Expr.h revision 7d5c2f241c74e5f8d9ec492e8f9f268e5e9ae41f
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 /// \brief Build an empty address of a label expression. 1605 explicit AddrLabelExpr(EmptyShell Empty) 1606 : Expr(AddrLabelExprClass, Empty) { } 1607 1608 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 1609 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 1610 SourceLocation getLabelLoc() const { return LabelLoc; } 1611 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 1612 1613 virtual SourceRange getSourceRange() const { 1614 return SourceRange(AmpAmpLoc, LabelLoc); 1615 } 1616 1617 LabelStmt *getLabel() const { return Label; } 1618 void setLabel(LabelStmt *S) { Label = S; } 1619 1620 static bool classof(const Stmt *T) { 1621 return T->getStmtClass() == AddrLabelExprClass; 1622 } 1623 static bool classof(const AddrLabelExpr *) { return true; } 1624 1625 // Iterators 1626 virtual child_iterator child_begin(); 1627 virtual child_iterator child_end(); 1628 1629 virtual void EmitImpl(llvm::Serializer& S) const; 1630 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1631}; 1632 1633/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1634/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1635/// takes the value of the last subexpression. 1636class StmtExpr : public Expr { 1637 Stmt *SubStmt; 1638 SourceLocation LParenLoc, RParenLoc; 1639public: 1640 StmtExpr(CompoundStmt *substmt, QualType T, 1641 SourceLocation lp, SourceLocation rp) : 1642 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1643 1644 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1645 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1646 1647 virtual SourceRange getSourceRange() const { 1648 return SourceRange(LParenLoc, RParenLoc); 1649 } 1650 1651 SourceLocation getLParenLoc() const { return LParenLoc; } 1652 SourceLocation getRParenLoc() const { return RParenLoc; } 1653 1654 static bool classof(const Stmt *T) { 1655 return T->getStmtClass() == StmtExprClass; 1656 } 1657 static bool classof(const StmtExpr *) { return true; } 1658 1659 // Iterators 1660 virtual child_iterator child_begin(); 1661 virtual child_iterator child_end(); 1662 1663 virtual void EmitImpl(llvm::Serializer& S) const; 1664 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1665}; 1666 1667/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1668/// This AST node represents a function that returns 1 if two *types* (not 1669/// expressions) are compatible. The result of this built-in function can be 1670/// used in integer constant expressions. 1671class TypesCompatibleExpr : public Expr { 1672 QualType Type1; 1673 QualType Type2; 1674 SourceLocation BuiltinLoc, RParenLoc; 1675public: 1676 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1677 QualType t1, QualType t2, SourceLocation RP) : 1678 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1679 BuiltinLoc(BLoc), RParenLoc(RP) {} 1680 1681 /// \brief Build an empty __builtin_type_compatible_p expression. 1682 explicit TypesCompatibleExpr(EmptyShell Empty) 1683 : Expr(TypesCompatibleExprClass, Empty) { } 1684 1685 QualType getArgType1() const { return Type1; } 1686 void setArgType1(QualType T) { Type1 = T; } 1687 QualType getArgType2() const { return Type2; } 1688 void setArgType2(QualType T) { Type2 = T; } 1689 1690 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1691 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1692 1693 SourceLocation getRParenLoc() const { return RParenLoc; } 1694 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1695 1696 virtual SourceRange getSourceRange() const { 1697 return SourceRange(BuiltinLoc, RParenLoc); 1698 } 1699 static bool classof(const Stmt *T) { 1700 return T->getStmtClass() == TypesCompatibleExprClass; 1701 } 1702 static bool classof(const TypesCompatibleExpr *) { return true; } 1703 1704 // Iterators 1705 virtual child_iterator child_begin(); 1706 virtual child_iterator child_end(); 1707 1708 virtual void EmitImpl(llvm::Serializer& S) const; 1709 static TypesCompatibleExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1710}; 1711 1712/// ShuffleVectorExpr - clang-specific builtin-in function 1713/// __builtin_shufflevector. 1714/// This AST node represents a operator that does a constant 1715/// shuffle, similar to LLVM's shufflevector instruction. It takes 1716/// two vectors and a variable number of constant indices, 1717/// and returns the appropriately shuffled vector. 1718class ShuffleVectorExpr : public Expr { 1719 SourceLocation BuiltinLoc, RParenLoc; 1720 1721 // SubExprs - the list of values passed to the __builtin_shufflevector 1722 // function. The first two are vectors, and the rest are constant 1723 // indices. The number of values in this list is always 1724 // 2+the number of indices in the vector type. 1725 Stmt **SubExprs; 1726 unsigned NumExprs; 1727 1728public: 1729 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1730 QualType Type, SourceLocation BLoc, 1731 SourceLocation RP) : 1732 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1733 RParenLoc(RP), NumExprs(nexpr) { 1734 1735 SubExprs = new Stmt*[nexpr]; 1736 for (unsigned i = 0; i < nexpr; i++) 1737 SubExprs[i] = args[i]; 1738 } 1739 1740 /// \brief Build an empty vector-shuffle expression. 1741 explicit ShuffleVectorExpr(EmptyShell Empty) 1742 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 1743 1744 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1745 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1746 1747 SourceLocation getRParenLoc() const { return RParenLoc; } 1748 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1749 1750 virtual SourceRange getSourceRange() const { 1751 return SourceRange(BuiltinLoc, RParenLoc); 1752 } 1753 static bool classof(const Stmt *T) { 1754 return T->getStmtClass() == ShuffleVectorExprClass; 1755 } 1756 static bool classof(const ShuffleVectorExpr *) { return true; } 1757 1758 ~ShuffleVectorExpr() { 1759 delete [] SubExprs; 1760 } 1761 1762 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1763 /// constant expression, the actual arguments passed in, and the function 1764 /// pointers. 1765 unsigned getNumSubExprs() const { return NumExprs; } 1766 1767 /// getExpr - Return the Expr at the specified index. 1768 Expr *getExpr(unsigned Index) { 1769 assert((Index < NumExprs) && "Arg access out of range!"); 1770 return cast<Expr>(SubExprs[Index]); 1771 } 1772 const Expr *getExpr(unsigned Index) const { 1773 assert((Index < NumExprs) && "Arg access out of range!"); 1774 return cast<Expr>(SubExprs[Index]); 1775 } 1776 1777 void setExprs(Expr ** Exprs, unsigned NumExprs); 1778 1779 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1780 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1781 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1782 } 1783 1784 // Iterators 1785 virtual child_iterator child_begin(); 1786 virtual child_iterator child_end(); 1787 1788 virtual void EmitImpl(llvm::Serializer& S) const; 1789 static ShuffleVectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1790}; 1791 1792/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1793/// This AST node is similar to the conditional operator (?:) in C, with 1794/// the following exceptions: 1795/// - the test expression must be a integer constant expression. 1796/// - the expression returned acts like the chosen subexpression in every 1797/// visible way: the type is the same as that of the chosen subexpression, 1798/// and all predicates (whether it's an l-value, whether it's an integer 1799/// constant expression, etc.) return the same result as for the chosen 1800/// sub-expression. 1801class ChooseExpr : public Expr { 1802 enum { COND, LHS, RHS, END_EXPR }; 1803 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1804 SourceLocation BuiltinLoc, RParenLoc; 1805public: 1806 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1807 SourceLocation RP) 1808 : Expr(ChooseExprClass, t), 1809 BuiltinLoc(BLoc), RParenLoc(RP) { 1810 SubExprs[COND] = cond; 1811 SubExprs[LHS] = lhs; 1812 SubExprs[RHS] = rhs; 1813 } 1814 1815 /// \brief Build an empty __builtin_choose_expr. 1816 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 1817 1818 /// isConditionTrue - Return whether the condition is true (i.e. not 1819 /// equal to zero). 1820 bool isConditionTrue(ASTContext &C) const; 1821 1822 /// getChosenSubExpr - Return the subexpression chosen according to the 1823 /// condition. 1824 Expr *getChosenSubExpr(ASTContext &C) const { 1825 return isConditionTrue(C) ? getLHS() : getRHS(); 1826 } 1827 1828 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1829 void setCond(Expr *E) { SubExprs[COND] = E; } 1830 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1831 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1832 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1833 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1834 1835 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1836 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1837 1838 SourceLocation getRParenLoc() const { return RParenLoc; } 1839 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1840 1841 virtual SourceRange getSourceRange() const { 1842 return SourceRange(BuiltinLoc, RParenLoc); 1843 } 1844 static bool classof(const Stmt *T) { 1845 return T->getStmtClass() == ChooseExprClass; 1846 } 1847 static bool classof(const ChooseExpr *) { return true; } 1848 1849 // Iterators 1850 virtual child_iterator child_begin(); 1851 virtual child_iterator child_end(); 1852 1853 virtual void EmitImpl(llvm::Serializer& S) const; 1854 static ChooseExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1855}; 1856 1857/// GNUNullExpr - Implements the GNU __null extension, which is a name 1858/// for a null pointer constant that has integral type (e.g., int or 1859/// long) and is the same size and alignment as a pointer. The __null 1860/// extension is typically only used by system headers, which define 1861/// NULL as __null in C++ rather than using 0 (which is an integer 1862/// that may not match the size of a pointer). 1863class GNUNullExpr : public Expr { 1864 /// TokenLoc - The location of the __null keyword. 1865 SourceLocation TokenLoc; 1866 1867public: 1868 GNUNullExpr(QualType Ty, SourceLocation Loc) 1869 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1870 1871 /// \brief Build an empty GNU __null expression. 1872 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 1873 1874 /// getTokenLocation - The location of the __null token. 1875 SourceLocation getTokenLocation() const { return TokenLoc; } 1876 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 1877 1878 virtual SourceRange getSourceRange() const { 1879 return SourceRange(TokenLoc); 1880 } 1881 static bool classof(const Stmt *T) { 1882 return T->getStmtClass() == GNUNullExprClass; 1883 } 1884 static bool classof(const GNUNullExpr *) { return true; } 1885 1886 // Iterators 1887 virtual child_iterator child_begin(); 1888 virtual child_iterator child_end(); 1889 1890 virtual void EmitImpl(llvm::Serializer& S) const; 1891 static GNUNullExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1892}; 1893 1894/// VAArgExpr, used for the builtin function __builtin_va_start. 1895class VAArgExpr : public Expr { 1896 Stmt *Val; 1897 SourceLocation BuiltinLoc, RParenLoc; 1898public: 1899 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1900 : Expr(VAArgExprClass, t), 1901 Val(e), 1902 BuiltinLoc(BLoc), 1903 RParenLoc(RPLoc) { } 1904 1905 /// \brief Create an empty __builtin_va_start expression. 1906 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 1907 1908 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1909 Expr *getSubExpr() { return cast<Expr>(Val); } 1910 void setSubExpr(Expr *E) { Val = E; } 1911 1912 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1913 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1914 1915 SourceLocation getRParenLoc() const { return RParenLoc; } 1916 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1917 1918 virtual SourceRange getSourceRange() const { 1919 return SourceRange(BuiltinLoc, RParenLoc); 1920 } 1921 static bool classof(const Stmt *T) { 1922 return T->getStmtClass() == VAArgExprClass; 1923 } 1924 static bool classof(const VAArgExpr *) { return true; } 1925 1926 // Iterators 1927 virtual child_iterator child_begin(); 1928 virtual child_iterator child_end(); 1929 1930 virtual void EmitImpl(llvm::Serializer& S) const; 1931 static VAArgExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1932}; 1933 1934/// @brief Describes an C or C++ initializer list. 1935/// 1936/// InitListExpr describes an initializer list, which can be used to 1937/// initialize objects of different types, including 1938/// struct/class/union types, arrays, and vectors. For example: 1939/// 1940/// @code 1941/// struct foo x = { 1, { 2, 3 } }; 1942/// @endcode 1943/// 1944/// Prior to semantic analysis, an initializer list will represent the 1945/// initializer list as written by the user, but will have the 1946/// placeholder type "void". This initializer list is called the 1947/// syntactic form of the initializer, and may contain C99 designated 1948/// initializers (represented as DesignatedInitExprs), initializations 1949/// of subobject members without explicit braces, and so on. Clients 1950/// interested in the original syntax of the initializer list should 1951/// use the syntactic form of the initializer list. 1952/// 1953/// After semantic analysis, the initializer list will represent the 1954/// semantic form of the initializer, where the initializations of all 1955/// subobjects are made explicit with nested InitListExpr nodes and 1956/// C99 designators have been eliminated by placing the designated 1957/// initializations into the subobject they initialize. Additionally, 1958/// any "holes" in the initialization, where no initializer has been 1959/// specified for a particular subobject, will be replaced with 1960/// implicitly-generated ImplicitValueInitExpr expressions that 1961/// value-initialize the subobjects. Note, however, that the 1962/// initializer lists may still have fewer initializers than there are 1963/// elements to initialize within the object. 1964/// 1965/// Given the semantic form of the initializer list, one can retrieve 1966/// the original syntactic form of that initializer list (if it 1967/// exists) using getSyntacticForm(). Since many initializer lists 1968/// have the same syntactic and semantic forms, getSyntacticForm() may 1969/// return NULL, indicating that the current initializer list also 1970/// serves as its syntactic form. 1971class InitListExpr : public Expr { 1972 std::vector<Stmt *> InitExprs; 1973 SourceLocation LBraceLoc, RBraceLoc; 1974 1975 /// Contains the initializer list that describes the syntactic form 1976 /// written in the source code. 1977 InitListExpr *SyntacticForm; 1978 1979 /// If this initializer list initializes a union, specifies which 1980 /// field within the union will be initialized. 1981 FieldDecl *UnionFieldInit; 1982 1983 /// Whether this initializer list originally had a GNU array-range 1984 /// designator in it. This is a temporary marker used by CodeGen. 1985 bool HadArrayRangeDesignator; 1986 1987public: 1988 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1989 SourceLocation rbraceloc); 1990 1991 /// \brief Build an empty initializer list. 1992 explicit InitListExpr(EmptyShell Empty) : Expr(InitListExprClass, Empty) { } 1993 1994 unsigned getNumInits() const { return InitExprs.size(); } 1995 1996 const Expr* getInit(unsigned Init) const { 1997 assert(Init < getNumInits() && "Initializer access out of range!"); 1998 return cast_or_null<Expr>(InitExprs[Init]); 1999 } 2000 2001 Expr* getInit(unsigned Init) { 2002 assert(Init < getNumInits() && "Initializer access out of range!"); 2003 return cast_or_null<Expr>(InitExprs[Init]); 2004 } 2005 2006 void setInit(unsigned Init, Expr *expr) { 2007 assert(Init < getNumInits() && "Initializer access out of range!"); 2008 InitExprs[Init] = expr; 2009 } 2010 2011 /// \brief Reserve space for some number of initializers. 2012 void reserveInits(unsigned NumInits); 2013 2014 /// @brief Specify the number of initializers 2015 /// 2016 /// If there are more than @p NumInits initializers, the remaining 2017 /// initializers will be destroyed. If there are fewer than @p 2018 /// NumInits initializers, NULL expressions will be added for the 2019 /// unknown initializers. 2020 void resizeInits(ASTContext &Context, unsigned NumInits); 2021 2022 /// @brief Updates the initializer at index @p Init with the new 2023 /// expression @p expr, and returns the old expression at that 2024 /// location. 2025 /// 2026 /// When @p Init is out of range for this initializer list, the 2027 /// initializer list will be extended with NULL expressions to 2028 /// accomodate the new entry. 2029 Expr *updateInit(unsigned Init, Expr *expr); 2030 2031 /// \brief If this initializes a union, specifies which field in the 2032 /// union to initialize. 2033 /// 2034 /// Typically, this field is the first named field within the 2035 /// union. However, a designated initializer can specify the 2036 /// initialization of a different field within the union. 2037 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2038 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2039 2040 // Explicit InitListExpr's originate from source code (and have valid source 2041 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2042 bool isExplicit() { 2043 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2044 } 2045 2046 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2047 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2048 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2049 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2050 2051 /// @brief Retrieve the initializer list that describes the 2052 /// syntactic form of the initializer. 2053 /// 2054 /// 2055 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2056 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2057 2058 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2059 void sawArrayRangeDesignator(bool ARD = true) { 2060 HadArrayRangeDesignator = ARD; 2061 } 2062 2063 virtual SourceRange getSourceRange() const { 2064 return SourceRange(LBraceLoc, RBraceLoc); 2065 } 2066 static bool classof(const Stmt *T) { 2067 return T->getStmtClass() == InitListExprClass; 2068 } 2069 static bool classof(const InitListExpr *) { return true; } 2070 2071 // Iterators 2072 virtual child_iterator child_begin(); 2073 virtual child_iterator child_end(); 2074 2075 typedef std::vector<Stmt *>::iterator iterator; 2076 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 2077 2078 iterator begin() { return InitExprs.begin(); } 2079 iterator end() { return InitExprs.end(); } 2080 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2081 reverse_iterator rend() { return InitExprs.rend(); } 2082 2083 // Serailization. 2084 virtual void EmitImpl(llvm::Serializer& S) const; 2085 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2086 2087private: 2088 // Used by serializer. 2089 InitListExpr() : Expr(InitListExprClass, QualType()) {} 2090}; 2091 2092/// @brief Represents a C99 designated initializer expression. 2093/// 2094/// A designated initializer expression (C99 6.7.8) contains one or 2095/// more designators (which can be field designators, array 2096/// designators, or GNU array-range designators) followed by an 2097/// expression that initializes the field or element(s) that the 2098/// designators refer to. For example, given: 2099/// 2100/// @code 2101/// struct point { 2102/// double x; 2103/// double y; 2104/// }; 2105/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2106/// @endcode 2107/// 2108/// The InitListExpr contains three DesignatedInitExprs, the first of 2109/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2110/// designators, one array designator for @c [2] followed by one field 2111/// designator for @c .y. The initalization expression will be 1.0. 2112class DesignatedInitExpr : public Expr { 2113public: 2114 /// \brief Forward declaration of the Designator class. 2115 class Designator; 2116 2117private: 2118 /// The location of the '=' or ':' prior to the actual initializer 2119 /// expression. 2120 SourceLocation EqualOrColonLoc; 2121 2122 /// Whether this designated initializer used the GNU deprecated 2123 /// syntax rather than the C99 '=' syntax. 2124 bool GNUSyntax : 1; 2125 2126 /// The number of designators in this initializer expression. 2127 unsigned NumDesignators : 15; 2128 2129 /// \brief The designators in this designated initialization 2130 /// expression. 2131 Designator *Designators; 2132 2133 /// The number of subexpressions of this initializer expression, 2134 /// which contains both the initializer and any additional 2135 /// expressions used by array and array-range designators. 2136 unsigned NumSubExprs : 16; 2137 2138 2139 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2140 const Designator *Designators, 2141 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2142 unsigned NumSubExprs); 2143 2144 explicit DesignatedInitExpr(unsigned NumSubExprs) 2145 : Expr(DesignatedInitExprClass, EmptyShell()), 2146 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2147 2148public: 2149 /// A field designator, e.g., ".x". 2150 struct FieldDesignator { 2151 /// Refers to the field that is being initialized. The low bit 2152 /// of this field determines whether this is actually a pointer 2153 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2154 /// initially constructed, a field designator will store an 2155 /// IdentifierInfo*. After semantic analysis has resolved that 2156 /// name, the field designator will instead store a FieldDecl*. 2157 uintptr_t NameOrField; 2158 2159 /// The location of the '.' in the designated initializer. 2160 unsigned DotLoc; 2161 2162 /// The location of the field name in the designated initializer. 2163 unsigned FieldLoc; 2164 }; 2165 2166 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2167 struct ArrayOrRangeDesignator { 2168 /// Location of the first index expression within the designated 2169 /// initializer expression's list of subexpressions. 2170 unsigned Index; 2171 /// The location of the '[' starting the array range designator. 2172 unsigned LBracketLoc; 2173 /// The location of the ellipsis separating the start and end 2174 /// indices. Only valid for GNU array-range designators. 2175 unsigned EllipsisLoc; 2176 /// The location of the ']' terminating the array range designator. 2177 unsigned RBracketLoc; 2178 }; 2179 2180 /// @brief Represents a single C99 designator. 2181 /// 2182 /// @todo This class is infuriatingly similar to clang::Designator, 2183 /// but minor differences (storing indices vs. storing pointers) 2184 /// keep us from reusing it. Try harder, later, to rectify these 2185 /// differences. 2186 class Designator { 2187 /// @brief The kind of designator this describes. 2188 enum { 2189 FieldDesignator, 2190 ArrayDesignator, 2191 ArrayRangeDesignator 2192 } Kind; 2193 2194 union { 2195 /// A field designator, e.g., ".x". 2196 struct FieldDesignator Field; 2197 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2198 struct ArrayOrRangeDesignator ArrayOrRange; 2199 }; 2200 friend class DesignatedInitExpr; 2201 2202 public: 2203 Designator() {} 2204 2205 /// @brief Initializes a field designator. 2206 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2207 SourceLocation FieldLoc) 2208 : Kind(FieldDesignator) { 2209 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2210 Field.DotLoc = DotLoc.getRawEncoding(); 2211 Field.FieldLoc = FieldLoc.getRawEncoding(); 2212 } 2213 2214 /// @brief Initializes an array designator. 2215 Designator(unsigned Index, SourceLocation LBracketLoc, 2216 SourceLocation RBracketLoc) 2217 : Kind(ArrayDesignator) { 2218 ArrayOrRange.Index = Index; 2219 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2220 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2221 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2222 } 2223 2224 /// @brief Initializes a GNU array-range designator. 2225 Designator(unsigned Index, SourceLocation LBracketLoc, 2226 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2227 : Kind(ArrayRangeDesignator) { 2228 ArrayOrRange.Index = Index; 2229 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2230 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2231 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2232 } 2233 2234 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2235 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2236 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2237 2238 IdentifierInfo * getFieldName(); 2239 2240 FieldDecl *getField() { 2241 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2242 if (Field.NameOrField & 0x01) 2243 return 0; 2244 else 2245 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2246 } 2247 2248 void setField(FieldDecl *FD) { 2249 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2250 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2251 } 2252 2253 SourceLocation getDotLoc() const { 2254 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2255 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2256 } 2257 2258 SourceLocation getFieldLoc() const { 2259 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2260 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2261 } 2262 2263 SourceLocation getLBracketLoc() const { 2264 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2265 "Only valid on an array or array-range designator"); 2266 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2267 } 2268 2269 SourceLocation getRBracketLoc() const { 2270 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2271 "Only valid on an array or array-range designator"); 2272 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2273 } 2274 2275 SourceLocation getEllipsisLoc() const { 2276 assert(Kind == ArrayRangeDesignator && 2277 "Only valid on an array-range designator"); 2278 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2279 } 2280 2281 unsigned getFirstExprIndex() const { 2282 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2283 "Only valid on an array or array-range designator"); 2284 return ArrayOrRange.Index; 2285 } 2286 2287 SourceLocation getStartLocation() const { 2288 if (Kind == FieldDesignator) 2289 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2290 else 2291 return getLBracketLoc(); 2292 } 2293 }; 2294 2295 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2296 unsigned NumDesignators, 2297 Expr **IndexExprs, unsigned NumIndexExprs, 2298 SourceLocation EqualOrColonLoc, 2299 bool GNUSyntax, Expr *Init); 2300 2301 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2302 2303 /// @brief Returns the number of designators in this initializer. 2304 unsigned size() const { return NumDesignators; } 2305 2306 // Iterator access to the designators. 2307 typedef Designator* designators_iterator; 2308 designators_iterator designators_begin() { return Designators; } 2309 designators_iterator designators_end() { 2310 return Designators + NumDesignators; 2311 } 2312 2313 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2314 2315 void setDesignators(const Designator *Desigs, unsigned NumDesigs); 2316 2317 Expr *getArrayIndex(const Designator& D); 2318 Expr *getArrayRangeStart(const Designator& D); 2319 Expr *getArrayRangeEnd(const Designator& D); 2320 2321 /// @brief Retrieve the location of the '=' that precedes the 2322 /// initializer value itself, if present. 2323 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2324 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2325 2326 /// @brief Determines whether this designated initializer used the 2327 /// deprecated GNU syntax for designated initializers. 2328 bool usesGNUSyntax() const { return GNUSyntax; } 2329 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2330 2331 /// @brief Retrieve the initializer value. 2332 Expr *getInit() const { 2333 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2334 } 2335 2336 void setInit(Expr *init) { 2337 *child_begin() = init; 2338 } 2339 2340 /// \brief Retrieve the total number of subexpressions in this 2341 /// designated initializer expression, including the actual 2342 /// initialized value and any expressions that occur within array 2343 /// and array-range designators. 2344 unsigned getNumSubExprs() const { return NumSubExprs; } 2345 2346 Expr *getSubExpr(unsigned Idx) { 2347 assert(Idx < NumSubExprs && "Subscript out of range"); 2348 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2349 Ptr += sizeof(DesignatedInitExpr); 2350 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2351 } 2352 2353 void setSubExpr(unsigned Idx, Expr *E) { 2354 assert(Idx < NumSubExprs && "Subscript out of range"); 2355 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2356 Ptr += sizeof(DesignatedInitExpr); 2357 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2358 } 2359 2360 /// \brief Replaces the designator at index @p Idx with the series 2361 /// of designators in [First, Last). 2362 void ExpandDesignator(unsigned Idx, const Designator *First, 2363 const Designator *Last); 2364 2365 virtual SourceRange getSourceRange() const; 2366 2367 virtual void Destroy(ASTContext &C); 2368 2369 static bool classof(const Stmt *T) { 2370 return T->getStmtClass() == DesignatedInitExprClass; 2371 } 2372 static bool classof(const DesignatedInitExpr *) { return true; } 2373 2374 // Iterators 2375 virtual child_iterator child_begin(); 2376 virtual child_iterator child_end(); 2377}; 2378 2379/// \brief Represents an implicitly-generated value initialization of 2380/// an object of a given type. 2381/// 2382/// Implicit value initializations occur within semantic initializer 2383/// list expressions (InitListExpr) as placeholders for subobject 2384/// initializations not explicitly specified by the user. 2385/// 2386/// \see InitListExpr 2387class ImplicitValueInitExpr : public Expr { 2388public: 2389 explicit ImplicitValueInitExpr(QualType ty) 2390 : Expr(ImplicitValueInitExprClass, ty) { } 2391 2392 /// \brief Construct an empty implicit value initialization. 2393 explicit ImplicitValueInitExpr(EmptyShell Empty) 2394 : Expr(ImplicitValueInitExprClass, Empty) { } 2395 2396 static bool classof(const Stmt *T) { 2397 return T->getStmtClass() == ImplicitValueInitExprClass; 2398 } 2399 static bool classof(const ImplicitValueInitExpr *) { return true; } 2400 2401 virtual SourceRange getSourceRange() const { 2402 return SourceRange(); 2403 } 2404 2405 // Iterators 2406 virtual child_iterator child_begin(); 2407 virtual child_iterator child_end(); 2408}; 2409 2410//===----------------------------------------------------------------------===// 2411// Clang Extensions 2412//===----------------------------------------------------------------------===// 2413 2414 2415/// ExtVectorElementExpr - This represents access to specific elements of a 2416/// vector, and may occur on the left hand side or right hand side. For example 2417/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2418/// 2419/// Note that the base may have either vector or pointer to vector type, just 2420/// like a struct field reference. 2421/// 2422class ExtVectorElementExpr : public Expr { 2423 Stmt *Base; 2424 IdentifierInfo *Accessor; 2425 SourceLocation AccessorLoc; 2426public: 2427 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2428 SourceLocation loc) 2429 : Expr(ExtVectorElementExprClass, ty), 2430 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 2431 2432 /// \brief Build an empty vector element expression. 2433 explicit ExtVectorElementExpr(EmptyShell Empty) 2434 : Expr(ExtVectorElementExprClass, Empty) { } 2435 2436 const Expr *getBase() const { return cast<Expr>(Base); } 2437 Expr *getBase() { return cast<Expr>(Base); } 2438 void setBase(Expr *E) { Base = E; } 2439 2440 IdentifierInfo &getAccessor() const { return *Accessor; } 2441 void setAccessor(IdentifierInfo *II) { Accessor = II; } 2442 2443 SourceLocation getAccessorLoc() const { return AccessorLoc; } 2444 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 2445 2446 /// getNumElements - Get the number of components being selected. 2447 unsigned getNumElements() const; 2448 2449 /// containsDuplicateElements - Return true if any element access is 2450 /// repeated. 2451 bool containsDuplicateElements() const; 2452 2453 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2454 /// aggregate Constant of ConstantInt(s). 2455 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2456 2457 virtual SourceRange getSourceRange() const { 2458 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2459 } 2460 2461 /// isArrow - Return true if the base expression is a pointer to vector, 2462 /// return false if the base expression is a vector. 2463 bool isArrow() const; 2464 2465 static bool classof(const Stmt *T) { 2466 return T->getStmtClass() == ExtVectorElementExprClass; 2467 } 2468 static bool classof(const ExtVectorElementExpr *) { return true; } 2469 2470 // Iterators 2471 virtual child_iterator child_begin(); 2472 virtual child_iterator child_end(); 2473 2474 virtual void EmitImpl(llvm::Serializer& S) const; 2475 static ExtVectorElementExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2476}; 2477 2478 2479/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2480/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2481class BlockExpr : public Expr { 2482protected: 2483 BlockDecl *TheBlock; 2484 bool HasBlockDeclRefExprs; 2485public: 2486 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2487 : Expr(BlockExprClass, ty), 2488 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2489 2490 const BlockDecl *getBlockDecl() const { return TheBlock; } 2491 BlockDecl *getBlockDecl() { return TheBlock; } 2492 2493 // Convenience functions for probing the underlying BlockDecl. 2494 SourceLocation getCaretLocation() const; 2495 const Stmt *getBody() const; 2496 Stmt *getBody(); 2497 2498 virtual SourceRange getSourceRange() const { 2499 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2500 } 2501 2502 /// getFunctionType - Return the underlying function type for this block. 2503 const FunctionType *getFunctionType() const; 2504 2505 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2506 /// contained inside. 2507 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2508 2509 static bool classof(const Stmt *T) { 2510 return T->getStmtClass() == BlockExprClass; 2511 } 2512 static bool classof(const BlockExpr *) { return true; } 2513 2514 // Iterators 2515 virtual child_iterator child_begin(); 2516 virtual child_iterator child_end(); 2517 2518 virtual void EmitImpl(llvm::Serializer& S) const; 2519 static BlockExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2520}; 2521 2522/// BlockDeclRefExpr - A reference to a declared variable, function, 2523/// enum, etc. 2524class BlockDeclRefExpr : public Expr { 2525 ValueDecl *D; 2526 SourceLocation Loc; 2527 bool IsByRef; 2528public: 2529 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2530 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2531 2532 // \brief Build an empty reference to a declared variable in a 2533 // block. 2534 explicit BlockDeclRefExpr(EmptyShell Empty) 2535 : Expr(BlockDeclRefExprClass, Empty) { } 2536 2537 ValueDecl *getDecl() { return D; } 2538 const ValueDecl *getDecl() const { return D; } 2539 void setDecl(ValueDecl *VD) { D = VD; } 2540 2541 SourceLocation getLocation() const { return Loc; } 2542 void setLocation(SourceLocation L) { Loc = L; } 2543 2544 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2545 2546 bool isByRef() const { return IsByRef; } 2547 void setByRef(bool BR) { IsByRef = BR; } 2548 2549 static bool classof(const Stmt *T) { 2550 return T->getStmtClass() == BlockDeclRefExprClass; 2551 } 2552 static bool classof(const BlockDeclRefExpr *) { return true; } 2553 2554 // Iterators 2555 virtual child_iterator child_begin(); 2556 virtual child_iterator child_end(); 2557 2558 virtual void EmitImpl(llvm::Serializer& S) const; 2559 static BlockDeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2560}; 2561 2562} // end namespace clang 2563 2564#endif 2565