatorClass, ResTy, 2270 lhs->isTypeDependent() || rhs->isTypeDependent(), 2271 lhs->isValueDependent() || rhs->isValueDependent()), 2272 Opc(opc), OpLoc(opLoc) { 2273 SubExprs[LHS] = lhs; 2274 SubExprs[RHS] = rhs; 2275 assert(!isCompoundAssignmentOp() && 2276 "Use ArithAssignBinaryOperator for compound assignments"); 2277 } 2278 2279 /// \brief Construct an empty binary operator. 2280 explicit BinaryOperator(EmptyShell Empty) 2281 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2282 2283 SourceLocation getOperatorLoc() const { return OpLoc; } 2284 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2285 2286 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2287 void setOpcode(Opcode O) { Opc = O; } 2288 2289 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2290 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2291 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2292 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2293 2294 virtual SourceRange getSourceRange() const { 2295 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2296 } 2297 2298 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2299 /// corresponds to, e.g. "<<=". 2300 static const char *getOpcodeStr(Opcode Op); 2301 2302 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2303 2304 /// \brief Retrieve the binary opcode that corresponds to the given 2305 /// overloaded operator. 2306 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2307 2308 /// \brief Retrieve the overloaded operator kind that corresponds to 2309 /// the given binary opcode. 2310 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2311 2312 /// predicates to categorize the respective opcodes. 2313 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2314 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2315 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2316 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2317 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2318 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2319 2320 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2321 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2322 2323 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2324 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2325 2326 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2327 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2328 2329 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2330 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2331 2332 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2333 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2334 2335 bool isAssignmentOp() const { return Opc >= BO_Assign && Opc <= BO_OrAssign; } 2336 bool isCompoundAssignmentOp() const { 2337 return Opc > BO_Assign && Opc <= BO_OrAssign; 2338 } 2339 bool isShiftAssignOp() const { 2340 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2341 } 2342 2343 static bool classof(const Stmt *S) { 2344 return S->getStmtClass() >= firstBinaryOperatorConstant && 2345 S->getStmtClass() <= lastBinaryOperatorConstant; 2346 } 2347 static bool classof(const BinaryOperator *) { return true; } 2348 2349 // Iterators 2350 virtual child_iterator child_begin(); 2351 virtual child_iterator child_end(); 2352 2353protected: 2354 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2355 SourceLocation opLoc, bool dead) 2356 : Expr(CompoundAssignOperatorClass, ResTy, 2357 lhs->isTypeDependent() || rhs->isTypeDependent(), 2358 lhs->isValueDependent() || rhs->isValueDependent()), 2359 Opc(opc), OpLoc(opLoc) { 2360 SubExprs[LHS] = lhs; 2361 SubExprs[RHS] = rhs; 2362 } 2363 2364 BinaryOperator(StmtClass SC, EmptyShell Empty) 2365 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2366}; 2367 2368/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2369/// track of the type the operation is performed in. Due to the semantics of 2370/// these operators, the operands are promoted, the aritmetic performed, an 2371/// implicit conversion back to the result type done, then the assignment takes 2372/// place. This captures the intermediate type which the computation is done 2373/// in. 2374class CompoundAssignOperator : public BinaryOperator { 2375 QualType ComputationLHSType; 2376 QualType ComputationResultType; 2377public: 2378 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 2379 QualType ResType, QualType CompLHSType, 2380 QualType CompResultType, 2381 SourceLocation OpLoc) 2382 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 2383 ComputationLHSType(CompLHSType), 2384 ComputationResultType(CompResultType) { 2385 assert(isCompoundAssignmentOp() && 2386 "Only should be used for compound assignments"); 2387 } 2388 2389 /// \brief Build an empty compound assignment operator expression. 2390 explicit CompoundAssignOperator(EmptyShell Empty) 2391 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2392 2393 // The two computation types are the type the LHS is converted 2394 // to for the computation and the type of the result; the two are 2395 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2396 QualType getComputationLHSType() const { return ComputationLHSType; } 2397 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2398 2399 QualType getComputationResultType() const { return ComputationResultType; } 2400 void setComputationResultType(QualType T) { ComputationResultType = T; } 2401 2402 static bool classof(const CompoundAssignOperator *) { return true; } 2403 static bool classof(const Stmt *S) { 2404 return S->getStmtClass() == CompoundAssignOperatorClass; 2405 } 2406}; 2407 2408/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 2409/// GNU "missing LHS" extension is in use. 2410/// 2411class ConditionalOperator : public Expr { 2412 enum { COND, LHS, RHS, END_EXPR }; 2413 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2414 Stmt* Save; 2415 SourceLocation QuestionLoc, ColonLoc; 2416public: 2417 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2418 SourceLocation CLoc, Expr *rhs, Expr *save, QualType t) 2419 : Expr(ConditionalOperatorClass, t, 2420 // FIXME: the type of the conditional operator doesn't 2421 // depend on the type of the conditional, but the standard 2422 // seems to imply that it could. File a bug! 2423 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 2424 (cond->isValueDependent() || 2425 (lhs && lhs->isValueDependent()) || 2426 (rhs && rhs->isValueDependent()))), 2427 QuestionLoc(QLoc), 2428 ColonLoc(CLoc) { 2429 SubExprs[COND] = cond; 2430 SubExprs[LHS] = lhs; 2431 SubExprs[RHS] = rhs; 2432 Save = save; 2433 } 2434 2435 /// \brief Build an empty conditional operator. 2436 explicit ConditionalOperator(EmptyShell Empty) 2437 : Expr(ConditionalOperatorClass, Empty) { } 2438 2439 // getCond - Return the expression representing the condition for 2440 // the ?: operator. 2441 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2442 void setCond(Expr *E) { SubExprs[COND] = E; } 2443 2444 // getTrueExpr - Return the subexpression representing the value of the ?: 2445 // expression if the condition evaluates to true. 2446 Expr *getTrueExpr() const { 2447 return cast<Expr>(SubExprs[LHS]); 2448 } 2449 2450 // getFalseExpr - Return the subexpression representing the value of the ?: 2451 // expression if the condition evaluates to false. This is the same as getRHS. 2452 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2453 2454 // getSaveExpr - In most cases this value will be null. Except a GCC extension 2455 // allows the left subexpression to be omitted, and instead of that condition 2456 // be returned. e.g: x ?: y is shorthand for x ? x : y, except that the 2457 // expression "x" is only evaluated once. Under this senario, this function 2458 // returns the original, non-converted condition expression for the ?:operator 2459 Expr *getSaveExpr() const { return Save? cast<Expr>(Save) : (Expr*)0; } 2460 2461 Expr *getLHS() const { return Save ? 0 : cast<Expr>(SubExprs[LHS]); } 2462 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2463 2464 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2465 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2466 2467 Expr *getSAVE() const { return Save? cast<Expr>(Save) : (Expr*)0; } 2468 void setSAVE(Expr *E) { Save = E; } 2469 2470 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2471 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 2472 2473 SourceLocation getColonLoc() const { return ColonLoc; } 2474 void setColonLoc(SourceLocation L) { ColonLoc = L; } 2475 2476 virtual SourceRange getSourceRange() const { 2477 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2478 } 2479 static bool classof(const Stmt *T) { 2480 return T->getStmtClass() == ConditionalOperatorClass; 2481 } 2482 static bool classof(const ConditionalOperator *) { return true; } 2483 2484 // Iterators 2485 virtual child_iterator child_begin(); 2486 virtual child_iterator child_end(); 2487}; 2488 2489/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2490class AddrLabelExpr : public Expr { 2491 SourceLocation AmpAmpLoc, LabelLoc; 2492 LabelStmt *Label; 2493public: 2494 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2495 QualType t) 2496 : Expr(AddrLabelExprClass, t, false, false), 2497 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2498 2499 /// \brief Build an empty address of a label expression. 2500 explicit AddrLabelExpr(EmptyShell Empty) 2501 : Expr(AddrLabelExprClass, Empty) { } 2502 2503 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2504 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2505 SourceLocation getLabelLoc() const { return LabelLoc; } 2506 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2507 2508 virtual SourceRange getSourceRange() const { 2509 return SourceRange(AmpAmpLoc, LabelLoc); 2510 } 2511 2512 LabelStmt *getLabel() const { return Label; } 2513 void setLabel(LabelStmt *S) { Label = S; } 2514 2515 static bool classof(const Stmt *T) { 2516 return T->getStmtClass() == AddrLabelExprClass; 2517 } 2518 static bool classof(const AddrLabelExpr *) { return true; } 2519 2520 // Iterators 2521 virtual child_iterator child_begin(); 2522 virtual child_iterator child_end(); 2523}; 2524 2525/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2526/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2527/// takes the value of the last subexpression. 2528class StmtExpr : public Expr { 2529 Stmt *SubStmt; 2530 SourceLocation LParenLoc, RParenLoc; 2531public: 2532 // FIXME: Does type-dependence need to be computed differently? 2533 StmtExpr(CompoundStmt *substmt, QualType T, 2534 SourceLocation lp, SourceLocation rp) : 2535 Expr(StmtExprClass, T, T->isDependentType(), false), 2536 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2537 2538 /// \brief Build an empty statement expression. 2539 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2540 2541 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2542 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2543 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2544 2545 virtual SourceRange getSourceRange() const { 2546 return SourceRange(LParenLoc, RParenLoc); 2547 } 2548 2549 SourceLocation getLParenLoc() const { return LParenLoc; } 2550 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2551 SourceLocation getRParenLoc() const { return RParenLoc; } 2552 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2553 2554 static bool classof(const Stmt *T) { 2555 return T->getStmtClass() == StmtExprClass; 2556 } 2557 static bool classof(const StmtExpr *) { return true; } 2558 2559 // Iterators 2560 virtual child_iterator child_begin(); 2561 virtual child_iterator child_end(); 2562}; 2563 2564/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 2565/// This AST node represents a function that returns 1 if two *types* (not 2566/// expressions) are compatible. The result of this built-in function can be 2567/// used in integer constant expressions. 2568class TypesCompatibleExpr : public Expr { 2569 TypeSourceInfo *TInfo1; 2570 TypeSourceInfo *TInfo2; 2571 SourceLocation BuiltinLoc, RParenLoc; 2572public: 2573 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 2574 TypeSourceInfo *tinfo1, TypeSourceInfo *tinfo2, 2575 SourceLocation RP) : 2576 Expr(TypesCompatibleExprClass, ReturnType, false, false), 2577 TInfo1(tinfo1), TInfo2(tinfo2), BuiltinLoc(BLoc), RParenLoc(RP) {} 2578 2579 /// \brief Build an empty __builtin_type_compatible_p expression. 2580 explicit TypesCompatibleExpr(EmptyShell Empty) 2581 : Expr(TypesCompatibleExprClass, Empty) { } 2582 2583 TypeSourceInfo *getArgTInfo1() const { return TInfo1; } 2584 void setArgTInfo1(TypeSourceInfo *TInfo) { TInfo1 = TInfo; } 2585 TypeSourceInfo *getArgTInfo2() const { return TInfo2; } 2586 void setArgTInfo2(TypeSourceInfo *TInfo) { TInfo2 = TInfo; } 2587 2588 QualType getArgType1() const { return TInfo1->getType(); } 2589 QualType getArgType2() const { return TInfo2->getType(); } 2590 2591 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2592 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2593 2594 SourceLocation getRParenLoc() const { return RParenLoc; } 2595 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2596 2597 virtual SourceRange getSourceRange() const { 2598 return SourceRange(BuiltinLoc, RParenLoc); 2599 } 2600 static bool classof(const Stmt *T) { 2601 return T->getStmtClass() == TypesCompatibleExprClass; 2602 } 2603 static bool classof(const TypesCompatibleExpr *) { return true; } 2604 2605 // Iterators 2606 virtual child_iterator child_begin(); 2607 virtual child_iterator child_end(); 2608}; 2609 2610/// ShuffleVectorExpr - clang-specific builtin-in function 2611/// __builtin_shufflevector. 2612/// This AST node represents a operator that does a constant 2613/// shuffle, similar to LLVM's shufflevector instruction. It takes 2614/// two vectors and a variable number of constant indices, 2615/// and returns the appropriately shuffled vector. 2616class ShuffleVectorExpr : public Expr { 2617 SourceLocation BuiltinLoc, RParenLoc; 2618 2619 // SubExprs - the list of values passed to the __builtin_shufflevector 2620 // function. The first two are vectors, and the rest are constant 2621 // indices. The number of values in this list is always 2622 // 2+the number of indices in the vector type. 2623 Stmt **SubExprs; 2624 unsigned NumExprs; 2625 2626public: 2627 // FIXME: Can a shufflevector be value-dependent? Does type-dependence need 2628 // to be computed differently? 2629 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2630 QualType Type, SourceLocation BLoc, 2631 SourceLocation RP) : 2632 Expr(ShuffleVectorExprClass, Type, Type->isDependentType(), false), 2633 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) { 2634 2635 SubExprs = new (C) Stmt*[nexpr]; 2636 for (unsigned i = 0; i < nexpr; i++) 2637 SubExprs[i] = args[i]; 2638 } 2639 2640 /// \brief Build an empty vector-shuffle expression. 2641 explicit ShuffleVectorExpr(EmptyShell Empty) 2642 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2643 2644 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2645 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2646 2647 SourceLocation getRParenLoc() const { return RParenLoc; } 2648 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2649 2650 virtual SourceRange getSourceRange() const { 2651 return SourceRange(BuiltinLoc, RParenLoc); 2652 } 2653 static bool classof(const Stmt *T) { 2654 return T->getStmtClass() == ShuffleVectorExprClass; 2655 } 2656 static bool classof(const ShuffleVectorExpr *) { return true; } 2657 2658 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2659 /// constant expression, the actual arguments passed in, and the function 2660 /// pointers. 2661 unsigned getNumSubExprs() const { return NumExprs; } 2662 2663 /// getExpr - Return the Expr at the specified index. 2664 Expr *getExpr(unsigned Index) { 2665 assert((Index < NumExprs) && "Arg access out of range!"); 2666 return cast<Expr>(SubExprs[Index]); 2667 } 2668 const Expr *getExpr(unsigned Index) const { 2669 assert((Index < NumExprs) && "Arg access out of range!"); 2670 return cast<Expr>(SubExprs[Index]); 2671 } 2672 2673 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2674 2675 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2676 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2677 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2678 } 2679 2680 // Iterators 2681 virtual child_iterator child_begin(); 2682 virtual child_iterator child_end(); 2683}; 2684 2685/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2686/// This AST node is similar to the conditional operator (?:) in C, with 2687/// the following exceptions: 2688/// - the test expression must be a integer constant expression. 2689/// - the expression returned acts like the chosen subexpression in every 2690/// visible way: the type is the same as that of the chosen subexpression, 2691/// and all predicates (whether it's an l-value, whether it's an integer 2692/// constant expression, etc.) return the same result as for the chosen 2693/// sub-expression. 2694class ChooseExpr : public Expr { 2695 enum { COND, LHS, RHS, END_EXPR }; 2696 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2697 SourceLocation BuiltinLoc, RParenLoc; 2698public: 2699 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 2700 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2701 : Expr(ChooseExprClass, t, TypeDependent, ValueDependent), 2702 BuiltinLoc(BLoc), RParenLoc(RP) { 2703 SubExprs[COND] = cond; 2704 SubExprs[LHS] = lhs; 2705 SubExprs[RHS] = rhs; 2706 } 2707 2708 /// \brief Build an empty __builtin_choose_expr. 2709 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2710 2711 /// isConditionTrue - Return whether the condition is true (i.e. not 2712 /// equal to zero). 2713 bool isConditionTrue(ASTContext &C) const; 2714 2715 /// getChosenSubExpr - Return the subexpression chosen according to the 2716 /// condition. 2717 Expr *getChosenSubExpr(ASTContext &C) const { 2718 return isConditionTrue(C) ? getLHS() : getRHS(); 2719 } 2720 2721 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2722 void setCond(Expr *E) { SubExprs[COND] = E; } 2723 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2724 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2725 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2726 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2727 2728 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2729 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2730 2731 SourceLocation getRParenLoc() const { return RParenLoc; } 2732 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2733 2734 virtual SourceRange getSourceRange() const { 2735 return SourceRange(BuiltinLoc, RParenLoc); 2736 } 2737 static bool classof(const Stmt *T) { 2738 return T->getStmtClass() == ChooseExprClass; 2739 } 2740 static bool classof(const ChooseExpr *) { return true; } 2741 2742 // Iterators 2743 virtual child_iterator child_begin(); 2744 virtual child_iterator child_end(); 2745}; 2746 2747/// GNUNullExpr - Implements the GNU __null extension, which is a name 2748/// for a null pointer constant that has integral type (e.g., int or 2749/// long) and is the same size and alignment as a pointer. The __null 2750/// extension is typically only used by system headers, which define 2751/// NULL as __null in C++ rather than using 0 (which is an integer 2752/// that may not match the size of a pointer). 2753class GNUNullExpr : public Expr { 2754 /// TokenLoc - The location of the __null keyword. 2755 SourceLocation TokenLoc; 2756 2757public: 2758 GNUNullExpr(QualType Ty, SourceLocation Loc) 2759 : Expr(GNUNullExprClass, Ty, false, false), TokenLoc(Loc) { } 2760 2761 /// \brief Build an empty GNU __null expression. 2762 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2763 2764 /// getTokenLocation - The location of the __null token. 2765 SourceLocation getTokenLocation() const { return TokenLoc; } 2766 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2767 2768 virtual SourceRange getSourceRange() const { 2769 return SourceRange(TokenLoc); 2770 } 2771 static bool classof(const Stmt *T) { 2772 return T->getStmtClass() == GNUNullExprClass; 2773 } 2774 static bool classof(const GNUNullExpr *) { return true; } 2775 2776 // Iterators 2777 virtual child_iterator child_begin(); 2778 virtual child_iterator child_end(); 2779}; 2780 2781/// VAArgExpr, used for the builtin function __builtin_va_arg. 2782class VAArgExpr : public Expr { 2783 Stmt *Val; 2784 TypeSourceInfo *TInfo; 2785 SourceLocation BuiltinLoc, RParenLoc; 2786public: 2787 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 2788 SourceLocation RPLoc, QualType t) 2789 : Expr(VAArgExprClass, t, t->isDependentType(), false), 2790 Val(e), TInfo(TInfo), 2791 BuiltinLoc(BLoc), 2792 RParenLoc(RPLoc) { } 2793 2794 /// \brief Create an empty __builtin_va_arg expression. 2795 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2796 2797 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2798 Expr *getSubExpr() { return cast<Expr>(Val); } 2799 void setSubExpr(Expr *E) { Val = E; } 2800 2801 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 2802 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 2803 2804 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2805 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2806 2807 SourceLocation getRParenLoc() const { return RParenLoc; } 2808 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2809 2810 virtual SourceRange getSourceRange() const { 2811 return SourceRange(BuiltinLoc, RParenLoc); 2812 } 2813 static bool classof(const Stmt *T) { 2814 return T->getStmtClass() == VAArgExprClass; 2815 } 2816 static bool classof(const VAArgExpr *) { return true; } 2817 2818 // Iterators 2819 virtual child_iterator child_begin(); 2820 virtual child_iterator child_end(); 2821}; 2822 2823/// @brief Describes an C or C++ initializer list. 2824/// 2825/// InitListExpr describes an initializer list, which can be used to 2826/// initialize objects of different types, including 2827/// struct/class/union types, arrays, and vectors. For example: 2828/// 2829/// @code 2830/// struct foo x = { 1, { 2, 3 } }; 2831/// @endcode 2832/// 2833/// Prior to semantic analysis, an initializer list will represent the 2834/// initializer list as written by the user, but will have the 2835/// placeholder type "void". This initializer list is called the 2836/// syntactic form of the initializer, and may contain C99 designated 2837/// initializers (represented as DesignatedInitExprs), initializations 2838/// of subobject members without explicit braces, and so on. Clients 2839/// interested in the original syntax of the initializer list should 2840/// use the syntactic form of the initializer list. 2841/// 2842/// After semantic analysis, the initializer list will represent the 2843/// semantic form of the initializer, where the initializations of all 2844/// subobjects are made explicit with nested InitListExpr nodes and 2845/// C99 designators have been eliminated by placing the designated 2846/// initializations into the subobject they initialize. Additionally, 2847/// any "holes" in the initialization, where no initializer has been 2848/// specified for a particular subobject, will be replaced with 2849/// implicitly-generated ImplicitValueInitExpr expressions that 2850/// value-initialize the subobjects. Note, however, that the 2851/// initializer lists may still have fewer initializers than there are 2852/// elements to initialize within the object. 2853/// 2854/// Given the semantic form of the initializer list, one can retrieve 2855/// the original syntactic form of that initializer list (if it 2856/// exists) using getSyntacticForm(). Since many initializer lists 2857/// have the same syntactic and semantic forms, getSyntacticForm() may 2858/// return NULL, indicating that the current initializer list also 2859/// serves as its syntactic form. 2860class InitListExpr : public Expr { 2861 // FIXME: Eliminate this vector in favor of ASTContext allocation 2862 typedef ASTVector<Stmt *> InitExprsTy; 2863 InitExprsTy InitExprs; 2864 SourceLocation LBraceLoc, RBraceLoc; 2865 2866 /// Contains the initializer list that describes the syntactic form 2867 /// written in the source code. 2868 InitListExpr *SyntacticForm; 2869 2870 /// If this initializer list initializes a union, specifies which 2871 /// field within the union will be initialized. 2872 FieldDecl *UnionFieldInit; 2873 2874 /// Whether this initializer list originally had a GNU array-range 2875 /// designator in it. This is a temporary marker used by CodeGen. 2876 bool HadArrayRangeDesignator; 2877 2878public: 2879 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 2880 Expr **initexprs, unsigned numinits, 2881 SourceLocation rbraceloc); 2882 2883 /// \brief Build an empty initializer list. 2884 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 2885 : Expr(InitListExprClass, Empty), InitExprs(C) { } 2886 2887 unsigned getNumInits() const { return InitExprs.size(); } 2888 2889 const Expr *getInit(unsigned Init) const { 2890 assert(Init < getNumInits() && "Initializer access out of range!"); 2891 return cast_or_null<Expr>(InitExprs[Init]); 2892 } 2893 2894 Expr *getInit(unsigned Init) { 2895 assert(Init < getNumInits() && "Initializer access out of range!"); 2896 return cast_or_null<Expr>(InitExprs[Init]); 2897 } 2898 2899 void setInit(unsigned Init, Expr *expr) { 2900 assert(Init < getNumInits() && "Initializer access out of range!"); 2901 InitExprs[Init] = expr; 2902 } 2903 2904 /// \brief Reserve space for some number of initializers. 2905 void reserveInits(ASTContext &C, unsigned NumInits); 2906 2907 /// @brief Specify the number of initializers 2908 /// 2909 /// If there are more than @p NumInits initializers, the remaining 2910 /// initializers will be destroyed. If there are fewer than @p 2911 /// NumInits initializers, NULL expressions will be added for the 2912 /// unknown initializers. 2913 void resizeInits(ASTContext &Context, unsigned NumInits); 2914 2915 /// @brief Updates the initializer at index @p Init with the new 2916 /// expression @p expr, and returns the old expression at that 2917 /// location. 2918 /// 2919 /// When @p Init is out of range for this initializer list, the 2920 /// initializer list will be extended with NULL expressions to 2921 /// accomodate the new entry. 2922 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 2923 2924 /// \brief If this initializes a union, specifies which field in the 2925 /// union to initialize. 2926 /// 2927 /// Typically, this field is the first named field within the 2928 /// union. However, a designated initializer can specify the 2929 /// initialization of a different field within the union. 2930 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2931 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2932 2933 // Explicit InitListExpr's originate from source code (and have valid source 2934 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2935 bool isExplicit() { 2936 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2937 } 2938 2939 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2940 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2941 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2942 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2943 2944 /// @brief Retrieve the initializer list that describes the 2945 /// syntactic form of the initializer. 2946 /// 2947 /// 2948 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2949 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2950 2951 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2952 void sawArrayRangeDesignator(bool ARD = true) { 2953 HadArrayRangeDesignator = ARD; 2954 } 2955 2956 virtual SourceRange getSourceRange() const; 2957 2958 static bool classof(const Stmt *T) { 2959 return T->getStmtClass() == InitListExprClass; 2960 } 2961 static bool classof(const InitListExpr *) { return true; } 2962 2963 // Iterators 2964 virtual child_iterator child_begin(); 2965 virtual child_iterator child_end(); 2966 2967 typedef InitExprsTy::iterator iterator; 2968 typedef InitExprsTy::const_iterator const_iterator; 2969 typedef InitExprsTy::reverse_iterator reverse_iterator; 2970 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 2971 2972 iterator begin() { return InitExprs.begin(); } 2973 const_iterator begin() const { return InitExprs.begin(); } 2974 iterator end() { return InitExprs.end(); } 2975 const_iterator end() const { return InitExprs.end(); } 2976 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2977 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 2978 reverse_iterator rend() { return InitExprs.rend(); } 2979 const_reverse_iterator rend() const { return InitExprs.rend(); } 2980}; 2981 2982/// @brief Represents a C99 designated initializer expression. 2983/// 2984/// A designated initializer expression (C99 6.7.8) contains one or 2985/// more designators (which can be field designators, array 2986/// designators, or GNU array-range designators) followed by an 2987/// expression that initializes the field or element(s) that the 2988/// designators refer to. For example, given: 2989/// 2990/// @code 2991/// struct point { 2992/// double x; 2993/// double y; 2994/// }; 2995/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2996/// @endcode 2997/// 2998/// The InitListExpr contains three DesignatedInitExprs, the first of 2999/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3000/// designators, one array designator for @c [2] followed by one field 3001/// designator for @c .y. The initalization expression will be 1.0. 3002class DesignatedInitExpr : public Expr { 3003public: 3004 /// \brief Forward declaration of the Designator class. 3005 class Designator; 3006 3007private: 3008 /// The location of the '=' or ':' prior to the actual initializer 3009 /// expression. 3010 SourceLocation EqualOrColonLoc; 3011 3012 /// Whether this designated initializer used the GNU deprecated 3013 /// syntax rather than the C99 '=' syntax. 3014 bool GNUSyntax : 1; 3015 3016 /// The number of designators in this initializer expression. 3017 unsigned NumDesignators : 15; 3018 3019 /// \brief The designators in this designated initialization 3020 /// expression. 3021 Designator *Designators; 3022 3023 /// The number of subexpressions of this initializer expression, 3024 /// which contains both the initializer and any additional 3025 /// expressions used by array and array-range designators. 3026 unsigned NumSubExprs : 16; 3027 3028 3029 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3030 const Designator *Designators, 3031 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3032 Expr **IndexExprs, unsigned NumIndexExprs, 3033 Expr *Init); 3034 3035 explicit DesignatedInitExpr(unsigned NumSubExprs) 3036 : Expr(DesignatedInitExprClass, EmptyShell()), 3037 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3038 3039public: 3040 /// A field designator, e.g., ".x". 3041 struct FieldDesignator { 3042 /// Refers to the field that is being initialized. The low bit 3043 /// of this field determines whether this is actually a pointer 3044 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3045 /// initially constructed, a field designator will store an 3046 /// IdentifierInfo*. After semantic analysis has resolved that 3047 /// name, the field designator will instead store a FieldDecl*. 3048 uintptr_t NameOrField; 3049 3050 /// The location of the '.' in the designated initializer. 3051 unsigned DotLoc; 3052 3053 /// The location of the field name in the designated initializer. 3054 unsigned FieldLoc; 3055 }; 3056 3057 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3058 struct ArrayOrRangeDesignator { 3059 /// Location of the first index expression within the designated 3060 /// initializer expression's list of subexpressions. 3061 unsigned Index; 3062 /// The location of the '[' starting the array range designator. 3063 unsigned LBracketLoc; 3064 /// The location of the ellipsis separating the start and end 3065 /// indices. Only valid for GNU array-range designators. 3066 unsigned EllipsisLoc; 3067 /// The location of the ']' terminating the array range designator. 3068 unsigned RBracketLoc; 3069 }; 3070 3071 /// @brief Represents a single C99 designator. 3072 /// 3073 /// @todo This class is infuriatingly similar to clang::Designator, 3074 /// but minor differences (storing indices vs. storing pointers) 3075 /// keep us from reusing it. Try harder, later, to rectify these 3076 /// differences. 3077 class Designator { 3078 /// @brief The kind of designator this describes. 3079 enum { 3080 FieldDesignator, 3081 ArrayDesignator, 3082 ArrayRangeDesignator 3083 } Kind; 3084 3085 union { 3086 /// A field designator, e.g., ".x". 3087 struct FieldDesignator Field; 3088 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3089 struct ArrayOrRangeDesignator ArrayOrRange; 3090 }; 3091 friend class DesignatedInitExpr; 3092 3093 public: 3094 Designator() {} 3095 3096 /// @brief Initializes a field designator. 3097 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3098 SourceLocation FieldLoc) 3099 : Kind(FieldDesignator) { 3100 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3101 Field.DotLoc = DotLoc.getRawEncoding(); 3102 Field.FieldLoc = FieldLoc.getRawEncoding(); 3103 } 3104 3105 /// @brief Initializes an array designator. 3106 Designator(unsigned Index, SourceLocation LBracketLoc, 3107 SourceLocation RBracketLoc) 3108 : Kind(ArrayDesignator) { 3109 ArrayOrRange.Index = Index; 3110 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3111 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3112 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3113 } 3114 3115 /// @brief Initializes a GNU array-range designator. 3116 Designator(unsigned Index, SourceLocation LBracketLoc, 3117 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3118 : Kind(ArrayRangeDesignator) { 3119 ArrayOrRange.Index = Index; 3120 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3121 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3122 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3123 } 3124 3125 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3126 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3127 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3128 3129 IdentifierInfo * getFieldName(); 3130 3131 FieldDecl *getField() { 3132 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3133 if (Field.NameOrField & 0x01) 3134 return 0; 3135 else 3136 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3137 } 3138 3139 void setField(FieldDecl *FD) { 3140 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3141 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3142 } 3143 3144 SourceLocation getDotLoc() const { 3145 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3146 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3147 } 3148 3149 SourceLocation getFieldLoc() const { 3150 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3151 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3152 } 3153 3154 SourceLocation getLBracketLoc() const { 3155 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3156 "Only valid on an array or array-range designator"); 3157 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3158 } 3159 3160 SourceLocation getRBracketLoc() const { 3161 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3162 "Only valid on an array or array-range designator"); 3163 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3164 } 3165 3166 SourceLocation getEllipsisLoc() const { 3167 assert(Kind == ArrayRangeDesignator && 3168 "Only valid on an array-range designator"); 3169 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3170 } 3171 3172 unsigned getFirstExprIndex() const { 3173 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3174 "Only valid on an array or array-range designator"); 3175 return ArrayOrRange.Index; 3176 } 3177 3178 SourceLocation getStartLocation() const { 3179 if (Kind == FieldDesignator) 3180 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3181 else 3182 return getLBracketLoc(); 3183 } 3184 }; 3185 3186 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3187 unsigned NumDesignators, 3188 Expr **IndexExprs, unsigned NumIndexExprs, 3189 SourceLocation EqualOrColonLoc, 3190 bool GNUSyntax, Expr *Init); 3191 3192 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3193 3194 /// @brief Returns the number of designators in this initializer. 3195 unsigned size() const { return NumDesignators; } 3196 3197 // Iterator access to the designators. 3198 typedef Designator* designators_iterator; 3199 designators_iterator designators_begin() { return Designators; } 3200 designators_iterator designators_end() { 3201 return Designators + NumDesignators; 3202 } 3203 3204 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3205 3206 void setDesignators(ASTContext &C, const Designator *Desigs, 3207 unsigned NumDesigs); 3208 3209 Expr *getArrayIndex(const Designator& D); 3210 Expr *getArrayRangeStart(const Designator& D); 3211 Expr *getArrayRangeEnd(const Designator& D); 3212 3213 /// @brief Retrieve the location of the '=' that precedes the 3214 /// initializer value itself, if present. 3215 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3216 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3217 3218 /// @brief Determines whether this designated initializer used the 3219 /// deprecated GNU syntax for designated initializers. 3220 bool usesGNUSyntax() const { return GNUSyntax; } 3221 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3222 3223 /// @brief Retrieve the initializer value. 3224 Expr *getInit() const { 3225 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3226 } 3227 3228 void setInit(Expr *init) { 3229 *child_begin() = init; 3230 } 3231 3232 /// \brief Retrieve the total number of subexpressions in this 3233 /// designated initializer expression, including the actual 3234 /// initialized value and any expressions that occur within array 3235 /// and array-range designators. 3236 unsigned getNumSubExprs() const { return NumSubExprs; } 3237 3238 Expr *getSubExpr(unsigned Idx) { 3239 assert(Idx < NumSubExprs && "Subscript out of range"); 3240 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3241 Ptr += sizeof(DesignatedInitExpr); 3242 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3243 } 3244 3245 void setSubExpr(unsigned Idx, Expr *E) { 3246 assert(Idx < NumSubExprs && "Subscript out of range"); 3247 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3248 Ptr += sizeof(DesignatedInitExpr); 3249 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3250 } 3251 3252 /// \brief Replaces the designator at index @p Idx with the series 3253 /// of designators in [First, Last). 3254 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3255 const Designator *Last); 3256 3257 virtual SourceRange getSourceRange() const; 3258 3259 static bool classof(const Stmt *T) { 3260 return T->getStmtClass() == DesignatedInitExprClass; 3261 } 3262 static bool classof(const DesignatedInitExpr *) { return true; } 3263 3264 // Iterators 3265 virtual child_iterator child_begin(); 3266 virtual child_iterator child_end(); 3267}; 3268 3269/// \brief Represents an implicitly-generated value initialization of 3270/// an object of a given type. 3271/// 3272/// Implicit value initializations occur within semantic initializer 3273/// list expressions (InitListExpr) as placeholders for subobject 3274/// initializations not explicitly specified by the user. 3275/// 3276/// \see InitListExpr 3277class ImplicitValueInitExpr : public Expr { 3278public: 3279 explicit ImplicitValueInitExpr(QualType ty) 3280 : Expr(ImplicitValueInitExprClass, ty, false, false) { } 3281 3282 /// \brief Construct an empty implicit value initialization. 3283 explicit ImplicitValueInitExpr(EmptyShell Empty) 3284 : Expr(ImplicitValueInitExprClass, Empty) { } 3285 3286 static bool classof(const Stmt *T) { 3287 return T->getStmtClass() == ImplicitValueInitExprClass; 3288 } 3289 static bool classof(const ImplicitValueInitExpr *) { return true; } 3290 3291 virtual SourceRange getSourceRange() const { 3292 return SourceRange(); 3293 } 3294 3295 // Iterators 3296 virtual child_iterator child_begin(); 3297 virtual child_iterator child_end(); 3298}; 3299 3300 3301class ParenListExpr : public Expr { 3302 Stmt **Exprs; 3303 unsigned NumExprs; 3304 SourceLocation LParenLoc, RParenLoc; 3305 3306public: 3307 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3308 unsigned numexprs, SourceLocation rparenloc); 3309 3310 /// \brief Build an empty paren list. 3311 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3312 3313 unsigned getNumExprs() const { return NumExprs; } 3314 3315 const Expr* getExpr(unsigned Init) const { 3316 assert(Init < getNumExprs() && "Initializer access out of range!"); 3317 return cast_or_null<Expr>(Exprs[Init]); 3318 } 3319 3320 Expr* getExpr(unsigned Init) { 3321 assert(Init < getNumExprs() && "Initializer access out of range!"); 3322 return cast_or_null<Expr>(Exprs[Init]); 3323 } 3324 3325 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3326 3327 SourceLocation getLParenLoc() const { return LParenLoc; } 3328 SourceLocation getRParenLoc() const { return RParenLoc; } 3329 3330 virtual SourceRange getSourceRange() const { 3331 return SourceRange(LParenLoc, RParenLoc); 3332 } 3333 static bool classof(const Stmt *T) { 3334 return T->getStmtClass() == ParenListExprClass; 3335 } 3336 static bool classof(const ParenListExpr *) { return true; } 3337 3338 // Iterators 3339 virtual child_iterator child_begin(); 3340 virtual child_iterator child_end(); 3341 3342 friend class ASTStmtReader; 3343 friend class ASTStmtWriter; 3344}; 3345 3346 3347//===----------------------------------------------------------------------===// 3348// Clang Extensions 3349//===----------------------------------------------------------------------===// 3350 3351 3352/// ExtVectorElementExpr - This represents access to specific elements of a 3353/// vector, and may occur on the left hand side or right hand side. For example 3354/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3355/// 3356/// Note that the base may have either vector or pointer to vector type, just 3357/// like a struct field reference. 3358/// 3359class ExtVectorElementExpr : public Expr { 3360 Stmt *Base; 3361 IdentifierInfo *Accessor; 3362 SourceLocation AccessorLoc; 3363public: 3364 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 3365 SourceLocation loc) 3366 : Expr(ExtVectorElementExprClass, ty, base->isTypeDependent(), 3367 base->isValueDependent()), 3368 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3369 3370 /// \brief Build an empty vector element expression. 3371 explicit ExtVectorElementExpr(EmptyShell Empty) 3372 : Expr(ExtVectorElementExprClass, Empty) { } 3373 3374 const Expr *getBase() const { return cast<Expr>(Base); } 3375 Expr *getBase() { return cast<Expr>(Base); } 3376 void setBase(Expr *E) { Base = E; } 3377 3378 IdentifierInfo &getAccessor() const { return *Accessor; } 3379 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3380 3381 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3382 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3383 3384 /// getNumElements - Get the number of components being selected. 3385 unsigned getNumElements() const; 3386 3387 /// containsDuplicateElements - Return true if any element access is 3388 /// repeated. 3389 bool containsDuplicateElements() const; 3390 3391 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3392 /// aggregate Constant of ConstantInt(s). 3393 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3394 3395 virtual SourceRange getSourceRange() const { 3396 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3397 } 3398 3399 /// isArrow - Return true if the base expression is a pointer to vector, 3400 /// return false if the base expression is a vector. 3401 bool isArrow() const; 3402 3403 static bool classof(const Stmt *T) { 3404 return T->getStmtClass() == ExtVectorElementExprClass; 3405 } 3406 static bool classof(const ExtVectorElementExpr *) { return true; } 3407 3408 // Iterators 3409 virtual child_iterator child_begin(); 3410 virtual child_iterator child_end(); 3411}; 3412 3413 3414/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3415/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3416class BlockExpr : public Expr { 3417protected: 3418 BlockDecl *TheBlock; 3419 bool HasBlockDeclRefExprs; 3420public: 3421 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 3422 : Expr(BlockExprClass, ty, ty->isDependentType(), false), 3423 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 3424 3425 /// \brief Build an empty block expression. 3426 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3427 3428 const BlockDecl *getBlockDecl() const { return TheBlock; } 3429 BlockDecl *getBlockDecl() { return TheBlock; } 3430 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3431 3432 // Convenience functions for probing the underlying BlockDecl. 3433 SourceLocation getCaretLocation() const; 3434 const Stmt *getBody() const; 3435 Stmt *getBody(); 3436 3437 virtual SourceRange getSourceRange() const { 3438 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3439 } 3440 3441 /// getFunctionType - Return the underlying function type for this block. 3442 const FunctionType *getFunctionType() const; 3443 3444 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 3445 /// inside of the block that reference values outside the block. 3446 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 3447 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 3448 3449 static bool classof(const Stmt *T) { 3450 return T->getStmtClass() == BlockExprClass; 3451 } 3452 static bool classof(const BlockExpr *) { return true; } 3453 3454 // Iterators 3455 virtual child_iterator child_begin(); 3456 virtual child_iterator child_end(); 3457}; 3458 3459/// BlockDeclRefExpr - A reference to a declared variable, function, 3460/// enum, etc. 3461class BlockDeclRefExpr : public Expr { 3462 ValueDecl *D; 3463 SourceLocation Loc; 3464 bool IsByRef : 1; 3465 bool ConstQualAdded : 1; 3466 Stmt *CopyConstructorVal; 3467public: 3468 // FIXME: Fix type/value dependence! 3469 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 3470 bool constAdded = false, 3471 Stmt *copyConstructorVal = 0) 3472 : Expr(BlockDeclRefExprClass, t, (!t.isNull() && t->isDependentType()),false), 3473 D(d), Loc(l), IsByRef(ByRef), 3474 ConstQualAdded(constAdded), CopyConstructorVal(copyConstructorVal) {} 3475 3476 // \brief Build an empty reference to a declared variable in a 3477 // block. 3478 explicit BlockDeclRefExpr(EmptyShell Empty) 3479 : Expr(BlockDeclRefExprClass, Empty) { } 3480 3481 ValueDecl *getDecl() { return D; } 3482 const ValueDecl *getDecl() const { return D; } 3483 void setDecl(ValueDecl *VD) { D = VD; } 3484 3485 SourceLocation getLocation() const { return Loc; } 3486 void setLocation(SourceLocation L) { Loc = L; } 3487 3488 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 3489 3490 bool isByRef() const { return IsByRef; } 3491 void setByRef(bool BR) { IsByRef = BR; } 3492 3493 bool isConstQualAdded() const { return ConstQualAdded; } 3494 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3495 3496 const Expr *getCopyConstructorExpr() const 3497 { return cast_or_null<Expr>(CopyConstructorVal); } 3498 Expr *getCopyConstructorExpr() 3499 { return cast_or_null<Expr>(CopyConstructorVal); } 3500 void setCopyConstructorExpr(Expr *E) { CopyConstructorVal = E; } 3501 3502 static bool classof(const Stmt *T) { 3503 return T->getStmtClass() == BlockDeclRefExprClass; 3504 } 3505 static bool classof(const BlockDeclRefExpr *) { return true; } 3506 3507 // Iterators 3508 virtual child_iterator child_begin(); 3509 virtual child_iterator child_end(); 3510}; 3511 3512/// OpaqueValueExpr - An expression referring to an opaque object of a 3513/// fixed type and value class. These don't correspond to concrete 3514/// syntax; instead they're used to express operations (usually copy 3515/// operations) on values whose source is generally obvious from 3516/// context. 3517class OpaqueValueExpr : public Expr { 3518 friend class ASTStmtReader; 3519public: 3520 OpaqueValueExpr(QualType T, ExprValueKind VK) 3521 : Expr(OpaqueValueExprClass, T, T->isDependentType(), 3522 T->isDependentType()) { 3523 setValueKind(VK); 3524 } 3525 3526 explicit OpaqueValueExpr(EmptyShell Empty) 3527 : Expr(OpaqueValueExprClass, Empty) { } 3528 3529 using Expr::getValueKind; 3530 3531 virtual SourceRange getSourceRange() const; 3532 virtual child_iterator child_begin(); 3533 virtual child_iterator child_end(); 3534 3535 static bool classof(const Stmt *T) { 3536 return T->getStmtClass() == OpaqueValueExprClass; 3537 } 3538 static bool classof(const OpaqueValueExpr *) { return true; } 3539}; 3540 3541} // end namespace clang 3542 3543#endif 3544