Expr.h revision 0b7489194f9f89fac39d57211c1e7953ae50251f
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "llvm/ADT/APSInt.h" 21#include "llvm/ADT/APFloat.h" 22#include "llvm/ADT/SmallVector.h" 23#include <vector> 24 25namespace clang { 26 class ASTContext; 27 class APValue; 28 class Decl; 29 class IdentifierInfo; 30 class ParmVarDecl; 31 class NamedDecl; 32 class ValueDecl; 33 class BlockDecl; 34 class CXXOperatorCallExpr; 35 class CXXMemberCallExpr; 36 37/// Expr - This represents one expression. Note that Expr's are subclasses of 38/// Stmt. This allows an expression to be transparently used any place a Stmt 39/// is required. 40/// 41class Expr : public Stmt { 42 QualType TR; 43 44 /// TypeDependent - Whether this expression is type-dependent 45 /// (C++ [temp.dep.expr]). 46 bool TypeDependent : 1; 47 48 /// ValueDependent - Whether this expression is value-dependent 49 /// (C++ [temp.dep.constexpr]). 50 bool ValueDependent : 1; 51 52protected: 53 // FIXME: Eventually, this constructor should go away and we should 54 // require every subclass to provide type/value-dependence 55 // information. 56 Expr(StmtClass SC, QualType T) 57 : Stmt(SC), TypeDependent(false), ValueDependent(false) { 58 setType(T); 59 } 60 61 Expr(StmtClass SC, QualType T, bool TD, bool VD) 62 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 63 setType(T); 64 } 65 66 /// \brief Construct an empty expression. 67 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 68 69public: 70 QualType getType() const { return TR; } 71 void setType(QualType t) { 72 // In C++, the type of an expression is always adjusted so that it 73 // will not have reference type an expression will never have 74 // reference type (C++ [expr]p6). Use 75 // QualType::getNonReferenceType() to retrieve the non-reference 76 // type. Additionally, inspect Expr::isLvalue to determine whether 77 // an expression that is adjusted in this manner should be 78 // considered an lvalue. 79 assert((TR.isNull() || !TR->isReferenceType()) && 80 "Expressions can't have reference type"); 81 82 TR = t; 83 } 84 85 /// isValueDependent - Determines whether this expression is 86 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 87 /// array bound of "Chars" in the following example is 88 /// value-dependent. 89 /// @code 90 /// template<int Size, char (&Chars)[Size]> struct meta_string; 91 /// @endcode 92 bool isValueDependent() const { return ValueDependent; } 93 94 /// \brief Set whether this expression is value-dependent or not. 95 void setValueDependent(bool VD) { ValueDependent = VD; } 96 97 /// isTypeDependent - Determines whether this expression is 98 /// type-dependent (C++ [temp.dep.expr]), which means that its type 99 /// could change from one template instantiation to the next. For 100 /// example, the expressions "x" and "x + y" are type-dependent in 101 /// the following code, but "y" is not type-dependent: 102 /// @code 103 /// template<typename T> 104 /// void add(T x, int y) { 105 /// x + y; 106 /// } 107 /// @endcode 108 bool isTypeDependent() const { return TypeDependent; } 109 110 /// \brief Set whether this expression is type-dependent or not. 111 void setTypeDependent(bool TD) { TypeDependent = TD; } 112 113 /// SourceLocation tokens are not useful in isolation - they are low level 114 /// value objects created/interpreted by SourceManager. We assume AST 115 /// clients will have a pointer to the respective SourceManager. 116 virtual SourceRange getSourceRange() const = 0; 117 118 /// getExprLoc - Return the preferred location for the arrow when diagnosing 119 /// a problem with a generic expression. 120 virtual SourceLocation getExprLoc() const { return getLocStart(); } 121 122 /// isUnusedResultAWarning - Return true if this immediate expression should 123 /// be warned about if the result is unused. If so, fill in Loc and Ranges 124 /// with location to warn on and the source range[s] to report with the 125 /// warning. 126 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 127 SourceRange &R2) const; 128 129 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 130 /// incomplete type other than void. Nonarray expressions that can be lvalues: 131 /// - name, where name must be a variable 132 /// - e[i] 133 /// - (e), where e must be an lvalue 134 /// - e.name, where e must be an lvalue 135 /// - e->name 136 /// - *e, the type of e cannot be a function type 137 /// - string-constant 138 /// - reference type [C++ [expr]] 139 /// 140 enum isLvalueResult { 141 LV_Valid, 142 LV_NotObjectType, 143 LV_IncompleteVoidType, 144 LV_DuplicateVectorComponents, 145 LV_InvalidExpression, 146 LV_MemberFunction 147 }; 148 isLvalueResult isLvalue(ASTContext &Ctx) const; 149 150 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 151 /// does not have an incomplete type, does not have a const-qualified type, 152 /// and if it is a structure or union, does not have any member (including, 153 /// recursively, any member or element of all contained aggregates or unions) 154 /// with a const-qualified type. 155 enum isModifiableLvalueResult { 156 MLV_Valid, 157 MLV_NotObjectType, 158 MLV_IncompleteVoidType, 159 MLV_DuplicateVectorComponents, 160 MLV_InvalidExpression, 161 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 162 MLV_IncompleteType, 163 MLV_ConstQualified, 164 MLV_ArrayType, 165 MLV_NotBlockQualified, 166 MLV_ReadonlyProperty, 167 MLV_NoSetterProperty, 168 MLV_MemberFunction 169 }; 170 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx) const; 171 172 bool isBitField(); 173 174 /// getIntegerConstantExprValue() - Return the value of an integer 175 /// constant expression. The expression must be a valid integer 176 /// constant expression as determined by isIntegerConstantExpr. 177 llvm::APSInt getIntegerConstantExprValue(ASTContext &Ctx) const { 178 llvm::APSInt X; 179 bool success = isIntegerConstantExpr(X, Ctx); 180 success = success; 181 assert(success && "Illegal argument to getIntegerConstantExpr"); 182 return X; 183 } 184 185 /// isIntegerConstantExpr - Return true if this expression is a valid integer 186 /// constant expression, and, if so, return its value in Result. If not a 187 /// valid i-c-e, return false and fill in Loc (if specified) with the location 188 /// of the invalid expression. 189 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 190 SourceLocation *Loc = 0, 191 bool isEvaluated = true) const; 192 bool isIntegerConstantExprInternal(llvm::APSInt &Result, ASTContext &Ctx, 193 SourceLocation *Loc = 0, 194 bool isEvaluated = true) const; 195 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 196 llvm::APSInt X; 197 return isIntegerConstantExpr(X, Ctx, Loc); 198 } 199 /// isConstantInitializer - Returns true if this expression is a constant 200 /// initializer, which can be emitted at compile-time. 201 bool isConstantInitializer(ASTContext &Ctx) const; 202 203 /// EvalResult is a struct with detailed info about an evaluated expression. 204 struct EvalResult { 205 /// Val - This is the value the expression can be folded to. 206 APValue Val; 207 208 /// HasSideEffects - Whether the evaluated expression has side effects. 209 /// For example, (f() && 0) can be folded, but it still has side effects. 210 bool HasSideEffects; 211 212 /// Diag - If the expression is unfoldable, then Diag contains a note 213 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 214 /// position for the error, and DiagExpr is the expression that caused 215 /// the error. 216 /// If the expression is foldable, but not an integer constant expression, 217 /// Diag contains a note diagnostic that describes why it isn't an integer 218 /// constant expression. If the expression *is* an integer constant 219 /// expression, then Diag will be zero. 220 unsigned Diag; 221 const Expr *DiagExpr; 222 SourceLocation DiagLoc; 223 224 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 225 }; 226 227 /// Evaluate - Return true if this is a constant which we can fold using 228 /// any crazy technique (that has nothing to do with language standards) that 229 /// we want to. If this function returns true, it returns the folded constant 230 /// in Result. 231 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 232 233 /// isEvaluatable - Call Evaluate to see if this expression can be constant 234 /// folded, but discard the result. 235 bool isEvaluatable(ASTContext &Ctx) const; 236 237 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 238 /// must be called on an expression that constant folds to an integer. 239 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 240 241 /// EvaluateAsLValue - Evaluate an expression to see if it's a valid LValue. 242 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 243 244 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 245 /// integer constant expression with the value zero, or if this is one that is 246 /// cast to void*. 247 bool isNullPointerConstant(ASTContext &Ctx) const; 248 249 /// hasGlobalStorage - Return true if this expression has static storage 250 /// duration. This means that the address of this expression is a link-time 251 /// constant. 252 bool hasGlobalStorage() const; 253 254 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 255 /// write barrier. 256 bool isOBJCGCCandidate() const; 257 258 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 259 /// its subexpression. If that subexpression is also a ParenExpr, 260 /// then this method recursively returns its subexpression, and so forth. 261 /// Otherwise, the method returns the current Expr. 262 Expr* IgnoreParens(); 263 264 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 265 /// or CastExprs, returning their operand. 266 Expr *IgnoreParenCasts(); 267 268 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 269 /// value (including ptr->int casts of the same size). Strip off any 270 /// ParenExpr or CastExprs, returning their operand. 271 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 272 273 const Expr* IgnoreParens() const { 274 return const_cast<Expr*>(this)->IgnoreParens(); 275 } 276 const Expr *IgnoreParenCasts() const { 277 return const_cast<Expr*>(this)->IgnoreParenCasts(); 278 } 279 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 280 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 281 } 282 283 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 284 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 285 286 static bool classof(const Stmt *T) { 287 return T->getStmtClass() >= firstExprConstant && 288 T->getStmtClass() <= lastExprConstant; 289 } 290 static bool classof(const Expr *) { return true; } 291 292 static inline Expr* Create(llvm::Deserializer& D, ASTContext& C) { 293 return cast<Expr>(Stmt::Create(D, C)); 294 } 295}; 296 297 298//===----------------------------------------------------------------------===// 299// Primary Expressions. 300//===----------------------------------------------------------------------===// 301 302/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 303/// enum, etc. 304class DeclRefExpr : public Expr { 305 NamedDecl *D; 306 SourceLocation Loc; 307 308protected: 309 // FIXME: Eventually, this constructor will go away and all subclasses 310 // will have to provide the type- and value-dependent flags. 311 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 312 Expr(SC, t), D(d), Loc(l) {} 313 314 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 315 bool VD) : 316 Expr(SC, t, TD, VD), D(d), Loc(l) {} 317 318public: 319 // FIXME: Eventually, this constructor will go away and all clients 320 // will have to provide the type- and value-dependent flags. 321 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 322 Expr(DeclRefExprClass, t), D(d), Loc(l) {} 323 324 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 325 Expr(DeclRefExprClass, t, TD, VD), D(d), Loc(l) {} 326 327 /// \brief Construct an empty declaration reference expression. 328 explicit DeclRefExpr(EmptyShell Empty) 329 : Expr(DeclRefExprClass, Empty) { } 330 331 NamedDecl *getDecl() { return D; } 332 const NamedDecl *getDecl() const { return D; } 333 void setDecl(NamedDecl *NewD) { D = NewD; } 334 335 SourceLocation getLocation() const { return Loc; } 336 void setLocation(SourceLocation L) { Loc = L; } 337 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 338 339 static bool classof(const Stmt *T) { 340 return T->getStmtClass() == DeclRefExprClass || 341 T->getStmtClass() == CXXConditionDeclExprClass || 342 T->getStmtClass() == QualifiedDeclRefExprClass; 343 } 344 static bool classof(const DeclRefExpr *) { return true; } 345 346 // Iterators 347 virtual child_iterator child_begin(); 348 virtual child_iterator child_end(); 349 350 virtual void EmitImpl(llvm::Serializer& S) const; 351 static DeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 352}; 353 354/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 355class PredefinedExpr : public Expr { 356public: 357 enum IdentType { 358 Func, 359 Function, 360 PrettyFunction 361 }; 362 363private: 364 SourceLocation Loc; 365 IdentType Type; 366public: 367 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 368 : Expr(PredefinedExprClass, type), Loc(l), Type(IT) {} 369 370 IdentType getIdentType() const { return Type; } 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 virtual void EmitImpl(llvm::Serializer& S) const; 384 static PredefinedExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 385}; 386 387class IntegerLiteral : public Expr { 388 llvm::APInt Value; 389 SourceLocation Loc; 390public: 391 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 392 // or UnsignedLongLongTy 393 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 394 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 395 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 396 } 397 398 /// \brief Construct an empty integer literal. 399 explicit IntegerLiteral(EmptyShell Empty) 400 : Expr(IntegerLiteralClass, Empty) { } 401 402 IntegerLiteral* Clone(ASTContext &C) const; 403 404 const llvm::APInt &getValue() const { return Value; } 405 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 406 407 /// \brief Retrieve the location of the literal. 408 SourceLocation getLocation() const { return Loc; } 409 410 void setValue(const llvm::APInt &Val) { Value = Val; } 411 void setLocation(SourceLocation Location) { Loc = Location; } 412 413 static bool classof(const Stmt *T) { 414 return T->getStmtClass() == IntegerLiteralClass; 415 } 416 static bool classof(const IntegerLiteral *) { return true; } 417 418 // Iterators 419 virtual child_iterator child_begin(); 420 virtual child_iterator child_end(); 421 422 virtual void EmitImpl(llvm::Serializer& S) const; 423 static IntegerLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 424}; 425 426class CharacterLiteral : public Expr { 427 unsigned Value; 428 SourceLocation Loc; 429 bool IsWide; 430public: 431 // type should be IntTy 432 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 433 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 434 } 435 436 /// \brief Construct an empty character literal. 437 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 438 439 SourceLocation getLoc() const { return Loc; } 440 bool isWide() const { return IsWide; } 441 442 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 443 444 unsigned getValue() const { return Value; } 445 446 void setLocation(SourceLocation Location) { Loc = Location; } 447 void setWide(bool W) { IsWide = W; } 448 void setValue(unsigned Val) { Value = Val; } 449 450 static bool classof(const Stmt *T) { 451 return T->getStmtClass() == CharacterLiteralClass; 452 } 453 static bool classof(const CharacterLiteral *) { return true; } 454 455 // Iterators 456 virtual child_iterator child_begin(); 457 virtual child_iterator child_end(); 458 459 virtual void EmitImpl(llvm::Serializer& S) const; 460 static CharacterLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 461}; 462 463class FloatingLiteral : public Expr { 464 llvm::APFloat Value; 465 bool IsExact : 1; 466 SourceLocation Loc; 467public: 468 FloatingLiteral(const llvm::APFloat &V, bool* isexact, 469 QualType Type, SourceLocation L) 470 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(*isexact), Loc(L) {} 471 472 const llvm::APFloat &getValue() const { return Value; } 473 474 bool isExact() const { return IsExact; } 475 476 /// getValueAsApproximateDouble - This returns the value as an inaccurate 477 /// double. Note that this may cause loss of precision, but is useful for 478 /// debugging dumps, etc. 479 double getValueAsApproximateDouble() const; 480 481 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 482 483 static bool classof(const Stmt *T) { 484 return T->getStmtClass() == FloatingLiteralClass; 485 } 486 static bool classof(const FloatingLiteral *) { return true; } 487 488 // Iterators 489 virtual child_iterator child_begin(); 490 virtual child_iterator child_end(); 491 492 virtual void EmitImpl(llvm::Serializer& S) const; 493 static FloatingLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 494}; 495 496/// ImaginaryLiteral - We support imaginary integer and floating point literals, 497/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 498/// IntegerLiteral classes. Instances of this class always have a Complex type 499/// whose element type matches the subexpression. 500/// 501class ImaginaryLiteral : public Expr { 502 Stmt *Val; 503public: 504 ImaginaryLiteral(Expr *val, QualType Ty) 505 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 506 507 const Expr *getSubExpr() const { return cast<Expr>(Val); } 508 Expr *getSubExpr() { return cast<Expr>(Val); } 509 510 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 511 static bool classof(const Stmt *T) { 512 return T->getStmtClass() == ImaginaryLiteralClass; 513 } 514 static bool classof(const ImaginaryLiteral *) { return true; } 515 516 // Iterators 517 virtual child_iterator child_begin(); 518 virtual child_iterator child_end(); 519 520 virtual void EmitImpl(llvm::Serializer& S) const; 521 static ImaginaryLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 522}; 523 524/// StringLiteral - This represents a string literal expression, e.g. "foo" 525/// or L"bar" (wide strings). The actual string is returned by getStrData() 526/// is NOT null-terminated, and the length of the string is determined by 527/// calling getByteLength(). The C type for a string is always a 528/// ConstantArrayType. In C++, the char type is const qualified, in C it is 529/// not. 530/// 531/// Note that strings in C can be formed by concatenation of multiple string 532/// literal pptokens in translation phase #6. This keeps track of the locations 533/// of each of these pieces. 534/// 535/// Strings in C can also be truncated and extended by assigning into arrays, 536/// e.g. with constructs like: 537/// char X[2] = "foobar"; 538/// In this case, getByteLength() will return 6, but the string literal will 539/// have type "char[2]". 540class StringLiteral : public Expr { 541 const char *StrData; 542 unsigned ByteLength; 543 bool IsWide; 544 unsigned NumConcatenated; 545 SourceLocation TokLocs[1]; 546 547 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 548public: 549 /// This is the "fully general" constructor that allows representation of 550 /// strings formed from multiple concatenated tokens. 551 static StringLiteral *Create(ASTContext &C, const char *StrData, 552 unsigned ByteLength, bool Wide, QualType Ty, 553 const SourceLocation *Loc, unsigned NumStrs); 554 555 /// Simple constructor for string literals made from one token. 556 static StringLiteral *Create(ASTContext &C, const char *StrData, 557 unsigned ByteLength, 558 bool Wide, QualType Ty, SourceLocation Loc) { 559 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 560 } 561 562 StringLiteral* Clone(ASTContext &C) const; 563 void Destroy(ASTContext &C); 564 565 const char *getStrData() const { return StrData; } 566 unsigned getByteLength() const { return ByteLength; } 567 bool isWide() const { return IsWide; } 568 bool containsNonAsciiOrNull() const { 569 for (unsigned i = 0; i < getByteLength(); ++i) 570 if (!isascii(getStrData()[i]) || !getStrData()[i]) 571 return true; 572 return false; 573 } 574 /// getNumConcatenated - Get the number of string literal tokens that were 575 /// concatenated in translation phase #6 to form this string literal. 576 unsigned getNumConcatenated() const { return NumConcatenated; } 577 578 SourceLocation getStrTokenLoc(unsigned TokNum) const { 579 assert(TokNum < NumConcatenated && "Invalid tok number"); 580 return TokLocs[TokNum]; 581 } 582 583 typedef const SourceLocation *tokloc_iterator; 584 tokloc_iterator tokloc_begin() const { return TokLocs; } 585 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 586 587 virtual SourceRange getSourceRange() const { 588 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 589 } 590 static bool classof(const Stmt *T) { 591 return T->getStmtClass() == StringLiteralClass; 592 } 593 static bool classof(const StringLiteral *) { return true; } 594 595 // Iterators 596 virtual child_iterator child_begin(); 597 virtual child_iterator child_end(); 598 599 virtual void EmitImpl(llvm::Serializer& S) const; 600 static StringLiteral* CreateImpl(llvm::Deserializer& D, ASTContext& C); 601}; 602 603/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 604/// AST node is only formed if full location information is requested. 605class ParenExpr : public Expr { 606 SourceLocation L, R; 607 Stmt *Val; 608public: 609 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 610 : Expr(ParenExprClass, val->getType(), 611 val->isTypeDependent(), val->isValueDependent()), 612 L(l), R(r), Val(val) {} 613 614 const Expr *getSubExpr() const { return cast<Expr>(Val); } 615 Expr *getSubExpr() { return cast<Expr>(Val); } 616 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 617 618 /// \brief Get the location of the left parentheses '('. 619 SourceLocation getLParen() const { return L; } 620 621 /// \brief Get the location of the right parentheses ')'. 622 SourceLocation getRParen() const { return R; } 623 624 static bool classof(const Stmt *T) { 625 return T->getStmtClass() == ParenExprClass; 626 } 627 static bool classof(const ParenExpr *) { return true; } 628 629 // Iterators 630 virtual child_iterator child_begin(); 631 virtual child_iterator child_end(); 632 633 virtual void EmitImpl(llvm::Serializer& S) const; 634 static ParenExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 635}; 636 637 638/// UnaryOperator - This represents the unary-expression's (except sizeof and 639/// alignof), the postinc/postdec operators from postfix-expression, and various 640/// extensions. 641/// 642/// Notes on various nodes: 643/// 644/// Real/Imag - These return the real/imag part of a complex operand. If 645/// applied to a non-complex value, the former returns its operand and the 646/// later returns zero in the type of the operand. 647/// 648/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 649/// subexpression is a compound literal with the various MemberExpr and 650/// ArraySubscriptExpr's applied to it. 651/// 652class UnaryOperator : public Expr { 653public: 654 // Note that additions to this should also update the StmtVisitor class. 655 enum Opcode { 656 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 657 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 658 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 659 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 660 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 661 Real, Imag, // "__real expr"/"__imag expr" Extension. 662 Extension, // __extension__ marker. 663 OffsetOf // __builtin_offsetof 664 }; 665private: 666 Stmt *Val; 667 Opcode Opc; 668 SourceLocation Loc; 669public: 670 671 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 672 : Expr(UnaryOperatorClass, type, 673 input->isTypeDependent() && opc != OffsetOf, 674 input->isValueDependent()), 675 Val(input), Opc(opc), Loc(l) {} 676 677 Opcode getOpcode() const { return Opc; } 678 Expr *getSubExpr() const { return cast<Expr>(Val); } 679 680 /// getOperatorLoc - Return the location of the operator. 681 SourceLocation getOperatorLoc() const { return Loc; } 682 683 /// isPostfix - Return true if this is a postfix operation, like x++. 684 static bool isPostfix(Opcode Op) { 685 return Op == PostInc || Op == PostDec; 686 } 687 688 /// isPostfix - Return true if this is a prefix operation, like --x. 689 static bool isPrefix(Opcode Op) { 690 return Op == PreInc || Op == PreDec; 691 } 692 693 bool isPrefix() const { return isPrefix(Opc); } 694 bool isPostfix() const { return isPostfix(Opc); } 695 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 696 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 697 bool isOffsetOfOp() const { return Opc == OffsetOf; } 698 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 699 700 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 701 /// corresponds to, e.g. "sizeof" or "[pre]++" 702 static const char *getOpcodeStr(Opcode Op); 703 704 /// \brief Retrieve the unary opcode that corresponds to the given 705 /// overloaded operator. 706 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 707 708 /// \brief Retrieve the overloaded operator kind that corresponds to 709 /// the given unary opcode. 710 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 711 712 virtual SourceRange getSourceRange() const { 713 if (isPostfix()) 714 return SourceRange(Val->getLocStart(), Loc); 715 else 716 return SourceRange(Loc, Val->getLocEnd()); 717 } 718 virtual SourceLocation getExprLoc() const { return Loc; } 719 720 static bool classof(const Stmt *T) { 721 return T->getStmtClass() == UnaryOperatorClass; 722 } 723 static bool classof(const UnaryOperator *) { return true; } 724 725 // Iterators 726 virtual child_iterator child_begin(); 727 virtual child_iterator child_end(); 728 729 virtual void EmitImpl(llvm::Serializer& S) const; 730 static UnaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 731}; 732 733/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 734/// types and expressions. 735class SizeOfAlignOfExpr : public Expr { 736 bool isSizeof : 1; // true if sizeof, false if alignof. 737 bool isType : 1; // true if operand is a type, false if an expression 738 union { 739 void *Ty; 740 Stmt *Ex; 741 } Argument; 742 SourceLocation OpLoc, RParenLoc; 743public: 744 SizeOfAlignOfExpr(bool issizeof, QualType T, 745 QualType resultType, SourceLocation op, 746 SourceLocation rp) : 747 Expr(SizeOfAlignOfExprClass, resultType, 748 false, // Never type-dependent (C++ [temp.dep.expr]p3). 749 // Value-dependent if the argument is type-dependent. 750 T->isDependentType()), 751 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 752 Argument.Ty = T.getAsOpaquePtr(); 753 } 754 755 SizeOfAlignOfExpr(bool issizeof, Expr *E, 756 QualType resultType, SourceLocation op, 757 SourceLocation rp) : 758 Expr(SizeOfAlignOfExprClass, resultType, 759 false, // Never type-dependent (C++ [temp.dep.expr]p3). 760 // Value-dependent if the argument is type-dependent. 761 E->isTypeDependent()), 762 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 763 Argument.Ex = E; 764 } 765 766 virtual void Destroy(ASTContext& C); 767 768 bool isSizeOf() const { return isSizeof; } 769 bool isArgumentType() const { return isType; } 770 QualType getArgumentType() const { 771 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 772 return QualType::getFromOpaquePtr(Argument.Ty); 773 } 774 Expr *getArgumentExpr() { 775 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 776 return static_cast<Expr*>(Argument.Ex); 777 } 778 const Expr *getArgumentExpr() const { 779 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 780 } 781 782 /// Gets the argument type, or the type of the argument expression, whichever 783 /// is appropriate. 784 QualType getTypeOfArgument() const { 785 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 786 } 787 788 SourceLocation getOperatorLoc() const { return OpLoc; } 789 790 virtual SourceRange getSourceRange() const { 791 return SourceRange(OpLoc, RParenLoc); 792 } 793 794 static bool classof(const Stmt *T) { 795 return T->getStmtClass() == SizeOfAlignOfExprClass; 796 } 797 static bool classof(const SizeOfAlignOfExpr *) { return true; } 798 799 // Iterators 800 virtual child_iterator child_begin(); 801 virtual child_iterator child_end(); 802 803 virtual void EmitImpl(llvm::Serializer& S) const; 804 static SizeOfAlignOfExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 805}; 806 807//===----------------------------------------------------------------------===// 808// Postfix Operators. 809//===----------------------------------------------------------------------===// 810 811/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 812class ArraySubscriptExpr : public Expr { 813 enum { LHS, RHS, END_EXPR=2 }; 814 Stmt* SubExprs[END_EXPR]; 815 SourceLocation RBracketLoc; 816public: 817 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 818 SourceLocation rbracketloc) 819 : Expr(ArraySubscriptExprClass, t, 820 lhs->isTypeDependent() || rhs->isTypeDependent(), 821 lhs->isValueDependent() || rhs->isValueDependent()), 822 RBracketLoc(rbracketloc) { 823 SubExprs[LHS] = lhs; 824 SubExprs[RHS] = rhs; 825 } 826 827 /// An array access can be written A[4] or 4[A] (both are equivalent). 828 /// - getBase() and getIdx() always present the normalized view: A[4]. 829 /// In this case getBase() returns "A" and getIdx() returns "4". 830 /// - getLHS() and getRHS() present the syntactic view. e.g. for 831 /// 4[A] getLHS() returns "4". 832 /// Note: Because vector element access is also written A[4] we must 833 /// predicate the format conversion in getBase and getIdx only on the 834 /// the type of the RHS, as it is possible for the LHS to be a vector of 835 /// integer type 836 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 837 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 838 839 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 840 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 841 842 Expr *getBase() { 843 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 844 } 845 846 const Expr *getBase() const { 847 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 848 } 849 850 Expr *getIdx() { 851 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 852 } 853 854 const Expr *getIdx() const { 855 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 856 } 857 858 virtual SourceRange getSourceRange() const { 859 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 860 } 861 862 SourceLocation getRBracketLoc() const { return RBracketLoc; } 863 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 864 865 static bool classof(const Stmt *T) { 866 return T->getStmtClass() == ArraySubscriptExprClass; 867 } 868 static bool classof(const ArraySubscriptExpr *) { return true; } 869 870 // Iterators 871 virtual child_iterator child_begin(); 872 virtual child_iterator child_end(); 873 874 virtual void EmitImpl(llvm::Serializer& S) const; 875 static ArraySubscriptExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 876}; 877 878 879/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 880/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 881/// while its subclasses may represent alternative syntax that (semantically) 882/// results in a function call. For example, CXXOperatorCallExpr is 883/// a subclass for overloaded operator calls that use operator syntax, e.g., 884/// "str1 + str2" to resolve to a function call. 885class CallExpr : public Expr { 886 enum { FN=0, ARGS_START=1 }; 887 Stmt **SubExprs; 888 unsigned NumArgs; 889 SourceLocation RParenLoc; 890 891 // This version of the ctor is for deserialization. 892 CallExpr(StmtClass SC, Stmt** subexprs, unsigned numargs, QualType t, 893 SourceLocation rparenloc) 894 : Expr(SC,t), SubExprs(subexprs), 895 NumArgs(numargs), RParenLoc(rparenloc) {} 896 897protected: 898 // This version of the constructor is for derived classes. 899 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 900 QualType t, SourceLocation rparenloc); 901 902public: 903 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 904 SourceLocation rparenloc); 905 906 ~CallExpr() {} 907 908 void Destroy(ASTContext& C); 909 910 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 911 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 912 void setCallee(Expr *F) { SubExprs[FN] = F; } 913 914 /// getNumArgs - Return the number of actual arguments to this call. 915 /// 916 unsigned getNumArgs() const { return NumArgs; } 917 918 /// getArg - Return the specified argument. 919 Expr *getArg(unsigned Arg) { 920 assert(Arg < NumArgs && "Arg access out of range!"); 921 return cast<Expr>(SubExprs[Arg+ARGS_START]); 922 } 923 const Expr *getArg(unsigned Arg) const { 924 assert(Arg < NumArgs && "Arg access out of range!"); 925 return cast<Expr>(SubExprs[Arg+ARGS_START]); 926 } 927 928 // FIXME: Why is this needed? Why not just create the CallExpr with the 929 // corect number of arguments? It makes the ASTs less brittle. 930 /// setArg - Set the specified argument. 931 void setArg(unsigned Arg, Expr *ArgExpr) { 932 assert(Arg < NumArgs && "Arg access out of range!"); 933 SubExprs[Arg+ARGS_START] = ArgExpr; 934 } 935 936 // FIXME: It would be great to just get rid of this. There is only one 937 // callee of this method, and it probably could be refactored to not use 938 // this method and instead just create a CallExpr with the right number of 939 // arguments. 940 /// setNumArgs - This changes the number of arguments present in this call. 941 /// Any orphaned expressions are deleted by this, and any new operands are set 942 /// to null. 943 void setNumArgs(ASTContext& C, unsigned NumArgs); 944 945 typedef ExprIterator arg_iterator; 946 typedef ConstExprIterator const_arg_iterator; 947 948 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 949 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 950 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 951 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 952 953 /// getNumCommas - Return the number of commas that must have been present in 954 /// this function call. 955 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 956 957 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 958 /// not, return 0. 959 unsigned isBuiltinCall(ASTContext &Context) const; 960 961 SourceLocation getRParenLoc() const { return RParenLoc; } 962 963 virtual SourceRange getSourceRange() const { 964 return SourceRange(getCallee()->getLocStart(), RParenLoc); 965 } 966 967 static bool classof(const Stmt *T) { 968 return T->getStmtClass() == CallExprClass || 969 T->getStmtClass() == CXXOperatorCallExprClass || 970 T->getStmtClass() == CXXMemberCallExprClass; 971 } 972 static bool classof(const CallExpr *) { return true; } 973 static bool classof(const CXXOperatorCallExpr *) { return true; } 974 static bool classof(const CXXMemberCallExpr *) { return true; } 975 976 // Iterators 977 virtual child_iterator child_begin(); 978 virtual child_iterator child_end(); 979 980 virtual void EmitImpl(llvm::Serializer& S) const; 981 static CallExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C, 982 StmtClass SC); 983}; 984 985/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 986/// 987class MemberExpr : public Expr { 988 /// Base - the expression for the base pointer or structure references. In 989 /// X.F, this is "X". 990 Stmt *Base; 991 992 /// MemberDecl - This is the decl being referenced by the field/member name. 993 /// In X.F, this is the decl referenced by F. 994 NamedDecl *MemberDecl; 995 996 /// MemberLoc - This is the location of the member name. 997 SourceLocation MemberLoc; 998 999 /// IsArrow - True if this is "X->F", false if this is "X.F". 1000 bool IsArrow; 1001public: 1002 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1003 QualType ty) 1004 : Expr(MemberExprClass, ty), 1005 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow) {} 1006 1007 void setBase(Expr *E) { Base = E; } 1008 Expr *getBase() const { return cast<Expr>(Base); } 1009 1010 /// \brief Retrieve the member declaration to which this expression refers. 1011 /// 1012 /// The returned declaration will either be a FieldDecl or (in C++) 1013 /// a CXXMethodDecl. 1014 NamedDecl *getMemberDecl() const { return MemberDecl; } 1015 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1016 bool isArrow() const { return IsArrow; } 1017 1018 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1019 /// location of 'F'. 1020 SourceLocation getMemberLoc() const { return MemberLoc; } 1021 1022 virtual SourceRange getSourceRange() const { 1023 return SourceRange(getBase()->getLocStart(), MemberLoc); 1024 } 1025 1026 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1027 1028 static bool classof(const Stmt *T) { 1029 return T->getStmtClass() == MemberExprClass; 1030 } 1031 static bool classof(const MemberExpr *) { return true; } 1032 1033 // Iterators 1034 virtual child_iterator child_begin(); 1035 virtual child_iterator child_end(); 1036 1037 virtual void EmitImpl(llvm::Serializer& S) const; 1038 static MemberExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1039}; 1040 1041/// CompoundLiteralExpr - [C99 6.5.2.5] 1042/// 1043class CompoundLiteralExpr : public Expr { 1044 /// LParenLoc - If non-null, this is the location of the left paren in a 1045 /// compound literal like "(int){4}". This can be null if this is a 1046 /// synthesized compound expression. 1047 SourceLocation LParenLoc; 1048 Stmt *Init; 1049 bool FileScope; 1050public: 1051 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1052 bool fileScope) 1053 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1054 FileScope(fileScope) {} 1055 1056 const Expr *getInitializer() const { return cast<Expr>(Init); } 1057 Expr *getInitializer() { return cast<Expr>(Init); } 1058 1059 bool isFileScope() const { return FileScope; } 1060 1061 SourceLocation getLParenLoc() const { return LParenLoc; } 1062 1063 virtual SourceRange getSourceRange() const { 1064 // FIXME: Init should never be null. 1065 if (!Init) 1066 return SourceRange(); 1067 if (LParenLoc.isInvalid()) 1068 return Init->getSourceRange(); 1069 return SourceRange(LParenLoc, Init->getLocEnd()); 1070 } 1071 1072 static bool classof(const Stmt *T) { 1073 return T->getStmtClass() == CompoundLiteralExprClass; 1074 } 1075 static bool classof(const CompoundLiteralExpr *) { return true; } 1076 1077 // Iterators 1078 virtual child_iterator child_begin(); 1079 virtual child_iterator child_end(); 1080 1081 virtual void EmitImpl(llvm::Serializer& S) const; 1082 static CompoundLiteralExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1083}; 1084 1085/// CastExpr - Base class for type casts, including both implicit 1086/// casts (ImplicitCastExpr) and explicit casts that have some 1087/// representation in the source code (ExplicitCastExpr's derived 1088/// classes). 1089class CastExpr : public Expr { 1090 Stmt *Op; 1091protected: 1092 CastExpr(StmtClass SC, QualType ty, Expr *op) : 1093 Expr(SC, ty, 1094 // Cast expressions are type-dependent if the type is 1095 // dependent (C++ [temp.dep.expr]p3). 1096 ty->isDependentType(), 1097 // Cast expressions are value-dependent if the type is 1098 // dependent or if the subexpression is value-dependent. 1099 ty->isDependentType() || (op && op->isValueDependent())), 1100 Op(op) {} 1101 1102public: 1103 Expr *getSubExpr() { return cast<Expr>(Op); } 1104 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1105 1106 static bool classof(const Stmt *T) { 1107 StmtClass SC = T->getStmtClass(); 1108 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1109 return true; 1110 1111 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1112 return true; 1113 1114 return false; 1115 } 1116 static bool classof(const CastExpr *) { return true; } 1117 1118 // Iterators 1119 virtual child_iterator child_begin(); 1120 virtual child_iterator child_end(); 1121}; 1122 1123/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1124/// conversions, which have no direct representation in the original 1125/// source code. For example: converting T[]->T*, void f()->void 1126/// (*f)(), float->double, short->int, etc. 1127/// 1128/// In C, implicit casts always produce rvalues. However, in C++, an 1129/// implicit cast whose result is being bound to a reference will be 1130/// an lvalue. For example: 1131/// 1132/// @code 1133/// class Base { }; 1134/// class Derived : public Base { }; 1135/// void f(Derived d) { 1136/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1137/// } 1138/// @endcode 1139class ImplicitCastExpr : public CastExpr { 1140 /// LvalueCast - Whether this cast produces an lvalue. 1141 bool LvalueCast; 1142 1143public: 1144 ImplicitCastExpr(QualType ty, Expr *op, bool Lvalue) : 1145 CastExpr(ImplicitCastExprClass, ty, op), LvalueCast(Lvalue) { } 1146 1147 virtual SourceRange getSourceRange() const { 1148 return getSubExpr()->getSourceRange(); 1149 } 1150 1151 /// isLvalueCast - Whether this cast produces an lvalue. 1152 bool isLvalueCast() const { return LvalueCast; } 1153 1154 /// setLvalueCast - Set whether this cast produces an lvalue. 1155 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1156 1157 static bool classof(const Stmt *T) { 1158 return T->getStmtClass() == ImplicitCastExprClass; 1159 } 1160 static bool classof(const ImplicitCastExpr *) { return true; } 1161 1162 virtual void EmitImpl(llvm::Serializer& S) const; 1163 static ImplicitCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1164}; 1165 1166/// ExplicitCastExpr - An explicit cast written in the source 1167/// code. 1168/// 1169/// This class is effectively an abstract class, because it provides 1170/// the basic representation of an explicitly-written cast without 1171/// specifying which kind of cast (C cast, functional cast, static 1172/// cast, etc.) was written; specific derived classes represent the 1173/// particular style of cast and its location information. 1174/// 1175/// Unlike implicit casts, explicit cast nodes have two different 1176/// types: the type that was written into the source code, and the 1177/// actual type of the expression as determined by semantic 1178/// analysis. These types may differ slightly. For example, in C++ one 1179/// can cast to a reference type, which indicates that the resulting 1180/// expression will be an lvalue. The reference type, however, will 1181/// not be used as the type of the expression. 1182class ExplicitCastExpr : public CastExpr { 1183 /// TypeAsWritten - The type that this expression is casting to, as 1184 /// written in the source code. 1185 QualType TypeAsWritten; 1186 1187protected: 1188 ExplicitCastExpr(StmtClass SC, QualType exprTy, Expr *op, QualType writtenTy) 1189 : CastExpr(SC, exprTy, op), TypeAsWritten(writtenTy) {} 1190 1191public: 1192 /// getTypeAsWritten - Returns the type that this expression is 1193 /// casting to, as written in the source code. 1194 QualType getTypeAsWritten() const { return TypeAsWritten; } 1195 1196 static bool classof(const Stmt *T) { 1197 StmtClass SC = T->getStmtClass(); 1198 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1199 return true; 1200 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1201 return true; 1202 1203 return false; 1204 } 1205 static bool classof(const ExplicitCastExpr *) { return true; } 1206}; 1207 1208/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1209/// cast in C++ (C++ [expr.cast]), which uses the syntax 1210/// (Type)expr. For example: @c (int)f. 1211class CStyleCastExpr : public ExplicitCastExpr { 1212 SourceLocation LPLoc; // the location of the left paren 1213 SourceLocation RPLoc; // the location of the right paren 1214public: 1215 CStyleCastExpr(QualType exprTy, Expr *op, QualType writtenTy, 1216 SourceLocation l, SourceLocation r) : 1217 ExplicitCastExpr(CStyleCastExprClass, exprTy, op, writtenTy), 1218 LPLoc(l), RPLoc(r) {} 1219 1220 SourceLocation getLParenLoc() const { return LPLoc; } 1221 SourceLocation getRParenLoc() const { return RPLoc; } 1222 1223 virtual SourceRange getSourceRange() const { 1224 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1225 } 1226 static bool classof(const Stmt *T) { 1227 return T->getStmtClass() == CStyleCastExprClass; 1228 } 1229 static bool classof(const CStyleCastExpr *) { return true; } 1230 1231 virtual void EmitImpl(llvm::Serializer& S) const; 1232 static CStyleCastExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1233}; 1234 1235/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1236/// 1237/// This expression node kind describes a builtin binary operation, 1238/// such as "x + y" for integer values "x" and "y". The operands will 1239/// already have been converted to appropriate types (e.g., by 1240/// performing promotions or conversions). 1241/// 1242/// In C++, where operators may be overloaded, a different kind of 1243/// expression node (CXXOperatorCallExpr) is used to express the 1244/// invocation of an overloaded operator with operator syntax. Within 1245/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1246/// used to store an expression "x + y" depends on the subexpressions 1247/// for x and y. If neither x or y is type-dependent, and the "+" 1248/// operator resolves to a built-in operation, BinaryOperator will be 1249/// used to express the computation (x and y may still be 1250/// value-dependent). If either x or y is type-dependent, or if the 1251/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1252/// be used to express the computation. 1253class BinaryOperator : public Expr { 1254public: 1255 enum Opcode { 1256 // Operators listed in order of precedence. 1257 // Note that additions to this should also update the StmtVisitor class. 1258 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1259 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1260 Add, Sub, // [C99 6.5.6] Additive operators. 1261 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1262 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1263 EQ, NE, // [C99 6.5.9] Equality operators. 1264 And, // [C99 6.5.10] Bitwise AND operator. 1265 Xor, // [C99 6.5.11] Bitwise XOR operator. 1266 Or, // [C99 6.5.12] Bitwise OR operator. 1267 LAnd, // [C99 6.5.13] Logical AND operator. 1268 LOr, // [C99 6.5.14] Logical OR operator. 1269 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1270 DivAssign, RemAssign, 1271 AddAssign, SubAssign, 1272 ShlAssign, ShrAssign, 1273 AndAssign, XorAssign, 1274 OrAssign, 1275 Comma // [C99 6.5.17] Comma operator. 1276 }; 1277private: 1278 enum { LHS, RHS, END_EXPR }; 1279 Stmt* SubExprs[END_EXPR]; 1280 Opcode Opc; 1281 SourceLocation OpLoc; 1282public: 1283 1284 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1285 SourceLocation opLoc) 1286 : Expr(BinaryOperatorClass, ResTy, 1287 lhs->isTypeDependent() || rhs->isTypeDependent(), 1288 lhs->isValueDependent() || rhs->isValueDependent()), 1289 Opc(opc), OpLoc(opLoc) { 1290 SubExprs[LHS] = lhs; 1291 SubExprs[RHS] = rhs; 1292 assert(!isCompoundAssignmentOp() && 1293 "Use ArithAssignBinaryOperator for compound assignments"); 1294 } 1295 1296 SourceLocation getOperatorLoc() const { return OpLoc; } 1297 Opcode getOpcode() const { return Opc; } 1298 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1299 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1300 virtual SourceRange getSourceRange() const { 1301 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1302 } 1303 1304 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1305 /// corresponds to, e.g. "<<=". 1306 static const char *getOpcodeStr(Opcode Op); 1307 1308 /// \brief Retrieve the binary opcode that corresponds to the given 1309 /// overloaded operator. 1310 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1311 1312 /// \brief Retrieve the overloaded operator kind that corresponds to 1313 /// the given binary opcode. 1314 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1315 1316 /// predicates to categorize the respective opcodes. 1317 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1318 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1319 bool isShiftOp() const { return Opc == Shl || Opc == Shr; } 1320 bool isBitwiseOp() const { return Opc >= And && Opc <= Or; } 1321 1322 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1323 bool isRelationalOp() const { return isRelationalOp(Opc); } 1324 1325 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1326 bool isEqualityOp() const { return isEqualityOp(Opc); } 1327 1328 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1329 bool isLogicalOp() const { return isLogicalOp(Opc); } 1330 1331 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1332 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1333 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1334 1335 static bool classof(const Stmt *S) { 1336 return S->getStmtClass() == BinaryOperatorClass || 1337 S->getStmtClass() == CompoundAssignOperatorClass; 1338 } 1339 static bool classof(const BinaryOperator *) { return true; } 1340 1341 // Iterators 1342 virtual child_iterator child_begin(); 1343 virtual child_iterator child_end(); 1344 1345 virtual void EmitImpl(llvm::Serializer& S) const; 1346 static BinaryOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1347 1348protected: 1349 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1350 SourceLocation oploc, bool dead) 1351 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1352 SubExprs[LHS] = lhs; 1353 SubExprs[RHS] = rhs; 1354 } 1355}; 1356 1357/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1358/// track of the type the operation is performed in. Due to the semantics of 1359/// these operators, the operands are promoted, the aritmetic performed, an 1360/// implicit conversion back to the result type done, then the assignment takes 1361/// place. This captures the intermediate type which the computation is done 1362/// in. 1363class CompoundAssignOperator : public BinaryOperator { 1364 QualType ComputationLHSType; 1365 QualType ComputationResultType; 1366public: 1367 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1368 QualType ResType, QualType CompLHSType, 1369 QualType CompResultType, 1370 SourceLocation OpLoc) 1371 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1372 ComputationLHSType(CompLHSType), 1373 ComputationResultType(CompResultType) { 1374 assert(isCompoundAssignmentOp() && 1375 "Only should be used for compound assignments"); 1376 } 1377 1378 // The two computation types are the type the LHS is converted 1379 // to for the computation and the type of the result; the two are 1380 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1381 QualType getComputationLHSType() const { return ComputationLHSType; } 1382 QualType getComputationResultType() const { return ComputationResultType; } 1383 1384 static bool classof(const CompoundAssignOperator *) { return true; } 1385 static bool classof(const Stmt *S) { 1386 return S->getStmtClass() == CompoundAssignOperatorClass; 1387 } 1388 1389 virtual void EmitImpl(llvm::Serializer& S) const; 1390 static CompoundAssignOperator* CreateImpl(llvm::Deserializer& D, 1391 ASTContext& C); 1392}; 1393 1394/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1395/// GNU "missing LHS" extension is in use. 1396/// 1397class ConditionalOperator : public Expr { 1398 enum { COND, LHS, RHS, END_EXPR }; 1399 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1400public: 1401 ConditionalOperator(Expr *cond, Expr *lhs, Expr *rhs, QualType t) 1402 : Expr(ConditionalOperatorClass, t, 1403 // FIXME: the type of the conditional operator doesn't 1404 // depend on the type of the conditional, but the standard 1405 // seems to imply that it could. File a bug! 1406 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1407 (cond->isValueDependent() || 1408 (lhs && lhs->isValueDependent()) || 1409 (rhs && rhs->isValueDependent()))) { 1410 SubExprs[COND] = cond; 1411 SubExprs[LHS] = lhs; 1412 SubExprs[RHS] = rhs; 1413 } 1414 1415 // getCond - Return the expression representing the condition for 1416 // the ?: operator. 1417 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1418 1419 // getTrueExpr - Return the subexpression representing the value of the ?: 1420 // expression if the condition evaluates to true. In most cases this value 1421 // will be the same as getLHS() except a GCC extension allows the left 1422 // subexpression to be omitted, and instead of the condition be returned. 1423 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1424 // is only evaluated once. 1425 Expr *getTrueExpr() const { 1426 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1427 } 1428 1429 // getTrueExpr - Return the subexpression representing the value of the ?: 1430 // expression if the condition evaluates to false. This is the same as getRHS. 1431 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1432 1433 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1434 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1435 1436 virtual SourceRange getSourceRange() const { 1437 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1438 } 1439 static bool classof(const Stmt *T) { 1440 return T->getStmtClass() == ConditionalOperatorClass; 1441 } 1442 static bool classof(const ConditionalOperator *) { return true; } 1443 1444 // Iterators 1445 virtual child_iterator child_begin(); 1446 virtual child_iterator child_end(); 1447 1448 virtual void EmitImpl(llvm::Serializer& S) const; 1449 static ConditionalOperator* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1450}; 1451 1452/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1453class AddrLabelExpr : public Expr { 1454 SourceLocation AmpAmpLoc, LabelLoc; 1455 LabelStmt *Label; 1456public: 1457 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1458 QualType t) 1459 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1460 1461 virtual SourceRange getSourceRange() const { 1462 return SourceRange(AmpAmpLoc, LabelLoc); 1463 } 1464 1465 LabelStmt *getLabel() const { return Label; } 1466 1467 static bool classof(const Stmt *T) { 1468 return T->getStmtClass() == AddrLabelExprClass; 1469 } 1470 static bool classof(const AddrLabelExpr *) { return true; } 1471 1472 // Iterators 1473 virtual child_iterator child_begin(); 1474 virtual child_iterator child_end(); 1475 1476 virtual void EmitImpl(llvm::Serializer& S) const; 1477 static AddrLabelExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1478}; 1479 1480/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 1481/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 1482/// takes the value of the last subexpression. 1483class StmtExpr : public Expr { 1484 Stmt *SubStmt; 1485 SourceLocation LParenLoc, RParenLoc; 1486public: 1487 StmtExpr(CompoundStmt *substmt, QualType T, 1488 SourceLocation lp, SourceLocation rp) : 1489 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 1490 1491 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 1492 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 1493 1494 virtual SourceRange getSourceRange() const { 1495 return SourceRange(LParenLoc, RParenLoc); 1496 } 1497 1498 SourceLocation getLParenLoc() const { return LParenLoc; } 1499 SourceLocation getRParenLoc() const { return RParenLoc; } 1500 1501 static bool classof(const Stmt *T) { 1502 return T->getStmtClass() == StmtExprClass; 1503 } 1504 static bool classof(const StmtExpr *) { return true; } 1505 1506 // Iterators 1507 virtual child_iterator child_begin(); 1508 virtual child_iterator child_end(); 1509 1510 virtual void EmitImpl(llvm::Serializer& S) const; 1511 static StmtExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1512}; 1513 1514/// TypesCompatibleExpr - GNU builtin-in function __builtin_type_compatible_p. 1515/// This AST node represents a function that returns 1 if two *types* (not 1516/// expressions) are compatible. The result of this built-in function can be 1517/// used in integer constant expressions. 1518class TypesCompatibleExpr : public Expr { 1519 QualType Type1; 1520 QualType Type2; 1521 SourceLocation BuiltinLoc, RParenLoc; 1522public: 1523 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 1524 QualType t1, QualType t2, SourceLocation RP) : 1525 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 1526 BuiltinLoc(BLoc), RParenLoc(RP) {} 1527 1528 QualType getArgType1() const { return Type1; } 1529 QualType getArgType2() const { return Type2; } 1530 1531 virtual SourceRange getSourceRange() const { 1532 return SourceRange(BuiltinLoc, RParenLoc); 1533 } 1534 static bool classof(const Stmt *T) { 1535 return T->getStmtClass() == TypesCompatibleExprClass; 1536 } 1537 static bool classof(const TypesCompatibleExpr *) { return true; } 1538 1539 // Iterators 1540 virtual child_iterator child_begin(); 1541 virtual child_iterator child_end(); 1542 1543 virtual void EmitImpl(llvm::Serializer& S) const; 1544 static TypesCompatibleExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1545}; 1546 1547/// ShuffleVectorExpr - clang-specific builtin-in function 1548/// __builtin_shufflevector. 1549/// This AST node represents a operator that does a constant 1550/// shuffle, similar to LLVM's shufflevector instruction. It takes 1551/// two vectors and a variable number of constant indices, 1552/// and returns the appropriately shuffled vector. 1553class ShuffleVectorExpr : public Expr { 1554 SourceLocation BuiltinLoc, RParenLoc; 1555 1556 // SubExprs - the list of values passed to the __builtin_shufflevector 1557 // function. The first two are vectors, and the rest are constant 1558 // indices. The number of values in this list is always 1559 // 2+the number of indices in the vector type. 1560 Stmt **SubExprs; 1561 unsigned NumExprs; 1562 1563public: 1564 ShuffleVectorExpr(Expr **args, unsigned nexpr, 1565 QualType Type, SourceLocation BLoc, 1566 SourceLocation RP) : 1567 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 1568 RParenLoc(RP), NumExprs(nexpr) { 1569 1570 SubExprs = new Stmt*[nexpr]; 1571 for (unsigned i = 0; i < nexpr; i++) 1572 SubExprs[i] = args[i]; 1573 } 1574 1575 virtual SourceRange getSourceRange() const { 1576 return SourceRange(BuiltinLoc, RParenLoc); 1577 } 1578 static bool classof(const Stmt *T) { 1579 return T->getStmtClass() == ShuffleVectorExprClass; 1580 } 1581 static bool classof(const ShuffleVectorExpr *) { return true; } 1582 1583 ~ShuffleVectorExpr() { 1584 delete [] SubExprs; 1585 } 1586 1587 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 1588 /// constant expression, the actual arguments passed in, and the function 1589 /// pointers. 1590 unsigned getNumSubExprs() const { return NumExprs; } 1591 1592 /// getExpr - Return the Expr at the specified index. 1593 Expr *getExpr(unsigned Index) { 1594 assert((Index < NumExprs) && "Arg access out of range!"); 1595 return cast<Expr>(SubExprs[Index]); 1596 } 1597 const Expr *getExpr(unsigned Index) const { 1598 assert((Index < NumExprs) && "Arg access out of range!"); 1599 return cast<Expr>(SubExprs[Index]); 1600 } 1601 1602 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 1603 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 1604 return getExpr(N+2)->getIntegerConstantExprValue(Ctx).getZExtValue(); 1605 } 1606 1607 // Iterators 1608 virtual child_iterator child_begin(); 1609 virtual child_iterator child_end(); 1610 1611 virtual void EmitImpl(llvm::Serializer& S) const; 1612 static ShuffleVectorExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1613}; 1614 1615/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 1616/// This AST node is similar to the conditional operator (?:) in C, with 1617/// the following exceptions: 1618/// - the test expression must be a integer constant expression. 1619/// - the expression returned acts like the chosen subexpression in every 1620/// visible way: the type is the same as that of the chosen subexpression, 1621/// and all predicates (whether it's an l-value, whether it's an integer 1622/// constant expression, etc.) return the same result as for the chosen 1623/// sub-expression. 1624class ChooseExpr : public Expr { 1625 enum { COND, LHS, RHS, END_EXPR }; 1626 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1627 SourceLocation BuiltinLoc, RParenLoc; 1628public: 1629 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 1630 SourceLocation RP) 1631 : Expr(ChooseExprClass, t), 1632 BuiltinLoc(BLoc), RParenLoc(RP) { 1633 SubExprs[COND] = cond; 1634 SubExprs[LHS] = lhs; 1635 SubExprs[RHS] = rhs; 1636 } 1637 1638 /// isConditionTrue - Return whether the condition is true (i.e. not 1639 /// equal to zero). 1640 bool isConditionTrue(ASTContext &C) const; 1641 1642 /// getChosenSubExpr - Return the subexpression chosen according to the 1643 /// condition. 1644 Expr *getChosenSubExpr(ASTContext &C) const { 1645 return isConditionTrue(C) ? getLHS() : getRHS(); 1646 } 1647 1648 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1649 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1650 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1651 1652 virtual SourceRange getSourceRange() const { 1653 return SourceRange(BuiltinLoc, RParenLoc); 1654 } 1655 static bool classof(const Stmt *T) { 1656 return T->getStmtClass() == ChooseExprClass; 1657 } 1658 static bool classof(const ChooseExpr *) { return true; } 1659 1660 // Iterators 1661 virtual child_iterator child_begin(); 1662 virtual child_iterator child_end(); 1663 1664 virtual void EmitImpl(llvm::Serializer& S) const; 1665 static ChooseExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1666}; 1667 1668/// GNUNullExpr - Implements the GNU __null extension, which is a name 1669/// for a null pointer constant that has integral type (e.g., int or 1670/// long) and is the same size and alignment as a pointer. The __null 1671/// extension is typically only used by system headers, which define 1672/// NULL as __null in C++ rather than using 0 (which is an integer 1673/// that may not match the size of a pointer). 1674class GNUNullExpr : public Expr { 1675 /// TokenLoc - The location of the __null keyword. 1676 SourceLocation TokenLoc; 1677 1678public: 1679 GNUNullExpr(QualType Ty, SourceLocation Loc) 1680 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 1681 1682 /// getTokenLocation - The location of the __null token. 1683 SourceLocation getTokenLocation() const { return TokenLoc; } 1684 1685 virtual SourceRange getSourceRange() const { 1686 return SourceRange(TokenLoc); 1687 } 1688 static bool classof(const Stmt *T) { 1689 return T->getStmtClass() == GNUNullExprClass; 1690 } 1691 static bool classof(const GNUNullExpr *) { return true; } 1692 1693 // Iterators 1694 virtual child_iterator child_begin(); 1695 virtual child_iterator child_end(); 1696 1697 virtual void EmitImpl(llvm::Serializer& S) const; 1698 static GNUNullExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1699}; 1700 1701/// VAArgExpr, used for the builtin function __builtin_va_start. 1702class VAArgExpr : public Expr { 1703 Stmt *Val; 1704 SourceLocation BuiltinLoc, RParenLoc; 1705public: 1706 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 1707 : Expr(VAArgExprClass, t), 1708 Val(e), 1709 BuiltinLoc(BLoc), 1710 RParenLoc(RPLoc) { } 1711 1712 const Expr *getSubExpr() const { return cast<Expr>(Val); } 1713 Expr *getSubExpr() { return cast<Expr>(Val); } 1714 virtual SourceRange getSourceRange() const { 1715 return SourceRange(BuiltinLoc, RParenLoc); 1716 } 1717 static bool classof(const Stmt *T) { 1718 return T->getStmtClass() == VAArgExprClass; 1719 } 1720 static bool classof(const VAArgExpr *) { return true; } 1721 1722 // Iterators 1723 virtual child_iterator child_begin(); 1724 virtual child_iterator child_end(); 1725 1726 virtual void EmitImpl(llvm::Serializer& S) const; 1727 static VAArgExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1728}; 1729 1730/// @brief Describes an C or C++ initializer list. 1731/// 1732/// InitListExpr describes an initializer list, which can be used to 1733/// initialize objects of different types, including 1734/// struct/class/union types, arrays, and vectors. For example: 1735/// 1736/// @code 1737/// struct foo x = { 1, { 2, 3 } }; 1738/// @endcode 1739/// 1740/// Prior to semantic analysis, an initializer list will represent the 1741/// initializer list as written by the user, but will have the 1742/// placeholder type "void". This initializer list is called the 1743/// syntactic form of the initializer, and may contain C99 designated 1744/// initializers (represented as DesignatedInitExprs), initializations 1745/// of subobject members without explicit braces, and so on. Clients 1746/// interested in the original syntax of the initializer list should 1747/// use the syntactic form of the initializer list. 1748/// 1749/// After semantic analysis, the initializer list will represent the 1750/// semantic form of the initializer, where the initializations of all 1751/// subobjects are made explicit with nested InitListExpr nodes and 1752/// C99 designators have been eliminated by placing the designated 1753/// initializations into the subobject they initialize. Additionally, 1754/// any "holes" in the initialization, where no initializer has been 1755/// specified for a particular subobject, will be replaced with 1756/// implicitly-generated ImplicitValueInitExpr expressions that 1757/// value-initialize the subobjects. Note, however, that the 1758/// initializer lists may still have fewer initializers than there are 1759/// elements to initialize within the object. 1760/// 1761/// Given the semantic form of the initializer list, one can retrieve 1762/// the original syntactic form of that initializer list (if it 1763/// exists) using getSyntacticForm(). Since many initializer lists 1764/// have the same syntactic and semantic forms, getSyntacticForm() may 1765/// return NULL, indicating that the current initializer list also 1766/// serves as its syntactic form. 1767class InitListExpr : public Expr { 1768 std::vector<Stmt *> InitExprs; 1769 SourceLocation LBraceLoc, RBraceLoc; 1770 1771 /// Contains the initializer list that describes the syntactic form 1772 /// written in the source code. 1773 InitListExpr *SyntacticForm; 1774 1775 /// If this initializer list initializes a union, specifies which 1776 /// field within the union will be initialized. 1777 FieldDecl *UnionFieldInit; 1778 1779 /// Whether this initializer list originally had a GNU array-range 1780 /// designator in it. This is a temporary marker used by CodeGen. 1781 bool HadArrayRangeDesignator; 1782 1783public: 1784 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 1785 SourceLocation rbraceloc); 1786 1787 unsigned getNumInits() const { return InitExprs.size(); } 1788 1789 const Expr* getInit(unsigned Init) const { 1790 assert(Init < getNumInits() && "Initializer access out of range!"); 1791 return cast_or_null<Expr>(InitExprs[Init]); 1792 } 1793 1794 Expr* getInit(unsigned Init) { 1795 assert(Init < getNumInits() && "Initializer access out of range!"); 1796 return cast_or_null<Expr>(InitExprs[Init]); 1797 } 1798 1799 void setInit(unsigned Init, Expr *expr) { 1800 assert(Init < getNumInits() && "Initializer access out of range!"); 1801 InitExprs[Init] = expr; 1802 } 1803 1804 /// \brief Reserve space for some number of initializers. 1805 void reserveInits(unsigned NumInits); 1806 1807 /// @brief Specify the number of initializers 1808 /// 1809 /// If there are more than @p NumInits initializers, the remaining 1810 /// initializers will be destroyed. If there are fewer than @p 1811 /// NumInits initializers, NULL expressions will be added for the 1812 /// unknown initializers. 1813 void resizeInits(ASTContext &Context, unsigned NumInits); 1814 1815 /// @brief Updates the initializer at index @p Init with the new 1816 /// expression @p expr, and returns the old expression at that 1817 /// location. 1818 /// 1819 /// When @p Init is out of range for this initializer list, the 1820 /// initializer list will be extended with NULL expressions to 1821 /// accomodate the new entry. 1822 Expr *updateInit(unsigned Init, Expr *expr); 1823 1824 /// \brief If this initializes a union, specifies which field in the 1825 /// union to initialize. 1826 /// 1827 /// Typically, this field is the first named field within the 1828 /// union. However, a designated initializer can specify the 1829 /// initialization of a different field within the union. 1830 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 1831 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 1832 1833 // Explicit InitListExpr's originate from source code (and have valid source 1834 // locations). Implicit InitListExpr's are created by the semantic analyzer. 1835 bool isExplicit() { 1836 return LBraceLoc.isValid() && RBraceLoc.isValid(); 1837 } 1838 1839 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 1840 1841 /// @brief Retrieve the initializer list that describes the 1842 /// syntactic form of the initializer. 1843 /// 1844 /// 1845 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 1846 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 1847 1848 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 1849 void sawArrayRangeDesignator() { 1850 HadArrayRangeDesignator = true; 1851 } 1852 1853 virtual SourceRange getSourceRange() const { 1854 return SourceRange(LBraceLoc, RBraceLoc); 1855 } 1856 static bool classof(const Stmt *T) { 1857 return T->getStmtClass() == InitListExprClass; 1858 } 1859 static bool classof(const InitListExpr *) { return true; } 1860 1861 // Iterators 1862 virtual child_iterator child_begin(); 1863 virtual child_iterator child_end(); 1864 1865 typedef std::vector<Stmt *>::iterator iterator; 1866 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 1867 1868 iterator begin() { return InitExprs.begin(); } 1869 iterator end() { return InitExprs.end(); } 1870 reverse_iterator rbegin() { return InitExprs.rbegin(); } 1871 reverse_iterator rend() { return InitExprs.rend(); } 1872 1873 // Serailization. 1874 virtual void EmitImpl(llvm::Serializer& S) const; 1875 static InitListExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 1876 1877private: 1878 // Used by serializer. 1879 InitListExpr() : Expr(InitListExprClass, QualType()) {} 1880}; 1881 1882/// @brief Represents a C99 designated initializer expression. 1883/// 1884/// A designated initializer expression (C99 6.7.8) contains one or 1885/// more designators (which can be field designators, array 1886/// designators, or GNU array-range designators) followed by an 1887/// expression that initializes the field or element(s) that the 1888/// designators refer to. For example, given: 1889/// 1890/// @code 1891/// struct point { 1892/// double x; 1893/// double y; 1894/// }; 1895/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 1896/// @endcode 1897/// 1898/// The InitListExpr contains three DesignatedInitExprs, the first of 1899/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 1900/// designators, one array designator for @c [2] followed by one field 1901/// designator for @c .y. The initalization expression will be 1.0. 1902class DesignatedInitExpr : public Expr { 1903 /// The location of the '=' or ':' prior to the actual initializer 1904 /// expression. 1905 SourceLocation EqualOrColonLoc; 1906 1907 /// Whether this designated initializer used the GNU deprecated 1908 /// syntax rather than the C99 '=' syntax. 1909 bool GNUSyntax : 1; 1910 1911 /// The number of designators in this initializer expression. 1912 unsigned NumDesignators : 15; 1913 1914 /// The number of subexpressions of this initializer expression, 1915 /// which contains both the initializer and any additional 1916 /// expressions used by array and array-range designators. 1917 unsigned NumSubExprs : 16; 1918 1919 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 1920 SourceLocation EqualOrColonLoc, bool GNUSyntax, 1921 unsigned NumSubExprs) 1922 : Expr(DesignatedInitExprClass, Ty), 1923 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 1924 NumDesignators(NumDesignators), NumSubExprs(NumSubExprs) { } 1925 1926public: 1927 /// A field designator, e.g., ".x". 1928 struct FieldDesignator { 1929 /// Refers to the field that is being initialized. The low bit 1930 /// of this field determines whether this is actually a pointer 1931 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 1932 /// initially constructed, a field designator will store an 1933 /// IdentifierInfo*. After semantic analysis has resolved that 1934 /// name, the field designator will instead store a FieldDecl*. 1935 uintptr_t NameOrField; 1936 1937 /// The location of the '.' in the designated initializer. 1938 unsigned DotLoc; 1939 1940 /// The location of the field name in the designated initializer. 1941 unsigned FieldLoc; 1942 }; 1943 1944 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1945 struct ArrayOrRangeDesignator { 1946 /// Location of the first index expression within the designated 1947 /// initializer expression's list of subexpressions. 1948 unsigned Index; 1949 /// The location of the '[' starting the array range designator. 1950 unsigned LBracketLoc; 1951 /// The location of the ellipsis separating the start and end 1952 /// indices. Only valid for GNU array-range designators. 1953 unsigned EllipsisLoc; 1954 /// The location of the ']' terminating the array range designator. 1955 unsigned RBracketLoc; 1956 }; 1957 1958 /// @brief Represents a single C99 designator. 1959 /// 1960 /// @todo This class is infuriatingly similar to clang::Designator, 1961 /// but minor differences (storing indices vs. storing pointers) 1962 /// keep us from reusing it. Try harder, later, to rectify these 1963 /// differences. 1964 class Designator { 1965 /// @brief The kind of designator this describes. 1966 enum { 1967 FieldDesignator, 1968 ArrayDesignator, 1969 ArrayRangeDesignator 1970 } Kind; 1971 1972 union { 1973 /// A field designator, e.g., ".x". 1974 struct FieldDesignator Field; 1975 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 1976 struct ArrayOrRangeDesignator ArrayOrRange; 1977 }; 1978 friend class DesignatedInitExpr; 1979 1980 public: 1981 /// @brief Initializes a field designator. 1982 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 1983 SourceLocation FieldLoc) 1984 : Kind(FieldDesignator) { 1985 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 1986 Field.DotLoc = DotLoc.getRawEncoding(); 1987 Field.FieldLoc = FieldLoc.getRawEncoding(); 1988 } 1989 1990 /// @brief Initializes an array designator. 1991 Designator(unsigned Index, SourceLocation LBracketLoc, 1992 SourceLocation RBracketLoc) 1993 : Kind(ArrayDesignator) { 1994 ArrayOrRange.Index = Index; 1995 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 1996 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 1997 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 1998 } 1999 2000 /// @brief Initializes a GNU array-range designator. 2001 Designator(unsigned Index, SourceLocation LBracketLoc, 2002 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2003 : Kind(ArrayRangeDesignator) { 2004 ArrayOrRange.Index = Index; 2005 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2006 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2007 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2008 } 2009 2010 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2011 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2012 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2013 2014 IdentifierInfo * getFieldName(); 2015 2016 FieldDecl *getField() { 2017 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2018 if (Field.NameOrField & 0x01) 2019 return 0; 2020 else 2021 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2022 } 2023 2024 void setField(FieldDecl *FD) { 2025 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2026 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2027 } 2028 2029 SourceLocation getDotLoc() const { 2030 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2031 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2032 } 2033 2034 SourceLocation getFieldLoc() const { 2035 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2036 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2037 } 2038 2039 SourceLocation getLBracketLoc() const { 2040 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2041 "Only valid on an array or array-range designator"); 2042 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2043 } 2044 2045 SourceLocation getRBracketLoc() const { 2046 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2047 "Only valid on an array or array-range designator"); 2048 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2049 } 2050 2051 SourceLocation getEllipsisLoc() const { 2052 assert(Kind == ArrayRangeDesignator && 2053 "Only valid on an array-range designator"); 2054 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2055 } 2056 2057 SourceLocation getStartLocation() const { 2058 if (Kind == FieldDesignator) 2059 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2060 else 2061 return getLBracketLoc(); 2062 } 2063 }; 2064 2065 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2066 unsigned NumDesignators, 2067 Expr **IndexExprs, unsigned NumIndexExprs, 2068 SourceLocation EqualOrColonLoc, 2069 bool GNUSyntax, Expr *Init); 2070 2071 /// @brief Returns the number of designators in this initializer. 2072 unsigned size() const { return NumDesignators; } 2073 2074 // Iterator access to the designators. 2075 typedef Designator* designators_iterator; 2076 designators_iterator designators_begin(); 2077 designators_iterator designators_end(); 2078 2079 Expr *getArrayIndex(const Designator& D); 2080 Expr *getArrayRangeStart(const Designator& D); 2081 Expr *getArrayRangeEnd(const Designator& D); 2082 2083 /// @brief Retrieve the location of the '=' that precedes the 2084 /// initializer value itself, if present. 2085 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2086 2087 /// @brief Determines whether this designated initializer used the 2088 /// deprecated GNU syntax for designated initializers. 2089 bool usesGNUSyntax() const { return GNUSyntax; } 2090 2091 /// @brief Retrieve the initializer value. 2092 Expr *getInit() const { 2093 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2094 } 2095 2096 void setInit(Expr *init) { 2097 *child_begin() = init; 2098 } 2099 2100 virtual SourceRange getSourceRange() const; 2101 2102 static bool classof(const Stmt *T) { 2103 return T->getStmtClass() == DesignatedInitExprClass; 2104 } 2105 static bool classof(const DesignatedInitExpr *) { return true; } 2106 2107 // Iterators 2108 virtual child_iterator child_begin(); 2109 virtual child_iterator child_end(); 2110}; 2111 2112/// \brief Represents an implicitly-generated value initialization of 2113/// an object of a given type. 2114/// 2115/// Implicit value initializations occur within semantic initializer 2116/// list expressions (InitListExpr) as placeholders for subobject 2117/// initializations not explicitly specified by the user. 2118/// 2119/// \see InitListExpr 2120class ImplicitValueInitExpr : public Expr { 2121public: 2122 explicit ImplicitValueInitExpr(QualType ty) 2123 : Expr(ImplicitValueInitExprClass, ty) { } 2124 2125 static bool classof(const Stmt *T) { 2126 return T->getStmtClass() == ImplicitValueInitExprClass; 2127 } 2128 static bool classof(const ImplicitValueInitExpr *) { return true; } 2129 2130 virtual SourceRange getSourceRange() const { 2131 return SourceRange(); 2132 } 2133 2134 // Iterators 2135 virtual child_iterator child_begin(); 2136 virtual child_iterator child_end(); 2137}; 2138 2139//===----------------------------------------------------------------------===// 2140// Clang Extensions 2141//===----------------------------------------------------------------------===// 2142 2143 2144/// ExtVectorElementExpr - This represents access to specific elements of a 2145/// vector, and may occur on the left hand side or right hand side. For example 2146/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2147/// 2148/// Note that the base may have either vector or pointer to vector type, just 2149/// like a struct field reference. 2150/// 2151class ExtVectorElementExpr : public Expr { 2152 Stmt *Base; 2153 IdentifierInfo &Accessor; 2154 SourceLocation AccessorLoc; 2155public: 2156 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2157 SourceLocation loc) 2158 : Expr(ExtVectorElementExprClass, ty), 2159 Base(base), Accessor(accessor), AccessorLoc(loc) {} 2160 2161 const Expr *getBase() const { return cast<Expr>(Base); } 2162 Expr *getBase() { return cast<Expr>(Base); } 2163 2164 IdentifierInfo &getAccessor() const { return Accessor; } 2165 2166 /// getNumElements - Get the number of components being selected. 2167 unsigned getNumElements() const; 2168 2169 /// containsDuplicateElements - Return true if any element access is 2170 /// repeated. 2171 bool containsDuplicateElements() const; 2172 2173 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2174 /// aggregate Constant of ConstantInt(s). 2175 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2176 2177 virtual SourceRange getSourceRange() const { 2178 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2179 } 2180 2181 /// isArrow - Return true if the base expression is a pointer to vector, 2182 /// return false if the base expression is a vector. 2183 bool isArrow() const; 2184 2185 static bool classof(const Stmt *T) { 2186 return T->getStmtClass() == ExtVectorElementExprClass; 2187 } 2188 static bool classof(const ExtVectorElementExpr *) { return true; } 2189 2190 // Iterators 2191 virtual child_iterator child_begin(); 2192 virtual child_iterator child_end(); 2193 2194 virtual void EmitImpl(llvm::Serializer& S) const; 2195 static ExtVectorElementExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2196}; 2197 2198 2199/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2200/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2201class BlockExpr : public Expr { 2202protected: 2203 BlockDecl *TheBlock; 2204 bool HasBlockDeclRefExprs; 2205public: 2206 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2207 : Expr(BlockExprClass, ty), 2208 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2209 2210 const BlockDecl *getBlockDecl() const { return TheBlock; } 2211 BlockDecl *getBlockDecl() { return TheBlock; } 2212 2213 // Convenience functions for probing the underlying BlockDecl. 2214 SourceLocation getCaretLocation() const; 2215 const Stmt *getBody() const; 2216 Stmt *getBody(); 2217 2218 virtual SourceRange getSourceRange() const { 2219 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2220 } 2221 2222 /// getFunctionType - Return the underlying function type for this block. 2223 const FunctionType *getFunctionType() const; 2224 2225 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2226 /// contained inside. 2227 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2228 2229 static bool classof(const Stmt *T) { 2230 return T->getStmtClass() == BlockExprClass; 2231 } 2232 static bool classof(const BlockExpr *) { return true; } 2233 2234 // Iterators 2235 virtual child_iterator child_begin(); 2236 virtual child_iterator child_end(); 2237 2238 virtual void EmitImpl(llvm::Serializer& S) const; 2239 static BlockExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2240}; 2241 2242/// BlockDeclRefExpr - A reference to a declared variable, function, 2243/// enum, etc. 2244class BlockDeclRefExpr : public Expr { 2245 ValueDecl *D; 2246 SourceLocation Loc; 2247 bool IsByRef; 2248public: 2249 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef) : 2250 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef) {} 2251 2252 ValueDecl *getDecl() { return D; } 2253 const ValueDecl *getDecl() const { return D; } 2254 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2255 2256 bool isByRef() const { return IsByRef; } 2257 2258 static bool classof(const Stmt *T) { 2259 return T->getStmtClass() == BlockDeclRefExprClass; 2260 } 2261 static bool classof(const BlockDeclRefExpr *) { return true; } 2262 2263 // Iterators 2264 virtual child_iterator child_begin(); 2265 virtual child_iterator child_end(); 2266 2267 virtual void EmitImpl(llvm::Serializer& S) const; 2268 static BlockDeclRefExpr* CreateImpl(llvm::Deserializer& D, ASTContext& C); 2269}; 2270 2271} // end namespace clang 2272 2273#endif 2274