Expr.h revision 76458501a8963fa11b91c9337a487de6871169b4
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 /// - b ? x : y, where x and y are lvalues of suitable types [C++] 140 /// 141 enum isLvalueResult { 142 LV_Valid, 143 LV_NotObjectType, 144 LV_IncompleteVoidType, 145 LV_DuplicateVectorComponents, 146 LV_InvalidExpression, 147 LV_MemberFunction 148 }; 149 isLvalueResult isLvalue(ASTContext &Ctx) const; 150 151 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 152 /// does not have an incomplete type, does not have a const-qualified type, 153 /// and if it is a structure or union, does not have any member (including, 154 /// recursively, any member or element of all contained aggregates or unions) 155 /// with a const-qualified type. 156 /// 157 /// \param Loc [in] [out] - A source location which *may* be filled 158 /// in with the location of the expression making this a 159 /// non-modifiable lvalue, if specified. 160 enum isModifiableLvalueResult { 161 MLV_Valid, 162 MLV_NotObjectType, 163 MLV_IncompleteVoidType, 164 MLV_DuplicateVectorComponents, 165 MLV_InvalidExpression, 166 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 167 MLV_IncompleteType, 168 MLV_ConstQualified, 169 MLV_ArrayType, 170 MLV_NotBlockQualified, 171 MLV_ReadonlyProperty, 172 MLV_NoSetterProperty, 173 MLV_MemberFunction 174 }; 175 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 176 SourceLocation *Loc = 0) const; 177 178 bool isBitField(); 179 180 /// getIntegerConstantExprValue() - Return the value of an integer 181 /// constant expression. The expression must be a valid integer 182 /// constant expression as determined by isIntegerConstantExpr. 183 llvm::APSInt getIntegerConstantExprValue(ASTContext &Ctx) const { 184 llvm::APSInt X; 185 bool success = isIntegerConstantExpr(X, Ctx); 186 success = success; 187 assert(success && "Illegal argument to getIntegerConstantExpr"); 188 return X; 189 } 190 191 /// isIntegerConstantExpr - Return true if this expression is a valid integer 192 /// constant expression, and, if so, return its value in Result. If not a 193 /// valid i-c-e, return false and fill in Loc (if specified) with the location 194 /// of the invalid expression. 195 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 196 SourceLocation *Loc = 0, 197 bool isEvaluated = true) const; 198 bool isIntegerConstantExprInternal(llvm::APSInt &Result, ASTContext &Ctx, 199 SourceLocation *Loc = 0, 200 bool isEvaluated = true) const; 201 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 202 llvm::APSInt X; 203 return isIntegerConstantExpr(X, Ctx, Loc); 204 } 205 /// isConstantInitializer - Returns true if this expression is a constant 206 /// initializer, which can be emitted at compile-time. 207 bool isConstantInitializer(ASTContext &Ctx) const; 208 209 /// EvalResult is a struct with detailed info about an evaluated expression. 210 struct EvalResult { 211 /// Val - This is the value the expression can be folded to. 212 APValue Val; 213 214 /// HasSideEffects - Whether the evaluated expression has side effects. 215 /// For example, (f() && 0) can be folded, but it still has side effects. 216 bool HasSideEffects; 217 218 /// Diag - If the expression is unfoldable, then Diag contains a note 219 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 220 /// position for the error, and DiagExpr is the expression that caused 221 /// the error. 222 /// If the expression is foldable, but not an integer constant expression, 223 /// Diag contains a note diagnostic that describes why it isn't an integer 224 /// constant expression. If the expression *is* an integer constant 225 /// expression, then Diag will be zero. 226 unsigned Diag; 227 const Expr *DiagExpr; 228 SourceLocation DiagLoc; 229 230 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 231 }; 232 233 /// Evaluate - Return true if this is a constant which we can fold using 234 /// any crazy technique (that has nothing to do with language standards) that 235 /// we want to. If this function returns true, it returns the folded constant 236 /// in Result. 237 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 238 239 /// isEvaluatable - Call Evaluate to see if this expression can be constant 240 /// folded, but discard the result. 241 bool isEvaluatable(ASTContext &Ctx) const; 242 243 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 244 /// must be called on an expression that constant folds to an integer. 245 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 246 247 /// EvaluateAsLValue - Evaluate an expression to see if it's a valid LValue. 248 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 249 250 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 251 /// integer constant expression with the value zero, or if this is one that is 252 /// cast to void*. 253 bool isNullPointerConstant(ASTContext &Ctx) const; 254 255 /// hasGlobalStorage - Return true if this expression has static storage 256 /// duration. This means that the address of this expression is a link-time 257 /// constant. 258 bool hasGlobalStorage() const; 259 260 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 261 /// write barrier. 262 bool isOBJCGCCandidate() const; 263 264 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 265 /// its subexpression. If that subexpression is also a ParenExpr, 266 /// then this method recursively returns its subexpression, and so forth. 267 /// Otherwise, the method returns the current Expr. 268 Expr* IgnoreParens(); 269 270 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 271 /// or CastExprs, returning their operand. 272 Expr *IgnoreParenCasts(); 273 274 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 275 /// value (including ptr->int casts of the same size). Strip off any 276 /// ParenExpr or CastExprs, returning their operand. 277 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 278 279 const Expr* IgnoreParens() const { 280 return const_cast<Expr*>(this)->IgnoreParens(); 281 } 282 const Expr *IgnoreParenCasts() const { 283 return const_cast<Expr*>(this)->IgnoreParenCasts(); 284 } 285 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 286 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 287 } 288 289 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 290 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 291 292 static bool classof(const Stmt *T) { 293 return T->getStmtClass() >= firstExprConstant && 294 T->getStmtClass() <= lastExprConstant; 295 } 296 static bool classof(const Expr *) { return true; } 297 298 static inline Expr* Create(llvm::Deserializer& D, ASTContext& C) { 299 return cast<Expr>(Stmt::Create(D, C)); 300 } 301}; 302 303 304//===----------------------------------------------------------------------===// 305// Primary Expressions. 306//===----------------------------------------------------------------------===// 307 308/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 309/// enum, etc. 310class DeclRefExpr : public Expr { 311 NamedDecl *D; 312 SourceLocation Loc; 313 314protected: 315 // FIXME: Eventually, this constructor will go away and all subclasses 316 // will have to provide the type- and value-dependent flags. 317 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 318 Expr(SC, t), D(d), Loc(l) {} 319 320 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 321 bool VD) : 322 Expr(SC, t, TD, VD), D(d), Loc(l) {} 323 324public: 325 // FIXME: Eventually, this constructor will go away and all clients 326 // will have to provide the type- and value-dependent flags. 327 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 328 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 329 330 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 331 Expr(DeclRefExprClass, t, TD, VD), D(d), Loc(l) {} 332 333 /// \brief Construct an empty declaration reference expression. 334 explicit DeclRefExpr(EmptyShell Empty) 335 : Expr(DeclRefExprClass, Empty) { } 336 337 NamedDecl *getDecl() { return D; } 338 const NamedDecl *getDecl() const { return D; } 339 void setDecl(NamedDecl *NewD) { D = NewD; } 340 341 SourceLocation getLocation() const { return Loc; } 342 void setLocation(SourceLocation L) { Loc = L; } 343 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 344 345 static bool classof(const Stmt *T) { 346 return T->getStmtClass() == DeclRefExprClass || 347 T->getStmtClass() == CXXConditionDeclExprClass || 348 T->getStmtClass() == QualifiedDeclRefExprClass; 349 } 350 static bool classof(const DeclRefExpr *) { return true; } 351 352 // Iterators 353 virtual child_iterator child_begin(); 354 virtual child_iterator child_end(); 355 356 virtual void EmitImpl(llvm::Serializer& S) const; 357 static DeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 358}; 359 360/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 361class PredefinedExpr : public Expr { 362public: 363 enum IdentType { 364 Func, 365 Function, 366 PrettyFunction 367 }; 368 369private: 370 SourceLocation Loc; 371 IdentType Type; 372public: 373 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 374 : Expr(PredefinedExprClass, type), Loc(l), Type(IT) {} 375 376 /// \brief Construct an empty predefined expression. 377 explicit PredefinedExpr(EmptyShell Empty) 378 : Expr(PredefinedExprClass, Empty) { } 379 380 IdentType getIdentType() const { return Type; } 381 void setIdentType(IdentType IT) { Type = IT; } 382 383 SourceLocation getLocation() const { return Loc; } 384 void setLocation(SourceLocation L) { Loc = L; } 385 386 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 387 388 static bool classof(const Stmt *T) { 389 return T->getStmtClass() == PredefinedExprClass; 390 } 391 static bool classof(const PredefinedExpr *) { return true; } 392 393 // Iterators 394 virtual child_iterator child_begin(); 395 virtual child_iterator child_end(); 396 397 virtual void EmitImpl(llvm::Serializer& S) const; 398 static PredefinedExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 399}; 400 401class IntegerLiteral : public Expr { 402 llvm::APInt Value; 403 SourceLocation Loc; 404public: 405 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 406 // or UnsignedLongLongTy 407 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 408 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 409 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 410 } 411 412 /// \brief Construct an empty integer literal. 413 explicit IntegerLiteral(EmptyShell Empty) 414 : Expr(IntegerLiteralClass, Empty) { } 415 416 IntegerLiteral* Clone(ASTContext &C) const; 417 418 const llvm::APInt &getValue() const { return Value; } 419 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 420 421 /// \brief Retrieve the location of the literal. 422 SourceLocation getLocation() const { return Loc; } 423 424 void setValue(const llvm::APInt &Val) { Value = Val; } 425 void setLocation(SourceLocation Location) { Loc = Location; } 426 427 static bool classof(const Stmt *T) { 428 return T->getStmtClass() == IntegerLiteralClass; 429 } 430 static bool classof(const IntegerLiteral *) { return true; } 431 432 // Iterators 433 virtual child_iterator child_begin(); 434 virtual child_iterator child_end(); 435 436 virtual void EmitImpl(llvm::Serializer& S) const; 437 static IntegerLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 438}; 439 440class CharacterLiteral : public Expr { 441 unsigned Value; 442 SourceLocation Loc; 443 bool IsWide; 444public: 445 // type should be IntTy 446 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 447 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 448 } 449 450 /// \brief Construct an empty character literal. 451 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 452 453 SourceLocation getLoc() const { return Loc; } 454 bool isWide() const { return IsWide; } 455 456 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 457 458 unsigned getValue() const { return Value; } 459 460 void setLocation(SourceLocation Location) { Loc = Location; } 461 void setWide(bool W) { IsWide = W; } 462 void setValue(unsigned Val) { Value = Val; } 463 464 static bool classof(const Stmt *T) { 465 return T->getStmtClass() == CharacterLiteralClass; 466 } 467 static bool classof(const CharacterLiteral *) { return true; } 468 469 // Iterators 470 virtual child_iterator child_begin(); 471 virtual child_iterator child_end(); 472 473 virtual void EmitImpl(llvm::Serializer& S) const; 474 static CharacterLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 475}; 476 477class FloatingLiteral : public Expr { 478 llvm::APFloat Value; 479 bool IsExact : 1; 480 SourceLocation Loc; 481public: 482 FloatingLiteral(const llvm::APFloat &V, bool* isexact, 483 QualType Type, SourceLocation L) 484 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(*isexact), Loc(L) {} 485 486 /// \brief Construct an empty floating-point literal. 487 FloatingLiteral(EmptyShell Empty) 488 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 489 490 const llvm::APFloat &getValue() const { return Value; } 491 void setValue(const llvm::APFloat &Val) { Value = Val; } 492 493 bool isExact() const { return IsExact; } 494 void setExact(bool E) { IsExact = E; } 495 496 /// getValueAsApproximateDouble - This returns the value as an inaccurate 497 /// double. Note that this may cause loss of precision, but is useful for 498 /// debugging dumps, etc. 499 double getValueAsApproximateDouble() const; 500 501 SourceLocation getLocation() const { return Loc; } 502 void setLocation(SourceLocation L) { Loc = L; } 503 504 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 505 506 static bool classof(const Stmt *T) { 507 return T->getStmtClass() == FloatingLiteralClass; 508 } 509 static bool classof(const FloatingLiteral *) { return true; } 510 511 // Iterators 512 virtual child_iterator child_begin(); 513 virtual child_iterator child_end(); 514 515 virtual void EmitImpl(llvm::Serializer& S) const; 516 static FloatingLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 517}; 518 519/// ImaginaryLiteral - We support imaginary integer and floating point literals, 520/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 521/// IntegerLiteral classes. Instances of this class always have a Complex type 522/// whose element type matches the subexpression. 523/// 524class ImaginaryLiteral : public Expr { 525 Stmt *Val; 526public: 527 ImaginaryLiteral(Expr *val, QualType Ty) 528 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 529 530 /// \brief Build an empty imaginary literal. 531 explicit ImaginaryLiteral(EmptyShell Empty) 532 : Expr(ImaginaryLiteralClass, Empty) { } 533 534 const Expr *getSubExpr() const { return cast<Expr>(Val); } 535 Expr *getSubExpr() { return cast<Expr>(Val); } 536 void setSubExpr(Expr *E) { Val = E; } 537 538 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 539 static bool classof(const Stmt *T) { 540 return T->getStmtClass() == ImaginaryLiteralClass; 541 } 542 static bool classof(const ImaginaryLiteral *) { return true; } 543 544 // Iterators 545 virtual child_iterator child_begin(); 546 virtual child_iterator child_end(); 547 548 virtual void EmitImpl(llvm::Serializer& S) const; 549 static ImaginaryLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 550}; 551 552/// StringLiteral - This represents a string literal expression, e.g. "foo" 553/// or L"bar" (wide strings). The actual string is returned by getStrData() 554/// is NOT null-terminated, and the length of the string is determined by 555/// calling getByteLength(). The C type for a string is always a 556/// ConstantArrayType. In C++, the char type is const qualified, in C it is 557/// not. 558/// 559/// Note that strings in C can be formed by concatenation of multiple string 560/// literal pptokens in translation phase #6. This keeps track of the locations 561/// of each of these pieces. 562/// 563/// Strings in C can also be truncated and extended by assigning into arrays, 564/// e.g. with constructs like: 565/// char X[2] = "foobar"; 566/// In this case, getByteLength() will return 6, but the string literal will 567/// have type "char[2]". 568class StringLiteral : public Expr { 569 const char *StrData; 570 unsigned ByteLength; 571 bool IsWide; 572 unsigned NumConcatenated; 573 SourceLocation TokLocs[1]; 574 575 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 576public: 577 /// This is the "fully general" constructor that allows representation of 578 /// strings formed from multiple concatenated tokens. 579 static StringLiteral *Create(ASTContext &C, const char *StrData, 580 unsigned ByteLength, bool Wide, QualType Ty, 581 const SourceLocation *Loc, unsigned NumStrs); 582 583 /// Simple constructor for string literals made from one token. 584 static StringLiteral *Create(ASTContext &C, const char *StrData, 585 unsigned ByteLength, 586 bool Wide, QualType Ty, SourceLocation Loc) { 587 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 588 } 589 590 /// \brief Construct an empty string literal. 591 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 592 593 StringLiteral* Clone(ASTContext &C) const; 594 void Destroy(ASTContext &C); 595 596 const char *getStrData() const { return StrData; } 597 unsigned getByteLength() const { return ByteLength; } 598 599 /// \brief Sets the string data to the given string data. 600 void setStrData(ASTContext &C, const char *Str, unsigned Len); 601 602 bool isWide() const { return IsWide; } 603 void setWide(bool W) { IsWide = W; } 604 605 bool containsNonAsciiOrNull() const { 606 for (unsigned i = 0; i < getByteLength(); ++i) 607 if (!isascii(getStrData()[i]) || !getStrData()[i]) 608 return true; 609 return false; 610 } 611 /// getNumConcatenated - Get the number of string literal tokens that were 612 /// concatenated in translation phase #6 to form this string literal. 613 unsigned getNumConcatenated() const { return NumConcatenated; } 614 615 SourceLocation getStrTokenLoc(unsigned TokNum) const { 616 assert(TokNum < NumConcatenated && "Invalid tok number"); 617 return TokLocs[TokNum]; 618 } 619 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 620 assert(TokNum < NumConcatenated && "Invalid tok number"); 621 TokLocs[TokNum] = L; 622 } 623 624 typedef const SourceLocation *tokloc_iterator; 625 tokloc_iterator tokloc_begin() const { return TokLocs; } 626 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 627 628 virtual SourceRange getSourceRange() const { 629 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 630 } 631 static bool classof(const Stmt *T) { 632 return T->getStmtClass() == StringLiteralClass; 633 } 634 static bool classof(const StringLiteral *) { return true; } 635 636 // Iterators 637 virtual child_iterator child_begin(); 638 virtual child_iterator child_end(); 639 640 virtual void EmitImpl(llvm::Serializer& S) const; 641 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 642}; 643 644/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 645/// AST node is only formed if full location information is requested. 646class ParenExpr : public Expr { 647 SourceLocation L, R; 648 Stmt *Val; 649public: 650 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 651 : Expr(ParenExprClass, val->getType(), 652 val->isTypeDependent(), val->isValueDependent()), 653 L(l), R(r), Val(val) {} 654 655 /// \brief Construct an empty parenthesized expression. 656 explicit ParenExpr(EmptyShell Empty) 657 : Expr(ParenExprClass, Empty) { } 658 659 const Expr *getSubExpr() const { return cast<Expr>(Val); } 660 Expr *getSubExpr() { return cast<Expr>(Val); } 661 void setSubExpr(Expr *E) { Val = E; } 662 663 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 664 665 /// \brief Get the location of the left parentheses '('. 666 SourceLocation getLParen() const { return L; } 667 void setLParen(SourceLocation Loc) { L = Loc; } 668 669 /// \brief Get the location of the right parentheses ')'. 670 SourceLocation getRParen() const { return R; } 671 void setRParen(SourceLocation Loc) { R = Loc; } 672 673 static bool classof(const Stmt *T) { 674 return T->getStmtClass() == ParenExprClass; 675 } 676 static bool classof(const ParenExpr *) { return true; } 677 678 // Iterators 679 virtual child_iterator child_begin(); 680 virtual child_iterator child_end(); 681 682 virtual void EmitImpl(llvm::Serializer& S) const; 683 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 684}; 685 686 687/// UnaryOperator - This represents the unary-expression's (except sizeof and 688/// alignof), the postinc/postdec operators from postfix-expression, and various 689/// extensions. 690/// 691/// Notes on various nodes: 692/// 693/// Real/Imag - These return the real/imag part of a complex operand. If 694/// applied to a non-complex value, the former returns its operand and the 695/// later returns zero in the type of the operand. 696/// 697/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 698/// subexpression is a compound literal with the various MemberExpr and 699/// ArraySubscriptExpr's applied to it. 700/// 701class UnaryOperator : public Expr { 702public: 703 // Note that additions to this should also update the StmtVisitor class. 704 enum Opcode { 705 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 706 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 707 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 708 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 709 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 710 Real, Imag, // "__real expr"/"__imag expr" Extension. 711 Extension, // __extension__ marker. 712 OffsetOf // __builtin_offsetof 713 }; 714private: 715 Stmt *Val; 716 Opcode Opc; 717 SourceLocation Loc; 718public: 719 720 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 721 : Expr(UnaryOperatorClass, type, 722 input->isTypeDependent() && opc != OffsetOf, 723 input->isValueDependent()), 724 Val(input), Opc(opc), Loc(l) {} 725 726 /// \brief Build an empty unary operator. 727 explicit UnaryOperator(EmptyShell Empty) 728 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 729 730 Opcode getOpcode() const { return Opc; } 731 void setOpcode(Opcode O) { Opc = O; } 732 733 Expr *getSubExpr() const { return cast<Expr>(Val); } 734 void setSubExpr(Expr *E) { Val = E; } 735 736 /// getOperatorLoc - Return the location of the operator. 737 SourceLocation getOperatorLoc() const { return Loc; } 738 void setOperatorLoc(SourceLocation L) { Loc = L; } 739 740 /// isPostfix - Return true if this is a postfix operation, like x++. 741 static bool isPostfix(Opcode Op) { 742 return Op == PostInc || Op == PostDec; 743 } 744 745 /// isPostfix - Return true if this is a prefix operation, like --x. 746 static bool isPrefix(Opcode Op) { 747 return Op == PreInc || Op == PreDec; 748 } 749 750 bool isPrefix() const { return isPrefix(Opc); } 751 bool isPostfix() const { return isPostfix(Opc); } 752 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 753 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 754 bool isOffsetOfOp() const { return Opc == OffsetOf; } 755 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 756 757 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 758 /// corresponds to, e.g. "sizeof" or "[pre]++" 759 static const char *getOpcodeStr(Opcode Op); 760 761 /// \brief Retrieve the unary opcode that corresponds to the given 762 /// overloaded operator. 763 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 764 765 /// \brief Retrieve the overloaded operator kind that corresponds to 766 /// the given unary opcode. 767 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 768 769 virtual SourceRange getSourceRange() const { 770 if (isPostfix()) 771 return SourceRange(Val->getLocStart(), Loc); 772 else 773 return SourceRange(Loc, Val->getLocEnd()); 774 } 775 virtual SourceLocation getExprLoc() const { return Loc; } 776 777 static bool classof(const Stmt *T) { 778 return T->getStmtClass() == UnaryOperatorClass; 779 } 780 static bool classof(const UnaryOperator *) { return true; } 781 782 // Iterators 783 virtual child_iterator child_begin(); 784 virtual child_iterator child_end(); 785 786 virtual void EmitImpl(llvm::Serializer& S) const; 787 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 788}; 789 790/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 791/// types and expressions. 792class SizeOfAlignOfExpr : public Expr { 793 bool isSizeof : 1; // true if sizeof, false if alignof. 794 bool isType : 1; // true if operand is a type, false if an expression 795 union { 796 void *Ty; 797 Stmt *Ex; 798 } Argument; 799 SourceLocation OpLoc, RParenLoc; 800public: 801 SizeOfAlignOfExpr(bool issizeof, QualType T, 802 QualType resultType, SourceLocation op, 803 SourceLocation rp) : 804 Expr(SizeOfAlignOfExprClass, resultType, 805 false, // Never type-dependent (C++ [temp.dep.expr]p3). 806 // Value-dependent if the argument is type-dependent. 807 T->isDependentType()), 808 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 809 Argument.Ty = T.getAsOpaquePtr(); 810 } 811 812 SizeOfAlignOfExpr(bool issizeof, Expr *E, 813 QualType resultType, SourceLocation op, 814 SourceLocation rp) : 815 Expr(SizeOfAlignOfExprClass, resultType, 816 false, // Never type-dependent (C++ [temp.dep.expr]p3). 817 // Value-dependent if the argument is type-dependent. 818 E->isTypeDependent()), 819 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 820 Argument.Ex = E; 821 } 822 823 /// \brief Construct an empty sizeof/alignof expression. 824 explicit SizeOfAlignOfExpr(EmptyShell Empty) 825 : Expr(SizeOfAlignOfExprClass, Empty) { } 826 827 virtual void Destroy(ASTContext& C); 828 829 bool isSizeOf() const { return isSizeof; } 830 void setSizeof(bool S) { isSizeof = S; } 831 832 bool isArgumentType() const { return isType; } 833 QualType getArgumentType() const { 834 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 835 return QualType::getFromOpaquePtr(Argument.Ty); 836 } 837 Expr *getArgumentExpr() { 838 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 839 return static_cast<Expr*>(Argument.Ex); 840 } 841 const Expr *getArgumentExpr() const { 842 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 843 } 844 845 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 846 void setArgument(QualType T) { 847 Argument.Ty = T.getAsOpaquePtr(); 848 isType = true; 849 } 850 851 /// Gets the argument type, or the type of the argument expression, whichever 852 /// is appropriate. 853 QualType getTypeOfArgument() const { 854 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 855 } 856 857 SourceLocation getOperatorLoc() const { return OpLoc; } 858 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 859 860 SourceLocation getRParenLoc() const { return RParenLoc; } 861 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 862 863 virtual SourceRange getSourceRange() const { 864 return SourceRange(OpLoc, RParenLoc); 865 } 866 867 static bool classof(const Stmt *T) { 868 return T->getStmtClass() == SizeOfAlignOfExprClass; 869 } 870 static bool classof(const SizeOfAlignOfExpr *) { return true; } 871 872 // Iterators 873 virtual child_iterator child_begin(); 874 virtual child_iterator child_end(); 875 876 virtual void EmitImpl(llvm::Serializer& S) const; 877 static SizeOfAlignOfExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 878}; 879 880//===----------------------------------------------------------------------===// 881// Postfix Operators. 882//===----------------------------------------------------------------------===// 883 884/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 885class ArraySubscriptExpr : public Expr { 886 enum { LHS, RHS, END_EXPR=2 }; 887 Stmt* SubExprs[END_EXPR]; 888 SourceLocation RBracketLoc; 889public: 890 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 891 SourceLocation rbracketloc) 892 : Expr(ArraySubscriptExprClass, t, 893 lhs->isTypeDependent() || rhs->isTypeDependent(), 894 lhs->isValueDependent() || rhs->isValueDependent()), 895 RBracketLoc(rbracketloc) { 896 SubExprs[LHS] = lhs; 897 SubExprs[RHS] = rhs; 898 } 899 900 /// \brief Create an empty array subscript expression. 901 explicit ArraySubscriptExpr(EmptyShell Shell) 902 : Expr(ArraySubscriptExprClass, Shell) { } 903 904 /// An array access can be written A[4] or 4[A] (both are equivalent). 905 /// - getBase() and getIdx() always present the normalized view: A[4]. 906 /// In this case getBase() returns "A" and getIdx() returns "4". 907 /// - getLHS() and getRHS() present the syntactic view. e.g. for 908 /// 4[A] getLHS() returns "4". 909 /// Note: Because vector element access is also written A[4] we must 910 /// predicate the format conversion in getBase and getIdx only on the 911 /// the type of the RHS, as it is possible for the LHS to be a vector of 912 /// integer type 913 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 914 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 915 void setLHS(Expr *E) { SubExprs[LHS] = E; } 916 917 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 918 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 919 void setRHS(Expr *E) { SubExprs[RHS] = E; } 920 921 Expr *getBase() { 922 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 923 } 924 925 const Expr *getBase() const { 926 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 927 } 928 929 Expr *getIdx() { 930 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 931 } 932 933 const Expr *getIdx() const { 934 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 935 } 936 937 virtual SourceRange getSourceRange() const { 938 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 939 } 940 941 SourceLocation getRBracketLoc() const { return RBracketLoc; } 942 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 943 944 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 945 946 static bool classof(const Stmt *T) { 947 return T->getStmtClass() == ArraySubscriptExprClass; 948 } 949 static bool classof(const ArraySubscriptExpr *) { return true; } 950 951 // Iterators 952 virtual child_iterator child_begin(); 953 virtual child_iterator child_end(); 954 955 virtual void EmitImpl(llvm::Serializer& S) const; 956 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 957}; 958 959 960/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 961/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 962/// while its subclasses may represent alternative syntax that (semantically) 963/// results in a function call. For example, CXXOperatorCallExpr is 964/// a subclass for overloaded operator calls that use operator syntax, e.g., 965/// "str1 + str2" to resolve to a function call. 966class CallExpr : public Expr { 967 enum { FN=0, ARGS_START=1 }; 968 Stmt **SubExprs; 969 unsigned NumArgs; 970 SourceLocation RParenLoc; 971 972 // This version of the ctor is for deserialization. 973 CallExpr(StmtClass SC, Stmt** subexprs, unsigned numargs, QualType t, 974 SourceLocation rparenloc) 975 : Expr(SC,t), SubExprs(subexprs), 976 NumArgs(numargs), RParenLoc(rparenloc) {} 977 978protected: 979 // This version of the constructor is for derived classes. 980 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 981 QualType t, SourceLocation rparenloc); 982 983public: 984 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 985 SourceLocation rparenloc); 986 987 /// \brief Build an empty call expression. 988 CallExpr(ASTContext &C, EmptyShell Empty); 989 990 ~CallExpr() {} 991 992 void Destroy(ASTContext& C); 993 994 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 995 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 996 void setCallee(Expr *F) { SubExprs[FN] = F; } 997 998 /// getNumArgs - Return the number of actual arguments to this call. 999 /// 1000 unsigned getNumArgs() const { return NumArgs; } 1001 1002 /// getArg - Return the specified argument. 1003 Expr *getArg(unsigned Arg) { 1004 assert(Arg < NumArgs && "Arg access out of range!"); 1005 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1006 } 1007 const Expr *getArg(unsigned Arg) const { 1008 assert(Arg < NumArgs && "Arg access out of range!"); 1009 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1010 } 1011 1012 /// setArg - Set the specified argument. 1013 void setArg(unsigned Arg, Expr *ArgExpr) { 1014 assert(Arg < NumArgs && "Arg access out of range!"); 1015 SubExprs[Arg+ARGS_START] = ArgExpr; 1016 } 1017 1018 /// setNumArgs - This changes the number of arguments present in this call. 1019 /// Any orphaned expressions are deleted by this, and any new operands are set 1020 /// to null. 1021 void setNumArgs(ASTContext& C, unsigned NumArgs); 1022 1023 typedef ExprIterator arg_iterator; 1024 typedef ConstExprIterator const_arg_iterator; 1025 1026 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1027 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1028 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1029 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1030 1031 /// getNumCommas - Return the number of commas that must have been present in 1032 /// this function call. 1033 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1034 1035 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1036 /// not, return 0. 1037 unsigned isBuiltinCall(ASTContext &Context) const; 1038 1039 SourceLocation getRParenLoc() const { return RParenLoc; } 1040 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1041 1042 virtual SourceRange getSourceRange() const { 1043 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1044 } 1045 1046 static bool classof(const Stmt *T) { 1047 return T->getStmtClass() == CallExprClass || 1048 T->getStmtClass() == CXXOperatorCallExprClass || 1049 T->getStmtClass() == CXXMemberCallExprClass; 1050 } 1051 static bool classof(const CallExpr *) { return true; } 1052 static bool classof(const CXXOperatorCallExpr *) { return true; } 1053 static bool classof(const CXXMemberCallExpr *) { return true; } 1054 1055 // Iterators 1056 virtual child_iterator child_begin(); 1057 virtual child_iterator child_end(); 1058 1059 virtual void EmitImpl(llvm::Serializer& S) const; 1060 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C, 1061 StmtClass SC); 1062}; 1063 1064/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1065/// 1066class MemberExpr : public Expr { 1067 /// Base - the expression for the base pointer or structure references. In 1068 /// X.F, this is "X". 1069 Stmt *Base; 1070 1071 /// MemberDecl - This is the decl being referenced by the field/member name. 1072 /// In X.F, this is the decl referenced by F. 1073 NamedDecl *MemberDecl; 1074 1075 /// MemberLoc - This is the location of the member name. 1076 SourceLocation MemberLoc; 1077 1078 /// IsArrow - True if this is "X->F", false if this is "X.F". 1079 bool IsArrow; 1080public: 1081 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1082 QualType ty) 1083 : Expr(MemberExprClass, ty), 1084 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 1085 1086 /// \brief Build an empty member reference expression. 1087 explicit MemberExpr(EmptyShell Empty) : Expr(MemberExprClass, Empty) { } 1088 1089 void setBase(Expr *E) { Base = E; } 1090 Expr *getBase() const { return cast<Expr>(Base); } 1091 1092 /// \brief Retrieve the member declaration to which this expression refers. 1093 /// 1094 /// The returned declaration will either be a FieldDecl or (in C++) 1095 /// a CXXMethodDecl. 1096 NamedDecl *getMemberDecl() const { return MemberDecl; } 1097 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1098 1099 bool isArrow() const { return IsArrow; } 1100 void setArrow(bool A) { IsArrow = A; } 1101 1102 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1103 /// location of 'F'. 1104 SourceLocation getMemberLoc() const { return MemberLoc; } 1105 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1106 1107 virtual SourceRange getSourceRange() const { 1108 return SourceRange(getBase()->getLocStart(), MemberLoc); 1109 } 1110 1111 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1112 1113 static bool classof(const Stmt *T) { 1114 return T->getStmtClass() == MemberExprClass; 1115 } 1116 static bool classof(const MemberExpr *) { return true; } 1117 1118 // Iterators 1119 virtual child_iterator child_begin(); 1120 virtual child_iterator child_end(); 1121 1122 virtual void EmitImpl(llvm::Serializer& S) const; 1123 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1124}; 1125 1126/// CompoundLiteralExpr - [C99 6.5.2.5] 1127/// 1128class CompoundLiteralExpr : public Expr { 1129 /// LParenLoc - If non-null, this is the location of the left paren in a 1130 /// compound literal like "(int){4}". This can be null if this is a 1131 /// synthesized compound expression. 1132 SourceLocation LParenLoc; 1133 Stmt *Init; 1134 bool FileScope; 1135public: 1136 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1137 bool fileScope) 1138 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1139 FileScope(fileScope) {} 1140 1141 /// \brief Construct an empty compound literal. 1142 explicit CompoundLiteralExpr(EmptyShell Empty) 1143 : Expr(CompoundLiteralExprClass, Empty) { } 1144 1145 const Expr *getInitializer() const { return cast<Expr>(Init); } 1146 Expr *getInitializer() { return cast<Expr>(Init); } 1147 void setInitializer(Expr *E) { Init = E; } 1148 1149 bool isFileScope() const { return FileScope; } 1150 void setFileScope(bool FS) { FileScope = FS; } 1151 1152 SourceLocation getLParenLoc() const { return LParenLoc; } 1153 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1154 1155 virtual SourceRange getSourceRange() const { 1156 // FIXME: Init should never be null. 1157 if (!Init) 1158 return SourceRange(); 1159 if (LParenLoc.isInvalid()) 1160 return Init->getSourceRange(); 1161 return SourceRange(LParenLoc, Init->getLocEnd()); 1162 } 1163 1164 static bool classof(const Stmt *T) { 1165 return T->getStmtClass() == CompoundLiteralExprClass; 1166 } 1167 static bool classof(const CompoundLiteralExpr *) { return true; } 1168 1169 // Iterators 1170 virtual child_iterator child_begin(); 1171 virtual child_iterator child_end(); 1172 1173 virtual void EmitImpl(llvm::Serializer& S) const; 1174 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1175}; 1176 1177/// CastExpr - Base class for type casts, including both implicit 1178/// casts (ImplicitCastExpr) and explicit casts that have some 1179/// representation in the source code (ExplicitCastExpr's derived 1180/// classes). 1181class CastExpr : public Expr { 1182 Stmt *Op; 1183protected: 1184 CastExpr(StmtClass SC, QualType ty, Expr *op) : 1185 Expr(SC, ty, 1186 // Cast expressions are type-dependent if the type is 1187 // dependent (C++ [temp.dep.expr]p3). 1188 ty->isDependentType(), 1189 // Cast expressions are value-dependent if the type is 1190 // dependent or if the subexpression is value-dependent. 1191 ty->isDependentType() || (op && op->isValueDependent())), 1192 Op(op) {} 1193 1194 /// \brief Construct an empty cast. 1195 CastExpr(StmtClass SC, EmptyShell Empty) 1196 : Expr(SC, Empty) { } 1197 1198public: 1199 Expr *getSubExpr() { return cast<Expr>(Op); } 1200 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1201 void setSubExpr(Expr *E) { Op = E; } 1202 1203 static bool classof(const Stmt *T) { 1204 StmtClass SC = T->getStmtClass(); 1205 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1206 return true; 1207 1208 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1209 return true; 1210 1211 return false; 1212 } 1213 static bool classof(const CastExpr *) { return true; } 1214 1215 // Iterators 1216 virtual child_iterator child_begin(); 1217 virtual child_iterator child_end(); 1218}; 1219 1220/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1221/// conversions, which have no direct representation in the original 1222/// source code. For example: converting T[]->T*, void f()->void 1223/// (*f)(), float->double, short->int, etc. 1224/// 1225/// In C, implicit casts always produce rvalues. However, in C++, an 1226/// implicit cast whose result is being bound to a reference will be 1227/// an lvalue. For example: 1228/// 1229/// @code 1230/// class Base { }; 1231/// class Derived : public Base { }; 1232/// void f(Derived d) { 1233/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1234/// } 1235/// @endcode 1236class ImplicitCastExpr : public CastExpr { 1237 /// LvalueCast - Whether this cast produces an lvalue. 1238 bool LvalueCast; 1239 1240public: 1241 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 1242 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 1243 1244 /// \brief Construct an empty implicit cast. 1245 explicit ImplicitCastExpr(EmptyShell Shell) 1246 : CastExpr(ImplicitCastExprClass, Shell) { } 1247 1248 1249 virtual SourceRange getSourceRange() const { 1250 return getSubExpr()->getSourceRange(); 1251 } 1252 1253 /// isLvalueCast - Whether this cast produces an lvalue. 1254 bool isLvalueCast() const { return LvalueCast; } 1255 1256 /// setLvalueCast - Set whether this cast produces an lvalue. 1257 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1258 1259 static bool classof(const Stmt *T) { 1260 return T->getStmtClass() == ImplicitCastExprClass; 1261 } 1262 static bool classof(const ImplicitCastExpr *) { return true; } 1263 1264 virtual void EmitImpl(llvm::Serializer& S) const; 1265 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1266}; 1267 1268/// ExplicitCastExpr - An explicit cast written in the source 1269/// code. 1270/// 1271/// This class is effectively an abstract class, because it provides 1272/// the basic representation of an explicitly-written cast without 1273/// specifying which kind of cast (C cast, functional cast, static 1274/// cast, etc.) was written; specific derived classes represent the 1275/// particular style of cast and its location information. 1276/// 1277/// Unlike implicit casts, explicit cast nodes have two different 1278/// types: the type that was written into the source code, and the 1279/// actual type of the expression as determined by semantic 1280/// analysis. These types may differ slightly. For example, in C++ one 1281/// can cast to a reference type, which indicates that the resulting 1282/// expression will be an lvalue. The reference type, however, will 1283/// not be used as the type of the expression. 1284class ExplicitCastExpr : public CastExpr { 1285 /// TypeAsWritten - The type that this expression is casting to, as 1286 /// written in the source code. 1287 QualType TypeAsWritten; 1288 1289protected: 1290 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1291 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1292 1293 /// \brief Construct an empty explicit cast. 1294 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1295 : CastExpr(SC, Shell) { } 1296 1297public: 1298 /// getTypeAsWritten - Returns the type that this expression is 1299 /// casting to, as written in the source code. 1300 QualType getTypeAsWritten() const { return TypeAsWritten; } 1301 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1302 1303 static bool classof(const Stmt *T) { 1304 StmtClass SC = T->getStmtClass(); 1305 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1306 return true; 1307 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1308 return true; 1309 1310 return false; 1311 } 1312 static bool classof(const ExplicitCastExpr *) { return true; } 1313}; 1314 1315/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1316/// cast in C++ (C++ [expr.cast]), which uses the syntax 1317/// (Type)expr. For example: @c (int)f. 1318class CStyleCastExpr : public ExplicitCastExpr { 1319 SourceLocation LPLoc; // the location of the left paren 1320 SourceLocation RPLoc; // the location of the right paren 1321public: 1322 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1323 SourceLocation l, SourceLocation r) : 1324 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1325 LPLoc(l), RPLoc(r) {} 1326 1327 /// \brief Construct an empty C-style explicit cast. 1328 explicit CStyleCastExpr(EmptyShell Shell) 1329 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1330 1331 SourceLocation getLParenLoc() const { return LPLoc; } 1332 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1333 1334 SourceLocation getRParenLoc() const { return RPLoc; } 1335 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1336 1337 virtual SourceRange getSourceRange() const { 1338 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1339 } 1340 static bool classof(const Stmt *T) { 1341 return T->getStmtClass() == CStyleCastExprClass; 1342 } 1343 static bool classof(const CStyleCastExpr *) { return true; } 1344 1345 virtual void EmitImpl(llvm::Serializer& S) const; 1346 static CStyleCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1347}; 1348 1349/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1350/// 1351/// This expression node kind describes a builtin binary operation, 1352/// such as "x + y" for integer values "x" and "y". The operands will 1353/// already have been converted to appropriate types (e.g., by 1354/// performing promotions or conversions). 1355/// 1356/// In C++, where operators may be overloaded, a different kind of 1357/// expression node (CXXOperatorCallExpr) is used to express the 1358/// invocation of an overloaded operator with operator syntax. Within 1359/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1360/// used to store an expression "x + y" depends on the subexpressions 1361/// for x and y. If neither x or y is type-dependent, and the "+" 1362/// operator resolves to a built-in operation, BinaryOperator will be 1363/// used to express the computation (x and y may still be 1364/// value-dependent). If either x or y is type-dependent, or if the 1365/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1366/// be used to express the computation. 1367class BinaryOperator : public Expr { 1368public: 1369 enum Opcode { 1370 // Operators listed in order of precedence. 1371 // Note that additions to this should also update the StmtVisitor class. 1372 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1373 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1374 Add, Sub, // [C99 6.5.6] Additive operators. 1375 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1376 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1377 EQ, NE, // [C99 6.5.9] Equality operators. 1378 And, // [C99 6.5.10] Bitwise AND operator. 1379 Xor, // [C99 6.5.11] Bitwise XOR operator. 1380 Or, // [C99 6.5.12] Bitwise OR operator. 1381 LAnd, // [C99 6.5.13] Logical AND operator. 1382 LOr, // [C99 6.5.14] Logical OR operator. 1383 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1384 DivAssign, RemAssign, 1385 AddAssign, SubAssign, 1386 ShlAssign, ShrAssign, 1387 AndAssign, XorAssign, 1388 OrAssign, 1389 Comma // [C99 6.5.17] Comma operator. 1390 }; 1391private: 1392 enum { LHS, RHS, END_EXPR }; 1393 Stmt* SubExprs[END_EXPR]; 1394 Opcode Opc; 1395 SourceLocation OpLoc; 1396public: 1397 1398 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1399 SourceLocation opLoc) 1400 : Expr(BinaryOperatorClass, ResTy, 1401 lhs->isTypeDependent() || rhs->isTypeDependent(), 1402 lhs->isValueDependent() || rhs->isValueDependent()), 1403 Opc(opc), OpLoc(opLoc) { 1404 SubExprs[LHS] = lhs; 1405 SubExprs[RHS] = rhs; 1406 assert(!isCompoundAssignmentOp() && 1407 "Use ArithAssignBinaryOperator for compound assignments"); 1408 } 1409 1410 /// \brief Construct an empty binary operator. 1411 explicit BinaryOperator(EmptyShell Empty) 1412 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1413 1414 SourceLocation getOperatorLoc() const { return OpLoc; } 1415 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1416 1417 Opcode getOpcode() const { return Opc; } 1418 void setOpcode(Opcode O) { Opc = O; } 1419 1420 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1421 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1422 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1423 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1424 1425 virtual SourceRange getSourceRange() const { 1426 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1427 } 1428 1429 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1430 /// corresponds to, e.g. "<<=". 1431 static const char *getOpcodeStr(Opcode Op); 1432 1433 /// \brief Retrieve the binary opcode that corresponds to the given 1434 /// overloaded operator. 1435 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1436 1437 /// \brief Retrieve the overloaded operator kind that corresponds to 1438 /// the given binary opcode. 1439 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1440 1441 /// predicates to categorize the respective opcodes. 1442 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1443 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1444 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1445 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1446 1447 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1448 bool isRelationalOp() const { return isRelationalOp(Opc); } 1449 1450 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1451 bool isEqualityOp() const { return isEqualityOp(Opc); } 1452 1453 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1454 bool isLogicalOp() const { return isLogicalOp(Opc); } 1455 1456 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1457 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1458 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1459 1460 static bool classof(const Stmt *S) { 1461 return S->getStmtClass() == BinaryOperatorClass || 1462 S->getStmtClass() == CompoundAssignOperatorClass; 1463 } 1464 static bool classof(const BinaryOperator *) { return true; } 1465 1466 // Iterators 1467 virtual child_iterator child_begin(); 1468 virtual child_iterator child_end(); 1469 1470 virtual void EmitImpl(llvm::Serializer& S) const; 1471 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1472 1473protected: 1474 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1475 SourceLocation oploc, bool dead) 1476 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1477 SubExprs[LHS] = lhs; 1478 SubExprs[RHS] = rhs; 1479 } 1480 1481 BinaryOperator(StmtClass SC, EmptyShell Empty) 1482 : Expr(SC, Empty), Opc(MulAssign) { } 1483}; 1484 1485/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1486/// track of the type the operation is performed in. Due to the semantics of 1487/// these operators, the operands are promoted, the aritmetic performed, an 1488/// implicit conversion back to the result type done, then the assignment takes 1489/// place. This captures the intermediate type which the computation is done 1490/// in. 1491class CompoundAssignOperator : public BinaryOperator { 1492 QualType ComputationLHSType; 1493 QualType ComputationResultType; 1494public: 1495 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1496 QualType ResType, QualType CompLHSType, 1497 QualType CompResultType, 1498 SourceLocation OpLoc) 1499 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1500 ComputationLHSType(CompLHSType), 1501 ComputationResultType(CompResultType) { 1502 assert(isCompoundAssignmentOp() && 1503 "Only should be used for compound assignments"); 1504 } 1505 1506 /// \brief Build an empty compound assignment operator expression. 1507 explicit CompoundAssignOperator(EmptyShell Empty) 1508 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 1509 1510 // The two computation types are the type the LHS is converted 1511 // to for the computation and the type of the result; the two are 1512 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1513 QualType getComputationLHSType() const { return ComputationLHSType; } 1514 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 1515 1516 QualType getComputationResultType() const { return ComputationResultType; } 1517 void setComputationResultType(QualType T) { ComputationResultType = T; } 1518 1519 static bool classof(const CompoundAssignOperator *) { return true; } 1520 static bool classof(const Stmt *S) { 1521 return S->getStmtClass() == CompoundAssignOperatorClass; 1522 } 1523 1524 virtual void EmitImpl(llvm::Serializer& S) const; 1525 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1526 ASTContext& C); 1527}; 1528 1529/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1530/// GNU "missing LHS" extension is in use. 1531/// 1532class ConditionalOperator : public Expr { 1533 enum { COND, LHS, RHS, END_EXPR }; 1534 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1535public: 1536 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1537 : Expr(ConditionalOperatorClass, t, 1538 // FIXME: the type of the conditional operator doesn't 1539 // depend on the type of the conditional, but the standard 1540 // seems to imply that it could. File a bug! 1541 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1542 (cond->isValueDependent() || 1543 (lhs && lhs->isValueDependent()) || 1544 (rhs && rhs->isValueDependent()))) { 1545 SubExprs[COND] = cond; 1546 SubExprs[LHS] = lhs; 1547 SubExprs[RHS] = rhs; 1548 } 1549 1550 /// \brief Build an empty conditional operator. 1551 explicit ConditionalOperator(EmptyShell Empty) 1552 : Expr(ConditionalOperatorClass, Empty) { } 1553 1554 // getCond - Return the expression representing the condition for 1555 // the ?: operator. 1556 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1557 void setCond(Expr *E) { SubExprs[COND] = E; } 1558 1559 // getTrueExpr - Return the subexpression representing the value of the ?: 1560 // expression if the condition evaluates to true. In most cases this value 1561 // will be the same as getLHS() except a GCC extension allows the left 1562 // subexpression to be omitted, and instead of the condition be returned. 1563 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1564 // is only evaluated once. 1565 Expr *getTrueExpr() const { 1566 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1567 } 1568 1569 // getTrueExpr - Return the subexpression representing the value of the ?: 1570 // expression if the condition evaluates to false. This is the same as getRHS. 1571 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1572 1573 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1574 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1575 1576 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1577 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1578 1579 virtual SourceRange getSourceRange() const { 1580 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1581 } 1582 static bool classof(const Stmt *T) { 1583 return T->getStmtClass() == ConditionalOperatorClass; 1584 } 1585 static bool classof(const ConditionalOperator *) { return true; } 1586 1587 // Iterators 1588 virtual child_iterator child_begin(); 1589 virtual child_iterator child_end(); 1590 1591 virtual void EmitImpl(llvm::Serializer& S) const; 1592 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1593}; 1594 1595/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1596class AddrLabelExpr : public Expr { 1597 SourceLocation AmpAmpLoc, LabelLoc; 1598 LabelStmt *Label; 1599public: 1600 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1601 QualType t) 1602 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1603 1604 virtual SourceRange getSourceRange() const { 1605 return SourceRange(AmpAmpLoc, LabelLoc); 1606 } 1607 1608 LabelStmt *getLabel() const { return Label; } 1609 1610 static bool classof(const Stmt *T) { 1611 return T->getStmtClass() == AddrLabelExprClass; 1612 } 1613 static bool classof(const AddrLabelExpr *) { return true; } 1614 1615 // Iterators 1616 virtual child_iterator child_begin(); 1617 virtual child_iterator child_end(); 1618 1619 virtual void EmitImpl(llvm::Serializer& S) const; 1620 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1621}; 1622 1623/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1624/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1625/// takes the value of the last subexpression. 1626class StmtExpr : public Expr { 1627 Stmt *SubStmt; 1628 SourceLocation LParenLoc, RParenLoc; 1629public: 1630 StmtExpr(CompoundStmt *substmt, QualType T, 1631 SourceLocation lp, SourceLocation rp) : 1632 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1633 1634 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1635 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1636 1637 virtual SourceRange getSourceRange() const { 1638 return SourceRange(LParenLoc, RParenLoc); 1639 } 1640 1641 SourceLocation getLParenLoc() const { return LParenLoc; } 1642 SourceLocation getRParenLoc() const { return RParenLoc; } 1643 1644 static bool classof(const Stmt *T) { 1645 return T->getStmtClass() == StmtExprClass; 1646 } 1647 static bool classof(const StmtExpr *) { return true; } 1648 1649 // Iterators 1650 virtual child_iterator child_begin(); 1651 virtual child_iterator child_end(); 1652 1653 virtual void EmitImpl(llvm::Serializer& S) const; 1654 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1655}; 1656 1657/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1658/// This AST node represents a function that returns 1 if two *types* (not 1659/// expressions) are compatible. The result of this built-in function can be 1660/// used in integer constant expressions. 1661class TypesCompatibleExpr : public Expr { 1662 QualType Type1; 1663 QualType Type2; 1664 SourceLocation BuiltinLoc, RParenLoc; 1665public: 1666 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1667 QualType t1, QualType t2, SourceLocation RP) : 1668 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1669 BuiltinLoc(BLoc), RParenLoc(RP) {} 1670 1671 /// \brief Build an empty __builtin_type_compatible_p expression. 1672 explicit TypesCompatibleExpr(EmptyShell Empty) 1673 : Expr(TypesCompatibleExprClass, Empty) { } 1674 1675 QualType getArgType1() const { return Type1; } 1676 void setArgType1(QualType T) { Type1 = T; } 1677 QualType getArgType2() const { return Type2; } 1678 void setArgType2(QualType T) { Type2 = T; } 1679 1680 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1681 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1682 1683 SourceLocation getRParenLoc() const { return RParenLoc; } 1684 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1685 1686 virtual SourceRange getSourceRange() const { 1687 return SourceRange(BuiltinLoc, RParenLoc); 1688 } 1689 static bool classof(const Stmt *T) { 1690 return T->getStmtClass() == TypesCompatibleExprClass; 1691 } 1692 static bool classof(const TypesCompatibleExpr *) { return true; } 1693 1694 // Iterators 1695 virtual child_iterator child_begin(); 1696 virtual child_iterator child_end(); 1697 1698 virtual void EmitImpl(llvm::Serializer& S) const; 1699 static TypesCompatibleExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1700}; 1701 1702/// ShuffleVectorExpr - clang-specific builtin-in function 1703/// __builtin_shufflevector. 1704/// This AST node represents a operator that does a constant 1705/// shuffle, similar to LLVM's shufflevector instruction. It takes 1706/// two vectors and a variable number of constant indices, 1707/// and returns the appropriately shuffled vector. 1708class ShuffleVectorExpr : public Expr { 1709 SourceLocation BuiltinLoc, RParenLoc; 1710 1711 // SubExprs - the list of values passed to the __builtin_shufflevector 1712 // function. The first two are vectors, and the rest are constant 1713 // indices. The number of values in this list is always 1714 // 2+the number of indices in the vector type. 1715 Stmt **SubExprs; 1716 unsigned NumExprs; 1717 1718public: 1719 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1720 QualType Type, SourceLocation BLoc, 1721 SourceLocation RP) : 1722 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1723 RParenLoc(RP), NumExprs(nexpr) { 1724 1725 SubExprs = new Stmt*[nexpr]; 1726 for (unsigned i = 0; i < nexpr; i++) 1727 SubExprs[i] = args[i]; 1728 } 1729 1730 /// \brief Build an empty vector-shuffle expression. 1731 explicit ShuffleVectorExpr(EmptyShell Empty) 1732 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 1733 1734 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1735 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1736 1737 SourceLocation getRParenLoc() const { return RParenLoc; } 1738 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1739 1740 virtual SourceRange getSourceRange() const { 1741 return SourceRange(BuiltinLoc, RParenLoc); 1742 } 1743 static bool classof(const Stmt *T) { 1744 return T->getStmtClass() == ShuffleVectorExprClass; 1745 } 1746 static bool classof(const ShuffleVectorExpr *) { return true; } 1747 1748 ~ShuffleVectorExpr() { 1749 delete [] SubExprs; 1750 } 1751 1752 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1753 /// constant expression, the actual arguments passed in, and the function 1754 /// pointers. 1755 unsigned getNumSubExprs() const { return NumExprs; } 1756 1757 /// getExpr - Return the Expr at the specified index. 1758 Expr *getExpr(unsigned Index) { 1759 assert((Index < NumExprs) && "Arg access out of range!"); 1760 return cast<Expr>(SubExprs[Index]); 1761 } 1762 const Expr *getExpr(unsigned Index) const { 1763 assert((Index < NumExprs) && "Arg access out of range!"); 1764 return cast<Expr>(SubExprs[Index]); 1765 } 1766 1767 void setExprs(Expr ** Exprs, unsigned NumExprs); 1768 1769 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1770 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1771 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1772 } 1773 1774 // Iterators 1775 virtual child_iterator child_begin(); 1776 virtual child_iterator child_end(); 1777 1778 virtual void EmitImpl(llvm::Serializer& S) const; 1779 static ShuffleVectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1780}; 1781 1782/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1783/// This AST node is similar to the conditional operator (?:) in C, with 1784/// the following exceptions: 1785/// - the test expression must be a integer constant expression. 1786/// - the expression returned acts like the chosen subexpression in every 1787/// visible way: the type is the same as that of the chosen subexpression, 1788/// and all predicates (whether it's an l-value, whether it's an integer 1789/// constant expression, etc.) return the same result as for the chosen 1790/// sub-expression. 1791class ChooseExpr : public Expr { 1792 enum { COND, LHS, RHS, END_EXPR }; 1793 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1794 SourceLocation BuiltinLoc, RParenLoc; 1795public: 1796 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1797 SourceLocation RP) 1798 : Expr(ChooseExprClass, t), 1799 BuiltinLoc(BLoc), RParenLoc(RP) { 1800 SubExprs[COND] = cond; 1801 SubExprs[LHS] = lhs; 1802 SubExprs[RHS] = rhs; 1803 } 1804 1805 /// \brief Build an empty __builtin_choose_expr. 1806 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 1807 1808 /// isConditionTrue - Return whether the condition is true (i.e. not 1809 /// equal to zero). 1810 bool isConditionTrue(ASTContext &C) const; 1811 1812 /// getChosenSubExpr - Return the subexpression chosen according to the 1813 /// condition. 1814 Expr *getChosenSubExpr(ASTContext &C) const { 1815 return isConditionTrue(C) ? getLHS() : getRHS(); 1816 } 1817 1818 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1819 void setCond(Expr *E) { SubExprs[COND] = E; } 1820 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1821 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1822 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1823 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1824 1825 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1826 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1827 1828 SourceLocation getRParenLoc() const { return RParenLoc; } 1829 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1830 1831 virtual SourceRange getSourceRange() const { 1832 return SourceRange(BuiltinLoc, RParenLoc); 1833 } 1834 static bool classof(const Stmt *T) { 1835 return T->getStmtClass() == ChooseExprClass; 1836 } 1837 static bool classof(const ChooseExpr *) { return true; } 1838 1839 // Iterators 1840 virtual child_iterator child_begin(); 1841 virtual child_iterator child_end(); 1842 1843 virtual void EmitImpl(llvm::Serializer& S) const; 1844 static ChooseExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1845}; 1846 1847/// GNUNullExpr - Implements the GNU __null extension, which is a name 1848/// for a null pointer constant that has integral type (e.g., int or 1849/// long) and is the same size and alignment as a pointer. The __null 1850/// extension is typically only used by system headers, which define 1851/// NULL as __null in C++ rather than using 0 (which is an integer 1852/// that may not match the size of a pointer). 1853class GNUNullExpr : public Expr { 1854 /// TokenLoc - The location of the __null keyword. 1855 SourceLocation TokenLoc; 1856 1857public: 1858 GNUNullExpr(QualType Ty, SourceLocation Loc) 1859 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1860 1861 /// \brief Build an empty GNU __null expression. 1862 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 1863 1864 /// getTokenLocation - The location of the __null token. 1865 SourceLocation getTokenLocation() const { return TokenLoc; } 1866 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 1867 1868 virtual SourceRange getSourceRange() const { 1869 return SourceRange(TokenLoc); 1870 } 1871 static bool classof(const Stmt *T) { 1872 return T->getStmtClass() == GNUNullExprClass; 1873 } 1874 static bool classof(const GNUNullExpr *) { return true; } 1875 1876 // Iterators 1877 virtual child_iterator child_begin(); 1878 virtual child_iterator child_end(); 1879 1880 virtual void EmitImpl(llvm::Serializer& S) const; 1881 static GNUNullExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1882}; 1883 1884/// VAArgExpr, used for the builtin function __builtin_va_start. 1885class VAArgExpr : public Expr { 1886 Stmt *Val; 1887 SourceLocation BuiltinLoc, RParenLoc; 1888public: 1889 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1890 : Expr(VAArgExprClass, t), 1891 Val(e), 1892 BuiltinLoc(BLoc), 1893 RParenLoc(RPLoc) { } 1894 1895 /// \brief Create an empty __builtin_va_start expression. 1896 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 1897 1898 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1899 Expr *getSubExpr() { return cast<Expr>(Val); } 1900 void setSubExpr(Expr *E) { Val = E; } 1901 1902 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1903 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1904 1905 SourceLocation getRParenLoc() const { return RParenLoc; } 1906 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1907 1908 virtual SourceRange getSourceRange() const { 1909 return SourceRange(BuiltinLoc, RParenLoc); 1910 } 1911 static bool classof(const Stmt *T) { 1912 return T->getStmtClass() == VAArgExprClass; 1913 } 1914 static bool classof(const VAArgExpr *) { return true; } 1915 1916 // Iterators 1917 virtual child_iterator child_begin(); 1918 virtual child_iterator child_end(); 1919 1920 virtual void EmitImpl(llvm::Serializer& S) const; 1921 static VAArgExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1922}; 1923 1924/// @brief Describes an C or C++ initializer list. 1925/// 1926/// InitListExpr describes an initializer list, which can be used to 1927/// initialize objects of different types, including 1928/// struct/class/union types, arrays, and vectors. For example: 1929/// 1930/// @code 1931/// struct foo x = { 1, { 2, 3 } }; 1932/// @endcode 1933/// 1934/// Prior to semantic analysis, an initializer list will represent the 1935/// initializer list as written by the user, but will have the 1936/// placeholder type "void". This initializer list is called the 1937/// syntactic form of the initializer, and may contain C99 designated 1938/// initializers (represented as DesignatedInitExprs), initializations 1939/// of subobject members without explicit braces, and so on. Clients 1940/// interested in the original syntax of the initializer list should 1941/// use the syntactic form of the initializer list. 1942/// 1943/// After semantic analysis, the initializer list will represent the 1944/// semantic form of the initializer, where the initializations of all 1945/// subobjects are made explicit with nested InitListExpr nodes and 1946/// C99 designators have been eliminated by placing the designated 1947/// initializations into the subobject they initialize. Additionally, 1948/// any "holes" in the initialization, where no initializer has been 1949/// specified for a particular subobject, will be replaced with 1950/// implicitly-generated ImplicitValueInitExpr expressions that 1951/// value-initialize the subobjects. Note, however, that the 1952/// initializer lists may still have fewer initializers than there are 1953/// elements to initialize within the object. 1954/// 1955/// Given the semantic form of the initializer list, one can retrieve 1956/// the original syntactic form of that initializer list (if it 1957/// exists) using getSyntacticForm(). Since many initializer lists 1958/// have the same syntactic and semantic forms, getSyntacticForm() may 1959/// return NULL, indicating that the current initializer list also 1960/// serves as its syntactic form. 1961class InitListExpr : public Expr { 1962 std::vector<Stmt *> InitExprs; 1963 SourceLocation LBraceLoc, RBraceLoc; 1964 1965 /// Contains the initializer list that describes the syntactic form 1966 /// written in the source code. 1967 InitListExpr *SyntacticForm; 1968 1969 /// If this initializer list initializes a union, specifies which 1970 /// field within the union will be initialized. 1971 FieldDecl *UnionFieldInit; 1972 1973 /// Whether this initializer list originally had a GNU array-range 1974 /// designator in it. This is a temporary marker used by CodeGen. 1975 bool HadArrayRangeDesignator; 1976 1977public: 1978 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1979 SourceLocation rbraceloc); 1980 1981 /// \brief Build an empty initializer list. 1982 explicit InitListExpr(EmptyShell Empty) : Expr(InitListExprClass, Empty) { } 1983 1984 unsigned getNumInits() const { return InitExprs.size(); } 1985 1986 const Expr* getInit(unsigned Init) const { 1987 assert(Init < getNumInits() && "Initializer access out of range!"); 1988 return cast_or_null<Expr>(InitExprs[Init]); 1989 } 1990 1991 Expr* getInit(unsigned Init) { 1992 assert(Init < getNumInits() && "Initializer access out of range!"); 1993 return cast_or_null<Expr>(InitExprs[Init]); 1994 } 1995 1996 void setInit(unsigned Init, Expr *expr) { 1997 assert(Init < getNumInits() && "Initializer access out of range!"); 1998 InitExprs[Init] = expr; 1999 } 2000 2001 /// \brief Reserve space for some number of initializers. 2002 void reserveInits(unsigned NumInits); 2003 2004 /// @brief Specify the number of initializers 2005 /// 2006 /// If there are more than @p NumInits initializers, the remaining 2007 /// initializers will be destroyed. If there are fewer than @p 2008 /// NumInits initializers, NULL expressions will be added for the 2009 /// unknown initializers. 2010 void resizeInits(ASTContext &Context, unsigned NumInits); 2011 2012 /// @brief Updates the initializer at index @p Init with the new 2013 /// expression @p expr, and returns the old expression at that 2014 /// location. 2015 /// 2016 /// When @p Init is out of range for this initializer list, the 2017 /// initializer list will be extended with NULL expressions to 2018 /// accomodate the new entry. 2019 Expr *updateInit(unsigned Init, Expr *expr); 2020 2021 /// \brief If this initializes a union, specifies which field in the 2022 /// union to initialize. 2023 /// 2024 /// Typically, this field is the first named field within the 2025 /// union. However, a designated initializer can specify the 2026 /// initialization of a different field within the union. 2027 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2028 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2029 2030 // Explicit InitListExpr's originate from source code (and have valid source 2031 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2032 bool isExplicit() { 2033 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2034 } 2035 2036 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2037 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2038 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2039 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2040 2041 /// @brief Retrieve the initializer list that describes the 2042 /// syntactic form of the initializer. 2043 /// 2044 /// 2045 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2046 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2047 2048 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2049 void sawArrayRangeDesignator(bool ARD = true) { 2050 HadArrayRangeDesignator = ARD; 2051 } 2052 2053 virtual SourceRange getSourceRange() const { 2054 return SourceRange(LBraceLoc, RBraceLoc); 2055 } 2056 static bool classof(const Stmt *T) { 2057 return T->getStmtClass() == InitListExprClass; 2058 } 2059 static bool classof(const InitListExpr *) { return true; } 2060 2061 // Iterators 2062 virtual child_iterator child_begin(); 2063 virtual child_iterator child_end(); 2064 2065 typedef std::vector<Stmt *>::iterator iterator; 2066 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 2067 2068 iterator begin() { return InitExprs.begin(); } 2069 iterator end() { return InitExprs.end(); } 2070 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2071 reverse_iterator rend() { return InitExprs.rend(); } 2072 2073 // Serailization. 2074 virtual void EmitImpl(llvm::Serializer& S) const; 2075 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2076 2077private: 2078 // Used by serializer. 2079 InitListExpr() : Expr(InitListExprClass, QualType()) {} 2080}; 2081 2082/// @brief Represents a C99 designated initializer expression. 2083/// 2084/// A designated initializer expression (C99 6.7.8) contains one or 2085/// more designators (which can be field designators, array 2086/// designators, or GNU array-range designators) followed by an 2087/// expression that initializes the field or element(s) that the 2088/// designators refer to. For example, given: 2089/// 2090/// @code 2091/// struct point { 2092/// double x; 2093/// double y; 2094/// }; 2095/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2096/// @endcode 2097/// 2098/// The InitListExpr contains three DesignatedInitExprs, the first of 2099/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2100/// designators, one array designator for @c [2] followed by one field 2101/// designator for @c .y. The initalization expression will be 1.0. 2102class DesignatedInitExpr : public Expr { 2103public: 2104 /// \brief Forward declaration of the Designator class. 2105 class Designator; 2106 2107private: 2108 /// The location of the '=' or ':' prior to the actual initializer 2109 /// expression. 2110 SourceLocation EqualOrColonLoc; 2111 2112 /// Whether this designated initializer used the GNU deprecated 2113 /// syntax rather than the C99 '=' syntax. 2114 bool GNUSyntax : 1; 2115 2116 /// The number of designators in this initializer expression. 2117 unsigned NumDesignators : 15; 2118 2119 /// \brief The designators in this designated initialization 2120 /// expression. 2121 Designator *Designators; 2122 2123 /// The number of subexpressions of this initializer expression, 2124 /// which contains both the initializer and any additional 2125 /// expressions used by array and array-range designators. 2126 unsigned NumSubExprs : 16; 2127 2128 2129 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2130 const Designator *Designators, 2131 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2132 unsigned NumSubExprs); 2133 2134 explicit DesignatedInitExpr(unsigned NumSubExprs) 2135 : Expr(DesignatedInitExprClass, EmptyShell()), 2136 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2137 2138public: 2139 /// A field designator, e.g., ".x". 2140 struct FieldDesignator { 2141 /// Refers to the field that is being initialized. The low bit 2142 /// of this field determines whether this is actually a pointer 2143 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2144 /// initially constructed, a field designator will store an 2145 /// IdentifierInfo*. After semantic analysis has resolved that 2146 /// name, the field designator will instead store a FieldDecl*. 2147 uintptr_t NameOrField; 2148 2149 /// The location of the '.' in the designated initializer. 2150 unsigned DotLoc; 2151 2152 /// The location of the field name in the designated initializer. 2153 unsigned FieldLoc; 2154 }; 2155 2156 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2157 struct ArrayOrRangeDesignator { 2158 /// Location of the first index expression within the designated 2159 /// initializer expression's list of subexpressions. 2160 unsigned Index; 2161 /// The location of the '[' starting the array range designator. 2162 unsigned LBracketLoc; 2163 /// The location of the ellipsis separating the start and end 2164 /// indices. Only valid for GNU array-range designators. 2165 unsigned EllipsisLoc; 2166 /// The location of the ']' terminating the array range designator. 2167 unsigned RBracketLoc; 2168 }; 2169 2170 /// @brief Represents a single C99 designator. 2171 /// 2172 /// @todo This class is infuriatingly similar to clang::Designator, 2173 /// but minor differences (storing indices vs. storing pointers) 2174 /// keep us from reusing it. Try harder, later, to rectify these 2175 /// differences. 2176 class Designator { 2177 /// @brief The kind of designator this describes. 2178 enum { 2179 FieldDesignator, 2180 ArrayDesignator, 2181 ArrayRangeDesignator 2182 } Kind; 2183 2184 union { 2185 /// A field designator, e.g., ".x". 2186 struct FieldDesignator Field; 2187 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2188 struct ArrayOrRangeDesignator ArrayOrRange; 2189 }; 2190 friend class DesignatedInitExpr; 2191 2192 public: 2193 Designator() {} 2194 2195 /// @brief Initializes a field designator. 2196 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2197 SourceLocation FieldLoc) 2198 : Kind(FieldDesignator) { 2199 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2200 Field.DotLoc = DotLoc.getRawEncoding(); 2201 Field.FieldLoc = FieldLoc.getRawEncoding(); 2202 } 2203 2204 /// @brief Initializes an array designator. 2205 Designator(unsigned Index, SourceLocation LBracketLoc, 2206 SourceLocation RBracketLoc) 2207 : Kind(ArrayDesignator) { 2208 ArrayOrRange.Index = Index; 2209 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2210 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2211 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2212 } 2213 2214 /// @brief Initializes a GNU array-range designator. 2215 Designator(unsigned Index, SourceLocation LBracketLoc, 2216 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2217 : Kind(ArrayRangeDesignator) { 2218 ArrayOrRange.Index = Index; 2219 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2220 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2221 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2222 } 2223 2224 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2225 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2226 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2227 2228 IdentifierInfo * getFieldName(); 2229 2230 FieldDecl *getField() { 2231 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2232 if (Field.NameOrField & 0x01) 2233 return 0; 2234 else 2235 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2236 } 2237 2238 void setField(FieldDecl *FD) { 2239 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2240 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2241 } 2242 2243 SourceLocation getDotLoc() const { 2244 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2245 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2246 } 2247 2248 SourceLocation getFieldLoc() const { 2249 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2250 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2251 } 2252 2253 SourceLocation getLBracketLoc() const { 2254 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2255 "Only valid on an array or array-range designator"); 2256 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2257 } 2258 2259 SourceLocation getRBracketLoc() const { 2260 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2261 "Only valid on an array or array-range designator"); 2262 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2263 } 2264 2265 SourceLocation getEllipsisLoc() const { 2266 assert(Kind == ArrayRangeDesignator && 2267 "Only valid on an array-range designator"); 2268 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2269 } 2270 2271 unsigned getFirstExprIndex() const { 2272 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2273 "Only valid on an array or array-range designator"); 2274 return ArrayOrRange.Index; 2275 } 2276 2277 SourceLocation getStartLocation() const { 2278 if (Kind == FieldDesignator) 2279 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2280 else 2281 return getLBracketLoc(); 2282 } 2283 }; 2284 2285 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2286 unsigned NumDesignators, 2287 Expr **IndexExprs, unsigned NumIndexExprs, 2288 SourceLocation EqualOrColonLoc, 2289 bool GNUSyntax, Expr *Init); 2290 2291 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2292 2293 /// @brief Returns the number of designators in this initializer. 2294 unsigned size() const { return NumDesignators; } 2295 2296 // Iterator access to the designators. 2297 typedef Designator* designators_iterator; 2298 designators_iterator designators_begin() { return Designators; } 2299 designators_iterator designators_end() { 2300 return Designators + NumDesignators; 2301 } 2302 2303 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2304 2305 void setDesignators(const Designator *Desigs, unsigned NumDesigs); 2306 2307 Expr *getArrayIndex(const Designator& D); 2308 Expr *getArrayRangeStart(const Designator& D); 2309 Expr *getArrayRangeEnd(const Designator& D); 2310 2311 /// @brief Retrieve the location of the '=' that precedes the 2312 /// initializer value itself, if present. 2313 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2314 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2315 2316 /// @brief Determines whether this designated initializer used the 2317 /// deprecated GNU syntax for designated initializers. 2318 bool usesGNUSyntax() const { return GNUSyntax; } 2319 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2320 2321 /// @brief Retrieve the initializer value. 2322 Expr *getInit() const { 2323 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2324 } 2325 2326 void setInit(Expr *init) { 2327 *child_begin() = init; 2328 } 2329 2330 /// \brief Retrieve the total number of subexpressions in this 2331 /// designated initializer expression, including the actual 2332 /// initialized value and any expressions that occur within array 2333 /// and array-range designators. 2334 unsigned getNumSubExprs() const { return NumSubExprs; } 2335 2336 Expr *getSubExpr(unsigned Idx) { 2337 assert(Idx < NumSubExprs && "Subscript out of range"); 2338 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2339 Ptr += sizeof(DesignatedInitExpr); 2340 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2341 } 2342 2343 void setSubExpr(unsigned Idx, Expr *E) { 2344 assert(Idx < NumSubExprs && "Subscript out of range"); 2345 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2346 Ptr += sizeof(DesignatedInitExpr); 2347 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2348 } 2349 2350 /// \brief Replaces the designator at index @p Idx with the series 2351 /// of designators in [First, Last). 2352 void ExpandDesignator(unsigned Idx, const Designator *First, 2353 const Designator *Last); 2354 2355 virtual SourceRange getSourceRange() const; 2356 2357 virtual void Destroy(ASTContext &C); 2358 2359 static bool classof(const Stmt *T) { 2360 return T->getStmtClass() == DesignatedInitExprClass; 2361 } 2362 static bool classof(const DesignatedInitExpr *) { return true; } 2363 2364 // Iterators 2365 virtual child_iterator child_begin(); 2366 virtual child_iterator child_end(); 2367}; 2368 2369/// \brief Represents an implicitly-generated value initialization of 2370/// an object of a given type. 2371/// 2372/// Implicit value initializations occur within semantic initializer 2373/// list expressions (InitListExpr) as placeholders for subobject 2374/// initializations not explicitly specified by the user. 2375/// 2376/// \see InitListExpr 2377class ImplicitValueInitExpr : public Expr { 2378public: 2379 explicit ImplicitValueInitExpr(QualType ty) 2380 : Expr(ImplicitValueInitExprClass, ty) { } 2381 2382 /// \brief Construct an empty implicit value initialization. 2383 explicit ImplicitValueInitExpr(EmptyShell Empty) 2384 : Expr(ImplicitValueInitExprClass, Empty) { } 2385 2386 static bool classof(const Stmt *T) { 2387 return T->getStmtClass() == ImplicitValueInitExprClass; 2388 } 2389 static bool classof(const ImplicitValueInitExpr *) { return true; } 2390 2391 virtual SourceRange getSourceRange() const { 2392 return SourceRange(); 2393 } 2394 2395 // Iterators 2396 virtual child_iterator child_begin(); 2397 virtual child_iterator child_end(); 2398}; 2399 2400//===----------------------------------------------------------------------===// 2401// Clang Extensions 2402//===----------------------------------------------------------------------===// 2403 2404 2405/// ExtVectorElementExpr - This represents access to specific elements of a 2406/// vector, and may occur on the left hand side or right hand side. For example 2407/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2408/// 2409/// Note that the base may have either vector or pointer to vector type, just 2410/// like a struct field reference. 2411/// 2412class ExtVectorElementExpr : public Expr { 2413 Stmt *Base; 2414 IdentifierInfo *Accessor; 2415 SourceLocation AccessorLoc; 2416public: 2417 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2418 SourceLocation loc) 2419 : Expr(ExtVectorElementExprClass, ty), 2420 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 2421 2422 /// \brief Build an empty vector element expression. 2423 explicit ExtVectorElementExpr(EmptyShell Empty) 2424 : Expr(ExtVectorElementExprClass, Empty) { } 2425 2426 const Expr *getBase() const { return cast<Expr>(Base); } 2427 Expr *getBase() { return cast<Expr>(Base); } 2428 void setBase(Expr *E) { Base = E; } 2429 2430 IdentifierInfo &getAccessor() const { return *Accessor; } 2431 void setAccessor(IdentifierInfo *II) { Accessor = II; } 2432 2433 SourceLocation getAccessorLoc() const { return AccessorLoc; } 2434 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 2435 2436 /// getNumElements - Get the number of components being selected. 2437 unsigned getNumElements() const; 2438 2439 /// containsDuplicateElements - Return true if any element access is 2440 /// repeated. 2441 bool containsDuplicateElements() const; 2442 2443 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2444 /// aggregate Constant of ConstantInt(s). 2445 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2446 2447 virtual SourceRange getSourceRange() const { 2448 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2449 } 2450 2451 /// isArrow - Return true if the base expression is a pointer to vector, 2452 /// return false if the base expression is a vector. 2453 bool isArrow() const; 2454 2455 static bool classof(const Stmt *T) { 2456 return T->getStmtClass() == ExtVectorElementExprClass; 2457 } 2458 static bool classof(const ExtVectorElementExpr *) { return true; } 2459 2460 // Iterators 2461 virtual child_iterator child_begin(); 2462 virtual child_iterator child_end(); 2463 2464 virtual void EmitImpl(llvm::Serializer& S) const; 2465 static ExtVectorElementExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2466}; 2467 2468 2469/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2470/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2471class BlockExpr : public Expr { 2472protected: 2473 BlockDecl *TheBlock; 2474 bool HasBlockDeclRefExprs; 2475public: 2476 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2477 : Expr(BlockExprClass, ty), 2478 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2479 2480 const BlockDecl *getBlockDecl() const { return TheBlock; } 2481 BlockDecl *getBlockDecl() { return TheBlock; } 2482 2483 // Convenience functions for probing the underlying BlockDecl. 2484 SourceLocation getCaretLocation() const; 2485 const Stmt *getBody() const; 2486 Stmt *getBody(); 2487 2488 virtual SourceRange getSourceRange() const { 2489 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2490 } 2491 2492 /// getFunctionType - Return the underlying function type for this block. 2493 const FunctionType *getFunctionType() const; 2494 2495 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2496 /// contained inside. 2497 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2498 2499 static bool classof(const Stmt *T) { 2500 return T->getStmtClass() == BlockExprClass; 2501 } 2502 static bool classof(const BlockExpr *) { return true; } 2503 2504 // Iterators 2505 virtual child_iterator child_begin(); 2506 virtual child_iterator child_end(); 2507 2508 virtual void EmitImpl(llvm::Serializer& S) const; 2509 static BlockExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2510}; 2511 2512/// BlockDeclRefExpr - A reference to a declared variable, function, 2513/// enum, etc. 2514class BlockDeclRefExpr : public Expr { 2515 ValueDecl *D; 2516 SourceLocation Loc; 2517 bool IsByRef; 2518public: 2519 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2520 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2521 2522 // \brief Build an empty reference to a declared variable in a 2523 // block. 2524 explicit BlockDeclRefExpr(EmptyShell Empty) 2525 : Expr(BlockDeclRefExprClass, Empty) { } 2526 2527 ValueDecl *getDecl() { return D; } 2528 const ValueDecl *getDecl() const { return D; } 2529 void setDecl(ValueDecl *VD) { D = VD; } 2530 2531 SourceLocation getLocation() const { return Loc; } 2532 void setLocation(SourceLocation L) { Loc = L; } 2533 2534 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2535 2536 bool isByRef() const { return IsByRef; } 2537 void setByRef(bool BR) { IsByRef = BR; } 2538 2539 static bool classof(const Stmt *T) { 2540 return T->getStmtClass() == BlockDeclRefExprClass; 2541 } 2542 static bool classof(const BlockDeclRefExpr *) { return true; } 2543 2544 // Iterators 2545 virtual child_iterator child_begin(); 2546 virtual child_iterator child_end(); 2547 2548 virtual void EmitImpl(llvm::Serializer& S) const; 2549 static BlockDeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2550}; 2551 2552} // end namespace clang 2553 2554#endif 2555