Expr.h revision db600c330a37b1c3ab4533310729910ee188f900
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 "llvm/ADT/APSInt.h" 21#include "llvm/ADT/APFloat.h" 22#include "llvm/ADT/SmallVector.h" 23#include <vector> 24 25namespace clang { 26 class ASTContext; 27 class APValue; 28 class Decl; 29 class IdentifierInfo; 30 class ParmVarDecl; 31 class NamedDecl; 32 class ValueDecl; 33 class BlockDecl; 34 class CXXOperatorCallExpr; 35 class CXXMemberCallExpr; 36 37/// Expr - This represents one expression. Note that Expr's are subclasses of 38/// Stmt. This allows an expression to be transparently used any place a Stmt 39/// is required. 40/// 41class Expr : public Stmt { 42 QualType TR; 43 44 /// TypeDependent - Whether this expression is type-dependent 45 /// (C++ [temp.dep.expr]). 46 bool TypeDependent : 1; 47 48 /// ValueDependent - Whether this expression is value-dependent 49 /// (C++ [temp.dep.constexpr]). 50 bool ValueDependent : 1; 51 52protected: 53 // FIXME: Eventually, this constructor should go away and we should 54 // require every subclass to provide type/value-dependence 55 // information. 56 Expr(StmtClass SC, QualType T) 57 : Stmt(SC), TypeDependent(false), ValueDependent(false) { 58 setType(T); 59 } 60 61 Expr(StmtClass SC, QualType T, bool TD, bool VD) 62 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 63 setType(T); 64 } 65 66 /// \brief Construct an empty expression. 67 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 68 69public: 70 QualType getType() const { return TR; } 71 void setType(QualType t) { 72 // In C++, the type of an expression is always adjusted so that it 73 // will not have reference type an expression will never have 74 // reference type (C++ [expr]p6). Use 75 // QualType::getNonReferenceType() to retrieve the non-reference 76 // type. Additionally, inspect Expr::isLvalue to determine whether 77 // an expression that is adjusted in this manner should be 78 // considered an lvalue. 79 assert((TR.isNull() || !TR->isReferenceType()) && 80 "Expressions can't have reference type"); 81 82 TR = t; 83 } 84 85 /// isValueDependent - Determines whether this expression is 86 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 87 /// array bound of "Chars" in the following example is 88 /// value-dependent. 89 /// @code 90 /// template<int Size, char (&Chars)[Size]> struct meta_string; 91 /// @endcode 92 bool isValueDependent() const { return ValueDependent; } 93 94 /// \brief Set whether this expression is value-dependent or not. 95 void setValueDependent(bool VD) { ValueDependent = VD; } 96 97 /// isTypeDependent - Determines whether this expression is 98 /// type-dependent (C++ [temp.dep.expr]), which means that its type 99 /// could change from one template instantiation to the next. For 100 /// example, the expressions "x" and "x + y" are type-dependent in 101 /// the following code, but "y" is not type-dependent: 102 /// @code 103 /// template<typename T> 104 /// void add(T x, int y) { 105 /// x + y; 106 /// } 107 /// @endcode 108 bool isTypeDependent() const { return TypeDependent; } 109 110 /// \brief Set whether this expression is type-dependent or not. 111 void setTypeDependent(bool TD) { TypeDependent = TD; } 112 113 /// SourceLocation tokens are not useful in isolation - they are low level 114 /// value objects created/interpreted by SourceManager. We assume AST 115 /// clients will have a pointer to the respective SourceManager. 116 virtual SourceRange getSourceRange() const = 0; 117 118 /// getExprLoc - Return the preferred location for the arrow when diagnosing 119 /// a problem with a generic expression. 120 virtual SourceLocation getExprLoc() const { return getLocStart(); } 121 122 /// isUnusedResultAWarning - Return true if this immediate expression should 123 /// be warned about if the result is unused. If so, fill in Loc and Ranges 124 /// with location to warn on and the source range[s] to report with the 125 /// warning. 126 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 127 SourceRange &R2) const; 128 129 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 130 /// incomplete type other than void. Nonarray expressions that can be lvalues: 131 /// - name, where name must be a variable 132 /// - e[i] 133 /// - (e), where e must be an lvalue 134 /// - e.name, where e must be an lvalue 135 /// - e->name 136 /// - *e, the type of e cannot be a function type 137 /// - string-constant 138 /// - reference type [C++ [expr]] 139 /// 140 enum isLvalueResult { 141 LV_Valid, 142 LV_NotObjectType, 143 LV_IncompleteVoidType, 144 LV_DuplicateVectorComponents, 145 LV_InvalidExpression, 146 LV_MemberFunction 147 }; 148 isLvalueResult isLvalue(ASTContext &Ctx) const; 149 150 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 151 /// does not have an incomplete type, does not have a const-qualified type, 152 /// and if it is a structure or union, does not have any member (including, 153 /// recursively, any member or element of all contained aggregates or unions) 154 /// with a const-qualified type. 155 /// 156 /// \param Loc [in] [out] - A source location which *may* be filled 157 /// in with the location of the expression making this a 158 /// non-modifiable lvalue, if specified. 159 enum isModifiableLvalueResult { 160 MLV_Valid, 161 MLV_NotObjectType, 162 MLV_IncompleteVoidType, 163 MLV_DuplicateVectorComponents, 164 MLV_InvalidExpression, 165 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 166 MLV_IncompleteType, 167 MLV_ConstQualified, 168 MLV_ArrayType, 169 MLV_NotBlockQualified, 170 MLV_ReadonlyProperty, 171 MLV_NoSetterProperty, 172 MLV_MemberFunction 173 }; 174 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 175 SourceLocation *Loc = 0) const; 176 177 bool isBitField(); 178 179 /// getIntegerConstantExprValue() - Return the value of an integer 180 /// constant expression. The expression must be a valid integer 181 /// constant expression as determined by isIntegerConstantExpr. 182 llvm::APSInt getIntegerConstantExprValue(ASTContext &Ctx) const { 183 llvm::APSInt X; 184 bool success = isIntegerConstantExpr(X, Ctx); 185 success = success; 186 assert(success && "Illegal argument to getIntegerConstantExpr"); 187 return X; 188 } 189 190 /// isIntegerConstantExpr - Return true if this expression is a valid integer 191 /// constant expression, and, if so, return its value in Result. If not a 192 /// valid i-c-e, return false and fill in Loc (if specified) with the location 193 /// of the invalid expression. 194 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 195 SourceLocation *Loc = 0, 196 bool isEvaluated = true) const; 197 bool isIntegerConstantExprInternal(llvm::APSInt &Result, ASTContext &Ctx, 198 SourceLocation *Loc = 0, 199 bool isEvaluated = true) const; 200 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 201 llvm::APSInt X; 202 return isIntegerConstantExpr(X, Ctx, Loc); 203 } 204 /// isConstantInitializer - Returns true if this expression is a constant 205 /// initializer, which can be emitted at compile-time. 206 bool isConstantInitializer(ASTContext &Ctx) const; 207 208 /// EvalResult is a struct with detailed info about an evaluated expression. 209 struct EvalResult { 210 /// Val - This is the value the expression can be folded to. 211 APValue Val; 212 213 /// HasSideEffects - Whether the evaluated expression has side effects. 214 /// For example, (f() && 0) can be folded, but it still has side effects. 215 bool HasSideEffects; 216 217 /// Diag - If the expression is unfoldable, then Diag contains a note 218 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 219 /// position for the error, and DiagExpr is the expression that caused 220 /// the error. 221 /// If the expression is foldable, but not an integer constant expression, 222 /// Diag contains a note diagnostic that describes why it isn't an integer 223 /// constant expression. If the expression *is* an integer constant 224 /// expression, then Diag will be zero. 225 unsigned Diag; 226 const Expr *DiagExpr; 227 SourceLocation DiagLoc; 228 229 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 230 }; 231 232 /// Evaluate - Return true if this is a constant which we can fold using 233 /// any crazy technique (that has nothing to do with language standards) that 234 /// we want to. If this function returns true, it returns the folded constant 235 /// in Result. 236 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 237 238 /// isEvaluatable - Call Evaluate to see if this expression can be constant 239 /// folded, but discard the result. 240 bool isEvaluatable(ASTContext &Ctx) const; 241 242 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 243 /// must be called on an expression that constant folds to an integer. 244 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 245 246 /// EvaluateAsLValue - Evaluate an expression to see if it's a valid LValue. 247 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 248 249 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 250 /// integer constant expression with the value zero, or if this is one that is 251 /// cast to void*. 252 bool isNullPointerConstant(ASTContext &Ctx) const; 253 254 /// hasGlobalStorage - Return true if this expression has static storage 255 /// duration. This means that the address of this expression is a link-time 256 /// constant. 257 bool hasGlobalStorage() const; 258 259 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 260 /// write barrier. 261 bool isOBJCGCCandidate() const; 262 263 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 264 /// its subexpression. If that subexpression is also a ParenExpr, 265 /// then this method recursively returns its subexpression, and so forth. 266 /// Otherwise, the method returns the current Expr. 267 Expr* IgnoreParens(); 268 269 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 270 /// or CastExprs, returning their operand. 271 Expr *IgnoreParenCasts(); 272 273 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 274 /// value (including ptr->int casts of the same size). Strip off any 275 /// ParenExpr or CastExprs, returning their operand. 276 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 277 278 const Expr* IgnoreParens() const { 279 return const_cast<Expr*>(this)->IgnoreParens(); 280 } 281 const Expr *IgnoreParenCasts() const { 282 return const_cast<Expr*>(this)->IgnoreParenCasts(); 283 } 284 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 285 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 286 } 287 288 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 289 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 290 291 static bool classof(const Stmt *T) { 292 return T->getStmtClass() >= firstExprConstant && 293 T->getStmtClass() <= lastExprConstant; 294 } 295 static bool classof(const Expr *) { return true; } 296 297 static inline Expr* Create(llvm::Deserializer& D, ASTContext& C) { 298 return cast<Expr>(Stmt::Create(D, C)); 299 } 300}; 301 302 303//===----------------------------------------------------------------------===// 304// Primary Expressions. 305//===----------------------------------------------------------------------===// 306 307/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 308/// enum, etc. 309class DeclRefExpr : public Expr { 310 NamedDecl *D; 311 SourceLocation Loc; 312 313protected: 314 // FIXME: Eventually, this constructor will go away and all subclasses 315 // will have to provide the type- and value-dependent flags. 316 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 317 Expr(SC, t), D(d), Loc(l) {} 318 319 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 320 bool VD) : 321 Expr(SC, t, TD, VD), D(d), Loc(l) {} 322 323public: 324 // FIXME: Eventually, this constructor will go away and all clients 325 // will have to provide the type- and value-dependent flags. 326 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 327 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 328 329 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 330 Expr(DeclRefExprClass, t, TD, VD), D(d), Loc(l) {} 331 332 /// \brief Construct an empty declaration reference expression. 333 explicit DeclRefExpr(EmptyShell Empty) 334 : Expr(DeclRefExprClass, Empty) { } 335 336 NamedDecl *getDecl() { return D; } 337 const NamedDecl *getDecl() const { return D; } 338 void setDecl(NamedDecl *NewD) { D = NewD; } 339 340 SourceLocation getLocation() const { return Loc; } 341 void setLocation(SourceLocation L) { Loc = L; } 342 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 343 344 static bool classof(const Stmt *T) { 345 return T->getStmtClass() == DeclRefExprClass || 346 T->getStmtClass() == CXXConditionDeclExprClass || 347 T->getStmtClass() == QualifiedDeclRefExprClass; 348 } 349 static bool classof(const DeclRefExpr *) { return true; } 350 351 // Iterators 352 virtual child_iterator child_begin(); 353 virtual child_iterator child_end(); 354 355 virtual void EmitImpl(llvm::Serializer& S) const; 356 static DeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 357}; 358 359/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 360class PredefinedExpr : public Expr { 361public: 362 enum IdentType { 363 Func, 364 Function, 365 PrettyFunction 366 }; 367 368private: 369 SourceLocation Loc; 370 IdentType Type; 371public: 372 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 373 : Expr(PredefinedExprClass, type), Loc(l), Type(IT) {} 374 375 /// \brief Construct an empty predefined expression. 376 explicit PredefinedExpr(EmptyShell Empty) 377 : Expr(PredefinedExprClass, Empty) { } 378 379 IdentType getIdentType() const { return Type; } 380 void setIdentType(IdentType IT) { Type = IT; } 381 382 SourceLocation getLocation() const { return Loc; } 383 void setLocation(SourceLocation L) { Loc = L; } 384 385 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 386 387 static bool classof(const Stmt *T) { 388 return T->getStmtClass() == PredefinedExprClass; 389 } 390 static bool classof(const PredefinedExpr *) { return true; } 391 392 // Iterators 393 virtual child_iterator child_begin(); 394 virtual child_iterator child_end(); 395 396 virtual void EmitImpl(llvm::Serializer& S) const; 397 static PredefinedExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 398}; 399 400class IntegerLiteral : public Expr { 401 llvm::APInt Value; 402 SourceLocation Loc; 403public: 404 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 405 // or UnsignedLongLongTy 406 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 407 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 408 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 409 } 410 411 /// \brief Construct an empty integer literal. 412 explicit IntegerLiteral(EmptyShell Empty) 413 : Expr(IntegerLiteralClass, Empty) { } 414 415 IntegerLiteral* Clone(ASTContext &C) const; 416 417 const llvm::APInt &getValue() const { return Value; } 418 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 419 420 /// \brief Retrieve the location of the literal. 421 SourceLocation getLocation() const { return Loc; } 422 423 void setValue(const llvm::APInt &Val) { Value = Val; } 424 void setLocation(SourceLocation Location) { Loc = Location; } 425 426 static bool classof(const Stmt *T) { 427 return T->getStmtClass() == IntegerLiteralClass; 428 } 429 static bool classof(const IntegerLiteral *) { return true; } 430 431 // Iterators 432 virtual child_iterator child_begin(); 433 virtual child_iterator child_end(); 434 435 virtual void EmitImpl(llvm::Serializer& S) const; 436 static IntegerLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 437}; 438 439class CharacterLiteral : public Expr { 440 unsigned Value; 441 SourceLocation Loc; 442 bool IsWide; 443public: 444 // type should be IntTy 445 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 446 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 447 } 448 449 /// \brief Construct an empty character literal. 450 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 451 452 SourceLocation getLoc() const { return Loc; } 453 bool isWide() const { return IsWide; } 454 455 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 456 457 unsigned getValue() const { return Value; } 458 459 void setLocation(SourceLocation Location) { Loc = Location; } 460 void setWide(bool W) { IsWide = W; } 461 void setValue(unsigned Val) { Value = Val; } 462 463 static bool classof(const Stmt *T) { 464 return T->getStmtClass() == CharacterLiteralClass; 465 } 466 static bool classof(const CharacterLiteral *) { return true; } 467 468 // Iterators 469 virtual child_iterator child_begin(); 470 virtual child_iterator child_end(); 471 472 virtual void EmitImpl(llvm::Serializer& S) const; 473 static CharacterLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 474}; 475 476class FloatingLiteral : public Expr { 477 llvm::APFloat Value; 478 bool IsExact : 1; 479 SourceLocation Loc; 480public: 481 FloatingLiteral(const llvm::APFloat &V, bool* isexact, 482 QualType Type, SourceLocation L) 483 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(*isexact), Loc(L) {} 484 485 /// \brief Construct an empty floating-point literal. 486 FloatingLiteral(EmptyShell Empty) 487 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 488 489 const llvm::APFloat &getValue() const { return Value; } 490 void setValue(const llvm::APFloat &Val) { Value = Val; } 491 492 bool isExact() const { return IsExact; } 493 void setExact(bool E) { IsExact = E; } 494 495 /// getValueAsApproximateDouble - This returns the value as an inaccurate 496 /// double. Note that this may cause loss of precision, but is useful for 497 /// debugging dumps, etc. 498 double getValueAsApproximateDouble() const; 499 500 SourceLocation getLocation() const { return Loc; } 501 void setLocation(SourceLocation L) { Loc = L; } 502 503 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 504 505 static bool classof(const Stmt *T) { 506 return T->getStmtClass() == FloatingLiteralClass; 507 } 508 static bool classof(const FloatingLiteral *) { return true; } 509 510 // Iterators 511 virtual child_iterator child_begin(); 512 virtual child_iterator child_end(); 513 514 virtual void EmitImpl(llvm::Serializer& S) const; 515 static FloatingLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 516}; 517 518/// ImaginaryLiteral - We support imaginary integer and floating point literals, 519/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 520/// IntegerLiteral classes. Instances of this class always have a Complex type 521/// whose element type matches the subexpression. 522/// 523class ImaginaryLiteral : public Expr { 524 Stmt *Val; 525public: 526 ImaginaryLiteral(Expr *val, QualType Ty) 527 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 528 529 const Expr *getSubExpr() const { return cast<Expr>(Val); } 530 Expr *getSubExpr() { return cast<Expr>(Val); } 531 532 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 533 static bool classof(const Stmt *T) { 534 return T->getStmtClass() == ImaginaryLiteralClass; 535 } 536 static bool classof(const ImaginaryLiteral *) { return true; } 537 538 // Iterators 539 virtual child_iterator child_begin(); 540 virtual child_iterator child_end(); 541 542 virtual void EmitImpl(llvm::Serializer& S) const; 543 static ImaginaryLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 544}; 545 546/// StringLiteral - This represents a string literal expression, e.g. "foo" 547/// or L"bar" (wide strings). The actual string is returned by getStrData() 548/// is NOT null-terminated, and the length of the string is determined by 549/// calling getByteLength(). The C type for a string is always a 550/// ConstantArrayType. In C++, the char type is const qualified, in C it is 551/// not. 552/// 553/// Note that strings in C can be formed by concatenation of multiple string 554/// literal pptokens in translation phase #6. This keeps track of the locations 555/// of each of these pieces. 556/// 557/// Strings in C can also be truncated and extended by assigning into arrays, 558/// e.g. with constructs like: 559/// char X[2] = "foobar"; 560/// In this case, getByteLength() will return 6, but the string literal will 561/// have type "char[2]". 562class StringLiteral : public Expr { 563 const char *StrData; 564 unsigned ByteLength; 565 bool IsWide; 566 unsigned NumConcatenated; 567 SourceLocation TokLocs[1]; 568 569 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 570public: 571 /// This is the "fully general" constructor that allows representation of 572 /// strings formed from multiple concatenated tokens. 573 static StringLiteral *Create(ASTContext &C, const char *StrData, 574 unsigned ByteLength, bool Wide, QualType Ty, 575 const SourceLocation *Loc, unsigned NumStrs); 576 577 /// Simple constructor for string literals made from one token. 578 static StringLiteral *Create(ASTContext &C, const char *StrData, 579 unsigned ByteLength, 580 bool Wide, QualType Ty, SourceLocation Loc) { 581 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 582 } 583 584 StringLiteral* Clone(ASTContext &C) const; 585 void Destroy(ASTContext &C); 586 587 const char *getStrData() const { return StrData; } 588 unsigned getByteLength() const { return ByteLength; } 589 bool isWide() const { return IsWide; } 590 bool containsNonAsciiOrNull() const { 591 for (unsigned i = 0; i < getByteLength(); ++i) 592 if (!isascii(getStrData()[i]) || !getStrData()[i]) 593 return true; 594 return false; 595 } 596 /// getNumConcatenated - Get the number of string literal tokens that were 597 /// concatenated in translation phase #6 to form this string literal. 598 unsigned getNumConcatenated() const { return NumConcatenated; } 599 600 SourceLocation getStrTokenLoc(unsigned TokNum) const { 601 assert(TokNum < NumConcatenated && "Invalid tok number"); 602 return TokLocs[TokNum]; 603 } 604 605 typedef const SourceLocation *tokloc_iterator; 606 tokloc_iterator tokloc_begin() const { return TokLocs; } 607 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 608 609 virtual SourceRange getSourceRange() const { 610 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 611 } 612 static bool classof(const Stmt *T) { 613 return T->getStmtClass() == StringLiteralClass; 614 } 615 static bool classof(const StringLiteral *) { return true; } 616 617 // Iterators 618 virtual child_iterator child_begin(); 619 virtual child_iterator child_end(); 620 621 virtual void EmitImpl(llvm::Serializer& S) const; 622 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 623}; 624 625/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 626/// AST node is only formed if full location information is requested. 627class ParenExpr : public Expr { 628 SourceLocation L, R; 629 Stmt *Val; 630public: 631 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 632 : Expr(ParenExprClass, val->getType(), 633 val->isTypeDependent(), val->isValueDependent()), 634 L(l), R(r), Val(val) {} 635 636 /// \brief Construct an empty parenthesized expression. 637 explicit ParenExpr(EmptyShell Empty) 638 : Expr(ParenExprClass, Empty) { } 639 640 const Expr *getSubExpr() const { return cast<Expr>(Val); } 641 Expr *getSubExpr() { return cast<Expr>(Val); } 642 void setSubExpr(Expr *E) { Val = E; } 643 644 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 645 646 /// \brief Get the location of the left parentheses '('. 647 SourceLocation getLParen() const { return L; } 648 void setLParen(SourceLocation Loc) { L = Loc; } 649 650 /// \brief Get the location of the right parentheses ')'. 651 SourceLocation getRParen() const { return R; } 652 void setRParen(SourceLocation Loc) { R = Loc; } 653 654 static bool classof(const Stmt *T) { 655 return T->getStmtClass() == ParenExprClass; 656 } 657 static bool classof(const ParenExpr *) { return true; } 658 659 // Iterators 660 virtual child_iterator child_begin(); 661 virtual child_iterator child_end(); 662 663 virtual void EmitImpl(llvm::Serializer& S) const; 664 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 665}; 666 667 668/// UnaryOperator - This represents the unary-expression's (except sizeof and 669/// alignof), the postinc/postdec operators from postfix-expression, and various 670/// extensions. 671/// 672/// Notes on various nodes: 673/// 674/// Real/Imag - These return the real/imag part of a complex operand. If 675/// applied to a non-complex value, the former returns its operand and the 676/// later returns zero in the type of the operand. 677/// 678/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 679/// subexpression is a compound literal with the various MemberExpr and 680/// ArraySubscriptExpr's applied to it. 681/// 682class UnaryOperator : public Expr { 683public: 684 // Note that additions to this should also update the StmtVisitor class. 685 enum Opcode { 686 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 687 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 688 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 689 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 690 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 691 Real, Imag, // "__real expr"/"__imag expr" Extension. 692 Extension, // __extension__ marker. 693 OffsetOf // __builtin_offsetof 694 }; 695private: 696 Stmt *Val; 697 Opcode Opc; 698 SourceLocation Loc; 699public: 700 701 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 702 : Expr(UnaryOperatorClass, type, 703 input->isTypeDependent() && opc != OffsetOf, 704 input->isValueDependent()), 705 Val(input), Opc(opc), Loc(l) {} 706 707 Opcode getOpcode() const { return Opc; } 708 Expr *getSubExpr() const { return cast<Expr>(Val); } 709 710 /// getOperatorLoc - Return the location of the operator. 711 SourceLocation getOperatorLoc() const { return Loc; } 712 713 /// isPostfix - Return true if this is a postfix operation, like x++. 714 static bool isPostfix(Opcode Op) { 715 return Op == PostInc || Op == PostDec; 716 } 717 718 /// isPostfix - Return true if this is a prefix operation, like --x. 719 static bool isPrefix(Opcode Op) { 720 return Op == PreInc || Op == PreDec; 721 } 722 723 bool isPrefix() const { return isPrefix(Opc); } 724 bool isPostfix() const { return isPostfix(Opc); } 725 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 726 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 727 bool isOffsetOfOp() const { return Opc == OffsetOf; } 728 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 729 730 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 731 /// corresponds to, e.g. "sizeof" or "[pre]++" 732 static const char *getOpcodeStr(Opcode Op); 733 734 /// \brief Retrieve the unary opcode that corresponds to the given 735 /// overloaded operator. 736 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 737 738 /// \brief Retrieve the overloaded operator kind that corresponds to 739 /// the given unary opcode. 740 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 741 742 virtual SourceRange getSourceRange() const { 743 if (isPostfix()) 744 return SourceRange(Val->getLocStart(), Loc); 745 else 746 return SourceRange(Loc, Val->getLocEnd()); 747 } 748 virtual SourceLocation getExprLoc() const { return Loc; } 749 750 static bool classof(const Stmt *T) { 751 return T->getStmtClass() == UnaryOperatorClass; 752 } 753 static bool classof(const UnaryOperator *) { return true; } 754 755 // Iterators 756 virtual child_iterator child_begin(); 757 virtual child_iterator child_end(); 758 759 virtual void EmitImpl(llvm::Serializer& S) const; 760 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 761}; 762 763/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 764/// types and expressions. 765class SizeOfAlignOfExpr : public Expr { 766 bool isSizeof : 1; // true if sizeof, false if alignof. 767 bool isType : 1; // true if operand is a type, false if an expression 768 union { 769 void *Ty; 770 Stmt *Ex; 771 } Argument; 772 SourceLocation OpLoc, RParenLoc; 773public: 774 SizeOfAlignOfExpr(bool issizeof, QualType T, 775 QualType resultType, SourceLocation op, 776 SourceLocation rp) : 777 Expr(SizeOfAlignOfExprClass, resultType, 778 false, // Never type-dependent (C++ [temp.dep.expr]p3). 779 // Value-dependent if the argument is type-dependent. 780 T->isDependentType()), 781 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 782 Argument.Ty = T.getAsOpaquePtr(); 783 } 784 785 SizeOfAlignOfExpr(bool issizeof, Expr *E, 786 QualType resultType, SourceLocation op, 787 SourceLocation rp) : 788 Expr(SizeOfAlignOfExprClass, resultType, 789 false, // Never type-dependent (C++ [temp.dep.expr]p3). 790 // Value-dependent if the argument is type-dependent. 791 E->isTypeDependent()), 792 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 793 Argument.Ex = E; 794 } 795 796 virtual void Destroy(ASTContext& C); 797 798 bool isSizeOf() const { return isSizeof; } 799 bool isArgumentType() const { return isType; } 800 QualType getArgumentType() const { 801 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 802 return QualType::getFromOpaquePtr(Argument.Ty); 803 } 804 Expr *getArgumentExpr() { 805 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 806 return static_cast<Expr*>(Argument.Ex); 807 } 808 const Expr *getArgumentExpr() const { 809 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 810 } 811 812 /// Gets the argument type, or the type of the argument expression, whichever 813 /// is appropriate. 814 QualType getTypeOfArgument() const { 815 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 816 } 817 818 SourceLocation getOperatorLoc() const { return OpLoc; } 819 820 virtual SourceRange getSourceRange() const { 821 return SourceRange(OpLoc, RParenLoc); 822 } 823 824 static bool classof(const Stmt *T) { 825 return T->getStmtClass() == SizeOfAlignOfExprClass; 826 } 827 static bool classof(const SizeOfAlignOfExpr *) { return true; } 828 829 // Iterators 830 virtual child_iterator child_begin(); 831 virtual child_iterator child_end(); 832 833 virtual void EmitImpl(llvm::Serializer& S) const; 834 static SizeOfAlignOfExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 835}; 836 837//===----------------------------------------------------------------------===// 838// Postfix Operators. 839//===----------------------------------------------------------------------===// 840 841/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 842class ArraySubscriptExpr : public Expr { 843 enum { LHS, RHS, END_EXPR=2 }; 844 Stmt* SubExprs[END_EXPR]; 845 SourceLocation RBracketLoc; 846public: 847 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 848 SourceLocation rbracketloc) 849 : Expr(ArraySubscriptExprClass, t, 850 lhs->isTypeDependent() || rhs->isTypeDependent(), 851 lhs->isValueDependent() || rhs->isValueDependent()), 852 RBracketLoc(rbracketloc) { 853 SubExprs[LHS] = lhs; 854 SubExprs[RHS] = rhs; 855 } 856 857 /// An array access can be written A[4] or 4[A] (both are equivalent). 858 /// - getBase() and getIdx() always present the normalized view: A[4]. 859 /// In this case getBase() returns "A" and getIdx() returns "4". 860 /// - getLHS() and getRHS() present the syntactic view. e.g. for 861 /// 4[A] getLHS() returns "4". 862 /// Note: Because vector element access is also written A[4] we must 863 /// predicate the format conversion in getBase and getIdx only on the 864 /// the type of the RHS, as it is possible for the LHS to be a vector of 865 /// integer type 866 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 867 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 868 869 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 870 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 871 872 Expr *getBase() { 873 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 874 } 875 876 const Expr *getBase() const { 877 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 878 } 879 880 Expr *getIdx() { 881 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 882 } 883 884 const Expr *getIdx() const { 885 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 886 } 887 888 virtual SourceRange getSourceRange() const { 889 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 890 } 891 892 SourceLocation getRBracketLoc() const { return RBracketLoc; } 893 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 894 895 static bool classof(const Stmt *T) { 896 return T->getStmtClass() == ArraySubscriptExprClass; 897 } 898 static bool classof(const ArraySubscriptExpr *) { return true; } 899 900 // Iterators 901 virtual child_iterator child_begin(); 902 virtual child_iterator child_end(); 903 904 virtual void EmitImpl(llvm::Serializer& S) const; 905 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 906}; 907 908 909/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 910/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 911/// while its subclasses may represent alternative syntax that (semantically) 912/// results in a function call. For example, CXXOperatorCallExpr is 913/// a subclass for overloaded operator calls that use operator syntax, e.g., 914/// "str1 + str2" to resolve to a function call. 915class CallExpr : public Expr { 916 enum { FN=0, ARGS_START=1 }; 917 Stmt **SubExprs; 918 unsigned NumArgs; 919 SourceLocation RParenLoc; 920 921 // This version of the ctor is for deserialization. 922 CallExpr(StmtClass SC, Stmt** subexprs, unsigned numargs, QualType t, 923 SourceLocation rparenloc) 924 : Expr(SC,t), SubExprs(subexprs), 925 NumArgs(numargs), RParenLoc(rparenloc) {} 926 927protected: 928 // This version of the constructor is for derived classes. 929 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 930 QualType t, SourceLocation rparenloc); 931 932public: 933 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 934 SourceLocation rparenloc); 935 936 ~CallExpr() {} 937 938 void Destroy(ASTContext& C); 939 940 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 941 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 942 void setCallee(Expr *F) { SubExprs[FN] = F; } 943 944 /// getNumArgs - Return the number of actual arguments to this call. 945 /// 946 unsigned getNumArgs() const { return NumArgs; } 947 948 /// getArg - Return the specified argument. 949 Expr *getArg(unsigned Arg) { 950 assert(Arg < NumArgs && "Arg access out of range!"); 951 return cast<Expr>(SubExprs[Arg+ARGS_START]); 952 } 953 const Expr *getArg(unsigned Arg) const { 954 assert(Arg < NumArgs && "Arg access out of range!"); 955 return cast<Expr>(SubExprs[Arg+ARGS_START]); 956 } 957 958 // FIXME: Why is this needed? Why not just create the CallExpr with the 959 // corect number of arguments? It makes the ASTs less brittle. 960 /// setArg - Set the specified argument. 961 void setArg(unsigned Arg, Expr *ArgExpr) { 962 assert(Arg < NumArgs && "Arg access out of range!"); 963 SubExprs[Arg+ARGS_START] = ArgExpr; 964 } 965 966 // FIXME: It would be great to just get rid of this. There is only one 967 // callee of this method, and it probably could be refactored to not use 968 // this method and instead just create a CallExpr with the right number of 969 // arguments. 970 /// setNumArgs - This changes the number of arguments present in this call. 971 /// Any orphaned expressions are deleted by this, and any new operands are set 972 /// to null. 973 void setNumArgs(ASTContext& C, unsigned NumArgs); 974 975 typedef ExprIterator arg_iterator; 976 typedef ConstExprIterator const_arg_iterator; 977 978 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 979 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 980 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 981 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 982 983 /// getNumCommas - Return the number of commas that must have been present in 984 /// this function call. 985 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 986 987 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 988 /// not, return 0. 989 unsigned isBuiltinCall(ASTContext &Context) const; 990 991 SourceLocation getRParenLoc() const { return RParenLoc; } 992 993 virtual SourceRange getSourceRange() const { 994 return SourceRange(getCallee()->getLocStart(), RParenLoc); 995 } 996 997 static bool classof(const Stmt *T) { 998 return T->getStmtClass() == CallExprClass || 999 T->getStmtClass() == CXXOperatorCallExprClass || 1000 T->getStmtClass() == CXXMemberCallExprClass; 1001 } 1002 static bool classof(const CallExpr *) { return true; } 1003 static bool classof(const CXXOperatorCallExpr *) { return true; } 1004 static bool classof(const CXXMemberCallExpr *) { return true; } 1005 1006 // Iterators 1007 virtual child_iterator child_begin(); 1008 virtual child_iterator child_end(); 1009 1010 virtual void EmitImpl(llvm::Serializer& S) const; 1011 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C, 1012 StmtClass SC); 1013}; 1014 1015/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1016/// 1017class MemberExpr : public Expr { 1018 /// Base - the expression for the base pointer or structure references. In 1019 /// X.F, this is "X". 1020 Stmt *Base; 1021 1022 /// MemberDecl - This is the decl being referenced by the field/member name. 1023 /// In X.F, this is the decl referenced by F. 1024 NamedDecl *MemberDecl; 1025 1026 /// MemberLoc - This is the location of the member name. 1027 SourceLocation MemberLoc; 1028 1029 /// IsArrow - True if this is "X->F", false if this is "X.F". 1030 bool IsArrow; 1031public: 1032 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1033 QualType ty) 1034 : Expr(MemberExprClass, ty), 1035 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 1036 1037 void setBase(Expr *E) { Base = E; } 1038 Expr *getBase() const { return cast<Expr>(Base); } 1039 1040 /// \brief Retrieve the member declaration to which this expression refers. 1041 /// 1042 /// The returned declaration will either be a FieldDecl or (in C++) 1043 /// a CXXMethodDecl. 1044 NamedDecl *getMemberDecl() const { return MemberDecl; } 1045 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1046 bool isArrow() const { return IsArrow; } 1047 1048 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1049 /// location of 'F'. 1050 SourceLocation getMemberLoc() const { return MemberLoc; } 1051 1052 virtual SourceRange getSourceRange() const { 1053 return SourceRange(getBase()->getLocStart(), MemberLoc); 1054 } 1055 1056 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1057 1058 static bool classof(const Stmt *T) { 1059 return T->getStmtClass() == MemberExprClass; 1060 } 1061 static bool classof(const MemberExpr *) { return true; } 1062 1063 // Iterators 1064 virtual child_iterator child_begin(); 1065 virtual child_iterator child_end(); 1066 1067 virtual void EmitImpl(llvm::Serializer& S) const; 1068 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1069}; 1070 1071/// CompoundLiteralExpr - [C99 6.5.2.5] 1072/// 1073class CompoundLiteralExpr : public Expr { 1074 /// LParenLoc - If non-null, this is the location of the left paren in a 1075 /// compound literal like "(int){4}". This can be null if this is a 1076 /// synthesized compound expression. 1077 SourceLocation LParenLoc; 1078 Stmt *Init; 1079 bool FileScope; 1080public: 1081 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1082 bool fileScope) 1083 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1084 FileScope(fileScope) {} 1085 1086 const Expr *getInitializer() const { return cast<Expr>(Init); } 1087 Expr *getInitializer() { return cast<Expr>(Init); } 1088 1089 bool isFileScope() const { return FileScope; } 1090 1091 SourceLocation getLParenLoc() const { return LParenLoc; } 1092 1093 virtual SourceRange getSourceRange() const { 1094 // FIXME: Init should never be null. 1095 if (!Init) 1096 return SourceRange(); 1097 if (LParenLoc.isInvalid()) 1098 return Init->getSourceRange(); 1099 return SourceRange(LParenLoc, Init->getLocEnd()); 1100 } 1101 1102 static bool classof(const Stmt *T) { 1103 return T->getStmtClass() == CompoundLiteralExprClass; 1104 } 1105 static bool classof(const CompoundLiteralExpr *) { return true; } 1106 1107 // Iterators 1108 virtual child_iterator child_begin(); 1109 virtual child_iterator child_end(); 1110 1111 virtual void EmitImpl(llvm::Serializer& S) const; 1112 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1113}; 1114 1115/// CastExpr - Base class for type casts, including both implicit 1116/// casts (ImplicitCastExpr) and explicit casts that have some 1117/// representation in the source code (ExplicitCastExpr's derived 1118/// classes). 1119class CastExpr : public Expr { 1120 Stmt *Op; 1121protected: 1122 CastExpr(StmtClass SC, QualType ty, Expr *op) : 1123 Expr(SC, ty, 1124 // Cast expressions are type-dependent if the type is 1125 // dependent (C++ [temp.dep.expr]p3). 1126 ty->isDependentType(), 1127 // Cast expressions are value-dependent if the type is 1128 // dependent or if the subexpression is value-dependent. 1129 ty->isDependentType() || (op && op->isValueDependent())), 1130 Op(op) {} 1131 1132 /// \brief Construct an empty cast. 1133 CastExpr(StmtClass SC, EmptyShell Empty) 1134 : Expr(SC, Empty) { } 1135 1136public: 1137 Expr *getSubExpr() { return cast<Expr>(Op); } 1138 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1139 void setSubExpr(Expr *E) { Op = E; } 1140 1141 static bool classof(const Stmt *T) { 1142 StmtClass SC = T->getStmtClass(); 1143 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1144 return true; 1145 1146 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1147 return true; 1148 1149 return false; 1150 } 1151 static bool classof(const CastExpr *) { return true; } 1152 1153 // Iterators 1154 virtual child_iterator child_begin(); 1155 virtual child_iterator child_end(); 1156}; 1157 1158/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1159/// conversions, which have no direct representation in the original 1160/// source code. For example: converting T[]->T*, void f()->void 1161/// (*f)(), float->double, short->int, etc. 1162/// 1163/// In C, implicit casts always produce rvalues. However, in C++, an 1164/// implicit cast whose result is being bound to a reference will be 1165/// an lvalue. For example: 1166/// 1167/// @code 1168/// class Base { }; 1169/// class Derived : public Base { }; 1170/// void f(Derived d) { 1171/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1172/// } 1173/// @endcode 1174class ImplicitCastExpr : public CastExpr { 1175 /// LvalueCast - Whether this cast produces an lvalue. 1176 bool LvalueCast; 1177 1178public: 1179 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 1180 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 1181 1182 /// \brief Construct an empty implicit cast. 1183 explicit ImplicitCastExpr(EmptyShell Shell) 1184 : CastExpr(ImplicitCastExprClass, Shell) { } 1185 1186 1187 virtual SourceRange getSourceRange() const { 1188 return getSubExpr()->getSourceRange(); 1189 } 1190 1191 /// isLvalueCast - Whether this cast produces an lvalue. 1192 bool isLvalueCast() const { return LvalueCast; } 1193 1194 /// setLvalueCast - Set whether this cast produces an lvalue. 1195 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1196 1197 static bool classof(const Stmt *T) { 1198 return T->getStmtClass() == ImplicitCastExprClass; 1199 } 1200 static bool classof(const ImplicitCastExpr *) { return true; } 1201 1202 virtual void EmitImpl(llvm::Serializer& S) const; 1203 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1204}; 1205 1206/// ExplicitCastExpr - An explicit cast written in the source 1207/// code. 1208/// 1209/// This class is effectively an abstract class, because it provides 1210/// the basic representation of an explicitly-written cast without 1211/// specifying which kind of cast (C cast, functional cast, static 1212/// cast, etc.) was written; specific derived classes represent the 1213/// particular style of cast and its location information. 1214/// 1215/// Unlike implicit casts, explicit cast nodes have two different 1216/// types: the type that was written into the source code, and the 1217/// actual type of the expression as determined by semantic 1218/// analysis. These types may differ slightly. For example, in C++ one 1219/// can cast to a reference type, which indicates that the resulting 1220/// expression will be an lvalue. The reference type, however, will 1221/// not be used as the type of the expression. 1222class ExplicitCastExpr : public CastExpr { 1223 /// TypeAsWritten - The type that this expression is casting to, as 1224 /// written in the source code. 1225 QualType TypeAsWritten; 1226 1227protected: 1228 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1229 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1230 1231 /// \brief Construct an empty explicit cast. 1232 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1233 : CastExpr(SC, Shell) { } 1234 1235public: 1236 /// getTypeAsWritten - Returns the type that this expression is 1237 /// casting to, as written in the source code. 1238 QualType getTypeAsWritten() const { return TypeAsWritten; } 1239 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1240 1241 static bool classof(const Stmt *T) { 1242 StmtClass SC = T->getStmtClass(); 1243 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1244 return true; 1245 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1246 return true; 1247 1248 return false; 1249 } 1250 static bool classof(const ExplicitCastExpr *) { return true; } 1251}; 1252 1253/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1254/// cast in C++ (C++ [expr.cast]), which uses the syntax 1255/// (Type)expr. For example: @c (int)f. 1256class CStyleCastExpr : public ExplicitCastExpr { 1257 SourceLocation LPLoc; // the location of the left paren 1258 SourceLocation RPLoc; // the location of the right paren 1259public: 1260 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1261 SourceLocation l, SourceLocation r) : 1262 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1263 LPLoc(l), RPLoc(r) {} 1264 1265 /// \brief Construct an empty C-style explicit cast. 1266 explicit CStyleCastExpr(EmptyShell Shell) 1267 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1268 1269 SourceLocation getLParenLoc() const { return LPLoc; } 1270 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1271 1272 SourceLocation getRParenLoc() const { return RPLoc; } 1273 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1274 1275 virtual SourceRange getSourceRange() const { 1276 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1277 } 1278 static bool classof(const Stmt *T) { 1279 return T->getStmtClass() == CStyleCastExprClass; 1280 } 1281 static bool classof(const CStyleCastExpr *) { return true; } 1282 1283 virtual void EmitImpl(llvm::Serializer& S) const; 1284 static CStyleCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1285}; 1286 1287/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1288/// 1289/// This expression node kind describes a builtin binary operation, 1290/// such as "x + y" for integer values "x" and "y". The operands will 1291/// already have been converted to appropriate types (e.g., by 1292/// performing promotions or conversions). 1293/// 1294/// In C++, where operators may be overloaded, a different kind of 1295/// expression node (CXXOperatorCallExpr) is used to express the 1296/// invocation of an overloaded operator with operator syntax. Within 1297/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1298/// used to store an expression "x + y" depends on the subexpressions 1299/// for x and y. If neither x or y is type-dependent, and the "+" 1300/// operator resolves to a built-in operation, BinaryOperator will be 1301/// used to express the computation (x and y may still be 1302/// value-dependent). If either x or y is type-dependent, or if the 1303/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1304/// be used to express the computation. 1305class BinaryOperator : public Expr { 1306public: 1307 enum Opcode { 1308 // Operators listed in order of precedence. 1309 // Note that additions to this should also update the StmtVisitor class. 1310 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1311 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1312 Add, Sub, // [C99 6.5.6] Additive operators. 1313 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1314 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1315 EQ, NE, // [C99 6.5.9] Equality operators. 1316 And, // [C99 6.5.10] Bitwise AND operator. 1317 Xor, // [C99 6.5.11] Bitwise XOR operator. 1318 Or, // [C99 6.5.12] Bitwise OR operator. 1319 LAnd, // [C99 6.5.13] Logical AND operator. 1320 LOr, // [C99 6.5.14] Logical OR operator. 1321 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1322 DivAssign, RemAssign, 1323 AddAssign, SubAssign, 1324 ShlAssign, ShrAssign, 1325 AndAssign, XorAssign, 1326 OrAssign, 1327 Comma // [C99 6.5.17] Comma operator. 1328 }; 1329private: 1330 enum { LHS, RHS, END_EXPR }; 1331 Stmt* SubExprs[END_EXPR]; 1332 Opcode Opc; 1333 SourceLocation OpLoc; 1334public: 1335 1336 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1337 SourceLocation opLoc) 1338 : Expr(BinaryOperatorClass, ResTy, 1339 lhs->isTypeDependent() || rhs->isTypeDependent(), 1340 lhs->isValueDependent() || rhs->isValueDependent()), 1341 Opc(opc), OpLoc(opLoc) { 1342 SubExprs[LHS] = lhs; 1343 SubExprs[RHS] = rhs; 1344 assert(!isCompoundAssignmentOp() && 1345 "Use ArithAssignBinaryOperator for compound assignments"); 1346 } 1347 1348 /// \brief Construct an empty binary operator. 1349 explicit BinaryOperator(EmptyShell Empty) 1350 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1351 1352 SourceLocation getOperatorLoc() const { return OpLoc; } 1353 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1354 1355 Opcode getOpcode() const { return Opc; } 1356 void setOpcode(Opcode O) { Opc = O; } 1357 1358 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1359 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1360 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1361 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1362 1363 virtual SourceRange getSourceRange() const { 1364 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1365 } 1366 1367 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1368 /// corresponds to, e.g. "<<=". 1369 static const char *getOpcodeStr(Opcode Op); 1370 1371 /// \brief Retrieve the binary opcode that corresponds to the given 1372 /// overloaded operator. 1373 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1374 1375 /// \brief Retrieve the overloaded operator kind that corresponds to 1376 /// the given binary opcode. 1377 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1378 1379 /// predicates to categorize the respective opcodes. 1380 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1381 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1382 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1383 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1384 1385 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1386 bool isRelationalOp() const { return isRelationalOp(Opc); } 1387 1388 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1389 bool isEqualityOp() const { return isEqualityOp(Opc); } 1390 1391 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1392 bool isLogicalOp() const { return isLogicalOp(Opc); } 1393 1394 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1395 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1396 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1397 1398 static bool classof(const Stmt *S) { 1399 return S->getStmtClass() == BinaryOperatorClass || 1400 S->getStmtClass() == CompoundAssignOperatorClass; 1401 } 1402 static bool classof(const BinaryOperator *) { return true; } 1403 1404 // Iterators 1405 virtual child_iterator child_begin(); 1406 virtual child_iterator child_end(); 1407 1408 virtual void EmitImpl(llvm::Serializer& S) const; 1409 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1410 1411protected: 1412 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1413 SourceLocation oploc, bool dead) 1414 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1415 SubExprs[LHS] = lhs; 1416 SubExprs[RHS] = rhs; 1417 } 1418}; 1419 1420/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1421/// track of the type the operation is performed in. Due to the semantics of 1422/// these operators, the operands are promoted, the aritmetic performed, an 1423/// implicit conversion back to the result type done, then the assignment takes 1424/// place. This captures the intermediate type which the computation is done 1425/// in. 1426class CompoundAssignOperator : public BinaryOperator { 1427 QualType ComputationLHSType; 1428 QualType ComputationResultType; 1429public: 1430 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1431 QualType ResType, QualType CompLHSType, 1432 QualType CompResultType, 1433 SourceLocation OpLoc) 1434 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1435 ComputationLHSType(CompLHSType), 1436 ComputationResultType(CompResultType) { 1437 assert(isCompoundAssignmentOp() && 1438 "Only should be used for compound assignments"); 1439 } 1440 1441 // The two computation types are the type the LHS is converted 1442 // to for the computation and the type of the result; the two are 1443 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1444 QualType getComputationLHSType() const { return ComputationLHSType; } 1445 QualType getComputationResultType() const { return ComputationResultType; } 1446 1447 static bool classof(const CompoundAssignOperator *) { return true; } 1448 static bool classof(const Stmt *S) { 1449 return S->getStmtClass() == CompoundAssignOperatorClass; 1450 } 1451 1452 virtual void EmitImpl(llvm::Serializer& S) const; 1453 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1454 ASTContext& C); 1455}; 1456 1457/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1458/// GNU "missing LHS" extension is in use. 1459/// 1460class ConditionalOperator : public Expr { 1461 enum { COND, LHS, RHS, END_EXPR }; 1462 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1463public: 1464 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1465 : Expr(ConditionalOperatorClass, t, 1466 // FIXME: the type of the conditional operator doesn't 1467 // depend on the type of the conditional, but the standard 1468 // seems to imply that it could. File a bug! 1469 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1470 (cond->isValueDependent() || 1471 (lhs && lhs->isValueDependent()) || 1472 (rhs && rhs->isValueDependent()))) { 1473 SubExprs[COND] = cond; 1474 SubExprs[LHS] = lhs; 1475 SubExprs[RHS] = rhs; 1476 } 1477 1478 // getCond - Return the expression representing the condition for 1479 // the ?: operator. 1480 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1481 1482 // getTrueExpr - Return the subexpression representing the value of the ?: 1483 // expression if the condition evaluates to true. In most cases this value 1484 // will be the same as getLHS() except a GCC extension allows the left 1485 // subexpression to be omitted, and instead of the condition be returned. 1486 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1487 // is only evaluated once. 1488 Expr *getTrueExpr() const { 1489 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1490 } 1491 1492 // getTrueExpr - Return the subexpression representing the value of the ?: 1493 // expression if the condition evaluates to false. This is the same as getRHS. 1494 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1495 1496 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1497 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1498 1499 virtual SourceRange getSourceRange() const { 1500 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1501 } 1502 static bool classof(const Stmt *T) { 1503 return T->getStmtClass() == ConditionalOperatorClass; 1504 } 1505 static bool classof(const ConditionalOperator *) { return true; } 1506 1507 // Iterators 1508 virtual child_iterator child_begin(); 1509 virtual child_iterator child_end(); 1510 1511 virtual void EmitImpl(llvm::Serializer& S) const; 1512 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1513}; 1514 1515/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1516class AddrLabelExpr : public Expr { 1517 SourceLocation AmpAmpLoc, LabelLoc; 1518 LabelStmt *Label; 1519public: 1520 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1521 QualType t) 1522 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1523 1524 virtual SourceRange getSourceRange() const { 1525 return SourceRange(AmpAmpLoc, LabelLoc); 1526 } 1527 1528 LabelStmt *getLabel() const { return Label; } 1529 1530 static bool classof(const Stmt *T) { 1531 return T->getStmtClass() == AddrLabelExprClass; 1532 } 1533 static bool classof(const AddrLabelExpr *) { return true; } 1534 1535 // Iterators 1536 virtual child_iterator child_begin(); 1537 virtual child_iterator child_end(); 1538 1539 virtual void EmitImpl(llvm::Serializer& S) const; 1540 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1541}; 1542 1543/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1544/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1545/// takes the value of the last subexpression. 1546class StmtExpr : public Expr { 1547 Stmt *SubStmt; 1548 SourceLocation LParenLoc, RParenLoc; 1549public: 1550 StmtExpr(CompoundStmt *substmt, QualType T, 1551 SourceLocation lp, SourceLocation rp) : 1552 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1553 1554 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1555 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1556 1557 virtual SourceRange getSourceRange() const { 1558 return SourceRange(LParenLoc, RParenLoc); 1559 } 1560 1561 SourceLocation getLParenLoc() const { return LParenLoc; } 1562 SourceLocation getRParenLoc() const { return RParenLoc; } 1563 1564 static bool classof(const Stmt *T) { 1565 return T->getStmtClass() == StmtExprClass; 1566 } 1567 static bool classof(const StmtExpr *) { return true; } 1568 1569 // Iterators 1570 virtual child_iterator child_begin(); 1571 virtual child_iterator child_end(); 1572 1573 virtual void EmitImpl(llvm::Serializer& S) const; 1574 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1575}; 1576 1577/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1578/// This AST node represents a function that returns 1 if two *types* (not 1579/// expressions) are compatible. The result of this built-in function can be 1580/// used in integer constant expressions. 1581class TypesCompatibleExpr : public Expr { 1582 QualType Type1; 1583 QualType Type2; 1584 SourceLocation BuiltinLoc, RParenLoc; 1585public: 1586 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1587 QualType t1, QualType t2, SourceLocation RP) : 1588 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1589 BuiltinLoc(BLoc), RParenLoc(RP) {} 1590 1591 QualType getArgType1() const { return Type1; } 1592 QualType getArgType2() const { return Type2; } 1593 1594 virtual SourceRange getSourceRange() const { 1595 return SourceRange(BuiltinLoc, RParenLoc); 1596 } 1597 static bool classof(const Stmt *T) { 1598 return T->getStmtClass() == TypesCompatibleExprClass; 1599 } 1600 static bool classof(const TypesCompatibleExpr *) { return true; } 1601 1602 // Iterators 1603 virtual child_iterator child_begin(); 1604 virtual child_iterator child_end(); 1605 1606 virtual void EmitImpl(llvm::Serializer& S) const; 1607 static TypesCompatibleExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1608}; 1609 1610/// ShuffleVectorExpr - clang-specific builtin-in function 1611/// __builtin_shufflevector. 1612/// This AST node represents a operator that does a constant 1613/// shuffle, similar to LLVM's shufflevector instruction. It takes 1614/// two vectors and a variable number of constant indices, 1615/// and returns the appropriately shuffled vector. 1616class ShuffleVectorExpr : public Expr { 1617 SourceLocation BuiltinLoc, RParenLoc; 1618 1619 // SubExprs - the list of values passed to the __builtin_shufflevector 1620 // function. The first two are vectors, and the rest are constant 1621 // indices. The number of values in this list is always 1622 // 2+the number of indices in the vector type. 1623 Stmt **SubExprs; 1624 unsigned NumExprs; 1625 1626public: 1627 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1628 QualType Type, SourceLocation BLoc, 1629 SourceLocation RP) : 1630 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1631 RParenLoc(RP), NumExprs(nexpr) { 1632 1633 SubExprs = new Stmt*[nexpr]; 1634 for (unsigned i = 0; i < nexpr; i++) 1635 SubExprs[i] = args[i]; 1636 } 1637 1638 virtual SourceRange getSourceRange() const { 1639 return SourceRange(BuiltinLoc, RParenLoc); 1640 } 1641 static bool classof(const Stmt *T) { 1642 return T->getStmtClass() == ShuffleVectorExprClass; 1643 } 1644 static bool classof(const ShuffleVectorExpr *) { return true; } 1645 1646 ~ShuffleVectorExpr() { 1647 delete [] SubExprs; 1648 } 1649 1650 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1651 /// constant expression, the actual arguments passed in, and the function 1652 /// pointers. 1653 unsigned getNumSubExprs() const { return NumExprs; } 1654 1655 /// getExpr - Return the Expr at the specified index. 1656 Expr *getExpr(unsigned Index) { 1657 assert((Index < NumExprs) && "Arg access out of range!"); 1658 return cast<Expr>(SubExprs[Index]); 1659 } 1660 const Expr *getExpr(unsigned Index) const { 1661 assert((Index < NumExprs) && "Arg access out of range!"); 1662 return cast<Expr>(SubExprs[Index]); 1663 } 1664 1665 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1666 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1667 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1668 } 1669 1670 // Iterators 1671 virtual child_iterator child_begin(); 1672 virtual child_iterator child_end(); 1673 1674 virtual void EmitImpl(llvm::Serializer& S) const; 1675 static ShuffleVectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1676}; 1677 1678/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1679/// This AST node is similar to the conditional operator (?:) in C, with 1680/// the following exceptions: 1681/// - the test expression must be a integer constant expression. 1682/// - the expression returned acts like the chosen subexpression in every 1683/// visible way: the type is the same as that of the chosen subexpression, 1684/// and all predicates (whether it's an l-value, whether it's an integer 1685/// constant expression, etc.) return the same result as for the chosen 1686/// sub-expression. 1687class ChooseExpr : public Expr { 1688 enum { COND, LHS, RHS, END_EXPR }; 1689 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1690 SourceLocation BuiltinLoc, RParenLoc; 1691public: 1692 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1693 SourceLocation RP) 1694 : Expr(ChooseExprClass, t), 1695 BuiltinLoc(BLoc), RParenLoc(RP) { 1696 SubExprs[COND] = cond; 1697 SubExprs[LHS] = lhs; 1698 SubExprs[RHS] = rhs; 1699 } 1700 1701 /// isConditionTrue - Return whether the condition is true (i.e. not 1702 /// equal to zero). 1703 bool isConditionTrue(ASTContext &C) const; 1704 1705 /// getChosenSubExpr - Return the subexpression chosen according to the 1706 /// condition. 1707 Expr *getChosenSubExpr(ASTContext &C) const { 1708 return isConditionTrue(C) ? getLHS() : getRHS(); 1709 } 1710 1711 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1712 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1713 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1714 1715 virtual SourceRange getSourceRange() const { 1716 return SourceRange(BuiltinLoc, RParenLoc); 1717 } 1718 static bool classof(const Stmt *T) { 1719 return T->getStmtClass() == ChooseExprClass; 1720 } 1721 static bool classof(const ChooseExpr *) { return true; } 1722 1723 // Iterators 1724 virtual child_iterator child_begin(); 1725 virtual child_iterator child_end(); 1726 1727 virtual void EmitImpl(llvm::Serializer& S) const; 1728 static ChooseExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1729}; 1730 1731/// GNUNullExpr - Implements the GNU __null extension, which is a name 1732/// for a null pointer constant that has integral type (e.g., int or 1733/// long) and is the same size and alignment as a pointer. The __null 1734/// extension is typically only used by system headers, which define 1735/// NULL as __null in C++ rather than using 0 (which is an integer 1736/// that may not match the size of a pointer). 1737class GNUNullExpr : public Expr { 1738 /// TokenLoc - The location of the __null keyword. 1739 SourceLocation TokenLoc; 1740 1741public: 1742 GNUNullExpr(QualType Ty, SourceLocation Loc) 1743 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1744 1745 /// getTokenLocation - The location of the __null token. 1746 SourceLocation getTokenLocation() const { return TokenLoc; } 1747 1748 virtual SourceRange getSourceRange() const { 1749 return SourceRange(TokenLoc); 1750 } 1751 static bool classof(const Stmt *T) { 1752 return T->getStmtClass() == GNUNullExprClass; 1753 } 1754 static bool classof(const GNUNullExpr *) { return true; } 1755 1756 // Iterators 1757 virtual child_iterator child_begin(); 1758 virtual child_iterator child_end(); 1759 1760 virtual void EmitImpl(llvm::Serializer& S) const; 1761 static GNUNullExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1762}; 1763 1764/// VAArgExpr, used for the builtin function __builtin_va_start. 1765class VAArgExpr : public Expr { 1766 Stmt *Val; 1767 SourceLocation BuiltinLoc, RParenLoc; 1768public: 1769 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1770 : Expr(VAArgExprClass, t), 1771 Val(e), 1772 BuiltinLoc(BLoc), 1773 RParenLoc(RPLoc) { } 1774 1775 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1776 Expr *getSubExpr() { return cast<Expr>(Val); } 1777 virtual SourceRange getSourceRange() const { 1778 return SourceRange(BuiltinLoc, RParenLoc); 1779 } 1780 static bool classof(const Stmt *T) { 1781 return T->getStmtClass() == VAArgExprClass; 1782 } 1783 static bool classof(const VAArgExpr *) { return true; } 1784 1785 // Iterators 1786 virtual child_iterator child_begin(); 1787 virtual child_iterator child_end(); 1788 1789 virtual void EmitImpl(llvm::Serializer& S) const; 1790 static VAArgExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1791}; 1792 1793/// @brief Describes an C or C++ initializer list. 1794/// 1795/// InitListExpr describes an initializer list, which can be used to 1796/// initialize objects of different types, including 1797/// struct/class/union types, arrays, and vectors. For example: 1798/// 1799/// @code 1800/// struct foo x = { 1, { 2, 3 } }; 1801/// @endcode 1802/// 1803/// Prior to semantic analysis, an initializer list will represent the 1804/// initializer list as written by the user, but will have the 1805/// placeholder type "void". This initializer list is called the 1806/// syntactic form of the initializer, and may contain C99 designated 1807/// initializers (represented as DesignatedInitExprs), initializations 1808/// of subobject members without explicit braces, and so on. Clients 1809/// interested in the original syntax of the initializer list should 1810/// use the syntactic form of the initializer list. 1811/// 1812/// After semantic analysis, the initializer list will represent the 1813/// semantic form of the initializer, where the initializations of all 1814/// subobjects are made explicit with nested InitListExpr nodes and 1815/// C99 designators have been eliminated by placing the designated 1816/// initializations into the subobject they initialize. Additionally, 1817/// any "holes" in the initialization, where no initializer has been 1818/// specified for a particular subobject, will be replaced with 1819/// implicitly-generated ImplicitValueInitExpr expressions that 1820/// value-initialize the subobjects. Note, however, that the 1821/// initializer lists may still have fewer initializers than there are 1822/// elements to initialize within the object. 1823/// 1824/// Given the semantic form of the initializer list, one can retrieve 1825/// the original syntactic form of that initializer list (if it 1826/// exists) using getSyntacticForm(). Since many initializer lists 1827/// have the same syntactic and semantic forms, getSyntacticForm() may 1828/// return NULL, indicating that the current initializer list also 1829/// serves as its syntactic form. 1830class InitListExpr : public Expr { 1831 std::vector<Stmt *> InitExprs; 1832 SourceLocation LBraceLoc, RBraceLoc; 1833 1834 /// Contains the initializer list that describes the syntactic form 1835 /// written in the source code. 1836 InitListExpr *SyntacticForm; 1837 1838 /// If this initializer list initializes a union, specifies which 1839 /// field within the union will be initialized. 1840 FieldDecl *UnionFieldInit; 1841 1842 /// Whether this initializer list originally had a GNU array-range 1843 /// designator in it. This is a temporary marker used by CodeGen. 1844 bool HadArrayRangeDesignator; 1845 1846public: 1847 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1848 SourceLocation rbraceloc); 1849 1850 unsigned getNumInits() const { return InitExprs.size(); } 1851 1852 const Expr* getInit(unsigned Init) const { 1853 assert(Init < getNumInits() && "Initializer access out of range!"); 1854 return cast_or_null<Expr>(InitExprs[Init]); 1855 } 1856 1857 Expr* getInit(unsigned Init) { 1858 assert(Init < getNumInits() && "Initializer access out of range!"); 1859 return cast_or_null<Expr>(InitExprs[Init]); 1860 } 1861 1862 void setInit(unsigned Init, Expr *expr) { 1863 assert(Init < getNumInits() && "Initializer access out of range!"); 1864 InitExprs[Init] = expr; 1865 } 1866 1867 /// \brief Reserve space for some number of initializers. 1868 void reserveInits(unsigned NumInits); 1869 1870 /// @brief Specify the number of initializers 1871 /// 1872 /// If there are more than @p NumInits initializers, the remaining 1873 /// initializers will be destroyed. If there are fewer than @p 1874 /// NumInits initializers, NULL expressions will be added for the 1875 /// unknown initializers. 1876 void resizeInits(ASTContext &Context, unsigned NumInits); 1877 1878 /// @brief Updates the initializer at index @p Init with the new 1879 /// expression @p expr, and returns the old expression at that 1880 /// location. 1881 /// 1882 /// When @p Init is out of range for this initializer list, the 1883 /// initializer list will be extended with NULL expressions to 1884 /// accomodate the new entry. 1885 Expr *updateInit(unsigned Init, Expr *expr); 1886 1887 /// \brief If this initializes a union, specifies which field in the 1888 /// union to initialize. 1889 /// 1890 /// Typically, this field is the first named field within the 1891 /// union. However, a designated initializer can specify the 1892 /// initialization of a different field within the union. 1893 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 1894 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 1895 1896 // Explicit InitListExpr's originate from source code (and have valid source 1897 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1898 bool isExplicit() { 1899 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1900 } 1901 1902 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 1903 1904 /// @brief Retrieve the initializer list that describes the 1905 /// syntactic form of the initializer. 1906 /// 1907 /// 1908 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 1909 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 1910 1911 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 1912 void sawArrayRangeDesignator() { 1913 HadArrayRangeDesignator = true; 1914 } 1915 1916 virtual SourceRange getSourceRange() const { 1917 return SourceRange(LBraceLoc, RBraceLoc); 1918 } 1919 static bool classof(const Stmt *T) { 1920 return T->getStmtClass() == InitListExprClass; 1921 } 1922 static bool classof(const InitListExpr *) { return true; } 1923 1924 // Iterators 1925 virtual child_iterator child_begin(); 1926 virtual child_iterator child_end(); 1927 1928 typedef std::vector<Stmt *>::iterator iterator; 1929 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 1930 1931 iterator begin() { return InitExprs.begin(); } 1932 iterator end() { return InitExprs.end(); } 1933 reverse_iterator rbegin() { return InitExprs.rbegin(); } 1934 reverse_iterator rend() { return InitExprs.rend(); } 1935 1936 // Serailization. 1937 virtual void EmitImpl(llvm::Serializer& S) const; 1938 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1939 1940private: 1941 // Used by serializer. 1942 InitListExpr() : Expr(InitListExprClass, QualType()) {} 1943}; 1944 1945/// @brief Represents a C99 designated initializer expression. 1946/// 1947/// A designated initializer expression (C99 6.7.8) contains one or 1948/// more designators (which can be field designators, array 1949/// designators, or GNU array-range designators) followed by an 1950/// expression that initializes the field or element(s) that the 1951/// designators refer to. For example, given: 1952/// 1953/// @code 1954/// struct point { 1955/// double x; 1956/// double y; 1957/// }; 1958/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 1959/// @endcode 1960/// 1961/// The InitListExpr contains three DesignatedInitExprs, the first of 1962/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 1963/// designators, one array designator for @c [2] followed by one field 1964/// designator for @c .y. The initalization expression will be 1.0. 1965class DesignatedInitExpr : public Expr { 1966 /// The location of the '=' or ':' prior to the actual initializer 1967 /// expression. 1968 SourceLocation EqualOrColonLoc; 1969 1970 /// Whether this designated initializer used the GNU deprecated 1971 /// syntax rather than the C99 '=' syntax. 1972 bool GNUSyntax : 1; 1973 1974 /// The number of designators in this initializer expression. 1975 unsigned NumDesignators : 15; 1976 1977 /// The number of subexpressions of this initializer expression, 1978 /// which contains both the initializer and any additional 1979 /// expressions used by array and array-range designators. 1980 unsigned NumSubExprs : 16; 1981 1982 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 1983 SourceLocation EqualOrColonLoc, bool GNUSyntax, 1984 unsigned NumSubExprs) 1985 : Expr(DesignatedInitExprClass, Ty), 1986 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 1987 NumDesignators(NumDesignators), NumSubExprs(NumSubExprs) { } 1988 1989public: 1990 /// A field designator, e.g., ".x". 1991 struct FieldDesignator { 1992 /// Refers to the field that is being initialized. The low bit 1993 /// of this field determines whether this is actually a pointer 1994 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 1995 /// initially constructed, a field designator will store an 1996 /// IdentifierInfo*. After semantic analysis has resolved that 1997 /// name, the field designator will instead store a FieldDecl*. 1998 uintptr_t NameOrField; 1999 2000 /// The location of the '.' in the designated initializer. 2001 unsigned DotLoc; 2002 2003 /// The location of the field name in the designated initializer. 2004 unsigned FieldLoc; 2005 }; 2006 2007 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2008 struct ArrayOrRangeDesignator { 2009 /// Location of the first index expression within the designated 2010 /// initializer expression's list of subexpressions. 2011 unsigned Index; 2012 /// The location of the '[' starting the array range designator. 2013 unsigned LBracketLoc; 2014 /// The location of the ellipsis separating the start and end 2015 /// indices. Only valid for GNU array-range designators. 2016 unsigned EllipsisLoc; 2017 /// The location of the ']' terminating the array range designator. 2018 unsigned RBracketLoc; 2019 }; 2020 2021 /// @brief Represents a single C99 designator. 2022 /// 2023 /// @todo This class is infuriatingly similar to clang::Designator, 2024 /// but minor differences (storing indices vs. storing pointers) 2025 /// keep us from reusing it. Try harder, later, to rectify these 2026 /// differences. 2027 class Designator { 2028 /// @brief The kind of designator this describes. 2029 enum { 2030 FieldDesignator, 2031 ArrayDesignator, 2032 ArrayRangeDesignator 2033 } Kind; 2034 2035 union { 2036 /// A field designator, e.g., ".x". 2037 struct FieldDesignator Field; 2038 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2039 struct ArrayOrRangeDesignator ArrayOrRange; 2040 }; 2041 friend class DesignatedInitExpr; 2042 2043 public: 2044 /// @brief Initializes a field designator. 2045 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2046 SourceLocation FieldLoc) 2047 : Kind(FieldDesignator) { 2048 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2049 Field.DotLoc = DotLoc.getRawEncoding(); 2050 Field.FieldLoc = FieldLoc.getRawEncoding(); 2051 } 2052 2053 /// @brief Initializes an array designator. 2054 Designator(unsigned Index, SourceLocation LBracketLoc, 2055 SourceLocation RBracketLoc) 2056 : Kind(ArrayDesignator) { 2057 ArrayOrRange.Index = Index; 2058 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2059 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2060 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2061 } 2062 2063 /// @brief Initializes a GNU array-range designator. 2064 Designator(unsigned Index, SourceLocation LBracketLoc, 2065 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2066 : Kind(ArrayRangeDesignator) { 2067 ArrayOrRange.Index = Index; 2068 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2069 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2070 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2071 } 2072 2073 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2074 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2075 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2076 2077 IdentifierInfo * getFieldName(); 2078 2079 FieldDecl *getField() { 2080 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2081 if (Field.NameOrField & 0x01) 2082 return 0; 2083 else 2084 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2085 } 2086 2087 void setField(FieldDecl *FD) { 2088 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2089 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2090 } 2091 2092 SourceLocation getDotLoc() const { 2093 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2094 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2095 } 2096 2097 SourceLocation getFieldLoc() const { 2098 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2099 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2100 } 2101 2102 SourceLocation getLBracketLoc() const { 2103 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2104 "Only valid on an array or array-range designator"); 2105 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2106 } 2107 2108 SourceLocation getRBracketLoc() const { 2109 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2110 "Only valid on an array or array-range designator"); 2111 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2112 } 2113 2114 SourceLocation getEllipsisLoc() const { 2115 assert(Kind == ArrayRangeDesignator && 2116 "Only valid on an array-range designator"); 2117 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2118 } 2119 2120 SourceLocation getStartLocation() const { 2121 if (Kind == FieldDesignator) 2122 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2123 else 2124 return getLBracketLoc(); 2125 } 2126 }; 2127 2128 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2129 unsigned NumDesignators, 2130 Expr **IndexExprs, unsigned NumIndexExprs, 2131 SourceLocation EqualOrColonLoc, 2132 bool GNUSyntax, Expr *Init); 2133 2134 /// @brief Returns the number of designators in this initializer. 2135 unsigned size() const { return NumDesignators; } 2136 2137 // Iterator access to the designators. 2138 typedef Designator* designators_iterator; 2139 designators_iterator designators_begin(); 2140 designators_iterator designators_end(); 2141 2142 Expr *getArrayIndex(const Designator& D); 2143 Expr *getArrayRangeStart(const Designator& D); 2144 Expr *getArrayRangeEnd(const Designator& D); 2145 2146 /// @brief Retrieve the location of the '=' that precedes the 2147 /// initializer value itself, if present. 2148 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2149 2150 /// @brief Determines whether this designated initializer used the 2151 /// deprecated GNU syntax for designated initializers. 2152 bool usesGNUSyntax() const { return GNUSyntax; } 2153 2154 /// @brief Retrieve the initializer value. 2155 Expr *getInit() const { 2156 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2157 } 2158 2159 void setInit(Expr *init) { 2160 *child_begin() = init; 2161 } 2162 2163 virtual SourceRange getSourceRange() const; 2164 2165 static bool classof(const Stmt *T) { 2166 return T->getStmtClass() == DesignatedInitExprClass; 2167 } 2168 static bool classof(const DesignatedInitExpr *) { return true; } 2169 2170 // Iterators 2171 virtual child_iterator child_begin(); 2172 virtual child_iterator child_end(); 2173}; 2174 2175/// \brief Represents an implicitly-generated value initialization of 2176/// an object of a given type. 2177/// 2178/// Implicit value initializations occur within semantic initializer 2179/// list expressions (InitListExpr) as placeholders for subobject 2180/// initializations not explicitly specified by the user. 2181/// 2182/// \see InitListExpr 2183class ImplicitValueInitExpr : public Expr { 2184public: 2185 explicit ImplicitValueInitExpr(QualType ty) 2186 : Expr(ImplicitValueInitExprClass, ty) { } 2187 2188 static bool classof(const Stmt *T) { 2189 return T->getStmtClass() == ImplicitValueInitExprClass; 2190 } 2191 static bool classof(const ImplicitValueInitExpr *) { return true; } 2192 2193 virtual SourceRange getSourceRange() const { 2194 return SourceRange(); 2195 } 2196 2197 // Iterators 2198 virtual child_iterator child_begin(); 2199 virtual child_iterator child_end(); 2200}; 2201 2202//===----------------------------------------------------------------------===// 2203// Clang Extensions 2204//===----------------------------------------------------------------------===// 2205 2206 2207/// ExtVectorElementExpr - This represents access to specific elements of a 2208/// vector, and may occur on the left hand side or right hand side. For example 2209/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2210/// 2211/// Note that the base may have either vector or pointer to vector type, just 2212/// like a struct field reference. 2213/// 2214class ExtVectorElementExpr : public Expr { 2215 Stmt *Base; 2216 IdentifierInfo &Accessor; 2217 SourceLocation AccessorLoc; 2218public: 2219 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2220 SourceLocation loc) 2221 : Expr(ExtVectorElementExprClass, ty), 2222 Base(base), Accessor(accessor), AccessorLoc(loc) {} 2223 2224 const Expr *getBase() const { return cast<Expr>(Base); } 2225 Expr *getBase() { return cast<Expr>(Base); } 2226 2227 IdentifierInfo &getAccessor() const { return Accessor; } 2228 2229 /// getNumElements - Get the number of components being selected. 2230 unsigned getNumElements() const; 2231 2232 /// containsDuplicateElements - Return true if any element access is 2233 /// repeated. 2234 bool containsDuplicateElements() const; 2235 2236 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2237 /// aggregate Constant of ConstantInt(s). 2238 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2239 2240 virtual SourceRange getSourceRange() const { 2241 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2242 } 2243 2244 /// isArrow - Return true if the base expression is a pointer to vector, 2245 /// return false if the base expression is a vector. 2246 bool isArrow() const; 2247 2248 static bool classof(const Stmt *T) { 2249 return T->getStmtClass() == ExtVectorElementExprClass; 2250 } 2251 static bool classof(const ExtVectorElementExpr *) { return true; } 2252 2253 // Iterators 2254 virtual child_iterator child_begin(); 2255 virtual child_iterator child_end(); 2256 2257 virtual void EmitImpl(llvm::Serializer& S) const; 2258 static ExtVectorElementExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2259}; 2260 2261 2262/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2263/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2264class BlockExpr : public Expr { 2265protected: 2266 BlockDecl *TheBlock; 2267 bool HasBlockDeclRefExprs; 2268public: 2269 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2270 : Expr(BlockExprClass, ty), 2271 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2272 2273 const BlockDecl *getBlockDecl() const { return TheBlock; } 2274 BlockDecl *getBlockDecl() { return TheBlock; } 2275 2276 // Convenience functions for probing the underlying BlockDecl. 2277 SourceLocation getCaretLocation() const; 2278 const Stmt *getBody() const; 2279 Stmt *getBody(); 2280 2281 virtual SourceRange getSourceRange() const { 2282 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2283 } 2284 2285 /// getFunctionType - Return the underlying function type for this block. 2286 const FunctionType *getFunctionType() const; 2287 2288 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2289 /// contained inside. 2290 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2291 2292 static bool classof(const Stmt *T) { 2293 return T->getStmtClass() == BlockExprClass; 2294 } 2295 static bool classof(const BlockExpr *) { return true; } 2296 2297 // Iterators 2298 virtual child_iterator child_begin(); 2299 virtual child_iterator child_end(); 2300 2301 virtual void EmitImpl(llvm::Serializer& S) const; 2302 static BlockExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2303}; 2304 2305/// BlockDeclRefExpr - A reference to a declared variable, function, 2306/// enum, etc. 2307class BlockDeclRefExpr : public Expr { 2308 ValueDecl *D; 2309 SourceLocation Loc; 2310 bool IsByRef; 2311public: 2312 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2313 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2314 2315 ValueDecl *getDecl() { return D; } 2316 const ValueDecl *getDecl() const { return D; } 2317 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2318 2319 bool isByRef() const { return IsByRef; } 2320 2321 static bool classof(const Stmt *T) { 2322 return T->getStmtClass() == BlockDeclRefExprClass; 2323 } 2324 static bool classof(const BlockDeclRefExpr *) { return true; } 2325 2326 // Iterators 2327 virtual child_iterator child_begin(); 2328 virtual child_iterator child_end(); 2329 2330 virtual void EmitImpl(llvm::Serializer& S) const; 2331 static BlockDeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2332}; 2333 2334} // end namespace clang 2335 2336#endif 2337