Expr.h revision 673ecd6a4a9f7c12fb6f76f84f654dbdcdc89e76
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 /// \brief Construct an empty string literal. 585 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 586 587 StringLiteral* Clone(ASTContext &C) const; 588 void Destroy(ASTContext &C); 589 590 const char *getStrData() const { return StrData; } 591 unsigned getByteLength() const { return ByteLength; } 592 593 /// \brief Sets the string data to the given string data. 594 void setStrData(ASTContext &C, const char *Str, unsigned Len); 595 596 bool isWide() const { return IsWide; } 597 void setWide(bool W) { IsWide = W; } 598 599 bool containsNonAsciiOrNull() const { 600 for (unsigned i = 0; i < getByteLength(); ++i) 601 if (!isascii(getStrData()[i]) || !getStrData()[i]) 602 return true; 603 return false; 604 } 605 /// getNumConcatenated - Get the number of string literal tokens that were 606 /// concatenated in translation phase #6 to form this string literal. 607 unsigned getNumConcatenated() const { return NumConcatenated; } 608 609 SourceLocation getStrTokenLoc(unsigned TokNum) const { 610 assert(TokNum < NumConcatenated && "Invalid tok number"); 611 return TokLocs[TokNum]; 612 } 613 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 614 assert(TokNum < NumConcatenated && "Invalid tok number"); 615 TokLocs[TokNum] = L; 616 } 617 618 typedef const SourceLocation *tokloc_iterator; 619 tokloc_iterator tokloc_begin() const { return TokLocs; } 620 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 621 622 virtual SourceRange getSourceRange() const { 623 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 624 } 625 static bool classof(const Stmt *T) { 626 return T->getStmtClass() == StringLiteralClass; 627 } 628 static bool classof(const StringLiteral *) { return true; } 629 630 // Iterators 631 virtual child_iterator child_begin(); 632 virtual child_iterator child_end(); 633 634 virtual void EmitImpl(llvm::Serializer& S) const; 635 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 636}; 637 638/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 639/// AST node is only formed if full location information is requested. 640class ParenExpr : public Expr { 641 SourceLocation L, R; 642 Stmt *Val; 643public: 644 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 645 : Expr(ParenExprClass, val->getType(), 646 val->isTypeDependent(), val->isValueDependent()), 647 L(l), R(r), Val(val) {} 648 649 /// \brief Construct an empty parenthesized expression. 650 explicit ParenExpr(EmptyShell Empty) 651 : Expr(ParenExprClass, Empty) { } 652 653 const Expr *getSubExpr() const { return cast<Expr>(Val); } 654 Expr *getSubExpr() { return cast<Expr>(Val); } 655 void setSubExpr(Expr *E) { Val = E; } 656 657 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 658 659 /// \brief Get the location of the left parentheses '('. 660 SourceLocation getLParen() const { return L; } 661 void setLParen(SourceLocation Loc) { L = Loc; } 662 663 /// \brief Get the location of the right parentheses ')'. 664 SourceLocation getRParen() const { return R; } 665 void setRParen(SourceLocation Loc) { R = Loc; } 666 667 static bool classof(const Stmt *T) { 668 return T->getStmtClass() == ParenExprClass; 669 } 670 static bool classof(const ParenExpr *) { return true; } 671 672 // Iterators 673 virtual child_iterator child_begin(); 674 virtual child_iterator child_end(); 675 676 virtual void EmitImpl(llvm::Serializer& S) const; 677 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 678}; 679 680 681/// UnaryOperator - This represents the unary-expression's (except sizeof and 682/// alignof), the postinc/postdec operators from postfix-expression, and various 683/// extensions. 684/// 685/// Notes on various nodes: 686/// 687/// Real/Imag - These return the real/imag part of a complex operand. If 688/// applied to a non-complex value, the former returns its operand and the 689/// later returns zero in the type of the operand. 690/// 691/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 692/// subexpression is a compound literal with the various MemberExpr and 693/// ArraySubscriptExpr's applied to it. 694/// 695class UnaryOperator : public Expr { 696public: 697 // Note that additions to this should also update the StmtVisitor class. 698 enum Opcode { 699 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 700 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 701 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 702 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 703 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 704 Real, Imag, // "__real expr"/"__imag expr" Extension. 705 Extension, // __extension__ marker. 706 OffsetOf // __builtin_offsetof 707 }; 708private: 709 Stmt *Val; 710 Opcode Opc; 711 SourceLocation Loc; 712public: 713 714 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 715 : Expr(UnaryOperatorClass, type, 716 input->isTypeDependent() && opc != OffsetOf, 717 input->isValueDependent()), 718 Val(input), Opc(opc), Loc(l) {} 719 720 /// \brief Build an empty unary operator. 721 explicit UnaryOperator(EmptyShell Empty) 722 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 723 724 Opcode getOpcode() const { return Opc; } 725 void setOpcode(Opcode O) { Opc = O; } 726 727 Expr *getSubExpr() const { return cast<Expr>(Val); } 728 void setSubExpr(Expr *E) { Val = E; } 729 730 /// getOperatorLoc - Return the location of the operator. 731 SourceLocation getOperatorLoc() const { return Loc; } 732 void setOperatorLoc(SourceLocation L) { Loc = L; } 733 734 /// isPostfix - Return true if this is a postfix operation, like x++. 735 static bool isPostfix(Opcode Op) { 736 return Op == PostInc || Op == PostDec; 737 } 738 739 /// isPostfix - Return true if this is a prefix operation, like --x. 740 static bool isPrefix(Opcode Op) { 741 return Op == PreInc || Op == PreDec; 742 } 743 744 bool isPrefix() const { return isPrefix(Opc); } 745 bool isPostfix() const { return isPostfix(Opc); } 746 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 747 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 748 bool isOffsetOfOp() const { return Opc == OffsetOf; } 749 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 750 751 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 752 /// corresponds to, e.g. "sizeof" or "[pre]++" 753 static const char *getOpcodeStr(Opcode Op); 754 755 /// \brief Retrieve the unary opcode that corresponds to the given 756 /// overloaded operator. 757 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 758 759 /// \brief Retrieve the overloaded operator kind that corresponds to 760 /// the given unary opcode. 761 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 762 763 virtual SourceRange getSourceRange() const { 764 if (isPostfix()) 765 return SourceRange(Val->getLocStart(), Loc); 766 else 767 return SourceRange(Loc, Val->getLocEnd()); 768 } 769 virtual SourceLocation getExprLoc() const { return Loc; } 770 771 static bool classof(const Stmt *T) { 772 return T->getStmtClass() == UnaryOperatorClass; 773 } 774 static bool classof(const UnaryOperator *) { return true; } 775 776 // Iterators 777 virtual child_iterator child_begin(); 778 virtual child_iterator child_end(); 779 780 virtual void EmitImpl(llvm::Serializer& S) const; 781 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 782}; 783 784/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 785/// types and expressions. 786class SizeOfAlignOfExpr : public Expr { 787 bool isSizeof : 1; // true if sizeof, false if alignof. 788 bool isType : 1; // true if operand is a type, false if an expression 789 union { 790 void *Ty; 791 Stmt *Ex; 792 } Argument; 793 SourceLocation OpLoc, RParenLoc; 794public: 795 SizeOfAlignOfExpr(bool issizeof, QualType T, 796 QualType resultType, SourceLocation op, 797 SourceLocation rp) : 798 Expr(SizeOfAlignOfExprClass, resultType, 799 false, // Never type-dependent (C++ [temp.dep.expr]p3). 800 // Value-dependent if the argument is type-dependent. 801 T->isDependentType()), 802 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 803 Argument.Ty = T.getAsOpaquePtr(); 804 } 805 806 SizeOfAlignOfExpr(bool issizeof, Expr *E, 807 QualType resultType, SourceLocation op, 808 SourceLocation rp) : 809 Expr(SizeOfAlignOfExprClass, resultType, 810 false, // Never type-dependent (C++ [temp.dep.expr]p3). 811 // Value-dependent if the argument is type-dependent. 812 E->isTypeDependent()), 813 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 814 Argument.Ex = E; 815 } 816 817 /// \brief Construct an empty sizeof/alignof expression. 818 explicit SizeOfAlignOfExpr(EmptyShell Empty) 819 : Expr(SizeOfAlignOfExprClass, Empty) { } 820 821 virtual void Destroy(ASTContext& C); 822 823 bool isSizeOf() const { return isSizeof; } 824 void setSizeof(bool S) { isSizeof = S; } 825 826 bool isArgumentType() const { return isType; } 827 QualType getArgumentType() const { 828 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 829 return QualType::getFromOpaquePtr(Argument.Ty); 830 } 831 Expr *getArgumentExpr() { 832 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 833 return static_cast<Expr*>(Argument.Ex); 834 } 835 const Expr *getArgumentExpr() const { 836 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 837 } 838 839 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 840 void setArgument(QualType T) { 841 Argument.Ty = T.getAsOpaquePtr(); 842 isType = true; 843 } 844 845 /// Gets the argument type, or the type of the argument expression, whichever 846 /// is appropriate. 847 QualType getTypeOfArgument() const { 848 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 849 } 850 851 SourceLocation getOperatorLoc() const { return OpLoc; } 852 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 853 854 SourceLocation getRParenLoc() const { return RParenLoc; } 855 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 856 857 virtual SourceRange getSourceRange() const { 858 return SourceRange(OpLoc, RParenLoc); 859 } 860 861 static bool classof(const Stmt *T) { 862 return T->getStmtClass() == SizeOfAlignOfExprClass; 863 } 864 static bool classof(const SizeOfAlignOfExpr *) { return true; } 865 866 // Iterators 867 virtual child_iterator child_begin(); 868 virtual child_iterator child_end(); 869 870 virtual void EmitImpl(llvm::Serializer& S) const; 871 static SizeOfAlignOfExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 872}; 873 874//===----------------------------------------------------------------------===// 875// Postfix Operators. 876//===----------------------------------------------------------------------===// 877 878/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 879class ArraySubscriptExpr : public Expr { 880 enum { LHS, RHS, END_EXPR=2 }; 881 Stmt* SubExprs[END_EXPR]; 882 SourceLocation RBracketLoc; 883public: 884 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 885 SourceLocation rbracketloc) 886 : Expr(ArraySubscriptExprClass, t, 887 lhs->isTypeDependent() || rhs->isTypeDependent(), 888 lhs->isValueDependent() || rhs->isValueDependent()), 889 RBracketLoc(rbracketloc) { 890 SubExprs[LHS] = lhs; 891 SubExprs[RHS] = rhs; 892 } 893 894 /// An array access can be written A[4] or 4[A] (both are equivalent). 895 /// - getBase() and getIdx() always present the normalized view: A[4]. 896 /// In this case getBase() returns "A" and getIdx() returns "4". 897 /// - getLHS() and getRHS() present the syntactic view. e.g. for 898 /// 4[A] getLHS() returns "4". 899 /// Note: Because vector element access is also written A[4] we must 900 /// predicate the format conversion in getBase and getIdx only on the 901 /// the type of the RHS, as it is possible for the LHS to be a vector of 902 /// integer type 903 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 904 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 905 906 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 907 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 908 909 Expr *getBase() { 910 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 911 } 912 913 const Expr *getBase() const { 914 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 915 } 916 917 Expr *getIdx() { 918 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 919 } 920 921 const Expr *getIdx() const { 922 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 923 } 924 925 virtual SourceRange getSourceRange() const { 926 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 927 } 928 929 SourceLocation getRBracketLoc() const { return RBracketLoc; } 930 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 931 932 static bool classof(const Stmt *T) { 933 return T->getStmtClass() == ArraySubscriptExprClass; 934 } 935 static bool classof(const ArraySubscriptExpr *) { return true; } 936 937 // Iterators 938 virtual child_iterator child_begin(); 939 virtual child_iterator child_end(); 940 941 virtual void EmitImpl(llvm::Serializer& S) const; 942 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 943}; 944 945 946/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 947/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 948/// while its subclasses may represent alternative syntax that (semantically) 949/// results in a function call. For example, CXXOperatorCallExpr is 950/// a subclass for overloaded operator calls that use operator syntax, e.g., 951/// "str1 + str2" to resolve to a function call. 952class CallExpr : public Expr { 953 enum { FN=0, ARGS_START=1 }; 954 Stmt **SubExprs; 955 unsigned NumArgs; 956 SourceLocation RParenLoc; 957 958 // This version of the ctor is for deserialization. 959 CallExpr(StmtClass SC, Stmt** subexprs, unsigned numargs, QualType t, 960 SourceLocation rparenloc) 961 : Expr(SC,t), SubExprs(subexprs), 962 NumArgs(numargs), RParenLoc(rparenloc) {} 963 964protected: 965 // This version of the constructor is for derived classes. 966 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 967 QualType t, SourceLocation rparenloc); 968 969public: 970 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 971 SourceLocation rparenloc); 972 973 ~CallExpr() {} 974 975 void Destroy(ASTContext& C); 976 977 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 978 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 979 void setCallee(Expr *F) { SubExprs[FN] = F; } 980 981 /// getNumArgs - Return the number of actual arguments to this call. 982 /// 983 unsigned getNumArgs() const { return NumArgs; } 984 985 /// getArg - Return the specified argument. 986 Expr *getArg(unsigned Arg) { 987 assert(Arg < NumArgs && "Arg access out of range!"); 988 return cast<Expr>(SubExprs[Arg+ARGS_START]); 989 } 990 const Expr *getArg(unsigned Arg) const { 991 assert(Arg < NumArgs && "Arg access out of range!"); 992 return cast<Expr>(SubExprs[Arg+ARGS_START]); 993 } 994 995 // FIXME: Why is this needed? Why not just create the CallExpr with the 996 // corect number of arguments? It makes the ASTs less brittle. 997 /// setArg - Set the specified argument. 998 void setArg(unsigned Arg, Expr *ArgExpr) { 999 assert(Arg < NumArgs && "Arg access out of range!"); 1000 SubExprs[Arg+ARGS_START] = ArgExpr; 1001 } 1002 1003 // FIXME: It would be great to just get rid of this. There is only one 1004 // callee of this method, and it probably could be refactored to not use 1005 // this method and instead just create a CallExpr with the right number of 1006 // arguments. 1007 /// setNumArgs - This changes the number of arguments present in this call. 1008 /// Any orphaned expressions are deleted by this, and any new operands are set 1009 /// to null. 1010 void setNumArgs(ASTContext& C, unsigned NumArgs); 1011 1012 typedef ExprIterator arg_iterator; 1013 typedef ConstExprIterator const_arg_iterator; 1014 1015 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1016 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1017 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1018 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1019 1020 /// getNumCommas - Return the number of commas that must have been present in 1021 /// this function call. 1022 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1023 1024 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1025 /// not, return 0. 1026 unsigned isBuiltinCall(ASTContext &Context) const; 1027 1028 SourceLocation getRParenLoc() const { return RParenLoc; } 1029 1030 virtual SourceRange getSourceRange() const { 1031 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1032 } 1033 1034 static bool classof(const Stmt *T) { 1035 return T->getStmtClass() == CallExprClass || 1036 T->getStmtClass() == CXXOperatorCallExprClass || 1037 T->getStmtClass() == CXXMemberCallExprClass; 1038 } 1039 static bool classof(const CallExpr *) { return true; } 1040 static bool classof(const CXXOperatorCallExpr *) { return true; } 1041 static bool classof(const CXXMemberCallExpr *) { return true; } 1042 1043 // Iterators 1044 virtual child_iterator child_begin(); 1045 virtual child_iterator child_end(); 1046 1047 virtual void EmitImpl(llvm::Serializer& S) const; 1048 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C, 1049 StmtClass SC); 1050}; 1051 1052/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1053/// 1054class MemberExpr : public Expr { 1055 /// Base - the expression for the base pointer or structure references. In 1056 /// X.F, this is "X". 1057 Stmt *Base; 1058 1059 /// MemberDecl - This is the decl being referenced by the field/member name. 1060 /// In X.F, this is the decl referenced by F. 1061 NamedDecl *MemberDecl; 1062 1063 /// MemberLoc - This is the location of the member name. 1064 SourceLocation MemberLoc; 1065 1066 /// IsArrow - True if this is "X->F", false if this is "X.F". 1067 bool IsArrow; 1068public: 1069 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1070 QualType ty) 1071 : Expr(MemberExprClass, ty), 1072 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 1073 1074 void setBase(Expr *E) { Base = E; } 1075 Expr *getBase() const { return cast<Expr>(Base); } 1076 1077 /// \brief Retrieve the member declaration to which this expression refers. 1078 /// 1079 /// The returned declaration will either be a FieldDecl or (in C++) 1080 /// a CXXMethodDecl. 1081 NamedDecl *getMemberDecl() const { return MemberDecl; } 1082 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1083 bool isArrow() const { return IsArrow; } 1084 1085 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1086 /// location of 'F'. 1087 SourceLocation getMemberLoc() const { return MemberLoc; } 1088 1089 virtual SourceRange getSourceRange() const { 1090 return SourceRange(getBase()->getLocStart(), MemberLoc); 1091 } 1092 1093 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1094 1095 static bool classof(const Stmt *T) { 1096 return T->getStmtClass() == MemberExprClass; 1097 } 1098 static bool classof(const MemberExpr *) { return true; } 1099 1100 // Iterators 1101 virtual child_iterator child_begin(); 1102 virtual child_iterator child_end(); 1103 1104 virtual void EmitImpl(llvm::Serializer& S) const; 1105 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1106}; 1107 1108/// CompoundLiteralExpr - [C99 6.5.2.5] 1109/// 1110class CompoundLiteralExpr : public Expr { 1111 /// LParenLoc - If non-null, this is the location of the left paren in a 1112 /// compound literal like "(int){4}". This can be null if this is a 1113 /// synthesized compound expression. 1114 SourceLocation LParenLoc; 1115 Stmt *Init; 1116 bool FileScope; 1117public: 1118 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1119 bool fileScope) 1120 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1121 FileScope(fileScope) {} 1122 1123 const Expr *getInitializer() const { return cast<Expr>(Init); } 1124 Expr *getInitializer() { return cast<Expr>(Init); } 1125 1126 bool isFileScope() const { return FileScope; } 1127 1128 SourceLocation getLParenLoc() const { return LParenLoc; } 1129 1130 virtual SourceRange getSourceRange() const { 1131 // FIXME: Init should never be null. 1132 if (!Init) 1133 return SourceRange(); 1134 if (LParenLoc.isInvalid()) 1135 return Init->getSourceRange(); 1136 return SourceRange(LParenLoc, Init->getLocEnd()); 1137 } 1138 1139 static bool classof(const Stmt *T) { 1140 return T->getStmtClass() == CompoundLiteralExprClass; 1141 } 1142 static bool classof(const CompoundLiteralExpr *) { return true; } 1143 1144 // Iterators 1145 virtual child_iterator child_begin(); 1146 virtual child_iterator child_end(); 1147 1148 virtual void EmitImpl(llvm::Serializer& S) const; 1149 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1150}; 1151 1152/// CastExpr - Base class for type casts, including both implicit 1153/// casts (ImplicitCastExpr) and explicit casts that have some 1154/// representation in the source code (ExplicitCastExpr's derived 1155/// classes). 1156class CastExpr : public Expr { 1157 Stmt *Op; 1158protected: 1159 CastExpr(StmtClass SC, QualType ty, Expr *op) : 1160 Expr(SC, ty, 1161 // Cast expressions are type-dependent if the type is 1162 // dependent (C++ [temp.dep.expr]p3). 1163 ty->isDependentType(), 1164 // Cast expressions are value-dependent if the type is 1165 // dependent or if the subexpression is value-dependent. 1166 ty->isDependentType() || (op && op->isValueDependent())), 1167 Op(op) {} 1168 1169 /// \brief Construct an empty cast. 1170 CastExpr(StmtClass SC, EmptyShell Empty) 1171 : Expr(SC, Empty) { } 1172 1173public: 1174 Expr *getSubExpr() { return cast<Expr>(Op); } 1175 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1176 void setSubExpr(Expr *E) { Op = E; } 1177 1178 static bool classof(const Stmt *T) { 1179 StmtClass SC = T->getStmtClass(); 1180 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1181 return true; 1182 1183 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1184 return true; 1185 1186 return false; 1187 } 1188 static bool classof(const CastExpr *) { return true; } 1189 1190 // Iterators 1191 virtual child_iterator child_begin(); 1192 virtual child_iterator child_end(); 1193}; 1194 1195/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1196/// conversions, which have no direct representation in the original 1197/// source code. For example: converting T[]->T*, void f()->void 1198/// (*f)(), float->double, short->int, etc. 1199/// 1200/// In C, implicit casts always produce rvalues. However, in C++, an 1201/// implicit cast whose result is being bound to a reference will be 1202/// an lvalue. For example: 1203/// 1204/// @code 1205/// class Base { }; 1206/// class Derived : public Base { }; 1207/// void f(Derived d) { 1208/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1209/// } 1210/// @endcode 1211class ImplicitCastExpr : public CastExpr { 1212 /// LvalueCast - Whether this cast produces an lvalue. 1213 bool LvalueCast; 1214 1215public: 1216 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 1217 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 1218 1219 /// \brief Construct an empty implicit cast. 1220 explicit ImplicitCastExpr(EmptyShell Shell) 1221 : CastExpr(ImplicitCastExprClass, Shell) { } 1222 1223 1224 virtual SourceRange getSourceRange() const { 1225 return getSubExpr()->getSourceRange(); 1226 } 1227 1228 /// isLvalueCast - Whether this cast produces an lvalue. 1229 bool isLvalueCast() const { return LvalueCast; } 1230 1231 /// setLvalueCast - Set whether this cast produces an lvalue. 1232 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1233 1234 static bool classof(const Stmt *T) { 1235 return T->getStmtClass() == ImplicitCastExprClass; 1236 } 1237 static bool classof(const ImplicitCastExpr *) { return true; } 1238 1239 virtual void EmitImpl(llvm::Serializer& S) const; 1240 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1241}; 1242 1243/// ExplicitCastExpr - An explicit cast written in the source 1244/// code. 1245/// 1246/// This class is effectively an abstract class, because it provides 1247/// the basic representation of an explicitly-written cast without 1248/// specifying which kind of cast (C cast, functional cast, static 1249/// cast, etc.) was written; specific derived classes represent the 1250/// particular style of cast and its location information. 1251/// 1252/// Unlike implicit casts, explicit cast nodes have two different 1253/// types: the type that was written into the source code, and the 1254/// actual type of the expression as determined by semantic 1255/// analysis. These types may differ slightly. For example, in C++ one 1256/// can cast to a reference type, which indicates that the resulting 1257/// expression will be an lvalue. The reference type, however, will 1258/// not be used as the type of the expression. 1259class ExplicitCastExpr : public CastExpr { 1260 /// TypeAsWritten - The type that this expression is casting to, as 1261 /// written in the source code. 1262 QualType TypeAsWritten; 1263 1264protected: 1265 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1266 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1267 1268 /// \brief Construct an empty explicit cast. 1269 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1270 : CastExpr(SC, Shell) { } 1271 1272public: 1273 /// getTypeAsWritten - Returns the type that this expression is 1274 /// casting to, as written in the source code. 1275 QualType getTypeAsWritten() const { return TypeAsWritten; } 1276 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1277 1278 static bool classof(const Stmt *T) { 1279 StmtClass SC = T->getStmtClass(); 1280 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1281 return true; 1282 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1283 return true; 1284 1285 return false; 1286 } 1287 static bool classof(const ExplicitCastExpr *) { return true; } 1288}; 1289 1290/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1291/// cast in C++ (C++ [expr.cast]), which uses the syntax 1292/// (Type)expr. For example: @c (int)f. 1293class CStyleCastExpr : public ExplicitCastExpr { 1294 SourceLocation LPLoc; // the location of the left paren 1295 SourceLocation RPLoc; // the location of the right paren 1296public: 1297 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1298 SourceLocation l, SourceLocation r) : 1299 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1300 LPLoc(l), RPLoc(r) {} 1301 1302 /// \brief Construct an empty C-style explicit cast. 1303 explicit CStyleCastExpr(EmptyShell Shell) 1304 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1305 1306 SourceLocation getLParenLoc() const { return LPLoc; } 1307 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1308 1309 SourceLocation getRParenLoc() const { return RPLoc; } 1310 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1311 1312 virtual SourceRange getSourceRange() const { 1313 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1314 } 1315 static bool classof(const Stmt *T) { 1316 return T->getStmtClass() == CStyleCastExprClass; 1317 } 1318 static bool classof(const CStyleCastExpr *) { return true; } 1319 1320 virtual void EmitImpl(llvm::Serializer& S) const; 1321 static CStyleCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1322}; 1323 1324/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1325/// 1326/// This expression node kind describes a builtin binary operation, 1327/// such as "x + y" for integer values "x" and "y". The operands will 1328/// already have been converted to appropriate types (e.g., by 1329/// performing promotions or conversions). 1330/// 1331/// In C++, where operators may be overloaded, a different kind of 1332/// expression node (CXXOperatorCallExpr) is used to express the 1333/// invocation of an overloaded operator with operator syntax. Within 1334/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1335/// used to store an expression "x + y" depends on the subexpressions 1336/// for x and y. If neither x or y is type-dependent, and the "+" 1337/// operator resolves to a built-in operation, BinaryOperator will be 1338/// used to express the computation (x and y may still be 1339/// value-dependent). If either x or y is type-dependent, or if the 1340/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1341/// be used to express the computation. 1342class BinaryOperator : public Expr { 1343public: 1344 enum Opcode { 1345 // Operators listed in order of precedence. 1346 // Note that additions to this should also update the StmtVisitor class. 1347 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1348 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1349 Add, Sub, // [C99 6.5.6] Additive operators. 1350 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1351 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1352 EQ, NE, // [C99 6.5.9] Equality operators. 1353 And, // [C99 6.5.10] Bitwise AND operator. 1354 Xor, // [C99 6.5.11] Bitwise XOR operator. 1355 Or, // [C99 6.5.12] Bitwise OR operator. 1356 LAnd, // [C99 6.5.13] Logical AND operator. 1357 LOr, // [C99 6.5.14] Logical OR operator. 1358 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1359 DivAssign, RemAssign, 1360 AddAssign, SubAssign, 1361 ShlAssign, ShrAssign, 1362 AndAssign, XorAssign, 1363 OrAssign, 1364 Comma // [C99 6.5.17] Comma operator. 1365 }; 1366private: 1367 enum { LHS, RHS, END_EXPR }; 1368 Stmt* SubExprs[END_EXPR]; 1369 Opcode Opc; 1370 SourceLocation OpLoc; 1371public: 1372 1373 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1374 SourceLocation opLoc) 1375 : Expr(BinaryOperatorClass, ResTy, 1376 lhs->isTypeDependent() || rhs->isTypeDependent(), 1377 lhs->isValueDependent() || rhs->isValueDependent()), 1378 Opc(opc), OpLoc(opLoc) { 1379 SubExprs[LHS] = lhs; 1380 SubExprs[RHS] = rhs; 1381 assert(!isCompoundAssignmentOp() && 1382 "Use ArithAssignBinaryOperator for compound assignments"); 1383 } 1384 1385 /// \brief Construct an empty binary operator. 1386 explicit BinaryOperator(EmptyShell Empty) 1387 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1388 1389 SourceLocation getOperatorLoc() const { return OpLoc; } 1390 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1391 1392 Opcode getOpcode() const { return Opc; } 1393 void setOpcode(Opcode O) { Opc = O; } 1394 1395 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1396 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1397 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1398 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1399 1400 virtual SourceRange getSourceRange() const { 1401 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1402 } 1403 1404 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1405 /// corresponds to, e.g. "<<=". 1406 static const char *getOpcodeStr(Opcode Op); 1407 1408 /// \brief Retrieve the binary opcode that corresponds to the given 1409 /// overloaded operator. 1410 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1411 1412 /// \brief Retrieve the overloaded operator kind that corresponds to 1413 /// the given binary opcode. 1414 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1415 1416 /// predicates to categorize the respective opcodes. 1417 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1418 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1419 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1420 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1421 1422 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1423 bool isRelationalOp() const { return isRelationalOp(Opc); } 1424 1425 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1426 bool isEqualityOp() const { return isEqualityOp(Opc); } 1427 1428 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1429 bool isLogicalOp() const { return isLogicalOp(Opc); } 1430 1431 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1432 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1433 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1434 1435 static bool classof(const Stmt *S) { 1436 return S->getStmtClass() == BinaryOperatorClass || 1437 S->getStmtClass() == CompoundAssignOperatorClass; 1438 } 1439 static bool classof(const BinaryOperator *) { return true; } 1440 1441 // Iterators 1442 virtual child_iterator child_begin(); 1443 virtual child_iterator child_end(); 1444 1445 virtual void EmitImpl(llvm::Serializer& S) const; 1446 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1447 1448protected: 1449 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1450 SourceLocation oploc, bool dead) 1451 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1452 SubExprs[LHS] = lhs; 1453 SubExprs[RHS] = rhs; 1454 } 1455}; 1456 1457/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1458/// track of the type the operation is performed in. Due to the semantics of 1459/// these operators, the operands are promoted, the aritmetic performed, an 1460/// implicit conversion back to the result type done, then the assignment takes 1461/// place. This captures the intermediate type which the computation is done 1462/// in. 1463class CompoundAssignOperator : public BinaryOperator { 1464 QualType ComputationLHSType; 1465 QualType ComputationResultType; 1466public: 1467 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1468 QualType ResType, QualType CompLHSType, 1469 QualType CompResultType, 1470 SourceLocation OpLoc) 1471 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1472 ComputationLHSType(CompLHSType), 1473 ComputationResultType(CompResultType) { 1474 assert(isCompoundAssignmentOp() && 1475 "Only should be used for compound assignments"); 1476 } 1477 1478 // The two computation types are the type the LHS is converted 1479 // to for the computation and the type of the result; the two are 1480 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1481 QualType getComputationLHSType() const { return ComputationLHSType; } 1482 QualType getComputationResultType() const { return ComputationResultType; } 1483 1484 static bool classof(const CompoundAssignOperator *) { return true; } 1485 static bool classof(const Stmt *S) { 1486 return S->getStmtClass() == CompoundAssignOperatorClass; 1487 } 1488 1489 virtual void EmitImpl(llvm::Serializer& S) const; 1490 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1491 ASTContext& C); 1492}; 1493 1494/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1495/// GNU "missing LHS" extension is in use. 1496/// 1497class ConditionalOperator : public Expr { 1498 enum { COND, LHS, RHS, END_EXPR }; 1499 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1500public: 1501 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1502 : Expr(ConditionalOperatorClass, t, 1503 // FIXME: the type of the conditional operator doesn't 1504 // depend on the type of the conditional, but the standard 1505 // seems to imply that it could. File a bug! 1506 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1507 (cond->isValueDependent() || 1508 (lhs && lhs->isValueDependent()) || 1509 (rhs && rhs->isValueDependent()))) { 1510 SubExprs[COND] = cond; 1511 SubExprs[LHS] = lhs; 1512 SubExprs[RHS] = rhs; 1513 } 1514 1515 // getCond - Return the expression representing the condition for 1516 // the ?: operator. 1517 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1518 1519 // getTrueExpr - Return the subexpression representing the value of the ?: 1520 // expression if the condition evaluates to true. In most cases this value 1521 // will be the same as getLHS() except a GCC extension allows the left 1522 // subexpression to be omitted, and instead of the condition be returned. 1523 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1524 // is only evaluated once. 1525 Expr *getTrueExpr() const { 1526 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1527 } 1528 1529 // getTrueExpr - Return the subexpression representing the value of the ?: 1530 // expression if the condition evaluates to false. This is the same as getRHS. 1531 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1532 1533 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1534 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1535 1536 virtual SourceRange getSourceRange() const { 1537 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1538 } 1539 static bool classof(const Stmt *T) { 1540 return T->getStmtClass() == ConditionalOperatorClass; 1541 } 1542 static bool classof(const ConditionalOperator *) { return true; } 1543 1544 // Iterators 1545 virtual child_iterator child_begin(); 1546 virtual child_iterator child_end(); 1547 1548 virtual void EmitImpl(llvm::Serializer& S) const; 1549 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1550}; 1551 1552/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1553class AddrLabelExpr : public Expr { 1554 SourceLocation AmpAmpLoc, LabelLoc; 1555 LabelStmt *Label; 1556public: 1557 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1558 QualType t) 1559 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1560 1561 virtual SourceRange getSourceRange() const { 1562 return SourceRange(AmpAmpLoc, LabelLoc); 1563 } 1564 1565 LabelStmt *getLabel() const { return Label; } 1566 1567 static bool classof(const Stmt *T) { 1568 return T->getStmtClass() == AddrLabelExprClass; 1569 } 1570 static bool classof(const AddrLabelExpr *) { return true; } 1571 1572 // Iterators 1573 virtual child_iterator child_begin(); 1574 virtual child_iterator child_end(); 1575 1576 virtual void EmitImpl(llvm::Serializer& S) const; 1577 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1578}; 1579 1580/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1581/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1582/// takes the value of the last subexpression. 1583class StmtExpr : public Expr { 1584 Stmt *SubStmt; 1585 SourceLocation LParenLoc, RParenLoc; 1586public: 1587 StmtExpr(CompoundStmt *substmt, QualType T, 1588 SourceLocation lp, SourceLocation rp) : 1589 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1590 1591 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1592 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1593 1594 virtual SourceRange getSourceRange() const { 1595 return SourceRange(LParenLoc, RParenLoc); 1596 } 1597 1598 SourceLocation getLParenLoc() const { return LParenLoc; } 1599 SourceLocation getRParenLoc() const { return RParenLoc; } 1600 1601 static bool classof(const Stmt *T) { 1602 return T->getStmtClass() == StmtExprClass; 1603 } 1604 static bool classof(const StmtExpr *) { return true; } 1605 1606 // Iterators 1607 virtual child_iterator child_begin(); 1608 virtual child_iterator child_end(); 1609 1610 virtual void EmitImpl(llvm::Serializer& S) const; 1611 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1612}; 1613 1614/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1615/// This AST node represents a function that returns 1 if two *types* (not 1616/// expressions) are compatible. The result of this built-in function can be 1617/// used in integer constant expressions. 1618class TypesCompatibleExpr : public Expr { 1619 QualType Type1; 1620 QualType Type2; 1621 SourceLocation BuiltinLoc, RParenLoc; 1622public: 1623 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1624 QualType t1, QualType t2, SourceLocation RP) : 1625 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1626 BuiltinLoc(BLoc), RParenLoc(RP) {} 1627 1628 QualType getArgType1() const { return Type1; } 1629 QualType getArgType2() const { return Type2; } 1630 1631 virtual SourceRange getSourceRange() const { 1632 return SourceRange(BuiltinLoc, RParenLoc); 1633 } 1634 static bool classof(const Stmt *T) { 1635 return T->getStmtClass() == TypesCompatibleExprClass; 1636 } 1637 static bool classof(const TypesCompatibleExpr *) { return true; } 1638 1639 // Iterators 1640 virtual child_iterator child_begin(); 1641 virtual child_iterator child_end(); 1642 1643 virtual void EmitImpl(llvm::Serializer& S) const; 1644 static TypesCompatibleExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1645}; 1646 1647/// ShuffleVectorExpr - clang-specific builtin-in function 1648/// __builtin_shufflevector. 1649/// This AST node represents a operator that does a constant 1650/// shuffle, similar to LLVM's shufflevector instruction. It takes 1651/// two vectors and a variable number of constant indices, 1652/// and returns the appropriately shuffled vector. 1653class ShuffleVectorExpr : public Expr { 1654 SourceLocation BuiltinLoc, RParenLoc; 1655 1656 // SubExprs - the list of values passed to the __builtin_shufflevector 1657 // function. The first two are vectors, and the rest are constant 1658 // indices. The number of values in this list is always 1659 // 2+the number of indices in the vector type. 1660 Stmt **SubExprs; 1661 unsigned NumExprs; 1662 1663public: 1664 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1665 QualType Type, SourceLocation BLoc, 1666 SourceLocation RP) : 1667 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1668 RParenLoc(RP), NumExprs(nexpr) { 1669 1670 SubExprs = new Stmt*[nexpr]; 1671 for (unsigned i = 0; i < nexpr; i++) 1672 SubExprs[i] = args[i]; 1673 } 1674 1675 virtual SourceRange getSourceRange() const { 1676 return SourceRange(BuiltinLoc, RParenLoc); 1677 } 1678 static bool classof(const Stmt *T) { 1679 return T->getStmtClass() == ShuffleVectorExprClass; 1680 } 1681 static bool classof(const ShuffleVectorExpr *) { return true; } 1682 1683 ~ShuffleVectorExpr() { 1684 delete [] SubExprs; 1685 } 1686 1687 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1688 /// constant expression, the actual arguments passed in, and the function 1689 /// pointers. 1690 unsigned getNumSubExprs() const { return NumExprs; } 1691 1692 /// getExpr - Return the Expr at the specified index. 1693 Expr *getExpr(unsigned Index) { 1694 assert((Index < NumExprs) && "Arg access out of range!"); 1695 return cast<Expr>(SubExprs[Index]); 1696 } 1697 const Expr *getExpr(unsigned Index) const { 1698 assert((Index < NumExprs) && "Arg access out of range!"); 1699 return cast<Expr>(SubExprs[Index]); 1700 } 1701 1702 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1703 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1704 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1705 } 1706 1707 // Iterators 1708 virtual child_iterator child_begin(); 1709 virtual child_iterator child_end(); 1710 1711 virtual void EmitImpl(llvm::Serializer& S) const; 1712 static ShuffleVectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1713}; 1714 1715/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1716/// This AST node is similar to the conditional operator (?:) in C, with 1717/// the following exceptions: 1718/// - the test expression must be a integer constant expression. 1719/// - the expression returned acts like the chosen subexpression in every 1720/// visible way: the type is the same as that of the chosen subexpression, 1721/// and all predicates (whether it's an l-value, whether it's an integer 1722/// constant expression, etc.) return the same result as for the chosen 1723/// sub-expression. 1724class ChooseExpr : public Expr { 1725 enum { COND, LHS, RHS, END_EXPR }; 1726 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1727 SourceLocation BuiltinLoc, RParenLoc; 1728public: 1729 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1730 SourceLocation RP) 1731 : Expr(ChooseExprClass, t), 1732 BuiltinLoc(BLoc), RParenLoc(RP) { 1733 SubExprs[COND] = cond; 1734 SubExprs[LHS] = lhs; 1735 SubExprs[RHS] = rhs; 1736 } 1737 1738 /// isConditionTrue - Return whether the condition is true (i.e. not 1739 /// equal to zero). 1740 bool isConditionTrue(ASTContext &C) const; 1741 1742 /// getChosenSubExpr - Return the subexpression chosen according to the 1743 /// condition. 1744 Expr *getChosenSubExpr(ASTContext &C) const { 1745 return isConditionTrue(C) ? getLHS() : getRHS(); 1746 } 1747 1748 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1749 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1750 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1751 1752 virtual SourceRange getSourceRange() const { 1753 return SourceRange(BuiltinLoc, RParenLoc); 1754 } 1755 static bool classof(const Stmt *T) { 1756 return T->getStmtClass() == ChooseExprClass; 1757 } 1758 static bool classof(const ChooseExpr *) { return true; } 1759 1760 // Iterators 1761 virtual child_iterator child_begin(); 1762 virtual child_iterator child_end(); 1763 1764 virtual void EmitImpl(llvm::Serializer& S) const; 1765 static ChooseExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1766}; 1767 1768/// GNUNullExpr - Implements the GNU __null extension, which is a name 1769/// for a null pointer constant that has integral type (e.g., int or 1770/// long) and is the same size and alignment as a pointer. The __null 1771/// extension is typically only used by system headers, which define 1772/// NULL as __null in C++ rather than using 0 (which is an integer 1773/// that may not match the size of a pointer). 1774class GNUNullExpr : public Expr { 1775 /// TokenLoc - The location of the __null keyword. 1776 SourceLocation TokenLoc; 1777 1778public: 1779 GNUNullExpr(QualType Ty, SourceLocation Loc) 1780 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1781 1782 /// getTokenLocation - The location of the __null token. 1783 SourceLocation getTokenLocation() const { return TokenLoc; } 1784 1785 virtual SourceRange getSourceRange() const { 1786 return SourceRange(TokenLoc); 1787 } 1788 static bool classof(const Stmt *T) { 1789 return T->getStmtClass() == GNUNullExprClass; 1790 } 1791 static bool classof(const GNUNullExpr *) { return true; } 1792 1793 // Iterators 1794 virtual child_iterator child_begin(); 1795 virtual child_iterator child_end(); 1796 1797 virtual void EmitImpl(llvm::Serializer& S) const; 1798 static GNUNullExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1799}; 1800 1801/// VAArgExpr, used for the builtin function __builtin_va_start. 1802class VAArgExpr : public Expr { 1803 Stmt *Val; 1804 SourceLocation BuiltinLoc, RParenLoc; 1805public: 1806 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1807 : Expr(VAArgExprClass, t), 1808 Val(e), 1809 BuiltinLoc(BLoc), 1810 RParenLoc(RPLoc) { } 1811 1812 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1813 Expr *getSubExpr() { return cast<Expr>(Val); } 1814 virtual SourceRange getSourceRange() const { 1815 return SourceRange(BuiltinLoc, RParenLoc); 1816 } 1817 static bool classof(const Stmt *T) { 1818 return T->getStmtClass() == VAArgExprClass; 1819 } 1820 static bool classof(const VAArgExpr *) { return true; } 1821 1822 // Iterators 1823 virtual child_iterator child_begin(); 1824 virtual child_iterator child_end(); 1825 1826 virtual void EmitImpl(llvm::Serializer& S) const; 1827 static VAArgExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1828}; 1829 1830/// @brief Describes an C or C++ initializer list. 1831/// 1832/// InitListExpr describes an initializer list, which can be used to 1833/// initialize objects of different types, including 1834/// struct/class/union types, arrays, and vectors. For example: 1835/// 1836/// @code 1837/// struct foo x = { 1, { 2, 3 } }; 1838/// @endcode 1839/// 1840/// Prior to semantic analysis, an initializer list will represent the 1841/// initializer list as written by the user, but will have the 1842/// placeholder type "void". This initializer list is called the 1843/// syntactic form of the initializer, and may contain C99 designated 1844/// initializers (represented as DesignatedInitExprs), initializations 1845/// of subobject members without explicit braces, and so on. Clients 1846/// interested in the original syntax of the initializer list should 1847/// use the syntactic form of the initializer list. 1848/// 1849/// After semantic analysis, the initializer list will represent the 1850/// semantic form of the initializer, where the initializations of all 1851/// subobjects are made explicit with nested InitListExpr nodes and 1852/// C99 designators have been eliminated by placing the designated 1853/// initializations into the subobject they initialize. Additionally, 1854/// any "holes" in the initialization, where no initializer has been 1855/// specified for a particular subobject, will be replaced with 1856/// implicitly-generated ImplicitValueInitExpr expressions that 1857/// value-initialize the subobjects. Note, however, that the 1858/// initializer lists may still have fewer initializers than there are 1859/// elements to initialize within the object. 1860/// 1861/// Given the semantic form of the initializer list, one can retrieve 1862/// the original syntactic form of that initializer list (if it 1863/// exists) using getSyntacticForm(). Since many initializer lists 1864/// have the same syntactic and semantic forms, getSyntacticForm() may 1865/// return NULL, indicating that the current initializer list also 1866/// serves as its syntactic form. 1867class InitListExpr : public Expr { 1868 std::vector<Stmt *> InitExprs; 1869 SourceLocation LBraceLoc, RBraceLoc; 1870 1871 /// Contains the initializer list that describes the syntactic form 1872 /// written in the source code. 1873 InitListExpr *SyntacticForm; 1874 1875 /// If this initializer list initializes a union, specifies which 1876 /// field within the union will be initialized. 1877 FieldDecl *UnionFieldInit; 1878 1879 /// Whether this initializer list originally had a GNU array-range 1880 /// designator in it. This is a temporary marker used by CodeGen. 1881 bool HadArrayRangeDesignator; 1882 1883public: 1884 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1885 SourceLocation rbraceloc); 1886 1887 unsigned getNumInits() const { return InitExprs.size(); } 1888 1889 const Expr* getInit(unsigned Init) const { 1890 assert(Init < getNumInits() && "Initializer access out of range!"); 1891 return cast_or_null<Expr>(InitExprs[Init]); 1892 } 1893 1894 Expr* getInit(unsigned Init) { 1895 assert(Init < getNumInits() && "Initializer access out of range!"); 1896 return cast_or_null<Expr>(InitExprs[Init]); 1897 } 1898 1899 void setInit(unsigned Init, Expr *expr) { 1900 assert(Init < getNumInits() && "Initializer access out of range!"); 1901 InitExprs[Init] = expr; 1902 } 1903 1904 /// \brief Reserve space for some number of initializers. 1905 void reserveInits(unsigned NumInits); 1906 1907 /// @brief Specify the number of initializers 1908 /// 1909 /// If there are more than @p NumInits initializers, the remaining 1910 /// initializers will be destroyed. If there are fewer than @p 1911 /// NumInits initializers, NULL expressions will be added for the 1912 /// unknown initializers. 1913 void resizeInits(ASTContext &Context, unsigned NumInits); 1914 1915 /// @brief Updates the initializer at index @p Init with the new 1916 /// expression @p expr, and returns the old expression at that 1917 /// location. 1918 /// 1919 /// When @p Init is out of range for this initializer list, the 1920 /// initializer list will be extended with NULL expressions to 1921 /// accomodate the new entry. 1922 Expr *updateInit(unsigned Init, Expr *expr); 1923 1924 /// \brief If this initializes a union, specifies which field in the 1925 /// union to initialize. 1926 /// 1927 /// Typically, this field is the first named field within the 1928 /// union. However, a designated initializer can specify the 1929 /// initialization of a different field within the union. 1930 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 1931 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 1932 1933 // Explicit InitListExpr's originate from source code (and have valid source 1934 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1935 bool isExplicit() { 1936 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1937 } 1938 1939 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 1940 1941 /// @brief Retrieve the initializer list that describes the 1942 /// syntactic form of the initializer. 1943 /// 1944 /// 1945 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 1946 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 1947 1948 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 1949 void sawArrayRangeDesignator() { 1950 HadArrayRangeDesignator = true; 1951 } 1952 1953 virtual SourceRange getSourceRange() const { 1954 return SourceRange(LBraceLoc, RBraceLoc); 1955 } 1956 static bool classof(const Stmt *T) { 1957 return T->getStmtClass() == InitListExprClass; 1958 } 1959 static bool classof(const InitListExpr *) { return true; } 1960 1961 // Iterators 1962 virtual child_iterator child_begin(); 1963 virtual child_iterator child_end(); 1964 1965 typedef std::vector<Stmt *>::iterator iterator; 1966 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 1967 1968 iterator begin() { return InitExprs.begin(); } 1969 iterator end() { return InitExprs.end(); } 1970 reverse_iterator rbegin() { return InitExprs.rbegin(); } 1971 reverse_iterator rend() { return InitExprs.rend(); } 1972 1973 // Serailization. 1974 virtual void EmitImpl(llvm::Serializer& S) const; 1975 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1976 1977private: 1978 // Used by serializer. 1979 InitListExpr() : Expr(InitListExprClass, QualType()) {} 1980}; 1981 1982/// @brief Represents a C99 designated initializer expression. 1983/// 1984/// A designated initializer expression (C99 6.7.8) contains one or 1985/// more designators (which can be field designators, array 1986/// designators, or GNU array-range designators) followed by an 1987/// expression that initializes the field or element(s) that the 1988/// designators refer to. For example, given: 1989/// 1990/// @code 1991/// struct point { 1992/// double x; 1993/// double y; 1994/// }; 1995/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 1996/// @endcode 1997/// 1998/// The InitListExpr contains three DesignatedInitExprs, the first of 1999/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2000/// designators, one array designator for @c [2] followed by one field 2001/// designator for @c .y. The initalization expression will be 1.0. 2002class DesignatedInitExpr : public Expr { 2003public: 2004 /// \brief Forward declaration of the Designator class. 2005 class Designator; 2006 2007private: 2008 /// The location of the '=' or ':' prior to the actual initializer 2009 /// expression. 2010 SourceLocation EqualOrColonLoc; 2011 2012 /// Whether this designated initializer used the GNU deprecated 2013 /// syntax rather than the C99 '=' syntax. 2014 bool GNUSyntax : 1; 2015 2016 /// The number of designators in this initializer expression. 2017 unsigned NumDesignators : 15; 2018 2019 /// \brief The designators in this designated initialization 2020 /// expression. 2021 Designator *Designators; 2022 2023 /// The number of subexpressions of this initializer expression, 2024 /// which contains both the initializer and any additional 2025 /// expressions used by array and array-range designators. 2026 unsigned NumSubExprs : 16; 2027 2028 2029 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2030 const Designator *Designators, 2031 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2032 unsigned NumSubExprs); 2033 2034public: 2035 /// A field designator, e.g., ".x". 2036 struct FieldDesignator { 2037 /// Refers to the field that is being initialized. The low bit 2038 /// of this field determines whether this is actually a pointer 2039 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2040 /// initially constructed, a field designator will store an 2041 /// IdentifierInfo*. After semantic analysis has resolved that 2042 /// name, the field designator will instead store a FieldDecl*. 2043 uintptr_t NameOrField; 2044 2045 /// The location of the '.' in the designated initializer. 2046 unsigned DotLoc; 2047 2048 /// The location of the field name in the designated initializer. 2049 unsigned FieldLoc; 2050 }; 2051 2052 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2053 struct ArrayOrRangeDesignator { 2054 /// Location of the first index expression within the designated 2055 /// initializer expression's list of subexpressions. 2056 unsigned Index; 2057 /// The location of the '[' starting the array range designator. 2058 unsigned LBracketLoc; 2059 /// The location of the ellipsis separating the start and end 2060 /// indices. Only valid for GNU array-range designators. 2061 unsigned EllipsisLoc; 2062 /// The location of the ']' terminating the array range designator. 2063 unsigned RBracketLoc; 2064 }; 2065 2066 /// @brief Represents a single C99 designator. 2067 /// 2068 /// @todo This class is infuriatingly similar to clang::Designator, 2069 /// but minor differences (storing indices vs. storing pointers) 2070 /// keep us from reusing it. Try harder, later, to rectify these 2071 /// differences. 2072 class Designator { 2073 /// @brief The kind of designator this describes. 2074 enum { 2075 FieldDesignator, 2076 ArrayDesignator, 2077 ArrayRangeDesignator 2078 } Kind; 2079 2080 union { 2081 /// A field designator, e.g., ".x". 2082 struct FieldDesignator Field; 2083 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2084 struct ArrayOrRangeDesignator ArrayOrRange; 2085 }; 2086 friend class DesignatedInitExpr; 2087 2088 public: 2089 Designator() {} 2090 2091 /// @brief Initializes a field designator. 2092 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2093 SourceLocation FieldLoc) 2094 : Kind(FieldDesignator) { 2095 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2096 Field.DotLoc = DotLoc.getRawEncoding(); 2097 Field.FieldLoc = FieldLoc.getRawEncoding(); 2098 } 2099 2100 /// @brief Initializes an array designator. 2101 Designator(unsigned Index, SourceLocation LBracketLoc, 2102 SourceLocation RBracketLoc) 2103 : Kind(ArrayDesignator) { 2104 ArrayOrRange.Index = Index; 2105 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2106 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2107 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2108 } 2109 2110 /// @brief Initializes a GNU array-range designator. 2111 Designator(unsigned Index, SourceLocation LBracketLoc, 2112 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2113 : Kind(ArrayRangeDesignator) { 2114 ArrayOrRange.Index = Index; 2115 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2116 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2117 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2118 } 2119 2120 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2121 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2122 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2123 2124 IdentifierInfo * getFieldName(); 2125 2126 FieldDecl *getField() { 2127 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2128 if (Field.NameOrField & 0x01) 2129 return 0; 2130 else 2131 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2132 } 2133 2134 void setField(FieldDecl *FD) { 2135 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2136 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2137 } 2138 2139 SourceLocation getDotLoc() const { 2140 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2141 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2142 } 2143 2144 SourceLocation getFieldLoc() const { 2145 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2146 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2147 } 2148 2149 SourceLocation getLBracketLoc() const { 2150 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2151 "Only valid on an array or array-range designator"); 2152 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2153 } 2154 2155 SourceLocation getRBracketLoc() const { 2156 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2157 "Only valid on an array or array-range designator"); 2158 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2159 } 2160 2161 SourceLocation getEllipsisLoc() const { 2162 assert(Kind == ArrayRangeDesignator && 2163 "Only valid on an array-range designator"); 2164 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2165 } 2166 2167 SourceLocation getStartLocation() const { 2168 if (Kind == FieldDesignator) 2169 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2170 else 2171 return getLBracketLoc(); 2172 } 2173 }; 2174 2175 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2176 unsigned NumDesignators, 2177 Expr **IndexExprs, unsigned NumIndexExprs, 2178 SourceLocation EqualOrColonLoc, 2179 bool GNUSyntax, Expr *Init); 2180 2181 /// @brief Returns the number of designators in this initializer. 2182 unsigned size() const { return NumDesignators; } 2183 2184 // Iterator access to the designators. 2185 typedef Designator* designators_iterator; 2186 designators_iterator designators_begin() { return Designators; } 2187 designators_iterator designators_end() { 2188 return Designators + NumDesignators; 2189 } 2190 2191 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2192 2193 Expr *getArrayIndex(const Designator& D); 2194 Expr *getArrayRangeStart(const Designator& D); 2195 Expr *getArrayRangeEnd(const Designator& D); 2196 2197 /// @brief Retrieve the location of the '=' that precedes the 2198 /// initializer value itself, if present. 2199 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2200 2201 /// @brief Determines whether this designated initializer used the 2202 /// deprecated GNU syntax for designated initializers. 2203 bool usesGNUSyntax() const { return GNUSyntax; } 2204 2205 /// @brief Retrieve the initializer value. 2206 Expr *getInit() const { 2207 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2208 } 2209 2210 void setInit(Expr *init) { 2211 *child_begin() = init; 2212 } 2213 2214 /// \brief Replaces the designator at index @p Idx with the series 2215 /// of designators in [First, Last). 2216 void ExpandDesignator(unsigned Idx, const Designator *First, 2217 const Designator *Last); 2218 2219 virtual SourceRange getSourceRange() const; 2220 2221 virtual void Destroy(ASTContext &C); 2222 2223 static bool classof(const Stmt *T) { 2224 return T->getStmtClass() == DesignatedInitExprClass; 2225 } 2226 static bool classof(const DesignatedInitExpr *) { return true; } 2227 2228 // Iterators 2229 virtual child_iterator child_begin(); 2230 virtual child_iterator child_end(); 2231}; 2232 2233/// \brief Represents an implicitly-generated value initialization of 2234/// an object of a given type. 2235/// 2236/// Implicit value initializations occur within semantic initializer 2237/// list expressions (InitListExpr) as placeholders for subobject 2238/// initializations not explicitly specified by the user. 2239/// 2240/// \see InitListExpr 2241class ImplicitValueInitExpr : public Expr { 2242public: 2243 explicit ImplicitValueInitExpr(QualType ty) 2244 : Expr(ImplicitValueInitExprClass, ty) { } 2245 2246 static bool classof(const Stmt *T) { 2247 return T->getStmtClass() == ImplicitValueInitExprClass; 2248 } 2249 static bool classof(const ImplicitValueInitExpr *) { return true; } 2250 2251 virtual SourceRange getSourceRange() const { 2252 return SourceRange(); 2253 } 2254 2255 // Iterators 2256 virtual child_iterator child_begin(); 2257 virtual child_iterator child_end(); 2258}; 2259 2260//===----------------------------------------------------------------------===// 2261// Clang Extensions 2262//===----------------------------------------------------------------------===// 2263 2264 2265/// ExtVectorElementExpr - This represents access to specific elements of a 2266/// vector, and may occur on the left hand side or right hand side. For example 2267/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2268/// 2269/// Note that the base may have either vector or pointer to vector type, just 2270/// like a struct field reference. 2271/// 2272class ExtVectorElementExpr : public Expr { 2273 Stmt *Base; 2274 IdentifierInfo &Accessor; 2275 SourceLocation AccessorLoc; 2276public: 2277 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2278 SourceLocation loc) 2279 : Expr(ExtVectorElementExprClass, ty), 2280 Base(base), Accessor(accessor), AccessorLoc(loc) {} 2281 2282 const Expr *getBase() const { return cast<Expr>(Base); } 2283 Expr *getBase() { return cast<Expr>(Base); } 2284 2285 IdentifierInfo &getAccessor() const { return Accessor; } 2286 2287 /// getNumElements - Get the number of components being selected. 2288 unsigned getNumElements() const; 2289 2290 /// containsDuplicateElements - Return true if any element access is 2291 /// repeated. 2292 bool containsDuplicateElements() const; 2293 2294 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2295 /// aggregate Constant of ConstantInt(s). 2296 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2297 2298 virtual SourceRange getSourceRange() const { 2299 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2300 } 2301 2302 /// isArrow - Return true if the base expression is a pointer to vector, 2303 /// return false if the base expression is a vector. 2304 bool isArrow() const; 2305 2306 static bool classof(const Stmt *T) { 2307 return T->getStmtClass() == ExtVectorElementExprClass; 2308 } 2309 static bool classof(const ExtVectorElementExpr *) { return true; } 2310 2311 // Iterators 2312 virtual child_iterator child_begin(); 2313 virtual child_iterator child_end(); 2314 2315 virtual void EmitImpl(llvm::Serializer& S) const; 2316 static ExtVectorElementExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2317}; 2318 2319 2320/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2321/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2322class BlockExpr : public Expr { 2323protected: 2324 BlockDecl *TheBlock; 2325 bool HasBlockDeclRefExprs; 2326public: 2327 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2328 : Expr(BlockExprClass, ty), 2329 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2330 2331 const BlockDecl *getBlockDecl() const { return TheBlock; } 2332 BlockDecl *getBlockDecl() { return TheBlock; } 2333 2334 // Convenience functions for probing the underlying BlockDecl. 2335 SourceLocation getCaretLocation() const; 2336 const Stmt *getBody() const; 2337 Stmt *getBody(); 2338 2339 virtual SourceRange getSourceRange() const { 2340 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2341 } 2342 2343 /// getFunctionType - Return the underlying function type for this block. 2344 const FunctionType *getFunctionType() const; 2345 2346 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2347 /// contained inside. 2348 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2349 2350 static bool classof(const Stmt *T) { 2351 return T->getStmtClass() == BlockExprClass; 2352 } 2353 static bool classof(const BlockExpr *) { return true; } 2354 2355 // Iterators 2356 virtual child_iterator child_begin(); 2357 virtual child_iterator child_end(); 2358 2359 virtual void EmitImpl(llvm::Serializer& S) const; 2360 static BlockExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2361}; 2362 2363/// BlockDeclRefExpr - A reference to a declared variable, function, 2364/// enum, etc. 2365class BlockDeclRefExpr : public Expr { 2366 ValueDecl *D; 2367 SourceLocation Loc; 2368 bool IsByRef; 2369public: 2370 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2371 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2372 2373 ValueDecl *getDecl() { return D; } 2374 const ValueDecl *getDecl() const { return D; } 2375 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2376 2377 bool isByRef() const { return IsByRef; } 2378 2379 static bool classof(const Stmt *T) { 2380 return T->getStmtClass() == BlockDeclRefExprClass; 2381 } 2382 static bool classof(const BlockDeclRefExpr *) { return true; } 2383 2384 // Iterators 2385 virtual child_iterator child_begin(); 2386 virtual child_iterator child_end(); 2387 2388 virtual void EmitImpl(llvm::Serializer& S) const; 2389 static BlockDeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2390}; 2391 2392} // end namespace clang 2393 2394#endif 2395