Expr.h revision cdba6595a61a7bd31f504260abf63c900a759d0f
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 /// getLocationOfByte - Return a source location that points to the specified 1039 /// byte of this string literal. 1040 /// 1041 /// Strings are amazingly complex. They can be formed from multiple tokens 1042 /// and can have escape sequences in them in addition to the usual trigraph 1043 /// and escaped newline business. This routine handles this complexity. 1044 /// 1045 SourceLocation getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 1046 const LangOptions &Features, 1047 const TargetInfo &Target) const; 1048 1049 typedef const SourceLocation *tokloc_iterator; 1050 tokloc_iterator tokloc_begin() const { return TokLocs; } 1051 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 1052 1053 virtual SourceRange getSourceRange() const { 1054 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 1055 } 1056 static bool classof(const Stmt *T) { 1057 return T->getStmtClass() == StringLiteralClass; 1058 } 1059 static bool classof(const StringLiteral *) { return true; } 1060 1061 // Iterators 1062 virtual child_iterator child_begin(); 1063 virtual child_iterator child_end(); 1064}; 1065 1066/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 1067/// AST node is only formed if full location information is requested. 1068class ParenExpr : public Expr { 1069 SourceLocation L, R; 1070 Stmt *Val; 1071public: 1072 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 1073 : Expr(ParenExprClass, val->getType(), 1074 val->isTypeDependent(), val->isValueDependent()), 1075 L(l), R(r), Val(val) {} 1076 1077 /// \brief Construct an empty parenthesized expression. 1078 explicit ParenExpr(EmptyShell Empty) 1079 : Expr(ParenExprClass, Empty) { } 1080 1081 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1082 Expr *getSubExpr() { return cast<Expr>(Val); } 1083 void setSubExpr(Expr *E) { Val = E; } 1084 1085 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 1086 1087 /// \brief Get the location of the left parentheses '('. 1088 SourceLocation getLParen() const { return L; } 1089 void setLParen(SourceLocation Loc) { L = Loc; } 1090 1091 /// \brief Get the location of the right parentheses ')'. 1092 SourceLocation getRParen() const { return R; } 1093 void setRParen(SourceLocation Loc) { R = Loc; } 1094 1095 static bool classof(const Stmt *T) { 1096 return T->getStmtClass() == ParenExprClass; 1097 } 1098 static bool classof(const ParenExpr *) { return true; } 1099 1100 // Iterators 1101 virtual child_iterator child_begin(); 1102 virtual child_iterator child_end(); 1103}; 1104 1105 1106/// UnaryOperator - This represents the unary-expression's (except sizeof and 1107/// alignof), the postinc/postdec operators from postfix-expression, and various 1108/// extensions. 1109/// 1110/// Notes on various nodes: 1111/// 1112/// Real/Imag - These return the real/imag part of a complex operand. If 1113/// applied to a non-complex value, the former returns its operand and the 1114/// later returns zero in the type of the operand. 1115/// 1116class UnaryOperator : public Expr { 1117public: 1118 typedef UnaryOperatorKind Opcode; 1119 1120private: 1121 unsigned Opc : 5; 1122 SourceLocation Loc; 1123 Stmt *Val; 1124public: 1125 1126 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 1127 : Expr(UnaryOperatorClass, type, 1128 input->isTypeDependent() || type->isDependentType(), 1129 input->isValueDependent()), 1130 Opc(opc), Loc(l), Val(input) {} 1131 1132 /// \brief Build an empty unary operator. 1133 explicit UnaryOperator(EmptyShell Empty) 1134 : Expr(UnaryOperatorClass, Empty), Opc(UO_AddrOf) { } 1135 1136 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 1137 void setOpcode(Opcode O) { Opc = O; } 1138 1139 Expr *getSubExpr() const { return cast<Expr>(Val); } 1140 void setSubExpr(Expr *E) { Val = E; } 1141 1142 /// getOperatorLoc - Return the location of the operator. 1143 SourceLocation getOperatorLoc() const { return Loc; } 1144 void setOperatorLoc(SourceLocation L) { Loc = L; } 1145 1146 /// isPostfix - Return true if this is a postfix operation, like x++. 1147 static bool isPostfix(Opcode Op) { 1148 return Op == UO_PostInc || Op == UO_PostDec; 1149 } 1150 1151 /// isPostfix - Return true if this is a prefix operation, like --x. 1152 static bool isPrefix(Opcode Op) { 1153 return Op == UO_PreInc || Op == UO_PreDec; 1154 } 1155 1156 bool isPrefix() const { return isPrefix(getOpcode()); } 1157 bool isPostfix() const { return isPostfix(getOpcode()); } 1158 bool isIncrementOp() const { 1159 return Opc == UO_PreInc || Opc == UO_PostInc; 1160 } 1161 bool isIncrementDecrementOp() const { 1162 return Opc <= UO_PreDec; 1163 } 1164 static bool isArithmeticOp(Opcode Op) { 1165 return Op >= UO_Plus && Op <= UO_LNot; 1166 } 1167 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); } 1168 1169 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1170 /// corresponds to, e.g. "sizeof" or "[pre]++" 1171 static const char *getOpcodeStr(Opcode Op); 1172 1173 /// \brief Retrieve the unary opcode that corresponds to the given 1174 /// overloaded operator. 1175 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 1176 1177 /// \brief Retrieve the overloaded operator kind that corresponds to 1178 /// the given unary opcode. 1179 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1180 1181 virtual SourceRange getSourceRange() const { 1182 if (isPostfix()) 1183 return SourceRange(Val->getLocStart(), Loc); 1184 else 1185 return SourceRange(Loc, Val->getLocEnd()); 1186 } 1187 virtual SourceLocation getExprLoc() const { return Loc; } 1188 1189 static bool classof(const Stmt *T) { 1190 return T->getStmtClass() == UnaryOperatorClass; 1191 } 1192 static bool classof(const UnaryOperator *) { return true; } 1193 1194 // Iterators 1195 virtual child_iterator child_begin(); 1196 virtual child_iterator child_end(); 1197}; 1198 1199/// OffsetOfExpr - [C99 7.17] - This represents an expression of the form 1200/// offsetof(record-type, member-designator). For example, given: 1201/// @code 1202/// struct S { 1203/// float f; 1204/// double d; 1205/// }; 1206/// struct T { 1207/// int i; 1208/// struct S s[10]; 1209/// }; 1210/// @endcode 1211/// we can represent and evaluate the expression @c offsetof(struct T, s[2].d). 1212 1213class OffsetOfExpr : public Expr { 1214public: 1215 // __builtin_offsetof(type, identifier(.identifier|[expr])*) 1216 class OffsetOfNode { 1217 public: 1218 /// \brief The kind of offsetof node we have. 1219 enum Kind { 1220 /// \brief An index into an array. 1221 Array = 0x00, 1222 /// \brief A field. 1223 Field = 0x01, 1224 /// \brief A field in a dependent type, known only by its name. 1225 Identifier = 0x02, 1226 /// \brief An implicit indirection through a C++ base class, when the 1227 /// field found is in a base class. 1228 Base = 0x03 1229 }; 1230 1231 private: 1232 enum { MaskBits = 2, Mask = 0x03 }; 1233 1234 /// \brief The source range that covers this part of the designator. 1235 SourceRange Range; 1236 1237 /// \brief The data describing the designator, which comes in three 1238 /// different forms, depending on the lower two bits. 1239 /// - An unsigned index into the array of Expr*'s stored after this node 1240 /// in memory, for [constant-expression] designators. 1241 /// - A FieldDecl*, for references to a known field. 1242 /// - An IdentifierInfo*, for references to a field with a given name 1243 /// when the class type is dependent. 1244 /// - A CXXBaseSpecifier*, for references that look at a field in a 1245 /// base class. 1246 uintptr_t Data; 1247 1248 public: 1249 /// \brief Create an offsetof node that refers to an array element. 1250 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index, 1251 SourceLocation RBracketLoc) 1252 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) { } 1253 1254 /// \brief Create an offsetof node that refers to a field. 1255 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, 1256 SourceLocation NameLoc) 1257 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1258 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) { } 1259 1260 /// \brief Create an offsetof node that refers to an identifier. 1261 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name, 1262 SourceLocation NameLoc) 1263 : Range(DotLoc.isValid()? DotLoc : NameLoc, NameLoc), 1264 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) { } 1265 1266 /// \brief Create an offsetof node that refers into a C++ base class. 1267 explicit OffsetOfNode(const CXXBaseSpecifier *Base) 1268 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {} 1269 1270 /// \brief Determine what kind of offsetof node this is. 1271 Kind getKind() const { 1272 return static_cast<Kind>(Data & Mask); 1273 } 1274 1275 /// \brief For an array element node, returns the index into the array 1276 /// of expressions. 1277 unsigned getArrayExprIndex() const { 1278 assert(getKind() == Array); 1279 return Data >> 2; 1280 } 1281 1282 /// \brief For a field offsetof node, returns the field. 1283 FieldDecl *getField() const { 1284 assert(getKind() == Field); 1285 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask); 1286 } 1287 1288 /// \brief For a field or identifier offsetof node, returns the name of 1289 /// the field. 1290 IdentifierInfo *getFieldName() const; 1291 1292 /// \brief For a base class node, returns the base specifier. 1293 CXXBaseSpecifier *getBase() const { 1294 assert(getKind() == Base); 1295 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask); 1296 } 1297 1298 /// \brief Retrieve the source range that covers this offsetof node. 1299 /// 1300 /// For an array element node, the source range contains the locations of 1301 /// the square brackets. For a field or identifier node, the source range 1302 /// contains the location of the period (if there is one) and the 1303 /// identifier. 1304 SourceRange getRange() const { return Range; } 1305 }; 1306 1307private: 1308 1309 SourceLocation OperatorLoc, RParenLoc; 1310 // Base type; 1311 TypeSourceInfo *TSInfo; 1312 // Number of sub-components (i.e. instances of OffsetOfNode). 1313 unsigned NumComps; 1314 // Number of sub-expressions (i.e. array subscript expressions). 1315 unsigned NumExprs; 1316 1317 OffsetOfExpr(ASTContext &C, QualType type, 1318 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1319 OffsetOfNode* compsPtr, unsigned numComps, 1320 Expr** exprsPtr, unsigned numExprs, 1321 SourceLocation RParenLoc); 1322 1323 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs) 1324 : Expr(OffsetOfExprClass, EmptyShell()), 1325 TSInfo(0), NumComps(numComps), NumExprs(numExprs) {} 1326 1327public: 1328 1329 static OffsetOfExpr *Create(ASTContext &C, QualType type, 1330 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 1331 OffsetOfNode* compsPtr, unsigned numComps, 1332 Expr** exprsPtr, unsigned numExprs, 1333 SourceLocation RParenLoc); 1334 1335 static OffsetOfExpr *CreateEmpty(ASTContext &C, 1336 unsigned NumComps, unsigned NumExprs); 1337 1338 /// getOperatorLoc - Return the location of the operator. 1339 SourceLocation getOperatorLoc() const { return OperatorLoc; } 1340 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; } 1341 1342 /// \brief Return the location of the right parentheses. 1343 SourceLocation getRParenLoc() const { return RParenLoc; } 1344 void setRParenLoc(SourceLocation R) { RParenLoc = R; } 1345 1346 TypeSourceInfo *getTypeSourceInfo() const { 1347 return TSInfo; 1348 } 1349 void setTypeSourceInfo(TypeSourceInfo *tsi) { 1350 TSInfo = tsi; 1351 } 1352 1353 const OffsetOfNode &getComponent(unsigned Idx) { 1354 assert(Idx < NumComps && "Subscript out of range"); 1355 return reinterpret_cast<OffsetOfNode *> (this + 1)[Idx]; 1356 } 1357 1358 void setComponent(unsigned Idx, OffsetOfNode ON) { 1359 assert(Idx < NumComps && "Subscript out of range"); 1360 reinterpret_cast<OffsetOfNode *> (this + 1)[Idx] = ON; 1361 } 1362 1363 unsigned getNumComponents() const { 1364 return NumComps; 1365 } 1366 1367 Expr* getIndexExpr(unsigned Idx) { 1368 assert(Idx < NumExprs && "Subscript out of range"); 1369 return reinterpret_cast<Expr **>( 1370 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx]; 1371 } 1372 1373 void setIndexExpr(unsigned Idx, Expr* E) { 1374 assert(Idx < NumComps && "Subscript out of range"); 1375 reinterpret_cast<Expr **>( 1376 reinterpret_cast<OffsetOfNode *>(this+1) + NumComps)[Idx] = E; 1377 } 1378 1379 unsigned getNumExpressions() const { 1380 return NumExprs; 1381 } 1382 1383 virtual SourceRange getSourceRange() const { 1384 return SourceRange(OperatorLoc, RParenLoc); 1385 } 1386 1387 static bool classof(const Stmt *T) { 1388 return T->getStmtClass() == OffsetOfExprClass; 1389 } 1390 1391 static bool classof(const OffsetOfExpr *) { return true; } 1392 1393 // Iterators 1394 virtual child_iterator child_begin(); 1395 virtual child_iterator child_end(); 1396}; 1397 1398/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1399/// types and expressions. 1400class SizeOfAlignOfExpr : public Expr { 1401 bool isSizeof : 1; // true if sizeof, false if alignof. 1402 bool isType : 1; // true if operand is a type, false if an expression 1403 union { 1404 TypeSourceInfo *Ty; 1405 Stmt *Ex; 1406 } Argument; 1407 SourceLocation OpLoc, RParenLoc; 1408 1409public: 1410 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 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 TInfo->getType()->isDependentType()), 1417 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1418 Argument.Ty = TInfo; 1419 } 1420 1421 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1422 QualType resultType, SourceLocation op, 1423 SourceLocation rp) : 1424 Expr(SizeOfAlignOfExprClass, resultType, 1425 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1426 // Value-dependent if the argument is type-dependent. 1427 E->isTypeDependent()), 1428 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1429 Argument.Ex = E; 1430 } 1431 1432 /// \brief Construct an empty sizeof/alignof expression. 1433 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1434 : Expr(SizeOfAlignOfExprClass, Empty) { } 1435 1436 bool isSizeOf() const { return isSizeof; } 1437 void setSizeof(bool S) { isSizeof = S; } 1438 1439 bool isArgumentType() const { return isType; } 1440 QualType getArgumentType() const { 1441 return getArgumentTypeInfo()->getType(); 1442 } 1443 TypeSourceInfo *getArgumentTypeInfo() const { 1444 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1445 return Argument.Ty; 1446 } 1447 Expr *getArgumentExpr() { 1448 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1449 return static_cast<Expr*>(Argument.Ex); 1450 } 1451 const Expr *getArgumentExpr() const { 1452 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1453 } 1454 1455 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1456 void setArgument(TypeSourceInfo *TInfo) { 1457 Argument.Ty = TInfo; 1458 isType = true; 1459 } 1460 1461 /// Gets the argument type, or the type of the argument expression, whichever 1462 /// is appropriate. 1463 QualType getTypeOfArgument() const { 1464 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1465 } 1466 1467 SourceLocation getOperatorLoc() const { return OpLoc; } 1468 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1469 1470 SourceLocation getRParenLoc() const { return RParenLoc; } 1471 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1472 1473 virtual SourceRange getSourceRange() const { 1474 return SourceRange(OpLoc, RParenLoc); 1475 } 1476 1477 static bool classof(const Stmt *T) { 1478 return T->getStmtClass() == SizeOfAlignOfExprClass; 1479 } 1480 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1481 1482 // Iterators 1483 virtual child_iterator child_begin(); 1484 virtual child_iterator child_end(); 1485}; 1486 1487//===----------------------------------------------------------------------===// 1488// Postfix Operators. 1489//===----------------------------------------------------------------------===// 1490 1491/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1492class ArraySubscriptExpr : public Expr { 1493 enum { LHS, RHS, END_EXPR=2 }; 1494 Stmt* SubExprs[END_EXPR]; 1495 SourceLocation RBracketLoc; 1496public: 1497 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1498 SourceLocation rbracketloc) 1499 : Expr(ArraySubscriptExprClass, t, 1500 lhs->isTypeDependent() || rhs->isTypeDependent(), 1501 lhs->isValueDependent() || rhs->isValueDependent()), 1502 RBracketLoc(rbracketloc) { 1503 SubExprs[LHS] = lhs; 1504 SubExprs[RHS] = rhs; 1505 } 1506 1507 /// \brief Create an empty array subscript expression. 1508 explicit ArraySubscriptExpr(EmptyShell Shell) 1509 : Expr(ArraySubscriptExprClass, Shell) { } 1510 1511 /// An array access can be written A[4] or 4[A] (both are equivalent). 1512 /// - getBase() and getIdx() always present the normalized view: A[4]. 1513 /// In this case getBase() returns "A" and getIdx() returns "4". 1514 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1515 /// 4[A] getLHS() returns "4". 1516 /// Note: Because vector element access is also written A[4] we must 1517 /// predicate the format conversion in getBase and getIdx only on the 1518 /// the type of the RHS, as it is possible for the LHS to be a vector of 1519 /// integer type 1520 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1521 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1522 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1523 1524 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1525 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1526 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1527 1528 Expr *getBase() { 1529 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1530 } 1531 1532 const Expr *getBase() const { 1533 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1534 } 1535 1536 Expr *getIdx() { 1537 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1538 } 1539 1540 const Expr *getIdx() const { 1541 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1542 } 1543 1544 virtual SourceRange getSourceRange() const { 1545 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1546 } 1547 1548 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1549 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1550 1551 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1552 1553 static bool classof(const Stmt *T) { 1554 return T->getStmtClass() == ArraySubscriptExprClass; 1555 } 1556 static bool classof(const ArraySubscriptExpr *) { return true; } 1557 1558 // Iterators 1559 virtual child_iterator child_begin(); 1560 virtual child_iterator child_end(); 1561}; 1562 1563 1564/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1565/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1566/// while its subclasses may represent alternative syntax that (semantically) 1567/// results in a function call. For example, CXXOperatorCallExpr is 1568/// a subclass for overloaded operator calls that use operator syntax, e.g., 1569/// "str1 + str2" to resolve to a function call. 1570class CallExpr : public Expr { 1571 enum { FN=0, ARGS_START=1 }; 1572 Stmt **SubExprs; 1573 unsigned NumArgs; 1574 SourceLocation RParenLoc; 1575 1576protected: 1577 // This version of the constructor is for derived classes. 1578 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1579 QualType t, SourceLocation rparenloc); 1580 1581public: 1582 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1583 SourceLocation rparenloc); 1584 1585 /// \brief Build an empty call expression. 1586 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1587 1588 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1589 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1590 void setCallee(Expr *F) { SubExprs[FN] = F; } 1591 1592 Decl *getCalleeDecl(); 1593 const Decl *getCalleeDecl() const { 1594 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1595 } 1596 1597 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1598 FunctionDecl *getDirectCallee(); 1599 const FunctionDecl *getDirectCallee() const { 1600 return const_cast<CallExpr*>(this)->getDirectCallee(); 1601 } 1602 1603 /// getNumArgs - Return the number of actual arguments to this call. 1604 /// 1605 unsigned getNumArgs() const { return NumArgs; } 1606 1607 /// getArg - Return the specified argument. 1608 Expr *getArg(unsigned Arg) { 1609 assert(Arg < NumArgs && "Arg access out of range!"); 1610 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1611 } 1612 const Expr *getArg(unsigned Arg) const { 1613 assert(Arg < NumArgs && "Arg access out of range!"); 1614 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1615 } 1616 1617 /// setArg - Set the specified argument. 1618 void setArg(unsigned Arg, Expr *ArgExpr) { 1619 assert(Arg < NumArgs && "Arg access out of range!"); 1620 SubExprs[Arg+ARGS_START] = ArgExpr; 1621 } 1622 1623 /// setNumArgs - This changes the number of arguments present in this call. 1624 /// Any orphaned expressions are deleted by this, and any new operands are set 1625 /// to null. 1626 void setNumArgs(ASTContext& C, unsigned NumArgs); 1627 1628 typedef ExprIterator arg_iterator; 1629 typedef ConstExprIterator const_arg_iterator; 1630 1631 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1632 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1633 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1634 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1635 1636 /// getNumCommas - Return the number of commas that must have been present in 1637 /// this function call. 1638 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1639 1640 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1641 /// not, return 0. 1642 unsigned isBuiltinCall(ASTContext &Context) const; 1643 1644 /// getCallReturnType - Get the return type of the call expr. This is not 1645 /// always the type of the expr itself, if the return type is a reference 1646 /// type. 1647 QualType getCallReturnType() const; 1648 1649 SourceLocation getRParenLoc() const { return RParenLoc; } 1650 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1651 1652 virtual SourceRange getSourceRange() const { 1653 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1654 } 1655 1656 static bool classof(const Stmt *T) { 1657 return T->getStmtClass() >= firstCallExprConstant && 1658 T->getStmtClass() <= lastCallExprConstant; 1659 } 1660 static bool classof(const CallExpr *) { return true; } 1661 1662 // Iterators 1663 virtual child_iterator child_begin(); 1664 virtual child_iterator child_end(); 1665}; 1666 1667/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1668/// 1669class MemberExpr : public Expr { 1670 /// Extra data stored in some member expressions. 1671 struct MemberNameQualifier : public NameQualifier { 1672 DeclAccessPair FoundDecl; 1673 }; 1674 1675 /// Base - the expression for the base pointer or structure references. In 1676 /// X.F, this is "X". 1677 Stmt *Base; 1678 1679 /// MemberDecl - This is the decl being referenced by the field/member name. 1680 /// In X.F, this is the decl referenced by F. 1681 ValueDecl *MemberDecl; 1682 1683 /// MemberLoc - This is the location of the member name. 1684 SourceLocation MemberLoc; 1685 1686 /// MemberDNLoc - Provides source/type location info for the 1687 /// declaration name embedded in MemberDecl. 1688 DeclarationNameLoc MemberDNLoc; 1689 1690 /// IsArrow - True if this is "X->F", false if this is "X.F". 1691 bool IsArrow : 1; 1692 1693 /// \brief True if this member expression used a nested-name-specifier to 1694 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1695 /// declaration. When true, a MemberNameQualifier 1696 /// structure is allocated immediately after the MemberExpr. 1697 bool HasQualifierOrFoundDecl : 1; 1698 1699 /// \brief True if this member expression specified a template argument list 1700 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1701 /// structure (and its TemplateArguments) are allocated immediately after 1702 /// the MemberExpr or, if the member expression also has a qualifier, after 1703 /// the MemberNameQualifier structure. 1704 bool HasExplicitTemplateArgumentList : 1; 1705 1706 /// \brief Retrieve the qualifier that preceded the member name, if any. 1707 MemberNameQualifier *getMemberQualifier() { 1708 assert(HasQualifierOrFoundDecl); 1709 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1710 } 1711 1712 /// \brief Retrieve the qualifier that preceded the member name, if any. 1713 const MemberNameQualifier *getMemberQualifier() const { 1714 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1715 } 1716 1717public: 1718 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1719 const DeclarationNameInfo &NameInfo, QualType ty) 1720 : Expr(MemberExprClass, ty, 1721 base->isTypeDependent(), base->isValueDependent()), 1722 Base(base), MemberDecl(memberdecl), MemberLoc(NameInfo.getLoc()), 1723 MemberDNLoc(NameInfo.getInfo()), IsArrow(isarrow), 1724 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) { 1725 assert(memberdecl->getDeclName() == NameInfo.getName()); 1726 } 1727 1728 // NOTE: this constructor should be used only when it is known that 1729 // the member name can not provide additional syntactic info 1730 // (i.e., source locations for C++ operator names or type source info 1731 // for constructors, destructors and conversion oeprators). 1732 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1733 SourceLocation l, QualType ty) 1734 : Expr(MemberExprClass, ty, 1735 base->isTypeDependent(), base->isValueDependent()), 1736 Base(base), MemberDecl(memberdecl), MemberLoc(l), MemberDNLoc(), 1737 IsArrow(isarrow), 1738 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1739 1740 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1741 NestedNameSpecifier *qual, SourceRange qualrange, 1742 ValueDecl *memberdecl, DeclAccessPair founddecl, 1743 DeclarationNameInfo MemberNameInfo, 1744 const TemplateArgumentListInfo *targs, 1745 QualType ty); 1746 1747 void setBase(Expr *E) { Base = E; } 1748 Expr *getBase() const { return cast<Expr>(Base); } 1749 1750 /// \brief Retrieve the member declaration to which this expression refers. 1751 /// 1752 /// The returned declaration will either be a FieldDecl or (in C++) 1753 /// a CXXMethodDecl. 1754 ValueDecl *getMemberDecl() const { return MemberDecl; } 1755 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1756 1757 /// \brief Retrieves the declaration found by lookup. 1758 DeclAccessPair getFoundDecl() const { 1759 if (!HasQualifierOrFoundDecl) 1760 return DeclAccessPair::make(getMemberDecl(), 1761 getMemberDecl()->getAccess()); 1762 return getMemberQualifier()->FoundDecl; 1763 } 1764 1765 /// \brief Determines whether this member expression actually had 1766 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1767 /// x->Base::foo. 1768 bool hasQualifier() const { return getQualifier() != 0; } 1769 1770 /// \brief If the member name was qualified, retrieves the source range of 1771 /// the nested-name-specifier that precedes the member name. Otherwise, 1772 /// returns an empty source range. 1773 SourceRange getQualifierRange() const { 1774 if (!HasQualifierOrFoundDecl) 1775 return SourceRange(); 1776 1777 return getMemberQualifier()->Range; 1778 } 1779 1780 /// \brief If the member name was qualified, retrieves the 1781 /// nested-name-specifier that precedes the member name. Otherwise, returns 1782 /// NULL. 1783 NestedNameSpecifier *getQualifier() const { 1784 if (!HasQualifierOrFoundDecl) 1785 return 0; 1786 1787 return getMemberQualifier()->NNS; 1788 } 1789 1790 /// \brief Determines whether this member expression actually had a C++ 1791 /// template argument list explicitly specified, e.g., x.f<int>. 1792 bool hasExplicitTemplateArgs() const { 1793 return HasExplicitTemplateArgumentList; 1794 } 1795 1796 /// \brief Copies the template arguments (if present) into the given 1797 /// structure. 1798 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1799 if (hasExplicitTemplateArgs()) 1800 getExplicitTemplateArgs().copyInto(List); 1801 } 1802 1803 /// \brief Retrieve the explicit template argument list that 1804 /// follow the member template name. This must only be called on an 1805 /// expression with explicit template arguments. 1806 ExplicitTemplateArgumentList &getExplicitTemplateArgs() { 1807 assert(HasExplicitTemplateArgumentList); 1808 if (!HasQualifierOrFoundDecl) 1809 return *reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1810 1811 return *reinterpret_cast<ExplicitTemplateArgumentList *>( 1812 getMemberQualifier() + 1); 1813 } 1814 1815 /// \brief Retrieve the explicit template argument list that 1816 /// followed the member template name. This must only be called on 1817 /// an expression with explicit template arguments. 1818 const ExplicitTemplateArgumentList &getExplicitTemplateArgs() const { 1819 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgs(); 1820 } 1821 1822 /// \brief Retrieves the optional explicit template arguments. 1823 /// This points to the same data as getExplicitTemplateArgs(), but 1824 /// returns null if there are no explicit template arguments. 1825 const ExplicitTemplateArgumentList *getOptionalExplicitTemplateArgs() const { 1826 if (!hasExplicitTemplateArgs()) return 0; 1827 return &getExplicitTemplateArgs(); 1828 } 1829 1830 /// \brief Retrieve the location of the left angle bracket following the 1831 /// member name ('<'), if any. 1832 SourceLocation getLAngleLoc() const { 1833 if (!HasExplicitTemplateArgumentList) 1834 return SourceLocation(); 1835 1836 return getExplicitTemplateArgs().LAngleLoc; 1837 } 1838 1839 /// \brief Retrieve the template arguments provided as part of this 1840 /// template-id. 1841 const TemplateArgumentLoc *getTemplateArgs() const { 1842 if (!HasExplicitTemplateArgumentList) 1843 return 0; 1844 1845 return getExplicitTemplateArgs().getTemplateArgs(); 1846 } 1847 1848 /// \brief Retrieve the number of template arguments provided as part of this 1849 /// template-id. 1850 unsigned getNumTemplateArgs() const { 1851 if (!HasExplicitTemplateArgumentList) 1852 return 0; 1853 1854 return getExplicitTemplateArgs().NumTemplateArgs; 1855 } 1856 1857 /// \brief Retrieve the location of the right angle bracket following the 1858 /// template arguments ('>'). 1859 SourceLocation getRAngleLoc() const { 1860 if (!HasExplicitTemplateArgumentList) 1861 return SourceLocation(); 1862 1863 return getExplicitTemplateArgs().RAngleLoc; 1864 } 1865 1866 /// \brief Retrieve the member declaration name info. 1867 DeclarationNameInfo getMemberNameInfo() const { 1868 return DeclarationNameInfo(MemberDecl->getDeclName(), 1869 MemberLoc, MemberDNLoc); 1870 } 1871 1872 bool isArrow() const { return IsArrow; } 1873 void setArrow(bool A) { IsArrow = A; } 1874 1875 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1876 /// location of 'F'. 1877 SourceLocation getMemberLoc() const { return MemberLoc; } 1878 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1879 1880 virtual SourceRange getSourceRange() const { 1881 // If we have an implicit base (like a C++ implicit this), 1882 // make sure not to return its location 1883 SourceLocation EndLoc = (HasExplicitTemplateArgumentList) 1884 ? getRAngleLoc() : getMemberNameInfo().getEndLoc(); 1885 1886 SourceLocation BaseLoc = getBase()->getLocStart(); 1887 if (BaseLoc.isInvalid()) 1888 return SourceRange(MemberLoc, EndLoc); 1889 return SourceRange(BaseLoc, EndLoc); 1890 } 1891 1892 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1893 1894 static bool classof(const Stmt *T) { 1895 return T->getStmtClass() == MemberExprClass; 1896 } 1897 static bool classof(const MemberExpr *) { return true; } 1898 1899 // Iterators 1900 virtual child_iterator child_begin(); 1901 virtual child_iterator child_end(); 1902 1903 friend class ASTReader; 1904 friend class ASTStmtWriter; 1905}; 1906 1907/// CompoundLiteralExpr - [C99 6.5.2.5] 1908/// 1909class CompoundLiteralExpr : public Expr { 1910 /// LParenLoc - If non-null, this is the location of the left paren in a 1911 /// compound literal like "(int){4}". This can be null if this is a 1912 /// synthesized compound expression. 1913 SourceLocation LParenLoc; 1914 1915 /// The type as written. This can be an incomplete array type, in 1916 /// which case the actual expression type will be different. 1917 TypeSourceInfo *TInfo; 1918 Stmt *Init; 1919 bool FileScope; 1920public: 1921 // FIXME: Can compound literals be value-dependent? 1922 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 1923 QualType T, Expr *init, bool fileScope) 1924 : Expr(CompoundLiteralExprClass, T, 1925 tinfo->getType()->isDependentType(), false), 1926 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 1927 1928 /// \brief Construct an empty compound literal. 1929 explicit CompoundLiteralExpr(EmptyShell Empty) 1930 : Expr(CompoundLiteralExprClass, Empty) { } 1931 1932 const Expr *getInitializer() const { return cast<Expr>(Init); } 1933 Expr *getInitializer() { return cast<Expr>(Init); } 1934 void setInitializer(Expr *E) { Init = E; } 1935 1936 bool isFileScope() const { return FileScope; } 1937 void setFileScope(bool FS) { FileScope = FS; } 1938 1939 SourceLocation getLParenLoc() const { return LParenLoc; } 1940 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1941 1942 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 1943 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 1944 1945 virtual SourceRange getSourceRange() const { 1946 // FIXME: Init should never be null. 1947 if (!Init) 1948 return SourceRange(); 1949 if (LParenLoc.isInvalid()) 1950 return Init->getSourceRange(); 1951 return SourceRange(LParenLoc, Init->getLocEnd()); 1952 } 1953 1954 static bool classof(const Stmt *T) { 1955 return T->getStmtClass() == CompoundLiteralExprClass; 1956 } 1957 static bool classof(const CompoundLiteralExpr *) { return true; } 1958 1959 // Iterators 1960 virtual child_iterator child_begin(); 1961 virtual child_iterator child_end(); 1962}; 1963 1964/// CastExpr - Base class for type casts, including both implicit 1965/// casts (ImplicitCastExpr) and explicit casts that have some 1966/// representation in the source code (ExplicitCastExpr's derived 1967/// classes). 1968class CastExpr : public Expr { 1969public: 1970 typedef clang::CastKind CastKind; 1971 1972private: 1973 Stmt *Op; 1974 1975 void CheckCastConsistency() const { 1976#ifndef NDEBUG 1977 switch (getCastKind()) { 1978 case CK_DerivedToBase: 1979 case CK_UncheckedDerivedToBase: 1980 case CK_DerivedToBaseMemberPointer: 1981 case CK_BaseToDerived: 1982 case CK_BaseToDerivedMemberPointer: 1983 assert(!path_empty() && "Cast kind should have a base path!"); 1984 break; 1985 1986 // These should not have an inheritance path. 1987 case CK_BitCast: 1988 case CK_Dynamic: 1989 case CK_ToUnion: 1990 case CK_ArrayToPointerDecay: 1991 case CK_FunctionToPointerDecay: 1992 case CK_NullToMemberPointer: 1993 case CK_NullToPointer: 1994 case CK_ConstructorConversion: 1995 case CK_IntegralToPointer: 1996 case CK_PointerToIntegral: 1997 case CK_ToVoid: 1998 case CK_VectorSplat: 1999 case CK_IntegralCast: 2000 case CK_IntegralToFloating: 2001 case CK_FloatingToIntegral: 2002 case CK_FloatingCast: 2003 case CK_AnyPointerToObjCPointerCast: 2004 case CK_AnyPointerToBlockPointerCast: 2005 case CK_ObjCObjectLValueCast: 2006 case CK_FloatingRealToComplex: 2007 case CK_FloatingComplexToReal: 2008 case CK_FloatingComplexCast: 2009 case CK_FloatingComplexToIntegralComplex: 2010 case CK_IntegralRealToComplex: 2011 case CK_IntegralComplexToReal: 2012 case CK_IntegralComplexCast: 2013 case CK_IntegralComplexToFloatingComplex: 2014 assert(!getType()->isBooleanType() && "unheralded conversion to bool"); 2015 // fallthrough to check for null base path 2016 2017 case CK_Dependent: 2018 case CK_NoOp: 2019 case CK_PointerToBoolean: 2020 case CK_IntegralToBoolean: 2021 case CK_FloatingToBoolean: 2022 case CK_MemberPointerToBoolean: 2023 case CK_FloatingComplexToBoolean: 2024 case CK_IntegralComplexToBoolean: 2025 case CK_LValueBitCast: // -> bool& 2026 case CK_UserDefinedConversion: // operator bool() 2027 assert(path_empty() && "Cast kind should not have a base path!"); 2028 break; 2029 } 2030#endif 2031 } 2032 2033 const CXXBaseSpecifier * const *path_buffer() const { 2034 return const_cast<CastExpr*>(this)->path_buffer(); 2035 } 2036 CXXBaseSpecifier **path_buffer(); 2037 2038protected: 2039 CastExpr(StmtClass SC, QualType ty, const CastKind kind, Expr *op, 2040 unsigned BasePathSize) : 2041 Expr(SC, ty, 2042 // Cast expressions are type-dependent if the type is 2043 // dependent (C++ [temp.dep.expr]p3). 2044 ty->isDependentType(), 2045 // Cast expressions are value-dependent if the type is 2046 // dependent or if the subexpression is value-dependent. 2047 ty->isDependentType() || (op && op->isValueDependent())), 2048 Op(op) { 2049 assert(kind != CK_Invalid && "creating cast with invalid cast kind"); 2050 CastExprBits.Kind = kind; 2051 CastExprBits.BasePathSize = BasePathSize; 2052 CheckCastConsistency(); 2053 } 2054 2055 /// \brief Construct an empty cast. 2056 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize) 2057 : Expr(SC, Empty) { 2058 CastExprBits.BasePathSize = BasePathSize; 2059 } 2060 2061public: 2062 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; } 2063 void setCastKind(CastKind K) { CastExprBits.Kind = K; } 2064 const char *getCastKindName() const; 2065 2066 Expr *getSubExpr() { return cast<Expr>(Op); } 2067 const Expr *getSubExpr() const { return cast<Expr>(Op); } 2068 void setSubExpr(Expr *E) { Op = E; } 2069 2070 /// \brief Retrieve the cast subexpression as it was written in the source 2071 /// code, looking through any implicit casts or other intermediate nodes 2072 /// introduced by semantic analysis. 2073 Expr *getSubExprAsWritten(); 2074 const Expr *getSubExprAsWritten() const { 2075 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 2076 } 2077 2078 typedef CXXBaseSpecifier **path_iterator; 2079 typedef const CXXBaseSpecifier * const *path_const_iterator; 2080 bool path_empty() const { return CastExprBits.BasePathSize == 0; } 2081 unsigned path_size() const { return CastExprBits.BasePathSize; } 2082 path_iterator path_begin() { return path_buffer(); } 2083 path_iterator path_end() { return path_buffer() + path_size(); } 2084 path_const_iterator path_begin() const { return path_buffer(); } 2085 path_const_iterator path_end() const { return path_buffer() + path_size(); } 2086 2087 void setCastPath(const CXXCastPath &Path); 2088 2089 static bool classof(const Stmt *T) { 2090 return T->getStmtClass() >= firstCastExprConstant && 2091 T->getStmtClass() <= lastCastExprConstant; 2092 } 2093 static bool classof(const CastExpr *) { return true; } 2094 2095 // Iterators 2096 virtual child_iterator child_begin(); 2097 virtual child_iterator child_end(); 2098}; 2099 2100/// ImplicitCastExpr - Allows us to explicitly represent implicit type 2101/// conversions, which have no direct representation in the original 2102/// source code. For example: converting T[]->T*, void f()->void 2103/// (*f)(), float->double, short->int, etc. 2104/// 2105/// In C, implicit casts always produce rvalues. However, in C++, an 2106/// implicit cast whose result is being bound to a reference will be 2107/// an lvalue or xvalue. For example: 2108/// 2109/// @code 2110/// class Base { }; 2111/// class Derived : public Base { }; 2112/// Derived &&ref(); 2113/// void f(Derived d) { 2114/// Base& b = d; // initializer is an ImplicitCastExpr 2115/// // to an lvalue of type Base 2116/// Base&& r = ref(); // initializer is an ImplicitCastExpr 2117/// // to an xvalue of type Base 2118/// } 2119/// @endcode 2120class ImplicitCastExpr : public CastExpr { 2121private: 2122 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 2123 unsigned BasePathLength, ExprValueKind VK) 2124 : CastExpr(ImplicitCastExprClass, ty, kind, op, BasePathLength) { 2125 setValueKind(VK); 2126 } 2127 2128 /// \brief Construct an empty implicit cast. 2129 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize) 2130 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { } 2131 2132public: 2133 enum OnStack_t { OnStack }; 2134 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op, 2135 ExprValueKind VK) 2136 : CastExpr(ImplicitCastExprClass, ty, kind, op, 0) { 2137 setValueKind(VK); 2138 } 2139 2140 static ImplicitCastExpr *Create(ASTContext &Context, QualType T, 2141 CastKind Kind, Expr *Operand, 2142 const CXXCastPath *BasePath, 2143 ExprValueKind Cat); 2144 2145 static ImplicitCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2146 2147 virtual SourceRange getSourceRange() const { 2148 return getSubExpr()->getSourceRange(); 2149 } 2150 2151 using Expr::getValueKind; 2152 using Expr::setValueKind; 2153 2154 static bool classof(const Stmt *T) { 2155 return T->getStmtClass() == ImplicitCastExprClass; 2156 } 2157 static bool classof(const ImplicitCastExpr *) { return true; } 2158}; 2159 2160/// ExplicitCastExpr - An explicit cast written in the source 2161/// code. 2162/// 2163/// This class is effectively an abstract class, because it provides 2164/// the basic representation of an explicitly-written cast without 2165/// specifying which kind of cast (C cast, functional cast, static 2166/// cast, etc.) was written; specific derived classes represent the 2167/// particular style of cast and its location information. 2168/// 2169/// Unlike implicit casts, explicit cast nodes have two different 2170/// types: the type that was written into the source code, and the 2171/// actual type of the expression as determined by semantic 2172/// analysis. These types may differ slightly. For example, in C++ one 2173/// can cast to a reference type, which indicates that the resulting 2174/// expression will be an lvalue or xvalue. The reference type, however, 2175/// will not be used as the type of the expression. 2176class ExplicitCastExpr : public CastExpr { 2177 /// TInfo - Source type info for the (written) type 2178 /// this expression is casting to. 2179 TypeSourceInfo *TInfo; 2180 2181protected: 2182 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, 2183 Expr *op, unsigned PathSize, TypeSourceInfo *writtenTy) 2184 : CastExpr(SC, exprTy, kind, op, PathSize), TInfo(writtenTy) {} 2185 2186 /// \brief Construct an empty explicit cast. 2187 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize) 2188 : CastExpr(SC, Shell, PathSize) { } 2189 2190public: 2191 /// getTypeInfoAsWritten - Returns the type source info for the type 2192 /// that this expression is casting to. 2193 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 2194 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 2195 2196 /// getTypeAsWritten - Returns the type that this expression is 2197 /// casting to, as written in the source code. 2198 QualType getTypeAsWritten() const { return TInfo->getType(); } 2199 2200 static bool classof(const Stmt *T) { 2201 return T->getStmtClass() >= firstExplicitCastExprConstant && 2202 T->getStmtClass() <= lastExplicitCastExprConstant; 2203 } 2204 static bool classof(const ExplicitCastExpr *) { return true; } 2205}; 2206 2207/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 2208/// cast in C++ (C++ [expr.cast]), which uses the syntax 2209/// (Type)expr. For example: @c (int)f. 2210class CStyleCastExpr : public ExplicitCastExpr { 2211 SourceLocation LPLoc; // the location of the left paren 2212 SourceLocation RPLoc; // the location of the right paren 2213 2214 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, 2215 unsigned PathSize, TypeSourceInfo *writtenTy, 2216 SourceLocation l, SourceLocation r) 2217 : ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, PathSize, 2218 writtenTy), LPLoc(l), RPLoc(r) {} 2219 2220 /// \brief Construct an empty C-style explicit cast. 2221 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize) 2222 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { } 2223 2224public: 2225 static CStyleCastExpr *Create(ASTContext &Context, QualType T, CastKind K, 2226 Expr *Op, const CXXCastPath *BasePath, 2227 TypeSourceInfo *WrittenTy, SourceLocation L, 2228 SourceLocation R); 2229 2230 static CStyleCastExpr *CreateEmpty(ASTContext &Context, unsigned PathSize); 2231 2232 SourceLocation getLParenLoc() const { return LPLoc; } 2233 void setLParenLoc(SourceLocation L) { LPLoc = L; } 2234 2235 SourceLocation getRParenLoc() const { return RPLoc; } 2236 void setRParenLoc(SourceLocation L) { RPLoc = L; } 2237 2238 virtual SourceRange getSourceRange() const { 2239 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 2240 } 2241 static bool classof(const Stmt *T) { 2242 return T->getStmtClass() == CStyleCastExprClass; 2243 } 2244 static bool classof(const CStyleCastExpr *) { return true; } 2245}; 2246 2247/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 2248/// 2249/// This expression node kind describes a builtin binary operation, 2250/// such as "x + y" for integer values "x" and "y". The operands will 2251/// already have been converted to appropriate types (e.g., by 2252/// performing promotions or conversions). 2253/// 2254/// In C++, where operators may be overloaded, a different kind of 2255/// expression node (CXXOperatorCallExpr) is used to express the 2256/// invocation of an overloaded operator with operator syntax. Within 2257/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 2258/// used to store an expression "x + y" depends on the subexpressions 2259/// for x and y. If neither x or y is type-dependent, and the "+" 2260/// operator resolves to a built-in operation, BinaryOperator will be 2261/// used to express the computation (x and y may still be 2262/// value-dependent). If either x or y is type-dependent, or if the 2263/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 2264/// be used to express the computation. 2265class BinaryOperator : public Expr { 2266public: 2267 typedef BinaryOperatorKind Opcode; 2268 2269private: 2270 unsigned Opc : 6; 2271 SourceLocation OpLoc; 2272 2273 enum { LHS, RHS, END_EXPR }; 2274 Stmt* SubExprs[END_EXPR]; 2275public: 2276 2277 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2278 SourceLocation opLoc) 2279 : Expr(BinaryOperatorClass, ResTy, 2280 lhs->isTypeDependent() || rhs->isTypeDependent(), 2281 lhs->isValueDependent() || rhs->isValueDependent()), 2282 Opc(opc), OpLoc(opLoc) { 2283 SubExprs[LHS] = lhs; 2284 SubExprs[RHS] = rhs; 2285 assert(!isCompoundAssignmentOp() && 2286 "Use ArithAssignBinaryOperator for compound assignments"); 2287 } 2288 2289 /// \brief Construct an empty binary operator. 2290 explicit BinaryOperator(EmptyShell Empty) 2291 : Expr(BinaryOperatorClass, Empty), Opc(BO_Comma) { } 2292 2293 SourceLocation getOperatorLoc() const { return OpLoc; } 2294 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 2295 2296 Opcode getOpcode() const { return static_cast<Opcode>(Opc); } 2297 void setOpcode(Opcode O) { Opc = O; } 2298 2299 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2300 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2301 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2302 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2303 2304 virtual SourceRange getSourceRange() const { 2305 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 2306 } 2307 2308 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 2309 /// corresponds to, e.g. "<<=". 2310 static const char *getOpcodeStr(Opcode Op); 2311 2312 const char *getOpcodeStr() const { return getOpcodeStr(getOpcode()); } 2313 2314 /// \brief Retrieve the binary opcode that corresponds to the given 2315 /// overloaded operator. 2316 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 2317 2318 /// \brief Retrieve the overloaded operator kind that corresponds to 2319 /// the given binary opcode. 2320 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 2321 2322 /// predicates to categorize the respective opcodes. 2323 bool isPtrMemOp() const { return Opc == BO_PtrMemD || Opc == BO_PtrMemI; } 2324 bool isMultiplicativeOp() const { return Opc >= BO_Mul && Opc <= BO_Rem; } 2325 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; } 2326 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); } 2327 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; } 2328 bool isShiftOp() const { return isShiftOp(getOpcode()); } 2329 2330 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; } 2331 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); } 2332 2333 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; } 2334 bool isRelationalOp() const { return isRelationalOp(getOpcode()); } 2335 2336 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; } 2337 bool isEqualityOp() const { return isEqualityOp(getOpcode()); } 2338 2339 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_NE; } 2340 bool isComparisonOp() const { return isComparisonOp(getOpcode()); } 2341 2342 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; } 2343 bool isLogicalOp() const { return isLogicalOp(getOpcode()); } 2344 2345 bool isAssignmentOp() const { return Opc >= BO_Assign && Opc <= BO_OrAssign; } 2346 bool isCompoundAssignmentOp() const { 2347 return Opc > BO_Assign && Opc <= BO_OrAssign; 2348 } 2349 bool isShiftAssignOp() const { 2350 return Opc == BO_ShlAssign || Opc == BO_ShrAssign; 2351 } 2352 2353 static bool classof(const Stmt *S) { 2354 return S->getStmtClass() >= firstBinaryOperatorConstant && 2355 S->getStmtClass() <= lastBinaryOperatorConstant; 2356 } 2357 static bool classof(const BinaryOperator *) { return true; } 2358 2359 // Iterators 2360 virtual child_iterator child_begin(); 2361 virtual child_iterator child_end(); 2362 2363protected: 2364 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2365 SourceLocation opLoc, bool dead) 2366 : Expr(CompoundAssignOperatorClass, ResTy, 2367 lhs->isTypeDependent() || rhs->isTypeDependent(), 2368 lhs->isValueDependent() || rhs->isValueDependent()), 2369 Opc(opc), OpLoc(opLoc) { 2370 SubExprs[LHS] = lhs; 2371 SubExprs[RHS] = rhs; 2372 } 2373 2374 BinaryOperator(StmtClass SC, EmptyShell Empty) 2375 : Expr(SC, Empty), Opc(BO_MulAssign) { } 2376}; 2377 2378/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2379/// track of the type the operation is performed in. Due to the semantics of 2380/// these operators, the operands are promoted, the aritmetic performed, an 2381/// implicit conversion back to the result type done, then the assignment takes 2382/// place. This captures the intermediate type which the computation is done 2383/// in. 2384class CompoundAssignOperator : public BinaryOperator { 2385 QualType ComputationLHSType; 2386 QualType ComputationResultType; 2387public: 2388 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 2389 QualType ResType, QualType CompLHSType, 2390 QualType CompResultType, 2391 SourceLocation OpLoc) 2392 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 2393 ComputationLHSType(CompLHSType), 2394 ComputationResultType(CompResultType) { 2395 assert(isCompoundAssignmentOp() && 2396 "Only should be used for compound assignments"); 2397 } 2398 2399 /// \brief Build an empty compound assignment operator expression. 2400 explicit CompoundAssignOperator(EmptyShell Empty) 2401 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2402 2403 // The two computation types are the type the LHS is converted 2404 // to for the computation and the type of the result; the two are 2405 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2406 QualType getComputationLHSType() const { return ComputationLHSType; } 2407 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2408 2409 QualType getComputationResultType() const { return ComputationResultType; } 2410 void setComputationResultType(QualType T) { ComputationResultType = T; } 2411 2412 static bool classof(const CompoundAssignOperator *) { return true; } 2413 static bool classof(const Stmt *S) { 2414 return S->getStmtClass() == CompoundAssignOperatorClass; 2415 } 2416}; 2417 2418/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 2419/// GNU "missing LHS" extension is in use. 2420/// 2421class ConditionalOperator : public Expr { 2422 enum { COND, LHS, RHS, END_EXPR }; 2423 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2424 Stmt* Save; 2425 SourceLocation QuestionLoc, ColonLoc; 2426public: 2427 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2428 SourceLocation CLoc, Expr *rhs, Expr *save, QualType t) 2429 : Expr(ConditionalOperatorClass, t, 2430 // FIXME: the type of the conditional operator doesn't 2431 // depend on the type of the conditional, but the standard 2432 // seems to imply that it could. File a bug! 2433 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 2434 (cond->isValueDependent() || 2435 (lhs && lhs->isValueDependent()) || 2436 (rhs && rhs->isValueDependent()))), 2437 QuestionLoc(QLoc), 2438 ColonLoc(CLoc) { 2439 SubExprs[COND] = cond; 2440 SubExprs[LHS] = lhs; 2441 SubExprs[RHS] = rhs; 2442 Save = save; 2443 } 2444 2445 /// \brief Build an empty conditional operator. 2446 explicit ConditionalOperator(EmptyShell Empty) 2447 : Expr(ConditionalOperatorClass, Empty) { } 2448 2449 // getCond - Return the expression representing the condition for 2450 // the ?: operator. 2451 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2452 void setCond(Expr *E) { SubExprs[COND] = E; } 2453 2454 // getTrueExpr - Return the subexpression representing the value of the ?: 2455 // expression if the condition evaluates to true. 2456 Expr *getTrueExpr() const { 2457 return cast<Expr>(SubExprs[LHS]); 2458 } 2459 2460 // getFalseExpr - Return the subexpression representing the value of the ?: 2461 // expression if the condition evaluates to false. This is the same as getRHS. 2462 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2463 2464 // getSaveExpr - In most cases this value will be null. Except a GCC extension 2465 // allows the left subexpression to be omitted, and instead of that condition 2466 // be returned. e.g: x ?: y is shorthand for x ? x : y, except that the 2467 // expression "x" is only evaluated once. Under this senario, this function 2468 // returns the original, non-converted condition expression for the ?:operator 2469 Expr *getSaveExpr() const { return Save? cast<Expr>(Save) : (Expr*)0; } 2470 2471 Expr *getLHS() const { return Save ? 0 : cast<Expr>(SubExprs[LHS]); } 2472 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2473 2474 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2475 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2476 2477 Expr *getSAVE() const { return Save? cast<Expr>(Save) : (Expr*)0; } 2478 void setSAVE(Expr *E) { Save = E; } 2479 2480 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2481 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 2482 2483 SourceLocation getColonLoc() const { return ColonLoc; } 2484 void setColonLoc(SourceLocation L) { ColonLoc = L; } 2485 2486 virtual SourceRange getSourceRange() const { 2487 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2488 } 2489 static bool classof(const Stmt *T) { 2490 return T->getStmtClass() == ConditionalOperatorClass; 2491 } 2492 static bool classof(const ConditionalOperator *) { return true; } 2493 2494 // Iterators 2495 virtual child_iterator child_begin(); 2496 virtual child_iterator child_end(); 2497}; 2498 2499/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2500class AddrLabelExpr : public Expr { 2501 SourceLocation AmpAmpLoc, LabelLoc; 2502 LabelStmt *Label; 2503public: 2504 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2505 QualType t) 2506 : Expr(AddrLabelExprClass, t, false, false), 2507 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2508 2509 /// \brief Build an empty address of a label expression. 2510 explicit AddrLabelExpr(EmptyShell Empty) 2511 : Expr(AddrLabelExprClass, Empty) { } 2512 2513 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2514 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2515 SourceLocation getLabelLoc() const { return LabelLoc; } 2516 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2517 2518 virtual SourceRange getSourceRange() const { 2519 return SourceRange(AmpAmpLoc, LabelLoc); 2520 } 2521 2522 LabelStmt *getLabel() const { return Label; } 2523 void setLabel(LabelStmt *S) { Label = S; } 2524 2525 static bool classof(const Stmt *T) { 2526 return T->getStmtClass() == AddrLabelExprClass; 2527 } 2528 static bool classof(const AddrLabelExpr *) { return true; } 2529 2530 // Iterators 2531 virtual child_iterator child_begin(); 2532 virtual child_iterator child_end(); 2533}; 2534 2535/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2536/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2537/// takes the value of the last subexpression. 2538class StmtExpr : public Expr { 2539 Stmt *SubStmt; 2540 SourceLocation LParenLoc, RParenLoc; 2541public: 2542 // FIXME: Does type-dependence need to be computed differently? 2543 StmtExpr(CompoundStmt *substmt, QualType T, 2544 SourceLocation lp, SourceLocation rp) : 2545 Expr(StmtExprClass, T, T->isDependentType(), false), 2546 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2547 2548 /// \brief Build an empty statement expression. 2549 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2550 2551 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2552 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2553 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2554 2555 virtual SourceRange getSourceRange() const { 2556 return SourceRange(LParenLoc, RParenLoc); 2557 } 2558 2559 SourceLocation getLParenLoc() const { return LParenLoc; } 2560 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2561 SourceLocation getRParenLoc() const { return RParenLoc; } 2562 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2563 2564 static bool classof(const Stmt *T) { 2565 return T->getStmtClass() == StmtExprClass; 2566 } 2567 static bool classof(const StmtExpr *) { return true; } 2568 2569 // Iterators 2570 virtual child_iterator child_begin(); 2571 virtual child_iterator child_end(); 2572}; 2573 2574/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 2575/// This AST node represents a function that returns 1 if two *types* (not 2576/// expressions) are compatible. The result of this built-in function can be 2577/// used in integer constant expressions. 2578class TypesCompatibleExpr : public Expr { 2579 TypeSourceInfo *TInfo1; 2580 TypeSourceInfo *TInfo2; 2581 SourceLocation BuiltinLoc, RParenLoc; 2582public: 2583 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 2584 TypeSourceInfo *tinfo1, TypeSourceInfo *tinfo2, 2585 SourceLocation RP) : 2586 Expr(TypesCompatibleExprClass, ReturnType, false, false), 2587 TInfo1(tinfo1), TInfo2(tinfo2), BuiltinLoc(BLoc), RParenLoc(RP) {} 2588 2589 /// \brief Build an empty __builtin_type_compatible_p expression. 2590 explicit TypesCompatibleExpr(EmptyShell Empty) 2591 : Expr(TypesCompatibleExprClass, Empty) { } 2592 2593 TypeSourceInfo *getArgTInfo1() const { return TInfo1; } 2594 void setArgTInfo1(TypeSourceInfo *TInfo) { TInfo1 = TInfo; } 2595 TypeSourceInfo *getArgTInfo2() const { return TInfo2; } 2596 void setArgTInfo2(TypeSourceInfo *TInfo) { TInfo2 = TInfo; } 2597 2598 QualType getArgType1() const { return TInfo1->getType(); } 2599 QualType getArgType2() const { return TInfo2->getType(); } 2600 2601 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2602 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2603 2604 SourceLocation getRParenLoc() const { return RParenLoc; } 2605 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2606 2607 virtual SourceRange getSourceRange() const { 2608 return SourceRange(BuiltinLoc, RParenLoc); 2609 } 2610 static bool classof(const Stmt *T) { 2611 return T->getStmtClass() == TypesCompatibleExprClass; 2612 } 2613 static bool classof(const TypesCompatibleExpr *) { return true; } 2614 2615 // Iterators 2616 virtual child_iterator child_begin(); 2617 virtual child_iterator child_end(); 2618}; 2619 2620/// ShuffleVectorExpr - clang-specific builtin-in function 2621/// __builtin_shufflevector. 2622/// This AST node represents a operator that does a constant 2623/// shuffle, similar to LLVM's shufflevector instruction. It takes 2624/// two vectors and a variable number of constant indices, 2625/// and returns the appropriately shuffled vector. 2626class ShuffleVectorExpr : public Expr { 2627 SourceLocation BuiltinLoc, RParenLoc; 2628 2629 // SubExprs - the list of values passed to the __builtin_shufflevector 2630 // function. The first two are vectors, and the rest are constant 2631 // indices. The number of values in this list is always 2632 // 2+the number of indices in the vector type. 2633 Stmt **SubExprs; 2634 unsigned NumExprs; 2635 2636public: 2637 // FIXME: Can a shufflevector be value-dependent? Does type-dependence need 2638 // to be computed differently? 2639 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2640 QualType Type, SourceLocation BLoc, 2641 SourceLocation RP) : 2642 Expr(ShuffleVectorExprClass, Type, Type->isDependentType(), false), 2643 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) { 2644 2645 SubExprs = new (C) Stmt*[nexpr]; 2646 for (unsigned i = 0; i < nexpr; i++) 2647 SubExprs[i] = args[i]; 2648 } 2649 2650 /// \brief Build an empty vector-shuffle expression. 2651 explicit ShuffleVectorExpr(EmptyShell Empty) 2652 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2653 2654 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2655 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2656 2657 SourceLocation getRParenLoc() const { return RParenLoc; } 2658 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2659 2660 virtual SourceRange getSourceRange() const { 2661 return SourceRange(BuiltinLoc, RParenLoc); 2662 } 2663 static bool classof(const Stmt *T) { 2664 return T->getStmtClass() == ShuffleVectorExprClass; 2665 } 2666 static bool classof(const ShuffleVectorExpr *) { return true; } 2667 2668 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2669 /// constant expression, the actual arguments passed in, and the function 2670 /// pointers. 2671 unsigned getNumSubExprs() const { return NumExprs; } 2672 2673 /// getExpr - Return the Expr at the specified index. 2674 Expr *getExpr(unsigned Index) { 2675 assert((Index < NumExprs) && "Arg access out of range!"); 2676 return cast<Expr>(SubExprs[Index]); 2677 } 2678 const Expr *getExpr(unsigned Index) const { 2679 assert((Index < NumExprs) && "Arg access out of range!"); 2680 return cast<Expr>(SubExprs[Index]); 2681 } 2682 2683 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2684 2685 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2686 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2687 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2688 } 2689 2690 // Iterators 2691 virtual child_iterator child_begin(); 2692 virtual child_iterator child_end(); 2693}; 2694 2695/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2696/// This AST node is similar to the conditional operator (?:) in C, with 2697/// the following exceptions: 2698/// - the test expression must be a integer constant expression. 2699/// - the expression returned acts like the chosen subexpression in every 2700/// visible way: the type is the same as that of the chosen subexpression, 2701/// and all predicates (whether it's an l-value, whether it's an integer 2702/// constant expression, etc.) return the same result as for the chosen 2703/// sub-expression. 2704class ChooseExpr : public Expr { 2705 enum { COND, LHS, RHS, END_EXPR }; 2706 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2707 SourceLocation BuiltinLoc, RParenLoc; 2708public: 2709 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 2710 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2711 : Expr(ChooseExprClass, t, TypeDependent, ValueDependent), 2712 BuiltinLoc(BLoc), RParenLoc(RP) { 2713 SubExprs[COND] = cond; 2714 SubExprs[LHS] = lhs; 2715 SubExprs[RHS] = rhs; 2716 } 2717 2718 /// \brief Build an empty __builtin_choose_expr. 2719 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2720 2721 /// isConditionTrue - Return whether the condition is true (i.e. not 2722 /// equal to zero). 2723 bool isConditionTrue(ASTContext &C) const; 2724 2725 /// getChosenSubExpr - Return the subexpression chosen according to the 2726 /// condition. 2727 Expr *getChosenSubExpr(ASTContext &C) const { 2728 return isConditionTrue(C) ? getLHS() : getRHS(); 2729 } 2730 2731 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2732 void setCond(Expr *E) { SubExprs[COND] = E; } 2733 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2734 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2735 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2736 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2737 2738 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2739 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2740 2741 SourceLocation getRParenLoc() const { return RParenLoc; } 2742 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2743 2744 virtual SourceRange getSourceRange() const { 2745 return SourceRange(BuiltinLoc, RParenLoc); 2746 } 2747 static bool classof(const Stmt *T) { 2748 return T->getStmtClass() == ChooseExprClass; 2749 } 2750 static bool classof(const ChooseExpr *) { return true; } 2751 2752 // Iterators 2753 virtual child_iterator child_begin(); 2754 virtual child_iterator child_end(); 2755}; 2756 2757/// GNUNullExpr - Implements the GNU __null extension, which is a name 2758/// for a null pointer constant that has integral type (e.g., int or 2759/// long) and is the same size and alignment as a pointer. The __null 2760/// extension is typically only used by system headers, which define 2761/// NULL as __null in C++ rather than using 0 (which is an integer 2762/// that may not match the size of a pointer). 2763class GNUNullExpr : public Expr { 2764 /// TokenLoc - The location of the __null keyword. 2765 SourceLocation TokenLoc; 2766 2767public: 2768 GNUNullExpr(QualType Ty, SourceLocation Loc) 2769 : Expr(GNUNullExprClass, Ty, false, false), TokenLoc(Loc) { } 2770 2771 /// \brief Build an empty GNU __null expression. 2772 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2773 2774 /// getTokenLocation - The location of the __null token. 2775 SourceLocation getTokenLocation() const { return TokenLoc; } 2776 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2777 2778 virtual SourceRange getSourceRange() const { 2779 return SourceRange(TokenLoc); 2780 } 2781 static bool classof(const Stmt *T) { 2782 return T->getStmtClass() == GNUNullExprClass; 2783 } 2784 static bool classof(const GNUNullExpr *) { return true; } 2785 2786 // Iterators 2787 virtual child_iterator child_begin(); 2788 virtual child_iterator child_end(); 2789}; 2790 2791/// VAArgExpr, used for the builtin function __builtin_va_arg. 2792class VAArgExpr : public Expr { 2793 Stmt *Val; 2794 TypeSourceInfo *TInfo; 2795 SourceLocation BuiltinLoc, RParenLoc; 2796public: 2797 VAArgExpr(SourceLocation BLoc, Expr* e, TypeSourceInfo *TInfo, 2798 SourceLocation RPLoc, QualType t) 2799 : Expr(VAArgExprClass, t, t->isDependentType(), false), 2800 Val(e), TInfo(TInfo), 2801 BuiltinLoc(BLoc), 2802 RParenLoc(RPLoc) { } 2803 2804 /// \brief Create an empty __builtin_va_arg expression. 2805 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2806 2807 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2808 Expr *getSubExpr() { return cast<Expr>(Val); } 2809 void setSubExpr(Expr *E) { Val = E; } 2810 2811 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo; } 2812 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo = TI; } 2813 2814 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2815 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2816 2817 SourceLocation getRParenLoc() const { return RParenLoc; } 2818 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2819 2820 virtual SourceRange getSourceRange() const { 2821 return SourceRange(BuiltinLoc, RParenLoc); 2822 } 2823 static bool classof(const Stmt *T) { 2824 return T->getStmtClass() == VAArgExprClass; 2825 } 2826 static bool classof(const VAArgExpr *) { return true; } 2827 2828 // Iterators 2829 virtual child_iterator child_begin(); 2830 virtual child_iterator child_end(); 2831}; 2832 2833/// @brief Describes an C or C++ initializer list. 2834/// 2835/// InitListExpr describes an initializer list, which can be used to 2836/// initialize objects of different types, including 2837/// struct/class/union types, arrays, and vectors. For example: 2838/// 2839/// @code 2840/// struct foo x = { 1, { 2, 3 } }; 2841/// @endcode 2842/// 2843/// Prior to semantic analysis, an initializer list will represent the 2844/// initializer list as written by the user, but will have the 2845/// placeholder type "void". This initializer list is called the 2846/// syntactic form of the initializer, and may contain C99 designated 2847/// initializers (represented as DesignatedInitExprs), initializations 2848/// of subobject members without explicit braces, and so on. Clients 2849/// interested in the original syntax of the initializer list should 2850/// use the syntactic form of the initializer list. 2851/// 2852/// After semantic analysis, the initializer list will represent the 2853/// semantic form of the initializer, where the initializations of all 2854/// subobjects are made explicit with nested InitListExpr nodes and 2855/// C99 designators have been eliminated by placing the designated 2856/// initializations into the subobject they initialize. Additionally, 2857/// any "holes" in the initialization, where no initializer has been 2858/// specified for a particular subobject, will be replaced with 2859/// implicitly-generated ImplicitValueInitExpr expressions that 2860/// value-initialize the subobjects. Note, however, that the 2861/// initializer lists may still have fewer initializers than there are 2862/// elements to initialize within the object. 2863/// 2864/// Given the semantic form of the initializer list, one can retrieve 2865/// the original syntactic form of that initializer list (if it 2866/// exists) using getSyntacticForm(). Since many initializer lists 2867/// have the same syntactic and semantic forms, getSyntacticForm() may 2868/// return NULL, indicating that the current initializer list also 2869/// serves as its syntactic form. 2870class InitListExpr : public Expr { 2871 // FIXME: Eliminate this vector in favor of ASTContext allocation 2872 typedef ASTVector<Stmt *> InitExprsTy; 2873 InitExprsTy InitExprs; 2874 SourceLocation LBraceLoc, RBraceLoc; 2875 2876 /// Contains the initializer list that describes the syntactic form 2877 /// written in the source code. 2878 InitListExpr *SyntacticForm; 2879 2880 /// If this initializer list initializes a union, specifies which 2881 /// field within the union will be initialized. 2882 FieldDecl *UnionFieldInit; 2883 2884 /// Whether this initializer list originally had a GNU array-range 2885 /// designator in it. This is a temporary marker used by CodeGen. 2886 bool HadArrayRangeDesignator; 2887 2888public: 2889 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 2890 Expr **initexprs, unsigned numinits, 2891 SourceLocation rbraceloc); 2892 2893 /// \brief Build an empty initializer list. 2894 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 2895 : Expr(InitListExprClass, Empty), InitExprs(C) { } 2896 2897 unsigned getNumInits() const { return InitExprs.size(); } 2898 2899 const Expr *getInit(unsigned Init) const { 2900 assert(Init < getNumInits() && "Initializer access out of range!"); 2901 return cast_or_null<Expr>(InitExprs[Init]); 2902 } 2903 2904 Expr *getInit(unsigned Init) { 2905 assert(Init < getNumInits() && "Initializer access out of range!"); 2906 return cast_or_null<Expr>(InitExprs[Init]); 2907 } 2908 2909 void setInit(unsigned Init, Expr *expr) { 2910 assert(Init < getNumInits() && "Initializer access out of range!"); 2911 InitExprs[Init] = expr; 2912 } 2913 2914 /// \brief Reserve space for some number of initializers. 2915 void reserveInits(ASTContext &C, unsigned NumInits); 2916 2917 /// @brief Specify the number of initializers 2918 /// 2919 /// If there are more than @p NumInits initializers, the remaining 2920 /// initializers will be destroyed. If there are fewer than @p 2921 /// NumInits initializers, NULL expressions will be added for the 2922 /// unknown initializers. 2923 void resizeInits(ASTContext &Context, unsigned NumInits); 2924 2925 /// @brief Updates the initializer at index @p Init with the new 2926 /// expression @p expr, and returns the old expression at that 2927 /// location. 2928 /// 2929 /// When @p Init is out of range for this initializer list, the 2930 /// initializer list will be extended with NULL expressions to 2931 /// accomodate the new entry. 2932 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 2933 2934 /// \brief If this initializes a union, specifies which field in the 2935 /// union to initialize. 2936 /// 2937 /// Typically, this field is the first named field within the 2938 /// union. However, a designated initializer can specify the 2939 /// initialization of a different field within the union. 2940 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2941 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2942 2943 // Explicit InitListExpr's originate from source code (and have valid source 2944 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2945 bool isExplicit() { 2946 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2947 } 2948 2949 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2950 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2951 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2952 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2953 2954 /// @brief Retrieve the initializer list that describes the 2955 /// syntactic form of the initializer. 2956 /// 2957 /// 2958 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2959 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2960 2961 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2962 void sawArrayRangeDesignator(bool ARD = true) { 2963 HadArrayRangeDesignator = ARD; 2964 } 2965 2966 virtual SourceRange getSourceRange() const; 2967 2968 static bool classof(const Stmt *T) { 2969 return T->getStmtClass() == InitListExprClass; 2970 } 2971 static bool classof(const InitListExpr *) { return true; } 2972 2973 // Iterators 2974 virtual child_iterator child_begin(); 2975 virtual child_iterator child_end(); 2976 2977 typedef InitExprsTy::iterator iterator; 2978 typedef InitExprsTy::const_iterator const_iterator; 2979 typedef InitExprsTy::reverse_iterator reverse_iterator; 2980 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator; 2981 2982 iterator begin() { return InitExprs.begin(); } 2983 const_iterator begin() const { return InitExprs.begin(); } 2984 iterator end() { return InitExprs.end(); } 2985 const_iterator end() const { return InitExprs.end(); } 2986 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2987 const_reverse_iterator rbegin() const { return InitExprs.rbegin(); } 2988 reverse_iterator rend() { return InitExprs.rend(); } 2989 const_reverse_iterator rend() const { return InitExprs.rend(); } 2990}; 2991 2992/// @brief Represents a C99 designated initializer expression. 2993/// 2994/// A designated initializer expression (C99 6.7.8) contains one or 2995/// more designators (which can be field designators, array 2996/// designators, or GNU array-range designators) followed by an 2997/// expression that initializes the field or element(s) that the 2998/// designators refer to. For example, given: 2999/// 3000/// @code 3001/// struct point { 3002/// double x; 3003/// double y; 3004/// }; 3005/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 3006/// @endcode 3007/// 3008/// The InitListExpr contains three DesignatedInitExprs, the first of 3009/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 3010/// designators, one array designator for @c [2] followed by one field 3011/// designator for @c .y. The initalization expression will be 1.0. 3012class DesignatedInitExpr : public Expr { 3013public: 3014 /// \brief Forward declaration of the Designator class. 3015 class Designator; 3016 3017private: 3018 /// The location of the '=' or ':' prior to the actual initializer 3019 /// expression. 3020 SourceLocation EqualOrColonLoc; 3021 3022 /// Whether this designated initializer used the GNU deprecated 3023 /// syntax rather than the C99 '=' syntax. 3024 bool GNUSyntax : 1; 3025 3026 /// The number of designators in this initializer expression. 3027 unsigned NumDesignators : 15; 3028 3029 /// \brief The designators in this designated initialization 3030 /// expression. 3031 Designator *Designators; 3032 3033 /// The number of subexpressions of this initializer expression, 3034 /// which contains both the initializer and any additional 3035 /// expressions used by array and array-range designators. 3036 unsigned NumSubExprs : 16; 3037 3038 3039 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 3040 const Designator *Designators, 3041 SourceLocation EqualOrColonLoc, bool GNUSyntax, 3042 Expr **IndexExprs, unsigned NumIndexExprs, 3043 Expr *Init); 3044 3045 explicit DesignatedInitExpr(unsigned NumSubExprs) 3046 : Expr(DesignatedInitExprClass, EmptyShell()), 3047 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 3048 3049public: 3050 /// A field designator, e.g., ".x". 3051 struct FieldDesignator { 3052 /// Refers to the field that is being initialized. The low bit 3053 /// of this field determines whether this is actually a pointer 3054 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 3055 /// initially constructed, a field designator will store an 3056 /// IdentifierInfo*. After semantic analysis has resolved that 3057 /// name, the field designator will instead store a FieldDecl*. 3058 uintptr_t NameOrField; 3059 3060 /// The location of the '.' in the designated initializer. 3061 unsigned DotLoc; 3062 3063 /// The location of the field name in the designated initializer. 3064 unsigned FieldLoc; 3065 }; 3066 3067 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3068 struct ArrayOrRangeDesignator { 3069 /// Location of the first index expression within the designated 3070 /// initializer expression's list of subexpressions. 3071 unsigned Index; 3072 /// The location of the '[' starting the array range designator. 3073 unsigned LBracketLoc; 3074 /// The location of the ellipsis separating the start and end 3075 /// indices. Only valid for GNU array-range designators. 3076 unsigned EllipsisLoc; 3077 /// The location of the ']' terminating the array range designator. 3078 unsigned RBracketLoc; 3079 }; 3080 3081 /// @brief Represents a single C99 designator. 3082 /// 3083 /// @todo This class is infuriatingly similar to clang::Designator, 3084 /// but minor differences (storing indices vs. storing pointers) 3085 /// keep us from reusing it. Try harder, later, to rectify these 3086 /// differences. 3087 class Designator { 3088 /// @brief The kind of designator this describes. 3089 enum { 3090 FieldDesignator, 3091 ArrayDesignator, 3092 ArrayRangeDesignator 3093 } Kind; 3094 3095 union { 3096 /// A field designator, e.g., ".x". 3097 struct FieldDesignator Field; 3098 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 3099 struct ArrayOrRangeDesignator ArrayOrRange; 3100 }; 3101 friend class DesignatedInitExpr; 3102 3103 public: 3104 Designator() {} 3105 3106 /// @brief Initializes a field designator. 3107 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 3108 SourceLocation FieldLoc) 3109 : Kind(FieldDesignator) { 3110 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 3111 Field.DotLoc = DotLoc.getRawEncoding(); 3112 Field.FieldLoc = FieldLoc.getRawEncoding(); 3113 } 3114 3115 /// @brief Initializes an array designator. 3116 Designator(unsigned Index, SourceLocation LBracketLoc, 3117 SourceLocation RBracketLoc) 3118 : Kind(ArrayDesignator) { 3119 ArrayOrRange.Index = Index; 3120 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3121 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 3122 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3123 } 3124 3125 /// @brief Initializes a GNU array-range designator. 3126 Designator(unsigned Index, SourceLocation LBracketLoc, 3127 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 3128 : Kind(ArrayRangeDesignator) { 3129 ArrayOrRange.Index = Index; 3130 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 3131 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 3132 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 3133 } 3134 3135 bool isFieldDesignator() const { return Kind == FieldDesignator; } 3136 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 3137 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 3138 3139 IdentifierInfo * getFieldName(); 3140 3141 FieldDecl *getField() { 3142 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3143 if (Field.NameOrField & 0x01) 3144 return 0; 3145 else 3146 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 3147 } 3148 3149 void setField(FieldDecl *FD) { 3150 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3151 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 3152 } 3153 3154 SourceLocation getDotLoc() const { 3155 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3156 return SourceLocation::getFromRawEncoding(Field.DotLoc); 3157 } 3158 3159 SourceLocation getFieldLoc() const { 3160 assert(Kind == FieldDesignator && "Only valid on a field designator"); 3161 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 3162 } 3163 3164 SourceLocation getLBracketLoc() const { 3165 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3166 "Only valid on an array or array-range designator"); 3167 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 3168 } 3169 3170 SourceLocation getRBracketLoc() const { 3171 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3172 "Only valid on an array or array-range designator"); 3173 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 3174 } 3175 3176 SourceLocation getEllipsisLoc() const { 3177 assert(Kind == ArrayRangeDesignator && 3178 "Only valid on an array-range designator"); 3179 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 3180 } 3181 3182 unsigned getFirstExprIndex() const { 3183 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 3184 "Only valid on an array or array-range designator"); 3185 return ArrayOrRange.Index; 3186 } 3187 3188 SourceLocation getStartLocation() const { 3189 if (Kind == FieldDesignator) 3190 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 3191 else 3192 return getLBracketLoc(); 3193 } 3194 }; 3195 3196 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 3197 unsigned NumDesignators, 3198 Expr **IndexExprs, unsigned NumIndexExprs, 3199 SourceLocation EqualOrColonLoc, 3200 bool GNUSyntax, Expr *Init); 3201 3202 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 3203 3204 /// @brief Returns the number of designators in this initializer. 3205 unsigned size() const { return NumDesignators; } 3206 3207 // Iterator access to the designators. 3208 typedef Designator* designators_iterator; 3209 designators_iterator designators_begin() { return Designators; } 3210 designators_iterator designators_end() { 3211 return Designators + NumDesignators; 3212 } 3213 3214 typedef std::reverse_iterator<designators_iterator> 3215 reverse_designators_iterator; 3216 reverse_designators_iterator designators_rbegin() { 3217 return reverse_designators_iterator(designators_end()); 3218 } 3219 reverse_designators_iterator designators_rend() { 3220 return reverse_designators_iterator(designators_begin()); 3221 } 3222 3223 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 3224 3225 void setDesignators(ASTContext &C, const Designator *Desigs, 3226 unsigned NumDesigs); 3227 3228 Expr *getArrayIndex(const Designator& D); 3229 Expr *getArrayRangeStart(const Designator& D); 3230 Expr *getArrayRangeEnd(const Designator& D); 3231 3232 /// @brief Retrieve the location of the '=' that precedes the 3233 /// initializer value itself, if present. 3234 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 3235 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 3236 3237 /// @brief Determines whether this designated initializer used the 3238 /// deprecated GNU syntax for designated initializers. 3239 bool usesGNUSyntax() const { return GNUSyntax; } 3240 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 3241 3242 /// @brief Retrieve the initializer value. 3243 Expr *getInit() const { 3244 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 3245 } 3246 3247 void setInit(Expr *init) { 3248 *child_begin() = init; 3249 } 3250 3251 /// \brief Retrieve the total number of subexpressions in this 3252 /// designated initializer expression, including the actual 3253 /// initialized value and any expressions that occur within array 3254 /// and array-range designators. 3255 unsigned getNumSubExprs() const { return NumSubExprs; } 3256 3257 Expr *getSubExpr(unsigned Idx) { 3258 assert(Idx < NumSubExprs && "Subscript out of range"); 3259 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3260 Ptr += sizeof(DesignatedInitExpr); 3261 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 3262 } 3263 3264 void setSubExpr(unsigned Idx, Expr *E) { 3265 assert(Idx < NumSubExprs && "Subscript out of range"); 3266 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 3267 Ptr += sizeof(DesignatedInitExpr); 3268 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 3269 } 3270 3271 /// \brief Replaces the designator at index @p Idx with the series 3272 /// of designators in [First, Last). 3273 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 3274 const Designator *Last); 3275 3276 virtual SourceRange getSourceRange() const; 3277 3278 static bool classof(const Stmt *T) { 3279 return T->getStmtClass() == DesignatedInitExprClass; 3280 } 3281 static bool classof(const DesignatedInitExpr *) { return true; } 3282 3283 // Iterators 3284 virtual child_iterator child_begin(); 3285 virtual child_iterator child_end(); 3286}; 3287 3288/// \brief Represents an implicitly-generated value initialization of 3289/// an object of a given type. 3290/// 3291/// Implicit value initializations occur within semantic initializer 3292/// list expressions (InitListExpr) as placeholders for subobject 3293/// initializations not explicitly specified by the user. 3294/// 3295/// \see InitListExpr 3296class ImplicitValueInitExpr : public Expr { 3297public: 3298 explicit ImplicitValueInitExpr(QualType ty) 3299 : Expr(ImplicitValueInitExprClass, ty, false, false) { } 3300 3301 /// \brief Construct an empty implicit value initialization. 3302 explicit ImplicitValueInitExpr(EmptyShell Empty) 3303 : Expr(ImplicitValueInitExprClass, Empty) { } 3304 3305 static bool classof(const Stmt *T) { 3306 return T->getStmtClass() == ImplicitValueInitExprClass; 3307 } 3308 static bool classof(const ImplicitValueInitExpr *) { return true; } 3309 3310 virtual SourceRange getSourceRange() const { 3311 return SourceRange(); 3312 } 3313 3314 // Iterators 3315 virtual child_iterator child_begin(); 3316 virtual child_iterator child_end(); 3317}; 3318 3319 3320class ParenListExpr : public Expr { 3321 Stmt **Exprs; 3322 unsigned NumExprs; 3323 SourceLocation LParenLoc, RParenLoc; 3324 3325public: 3326 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 3327 unsigned numexprs, SourceLocation rparenloc); 3328 3329 /// \brief Build an empty paren list. 3330 explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 3331 3332 unsigned getNumExprs() const { return NumExprs; } 3333 3334 const Expr* getExpr(unsigned Init) const { 3335 assert(Init < getNumExprs() && "Initializer access out of range!"); 3336 return cast_or_null<Expr>(Exprs[Init]); 3337 } 3338 3339 Expr* getExpr(unsigned Init) { 3340 assert(Init < getNumExprs() && "Initializer access out of range!"); 3341 return cast_or_null<Expr>(Exprs[Init]); 3342 } 3343 3344 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 3345 3346 SourceLocation getLParenLoc() const { return LParenLoc; } 3347 SourceLocation getRParenLoc() const { return RParenLoc; } 3348 3349 virtual SourceRange getSourceRange() const { 3350 return SourceRange(LParenLoc, RParenLoc); 3351 } 3352 static bool classof(const Stmt *T) { 3353 return T->getStmtClass() == ParenListExprClass; 3354 } 3355 static bool classof(const ParenListExpr *) { return true; } 3356 3357 // Iterators 3358 virtual child_iterator child_begin(); 3359 virtual child_iterator child_end(); 3360 3361 friend class ASTStmtReader; 3362 friend class ASTStmtWriter; 3363}; 3364 3365 3366//===----------------------------------------------------------------------===// 3367// Clang Extensions 3368//===----------------------------------------------------------------------===// 3369 3370 3371/// ExtVectorElementExpr - This represents access to specific elements of a 3372/// vector, and may occur on the left hand side or right hand side. For example 3373/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3374/// 3375/// Note that the base may have either vector or pointer to vector type, just 3376/// like a struct field reference. 3377/// 3378class ExtVectorElementExpr : public Expr { 3379 Stmt *Base; 3380 IdentifierInfo *Accessor; 3381 SourceLocation AccessorLoc; 3382public: 3383 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 3384 SourceLocation loc) 3385 : Expr(ExtVectorElementExprClass, ty, base->isTypeDependent(), 3386 base->isValueDependent()), 3387 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3388 3389 /// \brief Build an empty vector element expression. 3390 explicit ExtVectorElementExpr(EmptyShell Empty) 3391 : Expr(ExtVectorElementExprClass, Empty) { } 3392 3393 const Expr *getBase() const { return cast<Expr>(Base); } 3394 Expr *getBase() { return cast<Expr>(Base); } 3395 void setBase(Expr *E) { Base = E; } 3396 3397 IdentifierInfo &getAccessor() const { return *Accessor; } 3398 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3399 3400 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3401 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3402 3403 /// getNumElements - Get the number of components being selected. 3404 unsigned getNumElements() const; 3405 3406 /// containsDuplicateElements - Return true if any element access is 3407 /// repeated. 3408 bool containsDuplicateElements() const; 3409 3410 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3411 /// aggregate Constant of ConstantInt(s). 3412 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3413 3414 virtual SourceRange getSourceRange() const { 3415 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3416 } 3417 3418 /// isArrow - Return true if the base expression is a pointer to vector, 3419 /// return false if the base expression is a vector. 3420 bool isArrow() const; 3421 3422 static bool classof(const Stmt *T) { 3423 return T->getStmtClass() == ExtVectorElementExprClass; 3424 } 3425 static bool classof(const ExtVectorElementExpr *) { return true; } 3426 3427 // Iterators 3428 virtual child_iterator child_begin(); 3429 virtual child_iterator child_end(); 3430}; 3431 3432 3433/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3434/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3435class BlockExpr : public Expr { 3436protected: 3437 BlockDecl *TheBlock; 3438 bool HasBlockDeclRefExprs; 3439public: 3440 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 3441 : Expr(BlockExprClass, ty, ty->isDependentType(), false), 3442 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 3443 3444 /// \brief Build an empty block expression. 3445 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3446 3447 const BlockDecl *getBlockDecl() const { return TheBlock; } 3448 BlockDecl *getBlockDecl() { return TheBlock; } 3449 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3450 3451 // Convenience functions for probing the underlying BlockDecl. 3452 SourceLocation getCaretLocation() const; 3453 const Stmt *getBody() const; 3454 Stmt *getBody(); 3455 3456 virtual SourceRange getSourceRange() const { 3457 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3458 } 3459 3460 /// getFunctionType - Return the underlying function type for this block. 3461 const FunctionType *getFunctionType() const; 3462 3463 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 3464 /// inside of the block that reference values outside the block. 3465 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 3466 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 3467 3468 static bool classof(const Stmt *T) { 3469 return T->getStmtClass() == BlockExprClass; 3470 } 3471 static bool classof(const BlockExpr *) { return true; } 3472 3473 // Iterators 3474 virtual child_iterator child_begin(); 3475 virtual child_iterator child_end(); 3476}; 3477 3478/// BlockDeclRefExpr - A reference to a declared variable, function, 3479/// enum, etc. 3480class BlockDeclRefExpr : public Expr { 3481 ValueDecl *D; 3482 SourceLocation Loc; 3483 bool IsByRef : 1; 3484 bool ConstQualAdded : 1; 3485 Stmt *CopyConstructorVal; 3486public: 3487 // FIXME: Fix type/value dependence! 3488 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 3489 bool constAdded = false, 3490 Stmt *copyConstructorVal = 0) 3491 : Expr(BlockDeclRefExprClass, t, (!t.isNull() && t->isDependentType()),false), 3492 D(d), Loc(l), IsByRef(ByRef), 3493 ConstQualAdded(constAdded), CopyConstructorVal(copyConstructorVal) {} 3494 3495 // \brief Build an empty reference to a declared variable in a 3496 // block. 3497 explicit BlockDeclRefExpr(EmptyShell Empty) 3498 : Expr(BlockDeclRefExprClass, Empty) { } 3499 3500 ValueDecl *getDecl() { return D; } 3501 const ValueDecl *getDecl() const { return D; } 3502 void setDecl(ValueDecl *VD) { D = VD; } 3503 3504 SourceLocation getLocation() const { return Loc; } 3505 void setLocation(SourceLocation L) { Loc = L; } 3506 3507 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 3508 3509 bool isByRef() const { return IsByRef; } 3510 void setByRef(bool BR) { IsByRef = BR; } 3511 3512 bool isConstQualAdded() const { return ConstQualAdded; } 3513 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3514 3515 const Expr *getCopyConstructorExpr() const 3516 { return cast_or_null<Expr>(CopyConstructorVal); } 3517 Expr *getCopyConstructorExpr() 3518 { return cast_or_null<Expr>(CopyConstructorVal); } 3519 void setCopyConstructorExpr(Expr *E) { CopyConstructorVal = E; } 3520 3521 static bool classof(const Stmt *T) { 3522 return T->getStmtClass() == BlockDeclRefExprClass; 3523 } 3524 static bool classof(const BlockDeclRefExpr *) { return true; } 3525 3526 // Iterators 3527 virtual child_iterator child_begin(); 3528 virtual child_iterator child_end(); 3529}; 3530 3531/// OpaqueValueExpr - An expression referring to an opaque object of a 3532/// fixed type and value class. These don't correspond to concrete 3533/// syntax; instead they're used to express operations (usually copy 3534/// operations) on values whose source is generally obvious from 3535/// context. 3536class OpaqueValueExpr : public Expr { 3537 friend class ASTStmtReader; 3538public: 3539 OpaqueValueExpr(QualType T, ExprValueKind VK) 3540 : Expr(OpaqueValueExprClass, T, T->isDependentType(), 3541 T->isDependentType()) { 3542 setValueKind(VK); 3543 } 3544 3545 explicit OpaqueValueExpr(EmptyShell Empty) 3546 : Expr(OpaqueValueExprClass, Empty) { } 3547 3548 using Expr::getValueKind; 3549 3550 virtual SourceRange getSourceRange() const; 3551 virtual child_iterator child_begin(); 3552 virtual child_iterator child_end(); 3553 3554 static bool classof(const Stmt *T) { 3555 return T->getStmtClass() == OpaqueValueExprClass; 3556 } 3557 static bool classof(const OpaqueValueExpr *) { return true; } 3558}; 3559 3560} // end namespace clang 3561 3562#endif 3563