Expr.h revision 33bbbc5ec8269bc2cde5b84f970fa49319a30267
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 /// \brief If this expression refers to a bit-field, retrieve the 179 /// declaration of that bit-field. 180 FieldDecl *getBitField(); 181 182 /// isIntegerConstantExpr - Return true if this expression is a valid integer 183 /// constant expression, and, if so, return its value in Result. If not a 184 /// valid i-c-e, return false and fill in Loc (if specified) with the location 185 /// of the invalid expression. 186 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 187 SourceLocation *Loc = 0, 188 bool isEvaluated = true) const; 189 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 190 llvm::APSInt X; 191 return isIntegerConstantExpr(X, Ctx, Loc); 192 } 193 /// isConstantInitializer - Returns true if this expression is a constant 194 /// initializer, which can be emitted at compile-time. 195 bool isConstantInitializer(ASTContext &Ctx) const; 196 197 /// EvalResult is a struct with detailed info about an evaluated expression. 198 struct EvalResult { 199 /// Val - This is the value the expression can be folded to. 200 APValue Val; 201 202 /// HasSideEffects - Whether the evaluated expression has side effects. 203 /// For example, (f() && 0) can be folded, but it still has side effects. 204 bool HasSideEffects; 205 206 /// Diag - If the expression is unfoldable, then Diag contains a note 207 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 208 /// position for the error, and DiagExpr is the expression that caused 209 /// the error. 210 /// If the expression is foldable, but not an integer constant expression, 211 /// Diag contains a note diagnostic that describes why it isn't an integer 212 /// constant expression. If the expression *is* an integer constant 213 /// expression, then Diag will be zero. 214 unsigned Diag; 215 const Expr *DiagExpr; 216 SourceLocation DiagLoc; 217 218 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 219 }; 220 221 /// Evaluate - Return true if this is a constant which we can fold using 222 /// any crazy technique (that has nothing to do with language standards) that 223 /// we want to. If this function returns true, it returns the folded constant 224 /// in Result. 225 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 226 227 /// isEvaluatable - Call Evaluate to see if this expression can be constant 228 /// folded, but discard the result. 229 bool isEvaluatable(ASTContext &Ctx) const; 230 231 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 232 /// must be called on an expression that constant folds to an integer. 233 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 234 235 /// EvaluateAsLValue - Evaluate an expression to see if it's a valid LValue. 236 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 237 238 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 239 /// integer constant expression with the value zero, or if this is one that is 240 /// cast to void*. 241 bool isNullPointerConstant(ASTContext &Ctx) const; 242 243 /// hasGlobalStorage - Return true if this expression has static storage 244 /// duration. This means that the address of this expression is a link-time 245 /// constant. 246 bool hasGlobalStorage() const; 247 248 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 249 /// write barrier. 250 bool isOBJCGCCandidate() const; 251 252 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 253 /// its subexpression. If that subexpression is also a ParenExpr, 254 /// then this method recursively returns its subexpression, and so forth. 255 /// Otherwise, the method returns the current Expr. 256 Expr* IgnoreParens(); 257 258 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 259 /// or CastExprs, returning their operand. 260 Expr *IgnoreParenCasts(); 261 262 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 263 /// value (including ptr->int casts of the same size). Strip off any 264 /// ParenExpr or CastExprs, returning their operand. 265 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 266 267 const Expr* IgnoreParens() const { 268 return const_cast<Expr*>(this)->IgnoreParens(); 269 } 270 const Expr *IgnoreParenCasts() const { 271 return const_cast<Expr*>(this)->IgnoreParenCasts(); 272 } 273 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 274 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 275 } 276 277 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 278 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 279 280 static bool classof(const Stmt *T) { 281 return T->getStmtClass() >= firstExprConstant && 282 T->getStmtClass() <= lastExprConstant; 283 } 284 static bool classof(const Expr *) { return true; } 285}; 286 287 288//===----------------------------------------------------------------------===// 289// Primary Expressions. 290//===----------------------------------------------------------------------===// 291 292/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 293/// enum, etc. 294class DeclRefExpr : public Expr { 295 NamedDecl *D; 296 SourceLocation Loc; 297 298protected: 299 // FIXME: Eventually, this constructor will go away and all subclasses 300 // will have to provide the type- and value-dependent flags. 301 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 302 Expr(SC, t), D(d), Loc(l) {} 303 304 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 305 bool VD) : 306 Expr(SC, t, TD, VD), D(d), Loc(l) {} 307 308public: 309 // FIXME: Eventually, this constructor will go away and all clients 310 // will have to provide the type- and value-dependent flags. 311 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 312 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 313 314 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 315 Expr(DeclRefExprClass, t, TD, VD), D(d), Loc(l) {} 316 317 /// \brief Construct an empty declaration reference expression. 318 explicit DeclRefExpr(EmptyShell Empty) 319 : Expr(DeclRefExprClass, Empty) { } 320 321 NamedDecl *getDecl() { return D; } 322 const NamedDecl *getDecl() const { return D; } 323 void setDecl(NamedDecl *NewD) { D = NewD; } 324 325 SourceLocation getLocation() const { return Loc; } 326 void setLocation(SourceLocation L) { Loc = L; } 327 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 328 329 static bool classof(const Stmt *T) { 330 return T->getStmtClass() == DeclRefExprClass || 331 T->getStmtClass() == CXXConditionDeclExprClass || 332 T->getStmtClass() == QualifiedDeclRefExprClass; 333 } 334 static bool classof(const DeclRefExpr *) { return true; } 335 336 // Iterators 337 virtual child_iterator child_begin(); 338 virtual child_iterator child_end(); 339}; 340 341/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 342class PredefinedExpr : public Expr { 343public: 344 enum IdentType { 345 Func, 346 Function, 347 PrettyFunction 348 }; 349 350private: 351 SourceLocation Loc; 352 IdentType Type; 353public: 354 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 355 : Expr(PredefinedExprClass, type), Loc(l), Type(IT) {} 356 357 /// \brief Construct an empty predefined expression. 358 explicit PredefinedExpr(EmptyShell Empty) 359 : Expr(PredefinedExprClass, Empty) { } 360 361 IdentType getIdentType() const { return Type; } 362 void setIdentType(IdentType IT) { Type = IT; } 363 364 SourceLocation getLocation() const { return Loc; } 365 void setLocation(SourceLocation L) { Loc = L; } 366 367 // FIXME: The logic for computing the value of a predefined expr should go 368 // into a method here that takes the inner-most code decl (a block, function 369 // or objc method) that the expr lives in. This would allow sema and codegen 370 // to be consistent for things like sizeof(__func__) etc. 371 372 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 373 374 static bool classof(const Stmt *T) { 375 return T->getStmtClass() == PredefinedExprClass; 376 } 377 static bool classof(const PredefinedExpr *) { return true; } 378 379 // Iterators 380 virtual child_iterator child_begin(); 381 virtual child_iterator child_end(); 382}; 383 384class IntegerLiteral : public Expr { 385 llvm::APInt Value; 386 SourceLocation Loc; 387public: 388 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 389 // or UnsignedLongLongTy 390 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 391 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 392 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 393 } 394 395 /// \brief Construct an empty integer literal. 396 explicit IntegerLiteral(EmptyShell Empty) 397 : Expr(IntegerLiteralClass, Empty) { } 398 399 IntegerLiteral* Clone(ASTContext &C) const; 400 401 const llvm::APInt &getValue() const { return Value; } 402 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 403 404 /// \brief Retrieve the location of the literal. 405 SourceLocation getLocation() const { return Loc; } 406 407 void setValue(const llvm::APInt &Val) { Value = Val; } 408 void setLocation(SourceLocation Location) { Loc = Location; } 409 410 static bool classof(const Stmt *T) { 411 return T->getStmtClass() == IntegerLiteralClass; 412 } 413 static bool classof(const IntegerLiteral *) { return true; } 414 415 // Iterators 416 virtual child_iterator child_begin(); 417 virtual child_iterator child_end(); 418}; 419 420class CharacterLiteral : public Expr { 421 unsigned Value; 422 SourceLocation Loc; 423 bool IsWide; 424public: 425 // type should be IntTy 426 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 427 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 428 } 429 430 /// \brief Construct an empty character literal. 431 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 432 433 SourceLocation getLoc() const { return Loc; } 434 bool isWide() const { return IsWide; } 435 436 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 437 438 unsigned getValue() const { return Value; } 439 440 void setLocation(SourceLocation Location) { Loc = Location; } 441 void setWide(bool W) { IsWide = W; } 442 void setValue(unsigned Val) { Value = Val; } 443 444 static bool classof(const Stmt *T) { 445 return T->getStmtClass() == CharacterLiteralClass; 446 } 447 static bool classof(const CharacterLiteral *) { return true; } 448 449 // Iterators 450 virtual child_iterator child_begin(); 451 virtual child_iterator child_end(); 452}; 453 454class FloatingLiteral : public Expr { 455 llvm::APFloat Value; 456 bool IsExact : 1; 457 SourceLocation Loc; 458public: 459 FloatingLiteral(const llvm::APFloat &V, bool* isexact, 460 QualType Type, SourceLocation L) 461 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(*isexact), Loc(L) {} 462 463 /// \brief Construct an empty floating-point literal. 464 FloatingLiteral(EmptyShell Empty) 465 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 466 467 const llvm::APFloat &getValue() const { return Value; } 468 void setValue(const llvm::APFloat &Val) { Value = Val; } 469 470 bool isExact() const { return IsExact; } 471 void setExact(bool E) { IsExact = E; } 472 473 /// getValueAsApproximateDouble - This returns the value as an inaccurate 474 /// double. Note that this may cause loss of precision, but is useful for 475 /// debugging dumps, etc. 476 double getValueAsApproximateDouble() const; 477 478 SourceLocation getLocation() const { return Loc; } 479 void setLocation(SourceLocation L) { Loc = L; } 480 481 // FIXME: The logic for computing the value of a predefined expr should go 482 // into a method here that takes the inner-most code decl (a block, function 483 // or objc method) that the expr lives in. This would allow sema and codegen 484 // to be consistent for things like sizeof(__func__) etc. 485 486 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 487 488 static bool classof(const Stmt *T) { 489 return T->getStmtClass() == FloatingLiteralClass; 490 } 491 static bool classof(const FloatingLiteral *) { return true; } 492 493 // Iterators 494 virtual child_iterator child_begin(); 495 virtual child_iterator child_end(); 496}; 497 498/// ImaginaryLiteral - We support imaginary integer and floating point literals, 499/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 500/// IntegerLiteral classes. Instances of this class always have a Complex type 501/// whose element type matches the subexpression. 502/// 503class ImaginaryLiteral : public Expr { 504 Stmt *Val; 505public: 506 ImaginaryLiteral(Expr *val, QualType Ty) 507 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 508 509 /// \brief Build an empty imaginary literal. 510 explicit ImaginaryLiteral(EmptyShell Empty) 511 : Expr(ImaginaryLiteralClass, Empty) { } 512 513 const Expr *getSubExpr() const { return cast<Expr>(Val); } 514 Expr *getSubExpr() { return cast<Expr>(Val); } 515 void setSubExpr(Expr *E) { Val = E; } 516 517 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 518 static bool classof(const Stmt *T) { 519 return T->getStmtClass() == ImaginaryLiteralClass; 520 } 521 static bool classof(const ImaginaryLiteral *) { return true; } 522 523 // Iterators 524 virtual child_iterator child_begin(); 525 virtual child_iterator child_end(); 526}; 527 528/// StringLiteral - This represents a string literal expression, e.g. "foo" 529/// or L"bar" (wide strings). The actual string is returned by getStrData() 530/// is NOT null-terminated, and the length of the string is determined by 531/// calling getByteLength(). The C type for a string is always a 532/// ConstantArrayType. In C++, the char type is const qualified, in C it is 533/// not. 534/// 535/// Note that strings in C can be formed by concatenation of multiple string 536/// literal pptokens in translation phase #6. This keeps track of the locations 537/// of each of these pieces. 538/// 539/// Strings in C can also be truncated and extended by assigning into arrays, 540/// e.g. with constructs like: 541/// char X[2] = "foobar"; 542/// In this case, getByteLength() will return 6, but the string literal will 543/// have type "char[2]". 544class StringLiteral : public Expr { 545 const char *StrData; 546 unsigned ByteLength; 547 bool IsWide; 548 unsigned NumConcatenated; 549 SourceLocation TokLocs[1]; 550 551 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 552public: 553 /// This is the "fully general" constructor that allows representation of 554 /// strings formed from multiple concatenated tokens. 555 static StringLiteral *Create(ASTContext &C, const char *StrData, 556 unsigned ByteLength, bool Wide, QualType Ty, 557 const SourceLocation *Loc, unsigned NumStrs); 558 559 /// Simple constructor for string literals made from one token. 560 static StringLiteral *Create(ASTContext &C, const char *StrData, 561 unsigned ByteLength, 562 bool Wide, QualType Ty, SourceLocation Loc) { 563 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 564 } 565 566 /// \brief Construct an empty string literal. 567 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 568 569 StringLiteral* Clone(ASTContext &C) const; 570 void Destroy(ASTContext &C); 571 572 const char *getStrData() const { return StrData; } 573 unsigned getByteLength() const { return ByteLength; } 574 575 /// \brief Sets the string data to the given string data. 576 void setStrData(ASTContext &C, const char *Str, unsigned Len); 577 578 bool isWide() const { return IsWide; } 579 void setWide(bool W) { IsWide = W; } 580 581 bool containsNonAsciiOrNull() const { 582 for (unsigned i = 0; i < getByteLength(); ++i) 583 if (!isascii(getStrData()[i]) || !getStrData()[i]) 584 return true; 585 return false; 586 } 587 /// getNumConcatenated - Get the number of string literal tokens that were 588 /// concatenated in translation phase #6 to form this string literal. 589 unsigned getNumConcatenated() const { return NumConcatenated; } 590 591 SourceLocation getStrTokenLoc(unsigned TokNum) const { 592 assert(TokNum < NumConcatenated && "Invalid tok number"); 593 return TokLocs[TokNum]; 594 } 595 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 596 assert(TokNum < NumConcatenated && "Invalid tok number"); 597 TokLocs[TokNum] = L; 598 } 599 600 typedef const SourceLocation *tokloc_iterator; 601 tokloc_iterator tokloc_begin() const { return TokLocs; } 602 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 603 604 virtual SourceRange getSourceRange() const { 605 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 606 } 607 static bool classof(const Stmt *T) { 608 return T->getStmtClass() == StringLiteralClass; 609 } 610 static bool classof(const StringLiteral *) { return true; } 611 612 // Iterators 613 virtual child_iterator child_begin(); 614 virtual child_iterator child_end(); 615}; 616 617/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 618/// AST node is only formed if full location information is requested. 619class ParenExpr : public Expr { 620 SourceLocation L, R; 621 Stmt *Val; 622public: 623 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 624 : Expr(ParenExprClass, val->getType(), 625 val->isTypeDependent(), val->isValueDependent()), 626 L(l), R(r), Val(val) {} 627 628 /// \brief Construct an empty parenthesized expression. 629 explicit ParenExpr(EmptyShell Empty) 630 : Expr(ParenExprClass, Empty) { } 631 632 const Expr *getSubExpr() const { return cast<Expr>(Val); } 633 Expr *getSubExpr() { return cast<Expr>(Val); } 634 void setSubExpr(Expr *E) { Val = E; } 635 636 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 637 638 /// \brief Get the location of the left parentheses '('. 639 SourceLocation getLParen() const { return L; } 640 void setLParen(SourceLocation Loc) { L = Loc; } 641 642 /// \brief Get the location of the right parentheses ')'. 643 SourceLocation getRParen() const { return R; } 644 void setRParen(SourceLocation Loc) { R = Loc; } 645 646 static bool classof(const Stmt *T) { 647 return T->getStmtClass() == ParenExprClass; 648 } 649 static bool classof(const ParenExpr *) { return true; } 650 651 // Iterators 652 virtual child_iterator child_begin(); 653 virtual child_iterator child_end(); 654}; 655 656 657/// UnaryOperator - This represents the unary-expression's (except sizeof and 658/// alignof), the postinc/postdec operators from postfix-expression, and various 659/// extensions. 660/// 661/// Notes on various nodes: 662/// 663/// Real/Imag - These return the real/imag part of a complex operand. If 664/// applied to a non-complex value, the former returns its operand and the 665/// later returns zero in the type of the operand. 666/// 667/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 668/// subexpression is a compound literal with the various MemberExpr and 669/// ArraySubscriptExpr's applied to it. 670/// 671class UnaryOperator : public Expr { 672public: 673 // Note that additions to this should also update the StmtVisitor class. 674 enum Opcode { 675 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 676 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 677 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 678 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 679 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 680 Real, Imag, // "__real expr"/"__imag expr" Extension. 681 Extension, // __extension__ marker. 682 OffsetOf // __builtin_offsetof 683 }; 684private: 685 Stmt *Val; 686 Opcode Opc; 687 SourceLocation Loc; 688public: 689 690 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 691 : Expr(UnaryOperatorClass, type, 692 input->isTypeDependent() && opc != OffsetOf, 693 input->isValueDependent()), 694 Val(input), Opc(opc), Loc(l) {} 695 696 /// \brief Build an empty unary operator. 697 explicit UnaryOperator(EmptyShell Empty) 698 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 699 700 Opcode getOpcode() const { return Opc; } 701 void setOpcode(Opcode O) { Opc = O; } 702 703 Expr *getSubExpr() const { return cast<Expr>(Val); } 704 void setSubExpr(Expr *E) { Val = E; } 705 706 /// getOperatorLoc - Return the location of the operator. 707 SourceLocation getOperatorLoc() const { return Loc; } 708 void setOperatorLoc(SourceLocation L) { Loc = L; } 709 710 /// isPostfix - Return true if this is a postfix operation, like x++. 711 static bool isPostfix(Opcode Op) { 712 return Op == PostInc || Op == PostDec; 713 } 714 715 /// isPostfix - Return true if this is a prefix operation, like --x. 716 static bool isPrefix(Opcode Op) { 717 return Op == PreInc || Op == PreDec; 718 } 719 720 bool isPrefix() const { return isPrefix(Opc); } 721 bool isPostfix() const { return isPostfix(Opc); } 722 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 723 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 724 bool isOffsetOfOp() const { return Opc == OffsetOf; } 725 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 726 727 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 728 /// corresponds to, e.g. "sizeof" or "[pre]++" 729 static const char *getOpcodeStr(Opcode Op); 730 731 /// \brief Retrieve the unary opcode that corresponds to the given 732 /// overloaded operator. 733 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 734 735 /// \brief Retrieve the overloaded operator kind that corresponds to 736 /// the given unary opcode. 737 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 738 739 virtual SourceRange getSourceRange() const { 740 if (isPostfix()) 741 return SourceRange(Val->getLocStart(), Loc); 742 else 743 return SourceRange(Loc, Val->getLocEnd()); 744 } 745 virtual SourceLocation getExprLoc() const { return Loc; } 746 747 static bool classof(const Stmt *T) { 748 return T->getStmtClass() == UnaryOperatorClass; 749 } 750 static bool classof(const UnaryOperator *) { return true; } 751 752 // Iterators 753 virtual child_iterator child_begin(); 754 virtual child_iterator child_end(); 755}; 756 757/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 758/// types and expressions. 759class SizeOfAlignOfExpr : public Expr { 760 bool isSizeof : 1; // true if sizeof, false if alignof. 761 bool isType : 1; // true if operand is a type, false if an expression 762 union { 763 void *Ty; 764 Stmt *Ex; 765 } Argument; 766 SourceLocation OpLoc, RParenLoc; 767public: 768 SizeOfAlignOfExpr(bool issizeof, QualType T, 769 QualType resultType, SourceLocation op, 770 SourceLocation rp) : 771 Expr(SizeOfAlignOfExprClass, resultType, 772 false, // Never type-dependent (C++ [temp.dep.expr]p3). 773 // Value-dependent if the argument is type-dependent. 774 T->isDependentType()), 775 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 776 Argument.Ty = T.getAsOpaquePtr(); 777 } 778 779 SizeOfAlignOfExpr(bool issizeof, Expr *E, 780 QualType resultType, SourceLocation op, 781 SourceLocation rp) : 782 Expr(SizeOfAlignOfExprClass, resultType, 783 false, // Never type-dependent (C++ [temp.dep.expr]p3). 784 // Value-dependent if the argument is type-dependent. 785 E->isTypeDependent()), 786 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 787 Argument.Ex = E; 788 } 789 790 /// \brief Construct an empty sizeof/alignof expression. 791 explicit SizeOfAlignOfExpr(EmptyShell Empty) 792 : Expr(SizeOfAlignOfExprClass, Empty) { } 793 794 virtual void Destroy(ASTContext& C); 795 796 bool isSizeOf() const { return isSizeof; } 797 void setSizeof(bool S) { isSizeof = S; } 798 799 bool isArgumentType() const { return isType; } 800 QualType getArgumentType() const { 801 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 802 return QualType::getFromOpaquePtr(Argument.Ty); 803 } 804 Expr *getArgumentExpr() { 805 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 806 return static_cast<Expr*>(Argument.Ex); 807 } 808 const Expr *getArgumentExpr() const { 809 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 810 } 811 812 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 813 void setArgument(QualType T) { 814 Argument.Ty = T.getAsOpaquePtr(); 815 isType = true; 816 } 817 818 /// Gets the argument type, or the type of the argument expression, whichever 819 /// is appropriate. 820 QualType getTypeOfArgument() const { 821 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 822 } 823 824 SourceLocation getOperatorLoc() const { return OpLoc; } 825 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 826 827 SourceLocation getRParenLoc() const { return RParenLoc; } 828 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 829 830 virtual SourceRange getSourceRange() const { 831 return SourceRange(OpLoc, RParenLoc); 832 } 833 834 static bool classof(const Stmt *T) { 835 return T->getStmtClass() == SizeOfAlignOfExprClass; 836 } 837 static bool classof(const SizeOfAlignOfExpr *) { return true; } 838 839 // Iterators 840 virtual child_iterator child_begin(); 841 virtual child_iterator child_end(); 842}; 843 844//===----------------------------------------------------------------------===// 845// Postfix Operators. 846//===----------------------------------------------------------------------===// 847 848/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 849class ArraySubscriptExpr : public Expr { 850 enum { LHS, RHS, END_EXPR=2 }; 851 Stmt* SubExprs[END_EXPR]; 852 SourceLocation RBracketLoc; 853public: 854 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 855 SourceLocation rbracketloc) 856 : Expr(ArraySubscriptExprClass, t, 857 lhs->isTypeDependent() || rhs->isTypeDependent(), 858 lhs->isValueDependent() || rhs->isValueDependent()), 859 RBracketLoc(rbracketloc) { 860 SubExprs[LHS] = lhs; 861 SubExprs[RHS] = rhs; 862 } 863 864 /// \brief Create an empty array subscript expression. 865 explicit ArraySubscriptExpr(EmptyShell Shell) 866 : Expr(ArraySubscriptExprClass, Shell) { } 867 868 /// An array access can be written A[4] or 4[A] (both are equivalent). 869 /// - getBase() and getIdx() always present the normalized view: A[4]. 870 /// In this case getBase() returns "A" and getIdx() returns "4". 871 /// - getLHS() and getRHS() present the syntactic view. e.g. for 872 /// 4[A] getLHS() returns "4". 873 /// Note: Because vector element access is also written A[4] we must 874 /// predicate the format conversion in getBase and getIdx only on the 875 /// the type of the RHS, as it is possible for the LHS to be a vector of 876 /// integer type 877 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 878 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 879 void setLHS(Expr *E) { SubExprs[LHS] = E; } 880 881 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 882 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 883 void setRHS(Expr *E) { SubExprs[RHS] = E; } 884 885 Expr *getBase() { 886 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 887 } 888 889 const Expr *getBase() const { 890 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 891 } 892 893 Expr *getIdx() { 894 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 895 } 896 897 const Expr *getIdx() const { 898 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 899 } 900 901 virtual SourceRange getSourceRange() const { 902 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 903 } 904 905 SourceLocation getRBracketLoc() const { return RBracketLoc; } 906 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 907 908 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 909 910 static bool classof(const Stmt *T) { 911 return T->getStmtClass() == ArraySubscriptExprClass; 912 } 913 static bool classof(const ArraySubscriptExpr *) { return true; } 914 915 // Iterators 916 virtual child_iterator child_begin(); 917 virtual child_iterator child_end(); 918}; 919 920 921/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 922/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 923/// while its subclasses may represent alternative syntax that (semantically) 924/// results in a function call. For example, CXXOperatorCallExpr is 925/// a subclass for overloaded operator calls that use operator syntax, e.g., 926/// "str1 + str2" to resolve to a function call. 927class CallExpr : public Expr { 928 enum { FN=0, ARGS_START=1 }; 929 Stmt **SubExprs; 930 unsigned NumArgs; 931 SourceLocation RParenLoc; 932 933 // This version of the ctor is for deserialization. 934 CallExpr(StmtClass SC, Stmt** subexprs, unsigned numargs, QualType t, 935 SourceLocation rparenloc) 936 : Expr(SC,t), SubExprs(subexprs), 937 NumArgs(numargs), RParenLoc(rparenloc) {} 938 939protected: 940 // This version of the constructor is for derived classes. 941 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 942 QualType t, SourceLocation rparenloc); 943 944public: 945 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 946 SourceLocation rparenloc); 947 948 /// \brief Build an empty call expression. 949 CallExpr(ASTContext &C, EmptyShell Empty); 950 951 ~CallExpr() {} 952 953 void Destroy(ASTContext& C); 954 955 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 956 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 957 void setCallee(Expr *F) { SubExprs[FN] = F; } 958 959 /// getNumArgs - Return the number of actual arguments to this call. 960 /// 961 unsigned getNumArgs() const { return NumArgs; } 962 963 /// getArg - Return the specified argument. 964 Expr *getArg(unsigned Arg) { 965 assert(Arg < NumArgs && "Arg access out of range!"); 966 return cast<Expr>(SubExprs[Arg+ARGS_START]); 967 } 968 const Expr *getArg(unsigned Arg) const { 969 assert(Arg < NumArgs && "Arg access out of range!"); 970 return cast<Expr>(SubExprs[Arg+ARGS_START]); 971 } 972 973 /// setArg - Set the specified argument. 974 void setArg(unsigned Arg, Expr *ArgExpr) { 975 assert(Arg < NumArgs && "Arg access out of range!"); 976 SubExprs[Arg+ARGS_START] = ArgExpr; 977 } 978 979 /// setNumArgs - This changes the number of arguments present in this call. 980 /// Any orphaned expressions are deleted by this, and any new operands are set 981 /// to null. 982 void setNumArgs(ASTContext& C, unsigned NumArgs); 983 984 typedef ExprIterator arg_iterator; 985 typedef ConstExprIterator const_arg_iterator; 986 987 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 988 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 989 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 990 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 991 992 /// getNumCommas - Return the number of commas that must have been present in 993 /// this function call. 994 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 995 996 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 997 /// not, return 0. 998 unsigned isBuiltinCall(ASTContext &Context) const; 999 1000 SourceLocation getRParenLoc() const { return RParenLoc; } 1001 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1002 1003 virtual SourceRange getSourceRange() const { 1004 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1005 } 1006 1007 static bool classof(const Stmt *T) { 1008 return T->getStmtClass() == CallExprClass || 1009 T->getStmtClass() == CXXOperatorCallExprClass || 1010 T->getStmtClass() == CXXMemberCallExprClass; 1011 } 1012 static bool classof(const CallExpr *) { return true; } 1013 static bool classof(const CXXOperatorCallExpr *) { return true; } 1014 static bool classof(const CXXMemberCallExpr *) { return true; } 1015 1016 // Iterators 1017 virtual child_iterator child_begin(); 1018 virtual child_iterator child_end(); 1019}; 1020 1021/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1022/// 1023class MemberExpr : public Expr { 1024 /// Base - the expression for the base pointer or structure references. In 1025 /// X.F, this is "X". 1026 Stmt *Base; 1027 1028 /// MemberDecl - This is the decl being referenced by the field/member name. 1029 /// In X.F, this is the decl referenced by F. 1030 NamedDecl *MemberDecl; 1031 1032 /// MemberLoc - This is the location of the member name. 1033 SourceLocation MemberLoc; 1034 1035 /// IsArrow - True if this is "X->F", false if this is "X.F". 1036 bool IsArrow; 1037public: 1038 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1039 QualType ty) 1040 : Expr(MemberExprClass, ty), 1041 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 1042 1043 /// \brief Build an empty member reference expression. 1044 explicit MemberExpr(EmptyShell Empty) : Expr(MemberExprClass, Empty) { } 1045 1046 void setBase(Expr *E) { Base = E; } 1047 Expr *getBase() const { return cast<Expr>(Base); } 1048 1049 /// \brief Retrieve the member declaration to which this expression refers. 1050 /// 1051 /// The returned declaration will either be a FieldDecl or (in C++) 1052 /// a CXXMethodDecl. 1053 NamedDecl *getMemberDecl() const { return MemberDecl; } 1054 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1055 1056 bool isArrow() const { return IsArrow; } 1057 void setArrow(bool A) { IsArrow = A; } 1058 1059 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1060 /// location of 'F'. 1061 SourceLocation getMemberLoc() const { return MemberLoc; } 1062 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1063 1064 virtual SourceRange getSourceRange() const { 1065 // If we have an implicit base (like a C++ implicit this), 1066 // make sure not to return its location 1067 SourceLocation BaseLoc = getBase()->getLocStart(); 1068 if (BaseLoc.isInvalid()) 1069 return SourceRange(MemberLoc, MemberLoc); 1070 return SourceRange(BaseLoc, MemberLoc); 1071 } 1072 1073 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1074 1075 static bool classof(const Stmt *T) { 1076 return T->getStmtClass() == MemberExprClass; 1077 } 1078 static bool classof(const MemberExpr *) { return true; } 1079 1080 // Iterators 1081 virtual child_iterator child_begin(); 1082 virtual child_iterator child_end(); 1083}; 1084 1085/// CompoundLiteralExpr - [C99 6.5.2.5] 1086/// 1087class CompoundLiteralExpr : public Expr { 1088 /// LParenLoc - If non-null, this is the location of the left paren in a 1089 /// compound literal like "(int){4}". This can be null if this is a 1090 /// synthesized compound expression. 1091 SourceLocation LParenLoc; 1092 Stmt *Init; 1093 bool FileScope; 1094public: 1095 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1096 bool fileScope) 1097 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1098 FileScope(fileScope) {} 1099 1100 /// \brief Construct an empty compound literal. 1101 explicit CompoundLiteralExpr(EmptyShell Empty) 1102 : Expr(CompoundLiteralExprClass, Empty) { } 1103 1104 const Expr *getInitializer() const { return cast<Expr>(Init); } 1105 Expr *getInitializer() { return cast<Expr>(Init); } 1106 void setInitializer(Expr *E) { Init = E; } 1107 1108 bool isFileScope() const { return FileScope; } 1109 void setFileScope(bool FS) { FileScope = FS; } 1110 1111 SourceLocation getLParenLoc() const { return LParenLoc; } 1112 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1113 1114 virtual SourceRange getSourceRange() const { 1115 // FIXME: Init should never be null. 1116 if (!Init) 1117 return SourceRange(); 1118 if (LParenLoc.isInvalid()) 1119 return Init->getSourceRange(); 1120 return SourceRange(LParenLoc, Init->getLocEnd()); 1121 } 1122 1123 static bool classof(const Stmt *T) { 1124 return T->getStmtClass() == CompoundLiteralExprClass; 1125 } 1126 static bool classof(const CompoundLiteralExpr *) { return true; } 1127 1128 // Iterators 1129 virtual child_iterator child_begin(); 1130 virtual child_iterator child_end(); 1131}; 1132 1133/// CastExpr - Base class for type casts, including both implicit 1134/// casts (ImplicitCastExpr) and explicit casts that have some 1135/// representation in the source code (ExplicitCastExpr's derived 1136/// classes). 1137class CastExpr : public Expr { 1138 Stmt *Op; 1139protected: 1140 CastExpr(StmtClass SC, QualType ty, Expr *op) : 1141 Expr(SC, ty, 1142 // Cast expressions are type-dependent if the type is 1143 // dependent (C++ [temp.dep.expr]p3). 1144 ty->isDependentType(), 1145 // Cast expressions are value-dependent if the type is 1146 // dependent or if the subexpression is value-dependent. 1147 ty->isDependentType() || (op && op->isValueDependent())), 1148 Op(op) {} 1149 1150 /// \brief Construct an empty cast. 1151 CastExpr(StmtClass SC, EmptyShell Empty) 1152 : Expr(SC, Empty) { } 1153 1154public: 1155 Expr *getSubExpr() { return cast<Expr>(Op); } 1156 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1157 void setSubExpr(Expr *E) { Op = E; } 1158 1159 static bool classof(const Stmt *T) { 1160 StmtClass SC = T->getStmtClass(); 1161 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1162 return true; 1163 1164 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1165 return true; 1166 1167 return false; 1168 } 1169 static bool classof(const CastExpr *) { return true; } 1170 1171 // Iterators 1172 virtual child_iterator child_begin(); 1173 virtual child_iterator child_end(); 1174}; 1175 1176/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1177/// conversions, which have no direct representation in the original 1178/// source code. For example: converting T[]->T*, void f()->void 1179/// (*f)(), float->double, short->int, etc. 1180/// 1181/// In C, implicit casts always produce rvalues. However, in C++, an 1182/// implicit cast whose result is being bound to a reference will be 1183/// an lvalue. For example: 1184/// 1185/// @code 1186/// class Base { }; 1187/// class Derived : public Base { }; 1188/// void f(Derived d) { 1189/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1190/// } 1191/// @endcode 1192class ImplicitCastExpr : public CastExpr { 1193 /// LvalueCast - Whether this cast produces an lvalue. 1194 bool LvalueCast; 1195 1196public: 1197 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 1198 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 1199 1200 /// \brief Construct an empty implicit cast. 1201 explicit ImplicitCastExpr(EmptyShell Shell) 1202 : CastExpr(ImplicitCastExprClass, Shell) { } 1203 1204 1205 virtual SourceRange getSourceRange() const { 1206 return getSubExpr()->getSourceRange(); 1207 } 1208 1209 /// isLvalueCast - Whether this cast produces an lvalue. 1210 bool isLvalueCast() const { return LvalueCast; } 1211 1212 /// setLvalueCast - Set whether this cast produces an lvalue. 1213 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1214 1215 static bool classof(const Stmt *T) { 1216 return T->getStmtClass() == ImplicitCastExprClass; 1217 } 1218 static bool classof(const ImplicitCastExpr *) { return true; } 1219}; 1220 1221/// ExplicitCastExpr - An explicit cast written in the source 1222/// code. 1223/// 1224/// This class is effectively an abstract class, because it provides 1225/// the basic representation of an explicitly-written cast without 1226/// specifying which kind of cast (C cast, functional cast, static 1227/// cast, etc.) was written; specific derived classes represent the 1228/// particular style of cast and its location information. 1229/// 1230/// Unlike implicit casts, explicit cast nodes have two different 1231/// types: the type that was written into the source code, and the 1232/// actual type of the expression as determined by semantic 1233/// analysis. These types may differ slightly. For example, in C++ one 1234/// can cast to a reference type, which indicates that the resulting 1235/// expression will be an lvalue. The reference type, however, will 1236/// not be used as the type of the expression. 1237class ExplicitCastExpr : public CastExpr { 1238 /// TypeAsWritten - The type that this expression is casting to, as 1239 /// written in the source code. 1240 QualType TypeAsWritten; 1241 1242protected: 1243 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1244 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1245 1246 /// \brief Construct an empty explicit cast. 1247 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1248 : CastExpr(SC, Shell) { } 1249 1250public: 1251 /// getTypeAsWritten - Returns the type that this expression is 1252 /// casting to, as written in the source code. 1253 QualType getTypeAsWritten() const { return TypeAsWritten; } 1254 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1255 1256 static bool classof(const Stmt *T) { 1257 StmtClass SC = T->getStmtClass(); 1258 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1259 return true; 1260 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1261 return true; 1262 1263 return false; 1264 } 1265 static bool classof(const ExplicitCastExpr *) { return true; } 1266}; 1267 1268/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1269/// cast in C++ (C++ [expr.cast]), which uses the syntax 1270/// (Type)expr. For example: @c (int)f. 1271class CStyleCastExpr : public ExplicitCastExpr { 1272 SourceLocation LPLoc; // the location of the left paren 1273 SourceLocation RPLoc; // the location of the right paren 1274public: 1275 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1276 SourceLocation l, SourceLocation r) : 1277 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1278 LPLoc(l), RPLoc(r) {} 1279 1280 /// \brief Construct an empty C-style explicit cast. 1281 explicit CStyleCastExpr(EmptyShell Shell) 1282 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1283 1284 SourceLocation getLParenLoc() const { return LPLoc; } 1285 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1286 1287 SourceLocation getRParenLoc() const { return RPLoc; } 1288 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1289 1290 virtual SourceRange getSourceRange() const { 1291 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1292 } 1293 static bool classof(const Stmt *T) { 1294 return T->getStmtClass() == CStyleCastExprClass; 1295 } 1296 static bool classof(const CStyleCastExpr *) { return true; } 1297}; 1298 1299/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1300/// 1301/// This expression node kind describes a builtin binary operation, 1302/// such as "x + y" for integer values "x" and "y". The operands will 1303/// already have been converted to appropriate types (e.g., by 1304/// performing promotions or conversions). 1305/// 1306/// In C++, where operators may be overloaded, a different kind of 1307/// expression node (CXXOperatorCallExpr) is used to express the 1308/// invocation of an overloaded operator with operator syntax. Within 1309/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1310/// used to store an expression "x + y" depends on the subexpressions 1311/// for x and y. If neither x or y is type-dependent, and the "+" 1312/// operator resolves to a built-in operation, BinaryOperator will be 1313/// used to express the computation (x and y may still be 1314/// value-dependent). If either x or y is type-dependent, or if the 1315/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1316/// be used to express the computation. 1317class BinaryOperator : public Expr { 1318public: 1319 enum Opcode { 1320 // Operators listed in order of precedence. 1321 // Note that additions to this should also update the StmtVisitor class. 1322 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1323 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1324 Add, Sub, // [C99 6.5.6] Additive operators. 1325 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1326 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1327 EQ, NE, // [C99 6.5.9] Equality operators. 1328 And, // [C99 6.5.10] Bitwise AND operator. 1329 Xor, // [C99 6.5.11] Bitwise XOR operator. 1330 Or, // [C99 6.5.12] Bitwise OR operator. 1331 LAnd, // [C99 6.5.13] Logical AND operator. 1332 LOr, // [C99 6.5.14] Logical OR operator. 1333 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1334 DivAssign, RemAssign, 1335 AddAssign, SubAssign, 1336 ShlAssign, ShrAssign, 1337 AndAssign, XorAssign, 1338 OrAssign, 1339 Comma // [C99 6.5.17] Comma operator. 1340 }; 1341private: 1342 enum { LHS, RHS, END_EXPR }; 1343 Stmt* SubExprs[END_EXPR]; 1344 Opcode Opc; 1345 SourceLocation OpLoc; 1346public: 1347 1348 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1349 SourceLocation opLoc) 1350 : Expr(BinaryOperatorClass, ResTy, 1351 lhs->isTypeDependent() || rhs->isTypeDependent(), 1352 lhs->isValueDependent() || rhs->isValueDependent()), 1353 Opc(opc), OpLoc(opLoc) { 1354 SubExprs[LHS] = lhs; 1355 SubExprs[RHS] = rhs; 1356 assert(!isCompoundAssignmentOp() && 1357 "Use ArithAssignBinaryOperator for compound assignments"); 1358 } 1359 1360 /// \brief Construct an empty binary operator. 1361 explicit BinaryOperator(EmptyShell Empty) 1362 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1363 1364 SourceLocation getOperatorLoc() const { return OpLoc; } 1365 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1366 1367 Opcode getOpcode() const { return Opc; } 1368 void setOpcode(Opcode O) { Opc = O; } 1369 1370 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1371 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1372 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1373 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1374 1375 virtual SourceRange getSourceRange() const { 1376 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1377 } 1378 1379 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1380 /// corresponds to, e.g. "<<=". 1381 static const char *getOpcodeStr(Opcode Op); 1382 1383 /// \brief Retrieve the binary opcode that corresponds to the given 1384 /// overloaded operator. 1385 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1386 1387 /// \brief Retrieve the overloaded operator kind that corresponds to 1388 /// the given binary opcode. 1389 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1390 1391 /// predicates to categorize the respective opcodes. 1392 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1393 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1394 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1395 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1396 1397 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1398 bool isRelationalOp() const { return isRelationalOp(Opc); } 1399 1400 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1401 bool isEqualityOp() const { return isEqualityOp(Opc); } 1402 1403 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1404 bool isLogicalOp() const { return isLogicalOp(Opc); } 1405 1406 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1407 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1408 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1409 1410 static bool classof(const Stmt *S) { 1411 return S->getStmtClass() == BinaryOperatorClass || 1412 S->getStmtClass() == CompoundAssignOperatorClass; 1413 } 1414 static bool classof(const BinaryOperator *) { return true; } 1415 1416 // Iterators 1417 virtual child_iterator child_begin(); 1418 virtual child_iterator child_end(); 1419 1420protected: 1421 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1422 SourceLocation oploc, bool dead) 1423 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1424 SubExprs[LHS] = lhs; 1425 SubExprs[RHS] = rhs; 1426 } 1427 1428 BinaryOperator(StmtClass SC, EmptyShell Empty) 1429 : Expr(SC, Empty), Opc(MulAssign) { } 1430}; 1431 1432/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1433/// track of the type the operation is performed in. Due to the semantics of 1434/// these operators, the operands are promoted, the aritmetic performed, an 1435/// implicit conversion back to the result type done, then the assignment takes 1436/// place. This captures the intermediate type which the computation is done 1437/// in. 1438class CompoundAssignOperator : public BinaryOperator { 1439 QualType ComputationLHSType; 1440 QualType ComputationResultType; 1441public: 1442 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1443 QualType ResType, QualType CompLHSType, 1444 QualType CompResultType, 1445 SourceLocation OpLoc) 1446 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1447 ComputationLHSType(CompLHSType), 1448 ComputationResultType(CompResultType) { 1449 assert(isCompoundAssignmentOp() && 1450 "Only should be used for compound assignments"); 1451 } 1452 1453 /// \brief Build an empty compound assignment operator expression. 1454 explicit CompoundAssignOperator(EmptyShell Empty) 1455 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 1456 1457 // The two computation types are the type the LHS is converted 1458 // to for the computation and the type of the result; the two are 1459 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1460 QualType getComputationLHSType() const { return ComputationLHSType; } 1461 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 1462 1463 QualType getComputationResultType() const { return ComputationResultType; } 1464 void setComputationResultType(QualType T) { ComputationResultType = T; } 1465 1466 static bool classof(const CompoundAssignOperator *) { return true; } 1467 static bool classof(const Stmt *S) { 1468 return S->getStmtClass() == CompoundAssignOperatorClass; 1469 } 1470}; 1471 1472/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1473/// GNU "missing LHS" extension is in use. 1474/// 1475class ConditionalOperator : public Expr { 1476 enum { COND, LHS, RHS, END_EXPR }; 1477 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1478public: 1479 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1480 : Expr(ConditionalOperatorClass, t, 1481 // FIXME: the type of the conditional operator doesn't 1482 // depend on the type of the conditional, but the standard 1483 // seems to imply that it could. File a bug! 1484 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1485 (cond->isValueDependent() || 1486 (lhs && lhs->isValueDependent()) || 1487 (rhs && rhs->isValueDependent()))) { 1488 SubExprs[COND] = cond; 1489 SubExprs[LHS] = lhs; 1490 SubExprs[RHS] = rhs; 1491 } 1492 1493 /// \brief Build an empty conditional operator. 1494 explicit ConditionalOperator(EmptyShell Empty) 1495 : Expr(ConditionalOperatorClass, Empty) { } 1496 1497 // getCond - Return the expression representing the condition for 1498 // the ?: operator. 1499 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1500 void setCond(Expr *E) { SubExprs[COND] = E; } 1501 1502 // getTrueExpr - Return the subexpression representing the value of the ?: 1503 // expression if the condition evaluates to true. In most cases this value 1504 // will be the same as getLHS() except a GCC extension allows the left 1505 // subexpression to be omitted, and instead of the condition be returned. 1506 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1507 // is only evaluated once. 1508 Expr *getTrueExpr() const { 1509 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1510 } 1511 1512 // getTrueExpr - Return the subexpression representing the value of the ?: 1513 // expression if the condition evaluates to false. This is the same as getRHS. 1514 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1515 1516 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1517 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1518 1519 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1520 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1521 1522 virtual SourceRange getSourceRange() const { 1523 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1524 } 1525 static bool classof(const Stmt *T) { 1526 return T->getStmtClass() == ConditionalOperatorClass; 1527 } 1528 static bool classof(const ConditionalOperator *) { return true; } 1529 1530 // Iterators 1531 virtual child_iterator child_begin(); 1532 virtual child_iterator child_end(); 1533}; 1534 1535/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1536class AddrLabelExpr : public Expr { 1537 SourceLocation AmpAmpLoc, LabelLoc; 1538 LabelStmt *Label; 1539public: 1540 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1541 QualType t) 1542 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1543 1544 /// \brief Build an empty address of a label expression. 1545 explicit AddrLabelExpr(EmptyShell Empty) 1546 : Expr(AddrLabelExprClass, Empty) { } 1547 1548 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 1549 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 1550 SourceLocation getLabelLoc() const { return LabelLoc; } 1551 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 1552 1553 virtual SourceRange getSourceRange() const { 1554 return SourceRange(AmpAmpLoc, LabelLoc); 1555 } 1556 1557 LabelStmt *getLabel() const { return Label; } 1558 void setLabel(LabelStmt *S) { Label = S; } 1559 1560 static bool classof(const Stmt *T) { 1561 return T->getStmtClass() == AddrLabelExprClass; 1562 } 1563 static bool classof(const AddrLabelExpr *) { return true; } 1564 1565 // Iterators 1566 virtual child_iterator child_begin(); 1567 virtual child_iterator child_end(); 1568}; 1569 1570/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1571/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1572/// takes the value of the last subexpression. 1573class StmtExpr : public Expr { 1574 Stmt *SubStmt; 1575 SourceLocation LParenLoc, RParenLoc; 1576public: 1577 StmtExpr(CompoundStmt *substmt, QualType T, 1578 SourceLocation lp, SourceLocation rp) : 1579 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1580 1581 /// \brief Build an empty statement expression. 1582 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 1583 1584 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1585 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1586 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 1587 1588 virtual SourceRange getSourceRange() const { 1589 return SourceRange(LParenLoc, RParenLoc); 1590 } 1591 1592 SourceLocation getLParenLoc() const { return LParenLoc; } 1593 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1594 SourceLocation getRParenLoc() const { return RParenLoc; } 1595 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1596 1597 static bool classof(const Stmt *T) { 1598 return T->getStmtClass() == StmtExprClass; 1599 } 1600 static bool classof(const StmtExpr *) { return true; } 1601 1602 // Iterators 1603 virtual child_iterator child_begin(); 1604 virtual child_iterator child_end(); 1605}; 1606 1607/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1608/// This AST node represents a function that returns 1 if two *types* (not 1609/// expressions) are compatible. The result of this built-in function can be 1610/// used in integer constant expressions. 1611class TypesCompatibleExpr : public Expr { 1612 QualType Type1; 1613 QualType Type2; 1614 SourceLocation BuiltinLoc, RParenLoc; 1615public: 1616 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1617 QualType t1, QualType t2, SourceLocation RP) : 1618 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1619 BuiltinLoc(BLoc), RParenLoc(RP) {} 1620 1621 /// \brief Build an empty __builtin_type_compatible_p expression. 1622 explicit TypesCompatibleExpr(EmptyShell Empty) 1623 : Expr(TypesCompatibleExprClass, Empty) { } 1624 1625 QualType getArgType1() const { return Type1; } 1626 void setArgType1(QualType T) { Type1 = T; } 1627 QualType getArgType2() const { return Type2; } 1628 void setArgType2(QualType T) { Type2 = T; } 1629 1630 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1631 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1632 1633 SourceLocation getRParenLoc() const { return RParenLoc; } 1634 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1635 1636 virtual SourceRange getSourceRange() const { 1637 return SourceRange(BuiltinLoc, RParenLoc); 1638 } 1639 static bool classof(const Stmt *T) { 1640 return T->getStmtClass() == TypesCompatibleExprClass; 1641 } 1642 static bool classof(const TypesCompatibleExpr *) { return true; } 1643 1644 // Iterators 1645 virtual child_iterator child_begin(); 1646 virtual child_iterator child_end(); 1647}; 1648 1649/// ShuffleVectorExpr - clang-specific builtin-in function 1650/// __builtin_shufflevector. 1651/// This AST node represents a operator that does a constant 1652/// shuffle, similar to LLVM's shufflevector instruction. It takes 1653/// two vectors and a variable number of constant indices, 1654/// and returns the appropriately shuffled vector. 1655class ShuffleVectorExpr : public Expr { 1656 SourceLocation BuiltinLoc, RParenLoc; 1657 1658 // SubExprs - the list of values passed to the __builtin_shufflevector 1659 // function. The first two are vectors, and the rest are constant 1660 // indices. The number of values in this list is always 1661 // 2+the number of indices in the vector type. 1662 Stmt **SubExprs; 1663 unsigned NumExprs; 1664 1665public: 1666 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1667 QualType Type, SourceLocation BLoc, 1668 SourceLocation RP) : 1669 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1670 RParenLoc(RP), NumExprs(nexpr) { 1671 1672 SubExprs = new Stmt*[nexpr]; 1673 for (unsigned i = 0; i < nexpr; i++) 1674 SubExprs[i] = args[i]; 1675 } 1676 1677 /// \brief Build an empty vector-shuffle expression. 1678 explicit ShuffleVectorExpr(EmptyShell Empty) 1679 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 1680 1681 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1682 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1683 1684 SourceLocation getRParenLoc() const { return RParenLoc; } 1685 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1686 1687 virtual SourceRange getSourceRange() const { 1688 return SourceRange(BuiltinLoc, RParenLoc); 1689 } 1690 static bool classof(const Stmt *T) { 1691 return T->getStmtClass() == ShuffleVectorExprClass; 1692 } 1693 static bool classof(const ShuffleVectorExpr *) { return true; } 1694 1695 ~ShuffleVectorExpr() { 1696 delete [] SubExprs; 1697 } 1698 1699 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1700 /// constant expression, the actual arguments passed in, and the function 1701 /// pointers. 1702 unsigned getNumSubExprs() const { return NumExprs; } 1703 1704 /// getExpr - Return the Expr at the specified index. 1705 Expr *getExpr(unsigned Index) { 1706 assert((Index < NumExprs) && "Arg access out of range!"); 1707 return cast<Expr>(SubExprs[Index]); 1708 } 1709 const Expr *getExpr(unsigned Index) const { 1710 assert((Index < NumExprs) && "Arg access out of range!"); 1711 return cast<Expr>(SubExprs[Index]); 1712 } 1713 1714 void setExprs(Expr ** Exprs, unsigned NumExprs); 1715 1716 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1717 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1718 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 1719 } 1720 1721 // Iterators 1722 virtual child_iterator child_begin(); 1723 virtual child_iterator child_end(); 1724}; 1725 1726/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1727/// This AST node is similar to the conditional operator (?:) in C, with 1728/// the following exceptions: 1729/// - the test expression must be a integer constant expression. 1730/// - the expression returned acts like the chosen subexpression in every 1731/// visible way: the type is the same as that of the chosen subexpression, 1732/// and all predicates (whether it's an l-value, whether it's an integer 1733/// constant expression, etc.) return the same result as for the chosen 1734/// sub-expression. 1735class ChooseExpr : public Expr { 1736 enum { COND, LHS, RHS, END_EXPR }; 1737 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1738 SourceLocation BuiltinLoc, RParenLoc; 1739public: 1740 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1741 SourceLocation RP) 1742 : Expr(ChooseExprClass, t), 1743 BuiltinLoc(BLoc), RParenLoc(RP) { 1744 SubExprs[COND] = cond; 1745 SubExprs[LHS] = lhs; 1746 SubExprs[RHS] = rhs; 1747 } 1748 1749 /// \brief Build an empty __builtin_choose_expr. 1750 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 1751 1752 /// isConditionTrue - Return whether the condition is true (i.e. not 1753 /// equal to zero). 1754 bool isConditionTrue(ASTContext &C) const; 1755 1756 /// getChosenSubExpr - Return the subexpression chosen according to the 1757 /// condition. 1758 Expr *getChosenSubExpr(ASTContext &C) const { 1759 return isConditionTrue(C) ? getLHS() : getRHS(); 1760 } 1761 1762 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1763 void setCond(Expr *E) { SubExprs[COND] = E; } 1764 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1765 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1766 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1767 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1768 1769 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1770 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1771 1772 SourceLocation getRParenLoc() const { return RParenLoc; } 1773 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1774 1775 virtual SourceRange getSourceRange() const { 1776 return SourceRange(BuiltinLoc, RParenLoc); 1777 } 1778 static bool classof(const Stmt *T) { 1779 return T->getStmtClass() == ChooseExprClass; 1780 } 1781 static bool classof(const ChooseExpr *) { return true; } 1782 1783 // Iterators 1784 virtual child_iterator child_begin(); 1785 virtual child_iterator child_end(); 1786}; 1787 1788/// GNUNullExpr - Implements the GNU __null extension, which is a name 1789/// for a null pointer constant that has integral type (e.g., int or 1790/// long) and is the same size and alignment as a pointer. The __null 1791/// extension is typically only used by system headers, which define 1792/// NULL as __null in C++ rather than using 0 (which is an integer 1793/// that may not match the size of a pointer). 1794class GNUNullExpr : public Expr { 1795 /// TokenLoc - The location of the __null keyword. 1796 SourceLocation TokenLoc; 1797 1798public: 1799 GNUNullExpr(QualType Ty, SourceLocation Loc) 1800 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1801 1802 /// \brief Build an empty GNU __null expression. 1803 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 1804 1805 /// getTokenLocation - The location of the __null token. 1806 SourceLocation getTokenLocation() const { return TokenLoc; } 1807 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 1808 1809 virtual SourceRange getSourceRange() const { 1810 return SourceRange(TokenLoc); 1811 } 1812 static bool classof(const Stmt *T) { 1813 return T->getStmtClass() == GNUNullExprClass; 1814 } 1815 static bool classof(const GNUNullExpr *) { return true; } 1816 1817 // Iterators 1818 virtual child_iterator child_begin(); 1819 virtual child_iterator child_end(); 1820}; 1821 1822/// VAArgExpr, used for the builtin function __builtin_va_start. 1823class VAArgExpr : public Expr { 1824 Stmt *Val; 1825 SourceLocation BuiltinLoc, RParenLoc; 1826public: 1827 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1828 : Expr(VAArgExprClass, t), 1829 Val(e), 1830 BuiltinLoc(BLoc), 1831 RParenLoc(RPLoc) { } 1832 1833 /// \brief Create an empty __builtin_va_start expression. 1834 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 1835 1836 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1837 Expr *getSubExpr() { return cast<Expr>(Val); } 1838 void setSubExpr(Expr *E) { Val = E; } 1839 1840 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 1841 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 1842 1843 SourceLocation getRParenLoc() const { return RParenLoc; } 1844 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1845 1846 virtual SourceRange getSourceRange() const { 1847 return SourceRange(BuiltinLoc, RParenLoc); 1848 } 1849 static bool classof(const Stmt *T) { 1850 return T->getStmtClass() == VAArgExprClass; 1851 } 1852 static bool classof(const VAArgExpr *) { return true; } 1853 1854 // Iterators 1855 virtual child_iterator child_begin(); 1856 virtual child_iterator child_end(); 1857}; 1858 1859/// @brief Describes an C or C++ initializer list. 1860/// 1861/// InitListExpr describes an initializer list, which can be used to 1862/// initialize objects of different types, including 1863/// struct/class/union types, arrays, and vectors. For example: 1864/// 1865/// @code 1866/// struct foo x = { 1, { 2, 3 } }; 1867/// @endcode 1868/// 1869/// Prior to semantic analysis, an initializer list will represent the 1870/// initializer list as written by the user, but will have the 1871/// placeholder type "void". This initializer list is called the 1872/// syntactic form of the initializer, and may contain C99 designated 1873/// initializers (represented as DesignatedInitExprs), initializations 1874/// of subobject members without explicit braces, and so on. Clients 1875/// interested in the original syntax of the initializer list should 1876/// use the syntactic form of the initializer list. 1877/// 1878/// After semantic analysis, the initializer list will represent the 1879/// semantic form of the initializer, where the initializations of all 1880/// subobjects are made explicit with nested InitListExpr nodes and 1881/// C99 designators have been eliminated by placing the designated 1882/// initializations into the subobject they initialize. Additionally, 1883/// any "holes" in the initialization, where no initializer has been 1884/// specified for a particular subobject, will be replaced with 1885/// implicitly-generated ImplicitValueInitExpr expressions that 1886/// value-initialize the subobjects. Note, however, that the 1887/// initializer lists may still have fewer initializers than there are 1888/// elements to initialize within the object. 1889/// 1890/// Given the semantic form of the initializer list, one can retrieve 1891/// the original syntactic form of that initializer list (if it 1892/// exists) using getSyntacticForm(). Since many initializer lists 1893/// have the same syntactic and semantic forms, getSyntacticForm() may 1894/// return NULL, indicating that the current initializer list also 1895/// serves as its syntactic form. 1896class InitListExpr : public Expr { 1897 std::vector<Stmt *> InitExprs; 1898 SourceLocation LBraceLoc, RBraceLoc; 1899 1900 /// Contains the initializer list that describes the syntactic form 1901 /// written in the source code. 1902 InitListExpr *SyntacticForm; 1903 1904 /// If this initializer list initializes a union, specifies which 1905 /// field within the union will be initialized. 1906 FieldDecl *UnionFieldInit; 1907 1908 /// Whether this initializer list originally had a GNU array-range 1909 /// designator in it. This is a temporary marker used by CodeGen. 1910 bool HadArrayRangeDesignator; 1911 1912public: 1913 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1914 SourceLocation rbraceloc); 1915 1916 /// \brief Build an empty initializer list. 1917 explicit InitListExpr(EmptyShell Empty) : Expr(InitListExprClass, Empty) { } 1918 1919 unsigned getNumInits() const { return InitExprs.size(); } 1920 1921 const Expr* getInit(unsigned Init) const { 1922 assert(Init < getNumInits() && "Initializer access out of range!"); 1923 return cast_or_null<Expr>(InitExprs[Init]); 1924 } 1925 1926 Expr* getInit(unsigned Init) { 1927 assert(Init < getNumInits() && "Initializer access out of range!"); 1928 return cast_or_null<Expr>(InitExprs[Init]); 1929 } 1930 1931 void setInit(unsigned Init, Expr *expr) { 1932 assert(Init < getNumInits() && "Initializer access out of range!"); 1933 InitExprs[Init] = expr; 1934 } 1935 1936 /// \brief Reserve space for some number of initializers. 1937 void reserveInits(unsigned NumInits); 1938 1939 /// @brief Specify the number of initializers 1940 /// 1941 /// If there are more than @p NumInits initializers, the remaining 1942 /// initializers will be destroyed. If there are fewer than @p 1943 /// NumInits initializers, NULL expressions will be added for the 1944 /// unknown initializers. 1945 void resizeInits(ASTContext &Context, unsigned NumInits); 1946 1947 /// @brief Updates the initializer at index @p Init with the new 1948 /// expression @p expr, and returns the old expression at that 1949 /// location. 1950 /// 1951 /// When @p Init is out of range for this initializer list, the 1952 /// initializer list will be extended with NULL expressions to 1953 /// accomodate the new entry. 1954 Expr *updateInit(unsigned Init, Expr *expr); 1955 1956 /// \brief If this initializes a union, specifies which field in the 1957 /// union to initialize. 1958 /// 1959 /// Typically, this field is the first named field within the 1960 /// union. However, a designated initializer can specify the 1961 /// initialization of a different field within the union. 1962 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 1963 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 1964 1965 // Explicit InitListExpr's originate from source code (and have valid source 1966 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1967 bool isExplicit() { 1968 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1969 } 1970 1971 SourceLocation getLBraceLoc() const { return LBraceLoc; } 1972 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 1973 SourceLocation getRBraceLoc() const { return RBraceLoc; } 1974 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 1975 1976 /// @brief Retrieve the initializer list that describes the 1977 /// syntactic form of the initializer. 1978 /// 1979 /// 1980 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 1981 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 1982 1983 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 1984 void sawArrayRangeDesignator(bool ARD = true) { 1985 HadArrayRangeDesignator = ARD; 1986 } 1987 1988 virtual SourceRange getSourceRange() const { 1989 return SourceRange(LBraceLoc, RBraceLoc); 1990 } 1991 static bool classof(const Stmt *T) { 1992 return T->getStmtClass() == InitListExprClass; 1993 } 1994 static bool classof(const InitListExpr *) { return true; } 1995 1996 // Iterators 1997 virtual child_iterator child_begin(); 1998 virtual child_iterator child_end(); 1999 2000 typedef std::vector<Stmt *>::iterator iterator; 2001 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 2002 2003 iterator begin() { return InitExprs.begin(); } 2004 iterator end() { return InitExprs.end(); } 2005 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2006 reverse_iterator rend() { return InitExprs.rend(); } 2007}; 2008 2009/// @brief Represents a C99 designated initializer expression. 2010/// 2011/// A designated initializer expression (C99 6.7.8) contains one or 2012/// more designators (which can be field designators, array 2013/// designators, or GNU array-range designators) followed by an 2014/// expression that initializes the field or element(s) that the 2015/// designators refer to. For example, given: 2016/// 2017/// @code 2018/// struct point { 2019/// double x; 2020/// double y; 2021/// }; 2022/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2023/// @endcode 2024/// 2025/// The InitListExpr contains three DesignatedInitExprs, the first of 2026/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2027/// designators, one array designator for @c [2] followed by one field 2028/// designator for @c .y. The initalization expression will be 1.0. 2029class DesignatedInitExpr : public Expr { 2030public: 2031 /// \brief Forward declaration of the Designator class. 2032 class Designator; 2033 2034private: 2035 /// The location of the '=' or ':' prior to the actual initializer 2036 /// expression. 2037 SourceLocation EqualOrColonLoc; 2038 2039 /// Whether this designated initializer used the GNU deprecated 2040 /// syntax rather than the C99 '=' syntax. 2041 bool GNUSyntax : 1; 2042 2043 /// The number of designators in this initializer expression. 2044 unsigned NumDesignators : 15; 2045 2046 /// \brief The designators in this designated initialization 2047 /// expression. 2048 Designator *Designators; 2049 2050 /// The number of subexpressions of this initializer expression, 2051 /// which contains both the initializer and any additional 2052 /// expressions used by array and array-range designators. 2053 unsigned NumSubExprs : 16; 2054 2055 2056 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2057 const Designator *Designators, 2058 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2059 unsigned NumSubExprs); 2060 2061 explicit DesignatedInitExpr(unsigned NumSubExprs) 2062 : Expr(DesignatedInitExprClass, EmptyShell()), 2063 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2064 2065public: 2066 /// A field designator, e.g., ".x". 2067 struct FieldDesignator { 2068 /// Refers to the field that is being initialized. The low bit 2069 /// of this field determines whether this is actually a pointer 2070 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2071 /// initially constructed, a field designator will store an 2072 /// IdentifierInfo*. After semantic analysis has resolved that 2073 /// name, the field designator will instead store a FieldDecl*. 2074 uintptr_t NameOrField; 2075 2076 /// The location of the '.' in the designated initializer. 2077 unsigned DotLoc; 2078 2079 /// The location of the field name in the designated initializer. 2080 unsigned FieldLoc; 2081 }; 2082 2083 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2084 struct ArrayOrRangeDesignator { 2085 /// Location of the first index expression within the designated 2086 /// initializer expression's list of subexpressions. 2087 unsigned Index; 2088 /// The location of the '[' starting the array range designator. 2089 unsigned LBracketLoc; 2090 /// The location of the ellipsis separating the start and end 2091 /// indices. Only valid for GNU array-range designators. 2092 unsigned EllipsisLoc; 2093 /// The location of the ']' terminating the array range designator. 2094 unsigned RBracketLoc; 2095 }; 2096 2097 /// @brief Represents a single C99 designator. 2098 /// 2099 /// @todo This class is infuriatingly similar to clang::Designator, 2100 /// but minor differences (storing indices vs. storing pointers) 2101 /// keep us from reusing it. Try harder, later, to rectify these 2102 /// differences. 2103 class Designator { 2104 /// @brief The kind of designator this describes. 2105 enum { 2106 FieldDesignator, 2107 ArrayDesignator, 2108 ArrayRangeDesignator 2109 } Kind; 2110 2111 union { 2112 /// A field designator, e.g., ".x". 2113 struct FieldDesignator Field; 2114 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2115 struct ArrayOrRangeDesignator ArrayOrRange; 2116 }; 2117 friend class DesignatedInitExpr; 2118 2119 public: 2120 Designator() {} 2121 2122 /// @brief Initializes a field designator. 2123 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2124 SourceLocation FieldLoc) 2125 : Kind(FieldDesignator) { 2126 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2127 Field.DotLoc = DotLoc.getRawEncoding(); 2128 Field.FieldLoc = FieldLoc.getRawEncoding(); 2129 } 2130 2131 /// @brief Initializes an array designator. 2132 Designator(unsigned Index, SourceLocation LBracketLoc, 2133 SourceLocation RBracketLoc) 2134 : Kind(ArrayDesignator) { 2135 ArrayOrRange.Index = Index; 2136 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2137 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2138 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2139 } 2140 2141 /// @brief Initializes a GNU array-range designator. 2142 Designator(unsigned Index, SourceLocation LBracketLoc, 2143 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2144 : Kind(ArrayRangeDesignator) { 2145 ArrayOrRange.Index = Index; 2146 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2147 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2148 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2149 } 2150 2151 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2152 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2153 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2154 2155 IdentifierInfo * getFieldName(); 2156 2157 FieldDecl *getField() { 2158 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2159 if (Field.NameOrField & 0x01) 2160 return 0; 2161 else 2162 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2163 } 2164 2165 void setField(FieldDecl *FD) { 2166 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2167 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2168 } 2169 2170 SourceLocation getDotLoc() const { 2171 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2172 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2173 } 2174 2175 SourceLocation getFieldLoc() const { 2176 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2177 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2178 } 2179 2180 SourceLocation getLBracketLoc() const { 2181 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2182 "Only valid on an array or array-range designator"); 2183 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2184 } 2185 2186 SourceLocation getRBracketLoc() const { 2187 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2188 "Only valid on an array or array-range designator"); 2189 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2190 } 2191 2192 SourceLocation getEllipsisLoc() const { 2193 assert(Kind == ArrayRangeDesignator && 2194 "Only valid on an array-range designator"); 2195 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2196 } 2197 2198 unsigned getFirstExprIndex() const { 2199 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2200 "Only valid on an array or array-range designator"); 2201 return ArrayOrRange.Index; 2202 } 2203 2204 SourceLocation getStartLocation() const { 2205 if (Kind == FieldDesignator) 2206 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2207 else 2208 return getLBracketLoc(); 2209 } 2210 }; 2211 2212 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2213 unsigned NumDesignators, 2214 Expr **IndexExprs, unsigned NumIndexExprs, 2215 SourceLocation EqualOrColonLoc, 2216 bool GNUSyntax, Expr *Init); 2217 2218 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2219 2220 /// @brief Returns the number of designators in this initializer. 2221 unsigned size() const { return NumDesignators; } 2222 2223 // Iterator access to the designators. 2224 typedef Designator* designators_iterator; 2225 designators_iterator designators_begin() { return Designators; } 2226 designators_iterator designators_end() { 2227 return Designators + NumDesignators; 2228 } 2229 2230 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2231 2232 void setDesignators(const Designator *Desigs, unsigned NumDesigs); 2233 2234 Expr *getArrayIndex(const Designator& D); 2235 Expr *getArrayRangeStart(const Designator& D); 2236 Expr *getArrayRangeEnd(const Designator& D); 2237 2238 /// @brief Retrieve the location of the '=' that precedes the 2239 /// initializer value itself, if present. 2240 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2241 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2242 2243 /// @brief Determines whether this designated initializer used the 2244 /// deprecated GNU syntax for designated initializers. 2245 bool usesGNUSyntax() const { return GNUSyntax; } 2246 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2247 2248 /// @brief Retrieve the initializer value. 2249 Expr *getInit() const { 2250 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2251 } 2252 2253 void setInit(Expr *init) { 2254 *child_begin() = init; 2255 } 2256 2257 /// \brief Retrieve the total number of subexpressions in this 2258 /// designated initializer expression, including the actual 2259 /// initialized value and any expressions that occur within array 2260 /// and array-range designators. 2261 unsigned getNumSubExprs() const { return NumSubExprs; } 2262 2263 Expr *getSubExpr(unsigned Idx) { 2264 assert(Idx < NumSubExprs && "Subscript out of range"); 2265 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2266 Ptr += sizeof(DesignatedInitExpr); 2267 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2268 } 2269 2270 void setSubExpr(unsigned Idx, Expr *E) { 2271 assert(Idx < NumSubExprs && "Subscript out of range"); 2272 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2273 Ptr += sizeof(DesignatedInitExpr); 2274 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2275 } 2276 2277 /// \brief Replaces the designator at index @p Idx with the series 2278 /// of designators in [First, Last). 2279 void ExpandDesignator(unsigned Idx, const Designator *First, 2280 const Designator *Last); 2281 2282 virtual SourceRange getSourceRange() const; 2283 2284 virtual void Destroy(ASTContext &C); 2285 2286 static bool classof(const Stmt *T) { 2287 return T->getStmtClass() == DesignatedInitExprClass; 2288 } 2289 static bool classof(const DesignatedInitExpr *) { return true; } 2290 2291 // Iterators 2292 virtual child_iterator child_begin(); 2293 virtual child_iterator child_end(); 2294}; 2295 2296/// \brief Represents an implicitly-generated value initialization of 2297/// an object of a given type. 2298/// 2299/// Implicit value initializations occur within semantic initializer 2300/// list expressions (InitListExpr) as placeholders for subobject 2301/// initializations not explicitly specified by the user. 2302/// 2303/// \see InitListExpr 2304class ImplicitValueInitExpr : public Expr { 2305public: 2306 explicit ImplicitValueInitExpr(QualType ty) 2307 : Expr(ImplicitValueInitExprClass, ty) { } 2308 2309 /// \brief Construct an empty implicit value initialization. 2310 explicit ImplicitValueInitExpr(EmptyShell Empty) 2311 : Expr(ImplicitValueInitExprClass, Empty) { } 2312 2313 static bool classof(const Stmt *T) { 2314 return T->getStmtClass() == ImplicitValueInitExprClass; 2315 } 2316 static bool classof(const ImplicitValueInitExpr *) { return true; } 2317 2318 virtual SourceRange getSourceRange() const { 2319 return SourceRange(); 2320 } 2321 2322 // Iterators 2323 virtual child_iterator child_begin(); 2324 virtual child_iterator child_end(); 2325}; 2326 2327//===----------------------------------------------------------------------===// 2328// Clang Extensions 2329//===----------------------------------------------------------------------===// 2330 2331 2332/// ExtVectorElementExpr - This represents access to specific elements of a 2333/// vector, and may occur on the left hand side or right hand side. For example 2334/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2335/// 2336/// Note that the base may have either vector or pointer to vector type, just 2337/// like a struct field reference. 2338/// 2339class ExtVectorElementExpr : public Expr { 2340 Stmt *Base; 2341 IdentifierInfo *Accessor; 2342 SourceLocation AccessorLoc; 2343public: 2344 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2345 SourceLocation loc) 2346 : Expr(ExtVectorElementExprClass, ty), 2347 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 2348 2349 /// \brief Build an empty vector element expression. 2350 explicit ExtVectorElementExpr(EmptyShell Empty) 2351 : Expr(ExtVectorElementExprClass, Empty) { } 2352 2353 const Expr *getBase() const { return cast<Expr>(Base); } 2354 Expr *getBase() { return cast<Expr>(Base); } 2355 void setBase(Expr *E) { Base = E; } 2356 2357 IdentifierInfo &getAccessor() const { return *Accessor; } 2358 void setAccessor(IdentifierInfo *II) { Accessor = II; } 2359 2360 SourceLocation getAccessorLoc() const { return AccessorLoc; } 2361 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 2362 2363 /// getNumElements - Get the number of components being selected. 2364 unsigned getNumElements() const; 2365 2366 /// containsDuplicateElements - Return true if any element access is 2367 /// repeated. 2368 bool containsDuplicateElements() const; 2369 2370 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2371 /// aggregate Constant of ConstantInt(s). 2372 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2373 2374 virtual SourceRange getSourceRange() const { 2375 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2376 } 2377 2378 /// isArrow - Return true if the base expression is a pointer to vector, 2379 /// return false if the base expression is a vector. 2380 bool isArrow() const; 2381 2382 static bool classof(const Stmt *T) { 2383 return T->getStmtClass() == ExtVectorElementExprClass; 2384 } 2385 static bool classof(const ExtVectorElementExpr *) { return true; } 2386 2387 // Iterators 2388 virtual child_iterator child_begin(); 2389 virtual child_iterator child_end(); 2390}; 2391 2392 2393/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2394/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2395class BlockExpr : public Expr { 2396protected: 2397 BlockDecl *TheBlock; 2398 bool HasBlockDeclRefExprs; 2399public: 2400 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2401 : Expr(BlockExprClass, ty), 2402 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2403 2404 /// \brief Build an empty block expression. 2405 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 2406 2407 const BlockDecl *getBlockDecl() const { return TheBlock; } 2408 BlockDecl *getBlockDecl() { return TheBlock; } 2409 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 2410 2411 // Convenience functions for probing the underlying BlockDecl. 2412 SourceLocation getCaretLocation() const; 2413 const Stmt *getBody() const; 2414 Stmt *getBody(); 2415 2416 const Stmt *getBody(ASTContext &C) const { return getBody(); } 2417 Stmt *getBody(ASTContext &C) { return getBody(); } 2418 2419 virtual SourceRange getSourceRange() const { 2420 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2421 } 2422 2423 /// getFunctionType - Return the underlying function type for this block. 2424 const FunctionType *getFunctionType() const; 2425 2426 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2427 /// inside of the block that reference values outside the block. 2428 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2429 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 2430 2431 static bool classof(const Stmt *T) { 2432 return T->getStmtClass() == BlockExprClass; 2433 } 2434 static bool classof(const BlockExpr *) { return true; } 2435 2436 // Iterators 2437 virtual child_iterator child_begin(); 2438 virtual child_iterator child_end(); 2439}; 2440 2441/// BlockDeclRefExpr - A reference to a declared variable, function, 2442/// enum, etc. 2443class BlockDeclRefExpr : public Expr { 2444 ValueDecl *D; 2445 SourceLocation Loc; 2446 bool IsByRef; 2447public: 2448 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2449 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2450 2451 // \brief Build an empty reference to a declared variable in a 2452 // block. 2453 explicit BlockDeclRefExpr(EmptyShell Empty) 2454 : Expr(BlockDeclRefExprClass, Empty) { } 2455 2456 ValueDecl *getDecl() { return D; } 2457 const ValueDecl *getDecl() const { return D; } 2458 void setDecl(ValueDecl *VD) { D = VD; } 2459 2460 SourceLocation getLocation() const { return Loc; } 2461 void setLocation(SourceLocation L) { Loc = L; } 2462 2463 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2464 2465 bool isByRef() const { return IsByRef; } 2466 void setByRef(bool BR) { IsByRef = BR; } 2467 2468 static bool classof(const Stmt *T) { 2469 return T->getStmtClass() == BlockDeclRefExprClass; 2470 } 2471 static bool classof(const BlockDeclRefExpr *) { return true; } 2472 2473 // Iterators 2474 virtual child_iterator child_begin(); 2475 virtual child_iterator child_end(); 2476}; 2477 2478} // end namespace clang 2479 2480#endif 2481